Inertial drive

Patent metadata

Field	Value
Publication number	US-10250164-B2
Application number	US-201515127939-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Mar 21, 2014
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

An inertial drive is disclosed, comprising a length-changeable actuator element (I), a frame element ( 4 ) with a support section and with a deformation section, against the contact surfaces of which the actuator element bears, wherein the deformation section has an articulation section ( 13 ), a flat spring element ( 5 ) which is arranged on the deformation section and has a friction section ( 3 ) at the free end thereof, and a friction body ( 2 ), which can be driven, in mechanical contact with the friction section. A change in length (S) of the actuating element causes a rotatory movement (D) of the deformation section about the articulation section, which movement is transmitted via the spring element to the friction section for driving the friction body which can be driven.

First claim

The invention claimed is:

1. An inertial drive, comprising a variable-length piezoelectric actuator element, further comprising:
a frame element with a support section including a support surface on which a first end section of the actuator element is supported, and with a deformation section including an abutment surface against which a second end section of the actuator element bears, said second end section being situated opposite the first end section of the actuator element, wherein the deformation section has a joint section;
a flat spring element which is arranged on the deformation section of the frame element and which includes a friction section which forms a free end of the spring element; and
a friction body for being driven, which friction body is in direct or indirect mechanical contact with the friction section, wherein a length change of the actuator element gives rise to a rotational movement of the deformation section about the joint section, which rotational movement is transmitted via the spring element to the friction section for the purposes of driving the friction body for being driven, wherein the friction section is arranged spaced apart from the abutment surface of the deformation section when viewed in a direction which points away from the abutment surface;
wherein the frame element has a counterbearing section and a bearing section, wherein the spring element lies on the bearing section, and the section of the spring element between the counterbearing section and the bearing section forms a clamping section with a non-zero clamping length L S such that the spring element exerts a permanent preload directed toward the surface of the friction body, and said preload is transmitted via the frame element to the actuator element and effects a permanent pressure load on the actuator element, which pressure load is adjustable by way of the deformation of the spring element.

2. The inertial drive as claimed in claim 1 , wherein the support section has a support section mass and the deformation section has a deformation section mass, wherein the support section mass amounts to at least five times the mass of the deformation section mass.

3. The inertial drive as claimed in claim 1 , wherein the joint section is formed in one piece with the frame element and forms a flexure joint.

4. The inertial drive as claimed in claim 1 , wherein the spring element forms, between the bearing section and the friction section, a spring section with a non-zero spring length L F , and the spring length is at least twice the clamping length.

5. The inertial drive as claimed in claim 1 , wherein the compression force acting on the actuator element is at least as high as the normal force acting on the friction body and/or on the friction section.

6. The inertial drive as claimed in claim 1 , wherein the spring element is provided as a separate element, and the counterbearing section is designed such that the spring element can abut against it in a supporting manner.

7. The inertial drive as claimed in claim 6 , wherein the spring element has a width which varies over its length, wherein the width within the clamping section increases from the receiving section to the bearing section, and the width narrows at least in sections proceeding from the bearing section in the direction of the friction section.

8. The inertial drive as claimed in claim 7 , wherein the spring element has a minimum width at a position between the bearing section and the friction section.

9. The inertial drive as claimed in claim 6 , wherein the width of the spring element is constant in the region of the bearing section.

10. The inertial drive as claimed in claim 6 , wherein the friction section of the spring element has a friction element \ which is inserted into the spring element.

11. The inertial drive as claimed in claim 6 , wherein the lever extends between the bearing section and the joint section in a length L AAFK and between the center of gravity of the actuator element and the joint section in a length L ASFK , wherein the relationship of the length L AAFK to the length L ASFK lies between 1.2 and 3.

12. The inertial drive as claimed in claim 6 , wherein the frame element is formed in one piece with a superordinate structure that supports the frame element.

Assignees

• Phys Instrumente Pi Gmbh & Co Kg

Inventors

• HüBNER REINHARD

Classifications

• H02N2/025

  Inertial sliding motors · CPC title

• H02N2/043 Primary

  Mechanical transmission means, e.g. for stroke amplification · CPC title

• H02N2/026

  by pressing one or more vibrators against the driven body · CPC title