JPH0681659A - Air intake device v-type engine - Google Patents

Abstract

PURPOSE:To simplify the shape of a surge tank so as to facilitate the manufacture of the surge tank, to reduce the manufacturing cost and to make the assembling work performance of the surge tank desirable, and omit a fitting bolt heretofore used for an opening/closing means for putting a valve body in opening/closing action in order to change the length of a surge tank intake passage so as to improve the assemblage of the opening/closing means besides improving engine performance by changing the length of the intake passage of the surge tank. CONSTITUTION:A surge tank 66 is formed of a lower tank 68 and an upper tank 70. A gasket with opening is interposed between the lower tank 68 and the upper tank 70 to form surge tank intake passages 74, 76 in the surge tank 66. An opening/closing means for opening/closing a valve body 100-6 in order to change the length of the intake passage of the surge tank according to the operating state of an engine is provided downstream of the surge tank intake passage.

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 in particular, a surge tank consisting of a lower tank and an upper tank is attached to an upstream end of an intake manifold whose downstream ends are attached to one side and the other side cylinder heads. The present invention relates to an intake device for a V-type engine.

[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 supported below the cylinder block in cooperation with the cylinder block. Some are configured with a bearing cap attached.

Further, in the V-type engine, in order to install auxiliary machines such as a compressor for an air conditioner and a power steering pump, a bracket for auxiliary machines 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.

Further, as an intake system for a multi-cylinder engine, as disclosed in Japanese Examined Patent Publication No. 3-53454, a multi-cylinder in which an intake expansion chamber and each cylinder are connected by independent independent intake passages for each cylinder. In the intake system of the engine,
A communication unit that branches from the middle of each independent intake passage to communicate each independent intake passage with each other, and a control unit that controls the communication between the independent intake passages by the communication unit according to the operating state of the engine, The intake expansion chamber and the communication chamber are formed by partitioning the tank with a partition wall so that one side of the partition wall of the tank is formed as an intake expansion chamber and the other side is a communication part, and the communication part is provided in parallel with the intake expansion chamber. The volume of the communication part is set to be smaller than the volume of the intake expansion chamber, and each independent intake passage is connected to the intake expansion chamber on the opposite side of the engine body and along the intake expansion chamber and the communication part. The curved part is oriented toward the anti-intake expansion chamber side of the communication part, and the upstream part of each curved independent intake passage uses the part of the constituent walls of the intake expansion chamber and the communication part as the passage forming wall to expand the intake air. Adjacent to the room and communication Had those defined and formed in the Unitanku.

[0006]

By the way, in some conventional V-type engine intake devices, the surge tank is integrally formed of aluminum casting. In such a case, the configuration of the surge tank becomes complicated,
The surge tank is difficult to manufacture, and the manufacturing cost is increased, which is an economical disadvantage.

Further, in the case where the butterfly valve is arranged in the middle of the intake passage, the portion where the butterfly valve is arranged must be formed separately from the other intake passages due to the assembly of the intake system of the V-type engine. did not become.

Therefore, a large number of mounting bolts are required, which may increase the manufacturing cost, which is an economical disadvantage.

[0009]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned inconvenience, the present invention has a surge tank whose downstream end is connected to the upstream end of an intake manifold attached to one side and the other side cylinder heads. In an intake system for a V-type engine, the surge tank is formed by a lower tank and an upper tank, and a gasket is provided between the lower tank and the upper tank. The gasket has a surge tank intake passage of an arbitrary length in the surge tank. An opening is provided to connect the inside of the upper tank and the inside of the lower tank to form the opening. Also, a V having a surge tank whose downstream end is connected to the upstream end of the intake manifold attached to the one side and the other side cylinder heads.
In an intake device for a type engine, the surge tank is formed by a lower tank and an upper tank, and a surge tank intake passage is formed in the surge tank by providing a gasket having an opening between the lower tank and the upper tank. The downstream side portion of the passage is provided with an opening / closing means for performing a closing / opening operation so as to change the length of the surge tank intake passage according to the operating state of the engine.

[0010]

According to the invention as described above, the structure of the surge tank is formed by connecting the inside of the upper tank and the inside of the lower tank by the opening provided in the gasket and forming the surge tank intake passage of any length in the surge tank. Is simplified.

