Hitachi, Ltd.

Japanese National Railways

Japan National Railway

Isao Okamoto

Hideo Takai

Katsuyuki Terada

Michio Sebata

Hiroshi Higaki

Motomi Hiraishi

Hiromi Go

Kenjiro Kasai

Tetsuji Hirotsu

Toshihiko Sunaseki

Takao Shozi

Kastuyuki Terada

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

In a truck for a railway vehicle having a plurality of wheels-and-axles, an arrangement is provided for permitting each wheel-and-axle an optimal steering operation when the truck runs on a curved track, and to simplify the construction of journal box locator. Each journal box is located and fitted to a truck frame by the journal box locator for locating and fitting the journal box to the truck frame in such a fashion that the orbit of movement of the journal box expands upward with respect to the center axis of the truck, and permits the relative displacement between the journal box and the truck frame by elastic deformation of elastic members.

Truck for railway vehicle

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

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Musashino, Japan

Isao Okamoto