CN204383560U - Hydraulic steering gear unloader valve - Google Patents
Hydraulic steering gear unloader valve Download PDFInfo
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- CN204383560U CN204383560U CN201420803300.9U CN201420803300U CN204383560U CN 204383560 U CN204383560 U CN 204383560U CN 201420803300 U CN201420803300 U CN 201420803300U CN 204383560 U CN204383560 U CN 204383560U
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- valve seat
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- spring
- core housing
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Abstract
Hydraulic steering gear unloader valve, belongs to fluid pressure actuator, comprises valve seat, level pressure spring, guide valve seat, spring perch, steel ball, spool, main spool spring and valve core housing; Described guide valve seat offer all with regulate the little oil circuit oil outlet that is connected of chamber and regulate chamber fuel feed hole; Described level pressure spring one end contacts valve seat, and the other end contacts spring perch; Described steel ball and guide valve seat inwall touch thus close and regulate chamber fuel feed hole; Described main spool spring is arranged at valve core inside, and one end contacts guide valve seat, and the other end contacts spool inwall; Described valve core housing is located at valve core housing inside, and with valve core housing bearing fit; Described spool offers damping hole; Described valve core housing offers large oil circuit oil outlet and main oil inlet.Hydraulic steering gear unloader valve is relative to traditional unloader valve, and because steel ball and level pressure spring are standardized component, spring perch is also easy to processing, because this reducing the productive costs of unloader valve.
Description
Technical field
The utility model belongs to fluid pressure actuator, is particularly related to hydraulic steering gear unloader valve.
Background technology
When motor turning bridge axle loaden mass is greater than 4000kg, power steering apparatus must be adopted.When power steering apparatus lost efficacy, self-propelled vehicle realized turning to by the unloader valve on steering box, made bearing circle still can controlling machine motor-car.
The effect of unloader valve is that the pressure of hydraulic control steering swivel system no longer raises, and such as ZLD7276 series deflector pressure unloading is 16.5MPa.And product in the market due to through-current capability limited, after system unloaded, pressure durations raises, and ranges up to 19MPa.Due to hypertonia, make steering pump and hydraulic steering gear there is certain hidden danger of quality, concrete failure mode shows as: degradation under steering pump explosion, deflector explosion, hydraulic part durability.Therefore, be necessary to rectify and improve this hidden danger of quality.
Fig. 1 is the steel ball and spring direct dynamic structure schematic diagram of traditional unloader valve, its structure is simple, easy to process, but due to through-current capability limited, large discharge open and shut characteristic is poor, can not the pressure unloading of effective stabilization system, cause steering pump and hydraulic steering gear to there is certain hidden danger of quality.
Fig. 2 is the structural representation of the unloader valve of German import, and it comprises guide's valve seat A, thimble B, pilot valve C, locating bush D, seal ring E, main valve plug F, stage clip G and main valve core retainer plate H.During work; unloader valve entrance is connected with high-pressure working chamber; unloader valve outlet is connected with oil sump tank; when epitrochoidal chamber pressure exceedes certain value, pilot valve C moves right and opens, and section hydraulic oil flows out from the oil outlet guide's valve seat A; thus main valve plug F inside and outside generation difference of pressure is moved to the left opens; unloader valve entrance and outlet, partial high pressure oil is directly back to oil sump tank, plays a protective role to hydraulic efficiency pressure system.The unloader valve small volume of this structure, to the material of thimble B, pilot valve C and locating bush D and requirement on machining accuracy high, component processing difficulty is high, and processing technology is complicated, which increases the productive costs of this unloader valve.Because our national working ability is weak, market requires higher, so the product that technique is simple, cost performance is high more can meet the demand of user to cost control.
Utility model content
The purpose of this utility model is to overcome the above-mentioned defect mentioned and deficiency, and provides hydraulic steering gear unloader valve
The technical scheme that the utility model realizes the employing of its object is as follows.
