JP3690417B2 - Motorcycle with electric motor - Google Patents

Description

  The present invention relates to an electric motor-equipped motorcycle that employs an electric motor as a drive source of a power unit.

  The scooter type motorcycle conventionally employs an internal combustion engine that uses gasoline as fuel and burns it to convert it into power, and the vehicle is driven by the power.

  However, in an internal combustion engine using gasoline as fuel, measures against vibration and noise are indispensable, and measures against cooling of the internal combustion engine and heat of exhaust gas must be taken. In addition, since exhaust gas is discharged, there is a problem of air pollution, and countermeasures are difficult. Furthermore, there are various problems such as requiring various types of devices such as carburetors, air cleaners, and mufflers as incidental devices.

  Therefore, if an electric motor is used as a non-polluting power source, and the electric vehicle is driven by driving the rear wheels with this motor, no pollution problems occur, and there are few auxiliary devices, but the scooter type motorcycle is very preferable. Since it is a power unit type that supports the rear wheel in a swingable manner, an electric type has not yet been provided.

  By the way, when an electric motor is mounted as a drive source (power source) in a power unit of a scooter type motorcycle, if it is desired to use a plurality of electric motors at the same time in order to increase output, the power transmission mechanism housed in the power unit A plurality of electric motors are installed in the vicinity of the drive shaft. However, it is difficult to install a plurality of electric motors in a scooter type motorcycle having no space.

  In addition, since the electric motor is heavy, if a plurality of electric motors are installed in the power unit, the unsprung weight of the rear wheels becomes heavy, which may adversely affect riding comfort and handling stability.

  The present invention has been made in consideration of the above-described circumstances, and enables the installation of a plurality of electric motors in the power unit by effectively utilizing the dead space inside the vehicle body, and also improves ride comfort and driving stability. An object of the present invention is to provide a motorcycle with an electric motor that can achieve the above.

  In order to achieve the above object, a two-wheeled vehicle with an electric motor according to the present invention includes a handle at the front part of the body frame, and a power transmission mechanism that transmits the driving force of the electric motor to the rear wheel below the seat and behind the front wheel. An electric motor-equipped motorcycle that suspends a power unit provided, wherein a plurality of the electric motors are installed on the outer periphery of the power unit, and the motor shaft of the electric motor and the drive shaft of the power transmission mechanism are separated from each other. The driving force of the shaft is transmitted to the drive shaft by a plurality of gears, and the meshing positions of the plurality of gears are substantially on the center line of the vehicle body in plan view.

  If configured as described above, it is possible to install a plurality of electric motors in the power unit by effectively using the dead space inside the vehicle body, to make the power unit compact and improve the ride comfort, and to balance the left and right weight of the power unit. This improves the handling stability.

  Embodiments and reference examples of the present invention will be described below with reference to the drawings.

  FIG. 2 is a right side view showing a reference example of the two-wheeled vehicle with an electric motor according to the present invention, and FIG. 1 is a cross-sectional view taken along the line II of FIG.

  As shown in FIG. 2, the two-wheeled vehicle with the electric motor is of a scooter type, a steering shaft (not shown) of the front wheel 2 is supported on the front part of the body frame 1, and a handle 3 is attached to the upper end thereof. A seat 4 is provided above the rear portion of 1, and an article storage chamber 6 for storing luggage such as a helmet 5 by opening and closing the seat 4 is provided below the seat 4.

  A power unit 8 is pivotally supported on a suspension bracket 7 at the rear of the vehicle body frame 1 through a mounting bracket 9 integrally formed with the power unit 8 so as to be swingable in the vertical direction. A rear wheel 10 is pivotally supported at the rear portion of the power unit 8, and the upper portion of the power unit 8 is buffered and suspended on the vehicle body frame 1 using a cushion unit 11. The mount bracket 9 may be integrated at the 9 ′ position in the upper front portion of the power unit 8.

  As shown in FIG. 1, the power unit 8 is obtained by integrating a V-belt transmission mechanism 12 as a power transmission mechanism and an electric motor 13 as a drive source. It is configured to be surrounded by a case cover (clutch cover) 15. The power unit case 14 is configured by joining the unit case L-side element 14 </ b> A and the unit case R-side element 14 </ b> B at the position of the power unit center line O of the power unit 8.

