Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Construction Machinery Co., Ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Itsuro Sawada

Tadashi Osaka

Atsushi Yokoyama

Sachio Sekiya

Yuto Imanishi

Hiroyuki Sakamoto

Yasuyuki Saito

Kenichi Nakayama

Kenichiro Tokuo

Isao Hayase

Seiji Ishida

Satoshi Kikuchi

Masatsugu Arai

Hiroshi Hamano

Shingo Nasu

Tsutomu Miyoshi

Yuji Kano

Tomoaki Kaimori

Taisuke Ikeda

Shigenori Aoki

Makoto Ishijima

To uniformly cool down armature windings along the circumferential direction of a stator in a generator motor. A generator motor includes a statorfixed to the inner diameter side of a housing, a rotorrotatably supported by bearings, and armature windings wound around the teeth of a stator core. Each of bracketsprovided via the bearingshas a passagethrough which cooling oil flows and injection holeswhich communicate with the passage and inject cooling oil at positions opposite to winding ends of the armature windings. Cooling oil is injected toward the winding ends of the armature windings from the injection holesof the bracketsarranged on opposite axial sides of a shaft. In the flow rate distribution of the oil from the plurality of the injection holes, the flow rate of the oil from any of the injection holesis set to be greater as the position of the injection holeis higher above the level of the shaft. The arrangement pitch among the injection holesprovided on each of the bracketsis dense in a vertically upper portion of the bracket, and gradually sparser in a portion thereof closer to the level of shaft

Generator motor and electric vehicle using same

An electric rotating machine having high cooling performance is provided. The electric rotating machine is configured to include a rotor rotating around a rotational axis; and a stator disposed to face the circumferential surface of the rotor. The stator includes a stator core having a cylindrical core back and a plurality of teeth radially extending from the core back, and a stator coil wound around the teeth in concentrated winding via an insulation material. A spacer having electric insulation performance is attached between the stator coils each wound around the respective teeth adjacent to each other. The spacer has a coefficient of linear expansion greater than that of the stator core.

Electric rotating machine

A rotating electrical machine includes: a stator that includes a stator core and a stator coil; a rotor that rotates with respect to the stator; a refrigerant supply port through which a cooling medium is supplied to a coil end protruding from the stator core; and a guide member, disposed along at least a part of the coil end, for causing the cooling medium supplied through the refrigerant supply port to flow along the coil end.

Rotating electrical machine

A cooling system of an electric vehicle includes a cooling medium circulation path that circulates a cooling medium to an electrically powered drive unit of a vehicle, a heat exchange unit between the cooling medium and external air, a cooling medium circulation unit, a blower unit that blows air against the heat exchange unit, and a control unit that controls the cooling medium circulation unit and the blower unit, thus controlling cooling of the electrically powered drive unit. The control unit controls the cooling medium circulation unit and the blower unit in a first cooling mode, when a drive force for the vehicle is in a first operational region, and controls in a second cooling mode that provides a higher cooling capability than the first cooling mode, when the drive force for the vehicle is in a second operational region that is higher than the first operational region.

Cooling system of electric vehicle

An electric drive system for a vehicle includes: an electric drive unit that electrically drives the vehicle; and a cooling unit that cools the electric drive unit, wherein: the electric drive unit and the cooling unit are mounted at a body frame of the vehicle via an elastic support member, the electric drive unit and the cooling unit being configured as an integrated unit.

Electric drive system for vehicle

A vehicle air-conditioning apparatus, including: a refrigerant circulation channel that flows a refrigerant, the refrigerant circulation channel provided in a refrigeration cycle system including, as connected in a cyclic pattern, a compressor for the refrigerant, an outdoor heat-exchanger exchanging heat between the refrigerant and an outdoor air, an expansion valve reducing pressure of the refrigerant, and an air-conditioning heat-exchange circuit exchanging heat between the refrigerant and air to be introduced into a vehicle interior; and an equipment heat-exchange circuit connected in parallel to the circuit and exchanging heat between the refrigerant and in-vehicle equipment. The circuit includes a cooling heat-transfer medium circulation channel that circulates a heat-transfer medium for cooling. The cooling channel has a cooling heat-exchanger exchanging heat between the refrigerant in the channel and a cooling heat-transfer medium for cooling the in-vehicle equipment and a cooling circulation pump for circulating the cooling heat-transfer medium.

Vehicle air-conditioning apparatus

A linear actuator has an alternating drive apparatus, an alternating motion member, a fixing member fixed to a housing member, a direct acting member, a first wedge joining mechanism incorporated between the alternating motion member and the direct acting member, and a second wedge joining mechanism incorporated between the fixing member and the direct acting member. The first wedge joining mechanism and the second wedge joining mechanism have an inclined surface, a non-inclined surface at a constant distance from the central axis, and a wedge member arranged between the inclined surface and the non-inclined surface. The non-inclined surfaces of the first and second wedge joining mechanisms are formed on the direct acting member. The inclined surface of the first wedge joining mechanism is formed on the alternating motion member, and the inclined surface of the second wedge joining mechanism is formed to the fixing member.

Linear actuator

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Hitachinaka, Japan

Itsuro Sawada