Motor with bearing fixing structure

Abstract

This utility model relates to a motor with a bearing fixing structure. The motor includes a housing (1), a bearing end cover (2), a rear bearing (4), a rotating shaft (6), and a front bearing (7). The front bearing (7) mates with the housing (1), and the rear bearing (4) mates with the bearing end cover (2). The housing (1) has a first conical surface (101), and the bearing end cover (2) has a second conical surface (201) that mates with the first conical surface (101). An axial force causes the first conical surface (101) and the second conical surface (201) to slide relative to each other to eliminate radial clearance. Compared with the prior art, this utility model has the advantages of effectively eliminating the radial and axial clearance of the bearing, making the entire bearing system stable and reliable, and reducing the shaft runout.

Description

Technical Field

[0001] This utility model relates to an electric motor, and more particularly to an electric motor with a bearing fixing structure. Background Technology

[0002] An electric motor is an electromagnetic device that converts electrical energy into mechanical energy based on the law of electromagnetic induction, such as... Figure 1 As shown, the existing motor product includes a housing 1, a bearing end cover 2, a rear bearing 4, a rotating shaft 6, and a front bearing 7. The front bearing 7 is fitted with the housing 1, and the rear bearing 4 is fitted with the bearing end cover 2. The two bearings eliminate axial clearance through an outer ring washer 5 and an inner ring washer 8. The outer ring of the rear bearing is fixed to the housing 1 by the bearing end cover 2 and the housing 1 by screws 3 arranged circumferentially. In this structure, the bearing end cover 2 has a clearance fit with the housing 1 and a clearance fit with the outer ring of the rear bearing 4. In addition, since there is also clearance during the tightening process of the screws and threads, there are multiple clearances in the radial direction of the entire bearing system. Ultimately, this causes the shaft 6 to have excessive runout during rotation, resulting in unstable operation.

[0003] A search of Chinese Patent Publication No. CN206592440U reveals a fixing structure for an end-cap bearing, including an outer bearing ring, an inner bearing ring, and steel balls. After assembly, the outer bearing ring, inner bearing ring, and steel balls are mounted on a shaft, and the bearing is axially fixed by a locking nut. An elastic element is provided between the locking nut and the inner bearing ring, and this elastic element is sleeved on the shaft. This prior art patent uses the elastic element to generate an axial preload force pushing against the inner bearing ring. When the operating temperature rises and the shaft expands due to heat, causing the inner bearing ring to move towards the locking nut, the preload force of the elastic element prevents this displacement, ensuring that the inner and outer bearing rings do not move relative to each other. However, this prior art patent still fails to solve the problem of multiple radial clearances in the bearing system, leading to unstable motor operation.

[0004] Therefore, how to better eliminate the radial clearance of the bearing system has become a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of this invention is to overcome the defects of the existing technology and provide a motor with a bearing fixing structure.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a motor with a bearing fixing structure is provided. The motor includes a housing, a bearing end cover, a rear bearing, a rotating shaft, and a front bearing. The front bearing is fitted with the housing, and the rear bearing is fitted with the bearing end cover. The housing is provided with a first conical surface, and the bearing end cover is provided with a second conical surface that fits with the first conical surface. An axial force is used to make the first conical surface and the second conical surface slide relative to each other to eliminate radial clearance.

[0008] As a preferred technical solution, the first and second conical surfaces have the same taper.

[0009] As a preferred technical solution, the motor further includes an elastic element that provides axial elastic force between the front bearing and the housing.

[0010] As a preferred technical solution, the motor further includes an elastic element that provides axial elastic force between the rear bearing and the bearing end cover.

[0011] As a preferred technical solution, the motor further includes elastic elements that provide axial elastic force, respectively disposed between the outer ring of the front bearing and the housing, and between the outer ring of the rear bearing and the bearing end cover.

[0012] As a preferred technical solution, the elastic element is a spring or a wave washer.

