| 摘要 |
A seal ( 21 ) is constituted by an outer lip portion ( 22 ) to be held in abutting engagement with an outer link portion ( 9 ) of a crawler belt ( 7 ), an inner lip portion ( 23 ) to be held in abutting engagement with a bush ( 11 ), and an interconnecting bridge portion ( 24 ) bridged and connected between the outer and inner lip portions ( 22, 23 ). The outer lip portion ( 22 ) on the side of track link, the inner lip portion ( 23 ) on the side of bush, and outer bridge portion ( 24 A) and inner bridge portion ( 24 B) of the interconnecting bridge portion ( 24 ) are formed in thicknesses (T 1 , T 2 , T 1 ' and T 2 '), respectively, which are in the relations of (T 2≈ T 2 '>T 1 ≈T 1 '). A maximum outside diameter portion ( 24 C) of the interconnecting bridge portion ( 24 ) is located radially outward of a median point between inner and outer peripheral ends of the lip portion ( 23 ) on the side of bush. The inner lip portion ( 23 ) as a whole is uniformly pressed against an end face ( 11 A) of the bush ( 11 ) by the interconnecting bridge portion ( 24 ).
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