Sliding bearing mounting tool

Abstract

The utility model provides a kind of sliding bearing installation tool, including locating seat and pressing sleeve, locating seat is used to axial limit and abut on the one side of the shaft hole of pump cover, locating seat is equipped with the guide shaft of the shaft hole of coaxial through pump cover;Pressing sleeve is slidably sleeved on guide shaft, and bearing part for being inserted to the shaft hole of sliding bearing is equipped on pressing sleeve, and pressing sleeve includes the pressing process position of separation pump cover, and the pressing terminal position of the other side of the shaft hole of axial limit and abut on pump cover.The utility model can convert the dynamic centering process in existing assembly into static positioning and guiding process by tool manufacturing precision, ensure that the concentricity of sliding bearing relative to pump cover can always reach design standard, effectively avoid bearing eccentric wear, local overheating and brittle fracture failure caused by poor centering, improve the operation reliability and service life of sliding bearing, and help to improve installation convenience and installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fluid machinery assembly tools, and in particular to a sliding bearing installation fixture. Background Technology

[0002] The sliding bearing in a heat transfer pump is a core component, typically located on the impeller side. It bears the main weight of the rotor and the radial force of the impeller, playing a crucial role in ensuring the pump's long-term stable and reliable operation. Existing sliding bearings are generally made of silicon carbide, a material with a much lower coefficient of thermal expansion than metals and high wear resistance, but also relatively brittle. Based on these material properties, a clearance is designed between the sliding bearing and the pump cover in the mounting structure. To ensure the sliding bearing remains stably fixed to the pump cover both at room temperature and under high-temperature operating conditions, a metal tolerance ring is installed between them. This tolerance ring, acting as an elastic element, provides a uniform circumferential elastic clamping force to secure the bearing when compressed between the bearing and the pump cover, while simultaneously generating sufficient frictional torque to prevent relative rotation between the bearing and the pump cover. In this structure, the concentricity of the sliding bearing and the pump cover is a critical technical indicator, typically required to be controlled between 0.02mm and 0.04mm. If concentricity cannot be guaranteed, the sliding bearing will experience uneven wear during pump operation, leading to localized overheating of the brittle silicon carbide bearing and potentially causing it to break and fail. Currently, the common installation method involves first inserting a tolerance ring into the pump cover's mounting groove, and then pushing the sliding bearing into the pump cover from one side with a certain axial force, overcoming the frictional resistance generated by the tolerance ring. However, this existing installation method has significant drawbacks: it is extremely difficult to simultaneously ensure the high concentricity between the sliding bearing and the pump cover during the application of force to install the sliding bearing. Poor alignment will result in uneven circumferential force on the tolerance ring, causing localized plastic deformation. This not only causes an abnormally increased installation resistance, damaging the bearing and tolerance ring, but even if the bearing is forcibly pushed to its axial design position, its final concentricity with the pump cover cannot be guaranteed, posing a potential threat to the pump's long-term operation. Therefore, ensuring the concentricity of the sliding bearing and the pump cover while improving installation convenience and efficiency has become an urgent technical problem to be solved. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a sliding bearing installation fixture to ensure the concentricity of the sliding bearing and the pump cover, and to improve the convenience and efficiency of installation.

[0004] The above-mentioned objective of this utility model can be achieved by the following technical solution: This utility model provides a sliding bearing mounting fixture, including: A positioning seat is used to axially limit and abut against one side of the shaft hole of the pump cover. The positioning seat is provided with a guide shaft that coaxially passes through the shaft hole of the pump cover. A pressure sleeve is slidably fitted onto the guide shaft. The pressure sleeve has a bearing portion for insertion into the shaft hole of the sliding bearing. The pressure sleeve includes a pressing position that is detached from the pump cover and a pressing end position that is axially limited and abuts against the other side of the shaft hole of the pump cover.

[0005] In a preferred embodiment of the present invention, the sliding bearing mounting fixture further includes a driving structure, which is used to push the pressure sleeve from the pressing process position to the pressing end position.