Hydraulic steering gear unloader valve, comprises valve seat, level pressure spring, guide valve seat, spring perch, steel ball, spool, main spool spring and valve core housing; Described guide valve seat inside offers the adjustment chamber of accommodating level pressure spring, spring perch and a steel ball, and guide valve seat offers the little oil circuit oil outlet that is all connected with adjustment chamber and regulates chamber fuel feed hole; Described level pressure spring one end contacts valve seat, and the other end contacts spring perch; Described steel ball is arranged in the groove on spring perch; Described steel ball and guide valve seat inwall touch thus close and regulate chamber fuel feed hole; Described main spool spring is arranged at valve core inside, and one end contacts guide valve seat, and the other end contacts spool inwall; Described valve core housing is located at valve core housing inside, and with valve core housing bearing fit; Described spool offers damping hole; Described valve core housing offers large oil circuit oil outlet and main oil inlet.
Described valve seat and guide valve seat are threaded, and are arranged with O shape circle outside described valve seat.
Described guide valve seat and valve core housing interference fit; Valve core housing left end is provided with thin-wall sleeve, and the thickness of thin-wall sleeve is less than the thickness of valve core housing body; Thin-wall sleeve is sheathed on guide valve seat outside, and with guide valve seat interference fit.
The adjustment chamber of guide valve seat from left to right comprises the first cylindrical cavity, the second cylindrical cavity, the first round platform chamber, three cylindrical chamber and the second round platform chamber; The internal diameter of described second cylindrical cavity is greater than the internal diameter of the first cylindrical cavity and the external diameter of spring perch simultaneously, and described little oil circuit oil outlet is communicated with the second cylindrical cavity; Going to the bottom of first round platform chamber is connected with the second cylindrical cavity, and upper base is connected with three cylindrical chamber; The diameter of going to the bottom in the first round platform chamber is greater than the diameter of steel ball, and upper base diameter is less than the diameter of steel ball; Steel ball touches the circumference of the first round platform chamber upper base, thus closes the passage in the first round platform chamber and three cylindrical chamber; Going to the bottom of described second round platform chamber is connected with three cylindrical chamber, and upper base is connected with adjustment chamber fuel feed hole.
Described spring perch comprises the cylinder and ear that are wholely set; Ear is fixedly arranged on cylindrical end face; Described cylinder is inserted in level pressure spring inner; Described level pressure spring contacts in ear.
This hydraulic steering gear unloader valve is relative to traditional unloader valve, pilot valve, level pressure spring is replaced to replace thimble, spring perch to replace locating bush with steel ball, because steel ball and level pressure spring are standardized component, spring perch is also easy to processing, because this reducing the productive costs of unloader valve, meanwhile, the reasonable in design between this unloader valve all parts, there is good through-flow property, add the working stability of unloader valve.
Accompanying drawing explanation
Fig. 1 is the structural representation of steel ball and spring Direct Action Type unloader valve;
Fig. 2 is the structural representation of German import unloader valve;
Fig. 3 is structural representation of the present utility model;
Fig. 4 is the structural representation of the utility model guide valve seat;
Fig. 5 is the pressure flow diagram of curves of the utility model and traditional product;
In figure: A-guide's valve seat, B-thimble, C-pilot valve, D-locating bush, E-seal ring, F-main valve plug, G-stage clip, H-main valve core retainer plate, 1-valve seat, 2-O shape is enclosed, 3-level pressure spring, 4-guide valve seat, the little oil circuit oil outlet of 4a-, 4b-regulates chamber fuel feed hole, 4c-first cylindrical cavity, 4d-second cylindrical cavity, 4e-first round platform chamber, 4f-three cylindrical chamber, 4g-second round platform chamber, 5-spring perch, 6-steel ball, 7-spool, 7a-damping hole, 8-main spool spring, 9-valve core housing, the large oil circuit oil outlet of 9a-, the main oil inlet of 9b-, 9c-thin-wall sleeve.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Hydraulic steering gear unloader valve, comprises valve seat 1, level pressure spring 3, guide valve seat 4, spring perch 5, steel ball 6, spool 7, main spool spring 8 and valve core housing 9.
