Ball head contour positioning step sleeve structure
The step sleeve structure is positioned through the contour of the ball head, and the arc-shaped coordination of the projection and the slot is used to solve the problem of flexibility and accuracy in the connection between the thin-wall kit and the shaft body, achieving a low-cost and high-precision synchronous rotation effect.
Patent Information
- Application Number
- CN202521079178.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-29
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2035-05-29
AI Technical Summary
In the prior art, it is difficult to achieve a balance between flexibility and dynamic accuracy in the connection structure between thin-walled sleeves and the shaft body. Especially under the size limitation, traditional flat bond fitting and adhesive methods lead to inflexible assembly and poor dynamic accuracy.
The ball head contour positioning step sleeve structure is adopted, and the projection of the shaft member is matched with the slot of the kit, and the arc-shaped contour line is used to achieve synchronous rotation, combining the shaft shoulder and positioning surface to provide positioning, reducing processing difficulty and cost, and adapting to the needs of thin-walled kits.
The synchronous rotation of the kit and the shaft is realized, reducing machining difficulty and cost, improving dynamic accuracy, and adapting to the assembly requirements of thin-wall kits.
Smart Images
Figure CN223089828U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor drive connection structures, and particularly relates to a ball-head profile positioning step sleeve structure. Background Art
[0002] In mechanical structures, the connection between a rotating shaft part and a corresponding sleeve part is generally achieved through a flat key fitting structure. However, for some thin-walled sleeve parts with relatively small wall thickness dimensions, the connection structure between them and the shaft body, such as between a motor rotor sleeve with a magnet attached and a motor shaft, it is difficult to adopt a flat key fitting due to size limitations. And the assembly relationship formed by using a too tight fit or gluing and curing methods has very poor flexibility and has a greater impact on dynamic accuracy. Content of the Utility Model
[0003] The purpose of the utility model is to provide a ball-head profile positioning step sleeve structure to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or creation condition.
[0004] The technical solution adopted to solve the above technical problems:
[0005] A ball-head profile positioning step sleeve structure includes: a shaft part and a sleeve part. The sleeve part is coaxially sleeved on the shaft part. The shaft part is provided with a convex protruding part, and the protruding part is in a semi-spherical shape. The sleeve part is provided with a clamping groove corresponding to the protruding part, and the protruding part is embedded in the clamping groove. On the projection plane perpendicular to the axial direction, the contour lines of the clamping groove and the protruding part are both in an arc shape and coincide with each other.
[0006] The ball-head profile positioning step sleeve structure provided by the utility model has at least the following beneficial effects: The connection and transmission between the sleeve part and the shaft part are realized through the cooperation structure of the clamping groove and the protruding part. The clamping groove and the protruding part are in contact with each other through the arc-shaped contour line, so as to limit the relative rotation of the sleeve part and the shaft part, so that the sleeve part and the shaft part can rotate synchronously. In the ball-head profile positioning step sleeve structure of the utility model, the processing difficulty and processing cost of the arc contour of the clamping groove are relatively low, and the requirement for the thickness of the sleeve part is low and it can adapt to thin-walled sleeve parts. The assembly is simple and the dynamic accuracy is high.
[0007] As a further improvement of the above technical solution, the shaft part is provided with a shaft shoulder, the shaft shoulder has a limiting surface, the end of the sleeve part is provided with a positioning surface, and the positioning surface and the limiting surface are both perpendicular to the axial direction and are in contact with each other.
[0008] As a further improvement of the above technical solution, the protruding part is arranged at the rear side of the limiting surface, the clamping groove extends axially forward and backward, the clamping groove has an opening facing the limiting surface, and the opening is arranged on the positioning surface.
[0009] As a further improvement of the above technical solution, the depth of the card slot is not less than the axial distance between the end of the convex portion away from the limiting surface and the limiting surface.
[0010] As a further improvement of the above technical solution, the kit is provided with a boss, the positioning surface is arranged at one end of the boss, and the axial thickness of the boss is greater than the depth of the card slot.
[0011] As a further improvement of the above technical solution, the shaft member includes a shaft body and a ball head pin. The ball head pin includes a connecting end and the convex portion. The convex portion is arranged at one end of the ball head pin, and the connecting end is arranged at the other end of the ball head pin and inserted into the shaft body.
