JPH0458007A - Exhaust device for vehicle - Google Patents

Abstract

PURPOSE:To reduce adverse effect of exhaust gas to walkers and the roadside in an urban district, etc., by arranging a tail pipe provided with a valve for closing the pipe in a low speed operating region of an engine so that an exhaust port of the pipe is located on the roadside of a travel-roadway. CONSTITUTION:In the inside of the intermediate part 4a of a second tail pipe 4, a valve for closing the pipe in a low speed operating region of an engine where the exhaust gas flow little, is provided, and an opening and closing mechanism 5 of the valve is arranged and installed to a portion of the intermediate part 4a on the opposite side from the silencer 1 side. An exhaust port 4b of the second tail pipe 4 provided with the valve is arranged on the assistant seat 13 side of a vehicle 11. When the vehicle travels in a streed where the engine must be operated at relatively low speeds and at a low load state, exhaust gas is discharged only from a first tail pipe on the driver seat 12 side, and exhaust gas is not discharged from the exhaust port 4b of the second tail pipe 4 on the assistant seat 13 side. Adverse effect of exhaust gas to walkers and the roadside in an urban district, etc., can thus be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust system for a vehicle that includes a valve that opens and closes an exhaust passage depending on the operating state of an engine.

(Prior Art) Conventionally, a plurality of tailpipes are connected to a silencer body arranged in the exhaust path of an engine, and one of the plurality of tailpipes is equipped with a valve (controlled A vehicle exhaust system is known that is equipped with a valve (see Japanese Utility Model Application No. 63-36614).

In the low speed range of the engine where quietness is required, the above valve is closed to increase exhaust resistance and reduce exhaust noise, while in the medium and high speed range of the engine, the above valve is opened to lower the exhaust pressure. This is intended to improve the engine's output.

By the way, harmful components in gasoline and engine exhaust gas, such as Co (-carbon oxide), are emitted in the highest amount when driving at low speeds or when idling, such as when stopped at a traffic light, and decrease during acceleration and deceleration, and then remain constant. The least amount occurs during high-speed driving. On the other hand, although it has no effect on the human body as long as the concentration is low, it has a large effect on plants, and is considered a natural enemy of plants (HC).
Hydrocarbons) are components that occur most frequently during deceleration and rapidly decrease during idling, acceleration, or constant speed driving.

The combustion of gasoline in a vehicle running at a constant speed is close to complete combustion, so most of it is emitted as carbon dioxide and water and is not a problem, but when driving at low speeds, the air As a result of insufficient combustion, harmful components such as CO and HC are emitted from the engine.

Most of these harmful components are absorbed by the catalytic converter installed in the exhaust passage, but efforts are still being made to reduce the negative impact of exhaust gas on pedestrians and plants along the roadside by changing the location of the exhaust port. Ta.

(Object of the Invention) An object of the present invention is to provide an exhaust system for a vehicle that can reduce the adverse effects of exhaust gas on pedestrians and roadsides in urban areas and the like.

(Structure of the Invention) A vehicle exhaust system according to the present invention leads out two tail pipes from a silencer body so that their exhaust ports are arranged at intervals in the vehicle width direction, and The present invention is characterized in that one tail pipe of the pipes located on the roadside side of the running road surface is provided with a valve that closes the pipe line in the low rotational speed range of the engine.

(Effects of the Invention) In vehicles used in countries that adopt a left-hand driving system, the driver's seat is generally located on the right side when facing the direction of travel, and the passenger seat is located on the left side, that is, on the roadside side of the road surface. Therefore, of the two tailpipes spaced apart in the vehicle width direction, the tailpipe located on the passenger seat side is on the sidewalk side when the vehicle is traveling in a city area.

In the present invention, of the two tailpipes, the tailpipe equipped with a valve that closes the conduit in the low rotation range of the engine is arranged so that its exhaust port is on the roadside side of the running road surface, so that it can be used in urban areas etc. It is possible to reduce the negative impact of exhaust gas on pedestrians and other people along the road when the vehicle is running at low speed or stopped at a traffic light.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 2A and 2B are a plan view and a side view showing an embodiment of a vehicle exhaust system according to the present invention.

In the figure, a silencer body 1 placed horizontally with respect to a vehicle body includes an exhaust pipe 2 forming an inlet to the silencer body 1, and a first tail pipe 3 forming an outlet of an exhaust passage with high exhaust resistance. The second tail vibe 4 forms an outlet of an exhaust passage with low exhaust resistance. When this vehicle is a right-hand drive vehicle as shown in FIG. An exhaust port 3b is opened at the rear end. In addition, in a right-hand drive vehicle used in a country that adopts a left-hand traffic system, the second tail vibe 4 is inserted from the left side of the silencer body 1, that is, from the passenger side on the roadside side of the road surface on which the vehicle 11 is traveling. Seat 1
The exhaust port 4b is led out from the third side and similarly bent toward the rear, with an exhaust port 4b opening at the rear end.

A valve (not shown) that is closed in a low rotation range where the exhaust flow rate of the engine is small is provided inside the intermediate portion 4a of the second tail vibe 4, and an opening/closing mechanism 5 for this valve is connected to the intermediate portion 4a. The silencer body 1 side is disposed at a site opposite to the silencer body 1 side.

In medium and high speed ranges where the exhaust flow rate of the engine is large, the valve is opened, and the exhaust gas is mainly discharged from the second tail vibe 4, which has low exhaust resistance. The opening/closing mechanism 5 is operated by the driving force of a motor (not shown) transmitted via a cable 6.

As described above, in this embodiment, the exhaust port 4b of the second tail vibe 4 equipped with the above-mentioned valve is arranged on the passenger seat B side of the vehicle 11, so that the engine rotates at a relatively low speed. When driving in urban areas under low load conditions,
Exhaust gas is discharged only from the first tail pipe 3 on the side of the driver's seat 12, and is not discharged from the exhaust port 4b of the second tail vibe 4 on the side of the passenger seat 13, so that the negative impact of the exhaust gas on the roadside is reduced. will be done. Further, in this embodiment, since the intermediate portion 4a of the second tail vibe 4 is interposed between the valve drive system members including the valve opening/closing mechanism 5 and the cable 6, etc. and the silencer body 1, The radiant heat from the silencer body 1, which is in a high temperature state, is blocked by the second tail vibe 4, thereby preventing the valve drive system members from being damaged by heat.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a vehicle to which the present invention is applied, and FIGS. 2(A) and 2(B) are a plan view and a side view showing one embodiment of the present invention. 1... Silencer body 2... Exhaust pipe 3.
...First tail life 4...Second tail pipe 5...Opening/closing mechanism 6...
cable

Claims (1)

[Claims] 1. Lead out two tail pipes from the silencer body so that their exhaust ports are arranged at intervals in the vehicle width direction, An exhaust system for a vehicle, characterized in that one of the tail pipes located on the roadside side is provided with a valve that closes the pipe in a low rotational speed range of the engine. 2. The above silencer body is placed horizontally, and the above 2.
2. The exhaust system according to claim 1, wherein two tail pipes are led out from both sides of the silencer body.