JP3033136U - Exhaust system for automobile - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To create a place where a flow is fast and a pressure is low in an exhaust gas passage, and the gas flowing in a side passage is drawn in by a Venturi effect to accelerate the exhaust gas so that the exhaust gas is passed from the engine. Suck it out to reduce the load on the engine and increase horsepower. SOLUTION: A first pipe 1 having an inlet pipe having a circular cross section and gradually expanding to have an elliptic shape, and an inlet is connected to a center of a divided outlet of the first pipe, and a portion between the central portion and the outlet is connected. And a second pipe 2 having a narrowed portion having a small cross-sectional area, and an inlet connected to the divided outlet of the first pipe adjacent to the inlet of the second pipe, and the outlet is the second pipe. A plurality of third pipes 3, 3 adjacent to the outlet of the
A fourth pipe 4 which is connected to the outlet of the second pipe and the outlet of the third pipe, and which discharges the exhaust gas that joins at the connection point into the atmosphere, and a branch part in the middle of the third pipe. And a fifth pipe 5 whose branching portion is connected to the narrowing portion of the second pipe.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a vehicle exhaust system for releasing exhaust gas of a vehicle engine into the atmosphere.

[0002]

[Prior art]

 Conventionally, exhaust gas exhaust devices of this type include those that simply reduce the noise accompanying exhaust (for example, the one shown in the perspective view of FIG. 4), and those that minimize the pollution caused by exhaust gas. However, there was nothing that tried to improve the combustion efficiency of the engine. In FIG. 4, 11 is a pipe connected to the engine for discharging exhaust gas into the atmosphere, 12 is a sound deadening layer formed of a double cylinder coaxial with the pipe 11, and Contains a glass wool sound deadening material (not shown).

[0003]

[Problems to be solved by the invention]

 An object of the present invention is to provide an exhaust system for an automobile, which can increase the combustion efficiency of an engine by positively increasing the speed at which exhaust gas is released into the atmosphere.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the invention of claim 1 is an exhaust system for a motor vehicle, which is formed by connecting a plurality of pipes having different shapes in order to discharge gas discharged from an engine to the atmosphere. , The cross section of the pipe is circular and the inlet is gradually widened and the outlet is oval, and the inlet is connected to the center of the outlet of the first pipe, and the pipe is connected from the center to the outlet. A second pipe having a narrowed portion whose cross-sectional area is gradually reduced from the front and back, and an inlet connected to an outlet of the first pipe adjacent to an inlet of the second pipe, and the outlet is connected to the outlet. A plurality of third pipes connected adjacent to the outlets of the second pipes, and an exhaust gas whose inlets are connected to the outlets of the second pipes and the outlets of the third pipes and which merge at the connection points. A fourth pipe that releases gas into the atmosphere, Are al configuration.

According to a second aspect of the present invention, in the first aspect, a narrowed portion is provided substantially in the center of the second pipe, a branch portion is provided in the middle of the third pipe, and the branch portion is provided with the branch portion. It is characterized in that a fifth pipe connected to the throttle portion of the second pipe is provided. A third aspect of the present invention is characterized in that, in the first aspect, a narrowed portion is provided near the outlet of the second pipe, and the sectional area of the outlet is made wider than the sectional area of the inlet of the fourth pipe.

[0006] According to the present invention, the diaphragm portion of the second pipe (D ₁ in FIG. 1, D ₂ of FIG. 5, D ₄ in FIG. 6), the passage of gas flow smoothly cross-sectional area decreases , Forming the Venturi. There, the exhaust gas is reasonably accelerated and the pressure drops due to the Venturi effect. Therefore, the converging point from another pipe immediately after passing through the constricted part or the constricted part (D ₁ in FIG. 1 that merges from the fifth pipe, D ₄ in FIG. 6 that merges from the third pipe, and etc. the D ₃₎ of FIG. 5 which joins the pipe to suck strongly another pipe (fifth pipe 5,5 or third exhaust gas pipe 3,3) during the merging. Along with this, the flow near the inlet of the device also becomes faster, and the residual exhaust gas in the engine is also sucked out. Therefore, the exhaust gas is not just emitted from the engine but is sucked out, reducing the load on the engine and producing a horsepower improving effect.

[0007]

[Embodiment of the invention]

 Hereinafter, the present invention will be described in detail with reference to the drawings and the like. FIG. 1 is an explanatory view showing a main part of an example of an exhaust system for an automobile according to the present invention, which is cut along a flat plane to a flat plane. FIG. 2 is a plan view showing an external appearance example of the embodiment including the main part of FIG. 1. FIG. 3 is a perspective view of the external appearance of the embodiment of FIG. As shown in FIG. 2, the exhaust system for an automobile of the present invention discharges exhaust gas into the atmosphere, and a first pipe 1 which is connected to an exhaust gas output port of an engine and forms an exhaust gas input part of the device. Between the fourth pipe 4 forming the exhaust gas output part, the exhaust accelerating part 10 incorporating the first to third or first to third and fifth pipes is inserted.

The first pipe 1 is a round pipe near the inlet and becomes an elliptical pipe in the middle, and the cross section gradually increases from the inlet toward the exhaust acceleration unit 10. In FIG. 2, m is a cross section of the first pipe 1 taken along the line MM, and n in the drawing is a cross section taken along the line NN. FIG. 1 shows the internal structure of the exhaust acceleration unit 10 of FIG. In FIG. 1, A ₁ indicates the internal space of the first pipe 1. D ₁ indicates a narrowed portion of the inner space of the second pipe 2. B ₁ , B ₂ , B ₃ , and B ₄ represent internal spaces at the respective positions of the third pipes 3 and 3. E ₁ indicates the internal space of the fourth pipe 4. C ₁ and C ₂ indicate the internal space of the fifth pipe 5.

