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Piezoelectric rotary drive with loading device designed as a leaf spring

A technology of rotary drive and loading device, applied in the direction of piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve the problem of small preload force and contact pressure of piezoelectric actuators Small, uncertain contact pressure and other problems, to achieve the effect of simplified miniaturization, simple structure, high clamping force

Active Publication Date: 2020-04-14
PHYSIK INSTR PI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production and assembly of this spring clip (4) is relatively complicated
In addition, with the known spring clips (4) the settling phenomenon occurs many times, which can lead to a lower contact pressure of the coupling part against the shaft and / or a lower pressure of the two parts of the frame against the piezoelectric actuator, and therefore less preload force on the piezo actuator
In addition, tolerances in bending lead to undefined contact pressure or undefined preload force

Method used

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  • Piezoelectric rotary drive with loading device designed as a leaf spring
  • Piezoelectric rotary drive with loading device designed as a leaf spring
  • Piezoelectric rotary drive with loading device designed as a leaf spring

Examples

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Embodiment Construction

[0044] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0045] The frame 4 of the piezoelectric rotary drive 1 is substantially W-shaped and comprises three legs 4 a , 4 b , 4 c forming in an intermediate space two sockets opening towards the same side of the frame 4 . The shaft 2 is arranged in one of these sockets between the first outer leg 4 a and the central leg 4 b , wherein the axis of the shaft is oriented substantially perpendicular to the plane of extension of the frame 4 . These two legs 4a, 4b of the frame 4 form a substantially U-shaped coupling portion 5 extending over more than half the circumference of the shaft 2 and defining a coupling opening.

[0046] The piezoelectric actuator 3 is arranged in a further socket between the central leg 4b and the second outer leg 4c of the frame 4 . The second outer leg 4c is hingedly connected to the central leg 4b of the frame 4 by a flexible hinge 4d. ...

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Abstract

A piezoelectric rotary drive (1) for a shaft (2) is disclosed. The piezoelectric rotary drive (1) includes a piezoelectric actuator (3), a coupling part (5) capable of force-fitting with the shaft. ) coupling to achieve stick-slip actuation of a deformable frame (4), and a loading device (6) that applies a preload force to the coupling part and / or the actuator and / or the shaft. To facilitate production and assembly, the loading device is formed as a leaf spring which in the relaxed state extends essentially in a plane, preferably along a straight line.

Description

technical field [0001] The invention relates to a piezoelectric rotary drive for a shaft comprising at least one piezoelectric actuator, an adjustable and / or a deformable frame, and at least one loading device designed to apply a preloading force to the coupling portion and / or the actuator and / or the shaft. Background technique [0002] A universal piezoelectric rotary drive is known from DE 102011109590 A1. There, the coupling part (13) is clamped via the spring clips (4), thereby firstly increasing the contact pressure of the coupling part (13) onto the shaft (2) and secondly, via the spring clips (4) the frame (12 ) are pressed against the piezoelectric actuator (11) so that the portions (13, 14) always follow the piezoelectric deformation of the actuator (11). from DE 102011109590 A1 figure 1 It can be seen that the spring clip (4) has a strip-like design and is clamped on the end side between the two retaining parts. The two retaining portions for the spring clips ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/00H02N2/10
CPCH02N2/101H02N2/006
Inventor 赖因哈德·胡布纳汉斯约尔格·吕克特
Owner PHYSIK INSTR PI