JPS5939133Y2 - Vibration isolation device for exhaust pipe protector for internal combustion engines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration isolating device for an exhaust pipe protector connected to, for example, an automobile engine.3 Generally, engine vibration caused by rotation of the crankshaft and explosive action of the engine during engine operation is The exhaust pipe and exhaust pipe protector vibrate to generate radiated sound, which often generates noise outside the vehicle.

Conventionally, in order to prevent such radiated sound, a wire mesh is inserted between the exhaust pipe and the exhaust pipe protector to dampen the exhaust pipe protector, thereby reducing the radiated sound.

However, in the conventional technique of using such a stainless steel wire mesh on the entire surface between the exhaust pipe and the exhaust pipe protector, the flow of air in the diving part is blocked.

In other words, the temperature of the surface of the exhaust pipe is high, for example, exceeding 500°C, so if the entire surface between the exhaust pipe and the exhaust pipe protector is provided with vibration isolation support, the heat dissipation performance will deteriorate, and the temperature of the exhaust gas will not decrease and the temperature will be lowered after the exhaust pipe. This could have an adverse effect on the catalytic converter installed in the flow.

Another drawback was that the production costs were extremely high.

Therefore, in order to avoid the effect of the exhaust pipe protector in the high engine speed range where the radiated noise is large, the differential gear ratio and transmission gear ratio have been lowered, but such conventional methods are not suitable for vehicle planning. There were many problems.

The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide a vibration isolating device for an engine exhaust pipe protector that has both the vibration isolating effect of an exhaust pipe protector and a good exhaust pipe cooling effect. This is the purpose.

In order to achieve this purpose, the vibration isolating device for the exhaust pipe protector according to the present invention is provided in the case where the exhaust pipe protector is provided on the outer wall of the exhaust pipe via a stay, and the exhaust pipe protector is provided in the gap between the exhaust pipe and the exhaust pipe protector. The exhaust pipe protector is characterized in that a plurality of damping materials extending in the axial direction of the exhaust pipe are provided with gaps in the radial direction over the entire length of the exhaust pipe protector.

Hereinafter, the present invention will be further explained according to embodiments shown in the drawings.

FIG. 1 shows a partial cross section of an exhaust system using the vibration isolator according to the present invention, in which a plurality of damping materials 2 are placed around an exhaust pipe 3 at intervals of 9 in the radial direction. This figure shows what extends over the entire length of the protector 1.

Furthermore, although the damping material 2 is simply pressed and fixed between the exhaust pipe 3 and the exhaust pipe protector 1, there is a possibility that the damping material may gradually move to a lower position due to vibrations from the engine or vehicle body. However, as another example, Fig. 4~
It may also be configured as shown in FIG.

That is, in FIG. 4, the damping material 2 is attached to a wire mesh 6 at intervals, and in this state it may be wrapped around the exhaust pipe 3, and as shown in FIG. 5, the damping material 2 is attached to the ring 7 at intervals. The material 2 may be inserted into the exhaust pipe.

Furthermore, as shown in FIGS. 6 and 7, the exhaust pipe protector 1 may be provided with inwardly directed ribs in the portion between the damping materials 2, or the exhaust pipe protector may be provided with protrusions 8. .

In the above configuration, the vibration of the exhaust pipe 3 is absorbed by the damping material 2.
At the same time, as the vehicle runs, air flows from the front of the front pipe through the space between the exhaust pipe 3 and the exhaust pipe protector 1, helping to dissipate heat from the exhaust pipe.

As described above, the present invention has the effect of effectively damping the vibrations of the exhaust pipe using the damping material and making the catalytic converter unaffected by high-temperature exhaust gas.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of an exhaust system using a vibration isolator for an exhaust pipe protector according to the present invention, FIG. 2 is a radial cross-sectional view of the exhaust system shown in FIG. 1, and FIG. FIGS. 4 to 1 are radial cross-sectional views of the portion where the stays are attached; FIGS. 1... Exhaust pipe protector, 2... Damping material, 3
···Exhaust pipe.

Claims (1)

[Scope of utility model registration request] In the case where an exhaust pipe protector is provided on the outer wall of the exhaust pipe via a stay, a plurality of damping materials extending in the axial direction of the exhaust pipe are provided in the gap between the exhaust pipe and the exhaust pipe protector.
Vibration isolation device 3 for an exhaust pipe protector for an internal combustion engine, characterized in that the device is provided at intervals in the circumferential direction over the entire length of the exhaust pipe protector.