CN101392805B

CN101392805B - Improved structure of exterior adjusting automobile drum brake

Info

Publication number: CN101392805B
Application number: CN2008101219966A
Authority: CN
Inventors: 任秀军; 任盈盈; 任天伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-27
Filing date: 2008-10-27
Publication date: 2011-09-14
Anticipated expiration: 2028-10-27
Also published as: CN101392805A

Abstract

The invention relates to an automobile part, in particular to an improved structure of a transfer type automobile drum brake for medium and heavy automobiles, which is an improved structure of the transfer type automobile drum brake. The improved structure of the transfer type automobile drum brake mainly comprises a drum body, a brake bottom board, an upper horseshoe, a lower horseshoe and friction lining belts closely coated on the outer surface of the horseshoes; two jacking blocks which can oppositely jack towards static ends of the horseshoes are arranged between the static ends of the upper horseshoe and the lower horseshoe, which are oppositely of semicircular shaped horseshoes; the outer end of a rotating part of a drive device jacked by the jacking blocks extends out of the bottom board of the drum body; and pull force is applied in advance between the static ends of the upper horseshoe and the lower horseshoe by a tension spring. When the driving end of the friction lining belts of the brake is damaged, the rotating part of a threaded sleeve or a threaded rod is rotated by a spanner to drive a triangular wedge to move inwards, and force the static ends of the horseshoes to expand outwards, so that the friction lining belts close to the static ends are also in the friction with the inside wall of the drum body, until the whole friction lining belts are worn. The brake performance of the improved structure is similar to the initial stage, even superior to the initial stage so as to eliminate potential safety hazard and prolong the service life. Because the adjusting end extends out of the bottom board of the drum body, adjustment can be carried out without detaching a wheel boss simply and conveniently.

Description

The improvement structure of exterior adjusting automobile drum brake

Technical field:

The present invention relates to automobile component, in particularly a kind of being suitable for, the improvement of the drum brake of heavy-duty car.

Background technique:

In traditional, heavy-duty car generally adopts drum brake, its typical structure mainly reaches the ferodo, the cam that tightly are overlying on the shoes appearance by drum body, braking bottom board, shoes and forms, two relative shoes one ends that are the semicircle arcuation respectively are rotatably assorted with being loaded on bulging body stationary axle, and the other end is contacted by the Returnning spring application of force and cam.Automobile is when brake, and cam rotation is opened shoes, and the outer Zhang Eryu drum of the non-horizontal moving type of ferodo body madial wall rubs and forces wheel decelerates or stall.Because the quiet end of shoes radial displacement does not take place and do not produce friction, the ferodo that has only the moved end is to brake generation effect, thereby ferodo has only the moved end to be worn.Can take to continue to increase the method for roller, increase the face that is worn of moved end, can't hold roller, but still not produce friction, and need take wheel hub apart and carry out maintenance operation, waste time and energy near the quiet end of shoes until brake shoe; Because the radial thickness of ferodo wearing and tearing does not wait, and exists wasting phenomena, the replacement cycle of ferodo is shortened, cost of transportation improves.Particularly friction facing wearing and tearing are too many, and in order to reach braking effect, cam rotates through the position, makes can't recovering of extension spring, cause roller etc. can't get back to original position, and roller and cam are stuck, and the security incident because of brake failure very easily takes place.

Summary of the invention:

The objective of the invention is to overcome above-mentioned defective, provide a kind of easy to adjust, can prolong the improvement structure of the exterior adjusting automobile drum brake of ferodo replacement cycle.

Technological scheme of the present invention is: a kind of improvement structure of exterior adjusting automobile drum brake, mainly comprise bulging body, braking bottom board, shoes and tightly be overlying on the ferodo of shoes appearance up and down, it is characterized in that two are relatively two jacking blocks that can eject in opposite directions towards the quiet end of shoes are housed between the quiet end of shoes up and down of semicircle arcuation shoes, the base plate of bulging body is stretched out in the outer end of the revolving part of the drive unit that jacking block ejects, up and down between the quiet end of shoes by the extension spring pre-exerting tension.

