CN2188057Y - Double-membrane vacuum booster - Google Patents

Abstract

The utility model discloses a double-membrane vacuum booster for vehicle braking, wherein, a rear-cavity inner tray set and a membrane are added in a boosting air chamber. Thereby, the boosting air chamber is divided into four cavities connected through channels E, D, A, C, B and a control cavity; the control assembly moves, pushing or dragging a vacuum valve and an air valve to close or open, and then pressure difference between two cavities and the other two ones is generated to increases brake force and lighten the labor intensity of the rider.

Description

Double-membrane vacuum booster

The utility model relates to the work-saving device of hydraulic braking system for automobile.

Have only single diaphragm in the afterburning air chamber of the vacuum booster in the existing brake system of car, constitute two chambeies, during operating mode, make two chambeies form difference of pressure, provide thrust to master brake cylinder, but thrust is little.

The purpose of this utility model provide a kind of in the afterburning air chamber of vacuum booster the two diaphragms of serial connection, constitute the true worker's servo-unit of two diaphragms in four chambeies, the difference of pressure between the increase chamber increases exponentially thrust, alleviates the labour intensity of chaufeur.

Realizing the technical scheme of above-mentioned purpose, is to increasing a rubber diaphragm in the afterburning air chamber of existing vacuum booster, being designed to two diaphragms of concatenation type; Cavity inner sleeve dish after the midway location of afterburning air chamber has been set up one, its outer garden connects rear cover assembly, the endoporus ladder coupling sleeve that is tightly connected, liner O-ring seals, isolated front/back cavity.Two forward and backward rubber diaphragms and liner plate are serially connected in the end face that connects sliding sleeve and ladder coupling sleeve.Preceding rubber diaphragm constitutes I, II two chambeies with back cavity inner sleeve dish, and they are isolated by preceding rubber diaphragm.Back rubber diaphragm constitutes III, IV two chambeies with back cavity inner sleeve dish, and back rubber diaphragm is isolated.Rubber valve seat on the control valve assembly and the valve port on the piston body are formed vacuum valve; It forms choker relief valve with the valve port of air valve seat end face again; Piston body and air valve seat are formed the control valve pocket.I, II, III, four chambeies of IV have passage E, D, A, C, B and control valve pocket to be connected, vacuum valve accent and choker relief valve accent are with the unlatching of the motion of control valve assembly or close and UNICOM or close I, III and II, IV chamber, change the atmospheric pressure between I, III two chambeies and II, IV two chambeies, produce certain difference of pressure, increase braking force.

Cavity inner sleeve dish and rubber diaphragm and liner plate the utility model has been set up one in the afterburning air chamber of existing vacuum booster after, make afterburning air chamber form four chambeies by two original chambeies, motion change vacuum valve port and air valve port by the control assembly listen Push And Release that four chambeies are communicated in twos, produce bigger difference of pressure, increase braking force at double more can alleviate the operation labour intensity of chaufeur than original vacuum booster.

In conjunction with the accompanying drawings embodiment of the present utility model is described in detail now.

Fig. 1 is the utility model topology view.

Vacuum port 1, preceding housing assy 2, channel C 3, rubber diaphragm 4, liner plate 5, passage E6, connection sliding sleeve 7, back housing assy 8, passage D9, passage A10, vacuum valve port 11, rubber valve seat 12, rubber valve seat spring 13, filter pad 14, control valve input rod 15, piston body 16, compression spring 17, air valve port 18, control valve pocket 19, channel B 20, air valve seat 21, reaction plate 22, ladder coupling sleeve 23, back cavity inner sleeve dish 24, pull back spring 25, master cylinder push rod assembly 26.

