JPS63164075U

JPS63164075U -

Info

Publication number: JPS63164075U
Application number: JP5675287U
Authority: JP
Priority date: 1987-04-16
Filing date: 1987-04-16
Publication date: 1988-10-26

Description

[Brief explanation of the drawing]

第１図はこの考案の１実施例を示す断面図、第
２図は同じく作用説明図である。１：シリンダ本体、１ａ：内部空間、１ｅ：当
接部、２：タンデム型マスタシリンダ、２ａ：後
輪側液室、２ｂ：前輪側液室、３：第１流入ポー
ト、４：後輪のホイールシリンダ、５：流出ポー
ト、６：フエイルセーフピストン、６ａ：小外径
部、６ｂ：大外径部、６ｃ：内端面、６ｅ：内部
空間、６ｉ係止部、８，９，１０，１１，１６，
１７：液封シール、１３：フエイルセーフスプリ
ング、１４：異形プランジヤ、１４ａ：段面、１
４ｂ：大径部、１４ｃ：小径部、１５：第２流入
ポート、１８：第１液室、１９：第２液室、２６
：バルブ、２８：リンク、３３：プロポーシヨニ
ングスプリング、３５：押圧手段。 FIG. 1 is a cross-sectional view showing one embodiment of this invention, and FIG. 2 is an explanatory diagram of the same operation. 1: Cylinder body, 1a: Internal space, 1e: Contact part, 2: Tandem type master cylinder, 2a: Rear wheel side liquid chamber, 2b: Front wheel side liquid chamber, 3: First inflow port, 4: Rear wheel side Wheel cylinder, 5: Outflow port, 6: Fail safe piston, 6a: Small outer diameter section, 6b: Large outer diameter section, 6c: Inner end surface, 6e: Internal space, 6i locking section, 8, 9, 10, 11, 16,
17: Liquid seal, 13: Fail safe spring, 14: Irregular plunger, 14a: Stepped surface, 1
4b: Large diameter part, 14c: Small diameter part, 15: Second inflow port, 18: First liquid chamber, 19: Second liquid chamber, 26
: Valve, 28: Link, 33: Proportioning spring, 35: Pressing means.

Claims

[Scope of utility model registration request]

The tandem master cylinder has a first inflow port that communicates with the rear wheel side liquid chamber, a second inflow port that communicates with the front wheel side liquid chamber, and an outflow port that communicates with the wheel cylinder of the rear wheel. A cylinder body is fixed to the cylinder body, and the cylinder body is slidably inserted into the internal space of the cylinder body, is biased by a fail-safe spring, and is supplied with front wheel side hydraulic pressure from the second inflow port. A cylindrical fail-safe piston that acts on the end face and engages with the abutting portion on the outer end side of the cylinder body; A first liquid chamber communicating with the port and a second liquid chamber communicating with the outflow port are liquid-tightly partitioned by interposing a plurality of liquid seals, and the liquid pressure acting on the difference in pressure receiving area is controlled. Therefore, the fail-safe piston is provided with an irregularly shaped plunger that opens and closes a valve provided between the two fluid chambers, and a pressing means that urges the irregularly shaped plunger to open the valve. A proportioning valve that compresses and moves the fail-safe spring in response to hydraulic pressure in the rear wheel side liquid chamber when activated, locks the irregularly shaped plunger in a locking portion, and releases the valve, A proportioning valve characterized in that all of the liquid seals are provided between the fail-safe piston and the irregularly shaped plunger.