CN203604298U - Pressure stop valve of hydraulic variable displacement motor - Google Patents
Pressure stop valve of hydraulic variable displacement motor Download PDFInfo
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- CN203604298U CN203604298U CN201320725564.2U CN201320725564U CN203604298U CN 203604298 U CN203604298 U CN 203604298U CN 201320725564 U CN201320725564 U CN 201320725564U CN 203604298 U CN203604298 U CN 203604298U
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- valve
- pressure
- valve rod
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- variable displacement
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Abstract
The utility model discloses a pressure stop valve of a hydraulic variable displacement motor. The pressure stop valve comprises a valve body and a valve rod, wherein the valve body is provided with a valve cavity, and the valve rod is arranged in the valve body in an inserted mode; one end of the valve rod is provided with a reversing spring and communicated with an oil tank; the valve cavity is provided with a working oil port, a high-pressure port and an oil return port; the working oil port is communicated with a large cavity of a variable displacement cylinder of the hydraulic variable displacement motor, the high-pressure port is communicated with a small cavity of the variable displacement cylinder, and the oil return port is communicated with the low-pressure end of the valve rod; the valve rod moves, and the communication state of the working oil port and the oil return port or the high-pressure port; a groove is formed in the other end of the valve rod in the circumferential direction, the groove is communicated with the high-pressure side of the hydraulic variable displacement motor through an inlet damping assembly and communicated with the oil tank through a bypass damping assembly. Thus, the acting area of reversing pressure of the valve rod is reduced, reversing impact is reduced, and therefore the valve rod operates stably, and intermittent shaking of the hydraulic variable displacement motor caused by excessively sensitive response of the valve rod is avoided.
Description
Technical field
The utility model relates to hydraulics field, particularly relates to a kind of pressure shut-off valve of hydraulic variable motor.
Background technique
Hoist is in the time of lifting operation, the weight of each lifting weight differs, conventionally wish when lifting weight is heavy can sling, lifting weight hangs lifting speed than very fast when light, be heavy-duty low-speed, underloading high speed, therefore according to the working condition requirement of hoist, crane hoisting mechanism generally all adopts variable displacement motor to drive.
A kind of variable displacement motor generally adopting is in the market HD1D(hydraulic control, pressure cut off) type variable displacement motor, this kind of variable displacement motor is in the time of work, motor displacement by large discharge capacity to small displacement, motor operations pressure raises gradually, in the time reaching setup pressure value, need cut-out pressure, make motor displacement become large, until adapt with system works pressure.Particularly, realize the cut-out of motor pressure by pressure shut-off valve.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of pressure shut-off valve in prior art.
As shown in Figure 1, pressure shut-off valve 100 comprises valve body 101 and valve rod 102, and the right-hand member of valve rod 102 is low voltage terminal, and is provided with commutation spring 103, and the left end of valve rod 102 is high voltage terminal, is communicated with the high pressure side of variable displacement motor.The left and right is here that the correlation in figure and between component is as benchmark definition, following identical therewith take component in Fig. 1, repeats no more.
Pressure shut-off valve 100 has three valve ports, i.e. actuator port M, oil return inlet T and high-pressure mouth G; Wherein, actuator port M is communicated with the large chamber (rodless cavity) of the variable cylinder 200 of variable displacement motor; High-pressure mouth G is communicated with the high pressure side of variable displacement motor, and is communicated with the loculus (rod chamber) of variable cylinder 200, i.e. the loculus normal open high pressure of variable cylinder 200.When the valve rod 102 of pressure shut-off valve 100 moves, band movable valve block 121 moves, thereby changes the connected state of actuator port M and oil return inlet T or high-pressure mouth G.
In working procedure, when the pressure of valve rod 102 high voltage terminals is during lower than the setting pressure of commutation spring 103, valve rod 102 is moved to the left, its valve piece 121 moves to left simultaneously, and actuator port M is communicated with high-pressure mouth G, and high pressure oil is by the large chamber of high-pressure mouth G entering variable cylinder 200, thereby variable piston 201 moves right, the discharge capacity of variable displacement motor diminishes, and the pressure of valve rod 102 high voltage terminals rises thereupon, until the stressed balance that reaches of valve rod 102;
When the pressure of valve rod 102 high voltage terminals is during higher than the setting pressure of commutation spring 103, valve rod 102 moves right, its valve piece 121 moves to right simultaneously, actuator port M is communicated with oil return inlet T, be the logical low pressure in large chamber of variable cylinder 200, thereby variable piston 201 is moved to the left, it is large that the discharge capacity of variable displacement motor becomes, the pressure of valve rod 102 high voltage terminals declines thereupon, until the stressed balance that reaches of valve rod 102;
In the time that the pressure of valve rod 102 high voltage terminals equals to commutate the setting pressure of spring 103, the valve piece 121 of valve rod 102 is positioned at meta, shutoff actuator port M, variable piston 201 attonitys of variable cylinder 200.
