CN103047411A - Plunger type master cylinder main piston - Google Patents
Plunger type master cylinder main piston Download PDFInfo
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- CN103047411A CN103047411A CN2011103113027A CN201110311302A CN103047411A CN 103047411 A CN103047411 A CN 103047411A CN 2011103113027 A CN2011103113027 A CN 2011103113027A CN 201110311302 A CN201110311302 A CN 201110311302A CN 103047411 A CN103047411 A CN 103047411A
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Abstract
The invention relates to a plunger type master cylinder main piston. By the aid of the main piston, the transmitting force of a booster can move along a hydraulic chamber of a cylinder. The main piston comprises a pressure relieving port and a residual pressure removing device, wherein one end of a main piston body, which faces towards a flowing piston, forms the pressure relieving port, the pressure relieving port penetrates into the inside and the outside of the main piston body from the circumferential direction of the main piston body and serves as an oil channel, the residual pressure removing device faces towards one end of the main piston body from the other end of the main piston body, the outer surface of the main piston body is recessed to form the residual pressure removing device, and the residual pressure removing device is used for removing the residual pressure of a master cylinder. A slot is formed on an input shaft, so that the residual pressure of the master cylinder is removed. The input shaft is processed, so that the cost and the processing number are reduced. Besides, the slot faces towards one end of the main piston body at the other end of the main piston body, the outer surface of the main piston body is recessed to form a I-shape, the slot cannot be blocked by foreign bodies of braking liquid, and the residual pressure removing function of the input shaft is improved further.
Description
Technical field
The present invention relates to a kind of plunger typed master cylinder, is to have the plunger typed master cylinder main piston technology of eliminating the residual voltage function specifically.
Background technique
General plunger typed master cylinder utilizes two pistons to form each self-hydraulic with main piston (Plunger typed Master Cylinder), and total length is shorter than common master cylinder, and has advantages of compacter.
Its another advantage is, the master cylinder internal face of plunger typed master cylinder forms a plurality of oil mass supplemental tank, is easy to brake fluid and flows and make still Channel Group of the brake fluid of ABS/TCS/ESP when low voltage activate.
Fig. 1 is one of above-mentioned plunger typed master cylinder example.
As shown in the figure, plunger typed master cylinder inside by hydraulic pressure cavity 1a, have the cylinder body 1 of the pouring orifice 1b that is connected with above-mentioned hydraulic pressure cavity 1a, the piston 2 that moves along above-mentioned hydraulic pressure cavity 1a by the strength that transmits from booster rocket, by above-mentioned main piston 2 receive mobile piston 3 that strength move along above-mentioned hydraulic pressure cavity 1a, to above-mentioned main piston 2 and above-mentioned mobile piston 3 provide elastic restoring force a pair of Returnning spring, be loaded in the cup groove 1c of above-mentioned cylinder body 1 and consist of with seal cup 5 that the surface of above-mentioned main piston 2 and above-mentioned mobile piston 3 contacts respectively.
The front end of above-mentioned main piston 2 has the relief port 2a with oil circuit effect, and the sideway stance of above-mentioned relief port 2a has the residual voltage of elimination device, i.e. safety vent 2b.
Under static (REST) state that pouring orifice 1b is connected with relief port 2a, do not have the poor of pressure between the hydraulic pressure cavity 1a of oil conservator and cylinder body 1, thereby it is smooth and easy that brake fluid is flowed.
Under the above-mentioned state of rest, brake petal starts by booster rocket, make main piston 2 under the state of Fig. 1 towards the left direction movement of advancing, block safety vent 2b when seal cup 5 can be blocked relief port 2a, make hydraulic pressure cavity 1a produce pressure, the state of this moment is called pressure generation state.
It is to form from the time point that above-mentioned safety vent 2b is blocked by above-mentioned seal cup 5 that break starts action.
After above-mentioned pressure generation state was eliminated with backward brake petal applied pressure, advance mobile main piston 2 and mobile piston 3 of direction retreated movement again to the right by Returnning spring 4 to the left under the state of Fig. 1, reverts to the state such as Fig. 1.
Then pouring orifice 1b and relief port 2a are connected again, and the brake fluid in the hydraulic pressure cavity 1a flows out oil conservator by relief port 2a and pouring orifice 1b thereupon, and the state of this moment is called pressure and eliminates state.
