Motor bearing seat and motor

Abstract

The utility model provides a motor bearing seat and a motor, which belongs to the technical field of motor equipment and comprises a bearing seat body and a damping sleeve. The bearing seat body is arranged in the end cover, a plurality of connecting parts are arranged on the periphery of the bearing seat body, a bearing steel sleeve is embedded in the inner wall of the bearing seat body in the circumferential direction, the bearing steel sleeve is arranged on the periphery of the bearing seat body in a surrounding mode, and the bearing seat body is made of insulating materials; the periphery of the bearing seat body is sleeved with the vibration reduction sleeve. According to the motor bearing seat provided by the utility model, the bearing seat body is made of the insulating material, has the characteristic of insulation, can isolate current which breaks down an oil film, prevents the breakdown current from directly acting on a steel ball or a raceway to generate electrocorrosion traces, and prevents the problems of bearing failure and motor fault caused by metal stripping. The vibration reduction sleeve can buffer vibration and impact borne by the whole machine or impact generated during operation of the bearing body, the vibration and the impact cannot be directly transmitted to the end cover through the bearing seat body, working noise is reduced, and normal operation of an automobile is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor equipment, and more specifically, relates to a motor bearing seat and a motor. Background Art

[0002] With the rapid development of the new energy vehicle market, the market demand for drive motors is also increasing. Currently, the main type of motors used in new energy vehicles are permanent magnet synchronous motors.

[0003] The passage of current in the bearings of permanent magnet synchronous motors is a necessary condition for the occurrence of electrical corrosion in the bearings. There are two main sources of shaft current in the motor:

[0004] a. Capacitive bearing current: the capacitive induced voltage caused by the pulse width switching waveform generated by the controller is coupled to the motor shaft through parasitic capacitance, which can discharge in the motor bearing or the bearing or gear of the connected installation equipment to form electrical discharge machining;

[0005] b. High-frequency loop current: High-frequency loop current is caused by high-frequency magnetic flux generated by common-mode current. The frequency of high-frequency induction circulating current from the controller is in the range of several kilohertz or several megahertz. Generally speaking, the larger the motor, the greater the impact of high-frequency loop current.

[0006] Permanent magnet synchronous motors have high torque density, high efficiency and good reliability. However, the shaft current caused by motor flux asymmetry and controller common mode voltage can cause the oil film of the bearing to be broken down. This repeated breakdown phenomenon will cause electrical corrosion marks on the steel balls or raceways of the bearings. In severe cases, metal peeling will occur, resulting in bearing failure and motor failure. In addition, vibration will increase the working noise of the motor, causing customer complaints and affecting the normal operation of the car. Utility Model Content

[0007] The purpose of the utility model is to provide a motor bearing seat, aiming to solve the problem that repeated breakdown of current will cause electrical corrosion marks on the steel balls or raceways of the bearings, and in severe cases, metal peeling will occur, resulting in bearing failure and motor failure. In addition, vibration will cause the working noise of the motor to increase, affecting the normal operation of the car.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a motor bearing seat, comprising:

[0009] A bearing seat body, the bearing seat body is arranged in the end cover, the outer periphery of the bearing seat body is provided with a plurality of connection parts for connecting the inner end surface of the end cover, the inner wall of the bearing seat body is circumferentially embedded with a bearing steel sleeve, the bearing steel sleeve is arranged around the outer periphery of the bearing body, and the bearing seat body is made of insulating material for isolating breakdown current;

[0010] A vibration-damping sleeve is arranged on the outer periphery of the bearing seat body, and is used to buffer the vibration of the bearing seat body from being transmitted to the end cover.

[0011] In a possible implementation, a receiving groove is provided on the outer periphery of the bearing seat body, and the vibration-damping sleeve is sleeved in the receiving groove.

[0012] In a possible implementation, the connecting portion includes:

[0013] Connecting lugs, a plurality of connecting lugs are arranged in the circumferential direction of the bearing seat body and extend radially outward;

[0014] A connecting hole is provided on the connecting lug and penetrates through the axial direction of the bearing seat body.

[0015] In a possible implementation, the motor bearing seat further includes:

[0016] At least one positioning portion is disposed on the outer wall of the bearing seat body, and the positioning portion is used to limit the radial displacement of the bearing seat body and the end cover.

