Aisin Seiki Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Masahiro Fukuta

Kunihito Sato

Toshio Onuma

Koichiro Hirosawa

Hiroyuki Ikemoto

Tsukasa Watanabe

Osamu Komazawa

Toshiaki Okamoto

Takashi Ohmitsu

Shinji Matsuda

A rotor device includes a casing, an outer rotor positioned in the casing and rotatable about a first rotational axis, and an inner rotor positioned in the casing and rotatable about a second rotational axis. An outer sealing portion of the inner rotor defines a locus along an inner wall surface of an operating chamber of the outer rotor as a result of the rotation of the inner rotor. An inner sealing portion of the outer rotor defines a locus along an outer circumferential surface of the inner rotor in response to the rotation of the outer rotor. The inner wall surface of the operating chamber engages the outer circumferential surface of the inner rotor through a gear engagement. A driving input shaft portion is connected to the outer rotor and a first gear having teeth on its inner circumferential surface is connected to the outer rotor. A second gear having teeth on its outer circumferential surface is connected to the inner rotor and is engaged with the first gear, whereby the inner rotor is driven by the outer rotor via the first and second gears.

Rotor device having inner rotor and driven outer rotor

A pressure control valve delivers a pressure which is proportional to a current level chosen to energize a solenoid therein to a shock absorber of a suspension. A spool in the valve has an annular groove for communicating an output port to a high pressure port or a low pressure port selectively. There are conical surfaces or inclined surfaces at edges of lands adjacent to the groove, which incline from annular surfaces of the lands toward the bottom of the groove. The inclined surfaces slow down a change of the flow rate from the high pressure port to the output port and from the output port to the low pressure port when the annular groove communicates with the high pressure port and the low pressure port respectively.

Pressure control valve device

A Roots type blower is disclosed having rotors with twisted-shape and projections on the pitch circle. The blower is compact in the axial direction, because the projections work as gearing between the rotors. Therefor, it is not necessary to provide additional gears for driving the rotors. Each of the rotors has a twisted-shape with a relationship of n.times..theta..gtoreq.2.pi., where n is the number of leaves and .theta. is the lead angle.

Roots type blower

Growing community of inventors

Nagoya, Japan

Masahiro Fukuta