Hydraulic pressure boosting apparatus

Details Hydraulic pressure boosting apparatus Hydraulic pressure boosting apparatus

1998-11-02

2000-12-19

Look, Edward K.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60548, 91368, F16D 3102

Patent

active

061613800

ABSTRACT:
A booster 3 has a structure that a return valve 14 is formed into a two-step throttle incorporating a first throttle valve 36 and a second throttle valve 37 formed continuously from the first throttle valve 36. When a valve spool 28 has been moved forwards when the operation is performed, a gap of the first throttle valve 36 is reduced. Also a gap of the second throttle valve 37 is reduced. Therefore, hydraulic fluid discharged from a pump is passed through an inlet passage 12, and then introduced into the second annular groove 13. Then, the hydraulic fluid is throttled by the first throttle valve 36, and then throttled by the second throttle valve 37. That is, the hydraulic fluid is throttled in the two-step throttling manner. As a result of the two-step throttling structure, the overall velocity of the flow of the hydraulic fluid can smoothly be changed without rapid change. Therefore, fluid flow noise caused from the change in the velocity of the flow can be prevented.

REFERENCES:
patent: 3751912 (1973-08-01), Bach
patent: 4131055 (1978-12-01), Erwin
patent: 4154059 (1979-05-01), Bach et al.

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