JPH0138268Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a fuel injection amount limiting device for a diesel engine.

≪Basic structure≫ Fig. 1 is a cross-sectional plan view of the main parts of the governor device G of a horizontal water-cooled diesel engine. A well-known centrifugal governor 4 is fixed to the front end surface of the gear 3.

The governor force F generated by the governor 4 is transmitted to the governor lever 5, and the fuel injection pump 6 is placed at the tip of the governor lever 5.
The rack pin 7 is pushed in the fuel decreasing direction S against the governor spring 8 which presses the rack pin 7 in the fuel increasing direction M.
oscillate. Then, the governor lever 5 stops when the governor force F and the tension of the governor spring 8 set by the speed regulating lever 9 are balanced, and the fuel injection amount is adjusted to match the rotation, thereby setting the engine rotation speed. The current value is maintained at an approximately constant value.

In the governor device G having the above configuration, a control device 10 is attached to the gear case 11 to suppress excessive movement of the governor lever 5 in the fuel increase direction M due to overload and low speed rotation.

<<Prior Art>> Conventionally, as shown in FIG. 4, this restricting device 10 has a pin-shaped restricting device 13 that is attached to a cylindrical case 12 that is screwed and fixed to a gear case 11 so as to be able to move forward and backward. By applying compression to the cylindrical case 12 at an early stage and urging it in the advancing direction by the internal fuel limiting spring 14, and by catching the contact portion 15 of the governor lever 5 with this limiting device 13, high load rotation is reduced. In addition, when the rotation decreases due to a further increase in load, the governor lever 5 is moved in the fuel increasing direction M against the fuel limit spring 14.
By gradually moving the engine, the engine's torque is increased and engine stoppage is prevented.

However, in the above-mentioned conventional configuration, the fuel limiting spring 14 acts on the governor lever 5 even when starting the engine, so there is a problem in that the amount of fuel for starting cannot be increased sufficiently, making starting difficult. If this spring 14 is set weakly to make it easier to increase the amount of starting fuel, excessive fuel will be supplied even during normal operation, resulting in irregular combustion.

For this reason, Japanese Utility Model Publication No. 54-163224 (prior art A) and Publication of Utility Model Publication No. 52-44738 (prior art B)
The device shown in is proposed.

Prior Art A This is to suppress excessive movement of the control rack of a fuel injection pump in the direction of fuel increase.The control rack is configured so that the excess movement is caught by a fuel restriction spring via a restriction device, and a fuel restriction spring is configured to catch the excessive movement through a restriction device. A limiter receiving position switching means is disposed on the holder, and when starting (at room temperature), the stopper pin of the limiter receiving position switching means is moved backward by pushing the increase handle, thereby reducing the amount of backward movement of the limiter. It's getting bigger.

Prior art B The governor device is configured so that excessive movement of the fork lever in the direction of fuel increase is caught by a fuel limiting spring via a restricting device, and the cylinder case is positioned behind the cylinder case into which the restricting device and the fuel restricting spring are inserted. (at room temperature)
At the time of starting, the stopper device of the cylindrical case positioning means is moved backward in conjunction with the decompression operation of the decompression device, thereby reducing the amount of protrusion of the cylindrical case.

<<Problem to be solved by the invention>> However, prior art A and prior art B have the following drawbacks.

B. When starting the engine at room temperature, the conventional technology A requires pushing the fuel increase handle, and the conventional technology B requires operating the decompression device, which necessitates a starting operation.

(b) During a cold start, where starting is difficult even with the above-mentioned fuel increase, starting cannot be performed using conventional techniques A and B.

The object of the present invention is to provide a system that requires no operation when starting an engine at room temperature, and enables strong cold starting.

