CN111731430B - Drum brake device - Google Patents
Drum brake device Download PDFInfo
- Publication number
- CN111731430B CN111731430B CN202010746688.3A CN202010746688A CN111731430B CN 111731430 B CN111731430 B CN 111731430B CN 202010746688 A CN202010746688 A CN 202010746688A CN 111731430 B CN111731430 B CN 111731430B
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- CN
- China
- Prior art keywords
- brake
- brake shoe
- rotating shaft
- mounting hole
- locating pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 210000000245 forearm Anatomy 0.000 description 8
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
- B62L1/00—Brakes; Arrangements thereof
- B62L1/02—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
- B62L3/00—Brake-actuating mechanisms; Arrangements thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a drum brake device, wherein a first locating pin and a second locating pin are embedded in the inner side of a chassis, one end of a first brake shoe is provided with a mounting hole for clearance fit with the first locating pin, and one end of a second brake shoe is provided with a mounting hole for clearance fit with the second locating pin; the center rotating shaft is rotatably arranged at the center position of the chassis, the center rotating shaft is connected with the pull rod, the center part of the driving large arm is fixedly sleeved on the center rotating shaft, and two ends of the driving large arm are respectively connected with the brake shoes through the small arms. When the brake is applied, the pull rod drives the central rotating shaft to rotate, the central rotating shaft drives the driving large arm, and a certain movable gap is reserved between the brake shoes and the locating pins, so that the brake drum can drive the two brake shoes to move for a certain distance along the forward rotating direction of the wheel under the action of friction force, the included angle between the small arm and the driving large arm is increased, the two brake shoes are promoted to further expand, and a user can obtain a larger braking effect under the condition of spending smaller acting force.
Description
Technical Field
The invention belongs to the technical field of braking of electric bicycles, bicycles and motorcycles, and particularly relates to a drum brake device.
Background
The traditional electric bicycle or bicycle drum brake device is generally composed of a chassis, two brake shoes, a reset spring and a pull rod, wherein the two brake shoes are relatively arranged on the chassis through positioning pins, the reset spring is connected between the two brake shoes and provides a closing reset force for the two brake shoes, a platy poking button is arranged between action ends of the two brake shoes and is connected with the head end of the pull rod, when a brake cable pulls the tail end of the pull rod, the pull rod drives the poking button at the head end of the pull rod to rotate, and then the poking button drives the two brake shoes to expand, so that braking action is realized. Because the traditional drum brake device adopts a plate-shaped shifting knob to drive two brake shoes simultaneously, a large force is required to drive the shifting knob to rotate, so that the braking hand feeling of a user is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a drum brake device.
The invention is realized by the following technical scheme:
a drum brake device comprises a chassis, a first brake shoe, a second brake shoe, a reset spring, a central rotating shaft, a driving large arm fixedly arranged on the central rotating shaft, a first small arm used for connecting the first brake shoe and a second small arm used for connecting the second brake shoe;
a first locating pin and a second locating pin are embedded in the inner side of the chassis, and are symmetrically arranged by taking the central rotating shaft as a center;
The first brake shoe and the second brake shoe are oppositely arranged, one end of the first brake shoe is provided with a mounting hole for clearance fit with the first positioning pin, and the mounting hole is sleeved on the first positioning pin; one end of the second brake shoe is provided with a mounting hole which is used for being in clearance fit with the second locating pin, and the mounting hole is sleeved on the second locating pin;
The central rotating shaft is rotatably arranged at the central position of the chassis, and the outer end of the central rotating shaft penetrates through the chassis to be connected with the top end of the pull rod on the back of the chassis; the central part of the driving large arm is fixedly sleeved on the central rotating shaft, one end of the first small arm is hinged with one end of the driving large arm through a pin shaft, and the other end of the first small arm is hinged with the first brake shoe through a pin shaft; one end of the second small arm is hinged with the other end of the driving large arm through a pin shaft, and the other end of the second small arm is hinged with the second brake shoe through a pin shaft;
And a return spring is arranged between the first brake shoe and the second brake shoe, and the two brake shoes are provided with closing restoring force through the return spring.
In the technical scheme, the inner diameter of the mounting hole on the first brake shoe for clearance fit with the first locating pin is 3-5mm larger than the diameter of the first locating pin.
In the technical scheme, the inner diameter of the mounting hole on the second brake shoe for clearance fit with the second locating pin is 3-5mm larger than the diameter of the second locating pin.
