JPS6026116A - Exhaust system for automobile - Google Patents

Abstract

PURPOSE:To improve durability of a bellows by arranging the bellows perpendicularly right under an exhaust manifold of a lateral engine and forming an exhaust pipe, connected to the lower end of the bellows, into a curved pipe with the front end part bending rearward of a car body and having this curved pipe elastically supported by means of an engine. CONSTITUTION:Bellows 3 is provided nearly perpendicularly in the vicinity of a position right under an exhaust manifold 2 of a lateral engine 1, while an exhaust pipe 4 in the understream of the bellows 3 is supported by the engine 1, tightly connected to the exhaust manifold, through a rubber hanger 6 which is an elastic support member. The front end part of the exhaust pipe 4 connected to the lower end of the bellows 3 forms a curved pipe bending rearward of a car body, and the downstream end of this curved pipe is extended to below the engine, and further, a continuing middle part of a horizontal section 4a of the exhaust pipe is supported by means of a rubber hanger 6. Thus, durability of the bellows 3 is improved.

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to an automotive exhaust system.

In a conventional horizontal engine 1-1 vehicle (front engine, front drive type), the exhaust gas '#3' ( The bellows assembly 4' (hereinafter referred to as the bellows body) installed in the middle of the heat shield plate 3a4 is installed directly below the engine 1' or at a position almost parallel to the ground at the rear of the engine, so it can be easily used on rough roads. In order to prevent this, the outer circumference of the bellows 4a/ is covered with a braided blade made of SUS wire with a diameter of 0.4~Q and 5mm, as shown in Fig. It needed to be protected and protected.

Also, since the bellows main body 4' is located at a low position of about 1501° from the ground, it is necessary to lower the surface temperature of the outermost part so that it will not cause a fire even if it comes into contact with combustible materials at high temperatures. 4 Internal interlock of a/4
c' fa: It became necessary to insert the bellows body/1', which was very costly.

The present invention aims to solve the above-mentioned conventional drawbacks (-1 and measure the durability of the bellows and Jul=stability of the trachea) and to provide an inexpensive bellows.

In other words, to prevent the bellows from being directly deformed or damaged by grounding or flying stones, and to prevent the bellows from coming into direct contact with combustible materials, a bellows-coated protective blade is installed, and an interlock is installed to measure the temperature drop on the bellows surface. etc. will be omitted. However, by arranging the bellows directly below the exhaust manifold in this way, it is quite conceivable that the entire length of the bellows will be exhausted, and as mentioned above, the surface blade coating, interlock mower, 1!
(As a result, the strength of the bellows itself is significantly lower than that of the conventional horizontal arrangement.

Therefore, in order to make the bellows itself more durable and more practical by reinforcing its strength with other parts, an elastic support member such as a rubber hanger was installed as part of the engine to connect the exhaust pipe downstream of the bellows. This allows for several passages to be made through the exhaust pipe, and at the same time improves the stability of the exhaust pipe.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 to 5.

Figure 3 is a schematic side view of the present invention showing the bellows and comb bunker, and Figure 1 is the engine heavy body (hereinafter referred to as the engine).
, 2 is an exhaust manifold connected to each cylinder of the Niasin, and is provided to protrude from the engine toward the front of the vehicle body. 3 is a bellows, 4 is an exhaust pipe, 5 is a heat shield plate, 6 is a rubber hanger, 7 is a front part 111 body, and 8 is a bumper.

The bellows 3 does not have conventional covered blades, interlocks, etc., and is arranged almost vertically in direct proximity to the exhaust manifold 2.
It is supported by the engine which is rigidly connected to the exhaust manifold 2 by a rubber hanger 6, which is a flexible load support member.

The front end of the exhaust pipe 4 connected to the lower end of the bellows 3 forms a curved pipe that curves toward the rear of the vehicle body, and the downstream end of the curved pipe extends below the engine and continues into the horizontal part 4a of the exhaust pipe.
The middle part is supported by rubber at 2°C/Ga-6.

