Motor system, power assisting device and power assisting bicycle

Abstract

The utility model discloses a motor system, a power assisting device and a power assisting bicycle, and belongs to the technical field of motors. According to the motor system, the power assisting device and the power assisting bicycle, when the rotor rotates along the first direction, the one-way clutch is separated from the rotor, so that normal rotation of the rotor cannot be interfered, and the rotor can output power conveniently; when the rotor rotates in the second direction opposite to the first direction, due to the one-way motion characteristic of the one-way clutch, the one-way clutch is connected with the rotor, and then the rotor and the one-way clutch jointly overcome the damping torque of the damper to rotate in the second direction. According to the motor, the cogging torque generated when the rotor rotates in the second direction can be overcome through the damping torque generated by the damper, so that the rotor gear can be prevented from colliding with the input gear meshed with the rotor gear, and the problem of abnormal sound generated by the cogging torque of the motor is solved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor system, a power assist device, and a power-assisted bicycle. Background Technology

[0002] In electric-assist bicycles, the motor typically operates in a unidirectional drive mode when providing assistance, meaning the motor provides driving force to propel the bicycle forward. When the user pushes the bicycle backward, the rear wheel moves backward, causing the chain to drive the sprocket in reverse, which in turn drives the motor rotor in reverse through the gear transmission system of the assist device. Due to the presence of cogging torque in the motor, the gears will knock under no-load conditions during the backward movement, resulting in a noticeable "clicking" noise from the motor.

[0003] In existing technologies, the above problems are usually solved by reducing the cogging torque of the motor. Reducing the cogging torque is usually achieved by improving the assembly precision of the stator and rotor of the motor, or by screening and grading the rotor magnets to reduce the cogging torque. These methods sacrifice the manufacturability of the product. Utility Model Content

[0004] The purpose of this invention is to provide a motor system, an assist device, and an assist bicycle to solve the problem of abnormal noise caused by the cogging torque of the motor.

[0005] To achieve the above objectives, the following technical solution is provided:

[0006] The motor system includes:

[0007] The shell includes a shell body and a first cover, the shell body including a mounting cavity with an open end, and the first cover covering the open end;

[0008] A rotor, which is rotatably disposed within the mounting cavity; the rotor is capable of rotating along a first direction and a second direction, wherein the first direction is opposite to the second direction;

[0009] A one-way clutch is sleeved on the outside of the rotor. When the rotor rotates in the first direction, the one-way clutch disengages from the rotor; when the rotor rotates in the second direction, the one-way clutch engages with the rotor.

[0010] A damper is disposed on the housing body and abuts against the outer peripheral side of the one-way clutch.

[0011] As an improved technical scheme of the motor system, the shell body is provided with a damping limiting portion, and the motor system further comprises a first limiting assembly, the first limiting assembly comprises a first elastic member, the first elastic member is configured to provide a damping pre-tightening force along the axial direction of the rotor to the damper, so that the damper abuts against the damping limiting portion.

[0012] As an improved technical scheme of the motor system, the rotor is provided with a clutch limiting portion, and the first elastic member is further configured to provide a clutch pre-tightening force along the axial direction of the rotor to the one-way clutch, so that the one-way clutch abuts against the clutch limiting portion.

[0013] As an improved technical scheme of the motor system, the shell body is further provided with a first mounting limiting portion, and one end of the first elastic member abuts against the first mounting limiting portion along the axial direction of the rotor.

[0014] The first limiting assembly further comprises a limiting member, and the other end of the first elastic member abuts against one side of the limiting member along the axial direction of the rotor, and the one-way clutch and the damper both abut against the other side of the limiting member.

[0015] As an improved technical scheme of the motor system, the motor system further comprises a bearing, the bearing is sleeved outside one end of the rotor away from the one-way clutch, the inner ring of the bearing is in interference fit with the rotor, and the outer ring of the bearing is fixedly connected with the shell body.

[0016] As an improved technical scheme of the motor system, the motor system further comprises a second limiting assembly, the second limiting assembly comprises an elastic washer and a second elastic member, the elastic washer is clamped between the inner ring of the bearing and the shell body along the axial direction of the rotor, and the second elastic member is configured to provide a bearing pre-tightening force along the axial direction of the rotor to the outer ring of the bearing, so that the inner ring of the bearing abuts against the elastic washer.

