JP2000038183A - Motorcycle drive unit with electric motor - Google Patents

Abstract

(57) Abstract: An electric motor unit is provided at a substantial center of the front and rear wheels (14, 25) and suspended from a main frame (12) extending rearward and downward from a head tube (13) supporting front wheels. 29 is provided with an electric motor and an output shaft for outputting the rotation of the electric motor, and drives a rear wheel via a sprocket at an output shaft end and a chain meshing with the sprocket;
In the electric motor unit 29, a control circuit for controlling the rotation of the electric motor is provided integrally, and the electric motor is arranged in front of the electric motor unit 29, and the rotating shaft of the electric motor is provided substantially horizontally,
A drive device for a motor-equipped two-wheeled vehicle in which a side view shape of a motor unit is made to conform to a main frame 12. [Effect] Concentration of the mass of the motor unit, downsizing of the outer shape of the motor unit, lowering of the center of gravity, improvement of the cooling property of the motor by running wind, and improvement of appearance can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a two-wheeled vehicle with a motor.

[0002]

2. Description of the Related Art Conventionally, as a motorcycle with an electric motor,
8-89483 is disclosed. In this technology, in a motorcycle, an electric motor is arranged behind a sprocket that is manually operated, a chain gear is driven by an output of the electric motor, and a rear wheel connected by the chain and the sprocket is driven.

[0003]

By the way, considering a system including a motor unit including a motor,
It is necessary to consider the concentration of the mass, the compactness of the outer shape, and the lowering of the center of gravity, and the heat generation of the motor and the appearance when the motor unit is mounted are also important.

The object of the present invention is to concentrate the mass of the motor unit, to make the outer shape of the motor unit compact,
Provided is a drive device for a two-wheeled vehicle with an electric motor, which has a lower center of gravity, and which has improved cooling of the electric motor by running wind and improved appearance.

[0005]

According to a first aspect of the present invention, there is provided an electric motor unit suspended substantially at the center of front and rear wheels from a main frame extending rearward and downward from a head tube supporting a front wheel. A motorcycle including an electric motor unit comprising: an electric motor,
An output shaft for outputting rotation of the motor is provided, and a sprocket is provided at an end of the output shaft, and a rear wheel is driven through a chain that meshes with the sprocket. And a motor is arranged at the front of the motor unit, the rotating shaft of the motor is provided substantially horizontally, and the shape of the motor unit in a side view is along the main frame.

According to the first aspect of the present invention, a control circuit for controlling the rotation of the motor is provided integrally with the motor unit so that the concentration of the mass can be reduced.
Compactness and low center of gravity can be achieved. In addition, since the motor unit is suspended on the main frame, and the motor is arranged at the front part of the vehicle body, the traveling wind easily hits the motor, cooling of the motor is effectively performed, and the motor unit moves along the main frame. Because of this shape, the appearance is improved, which contributes to the improvement of the appearance of the motorcycle, in which the appearance is important, and there is little possibility that foreign matter or the like from the front wheels enters between the frame and the motor unit.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. 1 to 3 show a first embodiment of the present invention. FIG. 1 is an overall side view of a motorcycle with an electric motor, FIG. 2 is an enlarged side view of a main part, and FIG. FIG. In FIG. 1, reference numeral 11 denotes a body frame, and a pair of left and right main frames 12, 12 each having a front end fixed to a head tube 13 extending obliquely rearward from the head tube 13, are attached to the body frame 11. ,
A cross member (not shown) is provided between the 12 members.

A front wheel 14 is supported on the head tube 13 by a steering handle 16 via a front fork 15 so as to be steerable. 17 is a headlamp, 18 is
Is a meter box, and 19 is a wind screen.
A box 20 is mounted on the upper part of the body frame 11, and a seat frame 21 extends rearward below the box 20.
A pivot shaft 22 is provided.

Although not shown, a controller is disposed in the box 20, and a box for storing tools and the like is defined. The controller is connected to an electric motor and a battery, which will be described later, and controls the electric motor. A seat 23 is placed on the seat frame 21,
A front end of a swing arm 24 is swingably supported by the pivot shaft 22. The controller in this embodiment controls the electric motor to operate with high efficiency. The control is described in detail in Japanese Patent Application No. 1-181496 filed earlier by the present applicant. Therefore, the description is omitted.

