CN104002781A - Brake master cylinder - Google Patents
Brake master cylinder Download PDFInfo
- Publication number
- CN104002781A CN104002781A CN201410189735.3A CN201410189735A CN104002781A CN 104002781 A CN104002781 A CN 104002781A CN 201410189735 A CN201410189735 A CN 201410189735A CN 104002781 A CN104002781 A CN 104002781A
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- CN
- China
- Prior art keywords
- piston
- seal ring
- hole
- ante
- plane
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims description 24
- 238000001802 infusion Methods 0.000 claims description 23
- 210000002421 cell wall Anatomy 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 abstract description 24
- 238000007789 sealing Methods 0.000 abstract description 16
- 238000003860 storage Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Abstract
The invention aims at providing a brake master cylinder. The brake master cylinder can avoid risks of brake failures caused by the fact that sealing rings are abraded by a piston. The brake master cylinder comprises a cylinder barrel and the piston installed in the cylinder barrel, the front cavity sealing ring and the back cavity sealing ring are installed on the inner wall of the cylinder barrel, and a liquid compensation through hole is formed in the piston. The brake master cylinder is characterized in that the outer lateral face of the piston is provided with an annular groove surrounding the piston, and the liquid compensation through hole is formed in the annular groove; when the liquid compensation through hole of the piston is right opposite to the front cavity sealing ring, a gap is reserved between the front cavity sealing ring and the liquid compensation through hole. As the piston is located at the initial position, namely the liquid compensation through hole of the piston is right opposite to the front cavity sealing ring, the gap is reserved between the front cavity sealing ring and the liquid compensation through hole, the front cavity sealing ring cannot be sunk into the liquid compensation through hole, when the piston moves, the front cavity sealing ring cannot be damaged by the liquid compensation through hole, and the risks of the brake failures caused by the fact that the sealing rings are abraded by the piston are avoided.
Description
Technical field
The invention belongs to automobile brake technical field, specially refer to a kind of master brake cylinder.
Background technology
The mechanism of the current master brake cylinder for self-propelled vehicle is as follows: it comprises a cylinder barrel, in this cylinder barrel, be axially installed with at least one piston, this piston can be moved by vehicle driver's effect forward or backward, pressure release backward, forward for applying braking force, and piston relies on elastic component effect return backward; On described piston barrel, be radially uniformly distributed some through holes, for fluid infusion and liquid backflow; In described master brake cylinder cylinder barrel, also comprise one in front and one in back two seal rings, these seal rings are arranged on by constant spacing in the circular groove of inner wall of cylinder, and described seal ring supplies liquid chamber and a Ge Qian pressure chamber be separated out one in cylinder barrel after; Described master cylinder body comprises that one for passage, and this passage is connected with rear outside fluid reservoir for liquid chamber, and this channel setting is between two seal rings; On described master cylinder body, also have a perforation, it is passed in front pressure chamber, for carrying liquid to brake piping; Master brake cylinder also comprises for being communicated with front pressure chamber and the rear device for liquid chamber, and when the axis of the piston is when moving forward, this device can be turn-offed by piston, with this realize front pressure chamber with rear for mutually the completely cutting off of liquid chamber, thereby in front pressure chamber, set up brake-pressure.
On market, existing plunger typed master cylinder piston is in the time of initial position, its seal ring lip contacts with the through hole of piston, the diameter of piston hole is generally larger, and production process complexity is difficult for through hole edge to carry out fillet processing, seal ring lip is due to distortion, part can be trapped in piston hole inside, in snap catch process, piston can be in cylinder barrel crank motion continually, wearing and tearing meeting to seal ring lip is more serious, has the risk of braking failure.
Summary of the invention
The object of the invention is to propose a kind of master brake cylinder, this master brake cylinder can be avoided the risk of the braking failure being caused by piston wear because of seal ring.
Master brake cylinder of the present invention comprises cylinder barrel and is installed on the piston in cylinder barrel, described inner wall of cylinder is provided with ante-chamber seal ring and back cavity seal ring, described piston is provided with fluid infusion through hole, key is that the lateral surface of described piston is provided with the annular groove around piston, and described fluid infusion through hole is arranged in annular groove; When the fluid infusion through hole of piston is during just to ante-chamber seal ring, between described ante-chamber seal ring and fluid infusion through hole, there is gap.
