Motor, power assembly and vehicle
By setting a limit structure in the motor to fix the bearing, the axial squirming problem of the motor shaft and reducer input shaft under bumpy road conditions is solved, bearing wear is avoided, the reliability of the motor and powertrain is improved, and the vehicle is ensured. security.
Patent Information
- Application Number
- CN202420867134.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-24
AI Technical Summary
The input shafts of existing motor shafts and reducers are prone to axial squirting under bumpy road conditions, resulting in bearing wear and affecting the safety of the vehicle.
The bearing is provided in the motor, and the bearing includes an inner ring, a rolling element and an outer ring, and the bearing is limited to fix through the first limit structure and the second limit structure to avoid frequent axial movement of the bearing.
It effectively avoids bearing wear, improves the reliability of the motor and powertrain, and improves the safety of the vehicle use.
Smart Images
Figure CN222215410U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and in particular to a motor, a power assembly and a vehicle. Background Art
[0002] The powertrain of a vehicle includes a motor and a reducer. Generally, the motor shaft and the input shaft of the reducer are coaxially connected, so that the power of the motor is transmitted to the reducer, and the power is transmitted to the wheels through the reducer, thereby driving the vehicle.
[0003] Generally, the motor shaft and the input shaft of the reducer are connected by bearings, and a bearing is installed on the outer side of the end of the motor shaft away from the input shaft of the reducer. The fixed structure of the bearing on the motor side is relatively simple, and only part of the bearing is connected to the motor housing, so that most of the bearing structure is a floating design. When the vehicle encounters bumpy road conditions, the motor shaft and the input shaft of the reducer will produce axial movement, causing the bearing on the motor side to also produce axial movement, thereby wearing the bearing, making the connection between the bearing and the motor shaft unreliable, affecting the safety of the vehicle. Utility Model Content
[0004] The main purpose of the utility model is to provide a motor, aiming to improve the reliability of the motor and improve the safety of vehicle use.
[0005] To achieve the above-mentioned purpose, the motor proposed by the utility model includes:
[0006] Motor shaft;
[0007] A bearing is sleeved outside the motor shaft, and the bearing comprises an inner ring, a rolling element and an outer ring;
[0008] a first limiting structure, the first limiting structure being in contact with the inner ring; and
[0009] a second limiting structure, wherein the second limiting structure is in contact with the outer ring;
[0010] Wherein, the first limiting structure and the second limiting structure are located on opposite sides of the bearing.
[0011] Optionally, a stop shoulder is provided on the motor shaft, the stop shoulder is in contact with the inner ring, and the stop shoulder and the first limiting structure are located on opposite sides of the bearing.
[0012] Optionally, the first limiting structure includes a mounting groove and a stopper, the motor shaft is provided with the mounting groove, and the stopper is installed in the mounting groove and contacts the inner ring.
[0013] Optionally, the stopper is configured as a snap ring.
[0014] Optionally, along the axial direction of the motor shaft, the side of the outer ring away from the second limiting structure is used to contact the housing of the motor.
[0015] Optionally, the second limiting structure is detachably connected to the housing of the motor.
[0016] Optionally, the second limiting structure is configured as a pressure plate, and the pressure plate is sleeved outside the motor shaft.
[0017] Optionally, the pressure plate is configured as a hollow structure between the outer ring and the inner ring.
[0018] The utility model also provides a power assembly, comprising a reducer and the motor, wherein the motor is drivingly connected to the reducer.
[0019] The utility model also provides a vehicle, comprising the motor or the power assembly.
[0020] A technical solution of the utility model is to install and fix the motor shaft by arranging a bearing and a motor shaft in the motor so that the bearing sleeve is arranged outside the motor shaft. The bearing includes an inner ring, a rolling body and an outer ring, and the outer ring is sleeved outside the inner ring. A first limiting structure in contact with the inner ring is arranged at the inner ring, and a second limiting structure in contact with the outer ring is arranged at the outer ring, so that the first limiting structure and the second limiting structure limit and fix the bearing, and realize the axial limiting of the bearing, so that when the motor shaft and the input shaft of the reducer have axial movement, resulting in the bearing on the motor side bearing the axial load on the reducer side frequently changing, the frequent axial movement of the bearing on the motor side is avoided, the wear of the rolling body of the bearing is avoided, and then the failure of the bearing is avoided, the reliability of the motor is guaranteed, the reliability of the power assembly is guaranteed, and the safety of the vehicle is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0022] Figure 1 It is a structural schematic diagram of an embodiment of a motor of the utility model.
[0023] Description of Figure Numbers:
[0024]
[0025]
[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B; in addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0030] The powertrain of a vehicle includes a motor and a reducer. Generally, the motor shaft and the input shaft of the reducer are coaxially connected, so that the power of the motor is transmitted to the reducer, and the power is transmitted to the wheels through the reducer, thereby driving the vehicle.