[0017] As an improved technical scheme of the motor system, a limiting structure is arranged between the damper and the shell body, the limiting structure is used to prevent the damper from rotating along the circumferential direction of the rotor; and / or,

[0018] Along the axial direction of the rotor, a first design gap C1 is arranged between the one-way clutch and the limiting member, a second design gap C2 is arranged between the second elastic member and the outer ring of the bearing, and the axial play of the bearing is C3, and C1>C2+C3.

[0019] As a preferred technical scheme of the motor system, the damper provides a damping torque T1 to the one-way clutch, the bearing provides a friction resistance torque T2 to the rotor, and the motor system has a cogging torque T3, and T1+T2>T3.

[0020] As a preferred technical scheme of the motor system, the surface of the damper abutting against the one-way clutch is provided with a storage structure, and the storage structure is provided with a lubricating medium.

[0021] To achieve the above object, the utility model provides a power assisting device, including transmission system and as any above motor system, transmission system is connected with the rotor transmission.

[0022] To achieve the above object, the utility model provides a power assisting bicycle, including the power assisting device above.

[0023] Compared with the prior art, the utility model has the advantages of:

[0024] The motor system, the power assisting device and the power assisting bicycle have the advantages that when the rotor rotates in the first direction, the one-way clutch is separated from the rotor, so as not to interfere with the normal rotation of the rotor, so that the rotor can output power; when the rotor rotates in the second direction opposite to the first direction, the one-way clutch is engaged with the rotor due to the one-way movement characteristic of the one-way clutch, so that the rotor and the one-way clutch rotate in the second direction together to overcome the damping torque of the damper, in other words, the damping torque generated by the damper can overcome the cogging torque generated when the rotor rotates in the second direction, so that the rotor gear and the input gear engaged with the rotor gear can be prevented from colliding, thereby solving the problem of abnormal sound caused by the cogging torque of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the power assisting device in the embodiment of the utility model;

[0026] Figure 2 It is a sectional view of the power assisting device in the embodiment of the utility model;

[0027] Figure 3 It is an enlarged view of A in Figure 2

[0028] Figure 4 It is an enlarged view of B in Figure 2

[0029] Figure 5 It is a structural schematic view of the one-way clutch in the embodiment of the utility model;

[0030] Figure 6 It is a structural schematic view of the limiting piece in the embodiment of the utility model; ​​

[0031] Figure 7 It is a structure schematic view of the damper in the embodiment of the utility model.

[0032] Figure 8 It is a structure schematic view of the elastic washer in the embodiment of the utility model.

[0033] Reference signs:

[0034] 100, motor system; 200, transmission system; 201, input shaft; 202, input gear; 1, shell; 1a, shell body; 1b, first cover body; 1c, second cover body; 11, damping limiting part; 12, first installation limiting part; 13, second installation limiting part; 2, rotor; 21, rotor gear; 22, clutch limiting part; 3, one-way clutch; 4, damper; 41, protrusion; 42, storage groove; 5, first limiting assembly; 51, first elastic piece; 52, limiting piece; 521, damping limiting matching part; 522, clutch limiting matching part; 6, bearing; 7, second limiting assembly; 71, elastic washer; 72, second elastic piece. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0037] It should be noted that: similar reference signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the utility model, it needs to explain, the term "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, or it is the orientation or position relation that the utility model product uses usually, only is for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, constructs and operates with a particular orientation, therefore can not be understood as the limitation to the utility model. In addition, the term "first", "second", "third" and so on are only used for distinguishing description, and can not be understood as indicating or implying relative importance. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0039] In the description of the utility model, it also needs to explain that, unless otherwise specified and limited, the term "set", "connect" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, or electrically connected. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0040] In the utility model, unless otherwise specified and limited, the "upper" or "lower" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature in the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and can not be understood as the limitation of the utility model.

