Transmission assembly, motor and electric bicycle

Abstract

The invention discloses a transmission component, a motor and an electric bicycle, wherein the transmission component comprises a crankshaft, a one-way clutch and a pedaling frequency sensor are arranged on the crankshaft, a magnetic ring is arranged on the first outer ring of the one-way clutch, the first outer ring is connected to the crankshaft, so that the magnetic ring can rotate synchronously with the crankshaft, and a magnetic induction device is fixedly installed and spaced from the magnetic ring, the magnetic induction device can sense the magnetic field change of the magnetic ring, so as to collect the pedaling frequency and direction data of human pedaling; since the first outer ring is sleeved on the outer side of the crankshaft, the diameter of the first outer ring is larger than the diameter of the crankshaft, and the installation of the magnetic ring on the first outer ring is conducive to increasing the diameter size, so that more magnetic poles can be configured along the circumferential direction of the magnetic ring, the number of pole pairs is more, which is conducive to improving the accuracy and resolution of pedaling frequency and direction data collection, thereby improving the accuracy of control of the motor output speed, and is suitable for electric bicycles.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and more particularly to a transmission assembly, a motor, and an electric bicycle. Background Art

[0002] In an electric bicycle, a cadence sensor is usually used to collect the speed of human pedaling to accurately configure the speed of the motor output, so as to achieve the purpose of electric assistance. During the data acquisition process of the cadence sensor, the accuracy of data acquisition is very important, which directly affects the output power of the configured motor and the user experience. In the related art, the cadence sensor is integrally integrated on the crankshaft. Since the diameter of the crankshaft is small, the number of pole pairs of the induction magnetic ring of the cadence sensor installed on the crankshaft is small in the circumferential direction of the shaft, and high accuracy and high resolution cannot be achieved. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a transmission assembly that can increase the diameter size of the magnetic ring, so that the magnetic ring has more pole pairs, effectively improving the detection accuracy and resolution.

[0004] The present invention also provides a motor and an electric bicycle including the above transmission assembly.

[0005] The transmission assembly according to the first aspect embodiment of the present invention includes:

[0006] A crankshaft;

[0007] A one-way clutch, including a first inner ring and a first outer ring rotatably sleeved outside the first inner ring, and the first outer ring is sleeved on the crankshaft;

[0008] A cadence sensor, including a magnetic ring and a magnetic induction device, the magnetic ring is arranged on the first outer ring so that the magnetic ring rotates synchronously with the crankshaft, and the position of the magnetic induction device is fixed and arranged at an interval from the magnetic ring.

[0009] The transmission assembly according to the embodiment of the present invention has at least the following beneficial effects:

[0010] By providing a one-way clutch and a pedal frequency sensor on the crankshaft, the crankshaft is used to connect the pedals. A magnetic ring is arranged on the first outer ring of the one-way clutch, and the first outer ring is connected to the crankshaft, enabling the magnetic ring to rotate synchronously with the crankshaft. The magnetic induction device is fixedly installed and arranged at an interval from the magnetic ring. When the magnetic ring rotates with the crankshaft, the magnetic induction device can sense the magnetic field change of the magnetic ring, thereby collecting the pedal frequency and pedal direction data of human pedaling. Since the first outer ring is sleeved outside the crankshaft and the diameter of the first outer ring is larger than that of the crankshaft, installing the magnetic ring on the first outer ring is beneficial for increasing the diameter size. In this way, more magnetic poles can be arranged circumferentially on the magnetic ring, and the number of pole pairs is more, which is beneficial for improving the accuracy and resolution of pedal frequency and pedal direction data collection, and further improving the control accuracy of the motor output speed, and is applicable to electric bicycles.

[0011] According to some embodiments of the present invention, the magnetic ring is sleeved on the outer side wall of the first outer ring, and the outer side wall of the first outer ring is provided with a mounting seat for fixing the magnetic ring, and the mounting seat is arranged along the circumference of the first outer ring.

[0012] According to some embodiments of the present invention, the mounting seat is made of plastic material, and both the magnetic ring and the first outer ring are fixedly connected to the mounting seat.

[0013] According to some embodiments of the present invention, the number of pole pairs of the magnetic ring is P, satisfying P > 30.

[0014] According to some embodiments of the present invention, the first outer ring and the first inner ring are connected by a ratchet structure.

