A sliding shoe and swash plate friction pair gap adjusting device and plunger equipment

Abstract

The application discloses a sliding shoe and swash plate friction pair gap adjusting device and a plunger equipment, relates to the technical field of hydraulic equipment, and can solve the problems of high production cost and time cost when adjusting the sliding shoe and swash plate friction pair gap and high assembly time and assembly cost caused by errors in the assembly process. The friction pair comprises a fixed support, a swash plate, a ring chuck and at least one sliding shoe; the swash plate is sleeved on the outer side wall of the fixed support, the inner ring of the ring chuck is in threaded connection with the outer side wall of the fixed support, the ring chuck is provided with at least one mounting through hole, each sliding shoe is mounted on the corresponding mounting through hole, and the disc surface of the swash plate is provided with an adjustable gap between the sliding shoes. The sliding shoe and swash plate friction pair gap adjusting device is used for adjusting the gap between the sliding shoe and the swash plate of the plunger equipment.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to a device for adjusting the clearance between a slipper and a swashplate friction pair and a plunger device. Background Technology

[0002] Hydraulic pumps and hydraulic motors, as the power and actuator components of a hydraulic system respectively, play a vital role. The slipper-swashplate friction pair is one of the most important friction pairs among these components. Excessive clearance between the slipper and swashplate increases internal leakage and reduces volumetric efficiency; conversely, insufficient clearance leads to increased friction and reduced mechanical efficiency. Therefore, proper clearance adjustment is crucial.

[0003] In the existing structure, the fixed support contacts and limits the chuck, and the chuck equipped with a slipper is fixedly connected to the swashplate. To adjust the required clearance value after assembling these parts, bearing bushes of different thicknesses need to be installed, significantly increasing production costs and time. Furthermore, errors occur during assembly, requiring repeated disassembly and reassembly, which is extremely inconvenient and time-consuming. Summary of the Invention

[0004] The purpose of this invention is to provide a device for adjusting the clearance between the slipper and the swashplate friction pair, which reduces the production cost and time cost of adjusting the clearance between the slipper and the swashplate friction pair, and reduces assembly errors, shortens assembly time and assembly cost.

[0005] To achieve the above objectives, the present invention provides a clearance adjustment device for the friction pair between the skid and the swashplate, comprising:

[0006] The device comprises a fixed support, a swashplate, an annular chuck, and at least one slipper; the swashplate is fitted onto the outer wall of the fixed support, the inner ring of the annular chuck is threaded to the outer wall of the fixed support, the annular chuck has at least one mounting through hole, each slipper is mounted on a corresponding mounting through hole, and there is an adjustable gap between the swashplate surface and the slipper.

[0007] Compared with the prior art, the slipper and swashplate friction pair clearance adjustment device provided by the present invention includes a fixed support, a swashplate, an annular chuck, and at least one slipper. The swashplate is sleeved on the outer wall of the fixed support, and the inner ring of the annular chuck is threadedly connected to the outer wall of the fixed support, thereby allowing the relative position of the fixed support and the annular chuck to be adjusted using the thread on the outer wall of the fixed support. Furthermore, the annular chuck has at least one mounting through hole, and each slipper is installed in a corresponding mounting through hole. Based on this, the swashplate surface and the slipper in this embodiment have an adjustable clearance. Therefore, during the assembly of the slipper and swashplate friction pair, it is not necessary to assemble bearings of different thicknesses; only one type of bearing needs to be assembled to adjust the clearance between the slipper and swashplate friction pair, greatly reducing production costs and time.

[0008] Moreover, compared with the prior art, the slipper and swashplate friction pair clearance adjustment device provided by the present invention is less prone to errors during assembly, thus shortening assembly time and assembly cost.

[0009] The present invention also provides a plunger device, including the above-described sliding shoe and swashplate friction pair clearance adjustment device.

[0010] Compared with the prior art, the beneficial effects of the plunger device provided by the present invention are the same as those of the above-mentioned sliding shoe and swashplate friction pair clearance adjustment device, which will not be elaborated here. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0012] Figure 1 This illustrates a clearance adjustment device for the friction pair between the slipper and the swashplate in an existing structure;

[0013] Figure 2 A schematic diagram of the clearance adjustment device between the slipper and the swashplate friction pair in this embodiment is shown.

