Bearing member, and vibration damping device using same

Patent metadata

Field	Value
Publication number	US-10634208-B2
Application number	US-201615759671-A
Country	US
Kind code	B2
Filing date	Sep 15, 2016
Priority date	Sep 15, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

An object of the present invention is to provide a vibration damping device including a bearing member capable of achieving simplification of configuration in the vibration damping device, reducing frictional force during operation, and having an excellent wear resistance. A vibration damping device of the present invention includes a bearing structure, in which a metal bush (bearing member) has a resin layer on a side defined as a friction sliding surface of a base member, the resin layer includes polytetrafluoroethylene and a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin, and the metal bush is lubricated by a magneto-rheological fluid composition.

First claim

The invention claimed is:

1. A vibration damping device serving as a variable damping force damper, the vibration damping device comprising:
a cylinder;
a piston rod inserted into the cylinder;
a piston connected to the piston rod and disposed axially slidably in the cylinder;
a first liquid chamber and a second liquid chamber partitioned in the cylinder by the piston and filled with a magneto-rheological fluid composition;
a communication hole formed in the piston so as to communicate the first liquid chamber and the second liquid chamber; and
an electromagnetic coil for applying a magnetic field to the magneto-rheological fluid composition flowing through the communication hole, wherein
the piston rod is slidably supported by a bearing member disposed in the cylinder,
the bearing member comprises a resin layer on a side defined as a friction sliding surface of a base member,
the resin layer comprises polytetrafluoroethylene and a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin,
the resin layer further comprises a solid lubricant and/or an inorganic filler,
the base member is made of a steel material,
the resin layer is impregnated and coated on a porous metal layer formed on the base member, and
the bearing member is lubricated by the magneto-rheological fluid composition.

2. The vibration damping device according to claim 1 , further comprising a rod guide which seals one end of the first liquid chamber, and the bearing member is disposed with the rod guide.

3. The vibration damping device according to claim 2 , wherein the rod guide includes a base portion made of metal, and the bearing member is disposed between the base portion of the rod guide and the piston rod.

Assignees

• Honda Motor Co Ltd
• Daido Metal Co
• Daldo Metal Company Ltd

Inventors

• Komori Kentaro
• Endo Daijiro
• KUSHIYA Masato
• Suzuki Mikio

Classifications

• F16F2224/045

  magnetorheological · CPC title

• F16F9/535

  Magnetorheological [MR] fluid dampers (springs comprising magnetorheological [MR] elastomers F16F1/361) · CPC title

• F16C33/109

  Lubricant compositions or properties, e.g. viscosity · CPC title

• F16F2230/0052

  Physically guiding or influencing · CPC title

• F16C2326/05

  Vehicle suspensions, e.g. bearings, pivots or connecting rods used therein · CPC title