JPS5836724A - Cooler for automobile's muffler - Google Patents

Abstract

PURPOSE:To give the advantages in terms of space and effectively cool a muffler by feeding forced cooling air for an engine around the muffler via a guide. CONSTITUTION:Cooling air flows around a cylinder block or so of an engine to cool it, is forcibly fed rearward from the outlet 17b of a guide member 17, guided rearward through a passage 23 which is formed around the periphery of a muffler 20 and then discharged to the rear side. The muffler 20 is forced to be cooled by the lengthwise flow of the forced cooling air inside the passage 23. Since separated from the ambient air by the longitudinal piece 21a and the lateral piece 21b of a partition wall 21, the cooling air will not contact an air cleaner, a carburetor and so on to efficiently cool the muffler 20 only while hot air by the muffler 20 will not contact them and its radiant heat is cut off by the partition wall 21.

Description

[Detailed Description of the Invention] The present invention is applicable to small-sized vehicles such as motorcycles, motorized three-wheeled vehicles, and four-wheeled vehicles.
This invention relates to a muffler cooling system for a light vehicle in which the engine and drive wheels are covered with a cover.

It is known that this type of light vehicle has a cover covering the main parts of the engine and drive wheels to improve its appearance.In this case, the muffler is led out from the engine through the cover, and the muffler is The exhaust heat generates a high temperature, and by passing such a high-temperature muffler into a closed space around the inside of the cover, the heat may adversely affect peripheral devices such as an air cleaner, a carburetor, and electronic equipment.

Therefore, equipment such as the muffler and air cleaner are separated, and a space is created to take in outside air for cooling. However, this makes it difficult to arrange the equipment around the engine in a compact and advantageous space layout. It is necessary to provide a large space between the muffler and the equipment ζ, and the outer shape of the cover etc. becomes larger, the outer shape of the vehicle becomes larger, and the weight also becomes larger. Improvements are desired in order to make the vehicle smaller and lighter.

The present invention has been made to improve the above-mentioned problems.The main purpose of the present invention is to provide a muffler air cooling guide member so that the flow of air continues downstream of the cooling air guide member for forced air cooling of the engine. To provide a muffler cooling device for a vehicle, which allows forced cooling air to flow around a muffler via a guide member, thereby effectively cooling the muffler, and which is advantageous in terms of space and can be designed without enlarging the space. It is on offer.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the embodiment, a motorized tricycle is shown as the vehicle 1, and FIGS. 1 and 2 show its external shape. A front wheel 3 serving as a single steering wheel is provided, and a leg shield 4 is mounted on the front wheel 3.
is attached, and a handle 5 faces above it. A seat post 6 is installed upwards at the rear of the front body 2, a seat 7 is provided on the seat post 6, and a joint 8 is provided at the bottom of the rear part that swings vertically rearward and rolls left and right. The rear vehicle body 9 is connected via the joint 8 to the front vehicle body 2 so as to be swingable up and down, and the front vehicle body 2 is connected to the rear vehicle body 9 so as to be able to roll left and right.

A power unit 12 consisting of an engine 10 and a transmission case 11 is disposed inside the rear vehicle body 9.
The lower front end of the transmission case 11 is connected to the joint 8.
Two rear wheels 13.13, which serve as driving wheels, are arranged on the left and right rear sides of the vehicle. As shown in FIG. 4, the engine 10 is provided near one side of the front part, and the transmission case 11 is provided long from the other side of the front part toward the rear. A space is provided behind the engine. The power unit 12 and rear wheels 13 and 13 are covered with a cover 16, specifically covering the upper part of the engine, the upper part of the power unit, the left and right sides of these, the upper part of the rear wheel, the left and right sides, and the rear part, and the lower part of the rear wheel is exposed to the outside. However, the lower surface is open, and the cover 16 includes an upper piece 16a in the left and right direction spaced apart above the engine and above the rear wheels, and side pieces 16b, 16b hanging down on the left and right, and is molded from synthetic resin or the like. Further, partition pieces 15c and 16d are hung from the lower surface of the upper piece 16a at a distance from the left and right, and the partition pieces 16C916
Each of d faces the inside of the rear wheels 13 and 13 in the vehicle width direction,
This prevents rainwater and mud splashing up from the rear wheels 13.13 from affecting equipment, etc.

