CN209875800U - Bidirectional brake drum brake - Google Patents
Bidirectional brake drum brake Download PDFInfo
- Publication number
- CN209875800U CN209875800U CN201920531302.XU CN201920531302U CN209875800U CN 209875800 U CN209875800 U CN 209875800U CN 201920531302 U CN201920531302 U CN 201920531302U CN 209875800 U CN209875800 U CN 209875800U
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- Prior art keywords
- brake
- brake shoe
- tension spring
- shoe
- moving shaft
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- Expired - Fee Related
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- 230000002457 bidirectional effect Effects 0.000 title abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 claims 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Braking Arrangements (AREA)
Abstract
The utility model discloses a bidirectional brake drum brake, which comprises a brake box body and a brake mechanism, wherein the brake mechanism is arranged inside the brake box body; the brake box body is a cavity-shaped structural part, and a camshaft hole, a middle shaft hole, a moving shaft hole, a tension spring hook and a pair of supporting bosses are arranged in the brake box body; the brake mechanism comprises a first brake shoe, a second brake shoe, a cam shaft, a moving shaft, a rocker arm, a first tension spring, a second tension spring and a third tension spring; the utility model discloses a clearance compensation of two brake shoes reduces wearing and tearing, improves product life.
Description
Technical Field
The utility model relates to a stopper, more specifically say so and relate to a two-way braking drum brake.
Background
The traditional drum brake achieves the purpose of braking by braking a brake hub of a motor through two brake shoes, and has the following defects: 1. theoretically, the two brake shoes are the same, but from the actual manufacturing process, the two brake shoes cannot be the same, so that gaps between the two brake shoes and a brake hub are different, the two brake shoes have a sequence in the braking process, and the two brake shoes cannot automatically compensate the gap between the two brake shoes and the brake hub; 2. in a traditional drum brake, two brake shoes have a master-slave relationship, the brake shoe used for braking in the forward direction is used as a main brake shoe, so that the braking force during backward movement is weaker than that during forward movement, and potential safety hazards exist during backward movement; 3. the process requirements are extremely high in the manufacturing process of the brake shoes, the same process cannot be achieved, noise is easy to generate during braking, and the two brake shoes are abraded differently; 4. because the two brake shoes can not be braked simultaneously, long-time braking is needed to achieve the braking effect, the brake handle has large brake pinching force, the abrasion of the brake shoes is accelerated, the service life is greatly reduced, and the quality stability of the brake is poor.
Disclosure of Invention
The utility model aims at providing a two-way braking drum brake realizes two brake shoe's clearance compensation, reduces wearing and tearing, improves product life.
The utility model discloses a following technical scheme realizes:
a bidirectional brake drum brake comprises a brake box body and a brake mechanism, wherein the brake mechanism is arranged in the brake box body; the brake box body is a cavity-shaped structural part, a camshaft hole, a middle shaft hole, a moving shaft hole, a tension spring hook and a pair of supporting bosses are arranged in the brake box body, the camshaft hole, the middle shaft hole and the moving shaft hole are sequentially and linearly arranged, the moving shaft hole is a waist-shaped through hole, the tension spring hook is arranged on the inner side surface of the brake box body, and the pair of supporting bosses are respectively arranged on two sides of the middle shaft hole;
the brake mechanism comprises a first brake shoe, a second brake shoe, a cam shaft, a moving shaft, a rocker arm, a first tension spring, a second tension spring and a third tension spring; the brake shoe I and the brake shoe II are of semicircular structures which are symmetrically arranged, the brake shoe I and the brake shoe II are connected through two ends of a semicircular ring to form a circle, the brake shoe I and the brake shoe II form a circle and are arranged in an inner cavity of a brake box body, planes of the brake shoe I and the brake shoe II are respectively contacted with a pair of supporting bosses, brake pads are respectively arranged on excircles of the brake shoe I and the brake shoe II, a gap is arranged between the excircles of the brake shoe I and the brake shoe II and the inner cavity of the brake box body and a brake hub of a motor, one ends of the brake shoe I and the brake shoe II are respectively embedded with wear-resistant inserts, planes of the two inserts are mutually parallel and are provided with gaps, the planes of the two inserts are parallel to the axis of a central shaft hole, the other ends of the brake shoe I and the brake shoe II are respectively provided with a semicircular arc groove, the axis of the semicircular arc groove is parallel to the axis of the central shaft, a pair of tension spring holes II and a pair of tension spring holes III are respectively and symmetrically arranged at the upper and lower parts of the brake shoe I and the brake shoe II close to the inner sides;