[0006] In a preferred embodiment of the present invention, the drive structure includes a push nut, and at least a portion of the guide shaft is provided with an external thread section. The push nut is threadedly connected to the external thread section, and the push nut can abut against the pressure sleeve.

[0007] In a preferred embodiment of the present invention, the driving structure includes a hydraulic cylinder, and the piston rod of the hydraulic cylinder can abut against the pressure sleeve.

[0008] In a preferred embodiment of the present invention, the positioning seat includes a first axial limiting part for axially limiting and abutting against one side of the shaft hole of the pump cover, and a first radial limiting part for coaxially inserting into the shaft hole of the pump cover. The pressure sleeve includes a second axial limiting part for axially limiting and abutting against the other side of the shaft hole of the pump cover, and a second radial limiting part for coaxially inserting into the shaft hole of the pump cover. The second radial limiting part is axially connected to the bearing part.

[0009] In a preferred embodiment of the present invention, the pressure sleeve further includes an insertion portion axially connected to the bearing portion, and the first radial limiting portion is provided with a positioning slot arranged around the guide shaft and matching the insertion portion, and the insertion portion can be inserted into the positioning slot to achieve radial limiting.

[0010] In a preferred embodiment of the present invention, the second radial limiting part is provided with a radial clamping end face, and the bearing part is provided with an axial clamping end face. The radial clamping end face and the axial clamping end face are connected to form a stepped structure for clamping the sliding bearing.

[0011] In a preferred embodiment of the present invention, the pressure sleeve further includes a hollowed-out groove disposed at the connection between the radial clamping end face and the axial clamping end face, the hollowed-out groove being used to prevent the connection between the radial clamping end face and the axial clamping end face from over-constraining the sliding bearing.

[0012] In a preferred embodiment of the present invention, the sliding bearing mounting fixture further includes a buffer structure disposed on the radial clamping end face. The buffer structure includes a first mounting groove circumferentially disposed on the radial clamping end face and a first elastic element disposed in the first mounting groove, or the buffer structure includes an elastic pad disposed on the radial clamping end face.

[0013] In a preferred embodiment of the present invention, the sliding bearing mounting fixture further includes an elastic retaining structure disposed on the axial clamping end face. The elastic retaining structure includes a second mounting groove circumferentially disposed on the axial clamping end face and a second elastic member disposed in the second mounting groove. The second elastic member can be used to elastically abut against the sliding bearing.

[0014] In a preferred embodiment of the present invention, along the direction away from the second radial limiting portion, the bearing portion includes a first bearing section, an inwardly recessed ramp section, and a second bearing section connected together, and the elastic retaining structure is disposed on the second bearing section.

[0015] In a preferred embodiment of this utility model, the included angle between the inward-curving ramp section and the axis of the guide shaft is α, where 10°≤α≤30°.

[0016] In a preferred embodiment of this utility model, the positioning seat is detachably circumferentially limited to the pump cover.

[0017] The technical solution of this utility model has the following significant beneficial effects: The sliding bearing installation fixture of this invention establishes an installation positioning benchmark by setting a positioning seat. A pressure sleeve supports the sliding bearing to be installed, and a guide shaft is provided on the positioning seat. The guide shaft provides a precise axial movement path for the pressure sleeve, allowing the sliding bearing on the pressure sleeve to be pressed axially into the tolerance ring on the pump cover, ensuring the concentricity between the sliding bearing and the pump cover. This invention transforms the dynamic alignment process in existing assembly, which relies on worker experience, into a static positioning and guiding process guaranteed by the manufacturing precision of the fixture. This systematically ensures that the concentricity of the sliding bearing relative to the pump cover always meets the design standard throughout the installation process and at the final pressing position. It effectively avoids bearing wear, localized overheating, and brittle fracture failure caused by poor alignment, fundamentally improving the operational reliability and service life of the sliding bearing, and contributing to improved installation convenience and efficiency. Sliding bearings installed using the sliding bearing installation fixture of this invention can be better applied to various types of pump equipment, such as heat medium pumps, significantly improving the operational reliability and service life of the pump equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of 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.

