JPH0427374B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for adjusting a governor device attached to an internal combustion engine, and in particular, a method for adjusting a governor device attached to an internal combustion engine, in particular, a method for adjusting a governor device that is attached to an internal combustion engine. This invention relates to a method for readjusting a governor device equipped with a starting fuel increase spring when the engine is stopped and without a dynamometer.

(Prior Art) Internal combustion engines used as power sources for diesel engines or generators installed in construction machinery, agricultural machinery, etc. are generally required to have a constant rotational speed regardless of load fluctuations. from,
A governor device is provided to adjust the amount of fuel injected by moving the control rack position of the fuel injection pump in accordance with the engine speed, thereby keeping the engine speed constant.

An example of a governor device attached to this type of conventional internal combustion engine will be explained based on FIG. In the fuel injection pump 3, the fuel injection timing is set by a cam 4, and the injection amount is determined by the left and right positions of a rack pin 6 protruding from a control rack 5. The governor lever 8 is engaged with a slit 9 at the upper end of the governor lever 8 which is oscillated as a center, and the governor lever 8 is brought into contact with a tension lever 11 provided coaxially with the governor lever 8 through a pin 10 provided in the middle thereof. The arrow of the sleeve 14 is attached in the fuel increasing direction by the tension lever 11, and is generated by the governor weight 13 according to the rotation speed of the engine by the force receiving pin 12 provided at the lower end 11a. It is configured to receive thrust in the X direction. Further, the end portion 1 of the tension lever 11
The governor spring 15 whose one end is attached to 1b is
The other end is engaged with the tip of a spring lever 17 that is integral with the control lever shaft 16 that is rotatably inserted into the governor casing 1, and the control lever 18 is fixed to the outwardly projecting end of the control lever shaft 16. By rotating the tension lever 11, the biasing force of the tension lever 11 in the direction of fuel increase, that is, in the direction of arrow Y can be adjusted.

This governor device has a hole 19 formed in the lower end 11a of the tension lever 11 for the purpose of supercharging the fuel by biasing the governor lever 8 in the fuel increasing direction when starting the engine and smoothing the start. , a starting fuel increase spring 20 whose spring force is much smaller than that of the governor spring 15, which urges the lower end 8a of the governor lever 8 in the direction of arrow Z, that is, in the fuel increase direction.
is housed there.

In the figure, 21 is the end 11 of the tension lever 11.
c to restrict excessive rotation of the lever 11,
A fuel limit bolt 22 is a stopper that limits the rotation angle of the spring lever 17 and is used to set the horsepower of the engine. (For example, refer to Japanese Utility Model Publication No. 52-57292, etc.) In an internal combustion engine equipped with a conventional governor device as described above, normally, when adjusting the fuel restriction bolt 21 to set horsepower (fuel restriction), , while connecting a dynamometer to the engine output shaft and reading the instrument,
The screwing amount of the limit bolt 21 is adjusted, and when the target horsepower is shown, the limit bolt 21 is fixed and the governor device is adjusted.

(Problem to be Solved by the Invention) However, the above-mentioned adjustment work of the governor device is normally performed precisely using a dynamometer in the manufacturer's factory before the engine is shipped, but when it is delivered to the user's hands. If it is necessary to replace the fuel injection pump 3 or readjust the governor device at an outdoor location after the fuel injection pump 3 has been used, it is practically impossible to prepare a dynamometer each time, and the governor device structure, that is, governor lever 8 and tension lever 1
A starting fuel increase spring 20 is interposed between the governor lever 8 and the
Since the phase of is progressing toward the fuel increase side, the limit bolt 2 is
1 and the tension lever 11, it became difficult to find an appropriate contact position between the tension lever 11 and the tension lever 11, and there was a problem that it became impossible to set an accurate specified output again.

The present invention focuses on the problem of the difficulty of readjustment work in the conventional governor device equipped with the starting fuel increase spring, and the present invention has been developed by holding the governor lever and the tension lever together, and by interposing the starting fuel amount between the two levers. By virtually eliminating the biasing force of the fuel increase spring and adjusting the limit bolt while maintaining the relative position of both levers in the normal operating state with the pump set in the engine, the governor lever The purpose is to correct the phase shift between the tension lever and the tension lever, and thereby accurately set the engine's horsepower.

(Means for Solving the Problems) A feature of the present invention for achieving the above object is that the governor spring is rotatably biased in the fuel increasing direction;
Also, between the tension lever whose rotation in the same direction is restricted at the position where it contacts the fuel restriction bolt, and the governor lever which changes the control rack position of the fuel injection pump in conjunction with the governor weight,
In an internal combustion engine equipped with a governor device including a starting fuel increase spring that biases the governor lever in the fuel increase direction, when setting the horsepower with the engine stopped, the governor lever and the tension lever are integrated. The fuel limiting bolt and the tension lever are held in a positional relationship during normal operation against the starting fuel increase spring, and in this state, the control rack of the fuel injection pump is in a position corresponding to a predetermined injection amount. The point is to adjust the contact position of the

That is, the present invention aims to eliminate play between the tension lever, governor lever, and restriction bolt, and to accurately align the positional relationship of each lever so that the control rack of the fuel injection pump stops at a position corresponding to the specified injection amount. Furthermore, maintaining the governor lever and tension lever in the normal operating state against the starting fuel increase spring effectively eliminates the biasing force of the spring and causes the governor lever and tension lever to engage. Means for this include temporary clamping with a jig or fixing with screws. According to the present invention, the fuel injection amount can be set at a prescribed position without removing the fuel pump and governor device from the engine.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows an embodiment of horsepower setting according to the method of the present invention, and the target governor device has exactly the same structure as that shown in FIG. The parts with the same reference numerals as those used in 2 indicate the same members and the same parts, and the movement of each lever during normal operation is also exactly the same.

Reference numeral 23 denotes a jig for carrying out the method of the present invention, which is inserted through an adjustment hole 24 provided in the governor case 1. A U-shaped bent portion 25 that holds the lower end 8a of the governor lever 8 at its tip.
A grip part is formed at the rear end and a central part 26 is joined by means such as welding, and an abutting part 27 is formed by bending upward from the central part 26.
is adapted to come into contact with the back surface of the lower end 11a of the tension lever 11.

The distance 1 between the U-shaped bent portion 25 and the contact portion 27 is determined by compressing the starting fuel increasing spring 20 housed in the hole 19 of the tension lever 11 so that the lower end 8a of the governor lever 8 is
When brought into contact with the lower end 11a of the lever 1, the width is set such that the biasing force of the starting fuel increase spring 20 is substantially eliminated and both levers 8, 11 can be maintained in the positional relationship during normal operation.

Next, a case will be described in which the method of the present invention is implemented using the above-mentioned adjustment jig 23. If you want to readjust the governor device by removing the fuel injection pump 2 from the governor case 1 and installing another fuel injection pump 2, first remove the lid 28 from the governor case 1 and open the adjustment window while the engine is stopped. 21
Insert the jig 23 into the governor case 1 through the
While fitting the U-shaped bent portion 25 at the tip of the jig 23 onto the lower end 8a of the governor lever 8, and pressing the tension lever 11 against the governor lever 8 against the starting fuel increase spring 20, the jig 23 is brought into contact with the jig 23. The governor lever 8 and the tension lever 11 are held in a clamped state by pressing the portion 27 against the back surface of the lower end 11a of the tension lever 11.

At this time, the pin 10 provided at the intermediate portion of the governor lever 8 engages with the tension lever 11, and the governor lever 8 is in a positional relationship during normal operation, and is in a state where it can rotate together with the tension lever 11. Therefore, the control lever 18 is rotated in the speed increasing direction,
While increasing the biasing force of the governor spring 15 to bring the tension lever 11 into contact with the fuel restriction bolt 21, adjust the screwing amount of the fuel restriction bolt 21, and move the rack pin 6 fitted into the slit 9 of the governor lever 8. The rack mark 29 engraved on the control rack 5 is aligned with the fuel pump reference surface 30.
When they match, the contact position between the fuel restriction bolt 21 and the tension lever 11 is set.

After setting the horsepower of the fuel injection pump 3 in this way, the jig 23 is removed, the fuel increase spring 20 is returned to its original position, and the adjustment window 2 is closed with the lid 28.
4 is closed, the governor device equipped with the fuel increase spring 20 can be operated in a normal state, and the engine can be started smoothly and the speed can be controlled.

FIGS. 2 and 3 show other embodiments for adjusting the governor device according to the method of the present invention, in which parts denoted by the same reference numerals as in FIGS. 1 and 6 are the same members, respectively. Although it shows the part,
In the governor device of this embodiment, the upper end 8b of the governor lever 8 and the rack pin 6 of the fuel injection pump 3 are connected to each other because the fuel injection pump 3 is removably attached to the pump case 1' which is fixed integrally with the governor case 1. They are connected via horizontal links 31.

Further, at the lower end 11a of the tension lever 11, a hole 1 for accommodating a starting fuel increase spring 20 is provided.
9 has a screw insertion hole 32 coaxially with the hole 19.
At the same time, a screw hole 34 is bored at the lower end 8a of the governor lever 8 corresponding to the screw insertion hole 32, into which the tip of the screw 33 inserted through the screw insertion hole 32 can be screwed. has been done.