the cam shaft is a shaft part, one end of the cam shaft is a rounded rectangular body, the cam shaft is installed in a cam shaft hole, the rounded rectangular body is arranged in a gap between the inserts of the brake shoe I and the brake shoe II, and the other end of the cam shaft extends out of the brake box body and is installed with the rocker arm;
the brake shoe I and the brake shoe II can rotate around the moving shaft, and the moving shaft is movably arranged in the moving shaft hole through a locking nut;
one end of the first tension spring is hooked on the first tension spring hook, and the other end of the first tension spring is hooked in the first tension spring hole; two ends of the second tension spring are respectively connected with a first brake shoe and a second tension spring hole of the second brake shoe; two ends of the tension spring III are respectively connected with a tension spring hole III of the brake shoe I and the brake shoe II.
The purpose of the utility model can be further realized through the following technical measures:
in the bidirectional brake drum brake, the tension spring hook is located close to the moving shaft hole.
When the bidirectional brake drum brake is not used for braking, the planes of the insert parts of the first brake shoe and the second brake shoe are respectively contacted with two sides of the long-side plane of the rounded rectangular body of the cam shaft.
In the bidirectional brake drum brake, the center of the movable shaft hole deviates from the extension line of the center of the cam shaft hole and the center of the middle shaft hole, and two sides of the movable shaft hole are respectively provided with an arc surface; when the brake is not applied, the second brake shoe is under the action of the first tension spring, the second brake shoe pushes the moving shaft and the first brake shoe to move until the middle part of the moving shaft abuts against an arc surface of the moving shaft hole, and the arc surface is an arc surface close to the first brake shoe, so that the gap between the first brake shoe and the brake hub is smaller than the gap between the second brake shoe and the brake hub.
When the bidirectional brake drum brake is used for braking, the cam shaft rotates to drive the first brake shoe and the second brake shoe to simultaneously expand towards the direction of the brake hub, the first brake shoe contacts the brake hub earlier than the second brake shoe, the direction of friction torque generated by the first brake shoe during braking is the same as the rotating direction of the brake hub, the first brake shoe is attached to the brake hub more tightly, the moving shaft is driven to move from the arc surface on one side to the arc surface on the other side, and therefore the gap between the first brake shoe and the second brake shoe and the brake hub is automatically compensated, and the braking effect is achieved.
In the bidirectional brake drum brake, the pair of tension spring holes two is close to the cam shaft, and the pair of tension spring holes three is close to the moving shaft.
In the bidirectional brake drum brake, the pad is arranged below the lock nut of the moving shaft and used for pressing one end of the first brake shoe and one end of the second brake shoe against the moving shaft.
The utility model discloses a camshaft's rotation drives the expansion of brake shoe one and brake shoe two and realizes the braking. When the brake is not applied, the second brake shoe is under the action of the first tension spring, the second brake shoe pushes the moving shaft and the first brake shoe to move until the middle part of the moving shaft abuts against an arc surface of the moving shaft hole, and the arc surface is an arc surface close to the first brake shoe, so that the gap between the first brake shoe and the brake hub is smaller than the gap between the second brake shoe and the brake hub. When braking, the camshaft rotates to drive the first brake shoe and the second brake shoe to expand towards the direction of the brake hub at the same time, the first brake shoe contacts the brake hub earlier than the second brake shoe, the direction of friction torque generated by the first brake shoe during braking is the same as the rotation direction of the brake hub, so that the first brake shoe is attached to the brake hub more tightly, the movable shaft is driven to move from the arc surface on one side to the arc surface on the other side, so that the gap between the first brake shoe and the second brake shoe and the brake hub is automatically compensated, the purpose of simultaneous braking is achieved, the braking effect is good, the same forward and backward braking force is ensured, the hand feeling of simultaneous pinch braking is light, the braking mechanism is sensitive, the braking noise is eliminated, the service life is long, the requirements on the manufacturing process of the first brake shoe are low. In order to realize that the movable shaft can move in the movable shaft hole, the pressing force is adjusted by arranging a gasket.
