CN1757552A - Equal difference relay valve - Google Patents
Equal difference relay valve Download PDFInfo
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- CN1757552A CN1757552A CN 200510086875 CN200510086875A CN1757552A CN 1757552 A CN1757552 A CN 1757552A CN 200510086875 CN200510086875 CN 200510086875 CN 200510086875 A CN200510086875 A CN 200510086875A CN 1757552 A CN1757552 A CN 1757552A
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- 230000000694 effects Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 description 22
- 230000006835 compression Effects 0.000 description 21
- 238000010586 diagram Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 2
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- 208000002925 dental caries Diseases 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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Abstract
An equi-different relay valve for the barking system features that in its valve body, there are a control air cavity with small piston, a high-pressure air cavity with valve core, and an equi-different air cavity with big piston and positioned between the first two. Said small and big pistons are nested. Its air pressure for braking is greater than its input pressure by a constant value. Its advantage is high effect to simplify structure, improve stability and decrease noise.
Description
Technical field
The present invention relates to the relay valve in the brake system of car, particularly a kind of equal difference relay valve, described equal difference is meant that the pressure reduction between the control gas of the braking gas of output and input can dynamically maintain a steady state value.
Background technology
Automobile brake system is made up of parts such as master cylinder, the interlock of five valves (air switching valve, relay valve, twin-stage valve, electromagnetic valve and pressure regulating valve), air chamber, brake facing, brake drum and pipeline, air receivers.Wherein relay valve and twin-stage valve are replaced by the twin-stage relay valve, change the interlock of four valves into.But existing four valves interlock still exists, and complex structure, stability are poor, maintenance difficult, air consumption is big, cost is high, reaction waits many disadvantages slowly.Existing automobile brake system principle keeps certain air pressure P1 as shown in Figure 1 during air chamber compression chamber normality, air pressure and spring force keep balance.Glancing impact, braking gas charges into the spring cavity of air chamber, promotes piston and implements braking.Piston extruding compression chamber, compression chamber gas part exhaust to atmosphere, when air pressure was reduced to the P2. end of braking, spring cavity braking gas exhaust to atmosphere to the compression chamber tonifying Qi, returned to P1 air pressure by the twin-stage relay valve, the air chamber normality that restores balance.Gas in the above-mentioned compression chamber is put into atmosphere at each glancing impact, and make-up gas again after the end of braking causes the very big waste of gas.In order to reduce gas consumption, one air receiver is set to be communicated with compression chamber, the air receiver normal pressure is P1, glancing impact, because the gas of compression chamber exhaust to atmosphere no longer, but part is squeezed into air receiver, so the air pressure in the compression chamber is not P2, but exceed the P1-P2 value, and add the P that increases owing to volume-diminished, the compression chamber actual pressure has increased a constant P1-P2+P.In order to reach the purpose that is braked, the braking gas that charges into the spring cavity of air chamber also must increase a constant P1-P2+P, that is to say, braking gas increases a constant P1-P2+P than the braking gas air pressure of control gas output.Mostly existing relay is to solve the long problem of braking time, and its braking gas equates with the air pressure of control gas, can't satisfy the demand.
Summary of the invention
At the demand, the invention provides a kind of equal difference relay valve, the braking gas air pressure of its output is all the time than the high fixed value of importing of control gas air pressure.
Technical solution of the present invention is as follows:
Equal difference relay valve, it is characterized in that: comprise control air cavity that has valve piston that is provided with in the valve body and the high pressure air cavity that has spool, and between the equal difference air cavity that has big piston between the two, described valve piston is nested the connection with big piston, described high pressure air cavity is connected by switching spool with the equal difference air cavity, and the plasmas channel of described equal difference air cavity and described spool is connected by the end switches of described valve piston.
Described valve piston is provided with pull back spring back between the one side of controlling air cavity and valve body, this pull back spring makes the plasmas channel of described equal difference air cavity and described spool keep normally open.
Described big piston is provided with holddown spring back between the one side of equal difference air cavity and valve body.
Be provided with the return little spring between described spool and valve body, this little spring makes described high pressure air cavity and equal difference air cavity keep normal off status.
Described valve piston with nested connection of big piston be meant that valve piston is inserted in its bar portion in the cooresponding hole of big piston, and be provided with shoulder in the bar portion of valve piston.