<<Means for Solving the Problem>> In order to achieve the above object, the present invention provides a fuel injection pump 6 as shown in FIGS. 2 and 3, for example.
Excessive movement of the governor lever 5 in the fuel increase direction M in the governor device G that controls the fuel injection amount of
The restriction device 13 is configured to be received by the fuel restriction spring 18 via the restriction device 13, and the restriction device 13 and the fuel restriction spring 18 are inserted into the movable cylinder frame 16, and the restriction device 1 is received by the fuel restriction spring 18.
3 protrudes outside the front end of the movable cylindrical frame 16, and the fuel restriction spring 18
A spring receiver 17 fixed to the rear of the movable cylinder frame 16 receives the fuel limiting spring 18, and a starting spring 19 is disposed at the rear of the movable cylinder frame 16. 16 is configured so that the backward movement of the starting spring 19 is received by the starting spring 19, and a spring receiving position switching means D is disposed behind the starting spring 19 so that the receiving position of the starting spring 19 can be switched. , the biasing force of the starting spring 19 is set to be stronger than the biasing force of the fuel limiting spring 18, and the spring receiving position switching means D consists of a spring receiving member 20 and locking means 22, 23, and the spring receiving member 20 is It is configured to move forward and backward in the direction of compression and relaxation of the starting spring 19, and the spring receiving member 20 can be locked and fixed at the position where the starting spring 19 is advanced toward the compression side using the locking means 22 and 23. By releasing the locking and fixing of the means 22 and 23, the spring receiving member 20 can be moved to a position where the starting spring 19 is retracted to the relaxed side.

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

Embodiments of the present invention are shown in FIGS. 2 to 4.

In this embodiment, a movable cylinder frame 1 is attached to the front end of a cylinder case 12 screwed and fixed to a gear case 11.
6 is fitted inside so that it can move back and forth, and this movable cylinder frame 1
A stepped pin-shaped limiter 13, which is non-removably equipped at 6, protrudes from the front end of the cylindrical case 12.

A fuel limiting spring 18 supported by an adjustable spring receiver 17 is initially compressed and assembled into the movable cylinder frame 16, and the limiting device 13 is biased in the projecting direction.

Further, the movable cylinder frame 16 itself is supported by a starting spring 19 built into the cylinder case 12 and is urged to the forward limit. A spring receiving member 20 supporting the starting spring 19 is fitted into the rear end of the cylindrical case 12 so as to be able to move forward and backward and rotate freely, and is prevented from coming out by a cover 21 after being attached to the cylindrical case 12.

Engaging protrusions 22, 22 are implanted at diagonal positions on the outer circumference of the spring receiving member 20, and a pair of slits 23, 23 are provided in the cylindrical case 12 in the axial direction of the case. is formed. The front end of each slit 23 is bent in the circumferential direction, and after the spring receiving member 20 is pushed in against the starting spring 19, it is rotated to push the protrusions 22, 22 into the slits 23, 23.
The starting spring 19 can be supported in a compressed state by engaging with the bent portion at the rear end of the starting spring 19 . The starting spring 19 is set to be stronger than the fuel limiting spring 18.

Further, an operating shaft 20a extending from the rear end of the spring receiving member 20 projects outward through the cover 21, and has a knob 20b attached to its tip.

The spring receiving member 20 and the locking means consisting of the protrusion 22 and the slit 23 constitute a spring receiving position switching means D for retracting the limiter 13.

<<Operation>> Next, the operation of the restricting device 10 having the above configuration will be explained.

During normal operation, the spring receiving member 20 is locked and fixed at the pushed-in position where the starting spring 19 is compressed as shown in the figure, and the spring receiving position switching means D is in the pushed-in state in which the limiter 13 is not moved back. In this state, the fuel limit spring 18
operates as a fuel limiting spring under high load in the same way as in the conventional structure.

When starting the engine, the procurement lever 9 is operated to the starting position to strongly tension the governor spring 8. At this time, since the governor force F is zero, the governor lever 5
is strongly pushed in the increasing direction M only by the tension of the governor spring 8. Then, the limiter 13 is strongly pushed in the fuel increasing direction M by the limited portion 15, and the fuel limiter spring 18 is pushed until it comes into contact with the spring receiver 17.
is compressed. Next, the entire movable cylinder frame 16 moves in the increasing direction M while compressing the starting spring 19.

