JPS6131133Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the connection structure of an exhaust pipe used in a transverse engine vehicle or the like.

Generally, in transverse engine vehicles such as those mentioned above, it is necessary to extend the exhaust pipe in a direction perpendicular to the axial direction of the crankshaft. A connection structure that allows free swinging and sliding is also adopted.

As shown in FIG. 1, the conventional connection structure for this type of exhaust pipe is to form a seal flange 2 by press molding near the end of one exhaust pipe 1 connected to the engine side, and A sealing ring 3 having a spherical sliding surface 3a on the outer surface is fitted to the exhaust pipe 4, while a spherical sliding surface 3a is fitted to the tip of the other exhaust pipe 4.
A fitting part 5 having a spherical sliding surface 5a having the same radius of curvature is provided, and the sealing ring 3 and the fitting part 5 are slidably and swingably fitted, and both exhaust pipes 1, 4 are fitted. Connection flanges 6 and 7 are fitted and fixed to each other.
A conical spring 10 is connected to the bolt 8 and the nut 9 so that they can be relatively approached and separated, and is normally interposed between the head of the bolt 8 and the connecting flange 7.
A device in which both the connecting flanges 6 and 7 are biased toward each other is known (see Japanese Patent Laid-Open No. 53-54615 and US Pat. No. 4,097,071).

However, when the above-mentioned conventional connection structure is adopted, the exhaust pipe is usually exposed and placed below the floor panel of the vehicle, so muddy water and sand can enter between the connecting flanges 6 and 7. enters the sliding surface between the sealing ring 3 and the fitting part 5 during relative rocking or axial sliding between the exhaust pipes 1 and 4, and the wear resistance of the sealing ring 3 deteriorates.
There was a problem that significantly reduced durability.

The present invention was made to solve such conventional problems, and foreign matter such as muddy water or sand tries to enter between the spherical sliding surface of the sealing ring and the sliding surface that slides thereon. It is an object of the present invention to provide an exhaust pipe connection structure for a vehicle engine that can trap the exhaust gas through an annular groove provided in a sealing ring and guide it downward for exhaust.

Hereinafter, the present invention will be described in more detail based on illustrated embodiments.

As shown in FIG. 2, in the present invention, an annular groove 13 is provided around the outer periphery of the proximal end of the sealing ring 12 that is fitted to the outer periphery of the distal end of one of the exhaust pipes 11. Foreign matter such as muddy water or sand that enters between a connecting flange 14 fixed to one exhaust pipe 11 by welding and a connecting flange 16 fixed to the other exhaust pipe 15 by welding is guided downward. .

The sealing ring 12 is supported with its proximal end surface in contact with the connection flange 14,
It has a spherical sliding surface 13a whose radius of curvature with respect to the axis of the exhaust pipe 11 gradually decreases from the base end side to the distal end side. A sliding surface 15a formed by expanding into a spherical shape corresponding to the spherical sliding surface 13a is fitted, and basically, by this fitting, both exhaust pipes 11 and 15 are connected so as to be able to freely slide relative to each other. do.

Both of the exhaust pipes 11 and 15 are connected to holes 14 provided in one of the connecting flange 14, similar to the conventional example shown in FIG.
Screw the threaded portion 17a at the tip onto the intermediate body portion 1.
7b is provided in the other connecting flange 16 through-hole 1
With the conical coil spring 19 fitted between the head 17c of the bolt 17 that is loosely fitted into the bolt 17 and the reinforcing plate 18 that is applied to the outside of the other connecting flange 16, the bolt 17 is tightened with the nut 20. The connection is made by fastening to the flange 14. The spring force of the coil spring 19 keeps the sliding surface 15a of the other exhaust pipe 15 in close contact with the spherical sliding surface 12a of the sealing ring 12 at all times.

As mentioned above, in the present invention, the spherical sliding surface 13a
An annular groove 1 is formed on the outer periphery of the base end of the sealing ring 12, which is in sliding contact with the slidable surface 15a of the other exhaust pipe 15.
3 is provided, so even if foreign matter such as muddy water or sand enters from the upper part of the connection part, the foreign matter can be guided downward by the annular groove 13 and dropped, preventing foreign matter from accumulating. Therefore, even when both exhaust pipes are displaced relative to each other, foreign matter does not enter between the spherical sliding surface 13a and the sliding surface 15a, thus improving the durability of the sealing ring 12. In addition, since it is only necessary to provide the annular groove 13, the objective can be achieved with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing a conventional exhaust pipe connection structure for a vehicle engine, and FIG. 2 is a sectional view of a main part showing an exhaust pipe connection structure according to an embodiment of the present invention. 11... One exhaust pipe, 12... Sealing ring, 13... Annular groove, 13a... Spherical sliding surface,
14... Connection flange, 15... Other exhaust pipe,
15a...Sliding surface, 16...Connection flange, 1
7... Bolt, 19... Coil spring, 20
...Natsuto.

Claims (1)

[Claim for Utility Model Registration] A sealing ring is interposed between one exhaust pipe and the other exhaust pipe, and a spring is provided to bring both exhaust pipes close to each other, so that these exhaust pipes are slidably connected. In the exhaust pipe connection structure for a vehicle engine, a sealing ring whose base end has a spherical sliding surface with a larger diameter than the tip and an annular groove formed on the outer periphery of the base end is fitted into one exhaust pipe, and the other in the exhaust pipe of
An exhaust pipe connection structure for a vehicle engine, characterized in that a sliding surface that slides on the spherical sliding surface is formed.