The advantages and features of the invention will be illustrated and explained by the following non-restrictive description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.
Drawings
Fig. 1 is a perspective view of the present invention;
fig. 2 is a perspective view of the brake box body of the present invention;
fig. 3 is a perspective view of a first brake shoe and a second brake shoe of the present invention;
fig. 4 is a cross-sectional view of the present invention 1;
fig. 5 is a cross-sectional view of the present invention 1;
fig. 6 is an exploded view of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 and 6, the brake box of the present invention comprises a brake box body 10 and a brake mechanism 2, wherein the brake mechanism 2 is arranged inside the brake box body 10; as shown in fig. 2, the brake box body 10 is a cavity-shaped structural component, and is provided therein with a camshaft hole 28, a center shaft hole 30, a moving shaft hole 15, a tension spring hook 16 and a pair of supporting bosses 29, wherein the camshaft hole 28, the center shaft hole 30 and the moving shaft hole 15 are arranged in a straight line in sequence, the moving shaft hole 15 is a kidney-shaped through hole, two sides of the moving shaft hole 15 are arc surfaces 31, the center of the moving shaft hole 15 deviates from the extension line of the center of the camshaft hole 28 and the center shaft hole 30, the tension spring hook 16 is disposed on the inner side surface of the brake box body 10, the tension spring hook 16 is located near the moving shaft hole 15, and the pair of supporting bosses 29 are disposed on.
As shown in fig. 3, 4, 5, and 6, the brake mechanism 2 includes a first brake shoe 22, a second brake shoe 23, a camshaft 12, a moving shaft 14, a rocker arm 17, a first tension spring 13, a second tension spring 21, and a third tension spring 20; the brake shoe I22 and the brake shoe II 23 are of symmetrically arranged semicircular structures, the brake shoe I22 and the brake shoe II 23 are connected through two ends of the semicircular rings to form a circle, the brake shoe I22 and the brake shoe II 23 form a circle and are arranged in the inner cavity of the brake box body 10, as shown in figure 4, the planes of the brake shoe I22 and the brake shoe II 23 are respectively contacted with a pair of supporting bosses 29, brake pads 33 are respectively arranged on the outer circles of the brake shoe I22 and the brake shoe II 23, a gap is arranged between the outer circles of the brake shoe I22 and the brake shoe II 23 and the inner cavity of the brake box body 10 and a brake hub of a motor, one ends of the brake shoe I22 and the brake shoe II 23 are respectively embedded with wear-resistant inserts 34, the planes of the two inserts 34 are mutually parallel and are provided with a gap, the planes of the two inserts 34 are parallel to the axis of the center shaft hole 30, the other ends of the brake shoe I22 and the brake shoe II 23 are respectively, the axis of the semi-circular arc groove 27 is parallel to the axis of the center shaft hole 30, a first tension spring hole 26 is formed in the brake shoe II 23, a pair of second tension spring holes 25 and a pair of third tension spring holes 24 are respectively and symmetrically formed in the positions, close to the inner sides, of the brake shoe I22 and the brake shoe II 23, the pair of second tension spring holes 25 is close to the cam shaft 12, and the pair of third tension spring holes 24 is close to the moving shaft 14.
The camshaft 12 is a shaft part, one end of the camshaft 12 is a rounded rectangular body 121, the camshaft 12 is installed in the camshaft hole 28, the rounded rectangular body 121 is arranged in a gap between the first brake shoe 22 and the insert 34 of the second brake shoe 23, and the other end of the rounded rectangular body extends out of the brake box body 10 and is installed with the rocker arm 17. When the brake is not applied, the plane surfaces of the insert parts 34 of the first brake shoe 22 and the second brake shoe 23 are respectively contacted with two sides of the long-side plane surface of the round rectangular body 121 of the camshaft 12.
