CN211281364U

CN211281364U - Power transmission system of electric power-assisted bicycle

Info

Publication number: CN211281364U
Application number: CN201921624546.9U
Authority: CN
Inventors: 胡帅; 吴俊�; 周奇
Original assignee: Wuxi Truckrun Intelligent Motor Co ltd
Current assignee: Wuxi Truckrun Intelligent Motor Co ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-08-18
Anticipated expiration: 2029-09-27

Abstract

The utility model discloses a power transmission system of an electric power-assisted bicycle, which comprises a motor core; the first transmission shaft, the second transmission shaft, the output gear and the five-way shaft are rotatably arranged in the case through bearings; a section of primary driving gear shaft is arranged on a core shaft of the motor core; a primary damping plastic driven gear is synchronously installed on the first transmission shaft, and a primary driving gear shaft is meshed with the primary damping plastic driven gear; a section of secondary driving gear shaft is arranged on the first transmission shaft; the structure of adopting one-way bearing makes core and five-way axle throw off each other when using manual drive completely, and then need not drive the movement of core axle, plays the laborsaving effect of pure man-hour.

Description

Power transmission system of electric power-assisted bicycle

Technical Field

The utility model belongs to and moped transmission system field.

Background

One part of the driving force of the power-assisted electric vehicle comes from manual pedals, one part of the driving force comes from a motor, and when the power-assisted electric vehicle is completely driven by a human, a five-way shaft of the existing power-assisted bicycle can also synchronously drag a machine core to rotate, so that the manual labor is caused.

The motor condition of moped is complicated, and the motor needs frequent switching output moment of torsion and power, because the meshing between the last one-level driving gear axle of motor output shaft and the one-level moving gear is connected and is had certain assembly clearance, when the motor switches output at every turn, the gear shaft on the motor shaft can produce great noise with drive gear's meshing transmission, but also can transmit great vibrations and give the motor core, influence its performance.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the utility model provides a power transmission system of an electric power-assisted bicycle with low noise and more labor saving.

The technical scheme is as follows: in order to achieve the above purpose, the power transmission system of the electric power-assisted bicycle of the utility model comprises a motor core; the first transmission shaft, the second transmission shaft, the output gear and the five-way shaft are rotatably arranged in the case through bearings;

a section of primary driving gear shaft is arranged on a core shaft of the motor core; a primary damping plastic driven gear is synchronously installed on the first transmission shaft, and a primary driving gear shaft is meshed with the primary damping plastic driven gear; a section of secondary driving gear shaft is arranged on the first transmission shaft; a second-stage driven gear is coaxially and rotatably arranged on the second transmission shaft through a one-way bearing; the secondary driving gear shaft is meshed with the secondary driven gear;

a section of three-stage driving gear shaft is arranged on the second transmission shaft and meshed with the output gear; the five-way shaft is coaxially connected with the output gear in a transmission way through a ratchet wheel and a pawl.

Furthermore, a left positioning retaining ring and a right positioning retaining ring are respectively arranged on two sides of the one-way bearing.

Furthermore, a left cylinder and a right cylinder are respectively and coaxially and integrally arranged at two ends of the output gear; the ratchet wheel pawl is arranged in the left barrel, a needle bearing is rotationally arranged in the right barrel, and a deep groove ball bearing is coaxially and rotationally arranged between the needle bearing and the ratchet wheel pawl; the right end in the cylinder of the right cylinder is rotatably provided with a sealing ring, the middle section in the cylinder of the right cylinder is integrated and is provided with a convex ring coaxially, and the convex ring is positioned between the needle bearing and the sealing ring.

Further, a cylindrical transmission sleeve is coaxially sleeved outside the five-way shaft; a gap is formed between the inner wall of the transmission sleeve and the outer wall of the five-way shaft; the left end and the right end of the transmission sleeve are respectively and integrally provided with a left end sleeve and a right end sleeve, the left end sleeve is in transmission fit with the five-way shaft through a spline, and the right end sleeve is in fit with the inner ring of the ratchet pawl through a spline.

Further, the transmission ratio of the primary driving gear shaft to the primary damping plastic driven gear is 1: 4; the transmission ratio of the secondary driving gear shaft to the secondary driven gear is 1: 2.5; the transmission ratio of the shaft of the three-stage driving gear to the output gear is 1: 4.

