Motor rotor structure

Abstract

The invention relates to the technical field of motor structures, and discloses a motor rotor structure, and the structure comprises a rotor which is provided with an iron core, and the iron core is provided with an axial lead; the supporting piece is provided with a first base body and a connecting part, and at least part of the outer wall of the connecting part is obliquely arranged towards the side close to the axis in the direction close to the first base body, so that a first inclined plane is formed; the elastic ring is provided with a ring hole in a penetrating mode, the elastic ring surrounds the ring hole to form an inner ring face, and the inner ring face is an inclined face. The inner ring surface is attached to the first inclined surface; one side of the elastic ring deviating from the first inclined surface forms an outer ring surface; the pressing piece is propped against the outer ring surface of the elastic ring; according to the motor rotor structure provided by the invention, the first inclined surface is matched with the inner ring surface, the counter-acting force which is vertical to the contact surface and is applied to the elastic ring by the connecting part is decomposed into two component forces, and one component force enables the elastic ring to move towards the direction close to the iron core and enables the elastic ring to abut against the iron core, so that the length tolerance of the iron core is effectively compensated; and an effective and good limiting effect on the iron core is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of motor structures, and in particular to a motor rotor structure. Background Art

[0002] The motor rotor structure includes a motor rotor and a motor rotor support structure. The motor rotor includes a rotor core and a magnet structure. The motor rotor support structure is used to fix the rotor position to ensure its stability and coaxiality during rotation.

[0003] In the related art, the motor rotor support structure uses retaining rings and shaft shoulders to limit the rotor core axially. However, the rotor core is made of stacked silicon steel sheets. After stacking, the rotor core generally has a length tolerance of 1mm to 2mm in the axial direction. However, the retaining rings and shaft shoulders are fixed in axial position, making it difficult to accurately align with the rotor core, and in fact, the rotor core is not effectively limited. Summary of the Invention

[0004] The object of the present invention is to provide a motor rotor structure to solve the problem in the prior art that the rotor core has tolerance in the axial direction after being laminated, making it difficult to effectively limit the rotor core.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A motor rotor structure comprises: a rotor having an iron core, wherein the iron core has an axial centerline; a support member having a first base and a connecting portion connected thereto, wherein the rotor is sleeved on the first base; at least a portion of an outer wall of the connecting portion is inclined toward a side close to the axial centerline in a direction close to the first base, thereby forming a first inclined surface; an elastic ring having a ring hole extending therethrough, wherein the elastic ring forms an inner ring surface around the ring hole, wherein the inner ring surface is an inclined surface; the elastic ring is sleeved on the connecting portion, wherein the inner ring surface is fitted against the first inclined surface; an outer ring surface is formed on the side of the elastic ring facing away from the first inclined surface; a pressing member is arranged in contact with at least the outer ring surface of the elastic ring, and is suitable for causing one end of the elastic ring along the axial direction to contact the iron core.

[0007] According to the above technical means, a connecting portion is provided at the support member, and a first inclined surface is formed and provided at at least part of the outer wall of the connecting portion. The inclination direction of the first inclined surface is toward the direction close to the first base body, and is inclined toward the side close to the axial centerline, so that when the first inclined surface cooperates with the inner ring surface of the elastic ring, the reaction force Fn applied by the connecting portion to the elastic ring perpendicular to the contact surface can be effectively decomposed into a first component force F1 and a second component force F2. The first component force F1 obtained by decomposition causes the elastic ring to displace toward the direction close to the iron core, and then the elastic ring is pressed against the iron core. With the help of the displacement of the elastic ring, the length tolerance of the iron core in the axial direction is effectively compensated. At the same time, with the help of the first component force F1, the elastic ring is pressed against the iron core to ensure an effective and good limiting effect on the iron core.

[0008] Furthermore, in a cross section of the motor rotor structure along the axis, an inclination angle of the first inclined surface relative to the direction of the axis is θ1, wherein 5°≤θ1≤7°.

[0009] According to the above technical means, the value range of the inclination angle θ1 is 5°≤θ1≤7°. With such a setting, on the one hand, since the inclination direction and angle of the inner ring surface are the same as those of the first inclined surface, it is avoided that the first component force F1 is too small due to the inclination angle θ1 being too small, affecting the elastic ring 3's tight and limiting effect on the iron core; on the other hand, it is avoided that the inclination degree of the inner ring surface and the first inclined surface is too large due to the inclination angle θ1 being too large, which causes local stress concentration in the connecting part and the elastic ring, affecting the service life; furthermore, the inclination angles of the first inclined surface and the inner ring surface are within a reasonable range, ensuring that the magnitude of the first component force F1 is within an appropriate range, and the elastic ring is stably pressed against the iron core.