On the other hand, the pressure that above-mentioned pressure generation state puts on later on brake petal is eliminated, and main piston 2 borrows the power of Returnning spring 4 to reset, but pouring orifice 1b and relief port 2a not necessarily interconnect, and the state of this moment is called residual voltage generation state.
Above-mentioned residual voltage generation state is that size differs, when the reason such as tolerance build-up is disengaged braking, can't return to main piston 2 desired positions between the parts, causes 2a sealed cup 5 in relief port to block and occur.
As mentioned above, residual voltage generation state occuring, unload interior residual residual voltage because of main, braking is pressed can't generate smoothly and accident occurs in causing travelling.
For preventing these phenomenons, as the residual voltage cancellation element, in above-mentioned main piston 2, provide the safety vent 2b that runs through main piston 2 inside and outsides.
In other words, even without returning to main piston 2 desired positions, the sealed cup of relief port 2a 5 is blocked, but safety vent 2b can with on pouring orifice 1b be connected, make the brake fluid in the master cylinder flow out by safety vent 2b, thereby prevent generation residual voltage in the master cylinder.
But above-mentioned safety vent 2b makes first main piston 2, and reprocessing forms after main piston 2 is made relief port 2a, therefore exists cost to improve, add the defective that number increases.
And the diameter of above-mentioned safety vent 2b is little, if foreign matter is arranged in the brake fluid, is easily blocked by foreign matter, loses the function of eliminating residual voltage.
Summary of the invention
For addressing the above problem, the invention provides a kind of plunger typed master cylinder main piston, be when making main piston, to make simultaneously for the residual voltage cancellation element of eliminating the master cylinder residual voltage, with Cost reduction with add number.
And the present invention is above-mentioned residual voltage cancellation element from an end of above-mentioned main piston towards the other end, outer surface at above-mentioned main piston is recessed to form the yi word pattern groove, even there is foreign matter also can not be plugged in the brake fluid, thereby provide residual voltage to eliminate the plunger typed master cylinder main piston that function further promotes.
For addressing the above problem the technical solution adopted in the present invention be, can move by the strength of the thruster hydraulic pressure cavity along cylinder body, end towards the piston that flows forms the residual voltage cancellation element simultaneously, be used for eliminating and have the relief port of oil circuit effect and the residual voltage of master cylinder, and above-mentioned residual voltage cancellation element at an end of above-mentioned main piston towards the other end, being recessed to form the yi word pattern groove at the outer surface of above-mentioned main piston is feature.
Above-mentioned relief port is the hole of running through above-mentioned main piston inside and outside, form the hole of a plurality of intervals homogeneous along the circumferencial direction of main piston, and above-mentioned groove is between above-mentioned relief port.
Above-mentioned groove is the circumferencial direction along above-mentioned main piston, forms at least more than one.
One end of above-mentioned groove is that an end of above-mentioned main piston is open type, and the other end of above-mentioned groove is extended the position of running through above-mentioned relief port.
Above-mentioned groove is to form simultaneously when making above-mentioned main piston.
According to the present invention, for eliminating the residual voltage in the master cylinder, the groove that forms at input shaft is to form simultaneously when making above-mentioned input shaft and effective Cost reduction and add number, and above-mentioned groove is from an end of above-mentioned main piston towards the other end, outer surface at above-mentioned main piston is recessed to form yi word pattern, even foreign matter is arranged in the brake fluid, above-mentioned groove can not be plugged yet, thereby the residual voltage elimination function of above-mentioned input shaft is further got a promotion.
Description of drawings
Fig. 1 is the plunger typed master cylinder sectional view with input shaft of prior art;
Fig. 2 is the sectional view with plunger typed master cylinder of input shaft of the present invention;
Fig. 3 is the input shaft figure that has groove as the residual voltage cancellation element according to of the present invention;
Fig. 4 is the movement state diagram that has the plunger typed master cylinder of input shaft according to the present invention to Fig. 6.
