Up to date heavy-duty equipment cabs come equipped with full color, touch screen displays showing a variety of gages and indicator icons. OEMs are shifting technology from the traditional instrument panels with a plastic frame and housing and several gages and indicator lights to easy to use and interpret display screens that are helping to increase equipment productivity. Like all technologies, there are many factors that drive change.Cost drives change
Dial gages have many components to make them work; overlays, needles, stepper motors, etc. These components and the subsequent labor required to assemble have driven up the cost for traditional dial gages. Meanwhile, the cost of a good resolution, full color LCD display has come down in price. Displays have relatively few components and generally require less labor to assemble than a series of dial gages, making them an attractive alternative to traditional dial gage clusters.Improved customization for operators
To customize a dial gage, several components usually need to be modified, which typically results in an additional cost for customization and production support. A single base part number display screen is freely programmable and can be customized with software to show many gages or icons on screen. Having more than one screen, allows more information to be made available to the operator.
And, the display can be customized to show details only when the operator needs it or requests it. For example, the DEF tank level on a diesel engine doesn’t need to display its level on a continuous basis. However, if the fluid level is low, the operator should be alerted and the gage showing the level of the fluid in the tank can appear on the screen. This “instant on” capability of virtual gages allows a vast number of possible of gages and indictor icons to be shown.
With dial gages, when an operator preferred to view the data in a specified language, a new dial gage overlay was used. But, now with digital displays, the language and the units for the gages and indicators can also be more easily customized.OEMs can customize too
Original equipment manufacturers can customize the screens, gages, logos and colors for certain OEMs. And, this is managed in the display’s software. So, there is only the need for one part number for the hardware, only one part number needs to be inventoried, maintained and procured. This helps OEMs manage the indirect costs of handling multiple variants of similar parts, while still providing a custom look and feel to their customers.
As the shift towards freely programmable displays continues, more OEMs will adopt screens, in place of dial gages. Not only will this help drive down costs and increase operator productivity, but it will also offer OEMs the ability to add value to their customers through custom virtual dashboards. In order to help OEMs, respond to this shift in technology, Parker has launched new line of PHD displays designed for mobile equipment that offer up to date features, capabilities and ease of programming at a competitive price point.
Visit www.parker.com/phd to learn more.
Article contributed by Kirk Lola, product manager, Electronic Controls Division, Parker Hannifin Corporation.
Gold Cup - IE will help your Gold Cup pumps and motors work harder, smarter, and longer.
For example, Gold Cup - IE's predictive analytics can shorten downtime by enabling:
With six decades of experience and hard-earned know-how, Bob Brooks is an expert in residential and commercial site preparation. He began operating equipment at just 14 years old and for the past 40 years he has owned his own business. He has customers throughout the Puget Sound and keeps his calendar full through strictly word-of-mouth promotions. Over the course of his 60-year career, he has utilized a wide variety of attachments — and nothing he has used compares to Parker’s Helac PowerGrip® Multi-Purpose Jaw Bucket in regards to productivity.
At current fuel prices, saving 1/2 gallon per hour adds up to more than $2,000 saved every 1,000 machine hours. Their transportation costs of moving machines between job sites have also decreased by shaving 12,000 pounds off of B and B Excavating’s payload.
PowerGrip outperforms the competition
Brooks is admittedly tough on his PowerGrip. The sites he clears in the lush Pacific Northwest climate are full of fast-growing evergreen trees, glacial till and more. B and B Excavating previously used cylinder-style jaw buckets and found that they were frequently damaging cylinder-rods and plates when working in rocky soil or digging out concrete foundations. Brooks also disliked the cylinder-style jaw bucket's wasted space in the bucket — with the mounting cross tube on the jaw frequently in his way. With PowerGrip, all the moving parts are fully-enclosed and there are no obstructions in the bucket shell.
While using a thumb combination he grew frustrated by the weight penalty at the end of the boom. B and B Excavating also suffered from inefficiencies like having to take the time to get the bucket under a stump and then pinning the stump with the thumb before working it out of the ground. When grabbing material with PowerGrip, Brooks could just drop down on the object with an open jaw, close the jaw and remove the object. ‘‘PowerGrip offers more control over picking and placing material than anything I have used," said Brooks.
