JP2013029196A5 - - Google Patents

Description

Further, as in the invention described in claim 8, if the coupler ring is made of chromium steel containing 0.9 to 1.2 wt% of Cr and is hardened by quenching and tempering, the strength of the coupler ring is increased. In the caulking process, it is possible to prevent excessive stress from being generated in the coupler ring and thereby causing deformation and microcracks.

Claims (10)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a cylindrical small-diameter stepped portion extending in the axial direction on the outer periphery, and a small diameter stepped portion of the hub wheel via a predetermined squeezing An inner member formed of at least one inner ring press-fitted and formed with a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery;
A double-row rolling element accommodated between the rolling surfaces of the inner member and the outer member via a cage so as to freely roll,
A coupler ring in which an inner peripheral spline portion and an outer peripheral spline portion are formed is fitted to the end portion of the small-diameter step portion of the hub wheel, and the end portion of the small-diameter step portion is formed by plastic deformation radially outward. In the wheel bearing device in which the inner ring is fixed in the axial direction via the coupler ring by a caulking portion,
The inner peripheral spline portion of the coupler ring includes a plurality of spline grooves and a plurality of spline protrusions alternately formed, and a plurality of splines formed alternately on the outer peripheral surface on the inner side of the small diameter step portion of the hub wheel. The hub spline part which consists of a concave line and a plurality of spline convex lines meshes with each other, and the end surface of the spline convex line of the hub spline part is formed by a single arc having a predetermined radius of curvature R. It is larger than the dimension A (R> A) from the end surface of the inner side of the coupler ring to the edge of the spline ridge, and larger than the height h of the spline ridge (R> h). A wheel bearing device characterized by being set.   When the groove diameter of the spline groove of the hub spline part is Da and the inner diameter of the spline protrusion of the inner peripheral spline in the coupler ring is Db, the inner diameter Db of the spline protrusion is the diameter of the spline groove of the hub spline part. The wheel bearing device according to claim 1, wherein the wheel bearing device is larger than the groove diameter Da and has a diameter difference ΔD = (Db−Da) of 1.0 mm or less.   A tapered surface is formed at the inner diameter of at least the inner end of the spline ridges at the inner peripheral spline portion of the coupler ring, and the starting point of the tapered surface is the edge of the spline ridge of the hub spline portion. And the bearing apparatus for wheels of Claim 1 or 2 arrange | positioned in the range with the bottom part of the said spline groove.   A tapered chamfered portion is formed at the inner diameter of at least the inner end of the both ends of the coupler ring, and the radial dimension H1 of the chamfered portion is the height H0 of the spline protrusion of the inner peripheral spline portion. 4. The wheel bearing device according to claim 1, wherein the wheel bearing device is set to be larger (H1 ≧ H0).   The wheel bearing device according to any one of claims 1 to 4, wherein a tapered chamfered portion is formed at least at an end portion on the inner side of both end portions of the spline recess in the inner peripheral spline portion of the coupler ring.   5. The arc-shaped chamfered portion having a predetermined radius of curvature is formed at least at the end on the inner side of both end portions of the spline recess in the inner peripheral spline portion of the coupler ring. Wheel bearing device.   The wheel bearing device according to any one of claims 1 to 4, wherein a spline groove in an inner peripheral spline portion of the coupler ring is stopped at an inner end portion to form a non-groove portion. The wheel bearing device according to claim 1, wherein the coupler ring is made of chromium steel containing 0.9 to 1.2 wt% of Cr, and is hardened by quenching and tempering.   The wheel bearing device according to claim 8, wherein the coupler ring is made of chromium molybdenum steel containing 0.15 to 0.3 wt% of Mo.   An outer joint member constituting a constant velocity universal joint is coupled to the inner member, and an axle side spline portion having the same diameter and the same shape as the outer peripheral spline portion of the coupler ring is formed on the outer peripheral surface of the outer joint member. In addition, the outer peripheral spline part and the axle side spline part are arranged coaxially with each other, and the inner side spline part of the drive switching gear ring slidable in the axial direction is meshed with the axle side spline part. Item 2. A wheel bearing device according to Item 1.