[0015] According to some embodiments of the present invention, the first outer ring and the crankshaft are connected by splines.

[0016] According to some embodiments of the present invention, the one-way clutch further includes a first gasket and a first snap ring, and the first gasket and the first snap ring are respectively arranged at both ends of the first inner ring along the axial direction of the crankshaft.

[0017] According to some embodiments of the present invention, it further includes:

[0018] A collar, sleeved outside the crankshaft, and the magnetic induction device is arranged on the collar and is arranged at an interval from the magnetic ring along the axial direction of the crankshaft.

[0019] According to some embodiments of the present invention, it further includes:

[0020] A torque sensor, including a second inner ring and a second outer ring sleeved outside the second inner ring, the second outer ring is fixedly arranged relative to the second inner ring, and the second outer ring is used to detect the torque transmitted by the second inner ring;

[0021] Wherein, the second inner ring is rotatably connected to the crankshaft and fixedly connected to the first inner ring.

[0022] According to some embodiments of the present invention, the first inner ring and the second inner ring are connected by splines.

[0023] According to some embodiments of the present invention, the second outer ring and the collar are integrally connected.

[0024] According to some embodiments of the present invention, it further includes:

[0025] An overrunning clutch, including a third inner ring sleeved on the crankshaft, a bearing is provided between the third inner ring and the crankshaft, and the third inner ring and the second inner ring are connected by splines.

[0026] According to some embodiments of the present invention, the torque sensor further includes a second gasket and a second snap ring, and the second gasket and the second snap ring are used to axially position the second inner ring along the crankshaft.

[0027] The motor according to the second aspect embodiment of the present invention includes the transmission assembly described in the first aspect embodiment above.

[0028] The motor adopts all the technical solutions of the transmission assembly in the above embodiments, and thus has at least all the beneficial effects brought by the technical solutions in the above embodiments.

[0029] The electric bicycle according to the third aspect embodiment of the present invention includes a mid-drive motor, and the mid-drive motor is the motor described in the second aspect embodiment above.

[0030] The electric bicycle according to the embodiment of the present invention has at least the following beneficial effects:

[0031] The electric bicycle adopts all the technical solutions of the motor in the above embodiments, and thus has at least all the beneficial effects brought by the technical solutions in the above embodiments.

[0032] Other features and advantages of the present invention will be described in the subsequent specification, and in part, will be obvious from the specification, or will be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0034] Figure 1 is a schematic structural diagram of a transmission assembly according to an embodiment of the present invention;

[0035] Figure 2Schematic diagram of the connection structure between the pedal frequency sensor and the one-way clutch according to an embodiment of the present invention;

[0036] Figure 3 is Figure 1 Schematic cross-sectional structure diagram in the A-A direction in;

[0037] Figure 4 is Figure 1 Schematic cross-sectional structure diagram in the B-B direction in;

[0038] Figure 5 Schematic cross-sectional view of the mid-mounted motor according to an embodiment of the present invention;

[0039] Figure 6 is Figure 5 Enlarged structure diagram at position C in;

[0040] Reference numerals:

[0041] Crankshaft 100;

[0042] One-way clutch 200; First outer ring 210; Sleeve 211; Tooth part 212; First inner ring 220; First gasket 221; First snap ring 222; Pawl 223;

[0043] Pedal frequency sensor 300; Magnetic ring 310; Mounting seat 311; Magnetic induction device 320;

[0044] Bracket 400;

[0045] Torque sensor 500; Second outer ring 510; Second inner ring 520; Second snap ring 521; Second gasket 522;

[0046] Third inner ring 600; Bearing 610;

[0047] Transmission assembly 1000;

[0048] Mid-mounted motor 2000. Detailed implementation manners

[0049] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "axial direction" and "radial direction" is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention.

[0051] In the description of the present invention, if the first and second are described only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0052] In the description of the present invention, it should be noted that terms such as "arrangement", "installation", and "connection" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0053] In the description of the present invention, the description of some embodiments, specific embodiments, etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. 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 can be combined in a suitable manner in any one or more embodiments or examples.

[0054] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the drawings. Obviously, the following described embodiments are some embodiments of the present invention, not all embodiments.