In the present embodiment, the outlet of the first pipe 1 is divided into three parts, the central part is connected to the second pipe 2, and the left and right branch parts are connected to the third pipes 3, 3. The inlet of the fourth pipe 4 is connected at its central portion to the outlet of the second pipe 2, and its left and right merging portions are connected to the outlets of the third pipes 3, 3. A branch portion is provided between B ₁ and B _{2 and} between B ₃ and B ₄ in the middle of the third pipes 3 and ₃ , and the outlets of the fifth pipes 5 and 5 branched there are The second pipe 2 is connected to a confluence point D ₁ provided in the narrowed portion of the internal space.

In FIG. 1 and FIG. 2, the exhaust gas that has entered the first pipe 1 is crushed vertically while passing through the first pipe 1, and along the elliptical pipe that spreads laterally A ₁ Reach. The central gas flow from the first pipe 1 into the second pipe 2 goes to D ₁ , and the gas spread to the left and right goes into the third pipes 3, 3 to B ₁ and B ₃ . Since D ₁ has a narrow Venturi shape with narrow passages, the gas is condensed, and the passage speed is increased and the pressure is reduced. Therefore, the gas of B ₁ and B ₃ passes through the fifth pipe 5,5 by the pressure difference between the gas in the _{D 1 (C 1, C 2} ) is sucked into D _1.

In the fourth pipe 4, the remaining gas (B ₂ and B ₄ gas) of the third pipe 3 and 3 and the gas (gas from D ₁ ) at the outlet of the second pipe 2 are collected. Emit all exhaust gases into the atmosphere via E ₁ . Thus, in venturi effect of _{D 1, B 1, B 3} , C 1, by the action of the gas in the C ₂ is sucked rapidly Hayamari also flow A ₁ to E _1, the residual exhaust gas in the engine Is also sucked out. Therefore, exhaust gas is not just exhausted but exhausted, and horsepower increases without putting a burden on the engine.

FIG. 5 is an explanatory view showing a modified example of the embodiment of FIG. 1, and is a cross-sectional view cut in the same manner as in FIG. The exhaust gas accelerating portion 20 of FIG. 5 has the same position (D ₂ ) as the throttle portion of the second pipe 22 as that of FIG. 1, but corresponds to the fifth pipes 5 and 5 of the embodiment of FIG. There is nothing. The merging of the second pipe 22 with the third pipe 23, 23 only takes place at D ₃ .

FIG. 6 is an explanatory view (cross-sectional view) showing another modification of the embodiment of FIG. In the exhaust gas accelerating portion 30 of FIG. 6, the position (D ₄ ) of the throttle portion of the second pipe 32 is closer to the exhaust gas outlet side than that of FIG. 1, and also corresponds to the fifth pipes 5 and 5 of FIG. There is nothing. The merging of the second pipe 32 and the third pipe 33, 33 is only done at D ₄ . The modified examples of FIGS. 5 and 6 are slightly inferior in effect to those of FIG. 1, but have the advantages of a simple structure, easy manufacture, and low cost.

[0014]

[Effect of the invention]

 As described in detail above, according to the exhaust system for an automobile of the present invention, a portion of low pressure is created by making the gas flow faster in the exhaust gas passage, and by utilizing the Venturi effect there By drawing in and accelerating the gas flowing through the side passage of the engine, not only the exhaust gas is discharged, but it is also sucked out from the engine to reduce the load on the engine and increase horsepower.

[Brief description of the drawings]

FIG. 1 is an explanatory view (cross-sectional view) showing a main part of an embodiment of the present invention.

FIG. 2 is a plan view showing an example of an external appearance of an embodiment including a main part of FIG.

FIG. 3 is a perspective view of the appearance of the embodiment of FIG.

FIG. 4 is a perspective view showing an example of a conventional automobile exhaust device.

FIG. 5 is an explanatory view (cross-sectional view) showing a main part of a modified example of FIG.

FIG. 6 is an explanatory view (cross-sectional view) showing a main part of another modification of FIG.

[Explanation of symbols]

 1 1st pipe 2, 22, 32 2nd pipe 3, 23, 33 3rd pipe 4 4th pipe 5 5th pipe 10, 20, 30 Exhaust acceleration part

Claims (3)

[Utility model registration claims] 1. An exhaust system for an automobile, comprising a plurality of pipes of different shapes connected to each other to release gas discharged from an engine to the atmosphere, wherein the pipe has a circular cross section with a gradually widened inlet. A first pipe having an elliptical outlet and an inlet connected to the center of the outlet of the first pipe, and the cross-sectional area gradually decreases from the front to the rear between the center of the pipe and the outlet. A second pipe having a narrowed portion, an inlet of the first pipe connected to the outlet of the second pipe adjacent to the inlet of the second pipe, and an outlet of the second pipe connected to the outlet of the second pipe. A plurality of third pipes, and a fourth pipe whose inlet is connected to the outlet of the second pipe and the outlet of the third pipe, and which discharges exhaust gas joined at the connection point into the atmosphere. Exhaust systems for automobiles including ,. 2. The exhaust system for an automobile according to claim 1, wherein the second pipe is provided with a throttle portion substantially in the center thereof, and the third pipe is provided with a branch portion in the middle thereof. An exhaust system for an automobile, characterized in that a fifth pipe is provided to connect the pipe to the throttle portion of the second pipe. 3. The exhaust system for an automobile according to claim 1, wherein a narrowed portion is provided near the outlet of the second pipe, and the cross-sectional area of the outlet is wider than the cross-sectional area of the inlet of the fourth pipe. An exhaust system for an automobile, which is characterized in that