[0017] In a possible implementation, the positioning unit includes:

[0018] A positioning lug, the positioning lug is arranged on the outer wall of the bearing seat body and extends radially outward;

[0019] A positioning pin is arranged at one end of the positioning lug close to the inner end surface of the end cover, and the positioning pin is used to be axially inserted into the positioning hole of the inner end surface of the end cover.

[0020] In a possible implementation, the bearing seat body is made of nylon material, and the vibration damping sleeve is made of rubber material.

[0021] In a possible implementation, the motor bearing seat further includes:

[0022] The oil return sleeve is arranged at one end of the bearing seat body, and the oil return sleeve is located on the side of the connecting part away from the vibration damping sleeve, and the oil return sleeve is arranged around the outer periphery of the oil hole opened on the motor shaft.

[0023] In a possible implementation, a plurality of reinforcing ribs are circumferentially provided on the inner wall of the oil-baffle and return-flow sleeve, and the reinforcing ribs are arranged along the axial direction of the oil-baffle and return-flow sleeve.

[0024] In a possible implementation, the inner wall of the oil return sleeve is provided with an inclined guide surface on a side close to the bearing steel sleeve, and the inclined guide surface is used to guide the cooling oil discharged from the oil hole to flow back to the bearing body.

[0025] The beneficial effect of a motor bearing seat provided by the utility model is that: compared with the prior art, the bearing seat body is located inside the end cover, and multiple connection parts on the outer periphery of the bearing seat body are connected to the inner end surface of the end cover. The bearing steel sleeve is arranged around the outer periphery of the bearing body, and the bearing steel sleeve is embedded in the circumference of the inner wall of the bearing seat body. The vibration damping sleeve is arranged on the outer periphery of the bearing seat body. Since the bearing seat body is made of insulating material, it has insulating properties and can isolate the current that breaks through the oil film, avoid the breakdown current directly acting on the steel ball or raceway to produce electrical corrosion marks, avoid bearing failure due to metal peeling, and cause motor failure. In addition, the vibration damping sleeve can buffer the vibration and impact of the entire machine, or the impact generated by the operation of the bearing body, and will not be directly transmitted to the end cover through the bearing seat body, thereby reducing working noise and ensuring the normal operation of the vehicle.

[0026] The utility model also provides a motor, comprising the motor bearing seat.

[0027] The beneficial effect of a motor provided by the utility model is that: compared with the prior art, since the motor uses the above-mentioned motor bearing seat, it has the same beneficial effect as the above-mentioned motor bearing seat. The motor can isolate the current that breaks through the oil film, avoid the breakdown current directly acting on the steel ball or raceway to produce electrical corrosion marks, and avoid the problem of bearing failure caused by metal peeling, which causes motor failure. It can also buffer the vibration and impact of the whole machine, or the impact generated when the bearing body is running, which will not be directly transmitted to the end cover through the bearing seat body, reduce working noise, and ensure the normal operation of the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A three-dimensional diagram of a motor bearing seat provided by the utility model;

[0030] Figure 2 A front view of a motor bearing seat provided by the utility model;

[0031] Figure 3 for Figure 2 Sectional view along AA;

[0032] Figure 4 A three-dimensional diagram of the end cover provided by the utility model;

[0033] Figure 5 This is an assembly state diagram of a motor bearing seat provided by the utility model.

[0034] Description of reference numerals:

[0035] 100, bearing seat body; 110, connecting portion; 111, connecting lug; 112, connecting hole; 113, mounting sleeve; 120, bearing steel sleeve; 130, vibration damping sleeve; 140, positioning portion; 141, positioning lug; 142, positioning pin; 150, oil return sleeve; 151, reinforcing rib; 152, oil return surface; 153, inclined guide surface;

[0036] 200, end cover; 210, threaded hole; 220, positioning hole; 230, mating surface;

[0037] 300, motor shaft; 310, oil hole;

[0038] 400. Bearing body. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0041] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0042] See also Figures 1 to 5 Now, a motor bearing seat provided by the utility model is described. A motor bearing seat includes a bearing seat body 100 and a vibration reduction sleeve 130.

[0043] The bearing seat body 100 is arranged in the end cover 200. The outer periphery of the bearing seat body 100 is provided with multiple connecting parts 110 for connecting to the inner end surface of the end cover 200. The inner wall of the bearing seat body 100 is circumferentially embedded with a bearing steel sleeve 120. The bearing steel sleeve 120 is arranged around the outer periphery of the bearing body 400. The bearing seat body 100 is an insulating material for isolating the breakdown current; the vibration-damping sleeve 130 is sleeved on the outer periphery of the bearing seat body 100, and the vibration-damping sleeve 130 is used to buffer the vibration of the bearing seat body 100 from being transmitted to the end cover 200.

[0044] The utility model provides a motor bearing seat. Compared with the prior art, the bearing seat body 100 is located in the end cover 200, and the multiple connecting parts 110 on the outer periphery of the bearing seat body 100 are connected to the inner end surface of the end cover 200. The bearing steel sleeve 120 is arranged around the outer periphery of the bearing body 400, and the bearing steel sleeve 120 is embedded in the circumference of the inner wall of the bearing seat body 100. The vibration damping sleeve 130 is sleeved on the outer periphery of the bearing seat body 100. Since the bearing seat body 100 is made of insulating material, it has insulating properties and can isolate the current that breaks through the oil film, avoid the breakdown current directly acting on the steel ball or raceway to produce electrical corrosion marks, avoid the bearing failure caused by metal peeling, and cause motor failure. In addition, the vibration damping sleeve 130 can buffer the vibration and impact of the whole machine, or the impact generated when the bearing body 400 is running, and will not be directly transmitted to the end cover 200 through the bearing seat body 100, thereby reducing the working noise and ensuring the normal operation of the car.

[0045] It is worth noting that: the end cover 200 has an assembly body in the middle, the bearing seat body 100 is a sleeve structure, which is installed inside the assembly body, and the multiple connecting parts 110 of the bearing seat body 100 are circumferentially connected to the inner end surface of the assembly body. The bearing steel sleeve 120 is embedded in the inner wall of the bearing seat body 100, and the inner end of the bearing steel sleeve 120 is provided with a steel sleeve flange bent inward. Similarly, an outer flange that also wraps the above-mentioned steel sleeve flange is formed at the inner end of the bearing seat body 100. The inner hole formed by the outer flange is coaxial with the middle hole of the end cover 200 and the inner diameters of the two are the same. The bearing body 400 is installed inside the bearing steel sleeve 120, and one end of the motor shaft 300 passes through the bearing body 400, the bearing seat body 100 and the end cover 200 in sequence and rotates with the bearing body 400. The motor shaft 300 has a hollow oil cavity inside, and the motor shaft 300 is radially opened with an oil hole 310 connected to the oil cavity. The cooling oil enters the inner cavity of the motor through the oil cavity and the oil hole 310 to cool and lubricate the bearings.

[0046] The bearing steel sleeve 120 can prevent the bearing body 400 from directly contacting the bearing seat body 100, causing wear between the outer ring of the bearing body 400 and the inner ring of the bearing seat body 100 during operation, thereby causing the bearing seat body 100 made of insulating material to rupture.

[0047] See also Figure 3 The outer periphery of the bearing seat body 100 is provided with a receiving groove, which is an annular groove, and the vibration-damping sleeve 130 is sleeved in the receiving groove to prevent the vibration-damping sleeve 130 from being displaced axially along the bearing seat body 100. The outer wall of the vibration-damping sleeve 130 protrudes from the receiving groove, and the width of the receiving groove is slightly larger than the width of the vibration-damping sleeve 130. The vibration-damping sleeve 130 protrudes from the receiving groove and can deform itself when squeezed and compress into the receiving groove, thereby buffering the vibration of the bearing seat body 100 from being transmitted to the end cover 200, and the vibration includes the vibration and impact of the whole machine, or the impact generated when the bearing body 400 is running.

[0048] The inner circumference of the assembly body of the end cover 200 has a mating surface 230 , which is processed to have a high degree of smoothness, and the outer circumference of the vibration-damping sleeve 130 abuts against the mating surface 230 to form a mating relationship.

[0049] See also Figure 1 The connecting portion 110 includes a connecting lug 111 and a connecting hole 112. A plurality of connecting lugs 111 are arranged on the circumference of the bearing seat body 100 and extend radially outward. The outer end of the connecting lug 111 is an arc end, and a through hole is coaxially opened on the arc end. A mounting sleeve 113 is embedded in the through hole. The connecting hole 112 is located inside the mounting sleeve 113. The connecting hole 112 is opened along the axial direction of the bearing seat body 100. The connecting hole 112 is a threaded through hole and passes through the connecting lug 111. A plurality of threaded holes 210 are opened at corresponding positions on the inner end surface of the assembly body of the end cover 200. The plurality of threaded holes 210 and the plurality of connecting holes 112 are connected one by one by bolts, so that the bearing seat body 100 is installed on the end cover 200. The bolt fixing method is adopted, which ensures the centering of the bearing body 400 and is also convenient for the disassembly of after-sales faulty parts.

