CN213511940U - Power transmission structure of electric motorcycle - Google Patents

Abstract

The utility model discloses an electric motorcycle car's power transmission structure, which comprises a motor, the motor includes a motor shaft, the left end portion that the motor shaft is located outside the motor has integrated integrative drive gear, drive gear meshes with an at least driven gear mutually, drive gear and driven gear constitute a gear reduction box jointly. The motor also comprises a shell, a left end cover and a right end cover, wherein the left end cover and the right end cover are used for being rotatably connected with two ends of the motor shaft through motor bearings fixed on the left end cover and enabling a driving gear at the left end part of the motor shaft to protrude out of the left end cover so as to enable the motor shaft to be arranged in a suspended mode. The device has compact and simple structure, reduces the occupied space and improves the transmission stability.

Description

Power transmission structure of electric motorcycle

Technical Field

The utility model belongs to the technical field of the vehicle and specifically relates to an electric motorcycle car's power transmission structure is related to.

Background

In the era that the global traffic industry is accelerating to the direction of intellectualization and electromotion, the high-power electric vehicle becomes a great trend and is the new strength of the electric vehicle market. In order to ensure the controllability of the high-power electric vehicle, the middle-mounted motor is the best choice of the high-power electric vehicle, the center of gravity of the middle-mounted motor is arranged in the middle of the vehicle, when the vehicle runs at a higher speed, the front and rear shock absorption bearing is more balanced, better control feeling can be obtained, and therefore the middle-mounted motor electric vehicle can meet more speed change conditions.

The traditional middle motor transmission case is usually designed to be open, as shown in fig. 1, the power transmission mode is that the motor 1 transmits kinetic energy through a gear reduction box 11, and a driving chain wheel is fixed on a power output shaft of the gear reduction box to drive a driven chain wheel fixed on a rear wheel hub to rotate by a driving chain. The transmission mode is similar to a straddle type motorcycle, and a chain tensioner is required to be arranged on a rear fork and used for adjusting the position of a rear wheel so as to adjust the tightness of a chain.

In order to reduce the development cost of the motor, the existing specification of a manufacturer is usually selected, a motor end cover and a right box of a gear reduction box are in flange face lap joint and are fastened by bolts, as shown in figure 2, a coupling sleeve 13 and a spring 14 are designed at the output end of a motor shaft 12, the motor shaft is connected with a pinion shaft 15 through the coupling sleeve, and the spring is placed to prevent the coupling sleeve from moving to cause knocking noise; two ends of the pinion shaft and the big gear shaft are supported by bearings; the gear box is filled with lubricating oil, so that the meshing friction of the gears is reduced, the power loss is reduced, and the meshing noise is reduced.

The traditional middle-mounted motor power transmission mechanism has the following defects:

1. chain drive is open, if be drawn into the foreign matter, has the dead potential safety hazard that leads to falling the car of transmission card.

2. The rear fork needs to be matched, the chain tensioner is arranged on the rear fork, the locking nut of the rear wheel needs to be unscrewed in the adjusting mode, and the adjustment mode needs to be checked irregularly and is complex.

3. The gear reduction box has a plurality of parts, and the right box 16 has a larger volume and occupies more axial space for placing the coupling sleeve.

4. The higher the motor power is, the larger the motor power is, and the selection of the motor power is greatly limited due to more occupied axial space and the requirements on the side inclination angle limitation and the controllability of the whole vehicle.

In summary, in order to meet the market demand for high-power electric motorcycles and ensure light, compact and simple power transmission structure, a completely new power transmission structure needs to be invented.

Disclosure of Invention

In view of the above, it is necessary to provide a power transmission structure of an electric motorcycle, which has a light weight transmission structure and a compact and simple structure.

In order to solve the technical problem, the technical scheme of the utility model is that: the power transmission structure of the electric motorcycle comprises a motor, wherein the motor comprises a motor shaft, the left end part of the motor shaft, which is positioned outside the motor, is an integrated driving gear, the driving gear is meshed with at least one driven gear, and the driving gear and the driven gear jointly form a gear reduction box.

Furthermore, the motor also comprises a shell, a left end cover and a right end cover, wherein the left end cover and the right end cover are used for being rotatably connected with two ends of the motor shaft through motor bearings fixed on the left end cover and enabling a driving gear on the left end part of the motor shaft to protrude out of the left end cover so as to enable the motor shaft to be arranged in a suspended mode.

Furthermore, the motorcycle rear wheel transmission device further comprises a belt transmission case, wherein the belt transmission case comprises a driving wheel in transmission connection with the output end of the gear reduction box, a driven wheel in transmission connection with the rear wheel of the motorcycle, and a belt in transmission connection with the driving wheel and the driven wheel.

Furthermore, the gear reduction box also comprises a box body connected to the frame of the motorcycle, and the box body covers the driving gear and the driven gear.

