Aisin Seiki Kabushiki Kaisha

Masaki Chujo

Yasuo Ozawa

Atsushi Chiba

Junya Yamamoto

Itsuro Hashiguchi

Yojiro Koga

Toru Tamura

Shuhei Yamazaki

Takumi Hattori

Akihiro Katsumata

Kazuharu Jinnouchi

Yoshiaki Nakano

Takao Ozeki

A water pump includes a rotation member, a hollow shaft portion having an opening on one end and connected to the rotation member for unitary rotating with the rotation member, an impeller connected to the shaft portion for unitary rotating with the shaft portion, a body defining a fluid chamber in which the impeller is rotated, a bearing for rotatably supporting the shaft portion on the body, a sealing member provided between the shaft portion and the body for sealing the fluid chamber and a cover portion for substantively closing the opening of the shaft portion.

Water pump with a hollow shaft, seal, and drain opening therein

Water pump

A water pump apparatus includes a body adapted to a fixed mounting surface of an engine and having a bore, a rotational shaft rotatably supported on the body via a bearing, an impeller fixed to the shaft and located in a pump chamber for supplying forcibly water from a water inlet to a water outlet, a seal member for sealing between the pump chamber and the bore of the body and a collection chamber portion provided on at least one of the body or the engine so as to communicate with the bore between the bearing and the seal member via a drain passage and for collecting water leaked via the seal member, wherein the collection chamber portion is opened toward the mounting surface of the engine and an opening of the collection chamber portion is fluid-tight closed by fixing the body to the engine.

Water pump apparatus

To provide a water pump capable of preventing coolant leaked from a shaft sealing member from invading a bearing by a simple construction, a water pump has an outer ring of a bearing attached to an inner peripheral face of a pulley, an inner ring of the bearing attached to an outer peripheral face of a cylindrical portion of a housing and a shaft sealing member attached to an inner peripheral face of the cylindrical portion.

A supporting structure of bearings incorporates a housing, a shaft on which a rotor is fixed, a first ball bearing supported on the housing supporting one side of the shaft and having an outer and inner race, a second ball bearing supported on the housing supporting the other side of the shaft and having an outer and an inner race, an elastic member for urging the outer race of the second ball bearing in the axial direction, and a ring spacer having at least one radial projecting portion disposed between the elastic member and the outer race of the second ball bearing. The outer race and the inner race of the first ball bearing are fixed to the housing and the shaft. The outer race of the second ball bearing is slidably mounted to the housing, while the inner race of the second ball bearing is fixed to the shaft. The ring spacer also includes an axial groove formed on the housing for receiving the radial projecting portion whereby the radial projecting portion slides along the axial groove.

Supporting structure of bearings

A mechanical supercharger has a by-pass structure in the form of a valve body unitarily fixed to the supercharger housing at an end thereof opposite the drive gears for synchronously rotating the rotor shafts. The valve body contains a by-pass passage which is normally closed by a valve and which fluidically connects the outlet and the inlet of the compressor for permitting compressed gas to return to the inlet. The valve is slidably mounted on a shaft and is normally biased into the closed position by a spring, so that the valve will open the by-pass when the compressed gas pressure exceeds the spring force. The shaft itself is mounted to a diaphragm mechanism which can retract the shaft and open the valve in response to a pressure signal to the valve when supercharging is not necessary. Engine wear and fuel consumption are thus improved.

Mechanical supercharger system

A mechanical supercharger utilized in internal combustion engines includes a housing having an inlet port and an outlet port, and a bypass passage disposed in the housing for connecting the inlet port and the outlet port with each other. A relief valve is disposed in the bypass passage for releasing air pressure from the outlet port to the inlet port.

Growing community of inventors

Chiryu, Japan

Masaki Chujo