Cavity inner sleeve dish 24 and preceding rubber diaphragm 4 liner plates 5 after in the afterburning air chamber that preceding housing assy 2 and back housing assy 8 are formed, setting up one, back cavity inner sleeve dish 24 outer rims are connected in the housing assy 8 of back, the be tightly connected outer rim of ladder coupling sleeve 23 of endoporus, the isolated I of sealing, II two chambeies and III, IV two chambeies.Forward and backward liner plate 5 is serially connected in the both ends of the surface that connect sliding sleeve 7 and ladder coupling sleeve 23 with rubber diaphragm 4.Preceding rubber diaphragm 4 isolated I, II two chambeies, back sheet rubber 4 isolated III, IV two chambeies.Preceding housing assy 2, back housing assy 8, back cavity inner sleeve dish 24 are formed I, II, III, IV four chambeies with forward and backward rubber diaphragm 4.The I chamber is communicated with the control valve pocket 19 that the air valve seat 21 in III chamber and piston body 16 and the control assembly is formed by passage A10, D9, E6; The II chamber is communicated with IV chamber and control valve pocket 19 by channel C 3, B20; I, III two chambeies and II, IV two chambeies are communicated with through passage A10, D9 and B20 and control valve pocket 19.Rubber valve seat 12 among the figure, rubber valve seat spring 13, compression spring 17, control valve input rod 15, air valve seat 21 and spring perch are formed control valve assembly.Control valve input rod 15 is hinged with air valve seat 21 bulbs.Rubber valve seat 12 in the control valve assembly is formed vacuum valve with the valve port 11 on the piston body 21, and rubber valve seat 12 is formed choker relief valve with the valve port 18 of air valve seat end face.The vacuum booster mouth is connected with hydraulic brake master by master cylinder push rod assembly 26, and the vacuum port 1 on the vacuum booster makes afterburning air chamber produce negative pressure source by vacuum hose and engine cylinder or vacuum pump UNICOM.When vacuum booster is static, valve port 11 is opened on rubber valve seat 12 and the piston body 21, and rubber valve seat 12 compresses the air valve port 18 on the air valve seat end face, and there are passage A10, C3, D9, E6, B20 and control valve pocket 19 communications and liaison mutually in four chambeies of I, II, III and IV.During operating mode, four chambeies are in low pressure owing to cylinder or vacuum pump are air-breathing or near vacuum, the control valve input rod 15 of control valve assembly moves to left, rubber valve seat 12 is under the effect of seating spring 13, compress and close port 11 with the vacuum valve port 11 on the piston body 21, at this moment, vacuum valve port 11, air valve port 18 are all closed, and I, II two chambeies and III, IV two chambeies are obstructed.When control valve input rod 15 continues reach, air valve seat 21 leaves rubber valve seat 12, air valve port 18 is opened, then ambient atmosphere is through Sponge filter pad 14, control valve pocket 19 and channel B 20 charge into II, IV two chambeies, make II, IV two chamber air pressure are greater than I, III two chambeies, form difference of pressure, act on the reaction plate 22 that is connected on the master cylinder push rod assembly 26 by control valve assembly and be transported to master brake cylinder by master cylinder push rod assembly 26 together with the external force that chaufeur is added on the pedal, reach the light purpose of braking, end of braking, elastic force by means of pull back spring 25 and compression spring 17 makes control valve input rod 15 and air valve seat 21 reset to quiescence, and vacuum valve port 11 is opened.

Claims (1)

1, a kind of pair of diaphragm vacuum booster, it includes control valve assembly, before, back housing assy, master cylinder push rod assembly (26), back cavity inner sleeve dish (24), before, rear lining plate (5), before, back rubber diaphragm (4), connect sliding sleeve (7), ladder coupling sleeve (23), it is characterized in that back cavity inner sleeve dish (24) places afterburning air chamber midway location, the endoporus ladder coupling sleeve (23) that is tightly connected, before, back rubber diaphragm (4) and liner plate (5) are serially connected in and connect the end face that sliding sleeve (7) and ladder connect cover (23), I, II, III, there is passage E in four chambeies of IV, D, A, C, B and control valve pocket F link to each other.