JP2009215951A - Cylinder direct injection type internal combustion engine - Google Patents

Abstract

Provided is a V-type internal combustion engine in which the clearance of each part is compatible.
In an in-cylinder direct injection internal combustion engine, the intake valve operating mechanism is a rocker arm type having a support point outside the intake valve, and the exhaust valve operating mechanism is an exhaust valve. 7, the cylinder fuel injection valve 11 and the spark plug 12 are arranged side by side between the intake valve operating mechanism 9 and the exhaust valve operating mechanism 10. This is a direct injection type internal combustion engine that is arranged at different angles and is arranged such that the distance between the pressure accumulating chamber 13 and the combustion chamber 4 is different from the distance between the coil 14 and the combustion chamber 4.
[Selection] Figure 1

Description

  The present invention relates to an in-cylinder direct injection internal combustion engine in which a fuel injection valve and a spark plug are installed in a substantially central portion at the upper part of a combustion chamber.

Conventionally, in a direct injection type internal combustion engine, by arranging the fuel injection valves and spark plugs of adjacent cylinders at different angles in a direction orthogonal to the cylinder arrangement direction, In addition, there is a type in which the fuel injection valve and the ignition plug of the same cylinder are greatly inclined in the cylinder arrangement direction while making it possible to avoid interference with the ignition plug and the ignition coil on the upper side.
JP 2006-52666 A

  However, in the case of a so-called direct-acting cam in which the cam that opens and closes the intake / exhaust valve directly contacts the intake / exhaust valve, the fuel injection valve and the spark plug are arranged between the camshafts. The distance becomes longer, the valve clamping angle of the intake / exhaust valve becomes wider, the shape of the combustion chamber becomes convex, and the piston crown surface is also convex. Therefore, there is a problem that the surface area of the combustion chamber is increased, and the fuel consumption is deteriorated as heat loss increases.

  Accordingly, an object of the present invention is to reduce the valve sandwich angle by reducing the distance between the camshafts and to reduce the surface area of the combustion chamber to suppress the deterioration of fuel consumption.

  The present invention includes a pressure accumulation chamber that accumulates fuel of a predetermined pressure, a fuel injection valve that directly injects fuel from the pressure accumulation chamber into a combustion chamber, and a coil that performs spark ignition on fuel injected from the fuel injection valve. A spark plug, an intake valve valve mechanism for opening and closing the intake valve, and an exhaust valve valve mechanism for opening and closing the exhaust valve, the injection hole of the fuel injection valve and the electrode of the spark plug In the cylinder direct injection internal combustion engine disposed so as to face a substantially central portion of the upper surface of the combustion chamber, the valve operating mechanism for the intake valve includes a rocker arm having a support point outside the intake valve, and the exhaust valve The valve operating mechanism includes a cam that contacts the exhaust valve, and the fuel injection valve and the spark plug are arranged side by side between the valve operating mechanism for the intake valve and the valve operating mechanism for the exhaust valve, Arranged at different angles to the combustion chamber, The distance between the pressure chamber and the combustion chamber, arranged to be different from the distance between the coil and the combustion chamber.

  According to the present invention, by adopting an intake valve mechanism having a rocker arm, the distance between the shafts is shortened compared to a direct-acting valve mechanism that opens and closes the intake valve with a cam. The corner can be narrowed. Thereby, the surface area of a combustion chamber is made small and the deterioration of a fuel consumption is suppressed. In addition, the fuel injection valve and the spark plug of each cylinder are arranged at different angles in the cylinder arrangement direction, and the pressure accumulation chamber and the coil are arranged so as to be in a vertical relationship. And a spark plug can be arranged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 2 show a direct injection type internal combustion engine according to an embodiment of the present invention. In the internal combustion engine, a combustion chamber 4 is formed by a cylinder head 1, a cylinder block 2, and a piston 3. And communicate with each other. The intake valve 5 and the exhaust valve 7 are opened and closed by an intake valve operating mechanism 9 and an exhaust valve cam 10, respectively.

  The intake valve operating mechanism 9 is a rocker arm type valve operating mechanism, and is disposed substantially orthogonal to the cylinder arrangement direction of the internal combustion engine. One end of the cylinder head 1 is in contact with the upper end of the intake valve 5; A swing-type rocker arm 9a whose other end is pivotally supported by the cylinder head 1 and an intake valve cam 9b that abuts against an intermediate portion of the rocker arm 9a are provided. 9a opens and closes the intake valve 5. On the other hand, the exhaust valve cam 10 constitutes a so-called direct-acting valve mechanism that directly contacts the exhaust valve 7.

  A fuel injection valve 11 and a spark plug 12 are inclined on the upper surface (cylinder head) of the combustion chamber 4 as will be described later, and the injection hole 11a of the fuel injection valve 11 and the electrode 12a of the spark plug 12 are connected to the combustion chamber. It is arranged facing the approximate center. A common rail (accumulation chamber) 13 for accumulating a predetermined pressure of fuel is connected to the upper portion of the fuel injection valve 11 via a fuel pipe 13 a, and a coil 14 is connected to the upper portion of the spark plug 12. The fuel is supplied from the common rail 13 through the fuel pipe 13a to the fuel injection valve 11 and directly injected into the combustion chamber 4 from the injection hole 11a.

  Here, as shown in FIG. 1, the fuel injection valve 11 and the spark plug 12 are disposed so as to be inclined at different angles in a direction perpendicular to the engine cylinder arrangement. About this direction, one side may stand upright and the other may be inclined, or may be inclined to the opposite side, or may be inclined to the same side if they are at different angles. In the figure, the fuel injection valve 11 is disposed on the exhaust valve 7 side, but a spark plug 12 may be disposed.

  In this way, the fuel injection valve 11 and the spark plug 12 are installed at different angles in the direction orthogonal to the engine cylinder arrangement direction, so that the fuel injection valve 11 and the common rail 13 disposed above the fuel injection valve 11 are disposed. It becomes possible to avoid interference between the ignition plug 12 of the adjacent cylinder and the coil 14 disposed on the upper part. As shown in FIG. 2A, the fuel injection valve 11 and the spark plug 12 of the same cylinder are arranged so as to be largely inclined at different angles in the cylinder arrangement direction.

  Further, the common rail 13 and the coil 14 may be disposed adjacent to each other in the vertical direction, and either one may be positioned above. At this time, the coil 14 and the common rail 13 may be configured integrally.

  The common rail 13 and the fuel injection valve 11 are arranged coaxially as viewed from the cylinder arrangement direction, and the common rail 13 is usually larger than the fuel injection valve 11. Similarly, the coil 14 and the spark plug 12 are coaxially arranged, and the coil 14 is larger than the spark plug. Therefore, when the common rail 13 and the coil 14 are arranged in a vertical relationship, when the common rail 13 is located below, the common rail 13 is arranged so as to contact the spark plug 12, and when the coil 14 is located below. Is arranged so that the coil 14 is in contact with the fuel injection valve 11 or the fuel pipe 13 a that connects the fuel injection valve 11 and the common rail 13.

  Next, the operation will be described.

  In the direct injection internal combustion engine, in order to perform stratified combustion with a wide generation region, the injection hole 11a of the fuel injection valve 11 is ignited at the upper center of the combustion chamber 4 and for efficient combustion. It is desirable that the electrode 12a of the plug 12 is also arranged approximately at the center of the upper portion of the combustion chamber 4.

  For this reason, in the case of a four-valve engine as in this embodiment, it is desirable to install the nozzle hole 11a and the electrode 12a in a place surrounded by two intake valves and two exhaust valves. In this case, with respect to the arrangement of the nozzle holes 11a and the electrodes 12a, when the nozzle holes 11a and the electrodes 12a are arranged in series in parallel with the cylinder arrangement direction as shown in FIG. The inclination angle of the fuel injection valve 11 and the spark plug 12 in the cylinder arrangement direction can be increased without interference with the shaft.

The intake valve operating mechanism 9 is a rocker arm type having a support point on the outside of the intake valve 5 and a direct acting type in which the cam 10 abuts the exhaust valve 7 on the exhaust side. In the case of an internal combustion engine, the distance between the camshafts can be reduced and the valve sandwich angle can be reduced while suppressing the dimension in the direction (width direction) orthogonal to the cylinder arrangement direction of the internal combustion engine. For this reason, the surface area of the combustion chamber 4 can be reduced and deterioration of fuel consumption can be suppressed.
Further, by adopting a rocker arm type having a support point on the outside of the intake valve 5, especially when a variable valve mechanism is used for the valve mechanism for the intake valve, the valve mechanism is fuel-injected due to an increase in the valve mechanism By suppressing the approach to the valve or the ignition coil, the valve sandwich angle can be reduced. For this reason, the surface area of the combustion chamber 4 can be reduced and deterioration of fuel consumption can be suppressed.

  Further, since the fuel injection valve 11 and the spark plug 12 arranged between the cams are arranged vertically, the rocker arm type valve operating mechanism 9 is used while suppressing the dimension in the direction perpendicular to the cylinder arrangement direction. It becomes possible to arrange between narrowed cams. Moreover, the protrusion to the area | region outside the exhaust valve 7 shown with an oblique line in FIG. 1 can be suppressed, and layout property can be improved.

  When the common rail 13 that supplies fuel to the fuel injection valve 11 is installed below the coil 14, the common rail 13 is fixed to the cylinder head 1 and the coupling rigidity between the common rail 13 and the cylinder head 1 is increased. Can do. Moreover, by fixing the coil 14 to the common rail 13 integrally, it is not necessary to fix the coil 14 to the rocker cover, and the shape of the rocker cover can be simplified.

  On the other hand, when the coil 14 of the spark plug 12 is installed below the common rail 13, the distance from the electrode 12a of the spark plug 12 to the coil 14 can be shortened, and the voltage is supplied to the electrode 12a. Attenuation can be suppressed.

  The present invention is not limited to the embodiment described above, and various modifications and changes can be made within the scope of the technical idea, and it is obvious that these are equivalent to the present invention.

1 is a front view around a cylinder head of an internal combustion engine according to the present invention. The side view and sectional drawing similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Combustion chamber 5 Intake valve 6 Intake port 7 Exhaust valve 8 Exhaust port 9 Valve mechanism for intake valve 9a Rocker arm 9b Cam for intake valve 10 Cam for exhaust valve 11 Fuel injection valve 11a Injection hole 12 Spark plug 12a Electrode 13 Common rail 14 coil

Claims (7)

A pressure accumulation chamber for accumulating fuel of a predetermined pressure;
A fuel injection valve for directly injecting fuel from the pressure accumulation chamber into the combustion chamber;
A spark plug with a coil for performing spark ignition on the fuel injected from the fuel injection valve;
An intake valve operating mechanism for opening and closing the intake valve;
An exhaust valve operating mechanism for opening and closing the exhaust valve;
In-cylinder direct injection internal combustion engine in which the nozzle hole of the fuel injection valve and the electrode of the ignition plug are arranged facing the substantially central portion of the upper surface of the combustion chamber,
The intake valve operating mechanism includes a rocker arm having a support point outside the intake valve,
The exhaust valve operating mechanism includes a cam that contacts the exhaust valve,
The fuel injection valve and the spark plug are arranged side by side between the valve mechanism for the intake valve and the valve mechanism for the exhaust valve, and are inclined at different angles with respect to the combustion chamber,
The distance between the pressure accumulating chamber and the combustion chamber is arranged to be different from the distance between the coil and the combustion chamber.
An in-cylinder direct injection internal combustion engine. The pressure accumulating chamber is disposed on the side closer to the combustion chamber than the coil and on the exhaust valve side,
The in-cylinder direct injection internal combustion engine according to claim 1. Arranged so that a part of the accumulator and the coil overlap when viewed from the central axis direction of the spark plug,
3. The direct injection type internal combustion engine according to claim 2, wherein The pressure accumulation chamber and the coil are formed integrally.
3. The direct injection type internal combustion engine according to claim 1, wherein the direct injection type internal combustion engine is used. The coil is disposed closer to the combustion chamber than the pressure accumulation chamber and closer to the exhaust valve.
The in-cylinder direct injection internal combustion engine according to claim 1. An accumulator chamber that extends in the direction of the engine cylinder row and accumulates fuel of a predetermined pressure;
A fuel injection valve for directly injecting fuel from the pressure accumulation chamber into the combustion chamber;
A spark plug with a coil for performing spark ignition on the fuel injected from the fuel injection valve;
An intake valve operating mechanism for opening and closing the intake valve;
An exhaust valve operating mechanism for opening and closing the exhaust valve;
In-cylinder direct injection internal combustion engine comprising a plurality of cylinders arranged such that the nozzle hole of the fuel injection valve and the electrode of the spark plug face the substantially central portion of the upper surface of the combustion chamber,
The intake valve operating mechanism includes a rocker arm having a support point outside the intake valve,
The exhaust valve operating mechanism includes a cam that contacts the exhaust valve,
The fuel injection valve and the ignition plug are arranged side by side between the valve mechanism for the intake valve and the valve mechanism for the exhaust valve, and are inclined at different angles at least in a direction perpendicular to the cylinder row direction. ,
The pressure accumulating chamber and the coil are arranged to be shifted in the center direction of the cylinder cross section,
An in-cylinder direct injection internal combustion engine. The pressure accumulating chamber is disposed on the combustion chamber side with respect to the coil and on the exhaust valve side,
The in-cylinder direct injection internal combustion engine according to claim 6.

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