The swing arm 24 has a front end rotatably attached to the pivot shaft 22, and supports a rear wheel (drive wheel) 25 at a rear end. Although not shown in FIG. 1, the swing arm 24 has a substantially “ladder-like” shape in plan view,
5 is supported at both ends (refer to the embodiment shown in FIGS. 5 and 6), and the rear wheel 25 is provided with a wrapping transmission (the same structure as 76 shown in the embodiment shown in FIGS. 5 and 6). So see)
It is connected to a power unit to be described later so that power can be transmitted. In addition, as shown in FIGS. 5 and 6 showing an embodiment which will be described later, a driven sprocket 74 is fixed to a hub or the like of a rear wheel 25, and the driven transmission 74 is connected to the driven sprocket 74 and a drive sprocket of a power unit. A chain (endless transmission member) 75 is wound therebetween to transmit power. In FIG. 1, 26 is a cushion unit, 27 is a progressive link mechanism, and 28 is a pillion step.

A power unit 29 is suspended from the lower part of the vehicle body frame 11, and is disposed.
Has a structure in which an electric motor, which is an electric motor disposed at a front portion of the body frame 11, and a transmission disposed at a rear portion thereof are integrated. Below the power unit 29, a battery 30 is mounted by a battery frame 80. These power unit 29 and the battery 3
A cover member 31 that covers the front and lower sides of the “0” is suspended.

The cover member 31 has a substantially L-shape when viewed from the side, and has a front upper end supported by the main frame 12 and a rear lower end supported by the battery frame 80. Cover member 3
A large number of air guide holes 81 are formed on the front face of the power unit 29 so as to face the power unit 29 (... denotes a large number; the same applies hereinafter). The arranged traveling wind hits the power unit 29, particularly the electric motor 34, which is a heat generating portion. Thus, the heat generated by the electric motor 34 disposed in front of the power unit 29 constituting the electric motor unit is effectively cooled by the traveling wind.

The battery frame 80 has a substantially “cage” shape and is suspended below the power unit 29. On the battery frame 80, a plurality of batteries 30 connected in parallel or in series are mounted.
.. Are connected to the controller and the electric motor of the power unit 29. As shown in FIG. 1, the power unit 29 has a housing
It is hung and attached to 1. As shown in FIG. 3, a recess 33a formed on the front right side of the housing 33.
Inside, an electric motor 34 is mounted in a recess 33b on the front left side of the housing 33, a belt type continuously variable transmission 35 is mounted in a recess 33c formed on the rear left side of the housing 33, and a reduction gear mechanism 36 is assembled. The equal electric motor 34, the continuously variable transmission 35, and the reduction gear mechanism 36 are integrally formed to form an electric motor unit.

As apparent from FIG. 1, the power unit 2
9 is a rotating shaft of the electric motor 34 (37 in FIG. 3 described later).
A straight line connecting the output shaft of the reduction gear mechanism 36 (68 in FIG. 3 to be described later) extends substantially parallel to the main frame 12 in a side view, that is, the straight line is attached so as to descend downward. . That is, the power unit 29 has a front part rising forward and a rear part falling backward, and as the power unit 29, the main unit 12, which is arranged so as to incline rearward and downward from the head tube 13, extends along a side view. Are located. Thereby, in a state where the power unit 29 is suspended on the main frame 12, there is no uncomfortable feeling, and the appearance of the motorcycle in a side view is improved.

As shown in FIG. 3, the electric motor 34 includes a rotating shaft 37 which penetrates the bottom of the recess 33a and protrudes into the recess 33b.
A coil 40 constituting a stator is fixedly mounted on a stator member 39 that closes the opening, and a rotating shaft 37 is rotatably supported by the bottom of the recess 33a and the stator member 39.

A drive pulley to be described later is fixedly mounted on the rotating shaft 37 at the left end in the concave portion 33b, a fan 44 is provided near the bottom of the concave portion 33a, and a rotation detecting magnet 41 having a plurality of magnetic poles is fixed at the right end. ing. The fan 44 is positioned to face the through hole 45 formed in the concave portion 33a, rotates integrally with the rotating shaft 37, and blows air from the concave portion 33a toward the concave portion 33b. The magnet 41 is connected to the stator member 39.
And a rotation sensor 43 provided opposite to a magnetically sensitive element 42 such as an MR element provided in the rotation sensor 4.
3 detects the rotation of the rotation shaft 37 and outputs a detection signal to the controller.

