| 摘要 |
The purpose of the present invention is to provide a ball joint dust cover that has favorable sealing functionality and, in a low temperature environment, can suppress the occurrence of the so-called small diameter opening part opening-phenomenon, and can effectively prevent reduction in the sealing functionality of the small diameter opening part and infiltration from the outside of gravel and dust into the dust cover. In order to achieve the foregoing, provided is a ball joint dust cover made of a rubbery elastic material and provided with a one-end small diameter opening part with which a hard ring is formed integrally, wherein the hard ring is sandwiched by a retainer having a three-sided box shaped gasket. |
