JP3244942U - Drive unit and tricycle - Google Patents

Abstract

A drive unit for cooling an electric motor is provided. A drive unit 100 is configured to be mounted on a vehicle such as a motorcycle or a tricycle. The drive unit comprises a drive shaft 6 and an electric motor 2 arranged rearward with respect to the drive shaft. [Selection diagram] Figure 2

Description

The present invention relates to a drive unit and a tricycle.

A motorcycle or three-wheeled vehicle has an internal combustion engine, a drive shaft, and a continuously variable transmission. For example, the drive unit of the motorcycle disclosed in Patent Document 1 includes an internal combustion engine, a continuously variable transmission, a reduction gear train, and a chain type transmission means. The internal combustion engine is supported by a frame. A continuously variable transmission, a reduction gear train, and a chain type transmission means are arranged between the internal combustion engine and the drive wheels. The power output by the internal combustion engine is transmitted to the drive wheels via a continuously variable transmission, a reduction gear train, and a chain-type electric means.

JP2004-218731A

When an electric motor is used instead of an internal combustion engine as the drive source for the drive unit described above, it is preferable to cool the drive source. Therefore, an object of the present invention is to provide a drive unit that can cool an electric motor.

The drive unit according to the first aspect is configured to be mounted on a vehicle that is a motorcycle or a tricycle. The drive unit includes a drive shaft and an electric motor arranged rearward with respect to the drive shaft.

According to this configuration, the electric motor is arranged rearward with respect to the drive shaft. In a motorcycle or three-wheeled vehicle, there are few components placed behind the drive shaft, so by placing the electric motor rearward with respect to the drive shaft, the exposure of the electric motor to the atmosphere can be increased. As a result, the electric motor can be further cooled.

The drive unit according to the second aspect is the same as the drive unit according to the first aspect, further including a continuously variable transmission. The continuously variable transmission is configured to transmit torque between a drive shaft and an electric motor. The continuously variable transmission includes a driving pulley device, a driven pulley device, and a transmission member. The drive pulley device is connected to an electric motor. The driven pulley device is arranged in front of the drive pulley device. The transmission member is configured to transmit torque between the drive pulley device and the driven pulley device.

The drive unit according to the third aspect is configured as follows in the drive unit according to the second aspect. The continuously variable transmission is arranged above the drive shaft.

The drive unit according to the fourth aspect is the drive unit according to any one of the first to third aspects, further including a differential gear. The differential gear is configured to transfer torque between the electric motor and the drive shaft. The electric motor is arranged rearward with respect to the differential gear.

The drive unit according to the fifth aspect is the drive unit according to the fourth aspect further including a continuously variable transmission. The continuously variable transmission is configured to transmit torque between a drive shaft and an electric motor. The differential gear is arranged on the same side of the continuously variable transmission as the electric motor in the width direction of the vehicle.

The drive unit according to the sixth aspect is the drive unit according to the fifth aspect further including a reduction gear. The speed reducer is configured to transmit torque between the continuously variable transmission and the differential gear. The differential gear is arranged below the reduction gear.

A tricycle according to a seventh aspect includes a drive wheel and a drive unit according to any one of the first to sixth aspects. The drive unit is configured to drive the drive wheels.

According to the present invention, an electric motor can be cooled.

A side view of a tricycle equipped with a drive unit. A side view of the drive unit. FIG. 3 is a plan view of the drive unit. FIG. 3 is a sectional view taken along the line IV-IV in FIG. 2.

Hereinafter, a drive unit 100 and a tricycle 101 according to the present embodiment will be described with reference to the drawings. FIG. 1 is a side view showing a tricycle 101 on which a drive unit 100 is mounted. As shown in FIG. 1, the tricycle 101 includes a drive unit 100 and a pair of drive wheels 102. Drive unit 100 is configured to drive each drive wheel 102. Note that in this embodiment, each drive wheel 102 is a rear wheel.

