Hollow tapered roller and processing method thereof

Abstract

The invention belongs to the technical field of bearing assembling and manufacturing, and particularly relates to a hollow tapered roller and a machining method thereof.The hollow tapered roller comprises a tapered roller body, a central through hole penetrating in the axial direction is formed in the center of the tapered roller body, and the central through hole comprises a cylindrical hole, a horn-shaped taper hole and a central taper hole; the two ends of the cylindrical hole obliquely extend in the outer diameter direction to form horn-shaped taper holes, the large-diameter ends of the horn-shaped taper holes obliquely extend in the outer diameter direction to form center taper holes used for positioning, the center taper holes extend to the end face of the tapered roller body, and the taper of the center taper holes is larger than that of the horn-shaped taper holes. And the axes of the tapered roller body, the cylindrical hole, the trumpet-shaped taper hole and the central taper hole coincide. A center taper hole structure is additionally arranged on the end face of the tapered roller, the center taper hole serves as the machining positioning reference in the grinding machining procedure, the positioning reliability is guaranteed, the center taper hole and the cylindrical hole are coaxial, the machining positioning reference is consistent with the design reference and the measurement reference, and the grinding machining precision is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of assembly and manufacture of bearing rollers, and in particular relates to a hollow tapered roller and a processing method thereof. Background technique [0002] Most of the large and extra large tapered roller bearings use the hollow tapered roller structure. The tapered roller bearings of this structure have the characteristics of large rated load and strong bearing capacity, and are widely used in large and extra large tapered roller bearings. For conventional hollow tapered rollers, in the grinding process, the machining positioning reference of the outer diameter surface of the grinding roller and the spherical base surface is determined by the small end face of the roller (non-reference end face, limited to 3 degrees of freedom) and the outer diameter surface of the roller (limited 2 degrees of freedom) joint positioning, which belongs to the principle of short pin positioning. [0003] There are th...

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Problems solved by technology

[0003] There are the following problems in using the small end surface of the roller as the processing positioning reference: 1. The precision of the reference surface itself is not high, which affects the positioning accuracy. 2. The area of ​​the small end surface of the roller is small, and there is a problem of unstable positioning. 1. The measurement benchmarks are inconsistent, there are positioning errors, and the runout tolerance of the outer diameter surface of the ball base surface is not easy to control. 4. The processing tolerance of the roller diameter (roller big head diameter) is affected by the roller length tolerance

[0004] This kind of roller processing and positioning cannot control the coaxial accuracy of the outer diameter surface of the roller and the cylindrical hole in the middle of the roller, and the coaxial tolerance dispersion is large

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