CN215293357U - Drum brake with adjustable clearance - Google Patents
Drum brake with adjustable clearance Download PDFInfo
- Publication number
- CN215293357U CN215293357U CN202120803862.3U CN202120803862U CN215293357U CN 215293357 U CN215293357 U CN 215293357U CN 202120803862 U CN202120803862 U CN 202120803862U CN 215293357 U CN215293357 U CN 215293357U
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- CN
- China
- Prior art keywords
- rotating block
- drum
- brake
- semi
- arm
- 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.)
- Expired - Fee Related
Links
- 239000007769 metal material Substances 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims 2
- 238000003780 insertion Methods 0.000 claims 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 210000000003 hoof Anatomy 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Braking Arrangements (AREA)
Abstract
The application discloses a gap-adjustable drum brake, which comprises a drum cover, a fixed block, a rocker arm, a rotating block and two brake shoes, wherein one ends of the brake shoes are hinged with the drum cover, a return spring is connected between each brake shoe and the fixed block, and the end parts of the two brake shoes are abutted to the rotating block; the rotating block comprises a locking bolt, a locking nut, an inner rotating block and an outer sleeve unit sleeved outside the inner rotating block, the inner rotating block comprises a cuboid-shaped part, a first semi-cylindrical part positioned at one end of the cuboid-shaped part and a second semi-cylindrical part positioned at the other end of the cuboid-shaped part, and the outer sleeve unit is U-shaped and comprises a semicircular ring bottom and two arm parts fixed at two sides of the semicircular ring bottom; and the locking bolt is matched with the locking nut to lock the inner rotating block and the two arm parts. The drum brake of this application can adjust, makes things convenient for follow-up vehicle's maintenance very much.
Description
Technical Field
The application relates to the field of braking, in particular to a gap-adjustable drum brake.
Background
The brake, also called braking, is an operation for stopping or reducing the speed of a running locomotive, vehicle, other transportation means, machine, or the like. The drum brake is used on some high-end bicycles and electric bicycles without special requirements, and the drum brake is used on some high-end bicycles, and when the drum brake is used for braking, a rocker arm is required to drive a rotating block to rotate, so that two brake shoes are spread to realize braking, and when the brake is released, the brake shoes are reset, so that no friction force is generated. Because the stroke of the brake shoe generated by the rotation of the rotating block is limited, after the brake shoe is used for a period of time, the friction plate becomes thin, or parts are slightly deformed, and the like, the stroke generated by the brake shoe when the rotating block rotates cannot realize good braking, so that the braking effect is poor.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the present application aims to overcome the disadvantages of the prior art and to provide an adjustable clearance drum brake.
The technical scheme is as follows: a drum brake capable of adjusting a gap comprises a drum cover, a fixed block fixed at the drum cover, a rocker arm arranged at the drum cover, a rotating block driven by the rocker arm and two brake shoes arranged at the drum cover, wherein one end of each brake shoe is hinged with the drum cover, a return spring is connected between each brake shoe and the fixed block, and the end parts of the two brake shoes are abutted to the rotating block; the rotating block comprises a locking bolt, a locking nut, an inner rotating block and an outer sleeve unit sleeved outside the inner rotating block, the inner rotating block comprises a rectangular part, a first semi-cylindrical part located at one end of the rectangular part and a second semi-cylindrical part located at the other end of the rectangular part, a strip-shaped slot is formed in the inner rotating block, the outer sleeve unit is U-shaped and comprises a semicircular ring bottom and two arm parts fixed to two sides of the semicircular ring bottom, and the outer sleeve unit is further provided with a strip-shaped inserting rib which is fixed to the semicircular ring bottom and can be inserted into the strip-shaped groove; the first semi-cylindrical portion has a through hole, one of the two arm portions has a first mounting hole, and the other of the two arm portions has a second mounting hole, and the lock bolt and the lock nut cooperate to lock the inner rotating block and the two arm portions.