[0010] Furthermore, the clamping member includes a main body and a clamping portion connected to one end of the main body along the axial direction, and the main body is sleeved on the connecting portion; the outer ring surface is inclined toward the side away from the axial centerline along the direction close to the iron core; the clamping portion has a second inclined surface on the side facing the connecting portion, and the inclination direction and angle of the second inclined surface are the same as those of the outer ring surface; the clamping portion abuts the outer ring surface, and the second inclined surface is fitted against the outer ring surface.

[0011] According to the above technical means, compared with the inner ring surface which is inclined toward the side close to the axial centerline, the outer ring surface is inclined toward the side away from the axial centerline, which is opposite to the inclination direction of the inner ring surface. In this way, when the clamping piece is gradually moved toward the direction close to the iron core to install the clamping piece, the distance from the second inclined surface to the connecting part gradually decreases, and the elastic ring is gradually compressed by the clamping part, converting the axial movement of the clamping piece into radial contraction of the elastic ring, ensuring that the elastic ring is set tightly against the iron core.

[0012] Furthermore, in a cross section of the motor rotor structure along the axis, an inclination angle of the outer annular surface relative to the direction of the axis is θ2, wherein 5°≤θ2≤7°.

[0013] According to the above technical means, the value range of the inclination angle θ2 is 5°≤θ2≤7°. With such a setting, on the one hand, as the clamping part moves, the elastic ring is gradually compressed by the clamping part, thereby avoiding the compression degree of the elastic ring by the clamping part being small due to the inclination angle θ2 being too small, and then the elastic force of the elastic ring on the connecting part being small, affecting the magnitude of the reaction force Fn of the connecting part on the elastic ring, and then affecting the abutment and limiting effect of the elastic ring on the iron core. On the other hand, it avoids the inclination degree of the outer ring surface and the second inclined surface being too large due to the inclination angle θ1 being too large, thereby causing local stress concentration on the clamping part and the elastic ring, affecting the service life; and then, the inclination angles of the second inclined surface and the outer ring surface are within a reasonable range, ensuring that the elastic ring is stably pressed against the iron core.

[0014] Furthermore, the elastic ring includes a ring portion and an elastic arm connected to one axial end of the ring portion, the ring portion is sleeved on the connecting portion, and the elastic arm is abutted against the iron core.

[0015] According to the above technical means, by setting a ring portion and a spring arm connected to one axial end of the ring portion, the spring arm abuts against the iron core. The spring arm has a certain length in the axial direction and is extended in the direction close to the iron core, so that the side of the spring arm away from the ring portion can effectively abut against the iron core, thereby ensuring the limiting effect of the elastic ring.

[0016] Furthermore, at least a portion of the ring body of the ring portion is disconnected, and a first end and a second end are formed at the disconnected position, and the first end and the second end are spaced apart.

[0017] According to the above technical means, the first end and the second end can be close to or far away from each other. On the one hand, when the elastic ring is subjected to the force of the clamping member, space for elastic deformation is provided for the elastic ring. On the other hand, the diameter of the ring portion is variable, and thus the elastic ring can be adapted to be installed in rotor structures of different specifications, with strong compatibility.

[0018] Furthermore, the motor rotor structure further includes a flange, which is fixed to an end of the connecting portion away from the first base, and a side of the main body away from the pressing portion abuts against the flange.

[0019] According to the above technical means, the flange and the support are fastened and fixed. Compared with the flexible limitation of the iron core by the elastic ring, the connecting part and the clamping part, the flange and the clamping part abut to form a rigid limitation, a double-angle and double-surface limitation, which improves the limiting effect of the iron core and is stable and reliable.

[0020] Furthermore, the support member further includes a limiting member, which is connected to the first base and abuts against an end of the iron core away from the elastic ring.

[0021] According to the above technical means, along the radial direction, the limiting member protrudes relative to the outer peripheral surface of the first base, and the protruding portion abuts against the iron core to effectively limit the side of the iron core away from the elastic ring.

[0022] Furthermore, there are multiple limiting members, and the multiple limiting members are arranged around the circumference of the first base body and at intervals.

[0023] According to the above technical means, multiple limiting members are arranged around the circumference of the first base and at intervals, so that the multiple limiting members exert a comprehensive restraining effect on the iron core from different positions, thereby improving the limiting effect on the iron core and preventing the iron core from shifting during the operation of the motor.

[0024] Furthermore, the elastic arms are provided in plurality, and the plurality of elastic arms are arranged circumferentially around the ring portion and at intervals.

[0025] According to the above technical means, multiple elastic arms are arranged around the circumference of the ring and at intervals, so that the multiple elastic arms exert a comprehensive restraining effect on the iron core from different positions, thereby improving the limiting effect on the iron core and preventing the iron core from shifting during the operation of the motor.