Embodiment
The below describes additional exemplary plot in detail according to embodiments of the invention
The plunger typed master cylinder of vehicle according to the invention brake gear as shown in Figures 2 and 3, there is hydraulic pressure cavity 11a inside, and by the cylinder body 11 with the pouring orifice 11b that is connected with above-mentioned hydraulic pressure cavity 11a, the main piston 12 that moves along above-mentioned hydraulic pressure cavity 11a by the strength of thruster, the mobile piston 13 of borrowing the strength of above-mentioned main piston to move along above-mentioned hydraulic pressure cavity 11a, the a pair of Returnning spring 14 of elastic restoring force is provided to above-mentioned main piston 12 and mobile piston 13, in the cup groove 11c of above-mentioned cylinder body 11, form and consist of with seal cup 15 that the surface of above-mentioned main piston 12 and above-mentioned mobile piston 13 contacts respectively.
Here, above-mentioned main piston 12 has had the relief port 12a of oil circuit effect towards an end of above-mentioned mobile piston 12 and has been formed for eliminating the residual voltage cancellation element of master cylinder residual voltage.
Above-mentioned residual voltage cancellation element is characterised in that a end from above-mentioned main piston 12 towards the other end, is recessed to form yi word pattern groove 12b at above-mentioned main piston 12 outer surfaces.
Above-mentioned relief port 12a is the hole of running through above-mentioned main piston 12 inside and outsides, along the circumferencial direction of main piston 12 by uniformly-spaced forming porous, above-mentioned groove 12b is between above-mentioned relief port 12a, and the circumferencial direction along above-mentioned main piston 12 forms more than one at least simultaneously.
The end of above-mentioned groove 12b is to be opening shape to above-mentioned main piston 12 1 ends, and the other end of above-mentioned groove 12 is extended the position of running through above-mentioned relief port 12a.
And above-mentioned groove 12b when utilizing the above-mentioned main piston 12 of Mold Making, is processed to form in same mould simultaneously.
Fig. 4 or Fig. 6 are the diagrams of the course of action of plunger typed master cylinder.
Fig. 4 is that static (REST) state or pressure are disengaged the state diagram.
At first, above-mentioned state of rest is pouring orifice 11b and the interconnective state of relief port 12a, under above-mentioned state of rest, does not have the poor of pressure between the hydraulic pressure cavity 11a of oil conservator and cylinder body 11, thereby it is smooth and easy that brake fluid is flowed.
Under the above-mentioned state of rest, brake petal starts makes the steering force of brake petal be transmitted to main piston 12 by booster rocket, then above-mentioned main piston 12 as shown in Figure 5, the movement of advancing in the direction of arrows.
Under this state, be not only relief port 12a, groove 12b also sealed cup 15 blocks, and start required pressure and make hydraulic pressure cavity 11a produce break, and the state of this moment is called pressure generation state.
The break action is that the time point that above-mentioned groove 12b is blocked by above-mentioned seal cup 15 forms.
The pressure that above-mentioned pressure generation state puts on later on brake petal is eliminated, as shown in Figure 5, the direction power that mobile main piston 12 and mobile piston 12 borrowed Returnning spring 4 of advancing to the left, opposite direction towards Fig. 5 arrow namely retreats movement to the right again, revert to state as shown in Figure 4, the state of this moment is called the pressure relieving state.
Under the above-mentioned pressure relieving state, pouring orifice 11b and relief port 12a are connected again, and the brake fluid in the hydraulic pressure cavity 11a forms conventional operating state by relief port 12a and pouring orifice 11b outflow oil conservator thereupon.
On the other hand, the pressure that above-mentioned pressure generation state puts on later on brake petal is eliminated, and main piston 2 borrows the power of Returnning spring 4 to reset, but as shown in Figure 6, pouring orifice 11b and relief port 12a not necessarily are connected, and the state of this moment is called residual voltage generation state.
Above-mentioned residual voltage generation state is that size differs, when the reason such as tolerance build-up is disengaged braking, can't return to main piston 2 desired positions between the parts, causes 2a sealed cup 5 in relief port to block and occur.
As mentioned above, residual voltage generation state occuring, because of residual voltage residual in the master cylinder, braking is pressed can't generate smoothly and accident occurs in causing travelling.
For preventing these phenomenons, the present invention provides the structure of groove 12b as the residual voltage cancellation element in above-mentioned main piston 12.
In other words, even without returning to main piston 12 desired positions, the sealed cup of relief port 2a 5 is blocked, but main piston of the present invention 12 groove 12b can be with on pouring orifice 11b be connected, make the brake fluid in the master cylinder flow out pouring orifice 11b by groove 12b, thereby prevent from producing in the master cylinder residual voltage.
