CN218335557U - Motor, electric power steering system and vehicle - Google Patents

Abstract

The utility model provides a motor, electric power assisted steering system and vehicle, wherein, the motor includes: a housing; the bearing seat is arranged on the shell; the bearing is located in the bearing chamber, and the bearing includes: a plurality of rolling bodies; the rotor is provided with a rotating shaft arranged along the central axis, and the rotating shaft penetrates through the bearing; the stator is arranged in the shell and is arranged opposite to the rotor in the radial direction; the reinforcing ribs are connected with the shell and the bearing seat and located at the joint of the shell and the bearing seat, and the number of the reinforcing ribs is different from that of the rolling bodies. Because the quantity of strengthening rib is different with the quantity of rolling element, what a plurality of rolling elements received is not the reaction force of one-to-one to dispersed stress can not appear stress concentration's phenomenon, under the condition that the rolling element atress was dispersed, the bearing operation was more steady, can reduce the friction torque of motor operation in-process.

Description

Motor, electric power steering system and vehicle

Technical Field

The utility model belongs to the technical field of electrical equipment, particularly, relate to a motor, electric power steering system and vehicle.

Background

In an electric power steering system, since the friction torque of a motor has a great influence on the life of a bearing, how to reduce the friction torque of the motor is a problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art or the correlation technique.

In view of this, the first aspect provides a motor, include: a housing; the bearing seat is arranged on the shell and provided with a bearing chamber; the bearing is located the bearing room, and the bearing includes: a plurality of rolling bodies; the rotor is provided with a rotating shaft arranged along the central axis, and the rotating shaft penetrates through the bearing; a stator disposed in the housing, the stator being disposed radially opposite to the rotor; the reinforcing ribs are connected with the shell and the bearing seat and located at the joint of the shell and the bearing seat, and the number of the reinforcing ribs is different from that of the rolling bodies.

The utility model provides a motor is provided with the bearing frame on the casing, and the bearing frame can integrated into one piece in the casing. The bearing block may be of annular hollow construction, so a bearing chamber is formed in the bearing block, the bearing chamber being for mounting a bearing therein. The casing and the bearing frame are connected to the strengthening rib, and the strengthening rib can play the supporting role to the junction of casing and bearing frame. In the running process of the motor, the force applied to the rotating shaft of the motor is transferred to the bearing, and the bearing transfers the force to the bearing seat. The bearing seat is supported by the reinforcing ribs, the bearing seat is not prone to shaking relative to the shell, the connection stability of the bearing seat and the shell is improved, the rigidity of the shell and the bearing seat is improved, and under the condition that the structure of the bearing seat is stable, the bearing seat can stably support the bearing, so that the operation stability of the motor is improved.

The bearing includes: the bearing comprises an outer ring, a plurality of rolling bodies and an inner ring, wherein the rolling bodies are positioned between the outer ring and the inner ring, the inner ring is in contact with the rotating shaft, and the outer ring is in contact with the inner wall of the bearing chamber. The number of the reinforcing ribs is different from that of the rolling bodies, so that the abrasion of the bearing rolling bodies can be reduced. Specifically, at motor operation in-process, the pivot will be power and pass through the inner circle and transmit the rolling element, and the rolling element outwards continues the in-process of transmission power, if the quantity of rolling element and strengthening rib is the same, a plurality of rolling bodys will be forced the one-to-one and transmit the strengthening rib, and a plurality of rolling bodys also can receive the reaction that a plurality of strengthening ribs correspond, and the mode of one-to-one transmission power can lead to the phenomenon of taking place stress concentration to cause the easy atress inequality of bearing and damage. The utility model discloses in the quantity that sets up the rolling element is different with the quantity of strengthening rib, and when power was transmitted between rolling element and strengthening rib, because a plurality of rolling elements can't transmit power for the strengthening rib one by one, consequently a plurality of rolling bodies can transmit power for the bearing frame earlier, and the bearing frame will exert oneself again and disperse for a plurality of strengthening ribs. Likewise, the plurality of rolling elements can receive a uniform reaction force from the bearing housing. Therefore, the plurality of rolling bodies are subjected to the reaction force which is not in one-to-one correspondence, so that the stress is dispersed, the phenomenon of stress concentration is avoided, the bearing runs more stably under the condition that the stress of the rolling bodies is dispersed, and the friction torque in the running process of the motor can be reduced. And because the stress is dispersed, the damage of the rolling body can be effectively reduced, thereby prolonging the service life of the bearing.

