JPH06102971B2 - Exhaust system mounting device in vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system mounting device in a vehicle in which an engine is mounted horizontally with a plurality of exhaust ports facing forward.

(Prior Art) Conventionally, it is known that an exhaust manifold of an engine is formed of a cast product, and an exhaust pipe connected to the exhaust manifold is extended rearward from a front side of the engine through a lower side thereof. , The exhaust pipe is generally supported at its upstream end to the engine via the exhaust manifold, and its downstream end to the vehicle body side via another exhaust pipe connected to the engine via a flexible tube. To do.

In addition, in order to reduce the weight of the exhaust manifold, JP-A-54-134
It is also known to construct an exhaust manifold by welding a branch pipe composed of a plurality of pipe materials connected to a plurality of exhaust ports of an engine to a collective case such as a press-formed product on the downstream side, as seen in Japanese Patent Publication No. 211. There is. Further, in this product, an exhaust catalyst is built in a collecting case to form an exhaust manifold with a catalytic converter.

(Problems to be Solved by the Invention) By the way, in the exhaust manifold made by casting, since it is inevitable to make the wall thickness to some extent, a relatively strong one can be obtained.
Although supporting rigidity of the exhaust system can be obtained even if the exhaust pipe connected to this is supported as in the prior art described above, in the exhaust manifold made of welding as described above, the exhaust pipe connected to this is supported as in the prior art. In this case, the supporting rigidity of the exhaust system may not be sufficiently obtained and an excessive force may be applied to the welded portion, which is an important problem especially when using an exhaust manifold with a catalytic converter.

An object of the present invention is to provide a device that solves the above problems.

(Means for Solving the Problems) In order to achieve such an object, the present invention is a device for mounting an exhaust system in a vehicle in which a plurality of exhaust ports are forwardly mounted and an engine is horizontally installed. An exhaust manifold with a catalytic converter is constructed by welding a branch pipe consisting of a plurality of pipes connected to the port to a collective case containing an exhaust catalyst, and the exhaust pipe connected to the collective case is passed from the front of the engine to the lower side thereof. In the case of extending rearward, a first stay is arranged between an upper front surface of a cylinder block of the engine and an engine facing surface of the collecting case, and the collecting case is attached to the cylinder by the first stay. The exhaust pipe is connected to and supported by a block, and the exhaust pipe is supported by a second stay attached to a lower rear portion of the engine.

(Operation) Since the collective case containing the exhaust catalyst, which is a heavy object, is supported by the cylinder block via the first stay, an unreasonable force due to the weight of the collective case does not act on the welded portion of the branch pipe.
Support rigidity of the exhaust manifold can also be secured.

By the way, the upper part of the cylinder block has a narrow width in the front-rear direction, and a relatively wide dead space is formed between the collective case and the upper part of the front surface of the cylinder block.
Since this dead space is used as the space for disposing the first stay, the space efficiency is improved and the entire engine can be made compact.

Further, in addition to the first stay, the second stay at the lower rear portion of the engine can support the exhaust system in the longest span in the engine, which is a single structure, so that the supporting rigidity of the exhaust system is further enhanced. In addition, unlike the case where the exhaust manifold and the exhaust pipe are supported by the engine and the vehicle body having different vibration systems, an unreasonable force does not act on the exhaust system due to the difference in vibration.

(Embodiment) In the drawings, (1) shows an in-line four-cylinder engine, (2) shows an exhaust manifold, (3) shows a downstream exhaust pipe connected to the exhaust manifold (2), and the exhaust manifold (2) shows A set of a press-formed product containing a branch pipe (5) made of a plurality of stainless steel pipes connected to each exhaust port (4) of the engine (1) and an exhaust catalyst (6) downstream thereof. A cylinder head (1) of the engine (1) is formed by a single horizontally long flange (8) which is composed of a case (7) and is attached to the upstream end of each branch pipe (5).
The exhaust pipe (3) is connected to the collecting case (7) through a flange (9), and the exhaust pipe (3) is removed from the front face of the engine (1) by screwing to the front face of a). It is arranged to extend rearward through the lower side, that is, the lower side of the oil pan (1b).