[0031] The motor shaft and the input shaft of the reducer are generally fixed to the housing of the transmission through bearing supports. Currently, the common ones include an integrated three-bearing support structure, a two-bearing support structure, a four-bearing support structure, etc. Taking the integrated three-bearing support structure as an example, the motor shaft and the input shaft of the reducer are concentric shafts, one of which is sleeved on the outside of the other. Taking the input shaft of the reducer being sleeved outside the motor shaft as an example, along the axial direction of the motor shaft, a bearing is sleeved at the end of the input shaft of the reducer away from the motor shaft, a bearing is sleeved at the connection between the input shaft of the reducer and the motor shaft, a bearing is sleeved at the end of the motor shaft away from the input shaft of the reducer, and the bearing at the end of the motor shaft away from the input shaft of the reducer is connected to the housing of the motor, thereby realizing the fixed installation of the motor shaft and the input shaft of the reducer.
[0032] The bearing on the motor side, which is located at one end of the motor shaft away from the input shaft of the reducer, has a relatively simple fixed structure. Only part of the bearing is connected to the motor housing, and the other part of the bearing has no fixed structure, so that most of the bearing structures are floating designs. In this way, when the vehicle encounters bumpy road conditions, the motor shaft and the input shaft of the reducer will have axial movement, causing the bearing on the motor side to also have axial movement, thereby causing the bearing to wear and easily damage the bearing, which in turn causes the motor to be unreliable, thereby affecting the safety of the vehicle.
[0033] In view of this, the utility model provides a motor.
[0034] Please refer to Figure 1 In the embodiment of the utility model, the motor includes a motor shaft 100, a bearing 200, a first limiting structure 251 and a second limiting structure 252. The motor shaft 100 is used to transmit the power of the motor to the reducer, and then to the wheels, so as to drive the vehicle to travel.
[0035] The bearing 200 is sleeved outside the motor shaft 100, and the bearing 200 refers to the bearing 200 on the motor side. The bearing 200 includes an inner ring 210, a rolling element, and an outer ring 220. The outer ring 220 is sleeved outside the inner ring 210, and a rolling element is arranged between the inner ring 210 and the outer ring 220. A first limiting structure 251 is arranged at the inner ring 210, and the first limiting structure 251 contacts the inner ring 210. A second limiting structure 252 is arranged at the outer ring 220, and the second limiting structure 252 contacts the outer ring 220. The first limiting structure 251 and the second limiting structure 252 are located on opposite sides of the bearing 200.
[0036] Specifically, the bearing 200 is sleeved outside the motor shaft 100, so as to realize the installation and fixation of the motor shaft 100. The bearing 200 includes an inner ring 210, a rolling element and an outer ring 220. The outer ring 220 is sleeved outside the inner ring 210, and a rolling element is arranged between the two. In one embodiment, the rolling element includes a cage and a plurality of balls embedded in the cage. When the bearing 200 is sleeved on the motor shaft 100, the inner ring 210 of the bearing 200 contacts the motor shaft 100. When the motor shaft 100 rotates, the inner ring 210 rotates with the rotation of the motor shaft 100. At this time, the balls in the cage also rotate with it, and the outer ring 220 is a stationary part and does not rotate with it. In order to achieve the installation and fixation of the bearing 200, a first limiting structure 251 in contact with the inner ring 210 is set at the inner ring 210 of the bearing 200, and a second limiting structure 252 in contact with the outer ring 220 is set at the outer ring 220. Along the axial direction of the motor shaft 100, the first limiting structure 251 and the second limiting structure 252 are respectively located on opposite sides of the bearing 200.
[0037] A technical solution of the utility model is to arrange a bearing 200 and a motor shaft 100 in the motor so that the bearing 200 is sleeved outside the motor shaft 100 , thereby achieving installation and fixation of the motor shaft 100 . The bearing 200 includes an inner ring 210, rolling elements and an outer ring 220. The outer ring 220 is sleeved outside the inner ring 210. A first limiting structure 251 in contact with the inner ring 210 is provided at the inner ring 210, and a second limiting structure 252 in contact with the outer ring is provided at the outer ring 220. The first limiting structure 251 and the second limiting structure 252 limit and fix the bearing 200, thereby realizing axial limiting of the bearing 200. Therefore, when the motor shaft 100 and the input shaft of the reducer have axial movement, resulting in the bearing 200 on the motor side being subjected to frequent changes in the axial load on the reducer side, frequent axial movement of the bearing 200 on the motor side is avoided, wear of the rolling elements of the bearing 200 is avoided, and failure of the bearing 200 is avoided, thereby ensuring the reliability of the motor, ensuring the reliability of the powertrain, and improving the safety of vehicle use.
