Abstract: A fluid pump comprises a casing at the rear of which is secured a fixed plate having a forward open longitudinal groove with a C-shaped transversal cross-section. A movable plate is placed at the front of the fixed plate and is held in a close sliding contact with the fixed plate to seal the groove to form a pumping chamber. The movable plate carries an integral pumping member which is in the form of a split-tube extending into the pumping chamber. The movable plate is driven by an eccentric drive so that the pumping member within the pumping chamber performs as oscillatory movement along a circular trajectory with its inner wall in a sealing contact with the inner wall of the pumping chamber, and with its outer wall in a sealing contact with the outer wall of the pumping chamber, thereby performing the intake and compression strokes.

Abstract: Around an engine-body of a vehicle, several auxiliary machinery such as an air-conditioner and a power steering-pump are disposed. Pulleys of said auxiliary machinery are driven by means of an endless belt or endless belts by a driving pulley of the engine. In order to obtain the most effective operation of the engine, consideration should be given to the degree of the power loss for driving the auxiliary machinery.For this purpose, according to the present invention, the order by which said several driven pulleys are driven by said driving pulley is determined by the magnitude of the driven torques of the corresponding auxiliary machinery along the running direction of the endless belt toward the driving pulley.