Abstract: A drum brake for braking a wheel disposed on the inside in the radial direction of an electric motor. The drum of the drum brake and an electric motor are disposed separate from each other, and thus wear powders of a brake shoe do not adhere to a permanent magnet of the electric motor. As a result, the wear powders do not adversely influence the performance of the electric motor, and the performance of the electric motor is maintained. The electric motor and the drum brake are disposed concentrically, so that the width of the wheel is reduced. Thus, a small and compact wheel is realized.

Abstract: A vehicle ready for a card key and a radio communication system for a vehicle which utilizes a card key wherein transmission and reception functions are incorporated in a card key to be loaded onto a vehicle, thereby allowing communication between vehicles. A card key loaded on a two-wheeled vehicle communicates with a first card key loaded in a first card key receiving slot of a four-wheeled vehicle. Further, a microphone, a speaker and a transmitter-receiver are provided on a helmet for a driver, and the card key communicates also with the transmitter-receiver on the helmet. Similarly, a card key loaded on a second two-wheeled vehicle communicates with a second card key loaded in second card key receiving slot of the four-wheeled vehicle and the transmitter-receiver of the helmet worn by the driver of the second two-wheeled vehicle.

Abstract: A controller for controlling the rotation of a motor is disposed inside a casing of a power unit for transmitting the rotation of the motor to a driving wheel. An induction-type switch for operating the controller is provided inside the casing of the power unit. A power source converter is provided for driving electrical equipment on the vehicle, and is disposed inside the casing of the power unit. Further, an accelerator opening sensor for detecting the magnitude of an output demand for the motor is provided, and is disposed inside the casing of the power unit. This arrangement concentrates the mass into the power unit, and encloses the high voltage system within the power unit.

Abstract: A vehicle ready for a card key and a radio communication system for a vehicle which utilizes a card key wherein transmission and reception functions are incorporated in a card key to be loaded onto a vehicle, thereby allowing communication between vehicles. A card key loaded on a two-wheeled vehicle communicates with a first card key loaded in a first card key receiving slot of a four-wheeled vehicle. Further, a microphone, a speaker and a transmitter-receiver are provided on a helmet for a driver, and the card key communicates also with the transmitter-receiver on the helmet. Similarly, a card key loaded on a second two-wheeled vehicle communicates with a second card key loaded in second card key receiving slot of the four-wheeled vehicle and the transmitter-receiver of the helmet worn by the driver of the second two-wheeled vehicle.

Abstract: A drum brake for braking a wheel disposed on the inside in the radial direction of an electric motor. The drum of the drum brake and an electric motor are disposed separate from each other, and thus wear powders of a brake shoe do not adhere to a permanent magnet of the electric motor. As a result, the wear powders do not adversely influence the performance of the electric motor, and the performance of the electric motor is maintained. The electric motor and the drum brake are disposed concentrically, so that the width of the wheel is reduced. Thus, a small and compact wheel is realized.

Abstract: A controller for controlling the rotation of a motor is disposed inside a casing of a power unit for transmitting the rotation of the motor to a driving wheel. An induction-type switch for operating the controller is provided inside the casing of the power unit. A power source converter is provided for driving electrical equipment on the vehicle, and is disposed inside the casing of the power unit. Further, an accelerator opening sensor for detecting the magnitude of an output demand for the motor is provided, and is disposed inside the casing of the power unit. This arrangement concentrates the mass into the power unit, and encloses the high voltage system within the power unit.

Abstract: An engine stopping/starting control unit having improved accelerating performance. A charging limiting device is provided which limits the charge provided to a generator when the vehicle is stopped. The decreased charging allows for better performance when the vehicle accelerates from a stopped states. Also, the vehicle headlight can be dimmed while the vehicle is stopped, which reduces the load on the generator. An acceleration detector detects when the vehicle accelerates during running, and can decrease the generator load in response to the acceleration.