But above-mentioned pressure shut-off valve in the course of the work, finds to exist following problems:
The commutate active area of pressure of pressure shut-off valve 100 is larger, is the left side of valve rod 102, makes valve rod 102 not steady in running, and reversing impact is larger; As long as the pressure of valve rod 102 high voltage terminals exists fluctuation, valve rod 102 makes an immediate response, and moves around, not only reduce the stability of pressure shut-off valve 100, easily cause the intermittence shake of variable displacement motor, and increased the wearing and tearing of valve rod 102, reduced the working life of pressure shut-off valve 100.
In addition, because the valve port of pressure shut-off valve 100 adopts meta zero lap, in the commutation process of valve rod 102, make supercharging, the pressure release of actuator port M very fast, particularly, in the time that valve rod 102 is moved to the left actuator port M and is communicated with high-pressure mouth G, because high-pressure mouth G is high pressure spot, actuator port M is easy to form instantaneous pressure and impacts, and makes the large cavity pressure fluctuation of variable cylinder 200 larger, thereby causes variable piston 201 bumpy motions.
In view of this, how improving the pressure shut-off valve of hydraulic variable motor, to improve the stability of pressure shut-off valve, extend the working life of pressure shut-off valve, is the current technical issues that need to address of those skilled in the art.
Model utility content
The purpose of this utility model is to provide a kind of pressure shut-off valve of hydraulic variable motor, and the valve rod of this pressure shut-off valve operates steadily, and stability is high, and long service life.
For solving the problems of the technologies described above, the utility model provides a kind of pressure shut-off valve of hydraulic variable motor, comprises the valve body with valve pocket and the valve rod that is plugged in described valve body; One end of described valve rod is provided with commutation spring, and is communicated with fuel tank;
Described valve pocket is provided with actuator port, high-pressure mouth and return opening; Described actuator port is communicated with the large chamber of the variable cylinder of described hydraulic variable motor, and described high-pressure mouth is communicated with the loculus of described variable cylinder, and described return opening is communicated with the low voltage terminal of described valve rod;
Described valve rod drives the valve piece on it to move while movement, to change the connected state of described actuator port and described return opening or described high-pressure mouth;
The other end of described valve rod is along being circumferentially with groove, and described groove is communicated with the high pressure side of described hydraulic variable motor, and is communicated with fuel tank.
So design, the commutation active area of described valve rod high voltage terminal (establishing reeded one end) is the end face that forms described groove, compared with the whole left side of valve rod in background technique, the active area of commutation pressure obviously reduces, reduce reversing impact, made valve rod comparatively steady in running; And, because the active area of commutation pressure reduces, in the time there is small size pressure surge in the high pressure side of described hydraulic variable motor, valve rod can not respond rapidly, avoid unnecessary moving around, and the shake of the intermittence of the hydraulic variable motor causing thus, also reduce the wearing and tearing of valve rod simultaneously, extend the working life of pressure shut-off valve.
Preferably, described valve rod has the axial hole for pressure release.
So design, can avoid cannot responding because of the valve rod that the active area of commutation pressure significantly reduces to cause; And arranging of axial hole can increase the viscous resistance of valve rod in movement process, improve the stability of system.
Preferably, described return opening is opened in the perisporium of described valve rod, and connects with described axial hole.
Preferably, described groove is circular groove.
So design, commutation pressure is circumferentially uniformly distributed along valve rod, makes operating steadily of valve rod, has avoided deflection.
Preferably, the jointing being communicated with fuel tank on described circular groove is provided with bypass damper assembly.
Preferably, the jointing being communicated with described high pressure side on described circular groove is provided with import damper assembly, and its damping is less than the damping of described bypass damper assembly.
So design, can effectively reduce the reversing impact of valve rod, improve the stability of system by the coupling of bypass damper assembly and import damper assembly.
Preferably, on described valve piece, offer the by-pass hole being communicated with described axial hole.
So design, when valve rod commutation, by the bypass buffering of by-pass hole, can avoid valve piece to cause instantaneous pressure to impact.
Preferably, four of described valve piece jiaos are all made as chamfering.
So design, valve rod when commutation, can slow down supercharging or the pressure release of the actuator port that pressure shut-off valve is communicated with the large chamber of variable cylinder, when particularly this actuator port is communicated with high-pressure mouth, avoid pressure surge larger in variable cylinder, made the variable piston movement of variable cylinder more steady.
Accompanying drawing explanation
Fig. 1 is the structural representation that in prior art, pressure shut-off valve is connected with the variable cylinder of hydraulic variable motor;
The structural representation that Fig. 2 is connected with the variable cylinder of hydraulic variable motor for pressure shut-off valve that the utility model provides.
