JPH1172022A - Exhaust device of engine for mobile object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve output and an fuel consumption performance of an engine mounted on a mobile object, at the time of moving (running, flying, sailing) or idling of the engine. SOLUTION: Exhaust gas G from an engine is exhausted to the atmosphere through a manifold, catalytic converter, scilencer and exhaust pipe 7 under high speed driving of a car. Simultaneously, air flowing along the car side is allowed to flow into an intake port of a supply pipe 8. A flow rate of air A is throttled at the time of passing a flow rate throttling part 9 in the supply pipe 8. Due to Venturi's principle, the pressure of the air A is decreased while passing the flow rate throttling part 9, and negative pressure is generated at an exhaust port 7b of the exhaust pipe 7 connected to the throttling part. The exhaust gas G from the exhaust port 7b of the exhaust pipe 7 is positively sucted and exhausted due to the negative pressure. Exhaust resistance generated in an exhaust system is thus reduced, while output and fuel consumption performance of an engine are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel engine or gasoline engine mounted on a large / medium / small car (truck), bus, passenger car, light car, ship, or small airplane (known as a vehicle). The present invention relates to an exhaust device provided in a moving object engine such as a reciprocating engine mounted on a Cessna).

[0002]

2. Description of the Related Art Conventionally, when exhaust gas discharged from an engine mounted on a vehicle as described above is efficiently exhausted to the atmosphere side, for example, in addition to the problem in designing the body of the vehicle, the exhaust gas The exhaust gas discharged from each cylinder of the engine is collected by an exhaust manifold and exhausted through an exhaust pipe (exhaust pipe) and a silencer (silencer) aiming at the inertia effect and the pulsation effect of the engine. is there.

[0003]

However, the effects described above can be adjusted by changing the length of the exhaust manifold or the diameter of the exhaust pipe.
Even if it is effective in a specific engine speed range, if it is out of the speed range, the efficiency will decrease and the exhaust pressure will increase. If the effect is utilized to the utmost, the engine characteristic becomes peaky (restricted to a specific rotation range), and the engine becomes very difficult to handle.

When exhaust gas discharged from each cylinder of the engine is collected by an exhaust manifold and exhausted to an exhaust pipe, exhaust gas exhausted from one exhaust path and exhaust gas exhausted from another exhaust path are provided. Interfere with each other and interfere with each other's exhaust, causing exhaust interference, so that a large pressure is applied to the exhaust gas, which not only increases the exhaust pressure, but also reduces the exhaust resistance of the exhaust gas discharged from the engine. Therefore, engine output loss occurs. Further, when the gas passes through the silencer, the structure results in increasing the exhaust pressure.

In general, when the pipe diameter of the exhaust pipe is reduced, the exhaust efficiency at medium to low speeds is good, but at higher speeds, the exhaust resistance increases and the exhaust pressure increases. On the other hand, when the diameter of the exhaust pipe is increased, the exhaust efficiency at high speed is good, but when the speed is medium to low, the exhaust pressure increases in terms of the filling rate of exhaust gas. In order to lower the exhaust resistance by the above-described conventional method, there is no other way but to exhaust the exhaust gas by utilizing the physical characteristics of the exhaust gas itself or exhausting the exhaust gas as much as possible without obstructing the exhaust. Was.

In view of the above problem, the present invention narrows the flow rate of the air supplied in a direction substantially perpendicular to the exhaust port of the exhaust pipe by the flow restricting means, so that the flow velocity of the air is increased and the negative pressure is applied to the exhaust port. Occurs. It is an object of the present invention to provide an exhaust device for a moving object engine that can reduce exhaust resistance and improve engine output and fuel efficiency by sucking and exhausting exhaust gas exhausted from an exhaust port by the negative pressure. .

[0007]

According to the first aspect of the present invention,
An exhaust device that exhausts exhaust gas to the atmosphere side via an exhaust pipe connected to the engine when moving with an engine mounted on a moving object or at the time of idling of the engine. Air supply means for supplying air in a direction substantially perpendicular to the air supply means is provided, and flow rate reduction means for reducing the flow rate of air supplied toward the exhaust port is provided opposite to the exhaust port of the exhaust pipe. It is an exhaust device of the provided moving object engine.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the air supply means is provided so that air is supplied to the exhaust port of the exhaust pipe in a direction substantially orthogonal to the exhaust port. A supply pipe for supplying the supply pipe is connected, and an intake port formed on one end side of the supply pipe is opened in a moving direction of the moving object,
An exhaust port formed at the other end side is opened toward the side of the moving object, and the flow rate restricting means is supplied toward the exhaust port, facing the exhaust port of the exhaust pipe. The exhaust device for a moving object engine is provided with a flow restrictor for restricting the flow of air.

