JP2013184628A - Electric motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motorcycle configured to increase load capacity for a battery.SOLUTION: An electric motorcycle includes: a pivot shaft 24 disposed between right and left pivot frames 23L, 23R; a swing arm 51 having a front end swingably supported by the pivot shaft 24; an electric motor unit 15 to be attached to the swing arm 51; and a battery 16 to be attached to the main frame to drive the electric motor unit 15. A drive sprocket 78 arranged behind the pivot shaft 24 to drive a rear wheel 12 is attached to the electric motor unit 15. A drive chain 80 is stretched between the drive sprocket 78 and a driven sprocket 79 attached to the rear wheel 12.

Description

  The present invention relates to an improvement in an electric motorcycle.

  2. Description of the Related Art An electric motorcycle that travels using an electric motor unit as a drive source is known (see, for example, Patent Document 1 (FIG. 4)).

  As shown in FIG. 4 of Patent Document 1, in an electric motorcycle, a pair of left and right mainframes (52) from the head pipe (51) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter). ) Is extended. A battery (74, 75) is disposed below the pair of left and right main frames (52), and an electric motor unit (15) is disposed below the battery (74, 75).

In the electric motorcycle of Patent Document 1, since the electric motor unit (15) is disposed below the battery (74, 75), the load capacity of the battery (74, 75) is limited.
A technique capable of increasing the load capacity of the batteries (74, 75) is preferable because the cruising distance of the vehicle can be increased.

Japanese Patent No. 3949446

  It is an object of the present invention to provide an electric motorcycle that can increase the load capacity of a battery.

  According to the first aspect of the present invention, a pair of left and right main frames extending downward from the head pipe from the head pipe, left and right pivot frames extending downward from the pair of left and right main frames, and the left and right pivot frames are passed. Pivot shaft, a swing arm whose front end is swingably supported on the pivot shaft and a rear wheel is rotatably supported on the rear end, an electric motor unit attached to the swing arm and driving the rear wheel, a main frame, In an electric motorcycle equipped with a battery that is attached to the left and right pivot frames and supplies electric power to the electric motor unit, the electric motor unit is provided with a drive sprocket that is disposed behind the pivot shaft and drives the rear wheel, Between this drive sprocket and the driven sprocket attached to the rear wheel, Characterized in that the drive chain for moving is stretched.

  The invention according to claim 2 is characterized in that the electric motorcycle is provided with a rear cushion unit that absorbs a shock applied to the swing arm, and a drive sprocket is arranged in parallel on the side of the rear cushion unit in the vehicle width direction. To do.

  The invention according to claim 3 is characterized in that the motor shaft of the electric motor unit and the sprocket shaft of the sprocket are different from each other, and the motor shaft is arranged in front of the vehicle of the sprocket shaft.

  The invention according to claim 4 is characterized in that a storage portion for storing objects is provided above the battery and the electric motor unit.

  According to a fifth aspect of the present invention, a battery is disposed below the main frame and in front of the pivot shaft, and a cover that covers the battery is provided on the left and right sides of the battery in the vehicle width direction. And auxiliary equipment is arranged.

In the invention according to claim 1, the electric motor unit is attached to the swing arm located behind the main frame.
Conventionally, when the electric motor unit and the battery are disposed below the main frame, the load capacity of the battery is reduced by the amount corresponding to the electric motor.

  In this regard, in the present invention, the electric motor unit is attached to the swing arm, and the drive sprocket of the electric motor unit is attached behind the pivot shaft. That is, since at least a part of the electric motor unit is disposed behind the main frame, the load capacity of the battery can be increased.

  In the invention according to claim 2, the rear cushion unit and the drive sprocket are arranged in parallel in the vehicle width direction. If the rear cushion unit can be arranged in parallel with the drive sprocket, there is no fear that the degree of freedom of arrangement of the rear cushion is impaired even when the electric motor unit is moved rearward of the vehicle.

  In the invention which concerns on Claim 3, the motor shaft is arrange | positioned ahead of the vehicle of the sprocket shaft. Since the motor shaft, in which elements that are more likely to be heavier than the sprocket shaft due to magnets or the like are arranged in the vicinity, is arranged close to the pivot shaft close to the center of gravity of the vehicle, the vehicle mass can be concentrated.

  In the invention which concerns on Claim 4, the accommodating part was provided using the space which becomes easy to become a dead space above a battery and an electric motor unit. With this storage portion, a sufficient storage space can be secured.

