| 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. |
| 主权项 |
1. A dust cover for a ball joint comprising:
a spherical head portion formed in one end of a ball stud, the spherical head portion being retained within a socket; a shaft provided in the other end of said ball stud, the shaft being fastened and fixed to a knuckle; a one end large-diameter opening portion fixed and retained to an outer peripheral surface of said socket; the other end small-diameter portion having a rigid ring integrally formed therein, the other end small-diameter portion being retained to said shaft; a film portion connecting said one end large-diameter opening portion and said other end small-diameter opening portion; and the dust cover for the ball joint being made of a rubber-like elastic material, wherein said rigid ring approximately has a rectangular shape in its cross section, and is structured such that one end of said film portion is connected to an outer peripheral surface side of the rigid ring, and the rigid ring is exposed at least in its inner peripheral surface, a first end surface in said socket side and a second end surface in said knuckle side, wherein the dust cover for the ball joint comprises a retainer having a cylinder portion which is fitted and fixed to an outer peripheral surface of said shaft and is provided with an outer peripheral surface facing to said inner peripheral surface, a first flange portion which is provided with an upper end surface facing to said first end surface, and a second flange portion which is provided with a lower end surface facing to said second end surface, and wherein the retainer has at least two kinds of gaskets among three kinds of gaskets including a first gasket which is integrally bonded to said outer peripheral surface coming into contact with said inner peripheral surface in a sealing manner and is made of a rubber-like elastic material, a second gasket which is integrally bonded to said upper end surface coming into contact with said first end surface in a sealing manner and is made of a rubber-like elastic material, and a third gasket which is integrally bonded to said lower end surface coming into contact with said second end surface in a sealing manner and is made of a rubber-like elastic material. |
