# US 2013/0153347 A1 · Damper

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- Number: US 2013/0153347 A1
- Document ID: US20130153347A1
- Status: Published application
- Kind: A1
- Application number: 13/698,214
- Filed: 2011-05-16
- Published: 2013-06-20
- Earliest claimed: 2010-05-19
- Assignees: Nifco Inc.
- Inventors: Hayato Oda; Yoshihisa Takei
- Web page: https://patentgrep.com/patent/US20130153347A1

## CPC

- F16F 9/12: Devices with one or more rotary vanes turning in the fluid any throttling effect being immaterial, {i.e. damping by viscous shear effect only (F16F9/53 takes precedence; pivoting supports for apparatus or articles placed on stands or trestles F16M11/06)}
- C08G 77/04: Polysiloxanes
- C09K 3/1018: {Macromolecular compounds having one or more carbon-to-silicon linkages}
- F16F 9/36: Special sealings, including sealings or guides for piston-rods ({F16F9/325, F16F9/3485 take precedence; arrangements for filling via piston rod sealing or guiding means F16F9/432} ; sealing of moving parts in general F16J15/16 - F16J15/56)
- F16J 15/3284: characterised by their structure; Selection of materials
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

A silicone oil (18) is filled inside a housing (12) of rotation damper (10), and a rotor brake plate (24) provided to be connected to a lower end portion of a rotating shaft (22) of a rotor (20) is rotatably housed inside the housing (12). Also, an O-ring (30) is disposed between the housing (12) and the rotating shaft (22) to prevent the silicone oil (18) from leaking outside of the housing (12). The O-ring (30) is formed by a silicone rubber having a hardness of 25 degrees or above and 45 degrees or less according to the Durometer Hardness Testing (type A) of JIS K 6253.

## Claims

### Claim 1

A damper, comprising:
a housing;
a damper oil filled inside the housing;
a rotor including a rotating shaft with one portion protruding from the housing, and a rotor brake plate connected to a lower end portion of the rotating shaft and rotatably housed inside the housing; and
an annular seal material disposed between the housing and the rotating shaft to prevent the damper oil from leaking outside of the housing,
wherein the annular seal material is formed by a silicone rubber having a hardness of 25 degrees or above and 45 degrees or less according to Durometer Hardness Testing (type A) of JIS K 6253.

### Claim 2 (depends on 1)

A damper according to claim 1, wherein the silicone rubber has a loss tangent of 0.12 or above and 0.25 or less at a temperature of 23° C.±2° C. obtained from a dynamic viscoelastic measurement in a frequency of 1 Hz.