2 is a side view of the drive unit 100, and FIG. 3 is a plan view of the drive unit 100. As shown in FIGS. 2 and 3, the drive unit 100 includes an electric motor 2, a continuously variable transmission 3, a speed reducer 4, a differential gear 5, and a pair of drive shafts 6. The drive unit 100 is mounted on a tricycle.

<Electric motor>
The electric motor 2 is arranged rearwardly with respect to each drive shaft 6. Further, the electric motor 2 is arranged at the rear with respect to the differential gear 5. The electric motor 2 is arranged above each drive shaft 6. Electric motor 2 functions as a drive source for drive unit 100 . The electric motor 2 is, for example, an AC synchronous motor. Note that the drive unit 100 has only the electric motor 2 as a drive source. That is, drive unit 100 does not have an internal combustion engine as a drive source. Although the drive unit 100 does not have an internal combustion engine in this embodiment, it may have an internal combustion engine used for power generation.

As shown in FIG. 4, the electric motor 2 includes a motor case 21, a stator 22, a rotor 23, and a first output shaft 24. The electric motor 2 in this embodiment is a so-called inner rotor type motor. The electric motor 2 has an inverter (not shown) for controlling the rotation speed of the electric motor 2.

The motor case 21 is fixed to a pulley case 310 or the like and cannot rotate. A stator 22 and a rotor 23 are housed within this motor case 21 .

Stator 22 is fixed to the inner peripheral surface of motor case 21 . Stator 22 is non-rotatable. The rotor 23 is rotatably arranged. The rotor 23 is arranged inside the stator 22. The stator 22 is spaced apart from the rotor 23.

The first output shaft 24 rotates integrally with the rotor 23. The first output shaft 24 extends toward the continuously variable transmission 3. The first output shaft 24 is rotatably supported by a plurality of bearings.

<Continuously variable transmission>
As shown in FIG. 2, the continuously variable transmission 3 is configured to transmit torque between the electric motor 2 and each drive shaft 6. Specifically, the continuously variable transmission 3 is configured to transmit torque between the electric motor 2 and the reduction gear 4. The continuously variable transmission 3 is arranged above each drive shaft 6.

As shown in FIG. 4, the continuously variable transmission 3 includes a driving pulley device 31, a driven pulley device 32, and a belt 33 (an example of a transmission member).

The drive pulley device 31 is connected to the electric motor 2 . That is, the torque output by the electric motor 2 is transmitted to the drive pulley device 31. The drive pulley device 31 includes a first fixed sheave 311, a first movable sheave 312, a first fixed boss 313, and a plurality of weight rollers 314.

The first fixed sheave 311 and the first movable sheave 312 are arranged to face each other. The first fixed sheave 311 is immovable in the axial direction of the drive pulley device 31. On the other hand, the first movable sheave 312 is movable in the axial direction of the drive pulley device 31 so as to approach and move away from the first fixed sheave 311.

The first fixed boss 313 extends from the first fixed sheave 311 toward the electric motor 2 . The first fixed boss 313 rotates integrally with the first fixed sheave 311. Further, the first fixed boss 313 rotates integrally with the first movable sheave 312. The first movable sheave 312 slides on the first fixed boss 313 in the axial direction of the drive pulley device 31. The first fixing boss 313 has a cylindrical shape. The first output shaft 24 extends within the first fixed boss 313 . The first fixed boss 313 rotates integrally with the first output shaft 24. Note that the first fixed boss 313 and the first output shaft 24 may be connected via another member.

The plurality of weight rollers 314 are configured to press the first movable sheave 312 toward the first fixed sheave 311. Specifically, when the electric motor 2 rotates and the drive pulley device 31 rotates, centrifugal force is generated in the weight roller 314, and the weight roller 314 moves radially outward of the drive pulley device 31. As a result, the weight roller 314 presses the first movable sheave 312 toward the first fixed sheave 311.

The belt 33 is wrapped around a driving pulley device 31 and a driven pulley device 32. The belt 33 transmits torque between the drive pulley device 31 and the driven pulley device 32.

The driven pulley device 32 includes a second fixed sheave 321, a second fixed boss 322, a second movable sheave 323, a movable boss 324, a spring 325, a support member 326, a nut 327, and a second output shaft 328.

The driven pulley device 32 is arranged in front of the drive pulley device 31. Torque is transmitted to the driven pulley device 32 from the drive pulley device 31 . That is, torque from the driving pulley device 31 is transmitted to the driven pulley device 32 via the belt 33. The driven pulley device 32 is arranged along the driving pulley device 31 in the horizontal direction. That is, the belt 33 extends in the horizontal direction. The continuously variable transmission 3 transmits torque in the horizontal direction. Specifically, the continuously variable transmission 3 transmits torque from the rear to the front.

The second fixed sheave 321 and the second movable sheave 323 are arranged to face each other. The second fixed sheave 321 is immovable in the axial direction. On the other hand, the second movable sheave 323 is movable in the axial direction so as to approach and move away from the second fixed sheave 321.

The second fixed boss 322 has a cylindrical shape and extends from the second fixed sheave 321 in the axial direction. The second fixed boss 322 rotates together with the second fixed sheave 321. A portion of the tip portion (upper end portion in FIG. 4) of the second fixing boss 322 has a smaller outer diameter than the other portion. A threaded portion is formed on the outer circumferential surface of the tip of this second fixing boss 322 . A support member 326 is attached to this threaded portion. Further, in order to fix the support member 326, a nut 327 is screwed onto the threaded portion. The spring 325 is arranged between the support member 326 and the second movable sheave 323 in a compressed state. The spring 325 urges the second movable sheave 323 toward the second fixed sheave 321.

The second output shaft 328 extends inside the second fixed boss 322 in the axial direction. The second output shaft 328 is configured to output torque to the driving wheels. The second output shaft 328 rotates integrally with the second fixed boss 322. Specifically, the second output shaft 328 is spline-fitted to the second fixed boss 322 .

The movable boss 324 extends from the second movable sheave 323 in the axial direction. The movable boss 324 rotates integrally with the second movable sheave 323. Further, the movable boss 324 moves in the axial direction integrally with the second movable sheave 323.

Movable boss 324 has a cylindrical shape. The movable boss 324 is arranged radially outward with respect to the second fixed boss 322. That is, the second fixed boss 322 extends within the movable boss 324.

<Reduction gear>
As shown in FIG. 2, the reducer 4 is configured to transmit torque between the continuously variable transmission 3 and the differential gear 5. Specifically, the speed reducer 4 is configured to transmit torque between the driven pulley device 32 and the differential gear 5. The reducer 4 reduces the rotation of the second output shaft 328 of the continuously variable transmission 3 and transmits the rotation to the differential gear 5.

As shown in FIG. 3, the reducer 4 is disposed on the same side as the electric motor 2 with respect to the continuously variable transmission 3 in the width direction of the vehicle (the left-right direction of the vehicle). When viewed in the width direction, the reducer 4 overlaps the continuously variable transmission 3 (see FIG. 2).

As shown in FIG. 2, the reducer 4 includes a first gear 41, a second gear 42, and a support shaft 43. The first gear 41 is configured to rotate integrally with the second output shaft 328. The first gear 41 may be attached directly to the second output shaft 328 or may be attached indirectly.

The support shaft 43 extends parallel to the second output shaft 328. The support shaft 43 is arranged below the second output shaft 328. Further, the support shaft 43 is arranged above each drive shaft 6. That is, the support shaft 43 is arranged between the second output shaft 328 and each drive shaft 6 in the vertical direction. Specifically, the second output shaft 328, the support shaft 43, and each drive shaft 6 are arranged linearly in the vertical direction.

The second gear 42 is supported by a support shaft 43. Specifically, the second gear 42 rotates integrally with the support shaft 43. The second gear 42 meshes with the first gear 41. The second gear 42 is arranged below the first gear 41. The speed reducer 4 transmits torque in the vertical direction.

