CN2758139Y - Hydraulic brake master pump - Google Patents
Hydraulic brake master pump Download PDFInfo
- Publication number
- CN2758139Y CN2758139Y CN 200420115025 CN200420115025U CN2758139Y CN 2758139 Y CN2758139 Y CN 2758139Y CN 200420115025 CN200420115025 CN 200420115025 CN 200420115025 U CN200420115025 U CN 200420115025U CN 2758139 Y CN2758139 Y CN 2758139Y
- Authority
- CN
- China
- Prior art keywords
- piston
- hole
- fuel feed
- sealing member
- feed hole
- 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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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The utility model relates to a hydraulic brake master pump, which comprises a pump body, sealing members, an oil storage chamber, a first oil inlet hole, a second oil inlet hole, a first oil outlet hole, a second oil outlet hole, a first piston, a second piston, a first piston return spring and a second piston return spring. The utility model is characterized in that both the first and the second pistons are tubular pistons, one end of each of which is opened, wherein the opening directions of the first and the second pistons are consistent; the first oil outlet hole is communicated with an inner cavity of the first piston; the second oil outlet hole is communicated with an inner cavity of the second piston; the space of the inner cavity of the first piston and the space of the inner cavity of the second piston are mutually separated; the side wall of the first piston is provided with first through holes communicated with the inner cavity of the first piston; the side wall of the second piston is provided with second through holes communicated with the inner cavity of the second piston; the inner wall of the pump body is provided with a first and a second sealing members which are respectively matched with the first piston and the second piston.
Description
Technical field
The utility model relates to a kind of hydraulic braking master cylinder.
Background technology
Existing hydraulic braking master cylinder comprises the pump housing, sealing member, oil cabinet, first fuel feed hole, second fuel feed hole, first oil outlet, second oil outlet, first piston, second piston, the first piston retracing spring and second piston reset spring, wherein, the oil cabinet and first fuel feed hole, second fuel feed hole is connected, sealing member is nested with respectively on the first piston and second piston, the first piston and second piston axially are nested with in the pump housing successively, the first piston retracing spring is placed in the pump housing and with first piston and contacts, and second piston reset spring is placed in the pump housing and with second piston and contacts.Under normal conditions, when promptly piston not being applied external force, first piston retracing spring pushing tow first piston allows first fuel feed hole be connected with first oil outlet, the second piston reset spring pushing tow, second piston allows second fuel feed hole be connected with second oil outlet, and separate mutually in the fluid that the fluid that first piston will promote and second piston will promote shared space in the pump housing.This hydraulic braking master cylinder is used for automobile brake system more, also will be connected with the brake pedal that chaufeur will be handled through vacuum booster unit usually again.When chaufeur depresses brake pedal, stressed and the compression first piston retracing spring of first piston in the hydraulic braking master cylinder, first piston axial motion and sealing (separating first fuel feed hole and first through hole) first fuel feed hole, allow the interior fluid pressurized of the pump housing flow to first oil outlet and to promote second piston, second piston is stressed and compress second piston reset spring, second piston and first piston move in the same way and seal second fuel feed hole, allow the interior fluid pressurized of the pump housing flow out through second oil outlet, at this moment, the brake fluid of pressurized will enter brake system and allow braking automobile.In actual driver behavior, chaufeur can lower the speed of a motor vehicle by continuous apply the brakes in order to guarantee traffic safety, the corresponding first piston and second piston in the pump housing will constantly be made axial motion, and the sealing member that is nested with on two-piston also can constantly rub with pump housing inwall mutually.But, the problem that causes thus is: the requirement on machining accuracy to pump housing inwall is higher, the corresponding difficulty of processing that increased, if the pump housing inwall of processing and fabricating seems coarse, then can not satisfy sealing member and the frequent friction of pump housing inwall also will keep the condition of excellent sealing effect, allow the situation of seal failure, will directly cause automobile brake system to lose efficacy in case the sealing member early failure occurs, thereby accidents caused, cause damage, even the cost that allows chaufeur give one's life for.Therefore, existing hydraulic braking master cylinder exists defective, need improve.
The utility model content
The purpose of this utility model is that the structure of existing hydraulic braking master cylinder is improved, and a kind of making, non-damageable hydraulic braking master cylinder of sealing member be convenient to is provided.
