Apparatus and method for changing automatic transmission fluid

Details Apparatus and method for changing automatic transmission fluid Apparatus and method for changing automatic transmission fluid

1994-10-07

1996-06-04

Look, Edward K.

Lubrication

Automobile crank and gear case service

184 64, 184108, 141 98, F16N 3300

Patent

active

055224741

ABSTRACT:
A system and method for extracting used transmission fluid from an automatic transmission in a motor vehicle utilizing the vehicle engine. A reservoir is provided having a free floating piston therein, dividing the reservoir into two chambers. A first flexible line connects from a first chamber to a transmission fluid outlet of the transmission, and a second flexible line connects from a second chamber to a fluid input of a transmission fluid cooler. The second chamber is initially filled with fresh fluid forcing the piston toward the first chamber. Operation of the vehicle engine causes the transmission pump to pump used fluid into the first chamber, forcing the piston to expell fresh fluid from the second chamber, and into the cooler and transmission. A sight gauge in the first flexible line permits visual monitoring of the flow of dark, used fluid to determine when all of the fluid in the transmission has been ejected, collected in the first chamber for disposal, and completely replaced with fresh fluid.

REFERENCES:
patent: 820508 (1906-05-01), Leonhardt
patent: 3513941 (1970-05-01), Becnel
patent: 3983958 (1976-10-01), Swearingen
patent: 4031966 (1977-06-01), Farrell
patent: 4807674 (1989-02-01), Sweet
patent: 5318080 (1994-06-01), Viken
patent: 5361870 (1994-11-01), Caurcy

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