Positioning device for grinding outer circle of internal spline of internal support input shaft
Through the inner spline grinding of the outer circle positioning device of the inner spline, the reference of the inner spline is transferred to the positioning body, which solves the problem of the lower coaxiality of the inner spline after heat treatment, and realizes high-precision coaxial processing of the outer circle and the inner spline.
Patent Information
- Application Number
- CN202422417568.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-08
AI Technical Summary
After the input shaft heat treatment, the coaxiality of the inner spline and the central hole is reduced, resulting in the coaxiality of the outer circle and the inner spline that cannot meet the part production requirements. Traditional methods cannot effectively ensure that the reference of the inner spline is converted into an external circle processing reference.
The inner spline grinding of the outer circle positioning device of the inner support input shaft is adopted, including the positioning body and the expansion sleeve. By expanding the sleeve, the reference of the inner spline is transferred to the first cone of the positioning body, and clamped with the positioning hole A and the positioning hole B to ensure the coaxiality of the outer circle and the inner spline.
The machining requirement of the coaxiality of the outer circle and inner spline of the input shaft is less than 0.03mm, and the detection accuracy and machining accuracy of the parts are improved.
Smart Images
Figure CN223146891U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an internal spline machining positioning device, in particular to an internal support input shaft internal spline grinding outer circle positioning device. Background Technique
[0002] The input shaft is a core component in the current new energy coaxial gearbox. As shown in Figure 2 , the internal spline is directly connected to the external spline of the motor shaft. With the increasing speed of the current motor, in order to avoid the low-order NVH problems caused by ultra-high speed, major vehicle manufacturers have higher and higher requirements for the accuracy of the internal spline of the input shaft connected to the motor shaft. Some require a maximum runout requirement of 0.03 mm (with the two bearing positions as the reference, such as Figure 2 reference A and reference B).
[0003] It should be noted that during the internal spline machining process, the internal spline of the input shaft is first broached (with the shaft shoulder as the reference). After the internal spline is machined, the input shaft is then heat-treated, and the internal spline is no longer machined. After heat treatment, the input shaft will have a certain thermal deformation. At this time, the original center holes at both ends of the input shaft will deviate in position, and the coaxiality with the internal spline cannot be effectively guaranteed. If the outer edge of the input shaft is still ground with the center holes at both ends of the input shaft as the reference, the coaxiality between the ground outer circle and the internal spline of the input shaft will not meet the part production requirements (the coaxiality between the internal spline and the center hole will be greater than 0.03 mm) due to error accumulation.
[0004] Therefore, it is necessary to convert the reference of the internal spline into the input shaft reference when machining the outer circle to ensure the coaxiality between the machined outer circle of the input shaft and the internal spline. Content of the Utility Model
[0005] The purpose of the utility model is to provide an internal support input shaft internal spline grinding outer circle positioning device to solve the problem of low coaxiality between the inner and outer parts of the existing internal spline.
[0006] To achieve the above purpose, the utility model provides the following technical solutions:
[0007] An internal support input shaft internal spline grinding outer circle positioning device includes
[0008] a positioning body, the positioning body includes a first cone coaxial with the internal spline, the maximum outer diameter of the first cone is smaller than the inner diameter of the internal spline, the left side of the first cone is coaxially connected with an extension section, a positioning hole A is coaxially opened on the left end face of the extension section, the right side of the first cone is coaxially connected with a threaded section, and a positioning hole B is coaxially arranged on the end face of the threaded section;
[0009] a swelling sleeve, coaxially sleeved on the first cone;
[0010] The threaded cap is screwed onto the threaded section and applies a uniform axial thrust to the expansion sleeve during rotation.
[0011] Preferably, the clearance between the outer edge of the expansion sleeve and the inner diameter of the internal spline is 0.1 mm.
[0012] Preferably, the taper of the first cone is 10-12°.
[0013] Preferably, the extension section has a second cone connected to the extension section. The second cone is coaxial with the first cone, and the outer diameter of the second cone is larger than the inner hole diameter of the input shaft.
[0014] Preferably, the second cone has at least two stages, and the outer diameter gradually increases from the side close to the first cone to the side far from the cone.
