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A fuel injection pump has a housing (3) with a flange (5) and a bore (40) in which are arranged a sleeve (2) and a pump piston (1). A valve body (4) with a hollow core space (20) is located in an axial end portion of the sleeve (2). The valve body (4) has at both axial end portions (11, 12) hydrauli

A fuel injection pump has a housing (3) with a flange (5) and a bore (40) in which are arranged a sleeve (2) and a pump piston (1). A valve body (4) with a hollow core space (20) is located in an axial end portion of the sleeve (2). The valve body (4) has at both axial end portions (11, 12) hydraulic dampening means. In the zone of the top dead center of the pump piston (1), its head (13) cooperates directly with the axial end portion (11) of the valve body (4), actuating a valve seat (27). This valve seat (27) located between the valve body (4) and the sleeve (2) acts as a fuel intake and relief valve for the fuel delivery system. A fluid spring including a cylinder chamber (42) and an additional piston (44), as well as an actuating element (19), are located adjacent an axial end of the pump piston (1 ). The actuating element (19) is linked with a drive.

대표청구항 ▼

A fuel injection pump for an internal combustion engine, in which the fuel injection pump includes a pump piston being guided in a sleeve (2), a valve arrangement located at an axial end of the pump piston and between a cylinder chamber and an injection line and including a valve body which cooperat

A fuel injection pump for an internal combustion engine, in which the fuel injection pump includes a pump piston being guided in a sleeve (2), a valve arrangement located at an axial end of the pump piston and between a cylinder chamber and an injection line and including a valve body which cooperates with the pump piston when the pump piston is at a top dead center position and a device for establishing the piston stroke, with the distinction that the valve body (4) includes a lower end portion (11) extendable into the cylinder chamber (10) and an upper end portion (12) located adjacent the injection line (7) in a pump housing (3); a first hydraulic damping device located between a head part (13) of the pump piston (1) and the lower end portion (11) of the valve body (4); a second hydraulic damping device located adjacent the upper end portion (12) of the valve body (4) for braking movement of the valve body (4) in a direction away from the pump piston (1); and the valve body (4) being guided in a hollow chamber (14) in the sleeve (2) which connects the cylinder chamber (10) and the injection line (7); the second hydraulic damping device includes a pressure chamber (24) located around a portion of the valve body (4); a guide bore (22) extending from the pressure chamber (24) in which the upper end portion (12) of the valve body (4) is guided; an annular piston surface (25) located on the valve body (4) in the pressure chamber (24); and an annular gap (50) located between the exterior periphery of the upper end portion (12) of the valve body (4) and the inner periphery of the guide bore (22); the ratio of the cross-sectional area of the annular gap (50) to the cross-sectional area of the pump piston (1) is between 1:600 and 1:1100.