In the figure, the collecting case (7) includes a collecting chamber member (7a) to which the downstream ends of the branch pipes (5) are connected, and a half-split storing case member (7b) for storing the exhaust catalyst (6). )
(7b), and these members (7a), (7b) and (7b) are weld-bonded after the exhaust catalyst (6) is housed inside.

In the drawing, (10) is a hole for mounting an O ₂ sensor, (11) is a hole for mounting an exhaust gas thermometer, and (12) is a screw hole for mounting a hot air cover.

Here, the exhaust manifold (2) is the collecting case (7).
In order to support the exhaust pipe (3) on the second stay (14) mounted on the lower rear part of the engine (1), the exhaust pipe (3) is supported by the first stay (13) mounted on the upper front part of the engine (1). did.

More specifically, the mounting bosses (15) are respectively attached to the upper front part and the lower rear part of the cylinder block (1c) of the engine (1).
The first and second stays (13) (1) (1) made of a plate material projecting (15) and formed in each of the mounting bosses (15) in a substantially L shape in a side view.
4) is screwed to the upper ends of the vertical portions (13a) (14a), and the collecting case (7) is attached to the horizontal portion (13b) of the first stay (13) from the collecting chamber member (7a). The exhaust pipe (3) was screwed to the horizontal part (14b) of the second stay (14) at the flange part provided on the cover (3a) on the outer periphery of the second stay (14).

In the illustrated example, curved portions (13c) and (14c) are formed on the vertical portions (13a) and (14a) of the first and second stays (13) and (14), respectively, and the stays (13) and (14) are formed. 14) the respective curved parts (13
c) Due to the elasticity of (14c), it is elastically deformable in the direction of the arrow shown in FIG. 1 so that the exhaust manifold (2) and the exhaust pipe (3) can be supported so that unreasonable force due to thermal expansion does not act. .

Next, the operation of the embodiment will be described. A collection case of the exhaust manifold (2) through the first and second stays (13) and (14) on the front upper part and the rear lower part of the engine (1), that is, the cylinder lock (1c). By supporting (7) and the exhaust pipe (3) respectively, the exhaust manifold (2) and the exhaust pipe (3) are supported with the longest span with respect to the cylinder block (1c) which is a single structure. Therefore, the exhaust system is attached with high support rigidity, and no unreasonable force acts on the welded portion between the branch pipe (5) and the collecting case (7).

When the curved portions (13c) (14c) are formed on the first and second stays (13) (14) to be elastically deformable as in the embodiment, the exhaust manifold (2) and the exhaust pipe (3) are heated. This is advantageous because unreasonable force due to expansion does not act and cracking of the exhaust manifold (2) and the exhaust pipe (3) can be prevented.

(Effects of the Invention) As described above, according to the present invention, the exhaust system can be supported by the single structure with the longest span, and the exhaust system can be supported without applying excessive force to the welded portion of the branch pipe. It can be mounted with high support rigidity, and the problem that unreasonable force acts on the exhaust system due to the difference of the vibration system can be solved, and the first stay can be arranged between the collecting case and the cylinder block with good space efficiency. , The whole engine can be made compact.

[Brief description of drawings]

FIG. 1 is a side view of an engine having an exhaust system attached by the device of the present invention, FIG. 2 is a partially cutaway front view of an exhaust manifold, FIG. 3 is a front view of a first stay, and FIG. 4 is a second view. It is a rear view of a stay. (1) …… Engine, (2) …… Exhaust manifold (3) …… Exhaust pipe, (4) …… Exhaust port (5) …… Branch pipe, (7) …… Assembly case (13) …… No. 1 stay, (14) …… 2nd stay

Claims (1)

[Claims] 1. An exhaust system mounting device in a vehicle in which a plurality of exhaust ports are horizontally mounted with the engine facing forward, and a branch pipe made of a plurality of pipes connected to these exhaust ports contains an exhaust catalyst. A cylinder block of the engine, in which an exhaust manifold with a catalytic converter is constructed by welding to the collecting case, and an exhaust pipe connected to the collecting case is extended from the front of the engine to the rear through the lower side thereof. A first stay between the upper front part of the engine and the engine facing surface of the collecting case, the first stay connecting and supporting the collecting case to the cylinder block, and the exhaust pipe connecting the exhaust pipe to the lower rear part of the engine. An exhaust system mounting device for a vehicle, which is supported by a second stay mounted on the vehicle.