Directional bearing for ball joint
A ball joint having alignment guides to ensure correct assembly of a directional bearing into the internal chamber of a housing, the directional bearing having an elliptical external surface engaging a mating elliptical alignment surface of the internal chamber such that the ball end of the ball joint stud is pivotally mounted for angular motion within a major swing plane and a minor swing plane relative to the housing axis.
1. A ball joint comprising:
a housing having an internal chamber having a bearing seat with a first alignment guide and an open end, the housing and open end having a housing axis;
a ball stud having a longitudinal stud axis, a spherical ball end within the housing and a shank extending axially out of the open end of the housing;
a directional bearing having an external surface engaging the bearing seat, the external surface having a second alignment guide mating with the first alignment guide, wherein the first alignment guide and the second alignment guide comprise elliptical mating surfaces mechanically interlocking with each other whereby relative rotation about the housing axis between the directional bearing and the housing is prevented, and the directional bearing having an internal spherical surface within which the ball end is pivotally mounted for angular motion of the longitudinal stud axis within a major swing plane through the housing axis in a range of ±angle α relative to the housing axis and a minor swing plane through the housing axis in a range of ±angle β relative to the housing axis, where α is greater than β, wherein an elliptical edge of the housing defines an opening of the open end, and wherein the range of ±angle α and the range of ±angle β is defined by the elliptical edge for allowing the ball stud to swing without interference to a greater degree along the major swing plane compared to the minor swing plane.
2. An automotive component having an opening through which a ball joint extends, the automotive component including a third alignment guide, the ball joint comprising:
a housing having a radially extending flange having a fourth alignment guide, an internal chamber having a bearing seat with a first alignment guide and an open end, the housing and open end having a housing axis;
a ball stud having a longitudinal stud axis, a spherical ball end within the housing and a shank extending axially out of the open end of the housing;
a directional bearing having an external surface engaging the bearing seat, the external surface having a second alignment guide mating with the first alignment guide, wherein the first alignment guide and the second alignment guide comprise elliptical mating surfaces mechanically interlocking with each other whereby relative rotation about the housing axis between the directional bearing and the housing is prevented, and the directional bearing having an internal spherical surface within which the ball end is pivotally mounted for angular motion of the longitudinal stud axis within a major swing plane through the housing axis in a range of ±angle α relative to the housing axis and a minor swing plane through the housing axis in a range of ±angle β relative to the housing axis, where α is greater than β, wherein an elliptical edge of the housing defines an opening of the open end, and wherein the ramie of ±angle α and the ramie of ±angle β is defined by the elliptical edge for allowing the ball stud to swing without interference to a greater degree along the major swing plane compared to the minor swing plane.
3. The automotive component according to claim 2 comprising a protrusion adjacent the opening of the automotive component through which the ball joint extends, wherein the radially extending flange of the housing includes a recess matching the protrusion.