JPH064043Y2 - Governor device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a governor device for an internal combustion engine equipped with a governor lever that is urged by a governor spring toward the fuel increase side and has one end abutting against a governor sleeve.

(Prior Art and Problems Thereof) In this type of conventional governor device, as shown in FIG. 5, a governor lever 15 is directly connected to a fuel increasing / decreasing control rack 28. Therefore, it is not possible to arbitrarily increase or decrease the fuel at a desired number of revolutions regardless of the rotation of the governor lever 15. Therefore, for example, generation of black smoke due to excessive fuel in the low speed revolution region during deceleration or fuel shortage during sudden acceleration. There is a risk of Particularly in diesel engines equipped with a supercharger, the phenomenon of excessive fuel in the low speed rotation range is remarkable.

(Object of the Invention) An object of the present invention is to provide a governor device capable of arbitrarily increasing and decreasing the fuel injection amount regardless of the rotation of the governor lever in a desired rotational speed range or the like.

(Means for Achieving the Purpose) In order to achieve the above-mentioned object, the present invention rotatably supports a governor lever on a governor lever shaft and urges a governor spring toward a fuel increasing side, so that one end of the governor lever has a governor sleeve. A sub-lever shaft is provided on the governor lever portion spaced from the governor lever shaft, the sub-lever is rotatably supported via the sub-lever shaft, and one end of the sub-lever is pivotally connected to the fuel increase / decrease control rack. , The other end is pivotally connected to the rod portion of the electromagnetic solenoid, and when the governor lever is rotated, the sub-lever rotates about the pivotal portion with the rod portion, and when the solenoid is operated, the sub-lever rotates around the sub-lever shaft. I am trying.

(Embodiment) In FIG. 1 showing a governor device of a diesel engine to which the present invention is applied, a governor case 5 is fixed to a fuel injection pump case 1, and a solenoid chamber 7 is provided at a front lower end portion thereof. A fuel injection pump 2 and a cam shaft 3 extending in the front-rear direction are arranged in the fuel injection pump case 1, the cam shaft 3 projects into the governor case 5, and the fuel increase / decrease control rack 28 of the fuel injection pump 2 is also governor case 5. It extends inward.

A governor sleeve 6 is fitted to the front end of the camshaft 3 so as to be movable in the front-rear direction, and a governor weight 8 is in contact with the rear end surface of the governor sleeve 6. Governor weight 8 is pin 10
Is rotatably supported by the boulder 9 via the holder 9
Is fixed to the cam shaft 3. That is, the governor weight 8 is configured to push the governor sleeve 6 forward by expanding around the pin 10.

A governor lever shaft 12 extending in the left-right direction is arranged above and in front of the governor sleeve 6, and is fixed to the governor case 5. The governor lever 15 is rotatably supported by the governor lever shaft 12 and integrally includes a force receiving arm portion 16 extending downward and a rear arm portion 17 extending rearward and upward. The lower end portion of the force receiving arm portion 16 has a governor sleeve 6
The rear end of the rear arm 17 via the governor spring 18 and the regulator lever 2 on the front upper side.
The governor lever 15 is biased toward the fuel increase side (arrow A side) by the tension of the governor spring 18.
The regulator lever 20 is fixed to a regulator shaft 22 which is parallel to the governor lever shaft 12, and the regulator shaft 22 is rotatably supported by the governor case 5 and extends outside the governor case, and a control handle 21 is integrated at the outer end thereof. Prepared for.

The sub-lever shaft 26, which is parallel to the governor lever shaft 12, includes a governor lever 1 that is spaced upward from the governor lever shaft 12.
It is provided in the 5th part, and the sub lever 25 is attached to the sub lever shaft 26.
Is rotatably supported. The sub-lever 25 extends substantially in the vertical direction, the upper portion is short, the tip end thereof is pivotally connected to the front end portion of the control rack 28 via the pin 24, and the lower portion is long and extends to the solenoid chamber 7. At the lower end edge of the sub-lever 25, a long groove 35 having a lower end opening shape that is long in the vertical direction is formed. An electromagnetic solenoid 31 is screwed to the front portion of the solenoid chamber 7, and a moving rod portion 32 thereof is provided integrally with a pivot pin 36 extending rearward and parallel to the governor lever shaft 12 and attached to the pivot pin 36. The long groove 35 of the sub-lever 25 is rotatably engaged. A stopper bolt 34 is screwed into the rear wall of the solenoid chamber 7. The stopper bolt 34 faces the rear end edge of the rod portion 32 and adjusts the maximum protrusion amount of the rod portion 32. It should be noted that in FIG.
Shows a state in which is pulled forward.

A fuel limiter 37 is screwed onto the upper part of the front wall of the governor case 5, and a rod portion 38 of the fuel limiter 37 is biased rearward by a spring 39 to face the upper front end edge of the governor lever 15 from the front.

The electromagnetic solenoid 31 is connected to an electromagnetic pickup 42 via a changeover switch 43 as shown in FIG. 2, for example, and the electromagnetic pickup 42 is arranged so as to face the ring gear 41 of the crankshaft 40, and the rotational speed changeover switch 4 is used.
Enter in 3. The changeover switch 43 sets the electromagnetic solenoid 31 to the energized state to pull the rod portion 32 forward when the rotational speed is lower than the desired set rotational speed, and sets the electromagnetic solenoid 31 to the emergency energized state when the rotational speed is higher than the set rotational speed. The part 32 is configured to project rearward.