As a result, the fuel increase stroke a during overload is
The amount of starting fuel is increased by a stroke obtained by adding the moving stroke b of the movable cylinder frame 16 to the starting fuel amount.

In addition, in cold weather when starting is difficult even with this increase in fuel amount, by rotating the knob 20b clockwise and pulling it out rearward, the spring catch position switching means D changes the fuel to move the restrictor 13 back. The restriction will be lifted. As a result, the backward stroke c of the spring receiving member 20 is added to the strokes a and b.
It is possible to increase the amount of starting fuel with a stroke that includes .

Note that the means for locking and fixing the spring receiving member 20 at the pushed-in position include the protrusion 22 and the slit 2.
3 may be reversely provided on the cylindrical case 12 and the spring receiving member 20, and the shapes and installation positions of the protrusion 22 and slit 23 can be changed arbitrarily.

<<Effects>> Since the present invention is configured as described above, the following effects are achieved.

(b) In the set state during normal operation, a normal temperature start is possible and no operation is required.

(b) When starting in a cold state where starting is difficult even with the increased amount of fuel, the locking means of the spring receiving position switching means is released and the spring receiving member is moved back to the relaxed side of the starting spring. As a result, the amount of backward movement of the movable cylinder frame can be increased, so that the amount of fuel can be further increased and a strong cold start can be performed.

It is also possible to increase the amount of starting fuel in the same way by screwing in the spring receiving member and moving it back and forth.
In this method, it is extremely troublesome to move the spring receiving member back and forth, and since it is fixed at any position within the range of movement, there is a risk of setting the spring in the wrong position during normal operation. It is a one-touch type and easy to use, and there is no setting error during normal operation, so it can be used safely.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the governor device, Fig. 2 is a cross-sectional plan view of the fuel injection amount limiting device, Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2, and Fig. 4 is a cross-sectional plan view of the conventional structure. It is a diagram. 5... Governor lever, 6... Fuel injection pump,
12...Cylinder case, 13...Restrictor, 18...Fuel restriction spring, 19...Starting spring,
20... Spring receiving member, 22, 23... Locking means, D... Spring receiving position switching means,
G...Governor device, M...Fuel increase direction, S...
Direction of fuel reduction.

Claims (1)

[Claims for Utility Model Registration] Excessive movement of the governor lever 5 in the fuel increase direction M in the governor device G that controls the fuel injection amount of the fuel injection pump 6 is caught by the fuel limiting spring 18 via the limiting device 13. The restriction device 13 and the fuel restriction spring 18 are inserted into the movable cylinder frame 16, the tip of the restriction device 13 is made to protrude outside the front end of the movable cylinder frame 16, and the fuel restriction spring 18 causes the restriction device 13 to Force forward,
Spring receiver 1 fixed to the rear part of the movable cylinder frame 16
7 is configured to receive the fuel restriction spring 18, and a starting spring 19 is disposed behind the movable cylinder frame 16 so that the backward movement of the movable cylinder frame 16 is received by the starting spring 19. A spring receiving position switching means D is disposed behind the starting spring 19 so that the receiving position of the starting spring 19 can be changed, and the biasing force of the starting spring 19 is changed from the biasing force of the fuel restriction spring 18. The spring receiving position switching means D consists of a spring receiving member 20 and locking means 22, 23,
The spring receiving member 20 is connected to the starting spring 19.
The spring receiving member 20 is configured to move forward and backward in the direction of compression and relaxation of the starting spring 1.
The locking means 22, 2 are placed in the position advanced to the compression side of 9.
3 to enable locking and fixing, and the locking means 2
2. A fuel injection amount limiting device for a diesel engine, characterized in that the spring receiving member 20 can be moved to a position where the starting spring 19 is relaxed by releasing the locking fixation of the springs 2 and 23.