In Fig. 1:
Pressure shut-off valve 100, valve body 101, valve rod 102, valve piece 121, commutation spring 103, variable cylinder 200, variable piston 201;
In Fig. 2:
Pressure shut-off valve 30, valve body 31, valve rod 32, valve piece 321, groove 32a, axial hole 32b, by-pass hole 32c, commutation spring 33, bypass damper assembly 34, import damper assembly 35; Variable cylinder 40, variable piston 41.
Embodiment
Core of the present utility model is to provide a kind of pressure shut-off valve of hydraulic variable motor, and the valve rod of this pressure shut-off valve operates steadily, and stability is high, and long service life.
In order to make those skilled in the art person understand better the utility model scheme, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to Fig. 2, Fig. 2 provides the structural representation of a kind of embodiment of pressure shut-off valve for the utility model.
In this embodiment, the pressure shut-off valve 30 of hydraulic variable motor, comprises the valve body 31 with valve pocket and the valve rod 32 that is plugged in valve body 31; One end of valve rod 32 is provided with commutation spring 32, and is communicated with fuel tank;
Described valve pocket is provided with actuator port M, high-pressure mouth G and oil return inlet T; Wherein, actuator port M is communicated with the large chamber (rodless cavity) of variable cylinder 40 of hydraulic variable motor, and high-pressure mouth G is communicated with the loculus (rod chamber) of variable cylinder 40, and oil return inlet T is communicated with the low voltage terminal of valve rod 32, and the one end that is provided with valve rod 32 spring 33 that commutates is communicated with;
When valve rod 32 moves, drive the valve piece 321 on it to move, can change the connected state of actuator port M and oil return inlet T or high-pressure mouth G;
The other end of valve rod 32 is along being circumferentially with groove 32a, and this groove 32a is communicated with the high pressure side of described hydraulic variable motor, and is communicated with fuel tank.
Wherein, high-pressure mouth G is also communicated with the high pressure side of described hydraulic variable motor.
In this embodiment, the other end of valve rod 32 is along being circumferentially with groove 32a, this groove 32a is communicated with the high pressure side of hydraulic variable motor, so design, the commutate active area of pressure of valve rod 32 is the right side (being as the criterion with Fig. 2 diagram) that forms groove 32a, and compared with the whole face area of valve rod in background technique, the active area of commutation pressure obviously reduces, reduce reversing impact, made valve rod 32 comparatively steady in running; In addition, because the active area of commutation pressure reduces, in the time there is small size pressure surge in the high pressure side of described hydraulic variable motor, valve rod 32 can not respond rapidly, avoid unnecessary moving around, and the shake of the intermittence of the hydraulic variable motor causing thus, also reduce the wearing and tearing of valve rod 32 simultaneously, extend the working life of pressure shut-off valve 30.
The working procedure of this pressure shut-off valve 30 is as follows:
When the pressure of valve rod 32 high voltage terminals is during lower than the setting pressure of commutation spring 33, valve rod 32 is moved to the left, band movable valve block 321 moves to left, now, actuator port M is communicated with high-pressure mouth G, and high pressure oil is by the large chamber of high-pressure mouth G entering variable cylinder 40, thereby promoting variable piston 41 moves right, the discharge capacity of hydraulic variable motor diminishes, and the pressure rise of valve rod 32 high voltage terminals, until the stressed balance that reaches of valve rod 32;
When the pressure of valve rod 32 high voltage terminals is during higher than the setting pressure of commutation spring 33, valve rod 32 moves right, band movable valve block 321 moves to right, now, actuator port M is communicated with oil return inlet T, and low pressure oil is by the large chamber of oil return inlet T entering variable cylinder 40, variable piston 41 is moved to the left, it is large that the discharge capacity of hydraulic variable motor becomes, and the pressure drop of valve rod 32 high voltage terminals, until the stressed balance that reaches of valve rod 32;
In the time that the setting pressure of the pressure of valve rod 32 high voltage terminals and commutation spring 33 is consistent, the valve piece 321 of valve rod 32 is positioned at meta, i.e. shutoff actuator port M, variable piston 41 attonitys of variable cylinder 40.
It is pointed out that above-mentioned noun of locality left and right is to be arranged in figure and component position relationship each other defines with component in Fig. 2, just in order to explain the clear and convenient of technological scheme; Should be appreciated that the noun of locality adopting should not limit the protection domain of the application's request herein.
Can make improvement to above-mentioned pressure shut-off valve 30.
Further, described valve rod 32 has the axial hole 32b for pressure release.
So, the axial hole 32b of pressure release is set at valve rod 32, can avoids because the valve rod 32 that the active area of commutation pressure significantly reduces to cause cannot respond, and, arranging of axial hole 32b can increase the viscous resistance of the valve of valve rod 32 piece 321 in movement process, improves the stability of system.
