CN103899683A - Actuating expanding device for automobile drum brake and drum brake - Google Patents
Actuating expanding device for automobile drum brake and drum brake Download PDFInfo
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- CN103899683A CN103899683A CN201410152935.1A CN201410152935A CN103899683A CN 103899683 A CN103899683 A CN 103899683A CN 201410152935 A CN201410152935 A CN 201410152935A CN 103899683 A CN103899683 A CN 103899683A
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- brake
- actuating
- guiding element
- drum brake
- braking
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Abstract
The invention discloses an actuating expanding device for an automobile drum brake and the drum brake comprising the actuating expanding device, and belongs to the production field of brakes. The actuating expanding device is characterized in that two radial deep grooves which are symmetrically distributed are formed in the head end of a centre driving shaft, an axial concave arc face is formed in the bottom of each groove, a connecting rod is inserted and connected into each radial deep groove, the two ends of each connecting rod are both convex arc faces, one end of each connecting rod is in sliding fit with the corresponding axial concave arc face, the outer side of the head end of the center driving shaft is sleeved with a guiding part which is fixedly arranged, the two ends of the guiding part are respectively provided with a round guiding hole, a top rod in sliding fit with each round guiding hole is arranged in each round guiding hole, one end of each top rod is a concave arc face and in sliding fit with the convex arc faces at the outer ends of the connecting rods, and the other end of each top rod is convex arc face. A stress arc face is machined at the top end of a brake shoe of the brake and in sliding fit with the top rods. Compared with the prior art, the actuating expanding device is large in expanding angle and flexible in expanding and returning; the drum brake has the advantages of being stable in braking, short in braking distance and the like.
Description
Technical field
The present invention relates to brake producing field, specifically a kind of automobile drum brake is with actuating deploying device and drum brake.
Background technique
Existing automobile drum brake is mostly to promote two rollers 15 on two brake shoes 3 with the involute surface of central actuating shaft 6 head ends (or cam) to both sides, and then promote two support bearing pin 13 opposite direction rotatings of two brake shoes 3 on braking bottom board 8, outwards open.The friction plate 4 being arranged on brake shoe 3 outer arced surface is tightly pressed on the inner headed face of brake drum 1 of rotation, and frictionally reaches the object of car deceleration or parking.Central actuating shaft 6 and roller 15 are actuated deploying device (as shown in Figure 1) as it.The break of said structure, although simple in structure, because central actuating shaft is subject to the restriction of its involute structure, still have the following disadvantages: 1, central actuating shaft turns over same angle, and its lift is relatively too small.Once friction plate 4 serious wear, brake control power will reduce greatly, even brake failure.Can only lean on the corner of frequent adjustment central actuating shaft to make up wear extent.2, opening with return of brake shoe 3 is too slow, causes brake not in time and stopping distance is long, and braking is removed and thoroughly do not produced meaningless friction.3, the involute surface of central actuating shaft is that line contacts with the curved surface of roller 15, quick abrasion, after wearing and tearing, cause open, return resistance increase.4, consider the factor that central actuating shaft lift is relatively little, the friction plate 4 on brake shoe 3 and the gap of brake drum 1 can only be very little.This just causes a large amount of heat of friction generation not leave, and produces high temperature, causes " heat fade " of frictional force, causes brake failure.In addition high temperature causes the distortion of brake drum 1, has more aggravated meaningless friction.
For above-mentioned the deficiencies in the prior art, in the patent documentation that publication number is CN2545425Y, disclose a kind of on driving wheel the break with two-way push block, a kind of asymmetrical cam formula break is disclosed in the patent documentation that publication number is CN102878229A.Although above-mentioned two breaks have avoided existing its braking force of driving cam shaft type brake structure to be subject to the phenomenon that braking force diminishes after friction disc wear to a certain extent.But these two kinds of breaks are because the force bearing point on brake shoe is non-symmetry structure, do not reach the synchronous opening movement of two brake shoes at all, result is that a brake shoe contacts with brake drum, play braking object, another brake shoe cannot contact, do not have braking object, two brake shoes can not synchronous braking.
Summary of the invention
Technical assignment of the present invention is for above-mentioned the deficiencies in the prior art, provide a kind of opening angle large, open return flexibly automobile drum brake with actuating deploying device.
