Abstract: In order to provide a diaphragm type fuel pump which is compact and assures a stable operation, a cavity is formed in a pump body at a position where the pump body is in contact with a fuel discharge chamber. The cavity is arranged between outer and inner parts of the pump body and perpendicularly extends to a diaphragm. The pump body has a return path communicating with a fuel intake chamber and the cavity via opposite ends thereof. A pressure regulating mechanism is housed in the cavity using a cap attached to the pump body, and is positioned inside an outer diameter of a pump chamber. This prevents the pressure regulating chamber from projecting out of the pump chamber contrary to a pressure regulating chamber of the related art, and makes the fuel pump compact. A valve seat is formed in the cap which is separate from the pump body. This facilitates machining of the valve seat.

Abstract: A lubricating oil supplying device allows for the oil discharge amount to be more finely controlled by provision of many outlet ports, and by reducing the influence of vibration. Therefore, a spool valve unit and a pump are separately formed. The spool valve unit includes an open-close spool valve and a solenoid for controlling operation of this spool valve. Plural inlet passages and an outlet passage are formed in the spool valve. The spool valve opens or closes the inlet passages, and oil from the pump is introduced into these inlet passages. One side of the outlet passage communicates with the inlet passages, and the other side communicates with an engine. A passage for introducing the oil from an oil tank to a pump chamber is formed in the solenoid. When the solenoid is turned “OFF”, communication between the return passage and the inlet passages is interrupted by the spool valve, and the oil is discharged from the pump to the plural inlet passages.

Abstract: In order to provide a diaphragm type fuel pump which is compact and assures a stable operation, a cavity is formed in a pump body at a position where the pump body is in contact with a fuel discharge chamber. The cavity is arranged between outer and inner parts of the pump body and perpendicularly extends to a diaphragm. The pump body has a return path communicating with a fuel intake chamber and the cavity via opposite ends thereof. A pressure regulating mechanism is housed in the cavity using a cap attached to the pump body, and is positioned inside an outer diameter of a pump chamber. This prevents the pressure regulating chamber from projecting out of the pump chamber contrary to a pressure regulating chamber of the related art, and makes the fuel pump compact. A valve seat is formed in the cap which is separate from the pump body. This facilitates machining of the valve seat.

Abstract: A diaphragm 46 is sandwiched between a first body 16 and a second body 18, and comprises an outer diaphragm 50 which is made of synthetic resin and has an opening 48 formed within an effective diameter X, and an inner diaphragm 52 arranged in the opening 48. The outer and inner diaphragms 50 and 52 are hermetically sealed by a coupling member 54 made of rubber. Therefore, the diaphragm 46 reciprocates as a synthetic resin diaphragm at very low temperatures. At normal temperatures, the inner diaphragm 52 reciprocates extensively via the rubber coupling member 54 compared with the outer diaphragm 50, thereby increasing a flow rate of the fuel pump compared with a fuel pump in which a diaphragm is made only of synthetic resin. When the diaphragm 46 is replaced depending upon a desired flow rate, the second body 18 can be manufactured using one die, which is effective in reducing manufacturing costs.

Abstract: A pipe-fastening structure for an evaporation valve having a housing and a gas extraction path formed within the housing comprises a cylindrical connecting member, fixed to the housing, with first engaging portion and an inner space, a stopper member having a cylindrical inner member and second engaging portion engaging with the first engaging portion in two stages, a variable member, formed at part of the inner member in a cylindrical shape with a diameter capable of enlargement, channels formed at the inner wall of the variable member, a pipe for connecting evaporation valves and a large diameter bulge section formed in the vicinity of an end of the pipe. Locations of the inner member other than the variable member fit closely with the cylindrical inner wall of the connecting member and the first and second engaging portions undergo first stage engagement.

Abstract: A fuel pump which has excellent heat resistance and salt resistance, is low in cost and light in weight, and which is free from fuel leakage. The fuel pump has a bottom body formed of a thermosetting resin such as bakelite material which has heat resistance and strength, and a top body and a cover formed of a thermoplastic resin. The top body and the cover 16 are assembled with a seal member such as a gasket held between the top body and the cover, and the top body and the bottom body 12 are fixed together by a fixing element. Thereby, the main body portions of the fuel pump are constituted of resin.

Abstract: The invention provides a compact oil pump for separate lubrication having no back gear with the rotation of an engine as a driving source even when the engine is reversely rotated.

Abstract: An O-ring shaped annular rib (63) is disposed around the outer periphery of a flexible diaphragm member (62), and grooves (70, 71) are formed in first and second resin members (60, 61) for receiving the annular rib (63) in the compressed state. A hollow space is defined between the first and second members (60) for holding the diaphragm (62) in the clamped state. A contact surface (64) where the first and second synthetic resin members (60, 61) come into contact with each other, is located outward of the grooves (70, 71), and is subjected to welding with a supersonic welding tool (65). A gap (76) is formed between the first synthetic resin member (60) and the supersonic welding tool (65), which gap disappears as the welding progresses. At this time, further progress of the welding operation is inhibited by allowing the first synthetic resin member (60) and the supersonic welding tool (65) to provide a predetermined compression for the annular rib (63).

Abstract: A fuel cut device has a body in which a gas vent passage having a plurality of ports is formed. A connecting portion is formed around one of the ports in a laterally oriented manner for fixing a separate two-way valve onto the fuel cut device. A plurality of thus-configured fuel cut devices are mounted within a fuel tank. The fuel cut devices are mutually connected by means of pipes fitted into the corresponding ports. Unused ports are plugged. The two-way valve is connected to the connecting portion of the fuel cut device adapted to communicate with an external device. The pipes used to connect the fuel cut devices does not include a connection or a branch.