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US 4,294,482 AGranted
Railway wheel tread profile
AssigneeSouth African Inventions Development Corporation
InventorsHerbert Scheffel, Rowlen E. von Gericke, Joseph A. Viviers
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AssigneeSouth African Inventions Development Corporation
InventorsHerbert Scheffel, Rowlen E. von Gericke, Joseph A. Viviers
Estimating the term…
A profiled wheel tread for use with self-steering wheelsets, the tread having a running surface, a wheel flange, a taping line passing through the running surface, and a running zone between the taping line and the wheel flange. The invention provides that the effective conicity across the running zone being the rate of increase of rolling diameter decreases from the taping line towards the wheel flange. In another form the effective conicity initially increases from the taping line, reaches a maximum at a lateral deflection of between 1.5 and 4 mm, and then decreases towards the wheel flange. The wheel flange is thinner than normal to increase the gauge clearance. Improvements are thereby obtained in wheel tread wear and rail wear by minimizing creep forces; in hunting stability, because the effective conicity at maximum lateral deflection is low; and in steering ability, because of a high average conicity and increased gauge clearance.
A profiled wheel-tread for a railway wheel having a circumferential running surface and a circumferential wheel flange with the running surface having a taping line and a running zone between the taping line and a radiussed fillet portion at the base of the wheel flange with the improvement that the effective conicity across the running zone, the effective conicity being dependent on the rate of change of rolling diameter, decreases progressively while remaining positive from a zone adjacent the taping line towards the wheel flange.
A railway wheel having a circumferential running surface and a wheel flange with the running surface having a taping line and a running zone of wheel diameter increasing continuously towards the wheel flange between the taping line and a radiussed fillet zone merging the running zone with the wheel flange, the running zone in cross-section being a curve of smoothly merging arcs having their centres of curvature outside the wheel and having radii that increase in length progressively from a zone adjacent the taping line towards the flange.
A railway wheel having a circumferential tread, a radial wheel flange and a radiussed fillet merging the tread with the flange, the tread including a taping line denoting the tread contact point with a rail when the wheel as one of a pair of wheels on an axle is running in a central, neutral position on the rail, the diameter of the wheel increasing continuously in the region of the tread from the taping line to the fillet with the rate of increase of diameter decreasing towards the fillet.
Dependencies are inferred from the claim text.