Clutch, hub motor and vehicle

Abstract

The utility model relates to the technical field of clutches, in particular to a clutch, a hub motor and a vehicle. The clutch comprises an inner ring and an outer ring arranged on the outer side of the inner ring in a sleeving mode, a second clutch assembly is arranged between the inner ring and the outer ring, the outer ring can be fixed relative to the inner ring or rotate around a rotating shaft in a one-way mode, the second clutch assembly is in linkage with a control device, and the control device controls the second clutch assembly to enable the inner ring and the outer ring to be connected or separated. According to the clutch, the second clutch assembly is arranged and controlled by the control device, so that the clutch has a connection or disconnection function, the hub motor has a power generation mode, a rider can charge a battery in the mode when the electric quantity is low, and the electric quantity of the rider is low. Or the mode is used for increasing the resistance so as to enhance the exercise intensity.

Description

Technical Field

[0001] The utility model relates to the technical field of clutches, and in particular to a clutch, a wheel hub motor and a vehicle. Background Art

[0002] A one-way clutch is a mechanical device that controls the direction of power transfer. It allows power to be transferred in one direction only and not the other. When the input shaft is rotating, the one-way clutch allows the output shaft to rotate freely. However, when the input shaft stops or rotates in the opposite direction, the one-way clutch prevents the output shaft from rotating. This device is commonly used in various mechanical systems, such as bicycles, engines, and transmission systems.

[0003] Chinese patent document CN220015875U discloses a clutch, a hub motor and a vehicle. The clutch has a plurality of clutch rollers between a clutch inner ring and a clutch outer ring to realize a clutch function. The clutch rollers are automatically controlled and cannot be manually operated when used on a hub motor, which makes the hub motor have no power generation mode.

[0004] Therefore, the existing technology needs to be improved and developed. Utility Model Content

[0005] The purpose of the present application is to provide a clutch, a hub motor and a vehicle. By setting a second clutch assembly and controlling it using a control device, the clutch has an engagement or disengagement function, thereby enabling the hub motor to have a power generation mode.

[0006] In order to solve the above technical problems, the present application provides a clutch, including an inner ring and an outer ring sleeved on the outside of the inner ring, a second clutch assembly is arranged between the inner ring and the outer ring, the outer ring can be fixed relative to the inner ring or rotate unidirectionally around the rotation axis, the second clutch assembly and the control device are linked, and the control device controls the second clutch assembly to make the inner ring and the outer ring engage or disengage.

[0007] Further, the second clutch assembly includes a pawl and an elastic member, the pawl is rotatably arranged on the outer ring, the inner ring is provided with a locking groove, the inner ring and the outer ring are engaged when the pawl abuts against the locking groove, and the inner ring and the outer ring are separated when the pawl does not abut against the locking groove, and the elastic member acts on the pawl to keep the pawl abutting against the locking groove.

[0008] Furthermore, the control device includes a first gear, a second gear, a third gear and a driving device that are meshed in sequence, the output shaft of the driving device is connected to the first gear, the third gear is provided with a conical surface, and the driving device drives the third gear to spirally move, and drives the pawl to open or retract through the conical surface.

[0009] Furthermore, the control device is provided with a signal feedback module, which includes a magnet arranged on the third gear and a Hall element arranged on a circuit board. The Hall element senses the magnetic field strength of the magnet installed on the third gear to obtain a pulse signal to determine the engagement signal or separation signal of the pawl.

[0010] Furthermore, it also includes a partition, which is fixedly connected to the outer ring and isolates the outer ring from other adjacent components.

[0011] Further, a first clutch assembly is further provided between the inner ring and the outer ring, the first clutch assembly comprising a rolling element and a spring, the inner wall of the outer ring is provided with a raceway, the spring is provided in the raceway, one end of the spring abuts against the rolling element, one end of the spring abuts against the side wall of the raceway, the rolling element is movably provided in the raceway, and the raceway has a first receiving groove and a second receiving groove;

[0012] When the rolling element moves into the first receiving groove, the outer ring, the inner ring, and the rolling element engage, and the outer ring is fixed relative to the inner ring;

[0013] When the rolling element moves into the second accommodating groove, the outer ring, the inner ring and the rolling element are separated, and the outer ring rotates unidirectionally around the rotation axis relative to the inner ring.