According to a third aspect of the present invention, there is provided an airflow guide for guiding the air in a direction substantially perpendicular to an exhaust port of the exhaust pipe, in combination with the configuration of the first aspect. The airflow guide is provided so as to be movable between an opposing position approaching the exhaust port and a retracted position retracted to a side of the exhaust port, and the flow restrictor is provided with The present invention is characterized in that it is an exhaust device for a moving object engine, which is provided with a flow restrictor for restricting the flow rate of the air on a surface of the exhaust pipe facing an exhaust port and an airflow guide.

[0010] The invention according to claim 4 is the first and second inventions.
Or an exhaust device for a moving object engine provided with flow rate adjusting means for variably adjusting the amount of air supplied to the exhaust port of the exhaust pipe to an arbitrary supply amount in combination with the configuration described in 3. I do.

[0011] The fifth aspect of the present invention is the first aspect of the present invention.
An exhaust device for a moving object engine provided with throttle amount adjusting means for variably adjusting air supplied to an exhaust port of the exhaust pipe to an arbitrary throttle amount, in addition to the configuration described in 2, 3, or 4. It is characterized by the following.

[0012] The invention according to claim 6 is the invention according to claim 1,
In addition to the configuration described in 2, 3, 4, or 5, for a moving object, the air supply means is provided with air supply means for supplying air in a direction substantially perpendicular to an exhaust port of the exhaust pipe. It is an exhaust device for an engine.

[0013]

According to the first aspect of the present invention, there is provided an exhaust system for a moving object engine, which is provided to an exhaust port of an exhaust pipe connected to an engine when the moving object is moving (running, flying, navigating) or when the engine is idling. Air is supplied by an air supply unit in a direction substantially orthogonal to the air supply unit, and air supplied to an exhaust port is reduced by a flow restricting unit (for example, a Venturi-type supply pipe).
As a result, the flow velocity of the air increases due to the Venturi principle, and the pressure of the air decreases. Since the exhaust gas exhausted from the exhaust port of the exhaust pipe is positively sucked by the negative pressure, the exhaust resistance generated in the exhaust system is reduced, and the output and the fuel efficiency of the engine are improved at high, middle and low speeds.

According to a second aspect of the present invention, the exhaust device for a moving object engine uses the moving force of the moving object to flow air into the inlet of the supply pipe, for example, a flow restrictor formed in a venturi type. Supply air to the section. Since the flow rate of the air is reduced when passing through the flow rate restricting portion, the pressure of the air decreases as in claim 1, and the exhaust gas is positively sucked from the exhaust port of the exhaust pipe by the negative pressure. Since the air and the exhaust gas are exhausted to the atmosphere side from the mouth, the inflow amount of the air is increased or decreased according to the moving speed, and the flow velocity of the air passing through the flow restrictor is increased or decreased. As the moving speed increases, the negative pressure generated in the exhaust port increases, and the exhaust resistance applied to the exhaust system decreases, so that the output and fuel efficiency of the engine improve.

According to a third aspect of the present invention, in addition to the operation of the first aspect, the exhaust device of the engine for a moving object is configured such that the air flow guide is moved by a wind pressure applied at the time of movement or by an actuator such as a motor or a cylinder to exhaust the air. Facing the outlet of the tube. The air is supplied by the airflow guide in a direction substantially perpendicular to the exhaust port, and the flow rate of the air is reduced by the flow restrictor formed on the surface facing the exhaust port and the airflow guide. Exhaust gas is positively sucked through the mouth, improving engine output and fuel efficiency.

According to a fourth aspect of the present invention, there is provided an exhaust system for a moving object engine according to the first to third aspects of the present invention.
The amount of air supplied to the exhaust port of the exhaust pipe is adjusted by the flow rate adjusting means.
Since the flow velocity of the air is increased or decreased, and the negative pressure generated at the exhaust port of the exhaust pipe is varied, it is possible to variably adjust the exhaust resistance to an arbitrary value.

According to a fifth aspect of the present invention, there is provided an exhaust system for a moving object engine, wherein the amount of throttle of the air supplied to the exhaust port of the exhaust pipe is reduced in conjunction with the operation of the first, second, third or fourth aspect. Since the adjustment is performed by the throttle amount adjusting means, the flow velocity of the air is increased or decreased according to the throttle amount, and the negative pressure generated at the exhaust port of the exhaust pipe is changed. be able to.