Has the advantages that: the utility model has simple structure, three-level transmission structure, compact structure of the power system, more contribution to distributing transmission ratio, and the structure of adopting the one-way bearing enables the movement to be mutually separated from the five-way shaft when completely using manual driving, thereby not driving the movement of the machine core shaft and playing the labor-saving role of pure man-hour; the primary damping plastic driven gear is adopted to achieve the effects of reducing noise and vibration; the plastic gear structure effectively reduces the noise generated by the transmission between the primary driving gear shaft and the primary damping plastic driven gear, and the plastic gear also plays a certain role in vibration shielding, so that the vibration generated in the variable speed transmission process is obviously weakened at the primary damping plastic driven gear, and the stable operation of the motor is ensured.

Drawings

FIG. 1 is a schematic diagram of a transmission system.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The power transmission system of the electric power-assisted bicycle shown in the attached figure 1 comprises a motor core 1; the device also comprises a first transmission shaft 6, a second transmission shaft 7, an output gear 13 and a five-way shaft 20 which are rotatably arranged in the case through bearings; the two ends of the five-way shaft 20 of the embodiment are used for connecting bicycle pedal cranks;

a section of primary driving gear shaft 2 is arranged on a core shaft 3 of the motor core 1; the first transmission shaft 6 is synchronously provided with a primary damping plastic driven gear 4, the primary driving gear shaft 2 is meshed with the primary damping plastic driven gear 4, in order to ensure sufficient reliability, the primary damping plastic driven gear 4 of the embodiment is made of MC nylon, in order to improve the overall transmission reliability, other gears of the device are metal gears with better mechanical property, the primary transmission adopts a plastic gear structure to effectively reduce the noise generated by transmission between the primary driving gear shaft 2 and the primary damping plastic driven gear 4, and the plastic gears also play a certain role of vibration shielding, so that the vibration generated in the variable speed transmission process is obviously weakened at the primary damping plastic driven gear 4, and the stable operation of the motor is ensured; a section of secondary driving gear shaft 5 is arranged on the first transmission shaft 6; a secondary driven gear 16 is coaxially and rotatably arranged at the middle position of the second transmission shaft 7 through a one-way bearing 9, the one-way bearing 9 in the embodiment is a one-way needle bearing, and a left positioning retaining ring 8 and a right positioning retaining ring 15 are respectively arranged on two sides of the one-way bearing 9 in the embodiment to limit the one-way gear; the secondary driving gear shaft 5 is meshed with the secondary driven gear 16; a section of three-stage driving gear shaft 14 is arranged on the second transmission shaft 7, and the three-stage driving gear shaft 14 is meshed with the output gear 13; the five-way shaft 20 is coaxially connected with the output gear 13 through a ratchet pawl 10 in a transmission way; when the power-assisted bicycle is completely driven by manpower, the movement 1 does not run, the five-way shaft 20 is driven to rotate by manpower pedal at the moment, the second transmission shaft 7 can be separated from the second-stage driven gear 16 by the one-way bearing 9 due to the active rotation of the five-way shaft 20, the rotation of the second transmission shaft 7 cannot be transmitted to the first transmission shaft 6 at the moment, and then the movement cannot be dragged to rotate, so that the power-saving effect is achieved.

The two ends of the output gear 13 are respectively and coaxially and integrally provided with a left cylinder 91 and a right cylinder 92, the right cylinder of the embodiment is provided with a bicycle chain toothed disc, and the chain toothed disc is in transmission connection with a chain; the ratchet pawl 10 is arranged in the left barrel 91, a needle bearing 12 is rotationally arranged in the right barrel 92, and a deep groove ball bearing 11 is coaxially and rotationally arranged between the needle bearing 12 and the ratchet pawl 10; the right end in the right cylinder 92 is rotatably provided with a sealing ring 17, the middle section in the cylinder of the right cylinder 92 is integrally and coaxially provided with a convex ring 98, the convex ring 98 is positioned between the needle roller bearing 12 and the sealing ring 17, and the convex ring 98 plays an axial positioning role for the needle roller bearing 12 and the sealing ring 17.

