CN220929567U - Swash plate type plunger motor/pump and transmission structure thereof - Google Patents
Swash plate type plunger motor/pump and transmission structure thereof Download PDFInfo
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- CN220929567U CN220929567U CN202322762012.5U CN202322762012U CN220929567U CN 220929567 U CN220929567 U CN 220929567U CN 202322762012 U CN202322762012 U CN 202322762012U CN 220929567 U CN220929567 U CN 220929567U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 78
- 238000007493 shaping process Methods 0.000 claims abstract description 18
- 230000007423 decrease Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 5
- 230000004048 modification Effects 0.000 claims description 14
- 238000012986 modification Methods 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000009966 trimming Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
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- 238000005215 recombination Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The application provides a swash plate type plunger motor/pump and a transmission structure thereof, comprising a transmission shaft and a cylinder body, wherein an external spline of the transmission shaft is in transmission fit with an internal spline of the cylinder body, and the internal spline or a key tooth of the external spline comprises: a drum-shaped part, the thickness of which gradually decreases from the middle part to the end part; the thickness of the shaping part gradually decreases along the direction away from the drum-shaped part, and the thickness gradual change degree of the shaping part is larger than that of the drum-shaped part. The key teeth are formed in a mode of combining the drum-shaped part and the shaping part, so that the leakage problem between the cylinder body and the valve plate can be solved, and the transmission shaft has better structural strength and service life.
Description
Technical Field
The application relates to the technical field of hydraulic devices, in particular to a swash plate type plunger motor/pump and a transmission structure thereof.
Background
The swash plate type plunger motor is a hydraulic device for converting hydraulic energy into mechanical energy, and the swash plate type plunger pump is a hydraulic device for converting mechanical energy into hydraulic energy, and the two hydraulic devices are opposite in working principle and similar in structure. In this case, a swash plate type plunger motor is taken as an example, the swash plate type plunger motor is provided with a transmission shaft, a valve plate, a cylinder body and a swash plate, the valve plate and the swash plate are fixed, the transmission shaft is connected with the cylinder body to rotate together, when pressure oil enters a plunger hole of the cylinder body through a window of the valve plate, the plunger is stretched out under the action of the pressure oil and clings to the swash plate, and the cylinder body and the transmission shaft rotate relative to the valve plate and the swash plate under the action of the swash plate. But in the course of the work, can apply to a radial force of transmission shaft after the cylinder block receives the reaction force of sloping cam plate for the transmission shaft produces the deflection deformation and crooked, because adopt the side face contact structure between the external spline of transmission shaft and the internal spline of cylinder block, the transmission shaft crooked can drive the cylinder block and incline for the valve plate, makes to produce between cylinder block and the valve plate and reveal. In particular to a compact product, the transmission shaft is thinner, the displacement is large, the deflection deformation of the transmission shaft is larger at low speed, and the leakage is higher.
Disclosure of utility model
In view of the above, the present application provides a swash plate type plunger motor/pump and a transmission structure thereof, which can solve the problem of cylinder leakage caused by deflection deformation of a transmission shaft.
In order to achieve the above purpose, the present application provides the following technical solutions:
A drive structure for a swash plate type plunger motor/pump, comprising a drive shaft and a cylinder block, an external spline of the drive shaft is in drive engagement with an internal spline of the cylinder block, and the internal spline or a spline tooth of the external spline comprises:
A drum-shaped part, the thickness of which gradually decreases from the middle part to the end part;
The thickness of the shaping part gradually decreases along the direction away from the drum-shaped part, and the thickness gradual change degree of the shaping part is larger than that of the drum-shaped part.
Optionally, the modified part comprises a spherical hinge in transmission fit with the external spline, and the modified part is only arranged at one end of the drum-shaped part far away from the spherical hinge.
Optionally, the side surface of the drum-shaped part is provided with an arc-shaped surface.
Optionally, the radius of the arc surface is set to 3000-5000 mm.
Optionally, the radius of the arc surface is 3500-4500 mm.
Optionally, the side surface of the shaping portion is provided as a plane.
Optionally, the length of the shaping portion is set to 2.5-4.5 mm.
Optionally, the thickness difference of the shaping part is set to be 0.06-0.12 mm.
Optionally, the end face of the key tooth in the length direction is a curved surface smoothly transiting with the outer circumferential surface of the main body of the transmission shaft.
A swash plate type plunger motor/pump comprising a transmission arrangement as claimed in any one of the preceding claims.
