JPH0441228Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a fuel injection pump device that reliably defines the maximum injection amount during operation.

<Prior Art> A conventional fuel injection pump 01 will be described with reference to FIG. The swinging end 06 of 05 is engaged.

The governor lever 05 is pivotally supported by the engine body etc. via a pin 07, and a governor device 08 driven by the engine urges the control rack 03 in the direction of decreasing the injection amount in response to an increase in engine speed, and accelerates the engine. The control rack 03 is urged in the direction of increasing the injection amount by the governor spring 010 whose urging force changes as the lever 09 rotates. According to the above configuration, during normal operation, the governor lever 05 appropriately controls the position of the control rack 03 by the biasing force of the governor device 08 and the biasing force of the governor spring 010 to control the injection amount of the pump body 02.

The pump body 02 also includes a smoke set plate 011 that regulates the position of the control rack 03 to limit the maximum injection amount of smoke emitted during normal operation.
The smoke set plate 011 is fixed to the pump body 02 via a pin 012 and is biased by a spring 013 in the direction of decreasing the injection amount, so that the first regulating surface 014 that regulates the maximum injection amount becomes a stopper. 015, which restricts the clockwise direction in the figure and restricts the increase in starting power.
The restriction surface 016 is restricted in the counterclockwise direction in the drawing at the position where it abuts the stopper 015.

The smoke set plate 011 is attached to the governor lever 05 on the rack pin 04 as shown in FIG.
The biasing force of the governor spring 010 acting through the governor spring 010 rotates to the starting and increasing position.

<Problems to be solved by the invention> However, the above conventional fuel injection pump 01
According to , after the accelerator lever 09 is set at the normal starting position and the engine is started, when a load is applied under normal operating conditions, the governor lever 05 is biased counterclockwise due to a decrease in engine rotational speed.
Rack pin 04 is smoke set plate 011
At the position where the control rack 013 comes into contact with the control rack 03, the maximum injection amount of fuel is injected at the limit of smoke emission under normal operating conditions. There was a problem in which the fuel was biased in the direction of increase, resulting in an excessive amount of fuel and increased smoke in the exhaust gas.

To solve the above problem, increase the biasing force of the spring 013 of the smoke set plate 011,
If the increase range is restricted, the starting increase will be insufficient.
This causes a problem that causes poor startability.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a fuel injection pump device that reliably defines the maximum injection amount during operation.

<Means for Solving the Problems> The combustion injection pump device of the present invention has a control rack for controlling the combustion injection amount, and uses a governor device whose biasing force changes in accordance with the rotational speed of the engine. In a combustion injection pump device having a structure in which a control rack is biased in the direction of decreasing the injection amount, and a governor spring is used to bias the control rack in the direction of increasing the injection amount, this control is performed in the direction of increasing the injection amount of the control rack. a rotatable smoke set plate having a rack pin contact surface that can come into contact with a rack pin that is integral with the rack; a spring that biases the smoke set plate in a direction to decrease the injection amount of the control rack; and the smoke set plate. a stopper pin capable of positioning the smoke set plate at a maximum injection amount position during operation, which is one end of rotation of the smoke set plate by the spring; a rotatable angle-grain set plate having a slope formed thereon that can come into contact with the engaging end of the smoke set plate in the injection quantity position and restrain the rotation of the smoke set plate in the direction of increasing the injection quantity; A spring that biases the angle grill set plate so that the smoke set plate is biased in a direction to decrease the injection amount when the inclined surface of the angle brake set plate and the engagement end of the smoke set plate are in contact with each other. It is characterized by having the following.

<Function> During operations other than starting, the spring assembled to the smoke set plate urges the smoke set plate to the maximum injection amount position during operation, where the pin contact surface of the smoke set plate contacts the stopper pin. .

On the other hand, the spring attached to the Angleich set plate presses the inclined surface of the Angleich plate against the engagement end of the Smoke set plate, and the Smoke set plate is held between the stopper pin and the inclined surface of the Angleich set plate. The state will be as follows.

As a result, the rotation of the smoke set plate in the direction of increasing the injection amount is restricted, so when the control rack is in operation, the smoke set plate may move beyond the maximum injection amount and come into contact with the rack pin that is integrated with the control rack. This will be regulated by the rack pin contact surface.