[0013] As a preferred technical solution, the axial force is generated by fasteners connecting the housing and the bearing end cover.

[0014] As a preferred technical solution, the fastener is a screw.

[0015] As a preferred technical solution, the screws are arranged circumferentially along the housing.

[0016] As a preferred technical solution, an outer ring washer and an inner ring washer are provided between the rear bearing and the front bearing.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1) In the fit between the housing and the bearing end cover, the present invention uses a conical fit instead of the traditional cylindrical clearance fit. When assembled, the two conical fit surfaces are in complete contact, and an axial force is used to make the conical surfaces slide relative to each other, thereby eliminating the radial clearance between the housing and the bearing end cover and between the rear bearing and the bearing end cover.

[0019] 2) This utility model introduces an elastic element that can provide axial elastic force between the front bearing and the housing, and / or between the rear bearing and the bearing end cover, to eliminate the axial gap between the two bearings and adjacent components.

[0020] 3) The elastic element of this utility model is preferably a spring or a wave washer, which applies a reaction force to the bearing during compression, effectively eliminating the axial gap between the bearing and adjacent components;

[0021] 4) This utility model uses conical surfaces with the same taper and uses screws to provide relative axial force between the bearing end cover and the housing, so as to eliminate the radial clearance between the bearing end cover and the housing and between the rear bearing and the bearing end cover, so that the motor can always maintain a stable operating state.

[0022] 5) This utility model effectively eliminates the radial and axial clearances of the bearing by using one or more methods such as tapered surface fit, elastic element, and / or inner and outer ring gaskets, making the entire bearing system stable and reliable, which helps to reduce the shaft runout. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an existing motor;

[0024] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0025] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of this utility model;

[0027] 1 is the housing, 2 is the bearing end cover, 3 is the screw, 4 is the rear bearing, 5 is the outer ring washer, 6 is the shaft, 7 is the front bearing, 8 is the inner ring washer, 9 is the elastic element, 101 is the first conical surface, and 201 is the second conical surface. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0029] Example 1

[0030] like Figure 2As shown, the motor of this utility model includes a housing 1, a bearing end cover 2, a rear bearing 4, a rotating shaft 6, and a front bearing 7. The front bearing 7 mates with the housing 1, and the rear bearing 4 mates with the bearing end cover 2. The housing 1 has a first conical surface 101, and the bearing end cover 2 has a second conical surface 201 that mates with the first conical surface 101. During installation, an axial force is applied to allow relative sliding between the first conical surface 101 and the second conical surface 201, thereby eliminating the radial clearance between the housing 1 and the bearing end cover 2, and between the rear bearing 4 and the bearing end cover 2. In other words, this utility model uses a conical surface fit instead of the traditional cylindrical surface clearance fit in the housing and bearing end cover fit. When assembled, the two conical mating surfaces are in complete contact, eliminating the radial clearance. This solves the problem of radial clearance generated by the cylindrical surface clearance fit in the prior art. Specifically, the inclined structure of the conical surface converts the axial force into a radial force, allowing the housing 1 and the bearing end cover 2 to undergo radial displacement and eliminating all radial clearance.

[0031] To further improve the radial clearance elimination effect, this invention sets the taper of the first conical surface 101 and the second conical surface 201 to be the same, and uses the tightening process of fasteners (preferably screws 3) to gradually reduce the distance between the bearing end cover and the housing until the mating surfaces are in complete contact, thereby achieving the optimal radial clearance elimination effect.

[0032] In this embodiment, the specific principle by which the conical surface can eliminate radial clearance compared to a flat surface is as follows:

[0033] If the housing and bearing end cover use a simple cylindrical surface plus end face fit, no matter how high the machining accuracy is, there will always be a gap at the microscopic level. When the bolts are tightened, only the end face is subjected to force, and there may be a radial gap between the cylindrical surfaces, which will lead to inaccurate positioning, poor rigidity, and easy loosening.

[0034] When the mating surfaces change from cylindrical surfaces to conical surfaces (usually one is an outer conical surface and the other is an inner conical surface), the situation changes fundamentally:

[0035] When an axial force (Fa) is applied by screws or other means to press the housing and bearing end cover together, the two conical surfaces slide against each other during the screw tightening or the application of the axial force, which in turn causes radial relative displacement between the bearing end cover and the housing, thereby eliminating the gap.

[0036] In addition, to further improve the clearance elimination effect, this embodiment provides an outer ring washer 5 and an inner ring washer 8 between the rear bearing 4 and the front bearing 7.

[0037] Example 2

[0038] like Figure 3As shown, based on Embodiment 1, the present invention further preferably has an elastic element 9 between the front bearing 7 and the housing 1, wherein one end of the elastic element 9 contacts the outer ring of the front bearing 7 and the other end contacts the housing 1.

[0039] In this embodiment, an elastic element that provides rebound force is introduced between the front bearing and the housing to eliminate the axial clearance of the bearing, thereby eliminating both the radial and axial clearances of the bearing. This makes the entire bearing system stable and reliable, which helps to reduce the spindle runout.

[0040] To further improve the axial clearance elimination effect, the elastic element in this embodiment is preferably a spring or a wave washer, which applies a reaction force to the bearing during compression, thereby greatly eliminating the axial clearance of the bearing.

[0041] The specific implementation process of using springs to eliminate axial clearance is as follows:

[0042] A set of springs is installed on the outside of the bearing assembly. When the springs are compressed, they will continuously apply an axial force to the outer or inner ring of the bearing. This force is transmitted through the bearing and eventually eliminates the gaps inside the entire bearing system and puts it in a preloaded state.

[0043] In addition, the specific implementation process of using corrugated washers to eliminate axial clearance is as follows:

[0044] A wave spring is a thin, sheet-like metal ring with multiple crests and troughs. Placed between the outer ring of a bearing and the end cap, compression of the wave spring generates preload. It typically provides less spring force and travel than a regular spring, making it suitable for light to medium preload requirements.

[0045] In addition, to further improve the clearance elimination effect, this embodiment provides an outer ring washer 5 and an inner ring washer 8 between the rear bearing 4 and the front bearing 7.

[0046] Example 3

[0047] like Figure 4 As shown, based on Embodiment 1, the elastic element 9 between the rear bearing 4 and the bearing end cover 2 is further preferably provided such that one end of the elastic element 9 contacts the outer ring of the rear bearing 4 and the other end contacts the bearing end cover 2.

[0048] This embodiment introduces an elastic element that provides rebound force between the rear bearing and the bearing end cover to eliminate the axial clearance of the bearing, thereby eliminating both the radial and axial clearances of the bearing. This makes the entire bearing system stable and reliable, and helps to reduce the spindle runout.

[0049] To further improve the axial clearance elimination effect, the elastic element in this embodiment is preferably a spring or a wave washer, which applies a reaction force to the bearing during compression, thereby greatly eliminating the axial clearance of the bearing.

[0050] The specific implementation process of using springs to eliminate axial clearance is as follows:

[0051] A set of springs is installed on the outside of the bearing assembly. When the springs are compressed, they will continuously apply an axial force to the outer or inner ring of the bearing. This force is transmitted through the bearing and eventually eliminates the gaps inside the entire bearing system and puts it in a preloaded state.

[0052] In addition, the specific implementation process of using corrugated washers to eliminate axial clearance is as follows:

[0053] A wave spring is a thin, sheet-like metal ring with multiple crests and troughs. Placed between the outer ring of a bearing and the end cap, compression of the wave spring generates preload. It typically provides less spring force and travel than a regular spring, making it suitable for light to medium preload requirements.

[0054] In addition, to further improve the clearance elimination effect, this embodiment provides an outer ring washer 5 and an inner ring washer 8 between the rear bearing 4 and the front bearing 7.

[0055] Example 4

[0056] Based on Embodiment 1, this utility model includes an elastic element 9 between the front bearing 7 and the housing 1, with one end of the elastic element 9 contacting the outer ring of the front bearing 7 and the other end contacting the housing 1; simultaneously, an elastic element 9 between the rear bearing 4 and the bearing end cover 2, with one end of the elastic element 9 contacting the outer ring of the rear bearing 4 and the other end contacting the bearing end cover 2.

[0057] In this embodiment, elastic elements that provide rebound force are introduced between the front bearing and the housing, and between the rear bearing and the bearing end cover, to eliminate the axial clearance of the bearing, thereby eliminating both the radial and axial clearances of the bearing. This makes the entire bearing system stable and reliable, and helps to reduce the spindle runout.

[0058] To further improve the axial clearance elimination effect, the elastic element in this embodiment is preferably a spring or a wave washer, which applies a reaction force to the bearing during compression, thereby greatly eliminating the axial clearance of the bearing.

[0059] The specific implementation process of using springs to eliminate axial clearance is as follows:

[0060] A set of springs is installed on the outside of the bearing assembly. When the springs are compressed, they will continuously apply an axial force to the outer or inner ring of the bearing. This force is transmitted through the bearing and eventually eliminates the gaps inside the entire bearing system and puts it in a preloaded state.

[0061] In addition, the specific implementation process of using corrugated washers to eliminate axial clearance is as follows:

[0062] A wave spring is a thin, sheet-like metal ring with multiple crests and troughs. Placed between the outer ring of a bearing and the end cap, compression of the wave spring generates preload. It typically provides less spring force and travel than a regular spring, making it suitable for light to medium preload requirements.

[0063] In addition, to further improve the clearance elimination effect, this embodiment provides an outer ring washer 5 and an inner ring washer 8 between the rear bearing 4 and the front bearing 7.

[0064] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An electric machine with a bearing fixing structure, the electric machine comprising a machine housing (1), a bearing end cover (2), a rear bearing (4), a rotating shaft (6) and a front bearing (7), the front bearing (7) being fitted to the machine housing (1) and the rear bearing (4) being fitted to the bearing end cover (2), characterized in that, The housing (1) is provided with a first conical surface (101), and the bearing end cover (2) is provided with a second conical surface (201) that cooperates with the first conical surface (101). An axial force is used to make the first conical surface (101) and the second conical surface (201) slide relative to each other to eliminate radial clearance.

2. The electric motor with bearing fixation structure according to claim 1, characterized in that, The first conical surface (101) and the second conical surface (201) have the same taper.

3. The electric motor with bearing fixation structure according to claim 1, characterized in that, The motor also includes an elastic element (9) that provides axial elastic force between the front bearing (7) and the housing (1).

4. The electric motor with bearing fixation structure according to claim 1, characterized in that, The motor also includes an elastic element (9) that provides axial elastic force between the rear bearing (4) and the bearing end cover (2).

5. The electric motor with bearing fixation structure according to claim 1, characterized in that, The motor also includes elastic elements (9) that provide axial elastic force, respectively disposed between the front bearing (7) and the housing (1) and between the rear bearing (4) and the bearing end cover (2).

6. The electric machine with bearing fixation structure according to any of claims 3-5, characterized in that, The elastic element (9) is a spring or a wave washer.

7. The electric motor with bearing retention structure of claim 1, wherein, The axial force is generated by fasteners connecting the housing (1) and the bearing end cap (2).

8. The electric motor with bearing fixation structure according to claim 7, characterized in that, The fastener is a screw (3).

9. The electric motor with bearing fixation structure according to claim 8, characterized in that, The screws (3) are arranged circumferentially along the housing (1).

10. The electric motor with bearing retention structure of claim 1, wherein, An outer ring washer (5) and an inner ring washer (8) are provided between the rear bearing (4) and the front bearing (7).

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