Because piston is at initial position, be that the fluid infusion through hole of piston is during just to ante-chamber seal ring, between described ante-chamber seal ring and fluid infusion through hole, there is gap, therefore now ante-chamber seal ring can't be trapped in fluid infusion through hole, in the time that piston moves, fluid infusion through hole also just can not cause damage to ante-chamber seal ring, makes master brake cylinder can avoid the risk of the braking failure being caused by piston wear because of seal ring.In the time that the annular groove of piston departs from ante-chamber seal ring, ante-chamber seal ring will contact with piston wall, realizes normal sealing function.
Further, described annular groove is transition inclined-plane away from the cell wall of piston-advance direction, in the time of piston-advance, ante-chamber seal ring can contact with the cell wall of annular groove, and because this cell wall is inclined-plane, therefore the contact force of cell wall and ante-chamber seal ring is to increase gradually instead of increase suddenly, ante-chamber seal ring only can be subject to the friction force of piston wall like this, impulsive force between the two can be very little, contributes to reduce the damage of ante-chamber seal ring.
Further, described transition inclined-plane is formed by connecting by the first inclined-plane and the second inclined-plane, and described the first inclined-plane is than the second inclined-plane near piston-advance direction, and the angle of inclination on the first inclined-plane is greater than the angle of inclination on the second inclined-plane.In the time of braking, piston can move forward, and first the first inclined-plane of piston can contact with ante-chamber seal ring, because the angle of inclination on the first inclined-plane is larger, therefore can realize rapidly the sealing between piston and ante-chamber seal ring, reaches the object of snap catch; The second inclined-plane with primary piston just can contact with ante-chamber seal ring, strengthens gradually the sealing between piston and ante-chamber seal ring, thereby larger braking force is provided, and makes braking more reliable.
Further, the bearing of trend of the lip of described ante-chamber seal ring is towards piston-advance direction, and when piston-advance, the friction force that piston imposes on the lip of ante-chamber seal ring is the bearing of trend along lip like this, can not cause the distortion of lip folding etc., thereby reduce the infringement to lip.
Or described ante-chamber seal ring is cambered surface towards the side of piston, so also can reduces piston and impose on the impulsive force of ante-chamber seal ring, thereby improve the service life of ante-chamber seal ring.
Certainly, can also arrange like this: described annular groove is smooth curved surface away from the cell wall of piston-advance direction, and the cell wall of smooth curved surface also can reduce the damage of ante-chamber seal ring.
Further, described annular groove is inclined-plane or smooth curved surface near the cell wall of piston-advance direction, while getting back to initial position when piston moves backward like this, can make braking liquid along inclined-plane or smooth curved surface flow, thereby in annular groove, form comparatively gentle eddy current, finally flow back in liquid storage cylinder, not only can reduce braking liquid in the annular groove resistance to piston, and can reduce the impact to ante-chamber seal ring lip.
Master brake cylinder of the present invention is by redesigning master cylinder piston, fluid infusion through hole and the seal ring of piston are not come in contact, fundamentally eliminate the friction between piston hole hole wall and seal ring, greatly reduced the risk that brake system inefficacy seriously occurs because of ring wear.
Brief description of the drawings
Fig. 1 is the integral structure schematic diagram of master brake cylinder.
Fig. 2 is the cross-sectional view of piston.
Fig. 3 is the local structure schematic diagram in forward and backward two chambeies of master brake cylinder.
Fig. 4 is the local structure enlarged drawing of the fluid infusion through hole of piston.
Detailed description of the invention
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is described in further detail as effect and the principle of work etc. of the mutual alignment between the shape of related each member, structure, each several part and annexation, each several part.
Embodiment 1:
As shown in the figure, the master brake cylinder of the present embodiment comprises cylinder body 1, piston 2, back cavity seal ring 3, ante-chamber seal ring 4, Compress Spring 6.
Described cylinder body 1 has assembled liquid storage cylinder 11, through hole 12, fluid infusion chamber 13, back cavity seal groove 14, ante-chamber seal groove 15; Wherein back cavity seal ring 3 is fixed in back cavity seal groove 14, and the space between back cavity seal ring 3 and ante-chamber seal ring 4 has formed the low-pressure cavity of master cylinder inside, by liquid storage through hole 12 and liquid storage cylinder 11 UNICOMs, for supplementing braking liquid; Ante-chamber seal ring 4 is fixed in ante-chamber seal groove 15, comprises base portion 42, lip 41, and in the time that braking is not worked, inner front and back chamber communicates with one another, and internal pressure is zero substantially; When braking is worked, the isolated space of its front end has formed building of master cylinder and has pressed chamber 5.