Brooks also values PowerGrip’s ability to seamlessly switch between tasks on the job site. "The PowerGrip really impressed me with its versatility. One minute I am moving heavy boulders or taking down a tree — the very next minute I am grabbing and loading old brittle concrete without breaking it,” explained Brooks.
A powerful and durable solution
PowerGrip is equipped with a durable, enclosed rotary actuator hinge that's ideally suited for the toughest conditions. Parker’s Helac rotary actuator hinge technology offers 120 degrees of smooth jaw movement and constant clamping force. The jaw rotation is generated by the massive rotating pivot point between the jaw and back of bucket that’s designed with the Helac sliding-spline operating technology, which converts linear piston motion into powerful shaft rotation. The end caps, seals and bearings work in unison to keep debris and contaminants out of the inner workings of the actuator, prolonging life and reducing required maintenance. High strength, abrasion resistant steel is used throughout for added durability.
PowerGrip buckets are available for equipment between the 4-20 tons class, with bucket width ranges from 24 inches to 48 inches in the trenching and excavating profiles and 48 inches or 60 inches in ditching and grading profiles.
The PowerGrip really impressed me with its versatility. One minute I am moving heavy boulders or taking down a tree — the very next minute I am grabbing and loading old brittle concrete without breaking it,” according to Brooks. “I’ve used a lot of different hydraulic thumbs and cylinder-style jaw buckets in the past, but to me, nothing on the market compares to the versatility and productivity of the PowerGripl/Multi-Purpose Jaw Bucket.
-Bob Brooks, owner, B & B Excavating
Download the brochure for more information on PowerGrip.
This article was contributed by Jessica Howisey, marketing communications manager, Helac Business Unit, Cylinder Division
Cylinders can fail for a number of reasons from wrong specifications to operator error. However, in this day and age with a number of engineering tools available to help reduce spec errors and strong expertise within the fluid power industry, one of the leading causes of cylinder failure is still seals. Whether, the seals are sized wrong, incorrect material is spec’d, or just installed wrong, error in sealing can have a major effect on the entire cylinder operation.
Cylinder operation is based on precise fluid pressure to both sides of the piston. If a seal breaks down and allows fluid to leak from one side of the piston to the other or out of the cylinder all together, the pressures change, and your cylinder will no longer operate as intended. With over 100 years in the fluid power industry, Parker engineers have seen countless examples of how seal issues can escalate into much larger problems for a hydraulic system.
Seal issues tend to fall into three main categories: hardening, bad installation and erosion.Hardening
Seal hardening is exactly what it sounds like. The seal can solidify and dry out making it hard and brittle. The most common reason for this is exposure to temperatures that are too high for the seal to handle. Be warned this is not just ambient temperature around the cylinder. The piston itself can generate substantial heat through motion and friction causing wear to the seal. This heat can be monitored by measuring the temperature of the hydraulic fluid entering and exiting the cylinder. There are several methods to combat hardening including insulation and cooling, but the best way is to use materials that are suited for the temperature requirements for your application. Parker offers a number of high-temperature class seals to ensure you meet the heat requirements of your job.Bad installation
While cylinder operation may seem simple on its surface, it takes precise installation of several parts to ensure that the cylinder will operate correctly for its entire life cycle. The seals are an integral part of this and if they are misaligned it can allow for hydraulic fluid leak past the seals. This can cause problems in cylinder operation that can lead to major failures that will result in costly downtime for your operation. Not only can Parker provide cylinders with the proper seals properly installed, we also offer universal seal kits to help ensure ease of installation on replacements, and our applications engineers have years of expertise to help when these installations get tricky.Erosion
Erosion can occur from three main sources. One cause is the general wear from the normal back and forth motion of the cylinder. This source unfortunately is unavoidable but can be prolonged thanks to the developments of Parker's Engineered Materials Group. The Engineered Materials Group develops and manufactures innovative sealing solutions to meet the challenges of today's vastly changing industries. Parker provides a wide range of specialty elastomers to satisfy unique sealing requirements with a combination of experience, innovation and support.
