Patent ID: 8292506
Filing Date: 2012-10-23
Classification: F16C,G11B,H02K

Abstract:
1. A motor comprising: a shaft and a circular plate extending radially outward from the shaft; a sleeve including a cylinder to rotatably support the shaft and a flange-shaped portion extending radially outward from the cylinder; a stopper engaged with the circular plate such that the flange-shaped portion is held between the circular plate and the stopper; and fluid provided in gaps between the shaft and the sleeve and between the sleeve and the stopper, wherein at least part of the outer surface of the cylinder forms a cylinder seal surface and at least part of the inner surface of the stopper forms a stopper seal surface, wherein the cylinder seal surface and the stopper seal surface extend at a substantially constant angle with regard to the central axis of the shaft, respectively, wherein the cylinder seal surface and the stopper seal surface form a tapered section, and a fluid-air interface is formed in the tapered section, and wherein the stopper seal surface is longer than the cylinder seal surface so as to prevent the fluid leaking along the stopper seal surface.