Coaxial transmission structure of chain wheel output shaft and bottom fork shaft of electric motorcycle

Abstract

The utility model provides an electric motorcycle chain wheel output shaft and bottom fork shaft coaxial transmission structure which comprises a frame plate, a right frame plate, a middle motor and a reduction gearbox, and a two-stage reduction transmission mechanism is arranged in the reduction gearbox. A bottom fork shaft is fixedly installed between the left frame plate and the right frame plate, a transmission shaft sleeve is sleeved outside the bottom fork shaft, a final-stage reduction gear is installed on the transmission shaft sleeve, small chain wheels are respectively and fixedly sleeved at two ends of the transmission shaft sleeve, and the small chain wheels are connected with large chain wheels, so that a motorcycle frame, a bottom fork and a reduction mechanism are connected into a whole through the same bottom fork shaft. A larger transmission ratio is achieved through the two-stage speed reduction transmission mechanism, and the output torque is increased; the center of the small chain wheel and the center of the bottom fork shaft are adjusted to be coherent through two-stage transmission, and the small chain wheel and the bottom fork shaft are connected into a whole through the same bottom fork shaft, so that the overall structural strength is higher, the movement is more reliable, and the conditions of transmission failure during large-torque output, damage and oil leakage due to the fact that the large-torque output box body bears large bending moment are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric motorcycle related technical field, especially a kind of transmission structure of electric motorcycle sprocket output shaft and flat fork shaft coaxial. BACKGROUND

[0002] The connection mode of the existing electric motorcycle sprocket output shaft and flat fork shaft has two kinds: the first primary transmission mode is that motor is driven to rear pulley by belt, and the large sprocket is transmitted by chain in the coaxial mode of small sprocket and flat fork shaft, the structure is prone to cause the slip between belt and pulley or belt breakage under the condition of large torque, which can cause transmission failure;The second primary transmission mode is that motor is transmitted to small sprocket by gear, the center of small sprocket is coaxial with flat fork shaft, but the center of small sprocket is disconnected with the installation center of flat fork shaft, which causes the reduction gearbox to bear larger bending moment when bearing large torque output, and the reduction gearbox can be damaged and oil leakage. SUMMARY

[0003] The utility model aims at providing a kind of transmission structure of electric motorcycle sprocket output shaft and flat fork shaft coaxial, small sprocket is coaxial with flat fork shaft, and the center of small sprocket is coherent with the center of flat fork shaft, reliable structure, avoid the damage and oil leakage of reduction gearbox, transmission precision is high, can continuously and stably provide power output for electric motorcycle.

[0004] Therefore, the utility model adopts the technical scheme that a kind of transmission structure of electric motorcycle sprocket output shaft and flat fork shaft coaxial, including the motorcycle frame consisting of left frame plate and right frame plate, the motorcycle frame is provided with middle motor, the output end of the middle motor is connected with reduction gearbox, the two-stage reduction transmission mechanism consisting of primary reduction gear, intermediate gear, final reduction gear is set in the reduction gearbox, and the primary reduction gear is driven by the middle motor;Flat fork shaft is fixedly installed between the left frame plate and the right frame plate, the transmission shaft sleeve is sleeved with the first bearing outside the flat fork shaft, the final reduction gear of left and right two is fixedly installed on transmission shaft sleeve, and the second bearing is installed between transmission shaft sleeve and reduction gearbox, the both ends of transmission shaft sleeve are fixedly sleeved with small sprocket, and the large sprocket is connected with small sprocket by transmission chain, so that the motorcycle frame, flat fork, reduction mechanism are connected as a whole by the same flat fork shaft.

[0005] As the preferred of the above scheme, the flat fork includes left flat fork and right flat fork, the liner tube is sleeved on the flat fork shaft, the liner tube is located between the flat fork shaft and the transmission shaft sleeve, the liner tube is centrally arranged, the left end of the flat fork shaft is sequentially sleeved with the left flat fork liner sleeve, the left flat fork, the left frame plate and the locking nut, and the right end of the flat fork shaft is sequentially sleeved with the right flat fork liner sleeve, the right flat fork, the right frame plate and the locking nut.

[0006] Further preferably, the left fork bushing, the right fork bushing and the bushing tube are provided with end faces and / or steps for preventing the first bearing from axially moving at both ends of the fork shaft.

[0007] Further preferably, the first bearing is a double-row ball bearing or a needle bearing, and the second bearing is a bush bearing.

[0008] The utility model discloses the beneficial effect that: through primary reduction gear, intermediate gear, last stage reduction gear constitute two-stage reduction transmission mechanism, can realize greater transmission ratio, increase the torque of output, simultaneously, through two-stage transmission to adjust the center of small sprocket and the center of fork shaft is coherent, and combines motorcycle frame, fork, reduction mechanism through the structure of same fork shaft and is connected as a whole, makes the overall structure higher, movement is more reliable, further avoids the transmission failure when the big torque output, and the condition of breakage and oil leakage because of the big torque output box body, bears the bigger bending moment. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 It is the front view of the utility model.

[0010] Fig. 2 It is the plan view of the utility model. DETAILED DESCRIPTION

[0011] The utility model will be further described below in connection with the drawings and examples.