In addition, according to the utility model provides an among the above-mentioned technical scheme motor can also have following additional technical characteristics:

in the technical scheme, the plurality of reinforcing ribs are distributed at intervals along the circumferential direction of the bearing seat.

In this technical scheme, because the circumference interval distribution of a plurality of strengthening ribs along the bearing frame for the bearing frame is relatively dispersed along the stress point of circumference, avoids appearing the concentrated problem of atress, is favorable to improving the stability of being connected of bearing frame and casing.

In any one of the above technical solutions, the plurality of reinforcing ribs are uniformly distributed along the circumferential direction of the bearing seat.

In this technical scheme, because a plurality of strengthening ribs are along the circumference evenly distributed of bearing frame for the bearing frame can the atress even, under the condition of bearing frame atress, a plurality of strengthening ribs can support the bearing frame steadily, avoid the relative casing of bearing frame to rock or skew, are favorable to improving the connection stability of bearing frame and casing. A plurality of strengthening ribs support the bearing frame steadily, therefore the bearing can be installed in the bearing frame steadily, is favorable to improving the cooperation stability of pivot and bearing to promote the performance of motor.

In any of the above solutions, the rolling element includes: ball rolling elements, tapered roller rolling elements or cylindrical rolling elements.

In the technical scheme, according to different use requirements, one of a ball rolling element, a tapered roller rolling element or a cylindrical rolling element can be adopted, and the matching stability of the shaft body and the rotating shaft is ensured.

In any of the above technical solutions, the number of the reinforcing ribs is at least three.

In the technical scheme, the number of the reinforcing ribs is at least three, and the at least three reinforcing ribs are uniformly distributed along the circumferential direction of the bearing seat. When the quantity of strengthening rib is under the three condition, the bearing frame has three strong point, and according to triangle-shaped stable principle, stable support to the bearing frame can be realized to at least three strengthening rib.

Through the quantity that increases the strengthening rib, can improve the connection stability of bearing frame and casing. And if the quantity of strengthening rib is too much, not only extravagant material cost, the amplification effect to stability is also less moreover, consequently, can set up the quantity of strengthening rib according to the atress condition of bearing.

In any of the above technical solutions, the number of the rolling bodies is greater than the number of the reinforcing ribs.

In this technical scheme, the quantity of rolling element is greater than the quantity of strengthening rib, and when power was transmitted between rolling element and strengthening rib, because a plurality of rolling elements can't transmit the strengthening rib for one by one, consequently a plurality of rolling elements can transmit the power earlier for the bearing frame, and the bearing frame will exert oneself again and disperse for a plurality of strengthening ribs. Likewise, the plurality of rolling elements can receive a uniform reaction force from the bearing housing. Therefore, the reaction force which is not in one-to-one correspondence is applied to the rolling bodies, so that stress is dispersed, the phenomenon of stress concentration is avoided, the bearing runs more stably under the condition that the stress of the rolling bodies is dispersed, and the friction torque in the running process of the motor can be reduced. And because the stress is dispersed, the damage of the rolling body can be effectively reduced, and the service life of the bearing is prolonged.

In any of the above technical solutions, the length of the reinforcing rib is L1, the length of the bearing seat is L2, and L1 is greater than or equal to 0.5 × L2 along the axial direction of the bearing.