[0019] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0020] Figure 1 This is a side sectional view of the sliding bearing mounting fixture of this utility model in the press-fitting process position; Figure 2 This is a side sectional view of the sliding bearing mounting fixture of this utility model at the press-fitting end position; Figure 3 This is a side sectional view of one embodiment of the positioning seat described in this utility model; Figure 4 This is a side sectional view of one embodiment of the positioning seat and pressure sleeve described in this utility model; Figure 5 This is a side sectional view of one embodiment of the pressure sleeve and sliding bearing described in this utility model; Figure 6 for Figure 5 A magnified schematic diagram of a partial structure at point A in the middle; Figure 7 for Figure 5 A magnified schematic diagram of a localized structure at point B; Figure 8 for Figure 5 A magnified schematic diagram of a local structure at point C.

[0021] The reference numerals in the above figures are as follows: 10. Pump cover; 20. Sliding bearings; 30. Tolerance ring; 100, Positioning seat; 110, Guide shaft; 111, External thread section; 120, First axial limiting part; 130, First radial limiting part; 140, Positioning slot; 200, Pressure sleeve; 210, Bearing part; 211, Axial clamping end face; 212, First bearing section; 213, Inwardly tapered ramp section; 214, Second bearing section; 220, Second axial limiting part; 230, Second radial limiting part; 231, Radial clamping end face; 240, Insertion part; 250, Hollowed-out groove; 300. Drive structure; 310. Push nut; 400, Buffer structure; 410, First mounting groove; 420, First elastic element; 500, Elastic retaining structure; 510, Second mounting groove; 520, Second elastic element. Detailed Implementation

[0022] 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.

[0023] Please refer to the following: Figures 1 to 8 As shown, an embodiment of this utility model provides a sliding bearing installation fixture, which includes a positioning seat 100 and a pressure sleeve 200. The positioning seat 100 is used to axially limit and abut against one side of the shaft hole of the pump cover 10. The positioning seat 100 is provided with a guide shaft 110 that coaxially passes through the shaft hole of the pump cover 10. The pressure sleeve 200 is slidably sleeved on the guide shaft 110. The pressure sleeve 200 is provided with a bearing portion 210 for insertion into the shaft hole of the sliding bearing 20. The pressure sleeve 200 includes a pressing position that is detached from the pump cover 10 and a pressing end position that is axially limited and abuts against the other side of the shaft hole of the pump cover 10.

[0024] Overall, the sliding bearing installation fixture establishes an installation positioning reference by setting a positioning seat 100, and the pressure sleeve 200 can support the sliding bearing 20 to be installed. Furthermore, a guide shaft 110 is provided on the positioning seat 100, which provides a precise axial movement path for the pressure sleeve 200, so that the sliding bearing 20 on the pressure sleeve 200 can be pressed axially into the tolerance ring 30 on the pump cover 10, and the concentricity between the sliding bearing 20 and the pump cover 10 is ensured.

[0025] like Figure 1 and Figure 2As shown in the embodiment, this utility model can transform the dynamic alignment process in existing assembly, which relies on worker experience, into a static positioning and guiding process guaranteed by the precision of tooling manufacturing. This systematically ensures that the concentricity of the sliding bearing 20 relative to the pump cover 10 reaches the design standard throughout the installation process and at the press-fit end position. It effectively avoids bearing wear, local overheating, and brittle fracture failure caused by poor alignment, fundamentally improving the operational reliability and service life of the sliding bearing 20, and also helps to improve installation convenience and efficiency.

[0026] The sliding bearing 20 installed using this invention can be better applied to various types of pump equipment, such as heat medium pumps, significantly improving the operational reliability and service life of the pump equipment.

[0027] During the process of pushing the pressure sleeve 200 and the sliding bearing 20 into the pump cover 10, the tolerance ring 30 on the pump cover 10 will generate a frictional force that resists the pushing of the sliding bearing 20, thereby affecting the pressing efficiency.