The further technical assignment of the present invention is to provide and contains above-mentioned drum brake of actuating deploying device, and this break has the features such as braking is steady, braking distance is short.
Technical assignment of the present invention is realized in the following manner: a kind of automobile drum brake is with actuating deploying device, comprise central actuating shaft, be characterized in that central actuating shaft head end is processed with two symmetrical radially deep trouths, radially deep trouth bottom land is processed with axial circular arc concave surface, radially deep trouth place is plugged with connecting rod, connecting rod two ends are arc convex surface, its insertion end and the radially axial circular arc concave surface of deep trouth bottom land are slidably matched, the outside of central actuating shaft head end is socketed with the guiding element being fixedly installed, guiding element two ends are respectively arranged with guiding circular hole, in guiding circular hole, be provided with the push rod being slidably matched with it, one end that push rod is positioned at guiding element is circular arc concave surface, and be slidably matched with connecting rod outer end arc convex surface, one end that push rod is positioned at guiding element outside is arc convex surface.
A kind of drum brake, comprise brake drum, braking bottom board, and be arranged on and actuate deploying device and two brake shoes on braking bottom board, the lower end of two brake shoes is hinged by supporting bearing pin and braking bottom board respectively, two brake shoe outer arced surface are all provided with friction plate, between two brake shoes, return spring is installed, actuates deploying device and be arranged between two brake shoes, be characterized in being provided with the deploying device of actuating claimed in claim 1 between the top of two brake shoes.
The structure of brake drum, braking bottom board and Placement thereof, the Placement of central actuating shaft, brake shoe and braking bottom board, and Placement between friction plate, return spring and brake shoe is known technology.
For brake shoe is better coordinated with the above-mentioned deploying device of actuating, can on the relative face in two brake shoe tops, stressed cambered surface be set respectively, push rod is positioned at the one end in guiding element outside and the stressed cambered surface on brake shoe top is slidably matched.
In order to guarantee two brake shoe synchronous brakings, the axle center of the stressed cambered surface on two brake shoes is preferably arranged in same level.
Guiding element is fixedly connected with braking bottom board, can rely on link to be fixed on braking bottom board, also can be cast into one with braking bottom board.
Of the present inventionly actuate deploying device and drum brake compared with prior art has following outstanding beneficial effect:
One, brake shoe opens, return is flexible, there is no catching phenomenon, brakes sensitive.
Two, central shaft drives and turns over same angle, and the opening angle of brake shoe obviously increases, and this just makes braking effect not be subject to the effect of attrition of friction plate.
Three, because brake shoe opening angle is large, it is larger that the gap between friction plate and brake drum on brake shoe can be designed, and this is conducive to heat radiation, avoids or alleviate the phenomenon of braking force " heat fade ".
Four,, when emergency braking, can guarantee maximum braking moment and shorter braking distance.
Five, because of the leading role of guiding element, two brake shoes can guarantee synchronous braking, thereby make braking steadily.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of drum brake in prior art;
Accompanying drawing 2 is structural representations of drum brake of the present invention;
Accompanying drawing 3 is structural representations of the central actuating shaft of drum brake shown in Fig. 2;
Accompanying drawing 4 is that the A of central actuating shaft shown in Fig. 3 is to view;
Accompanying drawing 5 is structural representations of the guiding element of drum brake shown in Fig. 2;
Accompanying drawing 6 is B-B sectional views of guiding element shown in Fig. 5;
Accompanying drawing 7 is structural representations of the push rod of drum brake shown in Fig. 2;
Accompanying drawing 8 is that the C of push rod shown in Fig. 7 is to view;
Accompanying drawing 9 is structural representations of the connecting rod of drum brake shown in Fig. 2.
Embodiment
Actuate deploying device and drum brake be described in detail below with specific embodiment to of the present invention with reference to Figure of description.
Embodiment:
Drum brake of the present invention is mainly by brake drum 1, braking bottom board 2, brake shoe 3, friction plate 4, return spring 5 and actuate deploying device and form.
