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linear actuator

A technology of linear actuators and transmission devices, which is applied in the directions of electric components, transmission devices, magnetic circuit rotating parts, etc., can solve the problems of large structure space and complicated construction of linear actuators.

Inactive Publication Date: 2017-08-04
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the construction of linear actuators is very complex and in particular requires a large construction space

Method used

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  • linear actuator
  • linear actuator

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] figure 1 A linear actuator 1 according to the invention is shown comprising an electric motor 2 with a stator 3 and a rotor 4 . The corresponding power supplies and control devices provided for operation are obviously not shown in detail here. The rotor 4 is embodied as a hollow component. It is mounted for rotation via a radial bearing 5 , here a ball bearing, on a housing component 6 fastened on the stator side.

[0022] The rotor 4 has a hollow section 7 which forms a nut 8 which is part of a spindle drive, which is here embodied as a planetary roller drive 9 . The section 7 is implemented in such a way that it is largely located inside the stator 3, so that see figure 1 , the screw drive is also located almost entirely inside the stator.

[0023] In the example shown, the planetary rolling gear 9 comprises two outer rings 10 which are accommodated in a nut 8 in a rotationally fixed manner (drehfest) and which have corresponding grooves on their insides in a mann...

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PUM

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Abstract

The invention relates to a linear actuator comprising an electric motor with a stator and a rotor and a screw drive with a screw and a nut guided on the screw by means of rolling elements, the nut being coupled to the rotor, wherein , The nut (8) is supported on the housing member (16) through a planetary rolling bearing (15) against relative rotation.

Description

technical field [0001] The invention relates to a linear actuator comprising an electric motor with a stator and a rotor and a screw drive with a threaded screw and a nut guided on the threaded screw by rolling elements, the nut being coupled to the rotor. Background technique [0002] Linear actuators are used to perform linear adjustment tasks. A non-limitative example, however, is the use in machine tools as a dismounting unit of a tool holder in which a tool can be fastened in a replaceable manner. [0003] Linear actuators are known in various designs, for example see DE 20 2009 015 840 U1. There, a linear actuator is described which is also used for actuating the tool holder. A linear actuator consists of an electric motor with a stator and a rotor, wherein a threaded spindle is coupled to the rotor and thus is turned by the rotor. The threaded spindle is a component of the spindle drive, which is embodied there as a planetary roller drive. The spindle drive also i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B31/26B23B31/28H02K7/06
CPCB23B31/261B23B31/28H02K7/06B23B2260/11B23B2231/50F16H25/2252F16H2025/2078H02K1/22H02K5/173H02K7/003H02K7/085H02K7/116
Inventor 迪特马尔·鲁迪
Owner SCHAEFFLER TECH AG & CO KG