The moving shaft 14 is a shaft-type part, one end of the moving shaft is a cylindrical boss, the other end of the moving shaft is provided with threads, the middle part of the moving shaft is a cylinder, the moving shaft 14 penetrates through the outer side of the brake box body 10, the cylindrical boss of the moving shaft is arranged on the outer side of the brake box body 10, the middle part of the moving shaft penetrates through the moving shaft hole 15, the semi-circular grooves 27 of the first brake shoe 22 and the second brake shoe 23 are respectively clamped in the middle part of the moving shaft 14, the first brake shoe 22 and the second brake shoe 23 can rotate around the moving shaft 14, the moving shaft 14 is movably arranged in the moving shaft hole 15 through the locking nut 19, and the gasket 18 is arranged below the locking nut 19 and used for pressing one ends of the first brake.
One end of the first tension spring 13 is hooked on the first tension spring hook 16, and the other end of the first tension spring is hooked in the first tension spring hole 26; two ends of the second tension spring 21 are respectively connected with a second tension spring hole 25 of the first brake shoe 22 and the second brake shoe 23; two ends of the tension spring III 20 are respectively connected with a tension spring hole III 24 of the brake shoe I22 and the brake shoe II 23.
Before braking, as shown in fig. 1, the second brake shoe 23 is acted by the first tension spring 13, the second brake shoe 23 pushes the moving shaft 14 and the first brake shoe 22 to move until the middle part of the moving shaft 14 abuts against the left circular arc surface 31 of the moving shaft hole 15, and therefore the gap between the first brake shoe 22 and the brake hub is smaller than the gap between the second brake shoe 23 and the brake hub.
During braking, the camshaft 12 rotates, so that the first brake shoe 22 and the second brake shoe 23 are driven to expand towards the brake hub simultaneously, the first brake shoe 22 contacts the brake hub before the second brake shoe 23, the direction of friction torque generated by the first brake shoe 22 during braking is the same as the rotating direction of the brake hub, the first brake shoe 22 is attached to the brake hub more tightly, and as shown in fig. 1, the movable shaft 14 is driven to move from the left circular arc surface to the right circular arc surface, so that gaps between the first brake shoe 22 and the second brake shoe 23 and the brake hub are automatically compensated, and a braking effect is achieved.
And after braking is finished, the tension spring I13 is reset, and the action before braking is repeated.
In addition to the above embodiments, the present invention can also have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (7)
1. A bi-directional drum brake characterized by: the brake box comprises a brake box body and a brake mechanism, wherein the brake mechanism is arranged in the brake box body; the brake box body is a cavity-shaped structural part, a camshaft hole, a middle shaft hole, a moving shaft hole, a tension spring hook and a pair of supporting bosses are arranged in the brake box body, the camshaft hole, the middle shaft hole and the moving shaft hole are sequentially and linearly arranged, the moving shaft hole is a waist-shaped through hole, the tension spring hook is arranged on the inner side surface of the brake box body, and the pair of supporting bosses are respectively arranged on two sides of the middle shaft hole;
the brake mechanism comprises a first brake shoe, a second brake shoe, a cam shaft, a moving shaft, a rocker arm, a first tension spring, a second tension spring and a third tension spring; the brake shoe I and the brake shoe II are of semicircular structures which are symmetrically arranged, the brake shoe I and the brake shoe II are connected through two ends of a semicircular ring to form a circle, the brake shoe I and the brake shoe II form a circle and are arranged in an inner cavity of the brake box body, planes of the brake shoe I and the brake shoe II are respectively contacted with a pair of supporting bosses, brake pads are respectively arranged on excircles of the brake shoe I and the brake shoe II, a gap is arranged between the excircles of the brake shoe I and the brake shoe II and the inner cavity of the brake box body and a brake hub of the motor, one ends of the brake shoe I and the brake shoe II are respectively embedded with a wear-resistant insert, planes of the two inserts are mutually parallel and are provided with a gap, the planes of the two inserts are parallel to the axis of the central shaft hole, the other ends of the brake shoe I and the brake shoe II are respectively provided with a semicircular arc groove, the axis of the semicircular arc groove is parallel to the axis of the central shaft, a pair of tension spring holes II and a pair of tension spring holes III are respectively and symmetrically arranged at the upper and lower parts of the first brake shoe and the second brake shoe close to the inner sides;
