Abstract: A linear actuator (1) comprising a housing (6), a motor (2) comprising a stator with coils (4), a screw-nut system, and a rotor (5) axially and radially supported on the motor side by a bearing (11). The bearing comprises a ball (14) rigidly attached to the rotor, a cylindrical cavity (15) formed or positioned in the housing into which the ball (14) is inserted. A stop (17) is positioned in the cavity, supported in an axial direction of the rotor, against the ball (14) in essentially one point.

Abstract: A linear actuator (1) comprising a housing (6), a motor (2) comprising a stator with coils (4), a screw-nut system, and a rotor (5) axially and radially supported on the motor side by a bearing (11). The bearing comprises a ball (14) rigidly attached to the rotor, a cylindrical cavity (15) formed or positioned in the housing into which the ball (14) is inserted. A stop (17) is positioned in the cavity, supported in an axial direction of the rotor, against the ball (14) in essentially one point.

Abstract: A vehicle headlight positioning device comprising a pivoting headlight support and a linear actuator comprising a housing (16), an electric stepping motor with a rotor having a part in the form of a nut, and a linear-movement screw engaging the nut part of the rotor. The screw has a coupling portion arranged at one of its ends and is intended to transversely engage a coupling portion part integral with a pivotable headlight support.

Abstract: A linear actuator for displacing a member or a set of movable members, having an electric stepping motor (7) with a rotor having a portion in the form of a nut (9), and a linear-movement screw (12) engaging the nut portion of the rotor. The screw has a coupling portion (19) disposed at an extremity and intended to engage a coupling portion (5) of the movable member to be displaced.

Abstract: A linear actuator for the control of a valve, includes a motor portion (2) and an actuator device portion (3) comprising a rotatable member (9) provided with a threaded portion (10) matching the threaded portion of a linear displacement threaded bolt (11) the rotatable member being supported by bearings (15, 16) and drivable in rotation by the motor portion. The linear actuator further includes an axially compressible coil spring (19) mounted in a compressed state between a valve head (37) arranged at one end of the threaded bolt (11) and the casing of the actuator, wherein the threaded portion (10) of the threaded bolt is comprised of at least one thread arranged at an angle ? relative to a plane orthogonal to the axial direction of motion of the threaded bolt and wherein the characteristic tan (?) exceeds the friction coefficient ? between the threaded bolt and the rotatable member, so that the motion of the threaded bolt is reversible.

Abstract: A membrane or piston pump drive comprises a stepping motor (2) and a rotary-to-linear conversion mechanism for converting the rotary movement into a translation movement (6). The rotary-to-linear conversion mechanism comprises a rotary member (4) and a piston member (7) intended to move a piston or a membrane of the pump. The stepping motor comprises a rotor coupled to the rotary member which engages the piston member (7) in order to drive it in an essentially linear reciprocating movement.

Abstract: A vehicle headlight positioning device comprising a pivoting headlight support and a linear actuator comprising a housing (16), an electric stepping motor with a rotor having a part in the form of a nut, and a linear-movement screw engaging the nut part of the rotor. The screw has a coupling portion arranged at one of its ends and is intended to transversely engage a coupling portion part integral with a pivotable headlight support.

Abstract: A linear actuator for displacing a member or a set of movable members, having an electric stepping motor (7) with a rotor having a portion in the form of a nut (9), and a linear-movement screw (12) engaging the nut portion of the rotor. The screw has a coupling portion (19) disposed at an extremity and intended to engage a coupling portion (5) of the movable member to be displaced.

Abstract: An actuator (1) for the linear displacement of a member to be controlled comprising a motor part (2) and an actuating device part (3) including a threaded screw (11) with linear displacement, and a rotary member (9) provided with a threaded portion (10) matching the screw thread, the rotary member capable of being driven in rotation by the motor part and being supported by bearings (15,16) in the form of roller bearing stops with four contact points arranged on either axial side of said threaded portion to guide the rotary member axially and radially. The raceways of the balls are directly in the rotary member and integral with parts of the body (14) or the cover (13) of the actuator.

Abstract: The invention concerns a ball screw-nut device comprising a screw (2) and a nut (3), the nut including a housing (7) and a ball-bearing element (4) comprising a raceway (13) and a plurality of balls (15), the ball-bearing element (4) being produced as an independent part which assembled with the housing.

Abstract: The invention concerns an actuator (1) for the linear displacement of a member to be controlled comprising a motor part (2) and an actuating device part (3) including a threaded screw (11) with linear displacement, and a rotary member (9) provided with a threaded portion (10) matching the screw thread, the rotary member capable of being driven in rotation by the motor part and being supported by bearings (15, 16) in the form of roller bearing stops with four contact points arranged on either axial side of said threaded portion to guide the rotary member axially and radially. The raceways of the balls are directly in the rotary member and integral with parts of the body (14) or the cover (13) of the actuator.

Abstract: A simple, inexpensive, and effective linear actuator design comprises a motor adjacent to a speed-reducer, with the driven stem of the speed-reducer passing through the rotor of the motor. The stem has one bearing at one end of the reducer and its second bearing at the end of the motor, in a bearing part likewise serving as a bearing for the rotor. The distance between the two bearings is increased, and the second bearing includes a socket which has a radial elasticity owing to the fact that it is monolithically joined to the fixed bearing part via a thin portion. This second bearing part is advantageously of synthetic material. The rotation of the stem actuates a driven linear-motion part, which is prevented from rotating and which executes a translatory movement.

Abstract: In order to obtain very long operating autonomy without maintenance, with low power consumption and low wear and tear, both the energizing and de-energizing of a DC motor are controlled by an electronic switching circuit providing bounce-free switching. A switching-on control circuit actuates the switching circuit, causing it to energize the motor. A switching-off control device, comprising a rotary component connected to the motor shaft and including contact elements responsive to the position of the rotary component, actuates the switching circuit to cut off the power supply to the motor after the rotary component has rotated through a predetermined angle. The arrangement is advantageous for driving apparatus which is not easily accessible and lacks reliable mains power. Another useful particularity consists in a multiple plug device whereby the rate of intermittent driving may be varied within the range of 1 day to 31 days.

Abstract: An electrical drive device comprising a stator arrangement of the claw pole type surrounding a stator chamber or compartment and producing therein at least one magnetic field containing at least one rotary field component. There is provided a permanent magnet-rotor arranged in such rotor chamber in such a manner that it rotates in synchronism with such magnetic field and a hysteresis magnetic coupling, the driving part of which is form-lockingly connected with such rotor and the driven part of which is force-lockingly secured to a shaft constituting the power take-off shaft of the drive device. The stator arrangement, the rotor, the driving part of the hysteresis magnetic coupling and the driven part of such coupling are all housed in a common housing.