CN103786709A - Return pressure rise protective valve of emergency pump source oil tank in hydraulic braking system - Google Patents
Return pressure rise protective valve of emergency pump source oil tank in hydraulic braking system Download PDFInfo
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- CN103786709A CN103786709A CN201410035925.XA CN201410035925A CN103786709A CN 103786709 A CN103786709 A CN 103786709A CN 201410035925 A CN201410035925 A CN 201410035925A CN 103786709 A CN103786709 A CN 103786709A
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- spool
- valve
- shape circle
- hydraulic braking
- valve core
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Abstract
The invention belongs to the field of hydraulic technology and provides a return pressure rise protective valve of an emergency pump source oil tank in a hydraulic braking system. The return pressure rise protective valve aims at preventing the closed oil tank of an emergency pump source from being damaged by return pressure rise. The end face of a spool land is provided with a structure of an O-shaped ring. When the return pressure of the system is increased to a certain degree, the end face of the O-shaped ring of a valve element is attached to and pressed by the corresponding sealing end face of a valve body, so that an oil way is cut off and sealed in the axial direction without seepage. Through the structure of a gland ring for a hole of the valve element, the oil way is cut off and the valve element is radially sealed without seepage, so that after the return pressure is increased, the oil tank is completely disconnected with return oil, and the oil tank is protected against influence by return pressure rise. The return pressure rise protective valve of the emergency pump source oil tank in the hydraulic braking system is compact in structure, reliable in work, simple and practical.
Description
Technical field
This patent belongs to hydraulic technique field, is specifically related to the emergent pumping source tank drainback voltage rise protective valve of a kind of hydraulic brake system, avoids the sealed reservoir of emergent pumping source to damage because spill pressure raises.
Background technology
Automobile hydraulic system is the same with general hydraulic efficiency pressure system, conventionally by fuel tank, oil pump, valve, the compositions such as pipeline, but due to space constraint, often claimed structure compactness, some for subsequent use or emergent oil sources often can only use sealed reservoir, and sealed reservoir will taking into account system spill pressure problem, once spill pressure exceeds the bearing capacity of sealed reservoir, will cause fuel tank to damage, the system failure, for example some special vehicle hydraulic braking brake system fuel feeding are from driving device assembly, and in the time that driving device assembly lifts, need to be by the confession of hydraulic braking system, oil return supplies by quick coupling (automatic-sealed after disconnecting) and the braking of driving device assembly, oil return disconnects.After disconnection, on other cars of hydraulic brake system, part has just formed a closed system, but hydraulic braking system also comprises brake accumulator, contain brake-pressure oil, the pressure oil of energy storage can progress into oil return line by the gap of system valve (brake activation valve adopts guiding valve conventionally), causes spill pressure to raise, as system now contains for subsequent use or emergent pumping source of braking, and its sealed reservoir is directly connected with system oil return, will cause fuel tank to damage because spill pressure is too high.
Therefore, need to design the emergent pumping source tank drainback-voltage rise protective valve of a kind of hydraulic braking, make the sealed reservoir of jury pump can be not impaired because of the rising of system oil return pressure.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is to provide the emergent pumping source tank drainback voltage rise protective valve of a kind of hydraulic brake system, is applied in spill pressure rising and can causes brokenly on the sealed reservoir encircling.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides the emergent pumping source tank drainback voltage rise protective valve of a kind of hydraulic braking, comprise O shape circle, nut, cover plate, left spool, O shape circle trim ring, valve body, spool, back-up ring, flange, screw, spring and pressure regulation bung flange, described back-up ring interference is arranged on spool, the interference of O shape circle trim ring is arranged on left spool, and left spool flush fit is arranged on spool; Nut is screwed on spool by screw thread, fixing spacing to left spool; It is characterized in that: this protective valve also comprises that O shape circle and hole lattice enclose the assembling before left spool is installed of described O shape circle; 2 holes are enclosed before back-up ring and nut assembling and are installed with lattice; Cover plate, flange are arranged on valve body by screw; Pressure regulation bung flange is screwed onto on flange, and spacing by screw.
Wherein, described nut, Ge Laiquan for hole, left spool, O shape circle trim ring, O shape circle, spool and back-up ring form the combination valve core of described protective valve.
Wherein, the equal diameters on described combination valve core oil groove both sides or the diameter of oil inlet end are greater than the diameter of feedback end, and the static force that combination valve core is subject to is F static state=P feedback × S feedback end face-F spring-F friction force.
Wherein, spill pressure is applied to the left end of combination valve core by the feedback hole of described spool; in the time that the thrust of spill pressure rising formation is greater than the pre-pressure of the spring on combination valve core right side and the force of sliding friction of combination valve core self; oil return promotes spool and moves right; spill pressure is elevated to after setting value, the corresponding end face laminating of the right side of left spool and valve body, simultaneously the O shape circle on combination valve core also with the corresponding end face combination of valve body; form side seal, and protective valve is forming after side seal.
