Bearing assembly and motor

Abstract

The present invention discloses a bearing assembly and a motor, belonging to the technical field of bearings. The motor includes a housing, and bearing assemblies are respectively arranged on both sides of the housing. The bearing assembly includes a bearing chamber cover and an external rotating curved surface bearing. A bearing chamber is arranged in the center of the bearing chamber cover, characterized in that the bearing chamber wall is a rotating curved surface groove that is recessed radially outward along the bearing, which is generated by the first part of the arc of a circle with a radius of R1 rotating around the axis of the bearing on the plane where it is located, so as to be matched with the external rotating curved surface bearing clearance, and the connecting line of the two end points of the first part of the arc is parallel to the axis of the bearing. The present invention solves the imbalance caused by the position deviation of the bearing installation of the motion support when the motor equipped with a rotor rotates. The present invention makes the motor air gap uniform, the output power stable, reduces mechanical vibration and noise, reduces energy consumption, and can increase the load.

Description

Technical Field

[0001] The invention relates to a bearing assembly and a motor, belonging to the technical field of bearings. Background Art

[0002] With the rapid development of motors in new energy sources, their function of converting electrical energy into mechanical power is obvious. In particular, high-speed motors have the advantages of high efficiency, low noise, and fast dynamic response. In high-speed rotation, there are certain requirements for their volume, lubrication, motion support components, and heat dissipation. The motor motion support components are bearings installed in the bearing chambers obtained by machining on the end covers at both ends of the motor housing. The matching state of the bearing chambers and bearings on the end covers at both ends helps to improve the working conditions of the motor during rotation.

[0003] The existing motor transmission support components are all composed of a bearing with a cylindrical inner diameter and an outer diameter and an end cover with a bearing chamber obtained by machining. Since the left and right bearing chambers are not the same structure and are machined in stages, the bearing chamber has errors due to precision. The cylindrical bearing is assembled in the bearing chamber of the end cover and inevitably has substandard matching deviations, excessive coaxiality, and unbalanced motor rotation. The abnormal change of the bearing movement clearance increases the torque of the motor during rotation, the air gap is uneven, and the motor output power is unstable, mechanical vibration, large noise and uneven fluctuations, and high energy consumption. The lubrication system of the existing motor motion support components: one is to add a cover body on each side of the bearing chamber to place the cylindrical bearing in the middle, and grease is injected from the cover body hole outside to supplement lubrication. This structure is complicated and grease is easy to leak from the cover body gap on the left and right sides of the bearing chamber. The other is that the cylindrical bearing self-guided seal ring seals the grease in the bearing sealing chamber, but this structure cannot supplement lubrication. Due to the imperfect structural design, the lubricating grease is not fully replenished in time, and the motor transmission support is frequently maintained.

[0004] Therefore, the existing motor transmission support components have problems such as large deviation in the mechanical fit tolerance between the rotor output core shaft and the bearing in the bearing chamber, high dynamic balance of the motor and uneven air gap; the lubrication system of the existing motor motion support components does not achieve the expected life effect of the motor due to imperfect structural design, so we propose a motor with a rotating curved bearing assembly as the transmission support. Summary of the invention

[0005] The purpose of the present invention is to provide a bearing assembly and a motor, which can effectively solve the technical problems of large deviation in mechanical matching tolerance between the output core shaft of the rotor and the bearing chamber of the motor transmission support component, high dynamic balance of the motor and uneven air gap.