[0042] As Figures 1-8As shown, the embodiment provides a motor system, a power-assisted device and a power-assisted bicycle. The power-assisted bicycle comprises the power-assisted device, the power-assisted device comprises the motor system 100 and a transmission system 200. The motor system 100 comprises a housing 1 and a rotor 2. The housing 1 comprises a housing main body 1a and a first cover 1b. The housing main body 1a comprises an installation cavity with one end being open, and the first cover 1b covers the opening. The rotor 2 is rotatably arranged in the installation cavity. The rotor 2 can rotate in a first direction and a second direction respectively, and the first direction is opposite to the second direction. The transmission system 200 is in transmission connection with the rotor 2.

[0043] It should be noted that in the embodiment, the housing main body 1a comprises a main body part and a second cover 1c, and the main body part and the second cover 1c are arranged separately and fixedly connected, that is, the installation cavity has a structure with both ends being open, the first cover 1b covers the opening at one end of the installation cavity, and the second cover 1c covers the opening at the other end of the installation cavity. Exemplarily, the first cover 1b is fixedly connected with the housing main body 1a by bolts or other locking members, and the second cover 1c is threadedly connected with the housing main body 1a, which is convenient for assembly. Of course, in other embodiments, the housing main body 1a can also have an integrated structure.

[0044] In the embodiment, the transmission system 200 comprises an input shaft 201 provided with an input gear 202, and the rotor 2 is provided with a rotor gear 21, and the rotor gear 21 is in meshing connection with the input gear 202.

[0045] The rotor 2 serves as a power source of the motor system 100, and the power is transmitted to the input gear 202 through the meshing connection between the rotor gear 21 and the input gear 202. The transmission system 200 and the motor system 100 are in transmission connection through the meshing connection of gears, which has higher transmission precision and is also beneficial to reducing the noise generated by transmission. Further, the transmission system 200 is a gear transmission mechanism, which can be a one-stage or multi-stage gear transmission, which is not limited herein.

[0046] In other embodiments, the input shaft 201 and the rotor 2 can also be in transmission connection through a belt transmission assembly or a chain transmission assembly in the prior art, which is not limited herein.

[0047] The motor system 100 further comprises a one-way clutch 3 and a damper 4. The one-way clutch 3 is sleeved on the outer side of the rotor 2. When the rotor 2 rotates in the first direction, the one-way clutch 3 is separated from the rotor 2. When the rotor 2 rotates in the second direction, the one-way clutch 3 is engaged with the rotor 2. The damper 4 is arranged on the housing main body 1a, and the damper 4 abuts against the outer circumferential side of the one-way clutch 3.

[0048] When the rotor 2 rotates in the first direction, the one-way clutch 3 is separated from the rotor 2, and thus does not interfere with the normal rotation of the rotor 2, so that the rotor 2 outputs power; when the rotor 2 rotates in the second direction opposite to the first direction, due to the one-way motion characteristic of the one-way clutch 3, the one-way clutch 3 is engaged with the rotor 2, so that the one-way clutch 3 rotates synchronously with the rotor 2, at this time, the damper 4 abuts against the outer circumferential side of the one-way clutch 3, and the one-way clutch 3 can be provided with a damping torque by the damper 4, and the rotor 2 and the one-way clutch 3 can rotate together in the second direction to overcome the damping torque of the damper 4, that is, the gear slot torque generated when the rotor 2 rotates in the second direction can be overcome by the damping torque, thereby avoiding the impact between the rotor gear 21 and the input gear 202, and solving the abnormal noise problem caused by the gear slot torque of the motor.

[0049] It should be noted that when the motor system 100 is not working or the rotor 2 rotates in the first direction, there can be a small gap between the damper 4 and the outer circumferential side of the one-way clutch 3, that is, the damper 4 does not contact the outer circumferential side of the one-way clutch 3, and only when the one-way clutch 3 is engaged with the rotor 2, the damper 4 abuts against the outer circumferential side of the one-way clutch 3 to provide the damping torque.

[0050] Exemplarily, the one-way clutch 3 is a one-way needle clutch. It should be noted that the structure and working principle of the one-way clutch 3 are both prior art, which will not be described here.

