JPS601371A - Fuel injection quantity regulator for internal-combustion engine - Google Patents

Abstract

PURPOSE:To make adjustment to an injection quantity controlling lever ever so easy, by connecting the injection quantity controlling lever of a fuel injection valve to be installed in each cylinder, to a control rod being locked by a jig as making it a position for the injection quantity regulating state, in time of assembling a multicylinder engine. CONSTITUTION:When a fuel injection valve (unit injector) 8 is set to a row-cylinder internal-combustion engine 2 in an outboard motor for a small ship, each fuel injection quantity controlling lever 45 of injection valves 8 is connected to a control rod 11 in a maximum state of injection quantity by means of set screws 47. At this time, as a jig to prevent the rod 11 from tottering in both axial and circumferential directions, a clamping screw 49, which lockes the control rod 11 to a setting block 43 in the maximum state of fuel quantity, is installed. And, in the state that the rod 11 is locked to the setting block 43, the said lever 45 is set to a maximum injection quantity position and then these set screws 47 being displaceable along each long slit 48 are clamped tight, thus coupling of these levers 45 to the rod 11 takes place.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection amount adjusting device for a multi-cylinder internal combustion engine in which a unit injector is installed for each cylinder.

In a multi-cylinder internal combustion engine in which a unit injector is installed for each cylinder, when assembling the engine, it is necessary to minimize the variation in the fuel FI injection of each unit injector and make the injection amount the same for each cylinder. Must be.

Therefore, in the past, generally speaking, each fuel injection amount control lever of each unit injector was set to the fuel injection amount f4.
An adjustment method is used in which the fuel injection valve is connected to a control roller for adjusting the fuel injection amount with a screw via an adjuster in the first metering position.

Furthermore, generally, the lever of each unit injector is manufactured so as to come into contact with a collar provided on the unit injector at the position where the injection amount is maximum, and this position where the injection amount is maximum is the injection amount adjustment position Ill. .

However, in a multi-cylinder internal combustion engine with two or more cylinders, when two or more unit injectors are connected to a control rod via an adjuster and the injection amount of each unit injector is adjusted to be the same, However, there is a problem in that the control rod wobbles in its axial and rotational directions, making it difficult to adjust and causing variations in adjustment.

In order to eliminate this variation, it is necessary to fix the control rod at the maximum injection amount position.

On the other hand, the jig for fixing the control rod during adjustment must be a special type separate from the engine in order to deal with all situations in the market, and must be made from parts used in the engine. It is best if possible by combining them. However, if this jig is a very common part, it will not work because accidents like the one described above will occur, and the engine must not be able to rotate (operate) while this part is used as a jig. Must be.

After adjusting the unit injector to the maximum fuel injection amount as described above, if you mistakenly operate the internal combustion engine in that state, the engine will rotate at the maximum injection amount, which may lead to an accident that may damage the engine. There is.

SUMMARY OF THE INVENTION Therefore, the present invention facilitates and reliably adjusts the connection of the lever (1) for controlling the fuel injection amount of the unit injector to the control rod when assembling an internal combustion engine having a plurality of unit injectors as described above. This was done to prevent the engine from being accidentally operated while the unit injector remains at the maximum fuel injection amount after the adjustment.

That is, the fuel injection amount adjusting device of the present invention, when assembling a multi-cylinder internal combustion engine in which a unit injector is installed in each cylinder, adjusts the levers for controlling the fuel injection amount of all the unit injectors to inject the fuel, respectively. The control rod, which can be connected in the state of maximum fuel injection amount, is fixed with a jig in the state of maximum fuel injection amount, and furthermore, it is installed in a position where the internal combustion engine cannot operate with the jig attached. ”.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic side view of the main part of the stern of a small boat equipped with an outboard motor according to an embodiment of the present invention, and Fig. 2 shows FIG. 1 is a partial cross-sectional rear view of the main part of the connection between the control rod and the plurality of unit injectors.

First, in FIG. 1, the outboard motor attached to the stern 1 of a small boat consists of an internal combustion engine 2 and an outboard motor main body 6. A propeller screw 4 provided at the bottom of the propeller screw 4 is rotated through a propulsion shaft 10 connected to the crankshaft 6 to propel the small boat in the direction of arrow A, and the outboard motor projects forward. The ship is steered by moving the steering handle 5 left and right on the ship.

In this internal combustion engine 2, the crankshaft 6 is a vertical axis,
Therefore, the piston 7 slides horizontally, and a unit injector 8 is mounted on the cylinder head 9 facing the combustion chamber on the top side of the piston 7.
The combustion caused by the fuel injection causes the piston 7 to reciprocate twice in the horizontal direction, thereby rotating the crankshaft 6 provided in the vertical direction.

Further, as shown in FIG. 2, each unit injector 8 of the two-cylinder internal combustion engine 2 is provided with a lever 45 for fuel injection amount control fixed to a plunger (not shown). It is connected to the control rod 11, which moves up and down parallel to the shaft 6, via the fork of a lever 45, and is operated in the direction of fuel increase as indicated by arrow E.

Accordingly, in the present invention, as shown in FIG. When the injection amount is at its maximum, it is connected to the control rod 11 by set screws 47, and these set screws 47 are connected so as to be adjustable in the axial direction of the control rod 11 through elongated holes shown at 48 in FIG. It is now possible to do so.

In that case, as a jig to prevent the control rod 11 from wobbling in its axial or rotational direction, a fixing screw 49 is provided to fix the control rod 11 to the mounting base 46 in a state with maximum resistance to combustion. .

When the engine is in operation, a lever (not shown) directly connected to the pin 100 is linked to a governor (also not shown). And the unit injector 8 itself is
Each y < -45, : L = 7 injector 8
The amount of injection is adjusted in advance so that the amount of injection is the same when the injection occurs. The control rod 11 is the idle spring mounting base 46
When the lever 45 touches the unit injector 8, the amount of injection is adjusted in advance so that the same injection amount is obtained, and the unit injector 8 is fixed with the setscrew 47 so that it is at a certain position. In this case, if the position of the control rod 11 moves even slightly, the adjustment cannot be made properly. Therefore, it is preferable to fix the control rod 11 in the sliding and rotational directions with a jig 49. If the jig 49 is one without which the engine will not run (for example, a fuel air bleed screw), there will be no accident.

Note that the jig for fixing the control rod 11 at the maximum fuel injection amount as described above is not limited to the fixing screw 49 and the position of the fixing screw 49 in the above embodiment; Any type of jig and any position will be effective as long as the internal combustion engine 2 cannot operate with the jig attached.

Therefore, if the fuel injection amount metering device of the present invention is applied to an internal combustion engine having a plurality of unit injectors, it is possible to easily adjust the connection of the lever for controlling the fuel injection amount of the unit injector to the control rod. This adjustment can be carried out reliably and has the advantage that the engine will not be operated erroneously with the unit injector in the state of the maximum injection amount of fuel after the adjustment, and is effective as a safety protection device for the internal combustion engine.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the main part of the stern of a small boat equipped with an outboard motor according to an embodiment of the present invention, and Fig. 2 is a partial cross-section showing the main part of the connection between the control rod and a plurality of unit injectors. FIG. 2... Internal combustion IQl, 8... Unit injector,
DESCRIPTION OF SYMBOLS 11... Control rod, 46... Idle spring mounting base, 45... Lever, 47... Set screw, 49... Fixing screw, 50... Screw hole. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] 1. When assembling a multi-cylinder internal combustion engine in which a unit injector is installed in each cylinder, the fuel injection control levers of all the unit injectors are set to the respective fuel injection amount positions. 1. A combustion SI injection adjustment device for an internal combustion engine, characterized in that a control rod capable of being connected at a fuel injection amount is fixed with a jig at a fuel injection amount metering position. 2. The fuel injection amount adjusting device for an internal combustion engine according to claim 1, wherein the jig is installed in a position where the internal combustion engine cannot operate if the jig is attached.