Shift valve of a hydraulic control system for automatic transmis

Details Shift valve of a hydraulic control system for automatic transmis Shift valve of a hydraulic control system for automatic transmis

1992-12-11

1994-08-16

Lorence, Richard M.

Machine element or mechanism

Gearing

Interchangeably locked

477169, 477906, 477142, B60K 2000, F16H 6112

Patent

active

053376250

ABSTRACT:
A shift valve of a hydraulic control system for an automatic transmission system, which ensures safety by maintaining a standard shifting operation when an electronic control system is out of order. A combination of the valve includes a housing, a shift lever of a manual valve, a valve spool of the shift control valve which is movably disposed in the housing against the shift lever, a plurality of ports formed on the housing at a side of the shift lever for supplying or being supplied with hydraulic pressure according to a shifting position, three ports formed on the housing at one side of the valve spool, and another port formed on the housing at the other side of the valve spool the valve spool being moved by the detected pressure to selectively close or open the ports, thereby enabling the automatic transmission at a "D" range, and being moved by being pushed by the shift lever which is manually shifted form a "D" position to a "1" position when the transmission control unit TCU is out of order, so that the ports are selectively closed or opened thereby enabling a manual transmission.

REFERENCES:
patent: 3937108 (1976-02-01), Will
patent: 4351206 (1982-09-01), Lemieux et al.
patent: 4391166 (1983-07-01), Kubo et al.
patent: 4494423 (1985-01-01), McCarthy et al.
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patent: 4815341 (1989-03-01), Ohkubo et al.
patent: 4841816 (1989-06-01), Bullock
patent: 4896568 (1990-01-01), Gierer
patent: 4995285 (1991-02-01), Hayakawa et al.
patent: 5193417 (1993-03-01), Niiyama et al.
patent: 5199313 (1993-04-01), Muller

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