Described guide valve seat 4 inside offers the adjustment chamber of accommodating level pressure spring 3, spring perch 5 and a steel ball 6, and guide valve seat 4 offer all with regulate the little oil circuit oil outlet 4a that is connected of chamber and regulate chamber fuel feed hole 4b.Described level pressure spring 3 one end contacts valve seat 1, and the other end contacts spring perch 5.Described steel ball 6 is arranged in the groove on spring perch 5; Described steel ball 6 touches with guide valve seat 4 inwall thus closes and regulates chamber fuel feed hole 4b.
Further, the adjustment chamber of described guide valve seat 4 from left to right comprises the first cylindrical cavity 4c, the second cylindrical cavity 4d, the first round platform chamber 4e, three cylindrical chamber 4f and the second round platform chamber 4g.The internal diameter of described second cylindrical cavity 4d is greater than the internal diameter of the first cylindrical cavity 4c and the external diameter of spring perch 5 simultaneously, and described little oil circuit oil outlet 4a is communicated with the second cylindrical cavity 4d.Spring perch 5 is when moving to left, and spring perch 5 and the second cylindrical cavity 4d maintain interval, and hydraulic oil can flow into little oil circuit oil outlet 4a from the interval of spring perch 5 and the second cylindrical cavity 4d.Going to the bottom of first round platform chamber 4e is connected with the second cylindrical cavity 4d, and upper base is connected with three cylindrical chamber 4f.The diameter of going to the bottom of the first round platform chamber 4e is greater than the diameter of steel ball 6, and upper base diameter is less than the diameter of steel ball 6.Steel ball 6 touches the circumference of the first round platform chamber 4e upper base, thus closes the passage of the first round platform chamber 4e and three cylindrical chamber 4f.First round platform chamber 4e is conducive to lock ball 6, makes when steel ball 6 is in time regulating chamber fuel feed hole 4b, the position of steel ball 6 slightly deviation time still can regulate chamber fuel feed hole 4b by fast sealing.Going to the bottom of described second round platform chamber 4g is connected with three cylindrical chamber 4f, and upper base is connected with adjustment chamber fuel feed hole 4b.
As preferably, the external diameter of spring perch 5 is 5.4mm, and the internal diameter of the first cylindrical cavity 4c is 6mm, and the internal diameter of the second cylindrical cavity 4d is 6.8mm, and the cone angle of described first round platform chamber 4e is 90 °, and the cone angle of the second round platform chamber 4g is 120 °.The external diameter of whole unloader valve is 18.5mm, and meanwhile, 18.5mm is also the external diameter of valve seat 1.Therefore, this unloader valve is applicable to be assemblied in the narrow and small hydraulic steering gear of installing space.
Because steel ball 6 and level pressure spring 3 are standardized component, spring perch 5 is also easy to processing, and the structure of each parts is little, is also suitable for the hydraulic steering gear being assemblied in narrow space, because this reducing the productive costs of unloader valve.
Described guide valve seat 4 and valve seat 1 are threaded.Because this valve needs constant pressure, but manufacturing tolerance, as the length of spring, the working accuracy of each part, this valve time processing cannot be assembled and just can reach accurate expecting pressure.This detachable structure, while the installation question solving guide valve seat 4 and level pressure spring 3, facilitates the secondary pressure regulation of this valve, and the error making this valve overcome working accuracy to bring, can reach expecting pressure after assembling smoothly.
O shape circle 2 is arranged with, in order to prevent the hydraulic oil crossfire flowed out from little oil circuit oil outlet 4a outside described valve seat 1.