In this technical scheme, the strengthening rib plays support and reinforced (rfd) effect to the bearing frame, and the relative length of strengthening rib and bearing frame has the influence to supporting and strengthening the effect. The length of the bearing seat along the axial direction is set to be L2, the length of the reinforcing rib along the axial direction of the bearing seat is set to be L1, and L1 and L2 meet the condition that L1 is more than or equal to 0.5 multiplied by L2, so that the length of the reinforcing rib is more than or equal to half of the length of the bearing seat. The length of injecing the strengthening rib satisfies above-mentioned condition with the relative relation of the length of bearing frame, and the structural strength at the middle part of bearing frame is more weak, and consequently, the strengthening rib supports the middle part of bearing frame at least, is favorable to improving the support and the reinforcement effect to the bearing frame, and the bearing frame is under the condition of atress, and the difficult fracture of appearing of bearing frame, damaged condition to improve the structural stability of bearing frame.

In any of the above technical solutions, a straight line L is provided to extend along a radial direction of the bearing, and two of the plurality of reinforcing ribs pass through the straight line L.

In this solution, the straight line L extends in the radial direction of the bearing, so that the straight line L passes through the axis of the bearing. The straight line L passes through two reinforcing ribs in the plurality of reinforcing ribs, and the two reinforcing ribs passing through the straight line L serve as a group of reinforcing ribs, and the two reinforcing ribs in the group of reinforcing ribs are symmetrically arranged on the two radial sides of the bearing seat. Illustratively, the number of the reinforcing ribs is 6, and the central angle of two adjacent reinforcing ribs is 60 degrees. Every two reinforcing ribs in 6 reinforcing ribs are symmetrically arranged.

Because two strengthening ribs in a set of strengthening rib are the symmetry setting of bearing frame relatively to can ensure that the bearing frame atress is balanced, be difficult for appearing stress concentration's problem between bearing and the bearing frame, thereby can further reduce the spoilage of bearing, and improve the cooperation stability of pivot and bearing.

In any of the above aspects, the housing comprises: the casing is connected with the cover body, the annular plate is arranged on the cover body and extends out of the circumferential outer edge of the cover body, and a step part is formed between the annular plate and the cover body.

In this technical scheme, the annular plate sets up the circumference outer edge at the lid, along the axial of bearing, and the circumference outer edge of annular plate protrusion lid when assembling the casing of lid and motor, can stretch into the casing of motor to the space that the annular plate encloses and establishes to in the assembly of realization lid and casing.

In a possible application, the annular plate and the cover body are of an integrally formed structure, and the processing difficulty of the annular plate and the cover body is favorably reduced.

Since the stepped portion is formed between the annular plate and the lid body and the position of the stepped portion is not filled with a material, the material cost can be reduced, and the processing cost can be reduced.

In one possible application, the cover is circular in radial cross-section along the bearing so as to be stably engaged with the annular plate.

In any of the above technical solutions, the casing and the cover are in interference fit.

In any of the above technical solutions, the reinforcing ribs are integrally formed on the bearing housing and/or the housing.

In this technical scheme, bearing frame and/or casing and strengthening rib are injection moulding's structure as an organic whole, and the mode of integrated into one piece can reduce the independent installation capacity to the strengthening rib. Moreover, the structural strength can be improved by the aid of the integrated injection molding mode, the reinforcing effect of the reinforcing ribs on the bearing seat and the shell is favorably improved, and the stability of the motor in operation is favorably improved.

In any of the above technical solutions, the reinforcing ribs are cut along the radial direction of the bearing, and the cross section of each reinforcing rib is triangular or right trapezoid.

In this technical scheme, follow axial radial intercepting strengthening rib, the cross-section of strengthening rib is triangle-shaped, utilizes the stable advantage of triangle-shaped, and the strengthening rib that the cross-section is triangle-shaped is better to the reinforcing effect of bearing frame and lid, improves the structural stability of bearing frame for the bearing frame can be fixed the bearing steadily and spacing, thereby can improve the stability of pivot and bearing transmission moment of torsion.

