Automatic transmission

Details Automatic transmission Automatic transmission

1990-11-15

1991-09-03

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74866, 74868, B60K 4110

Patent

active

050442317

ABSTRACT:
An automatic transmission includes transmission mechanism having a friction coupling member for enabling engine brake, and a hydraulic control circuit having a pressure regulator valve for feeding a coupling pressure to the friction coupling member and a cutback valve for reducing the coupling pressure. This automatic transmission further has a cutback valve control device for suspending the cutback in a particular gear ratio in the engine brake enable range. Accordingly, in the engine brake enable range which requires a higher coupling pressure, a sufficient coupling pressure can be assured by suspending the cutback.

REFERENCES:
patent: 3710651 (1973-01-01), Marumo et al.
patent: 4033203 (1977-07-01), Hirosawa et al.
patent: 4065985 (1978-01-01), Taga
patent: 4308765 (1982-01-01), Iwanaga et al.
patent: 4534244 (1985-08-01), Hiramatsu
patent: 4790217 (1988-12-01), Kawano et al.

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