In addition, an L-shaped bracket a is fixed to the opposite side of the manifold 2 of the com bunker 6 engine j with a bolt f, and the base is fitted and tightened to the outer periphery of the exhaust pipe water 3F section 4a. Several rubber strips (e) are applied with adhesive between the sheet metal fittings (c) and (d), which are fixed to the metal fittings (c and d) facing each other with bolts. 3. It absorbs the displacement of the exhaust pipe.

That is, considering the case without the rubber hanger, as shown in Fig. 4, when the car starts, the engine 1 and exhaust manifold 2 tilt backward as shown by the dashed line, and accordingly, the upper part of the bellows 3 also tilts backward. The exhaust pipe 4 is also displaced from the rest position to the position A. When retracting, each part is displaced in the opposite direction to the above as shown by the broken line.

Even when the IC rubber hanger 6 is provided as shown in Fig. 5, when starting or reversing as shown in Fig. 4, the bellows 3
Although each part of the exhaust pipe 4 is temporarily displaced in the same way as described above, it is absorbed by the rubber material e of the rubber hanger 6, and the amount of displacement is small and it returns to its original position and becomes stable.

Next, if there is no rubber hanger when driving on a rough road, the amount of displacement due to the rough road is mainly in the exhaust pipe 40 portion, but if there is a rubber hanger, this will suppress the displacement of the exhaust pipe 4. , the amount is small. Note that the rubber hanger 6 is not limited to the one shown, and other suitable elastic support members may be used.

As described above, in the present invention, the bellows that can be seen in the 41F trachea is placed in a position directly below the exhaust manifold in a nearly vertical direction, so the bellows is placed in a position that is almost parallel to the ground directly behind the engine (1) There is no risk of the bellows coming into direct contact with combustible materials, and there is no possibility of the bellows being directly deformed by contact with the ground or flying stones.
There will be no damage such as damage.

(■) Also, according to (1) above, the bellows can be formed without using blades to protect the bellows or interlocks to lower the temperature of the bellows surface, so a very inexpensive bellows is provided. be able to.

(1) Furthermore, in the present invention, since the exhaust pipe on the downstream side of the bellows is connected to a part of the engine body via an elastic support member such as a rubber hanger, the exhaust pipe on the downstream side of the bellows is (upper end) and exhaust '#sen (lower end tXj
The mode of relative displacement with () changes from shearing to free bending, and at the same time, the amount of displacement itself can be reduced, resulting in great durability.
It is possible to measure the increase in the amount of fuel, and at the same time, the stability of the exhaust pipe is also improved, and it exhibits many practical effects such as 4J leakage.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a conventional automobile exhaust stem in which the bellows body attached to the exhaust pipe is located directly under the engine, and Figure 2 is a partial longitudinal section showing the structure of the bellows body in Figure 1. 3 is a schematic side view of an embodiment of the present invention, and FIG. 4 is a schematic side view of an embodiment of the present invention, and FIG. 4 is a diagram of the engine and exhaust manifold at the time of starting and reversing the vehicle when there is no rubber hanger on the J non-trachea in FIG. , an explanatory diagram of the displacement state of the bellows, and the exhaust t. Figure 5 shows that when a rubber hanger is installed, the relative displacement between the upper and lower ends of the bellows changes from shearing to free bending and stabilizes due to the installation of the rubber hanger. It is an explanatory diagram showing the state. 1: Engine body 2: jJI”A manifold 3:
Bellows 4: Exhaust pipe = 1a: ;l no 1 trachea horizontal iff≦ 5: Heat shield plate 6: Rubber hanger (1 bullet: support member) 7: Front vehicle body

Claims (1)

[Claims] (In an exhaust system in which a bellows is interposed in an exhaust pipe that communicates with an exhaust manifold installed in the engine of a car equipped with an engine, the bellows is located directly from the exhaust manifold and is arranged almost vertically, and The exhaust pipe connected to the lower end of the bellows is a curved pipe whose front end bends m toward the rear of the vehicle body, and the middle part of the horizontal section of the tracheal pipe extending toward the rear of the curved pipe is elastically supported by an elastic material such as rubber. An exhaust system for an automobile characterized in that the engine body (r) is rigidly connected to the manifold by a member.