[0014] Furthermore, the outer ring is provided with a planetary shaft, and the axial direction of the planetary shaft is parallel to the direction of the rotation axis.

[0015] The present application also provides a hub motor, comprising the above-mentioned clutch, and also comprising a core shaft, an input member and an output member, wherein the input member is fixedly mounted on the output member, the output member is rotatably disposed on the core shaft, a motor module is disposed in the output member, the motor module comprises a motor assembly and a reduction mechanism, the motor assembly, the reduction mechanism and the output member are connected in sequence, the motor module is used to output torque to the output member, the clutch is disposed between the reduction mechanism and the output member, and when the control device controls the second clutch assembly to engage the inner ring and the outer ring, the motor module switches to a power generation mode.

[0016] Further, the reduction mechanism comprises a sun gear, a ring gear, a planetary gear and a planet carrier, the planet carrier and the clutch are arranged as a whole, the planetary gear is rotatably mounted on the planetary shaft of the clutch, the sun gear is externally meshed with the planetary gear, the planetary gear is internally meshed with the ring gear, the ring gear is fixedly connected to the output member, and the motor assembly is connected to the sun gear;

[0017] When the motor assembly generates torque and inputs it into the sun gear, the outer ring is fixed relative to the inner ring, and the torque is output to the output member through the ring gear;

[0018] When the motor assembly stops generating torque and the output member rotates, the outer ring rotates unidirectionally relative to the inner ring around the rotation axis, and the rotation of the output member does not drive the sun gear to rotate.

[0019] The present application also provides a vehicle, comprising the above-mentioned wheel hub motor.

[0020] From the above, it can be seen that the clutch of the present application has the function of engagement or disengagement by setting a second clutch assembly and using a control device to control it, so that the hub motor has a power generation mode. The rider can use this mode to charge the battery when the power is low, or use this mode to increase resistance and enhance exercise intensity.

[0021] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional diagram of the hub motor.

[0023] Figure 2 This is a longitudinal section of the hub motor.

[0024] Figure 3 This is an exploded diagram of the hub motor.

[0025] Figure 4 A three-dimensional diagram of the clutch.

[0026] Figure 5 This is a stereoscopic view of the clutch from another angle.

[0027] Figure 6 This is the front view of the clutch (engaged state).

[0028] Figure 7 This is the front view of the clutch (disengaged state).

[0029] Figure 8 This is the rear view of the clutch (engaged state).

[0030] Fig. 9 This is the rear view of the clutch (disengaged state).

[0031] Fig.10 A three-dimensional diagram of the pawl.

[0032] Fig.11 Exploded view of the control device.

[0033] Fig.12 This is an exploded view of the control device from another angle.

[0034] Description of labels:

[0035] 1-input member, 2-output member, 3-first end cover, 4-second end cover, 5-core shaft, 6-motor assembly, 61-stator, 62-rotor, 7-reduction mechanism, 71-sun gear, 72-ring gear, 73-planetary gear,

[0036] 8-clutch, 81-outer ring, 811-bushing, 812-raceway, 8121-first accommodating groove, 8122-second accommodating groove, 813-movable groove, 82-inner ring, 821-cylindrical section, 822-ratchet section, 8221-locking groove, 823-first threaded section, 83-first clutch assembly, 831-spring, 832-rolling element, 84-second clutch assembly, 841-pawl, 8411-rotating shaft portion, 8412-controlled portion, 8413-locking portion, 85-partition plate, 86-planetary shaft, 87-fixed plate,

