An aid for assembling a bearing bushing
Patent Information
- Application Number
- CN202521520058.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-07-21
AI Technical Summary
[0010]针对现有技术的不足，本实用新型提供了一种用于装配轴承衬套的辅具，解决压装过程中轴承衬套外径与机油泵盖内孔难以保持同心，导致压入后受力不均匀，内孔圆柱度超差，机油泵盖支撑基准面缺乏刚性支撑，压装时易变形，同时压装工具无导向结构，使轴承衬套径向受力不均，人工对准和调整过程繁琐，依赖操作人员技能，难以实现快速精准装配，且装配质量稳定性差的问题
[0016]1. By matching the outer diameter of the bearing bushing fixture with the inner hole of the bearing bushing, and by guiding the guide nut with the inner hole of the oil pump cover, a high degree of concentricity between the outer diameter of the bearing bushing and the inner hole of the oil pump cover is ensured during the pressing process. This avoids uneven force distribution after the bearing bushing is pressed in due to misalignment, thus effectively preventing the cylindricity of the inner hole from exceeding the tolerance. The mounting support plate of the pressing bushing positioning base uses the large plane of the oil pump cover as the support reference surface, reducing the degree of deformation of the cover during assembly. At the same time, the guidance of the guide nut and the positioning of the pressing bushing fixture during the pressing process ensure that the radial force on the bearing bushing is uniform when it is pressed in, further guaranteeing the assembly quality.
Smart Images
Figure CN224659182U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mechanical assembly technology, and in particular to an auxiliary tool for assembling bearing bushings. Background Technology
[0002] In the field of mechanical assembly technology, auxiliary tools used for assembling bearing bushings are mainly used to press-fit thin-walled bearing bushings into the inner hole of the oil pump cover. In traditional assembly processes, the oil pump cover has a complex structure, and different placement orientations during press-fitting can lead to varying degrees of deformation under stress, resulting in uneven stress on the bearing bushing after pressing, and causing the inner hole's cylindricity to exceed tolerances. Furthermore, as a thin-walled component, the bearing bushing's outer diameter is interference-fitted with the cover's inner hole; uneven radial extrusion pressure or misalignment between the outer diameter and the cover's inner hole during press-fitting can also lead to excessive cylindricity of the inner hole.
[0003] Currently, some manufacturers typically use assembly methods that rely on manual alignment or simple tooling, mainly involving the following structures:
[0004] 1. Support platform: Used to place the oil pump cover, but lacks precise positioning of the cover's mounting reference surface, making it difficult to control its deformation under stress.
[0005] 2. Press-fitting tool: It acts directly on the bearing bushing, lacks a guiding structure, and cannot guarantee coaxiality during the press-fitting process.
[0006] 3. Positioning block: Simply fixes the bearing bushing without considering the requirement for uniform force distribution on thin-walled parts.
[0007] To improve assembly precision, some manufacturers have tried the following methods:
[0008] The oil pump cover is supported by a common flat plate and its position is adjusted manually. However, it is difficult to guarantee the accuracy of the support datum of the large flat surface, which can easily lead to bending and deformation of the cover during press-fitting. The bearing bushing is directly press-fitted using a pressure rod without a guide structure, which relies on the operator's experience to control the press-fitting direction. The coaxiality error is large. When pre-positioning the bearing bushing, the clearance between it and the press-fitting tool is not considered, resulting in uneven radial force during press-fitting.