[0055] Reference Figures 1 to 4 Describe the transmission assembly 1000 of the embodiment of the present invention. The transmission assembly 1000 is applicable to the motor of an electric bicycle. The following will illustrate the transmission assembly 1000 with specific examples.

[0056] Refer to Figure 1 And Figure 2 As shown, the transmission assembly 1000 provided by the embodiment includes a crankshaft 100 and a one-way clutch 200 arranged on the crankshaft 100. Among them, the one-way clutch 200 includes a first inner ring 220 and a first outer ring 210. The first outer ring 210 is sleeved outside the first inner ring 220. Both ends of the crankshaft 100 in the axial direction are respectively connected to the pedals through cranks. The first outer ring 210 is connected to the crankshaft 100 through a spline connection. The first outer ring 210 can rotate together with the crankshaft 100. The one-way torque transmission between the first outer ring 210 and the first inner ring 220 is realized through a ratchet structure.

[0057] It can be understood that when human power is input through pedaling, the driving crankshaft 100 rotates. The crankshaft 100 can drive the first outer ring 210 to rotate. At this time, the first outer ring 210 can drive the first inner ring 220 to rotate. The first inner ring 220 can be connected to the power output component, so as to transmit power to the power output component through the first inner ring 220.

[0058] Referring to Figure 2 As shown, the transmission assembly 1000 of the embodiment further includes a cadence sensor 300. The cadence sensor 300 includes a magnetic ring 310 and a magnetic induction device 320. Among them, the magnetic ring 310 is installed on the one-way clutch 200, and the magnetic induction device 320 is fixedly installed at a position corresponding to the magnetic ring 310, so that the magnetic induction device 320 can detect the magnetic field change of the magnetic ring 310. Specifically, the magnetic ring 310 is arranged on the first outer ring 210. The magnetic ring 310 is integrally annular and sleeved tightly outside the first outer ring 210, so that the magnetic ring 310 can rotate synchronously with the crankshaft 100. Figure 2 The structure of the crankshaft 100 is omitted in

[0059] It can be understood that a plurality of magnetic poles are arranged on the magnetic ring 310, and the magnetic poles are distributed along the circumferential direction of the magnetic ring 310, generating a magnetic field around the magnetic ring 310. When the magnetic ring 310 rotates, the direction of the magnetic field will change. Since the magnetic ring 310 is linked with the first outer ring 210 and the crankshaft 100, when human power is input through the crankshaft 100, the rotation speed of the magnetic ring 310 can be calculated by detecting the change of the magnetic field through the magnetic induction device 320. According to the rotation speed of the magnetic ring 310, the human pedaling speed can be obtained. The magnetic poles of the magnetic ring 310 are divided into N poles and S poles. Usually, the magnetic poles appear in pairs, and the number of magnetic poles can also be understood as the number of pole pairs. For example, the number of magnetic poles can be 20, and the magnetic poles are evenly distributed along the circumferential direction of the magnetic ring 310. Taking the Hall element as an example for illustration, the Hall element is a magnetic sensor based on the Hall effect. According to the Hall effect, the magnetic field of the magnetic poles and its changes can be detected. When the changing magnetic field passes through the Hall element, the Hall element can detect a pulse signal. According to the pulse signal series, the number of pulses emitted per unit time can be measured, so as to determine the rotation speed of the magnetic ring 310.

[0060] It should be noted that the human power can drive the crankshaft 100 to rotate forward or backward by pedaling. Since the one-way clutch 200 can only transmit power in one direction, the direction in which the crankshaft 100 drives the first outer ring 210 and the first inner ring 220 to rotate can be understood as the forward direction. At this time, the power can be transmitted from the crankshaft 100 to the first outer ring 210 and the first inner ring 220 in sequence; when the crankshaft 100 rotates backward, no power transmission occurs between the first outer ring 210 and the first inner ring 220.

[0061] Referring to Figure 2 As shown, it can be understood that the first outer ring 210 and the first inner ring 220 are arranged in sequence from the inside to the outside along the radial direction of the crankshaft 100. Since the diameters of both the first outer ring 210 and the first inner ring 220 are larger than the diameter of the crankshaft 100, and the diameter of the first outer ring 210 is the largest. The magnetic ring 310 is sleeved on the outside of the first outer ring 210, and the diameter of the magnetic ring 310 is larger than the diameter of the crankshaft 100. Compared with the installation structure where the magnetic ring 310 is directly sleeved on the crankshaft 100, the magnetic ring 310 has more space to arrange magnetic poles. That is to say, more magnetic poles can be configured along the circumferential direction of the magnetic ring 310, and the number of pole pairs is more. The more the number of pole pairs, the higher the resolution of the magnetic induction device 320 to the magnetic field change, and the higher the detection accuracy. Therefore, it is beneficial to improve the accuracy and resolution of the pedal frequency and pedal direction data acquisition. The motor can also control the output speed more precisely according to the pedal frequency and pedal direction data, making the electric bicycle have better output power and user experience.

[0062] In the embodiment, a collar can be arranged on the outside of the crankshaft 100. The collar is sleeved on the outside of the crankshaft 100 and is non-rotatably arranged. By installing the magnetic induction device 320 on the collar, the position of the magnetic induction device 320 can be fixed. For example, the collar can be used as the housing of the transmission component 1000. When the transmission component 1000 is assembled to the motor, the transmission component 1000 can be fixedly connected to the motor through the collar, so that the position of the magnetic induction device 320 will not change. The magnetic induction device 320 is axially spaced from the magnetic ring 310, and a certain gap is maintained between the magnetic induction device 320 and the magnetic ring 310. The magnetic induction device 320 can quickly respond to the change of the magnetic field and realize non-contact measurement.

[0063] It should be noted that in some embodiments, the magnetic ring 310 can be installed on the end face of the first outer ring 210 along the axial direction close to the magnetic induction device 320, and a certain gap is separated between the magnetic induction device 320 and the magnetic ring 310. In this way, the magnetic induction device 320 can detect the magnetic field of the magnetic poles and its changes. The magnetic ring 310 can be fixed on the end face of the first outer ring 210 by an adhesive method. It can be understood that the diameter of the magnetic ring 310 is equivalent to the diameter of the first outer ring 210, so that the magnetic ring 310 also has a relatively large space to arrange magnetic poles. The specific structure of this embodiment is not shown in the drawings, and the specific working principle can refer to the description of the above embodiment.

[0064] Referring to Figure 1 and Figure 2 As shown, in some embodiments, a mounting seat 311 is provided on the outer sidewall of the first outer ring 210. The mounting seat 311 extends circumferentially along the first outer ring 210 to form a ring shape. The mounting seat 311 is sleeved tightly on the outside of the first outer ring 210. The mounting seat 311 matches the magnetic ring 310, so that the magnetic ring 310 can be fixed on the mounting seat 311, thereby achieving the purpose of fixing the magnetic ring 310.

[0065] It can be understood that the diameter of the first outer ring 210 is larger than the diameter of the collar. The mounting seat 311 is fixed at the end of the first outer ring 210 close to the collar. A bracket 400 for mounting the magnetic induction device 320 is provided on the outer sidewall of the collar. The magnetic ring 310 is fixed on the mounting seat 311, and the magnetic induction device 320 is fixed on the bracket 400. After being installed in place, the magnetic ring 310 and the magnetic induction device 320 can be axially corresponding. Among them, the mounting seat 311 can be fixed on the first outer ring 210 by means of threaded connection, bonding, etc., so that the magnetic ring 310 is not easily separated from the first outer ring 210, and the structure is stable and reliable. In the embodiment, the mounting seat 311 is made of plastic material. During assembly, the magnetic ring 310 is first sleeved on the mounting seat 311 to form a combination, and then the combination is sleeved on the first outer ring 210 by an interference fit method, thereby realizing the rapid installation of the magnetic ring 310.

[0066] It can be understood that the larger the diameter of the first outer ring 210, the larger the diameter of the magnetic ring 310. The number of magnetic poles distributed circumferentially on the magnetic ring 310 can be set more. Under the condition of meeting the actual installation requirements, the number of magnetic poles of the magnetic ring 310 in the embodiment can be set to be greater than 30. That is to say, the number of pole pairs of the magnetic ring 310 is P, satisfying P>30, which is much larger than the number of pole pairs that can be configured when the magnetic ring 310 is directly sleeved on the crankshaft 100, greatly improving the accuracy and resolution of the pedal frequency and pedal direction sensor for collecting pedal frequency and pedal direction data, and the design is more reasonable. For example, the number of pole pairs of the magnetic ring 310 in the embodiment can be set to P = 40, and the magnetic poles are evenly distributed along the circumference of the magnetic ring 310. When the magnetic ring 310 rotates following the first outer ring 210 and the crankshaft 100, the requirement of high detection accuracy is met. It can be understood that the number of pole pairs P of the magnetic ring 310 can also be 50, 60, 80, etc.

