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Actuator

A technology for actuators and sleeves, applied in the direction of fluid pressure actuators, textiles, fabrics, etc., can solve the problems of unsatisfactory durability, high strength, and lack of pneumatic actuators

Active Publication Date: 2021-06-04
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned conventional pneumatic actuator using air as hydraulic fluid does not have particularly high strength (pressure resistance), for example, its strength is only about 0.5 MPa at most
[0003] In this regard, when the actuator is used as a hydraulic actuator using liquid such as oil, or water, etc. as the hydraulic fluid, the durability of the above-mentioned conventional pneumatic actuator is not satisfactory because the hydraulic actuator The device usually withstands high pressure, such as 50MPa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～3、6、7 and 10

[0172] (Preparation of Actuator)

[0173] have figure 1 and 2 Actuator samples of the shown structures were each prepared by using a tube sample and its corresponding grid-shaped sleeve sample. The distance between the sealing mechanism 200 and the sealing mechanism 300 of the actuator sample was 250 mm. "COSMO SUPER EPOCH UF46" manufactured by COSMOOIL LUBRICANTS Co., Ltd. was used as the hydraulic oil integrated in the pipe of the actuator. The durability of the actuator samples thus prepared was evaluated by the following method. The results are shown in Table 3 and Table 4.

[0174] The blend formulation of the compositions used in the respective tubes of the actuator samples and the inner diameter of the tubes r 0 and thickness are shown in Table 3 and Table 4. The tube of Comparative Example 10 had a two-layer structure in which Composition 5 was used for the innermost layer and Composition 1 was used for the outermost layer, and the thickness values ​​of the inne...

Embodiment 6～9 and comparative example 4、5、8、9、11 and 12

[0188] Actuator samples were prepared in a manner similar to Examples 1 to 3 according to the descriptions in Table 3 and Table 4, thereby calculating the cord mesh opening ratio A in a pressurized state, and evaluating the durability of each of the actuator samples sex.

[0189]

[0190]

[0191] It can be understood from the results shown in Table 3 and Table 4 that the actuator samples according to the embodiments of the present disclosure had uniformly high durability.

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Abstract

The present invention addresses the problem of providing an actuator having further increased durability in comparison to conventional actuators. The actuator is characterized by being provided with an actuator body (100) comprising a cylindrical tube (110) which expands and contracts by means of fluid pressure, and also comprising a sleeve (120) which is a cylindrical structure formed by weaving cords oriented in a predetermined direction and which covers the outer peripheral surface of the tube (110), wherein the inner diameter r0 (mm) of the tube (110), the thickness t (mm) of the tube (110), the storage elastic modulus E'(MPa) of the tube (110) at 25 DEG C, and the mesh aperture ratio A of the cords constituting the sleeve (120) in a pressurized state satisfy the following formula (1): 50 <= E' * (t / r0) / A <= 600 ... (1).

Description

technical field [0001] The present invention relates to actuators. Background technique [0002] Conventionally, as an actuator for expanding and contracting a tube, a rubber tube (tubular body) capable of expanding and contracting by using air as a hydraulic fluid and a sleeve (braided reinforcement structure) covering the outer peripheral surface of the tube have been widely used. Pneumatic actuators, ie McKibben type actuators (cf. PTL1 for example). The respective ends of the actuator main body portion constituted by the tube and the sleeve as described above are caulked by using a sealing member formed of metal. The sleeve is a cylindrical structure formed by braiding high tensile strength fiber cords such as polyamide fibers or metal cords to limit the expansion movement of the tube to a specified range. Such a pneumatic actuator as described above, which is used in various fields, is particularly suitable for use as an artificial muscle of a nursing / health care devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/10D03D1/00D03D3/02
CPCD03D1/0043D03D15/283D03D15/41D10B2331/021F15B15/103D03D3/02F15B15/10F15B2215/305F01B19/04
Inventor 兼杉浩之
Owner BRIDGESTONE CORP