JPH0212284Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a governor device for a diesel engine, and when the engine is idling in a tilted state, the governor lever deviates to the fuel increase side due to its own weight, and the idling speed increases abnormally. The purpose is to eliminate these shortcomings with a simple structure.

In general, the governor device of a diesel engine is
As shown in FIG. 8, a governor lever 51 whose lower end is pivoted as a swinging fulcrum 50 is connected to a centrifugal governor 5.
The governor force of 2 is balanced with the tension of the governor spring 53, and the fuel injection pump 54 is operated by swinging.
The fuel injection amount is adjusted.

However, the pivot point 50 of the governor lever 51
Since this is located at the lower end of the governor lever 51, when the engine is tilted forward and downward when the engine is used on a slope, the governor lever 51 is deviated toward the fuel increase side due to its own weight, and the idling speed of the engine increases abnormally.

For example, when the engine is mounted on a tractor or the like and the power is intermittent using a centrifugal clutch, if the idling speed increases abnormally, the centrifugal clutch engages unexpectedly, causing the tractor to run out of control and go down a hill.

The present invention was proposed to eliminate the above-mentioned drawbacks, and utilizes a stop device that forcibly operates the governor lever to make the fuel injection pump do not inject, and is equipped with an idling rotation guarantee spring. By absorbing the excessive swinging of the governor lever when tilting, the system prevents abnormal increases in idling speed on slopes.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a longitudinal sectional front view of a governor device attached to a diesel engine, and FIG. 2 shows a plan view thereof.

This governor device 1 rotatably supports a fuel camshaft 4 that operates a fuel injection pump 3 provided in a governor device chamber 2, and a centrifugal governor 6 provided on the back side of a cam gear 5 that drives the fuel camshaft 4. The governor spring 8 is operated by the governor force and the accelerator lever 7.
The fuel injection amount of the fuel injection pump 3 is adjusted by swinging the governor lever 9 in balance with the tension of the fuel injection pump 3.

The governor lever 9 is the main governor lever 9a.
and a sub-governor lever 9b, and a pivot pin 11 fixed to the lower part of the sub-governor lever 9b with a screw 10.
The lower part of the main governor lever 9a is pivotably supported, and this pivot pin 11 is pivoted to one side wall (fixed wall) 2a of the governor device chamber 2, so that the governor lever 9
A fulcrum portion 12 is formed (see FIG. 3).

The main governor lever 9a is formed in an inverted L-shape, and has an engine stop input part 13 with bent ends at the top and an output part 15 that engages with a control rack (fuel adjustment rack) 14 of the fuel injection pump 3.
A locking portion 17 for the return spring 16 is formed, and a governor input portion 18 for receiving the governor force of the centrifugal governor is formed at the lower end.

The secondary governor lever 9b has a spring input part 20 formed at its upper part that receives the tension of the governor spring 8, and the tension of the governor spring 8 that the secondary governor lever 9b receives is transmitted through a continuous pin 21 provided at the middle part of the main governor lever 9a. The signal is transmitted to the main governor lever 9a.

As shown in FIG.
The shaft portion 26 of the swinging arm 25 of the cover plate 24 that covers the adjustment window 23 is pivotally supported, and a pin 27 is attached to the end of the swinging arm 25.
is erected to form the stop operation output section 28, and an operating arm 30 that is operated by a manual knob 29 is provided at the outer end of the shaft section 26.

This knob 29 can be operated in order from the front to a stop position 31, a slope idling rotation guarantee position 32, and an engine operating position 33. It is adapted to be held by a click stop device 35 provided on the connecting rod 34.

As shown in FIG. 4, the swing arm 25 is provided with an idling rotation ensuring spring 36 made of spring steel.

This allows the lower end portion 36a to be connected to the shaft portion 26 of the swinging arm 25.
At the same time, the upper end portion 36b is fixed to the swing arm 25.
The guide hole 37 formed in the pin 27 is penetrated so that it can move forward and backward.

The spring constant of the idling rotation guarantee spring 36 is weak enough to prevent the governor lever 9 from swinging excessively toward the fuel increase side r due to its own weight when the engine is used on a slope.

Engine stop operation device 2 configured as above
2 and the operation of the idling rotation guarantee spring 36 will be explained below.

First, during normal engine operation, when the accelerator lever 7 is set to the desired engine speed at the engine operating position 38, the engine is set by balancing the tension of the governor spring 8 with the governor force of the centrifugal governor 6. The rotation speed will be maintained at the specified speed.
At this time, the engine stop operation device 22 is operated by the knob 29.
Since the engine is in the innermost engine operating position 33, the engine stop operating device 22 is moved as shown in FIG. 5A.
Also, the idling rotation guarantee spring 36 is far outside the movement range H of the governor lever 9 during normal operation, and cannot prevent the governor lever 9 from swinging.

Next, when setting the engine to idling rotation, move the accelerator lever 7 to the idling rotation position 3.
When set to 9, the tension of governor spring 8 is loosened.
The governor lever 9 is swung toward the fuel reduction side l by the governor force, reducing the fuel injection amount and bringing the rotational speed to idling.

