| 摘要 |
PROBLEM TO BE SOLVED: To perform constitution of a dust seal firmly fixed at a bottom case and to reduce the number of assembling processes and to reduce the number of parts, SOLUTION: In a dust seal 1 attached to the end part of the inner periphery of a bottom case 10 (an outer cylinder), the outer periphery of a dust seal 1 comprises a metallic reinforcing ring 2 exposed to a fitting part G1; an engagement part 2a engaged with a recessed groove part 11 formed in the end part of the inner periphery of the bottom case 10; and an outer peripheral lip part 4 (a seal means) making contact with an inner peripheral end part outside a recessed groove part 11. |