  The electric motor 13 is fixed to the unit case R-side element 14B installed on the drive side of the power unit case 14 using mounting bolts 16 and the like, as shown in FIGS. In addition, the charging generator 17 is disposed in front of the unit case R side element 14B. That is, the relatively large electric motor 13 is installed at the drive side center of the power unit case 14, and the generator 17 smaller than the electric motor 13 is installed at the drive side front end of the power unit case 14. The generator 17 is fixed to the unit case R side element 14 </ b> B by mounting bolts 18, and is fixed to the generator support boss 19 fixed to the electric motor 13 by using mounting bolts 20.

  The motor shaft 21 of the electric motor 13 is integrally formed coaxially with the drive shaft 22 of the V-belt transmission mechanism 12, and a generator drive sprocket 24 is formed at a position corresponding to the power unit center line O on the integrated shaft 23. The integral shaft 23 is rotatably supported by the unit case L side element 14A via bearings 25 and 26 and the unit case R side element 14B via a bearing 27, respectively.

  The V-belt speed change mechanism 12 includes a drive V pulley 28 mounted on the drive shaft 22, a driven V pulley 29 that faces the drive V pulley 28, and a V belt 30 that spans between the V pulleys 28 and 29. And comprising. A fan 32 that cools the belt chamber 31 is provided outside the drive V pulley 28.

  The driven V pulley 29 of the V-belt transmission mechanism 12 is rotatably supported by a mission drive shaft 33 provided behind the unit case L-side element 14A, and is connected to the mission drive shaft 33 via a centrifugal clutch mechanism 34. Is done. The mission drive shaft 33 is rotatably supported by the unit case L side element 14A and the mission cover 35 via a bearing 36, and is connected to a rear axle 39 via a reduction gear mechanism 38 disposed in the mission chamber 37. Is done.

  Therefore, the rotational force of the electric motor 13 is transmitted from the integral shaft 23 integrated with the motor shaft 21 and the drive shaft 22 to the drive V pulley 28 of the V belt transmission mechanism 12, and is transmitted to the driven V pulley 29 via the V belt 30. The transmission is transmitted to the rear axle 39 via the centrifugal clutch mechanism 34, the mission drive shaft 33, and the reduction gear mechanism 38, and the rear wheel 10 is rotationally driven.

  On the other hand, a generator shaft 40 of the generator 17 is provided on a separate axis from the integrated shaft 23 and is fitted to a generator driven shaft 41 as shown in FIG. A generator driven sprocket 42 is formed on the generator driven shaft 41, and a generator drive chain 43 is bridged between the generator driven sprocket 42 and the generator drive shaft 24 of the integral shaft 23. Accordingly, a part of the rotational force of the electric motor 13 is transmitted to the generator 17 via the generator drive sprocket 24, the generator drive chain 43 and the generator driven sprocket 42, and the generator 17 generates power.

  2 and 3 indicates a battery. The battery 44 is provided in a space formed between the front lower portion of the article storage chamber 6 and the suspension bracket 7, a space above the rear wheel 10 behind the article storage chamber 6, and a space below the step board 45. Be placed.

  According to the above configuration, since the motor shaft 25 and the drive shaft 22 of the power transmission mechanism 12 are coaxially and integrally configured by the integrated shaft 23, output loss can be reduced.

  Further, in this configuration, since the motor shaft 21 is coaxially integrated with the drive shaft 22 and the generator shaft 40 is configured on a separate axis from the drive shaft 22, the large electric motor 13 is moved closer to the center of the unit case R side element 14B. In addition, small generators 17 can be installed on the periphery of the unit case R-side element 14B. As described above, since the large electric motor 13 is arranged not in the peripheral portion of the unit R side element 14B but in the center, the power unit 8 can be made compact.

  Further, since the electric motor 13 is installed in the unit case R side element 14B of the power unit case 14, the shaft length of the integral shaft 23 is extended, and the integral shaft 23 can be supported by a large number of bearings 25, 26 and 27. As a result, the electric motor 13 can be enlarged.