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention provides a connecting portion at the support member, and forms a first inclined surface at at least a portion of the outer wall of the connecting portion. The inclination direction of the first inclined surface is toward the direction close to the first base body, and is inclined toward the side close to the axis center line, so that when the first inclined surface cooperates with the inner ring surface of the elastic ring, the reaction force Fn applied by the connecting portion to the elastic ring perpendicular to the contact surface can be effectively decomposed into a first component force F1 and a second component force F2. The first component force F1 obtained by decomposition causes the elastic ring to displace toward the direction close to the iron core, and then the elastic ring is pressed against the iron core. With the help of the displacement of the elastic ring, the length tolerance of the iron core in the axial direction is effectively compensated. At the same time, with the help of the first component force F1, the elastic ring is pressed against the iron core to ensure an effective and good limiting effect on the iron core.

[0028] (2) The present invention selects the value of the inclination angle θ1 within the range of 5°≤θ1≤7°. In this way, on the one hand, since the inclination direction and angle of the inner ring surface are the same as those of the first inclined surface, it is avoided that the first component force F1 is too small due to the inclination angle θ1 being too small, thereby affecting the tight and limiting effect of the elastic ring 3 on the iron core; on the other hand, it is avoided that the inclination degree of the inner ring surface and the first inclined surface is too large due to the inclination angle θ1 being too large, thereby causing local stress concentration in the connection part and the elastic ring, affecting the service life; furthermore, the inclination angles of the first inclined surface and the inner ring surface are within a reasonable range, ensuring that the magnitude of the first component force F1 is within an appropriate range, and the elastic ring is stably pressed against the iron core;

[0029] (3) Compared with the inner ring surface of the present invention which is inclined toward the side close to the axis, the outer ring surface is inclined toward the side away from the axis, which is opposite to the inclination direction of the inner ring surface. In this way, when the pressing member is gradually moved toward the direction close to the iron core to install the pressing member, the distance between the second inclined surface and the connecting portion gradually decreases, and the elastic ring is gradually compressed by the pressing portion, converting the axial movement of the pressing member into the radial contraction of the elastic ring, thereby ensuring that the elastic ring is set tightly against the iron core;

[0030] (4) The present invention makes the value range of the inclination angle θ2 be 5°≤θ2≤7°. With such a setting, on the one hand, as the pressing member moves, the elastic ring is gradually compressed by the pressing portion, thereby avoiding the situation where the compression degree of the elastic ring by the pressing portion is too small due to the inclination angle θ2 being too small, and then the elastic force of the elastic ring on the connecting portion is too small, affecting the magnitude of the reaction force Fn of the connecting portion on the elastic ring, and then affecting the abutment and limiting effect of the elastic ring on the iron core. On the other hand, it avoids the situation where the inclination degree of the outer ring surface and the second inclined surface is too large due to the inclination angle θ1 being too large, thereby causing local stress concentration on the pressing portion and the elastic ring, and affecting the service life. Furthermore, the inclination angles of the second inclined surface and the outer ring surface are within a reasonable range, ensuring that the elastic ring is stably pressed against the iron core.

[0031] (5) The present invention provides a ring portion and an elastic arm connected to one axial end of the ring portion, the elastic arm abuts against the iron core, the elastic arm has a certain length in the axial direction, and is extended in the direction close to the iron core, so that the side of the elastic arm away from the ring portion can effectively abut against the iron core, thereby ensuring the limiting effect of the elastic ring;

[0032] (6) The first end and the second end of the present invention can be close to or far away from each other. On the one hand, when the elastic ring is subjected to the force of the pressing member, a space for elastic deformation is provided for the elastic ring. On the other hand, the diameter of the ring portion is variable, and thus the elastic ring can be adapted to be installed in rotor structures of different specifications, with strong compatibility.

[0033] (7) The flange of the present invention is fixedly fastened to the support member. Compared with the elastic ring, the connecting part and the pressing member that flexibly limit the iron core, the flange and the pressing member abut to form a rigid limit, a double-angle and double-face limit, which improves the limiting effect of the iron core and is stable and reliable.

