Ratchet device, middle motor and electric moped

Abstract

The utility model belongs to the technical field of electric mopeds, and discloses a ratchet device, a middle motor and an electric moped. The ratchet wheel device comprises a ratchet wheel outer ring, a rotating body, a plurality of first ratchets and a plurality of second ratchets, the ratchet wheel outer ring is provided with a ratchet groove and used for being matched with the power output end of the middle motor, and the rotating body is rotatably installed in the ratchet groove and matched with a middle shaft of the middle motor. The multiple first ratchets and the multiple second ratchets are installed on the rotating body and evenly distributed in the circumferential direction of the rotating body at intervals. When one of the first ratchet and the second ratchet is completely meshed with the ratchet groove, one part of the other one of the first ratchet and the second ratchet extends into the ratchet groove, and the other part of the other one of the first ratchet and the second ratchet is located on the outer side of the ratchet groove. According to the ratchet device, external force borne by each ratchet can be reduced, and the service life of the ratchet device can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric assist vehicles, in particular to a ratchet device, a mid-mounted motor and an electric assist vehicle. Background Art

[0002] Ratchet mechanisms are widely used in various mechanical devices, such as various industrial machinery, vehicles, automation devices, medical equipment, etc. Among them, ratchet mechanisms have important applications in the handbrake system, automatic transmission, seat adjustment, etc. of automobiles. At present, electric assist vehicles have become common social transportation tools. As a one-way drive structure between the power output end of the mid-mounted motor of the electric assist vehicle and the central shaft, the ratchet mechanism can preferably prevent the normal driving of the electric assist vehicle from being affected when the motor or the central shaft rotates in reverse. The existing electric assist vehicles will generate huge torques when the torque changes. Therefore, after long-term operation, the wear of the pawls of the ratchet mechanism is relatively serious, thus shortening the service life of the ratchet mechanism. Content of the Utility Model

[0003] The first object of the utility model is to provide a ratchet device which can reduce the external force received by each tooth and is beneficial to prolong the service life of the ratchet device.

[0004] The second object of the utility model is to provide a mid-mounted motor with better reliability and longer service life.

[0005] The third object of the utility model is to propose an electric assist vehicle with better reliability and higher user satisfaction.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The utility model discloses a ratchet device which is used for a mid-mounted motor. The ratchet device comprises: a ratchet outer ring which has a tooth groove and is used for cooperating with the power output end of the mid-mounted motor; a rotating body which is rotatably installed in the tooth groove and cooperates with the central shaft of the mid-mounted motor; a plurality of first teeth and a plurality of second teeth which are both installed on the rotating body, and the plurality of first teeth and the plurality of second teeth are evenly distributed at intervals along the circumferential direction of the rotating body; wherein: when one of the first tooth and the second tooth is completely engaged with the tooth groove, a part of the other one of the first tooth and the second tooth extends into the tooth groove, and the other part is located outside the tooth groove.

[0008] In some embodiments, when one of the first ratchet and the second ratchet is fully engaged with the ratchet groove, the length that the other one of the first ratchet and the second ratchet extends into the ratchet groove is half of the total length of the ratchet.

[0009] In some embodiments, both the first ratchet and the second ratchet include a ratchet body and an elastic snap spring. An installation groove is provided on the outer peripheral wall of the rotating body. The ratchet body and the elastic snap spring are both installed in the installation groove. One end of the ratchet body is rotatably installed on the side wall of the installation groove, one end of the elastic snap spring is rotatably installed on the side wall of the installation groove, and the other end abuts against the other end of the ratchet body. The elastic snap spring is used to drive the ratchet body to rebound to a position engaged with the ratchet groove.

[0010] In some embodiments, a plurality of installation structures are provided on the outer peripheral wall of the outer ring of the ratchet, and the installation structures are used to cooperate with the power output end.

[0011] In some specific embodiments, the installation structure is formed as an installation ear protruding radially outward along the outer ring of the ratchet. The installation ear has an installation hole, and an installation member passes through the installation hole and cooperates with the power output end.

[0012] In some embodiments, a sprocket and an inner ring of the ratchet are provided on the rotating body. The ratchet device further includes a ratchet sleeve. The outer side of the ratchet sleeve has a third ratchet that cooperates with the inner ring of the ratchet. The ratchet sleeve cooperates with the central shaft and can rotate synchronously with the central shaft.

[0013] In some specific embodiments, a spline groove is provided on one of the ratchet sleeve and the central shaft, and a spline tooth that cooperates with the spline groove is provided on the other one of the ratchet sleeve and the central shaft.

[0014] In some specific embodiments, a torque detection device is provided on the outer side of the ratchet sleeve, and the torque detection device is used to detect the torque received by the central shaft.

[0015] The utility model discloses a mid-mounted motor, which includes a housing, a motor stator, a motor rotor, a transmission component, a central shaft, and the ratchet device described above. The motor stator is fixed inside the housing, and the motor rotor is installed inside the housing and is coaxially arranged with the motor stator; the power input end of the transmission component cooperates with the motor rotor, the power output end of the transmission component is connected to the outer ring of the ratchet of the ratchet device, and the central shaft cooperates with the rotating body.

[0016] The present utility model also discloses an electric power-assisted vehicle, which includes a vehicle body and the mid-mounted motor described above. The mid-mounted motor is installed on the vehicle body, and pedals are provided at both ends of the central axis of the mid-mounted motor.

[0017] Beneficial effects of the ratchet device of the present utility model: The multiple ratchet teeth on the rotating body are divided into two groups, namely the first ratchet teeth and the second ratchet teeth. When one of the first ratchet teeth and the second ratchet teeth is working (fully engaged with the ratchet slot), and the other of the first ratchet teeth and the second ratchet teeth is in a state of about to work (partially engaged with the ratchet slot), in this way, when the rotational speed of the outer ring of the ratchet suddenly changes, both the first ratchet teeth and the second ratchet teeth can be stressed. Compared with the prior art where only one group of ratchet teeth is stressed, the first ratchet teeth and the second ratchet teeth in this embodiment can jointly share the huge torque generated when the torsion of the central axis changes, which is beneficial to reducing the external force received by the first ratchet teeth and the second ratchet teeth and is beneficial to extending the service life of the ratchet device.

[0018] Beneficial effects of the mid-mounted motor of the present utility model: Due to having the ratchet device described above, the mid-mounted motor has better reliability and a longer working life.

[0019] Beneficial effects of the electric power-assisted vehicle of the present utility model: Due to having the mid-mounted motor described above, the electric power-assisted vehicle has better reliability and a higher user satisfaction.

[0020] Additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the ratchet device according to an embodiment of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the ratchet device in another direction according to an embodiment of the present utility model;

[0023] Figure 3 is a schematic structural diagram of the outer ring of the ratchet according to an embodiment of the present utility model;

[0024] Figure 4 is a schematic structural diagram of the rotating body, the first ratchet teeth and the second ratchet teeth according to an embodiment of the present utility model;

[0025] Figure 5 is a schematic structural diagram of the rotating body, the ratchet sleeve and the central axis according to an embodiment of the present utility model.

[0026] Reference Signs:

[0027] 100, outer ratchet ring; 110, ratchet tooth groove; 120, mounting ear; 121, mounting hole; 200, rotating body; 210, chainring; 300, first ratchet tooth; 400, second ratchet tooth; 500, ratchet sleeve; 510, third ratchet tooth; 520, spline groove; 600, bottom bracket; 610, spline tooth. Specific Embodiment

[0028] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0029] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0031] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] The present utility model discloses a ratchet device, and the ratchet device is used for a mid-drive motor. Refer to Figures 1 - 4As shown in the figure, the ratchet device includes a ratchet outer ring 100, a rotating body 200, a plurality of first ratchet teeth 300 and a plurality of second ratchet teeth 400. The ratchet outer ring 100 has a ratchet tooth groove 110. The ratchet outer ring 100 is used to cooperate with the power output end of the mid-mounted motor. The rotating body 200 is rotatably installed in the ratchet tooth groove 110. The rotating body 200 cooperates with the central shaft 600 of the mid-mounted motor. The plurality of first ratchet teeth 300 and the plurality of second ratchet teeth 400 are both installed on the rotating body 200, and the plurality of first ratchet teeth 300 and the plurality of second ratchet teeth 400 are evenly distributed at intervals along the circumference of the rotating body 200. When one of the first ratchet teeth 300 and the second ratchet teeth 400 is fully engaged with the ratchet tooth groove 110, a part of the other of the first ratchet teeth 300 and the second ratchet teeth 400 extends into the ratchet tooth groove 110, and the other part is located outside the ratchet tooth groove 110.

[0033] It should be noted that when the input force of the mid-mounted motor acts on the ratchet outer ring 100, the ratchet outer ring 100 starts to rotate and transmits the force to the rotating body 200. The first ratchet tooth 300 or the second ratchet tooth 400 can be selectively inserted into or disengaged from the ratchet tooth groove 110 of the ratchet outer ring 100 to control the movement of the entire mechanism. When the ratchet outer ring 100 rotates forward, the ratchet teeth can be inserted into the ratchet tooth groove 110, and the tooth shape of the ratchet teeth fits perfectly with the ratchet tooth groove 110, and the output force can be transmitted to the central shaft 600, thus realizing power transmission. When the ratchet outer ring 100 rotates in reverse, the ratchet teeth will disengage from the ratchet tooth groove 110, and the output force cannot be transmitted to the central shaft 600.

[0034] It can be understood that in this embodiment, the multiple ratchet teeth on the rotating body 200 are divided into two groups, namely the first ratchet teeth 300 and the second ratchet teeth 400. When one of the first ratchet teeth 300 and the second ratchet teeth 400 is working (fully engaged with the ratchet tooth groove 110), and the other of the first ratchet teeth 300 and the second ratchet teeth 400 is in a state of about to work (partially engaged with the ratchet tooth groove 110), in this way, when the rotational speed of the ratchet outer ring 100 suddenly changes, both the first ratchet teeth 300 and the second ratchet teeth 400 can be stressed. Compared with the prior art in which only one group of ratchet teeth is stressed, the first ratchet teeth 300 and the second ratchet teeth 400 in this embodiment can jointly share the huge torque generated when the torque of the central shaft 600 changes, which is beneficial to reducing the external force received by the first ratchet teeth 300 and the second ratchet teeth 400 and is beneficial to extending the service life of the ratchet device.

[0035] Reference Figure 2 As shown in the figure, when one of the first ratchet teeth 300 and the second ratchet teeth 400 is fully engaged with the ratchet tooth groove 110, the length of the other of the first ratchet teeth 300 and the second ratchet teeth 400 extending into the ratchet tooth groove 110 is half of the total length of the ratchet teeth. Thus, the first ratchet tooth 300 or the second ratchet tooth 400 in the state of about to work can better share the torque, which is beneficial to extending the service life of the ratchet device.

[0036] Optionally, both the first ratchet 300 and the second ratchet 400 include a ratchet body and an elastic retaining spring (not shown in the figure). An installation groove is provided on the outer peripheral wall of the rotating body 200. The ratchet body and the elastic retaining spring are both installed in the installation groove. One end of the ratchet body is rotatably installed on the side wall of the installation groove, one end of the elastic retaining spring is rotatably installed on the side wall of the installation groove, and the other end abuts against the other end of the ratchet body. The elastic retaining spring is used to drive the ratchet body to rebound to a position meshed with the ratchet groove 110. It can be understood that the elastic retaining spring is a common mechanical component, and its main function is to limit or determine the movement range of mechanical components to ensure that they work within a predetermined position or stroke range. Specifically, for the elastic retaining spring in this embodiment, its functions mainly include positioning, preventing detachment, and maintaining tension to ensure the stable operation of the first ratchet 300 and the second ratchet 400.

[0037] A plurality of installation structures are provided on the outer peripheral wall of the ratchet outer ring 100 and are spaced apart from each other along its circumferential direction. The installation structures are used to cooperate with the power output end. It can be understood that fixing the ratchet outer ring 100 on the power output end through the plurality of installation structures on its outer peripheral wall is beneficial to improving the connection stability between the two, so as to ensure that the mid-mounted motor can stably assist the rotation of the middle shaft 600 during actual operation.

[0038] Optionally, as shown in Figure 3 the figure, the installation structure is formed as an installation ear 120 protruding radially outward from the ratchet outer ring 100. The installation ear 120 has an installation hole 121, and the installation part passes through the installation hole 121 and cooperates with the power output end. It can be understood that fixing the ratchet outer ring 100 to the power output end of the mid-mounted motor by passing a plurality of installation parts through the installation hole 121 is convenient for the connection between the two on the one hand, and beneficial to improving the connection stability between the two on the other hand, so as to ensure that the mid-mounted motor can stably assist the rotation of the middle shaft 600 during actual operation. Of course, in other embodiments of the present invention, the installation structure can also be formed as a welding boss, and the ratchet outer ring 100 is directly welded to the power output end. The specific form of the installation structure can be adjusted according to actual needs.