  Furthermore, the generator 17 is supported by the unit case R-side element 14B using the mounting bolts 18 and is also supported by the electric motor 13 using the generator support boss 19 and the mounting bolts 20. Compared with the case where only the R-side element 14B is supported, the reinforcing structure of the unit case R-side element 14B can be simplified and the design can be facilitated.

  FIG. 5 is a schematic horizontal sectional view showing a power unit in a first modification of the reference example. 6 is a left side view showing a two-wheeled vehicle with an electric motor equipped with the power unit of FIG. 5, and FIG. 7 is a plan view of the electric motor of FIG. In the first modification of the first embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the power unit 46 according to the first modification of the first embodiment, the power unit case 47 includes a unit case L-side element 47A and a unit case R-side element 47B, and the V-belt transmission mechanism 12 is replaced with the unit case R-side element 47B. The fixing bolt 16 is used for fixing. Further, the generator 17 is fixed to the unit case L side element 47A using the mounting bolt 18 and is fixed to the generator support boss 48 formed on the unit case L side element 47A using the mounting bolt 20. The generator shaft 40 of the generator 17 is rotatably supported by the unit case L side element 47A.

  In the first modification of this reference example, the generator 17 is disposed at a position opposite to the electric motor 13, so that the weight balance in the left-right direction of the power unit 46 is improved, and the dead space of the power unit 46 can also be used effectively. .

  Further, since the generator 17 is supported not only at the position on the generator shaft 40 side but also at the position near the case cover 15 in the power unit case L side element 47A, the generator 17 can be supported by a structure that supports both ends. The reinforcing structure of the case L side element 47A can be simplified.

  In the first modification of this reference example, the generator 17 is installed at the front edge of the power unit 46 as shown in FIGS. 6 and 7, but the front portion of the power unit 46 is shown in FIG. You may install in the upper part or the lower part of.

  Further, like the two-wheeled vehicle with the electric motor in the second modification of the reference example shown in FIG. 8 and FIG. 9, an article storage chamber 6 for storing a full-face type or semi-jet type helmet 5 in an inverted state is provided. Even if the generator 17 is provided with the article storage chamber 6 for storing the helmet 5 in a laid-down state, such as a motorcycle with an electric motor in the third modification of the reference example shown in FIGS. Similarly to the first modified example of the reference example, the power unit 46 is installed at either the front end position of the front portion, the front portion upper position of the power unit 46 or the front portion lower position of the power unit 46.

  In the power unit of the two-wheeled motor vehicle according to the fourth modification of the reference example of the present invention, the generator support boss 48 according to the first modification of the reference example is integrated with or integrated with the case cover 15 as shown by a one-dot chain line in FIG. Provided. Therefore, in the fourth modification of the first embodiment, the generator 17 is also supported by the case cover 15, so that the reinforcing structure of the unit case L-side element 14A can be simplified.

  12 and 13 are substantially horizontal cross-sectional views respectively showing power units of a fifth modification and a sixth modification of the reference example of the motorcycle with an electric motor according to the present invention. In these fifth and sixth modifications, the same parts as those in the reference example are given the same reference numerals, and the description thereof is omitted.

  In both of these modified examples, the generator 17 is not installed in the power units 49 and 50. In the fifth modification shown in FIG. 12, the power unit case 51 is composed of a unit case L side element 51A and a unit case R side element 51B, and the electric motor 13 is fixed to the unit case R side element 51B. Thus, since the electric motor 13 is installed in the unit case R side element 51B located on the opposite side of the unit case L side element 51A that houses the V belt transmission mechanism 12, the integrated shaft 23 is provided as in the reference example. A large number of the bearings 25, 26 and 27 can be installed, and the large electric motor 13 can be adopted.

  Further, in the power unit 50 in the sixth modification of the reference example shown in FIG. 13, the power unit case 52 is a single case, the V-belt transmission mechanism 12 is accommodated in the power unit case 52, and the electric motor 13 is It is attached. Therefore, the power unit 50 can be made compact, and the power unit 50 can be mounted on a small scooter type motorcycle.