Further, when the V-type engine is driven, the opening / closing means provided at the downstream side portion of the surge tank intake passage is opened / closed depending on the engine operating condition to change the length of the surge tank intake passage. .

[0012]

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

1 to 5 show an embodiment of the present invention. In FIG. 1, 2 is a V-type engine and 4 is a cylinder block. The V-type engine 2 includes a V-shaped primary side above the cylinder block 4, a primary side of the secondary side cylinder banks 6 and 8, and a secondary side cylinder heads 10 and 12.
Primary side and secondary side engine banks 1 configured by mounting
It has four and sixteen.

A bearing cap 18 is connected to the lower portion of the cylinder block 4, and the bearing cap 1
An oil pan (not shown) is attached to the lower part of 8.

A crankshaft 20 is supported between the lower portion of the cylinder block 4 and the upper portion of the bearing cap 18.

A primary side cylinder 22 is formed in the primary side cylinder bank 6, and a primary side piston (not shown) is provided in the primary side cylinder 22 so as to reciprocate. The primary side piston (not shown) is connected to the crankshaft 20 via a primary side connecting rod (not shown).

A primary combustion chamber 24 is formed by the primary cylinder head 10, the primary piston (not shown) and the primary cylinder 22.

The primary cylinder head 10 has a primary intake port 26 communicating with the primary combustion chamber 24. A primary intake passage 30 formed by a primary intake manifold 28 is connected to the primary intake port 26. Further, the primary intake port 26A of the primary intake port 26 is opened and closed by a primary intake valve 32.

Further, the primary side cylinder head 10 is formed with a primary side exhaust port 34 communicating with the primary side combustion chamber 24. A primary side exhaust passage (not shown) formed by a primary side exhaust manifold (not shown) communicates with the primary side exhaust port 34. The primary side exhaust port 34
The primary side exhaust port 34A is opened and closed by a primary side exhaust valve 36.

Similarly, a secondary side cylinder 38 is formed in the secondary side cylinder bank 8, and a secondary side piston (not shown) is reciprocally provided in the secondary side cylinder 38. The secondary side piston (not shown) is connected to the crankshaft 20 via a secondary side connecting rod (not shown).

A secondary combustion chamber 40 is formed by the secondary cylinder head 12, the secondary piston (not shown) and the secondary cylinder 38.

The secondary side cylinder head 12 has a secondary side intake port 42 communicating with the secondary side combustion chamber 40. A secondary intake passage 46 formed by a secondary intake manifold 44 is connected to the secondary intake port 42. Further, the secondary intake port 42A of the secondary intake port 42 is opened and closed by a secondary intake valve 48.

Further, the secondary side cylinder head 12 is formed with a secondary side exhaust port 50 communicating with the secondary side combustion chamber 40. The secondary side exhaust port 50 communicates with a secondary side exhaust passage (not shown) formed of a secondary side exhaust manifold (not shown). The secondary exhaust port 50A of the secondary exhaust port 50 is opened and closed by a secondary exhaust valve 52.

Further, on the primary engine bank 14 side, the primary side suction head is installed above the primary cylinder head 10.
Primary-side intake / exhaust camshaft 5 for operating the exhaust valves 32, 36
4, 56 are arranged side by side, and the secondary side intake / exhaust valves for operating the secondary side intake / exhaust valves 48, 52 are provided above the secondary side cylinder head 12 on the secondary engine bank 16 side. The cam shafts 58 and 60 are juxtaposed.

Furthermore, a primary side cylinder head cover 62 is attached to the upper part of the primary side cylinder head 10, and a secondary side cylinder head cover 64 is attached to the upper part of the secondary side cylinder head 12.

Therefore, in the V-type engine 2, the primary side engine bank 14 and the secondary side engine bank 16 are constructed substantially symmetrically with respect to the crankshaft center line of the crankshaft 20.

Further, the surge tank 66 is formed by a lower tank 68 and an upper tank 70, and a gasket 72 is provided between the lower tank 68 and the upper tank 70. First to third openings 78, 80 and 82 are provided to connect the inside of the upper tank 70 and the inside of the lower tank 68 to form the first and second surge tank intake passages 74 and 76 having the lengths of.

More specifically, a first mounting portion 84 is provided in which the upstream end portions of the primary side and secondary side intake manifolds 28, 44 are alternately connected at a substantially central portion above the V-type engine 2. The second attachment portion 86 provided on the lower surface of the lower tank 68 of the surge tank 66 is attached to the first attachment portion 84.
As shown in FIG. 1, the second mounting portion 86 is formed on one side (right side in FIG. 1) of the central portion.

Further, the lower tank 68 has a recess 90 for the intake collecting portion 88 and six surge tank intake passage grooves 92-1 to 92-6 formed on one side (right side in FIG. 3). There is.

Further, in the gasket 72, one first opening 78 for the intake collecting portion 88 and six second opening 80 for the second surge tank intake passage 76 for high speed operation are provided.
A third opening 82 for the first surge tank intake passage 74 for low speed operation is provided.

The first surge tank intake passage 74 for low speed operation includes the upper tank side passage 94 and the lower tank side passage 9.
6 and is formed in a large length, and has a gasket 72
The intake collecting portion 88 is connected to the primary and secondary intake manifolds 28, 44 via a downstream opening 96A of a lower tank side passage 96 formed by the lower surface and the lower tank 68.

The second surge tank intake passage 76 for high-speed operation is composed of a part of the upstream side of the upper tank side passage 94 and a part of the downstream side of the lower tank side passage 96, and is formed to have a small length. The second opening 80 of the gasket 72
The intake collecting portion 88 is connected to the primary and secondary intake manifolds 28 and 44 via the.

Further, the surge tank 66 is replaced with the lower tank 68.
And the upper tank 70, and a gasket 72 having first to third openings 78, 80, 82 is provided between the lower tank 68 and the upper tank 70, and the first and second gaskets are provided in the surge tank 66. The surge tank intake passages 74 and 76 are formed, and the first and second surge tank intake passages 74 and 76 are provided at the downstream side portions of the first and second surge tank intake passages 74 and 76 depending on the operating condition of the engine.
An opening / closing means 98 for opening and closing is provided to select either one and change the length of the surge tank intake passage.

More specifically, the lower tank side passage 9 which is a downstream side portion of the first and second surge tank intake passages 74 and 76.
6 Opening / closing means 98 is provided on the lower tank 68 side at the downstream side portion. The opening / closing means 98 includes first to sixth valve bodies 100-1 to 100-1.
It is configured by 100-6, the shaft body 102, and the drive unit 104.

The drive unit 104 opens and closes the first to sixth valve bodies 100-1 to 100-6 via the shaft body 102 according to the operating state of the V-type engine 2, for example, the intake pipe pressure. is there.

The first to sixth valve bodies 100-1 to 100-
Reference numeral 6 is for opening and closing by the drive unit 104 to select either one of the first and second surge tank intake passages 74 and 76.

Next, the operation will be described.

A gasket 72 is interposed between the lower tank 68 and the upper tank 70 of the surge tank 66, and the first to third openings 78, 80, 8 provided in the gasket 72 are provided.
2 connects the inside of the upper tank 70 and the inside of the lower tank 68 with each other, and the surge tank 66 has a first and a second of arbitrary length.
The surge tank intake passages 74 and 76 are formed.

Further, when the V-type engine 2 is operated at a low speed, as shown in FIG. 5, the drive unit 1 which constitutes the opening / closing means 98.
04 operates the first to sixth valve bodies 100-1 to 100-6, closes the second opening 80 of the gasket 72 to close the second surge tank intake passage 76, and has a large length of the first opening 80. The downstream opening 96A is opened to open the first surge tank intake passage 74.

Further, when the V-type engine 2 operates at high speed, as shown in FIG. 4, the drive unit 1 which constitutes the opening / closing means 98.
04 operates the first to sixth valve bodies 100-1 to 100-6 to close the downstream opening 96A so as to close the first surge tank intake passage 74, and the second surge tank intake of a small length. The second opening 80 of the gasket 72 is opened to open the passage 76.

As a result, the gasket 7 provided between the lower tank 68 and the upper tank 70 of the surge tank 66 is provided.
By providing the first to third openings 78, 80, 82 in the second tank 2, the first and second surge tank intake passages 74, 76 can be formed in the surge tank 66.
6 can be easily manufactured, the manufacturing cost can be reduced, which is economically advantageous and the workability of assembling the surge tank 66 can be improved.

