Shaft gear grinding, tensioning and positioning device
By designing the wedge block and tensioning block of the shaft gear grinding tensioning positioning device, the high-precision problem of outer circle grinding of electric drive shaft parts is solved, realizing high-precision outer circle machining and surface quality improvement, and meeting the assembly requirements of electric drive reducers for new energy vehicles.
Patent Information
- Application Number
- CN202422639965.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-29
AI Technical Summary
How to achieve high-precision machining of the outer diameter of electric drive shaft parts, ensuring high precision requirements for outer diameter dimensions, cylindricity, roundness and roughness, while avoiding twisting and vibration during the grinding process, to meet the assembly requirements of electric drive reducers for new energy vehicles.
A tensioning and positioning device for grinding shaft-type gears was designed. Through the cooperation of wedge blocks and tensioning blocks, a tight fit is achieved between the inner holes of shaft-type parts, enhancing the positioning rigidity of the grinding process and ensuring the accuracy and surface quality of the outer diameter machining.
It improves the machining accuracy, cylindricity, and roundness of the outer diameter of shaft parts, meeting the accuracy requirements of 0.005mm and 0.003mm, respectively, reducing NVH problems and ensuring the high precision and stability of the products.
Smart Images
Figure CN223492238U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical processing technology, specifically relating to a shaft gear grinding tensioning and positioning device. Background Technology
[0002] With the continuous development of new energy vehicles, the requirements for the outer diameter precision of shaft components in electric drive reducers of new energy vehicles are getting higher and higher. The outer diameter dimensional tolerance is gradually increasing to within 0.009mm, the outer diameter roughness needs to be stably guaranteed to Rz4, the cylindricity needs to be stably guaranteed to be within 0.007mm, and the roundness needs to be stably guaranteed to be within 0.004mm. Grinding the outer diameter is not allowed to have problems such as torsion, vibration, and burning.
[0003] High-precision external cylindrical grinding is required to reduce NVH (noise, vibration, and harshness) in the EOL (Exhaust Hour) test of the product after bearing assembly. Therefore, how to consistently ensure the external cylindrical grinding accuracy of electric drive shaft components and improve the surface finish of the products has become a technical issue that manufacturers need to study. Summary of the Invention
[0004] In view of the shortcomings of the above-mentioned background technology, the purpose of this utility model is to provide a shaft gear grinding tensioning and positioning device, which improves the high precision of the outer diameter grinding dimension of electrically driven shaft parts and the requirements of cylindricity, roundness, runout, roughness and other aspects of the outer diameter surface, and reduces the NVH value of the assembly EOL test.
[0005] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows:
[0006] A shaft-type gear grinding tensioning and positioning device includes a base, a pull rod inserted in the middle of the base, a wedge block connected to the front end of the pull rod, and a wedge pit formed by the concave outer surface of the front end of the wedge block.
[0007] It also includes a clamping assembly; the clamping assembly includes an upper support body, the upper support body is hollow in the middle, the upper support body is connected and fixed to the base, and a positioning block is passed through the front end of the upper support body; the outer surface of the positioning block is recessed to form an annular first groove, the outer surface of the positioning block is provided with a first positioning hole, a tensioning block is placed in the first positioning hole, a clamping ring is fitted into the first groove, and the clamping ring is wrapped around the tensioning block; the bottom surface of the tensioning block is a slope.
[0008] The front end of the wedge block is inserted into the positioning block, and the inclined surface of the tensioning block is in contact with the wedge-shaped pit; the positioning block is inserted into the inner wall of the part.
[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the base is frustum-shaped, and bolts pass through the base to connect with the machine tool;
[0010] The front end of the pull rod is provided with two opposing first blocks with a cross section of 7; the rear end of the wedge block protrudes with a second block, which is inserted between the two first blocks to form a cross stack; the pull rod and the wedge block are inserted together into the interior of the base.
[0011] Based on the above scheme and as a preferred option: bolts pass through the upper support body and are connected and fixed to the base; a rubber block is fitted on the wedge block.
[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the positioning block is cylindrical; the outer surface of the tensioning block is recessed in the middle to form a second groove, and the clamping ring is inserted into the second groove.
[0013] Based on the above scheme and as a preferred embodiment of the above scheme: the surface of the positioning block is provided with three first positioning holes, the angle between the three first positioning holes is 120 degrees, and tensioning blocks are placed in the three positioning holes respectively.
[0014] Based on the above scheme and as a preferred embodiment of the above scheme: the outer surface of the tensioning block is recessed to form a first limiting pit; the limiting bolt is screwed into the positioning block and inserted into the first limiting hole.