[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0016] In this solution, the expansion sleeve is tightened inside the inner diameter so that the expansion sleeve and the internal spline can maintain coaxiality. During the tightening process of the expansion sleeve, the expansion sleeve also maintains a coaxial relationship with the first cone. At this time, the internal spline, the expansion sleeve, and the first cone maintain a high degree of coaxiality after the expansion sleeve is tightened, and the axis reference of the internal spline is accurately transferred to the first cone. It should be noted that because the first cone and the extension section, the threaded section, and the second cone connected to it all maintain a coaxial relationship. Therefore, the center reference of the internal spline can be accurately transferred to the positioning holes A and B at both ends of the positioning body. Subsequently, the worker only needs to align and clamp the positioning holes A and B to ensure that the outer circle with high coaxiality with the internal spline can be ground. Description of the Drawings
[0017] Figure 1 is a schematic structural diagram of the present utility model;
[0018] Figure 2 is a schematic diagram of the input shaft used in this solution for processing.
[0019] Reference Numerals:
[0020] 1. Positioning body 11. First cone 12. Extension section 13. Positioning hole A 14. Threaded section 15. Positioning hole B 16. Second cone 2. Expansion sleeve 3. Threaded cap 4. Input shaft. Detailed Embodiments
[0021] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0024] It should be noted that before understanding this solution, it is first necessary to explain the parts targeted by this solution: the input shaft on the automotive transmission, and the technical problems existing in its processing process: after the internal spline of the traditional input shaft is processed, heat treatment is required. After the heat treatment, there will be thermal deformation between the positioning holes at both ends of the input shaft and the center of the internal spline, resulting in a decrease in the concentricity between the original two center holes and the inner hole of the internal spline. Although the deformation amount of the input shaft is relatively small in the later stage of heat treatment, when processing the outer circle of the input shaft, if the two center holes A and B with already deviated positions are used as the direct reference, the coaxiality between the outer circle and the internal spline cannot meet the existing technical requirements. Therefore, it is necessary to develop a structure that directly converts the reference of the internal spline into the reference for outer circle processing during the processing process.
[0025] As Figure 1 shown, an inner support input shaft internal spline grinding outer circle positioning device includes a positioning body 1, and the positioning body is composed of the following parts. Specifically, it includes a first cone 11, an extension section 12, a threaded section 13, a positioning hole A13 opened on the end face of the extension section, and a positioning hole B15 opened on the end face of the threaded section.
[0026] It should be noted that in this solution, the maximum outer diameter of the first cone 11 is smaller than the inner diameter of the internal spline of the input shaft, so as to be able to smoothly penetrate into the input shaft 4. At the same time, the extension section 12 is coaxially connected to the first cone, so that when the first cone and the internal spline are coaxial, the extension section and the internal spline are also coaxial synchronously. Similarly, the threaded section 13 in this solution also maintains a coaxial relationship with the first cone, so as to be able to be coaxial with the internal spline synchronously when the first cone and the internal spline are coaxial. It should be noted that in order to facilitate the subsequent accurate clamping of the positioning body on the machine tool, a positioning hole A13 is coaxially opened on the end face of the extension section of the positioning body, and a positioning hole B15 is coaxially opened on the end face of the threaded section.
[0027] In addition, it should also be noted that in order to ensure the coaxial connection between the first cone and the internal spline and convert the reference axis of the internal spline outwards, a expansion sleeve 2 is also sleeved on the first cone, and a threaded nut 3 is screwed on the threaded section 13. The end face of the threaded nut abuts against the end face of the expansion sleeve, so that when the threaded nut rotates and axially moves towards the first cone direction, it can stably push the expansion sleeve 2 to move and expand on the first cone.
[0028] It should be noted that in order to ensure that the expansion sleeve is in surface contact rather than line contact with the internal spline after expansion, so as to improve the positioning stability between the expansion sleeve 2 and the internal spline after tightening. The gap between the outer edge of the expansion sleeve and the inner diameter surface of the internal spline is 0.1mm. It should be noted that the gap in this solution is a unilateral gap.
[0029] In addition, it should also be noted that in order to further improve the stability during the tightening process of the expansion sleeve, the taper of the first cone is optimally 10-12°.