[0014] Figure 3 A partial schematic diagram of the clearance adjustment device between the slipper and the swashplate friction pair in this embodiment is shown;

[0015] Figure 4a A front view of the annular chuck structure in this embodiment is shown;

[0016] Figure 4b A side view of the annular chuck structure in this embodiment is shown;

[0017] Figure 5a A front view of the retaining ring structure in this embodiment is shown;

[0018] Figure 5b A side view of the retaining ring structure in this embodiment is shown;

[0019] Figure 6a A front view of the locking nut structure in this embodiment is shown;

[0020] Figure 6b A side view of the locking nut structure in this embodiment is shown. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0024] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this disclosure should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0025] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0026] Figure 1 The diagram illustrates a clearance adjustment device for the friction pair between the slipper and the swashplate in an existing structure. (Example) Figure 1 As shown, the chuck 5' equipped with the slipper 4' and the fixed support 1' equipped with the swashplate 3' are fixedly connected and fit tightly together. To obtain the required clearance S between the slipper and the swashplate, a bearing bush 2' of a certain thickness grade needs to be selected according to the theoretical design value and installed on the fixed support 1'. Then, a clearance measuring tool is used to measure the clearance S between the slipper and the swashplate and compare it with the expected value to obtain the difference. This difference determines whether the bearing bush grade should be increased or decreased based on the trial bearing bush grade: if the measured clearance S between the slipper and the swashplate is less than the expected value, the thickness grade of the bearing bush 2' needs to be reduced; if the clearance S between the slipper and the swashplate is greater than the expected value, the thickness grade of the bearing bush 2' needs to be increased. Subsequently, the chuck 5' is separated from the fixed support 1', the bearing bush 2' of another thickness grade is replaced, and the chuck 5' equipped with the slip shoe 4' and the fixed support 1' equipped with the swashplate 3' are reconnected and tightened with a special installation tool. The threaded connection between the fixed support 1' and the chuck 5' is riveted using a punching and riveting method. The riveting point is E to prevent loosening.

[0027] To disassemble the above-mentioned parts, the riveted part E needs to be knocked open, and then the chuck 5' and the fixed support 1' need to be loosened with a special installation tool. The rest of the process is the reverse of the assembly process.

[0028] As can be seen, in the existing structure, the relative positions of the fixed support and the chuck are fixed through the threaded connection. The bearing bushes are graded, and there is a difference in thickness for each grade. During assembly, the clearance between the swashplate and the slipper is ensured by selecting the grade of the bearing bush. Therefore, during material production, bearing bushes of different thicknesses must be processed and produced, which increases production costs and time. At the same time, adjusting the clearance during assembly is also cumbersome, and the accuracy of the measurement is limited. The actual clearance measured after assembly has errors, requiring repeated disassembly and assembly, which is extremely inconvenient and takes a long time.

[0029] To address the aforementioned problems, this invention provides a device for adjusting the clearance between the slipper and the swashplate friction pair, which reduces production and time costs when adjusting the clearance between the slipper and the swashplate friction pair, and also reduces assembly errors, shortens assembly time, and reduces assembly costs. Figure 2 A schematic diagram of the clearance adjustment device between the slipper and the swashplate friction pair in this embodiment is shown. Figure 2 As shown, the friction pair clearance adjustment device between the slipper and the swashplate includes: a fixed support 6, a swashplate 3, an annular chuck 8, and at least one slipper 4; the swashplate 3 is sleeved on the outer wall of the fixed support 6, the inner ring of the annular chuck 8 is threadedly connected to the outer wall of the fixed support 6, the annular chuck 8 has at least one mounting through hole, each slipper 4 is mounted on the corresponding mounting through hole, and there is an adjustable clearance between the disc surface of the swashplate 3 and the slipper 4.

[0030] It is understood that the swashplate 3 has an inner hole, through which it is fitted onto the outer wall of the fixed support 6. The thickness of the annular chuck 8 is set to H1, and the inner ring of the annular chuck 8 is threadedly connected to the outer wall of the fixed support 6. This allows the relative position of the fixed support 6 and the annular chuck 8 to be adjusted using the thread on the outer wall of the fixed support 6. Furthermore, the annular chuck 8 has at least one mounting through hole, and each slipper 4 is mounted on a corresponding mounting through hole. Based on this, an adjustable gap exists between the swashplate 3 and the slipper 4 in this embodiment. Therefore, during the assembly of the slipper-swashplate friction pair gap adjustment device, it is not necessary to assemble bearings 7 of different thicknesses; only one type of bearing 7 needs to be assembled to adjust the gap S between the slipper and the swashplate friction pair, greatly reducing the production cost and time of the slipper-swashplate friction pair gap adjustment device. It should be understood that the thickness H1 of the annular chuck in this embodiment can be adjusted according to actual conditions and is not limited here.

