CYLINDRICAL VIBRATION ISOLATING DEVICE

• US 20080258364A1
• Filed: 04/16/2008
• Published: 10/23/2008
• Est. Priority Date: 04/17/2007
• Status: Active Grant

• Current Assignee: Yamashita Rubber Kabushiki Kaisha
• Original Assignee: Yamashita Rubber Kabushiki Kaisha
• Inventors: Nishimae, Hironao, Hirano, Yukinobu
• Granted Patent: US 8,167,286 B2
• Time in Patent Office: Days
• US Class Current: 267/136
• CPC Class Codes: F16F 1/38 with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin , i.e. bushing-type hydraulically-damped bushes F16F13/14; suppression of vibrations in rotating systems by making use of elastomeric spring members between rotating elements, driveline torque being transmitted therebetween F16F15/126, by making use of a dynamic damping mass attached to a rotating element by means of elastomeric springs F16F15/14; pivots per se F16C11/00; elastic or yielding bearings or bearing supports F16C27/00; parts of sliding-contact bearings, e.g. bushes F16C33/04
• CPC Class Codes: F16F 7/108 on plastics springs

Abstract

A cylindrical vibration isolating device having an inner cylinder, an outer cylinder surrounding the inner cylinder, an elastic leg having a pair of right and left leg portions to connect the inner cylinder and the outer cylinder and, when viewed in the axial direction of the inner cylinder, being formed in a substantially inverted V-shape while placing the inner cylinder in an intermediate position, and a mass projection being provided in the elastic leg such that the mass projection resonates in a frequency range that the elastic leg causes bending resonance. The mass projection is provided outside of an inner restraint line that is a perpendicular line passing an outermost point of an inner restrained portion that is a connected portion between the inner cylinder and the elastic leg.

Claims

1. A cylindrical vibration isolating device, comprising:

an inner cylinder,

an outer cylinder surrounding said inner cylinder,

an elastic leg having a pair of right and left leg portions to connect said inner cylinder and said outer cylinder and, when viewed in the axial direction of the inner cylinder, being formed in a substantially inverted V-shape while placing said inner cylinder in an intermediate position, and

a mass projection being provided in said elastic leg such that said mass projection resonates in a frequency range that said elastic leg causes bending resonance, wherein said mass projection is provided outside of an inner restraint line that is a perpendicular line passing an outermost point of an inner restrained portion that is a connected portion between said inner cylinder and said elastic leg.

2. The cylindrical vibration isolating device according to claim 1, wherein a center of said mass projection is located outside of an intermediate line that is located in an intermediate position between an outer restraint line connecting an uppermost point and a lowermost point of an outer restrained portion that is a connected portion of said elastic leg with said outer cylinder and a tangential line to an outer periphery of said inner cylinder, extending parallel to said outer restraint line, and that extends parallel to each of said outer restraint line and said tangential line.

3. The cylindrical vibration isolating device according to claim 2, wherein at least half or more of a surface area of said mass projection is located outside of said intermediate line.

4. The cylindrical vibration isolating device according to claim 2, wherein said mass projection is arranged outside of said intermediate line and in an upper area of said elastic leg.

5. The cylindrical vibration isolating device according to claim 4, wherein said mass projection is provided in the vicinity of a cavity formed between an upper edge of said elastic leg and said outer cylinder.