[0050] See also Figure 3 The motor bearing seat also includes at least one positioning portion 140. The positioning portion 140 is disposed on the outer wall of the bearing seat body 100, and the positioning portion 140 is used to limit the radial displacement of the bearing seat body 100 and the end cover 200. Before the bearing seat body 100 is connected with the end cover 200 using multiple connecting portions 110, the positioning portion 140 is first used to locate the position of the bearing seat body 100 and the end cover 200 so that the two are coaxial and will not be displaced radially. At the same time, the connection hole 112 of the connecting portion 110 corresponds coaxially to the threaded hole 210 on the end cover 200, which facilitates the subsequent connection between the two.

[0051] Specifically, the positioning portion 140 includes a positioning lug 141 and a positioning pin 142. The positioning lug 141 is provided on the outer wall of the bearing seat body 100 and extends radially outward. The outer end of the positioning lug 141 is an arc end. The positioning pin 142 is coaxially integrally formed on the lower end surface of the arc end and is located at one end of the positioning lug 141 close to the inner end surface of the end cover 200. The positioning pin 142 is a cylindrical structure, and the end thereof is provided with a tapered guide structure, so as to facilitate insertion into the positioning hole 220 correspondingly opened on the inner end surface of the assembly body of the end cover 200.

[0052] Preferably, the bearing seat body 100 is made of nylon material. The bearing seat body 100 made of nylon material not only ensures its own strength, but also plays an insulating role between the bearing body 400 and the end cover 200, effectively blocking the electrical corrosion damage to the bearing body 400 caused by the high-frequency loop current, and replacing expensive ceramic ball bearings.

[0053] The vibration-damping sleeve 130 is made of rubber, that is, the vibration-damping sleeve 130 is a rubber ring structure, which has the function of reducing vibration and impact, so that when the whole machine is subjected to vibration and impact, or the impact generated when the bearing is running, it is not directly transmitted to the end cover 200 through the bearing seat body 100, thereby ensuring the service life of the bearing seat body 100.

[0054] See also Figures 1 to 3 The motor bearing seat also includes an oil return sleeve 150. The oil return sleeve 150 is arranged at one end of the bearing seat body 100, that is, the oil return sleeve 150 is located on the side of the connecting portion 110 away from the vibration damping sleeve 130. The oil return sleeve 150 and the bearing seat body 100 are integrally formed, and both are made of insulating materials. The oil return sleeve 150 is arranged around the outer periphery of the oil hole 310 opened on the motor shaft 300. The oil return sleeve 150 is arranged in a full circle around the motor shaft 300 to form an embracing manner for the oil hole 310 vertically opened on the motor shaft 300. This design can effectively block the cooling oil sprayed from the vertical oil hole 310 on the shaft motor and guide it to the bearing body 400, so as to prevent the cooling oil from flying away from the bearing body 400 under the action of centrifugal force, so as to deteriorate the lubrication and cooling effect of the bearing body 400. In addition, there is no need to design and install the oil return ring separately, so as to achieve the purpose of reducing costs and shortening axial dimensions. In addition, this design is suitable for the oil hole 310 vertically opened on the motor shaft 300. The vertical oil hole 310 is easier to process, thereby reducing the production cost.

[0055] Among them, a plurality of reinforcing ribs 151 are circumferentially arranged on the inner wall of the oil baffle reflux sleeve 150, and the plurality of reinforcing ribs 151 are grouped in pairs. The two reinforcing ribs 151 in the same group are spaced apart and arranged along the axial direction of the oil baffle reflux sleeve 150. The plurality of reinforcing ribs 151 can increase the structural strength of the oil baffle reflux sleeve 150 itself and reduce its tendency to deformation.

