Hitachi Construction Machinery Co., Ltd.

Mitsugu Ojima

Yasunori Ota

Shuji Egawa

Yuji Azuma

Hidetoshi Satake

Takenori Hiroki

Kouji Ishikawa

Shinji Kato

Toshihiko Ishida

Shinya Okumura

Toshihiko Watanabe

Nobuo Uzawa

There are provided an electric motor () that is driven by an engine () to generate electric power or assists in a drive of the engine () by supply of electric power thereto, a heat exchanger () to which cooling air is supplied by a cooling fan (A), a heat exchanger upstream room () that is positioned upstream of the heat exchanger () in a flow direction of the cooling air supplied to the heat exchanger (), and an electricity storage device () that stores or discharges electric power. In addition, a radiator () for electricity storage device, a cooling pump () for electricity storage device and a cooling line () for electricity storage device configure a cooling system () for electricity storage device that independently cools the electricity storage device () aside from the inverter device (), and the cooling system () for electricity storage device is arranged in the heat exchanger upstream room ().

Hybrid-type working machine

There are provided an electric motor () driven by an engine () to generate power or assists in driving the engine (), a heat exchanger () to which cooling air is supplied by a cooling fan (A), a heat exchanger upstream room () upstream of the heat exchanger (), an electricity storage device () that stores or discharges power, and an inverter device () for controlling an operation of the electric motor (). A radiator () for cooling the electricity storage device and a radiator () for cooling the are separately provided to be independent from each other, and are arranged in parallel between the heat exchanger () and the electricity storage device () in the heat exchanger upstream room ().

An assist generator motor is driven by an engine to generate power or assists in a drive of the engine by supply of power from an electricity storage device. A revolving electric motor is driven by power supplied from the electricity storage device or supplies regeneration power generated by a regeneration operation to the electricity storage device. The assist generator motor is controlled by a first inverter. The revolving electric motor is controlled by a second inverter. The first inverter and the second inverter are mounted on a support bracket elastically supported on a revolving frame in a position different from a position where the electricity storage device is mounted.

An electric motor that is fixed to a revolving frame, an electrical equipment that is supported by the revolving frame by using a vibration absorption mount, and a cable for establishing a connection between the electric motor and the electrical equipment are provided. A connector mounting member having an outer shape smaller than that of a box is provided in the box of the electrical equipment, and an equipment-side connector is provided in the connector mounting member. A cable-side connector of the cable is connected to the equipment-side connector, and a cable end portion of the cable is fixed to the box by a clamp member. As a result, the vibration that is transmitted to the cable can be matched with the vibration that is transmitted to the cable-side connector.

Construction machine

A reduction gear is mounted on a revolving frame, and an electric motor having an electric motor shaft is disposed on the reduction gear. A hydraulic motor having a shaft is disposed on an upper side of the electric motor. A shaft insertion hole through which an upper end side of the electric motor shaft is inserted is provided in a lid portion of an electric motor casing. A male spline portion provided on the hydraulic motor shaft is spline-coupled to a female spline portion provided on the electric motor shaft. A bearing is provided between the shaft insertion hole and the electric motor shaft, and a pressure tight seal is provided by being located upwardly of the bearing. Hence, spline coupling portions of the female spline portion and the male spline portion are constantly lubricated by making use of drain oil which has leaked from the hydraulic motor.

Swing device for construction machine

An electric work vehicle is provided in which the length of a high-tension cable connecting an electric motor included in a slewing motor with an inverter for controlling the electric motor can be set to be comparatively short. A region on a main frame is divided into three regions consisting of a center region, a first side region, and a second side region, via a first vertical rib and a second vertical rib. A slewing hydraulic motor and a slew assist electric motor, which constitute the slewing motor, are disposed in the center region, and an inverter for controlling the slew assist electric motor is disposed in a position near the second vertical rib in a second tool chamber provided in the second side region.

Electric work vehicle

A lock mechanism ( ) is constituted by a slide plate ( ) with a slot ( ) and a notched groove ( ), and a lock pin ( ) which is provided on the side of a console ( ). Through the slot ( ), the slide plate ( ) is slidably supported on a couple of support projections ( ) which are provided on the side of an operator's seat ( ). By engaging the notched groove ( ) with the lock pin ( ), the console ( ) is locked in an operating position. When an entrance gating lever ( ) is manipulated by an operator, the slide plate ( ) is pulled by a push-pull cable ( ) to slide in a rearward direction against the action of a tension spring ( ). Whereupon, the notched groove ( ) is disengaged from the lock pin ( ), and the console ( ) is swung back into an upturned position by the action of a gas spring ( ).

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Tsuchiura, Japan

Mitsugu Ojima