Patent ID: 9321305
Filing Date: 2016-04-26
CPC Classification: B60B,Y02T

Claim Text:
1. A railway wheel having a central plane perpendicular to an axis of rotation of the wheel which includes a rim formed by a tread surface and a flange, and also includes a hub and a web formed by external and internal surfaces and made in such a way that a theoretical midline of a transverse web profile passes through a first point located in a place of matching the web with the rim, a central point where the theoretical midline has maximum offset from the central plane in a direction opposite to the flange, and a second point located in a place of matching the web with the hub, wherein an external surface of the web is formed on a rim side by a first external radius curve and on a hub side by a second external radius curve with a curvature that coincides in a direction with the curvature of the first external radius curve, said curves matching each other in a central part of the web by a third, on the rim side, and a fourth, on the hub side, external radius curves with a curvature opposite in the direction to the curvature of the first and second external radius curves, while an internal surface of the web is formed on the rim side by a first internal radius curve and on the hub side by a second internal radius curve with a curvature that coincides to the direction with the curvature of the first internal radius curve, said curves matching each other in the central part of the web by the third, on the rim side, and the fourth, on the hub side, internal radius curves with the curvature opposite in the direction to the curvature of the first and the second internal radius curves, said railway wheel being characterized in that radiuses of the first and the second external radius curves for the external web surface are from 0.04 to 0.05 of a tread diameter, the radius of the third external radius curve is from 0.08 to 0.1 of the tread diameter, the radius of the fourth external radius curve is from 0.07 to 0.09 of the tread diameter, and the radius of the first internal radius curve for the internal web surface is from 0.08 to 0.1 of the tread diameter, radiuses of the second and the third internal radius curves are from 0.06 to 0.08 of the tread diameter, the radius of the fourth internal radius curve is from 0.04 to 0.06 of the tread diameter, wherein the first point is offset to a distance not more than 0.08 of the rim width from the central plane in the direction opposite to the flange, the central point is offset from the central plane to a distance within a range of values from 0.35 to 0.4 of the rim width, and the second point is offset to a distance not more than 0.1 of the rim width from the central plane towards the flange, while the ratio of a web thickness at the first point to a web thickness at the second point is from 0.7 to 1.1 and a ratio of a web thickness at the central point to the web thickness at the second point is from 0.7 to 0.9.