Truck for railcar
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsYoshi Sato, Masahiro Hamada, Junichi Sakamoto, Koichi Murata
Life of this patent
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Abstract
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.
Claims2
A truck for a railcar comprising at least three wheelsets in a truck frame of the truck, each of the wheelsets include an axle box that is supported by the truck frame through axle springs,
- the truck being configured such that spring constants of both-end axle springs, which are axle springs in the respective wheelsets located at both ends of the at least three wheelsets, are set to be larger than a spring constant of a middle axle spring, which is an axle spring of at least one wheelset other than those at the both ends, and the spring constants of both-end axle springs are set to be larger than the spring constant of the middle axle spring by an amount that is based on a spring stiffness in the spring action of a side frame of the truck frame.
A truck for a railcar comprising at least three wheelsets in a truck frame of the truck, each of the wheelsets includes an axle box that is supported by the truck frame through axle springs,
- the truck being configured such that the spring constants of both-end axle springs in the respective wheelsets located at both ends of the at least three wheelsets are set to be larger than a spring constant of a middle axle spring, which is an axle spring of at least one wheelset other than those at both ends, and
- assuming that the spring constant of the middle axle spring is k1, the spring constants of the both-end axle springs are k2, and the spring constant in the spring action of the truck frame with respect to a carbody load is kt, wherein the following relationship therebetween is established,
- k2=1/((1/k1)−(1/kt)).
Dependencies are inferred from the claim text.