US 7,093,861 B2 · Exhaust pipe joint structure and coil spring used in the same

Abstract

An automobile exhaust-pipe joint structure and a coil spring for use therein. The exhaust pipe connection structure includes a first exhaust pipe having a first flange section, a second exhaust pipe having a second flange section, a ball joint section for connecting the first and second exhaust pipes flexibly, and coupling mechanisms provided at a plurality of positions of the first and second flange sections. One exemplary coupling mechanism includes a bolt member penetrating the first flange section and being secured, at one end part thereof, to the second flange section, and a coil spring of deformed cross-section interposed between the other end part of the bolt member and the first flange section, wherein the cross-section of a wire is reduced in diameter, in the compressing direction with a dimensional ratio between the short diameter and long diameter thereof being in the range of 1.1–2.6.

Claims14

Dependent claims

an automobile exhaust-pipe joint structure, comprising:

a first exhaust pipe having a first flange section at one end;
a second exhaust pipe having a second flange section at one end;
a ball joint mechanism disposed at the ends where the first flange section of the first exhaust pipe and the second flange section of the second exhaust pipe are formed to flexibly join the first exhaust pipe and the second exhaust pipe together;
and
joint mechanisms disposed in a plurality of positions at the first flange section and the second flange section, for joining the first flange section and the section flange section together;
wherein one of the joint mechanisms includes:
a bolt, one end of which is fixed to the second flange section through the first flange section;
and
a coil spring disposed between the other end of the bolt and the first flange section;
wherein the cross section of the wire rod of the coil spring is a deformed cross section having a minor axis and a major axis such that it is small in diameter in the direction in which the coil spring is compressed, the dimension ratio of the major axis to the minor axis being within the range from 1.1 to 2.6.

7 more elements

A coil spring used as a coil spring in an automobile exhaust-pipe joint structure, wherein the automobile exhaust-pipe joint structure comprises a first exhaust pipe having a first flange section at one end;

a second exhaust pipe having a second flange section at one end;
a ball joint mechanism disposed at the ends where the first flange section of the first exhaust pipe and the second flange section of the second exhaust pipe are formed to flexibly join the first exhaust pipe and the second exhaust pipe together;
and joint mechanisms disposed in a plurality of positions at the first flange section and the second flange section, for joining the first flange section and the second flange section together;
wherein one of the joint mechanisms includes:
a bolt, one end of which is fixed to the second flange section through the first flange section;
and a coil spring arranged between the other end of the bolt and the first flange section;
wherein the coil spring is formed by winding a wire rod in coiled form;
and the cross section of the wire rod of the coil spring is a deformed cross section having a minor axis and a major axis such that it is small in diameter in the direction in which the coil spring is compressed, the dimension ratio of the major axis to the minor axis being within the range from 1.1 to 2.6.

5 more elements

Dependencies are inferred from the claim text.

Exhaust pipe joint structure and coil spring used in the same

Life of this patent

Exhaust pipe joint structure and coil spring used in the same

Life of this patent

Abstract

Claims14