Automatic power transmission hydraulic control throttle valve

Details Automatic power transmission hydraulic control throttle valve Automatic power transmission hydraulic control throttle valve

1974-10-03

1976-04-27

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74868, B60K 2100

Patent

active

039526143

ABSTRACT:
A hollow first valve spool has large and small valve lands and an outlet port which is formed therebetween communicating with a throttle pressure passage. A second valve spool having a valve land with a width equal to that of the outlet port is operatively connected with the accelerator of an engine and is telescopically received in the first valve spool. The first valve spool is biased by the hydraulic pressure in the passage and a spring in opposite axial directions and is balanced when in a neutral position in which the land of the second valve spool registers with the outlet port. Movement of the first valve spool in any direction from the neutral position relative to the second valve spool causes communication of the outlet port with a pressurized hydraulic fluid inlet port and with a hydraulic fluid drain port so that the first valve spool is returned into the neutral position by the hydraulic pressure in the passage and by the spring, respectively.

REFERENCES:
patent: 3410159 (1968-11-01), Zundel
patent: 3583259 (1971-06-01), Shimosaki
patent: 3613484 (1971-10-01), Pierce et al.
patent: 3625322 (1971-12-01), Nagamatsu
patent: 3724294 (1973-04-01), Gaus

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