JPH051562A - Reinforcing structure of v-type engine - Google Patents

Abstract

PURPOSE:To improve the extent of torsional rigidity in a cylinder block without narrowing an interspace between two banks, as promoting a reduction in intake air resistance, by setting up an intercooler so properly, in a V-type engine. CONSTITUTION:This reinforcing structure has a pair of branks Bf, Br being symmetrically opposed with each other, and it is provided with two surge tanks 14f, 14r in response to both these banks Bf, Br. In addition, two intercoolers 30, 32 are set up in the upper part of these surge tanks 14F, 14r of both these banks Bf, Br, and these surge tanks 14f, 14r are connected each to a lower part at the side corresponding to each of the banks Bf, Br of these intercoolers 30, 31, installing a pedestal 26 on which these interloolers 30, 31 are set up, then this pedestal 26 is locked to each of cylinder heads 3f, 3r of both these banks Bf, Br.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine reinforcing structure, and more particularly to a V type engine reinforcing structure having an intercooler.

[0002]

2. Description of the Related Art Generally, in a V-type engine having a pair of left and right banks, since the left and right banks are separated from each other, it is difficult to increase the torsional rigidity of the cylinder block. There is a problem that bending vibration of a so-called power plant including a transmission connected to an engine, that is, a resonance frequency range of power plant bending becomes a low frequency range, and a muffled sound is generated due to resonance of the power plant at a normal engine speed. is there.
Therefore, as a measure for increasing the torsional rigidity of the cylinder block, it has been conventionally practiced to fasten both left and right banks. For example, Japanese Patent Publication No. 57-32745 discloses an exhaust gas between both banks of a V-type engine. It is known that a manifold assembly is provided, and the exhaust manifold assembly is fixed to the cylinder block side walls of each of the left and right banks to fasten the two banks.

[0003]

However, in the one described in the above publication, since a member for fastening both banks is provided between the two banks, the space between the two banks cannot be used for other purposes. For example, when a mechanical supercharger is provided, it is not possible to arrange the mechanical supercharger between both banks to make the engine compact.

On the other hand, in the case where the engine is provided with an intercooler, if the intercooler is arranged in front of or on the side of the engine, the intake passage passing through the intercooler becomes long, and the intake resistance increases and the response deteriorates. Therefore, there is a demand to place the intercooler as close to the engine as possible. In particular, in the V-type engine, since the intake passage is connected to the cylinders of both the left and right banks, the intake passage is likely to be long, and the above requirement is strong.

The present invention has been made in view of the above circumstances, and an object of the present invention is to appropriately dispose an intercooler in a V-type engine so as to reduce intake resistance and to reduce a difference between both banks. It is to improve the torsional rigidity of the cylinder block without narrowing the space.

[0006]

In order to achieve the above-mentioned object, the solution means provided by the invention of claim 1 has a pair of banks facing left and right, and a surge tank is provided corresponding to each of the banks. The target is the equipped V-type engine. An intercooler is installed above the surge tanks of both banks, each surge tank is connected to a lower portion of a side portion corresponding to each bank of the intercooler, and a pedestal for installing the intercooler is provided, The pedestal is fixed to each cylinder head portion of both banks.

According to a second aspect of the present invention, in the first aspect of the present invention, a mechanical supercharger driven by an engine output shaft is provided between both banks, and the intake and discharge ports of the mechanical supercharger are provided in the intercooler. It is arranged close to the intake air inlet.

[0008]

With the above structure, in the invention of claim 1, since the pedestal of the intercooler is fixed to each cylinder head portion of both banks, the upper portions of both banks are fastened by the pedestal, A closed cross section is formed between both banks via the pedestal. Therefore, the bank part of the cylinder block also has a closed cross-sectional structure without narrowing the space between both banks, and the torsional rigidity of the cylinder block is improved, and the torsional bending resonance of the power plant bending caused by the torsional rigidity of the cylinder block. The frequency is shifted to the high frequency side, and muffled noise due to resonance of the power plant in the engine normal rotation speed range is prevented from being generated.

Further, since the surge tanks of each bank are respectively connected to the lower parts of the left and right banks of the intercooler, the intake passage on the downstream side of the intercooler can be efficiently shortened, and the intake resistance can be reduced.

According to the second aspect of the invention, when the mechanical supercharger is provided, the intake passage length to the intercooler connected to the downstream side of the mechanical supercharger can be shortened, and the mechanical supercharger can be shortened. Intake resistance in the intake passage on the downstream side of the machine is reduced.