Described switch connects employing O-ring seal structure.
Technique effect of the present invention is as follows:
Because equal difference relay valve of the present invention, be provided with three air cavitys: control air cavity, equal difference air cavity and high pressure air cavity, and by the nested bonded assembly of double-piston to pushing away effect, and the switch gearing of high pressure air cavity and equal difference air cavity, equal difference air cavity and spool plasmas channel, make the air pressure of equal difference air cavity can constantly be higher than the air pressure of controlling air cavity, that is to say, when the equal difference air cavity connects compressed air brake cylinder, by the braking gas air pressure of this equal difference air cavity output all the time than the high fixed value of control gas air pressure of input.
As follows about effect and the comparative illustration purposes of prior art of the present invention in automobile brake system:
Keep air pressure 5kg/cm during air chamber compression chamber normality
2, this pressure and spring force keep balance.Glancing impact, braking gas charges into the spring cavity of air chamber, promotes piston and implements braking.Piston extruding compression chamber, compression chamber gas part exhaust to atmosphere, air pressure is reduced to 3.5kg/cm
2During end of braking, spring cavity braking gas exhaust to atmosphere to the compression chamber tonifying Qi, returns to 5kg/cm by the twin-stage relay valve
2Air pressure, the air chamber normality that restores balance.In order to reduce gas consumption, the air receiver of establishing one 20 liters is communicated with compression chamber, air receiver normal pressure 5kg/cm
2Glancing impact, because the gas of compression chamber exhaust to atmosphere no longer, but part is squeezed into air receiver, so no longer be 3.5kg/cm
2, but 5kg/cm
2, exceed 1.5kg/cm than originally
2, to add and be extruded the 0.3kg that volume-diminished increases, the compression chamber actual pressure has increased a fixed value 1.8kg/cm
2In order to reach the purpose of braking, the braking gas that charges into the air chamber spring cavity also must increase a constant 1.8kg/cm
2, that is to say that braking gas increases a constant 1.8kg/cm than control gas
2This task is finished by equal difference relay valve.The function of equal difference relay valve be exactly output braking gas air pressure all the time than the input the high fixed value of control gas air pressure.That is: braking gas air pressure-control gas air pressure=fixed value.
Equal difference relay valve can replace twin-stage relay valve, electromagnetic valve, pressure regulating valve and air switching valve four valves simultaneously, has simplified mechanism widely, has improved stability, maintains easily, and improves response speed, has reduced gas consumption simultaneously, has reduced cost, and has had noise reduction sound function.The invention of equal difference relay valve is a brake field revolution truly, reaches the quite high boundary of brake field.
Description of drawings
Fig. 1: existing brake system schematic diagram.
Fig. 2: use brake system schematic diagram of the present invention.
Fig. 3: the structural principle scheme drawing of equal difference relay valve.
Each label lists as follows among the figure:
The 1-relief port, 1 '-relief port, 2-spring cavity, the 3-compression chamber, 4-piston rod, 5-pull back spring, 5 '-pull back spring, 6-spool, 7-big piston, the 8-holddown spring, 9-valve piston, 10-loam cake, the 11-valve body, 12-bottom flange, the last positioning boss of 13-, positioning boss under the 14-, 15-spool mouth is the f mouth, the 16-gap, the 17-connected entrance is the e mouth, and 21-control gas port is the K inlet, and 22-high pressure gas inlet is the P inlet, the 23-relief port, the outlet of 24-braking gas is the A outlet, and 31-control air cavity is a chamber, and 32-equal difference air cavity is the c chamber, d-braking gas passage, b-high pressure air cavity.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is existing brake system schematic diagram.Glancing impact, braking gas charges into spring cavity 2, promote piston rod 4 and implement braking, push compression chamber 3 simultaneously, portion gas in the compression chamber is by relief port 1 ' exhaust to atmosphere, and after the end of braking, the gas in the spring cavity 2 is by relief port 1 exhaust to atmosphere, go in the compression chamber 3 by replenishing the gas tonifying Qi, make the air chamber normality that restores balance.
Fig. 2 is the brake system schematic diagram after improving.Control gas is through behind the equal difference relay valve, and gas is braked in output, and braking pressure is greater than steady state value of control air pressure, compression chamber 3 is communicated with air receiver, and glancing impact, compressed gas are to enter in the air receiver, after the end of braking, the gas in the compression chamber is replenished by air receiver, has reduced gas consumption.