When the engine is used in the idling state, the knob 29 of the engine stop operation device 22 is set to the slope idling rotation ensuring position 32 and held by the click stop device 35. Then, as shown in FIG.
Since the governor lever 9 is prevented from moving excessively to the fuel increase side r due to its own weight, an abnormal increase in the idling speed is eliminated even when the engine is used at an inclined position.

Moreover, when stopping the engine, if the engine stop operation device 22 is set to the engine stop position 31,
As shown in FIG. 5C, the pin 27 of the swing arm 25 directly operates the engine stop input section 13 of the governor lever 9 to the fuel reduction side l, causing no fuel injection and stopping the engine.

6 and 7 respectively show different embodiments, and in the one shown in FIG. 6, the idling rotation guarantee spring 36 provided in the stop operation output part 28 of the engine stop operation device 22 is a coil spring. The one shown in FIG. 7 is constructed so that a rod 42 is pushed out by a spring 41 in which an idling rotation guarantee spring 36 is housed in a cylindrical case 40.

The present invention is constructed and operates as described above, and has the following effects.

That is, when the engine is tilted, the governor lever tends to move excessively toward the fuel increase side due to its own weight, but the idling rotation guarantee spring provided in the engine stop operating device catches the governor lever and prevents the governor lever from moving excessively toward the fuel increase side. Therefore, it is possible to reliably prevent the idling speed from increasing abnormally, thereby reliably preventing the risk of the centrifugal clutch suddenly engaging and causing the vehicle to run out of control.

Moreover, the device for this purpose uses an existing stop operation device and only needs to add an idling rotation guaranteeing spring to it, so the structure is simple and can be implemented at low cost.

[Brief explanation of the drawing]

Figure 1 is a partially longitudinal front view showing the peripheral structure of the governor device of a diesel engine, Figure 2 is a plan view,
Fig. 3 is a sectional view taken along the - line in Fig. 1, Fig. 4 is a perspective view of the main parts, Figs. 5 A, B, and C are front views showing the operating states of the main parts, and Figs. 6 and 7. 8 shows a cross-sectional plan view of the main part of another embodiment, and FIG. 8 is a schematic front view of the main part of the conventional example. DESCRIPTION OF SYMBOLS 1... Governor device, 2a... Fixed wall, 3... Fuel injection pump, 6... Governor, 8... Governor spring, 9... Governor lever, 12... Fulcrum part,
13...Engine stop input part, 14...Fuel adjustment rack, 15...Output part, 18...Governor input part, 20...Spring input part, 22...Engine stop operation device, 28...Stop operation output Part, 31
...Engine stop position, 32...Slope idling rotation guarantee position, 33...Engine operating position,
36...Idling rotation guarantee spring, l...
...Fuel reduction side, r...Fuel increase side, H...Movement area.

Claims (1)

[Claims for Utility Model Registration] The governor lever 9 of the governor device 1 of the diesel engine has a fulcrum part 12 at the lower part, an output part 15 at the upper part,
Governor input part 18, spring input part 2 in part
0, an engine stop input section 13 is provided, and its output section 15 is connected to the fuel adjustment rack 14 of the fuel injection pump 3.
The fulcrum part 12 is connected to the fixed wall 2 of the engine.
A is pivotally supported to be swingable in the fuel increase/decrease direction, and the governor 6 is interlocked and connected to the governor input part 18 so as to be pushed toward the fuel decrease side l, and the governor spring 8 is connected to the spring input part 20 so as to be pushed toward the fuel increase side r.
The governor spring 8
The engine stop input section of the governor lever 9 is configured to control the rack 14 in the fuel increase/decrease direction via the governor lever 9 by balancing the output of the governor 6 with the output of the governor 6 to maintain the engine rotation speed at a set value. The stop operation output section 28 of the engine stop operation device 22 is made to face 13 from the fuel increase side r, and the stop operation output section 28
The engine operating position 33 and engine stop position 31
The stop operation output section 28 is configured to be able to move forward and backward.
When the engine is moved back to the engine operating position 33,
When the stop operation output section 28 is located outside the movement range H of the fuel increase/decrease control of the governor lever 9 and the stop operation output section 28 is advanced to the engine stop position 31, the stop operation output section 28 causes the governor lever 9 to stop the engine. In the diesel engine governor device configured to push the input section 13 toward the fuel cut position, the stop operation output section 2 of the engine stop operation device 22 is provided.
In advance of this, an idling rotation ensuring spring 36 is attached to the engine stop input part 13 of the governor lever 9, and the stop operation output part 28 is moved to a slope between the engine operating position 33 and the engine stop position 31. When the engine stop input section 13 of the governor lever 9 is configured to be able to be maintained in the idling rotation guarantee position 32 and the stop operation output section 28 is positioned at the slope idling rotation guarantee position 32, the idling rotation guarantee spring 36 is configured so that the engine stop input section 13 of the governor lever 9 The configuration is such that the governor lever 9 is located at a position that detects and prevents excessive movement from the idling rotation fuel position to the fuel increase side r, and when the engine is tilted, the governor lever 9 moves excessively from the idling rotation fuel position to the fuel increase side r due to its own weight. A governor device for a diesel engine, characterized in that a spring constant of an idling rotation guarantee spring 36 is set to a value corresponding to the force to be used.