Shaft hole concentric positioning structure

Abstract

The utility model relates to a shaft hole matching structure. A shaft hole concentric positioning structure comprises a shaft piece and a hole piece which are matched with each other, a plurality of hole protrusions are arranged on the inner wall of the matched hole piece, shaft protrusions are arranged on the outer wall of the shaft piece, the shaft protrusions comprise transition shaft protrusions and gap shaft protrusions, the transition shaft protrusions are in transition fit with the hole protrusions, and the gap shaft protrusions are arranged on the outer wall of the shaft piece. The gap shaft protrusion is in clearance fit with the hole wall of the hole piece. The utility model provides a shaft hole concentric positioning structure which is simple in structure, convenient to install, capable of being suitable for hole-shaft matching structures made of any materials and good in positioning effect. The technical problems that in the prior art, shaft holes of non-metal components are difficult to match, installation is inconvenient, and the positioning effect is poor are solved.

Description

Technical Field

[0001] The utility model relates to a shaft-hole matching structure, in particular to a shaft-hole concentric positioning matching structure. Background Art

[0002] In mechanical structures, the matching structure of shaft and hole is widely used. In the current traditional scheme, the matching form of shaft and hole is mostly in the form of shaft-hole matching system, which requires extremely high precision requirements for both holes and shafts during processing, and it is extremely easy to have problems such as installation difficulties and inability to disassemble during assembly due to the matching of surfaces. For metal samples, the shaft-hole matching system can be relatively easy to meet.

[0003] For materials that are easy to deform or have roundness problems, there has always been a situation where the assembly design dimensions and the assembly effect after manufacturing are mutually constrained. If the shaft and the hole are designed in an interference fit manner to achieve the high-precision performance requirements of the product, then it is necessary to consider the size of the product's interference and the difficulty of installation caused by product deformation. On the one hand, the optimal state of the product's interference has very high requirements for the accuracy of the product mold, especially the matching structure of the shaft and the circular surface of the hole. There are extremely high requirements for the roundness of the product and the concentricity of the product after assembly. Once the interference of the product is too large, it will cause the product to be difficult to install or even unable to be used normally. In the actual production process, the interference fit design structure has very high requirements for the consistency of production, and it is very easy to produce more defective products in the process. If the shaft and the hole are designed in a clearance fit manner to achieve rapid installation of the product, then there will inevitably be a large dispersion in the performance accuracy of the product, which cannot meet the client's accuracy requirements. Summary of the invention

[0004] The utility model provides an axis-hole concentric positioning structure with simple structure, convenient installation, applicable to hole-axis matching structures of any material and good positioning effect; it solves the technical problems existing in the prior art of difficult axis-hole matching for non-metallic components, inconvenient installation and poor positioning effect.

[0005] The above technical problem of the utility model is solved by the following technical scheme: a shaft-hole concentric positioning structure, comprising a shaft member and a hole member that cooperate with each other, a plurality of hole protrusions are arranged on the inner wall of the cooperative hole member, and a shaft protrusion is arranged on the outer wall of the shaft member, the shaft protrusion comprises a transition shaft protrusion and a clearance shaft protrusion, the transition shaft protrusion is transitionally matched with the hole protrusion, and the clearance shaft protrusion is gap-matched with the hole wall of the hole member. The hole protrusion is not completely matched with the shaft protrusion, but a part of it is transitionally matched with the transition shaft protrusion, so as to position the cooperation of the shaft-hole member. In order to facilitate assembly, the remaining clearance shaft protrusion is only gap-matched with the hole wall, which can meet the production and installation requirements of the product, and can meet the size and application requirements of the product. Compared with the traditional scheme, the product structure of the utility model can be better applied to the shaft-hole cooperation between various materials (such as the product roundness is poor during the injection molding process). The operability and qualified rate of the product are greatly improved. The roundness of the product is not so high, but it can meet the concentricity requirements.

[0006] Preferably, evenly distributed grooves are formed on the hole wall, axial columns are formed in the grooves, and the protrusions are convex surfaces of the columns facing the inside of the hole.

[0007] Preferably, the projections forming transition fit in the hole projections account for half of the total number of hole projections, so as to achieve partial gap and partial transition, thereby avoiding mutual interference and ensuring the concentric positioning effect.

[0008] Preferably, there are 8 hole protrusions and 12 shaft protrusions, of which there are 4 transition shaft protrusions, and the 4 transition protrusions are evenly distributed on the outer wall of the shaft. The four-point matching and four-point clearance form can not only constrain each other during assembly, but also be independent of each other during use. The product adopts the form of eight cylinders in the hole part and 12 arcs in the shaft part. When the shaft part is installed at any angle, the product shaft part and the hole part can be over-positioned in four directions, and the four-direction clearance fit will not cause installation difficulties or insufficient positioning. The four directions can just position the shaft hole in four directions, and effectively prevent mutual interference.

[0009] Preferably, the outer wall of the shaft is evenly distributed with grooves, and shaft protrusions are formed between adjacent grooves, and the arc length of the shaft protrusions is greater than the arc length of the grooves. The transition shaft protrusions and hole protrusions that achieve transition fit are point-to-surface fit, and the clearance shaft protrusions and hole walls that achieve clearance fit are surface-to-surface fit. On the premise that the point-to-surface fit achieves concentric positioning, the surface-to-surface fit is easy to process and install, and has a good fit effect.

[0010] Preferably, the hole member is a plastic member or a metal member, and the shaft member is a plastic member or a metal member.

[0011] Therefore, the shaft hole concentric positioning structure of the utility model has the following advantages:

[0012] (1) This design can achieve good matching effects on the matching of metal and metal, metal and plastic, and even other materials. It can ensure the concentricity of the product and the stability of installation, and have better real-time feasibility.

[0013] (2) It reduces the size requirements that need to be controlled, reduces the precision requirements for production, improves the efficiency of size detection during the production process, and reduces the scrap rate of products during the production process.

[0014] (3) The four-point matching and four-point clearance form can restrain each other during assembly and be independent of each other during use. When the shaft is installed at any angle, the product shaft and hole can be over-positioned in four directions, and the four-direction clearance matching makes the installation structure simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a stereoscopic diagram of an axis-hole concentric positioning structure.

[0016] Figure 2 yes Figure 1 Top view of the .

[0017] Figure 3 yes Figure 1 A three-dimensional view of the inner hole part.

[0018] Figure 4 yes Figure 1 A perspective view of the inner shaft. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0020] Example:

[0021] like Figure 1 and 2 As shown, a shaft-hole concentric positioning structure includes a shaft component 2 and a hole component 1 that need to cooperate with each other.

[0022] like Figure 3As shown, the hole member 1 is evenly provided with a slot 6, and a column 5 is formed in the slot 6, and the outer wall of the column 5 protrudes toward the hole to form a convex surface. The hole member 1 is formed with 8 columns 5, forming 8 hole protrusions, of which 4 hole protrusions are transitionally matched with the transition shaft protrusion 3 on the shaft member 2, forming 4 hole protrusions with transitional fit, which are arranged at intervals, that is, one hole protrusion is matched with the transition shaft protrusion 3, and the adjacent hole protrusions correspond to the groove on the shaft member or the outer wall of the shaft member, and do not form a transitional fit.

[0023] like Figure 4 As shown, shaft protrusions are evenly distributed on the shaft member 2. The shaft protrusions are formed by evenly distributed grooves 8 on the outer wall of the shaft member, and the portion between adjacent grooves 8 is the shaft protrusion. The arc length of the shaft protrusion is greater than the arc length of the groove 8, which facilitates the shaft protrusion to cooperate with the hole member. There are 12 shaft protrusions in total, of which 4 are transition shaft protrusions 3 and the other 8 are clearance shaft protrusions 4. There are two clearance shaft protrusions 4 between two adjacent transition shaft protrusions 3. The clearance shaft protrusion 4 is clearance-matched with the inner wall 7 of the hole member.

[0024] The transitional fit between the four hole protrusions and the transition shaft protrusions realizes positioning in four directions and ensures concentricity. The fit between the clearance shaft protrusion and the hole wall ensures the convenience of installation and good fit effect.

[0025] The specific embodiments described herein are merely examples of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A shaft hole concentric positioning structure, characterized in that: It comprises a shaft component and a hole component which cooperate with each other, a plurality of hole protrusions are arranged on the inner wall of the cooperative hole component, a shaft protrusion is arranged on the outer wall of the shaft component, the shaft protrusion comprises a transition shaft protrusion and a clearance shaft protrusion, the transition shaft protrusion is transitionally matched with the hole protrusion, and the clearance shaft protrusion is clearance matched with the hole wall of the hole component.

2. The axial hole concentric positioning structure according to claim 1, characterized in that: The hole wall is provided with evenly distributed slots, an axial column is formed in the slot, and the protrusion is a convex surface of the column facing the inside of the hole.

3. The axial hole concentric positioning structure according to claim 1 or 2, characterized in that: The projections forming transition fit among the hole projections account for half of the total number of the hole projections.

4. The axial hole concentric positioning structure according to claim 1 or 2, characterized in that: There are 8 hole protrusions and 12 shaft protrusions, of which there are 4 transition shaft protrusions, and the 4 transition protrusions are evenly distributed on the outer wall of the shaft.

5. The axial hole concentric positioning structure according to claim 1 or 2, characterized in that: The outer wall of the shaft is evenly distributed with grooves, and shaft protrusions are formed between adjacent grooves, and the arc length of the shaft protrusions is greater than the arc length of the grooves.

6. The axial hole concentric positioning structure according to claim 1 or 2, characterized in that: The hole piece is a plastic piece or a metal piece, and the shaft piece is a plastic piece or a metal piece.

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