Hydraulic braking master cylinder of the present utility model comprises the pump housing, sealing member, oil cabinet, first fuel feed hole, second fuel feed hole, first oil outlet, second oil outlet, first piston, second piston, the first piston retracing spring and second piston reset spring, the described oil cabinet and first fuel feed hole, second fuel feed hole is connected, the described first piston and second piston axially are nested with in the pump housing successively, described first piston retracing spring is placed in the pump housing and with first piston and contacts, described second piston reset spring is placed in the pump housing and with second piston and contacts, it is characterized in that the described first piston and second piston are the trunk piston of an end opening, and first piston is consistent with the opening direction of second piston, described first oil outlet and first piston intracavity inter-connection, described second oil outlet is connected with second piston cavity, separate mutually in the described first piston intracavity space and the second piston cavity space, offer first through hole on the sidewall of described first piston with the intracavity inter-connection of first piston, offer second through hole on the sidewall of described second piston with the intracavity inter-connection of second piston, described pump housing inwall is provided with first sealing member and second sealing member that matches with the first piston and second piston respectively, the sealing member of described first sealing member for when described first piston retracing spring is compressed, described first through hole and first fuel feed hole being separated mutually, the sealing member of described second sealing member for when described second piston reset spring is compressed, described second through hole and second fuel feed hole being separated mutually, the retracing spring of described first piston retracing spring for first piston is applied elastic reset power and allows first fuel feed hole be connected with first through hole, the retracing spring of described second piston reset spring for second piston is applied elastic reset power and allows second fuel feed hole be connected with second through hole.
In the utility model, above-mentioned first piston retracing spring promptly is the retracing spring that allows first fuel feed hole be connected with first through hole under the effect of elastic reset power, and above-mentioned second piston reset spring promptly is the retracing spring that allows second fuel feed hole be connected with second through hole under the effect of elastic reset power.
Aspect product processing, because the processing of pump housing inwall is subjected to space constraint, requirement condition height, method difficulty.By contrast, the processing piston outer wall can pump housing inwall cost be low than processing, precision can be processed De Genggao, the sealing member that is installed in the utility model on the pump housing inwall can be higher than the number of times that existing sealing member and the pump housing inwall that is installed on the piston outer wall rubs far away with piston outer wall friction number of times, so, sealing member in the utility model just has good sealing effect and long-lived characteristics, and can effectively reduce the making and the use cost of the whole parts of hydraulic braking master cylinder.
In the utility model, as long as have on the pump housing with at pump body inner shaft to the adapt installation site of sealing member of the piston of motion, can allow piston movable to freedom at pump body inner shaft, all the other cavity shapes in the pump housing just can be made as arbitrary shape, thereby make pump housing processing more convenient, more flexible, simultaneously, after having satisfied above-mentioned condition, when the pump housing is made even can the parameters such as inwall degree of finish of the pump housing not done special requirement, this is also just for the more broad approach that provides that further improves is provided on pump body structure.
The utility model holds the fluid that is used to brake with the inner chamber of trunk piston, the corresponding space that occupies in the pump housing than other forms of piston is little, can allow the hydraulic braking master cylinder integral structure compacter, volume is smaller and more exquisite, install more convenient, the corresponding volume that has increased fluid in the pump housing inner chamber simultaneously, when chaufeur depress pedal by piston at pump body inner shaft during to motion, just can promote more fluid, can allow brake system sensitiveer, the reaction rapider.
Above-mentioned oil cabinet can be multiple structure situation, as: be directly fixed on the integral type oil cabinet on the outer wall of cylinder block, on oil cabinet, offer the doubly-linked interface and communicate, or be individually fixed in two independent oil cabinets on the outer wall of cylinder block, offer communication port respectively and communicate or the like with inner chamber of cylinder block with inner chamber of cylinder block.
Sealing member in the utility model can require to be made into various structures according to reality, as: have unidirectional vacuum action and replenish the seal ring of oil cylinder inner fluid or superimposed successively multi-layer sealed external member etc.
