Middle motor and power-assisted bicycle

Abstract

The utility model relates to a middle motor and a power-assisted bicycle, the middle motor comprises a middle shaft assembly, a pawl assembly, a ratchet wheel, a chain wheel sleeve, a shell, a first connector, a second connector, a first sealing structure and a second sealing structure, and the middle shaft assembly is used for receiving driving force of a transmission assembly or external force from pedals; the pawl assembly comprises a pawl and a transition sleeve, the pawl is fixed to the transition sleeve, and the transition sleeve is detachably connected to the middle shaft assembly; the ratchet wheel is provided with a tooth groove in the circumferential direction, and the pawl is clamped into the tooth groove. The chain wheel sleeve is fixedly connected with the ratchet wheel and can rotate under the rotation effect of the ratchet wheel in the preset direction. The first connector is installed on the machine shell and penetrates through a via hole in the machine shell. The second connector is detachably and electrically connected with the first connector to supply power; the first sealing structure and the second sealing structure form liquid sealing between the first connector and the hole wall of the via hole. The pawl does not need to be installed on the middle shaft assembly, flexibility is high, two-stage sealing can be achieved through the two sealing structures, and the effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a mid-mounted motor and an assisted bicycle. Background Art

[0002] Generally, the driving force generated by the motor assembly inside the mid-mounted motor is output through a chainring, and then the vehicle is driven by the chainring. While the vehicle is driven by manual pedaling, the mid-mounted motor can provide torque to the chainring to assist the vehicle in moving. This usage mode can be called the assisted mode. If no assistance is needed, or in the case where the power of the mid-mounted motor is exhausted, etc., the vehicle can also be driven only by external force pedaling. This usage mode can be called the non-assisted mode.

[0003] In order to improve the riding experience of the assisted bicycle, the mid-mounted motor mostly uses a clutch to output torque to the chainring. The clutch includes a wedge clutch and a ratchet pawl clutch. The wedge clutch has a small torque-bearing capacity and cannot meet the large torque requirements of freight vehicles. Although the current ratchet pawl clutch can meet the large torque requirements, its flexibility is poor, and it is not convenient for maintenance or replacement. Summary of the Utility Model

[0004] Problems to be Solved by the Utility Model

[0005] Aiming at the problem of poor flexibility of the ratchet pawl clutch in the current mid-mounted motor, the embodiments of the present disclosure provide a mid-mounted motor and an assisted bicycle.

[0006] Solutions for Solving the Problems

[0007] The embodiments of the first aspect of the present disclosure provide a mid-mounted motor, which includes:

[0008] A motor assembly for generating a driving force;

[0009] A transmission assembly connected to the motor assembly to transmit the driving force generated by the motor assembly;

[0010] A central shaft assembly for receiving the driving force of the transmission assembly or receiving the external force from the pedals;

[0011] A pawl assembly including a pawl and a transition sleeve. The pawl is fixed to the transition sleeve, and the transition sleeve is detachably connected to the central shaft assembly and can drive the pawl to rotate under the rotation of the central shaft assembly;

[0012] A ratchet having tooth grooves along its circumference. The pawl is engaged in the tooth grooves, and the ratchet can rotate in the preset direction under the rotation of the pawl in the preset direction;

[0013] The chainring sleeve is fixedly connected to the ratchet, and the chainring sleeve can rotate under the rotation of the ratchet in the preset direction;

[0014] The housing has a receiving space that at least houses the central shaft assembly, the pawl assembly, the ratchet, and the chainring sleeve;

[0015] The first connector is fixed relative to the housing, and the first connector is used to supply power to the mid-motor; the housing has a through-hole at the position corresponding to the first connector, and at least a part of the first connector passes through the through-hole;

[0016] The second connector is detachably electrically connected to the first connector to transmit the power of the external power supply to the mid-motor through the first connector;

[0017] The first sealing structure is located between the first connector and the hole wall of the through-hole;

[0018] The second sealing structure is located between the first sealing structure and the second connector, and both the first sealing structure and the second sealing structure form a liquid seal between the first connector and the hole wall of the through-hole.

[0019] Optionally, the transition sleeve is an annular member;

[0020] The annular transition sleeve includes: an inner ring portion, an outer ring portion, and a transition portion located between the outer ring portion and the inner ring portion. The inner ring portion has a shaft hole for the central shaft assembly to pass through;

[0021] The transition portion has a mounting position that is at least used for mounting the pawl;

[0022] The outer ring portion has a plurality of avoidance openings spaced circumferentially along it; the pawl 121 passes through the avoidance opening to snap into the tooth socket.

[0023] Optionally, the pawl assembly further includes:

[0024] An elastic member is connected to the transition sleeve and provides an elastic force, and the elastic force is used to keep the pawl in a state of being snapped into the tooth socket;

[0025] A stopper is connected to the transition sleeve, and both the elastic member and the pawl are located between the stopper and the transition sleeve. The stopper is used to fix the elastic member and the pawl to the transition sleeve.

[0026] The mounting position is a mounting groove, and both the elastic member and the stopper are mounted in the mounting groove;

[0027] The axial end of the transition sleeve has an opening communicating with the mounting groove, the opening of the stopper;

[0028] The avoidance opening is located on one circumferential side of the transition sleeve and communicates with the installation groove.

[0029] Optionally, the installation groove has a first arc surface, one end of the pawl is connected to the arc surface, and after the other end of the pawl passes through the avoidance opening, it extends outwards from the outer ring part.

[0030] Optionally, the installation groove has a second arc surface, one end of the elastic member is connected to the second arc surface, and the other end of the elastic member is connected to the pawl.

[0031] Optionally, the outer ring part has a limiting part protruding towards the inner ring part; the blocking member is a retaining ring, and the retaining ring is located between the transition part and the limiting part.

[0032] Optionally, the inner ring part has a spline, the spline surrounds the shaft hole and forms the hole wall of the shaft hole, and the inner ring part is spline-connected to the central shaft assembly.

