Automobile hub bearing unit

Abstract

The invention discloses an automobile hub bearing unit which comprises a braking disc and a rotating drum, wherein a convex shaft is arranged at the middle part of the rotating drum; two inner rings are sleeved on the convex shaft; conical-surface outer raceways are arranged on the inner rings; two rows of parallel conical-surface inner raceways are arranged inside the center hole of the braking disc; a conical roller is arranged between each conical-surface inner raceway and each conical-surface outer raceway; nuts are arranged at the end part of the convex shaft; and the nuts are in contactwith the outer side surfaces of the inner rings. In the invention, because the technical scheme is adopted, after the outer ring of a conical hub bearing and the braking disc are integrated into a whole, the machining of the raceways and the assembly of finished products are realized.

Description

technical field [0001] The invention relates to an automobile chassis part, in particular to an automobile wheel hub bearing unit of an automobile brake disc. Background technique [0002] Hyundai automobiles have generally adopted hub bearing units as wheel slewing bearing components, but due to the limitation of structure and installation space, some models adopt the first generation hub bearing embedded on the brake disc, and then connect the drum to realize the slewing bearing. Due to the heavy load of this model and the requirement of a large axial bearing capacity, the equipped bearings must be conical hub bearings with large specifications. [0003] In addition, the tapered roller bearing is made of high-carbon chromium bearing steel, while the brake disc is made of carbon steel. When the temperature of the tapered bearing changes during operation, the thermal expansion coefficients of the two materials will be different, which will cause the outer ring of the bearing...

AI Technical Summary

Problems solved by technology

[0003] In addition, the tapered roller bearing is made of high-carbon chromium bearing steel, while the brake disc is made of carbon steel. When the temperature of the tapered bearing changes during operation, the thermal expansion coefficients of the two materials will be different, which will cause the outer ring of the bearing to be different from the bearing steel. The interference fit between the brake discs changes, thereby changing the internal clearance of the bearings that was originally controlled very precisely, resulting in abnormal temperature rise in rotation, stagnation of the rolling elements, and early failure of the rolling contact surface

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