Another source of erosion is pressure build up. If the seal used in a cylinder is not specified to the appropriate pressure, pressure can get trapped underneath the seal and push it against the cylinder body causing wear.
Recently, Parker cylinder engineers identified an issue of a piston seal getting blow by and causing the cylinder to drift in a hydraulic press application. They were able to identify that the seal thickness was varied from about 1/32” under to almost 1/16” under print dimensions and that there was a slight amount of extrusion on the side of the seal facing towards the cap end of the cylinder. These would indicate higher pressure on the rod end of the cylinder that was getting trapped underneath the seal and pushing it against the cylinder body causing wear. Parker recommended switching from the KP piston seal to the HP that is made of polyurethane, a tougher material, with reliefs molded into the sides of the seal to allow venting excess pressure underneath. This helped the customer identify an issue early that could have grown into a much bigger problem.
Parker HP polyurethane piston seal
The Parker HP energized bi-directional piston seal improves upon the low friction and long wear of lipseals by including excellent low pressure sealing performance. Specially formulated polyurethane is long-wearing and abrasion-resistant with running friction comparable to lipseals. An o-ring energizer ensures virtually zero leakage in low-pressure applications. Also, pressure trapping that can result in energized lipseals is not possible with a single energized seal.
Parker’s HP piston seal is an excellent choice for most industrial applications operating with mineral based hydraulic oil and is available in Seal Classes 1 and 4.
Parker KP Filled PTEE piston seal
The Parker WP Mixed Media seal is designed for applications requiring different media on either side of the piston. This option is ideal when hydraulic oil is on one side of the piston and air is on the opposite side; and it can be equally effective when dissimilar fluids are on either side of the piston.
Superior low-friction bi-directional sealing is accomplished by combining an energized filled PTFE seal with a redundant elastomer seal. Energizer and redundant elastomer seal materials are available
for compatibility with seal classes 1, 2, 3, 5 and 6. Note: WP piston seal groove is not universal in 1.50" bore.
The final main source of erosion is use with an incompatible fluid. Hydraulic systems use a relatively incompressible fluid, and given the application environment, different types of hydraulic fluids may be required. For example, use of synthetic hydraulic fluid may be used for highly flammable applications. That is why you must keep in mind that not every seal will work with every application. If your job calls for a particular type of hydraulic fluid, customers should evaluate the seal material and compatibility to the fluid to ensure they have a seal that will withstand the chemical properties of that fluid. Parker offers seven classes of seals that are designed to work with standard hydraulic fluids to some that are highly corrosive.
Check out the Parker Sealing Technology Bulletin for more information on the wide variety of actuation sealing options Parker can provide. This bulletin shows how Parker seals provide unmatched leak protection on all industrial hydraulic and pneumatic cylinders. It gives ample information to help choose the right seal for your application. Download it now for all your sealing needs.
This article was contributed by Ryan Roberts, market specialist, Parker Hannifin's Cylinder Division.
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Maintaining a normal oil temperature in all hydraulic systems is important for successful system operation. Normal operating temperatures for hydraulic systems is 110 to 130° F (unless specified by the equipment manufacturer). At high temperatures, oxidation of the oil is accelerated. This oxidation shortens the fluid’s useful life by producing acids and sludge, which corrode metal parts. These acids and sludge clog valve orifices and cause rapid deterioration of moving components. The chemical properties of many hydraulic fluids can change dramatically by repeated heating/cooling cycles to extreme temperatures. This change or breakdown of the hydraulic media can be extremely detrimental to hydraulic components, especially pumping equipment.Coolers extend the service life
Overheated hydraulics can be caused by decomposing fluid, wear, or damaged seals and bearings. Coolers can prevent overheating and extend the service life of your hydraulic system. However, smaller hydraulic systems with lower operating temperatures can often be cooled through natural convection. If natural convection is not enough, it becomes necessary to add a cooler.
Coolers are also crucial for systems with temperature requirements such as needing to stabilize the hydraulic fluid’s viscosity by keeping it at a specific temperature, or equipment with a history of hot oil problems that shortened seal life and break down the fluid. Hot fluid is always a concern with large mobile equipment, as well as commercial and industrial processing equipment. Specifying a properly sized cooler saves time, money and maintenance.