[0033] Optionally, the mid-mounted motor further includes:

[0034] A one-way rotating member, respectively connected to the transmission assembly and the chainring sleeve;

[0035] When the chainring sleeve rotates under the action of the ratchet, the inside of the one-way rotating member is in a separated state;

[0036] When the transmission assembly drives the one-way rotating member to rotate, the inside of the one-way rotating member is in a combined state, and the chainring sleeve rotates under the action of the one-way rotating member.

[0037] Optionally, the chainring sleeve is thread-connected, and the locking direction of the thread connection is the same as the rotation direction when the chainring sleeve outputs driving force.

[0038] Optionally, the central shaft assembly includes:

[0039] A central shaft for receiving external force;

[0040] A shaft sleeve sleeved outside the central shaft and rotating with the rotation of the central shaft;

[0041] A torque sensor connected to the shaft sleeve to detect the torque of the shaft sleeve.

[0042] Optionally, the mid-mounted motor further includes:

[0043] A controller located in the accommodation space;

[0044] The first joint is fixed to the controller and electrically connected to the controller. When the second joint is connected to the first joint, it supplies power to the controller at least.

[0045] Optionally, the first joint includes a first connection terminal electrically connected to the controller, and the second joint includes a second connection terminal. When the second joint is connected to the first joint, the second connection terminal is electrically connected to the first connection terminal to supply power to the controller at least.

[0046] The first connection terminal is welded to the wire on the controller.

[0047] Optionally, the first sealing structure includes a sealing ring. The sealing ring is installed on the first joint and is in interference fit with the inner wall of the through hole; or, the sealing ring is installed on the inner wall of the through hole and is in interference fit with the first joint.

[0048] Optionally, the second sealing structure includes sealant. The sealant is a colloid formed by curing a liquid glue applied between the first joint and the inner wall of the through hole.

[0049] Optionally, the inner wall of the through hole protrudes inward to form a boss. At least part of the sealant is located on the boss and between the boss and the first joint.

[0050] Optionally, there is a gap between the first joint and the inner wall of the through hole. The gap is located above the first sealing structure. At least part of the second joint is inserted into the gap and abuts against the second sealing structure.

[0051] An embodiment of the second aspect of the present disclosure provides an assisted bicycle, which includes:

[0052] A frame;

[0053] The mid-drive motor according to any one of the embodiments of the first aspect, and the mid-drive motor is located on the frame;

[0054] A crank, one end of the crank is connected to the bottom bracket assembly, and the other end of the crank is connected to a pedal.

[0055] The effects of the utility model

[0056] In the mid-mounted motor provided by the embodiments of the present disclosure, a transition sleeve is used as the mounting carrier of the pawl, and the transition sleeve is detachably connected to the central shaft assembly. Therefore, when the pawl needs to be repaired or replaced, the transition sleeve can be removed from the central shaft assembly, making the repair or replacement more convenient. Since the pawl is mounted on an independent workpiece (i.e., the transition sleeve), the number of pawls can be increased or decreased according to the torque required by the mid-mounted motor. The same central shaft assembly can be matched with multiple pawls of different torque specifications, facilitating the production of multiple mid-mounted motors with different output torques. Therefore, in the embodiments of the present disclosure, the pawl does not need to be mounted on the central shaft assembly, improving the flexibility of the ratchet-pawl clutch.

[0057] The second sealing structure serves as the first line of defense, and the first sealing structure serves as the second line of defense. Under the dual protection of the second sealing structure and the first sealing structure, the risk of liquid entering the through hole can be reduced, improving the protection of the components inside the housing.

[0058] The assistive bicycle of the embodiments of the present disclosure includes the above-mentioned mid-mounted motor, and thus the assistive bicycle also has the above-mentioned beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a cross-sectional view of the mid-mounted motor and the chainring after connection in some alternative embodiments of the present disclosure;

[0060] Figure 2 It is Figure 1 A schematic structural diagram of a part of the mid-mounted motor including a ratchet-pawl clutch;

[0061] Figure 3 It is Figure 2 An exploded view of a part of the structure of the mid-mounted motor;

[0062] Figure 4 It is Figure 3 A schematic structural diagram of the transition sleeve;

[0063] Figure 5 It is Figure 2 A schematic structural diagram after the pawl is mounted on the transition sleeve;

[0064] Figure 6 It is Figure 5 A schematic structural diagram after removing the blocking member;

[0065] Figure 7 A cross-sectional view after the chainring sleeve and the ratchet are matched;

[0066] Figure 8 It is Figure 1 A schematic external structure diagram of the mid-mounted motor;

[0067] Figure 9 It is Figure 8Cross-sectional view of the structure of the central shaft motor at the connection between the second joint and the first joint;

[0068] Figure 10 For Figure 8 Exploded view (sectioned) of the structure of the central shaft motor at the connection between the second joint and the first joint;

[0069] Figure 11 For Figure 8 Partial structural schematic diagram of the position of the first joint when the second joint is not inserted into the first joint;

[0070] Figure 12 For Figure 11 Structural schematic diagram of the first joint.

[0071] Explanation of reference numerals

[0072] 110. Central shaft assembly; 111. Central shaft; 112. Bush; 1121. External spline; 101. Installation groove; 102. Second arc surface; 103. First arc surface; 104. Limiting part; 105. Avoidance opening; 106. Opening of the installation groove;

[0073] 120. Pawl assembly; 121. Pawl; 122. Transition sleeve; 1221. Inner ring part; 1222. Outer ring part; 1223. Transition part; 1224. Shaft hole; 1225. Internal spline; 123. Stopper; 124. Elastic member;

[0074] 130. Ratchet wheel;

[0075] 140. Chainring sleeve; 141. Internal thread;

[0076] 150. Chainring; 160. Motor assembly; 161. Movement group; 162. First-stage driving gear; 163. Encoder;

[0077] 170. One-way rotating member;

[0078] 180. Torque sensor;

[0079] 190. Transmission assembly; 191. First-stage driven gear; 192. Second-stage driving gear; 193. Final-stage transmission gear;

[0080] 200. Housing; 201. Gap; 202. Through hole; 203. Stretching step; 204. Boss; 210. Second joint; 220. First joint; 221. Annular groove; 222. First connection terminal; 230. First sealing structure;; 240. Second sealing structure;; 260. Controller. Detailed implementation manners

[0081] To make the technical solutions and beneficial effects of the embodiments of the present disclosure more obvious and understandable, the following provides a detailed description by way of specific examples. Among them, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0082] In the description of the present disclosure, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of the simplified description of the present disclosure, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present disclosure.

[0083] In the present disclosure, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" may clearly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; unless otherwise specifically defined.

[0084] In the present disclosure, unless otherwise clearly defined, terms such as "install", "connect", "couple", "fix", "set", etc. shall be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0085] In this disclosure, unless otherwise clearly defined, a first feature being "on", "above", "over", or "upon" a second feature, or "under", "beneath", "below", or "underneath" a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over", or "upon" a second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being "under", "beneath", "below", or "underneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0086] As Figure 1 shown, the mid-mounted motor of the embodiment of this disclosure includes: a central shaft assembly 110, a motor assembly 160, a transmission assembly 190, a one-way rotating member 170, a ratchet pawl assembly 120, a ratchet wheel 130, and a chainring sleeve 140.

[0087] Among them, the driving force of the transmission assembly 190, or receives an external force from the pedal. The chainring sleeve 140 is a component that rotates under the driving action of the transmission assembly 190.

[0088] The chainring sleeve 140 is connected to the chainring 150 on the assisted bicycle, and the chainring 150 rotates with the rotation of the chainring sleeve 140. The rotating chainring 150 can realize the driving of the vehicle. The ratchet pawl assembly 120 and the ratchet wheel 130 together form a ratchet pawl clutch. The central shaft assembly 110 is used to connect the crank with the pedal. The motor assembly 160 is used to generate a driving force, and the transmission assembly 190 is used to transmit the driving force to the one-way rotating member 170. The one-way rotating member 170 can further transmit the driving force transmitted by the transmission assembly 190 to the chainring sleeve 140, but cannot transmit the external force from the ratchet pawl 121 to the transmission assembly 190 through the ratchet wheel 130. In this way, both the assisting effect of the motor assembly 160 and the transmission assembly 190 on cycling can be ensured, and the transmission assembly 190 will not be driven to rotate during the process of the rider stepping on the pedal to drive, reducing the cycling resistance and ensuring the cycling effect.

[0089] Exemplarily, the one-way rotating member 170 is a one-way needle roller bearing.

[0090] When the chainring sleeve 140 rotates under the action of the ratchet wheel 130, the inside of the one-way rotating member 170 is in a separated state; when the transmission assembly 190 drives the one-way rotating member 170 to rotate, the inside of the one-way rotating member 170 is in a combined state, and the chainring sleeve 140 rotates under the action of the one-way rotating member 170.

[0091] Taking Figure 1Taking the mid-mounted motor shown as an example: The inner ring of the one-way needle roller bearing is sleeved outside the chainring sleeve 140, and the outer ring of the one-way needle roller bearing is located inside the final transmission gear 193 of the transmission assembly 190.

[0092] In the non-assisted mode, when the rider pedals, the external force sequentially passes through Figure 3 the shown bottom bracket assembly 110, the transition sleeve 122, the pawl 121, the ratchet 130, and the chainring sleeve 140 and is transmitted to the inner ring of the one-way rotating member 170. When the inner ring of the one-way rotating member 170 is driven to rotate, since the inside of the one-way rotating member 170 is in a separated state, relative rotation occurs between the inner ring and the outer ring of the one-way rotating member 170. Therefore, the rotation of the chainring sleeve 140 does not drive the rotation of the transmission assembly 190, and the rider is not affected by the transmission assembly 190, reducing the riding resistance.

[0093] In the assisted mode, the final transmission gear 193 of the transmission assembly 190 drives the outer ring of the one-way needle roller bearing to rotate. Since the inside of the one-way needle roller bearing is in a combined state, the inner ring of the one-way needle roller bearing also rotates accordingly. Then, the one-way needle roller bearing drives the chainring sleeve 140 to rotate to achieve assistance.

[0094] As Figure 3 and Figure 5 shown, the pawl assembly 120 includes a pawl 121 and a transition sleeve 122. The pawl 121 is fixed to the transition sleeve 122. The transition sleeve 122 is detachably connected to the bottom bracket assembly 110 and can drive the pawl 121 to rotate under the action of the bottom bracket assembly 110. The ratchet 130 has tooth grooves along its circumferential direction, and the pawl 121 is engaged in the tooth grooves. The ratchet 130 can rotate under the action of the pawl 121 rotating in a preset direction;

[0095] The preset direction refers to the direction that can drive the vehicle to move forward. Depending on the reference object, the preset direction can be the counterclockwise direction or the clockwise direction. When the pawl 121 rotates in the direction opposite to the preset direction, the pawl 121 cannot push the ratchet 130 to rotate. Therefore, by utilizing the characteristics of the ratchet-pawl clutch, when the rider steps forward on the pedals and drives the crank to rotate in one direction, the vehicle can move forward; when stepping backward on the pedals and driving the crank to rotate in the opposite direction, the vehicle will not move backward, ensuring the safety of riding.

[0096] In the embodiments of the present disclosure, the transition sleeve 122 is used as the installation carrier of the pawl 121, and the transition sleeve 122 is detachably connected to the central shaft assembly 110. Therefore, when the pawl 121 needs to be repaired or replaced, the transition sleeve 122 can be removed from the central shaft assembly 110, making the repair or replacement more convenient. Since the pawl 121 is installed on an independent workpiece (i.e., the transition sleeve 122), the number of pawls 121 can be increased or decreased according to the torque required by the mid-mounted motor. The same central shaft assembly 110 can be matched with multiple pawls 121 of different torque specifications, facilitating the production of multiple mid-mounted motors with different output torques.

[0097] Compared with the current installation of the pawl 121 on the central shaft assembly 110, the embodiments of the present disclosure install the pawl 121 on an independent workpiece, improving the flexibility of the ratchet-pawl clutch.

[0098] Figure 3 Exemplarily, six pawls 121 (abbreviated as six-paw) are shown. The ratchet 130 is an annular member, and the tooth grooves are located on the inner circumferential side wall of the ratchet 130 and are arranged along the circumferential direction of the ratchet 130. In embodiments not shown in the present disclosure, the number of pawls 121 can also be four, five, eight or other numbers.

[0099] The chainring sleeve 140 is detachably connected to the ratchet 130. Thus, when replacing the pawl assembly 120, the ratchet 130 can also be conveniently removed from the chainring sleeve 140 without replacing other workpieces such as the chainring sleeve 140.

[0100] In the embodiments shown in the present disclosure, the chainring sleeve 140 is threadedly connected to the ratchet 130. As Figure 7 shown, the chainring sleeve 140 is a columnar hollow member, and the inner wall of the chainring sleeve 140 has internal threads 141, and the outer circumferential surface of the ratchet 130 has external threads, and the two are threadedly connected.

[0101] The locking direction of the threaded connection between the chainring sleeve 140 and the ratchet 130 is the same as the rotation direction of the chainring sleeve 140 when outputting driving force. Thus, during the rotation of the ratchet 130 by the force of the rider stepping on the pedal, and during the rotation of the chainring sleeve 140 driven by the driving force of the motor assembly 160, the fit between the ratchet 130 and the chainring sleeve 140 will become tighter and tighter.

[0102] Figure 1 In the mid-mounted motor shown, the tightening direction of the threaded connection between the chainring sleeve 140 and the ratchet 130 is left-handed, and the tightening direction is consistent with the working direction of the motor assembly 160.

[0103] As Figure 4As shown, according to some alternative embodiments, the transition sleeve 122 is an annular member; the annular transition sleeve 122 includes: an inner ring portion 1221, an outer ring portion 1222, and a transition portion 1223 located between the outer ring portion 1222 and the inner ring portion 1221. The inner ring portion 1221 has a shaft hole 1224 for the central shaft assembly 110 to pass through; the transition portion 1223 has a mounting position, such as Figure 5 and Figure 6 As shown, the mounting position is at least for mounting the pawl 121; the outer ring portion 1222 has a plurality of avoidance openings 105 spaced circumferentially along it; the pawl 121 passes through the avoidance openings 105 to snap into the tooth sockets.

[0104] The transition sleeve 122 is a physically inseparable integral workpiece. Different parts of the transition sleeve 122 are used to realize its connections with the central shaft assembly 110 and the pawl 121 respectively, and the structure is simple and reliable.

[0105] The inner ring portion 1221, the outer ring portion 1222, and the transition portion 1223 are all concentric ring structures with different diameters.

[0106] The transition sleeve 122, the central shaft assembly 110, the ratchet wheel 130, and the chainring sleeve 140 are coaxially distributed.

[0107] As Figure 4 and Figure 5 As shown, the avoidance openings 105 are located on the outer circumferential surface of the transition sleeve 122. The number of avoidance openings 105 is equal to that of the pawls 121, and their positions correspond one by one.

[0108] As Figure 3 and Figure 5 As shown, according to some alternative embodiments, the pawl assembly 120 further includes: an elastic member 124 and a stopper 123. The elastic member 124 is connected to the transition sleeve 122 and provides an elastic force, which is used to keep the pawl 121 in the state of snapping into the tooth socket; the stopper 123 is connected to the transition sleeve 122. Both the elastic member 124 and the pawl 121 are located between the stopper 123 and the transition sleeve 122, and the stopper 123 is used to fix the elastic member 124 and the pawl 121 to the transition sleeve 122.

[0109] The stopper 123 and the transition sleeve 122 together fix the elastic member 124 and the pawl 121.

[0110] Without limitation, the stopper 123 is a plastic part or a metal retaining ring.

[0111] The elastic member 124 can be a leaf spring or a spring, for example: a wire spring.

[0112] When assembling the pawl assembly 120, the pawl 121 and the elastic member 124 can be first installed on the transition sleeve 122, and then the stopper 123 is installed to fix the pawl 121 and the elastic member 124, making the pawl assembly 120 a whole. This modular structure facilitates the repair and replacement of the pawl assembly 120.

[0113] The elastic member 124 uses its elasticity to keep the pawl 121 in a fixed position, maintaining the state where the pawl 121 is engaged in the tooth socket, and providing a movable range for the pawl 121.

[0114] When the pawl 121 remains engaged in the tooth socket, it can drive the ratchet 130 and the chainring sleeve 140 to rotate when an external force is applied to the pawl 121 in a preset direction. At the same time, by using the movable range provided by the elastic member 124 for the pawl 121, when an external force is applied to the pawl 121 in a direction opposite to the preset direction, the pawl 121 can jump out of the tooth socket, enabling the pawl assembly 120 and the ratchet 130 to rotate relative to each other.

[0115] As Figure 4 shown, according to some alternative embodiments, the installation position is the installation groove 101, and both the elastic member 124 and the stopper 123 are installed in the installation groove 101; the axial end of the transition sleeve 122 has an opening 106 communicating with the installation groove 101, and the stopper 123 covers the opening 106 of the installation groove 101; the relief opening 105 is located on one circumferential side of the transition sleeve 122 and communicates with the installation groove 101.

[0116] As Figure 4 shown, the relief opening 105 and the opening 106 are respectively located on adjacent side surfaces of the transition sleeve 122.

[0117] After the stopper 123 covers the opening 106, the stopper 123 can press the elastic member 124 and the pawl 121 located in the installation groove 101, limiting the elastic member 124 and the pawl 121 between the stopper 123 and the bottom wall of the installation groove 101.