[0051] Optionally, the shell body 1a is provided with a damping limiting portion 11, and the motor system 100 further comprises a first limiting assembly 5, the first limiting assembly 5 comprising a first elastic member 51 configured to provide a damping pre-tightening force along the axial direction of the rotor 2 to the damper 4, so that the damper 4 abuts against the damping limiting portion 11. The position of the damper 4 along the axial direction of the rotor 2 is limited by the damping limiting portion 11 and the first elastic member 51, which not only ensures the stability of the installation of the damper 4, but also improves the stability of the damper 4 during operation, and is also conducive to reducing the vibration noise generated during the operation of the motor system 100, and on the other hand, facilitates the assembly of the damper 4.

[0052] Optionally, the rotor 2 is provided with a clutch limiting portion 22, and the first elastic member 51 is further configured to provide a clutch pre-tightening force along the axial direction of the rotor 2 to the one-way clutch 3, so that the one-way clutch 3 abuts against the clutch limiting portion 22. The position of the one-way clutch 3 along the axial direction of the rotor 2 is limited by the clutch limiting portion 22 and the first elastic member 51, which not only ensures the stability of the installation of the one-way clutch 3, but also improves the stability of the one-way clutch 3 during operation, and is also conducive to reducing the vibration noise generated during the operation of the motor system 100, and on the other hand, facilitates the assembly of the one-way clutch 3.

[0053] In this embodiment, the shell body 1a is further provided with a first installation limiting part 12, and one end of the first elastic member 51 abuts against the first installation limiting part 12 along the axial direction of the rotor 2; the first limiting assembly 5 further includes a limiting member 52, and the other end of the first elastic member 51 abuts against one side of the limiting member 52 along the axial direction of the rotor 2, and the one-way clutch 3 and the damper 4 both abut against the other side of the limiting member 52. The elastic force generated by the first elastic member 51 is transmitted to the one-way clutch 3 and the damper 4 through the limiting member 52, in other words, the axial movement of the one-way clutch 3 and the damper 4 along the rotor 2 is simultaneously limited through the limiting member 52, which facilitates assembly and is conducive to improving the stress stability of the one-way clutch 3 and the damper 4.

[0054] Exemplarily, the first elastic member 51 is a circlip. In other embodiments, the first elastic member 51 can also be a compression spring or other elastic structure, which is not limited here.

[0055] In this embodiment, specifically, the limiting member 52 includes a damping limiting fitting part 521 and a clutch limiting fitting part 522, and both the damping limiting fitting part 521 and the clutch limiting fitting part 522 are arranged on the side of the limiting member 52 away from the first elastic member 51 along the axial direction of the rotor 2, and the two ends of the damper 4 respectively abut against the damping limiting fitting part 521 and the damping limiting part 11, and the two ends of the one-way clutch 3 respectively abut against the clutch limiting fitting part 522 and the clutch limiting part 22.

[0056] It should be noted that the damper 4 has a certain elasticity, in other words, the damper 4 can produce elastic deformation. Exemplarily, the damper 4 is made of an elastic material, such as rubber or the like.

[0057] After the first elastic member 51 is installed in place, the first elastic member 51 will press the limiting member 52 tightly, and the limiting member 52 will press the damper 4 tightly, that is, the first elastic member 51, the limiting member 52 and the damper 4 will not move along the axial direction of the rotor 2.

[0058] Optionally, a first gap C is arranged between the one-way clutch 3 and the limiting member 52 along the axial direction of the rotor 2. It should be noted that after the motor system 100 is installed, the one-way clutch 3 and the limiting member 52 have the first gap C along the axial direction of the rotor 2, so that the one-way clutch 3 has a certain floating gap in the axial direction of the rotor 2, so that the one-way clutch 3 will not be stressed in the axial direction of the rotor 2, so as to improve the one-way clutch effect of the one-way clutch 3. Specifically, the first gap C is located between the one-way clutch 3 and the clutch limiting fitting part 522 along the axial direction of the rotor 2.

[0059] Optionally, the damper 4 is annular, and an inner circumferential wall of the damper 4 is tightly attached to an outer circumferential wall of the one-way clutch 3, thereby facilitating an increase in a contact area between the damper 4 and the one-way clutch 3, facilitating an improvement in consistency of the damping torque, and prolonging a service life of the damper 4 and the one-way clutch 3.