In the technical scheme, the central part of the driving large arm is provided with the mounting hole, and the mounting hole is sleeved on the central rotating shaft through the key and the key groove.
In the above technical solution, the number of the return springs is two, one of which is disposed at a side close to the first positioning pin, and the other of which is disposed at a side close to the second positioning pin.
In the above technical scheme, the outer side of the first brake shoe and the outer side of the second brake shoe are respectively provided with friction linings.
In the technical scheme, the central part of the chassis is provided with the shaft hole for installing the central rotating shaft.
In the technical scheme, the side part of the chassis is provided with the support arm, and the support arm is provided with the bolt mounting hole and the brake cable positioning mounting hole.
In the technical scheme, the tail end of the pull rod is provided with the brake cable positioning and mounting part, when the brake cable is used, the steel wire end of the brake cable is fixed on the mounting part of the tail end of the pull rod, the outer skin of the brake cable is fixed on the brake cable positioning and mounting hole on the support arm, and when the steel wire of the brake cable is pulled, the steel wire pulls the pull rod to clamp towards the support arm, and then the central rotating shaft rotates.
The invention has the advantages and beneficial effects that:
The steel wire of pulling brake cable, the steel wire pulling pull rod presss from both sides tightly to the support arm direction, and then the pull rod drives the center pivot and rotates, the center pivot synchronous drive big arm rotates, drive big arm passes through first forearm and second forearm drive first brake shoe and second brake shoe and rises, first brake shoe and second brake shoe can contact with the brake drum inner wall after rising, and then the brake drum can make first brake shoe and second brake shoe produce the trend along wheel forward rotation motion under the effect of frictional force, because certain clearance is left between first brake shoe and second brake shoe and first locating pin and the second locating pin, therefore, can drive first brake shoe and second brake shoe and move certain distance along wheel forward rotation direction under the effect of brake drum frictional force, first brake shoe and second brake shoe can drive first forearm and second forearm motion respectively, make the contained angle between first forearm and the drive big arm grow and the contained angle between second forearm and continue to grow, thereby make first brake shoe and second brake shoe expand and further the brake effect that can obtain under the circumstances of great effort of the user under the effect of pulling.
Drawings
Fig. 1 is a front view of a drum brake assembly of the present invention.
Fig. 2 is a rear view of the drum brake assembly of the present invention.
FIG. 3 is a view of the drum brake assembly of the present invention with the first brake shoe removed.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the person skilled in the art better understand the solution of the present invention, the following describes the solution of the present invention with reference to specific embodiments.
Referring to the drawings, a drum brake assembly comprises a chassis 1, a first brake shoe 2, a second brake shoe 3, a return spring 4, a central spindle 5, a drive boom 6 fixedly mounted on the central spindle, and a first forearm 7 for connecting the first brake shoe 2 and a second forearm 8 for connecting the second brake shoe 3.
A first positioning pin 9 and a second positioning pin 10 are embedded in the inner side of the chassis 1, and are symmetrically arranged by taking the central rotating shaft 5 as a center.
The first brake shoe 2 and the second brake shoe 3 are oppositely arranged, one end of the first brake shoe 2 is provided with a mounting hole for clearance fit with the first positioning pin 9, the inner diameter of the mounting hole is 3-5mm larger than the diameter of the first positioning pin 9, and the mounting hole is sleeved on the first positioning pin 9; one end of the second brake shoe 3 is provided with a mounting hole for clearance fit with the second positioning pin 10, the inner diameter of the mounting hole is 3-5mm larger than the diameter of the second positioning pin, and the mounting hole is sleeved on the second positioning pin 10.
The center rotating shaft 5 is rotatably arranged at the center position of the chassis 1, the outer end of the center rotating shaft 5 penetrates through the chassis 1 and is connected with the top end of a pull rod 11 on the back surface of the chassis, the tail end of the pull rod 11 is used for being connected with a steel wire end of a brake cable, the pull rod is pulled through the steel wire, and then the pull rod drives the center rotating shaft 5 to rotate.
The center part of the driving large arm 6 is fixedly sleeved on the center rotating shaft 5 (the center part of the driving large arm is provided with a mounting hole which is sleeved on the center rotating shaft 5 through a key and a key groove), one end of the first small arm 7 is hinged with one end of the driving large arm 6 through a pin shaft, and the other end of the first small arm is hinged with the first brake shoe 1 through a pin shaft; one end of the second small arm 8 is hinged with the other end of the driving large arm 6 through a pin shaft, and the other end of the second small arm 8 is hinged with the second brake shoe 3 through a pin shaft.
