Fluid pressure control system for automatic transmissions

Details Fluid pressure control system for automatic transmissions Fluid pressure control system for automatic transmissions

1974-09-17

1977-02-22

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74869, B60K 4118

Patent

active

040086305

ABSTRACT:
A fluid pressure control system for automatic transmission includes a fluid pressure source, a fluid pressure regulating valve for regulating the fluid from the source to a particular line pressure, and a plurality of frictional engaging devices, adapted to be actuated by the line pressure through means of a manual shift valve, for attaining a particular gear ratio within the gear trains of the transmission which are interposed between the input and output shafts. A governor valve generates a governor pressure in response to the rotational speed of the input shaft, a throttle valve generates a throttle pressure in response to the engine throttle valve, shift valve selectively actuates the frictional engaging devices in response to the governor and throttle pressures, and a reducing valve actuates to restrict the throttle pressure to a threshold calibration value when the throttle pressure exceeds the value.

REFERENCES:
patent: 3561293 (1971-02-01), Fujita et al.
patent: 3563115 (1971-02-01), Iijima et al.
patent: 3651714 (1972-03-01), Ohya et al.
patent: 3667323 (1972-06-01), Irie
patent: 3685372 (1972-08-01), Miyazaki
patent: 3707890 (1973-01-01), Ito
patent: 3710652 (1973-01-01), Miyazaki
patent: 3818783 (1974-06-01), Norris et al.
patent: 3831465 (1974-08-01), Murakami
patent: 3859873 (1975-01-01), Miyauchi et al.
patent: 3871250 (1975-03-01), Miyauchi et al.

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