[0060] Optionally, a limiting structure is arranged between the damper 4 and the shell body 1a, and the limiting structure is used to prevent the damper 4 from rotating in a circumferential direction of the rotor 2, thereby further improving installation stability of the damper 4.

[0061] Specifically, the limiting structure includes a protrusion 41 arranged on an outer circumferential surface of the annular damper 4 and a limiting groove arranged on an inner wall of the mounting cavity, and the protrusion 41 is inserted into the limiting groove to prevent the damper 4 from rotating in the circumferential direction of the rotor 2, and the structure is simple, has high manufacturability, and facilitates assembly of the damper 4. Of course, the protrusion 41 can also be arranged on the inner wall of the mounting cavity, and the limiting groove can be arranged on the outer circumferential surface of the damper 4.

[0062] Optionally, the limiting structure can be one, two, three, or more, which is not limited herein.

[0063] Optionally, when multiple limiting structures are arranged, the multiple limiting structures are arranged at equal intervals in the circumferential direction of the damper 4, thereby improving force uniformity of the damper 4 and facilitating prolongation of a service life of the damper 4.

[0064] Optionally, a storage structure is arranged on a surface where the damper 4 and the one-way clutch 3 abut against each other, and a lubricating medium is arranged in the storage structure, thereby greatly reducing frictional heat loss generated when the one-way clutch 3 rotates with the rotor 2, reducing wear of an inner ring of the damper 4 and an outer ring of the one-way clutch 3, and prolonging a service life of the inner ring of the damper 4 and the outer ring of the one-way clutch 3.

[0065] Specifically, the storage structure is a storage groove 42 arranged on an inner circumferential surface of the annular damper 4. Optionally, the storage groove 42 can be one, two, three, or more, which is not limited herein. When multiple storage grooves 42 are arranged, the multiple storage grooves 42 are arranged at equal intervals in the circumferential direction of the damper 4, thereby achieving better lubrication.

[0066] Illustratively, the lubricating medium is lubricating oil, which has good lubrication and is not prone to leakage.

[0067] Optionally, the motor system 100 further includes a bearing 6, the bearing 6 is sleeved on an outer side of an end of the rotor 2 away from the one-way clutch 3, an inner ring of the bearing 6 is in interference fit with the rotor 2, and an outer ring of the bearing 6 is fixedly connected with the shell body 1a, so as to support the rotor 2 through the bearing 6 and improve fluency and stability of rotation of the rotor 2. Specifically, the outer ring of the bearing 6 is fixedly connected with the second cover body 1c.

[0068] Further, when the rotor gear 21 is a helical gear, the bearing 6 also needs to bear the axial force generated by the helical gear.

[0069] Exemplarily, the bearing 6 is a deep groove ball bearing. In other embodiments, the bearing 6 can also adopt other types of bearings 6, which are not limited herein.

[0070] Optionally, the motor system 100 further comprises a second limiting assembly 7, which comprises an elastic washer 71 and a second elastic member 72. The elastic washer 71 is clamped between the inner ring of the bearing 6 and the shell main body la along the axial direction of the rotor 2, and the second elastic member 72 is configured to provide the bearing 6 pre-tightening force along the axial direction of the rotor 2 to the outer ring of the bearing 6, so that the inner ring of the bearing 6 abuts against the elastic washer 71. Specifically, the elastic washer 71 is clamped between the inner ring of the bearing 6 and the second cover body lc.

[0071] Specifically, the second cover body lc is provided with a mounting groove, and the bearing 6 is arranged in the mounting groove; the outer ring of the bearing 6 is in clearance fit with the inner circumferential wall of the mounting groove, and the movement of the outer ring of the bearing 6 along the axial direction of the rotor 2 is limited by the second elastic member 72, facilitating the assembly of the bearing 6. Since there is an axial play between the inner ring and the outer ring of the bearing 6, after the second elastic member 72 is installed in place, the elastic washer 71 is compressed, and the elastic washer 71 will exert an axial pre-tightening force on the inner ring of the bearing 6, so that the axial play between the inner ring and the outer ring of the bearing 6 is eliminated, the rotation accuracy of the bearing 6 is improved, and the rotation vibration and noise are reduced.

