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An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.
Centerlock wheels and hubs continued to be used for racing cars, although the mechanical details of the design gradually changed from the original Rudge-Whitworth pattern. Formula One , sports car racing , NASCAR (Cup Series seventh-generation car, from 2022 onwards) and many other types of racing use a form of centerlock hub.
A rail vehicle wheelset, comprising two wheels mounted rigidly on an axle A wheelset is a pair of railroad vehicle wheels mounted rigidly on an axle allowing both wheels to rotate together. Wheelsets are often mounted in a bogie (" truck " in North America ) – a pivoted frame assembly holding at least two wheelsets – at each end of the vehicle.
SSR Wheels (formerly known as Speed Star Racing Wheels) is a Japanese wheel manufacturer for both motorsport and aftermarket applications, headquartered in Osaka, Japan. The company is often credited as being the first to ever make a three-piece wheel with their MK-I wheel in 1971, and remains one of the most notable Japanese producers of ...
The width is the inside distance between the bead seat faces. The offset is the distance from the wheel's true centerline (half the width) to the wheel's mounting surface. Offset is covered in more detail below. A typical wheel size will be listed beginning with the diameter, then the width, and lastly the offset (+ or - for positive or negative).
The minimum railway curve radius is the shortest allowable design radius for the centerline of railway tracks under a particular set of conditions. It has an important bearing on construction costs and operating costs and, in combination with superelevation (difference in elevation of the two rails) in the case of train tracks , determines the ...