According to a sixth aspect of the present invention, there is provided an exhaust system for a moving object engine, wherein, in addition to the operation of the first, second, third, fourth or fifth aspect, the exhaust device is directed in a direction substantially orthogonal to an exhaust port of an exhaust pipe. In this case, the air is supplied by the air supply means, so that the amount of supplied air is larger than in the method of supplying air using the moving force of the moving object. Since a large amount of intake air is continuously supplied, the flow rate of the intake air is further increased when passing through the exhaust port or the flow restrictor, and the negative pressure generated at the exhaust port of the exhaust pipe is increased. The exhaust gas to be exhausted can be positively sucked, and the exhaust efficiency is improved.

[0019]

According to the present invention, when the moving object is moving or idling, the air supplied to the exhaust port of the exhaust pipe is restricted by the flow restricting means. Faster and the air pressure drops. Since the exhaust gas exhausted from the exhaust port of the exhaust pipe is positively sucked by the negative pressure, the exhaust resistance generated in the exhaust system is reduced, and the output and fuel efficiency of the engine are improved at high, medium and low speeds. When not needed (medium to low speed)
By stopping the supply of air by the air supply means, the exhaust resistance (exhaust pressure) becomes somewhat higher than when negative pressure is generated, and a braking action by the engine brake is obtained.

Further, air is supplied to the flow restrictor in the supply pipe connected to the exhaust pipe by utilizing the moving force of the moving object, and the exhaust gas is positively sucked by the negative pressure generated in the flow restrictor. Therefore, the inflow amount of air is increased or decreased in accordance with the moving speed, and the flow speed of the air is increased or decreased when passing through the flow restrictor.As the moving speed increases, the negative pressure generated in the exhaust port increases. , The exhaust efficiency is improved. Also, if a supply pipe is attached to the exhaust port of an exhaust pipe that is piped so that exhaust gas is discharged upward, it is possible to prevent rainwater or the like from entering the exhaust pipe to some extent, and to prevent corrosion. Can be prevented.

Further, the air flow guide is moved by a wind pressure or an actuator applied at the time of movement, and is opposed to the exhaust port of the exhaust pipe, so that the air supplied toward the exhaust port is narrowed down by the flow restrictor. Since the exhaust gas is positively sucked by the negative pressure generated in the portion, the exhaust resistance is reduced, and the output and fuel consumption of the engine are improved. Further, by adjusting the air supply amount by the flow rate adjusting means or adjusting the air throttle amount by the throttle amount adjusting means, the flow velocity of the air is increased or decreased according to the supply amount or the throttle amount. Since the negative pressure generated at the exhaust port of the exhaust pipe is variable,
It can be variably adjusted to any exhaust resistance.

In addition, by supplying air to the exhaust port of the exhaust pipe by the air supply means, the supply amount of air is increased as compared with the method using the moving force of the moving object. Since a large amount of intake air is continuously supplied, the flow velocity of the intake air when passing through the exhaust port or the flow restrictor is further increased, and the negative pressure generated at the exhaust port of the exhaust pipe is increased. The exhaust gas exhausted from the exhaust system can be positively sucked, the exhaust resistance generated in the exhaust system is reduced, and the exhaust efficiency is improved. In addition, since the supply amount of air is variably adjusted according to the moving speed of the moving object and the number of revolutions of the engine, a high output is obtained at the time of movement and at the time of idling, and fuel efficiency is improved.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawings show, as an example of a moving object, an exhaust device provided in an exhaust system of a diesel engine or a gasoline engine mounted on a large vehicle (truck). In FIG. 1, an exhaust device 1 of the present invention is, for example, a truck. A large vehicle 2 such as a bus is driven at high speed, and exhaust gas G discharged from the engine 3 is exhausted to the atmosphere via a manifold 4, a catalytic converter 5, a silencer 6, and an exhaust pipe 7. At the same time, air A is sucked into the supply pipe 8 orthogonally connected to the exhaust port 7b of the exhaust pipe 7, and the exhaust gas G exhausted from the exhaust port 7b is forcibly forced by the negative pressure generated in the supply pipe 8. And exhaust to the atmosphere side.

In the exhaust device 1 described above, as shown in FIG. 2, a supply pipe 8 is connected in a direction perpendicular to an exhaust port 7b of an exhaust pipe 7 formed on the downstream side of the silencer 6, and the exhaust port 7b On the inner peripheral surface of the supply pipe 8 corresponding to the connection portion of
A flow restricting section 9 (Venturi section) for restricting the flow rate of the air A flowing into the supply pipe 8 is formed. Supply pipe 8
Is installed inside or outside the vehicle width of the vehicle body 2a constituting the large-sized automobile 2, and is piped in parallel to the front and rear direction or the vertical direction with respect to the side of the vehicle body 2a. An intake port 8a formed on the front end side of the supply pipe 8 is in a direction (substantially directly in front) corresponding to the traveling direction (forward direction) of the large-sized vehicle 2 and the vehicle body 2a
It opens toward the front (front side). On the other hand, an exhaust port 8b formed on the rear end side opens rearward or obliquely rearward (rear side) with respect to the vehicle body 2a, and exhaust gas G discharged from the engine 3 is directed rearward with respect to the vehicle body 2a. Exhaust. Further, the exhaust port 8b may be opened downward or upward with respect to the vehicle body 2a. Further, if the supply pipe 8 is attached to the exhaust port 7b of the exhaust pipe 7 which is arranged so that the exhaust gas G is discharged upward, it is possible to prevent rainwater or the like from entering the exhaust pipe 7 to some extent. And prevent corrosion.

