公开(公告)号：US06363984B1

公开(公告)日：2002-04-02

申请号：US09426257

申请日：1999-10-25

Applicant: Christopher D Morgan

Inventor： Christopher D Morgan

IPC: B60C1103

CPC classification number: B60C11/0318

Abstract: A tire tread having design cycles or pitches in which the circumferential lengths of repeated pitches are randomly modulated in certain selected sequences to reduce the amount of noise generated by the tire tread when the tire rolls on a road surface. The pitch sequences include three different circumferential pitch lengths including a group having a largest number of medium length (M) pitches, a smallest number of shortest length pitches (S) and a medium number of longest length (L) pitches. In one embodiment, the ratio of the three different pitches are 0.8 for the smallest length pitch (S), 1 for the medium length pitch (M) and 1.2 for the longest length pitch (L). 100 pitch sequences are proposed with the sequence L M S M S L M L M L M L M L M M L M L M L M L M L M being the preferred sequence which provides the most noise reduction. Ninety nine other pitches are also within a range to provide an acceptable level of noise reduction in a tire tread.

Abstract translation: 具有设计周期或间距的轮胎胎面，其中重复间距的圆周长度以某些选定的顺序随机调制，以减少当轮胎在路面上滚动时由轮胎胎面产生的噪声的量。 间距序列包括三个不同的圆周间距长度，包括具有最大数量的中等长度（M）间距，最小数量的最短长度间距（S）和最大长度（L）间距的中等数量的组。 在一个实施例中，对于最小长度间距（S），三个不同间距的比率为0.8，对于中等长度间距（M）为1，对于最长长度间距（L）为1.2。 提出了100个节点序列，具有序列L M S M S L M L M L M L M L M M L M L M L M L M L M是提供最大降噪的优选序列。 九十九个其他间距也在一个范围内，以提供轮胎胎面中可接受的降噪水平。