CN2381552Y - Pressure adjusting cylinder for hydraulic braking system of vehicle - Google Patents

Abstract

The utility model relates to a multifunction pressure adjusting cylinder for a hydraulic braking system of a motor vehicle, which comprises a cylinder barrel, a pressure drop piston which moves at a set range with a one-way valve and a channel and a preload pressure spring. The utility model uses a spacing structure for setting the motion quantity of the pressure drop piston in order to obtain many functions of lifting pressure and maintaining pressure, and the pressure relationship between braking branch loops is adjusted by the combination of the pressure adjusting cylinder. The utility model has simple structure, can not change the main structure of a vehicle, and meanwhile, obtains many functions of a booster, a proportional valve, a bypass valve, a compensation valve and others.

Description

The pressure regulating cylinder that hydraulic brake system of motor vehicle is used

The utility model relates to hydraulic brake system of motor vehicle, and particularly the pressure-regulating device of hydraulic brake system of motor vehicle relates in particular to boosting/pressurize multi-functional pressure adjusting cylinder of power actuated vehicle hydraulic braking pipeline system.

Devices such as the existing employed servo-unit of hydraulic brake system of motor vehicle, line pressure control apparatus, bypass disc and throttle compensating valve can only provide simple function separately respectively, and complex structure costs an arm and a leg.The existing employed checking cylinder of hydraulic brake system of motor vehicle provides about equally input pressure to each brake piping, can only be by changing the life-span that the wheel-braking cylinder size is come each axletree drg of balance, but can not accomplish the end in view because of the wheel cylinder size usually is restricted.

The purpose of this utility model provides the pressure regulating cylinder that a kind of hydraulic brake system of motor vehicle is used, it boosts brake-pipe pressure and pressurize, and use the combination of a plurality of pressure regulating cylinders that multiloop brake piping is connected, form multiple use, satisfy multiple requirement simultaneously with same device.

The purpose of this utility model is achieved in that the pressure regulating cylinder of connecting in brake circuit, pressure regulating cylinder comprises cylinder barrel, pressure drop piston, check valve, thimble screw, pretension stage clip and stage clip bearing, pressure drop piston is set in cylinder barrel, there is an end of pretension stage clip that the device of restriction pressure drop piston shift position is set at pressure drop piston, pressure regulating cylinder had boost and pressure holding function; Utilize the combination of a plurality of pressure regulating cylinders to set the interrelation of line pressure between each loop,, satisfy the needs of different braking performance to obtain multiple function.

Advantage of the present utility model is and can very simple structure obtains multiple brake-pipe pressure characteristic, can satisfy balanced brake life-span, alleviate brake pedal force, comprehensively regulate the proportionate relationship of the line pressure between each brake circuit and guarantee the brake system partial failure after performance and etc. the needs that require of multiple different braking, can replace existing servo-unit, apportioning valve, bypass disc, throttle compensating valve and other device simultaneously fully thereby only need adopt, simple in structure, convenient layout and cheap with a kind of device.

The utility model is described in further detail below in conjunction with drawings and Examples: Fig. 1 is pressure regulating cylinder reference position and example structure scheme drawing.Fig. 2 is for boosting and the first packing state scheme drawing.Fig. 3 is the second packing state scheme drawing.Fig. 4 boosts/the pressurize diagram of curves for pressure regulating cylinder.Fig. 5 regulates double circuit hydraulic braking system pipeline pressue-graph for the pressure regulating cylinder combination.1. cylinder barrels, 2. pressure drop pistons, 3. preloading springs, 4. stage clip bearings, 5. thimble screws, 6. check valve A. pressure input cavity B. pressure output cavities among the figure