  In the invention which concerns on Claim 5, auxiliary machinery is arrange | positioned between a battery and a cover. By covering the auxiliaries with the battery and the cover, the auxiliaries can be protected.

1 is a left side view of an electric motorcycle according to the present invention. It is a principal part enlarged view of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a top view explaining an electric motor unit and its peripheral part. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is a perspective view explaining the battery arrangement state of an electric motorcycle. It is another Example figure of FIG.

  Hereinafter, embodiments of the present invention will be described in detail. In the drawings and examples, “up”, “down”, “front”, “rear”, “left”, and “right” respectively indicate directions viewed from the driver who rides the electric motorcycle.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the electric motorcycle 10 is provided at a vehicle body frame 20, a front wheel steering portion 13 provided at a front end of the vehicle body frame 20 to support a front wheel 11, and a rear portion of the vehicle body frame 20. A rear wheel suspension portion 14 for swingably supporting the rear wheel 12, an electric motor unit 15 that is disposed between the front wheel 11 and the rear wheel 12, and drives the rear wheel 12, and a battery 16 that supplies power to the electric motor unit 15. This is a saddle-ride type vehicle having a seat 18 that is placed on the body frame 20 between the front wheels 11 and the rear wheels 12 and on which the occupant sits.

  The front wheel steering unit 13 includes a steering shaft 30 that is rotatably provided on a head pipe 21 positioned at the front end of the vehicle body frame 20, and a top bridge that is attached so that the head pipe 21 is sandwiched between the upper end and the lower end of the steering shaft 30. 31 and a bottom bridge 32, a front fork 33 that is supported by the top bridge 31 and the bottom bridge 32, extends obliquely forward and downward in the vehicle, and rotatably supports the front wheel 11 at a lower end thereof, and is attached to an upper end of the top bridge 31. It consists of a handle 34 on which the occupant performs a steering operation.

  A front fender 41 is attached to the front fork 33 above the front wheel 11 and covers the upper side of the front wheel 11 and prevents mud splashed by the front wheel 11. A rear fender 42 is attached to seat rails 25L and 25R (only reference numeral 25L on the front side in the figure) constituting the vehicle body frame 20 so as to cover the rear wheel 12 from the front to the rear and prevent mud splashed by the rear wheel 12. .

  The rear wheel suspension portion 14 is supported by a pivot shaft 24 passed to pivot frames 23L and 23R (only reference numeral 23L on the front side of the figure) of the vehicle body frame 20 so that the front end can swing freely, and the rear wheel 12 is attached to the rear end. A swing arm 51 that is rotatably supported, a rear cushion unit 52 that is interposed between the swing arm 51 and the vehicle body frame 20 and absorbs a shock applied to the swing arm 51, a lower end of the rear cushion unit 52, and the swing arm 51 The link mechanism 53 that connects the two is the main element.

  As shown in FIGS. 2 and 3, the link mechanism 53 includes a pair of left and right link plates 64 </ b> L and 64 </ b> R that are rotatably attached to the lower end of the rear cushion unit 52 via a first link shaft 61, and these link plates. A second link shaft 62 which is passed to the front ends of 64L and 64R and is pivotally attached to stays 72 and 72 on the pivot frames 23L and 23R side, and is passed to the rear ends of the left and right link plates 64L and 64R to the swing arm 51 side. The third link shaft 63 is rotatably attached to the stays 73, 73 (only the reference numeral 73 on the front side of the drawing is shown).

  The body frame 20 of the electric motorcycle includes a head pipe 21, a pair of left and right main frames 22L and 22R extending downward from the head pipe 21 and a left and right pivot extending downward from the pair of left and right main frames 22L and 22R. Frames 23L, 23R, a pivot shaft 24 passed between these left and right pivot frames 23L, 23R, a cross rail 26 passed between a pair of left and right main frames 22L, 22R, and left and right main frames 22L, 22R The left and right seat rails 25L and 25R each extending rearward from the front of the vehicle and the seat 18 being placed thereon, and the rear portions of the left and right seat rails 25L and 25R extending obliquely upward from the rear of the left and right main frames 22L and 22R The left and right first support members 27L, 27R that support each (reference number 2 on the front side in the figure) L is shown), and the left and right first support members 27L, 27R extend from the left and right pivot frames 23L, 23R to the middle part of the left and right seat rails 25L, 25R and are respectively connected to the middle part of the left and right seat rails 25L, 25R. Left and right second support members 28L, 28R (only the reference numeral 28L on the front side is shown).