[0072] Exemplarily, the elastic washer 71 is a wave washer. In other embodiments, the elastic washer 71 can also be other washers capable of producing elastic deformation, which are not limited herein.

[0073] Exemplarily, the second elastic member 72 is a circlip. In other embodiments, the second elastic member 72 can also be a compression spring or other elastic structure, which is not limited herein.

[0074] Specifically, the second cover body lc is also provided with a second installation limiting portion 13, and one end of the second elastic member 72 abuts against the second installation limiting portion 13 and the other end abuts against the outer ring of the bearing 6 along the axial direction of the rotor 2.

[0075] Since the inner ring of the bearing 6 is in interference fit with the rotor 2, the axial pre-tightening force generated by the elastic washer 71 also acts on the rotor 2 when acting on the inner ring of the bearing 6, so that the axial play of the bearing 6 and the gap between the second elastic member 72 and the second installation limiting portion 13 are all eliminated.

[0076] It should be noted that, in order to facilitate assembly, a first design gap C1 is reserved between the one-way clutch 3 and the limiting piece 52 in the axial direction of the rotor 2, a second design gap C2 is reserved between the second elastic member 72 and the outer ring of the bearing 6, in order to facilitate description, the axial clearance of the bearing 6 is C3, then C1>C2+C3, and then the first gap C between the one-way clutch 3 and the limiting piece 52 is formed after the motor system 100 is assembled.

[0077] Optionally, the damping torque provided by the damper 4 to the one-way clutch 3 is T1, the friction resistance torque provided by the bearing 6 to the rotor 2 is T2, and the gear slot torque of the motor system 100 is T3, T1+T2>T3. In this way, the effect of solving the problem of abnormal sound caused by the gear slot torque and the gear backlash of the motor can be improved, and the user's riding experience can be improved.

[0078] It should be noted that in the existing power-assisted bicycle power-assisted device, due to the tooth shape, helix and tooth pitch of the gear and other deviations, as well as the control error of the motor, vibrations in various directions will be generated during the operation of the motor. In the prior art, the electromagnetic force fluctuation is usually optimized to reduce the vibration noise generated during the operation of the motor system, but it is difficult to avoid affecting or sacrificing the performance of the motor system such as output and efficiency, and perfect compatibility of multiple performances cannot be achieved.

[0079] The motor system 100 of the embodiment can solve the problem of noise caused by vibration during operation of the motor system 100, and will not affect or sacrifice the performance of the motor system 100 such as output and efficiency.

[0080] Exemplarily, the working process of the motor system 100 of the embodiment is as follows:

[0081] When the motor system 100 normally assists operation, the rotor 2 rotates in the first direction to output power, the rotor 2 is pressed tightly by the one-way roller clutch and the inner ring of the damper 4 under the action of the radial force of the input gear 202, and the retainer of the one-way roller clutch and the outer ring of the damper 4 are stationary. The outer diameter of the rotor 2 is separated from the roller of the one-way roller clutch, so that the rotor 2 can smoothly transmit power to the input gear 202, and the input gear 202 transmits power through the gear transmission mechanism to achieve the effect of assistance.

[0082] When the user pushes the bicycle backwards, the rear wheel of the bicycle reverses, and the chain wheel and the chain are reversed, and the sprocket is reversed, and the rotor 2 is reversed (i.e. the rotor 2 rotates in the second direction) through the gear transmission mechanism. When the bicycle is reversed, the input gear 202 rotates in the first direction, the rotor 2 rotates in the second direction, and the radial force of the input gear 202 applied to the rotor 2 is small at this time. Due to the one-way movement characteristics of the one-way roller clutch, the outer diameter of the rotor 2 is in interference fit with the roller of the one-way roller clutch, that is, the rotor 2 is engaged with the one-way roller clutch, and the rotor 2 and the one-way roller clutch rotate together in the second direction to overcome the damping torque of the damper 4.

[0083] It should be noted that when designing, the damping torque T1 provided by the damper 4 to the one-way clutch 3 and the friction resistance torque T2 provided by the bearing 6 to the rotor 2 are greater than the cogging torque T3 of the motor system 100, that is, T1+T2>T3, so as to achieve the purpose of eliminating the "click" abnormal sound of the motor system 100 when the bicycle is reversed.