[0038] Furthermore, a stop shoulder 120 is provided on the motor shaft 100 , the stop shoulder 120 is in contact with the inner ring 210 , and the stop shoulder 120 and the first limiting structure 251 are located on opposite sides of the bearing 200 .
[0039] Specifically, along the axial direction of the motor shaft 100, the bearing 200 has a first end 231 and a second end 232. For the convenience of explanation, the end of the bearing 200 away from the reducer is defined as the first end 231, and the end of the bearing 200 close to the reducer is defined as the second end 232. The motor shaft 100 is provided with a shoulder 120, and the outer diameter of the shoulder 120 is less than or equal to the outer diameter of the inner ring 210, so that at least part of the shoulder 120 overlaps with the inner ring 210, so that the end face of the shoulder 120 abuts against the end face of the second end 232 of the inner ring 210, so that the shoulder 120 is used to fix the second end 232 of the inner ring 210. In this way, the shoulder 120 is directly provided on the motor shaft 100 to fix the inner ring 210, thereby avoiding the need for additional fixings, which is conducive to the lightweight of the motor. At the same time, the first limiting structure 251 contacts the first end 231 of the bearing 200, and the shoulder 120 contacts the second end 232 of the inner ring 210. In this way, the first limiting structure 251 and the shoulder 120 cooperate to limit and fix the axial direction of the inner ring 210 of the bearing 200.
[0040] Furthermore, the first limiting structure 251 includes a mounting groove 110 and a stopper 310 . The motor shaft 100 is provided with the mounting groove 110 . The stopper 310 is installed in the mounting groove 110 and contacts the inner ring 210 .
[0041] Specifically, in the scheme shown in the drawings of the present utility model, the first limiting structure 251 includes a mounting groove 110 and a stopper 310. The motor shaft 100 is provided with a mounting groove 110, the mounting groove 110 is close to the first end 231 of the inner ring 210, and along the radial direction of the motor shaft 100, the mounting groove 110 has a certain depth, at least part of the stopper 310 is in the mounting groove 110, so as to achieve the fixing of the stopper 310; at least part of the stopper 310 is exposed from the mounting groove 110 to contact and abut with the inner ring 210. More specifically, along the axial direction of the motor shaft 100, one end face of the stopper 310 contacts and abuts with the end face of the first end 231 of the inner ring 210, so as to achieve the limiting of the first end 231 of the inner ring 210. In one embodiment, the stopper 310 is configured as a snap ring. Of course, in other embodiments, the stopper 310 can also be a locking nut.
[0042] Furthermore, along the axial direction of the motor shaft 100 , the side of the outer ring 220 away from the second limiting structure 252 is used to contact the housing of the motor.
[0043] Specifically, the second limiting structure 252 contacts the second end 232 of the outer ring 220, the first end 231 of the outer ring 220 contacts and abuts the housing of the motor, and the housing of the motor connected to the bearing 200 constitutes the first outer limiting structure. In this way, the first end 231 of the outer ring 220 contacts and abuts the housing of the motor, and the second end 232 contacts and abuts the second limiting structure 252, thereby realizing the axial limiting of the outer ring 220, and at the same time realizing the connection between the bearing 200 and the housing of the motor, and part of the axial movement can be transmitted to the housing of the motor through the bearing 200, thereby alleviating the axial movement of the motor shaft 100. In addition, the first end 231 of the outer ring 220 is fixedly limited by the housing of the motor, which also avoids the setting of additional fixings, which is conducive to the lightweight and low cost of the motor.
[0044] Furthermore, the second limiting structure 252 is detachably connected to the housing of the motor.
[0045] Specifically, in one embodiment, the second limiting structure 252 is detachably connected to the housing of the motor, thereby realizing the installation of the second limiting structure 252, and at the same time realizing the connection between the bearing 200 and the housing of the motor, so that part of the axial movement can be transmitted to the housing of the motor through the bearing 200, thereby alleviating the axial movement of the motor shaft 100. In addition, compared with the method of integrally setting the second limiting structure 252 and the housing of the motor, the detachable connection method of the utility model avoids the interference between the second limiting structure 252 and the bearing, the motor shaft and other structural parts during the installation of the motor housing, and ensures the smoothness of the installation of the motor housing.
[0046] Furthermore, the second limiting structure 252 is configured as a pressing plate 320 , and the pressing plate 320 is sleeved outside the motor shaft 100 .