the cam shaft is a shaft part, one end of the cam shaft is a rounded rectangular body, the cam shaft is installed in a cam shaft hole, the rounded rectangular body is arranged in a gap between the inserts of the brake shoe I and the brake shoe II, and the other end of the cam shaft extends out of the brake box body and is installed with the rocker arm;
the brake shoe comprises a brake box body, a moving shaft, a brake shoe I, a brake shoe II, a locking nut, a moving shaft, a brake shoe I, a brake shoe II, a moving shaft, a brake shoe II and a brake shoe II, wherein the moving shaft is a shaft part, one end of the moving shaft is a cylindrical boss, the other end of the moving shaft is provided with threads, the middle part of the moving shaft is a cylinder, the moving shaft penetrates through the outer side of the brake box body, the cylindrical boss of the moving shaft is arranged on the outer side of the brake box body, the middle part of the moving shaft penetrates through the moving;
one end of the first tension spring is hooked on the tension spring hook, and the other end of the first tension spring is hooked in the first tension spring hole; two ends of the second tension spring are respectively connected with the first brake shoe and a second tension spring hole of the second brake shoe; and two ends of the third tension spring are respectively connected with a third tension spring hole of the first brake shoe and a second tension spring hole of the second brake shoe.
2. A reversible brake drum brake according to claim 1, wherein: the position of the tension spring hook is close to the movable shaft hole.
3. A reversible brake drum brake according to claim 1, wherein: when the camshaft is not braked, the planes of the insert parts of the first brake shoe and the second brake shoe are respectively contacted with the two sides of the long-edge plane of the rounded rectangular body of the camshaft.
4. A reversible brake drum brake according to claim 1, wherein: the center of the movable shaft hole deviates from the extension line of the center of the camshaft hole and the central shaft hole, and arc surfaces are respectively arranged on two sides of the movable shaft hole; when the brake is not applied, the second brake shoe is under the action of the first tension spring, the second brake shoe pushes the moving shaft and the first brake shoe to move until the middle part of the moving shaft abuts against an arc surface of the moving shaft hole, and the arc surface is an arc surface close to the first brake shoe, so that the gap between the first brake shoe and the brake hub is smaller than the gap between the second brake shoe and the brake hub.
5. A reversible brake drum brake according to claim 4, wherein: during braking, the camshaft rotates to drive the first brake shoe and the second brake shoe to expand towards the direction of the brake hub simultaneously, the first brake shoe contacts the brake hub earlier than the second brake shoe, the direction of friction torque generated by the first brake shoe during braking is the same as the rotating direction of the brake hub, the first brake shoe is attached to the brake hub more tightly, the moving shaft is driven to move from the arc surface on one side to the arc surface on the other side, gaps between the first brake shoe and the second brake shoe and the brake hub are automatically compensated, and the braking effect is achieved.
6. A reversible brake drum brake according to claim 1, wherein: the pair of tension spring holes II are close to the camshaft, and the pair of tension spring holes III are close to the moving shaft.
7. A reversible brake drum brake according to claim 1, wherein: and a gasket is arranged below the locking nut of the moving shaft and used for pressing one ends of the first brake shoe and the second brake shoe on the moving shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920531302.XU CN209875800U (en) | 2019-04-18 | 2019-04-18 | Bidirectional brake drum brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920531302.XU CN209875800U (en) | 2019-04-18 | 2019-04-18 | Bidirectional brake drum brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209875800U true CN209875800U (en) | 2019-12-31 |
Family
ID=68960874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920531302.XU Expired - Fee Related CN209875800U (en) | 2019-04-18 | 2019-04-18 | Bidirectional brake drum brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209875800U (en) |
-
2019
- 2019-04-18 CN CN201920531302.XU patent/CN209875800U/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: 20191231 |