Heat treatment method for rolling bearing device for wheel and cooling device for inner shaft

Abstract

In the heat treating method, a raceway surface of an outer ring is subjected to heat treatment, while an entirety of an outer peripheral face of the outer ring is cooled by injecting water. Moreover, a raceway surface of an inner shaft is subjected to heat treatment, while a flange of the inner shaft is cooled by bringing it into contact with water. The cooling unit has a holding part for holding the flange while the flange is in contact with water.

Description

Technical field [0001] The present invention relates to a heat treatment method of a rail surface of a rolling bearing device for a wheel and a cooling unit for an inner shaft used in the heat treatment method. The rolling bearing device for a wheel is used to rotatably hold on a suspension device of an automobile or the like wheel. Background technique [0002] figure 1 It is a cross-sectional view showing an example of a rolling bearing device 1 for a wheel that has been widely used in recent years. reference figure 1 In this example, the rolling bearing device 1 for a wheel includes an outer ring 2 having the shape of a tube; an inner shaft 3 in which the inner shaft 3 is inserted into the tube and arranged coaxially with the outer ring 2; and The rolling elements 4 are arranged between the outer ring 2 and the inner shaft 3. [0003] Double rows (two rows in the figure) track surfaces 5 and 6 for holding the rolling elements 4 for rolling are formed on the inner circumference...

AI Technical Summary

Problems solved by technology

In particular, in the outer ring 2, the hardened layer may reach the outer peripheral surface of the tube, and in some cases, the outer peripheral surface may be irregularly discolored

Images