[0034] (8) The position limiting member of the present invention is radially protruding relative to the outer peripheral surface of the first base body, and the protruding portion abuts against the iron core to effectively limit the side of the iron core away from the elastic ring;

[0035] (9) The plurality of limiting members of the present invention are arranged around the circumference of the first base body and at intervals, so that the plurality of limiting members exert a comprehensive restraining effect on the iron core from different positions, thereby improving the limiting effect on the iron core and preventing the iron core from shifting during the operation of the motor;

[0036] (10) In the present invention, multiple elastic arms are arranged around the circumference of the ring portion and at intervals, so that the multiple elastic arms can exert a comprehensive restraining effect on the iron core from different positions, thereby improving the limiting effect on the iron core and preventing the iron core from shifting during the operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 is a schematic cross-sectional view of the motor rotor structure of the present invention;

[0039] Figure 2 For the present invention Figure 1 A magnified schematic diagram of point A in the middle;

[0040] Figure 3 For the present invention Figure 2 A magnified schematic diagram of point B in the middle;

[0041] Figure 4 Schematic diagram of the force acting on the elastic ring of the present invention;

[0042] Figure 5 is a schematic diagram of a support member of the present invention;

[0043] Figure 6 is a schematic diagram of an elastic ring of the present invention;

[0044] Figure 7 Schematic diagram of the explosion of the motor rotor structure of the present invention.

[0045] Description of reference numerals:

[0046] 1. Rotor; 11. Iron core; 12. Axis center line; 2. Support member; 21. First base; 22. Connecting portion; 221. First inclined surface; 222. Mounting hole; 23. Second base; 24. Third base; 25. Limiting member; 3. Elastic ring; 31. Inner annular surface; 32. Outer annular surface; 33. Ring portion; 34. Elastic arm; 35. Ring hole; 36. First end; 37. Second end; 4. Pressing member; 41. Main body; 42. Pressing portion; 421. Second inclined surface; 5. Flange; 6. Fastener. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0048] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0049] This embodiment proposes a motor rotor structure, such as Figures 1 to 7 As shown, it includes: a rotor 1, having an iron core 11, and the iron core 11 has an axis 12; a support member 2, having a first base 21 and a connecting portion 22 connected to each other, and the rotor 1 is sleeved on the first base 21; at least part of the outer wall of the connecting portion 22 is inclined toward the side close to the axis 12 along the direction close to the first base 21, forming a first inclined surface 221; an elastic ring 3, having a ring hole 35 passing through, and the elastic ring 3 forms an inner ring surface 31 around the ring hole 35, and the inner ring surface 31 is an inclined surface; the elastic ring 3 is sleeved on the connecting portion 22, and the inner ring surface 31 is arranged in contact with the first inclined surface 221; the elastic ring 3 has an outer ring surface 32 formed on the side away from the first inclined surface 221; a pressing member 4 is arranged to abut against at least the outer ring surface 32 of the elastic ring 3, and is suitable for making one end of the elastic ring 3 along the axial direction abut against the iron core 11.

[0050] It should be noted that the elastic ring 3 is made of elastic material, the pressing member 4 is a rigid structure; the first inclined surface 221 can be but not limited to a conical surface arranged around the axis 12; the axial and radial directions are Figure 1 The direction shown in the figure is perpendicular to the radial direction; the inner side of the rotor 1 is provided with an iron core 11; Figure 5 As shown, the connecting portion 22 can be, but is not limited to, arranged around the axis 12, the first base 21 is arranged around the axis 12, the connecting portion 22 is connected to at least one side of the first base 21 along the axial direction, the connecting portion 22 is recessed relative to the first base 21 in the radial direction, and is arranged in a stepped manner relative to the first base 21; the first inclined surface 221 can be, but is not limited to, formed on a portion of the outer peripheral wall of the connecting portion 22 close to the first base 21, and the remaining outer peripheral wall of the connecting portion 22 is arranged parallel to the axis 12.

[0051] Specific, combined Figure 4 The schematic diagram of the force of the elastic ring 3 shown in the figure shows that the inclination angle and direction of the inner ring surface 31 of the elastic ring 3 are consistent with the first inclined surface 221, so that when the elastic ring 3 is sleeved on the connecting portion 22, the inner ring surface 31 is arranged in contact with the first inclined surface 221; the pressing member 4 is arranged in contact with the outer ring surface 32 of the elastic ring 3, and the pressing member 4 applies a radial pressing force to the elastic ring 3, so that the elastic ring 3 is compressed in the radial direction, and the elastic ring 3 applies an elastic pressing force to the connecting portion 22, and then the connecting portion 22 applies a reaction force Fn perpendicular to the contact surface to the elastic ring 3. Since the contact surface between the elastic ring 3 and the connecting portion 22 is an inclined surface, the reaction force Fn is decomposed into a first component force F1 and a second component force F2. The first component force F1 makes the elastic ring 3 is displaced in a direction close to the iron core 11. If the iron core 11 has a length tolerance in the axial direction, the displacement of the elastic ring 3 compensates for the length tolerance, so that the elastic ring 3 is tightly against the iron core 11; the length tolerance of the iron core 11 caused by the superposition in the axial direction is supplemented by the displacement of the elastic ring 3, and no matter what the length tolerance of the iron core 11 in the axial direction is, the elastic ring 3 is displaced in a direction close to the iron core 11 through the cooperation between the pressing member 4, the elastic ring 3 and the inclined surface, so that the elastic ring 3 is displaced in a direction close to the iron core 11, so that the elastic ring 3 is tightly against the iron core 11, ensuring that the elastic ring 3 can be compatible with and compensate for the iron core 11 with any length tolerance. At the same time, with the help of the first component force F1, the elastic ring 3 is pressed against the iron core 11 to ensure an effective and good limiting effect on the iron core 11.