The intake port 8a has a size and a shape into which air A flowing along the side of the vehicle body 2a flows. For example, the intake port 8 corresponding to the front side of the vehicle body 2a
(a) The front end side inner peripheral surface is formed to have a large diameter, the rear end side inner peripheral surface is formed to have a small diameter, and the diameter gradually decreases from the front end side to the rear end side (for example, trumpet type, cone type). , Cubic, etc.). During traveling, the air A flowing along the side of the vehicle body 2a is guided in the direction of flow toward the inside of the pipe (the direction of the arrow), and the air A flowing into the pipe is guided from the intake port 8a to the exhaust port 8b. Flow toward. In addition, the intake port 8
For example, a protective net made of a synthetic resin, metal, or the like may be provided on a to prevent foreign matter such as tire fragments and dust from flowing into the intake pipe 8.

Further, by providing the intake port 8a of the supply pipe 8 in the traveling direction (forward direction) with respect to the front part (front side) of the vehicle body 2a, the intake port 8a of the supply pipe 8 is provided during traveling. The air A is efficiently introduced into the exhaust pipe 7 and the amount of intake air required to generate a negative pressure in the exhaust port 7b of the exhaust pipe 7 is obtained. Alternatively, an intake port 8a of the supply pipe 8 may be provided at an upper portion, a floor portion, or the like of the vehicle body 2a.

As shown in FIG. 3, the flow restrictor 9 has a shape in which the inner peripheral surface of the supply pipe 8 corresponding to the connection portion of the exhaust port 7b gradually becomes smaller in diameter from the intake side to the exhaust side. The exhaust port 7b of the exhaust pipe 7 is connected in a direction perpendicular to the throttle section 9a formed to have a minimum diameter, and the inner peripheral surface of the throttle section 9a and the exhaust port 7b are formed.
Is formed at the same height as the peripheral portion.

The front side of the throttle portion 9a is formed in a size and shape that gradually decreases in diameter from the intake side to the exhaust side. On the other hand, on the rear side of the constricted portion 9a, the size and shape immediately after the constriction portion are formed to be the same as or equal to the inner diameter on the intake side. Further, the rear side of the throttle section 9a may be formed in a size and shape that is larger than the inner diameter of the intake side. In addition, since the inner diameter of the throttle portion 9a is formed to be substantially the same diameter as the inner diameter of the exhaust pipe 7, the engine 3 is not driven when the vehicle is running at a low speed.
It is possible to prevent exhaust resistance from being given to exhaust gas G discharged from the exhaust gas, and exhaust gas G can be exhausted smoothly.

The illustrated embodiment is constructed as described above, and the operation of the above-described exhaust device 1 when exhaust gas G exhausted from the exhaust pipe 7 of the large vehicle 2 will be described below. First, as shown in FIGS. 1 and 2, when the large vehicle 2 is driven at high speed, the exhaust gas G discharged from the engine 3 is supplied to the manifold 4, the catalytic converter 5,
The air is exhausted to the atmosphere via the silencer 6, the exhaust pipe 7, and the supply pipe 8. At the same time, the air A flowing along the side of the vehicle body 2a flows into the intake port 8a of the supply pipe 8 provided on the same side, and the supply pipe 8
Air A is continuously supplied to the flow restrictor 9 formed therein.

Next, when the air A flowing into the supply pipe 8 passes through the flow restrictor 9, as shown in FIG.
Is gradually narrowed down, and when passing through the throttle section 9a, the flow velocity of the air A rapidly increases, and the pressure generated in the throttle section 9a decreases. In other words, the pressure of the air A decreases when passing through the flow restrictor 9 according to the venturi principle, and a negative pressure is generated at the exhaust port 7b of the exhaust pipe 7 connected to the restrictor 9a. The exhaust gas G exhausted from the exhaust port 7b of the exhaust pipe 7 is actively sucked by the negative pressure generated in the throttle section 9a, and the exhaust gas G is exhausted from the exhaust port 8b of the intake pipe 8 to the atmosphere side. The exhaust resistance applied to the catalytic converter 5, the silencer 6, and the exhaust pipe 7 is reduced, and the output and fuel efficiency of the engine 3 are improved during high-speed running.

