CN201588892U

CN201588892U - Improved structure of drum brake of car

Info

Publication number: CN201588892U
Application number: CN200920272396XU
Authority: CN
Inventors: 任天伟; 任秀军; 任盈盈
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-21
Filing date: 2009-11-21
Publication date: 2010-09-22
Anticipated expiration: 2019-11-21

Abstract

The utility model relates to an automobile component, in particular to an improved structure of a drum brake of a medium-sized and heavy-duty car. The improved structure mainly comprises a drum body, an upper horseshoe, a lower horseshoe, and friction lining belts tightly covering the outside surfaces of the horseshoes; a straight flute-shaped base plate with a left wall and a right as well as and a bottom surface is mounted between fixed ends of the two opposite semicircular arc-shaped horseshoes; two ejecting blocks, which face to the horseshoes and can oppositely eject, are mounted in a groove and slide under the limitation of the left wall, the right wall and the bottom surface; threads are manufactured on gear shafts of two bevel gears 1 and matched with threads at the bottom of the ejecting blocks; top surfaces of the ejecting blocks are propped against the fixed ends of the horseshoes; bevel gears 2 meshed with the two bevel gears 1 are fixedly mounted at the top end of an adjuster bar; and the tail end of the adjuster bar rotated through force application extends from the left wall of the straight flute-shaped base plate and a bottom plate of the drum body. In brake failure caused by the wearing of movable ends of the friction lining belts of the brake, the adjuster bar can synchronously drive the two ejecting blocks to overcome the extension of the fixed ends of the horseshoes due to spring tension, so that the friction lining belts close to the fixed ends are rubbed together with the inner side wall of the drum body until the whole friction lining belts are worn. Therefore, the improved structure has the advantages that the service life of the friction lining belt is prolonged, the maintenance and repair costs are reduced, and the adjustment is convenient.

Description

The improvement structure of automobile drum brake

Technical field:

The utility model 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, 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 ferodo forces wheel decelerates or stall with the madial wall friction of drum body.Because radial displacement does not take place and does not produce friction in the quiet end of shoes, the ferodo that has only the moved end is to brake generation effect, thereby ferodo has only the moved end to be worn, the radial thickness of ferodo wearing and tearing does not wait, exist wasting phenomena, the replacement cycle of ferodo is shortened, and cost of transportation improves.

The model utility content:

The purpose of this utility model provides a kind of improvement structure that prolongs the automobile drum brake of ferodo replacement cycle.

The technical solution of the utility model is: a kind of improvement structure of automobile drum brake, mainly comprise bulging body, shoes and tightly be overlying on the ferodo of shoes appearance up and down, it is characterized in that two be relatively be equipped with between the quiet end of semicircle arcuation shoes have Zuo Bi, the straight trough shape seat board of right wall and bottom surface, two jacking blocks that can eject in opposite directions towards shoes are housed in the groove, and this jacking block is in Zuo Bi, right wall and bottom surface restriction lower slider; The gear shaft of two umbrella gear one is shaped on screw thread, and respectively cooperates with the jacking block bottom thread, and the quiet end of the end face of jacking block and shoes contacts; The adjustable lever top installs the umbrella gear two with one engagement of two umbrella gear, and the adjustable lever tail end that rotates for the application of force stretches out in the left wall of straight trough shape seat board and the base plate of drum body.

The base plate of the Zuo Biyu drum body of described straight trough shape seat board is fixedly connected by the solid screw rod in top.

Be shaped on limited ring groove on the shaft of described adjustable lever.

Described adjustable lever runs through the base plate and the flute profile seat board left side wall of bulging body, the solid screw rod in top can be contacted with the left end of jacking block, wherein flute profile seat board left side wall has groove one, the limited ring groove of described adjustable lever just is positioned at this groove location, the clamp that is shaped on interior threaded hole inserts with this road groove and cooperates, and center, clamp lower edge is shaped on the breach that engages with described limited ring groove; Described interior threaded hole is fastening with the solid screw rod in top.

The top one of described umbrella gear two is shaped on positioning rod, and the middle part of the right wall of straight trough shape seat board is shaped on the pin-and-hole that stretches into for positioning rod, and the top of Zuo Bi and right wall is shaped on the screw of using for fastening cover plate.

The top of Zuo Bi and right wall is shaped on the screw of using for fastening cover plate.

The end face of described jacking block is made the convex globoidal that cooperates with the concave arc surface of the quiet end of shoes.

Owing to adopt said structure, the utility model is compared 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 adjustable lever, rotate adjusting screw rod with hexagon wrench, adjustable lever drives the gear one of two jacking blocks simultaneously, the rotation of gear one forces jacking block to overcome spring tension the quiet end of shoes is opened outward, and 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, can prolong at least the working life of ferodo more than one times, the maintenance cost obviously reduces, and regulates also very convenient.

Description of drawings:

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

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

Fig. 3 is the utility model package assembly schematic representation among Fig. 2.

Embodiment:

Referring to Fig. 1, the improvement of this automobile drum brake, comprise that bulging body, two is the shoes up and down 5 of semicircle arcuation relatively and tightly is overlying on the ferodo of shoes appearance, the controlling device that jacking block can eject in opposite directions towards shoes is housed between the quiet end of shoes 5, mark among the figure: 1 is straight trough shape seat board, 9 is with the helical spring of the pre-application of force tension of the quiet end of two shoes, and the concave arc surface of the quiet end 53 of two shoes and the convex globoidal of two jacking blocks 2 are contacted under spring tension.Right part is a kind of existing structure of drum brake among the figure.

Referring to Fig. 2, Fig. 3, being loaded on the structure that two jacking blocks 2 between the quiet end 53 of shoes can eject in opposite directions is: straight trough shape seat board 1 has left wall 12, right wall 17 and bottom surface 11, left side wall 12 has three holes, and wherein middle circular hole 13 runs through for adjustable lever 4, and 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 straight trough shape seat board left side wall 12, straight trough shape seat board 1 is firmly fixed on the bulging body base plate 8, the 2nd, with interior threaded hole 124 screw-thread fit on the clamp 123, with fixing chuck plate, the 3rd, adjusting when finishing, the left end that is screwed into the solid screw rod 7 in top and jacking block 2 contacts, keep jacking block 2 fixing, promptly in order to guarantee that jacking block 2 adjusts the stability of position, back, the solid screw rod 7 in top locks the effect of jacking block 2 in addition except connecting straight trough shape seat board 1 and drum body base plate 8.Straight trough shape seat board 1 can be made separately, is fixed in as stated above on the bulging body base plate 8, also can be made into integration with drum body base plate 8.

Be shaped on limited ring groove on the shaft of adjustable lever 4, straight trough shape seat board left side wall 12 has the straight groove 122 that is parallel to left wall groove face 121 together, the limited ring groove of described adjustable lever 4 just is positioned at this groove location, center, clamp 123 lower edge is shaped on the breach that engages with this limited ring groove and inserts with this road groove and cooperate, and adjustable lever 4 can only be rotated and can not move axially.The top of adjustable lever 4 installs or one is shaped on the umbrella gear 23 that meshes with two umbrella gear 1, the adjusting screw rod tail end that rotates for the application of force stretches out in the left wall 12 of straight trough shape seat board and the base plate 8 of drum body, this tail end is shaped on the interior hexagonal pit for the hexagon wrench application of force, outer surface is shaped on outside thread, supplies by nut 6 lock adjustment bars 4.

