CN212028385U - Drum brake device - Google Patents
Drum brake device Download PDFInfo
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- CN212028385U CN212028385U CN202020771503.XU CN202020771503U CN212028385U CN 212028385 U CN212028385 U CN 212028385U CN 202020771503 U CN202020771503 U CN 202020771503U CN 212028385 U CN212028385 U CN 212028385U
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- pull rod
- driving piece
- brake shoe
- brake
- mounting hole
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Abstract
The utility model discloses a drum brake device, which adopts two pull rods which are arranged in a scissor mode, the head end of the first pull rod is connected with a first driving piece for driving a first brake shoe, and the head end of the second pull rod is connected with a second driving piece for driving a second brake shoe; the force bearing point position is arranged between the two pull rods and is close to the head end position of the pull rod, when the two pull rods are clamped inwards and closed, the force bearing point position serves as a fulcrum, the pull rod is equivalent to a lever at the moment, the tail end of the pull rod serves as a power action point, the head end driving piece of the pull rod serves as a resistance point, and the force bearing point position is close to the head end position of the pull rod, so that the power arm is larger than the resistance arm, the lever is a labor-saving lever, and a user can drive the brake shoe to expand under the condition of spending of small acting force.
Description
Technical Field
The utility model belongs to the technical field of electric bicycle or bicycle braking, concretely relates to drum brake device.
Background
Referring to fig. 1, a conventional drum brake device for an electric bicycle or a bicycle generally includes a chassis a, two brake shoes b, a return spring e and a pull rod c, wherein the two brake shoes are relatively mounted on the chassis through positioning pins, the return spring is connected between the two brake shoes to provide a closing restoring force, a plate-shaped toggle button d is disposed between actuating ends of the two brake shoes and connected to a head end of the pull rod, and when a brake cable pulls a tail end of the pull rod, the pull rod drives the toggle button at the head end to rotate, and the toggle button drives the two brake shoes to expand and separate, thereby implementing a braking action. According to the drum brake device, the plate-shaped shifting knob is adopted to drive the two brake shoes simultaneously, so that a large initial force is required to drive the shifting knob to rotate, and 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 first pull rod and a second pull rod;
the first brake shoe and the second brake shoe are mounted on the chassis through limit pins, and a return spring is arranged between the first brake shoe and the second brake shoe;
the first pull rod and the second pull rod are arranged in a scissor mode, the head end of the first pull rod is connected with a first driving piece used for driving a first brake shoe, and the head end of the second pull rod is connected with a second driving piece used for driving a second brake shoe; and a bearing point position is arranged between the first pull rod and the second pull rod and is close to the head end position of the pull rod.
In the technical scheme, the distance between the bearing point and the head end of the pull rod accounts for 1/5-1/6 of the length of the whole pull rod.
In the technical scheme, one end of the first brake shoe is provided with a mounting hole matched with the first driving piece, the mounting hole is a semicircular opening hole, the first driving piece is in a semicircular column shape, the first driving piece is mounted in the mounting hole of the first brake shoe, and the first driving piece form circular arc sliding fit; one end of the second brake shoe is provided with a mounting hole matched with the second driving piece, the mounting hole is a semicircular opening hole, the second driving piece is in a semicircular column shape, the second driving piece is mounted in the mounting hole of the second brake shoe, and the second driving piece form circular arc sliding fit.
In the above technical scheme, the first pull rod and the second pull rod are located on the outer side surface of the chassis, through holes for installing the first driving piece and the second driving piece are formed in the chassis, and the first driving piece and the second driving piece penetrate through the through holes.
In the technical scheme, the outer side surface of the chassis is provided with a buckle cover for mounting the first pull rod and the second pull rod, and the head parts of the first pull rod and the second pull rod are mounted in the buckle cover.
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 limit pin, and the other return spring is arranged on one side close to the driving piece.
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 main shaft.
In the technical scheme, the base plate 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 above technical scheme, the tail end of the first pull rod and the tail end of the second pull rod are respectively provided with a brake cable positioning installation part.
In the technical scheme, the force bearing point position is formed by arranging an arc protrusion on the first pull rod, arranging an arc groove on the second pull rod and installing the arc protrusion in the arc groove.
In the technical scheme, the force bearing point position is specifically structured in such a way that a gear is arranged on the first pull rod, a tooth groove is arranged on the second pull rod, and the gear is matched with the tooth groove to form the force bearing point position.
