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

1973-09-07

1976-02-17

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74867, 74752C, F16h 344, B60k 4118

Patent

active

039384101

ABSTRACT:
Two concurrently operated hydraulic brakes of an automotive transmission, actuated in an intermediate-speed ("second gear") position, are filled under the control of a slide valve whose slider in a normal position admits fluid at high rate to both brakes and thereafter assumes an unstable throttling position in which the fluid pressure gradually builds up in them to a value causing an associated plunger to return the slider to normal. One of the brakes, which is only unidirectionally effective, remains actuated also upon an upshift into a high-speed position ("third gear") whereas the other, bidirectionally effective brake is released upon such upshift under the control of a shift valve which cuts off the fluid flow to the latter brake and establishes a drainage path therefor by passing the slide valve.

REFERENCES:
patent: 3369430 (1968-02-01), Haley
patent: 3453908 (1969-07-01), Iijima
patent: 3494223 (1970-02-01), Mori
patent: 3501979 (1970-03-01), Forster et al.
patent: 3559669 (1971-02-01), Dach
patent: 3593599 (1971-07-01), Dach
patent: 3610070 (1971-10-01), Dach
patent: 3670599 (1972-06-01), Nagamatsu
patent: 3719108 (1973-03-01), Sakai
patent: 3726157 (1973-04-01), Marumo
patent: 3747439 (1973-07-01), Uozumi et al.

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