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Ethylene-acrylic bonded piston without oven post curing

An acrylic polymer, piston technology, applied in the direction of piston, cylindrical piston, plunger, etc., can solve the problem of manufacturing cost hindering the production of automatic transmission piston, and achieve the goal of reducing environmental footprint, saving manufacturing cost, and reducing natural consumption. Effect

Inactive Publication Date: 2012-10-03
FEDERAL MOGUL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of such reliable automatic transmission pistons has been hampered by numerous steps, time and corresponding manufacturing costs

Method used

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  • Ethylene-acrylic bonded piston without oven post curing
  • Ethylene-acrylic bonded piston without oven post curing
  • Ethylene-acrylic bonded piston without oven post curing

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] As shown in FIG. 1 , a typical piston 20 for an automatic transmission includes a cylindrical portion 22 made of a metal material and an elastic body 24 coupled to the cylindrical portion 22 . The method of making piston 20 involves coupling the elastomer to cylindrical portion 22 without going through a post-curing step.

[0016] The cylindrical portion 22 of the piston 20 is made of a metallic material such as steel 1010 . The cylindrical portion 22 can also be made of other kinds of steel, aluminum, aluminum alloy or other metal materials. As shown in FIG. 1 , the cylindrical portion 22 of the piston 20 may include a crown 26 and a skirt 28 surrounding the central opening. As shown in Figures 3 and 4, the cylindrical portion 22 may also include a cylindrical ring 30, or other designs suitable for automatic transmission systems. Cylindrical portion 22 generally includes a top surface, an inner surface, and an outer surface.

[0017] As shown in FIG. 1 , the cylindr...

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Abstract

A piston for an automatic transmission includes a cylindrical portion formed of a steel material and an elastomer bonded thereto. The elastomer includes an ethylene- acrylic polymer, a filler, and a hexamethylene diamine curing agent. The elastomer is compression or injection molded to the metal cylindrical portion. During the molding step, the elastomer is cured and achieves a cross-link density, strength, and other physical properties sufficient for use in an automatic transmission. Thus, the piston is formed without a post curing step. The piston provides a lower wear rate and a higher life expectancy than pistons formed with a post curing step.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 293307, filed January 8, 2010, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an elastomeric body suitable for coupling to a metallic material of an automatic transmission piston, and to a method for producing the elastomeric body. Background technique [0004] Automatic transmission pistons are commonly used to hydraulically connect and actuate clutches, gear levers, and brake bands, as well as to perform other mechanical operations. Automatic transmission pistons must be strong, reliable, and have a long life, since failure of such pistons can lead to failure of the entire transmission. Therefore, a rubber or elastomeric ring is usually provided around the metal part of the piston to seal the fluid between the piston and the cylinder or drive shaft along which the pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00
CPCC08F8/00F16J1/006F16D25/12F16D2048/0212Y10T156/10C08F220/12C08F210/02C08F10/02C08F20/10C08J3/24F16J1/01C08F2810/20
Inventor 塞缪尔·罗杰·霍利迪
Owner FEDERAL MOGUL CORP
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