Further, in order to form the first and second surge tank intake passages 74 and 76 of arbitrary length in the surge tank 66, the first to the first to connect the gasket 72 to the upper tank 70 and the lower tank 68 to form the gasket 72. 3 openings 78, 80, 8
By providing 2, the shape of the surge tank 66 can be simplified, and the weight of the surge tank 66 can be reduced, which is practically advantageous.

Further, by disposing the opening / closing means 98 on the lower tank 68 side, the mounting bolt (not shown) for the opening / closing means which has been conventionally used can be omitted, and the assembling property of the opening / closing means can be improved. In addition to being practically advantageous, the manufacturing cost can be reduced, which is economically advantageous.

Furthermore, the opening / closing means 98 is connected to the lower tank 68.
The second opening 80 and the downstream opening 96 of the gasket 72 are disposed depending on the operating state of the V-type engine 2 by being disposed on the side.
By opening and closing A, the first and second surge tank intake passages 74,
The length of 76 can be changed, and the engine performance of the V-type engine 2 can be improved, which is practically advantageous.

[0045]

As described in detail above, according to the present invention, the surge tank is formed by the lower tank and the upper tank, and the gasket is provided between the lower tank and the upper tank. The gasket has an arbitrary length in the surge tank. Since the opening for connecting the inside of the upper tank and the inside of the lower tank is provided to form the surge tank intake passage, the surge tank can be manufactured easily, the manufacturing cost can be reduced, and it is economically advantageous. In addition, the workability of assembling the surge tank can be improved. The shape of the surge tank can be simplified by providing the gasket with an opening that connects the inside of the upper tank and the inside of the lower tank in order to form the surge tank intake passages of different lengths inside the surge tank. Can be done,
It is practically advantageous. Further, the surge tank is formed by a lower tank and an upper tank, and a gasket having an opening is provided between the lower tank and the upper tank to form a surge tank intake passage in the surge tank. Since the opening and closing means that closes and opens to change the length of the surge tank intake passage is provided according to the operating condition of the engine, the mounting bolts for the opening and closing means that were used in the past can be omitted and the assembling ability of the opening and closing means is improved. In addition to being practically advantageous, the manufacturing cost can be reduced, which is economically advantageous. Further, by disposing the opening / closing means, the length of the surge tank intake passage can be changed according to the operating state of the engine, and the engine performance can be improved, which is practically advantageous.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a surge tank.

FIG. 3 is a plan view of a lower tank of a surge tank.

FIG. 4 is an explanatory diagram of an operating state of the surge tank.

FIG. 5 is an explanatory diagram of an operating state of the surge tank.

[Explanation of symbols]

 2 V type engine 10 primary side cylinder head 12 secondary side cylinder head 62 primary side cylinder head cover 64 secondary side cylinder head cover 66 surge tank 68 lower tank 70 upper tank 72 gasket 74 first surge tank intake passage 76 second surge tank intake passage 78 1st opening part 80 2nd opening part 82 3rd opening part 84 1st mounting part 86 2nd mounting part 88 Air intake gathering part 90 Recessed part 92 Surge tank intake passage groove part 94 Upper tank side passage 96 Lower tank side passage 98 Opening / closing means 100 Valve Body 102 Shaft 104 Drive unit

Claims (2)

[Claims] 1. An intake system for a V-type engine having a surge tank whose downstream end is connected to the upstream end of an intake manifold attached to one and the other cylinder heads.
The surge tank is formed by a lower tank and an upper tank, and a gasket is provided between the lower tank and the upper tank, and in this gasket, the surge tank intake passage of any length is formed in the surge tank and the upper tank. An intake device for a V-type engine, which is provided with an opening communicating with the inside of the lower tank. 2. An intake system for a V-type engine having a surge tank having a downstream end connected to an upstream end of an intake manifold attached to one and the other cylinder heads.
The surge tank is formed of a lower tank and an upper tank, and a gasket having an opening is provided between the lower tank and the upper tank to form a surge tank intake passage in the surge tank. An intake device for a V-type engine, which is provided with an opening / closing means for performing a closing / opening operation in order to change a length of a surge tank intake passage according to an operating state of the engine.