Fluid pressure boosting device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 2, 2003
Grant Date -
Oct 24, 2002
app pub date -
Apr 15, 2002
filing date -
Apr 18, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a fluid pressure boosting device 1 of the present invention, a control valve 4 is composed of a supply valve 44 and a discharge valve 45, the supply valve 44 comprises an annular valve cone 46 of a poppet type and a first valve seat 7 and the discharge valve 45 comprises an annular valve cone 46 of a poppet type and a second valve seat 8. Inside a rear end portion of a primary piston 21 of a master cylinder 2, a reaction disk 57 made of an elastic material such as rubber is fitted. An input shaft 3 penetrating the control valve is arranged such that, in the inoperative state, an end thereof confronts the reaction disk 57 with a predetermined space therebetween and, in the operative state, the end comes in contact with said reaction disk 57 so that a reaction force is transmitted to the input shaft 3. The passage for discharging hydraulic fluid of the power chamber 9 is composed of annular passages 52, 53. Therefore, a fluid pressure boosting device of a center valve type can be provided of which the structure for attaining the jumping characteristic and the structure of passage for discharging hydraulic fluid are simple.
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