JPH06317227A - Air intake device for v-type engine - Google Patents

Abstract

PURPOSE:To lower a bonnet hood line of a vehicle by reducing the total height of a V-type engine, keeping a passage cross-sectional area of a connecting pipe constant, utilize a resonance effect to the maximum extent when the first and the second surge tanks are connected to each other by the connecting pipe, and eliminate the possibility of deteriorating engine performance. CONSTITUTION:In midway of an intake air passage downstream from a throttle valve of an intake device of a V type engine is branched off by a branch pipe, an the first and the second branch passages are arranged, and one end side of the first and the second surge tanks are connected respectively to the downstream end parts of these first and second branch passage, and a connecting pipe 26 is arranged to connect these first and the second surge tanks to each other, and an intake air pipe 28 connected to a throttle body upstream of the branch pipe is arranged under the connecting pipe 26 so as to cross each other, and the recessed part 30 is formed in the upper part of the intake air pipe 28 in the crossing part, and a passage width of the connecting pipe 26 in the crossing part is made large, and a passage height is made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for a V-type engine, and more particularly to mounting first and second cylinder heads on first and second cylinder banks of a cylinder block, respectively. The first and second head covers are respectively placed on the two cylinder heads to form a V-shape.
The present invention relates to an intake device for a V-type engine in which first and second surge tanks are arranged above a second cylinder bank.

[0002]

2. Description of the Related Art As an engine of a vehicle, there are an engine having cylinders arranged in series, an engine having cylinders opposed to each other, and a V-type engine having cylinder banks arranged in a V shape.

In this V-type engine, first and second cylinder heads are mounted on first and second cylinder banks of a cylinder block, respectively, and a crankshaft is provided below the cylinder block in cooperation with the cylinder block. Some are configured with a bearing cap to support them.

In addition, in the V-type engine, in order to install an auxiliary machine such as a compressor for an air conditioner or a power steering pump, an auxiliary machine bracket is attached as a mounting bracket to the cylinder block, or the engine is mounted on the vehicle body. A mounting bracket to support it is attached.

An air intake device for the V-type engine is disclosed in Japanese Utility Model Laid-Open No. 20723/1990. The intake system for a V-type 8-cylinder engine disclosed in this publication is provided with a pair of sub-collectors above each of the two banks of the V-type 8-cylinder engine, and intake air is introduced between the two banks and a pair of sub-collectors are provided. While the main collector connected to the sub-collector is provided, the eight cylinders are divided into two cylinder groups that do not interfere with each other in intake air, and the two cylinders in each of the two cylinder groups are located at the front and rear end positions of both banks, and the other two cylinder groups. The cylinders are arranged at intermediate positions at the front and rear ends of the bank on the opposite side of the bank where the two cylinders are located respectively, and the intake pipes connected to the cylinders located at the front and rear ends of the bank are provided above the bank on the opposite side of the bank. Intake pipes connected to the cylinders located in the middle of the front and rear ends of the bank are connected to the subcollectors, respectively, to the subcollectors provided above the bank.

[0006]

By the way, in the conventional intake system for a V-type engine, there are a total of 6 cylinders of the V-type engine having the same number on both sides, for example, three on one side and three on the other side. And the intake passage is connected to these cylinders.

Then, a throttle valve is provided in the throttle body in the middle of the intake passage, and a downstream side of the throttle valve is branched by a branch pipe to provide first and second branch passages. First and second surge tanks are connected to the downstream end portions of the branch passages, respectively.

Further, the first surge tank is connected to each of the three cylinders on one side by, for example, three first to third intake pipes, and the second surge tank is provided with three fourth to fourth cylinders. Six intake pipes are connected to each of the three cylinders on the other side.

Further, the first and second surge tanks are connected by a connecting pipe to cause a resonance effect and secure a high torque. At this time, an intake pipe connecting the air cleaner to the throttle body is arranged so as to intersect the lower part of the connecting pipe.

As a result, in the layout of the V-type engine, the intake pipe is located above the V-type engine, and the connecting pipe connecting the first and second surge tanks is arranged above the intake pipe. However, the overall height of the V-type engine becomes large, and the hood hood line becomes high, which is disadvantageous in practical use.

