CN2227057Y

CN2227057Y - Hydraulic reinforcement pump

Info

Publication number: CN2227057Y
Application number: CN95237150U
Authority: CN
Inventors: 李华新
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-07
Filing date: 1995-07-07
Publication date: 1996-05-15
Anticipated expiration: 2005-07-07

Abstract

The utility model relates to a hydraulic reinforcement pump, which is particularly suitable for a vacuum forcing pump in the existing motor vehicle braking system. The utility model is mainly composed of a pump body, a front end shield, a back end shield, a piston, a return spring, a front end cup and a back end cup of the piston, etc. The front end shield and the back end shield are fixedly connected respectively with both ends of the pump body. A low-pressure oil path, which penetrates the front and back ends of the piston in the pump body, is arranged on the side wall of the pump body. The return spring is arranged between the front end cup of the piston and the front end shield. The utility model has the advantages of simple structure, low cost, reliable performance, and easy operation.

Description

A kind of hydraulic booster pump

The utility model belongs to a kind of Hydraulic Pump, the power-increasing pump that particularly a kind of suitable motor vehicle brake is used.

The boost pump mechanism of self-propelled vehicle braking is to increase by a cover pressurizer in the general simple brake system of hydraulic pressure, and the hydraulic coupling of hydraulic braking sysgtem is increased, and to alleviate the labour intensity of chaufeur, shortens stopping distance, guarantees traffic safety.And domestic and international widely used power-increasing pump is the vacuum power-increasing pump at present, degree of vacuum when it utilizes engine operation in the air inlet pipe is as the power source of braking reinforcement, mainly form by vacuum pump rotor, rotor chamber and parts such as blade, valve, this power-increasing pump good braking effect, but complex structure, accuracy requirement height, thereby manufacturing cost height, volume is bigger, and the maintenance difficulty is also bigger.

The purpose of this utility model is the deficiency at above-mentioned vacuum pump type power-increasing pump, designs the hydraulic pressure difference level pump type power-increasing pump of a kind of simple in structure, low cost of manufacture, good operation performance.

Major technique measure of the present utility model is as follows:

A kind of hydraulic booster pump, it is affixed with pump housing two ends respectively that it has the pump housing, front end cover, rear side housing, piston, pull back spring, piston nose leather cup, piston rear end leather cup, its front end cover and rear side housing, be provided with a low pressure oil circuit between the perforation pump housing inner carrier front and back ends on the sidewall of the pump housing, pull back spring is located between front end cover and the piston nose leather cup.

This pump is connected on simple hydraulic braking master cylinder oil outlet end, and its oil outlet end is connected with the wheel wheel cylinder.Glancing impact, step on the pedal of master brake cylinder, through the push rod transmission, power is passed to master cylinder advances its piston forward, when piston-advance, can advance in the power-increasing pump by hydrodynamic pressure, enter the wheel wheel cylinder through the low pressure oil circuit of power-increasing pump and make its start, when pressure that wheel cylinder bore and master cylinder power output balance, because the cylinder diameter of power-increasing pump is greater than the work cylinder diameter of wheel cylinder, so the braking liquid that is pressed into from master cylinder constantly enters power-increasing pump and the piston forward of power-increasing pump is advanced, after advancing to certain stroke, the leather cup cylindrical of piston nose blocks low pressure oil circuit hole, and the braking liquid in piston nose forms high pressure immediately, and this pressure enters the wheel wheel cylinder through the piston transmission, this moment, the unit pressure of wheel cylinder clutch release slave cylinder sharply raise, its gross pressure is increased, and lock torque changes from small to big, thereby plays the effect of high pressure braking.

Behind the loosen the brake, power-increasing pump piston nose pressure is die-offed, and piston was subjected to the double action of pull back spring and wheel wheel cylinder inside brake liquid and return original position this moment, and this moment, opened in low pressure oil circuit hole, the low pressure oil circuit is open-minded, and wheel cylinder inside brake liquid is through low pressure oil circuit backflow master cylinder.Therefore, glancing impact low pressure oil circuit is work earlier, when needing the high pressure reinforcement, high-pressure oil passage is worked automatically, generally need not emergency braking and during crunch high-pressure oil passage do not work not locking of automobile brake during driving substantially, braking is steady, thereby makes brake system have a good working environment.

