JPH043865U

JPH043865U -

Info

Publication number: JPH043865U
Application number: JP4432690U
Authority: JP
Priority date: 1990-04-25
Filing date: 1990-04-25
Publication date: 1992-01-14

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す断面図、第２
図イ，ロはプロポーシヨナルピストンの詳細図で
、イは正面図、ロは側方断面図である。１……段付シリンダ、２……第１ピストン、３
……スプール、４……プロポーシヨナルピストン
、５……第２ピストン、６……主附勢スプリング
、７……副附勢スプリング、８……リターンスプ
リング、９……第２ピストン内一方向バルブ、１
０……プロポーシヨナルスプリング、１１……リ
ザーバ側一方向バルブ、１２……アキユムレータ
、１３，１４……一方向バルブ、１５……液圧ポ
ンプ、１６……ブレーキペダル、１７……プツシ
ユロツド。 Fig. 1 is a sectional view showing one embodiment of the present invention;
Figures A and B are detailed views of the proportional piston, where A is a front view and B is a side sectional view. 1...Stepped cylinder, 2...First piston, 3
...Spool, 4...Proportional piston, 5...Second piston, 6...Main energizing spring, 7...Sub-energizing spring, 8...Return spring, 9...One direction in the second piston valve, 1
0... Proportional spring, 11... Reservoir side one-way valve, 12... Accumulator, 13, 14... One-way valve, 15... Hydraulic pump, 16... Brake pedal, 17... Push rod.

Claims

[Scope of utility model registration request]

It is slidably fitted into a cylinder that has a reservoir port that communicates with the reservoir via an orifice, an output port that communicates with the wheel cylinder, and an input port that communicates with the accumulator that is the hydraulic pressure supply source for the hydraulic power brake device. A first piston connected to a brake pedal via a push rod, and a second piston having an urging spring and a return spring interposed between the first piston and the rear end of the cylinder, respectively. The second piston has an input port and an output port provided in the cylinder that are opened when the brake pedal is depressed, and an opening between the input port and the output port when the brake pedal is returned. In a master cylinder for a hydraulic power brake device, which is equipped with a valve mechanism that closes and opens between an output port and a reservoir port, there is a valve in the cylinder parallel to the orifice provided in the reservoir port of the cylinder. A one-way valve on the reservoir side that opens when hydraulic pressure is applied toward the reservoir side is provided, and an input port provided in the cylinder and communicating with the accumulator is provided near the rear end of the second piston. master cylinder.