As the set rotational speed, for example, the rotational speed N1 shown in FIG. 4 is adopted. That is, in FIG. 4, the solid line graph shows the change in the smoke concentration by the conventional device without the sub-lever, and the rotation speed is slightly higher than the rotation speed N1 'at the intersection of the solid line graph and the black smoke generation limit line L. The number N1 is set as the rotational speed.

(Operation) When the rotation speed is higher than the rotation speed N1 shown in FIG. 4, the rod portion 32 shown in FIG. 1 is pushed out rearward, and in this state, the governor lever 15 operates as usual. For example, when the number of revolutions increases from the rated number of revolutions due to a decrease in the load, the governor weight 8 expands, and the governor sleeve 6 pushes the force receiving arm portion 16 forward against the governor spring 18.
The upper end of the sub-lever 25 moves toward the fuel reduction side with the pivot pin 36 at the lower end as the center of rotation, whereby the control rack 28 moves to the fuel reduction side. On the contrary, when the number of rotations decreases, the force receiving arm portion 16 returns to the rearward direction, and the sub-lever 25 moves the upper end portion toward the fuel increase side around the pivotal support pin 36 at the lower end as a rotation center, whereby the control rack. Moves to the fuel increase side.

When the number of rotations becomes equal to or lower than N1 in FIG. 4 as during idling, the electromagnetic solenoid 31 is energized and the rod portion 32 is pulled forward as shown in FIG. As a result, only the sub-lever 25 rotates clockwise with respect to the governor lever 15 with the sub-lever shaft 26 as the center of rotation, and the control rack 28 rotates to the fuel decrease side to regulate the increase of the fuel injection amount. The generation of black smoke is prevented as shown by the phantom line graph.

(Other Embodiment) Although the illustrated embodiment is an example in which the fuel injection amount is reduced by rotating the sub-lever at a desired rotation speed, the fuel injection amount is increased at a desired timing or rotation speed. It can also be configured as follows. For example, as shown in FIG. 3, a changeover switch 46 is arranged so as to face the accelerator pedal 45 of the tractor, and as the electromagnetic solenoid 31, the rod portion 32 projects rearward when energized to rotate the sub-lever 25 to the fuel increase side. Set to. Therefore, when the accelerator pedal 45 comes into contact with the switch 46 at the time of sudden acceleration, the rod portion 32 of the electromagnetic solenoid 31 projects rearward to rotate the sub-lever 25 to the fuel increase side, temporarily increase the fuel amount, and improve the acceleration performance. Let

(Effects of the Invention) As described above, according to the present invention, the sub-lever shaft 26 is provided in the governor lever portion spaced from the governor lever shaft 12, and the sub-lever 25 is rotatably supported via the sub-lever shaft 26. One end is pivotally connected to the fuel increase / decrease control rack 28, and the other end is pivotally connected to the rod portion 32 of the electromagnetic solenoid 31. When the governor lever is rotated, the sub-lever 25 is pivotally connected to the rod portion 32. Since the sub-lever 25 is rotated about the sub-lever axis when the solenoid is operated, it has the following advantages.

(1) The sub-lever 25 can be rotated regardless of the rotation of the governor lever 15 at a desired rotation speed or timing to arbitrarily increase or decrease the fuel amount.

Therefore, for example, in a diesel engine with a supercharger, it is possible to prevent generation of black smoke due to excess fuel by controlling the fuel injection amount in a low speed rotation range such as during deceleration or idling rotation. Further, the acceleration performance can be improved by increasing the amount of fuel by the sub-lever during sudden acceleration.

(2) Since the sub-lever 25 is operated by the electromagnetic solenoid 31, it is possible to reliably change the fuel injection amount at any desired rotational speed, etc., as compared with, for example, a device using a conventional Angleich spring or the like. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a governor device to which the present invention is applied, and FIG.
FIG. 4 is a schematic wiring diagram of an electromagnetic solenoid, FIG. 3 is a schematic wiring diagram of an electromagnetic solenoid of another embodiment, FIG. 4 is a graph of exhaust gas concentration, and FIG. 5 is a vertical sectional view of a conventional example. 6 ... Governor sleeve, 12 ... Governor lever shaft, 15 ... Governor lever, 1
8 ... Governor spring, 25 ... Sub lever, 26 ... Sub lever shaft, 28 ... Fuel increase / decrease control rack, 31
… Electromagnetic solenoid, 32… Rod part

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A governor lever is rotatably supported by a governor lever shaft, and is urged by a governor spring toward a fuel increasing side. A sub-lever shaft is provided, the sub-lever is rotatably supported via the sub-lever shaft, one end of the sub-lever is pivotally connected to the fuel increase / decrease control rack, and the other end is pivotally connected to the rod portion of the electromagnetic solenoid. The governor device for an internal combustion engine, wherein when the governor lever is rotated, the sub-lever is rotated about a pivotal connection portion with the rod portion, and when the solenoid is operated, the sub-lever is rotated around the sub-lever shaft.