[0037] 9-control device, 91-control box, 92-cover plate, 93-driving device, 94-first gear, 95-second gear, 96-third gear, 961-magnet, 962-conical surface, 963-second thread segment, 97-circuit board, 98-Hall element. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0043] Figure 1 This is a three-dimensional diagram of the hub motor. Figure 2 This is a longitudinal section of the hub motor. Figure 3 It is an exploded view of the wheel hub motor (the motor assembly 6, input member 1, and output member 2 are hidden). The present application provides a wheel hub motor applied to a vehicle, and the vehicle may be an electric-assisted bicycle, an electric vehicle, an electric motorcycle, a cargo-carrying electric vehicle, an electric scooter, etc. The wheel hub motor is installed at the rear wheel position of the vehicle and is connected to the wheel rim through spokes, so as to output torque to the rear wheel and drive the vehicle to move forward. In this embodiment, the wheel hub motor includes a spindle 5, an input member 1, and an output member 2. The spindle 5 is inserted into the slot of the vehicle frame, and the threads at both ends of the spindle 5 are respectively fastened by two nuts to fix the spindle 5 to the frame. The first end cover 3 and the second end cover 4 are installed on both sides of the output member 2, and the input member 1 is fixedly installed on the second end cover 4, so that the input member 1 is indirectly fixed to the output member 2. Bearings are installed on the inner sides of both ends of the output member 2. The output member 2 is assembled with the spindle 5 so that the output member 2 can rotate relative to the spindle 5, and a motor module is installed inside the output member 2. The motor module is connected to the battery through a cable, and the motor module is both a motor and a generator. When used as a motor, the motor converts electrical energy into kinetic energy and outputs torque to the output member 2 . When used as a generator, the motor converts the kinetic energy of the vehicle into electrical energy and stores it in the battery.

[0044] The motor module includes a motor assembly 6 and a speed reduction mechanism 7. The motor assembly 6 is usually a high-speed motor, which needs to be converted from high-speed and low-torque to low-speed and high-torque through the speed reduction mechanism 7 to efficiently drive the vehicle forward. In this embodiment, the motor assembly 6 is an outer rotor 62 motor, including a stator 61 and a rotor 62. The stator 61 is fixedly arranged on the core shaft 5, and the rotor 62 is rotatably arranged outside the stator 61.

[0045] The speed reduction mechanism 7 is a planetary gear 73 speed reduction mechanism 7, specifically including a sun gear 71, a ring gear 72, a planetary gear 73 and a planet carrier, the planet carrier is fixedly supported on the spindle 5, the planetary gear 73 is hinged on the planet carrier, the sun gear 71 is externally meshed with the planetary gear 73, the planetary gear 73 is internally meshed with the ring gear 72, and the ring gear 72 is fixedly connected to the inner wall of the output member 2. The rotor 62 of the motor assembly 6 is connected to the sun gear 71. When the motor assembly 6 is working, the planet carrier is fixed, and the torque generated by the motor assembly 6 is input from the sun gear 71 and output from the ring gear 72.

[0046] There are four modes of hub motors. The first is the pure electric drive mode, which means that the motor module outputs torque as an electric motor; the second is the human-powered drive mode, which means that only the input part 1 inputs torque and then transmits it to the output part 2 to output torque, and it does not have a speed change function; the third is the hybrid mode, which means that the first mode and the second mode exist at the same time; the fourth is the power generation mode, which means that the motor module acts as a generator, and the torque generated by the rider's pedaling is input into the motor module, converting the vehicle's kinetic energy into electrical energy, which is then stored in the battery.

[0047] In order to realize the power generation mode of the wheel hub motor, the wheel hub motor needs to have the function of manually controlling the clutch 8 to engage and disengage. The second clutch assembly 84 is arranged between the inner ring 82 and the outer ring 81, and the second clutch assembly 84 is controlled by the control device 9 to engage or disengage the inner ring 82 and the outer ring 81. When the inner ring 82 and the outer ring 81 are engaged, the rider is in the normal riding process of the vehicle or the vehicle is gliding. The clutch 8 is equivalent to the planetary carrier, and the inner ring 82, the outer ring 81 and the core shaft 5 are fixed, that is, the planetary carrier is fixed, and the rotation of the output member 2 will drive the sun gear 71 and the rotor 62 to rotate, and the motor module is switched to a generator; when the inner ring 82 and the outer ring 81 are separated, the outer ring 81 can rotate unidirectionally around the rotation axis relative to the inner ring 82, and the kinetic energy of the output member 2 will not be transmitted to the sun gear 71 and the rotor 62, and there is no dragging feeling during the gliding process.