On the inner surface of the stator member 39 on the side of the concave portion 33a, a cylindrical portion 39a for holding the coil 40 described above is provided.
A heat sink 39b is formed on the outer surface, and a through hole 39 for ventilating cooling air is provided at substantially the same position as the fin of the heat sink 39b.
c is formed. A plurality of switching elements 46 such as FETs constituting a drive circuit of the electric motor 34 are fixed to the heat sink 39b, and these switching elements 46 are connected to the coil 40 and the controller described above. These switching elements 46... Apply a pulse current having a duty factor according to the PWM signal input from the controller to the coil 40.

Reference numeral 47 denotes a cover for covering a heat sink 39b attached to the outer surface of the stator member 39. The cover 47 has a hole 47a for taking in cooling air. Although detailed description is omitted, this hole 47
From a, the cooling air is taken in by the rotation of the above-described fan 44, flows through the through holes 39c and 45, and cools the electric motor 34 and the continuously variable transmission 35.

The continuously variable transmission 35 has a belt 50 mounted between a drive pulley 48 and a driven pulley 49, and the drive pulley 48 is connected to a rotating shaft 37 of the electric motor 34.
In addition, the driven pulley 49 is connected to the input shaft 5 of the reduction gear mechanism 36.
1 is provided. The drive pulley 48
7 and a movable face 53 supported by the rotating shaft 37 so as to be movable in the axial direction.
The movable face 53 is driven by a governor mechanism 55 having a weight 54 and moves in the axial direction. In the drive pulley 48, the centrifugal weight 54 moves in the radial direction according to the rotation speed of the rotating shaft 37, and the movable face 53 moves in the axial direction to change the winding diameter of the belt 50.

The driven pulley 49 is provided on a sleeve 56 rotatably fitted on the outer periphery of the input shaft 51,
The centrifugal clutch 57 and the second centrifugal clutch 58 are connected to the input shaft 51 via a parallel connection. Driven pulley 4
9 is a fixed face 5 fixed to the right end of the sleeve 56.
9, a movable face 60 supported movably in the axial direction by a sleeve 56, and a fixed face 5
And a spring (not shown) that urges to the 9 side. The movable face 60 moves in the axial direction according to a change in the winding diameter of the drive pulley 58, and the belt winding diameter changes.

The first centrifugal clutch 57 has a clutch outer 62 fixed to the left end of the input shaft 51 and a clutch inner 6.
3 is provided on the clutch outer 64 of the second centrifugal clutch 58, and the clutch outer 6 of the second centrifugal clutch 58 is provided.
4 is connected to the left end of the sleeve 56. The driven pulley 49 wound around and connected to the drive pulley 48 by the belt 50 rotates, and when the rotation speed of the driven pulley 49 reaches a predetermined rotation speed, the clutch inner 63 provided on the clutch outer 64 fixed to the sleeve 56. Is expanded, and the centrifugal clutches 58 and 57 are connected. As a result, the driving force of the drive pulley 48 input to the driven pulley 49 is transmitted to the clutch outer 62, and the driving force is transmitted to the input shaft 51 via the clutch outer 62. The clutch outer 62 is provided with a clutch inner 65 which expands and connects the clutch outer 64 and the clutch outer 62.

As described above, the transmission of power to the input shaft 51 by the drive pulley 48 and the driven pulley 49 wound and connected by the belt 50 as a centrifugal clutch is cut off, and the transmission of power during this period is cut off at a predetermined rotation speed or less. When the number of rotations becomes equal to or more than a predetermined number of rotations, the connection is established.

In the speed reduction mechanism 36, the input shaft 51 is
Penetrates a lid member 66 for closing the opening of
And the bottom of the concave portion 33c so as to be rotatable, and the intermediate shaft 67 and the output shaft 68 are supported by the bottom of the concave portion 33c and the lid member 66. The input shaft 51 has a gear 69
However, large and small gears 70 and 71 are provided on the intermediate shaft 67, and the output shaft 6
A gear 72 is fixed to the gear 8, and the gears 69 and 70 mesh with the gear 71 and the gear 72.