It is inner that described main spool spring 8 is arranged at spool 7, and one end contacts guide valve seat 4, and the other end contacts spool 7 inwall; It is inner that described spool 7 is sheathed on valve core housing 9, and with valve core housing 9 bearing fit; Described spool 7 offers damping hole 7a; Described valve core housing 9 offers large oil circuit oil outlet 9a and main oil inlet 9b.
Valve core housing 9 left end has been wholely set thin-wall sleeve 9c, and the thickness of thin-wall sleeve 9c is less than the thickness of valve core housing 9 body.It is outside that thin-wall sleeve 9c is sheathed on guide valve seat 4, and with guide valve seat 4 interference fit.Described guide valve seat 4 and valve core housing 9 interference fit, simultaneously due to valve core housing 9 and spool 7 bearing fit, therefore, guide valve seat 4, valve core housing 9 and spool 7 are enclosed to form an oil suction chamber.Valve seat 4 is little with valve core housing 9 structure, do not allow leakage, cannot use and be threaded, so guide valve seat 4 and valve core housing 9 adopt thin-walled interference fit, again due to valve core housing 9 and spool 7 bearing fit, precision size, the junction that valve core housing 9 is sheathed on guide valve seat 4 is thin-walled valve pocket, ensure that guide valve seat 4 does not affect the distortion of valve core housing 9 with the interference fit of valve core housing 9, ensure that the degree of precision that valve core housing 9 and spool 7 coordinate.
When unloader valve is in dead position, under the effect of level pressure spring 3, steel ball 6 is blocked and is regulated chamber fuel feed hole 4b, damping hole 7a and little oil circuit oil outlet 4a not conducting; Under the effect of main spool spring 8, on the right side of spool 7, touch valve core housing 9 inwall, main oil inlet 9b and large oil circuit oil outlet 9a not conducting.Now Hydraulic Pump delivery rate all flows into work system.
Oil pressure when damping hole 7a place increases, and when the pressure of hydraulic oil to steel ball 6 is greater than the application force of level pressure spring 3 pairs of spring perches 5, steel ball 6 and spring perch 5 move to left, and section hydraulic oil enters guide valve seat 4 inside and flows out from little oil circuit oil outlet 4a.Now, damping hole 7a and little oil circuit oil outlet 4a conducting, running of hydraulic power oil in unloader valve, thus the inside and outside generation difference of pressure of spool 7 is moved to the left opens, and main oil inlet 9b is communicated with large oil circuit oil outlet 9a, and unloader valve is opened.Hydraulic Pump delivery rate part flow to oil sump tank by large oil circuit oil outlet 9a and little oil circuit oil outlet 4a.By unloader valve to system unloaded, system pressure no longer raises.
Described spring perch 5 comprises the cylinder and ear that are wholely set; It is inner that described cylinder is inserted in level pressure spring 3, thus the relative position of positioning ejection spring abutment 5 and level pressure spring 3; Described level pressure spring 3 contacts in ear, for spring perch 5 provides bearing capacity to the right.
As shown in Figure 5, traditional product, after flow system flow increases, because the through-current capability of product is limited, causes system pressure to raise rapidly.System pressure is too high all exists certain risk to steering pump and deflector.And this product has good through-flow property, system pressure is substantially no longer raised, highly sensitive, successful.
The utility model is illustrated according to embodiment, and under the prerequisite not departing from present principles, this device can also make some distortion and improvement.It should be pointed out that and all drop on the technical scheme that all employings are equal to replacement or the mode such as equivalent transformation and obtain in protection domain of the present utility model.
