JPH02252919A - Intake device for v type engine with supercharger - Google Patents

Abstract

PURPOSE:To obtain a compact intake system by effectively utilizing the space formed between the right and left banks by arranging two rotors of a supercharger in the longitudinal direction, and arranging the shorter diameter of the supercharger between the right and left banks of a V type engine. CONSTITUTION:A screw type supercharger 5 in the combination of a male rotor 5a and a female rotor 5b is installed in the space 4 between the right and left tanks 2 and 3 of an engine 1 constituted into a V type multicylinder. The male and female rotors 5a and 5b are arranged in the longitudinal direction. While, the intake ports 6 and 7 of the right and left banks 2 and 3 are connected with the branched pipe parts 11a and 11b of the intake collecting pipes 10a and 10b through connecting pipes 8 and 9. A driving pulley 19 is connected with the supercharger 5 through an electromagnetic clutch, and the driving pulley 19 is interlockingly connected with the driven pulley 20 of the engine 1 and a crank pulley 21 through belts 22 and 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake system for a supercharged V-type engine equipped with a supercharger that is driven by the output shaft of the engine during left and right punctures.

(Prior art) When a V-type engine is equipped with a mechanical supercharger that is driven by the engine's output shaft via a belt, etc., ■ In order to effectively utilize the space between the banks, the supercharger is placed between the punctures. The idea of arranging the
It has been known in the past as described in Japanese Utility Model Application Publication No. 61-1824.

However, when installing a mechanical supercharger with two rotors on a V-type engine like this, if the capacity of the supercharger increases, it becomes difficult to freely arrange it between the left and right banks. There was a problem.

(Object of the Invention) The present invention has been made in view of the above problems, and provides a mechanical supercharger having two rotors between the left and right banks of a V-type engine. It is an object of the present invention to provide a configuration in which the above mechanical supercharger with a large capacity can be placed in a vehicle.

(Structure of the Invention) The present invention is equipped with a supercharger that supercharges the intake air supplied to the engine by driving two rotors driven by the output shaft of the engine between the left and right banks formed in a V shape. In a V-type machine/engine with a supercharger, the supercharger is arranged so that the two rotors are vertically aligned between the left and right banks.

(Effects) In a supercharger having two rotors, the rotors rotate while in contact with each other in order to supercharge air into the cylinder. Therefore, in the radial direction of the rotor shaft, the casing of this supercharger has a shape having a short axis approximately corresponding to the diameter of one rotor and a long axis that is at least larger than the short axis.

In addition, a V-type engine has a predetermined space between the left and right banks, but since an intake passage is arranged around each bank, there is a horizontal restriction between the banks, resulting in a vertically elongated space. .

From the above, by arranging the short diameter between the left and right banks, that is, by arranging the two rotors of the supercharger vertically, it is possible to effectively utilize the space formed between the banks, and to maintain the same size. Compared to a model with a horizontal supercharger,
It is possible to obtain a compact intake system with a small portion that exceeds the upper end of the bank.

(Example) Examples will be described below based on the drawings.

FIG. 1 is a front view of the V-type engine according to this embodiment, and FIG.
The figure is a plan view of the same. This engine 1 is a V-type six-cylinder engine, and three cylinders in each of the left and right banks are arranged offset from each other by a predetermined amount in the longitudinal direction of the engine. and,
In the space 4 between the left and right banks 2.3, there is a four-leaf male rotor 5a.
A so-called Reshirorum screw type supercharger 5, which is made up of a female rotor 5b having six grooves, is arranged in the longitudinal direction of the engine with the male and female rotors aligned vertically.

The intake ports 6.7 of the left and right banks 2.3 are connected to each bank 2.3.
The branch pipe portions 11a and flb of the intake manifold pipes 10a and 110b are
It is connected to the.

The intake manifold pipes 10a, 10b extend in the longitudinal direction of the engine in the left and right upper portions between the banks, and their respective branch pipe portions 11a, llb, together with the connecting pipe 8.9, form independent intake passages 12a corresponding to the respective tracheas of the left and right banks 2.3. , 12b. In these independent intake passages 12a112b, an injector 14 for injecting fuel is arranged near the engine-side attachment end of the connecting pipe 8.9 toward the intake port 6.7.

A drive pulley 19 is connected to the front end of the supercharger 5 via an electromagnetic clutch 18.
A belt 22.
23 is stretched. The crank pulley 21 is also connected to a belt 2 via an idler 27, as shown in FIG.
8 is installed. The supercharger 5 includes an intake manifold pipe 10a,
10b, between the left and right connecting pipes 8.9 and the injectors 14.14, and the left and right banks 2 from above.
．． The three independent intake passages 12a112b are supported and fixed by an extending mounting arm 15.1B to boss portions 41a and 41b formed on the engine side flange 8a19a of the connecting pipe 8.9. Bolts 42 and 42 for fixing the supercharger 5 pass through the boss portions 41a and 41b and fasten the engine body 1 together. By extending the arm 15, 16 from the upper part of the supercharger 5, it is possible to support the force exerted from below from above, and also to support the lateral force between the connecting pipes 8, 9, so that the driven pulley 20 By tightening the arm 15.18 and the connection 8.9 together, the vibration of the supercharger 5 is supported by the engine 1 body, so the entire intake system Vibration resistance can be obtained.

Moreover, if the side surfaces of the boss portions 41a and 41b are connected to the connecting pipe 8.9, the forces applied in the lateral direction can be mutually supported, so that the boss m41
The rigidity of both a and 41b and the connecting pipe 8.9 is improved, which is more preferable.

Moreover, the center of the bottom of the supercharger 5 is connected from the engine 1 to the supercharger 5.
It is connected to the engine 1 by a tubular pin 17, which is a lubricating oil path that sends lubricating oil to the engine 1, and can provide a so-called three-point support effect.

The supercharger 5 has an inlet portion 29 at the rear end, and this inlet portion 2
9 is connected to an intake pipe 31 connected to an air cleaner 30. A slow/robust body 32 is interposed in the middle of this intake pipe 31. Further, the supercharger 5 has a discharge port 38 on the side wall portion on the left nozzle 2 side. This discharge port portion 33 is located between the independent intake passages 12 al l 2 a of the left bank 2, and the discharge passage 34
A pipe 35 constituting the intake manifold passes between the intake manifold 8B13a of the left-hand manifold manifold 10a and the main body of the engine 1 and exits above the left bank 2 at right angles to the longitudinal direction of the engine. An intercooler 36 is arranged in front of the engine 1. The intercooler 36 is arranged to be offset to the left side with respect to the engine center, and its intake port 37 is located on the left side, and its discharge port 38 is located near the engine center. The discharge pipe 35 of the supercharger 5 bends toward the front above the left bank 2, and connects to the intercooler 3 at the left front of the engine 1.
It is connected to a pipe portion 38a constituting the above-mentioned suction port 37 of No. 6.

The left and right intake manifold pipes 10a, 10b merge at the upstream side of the intake manifold parts 13a, 13b near the engine center immediately in front of both banks 2, 3, and the merging passage 10c connects the electromagnetic clutch 18 and the supercharger 5. It extends forward above the drive pulley 19 and is connected to the discharge port 38 of the intercooler 36 .

The intake passages leading to the left and right intake manifold pipes 10a and 10b merge in this way and connect to the intercooler 3 near the engine center.
6, the intake passages from the intercooler 36 to each cylinder of the left and right banks 2.3 are short and of uniform length, thus reducing intake resistance. Left and right distribution is also improved. In addition, a pipe 35 constituting the discharge passage of the supercharger 5
As mentioned above, the independent intake passages 12a, 12 of the left bank 2
The intake system is compact as a whole, and the intake system is connected to the intercooler which is arranged at one side and is brought out from between the engine 1 main body and the intake air gathering part 13a to the side at right angles to the longitudinal direction of the engine. It has low resistance.

The downstream side of the left and right intake manifold pipes 10a and 10b is a communication passage 10d.
connected by. As a result, the resonance tuning point of the intake system shifts to the high engine speed side, improving charging efficiency in the high speed range. Further, a bypass passage 39 is provided that connects the communication passage 10d and the upstream side of the supercharger 5, and the electromagnetic clutch 18 connected to the bypass passage 39 is disengaged to disable the supercharger 5 in the engine low load range. A pressure-responsive on-off valve 40 is interposed to open the passage. When the supercharger 5 is not operating, this on-off valve 40 is opened and air is taken in without going through the supercharger 5.

In the above embodiment, a Lysholm type supercharger was used as the mechanical supercharger, but the present invention is applicable to a V-type mechanical supercharger equipped with a Roots type or other mechanical supercharger having two rotors. It can also be applied to engines.

In addition, the definition of vertical arrangement in the present invention is an extension line A extending vertically from the output shaft center 21a of the engine 1.
and a line connecting the axes of the two rotors 5as5b of the supercharger 5, and an angle θ2 formed by the left and right banks 2.3 with respect to the extension line A, then θ1 is 6.
The arrangement should be such that the number is 2 or less.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a schematic diagram illustrating the vertical arrangement defined by the present invention. 1: Engine, 2.3: Bank, 5: Supercharger,
5a15b: Rotor, A: Extension line vertically installed directly above the output shaft center of the engine.

Claims (1)

[Claims] (1) V-type engine with a supercharger, which has two rotors driven by the output shaft of the engine between the left and right banks formed in a V-shape, and is equipped with a supercharger that supercharges the intake air supplied to the engine. An intake system for a V-type engine with a supercharger, characterized in that the supercharger is arranged such that the two rotors are vertically aligned between left and right banks.