The structure of the drive unit that described jacking block ejects in opposite directions is: the triangle voussoir is housed in the KanXing Zuo plate, the tail end of voussoir is shaped on the screw rod body, the screw rod body screw-thread fit of the inner of swivel nut revolving part and triangle voussoir, the outer end stretches out in the left wall of KanXing Zuo plate, two jacking blocks that respectively have a wedge surface that a wedge surface with the triangle voussoir is slidingly matched are loaded on the both sides of triangle voussoir, and the quiet end of the back side of jacking block and shoes contacts.The structure of described swivel nut revolving part is: the outer end is shaped on interior hexagonal pit, and the inner is shaped on internal thread, and the outer surface of swivel nut is shaped on outside thread, and its outer end is stretched out the base plate of bulging body and cooperated with locking nut, and big screw inner and in the middle of the wall of a KanXing Zuo plate left side cooperates.

Perhaps, being loaded on the structure that the jacking block between the quiet end of shoes can eject in opposite directions is: the triangle voussoir is housed in the KanXing Zuo plate, the tail end of voussoir is shaped on the swivel nut body, be shaped on the inner of screw rod revolving part of shoulder and the swivel nut body screw-thread fit of triangle voussoir, the outer end stretches out in the left wall of KanXing Zuo plate and the base plate of drum body, two jacking blocks that respectively have a wedge surface are loaded on the both sides of triangle voussoir, the wedge surface of the wedge surface of jacking block and triangle voussoir is slidingly matched, the back side of jacking block cooperates with the quiet end cambered surface of shoes, and the shoulder of screw rod revolving part is between the base plate of triangle voussoir swivel nut body and drum body.

The base plate of the Zuo Biyu drum body of above-mentioned KanXing Zuo plate is fixedly connected by the solid screw rod in top.

The solid screw rod in above-mentioned top runs through the base plate of bulging body and the through hole that is shaped on internal thread of KanXing Zuo plate left side wall, and the solid screw rod in top can be contacted with the left end of jacking block.

The middle part of the right wall of above-mentioned KanXing Zuo plate is shaped on the groove that stretches into for triangle voussoir top, and the top of Zuo Bi and right wall is shaped on the screw of using for fastening cover plate.

Extension spring between the quiet end of described shoes up and down is made up of main extension spring that is positioned at quiet end inboard and the auxilliary extension spring that is positioned at the quiet end outside.

Owing to adopt said structure, the present invention compares with original break, has following beneficial effect: after break uses a period of time, the ferodo moved end is worn and causes brake failure, can unclamp the solid screw rod of locking nut and top of rotatable swivel nut revolving part, with spanner rotary threaded sleeve revolving part or screw rod body revolving part, swivel nut or screw rod body revolving part drive the triangle voussoir and move inward, force up and down jacking block to overcome spring tension the quiet end of shoes is opened outward, at this moment ferodo has more rubbing surface with drum body madial wall.Through repeatedly adjusting, can make ferodo also participate in the friction of drum body madial wall near quiet end, be worn until whole ferodo, Braking efficiency is close even be higher than initial when initial, eliminate safe hidden trouble, at least can prolong the working life of ferodo more than one times, the maintenance cost obviously reduces; Because the force side of swivel nut or screw rod revolving part stretches out in the base plate of bulging body, need not to take apart wheel hub can adjust, simple and convenient.

Description of drawings:

Fig. 1 is the utility model automobile drum brake example structure schematic representation;

Fig. 2 is A among Fig. 1-A cross section structure embodiment 1 schematic representation;

Fig. 3 is a KanXing Zuo plate structure schematic representation among Fig. 2;

Fig. 4 is jacking block shape figure;

Fig. 5 is Fig. 2 intermediate cam voussoir shape figure;

Fig. 6 is embodiment's 2 KanXing Zuo plate structure schematic representation;

Fig. 7 is embodiment 2 triangle voussoir shape figure;

Fig. 8 is A among Fig. 1-A cross section structure embodiment 2 schematic representation;

Fig. 9 is B among Fig. 8-B schematic cross-section;

Figure 10 is revolving part similar alternative arrangements figure among Fig. 8.

Embodiment:

Referring to Fig. 1, the improvement of this automobile drum brake, comprise bulging body, two shoes up and down 5 that are the semicircle arcuation relatively reach the ferodo that tightly is overlying on the shoes appearance, the drive unit that jacking block can eject in opposite directions towards shoes is housed between the quiet end 53 of shoes 5, mark among the figure: the KanXing Zuo plate of 1 drive unit that ejects in opposite directions for jacking block, 91 are the main extension spring that is positioned at quiet end inboard with the pre-application of force tension of the quiet end of two shoes, 92 are the auxilliary extension spring that is positioned at the quiet end outside with the pre-application of force tension of the quiet end of two shoes, 55 is braking bottom board, and right part is a kind of existing structure of drum brake among the figure.

