JPH0465213B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a control system for controlling the starting fuel of an internal combustion engine in which movement of a governor spindle of a governor device is transmitted via a floating lever and a link to a control rod for controlling the fuel injection amount of the internal combustion engine. The present invention relates to a volume increasing device.

Generally, when starting a diesel engine, approximately twice as much fuel is injected as during normal operation.
Methods are being used to improve ignitability and speed of rotation after starting.

In conventional centrifugal governor devices for internal combustion engines, the movement of the governor spindle due to the centrifugal force of the governor weight is transmitted to the control rod for fuel injection amount control via floating levers, links, etc., and the internal combustion engine is automatically controlled. The speed of the engine is controlled, and a lever is provided separately from the governing or regulator handle to increase the amount of fuel when the engine is started.

However, with this type of system, the structure and operation are complicated, and at the same time, during normal operation, when the lever is pulled, the engine is operated at more than the specified horsepower, which can cause damage to the engine. There is a risk that Also, Jikko Sho 31-6209
There is also a known device in which a fuel increase device at startup is incorporated into a device for adjusting the maximum amount of fuel in a floating lever type governor, as shown in No.

On the other hand, with conventional governor devices, for example,
-The so-called torque spring method, such as No. 16205, uses a torque spring to compensate for the difference between the force of the governor weight and the force of the regulator spring, which is the main spring, and increases the injection amount when the engine speed decreases. However, in a floating lever type governor device, as in the present case, where the force of the regulator spring is also received by the first lever, and this is almost balanced with the force of the governor weight, the floating lever Since the force of the regulator spring is not transmitted to the lever side that operates the subsequent links and the control rod for controlling the fuel injection amount, such a floating lever type governor device does not require a torque spring type fuel It is not possible to employ a fuel increasing device or a fuel limiting device.

Therefore, the present invention aims to prevent the force of the regulator spring from being transmitted to the link after the floating lever and the lever side that operates the control rod for controlling the fuel injection amount, as in the above-mentioned Utility Model Publication No. 31-6209. The purpose of this invention is to automatically increase the amount of fuel only at the time of starting an internal combustion engine having a floating lever type governor device, thereby improving the starting performance of the engine.

That is, the starting fuel increase device for an internal combustion engine of the present invention includes a governor weight whose tilting angle changes depending on the engine speed, and a governor which is slidably displaced in the axial direction by receiving the tilting displacement force of the governor weight. The governor spindle in the governor position, which has a spindle, and a control rod that controls the increase/decrease of the fuel injection amount of the fuel injection device by being moved forward and backward in the axial direction are rotatably operated by a regulator lever shaft. The regulator levers are linked to each other by a floating lever whose intermediate portions are connected, and the displacement of the governor spindle of the governor device is transmitted to the control rod via the floating lever. An idle spring and a start-up increase spring for constantly biasing the front and floating levers in the direction of fuel increase are placed on the control rod side in parallel with the control rod.
When the stroke of the idle spring reaches 0, the floating lever is pulled to the increasing side, but when the rotation increases and the governor spindle moves a certain amount, the starting increase spring comes into close contact and becomes fixed. The floating lever is in contact with the spindle displacement only in the direction of increasing the amount, and the idle spring and the starting amount increasing spring always pull the floating lever in the direction of increasing the amount, and the injection amount is automatically increased when the governor force is very weak, such as at the time of starting. It is characterized by the fact that it is made to increase.

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;
Figure 2 is a side sectional view of the governor device in Figure 1 seen from the back, Figure 3 is a front sectional view in the - direction of Figure 2;
FIG. 4 is a sectional view taken in the - direction of FIG. 2.

First, in FIG. 1, an outboard motor M mounted on the stern of a small boat 1 includes an internal combustion engine 2 and an outboard motor main body 3.
The internal combustion engine 2 drives the outboard motor main body 3.
A propeller screw 4 provided at the bottom of the propeller screw 4 is rotated via a propulsion shaft 10 provided vertically therein and connected to a crankshaft 6 to propel the small boat 1 in the traveling direction of arrow A. The outboard motor M is steered by moving a steering handle 5 projecting forwardly from side to side on the boat.

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

Further, each unit injector 8 of the internal combustion engine 2 is provided with a lever for controlling the fuel injection amount fixed to a plunger (not shown), and this lever is a control rod that moves up and down parallel to the crankshaft 6. It is rotated by a fork (not shown) fixed to the door 11, and is operated as shown by arrow E to increase the fuel injection amount.

A timing belt 12 is attached to the upper part of the crankshaft 6 of this internal combustion engine 2 by this crankshaft 6.
The governor pulley 1 shown in FIG.
3 is provided, and a governor device G consisting of a governor weight support 14 rotated together with the governor pulley 13, a governor weight 16 supported by a pin 15 on the governor support 14, etc. It is rotatably provided through the.

When the governor device G rotates and the governor weight 16 opens, the centrifugal force causes the governor spindle 1 to open.
9 is pushed downward in FIG. 2, and the first lever 20 that the governor spindle 19 comes into contact with receives the pushing force. Lid member 22
The first lever 20 is rotatably supported by the first lever shaft 21 via two support members 23 attached to the Yurator spring 24
, the force of the governor weight 16 via the governor spindle 19 and the load of the regulator spring 24 are balanced.

Next, one end of the floating lever 26 comes into contact with a stopper 25 provided on the back side of the contact part of the first lever 20 with the governor spindle 19, and the other end of the floating lever 26 It is connected to a lever 28 in FIG. 2 via a link 27.

This lever 28 is connected via a pin 30 to the control rod 11 that increases or decreases the amount of the unit injector 8.
8 is constantly pulled by the idle spring 29 in the direction of increasing fuel as indicated by the arrow E, and as a result, the floating lever 26 is constantly working in the direction of pressing the first lever 20.

Therefore, depending on the force balance between the governor spindle 19 and the regulator spring 24, the first
The lever 20 will move in balance,
In accordance with this movement, the floating lever 26 also moves, and the control rod 11 also moves together.

In addition, at this time, the force of the idle spring 29 is
Since the force is smaller than the force of the regulator spring 24, most of the force generated by the centrifugal force of the governor weight 16 is received by the regulator spring 24.

On the other hand, the pin 31 that is the fulcrum of the floating lever 26 is provided on the regulator lever 32 shown in FIG.
By rotating around the regulator lever shaft 33, the position of the pin 31, which is the fulcrum of the floating lever 26, can be changed. It is possible to adjust the increase or decrease of fuel in the regulator lever shaft 33.
is also incorporated into the governor lid member 22 as shown in FIG.

In the floating lever type governor device G in the above embodiment, in the conventional governor device,
By locating the regulator spring 24 around the governor weight 16 in a place other than around the governor weight 16, the structure around the governor weight 16 is simplified and compact, and the height of the governor device G is reduced. By being able to lower the height of the internal combustion engine 2 in the direction of the crankshaft 6, it is possible to lower the height of the internal combustion engine 2 in the direction of the crankshaft 6, and also to lower the mounting position of the flywheel 34 above the crankshaft 6 shown in FIG.

Further, as in the above embodiment, in the floating lever type governor device G, the first lever 2
0, and most of the force is received only by this first lever 20, and the structure is also characterized in that the force is not transmitted to other links 27 etc. .

Next, to explain the operation of the floating lever type governor device G, the governor spindle 19 lifts as the internal combustion engine 2 rotates, but when the engine is started, the first lever 20 and the regulator spring 24 are 3 shown in Figure 3.
There is a gap H on the order of mm, and during this gap H, the force of the governor weight and the idle spring are in balance, performing governing during idling rotation. It is only when the rotation further increases and the force of the governor weight becomes even greater that the regulator spring becomes effective via the first lever.

On the other hand, this regulator spring 24 has
A certain mounting load is applied, and the regulator spring 24 does not move at all until the internal combustion engine 2 reaches a certain rotation and the governor force reaches a certain level of force, and during that time, the floating lever 26 also does not move. , it is a so-called min max governor in which no governing is performed.

Therefore, when the internal combustion engine 2 further exceeds a certain rotation speed, the governor force becomes larger than the mounting load of the regulator spring, the governor spindle 19 lifts, the regulator spring 24 begins to retract, and the floating lever 26 and control rod 1 via link 27 and lever 28.
1 acts on the side of fuel reduction, thereby suppressing the maximum rotational speed of the internal combustion engine 2.

Next, in the idling state, the spring 24 is not moving, and while the power balance is exchanged between the idle spring 29 and the governor force, when the rotation speed drops further, the injection amount increases and the rotation speed increases. Then, the injection amount is reduced and the idle spring 29 is given a spring constant that makes it possible to maintain the idle rotation speed.

However, since there is friction in the link system consisting of the lever 28, link 27, floating lever 26, etc., in order to overcome this friction and operate, this spring constant must have a certain degree of strength, otherwise the above-mentioned idle Since the condition becomes unstable, the idle spring 29 needs to have a spring constant that takes this point into consideration.

Furthermore, since the governor force during idling is very small, the amount by which the idle spring 29 contracts is inevitably small when the internal combustion engine 2 is stopped, that is, when the engine is started. Therefore, in the present invention, as shown in FIG. 2, a starting increase spring 4 with a small spring constant is added to the idle spring 29.
0 are connected in series via a hook 41 and an adjuster 42.

The mounting load of the start-up increase spring 40, when in contact with the idle spring mounting base 43 of the adjuster 42, is smaller than the sum of the weight of the governor force during idling and the weight of the link system, and is smaller than the weight of the link system. shall be set to a large value.

Therefore, when the internal combustion engine 2 rotates above idling, the adjuster 42 comes into contact with the idle spring mounting base 43 and no longer functions as a spring. It will act with its own spring constant.

On the other hand, when the engine is stopped, this starting increasing spring 4
0 covers a small amount of contraction of the idle spring 29, and the control rod 11 is operated in the fuel increase direction E until it comes into contact with the idle spring mounting base 43. Therefore, the control rod 11 reaches the maximum fuel injection amount position. As a result, the engine can be started quickly and reliably.

As described above, the starting fuel increase spring device that can pull up the control load 11 to the maximum fuel increase position via the idle spring 29 only when the internal combustion engine 2 is stopped is the starting fuel increase spring 40 and the hook 41 in the above embodiment. , the adjuster 42, the idle spring mounting base 43, etc., but any structure is effective.

Therefore, the starting fuel increase device of the present invention is a floating lever type in which the force of the regulator spring is not transmitted to the link after the floating lever and the lever side that operates the control load for controlling the fuel injection amount. If applied to an internal combustion engine having a governor device, the amount of fuel can be automatically increased only when the engine is started, and the engine can be started quickly and reliably, improving the engine's starting performance. can.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the stern main part of a small boat equipped with an outboard motor according to an embodiment of the present invention;
3 is a side sectional view of the governor device shown in FIG. 1 viewed from the back side, FIG. 3 is a front sectional view taken in the - direction of FIG. 2, and FIG. 4 is a sectional view taken in the - direction of FIG. 2. DESCRIPTION OF SYMBOLS 1... Internal combustion engine, 11... Control rod, 16... Governor weight, 19... Governor spindle, 20... First lever, 24... Regulator spring, 26... Floating lever, 27... Link, 28... Lever, 29...
Idle spring, 40...starting increase spring,
41...Futsuku, 42...Asiasutha, 43...
Idle spring mounting base, E...Fuel increase direction.

Claims (1)

[Claims] 1. A governor having governor weights 16, 16 whose tilting angle changes according to the engine speed, and a governor spindle 19 which is slidably displaced in the axial direction in response to the tilting displacement force of the governor weights 16, 16. Said governor spindle 19 of device G
and a control rod 11 that controls the increase/decrease of the fuel injection amount of the fuel injection device 8 by being moved forward and backward in the axial direction.The regulator lever 3 is rotatably operated by a regulator lever shaft 33.
2 and 2 are interconnected by a floating lever 26 whose intermediate portion is connected, and the displacement of the governor spindle 19 of the governor device G is transmitted to the control rod 11 via the floating lever 26, and the control Rod 1
1 and the floating lever 26 in the direction of fuel increase at all times.
Installed in parallel and in series with the control rod on the side,
When the stroke of the idle spring 29 becomes 0, the floating lever 26
However, when the rotation increases and the governor spindle 19 moves a certain amount, the increase spring 40 comes into close contact and is fixed at startup, and the floating lever 26 contacts the spindle displacement only in the direction of increase, and when the idle Spring 29 and starting increase spring 4
0 always pulls a floating lever 26 in the fuel increasing direction to automatically increase the injection amount when the governor force at the time of starting is very weak.