Motor rotor assembly and motor combination

Abstract

The utility model discloses a motor rotor assembly component and motor combination, the motor rotor assembly component includes: rotor, it includes pivot, the pivot has opposite first end and second end along the axial direction, first bearing, it rotationally supports first end, and second bearing, it rotationally supports second end, the motor still includes the elastic gasket of the sleeve setting in the outer periphery of pivot, the position of pivot is formed with first step portion close to first end, and the elastic gasket is abutted between first step portion and first bearing.

Description

Technical Field

[0001] This utility model relates to power devices, and more particularly to a motor rotor assembly assembly, and a motor assembly using the rotor assembly assembly. Background Technology

[0002] An electric motor typically includes the following components: a stator, the stationary part of the motor, usually composed of a stator core (made of stacked silicon steel sheets to reduce iron loss) and stator windings (coils that generate a magnetic field when current is passed through them); and a rotor, the rotating part of the motor, composed of a rotor core and rotor windings (or permanent magnets, squirrel cage bars, etc.), which generate electromagnetic force or induced current under the action of the stator magnetic field to achieve rotation, and its two ends are supported by bearings.

[0003] Due to differences in assembly precision and component dimensions, the rotor may move axially between the two bearings, generating noise. A common solution is to have one end of the rotor abut against the bearing, while the other end has a preload spring. This can be achieved by forming an annular step at the rotor end, with the preload spring positioned between the step and the bearing, or by placing the preload spring between the bearing and the housing. After assembly, the preload spring remains compressed, providing axial pressure to the rotor and preventing movement. See, for example, Chinese Patent Application No. 202223539789.7, which discloses a motor.

[0004] This existing technology requires a large preload force on the rotor axis, which necessitates increasing the number of coils or wire diameter of the preload spring. This results in a greater force being applied to the spring during assembly, while maintaining the same operation. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a motor rotor assembly that addresses the shortcomings of the prior art, and can provide a large preload force in a small space, and is simple to assemble.

[0006] The second technical problem to be solved by this utility model is to provide a motor assembly that uses the above-mentioned rotor assembly components.

[0007] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a motor rotor assembly, comprising:

[0008] A rotor, comprising a shaft having a first end and a second end opposite each other along an axial direction;

[0009] A first bearing, which rotatably supports the first end; and

[0010] The second bearing provides rotatable support to the second end.

[0011] Its features are:

[0012] The motor also includes an elastic washer sleeved on the outer periphery of the rotating shaft. A first step is formed on the rotating shaft near the first end. The elastic washer abuts against the first step and the first bearing.

[0013] Using elastic washers instead of springs can provide greater deformation capacity in a smaller space to apply sufficient preload to the rotor, and assembly is simple.

[0014] Furthermore, the elastic washer is shaped as follows: the elastic washer includes an annular retaining ring, and a first washer and a plurality of second washers are formed along the inner periphery of the retaining ring. The first washer is inclined from the inner periphery of the retaining ring toward the first bearing, and the first washer abuts against the end face of the first bearing facing the first step. The second washer is inclined from the inner periphery of the retaining ring toward the first step, and the second washer abuts against the first step. This allows for convenient contact with shafts and bearings.

[0015] Furthermore, to facilitate the application of a uniform force in the circumferential direction, the first gasket and the second gasket are each provided in multiples, and the first gasket and the second gasket are arranged alternately along the inner circumference of the retaining ring.

[0016] Preferably, to ensure the deformation capability of the first gasket and the second gasket, both the first gasket and the second gasket are fan-shaped.

[0017] Preferably, the outer diameter of the retaining ring is not greater than the outer diameter of the first bearing, so as to avoid the outer periphery of the retaining ring from going beyond the first bearing and potentially hitting other places, causing the elastic washer to tilt.

[0018] Preferably, the thickness of the retaining ring is d, and satisfies 0.1≤d≤0.5mm, and the maximum thickness of the elastic gasket in its natural state is d0, and satisfies 2mm≤d0≤5mm.

[0019] Furthermore, to prevent the shaft from moving away from the first bearing, a second step is formed near the second end of the shaft, and the second step abuts against the side of the second bearing facing the first bearing.

[0020] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a motor assembly, characterized in that: it applies the motor rotor assembly component as described above.

[0021] Furthermore, to fix the positions of the two bearings, the motor assembly also includes a stator and fixed seats at both ends of the stator. Each bearing corresponds to one fixed seat, and each bearing is inserted into the corresponding fixed seat, with the fixed seat restricting its axial and radial positions.

[0022] Compared with the prior art, the advantages of this utility model are: using elastic washers instead of springs can provide greater deformation capacity in a smaller space to apply sufficient preload to the rotor, and the assembly is simple. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the motor according to an embodiment of the present utility model;

[0024] Figure 2 This is a cross-sectional view of the motor according to an embodiment of the present utility model;

[0025] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0026] Figure 4 This is an assembly diagram of the rotor, bearing, and gasket of the motor according to an embodiment of the present invention;

[0027] Figure 5 This is an exploded structural diagram of the rotor, bearing, and gasket of the motor according to an embodiment of the present utility model;

[0028] Figure 6 This is a perspective view of the motor gasket according to an embodiment of the present utility model;

[0029] Figure 7 This is a side view of the pad of the motor according to an embodiment of the present invention. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0032] See Figures 1-6 An electric motor assembly includes a rotor 1, a stator 2, a first bearing 31, and a second bearing 32. Sheaths 4 are fixed to both axial ends of the stator 2. The rotor 1, the first bearing 31, and the second bearing 32 constitute a rotor assembly. The rotor 1 passes through the middle of the stator 2 and includes a shaft 11. The shaft 11 has a first end 111 and a second end 112 that are axially opposed. The first end 111 is rotatably supported by the first bearing 31, and the second end 112 is rotatably supported by the second bearing 32. The first end 111 is used to output torque to an external load.

[0033] The motor also includes an elastic washer 5, which is sleeved on the outer circumference of the rotating shaft 11, replacing the spring of the prior art. The elastic washer 5 includes an annular retaining ring 51, and a plurality of first washers 52 and a plurality of second washers 53 are formed along the inner periphery of the retaining ring 51. The first washers 52 and the second washers 53 can be staggered along the inner circumference of the retaining ring 51, that is, along the circumferential direction, the two washers adjacent to the first washers 52 are the second washers 53, and the two washers adjacent to the second washers 53 are the first washers 52. The first washers 52 and the second washers 53 can be selected according to the deformation force requirements. In this embodiment, there are three first washers 52 and three second washers 53, and each washer is evenly spaced along the circumferential direction. The first washers 52 and the second washers 53 are both fan-shaped.

[0034] A first step 113 is formed near the first end 111 of the rotating shaft 11, so that the outer diameters of the rotating shaft 11 are not completely equal. An elastic washer 5 is disposed between the first step 113 of the rotating shaft 11 and the first bearing 31. The first washer 52 is inclined from the inner periphery of the retaining ring 51 toward the first bearing 31 and abuts against the end face of the first bearing 31 toward the first step 113. The second washer 53 is inclined from the inner periphery of the retaining ring 51 toward the first step 113 and abuts against the first step 113. The first washer 52 and the second washer 53 deform under pressure, such as reducing the degree of inclination (reducing the inclination angle with the radial plane of the retaining ring 51).

[0035] A second step portion 114 is formed near the second end 112 of the rotating shaft 11, so that the outer diameter of the rotating shaft 11 is not completely equal. The second step portion 114 and the second bearing 32 abut against the side facing the first bearing 31, restricting the axial position of the rotating shaft 11.

[0036] To define the positions of the first bearing 31 and the second shaft 32, a fixing seat 6 is fixedly provided inside each sheath 4. The two can be two independent parts connected and fixed together, or they can be a single piece. Each bearing corresponds to one fixing seat 6. The fixing seat 6 is a sleeve-shaped structure with one axial end open. Each bearing is inserted into the corresponding fixing seat 6 from the opening. The other axial end of the fixing seat 6 can be open or closed, as long as it can abut against the end of each bearing away from the corresponding step, so as to limit the axial position of each bearing. The outer circumference of each bearing also abuts against the inner circumference of the fixing seat 6, thereby limiting the radial position of each bearing (bearing outer ring).

[0037] See Figure 7 The thickness of the retaining ring 51 (thickness refers to the dimension along the axial direction of the rotor 1 in the installed state) is d, and satisfies 0.1≤d≤0.5mm, preferably 0.2≤d≤0.3mm. The maximum thickness of the elastic pad 5 as a whole in its natural state (the stretched state of each pad without force) is d0, and satisfies 2mm≤d0≤5mm, preferably d0=3mm in this embodiment. The outer diameter of the retaining ring 51 is not greater than the outer diameter of the first bearing 31, so as to avoid the outer periphery of the retaining ring 51 extending beyond the first bearing 31 and possibly hitting other places, causing the elastic pad 5 to tilt and thus be unable to apply force normally.

[0038] In this invention, an elastic washer 5 is used instead of the existing spring, which can provide a large elastic deformation force within a deformation range of 3mm, and is easy to assemble.

Claims

1. A motor rotor assembly, comprising: The rotor (1) includes a shaft (11) having a first end (111) and a second end (112) opposite each other along the axial direction; A first bearing (31) rotatably supports the first end (111); and The second bearing (32) provides rotatable support for the second end (112); Its features are: The motor also includes an elastic washer (5) sleeved on the outer periphery of the rotating shaft (11). The rotating shaft (11) has a first step portion (113) formed near the first end (111). The elastic washer (5) abuts between the first step portion (113) and the first bearing (31).

2. The motor rotor assembly according to claim 1, characterized in that: The elastic pad (5) includes an annular retaining ring (51). The inner periphery of the retaining ring (51) forms a first pad (52) and a plurality of second pads (53). The first pad (52) is inclined from the inner periphery of the retaining ring (51) toward the first bearing (31) and the first pad (52) is held in contact with the end face of the first bearing (31) toward the first step (113). The second pads (53) are inclined from the inner periphery of the retaining ring (51) toward the first step (113) and the second pads (53) are held in contact with the first step (113).

3. The motor rotor assembly according to claim 2, characterized in that: The first gasket (52) and the second gasket (53) are each multiple, and the first gasket (52) and the second gasket (53) are arranged alternately along the inner periphery of the retaining ring (51).

4. The motor rotor assembly according to claim 2, characterized in that: Both the first gasket (52) and the second gasket (53) are fan-shaped.

5. The motor rotor assembly according to any one of claims 2 to 4, characterized in that: The outer diameter of the retaining ring (51) is not greater than the outer diameter of the first bearing (31).

6. The motor rotor assembly according to any one of claims 2 to 4, characterized in that: The thickness of the retaining ring (51) is d, and satisfies 0.1≤d≤0.5mm. The maximum thickness of the elastic pad (5) in its natural state is d0, and satisfies 2mm≤d0≤5mm.

7. The motor rotor assembly according to claim 1, characterized in that: The shaft (11) has a second step (114) formed near the second end (112), and the second step (114) and the second bearing (32) abut against the side of the first bearing (31).

8. A motor assembly, characterized in that: The application uses the motor rotor assembly as described in any one of claims 1 to 7.

9. The motor assembly according to claim 8, characterized in that: The motor assembly also includes a stator (2) and fixed seats (6) fixed at both ends of the stator (2). Each bearing corresponds to a fixed seat (6), and each bearing is inserted into the corresponding fixed seat (6) and its axial and radial positions are restricted by the fixed seat (6).

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