[0006] To achieve the above-mentioned purpose, the present invention provides a bearing assembly, which includes a bearing chamber cover and an external rotating curved surface bearing, wherein a bearing chamber is arranged at the center of the bearing chamber cover, and the bearing chamber wall is a rotating curved surface groove which is recessed radially outward along the bearing and formed by a first part of the arc of a circle with a radius of R1 rotating around the axis of the bearing on the plane where it is located, so as to be loosely matched with the external rotating curved surface bearing, and the line connecting the two end points of the first part of the arc is parallel to the axis of the bearing; the external rotating curved surface bearing includes an outer ring, an inner ring arranged inside the outer ring, and a rolling body arranged in a circular ring cavity formed between the inner ring and the outer ring, and the outer wall of the outer ring is a rotating curved surface which is protruded radially outward along the bearing and formed by a second part of the arc of a circle with a radius of R2 rotating around the axis of the bearing on the plane where it is located, and the line connecting the two end points of the second part of the arc is parallel to the axis of the bearing, and R2 is slightly smaller than R1; the outer ring is provided with an oil channel; the bearing chamber cover is provided with an oil filling cup, and the oil filling cup is connected with the oil channel of the outer ring of the external rotating curved surface bearing.

[0007] Preferably, the outer wall of the inner ring is a rotating curved groove that is recessed radially inward along the bearing, formed by a third partial arc line with a radius R3 of the rolling body rotating around the axis of the bearing on the plane where it is located, and the line connecting the two end points of the third partial arc line is parallel to the axis of the bearing.

[0008] Preferably, the inner wall of the outer ring is a rotating curved groove that is recessed radially outward along the bearing and is formed by a fourth partial arc line with a radius of R3 rotating around the axis of the bearing on the plane where it is located. The line connecting the two end points of the fourth partial arc line is parallel to the axis of the bearing, and the fourth partial arc line and the third partial arc line are symmetrical in image.

[0009] Preferably, the external rotating curved surface bearing also includes a first annular sealing ring and a second annular sealing ring, wherein the first annular sealing ring seals the first surface of the outer ring and the inner ring perpendicular to the axis of the bearing, and the second annular sealing ring seals the second surface of the outer ring and the inner ring perpendicular to the axis of the bearing, thereby sealing the rolling body in an annular closed cavity formed by the outer ring, the inner ring, the first annular sealing ring and the second annular sealing ring.

[0010] Preferably, the outer ring is further provided with an oil hole connected to the annular cavity for encapsulating the rolling body, and the oil channel is connected to the oil hole.

[0011] To achieve the above-mentioned purpose, the present invention further provides a motor, which includes a casing, and the above-mentioned bearing assemblies are respectively arranged on both sides of the casing.

[0012] Preferably, an armature winding is arranged on the stator, a rotor is arranged in a cavity formed in the center of the stator, the rotor is arranged on the output core shaft, and external rotating curved surface bearings are respectively arranged at both ends of the output core shaft.

[0013] Preferably, when the outer curved surface bearing is installed on the left side of the output core shaft, the oil channel is arranged on the left side of the outer ring; when the outer curved surface bearing is installed on the right side of the output core shaft, the oil channel is arranged on the right side of the outer ring.

[0014] The present invention has the following beneficial effects:

[0015] 1. The present invention designs the bearing chamber in the bearing chamber cover as a rotating curved surface, thereby forming a curved surface match with the external rotating curved surface bearing, which has the functions of self-aligning and self-aligning coaxiality. Guided by the output core shaft, the motor air gap is ensured to be uniform, the output power is stable, the mechanical vibration and noise are reduced, and energy saving and consumption reduction are achieved.

[0016] 2. The present invention integrates the rotating curved surface bearing with the motor end cover, thereby saving processing and installation, increasing rigidity, avoiding cumulative errors, simplifying the structure, and reducing manufacturing costs.

[0017] 3. The present invention arranges an oil filling cup on the bearing chamber cover and an oil channel and a through hole on the outer ring, so that the lubricating grease can reach the rolling elements in the annular closed cavity of the rotating curved surface bearing from the oil filling cup through the oil channel, thereby saving the amount of grease used and avoiding the beneficial effect of waste grease polluting the environment when the bearing is replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural diagram of the motor provided by the present invention;

[0019] Figure 2 A 90° cross-sectional view of the motor provided by the present invention;

[0020] Figure 3 An exploded schematic diagram of the motor provided by the present invention;

[0021] Figure 4 A 90° cross-sectional view of the left bearing assembly provided by the present invention;

[0022] Figure 5 A partial enlarged view of a 90° cross-sectional view of the left bearing assembly provided by the present invention;

[0023] Figure 6 A 90° cross-sectional view of the right bearing assembly provided by the present invention;

[0024] Figure 7 It is a partial enlarged view of a 90° cross-sectional view of the right bearing assembly provided by the present invention.

