Variable spring constant type damper filled with viscous fluid
AssigneePolymatech Co., Ltd.
InventorMasatsugu Kato
Life of this patent
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Abstract
A variable spring constant type damper filed with visco fluid which has a great damping effect over a wide frequency band from a low frequency band to a high frequency band and to suppress a resonance magnification at a resonance frequency of a supported body. It is such constituted that the changes are given to a flexible portion (9) made of an elastic body like rubber connecting the flexible portion (9) and a cylindrical portion (8), whereby a spring constant is allowed to depend upon an amplitude.
Claims10
A variable spring constant type damper filled with a viscous fluid in which a container is constituted by a stirring portion having an opening into which a shaft of a supported body is inserted, a cylindrical portion made of a rigid resin or a metal, a flexible portion made of a rubber-like elastic body connecting the opening of the stiring portion for insertion of the shaft and the cylindrical portion, the container being filled with the viscous fluid and sealed with a cap, and the vibration damping is performed with a viscous resistance which is caused by the stirring portion traveling in the viscous fluid in response to a vibration from the external surface of the damper,
- wherein the flexible portion which is deformed with traveling of the stirring portion is comprised of a thick-walled portion and a thin-walled portion, a ratio of the thickness of the thin-walled portion of the flexible portion to the thickness of the thick-walled portion of the flexible portion is 1.0:1.1 to 1.0:5.0.
A variable spring constant type damper filed with a viscous fluid in which the viscous fluid is sealed by a container constituted by a stirring portion having an openings into which a shaft protruded from a supported body is inserted and closely contacting with the shaft, a cylindrical portion made of a rigid resin or a metal, a flexible portion made of a rubber-like elastic body connecting the flexible portion and the cylindrical portion and a cap, and the vibration damping is performed with a viscous resistance which is caused by the stirring portion traveling in the viscous fluid in response to a vibration from the external surface of the damper.
- wherein the wall thickness of the flexible portion is formed in such a manner that a thin-walled walled portion and a thick-walled portion are formed repeatedly by turns in the circumferential direction toward the cylindrical portion from the stirring portion in a radial pattern.
A damper comprising:
- a container, said container defining an opening;
- a viscous fluid in said container;
- a stirring part arranged in said opening of said container and in said viscous fluid;
- a flexible part extending across said opening of said container and connecting said stirring part to said container, said flexible part having a thickness which varies between said container and said stirring part, said thickness varies in a circumferential direction around said stirring part, said thickness alternates repetitively around said stirring part.
A variable spring constant type damper filled with a viscous fluid in which a container is constituted by a stirring portion having an opening into which a shaft of a supported body is inserted, a cylindrical portion made of a rigid resin or a metal, a flexible portion made of a rubber-like elastic body connecting the opening of the stirring portion for insertion of the shaft and the cylindrical portion, the container being filled with the viscous fluid and sealed with a cap, and the vibration damping is performed with a viscous resistance which is causal by the stirring portion traveling in the viscous fluid in response to a vibration from the external surface of the damper,
- wherein the flexible portion which is deformed with traveling of the stirring portion is comprised of a thick-walled portion and a thin-walled portion,
- a change of the wall thickness of the flexible portion are formed so as to vary toward the cylindrical portion from the stirring portion successively or in stages,
- a ratio of the thickness of the thin-walled portion of the flexible portion to the thickness of the thick-walled portion of the flexible portion is 1.0:1.1 to 1.0:5.0.
A variable spring constant type damper filled with a viscous fluid in which a container is constituted by a stirring portion having an opening into which a shaft of a supported body is inserted, a cylindrical portion made of a rigid resin or a metal, a flexible portion made of a rubber-like elastic body connecting the opening of the stirring portion for insertion of the shaft and the cylindrical portion, the container being filled with the viscous fluid and sealed with a cap, and the vibration damping is performed with a viscous resistance which is caused by the stirring portion traveling in the viscous fluid in response to a vibration from the external surface of the damper,
- wherein the flexible portion which is deformed with traveling of the stirring portion is comprised of a thick-walled portion and a thin-walled portion,
- a wall thickness of the flexible portion is formed to have a boundary toward the cylindrical portion from the stirring portion and to switch the thickness thereof,
- a ratio of the thickness of the thin-walled portion of the flexible portion to the thickness of the thick-walled portion of the flexible portion is 1.0:1.1 to 1.0:5,0.
A variable spring constant type damper filled with a viscous fluid in which a container is constituted by a stirring portion having an opening into which a shaft of a supported body is inserted, a cylindrical portion made of a rigid resin or a metal, a flexible portion made of a rubber-like elastic body connecting the opening of the stirring portion for insertion of the shaft and the cylindrical portion, the container being filled with the viscous fluid and sealed with a cap, and the vibration damping is performed with a viscous resistance which is causeed by the stirring portion traveling in the viscous fluid in response to a vibration from the external surface of the damper,
- wherein the flexible portion which is deformed with traveling of the stirring portion is comprised of a thick-walled portion and a thin-walled portion,
- a change in wall thickness of the flexible portion is formed so as to become thin toward a central portion there between from the periphery of the connection of the stirring portion and the cylindrical portion successively or in stages,
- a ratio of the thickness of the thin-walled portion of the flexible portion to the thickness of the thick-walled portion of the flexible portion is 1.0:1.1 to 1.0:5.0.
A variable spring constant type damper filled with a viscous fluid in which a container is constituted by a stirring portion having an opening into which a shaft of a supported body is inserted, a cylindrical portion made of a rigid resin or a metal, a flexible portion made of a rubber-like elastic body connecting the opening of the stirring portion for insertion of the shaft and the cylindrical portion, the container being filled with the viscous fluid and seated with a cap, and the vibration damping is performed with a viscous resistance which is caused by the stirring portion traveling in the viscous fluid in response to a vibration from the external surface of the damper,
- wherein the flexible portion which is deformed with traveling of the stirring portion is comprised of a thick-walled portion and a thin-wailed portion,
- a change in wall thickness of the flexible portion is formed so as to become thin toward a central portion there between from the periphery of the connection of the stirring portion and the cylindrical portion successively or in stages,
- the wall thickness of the flexible portion is formed with a same wall thickness of the peripheral of the connection of the Fog portion and the cylindrical portion,
- wherein a ratio of thin wall thickness versus the thick wall thickness of the flexible portion is 1.0:1.1 to 1.0:5.0.
Dependencies are inferred from the claim text.