[0039] As shown in Figure 5As shown in the figure, a chainring 210 and an inner ratchet ring are provided on the rotating body 200. The ratchet device further includes a ratchet sleeve 500. The outer side of the ratchet sleeve 500 has third ratchet teeth 510 that cooperate with the inner ratchet ring. The ratchet sleeve 500 cooperates with the central shaft 600 and can rotate synchronously with the central shaft 600. It can be understood that during the user's cycling, when the user drives the pedal to make the central shaft 600 rotate forward, the third ratchet teeth 510 are locked with the inner ratchet ring, and the central shaft 600 can drive the rotating body 200 to rotate, so that the chainring 210 rotates, thereby making the wheels of the electric assisted bicycle rotate forward and the electric assisted bicycle move forward. During the forward movement, if the mid-drive motor receives a signal to rotate forward to drive the outer ratchet ring 100 to rotate forward as well, at this time the outer ratchet ring 100 is locked with the first ratchet teeth 300 or the second ratchet teeth 400, and the outer ratchet ring 100 can drive the rotating body 200 to rotate, thereby enabling the mid-drive motor to assist the central shaft 600 to rotate. If the mid-drive motor fails and rotates in reverse, due to the one-way drive function of the outer ratchet ring 100 and the first ratchet teeth 300 or the second ratchet teeth 400, the reverse-rotating mid-drive motor cannot drive the rotating body 200 to rotate in reverse, thus avoiding the riding resistance caused by the reverse rotation of the mid-drive motor. If during the forward rotation of the mid-drive motor, the pedal drives the central shaft 600 to rotate in reverse, due to the one-way drive function of the third ratchet teeth 510 and the inner ratchet ring, the reverse rotation of the central shaft 600 will not drive the rotating body 200 to rotate in reverse. At this time, the central shaft 600 is in an idle state, avoiding the riding resistance caused by the reverse rotation of the pedal. In addition, when pushing the electric assisted bicycle to reverse, the chainring 210 will rotate in reverse, thereby making the rotating body 200 rotate in reverse. The reverse-rotating rotating body 200 can neither drive the central shaft 600 to rotate in reverse nor drive the motor rotor to rotate in reverse, ensuring the safety of reversing.

[0040] As described above, the outer ratchet ring 100, the first ratchet teeth 300, the second ratchet teeth 400, the inner ratchet ring and the third ratchet teeth 510 constitute a double-layer one-way drive mechanism, ensuring that the reverse rotation of any component will not affect the normal operation of the electric assisted bicycle, which is beneficial to improving the working reliability of the electric assisted bicycle.

[0041] Reference Figure 5 As shown in the figure, the ratchet sleeve 500 is provided with a spline groove 520, and the central shaft 600 is provided with spline teeth 610 that cooperate with the spline groove 520. It can be understood that the cooperation between the spline groove 520 and the spline teeth 610 can improve the connection stability between the central shaft 600 and the ratchet sleeve 500, avoiding relative rotation between the two, thereby ensuring the stable operation of the mid-drive motor. Of course, in an alternative embodiment, the ratchet sleeve 500 is provided with spline teeth 610, and the central shaft 600 is provided with a spline groove 520. In addition, in other embodiments of the present invention, the ratchet sleeve 500 and the central shaft 600 can also be connected through connection structures such as fixing pins, interference fits, flat keys, etc., which are not limited to the above description.

[0042] Optionally, a torque detection device (not shown in the figure) is provided on the outer side of the ratchet sleeve 500. The torque detection device is used to detect the torque applied to the central shaft 600. It can be understood that during the rotation of the central shaft 600, the torque detection device installed on the ratchet sleeve 500 can detect the torque applied to the central shaft 600. The control system of the electric assist vehicle can adjust the assist force provided by the mid-drive motor to the user according to the detection result of the torque detection device. Compared with the prior art where a torque detection sensor is additionally provided outside the mid-drive motor to detect the user's riding torque, in this embodiment, the torque detection device is installed on the ratchet sleeve 500. On the one hand, it is convenient for wiring, and on the other hand, it is convenient to accurately detect the torque applied to the central shaft 600.

[0043] The present utility model discloses a mid-drive motor, which includes a housing, a motor stator, a motor rotor, a transmission component, a central shaft 600, and the aforementioned ratchet device. The motor stator is fixed inside the housing, and the motor rotor is installed inside the housing and coaxially arranged with the motor stator; the power input end of the transmission component is engaged with the motor rotor, and the power output end of the transmission component is connected to the outer ring 100 of the ratchet of the ratchet device, and the central shaft 600 is engaged with the rotating body 200. Due to the aforementioned ratchet device, the reliability of this mid-drive motor is relatively good and the working life is relatively long.

[0044] It should be added that the motor stator, motor rotor, and transmission component of the mid-drive motor are all prior arts and can be selected according to the prior arts. The specific descriptions of the above structures will not be provided here.