[0048] By setting up the second clutch assembly 84 and using the control device 9 to control it, the clutch 8 has the function of engaging or disengaging, so that the hub motor has a power generation mode. The rider can use this mode to charge the battery when the power is low, or use this mode to increase the resistance and thus enhance the intensity of exercise.

[0049] Figure 4 It is a three-dimensional diagram of the clutch 8. Figure 5It is a stereoscopic view of the clutch 8 from another angle. The clutch 8 comprises an inner ring 82, an outer ring 81 and a second clutch assembly 84. The inner ring 82 has a through hole at its center, which is tightly sleeved on the mandrel 5 and fixed to the mandrel 5. The inner ring 82 is provided with a cylindrical section 821, a ratchet section 822 and a first thread section 823 in sequence along its axial direction, wherein the cylindrical section 821 is used to engage or disengage with the first clutch assembly 83 below, the ratchet section 822 is used to engage or disengage with the first clutch assembly 83, and the first thread section 823 is used to limit the movement direction of the control device 9.

[0050] The inner diameter of the outer ring 81 is slightly larger than the outer diameter of the cylindrical section 821 of the inner ring 82. The inner ring 82 and the outer ring 81 are arranged along the radial direction of the rotation axis. The outer ring 81 can rotate unidirectionally relative to the inner ring 82. The rotation axis refers to the rotation axis of the outer ring 81, that is, Figure 4 The first clutch assembly 83 and the second clutch assembly 84 are disposed between the inner ring 82 and the outer ring 81 and arranged along the axial direction.

[0051] The second clutch assembly 84 includes a pawl 841 and an elastic member (not shown). Fig.10 As shown, the pawl 841 has a locking portion 8413, a control portion and a rotating shaft portion 8411. The rotating shaft portion 8411 is arranged at the bottom of the locking portion 8413. The rotating shaft portion 8411 is cylindrical and is hinged in the movable groove 813 of the inner ring 82 so that the pawl 841 rotates around the axis of the rotating shaft portion 8411. In order to make the pawl 841 rotatably arranged on the outer ring 81, the inner circumference of the outer ring 81 is provided with a movable groove 813 for the pawl 841 to be opened or retracted. The pawl 841 swings outward in the movable groove 813 around the rotation axis of the rotating shaft portion 8411, which is called retraction. Fig. 9 The ratchet 841 swings inwardly in the movable groove 813 around the rotation axis of the shaft portion 8411, which is called opening. Figure 8 shown.

[0052] The locking portion 8413 of the pawl 841 is used to abut or not abut against the locking groove 8221 of the inner ring 82. The controlled portion 8412 of the pawl 841 protrudes along the thickness direction of the locking portion 8413, and the bottom surface of the controlled portion 8412 is a contact surface. The outer peripheral surface of the ratchet segment 822 of the inner ring 82 is formed with a locking groove 8221. When the pawl 841 is opened, the pawl 841 abuts against the locking groove 8221, and the inner ring 82 and the outer ring 81 are engaged. At this time, the inner ring 82, the outer ring 81, and the pawl 841 are connected and cannot rotate relative to the core shaft 5; when the pawl 841 is retracted, the pawl 841 does not abut against the locking groove 8221, and the inner ring 82 and the outer ring 81 are separated. At this time, the outer ring 81 can rotate unidirectionally relative to the inner ring 82.

[0053] In order to prevent the rider from accidentally switching to other modes when riding in the power generation mode, an elastic member is provided to keep the pawl 841 engaged. The elastic member acts on the pawl 841 to keep the pawl 841 against the locking groove 8221. The elastic member can be a torsion spring 831 or a spiral spring 831. One end of the elastic member is fixed to any point of the outer ring 81, and the other end of the elastic member is against the controlled part 8412 of the pawl 841, so that the elastic member has a tendency to open. In this embodiment, the pawl 841 is installed in the movable groove 813 of the outer ring 81 and is fastened with a fixing plate 87. One end of the elastic member can be against the fixing plate 87.