[0015] The outstanding and beneficial technical effects of this utility model compared to the prior art are:
[0016] Compared with existing technologies, the shaft gear grinding tensioning and positioning device of this utility model has the following advantages.
[0017] The base has an internal pull rod. The front end of the pull rod drives the wedge block to move back and forth. The front end of the wedge block has a wedge shape, which is a slope with high ends and low middle. The wedge block is inserted into the upper support body. The tension block is inserted into the positioning block and is attached to the wedge pit. The clamping ring is wrapped around the tension block. The wedge block moves forward and backward, lifting the tension block and expanding it outward.
[0018] At the tensioning joint of shaft parts and devices, a wedge-shaped drive tensioning block design is adopted to ensure that the inner hole can fit tightly under the positioning of the center hole, and to increase the machining positioning rigidity of the grinding outer circle, so as to ensure the high precision requirements of the outer circle dimensions and texture.
[0019] In summary, the structure of this utility model can meet the high-precision grinding requirements of shaft parts, improve surface roughness and accuracy assurance, and meet the precision design requirements of new energy gear shafts. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model.
[0021] Figure 2 yes Figure 1 A magnified schematic diagram of the local X-axis structure.
[0022] Figure 3 This is a schematic cross-sectional view of the overall structure of this utility model.
[0023] Figure 4 This is a schematic diagram of the overall structure of this utility model.
[0024] Reference numerals: Base 01; Pull rod 02; First stop block 020; Wedge block 03; Wedge recess 030; Second stop block 031; Rubber block 032; Clamp assembly 04; Upper support body 040; Positioning block 041; First slot 0410; First positioning hole 0411; Clamping ring 042; Tensioning block 043; Second slot 0430; First limiting recess 0431; Limiting bolt 0432; Part 10; Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments;
[0026] This embodiment provides a tensioning and positioning device for grinding shaft-type gears, including a base 01. The base 01 is a universal type with a 6x60° indexing that is connected to the worktable. A pull rod 02 is inserted into the middle of the base 01. A wedge block 03 is connected to the front end of the pull rod 02. The outer surface of the front end of the wedge block 03 is recessed to form a wedge-shaped pit 030. The pull rod 02 drives the wedge block 03 to move back and forth.
[0027] It also includes a clamping assembly 04; the clamping assembly 04 includes an upper support body 040, the upper support body 040 is hollow in the middle, the upper support body 040 is connected and fixed to the base 01, and the upper support body 040 covers the wedge-shaped block 03; a positioning block 041 is passed through the front end of the upper support body 040, and the positioning block 041 is integrally formed on the upper support body 040; the outer surface of the positioning block 041 is recessed to form an annular first groove 0410, and a first positioning hole 0411 is opened on the outer surface of the positioning block 041. A tensioning block 043 is placed in the first positioning hole 0411, and a clamping ring 042 is fitted into the first groove 0410. The clamping ring 042 is wrapped around the tensioning block 043; the bottom surface of the tensioning block 043 is a slope.
[0028] The first positioning hole 0411 communicates with the interior of the positioning block 041; the tensioning block 043 is a block of metal, and the clamping ring 042 is made by riveting the two ends of a metal ring; the tensioning block 043 has a movement allowance of 1-5 mils in the first positioning hole 0411.
[0029] The front end of the wedge block 03 is inserted into the positioning block 041, and the inclined surface of the tensioning block 043 is in contact with the wedge-shaped pit 030; the positioning block 041 is inserted into the inner wall of the part 10. The wedge-shaped pit 030 is a slope that is high at both ends and low in the middle, and it is in contact with the inclined surface of the tensioning block 043. The movement of the wedge block 03 causes the tensioning block 043 to move.
[0030] As described above, during use, the base 01 is positioned by engaging with the equipment mounting surface; during processing, the pneumatic pull rod 02 is pulled back, causing the wedge block 03 to tighten and the tension block 043 to expand outward, thereby tightening the inner wall of the inner hole of the shaft part 10. This increases the rigidity of the processed product, enabling it to meet the requirements for high-precision dimensions, roundness, cylindricity, and surface texture, thus reducing the probability of high NVH during the assembly EOL test.
[0031] Actual processing verification shows that using this design device, the outer diameter of the shaft-type parts 10 at the input and output ends of electric drives can stably meet the processing requirements within 0.013mm, the cylindricity can meet within 0.005mm, and the roundness can meet the accuracy requirements of 0.003mm. Moreover, there are no twist marks or vibration marks after processing, and the surface roughness can reach below Rz4um.
[0032] The table shows the statistical data after verifying the machining process using this fixture.