[0025] In the drawings, the components represented by the reference numerals are listed as follows:

[0026] 1: housing, 2: left bearing assembly, 3: output mandrel, 4: long screw, 5: motor support foot; 6: terminal box; 7: fan cover, 8: fan blade; 9: right bearing assembly, 10: rotor, 11: stator, 201: left bearing chamber cover, 2011A: left mounting hole A, 2011B: left mounting hole B, 2011C: left mounting hole C, 2012: left port step, 2013: left rotating curved surface channel, 2014: left oil channel, 202: left outer rotating curved surface bearing, 2020: left rolling element, 2021: left outer ring, 2022: left inner ring, 2023A: left annular seal Ring A, 2023B: left annular sealing ring B, 2024: left oil hole, 203: left oil filling cup, 901: right bearing chamber cover, 9011A: right mounting hole A, 9011B: right mounting hole B, 9011C: right mounting hole C, 9012: right port step, 9013: right rotating curved surface groove, 9014: right oil channel, 902: right external rotating curved surface bearing, 9020: right rolling element, 9021: right outer ring, 9022: right inner ring, 9023A: right annular sealing ring A, 9023B: right annular sealing ring B, 9024: right oil hole, 903: right oil filling cup. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Figure 1 A three-dimensional structural diagram of the motor provided by the present invention, Figure 2 A 90° cross-sectional view of the motor provided by the present invention, Figure 3 The exploded schematic diagram of the motor provided by the present invention is as follows: Figure 1-3 As shown, the motor provided by the present invention includes a casing 1, a left bearing assembly 2 and a right bearing assembly 9 are respectively arranged on both sides of the casing 1, the mounting hole of the left bearing chamber cover of the left bearing assembly 2 is fixed to the blind hole at the left end of the casing by multiple long screws 4, and the mounting hole of the right bearing chamber cover of the right bearing assembly 9 is fixed to the blind hole at the right end of the casing by multiple long screws; a stator 11 is arranged in the center of the internal cavity of the casing 1, an armature winding is arranged on the stator, a rotor 10 is arranged in the cavity formed in the center of the stator 11, the rotor 10 is arranged on the output mandrel 3, and the left bearing assembly 2 and the right bearing assembly 9 are respectively arranged at both ends of the output mandrel 3. A fan blade 8 is also arranged on the output mandrel outside the right bearing assembly 9, and a wind shield 7 is arranged on the outer periphery of the fan blade 8, and the wind shield 7 is connected to the casing 1 so that their interiors form a receiving cavity together. A motor support foot 5 is arranged at the lower part of the casing 1, and a terminal box 6 is arranged on the side.