(3) beneficial effect
Compared with prior art, the present invention possesses following beneficial effect:
1, the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking provided by the invention, by the structure of spool land end face band O shape circle, when system oil return pressure is elevated to after certain pressure, the O shape circle end face seal face laminating corresponding to valve body of spool compresses, realize the ne-leakage side seal that oil circuit cuts off, carry out coil structures by the hole of spool with lattice and realized the no-leakage valve core radial seal that oil circuit cuts off, work as the completely disconnected of spill pressure rising rear fuel tank and oil return thereby realize, protection fuel tank is not raise by spill pressure to be affected;
2, compact conformation of the present invention, reliable operation, simple and practical.
Accompanying drawing explanation
Fig. 1 is the structural representation of the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking provided by the invention;
Fig. 2 is the birds-eye view of Fig. 1;
Fig. 3 is the hydraulic applications schematic diagram of the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking provided by the invention;
Fig. 4 is the schematic diagram after spool action in the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking provided by the invention;
Fig. 5 is the assembling enlarged diagram of spool in the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking provided by the invention.
The specific embodiment
For making object of the present invention, content and advantage clearer, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Oil return protective valve of the present invention is as a part for the emergent pumping source of vehicle brake hydraulic system, and oil inlet is connected with total oil return of vehicle brake hydraulic system, and oil outlet is connected with the fuel tank of emergent pumping source.
As shown in Fig. 1,2,3,4 and 5, the hydraulic braking provided by the invention pumping source tank drainback voltage rise protective valve of meeting an urgent need, comprise O shape circle 1, nut 2, cover plate 3, left spool 5, O shape circle trim ring 6, valve body 8, spool 9, back-up ring 10, flange 11, screw 12, spring 13 and pressure regulation bung flange 14, described back-up ring 10 interference are arranged on spool 9,6 interference of O shape circle trim ring are arranged on left spool 5, and left spool 5 flush fits are arranged on spool 9; Nut 2 is screwed on spool 9 by screw thread, fixing spacing to left spool 5; This protective valve also comprises that O shape circle 7 and hole lattice enclose 4, the assembling before left spool 5 is installed of described O shape circle 7; 2 holes are enclosed 4 with lattice and are installed before back-up ring 10 and nut 2 assemblings; Cover plate 3, flange 11 are arranged on valve body 8 by screw 12; Pressure regulation bung flange 14 is screwed onto on flange 11, and locates by screw 15.1 pair of valve body 8 of O shape circle seals; Cover plate 3 is spacing to combination valve core; Valve body 8 provides location and the support of oil duct and other parts of valve; Spacing, positioning supports effect that flange 11 plays; 12 fixations of screw; Spring 13 is to emergent pumping source tank drainback pressure limiting, combination valve core return; Pressure regulation bung flange 14 is realized emergent oil sources tank drainback pressure limiting and is adjusted.
Wherein, lattice enclose 4, left spool 5, O shape circle trim ring 6, O shape circle 7, spool 9 and back-up ring 10 form described protective valve combination valve core for described nut 2, hole.Nut 2 encloses 4 spacing to left spool 5, hole with lattice; 4 pairs of spool radial clearance seals are enclosed with lattice in hole, reduce the friction drag of spool, reduce the minimum voltage limiting value of protective valve; The diameter that left spool 5 makes combination valve core cross two ends, oil groove left and right meets design requirement; O shape circle trim ring 6 guarantees can not come off after 7 assemblings of O shape circle; 7 pairs of spools of O shape circle carry out side seal; Spool 9 forms combination valve core realizes the break-make of oil circuit; Enclose 4 assembling with lattice for the ease of small hole size, combination valve core is by increasing back-up ring 10, and the version of nut 2 is simplified the assembling that small hole size is enclosed with lattice.
Wherein, the equal diameters on described combination valve core oil groove both sides or the diameter of oil inlet end are greater than the diameter of feedback end, and the static force that combination valve core is subject to is F static state=P feedback × S feedback end face-F spring-F friction force.
