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Active material based bodies for varying surface texture and frictional force levels

A technology of active materials, surface textures, applied in the direction of friction linings, friction clutches, building elements, etc., which can solve the problems of not allowing actuators and motors, expensive, affecting the performance of antenna retraction and deployment

Inactive Publication Date: 2009-02-18
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this helical wrapping material creates a permanent rather than reversible antenna texture that affects the retraction and deployment properties of the antenna, for example in the case of a powered antenna
[0005] Also, however current means for varying the friction level would be expensive as separate brakes or motors would be costly
Additionally, other operational or functional requirements may not allow actuators and motors to be used to control friction levels

Method used

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  • Active material based bodies for varying surface texture and frictional force levels
  • Active material based bodies for varying surface texture and frictional force levels
  • Active material based bodies for varying surface texture and frictional force levels

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Embodiment Construction

[0016] Methods and apparatus for modifying surface texture and controlling friction of surfaces are described herein. Compared to the prior art, the methods and devices disclosed herein advantageously use active materials to modify the texture of a surface. The active material component of the surface allows friction to be controlled by altering the surface morphology of the active material component by changing the properties of the active material upon receipt of an activation signal. Depending on the nature of the altered active material and / or the existence of biasing or recovery mechanisms, such alterations may be reversible or permanent. As used herein, the term "active material" generally refers to a material that exhibits a change in properties (e.g., size, shape, orientation, shear force, elastic modulus, flexural modulus, yield strength, stiffness, etc.) upon application of an activation signal . Suitable active materials include, but are not limited to, shape memo...

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PUM

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Abstract

The invention relates to active material based bodies for varying surface texture and frictional force levels. Particularly a device for selectively controlling and varying surface texture includes a body having at least one surface, and an active material in operative communication with the at least one surface, wherein the active material is configured to undergo a change in a property upon receipt of an activation signal, wherein the change in a property is effective to change a texture of the at least one surface.

Description

technical field [0001] The present invention generally relates to methods and apparatus for selectively controlling and varying the texture of a surface and / or the level of friction on a surface. Background technique [0002] Some devices or methods rely on the creation or elimination of frictional forces between opposing contacting surfaces of two objects to perform a particular function or operation. Exemplary devices having surfaces configured to create or eliminate friction include clutches, brakes (drum brakes, disc brakes, etc.), bearings, road wheel drives, devices that control fluid flow on or between surfaces , tires, mechanical seals, fixtures, etc. Many of these devices do not control the level of friction force or control the level of friction force by adjusting the velocity of at least one contacting surface or the level of normal force exerted by at least one contacting surface. [0003] Furthermore, there is friction on the surface of the object even when th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16S1/06B32B33/00F16D13/64F16D65/12H01Q1/08
CPCF16D65/0031F16D2069/004F16D2069/005F16D69/00F16D28/00
Inventor A·L·布劳恩N·L·约翰逊N·D·曼凯姆N·K·布克诺尔G·P·麦克奈特W·巴沃萨-卡特A·C·基夫C·P·亨利G·A·埃雷拉
Owner GM GLOBAL TECH OPERATIONS LLC