JPH0636273Y2 - Exhaust pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an exhaust pipe joint used in an internal combustion engine.

[Prior Art] An exhaust pipe joint using a conventional gasket is disclosed in
As shown in Japanese Patent No. 61-244815, a gasket is fitted on the outer side of an inner pipe, an outer pipe extension having a plurality of rows of axial slits is fitted on the outer side, and the extension is clamped. .

In addition, in the case of a type of joint that does not use a gasket, the diameters of the inner pipe and the outer pipe are modified, and the outer pipe is fitted on the outer side of the inner pipe and clamped by a clamp.

[Problems to be Solved by the Invention] A gasket type joint has a certain degree of airtightness and is easy to install and remove, but has a drawback that it is easily removed. If the tightening degree of the clamp is increased to prevent this, the pipe may be deformed. A type of joint that does not use a gasket is difficult to direct, but the airtightness varies, and the fastening part cannot be removed. Therefore, the pipe is cut during removal.

In addition, recently, with the shift to FF in automobiles, it has become common to place the engine horizontally from the space of the vehicle body. For this reason, the rolling of the engine increases the amount of movement of the exhaust pipe in the axial direction, causing problems such as pipe slippage and deterioration of airtightness even in the case of joints with or without conventional gaskets. is doing.

This invention has a high airtightness at the pipe fastening part, and it is easy to attach and detach the pipe at the fastening part, and the resistance force against the axial withdrawal of the pipe at the fastening part (detachment resistance force)
It is an object to provide an exhaust pipe joint having a large size.

[Technical Means for Solving Problems] In order to solve the above-mentioned problems, an exhaust pipe joint of the present invention is an inner pipe having a circumferential bead protruding outward,
A gasket fitted to the end portion side of the bead with the inner pipe, and an outer pipe fitted to the outside of the gasket and having a notch portion having a shape extending in the circumferential direction at the fitting end portion, A clamp that is fitted on the outer side of the outer pipe and tightens the outer pipe to the bead and the gasket, and is fitted to a notch portion provided on the clamp and provided on the outer pipe, and at the inner pipe from the bead. A guide claw located on the opposite side of the end portion is provided, and when a force acts in the pull-out direction of the inner pipe, the guide claw is a notch portion extending in the circumferential direction of the outer pipe. The bead provided on the inner pipe is engaged with the inner pipe to prevent the inner pipe from being pulled out.

[Operation] In the above configuration, even when the gasket is tightened to the inner pipe through the outer pipe by the clamp, the inner pipe is not deformed by the beads, so that the gasket is strongly pressed against the inner pipe, the airtightness is improved, and the variation is small. Become. The clamp prevents the inner pipe and the outer pipe from sticking to each other, and the bead provided on the inner pipe prevents abnormal deformation of the outer pipe, so that the joint can be easily detached during maintenance. Further, the bead of the inner pipe and the guide claw of the clamp fitted in the notch extending in the circumferential direction of the outer pipe come into contact with each other, so that the pull-out resistance of the pipe at the fastening portion is improved.

[Embodiment] The present invention will be described below with reference to FIGS. The fastening portion 1a of the inner pipe 1 is provided with a circumferential bead 2 protruding outward. A gasket 3 is fitted in the fastening portion 1a. The fastening portion 5 of the outer pipe 4 is stepped outward in two steps from the outer pipe 4 and has a large diameter portion 5a.
And a small diameter portion 5b. The large diameter portion 5a is provided with a pair of notches 6 so as to be point-symmetric with respect to the pipe axis. The notch 6 has a step 6b, and is composed of an axial notch 6a extending in the axial direction and a circumferential notch 6c connected to the notch 6a. The fastening portion 1a of the inner pipe 1 is the large diameter portion 5a and the small diameter portion of the fastening portion 5 of the outer pipe 4.
It is inserted in 5b. The large-diameter portion 5a includes a gasket 3, a bead 2 of the inner pipe 1, and a gasket 3 for the bead 2.
It covers a part of the inner pipe 1 on the opposite side. The clamp 7 is made of a material having excellent flexibility and is composed of an arc portion 7a and a clamp portion 7b.
At the left end in the drawing, a pair of left and right guide claws 8 that can move along the notch 6 of the large diameter portion 5a of the fastening portion 5 of the outer pipe 4 are provided so as to face each other and face inward. The clamp 7 extends from the left side (in FIGS. 2 and 3) of the large diameter portion 5a of the outer pipe 4 to the large diameter portion 5a.
The guide claw 8 is first inserted into the axial notch 6a of the notch 6 and moves along the notch 6a, and when it comes into contact with the bead 2 of the inner pipe 1, the clamp 7 is inserted.
Is rotated so that the guide claw 8 moves into the notch 6c in the circumferential direction and contacts the closed end thereof. In this state, the clamp portion 7b is tightened with the screw 9, and the large diameter portion 5a of the fastening portion 5 is tightened to the inner pipe 1.

In the above structure, the gasket 3 is clamped by the clamp 7 to the inner pipe 1 via the large diameter portion 5a of the fastening portion 5 of the outer pipe 4, and the inner pipe 1 is not deformed by the beads 2, so that the airtightness at the fastening portions 1a and 5 is improved. Is improved and the variation is reduced. Since the clamp 7 is made of a material having a small bending rigidity, the inner pipe 1 and the outer pipe 4 are
To prevent sticking with. Also, this sticking prevention and inner pipe 1
Since the bead 2 provided on the outer pipe prevents abnormal deformation of the outer pipe 4, the pipe can be easily detached from the joint during maintenance. The guide claw 8 of the clamp 7 is fitted into the circumferential notch 6c of the notch 6, and the bead 2 of the inner pipe 1 is locked to the guide claw 8 so that the fastening portion 1a, 5 The pullout resistance of the pipe is improved. This pull-out resistance can be adjusted by the mounting position L of the clamp 7. The bending rigidity of the entire fastening portions 1a and 5 can be adjusted by the amount of insertion of the inner pipe 1 into the fastening portion 5.

[Effect] Since the present invention has the above configuration, it has the following excellent effects.

(A) The airtightness of the pipe fastening portion is improved.

(B) It becomes easy to attach and detach the pipe at the fastening portion.

(C) The pulling-out resistance of the pipe at the fastening portion is increased.

[Brief description of drawings]

FIG. 1 shows a front view of one embodiment. 2 and 3 show a side view of the assembly process of the exhaust pipe joint, FIG. 4 (a) shows a front view of the inner pipe, (b) shows a perspective view of the gasket, and (c) shows Shows a front view of the outer pipe,
(D) shows a perspective view of the clamp. 1 ... Inner pipe 2 ... Bead 3 ... Gasket 4 ... Outer pipe 6 ... Notch 7 ... Clamp 8 ... Guide claw

Claims (1)

[Scope of utility model registration request] 1. An inner pipe having a bead in a circumferential direction projecting outward in a fastening portion, a gasket fitted to the end side of the bead by the inner pipe, and a gasket fitted to the outside of the gasket. An outer pipe having a notch portion having a shape extending in the circumferential direction at the fitting end, and a clamp fitted on the outer side of the outer pipe and tightening the outer pipe to the bead and the gasket, and to the clamp. The inner pipe is provided with a guide claw located on the side opposite to the end of the bead and is fitted into the notch provided in the outer pipe, so that force is applied in the pulling-out direction of the inner pipe. The guide claws are engaged with the beads provided on the inner pipe in a state where the guide claws are fitted into the notches extending in the circumferential direction of the outer pipe. Exhaust pipe joint to prevent pull-out of the inner pipe.