Brake drum 1 relies on rolling bearing to be slidably connected with Automobile shaft, and braking bottom board 2 relies on link to be fixedly connected with Automobile shaft.The lower end of two brake shoes 3 is hinged with braking bottom board 2 by supporting bearing pin 13 respectively.On the relative face in two brake shoe 3 tops, be processed with respectively stressed cambered surface 14.The axle center of two stressed cambered surfaces 14 is in same level.Two friction plates 4 are separately fixed on the outer arced surface of two brake shoes 3.Return spring 5 is fixedly connected between two brake shoes 3.Actuating deploying device is arranged between two brake shoe 3 tops.
The described deploying device of actuating is mainly made up of central actuating shaft 6, guiding element 7, connecting rod 8 and push rod 9.The head end that is arranged on the central actuating shaft 6 on braking bottom board 2 is processed with two symmetrical radially deep trouths 10.Radially the bottom land of deep trouth 10 is processed with axial circular arc concave surface 11.Described connecting rod 8, its two ends are arc convex surface, and insert radially in deep trouth 10 one end wherein and be slidably matched with the axial circular arc concave surface 11 of deep trouth 10 bottom lands radially.Described guiding element 7, entirety is socketed in the outside of central actuating shaft 6 head ends, and its bottom can rely on link to be fixed on braking bottom board 2, also can be cast into one with braking bottom board 2.Guiding element 7 two ends are processed with respectively guiding circular hole 12.Two push rods 9 are separately positioned in two guiding circular holes 12 and are slidably matched with it.One end that push rod 9 is positioned at guiding element 7 is processed as circular arc concave surface, is slidably matched with connecting rod 8 outer ends.One end that push rod 9 is positioned at guiding element 7 outsides is processed with arc convex surface, is slidably matched with the stressed cambered surface 14 on brake shoe top.
While stepping on brake, the powered central actuating shaft 6 of brake cylinder rotates, actuate push rod 9 axial motions by connecting rod 8 again, thereby two brake shoes 3 are opened, friction plate 4 on brake shoe 3 is just tightly pressed on the inner headed face of brake drum 1 of rotation like this, relies on frictional force make the vehicle deceleration travelling or stop.
Claims (5)
1. an automobile drum brake is with actuating deploying device, comprise central actuating shaft, it is characterized in that: central actuating shaft head end is processed with two symmetrical radially deep trouths, radially deep trouth bottom land is processed with axial circular arc concave surface, radially deep trouth place is plugged with connecting rod, connecting rod two ends are arc convex surface, its insertion end and the radially axial circular arc concave surface of deep trouth bottom land are slidably matched, the outside of central actuating shaft head end is socketed with the guiding element being fixedly installed, guiding element two ends are respectively arranged with guiding circular hole, in guiding circular hole, be provided with the push rod being slidably matched with it, one end that push rod is positioned at guiding element is circular arc concave surface, and be slidably matched with connecting rod outer end arc convex surface, one end that push rod is positioned at guiding element outside is arc convex surface.
2. a drum brake, comprise brake drum, braking bottom board, and be arranged on and actuate deploying device and two brake shoes on braking bottom board, the lower end of two brake shoes is hinged by supporting bearing pin and braking bottom board respectively, two brake shoe outer arced surface are all provided with friction plate, between two brake shoes, return spring is installed, actuates deploying device and be arranged between two brake shoes, it is characterized in that: between the top of two brake shoes, be provided with the deploying device of actuating claimed in claim 1.
3. break according to claim 2, is characterized in that: on the relative face in two brake shoe tops, be respectively equipped with stressed cambered surface, push rod is positioned at the one end in guiding element outside and the stressed cambered surface on brake shoe top is slidably matched.
4. break according to claim 3, is characterized in that: the axle center of the stressed cambered surface on two brake shoes is in same level.
