JP2008190370A - Finisher structure of exhaust system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a finisher structure of an exhaust system capable of preventing the exhaust system from being pushed to a vehicle front part side in collision of a vehicle rear part. <P>SOLUTION: A finisher body 2 attached to a tail pipe 1 of the exhaust system is fixed to the tail pipe 1 movably to the vehicle front part side in collision of the vehicle rear part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improved exhaust system finisher.

Conventionally, a technique of a finisher structure that is attached to a tail pipe of an exhaust system has been publicly known (see Patent Documents 1 and 2).
JP 2005-9400 A JP 2005-9399 A

However, in the conventional invention, when the collision occurs at the rear of the vehicle, the collision object comes into contact with the finisher body, so that the entire exhaust system is pressed to the vehicle front side through the finisher body. For example, there is a problem that stress tends to concentrate at the base of the tail pipe and the main muffler.
Accordingly, the above-described portion where stress is likely to concentrate must be dealt with by increasing its rigidity, which increases the manufacturing cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an exhaust system finisher structure that can prevent the entire exhaust system from being pushed to the front side of the vehicle in the event of a vehicle rear collision. Is to provide.

  The invention according to claim 1 of the present invention is characterized in that the finisher body mounted on the tail pipe of the exhaust system is fixed so as to be movable forward of the vehicle with respect to the tail pipe at the time of a collision of the rear part of the vehicle.

  According to the first aspect of the present invention, the finisher main body mounted on the tail pipe of the exhaust system is fixed so as to be movable forward of the vehicle with respect to the tail pipe at the time of the vehicle rear collision. Sometimes it is possible to prevent the entire exhaust system from being pushed forward of the vehicle.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
1 is an overall view showing an exhaust system of Embodiment 1 of the present invention, FIG. 2 is a side view showing a finisher structure of the exhaust system of Embodiment 1, and FIG. 3 is a sectional view taken along line S3-S3 in FIG. 4 is a diagram for explaining the operation of the first embodiment.

First, the overall configuration will be described.
As shown in FIG. 1, in the exhaust system of the first embodiment, the exhaust gas flows downstream through an engine a1, an exhaust manifold a2, a catalytic converter a3, a connecting pipe a4, a sub-muffler a5, a connecting pipe a6, and a main muffler a7. The finisher body 2 is mounted on a tail pipe 1 for discharging exhaust gas from the main muffler a7 to the outside of the rear of the vehicle.

Hereinafter, the structure of the finisher body 2 will be described in detail.
As shown in FIG. 2, the finisher main body 2 includes a cylindrical straight pipe portion 3 supported on the outer periphery of the rear end portion 1 a of the tail pipe 1, and a pipe flared from the straight pipe portion 3 toward the vehicle rear side. Is provided with a substantially cylindrical tube expansion portion 4 that is folded back outward.
In addition, about the detailed shape of the site | part of the pipe expansion part 4, it can set suitably.

Further, a part of the outer periphery of the straight pipe portion 3 is fastened by a C-type clamp 5 fastened by a bolt B1, whereby the tail pipe 1 and the straight pipe portion 3 are fixed with a predetermined restraining force.
A circular opening hole 6 is formed in the C-shaped clamp 5, and a hemispherical dimple part 7 projecting radially outward from the outer periphery of the straight pipe part 3 is fitted into the opening hole 6. ing.

Further, the straight pipe portion 3 is formed with a slit 8 that is linearly cut from the front end portion 3a to a predetermined depth.
Note that the shape, formation position, and number of the slits 8 can be set as appropriate.

  A straight sliding groove 9 is opened in the straight pipe portion 3 on the vehicle front side of the C-shaped clamp 5.

In addition, orifice-like stopper portions 10 and 10 are provided on the front side of the sliding groove 9 in the vehicle, and the stopper portions 10 and 10 project outward from the outer periphery of the tail pipe 1 shown in FIG. The cylindrical pin 11 is locked.
Note that an opening may be provided in the tail pipe 1, and a separate pin 11 may be crimped and fixed thereto.

  Further, a crank-like insertion groove 12 is cut out to the front end portion 3 a of the straight pipe portion 3 on the vehicle front side of the stopper portions 10 and 10 continuously from the sliding groove 9.

  Thereby, the finisher main body 2 is supported by the tail pipe 1 in a state in which the movement toward the front side of the vehicle and the movement in the rotation direction are suppressed by the pins 11.

Next, the operation will be described.
When the finisher body 2 is mounted on the tail pipe 1 configured as described above, the C-type clamp 5 is temporarily fixed to the finisher body 2 in advance, and the pin 11 of the tail pipe 1 is inserted into the insertion groove 12 of the finisher body 2. The pin 11 is brought into contact with the front side of the stoppers 10 and 10 so that both of them are positioned.
At this time, movement and rotation of the finisher body 2 toward the vehicle front side can be suppressed by the pins 11.

Subsequently, the dimple portion 7 is fitted into the opening hole 6 of the C-type clamp 5 so that both are positioned, and the finisher body 2 and the tail pipe 1 are fixed with a predetermined restraining force by fastening the bolt B1. To do.
At this time, the straight pipe portion 3 can be slightly reduced in diameter by the slit 8 to make the binding force of the C-type clamp 5 uniform.

  When the impact force F (see FIG. 2) due to the collision object is input to the finisher body 2 at the time of the collision of the rear part of the vehicle, the pin 11 pushes and spreads the stopper portions 10 and 10 apart to slide. As shown in FIG. 4, the finisher main body 2 moves toward the front side of the vehicle while absorbing the impact force due to this deformation, as shown in FIG. Transmission to the whole exhaust system can be prevented.

It should be noted that the dimension and shape such as the length L1 (see FIG. 2) and the width W1 (see FIG. 2) of the sliding groove 9 that is the moving distance of the pin 11 (also the moving distance of the finisher body 2) can be set as appropriate. However, before the finisher body 2 is restrained from moving forward of the vehicle by the pin 11 coming into contact with the rear end position of the sliding groove 9, the bumper at the rear of the vehicle body (not shown) is crushed to absorb the impact force F. It is preferable to set so.
Further, it is preferable that the pin 11 and the sliding groove 9 slide to absorb the impact force using a deformation force or a friction force.

  Further, in the first embodiment, even when the finisher body 2 moves to the vehicle rear side for some reason, the pin 11 is regulated by contacting with a part 13 (see FIG. 2) of the insertion groove 12, thereby the finisher body 2. Can be prevented from falling off.

Next, the effect will be described.
As described above, in the exhaust system finisher structure according to the first embodiment, the finisher body 2 mounted on the tail pipe 1 of the exhaust system is placed on the vehicle front side with respect to the tail pipe 1 when the rear part of the vehicle collides. Since the vehicle is fixed so as to be movable while absorbing the impact force, it is possible to prevent the entire exhaust system from being pushed to the front side of the vehicle when the rear of the vehicle collides.

  Further, a finisher body 2 provided in the exhaust tail pipe 1 so as to be slidable in the axial direction, a sliding groove 9 opened in the axial direction on the outer periphery of the finisher body 2, and a radial direction from the outer periphery of the tail pipe 1 A pin 11 that protrudes outward and is locked to the vehicle front side of the stopper portions 10 and 10 formed in the sliding groove 9 to place the finisher main body 2 at a predetermined position is provided. By releasing the locking of the pin 11 and the stopper portions 10 and 10, the finisher body 2 can be moved to the front side of the vehicle with respect to the tail pipe 1 while the pin 11 is slid in the sliding groove 9. With the structure, it is possible to prevent the entire exhaust system from being pushed toward the front side of the vehicle at the time of a collision at the rear of the vehicle.

In the conventional invention, the mounting position is limited so that the finisher body does not act as a rigid body in the event of a collision at the rear of the vehicle. On the other hand, as shown in FIG. Can be incorporated into the bumper D1.
Further, at this time, the height H1 from the ground in the finisher body 2 can be made higher than before, so that it is possible to prevent water from entering the exhaust system at the time of flooding or snowfall.

Example 2 will be described below.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, the description thereof will be omitted, and only differences will be described in detail.
FIG. 5 is a side view showing an exhaust system finisher structure according to Embodiment 2 of the present invention.

  As shown in FIG. 5, the second embodiment is different from the first embodiment in that a sliding groove 20 is used in which the width W <b> 1 of the sliding groove 9 described in the first embodiment becomes narrower toward the vehicle rear side. Further, the diameter of the pin 11 is somewhat larger than that of the first embodiment.

  Therefore, in the second embodiment, as the finisher body 2 moves toward the front side of the vehicle, the pin 11 pushes and opens the sliding groove 9 so that the straight pipe portion 3 of the finisher body 2 is expanded. The effect of reducing the sliding resistance with the tail pipe 1 and smoothly moving the finisher body 2 to the front side of the vehicle can be obtained.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, in the first embodiment, the movement range of the finisher body 2 is regulated, but it is not always necessary to regulate it.
Also, the C-type clamp can be omitted.

1 is an overall view showing an exhaust system of Example 1 of the present invention. It is a side view which shows the finisher structure of the exhaust system of the present Example 1. It is sectional drawing in the S3-S3 line | wire of FIG. It is a figure explaining the effect | action of the present Example 1. FIG. It is a side view which shows the finisher structure of the exhaust system of Example 2 of this invention.

Explanation of symbols

a1 Engine a2 Exhaust manifold a3 Catalytic converter a4, a6 Connection pipe a5 Sub muffler a7 Main muffler B1 Bolt D1 Bumper 1 Tail pipe 1a Rear end 2 Finisher body 2a Front end 3 Straight pipe 4 Expansion pipe 5 C-type clamp 6 Opening hole 7 Dimple part 8 Slit 9, 20, 21 Sliding groove 10 Stopper part 11 Pin 12 Inserting groove 13 Part of the inserting groove

Claims (2)

  An exhaust system finisher structure characterized in that a finisher body mounted on an exhaust system tail pipe is fixed so as to be movable forward of the vehicle with respect to the tail pipe in the event of a collision at the rear of the vehicle. A finisher body that is slidable in the axial direction on the tail pipe of the exhaust system;
A sliding groove opened in the axial direction on the outer periphery of the finisher body;
A pin that protrudes radially outward from the outer periphery of the tail pipe and that locks the stopper portion formed in the sliding groove on the vehicle front side to place the finisher body in a predetermined position;
When the rear part of the vehicle collides, by releasing the locking of the pin and the stopper part, the finisher body can be moved to the vehicle front side with respect to the tail pipe while sliding the pin in the sliding groove. The exhaust system finisher structure.

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