Denso Corporation

Atsushi Sano

Katsumi Mori

Satoru Takamizawa

Takafumi Naitou

A housing has a cylinder and a compression chamber. A plunger is slidable in the cylinder and configured to pressurize fuel in the compression chamber. A cam is eccentric with respect to a shaft center axis of a camshaft and integrally rotatable with the camshaft. A sliding member is slidable around an outer circumferential periphery of the cam and configured to revolve around the shaft center axis in conjunction with rotation of the camshaft. The plunger is slidable on the sliding member and configured to convert the revolution into a linear movement. The cam and the sliding member are accommodated in the housing. The sliding member has an opening through which the outer circumferential periphery is partially exposed.

Fuel injection pump and method for assembling the same

A fuel supply system for an accumulator fuel injection system designed to inject fuel, as stored in an accumulator, into an internal combustion engine through a fuel injector The fuel supply system includes a feed pump working to pump the fuel out of a fuel tank and a fuel filter disposed between the feed pump and a high-pressure pump working to deliver the fuel to the accumulator. The fuel supply system also includes a return path and a control valve. When the pressure of the fuel between the fuel filter and the flow rate control valve exceeds a first set pressure, the control valve opens the return path to return the fuel from downstream to upstream of the feed pump to keep the pressure of fuel supplied to the flow rate control valve below the first set pressure, thereby controlling the flow rate of the fuel passing through the fuel filter.

Fuel supply system having fuel filter installed downstream of feed pump

A fuel supply pump includes a housing, a camshaft and a cam ring. The camshaft is rotatably supported in the housing. The cam ring is supported around a cam portion of the camshaft such that the cam ring is rotatable with respect to the cam portion. A washer member is provided between an axial end face of the cam portion and the housing, so that the cam portion and the camshaft is axially aligned. A bearing is circumferentially inserted between the end face of the cam portion and the cam ring. An axial end face of the cam ring defines oil grooves, so that lubricating oil flows from a cam chamber into a gap, which is formed between the cam portion and the bearing. Lubricating oil is sufficiently supplied to the periphery of the cam portion, so that the camshaft can be protected from seizure in the fuel supply pump.

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Toyoake, Japan

Atsushi Sano