[0054] Fig.11 It is an exploded view of the control device 9. Fig.12 It is an exploded view of the control device 9 from another angle. In order to control whether the ratchet 841 abuts against or does not abut against the locking groove 8221, a control device 9 is provided to control the ratchet 841. The control device 9 comprises a first gear 94, a second gear 95, a third gear 96 and a drive device 93 which are meshed in sequence. The drive device 93 is installed in the control box 91 and is sealed by a cover plate 92 to increase its sealing performance and prevent moisture and lubricant from entering the drive device 93 and causing damage. The driving device 93 can be a micro DC motor. The first gear 94 and the second gear 95 are used to reduce speed and increase torque for the driving device 93. In the present embodiment, the first gear 94 is a worm, the second gear 95 is a worm wheel, the output shaft of the driving device 93 is connected to the first gear 94, the worm gear reduction mechanism 7 has a large transmission ratio, and can effectively reduce the volume of the control device 9. The third gear 96 is a cylindrical gear, the third gear 96 is externally meshed with the second gear 95, and the inner circumferential surface of the third gear 96 is provided with a second thread segment 963. The second thread segment 963 of the third gear 96 is threadedly connected to the first thread segment 823 of the inner ring 82. When the driving device 93 rotates forward or reversely, the driving device 93 drives the third gear 96 to spirally move, and the spiral motion is a composite motion of rotational motion and linear motion.

[0055] The third gear 96 is provided with a conical surface 962, which can contact the contact surface of the controlled portion 8412 of the pawl 841, and the pawl 841 is pushed to open or retract through the conical surface 962. When the third gear 96 moves toward the outer ring 81, the conical surface 962 contacts the controlled portion 8412 of the pawl 841, and the pawl 841 is forced to open outward, so that the pawl 841 is released from the abutment relationship with the locking groove 8221, and the inner ring 82 and the outer ring 81 are separated. Fig. 9 As shown, the outer ring 81 can rotate along the D1 direction (counterclockwise), and the hub motor is no longer in the power generation mode; when the third gear 96 moves away from the outer ring 81, the conical surface 962 separates from the controlled portion 8412 of the pawl 841, and the pawl 841 engages with the locking groove 8221 under the action of the elastic member, as shown in FIG. Figure 8As shown, the outer ring 81 cannot rotate along the D2 direction (clockwise), and the hub motor enters the power generation mode.

[0056] The advantage of spiral motion is that, compared with reciprocating linear motion, the switching between the open and retracted states of the pawl 841 is slow, there is no sense of jerkiness, and the force of the third gear 96 pushing the pawl 841 is large, which can effectively overcome the strong bite force between the pawl 841 and the locking groove 8221.

[0057] In order to obtain the position signal of the pawl 841 so that the rider can accurately switch the power generation mode, the control device 9 is provided with a signal feedback module, which includes a magnet 961 arranged on the third gear 96 and a Hall element 98 (not shown) arranged on the circuit board 97. When the third gear 96 spirally moves to the Hall element 98 close to the circuit board 97, the magnetic field strength detected by the Hall element 98 is the highest at this time, so it can be determined that the pawl 841 is engaged with the locking groove 8221, and a corresponding engagement signal is output; when the third gear 96 spirally moves to the Hall element 98 away from the circuit board 97, the magnetic field strength detected by the Hall element 98 is weak at this time, so it can be determined that the pawl 841 is engaged with the locking groove 8221. The magnetic field strength of the magnet 961 installed on the third gear 96 is sensed by the Hall element 98 to obtain a pulse signal, and the engagement signal or separation signal of the pawl 841 is indirectly determined, so that the rider can know the mode of the hub motor.

[0058] The hub motor can drive the output member 2 to rotate when the motor assembly 6 is working. Conversely, when the motor assembly 6 stops working, the hub motor is in human-powered drive mode or the vehicle is coasting, the output member 2 will rotate with the rotor 62 of the motor assembly 6. The magnetic field effect between the rotor 62 and the stator 61 will produce a certain resistance torque, hindering the rotation of the sun gear 71 and the rotor 62, resulting in a dragging feeling during coasting, which will make the rider more tired during the riding process and reduce the riding experience.