According to the transmission structure provided by the application, through the design of the drum-shaped part and the shaping part, the contact form between the external spline of the transmission shaft and the internal spline of the cylinder body is changed from surface contact to line contact, and the contact degree between the transmission shaft and the cylinder body is reduced, so that the cylinder body has a certain floating amount in the radial direction of the transmission shaft, the floating amount can compensate the deflection deformation amount of the transmission shaft, the inclination amount of the cylinder body relative to the valve plate due to the deflection deformation of the transmission shaft can be reduced, the fit between the cylinder body and the valve plate is improved, and leakage between the cylinder body and the valve plate is effectively reduced. And through the mode that drum type portion and repair type portion combined together, for the spline that sets up drum type portion or repair type portion alone, can make the bulge degree of drum type portion lower, repair type portion is less for the length occupation ratio of whole spline, under the same circumstances that keeps the leakage quantity of cylinder body certain, is favorable to making the transmission shaft have better structural strength and life.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of a swash plate type plunger motor or a swash plate type hydraulic pump shown in some embodiments;
FIG. 2 is a front view of a drive shaft shown in some embodiments;
fig. 3 is an enlarged view of the position a in fig. 2.
In the figure: 1. a transmission shaft; 2. a port plate; 3. a cylinder; 4. spherical hinge; 5. a swash plate; 11. a drum portion; 12. and a shaping part.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1 to 3, an embodiment of the present application provides a transmission structure for a swash plate type hydraulic motor or a swash plate type hydraulic pump, which includes a transmission shaft 1 and a cylinder block 3, and external splines of the transmission shaft 1 are in transmission engagement with internal splines of the cylinder block 3 so that the transmission shaft 1 and the cylinder block 3 can be rotated synchronously. In the working process, when the pressure oil enters the plunger hole of the cylinder body 3 through the window of the valve plate 2, the plunger extends outwards under the action of the pressure oil and clings to the swash plate 5, the swash plate 5 generates a normal counterforce to the plunger, the force can be decomposed into an axial component force and a vertical component force, the axial component force balances with the hydraulic pressure on the plunger, the vertical component force enables the plunger to generate a torque to the center of the cylinder body 3, and the cylinder body 3 and the transmission shaft 1 rotate relative to the swash plate 5 and the valve plate 2. Correspondingly, the working process of the swash plate hydraulic pump is to enable the plunger to stretch and retract in the plunger hole through the rotation of the cylinder body 3 and the transmission shaft 1 relative to the swash plate 5 and the valve plate 2, so that oil in the plunger hole generates pressure and flows through the valve plate 2.
The key teeth of one of the external spline of the drive shaft 1 and the internal spline of the cylinder 3 include the drum-shaped portion 11 and the modified portion 12, and the key teeth of the corresponding other one are not modified, and it is preferable that the key teeth of the external spline of the drive shaft 1 include the drum-shaped portion 11 and the modified portion 12 for easy machining. The following description will take, as an example, a case where the external spline teeth of the propeller shaft 1 have a drum-shaped portion 11 and a modified portion 12.
The side of drum type portion 11 (can be a side, also can be two opposite sides) protrusion setting to make in the length direction of key tooth, drum type portion 11 thickness reduces gradually from the middle part to the tip, when cylinder body 3 and transmission shaft 1 pass through the spline cooperation, because the protrusion setting in the side middle part of drum type portion 11, make the contact form between the external spline of transmission shaft 1 and the internal spline of cylinder body 3 become the line contact by the face contact, through transmission shaft 1 and the contact degree of cylinder body 3 reduction, make cylinder body 3 have certain floating amount in the radial of transmission shaft 1, this floating amount can compensate the deflection deformation volume of transmission shaft 1, and then can reduce the cylinder body and be relative to the tilting volume of valve plate because of the deflection deformation of transmission shaft, improve the laminating of cylinder body and valve plate, effectively prevent producing the leakage between cylinder body 3 and the valve plate 2.
It should be noted that the thickness of the drum-shaped portion 11 may be gradually reduced from the middle to the two ends, or from the middle to one end (the end near the port plate 2 on the drum-shaped portion 11), so that the contact degree of the key teeth between the transmission shaft 1 and the cylinder 3 may be reduced, and the cylinder 3 may be prevented from tilting relative to the port plate 2 due to deflection deformation of the transmission shaft 1 to some extent.