[0009] However, the above-mentioned implementation still has the following problems: during the press-fitting process, it is difficult to keep the outer diameter of the bearing bushing and the inner hole of the oil pump cover concentric, resulting in uneven force after pressing, excessive cylindricity of the inner hole, lack of rigid support for the oil pump cover support reference surface, easy deformation during press-fitting, and the lack of a guide structure in the press-fitting tool, which makes the radial force on the bearing bushing uneven. The manual alignment and adjustment process is cumbersome, depends on the operator's skills, and is difficult to achieve fast and accurate assembly. Moreover, the assembly quality stability is poor. In view of the above problems, this application proposes an auxiliary tool for assembling bearing bushings. Through the cooperation of the press-fitting positioning base, the press-fitting bushing auxiliary tool and the guide nut, the concentric press-fitting of the bearing bushing and the inner hole of the oil pump cover is achieved, ensuring uniform force and improving assembly efficiency and quality. Utility Model Content
[0010] To address the shortcomings of existing technologies, this utility model provides an auxiliary tool for assembling bearing bushings. It solves the problems of difficulty in keeping the outer diameter of the bearing bushing and the inner hole of the oil pump cover concentric during the press-fitting process, resulting in uneven force after pressing, excessive cylindricity of the inner hole, lack of rigid support on the oil pump cover support reference surface, easy deformation during press-fitting, lack of guiding structure in the press-fitting tool, uneven radial force on the bearing bushing, cumbersome manual alignment and adjustment process, reliance on operator skills, difficulty in achieving fast and accurate assembly, and poor assembly quality stability.
[0011] To achieve the above objectives, this utility model provides the following technical solution:
[0012] An auxiliary tool for assembling bearing bushings includes a bushing positioning base, a bushing support tool one, two bushing support tools two, and a set of guide nuts. The bushing positioning base supports an oil pump cover. A support plate is provided on the upper surface of the bushing positioning base. The thickness of the set of guide nuts is less than the thickness of the support plate. The support plate is machined with blind holes with a diameter larger than the mounting hole diameter of the oil pump cover, and is used to place the oil pump cover and make its large flat surface serve as the mounting support reference surface. The bushing support tool one and the two bushing support tools two are used to position the bearing bushing. The outer diameters of the bushing support tool one and the two bushing support tools two are all fitted with the inner hole of the bearing bushing.
[0013] Preferably, a set of guide nuts is used to guide the oil pump cover inner hole. The thread specification and outer diameter of the set of guide nuts are reasonably designed with respect to the gap between the inner hole of the oil pump cover and the inner hole. The materials of the pressure sleeve auxiliary tool one, the two pressure sleeve auxiliary tools two and the set of guide nuts are all 45 steel and have been heat treated.
[0014] Preferably, the outer diameter of the two pressure sleeve accessories is 38-0.05mm, the outer diameter of the first pressure sleeve accessory is 30-0.05mm, and a set of guide nuts can be screwed into the pressure sleeve accessories to fit with the inner hole of the oil pump cover to guide the press-fit of the bearing bushing. The parallelism of the mounting support plate of the pressure sleeve positioning base is 0.04mm. When placed at the center of the hydraulic press worktable, the inner hole of the oil pump cover and the center of the through hole of the support plate can be concentric.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] 1. By matching the outer diameter of the bearing bushing fixture with the inner hole of the bearing bushing, and by guiding the guide nut with the inner hole of the oil pump cover, a high degree of concentricity between the outer diameter of the bearing bushing and the inner hole of the oil pump cover is ensured during the pressing process. This avoids uneven force distribution after the bearing bushing is pressed in due to misalignment, thus effectively preventing the cylindricity of the inner hole from exceeding the tolerance. The mounting support plate of the pressing bushing positioning base uses the large plane of the oil pump cover as the support reference surface, reducing the degree of deformation of the cover during assembly. At the same time, the guidance of the guide nut and the positioning of the pressing bushing fixture during the pressing process ensure that the radial force on the bearing bushing is uniform when it is pressed in, further guaranteeing the assembly quality.
[0017] 2. The auxiliary tool has a reasonable structural design, which allows operators to assemble bearing bushings conveniently, accurately and quickly without complicated adjustment processes, greatly improving assembly efficiency and reducing labor intensity. The bearing bushing auxiliary tool and guide nut are made of 45 steel and have undergone heat treatment, and there are strict requirements for their dimensional tolerances and coaxiality. At the same time, the mounting support plate has a high degree of parallelism. All of these provide a reliable guarantee for ensuring the assembly accuracy of the bearing bushing. Attached Figure Description
[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0019] Figure 1 This is an overall structural diagram of the present invention;
[0020] Figure 2 This is a top view of the entire utility model.
