Vibration-isolating bushing

• US 20040046298A1
• Filed: 08/25/2003
• Published: 03/11/2004
• Est. Priority Date: 09/05/2002
• Status: Active Grant

• Current Assignee: Seiya Takeshita, Yasukuni Wakita
• Original Assignee: Seiya Takeshita, Yasukuni Wakita
• Inventors: Wakita, Yasukuni, Takeshita, Seiya
• Granted Patent: US 6,899,323 B2
• Time in Patent Office: Days
• US Class Current: 267/293
• CPC Class Codes: F16F 1/387 comprising means for modifying the rigidity in particular directions spherical or conical sleeves F16F1/393

Abstract

In a so-called bulge type of vibration-isolating bushing wherein an annular cover made of a synthetic resin is provided as a bulge portion on an outer periphery of an axially central part of an inner cylinder, such a vibration-isolating bushing that is superior in buckling strength in the axial direction of the inner cylinder, low-cost, and advantageous in environmental aspect, while preventing any displacement of the annular cover is provided. To that end, a knurling is provided on an outer periphery of an axially central part of a metal pipe constituting the inner cylinder, preferably, together with a serration on an axial edge of the metal pipe; and the annular cover is secured to the outer periphery of the metal pipe inclusive of the knurling by molding of a synthetic resin.

Claims

1. A vibration-isolating bushing comprising an inner cylinder having a bulge portion bulging out in an axially central area thereof in an axially square direction, an outer cylinder disposed outside of the inner cylinder in a spaced relation, and a rubber-like elastomer interposed between the inner cylinder and the outer cylinder, wherein the inner cylinder is composed of a metal pipe and an annular cover constituting the bulge portion provided on an outer periphery of an axially central part of the metal pipe;

the metal pipe has a knurling provided on the outer periphery of the axially central part thereof;

the annular cover is secured to the outer periphery of the metal pipe inclusive of the knurling by molding of a synthetic resin; and

the rubber-like elastomer is vulcanization molded to the inner cylinder at its outer periphery so as to enwrap the cover therein.

2. The vibration-isolating bushing as set forth in claim 1, wherein the metal pipe is provided with a serration at least at its one axial edge surface and hardened by quenching.

3. The vibration-isolating bushing as set forth in claim 2, wherein the quenching is cementation quenching.