[0029] Figure 4 A 90° cross-sectional view of the left bearing assembly provided by the present invention; Figure 5 A partial enlarged view of a 90° cross-sectional view of the left bearing assembly provided by the present invention; Figure 4-5 As shown, the left bearing assembly 2 includes: a left bearing chamber cover 201 and a left outer rotating curved bearing 202 arranged in the bearing chamber in the center of the left bearing chamber cover. A bearing chamber is arranged in the center of the left bearing chamber cover 201. The bearing chamber wall is a rotating curved groove that is recessed radially outward along the bearing, formed by the first part of the arc of a circle with a radius R1 rotating around the axis of the bearing on the plane where it is located. The line connecting the two end points of the first part of the arc is parallel to the axis; the rotating curved groove is clearance-matched with the outer rotating curved bearing, and the rotating curved surface is preferably a spherical surface, which can have the micro-sliding movement and angle adjustment of the joint ball function after being subjected to force. The left outer rotating curved surface bearing 202 comprises a left outer ring 2021, a left inner ring 2022 arranged inside the left outer ring 2021, and a plurality of left rolling bodies 2020 arranged in a circular ring cavity formed between the left outer ring 2021 and the outside of the left inner ring 2022. The outer wall of the left outer ring 2021 is a rotating curved surface protruding outward along the radial direction of the bearing formed by the second part of the arc of a circle with a radius of R2 rotating around the axis of the bearing on the plane where it is located, and the line connecting the two ends of the second part of the arc is parallel to the axis, and R2 is slightly smaller than R1. The outer wall of the left inner ring 2022 is a left rotating curved surface groove concave inward along the radial direction of the bearing formed by the third part of the arc of a circle with a radius of R3 of the left rolling body 2020 rotating around the axis of the bearing on the plane where it is located, and the line connecting the two ends of the third part of the arc is parallel to the axis. The rolling body of the present invention is preferably spherical, but can also be cylindrical, conical, rotating curved surface, etc.

[0030] In the present invention, the inner wall of the left outer ring 2021 is a left-rotating curved groove 2013 that is recessed radially outward along the bearing and is formed by the fourth partial arc of the circle with a radius of R3 rotating around the axis of the bearing on the plane where it is located. The line connecting the two end points of the fourth partial arc is parallel to the axis, and the fourth partial arc and the third partial arc are symmetrical in image.

[0031] In the present invention, the left outer rotating curved surface bearing also includes a left annular sealing ring B2023B and a left annular sealing ring A2023A, wherein the left annular sealing ring B2023B seals the first surface of the left outer ring and the left inner ring perpendicular to the axis of the bearing, and the left annular sealing ring A2023A seals the second surface of the left outer ring and the left inner ring perpendicular to the axis of the bearing, thereby sealing the left rolling element 2020 in the annular closed cavity formed by the left outer ring 2021, the left inner ring 2022, the left annular sealing ring B2023B and the left annular sealing ring A2023A.

[0032] In the present invention, the left outer ring 2021 is provided with a left oil passage 2014 and a left oil hole 2024 communicating with the annular cavity for the left packaged rolling element, and the left oil passage is communicated with the left oil hole. The left bearing chamber cover is provided with a left oil filling cup 203 on the left side, and the left oil filling cup 203 is communicated with the left oil passage of the outer ring of the left outer rotating curved surface bearing arranged on the left side of the output core shaft. The left oil filling cup 203 is arranged on the left bearing chamber cover in an embedded manner.

[0033] In the present invention, the left outer rotating curved surface bearing is installed on the left side of the output core shaft, and the left oil channel is arranged on the left side of the left outer ring.

[0034] The left bearing chamber cover 2 is provided with left mounting holes A2011A, left mounting holes B2011B and left mounting holes C2011C at equal intervals for fixing with the housing through long screws. The left bearing chamber cover 2 is provided with a left port step 2012 for auxiliary positioning and guiding.