Selecting the best cooler
The process to select a cooler is driven by the type of system that needs to be cooled. Parameters to consider include heat load, power source, noise, operating costs, space available, environmental conditions, and more.
Actual heat generation varies throughout the machine’s cycles, as well as changing environmental factors and ambient temperatures. This can make it challenging to accurately define your cooling needs. When considering the application and sizing of coolers, the hydraulic fluid’s ideal operating temperature and the time it takes to arrive at that temperature must be used.
For new designs and retrofits, the first step in selecting the right cooler is identifying the challenges and performing the necessary calculations. Virtual design and sizing tools are available from most manufacturers to help determine the best fit for your application. Some companies provide online sizing calculators and other interactive resources that let engineers plug in specifications to get an idea of what is needed. Parker offers a comprehensive suite of online cooler sizing software. For instance, Parker offers an online cooler selector tool for each of the different types of coolers including brazed plate, shell and tube and air-oil coolers.Air-oil coolers
To select the best air-oil coolers, you’ll need as much information about the application as possible, including, but not limited to the following:
If the required heat dissipation is not known, it can be estimated assuming 20-30 percent of the installed horsepower will be converted into heat load. The most accurate way to calculate the heat load is to record the time it takes the oil to get up to temperature without a cooler in the system.Water-oil coolers
For water-oil coolers, which include Parker’s ST and OAW series coolers, you also need to know the inlet temperature and flow rate of the cooling water. Most manufacturers’ literature includes examples, steps and simplified equations to properly size coolers. For instance, Parker provides engineering specifications for their ST series water-oil coolers, such as cooling capacity, flow rate, working pressure, sizing, and connection thread in their online tools to enhance the specifying process. Once the heat-load parameters and other key influencing factors are defined, the next step is choosing an air-oil (air-cooled) or water-oil (water-cooled) cooler.
How air-oil coolers work
Air-oil coolers remove heat from the oil in a cooler by using the ambient air around the cooler. Air-oil coolers convect heat, which makes them ideal when no water source is available or when the preference is to remove heat from the oil by using ambient air. In air-oil coolers, hot oil passes through channels that contain turbulators to prevent laminar flow from developing in an effort to promote heat transfer from the fluid to the channel wall. The channel wall is always constructed of metals with high thermal conductivities.
The cores of air-oil coolers are constructed in two different styles: tube-and-fin or bar-and-plate construction. Tube-and-fin construction consists of round or oval tubes mechanically connected to an array of external fins. The tube-and-fin design is lightweight and offers low pressure drop across the core. The tubes in a tube-and-fin design can be susceptible to damage from pressure spikes and external debris that can be encountered in any application. Bar-and-plate construction uses compact and efficient cores that offer more cooling per cubic-inch than a tube-and-fin design. They consist of finned chambers separated by flat plates which route fluids through alternating hot and cold passages. The bar-and-plate design creates a honeycomb structure that resists vibrations and shocks. This core is usually made of aluminum and is furnace brazed in a controlled atmosphere or high vacuum. With all the bar-and-plate design characteristics that provide certain benefits over the tube-and-fin design, it can be seen that bar-and-plate coolers can offer design engineers greater system design flexibility.
Both types of air-oil coolers typically have a fan driven by a hydraulic or electric motor. Off-road or mobile equipment used in construction, forestry, or material handling typically use either a hydraulic-driven or DC electric-driven fan motors. Industrial equipment such as Hydraulic Power Units (HPU) use AC electric-driven motors to drive the fans. Cooler manufacturers offer a lot of motor configurations, voltages, and displacements to fit various applications. For instance, Parker offers a variety of air-oil coolers with AC, DC, hydraulic fluid, and engine driven fans.
Cooler manufacturers offer a lot of motor configurations, voltages and displacements to fit various applications. For instance, Parker offers a variety of air-oil coolers with AC, DC, hydraulic fluid and engine driven fans. Parker’s two most popular air-oil coolers are the ULDC Series (DC fan motor) and the ULAC Series (AC fan motor).
How water-oil coolers work – shell and tube design
Water-oil coolers remove heat from oil by using a second fluid (typically water). For more than 50 years, shell-and-tube oil coolers have been an industry mainstay when considering water-oil coolers. However, newer designs have been developed that increase efficiency while providing an equivalent heat-transfer surface in a smaller package at a reduced cost.
Shell-and-tube (bare tube) coolers have an outer flanged shell with end bonnets appropriately sealed to each shell end. Inside, a precise pattern of tubing runs the length of the shell and terminates in the endplates. Tube ends are fastened to the endplates, which seal each end of the shell. Cool water flows through the tubes while hot oil flows around the tubes within the shell. The tubes run through several baffle plates that provide structural rigidity and create a maze through which the hot fluid must traverse. This maze created by the baffles lengthens the path the hot oil must flow through. This elongated path increases the amount of heat transfer from the hot fluid to the water by forcing the hot fluid to travel around the tubes for a longer period of time.
As mentioned above, there are shell-and-tube designs in the market now that mechanically add fins to the external surface area of the internal tubes, which increases heat transfer and efficiency. Parker does offer this type of high-efficiency “hybrid” design in the ST Cooler Series. The way the hybrid design works is that the fins add surface area and improve heat transfer, letting the overall size be smaller than standard shell-and-tube exchangers without fins on the tubes (bare-tube). However, due to the increased time the hot fluid has to traverse the interior of the cooler, the pressure drop can be higher than shell-and-tube coolers without the increased flow path created by the baffles.
How water-oil coolers work – brazed plate design
Another type of water-oil cooler is the brazed-plate style. In this cooler design, heat-transfer surfaces are a series of stainless-steel plates, each stamped with a corrugated pattern for strength, efficiency, and resistance to fouling by creating turbulence in the flow of both fluids. The number and design of the plates varies depending on the desired heat-transfer capacity.
Plates are stacked with thin sheets of copper or nickel between each plate. The plate pack, endplates, and connections are then brazed in a vacuum furnace to join the plates at the edges and all contact points. This design can be used with several different types of inlet and outlet connections.
Brazed-plate coolers are compact, rugged and provide high-heat transfer capacities. They hold approximately one-eighth of the liquid volume of a thermally comparable shell-and-tube cooler. Their stainless-steel construction permits flow velocities up to 20 feet per second. Higher velocities, combined with turbulent flow, provide heat transfer at three to five times the rate of shell-and-tube coolers. A good example of the increased horsepower is Parker’s OAW Series that offers up to 275 horsepower of cooling at an entering temperature difference of 60°F, based on a 2:1 water flow. The higher heat transfer rate requires less heat-transferring surface area for a given capacity.
Due to their compact construction, brazed-plate coolers are ideal when space and size are design requirements. One drawback of using a brazed plate cooler is that there can be higher pressure drops when compared to an equivalent shell-and-tube design. In addition, tests prove brazed-plate designs handle particles up to 1-mm in diameter without issue. Filters or strainers should be used if larger particles will be encountered. Due to their construction, brazed-plate coolers require chemical, rather than mechanical, cleaning.
ROI of coolers
When properly specifying the right cooler into a hydraulic system, a system will maintain the correct working temperature, which yields numerous economic and environmental benefits, including:
Given the many variables involved when specifying coolers, it is always best to directly contact a cooler supplier such as Parker, with any questions you have. Manufacturers will have additional resources that you can use in the selection process, including specialized sizing software and testing equipment like wind tunnels and cooler design simulation software. Lastly, it is important to take advantage of and rely on your manufacturer’s expertise and available resources to ensure you successfully size and implement the best cooler for your application. To view Parker’s wide range of coolers, visit www.parker.com/ACD.
This article was contributed by Francis C. Gradisher Jr., product marketing manager - KleenVent & Coolers, Parker Hannifin's Accumulator and Cooler Division.
How to Specify the Proper Sized Heat Exchanger for Your Hydraulic System
The WSYWIG environment helps reduce development time by showing the developer how the screens and menus look and feel during the development process, reducing the number of design iterations.