[0031] Moreover, compared with the prior art, the slipper and swashplate friction pair clearance adjustment device provided by the present invention is less prone to errors during assembly, thus shortening assembly time and assembly cost.

[0032] like Figure 2 As shown, the fixed support 6 in this embodiment includes a first mounting section and a second mounting section connected to the first mounting section. The radial dimension of the first mounting section is larger than that of the second mounting section, thus forming a stepped cylindrical fixed support 6. The swashplate 3 is fitted onto the first mounting section, and the inner ring of the annular chuck 8 is threadedly connected to the outer wall of the second mounting section. This allows the annular chuck 8 to adjust the relative position between the first mounting section of the fixed support 6 and the annular chuck 8 using the thread on the outer wall of the second mounting section. During this process, the end face of the second mounting section does not contact the disc surface of the annular chuck 8, ensuring an adjustable clearance between the swashplate 3 located in the first mounting section and the slipper 4 located in the second mounting section.

[0033] For example, in this embodiment, the distance between the swashplate 3 and the part of the first mounting section near the second mounting section is greater than 0, thereby ensuring that there is a minimum gap between the swashplate 3 located in the first mounting section and the skid 4 located in the second mounting section. This allows the gap S between the swashplate and the skid to be increased or maintained only as needed after the assembly of each component is completed, reducing the time required to adjust the gap size.

[0034] For example, the clearance adjustment device between the slipper and the swashplate in this embodiment also includes a bearing 7, which is a disc-shaped bearing 7 made of a material with a low coefficient of friction, such as white metal, copper alloy, or plastic. This bearing 7 is used to solve the problem of friction and wear between the swashplate and the fixed support during the rotation of the device (excluding the swashplate). Unlike the prior art, which requires the assembly of bearings of various thicknesses, this method only requires setting one thickness level to achieve the purpose of adjusting the clearance S between the slipper and the swashplate. This solves the problem of high costs associated with the traditional method of using bearing thickness grading, effectively reducing material costs, production costs, cycle costs, and assembly costs in the development of piston pumps or piston motors, increasing profits, and shortening product production and assembly cycles.

[0035] It is understood that in this embodiment, the bearing 7 is fitted onto the first mounting section. Specifically, the first mounting section includes a base and a limiting structure connected to the base. The bearing 7 is located between the limiting structure and the disc surface of the swashplate 3, which is away from the second mounting section. The first limiting structure can be a cylinder with a diameter Φa to position the bearing 7, thereby reducing the assembly time of the slipper and swashplate friction pair clearance adjustment device. During the operation of the slipper and swashplate friction pair, the end face of the first limiting structure facing the second mounting section does not contact the disc surface of the chuck 8.

[0036] In the above structure, the inner diameter of the bearing bush 7 in this embodiment is the same as the diameter of the first limiting structure, both being Φa; the outer diameter of the bearing bush 7 is the same as the radial dimension of the base of the fixed support 6. It should be understood that the diameter of the first limiting structure can be adjusted according to actual conditions, and is not limited here.

[0037] For example, in this embodiment, the first mounting section of the fixed support 6 has a clamp support hole A for mounting and supporting the tooling fixture during assembly and disassembly. It should be understood that the shape of the clamp support hole A can be either semi-circular or rectangular, and can be adjusted according to the actual situation, without limitation here.

[0038] Figure 3 A partial schematic diagram of the clearance adjustment device for the friction pair between the slipper and the swashplate in this embodiment is shown. Figure 4a A front view of the annular chuck structure in this embodiment is shown. Figure 4bA side view of the annular chuck structure in this embodiment is shown. Figure 3 , Figure 4a and Figure 4b As shown, the inner ring of the annular chuck 8 is threadedly connected to the outer wall of the fixed support 6. The inner ring of the annular chuck 8 has an internal thread that matches the thread on the outer wall of the fixed support 6. The distribution circle diameter of the stop ring limiting hole C on the annular chuck 8 is Φd1, and the thickness of the annular chuck 8 is H1. It should be understood that the distribution circle diameter of the stop ring limiting hole C on the annular chuck 8 in this embodiment can be adjusted according to actual conditions and is not limited here.

[0039] In this embodiment, the annular chuck 8 has at least one support hole B for rotating the annular chuck 8. The shape of the support hole B can be semi-circular or rectangular, and can be adjusted according to the actual situation, without limitation. Each support hole B is evenly distributed along the circumferential direction of the annular chuck 8. Each support hole B is located between two adjacent mounting through holes of two slippers 4, and is used for tooling support during assembly and disassembly. The number of support holes B can be 1 to 3 or more, and the specific number can be adjusted according to the actual situation, without limitation.

