| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent leakage of lubricating oil between an axial end surface of a bush and a dust seal to prevent extrusion of a dust seal caused by lubricating agent supplying pressure. <P>SOLUTION: A dust seal 20 consists of an annular block body 20A, a lip section 20B, a notch groove 20C, and a seal protrusion 20E which are integrally formed together. The seal protrusion 20E is formed to so as to protrude from a radially inner portion of the bush contacting portion 20A2 in a direction axially opposite to the lip section 20B out of the annular block body 20A with rectangular cross-section and makes contact with and cover a chamfered section 14E of the bush 14. When a lubricating agent such as grease is supplied between the bush 14 and a connecting pin 17, the seal protrusion 20E can prevent a part of the lubricating agent from passing around and leaking between the end surface 14D of the bush 14 and the annular contacting surface 20A2 of the dust seal 20. <P>COPYRIGHT: (C)2010,JPO&INPIT |
