CN201300831Y

CN201300831Y - Plunger type brake master cylinder for automobiles

Info

Publication number: CN201300831Y
Application number: CNU2008201861258U
Authority: CN
Inventors: 钟正荣; 张德志; 刘培
Original assignee: Wuhu Bethel Automotive Safety Systems Co Ltd
Current assignee: Wuhu Bethel Automotive Safety Systems Co Ltd
Priority date: 2008-10-30
Filing date: 2008-10-30
Publication date: 2009-09-02
Anticipated expiration: 2018-10-30

Abstract

The utility model discloses a plunger type brake master cylinder for automobiles, which comprises a master cylinder body, a master cylinder end cap, a first piston and a second piston, wherein the back ends of the first piston and the second piston are respectively provided with counter bores; a first spring and a second spring are respectively arranged in the counter bores; the second spring props against the bottom of the master cylinder body; a hydraulic oil passage is arranged on the master cylinder body; a spring retainer tube is arranged in the counter bore on the back end of the first piston; the back end of the second spring props against the bottom of the spring retainer tube; and the bottom of the spring retainer tube props against the upper end of the second piston. The utility model has a novel structure, uses the contact of the raised edge of the spring retainer tube and a limiting lug boss of the first piston for position limiting, reduces the number of parts, and has the advantages of simple structure and convenient assembly. When the piston reaches full stroke, the first spring and the second spring are respectively pressed in the piston, and the advantages of short brake master cylinder and long stroke are realized. In addition, a leather cup of the plunger brake master cylinder is still corresponding to the master cylinder, the service life of the leather cup is prolonged, and the brake stability thereof is improved.

Description

The plunger tpe automobile braking master cylinder

Technical field:

The utility model relates to automobile component, a kind of specifically plunger tpe automobile braking master cylinder.

Background technology:

Master brake cylinder is the critical component in the brake system of car, its effect is to move by the piston forward in the effect promotion master cylinder of treadle effort, make master brake cylinder produce hydraulic coupling, and pass through the master cylinder oil outlet, thereby realize braking to car load brake system delivery hydraulic pressure power.

The master brake cylinder in early stage has master brake cylinders such as ABS and compensation cellular type, this class master cylinder all will extend along with the increase of stroke and discharge capacity, and this class master cylinder all is that leather cup is fixed on the piston, leather cup is along with piston seesawing in master cylinder, therefore this structure is easy to because of the impurity in the braking liquid scratches master cylinder hole wall and leather cup, and the life-span is short.

Occurred a variety of dual Piston automobile braking master cylinders at present both at home and abroad, but riveted joint is used in every kind of piston assembly, modes such as bolted connection, complex structure, part is many, and is fragile, maintenance difficult.

The utility model content:

The utility model provides a kind of plunger tpe master brake cylinder, be beneficial to overcome the defectives such as life-span weak point that master cylinder body is long and leather cup causes because of wearing and tearing, and this novel master cylinder part is few, and the reliability height, easily processing, assembling is simple.

The technical solution adopted in the utility model:

The plunger tpe automobile braking master cylinder, comprise master cylinder body, master cylinder end cap, first piston, second piston, the master cylinder body back segment is equipped with the second orienting sleeve parts, the second seal ring parts, described second piston and the second orienting sleeve parts, the second seal ring parts sliding block joint; The master cylinder body stage casing is equipped with the cylinder body cover; The master cylinder body leading portion is equipped with the first orienting sleeve parts, the first seal ring parts, the first piston and the first orienting sleeve parts, the first seal ring parts sliding block joint; Between master cylinder body front end and the master cylinder end cap vaccum seal ring is arranged; Described first piston, second piston rear end have counterbore respectively, and first spring, second spring are arranged respectively in the counterbore, and the second spring roof pressure is in the master cylinder body bottom; The braking liquid path is arranged on the described master cylinder body; It is characterized in that: in the counterbore of first piston rear end the spring position-limiting drum is arranged, counterbore mouth inner wall in the first piston has positive stop lug boss, on the spring position-limiting drum bar-shaped trough is arranged, the spring position-limiting drum is inserted in the counterbore of first piston rear end, the spring position-limiting drum is suitable for reading to have the convex edge and the described positive stop lug boss that turn up to constitute left-hand thread, first spring is positioned at the spring position-limiting drum, and the rear end of first spring withstands on spring position-limiting drum bottom; Described spring position-limiting drum bottom roof pressure is in second piston upper end.

Described plunger tpe automobile braking master cylinder is characterized in that perforate is arranged at the sidewall of described spring position-limiting drum and bottom, and air discharge duct is arranged at the bottom of described spring position-limiting drum.

The described second orienting sleeve parts are meant second orienting sleeve, the second orienting sleeve inwall and outer wall have annular groove respectively, be embedded with L shaped seal ring, special-shaped seal ring in the described annular groove respectively, the L shaped seal ring and the second piston bearing fit, special-shaped seal ring cooperates with master cylinder body; The second seal ring parts are meant the second master cylinder leather cup of setting-in on the annular second master cylinder leather cup supporting seat on the annular table terrace that is installed on the master cylinder body back segment and the second annular leather cup supporting seat, the inner ring of the described second master cylinder leather cup and the second piston bearing fit, the outer ring of the second master cylinder leather cup cooperates with master cylinder body; First orienting sleeve is an annular cover, with the first piston bearing fit; The first seal ring parts are meant and are installed on the first leather cup supporting seat on the cylinder body cover leading portion annular table terrace and are flush-mounted in the first master cylinder leather cup on the first leather cup supporting seat, the inner ring of the described first master cylinder leather cup and first piston bearing fit, the outer ring of the first master cylinder leather cup cooperates with master cylinder body.