<Differential gear>
Differential gear 5 is configured to transmit torque between electric motor 2 and each drive shaft 6. Specifically, the differential gear 5 transmits torque between the reduction gear 4 and each drive shaft 6.

The differential gear 5 is arranged in front of the electric motor 2. The differential gear 5 is arranged below the reducer 4. In the vertical view, the differential gear 5 overlaps with the reduction gear 4. As shown in FIG. 3, the differential gear 5 is disposed on the same side of the continuously variable transmission 3 as the electric motor 2 and the speed reducer 4 in the vehicle width direction. As shown in FIGS. 2 and 3, the differential gear 5 serves both as the reducer 4 and as a cover. That is, each gear that constitutes the reduction gear 4 and each gear that constitutes the differential gear 5 are housed in the same case.

<Drive shaft>
Each drive shaft 6 is configured to output torque to each drive wheel 102. Specifically, each drive shaft 6 is configured to output torque to each rear wheel. A pair of drive shafts 6 extend from the differential gear 5 on both sides in the width direction. A drive wheel 102 is attached to the tip of each drive shaft 6. The drive shaft 6 is arranged below the electric motor 2 and the continuously variable transmission 3.

[Modified example]
Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various changes can be made without departing from the spirit of the present invention. Note that the following modifications can basically be applied at the same time.

(a) In the above embodiment, the drive unit 100 is mounted on a tricycle, but the drive unit 100 can also be mounted on a motorcycle. In this case, drive unit 100 does not have differential gear 5.

(b) In the above embodiment, the continuously variable transmission 3 transmits torque between the electric motor 2 and the speed reducer 4, but the drive unit 100 may not include the continuously variable transmission 3. . In this case, torque may be transmitted between the electric motor 2 and the speed reducer 4 using, for example, a chain or a belt.

(c) In the above embodiment, the electric motor 2 and the continuously variable transmission 3 are arranged above the drive shaft 6, but the configuration of the drive unit 100 is not limited to this. For example, the electric motor 2 and the continuously variable transmission 3 may be arranged at the same height as the drive shaft 6, or may be arranged below the drive shaft 6. Further, the reducer 4 and the differential gear 5 may be arranged at the same height, or the reducer 4 may be arranged below the differential gear 5.

2: Electric motor 3: Continuously variable transmission 31: Drive pulley device 32: Followed pulley device 33: Belt 4: Reducer 5: Differential gear 6: Drive shaft 100: Drive unit 101: Auto tricycle 102: Drive wheel

Claims (7)

A drive unit configured to be mounted on a vehicle that is a motorcycle or a three-wheeled vehicle,
drive shaft and
an electric motor disposed rearward with respect to the drive shaft;
A drive unit equipped with.
further comprising a continuously variable transmission configured to transmit torque between the drive shaft and the electric motor,
The continuously variable transmission is
a drive pulley device connected to the electric motor;
a driven pulley device disposed in front of the drive pulley device;
a transmission member configured to transmit torque between the drive pulley device and the driven pulley device;
has,
The drive unit according to claim 1.
The continuously variable transmission is arranged above the drive shaft,
The drive unit according to claim 2.
further comprising a differential gear configured to transmit torque between the electric motor and the drive shaft,
the electric motor is arranged rearward with respect to the differential gear;
The drive unit according to claim 1.
further comprising a continuously variable transmission configured to transmit torque between the drive shaft and the electric motor,
The differential gear is disposed on the same side of the continuously variable transmission as the electric motor in the width direction of the vehicle.
The drive unit according to claim 4.
Further comprising a speed reducer configured to transmit torque between the continuously variable transmission and the differential gear,
the differential gear is disposed below the reduction gear;
The drive unit according to claim 5.
a driving wheel;
The drive unit according to any one of claims 1 to 6, configured to drive the drive wheel;
A tricycle equipped with

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