Therefore, the utlity model has following outstanding advantage: 1, simple in structure, requirement on machining accuracy is not high, volume is little, cost is low; 2, install, use, maintenance is easy, do not have dependence with driving engine, good operation performance; 3, defensive, physical chemistry, interchangeablities etc. are all better, and range of use is wide.Tool is a kind of to replace complex structure, cost height, maintenance difficult, dependence engine operation and the regeneration product of the vacuum booster pump of working.

Accompanying drawing is an embodiment scheme drawing of hydraulic booster pump.

The embodiment that provides below in conjunction with accompanying drawing is described the utility model:

As shown in the figure, the hydraulic booster pump is mainly by the pump housing 12, front end cover 1, rear side housing 17, piston 13, pull back spring 23, piston nose leather cup 9, piston rear end leather cup 14 compositions such as grade, front end cover 1 and rear side housing 17 are affixed with bolt 16 and

packing ring

2 and 15 with the pump housing 12 two ends respectively, before on the sidewall of the pump housing 12, being provided with a perforation pump housing 12 inner carriers 13, low pressure oil circuit 24 between the rear end, have a low pressure oil circuit hole 25 on the low pressure oil circuit 24, when piston 13 advances, this low pressure oil circuit hole 25 will be blocked by the cylindrical of piston nose leather cup 9, and pull back spring 23 is located between front end cover 1 and the piston nose leather cup 9.

Be provided with an oil sump 26 that is connected as a single entity with the pump housing 12 on the pump housing 12 tops, oil sump 26 tops are provided with the oil sump lid 11 affixed with oil sump 26 usefulness bolts 10 and spring chair 3, and oil sump covers 11 and is provided with oil sump plug screw 4.Be provided with a retaining lubricating pad 5 in oil sump plug screw 4 inboards, retaining lubricating pad 6 belows are provided with oil blocking bowl 7 and lubriplate 8, are connected by rivet 6 between oil blocking bowl 7 and the lubriplate 8.The purpose that oil sump 26 is set mainly be make oil can be between piston 13 sidewalls in the oil sump 26 and the pump housing 12 free flow to avoid retardance to piston motion.

Be provided with one " O " RunddichtringO 20 in the pump housing 12 inwall stage casings.And on the processing technology hole of pump housing sidewall low pressure oil circuit 24, be provided with a plug 21.

For making things convenient for being connected of power-increasing pump and master brake cylinder and wheel wheel cylinder, on forward and backward end cap 1 and 17, be equipped with pump outside bonded assembly joint 18 and joint copper packing 19.

Claims

1, a kind of hydraulic booster pump, it is characterized in that: it has the pump housing [12], front end cover [1], rear side housing [17], piston [13], pull back spring [23], piston nose leather cup [9], piston rear end leather cup [14], front end cover [1] and rear side housing [17] are affixed respectively at the pump housing [12] two ends, at the low pressure oil circuit [24] that is provided with on the sidewall of the pump housing [12] between a perforation pump housing [12] inner carrier [13] front and back ends, pull back spring [23] is located between front end cover [1] and the piston nose leather cup [9].

2, hydraulic booster pump according to claim 1, it is characterized in that: be provided with an oil sump [26] that is connected as a single entity with the pump housing [12] on the pump housing [12] top, oil sump [26] top is provided with the oil sump lid [11] affixed with oil sump [26], and oil sump lid [11] is provided with oil sump plug screw [4].

3, hydraulic booster pump according to claim 2 is characterized in that: be provided with a retaining lubricating pad [5] in oil sump plug screw [4] inboard, retaining lubricating pad [5] below is provided with oil blocking bowl [7] and lubriplate [8], is connected by rivet [6] between oil blocking bowl [7] and the lubriplate [8].

4, hydraulic booster pump according to claim 1 is characterized in that: be embedded with one " O " RunddichtringO [20] in the pump housing [12] inwall stage casing.

5, hydraulic booster pump according to claim 1 is characterized in that: be provided with a plug [21] on the processing technology hole of the pump housing [12] sidewall low pressure oil circuit [24].

6, hydraulic booster pump according to claim 1 is characterized in that: on forward and backward end cap [1,17], be equipped with pump outside bonded assembly joint [18].