JPS6038031Y2 - Engine governor system fuel limiting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a fuel limiting device for an engine governor device.
The purpose is to prevent black smoke from being emitted due to excessive fuel supply when the engine suddenly accelerates.

Generally, in an engine equipped with a governor device that is equipped with a fuel limiting device, when the engine rotational speed fluctuates during normal operation, the fuel limiting device and the governor device supply the engine with an amount of fuel commensurate with the rotational speed. There is.

However, if the engine is suddenly accelerated or suddenly subjected to a high load, the amount of fuel supplied becomes excessive, causing incomplete combustion and emitting black smoke, which not only causes pollution but also wastes fuel. become.

This invention was proposed in order to eliminate the above-mentioned drawbacks, and a damper is incorporated into the governor device that controls the rotation of the engine, and this damper is used to control the fuel supply amount (fuel injection pump).
This is to prevent the supply amount control device (rack) from suddenly moving excessively toward the fuel increase side, thereby eliminating excessive supply of fuel.

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show a water-cooled horizontal diesel engine,
A governor device 3 is provided within a gear case 2 fixed to the front surface of the crankcase 1.

This governor device 3 is constructed as follows.

That is, the rack 5 of the fuel injection pump 4 is pulled to the increasing side r via the governor lever 6 by the weak force of the auxiliary spring 7 when the engine is stopped, and is pulled to the increasing side r by the governor spring 8 when the engine is running. It is pushed to the fuel restriction side 1 by force 10.

A fuel limiting device 14 that limits the maximum injection amount of the fuel injection pump 4 is fixed to the gear case 2, and this is shown in FIGS.
It is configured as shown in the figure.

That is, the fuel restriction device 14 is attached to the mounting boss 11 of the gear case 2.
The cylindrical frame 12 is screwed together and fixed with a lock nut 13.

Spring insertion hole 1 provided in the front half of the cylinder frame 12
A fuel limiting rod 16 is inserted into the fuel limiting side 5 so as to be movable back and forth, and is biased toward the fuel limiting side 1 by a torque spring 17.

The tip end 16a of the fuel limiting rod 16 protrudes into the gear case 2 and stops receiving the abutment surface 18 of the governor lever 6, thereby limiting excessive movement of the rack 5 of the fuel injection pump 4 to the increasing side r.

At this time, the fuel limiting rod 16 moves backward against the torque spring 17 due to the force of the governor lever 6 moving toward the increase side near the maximum fuel injection amount.

An oil-type damper D is installed behind the large-diameter fuel-limiting rod portion 16b that slides back and forth in the spring insertion hole 15 of the cylinder frame 12.

As shown in FIG. 3, this consists of an outer cylinder 19 that stands up from a screw cap 18 that covers the opening of the spring insertion hole 15, and an inner cylinder 20 that slides back and forth in an oil-tight manner inside this outer cylinder 19. The case of the damper D is shaped like this, and the valve plate 21 is attached to the open end surface of the inner cylinder 20.
A reed valve V consisting of a reed 22 and a reed 22 is fixed.

The valve plate 21 has a large diameter orifice 23 and the reed 22 has a small diameter orifice 23.24, and the reed valve V allows the oil stored in the spaces 25.26 in the outer cylinder 19 and inner cylinder 20 of the damper D to be opened. 27 to control the flow of fuel restriction rod 1
Suppress the sudden retreat of 6.

That is, when a high load is applied to the engine during operation, the rotational speed suddenly decreases and the governor force 10 decreases, or when the accelerator lever 28 is suddenly operated to the high speed side and the tension of the governor spring 8 suddenly decreases. When the tension of the governor spring 8 becomes strong, the tension of the governor spring 8 causes the fuel limiting rod 16 to move backward at once beyond its normal rotation control range via the governor lever 6.

In this way, the fuel limiting rod 16 tries to retreat rapidly, compressing the damper D and pushing the inner cylinder 20.

Then, the lead 2 of the reed valve ■ provided at the rear end of the inner cylinder 20
2 covers the large diameter orifice 23 of the valve plate 21, and the outer cylinder 19
The flow rate of the oil contained in the inner cylinder is controlled by the small diameter orifice 27 provided in the lead and flows into the inner cylinder 20, so that even if the tension of the governor spring 8 suddenly becomes strong, the fuel limiting rod 6 remains constant. Slowly move back to the fuel increase side r.

On the contrary, if the engine speed increases too much and the governor force 10 of the governor 9 becomes strong, the tension of the torque spring 17 moves the fuel limiting rod 16 to the fuel decreasing side.
push it out.

At the same time, the inner cylinder 20 of the damper D is also extended by the return spring 29 provided around the damper D.

