CN216518440U - Pretightening mechanism of oblique shaft type plunger pump/motor - Google Patents
Pretightening mechanism of oblique shaft type plunger pump/motor Download PDFInfo
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- CN216518440U CN216518440U CN202123198239.9U CN202123198239U CN216518440U CN 216518440 U CN216518440 U CN 216518440U CN 202123198239 U CN202123198239 U CN 202123198239U CN 216518440 U CN216518440 U CN 216518440U
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Abstract
The utility model discloses a pre-tightening mechanism of an inclined shaft type plunger pump/motor, which comprises a cylinder body and an oil distribution disc which is in close fit with the cylinder body, wherein a pre-tightening spring and an adjusting gasket are arranged in a central plunger hole of the cylinder body, a central sleeve which is used for compressing the pre-tightening spring and applying pre-tightening force to the cylinder body through the adjusting gasket is slidably arranged in the central plunger hole, an adjusting screw which is used for driving the central sleeve to compress the pre-tightening spring is positioned in the central sleeve in a penetrating way, the pre-tightening spring and the adjusting gasket are sleeved on the adjusting screw, the pre-tightening spring is positioned in the central sleeve, a gap of 0.15mm-0.25mm is kept between the front annular end surface of the central sleeve and the adjusting gasket, and the front end of the adjusting screw penetrates through the cylinder body and the oil distribution disc in a non-contact way and extends to a rear cover of the plunger pump/motor. The utility model has the advantages of simple structure, easy processing, low production cost and convenient adjustment of pretightening force and clearance.
Description
Technical Field
The utility model relates to a manufacturing technology of a hydraulic pump/motor, in particular to a pre-tightening mechanism of an inclined shaft type plunger pump/motor.
Background
In the operation process of the inclined shaft type plunger pump/motor, the cylinder body needs to have certain pretightening force so that the cylinder body can be tightly attached to an oil distribution disc to finish oil distribution. The pretightning force needs be in certain within range, if the pretightning force undersize, high-pressure oil can push away and join in marriage the problem that the food tray caused the leakage, if the pretightning force is too big, can cause excessive wearing and tearing because of the friction increase between cylinder body and the food tray. The current mainstream pre-tightening mechanism on the market is a central plunger type, in the mechanism, the pre-tightening force of a cylinder body is provided by a pre-tightening spring, and the compression amount of the pre-tightening spring determines the size of the pre-tightening force. The central plunger is actually arranged on the main shaft and inside the shell, and the position of the central plunger is fixed, so that a special tool is needed to be used for measuring the distance from the central plunger to the bottom of the plunger hole in the assembling process, and an appropriate adjusting gasket is selected to ensure the compression length of the pre-tightening spring. In order to prevent cylinder release, a certain gap should be kept between the adjusting gasket and the bottom of the central plunger. However, the pre-tightening mechanism is very difficult to adjust the pre-tightening force and the clearance after assembly, and is very difficult and inconvenient to operate.
Disclosure of Invention
The utility model aims to solve the technical problem of the prior art and provides a pre-tightening mechanism of an inclined shaft type plunger pump/motor, which has a simple structure and a reasonable design and can easily adjust the pre-tightening force of a cylinder body without replacing a gasket.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a pre-tightening mechanism of an inclined shaft type plunger pump/motor comprises a cylinder body and an oil distribution disc which is in close fit with the cylinder body, wherein a pre-tightening spring and an adjusting gasket are arranged in a central plunger hole of the cylinder body, a central sleeve which is used for compressing the pre-tightening spring and applying pre-tightening force to the cylinder body through the adjusting gasket is slidably arranged in the central plunger hole, an adjusting screw which is used for driving the central sleeve to compress the pre-tightening spring is positioned in the central sleeve in a penetrating mode, the pre-tightening spring and the adjusting gasket are sleeved on the adjusting screw, the pre-tightening spring is located in the central sleeve, a gap of 0.15mm-0.25mm is kept between the front annular end face of the central sleeve and the adjusting gasket, and the front end of the adjusting screw penetrates through the cylinder body and the oil distribution disc in a non-contact mode and extends to a rear cover of the plunger pump/motor.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the rear end of the adjusting screw is formed with an expanding head body for driving the central sleeve, and the rear end of the central sleeve is formed with a positioning concave cavity matched with the expanding head body in a positioning sleeved mode.
The front end of the pre-tightening spring is abutted against the rear end face of the adjusting gasket, the tail end of the pre-tightening spring is abutted against an annular step face in the central sleeve, and the front end face of the adjusting gasket is abutted against a positioning step face of the central plunger hole.
Compared with the prior art, the plunger pump/motor adjusting device is additionally provided with the central sleeve and the adjusting screw rod, and the adjusting screw rod extends to the rear cover of the plunger pump/motor, so that the pre-tightening force of the pre-tightening spring and the adjustment of the gap are more convenient. Particularly, the central sleeve is adopted to replace the traditional central plunger, the central sleeve is more convenient to process relative to the central plunger, and a central ball socket connected with the central plunger does not need to be processed at the position of a main shaft of the plunger pump/motor, so that the processing time of a product can be effectively reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at I;
FIG. 3 is a cross-sectional view of the core sleeve of the present invention;
FIG. 4 is a cross-sectional structural view of the cylinder block of the present invention;
fig. 5 is a schematic diagram of a pretensioning mechanism in the prior art.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Fig. 1 to 4 are schematic structural views of the present invention, and fig. 5 is a schematic structural view of a mainstream pretensioning mechanism in the market at present.
Wherein the reference numerals are: the oil distribution device comprises a gap S, a cylinder body 1, a central column plug hole 1a, a positioning step surface 1b, a pre-tightening spring 2, an adjusting gasket 3, a central sleeve 4, a positioning concave cavity 4a, an annular step surface 4b, a front annular end surface 41, an adjusting screw rod 5, an expanding head body 51, an oil distribution disc 6, a rear cover 7 and a central plunger 8.
In the prior art, the oblique axis type plunger pump/motor mainly comprises a shell, a rear cover, a main shaft, a soling ring plunger, a central plunger, a cylinder body, an oil distribution disc, some standard parts and other parts, wherein the main stream of a pre-tightening mechanism is a central plunger type, and the structure of the pre-tightening mechanism is shown in fig. 5. In the mechanism, the pre-tightening force of the cylinder body 1 is provided by the pre-tightening spring 2, and the compression amount of the pre-tightening spring 2 determines the magnitude of the pre-tightening force. The ball head of the central plunger 8 is actually arranged on the main shaft and inside the shell, and the position of the ball head is fixed, so that a special tool needs to be used for measuring the distance from the central plunger to the bottom of the plunger hole in the assembling process, and then a proper adjusting gasket 3 is selected for ensuring the compression length of the pre-tightening spring 2, namely the pre-tightening force of the cylinder body 1 is ensured. In order to prevent cylinder release, a certain gap is usually kept between the adjusting gasket 3 and the bottom of the central plunger 8, and the gap and the pretightening force are adjusted by replacing different gaskets in the structure, so that the operation is very troublesome.
As shown in figures 1 to 4, the utility model discloses a pre-tightening mechanism of an inclined shaft type plunger pump/motor, which comprises a cylinder body 1 with a central plunger hole 1a and an oil distribution disc 6 in close fit with the cylinder body 1, wherein a pre-tightening spring 2 and an adjusting gasket 3 are arranged in the central column 1a of the cylinder body 1. The utility model is characterized in that: a central sleeve 4 for compressing the pre-tightening spring 2 is further slidably arranged in the central column plug hole 1a so as to apply pre-tightening force to the cylinder body 1 through an adjusting gasket 3, an adjusting screw rod 5 for driving the central sleeve 4 to compress the pre-tightening spring 2 is positioned and penetrated in the central sleeve 4, and the force of the central sleeve 4 for compressing the pre-tightening spring 2 is obtained by unscrewing or screwing the adjusting screw rod 5. As can be seen from fig. 1, the adjusting shim 3 is arranged at the front end of the center sleeve 4, and in order to prevent cylinder release, a gap S of 0.15mm to 0.25mm is maintained between the front annular end surface 41 of the center sleeve 4 and the adjusting shim 3, as shown in fig. 2. The adjusting gasket 3 is matched with the central sleeve 4 to press the pre-tightening spring 2 in the sleeve hole of the central sleeve 4. The front end of the adjusting screw 5 passes through the pre-tightening spring 2 and the adjusting gasket 3 in sequence and then passes through the cylinder body 1 and the oil distribution disc 6 in a non-contact manner to extend to the rear cover 7 of the plunger pump/motor.
In the embodiment shown in fig. 3, an enlarged head body 51 for driving the central sleeve 4 is formed at the rear end of the adjusting screw 5 of the present invention, and a positioning concave cavity 4a fitted with the enlarged head body 51 is formed at the rear end of the central sleeve 4.
In the embodiment, the front end of the pre-tightening spring 2 abuts against the rear end face of the adjusting gasket 3, the tail end of the pre-tightening spring 2 abuts against an annular step face 4b in the central sleeve 4, and the front end face of the adjusting gasket 3 abuts against a positioning step face 1b of the central plunger hole 1 a.
Compared with a central plunger type, the pre-tightening mechanism of the utility model is additionally provided with a central sleeve 4 and an adjusting screw rod 5, and a central plunger 8 is reduced. The central sleeve 4 is easier to machine than the central plunger 8, and in particular the central sleeve 4 is not connected to the spindle of the plunger pump/motor, so that no central ball socket needs to be machined on the spindle using the pretensioning mechanism. The adjusting screw 5 can be made of standard parts, so that the processing time of the product can be reduced.
In the aspect of adjusting the pretightening force and the gap, the pretightening mechanism can be directly adjusted on the rear cover 7, the adjusting screw 5 is screwed to the bottom and then unscrewed, and the displacement distance S = P multiplied by theta/360 of the adjusting screw 5.
Wherein: p is the pitch and theta is the rotation angle. Therefore, the utility model does not need to change the gap S by replacing the adjusting gasket 3, and the adjustment is very convenient.
While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the utility model.
Claims (3)
1. The utility model provides a pretension mechanism of bent axis formula plunger pump/motor, includes cylinder body (1) and with this cylinder body (1) hug closely the food tray (6) of cooperation, be equipped with pretension spring (2) and adjusting shim (3) in the central plunger hole (1a) of cylinder body (1), characterized by: the center plunger hole (1a) is internally provided with a center sleeve (4) which is used for compressing a pre-tightening spring (2) and applying pre-tightening force to the cylinder body (1) through an adjusting gasket (3) in a sliding way, an adjusting screw rod (5) which is used for driving the center sleeve (4) to compress the pre-tightening spring (2) is positioned in the center sleeve (4) in a penetrating way, the pre-tightening spring (2) and the adjusting gasket (3) are sleeved on the adjusting screw rod (5), the pre-tightening spring (2) is positioned in the center sleeve (4), a gap (S) of 0.15mm-0.25mm is kept between the front annular end surface (41) of the center sleeve (4) and the adjusting gasket (3), and the front end of the adjusting screw rod (5) penetrates through the cylinder body (1) and the oil distribution disc (6) in a non-contact way and extends to a rear cover (7) of the plunger pump/motor.
2. The pretensioning mechanism for a bent-axis plunger pump/motor according to claim 1, wherein: the rear end of the adjusting screw rod (5) is formed with an expanding head body (51) for driving the central sleeve (4), and the rear end of the central sleeve (4) is formed with a positioning concave cavity (4a) matched with the expanding head body (51) in a positioning sleeved mode.
3. The pretensioning mechanism for a bent-axis plunger pump/motor as claimed in claim 2, wherein: the front end of the pre-tightening spring (2) is abutted against the rear end face of the adjusting gasket (3), the tail end of the pre-tightening spring (2) is abutted against an annular step face (4b) in the central sleeve (4), and the front end face of the adjusting gasket (3) is abutted against a positioning step face (1b) of the central plunger hole (1 a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123198239.9U CN216518440U (en) | 2021-12-20 | 2021-12-20 | Pretightening mechanism of oblique shaft type plunger pump/motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123198239.9U CN216518440U (en) | 2021-12-20 | 2021-12-20 | Pretightening mechanism of oblique shaft type plunger pump/motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216518440U true CN216518440U (en) | 2022-05-13 |
Family
ID=81499616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123198239.9U Active CN216518440U (en) | 2021-12-20 | 2021-12-20 | Pretightening mechanism of oblique shaft type plunger pump/motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216518440U (en) |
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2021
- 2021-12-20 CN CN202123198239.9U patent/CN216518440U/en active Active
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