JPS5843610Y2 - Internal combustion engine thermal reactor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a thermal reactor for an internal combustion engine that can be installed in a small engine such as a motorcycle.

In large engines such as automobiles, a thick cylindrical thermal reactor is connected to the exhaust pipe, but in small engines,
There is no such place and it cannot be installed.

This invention is a thermal reactor that can be installed even in small engines by keeping the exhaust pipe length the same and making it difficult to cool down the exhaust heat.The following describes an embodiment of the invention shown in the drawings.

An exhaust outer pipe 4 is provided with a gap on the outside of the exhaust inner pipe 3 connected to the exhaust hole 2 of the engine 1, the tip of the exhaust outer pipe 4 is widened, and a heat insulator 5 such as ceramic is connected to the exhaust inner pipe 3 for exhaust air. Outer cylinder 4
Put it between.

6 is a gasket, and 7 is a fastening ring.

The keymal reactor 8 has narrow front and rear ends, and the front end is welded to the rear end of the exhaust inner pipe 3.

In addition, the outer periphery of the reactor 8 is covered with a reactor outer cylinder 9 at intervals, and a heat insulating cylinder 1 made of ceramic or the like is placed before and after the reactor outer cylinder 90.
0 is inserted so that there is a gap in the axial direction, and the reactor 8 is held by the heat insulating cylinder 10.

11 is a heat insulating material such as glass wool, 12 is a gas seal ring, and 13 is a heat insulating material.

The front end of the reactor outer cylinder 9 is wrapped around the exhaust outer cylinder 4 with a band 14.
Concatenate by.

A muffler tube 15 is inserted into the rear end of the reactor outer tube 9 and connected with a fastening band 17 via a gasket 16.

The muffler tube 15 fixes the holding part 18 to the vehicle body.

The effect will be explained.

Exhaust gas discharged from the exhaust hole 2 of the engine 1 enters an exhaust inner pipe 3.

Since the exhaust inner pipe 3 is covered with the exhaust outer pipe 4 with a gap and is insulated with an air layer, the temperature drop of the exhaust gas is small.

Further, since the heat insulator 5 is inserted at the tip of the exhaust outer pipe 4, heat is not transferred from the exhaust inner pipe 3 to the exhaust outer pipe 4 and does not escape.

In this way, the exhaust gas enters the actuator 8 while remaining at a high temperature, expands and stays for a while, and is combusted to reduce harmful components.

Then, it flows into the muffler tube 15, where it is muffled and discharged.

The front end of the reactor 8 is fixed to the exhaust inner pipe 3, and it expands and stretches rearward due to heat, but this expansion is allowed because there is an axial gap between the heat insulating cylinder 10 and the reactor outer cylinder 9.

As explained above, this idea consists of a double pipe with a gap between the inner exhaust pipe and the outer exhaust pipe by inserting a heat insulator at the ends, and the front end of the reactor is welded to the rear end of the inner exhaust pipe. Wrap the front end of the reactor outer cylinder around the rear end of the tube and tighten it with a band. Insert the heat insulating cylinder so that there is an axial gap at the front and rear of the reactor outer cylinder. Since the muffler tube is connected to the rear end of the outer tube, the exhaust gas can be guided to the reactor with less temperature drop.
It can be purified by combustion in a reactor.

Furthermore, even if the reactor expands due to combustion heat, this can be tolerated because there is an axial gap in the heat insulating cylinder.

If the exhaust pipe is shortened by the length of the reactor, it can be installed in a small engine such as a motorcycle without increasing the size.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an embodiment of the present invention. 3... Exhaust inner pipe, 4... Exhaust outer pipe, 5... Heat insulator, 8... Reactor, 9... Reactor outer cylinder, 10...
・Insulation tube, 14... Wrap band, 15... Muffler tube.

Claims (1)

[Scope of utility model registration request] Insert a heat insulator at the ends of the exhaust inner pipe and the exhaust outer pipe to create a double pipe with a gap.The front end of the reactor is welded to the rear end of the exhaust inner pipe, and the front end of the reactor outer cylinder is attached to the rear end of the exhaust outer pipe. Wrap and tighten with a band, insert an insulating tube so that there is a gap in the axial direction at the front and rear of the reactor outer cylinder, support the front and rear of the reactor in the insulating tube, and connect the muffler tube to the rear end of the reactor outer cylinder. A thermal reactor for an internal combustion engine, characterized in that: