Aisan Kogyo Kabushiki Kaisha

Kouichi Iwata

Katsuyoshi Fukaya

Hiroki Yamamoto

Takehide Nakamura

Kiyoshi Kato

A fuel pump assembly having a vapor by-pass port communicating a pump chamber with the interior of a fuel tank, which comprises a vapor introducing passage for introducing the vapor-mixed fuel discharged through the vapor by-pass port, a vapor discharge port communicating with the midway of the vapor introducing passage and opening to the interior of the fuel tank, and a bag-like closed space formed on a rear half portion of the vapor introducing passage. The vapor discharge noise is effectively reduced with the construction.

Fuel pump assembly having reduced vapor discharge noise

A flow control device wherein an operating shaft having two valve bodies is actuated by a single stepping motor to control the flow rate of fluid flowing through at least two by-pass passages. A portion of the operating shaft is supported by a first bearing member located in a boundary portion between a casing with the stepping motor incorporated therein and an air dispensing housing, and the shaft portion of the operating shaft located between the two valve bodies is supported by a second bearing member disposed in the interior of the housing. The two valve bodies are centrally provided with axial holes, through which is inserted the operating shaft to fix the valve bodies replaceably. The second bearing member is formed in the shape of a bottomed cylinder having a flange portion at a free end of the cylindrical portion, and at this flange portion the second bearing member is held between the casing and the housing together with the first bearing member. And a valve seat which controls the flow rate of air in cooperation with one of the two valve elements is supported replaceably by the cylindrical portion of the second bearing member.

Flow control device

A flow control device having a single valve body fixed to an operating shaft which is reciprocated by a single stepping motor to control the flow rate of air flowing two by-pass passages. Two air outlet ports and one air inlet port are formed in an air dispensing housing. Interior space of the housing is divided into two by-pass passages by a first valve seat. The valve body fixed to the operating shaft comprises a first valve portion for controlling the flow rate of air in cooperation with an opening formed in the first valve seat and a second valve portion for controlling the flow rate of air in cooperation with an opening of a second valve seat provided in the other air outlet port, the first and second valve portions being formed contiguously with each other.

A flow control device wherein a valve member is reciprocated linearly by the rotation of a rotor of a stepping motor to change the flow rate of air flowing through an air passage in a housing. To the rotor of the stepping motor is fixed a shaft having external threads. A guide member with a valve member fixed thereto has internal threads for threaded engagement with the external threads of the shaft and also has a stepped, axial bore for fixing the valve member. The valve member is fixed at a sleeve portion thereof to the stepped, axial bore of the guide member. An annular sliding bearing and a wave washer are inserted between the stepped portion of the axial bore of the guide member and an end face of the sleeve portion of the valve member. A small gap is formed between the inner wall of the axial bore of the guide member and the outer peripheral surface of the sliding bearing and also between the outer peripheral surface of the shaft and the inner peripheral surface of the sliding bearing, thereby permitting the sliding bearing to move radially and axially with respect to the shaft.

Growing community of inventors

Oobu, Japan

Kouichi Iwata