[0084] It should be noted that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An electric motor system, characterized by, The motor system (100) comprises: a housing (1) comprising a housing body (1a) and a first cover (1b), the housing body (1a) comprising an open-ended mounting cavity, and the first cover (1b) covering the opening; a rotor (2) rotatably arranged in the mounting cavity, the rotor (2) being capable of rotating in a first direction and a second direction respectively, the first direction being opposite to the second direction; a one-way clutch (3) arranged on the outer side of the rotor (2), the one-way clutch (3) being separated from the rotor (2) when the rotor (2) rotates in the first direction, and the one-way clutch (3) being engaged with the rotor (2) when the rotor (2) rotates in the second direction; a damper (4) arranged on the housing body (1a), the damper (4) abutting the outer circumferential side of the one-way clutch (3).

2. The electric machine system of claim 1, wherein, The housing body (1a) is provided with a damping limiting portion (11), and the motor system (100) further comprises a first limiting assembly (5), the first limiting assembly (5) comprising a first elastic member (51) configured to provide a damping pre-tightening force along the axial direction of the rotor (2) to the damper (4) so that the damper (4) abuts the damping limiting portion (11).

3. The electric machine system of claim 2, wherein, The rotor (2) is provided with a clutch limiting portion (22), and the first elastic member (51) is further configured to provide a clutch pre-tightening force along the axial direction of the rotor (2) to the one-way clutch (3) so that the one-way clutch (3) abuts the clutch limiting portion (22).

4. The electric machine system of claim 3, wherein, The housing body (1a) is further provided with a first mounting limiting portion (12), and one end of the first elastic member (51) abuts the first mounting limiting portion (12) along the axial direction of the rotor (2). The first limiting assembly (5) further comprises a limiting member (52), and the other end of the first elastic member (51) abuts one side of the limiting member (52) along the axial direction of the rotor (2), and the one-way clutch (3) and the damper (4) both abut the other side of the limiting member (52).

5. The electric machine system of claim 4, wherein, The motor system (100) further comprises a bearing (6) arranged on the outer side of one end of the rotor (2) away from the one-way clutch (3), the inner ring of the bearing (6) is in interference fit with the rotor (2), and the outer ring of the bearing (6) is fixedly connected with the housing body (1a).

6. The electric machine system of claim 5, wherein, The motor system (100) further comprises a second limiting assembly (7), the second limiting assembly (7) comprising an elastic washer (71) and a second elastic member (72), the elastic washer (71) being arranged between the inner ring of the bearing (6) and the housing body (1a) along the axial direction of the rotor (2), and the second elastic member (72) being configured to provide a bearing pre-tightening force along the axial direction of the rotor (2) to the outer ring of the bearing (6) so that the inner ring of the bearing (6) abuts the elastic washer (71).

7. The electric machine system of claim 6, wherein, The damper (4) is provided with a limiting structure between the shell body (1a), the limiting structure is used for preventing the damper (4) from rotating along the circumference of the rotor (2); and / or, Along the axial direction of the rotor (2), a first design gap C1 is provided between the one-way clutch (3) and the limiting piece (52), a second design gap C2 is provided between the second elastic piece (72) and the outer ring of the bearing (6), and the axial clearance of the bearing (6) is C3, then C1>C2+C3.

8. The electric machine system of claim 5, wherein, The damper (4) provides a damping torque T1 to the one-way clutch (3), the bearing (6) provides a friction resistance torque T2 to the rotor (2), and the gear slot torque of the motor system (100) is T3, T1+T2>T3.

9. The electric machine system of any of claims 1-8, wherein, The surface of the damper (4) and the one-way clutch (3) is provided with a storage structure, and the storage structure is provided with a lubricating medium.

10. An assisting device, characterized in that The motor system (100) comprises a transmission system (200) and the motor system (100) according to any one of claims 1-9, and the transmission system (200) is in transmission connection with the rotor (2).

11. A power assisted bicycle characterised in that, The power-assisted device comprises the motor system (100) according to claim 10.

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