Hydraulic actuating system for a pair of concurrently operating

Details Hydraulic actuating system for a pair of concurrently operating Hydraulic actuating system for a pair of concurrently operating

1977-12-28

1980-04-29

Husar, C. J.

Machine element or mechanism

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

Preselected indexed position

74867, F16H 344

Patent

active

042000084

ABSTRACT:
A hydraulic control system of the type disclosed in U.S. Pat. No. 3,938,410 is improved by providing a 2-3 shift valve which connects a direct passage and a throttle-containing passage to the control valve for the second clutch or brake (second-friction device) while the pressure in the first clutch or brake (first friction device) is applied to one side of the second control valve, a restoring spring acting upon the opposite side of this second control valve. This valve establishes a threshold for the pressure in the first friction device such that the direct passage is connected to the second friction device below the threshold while the throttle-containing passage is connected to the second friction device at or above this threshold.

REFERENCES:
patent: 3453908 (1969-07-01), Iijima
patent: 3494223 (1970-02-01), Mori
patent: 3719108 (1973-03-01), Sakai
patent: 3726157 (1973-04-01), Marumo
patent: 3938410 (1976-02-01), Dach et al.

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