Variable plunger pump cylinder body spring press-fitting tool

Abstract

This utility model discloses a variable displacement piston pump cylinder spring press-fitting fixture, relating to the field of variable displacement piston pump technology. It includes a base with a positioning structure for mounting and positioning the cylinder of the variable displacement piston pump; a press-fitting rod located on the side of the cylinder with a spring mounting hole; the press-fitting rod coaxially extends into the spring mounting hole and abuts against the end face of the cylinder spring; the end of the press-fitting rod extending into the spring mounting hole has a cross-sectional structure smaller than the inner ring structure of the spring retainer; and a press for driving the press-fitting rod to move along the axial direction of the spring mounting hole. This improves assembly efficiency, ensures the spring can be quickly and stably press-fitted to the required position, is easy to operate, and reduces the labor intensity of workers.

Description

Technical Field

[0001] This utility model relates to the field of variable displacement piston pump technology, and in particular to a variable displacement piston pump cylinder spring press-fitting tool. Background Technology

[0002] The cylinder block of a variable displacement piston pump requires the installation of a cylinder block spring, a retaining ring for the bore, and two spring washers during the press-fitting process. This process involves many steps, is quite complicated, takes a long time, and improper installation can easily damage the cylinder block, leading to other quality problems and affecting the assembly quality of the components. Utility Model Content

[0003] The purpose of this invention is to provide a spring pressing fixture for a variable displacement piston pump cylinder body, which solves the problems existing in the prior art, improves assembly efficiency, ensures that the spring can be pressed into the required position quickly and stably, is easy to operate, and reduces the labor intensity of workers.

[0004] To achieve the above objectives, this utility model provides the following solution: This utility model provides a variable displacement piston pump cylinder block spring press-fitting fixture, comprising:

[0005] The base has a positioning structure for mounting and positioning the cylinder of the variable piston pump;

[0006] A press-fit rod is located on the side of the cylinder body where the spring mounting hole is provided; the press-fit rod is used to coaxially extend into the spring mounting hole and abut against the end face of the cylinder body spring; the end of the press-fit rod extending into the spring mounting hole has a cross-sectional structure smaller than the inner ring structure of the spring retainer ring;

[0007] A press is used to drive the press rod to move along the axial direction of the spring mounting hole.

[0008] Optionally, the end of the press-fit rod that extends into the spring mounting hole is a stepped press-fit structure; the stepped press-fit structure includes:

[0009] The insertion part is coaxially inserted into the inner side of the end of the cylinder spring;

[0010] The annular stepped portion is coaxially wrapped around the outer periphery of the insertion portion and fitted into the inner periphery of the cylinder spring end.

[0011] Optionally, the press rod further includes:

[0012] A reduced-diameter section is coaxially connected to the side of the stepped press-fit structure away from the cylinder spring; the cross-sectional structure of the reduced-diameter section is smaller than that of the stepped press-fit structure; there is a clearance interval between the reduced-diameter section and the inner wall of the spring mounting hole, the clearance interval being used to allow the spring retaining ring to be installed in the spring mounting hole.

[0013] Optionally, the cylinder spring has a spring washer with an annular structure at the end that contacts the press rod, and the annular stepped portion is fitted into the inner periphery of the spring washer.

[0014] Optionally, the pressing rod is equipped with a pressing seat, which is located on the side of the cylinder body with a spring mounting hole and has a gap between it and the base to accommodate the cylinder body. The end of the pressing rod that does not abut against the cylinder body spring is detachably connected to the pressing seat.

[0015] Optionally, the press-fitting seat is provided with a first positioning through hole coaxial with the cylinder spring;

[0016] The press rod includes a positioning section coaxially fitted into the first positioning through hole. The positioning section is connected to a limiting plate, which abuts against the side surface of the press seat away from the base and is detachably connected to the press seat.

[0017] Optionally, the press is located on the side of the limiting plate opposite to the pressing seat, and the output end of the press is used to abut against the limiting plate.

[0018] Optionally, a plurality of elastic reset elements are connected between the press-fit seat and the base. Each elastic reset element is equally spaced around the outer periphery of the cylinder spring axis, and the extension and retraction direction of the elastic reset element is set in the same direction as the extension and retraction direction of the cylinder spring.

