| 摘要 |
PROBLEM TO BE SOLVED: To allow an attaching engaging part of a plastic seal member to favorably contact closely with an inner face of a seal engaging groove, and make creep deformation hardly generated in the plastic seal member, maintain sealing performance for a long period, and enhance productivity. SOLUTION: A single-row deep groove ball bearing 21 is provided with an annular seal plate 23 for seal between an inner ring and the outer ring. The attaching engagent part provided with a sealing annular protrusion 33 for sealing an inner circumferential end edge of the outer ring 26 by contacting closely with an inner face 31b of a seal-engaging groove 31, and an elastic protruded piece 35 for generating elastic rebound force for press-enrgizing the annular protrusion 33 toward the inner face 31b by abutting to an outer face 31c of the seal-engaging groove 31 under an elastically deformed condition is formed in an outer circumferential part 23a of the seal plate 23 held engagedly to the seal-engaging groove 31 of the outer ring 26. The elastic protruded piece 35 of which the wall thickness is thickened gradually from a base part toward a tip part is provided with a flat abutting face 35a in the tip part. |