  A cushion stay 29 extends rearward from the cross rail 26, and the upper end of the rear cushion unit 52 is attached to the cushion stay 29. Down stays 35L and 35R (only the reference numeral 35L on the front side of the figure is shown) that supports the battery 16 extends obliquely rearward and downward from the front portions of the main frames 22L and 22R.

  The electric motor unit 15 that drives the rear wheel 12 is arranged so that a part thereof overlaps the pivot frames 23L and 23R in a side view of the vehicle. The battery 16 that supplies power to the electric motor unit 15 is attached to the main frames 22L and 22R via a plurality of battery storage portions 43 that are formed in a rectangular cross section in a vehicle side view. The mounting arrangement structure of the electric motor unit 15 and the battery 16 will be described later.

  Above the battery 16 and the electric motor unit 15, a storage unit 44 is provided for storing objects. The storage portion 44 is disposed in a region surrounded by the main frames 22L and 22R, the seat rails 25L and 25R, and the first support members 27L and 27R in a side view of the vehicle. The storage portion 44 is provided using a region (space) that tends to be a dead space above the battery 16 and the electric motor unit 15. The storage portion 44 ensures a sufficient storage space.

  Further, a PDU unit 83 as a power drive unit (Power Drive Unit) connected to the input side of the electric motor unit 15 is disposed between the storage unit 44 and the battery 16 and between the left and right main frames 22L and 22R. Is done.

Next, the structure of the electric motor unit and its peripheral part will be described.
As shown in FIG. 4, an electric motor unit 15 that drives the rear wheel 12 is disposed behind the pivot shaft 24 in the vehicle. The electric motor unit 15 is attached to the swing arm 51. The electric motor unit 15 includes a motor main body 75 in which the motor shaft 66 extends in the vehicle width direction, and a speed reduction unit 76 that extends from one end of the motor main body 75 in the vehicle width direction to the rear of the vehicle to reduce the rotational speed of the motor shaft 66. It has an L shape in a vehicle plan view. The speed reduction portion 76 extends rearward of the vehicle at a lateral position in the vehicle width direction of the rear cushion unit 52, and a drive sprocket 78 is attached to the output shaft 68 of the speed reduction portion.

  According to such a configuration, even if the fastening member that stops the rear cushion unit 52 is removed, the rear cushion unit 52 is caught by the speed reduction unit 76 or the motor main body 75, and the rear cushion unit 52 is difficult to be removed. it can. A spring 54 is inserted into the outer periphery of the rear cushion unit 52.

  The speed reduction part 76 is disposed close to the left side of the swing arm 51 on one side in the vehicle width direction. A drive sprocket 78 attached to the output shaft 68 of the speed reducing unit 76 is disposed behind the pivot shaft 24. The drive sprocket 78 is arranged in parallel on the side of the rear cushion unit 52 in the vehicle width direction. A drive chain 80 for driving is spanned between the drive sprocket 78 and a driven sprocket 79 attached to the rear wheel 12. Since the drive sprocket 78 is disposed behind the pivot shaft 24, the drive chain 80 spanned between the drive sprocket 78 and the driven sprocket 79 is also disposed behind the pivot shaft 24. A chain cover 84 that covers the drive chain 80 is attached to the swing arm 51.

  A plurality of heat dissipating fins 85 extend radially in the vehicle width direction outside the motor body 75. Since the rear fender 42 is disposed behind the fins 85 and in front of the rear wheels 12, foreign matters such as mud splashed on the rear wheels 12 can be prevented from adhering to the fins 85, and a predetermined cooling effect can be maintained. Can do.

  In FIG. 2, the chain cover 84 covers a part of the drive sprocket 78, the driven sprocket 79 and the drive chain 80. For this reason, compared with a chain cover that covers all of the drive sprocket 78, the driven sprocket 79, and the drive chain 80, it is possible to suppress an increase in the weight of the vehicle while reducing the adhesion of foreign matter to the drive system.

  As shown in FIG. 5, the speed reduction portion 76, which is a component of the electric motor unit 15, includes a case portion 86, a pinion gear 65 attached to a motor shaft 66 extending to the case portion 86, and an idle shaft 67 that meshes with the pinion gear 65. And a final gear 69 that meshes with the idle gear 77 and is attached to the output shaft 68 (sprocket shaft 68). The driving force of the motor input to the pinion gear 65 is transmitted to the sprocket shaft 68 via the idle gear 77 and the final gear 69.