The engine 10 is an air-cooled engine, and a shroud 17 as a guide member for guiding cooling air is provided around the engine as shown in FIGS. 3 and 5. One side wall 17 of the shroud 17
A is provided with an outside air intake 18, which faces one side of the cover 16 described above, and which is connected to the crankshaft 1.
A cooling fan 19 provided at the outlet end 0a faces the inside of the intake port 18.

As shown in FIG. 3, the shroud 17 covers the circumference and top of the engine 10, and has an outlet portion 17b extending upward and rearward. Exit part 1
In yb, since the engine 10 is biased to one side, the engine 10 is biased to one side and opens rearward at the upper part. A muffler 20 is disposed in the direction. The muffler 20 is biased to one side from the center line in the width direction as shown in FIGS. 4 and 6, and adjoins the air cleaner 15, etc. on the other side. Extend. The partition plate 21 is the transmission case 1
The partition plate 21 passes over the axle portion 11a of the
The side piece 21a is suspended between the muffler 20 and the air cleaner 15, etc., the horizontal piece 21b supports the bracket 20a of the muffler 20 with bolts 22, etc., and the partition plate 21 is attached to and supported by a transmission case, etc. The front end of the plate 21 communicates with the aforementioned outlet section 17b, and the rear end is open to the rear, thus opening the front to the outlet section 17b, the back to the rear, and closing the top and sides with the partition plate 21 in the front-rear direction. A muffler cooling air passage 23 is formed.

Next, the function and effect will be described. The cooling fan 19 is rotationally driven by the drive of the multi-rank shaft 10a of the engine 10, and the outside air is taken into the shroud 17 from the intake port 18 by the rotation of the cooling fan 19. The taken-in cooling air flows around the cylinder block of the engine 10 and cools it, and the cooling air is forcibly sent rearward from the outlet portion 17b and passes through the passage 23 formed around the muffler 20. The muffler 20 is forced to be cooled by the flow in the front-rear direction in the forced cooling air passage 23. Since the cooling air is separated from the surrounding area by the side pieces 21a and 21b of the partition plate 21, it does not come into contact with the air cleaner, vaporizer, etc.
Only the muffler 20 is efficiently and effectively cooled, the hot air warmed by the muffler 20 does not touch them, and the radiant heat of the muffler 20 is blocked by the partition plate 21.

In this way, the muffler 20 is efficiently and effectively cooled by covering its surroundings with the cover 16 and using the forced cooling air of the engine, thereby preventing peripheral equipment from the thermal influence of the muffler. Because it performs forced cooling, peripheral equipment and the muffler can be brought close together, which is advantageous in terms of space, allowing for a compact external shape and effective use of space.
In addition to being able to centralize the engine, muffler, and peripheral equipment, the structure is simple and only one forced cooling means is required.

The present invention has many advantages as described above.

In the embodiment, a motorized tricycle is shown as an example, but it should be noted that the invention can also be applied to a motorcycle, a motorized four-wheeled vehicle, or the like.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the vehicle, Fig. 2 is a plan view thereof, Fig. 3 is an explanatory side sectional view of the main parts, and Fig. 4 is a power unit system. FIG. 5 is a cutaway view of the engine portion, and FIG. 6 is an explanatory sectional view taken along line 6-6 in FIG. 3. In the drawings, 1 is a vehicle, 10 is an engine, 16 is a cover member,
17 is a guide member, 19 is a cooling fan, 20 is a muffler,
23 is a cooling passage. Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] In small and light vehicles where at least the power unit such as the engine and the muffler are covered with a cover member on the vehicle body to reduce exposure to the outside, the area around the engine is covered with a guide member and outside air is taken in with a cooling fan etc. A muffler cooling device for a vehicle, in which a cooling air passage is provided downstream of the forced cooling air to partition the muffler and peripheral equipment, and the forced cooling air is also caused to flow around the muffler.