The reinforcing ribs are cut along the axial radial direction, and the cross sections of the reinforcing ribs can also be set to be trapezoidal.

In other technical schemes, the reinforcing ribs are cut along the axial radial direction, and the cross sections of the reinforcing ribs can also be square, rectangular and the like.

In a second aspect, the present invention provides an electric power steering system, including the motor according to any one of the above possible technical solutions, therefore the present invention provides an electric power steering system having all the beneficial effects of the motor provided in the above technical solutions.

Among them, the electric power steering system is an electric power steering system that directly relies on a motor to provide an assist torque power, and the EPS system has many advantages compared to the conventional HPS. The EPS mainly comprises a torque sensor, a vehicle speed sensor, a motor, a speed reducing mechanism, an electronic control unit and the like.

Third aspect, the utility model provides a vehicle, include the electric power steering system as in above-mentioned technical scheme, consequently the utility model provides a vehicle has the whole beneficial effect of the electric power steering system who provides among the above-mentioned technical scheme.

The vehicle can be a traditional fuel vehicle or a new energy vehicle. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows one of the schematic structural diagrams of a bearing seat, a reinforcing rib and a cover body in an embodiment of the invention;

fig. 2 shows a second schematic structural view of the bearing seat, the reinforcing rib and the cover body according to an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a motor in an embodiment of the present invention;

fig. 4 shows a schematic structural diagram of an electric power steering system according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:

100 casing, 110 cover body, 120 bearing seat, 130 bearing chamber, 140 bearing, 141 inner ring, 142 rolling body, 143 outer ring, 150 reinforcing rib, 160 annular plate, 170 step part, 210 casing, 220 rotating shaft, 230 rotor, 240 stator, 300 motor, 400 electric power steering system, 411 steering wheel, 412 steering shaft, 413 universal joint, 414 rotating shaft, 415 rack and pinion mechanism, 416 rack shaft, 417 steering wheel, 421 steering torque sensor, 422 control unit, and 423 reduction mechanism.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An electric machine, an electric power steering system, and a vehicle provided according to some embodiments of the present invention are described below with reference to fig. 1 to 4.

In some embodiments of the present invention, as shown in fig. 1, 2 and 3, an electric machine is provided, including: housing 100, bearing housing 120, bearing 140, rotor 230, stator 240, and reinforcing ribs 150. The bearing housing 120 is disposed in the housing 100, the bearing housing 120 is disposed with a bearing chamber 130, the bearing 140 is disposed in the bearing chamber 130, and the bearing 140 includes: a plurality of rolling elements. The rotor 230 has a rotating shaft 220 disposed along the central axis, the rotating shaft 220 passes through the bearing 140, the stator 240 is disposed in the housing 100, and the stator 240 is disposed to be radially opposed to the rotor 230. The reinforcing ribs 150 are connected with the housing 100 and the bearing seat 120, the reinforcing ribs 150 are positioned at the connection part of the housing 100 and the bearing seat 120, and the number of the reinforcing ribs 150 is different from that of the rolling bodies.

In the motor provided in this embodiment, the housing 100 is provided with the bearing seat 120, and the bearing seat 120 may be integrally formed with the housing 100. The bearing housing 120 may have a hollow structure in a ring shape, so that a bearing chamber 130 is formed in the bearing housing 120, and a bearing 140 is installed in the bearing chamber 130. The reinforcing ribs 150 connect the housing 100 and the bearing housing 120, and the reinforcing ribs 150 can support the connection between the housing 100 and the bearing housing 120. During the operation of the motor, the force applied to the rotating shaft 220 of the motor is transmitted to the bearing 140, and the bearing 140 transmits the force to the bearing seat 120. The bearing seat 120 is supported by the reinforcing ribs 150, the bearing seat 120 is not easy to shake relative to the shell 100, the connection stability of the bearing seat 120 and the shell 100 is improved, the rigidity of the bearing seat 120 and the shell 100 is improved, and the bearing seat 120 can stably support the bearing 140 under the condition that the structure of the bearing seat 120 is stable, so that the operation stability of the motor is improved.