<Example> A combustion injection pump device according to an example of the present invention will be described based on FIGS. 1 to 4.

The pump main body 2 is provided in the engine main body 3, and a control rack 4 controls the combustion injection amount.
and the rack pin 6 of the control rack 4
A swing end 10 of the governor lever 8 is engaged with the pivot end 10 of the governor lever 8. The governor lever 8 is pivotally supported by the engine body 3 etc. via a pin 12, and a governor device 14 driven by the engine urges the control rack 4 in the direction of decreasing the injection amount in response to an increase in engine speed. The control rack 4 is controlled by a governor spring 18 whose biasing force changes as the accelerator lever 16 pivots on the engine body 3.
is biased in the direction of increasing the injection amount.

20 is a smoke set plate that regulates the control rack 4 between the starting amount increasing position and the maximum injection amount position during operation, and is pivotally supported by the pump body 2 and biased counterclockwise in the figure by a spring 22. As shown in FIG. 1, it is restorably held in a position where it abuts against the stopper pin 24. The smoke set plate 20 has a first plate branched at approximately 90 degrees.
It has an arm 25 and a second arm 26, and the first arm 25 has a pin contact surface 2 that contacts the stopper pin 24.
7, and an english set plate 28, which will be described later.
The second arm 26 has an engaging end 31 that engages with an inclined surface 30 formed on the first arm 29 of the first arm 29, and the second arm 26 has an engaging end 31 that engages with an inclined surface 30 formed on the first arm 29. It has an engaging portion 34 that engages.

Reference numeral 28 denotes an angle setting plate that regulates the position of the smoke set plate 20 to the maximum injection amount position during operation, and is branched into two parts to connect to the first arm 2.
9 and a second arm 33, which is pivotally supported by the pump body 2 and biased counterclockwise in the figure by a spring 35, so that the second arm 33 can be restored to the position where it abuts the stopper pin 36. is maintained. The tip of the second arm 33 is formed with a reset surface 37 and an engagement surface 38 for the engagement end 34 of the second arm 26 of the smoke set plate 20.

With the above structure, during normal operation, the smoke set plate 20 and the angle set plate 28 are held in the positions shown in FIG. 2 arm 26 (rack pin contact surface 3
2) and the first arm 29 of the angle reset plate 28 by the urging force of the governor device 14 and the governor spring 18. That is, when the engine load increases and the rotational speed decreases during operation, the biasing force of the governor device 14 decreases, and the rack pin 6 is moved leftward in the figure by the biasing force of the governor spring 18, and the smoke set plate 20 At this position, the maximum injection amount at the limit of smoke emission is obtained. In this way, the smoke set plate 20 at the maximum injection amount position during operation that defines the maximum injection amount has its engaging end 31 in contact with the inclined surface 30, so that not only the biasing force of the spring 22 but also the angle 28 also restricts rotation in the clockwise direction in the figure (injection amount increasing direction), and even if a force in a direction exceeding the maximum injection amount is applied to the rack pin 6 by the governor lever 8, the smoke set plate Further movement of the control rack 4 can be prevented by maintaining the position 20 at the maximum injection amount position during the operation, thereby preventing an increase in smoke emission.

Here, the inclined surface 30 is in line contact with the engaging end 31 which is the ridge of the two surfaces forming a part of the first arm 25 of the smoke set plate 20, and is inclined with respect to these two surfaces. Due to the biasing force of the spring 35 of the Angleich plate 28, the slope 30 is set to the smoke set plate 2 which is at the maximum injection amount position during operation.
It always comes into contact with the engaging end 31 of 0. Moreover, as is clear from FIG. 1, when the smoke set plate 20 rotates in the direction of the injection amount, the engaging end 31 bites into the inclined surface 30. Rotation in the direction of increasing the amount is reliably restrained.

