A component fastening structure has a first component and a second component connected by a bolt and a nut. The first component includes a through hole through which a bolt is inserted, a seating face on which the bolt head is mounted near an upper end opening of the through hole, two rotation preventing wall portions which are formed near the seating face at both sides of the head to position the head between them, and lifting suppressing portions which are formed at positions apart above the seating face on the individual rotation preventing wall portions and protruded toward the head side. The interval between the two rotation preventing wall portions is smaller than the distance between the tip ends of two arm parts formed on the bolt head, and the seating face sides of the lifting suppressing portions are opposed to the upper surfaces of the arm parts.

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.

An axle box suspension positioning device for a railway vehicle is provided, which includes a guide column assembly. The guide column assembly includes a fixed end connected to a frame of the railway vehicle, and a free end which is extendable and retractable from an opening of the axle box. An elastic positioning component is provided in the opening, and the elastic positioning component limits a movement of the free end along a running direction of the vehicle with respect to the frame. The arrangement of the elastic positioning component enables the axle box suspension positioning device to have a large positioning rigidity. A bogie having the axle box suspension positioning device is also provided.

A bolster system and method of balancing a locomotive on a bolster system is provided. The bolster system is configured such that weld seams interconnect the locomotive to the bolster, and the weld seams are oriented such that when the truck or locomotive impacts another device on the rail track, the weld seams experience a shearing force along the lengths of the weld seams. In addition, prior to welding, scales such as hydraulic jacks with gauges may be used to center and balance a locomotive on a bolster. In one embodiment, four hydraulic jacks elevate the truck, bolster, and locomotive, and the locomotive is repositioned on the bolster until the hydraulic jacks have substantially similar measures.

The present invention provides a variable stiffness positioning device for a railway vehicle bogie axle box. The variable stiffness positioning device includes a vertical elastomer arranged between the top face of an axle box bearing saddle and the bottom surface of a guide frame of a side fame, and a longitudinal elastomer arranged between the axle box bearing saddle and the front and back side faces of the guide frame of the side fame, the longitudinal elastomer is provided with at least one small-stiffness elastic element and a large-stiffness elastic element, and the small-stiffness elastic element is arranged in an elastomer pre-compression device and is serially arranged with the large-stiffness elastic element under the action of a pre-compression load F1. The longitudinal elastomer has a larger longitudinal compression stiffness when the longitudinal deformation displacement is very small, so that the railway vehicle can be guaranteed to have a higher snaking critical operation speed when operating on a straight line, and the acceleration operation demand of the vehicle is satisfied; when the longitudinal deformation displacement reaches a set numerical value, the longitudinal compression stiffness of the longitudinal elastomer starts to become small, so that when the railway vehicle passes by a curve, it can be guaranteed that the lateral force between wheel rails will not be too large, and thus the curve operation safety of the vehicle is guaranteed.

The present invention provides a variable stiffness positioning device for a railway vehicle bogie axle box. The variable stiffness positioning device includes a vertical elastomer arranged between the top face of an axle box bearing saddle and the bottom surface of a guide frame of a side fame, and a longitudinal elastomer arranged between the axle box bearing saddle and the front and back side faces of the guide frame of the side fame, the longitudinal elastomer is provided with at least one small-stiffness elastic element and a large-stiffness elastic element, and the small-stiffness elastic element is arranged in an elastomer pre-compression device and is serially arranged with the large-stiffness elastic element under the action of a pre-compression load F1. The longitudinal elastomer has a larger longitudinal compression stiffness when the longitudinal deformation displacement is very small, so that the railway vehicle can be guaranteed to have a higher snaking critical operation speed when operating on a straight line, and the acceleration operation demand of the vehicle is satisfied; when the longitudinal deformation displacement reaches a set numerical value, the longitudinal compression stiffness of the longitudinal elastomer starts to become small, so that when the railway vehicle passes by a curve, it can be guaranteed that the lateral force between wheel rails will not be too large, and thus the curve operation safety of the vehicle is guaranteed.

The electric vehicle can include: a payload interface, a payload suspension, a chassis, a set of bumpers, a sensor suite, a controller, a chassis suspension, and an electric powertrain. The electric vehicle 100 can optionally include a payload adapter, a power source, a cooling subsystem, and/or any other suitable components. The electric vehicle functions to structurally support a payload, such as a cargo container (e.g., intermodal container, ISO container, etc.), and/or to facilitate transportation of a payload via railway infrastructure.

The electric vehicle can include: a payload interface, a payload suspension, a chassis, a set of bumpers, a sensor suite, a controller, a chassis suspension, and an electric powertrain. The electric vehicle 100 can optionally include a payload adapter, a power source, a cooling subsystem, and/or any other suitable components. The electric vehicle functions to structurally support a payload, such as a cargo container (e.g., intermodal container, ISO container, etc.), and/or to facilitate transportation of a payload via railway infrastructure.

A traction rod assembly for a bogie system includes a body extending between first and second ends. A bush assembly is coupled with the first end and includes a first component having a passage, and a second component disposed within the passage of the first component. The bush assembly includes an eccentric offset such that a center of the first component is offset from a center of the second component. A bearing assembly is coupled with the second end of the body and includes cylindrical bearings and spacers that are concentric with a passage disposed at the second end of the body. The bush assembly is coupled with a frame of the bogie system and the bearing assembly is operably with an axle assembly of the bogie system. The bearing assembly allows rotation of the body relative to the axle assembly of the bogie system.

A railroad car truck including one or two new side frames that each includes one or more of a plurality of different improvements that individually and in various combinations reduce, inhibit, or minimize the likelihood of stress fractures or cracks in the side frame.