[0011]

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

1 and 2 show a first embodiment of the present invention. In these figures, 1 is a V-type 6-cylinder engine having a pair of left and right banks Bf and Br. The engine 1 is mounted on a cylinder block 2 having a substantially V-shaped cross section and on the upper surface of the cylinder block 2. And a pair of left and right cylinder heads 3f, 3r and each cylinder head 3f, 3r
cylinder head cover 4f mounted on the upper surface of r,
4r, and an oil pan (not shown) assembled on the lower surface of the cylinder block 2. 6 is the engine 1
Is a Risholum type supercharger as a mechanical supercharger arranged in the cylinder row direction between the left and right banks Bf and Br forming the V bank. This supercharger 6
Is driven at all times by a driving force transmitted from a crank pulley 8a mounted on a crank shaft 8 to a pulley 7a connected to a driving shaft arranged on the front side (downward in FIG. 2) of the engine 1 via a belt 9. It has become so.

An intake inlet 6b for introducing intake air is provided at the rear end of the supercharger 6, and an intake passage 10 on the upstream side is connected to the intake inlet 6b via a throttle body 11. . An intake air discharge portion 6c is provided on the right side of the central portion of the supercharger 6, and the intake air pressurized by the supercharger 6 is discharged to the intake air discharge portion 6c. The intake / discharge section 6c
Is provided with a sound absorbing material along the inner wall thereof, and is provided with an intake / exhaust port 6d that opens toward the front side. The intake / exhaust port 6d is provided on the left and right intercoolers 30 above the engine 1. , 31 of the intake air inlets 30a, 31a are connected to each other by the intake passage 10 branched in two directions.

Further, each of the above intercoolers 30, 31
Are water-cooled, and are installed on the pedestal 26 so as to be adjacent to each other on the left and right sides. The pedestal 26 is provided with four mounting stays 32a to 32d provided on the lower surface thereof, and four bosses 26a to 26d at the front and rear ends of the cylinder heads 3f and 3r of the banks Bf and Br on the bank side upper ends.
Respectively, and is installed above the banks Bf and Br. Therefore, the above intercoolers 30, 31
Is arranged above the banks Bf and Br and bridges between the banks Bf and Br. The pedestal 26 is formed to have a high rigidity, and the cylinder heads 3f and 3r, the bank side wall surface of the cylinder block 2 and the lower deck form a closed cross section between the banks Bf and Br. There is.

Further, each of the above intercoolers 30, 31
Are configured such that the intake air flows from both sides of the center of the bank to both sides of the bank and is cooled. , 31b are intake ports 30c, 31c for discharging cooled intake air to the lower portions on both sides of the bank.
Are provided respectively. Each of the intake / exhaust ports 30c,
31c includes surge tanks 14 of both banks Bf and Br.
The upstream ends of f and 14r are connected to each other. The surge tanks 14f and 14r extend in the cylinder row direction, and the cylinder head covers 3f and 3f of the left and right banks Bf and Br, respectively.
They are arranged above 3r and below the left and right ends of the intercooler 13, respectively. From the surge tanks 14f, 14r, the intake pipes 15, 15,
Reference numeral 15 is connected so as to communicate with the intake port 16 of each cylinder 5 formed in each bank Bf, Br. Also,
The front ends of the surge tanks 14f and 14r are communicated with each other by a communication passage 17, and supercharging of intake air is performed by a resonance effect in which the upstream intake passages 10 of the surge tanks 14f and 14r serve as resonance spaces. The resonance tuning rotation speed at this time is set to shift to the high rotation side.

With the above structure, in the above embodiment, the pedestal 26 of the intercooler formed in the upper portion of the banks Bf and Br with high rigidity is provided with the cylinder heads 3f and 3f.
Since the closed cross section is formed between the banks Bf and Br by r, the wall surface on the bank side of the cylinder block 2 and the lower deck, the space between the banks Bf and Br is not narrowed, and the bank of the cylinder block 2 is The formed portion also has a closed cross-section structure, and the torsional rigidity of the cylinder block 2 can be improved. Therefore, the resonance frequency of the torsion bending of the power plant bending caused by the torsional rigidity of the cylinder block 2 can be shifted to the high frequency side, and the generation of muffled noise due to the resonance of the power plant in the engine normal rotation speed range can be prevented. You can

The intake port 6d of the supercharger 6 arranged between the banks Bf and Br is open toward the front side, and the intercoolers 30 and 31 are arranged directly above the supercharger 6. Since the intake inlets 30a and 31a are provided on the front side and in the center of the bank, the intake passage 10 between the supercharger 6 and the intercoolers 30 and 31 on the downstream side is shortened. be able to. Further, since the surge tanks 14f and 14r are directly connected to the intake air discharge ports 30a and 31a of the intercoolers 30 and 31, respectively, the intake passages on the downstream side of the intercoolers 30 and 31 are shortest. You can Therefore, the intake passage 10 on the downstream side of the supercharger 6 can be shortened as a whole, the intake resistance can be reduced, and the response of the engine 1 can be improved. In particular, the response of the engine 1 can be effectively improved in the supercharging operation region by the supercharger 6 that requires improved response.