[0019] Optionally, the elastic reset element includes, but is not limited to, a reset spring and a gas spring.

[0020] Optionally, the positioning structure is a second positioning through hole opened on the base, the spline connection of the cylinder body is coaxially fitted into the second positioning through hole, and the main body of the cylinder body abuts against the side of the base near the press rod.

[0021] The present invention achieves the following technical advantages over the prior art:

[0022] This utility model discloses a variable displacement piston pump cylinder spring press-fit fixture. When installing the cylinder spring, the cylinder is mounted on the positioning structure of the base, and the cylinder spring is set through the spring mounting hole. Then, a press drives a press rod, which extends into the spring mounting seat and overcomes the elastic force of the cylinder spring to compress it. After the cylinder spring is compressed, the pressing stops. A spring retaining ring is then installed into the spring mounting hole. The press is then reset, and the press rod is removed from the spring mounting hole, completing the press-fit process. Since the press rod no longer limits the cylinder spring, it rebounds, and its end abuts against the spring retaining ring. Finally, the cylinder is removed from the positioning structure of the base. Therefore, the variable piston pump cylinder spring press-fitting fixture disclosed in this utility model utilizes a press-fitting rod to compress the cylinder spring, eliminating the need for manual labor, thus improving assembly efficiency. It ensures that the cylinder spring can be quickly and stably pressed into the required position, is easy to operate, reduces the labor intensity of workers, and avoids the defects caused by manual compression of the cylinder spring, which leads to long installation time and damage to the cylinder due to improper installation, resulting in other quality problems and affecting the assembly quality of the components. Moreover, the variable piston pump cylinder spring press-fitting fixture disclosed in this utility model has a simple, compact, and reasonable structure, which significantly reduces manufacturing costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the variable piston pump cylinder body spring press-fitting tool before press-fitting in an example disclosed in this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the variable piston pump cylinder spring press-fit tool during press-fitting in one example disclosed in this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of a variable piston pump cylinder body spring press-fitting tool after press-fitting in one example disclosed in this utility model;

[0027] Figure 4 This is a schematic diagram of the overall structure of the press rod in one example disclosed in this utility model;

[0028] Among them, 1-press, 2-press base, 3-elastic reset element, 4-base, 5-press rod, 6-limiting plate, 7-positioning section, 8-reduced diameter section, 9-insertion part, 10-annular step part, 11-first positioning through hole, 12-cylinder body, 13-second positioning through hole, 14-spring washer, 15-cylinder body spring, 16-spring retaining ring, 17-spring mounting hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] The purpose of this invention is to provide a spring pressing fixture for a variable displacement piston pump cylinder body, which solves the problems existing in the prior art, improves assembly efficiency, ensures that the spring can be pressed into the required position quickly and stably, is easy to operate, and reduces the labor intensity of workers.

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 4 As shown, this utility model provides a variable displacement piston pump cylinder spring press-fitting fixture, including a base 4, a press rod 5, and a press 1; the base 4 is provided with a positioning structure, which is used to install and position the cylinder 12 of the variable displacement piston pump, thereby playing a role in centering and fixing the cylinder 12. It should be noted that the base 4 is fixedly installed on the ground or on the frame so that when the press rod 5 moves against the cylinder spring 15, the base 4 and the cylinder 12 can remain fixed, so that the press rod 5 can stably push the cylinder spring 15.

[0033] The press rod 5 is located on the side of the cylinder body 12 where the spring mounting hole 17 is opened; the press rod 5 is used to coaxially extend into the spring mounting hole 17 and abut against the end face of the cylinder body spring 15; the end of the press rod 5 extending into the spring mounting hole 17 has a cross-sectional structure smaller than the inner ring structure of the spring retaining ring 16, so that after press-fitting, the press rod 5 is not restricted by the spring retaining ring 16, and can then be moved out of the spring mounting hole 17; the press 1 is used to drive the press rod 5 to move along the axial direction of the spring mounting hole 17.

