Abstract: A carbon brush for a fuel pump includes a brush body and a lead wire connected to the brush body, and the brush body has carbon and polyether ether ketone as main components. Abnormal wear does not occur even if a fuel pump motor is operated at a high voltage.

Abstract: A carbon brush for a fuel pump includes a brush body and a lead wire connected to the brush body, and the brush body has carbon and polyether ether ketone as main components. Abnormal wear does not occur even if a fuel pump motor is operated at a high voltage.

Abstract: A fuel pump includes a pump part, a motor part, two brushes, two pigtails, and an urging member. Each pigtail is made of a linear conductive member and includes one end portion electrically and mechanically connected to its corresponding brush. The urging member includes one end engaged with a motor casing, and the other end pressing and urging each brush against a commutator from its other axial end face. A distance between an inclined surface of the brush and a sliding surface of the commutator in an axial direction of the brush becomes longer toward a rear side of the brush in a rotation direction of the commutator. A side surface of each brush and an inner wall of the motor casing, which defines two brush accommodating chambers, define a clearance therebetween. Each pigtail includes an extension portion extending from its one end portion toward the rear side in the rotation direction of the commutator.

Abstract: A fuel pump is constructed of a pump casing, a rotating member and a reinforcing member. The pump casing internally forms a pump chamber, in which the rotating member is received, such that the rotating member rotates to pressurize fuel in the pump chamber. The reinforcing member reinforces the pump casing against fluidic force applied to the pump casing. The pump casing is formed of resin. The reinforcing member is insert-formed in the pump casing, so that the reinforcing member is at least partially embedded in the pump casing.

Abstract: A fuel pump includes a rotor, a rotating member, a pump portion, and a housing. The rotating member is rotated by the rotor to generate suction force for drawing fuel. The pump portion includes a pump casing that receives the rotating member. The housing receives the rotor and the pump portion. The housing has an inner circumferential periphery. The pump casing has an outer circumferential periphery. At least one of the inner circumferential periphery of the housing and the outer circumferential periphery of the pump casing has a plurality of protrusions that protrudes in a substantially radial direction. The plurality of protrusions is arranged in a circumferential direction. The plurality of protrusions is press-inserted into at least one of the inner circumferential periphery of the housing and the outer circumferential periphery of the pump casing.

Abstract: An impeller is employed for a fuel pump and boosts a pressure of fuel by rotating the fuel in a pump passage formed in the fuel pump in a rotational direction of the impeller. The impeller includes a plurality of vane grooves formed adjacent to each other in the rotational direction of the impeller and a plurality of vanes formed adjacent to each other in the rotational direction. Each one of the plurality of vanes divides one of adjacent two of the plurality of vane grooves from the other. A difference between a maximal value and a minimum value of an adjacent vane angle is set in a range of 2.5° to 4°. A fuel pump includes a motor unit, the impeller, and a casing member. The impeller is rotated by rotation driving force of the motor unit. The casing member rotatably receives the impeller and defines the pump passage.

Abstract: A bearing for a fuel pump includes a sliding layer made of mainly carbon, and a supporting layer made of mainly carbon and a metal. The supporting layer is connected to the sliding layer to support the sliding layer. Because the sliding layer of the bearing is made of mainly carbon, corrosion resistance of the bearing can be improved. Further, the supporting layer improves the strength of the bearing. Accordingly, the bearing with the two-layer structure effectively improves the corrosion resistance while the strength thereof can be increased. The bearing can be suitably used for the fuel pump. In this case, the bearing is press-fitted to a casing member on the supporting layer, and a rotary shaft of the fuel pump is slidably held in the bearing on the sliding layer.

Abstract: A fuel pump includes a rotor, a rotating member, a pump portion, and a housing. The rotating member is rotated by the rotor to generate suction force for drawing fuel. The pump portion includes a pump casing that receives the rotating member. The housing receives the rotor and the pump portion. The housing has an inner circumferential periphery. The pump casing has an outer circumferential periphery. At least one of the inner circumferential periphery of the housing and the outer circumferential periphery of the pump casing has a plurality of protrusions that protrudes in a substantially radial direction. The plurality of protrusions is arranged in a circumferential direction. The plurality of protrusions is press-inserted into at least one of the inner circumferential periphery of the housing and the outer circumferential periphery of the pump casing.

Abstract: A fuel pump is constructed of a pump casing, a rotating member and a reinforcing member. The pump casing internally forms a pump chamber, in which the rotating member is received, such that the rotating member rotates to pressurize fuel in the pump chamber. The reinforcing member reinforces the pump casing against fluidic force applied to the pump casing. The pump casing is formed of resin. The reinforcing member is insert-formed in the pump casing, so that the reinforcing member is at least partially embedded in the pump casing.

Abstract: In a fuel pump, an impeller is rotatably accommodated between a suction side cover and a pump casing. A pump channel of the suction side cover is positioned on an axial side opposite to a fuel discharge port with respect to the impeller. The impeller has blade grooves circumferentially outside and communicating holes circumferentially inside. A wall of a terminal end portion of the pump channel of the suction side cover has a guide portion directing from the blade grooves toward the communicating holes. The terminal end portion is pointed in shape in a rotation direction of the impeller. Fuel pressurized in the pump channel is guided from the blade grooves to the communicating holes at the terminal end portion without steeply reducing flow speed and flows through the communicating holes to the fuel discharge port.

Abstract: A fuel pump for an internal combustion engine includes a suction-side cover having a fuel inlet, an exhaust-side cover having a fuel outlet, an electric motor, a pump casing disposed between the electric motor and the suction-side cover, an impeller disposed between the suction-side cover and the pump casing to be rotated by the electric motor, and a cylindrical housing for accommodating the suction-side cover, the pump casing and the impeller. The suction-side cover is made of a resinous member that has a shoulder having a round surface in contact with a portion of the cylindrical housing that is clinched at the shoulder.

Abstract: A bearing for a fuel pump includes a sliding layer made of mainly carbon, and a supporting layer made of mainly carbon and a metal. The supporting layer is connected to the sliding layer to support the sliding layer. Because the sliding layer of the bearing is made of mainly carbon, corrosion resistance of the bearing can be improved. Further, the supporting layer improves the strength of the bearing. Accordingly, the bearing with the two-layer structure effectively improves the corrosion resistance while the strength thereof can be increased. The bearing can be suitably used for the fuel pump. In this case, the bearing is press-fitted to a casing member on the supporting layer, and a rotary shaft of the fuel pump is slidably held in the bearing on the sliding layer.

Abstract: A fuel pump includes an impeller and a passage member having a pump passage around the impeller, a fuel suction port and a fuel discharge port. The pump passage includes an arc-shaped fuel passage connected to the suction port and a terminal fuel passage connected to the discharge port. The discharge port is located outside the pump passage in the radial direction, and the terminal fuel passage is formed so that a portion of the terminal fuel passage is located radially more outside as the portion of the terminal fuel passage moves in the rotation direction of the impeller. The sectional area of the terminal fuel passage except spaces occupied by the impeller is approximately constant to prevent flow energy loss.

Abstract: A plane commutator includes a plurality of commutator segments made of carbon compound, a resinous boss member having a body portion supporting a base portion of the commutator segments and an outer peripheral portion supporting an outer periphery of the same and a plurality of metal base plates. Each metal base plate has a contact portion in contact with the base portion of the commutator segment, an axial portion extending along a peripheral portion of the boss member and a terminal portion. The axial portion of the metal base plates is disposed on an outer periphery of the plane commutator in parallel with the outer peripheral portions of the boss member to separate the outer peripheral portion from the body portion. The outer peripheral portion moves freely from the body portion as the metal base plates thermally expand.

Abstract: An impeller has a plurality of blades at an outer periphery thereof. Each of the adjacent blades define a groove space, and a partition wall is provided in the groove space. The partition wall is disposed at a center area of the groove space in an axial direction of the impeller for partitioning the groove space from a root of the blade. The blade inclines backwardly in the rotating direction at the root side thereof, and inclines frontwardly in the rotating direction at a radial outer end side thereof. A front face is inwardly concaved from both axial ends, and warps from the root to the radial outer end of the blade to form the concave such that the concave gradually becomes small from the root to the radial outer end.

Abstract: An impeller has a plurality of blades at an outer periphery thereof. Each of the adjacent blades define a groove space, and a partition wall is provided in the groove space. The partition wall is disposed at a center area of the groove space in an axial direction of the impeller for partitioning the groove space from a root of the blade. The blade inclines backwardly in the rotating direction at the root side thereof, and inclines frontwardly in the rotating direction at a radial outer end side thereof. A front face is inwardly concaved from both axial ends, and warps from the root to the radial outer end of the blade to form the concave such that the concave gradually becomes small from the root to the radial outer end.

Abstract: A plane commutator includes a plurality of commutator segments made of carbon compound, a resinous boss member having a body portion supporting a base portion of the commutator segments and an outer peripheral portion supporting an outer periphery of the same and a plurality of metal base plates. Each metal base plate has a contact portion in contact with the base portion of the commutator segment, an axial portion extending along a peripheral portion of the boss member and a terminal portion. The axial portion of the metal base plates is disposed on an outer periphery of the plane commutator in parallel with the outer peripheral portions of the boss member to separate the outer peripheral portion from the body portion. The outer peripheral portion moves freely from the body portion as the metal base plates thermally expand.

Abstract: When differential pressure between fuel flowing into a fuel control valve and fuel flowing out of the valve reaches a predetermined value, the biasing force of a compressed coil spring is countered and a shaft in the valve moves to the fuel upstream side so that a valve member is seated to terminate communication between the fuel inlet passage and the fuel outlet passage. This maintains fuel pressure at the fuel inlet passage and at the fuel outlet passage at different levels so that the fuel supply system maintains a high fuel pressure in the fuel rail to suppress fuel vapor generation during engine stoppage while also yet still providing an appropriate fuel injection pressure during rapid deceleration of the vehicle.

Abstract: A fuel pump of returnless type fuel supply system for a vehicle includes a pump case, an impeller disposed in the pump case and a pump passage connected between the fuel inlet port and fuel discharge port. The pump passage is composed of a guiding passage section connected to the fuel inlet and pressure section connected between the guiding section and the fuel discharge port, and the guiding section has a first vapor discharge port disposed near the fuel inlet port and a second vapor discharge port disposed near the pressure passage section. Thus, fuel vapor is discharged from the first and second vapor discharge ports along with a small amount of the fuel returning to the fuel tank.

Abstract: In a fuel pump control, until a rotational speed of an electrically-driven fuel pump rises to a predetermined speed, an electric current supplied to the fuel pump at an engine starting is increased higher than that normally supplied after engine starting thereby causing fast build-up of the fuel pressure. After the fuel pump reaches the predetermined speed, the electric current is decreased to a normal after-start current thereby suppressing a fuel pressure overshoot and resulting overrich mixture. Alternatively, a fuel pump speed is raised by the voltage control first at an engine starting operation, while switching the voltage control to the current control intermittently to detect the voltage applied to the fuel pump. When the detected voltage reaches a first predetermined voltage, the fuel pump speed is controlled exclusively by the current control.