Patent ID: 7895748
Filing Date: 2011-03-01
Classification: B29C,F16C,Y10T

Abstract:
1. A method of producing a resin coated bearing by forming a coating member of a synthetic resin on an outer peripheral surface of a metallic outer race of a ball bearing by insert-molding, the outer race comprising a projection on one end on the outer peripheral surface thereof, and a sealing fitting recess on the one end side on an inner peripheral surface thereof, the sealing fitting recess including an outer projection on the one end side that projects inward of the outer race, wherein after the outer race is fitted onto a columnar portion provided on a first die of forming dies by inserting the columnar portion into a hole defined by the inner peripheral surface of the outer race, a second die of the forming dies is combined with the first die to cover the outer race so that: a cavity is defined by an outer periphery of the outer race, the first and second dies; a disk space in the form of a disk as viewed in plan view is defined between the columnar portion of the first die and the second die; and a film gate is defined by the projection on the outer peripheral surface of the outer race and the second die so as to provide communication between a whole edge of an outer periphery of the disk space and the cavity, and wherein a molten resin is injected toward a substantially central portion of the disk space from a sprue formed in the second die, and is led to the disk space from a pin gate which is formed at a lower end of the sprue, and then flows into a space between the columnar portion and the sealing fitting recess to form a sealing runner part, and into the cavity through the film gate to form the coating member.