Abstract: In a housing, a damper member is placed in a fluid chamber communicated with a pressurizing chamber, at which a plunger is reciprocated to pressurize fuel, and an opening of the fluid chamber is covered with a cover member. The damper member includes first and second-side diaphragms. A first-side support member is located between the damper member and the cover member and is engaged with a first-side outer peripheral portion of the first-side diaphragm and the cover member. A second-side support member is located between the damper member and the housing and is engaged with a second-side outer peripheral portion of the second-side diaphragm and the housing. The first and second-side support members are urged between the housing and the cover member.

Abstract: Between a movable core chamber and a fuel supply passage, a needle guide slidably supports a needle fixed to a movable core. The needle guide has a communication hole which fluidly connects the movable core chamber and the fuel supply passage. An opening sectional area of the communication hole is defined in such a manner that a fuel discharged amount decreases as an energization start time of a coil is delayed. In a suction stroke, it is restricted that the movable core and the needle bounce toward the fixed core after the needle biases a suction valve toward a stopper by means of a biasing force of a second spring. A relationship between the energization start time of the coil and the fuel discharged amount is properly maintained, so that the fuel discharged amount of the high-pressure pump can be controlled correctly.

Abstract: A damper device includes a first diaphragm having a first peripheral part, a second diaphragm having a second peripheral part, a first support portion disposed on the opposite side from the second peripheral part with respect to the first peripheral part, and a second support portion disposed on the opposite side from the first peripheral part with respect to the second peripheral part. The first peripheral part and the second peripheral part are supported between the first support portion and the second support portion. Radially outer sections of the first peripheral part, the second peripheral part, the first support portion, and the second support portion are integrally welded with each other.

Abstract: A housing of a high-pressure pump defines a passage communicating with a pressurizing chamber in which fuel is pressurized. The passage has an annular engagement groove which is radially outwardly concaved on its inner wall surface. A valve body is disposed in the passage. The engaged member is disposed inside of the passage wall. A valve body engaging member is comprised of a plurality of arc-shaped plate members, which form circular shape. The valve body engaging member is inserted into the engagement groove in such a manner as to be engaged with the valve body. A C-ring is firmly in contact with the plate members and biases them toward the engagement groove.

Abstract: A high-pressure pump has: a plunger; a pump body; a cover member for covering the pump body and forming a fuel chamber; a pulsation damper body constructed of upper and lower diaphragms with their peripheral edge portions joined and for reducing pressure pulsation in the chamber, the upper and lower diaphragms trapping gas having a given pressure between them; an upper support member having an upper ring-shaped part and an upper support body, the upper ring-shaped part being joined to the peripheral edge portion of the upper diaphragm, the upper support body extending from the upper ring-shaped part and abutting on the cover member; and a lower support member having a lower ring-shaped part and a lower support body, the lower ring-shaped part being joined to the peripheral edge portion of the lower diaphragm, the lower support body extending from the lower ring-shaped part and abutting on the pump body.

Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.

Abstract: A high-pressure pump is comprised of a lower housing, an upper housing and a cover, which are formed independently from each other. Thereby, shapes of the above can be simplified. Although the cylinder and the plunger receive a fuel pressure during a pressurization stroke, the upper housing and the cover do not receive fuel pressure directly from a pressurization chamber. Therefore, the upper housing and the cover can be made thin and light as much as possible.

Abstract: A gas chamber is placed adjacent to a variable volume chamber of a high pressure pump. The gas chamber includes an inner blocking wall, which borders on the variable volume chamber and contacts fuel in the variable volume chamber, an outer blocking wall, which is opposed to the inner blocking wall, and gas, which fills a space that is defined between the inner blocking wall and the outer blocking wall.

Abstract: A reservoir is located in a fuel tank. The reservoir is in a bottomed tubular shape having a periphery defining an opening, A lid member is located in the fuel tank and mounted to the periphery of the reservoir to close the opening. A pump unit is partially accommodated in the reservoir to discharge fuel stored in the reservoir to an exterior of the fuel tank. The pump unit is located at a position offset from a center axis of the lid member. The pump unit has a projection projected from the lid member to an exterior of the reservoir. A remaining quantity detector is configured to detect a quantity of fuel in the fuel tank. The remaining quantity detector is located at a remaining space remaining in the fuel tank. The remaining space is located on the lid member and located around the projection.

Abstract: A support shaft connects between a flange and a pump unit. An intermediate member, which connects between the support shaft and pump unit, enables a relative positional change between the support shaft and the pump unit in an axial direction of the support shaft. The intermediate member limits a relative positional change between the support shaft and the pump unit in a circumferential direction of the support shaft. A resilient member is received in the support shaft and exerts a restoring force in an axial direction of the support shaft to urge the pump unit, which is movable relative to the support shaft in the axial direction, toward a bottom portion of the fuel tank.

Abstract: A reservoir is in a bottomed tubular shape and located in a fuel tank. A lid member closes an opening of the reservoir. A pump unit discharges fuel stored in the reservoir to an exterior of the fuel tank. The pump unit is supported by a holding portion of the lid member.

Abstract: A valve member of a pressure relief valve has a shaft portion, a pressure receiving portion, and a guide portion, wherein the valve member is axially movable in a fuel return passage. When a forward end of the shaft portion is seated on a valve seta, the fuel return passage is closed, while the shaft portion is separated from the valve seat the fuel return passage is opened. A notched portion is formed at an outer wall of the guide portion to thereby form an outer-surface passage. A fuel inlet port is formed in the valve member for communicating a fuel inlet chamber to the fuel return passage at a downstream side of the valve member.

Abstract: A constant-residual-pressure valve is disposed in a communication passage connecting a high-pressure fuel passage through which pressurized fuel flows with a low-pressure fuel passage through which the fuel flows toward a high-pressure pump. The constant-residual-pressure valve includes a valve body, a spring, and a spring stopper. The valve body can sit on a valve seat formed in an inner passage. The spring biases the valve body toward the valve seat. The spring stopper has a downstream-orifice of which flow passage area is smaller than that of a passage upstream of the valve seat. Thereby, cavitation between the valve body and the valve seat is less generated.

Abstract: A high-pressure pump includes a plunger for pressurizing a fuel, a cylinder accommodating the plunger reciprocatably in its axial direction and a pump body. The pump body defines a pressurization chamber, a low-pressure fuel passage hydraulically connecting a fuel inlet and the pressurization chamber, and a discharge passage. The pump body further defines a cylindrical space around the cylinder. The fuel flows into the cylindrical space from the low-pressure fuel passage so as to cool the cylinder. The entire outer surface of the cylinder can be surely cooled.

Abstract: A housing of a high-pressure pump defines a passage communicating with a pressurizing chamber in which fuel is pressurized. The passage has an annular engagement groove which is radially outwardly concaved on its inner wall surface. A valve body is disposed in the passage. The engaged member is disposed inside of the passage wall. A valve body engaging member is comprised of a plurality of arc-shaped plate members, which form circular shape. The valve body engaging member is inserted into the engagement groove in such a manner as to be engaged with the valve body. A C-ring is firmly in contact with the plate members and biases them toward the engagement groove.

Abstract: A constant residual pressure valve is provided with a valve body, a valve seat, a communication passage, and an orifice upstream of the valve seat. A cylindrical passage is arranged between the orifice and the valve seat in such a manner as to introduce cavitation bubbles toward the valve seat. The cavitation bubbles are generated in the fuel discharged from the orifice. When the cavitation babbles are collapsed, the foreign matters accumulated on the third valve seat 63 and the valve body 69 are removed.

Abstract: A pressure control valve is provided in a fuel return pipe connected between a high pressure fuel pipe and a fuel pressurizing chamber of a high pressure pump. A pressure relief valve is opened when fuel pressure in a fuel delivery pipe is higher than a first pressure. A first valve body of the pressure relief valve is brought into contact with a stopper so that a movement of the first valve body is limited. A pressure holding valve, which is provided in an inside of the first valve body, is opened when the fuel pressure in the fuel delivery pipe is larger than a second pressure. When the pressure relief valve is opened and the first valve body crashes into the stopper, a lifting amount of a second valve body of the pressure holding valve is increased by inertia of the second valve body, so that extraneous material attached to the second valve body can be removed.

Abstract: In a housing, a damper member is placed in a fluid chamber communicated with a pressurizing chamber, at which a plunger is reciprocated to pressurize fuel, and an opening of the fluid chamber is covered with a cover member. The damper member includes first and second-side diaphragms. A first-side support member is located between the damper member and the cover member and is engaged with a first-side outer peripheral portion of the first-side diaphragm and the cover member. A second-side support member is located between the damper member and the housing and is engaged with a second-side outer peripheral portion of the second-side diaphragm and the housing. The first and second-side support members are urged between the housing and the cover member.