ROLLING BEARING WITH SEAL RING

摘要

Construction of a rolling bearing with seal ring can be achieved in which, while securing the required seal performance, the rotation support portion can be made more compact by shortening the dimension in the axial direction of the installation space for an inner ring 3a, and torque can be lowered. A sliding contact edge 23 of a seal lip 12a that is provided around the inner-circumferential edge portion of a seal ring 5a on one end side in the axial direction comes in sliding contact with one end surface 24 of the inner ring 3a. The tip-end edge of a protruding portion 20 closely faces the surface of the inner ring 3a, forming a labyrinth seal 19 in this portion. With this construction, a stopper ring 17 for regulating the position in the axial direction of the inner ring 3a with respect to a shaft 15 is located so as not to protrude from the end surface in the axial direction of the rolling bearing 1a with seal ring. The problem can be solved because the diameter of the sliding contact portion is kept small.

主权项

1. A rolling bearing with seal ring, comprising:
an outer ring that is provided with an outer ring raceway around an inner-circumferential surface thereof; an inner ring that is provided with an inner ring raceway around an outer-circumferential surface thereof, and that is located on an inner-diameter side of the outer ring so as to be concentric with the outer ring; a plurality of rolling bodies that are located in an internal bearing space that is formed between the outer ring and the inner ring, and that are arranged between the inner ring raceway and the outer ring raceway so as to be able to roll freely; and a seal ring that is formed into a circular ring shape and comprises: a fastening portion that is provided around one circumferential edge portion of an inner-circumferential edge portion and outer-circumferential edge portion, and that is fastened to at least one end portion of one of the outer ring and inner ring; and a seal lip that is made of an elastic material, that is provided around other circumferential edge portion of the inner-circumferential edge portion and outer-circumferential edge portion, a tip-end edge of which comes in sliding contact with one end surface of the other of the outer ring and inner ring; the seal ring separating the internal bearing space and an external space; the seal lip comprising a plate-shaped connecting portion that is formed in a portion near a center in a radial direction than the tip-end edge; and a thick portion that is continuous from the connecting portion and having a thickness dimension that is greater than the connecting portion; and the tip-end edge being composed of an end edge in an axial direction of the thick portion.