[0034] In this embodiment, the output end of the press 1 can be detachably connected to the pressing rod 5, thereby limiting the output end of the press 1 to move along the axial direction of the cylinder spring 15, thereby pushing the pressing rod 5 to move along the axial direction of the cylinder spring 15; or the pressing rod 5 can be movably mounted on the frame, so that it can move along the axial direction of the cylinder spring 15, thereby causing the output end of the press 1 to abut against the end of the pressing rod 5 away from the cylinder spring 15, driving the pressing rod 5 to move, and realizing the compression of the cylinder spring 15.

[0035] The variable displacement piston pump cylinder spring 15 press-fit fixture disclosed in this utility model involves installing the cylinder spring 15 by mounting the cylinder 12 on the positioning structure of the base 4, setting the cylinder spring 15 through the spring mounting hole 17, and then driving the press-fit rod 5 through the press 1. The press-fit rod 5 extends into the spring mounting seat and overcomes the elastic force of the cylinder spring 15 to compress it. After the cylinder spring 15 is compressed, the pressing stops. Then, the spring retainer ring 16 is installed into the spring mounting hole 17. Subsequently, the press 1 is reset, and the press-fit rod 5 is removed from the spring mounting hole 17, completing the press-fitting process. Since the press-fit rod 5 no longer limits the cylinder spring 15, the cylinder spring 15 rebounds, and its end abuts against the spring retainer ring 16. Finally, the cylinder 12 is removed from the positioning structure of the base 4. Therefore, the variable piston pump cylinder spring 15 press-fitting fixture disclosed in this utility model utilizes the press-fitting rod 5 to compress the cylinder spring 15, eliminating the need for manual work, improving assembly efficiency, ensuring that the cylinder spring 15 can be quickly and stably pressed into the required position, and is easy to operate, reducing the labor intensity of workers. At the same time, it avoids the defects caused by manually compressing the cylinder spring 15, which leads to long installation time and easy damage to the cylinder 12 due to improper installation, resulting in other quality problems and affecting the assembly quality of the components. Moreover, the variable piston pump cylinder spring 15 press-fitting fixture disclosed in this utility model has a simple, compact, and reasonable structure, which significantly reduces manufacturing costs.

[0036] In one specific embodiment, the end of the press-fit rod 5 that extends into the spring mounting hole 17 is a stepped press-fit structure; the stepped press-fit structure includes a plug-in portion 9 and an annular step portion 10; the plug-in portion 9 is coaxially inserted into the inner side of the end of the cylinder spring 15; the annular step portion 10 is coaxially surrounded on the outer periphery of the plug-in portion 9 and fitted into the inner periphery of the end of the cylinder spring 15. By setting the end of the press-fit rod 5 that extends into the spring mounting hole 17 as a stepped press-fit structure, the end of the cylinder spring 15 can be stably fitted, and the cylinder spring 15 can be quickly and stably pressed into the required position.

[0037] In this embodiment, preferably, the radial section of the insertion part 9 matches the inner ring structure of the cylinder spring 15, thereby enabling the annular step part 10 to adapt to the inner edge structure of the end of the cylinder spring 15, further ensuring that the cylinder spring 15 is pressed in quickly and stably.

[0038] In one specific embodiment, the press rod 5 further includes a reduced diameter section 8, which is coaxially connected to the side of the stepped press structure away from the cylinder spring 15. The cross-sectional structure of the reduced diameter section 8 is smaller than that of the stepped press structure. There is a clearance gap between the reduced diameter section 8 and the inner wall of the spring mounting hole 17. The clearance gap is used to allow the spring retaining ring 16 to be installed in the spring mounting hole 17, thereby facilitating the installation of the spring retaining ring 16 and avoiding any restriction on the installation of the spring retaining ring 16 by the press rod 5.

[0039] In this embodiment, the clearance interval is annular and surrounds the inner wall between the reduced diameter section 8 and the spring mounting hole 17, thereby providing sufficient space for the installation of the spring retaining ring 16.