[0052] In this embodiment, a connecting portion 22 is provided at the support member 2, and a first inclined surface 221 is formed on at least a portion of the outer wall of the connecting portion 22. The inclination direction of the first inclined surface 221 is toward the direction close to the first base body 21, and is inclined toward the side close to the axial centerline 12, so that when the first inclined surface 221 cooperates with the inner ring surface 31 of the elastic ring 3, the reaction force Fn perpendicular to the contact surface applied by the connecting portion 22 to the elastic ring 3 can be effectively decomposed into a first component force F1 and a second component force F2. The decomposed first component force F1 causes the elastic ring 3 to displace toward the direction close to the iron core 11, and then the elastic ring 3 is pressed against the iron core 11. With the help of the displacement of the elastic ring 3, the length tolerance of the iron core 11 in the axial direction is effectively compensated. At the same time, with the help of the first component force F1, the elastic ring 3 is pressed against the iron core 11 to ensure an effective and good limiting effect on the iron core 11.

[0053] Optionally, the support member 2 also includes a second base 23 and a third base 24, the first base 21 is arranged around the second base 23, the third base 24 is arranged between the second base 23 and the first base 21, and the opposite sides of the third base 24 are respectively connected to the first base 21 and the second base 23; the second base 23 is arranged around the axis 12 for connection with other components of the rotor 1 structure such as a rotating shaft.

[0054] In some embodiments, combined Figure 2 As shown, in the cross section of the motor rotor structure along the axis 12 , the inclination angle of the first inclined surface 221 relative to the direction of the axis 12 is θ1, where 5°≤θ1≤7°.

[0055] It should be noted that the cross section of the motor rotor structure along the axis 12 is Figure 1 In the cross section shown, the first inclined surface 221 is a cone surface arranged around the axis 12 as a whole. The first inclined surface 221 forms an inclined line on the cross section, and the inclination angle θ1 is the angle between the inclined line and a straight line parallel to the axis 12.

[0056] It can be understood that the value range of the tilt angle θ1, 5°≤θ1≤7°, is only an embodiment of the present invention and is compatible with the motor rotor structure given in this embodiment; for other products with motor rotor structures different from those in this embodiment in actual applications, the value range of the tilt angle θ1 is determined according to the corresponding motor rotor structure.

[0057] Specifically, in this embodiment, the range of the inclination angle θ1 is 5°≤θ1≤7°. In this way, on the one hand, since the inclination direction and angle of the inner annular surface 31 are the same as those of the first inclined surface 221, it is avoided that the first component force F1 is too small due to the inclination angle θ1 being too small. Figure 4 From the force analysis diagram of the elastic ring 3 shown, it can be seen that F1 = Fn × cos (90° - θ1). When the value of (90° - θ1) is between 0 degrees and 90 degrees, the larger the angle (90° - θ1), the smaller the value of cos (90° - θ1). Therefore, if the inclination angle θ1 is too small, the first component force F1 will be too small, affecting the elastic ring 3's pressing and limiting effect on the iron core 11. On the other hand, it is avoided that the inclination degree of the inner ring surface 31 and the first inclined surface 221 is too large due to the inclination angle θ1 being too large, which causes local stress concentration on the connecting portion 22 and the elastic ring 3, affecting the service life. Furthermore, the inclination angles of the first inclined surface 221 and the inner ring surface 31 are within a reasonable range, ensuring that the magnitude of the first component force F1 is within an appropriate range, and the elastic ring 3 is stably pressed against the iron core 11.

[0058] In some embodiments, combined Figure 2As shown, the clamping member 4 includes a main body 41 and a clamping portion 42 connected to one end of the main body 41 along the axial direction, and the main body 41 is sleeved on the connecting portion 22; the outer ring surface 32 is inclined in the direction close to the iron core 11 and toward the side away from the axial centerline 12; the clamping portion 42 has a second inclined surface 421 on the side facing the connecting portion 22, and the inclination direction and angle of the second inclined surface 421 are the same as those of the outer ring surface 32; the clamping portion 42 abuts against the outer ring surface 32, and the second inclined surface 421 is fitted against the outer ring surface 32.

