Electric motor driven vehicle and power unit thereof
First Claim
1. A drive system for an electric motor driven vehicle comprising:
- an electric motor;
a driving wheel; and
a belt type stepless speed change transmission for transmitting the rotation of said electric motor to said driving wheel to run the vehicle;
said belt type stepless speed change transmission functions as torque reducing means for maintaining motor speed within a range preselected to be within a desired percentage of maximum motor efficiency.
1 Assignment
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Accused Products
Abstract
The invention relates to an electric motor driven vehicle having a driving unit assembled with a motor and transmission mechanism. In order to avoid a load in a low rotational state of the motor, the transmission mechanism is connected with the motor and driving wheel within a range of predetermined rotational numbers in which the motor approaches the vicinity of maximum efficiency. Accordingly, motor driving is possible from the start, and because of the small electric power and the low heat generating quantity, cruising distance is extended and the apparatus is consequently made to be compact and of light weight. The transmission is provided with an automatic starting clutch and an automatic transmission is used as the automatic transmission, operation of the motor near the vicinity of maximum efficiency can always be maintained in the usual speed change range. The driving unit can be constructed compactly as a power unit of swing type. Further, an advantageous cooling mechanism of the motor and a wiring structure of an electric power supply cord are disclosed herein.
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Citations
28 Claims
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1. A drive system for an electric motor driven vehicle comprising:
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an electric motor; a driving wheel; and a belt type stepless speed change transmission for transmitting the rotation of said electric motor to said driving wheel to run the vehicle; said belt type stepless speed change transmission functions as torque reducing means for maintaining motor speed within a range preselected to be within a desired percentage of maximum motor efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A drive system for an electric motor driven vehicle comprising:
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an electric motor, coupled to an external control means and battery supply, for driving a rotary shaft; a final reducing gear, operatively coupled to a drive wheel of the electric motor driven vehicle, for rotating said drive wheel; a belt type stepless speed change transmission, operatively coupling said electric motor to said final reducing gear, for driving said final reducing gear in response to rotation of said rotary shaft; said electric motor, said final reducing gear and said belt type stepless speed change transmission housed within a single unitary housing; said battery supply comprising a plurality of individual battery supplies, coupled together in parallel for supplying power to said electric motor, each comprising a battery coupled in series with a switch which couples a respective individual battery supply to said electric motor upon actuation, and a plurality of lamps, each coupled in parallel across a respective one of said batteries of said individual battery supplies, for indicating discharge capacity and operational status of said individual battery supplies once said batteries are coupled to said electric motor upon actuation of said switches.
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15. A power unit for an electric motor driving vehicle comprising:
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a driving wheel, rotatably supported to a transmission case and pivotally fixed to a vehicle body so as to be able to oscillate, for transporting the electric motor driving vehicle; an electric motor, housed within a motor housing mounted to a side portion of said transmission case, for rotatably driving said driving wheel; belt type stepless speed change transmission means, housed within said transmission case, for rotatably coupling said driving wheel to said electric motor; and port means, coupled between said transmission case and said motor housing, for transferring cooling air therebetween, said electric motor and said belt type stepless speed change transmission being cooled by common cooling fan which generates said cooling air. - View Dependent Claims (16, 17)
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18. A power unit for an electric motor driving vehicle comprising:
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a driving wheel, rotatably supported to a transmission case and pivotally fixed to a vehicle body so as to be able to oscillate, for transporting the electric motor driving vehicle; an electric motor, housed within a motor housing mounted to a side portion of said transmission case, for rotatably driving said driving wheel; belt type stepless speed change transmission means, housed within said transmission case, for rotatably coupling said driving wheel to said electric motor; and duct means, a first end being coupled to an interior of said motor housing opposite that of said belt type stepless speed change transmission means and a second end being coupled to an interior space of the electric motor driving vehicle, for forcibly transferring cooling air from said interior space of the electric motor driving vehicle to said interior of said motor housing, an electric power supply cord of said electric motor being arranged with said duct means.
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19. A drive system for an electric motor driven vehicle comprising:
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an electric motor, coupled to an external control means and battery supply, for driving a rotary shaft; a final reducing gear, operatively coupled to a drive wheel of the electric motor driven vehicle, for rotating said drive wheel; a belt type stepless speed change transmission, operatively coupling said electric motor to said final reducing gear, for driving said final reducing gear in response to rotation of said rotary shaft, said electric motor, said final reducing gear and said belt type stepless speed change transmission housed within a single unitary housing; and cooling means, for cooling said electric motor and said belt type stepless speed change transmission, comprising motor housing, mounted on a first end of said electric motor away from said rotary shaft, for covering said electric motor, said motor housing including a duct vent receiving cooling air, a first vent for directing said cooling air to said electric motor from said motor housing, a first fan, operatively coupled to and supported by said rotary shaft within said electric motor, for circulating said cooling air within said electric motor, a second vent for directing said cooling air to said belt type stepless speed change transmission from said electric motor, and a second fan, coupled to a first fixed face of a driving pulley formed on an end of said rotary shaft within said belt type stepless speed change transmission, for circulating said cooling air within said belt type stepless speed change transmission and out an exterior vent located away from said first fixed face. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. An electric motor driven bicycle comprising:
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a vehicle body including front, central, and rear frame portions and a drive wheel, having a drive wheel axis, coupled to said rear frame portion; and a drive system contained in a single unitary housing, coupled to said central frame portion and said drive wheel, comprising an electric motor, coupled to an external control means and battery supply, for driving a rotary shaft, a final reducing gear, operatively coupled to said drive wheel, for rotatably driving said drive wheel, and a belt type stepless speed change transmission, operatively coupling said rotary shaft and said final reducing gear, for driving said final reducing gear, said battery supply, operatively coupled to said central frame portion substantially planar to a longitudinal axis of said central frame portion at a height substantially equal to said drive wheel axis, for supplying power to said electric motor, said battery supply comprising plural storage compartments for receiving plural batteries, said plural storage compartments straddling said central frame portion with said central frame portion intermediate therebetween so that said plural batteries are substantially planar to a lowest portion of said central frame portion. - View Dependent Claims (28)
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Specification