[0056] Specific reference Figure 3 and Figure 5 An oil-blocking surface 152 is formed circumferentially on the inner wall of the oil-blocking reflux sleeve 150, and the oil-blocking surface 152 can block the cooling oil discharged from the oil hole 310. The inner wall of the oil-blocking reflux sleeve 150 is provided with an inclined guide surface 153 on the side close to the bearing steel sleeve 120, and the inclined guide surface 153 can guide the cooling oil blocked by the oil-blocking surface 152 to flow back to the bearing body 400.

[0057] Based on the same inventive concept, the utility model also provides a motor, which has the same beneficial effects as the above-mentioned motor bearing seat because it uses the above-mentioned motor bearing seat. The motor can isolate the current that breaks through the oil film, avoid the breakdown current directly acting on the steel ball or raceway to produce electrical corrosion marks, and avoid the problem of bearing failure caused by metal peeling, which causes motor failure. It can also buffer the vibration and impact of the whole machine, or the impact generated when the bearing body 400 is running, which will not be directly transmitted to the end cover 200 through the bearing seat body 100, reduce working noise, and ensure the normal operation of the car.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor bearing seat, characterized in that: include: A bearing seat body (100), wherein the bearing seat body (100) is arranged in an end cover (200), a plurality of connection parts (110) for connecting to the inner end surface of the end cover (200) are arranged on the outer periphery of the bearing seat body (100), a bearing steel sleeve (120) is circumferentially embedded in the inner wall of the bearing seat body (100), and the bearing steel sleeve (120) is arranged around the outer periphery of the bearing body (400), and the bearing seat body (100) is made of insulating material for isolating breakdown current; A vibration-damping sleeve (130), wherein the vibration-damping sleeve (130) is sleeved on the outer periphery of the bearing seat body (100), and the vibration-damping sleeve (130) is used to buffer the vibration of the bearing seat body (100) from being transmitted to the end cover (200).

2. A motor bearing seat as claimed in claim 1, characterized in that: The outer periphery of the bearing seat body (100) is provided with a receiving groove, and the vibration-damping sleeve (130) is sleeved in the receiving groove.

3. A motor bearing seat as claimed in claim 1, characterized in that: The connecting portion (110) comprises: Connecting lugs (111), a plurality of connecting lugs (111) are arranged in the circumferential direction of the bearing seat body (100) and extend radially outward; A connecting hole (112), wherein the connecting hole (112) is opened on the connecting lug (111) and penetrates the bearing seat body (100) in the axial direction.

4. A motor bearing seat as claimed in claim 1, characterized in that: The motor bearing seat also includes: At least one positioning portion (140), wherein the positioning portion (140) is disposed on an outer wall of the bearing seat body (100), and the positioning portion (140) is used to limit the radial displacement of the bearing seat body (100) and the end cover (200).

5. A motor bearing seat as claimed in claim 4, characterized in that: The positioning portion (140) comprises: A positioning lug (141), wherein the positioning lug (141) is disposed on the outer wall of the bearing seat body (100) and extends radially outward; A positioning pin (142), wherein the positioning pin (142) is arranged at one end of the positioning lug (141) close to the inner end surface of the end cover (200), and the positioning pin (142) is used to be axially inserted into the positioning hole (220) of the inner end surface of the end cover (200).

6. A motor bearing seat as claimed in claim 1, characterized in that: The bearing seat body (100) is made of nylon material, and the vibration-damping sleeve (130) is made of rubber material.

7. A motor bearing seat according to any one of claims 1 to 6, characterized in that: The motor bearing seat also includes: An oil return sleeve (150), the oil return sleeve (150) is arranged at one end of the bearing seat body (100), and the oil return sleeve (150) is located on a side of the connecting portion (110) away from the vibration damping sleeve (130), and the oil return sleeve (150) is arranged around the outer periphery of the oil hole (310) opened on the motor shaft (300).

8. A motor bearing seat as claimed in claim 7, characterized in that: A plurality of reinforcing ribs (151) are circumferentially arranged on the inner wall of the oil-blocking return sleeve (150), and the reinforcing ribs (151) are arranged along the axial direction of the oil-blocking return sleeve (150).

9. A motor bearing seat as claimed in claim 7, characterized in that: The inner wall of the oil return sleeve (150) is provided with an inclined guide surface (153) on a side close to the bearing steel sleeve (120), and the inclined guide surface (153) is used to guide the cooling oil discharged from the oil hole (310) to flow back to the bearing body (400).

10. A motor, characterized in that: Comprising a motor bearing seat as described in any one of claims 1-9.

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