[0067] Referring to Figure 1 and Figure 3As shown, in some embodiments, a torque sensor 500 is further installed on the crankshaft 100. The torque sensor 500 includes a second outer ring 510 and a second inner ring 520. Among them, the second outer ring 510 is sleeved on the outside of the second inner ring 520. The second outer ring 510 is set to be non-rotatable, and the second inner ring 520 is set to be rotatable, that is, the second outer ring 510 is fixedly set relative to the second inner ring 520. A certain gap is provided between the second outer ring 510 and the second inner ring 520 in the radial direction, so that the second inner ring 520 can rotate inside the second outer ring 510. When the second inner ring 520 rotates relative to the second outer ring 510, the second outer ring 510 can detect the torque transmitted by the second inner ring 520, thereby realizing the acquisition of torque data.

[0068] Figure 3 As shown, it is a schematic cross-sectional view of the transmission assembly 1000 along the axial direction. It can be understood that the second inner ring 520 is sleeved on the outside of the crankshaft 100. The second inner ring 520 and the crankshaft 100 are not fixedly connected, that is, the crankshaft 100 and the second inner ring 520 can rotate relative to each other. The second inner ring 520 will not rotate with the crankshaft 100, and no power transmission will occur between the crankshaft 100 and the second inner ring 520. For example, a bearing can be provided between the crankshaft 100 and the second inner ring 520, and the movements between the crankshaft 100 and the second inner ring 520 do not interfere with each other. Moreover, the second inner ring 520 is fixedly connected to the first inner ring 220, so that the second inner ring 520 and the first inner ring 220 can cooperate to form a linkage structure, thereby power can be transmitted.

[0069] It can be understood that when the crankshaft 100 is rotated by human power, the power is transmitted in sequence through the first outer ring 210, the first inner ring 220 and the second inner ring 520, so that the magnetic induction device 320 can detect the magnetic field change of the magnetic ring 310 to collect the cadence and pedal direction data. At the same time, the second inner ring 520 rotates relative to the second outer ring 510, and torque data can be collected. In this way, when the transmission assembly 1000 is applied to an electric bicycle, by collecting the speed and torque of human pedaling, the speed and torque of the motor output can be accurately configured to achieve the purpose of electric assistance.

[0070] It should be noted that, referring to Figure 3 As shown, in the embodiment, the second outer ring 510 and the collar are combined into an integral structure. The magnetic induction device 320 is installed on the outside of the second outer ring 510. The collar can not only be used to install the magnetic induction device 320, but also serve as the outer ring of the torque sensor 500, which is beneficial to simplifying the overall structure of the transmission assembly 1000, making it more practical and reliable, so that the cadence sensor 300 and the torque sensor 500 can be assembled onto the crankshaft 100.

[0071] It should be noted that the first outer ring 210 and the first inner ring 220 transmit torque unidirectionally through a ratchet structure. When the first outer ring 210 and the first inner ring 220 are disengaged in the reverse direction, the power of the crankshaft 100 will not be transmitted in the reverse direction to the second inner ring 520, so that the second inner ring 520 has no torque input and does not deform, and thus the stepping data can be collected.

[0072] Refer to Figure 3 As shown, one end of the second inner ring 520 extends to the inside of the first inner ring 220. Along the radial direction of the crankshaft 100 from the inside to the outside, the second inner ring 520, the first inner ring 220, the first outer ring 210 and the magnetic ring 310 are arranged in sequence. Among them, the first inner ring 220 and the second inner ring 520 are connected by splines to achieve power transmission between the first inner ring 220 and the second inner ring 520; while the first inner ring 220 and the first outer ring 210 are connected by a ratchet structure, and the power driven by manpower can be transmitted in sequence along the directions of the first outer ring 210, the first inner ring 220 and the second inner ring 520, and the power cannot be transmitted from the first inner ring 220 to the first outer ring 210, realizing unidirectional power transmission.