Claims (5)
1. hydraulic steering gear unloader valve, is characterized in that, comprises valve seat (1), level pressure spring (3), guide valve seat (4), spring perch (5), steel ball (6), spool (7), main spool spring (8) and valve core housing (9); Described guide valve seat (4) inside offers the adjustment chamber of an accommodating level pressure spring (3), spring perch (5) and steel ball (6), and guide valve seat (4) offers all with the little oil circuit oil outlet (4a) regulating chamber to be connected with regulate chamber fuel feed hole (4b); Described level pressure spring (3) one end contacts valve seat (1), and the other end contacts spring perch (5); Described steel ball (6) is arranged in the groove on spring perch (5); Described steel ball (6) and guide valve seat (4) inwall touch thus close and regulate chamber fuel feed hole (4b); It is inner that described main spool spring (8) is arranged at spool (7), and one end contacts guide valve seat (4), and the other end contacts spool (7) inwall; It is inner that described spool (7) is sheathed on valve core housing (9), and with valve core housing (9) bearing fit; Described spool (7) offers damping hole (7a); Described valve core housing (9) offers large oil circuit oil outlet (9a) and main oil inlet (9b).
2. hydraulic steering gear unloader valve as claimed in claim 1, it is characterized in that, described valve seat (1) and guide valve seat (4) are threaded, and are arranged with O shape circle (2) outside described valve seat (1).
3. hydraulic steering gear unloader valve as claimed in claim 1, is characterized in that, described guide valve seat (4) and valve core housing (9) interference fit; Valve core housing (9) left end is provided with thin-wall sleeve (9c), and the thickness of thin-wall sleeve (9c) is less than the thickness of valve core housing (9) body; It is outside that thin-wall sleeve (9c) is sheathed on guide valve seat (4), and with guide valve seat (4) interference fit.
4. hydraulic steering gear unloader valve as claimed in claim 1, it is characterized in that, the adjustment chamber of guide valve seat (4) from left to right comprises the first cylindrical cavity (4c), the second cylindrical cavity (4d), the first round platform chamber (4e), three cylindrical chamber (4f) and the second round platform chamber (4g); The internal diameter of described second cylindrical cavity (4d) is greater than the internal diameter of the first cylindrical cavity (4c) and the external diameter of spring perch (5) simultaneously, and described little oil circuit oil outlet (4a) is communicated with the second cylindrical cavity (4d); Going to the bottom of first round platform chamber (4e) is connected with the second cylindrical cavity (4d), and upper base is connected with three cylindrical chamber (4f); The diameter of going to the bottom in the first round platform chamber (4e) is greater than the diameter of steel ball (6), and upper base diameter is less than the diameter of steel ball (6); Steel ball (6) touches the circumference of the first round platform chamber (4e) upper base, thus closes the passage of the first round platform chamber (4e) and three cylindrical chamber (4f); Going to the bottom of described second round platform chamber (4g) is connected with three cylindrical chamber (4f), and upper base is connected with adjustment chamber fuel feed hole (4b).
5. hydraulic steering gear unloader valve as claimed in claim 1, it is characterized in that, described spring perch (5) comprises the cylinder and ear that are wholely set; Ear is fixedly arranged on cylindrical end face; It is inner that described cylinder is inserted in level pressure spring (3); Described level pressure spring (3) contacts in ear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420803300.9U CN204383560U (en) | 2014-12-18 | 2014-12-18 | Hydraulic steering gear unloader valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420803300.9U CN204383560U (en) | 2014-12-18 | 2014-12-18 | Hydraulic steering gear unloader valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204383560U true CN204383560U (en) | 2015-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420803300.9U Active CN204383560U (en) | 2014-12-18 | 2014-12-18 | Hydraulic steering gear unloader valve |
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| Country | Link |
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| CN (1) | CN204383560U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104443018A (en) * | 2014-12-18 | 2015-03-25 | 临海市嘉美机械制造有限公司 | Unloading valve of hydraulic steering gear |
-
2014
- 2014-12-18 CN CN201420803300.9U patent/CN204383560U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104443018A (en) * | 2014-12-18 | 2015-03-25 | 临海市嘉美机械制造有限公司 | Unloading valve of hydraulic steering gear |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |