Multi-gear middle drive motor and gear shifting method therefor

Abstract

A multi-gear middle drive motor and a gear shifting method therefor. The middle drive motor comprises a middle shaft (1), a sleeve shaft (3), an auxiliary shaft (2), a pedal power input unit, a power-assisted input unit, a transmission speed reduction gear (7), a second one-way clutch (20), and a first one-way clutch (10); the pedal power input unit is fixedly connected to the left end and the right end of the middle shaft (1) and transmits driving power to the middle shaft (1); and the power-assisted input unit transmits driving power to a transition gear (4) by means of the transmission speed reduction gear (7). In the gear shifting method for the multi-gear middle drive motor, one-way clutches are combined with ratchet wheels, so that multiple gear positions are realized; the middle drive motor is compact and simple in structure, and stable in operation; and the defect that high-speed operation and various torque outputs are not facilitated due to the low transmission speed of existing middle drive motors is overcome.

Description

A multi-gear mid-mounted motor and shifting method thereof Technical Field

[0001] The present invention relates to the field of mid-mounted electric motors, and more particularly to a multi-gear mid-mounted electric motor and a gear shifting method thereof. Background Art

[0002] Bicycles, also known as pedal bikes or single vehicles, have two types of transmission speed ratios: fixed and adjustable. Typically, bicycles are driven by a pedal power input unit. Most bicycles include a central axle with pedal power input units installed at either end. A smaller number of bicycles utilize a combined power input unit, such as the "three-speed mid-mounted motor with automatic shifting" disclosed in Application Publication No. 113859419A. However, this motor only has three gears, resulting in a relatively low transmission speed, which is not conducive to high-speed operation and stable output of various torques.

[0003] Summary of the Invention

[0004] The first purpose of the present invention is to provide a multi-gear mid-mounted motor with a compact and simple structure and stable operation, thereby overcoming the defects of existing mid-mounted motors in that the transmission speed is relatively low, which is not conducive to high-speed operation and stable output of multiple torques.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides a multi-speed mid-mounted motor, including a middle shaft, an auxiliary shaft, a pedal power input unit, a power-assist input unit and a transmission reduction gear, wherein the pedal power input unit is fixedly connected to the left and right ends of the middle shaft to transmit the driving power to the middle shaft; the power-assist input unit transmits the driving power to the transition gear through the transmission reduction gear, and also includes a sleeve shaft, a first one-way clutch and a second one-way clutch, the left section of the middle shaft is sleeved with a second-gear middle shaft gear, the second-gear middle shaft gear and the middle shaft are connected by the first one-way clutch; the sleeve shaft is sleeved on the right section of the middle shaft on the right side of the second-gear middle shaft gear; the sleeve shaft is equipped with at least a first sliding double-ratchet ratchet, a first-gear middle shaft gear and an output sprocket from left to right, wherein the output sprocket is fixedly connected to the sleeve shaft, the first-gear middle shaft gear and the sleeve shaft are connected by a third one-way clutch, and the first sliding double-ratchet ratchet is slidably sleeved on the sleeve shaft;

[0006] The auxiliary shaft is equipped with at least a second-gear auxiliary shaft gear, a transition gear, and a first-gear auxiliary shaft gear from left to right, wherein the first-gear auxiliary shaft gear and the second-gear auxiliary shaft gear are fixedly connected to the auxiliary shaft, and the transition gear and the secondary central shaft are connected via the second one-way clutch;

[0007] When the first sliding double-ratchet ratchet wheel slides to the left, it engages with the ratchet teeth of the second-gear middle shaft gear, transmitting the power from the middle shaft to the sleeve shaft.

[0008] By adopting the above technical solution, multiple gears can run more smoothly and the relative output transmission speed is relatively high. At the same time, the structure adopts the method of directly driving the reduction gear and the transition gear with the electric motor, which has a compact and simple structure and higher transmission efficiency.

[0009] It is further defined that the multi-speed shifting mid-mounted motor is a seven-speed mid-mounted motor, and the sleeve shaft is equipped with a first sliding double ratchet, a fifth-speed middle shaft gear, a fourth-speed middle shaft gear, a seventh-speed middle shaft gear, a first-speed middle shaft gear, a third-speed middle shaft gear, a sixth-speed middle shaft gear and an output sprocket in sequence from left to right; wherein, the output sprocket is fixedly connected to the sleeve shaft, and the first-speed middle shaft gear and the sleeve shaft are connected via a third one-way clutch; the fifth-speed middle shaft gear, the fourth-speed middle shaft gear, the seventh-speed middle shaft gear, the third-speed middle shaft gear and the sixth-speed middle shaft gear are fixedly sleeved on the sleeve shaft; the first sliding double ratchet is slidably sleeved on the sleeve shaft; the auxiliary The shaft is equipped with the second gear auxiliary shaft gear, the transition gear, the fifth gear auxiliary shaft gear, the fourth gear auxiliary shaft gear, the second sliding double ratchet, the seventh gear auxiliary shaft gear, the first gear auxiliary shaft gear, the third gear auxiliary shaft gear, the third sliding double ratchet and the sixth gear auxiliary shaft gear from left to right; wherein, the first gear auxiliary shaft gear and the second gear auxiliary shaft gear are fixedly connected to the auxiliary shaft, and the transition gear and the secondary middle shaft are connected by a second one-way clutch; the second sliding double ratchet and the third sliding double ratchet are both slidably sleeved on the auxiliary shaft, and the fifth gear auxiliary shaft gear, the fourth gear auxiliary shaft gear, the seventh gear auxiliary shaft gear, the third gear auxiliary shaft gear and the sixth gear auxiliary shaft gear are loosely sleeved on the auxiliary shaft.

[0010] Furthermore, the pedal power input unit is a pedal, the power input unit is an electric motor, the electric motor includes a motor output shaft and a motor output gear, the motor output gear is fixed on the motor output shaft, and the motor output gear transmits power to the transmission reduction gear to the transition gear. The pedal and the motor are power sources with stable performance, wherein the electric motor adopts a planetary gear.

[0011] Furthermore, it is defined that the mid-mounted motor also includes a shell, the two ends of the central shaft pass through the shell, the right end of the sleeve shaft passes through the right side of the shell, the output sprocket is installed on the right outer side of the shell, and the auxiliary shaft, power input unit and transmission reduction gear are all accommodated inside the shell. With such a shell structure, the transmission is safe and stable, and the rider's pants can be prevented from being caught in the transmission gear, and the appearance is beautiful.

[0012] The second object of the present invention is to provide a multi-gear mid-mounted motor shifting method, which has stable shifting and simple operation. The first gear is directly the starting gear. The second gear, the third gear, and the fourth gear are all by moving the first sliding double ratchet, the third sliding double ratchet, and the second sliding double ratchet to the left. The fifth gear, the sixth gear, and the seventh gear are all by moving the first sliding double ratchet, the third sliding double ratchet, and the second sliding double ratchet to the right. This design is conducive to simplifying the design of the speed change drum.

[0013] The specific shifting method is: when in the starting first gear position,

[0014] When the pedal is used as the power, the pedal transmits the driving power to the middle shaft. The second-gear middle shaft gear transmits the driving power to the first-gear auxiliary shaft gear under the unidirectional positive action of the first one-way clutch, and then transmits it to the first-gear middle shaft gear. Under the unidirectional positive action of the third one-way clutch, the driving power is transmitted to the sleeve shaft and the output sprocket; at this time, the transition gear is under the unidirectional reverse action of the second one-way clutch, and the transition gear and the transmission reduction gear do not transmit torque, and will not cause the motor to reverse; at this time, the first sliding double ratchet ratchet, the second sliding double ratchet ratchet and the third sliding double ratchet ratchet are all in an idle state;

[0015] When the electric motor is used as the power, the electric motor transmits the driving power to the transmission reduction gear and the transition gear. Under the unidirectional positive action of the second one-way clutch, the driving power is transmitted to the auxiliary shaft, and then to the first gear auxiliary shaft gear and the first gear middle shaft gear. Under the unidirectional positive action of the third one-way clutch, the driving power is transmitted to the sleeve shaft, and then to the output sprocket. At this time, under the unidirectional reverse action of the first one-way clutch, the second gear middle shaft gear and the middle shaft do not transmit torque, and the first sliding double ratchet, the second sliding double ratchet and the third sliding double ratchet are all in an unconnected state.

[0016] When changing from first gear to second gear,

[0017] When the pedal is used as the power source, the pedal transmits the driving power to the said middle shaft, slides the first sliding double ratchet wheel to the left so that the left ratchet engages with the inner ratchet of the second gear middle shaft gear, and transmits the driving power to the said sleeve shaft and the output sprocket; at this time, the second sliding double ratchet wheel and the third sliding double ratchet wheel are in an unconnected state;

[0018] When the electric motor is used as the power, the electric motor transmits the driving power to the transmission reduction gear and the transition gear. Under the unidirectional positive action of the second one-way clutch, the driving power is transmitted to the auxiliary shaft (and the second gear auxiliary shaft gear), and then to the second gear middle shaft gear. The first sliding double ratchet ratchet is slid to the left so that the left ratchet engages with the inner ratchet of the second gear middle shaft gear, and the driving power is transmitted to the sleeve shaft and the output sprocket; at this time, due to the unidirectional reverse action of the first one-way clutch, the second gear middle shaft gear will not transmit the driving power to the active shaft; due to the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the auxiliary shaft and the first gear auxiliary shaft gear; at this time, the second sliding double ratchet ratchet and the third sliding double ratchet ratchet are in an idle state;

[0019] When changing from second gear to third gear,

[0020] When the pedal is used as the power, the pedal transmits the driving power to the middle shaft. Under the unidirectional positive action of the first one-way clutch, the second-gear middle shaft gear transmits the driving power to the second-gear auxiliary shaft gear and the auxiliary shaft. The third sliding double-ratchet ratchet is slid to the left so that the left ratchet engages with the inner ratchet of the third-gear auxiliary shaft gear, transmitting the driving power to the third-gear middle shaft gear, and then transmitting the driving power to the sleeve shaft and the output sprocket. At this time, the first sliding double-ratchet ratchet and the second sliding double-ratchet ratchet are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear.

[0021] When the electric motor is used as the power, the electric motor transmits the driving power to the transmission reduction gear and the transition gear. Under the unidirectional positive action of the second one-way clutch, the driving power is transmitted to the auxiliary shaft, and the third sliding double ratchet ratchet is slid to the left so that the left ratchet engages with the inner ratchet of the third-gear auxiliary shaft gear, transmitting the driving power to the third-gear middle shaft gear, and then transmitting the driving power to the sleeve shaft and the output sprocket; at this time, the first sliding double ratchet ratchet and the second sliding double ratchet ratchet are in an unconnected state; under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear;

[0022] When changing from third gear to fourth gear,

[0023] When the pedal is used as the power, the pedal transmits the driving power to the middle shaft. Under the unidirectional positive action of the first one-way clutch, the second-gear middle shaft gear transmits the driving power to the second-gear auxiliary shaft gear and the auxiliary shaft. The second sliding double-ratchet ratchet is slid to the left so that the left ratchet engages with the inner ratchet of the fourth-gear auxiliary shaft gear, and the driving power is transmitted to the fourth-gear middle shaft gear, thereby transmitting the driving power to the sleeve shaft and the output sprocket. At this time, the first sliding double-ratchet ratchet and the third sliding double-ratchet ratchet are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear.

[0024] When the electric motor is used as the power, the electric motor transmits the driving power to the transmission reduction gear and the transition gear. Under the unidirectional positive action of the second one-way clutch, the driving power is transmitted to the auxiliary shaft, and the second sliding double-ratchet ratchet is slid to the left so that the left ratchet engages with the inner ratchet of the fourth-gear auxiliary shaft gear, and the driving power is transmitted to the fourth-gear middle shaft gear, and the driving power is transmitted to the sleeve shaft and the output sprocket; at this time, the first sliding double-ratchet ratchet and the third sliding double-ratchet ratchet are in an unconnected state; under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear;

[0025] When changing from fourth gear to fifth gear,

[0026] When the pedal is used as the power, the pedal transmits the driving power to the middle shaft. Under the unidirectional positive action of the first one-way clutch, the second-gear middle shaft gear transmits the driving power to the second-gear auxiliary shaft gear and the auxiliary shaft. The first sliding double-ratchet ratchet is slid to the right so that the right ratchet engages with the inner ratchet of the fifth-gear middle shaft gear, and the driving power is transmitted to the fifth-gear middle shaft gear, thereby transmitting the driving power to the sleeve shaft and the output sprocket. At this time, the second sliding double-ratchet ratchet and the third sliding double-ratchet ratchet are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear.

[0027] When the electric motor is used as the power, the electric motor transmits the driving power to the transmission reduction gear and the transition gear. Under the unidirectional positive action of the second one-way clutch, the driving power is transmitted to the auxiliary shaft, and the first sliding double-ratchet ratchet is slid to the right so that the right ratchet engages with the inner ratchet of the fifth-speed middle shaft gear, and the driving power is transmitted to the fifth-speed middle shaft gear and then to the sleeve shaft and the output sprocket; at this time, the second sliding double-ratchet ratchet and the third sliding double-ratchet ratchet are in an unconnected state; under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-speed middle shaft gear;

[0028] When changing from fifth gear to sixth gear,

[0029] When the pedal is used as the power, the pedal transmits the driving power to the middle shaft. Under the unidirectional positive action of the first one-way clutch, the second-gear middle shaft gear transmits the driving power to the second-gear auxiliary shaft gear and the auxiliary shaft. The third sliding double-ratchet ratchet is slid to the right so that the right ratchet engages with the inner ratchet of the sixth-gear auxiliary shaft gear, and the driving power is transmitted to the sixth-gear middle shaft gear, thereby transmitting the driving power to the sleeve shaft and the output sprocket. At this time, the first sliding double-ratchet ratchet and the second sliding double-ratchet ratchet are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear.

[0030] When the electric motor is used as the power, the electric motor transmits the driving power to the transmission reduction gear and the transition gear. Under the unidirectional positive action of the second one-way clutch, the driving power is transmitted to the auxiliary shaft, and the third sliding double ratchet ratchet is slid to the right so that the right ratchet engages with the internal ratchet of the sixth-gear auxiliary shaft gear, and the driving power is transmitted to the sixth-gear middle shaft gear, and the driving power is transmitted to the sleeve shaft and the output sprocket; at this time, the first sliding double ratchet ratchet and the second sliding double ratchet ratchet are in an unconnected state; under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear;

[0031] When changing from sixth gear to seventh gear,

[0032] When the pedal is used as the power, the pedal transmits the driving power to the middle shaft. Under the unidirectional positive action of the first one-way clutch, the second-gear middle shaft gear transmits the driving power to the second-gear auxiliary shaft gear and the auxiliary shaft. The second sliding double-ratchet ratchet is slid to the right so that the right ratchet engages with the inner ratchet of the seventh-gear auxiliary shaft gear, and the driving power is transmitted to the seventh-gear middle shaft gear, thereby transmitting the driving power to the sleeve shaft and the output sprocket. At this time, the first sliding double-ratchet ratchet and the third sliding double-ratchet ratchet are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch, the sleeve shaft will not transmit the driving power to the first-gear middle shaft gear.

[0033] When shifting back, the order is reversed.

[0034] The above-mentioned gear shifting method is combined with the speed shifting structure to make the gear shifting more stable.

[0035] The ratchets are all helical teeth. When the working surface of the ratchet is stressed, the direction of the force is toward the root of the ratchet, so that the gear ratchet and the sleeve ratchet are automatically clamped, thereby transmitting torque. The technical effect of the above-mentioned method of connection between the wheel and the ratchet is: (1) Due to the structure of the internal ratchet gear and the one-way clutch being in a constant contact state, when power transmission is required, they are driven in an engaged state, and when power transmission is not required, they are slipped in a separated state. (2) When clamping is required, the ratchet teeth and the gear ratchet are easy to engage and can prevent falling off; (3) When there is a speed difference, the ratchet teeth and the gear ratchet are easy to disengage. The specific reason is: due to the angle of the ratchet, when the working surface of the ratchet is stressed, the direction of the force is toward the root of the ratchet, so that the ratchet teeth and the gear ratchet are automatically clamped, thereby transmitting torque. Since the tooth back angle of the ratchet is flat, it cannot transmit torque. When the tooth back of the ratchet is stressed, the direction of the force is away from the tooth root, so that the ratchet teeth and the gear ratchet are away from each other, thereby automatically separating.

[0036] The one-way clutch is more stable during one-way forward transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic diagram of the three-dimensional structure of the present invention;

[0038] FIG2 is a schematic perspective view of the structure of the first one-way clutch after the second gear intermediate shaft gear in FIG1 is removed;

[0039] FIG3 is a schematic diagram of the structure of the present invention in the first gear;

[0040] FIG4 is a schematic diagram of the structure of the present invention in second gear;

[0041] FIG5 is a schematic diagram of the structure of the present invention in third gear;

[0042] FIG6 is a schematic diagram of the structure of the present invention in fourth gear;

[0043] FIG7 is a schematic diagram of the structure of the present invention in fifth gear;

[0044] FIG8 is a schematic diagram of the structure of the present invention in sixth gear;

[0045] FIG9 is a schematic diagram of the structure of the present invention in seventh gear;

[0046] FIG10 is a schematic diagram of the positions of the first one-way clutch, the second one-way clutch, and the third one-way clutch in the structure of the present invention (after removing the corresponding gears above).

[0047] In the figure logo,

[0048] Middle shaft 1, first one-way clutch 10, second gear middle shaft gear 12;

[0049] Auxiliary shaft 2, second gear auxiliary shaft gear 22, transition gear 4, second one-way clutch 20, fifth gear auxiliary shaft gear 25, fourth gear auxiliary shaft gear 24, second sliding double ratchet 52, seventh gear auxiliary shaft gear 27, first gear auxiliary shaft gear 21, third gear auxiliary shaft gear 23, third sliding double ratchet 53 and sixth gear auxiliary shaft gear 26;

[0050] The sleeve shaft 3, the first sliding double ratchet gear 51, the fifth gear intermediate shaft gear 35, the fourth gear intermediate shaft gear 34, the seventh gear intermediate shaft gear 37, the first gear intermediate shaft gear 31, the third one-way clutch 30, the third gear intermediate shaft gear 33, the sixth gear intermediate shaft gear 36 and the output sprocket 39;

[0051] Pedal power input unit - pedal 5;

[0052] Power-assist input unit: motor 6, motor output shaft 61, motor output gear 62;

[0053] Transmission reduction gear 7. DETAILED DESCRIPTION

[0054] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0055] Embodiment, the gear position of this embodiment is seven gear positions, as shown in Figures 1 to 10, a multi-gear mid-mounted motor includes a middle shaft 1, a sleeve shaft 3, an auxiliary shaft 2, a pedal 5, a motor 62, a transmission reduction gear 7, a second one-way clutch 20, and a first one-way clutch 10, wherein,

[0056] The left section of the middle shaft 1 is provided with a second-gear middle shaft gear 12, and the second-gear middle shaft gear 12 and the middle shaft 1 are connected via a first one-way clutch 10;

[0057] The sleeve shaft 3 is sleeved on the right section of the middle shaft 1 on the right side of the second gear middle shaft gear 12; when the first sliding double ratchet gear slides to the left, it meshes with the ratchet teeth of the second gear middle shaft gear, transmitting the power from the middle shaft to the sleeve shaft; the sleeve shaft is equipped with a first sliding double ratchet gear 51, a fifth gear middle shaft gear 35, a fourth gear middle shaft gear 34, a seventh gear middle shaft gear 37, a first gear middle shaft gear 31, a third gear middle shaft gear 33, a sixth gear middle shaft gear 36 and an output sprocket 39 in sequence from left to right; wherein, the output sprocket 39 is fixedly connected to the sleeve shaft 3, and the first gear middle shaft gear 31 and the sleeve shaft 3 are connected via a third one-way clutch 30; the fifth gear middle shaft gear 35, the fourth gear middle shaft gear 34, the seventh gear middle shaft gear 37, the third gear middle shaft gear 33 and the sixth gear middle shaft gear 36 are fixedly sleeved on the sleeve shaft 3; the first sliding double ratchet gear 51 is slidably sleeved on the sleeve shaft 3;

[0058] The auxiliary shaft 2 is equipped with the second gear auxiliary shaft gear 22, the transition gear 4, the fifth gear auxiliary shaft gear 25, the fourth gear auxiliary shaft gear 24, the second sliding double ratchet 52, the seventh gear auxiliary shaft gear 27, the first gear auxiliary shaft gear 21, the third gear auxiliary shaft gear 23, the third sliding double ratchet 53 and the sixth gear auxiliary shaft gear 26 in sequence from left to right; wherein, the first gear auxiliary shaft gear 21 and the second gear auxiliary shaft gear 22 are fixedly connected to the auxiliary shaft 2, and the transition gear 4 and the secondary central shaft 2 are connected via a second one-way clutch 20; the second sliding double ratchet 52 and the third sliding double ratchet 53 are both slidably sleeved on the auxiliary shaft 2, and the fifth gear auxiliary shaft gear 25, the fourth gear auxiliary shaft gear 24, the seventh gear auxiliary shaft gear 27, the third gear auxiliary shaft gear 23 and the sixth gear auxiliary shaft gear 26 are loosely sleeved on the auxiliary shaft 2;

[0059] The pedals 5 are fixedly connected to the left and right ends of the central shaft 1 to transmit driving power to the central shaft 1 .

[0060] The motor 6 transmits the driving power to the transition gear 4 through the transmission reduction gear 7;

[0061] The motor 6 includes a motor output shaft 61 and a motor output gear 62 . The motor output gear 62 is fixed on the motor output shaft 61 . The motor output gear 62 transmits power to the transmission reduction gear 7 to the transition gear 4 .

