CN105090299B - Can self-regulated drum brake - Google Patents
Can self-regulated drum brake Download PDFInfo
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- CN105090299B CN105090299B CN201510629292.XA CN201510629292A CN105090299B CN 105090299 B CN105090299 B CN 105090299B CN 201510629292 A CN201510629292 A CN 201510629292A CN 105090299 B CN105090299 B CN 105090299B
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- self
- brake
- adjusting
- ratchet
- regulated
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- 230000001105 regulatory effect Effects 0.000 title abstract 12
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims 1
- 230000000712 assembly Effects 0.000 abstract 2
- 238000000429 assembly Methods 0.000 abstract 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 241000239290 Araneae Species 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Abstract
Can self-regulated drum brake the invention discloses one kind, including brake backing plate and two shoe brakes, two shoe brakes are respectively rotatably fixed on back-plate, and the drum brake also includes self-regulated stopping means, including plectrum, self-regulated ratchet assemblies, self-regulated return spring and limit spring.Self-regulated ratchet assemblies include self-regulated threaded rod, ratchet and sleeve；Self-regulated threaded rod is fixedly connected with shoe brake, and sleeve is enclosed on self-regulated threaded rod, and ratchet is fixed on sleeve, and plectrum is fixed on shoe brake, and the first end of plectrum is connected with the first end of self-regulated return spring, and the second end coordinates with the ratchet on ratchet.The present invention provide can self-regulated drum brake by setting limit spring to be supported between shoe brake and plectrum, from timing after brake shoe plate abrasion, limit spring can carry out spacing to the rotation of plectrum, it is therefore prevented that phenomenon that what self-regulated was excessively caused dawdle.Compared with prior art, the structure of push rod is eliminated, assembling is simplified, reduces cost.
Description
Technical Field
The invention relates to a brake technology in an automobile brake system, in particular to a drum brake capable of self-adjusting.
Background
Automobiles are generally classified into two types, a disc brake and a drum brake. For a drum brake, the brake of an automobile is mainly realized by stepping on a brake pedal by a driver, transmitting brake hydraulic pressure to a slave cylinder, expanding brake shoes, and generating friction between the brake shoes and a brake drum to generate braking force. When the driver releases the brake pedal, the pressure in the brake cylinder disappears, and the brake shoe returns.
After a drum brake works for a period of time, the brake shoes are worn, and the gap between the brake shoes and the brake drum is increased, so that the gap needs to be adjusted. Drum brakes are generally classified into self-adjustable and non-self-adjustable configurations. For self-adjustable drum brakes, the clearance between the brake shoes and the brake drum can be automatically adjusted as the clearance increases.
Fig. 1 is a schematic structural diagram of a drum brake capable of self-adjusting in the prior art, and fig. 2 is a schematic partial structural diagram of a drum brake self-adjusting limiting device in the prior art. As shown in fig. 1 and 2, a self-adjustable drum brake 100 in the prior art includes a brake base plate 110, a brake shoe 120, and a self-adjusting limiting device 130, where the brake shoe 120 is fixed on the brake base plate 110, and the self-adjusting limiting device 130 includes a dial 131, a self-adjusting ratchet assembly, a push rod 132, and a self-adjusting return spring 133. Wherein, plectrum 131 is rotationally fixed on brake shoe 120, and self-modulation ratchet subassembly includes self-modulation threaded rod 134, sleeve 135 and ratchet 136, and the both ends of self-modulation threaded rod 134 link to each other with two brake shoe 120 respectively, and sleeve 135 is provided with the internal thread, and sleeve 135 passes through threaded connection and overlaps on self-modulation threaded rod 134, and ratchet 136 sets up on the outer wall of sleeve 135. One end of the pick 131 is connected to one end of the push rod 132, and the other end of the pick 131 is engaged with the ratchet on the ratchet wheel 136. The other end of the push rod 132 is fixed to the brake base plate 110 through a fixing plate. The self-adjusting return spring 133 is sleeved on the push rod 132, and one end of the self-adjusting return spring 133 is hooked with one end of the shifting piece 131, and the other end is fixed on the brake bottom plate 110.
In the prior art, after the gap between the brake shoe 120 and the brake drum becomes larger, the stroke of the brake shoe 120 expanding during braking becomes larger, and the brake shoe 120 drives the shifting piece 131 to rotate and expand outwards. At this time, the self-adjusting return spring 133 pulls the shifting piece 131 to rotate, so that the shifting piece 131 drives the ratchet wheel 136 to further drive the sleeve 135 to rotate, the sleeve 135 rotates and moves relative to the self-adjusting threaded rod 134 to increase the thread stroke, the amplitude of the brake shoe 120 which is propped open is increased under the action of the self-adjusting threaded rod 134, the shifting piece 131 and the ratchet wheel 136 cannot rotate in the opposite direction at this time, and the self-adjusting function is realized.