Next, when the accelerator lever 16 is moved to the engine stop position shown by the chain line in FIG. As shown, it is moved to the rightmost position, and the injection of the pump body 2 is stopped to stop the engine. In this operation, the rack pin 6 presses the first arm 29 of the angle reset plate 28, rotates the angle reset plate 28 counterclockwise in the figure, and resets the reset surface 3 of the second arm 33.
7 presses the engaging portion 34 of the smoke set plate and returns to its original position, the engaging surface 38 engages with the engaging portion 34. Therefore, even if the rack pin 6 returns to the left in the figure after the engine is stopped, the angle hitch set plate 28 is maintained in the state shown in FIG. 2.

When the accelerator lever 16 is rotated to the solid line position in FIG. 4 to restart the engine, the biasing force of the governor spring 18 causes the governor lever 8 to move the rack pin 6 to the maximum position during operation as shown in FIG. Move it to the leftmost position beyond the injection position. In this operation, the smoke set plate 20 is pressed by the leftward movement of the rack pin 6 and is rotated counterclockwise in the figure, but the engagement surface 38 is already engaged at the position where it disengages from the engagement part 34. Since the mating end 31 is rotated clockwise in the figure from the inclined surface 30, the smoke set plate 2
0 allows the rack pin 6 to be rotated to the starting increasing position shown in FIG. 3 without being restricted by the angle setting plate 28 and moving to this starting increasing position.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, the spring 22,
35 may be a coil spring, or the shapes of the smoke set plate 20 and the angle set plate 28 may be changed in various ways.

<Effects of the invention> According to the fuel injection pump device of the invention, the engaging end of the smoke set plate which is in contact with the stopper pin and is at the maximum injection amount position during operation is brought into contact with the inclined surface formed on the angle-grain set plate. This makes it possible to reliably specify the maximum injection amount during operation without causing deterioration in startability, and to realize operation without causing an increase in smoke emissions. In addition, when the smoke set plate is at the maximum injection amount position during operation, the inclined surface of the angle grill set plate is always brought into contact with the engaging end of the smoke set plate due to the spring. The position of the maximum injection amount during operation of the smoke set plate can be regulated only by the positional accuracy of the stopper pin and the pin abutting surface of the smoke set plate that comes into contact with the stopper pin, without being affected much by the processing accuracy of the plate.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a set plate portion of a fuel injection pump device according to one embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams of the operation of the set plate portion, and FIG. 4 is a diagram showing the configuration of the fuel injection pump device.
FIG. 5 is a diagram showing the configuration of a conventional fuel injection pump device, and FIG. 6 is a diagram showing the configuration of the set plate portion thereof. In the figures, reference numeral 4 denotes a control rack, 6
1 is a rack pin, 14 is a governor device, 18 is a governor spring, 20 is a smoke set plate, 2
2, 35 is a spring, 24 is a stopper pin, 2
Reference numerals 7 and 32 denote pin abutment surfaces, 28 denotes an Angleich plate, 30 denotes an inclined surface, and 31 denotes an engagement end.

Claims (1)

[Scope of utility model registration request] The control rack has a control rack for controlling the fuel injection amount, and a governor device whose urging force changes in accordance with the rotational speed of the engine urges the control rack in a direction to decrease the injection amount, and a governor spring forces the control rack to decrease the injection amount. In a fuel injection pump device configured to bias the rack in the direction of increasing the injection amount,
A rotatable smoke set plate is provided with a rack pin contact surface that can come into contact with a rack pin integral with the control rack in the direction of increasing the injection amount of the control rack, and the smoke set plate is used to increase the injection amount of the control rack. The smoke set plate is brought into contact with a pin contact surface formed on the smoke set plate, and the smoke set plate is brought into contact with a spring biased in the decreasing direction, and the smoke set plate is brought into contact with the maximum injection amount position during operation, which is one end of rotation of the smoke set plate by the spring. A stopper pin capable of positioning the plate and an inclined surface capable of coming into contact with the engagement end of the smoke set plate at the maximum injection amount position during the operation and restraining the rotation of the smoke set plate in the direction of increasing the injection amount are formed. The smoke set plate is urged in a direction to decrease the injection amount with the rotatable angle set plate in contact with the inclined surface of the angle set plate and the engaging end of the smoke set plate. 1. A fuel injection pump device, comprising: a spring that biases the angle setting plate so as to cause the angle to rise.