[0062] It also includes a shell, with both ends of the central shaft 1 passing through the shell, the right end of the sleeve shaft 3 passing through the right side of the shell, the output sprocket 39 being installed on the right outer side of the shell, and the auxiliary shaft 2, the power input unit and the transmission reduction gear 7 being all accommodated inside the shell.

[0063] The transition gear 4 corresponds to the position of the first sliding double ratchet wheel 51 .

[0064] A multi-speed mid-mounted motor shifting method using this technical solution,

[0065] When in the first gear position,

[0066] When the pedal 5 is used as the power, the pedal transmits the driving power to the central shaft 1. The second-gear central shaft gear 12 transmits the driving power to the first-gear auxiliary shaft gear 21 under the unidirectional positive action of the first one-way clutch 10, and then transmits it to the first-gear central shaft gear 31. Under the unidirectional positive action of the third one-way clutch 30, the driving power is transmitted to the sleeve shaft 3 and the output sprocket 39. At this time, the transition gear 4 and the transmission reduction gear 7 do not transmit torque under the unidirectional reverse action of the second one-way clutch 20, and will not cause the motor to reverse. At this time, the first sliding double ratchet 51, the second sliding double ratchet 52 and the third sliding double ratchet 53 are all in an unconnected state.

[0067] When the motor 6 is used as the power source, the motor 6 transmits the driving power to the transmission reduction gear 7 and the transition gear 4. Under the unidirectional positive action of the second one-way clutch 20, the driving power is transmitted to the auxiliary shaft 2, and then to the first gear auxiliary shaft gear 21 and the first gear middle shaft gear 31. Under the unidirectional positive action of the third one-way clutch 30, the driving power is transmitted to the sleeve shaft 3, and then to the output sprocket 39. At this time, under the unidirectional reverse action of the first one-way clutch 10, the second gear middle shaft gear 12 and the middle shaft 1 do not transmit torque, and the first sliding double ratchet 51, the second sliding double ratchet 52 and the third sliding double ratchet 53 are all in an unconnected state.

[0068] When changing from first gear to second gear,

[0069] When the pedal 5 is used as the power source, the pedal transmits the driving power to the central shaft 1, sliding the first sliding double-ratchet ratchet 51 to the left so that the left ratchet engages with the inner ratchet of the second-gear central shaft gear 12, transmitting the driving power to the sleeve shaft 3 and the output sprocket 39; at this time, the second sliding double-ratchet ratchet 52 and the third sliding double-ratchet ratchet 53 are in an unconnected state;

[0070] When the motor 6 is used as the power, the motor 6 transmits the driving power to the transmission reduction gear 7 and the transition gear 4. Under the unidirectional positive action of the second one-way clutch 20, the driving power is transmitted to the auxiliary shaft 2 and the second gear auxiliary shaft gear 22, and then to the second gear middle shaft gear 12. The first sliding double ratchet ratchet 51 is slid to the left so that the left ratchet engages with the inner ratchet of the second gear middle shaft gear 12, and the driving power is transmitted to the sleeve shaft 3 and the output sprocket 39. At this time, due to the unidirectional reverse action of the first one-way clutch 10, the second gear middle shaft gear 12 will not transmit the driving power to the active shaft 1. Due to the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 will not transmit the driving power to the auxiliary shaft and the first gear auxiliary shaft gear 21. At this time, the second sliding double ratchet ratchet 52 and the third sliding double ratchet ratchet 53 are in an unconnected state.

[0071] When changing from second gear to third gear,

[0072] When the pedal 5 is used as the power source, the pedal transmits the driving power to the central shaft 1. Under the unidirectional positive action of the first one-way clutch 10, the second-gear central shaft gear 12 transmits the driving power to the second-gear auxiliary shaft gear 21 and the auxiliary shaft. The third sliding double-ratchet ratchet 53 slides to the left so that the left ratchet engages with the inner ratchet of the third-gear auxiliary shaft gear 23, transmitting the driving power to the third-gear central shaft gear 33, and then transmitting the driving power to the sleeve shaft 3 and the output sprocket 39. At this time, the first sliding double-ratchet ratchet 51 and the second sliding double-ratchet ratchet 52 are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear central shaft gear 31.

[0073] When the motor 6 is used as the power source, the motor 6 transmits the driving power to the transmission reduction gear 7 and the transition gear 4. Under the unidirectional positive action of the second one-way clutch 20, the driving power is transmitted to the auxiliary shaft 2, and the third sliding double ratchet 53 is slid to the left so that the left ratchet engages with the inner ratchet of the third-gear auxiliary shaft gear 23, transmitting the driving power to the third-gear middle shaft gear 33, and then transmitting the driving power to the sleeve shaft 3 and the output sprocket 39. At this time, the first sliding double ratchet 51 and the second sliding double ratchet 52 are in an unconnected state. Under the unidirectional negative action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear middle shaft gear 31.

[0074] When changing from third gear to fourth gear,

[0075] When the pedal 5 is used as the power source, the pedal transmits the driving power to the central shaft 1. Under the unidirectional positive action of the first one-way clutch 10, the second-gear central shaft gear 12 transmits the driving power to the second-gear auxiliary shaft gear 21 and the auxiliary shaft. The second sliding double-ratchet ratchet 52 slides to the left so that the left ratchet engages with the inner ratchet of the fourth-gear auxiliary shaft gear 24, transmitting the driving power to the fourth-gear central shaft gear 34 and the driving power to the sleeve shaft 3 and the output sprocket 39. At this time, the first sliding double-ratchet ratchet 51 and the third sliding double-ratchet ratchet 53 are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear central shaft gear 31.