Having no hardware in the loop during screen development not only reduces the complexity of application development, but also reduces the time for each design iteration by significantly reducing the hardware download cycle in each design iteration.
Exporting the screens and menu operation to IoS, Windows or Android devices speed up the design review process by allowing a remote stakeholder to view the screen menus and operation with having any hardware or a development license.
The included image library and the ability to easily import graphic image files helps reduce development time by allowing screen designers to focus on developing the application instead of creating graphics.
K&B Lumber, a one-stop shop for logging and millwork was in search of a more energy-efficient sawmill that produced higher quality lumber for furniture than a typical sawmill. For most conventional sawmills, the log moves back and forth past the saw and cuts in only one direction. As a result, the operator’s view of the log can be obstructed when it is on the far side of the saw, which can affect lumber quality.
K&B Lumber’s goal was to develop a sawmill that utilized a moving saw, which cuts lumber in both directions and provides the operator visibility to the log while it is being cut. These two features increase the production of high-quality lumber over a traditional sawmill.
K&B Lumber collaborated with Mill Innovations & Design (MID), an original equipment manufacturer of sawmill equipment, to build a sawmill featuring a 6-foot Double Cut HeadRig that was energy efficient and capable of producing furniture grade lumber.
The new HeadRig consisted of a 12” wide band saw with teeth on both edges running on 6’ diameter wheels requiring 250 horsepower (HP). The challenge was finding enough real estate to fit a 25O HP motor on a moving saw.
A second challenge was finding a carriage drive that could accurately control the 30,000 pound saw with a high number of direction changes, 4000+ in an eight hour period.
Due to the sawmill’s space restrictions with the moving saw carriage, K&B Lumber and Mill Innovations Design chose closed-circuit hydraulics over an electric system to power the equipment.
With a hydraulic system planned, K&B Lumber and MID worked with Parker Hydraulic Pump and Power Systems (HPS) and a Parker distributor to select high-performance hydraulic components to power the sawmill’s saw and carriage drive.
For the saw’s power source, a Parker Gold Cup P14S Pump was selected, driving a Gold Cup M20R Motor stacked with a Parker F12 Series Bent Axis Motor on the back. This powerful combination allowed for additional system displacement.Result
Using the Gold Cup hydrostat to power the saw, provided the sawmill’s operator the ability to change speeds on the fly, which is critical for cutting different wood species efficiently.
An additional benefit of the saw’s Gold Cup system was a smooth, controlled stop while shutting down the saw voluntarily or in an emergency stop situation.
In terms of the 30,000 pound carriage drive, each direction change means decelerating and accelerating the load in a controlled manner. According to LeRoy Kuhns of K&B Lumber, the Parker F12 Series Motor on the carriage drive has close to a million direction changes and still continues to run flawlessly.
Overall, K&B Lumber has benefited by a smaller, safer sawmill. The new sawmill has also resulted in more efficient energy usage, while producing more output.
In the near future, K&B Lumber plans to enhance their hydraulic system by adding Parker’s Gold Cup - IE (Intelligence Enabled). Gold Cup - IE will monitor their Gold Cup pump to obtain longer service life, and help reduce downtime and service costs with actionable, real-time insights.
Article contributed by Dave Ebert, product manager, Parker's Hydraulic Pump and Power Systems (HPS).Related Articles
Power Take-Offs (PTOs) provide truck versatility beyond the usual function of providing transportation for materials. Power is directed from the engine to the auxiliary equipment to perform the work. With many applications for PTOs, there are many different PTO designs being developed - each design for its specific application of use. This creates many categories to assist in your search for the right PTO. Below are some of the main filtering search categories and tools that can be used to ensure the correct PTO is chosen for each application.Mounting type on transmissions
The variety of transmissions being used in the market today leads to multiple mounting types available for PTOs. The different mounting types can be designed around clearance concerns and assembly arrangements with the specific transmission application.Aperture:
Depending on the transmission being the PTO is being applied to, there could be a couple of apertures from which to choose. The aperture is the opening on either side of the transmission which permits installation of a PTO. They can be standard or non-standard depending on the transmission manufacturer.Number of bolts:
The number of bolts required to mount the PTO to the transmission is one way to classify the PTO. At Parker Chelsea, we have 6-Bolt, 8-Bolt, and 10-Bolt PTO designs.Mounting option:
We also have rear mount, Ford, reversable and split shaft PTOs. Each one is a category that can be searched in our products tab (parker.com/Chelsea). For the difference of the split shaft PTOs themselves, it is important to note that they are attached within the vehicle’s drivetrain, behind the transmission, and they require special mounting to the chassis frame.
When looking for the right PTO, you must know the make of your transmission. It is an easy and effective way to narrow down your search results quickly. At Parker Chelsea, we use an application guide that allows you to conduct a search based on the transmission manufacturer. From there, you will find a list of transmissions that will lead to pages that show the available PTOs. In our products tab (parker.com/Chelsea), there is a filter in place to search based on the transmission manufacturer.Shift type
Chelsea PTOs can be sorted by shift type by using the category filter in the products tab (parker.com/Chelsea). The options in this filter are constant mesh, hydraulic, lever, pneumatic and wire and cable. Constant mesh applies to applications that always require live power and are engaged as long as the engine is running. All others have the ability to be engaged and disengaged.
Example of how to classify and find a PTO
For an example of a product series to display how a PTO can be categorized in many ways, let’s use Parker Chelsea’s 280 Series PTO. The 280 Series PTO can be found on Allison and other transmission manufacturers. It is a 10-Bolt, hydraulically-shifted PTO. If you are unsure of the information initially, you can visit the product page to learn more about the PTO series. With this information, you would be able to find the PTO series in a product search based on the mounting type under 10-Bolt. For shift type, it would fall into the hydraulic filter. Both of those search results can be filtered down on parker.com/Chelsea.What else Is good to know when determining your PTO selection?
The driven equipment being used is an important aspect of your PTO selection. While classifying PTO search categories can help narrow down search results, the driven equipment as well will need to be considered when making your final decision. Some helpful information to find the right final product includes the type of driven equipment, the input horsepower required for the driven equipment and the operating speed of the driven equipment. The quick reference guide online provides what information is helpful to know.Materials to help you find the right PTO
You can find different support materials on the website to help learn more about the PTO options available for your application as well as more in-depth information of the PTOs themselves. The products tab, as mentioned, will have the different product category filters to narrow down your PTO search. On the homepage, you can find a competitor interchange tool. if you know of a competitor’s product, and you want to find the Parker Chelsea equivalent, you can learn more on the product page and find similar PTOs of Parker Chelsea. Other support materials to assist in your search can be found on the homepage as well as the support tab: brochures, catalogs, part lists and more.Links to find additional information
This article was contributed by Michael Mabrouk, marketing leadership associate, Chelsea Products Division, Parker Hannifin Corporation.
Properly applied hydraulic cylinders provide outstanding linear-actuation performance in a wide variety of applications. But if applied improperly, a cylinder in short order may not only ruin itself but also the equipment on which it is installed.Mounting Styles
There are fundamentally three categories of mounting styles. Both fixed and pivot styles can absorb forces on the cylinder’s centerline and typically include medium- and heavy-duty mounts for accommodating thrust or tension. The third category of fixed styles allows the entire cylinder to be supported by the mounting surface below cylinder centerline, rather than absorbing forces only along the centerline.
There are several available standardized mounts within these categories. Engineers can use this variety of mount offerings for an ever-widening number of application requirements. NFPA Tie rod cylinders, which are used in the majority of industrial systems, typically can be mounted using a variety of standard mating configurations from trunnion-style heads and caps to extended tie rod cap and/or head end styles, flange-style heads, side-lug and side-tapped styles, a range of spherical bearing configurations, and cap fixed clevis designs. Most of these mounting options are available for both single-acting and double rod cylinders.
The goal of every mounting design is to allow the mount to absorb force, stabilizing the system and optimizing performance. For rods loaded primarily in compression (push), cap end mounts are recommended; for those in tension (pull), a head end mount is preferred.