[0118] Without limitation, as Figure 4 shown, the elastic member 124 and the pawl 121 can be placed into the interior of the installation groove 101 through the opening 106.

[0119] The self-structures of the stopper 123 and the transition sleeve 122 can be used to fix multiple elastic members 124 and multiple pawls 121 simultaneously, and the fixing method is simple and convenient.

[0120] The bottom wall of the stopper 123 and the installation groove 101 are respectively used to limit the axial movement of the elastic member 124 and the pawl 121; the side wall of the installation groove 101 is used to limit the circumferential movement of the elastic member 124 and the pawl 121 along the transition sleeve 122.

[0121] As Figure 4 andFigure 5 As shown, according to some optional embodiments, the outer ring portion 1222 has a stopper portion 104 protruding toward the inner ring portion 1221; Figure 3 and Figure 4 As shown, the blocking member 123 is a blocking ring, and the blocking ring is located between the transition portion 1223 and the limiting portion 104 .

[0122] The limiting portion 104 has a limiting effect on the movement of the blocking member 123 along the axial direction thereof, thereby ensuring the fixing effect of the blocking member 123 on the pawl 121 and the elastic member 124 .

[0123] Take four claws (referring to four ratchets 121 installed on a transition sleeve 122, and the meanings of other names are similar) and six claws as examples. The difference between the two is that the same 100n.m torque is evenly distributed to the four ratchets 121, and each ratchet 121 bears a torque of 25n.m. Distributed to six ratchets 121, each ratchet 121 bears a torque of 16.6nm. Therefore, the more the number of ratchets 121, the greater the total torque it bears. However, when both four claws and six claws are evenly distributed in the same ratchet 121 transition sleeve 122 as shown in the figure, Figure 4 The width H shown at A (referring to the outer ring 1222 between two adjacent avoidance openings 105) is different (when the ratchet 121 is subjected to force, the force is almost concentrated here), and the width H corresponding to four claws is wider than the width corresponding to six claws. If the transition sleeve 122 of the same diameter is replaced with six claws, the width at A is too narrow to meet the requirements. Only by increasing the diameter of the outer ring 1222, the distance between the six ratchet claws 121 will be larger, so that the width at A can meet the requirements.

[0124] Since the pawls 121 are fixed on the middle shaft assembly 110, it is necessary to produce multiple torque sensors 180 according to the different numbers of pawls 121 (because the outer diameters are different for different numbers of pawls 121). In the disclosed embodiment, the pawls 121 are placed on a separate transition sleeve 122, and only the size of the transition sleeve 122 needs to be changed according to the number of pawls 121, without changing the structure of the middle shaft assembly 110, and multiple different specifications of pawl assemblies 120 can share the same middle shaft assembly 110.

[0125] like Figure 4 As shown, according to some optional embodiments, the mounting groove 101 has a first arcuate surface 103 , one end of the pawl 121 is connected to the arcuate surface, and the other end of the pawl 121 extends outward from the outer ring portion 1222 after passing through the avoidance opening 105 .

[0126] The end of the pawl 121 that contacts the first arcuate surface 103 also has an arcuate surface that matches the first arcuate surface 103. The pawl 121 and the groove wall of the installation groove 101 are connected through the arcuate surface. The two are fixed without the aid of screws or adhesives, and the installation method is simple and reliable.

[0127] Exemplarily, the installation groove 101 has a second arc surface 102. One end of the elastic member 124 is connected to the second arc surface 102, and the other end of the elastic member 124 is connected to the pawl 121.

[0128] The end of the elastic member 124 in contact with the second arc surface 102 also has an arc surface matching the second arc surface 102. The elastic member 124 and the groove wall of the installation groove 101 are connected through the arc surface, and the fixation of the two does not require the aid of screws or adhesives, etc., and the installation method is simple and reliable.

[0129] Without limitation, both the first arc surface 103 and the second arc surface 102 are circular arc surfaces.

[0130] As Figure 4 shown, the first arc surface 103 and the second arc surface 102 are respectively at opposite ends of the installation groove 101. One end of the elastic member 124 is embedded in the second arc surface 102, and the other end abuts against the pawl 121.

[0131] As Figure 4 and Figure 5 shown, according to some alternative embodiments, the inner ring portion 1221 has splines. The splines surround the shaft hole 1224 and form the hole wall of the shaft hole 1224. The inner ring portion 1221 is spline-connected to the central shaft assembly 110.

[0132] The transition sleeve 122 and the central shaft assembly 110 are spline-connected, which can make the force transmission between the two more uniform and the connection strength reliable.

[0133] Without limitation, the splines on the inner side of the inner ring portion 1221 are internal splines 1225, and the spline type is involute spline.

[0134] As Figure 1 shown, the central shaft assembly 110 includes: a central shaft 111, a shaft sleeve 112, and a torque sensor 180. The central shaft 111 is used to receive an external force; the shaft sleeve 112 is sleeved outside the central shaft and rotates with the rotation of the central shaft 111; the torque sensor 180 is connected to the shaft sleeve 112 to detect the torque of the shaft sleeve 112.

[0135] The central shaft 111, the shaft sleeve 112, and the torque sensor 180 are coaxially distributed.

[0136] Exemplarily, as Figure 1 shown, the shaft sleeve 112 is sleeved outside the central shaft, and the torque sensor 180 is sleeved outside the shaft sleeve 112.

[0137] The torque sensor 180 is used to detect the torque of the incoming shaft sleeve 112. For example, the torque sensor 180 determines the torque information of the rider's pedaling by detecting the deformation of the shaft sleeve 112. The controller 260 inside the mid-drive motor can obtain this torque information and control the output of the motor assembly 160 according to this torque information to achieve the required assistance effect.

[0138] As Figure 3 shown, the transition sleeve 122 is connected to the shaft sleeve 112, and the shaft sleeve 112 has an external spline 1121 that matches the internal spline 1225 of the inner ring portion 1221.

