Safeguard for shift control for auxiliary gearing of automatic t

Details Safeguard for shift control for auxiliary gearing of automatic t Safeguard for shift control for auxiliary gearing of automatic t

1990-05-18

1992-08-18

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, 74868, B60K 4106

Patent

active

051389070

ABSTRACT:
In an automatic transmission including an auxiliary gearing drivingly connected to a main gearing, the auxiliary gearing is shiftable between a high gear position wherein a direct clutch is engaged and a reduction brake is disengaged and a low gear position wherein the direct clutch is disengaged and the reduction brake is engaged. A one-way clutch is arranged to complement the action of the reduction brake. A shift valve which controls the auxiliary gearing is subject to a solenoid hydraulic pressure generated by an electro-hydraulic transducer including a solenoid. A reverse-select hydraulic pressure, generated by a manual valve when the manual valve is placed at reverse drive position, is directly applied to the shift valve to hold the shift valve at a low gear position wherein the direct clutch is disengaged and the reduction brake is engaged to condition the auxiliary gearing in the low gear position thereof.

REFERENCES:
patent: 3650161 (1972-03-01), Ito et al.
patent: 4628772 (1986-12-01), Nishikawa et al.
patent: 4680989 (1987-07-01), Sykora et al.
patent: 4700591 (1987-10-01), Yasue et al.
patent: 4709596 (1987-12-01), Boda et al.
patent: 4718311 (1988-01-01), Hayakawa et al.
patent: 4722247 (1988-02-01), Shindo et al.
patent: 4889016 (1989-12-01), Kuwayama et al.
patent: 4903551 (1990-02-01), Hiramatsu et al.
patent: 4942782 (1990-07-01), Kuwayama et al.
"Nissan Full-Range Electronically Controlled Automatic Transmission of the RE4R01A Type (A261C07)" published by Nissan Motor Co., Ltd. in 1987.

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