Device for protecting an optical sensor
The invention relates to a device for protecting an optical sensor for a motor vehicle, said optical sensor comprising an optic, a casing mounted to rotate about an axis of rotation (A 1 ) and having a housing configured to receive the optical sensor, an optical element rigidly attached to the casing and configured to be arranged in the field of vision of the optical sensor, and an actuator coupled to the casing in order to rotate the casing and the optical element, the actuator comprising a rotor and a stator configured such that actuator is a motor with an internal rotor.
1. A protecting device for protecting an optical sensor for a motor vehicle, the optical sensor including an optic, the device comprising:
a casing mounted rotatably about a rotation axis and having a housing configured to receive the optical sensor,
an optical element rigidly connected to the casing and configured to be placed in the field of vision of the optical sensor, and
an actuator coupled to the casing in order to rotate the casing and the optical element, the actuator including a rotor and a stator which are configured such that the actuator is a motor having an internal rotor, with the rotor including three successive portions forming an actuating portion carrying a magnetic mass configured to drive the rotor, a guide portion for guiding the rotor inside the stator, and a drive portion rigidly connected to the casing, with the drive portion having an average diameter with a value greater than the value of the average diameter of the actuating portion.
2. The protecting device as claimed in claim 1 , wherein at least part of the rotor extends inside a volume defined by the stator, the at least part of the rotor carrying the magnetic mass is a middle part of the rotor.
3. The protecting device as claimed in claim 1 , wherein the casing is fixed directly on the rotor.
4. The protecting device as claimed in claim 1 , further comprising an intermediate piece forming a link between the casing and the rotor.
5. The protecting device as claimed in claim 4 , wherein the intermediate piece includes an intermediate drive portion rigidly connected to the casing and an intermediate guide portion linking the intermediate drive portion to the drive portion of the rotor.
6. The protecting device as claimed in claim 4 , wherein the intermediate piece has an overlapping ring extending the guide portion and overlapping one of the ends of the stator with the overlapping ring surrounding a portion of the stator.
7. The protecting device as claimed in claim 1 , wherein the actuator is a hollow motor.
8. The protecting device as claimed in claim 1 , wherein the optical sensor is extended at one axial end by a support shank housed at least partially inside the rotor internal to the hollow motor.
9. The protecting device as claimed in claim 1 , further comprising a mobile part and a fixed part, the mobile part including at least the rotor and the casing, and the fixed part including at least the stator and further comprising at least one first rolling bearing arranged between the mobile part and the fixed part.
10. The protecting device as claimed in claim 9 , further comprising at least one second rolling bearings is arranged between the rotor and a support shank.
11. The protecting device as claimed in claim 1 , wherein the stator includes a transverse wall perpendicular to the rotation axis of the casing and placed in the opposite direction to the optical element, the transverse wall including a sleeve for receiving an end of a support shank.