In addition, the air A flowing into the intake port 8a of the supply pipe 8 in accordance with the traveling speed of the large vehicle 2
Is increased or decreased, and the flow rate of the air A passing through the flow restrictor 9 is increased or decreased, so that the exhaust port 7b of the exhaust pipe 7 is
Can be increased or decreased, and the exhaust resistance can be variably adjusted according to the traveling speed.

Since the inner diameter of the exhaust pipe 7 and the inner diameter of the flow restrictor 9 provided in the supply pipe 8 are substantially the same, when the large vehicle 2 is driven at a low speed, the engine 3
The exhaust gas G exhausted from the exhaust gas is exhausted at a high rate, thereby preventing the exhaust resistance from being given. Further, the tube may be formed in a tube diameter or shape suitable for preventing the above-mentioned phenomenon from occurring.

As described above, when the large vehicle 2 is running, the flow restricting portion 9 formed in the intake port 8a of the supply pipe 8 is provided.
Since the air A is supplied to the air supply port and the flow rate of the air A is reduced when the air A passes through the flow restrictor 9, the flow velocity of the air A rapidly increases, and the pressure generated in the restrictor 9a decreases. Since the exhaust gas G exhausted from the exhaust port 7b of the exhaust pipe 7 is positively sucked by the negative pressure generated in the throttle portion 9a, the exhaust resistance generated in the exhaust system is reduced, and at high, medium, and low speeds,
The output and fuel efficiency of the engine 3 are improved.

In addition, the running force of the large-sized automobile 2 is used to apply air A to the flow restrictor 9 formed in the supply pipe 8.
Is positively supplied, so that the inflow amount of the air A is increased or decreased in accordance with the traveling speed, and the air A
Therefore, the negative pressure generated at the exhaust port 7b of the exhaust pipe 7 increases as the traveling speed increases, and the exhaust efficiency improves.

FIG. 4 shows a damper 1 arranged in a supply pipe 8.
The exhaust device 1 according to the second embodiment in which 0 is rotated to an arbitrary opening / closing angle to variably adjust the supply amount of the air A supplied to the flow restrictor 9 is shown. It is arranged on the front stage side of the flow restrictor 9 formed in this manner, and is pivotally supported so as to be openable and closable about a support shaft 11 which is radially mounted on the inner peripheral surface of the pipe. Actuator 1 connected to end of spindle 11
Numeral 2 turns the damper 10 to an arbitrary opening / closing angle based on the detection by the speed sensor 13 or the wind speed sensor 14 provided in the large vehicle 2. The actuator 12 described above and the actuator 21 described later are configured by, for example, a servomotor, a pulse motor, a cylinder, and the like.

At the time of high-speed running, air A is supplied to the flow restrictor 9 formed in the supply pipe 8 using the running force of the large-sized automobile 2, and the air is exhausted by the negative pressure generated in the flow restrictor 9. Since the exhaust gas G exhausted from the exhaust port 7b of the pipe 7 is sucked and exhausted to the atmosphere side, the same operation and effect as in the first embodiment can be obtained. Further, based on the detection by the speed sensor 13 or the wind speed sensor 14, the damper 10 is rotated to an arbitrary opening and closing angle, and the supply amount of the air A supplied to the flow restrictor 9 is variably adjusted. The flow rate of the air A passing through the flow restrictor 9 is increased or decreased in accordance with the amount, and the negative pressure generated at the exhaust port 7b of the exhaust pipe 7 can be increased or decreased. The exhaust resistance can be variably adjusted according to the traveling speed and / or the rotation speed of the engine 3.

FIG. 5 shows an exhaust device 1 according to a third embodiment in which the air supply fan 15 disposed in the supply pipe 8 is rotated to forcibly supply the air A to the flow restrictor 9. The air supply fan 15 is disposed on the upstream side of the flow restrictor 9 formed in the supply pipe 8 and is rotatably supported by a bearing 16 provided at a radial center inside the pipe. The rotation motor 17 with a speed reducer, which is directly connected to the center of the shaft of the air supply fan 15, rotates the air supply fan 15 at a high speed in the air supply direction based on the detection by the speed sensor 13 or the wind speed sensor 14 described above. Alternatively, it is rotated at a low speed and its rotation is controlled.