The self-adjustable drum brake in the prior art limits the shifting sheet through the push rod, the self-adjustable return spring is arranged on the push rod, the assembly is difficult, the phenomenon of excessive adjustment can occur under the action of the push rod and the ratchet wheel can not rotate, the gap between the brake shoe and the brake drum is smaller than a proper value, the dragging phenomenon occurs, and the service life of the brake shoe is influenced.
Disclosure of Invention
The invention aims to provide a self-adjusting limiting device of a drum brake and a self-adjusting drum brake, which are used for solving the problems in the prior art, avoiding excessive adjustment of brake shoes, facilitating assembly and reducing cost.
The invention provides a self-adjustable drum brake, which comprises a brake bottom plate and two brake shoes, wherein the two brake shoes are respectively and rotatably fixed on the brake bottom plate, and the self-adjustable drum brake also comprises:
the self-adjusting limiting device comprises a shifting sheet, a self-adjusting ratchet component, a self-adjusting return spring and a limiting spring; the self-adjusting ratchet component comprises a self-adjusting threaded rod, a ratchet wheel and a sleeve; wherein,
two ends of the self-adjusting threaded rod are respectively fixedly connected with the two brake shoes, the sleeve is sleeved on the self-adjusting threaded rod and is in threaded connection with the self-adjusting threaded rod, and the ratchet wheel is fixed on the outer wall of the sleeve;
the shifting piece is fixed on one brake shoe piece;
the first end of the shifting piece is fixedly connected with the first end of the self-adjusting return spring, the second end of the shifting piece is matched with the ratchet on the ratchet wheel, and the second end of the self-adjusting return spring is fixed on the brake bottom plate;
the first end of the limiting spring is fixed on the brake shoe plate, and the second end of the limiting spring is fixedly connected with the shifting plate.
The drum brake with the self-adjustable function as described above, wherein preferably, a first protrusion is disposed on an inner side of the brake shoe, and a first end of the limiting spring is fixed to the first protrusion in a clamping manner.
The drum brake with the self-adjustable function as described above, wherein preferably, a second protrusion is provided on the dial plate, and the second end of the limiting spring is fixed to the second protrusion in a clamping manner.
The self-adjustable drum brake as described above, wherein preferably, the limiting spring is a conical spring, and the inner diameter of the first end of the limiting spring is larger than the inner diameter of the second end of the limiting spring.
The self-adjustable drum brake as described above, wherein preferably, the pick is provided with a reinforcing rib.
The self-adjustable drum brake as described above, wherein preferably, the reinforcing rib is integrally formed with the paddle.
The self-adjustable drum brake as described above, wherein preferably said pick is fixed to said brake shoe by a spacing pin.
The self-adjustable drum brake provided by the invention is supported between the brake shoe and the shifting piece by arranging the limiting spring, and when the brake shoe is subjected to self-adjustment after being worn, the limiting spring can limit the rotation of the shifting piece, so that the dragging phenomenon caused by excessive self-adjustment is prevented. Compared with the prior art, the structure of a push rod is eliminated, the assembly is simplified, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art self-tunable drum brake;
FIG. 2 is a schematic view of a part of a self-adjusting and limiting device of a drum brake in the prior art;
FIG. 3 is a schematic perspective view of a self-tunable drum brake according to an embodiment of the present invention;
FIG. 4 is a front view of a self-tunable drum brake provided by an embodiment of the present invention;
fig. 5 is a schematic structural view of an automatic adjusting and limiting device in an automatic adjustable drum brake according to an embodiment of the present invention.
Description of reference numerals:
in FIGS. 1-2:
100-self-adjustable drum brake 110-brake bottom plate 120-brake shoe 130-self-adjustable limiting device
131-shifting piece 132-push rod 133-self-adjusting return spring 134-self-adjusting threaded rod 135-sleeve
136-ratchet
In FIGS. 3-5:
200-self-adjustable drum brake 210-brake bottom plate 220-brake shoe 230-self-adjustable limiting device
231-shifting sheet 2311-reinforcing rib 232-limiting spring 233-self-adjusting return spring 234-self-adjusting threaded rod
235-sleeve 236-ratchet 237-limit pin
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Fig. 3 is a schematic perspective view of an automatically adjustable drum brake according to an embodiment of the present invention, and fig. 4 is a front view of an automatically adjustable drum brake according to an embodiment of the present invention.
As shown in fig. 3 and 4, an embodiment of the present invention provides an adaptive drum brake 100, which includes a brake base plate 210, two brake shoes 220, and an adaptive limiting device 230.
