Detachable axial and radial accurate positioning structure

Abstract

The utility model relates to the technical field of shaft hole matching, and provides a detachable axial and radial accurate positioning structure which comprises a hole component, a shaft component and a positioning ring, the hole component is provided with an assembly hole and a first positioning end face, the shaft component is provided with an assembly shaft and a second positioning end face, and after assembly, the first positioning end face abuts against the second end face. A first conical surface is arranged at one end, and a second conical surface is arranged at the other end; the first positioning end face is provided with a first taper hole matched with the first conical surface, and the second positioning end face is provided with a second taper hole matched with the second conical surface. By means of the automatic centering principle of conical surface matching, radial accurate positioning of the hole component and the shaft component is achieved, the matching accuracy of the shaft and the shaft is guaranteed, and the device is suitable for occasions with high coaxiality requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft-hole matching, in particular to a detachable axial and radial precise positioning structure. Background Art

[0002] In traditional shaft-hole assembly, axial positioning is easy to achieve, while radial positioning usually adopts clearance fit to achieve the requirement of repeatable disassembly and assembly. In order to improve the fitting accuracy, it is necessary to minimize the fitting clearance. However, too small a fitting clearance will greatly increase the difficulty of processing and assembly. No matter how to reduce the fitting clearance, theoretically, due to the existence of the clearance, there will be coaxiality error between the hole and the shaft after fitting. Therefore, for some mechanisms that require extremely high coaxiality after assembly, their performance will be restricted. Utility Model Content

[0003] The utility model aims to provide a detachable axial and radial precise positioning structure, so as to solve the defects of existing shaft-hole clearance matching and realize precise positioning of shaft-hole matching.

[0004] The embodiments of the present invention are implemented by the following technical solutions:

[0005] A detachable axial and radial precise positioning structure comprises a hole component and a shaft component, wherein the hole component is provided with an assembly hole and a first positioning end face, and the shaft component is provided with an assembly shaft and a second positioning end face, and after assembly, the first positioning end face and the second end face abut against each other, and further comprises a positioning ring, one end of which is provided with a first conical surface and the other end of which is provided with a second conical surface; the first positioning end face is provided with a first conical hole matching with the first conical surface, and the second positioning end face is provided with a second conical hole matching with the second conical surface.

[0006] Optionally, the positioning ring is provided with a notch for disconnecting itself.

[0007] Optionally, the first conical surface and the first conical hole, and the second conical surface and the second conical hole, have a conical angle greater than the self-locking angle.

[0008] Optionally, the first conical surface, the second conical surface, the first conical hole and the second conical hole have the same conical angles.

[0009] The technical solution of the present utility model has at least the following advantages and beneficial effects: in the present utility model, the first conical surface of the positioning ring cooperates with the first conical hole of the hole component, and at the same time, the second conical surface of the positioning ring cooperates with the second conical hole of the shaft component, and the automatic centering principle of the conical surface cooperation is utilized to realize the radial precise positioning of the hole component and the shaft component, thereby ensuring the shaft-hole cooperation accuracy, and is suitable for occasions with high coaxiality requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 A schematic cross-sectional exploded view of a detachable axial and radial precise positioning structure provided by the utility model;

[0012] Figure 2 A cross-sectional view of a detachable axial and radial precise positioning structure provided by the utility model;

[0013] Figure 3 It is a structural schematic diagram of the positioning ring;

[0014] Icon: 1-hole component, 11-first tapered hole, 12-assembly hole, 13-first positioning end face, 2-positioning ring, 21-first tapered surface, 22-second tapered surface, 23-notch, 3-axis component, 31-second tapered hole, 32-assembly axis, 33-second positioning end face. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0018] refer to Figure 1-2A detachable axial and radial precise positioning structure comprises a hole component 1, a shaft component 3 and a positioning ring 2, wherein the hole component 1 is provided with an assembly hole 12 and a first positioning end face 13, the shaft component 3 is provided with an assembly shaft 32 and a second positioning end face 33, one end of the positioning ring 2 is provided with a first conical surface 21, the other end of the positioning ring 2 is provided with a second conical surface 22, the first positioning end face 13 is provided with a first conical hole 11 matched with the first conical surface 21, and the second positioning end face 33 is provided with a second conical hole 31 matched with the second conical surface 22. After assembly, the first positioning end face 13 and the second end face are abutted against each other to achieve axial positioning, and the automatic centering principle of the conical surface matching is used to achieve radial precise positioning of the hole component 1 and the shaft component 3, thereby ensuring the shaft-hole matching accuracy, and the shaft component 3 can be repeatedly disassembled and assembled, and can be widely used in occasions with high coaxiality requirements and repeated disassembly and assembly.

[0019] Based on the above, refer to Figure 3 The positioning ring 2 is provided with a notch 23 that disconnects itself, so that the positioning ring 2 can shrink within a certain range and undergo elastic deformation. During the assembly process, after the first tapered hole 11 of the hole component 1 contacts the first tapered surface 21 of the positioning ring 2, and after the second tapered hole 31 of the shaft component 3 contacts the second tapered surface 22 of the positioning ring 2, there is still a certain distance between the first positioning end surface 13 of the hole component 1 and the second positioning end surface 33 of the shaft component 3. As the assembly process continues, the positioning ring 2 begins to elastically deform under the extrusion of the first tapered hole 11 and the second tapered hole 31, that is, the outer diameter is reduced by a certain amount, which better fits the space formed by the first tapered hole 11 and the second tapered hole 31, and also makes the positioning structure not affected by the radial dimensions of the assembly hole 12 and the assembly shaft 32 within a certain range, and has low requirements on the processing dimensional accuracy of the hole component 1 and the shaft component 3.

[0020] The cone angles of the first cone surface 21 and the first cone hole 11 are larger than the self-locking angle of the two. Meanwhile, the cone angles of the second cone surface 22 and the second cone hole 31 are also larger than the self-locking angle of the two. This arrangement avoids self-locking and thus preventing disassembly difficulties.

[0021] The first tapered surface 21, the second tapered surface 22, the first tapered hole 11 and the second tapered hole 31 have the same tapered angles. This arrangement facilitates processing, and the positioning ring 2 can be installed in both the forward and reverse directions, making installation convenient.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A detachable axial and radial precise positioning structure, comprising a hole component (1) and a shaft component (3), wherein the hole component (1) is provided with an assembly hole (12) and a first positioning end face (13), and the shaft component (3) is provided with an assembly shaft (32) and a second positioning end face (33), and after assembly, the first positioning end face (13) and the second end face abut against each other, characterized in that: It also includes a positioning ring (2), one end of which is provided with a first conical surface (21) and the other end of which is provided with a second conical surface (22); the first positioning end surface (13) is provided with a first conical hole (11) that matches the first conical surface (21), and the second positioning end surface (33) is provided with a second conical hole (31) that matches the second conical surface (22).

2. A detachable axial and radial precise positioning structure according to claim 1, characterized in that: The positioning ring (2) is provided with a notch (23) for disconnecting itself.

3. A detachable axial and radial precise positioning structure according to claim 1 or 2, characterized in that: The first conical surface (21) and the first conical hole (11), as well as the second conical surface (22) and the second conical hole (31), have a conical angle greater than a self-locking angle.

4. A detachable axial and radial precise positioning structure according to claim 1 or 2, characterized in that: The first conical surface (21), the second conical surface (22), the first conical hole (11) and the second conical hole (31) have the same conical angles.

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