[0035] Figure 6 A 90° cross-sectional view of the right bearing assembly provided by the present invention; Figure 7 This is a partial enlarged view of a 90° cross-sectional view of the right bearing assembly provided by the present invention. Figure 6-7 As shown, the right bearing assembly includes a right bearing chamber cover 901 and a right outer rotating curved bearing 902 arranged in the bearing chamber in the center of the right bearing chamber cover. A bearing chamber is arranged in the center of the right bearing chamber cover 901. The bearing chamber wall is a rotating curved groove that is recessed radially outward along the bearing, formed by the first part of the arc of a circle with a radius R1 rotating around the axis of the bearing on the plane where it is located. The line connecting the two vertices of the first part of the arc is parallel to the axis. The rotating curved groove is clearance-matched with the right outer rotating curved bearing. In the present invention, the rotating curved surface is preferably a spherical surface, which can have the micro-sliding motion and angle adjustment of the joint ball function after being subjected to force. The right outer rotating curved surface bearing 902 comprises a right outer ring 9021, a right inner ring 9022 arranged inside the right outer ring 9021, and a plurality of right rolling bodies 9020 arranged in a circular ring cavity formed between the right outer ring 9021 and the outside of the right inner ring 9022. The outer wall of the right outer ring 9021 is a rotating curved surface protruding outward along the radial direction of the bearing formed by the second part of the arc of a circle with a radius of R2 rotating around the axis of the bearing on the plane where it is located, and the line connecting the two end points of the second part of the arc is parallel to the axis, and R2 is slightly smaller than R1. The outer wall of the right inner ring 9022 is a rotating curved surface groove concave inward along the radial direction of the bearing formed by the third part of the arc of a circle with a radius of R3 of the right rolling body 9020 rotating around the axis of the bearing on the plane where it is located, and the line connecting the two end points of the third part of the arc is parallel to the axis. The rolling body of the present invention is preferably spherical, but can also be cylindrical, conical, rotating curved surface, etc.

[0036] In the present invention, the inner wall of the right outer ring 9021 is a right-handed rotating curved groove 9013 that is recessed radially outward along the bearing and is formed by the fourth partial arc of a circle with a radius of R3 rotating around the axis of the bearing on the plane where it is located. The line connecting the two end points of the fourth partial arc is parallel to the axis, and the fourth partial arc and the third partial arc are symmetrical in image.

[0037] In the present invention, the right external rotating curved surface bearing also includes a right annular sealing ring B9023B and a right annular sealing ring A9023A, wherein the right annular sealing ring B9023B seals the first surface of the right outer ring and the right inner ring perpendicular to the axis of the bearing, and the right annular sealing ring A9023A seals the second surface of the right outer ring and the right inner ring perpendicular to the axis of the bearing, thereby sealing the right rolling element 9020 in the annular closed cavity formed by the right outer ring 9021, the right inner ring 9022, the right annular sealing ring B9023B and the right annular sealing ring A9023A.

[0038] In the present invention, the right outer ring 9021 is provided with a right oil passage 9014 and a right oil hole 9024 communicating with the annular cavity, and the right oil passage is communicated with the right oil hole. The right bearing chamber cover is provided with a right oil filling cup 903 on the right side, and the right oil filling cup 903 is communicated with the right oil passage of the right outer ring of the outer rotating curved surface bearing arranged on the right side of the output core shaft. The right oil filling cup 903 is arranged on the right bearing chamber cover in an embedded manner.

[0039] The right bearing chamber cover 9 is provided with right mounting holes A9011A, right mounting holes B9011B and right mounting holes C9011C at equal intervals for fixing to the casing through long screws.

[0040] The present invention uses a structure in which the rotating curved surface groove of the bearing chamber is recessed outward along the radial direction of the bearing and the clearance of the outer rotating curved surface bearing is matched. The tensile strength and yield strength of the output mandrel can be used to adjust the arbitrary rotation angle in a small range, so as to achieve the effect of aligning the position and angle of the inner hole of the bearing; the rotor 10 carried by the output mandrel 3 is used for free guiding to align in the middle of the stator 11, so that the air gap of the motor is uniform, the output power of the motor is stable, the mechanical vibration of the motor is reduced, and the energy consumption is reduced. After the test after installation, the temperature rise and noise of the motor are significantly reduced.

[0041] The present invention arranges an oil filling cup outside the bearing chamber cover, and arranges an oil channel and an oil hole on the outer ring of the bearing, so that the lubricating grease enters the oil hole arranged on the bearing through the oil filling cup and the oil channel, and then flows into the rolling element of the annular cavity formed by the outer ring and the inner ring, so that the bearing is fully lubricated, cooled and friction and wear are reduced during operation, thereby ensuring the bearing accuracy and service life. It avoids disassembly and environmental pollution during bearing maintenance, reduces industrial cost consumption, and facilitates motor maintenance.