[0139] As Figures 8 to 10 shown, according to some alternative embodiments, the mid-drive motor further includes: a housing 200, a first connector 220, a second connector 210, a first sealing structure 230, and a second sealing structure 240. Among them, the housing 200 has a receiving space that at least houses the above-mentioned bottom bracket assembly 110, pawl assembly 120, ratchet 130, and chainring sleeve 140; the first connector 220 is fixed relative to the housing 200, and the first connector 220 is used to supply power to the mid-drive motor; the housing 200 has a through-hole 202 at the position corresponding to the first connector 220, and the first connector 220 at least partially passes through the through-hole 202; the second connector 210 is detachably electrically connected to the first connector 220 to transmit the power of the external power supply to the mid-drive motor through the first connector 220; the first sealing structure 230 is located between the first connector 220 and the hole wall of the through-hole 202; the second sealing structure 240 is located between the first sealing structure 230 and the second connector 210, and both the first sealing structure 230 and the second sealing structure 240 form a liquid seal between the first connector 220 and the hole wall of the through-hole 202.

[0140] The controller 260 referred to in the embodiments of the present disclosure includes a PCB (Printed Circuit Board).

[0141] The first connector 220 and the second connector 210 together form a connector. Among them, the first connector 220 can be the male end of the connector, and the second connector 210 is the female end of the connector.

[0142] The second connector 210 is electrically connected to the external power supply and the first connector 220 respectively, and the external power supply includes but is not limited to a battery.

[0143] As Figure 9As shown, the first sealing structure 230 and the second sealing structure 240 are arranged side by side along the axial direction of the through hole 202. Among them, the first sealing structure 230 is located below and is closer to the bottom of the through hole 202; the second sealing structure 240 is located above and is closer to the opening of the through hole 202. In this sealing method, the second sealing structure 240 serves as the first line of defense, and the first sealing structure 230 serves as the second line of defense. Even if there is liquid flowing towards the upper opening of the through hole 202, under the double protection of the second sealing structure 240 and the first sealing structure 230, the risk of liquid entering the through hole 202 can be reduced, and the protection effect on the components inside the housing 200 can be improved.

[0144] Generally, the mid-mounted motor further includes: a controller 260, and the controller 260 is located in the accommodation space; a first connector 220 is fixed on the controller 260 and is electrically connected to the controller 260. When the second connector 210 is connected to the first connector 220, it supplies power to the controller 260 at least.

[0145] Without limitation, the first connector 220 can be connected to the controller 260 by welding. For example: the first connector 220 includes a first connection terminal 222 electrically connected to the controller 260, the second connector 210 includes a second connection terminal. When the second connector 210 is connected to the first connector 220, the second connection terminal is electrically connected to the first connection terminal to supply power to the controller 260 at least; the first connection terminal 222 is welded to the wire on the controller 260.

[0146] The first connection terminal 222 and the second connection terminal can be in the form of a sheet structure, a needle structure, a conductive coating, etc. But it is not limited to this.

[0147] In the existing connection between the controller 260 and the connector, usually the controller 260 and the connector are fixed at different positions on the housing 200 respectively, and then they are connected by a patch cord. In the embodiment of the present disclosure, the first connector 220 is directly connected to the controller 260, reducing the use of an intermediate patch cord and avoiding product defects caused by damage to the patch cord, incorrect patch cord wire sequence, and incorrect patch cord installation. Since the patch cord and even the adapter board where the connector is located are reduced, the production efficiency and the yield rate will be improved in assembly. Moreover, in the embodiment of the present disclosure, the integration of the connector and the controller 260 board reduces the costs of materials, labor, etc. brought during production and assembly of the product, saving costs. Furthermore, this method will reduce the assembly of one or two components, so to a certain extent, the occupied space will be reduced, and the purpose of saving space is also achieved.

[0148] Such as Figure 9 and Figure 10As shown, according to some alternative embodiments, the first sealing structure 230 includes a sealing ring (e.g., an O-ring), which is sleeved outside the first joint 220 and is in interference fit with the pore wall of the through-hole 202. It can be understood that in addition to being installed outside the first joint 220, in embodiments not shown in the present disclosure, the sealing ring can also be installed on the pore wall of the through-hole 202 and is in interference fit with the first joint 220. Both of the above methods can achieve the sealing connection between the first sealing structure 230 and the pore wall of the through-hole 202 and the first joint 220 respectively to achieve the liquid sealing function.

[0149] As Figure 12 shown, the outer side of the first joint 220 has an annular groove 221, and the sealing ring is embedded in the annular groove 221. The annular groove 221 can be used to reduce the axial movement of the sealing ring along the first joint 220, ensuring the reliability of the installation of the sealing ring.

[0150] Exemplarily, as Figure 9 and Figure 10 shown, the second sealing structure 240 includes a sealant, which is a colloid formed by curing a liquid glue applied between the first joint 220 and the pore wall of the through-hole 202. For example: after the first joint 220 is inserted into the through-hole 202, a gap is reserved at the connection between the first joint 220 and the pore wall of the through-hole 202. A waterproof sealant (liquid glue) can be directly poured into the gap between the pore wall of the through-hole 202 and the first joint 220 using a sol gun. After the waterproof sealant naturally solidifies, it forms a sealant that can be used to isolate external moisture. Figure 10 The second sealing structure 240 in

[0151] In some embodiments, as Figure 9 and Figure 10 shown, a boss 204 is formed by the inward protrusion of the pore wall of the through-hole 202, and the sealant is at least partially located on the boss 204 and between the boss 204 and the first joint 220.

[0152] As Figure 9 shown, part of the sealant is located above the boss 204, and the other part is located downward from the upper direction of the boss 204 between the boss 204 and the first joint 220. The boss 204 can be used to carry the liquid glue, making the flow rate of the liquid glue controllable and forming a sealant near the boss 204. Moreover, part of the sealant is formed on the boss 204. When the second joint 210 is inserted and abuts against the sealant, due to the extrusion of the second joint 210 on the sealant, the sealant deforms, so that the sealing effect of the sealant can be improved. Not only that, when the second joint 210 is inserted and abuts against the sealant, the boss 204 can prevent the second joint 210 from continuing to descend, indicating that the second joint 210 and the first joint 220 are inserted in place.