[0028] To solve the above technical problems, such as Figure 1 and Figure 2 In the embodiment shown, the sliding bearing mounting fixture further includes a drive structure 300, which is used to push the pressure sleeve 200 from the pressing process position to the pressing end position.

[0029] By setting the drive structure 300, a stable and controllable power source is provided for the axial movement of the pressure sleeve 200, enabling the operator to push the sliding bearing 20 into the pump cover 10 with a smooth and uniform force. This effectively overcomes the frictional force generated by the tolerance ring 30 on the outer surface of the sliding bearing 20, allowing the sliding bearing 20 to be quickly installed in the designated position and improving installation efficiency.

[0030] Furthermore, the drive structure 300 provides uniform downward pressure, avoiding damage to the sliding bearing 20 or tolerance ring 30 caused by uneven force application or impact, thus ensuring the controllability and safety of the installation process.

[0031] Designers may adjust the specific structure of the drive structure 300 according to the needs of use, and no specific restrictions are imposed here.

[0032] In one feasible embodiment, such as Figure 1 and Figure 2 In the embodiment shown, the drive structure 300 includes a push nut 310, and at least a portion of the guide shaft 110 is provided with an external thread section 111. The push nut 310 is threadedly connected to the external thread section 111, and the push nut 310 can abut against the pressure sleeve 200.

[0033] The push nut 310 can form a threaded pair with the external thread section 111 on the guide shaft 110. By rotating the push nut 310, a stable and easily controllable axial thrust can be generated. Furthermore, the self-locking characteristic of the thread can pause and maintain the state at any position during installation, which is convenient for inspection and adjustment during installation and improves the ease of operation.

[0034] In another feasible embodiment, the drive structure 300 includes a hydraulic cylinder, the piston rod of which can abut against the pressure sleeve 200. By using a hydraulic cylinder as the drive structure 300, controllable and extremely smooth axial thrust can be provided, which is particularly suitable for scenarios with high installation resistance or high requirements for the smoothness of the pressing process.

[0035] Furthermore, hydraulic drive facilitates stepless speed regulation and precise pressure control, which can maximize the protection of the brittle sliding bearing 20 and the precision tolerance ring 30, avoiding impact damage.

[0036] In the embodiments of this utility model, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 In the embodiment shown, the positioning seat 100 includes a first axial limiting portion 120 for axially limiting and abutting against one side of the shaft hole of the pump cover 10, and a first radial limiting portion 130 for coaxially inserting into the shaft hole of the pump cover 10. The pressure sleeve 200 includes a second axial limiting portion 220 for axially limiting and abutting against the other side of the shaft hole of the pump cover 10, and a second radial limiting portion 230 for coaxially inserting into the shaft hole of the pump cover 10. The second radial limiting portion 230 is axially connected to the bearing portion 210.

[0037] By cooperating with the first axial limiting part 120 and the first radial limiting part 130, the positioning seat 100 and the guide shaft 110 are accurately positioned, so that the positioning seat 100 can be accurately positioned on one side of the shaft hole of the pump cover 10.

[0038] The second axial limiting part 220 realizes the axial limiting of the pressure sleeve 200, so that the pressure sleeve 200 can be accurately positioned on the other side of the shaft hole of the pump cover 10. The second radial limiting part 230 is spaced apart from the inner wall of the shaft hole of the pump cover 10, so that it will not affect the axial movement of the pressure sleeve 200.

[0039] Furthermore, the pressure sleeve 200 and the guide shaft 110 can only slide axially, thereby using the positioning seat 100, the guide shaft 110 and the pressure sleeve 200 to define the movement range of the sliding bearing 20, achieving precise positioning at both ends and ensuring the final concentricity of the sliding bearing 20.

[0040] In the embodiments of this utility model, such as Figure 2 and Figure 4In the embodiment shown, the pressure sleeve 200 further includes an insertion portion 240 that is axially connected to the support portion 210. The first radial limiting portion 130 is provided with a positioning slot 140 that is arranged around the guide shaft 110 and matches the insertion portion 240. The insertion portion 240 can be inserted into the positioning slot 140 to achieve radial limiting.