Because in, the end face of the quiet end of shoes of the drum brake of heavy-duty car is concave arc surface, and when braking, can rotate, in order to guarantee reliability, the end face of jacking block 2 is made the convex globoidal that cooperates with the concave arc surface of the quiet end 53 of shoes, and the concave arc surface of the quiet end 53 of the convex globoidal of two jacking blocks 2 and shoes contacts.The gear shaft of two umbrella gear 1 is shaped on screw thread, and each cooperates with the jacking block bottom thread, when umbrella gear 1 is driven by umbrella gear 23, jacking block 2 slides up and down under the leading role of left wall groove face 121 and right wall groove face 171 and bottom land bottom surface 11 in opposite directions, therefore jacking block 2 can keep vertical motion, assurance is rectified the true position that contacts to shoes is quiet, promote quiet end 53 outer the opening of shoes up and down, make more ferodo near quiet end also participate in the friction of drum body madial wall, reliability and stability are also better.

Be shaped on the projection that inwardly stretches out in the middle of the inner groove surface 171 of the right wall 17 of straight trough shape seat board, projection has pin-and-hole 16 over against the position of umbrella gear 23, and the top one of umbrella gear 23 is shaped on positioning rod 31, positioning rod 31 is inserted in the pin-and-hole 16, takes place radially to rock in the time of can avoiding umbrella gear 23 to rotate and destroys engagement.The position up and down of projection is shaped on pit 18 respectively, and the space of ccontaining umbrella gear 1 is provided.The left wall 12 of straight trough shape seat board and the top of right wall 17 are shaped on screw 15, for fastening cover plate 127 usefulness.The effect of cover plate is with umbrella gear in it and jacking block capping, prevents from that dust from entering to make jacking block produce the slip damping or destroy engagement, has the slide-and-guide effect to jacking block simultaneously, increases reliability.

Claims

1. the improvement structure of an automobile drum brake, mainly comprise bulging body, shoes (5) and tightly be overlying on the ferodo of shoes appearance up and down, it is characterized in that two be relatively be equipped with between the quiet end of semicircle arcuation shoes have left wall (12), the straight trough shape seat board (1) of right wall (17) and bottom surface (11), two jacking blocks (2) that can eject in opposite directions towards shoes are housed in the groove, and this jacking block is in Zuo Bi, right wall and bottom surface restriction lower slider; The gear shaft of two umbrella gear one (21) is shaped on screw thread, and respectively cooperates with the jacking block bottom thread, and the end face of jacking block (2) and the quiet end of shoes contact; Adjustable lever (4) top installs the umbrella gear two (3) with one (21) engagement of two umbrella gear, and the adjustable lever tail end that rotates for the application of force stretches out in the left wall (12) of straight trough shape seat board and the base plate (8) of drum body.

2. according to the improvement structure of the described automobile drum brake of claim 1, it is characterized in that the left wall (12) of straight trough shape seat board fixedlyed connected by the solid screw rod (7) in top with the base plate (8) of drum body.

3. according to the improvement structure of the described automobile drum brake of claim 2, it is characterized in that being shaped on limited ring groove on the shaft of adjustable lever (4).

4. according to the improvement structure of claim 1 or 3 described automobile drum brakes, it is characterized in that adjustable lever (4) runs through the base plate (8) and the flute profile seat board left side wall (12) of bulging body, the solid screw rod (7) in top can be contacted with the left end of jacking block (2), wherein flute profile seat board left side wall (12) has one groove (122), the limited ring groove of described adjustable lever (4) just is positioned at this groove location, the clamp (123) that is shaped on interior threaded hole (124) inserts with this road groove and cooperates, and center, clamp lower edge is shaped on the breach that engages with described limited ring groove; Described interior threaded hole (124) is fastening with the solid screw rod (7) in top.

5. according to the improvement structure of the described automobile drum brake of claim 1, the top one that it is characterized in that umbrella gear two (3) is shaped on positioning rod (31), the middle part of the right wall of straight trough shape seat board (17) is shaped on the pin-and-hole (16) that stretches into for positioning rod (31), and the top of left wall (12) He Youbi (17) is shaped on the screw (15) for fastening cover plate (127) usefulness.

6. according to the improvement structure of the described automobile drum brake of claim 1, it is characterized in that the end face of jacking block (2) is made the convex globoidal that cooperates with the concave arc surface of the quiet end of shoes.