Method of sealing low/reverse piston fluid circuit within an automatic transmission case

Inactive Publication Date: 2005-01-13
SONNAX INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] The present invention provides a repair method and apparatus comprising a fluorocarbon grommet seal for installation within the subject ATF feed passage in the transmission case in combination with a steel shim, which compresses the seal in position and maintains the integrity of the low / reverse piston fluid circuit. The steel shim functions as a spacer in substitution for the OEM gasket and also provides a non-compressible backing surface to prevent distortion of the piston retainer when installed. Thus, by removing the OEM gasket from the interface of the piston retainer and the transmission case, the cause of the ATF leakage is eliminated.

Problems solved by technology

This technique still requires compression of the gasket material to seal around the ATF feed passage, which is the root cause of the leakage.
Thus, distortion of the sheet metal piston retainer and subsequent fluid leakage can still occur.

Method used

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  • Method of sealing low/reverse piston fluid circuit within an automatic transmission case
  • Method of sealing low/reverse piston fluid circuit within an automatic transmission case
  • Method of sealing low/reverse piston fluid circuit within an automatic transmission case

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Embodiment Construction

[0019] Prior to describing the present invention in detail, it may be useful to briefly review the structure and function of the low / reverse piston and piston retainer of the Chrysler A604 transmission wherein the present invention is utilized. Although the following disclosure is directed primarily to the Chrysler A604 transmission for purposes of explanation, it will be understood that the present inventive concept is applicable to transmissions of other manufacturers having a similar configuration and, as such, are considered to be within the scope of the present invention.

[0020] With reference to the drawings there is shown therein a prior art Chrysler A604 low / reverse piston, indicated generally at 100, installed within a piston retainer, indicated generally at 110, and illustrated in FIG. 1A. The OEM piston retainer 110 is a stamped sheet metal construction, which is designed to receive the low / reverse piston 100 in sliding engagement therein. Internal and external lip seals ...

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Abstract

An apparatus and method for repairing hydraulic fluid leakage from the low / reverse gear fluid circuit of an automatic transmission case is disclosed. The present repair kit comprises a deformable grommet seal used in combination with a steel shim to replace the original equipment gasket, which is the source of the fluid leakage. Installation of the steel shim compresses the grommet seal in the fluid passage thereby creating a leakproof seal and maintaining the integrity of the low / reverse piston fluid circuit. In addition, the steel shim functions as a spacer in replacement of the original equipment manufacture gasket, which is discarded, and also provides a non-compressible backing surface to prevent distortion of the piston retainer when it is assembled and fastened against the shim.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This patent application claims the benefit under 35 U.S.C. 119(e) of U.S. Provisional Patent Application No. 60 / 348,262 filed Jan. 15, 2002, entitled Method of Sealing Low / Reverse Piston Fluid Circuit.BACKGROUND OF INVENTION [0002] The present invention relates generally to automatic transmission systems and, more particularly, to a method of sealing the low / reverse gear fluid circuit within an automatic transmission case utilizing a grommet seal in combination with a steel shim in place of an original equipment manufacture (hereinafter “OEM”) gasket. [0003] A common service complaint in Chrysler A604 (40TE, 41TE) automatic transmissions (hereinafter “Chrysler transmissions) involves a poorly functioning and / or worn out low / reverse clutch resulting from automatic transmission fluid (hereinafter “ATF”) leakage in the low / reverse piston fluid circuit. Such fluid leakage is problematic in the aforementioned Chrysler transmissions because of...

Claims

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Application Information

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IPC IPC(8): F16H61/00
CPCF16H2057/0068Y10T74/2186Y10T29/4973F16H61/0009
Inventor ROWELL, BRIAN G.
Owner SONNAX INDS
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