[0041] The positioning slot 140 and the insertion part 240 can be inserted into each other, and the outer wall of the insertion part 240 can be radially limited to the inner wall of the positioning slot 140. When the pressure sleeve 200 begins to enter the shaft hole of the pump cover 10, the positioning slot 140 provides radial limitation and axial guidance for the insertion part 240, realizing radial limitation between the positioning seat 100 and the pressure sleeve 200. At the same time, the first radial limiting part 130 can be coaxially inserted into the shaft hole of the pump cover 10, realizing radial limitation between the pump cover 10 and the positioning seat 100, and the bearing part 210 can radially limit the sliding bearing 20, thereby ensuring the final concentricity of the pump cover 10 and the sliding bearing 20.

[0042] In the embodiments of this utility model, such as Figure 5 and Figure 6 In the embodiment shown, the second radial limiting part 230 is provided with a radial clamping end face 231, and the bearing part 210 is provided with an axial clamping end face 211. The radial clamping end face 231 and the axial clamping end face 211 are connected to form a stepped structure for clamping the sliding bearing 20.

[0043] The radial clamping end face 231 and the axial clamping end face 211 cooperate to form a stepped structure, which provides a reliable bearing base for the sliding bearing 20. Specifically, the radial clamping end face 231 is mainly used to provide axial thrust to the sliding bearing 20 during the pressing process, while the axial clamping end face 211 is used to hold the sliding bearing 20 to prevent it from accidentally falling off and being damaged.

[0044] In one specific embodiment, the axial clamping end face 211 is an annular end face, which can precisely fit with the inner surface of the sliding bearing 20, thereby maintaining high concentricity. The high concentricity range is 0-0.02 mm.

[0045] In the embodiments of this utility model, such as Figure 5 and Figure 6 In the embodiment shown, the pressure sleeve 200 further includes a cutout groove 250 disposed at the connection between the radial clamping end face 231 and the axial clamping end face 211. The cutout groove 250 is used to prevent the connection between the radial clamping end face 231 and the axial clamping end face 211 from over-constraining the sliding bearing 20.

[0046] By setting a hollowed-out groove 250 at the connection, it is possible to prevent the connection from over-constraining the sliding bearing 20, avoiding rigid interference between the sharp corner of the connection and the bearing end face due to machining errors or thermal expansion, releasing potential assembly stress, and enabling the sliding bearing 20 to maintain surface contact with the radial clamping end face 231 and the axial clamping end face 211, effectively reducing or eliminating the risk of breakage of the sliding bearing 20 due to local stress concentration during press-fitting.

[0047] In the embodiments of this utility model, such as Figure 5 and Figure 7 In the illustrated embodiment, the sliding bearing mounting fixture also includes a buffer structure 400 disposed on the radial clamping end face 231. By providing the buffer structure 400 on the radial clamping end face 231, the buffer structure 400 can provide a certain elastic buffering effect during the press-fitting of the sliding bearing 20, avoiding rigid impact and playing a protective role, thereby reducing the risk of damage to the sliding bearing 20. This technology is particularly effective when dealing with brittle silicon carbide sliding bearings 20.

[0048] Designers may adjust the specific construction of the buffer structure 400 according to the needs of use, and no specific limitations are imposed here. In one feasible embodiment, the buffer structure 400 includes a first mounting groove 410 circumferentially disposed on the radial clamping end face 231, and a first elastic member 420 disposed in the first mounting groove 410.

[0049] By providing a first mounting groove 410 and placing the first elastic element 420 within the first mounting groove 410, the installation stability of the first elastic element 420 is improved. Preferably, the first elastic element 420 can be configured as a first sealing ring.

[0050] In another feasible embodiment, the buffer structure 400 includes an elastic pad disposed on the radial clamping end face 231. The elastic pad can achieve a more uniform buffering effect.

