Kawasaki Jukogyo Kabushiki Kaisha

Sumitomo Electric Industries, Limited

Koichi Murata

Yoshi Sato

Yukitaka Taga

Takehiro Nishimura

Keiichiro Kamura

Yuta Yoshimatsu

Fumikazu Kounoike

Yousuke Tsumura

Francois Olivier Uchida

Junichi Shirakawa

Kazuo Isomura

Makoto Tamaki

Shunichi Nakao

Hirohide Matsushima

Takayuki Sawa

Junichi Sakamoto

Hirokazu Haraguchi

Takafumi Okamoto

Masahiro Hamada

A wheel load adjusting apparatus used in a railcar, and the railcar includes: first and second air springs arranged between a carbody and a first bogie so as to be spaced apart from each other in a car width direction; third and fourth air springs arranged between the carbody and a second bogie so as to be spaced apart from each other in the car width direction; and first to fourth automatic level controlling valves provided upstream of the first four air springs and configured to adjust heights of the four air springs to maintain constant height of the air springs, wherein when the railcar passes through a curve, the wheel load adjusting apparatus limits an air supply/air discharge operation of at least one of the four automatic level controlling valves to suppress an increase in a pressure difference between at least two of the four air springs.

Wheel load adjusting apparatus of railcar

A railcar steering bogie includes a bogie frame, a wheelset, an axle box suspension, a steering mechanism configured to steer the wheelset, a brake unit, and a brake unit support link. The brake unit includes: a main body frame; a brake shoe supported by the main body frame and pressed against a wheel tread of the wheel during braking. The brake unit support link couples the axle box suspension and the brake unit and transmits displacement of the axle box in a car longitudinal direction to the brake unit at least during steering performed by the steering mechanism. The brake unit support link restricts the brake unit from being displaced outward in a car width direction by a predetermined distance or more during the braking. At least one of a side surface of the brake unit support link and a side surface of the brake unit includes a sliding surface.

Railcar steering bogie including brake unit

A railcar steering bogie includes: a bogie frame including a cross beam; pair of axles; axle boxes accommodating bearings; axle box suspensions each including a coupling member coupling the corresponding axle box and bogie frame while allowing relative displacement in a car longitudinal direction; plate spring extending in the car longitudinal direction and including car longitudinal direction end portions extending obliquely upward along the car longitudinal direction and supported above the respective axle boxes and a car longitudinal direction middle portion unfixedly arranged under the cross beam; support seats including respective inclined upper surfaces and supporting the both respective longitudinal direction end portions of the plate spring; and gap bodies each provided between an upper surface of the corresponding axle box suspension and a lower surface of the corresponding support seat and configured to allow displacement of the axle box suspension and the support seat in the car longitudinal direction.

Railcar steering bogie

A railcar steering bogie includes: a bogie frame supporting a bolster such that the bolster is swingable relative to bogie frame about a vertical axis; two wheelsets; axle box suspensions including respective axle beams coupling corresponding axle boxes to bogie frame, the axle boxes accommodating respective bearings supporting corresponding axles; and a steering mechanism steering at least one of the two wheelsets in accordance with the bolster's swinging relative to the bogie frame. The steering mechanism includes: a steering lever configured to turn relative to the bogie frame about fulcrum axis; a coupling link coupling the bolster and steering lever and configured to operate in conjunction with the bolster's swinging relative to the bogie frame; and at least one steering link coupling steering lever and axle beam and configured to steer the corresponding wheelset by displacing corresponding axle box through the corresponding axle beam in conjunction with steering lever's turning.

A railcar steering bogie includes: a bogie frame supporting a bolster such that the bolster is swingable relative to the bogie frame about a vertical axis; two wheelsets each including an axle and a pair of wheels; and a steering mechanism configured to steer at least one of the two wheelsets in accordance with the swinging of the bolster relative to the bogie frame. The steering mechanism includes: a steering lever configured to turn relative to the bogie frame about a fulcrum axis; a coupling link coupling the bolster and the steering lever and configured to operate in conjunction with the swinging of the bolster relative to the bogie frame; and a steering link coupled to the steering lever and configured to steer the wheelset in conjunction with the turning of the steering lever. The steering link is coupled to the steering lever by a pin member.

An axle box suspension includes: an axle beam including an axle beam main body portion extending from the axle box in a car longitudinal direction and a pin portion projecting from a tip end of the axle beam main body portion in the car longitudinal direction; a tubular elastic bushing including an inner tube portion, an outer tube portion, and an elastic portion interposed between the inner tube portion and the outer tube portion, the inner tube portion being fitted to the pin portion; an adapter attached to the outer tube portion and coupling the axle beam and the bogie frame; and a first stopper attached to the pin portion and configured to, when the axle box is displaced relative to the bogie frame toward one side in the car longitudinal direction by a predetermined distance, contact the adapter to restrict displacement of the axle box.

Axle box suspension of railcar bogie

A carbody support device of a railway vehicle, including support mechanisms installed between a front bogie and a carbody and between a rear bogie and the carbody in a traveling direction, and supporting the carbody against the respective bogies. The support mechanisms regulate both the front bogie and the rear bogie inclining in the same vehicle width direction with respect to the carbody when the railway vehicle travels through a curve, while the support mechanisms permit the front bogie and the rear bogie inclining in different vehicle width directions.

Carbody support device and railway vehicle

There is provided a three-axle truck for a railcar having three wheelsets in a truck frame of the one truck, in which in each of the wheelsets, axle boxes are supported by the truck frame through axle springs, the truck frame has a structure for supporting a carbody whose weight is variable, and making variations in axle loads on the respective wheelsets be maintained at a preset value or less in spite of change of the carbody weight, and in this structure, spring constants of the both-end axle springs in the respective wheelsets located at both ends of three axles are set to be larger than a spring constant of the middle axle spring of the wheelset located in the middle.

Truck for railcar

A railcar bogie includes: a bolster located under a carbody of a railcar; an air spring including an air spring main body in which air is stored, the air spring being arranged between the carbody and the bolster; a coil spring arranged between the air spring and the bolster and configured to separate the air spring from the bolster by restoring force thereof in a state where a height of the carbody is maintained at a certain height regardless of the air spring; and a limiting member configured to limit the amount of displacement of the coil spring to limit the amount of separation between the air spring and the bolster.

Growing community of inventors

Kobe, Japan

Koichi Murata