[0030] In addition, it should also be noted that when performing external circle machining on the input shaft, if one end of the input shaft is suspended, when performing external circle grinding, the input shaft is likely to be deflected due to uneven force and the loss of stable support at the other end, which will cause the size of the input shaft after machining to lose accuracy. Therefore, on the basis of the above solution, a second cone 16 is also provided on the left part of the extension section. The second cone also maintains a coaxial relationship with the first cone, so as to be able to maintain a coaxial relationship with the internal spline together with the first cone. However, it should be noted that in this solution, the outer diameter dimension of the second cone needs to be larger than the diameter of the inner hole of the input shaft, so that while the internal spline of the input shaft is tightened by the expansion sleeve, the shaft end of the input shaft can coaxially abut against the second cone, providing another strong support for the input shaft during external circle grinding.
[0031] Preferably, in order to enable the positioning body to adapt to the processing requirements of input shafts of more specifications. The second cone 16 in the above solution adopts a multi-stage structure. Specifically, the second cone has at least two stages of cone structures, and the outer diameter of each stage of the cone structure gradually increases from the side close to the first cone to the side far from the first cone.
[0032] Working principle: When machining the outer circle of the input shaft, the staff first inserts the threaded end, the first cone and the extension section of the positioning body into the shaft hole of the input shaft, and makes the first cone in the internal spline position of the input shaft. Then, sleeved the expansion sleeve on the first cone platform and screwed the threaded cap on the threaded section. After the above actions are completed, erect the positioning body so that the threaded section is on the top and the extension section is on the bottom. At this time, due to the action of gravity, the central hole A of the input shaft abuts against the conical surface of the second cone. And the expansion sleeve naturally falls on the first cone platform. Subsequently, rotate the threaded cap so that the threaded cap presses against the expansion sleeve. As the threaded cap continues to rotate, the expansion sleeve is axially moved and pressed tightly on the first cone by the threaded cap, and at the same time, the expansion sleeve expands and tightens in the internal spline. At this time, the expansion sleeve and the internal spline maintain a coaxial relationship. It should be noted that due to the cooperation principle between the expansion sleeve and the first cone, the expansion sleeve, the first cone and the internal spline share the axis. At this time, the reference axis of the internal spline is transferred to the first cone, and then transferred to the positioning holes A and B at both ends through the first cone. When machining the outer circle of the input shaft, only need to ensure that the machine tool turntable is coaxial with the positioning holes A and B, then the coaxiality between the outer circle and the internal spline can be ensured. Thus, for the machined part, its runout value is less than the machining requirement of 0.03mm max.
[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An inner support positioning device for grinding the outer circle of the internal spline of an input shaft, characterized in that: including a positioning body (1), the positioning body (1) includes a first cone (11) coaxial with the internal spline, the maximum outer diameter of the first cone (11) is smaller than the inner diameter of the internal spline, the left side of the first cone (11) is coaxially connected with an extension section (12), a positioning hole A (13) is coaxially opened on the left end face of the extension section (12), the right side of the first cone (11) is coaxially connected with a threaded section (14), and a positioning hole B (15) is coaxially arranged on the end face of the threaded section (14); a expansion sleeve (2), coaxially sleeved on the first cone (11); a threaded compression cap (3), screwed on the threaded section (14), and applying a uniform axial thrust to the expansion sleeve (2) during rotation.
2. The inner support input shaft internal spline grinding outer circle positioning device according to claim 1, wherein: The clearance between the outer edge of the expansion sleeve (2) and the inner diameter of the internal spline is 0.1 mm.
3. The inner support input shaft internal spline grinding outer circle positioning device according to claim 2, characterized in that: The taper of the first cone (11) is 10-12°.
4. The inner support input shaft internal spline grinding outer circle positioning device according to claim 3, characterized in that: The extension section (12) has a second cone (16) connected to the extension section (12), the second cone (16) is coaxial with the first cone (11), and the outer diameter of the second cone (16) is larger than the inner hole diameter of the input shaft.
5. The inner support input shaft internal spline grinding outer circle positioning device according to claim 4, characterized in that: The second cone (16) has at least two stages, and the outer diameter gradually increases from the side close to the first cone (11) to the side far from the cone.