Piston pump with cylinder housing fixed on combustion engine - has spring loaded piston moved by pressure generated in combustion chamber

摘要

The piston pump comprises a housing (12) and a spring-loaded (7) piston (3) in a cylindrical housing bore (5). The housing is arranged on a combustion engine such that the piston is driven by the combustion pressure in the combustion chamber (18). The housing may be arranged in the cylinder head (13) of the engine. A piston (2) may separate the piston (3) from direct contact with combustion gas. The piston (2) may have a larger diameter than piston (3). The space (4) between the pistons (2, 3) may be filled with hydraulic fluid. This fluid may be the same as that handled by the pump, the space (4) being connected to the pump inlet (8) via a non-return valve (10, 11).