JPS607224Y2 - Automotive exhaust system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust system for automobiles, and more particularly to one with improved vibration characteristics.

As shown in FIGS. 1 and 2, an automobile exhaust system generally includes a three-dimensionally extending tube 1, a catalytic converter 2 and a muffler 3 interposed in the tube 1. The entire structure is suspended and supported by a body (not shown) by suspension springs 4, 4.

These tubes 1, catalytic converter 2 and muffler 3
The shape and arrangement of the suspension spring 4 are determined by the purification and noise reduction functions, and the position of the suspension spring 4 is also constrained by the shape of the body and engine (not shown).

Therefore, the automobile exhaust system has a unique vibration characteristic in response to vibration input, and if this vibration characteristic tends to cause damage in a normal use area, it is extremely dangerous.

In view of the above-mentioned points, the present invention was developed with the aim of providing an automobile exhaust system that can arbitrarily change the vibration characteristics, and in which an inertial weight is attached to a tube eccentrically from the center of the tube. , the inertial weight is movable and adjustable in the axial direction of the tube.

The present invention will be explained below with reference to embodiments shown in the drawings.

3 and 4 show an embodiment of an automobile exhaust system according to the present invention, in which three inertial weights 5, 5.5 are attached to the tube 1.

Each of these inertial weights 5 is supported eccentrically from the center of the tube 1 by a support arm 6 fixed to the tube 1 and - for example, by a clamp 7 fixed to said tube 1 on the side of the tube 1. On the other hand, it is auxiliary supported by a rod Ia8 extending along the tube 1.

Therefore, by attaching the inertia weight 5 eccentrically from the tube 1 and having a large moment at a specific position, the vibration characteristics of the automobile exhaust system can be changed, stress concentration can be reduced, and the service life can be extended.

Embodiments of the inertial weight 5 are shown in FIGS. 5 to 8.

Figures A and B are the steel bars 8 shown in Figures 3 and 4.
The inertial weight 5 is supported eccentrically from the center of the tube 1.

A steel bar 8 is held between a pair of protrusions 14 and 15 of the modified C-clamp 13 fixed to the tube 1 by bolts 12, and on the other hand, a bolt 17 is slid into the elongated hole 16 of the protrusion 15 that protrudes for a long time. An inertia weight 5 is screwed onto the bolt 17 to support the tube 1 so that its movement can be adjusted in the radial direction.

Therefore, by adjusting the fixed position of the clamp 13 with respect to the axial direction of the tube 1 and the fixed position of the inertial weight 5 with respect to the elongated hole 16, the vibration characteristics can be changed.

6A and 6B are modifications of the embodiment shown in FIGS. 5A and 5B, and when a C clamp 18 having a diameter larger than the outer diameter of the tube 1 is fixed to the tube 1 with a bolt 19, this clamp 18 and A substantially L-shaped support plate 20 is interposed between the tubes 1, and the bolts 2 are inserted using the long holes 21 of this support plate 20.
2, the inertial weight 5 is movably supported.

Next, in Fig. 7 A and B, attach the C clamp 23 to the bolt 24.
to the tube 1, and attach the bolt 10 to the tube 1.
is fixed, and an inertia weight 5 and a nut 11 are attached to the bolt 10.
11 and by loosening the nuts 11 and 11, the inertial weight 5 can be adjusted to move in the radial direction of the tube 1.

Even in this case, the movement of the inertial weight 5 can be adjusted both in the axial direction and in the radial direction of the tube 1.

8A and 8B show an inertia weight 5 welded directly to a C-clamp 26 fixed to the tube 1 with a bolt 25.

In this way, the configuration can be simplified.

As explained above, in the automobile exhaust system according to the present invention, the inertia weight is attached to the tube eccentrically from the center of the tube, and the inertia weight can be moved and adjusted in the axial direction of the tube. Vibration characteristics can be changed arbitrarily by balancing the center of gravity with an inertial weight.
It has the excellent effect of reducing stress concentration and extending life.

[Brief explanation of the drawing]

Figure 1 is a side view of a typical automobile exhaust system;
The figure is a plan view of Fig. 1, Fig. 3 is a side view showing an embodiment of the automobile exhaust system according to the present invention, Fig. 4 is a plan view of Fig. 3, and Figs. Figures 5A, 6A, 7A1 and 8A are longitudinal sectional views, and Figure 5B1, Figure 6B1, Figure 7B1, and Figure 8B are diagrams showing examples of weights. FIG. 1...Tube, 2...Catalytic converter, 3...Muffler, 5...Inertia weight,
Death...Steel bar, 9...Bracket, 13,
18, 23, 26... Clamp.

Claims (2)

[Scope of utility model registration request] (1) In an automobile exhaust system that is suspended from a body and has a muffler interposed in a tube, an inertial weight is attached to the tube eccentrically from the center of the tube, and the inertial weight is attached in the axial direction of the tube. Automotive exhaust system that can be moved and adjusted. (2) The automobile exhaust system according to claim 1, wherein the inertial weight is movable and adjustable in the radial direction of the tube.