The lateral surface of piston 2 is provided with the annular groove 21 around piston 2, interior several fluid infusion through holes 22 that is evenly provided with of annular groove 21; When the fluid infusion through hole 22 of piston 2 is during just to ante-chamber seal ring 4, between the lip 41 of described ante-chamber seal ring 4 and fluid infusion through hole 22, there is gap.
Because piston 2 is at initial position, be that the fluid infusion through hole 22 of piston 2 is during just to ante-chamber seal ring 4, between described ante-chamber seal ring 4 and fluid infusion through hole 22, there is gap, therefore now ante-chamber seal ring 4 can't be trapped in fluid infusion through hole 22, in the time that piston 2 moves, fluid infusion through hole 22 also just can not cause damage to ante-chamber seal ring 4, and master brake cylinder can be avoided because seal ring is by the wear and tear risk of the braking failure causing of piston 2.In the time that the annular groove 21 of piston 2 departs from ante-chamber seal ring 4, ante-chamber seal ring 4 will contact with piston 2 walls, realizes normal sealing function.
Further, described annular groove 21 is transition inclined-plane away from the cell wall of piston 2 working direction, transition inclined-plane is formed by connecting by the first inclined-plane 23 and the second inclined-plane 24,23 to the second inclined-planes 24, described the first inclined-plane are near piston 2 working direction, and the angle of inclination on the first inclined-plane 23 is greater than the angle of inclination on the second inclined-plane 24.In the time that piston 2 advances, ante-chamber seal ring 4 can contact with the cell wall of annular groove 21, and because this cell wall is inclined-plane, therefore the contact force of cell wall and ante-chamber seal ring 4 is to increase gradually instead of increase suddenly, 4 of ante-chamber seal rings can be subject to the friction force of piston 2 walls like this, impulsive force between the two can be very little, contributes to reduce the damage of ante-chamber seal ring 4.
In addition, in the time of braking, piston 2 can move forward, first the first inclined-plane 23 of piston 2 can contact with ante-chamber seal ring 4, because the angle of inclination on the first inclined-plane 23 is larger, therefore can realize rapidly the sealing between piston 2 and ante-chamber seal ring 4, reach the object of snap catch; The second inclined-plane 24 with primary piston 2 just can contact with ante-chamber seal ring 4, strengthens gradually the sealing between piston 2 and ante-chamber seal ring 4, thereby larger braking force is provided, and makes braking more reliable.
Further, the bearing of trend of the lip 41 of described ante-chamber seal ring 4 is towards piston 2 working direction, when piston 2 advances like this, the friction force that piston 2 imposes on the lip 41 of ante-chamber seal ring 4 is the bearing of trend along lip 41, can not cause the distortion of lip 41 folding etc., thereby reduce the infringement to lip 41.
Further, described annular groove 21 is inclined-plane or smooth curved surface near the cell wall 25 of piston 2 working direction, while getting back to initial position when piston 2 moves backward like this, can make braking liquid along inclined-plane or smooth curved surface flow, thereby the eddy current comparatively easing up in the interior formation of annular groove 21, finally flow back in liquid storage cylinder 11, not only can reduce braking liquid in annular groove 21 resistance to piston 2, and can reduce the impact to ante-chamber seal ring lip 41.
Claims (7)
1. a master brake cylinder, comprise cylinder barrel and be installed on the piston in cylinder barrel, described inner wall of cylinder is provided with ante-chamber seal ring and back cavity seal ring, described piston is provided with fluid infusion through hole, the lateral surface that it is characterized in that described piston is provided with the annular groove around piston, and described fluid infusion through hole is arranged in annular groove; When the fluid infusion through hole of piston is during just to ante-chamber seal ring, between described ante-chamber seal ring and fluid infusion through hole, there is gap.
2. master brake cylinder according to claim 1, is characterized in that described annular groove is transition inclined-plane away from the cell wall of piston-advance direction.
3. master brake cylinder according to claim 2, it is characterized in that described transition inclined-plane is formed by connecting by the first inclined-plane and the second inclined-plane, described the first inclined-plane is than the second inclined-plane near piston-advance direction, and the angle of inclination on the first inclined-plane is greater than the angle of inclination on the second inclined-plane.
