CN2468851Y - Air pressure disc type brake of automobile - Google Patents

Abstract

The utility model discloses an automobile air pressure disc typed brake relating to an automobile brake. So as to overcome the shortcomings and defects existing in hydraulic disc typed brake, the utility model provides an air pressure disc typed brake with a higher brake efficiency mainly by improving the hydraulic power into the air pressure power. The utility model is characterized in that the linear motion of the push rod of the brake chamber is altered to the linear motion of the piston rod. The mechanism is a single-direction rotation energizing mechansim which is mainly formed by a torsion spring and an adjusting sleeve etc. Another characteristic of the utility model is that the convex edge of the push plate is guided to slide by the oblique groove on the caliper stent. As a result of a unitary power source, a simple pipe system and a high performance price ratio, the utility model has a wide application prospect.

Description

The automobile pressure plate disc brake

The utility model relates to a kind of car brake, specifically, is the state-of-the-art air-pressure disc brake that grows up on the basis of the hydraulic brake of maturation.

Along with expanding economy, in order to improve the transportation-production rate, the moving velocity of automobile is improving constantly.Can the automobile of running at high speed realize that the safety of braking effectively to guarantee automobile and personnel, property is extremely important.The braking of automobile has drum-type and disc type two big classes, and power mode has the branch of hydraulic pressure and air pressure.Early stage automobile brake is based on drum-type, and along with the development of braking technology, plate disc brake has obtained using widely, and its biggest advantage is greatly to have reduced the heat fade tendency of drg, thereby has shortened the required distance of stopping greatly.Yet, present plate disc brake be basically with braking liquid as propulsion source, the quality of braking liquid is the assurance of brake system reliable operation.If there is free gas cut to go into system pipeline, will has a strong impact on the rising of hydraulic pressure, even make hydraulic efficiency pressure system entirely ineffective.

Plate disc brake is compared with drum brake mechanism, and following advantage is arranged:

1. general do not have friction and help the gesture effect, thereby brake efficiency is subjected to the influence of friction coefficient less, and promptly usefulness is more stable.

2. the friction pair structure of the friction pair texture ratio brake shoe brake cheek of brake disc of Cai Yonging and slipper and brake wheel is more conducive to ventilation and heat, has greatly reduced the heat fade tendency of drg.

3. the usefulness reduction of immersion back is less, and only needs twice braking can recover normal.

4. exporting under the identical situation of lock torque size and fair less.

5. brake disc is minimum along the thermal expansion amount of thickness direction, can not resemble brake clearance obviously to be increased the het expansion of brake wheel and cause brake-pedal travel excessive.

6. be easier to realize automatic play compensation, the maintenance repair work is easier.

The plate disc brake of hydraulic pressure is owing to adopt braking liquid as propulsion source, thereby the part that also comes with some shortcomings:

1. usefulness is lower, and it is higher to be used for the required brake actuation line pressure of hydraulic braking sysgtem, generally will use actuating device.

2. braking liquid runs into the high temperature potential evaporation at work, produces air-resistance phenomenon in pipeline, makes brake-system failure.

3. braking liquid is the stronger liquid of a kind of corrosive property, and the metal piece burn into that may make with it often contact gets rusty and produces fixedly, makes that Rubber Parts expands, hardening and damage, cause drg stuck, leak and lost efficacy.

When 4. being used for braking during standstill, the braking during standstill driving device more complicated that need install additional, thereby the application on trailing wheel is restricted.

At present, in Domestic Automotive Industry, hydraulic brake has been widely used in car, but except being used for whole wheels at some exotic performance cars, mostly only as front-wheel brake.On light-duty truck, hydraulic brake also adopts much, but for motorcoach, bogie and heavy motor vehicle, because of its limitation can not effectively be promoted.

The purpose of this utility model is exactly defective and the deficiency that exists at hydraulic brake, provides a kind of more advanced, field of application is more extensive, brake efficiency is higher air-pressure disc brake, to satisfy the requirement of large-tonnage automobile to drg.