[0033]
[0034] Furthermore, the base 01 is frustum-shaped, and bolts pass through the base 01 to connect with the machine tool; the fixture base 01 at the connection with the equipment base 01 is a universal quick-change design, which can reduce fixture costs and manufacturing cycle.
[0035] The front end of the pull rod 02 is provided with two opposing first blocks 020 with a cross section of 7; the rear end of the wedge block 03 has a second block 031 protruding from it, and the second block 031 is inserted between the two first blocks 020 to form a cross stack; the pull rod 02 and the wedge block 03 are inserted together into the interior of the base 01.
[0036] As described above, the second stop 031 of the wedge block 03 is inserted between the first stop 020 of the pull rod 02 and then covered by the upper support body 040, so as to realize the back-and-forth movement of the wedge block 03;
[0037] Furthermore, bolts pass through the upper support 040 and are connected and fixed to the base 01; this facilitates disassembly and assembly.
[0038] A rubber block 032 is fitted onto the wedge block 03.
[0039] As mentioned above, the rubber block 032 provides support and limits the movement of the wedge block 03, making the movement of the wedge block 03 smoother.
[0040] Furthermore, the positioning block 041 is cylindrical; the outer surface of the tensioning block 043 has a recess in the middle to form a second groove 0430, and the clamping ring 042 is inserted into the second groove 0430.
[0041] As described above, the cylindrical positioning hole can accommodate the inner wall of more parts 10, making insertion more convenient; the clamping ring 042 is inserted into the second slot 0430 on the tensioning block 043, which has a protective effect and prevents the clamping ring 042 from being damaged by repeated compression over a long period of time.
[0042] Furthermore, the surface of the positioning block 041 is provided with three first positioning holes 0411, the angle between the three first positioning holes 0411 is 120 degrees, and tensioning blocks 043 are placed in the three positioning holes respectively.
[0043] As described above, the three tensioning blocks 043 surround the part in a 360-degree arrangement, ensuring uniform tension and stable rotational processing of the part 10.
[0044] Furthermore, the outer surface of the tensioning block 043 is recessed to form a first limiting pit 0431; the limiting bolt 0432 is screwed into the positioning block 041 and inserted into the first limiting hole.
[0045] As described above, the limiting bolt 0432 is inserted into the first limiting hole to limit the tensioning block 043, preventing the tensioning block 043 from dislodging from the first positioning block 041, while not affecting the movement of the tensioning block 043 inward or outward.
[0046] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component 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 utility model.
[0047] 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 technical features indicated. In this utility model, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection.
[0048] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. A tensioning and positioning device for grinding shaft-type gears, characterized in that: Includes a base, with a pull rod inserted in the middle of the base, and a wedge-shaped block connected to the front end of the pull rod. The outer surface of the front end of the wedge-shaped block is recessed to form a wedge-shaped pit. It also includes a clamping assembly; the clamping assembly includes an upper support body, the upper support body is hollow in the middle, the upper support body is connected and fixed to the base, and a positioning block is passed through the front end of the upper support body; the outer surface of the positioning block is recessed to form an annular first groove, the outer surface of the positioning block is provided with a first positioning hole, a tensioning block is placed in the first positioning hole, a clamping ring is fitted into the first groove, and the clamping ring is wrapped around the tensioning block; the bottom surface of the tensioning block is a slope. The front end of the wedge block is inserted into the positioning block, and the inclined surface of the tensioning block is in contact with the wedge-shaped pit; the positioning block is inserted into the inner wall of the part.
2. The shaft gear grinding tensioning and positioning device according to claim 1, characterized in that: The base is shaped like a frustum, and bolts pass through the base to connect it to the machine tool. The front end of the pull rod is provided with two opposing first blocks with a cross section of 7; the rear end of the wedge block protrudes with a second block, which is inserted between the two first blocks to form a cross stack; the pull rod and the wedge block are inserted together into the interior of the base.
3. The shaft gear grinding tensioning and positioning device according to claim 2, characterized in that: Bolts pass through the upper support body and are connected and fixed to the base; A rubber block is fitted onto the wedge-shaped block.
4. The shaft gear grinding tensioning and positioning device according to claim 1, characterized in that: The positioning block is cylindrical; the outer surface of the tensioning block is recessed in the middle to form a second groove, and the clamping ring is inserted into the second groove.
5. The shaft gear grinding tensioning and positioning device according to claim 4, characterized in that: The surface of the positioning block has three first positioning holes, the angle between the three first positioning holes is 120 degrees, and tensioning blocks are placed in the three positioning holes respectively.
6. The shaft gear grinding tensioning and positioning device according to claim 4, characterized in that: The outer surface of the tensioning block is recessed to form the first limiting pit; the limiting bolt is screwed into the positioning block and inserted into the first limiting hole.