[0059] In order to reduce the drag feeling when the above-mentioned hub motor is in human-powered driving mode or the vehicle is coasting, a clutch 8 is usually arranged between the reduction mechanism 7 and the output member 2. The clutch 8 has the characteristic of allowing unidirectional rotation. When the hub motor is in human-powered driving mode or the vehicle is coasting, the clutch 8 can rotate in one direction, releasing the relatively fixed relationship between the reduction mechanism 7 and the output member 2. Therefore, the output member 2 will not drive the sun gear 71 and the rotor 62 to rotate, and no drag feeling will be generated. When the motor assembly 6 is working, the clutch 8 cannot rotate, and the torque generated by the motor assembly 6 is normally output to the output member 2 through the reduction mechanism 7 and the clutch 8.

[0060] A first clutch assembly 83 is also provided between the inner ring 82 and the outer ring 81. Figure 5As shown, the first clutch assembly 83 includes a rolling element 832, the inner wall of the outer ring 81 is provided with a raceway 812, the rolling element 832 is movably arranged in the raceway 812, the outer side wall of the raceway 812 is inclined, the raceway 812 has a first receiving groove 8121 and a second receiving groove 8122, the radial depth of the first receiving groove 8121 is less than or equal to the diameter of the rolling element 832, the radial depth of the second receiving groove 8122 is greater than the diameter of the rolling element 832, and the rolling element 832 can roll between the first receiving groove 8121 and the second receiving groove 8122. The rolling element 832 can be an element such as a roller, a ball, a needle, etc. In this embodiment, the rolling element 832 is a roller.

[0061] In order to facilitate the processing of the raceway 812 of the outer ring 81, the outer ring 81 adopts a separate design, that is, the outer ring 81 is nested with a bushing 811, and the raceway 812 is arranged on the bushing 811. Because the raceway 812 runs through the bushing 811, the bushing 811 can be processed into an outer contour and a raceway 812 by wire cutting, thereby reducing the processing difficulty and reducing the processing cost.

[0062] It should be noted that the first clutch assembly 83 is in a normal working state only when the pawl 841 of the second clutch assembly 84 is retracted.

[0063] Figure 7 It is the front view (disengaged state) of the clutch 8. When the outer ring 81 rotates along the D1 direction (clockwise), when the rolling element 832 moves into the second receiving groove 8122 of the raceway 812, the outer ring 81, the inner ring 82, and the rolling element 832 are separated, that is, the rolling element 832 does not abut against the outer wall of the inner ring 82, and the outer ring 81 rotates unidirectionally relative to the inner ring 82 around the rotation axis.

[0064] Figure 6 It is the front view (engaged state) of the clutch 8. When the outer ring 81 rotates a short distance along the D2 direction (counterclockwise), the rolling element 832 moves into the first receiving groove 8121 of the raceway 812, and the outer ring 81, the inner ring 82, and the rolling element 832 engage, that is, the side wall of the raceway 812 arranged on the outer ring 81 and the outer wall of the inner ring 82 are abutted by the rolling element 832. At this time, the outer ring 81 cannot continue to rotate along the D2 direction, and the outer ring 81 is fixed relative to the inner ring 82.

[0065] In order to enable the outer ring 81 to quickly switch from rotating in the direction of D1 to stopping rotating, the rolling element 832 can return to the first accommodating groove 8121 in time, and the first clutch assembly 83 also includes a spring 831, which is arranged in the raceway 812, one end of the spring 831 abuts against the rolling element 832, and one end of the spring 831 abuts against the side wall of the raceway 812.

[0066] Compared with the case where the spring 831 is not provided, the case where the spring 831 is provided, when the outer ring 81 rotates along the direction D1, the spring 831 is compressed to store elastic force; when the outer ring 81 stops rotating, the spring 831 is extended to release elastic force, and the rolling element 832 is quickly pushed to move into the first receiving groove 8121. By providing the spring 831, the clutch 8 can quickly switch between the fixed state and the one-way rotation state, and the time interval is extremely short.

