CN215861394U

CN215861394U - Sleeve part with inner hole provided with convex rectangular key

Info

Publication number: CN215861394U
Application number: CN202121922116.2U
Authority: CN
Inventors: 罗时友
Original assignee: Chongqing Changjiang Bearing Co Ltd
Current assignee: Chongqing Changjiang Bearing Co Ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2022-02-18
Anticipated expiration: 2031-08-17

Abstract

The utility model provides a sleeve part with an inner hole provided with a convex rectangular key, which comprises an annular sleeve body, wherein the sleeve body is provided with a central hole, the inner wall of the central hole is provided with the convex rectangular key extending along the length direction of the sleeve body, and the rectangular key and the sleeve body are integrally formed. The raised rectangular keys and the sleeve parts form a whole, so that the strength and the circumferential stress of the sleeve parts are improved, and the sleeve parts are particularly provided with gear or chain wheel structures on the outer circle and have thin wall thickness. The raised rectangular keys are directly matched with key grooves of the shaft parts, so that the number of parts is reduced, and the difference of assembled matching dimension chains is reduced; but also overcomes the fit clearance between the flat key and the concave key groove caused by manufacturing dispersion of the flat key and the concave key groove.

Description

Sleeve part with inner hole provided with convex rectangular key

Technical Field

The utility model belongs to the field of mechanical design, and particularly relates to a sleeve part with an inner hole provided with a convex rectangular key.

Background

When a general sleeve part needs to be fixed in the circumferential direction or transmit stress (i.e. the circumferential degree of freedom of the part needs to be limited), as shown in fig. 1 and 2, an inward-concave key groove (11) is usually arranged in a central inner hole of the sleeve part (10), so that the sleeve part is convenient to assemble with a shaft part (30). Specifically, an inner hole of the sleeve part (10) is matched with an excircle of the shaft part (30), the inner side face of the concave key groove (11) with the reverse width is matched with the outer side face of the flat key (20) in the width direction, and the outer side face of the flat key (20) in the width direction is also matched with the inner side face of the key groove of the shaft part (30) in the width direction.

However, the arrangement of the concave key groove (11) on the inner hole of the sleeve part (10) has the following technical problems: 1) the wall thickness of the sleeve part at the key groove can be reduced, the strength of the sleeve part is affected, and particularly for the sleeve part with a gear or chain wheel structure on the outer wall and with a thin wall thickness, such as shown in fig. 3, most of the rupture failure in the heat treatment strain cracks and the use process is generated at the concave key groove. 2) The manufacturing dispersion of the width of the flat key, the width and depth dimension dispersion of the concave key groove of the inner hole and the symmetry tolerance of the key groove and the inner hole jointly cause that the fit clearance between the flat key and the concave key groove of the inner hole is overlarge (the dispersion of a processing hole is 0.03+, the dispersion of the matching outer diameter of a key groove tool is 0.01+, the symmetry tolerance of a key groove tool groove is 0.015+, the matching outer diameter of a key groove tool groove is 0.015+ the verticality of a flange, the symmetry tolerance of the wide surface of a key groove broach key and the wide surface of a seat is 0.01), or when the fit clearance of the excircle of the shaft part and the inner hole of the sleeve part is reasonable, the symmetry tolerance of the key groove and the inner hole is large, the assembly performance of the shaft, the sleeve and the flat key is influenced, and therefore, a large impact action and a single-side stress of the flat key and the concave key groove of the inner hole and the shaft and the key groove can be caused at the moment of rotating and stopping of the sleeve part, and the process of deformation of the flat key and the shaft and the key groove of the hole is aggravated.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems in the prior art, and aims to provide a sleeve part with an inner hole provided with a convex rectangular key.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a cover class part that hole has protruding rectangle key, includes that cover class part includes annular cover body, is equipped with the centre bore on the cover body, has the bellied rectangle key that extends along the length direction of cover body on the inner wall of centre bore.

In the technical scheme, the raised rectangular keys and the sleeve parts form a whole, so that the strength and the circumferential stress of the sleeve parts are favorably improved, and the sleeve parts with the structures of gears or chain wheels on the excircle and thin wall thickness are particularly suitable for being used. The raised rectangular keys are directly matched with key grooves of the shaft parts, so that the number of parts is reduced, and the difference of assembled matching dimension chains is reduced; and the fit clearance between the flat key and the concave key groove caused by manufacturing dispersion difference of the flat key and the concave key groove is overcome, so that the impact deformation between the rectangular key on the inner wall of the sleeve part and the key groove of the shaft part can be reduced. In addition, the key groove of the shaft part is generally rectangular, and the key on the inner wall of the sleeve body is a matched rectangular key, so that the key groove on the shaft part does not need to be machined again.

In a preferred embodiment of the utility model, the rectangular key is integrally formed with the sleeve body. The strength of the integral forming is higher than that of the embedded structure.

In a preferred embodiment of the present invention, the rectangular key is formed by broaching. The geometry size and precision of the broaching machining product are higher, the consistency of the parts is good, the assembly is facilitated, and the assembly clearance is ensured

In a preferred embodiment of the utility model, the rectangular key and the sleeve body are separately arranged and then fixedly connected into a whole.

In a preferred embodiment of the present invention, the outer wall of the sleeve body is provided with a plurality of transmission teeth which are uniformly distributed in the circumferential direction.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a prior art kit of parts.

Fig. 2 is a schematic structural view of the assembly of the sleeve part and the shaft part in fig. 1.

FIG. 3 is a pictorial view of a crack occurring in the concave keyway of the sleeve component.

Fig. 4 is a schematic structural diagram of a kit part according to an embodiment of the present application.

Fig. 5 is a schematic sectional view a-a in fig. 1.

Reference numerals in the drawings of the specification include: the sleeve part 10, the key groove 11, the sleeve body 12, the central hole 13, the rectangular key 14, the chamfer 141, the transmission gear 15, the flat key 20 and the shaft part 30.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

The utility model provides a sleeve part with an inner hole provided with a convex rectangular key, as shown in fig. 4 and 2, in a preferred embodiment of the utility model, the sleeve part comprises an annular sleeve body, a central hole is arranged on the sleeve body, and the inner wall of the central hole is provided with a convex rectangular key extending along the length direction of the sleeve body. The length of the rectangular key may be shorter than the length of the sleeve body as shown in fig. 5, and of course, both ends of the rectangular key may also extend to the end surfaces of both ends of the sleeve body, and the present invention is not particularly limited.

According to the utility model, the concave key groove of the central hole of the sleeve part is changed into the convex rectangular key, and the convex rectangular key and the sleeve part form a whole, so that the strength and the circumferential stress of the sleeve part are improved; the raised rectangular keys are directly matched with key grooves of the shaft parts, so that the number of parts is reduced, and the difference of assembled matching dimension chains is reduced; but also overcomes the fit clearance between the flat key and the concave key groove caused by manufacturing dispersion of the flat key and the concave key groove.

In the present embodiment, the rectangular key is preferably integrally formed with the sleeve body, and for example, the rectangular key is formed by broaching. Broaching machining is machining of broaching tool forming, the geometric dimension and the precision of a machined product are high, the consistency of parts is good, assembly is facilitated, and an assembly gap is guaranteed. The method for machining the rectangular key by broaching is the same as that for machining the internal spline by broaching in the prior art, and is not detailed here for the prior art.

It should be noted that the rectangular key and the sleeve body can also be separately arranged and then fixedly connected into a whole.

In another preferred embodiment, the edge of the rectangular key remote from the inner wall of the central hole has a chamfer, such as a chamfer angle, with the chamfer dimension C0.3.

In another preferred embodiment, a plurality of transmission teeth are uniformly distributed on the outer wall of the sleeve body in the circumferential direction, and then the sleeve part is a gear sleeve.

In the description herein, reference to the description of the terms "preferred embodiment," "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a hole has set class part of protruding rectangle key which characterized in that, set class part includes annular cover body, be equipped with the centre bore on the cover body, the bellied rectangle key that the length direction of following cover body extends has on the inner wall of centre bore.

2. A sleeve-like member with a male rectangular key in its inner bore as defined in claim 1, wherein said rectangular key is formed integrally with the sleeve body.

3. A sleeve member with a male rectangular key in an inner bore according to claim 2, wherein the rectangular key is formed by broaching.

4. The sleeve part with the convex rectangular key in the inner hole as claimed in claim 1, wherein the rectangular key and the sleeve body are separately arranged and then fixedly connected into a whole.

5. A sleeve part with a convex rectangular key in an inner hole according to any one of claims 1-4, characterized in that a plurality of transmission teeth are uniformly distributed on the outer wall of the sleeve body in the circumferential direction.