  Referring also to FIG. 4, a drive sprocket 78 is attached to the sprocket shaft 68, and a drive chain 80 is stretched between the drive sprocket 78 and the driven sprocket 79 of the rear wheel. In this case, the pitch circle diameter of each gear is increased in the order of the pinion gear 65, the idle gear 77, and the final gear 69. Furthermore, since the pitch circle diameter of the driven sprocket 79 is made larger than that of the drive sprocket 78, the normal rotational speed of the electric motor unit 15 can be increased. The output of the motor can be increased by an amount corresponding to the increase in the normal rotation speed. The motor main body 75 of the electric motor unit 15 can be reduced in size by the increase in output. Here, the motor shaft 66 of the electric motor unit and the sprocket shaft 68 of the sprocket are different shafts, and the motor shaft 66 is disposed in front of the sprocket shaft 68 in the vehicle.

  Since the electric motor unit 15 configured in an L shape with the speed reduction unit 76 and the motor main body 75 is arranged according to the shape of the swing arm 51, the electric motor unit 15 can be efficiently arranged in a limited space. it can.

  In FIG. 3, the speed reduction unit 76 of the electric motor unit 15 is attached to the left swing arm 51 </ b> L of the swing arm 51. A plate-like unit support stay 90 is fixed to the left swing arm 51L, and the speed reduction portion 76 of the electric motor unit 15 is attached to the unit support stay 90. The unit support stay 90 includes a first horizontal portion 91, a first vertical portion 101 extending upward from the end portion of the first horizontal portion 91, and a second horizontal portion extending upward from the end portion of the first vertical portion 101. 92 is a plate-like bracket composed of a second vertical portion 102 extending upward from an end portion of the second horizontal portion 92. The first horizontal portion 91 and the first vertical portion 101 are in contact with and secured to the bottom surface 51b and the inner surface 51i of the left swing arm 51, respectively. Further, the speed reduction portion 76 of the electric motor unit 15 is attached to the second vertical portion 102 of the unit support stay 90.

  As shown in FIG. 6, a battery storage portion 43 in which the battery 16 is stored is attached to the main frames 22L and 22R. The battery storage unit 43 is disposed below the main frames 22L and 22R. The battery 16 and the battery storage portion 43 are covered with covers 81L and 81R on the left and right sides in the vehicle width direction. The left and right covers 81L and 81R have upper ends attached to the left and right seat rails 25L and 25R, respectively, and height intermediate portions are attached to the left and right main frames 22L and 22R via the left and right stays 105 and 106, respectively. Are attached to the battery storage unit 43.

  Auxiliary machines 103 and 104 are arranged outside the battery 16 inside the left and right covers 81L and 81R in the vehicle width direction. The auxiliary machines 103 and 104 can be protected by covering the auxiliary machines 103 and 104 with the battery 16 and the left and right covers 81L and 81R.

  In the present embodiment, the batteries are attached to the main frames 22L and 22R via the battery storage part, but the batteries are attached to the left and right pivot frames 23L and 23R via the battery storage part. The battery can be attached to the main frame and the left and right pivot frames via the battery storage unit.

  In this embodiment, the battery housing is made of metal and welded to the main frame. However, the battery housing may be made of resin and attached to the left and right main frames with a fastening member such as a screw member.

  FIG. 7 shows the battery 16 stored in each storage chamber of the battery storage unit. One battery 16 includes, for example, ten battery cells 17. Such batteries 16 can be stored in three stages in the height direction, and can be stored in six rows in the substantially longitudinal direction. That is, according to the electric motorcycle of the present invention, 18 batteries 16 can be mounted. The longitudinal axis 17J of each battery cell 17 coincides with the longitudinal direction of the vehicle, and as shown in FIG. 6, the battery 16 is disposed at the center in the vehicle width direction. Therefore, the weight balance in the vehicle width direction is good.

The operation of the electric motorcycle described above will be described next.
In FIG. 4, the electric motor unit 15 is attached to a swing arm 51 located behind the main frames 22L and 22R.
Conventionally, when the electric motor unit and the battery are disposed below the main frame, the load capacity of the battery is reduced by the amount corresponding to the electric motor.