Principle of work of the present utility model:

Power on pin is stepped on auto pedal is by after the power-assisted of servo-unit, take-off lever by servo-unit is delivered to first piston, travel forward after two pistons in the master cylinder are stressed, after the master cylinder leather cup is passed through in the liquid hole of nourishing of two-piston, master cylinder two pressure chambers begin to build pressure, and hydraulic coupling is transported to the brake system of car load by master cylinder two oil outlets, realize braking function.When treadle effort reduced or disappear, two-piston returned to initial condition under the effect of the drag of spring, was that pressure chamber replenishes braking liquid by the fuel feed hole of the master cylinder edge by nourish liquid hole and master cylinder leather cup on the piston, in order to braking next time.

Advantage of the present utility model:

Novel structure of the present utility model utilizes the convex edge of spring position-limiting drum to be connected with the contact of first piston positive stop lug boss to carry out spacing, has reduced the quantity of part, and is simple in structure, easy to assembly; When piston reached total travel, first and second spring was compressed in respectively in the piston, had realized thus that also master brake cylinder is short, the advantage that stroke is long; In addition, the leather cup of this plunger tpe master brake cylinder all is static with respect to master cylinder, has improved the service life of leather cup and the stability of braking.

Description of drawings:

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model first piston structural representation;

Fig. 3 is the utility model second piston structure scheme drawing;

Fig. 4 is the utility model medi-spring position-limiting drum structure cutaway view;

Fig. 5 is the utility model medi-spring position-limiting drum structural representation.

The specific embodiment:

Referring to Fig. 1-5.

The plunger tpe automobile braking master cylinder, master cylinder body 17 1 ends are captiveed joint with master cylinder end cap 2 screw threads, and contact connects between the second orienting sleeve parts 12, cylinder body cover 8, first orienting sleeve 5, master cylinder end cap 2 and master cylinder 17 step surfaces; Sliding block joint between second piston 10 and the second orienting sleeve parts 12, master cylinder leather cup 16 and the leather cup supporting seat 18, second orienting sleeve 12 with special-shaped seal ring 13, L RunddichtringO 14 grooves are inserted captives joint, second spring, 15 1 ends are positioned at second piston, 10 inside, and the other end is connected with master cylinder body 17 contacts; The first piston 1 and first orienting sleeve 5, master cylinder leather cup 7, leather cup supporting seat 19, sliding block joint between vaccum seal ring 3 and the master cylinder end cap 2, in the counterbore oral area of first piston 1 rear end along on positive stop lug boss 20 is arranged, spring position-limiting drum 9 is inserted in the counterbore of first piston 1 rear end, on spring position-limiting drum 9 outer walls bar-shaped trough is arranged, convex edge 21 contacts with first piston 1 upper limit boss 20 and constitutes left-hand thread on the spring position-limiting drum 9, first spring 6 is arranged in the spring position-limiting drum 9, through hole and air discharge duct 22 are arranged at the bottom, contact with second piston 10, first spring, 6 one ends are positioned at first piston 1 inside, the other end is positioned at spring position-limiting drum 9 bottoms, and end face contacts with spring position-limiting drum 9; First piston 1 and second piston, 10 front ends all are processed with a circle aperture.

Claims

1, plunger tpe automobile braking master cylinder, comprise master cylinder body, master cylinder end cap, first piston, second piston, the master cylinder body back segment is equipped with the second orienting sleeve parts, the second seal ring parts, described second piston and the second orienting sleeve parts, the second seal ring parts sliding block joint; The master cylinder body stage casing is equipped with the cylinder body cover; The master cylinder body leading portion is equipped with the first orienting sleeve parts, the first seal ring parts, the first piston and the first orienting sleeve parts, the first seal ring parts sliding block joint; Between master cylinder body front end and the master cylinder end cap vaccum seal ring is arranged; Described first piston, second piston rear end have counterbore respectively, and first spring, second spring are arranged respectively in the counterbore, and the second spring roof pressure is in the master cylinder body bottom; The braking liquid path is arranged on the described master cylinder body; It is characterized in that: in the counterbore of first piston rear end the spring position-limiting drum is arranged, counterbore mouth inner wall in the first piston has positive stop lug boss, on the spring position-limiting drum bar-shaped trough is arranged, the spring position-limiting drum is inserted in the counterbore of first piston rear end, the spring position-limiting drum is suitable for reading to have the convex edge and the described positive stop lug boss that turn up to constitute left-hand thread, first spring is positioned at the spring position-limiting drum, and the rear end of first spring withstands on spring position-limiting drum bottom; Described spring position-limiting drum bottom roof pressure is in second piston upper end.

2, plunger tpe automobile braking master cylinder according to claim 1 is characterized in that perforate is arranged at the sidewall of described spring position-limiting drum and bottom, and air discharge duct is arranged at the bottom of described spring position-limiting drum.