The output shaft 68 protrudes rightward through the housing 33, and a drive sprocket 73 is fixed to a protruding end. As described above, the drive sprocket 73 has a chain mounted between the driven sprockets of the rear wheel 25 and is connected to the rear wheel 25 so as to be able to transmit power. The reduction gear mechanism 36 reduces the output power of the electric motor 34 transmitted through the continuously variable transmission mechanism 35 and transmits the output power to the wrapping electric device 70, that is, the rear wheel 25.

Next, the operation of this embodiment will be described. The drive device for a motorcycle with an electric motor supplies a pulse current having a duty factor corresponding to the operation amount of an accelerator grip to the electric motor 34, and the power output from the electric motor 34 is shifted by a continuously variable transmission 35, and the centrifugal transmission is performed. Clutch 57,5
8 to the input shaft 51 and to the rear wheel 25 via the reduction gear mechanism 36 and the wrapping electric device 76. Here, the continuously variable transmission 35 changes the speed in accordance with the rotation speed of the rotating shaft 37 of the electric motor 34 to operate the electric motor 34 in the maximum efficiency state. Therefore, power saving can be achieved. The configuration and the control for operating the electric motor 34 at the maximum efficiency are described in Japanese Patent Application Laid-Open No. H10-157, which was previously proposed by the present applicant.
181496 and Japanese Utility Model Application No. 2-51139, the description is simplified.

On the other hand, this driving device comprises an electric motor 34,
The continuously variable transmission 35 and the reduction gear mechanism 36 are assembled integrally with the power unit 29, and a straight line connecting the rotation shaft 37 of the electric motor 34 and the output shaft 68 of the reduction gear mechanism 36 It is mounted on the lower part of the body frame 11 so as to be positioned substantially parallel to the side view. Therefore, the larger power unit 29
Also, the layout can be easily performed by effectively utilizing the dead space below the main frame 12 and without occupying a large space. In particular, since the power unit 29 mounts the electric motor 34 at the front of the body frame 11, the drive unit 29
The electric motor 34 can be effectively cooled by applying the traveling wind to the motor 4.

Also, in this motorcycle with a motor,
A heavy power unit 29 is arranged at the lower front part of the vehicle body frame 11, and a similar heavy battery 30 is arranged below the power unit 29. Therefore, mass concentration and lowering of the center of gravity can be achieved, and high running stability can be obtained.

FIGS. 4 and 5 show another embodiment of the drive device for a motorcycle with a motor according to the present invention.
FIG. 5 is a side view of the motorcycle, and FIG. 5 is a cross-sectional plan view of a main part. In the description of this embodiment and other embodiments to be described later, the same portions as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, in this embodiment,
The power unit 29 is composed of the electric motor 34 and the continuously variable transmission 35. In the power unit 29, the pivot shaft 22 rotatably penetrates the rear portion of the housing 33, the rear portion of the housing 33 is supported by the pivot shaft 22, and the output shaft 68 is rotatably fitted to the outer periphery of the pivot shaft 22. It consists of a cylindrical member coaxial with the pivot shaft 22.

The output shaft 68 has a right end protruding rightward of the housing 33. The output shaft 68 is provided with a driven pulley 49 of the continuously variable transmission 35 in the housing 33 via a sleeve 56. At the protruding right end,
The drive sprocket 73 is fixed. As in the above-described embodiment, the driven pulley 49 is connected to the output shaft 68 via the first centrifugal clutch 57 and the second centrifugal clutch 58.

Also in this embodiment, the power unit 29 is configured such that the electric motor 34 is positioned forward, and the straight line connecting the rotation shaft 37 and the output shaft 68 of the electric motor 34 is substantially horizontal when viewed from the side, that is, the main frame 12. And the power unit 29 and the battery 3
0 is disposed below the body frame 11. Therefore, as described above, the layout of the power unit 29 is easy, the electric motor 34 can be effectively cooled, and the mass can be concentrated and the center of gravity can be reduced.

