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Linear actuator comprising a shape memory alloy coil spring operating at low electrical power

A technology of linear actuators and helical springs, applied in the direction of mechanisms that generate mechanical power, engine components, machines/engines, etc., can solve problems such as spring connections that are not mentioned

Pending Publication Date: 2021-10-29
SAES GETTERS SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The linear actuator member consists of a SMA coil spring with a ratio between the outer diameter of the coil spring and the thickness of the coil wire of 4.08, but there is no mention of how said spring is connected to the actuator unit and to the driven element

Method used

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  • Linear actuator comprising a shape memory alloy coil spring operating at low electrical power
  • Linear actuator comprising a shape memory alloy coil spring operating at low electrical power
  • Linear actuator comprising a shape memory alloy coil spring operating at low electrical power

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Embodiment Construction

[0019] In the above-mentioned drawings, only basic elements for understanding the present invention are shown, and auxiliary parts such as current supply sources are not shown, because auxiliary parts are common devices known in the technical field. Additionally, component dimensions and dimension ratios were varied in some cases to improve component readability, specifically but not exclusively with reference to SMA wire diameters.

[0020] The present invention is not limited to any particular shape memory alloy material, although preferred are nickel-titanium based alloys, for example commonly known under the trade name Nitinol, the basic properties of which are described in US4830262. Newer and improved shape memory alloys described in US 8152941 and US 8430981 under the name SAES Smart Materials may also be used.

[0021] In particular, the term nickel-titanium based shape memory alloys includes shape memory alloys whose main content is nickel and titanium (at least 60% a...

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Abstract

The present invention relates to linear actuators comprising an electrically-controlled shape memory alloy coil spring (23) suitable to provide linear displacements in valves, switches, lock systems and provided with a crimped terminal at each extremity, each of said crimped terminals comprising a crimping component (21) and an engaging member (22) suitable to mount the spring (23) into the linear actuator. The invention further discloses the use of said spring (23) with particular geometrical characteristics and crimping system assuring the maximization of the available stroke and fatigue life, structural simplicity, low electrical power requirements and thermal inertia, small size.

Description

technical field [0001] The present invention relates to an actuator comprising an electrically controlled shape memory alloy coil spring suitable for controlling linear displacement in valves, switches, locking systems etc. and requiring low voltage and current. Background technique [0002] Actuators are well known in various industrial applications such as wastewater treatment plants, power plants, manufacturing plants and oil refineries, as well as in certain consumer or residential installations such as white goods. Actuators can be coupled with so-called monostability mechanisms or multistability mechanisms to assist actuator assembly applications, monostability or multistability means that the object has one or more (two or more) stable states respectively Ability. Holding an object in any one of the stable states (e.g., the two states of a bistable object) requires little or no energy, whereas displacing an object from a stable state (e.g., between two given states) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03G7/06
CPCF03G7/065F03G7/06F03G7/06145F03G7/06143F05B2280/5006F03G7/0616
Inventor 马尔科·奇特罗卢卡·富马加利马泰奥·扎内拉米凯莱·斯卡拉塔
Owner SAES GETTERS SPA