CN2385938Y

CN2385938Y - Brake master cylinder

Info

Publication number: CN2385938Y
Application number: CN 99218773
Authority: CN
Inventors: 张国辉; 朱兴土; 张丽莹
Original assignee: QIDIE CLUTCH CO Ltd HANGZHOU CITY
Current assignee: Zhang Guohui
Priority date: 1999-08-12
Filing date: 1999-08-12
Publication date: 2000-07-05
Anticipated expiration: 2009-08-12

Abstract

The utility model relates to a brake master cylinder used for a vehicle brake. The utility model is composed of a cylinder body, a piston, a pressing spring, a joint base, and an inverted valve. The head end of the piston is provided with an inner hole to sheath the pressing spring and to reduce the length of the piston and the volume of the master cylinder. A liquid feeding inner cavity of the joint base is provided with the inverted valve to cause brake liquid quickly to enter the cavity. Excess brake liquid can flow back to a liquid storage tank to make a brake wheel cylinder piston completely return. The utility model reaches thoroughly braking off, and increases brake performance of an entire car.

Description

A kind of master brake cylinder

The utility model relates to a kind of master brake cylinder of the brake system of automobile, engineering machine vehicle, fork truck, farm vehicle.

Traditional single, double chamber master brake cylinder structure design is reasonable inadequately, has the defective of all many-sides; The boss that stretches out on the first pull back spring socket piston head, piston length is long, and the corresponding cylinder body length that strengthened has increased master cylinder volume and installing space, is awkward; Its two be the fluid infusion passage by leather cup, protection pad and spring are formed, its passage is narrow, crooked, resistance to braking liquid is big, and compensation liquid flows into time delay in the cylinder, influences piston return speed, the in-use performance instability, simultaneously, will get back to incipient state at piston, the braking liquid in the master cylinder chamber increases, the piston of brake wheel cylinder can not be replied fully, cause the car load braking not remove fully.In addition, be processed with a plurality of hole for back flow on the casing wall of leather cup stroke section, leather cup often rubs mutually with return port, and wearing and tearing are big, and the life-span is short.

To this, the utility model proposes new design technology project, its objective is in order to overcome the weak point that above-mentioned master brake cylinder exists, provide a kind of volume little, the master brake cylinder that in-use performance is stable.

In order to realize goal of the invention of the present utility model, the conception plans that design alternative is following; This master cylinder arrangement includes cylinder body, piston, and plinth, non-return valve, liquid inlet joint, stage clip, the piston head end of inner chamber of cylinder block is provided with endoporus, the attaching stage clip, piston head end is outer to be equipped with shoulder in garden week; The feed liquor inner chamber of plinth is equipped with non-return valve, and non-return valve is by valve rod, and valve seat and awl spring constitute, valve seat one end face socket awl spring, and one of valve rod stretches out inboard wall of cylinder block, and with the moving contact of shoulder, inlet is crossed in the valve rod other end, the inlet taper in the plinth inner chamber.

The good effect that the utility model produces is as follows: compression spring sleeve is connected on the endoporus of piston, has reduced the length of piston, and corresponding volume and the entrucking space that dwindles cylinder body is convenient to operation and saved manufacturing cost; Installed a non-return valve in plinth, substituted the leather cup of original master cylinder inner chamber, fluid infusion passage and liquid return hole that protection pad and spring are formed make return piston stroke speed fast, and the piston in the brake wheel cylinder can be return fully, improve the deceleration and stopping performance of car load.

Now, with reference to the accompanying drawings, in conjunction with the embodiments, technology contents of the present utility model is elaborated.

Fig. 1 is the utility model topology view.

Tandem master cylinder of the present utility model as shown in Figure 1, piston 2 and 5 end are equipped with seal ring, assemble with cylinder body 1 bore seal, piston 2 and 5 head ends are processed with garden shape endoporus, socket stage clip 3 and 13, stage clip 3 connects piston 2 and 5, and in the shape endoporus of 5 one gardens of stage clip 13 socket pistons, other end roof pressure is at cylinder body 1 inwall.Pushing piston 2 moves to left, and overcomes stage clip 3 elastic force, drives piston 5 simultaneously and moves to left, and leaves fixing screw, and two chamber brakings liquid enter the front and rear wheel brake wheel cylinder by the road by liquid outlet 4, reaches brake or deceleration.The correspondence position in two chambeies connects two plinths 8, the feed liquor inner chamber of plinth 8 is connected with inner chamber of cylinder block, the other end is liquid inlet joint 6 in succession, in the feed liquor inner chamber of plinth 8, be equipped with non-return valve, non-return valve is by valve rod 12, valve seat 9 and awl spring 10 are formed, the lower surface socket awl spring 10 of valve seat 9, on the casing wall of the other end top connection headstock of awl spring 10 and the connected entrance of cylinder body, cylinder body 1 inwall is stretched out in the lower end of valve rod 12, the shoulder 11 of the piston 5 during with incipient state is moving to be contacted, and taper inlet 7 is passed in valve rod 12 upper ends, and piston 2 and 5 is when beginning to move to left, shoulder 11 leaves 12 1 of valve rods, in the 10 elastic force effects of awl spring, non-return valve is resetted, valve seat 9 upper surfaces and inlet 7 lower planes are fitted, sealed inlet 7, the stifled braking liquid that ends enters master cylinder 1 inner chamber.Brake off, two-piston 2 and 5 returns in the master cylinder 1, because braking liquid retardance in the pipeline, two chambeies negative pressure occurs beginning moment, brake fluid pressure in the fluid storage tank is big, just enter the feed liquor inner chamber of plinth 8 rapidly from liquid inlet joint 6, roof pressure awl spring 10, valve seat 9 upper surfaces and inlet 7 lower planes form the gap, braking liquid enters master cylinder 1 inner chamber thus, prevents vacuum state.When piston 2 and 5 was about to fall back on reference position, shoulder 11 bumped valve push rod 12 head ends, valve rod 12 occurred and tilted, and valve seat 9 upper surfaces and inlet 7 lower planes form the gap again.At this moment, the excessive braking liquid in the pipeline inflow chamber is back in the fluid storage tank by inlet 7 and liquid inlet joint 6, guarantees the timely return of brake wheel cylinder piston, fully brake off.

Single chamber of the present utility model master brake cylinder, the tandem master cylinder structure has only a chamber relatively, by cylinder body 1, piston 2, stage clip 3, plinth 8 and non-return valve are formed, and liquid outlet 4 links to each other with the back brake wheel cylinder.

Claims

1, a kind of master brake cylinder, it includes cylinder body, piston, stage clip, plinth, non-return valve, liquid inlet joint is characterized in that: offer endoporus, attaching stage clip (3) and (13) on piston (2) and (5) head; The feed liquor inner chamber of plinth (8) is provided with non-return valve, valve seat (4) one end face sockets awl spring (10), and (12) one of valve rods stretch out inboard wall of cylinder block, the moving contact of same shoulder (11).

2, by the described a kind of master brake cylinder of claim 1, it is characterized in that: piston (2) and (5) one outer garden week are provided with shoulder (11).

3, by the described a kind of master brake cylinder of claim 1, it is characterized in that: inlet (7) taper in plinth (8) admission chamber.