  FIG. 15 is a left side view showing a first embodiment of the motorcycle with an electric motor according to the present invention, and FIG. 14 is a sectional view taken along the line XIV-XIV in FIG. In the first embodiment, the same parts as those in the reference example are denoted by the same reference numerals and the description thereof is omitted.

  In the power unit 53 of the electric motor-equipped motorcycle in the first embodiment, as shown in FIG. 14, a primary driven gear 55 is formed integrally with the drive shaft 54 of the V-belt transmission mechanism 12, and a V-belt transmission is provided at one end of the drive shaft 54. The mechanism 12 is provided with a power generation magnet 56 at the other end.

  The motor shaft 57 of the electric motor 13 is a separate shaft from the drive shaft 54 of the V-belt transmission mechanism 12, and is rotationally integrated with the primary drive gear 58, so that the driving force of the electric motor 13 is the primary drive gear 58 and the primary driven gear. It is transmitted to the drive shaft 54 via the gear 55.

  The power unit case 59 is configured by joining a unit case L-side element 59A and a unit case R-side element 59B at the gear centerline Q position of the primary drive gear 58 and the primary driven gear 55. The electric motor 13 is fixed to the unit case R side element 59B by using the mounting bolt 16, and the primary drive gear 58 is rotatably supported by the unit case L side element 59A by using the bearing 60. The drive shaft 54 is rotatably supported by the unit case L side element 59A and the unit case R side element 59B using bearings 61, 62 and 63.

  The power generation magnet 56 includes a stator 64 fixed to the unit case R-side element 59B, and a rotor 65 fixed to the other end of the drive shaft 54 and rotating around the outer periphery of the stator 64. A cooling fan 66 is fixed to the outside of the rotor 65. The power generation magnet 56 and the electric motor 13 are surrounded by a motor / magnet cover 67, and the cooling air is guided to the electric motor 13 side in the motor / magnet cover 67 by the rotation of the cooling fan 66.

  A motor support boss 68 is integrally formed on the unit case L side element 59 </ b> A at a position facing the electric motor 13. The motor support boss 68 extends in the opposite direction of the electric motor 13 and is fixed to the clutch cover boss 70 extending from the clutch cover 69 to the front of the power unit 53 by using the mounting bolt 71. As described above, the electric motor 13 is supported by the unit case R-side element 59B using the mounting bolt 16, and is supported by the clutch cover 69 by the motor support boss 68 and the clutch cover boss 70.

  Further, the gear center line Q is installed at a position eccentric from the power unit center line O by an offset amount e toward the V belt transmission mechanism 12 side. Further, in this embodiment, the generator 17 as in the above reference example is not installed, and the electric motor 13 is connected to the front front end position, the front upper position or the front lower position of the power unit 53 as shown in FIGS. Installed in each position. Alternatively, a plurality of electric motors 13 may be installed at the above positions at the same time.

  According to the first embodiment, the heavy electric motor 13 is directly supported by the unit case L-side element 59B and indirectly supported by the clutch cover 69 via the motor support boss 68 and the clutch cover boss 70. Therefore, the reinforcing structure of the unit case R side element 59B can be simplified as compared with the case where the electric motor 13 is supported only by the unit case R side element 59B. In addition, a separate reinforcing bracket is not required. In addition, the dead space can be effectively used to make the power unit 53 compact.

  In addition, since the heavy electric motor 13 is installed in the front part of the power unit 53 and approaches the connecting part of the power unit 53 to the vehicle body frame 1, the weight under the spring is substantially reduced, which can contribute to the improvement of riding comfort. .

  Furthermore, when three electric motors 13 are arranged, each electric motor 13 is arranged so as to form a V shape when viewed from the side of the vehicle body, so that dead space can also be effectively used in this respect.

  Further, since the gear center line Q of the primary drive gear 58 and the primary driven gear 55 is installed eccentrically by the offset amount e from the unit center line O of the power unit 53 to the V belt transmission mechanism 12 side, the left and right widths of the power unit 53 are increased. The large electric motor 13 can be installed without expanding. Further, the length of the motor support boss 68 can be shortened.

  In the first embodiment, the case where the helmet 5 is stored in an upright state in the article storage chamber 6 is described as a two-wheeled vehicle with an electric motor. However, the first modification of the first embodiment shown in FIGS. The helmet 5 may be of a type in which the helmet 5 is installed in an inverted state in the article storage chamber 6. Further, as shown in the second modification of the first embodiment shown in FIGS. It may be of the type installed in the article storage room 6 in a lying state.

  FIG. 21 is a schematic horizontal sectional view showing a power unit of a motorcycle with an electric motor according to a third modification of the first embodiment of the present invention. In the third modification, the same parts as those of the second modification are denoted by the same reference numerals, and the description thereof is omitted.

  In the power unit 72 of the third modification of the first embodiment, only the magnet cover 73 is installed on the unit case R side element 59B, and the motor support boss 74 is integrally formed adjacent to the electric motor 13 on the magnet cover 73. Is done. The electric motor 13 is fixed to the unit case R side element 59 </ b> B using the mounting bolt 16 and is fixed to the motor support boss 74 using the mounting bolt 75.

  Therefore, since the electric motor 13 is supported by the unit case R side element 59B and the magnet cover 73, the reinforcing structure of the unit case R side element 59B can be simplified as in the second modification. In addition, the same effects as those of the second modification are obtained.

  FIG. 22 is a schematic horizontal sectional view showing a power unit of a motorcycle with an electric motor in a fourth modification of the first embodiment. In the fourth modified example, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the power unit 76 in the fourth modified example, the electric motor 13 is installed on the power unit case L side element 59A, and is fixed to the unit case L side element 59A using the mounting bolt 16. Furthermore, the electric motor 13 is fixed to the motor support boss 78 extending from the clutch case 73 to the front of the power unit 76 by using the mounting bolt 71. Therefore, in the fourth modification, the electric motor 13 is supported by the unit case L side element 59A and the clutch cover 77, so that the reinforcing structure of the unit case L side element 59A can be simplified.

  In the fourth modification, the gear center line Q that is the meshing position of the primary drive gear 58 and the primary driven gear 55 is provided so as to coincide with the center line O and the vehicle body center line of the power unit 76 in plan view of the vehicle body. Thereby, the right and left weight balance of the power unit 76 can be adjusted, and the steering stability of the two-wheeled vehicle with the electric motor can be improved. The power generation magnet 56 is covered with a magnet cover 79 as in the third modification of the second embodiment.

  24 is a right side view showing a second embodiment of the two-wheeled motor vehicle according to the present invention, and FIG. 23 is a cross-sectional view taken along line XXIII-XXIII in FIG. In the second embodiment, the same parts as those in the previous embodiment are designated by the same reference numerals and the description thereof is omitted.

  In the power unit 80 according to the second embodiment, the electric motor 13 is fixed to the unit case R side element 81B using the mounting bolts 16, and the generator 17 is fixed to the unit case L side element 81A using the mounting bolts 18. The unit case L side element 81A and the unit case R side element 81B are joined at the gear center line Q of the primary drive gear 58 and the primary driven gear 55 to constitute a power unit case 81. In the second embodiment, the gear center line Q is configured to coincide with the power unit center line O of the power unit 80.

  In the second embodiment, the center line R1 of the rear wheel 10 is installed eccentrically by the offset amount ε from the power unit 80 in the opposite direction of the V-belt transmission mechanism 12, so that the type and shape of the rear wheel 10, and the rear wheel There are less restrictions on the outer diameter of the rear wheel 10 and the rear wheel 10 can be easily attached and detached. Reference numeral R <b> 2 indicates a center line of the large-diameter rear wheel 10.

  Further, the motor shaft 57 of the electric motor 13 and the generator shaft 40 of the generator 17 are fitted to the primary drive gear 58 so as to rotate together and are configured coaxially. Thus, since the generator shaft 40 is configured coaxially with the motor shaft 57, the drive structure of the generator 17 can be simplified and the dead space can be used effectively.

