Hitachi, Ltd.

Japanese National Railways

Kasado Kikai Co., Ltd.

Japan National Railway

Katsuyuki Terada

Hideo Takai

Michio Sebata

Kenji Kobayashi

Yutaka Kakehi

Morishige Hattori

Toshiaki Makino

Yasushi Takano

Akiyoshi Iida

Kenjiro Kasai

Masabumi Oshima

Isao Okamoto

Toshi Yasui

Chisachi Katoo

Michifumi Takeichi

Hiroshi Higaki

Hisashi Tani

Hiromi Go

Sumio Okuno

Toru Saito

Motomi Hiraishi

Takeyuki Watanabe

Keiichiro Torii

Kenjirou Kasai

Tadashi Beppu

Masayuki Dogen

Fumio Iwasaki

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 rolling-stock underframe construction comprising longitudinal side sills, end sills connecting opposite longitudinal ends of one side sills to opposite longitudinal ends of the other side sill, body bolsters respectively disposed at positions corresponding to trucks, and center sills extending between the end sills and the corresponding body bolsters in parallel to the side sills; and a floor member fixedly disposed in an area defined by the side sills and the end sills. The floor member comprises an upper plate forming, a lower plate forming, and a corrugated plate disposed between the upper plate and lower plate. The corrugated plate includes an alternate arrangement of ridges and longitudinal furrows and is joined to both the upper and lower plate. The floor member has weight and thickness smaller than those to join the floor member side sills, and body bolsters, an assembly of the corrugated and the upper plate or lower plate is joined to the side sills and the body bolsters, and then the lower or upper plate is joined to the corrugated plate, the side sills and the body bolsters, so that the floor member is joined firmly to the side sills and the body bolsters.

Construction and a manufacturing method of underframe for a rolling stock

The workability during fabrication of an underfloor construction of a monorail vehicle is improved by reducing the steps of fabrication. An underfloor construction of a monorail vehicle comprises truck enclosures detachably mounted at positions where trucks are mounted in the undersurface of the underframe to enclose the periphery of the trucks, and an enclosure for underfloor equipment for enclosing the sides and lower surface of the underfloor equipment. A method of assembling an underfloor construction of a monorail vehicle comprises mounting a wiring duct and underfloor equipment on the undersurface of an underframe, conducting wiring work between the wiring duct and the underfloor equipment, and thereafter mounting an enclosure for underfloor equipment.

Underfloor construction of monorail vehicle and method of assembling the

A wheelset steering apparatus and method for the truck of railway vehicles, wherein an axle box rotatably provided on the opposite ends of the wheelset is elastically supported in the longitudinal direction as well as in the lateral direction of the truck with respect to a truck frame. Vertical loadings on the truck frame are carried by the axle box. A spring constant in the longitudinal direction of the truck in a state of being elastically supported with respect to the truck frame of the axle box is varied when the vehicle runs. The self-steering property of the wheelset is enhanced, and stability in running on a straight track is secured.

Wheelset steering apparatus and method for the truck of railway vehicles

A vibration control apparatus for vehicles to be installed on the vehicle wherein a vehicle body is supported on a truck through springs and damping mechanisms, for suppressing the vibrations of the vehicle body and enhancing the riding quality of the vehicle, comprising a vibration detector which detects the vibration of the vehicle body, a compensator circuit which compensates the detection output of the vibration detector and produces a control output for suppressing the vibration of the vehicle body, a fluid operating mechanism which controls the relative displacement between the vehicle body and the truck and which is connected to the vehicle body on one side and to the truck on the other side, a fluid control device which controls the fluid operating mechanism by the use of the control output produced by the compensator circuit, and damping control means to suppress the damping function of the damping mechanism upon sensing the state under which the vibration of the vehicle body is suppressed by the fluid operating mechanism.

Vibration control apparatus for vehicles

This invention relates to a superior suppressing of vibration in a car body when a vehicle runs on a straight railroad and a curvilinear railroad. The invention is comprised of a fluid pressure-acting mechanism arranged between the car body and the truck along with springs for positively controlling a force acting between the car body and the truck with the supplied pressure fluid, an acceleration detector for detecting an acceleration of the car body, and means for determining a displacement generated relatively between the car body and the truck under a steady acceleration acting against the car body. The invention further comprises a controller for receiving a vibration suppressing control signal as a control input representing a result of detection of the acceleration detector, and for receiving a value corresponding to a relative displacement between the car body and the truck contained in the vibration suppressing control signal as a result of the determination from the means for determining a relative displacement between the car body and the truck. The controller subtracts this value from the vibration suppressing controlling signal and outputs it as a control signal. The invention further includes a fluid control unit for controlling a fluid pressure to be supplied to the fluid pressure-acting mechanism with a control signal output by the controller, wherein vibration caused by a relative displacement generated between the car body and the truck with a steady acceleration acting against the car body can be presented to improve driving comfort.

Apparatus for controlling vibration of vehicle

A vehicle tilt control apparatus has an acceleration detector for detecting vibration in horizontal and lateral direction of a car body, a fluidically operating mechanism disposed between the car body and a truck and compensation circuits for compensating a centrifugal force component and a jolting component, respectively, of the output of the acceleration detector. The outputs of the compensation circuits are added and the resulting output is fed back to actuate a servo valve to control the fluidically operating mechanism. In this manner, the riding comfort to the passengers when the vehicle passes through a curved area and for the jolting is improved.

Vehicle tilt control apparatus

Vehicle body vibration control apparatus

An earthquake-resistant crane including a plurality of girders supported on wheels for movement along rails includes a vertical vibration damping device to ensure safe operation of the crane. The vertical vibration damping device includes a resilient support for supporting the girders in a vertical direction, a vibration direction converting arrangement mounted between the girders and the wheels for converting vertical vibrations of the girders to a horizontal displacement of the wheels, and drive control device connected to the wheels. The vertical vibration damping device operates such that the vertical vibrations of the girders are converted to a horizontal displacement of the wheels to dissipate the energy of vibrations by the sliding friction produced between the wheels and the rails when the wheels move in the horizontal direction, whereby the amplitude of vibrations produced in response to the vertical vibrations of the girders can be reduced.

Earthquake resistant crane

Growing community of inventors

Kudamatsu, Japan

Katsuyuki Terada