The two brake shoes 220 are respectively and rotatably fixed on the brake bottom plate, so that the two brake shoes 220 can be respectively spread towards two sides during braking, and friction is generated between the two brake shoes and the brake drum to generate braking.
Fig. 5 is a schematic structural diagram of an automatic adjustment limiting device in an automatic adjustable drum brake according to an embodiment of the present invention, and referring to fig. 3 and fig. 4, an automatic adjustment limiting device 230 includes a shifting block 231, an automatic adjustment ratchet assembly, an automatic adjustment return spring 233, and a limiting spring 232. The self-adjusting ratchet assembly includes a self-adjusting threaded rod 234, a ratchet 236, and a sleeve 235.
Two ends of the self-adjusting threaded rod 234 are respectively fixedly connected with the two brake shoes 220, and specifically, two ends of the self-adjusting threaded rod 234 may be respectively provided with a clamping groove, which is clamped with the brake shoes 220. The sleeve 235 is sleeved on the self-adjusting threaded rod 234 and is in threaded connection with the self-adjusting threaded rod 234, the ratchet 236 is fixed on the outer wall of the sleeve 235, the ratchet 236 can be integrally formed with the sleeve 235, and the ratchet 236 is provided with ratchet teeth.
The pick-up 231 is fixed to a brake shoe 220, and specifically, the pick-up 231 may be fixed to the brake shoe 220 by a spacing pin 237. When the brake shoes 220 are spread, they drive the shifting plate 231 to rotate together relative to the brake base plate 210. The first end of the shifting piece 231 is fixedly connected with the first end of the self-adjusting return spring 233, the second end of the shifting piece 231 is matched with the ratchet on the ratchet wheel 236, the second end of the self-adjusting return spring 233 is fixed on the brake bottom plate 210, and when the shifting piece 231 is spread outwards along with the brake shoe 220, the self-adjusting return spring 233 plays a role in pulling the shifting piece 231 to return. The first end of the limiting spring 232 is fixed on the brake shoe 220, and the second end of the limiting spring 232 is fixedly connected with the shifting piece 231. The self-adjusting return spring 233 has a certain inward pulling force on the shifting piece 231, and the limiting spring 232 pulls the shifting piece 231 outward to limit the shifting piece 231.
The self-adjusting return spring 233 is hooked between the pick 231 and a reinforcing fixing plate fixed to the brake spider 210 by bolts. The paddle 231 and brake spider 210 are connected together by a spacing pin 237 but are rotatable relative to the brake spider. The self-adjusting ratchet assembly is used for supporting the two brake shoes 220 and poking the ratchets through the poking piece 231 to perform clearance self-adjustment.
After the brake is normally used for a period of time, the brake shoe 220 is worn, the outer diameter of the brake shoe 220 is reduced, and the brake clearance between the brake shoe 220 and the brake drum is increased. When the clearance is increased, the stroke of the brake shoe 220 is expanded, namely, the amplitude is increased, when the brake is braked, the brake shoe 220 can drive the shifting piece 231 to be expanded outwards, at the moment, the self-adjusting return spring 233 can pull the shifting piece 231 to rotate around the limit pin 237, so that the shifting piece 231 drives the sleeve 235 and the ratchet 236 in the self-adjusting ratchet component to rotate, the thread stroke is increased between the sleeve 235 and the self-adjusting threaded rod 234, the amplitude of the brake shoe 220 which is expanded is increased, and the self-adjusting function is realized.
Because the push rod in the prior art is eliminated, the limiting spring 232 plays a limiting role in the self-adjusting process, and the dragging phenomenon caused by over-adjustment can be avoided.
Preferably, the inner side of the brake shoe 220 is provided with a first protrusion, and a first end of the limiting spring 232 is clamped and fixed with the first protrusion. The first end of the limiting spring 232 is sleeved on the first protrusion, and the limiting spring 232 is guaranteed to be clamped and fixed with the first protrusion by setting the size of the first protrusion.
Further, a second protrusion is arranged on the shifting piece 231, and a second end of the limiting spring 232 is clamped and fixed with the second protrusion. The second end of the limiting spring 232 is sleeved on the second protrusion, and the limiting spring 232 is clamped and fixed with the second protrusion by setting the size of the second protrusion.
On the basis of the above embodiment, it is preferable that the limiting spring 232 is a conical spring, and the inner diameter of the first end of the limiting spring 232 is larger than the inner diameter of the second end of the limiting spring 232, so that the bottom dimension of the conical spring on the side of the brake shoe 220 is larger than the top dimension of the conical spring on the side of the dial 231, and the setting of the limiting spring 232 as a conical shape facilitates the stable support of the limiting spring 232 between the brake shoe 220 and the dial 231.
In order to ensure the strength of the shifting block 231, a reinforcing rib 2311 may be provided on the shifting block 231, and the reinforcing rib 2311 may be integrally formed with the shifting block 231 by punching.
