Loading patent…
AssigneeValeo Auto-Electric Wischer und Motoren GmbH
InventorsJosef Klar, Johannes Helmich, Friedrich Kaiser, Ronald Frey, Werner Baeskow
Estimating the term…
The invention relates to a drive device (1) comprising an electric drive motor (2), a housing (4), at least one shaft (8) which is driven by the drive motor and means for compensating the axial clearance of said shaft. The invention is characterized in that a spring ring disk (19), which can be expanded radially counter to an elastic force and has two stopping surfaces radially extending towards each other on the axis of the shaft in the form of a wedge, is arranged on the shaft as said compensating means. The invention is also characterized in that shaft has a ring-shaped projection (22) which matches one of stopping surfaces and the housing has an annular collar (23) which matches the other stopping surface. The spring ring disc (19) is pre-tense and arranged in between the projection (22) and the annular collar (23).
Drive device (1) with an electric drive motor (1), with a housing (3, 4, 13), with at least one shaft (8) driven by the drive motor and with compensating means to compensate for axial play of the shaft, characterized in that a tapered thrust bearing (19) is positioned on the shaft (8) as compensating means, which can be radially expanded against spring force, with two contact surfaces (20, 21) tapering radially toward the shaft axis, that the shaft (8) has an annular projection (22) corresponding to one of the contact surfaces (21) and the housing (4, 13) has an annular collar (23) corresponding to the other contact surface (20), where the tapered thrust bearing (19) is positioned under pre-load between the projection (22) and the annular collar (23).
Drive device (1) in accordance with one of the preceding claims, wherein the tapered thrust bearing (19) has a slotted spring clamping wire.
Drive device (1) in accordance with one of the preceding claims, wherein the shaft (8) has an annular groove-like recess (37) in which the tapered thrust bearing (19) is retained by positive engagement.
Drive device (1) in accordance with one of the preceding claims, wherein the tapered thrust bearing (19) is made of plastic, specifically a polyamide, where the plastic has an anti-friction coating specifically of graphite, molybdenum disulfide or similar, or contains graphite, molybdenum disulfide or similar.
Drive device (1) in accordance with one of the preceding claims, wherein the projection (22) is located on a gear wheel, specifically a worm wheel (7) of a worm gear.
Drive device (1) in accordance with one of the preceding claims, wherein the projection (22) is made of a plastic, specifically of polymethylene oxide.
Drive device (1) in accordance with one of the preceding claims, wherein the annular collar (23) is located on a housing cover (13) of the housing (4), specifically a zinc die-cast cover.
Dependencies are inferred from the claim text.