[0051] In the embodiments of this utility model, such as Figure 5 and Figure 8 In the illustrated embodiment, the sliding bearing mounting fixture further includes an elastic retaining structure 500 disposed on the axial clamping end face 211. By providing the elastic retaining structure 500 on the axial clamping end face 211, the elastic retaining structure 500 can abut against the sliding bearing 20 to maintain the relative position of the pressure sleeve 200 and the sliding bearing 20, preventing the sliding sleeve from accidentally disengaging from the bearing portion 210 of the pressure sleeve 200. Furthermore, the elastic retaining structure 500 also acts as a buffer, preventing excessive impact before the bearing portion 210 and the sliding bearing 20 reach full contact, thus preventing damage to the sliding bearing 20.

[0052] Designers can adjust the specific structure of the elastic retaining structure 500 according to the usage requirements, and no specific limitations are made here. In one feasible embodiment, the elastic retaining structure 500 includes a second mounting groove 510 circumferentially disposed on the axial clamping end face 211, and a second elastic member 520 disposed in the second mounting groove 510, the second elastic member 520 being able to elastically abut against the sliding bearing 20.

[0053] Preferably, the second elastic element 520 can be configured as a second sealing ring. The second sealing ring can be pressed annularly against the inner surface of the sliding bearing 20, which can play a certain buffering role and help maintain the concentricity between the sliding bearing 20 and the pressure sleeve 200. Moreover, the second sealing ring is in a compressed state, which will not affect the fitting accuracy between the sliding bearing 20 and the pressure sleeve 200.

[0054] In an embodiment of this utility model, along the direction away from the second radial limiting part 230, the bearing part 210 includes a first bearing section 212, an inwardly recessed ramp section 213 and a second bearing section 214 that are in contact with each other, and an elastic retaining structure 500 is disposed on the second bearing section 214.

[0055] The first bearing section 212 has a larger radial dimension and can provide radial restraint to hold the sliding bearing 20 in place. The second bearing section 214 has a smaller radial dimension and can be easily inserted into the inner hole of the sliding bearing 20. The inwardly tapered ramp section 213 can play a transitional guiding role between the first bearing section 212 and the second bearing section 214 through the ramp surface, so that the sliding bearing 20 can smoothly transition from the second bearing section 214 to the first bearing section 212.

[0056] Furthermore, by setting the second bearing section 214 and the inner hole of the sliding bearing 20 radially apart, an installation space is provided for the elastic retaining structure 500, which avoids the elastic retaining structure 500 being excessively compressed between the second bearing section 214 and the sliding bearing 20, making the loading and unloading process of the sliding bearing 20 smoother and easier to operate.

[0057] In embodiments of this utility model, designers can adjust the inclination angle of the inward-sloping section 213 according to usage needs; no specific limitations are imposed here. Preferably, as... Figure 8 In the illustrated embodiment, the angle between the inward-curving ramp section 213 and the axis of the guide shaft 110 is α, where 10° ≤ α ≤ 30°. For example, α can be set to 10°, 11°, 13°, 15°, 17°, 19°, 20°, 25°, 30°, or other values. More preferably, α is set to 15°.

[0058] By limiting the included angle α of the inward-recessed ramp section 213 to between 10° and 30°, the inward-recessed ramp section 213 can provide a better guiding effect while occupying less space, ensuring that the sliding bearing 20 can be smoothly and easily guided into the first bearing section 212.

[0059] In this embodiment of the invention, the positioning seat 100 is detachably and circumferentially connected to the pump cover 10. By making the positioning seat 100 detachably connected to the pump cover 10, it is ensured that the sliding bearing mounting fixture can be repeatedly and accurately installed on each pump cover 10, thus improving ease of use.

[0060] Furthermore, by circumferentially limiting the positioning seat 100 and the pump cover 10, when the drive structure 300 is the push nut 310, the circumferential rotation of the positioning seat 100 is prevented, thereby ensuring the driving effect of the push nut 310.

[0061] Designers may adjust the specific connection method between the positioning seat 100 and the pump cover 10 according to the needs of use, and no specific restrictions are imposed here.

[0062] In one feasible embodiment, the positioning seat 100 is detachably connected to the pump cover 10 by bolts, and the bolts can also play a circumferential limiting role between the positioning seat 100 and the pump cover 10.