At this time, the reed 22 of the reed valve (■) provided at the rear end of the inner cylinder 20 opens the large diameter orifice 23 of the valve plate 21, from which a large amount of oil 27 in the inner cylinder 20 flows into the outer cylinder 19. Therefore, damper D expands rapidly.

In this way, the size of the orifices 23 and 24 formed in the valve plate 21 and the reed 22 of the reed valve 2, which controls the contraction and expansion speed of the oil damper D, depends on the tension of the governor spring 8, the governor characteristics of the governor 9, and the like. It is appropriately set according to the rising speed of the engine rotation speed.

It is also conceivable to change the type of damper D from an oil damper to an air damper.

The present invention is structured and works as described above, so that when the engine is suddenly accelerated or a high load is suddenly applied, the supply amount control device of the fuel supply device suddenly moves excessively toward the fuel increase side. While the damper buffers this, the governor force gradually becomes stronger and soon balances the tension of the governor spring, suppressing excessive movement of the feed rate control device and preventing incomplete Can eliminate combustion, no black smoke emission.

Moreover, the fuel supplied to the engine is completely combusted without waste, so there is no wastage of fuel.

Furthermore, when the governor lever or the supply amount control device moves forward toward the fuel restriction side, it can be moved forward by the tension of the torque spring, so the tension of the torque spring acts as a force to push out the governor lever and the like.

Therefore, the torque spring can always exhibit appropriate torque performance when the governor lever etc. moves backward and forward.

Furthermore, when the governor lever etc. collides with the pusher, the pusher moves slightly while the reed valve reed covers the valve plate, buffering the impact on the pusher and applying a sudden load to the torque spring. Since this is prevented, the durability of the torque spring can be improved.

Furthermore, since the damper is incorporated into the fuel restriction device, the structure is simple and inexpensive to assemble, and can be easily implemented even in existing engines.

[Brief Description of the Drawings] The drawings show an embodiment of the present invention. Figure 1 is a front view of a water-cooled horizontal diesel engine, Figure 2 is a cross-sectional view along the line ■-■ in Figure 1, and Figure 3 is a cross-section of main parts. It is a diagram. D...Damper, 1...Fuel reduction side,
r...Fuel increase side, 3...Governor device, 4...Fuel supply amount controller (fuel injection pump)
, 5... Supply amount control device (rack), 6...
...Governor lever, bottom ...Governor spring, 1
2...Cylinder frame, 14...Fuel restriction device,
16... Push tool (fuel restriction rod), 16a...
...16 tip, 17...torque spring.

Claims (1)

[Scope of utility model registration request] With the balanced force between the governor spring 8 and governor force 10 of the engine governor device 3, via the governor lever 6,
The supply amount control device 5 of the fuel supply amount controller 4 is configured to be movable in a controlled manner. At least one of the waist governor lever 6 and the supply amount control device 5 is received by a fuel restriction device 14 to limit excessive movement toward the fuel increase side r. The pusher 16 is inserted into the cylindrical frame 12 constituting the fuel restriction device 14 so as to be able to move forward and backward, and the tip 16a of the pusher 16 is projected outside the cylindrical frame 12, and the rear end of the pusher 16 is The diameter portion 16b is held on the circumferential surface of the spring insertion hole 15 formed in the cylinder frame 12 so as to be able to slide forward and backward, and the large diameter portion 1 at the rear end of the pusher 16 is held by the torque spring 17 installed inside the cylinder frame 12.
6b is moved forward by pressing it toward the fuel restriction side l, the tip end 16a of the push tool 16 is opposed to at least one of the governor lever 6 and the supply amount control tool 5, and a damper D that buffers the backward speed of the push tool 16 is moved forward. The bottom cover 18 of the cylindrical frame 12 is assembled into the frame 12.
The case of the damper D is formed by the outer cylinder 19 formed by raising the peripheral wall from the outer cylinder 19 and the inner cylinder 20 provided at the lower part of the large diameter portion 16b at the rear end of the pusher 16. A recessed part having an opening in the outer cylinder 19 is formed into the inner cylinder 20 by tightly fitting and inserting it into the inner cylinder 20 so as to be able to freely slide forward and backward. Large diameter orifice 23
A reed valve (■) consisting of a valve plate 21 with a small diameter orifice 24 opened and a reed 22 with a small diameter orifice 24 opened is fixed, and the lead 22 is attached to the valve plate 21 to cover the valve plate 21 when the pusher 16 moves back. A fuel restriction device for a governor device of an engine, characterized in that the valve plate 21 is assembled so as to be opened when the valve plate 21 is opened.