The bearing 140 includes: an outer ring 143, a plurality of rolling bodies 142, and an inner ring 141, the plurality of rolling bodies 142 being positioned between the outer ring 143 and the inner ring 141, the inner ring 141 being in contact with the rotation shaft 220, and the outer ring 143 being in contact with an inner wall of the bearing chamber 130. By providing the number of ribs 150 different from the number of rolling elements 142, wear of the rolling elements 142 of the bearing 140 can be reduced. Specifically, in the process of the motor running, the rotating shaft 220 transmits force to the rolling elements 142 through the inner ring 141, and the rolling elements 142 continue to transmit force outwards, if the number of the rolling elements 142 is the same as that of the reinforcing ribs 150, the plurality of rolling elements 142 transmit force to the reinforcing ribs 150 in a one-to-one correspondence manner, and the plurality of rolling elements 142 also receive reaction corresponding to the plurality of reinforcing ribs 150, so that the stress concentration phenomenon is caused in the one-to-one correspondence force transmission manner, and the bearing 140 is easily damaged due to uneven stress. The utility model discloses in the quantity that sets up rolling element 142 is different with the quantity of strengthening rib 150, and when power was transmitted between rolling element 142 and strengthening rib 150, because a plurality of rolling elements 142 can't transmit power for strengthening rib 150 one by one, consequently a plurality of rolling elements 142 can transmit power for bearing frame 120 earlier, and bearing frame 120 will do all can the power dispersion again and give a plurality of strengthening ribs 150. Likewise, the plurality of rolling bodies 142 can also receive a uniform reaction force from the bearing housing 120. Therefore, the plurality of rolling elements 142 are subjected to reaction forces which are not in one-to-one correspondence, so that stress is dispersed, the phenomenon of stress concentration is avoided, and under the condition that the stress of the rolling elements 142 is dispersed, the bearing 140 runs more stably, and the friction torque in the running process of the motor can be reduced. Further, since the stress is dispersed, damage of the rolling elements 142 can be effectively reduced, thereby improving the service life of the bearing 140.

In the above embodiment, the plurality of reinforcing ribs 150 are spaced apart along the circumferential direction of the bearing housing 120.

In this embodiment, since the plurality of reinforcing ribs 150 are distributed along the circumferential direction of the bearing housing 120 at intervals, the stress points of the bearing housing 120 along the circumferential direction are relatively dispersed, the problem of stress concentration is avoided, and the improvement of the connection stability between the bearing housing 120 and the housing 100 is facilitated.

In any of the above embodiments, as shown in fig. 1 and 2, the plurality of ribs 150 are uniformly distributed along the circumferential direction of the bearing housing 120.

In this embodiment, since the plurality of reinforcing ribs 150 are uniformly distributed along the circumferential direction of the bearing housing 120, the bearing housing 120 can be uniformly stressed, and when the bearing housing 120 is stressed, the plurality of reinforcing ribs 150 can stably support the bearing housing 120, so as to prevent the bearing housing 120 from shaking or shifting relative to the housing 100, which is beneficial to improving the connection stability between the bearing housing 120 and the housing 100. The plurality of reinforcing ribs 150 stably support the bearing housing 120, so that the bearing 140 can be stably installed in the bearing housing 120, which is beneficial to improving the stability of the fit between the rotating shaft 220 and the bearing 140, thereby improving the performance of the motor.

As shown in fig. 1 and 2, in any of the above embodiments, the rolling element 142 includes: ball rolling elements, tapered roller rolling elements or cylindrical rolling elements.