Compared with the aforementioned existing similar products, hydraulic braking master cylinder of the present utility model has long service life, connects the structure compactness, volume is small and exquisite, easy for installation, advantage such as tooling cost is low and braking effect is better.Improvement of the present utility model has prevented the sealing member early failure effectively, has avoided the serious consequence of bringing because of the hydraulic braking master cylinder premature failure.
Content of the present utility model further illustrates with the following Examples, but content of the present utility model is not limited only to content related among the embodiment.
Description of drawings
Fig. 1 is the structural representation of hydraulic braking master cylinder among the embodiment.
Fig. 2 is the left view of Fig. 1.
The specific embodiment
Shown in Fig. 1～2, hydraulic braking master cylinder in the present embodiment comprises the pump housing 1, sealing member, oil cabinet 2, first fuel feed hole 3, second fuel feed hole 4, first oil outlet 5, second oil outlet 6, first piston 7, second piston 8, the first piston retracing spring 9 and second piston reset spring 10, the described oil cabinet 2 and first fuel feed hole 3, second fuel feed hole 4 is connected, the described first piston 7 and second piston 8 axially are nested with successively in the pump housing 1, described first piston retracing spring 9 is placed in the pump housing 1 and with first piston 7 and contacts, described second piston reset spring 10 is placed in the pump housing 1 and with second piston 8 and contacts, it is characterized in that the described first piston 7 and second piston 8 are the trunk piston of an end opening, and first piston 7 is consistent with the opening direction of second piston 8, described first oil outlet 5 and first piston 7 intracavity inter-connections, described second oil outlet 6 and second piston, 8 intracavity inter-connections, described first piston 7 intracavity spaces and second piston, 8 intracavity spaces are separated mutually, offer first through hole 11 on the sidewall of described first piston 7 with the intracavity inter-connection of first piston 7, offer second through hole 12 on the sidewall of described second piston 8 with the intracavity inter-connection of second piston 8, the described pump housing 1 inwall is provided with first sealing member 13 and second sealing member 14 that matches with the first piston 7 and second piston 8 respectively, the sealing member of described first sealing member 13 for when described first piston retracing spring 9 is compressed, described first through hole 11 and first fuel feed hole 3 being separated mutually, the sealing member of described second sealing member 14 for when described second piston reset spring 10 is compressed, described second through hole 12 and second fuel feed hole 4 being separated mutually, the retracing spring of described first piston retracing spring 9 for first piston 7 is applied elastic reset power and allows first fuel feed hole 3 be connected with first through hole 11, the retracing spring of described second piston reset spring 10 for second piston 8 is applied elastic reset power and allows second fuel feed hole 4 be connected with second through hole 12.
First sealing member 13 and second sealing member 14 that are provided with in the present embodiment are the sealing member with unidirectional fuel feeding worker energy.Be by second piston, 8 outer walls and the partition seal 15 that is arranged on the pump housing 1 inwall in the present embodiment, realize the mutual separation of first piston 7 intracavity spaces and second piston, 8 intracavity spaces,
When using the hydraulic braking master cylinder of present embodiment, under normal conditions, when promptly first piston 7 not being applied external force, first piston retracing spring 9 pushing tow first pistons 7, allow first fuel feed hole 3 be connected with first oil outlet 5, second piston reset spring, 10 pushing tows, second piston 8 allows second fuel feed hole 4 be connected with second oil outlet 6.At this moment, the fluid that is used to brake just enters first piston 7 inner chambers from oil cabinet 2 through first fuel feed hole 3 and first through hole 11, and the fluid in the oil cabinet 2 also enters second piston, 8 inner chambers through second fuel feed hole 4 and second through hole 12.When chaufeur depresses brake pedal, first piston 7 stressed and compression first piston retracing springs 9 in the hydraulic braking master cylinder, so first piston 7 axial motions also seal first fuel feed hole 3 (realizing the separation of first fuel feed hole 3 and first through hole 11 by first sealing member 13), allow the fluid pressurized in first piston 7 inner chambers flow to first oil outlet 5 and together to promote second piston 8 with first piston retracing spring 9 stressed and compression, second piston 8 is stressed and compress second piston reset spring 10, second piston 8 moves in the same way with first piston 7 and seals second fuel feed hole 4 (realizing the separation of second fuel