The air supply fan 15 is rotated at high speed or low speed based on the detection by the speed sensor 13 or the wind speed sensor 14, and the air is supplied from the intake port 8 a of the supply pipe 8 by the air supply force of the air supply fan 15. Air A to the flow restrictor 9
And the exhaust gas G exhausted from the exhaust port 7b of the exhaust pipe 7 is sucked and exhausted to the atmosphere side by the negative pressure generated in the flow restrictor 9, so that the same operation and effect as in the first embodiment are obtained. Can be played. Since the air A sucked from the intake port 8a of the supply pipe 8 is positively supplied to the flow restrictor 9, the air A is supplied using the running force of the large vehicle 2 as in the first embodiment. As compared with the method, the supply amount of the air A is increased. Since a large amount of air A is continuously supplied to the flow restrictor 9, the flow velocity of the air A when passing through the flow restrictor 9 is further increased, and the negative pressure generated at the exhaust port 7b of the exhaust pipe 7 increases. Exhaust gas G exhausted from the exhaust port 7b of the exhaust pipe 7 can be positively sucked, the exhaust efficiency is improved, and the output and fuel efficiency of the engine 3 are improved.

Further, since the supply amount of the air A is increased or decreased in accordance with the rotation speed of the air supply fan 15, the flow rate of the air A is increased or reduced when passing through the flow restrictor 9, and the exhaust pipe 7
The negative pressure generated at the exhaust port 7b can be increased or decreased, and the exhaust resistance can be variably adjusted. Since the air A is forcibly supplied to the flow restrictor 9 by the air supply force of the air supply fan 15 and the exhaust gas G is positively sucked by the negative pressure generated at the exhaust port 7b of the exhaust pipe 7, the large vehicle When the engine 3 is idling while the vehicle 2 is stopped, exhaust gas G exhausted from the exhaust port 7b of the exhaust pipe 7 can be positively sucked, which is generated in the exhaust system as compared with the first embodiment. Exhaust resistance is reduced and engine 3
Output and fuel efficiency are improved. In addition, since the supply amount of the air A is variably adjusted according to the traveling speed of the large vehicle 2 and the rotation speed of the engine 3, a high output is obtained during traveling and idling, and fuel efficiency is improved.

The air supply fan 15 described above may be arranged on the rear side of the flow restrictor 9 formed in the supply pipe 8. Further, the damper 10 and the air supply fan 15 may be used in combination, and the traveling speed of the large vehicle 2 and / or the engine 3
The supply amount of the air A can be variably adjusted according to the rotation speed of the engine 3, and the output of the engine 3 and the fuel consumption can be easily adjusted.

FIG. 6 shows a fourth embodiment in which the flow restrictor 19 disposed in the supply pipe 8 is protruded and retracted to an arbitrary height, and the intensity of the negative pressure generated at the exhaust port 7b of the exhaust pipe 7 is variably adjusted. Exhaust system 1
The flow restricting portion 19 is opposed to the exhaust port 7 b of the exhaust pipe 7, is held so as to be able to protrude and retract from the storage portion 20 formed on the inner peripheral surface of the supply pipe 8, and is disposed on the outer surface of the same. The actuator 21 is connected to the speed sensor 13 or the wind speed sensor 1 described above.
4, the flow restrictor 19 is caused to protrude and retract in the radial direction to adjust the flow rate of the air A passing through the restrictor 19a.

During high-speed running, the flow rate of the air A sucked into the supply pipe 8 is reduced by the flow restrictor 19, and the exhaust gas discharged from the exhaust port 7 b of the exhaust pipe 7 by the negative pressure generated in the flow restrictor 19. Since the gas G is sucked and exhausted to the atmosphere side, the same operation and effect as in the first embodiment can be obtained. Further, based on the detection by the speed sensor 13 or the wind speed sensor 14, the flow restrictor 19 is moved in and out, and the flow rate of the air A is variably adjusted according to the traveling speed of the large vehicle 2 and / or the rotation speed of the engine 3. The flow rate of the air A is increased or reduced in accordance with the flow rate, and the exhaust port 7 of the exhaust pipe 7 is
b can increase or decrease the negative pressure generated in
Adjustment of negative pressure and exhaust resistance can be easily performed. The damper 10 and the air supply fan 15 described above may be used in combination.

FIG. 7 shows that the air flow guide 38 pivotally attached to the exhaust side end of the exhaust pipe 7 is rotated by the wind pressure applied during high-speed running, so that the exhaust port 7b of the exhaust pipe 7 and the air flow guide 38 are opposed to each other. 5 shows an exhaust device 1 according to a fifth embodiment in which the flow rate of the air A is reduced by a flow restricting section 40 formed on the surface;
8 indicates that the air A flowing along the side of the vehicle body 2a is
b is formed into a shape (for example, a cone shape, a trumpet shape, a cubic shape, etc.) supplied to b, and a blade portion 38 for blowing air A applied during high-speed traveling is provided on an exhaust side edge thereof.
a. The inner peripheral surface of the airflow guide 38 is formed in a shape gradually narrowing from the intake side to the exhaust side,
The flow restrictor 40 is formed to be the narrowest.