[0076] When the motor 6 is used as the power source, the motor 6 transmits the driving power to the transmission reduction gear 7 and the transition gear 4. Under the unidirectional positive action of the second one-way clutch 20, the driving power is transmitted to the auxiliary shaft 2, and the second sliding double ratchet 52 is slid to the left so that the left ratchet engages with the inner ratchet of the fourth-gear auxiliary shaft gear 24, transmitting the driving power to the fourth-gear middle shaft gear 34 and then to the sleeve shaft 3 and the output sprocket 39. At this time, the first sliding double ratchet 51 and the third sliding double ratchet 53 are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear middle shaft gear 31.

[0077] When changing from fourth gear to fifth gear,

[0078] When the pedal 5 is used as the power, the pedal transmits the driving power to the middle shaft 1. Under the unidirectional positive action of the first one-way clutch 10, the second-gear middle shaft gear 12 transmits the driving power to the second-gear auxiliary shaft gear 21 and the auxiliary shaft. The first sliding double-ratchet ratchet 51 slides to the right so that the right ratchet engages with the inner ratchet of the fifth-gear middle shaft gear 35, transmitting the driving power to the fifth-gear middle shaft gear 35 and then to the sleeve shaft 3 and the output sprocket 39. At this time, the second sliding double-ratchet ratchet 52 and the third sliding double-ratchet ratchet 53 are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear middle shaft gear 31.

[0079] When the motor 6 is used as the power, the motor 6 transmits the driving power to the transmission reduction gear 7 and the transition gear 4. Under the unidirectional positive action of the second one-way clutch 20, the driving power is transmitted to the auxiliary shaft 2, and the first sliding double ratchet 51 is slid to the right so that the right ratchet engages with the inner ratchet of the fifth-speed middle shaft gear 35, transmitting the driving power to the fifth-speed middle shaft gear 35 and then to the sleeve shaft 3 and the output sprocket 39. At this time, the second sliding double ratchet 52 and the third sliding double ratchet 53 are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-speed middle shaft gear 31.

[0080] When changing from fifth gear to sixth gear,

[0081] When the pedal 5 is used as the power source, the pedal transmits the driving power to the central shaft 1. Under the unidirectional positive action of the first one-way clutch 10, the second-gear central shaft gear 12 transmits the driving power to the second-gear auxiliary shaft gear 21 and the auxiliary shaft. The third sliding double-ratchet ratchet 53 slides to the right so that the right ratchet engages with the inner ratchet of the sixth-gear auxiliary shaft gear 26, transmitting the driving power to the sixth-gear central shaft gear 36 and the driving power to the sleeve shaft 3 and the output sprocket 39. At this time, the first sliding double-ratchet ratchet 51 and the second sliding double-ratchet ratchet 52 are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear central shaft gear 31.

[0082] When the motor 6 is used as the power source, the motor 6 transmits the driving power to the transmission reduction gear 7 and the transition gear 4. Under the unidirectional positive action of the second one-way clutch 20, the driving power is transmitted to the auxiliary shaft 2, and the third sliding double ratchet 53 is slid to the right so that the right ratchet engages with the internal ratchet of the sixth-gear auxiliary shaft gear 26, transmitting the driving power to the sixth-gear middle shaft gear 36, and then transmitting the driving power to the sleeve shaft 3 and the output sprocket 39; at this time, the first sliding double ratchet 51 and the second sliding double ratchet 52 are in an unconnected state; under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear middle shaft gear 31;

[0083] When changing from sixth gear to seventh gear,

[0084] When the pedal 5 is used as the power source, the pedal transmits the driving power to the central shaft 1. Under the unidirectional positive action of the first one-way clutch 10, the second-gear central shaft gear 12 transmits the driving power to the second-gear auxiliary shaft gear 21 and the auxiliary shaft. The second sliding double-ratchet ratchet 52 slides rightward so that the right ratchet engages with the inner ratchet of the seventh-gear auxiliary shaft gear 27, transmitting the driving power to the seventh-gear central shaft gear 37 and the driving power to the sleeve shaft 3 and the output sprocket 39. At this time, the first sliding double-ratchet ratchet 51 and the third sliding double-ratchet ratchet 53 are in an unconnected state. Under the unidirectional reverse action of the third one-way clutch 30, the sleeve shaft 3 does not transmit the driving power to the first-gear central shaft gear 31.

[0085] When shifting back, the order is reversed.

[0086] The description of the above specific embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the invention. For example, simply changing the inclination angle of the tooth surface, the number of teeth on the gear ratchet and the number of teeth on the sleeve ratchet, these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-gear mid-mounted motor, comprising a mid-shaft (1), an auxiliary shaft (2), a pedal power input unit, a power-assist input unit and a transmission reduction gear (7), wherein the pedal power input unit is fixedly connected to the left and right ends of the mid-shaft (1) to transmit the driving power to the mid-shaft (1); the power-assist input unit transmits the driving power to the transition gear (4) through the transmission reduction gear (7), characterized in that: It also includes a sleeve shaft (3), a first one-way clutch (10) and a second one-way clutch (20). The left section of the middle shaft (1) is provided with a second-gear middle shaft gear (12), and the second-gear middle shaft gear (12) and the middle shaft (1) are connected via the first one-way clutch (10); The sleeve shaft (3) is sleeved on the right section of the middle shaft (1) on the right side of the second gear middle shaft gear (12); the sleeve shaft is equipped with at least a first sliding double ratchet (51), a first gear middle shaft gear (31) and an output sprocket (39) from left to right, wherein the output sprocket (39) is fixedly connected to the sleeve shaft (3), the first gear middle shaft gear (31) and the sleeve shaft (3) are connected via a third one-way clutch (30), and the first sliding double ratchet (51) is slidably sleeved on the sleeve shaft (3); The auxiliary shaft (2) is equipped with at least a second-gear auxiliary shaft gear (22), a transition gear (4), and a first-gear auxiliary shaft gear (21) from left to right, wherein the first-gear auxiliary shaft gear (21) and the second-gear auxiliary shaft gear (22) are fixedly connected to the auxiliary shaft (2), and the transition gear (4) and the secondary middle shaft (2) are connected via the second one-way clutch (20); When the first sliding double ratchet wheel (51) slides to the left, it meshes with the ratchet teeth of the second gear middle shaft gear (12), transmitting the power from the middle shaft (1) to the sleeve shaft (3).