[0047] Specifically, in the scheme shown in the drawings of the present utility model, the second limiting structure 252 is configured as a pressure plate 320, and the pressure plate 320 is sleeved outside the motor shaft 100, and in the axial direction of the motor shaft 100, at least part of the pressure plate 320 overlaps with the outer ring 220, so that the pressure plate 320 is in contact with the second end 232 of the outer ring 220. In this way, the second end 232 of the outer ring 220 is limited. In one embodiment, the pressure plate 320 is connected to the housing of the motor by bolts, so as to fix the pressure plate 320. Of course, in other embodiments, the second limiting structure 252 can also be a locking nut.
[0048] At the same time, compared with the solution of only setting the shoulder 120 on the second end 232 side and the shoulder 120 having a larger outer diameter to simultaneously limit the inner ring 210 and the outer ring 220, the utility model sets the limiting structure shoulder 120 of the inner ring 210 and the limiting structure pressure plate 320 of the outer ring 220 independently on the second end 232 side of the bearing 200, thereby avoiding the shoulder 120 with a larger outer diameter from blocking the cooling oil path of the motor shaft 100 and the bearing 200 and affecting the cooling effect of the motor; it also avoids the interference between the shoulder 120 with a larger outer diameter and the motor housing during the installation of the motor housing; in addition, the inner ring 210 of the bearing 200 needs to rotate with the motor shaft 100, while the outer ring 220 needs to remain stationary. If only the shoulder 120 with a larger outer diameter is set on the second end 232 side, the outer ring 220 will also rotate with the motor shaft 100, thereby wearing the rolling elements of the bearing 200 and reducing the service life of the bearing 200.
[0049] Furthermore, the pressure plate 320 is configured as a hollow structure between the outer ring 220 and the inner ring 210 .
[0050] Specifically, the pressure plate 320 is sleeved outside the motor shaft 100, and the pressure plate 320 is set to a hollow structure corresponding to the position between the outer ring 220 and the inner ring 210 of the bearing 200, so that the heat dissipation at the rolling element position of the bearing 200 is convenient to avoid excessive operating temperature of the bearing 200. In one embodiment, along the axial direction of the motor shaft 100, at least part or all of the overlap between the pressure plate 320 and the outer ring 220 is a solid structure to ensure that the pressure plate 320 is fixed to the outer ring 220.
[0051] In one embodiment, the bearing 200 is a grease bearing with a sealing cover. The bearing 200 is provided with a sealing cover 240, so that particulate foreign matter can be effectively prevented from entering the bearing 200, reducing the risk of increased wear of the steel ball of the bearing 200, improving the risk of foreign matter intrusion, thereby increasing the service life of the bearing 200, ensuring the reliability of the motor, and improving the safety of the vehicle.
[0052] The utility model also proposes a power assembly, which includes a reducer and a motor. The specific structure of the motor refers to the above embodiment. Since the power assembly adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The motor and the reducer are connected in a transmission manner so that the power of the motor is transmitted to the wheels through the reducer, thereby driving the vehicle.
[0053] The utility model also proposes a vehicle, which includes a power assembly. The specific structure of the power assembly refers to the above-mentioned embodiments. Since the vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.
[0054] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A motor, characterized in that: include: Motor shaft; A bearing is sleeved outside the motor shaft, and the bearing comprises an inner ring, a rolling element and an outer ring; a first limiting structure, the first limiting structure being in contact with the inner ring; and a second limiting structure, wherein the second limiting structure is in contact with the outer ring; Wherein, the first limiting structure and the second limiting structure are located on opposite sides of the bearing.
2. The motor according to claim 1, characterized in that The motor shaft is provided with a stop shoulder, the stop shoulder is in contact with the inner ring, and the stop shoulder and the first limiting structure are located on opposite sides of the bearing.
3. The motor according to claim 1, characterized in that The first limiting structure includes a mounting groove and a stopper. The motor shaft is provided with the mounting groove. The stopper is installed in the mounting groove and contacts the inner ring.
4. The motor according to claim 3, characterized in that The stopper is configured as a snap ring.
5. The motor according to claim 1, characterized in that Along the axial direction of the motor shaft, the outer ring is located away from the second limiting structure and is used to contact the housing of the motor.
6. The motor according to claim 5, characterized in that The second limiting structure is detachably connected to the housing of the motor.
7. The motor according to claim 1, characterized in that The second limiting structure is configured as a pressure plate, and the pressure plate is sleeved outside the motor shaft.
8. The motor according to claim 7, characterized in that The pressure plate is configured as a hollow structure between the outer ring and the inner ring.
9. A powertrain, characterized in that: It comprises a reducer and a motor as claimed in any one of claims 1 to 8, wherein the motor is drivingly connected to the reducer.
10. A vehicle, characterized in that: It comprises the motor according to any one of claims 1 to 8, or the power assembly according to claim 9.