In this embodiment, according to different use requirements, one of a ball rolling element, a tapered roller rolling element, or a cylindrical rolling element may be adopted to ensure the stability of the fit between the shaft body and the rotating shaft 220.

In any of the above embodiments, as shown in fig. 1 and 2, the number of the reinforcing ribs 150 is at least three.

In this embodiment, the number of the reinforcing beads 150 is at least three, and the at least three reinforcing beads 150 are uniformly distributed along the circumferential direction of the bearing housing 120. When the number of the reinforcing ribs 150 is three, the bearing housing 120 has three supporting points, and at least three reinforcing ribs 150 can stably support the bearing housing 120 according to the triangular stabilizing principle.

By increasing the number of the reinforcing ribs 150, the coupling stability of the bearing housing 120 and the housing 100 can be improved. If the number of the reinforcing ribs 150 is too large, not only the material cost is wasted, but also the effect of increasing the stability is small, so that the number of the reinforcing ribs 150 can be set according to the stress condition of the bearing 140.

In any of the above embodiments, as shown in fig. 1 and 2, the number of rolling elements 142 is greater than the number of ribs 150.

In this embodiment, the number of the rolling elements 142 is greater than the number of the ribs 150, and when a force is transmitted between the rolling elements 142 and the ribs 150, the plurality of rolling elements 142 cannot transmit the force to the ribs 150 one by one, so that the plurality of rolling elements 142 transmit the force to the bearing housing 120 first, and the bearing housing 120 distributes the force to the plurality of ribs 150. Likewise, the plurality of rolling bodies 142 can also receive a uniform reaction force from the bearing housing 120. Therefore, the plurality of rolling elements 142 are subjected to reaction forces which are not in one-to-one correspondence, so that stress is dispersed, the phenomenon of stress concentration is avoided, and under the condition that the stress of the rolling elements 142 is dispersed, the bearing 140 runs more stably, and the friction torque in the running process of the motor can be reduced. In addition, the damage of the rolling elements 142 can be effectively reduced due to the stress dispersion, thereby improving the service life of the bearing 140.

In any of the above embodiments, as shown in fig. 1 and fig. 2, the length of the stiffener 150 is L1, the length of the bearing seat 120 is L2, and L1 is greater than or equal to 0.5 × L2 along the axial direction of the bearing 140.

In this embodiment, the reinforcing bars 150 support and reinforce the bearing housing 120, and the relative lengths of the reinforcing bars 150 and the bearing housing 120 have an effect on the support and reinforcement. The axial length of the bearing seat 120 is set to be L2, the axial length of the reinforcing rib 150 along the bearing seat 120 is set to be L1, and L1 and L2 satisfy that L1 is more than or equal to 0.5 xL 2, so that the length of the reinforcing rib 150 is more than or equal to half of the length of the bearing seat 120. The relative relation between the length of the reinforcing rib 150 and the length of the bearing seat 120 is limited to meet the above conditions, and the structural strength of the middle part of the bearing seat 120 is weak, so that the reinforcing rib 150 at least supports the middle part of the bearing seat 120, which is beneficial to improving the supporting and reinforcing effects on the bearing seat 120, and under the condition of stress of the bearing seat 120, the bearing seat 120 is not easy to break or break, thereby improving the structural stability of the bearing seat 120.

In any of the above embodiments, as shown in fig. 1 and 2, the straight line L extends in the radial direction of the bearing 140, and two reinforcing ribs 150 of the plurality of reinforcing ribs 150 pass through the straight line L.

In this embodiment, the straight line L extends in a radial direction of the bearing 140, and thus the straight line L passes through the axis of the bearing 140. The straight line L passes through two reinforcing ribs 150 of the plurality of reinforcing ribs 150, the two reinforcing ribs 150 passing through the straight line L are regarded as a group of reinforcing ribs 150, and the two reinforcing ribs 150 of the group of reinforcing ribs 150 are symmetrically arranged on both sides in the radial direction of the bearing housing 120. Illustratively, the number of the reinforcing ribs 150 is 6, and the central angle of two adjacent reinforcing ribs 150 is 60 degrees. Two reinforcing ribs 150 of the 6 reinforcing ribs 150 are symmetrically arranged.