2. A multi-gear mid-mounted motor as claimed in claim 1, characterized in that: The multi-speed shifting mid-mounted motor is a seven-speed mid-mounted motor. The sleeve shaft is equipped with a first sliding double ratchet wheel (51), a fifth gear middle shaft gear (35), a fourth gear middle shaft gear (34), a seventh gear middle shaft gear (37), a first gear middle shaft gear (31), a third gear middle shaft gear (33), a sixth gear middle shaft gear (36) and an output sprocket (39) in sequence from left to right; wherein the output sprocket (39) is fixedly connected to the sleeve shaft (3), and the first gear middle shaft gear (31) and the sleeve shaft (3) are connected via a third one-way clutch (30); the fifth gear middle shaft gear (35), the fourth gear middle shaft gear (34), the seventh gear middle shaft gear (37), the third gear middle shaft gear (33) and the sixth gear middle shaft gear (36) are fixedly sleeved on the sleeve shaft (3); and the first sliding double ratchet wheel (51) is slidably sleeved on the sleeve shaft (3); The auxiliary shaft (2) is equipped with a second gear auxiliary shaft gear (22), a transition gear (4), a fifth gear auxiliary shaft gear (25), a fourth gear auxiliary shaft gear (24), a second sliding double ratchet ratchet wheel (52), a seventh gear auxiliary shaft gear (27), a first gear auxiliary shaft gear (21), a third gear auxiliary shaft gear (23), a third sliding double ratchet ratchet wheel (53) and a sixth gear auxiliary shaft gear (26) in sequence from left to right; wherein the first gear auxiliary shaft gear (21) and the second gear auxiliary shaft gear (22) are fixedly connected to the auxiliary shaft (2), and the transition gear (4) is The ferry gear (4) and the auxiliary central shaft (2) are connected via a second one-way clutch (20); the second sliding double ratchet gear (52) and the third sliding double ratchet gear (53) are both slidably sleeved on the auxiliary shaft (2); and the fifth gear auxiliary shaft gear (25), the fourth gear auxiliary shaft gear (24), the seventh gear auxiliary shaft gear (27), the third gear auxiliary shaft gear (23) and the sixth gear auxiliary shaft gear (26) are loosely sleeved on the auxiliary shaft (2).

3. A multi-gear mid-mounted motor as claimed in claim 2, characterized in that: The pedal power input unit is a pedal (5), the power input unit is a motor (6), the motor (6) comprises a motor output shaft (61) and a motor output gear (62), the motor output gear (62) is fixed on the motor output shaft (61), and the motor output gear (62) transmits power to the transmission reduction gear (7) to the transition gear (4).

4. A multi-gear mid-mounted motor as claimed in claim 1, characterized in that: It also includes a shell, the two ends of the central shaft (1) pass through the shell, the right end of the sleeve shaft (3) passes through the right side of the shell, the output sprocket (39) is installed on the right outer side of the shell, and the auxiliary shaft (2), the power input unit and the transmission reduction gear (7) are all accommodated inside the shell.

5. A multi-gear mid-mounted motor as claimed in claim 3, characterized in that: The transition gear 4 corresponds to the position of the first sliding double ratchet wheel (51).