[0012] As a further improvement of the above technical solution, the shaft body is provided with a pin hole extending radially, and the connecting end is in a cylindrical shape and coaxially inserted into the pin hole.
[0013] As a further improvement of the above technical solution, the height of the connecting end is greater than the depth of the pin hole, so that the convex portion protrudes out of the shaft body.
[0014] As a further improvement of the above technical solution, the number of the convex portion and the card slot is one. The kit is further provided with a balance groove, and the balance groove and the card slot are arranged on the radial two sides of the kit respectively.
[0015] As a further improvement of the above technical solution, the number of the convex portion and the card slot is multiple. The multiple convex portions are evenly distributed around the circumference of the shaft member, and the card slots are arranged in one-to-one correspondence with the convex portions. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The following further describes the present utility model in conjunction with the drawings and embodiments;
[0017] Figure 1 FIG. is a three-dimensional schematic diagram of an embodiment of the ball head profile positioning step sleeve structure provided by the present utility model;
[0018] Figure 2 FIG. is a three-dimensional exploded schematic diagram of an embodiment of the ball head profile positioning step sleeve structure provided by the present utility model;
[0019] Figure 3 FIG. is a lateral sectional view of an embodiment of the ball head profile positioning step sleeve structure provided by the present utility model;
[0020] Figure 4 FIG. is a front sectional view of an embodiment of the ball head profile positioning step sleeve structure provided by the present utility model.
[0021] In the figure: 100 - shaft component, 110 - shaft body, 111 - pin hole, 120 - ball head pin, 121 - convex part, 122 - connection end, 130 - shaft shoulder, 131 - limiting surface, 200 - kit, 210 - clamping groove, 220 - positioning surface, 230 - through hole, 240 - boss, 250 - balance groove. Detailed implementation manners
[0022] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.
[0023] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation on the present invention.
[0024] In the description of the present invention, if there are words such as "several" for description, its meaning is one or more, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number.
[0025] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.
[0026] Referring to Figures 1 to 4 , the following embodiments are made for the ball head profile positioning step sleeve structure of the present invention:
[0027] As Figure 1 shown, a ball head profile positioning step sleeve structure includes: a shaft component 100 and a kit 200.
[0028] The shaft member 100 has a cylindrical shape, and the sleeve member 200 has a cylindrical sleeve shape. The sleeve member 200 is coaxially sleeved outside the shaft member 100. The shaft member 100 is provided with a convex protrusion 121, and the protrusion 121 is provided on the outside of the shaft member 100 in a semi-spherical shape. The sleeve member 200 is provided with a card slot 210 corresponding to the protrusion 121, and the protrusion 121 is embedded in the card slot 210. On the projection plane perpendicular to the axial direction, the contour lines of the card slot 210 and the protrusion 121 are both arc-shaped and coincide with each other.
[0029] During actual use, the connection and transmission between the sleeve member 200 and the shaft member 100 are realized through the matching structure of the card slot 210 and the protrusion 121. The card slot 210 and the protrusion 121 are in contact with each other through the arc-shaped contour line, so that the relative rotation of the sleeve member 200 and the shaft member 100 is restricted by the card slot 210 and the protrusion 121, so that the sleeve member 200 and the shaft member 100 can rotate synchronously.
[0030] The card slot 210 is arranged inside the sleeve member 200, so the card slot 210 cannot be processed by a tool arranged along the radial direction. Traditional flat key grooves require multiple tools. First, the general shape of the flat key groove is processed, and then the corners of the flat key groove are processed. And a relatively large thickness needs to be reserved for the sleeve parts to process the corners of the flat key groove; for convenient assembly, the flat key groove and the flat key generally adopt a clearance fit. Otherwise, the surface contact between the flat key and the flat key groove makes the axial assembly resistance very large. Therefore, the dynamic accuracy of the flat key structure during reciprocating rotation is low, and it is more suitable for unidirectional rotation transmission occasions. In the ball head contour positioning step sleeve structure of the present invention, the arc contour of the card slot 210 can be directly processed and formed by a tool with the same diameter, and the processing difficulty and processing cost are relatively low. And because the card slot 210 with an arc contour does not need to process the corners, the thickness requirement for the sleeve member 200 is low and it can adapt to the thin-walled sleeve member 200. The card slot 210 and the protrusion 121 are in contact with each other through the arc-shaped contour line. Even if an interference fit or an interference fit is adopted, the resistance or difficulty during assembly is not very high, avoiding the existence of a gap between the card slot 210 and the protrusion 121, and improving the dynamic accuracy.