Because two reinforcing ribs 150 in a set of reinforcing ribs 150 are symmetrically arranged relative to the bearing seat 120, the bearing seat 120 can be ensured to be stressed in a balanced manner, and the problem of stress concentration between the bearing 140 and the bearing seat 120 is not easy to occur, so that the damage rate of the bearing 140 can be further reduced, and the matching stability of the rotating shaft 220 and the bearing 140 can be improved.

In any of the above embodiments, as shown in fig. 1 and 2, the housing 100 includes: the casing 210, the cover 110, and the annular plate 160, the casing 210 is connected with the cover 110, the annular plate 160 is disposed on the cover 110, the annular plate 160 extends out of the circumferential edge of the cover 110, and a step 170 is formed between the annular plate 160 and the cover 110.

In this embodiment, the annular plate 160 is disposed at the circumferential outer edge of the cover 110, and the annular plate 160 protrudes from the circumferential outer edge of the cover 110 along the axial direction of the bearing 140, so that when the cover 110 is assembled with the casing 210 of the motor, the casing 210 of the motor can be inserted into the space surrounded by the annular plate 160, so as to facilitate the assembly of the cover 110 and the casing 210.

In one possible application, the annular plate 160 and the cover 110 are integrally formed, which is beneficial to reducing the processing difficulty.

Since the stepped portion 170 is formed between the annular plate 160 and the cover 110 and the stepped portion 170 is not filled with a material, the material cost can be reduced and the processing cost can be reduced.

In one possible application, the cover 110 is circular in radial cross-section along the bearing 140 so as to be stably engaged with the annular plate 160.

In any of the above embodiments, the housing 210 and the cover 110 are in an interference fit.

In any of the above embodiments, the stiffener 150 is integrally formed with the bearing housing 120 and/or the housing 100.

In this embodiment, the bearing seat 120 and/or the housing 100 and the stiffener 150 are integrally formed by injection molding, and the integral molding can reduce the amount of separate installation of the stiffener 150. In addition, the integral injection molding mode can also improve the structural strength, is favorable for improving the reinforcing effect of the reinforcing ribs 150 on the bearing seat 120 and the shell 100, and is favorable for improving the running stability of the motor.

In any of the above embodiments, as shown in fig. 1 and 2, the reinforcing ribs 150 are cut along the radial direction of the bearing 140, and the cross section of the reinforcing ribs 150 is triangular or right-angled trapezoidal.

In this embodiment, the reinforcing ribs 150 are radially cut along the axial direction, the cross section of the reinforcing ribs 150 is triangular, and by using the advantage of stability of the triangle, the reinforcing ribs 150 with the triangular cross section have a better reinforcing effect on the bearing seat 120 and the cover body 110, so as to improve the structural stability of the bearing seat 120, so that the bearing seat 120 can stably fix and limit the bearing 140, and thus the stability of torque transmission between the rotating shaft 220 and the bearing 140 can be improved.

The reinforcing rib 150 may be cut in the axial radial direction, or the cross section of the reinforcing rib 150 may be trapezoidal.

In other embodiments, the ribs 150 are taken radially in the axial direction, and the ribs 150 may also have a square, rectangular, etc. cross-section.

As shown in fig. 4, the present embodiment provides an electric power steering system 400, which includes the motor 300 in any of the above possible embodiments, so that the electric power steering system 400 provided by the present embodiment has all the advantages of the motor 300 provided by the above embodiments.

Among them, the Electric Power Steering system 400 (abbreviated as EPS) is an Electric Power Steering system that directly relies on the motor 300 to provide auxiliary torque Power, and compared with the conventional Hydraulic Power Steering system HPS (Hydraulic Power Steering), the EPS system has a simple structure and flexible assembly, and can save energy and protect the environment, and most of modern vehicles are basically equipped with EPS systems.

