Step actuator

Patent metadata

Field	Value
Publication number	US-9644719-B2
Application number	US-201414448660-A
Country	US
Kind code	B2
Filing date	Jul 31, 2014
Priority date	Oct 14, 2008
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A step actuator includes a housing, a stator in the housing, a rotor including a magnet provided radially inward of the stator and a nut member inserted into the magnet and protruding through one side of the housing, a bearing rotatably supporting the nut member, a screw member coupled with the nut member to linearly move as the rotor rotates, and a mounting member supported on one side of the housing to support the screw member in such a manner that the screw member is linearly movable. The nut member includes an end portion passing through the bearing and a coupling portion extending from the end portion to couple with the bearing.

First claim

What is claimed is:

1. A step actuator comprising:
first and second housings;
a stator including first and second bobbins and first and second yokes;
a rotor including a magnet and a nut member;
a bearing rotatably supporting the nut member;
a screw member coupled with the nut member to linearly move as the rotor rotates;
a bearing cover coupled with the second housing; and
a mounting member disposed on the bearing cover to support the screw member in such a manner that the screw member is linearly movable,
wherein the magnet includes a spline hole provided at an inner peripheral surface thereof, and
wherein the nut member includes a spline provided at an outer peripheral surface thereof and coupled with the spline hole formed in the magnet.

2. The step actuator of claim 1 , wherein a surface of the spline hole is curved, and
wherein a surface of the spline is curved.

3. The step actuator of claim 1 , wherein the first bobbin is facing the magnet and the nut member further includes a recess.

4. The step actuator of claim 3 , wherein the recess is recessed in a first direction.

5. The step actuator of claim 1 , wherein the first bobbin includes a blocking portion to restrain the movement of the screw member in a first direction.

6. The step actuator of claim 1 , wherein the nut member partially overlaps with the magnet in a circumferential direction where the spline and the spline hole are present.

Assignees

• Lg Innotek Co Ltd

Inventors

• Hyun Woo Jin

Classifications

• F16H25/2015

  Means specially adapted for stopping actuators in the end position; Position sensing means · CPC title

• F16H2025/2078

  the rotor being integrated with the nut or screw body · CPC title

• Y10T74/19702

  Screw and nut · CPC title

• F16H27/02 Primary

  with at least one reciprocating or oscillating transmission member · CPC title

• H02K7/083

  radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title