CN205331291U - Single piston braking wheel cylinder with braking clearance automatic compensating device - Google Patents
Single piston braking wheel cylinder with braking clearance automatic compensating device Download PDFInfo
- Publication number
- CN205331291U CN205331291U CN201521012566.2U CN201521012566U CN205331291U CN 205331291 U CN205331291 U CN 205331291U CN 201521012566 U CN201521012566 U CN 201521012566U CN 205331291 U CN205331291 U CN 205331291U
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- CN
- China
- Prior art keywords
- piston
- cylinder body
- groove
- braking
- hydraulic cavities
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- Expired - Fee Related
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Abstract
The utility model discloses a single piston braking wheel cylinder with braking clearance automatic compensating device, comprising a cylinder body, cylinder body one side is connected with outside braking bottom plate, the cylinder body opposite side is equipped with the piston chamber, the piston intracavity is equipped with the piston, the piston forms the hydraulic pressure chamber with the bottom in piston chamber, the inlet port has still been seted up on the cylinder body, the inlet port communicates with each other with the hydraulic pressure chamber, still include the friction ring, friction ring outer wall and cylinder body inner wall hot pressing laminating, first recess has been seted up on the piston, friction ring inner wall loop is on first recess, still be equipped with the extension spring between piston and the hydraulic pressure chamber. This scheme is through setting up the friction ring, and when the distance in braking clearance, the position of friction ring also will change corresponding distance under the effect of brake fluid to make the braking clearance maintain set value, realized the automatic compensation in braking clearance, guaranteed the form safety of vehicle.
Description
Technical field
This utility model relates to wheel cylinder, is specially a kind of single-piston wheel cylinder with braking gap automatic compensator。
Background technology
Drum brake is the braking executive device in brakes, is the critical component in brake system of car, and the element of drum brake is fewer than disk brake, simple in construction, and manufacturing cost is relatively low。
When using drum brake braking, piston in hydraulic drive wheel cylinder is displaced outwardly, wheelcylinder piston promotes brake-shoe near brake drum again, brake-shoe and brake drum produce frictional resistance and stop the rotation of wheel, wherein the gap between brake-shoe and brake drum is called brake clearance, in order to ensure the normal traveling of automobile, best brake clearance should be kept between brake-shoe and brake drum, tradition drum brake is in use for some time, the brake clearance made between brake-shoe and brake drum is increased by brake-shoe due to abrasion, increasing of brake clearance will have influence on the normal traveling of vehicle。
Utility model content
This utility model is intended to provide a kind of single-piston wheel cylinder with braking gap automatic compensator, with the problem having influence on normal vehicle operation owing to solving brake clearance increase。
The single-piston wheel cylinder with braking gap automatic compensator in this programme, including cylinder body, cylinder body side is connected with outer brake base plate, cylinder body opposite side is provided with plunger shaft, piston it is provided with in plunger shaft, hydraulic cavities is formed on the bottom of piston and plunger shaft, cylinder body is further opened with fuel feed hole, fuel feed hole communicates with hydraulic cavities, also include drag ring, drag ring outer wall and inboard wall of cylinder block hot pressing laminating, piston offers the first groove, drag ring inwall kink is on the first groove, extension spring it is additionally provided with between piston and hydraulic cavities, extension spring one end and hydraulic cavities offset, the extension spring other end and piston offset, the active force of extension spring is less than the active force between drag ring outer wall and inboard wall of cylinder block。
The principle of this programme is and effect is: when needs are braked, high-pressure brake liquid enters hydraulic cavities by the fuel feed hole on cylinder body, piston under the effect of high-pressure brake liquid by outer shifting, when the end face that the first groove is positioned at hydraulic cavities side offsets with drag ring, piston and brake-shoe offset and then realize braking action, when due to abrasion, brake-shoe causes that brake clearance becomes big, first groove is positioned at when the end face of hydraulic cavities side offsets with drag ring will there is also brake clearance, now under the effect of high-pressure brake liquid, drag ring will continue to be displaced outwardly with piston, until brake clearance is completely eliminated, drag ring now will be in new position, after braking completes, piston back moves under the effect of extension spring, owing to the active force of extension spring is not enough to the active force that overcomes between drag ring and cylinder body, therefore when the first groove offsets away from end face and the drag ring of hydraulic cavities side, piston is carried out spacing by drag ring, piston and drag ring all will be in new position, and the distance that piston and drag ring move is exactly the distance that brake clearance increases。
This programme is by arranging drag ring, when the distance of brake clearance changes, the position of drag ring also by changing corresponding distance under the effect of brake fluid, so that brake clearance maintains set value, achieve the automatic compensation of brake clearance, it is ensured that the form safety of vehicle。
Further, in order to make to keep between piston and hydraulic cavities suitable oil-feed gap, piston is provided with the projection keeping oil-feed gap towards hydraulic cavities side, and projection has tapering。
Further, in order to prevent outside moisture and dust from entering, having influence on the normal operation of wheel cylinder, cylinder body offers draw-in groove, piston is provided with the second groove, and draw-in groove place is provided with protective cover, and protective cover side is positioned over draw-in groove, and protective cover opposite side is positioned over the second groove。
Further, in order to discharge the air in high-pressure brake liquid, cylinder body being further opened with air vent, air vent communicates with hydraulic cavities, and air vent place is additionally provided with vent valve and vent valve protection screw。
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model embodiment。
Fig. 2 is the sectional view of Fig. 1 embodiment A-A。
Detailed description of the invention
Below by detailed description of the invention, this utility model is described in further detail:
Accompanying drawing labelling in Figure of description includes: cylinder body 1, extension spring 2, piston 3, drag ring 4, protective cover the 5, first groove 6, fuel feed hole 7, air vent 8, vent valve 9, vent valve protection screw 10。
