CN202883825U - Asymmetric cam type brake - Google Patents
Asymmetric cam type brake Download PDFInfo
- Publication number
- CN202883825U CN202883825U CN 201220472121 CN201220472121U CN202883825U CN 202883825 U CN202883825 U CN 202883825U CN 201220472121 CN201220472121 CN 201220472121 CN 201220472121 U CN201220472121 U CN 201220472121U CN 202883825 U CN202883825 U CN 202883825U
- Authority
- CN
- China
- Prior art keywords
- cam
- brake shoe
- shaped
- braking
- point
- 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
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Abstract
The utility model discloses an asymmetric cam type brake which comprises a brake drum, a left brake shoe and a right brake shoe. The left brake shoe and the right brake shoe are hinged with the bottom of a support plate through bottom hinging joints. Two sides of the upper portions of the left brake shoe and the right brake shoe are tensioned and adhered to two sides of a cam through reset springs. The cam is hinged with the upper portion of the support plate through a hinging joint. The cam is an 8-shaped cam with the upper portion, the lower portion, the left portion and the right portion symmetrical. When in braking, action points of the 8-shaped cam to the left brake shoe and the right brake shoe are asymmetric, namely, the action point of the 8-shaped cam to the left brake shoe is on the upper portion or the lower portion and the action point of the 8-shaped cam to the right brake shoe is on the lower portion or the upper portion. Compared with the prior art, even abrasion of the brake shoes, improvement on braking effect and the aim of achieving two-direction braking are achieved through a simple structure. The asymmetric cam type brake has the advantages of being low in cost, simple in structure, convenient to repair and the like.
Description
Technical field
The utility model relates to a kind of cam type brake, especially relates to a kind of asymmetrical cam formula break that can improve the uneven situation of both sides gasket wear.
Background technique
The brake shoe of common cam brake, be divided into the neck hoof with from hoof.Under the background of brake shoe mirror symmetric motion, brake shoe does not satisfy mirror symmetry (under the side direction, opposite side upwards) to the frictional force of brake drum.During braking, the neck hoof is reinforcement voluntarily, subtracts voluntarily power from hoof, thereby makes brake shoe unequal to the impacting force of brake drum, so the degree of wear of two brake shoes is different, has affected braking effect.Patent CN102022460A, CN202099000U, the patents such as 200720080245.5 have all related to the improvement design of the cam type brake that makes the brake shoe even wearing.But existing improvement designs or has increased the complexity of structure, or can not bi-directional braking.
Summary of the invention
The purpose of this utility model is to provide a kind of asymmetrical cam formula break, under the prerequisite that does not increase the complex structure degree, reduces cam brake neck hoof and difference from the hoof friction, and can realize bi-directional braking.
The technological scheme that the utility model technical solution problem adopts is:
The utility model comprises brake drum, left brake shoe and right braking hoof, left brake shoe and right braking hoof are by bottom-hinged point and tray deck bottom-hinged, left brake shoe and both sides, right braking hoof top lean against the cam bi-side by the returning spring tension, cam is by articulating point and tray deck upper articulation: described cam is upper, lower, left, right all " 8-shaped " cams of symmetry, during braking, " 8-shaped " cam to about the point of action of two brake shoes asymmetric, be 8-shaped " cam to the point of action of left brake shoe upper or lower, to the point of action of right braking hoof lower or upper.
The utility model is compared with background technique, and the beneficial effect that has is:
The utility model is compared with the multinomial cam brake in the background technique, has realized the brake shoe uniform wear, improves braking effect and realized the purpose of bi-directional braking to have the advantages such as cost is low, simple in structure, easy to maintenance by simple structure.
Description of drawings
Fig. 1 is structure principle chart of the present utility model;
Fig. 2 is the free-body diagram of brake shoe when forward is braked in the utility model;
The stressed schematic representation of left brake shoe when Fig. 3 is the forward braking;
The stressed schematic representation of right braking hoof when Fig. 4 is the forward braking;
Fig. 5 be in the utility model reverse when braking brake shoe free-body diagram;
Among the figure: 1, tray deck, 2, " 8-shaped " cam, 3, left brake shoe, 4, right braking hoof, 5, articulating point, 6, returning spring, 7 brake drums.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the utility model comprises brake drum 7, left brake shoe 3 and right braking hoof 4; Left brake shoe 3 and right braking hoof 4 are by bottom-hinged point 5 and tray deck 1 bottom-hinged, left brake shoe 3 and both sides, right braking hoof 4 top lean against all " 8-shaped " cam bi-side of symmetry, upper and lower, left and right by returning spring 6 tensions, and " 8-shaped " cam is by articulating point and tray deck upper articulation.During braking, " 8-shaped " cam is asymmetric to the point of action of left brake shoe 3 and right braking hoof 4, i.e. 8-shaped " point of action of 2 pairs of left brake shoes 2 of cam is upper or lower, to the point of action of right braking hoof 4 lower or upper.
Such as Fig. 2, Fig. 3, shown in Figure 4, when brake drum 7 clockwise directions rotated, right braking hoof 2 is reinforcement voluntarily, and left brake shoe 3 subtracts power voluntarily." 8-shaped " cam 2 rotates counterclockwise, the upper end in contact on " 8-shaped " cam 2 upper left corners and left brake shoe 3 planes, the lower end in contact on " 8-shaped " cam 2 lower right corner and right braking hoof 4 planes, " 8-shaped " cam 2 is asymmetric with the point of contact of left brake shoe 3 and right braking hoof 4.Thereby exert all one's strength F
1, F
2Arm of force L
1With L
2Asymmetric, so moment F
1L
1With F
2L
2Asymmetric, F
1L
1＞F
2L
2
The suffered resultant couple of left side brake shoe: M
1=F
1L
1-f
1r
1
The suffered resultant couple of right side brake shoe: M2=F
2L
2+ f
2r
2
In the formula: f
1Be the suffered frictional force of left brake shoe, r
1Be f
1The arm of force, f
2Be the suffered frictional force of right braking hoof, r
2Be f
2The arm of force, F
1Be the pressure of cam to left brake shoe, L
1Be F
1The arm of force, F
2Be the pressure of cam to right braking hoof, L
2Be F
2The arm of force.
Cam is asymmetric to the point of action of two brake shoes, produces asymmetric opplied moment, and cam is to the opplied moment F of left brake shoe
1L
1Greater than the opplied moment F to right braking hoof
2L
2Left brake shoe subtracts the resultant couple M after the power voluntarily
1With the right braking hoof resultant couple M behind the reinforcement voluntarily
2Mirror is symmetrical, and then left brake shoe equates with the impacting force of right braking hoof to brake drum, thereby makes both sides brake shoe even wearing, improves braking effect.
Such as Fig. 2, shown in Figure 5, forward and backward rotation by " 8-shaped " cam 2 realize bi-directional braking, braking when " 8-shaped " cam 2 clockwise rotates and realizes that brake drum counterclockwise rotates, " 8-shaped " cam 2 rotates counterclockwise the braking when realizing the rotation of brake drum clockwise direction.
Claims (1)
1. an asymmetrical cam formula break comprises brake drum, left brake shoe and right braking hoof; Left brake shoe and right braking hoof are by bottom-hinged point and tray deck bottom-hinged, and left brake shoe and both sides, right braking hoof top lean against the cam bi-side by the returning spring tension, and cam is by articulating point and tray deck upper articulation; It is characterized in that: described cam is all " 8-shaped " cams of symmetry of upper and lower, left and right, during braking, " 8-shaped " cam to about the point of action of two brake shoes asymmetric, be 8-shaped " cam to the point of action of left brake shoe upper or lower, to the point of action of right braking hoof lower or upper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220472121 CN202883825U (en) | 2012-09-17 | 2012-09-17 | Asymmetric cam type brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220472121 CN202883825U (en) | 2012-09-17 | 2012-09-17 | Asymmetric cam type brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202883825U true CN202883825U (en) | 2013-04-17 |
Family
ID=48075256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220472121 Expired - Fee Related CN202883825U (en) | 2012-09-17 | 2012-09-17 | Asymmetric cam type brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202883825U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878229A (en) * | 2012-09-17 | 2013-01-16 | 浙江大学 | Asymmetrical cam type brake |
-
2012
- 2012-09-17 CN CN 201220472121 patent/CN202883825U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878229A (en) * | 2012-09-17 | 2013-01-16 | 浙江大学 | Asymmetrical cam type brake |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20140917 |
|
| EXPY | Termination of patent right or utility model |