[0012] As Figs. 1-2 The utility model discloses a transmission structure that electric motorcycle sprocket output shaft and fork shaft are coaxial, including the motorcycle frame that is composed of left frame plate 1 and right frame plate 2, be provided with the middle motor 3 on the motorcycle frame, and the middle motor 3 output end is connected with reduction box 4 (because adopts the middle motor 3, can be provided with reduction box 4 and the transmission component connected with reduction box 4 on the left and right sides of middle motor 3, this is prior art, here no longer repeat), and reduction box 4 is provided with two-stage reduction transmission mechanism that is composed of primary reduction gear 5, intermediate gear 6, last stage reduction gear 7 in, and primary reduction gear 5 is driven by middle motor 3, can realize greater total transmission ratio through the transmission of two-stage reduction transmission mechanism, increase the torque of output, satisfy the demand of speed and torque to different equipment, realize higher transmission efficiency in smaller space, can scatter load to multiple gears, reduce the wear of single gear, prolong the service life, improve the stability and reliability of transmission simultaneously.

[0013] The left frame plate 1 and the right frame plate 2 are fixedly installed with a flat fork shaft 8, the flat fork shaft 8 is sleeved with a transmission shaft sleeve 9 through a first bearing 16, two last-stage reduction gears 7 are fixedly installed on the transmission shaft sleeve 9 respectively, and a second bearing 17 is installed between the transmission shaft sleeve 9 and the reduction box 4, both ends of the transmission shaft sleeve 9 are fixedly sleeved with small chain wheels 10, the small chain wheels 10 are connected with a large chain wheel 18 through a transmission chain 11, so that the motorcycle frame, the flat fork and the reduction mechanism are connected as a whole through the same flat fork shaft 8. The first bearing 16 is a double-row ball bearing or a needle bearing, and the second bearing 17 is a shaft sleeve bearing. The rotation of the small chain wheels 10 on the transmission shaft sleeve 9 is driven by the transmission of the reduction box 4, the center of the small chain wheels 10 is connected with the center of the flat fork shaft 8, and the motorcycle frame, the flat fork and the reduction mechanism are connected as a whole through the same flat fork shaft 8, so that the overall structural strength is higher, the movement is more reliable, the problems of slippage between the belt and the belt wheel or belt fracture under a large torque, causing transmission failure, and the damage and oil leakage of the reduction box 4 under a large torque output are further avoided.

[0014] The flat fork includes a left flat fork 12 and a right flat fork 14, a bushing 19 is sleeved on the flat fork shaft 8, the bushing 19 is located between the flat fork shaft 8 and the transmission shaft sleeve 9, the bushing 19 is centrally arranged, the left end of the flat fork shaft 8 is sequentially sleeved with a flat fork left bushing 13, the left flat fork 12, the left frame plate 1 and a locking nut, and the right end of the flat fork shaft 8 is sequentially sleeved with a flat fork right bushing 15, the right flat fork 14, the right frame plate 2 and a locking nut. The left flat fork 12 and the right flat fork 14 axially fix the flat fork shaft 8. The flat fork left bushing 13, the flat fork right bushing 15 and the bushing 19 are used for preventing the first bearing 16 at both ends of the flat fork shaft 8 from axially moving through an end face and / or a step.

[0015] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, the scope of the utility model is defined by the claims and its equivalents.

Claims

1. A transmission structure for coaxially connecting the output shaft of an electric motorcycle chain wheel and the axle of a flat fork, comprising a motorcycle frame composed of a left frame plate (1) and a right frame plate (2), wherein a middle motor (3) is arranged on the motorcycle frame, and a reduction box (4) is connected to the output end of the middle motor (3), characterized in that: The reduction gearbox (4) is provided with two-stage reduction transmission mechanism composed of primary reduction gear (5), intermediate gear (6), final reduction gear (7), the primary reduction gear (5) is driven by the middle motor (3); The left frame plate (1), right frame plate (2) between fixedly installed with flat fork shaft (8), the flat fork shaft (8) outside through the first bearing (16) is sleeved with transmission shaft sleeve (9), left and right two final reduction gear (7) is fixedly installed on transmission shaft sleeve (9), and transmission shaft sleeve (9) and reduction gearbox (4) between installed with second bearing (17), both ends of transmission shaft sleeve (9) are fixedly sleeved with small chain wheel (10), the small chain wheel (10) is connected with large chain wheel (18) through transmission chain (11), so that the motorcycle frame, flat fork, reduction mechanism are connected into an organic whole through the same flat fork shaft (8).

2. The transmission structure of claim 1, wherein: The flat fork includes left flat fork (12) and right flat fork (14), the flat fork shaft (8) is sleeved with bushing (19), the bushing (19) is located between the flat fork shaft (8) and the transmission shaft sleeve (9), the bushing (19) is centrally arranged, the left end of the flat fork shaft (8) is sequentially sleeved with flat fork left bushing (13), left flat fork (12), left frame plate (1) and lock nut, the right end of the flat fork shaft (8) is sequentially sleeved with flat fork right bushing (15), right flat fork (14), right frame plate (2) and lock nut.

3. The transmission structure of claim 2, wherein: The flat fork left bushing (13), flat fork right bushing (15) and bushing (19) are prevented from axial movement of the first bearing (16) at both ends of the flat fork shaft (8) through end face and / or step.

4. The transmission structure of claim 1, wherein: The first bearing (16) adopts double row ball bearing or needle bearing, and the second bearing (17) adopts sleeve bearing.

Images