[0067] In order to reduce the assembly gap, in this embodiment, a partition 85 is provided. The partition 85 is an annular thin plate structure. The partition 85 is connected to the outer ring 81 by screws to fix the two. The outer diameter of the partition 85 is roughly equal to the outer diameter of the outer ring 81. The partition 85 is located on the same side of the inner ring 82 and the outer ring 81, and can isolate the outer ring 81 from other adjacent components. The function of the partition 85 is that when the outer ring 81 rotates relative to the inner ring 82, the partition 85 can block the outer ring 81 from other adjacent components. Since the clutch 8 is a small-structured part, it is easy to process and the processing accuracy can be very high. The assembly gap between the outer ring 81 and the partition 85 can be controlled to a very small size, which is much smaller than the assembly gap when the clutch 8 is directly installed with other fixed ends of the hub motor. Therefore, the volume of the entire device can be reduced.

[0068] The clutch 8 can be arranged between the speed reduction mechanism 7 and the output member 2, or the planet carrier and the clutch 8 can be arranged as one body. In this embodiment, the planet carrier and the clutch 8 are arranged as one body, that is, the outer ring 81 of the clutch 8 is provided with a planet shaft 86, and the planetary gear 73 is rotatably hinged on the planet shaft 86, and the axis direction of the planet shaft 86 is parallel to the direction of the rotation axis. The clutch 8 has both the support function and the unidirectional rotation function of the planet carrier, which can make the structure of the hub motor more compact and further reduce the volume.

[0069] When the motor assembly 6 is working, the rotor 62 generates torque to drive the sun gear 71 to rotate. The direction of rotation of the planetary gear 73 is opposite to that of the sun gear 71. The planetary gear 73 is rotationally hinged on the outer ring 81. The outer ring 81 has a tendency to rotate in the same direction as the sun gear 71. However, the clutch 8 is set to allow only one-way rotation. At this time, the clutch 8 is engaged, the outer ring 81, the inner ring 82 and the core shaft 5 are fixed at the same time, and the ring gear 72 rotates and outputs torque. Since the ring gear 72 is fixedly connected to the output member 2, it is both the direction of rotation of the output member 2 and the direction of the vehicle's advance.

[0070] When the motor assembly 6 stops working, a certain resistance torque is generated due to the magnetic field effect between the rotor 62 and the stator 61. The rotor 62 and the sun gear 71 can be regarded as temporarily fixed, and the vehicle is still gliding. The output member 2 drives the ring gear 72 to continue to rotate. According to the motion characteristics of the planetary gear 73 mechanism, the ring gear 72 is active, the sun gear 71 is fixed, and the planetary carrier is driven. Then the planetary carrier will rotate in the direction of the vehicle's forward movement, that is, the outer ring 81 will rotate in the direction of the vehicle's forward movement. At this time, the clutch 8 is disengaged, and the rotation of the output member 2 does not drive the sun gear 71 to rotate. The kinetic energy of the output member 2 will not be transmitted to the sun gear 71 and the rotor 62, which also means that there will be no drag feeling.

[0071] The first clutch assembly 83 is of automatic control type, while the second clutch assembly 84 is of control type, and the two work independently without interfering with each other.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0073] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A clutch, characterized in that: The invention comprises an inner ring (82) and an outer ring (81) sleeved on the outer side of the inner ring (82); a second clutch assembly (84) is arranged between the inner ring (82) and the outer ring (81); the outer ring (81) can be fixed relative to the inner ring (82) or unidirectionally rotate around a rotation axis; the second clutch assembly (84) and a control device (9) are linked; the control device (9) controls the second clutch assembly (84) to make the inner ring (82) and the outer ring (81) engage or disengage; The second clutch assembly (84) includes a pawl (841) and an elastic member, wherein the pawl (841) is rotatably arranged on the outer ring (81), and the inner ring (82) is provided with a locking groove (8221). When the pawl (841) abuts against the locking groove (8221), the inner ring (82) and the outer ring (81) are engaged, and when the pawl (841) does not abut against the locking groove (8221), the inner ring (82) and the outer ring (81) are separated, and the elastic member acts on the pawl (841) to keep the pawl (841) abutting against the locking groove (8221).