6. A shifting method for a mid-mounted motor with multiple gears as claimed in claim 5, characterized in that: When in the first gear position, When the pedal (5) is used as the power, the pedal (5) transmits the driving power to the middle shaft (1), the first gear auxiliary shaft gear (21), the first gear middle shaft gear (31), the sleeve shaft (3) and the output sprocket (39) in sequence; at this time, under the unidirectional reverse action of the second one-way clutch (20), the transition gear (4) and the transmission reduction gear (7) do not transmit torque, and will not cause the motor to reverse; at this time, the first sliding double ratchet ratchet wheel (51), the second sliding double ratchet ratchet wheel 52 and the third sliding double ratchet ratchet wheel (53) are all in an unconnected state; When the electric motor (6) is used as the power, the electric motor (6) sequentially transmits the driving power to the transmission reduction gear (7), the transition gear (4), the auxiliary shaft (2), the first gear auxiliary shaft gear (21), the first gear middle shaft gear (31), the sleeve shaft (3), and the output sprocket (39); the first sliding double ratchet wheel (51), the second sliding double ratchet wheel 52, and the third sliding double ratchet wheel (53) are all in an unconnected state; When in the second gear position, When the pedal (5) is used as the power, the pedal (5) sequentially transmits the driving power to the middle shaft (1), and then to the sleeve shaft (3) and the output sprocket (39); at this time, the first sliding double ratchet wheel (51) slides to the left so that the left ratchet engages with the inner ratchet of the second gear middle shaft gear (12), and the second sliding double ratchet wheel 52 and the third sliding double ratchet wheel (53) are in an unconnected state; When the electric motor (6) is used as the power, the electric motor (6) transmits the driving power in sequence to the transmission reduction gear (7), the transition gear (4), the auxiliary shaft (2), the second gear auxiliary shaft gear (22), the second gear middle shaft gear (12), the sleeve shaft (3), the output sprocket (39); at this time, the first sliding double ratchet wheel (51) slides to the left so that the left ratchet engages with the inner ratchet of the second gear middle shaft gear (12), and the second sliding double ratchet wheel 52 and the third sliding double ratchet wheel (53) are in an empty connection state; When in the third gear position, When the pedal (5) is used as the power, the pedal (5) transmits the driving power to the middle shaft (1), the second gear middle shaft gear, the second gear auxiliary shaft gear (21), the auxiliary shaft (2), the third gear middle shaft gear (33), the sleeve shaft (3), and the output sprocket (39) in sequence; at this time, the third sliding double ratchet ratchet wheel (53) slides to the left so that the left ratchet engages with the inner ratchet of the third gear auxiliary shaft gear (23), and the first sliding double ratchet ratchet wheel (51) and the second sliding double ratchet ratchet wheel 52 are in an unconnected state; When the motor (6) is used as the power, the motor (6) transmits the driving power to the reduction gear (7), the transition gear (4), the auxiliary shaft (2), the third gear middle shaft gear (33), the sleeve shaft (3), and the output sprocket (39) in sequence; at this time, the third sliding double ratchet ratchet wheel (53) slides to the left so that the left ratchet teeth are meshed with the inner ratchet teeth of the third gear auxiliary shaft gear (23), and the first sliding double ratchet ratchet wheel (51) and the second sliding double ratchet ratchet wheel 52 are in an unconnected state; When in the fourth gear position, When the pedal (5) is used as the power, the pedal (5) transmits the driving power to the middle shaft (1), the second gear auxiliary shaft gear (21), the auxiliary shaft, the fourth gear middle shaft gear (34), the sleeve shaft (3), and the output sprocket (39) in sequence; at this time, the second sliding double ratchet ratchet wheel 52 slides to the left so that the left ratchet teeth are meshed with the inner ratchet teeth of the fourth gear auxiliary shaft gear (24), and the first sliding double ratchet ratchet wheel (51) and the third sliding double ratchet ratchet wheel (53) are in an unconnected state; When the motor (6) is used as the power, the motor (6) sequentially transmits the driving power to the transmission reduction gear (7), the transition gear (4), the auxiliary shaft (2), the fourth-gear auxiliary shaft gear (24), the fourth-gear middle shaft gear (34), the sleeve shaft (3), and the output sprocket (39); at this time, the second sliding double ratchet ratchet wheel (52) slides to the left so that the left ratchet teeth are meshed with the inner ratchet teeth of the fourth-gear auxiliary shaft gear (24), and the first sliding double ratchet ratchet wheel (51) and the third sliding double ratchet ratchet wheel (53) are in an unconnected state; When in fifth gear, When the pedal (5) is used as the power, the pedal (5) transmits the driving power to the middle shaft (1), the second gear auxiliary shaft gear (21), the auxiliary shaft (2), the fifth gear middle shaft gear (35), the sleeve shaft (3), and the output sprocket (39) in sequence; at this time, the first sliding double ratchet ratchet wheel (51) slides rightward so that the right ratchet is meshed with the inner ratchet of the fifth gear middle shaft gear (35), and the second sliding double ratchet ratchet wheel 52 and the third sliding double ratchet ratchet wheel (53) are in an unconnected state; When the motor (6) is used as the power, the motor (6) sequentially transmits the driving power to the transmission reduction gear (7), the transition gear (4), the auxiliary shaft (2), the fifth-speed middle shaft gear (35), the sleeve shaft (3) and the output sprocket (39); at this time, the second sliding double ratchet wheel (52) and the third sliding double ratchet wheel (53) are in an empty connection state; at this time, the first sliding double ratchet wheel (51) slides rightward so that the right ratchet engages with the inner ratchet of the fifth-speed middle shaft gear (35), and the second sliding double ratchet wheel 52 and the third sliding double ratchet wheel (53) are in an empty connection state; When in the sixth gear position, When the pedal (5) is used as the power, the pedal (5) transmits the driving power to the middle shaft (1), the second gear auxiliary shaft gear (21), the auxiliary shaft, the sixth gear middle shaft gear (36), the sleeve shaft (3), and the output sprocket (39) in sequence; at this time, the third sliding double ratchet ratchet wheel (53) slides rightward so that the right ratchet engages with the inner ratchet of the sixth gear auxiliary shaft gear (26), and the first sliding double ratchet ratchet wheel (51) and the second sliding double ratchet ratchet wheel (52) are in an unconnected state; When the motor (6) is used as the power, the motor (6) transmits the driving power to the transmission reduction gear (7), the transition gear (4), the auxiliary shaft (2), the sixth gear middle shaft gear (36), the sleeve shaft (3) and the output sprocket (39) in sequence; at this time, the third sliding double ratchet ratchet wheel (53) slides rightward so that the right ratchet teeth are meshed with the inner ratchet teeth of the sixth gear auxiliary shaft gear (26), and the first sliding double ratchet ratchet wheel (51) and the second sliding double ratchet ratchet wheel 52 are in an unconnected state; When in the seventh gear position, When the pedal (5) is used as the power, the pedal (5) transmits the driving power to the middle shaft (1), the second gear auxiliary shaft gear (21), the auxiliary shaft (2), the seventh gear middle shaft gear (37), the sleeve shaft (3), and the output sprocket (39) in sequence; at this time, the second sliding double ratchet ratchet wheel 52 slides rightward so that the right ratchet teeth are meshed with the inner ratchet teeth of the seventh gear auxiliary shaft gear (27), and the first sliding double ratchet ratchet wheel (51) and the third sliding double ratchet ratchet wheel (53) are in an unconnected state.

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