US 2004/0070287 A1 · Linear actuator

Abstract

An improved linear actuator incorporates a DC motor whose stator is secured to a frame is provided for. To improve operational longevity and reliability of a linear actuator, the improved actuator includes a retention clutch and an axial load limiter. An axially configured retention clutch is configured to slidably fit within the open inner channel diameter of an axial load limiter and over a motor shaft of a linear actuator. In operation, the retention clutch reduces the impact loads on the stop and extending the fatigue life of these wearable components. Similarly, when the screw encounters axial loads during operation, these loads are distributed across both the axial load limiter and the motor, thereby reducing direct forces on the motor and contributing to an extended use of the motor component.

Claims20

Dependent claims

An improved linear actuator comprising:

a direct current (DC) motor having a stator and a rotor, said stator fixed to a reference frame;
a threaded shaft coupled to said rotor;
a spring means disposed perpendicular to said axis of said threaded shaft, said spring means comprising a center portion coaxially attached to said threaded shaft and an outer portion attached to said reference frame;
a translation actuator threadedly coupled to said threaded shaft, said actuator rotationally stopped and operable to laterally translate in response to rotation of said threaded shaft by said DC motor;
a retention clutch;
and
an axial collar means of a predetermined length positioned between said threaded shaft and said motor to form a gap area.

4 more elements

Dependencies are inferred from the claim text.

Linear actuator

Life of this patent

Linear actuator

Life of this patent

Abstract

Claims20