DRIVE UNIT FOR A KINEMATIC SYSTEM IN A MOTOR VEHICLE
A drive unit for a kinematic system in a motor vehicle. In particular, the drive unit is provided for independently moving two movable elements, such as blades for guiding an air current of an air vent. The movable elements are driven by way of an actuator plate, which includes a radial cam rotating and radially displacing a slide, which consecutively rotates two output elements. As a result of a referencing section, a defined position of the slide can be ensured without necessitating a sensor.
1 . A drive unit for a kinematic system in a motor vehicle, including a cam control unit for moving a first movable output element and for, independently thereof, moving a second movable output element, the cam control unit comprising a radial cam and a sliding block, which, during a movement of the radial cam relative to the sliding block, moves along the radial cam and, in the process, is moved by the radial cam, and which, during the movement thereof, moves the first and second movable output elements, the radial cam having at least one ramification into at least two cam branches and a shifting gate, which, during a back and forth movement of the radial cam relative to the sliding block, moves the sliding block consecutively from a first cam branch to a last cam branch, the first cam branch, during the relative movement of the radial cam with respect to the sliding block, moving the first movable output element, and a second cam branch of the radial cam, during the relative movement of the radial cam with respect to the sliding block, moving the second movable output element, and the radial cam comprising a return cam, which returns the sliding block to the first cam branch after exiting a last cam branch, wherein the radial cam comprises a referencing section for establishing a defined position of the radial cam in relation to the sliding block, regardless of the movement of an output element; the referencing section, after the last cam branch, branches off the shifting gate or off the return cam, and is reached by the sliding block from the shifting gate or from the return cam, after the last cam branch, when returning from the last cam branch to the first cam branch; and the sliding block, as a result of a limited return movement, reaches the return cam or the shifting gate again from the referencing section.
2 . The drive unit according to claim 1 , wherein the radial cam comprises a first counter cam branch, serving as a cam branch, which, during the relative movement of the radial cam with respect to the sliding block, moves the first movable output element in a direction opposite that of the first cam branch; and the radial cam comprises a second counter cam branch, serving as a cam branch, which, during the relative movement of the radial cam with respect to the sliding block, moves the second movable output element in a direction opposite that of the second cam branch.
3 . The drive unit according to claim 1 , wherein the referencing section includes a stub cam having a closed end as a reference position.
4 . The drive unit according to claim 1 , wherein the referencing section is located outside an outline defined by the cam branches.
5 . The drive unit according to claim 4 , wherein the referencing section is located outside an outline of all other sections of the radial cam.
6 . The drive unit according to claim 1 , wherein the sliding block, in the referencing section, actuates a non-movement block, which blocks the movable output element or elements to prevent a movement.
7 . The drive unit according to claim 1 , wherein the radial cam can be rotated about an axis of rotation; and the cam branches and/or the referencing section extend in a curved manner on a limited circumferential section around the axis of rotation.
8 . The drive unit according to claim 1 , wherein the shifting gate connects the cam branches in a zigzag-shaped manner.
9 . The drive unit according to claim 1 , wherein the sliding block, in the first cam branch, moves a transfer element, which transfers the movement to the movable output element.
10 . The drive unit according to claim 6 , wherein the transfer element comprises the non-movement block.
11 . The drive unit according to claim 1 , configured to pivot two air guide elements of an air vent.