Bearing preload spring and motor having the same

Abstract

The utility model relates to a bearing preload spring and a motor having the bearing preload spring. The preload spring is installed on the motor. The motor comprises a rolling bearing and a shaft sleeve. The preload spring (2) comprises a coil spring body (21). The coil spring body (21) has vortex ends (22) at two ends. The two vortex ends (22) have smooth spring lines and are in uniform contact with the rolling bearing and the shaft sleeve respectively. Compared with the prior art, the utility model has the advantages that the two end faces of the spring are not easy to slip, the parallelism of the two end faces of the spring is better, the elastic force is applied more evenly, the running concentricity of the rolling bearing is better, the vibration and noise are smaller, etc.

Description

Technical Field

[0001] The utility model relates to a motor, in particular to a bearing preload spring and a motor with the bearing preload spring. Background Art

[0002] In the prior art, coil springs or wave springs are usually used to apply elastic force to the preload of rolling bearings. The manufacturing cost of springs is higher than that of coil springs. In micro motors, the size of rolling bearings is usually small, and wave springs cannot be manufactured. Therefore, micro motors usually use round coil springs with smaller wire diameters placed on the rotating shaft to apply preload to the bearings. Figure 1 As shown. The rolling bearing where the spring is applied needs to be clearance-matched with the rotating shaft so that the spring force can be applied to the bearing at the other end through the rotor. The spring wire diameter is small, and the contact with the supporting surfaces of the two end face parts usually tends to be line contact. The contact surface is extremely small, and due to its spiral structure, the contact surface is less than a full circle, and the static friction force is very small. During the high-speed start-up and operation of the motor, the static friction force cannot drive the bearing to rotate, and the spring and the two ends slip, and the rotating shaft and the inner ring of the bearing slip, etc., resulting in abnormal noise from the motor and rapid wear and failure of the spring.

[0003] After searching, Chinese patent publication number CN202284612U discloses a bearing with axial buffering function, specifically including a bearing left cover and a bearing right cover arranged at intervals, a rolling bearing sleeve is provided between the bearing left cover and the bearing right cover, and an axial preload spring is provided on the bearing right cover. The axial preload spring is against the right end face of the outer ring body. The axial preload spring has self-adjustment ability and can play a buffering role when the air-side bearing device is subjected to axial movement. However, the specific structure of the axial preload spring of the existing patent is not limited, and the above-mentioned problems will also exist.

[0004] Therefore, how to solve the problems of small contact area between the spring and the two supporting surfaces, small static friction, slipping and wear of the spring end faces, and sliding of the rolling bearing and the rotating shaft has become a technical problem to be solved by the utility model. Utility Model Content

[0005] The purpose of the utility model is to provide a bearing preload spring and a motor having the bearing preload spring in order to overcome the defects of the prior art.

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

[0007] According to one aspect of the utility model, a bearing preload spring is provided, which is installed on a motor, wherein the motor comprises a rolling bearing and a shaft sleeve, and the preload spring comprises a coil spring body, wherein the coil spring body has vortex ends at two ends, and the two vortex end spring lines are flat and are in uniform contact with the rolling bearing and the shaft sleeve respectively.

[0008] As a preferred technical solution, the vortex end portion is a spring wire extending in a radial vortex shape.

[0009] As a preferred technical solution, the vortex end is an inner vortex end.

[0010] As a preferred technical solution, the vortex end is an outer spiral vortex end.

[0011] As a preferred technical solution, the vortex end has a spring wire of greater than or equal to 1.5 turns.

[0012] According to another aspect of the utility model, a motor having the bearing preload spring is provided, the motor comprising a rolling bearing A, a preload spring, a sleeve A, a sleeve B, a rotating shaft and a rolling bearing B;

[0013] The rolling bearing A at any end of the motor is clearance-matched with the rotating shaft, and the preload spring is arranged between the rolling bearing A and the rotating shaft;

[0014] The elastic force of the preload spring provides preload for the rolling bearing A, and the elastic force is transmitted to the rolling bearing B at the other end through the sleeve A, the rotating shaft, and the sleeve B at the other end, so that the two rolling bearings are subjected to the same preload force at the same time.

[0015] As a preferred technical solution, gaskets are installed at the two spiral ends of the preload spring.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1) The two end faces of the helical spring of the utility model have added vortex ends of flat coils, and the number of parallel coils of the spring on the end faces is large, such as the local enlargement of the spring preload structure Figure 3 As shown in .2, the end face of the spring is in contact with the pressure-bearing surface for multiple turns, the contact area is larger, and the static friction force is increased several times, making it difficult for the two end faces of the spring to slip;

[0018] 2) The two end surfaces of the spiral spring of the utility model are increased with vortex-shaped short waves of flat circles, the parallelism of the two end surfaces of the spring is better, the elastic force is applied more evenly, the running concentricity of the rolling bearing is better, and the vibration and noise are smaller;

[0019] 3) In a motor using the rolling bearing preload spring of the utility model, the static friction force of the spring end surface is sufficient to drive the inner ring of the bearing and the rotating shaft to rotate synchronously, and the inner ring of the bearing and the rotating shaft do not slip. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a spiral spring of traditional structure;

[0021] Figure 2 The spiral spring structure with an inner vortex-shaped end portion described in the utility model;

[0022] Figure 3 A top view of a coil spring with an inner vortex-shaped end;

[0023] Figure 4 The spiral spring structure with an outer spiral end portion described in the utility model;

[0024] Figure 5 A top view of a helical spring with an outer vortex-shaped end;

[0025] Figure 6 A motor structure using the spring preload of the utility model;

[0026] Figure 7 This is a partial enlarged view of the motor structure with spring preload.

[0027] 1 is rolling bearing A; 2 is preload; 3 is motor rotor; 31 is sleeve A; 32 is magnetic steel; 33 is sleeve B; 34 is rotating shaft; 4 is rolling bearing B;

[0028] 21 is the coil spring body, and 22 is the spiral end. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0030] Example 1

[0031] like Figure 2 and Figure 3 As shown, a bearing preload spring is installed on a motor, the motor includes a rolling bearing and a sleeve, the preload spring 2 includes a coil spring body 21, the coil spring body 21 has vortex ends 22 at both ends, the two vortex ends 22 have flat spring lines and are in uniform contact with the rolling bearing and the sleeve respectively. This embodiment solves the problems of small contact area between the spring and the two supporting surfaces, small static friction, slipping and wear of the spring end surface, and sliding of the rolling bearing and the rotating shaft proposed in the background technology.

[0032] The vortex end 22 is a spring wire extending in a radial spiral shape, and the two vortex end spring wires are flat and have good parallelism, and are in uniform contact with the supporting surfaces at both ends;

[0033] The vortex end 22 is an inner spiral vortex end, and the vortex end 22 has a spring wire greater than or equal to 1.5 turns, which can increase the contact area with the supporting surface and improve the static friction force; more preferably, the maximum number of turns of the spring wire of the vortex end 22 is selected according to actual size requirements.

[0034] Example 2

[0035] like Figure 4 and 5 As shown, a bearing preload spring is installed on a motor, the motor includes a rolling bearing and a sleeve, the preload spring 2 includes a coil spring body 21, the coil spring body 21 has vortex ends 22 at both ends, the two vortex ends 22 have flat spring lines and are in uniform contact with the rolling bearing and the sleeve respectively. This embodiment solves the problems of small contact area between the spring and the two supporting surfaces, small static friction, slipping and wear of the spring end surface, and sliding of the rolling bearing and the rotating shaft proposed in the background technology.

[0036] The vortex end 22 is a spring wire extending in a radial spiral shape, and the two vortex end spring wires are flat and have good parallelism, and are in uniform contact with the supporting surfaces at both ends;

[0037] The vortex end 22 is an outward spiral end, and the vortex end 22 has a spring wire greater than or equal to 1.5 turns, which can increase the contact area with the supporting surface and improve the static friction force; more preferably, the maximum number of turns of the spring wire of the vortex end 22 is selected according to actual size requirements.

[0038] Example 3

[0039] like Figure 6 and 7 As shown, a motor with the bearing preload spring, the motor includes a rolling bearing A1, a preload spring 2, a sleeve A31, a sleeve B33, a rotating shaft 34 and a rolling bearing B4;

[0040] The rolling bearing A1 at either end of the motor is clearance-fitted with the rotating shaft 34, and the preload spring 2 is disposed between the rolling bearing A1 and the rotating shaft 34; the elastic force of the preload spring 2 provides preload for the rolling bearing A1, and the elastic force is transmitted to the rolling bearing B4 at the other end through the sleeve A31, the rotating shaft 34, and the sleeve B33 at the other end, so that the two rolling bearings bear the same preload force at the same time. This embodiment does not limit the placement of the spring at the front end or the rear end, and can be selected according to actual conditions.

[0041] The pitch of the two end faces of the preload spring 2 is gradually reduced until they are close together, so that the two end faces are more parallel and the force-bearing surface is not easy to tilt.

[0042] The spring wire at the spiral end of the preload spring 2 is end-surface-ground, so that the two end surfaces are more parallel, the contact area is larger, the friction coefficient is increased, and the force is more uniform.

[0043] The two spiral ends of the preload spring 2 are provided with gaskets. When assembled in the motor, the two end faces are provided with gaskets to achieve a better preload effect.

[0044] In the motor using the rolling bearing preload spring of this embodiment, the static friction force of the spring end surface is sufficient to drive the inner ring of the bearing and the rotating shaft to rotate synchronously, and the inner ring of the bearing and the rotating shaft do not slip.

[0045] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A bearing preload spring, the preload spring is mounted on a motor, the motor comprises a rolling bearing and a sleeve, characterized in that: The preload spring (2) comprises a coil spring body (21), the coil spring body (21) having vortex ends (22) at two ends, the two vortex ends (22) having smooth spring lines and respectively in uniform contact with the rolling bearing and the shaft sleeve.

2. A bearing preload spring according to claim 1, characterized in that: The spiral end portion (22) is a spring wire extending in a spiral shape in the radial direction.

3. A bearing preload spring according to claim 1, characterized in that: The vortex end (22) is an inner vortex end.

4. A bearing preload spring according to claim 1, characterized in that: The vortex end (22) is an outer spiral vortex end.

5. A bearing preload spring according to claim 1, characterized in that: The spiral end portion (22) has a spring wire of greater than or equal to 1.5 turns.

6. A motor having the bearing preload spring according to claim 1, characterized in that: The motor comprises a rolling bearing A (1), a preload spring (2), a shaft sleeve A (31), a shaft sleeve B (33), a rotating shaft (34) and a rolling bearing B (4); The rolling bearing A (1) at either end of the motor is clearance-fitted with the rotating shaft (34), and the preload spring (2) is arranged between the rolling bearing A (1) and the rotating shaft (34); The elastic force of the preload spring (2) provides preload for the rolling bearing A (1), and the elastic force is transmitted to the rolling bearing B (4) at the other end through the shaft sleeve A (31), the rotating shaft (34), and the shaft sleeve B (33) at the other end, so that the two rolling bearings are subjected to the same preload force at the same time.

7. The motor according to claim 6, characterized in that Gaskets are installed at the two spiral ends of the preload spring (2).

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