Vibration-proof bush

A vibration-proof bush provided in a center bearing support which supports a center bearing of a propeller shaft, comprising:

• an upper bush configured to be mounted on a vehicle body side,
• the upper bush has a first inner ring of metal, a first outer ring of metal provided concentrically with the first inner ring, and a first elastic body provided integrally with the first inner ring and the first outer ring;
• a lower bush configured to be fitted to the upper bush,
• the lower bush has a second inner ring of metal, a second outer ring of metal provided concentrically with the second inner ring, and a second elastic body provided integrally with the second inner ring and the second outer ring;
• and
• wherein
• the vibration-proof bush includes interference portions configured to interfere with each other in a process of fitting the lower bush to the upper bush, and the interference portions form a fitting-sound generation structure in which a sound is configured to be generated upon fitting the lower bush to the upper bush during temporary assembling,
• the interference portions are defined by a protrusion provided on each of the upper bush and the lower bush, respectively,
• among the protrusions constituting the interference portions, the protrusion provided on the upper bush has an annular protrusion, and the protrusions provided on the lower bush has non-annular protrusions provided in plural at intervals in a circumferential direction,
• each of the plurality of non-annular protrusions includes a first inclined surface in which a distance from a center axis of the lower bush increases as a distance from the upper bush increases, and a second inclined surface in which a distance from the center axis increases as a distance from the upper bush decreases, the second inclined surface being provided closer to the upper bush than the first inclined surface;
• and
• an inclination angle of the first inclined surface with respect to a plane perpendicular to the center axis is larger than an inclination angle of the second inclination surface with respect to the plane perpendicular to the center axis.