Motor shaft sleeve

Abstract

The utility model provides a motor shaft sleeve which comprises a shaft sleeve body. The shaft sleeve body is provided with a shaft hole connected with a motor shaft. A plurality of protruding blocks which are evenly distributed in the circumferential direction at intervals and extend in the radial direction are arranged on the inner circumferential wall of the shaft hole, and the protruding blocks are used for extruding the outer circumferential wall of the motor shaft when the motor shaft is connected into the shaft hole, so that the motor shaft is tightly matched in the shaft sleeve body. When the motor shaft is inserted into the shaft hole, the motor shaft extrudes the protruding block and enables the protruding block to be bent and deformed upwards, the deformed protruding block can also generate extrusion force on the peripheral wall of the motor shaft, and therefore the shaft sleeve body is firmly fixed to the motor shaft. Due to the fact that the protruding blocks can be easily extruded and deformed, the radial extending width of the protruding blocks can be set to be slightly larger, even if the inner diameter of the shaft hole of the shaft sleeve body is slightly increased due to high temperature, the protruding blocks can still generate enough extrusion force on the peripheral wall of the motor shaft, the assembling difficulty is not affected, and assembling is still easy and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor shaft sleeve. Background Art

[0002] The motor sleeve is a component installed on the motor shaft to support the bearing. One end of the sleeve fits snugly against one side of the motor shaft, while the other end mates with the bearing. It is an essential component on the motor shaft and plays a crucial role. First, the sleeve provides solid support for the motor shaft, ensuring stability during rotation and effectively reducing vibration, thereby significantly improving the motor's operating efficiency. Second, it protects the motor shaft surface, preventing wear and damage caused by contact and friction, thereby protecting the motor's overall performance and extending its service life. Furthermore, the sleeve reduces friction and noise, reducing friction between the shaft and bearing, lowering energy consumption, and alleviating noise pollution. In certain circumstances, it also acts as a seal, preventing dust and other impurities from entering the motor interior, ensuring its proper operation.

[0003] The existing motor shaft sleeve generally includes a cylindrical shaft sleeve body, the shaft sleeve body is provided with a shaft hole for connecting the motor shaft, and the inner circumferential wall of the shaft hole is circumferentially spaced with convex surfaces (such as Figure 4 (As shown), when the motor shaft is inserted into the shaft hole, the convex surface squeezes the outer wall of the motor shaft, thereby fixing the sleeve body to the motor shaft. Because the motor sleeve is made of metal or plastic, it is easily affected by the ambient temperature and causes thermal expansion and contraction. In high-temperature environments, the inner diameter of the motor sleeve will increase slightly, which can easily cause the connection between the motor shaft and the sleeve to loosen, affecting the stability of the motor during operation. Increasing the thickness of the convex surface to avoid this situation increases the difficulty of assembly, especially in low-temperature environments, where the inner diameter of the motor sleeve will decrease slightly, further exacerbating the difficulty of assembly and significantly reducing assembly efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned prior art and provide a motor shaft sleeve which is easy to assemble and firmly connected to the motor shaft.

[0005] The technical solution of the present utility model is to provide a motor sleeve with the following structure: comprising a sleeve body, the sleeve body being provided with an axial hole for connecting the motor shaft; the inner peripheral wall of the axial hole being provided with a plurality of protrusions which are evenly spaced circumferentially and extend radially, the protrusions being used to squeeze the outer peripheral wall of the motor shaft when the motor shaft is connected to the axial hole, so that the motor shaft fits tightly in the sleeve body.

[0006] After adopting the above structure, the motor shaft sleeve of the utility model has the following advantages compared with the prior art:

[0007] The utility model provides a plurality of radially extending protrusions on the inner peripheral wall of the shaft hole. When the motor shaft is inserted into the shaft hole, the protrusions will be squeezed and bent upward and deformed. The deformed protrusions will also generate extrusion force on the outer peripheral wall of the motor shaft, thereby firmly fixing the shaft sleeve body on the motor shaft. During the rotation of the motor, the motor shaft and the shaft sleeve body fit tightly and no relative rotation occurs, thereby eliminating the noise generated by the relative movement of the motor shaft and the shaft sleeve body. Since the protrusions can be easily squeezed and deformed, the radial extension width of the protrusions can be set slightly larger. Even if the inner diameter of the shaft hole of the shaft sleeve body increases slightly due to high temperature, the protrusions can still generate sufficient extrusion force on the outer peripheral wall of the motor shaft without affecting the difficulty of assembly. The assembly is still simple and convenient.

