Method and apparatus for rapid transmission brake release

Details Method and apparatus for rapid transmission brake release Method and apparatus for rapid transmission brake release

1998-12-18

2000-04-18

Bonck, Rodney H.

192 clutches and power-stop control

Transmission and brake

Motor vehicle

294011, B60K 4126, B21K 2300

Patent

active

06050384&

ABSTRACT:
A modification to an automatic transmission having a transmission brake, especially applicable to the TurboHydramatic 400 transmission, allowing for fast, consistent release of the transbrake. The reverse servo cover is modified to add a pressure release passageway communicating with the inside of the reverse servo cover and dumping fluid into the transmission pan. The passageway is selectively blocked by an electrically operated solenoid having a shaft or needle fitting into a seat, so that when the solenoid is powered, the solenoid shaft or needle fits tightly into the seat, preventing the flow of hydraulic fluid from the inside of the reverse servo cover. When power is removed, the pressure of the fluid instantly pushes the solenoid shaft back from the seat, dumping pressure from the reverse servo nearly instantaneously.

REFERENCES:
patent: 4574931 (1986-03-01), Kowalczyk
patent: 4842010 (1989-06-01), Edgecomb et al.
patent: 4883151 (1989-11-01), Tobler
patent: 5090528 (1992-02-01), Massel
patent: 5148720 (1992-09-01), Swenson et al.
patent: 5426991 (1995-06-01), Ohkawa et al.
patent: 5611372 (1997-03-01), Bauer et al.
patent: 5622088 (1997-04-01), Reid
patent: 5662198 (1997-09-01), Kojima et al.
patent: 5694817 (1997-12-01), Reid
Lucas Electronics Ledex Solenoid Catalog, 2 pages.

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