The realization of the purpose of this utility model, mainly be that hydraulic power is improved to Pneumatic pressure power, and by a cover Power train, be used on the slipper remaking after the braking force increase conversion, friction between the slipper of dependence brake disc and both sides produces lock torque, the kinetic energy of moving automobile is converted into heat energy, thereby realizes braking.The utility model principal character is that the effect of compressed air brake cylinder is to overlap mechanical transmission mechanism more cleverly by one, the straight-line motion of compressed air brake cylinder push rod is changed into the straight-line motion of piston rod, this mechanism is based on torsion spring and adjusts the unidirectional rotation force-increasing mechanism that cover waits that another feature is that the slurcam flange is subjected to skewed slot guiding slip on the caliper bracket.

The utility model is compared with hydraulic brake, has the following advantages:

1. propulsion source is single, utilizes air sensitive more as the plate disc brake of propulsion source, brake efficiency height, the operation that can alleviate heavy motor vehicle effectively.

2. pipeline system is simple, and the brake system line pressure is lower, and air can cause trailer in order to braking, by the operator on the tractor direct control with pipeline easily.

3. gas leakage is littler than the influence of liquid leakage leakage to the influence of brake system, and is not really high to the brake system sealing requirements.

4. eliminated because of braking liquid is subjected to high temperature evaporation and produced the possibility that air-resistance phenomenon makes brake-system failure.

5. slurcam is subjected to the skewed slot guiding on the caliper bracket to slide the eccentric wear of the piece of effectively reducing friction.

6. be easy to realize braking during standstill, thereby can be used for trailing wheel braking, the directional balance when having improved automobile brake.

7. owing to do not need braking liquid, reduced the cost of M R.

8. install ABS (anti-blocking brake system) additional and realize than being easier to.

9. braking liquid can not occur and leak, help environmental protection.

Describe in detail below in conjunction with accompanying drawing:

Fig. 1 is a compression air brake transmission device pipeline scheme drawing, wherein: and 1.-air compressor, 2.-air tank, 3.-brake pedal, 4.-brake activation valve, 5.-compressed air brake cylinder, 6.-drg.

Fig. 2 is the utility model constructional drawing (main looking),

Fig. 3 is the utility model constructional drawing (left side is looked),

Fig. 4 is the utility model transmission device schematic diagram, wherein: 1-caliper bracket 1,2-caliper body, 3-friction shoe assembly, the 4-slurcam, 5-piston dust boot, 6-rotating assembly, 7-pressure arm, the 8-loam cake, 9-blanking cover, 10-cover of dust, 11-guide pin bushing dust boot, 12-lining, 13-lag bolt, the 14-block, 15-short-range missile cover, 16-alarming line assembly, the 17-overbolt, the long guide pin bushing of 18-, 19-pressing plate, the 20-hex bolt, 21-friction lining stage clip, 22-rotating shaft, 23-antifriction pad, 24-reference seat, 25-belleville spring, the 26-bearing pin, 27-adjusts cover, the 28-torsion spring, the 29-turning collar, 30-compress gasket, 31-stage clip, the 32-banking stop, 33-circlip, 34-needle roller pair, the 35-piston rod, 36-support spring, 37-spline pin.

1. by Fig. 2, Fig. 3, Fig. 4 as can be known, the utility model mainly is made up of caliper bracket 1, caliper body 2, long guide pin bushing 18, short-range missile cover 15, lining 12, pressure arm 7, rotating assembly 6, needle roller pair 34, support spring 36, piston rod 35, slurcam 4 and friction shoe assembly 3, and its annexation is:

1. caliper bracket 1 usefulness overbolt 17, lag bolt 13 are fastenedly connected with long guide pin bushing 18, short-range missile cover 15, and guide pin bushing inserts the Kong Zhongyu lining 12 of caliper body 2 and makes running-fit, so caliper body 2 can be in axial sliding with respect to caliper bracket 1 along the guide pin bushing axis.

2. the friction shoe assembly 3 of brake disc both sides is pressed on the areal of support of caliper bracket 1 by two friction lining stage clips 21.

3. rotating assembly 6 hangs by two support springs 36 and is contained in the inner chamber of caliper body 2, and moves along the cylinder hole.

4. pressure arm 7 one end freedom are against loam cake 8, and another cambered surface forms relative motion by needle roller secondary 34 and rotating assembly 6.

5. piston rod 35 is connected with rotating assembly 6 by screw thread, and its end face spline pin 37 inserts in slurcam 4 spacing holes, has placed restrictions on the rotation of piston rod 35, can only move axially.

6. slurcam 4 is pressed on caliper bracket 1 areal of support by friction lining stage clip 21, the slip of leading in the skewed slot of caliper bracket 1 of the flange of lower end.

