| 摘要 |
A dust seal (20) is provided with a tubular fitting portion (20A), a bush end surface abutting portion (20B), a lip portion (20D) and a sealing projection (20E) integrally formed. The sealing projection (20E) is formed to project in an axially opposite direction to the lip portion (20D) from a radial inner section of the bush end surface abutting portion (20B) and abuts against a chamfered portion (14E) of a bush (14) in such a manner as to overlap the chamfered portion. Therefore, at the time of supplying lubricant such as grease between the bush (14) and a connecting pin (17), the sealing projection (20E) can prevent a part of the lubricant from entering between an end surface (14D) of the bush (14) and the bush end surface abutting portion (20B) of the dust seal (20) to maintain a sealed state therebetween. In consequence, the dust seal (20) can be stably held on the inner peripheral side of a boss member (12), preventing the pulling-out of the dust seal (20) by a lubricant agent supplying pressure.
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