[0021] Illustration: 1. Pressure sleeve positioning base; 2. Pressure sleeve auxiliary tool two; 3. Guide nut; 4. Pressure sleeve auxiliary tool one. Detailed Implementation
[0022] This application provides an auxiliary tool for assembling bearing bushings, effectively solving the problems of uneven force distribution after pressing, excessive cylindricity of the inner hole, lack of rigid support for the oil pump cover support surface, easy deformation during pressing, uneven radial force distribution of the bearing bushing due to the lack of a guiding structure in the pressing tool, cumbersome manual alignment and adjustment process, reliance on operator skills, difficulty in achieving fast and accurate assembly, and poor assembly quality stability. By cooperating with the pressing bushing positioning base, the pressing bushing auxiliary tool, and the guide nut, concentric pressing of the bearing bushing and the inner hole of the oil pump cover is achieved, ensuring uniform force distribution and improving assembly efficiency and quality.
[0023] Example
[0024] like Figure 1and Figure 2 As shown, the technical solution in this application embodiment effectively solves the technical problems of the bearing bushing's outer diameter and the oil pump cover's inner hole being difficult to keep concentric during the press-fitting process, resulting in uneven force after press-fitting, excessive cylindricity of the inner hole, lack of rigid support on the oil pump cover's support reference surface, easy deformation during press-fitting, and the lack of a guiding structure in the press-fitting tool, leading to uneven radial force on the bearing bushing. Furthermore, the manual alignment and adjustment process is cumbersome, relies on operator skills, makes it difficult to achieve fast and accurate assembly, and results in poor assembly quality stability. The overall approach is as follows:
[0025] To address the problems existing in the prior art, this utility model provides an auxiliary tool for assembling bearing bushings, including a bushing positioning base 1, a bushing auxiliary tool one 4, two bushing auxiliary tools two 2, and a set of guide nuts 3. The bushing positioning base 1 is used to support the oil pump cover. A support plate is provided on the upper surface of the bushing positioning base 1. The thickness of the set of guide nuts 3 is less than the thickness of the mounting support plate. The mounting support plate is machined with blind holes with a diameter larger than the mounting hole diameter of the oil pump cover, and is used to place the oil pump cover and make its large flat surface serve as the mounting support reference surface. The bushing auxiliary tool one 4 and the two bushing auxiliary tools two 2 are used to position the bearing bushing. The outer diameter of the bushing auxiliary tool one 4 and the two bushing auxiliary tools two 2 are all matched with the inner hole of the bearing bushing. A mounting support plate with a parallelism of 0.04mm is prepared, and its thickness is greater than the thickness of the guide nuts 3. It is machined with three blind holes with a diameter larger than the mounting hole diameter of the oil pump cover. It is placed at the center of the hydraulic press worktable to inspect the bushing auxiliary tools (including bushing auxiliary tool one 4 and two bushing auxiliary tools two 2). Check that the dimensions and coaxiality of the guide nut 3 meet the requirements, ensuring that its material is 45 steel and has undergone heat treatment, with no sharp edges on the surface. Place the large flat surface of the oil pump cover on the mounting support plate, making the inner hole of the cover and the center of the through hole of the support plate basically concentric. Use the large flat surface as the mounting support reference surface to prevent insufficient rigidity during assembly from causing bending and excessive deflection of the plane where the mounting hole is located. Fit the inner hole of the bearing bushing to be assembled onto the outer diameter of the bushing fixture, ensuring a tight fit. Screw in the guide nut 3 and tighten it. To ensure a secure connection between the guide nut 3 and the pressure sleeve accessory, place the pressure sleeve accessory containing the bearing bushing and guide nut 3 into the corresponding inner hole of the oil pump cover, ensuring that the guide nut 3 and the inner hole of the oil pump cover are correctly matched. Start the hydraulic press and squeeze the large end face of the pressure sleeve accessory. Through the guiding action of the guide nut 3, the bearing bushing is smoothly pressed into the designated position in the inner hole of the oil pump cover. After pressing into place, stop the hydraulic press, remove the guide nut 3 and the pressure sleeve accessory, and complete the assembly of the bearing bushing in the inner hole of the oil pump cover.