The surge tanks 14f and 14r are
Since they are directly connected to the intake and discharge ports 30a and 31a of the intercoolers 30 and 31 installed on the pedestal 26 fixed to the cylinder heads 3f and 3r, they are supported by the cylinder heads 3f and 3r. There is no need to do this, and the assembly can be facilitated.

3 and 4 show a second embodiment of the present invention. The same parts as those of FIGS. 1 and 2 of the first embodiment described above are designated by the same reference numerals and detailed description thereof will be omitted. In these figures, 100 is a pair of banks Bf, B facing left and right.
A V-type 6-cylinder engine having r, where 6 is the engine 1
Is a Risholum type supercharger as a mechanical supercharger arranged in the cylinder row direction between the left and right banks Bf and Br forming the V bank. This supercharger 6
Is coupled to a drive shaft 6a arranged on the front side of the engine 1 (downward in FIG. 4), and is mounted on a crankshaft 8 to a pulley 7a mounted on a shaft portion of the coupling 7. The driving force is transmitted from the crank pulley 8a through the belt 9 so that the crank pulley 8a is constantly driven to rotate.

An intake inlet 6b for introducing intake air is provided at the rear end of the supercharger 6, and an intake passage 10 on the upstream side is connected to the intake inlet 6b through a throttle body 11. . The throttle body 1
Throttle valve 1 for adjusting the intake flow rate in the passage in 1
2 are provided. Also, the above supercharger 6
An intake air discharge portion 6c is provided on the right side of the center of the intake air, and the intake air pressurized by the supercharger 6 is discharged to the intake air discharge portion 6c. The intake / exhaust portion 6c is provided with a sound absorbing material along the inner wall thereof, and is provided with an intake / exhaust opening 6d which is open toward the front side.
d is an intercooler 13 arranged above the engine 1.
The intake air inlet 13a and the intake air passage 10 are connected to each other.

The intercooler 13 is of a water cooling type and is installed on the pedestal 26. The pedestal 26 is
Four bosses 26a at the front and rear ends of the upper ends of the cylinder heads 3f and 3r of the banks Bf and Br on the bank side.
It is fixed to 26d and is installed above the banks Bf and Br. That is, the intercooler 13 is arranged above the banks Bf and Br and bridges between the banks Bf and Br. The pedestal 26 is formed to have a high rigidity, and the cylinder heads 3f and 3r, the bank side wall surface of the cylinder block 2 and the lower deck form a closed cross section between the banks Bf and Br. There is. The intercooler 13 has the intake air inlet 13a at a position corresponding to the intake air discharge port 6d of the supercharger 6 in the left-right direction at the lower front side, and cools the intake air at the central portion above the main body of the supercharger 6. The core portion 13c is provided with intake air discharge ports 13b for discharging the cooled intake air to the rear side, respectively. A downstream side intake passage 10 is connected to the intake / exhaust port 13b, and the downstream side intake passage 10 is branched left and right and connected to the upstream ends of the surge tanks 14f and 14r of the left and right banks Bf and Br, respectively. ing. Each surge tank 14f, 1
4r extends in the cylinder row direction and is provided on the left and right banks Bf, Br.
Are disposed above the cylinder head covers 3f and 3r and below the left and right ends of the intercooler 13, respectively.

The supercharger 6 is surrounded and sealed by an enclosure 18 around its periphery. More specifically, the enclosure 18 is formed by being divided into two parts, the upper and lower parts, and as shown in FIG. 5, the lower enclosure 18 a has six enclosures provided on the wall surface between the V banks of the cylinder block 2. It is fixed to the bosses 19a to 19f with bolts. Then, the intake inlet 6b at the rear of the supercharger 6 and the intake outlet 6d on the right side of the central portion are brought into a state in which they can be connected to the external intake passage 10, respectively, and the supercharger 6 is attached to the lower enclosure 18
It is housed in a, has its upper part covered by an upper enclosure 18 b, and is hermetically sealed in the enclosure 18. A coupling 7 connected to the drive shaft 6a of the supercharger 6 is also housed in the front space of the enclosure 18, and the coupling 7 is rotatably supported by the enclosure 18 via a bearing 20. Has been done. In addition, a rubber member 7b is provided at the coupling portion of the coupling 7 with the drive shaft 6a of the supercharger 6, so that when the driving force is transmitted, the gear noise generated from the speed increasing gear of the supercharger 6 is transmitted. The pulley 7 mounted on the shaft portion of the coupling 7 from the drive shaft 6a
It is controlled to be transmitted to a.

