CN203670564U - Wheel cylinder piston structure of drum brake - Google Patents
Wheel cylinder piston structure of drum brake Download PDFInfo
- Publication number
- CN203670564U CN203670564U CN201320852646.3U CN201320852646U CN203670564U CN 203670564 U CN203670564 U CN 203670564U CN 201320852646 U CN201320852646 U CN 201320852646U CN 203670564 U CN203670564 U CN 203670564U
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- wheel cylinder
- positioning hole
- spring positioning
- piston
- cylinder spring
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- Expired - Fee Related
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- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000010985 leather Substances 0.000 claims description 4
- 231100000572 poisoning Toxicity 0.000 claims description 3
- 230000000607 poisoning effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000004323 axial length Effects 0.000 description 2
- 101150038956 cup-4 gene Proteins 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model relates to a wheel cylinder piston structure of a drum brake, and belongs to the technical field of braking of automobiles. The middles of the connection positions between a first wheel cylinder piston and a second wheel cylinder piston are provided with a first wheel cylinder spring positioning hole and a second wheel cylinder spring positioning hole respectively, the depth and the diameter of the first wheel cylinder spring positioning hole are equal to those of the second wheel cylinder spring positioning hole, the axis of the first wheel cylinder spring positioning hole coincides with that of the second wheel cylinder spring positioning hole, a wheel cylinder spring is assembled in the first wheel cylinder spring positioning hole and the second wheel cylinder spring positioning hole and is positioned through the first wheel cylinder spring positioning hole and the second wheel cylinder spring positioning hole, and thus the first wheel cylinder piston and the second wheel cylinder piston can be supported. The wheel cylinder piston structure of the drum brake has the advantages of being novel in structure, sealing reliability of the wheel cylinder pistons is improved, eccentric abrasion caused in the braking process of the wheel cylinder pistons is slowed down and stopped, the service life of a wheel cylinder assembly is prolonged, and safety of the drum brake is improved.
Description
Technical field
The utility model belongs to automobile brake technical field, especially the improvement to automobile drum brake.
Background technique
Drum brake is the braking executive device in braking system, is the critical component in brake system of car.Its working principle is the hydraulic pressure that utilizes brake master cylinder assy to produce, drive to the wheel cylinder assembly in rear drum brake by braking line, under hydraulic pressure, wheelcylinder piston promotes after brake shoe parts, and brake shoe parts and brake drum produce surface friction drag, stops the rotation trend of wheel.The element of drum brake is fewer than disk type braker, simple in structure, and manufacture cost is lower.
When normal vehicle operation, brake shoe is at the self-adjustment structure of drum brake inside, under resetting-mechanism comprehensive function, brake shoe rubbing surface keeps certain gap with brake drum all the time, when braking, two wheelcylinder pistons in hydraulic drive wheel cylinder outwards move, wheelcylinder piston promotes two brake shoe parts again near brake drum, brake shoe parts and brake drum produce the rotation that surface friction drag stops wheel, complete after once braking, brake shoe parts depart from brake drum return in break under resetting-mechanism effect, wheelcylinder piston moves under the effect of brake shoe in wheel cylinder, until brake shoe is fixed on initial position under the support of self-adjustment structure, wheelcylinder piston is also in the frictional force of wheelcylinder cup and wheel cylinder, under the thrust of wheelsylinder spring, also stop motion.
Wheel cylinder assembly is the key components and parts mechanism of drum brake, and wheelcylinder piston is the executive component that wheel cylinder produces hydraulic pressure.
Conventional wheel cylinder assembly is made up of sealing function part 1, wheelcylinder piston 2 and 6, wheelsylinder spring 3, leather cup 4 and wheel cylinder 5, wheel cylinder internal piston structural type (seeing Fig. 1, Fig. 2) is the both sides of two Piston assemblings in wheel cylinder cylinder hole, wheel cylinder coordinates with piston clearance, in the middle of two pistons 2 and 6, be equipped with piston spring 3, the spring resistance of piston spring 3 can be pushed wheelcylinder piston to brake shoe parts, ensures that two-piston is positioned at fixing position of wheel cylinder under non-braking state.Piston spring adopts post spring more, and wheelcylinder piston is processed with positioning seat, and wheelsylinder spring is fixed between two pistons by positioning seat, prevents that spring because locating and cause disabler in wheel cylinder.But due to the existence of piston upper spring seat, the working space of spring has taken the length of thread engagement in wheelcylinder piston and wheel cylinder cylinder hole, therefore the effective travel in wheel cylinder of single piston will reduce, along with the wearing and tearing of the friction material on brake shoe parts in the continuous braking process of automobile, two pistons, with respect to constantly side shifting outside wheel cylinder of wheel cylinder, can only ensure that wheel cylinder assembly brake fluid does not occur and leaks by increasing axially effective active length in wheel cylinder cylinder hole.
Summary of the invention
The utility model provides a kind of drum brake wheel cylinder piston structure, and to solve effective working stroke deficiency of wheelcylinder piston, the easy eccentric wear of wheelcylinder piston, makes the problem reducing the working life of wheel cylinder assembly.
The technological scheme that the utility model is taked is: comprise sealing function part, wheelcylinder piston one and wheelcylinder piston two, leather cup and wheel cylinder, there are respectively wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two in wheelcylinder piston one and wheelcylinder piston two middle parts, connecting part, deep equality, equal diameters and the dead in line of this wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two, wheelsylinder spring is assemblied in wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two and by wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two and realizes self poisoning and the support to wheelcylinder piston one and wheelcylinder piston two.
The utility model has the advantages that: novel structure, save wheel cylinder spring taking up room in wheel cylinder cylinder hole, wheel cylinder assembly is meeting under the state of identical function size L1, be the length of thread engagement in wheelcylinder piston and wheel cylinder cylinder hole by the shared spatial transformation of the inner wheelsylinder spring of original wheel cylinder assembly, reduce the invalid length of wheelcylinder piston, increase the working stroke of wheelcylinder piston in wheel cylinder cylinder hole, improved the sealing reliability of wheelcylinder piston.Increase the axial length of thread engagement in wheelcylinder piston and wheel cylinder cylinder hole, keep the guidance quality of wheel cylinder cylinder hole to wheelcylinder piston, slow down, stop the eccentric wear phenomenon of wheelcylinder piston in braking process, increase the working life of wheel cylinder assembly, drum brake Security is improved.
Brief description of the drawings
Fig. 1 is the structural representation of this existing wheelcylinder piston in wheel cylinder;
Fig. 2 is wheel cylinder internal structure schematic diagram in Fig. 1;
Fig. 3 is structural representation of the present utility model;
Fig. 4 is the utility model wheel cylinder internal structure schematic diagram.
Embodiment
Comprise sealing function part 1, wheelcylinder piston 1 and wheelcylinder piston 26, leather cup 4 and wheel cylinder 5, there are respectively wheel cylinder spring positioning hole 1 and wheel cylinder spring positioning hole 2 601 in wheelcylinder piston 1 and wheelcylinder piston 26 middle parts, connecting part, the deep equality of this wheel cylinder spring positioning hole 1 and wheel cylinder spring positioning hole 2 601, equal diameters and dead in line, wheelsylinder spring 3 is assemblied in wheel cylinder spring positioning hole 1 and wheel cylinder spring positioning hole 2 601, and realize self poisoning and the support to wheelcylinder piston 1 and wheelcylinder piston 26 by wheel cylinder spring positioning hole 1 and wheel cylinder spring positioning hole 2 601.
By wheelsylinder spring 3 being assemblied in wheel cylinder spring positioning hole 1 and wheel cylinder spring positioning hole 2 601, reduce the invalid length of wheelcylinder piston, can increase the effective travel of wheelcylinder piston, improve the sealing reliability of wheelcylinder piston; Increase the axial length that coordinates in wheelcylinder piston and wheel cylinder cylinder hole, keep the guidance quality of wheel cylinder cylinder hole to wheelcylinder piston, slow down, stop the eccentric wear phenomenon of wheelcylinder piston in braking process, the working life of increase wheel cylinder assembly.
Claims (1)
1. a drum brake wheel cylinder piston structure, comprise sealing function part, wheelcylinder piston one and wheelcylinder piston two, leather cup and wheel cylinder, it is characterized in that: there are respectively wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two in wheelcylinder piston one and wheelcylinder piston two middle parts, connecting part, the deep equality of this wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two, equal diameters and dead in line, wheelsylinder spring is assemblied in wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two, and realize self poisoning and the support to wheelcylinder piston one and wheelcylinder piston two by wheel cylinder spring positioning hole one and wheel cylinder spring positioning hole two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320852646.3U CN203670564U (en) | 2013-12-23 | 2013-12-23 | Wheel cylinder piston structure of drum brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320852646.3U CN203670564U (en) | 2013-12-23 | 2013-12-23 | Wheel cylinder piston structure of drum brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203670564U true CN203670564U (en) | 2014-06-25 |
Family
ID=50966866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320852646.3U Expired - Fee Related CN203670564U (en) | 2013-12-23 | 2013-12-23 | Wheel cylinder piston structure of drum brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203670564U (en) |
-
2013
- 2013-12-23 CN CN201320852646.3U patent/CN203670564U/en not_active Expired - Fee Related
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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: 20140625 |