Working process:
Spill pressure is applied to the left end of combination valve core by the feedback hole of described spool 9, in the time that the thrust of spill pressure rising formation is greater than spring 13 precompressed compressions on combination valve core right side and the force of sliding friction of combination valve core self, oil return promotes spool 9 and moves right, spill pressure is elevated to after setting value, fit with the corresponding end face of valve body 8 in the right side of left spool 5, simultaneously the circle of the O shape on combination valve core 7 also with the corresponding end face combination of valve body 8, form side seal, and protective valve is forming after side seal, the effective active area that the corresponding combination valve core of valve oil-feed is crossed the left step end face of oil groove reduces, right step end face active area is constant, make combination valve core increase an application force to the right, make poppet shaft sealing more reliable, the side seal combined hole of ne-leakage encloses 4 structures with lattice and realizes no-leakage valve core radial seal, thereby realizes the disconnection completely when spill pressure rising rear fuel tank and oil return, and protection fuel tank is not raise by spill pressure to be affected.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (4)
1. the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking, comprise O shape circle (1), nut (2), cover plate (3), left spool (5), O shape circle trim ring (6), valve body (8), spool (9), back-up ring (10), flange (11),, spring (13) and pressure regulation bung flange (14), described back-up ring (10) interference is arranged on spool (9), it is upper that the interference of O shape circle trim ring (6) is arranged on left spool (5), and left spool (5) flush fit is arranged on spool (9); It is upper that nut (2) is screwed in spool (9) by screw thread, fixing spacing to left spool (5); It is characterized in that: this protective valve also comprises that O shape circle (7) and hole lattice enclose (4), and described O shape circle (7) is assembling before left spool (5) is installed; 2 holes are enclosed (4) with lattice and are installed before back-up ring (10) and nut (2) assembling; Cover plate (3), flange (11) are arranged on valve body (8) by screw (12); It is upper that pressure regulation bung flange (14) is screwed onto flange (11), and by screw (15) location.
2. the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking according to claim 1, is characterized in that: described nut (2), hole lattice enclose (4), left spool (5), O shape circle trim ring (6), O shape circle (7), spool (9) and back-up ring (10) and form the combination valve core of described protective valve.
3. the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking according to claim 2; it is characterized in that: the equal diameters on described combination valve core oil groove both sides or the diameter of oil inlet end are greater than the diameter of feedback end, the static force that combination valve core is subject to is F static state=P feedback × S feedback end face-F spring-F friction force.
4. the emergent pumping source tank drainback voltage rise protective valve of hydraulic braking according to claim 1, it is characterized in that: spill pressure is applied to the left end of combination valve core by the feedback hole of described spool (9), in the time that the thrust of spill pressure rising formation is greater than spring (13) precompressed compression on combination valve core right side and the force of sliding friction of combination valve core self, oil return promotes spool (9) and moves right, spill pressure is elevated to after setting value, fit with the corresponding end face of valve body (8) in the right side of left spool (5), simultaneously the circle of the O shape on combination valve core (7) also with the corresponding end face combination of valve body (8), form side seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035925.XA CN103786709B (en) | 2014-01-24 | 2014-01-24 | A kind of hydraulic brake system is met an urgent need pumping source tank drainback voltage rise protective valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035925.XA CN103786709B (en) | 2014-01-24 | 2014-01-24 | A kind of hydraulic brake system is met an urgent need pumping source tank drainback voltage rise protective valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103786709A true CN103786709A (en) | 2014-05-14 |
| CN103786709B CN103786709B (en) | 2016-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410035925.XA Active CN103786709B (en) | 2014-01-24 | 2014-01-24 | A kind of hydraulic brake system is met an urgent need pumping source tank drainback voltage rise protective valve |
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| CN (1) | CN103786709B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0157371B1 (en) * | 1996-05-31 | 1998-10-15 | 김무 | Parking brake protection device of heavy equipment |
| JP2000046218A (en) * | 1998-07-31 | 2000-02-18 | Shin Caterpillar Mitsubishi Ltd | Pressure control valve |
| CN201236854Y (en) * | 2008-05-19 | 2009-05-13 | 长治液压有限公司 | Control valve of hydraulic hammer |
| AU2009100917A4 (en) * | 2009-09-11 | 2009-10-22 | Johannes Nijhuis | TSVB (Tipper Body Hose Break Prevention System) |
| CN201786816U (en) * | 2010-09-03 | 2011-04-06 | 三一重工股份有限公司 | Protector for preventing over high oil return pressure of system casing |
| CN202011388U (en) * | 2010-12-30 | 2011-10-19 | 北京安期生技术有限公司 | Hydraulic auxiliary release type brake system |
-
2014
- 2014-01-24 CN CN201410035925.XA patent/CN103786709B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0157371B1 (en) * | 1996-05-31 | 1998-10-15 | 김무 | Parking brake protection device of heavy equipment |
| JP2000046218A (en) * | 1998-07-31 | 2000-02-18 | Shin Caterpillar Mitsubishi Ltd | Pressure control valve |
| CN201236854Y (en) * | 2008-05-19 | 2009-05-13 | 长治液压有限公司 | Control valve of hydraulic hammer |
| AU2009100917A4 (en) * | 2009-09-11 | 2009-10-22 | Johannes Nijhuis | TSVB (Tipper Body Hose Break Prevention System) |
| CN201786816U (en) * | 2010-09-03 | 2011-04-06 | 三一重工股份有限公司 | Protector for preventing over high oil return pressure of system casing |
| CN202011388U (en) * | 2010-12-30 | 2011-10-19 | 北京安期生技术有限公司 | Hydraulic auxiliary release type brake system |
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| Publication number | Publication date |
|---|---|
| CN103786709B (en) | 2016-03-16 |
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