[0026] A set of guide nuts 3 is used to guide the oil pump cover's inner hole. The thread specifications and outer diameter of the guide nuts 3 are reasonably designed to match the inner hole of the oil pump cover. The materials of the pressure sleeve auxiliary tool 1 4, the two pressure sleeve auxiliary tools 2, and the set of guide nuts 3 are all 45 steel and have undergone heat treatment. The outer diameter of the two pressure sleeve auxiliary tools 2 is 38-0.05mm, and the outer diameter of the pressure sleeve auxiliary tool 1 4 is 30-0.05mm. After the set of guide nuts 3 are screwed into the pressure sleeve auxiliary tool, they can match the inner hole of the oil pump cover to guide the press-fitting of the bearing bush. The parallelism of the mounting support plate of the pressure sleeve positioning base 1 is 0.04mm. When placed at the center of the hydraulic press's worktable, it ensures that the inner hole of the oil pump cover is concentric with the center of the through hole of the support plate. Through the matching of the outer diameter of the pressure sleeve auxiliary tool with the inner hole of the bearing bush, and the matching guidance of the guide nuts 3 with the inner hole of the oil pump cover, it is ensured that the outer diameter of the bearing bush is aligned with the inner hole of the oil pump cover during the press-fitting process. The pump cover inner hole maintains a high degree of concentricity to avoid uneven force distribution after the bearing bushing is pressed in due to misalignment, thus effectively preventing excessive cylindricity of the inner hole. The mounting support plate of the pressure sleeve positioning base 1 uses the large plane of the oil pump cover as the support reference surface, reducing the degree of deformation of the cover during assembly. At the same time, the guide nut 3 and the positioning of the pressure sleeve auxiliary tool during the pressing process ensure that the bearing bushing is subjected to uniform radial force during pressing, further guaranteeing the assembly quality. The auxiliary tool has a reasonable structural design, allowing operators to assemble the bearing bushing conveniently, accurately, and quickly without complicated adjustment processes, greatly improving assembly efficiency and reducing labor intensity. Both the pressure sleeve auxiliary tool and the guide nut 3 are made of 45 steel and have undergone heat treatment, with strict requirements on their dimensional tolerances and coaxiality. In addition, the mounting support plate has a high degree of parallelism, all of which provide a reliable guarantee for ensuring the assembly accuracy of the bearing bushing.
[0027] Working principle:
[0028] Prepare a mounting support plate with a parallelism of 0.04mm and a thickness greater than that of the guide nut 3. It should also have three blind holes with a diameter larger than the mounting hole of the oil pump cover. Place the plate at the center of the hydraulic press table. Check the dimensional accuracy and coaxiality of the pressure sleeve accessories (including pressure sleeve accessory 1 4 and two pressure sleeve accessories 2) and the guide nut 3 to ensure they meet the requirements. Ensure the material is 45 steel and has undergone heat treatment, with no sharp edges. Place the large flat surface of the oil pump cover on the mounting support plate, making the inner hole of the cover approximately concentric with the center of the through hole in the support plate. Use the large flat surface as the mounting support reference plane. To prevent insufficient rigidity during assembly from causing excessive deflection due to bending of the plane containing the mounting hole, the inner hole of the bearing bushing to be assembled is inserted into the outer diameter of the pressure sleeve fixture, ensuring a tight fit. The guide nut 3 is screwed in and tightened to secure the guide nut 3 to the pressure sleeve fixture. The pressure sleeve fixture, containing the bearing bushing and guide nut 3, is then placed into the corresponding inner hole of the oil pump cover, ensuring the guide nut 3 correctly aligns with the inner hole of the oil pump cover. The hydraulic press is started, pressing the large end face of the pressure sleeve fixture. Guided by the guide nut 3, the bearing bushing is smoothly pressed into the designated position within the inner hole of the oil pump cover, ensuring it is in place. Afterwards, the hydraulic press is stopped, the guide nut 3 and the pressure sleeve auxiliary tool are disassembled, and