[0073] Refer to Figure 4 As shown, Figure 4 For the schematic cross-sectional view of the transmission assembly 1000 along the radial direction, the first inner ring 220 can be a ratchet. A pawl 223 is provided on the outer side of the first inner ring 220, and a tooth portion 212 corresponding to the pawl 223 is provided on the inner side wall of the first outer ring 210. A ratchet structure is formed by the cooperation of the ratchet of the first inner ring 220, the pawl 223 and the tooth portion 212 of the first outer ring 210, and the power can be transmitted from the first outer ring 210 to the first inner ring 220, and cannot be transmitted from the first inner ring 220 to the first outer ring 210 in the opposite direction.

[0074] It should be noted that, refer to Figure 3 As shown, a bushing 211 is provided at one end of the first outer ring 210 away from the torque sensor 500 along the axial direction. The bushing 211 extends radially and is connected to the crankshaft 100. The bushing 211 and the crankshaft 100 are connected by splines, so that power can be transmitted between the first outer ring 210 and the crankshaft 100, and the structure is stable and reliable.

[0075] Refer to Figure 3 As shown, along the axial direction of the crankshaft 100, a first gasket 221 is provided between the first inner ring 220 and the bushing 211, and a first snap ring 222 is provided between the first inner ring 220 and the second outer ring 510. The first inner ring 220 is axially positioned by the first gasket 221 and the first snap ring 222. As Figure 3 shown, considering that one end of the second inner ring 520 is connected to the first inner ring 220, the first gasket 221 can be used to position the ends of both the first inner ring 220 and the second inner ring 520 at the same time.

[0076] Referring to Figure 3 as shown, an overrunning clutch may also be provided on the crankshaft 100. The overrunning clutch is used to connect the motor and output power. Specifically, the overrunning clutch includes a third outer ring (not shown in the drawings) and a third inner ring 600. The third outer ring is connected to the motor through a transmission structure. There is a one-way power transmission between the third outer ring and the third inner ring 600. The third inner ring 600 is sleeved on the crankshaft 100. A bearing 610 is provided between the third inner ring 600 and the crankshaft 100 to make the movements between the crankshaft 100 and the third inner ring 600 not interfere with each other. In addition, the third inner ring 600 and the second inner ring 520 are connected by splines, enabling two-way power transmission between the third inner ring 600 and the second inner ring 520.

[0077] Referring to Figure 3 as shown, along the axial direction of the crankshaft 100, the one-way clutch 200 is provided at one end close to the crankshaft 100, and the overrunning clutch is provided at the other end close to the crankshaft 100. When power is input by manpower through pedaling, the crankshaft 100 is driven to rotate, and the power is transmitted sequentially along the first outer ring 210, the first inner ring 220, the second inner ring 520, and the third inner ring 600, and then the power is output through the third inner ring 600. At this time, speed and torque data can be collected, and the power will not be transmitted to the third outer ring, without affecting the structure of the motor.

[0078] When power is input by the motor, the power of the motor is transmitted along the third outer ring to the third inner ring 600, and then the power is output through the third inner ring 600. Since the third inner ring 600 is connected to the second inner ring 520, the power of the motor can drive the second inner ring 520 to rotate simultaneously, so that the torque data output by the motor can be collected. Of course, manpower and the motor can input power simultaneously, and both powers are output outward through the third inner ring 600. According to the collected speed and torque, the speed and torque output by the motor are accurately configured to achieve a better boosting effect.

[0079] It should be noted that the third inner ring 600 can be directly connected to the power output component. For example, the third inner ring 600 is connected to a sprocket, and power is transmitted to the chain through the sprocket, thereby driving the electric bicycle to run.

[0080] Referring to Figure 3 as shown, a second gasket 522 and a second snap ring 521 are provided on the outer side of the second inner ring 520. The second snap ring 521 can axially position the second inner ring 520. The second snap ring 521 is located at the gap position between the second outer ring 510 and the third outer ring. At the same time, the second gasket 522 is provided on the side of the second snap ring 521 close to the second outer ring 510. The second gasket 522 is an anti-wear gasket, which can avoid the friction between the second snap ring 521 and the second outer ring 510 and improve the stability of positioning.