[0063] In another feasible embodiment, the positioning seat 100 and the pump cover 10 are detachably connected by a clamp, and the clamp can also play a circumferential limiting role between the positioning seat 100 and the pump cover 10.

[0064] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sliding bearing mounting fixture, characterized in that, include: A positioning seat is provided for axially limiting and abutting against one side of the shaft hole of the pump cover. The positioning seat is provided with a guide shaft that coaxially passes through the shaft hole of the pump cover. The positioning seat includes a first axial limiting part for axially limiting and abutting against one side of the shaft hole of the pump cover, and a first radial limiting part for coaxially inserting into the shaft hole of the pump cover. A pressure sleeve is slidably fitted onto the guide shaft. The pressure sleeve includes a second axial limiting portion for axially limiting and abutting against the other side of the shaft hole of the pump cover, and a second radial limiting portion for coaxially inserting into the shaft hole of the pump cover. The pressure sleeve has a bearing portion for inserting into the shaft hole of a sliding bearing. The second radial limiting portion is axially connected to the bearing portion. The second radial limiting portion has a radial clamping end face, and the bearing portion has an axial clamping end face. The radial clamping end face and the axial clamping end face are connected to form a stepped structure for clamping the sliding bearing. The pressure sleeve includes a press-fitting position that is detached from the pump cover and a press-fitting terminal position that is axially limited and abutting against the other side of the shaft hole of the pump cover. A buffer structure is disposed on the radial clamping end face.

2. The sliding bearing mounting fixture as described in claim 1, characterized in that, The pressure sleeve also includes a hollowed-out groove at the connection between the radial clamping end face and the axial clamping end face, the hollowed-out groove being used to prevent the connection between the radial clamping end face and the axial clamping end face from over-constraining the sliding bearing.

3. The sliding bearing mounting fixture as described in claim 1, characterized in that, The buffer structure includes a first mounting groove circumferentially disposed on the radial clamping end face and a first elastic member disposed in the first mounting groove, or the buffer structure includes an elastic pad disposed on the radial clamping end face.

4. The sliding bearing mounting fixture as described in claim 1, characterized in that, The sliding bearing mounting fixture also includes a drive structure, which is used to move the pressure sleeve from the pressing process position to the pressing end position.

5. The sliding bearing mounting fixture as described in claim 4, characterized in that, The drive structure includes a push nut, and at least a portion of the guide shaft is provided with an external thread section. The push nut is threadedly connected to the external thread section and can abut against the pressure sleeve.

6. The sliding bearing mounting fixture as described in claim 4, characterized in that, The drive structure includes a hydraulic cylinder, the piston rod of which can abut against the pressure sleeve.

7. The sliding bearing mounting fixture as described in claim 1, characterized in that, The pressure sleeve also includes an insertion part that is axially connected to the bearing part. The first radial limiting part is provided with a positioning slot that is arranged around the guide shaft and matches the insertion part. The insertion part can be inserted into the positioning slot to achieve radial limiting.

8. The sliding bearing mounting fixture as described in claim 1, characterized in that, The sliding bearing mounting fixture further includes an elastic retaining structure disposed on the axial clamping end face. The elastic retaining structure includes a second mounting groove circumferentially disposed on the axial clamping end face and a second elastic member disposed in the second mounting groove. The second elastic member can be used to elastically abut against the sliding bearing.

9. The sliding bearing mounting fixture as described in claim 8, characterized in that, Along the direction away from the second radial limiting portion, the bearing portion includes a first bearing section, an inwardly recessed ramp section, and a second bearing section that are in contact with each other, and the elastic retaining structure is disposed on the second bearing section.

10. The sliding bearing mounting fixture as described in claim 9, characterized in that, The angle between the inward-sloping section and the axis of the guide shaft is α, where 10°≤α≤30°.

11. The sliding bearing mounting fixture as described in claim 1, characterized in that, The positioning seat is detachably circumferentially limited to the pump cover.

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