Further, the trimming portion 12 is provided at the end of the drum portion 11, the thickness of the trimming portion 12 gradually decreases in a direction away from the drum portion 11, and the thickness gradient of the trimming portion 12 is greater than that of the drum portion 11. In the process of machining the key teeth, the entire key teeth may be machined into the drum-shaped portion 11, and then a trimming process (such as machining an arc chamfer or a bevel chamfer) may be performed at the intersection position of the side surface and the end surface of the drum-shaped portion 11, so that the thickness of the intersection position is gradually reduced, and a trimming portion 12 is formed at the end portion of the drum-shaped portion 11. Through the design of the shaping part 12, when the deflection deformation of the transmission shaft 1 is carried out, the effective contact area between the transmission shaft 1 and the cylinder body 3 can be reduced, and further the influence of the deflection deformation of the transmission shaft 1 on the leakage of the cylinder body 3 is reduced.
Although the solution of providing the drum-shaped portion 11 or the trimming portion 12 on the spline alone can solve the problem of leakage of the cylinder 3, when the drum-shaped portion 11 is provided alone while keeping the amount of leakage of the cylinder 3 constant, the protruding degree of the drum-shaped portion 11 needs to be made large, and the structural strength of the transmission shaft 1 is weakened, and the service life is reduced; when the modified portion 12 is provided alone, the modified portion 12 needs to occupy a relatively large length relative to the entire spline, and the structural strength of the drive shaft 1 is weakened, resulting in a reduction in the service life. In this scheme, through the mode that drum type portion 11 and the portion of repairing type 12 combined, can make the bulge degree of drum type portion 11 lower, repair type portion 12 is less for whole spline's length occupation ratio, under the same circumstances that keeps the leakage quantity of cylinder body 3 certain, is favorable to making transmission shaft 1 have better structural strength and life.
By means of the arrangement, key teeth are formed through the mode that the drum-shaped part 11 and the shaping part 12 are combined, the leakage problem between the cylinder body 3 and the valve plate 2 can be solved, and the transmission shaft 1 has good structural strength and service life.
In this embodiment, in the length direction of the key teeth, the trimming portion 12 is disposed at one end or both ends of the drum portion 11, that is, the trimming portion 12 may be disposed one or two. Here, it is preferable that the modification portion 12 is provided with one, wherein the transmission structure includes a spherical hinge 4, the spherical hinge 4 is sleeved on the periphery of the transmission shaft 1 and is in transmission fit with an external spline of the transmission shaft 1, that is, the external spline of the transmission shaft 1 is in transmission fit with the cylinder 3 and the spherical hinge 4 at the same time, a key tooth of the external spline of the transmission shaft 1 has a first end close to the cylinder 3 and a second end close to the spherical hinge 4, and the modification portion 12 is only provided at the first end of the drum portion 11 away from the spherical hinge 4, so that the modification portion 12 is not provided at the end of the drum portion 11 close to the spherical hinge 4, thereby simplifying the processing steps of the modification portion 12, saving the cost, and simultaneously, since the modification portion 12 is designed to have an influence on the flexural strength of the transmission shaft 1, only the first end of the drum portion 11 away from the spherical hinge 4 is provided with the modification portion 12, not only the strength of the transmission shaft 1, but also not having an influence on the oblique leakage of the cylinder 3 (only the second end of the drum portion 11 is matched with the spherical hinge 4, and no influence on the cylinder 3 is provided).
In some embodiments, the sides of the drum 11 are configured as arcuate surfaces, and since the key teeth have two opposite sides, the drum 11 also has two opposite sides, and the arcuate surfaces formed by the two sides of the drum 11 are configured as mirror images to ensure the stability of the spline fit. Here, by setting the side surface of the drum-shaped portion 11 to an arcuate surface, the degree of protrusion of the side surface of the drum-shaped portion 11 can be smoothed, and further spline fit formed between the drive shaft 1 and the cylinder 3 can be stabilized.
It will be appreciated that the thickness of the key teeth becomes gradually greater in a direction approaching the central axis of the drive shaft 1, and correspondingly, the arcuate surface formed by the side surface of the drum 11 may also correspond to the degree of gradual change.
The radius R of the arcuate surface of the drum-shaped portion 11 is set to 3000-5000 mm, preferably 3500-4500 mm, for example, the radius of the arcuate surface of the drum-shaped portion 11 is set to 4000 mm, so that the protruding degree (gradual change degree of thickness of the drum-shaped portion) of the arcuate surface can be made smaller by making the radius of the arcuate surface larger, and the leakage problem of the cylinder 3 can be solved while ensuring the structural strength and the service life of the drive shaft 1.
The side surface of the shaping portion 12 is provided as a plane so as to facilitate shaping processing of the shaping portion 12, which is advantageous in saving cost. Of course, the side surface of the modified portion 12 may be provided as an arc surface.