A cylindrical transmission sleeve 19 is coaxially sleeved outside the five-way shaft 20; a gap 101 is formed between the inner wall of the transmission sleeve 19 and the outer wall of the five-way shaft 20; the left end and the right end of the transmission sleeve 19 are respectively and integrally provided with a left end sleeve 21 and a right end sleeve 18, the left end sleeve 21 is in transmission fit with the five-way shaft 20 through a spline 102, and the right end sleeve 18 is in spline fit with the inner ring of the ratchet pawl 10; the transmission sleeve 19 can transmit the torque force on the five-way shaft to enable the stress of the five-way shaft 20 to be more uniform, in addition, a strain gauge can be attached to the transmission sleeve 19 of the embodiment, the change of the bridge resistance value of the strain gauge is caused after the transmission sleeve 19 is subjected to tiny deformation caused by the torque, and the change of the resistance of the strain bridge is converted into the change of an electric signal so as to realize torque measurement; the torque sensor converts the torque borne by the transmission sleeve 19 into static torque, and then the strain gauge can calculate the torque borne by the five-way shaft by detecting the strain on the transmission sleeve 19;

the transmission ratio of the primary driving gear shaft 2 and the primary damping plastic driven gear 4 of the embodiment is 1: 4; the transmission ratio of the secondary driving gear shaft 5 to the secondary driven gear 16 is 1: 2.5; the transmission ratio of the three-stage driving gear shaft 14 to the output gear 13 is 1: 4.

The above description is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims

1. Power transmission system of electric power-assisted bicycle, its characterized in that: comprises a motor core (1); the device also comprises a first transmission shaft (6), a second transmission shaft (7), an output gear (13) and a five-way shaft (20) which are rotatably arranged in the case through bearings;

a section of primary driving gear shaft (2) is arranged on a core shaft (3) of the motor core (1); a primary damping plastic driven gear (4) is synchronously installed on the first transmission shaft (6), and the primary driving gear shaft (2) is meshed with the primary damping plastic driven gear (4); a section of secondary driving gear shaft (5) is arranged on the first transmission shaft (6); a secondary driven gear (16) is coaxially and rotatably arranged on the second transmission shaft (7) through a one-way bearing (9); the secondary driving gear shaft (5) is meshed with the secondary driven gear (16);

a section of three-stage driving gear shaft (14) is arranged on the second transmission shaft (7), and the three-stage driving gear shaft (14) is meshed with the output gear (13); the five-way shaft (20) is coaxially connected with the output gear (13) in a transmission way through a ratchet wheel pawl (10).

2. The power transmission system of an electric power assisted bicycle according to claim 1, wherein: and a left positioning retaining ring (8) and a right positioning retaining ring (15) are respectively arranged on two sides of the one-way bearing (9).

3. The power transmission system of an electric power assisted bicycle according to claim 1, wherein: two ends of the output gear (13) are respectively and coaxially and integrally provided with a left cylinder (91) and a right cylinder (92); the ratchet wheel pawl (10) is arranged in the left barrel (91), a needle bearing (12) is rotationally arranged in the right barrel (92), and a deep groove ball bearing (11) is coaxially and rotationally arranged between the needle bearing (12) and the ratchet wheel pawl (10); the right end in the right barrel (92) is rotatably provided with a sealing ring (17), the middle section in the right barrel (92) is integrally and coaxially provided with a convex ring (98), and the convex ring (98) is positioned between the needle bearing (12) and the sealing ring (17).

4. The power transmission system of an electric power assisted bicycle according to claim 1, wherein: a cylindrical transmission sleeve (19) is coaxially sleeved outside the five-way shaft (20); a gap (101) is formed between the inner wall of the transmission sleeve (19) and the outer wall of the five-way shaft (20); the left end and the right end of the transmission sleeve (19) are respectively and integrally provided with a left end sleeve (21) and a right end sleeve (18), the left end sleeve (21) is in transmission fit with the five-way shaft (20) through a spline (102), and the right end sleeve (18) is in transmission fit with an inner ring of the ratchet pawl (10) through a spline.

5. The power transmission system of an electric power assisted bicycle according to claim 1, wherein: the transmission ratio of the primary driving gear shaft (2) to the primary damping plastic driven gear (4) is 1:4, the transmission ratio of the secondary driving gear shaft (5) to the secondary driven gear (16) is 1: 2.5, the transmission ratio of the three-stage driving gear shaft (14) to the output gear (13) is 1: 4.