Title:
VISCOUS DAMPER
Document Type and Number:
Japanese Patent JP2022131575
Kind Code:
A
Abstract:
To provide a viscous damper which generates a damping force according to earthquake vibration exceeding assumption on design without deteriorating base isolation performance against earthquake vibration assumed in the normal design with a simple structure.SOLUTION: A viscous damper 10A includes: a cylinder 12 in which a working fluid V is enclosed; a piston rod 14 disposed on an axis of the cylinder 12; and a piston 16 connected to the piston rod 14. Multiple inner diameter parts having different inner diameters are provided on an inner peripheral surface 1202 of the cylinder 12. The multiple inner diameter parts has a large inner diameter part 30 and small inner diameter parts 32 each having an inner diameter smaller than that of the large inner diameter part 30. The large inner diameter part 30 is disposed at a center part in an axial direction of the cylinder 12, and the small inner diameter parts 32 are provided at both sides of the large inner diameter part 30. The large inner diameter part 30 and each small inner diameter part 32 located adjacent to each other in the axial direction of the cylinder 12 are connected by an inclined surface 34 which connects inner peripheral surfaces of these inner diameter parts.SELECTED DRAWING: Figure 2
Inventors:
TANAKA RYOICHI
FENG DEMIN
SASAKI YASUHITO
FENG DEMIN
SASAKI YASUHITO
Application Number:
JP2021030581A
Publication Date:
September 07, 2022
Filing Date:
February 26, 2021
Export Citation:
Assignee:
FUJITA CORP
International Classes:
F16F9/19; E04H9/02; F16F15/023
Attorney, Agent or Firm:
Shigeru Noda
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