[0153] As shown Figure 11 In the figure, there is a gap 201 between the first joint 220 and the hole wall of the via hole 202. The gap 201 is located above the second sealing structure 240. The second joint 210 is at least partially inserted into the gap 201 and abuts against the second sealing structure 240. This gap 201 provides space for the insertion of the second joint 210, facilitating the assembly of the second joint 210 and the first joint 220.

[0154] As shown Figure 9 In the figure, the via hole 202 is used to pass through the connector. The male end of the connector (referring to the first joint 220) passes from the inside of the housing 200 to the outside of the housing 200. After the housing 200 is assembled, a gap is reserved at the connection between the first joint 220 and the housing 200. On the one hand, this reserved gap makes it convenient to install the connector during assembly (i.e., the function of the gap), and on the other hand, it provides space for the second line of defense against water for the connector. After stretching the step 203 around the hole wall of the via hole 202, a waterproof sealant is directly poured into the gap between the housing 200 and the connector using a sol gun. After it naturally solidifies, a sealant is formed to isolate external moisture. When it is necessary to disassemble the first joint 220 for maintenance, just tear off the sealant.

[0155] As shown Figure 1 In the figure, the embodiment of the present disclosure also provides an assisted bicycle, which includes: a frame, a crank, a pedal, and the mid-drive motor described in any one of the above embodiments. The mid-drive motor is located on the frame. One end of the crank is connected to the bottom bracket assembly 110, and the other end of the crank is connected to the pedal.

[0156] The assisted bicycle according to the embodiment of the present disclosure can be driven only by human power, or only by the motor assembly 160, or by human power and the motor assembly 160 at the same time.

[0157] When motor drive is required (generally referring to the assist mode), turn on the power supply of the instrument. Apply pressure to the pedal with the foot, and the pedal drives the bottom bracket to rotate clockwise, thereby transmitting the torque to the torque sensor 180, and then driving the transition sleeve 122 to rotate. Since the ratchet pawl 121 on the transition sleeve 122 is in a closed state with the ratchet ring 130 at this time, the chainring sleeve 140 will be driven to rotate, and finally the torque will be transmitted to the chainring connected to the chainring sleeve 140, thereby driving the bicycle forward.

[0158] When driven purely by pedals (generally referring to the non-assisted mode), since the chainring sleeve 140 rotates actively, the one-way needle bearings therein are in a separated state, and the secondary driven gear will not rotate accordingly. At this time, the motor assembly 160 does not provide power. However, when a person pedals against the combined forces such as gravity and the friction between the rear wheel and the ground, due to the relatively large force, the sensor sleeve 112 of the torque sensor 180 will deform. At this time, the strain gauges on the sleeve 112 will deform accordingly, causing a change in the electrical signal. After receiving the electrical signal, the controller 260 will issue a command to make the entire system work, thereby driving the motor assembly 160 to work. When the motor assembly 160 works, the primary drive gear 162 rotates, and the primary driven gear 191 meshing with it will also rotate accordingly. Then, in sequence, the secondary drive gear 192 and the secondary driven gear follow. At this time, the secondary driven gear rotates actively, and the one-way needle clutch is in a closed state, which will transmit the torque to the chainring sleeve 140, thereby driving the chainring to the chain and then to the rear wheel, and the entire assisted bicycle moves forward.

[0159] As Figure 1 shown, the motor assembly 160 of the mid-mounted motor includes a rotor and a stator (also known as the core group 161). Based on the principle of electromagnetic induction, the rotor rotates under the action of the stator to output a driving force. The housing 200 also has an encoder 163, which can convert information such as the position and displacement physical quantities of the rotating components into digital pulse signals that can be transmitted, communicated, or stored.

[0160] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners included in the claims. Without departing from the scope of the present disclosure, various deformations and changes can also be made on the basis of the above embodiments. Similarly, the various technical features of the above embodiments can also be arbitrarily combined to form other embodiments of the present disclosure that may not be explicitly described. Therefore, the above embodiments only represent several implementation manners of the present disclosure and do not limit the protection scope of the present disclosure patent.

Claims

1. A mid-mounted motor, characterized in that: The mid-mounted motor comprises: A motor assembly (160) for generating a driving force; A transmission assembly (190) connected to the motor assembly (160) to transmit a driving force generated by the motor assembly (160); A middle shaft assembly (110) for receiving a driving force from the transmission assembly (190) or receiving an external force from a pedal; A pawl assembly (120) comprising a pawl (121) and a transition sleeve (122), wherein the pawl (121) is fixed to the transition sleeve (122), and the transition sleeve (122) is detachably connected to the middle shaft assembly (110) and can drive the pawl (121) to rotate under the rotation of the middle shaft assembly (110); The ratchet wheel (130) has a tooth groove along its circumference, the ratchet pawl (121) is inserted into the tooth groove, and the ratchet wheel (130) can rotate along the preset direction under the action of the ratchet pawl (121) rotating along the preset direction; A toothed disc sleeve (140) fixedly connected to the ratchet wheel (130), the toothed disc sleeve (140) being capable of rotating under the rotation of the ratchet wheel (130) along the preset direction; A housing (200) having a receiving space, the receiving space at least receiving the middle shaft assembly (110), the pawl assembly (120), the ratchet wheel (130) and the toothed disc sleeve (140); A first connector (220) is fixed relative to the housing (200), the first connector (220) being used to supply power to the central motor; the housing (200) has a through hole (202) at a position corresponding to the first connector (220), and the first connector (220) at least partially passes through the through hole (202); A second connector (210) is detachably electrically connected to the first connector (220) so as to transmit power from an external power source to the central motor via the first connector (220); A first sealing structure (230) is located between the first joint (220) and the hole wall of the via hole (202); The second sealing structure (240) is located between the first sealing structure (230) and the second joint (210), and the first sealing structure (230) and the second sealing structure (240) both form a liquid seal between the first joint (220) and the hole wall of the via hole (202).