Furthermore, the box body is fixedly connected with a box cover, and the box body and the box cover form a closed space for covering the driving wheel, the driven wheel and the belt.

Furthermore, the box body and the box cover bear the motion of a rear wheel and replace a rear fork to do swing arm motion.

Furthermore, the box body and the motor are both provided with suspension holes connected with the frame in a suspension manner.

Furthermore, the axle center of the driving wheel is offset from the axle center connecting line of the motor shaft and the driven wheel.

Furthermore, the rear part of the box body is provided with a protruding part, and a rear wheel bearing used for rotatably connecting a rear wheel shaft of the motorcycle is fixedly connected in the protruding part.

Furthermore, a bearing pressing plate for preventing the rear wheel axle from axially moving is fixedly connected in the box body.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the transmission sequence of the device is that the motor shaft rotates, the motor shaft is decelerated by the gear and then drives the rear wheel shaft by the belt, the transmission sequence from the belt to the gear reduction box similar to a fuel scooter is not adopted, the belt transmission design is placed behind the gear reduction box, the rotating speed of the belt is low, the service life of the belt is prolonged, the torque of the rear wheel shaft is large, and the load capacity of the whole vehicle is improved.

2. The box body and the box cover the gear box, parts such as a driving wheel, a belt and a driven wheel of the belt transmission box are also accommodated, and the box body and the box cover replace a traditional rear fork to do swing arm movement and bear rear wheel movement, so that the structural strength is reliable.

3. The motor shaft integrated with the pinion does not need to be connected by a coupling sleeve, and the right box of the original reduction gearbox is integrated with the left end cover of the motor, so that the axial space is reduced, and the structure arrangement and the selection of a high-power motor are facilitated.

4. The pinion of the motor shaft integrated with the pinion is in a suspension type design, a bearing is not needed for supporting, and compared with a traditional power transmission mechanism, the number of parts of the gear reduction box is reduced greatly.

5. The belt transmission case is designed in a closed manner, namely, the case cover is fastened on the case body through bolts to form a closed space, so that the belt transmission case is completely dustproof and waterproof, and the service life of a belt is prolonged.

6. The belt transmission case is designed in an eccentric mode, namely the center of the driving wheel is upwards deviated from the center connecting line of the motor and the driven wheel, and the eccentric design of the driving wheel is beneficial to the spatial arrangement of the belt tensioning mechanism, so that the structure is light.

In order to make the aforementioned and other objects, features and advantages of the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a schematic structural diagram of a motor and a gear box in the prior art.

Fig. 3 is a top view of an embodiment of the present invention.

Fig. 4 is a side view of an embodiment of the present invention.

In the figure: 1-existing motor, 11-existing gear reduction box, 12-existing motor shaft, 13-coupling sleeve, 14-spring, 15-pinion shaft, 16-right box, 2-application motor, 21-motor shaft, 22-right end cover, 23-left end cover, 24-motor bearing, 25-driving gear, 3-gear reduction box, 31-driven gear, 32-driven gear shaft, 33-box, 4-belt transmission box, 41-box cover, 42-driving gear, 43-driven gear, 44-belt, 45-rear wheel bearing, 46-bearing press plate, 5-rear wheel shaft, 6-suspension hole, 7-belt tensioning mechanism.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 3-4, a power transmission structure of an electric motorcycle comprises a motor 2, a gear reduction box 3 and a belt transmission box 4.

The motor 2 comprises a housing, a motor shaft 21, a left end cover 23 and a right end cover 22, wherein the left end cover 23 and the right end cover 22 are respectively fixedly connected to two ends of the housing, the left end cover 23 and the right end cover 22 are used for rotatably connecting two ends of the motor shaft 21 through a motor bearing 24 fixed on the left end cover 23, and the left end of the motor shaft 21 protrudes out of the left end cover 23, so that the motor shaft 21 is arranged in a suspended manner. The left end of the motor shaft 21 outside the motor is integrated with a driving gear 25. The driving gear can be processed on the motor shaft in an integrated forming mode, and can also be manufactured in a split press-fitting mode.

The floating design of the motor shaft 21 and the integrated drive gear 25 allows the device to be of a more traditional construction, reducing a number of parts, as shown in the following table:

as can be seen from the above table, compared with the existing structure, the device uses 5 fewer parts, and simultaneously has simplified structure and reduced volume.

