Vibration insulator
AssigneesNissan Motor Co., Ltd., Bridgestone Corporation
InventorsTakaaki Uno, Takuya Dan, Michihiro Orikawa
Life of this patent
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Abstract
An annular element is disposed within an outer tubular member of an insulator device in a manner to surround a recessed elastomeric body interposed between the outer tubular member and an inner tubular member. A channel formed in the outer periphery of the annular element is closed by the outer tubular member to define a passage which fluidly intercommunicates chambers defined by the recesses formed in the elastomeric body. The channel is sufficiently long and robust as to ensure the desired vibration damping and working life of the unit.
Claims12
A vibration insulator comprising:
- a rigid inner tubular member having an outer circumference;
- a rigid outer tubular member having an inner circumference;
- an elastomeric body disposed between, and secured to, the outer circumference of said inner tubular member and the inner circumference of said outer tubular member, said elastomeric body being formed with recesses therein;
- means including said recesses defining at least first and second closed fluid chambers which hold a working fluid;
- and
- fluid passage defining means providing a curved channel having rigid walls and extending circumferentially about the full inner circumference of said outer tubular member to connect said chambers and provide fluid communication therebetween, whereby vibrations producing relative motion between said inner and outer tubular members distorts said elastomeric body and causes working fluid to flow between said fluid chambers through said channel, which has an effective length to dampen the vibrating flow of working fluid through said channel.
An insulator as claimed in claim 10 said fluid passage defining means comprising a rigid annular element disposed within said rigid outer tubular member and surrounding said elastomeric body, said rigid annular member having said curved channel formed in an outer periphery thereof, said channel being closed by said outer tubular member to define a passage which fluidly communicates said closed fluid chambers.
A vibration insulator comprising:
- a rigid inner tubular member;
- a rigid outer tubular member;
- an elastomeric body disposed between, and secured to, said inner and outer tubular members, said elastomeric body being formed with recesses therein;
- means including said recesses defining at least first and second closed fluid chambers which hold a working fluid;
- and
- fluid passage defining means providing a curved channel having rigid walls and extending circumferentially about an inner circumference of said rigid outer tubular member to connect said chambers and provide fluid communication therebetween, said curved channel having a substantially helical configuration.
A vibration insulator comprising:
- a rigid inner tubular member;
- a rigid outer tubular member;
- an elastomeric body disposed between, and secured to, said inner and outer tubular members, said elastomeric body being formed with recesses therein;
- means including said recesses defining at least first and second closed fluid chambers which hold a working fluid;
- and
- fluid passage defining means comprising:
- a rigid annular element disposed within said rigid outer tubular member and circumferentially surrounding said elastomeric body;
- a curved channel formed in an outer circumference of said rigid annular element, said curved channel being closed by said outer tubular member to define a circumferential passage which fluidly communicates said closed fluid chambers, said curved channel having an effective length longer than the circumference of said rigid annular element, whereby vibrations producing relative motion between said inner and outer tubular members distorts said elastomeric body and causes working fluid to flow between said fluid chambers through said channel, which has an effective length to dampen the vibrating flow of working fluid through said channel.
Dependencies are inferred from the claim text.