Fig. 3 looks cutaway view for the equal difference relay valve master.Equal difference relay valve of the present invention, the loam cake 10 that comprises a band control gas port 21, valve body 11 and one has the bottom flange 12 of high pressure gas inlet 22, the outlet 24 of braking gas and relief port 23, one big piston 7 and the valve piston 9 embedded composite pistons that combine are arranged in the valve body 11, and valve piston 9 is preferably T type structure.Big piston 7 and sliding block joint are with it passed in the lower end of valve piston 9, valve piston 9 upper ends and loam cake 10 form control air cavity 31 (being a chamber), be provided with the spool 6 that is communicated with relief port 23 in the bottom flange 12, glancing impact, spool mouth 15 (being the f mouth) can be sealed in the lower end of valve piston 9.Composite piston and bottom flange 12 form equal difference air cavity 32 (being the c chamber), and equal difference air cavity 32 is communicated with braking gas outlet 24.Be fixedly connected with device for exerting on the composite piston.The used device for exerting of the present invention is a holddown spring 8, holddown spring 8 is connected between positioning boss 11 and the big piston 7, big piston 7 is shelved on down on the positioning boss 14, and the following positioning boss 14 of setting of the present invention is the projection that bottom flange buckles into valve body, can also be other form.Leave gap 16 between bottom flange 12 and the spool 6, gap 16 is communicated with equal difference air cavity 32 by the connected entrance 17 (being the e mouth) that is provided with high pressure gas inlet 22.9 of last positioning boss 13 and valve pistons are connected with pull back spring 5 ', also are provided with pull back spring 5 between valve core case 18 that is provided with in the relief port 23 and the spool 6, and when control gas was cancelled, valve piston 9 and spool 6 can reset rapidly, increase the sensitivity of equal difference relay valve.
The principle of work of equal difference relay valve of the present invention: high pressure gas P enters from high pressure gas inlet 22, owing to also be provided with pull back spring 5 between valve core case 18 and the spool 6, add gas pressure on spool 6, connected entrance e closes, and pressure gas P can't enter equal difference air cavity 32 (being the c chamber); When control air cavity 31 (being a chamber) control of access pressure gas K, promoting valve piston 9 moves down, continue to move down behind the sealing spool mouth f, promote spool 6, open connected entrance e, high pressure gas enter equal difference air cavity 32 (being the c chamber), and process is braked gas passage d or the d chamber enters epitrochoidal chamber A, the pressure gas that enters the c chamber produces thrust to big piston 7, big piston is moved up and drive on the valve piston 9 and move, close until valve port e or connected entrance e, this moment, the high pressure air cavity was that the gas in b chamber no longer enters the c chamber, and it is constant that c keeps in the chamber air pressure Pc; At this moment, big piston 7 and valve piston 9 can be regarded a piston body as, it is subjected to the product of downward power Pa and valve piston 9 areas and the power of holddown spring 8, power upwards is the MAD pull back spring 5 ' of big piston 7 lower annular areas and Pc and making a concerted effort of pull back spring 5 and b chamber atmospheric pressure, through rational design calculation, Pc-Pa=C (C is a steady state value) can be obtained,, the different C value that we require can be obtained by design holddown spring 8; Bleed off the gas of control air cavity 31 (being a chamber), because the equilibrium relation of piston body is destroyed, piston body moves up, f opens with the spool mouth, equal difference air cavity 32 (being the c chamber) gas is discharged from relief port, big piston 7 breaks away from and return with valve piston 9 under the effect of holddown spring 8, while valve piston return under the effect of pull back spring 5, and all recover virgin state.
Claims (6)
1. equal difference relay valve, it is characterized in that: comprise control air cavity that has valve piston that is provided with in the valve body and the high pressure air cavity that has spool, and between the equal difference air cavity that has big piston between the two, described valve piston is nested the connection with big piston, described high pressure air cavity is connected by switching spool with the equal difference air cavity, and the plasmas channel of described equal difference air cavity and described spool is connected by the end switches of described valve piston.
2. equal difference relay valve according to claim 1 is characterized in that: described valve piston is provided with pull back spring back between the one side of controlling air cavity and valve body, and this pull back spring makes the plasmas channel of described equal difference air cavity and described spool keep normally open.