feed hole 4 and second through hole 12 by second sealing member 14), allow the fluid pressurized in second piston, 8 inner chambers flow out through second oil outlet 6, at this moment, the brake fluid of pressurized will enter brake system, allows braking automobile.Behind the braking automobile, when the rapid releasing of brake pedal of chaufeur, first piston retracing spring 9 pushing tow first pistons 7 allow first piston 7 reset, second piston reset spring, 10 pushing tows, second piston 8 allows second piston 8 reset, can make short time generation vacuum effect in first piston 7 inner chambers and second piston, 8 inner chambers, first sealing member 13 that is provided with in the present embodiment will be yearned for fuel feeding in first piston 7 inner chambers by folk prescription, second sealing member 14 also can be yearned for fuel feeding in second piston, 8 inner chambers by folk prescription, make degree of vacuum decline in first piston 7 inner chambers and second piston, 8 inner chambers, the first piston 7 and second piston 8 can be resetted rapidly, and allow first piston 7 inner chambers as soon as possible, first fuel feed hole 3 is connected with first oil outlet 5, second piston, 8 inner chambers, second fuel feed hole 4 is connected with second oil outlet 6, oil liquid pressure in first piston 7 inner chambers, oil liquid pressure in second piston, 8 inner chambers and the oil liquid pressure balance in the oil cabinet 2 are so that carry out brake next time.
Claims (1)
1, a kind of hydraulic braking master cylinder, comprise the pump housing, sealing member, oil cabinet, first fuel feed hole, second fuel feed hole, first oil outlet, second oil outlet, first piston, second piston, the first piston retracing spring and second piston reset spring, the described oil cabinet and first fuel feed hole, second fuel feed hole is connected, the described first piston and second piston axially are nested with in the pump housing successively, described first piston retracing spring is placed in the pump housing and with first piston and contacts, described second piston reset spring is placed in the pump housing and with second piston and contacts, it is characterized in that the described first piston and second piston are the trunk piston of an end opening, and first piston is consistent with the opening direction of second piston, described first oil outlet and first piston intracavity inter-connection, described second oil outlet is connected with second piston cavity, separate mutually in the described first piston intracavity space and the second piston cavity space, offer first through hole on the sidewall of described first piston with the intracavity inter-connection of first piston, offer second through hole on the sidewall of described second piston with the intracavity inter-connection of second piston, described pump housing inwall is provided with first sealing member and second sealing member that matches with the first piston and second piston respectively, the sealing member of described first sealing member for when described first piston retracing spring is compressed, described first through hole and first fuel feed hole being separated mutually, the sealing member of described second sealing member for when described second piston reset spring is compressed, described second through hole and second fuel feed hole being separated mutually, the retracing spring of described first piston retracing spring for first piston is applied elastic reset power and allows first fuel feed hole be connected with first through hole, the retracing spring of described second piston reset spring for second piston is applied elastic reset power and allows second fuel feed hole be connected with second through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420115025 CN2758139Y (en) | 2004-10-29 | 2004-10-29 | Hydraulic brake master pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420115025 CN2758139Y (en) | 2004-10-29 | 2004-10-29 | Hydraulic brake master pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2758139Y true CN2758139Y (en) | 2006-02-15 |
Family
ID=36078283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420115025 Expired - Fee Related CN2758139Y (en) | 2004-10-29 | 2004-10-29 | Hydraulic brake master pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2758139Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102582601A (en) * | 2012-03-02 | 2012-07-18 | 同济大学 | Electric-hydro complex brake system employing integral brake master cylinder assembly |
| CN103619678A (en) * | 2011-06-17 | 2014-03-05 | 京西重工（上海）有限公司 | Master cylinder assembly in brake system |
-
2004
- 2004-10-29 CN CN 200420115025 patent/CN2758139Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103619678A (en) * | 2011-06-17 | 2014-03-05 | 京西重工（上海）有限公司 | Master cylinder assembly in brake system |
| US9657753B2 (en) | 2011-06-17 | 2017-05-23 | Bwi (Shanghai) Co., Ltd. | Master cylinder assembly in brake system |
| CN102582601A (en) * | 2012-03-02 | 2012-07-18 | 同济大学 | Electric-hydro complex brake system employing integral brake master cylinder assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |