CN212423368U - Drum brake device - Google Patents
Drum brake device Download PDFInfo
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- CN212423368U CN212423368U CN202021532757.2U CN202021532757U CN212423368U CN 212423368 U CN212423368 U CN 212423368U CN 202021532757 U CN202021532757 U CN 202021532757U CN 212423368 U CN212423368 U CN 212423368U
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- brake
- brake shoe
- positioning pin
- rotating shaft
- mounting hole
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Abstract
The utility model discloses a drum brake device, which is provided with a first positioning pin and a second positioning pin on a chassis, wherein one end of a first brake shoe is provided with a mounting hole which is in clearance fit with the first positioning pin, and one end of a second brake shoe is provided with a mounting hole which is in clearance fit with the second positioning pin; the central rotating shaft is rotatably arranged at the central position of the chassis and connected with the pull rod, the central part of the driving large arm is fixedly sleeved on the central rotating shaft, and two ends of the driving large arm are respectively connected with the brake shoe through the small arms. When braking, 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 positioning pin, 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 enlarged, the two brake shoes are further expanded, and a user can obtain a large braking effect under the condition of spending a small acting force.
Description
Technical Field
The utility model belongs to the technical field of electric bicycle, motorcycle braking, concretely relates to drum brake equipment.
Background
Traditional electric bicycle or bicycle drum brake usually by the chassis, two brake shoes, reset spring and a pull rod are constituteed, two brake shoes are installed on the chassis through the locating pin relatively, reset spring connects between two brake shoes, for it provides closed restoring force, set up a platelike between the action end of two brake shoes and dial the turn round, should dial the turn round and be connected with the head end of pull rod, when the tail end of brake line pulling pull rod, the pull rod drives the turn round rotation of dialling of its head end, and then dial the turn round can drive two brake shoes and rise to open, realize the braking action. According to the traditional drum brake device, as the plate-shaped shifting knob is adopted to drive the two brake shoes simultaneously, the shifting knob can be driven to rotate only by a large force, so that the brake hand feeling of a user is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a drum brake device.
The utility model discloses a realize through following technical scheme:
a drum brake device comprises a chassis, a first brake shoe, a second brake shoe, a return 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 positioning pin and a second positioning 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 which is used for being in 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 in clearance fit with the second positioning pin, and the mounting hole is sleeved on the second positioning 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 center 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 closing restoring force is provided for the two brake shoes through the return spring.
In the technical scheme, the inner diameter of the mounting hole which is arranged on the first brake shoe and used for being in clearance fit with the first positioning pin is 3-5mm larger than the diameter of the first positioning pin.
In the technical scheme, the inner diameter of the mounting hole which is arranged on the second brake shoe and is in clearance fit with the second positioning pin is 3-5mm larger than the diameter of the second positioning pin.
In the technical scheme, the central part of the driving large arm is provided with a mounting hole, and the mounting hole is sleeved on the central rotating shaft through a key and a key groove.
In the above technical scheme, the number of the return springs is two, wherein one of the return springs is arranged on one side close to the first positioning pin, and the other return spring is arranged on one side close to the second positioning pin.
In the above-described aspect, friction linings are provided on the outer side of the first brake shoe and the outer side of the second brake shoe, respectively.
In the above technical scheme, the central part of the chassis is provided with a shaft hole for mounting the central rotating shaft.
In the technical scheme, 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.
In the technical scheme, the tail end of the pull rod is provided with the brake cable positioning installation part, during use, the steel wire end of the brake cable is fixed on the installation part at the tail end of the pull rod, the outer skin of the brake cable is fixed on the brake cable positioning installation 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 the support arm, so that the central rotating shaft rotates.
The utility model discloses an advantage and beneficial effect do:
the steel wire of a brake cable is pulled, the pull rod is pulled by the steel wire to be clamped 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 big arm to rotate, the driving big arm drives the first brake shoe and the second brake shoe to expand through the first small arm and the second small arm, the first brake shoe and the second brake shoe can be contacted with the inner wall of the brake drum after expanding, the brake drum can enable the first brake shoe and the second brake shoe to generate a trend of forward rotation motion along the wheel under the action of friction force, and a certain movable gap is reserved between the first brake shoe and the second brake shoe as well as between the first positioning pin and the second positioning pin, so that the first brake shoe and the second brake shoe can be driven to move for a certain distance along the forward rotation direction of the wheel under the action of the friction force of the brake drum, and the first small arm and the second small arm can be respectively driven to move by the first brake shoe and the second brake shoe during the, the included angle between the first small arm and the driving large arm is enlarged, and the included angle between the second small arm and the driving large arm is continuously enlarged, so that the first brake shoe and the second brake shoe are further expanded, and a user can obtain a large braking effect under the condition of spending small acting force.
Drawings
Fig. 1 is a front view of a drum brake device according to the present invention.
Fig. 2 is a back view of the drum brake apparatus of the present invention.
Fig. 3 is a view of the drum brake assembly of the present invention with the first brake shoe removed.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the 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 shaft 5, a large actuating arm 6 fixedly mounted on the central shaft, and a first small arm 7 for connecting the first brake shoe 2 and a second small arm 8 for connecting the second brake shoe 3.
The inner side of the chassis 1 is embedded with a first positioning pin 9 and a second positioning pin 10 which 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 which is used for being in 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; and 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 central rotating shaft 5 is rotatably installed at the central position of the chassis 1, the outer end of the central rotating shaft 5 penetrates through the chassis 1 to be connected with the top end of the pull rod 11 at the back 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 central rotating shaft 5 to rotate.
The center part of the driving large arm 6 is fixedly sleeved on the central rotating shaft 5 (the center part of the driving large arm is provided with a mounting hole which is sleeved on the central rotating shaft 5 through a key and a key slot), 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 provided between the first brake shoe 2 and the second brake shoe 3 (i.e., both ends of the return spring 4 are connected to the first brake shoe 2 and the second brake shoe 3, respectively), and closing restoring force is provided to both brake shoes by 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, friction linings are provided on the outer side of the first brake shoe 2 and the outer side of the second brake shoe 3, respectively.
Further, the central portion of the chassis 1 is provided with a shaft hole for installing the central rotating shaft 5.
Furthermore, the side part of the chassis 1 is provided with a support arm 1-1, and the support arm is provided with a bolt mounting hole 1-11 and a brake cable positioning mounting hole 1-12.
Furthermore, the tail end of the pull rod 11 is provided with a brake cable positioning installation part, when in use, the steel wire end of the brake cable is fixed on the installation part at the tail end of the pull rod, the outer skin of the brake cable is fixed on the brake cable positioning installation holes 1-12 on the support arm 1-1, when 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, and then the central rotating shaft rotates.
The using method and the working principle of the device are as follows:
the steel wire of the brake cable is pulled, the pull rod is pulled by the steel wire to be clamped 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 expand 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 enlarged, the included angle between the second small arm and the driving large arm is enlarged, 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 enlarged, so that the first brake shoe 2 and the second brake shoe 3 are expanded outwards, the first brake shoe 2 and the second brake shoe 3 can be contacted with the inner wall of the brake drum (the brake drum rotates along with the wheel) after expanding, and the brake drum can enable the first brake shoe 2 and the second brake shoe 3 to generate the trend of rotating along the forward direction of the wheel (clockwise direction in the drawing) under the, because certain movable gaps are 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 for a certain distance along the forward rotation direction of the wheel under the action of friction force of a brake drum, the first small arm and the second small arm can be respectively driven by the first brake shoe 2 and the second brake shoe 3 to move in the moving process, so that 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, the first brake shoe 2 and the second brake shoe 3 are further expanded, and a user can obtain a large brake effect under the condition of consuming small acting force.
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 as 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 "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (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 invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.
Claims (9)
1. A drum brake device characterized in that: the brake comprises a chassis, a first brake shoe, a second brake shoe, a return 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 positioning pin and a second positioning 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 which is used for being in 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 in clearance fit with the second positioning pin, and the mounting hole is sleeved on the second positioning 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 center 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 closing restoring force is provided for the two brake shoes through the return spring.
2. The drum brake assembly as set forth in claim 1, wherein: the inner diameter of the mounting hole which is arranged on the first brake shoe and used for being in clearance fit with the first positioning pin is 3-5mm larger than the diameter of the first positioning pin.
3. The drum brake assembly as set forth in claim 1, wherein: the inner diameter of the mounting hole which is arranged on the second brake shoe and used for being in clearance fit with the second positioning pin is 3-5mm larger than the diameter of the second positioning pin.
4. The drum brake assembly as set forth in claim 1, wherein: the center part of the driving large arm is provided with a mounting hole which is sleeved on the central rotating shaft through a key and a key groove.
5. The drum brake assembly as set forth in claim 1, wherein: the quantity of reset spring is two, and one of them sets up in being close to first locating pin one side, and another sets up in being close to second locating pin one side.
6. The drum brake assembly as set forth in claim 1, wherein: friction linings are respectively arranged on the outer side of the first brake shoe and the outer side of the second brake shoe.
7. The drum brake assembly as set forth in claim 1, wherein: the central part of the chassis is provided with a shaft hole for installing the central rotating shaft.
8. The drum brake assembly as set forth in claim 1, wherein: 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.
9. The drum brake assembly as set forth in claim 8, wherein: the tail end of the pull rod is provided with a brake cable positioning installation part, a steel wire end of the brake cable is fixed on the installation part at the tail end of the pull rod, and a sheath of the brake cable is fixed on a brake cable positioning installation hole on the support arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021532757.2U CN212423368U (en) | 2020-07-29 | 2020-07-29 | Drum brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021532757.2U CN212423368U (en) | 2020-07-29 | 2020-07-29 | Drum brake device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212423368U true CN212423368U (en) | 2021-01-29 |
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ID=74274249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021532757.2U Active CN212423368U (en) | 2020-07-29 | 2020-07-29 | Drum brake device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212423368U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731430A (en) * | 2020-07-29 | 2020-10-02 | 天津美派电动科技有限公司 | Drum brake device |
-
2020
- 2020-07-29 CN CN202021532757.2U patent/CN212423368U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111731430A (en) * | 2020-07-29 | 2020-10-02 | 天津美派电动科技有限公司 | Drum brake device |
| CN111731430B (en) * | 2020-07-29 | 2024-04-30 | 天津美派电动科技有限公司 | Drum brake device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230215 Address after: No. 6, Wanxing Road, Chenzui Town, Wuqing District, Tianjin, 301741 Patentee after: Tianjin Bendou Technology Co.,Ltd. Address before: No. 492, Meishi Road, chenzui Town, Wuqing District, Tianjin Patentee before: TIANJIN MEIPAI ELECTRIC TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |