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A common challenge in the automotive industry is to seal a wide variety of fluids that are being utilized in a host of unique applications. Whether it be due to dynamic motion, component geometry, or a combination of the two, there are many times when an O-ring is not ideal for a part’s sealing needs. When millions of people trust automotive manufacturers with their lives each day, “non-ideal” simply won’t do. Fortunately, Parker has utilized our precision cut and extruded product line to efficiently manufacture solutions to common problems that arise in the automotive industry.
In a transmission, it is the clutch’s job to repeatedly engage and disengage drive shafts from one another to help turn the transmission’s output shaft. This often requires sealing while the clutch is in motion. Parker is able to manufacture D-rings and double chamfer seals that utilize their unique cross-sectional geometry to provide an inherent advantage over O-rings in dynamic situations such as these. The flat base of each of these profiles allows for smooth reciprocating and rotary motion without the potential of bunching, rolling, and/or spiral failure. These products are readily available in AEM or FKM materials, which are often used in transmission applications.
A quick look under the hood is all it takes to notice that there are many caps, nozzles, and covers that contain a wide variety of fluids. Antifreeze, coolant, and oil are the traditional fluids found in an engine, but even on the modern-day hybrid or electric vehicle, there are still many components that are covered and need sealing. Parker’s extrusion and splicing manufacturing process allows us to design seals for a wide range of challenges. Our hollow profiles allow for friction fit groove designs which retain themselves in the groove and can be utilized for low closure force on oil pans, hybrid electric battery covers, and under-the-hood sensor covers. Additionally, Parker can extrude and precision cut rectangular cross-section parts or press-in-place seals for an alternative sealing solution to any of the applications previously described. Spliced or precision cut parts can be manufactured in EPDM, Silicone, FKM, NBR, or HNBR materials.
Due to the high degree of customizability with the precision cut and extruded product line, the possibilities of applications are endless. Parker can manufacture flat rubber washers as bumpers or vibration dampers, tubes of material as fluid transfer seals, and other custom or more exotic profiles can be extruded and precision cut into solid grommets for sealing plug holes and other openings.
Vehicles today are made up of thousands of complex components and the technology is continuing to be pushed further each year. As companies continue to innovate, so will the sealing needs and challenges. With virtually endless possibilities for our precision cut and extruded product line, Parker continues to meet and exceed the sealing needs of the automotive industry.
Visit our Seal Solutions eGuide to find the best sealing solution for your application or speak with one of our engineers by using our Live Chat tool.
This article was contributed by Tyler Karnes, applications engineer, Parker O-Ring & Engineered Seals Division.
Seals and the Quest for MPG
O-Rings and Seals for Automotive Transmission Fluid
Rapid Prototype Program Reduces Seal Project Lead Time
7 Mar 2018
Two things are equally important for the reliable performance of an O-Ring seal: the right size and the right material. Parker’s new O-Ring Selector is an engineering tool that enables users to make the right material and size selections easily, quickly and reliably – in a single application. The accuracy of the results ensures the desired performance of the O-Ring in the subsequent application. This is primarily based on the fact that both functionalities – the material selection and the O-Ring size calculation – are closely interlinked. This achieves a new quality in calculating the total sealing system.
The Parker O-Ring Selector is divided into three main sections:
The Service Conditions & Material Selector section is focused on mapping the material-related application conditions. Entering the operating temperature range, the desired polymer family and/or material hardness will take the user to the suitable material selection. The Advanced Material Selector enables experienced users to specify the operating conditions in even greater detail. Here the medium to be sealed can be selected from a database containing 2,500 media. In addition, a search for required approvals and conformities can be run.
After the dimensions of the system hardware have been entered, the Size Selector will calculate the dimensions and tolerances of the O-Ring based on international standards. Due to the great flexibility of possible entries, the sealing system will be “modeled” realistically. Factors such as thermal expansion or chemical swelling of the sealing element which are necessary for a precise calculation are taken into account.
The Notes section makes it possible for users to add their own comments and remarks to the calculation. Following the O-Ring selection process, the data obtained can be converted into a PDF document and exported.
>>> Start imperial version
>>> Start metric version
Dr. Heinz-Christian Rost
Technology & Innovation Manager
Engineered Materials Group Europe, Prädifa Technology Division
Continuous Molding Enables Production of Large-Size Elastomer Seals in Precision Quality
A Guide to Selecting the Proper Sealing Material for Food Applications
28 Feb 2018
Parker Chomerics THERM-A-GAP TC50 is the latest in the family of soft thermal conductive silicone elastomers developed to conduct heat between a hot component and a heatsink or enclosure. The heavy paste-like consistency of this one component putty can be easily dispensed in a controlled manner to produce different thicknesses in line with customer specific application requirements.
TC50 provides a low thermal impedance at multiple gaps to permit the deployment of commonly used spreaders. In addition, it only requires low compressive force to deform under assembly pressure. As a result, any stress on components, solder joints and leads is minimised.
This one component, RoHS compliant material is formulated to accommodate today’s high-performance electronics and is particularly suitable for volume markets due to ease-of-dispensing using robotics or automation, therefore reducing cycle times and costs considerably.
THERM-A-GAP TC50 is aimed at automotive ECUs (electronic control units), consumer electronics, power supplies and semiconductors, as well as microprocessors, memory and power modules. It can be packaged in syringes or cartridges, or bulk packaged in pails.
Delivering thermal conductivity of 5.5 W/m-K and heat capacity of 1 J/g-K, TC50 is typically suitable for all bond lines over 0.15 mm (0.006 in) thick.
THERM-A-GAP TC50 benefits include.
High thermal conductivity
Easy to handle / dispense
Ideal for high volume applications, such as those in the automotive industry
Can accommodate a variety of bond line applications
Watch our video of THERM-A-GAP TC50 thermal putty being dispensed below.
Learn more about Chomerics thermal interface materials for electronics cooling.
This blog was contributed by Melanie French, marketing communications manager, Parker Chomerics Division Europe.
New Thermal Gel Benefits Consumer and Automotive Applications
The Benefits of Thermally Conductive, Fully Cured Dispensable Gel
EMI Shielding Caulk Delivers Superior Performance in Military Radar Systems
13 Feb 2018
The O-Ring & Engineered Seals Division is now offering a rapid prototype program for solid and hollow spliced O-rings that will reduce lead times on small orders to improve sample and trial testing on enclosure projects. The program provides spliced rings available in a variety of cross sections and can be purchased in either solid or hollow profiles.
In the event that enclosure tolerances are large or the available compressive force is low, Parker engineers can design a custom hollow seal to help absorb large tolerances while providing very low compressive force compared to solid cord. Spliced rings with large inside diameters up to 95” are available in silicone and nitrile materials. Rings with inside diameters up to 57” are available in fluorocarbon. Cross sections of .070”, .103”, .139”, .210” .250” are regularly stocked and available to splice to the ring ID needed. The chart below outlines the current compounds, cross sections, and diameters available under the program.
A short, two-week delivery time provides accelerated design validation prior to production launch. On large projects where customers require confirmation that the ring ID will properly fit the application and provide the needed compression force, the Rapid Prototype Program can reduce the overall lead time – increasing the chance of success. To learn more about this new program, contact your local Parker distributor.
Parker utilizes a hot vulcanizing bonding process to splice our rings. Our bonding material is the same base polymer as the extrusion, giving it equal chemical resistance and physical properties of the seal.
Precision extruded and spliced products offer cost effective sealing solutions for many applications. These include low closure force seals, large diameter seals that cannot be molded, or requirements for hollow O-rings, non-standard O-rings and other extruded profiles with an inside diameter larger than 2.500 inches.
Spliced and fabricated seals offer the designer a tremendous amount of flexibility for challenging applications. Products can be vulcanized from a variety of solid and hollow cross-sections. Due to the low tooling cost and flexibility of the extrusion process, customer profiles can easily be designed to specific application needs.