  In this regard, in the present invention, the electric motor unit 15 is attached to the swing arm 51, and the drive sprocket 78 of the electric motor unit 15 is attached to the rear of the pivot shaft 24. That is, since at least a part of the electric motor unit 15 is disposed behind the main frames 22L and 22R, the loading capacity of the battery 16 can be increased.

  The rear cushion unit 52 and the drive sprocket 78 are arranged in parallel in the vehicle width direction. If the rear cushion unit 52 can be arranged in parallel with the drive sprocket 78, there is no fear that the degree of freedom of arrangement of the rear cushion is impaired even when the electric motor unit 15 is moved rearward of the vehicle.

  The motor shaft 66 is disposed in front of the vehicle with respect to the sprocket shaft 68. Since the motor shaft 66, in which elements that are more likely to be heavier than the sprocket shaft 68 are disposed by magnets or the like, is disposed close to the pivot shaft 24 near the center of gravity of the vehicle, the vehicle mass can be concentrated.

Next, a modified example related to the mounting of the electric motor unit will be described.
As shown in FIG. 8, the speed reduction unit 76 of the electric motor unit 15 is supported by a unit support stay 90. The unit support stay 90 is an L-shaped member including a horizontal portion 96 and a vertical portion 97 extending upward from an end portion of the horizontal portion. The lower surface 96b of the horizontal portion 96 is brought into contact with and secured to the upper surface 51u of the left swing arm 51. Further, the speed reduction portion 76 of the electric motor unit 15 is attached to the vertical portion 97 of the unit support stay 90. Other structures and operations are not significantly different from those of the embodiment and description thereof is omitted.

  Although the present invention is applied to an electric motorcycle in the embodiment, it can also be applied to an electric tricycle and can be applied to a general electric motorcycle.

  The present invention is suitable for an electric motorcycle.

  DESCRIPTION OF SYMBOLS 10 ... Electric motorcycle, 12 ... Rear wheel, 15 ... Electric motor unit, 16 ... Battery, 21 ... Head pipe, 22L, 22R ... Left and right main frame, 23L, 23R ... Left and right pivot frame, 24 ... Pivot shaft, 44 ... Storage part 51 ... Swing arm 52 ... Rear cushion unit 66 66 Motor shaft of electric motor unit 68 68 Sprocket shaft of drive sprocket 78 Drive sprocket 79 79 Driven sprocket 80 Drive chain 81L 81R Cover, 103 ... auxiliaries, 104 ... auxiliaries.

Claims (5)

A pair of left and right main frames (22L, 22R) extending downward from the head pipe (21) and the left and right pivot frames (23L, 23R) extending downward from the pair of left and right main frames (22L, 22R); A pivot shaft (24) passed between the left and right pivot frames (23L, 23R), a front end swingably supported by the pivot shaft (24), and a rear wheel (12) rotatable at the rear end. A swing arm (51) to be supported, an electric motor unit (15) attached to the swing arm (51) and driving the rear wheel (12), the main frame (22L, 22R) and / or the left and right pivots A battery (16) attached to the frame (23L, 23R) and supplying power to the electric motor unit (15). In the two-wheeled vehicle,
A drive sprocket (78) that is disposed behind the pivot shaft (24) and drives the rear wheel (12) is attached to the electric motor unit (15),
An electric motorcycle characterized in that a drive chain (80) for driving is suspended between the drive sprocket (78) and a driven sprocket (79) attached to the rear wheel (12). The electric motorcycle includes a rear cushion unit (52) that absorbs a shock applied to the swing arm (51),
The electric motorcycle according to claim 1, wherein the drive sprocket (78) is arranged in parallel to the side of the rear cushion unit (52) in the vehicle width direction.   The motor shaft (66) of the electric motor unit (15) and the sprocket shaft (68) of the drive sprocket (78) are different from each other, and the motor shaft (66) is located in front of the sprocket shaft (68) in the vehicle. The electric motorcycle according to claim 1, wherein the electric motorcycle is disposed in the vehicle.   The electric motorcycle according to any one of claims 1 to 3, further comprising a storage portion (44) for storing objects above the battery (16) and the electric motor unit (15).   The battery (16) is disposed below the main frame (22L, 22R) and in front of the pivot shaft (24), and the battery (16) is disposed on the left and right sides of the battery (16) in the vehicle width direction. A cover (81L, 81R) is provided, and auxiliary equipment (103, 104) is disposed inside the cover (81L, 81R) in the vehicle width direction. The electric motorcycle according to any one of the preceding claims.

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