  Further, a primary driven gear 55 is integrally formed with the drive shaft 22 of the V-belt transmission mechanism 12. Further, a reinforcing rib 82 is formed between the drive shaft 22 and the mission drive shaft 33 in the unit case L-side element 81A. Thus, since the reinforcing rib 82 is formed in the unit case L side element 81A, the rigidity of the unit case L side element 81A can be improved using a dead space.

  Further, as shown in FIG. 24, since the mount bracket 9 of the power unit 80 is installed between the electric motor 13 and the center stand 83, the power unit 80 can be suspended using the dead space effectively. Furthermore, when the electric motor 13 is installed at the position indicated by the broken line in FIG. 24 and a plurality of electric motors are mounted, the mounting bracket 84 is installed at an intermediate position between the plurality of electric motors 13 as indicated by a two-dot chain line. Thus, the dead space may be effectively used.

Sectional drawing which follows the II line | wire of FIG. The right view which shows the reference example of the two-wheeled vehicle with an electric motor which concerns on this invention. The top view of the two-wheeled motor vehicle of FIG. Sectional drawing which follows the IV-IV line of FIG. The substantially horizontal sectional view which shows the power unit of the two-wheeled vehicle with an electric motor in the 1st modification of the reference example of this invention, and a 4th modification. The left view which shows the two-wheeled vehicle with an electric motor carrying the power unit of FIG. The top view of the two-wheeled vehicle with an electric motor of FIG. The left view which shows the two-wheeled vehicle with an electric motor in the 2nd modification of the reference example of this invention. The top view of the two-wheeled vehicle with an electric motor of FIG. The left view which shows the two-wheeled vehicle with an electric motor in the 3rd modification of the reference example of this invention. The top view of the two-wheeled vehicle with an electric motor of FIG. The substantially horizontal sectional view which shows the power unit of the two-wheeled vehicle with an electric motor in the 5th modification of the reference example of this invention. The substantially horizontal sectional view which shows the power unit of the two-wheeled vehicle with an electric motor in the 6th modification of the reference example of this invention. Sectional drawing which follows the XIV-XIV line | wire of FIG. 1 is a left side view showing a first embodiment of a motorcycle with an electric motor according to the present invention; FIG. The top view of the two-wheeled vehicle with an electric motor of FIG. The left view which shows the two-wheeled vehicle with an electric motor in the 1st modification of 1st Example of this invention. The top view of the two-wheeled motor vehicle of FIG. The left view which shows the two-wheeled vehicle with an electric motor in the 2nd modification of 1st Example of this invention. The top view of the two-wheeled motor vehicle of FIG. FIG. 7 is a schematic horizontal sectional view showing a power unit of a two-wheeled vehicle with an electric motor in a third modification of the first embodiment of the present invention. FIG. 7 is a schematic horizontal sectional view showing a power unit of a two-wheeled vehicle with an electric motor in a fourth modification of the first embodiment of the present invention. Sectional drawing which follows the XXIII-XXIII line | wire of FIG. The right view which shows 2nd Example of the two-wheeled vehicle with an electric motor which concerns on this invention. The top view of the two-wheeled vehicle with an electric motor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 8 Power unit 10 Rear wheel 12 V belt transmission mechanism 13 Electric motor 17 Generator 21 Motor shaft 22 Drive shaft 23 Integrated shaft 24 Generator drive sprocket 40 Generator shaft 41 Generator driven shaft 42 Generator driven sprocket 43 Generator drive chain 53 Power unit 59 Power unit case 68 Motor support boss 69 Clutch cover 70 Clutch cover boss 71 Mounting bolt 80 Power unit R1, R2 Rear wheel center line ε Rear wheel offset amount O Power unit center line

Claims (1)

An electric motor-equipped two-wheeled vehicle having a handle provided at a front portion of a vehicle body frame and a power unit provided with a power transmission mechanism for transmitting a driving force of the electric motor to a rear wheel below the seat and behind the front wheel. Are installed on the outer periphery of the power unit so that the motor shaft of the electric motor and the drive shaft of the power transmission mechanism are separated from each other, and the driving force of the motor shaft is transmitted to the drive shaft by a plurality of gears. A two-wheeled vehicle with an electric motor, wherein the meshing position of the plurality of gears is substantially on the center line of the vehicle body in a plan view of the vehicle body.

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