| 摘要 |
PURPOSE:To dispense with superfluous operations and any parts other than a sealing member, and to reduce such a force as required for expansion or contraction of an expansion shaft as preventing muddy water or the like from penetrating into a spline tube 9 with certainty. CONSTITUTION:The inside and outside of a spline tube 9 are interconnected to each other via those of first, second and third clearances 20, 25 and 28. Each inner circumferential edge of first seal lips 29, 29 formed on an inner circumferential surface of a support cylinder part 23 of a sealing member 19 comes into contact with an outer circumferential surface of the spline tube 9, closing the third clearances 28, 28. An inner circumferential edge of a second seal lip 30 formed in the inner circumferential edge of a bending part 24 comes into contact with the outer circumferential surface of a spline shaft 10. The first seal lip 29 is easy to transform in a direction where a seal is broken by a pressure variation as compared with the second seal lip 30. |