[0045] The present utility model also discloses an electric assist vehicle, which includes a vehicle body and the aforementioned mid-drive motor. The mid-drive motor is installed on the vehicle body, and pedals are provided at both ends of the central shaft 600 of the mid-drive motor. Due to the aforementioned mid-drive motor, the reliability of this electric assist vehicle is relatively good and the user satisfaction is relatively high.

[0046] In the description of this specification, the descriptions referring to terms "some embodiments", "other embodiments", etc. mean 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 utility model. In this specification, the schematic representations of the above terms do 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.

[0047] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A ratchet device, characterized in that, The ratchet device is used for a mid-mounted motor, and the ratchet device includes: A ratchet outer ring (100), the ratchet outer ring (100) has ratchet teeth grooves (110), and the ratchet outer ring (100) is used to cooperate with the power output end of the mid-mounted motor; A rotating body (200), the rotating body (200) is rotatably installed in the ratchet teeth grooves (110), and the rotating body (200) cooperates with the central shaft (600) of the mid-mounted motor; A plurality of first ratchet teeth (300) and a plurality of second ratchet teeth (400), the plurality of first ratchet teeth (300) and the plurality of second ratchet teeth (400) are both installed on the rotating body (200), and the plurality of first ratchet teeth (300) and the plurality of second ratchet teeth (400) are evenly distributed at intervals along the circumferential direction of the rotating body (200); wherein: When one of the first ratchet teeth (300) and the second ratchet teeth (400) is fully engaged with the ratchet teeth grooves (110), a part of the other of the first ratchet teeth (300) and the second ratchet teeth (400) extends into the ratchet teeth grooves (110), and the other part is located outside the ratchet teeth grooves (110).

2. The ratchet device according to claim 1, wherein, When one of the first ratchet teeth (300) and the second ratchet teeth (400) is fully engaged with the ratchet teeth grooves (110), the length of the other of the first ratchet teeth (300) and the second ratchet teeth (400) extending into the ratchet teeth grooves (110) is half of the total length of the ratchet teeth.

3. The ratchet device according to claim 1, characterized in that, Both the first ratchet teeth (300) and the second ratchet teeth (400) include ratchet tooth bodies and elastic retaining rings. An installation groove is provided on the outer peripheral wall of the rotating body (200). The ratchet tooth bodies and the elastic retaining rings are both installed in the installation groove. One end of the ratchet tooth body is rotatably installed on the side wall of the installation groove, one end of the elastic retaining ring is rotatably installed on the side wall of the installation groove, and the other end abuts against the other end of the ratchet tooth body. The elastic retaining ring is used to drive the ratchet tooth body to rebound to a position engaged with the ratchet teeth grooves (110).

4. The ratchet device according to claim 1, wherein, A plurality of installation structures are provided on the outer peripheral wall of the ratchet outer ring (100) at intervals along its circumferential direction, and the installation structures are used to cooperate with the power output end.

5. The ratchet device according to claim 4, characterized in that, The installation structure is formed as an installation ear (120) protruding radially outward along the ratchet outer ring (100). The installation ear (120) has an installation hole (121), and an installation piece passes through the installation hole (121) and cooperates with the power output end.

6. The ratchet device according to claim 1, characterized in that, A chainring (210) and a ratchet inner ring are provided on the rotating body (200). The ratchet device further includes a ratchet sleeve (500). The outer side of the ratchet sleeve (500) has third ratchet teeth (510) that cooperate with the ratchet inner ring. The ratchet sleeve (500) cooperates with the central shaft (600) and can rotate synchronously with the central shaft (600).

7. The ratchet device according to claim 6, characterized in that, A spline groove (520) is provided on one of the ratchet sleeve (500) and the central shaft (600), and spline teeth (610) mating with the spline groove (520) are provided on the other of the ratchet sleeve (500) and the central shaft (600).

8. The ratchet device according to claim 6, characterized in that, A torque detection device is provided on the outer side of the ratchet sleeve (500), and the torque detection device is used to detect the torque received by the central shaft (600).

9. A mid-mounted motor, characterized in that, It includes a housing, a motor stator, a motor rotor, a transmission assembly, a central shaft (600), and a ratchet device according to any one of claims 1-8. The motor stator is fixed inside the housing, the motor rotor is installed inside the housing and is coaxially arranged with the motor stator; the power input end of the transmission assembly is matched with the motor rotor, the power output end of the transmission assembly is connected to the ratchet outer ring (100) of the ratchet device, and the central shaft (600) is matched with the rotating body (200).

10. An electric assisted vehicle, characterized in that, It includes a vehicle body and a mid-mounted motor according to claim 9. The mid-mounted motor is installed on the vehicle body, and pedals are provided at both ends of the central shaft (600) of the mid-mounted motor.

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