[0011]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a first cylinder block,
The first and second cylinder heads are mounted on the second cylinder bank, and the first and second head covers are mounted on the first and second cylinder heads, respectively.
In an intake system for a type engine, a first and a second branch passages are provided by branching a midway of the intake passage downstream of a throttle valve with a branch pipe, and first and second branch passages are provided with a first end and a second end, respectively. The first and second surge tanks are connected to one end side thereof, and a connecting pipe for connecting these first and second surge tanks is provided, and an intake pipe connecting to the throttle body upstream of the branch pipe is provided below the connecting pipe. It is characterized in that they are arranged so as to intersect with each other, a recess is formed in the upper portion of the intake pipe at this intersection, and the passage width of the connecting pipe at the intersection is large and the passage height is small.

[0012]

According to the invention as described above, when laying out a V-type engine, a connecting pipe having a large passage width and a small passage height is crossed in a concave portion in the upper portion of the intake pipe communicating with the throttle body, so that the V-shaped engine is crossed. The overall height of the engine is small and the bonnet hood line is low.

[0013]

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

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

That is, in the V-type engine 2, the first and second cylinder heads 8-1 and 8-2 are mounted on the first and second cylinder banks 6-1 and 6-2 of the cylinder block 4, respectively.
The first and second cylinder heads 8-1 and 8-2 are provided with
The second head covers 10-1 and 10-2 are respectively provided, 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 S 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, as shown in FIG. 4, 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 passage 14 communicating with these cylinders.
To provide.

Then, a throttle valve (not shown) is provided in the throttle body 16, and the downstream side of the throttle valve is branched by a branch pipe 18 to divide the first and second throttle valves.
The branch passages 20-1 and 20-2 are provided, and these first and second passages are provided.
At the downstream side end portions of the branch passages 20-1 and 20-2, the first,
One end side of the second surge tanks 22-1 and 22-2 is connected and provided.

The first surge tank 22-1 on one side is connected to the three cylinders on one side by the first to third intake pipes 24-1 to 24-3, and the second surge tank on the other side is provided. The surge tank 22-2 is connected to the three cylinders on the other side by the fourth to sixth intake pipes 24-4 to 24-6.

The intake passage 14 is connected to the throttle body 16, the branch pipe 18, the first to sixth intake pipes 24-
1 to 24-6, and the first and second surge tanks 22-1 and 22-2 are provided so as to communicate with each other by a communication pipe 26.

An intake pipe 28 which communicates with the throttle body 16 on the upstream side of the branch pipe 18 is arranged so as to intersect with the lower portion of the communication pipe 26, and a recess 30 is formed in the upper portion of the intake pipe 28 at this intersection, and the intersection 30 is formed. The passage width W of the connecting pipe 26 at the portion is made large and the passage height H is made small.

More specifically, as shown in FIG. 2, in the layout of the V-type engine 2, an intake pipe 28 is arranged so as to communicate with the throttle body 16 above the V-type engine 2, and is more than the intake pipe 28. A connecting pipe 26 that connects the first and second surge tanks 22-1 and 22-2 is arranged to intersect with the upper portion.

At this time, as shown in FIGS. 1, 7, and 8, a recess 30 is formed in the upper portion of the intake pipe 28 at the intersection of the connecting pipe 26 and the intake pipe 28.

At the intersection of the connecting pipe 26 and the intake pipe 28, the passage width W of the connecting pipe 26 is increased as shown in FIGS. 1 and 5, and as shown in FIGS. 1 and 6. The passage height H of the connecting pipe 26 is made small.

Then, as shown in FIG. 1, at the intersection of the connecting pipe 26 and the intake pipe 28, the connecting pipe 26 is positioned in the recess 30 in the upper portion of the intake pipe 28, and the V-shaped engine 2 when laying out the V-shaped engine 2 is arranged. The overall height of the engine 2 is small.

Reference numeral 32 is an air cleaner, and 34 is a vehicle hood line (not shown).

Next, the operation will be described.

When laying out the V-type engine 2,
First, the throttle body 16 and the air cleaner 32 are connected by the intake pipe 28, and the recess 3 at the upper part of the intake pipe 28 is connected.
The connecting pipe 26 is located in the position 0.

At this time, the connecting pipe 26 is the intake pipe 28.
It is formed so that the passage width W is large and the passage height H is small at the intersection portion with, for example, the central portion, and the passage width W is small and the passage height H is large at both end portions. The cross-sectional area of the passage of the connecting pipe 26 is ensured to be constant.