[0031] To provide an axial positioning reference for the sleeve member 200, the shaft member 100 is provided with a shaft shoulder 130, and the shaft shoulder 130 has a limiting surface 131. The sleeve member 200 is provided with a positioning surface 220. The positioning surface 220 and the limiting surface 131 are both perpendicular to the axial directions of the shaft member 100 and the sleeve member 200, and the positioning surface 220 abuts against the limiting surface 131. Referring to the attached drawings, taking the axial directions of the shaft member 100 and the sleeve member 200 as the front and rear directions, the shaft shoulder 130 and the sleeve member 200 are arranged front and rear. The limiting surface 131 is arranged at the rear end of the shaft shoulder 130, and the positioning surface 220 is arranged at the front end of the sleeve member 200.
[0032] The limiting surface 131 and the protruding portion 121 are arranged front and back, the protruding portion 121 is arranged at the rear side of the limiting surface 131, the card slot 210 extends in the front-back direction, the card slot 210 has an opening facing forward, and the opening is arranged on the positioning surface 220 to face the limiting surface 131. During the assembly process, the kit 200 is sleeved on the shaft member 100 from back to front, and the protruding portion 121 is embedded into the card slot 210 through the opening until the positioning surface 220 abuts against the limiting surface 131.
[0033] The depth of the card slot 210 is set according to the axial distance between the end of the protruding portion 121 away from the limiting surface 131 and the limiting surface 131. Specifically, the depth of the card slot 210 is not less than the axial distance between the end of the protruding portion 121 away from the limiting surface 131 and the limiting surface 131, so that the protruding portion 121 can be embedded into the card slot 210, thereby enabling the positioning surface 220 to abut against the limiting surface 131.
[0034] In this embodiment, the protruding portion 121 of the shaft member 100 adopts a split structure, and the shaft member 100 includes a shaft body 110 and a ball head pin 120. The ball head pin 120 includes a connecting end 122 and the protruding portion 121, the protruding portion 121 is arranged at one end of the ball head pin 120, and the connecting end 122 is arranged at the other end of the ball head pin 120 and is inserted into the shaft body 110.
[0035] The shaft body 110 is in a cylindrical shape, and a pin hole 111 extending in the radial direction is arranged on the outer side wall of the shaft body 110. Both the connecting end 122 and the pin hole 111 are in a cylindrical shape, and the connecting end 122 is coaxially inserted into the pin hole 111. During actual use, the pin hole 111 is machined on the outer side of the shaft body 110, and the ball head pin 120 is positioned on the shaft body 110 by inserting the cylindrical connecting end 122 into the pin hole 111.
[0036] To ensure that the protruding portion 121 can be exposed outside the shaft body 110, the height dimension of the connecting end 122 in its axial direction is greater than the depth dimension of the pin hole 111 in the radial direction of the shaft body 110, so that after the connecting end 122 is completely inserted into the bottom of the pin hole 111, the protruding portion 121 still protrudes outside the shaft body 110.
[0037] The kit 200 is in the shape of a cylindrical sleeve. The kit 200 has a through hole 230 that penetrates axially. The diameter of the through hole 230 is set according to the diameter of the shaft member 100. The shaft body 110 is inserted into the through hole 230. The card slot 210 extends along the axial direction of the kit 200. The card slot 210 communicates with the through hole 230. The card slot 210 has a bottom and two side walls. The two side walls are two planes that extend in the front and rear directions and are arranged opposite to each other left and right. The projection of the bottom in the front and rear directions is in the shape of a semi-circular arc. The semi-spherical convex portion 121 of the ball head pin 120 abuts against the bottom, so that its arc contour coincides with the bottom contour of the card slot 210.
[0038] The card slot 210 can be machined by a milling cutter that extends axially. The radius of the milling cutter is the same as the radius of the convex portion 121 and the arc path of the card slot 210. The milling cutter extends into the through hole 230 of the kit 200 and then feeds radially to machine the card slot 210 on the inner side wall of the kit 200. The processing difficulty and cost are low.
