Fitting for a vehicle seat

摘要

A fitting (10), in particular for a motor vehicle seat, having a first fitting part (11), on which a gear rim (17) is formed and a second fitting part (12) on which a gearwheel (16) is formed. The gearwheel meshes with the gear rim (17), whereby the two fitting parts (11, 12) are in geared connection with each other. The fitting also has a rotatably mounted, revolving eccentric driven by a driving element for driving a relative rolling motion of gearwheel (16) and gear rim (17). During this rolling motion a tooth flank (16d) of a tooth (16a) of the gearwheel (16) rests against a tooth flank (17d) of a tooth (17a) of the gear rim (17) at a contact point (K). The tooth flanks (16d, 17d) of the teeth (16a, 17a) of the gearwheel (16) and gear rim (17) resting against each other at the contact point (K) each follow the course of a portion of a respective logarithmic spiral.

主权项

1. A fitting for a motor vehicle seat, the fitting comprising:
a first fitting part on which is formed a toothed ring; a second fitting part on which is formed a toothed wheel which meshes with the toothed ring, as a result of which the two fitting parts are in gear connection with each other; a rotatably supported circumferential eccentric; and a driver, the eccentric being driven by the driver for driving a relative rolling movement of the toothed wheel and the toothed ring, wherein, during this rolling movement at one contact point a tooth flank of a tooth of the toothed wheel bears against a tooth flank of a tooth of the toothed ring, wherein the tooth flanks of the teeth of the toothed wheel and the tooth flanks of the teeth of the toothed ring which bear against each other at the contact point, follow the course of a section of one logarithmic spiral each, wherein an eccentricity is provided, defined as a distance between a center point of the toothed ring and a center point of the toothed wheel, wherein, with respect to the center point of the toothed wheel, the contact point is at an angle with respect to an extension of the eccentricity, said angle being 10° to 55°, wherein a contact force in the contact point can circulate almost uniformly in a defined direction and with a defined lever arm.