[0042] The present invention forms an annular accommodating cavity by arranging a rotating curved surface groove which is concave in the radial direction of the bearing outward in the outer ring of the bearing and a rotating curved surface groove which is concave in the radial direction of the bearing inward outside the inner ring of the bearing, wherein a rolling body is arranged in the accommodating cavity, and sealing rings are respectively arranged on both sides between the outer ring and the inner ring so as to store lubricating grease, prevent external foreign matter from entering, prevent grease leakage from polluting the environment, control temperature, and reduce bearing noise.

[0043] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bearing assembly, comprising a bearing chamber cover and an external rotating curved surface bearing, wherein a bearing chamber is arranged at the center of the bearing chamber cover, characterized in that: The bearing chamber wall is a radially outwardly recessed rotating curved groove formed by the first part of the arc of a circle with a radius of R1 rotating around the axis of the bearing on the plane where it is located, so as to be loosely matched with the external rotating curved bearing, and the line connecting the two end points of the first part of the arc is parallel to the axis of the bearing; the external rotating curved bearing comprises an outer ring, an inner ring arranged inside the outer ring, and a rolling body arranged in a circular ring cavity formed between the inner ring and the outer ring, the outer wall of the outer ring is a radially outwardly protruding rotating curved surface formed by the second part of the arc of a circle with a radius of R2 rotating around the axis of the bearing on the plane where it is located, the line connecting the two end points of the second part of the arc is parallel to the axis of the bearing, and R2 is slightly smaller than R1; the outer ring is provided with an oil channel; the bearing chamber cover is provided with an oil filling cup, and the oil filling cup is connected with the oil channel of the outer ring of the external rotating curved bearing; The external rotating curved surface bearing also includes a first annular sealing ring and a second annular sealing ring. The first annular sealing ring seals the first surface of the outer ring and the inner ring perpendicular to the axis of the bearing, and the second annular sealing ring seals the second surface of the outer ring and the inner ring perpendicular to the axis of the bearing, so that the rolling body is sealed in an annular closed cavity formed by the outer ring, the inner ring, the first annular sealing ring and the second annular sealing ring. The outer ring is also provided with an oil hole connected to the circular ring cavity encapsulating the rolling body, and the oil channel is connected to the oil hole.

2. The bearing assembly according to claim 1, characterized in that: The outer wall of the inner ring is a rotating curved groove that is recessed radially inward along the bearing when the third part arc line with a radius R3 of the rolling body rotates around the axis of the bearing on the plane where it is located. The line connecting the two end points of the third part arc line is parallel to the axis of the bearing.

3. The bearing assembly according to claim 2, characterized in that: The inner wall of the outer ring is a rotating curved groove that is concave outward along the radial direction of the bearing and is formed by the fourth partial arc line of a circle with a radius of R3 rotating around the axis of the bearing on the plane where it is located. The line connecting the two end points of the fourth partial arc line is parallel to the axis of the bearing, and the fourth partial arc line and the third partial arc line are symmetrical in image.

4. A motor, comprising a housing, characterized in that: The bearing assembly according to any one of claims 1 to 3 is respectively arranged on both sides of the housing.

5. The motor according to claim 4, characterized in that A stator is arranged in the center of the casing, an armature winding is arranged on the stator, a rotor is arranged in a cavity formed in the center of the stator, the rotor is arranged on an output core shaft, and external rotating curved surface bearings are respectively arranged at both ends of the output core shaft.

6. The motor according to claim 5, characterized in that When the external rotating curved surface bearing is installed on the left side of the output core shaft, the oil channel is arranged on the left side of the outer ring; when the external curved surface bearing is installed on the right side of the output core shaft, the oil channel is arranged on the right side of the outer ring.

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