[0040] In practical applications, in order to adjust the gap S between the slipper and the swashplate, a tool can be inserted into the support hole B on the annular chuck 8, and the annular chuck can be rotated clockwise. When the gap between the end face of the slipper 4 facing the first mounting section and the end face of the swashplate 3 facing the second mounting section reaches the expected value, the rotation of the annular chuck 8 can be stopped.

[0041] It is understood that in this embodiment, the side of the annular chuck 8 facing the first mounting section is considered the front, and the side of the annular chuck away from the first mounting section is considered the back side 8' (i.e., the side with the plunger). In this embodiment, the back side 8' of the annular chuck has at least one stop ring limiting hole C. Specifically, in this embodiment, at least one stop ring limiting hole C with a diameter of Φd2 is provided between the mounting through holes of two adjacent slippers 4 on the back side of the annular chuck 8 for supporting and limiting the stop ring 9, reducing the probability of the stop ring 9 loosening and falling off during the relative movement of various components. Generally, the number of stop ring limiting holes C is 1 to 3, or more, which can be adjusted according to the actual situation. In addition, in this embodiment, the above-mentioned stop ring limiting hole C can be either a through hole or a countersunk hole, which can be adjusted according to the actual situation and is not limited here.

[0042] Figure 5a A front view of the retaining ring structure in this embodiment is shown. Figure 5b A side view of the retaining ring structure in this embodiment is shown. Figure 2 , Figure 5a and Figure 5bAs shown, the clearance adjustment device for the friction pair between the slipper and the swashplate in this embodiment also includes at least one retaining ring 9 to prevent loosening. The retaining ring 9 has an inner annular structure. The outer diameter of this annular structure can be less than or equal to the distribution circle diameter Φd1 of the retaining ring limiting hole C on the annular chuck 8. That is, the radius R1 of the annular structure ≤ Φd1 / 2. It is worth noting that this radius R1 is the maximum radius of the annular structure. If the radius is greater than R1, the diameter of the annular structure will be greater than the distribution circle diameter of the retaining ring limiting hole C on the annular chuck 8, and the outer circle of the retaining ring 9 will interfere with other parts, affecting their normal operation.

[0043] In this embodiment, the retaining ring 9 has lugs 11 and trunnions 12. Two lugs 11 are located on the upper side of the retaining ring 9 and are used to fasten to other components to prevent them from loosening. The trunnion 12 has a distribution circle diameter of Φd1 to facilitate insertion into the retaining ring limiting hole C on the annular chuck 8. The trunnion 12 has an outer diameter of Φd3 and a height of H2. Furthermore, in this embodiment, the distance between the end of the trunnion 12 furthest from the annular structure and the annular structure is H3, where H3 is less than H1 and H2 is less than Φd3. The trunnion 12 has a D-shaped cross-section. In practical applications, the aforementioned D-shaped trunnion 12 is installed in the corresponding retaining ring limiting hole C to support and limit the trunnion 12 of the retaining ring 9.

[0044] Figure 6a A front view of the locking nut structure in this embodiment is shown. Figure 6b A side view of the locking nut structure in this embodiment is shown. Figure 2 , Figure 6a and Figure 6b As shown, the clearance adjustment device for the friction pair between the slipper and the swashplate in this embodiment also includes a locking nut 10. The locking nut 10 adopts an external polygonal structure, specifically, it can be a locking nut 10 with an octagonal to a dodecagonal structure to reduce the size of the locking nut 10. In addition, the through hole of the locking nut 10 has an internal thread that matches the thread on the outer side wall of the fixed support 6, which is used to lock the fixed support 6 after the clearance S between the slipper and the swashplate friction pair is adjusted. Furthermore, each lug engages with the locking nut 10 to limit the relative movement between the annular chuck 8, the locking nut 10, and the fixed support 6.