On the basis of the above, oil return inlet T can be opened in to the perisporium of valve rod 32, and connect with axial hole 32b.
So, can reduce the connecting pipeline between oil return inlet T and fuel tank, reduce costs.
Further, above-mentioned groove 32a is circular groove; So design, commutation pressure is circumferentially uniformly distributed along valve rod 32, makes operating steadily of valve rod 32, avoids occurring the bad phenomenon such as deflection.
Further, the jointing being communicated with fuel tank on described circular groove is provided with bypass damper assembly 34; So design, can pass through the back-flow velocity of bypass damper assembly 34 regulator solution force feeds, effectively reduces the impact that valve rod 32 commutates, and improves the stability of system.
On this basis, the jointing that also can be communicated with the high pressure side of hydraulic variable motor on circular groove arranges import damper assembly 35, and its damping is less than the damping of bypass damper assembly 34; Can further reduce the reversing impact of valve rod 32 by the coupling of two damper assemblies, improve the stability of system.
Wherein, the concrete structure of each damper assembly can design with reference to prior art.
Further, on the valve piece 321 of valve rod 32, offer the by-pass hole 32c being communicated with axial hole 32b.
So design, when valve rod 32 commutates, by the bypass buffering of by-pass hole 32c, can avoid valve piece 321 to cause instantaneous pressure to impact.
Further, four jiaos of the valve piece 321 of valve rod 32 are all made as chamfering.
So design, when valve rod 32 commutates, can slow down supercharging or the pressure release of actuator port M, particularly actuator port M and be communicated with high-pressure mouth G time, has avoided larger pressure surge in variable cylinder 40, makes the variable piston 41 of variable cylinder 40 move more steady.
Above the pressure shut-off valve of hydraulic variable motor provided by the utility model is described in detail.Applied specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present utility model and core concept thereof.Should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (8)
1. a pressure shut-off valve for hydraulic variable motor, comprises the valve body with valve pocket and the valve rod that is plugged in described valve body; One end of described valve rod is provided with commutation spring, and is communicated with fuel tank;
Described valve pocket is provided with actuator port, high-pressure mouth and return opening; Described actuator port is communicated with the large chamber of the variable cylinder of described hydraulic variable motor, and described high-pressure mouth is communicated with the loculus of described variable cylinder, and described return opening is communicated with the low voltage terminal of described valve rod;
Described valve rod drives the valve piece on it to move while movement, to change the connected state of described actuator port and described return opening or described high-pressure mouth; It is characterized in that:
The other end of described valve rod is along being circumferentially with groove, and described groove is communicated with the high pressure side of described hydraulic variable motor, and is communicated with fuel tank.
2. pressure shut-off valve as claimed in claim 1, is characterized in that, described valve rod has the axial hole for pressure release.
3. pressure shut-off valve as claimed in claim 2, is characterized in that, described return opening is opened in the perisporium of described valve rod, and connects with described axial hole.
4. pressure shut-off valve as claimed in claim 1, is characterized in that, described groove is circular groove.
5. pressure shut-off valve as claimed in claim 4, is characterized in that, the jointing being communicated with fuel tank on described circular groove is provided with bypass damper assembly.
6. pressure shut-off valve as claimed in claim 5, is characterized in that, the jointing being communicated with described high pressure side on described circular groove is provided with import damper assembly, and its damping is less than the damping of described bypass damper assembly.
7. the pressure shut-off valve as described in claim 1 to 6 any one, is characterized in that, on described valve piece, offers the by-pass hole being communicated with described axial hole.
8. the pressure shut-off valve as described in claim 1 to 6 any one, is characterized in that, four jiaos of described valve piece are all made as chamfering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320725564.2U CN203604298U (en) | 2013-11-15 | 2013-11-15 | Pressure stop valve of hydraulic variable displacement motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320725564.2U CN203604298U (en) | 2013-11-15 | 2013-11-15 | Pressure stop valve of hydraulic variable displacement motor |
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| Publication Number | Publication Date |
|---|---|
| CN203604298U true CN203604298U (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320725564.2U Expired - Fee Related CN203604298U (en) | 2013-11-15 | 2013-11-15 | Pressure stop valve of hydraulic variable displacement motor |
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| Country | Link |
|---|---|
| CN (1) | CN203604298U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727080A (en) * | 2013-11-15 | 2014-04-16 | 徐州重型机械有限公司 | Pressure stop valve of hydraulic variable displacement motor |
-
2013
- 2013-11-15 CN CN201320725564.2U patent/CN203604298U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727080A (en) * | 2013-11-15 | 2014-04-16 | 徐州重型机械有限公司 | Pressure stop valve of hydraulic variable displacement motor |
| CN103727080B (en) * | 2013-11-15 | 2016-02-24 | 徐州重型机械有限公司 | A kind of pressure shut-off valve of hydraulic variable motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20181115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |