Taiho Kogyo Co., Ltd.

Kikuji Hayashida

Kiyotaka Ohtahara

Yoshinobu Kishi

Ryuichi Sakakibara

Yoshimasa Kuno

Naoto Noguchi

A vane pumphas a pump chamberA through an axial direction oil supply hole, a diameter direction oil supply holeand an axial direction oil supply grooveof an oil supply passage. A gas passagecontains a gas groovewhose one end is made to communicate with an outer space, the gas groovebeing formed on an outer peripheral surface of a shaft partB of a rotor, and the other end of this gas groove is made to intermittently overlappingly communicate with the axial direction oil supply grooveby a rotation of the rotor.

Vane pump having an oil supply passage communicating with a gas passage in the stopping state

A vane pump in which a lubricating oil from an oil supply pipeis supplied to a pump chamberA through an axial direction oil supply holeof an oil supply passage, a diameter direction oil supply hole, and an axial direction oil supply groove. A gas passageincludes a diameter direction gas holeand an axial direction gas groove, and the diameter direction gas holeis made to communicate with the axial direction gas groovewhen the diameter direction oil supply holeis made to communicate with the axial direction oil supply groove

Vane pump having a passage area ratio between an oil supply passage area and a gas passage area

An oil supply groove in communication with a pump room is formed above a bearing of a housing, and an open air groove in communication with atmospheric air is formed at a position rotated around the bearing by 90&#xb0; from the oil supply groove. In a shank of a rotor, a branch passage branching from an oil passage formed in its axial direction to the diametrical direction of the shank and an open air passage formed in the direction perpendicular to the branch passage are formed. The branch passage and the oil supply groove communicate with each other while the open air passage and the open air groove are arranged to also communicate with each other.

Vane pump with circulating oil supply passage

A vane type vacuum pumpis provided in the vicinity of an air intake passagefor sucking the air into a pump chamber, and communicates a space A on the front side and a space B on the back side of the rotational direction of the vane at the time of the reverse rotation of the vane, and includes an escaping groovefor allowing a lubricating oil to escape into the space B on the back side from the space A on the front side.

Vane type vacuum pump

An oil supply groovein communication with a pump roomA is formed above a bearingB of a housing, and an open air groovein communication with an atmospheric air is formed at a position rotated around the bearingB by 90&#xb0; from the oil supply groove. In a shankB of a rotor, a branch passagebranching from an oil passageformed in its axial direction to the diametrical direction of the shank, and an open air passageformed in the direction perpendicular to the branch passage are formed. Then, the branch passage and the oil supply groove communicate with each other, at the same time, the open air passage and the open air groove are arranged to also communicate with each other, and when the oil passage and the oil supply groove communicate with each other as the rotor stops, then an atmospheric air flowing in from the open air passage eliminates a negative pressure in the pump room, thereby the lubricating oil is prevented from flowing into the pump room in large quantities. An amount of the lubricating oil flowing into pump room at stop of the rotor can be reduced to prevent the vane from being damaged and an amount of the lubricating oil consumed due to rotation of the rotor can be controlled.

Vane pump

A vane pump comprising a housing, a rotor and a vane is provided. The housing comprises a pump room having an approximately circular inner wall. The rotor rotates at an eccentric position relative to a center of the pump room and slides in contact with a part of the inner wall of the pump room. The vane is rotated by the rotor, for dividing the pump room into a plurality of spaces full-time. In the housing, among spaces divided by a center line drawn between the center of the pump room and a center of rotation of the rotor, an intake passage in one space and an exhaust passage in the other space are formed, respectively. An oil supply passage is formed in the rotor and the housing. A lubricating oil is intermittently fed through a communicating hole of the oil supply passage.

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Toyota, Japan

Kikuji Hayashida