JPH0532565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a governor device for a diesel engine.

<Prior Art> As a governor device for a diesel engine, there is a conventional governor device shown in FIG. 3. (Jitsukai 58-
(No. 172023) This is configured as follows.

Γ Basic structure The fuel injection amount adjuster 3 of the fuel injection pump 2 of a diesel engine is controlled via the governor lever 1 by a spring force to the fuel increasing side r by the governor spring 4, and by a spring force to the fuel decreasing side l by the engine rotation speed detection actuator. It is configured to be able to be controlled by an unbalanced force with the governor force.

Γ Structure to prevent generation of black smoke during sudden acceleration A unidirectional damper 8 is interposed between the governor spring 4 and the Avana lever 1, and the damper 8 buffers the rapid movement of the governor lever 7 to the fuel increase side r. On the other hand, the structure is such that the movement toward the fuel reduction side l is not buffered.

<Problems to be Solved by the Invention> The above-mentioned conventional technology is excellent in that it has the following advantages A and B, but it also has a problem C.

Γ Advantage A. Preventing the generation of black smoke when the engine suddenly accelerates In the above ``basic structure'', black smoke is generated when the engine suddenly accelerates.

That is, when the speed governor lever 21 is operated for sudden acceleration, the tension of the governor spring 4 increases rapidly and becomes much larger than the governor force of the engine rotation speed detection actuator while the engine is still rotating at a low speed. The fuel injection amount regulator 3 is excessively moved to the fuel increasing side r via the governor lever 1, and black smoke is generated in the fuel chamber due to excess fuel.

Then, as the engine speed increases from low speed rotation, the governor force increases, and the amount of excessive movement of the fuel injection amount adjuster 3 toward the fuel increase side r gradually decreases until the engine speed increases sufficiently. Black smoke continues to occur.

The above-mentioned "structure to prevent black smoke generation during sudden acceleration" is
Preventing the generation of black smoke.

That is, when the speed regulating lever 21 is operated for rapid acceleration, the tension of the governor spring 4 increases, but the damper 8 buffers the governor lever 1 from rapidly moving toward the fuel increase side r.

Therefore, the fuel injection amount adjuster 3 is gently moved toward the fuel increase side r until the engine speed increases sufficiently, so that it is not moved excessively and the generation of black smoke is prevented.

Γ Advantage B. Prevention of abnormal speed increase when engine load suddenly decreases When the engine load suddenly decreases, the engine speed increases rapidly and the governor force of the rotation speed detection actuator increases, causing the governor lever 1 to to move the fuel injection amount adjuster 3 to the fuel reduction side l.

This movement of the fuel injection amount adjuster 3 to the fuel reduction side 1 is performed quickly without being damped by the damper 8.

Therefore, an abnormal increase in engine speed due to a delay in movement is prevented.

◎Problem C. Abnormal rotation drop when the engine load suddenly increases When the engine load suddenly increases, the engine rotation speed rapidly decreases, the governor force of the rotation speed detection actuator becomes small, and the tension of the governor spring 4 increases. attempts to move the fuel injection amount regulator 3 to the fuel increasing side r via the governor lever 1.

However, due to the tension of the governor spring 4, the speed at which the governor lever 1 moves toward the fuel increase side r is
Recommended by damper 8, it becomes too slow. As a result, the increase in the amount of fuel injection is significantly delayed, and the engine speed drops abnormally. Moreover, it takes a long time to recover the rotational speed after the rotation has decreased.

The problem of the present invention is to achieve advantage A of the above-mentioned prior art: "preventing the generation of black smoke when the engine suddenly accelerates," and advantage B, "preventing abnormal speed increases when the engine load suddenly decreases."
The objective is to solve problem C, ``abnormal reduction in rotation when the engine load suddenly increases,'' while ensuring the same.

<Means for Solving the Problems> In order to solve the above problems, the present invention adds the following improved structure to the structure of the prior art, as shown in FIGS. 1 and 2, for example. It is characterized by

That is, the present invention is characterized in that an auxiliary spring 10 is interposed between the damper 8 and the governor lever 1.

<Effect> The invention works as follows.

(A) Preventing the generation of black smoke during sudden acceleration of the engine This works in the same way as described in the "Advantage A" section of the prior art above.

That is, when the speed regulating lever 21 is operated for sudden acceleration, the tension of the governor spring 4 increases, but the damper 8 dampens the rapid movement of the governor lever 1 toward the fuel increase side r.

Therefore, the fuel injection amount adjuster 3 is gently moved toward the fuel increase side r until the engine speed increases sufficiently, so that it is not moved excessively and the generation of black smoke is prevented.

(B) Prevention of abnormal speed increase when the engine load suddenly decreases This works in the same way as described in the "Advantage B" section of the prior art above.

When the engine load suddenly decreases, the engine speed increases rapidly, the governor force GF of the rotation speed detection actuator 5 increases, and the fuel injection amount regulator 3 is moved to the fuel reduction side l via the governor lever 1. move it.

This movement of the fuel injection amount adjuster 3 to the fuel reduction side 1 is performed quickly without being damped by the damper 8.

Therefore, an abnormal increase in engine speed due to a delay in movement is prevented.

(C) Prevention of abnormal rotation drop when the engine load suddenly increases When the engine load suddenly increases, the engine rotation speed rapidly decreases, the governor force GF of the rotation speed detection actuator 5 becomes small, and the governor spring 4 The tension of the auxiliary spring 10 attempts to move the fuel injection amount adjusting device 3 to the fuel increasing side r via the governor lever 1.

Due to the tension of the governor spring 4, the speed at which the governor lever 1 moves toward the fuel increase side r is controlled by the damper 8.
It gets buffered and becomes too slow.

Due to the tension of the auxiliary spring 10, the speed at which the governor lever 1 moves toward the fuel increase side r is controlled by the damper 8.
Unbuffered and fast. Therefore, the fuel injection amount is quickly increased, and the engine rotation is prevented from decreasing abnormally. Moreover, the recovery of the rotation speed after the rotation speed decreases quickly and is completed within a short period of time.

<Effects of the Invention> Since the present invention is configured and operates as described above, it has the following effects.

In other words, the damper 8 acts as a buffer to prevent (A) the generation of black smoke when the engine suddenly accelerates, and the damper 8 does not act as a buffer to prevent (B) an abnormal increase in rotation when the engine load suddenly decreases. ``(C) Prevention of abnormal rotation drop due to sudden increase in engine load'' due to the function of the auxiliary spring 10.
was able to achieve this.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional front view of the main part of the pump housing chamber of a diesel engine showing the first embodiment, and FIG.
It is a mechanical diagram of the main part of the figure.

A pump housing chamber 15 is provided on a side of the crankcase of a diesel engine E that is in contact with a gear chamber 16, and a combustion injection pump 2 is housed in the pump housing chamber 15.

A combustion injection camshaft 17 is supported below the pump housing chamber 15, and the combustion injection pump 2 is connected to the camshaft 1.
7, the centrifugal rotation speed detection actuator 5 of the engine E is attached to the tip of the injection camshaft 17 on the gear chamber 16 side.

A governor lever 1 is swingably supported in the gear chamber 16 about a fulcrum 18, and is composed of a fork lever 1a and a spring lever 1b.

The fork portion 19 at the tip of the fork lever 1a is inserted into the rack pin 6 of the injection amount adjustment rack 3 of the combustion injection pump 2, and the thrust transmission portion 12 near the base end of the fork lever 1a is interlocked with the rotation speed detection actuator 5. The fork lever 1a is configured to receive the governor force GF from the actuator 5.

Further, the tip 20 of the spring lever 1b is interlocked with the speed regulating lever 21 through an auxiliary spring 10, a unidirectional air damper 8, and a governor spring 4 in series in order, and is provided in the middle of the four lever 1a. Push the pressing pin 7 into the spring lever 1b.
It is configured so that the spring force GS of the governor spring 4 can be transmitted to the fork lever 1a by pressing into contact with the pressure receiving part 11 in the middle of the fork lever 1a.

As a result, the combustion injection amount adjustment rack 3 of the diesel engine E is configured to be controllable via the governor lever 1 by the unbalanced force between the spring force GS toward the combustion increasing side r and the governor force GF toward the combustion decreasing side l. Ru.

On the other hand, the air damper 8 is connected to the pump housing chamber 15.
A valve case 22 fixed to the upper wall 14, a piston 23 slidably fitted into the valve case 22, and a piston 23.
It consists of a ventilation hole 24 bored in the piston 2 and a valve body 25 that opens and closes the ventilation hole 24.
At the same time, the governor spring 4 is attached to the right side of the piston 23, and the governor spring 4 is attached to the right side of the piston 23.
The auxiliary springs 10 are respectively connected to the rods 27 on the left side.

Therefore, in this case, when the piston 24 slides the valve case 22 to the right, the valve body 25 closes the vent hole 24, so that when the governor spring 4 moves the injection amount adjustment rack 3 to the increasing side r. It becomes resistance.

Conversely, when the piston 24 slides the valve case 22 to the left, the valve body 25 opens the vent hole 24, so there is no sliding resistance of the piston 24, and the injection amount adjustment rack 3 can be quickly moved to the reduction side l. .

Therefore, the provision of the damper 8 can prevent the generation of black smoke when the engine E is suddenly accelerated and the abnormal increase in the engine speed when the load on the engine E is suddenly reduced. This is as explained in the section on action and effect.

However, if the load on engine E suddenly increases, the engine speed will drop and the governor force GF will drop.
decreases, and the fork lever 1a moves the injection amount adjusting rack 3 to the increasing side r by the action of the auxiliary spring 10, so that the responsiveness of the governor device can be maintained at a high level.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the main part of a governor device in a pump housing chamber of a diesel engine showing an embodiment of the present invention, FIG. It is a longitudinal sectional front view of the main part. 1...Governor lever, 2...Combustion injection pump,
3... Fuel injection amount adjustment device, 4... Governor spring, 5... Rotation speed detection actuator, 8... Damper,
10... Auxiliary spring, E... Diesel engine.

Claims (1)

[Scope of Claims] 1. The fuel injection amount adjuster 3 of the fuel injection pump 2 of the diesel engine E is controlled by a spring force applied to the fuel increase side r by the governor spring 4 via the governor lever 1, and by an engine rotation speed detection actuator. A unidirectional damper 8 is interposed between the governor spring 4 and the governor lever 1, and the damper 8 is connected to the governor lever. In a diesel engine governor device configured to buffer rapid movement to the fuel increase side r of 1, but not to buffer movement to the fuel decrease side l, between the damper 8 and the governor lever 1, A governor device for a diesel engine characterized by interposing an auxiliary spring 10.