3. equal difference relay valve according to claim 1 is characterized in that: described big piston is provided with holddown spring back between the one side of equal difference air cavity and valve body.
4. equal difference relay valve according to claim 1 is characterized in that: be provided with the return little spring between described spool and valve body, this little spring makes described high pressure air cavity and equal difference air cavity keep normal off status.
5. equal difference relay valve according to claim 1 is characterized in that: described valve piston with nested connection of big piston be meant that valve piston is inserted in its bar portion in the cooresponding hole of big piston, and be provided with shoulder in the bar portion of valve piston.
6. equal difference relay valve according to claim 1 is characterized in that: described switch connects employing O-ring seal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100868759A CN100411925C (en) | 2005-11-14 | 2005-11-14 | Equal difference relay valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100868759A CN100411925C (en) | 2005-11-14 | 2005-11-14 | Equal difference relay valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1757552A true CN1757552A (en) | 2006-04-12 |
| CN100411925C CN100411925C (en) | 2008-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100868759A Expired - Fee Related CN100411925C (en) | 2005-11-14 | 2005-11-14 | Equal difference relay valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100411925C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101716928B (en) * | 2009-11-16 | 2011-06-08 | 浙江万安科技股份有限公司 | Emergency control valve assembly |
| CN112431678A (en) * | 2020-12-31 | 2021-03-02 | 潍柴动力扬州柴油机有限责任公司 | Constant pressure exhaust brake pressure limiting valve |
| WO2024077699A1 (en) * | 2022-10-10 | 2024-04-18 | 浙江万安科技股份有限公司 | Parking relay valve and parking braking system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2027173A (en) * | 1978-08-01 | 1980-02-13 | Girling Midland Ross Air Act | Fluid-pressure-operated relay valves |
| US4225193A (en) * | 1979-05-01 | 1980-09-30 | American Standard Inc. | Control valve arrangement for combined brake cylinder and reservoir |
| US4438980A (en) * | 1981-03-27 | 1984-03-27 | Bendix Limited | Proportioning valve with pressure port communicating with stepped area of differential piston |
| JPH01153372A (en) * | 1987-12-10 | 1989-06-15 | Nippon Air Brake Co Ltd | Change-over valve |
| CN2191143Y (en) * | 1993-12-12 | 1995-03-08 | 陈仲明 | Synchronous emergent relay valve |
| US5666995A (en) * | 1996-05-21 | 1997-09-16 | Alliedsignal Truck Brake Systems Co. | Pilot relay valve including means to control flow through a balance orifice |
| ITTO20010600A1 (en) * | 2001-06-21 | 2002-12-21 | Knorr Bremse Systeme | VALVE UNIT, IN PARTICULAR FOR THE USE IN THE PNEUMATIC BRAKING SYSTEM OF A DRIVE, TO CONTROL THE BRAKING OF A |
| CN2851041Y (en) * | 2005-11-14 | 2006-12-27 | 王庭义 | Equidifferent relay valve |
-
2005
- 2005-11-14 CN CNB2005100868759A patent/CN100411925C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101716928B (en) * | 2009-11-16 | 2011-06-08 | 浙江万安科技股份有限公司 | Emergency control valve assembly |
| CN112431678A (en) * | 2020-12-31 | 2021-03-02 | 潍柴动力扬州柴油机有限责任公司 | Constant pressure exhaust brake pressure limiting valve |
| WO2024077699A1 (en) * | 2022-10-10 | 2024-04-18 | 浙江万安科技股份有限公司 | Parking relay valve and parking braking system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100411925C (en) | 2008-08-20 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: BEIJING TINGYI BRAKE CO., LTD. Free format text: FORMER OWNER: WANG TINGYI Effective date: 20100115 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100115 Address after: Building M2-5, No. 3, District, Beijing Economic Development Zone, Pinggu Patentee after: Beijing Tingyi Brake Co., Ltd. Address before: No. 5, unit 3, Paradise West District, Pinggu District, Beijing Patentee before: Wang Tingyi |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing Tingyi Brake Co., Ltd. Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing Tingyi Brake Co., Ltd. Document name: Notification of Termination of Patent Right |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080820 Termination date: 20141114 |
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| EXPY | Termination of patent right or utility model |