In the figure, reference numeral 35 denotes an adjustment window hole provided at a position facing the rack side of the fuel injection pump 3 of the pump case 1'.

Further, 36 is a governor weight support.
Another example of this governor weight support 36 is the fourth
As shown in the drawings and FIG. 5, two supports 37, 37' made of a press and formed separately are used, and both are positioned at a predetermined angle with a pin 38 and fixed by caulking or the like. As a result, four governor weights (not shown) can be attached, and the speed regulating performance for low-speed rotation specifications can be satisfied. Note that the support may be formed by stacking three or more pressed products.

When readjusting the governor device having the above configuration using the method of the present invention, first remove the lid 28 of the governor case 1 to open the adjustment window 24, and insert the screw 33 into the screw insertion hole 32 of the lower end 11a of the tension lever 11. Then, the lower end 8a of the governor lever 8 is brought into contact with the lower end 11a of the tension lever 11 against the starting fuel increase spring 20, and the screw 33 is rotated with a tool such as a screwdriver, so that the tip of the screw 33 is inserted into the governor lever 8.
It screws into the screw hole 34 on the side and holds both levers 8 and 11 together.

At this time, the governor lever 8 and the tension lever 11 are engaged with each other via the pin 10, and are in a state in which they can rotate together around the support shaft 7 in the positional relationship during normal operation. .

Next, the control lever 18 is rotated in the speed increasing direction to increase the biasing force of the governor spring 15, and the governor lever 8 and the tension lever 11 are
While visually checking the rack mark 29 provided on the control rack 5 of the fuel injection pump 3 through the adjustment window hole 35, adjust the fuel restriction bolt 21 so that the rack mark 29 matches the fuel pump reference surface 30. Adjust the amount of screw insertion.

After completing the horsepower setting, remove the screw 33 at the lower end of the tension lever 11, and
By restoring the starting fuel increase spring 20 and closing the adjustment window 24 of the governor case 1 with the lid 28, a normal governor action is achieved, and the engine starts smoothly due to the action of the starting fuel increase spring 20.

(Effects of the Invention) As described above, the adjustment method of the present invention, when setting the horsepower of an internal combustion engine with the engine stopped, integrates the governor lever and tension lever of the governor device and interposes them between the two levers. The tension lever and the tension lever are held in the positional relationship during normal operation against the starting fuel increase spring, and in this state, the control rack of the fuel injection pump is in a position corresponding to the predetermined injection amount. After adjusting the contact position with the fuel limiting bolt that limits the rotation angle in the fuel increasing direction and setting the horsepower while substantially eliminating the biasing force of the starting fuel increasing spring, the starting fuel increasing spring The system resets the fuel injection pump and readjusts the governor device, so even if the fuel injection pump and governor are separate, the fuel injection amount can be adjusted to the specified position without removing the fuel injection pump and governor from the engine. In addition, even if the fuel injection pump is replaced during engine use, there is no need to prepare a separate dynamometer, and fuel injection can be performed while maintaining the positional relationship between the governor lever and tension lever during normal operation. It is possible to easily and quickly find the appropriate contact position between the fuel limit bolt and tension lever that is compatible with the pump, and after setting the horsepower, the starting fuel increase spring is applied to smooth the engine start. This has the excellent effect of achieving high efficiency in the readjustment work of a governor device equipped with a starting fuel increase spring.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a governor device that can be adjusted by the method of the present invention, FIG. 2 is a side sectional view of a governor device including a configuration for carrying out the method of the present invention, and FIG. 3 is a direction A in FIG. 2. 4 is a front view showing another example of the governor weight support applicable to the governor device, and FIG.
It is a sectional view taken along the line. Moreover, FIG. 6 is a sectional view showing an example of a conventional governor device. 3...Fuel injection pump, 5...Control rack, 8...Governor lever, 11...Tension lever, 13...Governor weight, 15...Governor spring, 20...Starting fuel increase spring, 21...Fuel restriction Bolt, 23, 33... Lever holding means.

Claims (1)

[Claims] 1. A tension lever that is biased to rotate in the fuel increasing direction by the governor spring and whose rotation in the same direction is restricted at the position where it contacts the fuel restriction bolt, and a fuel injection pump control that is linked to the governor weight. In an internal combustion engine equipped with a governor device that includes a starting fuel increase spring that biases the governor lever in the fuel increase direction between the governor lever that changes the easy position, the horsepower setting is performed while the engine is stopped. At this time, the governor lever and the tension lever are integrated and held in the positional relationship during normal operation against the starting fuel increase spring, and under this condition, the control rack of the fuel injection pump is moved to a position corresponding to the predetermined injection amount. A method for adjusting a governor device for an internal combustion engine, comprising adjusting a contact position between the fuel restriction bolt and a tension lever so that the following is achieved.