CN107642486B - Novel plunger pump static pressure supports side cap - Google Patents
Novel plunger pump static pressure supports side cap Download PDFInfo
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- CN107642486B CN107642486B CN201711014748.7A CN201711014748A CN107642486B CN 107642486 B CN107642486 B CN 107642486B CN 201711014748 A CN201711014748 A CN 201711014748A CN 107642486 B CN107642486 B CN 107642486B
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- side cover
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- 230000003068 static effect Effects 0.000 title claims abstract description 46
- 238000007789 sealing Methods 0.000 claims description 59
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 21
- 230000002706 hydrostatic effect Effects 0.000 claims description 11
- 239000003921 oil Substances 0.000 description 105
- 239000010720 hydraulic oil Substances 0.000 description 16
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The invention discloses a novel plunger pump static pressure support side cover which comprises a side cover outer cover and a side cover bushing, wherein the side cover bushing is an extending end of the side cover outer cover extending along the inner side end surface of the side cover outer cover, a cavity is formed between the side cover bushing and the side cover outer cover along the axial direction of the side cover bushing, an oil duct system is arranged on the side cover outer cover, a static pressure support system is arranged on the side cover bushing, and the oil duct system is connected with the static pressure support system. The static pressure support system comprises an oil outlet passage and a plurality of throttle passages, wherein the oil outlet passage is arranged along the axial direction of the side cover bushing, and one end of the oil outlet passage is connected with the oil passage system; one end of the throttle channel is connected with the oil outlet channel, and the other end is communicated to the side wall of the inner cavity. Through the static pressure supporting principle, the static pressure supporting system is arranged in the side cover, so that an oil film is generated on the side wall of the cavity of the side cover, friction is prevented from being generated by direct contact between the variable rod and the cavity of the side cover, and the problem that the side cover is easy to wear is solved.
Description
Technical Field
The invention relates to the field of plunger pumps, in particular to a novel plunger pump static pressure support side cover.
Background
The plunger pump is an important device of a hydraulic system, and the plunger pump realizes oil suction by means of reciprocating motion of a plunger in a cylinder body to change the volume of a sealed working cavity. The side cover is an important component of the variable displacement pump, and because the variable displacement rod of the variable displacement pump needs to do high-frequency axial movement in the side cover, the force exerted on the side cover by the variable displacement rod in the high-frequency movement in the side cover is lateral, namely, a radial force, so that the side cover is easy to wear after long-time movement.
In the prior art, after machining, the whole side cover is integrally removed for heat treatment, so that the hardness, the wear resistance and the like of the side cover are improved, and the service life of the side cover is prolonged. However, the heat treatment of the side cover only improves the hardness, the wear resistance, etc. of the side cover to some extent, but does not increase infinitely, and the side wall of the side cover is still worn after long-term use. The existing side cover is characterized in that an oil inlet and an oil inlet pipeline are arranged on the outer cover of the side cover, when the variable rod moves axially outwards along the cavity of the side cover, hydraulic oil is sucked into the side cover from the oil inlet, and flows into the cavity of the side cover through the oil inlet pipeline, so that the oil suction function is realized; when the variable rod moves axially inwards along the cavity of the side cover, the function of pressing oil is realized, but the side walls of the variable rod and the cavity of the side cover can generate friction due to long-time reciprocating movement, so that the side cover is worn, and the service life of the side cover and the overall performance of the plunger pump are influenced.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a novel plunger pump static pressure support side cover, a static pressure support system is arranged in the side cover through a static pressure support principle, so that an oil film is generated on the side wall of a side cover cavity, friction is prevented from being generated by direct contact between a variable rod and the side cover cavity, and the problem that the side cover is easy to wear is solved. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a novel plunger pump static pressure supports side cap, includes side cap enclosing cover and side cap bush, the side cap bush is the side cap enclosing cover along the extension end that its inboard terminal surface extended, the side cap bush along its axial with be provided with the cavity between the side cap enclosing cover, set up the oil duct system on the side cap enclosing cover, set up the static pressure braced system on the side cap bush, the oil duct system with the static pressure braced system is connected.
Preferably, the side cover outer cover is provided with a through hole along an axial direction thereof, the through hole penetrates through the side cover outer cover and is connected with the cavity, and a concave surface is arranged on an outer side end surface of the side cover outer cover, which is contacted with one end of the through hole.
Preferably, the oil duct system includes a first oil duct system disposed at an upper half of the side cover outer cover, and a second oil duct system disposed at a lower half of the side cover outer cover.
Preferably, the first oil duct system comprises an oil inlet and a first oil inlet duct, the oil inlet is connected with the first oil inlet duct, the first oil inlet duct is arranged along the circumferential direction of the side cover outer cover, the upper end of the first oil inlet duct extends to the upper end face of the side cover outer cover, the upper end of the first oil inlet duct is closed by a process plug, the lower end of the first oil inlet duct is connected with a first oil outlet, and the first oil outlet is arranged on the bottom wall of the cavity.
Preferably, the second oil duct system includes a second oil inlet duct, the second oil inlet duct is arranged along the circumference of the side cover outer cover, the lower end of the second oil inlet duct extends to the lower end face of the side cover outer cover, the lower end of the second oil inlet duct is closed by a process plug, the upper end of the second oil inlet duct is connected with a second oil outlet, and the second oil outlet is arranged on the bottom wall of the cavity.
Preferably, the static pressure support system comprises an oil outlet channel and a plurality of throttling channels, wherein the oil outlet channel is arranged along the axial direction of the side cover bushing, and one end of the oil outlet channel is connected with the oil channel system; one end of the throttle channel is connected with the oil outlet channel, and the other end of the throttle channel is communicated to the side wall of the inner cavity.
Preferably, the static pressure support system is arranged at the upper end part of the side cover bushing above the cavity; or the static pressure support system is arranged at the lower end part of the side cover bushing below the cavity; or the static pressure support system is arranged at the upper end part and the lower end part of the side cover bushing.
Preferably, a plurality of pressure equalizing grooves are formed in the side wall of the cavity, and the pressure equalizing grooves are arranged along the circumferential direction of the cavity.
Preferably, a process hole is formed in the outer side end face of the side cover outer cover, one end of the process hole is connected with the oil outlet channel, and the other end of the process hole is closed by a process plug.
Preferably, the static pressure support side cover further comprises a sealing assembly, the sealing assembly comprises sealing elements and sealing connecting elements, the sealing connecting elements are connected with the through holes through threads, the sealing elements are installed on the sealing connecting elements, the sealing elements are arranged in the concave surfaces and close the through holes, sealing rings are further arranged between the sealing elements and the concave surfaces, the number of the sealing elements is at least 1, and the sealing rings can prevent hydraulic oil from exuding.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the plunger pump static pressure support side cover, the oil duct system is arranged on the side cover outer cover, the static pressure support system is arranged on the side cover lining, the plunger pump static pressure support side cover is connected with the static pressure support system through the oil duct system, hydraulic oil enters the static pressure support system through the oil duct system, an oil film layer is generated on the side wall of a side cover cavity, and direct contact between a variable rod and the side wall of the cavity is avoided. The oil duct system comprises a first oil duct system and a second oil duct system, in the working process of the plunger pump, hydraulic oil is sucked into the cavity from the first oil duct system through the variable rod and axially moves outwards along the cavity of the side cover, then enters the static pressure supporting system through the second oil duct system, the throttling channel plays a role in fixed damping when the hydraulic oil flows in the static pressure supporting system, after the hydraulic oil enters the throttling channel from the oil outlet channel, the oil pressure in the oil outlet channel is changed after being damped, the hydraulic oil after the pressure change is conveyed between the side wall of the cavity and the variable rod, a stable oil film is formed, contact friction between the cavity of the side cover and the variable rod is avoided, and abrasion of the side cover is reduced.
Through the through-hole of sealing the side cap of sealing member and sealing connection spare, can prevent that hydraulic oil from oozing from the side cap, the sealing member adopts at least 1, can ensure sealed firm. The sealing ring is arranged in the concave surface on the outer side end surface of the side cover outer cover, so that the sealing ring can be prevented from moving, and the sealing ring is convenient to install.
Drawings
FIG. 1 is a schematic cross-sectional view of a hydrostatic support side cover of a plunger pump according to the present invention;
fig. 2 is a schematic structural view of the hydrostatic support side cover and variable lever assembly of the plunger pump of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the following examples, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, but the scope of the present invention is not limited to the following specific examples.
Example 1:
as shown in fig. 1, a novel plunger pump hydrostatic support side cap comprises a side cap outer cap 1 and a side cap liner 2, wherein the side cap liner 2 is an extending end of the side cap outer cap 1 extending along the inner side end face thereof, a cavity 10 is arranged between the side cap liner 2 and the side cap outer cap 1 along the axial direction thereof, the cavity 10 is arranged on the side cap liner, and the inner side end face of the side cap outer cap 1 is a bottom wall 101 of the cavity. The side cover outer cover 1 is provided with the through-hole along its axial, the through-hole sets up in the central point of side cover outer cover 1 put or all the other positions can, the through-hole runs through side cover outer cover 1 and be connected to cavity 10 makes the through-hole with cavity 10 connects, with the outside terminal surface of side cover outer cover 1 that the through-hole one end contacted is provided with concave surface 18, and the size of concave surface 18 is greater than the through-hole size, and the one end of through-hole sets up in concave surface 18. In this embodiment, the side cover outer cover 1 and the side cover bushing 2 are integrally formed.
An oil duct system is arranged on the side cover outer cover 1, a static pressure supporting system is arranged on the side cover bushing 2, and the oil duct system is connected with the static pressure supporting system. The side cover outer cover 1 is divided into an upper half part and a lower half part along the axial center line of the side cover outer cover 1, the oil duct system comprises a first oil duct system and a second oil duct system, the first oil duct system is arranged on the upper half part of the side cover outer cover 1, and the second oil duct system is arranged on the lower half part of the side cover outer cover 1.
The first oil duct system comprises an oil inlet 3 and a first oil inlet duct 4, the oil inlet 3 is arranged on the side wall of the upper half part of the side cover outer cover 1, the oil inlet 3 is connected with the first oil inlet duct 4, the first oil inlet duct 4 is arranged along the circumferential direction of the side cover outer cover 1, namely, the first oil inlet duct 4 is arranged along the height direction of the side cover outer cover 1, the upper end of the first oil inlet duct 4 extends to the upper end face of the side cover outer cover 1, the upper end of the first oil inlet duct 4 is closed by a process plug 12, the lower end of the first oil inlet duct 4 is connected with a first oil outlet 5, and the first oil outlet 5 is arranged on the bottom wall 101 of the cavity 10. The second oil duct system comprises a second oil inlet duct 6, the second oil inlet duct 6 is arranged along the circumferential direction of the side cover outer cover 1, namely, the second oil inlet duct 6 is arranged along the height direction of the side cover outer cover 1, the lower end of the second oil inlet duct 6 extends to the lower end face of the side cover outer cover 1, the lower end of the second oil inlet duct 6 is closed by a process plug 12, the upper end of the second oil inlet duct 6 is connected with a second oil outlet 7, and the second oil outlet 7 is arranged on the bottom wall 101 of the cavity 10.
The static pressure support system comprises an oil outlet channel 8 and a plurality of throttling channels 9, wherein the oil outlet channel 8 is arranged along the axial direction of the side cover bushing 2, and one end of the oil outlet channel 8 is connected with a second oil inlet channel 6; one end of the throttling channel 9 is connected with the oil outlet channel 8, the other end of the throttling channel 9 is communicated to the side wall of the inner cavity 10, and the throttling channel 9 is vertically or obliquely arranged along the height direction of the side cover lining 2. The side cover bushing 2 comprises an upper end portion located above the cavity 10 and a lower end portion located below the cavity 10, in which embodiment the hydrostatic support system is arranged at the lower end portion of the side cover bushing 2 located below the cavity 10.
As shown in fig. 2, in the working process of the plunger pump, through the axial movement of the variable rod 20 outwards along the cavity 10 of the side cover, hydraulic oil is sucked from the oil inlet 3, flows into the cavity 10 through the first oil outlet 5 connected with the lower end of the first oil inlet channel 4, then flows into the second oil inlet channel 6 through the second oil outlet 7, and flows into the static pressure support system through the second oil inlet channel 6, when the hydraulic oil flows in the static pressure support system, the throttle channel 9 plays a role of fixed damping, after the hydraulic oil enters the throttle channel 9 from the oil outlet channel 8, the oil pressure in the oil outlet channel 8 changes after being damped, and the hydraulic oil after the pressure change is conveyed between the side wall of the cavity 10 and the variable rod 20 to form a stable oil film; the pressing function is achieved when the variable lever 20 moves axially inward along the side cover cavity 10. When the variable rod 20 reciprocates in the cavity 10, the oil film can avoid contact friction between the cavity 10 of the side cover and the variable rod 20, and the abrasion of the side cover is reduced.
A plurality of pressure equalizing grooves 11 are formed in the side wall of the cavity 10, and the pressure equalizing grooves 11 are arranged along the circumferential direction of the cavity 10. When the variable rod 20 reciprocates in the cavity 10 at high frequency in the working state, the equalizing groove 11 can compensate the clamping caused by the unbalanced load under the action of hydraulic pressure caused by machining errors.
The outer side end face of the side cover outer cover 1 is provided with a process hole 13, one end of the process hole 13 is connected with the oil outlet channel 8, and the other end of the process hole 13 is closed by a process plug 12. The process plug 12 of the process hole 13 and the process plug 12 for sealing the first oil inlet duct 4 and the second oil inlet duct 7 are used for ensuring that all the oil ducts are communicated and stabilizing the oil pressure.
The static pressure support side cover further comprises a sealing assembly, the sealing assembly comprises a sealing element 14 (15) and a sealing connecting element 16, the sealing connecting element 16 is in threaded connection with the through hole, and the sealing connecting element 16 can be a threaded structural part such as a stud. The sealing element 14 (15) is installed on the sealing connecting piece 16, the sealing element 14 (15) is arranged in the concave surface 18 and seals the through hole, sealing rings 17 are further arranged between the sealing element 14 (15) and the concave surface 18, the number of the sealing elements 14 (15) is at least 1, and the sealing rings 17 can prevent hydraulic oil from exuding. The hydraulic oil can be prevented from flowing out of the side cover by sealing the through hole of the side cover outer cover 1 by the sealing member 14 (15) and the sealing connecting member 16. The sealing ring 17 is arranged in the concave surface 18 on the outer side end surface of the side cover outer cover 1, so that the sealing ring 17 can be prevented from moving, and the sealing ring 17 is convenient to install.
The number of the sealing elements 14 (15) in the embodiment is 2, and the sealing elements comprise a first sealing element 15 and a second sealing element 14, the first sealing element 15 and the second sealing element 14 are tightly screwed on the sealing connecting element 16 in sequence, and the sealing firmness can be ensured by the 2 sealing elements 14 (15).
The side end face of the side cover outer cover 1 of the embodiment is also provided with a limit screw 19, and the limit screw 19 performs the limit function of axial movement on other parts arranged on the side cover.
According to the plunger pump static pressure support side cover, the oil duct system is arranged on the side cover outer cover 1, the static pressure support system is arranged on the side cover lining 2, the hydraulic oil is connected with the static pressure support system through the oil duct system, hydraulic oil enters the static pressure support system through the oil duct system, an oil film layer is generated on the side wall of the side cover cavity 10, direct contact between the variable rod 20 and the side wall of the cavity 10 is avoided, and excessive abrasion of the inner cavity 10 is prevented from influencing the service life of the side cover.
Example 2
This embodiment only describes differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. The side cover outer cover 1 and the side cover bushing 2 of the present embodiment are formed in a split manner (not shown in the figure), the side cover outer cover 1 is fixedly connected with the housing of the plunger pump, the side cover bushing 2 is pressed by the side cover outer cover 1, the side cover bushing 2 is placed in the housing, and the side cover outer cover 1 and the side cover bushing 2 are mounted in a matched manner.
Example 3:
this embodiment only describes differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. The hydrostatic support system of the present embodiment is provided at an upper end portion (not shown in the drawings) of the side cover bushing 2.
Example 4:
this embodiment only describes differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. The present embodiment provides the static pressure support system arrangement (not shown in the drawings) in both the upper end and the lower end of the side cover bushing 2.
Variations and modifications to the above would be obvious to persons skilled in the art to which the invention pertains from the foregoing description and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not constitute any limitation on the invention.
Claims (7)
1. The novel plunger pump static pressure support side cover comprises a side cover outer cover and a side cover bushing, wherein the side cover bushing is an extending end of the side cover outer cover extending along the inner side end face of the side cover outer cover, a cavity is formed between the side cover bushing and the side cover outer cover along the axial direction of the side cover bushing, and the novel plunger pump static pressure support side cover is characterized in that an oil duct system is arranged on the side cover outer cover, a static pressure support system is arranged on the side cover bushing, and the oil duct system is connected with the static pressure support system;
the oil duct system comprises a first oil duct system and a second oil duct system, wherein the first oil duct system is arranged on the upper half part of the side cover outer cover, and the second oil duct system is arranged on the lower half part of the side cover outer cover;
the static pressure support system comprises an oil outlet channel and a plurality of throttle channels, wherein the oil outlet channel is arranged along the axial direction of the side cover bushing, and one end of the oil outlet channel is connected with the oil channel system; one end of the throttle channel is connected with the oil outlet channel, and the other end of the throttle channel is communicated to the side wall of the cavity;
the first oil duct system comprises an oil inlet and a first oil inlet duct, the oil inlet is connected with the first oil inlet duct, the first oil inlet duct is arranged along the circumferential direction of the side cover outer cover, the lower end of the first oil inlet duct is connected with a first oil outlet, and the first oil outlet is arranged on the bottom wall of the cavity;
the second oil duct system comprises a second oil inlet duct, the second oil inlet duct is arranged along the circumferential direction of the side cover outer cover, the upper end of the second oil inlet duct is connected with a second oil outlet, and the second oil outlet is arranged on the bottom wall of the cavity;
the side wall of the cavity is provided with a plurality of pressure equalizing grooves, and the pressure equalizing grooves are arranged along the circumferential direction of the cavity.
2. The novel hydrostatic support side cover for a plunger pump according to claim 1, wherein the side cover outer cover is provided with a through hole along an axial direction thereof, the through hole penetrates through the side cover outer cover and is connected with the cavity, and an outer side end face of the side cover outer cover in contact with one end of the through hole is provided with a concave surface.
3. The novel hydrostatic support side cover of a plunger pump of claim 1, wherein the upper end of the first oil inlet passage extends to the upper end face of the side cover outer cover.
4. The novel hydrostatic support side cover of a plunger pump of claim 1, wherein the lower end of said second oil inlet passage extends to the lower end face of said side cover outer cover.
5. The novel plunger pump hydrostatic support side cover of claim 2, wherein said hydrostatic support system is disposed at an upper end of said side cover bushing above said cavity; or the static pressure support system is arranged at the lower end part of the side cover bushing below the cavity; or the static pressure support system is arranged at the upper end part and the lower end part of the side cover bushing.
6. The novel plunger pump static pressure support side cover according to claim 1, wherein a process hole is formed in the outer side end face of the side cover outer cover, one end of the process hole is connected with the oil outlet channel, and the other end of the process hole is closed by a process plug.
7. The novel plunger pump hydrostatic support side cover according to claim 2, further comprising a sealing assembly, wherein the sealing assembly comprises sealing elements and sealing connecting elements, the sealing connecting elements are connected with the through holes through threads, the sealing elements are installed on the sealing connecting elements, the sealing elements are arranged in the concave surfaces and seal the through holes, sealing rings are further arranged between the sealing elements and the concave surfaces, and the number of the sealing elements is at least 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711014748.7A CN107642486B (en) | 2017-10-26 | 2017-10-26 | Novel plunger pump static pressure supports side cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711014748.7A CN107642486B (en) | 2017-10-26 | 2017-10-26 | Novel plunger pump static pressure supports side cap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107642486A CN107642486A (en) | 2018-01-30 |
| CN107642486B true CN107642486B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711014748.7A Active CN107642486B (en) | 2017-10-26 | 2017-10-26 | Novel plunger pump static pressure supports side cap |
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| CN (1) | CN107642486B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6436909A (en) * | 1987-07-13 | 1989-02-07 | Sulzer Ag | Reciprocating internal combustion engine with at least one cylinder liner |
| JPH0783015A (en) * | 1993-09-10 | 1995-03-28 | Mitsubishi Heavy Ind Ltd | Piston linkage type lubricator |
| JPH09166074A (en) * | 1995-12-15 | 1997-06-24 | Toshiba Mach Co Ltd | Sawsh plate lubricating structure of swash plate piston type variable displacement pump |
| CN102242700A (en) * | 2011-06-28 | 2011-11-16 | 张坚 | Novel variable oil pump |
| CN104006023A (en) * | 2014-06-06 | 2014-08-27 | 徐州徐工液压件有限公司 | Clearance seal plunger type cylinder |
| CN204610163U (en) * | 2015-04-23 | 2015-09-02 | 宁波恒力液压股份有限公司 | Double steering constant-pressure variable axial piston pump |
| WO2016058457A1 (en) * | 2014-10-15 | 2016-04-21 | 邢宇 | Bushing for cooling dual-side mechanical seal friction pair and centrifugal pump cooling system thereof |
| CN207333172U (en) * | 2017-10-26 | 2018-05-08 | 佛山市科达液压机械有限公司 | A kind of Novel plunger pump static pressure supports side cover |
-
2017
- 2017-10-26 CN CN201711014748.7A patent/CN107642486B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6436909A (en) * | 1987-07-13 | 1989-02-07 | Sulzer Ag | Reciprocating internal combustion engine with at least one cylinder liner |
| JPH0783015A (en) * | 1993-09-10 | 1995-03-28 | Mitsubishi Heavy Ind Ltd | Piston linkage type lubricator |
| JPH09166074A (en) * | 1995-12-15 | 1997-06-24 | Toshiba Mach Co Ltd | Sawsh plate lubricating structure of swash plate piston type variable displacement pump |
| CN102242700A (en) * | 2011-06-28 | 2011-11-16 | 张坚 | Novel variable oil pump |
| CN104006023A (en) * | 2014-06-06 | 2014-08-27 | 徐州徐工液压件有限公司 | Clearance seal plunger type cylinder |
| WO2016058457A1 (en) * | 2014-10-15 | 2016-04-21 | 邢宇 | Bushing for cooling dual-side mechanical seal friction pair and centrifugal pump cooling system thereof |
| CN204610163U (en) * | 2015-04-23 | 2015-09-02 | 宁波恒力液压股份有限公司 | Double steering constant-pressure variable axial piston pump |
| CN207333172U (en) * | 2017-10-26 | 2018-05-08 | 佛山市科达液压机械有限公司 | A kind of Novel plunger pump static pressure supports side cover |
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|---|---|
| CN107642486A (en) | 2018-01-30 |
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