JPS6032934A - Valve device of supercharging cylinder in supercharged multi-cylinder internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve the supercharged pressure and the intake efficiency by shrinking the gap space and improving the volume efficiency in a supercharging cylinder. CONSTITUTION:A valve fitting member 25 with an angle cross section fitted with reed plates 27, 27 in an intake valve 22 is inserted into an intake port 14, and a valve fitting member 25 with an angle cross section fitted with reed plates 30, 30 in a discharge valve 28 is inserted into a discharge port 16. Accordingly, the gap space is made smaller by a distance that the reed plates 30, 30 are inserted in the discharge port 16 as compared with the case when the reed plates 30 in the discharge valve 28 are located outside the discharge port 16.

Description

Detailed Description of the Invention The present invention provides a multi-cylinder internal combustion engine in which some of the cylinders are configured as supercharging cylinders for compressing intake air for other combustion cylinders. The present invention relates to a valve device for inhaling and discharging air in a cylinder.

A multi-cylinder internal combustion engine in which some of the cylinders are used as supercharging cylinders for other combustion cylinders was proposed in Japanese Patent Publication No. 55-27218 and Japanese Patent Application Laid-open No. 52-76517. ing. The supercharging cylinder in this type of supercharged internal combustion engine has an intake valve that opens when air is taken in and closes when air is discharged, and a discharge valve that closes when air is taken in and opens when air is discharged. A valve is required, and in both of the above publications, the intake valve is a check valve type and is installed in the intake boat to the supercharging cylinder, while the discharge valve is installed as an intake valve in another combustion cylinder. I am trying to have it used for both.

However, in the prior art described above, the cylinder volume at the time of the compression path when the piston of the supercharging cylinder reaches the top dead center and the time when the piston starts suction on the downward stroke from the top dead center is limited to the supercharging cylinder volume. The volume of the discharge passage between the cylinder chamber of the combustion cylinder and the intake valve of the other combustion cylinder is added, and the gap volume at the end of compression and the beginning of suction is large, so the volume of the discharge passage in the cylinder for supercharging is large. The gap volume ratio becomes large, and therefore the volumetric efficiency in the supercharging cylinder decreases, resulting in low intake efficiency into the combustion cylinder and low supercharging efficiency.

The present invention provides a multi-cylinder combustion engine in which some of the plurality of cylinders are configured as supercharging cylinders for other combustion cylinders as described above, in which a plate is installed in the intake boat of the supercharging cylinder. In addition to providing a check valve type suction valve with a spring reed plate, the discharge bow 1-
Also, by providing a discharge valve having a reed plate made of a leaf spring, the volume of the discharge passage leading from the supercharging cylinder to the combustion cylinder is configured so as not to be added to the gap volume.
In addition to the suction valve for the suction boat, the discharge valve for the discharge boat is also provided in a form that allows easy installation and removal of the discharge valve within the discharge boat, thereby making it easier to assemble and maintain the suction and discharge valves. The gap volume has been further reduced without impairing inspection efficiency.

The following describes an example in which the present invention is applied to a three-cylinder engine. In the figure, fl+ is the first cylinder (2).
The third cylinder (4) is a 4-cycle combustion cylinder, and the second cylinder (3) is a 2-cycle supercharging cylinder. is an intake valve (51 (intake boat with 61 + 71 (81) and an exhaust valve (9 + exhaust boat (11) with 001 (12)), and the second cylinder (3) has an intake port that opens on one side of the engine (13). The engine is equipped with a boat (14) and a discharge boat (16) that opens on the other side of the engine (15), and the pistons of the first cylinder (2) and the third cylinder (4) move up and down at the same time and in the same phase. The piston of the second cylinder (3) moves up and down in the opposite direction to the pistons of the first and third cylinders, so that
While the difference is 80 degrees, the first cylinder (2) and the third cylinder (4
) means that when the first cylinder (2) is in the explosion stroke, the third cylinder (4)
) is the intake stroke, the firing order is 36 in crank angle.
The difference is 0 degrees, and during the first compression stroke of the second cylinder (3), the third cylinder (4) is on the intake stroke, and during the next compression stroke of the second cylinder (3), the first cylinder (2) is on the intake stroke. This is the intake stroke, and the stroke volume in the second cylinder (3) is the same as that in the first and third cylinders (
2) It is set to the volume required for supercharging for (4).

(17) is an air cleaner for intake;
17) to the second cylinder (3) via the intake passage (18).
while connecting to the intake bow 1- (14) of the 2nd cylinder (
The discharge boat (16) of 3) is connected to the first cylinder (2) through a supercharging passage (21) equipped with a surge tank (19) for reducing pulsation and a fuel supply means such as a carburetor (20). and the intake boat (8) of the third cylinder (4).

(22) shows a check valve type suction valve for the suction boat (14) of the second cylinder (3), and the suction valve (22) has a chevron-shaped cross section integrally provided with an annular flange (24). A plurality of window holes (25) are drilled in the valve mounting member (23) on both upper and lower outer surfaces of the valve mounting member (23), and screws (26) etc. are inserted at the base end of the valve mounting member (23). It consists of a pair of fixed leaf spring reed plates (27), and the suction valve (22) is connected to the suction boat (
14) Insert the flange (24) into the suction bow) (1
4) is installed so that it is in close contact with the engine side (13) where it opens.

Also, (2nd) is the discharge boat (16) of the second cylinder (3).
The discharge valve (28) includes a valve mounting member (29) having a chevron-shaped cross section integrally provided with an annular flange (29'), and the valve mounting member (29). ), there are multiple window holes (30) drilled in the lower inner surface of the
It consists of a pair of leaf spring lead plates (32) (32) fixed at the base end with screws (31) etc. so as to close the
To install this discharge valve (28), insert the member (28) into the discharge bow (16) and attach the flange (29') to the other side of the engine (15) where the discharge bows 1 to (16) open. These are made up of two lead plates (=J) that are placed in close contact with each other.
) and (32) showing the stomper plate).

In addition, the exhaust boat (1
1") (12) is connected to an exhaust manifold (35), and the mass of the reciprocating part and the mass of the rotary part in the first cylinder (2) and the third cylinder (4) are the same, The mass of the reciprocating part and the mass of the rotary part in the second cylinder (3), which is located in the middle, are the mass and rotation part of the reciprocating part of the other cylinder, that is, the first cylinder (2) or the third cylinder (4). By setting the mass to approximately twice the mass of the moving part, the balance between the reciprocating mass and the rotating mass is maintained.

In this configuration, the piston (
During the first compression stroke due to the upward movement of 36), the third cylinder (4) is on the intake stroke, and during the next compression stroke of the second cylinder (3), the first cylinder (2) is on the intake stroke. The pressurized air sucked into the second cylinder (3) from the air cleaner (I7) and compressed in the second cylinder (3) is transferred to the first cylinder (2).
In this case, a carburetor (20), etc. is used to supply fuel to the intake air to the first cylinder (2) and the third cylinder (4). If the fuel supply means is provided downstream of the second cylinder for supercharging (3), the fuel supplied by the carburetor (20) will be supplied to the second cylinder for supercharging (3). the first for combustion without passing through
It is sent to cylinder (2) and third cylinder (4).

As shown in the pressure diagram in Fig. 1, the second cylinder (3) starts compression from one point when the piston moves upward from the bottom dead center, and the pressure inside the cylinder reaches P! ? When it reaches point 2, the discharge valve (28) opens to release compressed air, and at point 3, the piston reaches top dead center, and as the piston descends, the pressure inside the cylinder changes from P2 to PI, which is below atmospheric pressure. It expands and descends until it reaches the 4th point, the suction valve (22) opens, and returns to the 1st point while sucking in air, forming a cycle.

In the pressure diagram of Fig. 5, if the stroke volume is V, the gap volume is Vc, and the volume when new air intake starts at 4 points after expansion between 3 and 4 is Vd, then between 4 and 1 the new The volume of air actually inhaled is V-(Vd-Vc)
Therefore, the volumetric efficiency y)v becomes y a = L two rotations 1---yc to -ydanVv...■. On the other hand, since the state change in the pressure diagram is a poly1-rope change and Pv'''-constant, the smaller is, that is, the smaller the gap volume is, the thicker (becomes).

In this case, the present invention provides a system in which, in addition to providing an intake valve (22) at the intake port (14) in the second cylinder for supercharging (3), a discharge valve (28) is provided at the discharge boat (16). Therefore, the volume of the passage between the cylinder chamber of the supercharging cylinder and the intake valve f51%l of the combustion cylinder is not added to the clearance volume Vc as in the prior art described above. .

Moreover, the present invention provides a reed plate (
27) A member (2) with a chevron-shaped cross section and a number of valves to which (27) is attached.
In addition to inserting 5) into the suction port (I4),
The valve mounting member (28) with a chevron-shaped cross section to which the lead plate (30) (30) of the discharge valve (28) is attached is attached to the discharge valve 1-
(16) By inserting it into the gap, the gap volume νC
is the reed plate (30) that goes down to the discharge valve (28) (30
) is smaller when the lead plate (30) is located inside the discharge boat (16) than when it is located outside the discharge boat (16), so the two work together to significantly reduce the gap volume. Therefore, the volume ratio of 9 can be adjusted to -F.

In addition, the suction valve (22) is inserted into the suction port (14), and its lead Fj, (27) and the valve mounting part IA (2) with (27) are connected.
5) is inserted into the engine side (13) of the suction port (14) and installed, while the discharge valve (28) is inserted into the discharge boat (16) and its leet plate (30) is installed.
By inserting and attaching the valve mounting member (28) with the valve attachment member (28) from the opening of the discharge bow 1- (16) to the other side of the engine (15), the intake passage (1B) to the suction port (14) is installed.
The suction valve (22) and the discharge valve (28) can be removed and removed by connecting and disconnecting the supercharging passageway (21) to and from the discharge boat (16).

Note that the above-mentioned embodiment is a medium-fired second engine connected to a three-cylinder engine.
Although the cylinder (3) is used as a supercharging cylinder, the first cylinder (2) or the third cylinder (3) may be used as a supercharging cylinder, and the other cylinders may be used as combustion cylinders. It goes without saying that the present invention can be similarly applied to multi-cylinder engines such as 4-cylinder or 6-cylinder engines. Further, the present invention provides that both the suction boat and the discharge boat in the supercharging cylinder are arranged on one side (13) or the other side (13) of the engine.
15) can also be applied.

In summary, the present invention provides a multi-cylinder internal combustion engine in which some cylinders among a plurality of cylinders are configured as supercharging cylinders for other combustion cylinders. Insert a valve number (1 member) for an intake valve with a chevron-shaped cross section toward the inside of the intake boat, and insert a window hole in the valve mounting member on the outer surface of the valve mounting member for the intake valve so that it is cool. While fixing the reed plate at its base end, a valve mounting member for a discharge valve having a chevron-shaped cross section is inserted into the opening of the discharge boat in the supercharging cylinder toward the side of the engine. and a supercharged multi-cylinder internal combustion engine characterized in that a reed plate having a cold window hole extending through the valve mounting member is fixed to the inner surface of the valve mounting member for the discharge valve at its base end. This is a valve device for a supercharging cylinder. With this configuration, the gap volume in the supercharging cylinder can be reduced and the volumetric efficiency can be significantly improved, so the supercharging pressure and intake efficiency for the combustion cylinder can be improved. In addition, the installation and removal of the intake valve and discharge valve in the supercharging cylinder is easy, as is the connection and removal of the intake passage to the supercharging cylinder, as well as the weekly charging cylinder. It is extremely easy to connect and remove the supercharging passage, and there is no need to disassemble the entire engine for maintenance and inspection9.
) also has fruits.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view, FIG. 2 is an enlarged sectional view taken along H-II of FIG. 1, FIG. 3 is an I-m view of FIG. is an IV-JV view of FIG. 2, and FIG. 5 is a pressure diagram of the supercharging cylinder. (1)...Engine, +21 (31 (41...Cylinder, (]7)...Air cleaner, (18)...
Intake passage, (2o)...carburizer, (14) suction boat, (16)...discharge boat, (22)...intake valve, (25)...valve mounting member, (27)...
Lead plate, (28)...Discharge valve, (29)...
・Valve mounting member, (32)...Lead plate. Patent applicant Daihatsu Motor Co., Ltd.

Claims (1)

[Claims] (1) In a multi-cylinder internal combustion engine in which some of the plurality of cylinders are configured as supercharging cylinders for other combustion cylinders, an opening to the engine side of the intake boat in the supercharging cylinder Insert a valve mounting member for an intake valve with a chevron-shaped cross section into the intake boat, and attach a reed plate with a window hole in the valve mounting member to the outside surface of the valve mounting member for the intake valve. While fixed at the base end, a valve mounting member for a discharge valve having a chevron-shaped cross section is inserted into the opening of the discharge boat in the supercharging cylinder toward the side of the engine, and the valve mounting member for the discharge valve is inserted into the discharge boat. 1. A valve device for a supercharging cylinder in a supercharged multi-cylinder internal combustion engine, characterized in that a reed plate is fixed to the inner surface of the mounting member at its base end so as to close a window hole in the valve mounting member.