Embodiment is substantially as shown in Figure 2: have the single-piston wheel cylinder of braking gap automatic compensator, including cylinder body 1, the left side of cylinder body 1 offers screw, cylinder body 1 is connected with outer brake base plate by the screw in left side, right side opening at cylinder body 1 is provided with piston 3 chamber, being further opened with draw-in groove on the right side outer contour of cylinder body 1, the outer contour on the right side of cylinder body 1 is the combination of irregular curve and straight line。
Piston 3 intracavity at cylinder body 1 is provided with piston 3, hydraulic cavities is formed between left side and piston 3 chamber of piston 3, position on the left of piston 3 is additionally provided with projection, this projection is the left narrow right wide shape with certain taper, all there is the chamfering of circular arc this projection and piston 3 joint, it is provided with the first groove 6 on the right side of piston 3 projection, the outer profile size of the first groove 6 left end face is slightly less than the outer profile size of the first groove 6 its right end face, it is additionally provided with the second groove on the right side of the first groove 6, the upside end face of the second groove is inclined-plane, the end face of piston 3 rightmost side will offset with outer brake hoof when braking。
Being provided with both sides extension spring 2 on the left of piston 3 and between hydraulic cavities, two extension spring 2 settings symmetrical above and below, one end of extension spring 2 and hydraulic cavities offset, and the other end of extension spring 2 and piston 3 offset, and upon completion of the braking, piston 3 back will move under the effect of extension spring 2。
It is additionally provided with drag ring 4 at the inwall place of cylinder body 1, the inwall of the outer wall of drag ring 4 and cylinder body 1 adopts the mode of interference fit, pressure between drag ring 4 and cylinder body 1 is more than the active force of two extension springs 2, the inwall kink of drag ring 4 is at the first groove 6 of piston 3, when the left side of piston 3 first groove 6 is for before offseting with drag ring 4, piston 3 can move freely, and after the left side of the first groove 6 contacts with drag ring 4, piston 3 moves under the effect of high-pressure brake liquid together by driving drag ring 4。
The second groove at piston 3 is additionally provided with protective cover 5, and the second groove is located in one end of protective cover 5, and protective cover 5 other end is located on the draw-in groove of cylinder body 1。
As shown in Figure 1, it is further opened with fuel feed hole 7 in the left side of cylinder body 1, fuel feed hole 7 communicates with hydraulic cavities, during braking, high-pressure brake liquid will enter hydraulic cavities from fuel feed hole 7, be also arranged above air vent 8 at fuel feed hole 7, and air vent 8 communicates with hydraulic cavities, be additionally provided with vent valve 9 and vent valve protection screw 10 at air vent 8 place, vent valve 9 makes air can only discharge in hydraulic cavities and can not enter in hydraulic cavities from。
Above-described is only embodiment of the present utility model, and in scheme, the general knowledge such as known concrete structure and characteristic does not do too much description at this。Should be understood that; for a person skilled in the art, under the premise without departing from this utility model structure, it is also possible to make some deformation and improvement; these also should be considered as protection domain of the present utility model, and these are all without affecting effect and the practical applicability that this utility model is implemented。The protection domain that this application claims should be as the criterion with the content of its claim, and the detailed description of the invention in description etc. records the content that may be used for explaining claim。
Claims (4)
1. a single-piston wheel cylinder with braking gap automatic compensator, including cylinder body, described cylinder body side is connected with outer brake base plate, described cylinder body opposite side is provided with plunger shaft, it is provided with piston in described plunger shaft, described piston can offset with outer brake hoof, hydraulic cavities is formed on the bottom of described piston and described plunger shaft, described cylinder body is further opened with fuel feed hole, described fuel feed hole communicates with described hydraulic cavities, it is characterized in that, also include drag ring, described drag ring outer wall and described inboard wall of cylinder block hot pressing laminating, described piston offers the first groove, described drag ring inwall kink is on described first groove, it is additionally provided with extension spring between described piston and described hydraulic cavities, described extension spring one end and described hydraulic cavities offset, the described extension spring other end and described piston offset, the active force of described extension spring is less than the active force between described drag ring outer wall and described inboard wall of cylinder block。
2. the single-piston wheel cylinder with braking gap automatic compensator according to claim 1, it is characterised in that: described piston is provided with the projection keeping oil-feed gap towards described hydraulic cavities side, and described projection has tapering。
3. the single-piston wheel cylinder with braking gap automatic compensator according to claim 2, it is characterized in that: described cylinder body offers draw-in groove, described piston is provided with the second groove, described draw-in groove place is provided with protective cover, described protective cover side is positioned over described draw-in groove, and described protective cover opposite side is positioned over described second groove。
4. the single-piston wheel cylinder with braking gap automatic compensator according to claim 3, it is characterized in that: described cylinder body is further opened with air vent, described air vent communicates with described hydraulic cavities, and described air vent place is additionally provided with vent valve and vent valve protection screw。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521012566.2U CN205331291U (en) | 2015-12-09 | 2015-12-09 | Single piston braking wheel cylinder with braking clearance automatic compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521012566.2U CN205331291U (en) | 2015-12-09 | 2015-12-09 | Single piston braking wheel cylinder with braking clearance automatic compensating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205331291U true CN205331291U (en) | 2016-06-22 |
Family
ID=56211471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521012566.2U Expired - Fee Related CN205331291U (en) | 2015-12-09 | 2015-12-09 | Single piston braking wheel cylinder with braking clearance automatic compensating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205331291U (en) |
-
2015
- 2015-12-09 CN CN201521012566.2U patent/CN205331291U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160622 Termination date: 20161209 |