Further, the base end of the air flow guide 38 is rotatably pivoted by a support shaft 39 which is mounted on the exhaust end of the exhaust pipe 7, and is brought close to the exhaust port 7b at a predetermined interval. The air flow guide 38 is rotatably provided at an opposing position of the air outlet 7b and a retracted position retracted to the side of the exhaust port 7b.
Thus, it is urged to rotate in the evacuation direction with a stronger force than the wind pressure applied at the time of middle and low speed traveling, and is provided rotatably with respect to the opposing position by the wind pressure applied at the time of high speed traveling.

During high-speed running, air A is blown against the airflow guide 38 and the blade portion 38a, and the airflow guide 38 is rotated to an opposing position (shown by a solid line in FIG. Air A taken in along the inner surface
Is reduced by the flow restrictor 40, and the exhaust gas G exhausted from the exhaust port 7b of the exhaust pipe 7 is sucked by the negative pressure generated at that portion and exhausted to the atmosphere side, which is equivalent to the first embodiment. Action and effect can be obtained. When the wind pressure is reduced during running at a low speed, the airflow guide 38 is returned to the retracted position (indicated by a phantom line in the figure) and returns to the exhaust position to exhaust the exhaust gas G from the exhaust port 7b of the exhaust pipe 7. During high-speed running, the output of the engine 3 and fuel efficiency are improved. Further, based on detection by the speed sensor 13 or the wind speed sensor 14, the actuator 41 connected to the end of the support shaft 39.
, The airflow guide 38 may be turned to the turning position and the retreat position.

FIG. 8 shows an exhaust port 8c formed on the inner peripheral surface of the supply pipe 8 facing the exhaust port 7b of the exhaust pipe 7.
6C shows an exhaust device 1 according to a sixth embodiment in which a damper 8d is provided so as to be openable and closable in opposition to FIG. c. It is urged in the closing direction (indicated by a solid line in the figure) against the applied wind pressure, and is provided to be openable in the opening direction (indicated by the phantom line in the figure) by the wind pressure applied during high-speed traveling. Further, for example, the damper 8d may be opened and closed by an actuator (not shown) such as a solenoid or a servomotor.

The damper 8d is moved in the closing direction by a wind pressure or an actuator applied at the time of high-speed running, and the exhaust port 8c is closed, so that the flow rate of the air A when passing through the flow restrictor 9 formed in the supply pipe 8 is increased. And the exhaust gas G exhausted from the exhaust port 7b of the exhaust pipe 7 is positively sucked by the negative pressure generated in that portion. When the wind pressure becomes weak during running at a low speed (for example, when the engine brake is applied), the damper 8d moves in the opening direction and the exhaust port 8c is opened, so that the exhaust is discharged from the exhaust port 7b of the exhaust pipe 7. The exhaust gas G is exhausted to the atmosphere via the exhaust ports 8b and 8c of the supply pipe 8, and the exhaust resistance becomes somewhat higher than when negative pressure is generated, so that a braking action by the engine brake is obtained.

In the above-described first to fifth embodiments, the supply pipe 8 is connected to the exhaust port 7b of the exhaust pipe 7. However, as shown in FIG. Tube 7
The supply pipe 8 of the first to fourth embodiments may be connected to the exhaust-side end of the first pipe through a branch pipe 7c. For example, in high-speed running, switching means (for example, a switching means provided at a connection section of the branch pipe 7c) Since the exhaust gas G is switched and supplied from the exhaust pipe 7 to the supply pipe 8 by the electromagnetic valve), the same operation and effect as the above-described embodiment can be achieved.

As shown in FIG. 10, the supply pipe 8 of the first to fourth embodiments is connected to the exhaust pipe 7 on the front side of the silencer 6 via a branch pipe 7d. Often,
The exhaust pipe 7 is switched by switching means provided at the connection of the branch pipe 7d.
The exhaust gas G is switched and supplied to the supply pipe 8 from below, and the exhaust sound is reduced or silenced by the silencer 6 connected to the exhaust side of the supply pipe 8, so that the same operational effects as those of the above-described embodiment can be obtained. .

In the second embodiment, the damper 10 is rotated to an arbitrary opening / closing angle. For example, as shown in FIG. 11, the damper 10 is opened / closed in the radial direction by an actuator (not shown). FIG. 12
, A plurality of closing plates 10a constituting the damper 10 may be opened and closed in the radial direction by an actuator (not shown).

In the correspondence between the configuration of the present invention and the above-described embodiment, the moving object of the present invention corresponds to the large vehicle 2 of the embodiment.
38, the flow restrictor means comprises flow restrictors 9, 19,
40, the flow control means corresponds to the damper 10 and the actuator 12, and the air supply means corresponds to the air supply fan 1
5. Corresponding to the rotation motor 17, and the throttle amount adjusting means corresponds to the flow throttle unit 19, the storage unit 20, and the actuator 21, but the present invention is not limited to the configuration of the above-described embodiment. .

