| 摘要 |
Herein disclosed is a boot (13) for a universal joint, which is made of a high-molecular elastomer, in which bellows having three or more ridges (14, 16, 17) are extended between a larger and a smaller ring portion (11, 12) and in which a valley (15) is formed between the first ridge (14) from the larger side of the bellows and the larger ring portion (11). In this boot (13), the crest of the first ridge (14) has its inner circumference located outside of the imaginary circumference of the frustum of a cone (c), which is formed by joining the end portion of the larger ring portion (11) at the side to be connected to the bellows and the crest of the second ridge (16). As a result, the wears of the ridges (especially of the first ridge (14)) due to their mutual contacts are not promoted so that the boot (13) can have its durability improved. |
