JPH0650222A - Reinforcing plate for intake pipe - Google Patents

Abstract

PURPOSE:To let the extended part of a reinforcing plate function as the insulating plate of an EGR pipe so as to avoid troubles due to heat from the EGR pipe by providing the reinforcing plate for reinforcement at installation of an intake pipe, and providing the extended part of the EGR pipe on the reinforcing plate. CONSTITUTION:Each cylinder is provided with an intake pipe 16 to supply intake air and an EGR pipe 28 to let flow back exhaust gas to an intake system. Further, a reinforcing plate 30 for reinforcement at fitting the intake pipe 16 is provided, and this reinforcing plate 30 is provided with an extended part 32 so as to function as a heat insulating plate of the EGR pipe 28. Hereby, troubles due to heat from the EGR pipe 28 can be surely prevented. Further, the life for use of another part arranged in the vicinity of the EGR pipe 28 can be prolonged so as to be profitable in practical use. The reinforcement function at installing the intake pipe 16 and the function as the heat insulating plate of the EGR pipe 28 can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing plate for an intake pipe, and more particularly to a reinforcing plate for an intake pipe that improves the support force of the intake pipe when the intake pipe is mounted on an engine.

[0002]

2. Description of the Related Art In a motorcycle, an outboard motor, or a vehicle engine, cylinders arranged in series,
There are those in which cylinders are arranged facing each other, and a V-type engine in which each cylinder bank is arranged in a V shape.

The V-type engine is constructed by mounting first and second cylinder heads on first and second cylinder banks of a cylinder block. First and second cylinder head covers are attached to the first and second cylinder heads.

A crankshaft extending in the longitudinal direction of the engine is rotatably provided at a substantially central portion of the cylinder block. The crankshaft drives a camshaft of a valve train and auxiliary equipment such as a water pump.

Some engines are equipped with an exhaust gas recirculation (EGR) device that recirculates exhaust gas from the exhaust system to the intake system, guides it again to the cylinder, and recombusts it.

As a reinforcing plate for the intake pipe, an actual flat plate 1-
There is one disclosed in Japanese Patent No. 141360. The intake manifold support structure disclosed in this publication is an intake manifold support structure in which intake branch pipes connected to the respective cylinders of a multi-cylinder engine project laterally from the engine body and collect at the collector. The intake branch pipe near the collector on the front end side, the intake branch pipe near the collector on the rear end side of the engine, and the engine main body side wall are connected to each other by a reinforcing member.

[0007]

By the way, the conventional reinforcing plate for the intake pipe of, for example, a V-type engine is designed to connect the intake pipe and the V-type engine and reinforce the intake pipe so as to improve the supporting force of the intake pipe. Has an aim.

The reinforcing plate is also used to function as a bracket for many parts.

Some of the V-type engines are equipped with an EGR pipe for circulating exhaust gas to the intake system.

However, the EGR pipe becomes hot during the operation of the V-type engine. At this time, when other parts such as an EGR modulator are attached to the V-type engine, E
It may be laid out near the GR pipe.

As a result, the heat-resistant temperature of other parts, for example, the EGR modulator, is about 120 degrees, and there is a possibility that the heat from the EGR pipe may cause a problem, for example, the EGR modulator may be melted and damaged, which is disadvantageous in practical use. There is inconvenience.

[0012]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an engine having an intake pipe for supplying intake air to each cylinder and an EGR pipe for circulating exhaust gas to an intake system. It is characterized in that a reinforcing plate is provided for reinforcing when the intake pipe is attached, and the reinforcing plate is provided with an extension portion so as to function as a heat shield plate for the EGR pipe.

[0013]

According to the invention as described above, when reinforcing the intake pipe when mounting it, one end side of the reinforcing plate is connected to the engine and the other end side is connected to the intake pipe to mount the intake pipe. The supporting force at the time is improved, and at this time, the extension portion of the reinforcing plate functions as a heat shield plate of the EGR pipe, and a defect due to heat from the EGR pipe is avoided.

[0014]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of the present invention. 1 and 2, 2 is an engine, for example, a V-type engine, 4 is a cylinder block, 6-1, 6-
2 is the first and second cylinder banks, 8-1 and 8-2 are the first and second cylinder heads, 10-1 and 10-2 are the first,
The second head cover 12 is an oil pan.

The V-type engine 2 has first and second cylinder banks 6-1 and 6-2 of the cylinder block 4, respectively.
The second cylinder heads 8-1 and 8-2 are placed respectively, and the first and second cylinder heads 8-1 and 8-2 are mounted on the first and second cylinder heads 8-1 and 8-2, respectively.
Head covers 10-1 and 10-2 are attached respectively, and
A bearing cap (not shown) is attached to the lower portion of the cylinder block 4, and an oil pan 12 is attached to the lower portion of the bearing cap.

The crankshaft 14 is rotatably supported by the cylinder block 4 and a bearing cap (not shown) in the front-rear direction of the V-type engine 2.

Further, the V-type engine 2 is constructed to have a total of six cylinders, for example, three cylinders on one side and three cylinders on the other side, and an intake pipe 16 connected to these cylinders is provided.

A throttle valve (not shown) is provided in the throttle body 18, and the collector 20 branches the downstream side of the throttle valve to provide first and second branch passages 22-1 and 22-2. First and second surge tanks 24-1 and 24-2 are connected to the downstream end portions of the first and second branch passages 22-1 and 22-2, respectively.

