Bearing device equipped with resin-made pulley

Abstract

A bearing device equipped with a resin-made pulley has, at one axial end portion of an outer ring, cutout portions which are formed so as to be opened on their outward side of the axial direction and spaced from one another at a specified interval in a circumferential direction of the outer ring. Each cutout portion has a rectangular-shaped sloped surface which is sloped radially outward of the outer ring along an axial direction from an opening-side end to the center of the outer ring so as to adjoin the cylindrical surface portion on the axially opposite side to the opening. Each cutout portion further has side faces which are generally parallel to a vertical bisector plane of the sloped surface containing a center axis of the outer ring on circumferential both sides of the sloped surface in a cross section perpendicular to the center axis of the outer ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not intended to limit the present invention, and wherein:

FIG. 1 is an axial sectional view of a bearing device equipped with a resin-made pulley according to a first embodiment of the present invention;

FIG. 2 is an axial sectional view of an outer ring of the bearing device equipped with a resin-made pulley according to the first embodiment;

FIG. 3 is a radial sectional view sectioning through an cutout portion of the outer ring in the first embodiment;

FIG. 4 is an axial sectional view of a bearing device equipped with a resin-made pulley according to a second embodiment of the present invention;

FIG. 5 is an axial sectional view of an outer ring of the bearing device equipped with a resin-made pulley according to the second embodiment;

FIG. 6 is a radial sectional view sectioning through an cutout portion of the outer ring in the second embodiment;

FIG. 7 is a view for explaining an example of a method for forming the cutout portion in the second embodiment.

Claims

1. A bearing device equipped with a resin-made pulley, comprising: a rolling bearing having an inner ring, an outer ring, and rolling elements; anda resin-made pulley which has an inner circumferential surface in contact with an outer circumferential surface of the outer ring and which is integrally molded with the outer ring, whereinthe outer circumferential surface of the outer ring has a cylindrical surface portion, and one or more cutout portions provided at one end portion of an axial direction of the outer ring so as to be opened on their outward side of the axial direction and spaced from one another at a specified interval in a circumferential direction of the outer ring, andthe or each cutout portion has a sloped surface which is rectangular shaped as viewed from outward of a radial direction of the outer ring and which is sloped radially outward of the outer ring along a direction starting from an opening-side end of the axial direction of the cutout portion and approaching a center of the axial direction so as to adjoin the cylindrical surface portion on one side of the axial direction opposite to the opening side, the or each cutout portion further having side faces which are generally parallel to a vertical bisector plane of the sloped surface containing a center axis of the outer ring on circumferential both sides of the sloped surface in a cross section perpendicular to the center axis of the outer ring.

2. A bearing device equipped with a resin-made pulley, comprising: a rolling bearing having an inner ring, an outer ring, and rolling elements;a resin-made pulley which has an inner circumferential surface in contact with an outer circumferential surface of the outer ring and which is integrally molded with the outer ring, whereinthe outer circumferential surface of the outer ring has a cylindrical surface portion, and one or more cutout portions provided at one end portion of an axial direction of the outer ring so as to be opened on their outward side of the axial direction and spaced from one another at a specified interval in a circumferential direction of the outer ring,a bottom face of the or each cutout portion has a circular-arc shape as viewed in an axial sectional view of the outer ring running through the cutout portion,the bottom face of the or each cutout portion adjoins the cylindrical surface portion on an inward side of the axial direction and has a rectangular shape as viewed from outward of the radial direction, andthe or each cutout portion has side faces generally parallel to a vertical bisector plane of the bottom face containing a center axis of the outer ring on both sides of a circumferential direction of the bottom face.