JPS6141978Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a distribution type fuel injection pump that distributes fuel to the fuel injection nozzles in each cylinder of an internal combustion engine by the rotation and reciprocation of a single pump plunger. This invention relates to a device for maintaining rotation.

This type of distribution-type fuel injection pump is smaller and lighter than an in-line injection pump, which has the same number of pump plungers as engine cylinders, and is compatible with high-speed rotation. It is widely used instead of. However, as described in Japanese Patent Laid-open No. 50-61529, for example, this distribution type fuel injection pump relies on the force of the spring that engages the accelerator lever with the spill ring that fits into the pump plunger, and the governor mechanism. Since the amount of fuel injection is controlled according to the load and rotation speed by balancing the thrust with the weight, the control of the injection amount is easily affected by the tilt and vibration of the aircraft. The amount of fuel injected will fluctuate due to The effects of vibrations and vibrations are noticeable, and the injection amount is extremely reduced due to the fluctuations, making it impossible to maintain idle rotation.
Eventually, the engine stalled.

The present invention prevents tilt changes and vibrations in this type of distribution fuel injection pump by restricting the spill ring from sliding further in the direction of the injection amount area from the injection charge position during idling rotation. The engine is designed to maintain a predetermined idle rotation.

Next, an example of the present invention will be explained with reference to the drawings.
In the figure, 1 is a main body case of a distribution type fuel injection pump, 2 is a drive shaft that is linked to the crankshaft of an engine (not shown), 3 is a pump plunger that is rotatably and slidably inserted into a plunger barrel 4, Reference numeral 5 denotes a vane-type feed pump provided on the drive shaft 1. The feed pump 5 supplies the fuel in the fuel tank 6 into the main body case 1 through the settler and filter, and excess fuel in the case 1 is transferred to the overflow port 7. The fuel is then returned to the fuel tank 6.

The pump plunger 3 has a plunger spring 8
Plate 10 is pressed against roller 9 by
A coupling 11 is slidably joined to the drive shaft 2, and the rotation of the drive shaft 2 causes the plunger barrel 4 to rotate and reciprocate, and the fuel in the main body case 1 is By the movement of the plunger 3, fuel is distributed and supplied in order from the discharge valve 12 provided for each cylinder of the engine to the fuel injection nozzle (not shown) in each cylinder.

A spill ring 14 is rotatably and slidably fitted on the plunger 3 in the main body case 1 in order to open and close a spill port 13 that communicates the inside of the plunger barrel 4 and the inside of the main body case 1. If the spill ring 14 is slid closer to the plunger barrel 4, the opening timing of the spill port 13 during one stroke of the plunger will be delayed, increasing the fuel injection amount, and if the spill ring 14 is slid further away from the plunger barrel 4, , the spill port 13 opens earlier during one stroke of the plunger, and the fuel injection amount is reduced.

Reference numeral 15 denotes a governor shaft provided parallel to the drive shaft 2. Rotation from the drive shaft 2 is transmitted to the shaft 15 through gears 16 and 17, and when the rotation becomes fast, the weight 19 is rotated to open. Therefore, a governor mechanism 18 is provided that allows the governor sleeve 20 to move in a protruding manner.

Further, 21 is a link mechanism for slidingly controlling the spill ring 14 by the movement of the accelerator lever 22 protruding outside the main body case 1 and the movement of the governor mechanism 18. The link mechanism 21 includes a guide lever 23, It consists of a tension lever 24, a supporting lever 25, and a control lever 26, the middle part of the guide lever 23 is attached to the main body case 1, the lower ends of the tension lever 24 and the supporting lever 25 are attached to the lower end of the guide lever 23,
The upper end of the control lever 26 is rotatably attached to the upper end of the supporting lever 25, respectively.
7, 28, and 29 are pivotally connected, and the lower end of the supporting lever 25 is engaged with the spill ring 14, and the guide lever 23 has a support spring 30 between it and the main body case 1 at its lower end, and a support spring 30 at its upper end. It is equipped with a full load stopper 31, an idle spring 32 between the supporting lever 25 and the tension lever 24, and a start spring 3 between the control lever 26 and the tension lever 24.
3, and the lower end of the control lever 26 is provided with a retractable pin 34 that contacts the tension lever 24, and the pin 34 is connected to the Angleich spring 3.
A control spring 38 connects a pin 36 with a damper spring 37 provided at the upper end of the tension lever 24 and the accelerator lever 22, while the tip of the governor sleeve 20 in the governor mechanism 18 The control lever 26
If the control spring 38 force is increased by rotating the accelerator lever 22, the tension lever 2
4 comes into contact with the stopper 39, the spill ring 14 slides in the direction of increasing the fuel injection amount, and the protruding movement of the governor sleeve 20 causes the spill ring 14 to slide in the direction of the fuel injection amount. It is configured.