[0008] Preferably, the lower end of the protrusion is provided with an inclined surface, which is arranged upwardly from one end of the protrusion connected to the inner wall of the shaft hole to the other end. The inclined surface has a certain guiding function, making it easier for the motor shaft to be inserted into the shaft hole.

[0009] Preferably, the free end surface of the projection is arranged in a concave arc shape. Since the outer peripheral wall of the motor shaft is cylindrical, when the motor shaft is inserted into the shaft hole, the entire end surface of the free end of the projection will abut against the outer peripheral wall of the motor shaft, thereby ensuring a firm connection between the sleeve body and the motor shaft.

[0010] Preferably, an annular groove is provided in the shaft hole for the projection to be folded into, the upper end surface of the annular groove passes through the top of the shaft sleeve body, and the lower end surface of the annular groove is flush with the upper end surface of the projection. With this arrangement, the projection that is bent and squeezed will partially enter the annular groove, reducing the difficulty of assembly.

[0011] Preferably, there are five protrusions, which are evenly spaced along the inner circumference of the shaft hole. The five protrusions can ensure sufficient squeezing force on the outer circumference of the motor shaft without affecting the difficulty of assembly.

[0012] Preferably, the sleeve body and the projection are integrally formed, which can reduce the number of processing steps, save processing costs, and ensure that the projection is firmly connected to the inner wall of the shaft hole to avoid breakage at the connection.

[0013] Preferably, a guide plane is provided on the inner peripheral wall of the shaft hole between two adjacent protrusions, and the guide plane is aligned with the outer peripheral wall of the motor shaft. Because the inner diameter of the shaft hole is slightly larger than the outer diameter of the motor shaft, the guide plane guides the motor shaft to remain coaxial with the shaft hole during assembly.

[0014] Preferably, a trumpet-shaped guide portion is provided on the lower end surface of the shaft hole, and the inner diameter of the guide portion gradually increases from top to bottom, so as to facilitate the assembly of the motor shaft.

[0015] Preferably, an annular reinforcing rib is provided at the upper end of the outer peripheral wall of the sleeve body to increase the mechanical strength of the sleeve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a half-section view of the present utility model.

[0017] Figure 2 It is a schematic structural diagram of the utility model when viewed from above.

[0018] Figure 3 A cross-sectional view of the motor shaft connected to the sleeve body.

[0019] Figure 4 This is a cross-sectional view of the existing design.

[0020] Description of reference numerals:

[0021] 1. Sleeve body, 11. Shaft hole, 12. Bump, 121. Inclined surface, 13. Annular groove, 14. Guide plane, 15. Guide part, 16. Reinforcement rib, 2. Motor shaft, 3. Convex surface. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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, and therefore cannot be understood as a limitation on the present invention. At the same time, the terms "first", "second", etc. are only used to distinguish the names of the components, and there is no primary and secondary relationship, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown;

[0025] The utility model discloses a motor shaft sleeve, comprising a shaft sleeve body 1, wherein the shaft sleeve body 1 is provided with a shaft hole 11 for connecting a motor shaft 2; a plurality of protrusions 12 which are evenly spaced circumferentially and extend radially are provided on the inner peripheral wall of the shaft hole 11, and the protrusions 12 are used to squeeze the outer peripheral wall of the motor shaft 2 when the motor shaft 2 is connected to the shaft hole 11, so that the motor shaft 2 is tightly fitted in the shaft sleeve body 1.

[0026] When the motor shaft 2 is inserted into the axial hole 11 of the sleeve body 1 from bottom to top, the motor shaft 2 will squeeze the protrusion 12 and bend it upward. The deformed protrusion 12 will also generate an extrusion force on the outer peripheral wall of the motor shaft 2, thereby firmly fixing the sleeve body 1 on the motor shaft 2; since the protrusion 12 can be easily squeezed and deformed, the width of the protrusion 12 (radial direction) can be set slightly larger, so that even if the inner diameter of the axial hole 11 of the sleeve body 1 increases slightly due to high temperature, the protrusion 12 can still generate sufficient extrusion pressure on the outer peripheral wall of the motor shaft 2, and will not affect the difficulty of assembly, and the assembly is still simple and convenient.

[0027] An annular groove 13 is provided in the shaft hole 11 for the protrusion 12 to fold into. The upper end surface of the annular groove 13 passes through the top of the sleeve body 1, and the lower end surface of the annular groove 13 is flush with the upper end surface of the protrusion 12. In this way, the bent and squeezed protrusion 12 will partially enter the annular groove 13, reducing the difficulty of assembly.

[0028] The lower end of the projection 12 is provided with an inclined surface 121, which is inclined upward from one end of the projection 12 connected to the inner wall of the shaft hole 11 to the other end. The inclined surface 121 has a certain guiding function, making it easier for the assembly worker to insert the motor shaft 2 into the shaft hole 11, thereby improving assembly efficiency.

[0029] Since the outer peripheral wall of the motor shaft 2 is cylindrical, after the free end face of the protrusion 12 is set to a concave arc shape, when the motor shaft 2 is inserted into the shaft hole 11, the entire arc-shaped end face of the free end of the protrusion 12 will conflict with the outer peripheral wall of the motor shaft 2, increasing the contact area, thereby ensuring a firm connection between the sleeve body 1 and the motor shaft 2.

[0030] The number of the protrusions 12 can be five, and the five protrusions 12 are evenly spaced along the inner circumferential wall of the shaft hole 11. This ensures that sufficient extrusion pressure is exerted on the outer circumferential wall of the motor shaft 2 without affecting the difficulty of assembly.

[0031] The shaft sleeve body 1 and the protrusion 12 are integrally formed, which can reduce the processing steps and save processing costs. It can also ensure that the protrusion 12 is firmly connected to the inner wall of the shaft hole 11 to avoid breakage at the connection.

[0032] When the motor shaft 2 is inserted into the shaft hole 11 of the sleeve body 1 from bottom to top, in order to avoid the motor shaft 2 cutting off the protrusion 12 from the connection between the protrusion 12 and the inner wall of the shaft hole 11, the inner diameter of the shaft hole 11 will be slightly larger than the outer diameter of the motor shaft 2, which makes it easy for the motor shaft 2 to be out of axial alignment with the shaft hole 11 during assembly; therefore, the utility model provides a guide plane 14 on the inner circumferential wall of the shaft hole 11 between two adjacent protrusions 12, and the guide plane 14 will fit with the outer circumferential wall of the motor shaft 2 during assembly, playing a guiding role, thereby ensuring that the motor shaft 2 can always be coaxial with the shaft hole 11 during assembly.

[0033] The lower end surface of the shaft hole 11 is provided with a trumpet-shaped guide portion 15, the inner diameter of which gradually increases from top to bottom to facilitate the assembly of the motor shaft 2. The upper end of the outer peripheral wall of the sleeve body 1 is provided with an annular reinforcement rib 16 for increasing the mechanical strength of the sleeve body 1.

[0034] The above is only a specific implementation method of the present invention, but the scope of protection of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A motor sleeve, comprising a sleeve body (1), wherein the sleeve body (1) is provided with an axial hole (11) for connecting a motor shaft (2); characterized in that: The inner peripheral wall of the shaft hole (11) is provided with a plurality of protrusions (12) that are evenly spaced in the circumference and extend radially. The protrusions (12) are used to press the outer peripheral wall of the motor shaft (2) when the motor shaft (2) is connected to the shaft hole (11), so that the motor shaft (2) is tightly fitted in the shaft sleeve body (1).

2. The motor sleeve according to claim 1, characterized in that: The lower end of the protrusion (12) is provided with an inclined surface (121), and the inclined surface (121) is arranged to be inclined upward from one end where the protrusion (12) is connected to the inner wall of the shaft hole (11) to the other end.

3. The motor sleeve according to claim 2, characterized in that: The free end surface of the projection (12) is arranged in a concave arc shape.

4. The motor sleeve according to claim 3, characterized in that: An annular groove (13) is provided in the shaft hole (11) for the projection (12) to be folded in. The upper end surface of the annular groove (13) passes through the top of the sleeve body (1), and the lower end surface of the annular groove (13) is flush with the upper end surface of the projection (12).

5. The motor sleeve according to claim 4, characterized in that: There are five protrusions (12) which are evenly spaced and distributed along the inner peripheral wall of the shaft hole (11).

6. The motor sleeve according to claim 1, characterized in that: The shaft sleeve body (1) and the protrusion (12) are integrally formed.

7. The motor sleeve according to claim 1, characterized in that: A guide plane (14) is provided on the inner peripheral wall of the shaft hole (11) between two adjacent protrusions (12), and the guide plane (14) is fitted with the outer peripheral wall of the motor shaft (2).

8. The motor sleeve according to claim 1, characterized in that: The lower end surface of the shaft hole (11) is provided with a trumpet-shaped guide portion (15), and the inner diameter of the guide portion (15) gradually increases from top to bottom.

9. The motor sleeve according to claim 1, characterized in that: An annular reinforcing rib (16) is provided at the upper end of the outer peripheral wall of the sleeve body (1) for increasing the mechanical strength of the sleeve body (1).

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