[0045] Based on this, in this embodiment, during parts assembly, the bearing shell 7 is installed on the fixed support 6, the fixed support 6 with the bearing shell 7 is inserted into the inner hole of the swashplate 3, the slipper 4 with the plunger is installed into the mounting through hole of the annular chuck 8, and then the annular chuck 8 with the slipper 4 is threadedly connected to the outer wall of the fixed support 6, wherein the inner ring of the annular chuck 8 has an internal thread that matches the thread of the outer wall of the fixed support 6. Insert the tool into the support hole B on the outer periphery of the annular chuck 8, and rotate the annular chuck clockwise. When the gap between the end face of the slipper 4 facing the first mounting section and the end face of the swashplate 3 facing the second mounting section reaches the expected value, stop rotating the annular chuck 8, and install the retaining ring 9. The trunnion 12 of the retaining ring 9 is aligned with the retaining ring limiting hole C on the annular chuck 8 and is pressed tightly against the reverse side of the annular chuck 8. Then, screw the locking nut 10 into the fixed support 6. The through hole of the locking nut 10 has an internal thread that matches the thread on the outer side wall of the fixed support 6. While inserting the tool into the clamp support hole A of the fixed support 6, insert the tool into the outer polygon of the locking nut 10 and tighten the locking nut 10 to the annular chuck 8. Fold up the two lugs 11 at the other end of the retaining ring 9 and place them close to the plane of the polygon of the locking nut 10 to limit the relative movement of the annular chuck 8, the locking nut 10 and the fixed support 6, thereby preventing loosening.

[0046] During disassembly, first fold down the two lugs 11 of the retaining ring 9 to detach it from the plane of the polygonal corners of the locking nut 10. While inserting the tool into the outer polygonal corners of the locking nut 10, insert the tool into the clamp support hole A of the fixed support 6. Rotate the locking nut 10 counterclockwise and remove it. Then remove the retaining ring 9, and insert the tool into the semicircle of the outer circumference of the annular chuck 8. Rotate the annular chuck 8 counterclockwise to remove it, thus completing the disassembly of the parts.

[0047] The present invention also provides a plunger device, the system including the above-mentioned slipper and swashplate friction pair clearance adjustment device, for adjusting the clearance between the slipper and swashplate friction pair.

[0048] The aforementioned plunger device can be either a plunger motor or a plunger pump, and this is not limited to either. In practical applications, each plunger pump or plunger motor requires different clearances depending on its size and operating conditions. Therefore, the clearance adjustment device for the slipper and swashplate friction pair provided by this invention can be used to adjust the clearance, thereby reducing the production and time costs of adjusting the clearance of the slipper and swashplate friction pair, reducing assembly errors, and shortening assembly time and costs.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for adjusting the clearance between a sliding shoe and a swashplate friction pair, characterized in that, include: A fixed support, a swashplate, an annular chuck, and at least one slipper; the swashplate is sleeved on the outer wall of the fixed support, the inner ring of the annular chuck is threaded to the outer wall of the fixed support, the annular chuck has at least one mounting through hole, each slipper is mounted on the corresponding mounting through hole, and there is an adjustable gap between the swashplate surface and the slipper. The fixed support includes a first mounting section and a second mounting section connected to the first mounting section. The radial dimension of the first mounting section is larger than that of the second mounting section. The swashplate is sleeved on the first mounting section, and the inner ring of the annular chuck is threadedly connected to the outer wall of the second mounting section. The clearance adjustment device for the friction pair between the slipper and the swashplate also includes a locking nut. The through hole of the locking nut has an internal thread that matches the thread of the outer wall of the fixed support. The clearance adjustment device for the friction pair between the slipper and the swashplate also includes at least one retaining ring. The retaining ring has a trunnion and two lugs. The annular chuck has at least one retaining ring limiting hole on the part opposite to the second mounting section. The trunnion is installed in the corresponding retaining ring limiting hole. Each lug is fastened to the locking nut to limit the relative movement between the annular chuck, the locking nut, and the fixed support.

2. The swash plate friction pair clearance adjusting device according to claim 1, characterized by, The distance between the swash plate and the portion of the first mounting section near the second mounting section is greater than 0.

3. The swash plate friction pair clearance adjusting device according to claim 1, characterized by, The first mounting section of the fixed support has a clamp support hole for mounting and supporting tooling fixtures during assembly and disassembly.

4. The swash plate friction pair clearance adjusting device according to claim 1, characterized by, The clearance adjustment device for the friction pair between the slipper and the swashplate also includes a bearing bush, which is sleeved on the first mounting section; the first mounting section includes a base and a limiting structure connected to the base, and the bearing bush is located between the limiting structure and the surface of the swashplate away from the second mounting section.

5. The swash plate friction pair clearance adjusting device according to any one of claims 1 to 4, characterized by The locking nut is a locking nut with an octagonal to dodecagonal structure.

6. The swash plate friction pair clearance adjusting device according to claim 1, characterized by The annular chuck has at least one support hole for rotating the annular chuck, and the support holes are distributed along the circumferential direction of the annular chuck.

7. A plunger apparatus characterized by, Includes the shoe and swashplate friction pair clearance adjustment device as described in any one of claims 1 to 6.

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