2. principle of work of the present utility model is:

Glancing impact, the push rod of compressed air brake cylinder acts in the ball-and-socket of pressure arm 7, make angle of pressure arm 7 swings, the cambered surface of pressure arm 7 other ends is depressed rotating assembly 6 through needle roller pair 34, make it along the reach of caliper body 2 cylinder holes, and inboard friction shoe assembly 3 is pressed against on the brake disc by piston rod 35 and slurcam 4; The counter-force that acts on simultaneously on the caliper body 2 makes caliper body 2 float with respect to caliper bracket 1 by two guide pin bushings 15,18, and outside friction shoe assembly 3 also is pressed against on the brake disc, and both sides friction shoe assembly 3 clamps brake disc and realizes braking.

Wherein, rotating assembly 6 constitutes one group of unidirectional rotation force-increasing mechanism with pressure arm 7, needle roller pair 34, piston rod 35.Bearing pin 26 on the pressure arm 7 and the assembly clearance of adjusting between cover 27 open slots promptly equal to brake fully when brake clearance is setting value required piston rod 35 strokes.After brake disc and friction shoe wearing and tearing, under the situation of brake clearance greater than setting value, after piston rod 35 is subjected to rotating assembly 6 thrusts to be advanced to the setting gap, bearing pin 26 on the pressure arm 7 is stirred and is adjusted cover 27 rotations, the torsion spring 28 of lock ring on adjustment cover 27 twists to be out of shape and drives turning collar 29 rotations, and the friction moment that turning collar 29 relies on stage clip 31 and compress gasket 30 predetermincd tensions to produce impels rotating shaft 22 to rotate, with the piston rod 35 of rotating shaft 22 screw thread transmissions because the restriction of being inserted the spline pin 37 of slurcam 4 spacing holes, can not rotate, can only be forced to become and rotate to moving axially till the drg excessive gaps disappears.This moment, torsion spring 28 tightened up, and its bung flange diameter slightly reduces.After removing air pressure, pressure arm 7 pendulum are got back to initial position, rotating assembly 6 drives piston rod 35 and returns to the position that brake clearance equals setting value under the effect of support spring 36, although and the bearing pin 26 on the pressure arm 7 is stirred 27 revolutions of adjustment cover, but torsion spring 28 opens, and its bung flange diameter slightly increases, and the friction moment between torsion spring 28 and the turning collar 29 disappears, rotating shaft 22 can not be turned round, from but guaranteed that displacement that piston rod 35 is return equals the setting gap of drg.

Since the above-mentioned remarkable advantage of the utility model, thereby be applicable to motorcoach, bogie and heavy motor vehicle, promptly both can be used for front wheel brake, can be used for the trailing wheel braking again, can also realize braking during standstill, and brake efficiency is higher, therefore wide application prospect is arranged.

Claims (1)

1, a kind of automobile pressure plate disc brake, it is characterized in that drg mainly is made up of caliper bracket (1), caliper body (2), long guide pin bushing (18), short-range missile cover (15), lining (12), pressure arm (7), rotating assembly (6), needle roller pair (34), support spring (36), piston rod (35), slurcam (4) and friction shoe assembly (3), its connection relationship is:

1. caliper bracket (1) is fastenedly connected with long guide pin bushing (18), short-range missile cover (15) with overbolt (17), lag bolt (13), guide pin bushing inserts the Kong Zhongyu lining (12) of caliper body (2) and makes running-fit, and caliper body (2) is in axial sliding with respect to caliper bracket (1) along the guide pin bushing axis;

2. the friction shoe assembly (3) of brake disc both sides is pressed on the areal of support of caliper bracket (1) by two place's friction lining stage clips (21):

3. rotating assembly (6) is contained in the inner chamber of caliper body (2) by two support springs (36) are outstanding, and moves along the cylinder hole;

4. pressure arm (7) one end freedom are against loam cake (8), and another cambered surface forms relative motion by needle roller pair (34) and rotating assembly (6);

5. piston rod (35) is connected with rotating assembly (6) by screw thread, and its end face spline pin (37) inserts in slurcam (4) spacing hole;

6. slurcam (4) is pressed on caliper bracket (1) areal of support by friction lining stage clip (21), the slip of leading in the skewed slot of caliper bracket (1) of the flange of lower end.

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