JPH0238369U

JPH0238369U -

Info

Publication number: JPH0238369U
Application number: JP11678988U
Authority: JP
Priority date: 1988-09-07
Filing date: 1988-09-07
Publication date: 1990-03-14

Description

[Brief explanation of drawings]

第１図は本考案による第１実施例を示すホイー
ルシリンダ装置の縦断面図、第２図は第２実施例
の縦断面図、第３図は液圧特性を示す線図である
。１……シリンダハウジング、２……第１ピスト
ン、３……ピストンヘツド、４……第２ピストン
、５，５′……プランジヤ、６……弁座、７……
段付スリーブ、８……第１のスプリング、９，９
′……第２のスプリング、２０……ボール弁、Ｖ
_１……第１の液圧制御機構、Ｖ_２，Ｖ_２′……第
２の液圧制御機構。 FIG. 1 is a longitudinal sectional view of a wheel cylinder device according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a second embodiment, and FIG. 3 is a diagram showing hydraulic characteristics. 1... Cylinder housing, 2... First piston, 3... Piston head, 4... Second piston, 5, 5'... Plunger, 6... Valve seat, 7...
Stepped sleeve, 8...First spring, 9,9
'...Second spring, 20...Ball valve, V
₁ ...First hydraulic pressure control mechanism, _V2 , _V2 '...Second hydraulic pressure control mechanism.

Claims

[Claims for Utility Model Registration] 1. In a wheel cylinder device in which a piston is slidably fitted into a cylinder hole of a cylinder housing, a first cylinder connected to a fluid source is provided on the circumferential surface of the intermediate portion in the axial direction. a first hydraulic pressure control mechanism comprising: a piston having a liquid chamber and defining a second liquid chamber at the rear thereof; and a rear portion of a plunger and a valve seat in a flow path communicating the two liquid chambers; , a first spring that biases the first hydraulic pressure control mechanism in the opening direction; and a second spring that temporarily closes the first hydraulic pressure control mechanism against the first spring; A pressure-receiving shaft portion, on which the liquid pressure of a first liquid chamber provided at the front portion of the plunger acts, in order to reduce the liquid pressure in the liquid chamber at a constant rate; a stepped sleeve having a large diameter front pressure receiving surface and a small diameter rear pressure receiving surface on which the hydraulic pressure of the liquid chamber acts in the axial direction; a second spring biasing the stepped sleeve forward; a second hydraulic pressure control mechanism configured between the stepped sleeve and the plunger to maintain the first hydraulic pressure control mechanism in a normally open state against a second spring; A wheel cylinder device characterized in that first and second hydraulic pressure control mechanisms are provided coaxially with the piston. 2. In a wheel cylinder device in which a piston is slidably fitted into a cylinder hole of a cylinder housing, a first liquid chamber communicating with a fluid source is provided on the circumferential surface of the intermediate portion in the axial direction, and a first liquid chamber is provided at the rear. a piston that defines a second liquid chamber; a first hydraulic pressure control mechanism that includes a rear part of a plunger and a valve seat in a flow path that communicates the two liquid chambers; A first spring biases the mechanism in the opening direction, and the first hydraulic pressure control mechanism is temporarily closed against the first spring, and the hydraulic pressure in the second liquid chamber is controlled at a constant rate. A ball valve and a valve seat are provided in a flow path communicating between a pressure-receiving shaft part on which the liquid pressure of a first liquid chamber provided in the front part of the plunger acts to reduce the pressure, and both liquid chambers formed in the plunger. and a second spring that biases and holds the second hydraulic pressure control mechanism in a closed state, the first and second hydraulic pressure control mechanisms are A wheel cylinder device characterized in that it is provided coaxially with the piston.