Eject drive unit embodiment 1 in opposite directions referring to Fig. 2 jacking block, in conjunction with Fig. 3～Fig. 5, being loaded on the structure that the jacking block between the quiet end 53 of shoes can eject in opposite directions is: KanXing Zuo plate 1 has left wall 12 and right wall 17, the middle part of right wall 17 is shaped on the groove 16 that stretches into for triangle voussoir 3 tops, to reserve triangle voussoir activity space; Left side wall 12 also has three screws, wherein screw 14 supplies and solid screw rod 7 screw-thread fit in top up and down, the effect one of the solid screw rod 7 in top is to run through base plate of bulging body 8 and KanXing Zuo plate left side wall 12, KanXing Zuo plate 1 is firmly fixed on the bulging body base plate 8, the 2nd, regulate when finishing, the left end that is screwed into solid screw rod 7 in top and jacking block 2 contacts, and keeps jacking block 2 fixing.

Swivel nut revolving part 4 runs through bulging body base plate 8 and KanXing Zuo plate left side wall 12, and its mounting structure is: swivel nut revolving part 4 left ends that stretch out in bulging body base plate 8 are shaped on interior hexagonal pit, adjust outside wheel hub for hexagon wrench; Right-hand member is shaped on internal thread, and outer surface is shaped on outside thread; The outer surface left end of swivel nut cooperates with locking nut 6, big screw 13 screw-thread fit in the middle of right-hand member and the KanXing Zuo plate left side wall 12.Be the flat-bottom slot 11 for ccontaining jacking block 2 and triangle voussoir 3 between the left wall 12 of KanXing Zuo plate 1 and the right wall 17, jacking block 2 can slide up and down at bottom land, and jacking block 2 two ends are shaped on clamp 23, and the two side ends of the quiet end 53 of shoes is positioned at clamp 23 about making, and play the guiding role; The tail end of triangle voussoir 3 is shaped on screw rod body 31, the inner and triangle voussoir screw rod body 31 screw-thread fit of rotatable swivel nut revolving part 4, two jacking blocks 2 that respectively have a wedge surface 21 are loaded on the both sides of triangle voussoir 3, the wedge surface 21 of jacking block is slidingly matched with the wedge surface 32 of triangle voussoir, when swivel nut revolving part 4 rotates, triangle voussoir 3 can not rotate and can only move ahead, by the wedge surface mating reaction, jacking block 2 outwards moves in opposite directions up and down, its curved rear 22 contacts (see figure 9) with the concave arc surface of the quiet end 53 of shoes up and down, the pulling force that overcomes main extension spring 91 and auxilliary extension spring 92 promotes quiet end 53 outer the opening of shoes up and down, has more ferodo near quiet end also to participate in the friction of drum body madial wall.When the ferodo serious wear all heads into to triangle voussoir 3, when the quiet end of ferodo still had neither part nor lot in friction, the jacking block up and down 2 that replaceable size is bigger slightly or change the slope of triangle voussoir 3 was such as positive triangle.The left wall 12 of KanXing Zuo plate and the top of right wall 17 are shaped on screw 15, use for fastening cover plate (not drawing among the figure).