Pressure regulating cylinder of the present utility model is series in the loop of car brakeing hydraulic efficiency pressure system, as shown in Figure 1, this pressure regulating cylinder is made of cylinder barrel 1, pressure drop piston 2, pretension stage clip 3, stage clip bearing 4 and thimble screw 5, the pressure input cavity A and the pressure output cavity B that are separated by pressure drop piston 2 are arranged in cylinder barrel 1, the passage that is communicated with pressure input cavity A and pressure output cavity B is arranged in the pressure drop piston 2, the check valve 6 of occluding pressure input cavity A and pressure output cavity B is arranged in the passage.When the pressure of the pressure input cavity A of pressure regulating cylinder very hour, pressure drop piston 2 is pressed against by pretension stage clip 3 on the end face of thimble screw 5 check valve 6 is opened, the pressure input cavity A of pressure regulating cylinder and pressure output cavity B communicate.As shown in Figure 2, when the pressure of pressure input cavity A was increased to the thrust that overcomes pretension stage clip 3, pressure drop piston 2 is pushed away thimble screw 5 made check valve 6 block the passage of pressure drop pistons 2, reaches the transformation point that pressure output cavity B boosts.Along with the pressure of pressure input cavity A further raises, the pressure of pressure output cavity B boosts by the transformer ratio of pressure reduction piston 2, simultaneously pressure drop piston 2 moves and discharges braking liquid to pressure output cavity B, overcomes up to pressure drop piston 2 to reach the pressure output cavity B first pressurize transformation point when gap S relies on the pretension stage clip 3 of stage clip bearing 4 or doubling-up.The pressure of this downstream pressure output cavity B no longer raises with the pressure of pressure input cavity A, is about to push open the second pressurize transformation point that check valve 6 reaches pressure output cavity B thereby reach up to the pressure of pressure input cavity A.As shown in Figure 3, after this if the pressure of pressure input cavity A is gone again to raise, braking liquid will be pushed check valve 6 open, and pressure input cavity A is communicated with once more with pressure output cavity B.When the pressure of pressure input cavity A reduces, regulate cylinder to opposite function action in the pressure effect downforce of pretension stage clip 3 and pressure output cavity B, get back to reference position (Fig. 1) up to pressure drop piston 2.The pressure curve of above-mentioned whole process as shown in Figure 4.

One group of a plurality of pressure regulating cylinder of the present utility model are series at respectively in a plurality of loops of hydraulic vehicle brake system.Choose the transformation point that boosts, the first pressurize transformation point and the second pressurize transformation point of each pressure regulating cylinder respectively according to the parameter of whole-car parameters and whole brake system, can reach multiple purpose.The occasion of dividing the loop to arrange before and after the double circuit hydraulic braking system for example respectively adopts a pressure regulating cylinder can obtain as shown in Figure 5 brake-pipe pressure curve in the loop, front and back.Line pressure shown in Figure 5 distribute can be only with a kind ofly install life-span of obtaining drg before and after the balance simultaneously successively, alleviate brake pedal force, prevent the elder generation's locking of backgear ratio front-wheel and the whipping that produces, guarantee before pipe section after losing efficacy the residue performance and improve multiple functions such as being with Jake brake, grade braking and bend brake stability.

Claims (5)

1, the pressure regulating cylinder used of a kind of hydraulic brake system of motor vehicle, comprise cylinder barrel, pressure drop piston, check valve, thimble screw, pretension stage clip and stage clip bearing, it is characterized in that: the pressure input cavity and the pressure output cavity that are separated by pressure drop piston are arranged in cylinder barrel, the passage that is communicated with pressure input cavity and pressure output cavity is arranged in the pressure drop piston, the check valve that occluding pressure input cavity and pressure output cavity are arranged in the passage, the device in the limited level pressure difference of the end piston shift position of pretension stage clip.

2, the pressure regulating cylinder used of hydraulic brake system of motor vehicle according to claim 1 is characterized in that: the device that limits the pressure drop piston shift position is the stage clip bearing.

3, the pressure regulating cylinder used of hydraulic brake system of motor vehicle according to claim 1 is characterized in that: the device that limits the pressure drop piston shift position is the pretension stage clip of doubling-up.

4, the pressure regulating cylinder used of hydraulic brake system of motor vehicle according to claim 1, it is characterized in that: pressure regulating cylinder is a plurality of combinations, and is series at respectively in the loop of hydraulic vehicle brake system.

5, the pressure regulating cylinder used of hydraulic brake system of motor vehicle according to claim 1,

It is characterized in that: the thimble on its thimble screw presses solidly on the thimble screw.

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