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Cylinder device

An inner cylinder and electrode technology, applied in the direction of springs, shock absorbers, spring/shock absorbers, etc., can solve the problems of adhesion to electrodes, particles, and particles attached to electrodes, so as to prevent the deposition of particles, Effect of suppressing decline in attenuation characteristics

Inactive Publication Date: 2021-08-06
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The device described in Patent Document 1 provides a solution to the problem of precipitation of particles contained in electrorheological fluid compositions, but cannot solve the problem of particle adhesion to electrodes
[0014] Although the cartridge device described in Patent Document 2 is equipped with an adjustment valve for adjusting the damping force characteristics, it cannot solve the problem of particles adhering to the electrodes.

Method used

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  • Cylinder device
  • Cylinder device
  • Cylinder device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] [Insulation]

[0078] exist figure 2 The positions shown are provided with insulating layers 51 , 52 . Carbon steel was used as a material for the electrodes, and polyamide was used as a material for the insulating layers 51 and 52 . The thickness of the insulating layer 51 is about 100 times the thickness of the insulating layer 52 .

[0079] [Electroviscous fluid]

[0080] Electroviscous fluid in which polyurethane-based microparticles are dispersed in silicone oil is used. In addition, the average particle diameter of the polyurethane microparticles measured by the laser diffraction method was 4.2 μm, and the viscosity of the silicone oil was 5 cP.

Embodiment 2

[0093] The same test as in Example 1 was performed except that a fluorine-based resin was used as the material of the insulating layer.

Embodiment 3

[0095] The insulating layer was tested in the same manner as in Example 1, except that the base was formed of polyamide, and then the surface was coated with a fluorine-based surface treatment agent.

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PUM

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Abstract

The invention provides a cylinder device includes a piston rod having a piston; a first electrode which constitutes an inner tube and into which the piston rod is inserted; a second electrode which constitutes an outer tube and which is provided in such a way as to face an outer circumferential surface of the first electrode; a base shell in which the first electrode and the second electrode are accommodated; an electrorheological fluid filling the inside of the base shell; and a voltage applying unit for applying a voltage between the first electrode and the second electrode, wherein an outer surface insulating layer is provided on an outer circumferential surface of the second electrode. As a result, accumulation of particles in a region in which the speed of the electrorheological fluid filling the cylinder device is low can be prevented, and a deterioration in the attenuation characteristics of the cylinder device can be suppressed.

Description

technical field [0001] The present invention relates to cartridge devices. Background technique [0002] Generally, a vehicle has a cylinder device (cylinder) that attenuates vibration during running in a short time and improves ride comfort and running stability. [0003] As a cartridge device, a device using an electroviscous fluid (electrorheological fluid composition: ERF) is known in order to control the damping force according to the state of the road surface or the like. [0004] Patent Document 1 describes a device for controlling the transmission of force generated by placing an electrorheological fluid composition containing particles having an electrorheological effect between electrodes in an electrically insulating medium separated from each other by Furthermore, two or more types of media having different specific gravities are formed, and at least one type of the electrically insulating media has a specific gravity larger than that of the particles. It is al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F9/53F16F9/32F16F9/46
CPCF16F9/532F16F9/185
Inventor 石井聪之平尾基裕
Owner HITACHI ASTEMO LTD