[0040] In one specific embodiment, the cylinder spring 15 has a spring washer 14 with an annular structure coaxially connected to the end of the cylinder spring 15 that contacts the press rod 5. The annular step portion 10 is fitted into the inner periphery of the spring washer 14. It should be noted that in some examples of variable displacement piston pump cylinder 12, the cylinder spring 15 does not have spring washer 14 at both ends, so the annular step portion 10 is directly fitted into the end position of the cylinder spring 15. In other examples of variable displacement piston pump cylinder 12, the cylinder spring 15 has spring washer 14 at both ends. In this case, the annular step portion 10 of the press rod 5 disclosed in this utility model is directly fitted into the inner periphery of the spring washer 14, and the annular step portion 10 compresses the spring washer 14 to complete the compression of the cylinder spring 15.

[0041] In one specific embodiment, the pressing rod 5 is equipped with a pressing seat 2. The pressing seat 2 is located on the side of the cylinder body 12 where the spring mounting hole 17 is opened, and there is a gap between it and the base 4 to accommodate the cylinder body 12. The end of the pressing rod 5 that does not abut against the cylinder spring 15 is detachably connected to the pressing seat 2 so that the pressing rod 5 can be installed through the pressing seat 2. Then, for the movement of the pressing rod 5, the output end of the press 1 can be detachably connected to the pressing seat 2, thereby limiting the output end of the press 1 to move along the axis of the spring, thereby pushing the pressing seat 2 to make the pressing rod 5 move along the axis of the cylinder spring 15; or the pressing seat 2 can be movably mounted on the frame so that it can move along the axis of the cylinder spring 15, thereby making the output end of the press 1 abut against the pressing seat 2 or the end of the pressing rod 5 away from the cylinder spring 15, driving the pressing rod 5 to move, thereby compressing the cylinder spring 15.

[0042] In this embodiment, by detachably mounting the press rod 5 on the press base 2, different press rods 5 can be replaced according to the different structures of the cylinder spring 15, thereby achieving a more suitable technical effect.

[0043] In one specific embodiment, the press-fit base 2 has a first positioning through hole 11 coaxial with the cylinder spring 15; the press-fit rod 5 includes a positioning section 7 coaxially fitted into the first positioning through hole 11, the positioning section 7 is connected to a limiting plate 6, the limiting plate 6 abuts against the side surface of the press-fit base 2 away from the base 4, and is detachably connected to the press-fit base 2, so as to limit the press-fit rod 5 through the first positioning through hole 11, ensuring that when it can extend into the spring mounting hole 17, the press-fit rod 5 is coaxially set with the cylinder spring 15.

[0044] In this embodiment, the press base 2 is provided with a plurality of first threaded holes, each first threaded hole being equally spaced around the outer periphery of the first positioning through hole 11. The limiting plate 6 is provided with a plurality of second threaded holes corresponding to each first threaded hole. The corresponding first threaded holes and second threaded holes are threadedly connected by connecting bolts to lock the limiting plate 6 onto the press base 2.

[0045] In one specific embodiment, the press 1 is located on the side of the limiting plate 6 away from the pressing seat 2. The output end of the press 1 is used to abut against the limiting plate 6. Since the limiting plate 6 is directly connected to the positioning section 7, the output end of the press 1 directly acts on the limiting plate 6 to ensure the stability of pushing the pressing rod 5.

[0046] In this embodiment, the output end of the press 1 is coaxially distributed with the limiting plate 6 and the positioning section 7 to further ensure the stability of the overall pushing of the pressing rod 5.

[0047] In one specific embodiment, a plurality of elastic reset elements 3 are connected between the press base 2 and the base 4. Each elastic reset element 3 is equally spaced around the outer periphery of the cylinder spring 15 axis, and the extension and retraction direction of the elastic reset element 3 is set in the same direction as the extension and retraction direction of the cylinder spring 15. By setting the elastic reset element 3, after the output end of the press 1 is reset, the press base 2 and the press rod 5 can be automatically reset under the action of the elastic reset element 3, without the need for manual pushing of the press base 2 and the press rod 5 to reset, or without connecting the press base 2 and the press rod 5 to the output end of the press 1.