In the assembling process, the push rod in the prior art is omitted, so that the push rod does not need to be assembled inside the self-adjusting return spring for fixing, and only the limiting spring needs to be assembled, and the installation is convenient and reliable. Meanwhile, a push rod is omitted, and cost is reduced.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (5)
1. A self-adjustable drum brake, comprising a brake base plate and two brake shoes, wherein the two brake shoes are respectively and rotatably fixed on the brake base plate, the self-adjustable drum brake is characterized by further comprising:
the self-adjusting limiting device comprises a shifting sheet, a self-adjusting ratchet component, a self-adjusting return spring and a limiting spring; the self-adjusting ratchet component comprises a self-adjusting threaded rod, a ratchet wheel and a sleeve; wherein,
two ends of the self-adjusting threaded rod are respectively fixedly connected with the two brake shoes, the sleeve is sleeved on the self-adjusting threaded rod and is in threaded connection with the self-adjusting threaded rod, and the ratchet wheel is fixed on the outer wall of the sleeve;
the shifting piece is fixed on one brake shoe piece;
the first end of the shifting piece is fixedly connected with the first end of the self-adjusting return spring, the second end of the shifting piece is matched with the ratchet on the ratchet wheel, and the second end of the self-adjusting return spring is fixed on the brake bottom plate;
the first end of the limiting spring is fixed on the brake shoe plate, and the second end of the limiting spring is fixedly connected with the shifting plate; a first bulge is arranged on the inner side of the brake shoe, and a first end of the limiting spring is fixedly clamped with the first bulge; the poking piece is provided with a second protrusion, and the second end of the limiting spring is fixedly connected with the second protrusion in a clamping mode.
2. The self-tunable drum brake of claim 1, wherein the spacing spring is a conical spring and a first end inner diameter of the spacing spring is greater than a second end inner diameter of the spacing spring.
3. A self-adjustable drum brake according to claim 1, characterised in that said plectrum is provided with a reinforcement.
4. A self-adjustable drum brake according to claim 3, characterised in that said reinforcing ribs are formed integrally with said pick.
5. A self-adjustable drum brake according to any one of claims 1 to 4, in which said pick is secured to said brake shoe by a spacing pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510629292.XA CN105090299B (en) | 2015-09-28 | 2015-09-28 | Can self-regulated drum brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510629292.XA CN105090299B (en) | 2015-09-28 | 2015-09-28 | Can self-regulated drum brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105090299A CN105090299A (en) | 2015-11-25 |
| CN105090299B true CN105090299B (en) | 2017-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510629292.XA Expired - Fee Related CN105090299B (en) | 2015-09-28 | 2015-09-28 | Can self-regulated drum brake |
Country Status (1)
| Country | Link |
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| CN (1) | CN105090299B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115163707B (en) * | 2022-05-13 | 2023-10-10 | 柳州五菱汽车工业有限公司 | Adjusting tool and adjusting and detecting method of self-adjusting mechanism |
| CN115000877B (en) * | 2022-07-04 | 2023-12-01 | 淮阴工学院 | Cable maintenance manned self-obstacle avoidance sliding device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001317570A (en) * | 2000-05-02 | 2001-11-16 | Akebono Brake Ind Co Ltd | Drum brake device |
| CN200975431Y (en) * | 2006-08-28 | 2007-11-14 | 万安集团诸暨汽车零部件有限公司 | Vehicle braking gap adjusting arm arm assembly |
| KR20110060245A (en) * | 2009-11-30 | 2011-06-08 | 주식회사 만도 | Drum brake |
| CN201666320U (en) * | 2010-03-22 | 2010-12-08 | 潍坊金力机电有限公司 | Brake |
| CN101793297A (en) * | 2010-03-22 | 2010-08-04 | 潍坊金力机电有限公司 | Brake |
| KR20120088340A (en) * | 2011-01-31 | 2012-08-08 | 주식회사 만도 | Drum brake |
| CN202108903U (en) * | 2011-05-20 | 2012-01-11 | 上海华普汽车有限公司 | Drum brake |
| JP5271436B2 (en) * | 2012-04-25 | 2013-08-21 | 日信工業株式会社 | Drum brake for vehicles |
| CN204961648U (en) * | 2015-09-28 | 2016-01-13 | 安徽江淮汽车股份有限公司 | But self -modulation drum brake |
-
2015
- 2015-09-28 CN CN201510629292.XA patent/CN105090299B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN105090299A (en) | 2015-11-25 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| CB02 | Change of applicant information |
Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Applicant after: ANHUI JIANGHUAI AUTOMOBILE GROUP Corp.,Ltd. Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Applicant before: ANHUI JIANGHUAI AUTOMOBILE Co.,Ltd. |
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| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170929 |