In the above-described embodiment, the intake port 8 of the supply pipe 8 is moved in a direction corresponding to the traveling direction (forward direction) of the large-sized automobile 2.
For example, the entire supply pipe 8 or only the intake port 8a is provided so as to be capable of reversing forward and backward, and when the large vehicle 2 moves backward, the intake port 8a of the supply pipe 8 is reversed backward to supply. By causing the air A to flow toward the intake port 8a of the pipe 8, the effect of sucking and exhausting the exhaust gas G can be obtained although the suction force is weaker than at the time of high-speed running.

In the embodiment, the example in which the device of the present invention is provided in the exhaust system of the engine 3 mounted on the large vehicle 2 such as a truck or a bus has been described. An exhaust system of an engine mounted on a moving object such as a bus, a passenger car, a minicar, an airplane, a ship, or the like may be provided, and the same operational effects as those of the embodiment can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing an exhaust system of a large vehicle equipped with an exhaust device of a first embodiment.

FIG. 2 is a side view showing an exhaust system provided with an exhaust device.

FIG. 3 is a cross-sectional view showing a state in which exhaust gas is sucked by an exhaust device.

FIG. 4 is a cross-sectional view illustrating a state of suction of exhaust gas by an exhaust device of a second embodiment.

FIG. 5 is a cross-sectional view illustrating a state in which exhaust gas is suctioned by an exhaust device according to a third embodiment.

FIG. 6 is a cross-sectional view illustrating a state in which exhaust gas is suctioned by an exhaust device according to a fourth embodiment.

FIG. 7 is a cross-sectional view illustrating a state in which exhaust gas is suctioned by an exhaust device according to a fifth embodiment.

FIG. 8 is a sectional view showing an exhaust state of exhaust gas by an exhaust device of a sixth embodiment.

FIG. 9 is a side view showing another example in which the supply pipe is connected to the rear of the silencer.

FIG. 10 is a side view showing another example in which a supply pipe is connected in front of a silencer.

FIG. 11 is a sectional view showing another opening / closing operation of the damper.

FIG. 12 is a sectional view showing another opening / closing operation of the damper.

[Explanation of symbols]

 A ... Air G ... Exhaust gas 1 ... Exhaust device 2 ... Large vehicle 3 ... Engine 4 ... Manifold 5 ... Catalyst converter 6 ... Silencer 7 ... Exhaust pipe 7b ... Exhaust port 8 ... Supply pipe 8a ... Intake ports 8b and 8c ... Exhaust ports 8d Damper 9, 19, 40 Flow restrictor 10 Damper 12, 21 Actuator 15 Air supply fan 38 Airflow guide

Claims (6)

[Claims] An exhaust system for exhausting exhaust gas to the atmosphere via an exhaust pipe connected to an engine when the engine is mounted on a moving object or when the engine is idling. Air supply means for supplying air in a direction substantially perpendicular to the exhaust port of the pipe, and for narrowing the flow rate of air supplied to the exhaust port opposite to the exhaust port of the exhaust pipe. Exhaust device for a moving object engine provided with a flow rate restricting means. 2. The air supply means is connected to an exhaust port of the exhaust pipe and connected to a supply pipe for supplying air in a direction substantially perpendicular to the exhaust port, and is formed at one end of the supply pipe. The moving object is opened toward the moving direction of the moving object, and the exhaust port formed on the other end side is opened toward the side of the moving object. 2. The exhaust device for a moving object engine according to claim 1, further comprising a flow restricting portion provided to oppose the exhaust port to reduce a flow rate of the air supplied toward the exhaust port. 3. An air flow guide for guiding air in a direction substantially perpendicular to an exhaust port of the exhaust pipe, wherein the air supply means is brought close to the exhaust port. The air outlet is configured to be movable between an opposing position and a retracted position retracted to a side of the exhaust port. 2. The exhaust device for a moving object engine according to claim 1, further comprising a flow restrictor for restricting the flow. 4. An exhaust system for a moving object engine according to claim 1, further comprising a flow rate adjusting means for variably adjusting an amount of air supplied to an exhaust port of said exhaust pipe to an arbitrary supply amount. 5. The moving object engine according to claim 1, further comprising a throttle amount adjusting means for variably adjusting air supplied to an exhaust port of said exhaust pipe to an arbitrary throttle amount. Exhaust device. 6. An air supply means for supplying air in a direction substantially orthogonal to an exhaust port of said exhaust pipe. Exhaust system for moving objects.