It is the amount of tension or compression that determines piston rod diameter; it is the amount of pull or push that determines the bore diameter. Other relevant factors to consider when selecting a mounting style include:
• Cylinder motion (straight/ fixed or pivot)
Every mounting type comes with its own benefits and limitations. For example, trunnions for pivot-mounted cylinders are incompatible with self-aligning bearings where the small bearing area is positioned at a distance from the trunnions and cylinder heads. Improper use of such a configuration introduces bending forces that can overstress the trunnion pins.
Many performance expectations that at first appear to require atypical mounts can be accommodated by existing styles, sometimes with only slight modifications, facilitating replacement and reducing costs.
One key is to focus on factors that impact cylinder performance. These include the cylinder’s size and force relative to load, the working environment, mounting hardware, and options that prevent wear and improve efficiency. Manufacturers, such as Parker, generally categorize cylinders by the type of action and physical construction. They usually group linear action into these three categories, which directly impacts the mounting options:
Select the mounting style based on the cylinder’s size, force and function. All these factors are necessary because the wrong mounting or improper installation can side load the rod, which creates excessive wear on the piston, piston rod, rod bearing, and seals. With wear comes leakage, and that is how cylinders fail.
Regardless of how well a hydraulic cylinder is designed and manufactured, it can fail if not mounted correctly. Proper mounting avoids problems like side loads that cause excessive seal and bearing wear, or even bend the rod or bind the load.
Contact the Parker’s Cylinder Division or visit www.parker.com/cyl if you have questions regarding which mounting style is right for your application.
Article contributed by Jim Hauser, senior engineer, Parker Hannifin Corporation's Cylinder Divison
The first hydraulic press may have been invented in the 3rd Century BC, but the fluid power universe has become a little more complicated since then. Today’s hydraulic cylinders, which essentially convert fluid pressure and flow into force and linear movement, are complex devices incorporating a wide range of individual components available in a multitude of dimensions, configurations and materials.Hydraulic vs. pneumatic
Although pneumatic systems are in some respects simpler, they are generally incapable of achieving the transfer of higher loads and forces. Hydraulic cylinders also have the advantage of smoother, more controllable movement as they are devoid of the spring-like action associated with the release of gaseous fluid media. As an added benefit, hydraulic systems can perform ancillary functions such as lubricating and cooling.
However, since the availability of power and media is a non-negotiable factor in fluid power system design, it should be noted that a properly designed and sized pneumatic system can achieve higher performance where a compact footprint is not required.Design factors in hydraulic cylinder specification
Specifying hydraulic cylinders is essentially a balancing act as each design factor influences one or more of the many other design considerations.
Although NFPA standards and ISO-compliant guidelines are a great starting point for hydraulic system design, many industries have guidelines of their own. Working with an engineering manufacturer experienced with all these standards can expedite the design process.
Cylinder manufacturers can offer a range of options capable of achieving the widest scope of performance requirements that increase the likelihood that standard components will meet the design criteria of an application. The major factors to consider when specifying hydraulic cylinders include:
Every industrial application is unique, and there are many ancillary components involved in hydraulic cylinder specification. Energy-absorbing cushions, pillow blocks, regenerative circuits, over- or under-sizing ports — all these and more contribute to optimizing the performance of hydraulic systems, depending on each application’s specific performance requirements.
As with the specification of more fundamental components, selecting appropriate ancillary components can present a specification challenge. For example, cushions are intended to retard the force of motion, but OEM engineers sometimes overlook the fact that fluids are typically not moving very fast anyway and may not require such redundancy in certain types of systems. An engineer may be tempted to take a “belt and suspenders” approach to designing push/pull systems by using cushions with spring cylinder systems, overlooking the fact that the oil needs to work its way through the cap, hoses, valves and so on. In such cases, specifying standard single action cylinders with cushions may be wiser than attempting to insert cushions into spring cylinders.
There are certainly applications for which specifying the right cylinder for the right duty require some customization either in component size, material type or configuration. However, far more often than not, partnering with an experienced hydraulic system solution manufacturer early in the design process will save the OEM engineering team time and money while ensuring the system does its assigned duties as efficiently as possible for as long as possible.
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Article contributed by Jim Hauser, senior engineer, Parker Hannifin Corporation's Cylinder Division