a wheel or in the grind of vehicles integrated pumping system for airflow to and from the wheels of a vehicle to control and the pressure in the tyres of vehicles to rules

摘要

The pump unit is provided with a cylinder (11), incorporated in the automobile wheel hub or mounted on the inside of the wheel hub so that its centre line passes through the centre of the wheel, a pair of discs dividing the cylinder into 3 successive cylinder sections and provided with a spring-loaded double piston operated via a DC motor.