The motor left end cover 23, the box body 33, the driving gear 25, the driven gear shaft 32 and the driven gear 31 jointly form a gear reduction box 3; the driven gear 31 is fixed on the driven gear shaft 32 in a spline connection manner; the gear reduction box has a box body 33, and the box body 33 is connected to the motorcycle frame to cover the driving gear 25 and the driven gear 31. In this embodiment, drive gear 25's the number of teeth is less than driven gear 31's the number of teeth, and driven gear 31's quantity is one, and one-level meshing gear through fixed reduction ratio transmits kinetic energy to belt transmission case, and this gear reduction box's part quantity is still less and the volume is littleer, is favorable to arranging of power transmission structure and chooseing for use of high power motor. The drive gear of integration on the motor shaft is as the pinion, need not the shaft coupling cover and does the connection, and the motor left end lid is integrated to original reducing gear box right side case, reduces axial space, more is favorable to the chooseing for use of structural arrangement and high power motor.

The belt transmission case 4 comprises a case cover 41 fixedly connected to the case body, a driving wheel 42 in transmission connection with a driven gear shaft, a driven wheel 43 in transmission connection with a rear wheel of the motorcycle, and a belt 44 in transmission connection with the driving wheel and the driven wheel. The case 33 and the case cover 41 constitute a closed space that covers the driving pulley 42, the driven pulley 43, and the belt 44. The complete dustproof and waterproof effect is realized, and the service life of the belt is prolonged.

The box body 33 and the box cover 41 are made of aluminum alloy, and have the functions of covering the gear box and accommodating the driving wheel, the belt, the driven wheel and other parts of the belt transmission box, and the box body and the box cover replace the traditional rear fork to do swing arm movement and bear rear wheel movement.

In this embodiment, the box 33 and the motor 2 are both provided with suspension holes 6 connected to the frame.

In this embodiment, the axis of the driving wheel 42 is higher than the axis connecting line of the motor shaft 21 and the driven wheel 43. The belt tensioning mechanism 7 is favorable for arrangement and light transmission structure.

In this embodiment, the rear portion of the housing 33 has a protruding portion, and a rear wheel bearing 45 for rotatably connecting the rear wheel shaft 5 of the motorcycle is fixedly connected to the protruding portion. The tail of the box body 33 is designed to be convex, so that the rear wheel shaft and the rear wheel bearings 45 at the two ends of the rear wheel shaft can be better placed, and the assembly is simpler and more convenient.

In this embodiment, a bearing retainer 46 for preventing the rear axle from moving axially is fixedly connected to the interior of the housing 33. The bearing pressing plate 46 is fastened to the case 33 by bolts, so that axial play of the rear wheel axle 5 is avoided, a noise source is reduced, and transmission efficiency is more stable.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.

Claims (10)

1. A power transmission structure of an electric motorcycle is characterized in that: the motor comprises a motor, the motor comprises a motor shaft, the left end part of the motor shaft, which is positioned outside the motor, is an integrated driving gear, the driving gear is meshed with at least one driven gear, and the driving gear and the driven gear jointly form a gear reduction box.

2. The power transmission structure of an electric motorcycle according to claim 1, characterized in that: the motor also comprises a shell, a left end cover and a right end cover, wherein the left end cover and the right end cover are used for being rotatably connected with two ends of the motor shaft through motor bearings fixed on the left end cover and enabling the driving gear on the left end part of the motor shaft to protrude out of the left end cover so as to enable the motor shaft to be arranged in a suspended mode.

3. The power transmission structure of an electric motorcycle according to claim 1, characterized in that: the motorcycle rear wheel transmission device is characterized by further comprising a belt transmission case, wherein the belt transmission case comprises a driving wheel in transmission connection with the output end of the gear reduction box, a driven wheel in transmission connection with the motorcycle rear wheel, and a belt in transmission connection with the driving wheel and the driven wheel.

4. The power transmission structure of an electric motorcycle according to claim 3, characterized in that: the gear reduction box also comprises a box body connected to the frame of the motorcycle, and the box body covers the driving gear and the driven gear.

5. The power transmission structure of an electric motorcycle according to claim 4, characterized in that: the box body is fixedly connected with a box cover, and the box body and the box cover form a closed space for covering the driving wheel, the driven wheel and the belt.

6. The power transmission structure of an electric motorcycle according to claim 5, characterized in that: the box body and the box cover bear the motion of the rear wheel and replace a rear fork to do swing arm motion.

7. The power transmission structure of an electric motorcycle according to claim 5, characterized in that: and the box body and the motor are both provided with suspension holes connected with the frame in a suspension manner.

8. The power transmission structure of an electric motorcycle according to claim 5, characterized in that: the axle center of the driving wheel is offset from the axle center connecting line of the motor shaft and the driven wheel.

9. The power transmission structure of an electric motorcycle according to claim 5, characterized in that: the rear part of the box body is provided with a protruding part, and a rear wheel bearing used for rotatably connecting a rear wheel shaft of the motorcycle is fixedly connected in the protruding part.

10. The power transmission structure of an electric motorcycle according to claim 9, characterized in that: and a bearing pressing plate for preventing the rear wheel shaft from axially moving is fixedly connected in the box body.

Images