5. break according to claim 4, is characterized in that: guiding element is fixedly connected with braking bottom board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410152935.1A CN103899683B (en) | 2014-04-17 | 2014-04-17 | A kind of automobile drum brake is with actuating deploying device and drum brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410152935.1A CN103899683B (en) | 2014-04-17 | 2014-04-17 | A kind of automobile drum brake is with actuating deploying device and drum brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103899683A true CN103899683A (en) | 2014-07-02 |
| CN103899683B CN103899683B (en) | 2018-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410152935.1A Expired - Fee Related CN103899683B (en) | 2014-04-17 | 2014-04-17 | A kind of automobile drum brake is with actuating deploying device and drum brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103899683B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653662A (en) * | 2015-02-11 | 2015-05-27 | 温州智创科技有限公司 | Drum brake |
| WO2017125064A1 (en) * | 2016-01-22 | 2017-07-27 | 周广如 | Automobile braking mechanism |
| WO2019042310A1 (en) * | 2017-08-29 | 2019-03-07 | 比亚迪股份有限公司 | Drum brake and vehicle |
| WO2019042308A1 (en) * | 2017-08-29 | 2019-03-07 | 比亚迪股份有限公司 | Drum brake and vehicle |
| CN110107619A (en) * | 2019-06-03 | 2019-08-09 | 梁芳文 | A kind of strength cam braking balancing device |
| CN114046320A (en) * | 2021-11-16 | 2022-02-15 | 浙江杭亚新材料有限公司 | Crank throw sheet pin type brake shoe opening device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1070942B (en) * | ||||
| US3623578A (en) * | 1970-07-01 | 1971-11-30 | Gen Motors Corp | Combined self-adjuster and parking brake actuating mechanism |
| US5310028A (en) * | 1992-12-15 | 1994-05-10 | Eaton Corporation | S-cam for drum brake |
| CN2250889Y (en) * | 1995-12-14 | 1997-04-02 | 张万川 | Double pushing rod direct-movement expanding brake for truck |
| CN102182771A (en) * | 2011-03-22 | 2011-09-14 | 杨胜军 | Linkage outer expansion type drum brake |
| CN102878229A (en) * | 2012-09-17 | 2013-01-16 | 浙江大学 | Asymmetrical cam type brake |
| CN203784160U (en) * | 2014-04-17 | 2014-08-20 | 周广如 | Stretching motivating device for automobile drum brake and drum brake |
-
2014
- 2014-04-17 CN CN201410152935.1A patent/CN103899683B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1070942B (en) * | ||||
| US3623578A (en) * | 1970-07-01 | 1971-11-30 | Gen Motors Corp | Combined self-adjuster and parking brake actuating mechanism |
| US5310028A (en) * | 1992-12-15 | 1994-05-10 | Eaton Corporation | S-cam for drum brake |
| CN2250889Y (en) * | 1995-12-14 | 1997-04-02 | 张万川 | Double pushing rod direct-movement expanding brake for truck |
| CN102182771A (en) * | 2011-03-22 | 2011-09-14 | 杨胜军 | Linkage outer expansion type drum brake |
| CN102878229A (en) * | 2012-09-17 | 2013-01-16 | 浙江大学 | Asymmetrical cam type brake |
| CN203784160U (en) * | 2014-04-17 | 2014-08-20 | 周广如 | Stretching motivating device for automobile drum brake and drum brake |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653662A (en) * | 2015-02-11 | 2015-05-27 | 温州智创科技有限公司 | Drum brake |
| CN104653662B (en) * | 2015-02-11 | 2016-04-06 | 温州智创科技有限公司 | A kind of drum is stopped |
| WO2017125064A1 (en) * | 2016-01-22 | 2017-07-27 | 周广如 | Automobile braking mechanism |
| WO2019042310A1 (en) * | 2017-08-29 | 2019-03-07 | 比亚迪股份有限公司 | Drum brake and vehicle |
| WO2019042308A1 (en) * | 2017-08-29 | 2019-03-07 | 比亚迪股份有限公司 | Drum brake and vehicle |
| CN110107619A (en) * | 2019-06-03 | 2019-08-09 | 梁芳文 | A kind of strength cam braking balancing device |
| CN110107619B (en) * | 2019-06-03 | 2024-04-02 | 广西环江航舵汽车科技有限公司 | Powerful cam brake balancing device |
| CN114046320A (en) * | 2021-11-16 | 2022-02-15 | 浙江杭亚新材料有限公司 | Crank throw sheet pin type brake shoe opening device |
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| Publication number | Publication date |
|---|---|
| CN103899683B (en) | 2018-04-10 |
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Granted publication date: 20180410 Termination date: 20210417 |