In other words, the state of Fig. 6 can be described as be used to the residual voltage elimination state that prevents that residual voltage from occuring.
Thereupon, advantage of the present invention is, the residual voltage cancellation element is that groove 12 is processed to form when making input shaft 12 simultaneously, need not utilize different process equipments to make separately a groove 12 and save cost and add number.
Residual voltage cancellation element of the present invention is groove 12 at an end of main piston 12 towards the other end in addition, even be recessed to form yi word pattern and brake fluid contains foreign matter and also can not be plugged at the outer surface of above-mentioned main piston 12, make the residual voltage of input shaft 12 of the present invention eliminate function and further get a promotion.
Claims (6)
1. plunger typed master cylinder main piston, it is characterized in that, utilize the power of the transmission of booster rocket to move along the hydraulic pressure cavity of cylinder body, comprise, on the described main piston towards an end of the piston that flows form from the circumferencial direction of described main piston run through the inside and outside, the relief port of oil circuit effect; And
One end of above-mentioned main piston is towards the other end, is recessed to form for the residual voltage cancellation element of eliminating the master cylinder residual voltage at the outer surface of described main piston.
2. plunger typed master cylinder main piston according to claim 1 is characterized in that, described relief port is the hole of running through described main piston inside and outside, by uniformly-spaced forming porous;
Described residual voltage cancellation element is exactly the groove between described relief port.
3. plunger typed master cylinder main piston according to claim 2 is characterized in that, described groove towards the other end, is recessed to form yi word pattern form at the outer surface of described main piston at an end of described main piston.
4. plunger typed master cylinder main piston according to claim 3 is characterized in that, described groove forms more than one at least along the circumferencial direction of described main piston.
5. according to claim 3 or 4 described plunger typed master cylinder main pistons, it is characterized in that, an end of described groove forms towards an end opening of described main piston; The other end of described groove then is extended the position of running through described relief port.
6. plunger typed master cylinder main piston according to claim 2 is characterized in that, described groove is to make in the mould of described main piston to form simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103113027A CN103047411A (en) | 2011-10-14 | 2011-10-14 | Plunger type master cylinder main piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103113027A CN103047411A (en) | 2011-10-14 | 2011-10-14 | Plunger type master cylinder main piston |
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| Publication Number | Publication Date |
|---|---|
| CN103047411A true CN103047411A (en) | 2013-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103113027A Pending CN103047411A (en) | 2011-10-14 | 2011-10-14 | Plunger type master cylinder main piston |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108350827A (en) * | 2015-11-17 | 2018-07-31 | 马自达汽车株式会社 | the piston structure of engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5525621A (en) * | 1978-08-11 | 1980-02-23 | Nissan Motor Co Ltd | Brake master cylinder |
| JP2762180B2 (en) * | 1991-08-20 | 1998-06-04 | 日信工業株式会社 | Poppet valve for master cylinder |
| KR20110072588A (en) * | 2009-12-23 | 2011-06-29 | 현대모비스 주식회사 | Pressure relief typed plunger master cylinder |
| CN202001531U (en) * | 2011-03-15 | 2011-10-05 | 温州市东启汽车零部件制造有限公司 | Plunger-type brake master cylinder |
-
2011
- 2011-10-14 CN CN2011103113027A patent/CN103047411A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5525621A (en) * | 1978-08-11 | 1980-02-23 | Nissan Motor Co Ltd | Brake master cylinder |
| JP2762180B2 (en) * | 1991-08-20 | 1998-06-04 | 日信工業株式会社 | Poppet valve for master cylinder |
| KR20110072588A (en) * | 2009-12-23 | 2011-06-29 | 현대모비스 주식회사 | Pressure relief typed plunger master cylinder |
| CN202001531U (en) * | 2011-03-15 | 2011-10-05 | 温州市东启汽车零部件制造有限公司 | Plunger-type brake master cylinder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108350827A (en) * | 2015-11-17 | 2018-07-31 | 马自达汽车株式会社 | the piston structure of engine |
| US10634247B2 (en) | 2015-11-17 | 2020-04-28 | Mazda Motor Corporation | Piston structure for engine |
| CN108350827B (en) * | 2015-11-17 | 2020-06-09 | 马自达汽车株式会社 | Piston structure of engine |
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Application publication date: 20130417 |
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