[0059] Specifically, the outer ring surface 32 can be, but is not limited to, a conical surface arranged around the axis 12; compared to the inner ring surface 31 inclined toward the side close to the axis 12, the outer ring surface 32 is inclined toward the side away from the axis 12, which is opposite to the inclination direction of the inner ring surface 31. With this arrangement, when installing the clamping member 4, the clamping member 4 is initially sleeved on the connecting portion 22, and the clamping portion 42 contacts the outer ring surface 32 of the elastic ring 3. Then, in the process of gradually moving the clamping member 4 toward the direction close to the iron core 11 to install the clamping member 4, the second inclined surface 421 slides relative to the inner ring surface 31 toward the direction close to the iron core 11. Since the second inclined surface 421 slides toward the axis 11 in the direction away from the iron core 11, 2 is arranged obliquely, so that in the direction away from the iron core 11, the distance between the second inclined surface 421 and the connecting portion 22 gradually decreases. Then, as the pressing member 4 moves, the elastic ring 3 is gradually compressed by the pressing portion 42, and the pressing portion 42 applies a radial force to the elastic ring 3. After the elastic ring 3 is compressed, the first inclined surface 221 cooperates with the inner ring surface 31 to make the elastic ring 3 press against the iron core 11. By providing the outer ring surface 32 and the second inclined surface 421, and at the same time, the outer ring surface 32 is inclined in the direction of approaching the iron core 11 and is inclined toward the side away from the axis 12. When the pressing member 4 is installed, the axial movement of the pressing member 4 is converted into radial contraction of the elastic ring 3, ensuring that the elastic ring 3 is set tightly against the iron core 11.

[0060] In some embodiments, combined Figure 3 As shown, in the cross section of the motor rotor structure along the axis 12 , the outer annular surface 32 has an inclination angle θ2 relative to the direction of the axis 12 , where 5°≤θ2≤7°.

[0061] It should be noted that the cross section of the motor rotor structure along the axis 12 is Figure 1 In the cross section shown, the outer annular surface 32 is a conical surface arranged around the axis 12 as a whole. The outer annular surface 32 forms an oblique line on the cross section, and the inclination angle θ2 is the angle between the oblique line and the straight line parallel to the axis 12.

[0062] It can be understood that the value range of the tilt angle θ2 5°≤θ2≤7° is only an embodiment of the present invention and is compatible with the motor rotor structure given in this embodiment; for other products with motor rotor structures different from those in this embodiment in actual applications, the value range of the tilt angle θ2 is determined according to the corresponding motor rotor structure.

[0063] Specifically, in the present embodiment, the value range of the inclination angle θ2 is 5°≤θ2≤7°. With such a setting, on the one hand, as the clamping member 4 moves, the elastic ring 3 is gradually compressed by the clamping portion 42, thereby avoiding that the compression degree of the elastic ring 3 by the clamping portion 42 is small due to the inclination angle θ2 being too small, and then the elastic force of the elastic ring 3 on the connecting portion 22 is small, affecting the magnitude of the reaction force Fn of the connecting portion 22 on the elastic ring 3, and then affecting the abutment and limiting effect of the elastic ring 3 on the iron core 11. On the other hand, it avoids that the inclination degree of the outer ring surface 32 and the second inclined surface 421 is too large due to the inclination angle θ1 being too large, thereby causing local stress concentration on the clamping portion 42 and the elastic ring 3, affecting the service life; furthermore, the inclination angles of the second inclined surface 421 and the outer ring surface 32 are within a reasonable range, ensuring that the elastic ring 3 is stably pressed against the iron core 11.

[0064] It can be understood that after the clamping part 42 is installed in place, that is, the elastic ring 3 is in contact with the iron core 11, the clamping part 42 and the elastic ring 3 are in interference fit, and the friction angle between the clamping part 42 and the elastic ring 3 is greater than the inclination angle θ2 of the first inclined surface 221, thereby forming self-locking between the clamping part 42 and the elastic ring 3.

[0065] In some embodiments, combined Figure 6 As shown, the elastic ring 3 includes a ring portion 33 and an elastic arm 34 connected to one axial end of the ring portion 33 . The ring portion 33 is sleeved on the connecting portion 22 , and the elastic arm 34 is disposed in contact with the iron core 11 .

[0066] Specifically, the first axial end 36 of the elastic arm 34 is connected to the ring portion 33, and the second axial end 37 of the elastic arm 34 is arranged to abut the iron core 11; in the radial direction, the elastic arm 34 is relatively located above the first base 21 and abuts the iron core 11; the elastic arm 34 has a certain length in the axial direction and is extended in the direction close to the iron core 11, so that the side of the elastic arm 34 away from the ring portion 33 can effectively abut the iron core 11, thereby ensuring the limiting effect of the elastic ring 3.

[0067] In some embodiments, combined Figure 6 As shown, at least a portion of the ring portion 33 is disconnected, and a first end 36 and a second end 37 are formed at the disconnected position, and the first end 36 and the second end 37 are spaced apart.

[0068] Specifically, the ring portion 33 is disconnected at at least part of the continuously arranged ring body, and the ring body at the disconnected position forms a first end 36 and a second end 37, and the first end 36 and the second end 37 are spaced apart, so that the first end 36 and the second end 37 can be close to or away from each other. On the one hand, when the elastic ring 3 is subjected to the force of the clamping member 4, space is provided for the elastic ring 3 to elastically deform. On the other hand, the diameter of the ring portion 33 is variable, so that the elastic ring 3 can be adapted to be installed in rotor 1 structures of different specifications, and has strong compatibility.

[0069] In some embodiments, combined Figure 1 As shown, the motor rotor structure further includes a flange 5 , which is fixed to one end of the connecting portion 22 away from the first base 21 , and a side of the body 41 away from the pressing portion 42 abuts against the flange 5 .

[0070] Specifically, a mounting hole 222 is provided at the end of the connecting portion 22 away from the first base 21, and the mounting hole 222 is extended in the axial direction. The flange 5 is fixed to the end side of the connecting portion 22 by means of a fastener 6. The fastener 6 can be a bolt. The fastener 6 passes through the flange 5 and is fixed in the mounting hole 222, so that the flange 5 is fixed to the connecting portion 22; wherein, in the radial direction, at least part of the plate body of the flange 5 extends beyond the connecting portion 22, so that the side of the flange 5 close to the iron core 11 abuts against the clamping portion 42. Since the flange 5 is fastened to the support member 2, compared with the elastic ring 3, the connecting portion 22 and the clamping member 4 for flexibly limiting the iron core 11, the flange 5 abuts against the clamping member 4 to form a rigid limitation, a double-angle and double-face limitation, which improves the limiting effect on the iron core 11 and is stable and reliable.

[0071] In some embodiments, combined Figure 5 As shown, the support member 2 further includes a limiting member 25 , which is connected to the first base 21 and abuts against the end of the iron core 11 away from the elastic ring 3 .

[0072] Specifically, in the radial direction, the limiting member 25 is protruding relative to the outer peripheral surface of the first base 21, and the protruding part abuts against the iron core 11 to effectively limit the side of the iron core 11 away from the elastic ring 3; it can be understood that the limiting structure composed of the connecting part 22, the elastic ring 3, the clamping member 4 and the flange 5 is arranged on one side of the iron core 11 along the axial direction, and the limiting member 25 can be set on the other side, or the limiting structure provided by this embodiment is set on both opposite sides of the iron core 11 along the axial direction.

[0073] In some embodiments, combined Figure 5 As shown, a plurality of limiting members 25 are provided, and the plurality of limiting members 25 are arranged around the circumference of the first base body 21 and at intervals.

[0074] Specifically, the iron core 11 is arranged around the axis 12, and then a plurality of limiting members 25 are arranged. The plurality of limiting members 25 are arranged around the circumference of the first base 21 and at intervals, so that the plurality of limiting members 25 exert a comprehensive restraining effect on the iron core 11 from different positions, thereby improving the limiting effect on the iron core 11 and preventing the iron core 11 from being offset during the operation of the motor.

[0075] In some embodiments, combined Figure 6 As shown, a plurality of elastic arms 34 are provided, and the plurality of elastic arms 34 are arranged around the circumference of the ring portion 33 and at intervals.

[0076] Specifically, the iron core 11 is arranged around the axis 12, and then a plurality of elastic arms 34 are provided. The plurality of elastic arms 34 are arranged around the circumference of the ring portion 33 and at intervals, so that the plurality of elastic arms 34 exert a comprehensive restraining effect on the iron core 11 from different positions, thereby improving the limiting effect on the iron core 11 and preventing the iron core 11 from being offset during the operation of the motor.

[0077] The assembly process of the motor rotor structure provided in this embodiment is as follows: first, the support member 2 and the rotor 1 are assembled together, wherein the limit member 25 at the support member 2 abuts against the side of the iron core 11 away from the connecting portion 22; then the elastic ring 3 is clamped into the connecting portion 22, and the inner ring surface 31 of the elastic ring 3 is in contact with the first inclined surface 221, and then the clamping member 4 is preliminarily sleeved on the connecting portion 22, and the clamping portion 42 is in contact with the outer ring surface 32 of the elastic ring 3, and then the clamping member 4 is gradually moved toward the direction close to the iron core 11 to install the clamping member 4, at this time, the second inclined surface 421 slides relative to the inner ring surface 31 toward the direction close to the iron core 11, and the elastic ring 3 is gradually compressed by the clamping portion 42, and the elastic ring 3 applies an elastic clamping force to the connecting portion 22, Then the connecting portion 22 applies a reaction force Fn perpendicular to the contact surface to the elastic ring 3. Since the contact surface between the elastic ring 3 and the connecting portion 22 is an inclined surface, the reaction force Fn is decomposed into a first component F1 and a second component F2. The first component F1 causes the elastic ring 3 to displace toward the direction close to the iron core 11. If the iron core 11 has a length tolerance in the axial direction, the displacement of the elastic ring 3 compensates for the length tolerance, so that the elastic ring 3 is pressed against the iron core 11, thereby achieving the effect of effectively limiting and fixing the iron core 11; thereafter, the flange 5 is fixed to the end of the connecting portion 22 away from the iron core 11, and abuts against the clamping piece 4 to limit the position of the clamping piece 4, forming a rigid limit, a double-angle and double-face limit, to ensure a reliable and stable limiting effect on the iron core 11.

[0078] Optionally, the assembly process of the support member 2 and the rotor 1 may be, but is not limited to, a shrink fit process. The shrink fit process is a process method in mechanical assembly in which a part is heated to expand and then interference fit is made with a part at room temperature.

[0079] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A motor rotor structure, characterized in that: include: A rotor (1) having an iron core (11), wherein the iron core (11) has an axial centerline (12); The support member (2) comprises a first base (21) and a connecting portion (22) which are connected to each other, and the rotor (1) is sleeved on the first base (21); at least a portion of the outer wall of the connecting portion (22) is inclined toward a side close to the axis (12) in a direction close to the first base (21), forming a first inclined surface (221); The elastic ring (3) is provided with a ring hole (35) extending therethrough, and the elastic ring (3) is provided with an inner ring surface (31) surrounding the ring hole (35), and the inner ring surface (31) is an inclined surface; the elastic ring (3) is sleeved on the connecting portion (22), and the inner ring surface (31) is arranged in contact with the first inclined surface (221); An outer ring surface (32) is formed on the side of the elastic ring (3) facing away from the first inclined surface (221); The pressing member (4) is arranged to abut against at least the outer ring surface (32) of the elastic ring (3), and is suitable for making one end of the elastic ring (3) along the axial direction abut against the iron core (11).

2. The motor rotor structure according to claim 1, characterized in that: On a cross section of the motor rotor structure along the axis (12), the first inclined surface (221) has an inclination angle of θ1 relative to the direction of the axis (12), wherein 5°≤θ1≤7°.

3. The motor rotor structure according to claim 1, characterized in that: The pressing member (4) comprises a main body (41) and a pressing portion (42) connected to one end of the main body (41) along the axial direction, and the main body (41) is sleeved on the connecting portion (22); The outer annular surface (32) is inclined in a direction close to the iron core (11) and away from the axis (12); The pressing portion (42) has a second inclined surface (421) on one side facing the connecting portion (22), and the inclination direction and angle of the second inclined surface (421) are the same as those of the outer annular surface (32); The pressing portion (42) abuts against the outer annular surface (32), and the second inclined surface (421) is arranged in close contact with the outer annular surface (32).

4. The motor rotor structure according to claim 3, characterized in that: On a cross section of the motor rotor structure along the axis (12), the outer annular surface (32) has an inclination angle of θ2 relative to the direction of the axis (12), wherein 5°≤θ2≤7°.

5. The motor rotor structure according to any one of claims 1 to 4, characterized in that: The elastic ring (3) comprises a ring portion (33) and an elastic arm (34) connected to one axial end of the ring portion (33); the ring portion (33) is sleeved on the connecting portion (22); and the elastic arm (34) is arranged in contact with the iron core (11).

6. The motor rotor structure according to claim 5, characterized in that: At least part of the ring body of the ring portion (33) is disconnected, and a first end (36) and a second end (37) are formed at the disconnected position, and the first end (36) and the second end (37) are spaced apart.

7. The motor rotor structure according to claim 3, characterized in that: The motor rotor structure further comprises a flange (5), the flange (5) being fixed to an end of the connecting portion (22) away from the first base (21), and the side of the body (41) facing away from the pressing portion (42) being in contact with the flange (5).

8. The motor rotor structure according to claim 7, characterized in that: The support member (2) further comprises a limiting member (25), wherein the limiting member (25) is connected to the first base body (21) and is abutted against an end of the iron core (11) away from the elastic ring (3).

9. The motor rotor structure according to claim 8, characterized in that: A plurality of the limiting members (25) are provided, and the plurality of limiting members (25) are arranged around the circumference of the first base body (21) and at intervals.

10. The motor rotor structure according to claim 6, characterized in that: A plurality of elastic arms (34) are provided, and the plurality of elastic arms (34) are circumferentially arranged along the ring portion (33) and spaced apart.

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