A return spring 4 is arranged between the first brake shoe 2 and the second brake shoe 3 (namely, two ends of the return spring 4 are respectively connected with the first brake shoe 2 and the second brake shoe 3), and the two brake shoes are provided with closing return force through the return spring.
Further, the number of the return springs 4 is two, one of which is disposed on the side close to the first positioning pin 9 and the other of which is disposed on the side close to the second positioning pin 10.
Further, the outer side of the first brake shoe 2 and the outer side of the second brake shoe 3 are provided with friction linings, respectively.
Further, a shaft hole for installing the central rotating shaft 5 is arranged at the central part of the chassis 1.
Further, a support arm 1-1 is arranged on the side part of the chassis 1, and a bolt mounting hole 1-11 and a brake cable positioning mounting hole 1-12 are arranged on the support arm.
Further, the tail end of the pull rod 11 is provided with a brake cable positioning and mounting part, when in use, the steel wire end of the brake cable is fixed on the mounting part of the tail end of the pull rod, the outer skin of the brake cable is fixed on the brake cable positioning and mounting hole 1-12 on the support arm 1-1, and when the steel wire of the brake cable is pulled, the steel wire pulls the pull rod to clamp towards the support arm direction, and then the central rotating shaft rotates.
The application method and the working principle of the device are as follows:
The steel wire of the brake cable is pulled, the steel wire pulls the pull rod to clamp towards the direction of the support arm, the pull rod drives the central rotating shaft to rotate, the central rotating shaft synchronously drives the driving large arm to rotate, the driving large arm drives the first brake shoe 2 and the second brake shoe 3 to open through the first small arm 7 and the second small arm 8 (at the moment, the included angle between the first small arm and the driving large arm is increased, the included angle between the second small arm and the driving large arm is increased, namely, the distance between the hinge point of the first small arm and the first brake shoe 2 and the distance between the hinge point of the second small arm and the second brake shoe 3 and the central rotating shaft are increased, so that the first brake shoe 2 and the second brake shoe 3 are outwards opened, the first brake shoe 2 and the second brake shoe 3 are contacted with the inner wall of the brake drum after being opened (the brake drum rotates along with the wheels), the brake drum can further lead the first brake shoe 2 and the second brake shoe 3 to generate a trend of moving along the forward rotation direction (clockwise direction in the figure) of the wheel under the action of friction force, and as a certain clearance is reserved between the first brake shoe 2 and the second brake shoe 3 and between the first positioning pin 9 and the second positioning pin 10, the first brake shoe 2 and the second brake shoe 3 can be driven to move along the forward rotation direction of the wheel for a certain distance under the action of the friction force of the brake drum, the first brake shoe 2 and the second brake shoe 3 respectively drive the first small arm and the second small arm to move during the movement, the included angle between the first small arm and the driving large arm is increased, the included angle between the second small arm and the driving large arm is continuously increased, thereby further expanding the first brake shoe 2 and the second brake shoe 3, thus, a user can obtain a larger braking effect with smaller effort.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature's illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "under" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "lower" may encompass both an upper and lower orientation. The device may be otherwise positioned (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (3)
1. A drum brake assembly, characterized in that: the brake comprises a chassis, a first brake shoe, a second brake shoe, a reset spring, a central rotating shaft, a driving large arm fixedly arranged on the central rotating shaft, a first small arm used for connecting the first brake shoe and a second small arm used for connecting the second brake shoe;
a first locating pin and a second locating pin are embedded in the inner side of the chassis, and are symmetrically arranged by taking the central rotating shaft as a center;
The first brake shoe and the second brake shoe are oppositely arranged, a first mounting hole for clearance fit with a first positioning pin is formed in one end of the first brake shoe, and the first mounting hole is sleeved on the first positioning pin; one end of the second brake shoe is provided with a second mounting hole which is used for being in clearance fit with a second locating pin, and the second mounting hole is sleeved on the second locating pin;
The central rotating shaft is rotatably arranged at the central position of the chassis, and the outer end of the central rotating shaft penetrates through the chassis to be connected with the top end of the pull rod on the back of the chassis; the central part of the driving large arm is fixedly sleeved on the central rotating shaft, one end of the first small arm is hinged with one end of the driving large arm through a pin shaft, and the other end of the first small arm is hinged with the first brake shoe through a pin shaft; one end of the second small arm is hinged with the other end of the driving large arm through a pin shaft, and the other end of the second small arm is hinged with the second brake shoe through a pin shaft;
a return spring is arranged between the first brake shoe and the second brake shoe, and a closing restoring force is provided for the two brake shoes through the return spring;
the inner diameter of a first mounting hole on the first brake shoe for clearance fit with the first locating pin is 3-5mm larger than the diameter of the first locating pin;
the inner diameter of a second mounting hole on the second brake shoe for clearance fit with the second locating pin is 3-5mm larger than the diameter of the second locating pin;
a third mounting hole is formed in the center of the driving large arm and sleeved on the central rotating shaft through a key and a key groove;
the central part of the chassis is provided with a shaft hole for installing the central rotating shaft;
The side part of the chassis is provided with a support arm, and the support arm is provided with a bolt mounting hole and a brake cable positioning mounting hole;
the tail end of the pull rod is provided with a brake cable positioning and mounting part, the steel wire end of the brake cable is fixed on the mounting part at the tail end of the pull rod, and the outer skin of the brake cable is fixed on the brake cable positioning and mounting hole on the support arm.
2. The drum brake assembly according to claim 1, wherein: the number of the reset springs is two, one is arranged on one side close to the first locating pin, and the other is arranged on one side close to the second locating pin.
3. The drum brake assembly according to claim 1, wherein: the outer side of the first brake shoe and the outer side of the second brake shoe are respectively provided with friction linings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010746688.3A CN111731430B (en) | 2020-07-29 | 2020-07-29 | Drum brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010746688.3A CN111731430B (en) | 2020-07-29 | 2020-07-29 | Drum brake device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111731430A CN111731430A (en) | 2020-10-02 |
| CN111731430B true CN111731430B (en) | 2024-04-30 |
Family
ID=72656568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010746688.3A Active CN111731430B (en) | 2020-07-29 | 2020-07-29 | Drum brake device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111731430B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112519727B (en) * | 2020-11-27 | 2022-04-19 | 浙江夏厦精密制造股份有限公司 | Electric bus intelligent braking system with cam nut structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238962A (en) * | 1994-02-28 | 1995-09-12 | Nisshinbo Ind Inc | Mechanical drum brake device |
| CN2250889Y (en) * | 1995-12-14 | 1997-04-02 | 张万川 | Double pushing rod direct-movement expanding brake for truck |
| EP1389695A2 (en) * | 2002-08-16 | 2004-02-18 | Yamaha Hatsudoki Kabushiki Kaisha | Drum brake |
| CN107061552A (en) * | 2017-05-18 | 2017-08-18 | 江苏恒力制动器制造有限公司 | A kind of lever drum brake |
| CN110454520A (en) * | 2019-07-22 | 2019-11-15 | 高邮市顺达动力机电有限公司 | A kind of novel three brake-shoes drum brake mechanism |
| CN111365385A (en) * | 2020-06-01 | 2020-07-03 | 莱州伟辰汽车配件有限公司 | Drum brake disc with multiple brake shoes |
| CN212423368U (en) * | 2020-07-29 | 2021-01-29 | 天津美派电动科技有限公司 | Drum brake device |
-
2020
- 2020-07-29 CN CN202010746688.3A patent/CN111731430B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238962A (en) * | 1994-02-28 | 1995-09-12 | Nisshinbo Ind Inc | Mechanical drum brake device |
| CN2250889Y (en) * | 1995-12-14 | 1997-04-02 | 张万川 | Double pushing rod direct-movement expanding brake for truck |
| EP1389695A2 (en) * | 2002-08-16 | 2004-02-18 | Yamaha Hatsudoki Kabushiki Kaisha | Drum brake |
| CN107061552A (en) * | 2017-05-18 | 2017-08-18 | 江苏恒力制动器制造有限公司 | A kind of lever drum brake |
| CN110454520A (en) * | 2019-07-22 | 2019-11-15 | 高邮市顺达动力机电有限公司 | A kind of novel three brake-shoes drum brake mechanism |
| CN111365385A (en) * | 2020-06-01 | 2020-07-03 | 莱州伟辰汽车配件有限公司 | Drum brake disc with multiple brake shoes |
| CN212423368U (en) * | 2020-07-29 | 2021-01-29 | 天津美派电动科技有限公司 | Drum brake device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111731430A (en) | 2020-10-02 |
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