NOVELTY - The accumulator (10) has a base (12) that is provided with a fluid port which is arranged in communication with a cavity (30) for transmitting hydraulic fluid in and out of the cavity. A cover (14) is arranged over the open end of base and secured to the base by a fastener. A piston (50) is provided within base and cover, sealed to the inner surface of cover and translatable along preset axis. A spring (62) is fixed within base and cover and located axially between piston and cover for biasing the piston towards the base. A support portion is coupled to the outside surface of cover.    USE - Composite pressure accumulator e.g. composite spring loaded accumulator for use in motor car power train. Can also be used in fuel injectors, air conditioning systems and hydraulic control system of automatic transmission to enable stop-start operations or hybrid hydraulic operation.    ADVANTAGE - By distributing reaction forces of the piston and springs on the metal connections between the base and cover, and between the accumulator and fixed mount, the stress on the base and cover is reduced and the base and cover can handle greater force load. Hence the base and cover can be manufactured using plastic molding without reducing the charge capacity of the accumulator. Increased manufacturing flexibility provides cost savings and weight savings which improve the efficiency of the motor car. The base and cover is precision molded to provide concentricity between the base and the cover through precise molded concentric relationships between the inner surfaces of base and the cover. The inner surface of the base is molded using precision minimum draft die or mandrel to achieve accuracy and straightness without requiring machining operation. By arranging the first bushing on the oil side of the radial seal, the first bushing is lubricated and dryness on the inner surface of first bushing is prevented, so that the damage of the cover is prevented.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the composite pressure accumulator.    Composite pressure accumulator (10)    Base (12)    Cover (14)    Cavity (30)    Piston (50)    Spring (62)