Hitachi, Ltd.

Akiyoshi Iida

Kenji Kobayashi

Morishige Hattori

Yasushi Takano

Toshiaki Makino

Katsuyuki Terada

Hideo Takai

Michio Sebata

Masabumi Oshima

Toshi Yasui

Chisachi Katoo

Hiroshi Yamada

Hitoshi Matsushima

Yoshihiro Kondo

Toshio Hatada

Hiroshi Ito

Kenta Kumagai

Susumu Iwai

Shinichi Shimode

Masahiro Ikegawa

Kazuo Morita

Syuya Hagiwara

Toshihiro Komatsu

Shouhei Fuse

Tetsuro Homma

An air-cooled information processing apparatus has a plurality of units and a casing accommodating the units. At least one cooling air supply section and at least one cooling air discharge section are provided in the casing, for supplying cooling air into the apparatus and for discharging the air therefrom. A partition member divides the space inside the casing so as to define at least two cooling air flow channels between the cooling air supply section and the cooling air discharge section. At least one main fan unit is disposed in each of the cooling air flow channels. The cooling air flow channels include at least one first cooling air flow channel in which at least two units from among the plurality of units are disposed in parallel with each other with respect to the direction of flow of cooling air, and at least one second cooling air flow channel in which at least two units from among the plurality of units are arranged in series to each other along the flow of cooling air. This cooling arrangement ensures optimum cooling for different types of units in the apparatus, without being accompanied by rise in the noise level, rate of discharge of air, power consumption and production cost.

Air-cooled information processing apparatus having cooling air fan,

A low noise current collector 20 having excellent controllability and response, and a high speed railway train using such current collectors. The current collector 20 includes an aerodynamically shaped current collector head 22, a driving cylinder 32 to move the current collecting head, a supporting insulator 30, and a cable head 50 supporting a conductor 53 for conducting current from current collecting head 22 to a load. The current collector 20 is controlled by a cylinder 7 for raising and lowering so that the current collector may be contained in a dome 4 when it is in use. A multi-car train has four current collectors, two toward each end, and each current collector has its front side directed toward the center of the train. The two current collectors at the rear of the train are utilized, while the two at the front are contained within their domes 4. Therefore, the train can run in either direction, utilizing the appropriate pair of current collectors.

High speed low noise current collecting equipment and method on

A current collector for a railway trolley vehicle includes a current collecting member having a contact strip, a driving system for moving the current collecting member into and out of contact with a trolley wire, a load cell for detecting force acting between the current collecting member and the driving system, a displacement meter for detecting displacement of the driving system, first and second estimating circuits, and a control circuit. The first estimating circuit provides an estimated value of the contact force between the current collector and the trolley wire by estimating values of first parameters of the contact strip, the current collecting member, and the trolley wire and summing products of each of these values and a corresponding weighting factor. The second estimating circuit provides an estimated value of a disturbance suppressing force by estimating values of second parameters of the contact strip, the current collecting member, and the trolley wire and summing products of each of these values and a corresponding weighting factor. The control circuit calculates a difference force value by subtracting the estimated contact force value and the estimated disturbance suppressing force value from a contact force target value. The control circuit then adjusts a pushing-up force of the driving system on the basis of the calculated force difference value.

The invention relates to a current collector for an electrically powered vehicle. The collector includes a current collecting member which collects current from a current supplying body and conducts the current to a load in the vehicle. The current collecting member is coupled to a driving system through a first insulating element. The driving system moves the current collecting member to the current supplying body. A sensor for controlling the driving system is positioned between the driving system and the insulating element.

A current collecting apparatus provided with sliders 2 for collecting electric power from a power feeder 1, a current collector 3 for collecting power, an insulator for insulating and supporting the current collector 3, and a flexible conductor for delivering the power collected by the current collector 3 to a conductor 5, which is connected to the flexible conductor and used for supplying the power to the vehicle side. The conductor 5 and the insulator 4 are disposed so that the former is offset with respect to the latter in the crosswise direction of a railway vehicle. With this arrangement, aerodynamic noise emanating from the current collector loaded on the vehicle running at high speed can be substantially reduced.

Current collecting apparatus

Growing community of inventors

Mitsukaido, Japan

Akiyoshi Iida