Extruded and spliced products are available in the following material types: silicone, nitrile (Buna-N), EPDM/EPR, HNBR, fluorosilicone, fluorocarbon, and FFKM. Specialty approved materials are also available that are certified to UL (UL 94 V-0 and UL 157), USP Class VI and FDA white listed materials.
Precision extrusion tolerances
Exclusive use of quality sealing grade materials
Superior hot vulcanization capability (High bond integrity)
Low closure force sealing solutions
Ease of adjusting closure force by adjustment of cross section design, cross section I.D., or durometer
Hollow cross sections are excellent replacements for foam or sponge gaskets, offering superior compression set resistance.
Interference -fit designs available for ease of installation without use of adhesive
Pressure Sensitive Adhesive (PSA) backed extrusions available for flat panel sealing applications.
Low cost option for static face or radial seal O-rings over 2.500" I.D.
Can be used in standard or non-standard grooves
For more information on the benefits of hollow and solid spliced seals, visit Parker's website and chat with an engineer today!
This article was contributed by Wesley Burcham, market manager, Parker O-Ring & Engineered Seals Division.
Sealing Groove-less Applications with Flat Panel Gaskets
Sealing Fundamentals | How to Properly Install a Parker Hollow O-ring
Sealing for Harsh Environmental Conditions in Telecommunications Applications
Environmental Seal Enclosure 101
20 Dec 2017
9 Dec 2017
Electric vehicles are developing fast in line with growing demand. However, only by selecting proven, reliable, high-quality products for the effective thermal management and EMI shielding of batteries, is it possible to maximize performance.
Although electric vehicles represent a greener and cleaner future, they come with a number of technology challenges, including within the battery pack. When large batteries need to provide as much power as possible to supply energy to the car, they generate a considerable amount of heat that must be dissipated. Left unchecked, excessive heat can cause faster battery wear, reduced performance and reduced charge efficiency, not to mention the obvious safety hazards associated with thermal runaway of the battery packs.
Effective thermal management is therefore critical to optimize battery performance and longevity with improved safety and reliability, allowing vehicles to travel greater distances and increasing the achievable run-time on a single charge.
In addition to effective thermal management, another technology challenge presented by the growing demand for electric vehicles is the need to shield against electromagnetic interference (EMI). The cables that travel between the battery and engine, as well as the battery and charger, see high current produced at low frequency. This produces a large magnetic field that can negatively affect other electronics within the vehicle. High shielding attenuation is also required to protect the battery and its circuits from any incoming EMI.
Conductive elastomers can be used to overcome these issues. These elastomers, such as the CHO-SEAL family of elastomer gaskets, are filled with conductive particles and connect interfacing components to reduce the air gap and create a Faraday Cage that blocks EMI fields. Oftentimes, batteries also need to be sealed against environmental dust/fluids. Here, it is possible to deploy combined solutions to support EMI and environmental shielding/sealing.
Form-in-place (FIP) conductive gaskets can be used for battery applications which require shielding of the electric traction elements. FIP can be robotically dispensed directly onto castings making it a low cost option.
Electrically conductive paints, which can replace the metal housing of the battery ECU, can eliminate 35% of the housing weight, and provide cost reductions of up to 65% by eliminating secondary operations. PREMIER PBT-225 is a single pellet electrically conductive polybutylene terephthalate that offers many comparable properties to those of aluminum, along with weight reduction which helps improve the performance of electric vehicles.
Learn more about Parker Chomerics' EMI shielding and thermal management technologies for electric and hybrid vehicles.
This article was contributed by:
Tiberius Recean - sales manager, automotive
David Beresford, marketing and technology manager, Chomerics Division Europe.
Top Three Design Tips for Corrosion Resistant EMI Protection
New Essential Handbook for EMI Shielding Applications
Improved EMI Shielding Consistency of Single Pellet Conductive Plastics
16 Nov 2017