the assembly of the bearing bushing in the inner hole of the oil pump cover is completed. Through the fit between the outer diameter of the pressure sleeve auxiliary tool and the inner hole of the bearing bushing, and the guide nut 3 and the inner hole of the oil pump cover, it is ensured that the outer diameter of the bearing bushing and the inner hole of the oil pump cover maintain a high degree of concentricity during the press-fitting process. This avoids uneven force distribution after the bearing bushing is pressed in due to misalignment, thus effectively preventing the inner hole cylindricity from exceeding the tolerance. The mounting support plate of the pressure sleeve positioning base 1 uses the large plane of the oil pump cover as the support reference surface, reducing the degree of deformation of the cover during assembly. Simultaneously, the press-fitting... During the process, the guide nut 3 and the positioning of the bearing bushing auxiliary tool ensure that the radial force is uniform when the bearing bushing is pressed in, further guaranteeing the assembly quality. The auxiliary tool has a reasonable structural design, allowing operators to assemble the bearing bushing conveniently, accurately, and quickly without complicated adjustment processes, greatly improving assembly efficiency and reducing labor intensity. Both the bearing bushing auxiliary tool and the guide nut 3 are made of 45 steel and have undergone heat treatment, with strict requirements on their dimensional tolerances and coaxiality. At the same time, the mounting support plate has a high degree of parallelism, all of which provide a reliable guarantee for ensuring the assembly accuracy of the bearing bushing.
[0029] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. An auxiliary tool for assembling bearing bushings, characterized in that, It includes a pressure sleeve positioning base (1), a pressure sleeve auxiliary tool one (4), two pressure sleeve auxiliary tools two (2) and a set of guide nuts (3); the pressure sleeve positioning base (1) is used to support the oil pump cover, and a support plate is provided on the upper surface of the pressure sleeve positioning base (1), and the thickness of the set of guide nuts (3) is less than the thickness of the support plate. Among them, the mounting support plate is machined with a blind hole with a diameter larger than that of the oil pump cover mounting hole, and is used to place the oil pump cover and make its large flat surface as the mounting support reference surface. The first pressure bushing auxiliary tool (4) and the two second pressure bushing auxiliary tools (2) are used to position the bearing bushing.
2. The auxiliary tool for assembling bearing bushings as described in claim 1, characterized in that: The outer diameters of the first (4) and the two second (2) bearing bushing accessories are all fitted with the inner hole of the bearing bushing.
3. The auxiliary tool for assembling bearing bushings as described in claim 1, characterized in that: A set of guide nuts (3) is used to guide the oil pump cover inner hole.
4. The auxiliary tool for assembling bearing bushings as described in claim 1, characterized in that: The thread specifications, outer diameter and clearance between the guide nut (3) and the inner hole of the oil pump cover are reasonably designed.
5. The auxiliary tool for assembling bearing bushings as described in claim 1, characterized in that: The materials of the first pressure bushing accessory (4), the two second pressure bushing accessories (2) and the set of guide nuts (3) are all 45 steel and have been heat-treated.
6. The auxiliary tool for assembling bearing bushings as described in claim 1, characterized in that: The outer diameter of the two pressure bushing accessories (2) is 38-0.05 mm; The outer diameter of the pressure bushing accessory (4) is 30-0.05 mm.
7. The auxiliary tool for assembling bearing bushings as described in claim 1, characterized in that: After a set of guide nuts (3) are screwed into the pressure bushing accessory, they can fit with the inner hole of the oil pump cover to guide the press-fit of the bearing bushing.
8. The auxiliary tool for assembling bearing bushings as described in claim 1, characterized in that: The parallelism of the mounting support plate of the pressure sleeve positioning base (1) is 0.04mm. When placed at the center of the hydraulic press workbench, the inner hole of the oil pump cover and the center of the through hole of the support plate can be concentric.