Railway rolling stock – Trucks – Axle bearing mounting
Patent
1998-04-22
2000-09-19
Morano, S. Joseph
Railway rolling stock
Trucks
Axle bearing mounting
105167, 10522405, 10522406, B61F 1500, B61F 526
Patent
active
061196029
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bogie truck axlebox suspension system for a railroad vehicle and particularly relates to an axlebox suspension system adapted to a truck which needs a steering function.
2. Prior Art
A conventional railroad vehicle is designed so that each pair of left and right wheels are fixed to a corresponding axle so as to rotate at equal rotational speeds. Further, in the conventional railroad vehicle, there are provided slopes called "wheel treads" at contact portions between the wheels and rails so that, when the wheels run on curved portions of the rails, a corresponding wheelset is displaced to the outside of the curve by the action of centrifugal force, or the like, to thereby cause a difference between the turning radii of inner and outer wheels to suppress the sliding of the inner and outer wheels on the rails to be in a fine range. Further, in the case of an acute curve in the railroad, enlargement of the distance between railroad tracks, which is called "slack", is provided so that the difference between the turning radii of the inner and outer wheels increases more greatly. Thus, as described above, the wheels per se have self-steering property. A conventional bogie truck is, however, characterized in that an axlebox suspension system with longitudinal stiffness is provided between a truck frame and an axlebox in order to prevent snaking from occurring at the time of high-speed running on a straight line portion. Further, in view of mechanism, the opposite ends of the axle are elastically fastened to the truck frame. As a result, in the case where the respective axles are to be directed to the center of the curve when the axles pass the curve in the railroad, force exceeding the elastic force of suspension is required to be transmitted. Therefore, a mechanism for connecting the axles and the truck frame through links is used, for example, as described in JP-A-5-77730.
Those systems become, however, so complex in structure as to bring increase in weight, production cost and maintenance cost in comparison with ordinary trucks. Accordingly, those systems are only used for a limited purpose of special express trains such as JR Hokkaido 283 railroad motor cars, or the like, requiring a high-speed operation.
An object of the present invention is therefore to provide an axlebox suspension system in which the aforementioned motion of the axles can be performed by paying attention to the characteristic of axles in that rotational displacement in a horizontal plane around the respective centers of gravity of the axles is made, while keeping the distance between the centers of the axles constant with respect to a truck frame in the case where the axles are turned toward the center of a curve in the railroad.
SUMMARY OF THE INVENTION
In order to achieve the above object, according to a first aspect of the present invention, there is provided by an axlebox suspension system in which each axle is contained within a perpendicular cylindrical surface with the center of gravity of a corresponding wheelset as its center with respect to a truck frame to thereby prevent the axle from moving longitudinally as a whole and allow the axle to displace in the direction of turning in a horizontal plane (hereinafter referred to as "in-horizontal-plane turning").
According to a second aspect of the present invention, a laminated rubber spring body having, as a guide, a part of a perpendicular cylinder with the center of gravity of the wheelset as its center is disposed between a truck frame and an axlebox to thereby make it possible to perform transmission of tractive force.
Incidentally, in this case, torsional stress acts on an axle spring portion. Another laminated rubber spring body formed in a corrugated section in the direction of in-horizontal-plane turning of the wheelset may be configured to be inserted in series to the axle spring to prevent the axle spring from being deformed excessively by the torsional stress.
According to a third
REFERENCES:
patent: 4561360 (1985-12-01), Mulcahy
patent: 4742779 (1988-05-01), Bevand
patent: 5174218 (1992-12-01), List
McCarry, Jr. Robert J.
Morano S. Joseph
Urban Culture Institute Co., Inc.
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