[0048] In this embodiment, the elastic reset element 3 includes, but is not limited to, a reset spring and a gas spring. By using a reset spring or a gas spring, its structural characteristics provide a certain guiding effect. Therefore, by setting a reset spring or a gas spring, it is no longer necessary to movably mount the press seat 2 and the press rod 5 on the frame, or to connect the press seat 2 and the press rod 5 to the output end of the press 1. When the press 1 abuts against the press seat 2 or the press rod 5, the reset spring or gas spring is used for guidance, so that the press rod 5 can stably press the cylinder spring 15. Or, during reset, the reset spring or gas spring can be used for guidance, so that the press rod 5 can stably detach from the cylinder spring 15 along the axial direction of the cylinder spring 15.

[0049] In one specific embodiment, the positioning structure is a second positioning through hole 13 opened on the base 4. The spline connection of the cylinder body 12 is coaxially fitted into the second positioning through hole 13. The main body of the cylinder body 12 abuts against the side of the base 4 near the press rod 5. By setting the second positioning through hole 13, it can be coaxially fitted with the spline connection of the cylinder body 12, ensuring the effectiveness of positioning the cylinder body 12. Moreover, its structure is simple and easy to implement, and the manufacturing cost is low.

[0050] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0051] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A spring press-fitting fixture for a variable displacement piston pump cylinder block, characterized in that, include: The base has a positioning structure for mounting and positioning the cylinder of the variable piston pump; A press-fit rod is located on the side of the cylinder body where the spring mounting hole is provided; the press-fit rod is used to coaxially extend into the spring mounting hole and abut against the end face of the cylinder body spring; the end of the press-fit rod extending into the spring mounting hole has a cross-sectional structure smaller than the inner ring structure of the spring retainer ring; A press is used to drive the press rod to move along the axial direction of the spring mounting hole.

2. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 1, characterized in that, The end of the pressing rod that extends into the spring mounting hole has a stepped pressing structure; the stepped pressing structure includes: The insertion part is coaxially inserted into the inner side of the end of the cylinder spring; The annular stepped portion is coaxially wrapped around the outer periphery of the insertion portion and fitted into the inner periphery of the cylinder spring end.

3. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 2, characterized in that, The press rod also includes: A reduced-diameter section is coaxially connected to the side of the stepped press-fit structure away from the cylinder spring; the cross-sectional structure of the reduced-diameter section is smaller than that of the stepped press-fit structure; there is a clearance interval between the reduced-diameter section and the inner wall of the spring mounting hole, the clearance interval being used to allow the spring retaining ring to be installed in the spring mounting hole.

4. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 2, characterized in that, The cylinder spring has a ring-shaped spring washer coaxially connected to the end that contacts the press rod, and the annular stepped portion is fitted into the inner periphery of the spring washer.

5. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 1, characterized in that, The press-fit rod is equipped with a press-fit seat, which is located on the side of the cylinder body with a spring mounting hole and has a gap between it and the base to accommodate the cylinder body. The end of the press-fit rod that does not abut against the cylinder body spring is detachably connected to the press-fit seat.

6. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 5, characterized in that, The press-fitting base is provided with a first positioning through hole coaxial with the cylinder spring; The press rod includes a positioning section coaxially fitted into the first positioning through hole. The positioning section is connected to a limiting plate, which abuts against the side surface of the press seat away from the base and is detachably connected to the press seat.

7. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 6, characterized in that, The press is located on the side of the limiting plate away from the pressing base, and the output end of the press is used to abut against the limiting plate.

8. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 5, characterized in that, Multiple elastic reset elements are connected between the press-fitting seat and the base. Each elastic reset element is equally spaced around the outer periphery of the cylinder spring axis, and the extension and retraction direction of the elastic reset element is the same as the extension and retraction direction of the cylinder spring.

9. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 8, characterized in that, The elastic reset element includes, but is not limited to, a reset spring and a gas spring.

10. The variable displacement piston pump cylinder block spring press-fit fixture according to claim 1, characterized in that, The positioning structure is a second positioning through hole opened on the base. The spline connection of the cylinder body is coaxially fitted into the second positioning through hole, and the main body of the cylinder body abuts against the side of the base near the press rod.

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