Ramp actuator and angular-contact ball bearing unit having a cold-formed outer ring and an embossed ramp contour, and method for producing a ramp disc
A ramp actuator has a pivotable ramp disc, which on a first end face has at least one ramp, which is prepared for the rolling of a rolling body and, spaced apart therefrom, has a raceway for bearing rolling bodies of a rolling bearing prepared to receive radial and axial forces. A bearing ring can be fixed on a shaft, wherein the ratio of the axial width of the ramp disc relative to the support height thereof is between 2.9 and 4.1 and the ratio between the ramp radius of the ramp of the ramp disc relative to the support height of the ramp disc is between 0.7 and 1.3. A method for producing a ramp disc for such a ramp actuator includes drawing, upset forging and embossing, preferably carried out in that order.
1. A ramp actuator for a motor vehicle transmission or a motor vehicle clutch, comprising:
a pivotable ramp disc comprising:
a first end face comprising a ramp prepared for the rolling of a ramp rolling body, and
a raceway for bearing rolling bodies of a rolling bearing prepared to receive radial and axial forces, the raceway being axially spaced apart from the first end face such that the ramp rolling body and the bearing rolling bodies do not radially overlap, and
a bearing ring which can be fixed on a shaft, wherein:
a ratio of an axial width to a support height of the ramp disc is between 2.9 and 4.1 and
a ratio of a ramp radius of the ramp of the ramp disc to the support height of the ramp disc is between 0.7 and 1.3.
2. The ramp actuator according to claim 1 , wherein:
a ratio of a diameter of the bearing rolling body, designed as a ball, to the shoulder height of the bearing ring is ≥3:2, and
a wall thickness of the bearing ring at the apex of the bearing rolling body to the shoulder height of the bearing ring is between 0.2 and 0.6.
3. The ramp actuator according to claim 1 , wherein the ramp disc is designed as a sheet metal part produced without producing shavings.
4. The ramp actuator according to claim 1 , wherein the rolling bearing is an angular contact ball bearing.
5. The ramp actuator according to claim 1 , wherein:
there are three ramps which are separated in a segment-like manner over the circumference of the end face of the ramp disc, and
the three ramps each have a concave contour.
6. The ramp actuator according to claim 1 , wherein:
the end face of the ramp disc is provided by a flange,
the flange has a plurality of features evenly distributed over the circumference, and
each feature in the plurality of features is a radially protruding projection or an end-face groove.