2. The mid-mounted motor according to claim 1, characterized in that: The transition sleeve (122) is an annular member; The annular transition sleeve (122) comprises: an inner ring portion (1221), an outer ring portion (1222), and a transition portion (1223) located between the outer ring portion (1222) and the inner ring portion (1221); the inner ring portion (1221) has an axial hole (1224) for the middle shaft assembly (110) to pass through; The transition portion (1223) has a mounting position, and the mounting position is at least used to mount the pawl (121); The outer ring portion (1222) has a plurality of avoidance openings (105) spaced apart along its circumference; the ratchet (121) passes through the avoidance openings (105) to be engaged with the tooth socket.

3. The mid-mounted motor according to claim 2, characterized in that: The pawl assembly (120) further includes: An elastic member (124) connected to the transition sleeve (122) and providing an elastic force, wherein the elastic force is used to keep the pawl (121) in a state of being stuck in the tooth socket; A stopper (123) is connected to the transition sleeve (122); the elastic member (124) and the pawl (121) are both located between the stopper (123) and the transition sleeve (122); the stopper (123) is used to fix the elastic member (124) and the pawl (121) to the transition sleeve (122).

4. The mid-mounted motor according to claim 3, characterized in that: The installation position is a mounting groove (101), and the elastic member (124) and the blocking member (123) are both installed in the mounting groove (101); An axial end portion of the transition sleeve (122) has an opening (106) communicating with the installation groove (101), and the stopper (123) covers the opening (106) of the installation groove (101); The avoidance opening (105) is located on one side of the circumference of the transition sleeve (122) and is in communication with the installation groove (101).

5. The mid-mounted motor according to claim 4, characterized in that: The mounting groove (101) has a first arcuate surface (103), one end of the pawl (121) is connected to the arcuate surface, and the other end of the pawl (121) passes through the avoidance opening (105) and then extends outward from the outer ring portion (1222).

6. The mid-mounted motor according to claim 4 or 5, characterized in that: The mounting groove (101) has a second arc-shaped surface (102), one end of the elastic member (124) is connected to the second arc-shaped surface (102), and the other end of the elastic member (124) is connected to the pawl (121).

7. The mid-mounted motor according to claim 4 or 5, characterized in that: The outer ring portion (1222) has a limiting portion (104) protruding toward the inner ring portion (1221); the blocking member (123) is a retaining ring, and the retaining ring is located between the transition portion (1223) and the limiting portion (104).

8. The mid-mounted motor according to claim 2, characterized in that: The inner ring portion (1221) has a spline, the spline surrounds the shaft hole (1224) and forms a hole wall of the shaft hole (1224), and the inner ring portion (1221) is spline-connected to the middle shaft assembly (110).

9. The mid-mounted motor according to claim 1, characterized in that: The mid-mounted motor also includes: A one-way rotating member (170) connected to the transmission assembly (190) and the crankset sleeve (140) respectively; When the toothed disc sleeve (140) rotates under the action of the ratchet wheel (130), the interior of the one-way rotating member (170) is in a separated state; When the transmission assembly (190) drives the one-way rotating member (170) to rotate, the interior of the one-way rotating member (170) is in a coupled state, and the toothed disc sleeve (140) rotates under the action of the one-way rotating member (170).

10. The mid-mounted motor according to claim 1 or 9, characterized in that: The toothed disc sleeve (140) is threadedly connected to the ratchet (130), and the locking direction of the threaded connection is the same as the rotation direction of the toothed disc sleeve (140) when outputting a driving force.

11. The mid-mounted motor according to claim 1 or 9, characterized in that: The middle shaft assembly (110) comprises: A central axis (111) for receiving external force; A shaft sleeve (112) is sleeved on the outside of the middle shaft (111) and rotates along with the rotation of the middle shaft (111); A torque sensor (180) is connected to the shaft sleeve (112) to detect the torque of the shaft sleeve (112).

12. The mid-mounted motor according to claim 1, characterized in that: The mid-mounted motor also includes: A controller (260), located in the accommodation space; The first connector (220) is fixed on the controller (260) and is electrically connected to the controller (260); when the second connector (210) is connected to the first connector (220), it at least supplies power to the controller (260).

13. The mid-mounted motor according to claim 12, characterized in that: The first connector (220) comprises a first connection terminal (222) electrically connected to the controller (260), and the second connector (210) comprises a second connection terminal, and when the second connector (210) is connected to the first connector (220), the second connection terminal is electrically connected to the first connection terminal (222) to at least supply power to the controller (260); The first connection terminal (222) is welded to a wire on the controller (260).

14. The mid-mounted motor according to claim 1, characterized in that: The first sealing structure (230) comprises a sealing ring, which is mounted on the first joint (220) and is interference-fitted with the hole wall of the via hole (202); or, the sealing ring is mounted on the hole wall of the via hole (202) and is interference-fitted with the first joint (220).

15. The mid-mounted motor according to claim 1 or 14, characterized in that: The second sealing structure (240) comprises a sealant, which is a colloid formed by solidifying a liquid glue applied between the first joint (220) and the hole wall of the via hole (202).

16. The mid-mounted motor according to claim 15, characterized in that: The hole wall of the through hole (202) protrudes inwardly to form a boss (204), and the sealant is at least partially located on the boss (204) and between the boss (204) and the first joint (220).

17. The mid-mounted motor according to claim 1, characterized in that: A gap (201) is provided between the first joint (220) and the hole wall of the via hole (202), the gap (201) being located above the first sealing structure (230), and the second joint (210) being at least partially inserted into the gap (201) and abutting against the second sealing structure (240).

18. A power-assisted bicycle, characterized in that: The power-assisted bicycle comprises: Frame; The mid-mounted motor according to any one of claims 1 to 17, wherein the mid-mounted motor is located on the vehicle frame; A crank, one end of which is connected to the middle shaft assembly (110), and the other end of which is connected to a pedal.

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