Further, the arm part comprises a straight plate and an arc-surface limiting plate fixed at the end part of the straight plate; both the two limiting plates abut against the first semi-cylindrical part; the bottom of the semicircular ring abuts against the second semi-cylindrical part. Thereby realize the parcel effect, even need not the bolt and also can realize fixed and spacing of overcoat unit.
Further, the inner turning block and the outer sheath unit are both made of a metal material.
Further, the first mounting hole is located at the position-limiting plate of one of the arms, and the second mounting hole is located at the position-limiting plate of the other arm.
Further, the first mounting hole and the second mounting hole are both counter bores.
Furthermore, the end of the strip-shaped slot is provided with a positioning groove, and the end of the strip-shaped dowel bar is provided with a positioning bulge. Thereby realizing better positioning and limiting.
Has the advantages that: the drum brake of this application can realize whether using overcoat unit to the turning block to change the volume of turning block, thereby when the rocking arm rotates, adjust the stroke that the brake shoe propped outward, thereby obtain better braking effect when the braking. If the friction plate of the brake shoe generates little friction when no brake is applied, a larger gap between the brake shoe and the rotating drum can be obtained by eliminating the outer sleeve unit, so that the influence on normal running is avoided.
Drawings
FIG. 1 is a schematic view of a drum brake;
FIG. 2 is an assembly view of the inner rotor block and the outer housing unit;
fig. 3 is a schematic view of a turning block.
Detailed Description
Reference numerals: 1, covering a drum; 2, braking the hoof; 2.1 friction plate; 3, fixing blocks; 4, a return spring; 5, turning the block; 5.1 inner turning block; 5.1 a first semi-cylindrical portion; 5.2 a second semi-cylindrical portion; 5.3 a cuboid shaped portion; 5.4 strip-shaped slots; 5.5 positioning the groove; 5.6 through holes; 6 a jacket unit; 6.1 the bottom of the semicircular ring; 6.2 limiting plates; 6.3 strip-shaped joint bars; 7.1 locking the bolt; 7.2 locking the nut.
As shown in the figure: a drum brake capable of adjusting a gap comprises a drum cover 1, a fixed block 3 fixed at the drum cover 1, a rocker arm arranged at the drum cover 1, a rotating block driven by the rocker arm and two brake shoes 2 arranged at the drum cover 1, wherein one end of each brake shoe 2 is hinged with the drum cover 1, a return spring 4 is connected between each brake shoe 2 and the fixed block 3, and the end parts of the two brake shoes 2 are abutted to the rotating block; the turning block comprises a locking bolt 7.1, a locking nut 7.2, an inner turning block 5 and an outer sleeve unit 6 sleeved outside the inner turning block 5, the inner turning block 5 comprises a rectangular part 5.3, a first semi-cylindrical part 5.1 positioned at one end of the rectangular part 5.3 and a second semi-cylindrical part 5.2 positioned at the other end of the rectangular part 5.3, a strip-shaped slot 5.4 is formed in the inner turning block 5, the outer sleeve unit 6 is U-shaped and comprises a semicircular ring bottom 6.1 and two arm parts fixed to two sides of the semicircular ring bottom 6.1, and the outer sleeve unit is further provided with a strip-shaped inserting rib 6.3 which is fixed with the semicircular ring bottom 6.1 and can be inserted into a strip-shaped groove; the first semi-cylindrical part 5.1 has a through hole 5.6, one of the two arms has a first mounting hole and the other has a second mounting hole, and the locking bolt 7.1 and the locking nut 7.2 cooperate to lock the inner turning block 5 and the two arms.
The arm part comprises a straight plate and an arc-surface limiting plate 6.2 fixed at the end part of the straight plate; both limiting plates 6.2 abut against the first semi-cylindrical portion 5.1; the semi-circular ring bottom 6.1 abuts the second semi-cylindrical part 5.2. The inner turning block 5 and the outer sheath unit 6 are made of a metal material. The first mounting hole is located at the position of the limiting plate 6.2 of one arm, and the second mounting hole is located at the position of the limiting plate 6.2 of the other arm. The first mounting hole and the second mounting hole are both counter bores. The end of the strip-shaped slot 5.4 is provided with a positioning groove 5.5, and the end of the strip-shaped dowel bar 6.3 is provided with a positioning bulge.