As a result, the overall height of the V-type engine 2 can be made smaller than in the conventional case, and the hood hood line 34 of a vehicle (not shown) can be lowered, which is practically advantageous.

Further, in the formation of the connecting pipe 26, the passage width W is made large and the passage height H is made small at the central portion which intersects with the intake pipe 28.
The passage cross-sectional area of the communication pipe 26 can be made constant without decreasing, and the first and second surge tanks 22-1 and 22-2
It is possible to maximize the use of the resonance effect when -2 is connected by the connecting pipe 26, and to secure high torque.

Further, when the connecting pipe 26 is formed, the height H of the passage is made small so that the amount of depression of the recess 30 of the intake pipe 28 can be kept to a minimum. A similar amount of intake air can be secured, and there is no fear of lowering the engine performance of the V-type engine.

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, when the passage width of the connecting pipe is formed large and the passage height of the connecting pipe is formed small, the connecting pipe is simply formed in a flat shape. The passage width of the connecting pipe is further increased, and a recessed portion that matches the recess of the upper portion of the intake pipe is formed in the lower part of the connecting pipe to reduce the connecting pipe passage height without changing the connecting pipe passage cross-sectional area. It is also possible to further reduce the overall height of the V-type engine when laying out the V-type engine.

[0035]

As described above in detail, according to the present invention, the first part of the intake passage of the V-type engine is branched by the branch pipe in the middle of the intake passage downstream of the throttle valve.
A second branch passage is provided, one end side of each of the first and second surge tanks is connected to the downstream end of each of the first and second branch passages, and the first and second surge tanks are connected to each other. A pipe is provided, and the intake pipe that connects to the throttle body on the upstream side of the branch pipe is arranged so as to intersect with the lower part of the communication pipe. In addition, since the passage height is made small, the total height of the V-type engine can be made smaller than that of the conventional one, and the vehicle hood hood line can be made low, which is practically advantageous. Further, in the formation of the connecting pipe, by forming the passage width at the intersection with the intake pipe to be large and the passage height to be small, it is possible to make the passage sectional area of the connecting pipe constant. It is possible to maximize the use of the resonance effect when connecting the first and second surge tanks through the connecting pipe, and to secure high torque. Furthermore, when the connecting pipe is formed, the height of the passage is formed to be small, so that the recessed amount of the recess of the intake pipe can be kept to a minimum, and the engine performance of the V-type engine is deteriorated. There is no fear of it.

[Brief description of drawings]

FIG. 1 is a schematic enlarged explanatory view of a crossing portion of a connecting pipe and an intake pipe showing an embodiment of the present invention.

FIG. 2 is a plan view of a V-type engine.

FIG. 3 is a front view of a V-type engine.

FIG. 4 is a right side view of a V-type engine.

FIG. 5 is an enlarged plan view of a connecting pipe.

FIG. 6 is an enlarged front view of a connecting pipe.

FIG. 7 is an enlarged plan view of a main part of an intake pipe.

FIG. 8 is an enlarged front view of a main part of an intake pipe.

[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 12 Oil pan S crankshaft 14 intake passage 16 throttle body 18 branch pipe 20-2 second branch passage 22-1 first surge tank 22-2 second surge tank 24-1 to 24-6 first intake pipe to sixth intake pipe 26 Connecting pipe 28 Intake pipe 30 Recess 32 Air cleaner 34 Bonnet hood line

Front page continued (72) Inventor Michihiro Kato 300 Takatsuka-cho, Hamamatsu City, Shizuoka Prefecture Suzuki Stock Company

Claims (1)

[Claims] 1. A first and a second cylinder head are mounted on the first and second cylinder banks of a cylinder block, and a first and a second head cover are respectively mounted on these first and second cylinder heads. In a V-shaped engine intake device formed in a V shape, first and second branch passages are provided by branching a midway of the intake passage downstream of a throttle valve with a branch pipe, and downstream of these first and second branch passages. The one end sides of the first and second surge tanks are connected to the side end portions, respectively, and the connecting pipes for connecting these first and second surge tanks are provided,
An intake pipe that communicates with the throttle body on the upstream side of the branch pipe is arranged so as to intersect below the communication pipe, and a recess is formed in the upper portion of the intake pipe at this intersection, and the passage width of the communication pipe at the intersection is increased. The intake system for a V-type engine is characterized in that the passage height is small.