JPH0284767U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the negative pressure booster according to the present invention applied to a brake booster, Fig. 2 is a sectional view of a reaction disk used in this booster, and Fig. 3 4 shows another embodiment of the present invention, A is a sectional view of the reaction disk, B is a partial sectional view of the valve body, and FIG. 4 is a sectional view similar to FIG. 3 showing still another embodiment of the invention. , 5th
The figure is a partial sectional view showing still another embodiment of the present invention.
FIG. 6 is a partial sectional view showing still another embodiment of the present invention. 1... Brake booster (negative pressure booster), 2...
Front shell, 3... Rear shell, 4... Valve body, 4b... Annular groove, 4c... Annular projection, 9... Constant pressure chamber, 10... Variable pressure chamber, 19... Valve plunger, 20...
Input shaft, 24... Control valve, 29... Output shaft, 30... Reaction disk, 30a... Annular projection, 30b
...Annular groove.

Claims (1)

[Claims for Utility Model Registration] (1) A valve body that is disposed so as to be movable in and out of the space formed by the front shell and the rear shell, and that penetrates the rear shell in an airtight and slidable manner; a power piston connected to the valve body and partitioning the space into a constant pressure chamber into which negative pressure is introduced and a variable pressure chamber into which air at atmospheric pressure is introduced during operation; and a power piston slidably disposed in the valve body. a valve plunger connected to the valve plunger and disposed in the valve body so as to be able to move forward and backward; a control valve that controls switching to selectively communicate with the constant pressure chamber; A negative pressure booster comprising: an output shaft whose portion penetrates the front shell and protrudes to the outside; and a reaction disk disposed within the recessed fitting portion between the valve plunger and the output shaft, An annular protrusion is provided on either one of the bottom surface of the recessed fitting portion of the valve body and the reaction disk, and an annular groove into which the annular protrusion is fitted is provided on the other of the recessed fitting portion or the reaction disk. A negative pressure booster, further comprising: an annular projection and an annular groove engaged to maintain airtightness. (2) a valve body that is disposed to be movable in and out of the space formed by the front shell and the rear shell and that penetrates the rear shell in an airtight and slidable manner; A power piston that divides a space into a constant pressure chamber into which negative pressure is introduced and a variable pressure chamber into which air at atmospheric pressure is introduced during operation; a valve plunger slidably disposed on the valve body; and the valve plunger. an input shaft connected to the valve body and arranged to move forward and backward within the valve body; and an input shaft provided within the valve body and actuated by the valve plunger to selectively communicate the variable pressure chamber with the atmosphere or the constant pressure chamber. a control valve for switching and controlling the valve body; A negative pressure booster comprising: an output shaft projecting to the outside; and a reaction disk disposed between the valve plunger and the output shaft within the recessed fitting portion; A negative pressure multiplier characterized in that a reaction disk is arranged such that at least one of the valve body and the reaction disk and the reaction disk and the output shaft are in spherical contact with each other. power device.