Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Riichi Nagao

Hiroaki Hashimoto

Shinji Yamazaki

Masanao Terada

Yu Hasegawa

Hajime Urai

Takashi Iida

Daisuke Ebisawa

Koichi Yamaka

Yoshihiro Yamaguchi

Itsurou Sawada

The present invention provides a shock absorber serving as a cylinder device capable of securing a clearance between an outer tube and a peripheral member and improving bending rigidity of the outer tube. An outer tubehousing an inner tubeis provided with a pair of knuckle bracket fastening platesandprotruding in one direction from an outer surface of the outer tube. The pair of knuckle bracket fastening platesandhas wide surfaces facing each other, and the wide surfaces are provided along an axial direction of the outer tube. When the inside of a vehicle is defined as a virtual region Iand the outside of the vehicle is defined as a virtual region IIwith a virtual line, which passes through a stroke center lineand matches the inside and outside of the vehicle, as a boundary in an orthogonal cross section at an arbitrary axial position of the outer tubeorthogonal to the stroke center lineof a piston rod, a cross-sectional area Aof the outer tubein the virtual region Iis made larger than a cross-sectional area Aof the outer tubein the virtual region II

Cylinder device

Provided is a rotary electric machine housing and a rotary electric machine equipped with the same. The housing allows the reduction of press fitting force required in each of two press fitting steps and has a high cooling effect. This rotary electric machine housing includes an internal cylinderallowing press fitting of a statoralong an inner diameter end of the internal cylinder. The internal cylinderhas an internal cylinder-side tapered face on its outer diameter end surface. The housing further includes an external cylinderhaving an external cylinder-side tapered face on an inner diameter end of the external cylinder. The external cylinder-side tapered face fits onto the internal cylinder-side tapered face. It is preferred that an inner diameter of the internal cylinder be smaller than an outer diameter of the stator; an outer diameter of the internal cylinder be larger than an inner diameter of the external cylinder; and a difference between the outer diameter of the internal cylinder and the inner diameter of the external cylinder be larger than a difference between the inner diameter of the internal cylinder and the outer diameter of the stator.

Rotary electric machine housing and rotary electric machine equipped therewith

A dynamo-electric machine reduces the increase in temperature of a stator close to a cooling liquid outlet and a stator end portion, and that has excellent cooling performance. The dynamo-electric machine is provided with: a stator, a rotor that is held on the inner-diameter-side of the stator across a predetermined gap so as to be capable of rotating; and a housing that is located on the outer-diameter-side of the stator and holds the stator and the rotor. The housing is provided with a cooling liquid channel through which a cooling liquid flows, the radial height of the cooling liquid channel within the housing differing depending on the axial position of the rotor.

Dynamo-electric machine

To provide a gas circuit breaker having a space-saving reliable double motion mechanism having a high degree of freedom in design. A double motion mechanism section of the gas circuit breaker is formed of a drive-side connecting rod, a driven-side connecting rod, levers connecting them and a guide regulating operations of the drive-side connecting rod and the driven-side connecting rod. A movable pin is connected to a first grooved cam formed in the drive-side connecting rod, a second grooved cam formed in the guide and third grooved cams formed in the levers respectively, and posture holding members are provided in the movable pin. The movable pin moves in the respective grooved cams by an operation of the drive-side connecting rod, thereby rotating the levers, driving the driven-side connecting rod in an opposite direction of the drive-side connecting rod, and driving the driven-side arcing contact in an opposite direction of the driven-side arcing contact.

Gas circuit breaker

To provide a gas circuit breaker having a space-saving and highly reliable double motion mechanism with high design freedom. In a double motion mechanism of the gas circuit breaker, a driven side movable pin is communicated with a lever driven side hole cut in the opposite side with respect to a rotation axis of a lever. A round hole through which a driving side movable pin is inserted and an elongate hole through which the driven side movable pin is inserted are cut in the outside of the lever. A position retaining member to suppress rotation of the driving side movable pin about two axes vertical to a pin axis is provided. The driving side movable pin is moved in respective grooved cams with an operation of the driving side rod, to rotate the lever, drive the driven side connecting rod in an opposite direction to the driving side connecting rod, and drive the driven side arcing contact in an opposite direction to the driving side arcing contact.

Growing community of inventors

Tokyo, Japan

Riichi Nagao