[0081] Reference Figure 5 and Figure 6 A motor according to an embodiment of the present invention is applicable to an electric bicycle, specifically a mid-mounted motor 2000 of an electric bicycle.

[0082] Refer to Figure 5 and Figure 6 as shown Figure 5 As shown is a schematic cross-sectional view of the mid-mounted motor 2000. The transmission assembly 1000 of the above embodiment is assembled with the motor into an integral structure, and the drive shaft of the motor can be connected to the overrunning clutch through a transmission structure. Since the magnetic ring 310 is mounted on the first outer ring 210 of the one-way clutch 200, the diameter of the magnetic ring 310 is larger than that of the crankshaft 100, and more magnetic poles can be arranged along the circumferential direction of the magnetic ring 310, with more pole pairs, which is beneficial to improving the accuracy and resolution of the pedal frequency and pedal direction data acquisition. The motor can also control the output speed more precisely according to the pedal frequency and pedal direction data, making the electric bicycle have better output power and user experience.

[0083] An electric bicycle (not shown in the drawings) provided by an embodiment of the present invention can also be understood as an electric assist vehicle, and the electric bicycle applies the motor of the above embodiment. Since the electric bicycle adopts all the technical solutions of the motor of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here.

[0084] The above has described the embodiments of the present invention in detail with reference to the drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. Transmission assembly, characterized in that, Comprising: A crankshaft; A one-way clutch, including a first inner ring and a first outer ring rotatably sleeved outside the first inner ring, the first outer ring being sleeved on the crankshaft; A cadence sensor, including a magnetic ring and a magnetic induction device, the magnetic ring being provided on the first outer ring so that the magnetic ring rotates synchronously with the crankshaft, the position of the magnetic induction device being fixed and spaced from the magnetic ring; A collar, sleeved outside the crankshaft and non-rotatably arranged, the magnetic induction device being provided on the collar and axially spaced from the magnetic ring along the crankshaft; A torque sensor, including a second inner ring and a second outer ring sleeved outside the second inner ring, the second outer ring being non-rotatably arranged, the second inner ring being rotatably arranged, and the second inner ring being capable of rotating inside the second outer ring; when the second inner ring rotates relative to the second outer ring, the second outer ring can detect the torque transmitted by the second inner ring; Wherein, the second inner ring is sleeved outside the crankshaft, the second inner ring is rotatably connected to the crankshaft and fixedly connected to the first inner ring, the magnetic ring is sleeved on the outer side wall of the first outer ring, an installation seat for fixing the magnetic ring is provided on the outer side wall of the first outer ring, the installation seat is arranged circumferentially along the first outer ring, the diameter of the first outer ring is larger than the diameter of the collar, the second outer ring is integrally connected to the collar, and the first outer ring is connected to the crankshaft by a spline; Further comprising an overrunning clutch, the overrunning clutch including a third outer ring and a third inner ring, the third inner ring being sleeved on the crankshaft, a bearing being provided between the third inner ring and the crankshaft, the third inner ring being connected to the second inner ring by a spline, the third outer ring being connected to the motor through a transmission structure, and power being transmitted unidirectionally between the third outer ring and the third inner ring.

2. The drive assembly according to claim 1, wherein The installation seat is made of plastic material, and both the magnetic ring and the first outer ring are fixedly connected to the installation seat.

3. The transmission component according to claim 1, characterized in that, The number of pole pairs of the magnetic ring is P, satisfying P > 30.

4. The drive assembly according to claim 1, characterized in that, The first outer ring is connected to the first inner ring through a ratchet structure.

5. The transmission assembly according to claim 1, characterized in that The one-way clutch further includes a first gasket and a first snap ring, the first gasket and the first snap ring being respectively provided at both ends of the first inner ring along the axial direction of the crankshaft.

6. The drive assembly according to claim 1, wherein The first inner ring is connected to the second inner ring by a spline.

7. The drive assembly according to claim 1, wherein, The torque sensor further includes a second gasket and a second snap ring, the second gasket and the second snap ring being used to axially position the second inner ring along the crankshaft.

8. Electric motor, characterized in that, Comprising the transmission assembly according to any one of claims 1 to 7.

9. Electric bicycle, characterized in that, Including a mid-mounted motor, the mid-mounted motor being the motor according to claim 8.

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