The electric power steering system 400 includes a variety of implementations. One of the many possible ways is specifically described below. Specifically, in one implementable manner, the EPS system has an electric power steering system and an assist torque mechanism that generates an assist torque. The assist torque assists a steering torque of the electric power steering system generated by the driver operating the steering wheel. The burden of the operation of the driver is reduced by the assist torque.

Specifically, the electric power steering system 400 includes a steering wheel 411, a steering shaft 412, a universal joint 413, a rotating shaft 414, a rack and pinion mechanism 415, a rack shaft 416, left and right steered wheels 417, and the like.

The assist torque mechanism specifically includes a steering torque sensor 421, an electronic control unit 422 for an automobile, a motor, a speed reduction mechanism 423, and the like. Specifically, the steering torque sensor 421 detects the steering torque of the electric power steering system. The control unit 422 generates a drive signal based on the detection signal of the steering torque sensor 421. The motor generates an assist torque corresponding to the steering torque in accordance with the drive signal. The motor transmits the generated assist torque to the electric power steering system via the speed reduction mechanism 423.

This embodiment proposes a vehicle including an electric power steering system as in the above embodiments, and therefore the present invention provides a vehicle having all the advantageous effects of the electric power steering system as provided in the above embodiments.

The vehicle can be a traditional fuel vehicle or a new energy vehicle. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. An electric machine, comprising:

a housing;

the bearing seat is arranged on the shell and provided with a bearing chamber;

the bearing is located in the bearing chamber, the bearing includes: a plurality of rolling bodies;

a rotor having a rotating shaft disposed along a central axis, the rotating shaft passing through the bearing;

a stator disposed in the housing, the stator being disposed radially opposite the rotor;

the reinforcing ribs are connected with the shell and the bearing seat and positioned at the joint of the shell and the bearing seat, and the number of the reinforcing ribs is different from that of the rolling bodies.

2. The electric machine of claim 1,

the reinforcing ribs are distributed at intervals along the circumferential direction of the bearing seat.

3. The electric machine of claim 1,

the reinforcing ribs are uniformly distributed along the circumferential direction of the bearing seat.

4. The electrical machine according to any one of claims 1 to 3,

the rolling body includes: ball rolling elements, tapered roller rolling elements or cylindrical rolling elements.

5. The electrical machine according to any one of claims 1 to 3,

the number of the reinforcing ribs is at least three.

6. The electrical machine according to any one of claims 1 to 3,

the number of the rolling bodies is larger than that of the reinforcing ribs.

7. The electric machine according to any of claims 1 to 3,

along the axial direction of the bearing, the length of the reinforcing rib is L1, the length of the bearing seat is L2, and L1 is more than or equal to 0.5 multiplied by L2.

8. The electrical machine according to any one of claims 1 to 3,

and setting a straight line L to extend along the radial direction of the bearing, wherein two reinforcing ribs in the plurality of reinforcing ribs pass through the straight line L.

9. The electrical machine according to any one of claims 1 to 3,

the housing includes:

the casing is connected with the cover body, the annular plate is arranged on the cover body and extends out of the circumferential outer edge of the cover body, and a step part is formed between the annular plate and the cover body.

10. The electric machine of claim 9,

the shell and the cover body are in interference fit.

11. The electrical machine according to any one of claims 1 to 3,

the reinforcing ribs are integrally formed on the bearing seat and/or the shell.

12. The electric machine according to any of claims 1 to 3,

the reinforcing ribs are cut along the radial direction of the bearing, and the cross sections of the reinforcing ribs are triangular or right-angled trapezoids.

13. An electric power steering system, characterized by comprising an electric motor according to any one of claims 1 to 12.

14. A vehicle characterized by comprising an electric power steering system according to claim 13.

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