The utility model discloses an advantage and beneficial effect do:
the utility model adopts two pull rods which are arranged in a scissor manner, the head end of the first pull rod is connected with a first driving piece for driving a first brake shoe, and the head end of the second pull rod is connected with a second driving piece for driving a second brake shoe; the force bearing point position is arranged between the two pull rods and is close to the head end position of the pull rod, when the two pull rods are clamped inwards and closed, the force bearing point position serves as a fulcrum, the pull rod is equivalent to a lever at the moment, the tail end of the pull rod serves as a power action point, the head end driving piece of the pull rod serves as a resistance point, and the force bearing point position (namely the fulcrum) is close to the head end position of the pull rod, so that the power arm is larger than the resistance arm, the lever serves as a labor-saving lever, and a user can drive the brake shoe to expand and open under the condition of low cost acting force.
Drawings
Fig. 1 is a schematic view of a structure of a related art drum brake device.
Fig. 2 is a front view of the drum brake device of the present invention.
Fig. 3 is a back view of the drum brake assembly of the present invention.
Fig. 4 is a back view of the drum brake assembly of the present invention (with the locking cover removed).
Fig. 5 is a schematic structural view of the force bearing point of the drum brake apparatus of the present invention.
Fig. 6 is a schematic structural view of the force bearing point of the drum brake apparatus of the present invention.
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 fig. 2 to 4, a drum brake assembly includes a chassis 1, a first brake shoe 2, a second brake shoe 3, a return spring 4, a first tie rod 5 and a second tie rod 6.
The first brake shoe 2 and the second brake shoe 3 are arranged oppositely, one end of the first brake shoe and one end of the second brake shoe are installed on the chassis 1 through a limiting pin 7, a return spring 4 is arranged between the first brake shoe and the second brake shoe (namely, two ends of the return spring 4 are respectively connected with the first brake shoe 2 and the second brake shoe 3), and closing restoring force is provided for the two brake shoes through the return spring.
The first pull rod 5 and the second pull rod 6 are arranged in a scissor mode, the head end of the first pull rod is connected with a first driving piece 5-1 used for driving a first brake shoe, and the head end of the second pull rod is connected with a second driving piece 6-1 used for driving a second brake shoe; a force bearing point 8 is arranged between the first pull rod and the second pull rod, the force bearing point 8 is close to the head end position of the pull rod, preferably, the distance between the force bearing point 8 and the head end of the pull rod accounts for 1/5-1/6 of the length of the whole pull rod, when the tail ends of the first pull rod and the second pull rod are clamped inwards and closed, the force bearing point 8 serves as a fulcrum, the pull rod is equivalent to a lever at the moment, the tail end of the pull rod serves as a power action point, a head end driving piece of the pull rod serves as a resistance point, and the force bearing point (i.e., the fulcrum) is close to the head end position of the pull rod, so that the power arm is larger than the resistance arm, the lever is a labor-saving lever, and a user can drive the first brake shoe and the second brake shoe to expand and.
Further, the specific structure of the force bearing point 8 may be: referring to the attached figure 5, the first pull rod is provided with an arc protrusion 8-1, the second pull rod is provided with an arc groove 8-2, and the arc protrusion is arranged in the arc groove to form a force bearing point.
Further, the specific structure of the force bearing point 8 may also be: referring to the attached figure 6, a gear 8-3 is arranged on the first pull rod, a tooth groove 8-4 is arranged on the second pull rod, and the gear is matched with the tooth groove to form a force bearing point. This configuration ensures the synchronous movement of the first and second tie rods 5 and 6.
Furthermore, one end of the first brake shoe 2 is provided with a mounting hole used for being matched with the first driving piece, the mounting hole is a semicircular opening hole, the first driving piece 5-1 is in a semicircular column shape, the first driving piece is mounted in the mounting hole of the first brake shoe, and the first driving piece form circular arc sliding fit; similarly, one end of the second brake shoe is provided with a mounting hole matched with the second driving piece, the mounting hole is a semicircular opening hole, the second driving piece 6-1 is in a semicircular column shape, the second driving piece is mounted in the mounting hole of the second brake shoe, and the second driving piece form circular arc sliding fit.
Furthermore, the first pull rod 5 and the second pull rod 6 are located on the outer side surface of the chassis, through holes for mounting the first driving piece and the second driving piece are formed in the chassis, and the first driving piece 5-1 and the second driving piece 6-1 penetrate through the through holes.
Furthermore, a buckle cover 9 for installing the first pull rod and the second pull rod is arranged on the outer side surface of the chassis, and head parts of the first pull rod and the second pull rod are installed in the buckle cover 9.
Furthermore, the number of the return springs 4 is two, one of the return springs is arranged on the side close to the limit pin 7, and the other return spring is arranged on the side close to the driving member.
Further, friction linings are respectively arranged on the outer side of the first brake shoe and the outer side of the second brake shoe.
Furthermore, the central part of the chassis is provided with a shaft hole 1-1 for installing the main shaft.
Furthermore, a support arm 1-2 is arranged on the chassis, and a bolt mounting hole 1-21 and a brake cable positioning mounting hole 1-22 are arranged on the support arm.
Furthermore, the tail end of the first pull rod and the tail end of the second pull rod are respectively provided with a brake cable positioning installation part, when the brake cable brake device is used, the steel wire end of the brake cable is fixed on the installation part at the tail end of the first pull rod 5, the outer skin of the brake cable is fixed on the installation part at the tail end of the second pull rod 6, and a brake cable allowance with a certain length is reserved between the brake cable positioning installation part at the tail end of the second pull rod 6 and the brake cable positioning installation holes 1-22 on the support arm, so that when the steel wire of the brake cable is pulled, the first pull rod and the second pull rod can be clamped inwards, and the first brake shoe and the second brake shoe are driven to expand to realize braking.
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 (10)
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 first pull rod and a second pull rod;
the first brake shoe and the second brake shoe are mounted on the chassis through limit pins, and a return spring is arranged between the first brake shoe and the second brake shoe;
the first pull rod and the second pull rod are arranged in a scissor mode, the head end of the first pull rod is connected with a first driving piece used for driving a first brake shoe, and the head end of the second pull rod is connected with a second driving piece used for driving a second brake shoe; and a bearing point position is arranged between the first pull rod and the second pull rod and is close to the head end position of the pull rod.
2. The drum brake assembly as set forth in claim 1, wherein: the distance between the bearing point and the head end of the pull rod accounts for 1/5-1/6 of the length of the whole pull rod.
3. The drum brake assembly as set forth in claim 1, wherein: one end of the first brake shoe is provided with a mounting hole matched with the first driving piece, the mounting hole is a semicircular opening hole, the first driving piece is in a semicircular column shape, the first driving piece is mounted in the mounting hole of the first brake shoe, and the first driving piece form circular arc sliding fit; one end of the second brake shoe is provided with a mounting hole matched with the second driving piece, the mounting hole is a semicircular opening hole, the second driving piece is in a semicircular column shape, the second driving piece is mounted in the mounting hole of the second brake shoe, and the second driving piece form circular arc sliding fit.
4. The drum brake assembly as set forth in claim 1, wherein: the first pull rod and the second pull rod are located on the outer side face of the chassis, through holes used for installing the first driving piece and the second driving piece are formed in the chassis, and the first driving piece and the second driving piece penetrate through the through holes.
5. The drum brake assembly as set forth in claim 1, wherein: the outer side surface of the chassis is provided with a buckle cover for installing the first pull rod and the second pull rod, and the head parts of the first pull rod and the second pull rod are installed in the buckle cover.
6. 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 spacer pin one side, and another sets up in being close to driving piece one side.
7. 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.
8. 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 main shaft.
9. The drum brake assembly as set forth in claim 1, wherein: 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.
10. The drum brake assembly as set forth in claim 1, wherein: the tail end of the first pull rod and the tail end of the second pull rod are respectively provided with a brake cable positioning installation part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020771503.XU CN212028385U (en) | 2020-05-11 | 2020-05-11 | Drum brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020771503.XU CN212028385U (en) | 2020-05-11 | 2020-05-11 | Drum brake device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212028385U true CN212028385U (en) | 2020-11-27 |
Family
ID=73480599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020771503.XU Active CN212028385U (en) | 2020-05-11 | 2020-05-11 | Drum brake device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212028385U (en) |
-
2020
- 2020-05-11 CN CN202020771503.XU patent/CN212028385U/en active Active
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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: 20230210 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 |