Wherein the length a of the modification 12 is set to 2.5-4.5 mm, for example, 3mm or 4 mm. Thus, by limiting the length of the modification portion 12, the modification portion 12 can occupy a relatively small length relative to the whole key teeth, so that the leakage problem of the cylinder body 3 is solved while the structural strength and the service life of the transmission shaft 1 are ensured.
The thickness difference B of the modified portion 12 is set to be 0.06-0.12 mm, wherein the end, close to the drum portion 11, of the modified portion 12 has a maximum thickness, the end, far away from the drum portion 11, of the modified portion 12 has a minimum thickness, and the thickness difference is a difference between the maximum thickness and the minimum thickness, so that the thickness difference of the modified portion 12 is limited, the thinning degree of the modified portion 12 can be limited, and the influence of the design of the modified portion 12 on the service life of the transmission shaft 1 is avoided.
In some embodiments, the end face of the key tooth in the length direction is set to be a curved surface, and the curved surface is in smooth transition with the outer circumferential surface of the main body of the transmission shaft 1, so that the key tooth and the main body of the transmission shaft 1 have stronger structural stability through the design of the curved surface, and the stability of the key tooth during deflection deformation of the transmission shaft 1 is ensured.
The length direction of the key teeth, the drum-shaped portion 11, and the modified portion 12 herein is a dimension in the axial direction of the propeller shaft 1, the length of the key teeth, the drum-shaped portion 11, and the modified portion 12 is a distance between opposite ends in the axial direction of the propeller shaft 1, the thickness of the key teeth, the drum-shaped portion 11, and the modified portion 12 is a distance between opposite sides in the circumferential direction of the propeller shaft 1, and the height of the key teeth, the drum-shaped portion 11, and the modified portion 12 is a distance formed between the center axis of the propeller shaft 1.
The embodiment of the application provides a swash plate type plunger motor and a swash plate type plunger pump, which comprise a transmission mechanism in the embodiment, and the transmission mechanism is arranged in such a way that key teeth are formed by combining a drum-shaped part 11 and a shaping part 12, so that the leakage problem between a cylinder body 3 and a valve plate 2 can be solved, and the transmission shaft 1 has better structural strength and service life.
The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It should be understood that the terms "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are used for more clearly describing the technical solutions, and are not intended to limit the scope of the present application.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (10)
1. A drive structure for a swash plate type plunger motor/pump, comprising a drive shaft and a cylinder block, wherein an external spline of the drive shaft is in drive engagement with an internal spline of the cylinder block, and the internal spline or a spline tooth of the external spline comprises:
A drum-shaped part, the thickness of which gradually decreases from the middle part to the end part;
The thickness of the shaping part gradually decreases along the direction away from the drum-shaped part, and the thickness gradual change degree of the shaping part is larger than that of the drum-shaped part.
2. The transmission structure according to claim 1, comprising a spherical hinge in driving engagement with the external spline, the modification being provided only at an end of the drum-shaped portion remote from the spherical hinge.
3. The transmission structure according to claim 1, wherein a side surface of the drum portion is provided as an arcuate surface.
4. A transmission according to claim 3, wherein the radius of the arcuate surface is set to 3000-5000 mm.
5. A transmission according to claim 3, wherein the radius of the arcuate surface is set to 3500-4500 mm.
6. The transmission structure according to claim 1, wherein the side surface of the modification is provided as a plane.
7. The transmission structure according to claim 1, wherein the length of the modification is set to 2.5-4.5 mm.
8. The transmission structure according to claim 1, wherein the thickness difference of the modified portion is set to 0.06-0.12 mm.
9. The transmission structure according to claim 1, wherein an end face of the key tooth in the longitudinal direction is provided as a curved surface smoothly transiting with an outer peripheral surface of a main body of the transmission shaft.
10. A swash plate type plunger motor/pump comprising a transmission structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322762012.5U CN220929567U (en) | 2023-10-13 | 2023-10-13 | Swash plate type plunger motor/pump and transmission structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322762012.5U CN220929567U (en) | 2023-10-13 | 2023-10-13 | Swash plate type plunger motor/pump and transmission structure thereof |
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| Publication Number | Publication Date |
|---|---|
| CN220929567U true CN220929567U (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322762012.5U Active CN220929567U (en) | 2023-10-13 | 2023-10-13 | Swash plate type plunger motor/pump and transmission structure thereof |
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| Country | Link |
|---|---|
| CN (1) | CN220929567U (en) |
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2023
- 2023-10-13 CN CN202322762012.5U patent/CN220929567U/en active Active
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