As shown in figure 1, the drum brake of the application drives the rotating block to rotate through the rocker arm, so that two brake shoes are spread, and the vehicle is braked. After the vehicle is used for a period of time, the brake braking effect is poor due to looseness and deformation of parts installation and loss and deformation of friction plates, or the riding is difficult due to unnecessary friction. The size of the rotating block can be changed by selecting whether the outer sleeve unit is installed or not, so that the gap between the brake shoe and the rotating drum can be adjusted, when the braking effect is poor, the outer sleeve unit is additionally installed, the larger outer supporting stroke of the brake shoe is obtained, and the better braking effect is obtained. When the friction plate generates friction under the condition of no braking, the outer sleeve unit is cancelled, so that the initial gap between the brake shoe and the rotating drum is enlarged, and the bidirectional adjustment is realized by adding the outer sleeve unit or not. During the installation, because two arms and dowel bar all have certain elasticity, can follow from outside up the turning block including the overcoat unit cover to accurate block and location between two limiting plates and the location arch are adding the locking bolt and the lock nut that are located the tip, and the monolithic stationary effect is better.
Although the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.
Claims (6)
1. A drum brake capable of adjusting a gap is characterized by comprising a drum cover, a fixed block fixed at the drum cover, a rocker arm arranged at the drum cover, a rotating block driven by the rocker arm and two brake shoes arranged at the drum cover, wherein one end of each brake shoe is hinged with the drum cover, a return spring is connected between each brake shoe and the fixed block, and the end parts of the two brake shoes are abutted to the rotating block; the rotating block comprises a locking bolt, a locking nut, an inner rotating block and an outer sleeve unit sleeved outside the inner rotating block, the inner rotating block comprises a rectangular part, a first semi-cylindrical part located at one end of the rectangular part and a second semi-cylindrical part located at the other end of the rectangular part, a strip-shaped slot is formed in the inner rotating block, the outer sleeve unit is U-shaped and comprises a semicircular ring bottom and two arm parts fixed to two sides of the semicircular ring bottom, and the outer sleeve unit is further provided with a strip-shaped inserting rib which is fixed to the semicircular ring bottom and can be inserted into the strip-shaped groove; the first semi-cylindrical portion has a through hole, one of the two arm portions has a first mounting hole, and the other of the two arm portions has a second mounting hole, and the lock bolt and the lock nut cooperate to lock the inner rotating block and the two arm portions.
2. A gap adjustable drum brake according to claim 1, characterised in that the arm comprises a straight plate and a limiting plate of arcuate shape fixed to the end of the straight plate; both the two limiting plates abut against the first semi-cylindrical part; the bottom of the semicircular ring abuts against the second semi-cylindrical part.
3. A gap adjustable drum brake according to claim 1, in which the inner rotor and the outer housing unit are both made of a metallic material.
4. The adjustable clearance drum brake of claim 1, wherein the first mounting hole is located at the limit plate of one of the arms and the second mounting hole is located at the limit plate of the other arm.
5. A gap adjustable drum brake according to claim 4 in which both said first and second mounting holes are counter bored.
6. A gap-adjustable drum brake according to claim 1, characterized in that the end of the strip-shaped insertion groove has a positioning groove, and the end of the strip-shaped insertion rib has a positioning projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120803862.3U CN215293357U (en) | 2021-04-19 | 2021-04-19 | Drum brake with adjustable clearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120803862.3U CN215293357U (en) | 2021-04-19 | 2021-04-19 | Drum brake with adjustable clearance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215293357U true CN215293357U (en) | 2021-12-24 |
Family
ID=79537101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120803862.3U Expired - Fee Related CN215293357U (en) | 2021-04-19 | 2021-04-19 | Drum brake with adjustable clearance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215293357U (en) |
-
2021
- 2021-04-19 CN CN202120803862.3U patent/CN215293357U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20211224 |