4. according to the master brake cylinder described in claim 1 or 2 or 3, it is characterized in that the bearing of trend of lip of described ante-chamber seal ring is towards piston-advance direction.
5. according to the master brake cylinder described in claim 1 or 2 or 3, it is characterized in that described ante-chamber seal ring is cambered surface towards the side of piston.
6. master brake cylinder according to claim 1, is characterized in that described annular groove is smooth curved surface away from the cell wall of piston-advance direction.
7. according to the master brake cylinder described in claim 1 or 2 or 3 or 6, it is characterized in that described annular groove is inclined-plane or smooth curved surface near the cell wall of piston-advance direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410189735.3A CN104002781B (en) | 2014-05-07 | 2014-05-07 | Brake master cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410189735.3A CN104002781B (en) | 2014-05-07 | 2014-05-07 | Brake master cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104002781A true CN104002781A (en) | 2014-08-27 |
| CN104002781B CN104002781B (en) | 2017-01-11 |
Family
ID=51363775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410189735.3A Active CN104002781B (en) | 2014-05-07 | 2014-05-07 | Brake master cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104002781B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108349478A (en) * | 2015-11-20 | 2018-07-31 | 怡来汽车电子底盘系统有限公司 | For motor vehicle master cylinder |
| CN108749797A (en) * | 2018-05-30 | 2018-11-06 | 长春诚成汽车零部件有限公司 | A kind of novel integral type master cylinder of nourishing |
| DE102016011513B4 (en) | 2015-09-25 | 2021-12-16 | Mando Corporation | Master cylinder for a braking system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050044852A1 (en) * | 2003-09-03 | 2005-03-03 | Kaoru Tsubouchi | Brake master cylinder and manufacturing method therefor |
| DE102006022551B3 (en) * | 2006-05-15 | 2007-10-11 | Lucas Automotive Gmbh | Main cylinder, for a vehicle hydraulic brake, has a sliding piston forming a gap between its surface and the seal when moving against the operating direction to prevent an abrupt equalizing on an underpressure |
| CN101655158B (en) * | 2008-08-22 | 2012-04-18 | 株式会社万都 | Sealing member for master cylinder and master cylinder having the same |
| CN102803035A (en) * | 2009-06-16 | 2012-11-28 | 罗伯特博世有限公司 | Cup of a master cylinder, a master cylinder provided with such cups |
| DE102012014321A1 (en) * | 2012-07-19 | 2014-01-23 | Lucas Automotive Gmbh | Master brake cylinder for a motor vehicle brake system with profiled pressure piston |
-
2014
- 2014-05-07 CN CN201410189735.3A patent/CN104002781B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050044852A1 (en) * | 2003-09-03 | 2005-03-03 | Kaoru Tsubouchi | Brake master cylinder and manufacturing method therefor |
| DE102006022551B3 (en) * | 2006-05-15 | 2007-10-11 | Lucas Automotive Gmbh | Main cylinder, for a vehicle hydraulic brake, has a sliding piston forming a gap between its surface and the seal when moving against the operating direction to prevent an abrupt equalizing on an underpressure |
| CN101655158B (en) * | 2008-08-22 | 2012-04-18 | 株式会社万都 | Sealing member for master cylinder and master cylinder having the same |
| CN102803035A (en) * | 2009-06-16 | 2012-11-28 | 罗伯特博世有限公司 | Cup of a master cylinder, a master cylinder provided with such cups |
| DE102012014321A1 (en) * | 2012-07-19 | 2014-01-23 | Lucas Automotive Gmbh | Master brake cylinder for a motor vehicle brake system with profiled pressure piston |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016011513B4 (en) | 2015-09-25 | 2021-12-16 | Mando Corporation | Master cylinder for a braking system |
| CN108349478A (en) * | 2015-11-20 | 2018-07-31 | 怡来汽车电子底盘系统有限公司 | For motor vehicle master cylinder |
| CN108349478B (en) * | 2015-11-20 | 2021-01-26 | 怡来汽车电子底盘系统有限公司 | Master cylinder for vehicle |
| CN108749797A (en) * | 2018-05-30 | 2018-11-06 | 长春诚成汽车零部件有限公司 | A kind of novel integral type master cylinder of nourishing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104002781B (en) | 2017-01-11 |
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