Referring to Fig. 6 embodiment 2, in conjunction with Fig. 4, Fig. 7, Fig. 8, basic structure and embodiment 1 are roughly the same, different is is loaded on the structure that the jacking block between the quiet end 53 of shoes can eject in opposite directions and is: KanXing Zuo plate 1 has left wall 12 and right wall 17, the middle part of right wall 17 is shaped on the groove 16 that stretches into for triangle voussoir 3 tops, to reserve triangle voussoir activity space; Triangle voussoir 3 is housed in the KanXing Zuo plate, its tail end is shaped on swivel nut body 31 and is positioned at the groove 13 of left wall 12 centres, install spacing collar 43 between swivel nut body 31 and the groove 13, be shaped on the inner of screw rod revolving part 4 of shoulder 41 and swivel nut body 31 screw-thread fit of triangle voussoir, the outer end stretches out in the left wall 12 of KanXing Zuo plate and the base plate 8 of drum body, adjusts outside wheel hub for spanner; The shoulder 41 of screw rod revolving part 4 can only rotate screw rod revolving part 4 and can not move between triangle voussoir swivel nut body 31 and spacing collar 43.Swivel nut body 31 also can be made into square-outside and round-inside, makes swivel nut body 31 drive the triangle voussoir and can only move and can not rotate.Two jacking blocks 2 that respectively have a wedge surface are loaded on the both sides of triangle voussoir 3, the wedge surface 21 of jacking block is slidingly matched with the wedge surface 32 of triangle voussoir, the curved rear 22 of jacking block contacts with the concave arc surface of the quiet end 53 of shoes up and down, when the effect that both cambered surfaces cooperate was the moved end opening and closing of shoes up and down, quiet end 53 can rotate around the curved rear 22 of jacking block.

As shown in figure 10, simpler, can cancel spacing collar 43, the shoulder 41 of screw rod revolving part 4 is located immediately between the base plate 8 of card pad 82 and drum body, and the screw rod body is only turned can not be moved.

Claims

1. the improvement structure of an exterior adjusting automobile drum brake, comprise bulging body, braking bottom board (55), shoes (5) reaches the ferodo that tightly is overlying on the shoes appearance up and down, two are relatively and two jacking blocks (2) that can eject in opposite directions towards the quiet end of shoes are housed between the quiet end (53) of shoes up and down of semicircle arcuation shoes and eject drive unit, up and down between the quiet end of shoes by the extension spring pre-exerting tension, it is characterized in that the structure that jacking block ejects drive unit in opposite directions is: be flat-bottom slot (11) between left wall (12) He Youbi (17) of KanXing Zuo plate (1) for ccontaining jacking block (2) and triangle voussoir (3), jacking block (2) can slide at bottom land, the tail end of triangle voussoir is shaped on screw rod body (31), revolving part (4) is made of swivel nut, its screw rod body screw-thread fit inner and triangle voussoir (3), the outer end stretches out in the left wall (12) and the drum body base plate (8) of KanXing Zuo plate, two jacking blocks (2) that respectively have a wedge surface (21) that a wedge surface (32) with the triangle voussoir is slidingly matched are loaded on the both sides of triangle voussoir, and the back side of jacking block (2) cooperates with the quiet end cambered surface of shoes.

2. according to the improvement structure of the described exterior adjusting automobile drum brake of claim 1, it is characterized in that the top of left wall (12) He Youbi (17) of KanXing Zuo plate is shaped on the screw (15) that supplies fastening cover plate.

3. according to the improvement structure of the described exterior adjusting automobile drum brake of claim 1, the structure that it is characterized in that described swivel nut revolving part (4) is: the outer end is shaped on interior hexagonal pit, the inner is shaped on internal thread, the outer surface of swivel nut is shaped on outside thread, its outer end is stretched out the base plate of bulging body and is cooperated with locking nut, and big screw inner and in the middle of the wall of a KanXing Zuo plate left side cooperates.

4. according to the improvement structure of claim 1 or 2 described exterior adjusting automobile drum brakes, it is characterized in that the left wall (12) of KanXing Zuo plate (1) fixedlyed connected by the solid screw rod (7) in top with the base plate (8) of drum body.

5. according to the improvement structure of the described exterior adjusting automobile drum brake of claim 4, it is characterized in that pushing up solid screw rod (7) and run through the base plate (8) of bulging body and the through hole that is shaped on internal thread (14) of KanXing Zuo plate left side wall, the solid screw rod (7) in top and the left end of jacking block (2) are contacted.

6. according to the improvement structure of claim 1 or 2 described exterior adjusting automobile drum brakes, the middle part that it is characterized in that the right wall of KanXing Zuo plate (17) is shaped on the groove (16) that stretches into for triangle voussoir top, and the top of Zuo Bi and right wall is shaped on the screw of using for fastening cover plate (15).

7. according to the improvement structure of the described exterior adjusting automobile drum brake of claim 1, it is characterized in that the extension spring between the quiet end (53) of shoes up and down is made up of main extension spring that is positioned at quiet end inboard (91) and the auxilliary extension spring (92) that is positioned at outside the quiet end.