Further, one end of the intake passage 10 communicates with a communication passage 17 that communicates the downstream ends of the surge tanks 14f and 14r with each other, and the other end of the intake passage 10 has a downstream communication that communicates with the front space of the enclosure 18. A passage 21 and an upstream communication passage 22 having one end communicating with the space near the intake / discharge portion 6c at the rear of the enclosure 18 and the other end communicating with the upstream intake passage 10 of the throttle body 11 are provided. There is. An ISC valve 24 is arranged in the middle of the upstream communication passage 22 so that the flow rate of intake air flowing through the upstream communication passage 22 is adjusted according to the operating condition. The downstream side communication passage 21 and the upstream side communication passage 22 are communicated with each other through a sealed space inside the enclosure 18. That is, the two communication passages 21 and 22 branch from the communication passage 17 of the surge tank that constitutes the intake passage 10 on the downstream side of the intercooler 13, and the upstream side of the throttle valve 12 with a space in the enclosure 18 interposed therebetween. A bypass passage 23 that joins the intake passage is configured.

Therefore, also in this embodiment, as in the first embodiment, the space between the banks Bf and Br is not narrowed by the pedestal 26 of the intercooler, and the torsional rigidity of the cylinder block 2 is improved. Is completed,
The resonance frequency of the torsion bending of the power plant bending caused by the torsional rigidity of the cylinder block 2 can be shifted to the high frequency side, and the generation of muffled noise due to the resonance of the power plant in the engine normal rotation speed range can be prevented. .

The intake port 6d of the supercharger 6 arranged between the banks Bf and Br is open toward the front side, and the intercooler 13 is arranged directly above the supercharger 6. Since the intake air inlet 13a is provided at the lower front side at a position corresponding to the intake air outlet 6d of the supercharger 6 in the left-right direction, the intake air from the supercharger 6 to the intercooler 13 on the downstream side. The passage 10 can be shortened, intake resistance can be reduced, and the response of the engine 1 can be improved.

[0026]

As described above, according to the reinforcing structure of the V-type engine in the first aspect of the invention, the banks are closed via the pedestals of the intercoolers fixed to the cylinder heads of the banks. Since the cross section is formed, the torsional rigidity of the cylinder block can be improved without narrowing the space between the banks, and the resonance frequency of the torsional bending of power plant bending caused by the torsional rigidity of this cylinder block is shifted to the high frequency side. It is possible to prevent muffled noise due to resonance of the power plant in the engine normal speed range.

Further, since the surge tanks of each bank are connected to the lower parts of the left and right banks of the intercooler, respectively, the intake passage on the downstream side of the intercooler can be efficiently shortened, and the intake resistance can be reduced. It is possible to improve the response of the engine.

Further, in the invention of claim 2, when the mechanical supercharger is provided, the intake passage length to the intercooler connected to the downstream side of the mechanical supercharger can be shortened, and the mechanical supercharger can be shortened. By reducing the intake resistance in the intake passage on the downstream side of the machine, it is possible to effectively improve the response of the engine, particularly the response during supercharging operation.

[Brief description of drawings]

FIG. 1 is a front view showing the overall configuration of a V-type engine according to a first embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view showing the overall configuration of a V-type engine according to a second embodiment of the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is a diagram showing attachment of an enclosure.

[Explanation of symbols]

1 engine 2 cylinder block 3f, 3r cylinder head Bf, Br Bank 6 supercharger (mechanical supercharger) 6d Intake and discharge port 14r, 14r surge tank 13,30,31 Intercooler 13a, 30a, 31a Intake inlet 26 pedestal 30c, 31c Intake and discharge part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location F02F 7/00 N 8503-3G F02M 35/10 102 J 9247-3G

Claims (2)

[Claims] 1. In a V-type engine having a pair of banks facing each other on the left and right, and a surge tank corresponding to each of the banks, an intercooler is installed above the surge tanks of the banks, Each of the surge tanks is connected to the lower part of the side portion corresponding to each bank of the intercooler, and a pedestal for installing the intercooler is provided, and the pedestal is fixed to each cylinder head portion of both banks. Reinforcement structure of V-type engine characterized by being. 2. A mechanical supercharger driven by an engine output shaft is provided between both banks, and an intake air discharge port of the mechanical supercharger is arranged close to an intake air intake port of the intercooler. The reinforcing structure for a V-type engine according to claim 1.