[0039] A boss 240 is provided at the front end of the kit 200. The outer diameter of the boss 240 is larger than the outer diameter of other positions of the kit 200. The thickness dimension of the boss 240 in the axial direction is larger than the depth dimension of the card slot 210. The boss 240 with a larger wall thickness can provide space for the card slot 210. Other positions of the kit 200 can adopt a smaller outer diameter to form a thin-walled structure, making the overall structure more compact. To reduce the size of the card slot 210 in the front and rear directions, the distance between the convex portion 121 and the limiting surface 131 should not be too large.
[0040] In some embodiments, as Figure 3 shown, the number of the convex portion 121 and the card slot 210 is one each. The kit 200 is also provided with a balance groove 250. The balance groove 250 and the card slot 210 are respectively arranged on the radial two sides of the kit 200. The semi-spherical convex portion 121 will not completely fill the card slot 210. After the convex portion 121 is embedded in the card slot 210, there is still a certain gap in the card slot 210. Through the balance groove 250, the weight of the kit 200 with only a single card slot 210 can be made uniform, avoiding eccentric beating or tendency during the rotation of the kit 200 on one side, and the accuracy is higher.
[0041] In some other embodiments, as Figure 4 shown, the number of the convex portion 121 and the card slot 210 is two each. The two convex portions 121 are respectively arranged on the radial two sides of the shaft member 100. The card slot 210 is arranged on the radial two sides of the kit 200.
[0042] In some other embodiments, the number of the protruding portions 121 and the card slots 210 may also be more than three. The protruding portions 121 are evenly distributed around the circumference of the shaft member 100, and the card slots 210 are arranged in one-to-one correspondence with the protruding portions 121.
[0043] In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0044] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can still make various changes, modifications, substitutions, and variations to these embodiments without departing from the principles and spirit of the present invention. These changes, modifications, equivalent variations, or substitutions are all included within the scope defined by the claims of this application. The scope of the present invention is defined by the claims and their equivalents.
Claims
1. A ball head profile positioning step sleeve structure, characterized in that: Comprising: A shaft member and a kit, the kit being coaxially sleeved on the shaft member. The shaft member is provided with an outwardly convex protrusion, the protrusion being in the shape of a semi-sphere. The kit is provided with a card slot corresponding to the protrusion, and the protrusion is embedded in the card slot. On a projection plane perpendicular to the axial direction, the contour lines of the card slot and the protrusion are both arc-shaped and coincide with each other.
2. The ball head profile positioning step sleeve structure according to claim 1, characterized in that: The shaft member is provided with a shaft shoulder having a limiting surface, and the end of the kit is provided with a positioning surface. The positioning surface and the limiting surface are both perpendicular to the axial direction and are in contact with each other.
3. The ball head profile positioning step sleeve structure according to claim 2, wherein: The protrusion is provided at the rear side of the limiting surface. The card slot extends axially forward and backward, and the card slot has an opening facing the limiting surface, and the opening is provided on the positioning surface.
4. The ball head profile positioning step sleeve structure according to claim 3, characterized in that: The depth of the card slot is not less than the axial distance between the end of the protrusion away from the limiting surface and the limiting surface.
5. The ball head profile positioning step sleeve structure according to claim 4, wherein: The kit is provided with a boss, the positioning surface is provided at one end of the boss, and the axial thickness of the boss is greater than the depth of the card slot.
6. The ball head profile positioning step sleeve structure according to claim 1, characterized in that: The shaft member includes a shaft body and a ball head pin. The ball head pin includes a connecting end and the protrusion. The protrusion is provided at one end of the ball head pin, and the connecting end is provided at the other end of the ball head pin and is inserted into the shaft body.
7. The ball head profile positioning step sleeve structure according to claim 6, characterized in that: The shaft body is provided with a pin hole extending radially, and the connecting end is in the shape of a cylinder and is coaxially inserted into the pin hole.
8. The ball head profile positioning step sleeve structure according to claim 7, characterized in that: The height of the connecting end is greater than the depth of the pin hole, so that the protrusion protrudes outward from the shaft body.
9. The ball head profile positioning step sleeve structure according to claim 1, wherein: The number of the protrusion and the card slot is one each, and the kit is further provided with a balance groove, and the balance groove and the card slot are respectively arranged on the radial two sides of the kit.
10. The ball head profile positioning step sleeve structure according to claim 1, characterized in that: The number of the protrusion and the card slot is multiple, and the multiple protrusions are evenly distributed around the circumferential direction of the shaft member, and the card slots are arranged in one-to-one correspondence with the protrusions.