In this embodiment, a drive sprocket 73 is attached to an output shaft 68 coaxial with the pivot shaft 22.
Is fixed, and a chain 75 is mounted between the drive sprocket 73 and the driven sprocket 74 of the rear wheel 25. Therefore, even if the rear wheel 25 bounces or rebounds, the distance between the drive sprocket 73 and the driven sprocket 74 does not change, and the tension of the chain 75 can be prevented from fluctuating.

FIG. 6 is a cross-sectional plan view similar to FIG. 5, showing still another embodiment of the present invention. In this embodiment, the pivot shaft 22 is constituted by two shafts 22a and 22b, and the output shaft 68 of the power unit 29 is arranged between these shafts 22a and 22b. The pivot shaft 22 is a shaft 2
2a, 22b are arranged coaxially, and these shafts 22a, 2b
2b supports the left and right front portions of the swing arm 24 on the main frame 12. The power unit 29 has an output shaft 68
Between the shafts 22a and 22b of the pivot shaft 22,
A drive sprocket 73 is fixedly mounted on the right end of the output shaft 68 protruding from the housing 33, supported by the housing 33 coaxially with the 2a and 22b.

In this embodiment, similarly to the above-described embodiment, the layout is easy, and the electric motor 34 can be cooled effectively by the traveling wind.
Concentration of mass in the vehicle body and lowering the center of gravity can be achieved.
The fluctuation of the tension of the chain 75 at the time of the bounce and the rebound can also be prevented.

[0035]

According to the present invention, the following effects are exhibited by the above configuration. A motorcycle according to claim 1, further comprising a motor unit including a motor unit suspended from a head tube supporting a front wheel and extending downward and rearward at a substantially central portion of the front and rear wheels, wherein the motor unit includes a motor. When,
An output shaft for outputting the rotation of the motor is provided, and a sprocket is provided at an end of the output shaft, and a rear wheel is driven through a chain that meshes with the sprocket.The motor unit is integrally provided with a control circuit for controlling the rotation of the motor. In addition, the electric motor is arranged at the front of the electric motor unit, the rotating shaft of the electric motor is provided substantially horizontally, and the shape of the electric motor unit in a side view is along the main frame.

According to the first aspect of the present invention, the control circuit for controlling the rotation of the motor is provided integrally with the motor unit, so that the mass can be concentrated, the outer shape of the motor unit can be made compact, and the center of gravity can be reduced. Since the motor unit is suspended on the main frame and the motor is exhausted at the front of the frame, the traveling wind easily hits the motor as a heat source, and the motor is effectively cooled. In addition, since the motor unit is arranged along the main frame, it is possible to improve the appearance of the motorcycle, which is an important element in appearance, and by arranging the motor unit along the main frame, the frame and the motor are arranged. There is little possibility that foreign matter or the like from the front wheel enters between the units.

[Brief description of the drawings]

FIG. 1 is an overall side view of a two-wheeled vehicle with an electric motor related to book filling.

FIG. 2 is an enlarged side view of a main part.

FIG. 3 is an enlarged plan view of a main part.

FIG. 4 is a side view showing another embodiment of the drive device for a motorcycle with an electric motor according to the present invention.

FIG. 5 is a cross-sectional plan view of a main part of FIG. 4;

FIG. 6 is a cross-sectional plan view similar to FIG. 5, showing still another embodiment of the present invention.

[Explanation of symbols]

1 ... two-wheeled vehicle, 14 ... front wheel, 12 ... main frame,
13: head tube, 25: rear wheel, 29: electric motor unit, 34: electric motor, 68: output shaft, 73
... sprockets, 74 ... chains.

Claims (1)

[Claims] 1. A motorcycle including a motor unit having a motor unit suspended on a main frame extending rearward and downward from a head tube supporting a front wheel at a substantially central portion of front and rear wheels, wherein the motor unit includes: An electric motor, and an output shaft for outputting the rotation of the electric motor; a sprocket at the end of the output shaft; and a rear wheel driven via a chain that meshes with the sprocket. A circuit is provided integrally, a motor is disposed at the front of the motor unit, a rotation axis of the motor is provided substantially horizontally, and a side view shape of the motor unit is made to follow the main frame. A drive device for a two-wheeled vehicle with a motor.