Further, the first surge tank 24-1 on one side is connected to the cylinder on the other side by first to third intake branch pipes (not shown), and the second surge tank 24-2 on the other side is provided.
Are connected to the one side cylinder by fourth to sixth intake branch pipes (not shown).

The intake pipe 16 is composed of a throttle body 18, a collector 20, and first to sixth intake branch pipes (not shown), and the first and second surge tanks 2 are provided.
4-1 and 24-2 are provided so as to communicate with each other by a communication pipe (not shown).

An intake pipe 26 is provided which connects an air cleaner (not shown) to the throttle body 18 upstream of the collector 20.

Further, an EGR pipe 28 for circulating the exhaust gas of the V-type engine 2 to the intake system is provided, and a reinforcing plate 30 for reinforcing when the intake pipe 16 is attached is provided on the reinforcing plate 30. The extension portion 32 is provided so as to function as a heat shield plate for the pipe 28.

More specifically, as shown in FIGS. 1 and 2, the first cylinder bank 6-1 side of the V-type engine 2 is provided with the first cylinder bank 6-1.
The cylinder head 8-1 and the front side of the V-type engine 2 (see FIG.
EGR pipe 28 is installed on the left side of
The upstream end of the R pipe 28 is connected to an exhaust pipe (not shown), and the downstream end is connected to a predetermined position of the intake pipe 16 so as to be provided.

Further, the intake pipe 16, for example, the collector 2
When attaching 0, one end side is connected to the first cylinder head 8-1 of the V-type engine 2 and the other end side is connected to the collector 2
0 is provided with a reinforcing plate 30 for reinforcement, and the other end of the reinforcing plate 30 has a cross section L extending rightward and downward in FIG. 1 so as to function as a heat shield plate for the EGR pipe 28.
A character-shaped extension portion 32 is provided.

In the vicinity of the first cylinder head 8-1 of the V-type engine 2 and on the front side (left side in FIG. 2) of the V-type engine 2, another component such as an EGR modulator 34 is provided.
Are arranged, and the EGR modulator 34 and the EG
The extension 32 is located between the R pipes 28.

The EGR modulator 34 controls the opening / closing of the EGR valve 36 in accordance with the magnitude of the exhaust gas pressure. For example, when the exhaust gas pressure is high, the EG
The R valve 36 is opened.

Next, the operation will be described.

One end of the reinforcing plate 30 is attached to the V-type engine 2
The first cylinder head 8-1 is connected to the second cylinder head 8-1 and the other end is connected to the collector 20 to improve the support force when mounting the collector 20, that is, to reinforce.

At this time, the EGR modulator 34 and the EG
The extension 32 of the reinforcing plate 30 is located between the R pipes 28, and the heat from the EGR pipe 28 to the EGR modulator 34 side is blocked by the extension 32.

As a result, the EGR pipe 28 to E
It is possible to reliably prevent a defect caused by the heat transmitted to the GR modulator 34 side, for example, melting of the EGR modulator 34 having a heat resistant temperature of about 120 degrees,
It is possible to prolong the service life of the R modulator 34 and reduce the replacement frequency of the EGR modulator 34, which is practically advantageous.

Further, since the reinforcing function at the time of mounting the collector 20 and the function as the heat shield plate of the EGR pipe 28 can be realized by a simple structure in which the extension portion 32 is formed on the reinforcing plate 30, the manufacture is easy. In addition, it is possible to reduce the number of parts as compared with the case where the heat shield plate is newly provided, and the cost can be reduced, which is economically advantageous.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, EGR is used as another component disposed near the EGR pipe.
Although the modulator has been described, a component having a low heat resistant temperature other than the EGR modulator can be used.

[0035]

As described in detail above, according to the present invention, in an engine having an intake pipe for supplying intake air to each cylinder and an EGR pipe for circulating exhaust gas to the intake system, reinforcement at the time of installing the intake pipe Since the reinforcing plate is provided and the extension part is provided on the reinforcing plate so as to function as a heat shield plate for the EGR pipe, it is possible to reliably prevent a defect caused by heat from the EGR pipe, and to dispose near the EGR pipe. It is possible to prolong the service life of other parts to be used, which is practically advantageous. In addition, since the reinforcement function at the time of mounting the intake pipe and the function as the heat shield plate of the EGR pipe can be realized by a simple configuration in which the extension portion is formed in the reinforcement plate,
It is easy to manufacture, and the number of parts can be reduced as compared with the case where the heat shield plate is newly provided, and the cost can be reduced, which is economically advantageous.

[Brief description of drawings]

FIG. 1 is a front view of a V-type engine showing an embodiment of the present invention.

FIG. 2 is a right side view of a V-type engine.

[Explanation of symbols]

 2 V type engine 4 Cylinder block 6-1 1st cylinder bank 6-2 2nd cylinder bank 8-1 1st cylinder head 8-2 2nd cylinder head 10-1 1st head cover 10-2 2nd head cover 16 Intake pipe 18 Throttle body 20 Collector 22-1 1st branch passage 22-2 2nd branch passage 24-1 1st surge tank 24-2 2nd surge tank 26 Intake pipe 28 EGR pipe 30 Reinforcement plate 32 Extension part 34 EGR modulator 36 EGR valve

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[Procedure amendment]

[Submission date] September 22, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

Claims (1)

[Claims] 1. An engine having an intake pipe for supplying intake air to each cylinder and an EGR pipe for circulating exhaust gas to an intake system, and a reinforcing plate for reinforcing the intake pipe when the intake pipe is attached to the engine is provided. Is a reinforcement plate for an intake pipe, which is provided with an extension portion so as to function as a heat shield plate for the EGR pipe.