| 摘要 |
PURPOSE:To provide a tapered roller bearing, in which a circumferential groove is formed at the bottom of an annular recess that is defined by the raceway surface of outer ring and the roller guiding surface of thrust ring, and oil draining holes are formed in the thrust ring to open in said circumferential groove, whereby it is enabled to improve efficiency of draining lubricating oil and thus to fit the bearing for high-speed operation. CONSTITUTION:Thrust ring 4 is fitted axially in a large-diametered, circumferentially stepped portion 2c of outer ring 2, with its end face 4a being held in tight contact with side face 2c' of said stepped portion 2c, and shoulder of the stepped portion 2c contiguous to the conical raceway surface 2a of outer ring 2 is formed into chamfered face 2c''. A circumferetial groove 8 opening at the bottom of annular recess 6 is defined by the chamfered surface 2c'' constituting a portion of side face 2c' and end face 4a of thrust ring 4 facing the chamfered face 2c'', and a proper number of oil draining holes 7 are formed axially in thrust bearing 4 such that they open in the circumferential groove 8 and locate radially on the outside of roller guiding surface 4b of thrust bearing 4. With such an arrangement, it is enabled to improve efficiency of draining lubricating oil and to fit the bearing for high-speed operation.
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