2. The clutch according to claim 1, characterized in that: The control device (9) comprises a first gear (94), a second gear (95), a third gear (96) and a driving device (93) which are meshed in sequence, wherein an output shaft of the driving device (93) is connected to the first gear (94), the third gear (96) is provided with a conical surface (962), and the driving device (93) drives the third gear (96) to move helically, and drives the ratchet pawl (841) to open or retract through the conical surface (962).

3. The clutch according to claim 2, characterized in that: The control device (9) is provided with a signal feedback module, which includes a magnet (961) arranged on the third gear (96) and a Hall element (98) arranged on a circuit board (97), wherein the Hall element (98) senses the magnetic field strength of the magnet (961) installed on the third gear (96) to obtain a pulse signal, and determines the engagement signal or the disengagement signal of the ratchet (841).

4. The clutch according to claim 1, characterized in that: It also includes a partition (85), wherein the partition (85) is fixedly connected to the outer ring (81).

5. The clutch according to claim 1, characterized in that: A first clutch assembly (83) is further provided between the inner ring (82) and the outer ring (81), and the first clutch assembly (83) includes a rolling element (832) and a spring (831). A raceway (812) is provided on the inner wall of the outer ring (81), and the spring (831) is provided in the raceway (812). One end of the spring (831) abuts against the rolling element (832), and one end of the spring (831) abuts against the side wall of the raceway (812). The rolling element (832) is movably provided in the raceway (812), and the raceway (81 2) having a first accommodating groove (8121) and a second accommodating groove (8122); when the rolling element (832) moves into the first accommodating groove (8121), the outer ring (81), the inner ring (82) and the rolling element (832) engage, and the outer ring (81) is fixed relative to the inner ring (82); when the rolling element (832) moves into the second accommodating groove (8122), the outer ring (81), the inner ring (82) and the rolling element (832) separate, and the outer ring (81) rotates unidirectionally around the rotation axis relative to the inner ring (82).

6. The clutch according to claim 1, characterized in that: The outer ring (81) is provided with a planetary shaft (86), and the axial direction of the planetary shaft (86) is parallel to the direction of the rotation axis.

7. A hub motor, characterized in that: The clutch (8) comprises the clutch (8) as claimed in any one of claims 1 to 6, and further comprises a core shaft (5), an input member (1) and an output member (2), wherein the input member (1) is fixedly mounted on the output member (2), the output member (2) is rotatably arranged on the core shaft (5), a motor module is arranged in the output member (2), the motor module comprises a motor assembly (6) and a reduction mechanism (7), the motor assembly (6), the reduction mechanism (7) and the output member (2) are connected in sequence, the motor module is used to output torque to the output member (2), the clutch (8) is arranged between the reduction mechanism (7) and the output member (2), and when the control device (9) controls the second clutch assembly (84) to engage the inner ring (82) and the outer ring (81), the motor module switches to a power generation mode.

8. The wheel hub motor according to claim 7, characterized in that: The speed reduction mechanism (7) comprises a sun gear (71), a ring gear (72), a planetary gear (73) and a planet carrier, wherein the planetary gear (73) and the clutch (8) are integrally formed, and the planetary gear (73) is rotatably mounted on a planetary shaft (86) of the clutch (8), the sun gear (71) is externally meshed with the planetary gear (73), the planetary gear (73) is internally meshed with the ring gear (72), the ring gear (72) and the output member (2) are fixedly connected, and the motor assembly (6) is ) is connected to the sun gear (71); when the motor assembly (6) generates torque and inputs it to the sun gear (71), the outer ring (81) is fixed relative to the inner ring (82), and the torque is output to the output member (2) through the ring gear (72); when the motor assembly (6) stops generating torque and the output member (2) rotates, the outer ring (81) rotates unidirectionally around the rotation axis relative to the inner ring (82), and the rotation of the output member (2) does not drive the sun gear (71) to rotate.

9. A vehicle, characterized in that: Including the hub motor as described in any one of claims 7-8.

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