A main body case 1 is provided on the side surface of the spill ring 14 opposite to the plunger barrel 4.
A stopper 40, which is an adjusting device screwed onto the plunger 3 so as to be movable forward and backward in the axial direction and the direction perpendicular to the plunger 3, is brought into contact with the plunger 3 to control the sliding of the spill ring 14 in the direction of decreasing the injection amount. The injection amount is regulated at the position and is configured so as not to slide in the direction of decreasing the injection amount from this position. In addition,
The tip of the stopper 40 is formed into a conical shape, and the restriction position relative to the spill ring 14 can be finely adjusted by screwing the stopper 40 back and forth.

In this configuration, the accelerator lever 22 of the engine
When the control lever 24 is moved in the direction of higher output, the tension lever 24 is pulled until it comes into contact with the stopper 39 via the control spring 38, while the start spring 33 presses the control lever 26 against the governor sleeve 20, causing the weight 19 to move. Since the supporting lever 25 is closed, the upper end of the supporting lever 25, which is pivotally connected to the control lever 26 by the pin 29, rotates to the left about the pin 28, and the spill ring 14, which is engaged with the lower end of the supporting lever 25, slides in the direction of increasing the fuel injection amount. Since the engine moves, the amount of fuel injected at the time of starting is obtained, and the engine starts.

To idle the engine after starting, move the accelerator lever 22 to the idle position.
The control spring 38 is loosened, so the start spring 33 no longer presses the governor sleeve 20, the weight 19 in the governor mechanism 18 spreads even at low speed rotation, and the governor sleeve 20 holds the upper ends of the control lever 26 and tension lever 24 at idle. By moving the supporting lever 25 to the right against the spring 32 and the damper spring 37,
The upper end rotates to the right around the pin 28, and the spill ring 14, which engages with the lower end, is controlled in the direction of reducing the fuel injection amount by the thrust of the governor mechanism 18, the idle spring 32, and the damper spring 37 forces, and in turn, Since it slides to a position where the force of the spring 38 is balanced, the fuel injection amount at a predetermined idle rotation can be obtained (second
figure).

Then, when the accelerator lever 22 is rotated in the direction of increasing the output, the force of the control spring 38 increases, causing the tension lever 24 and the supporting lever 2 to
5 rotates counterclockwise to a position where it balances the thrust of the governor mechanism 18, and the spill ring 14 that engages with its lower end slides in the direction of increasing the fuel injection amount, so that the fuel injection amount at a predetermined load is obtained. Also, when the accelerator lever 22 is rotated to the full output position, the control spring 3
As the force increases, the damper spring 37 is completely compressed and becomes inactive, and the tension lever 24 is fixed in contact with the stopper 39.
Since the control lever 26 is pressed by the thrust of the governor mechanism 18 so that the fulcrum 41 and the protruding pin 34 come into contact with the tension lever 24,
The spill ring will be held at the fuel injection amount position at full load (this full load state can be adjusted by the full load stopper 31), and if the engine speed increases further from this full load state, the control Since the lever 26 rotates around the fulcrum 41 against the reverse Angleich spring 34 due to the thrust of the governor mechanism 18, the upper end of the supporting lever 25 rotates to the left, and the spill ring 14 injects fuel. It is slid in the direction of increase.

In the idle rotation state, the spill ring 14 is only held by the balance between the thrust of the governor mechanism 18 and the spring force, so if there is no stopper 40 as a conventional adjustment device for the spill ring 14, When a car leans, such as when it approaches a slope, the thrust changes due to the movement of the weight in the direction of the resultant force due to the gravity of the governor mechanism, or the spring force is changed due to the weight of various levers acting on the spring. If the fuel injection amount changes or is subjected to vibration, the spill ring 14 can further move in the direction of reducing the injection amount.

In contrast, the present invention is provided with a stopper 40 which is an adjustment device for the spill ring 14, and when the spill ring 14 reaches the fuel injection amount position when the engine is idling, the stopper 40
0 and is prevented from sliding any further in the direction of decreasing the fuel injection amount.

As described above, the present invention provides a distribution type fuel injection pump in which a pump plunger is slidably fitted with a spill ring for controlling the fuel injection amount according to the engine load and rotation speed. The main body case of the fuel injection pump is provided with a stopper that comes into contact with the spill ring when the spill ring is in an idling rotation position and restricts the sliding of the spill ring to reduce fuel injection. Since the stopper can prevent the spill ring from sliding in the direction of decreasing the fuel injection amount due to vibration and tilt during engine idling, the stopper can prevent tilt and tilt during engine idling. This has the effect of being able to reliably and smoothly maintain idle rotation against vibrations and preventing the engine from stopping.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of a distribution injection pump, and FIG. 2 is an enlarged view of the main part of FIG. 1, showing the state at idle rotation. 1... Main body case, 2... Drive shaft, 3...
Pump plunger, 4... Plunger barrel, 1
4... Spill ring, 18... Governor mechanism, 2
2...Accelerator lever, 21...Control link mechanism, 40...Stopper.

Claims (1)

[Scope of utility model registration request] A distribution type fuel injection pump comprising a pump plunger slidably fitted with a spill ring for controlling the amount of fuel to be injected according to the load and rotation speed of the engine, the main body case of the distribution type fuel injection pump. An idle distribution type fuel injection pump characterized in that a stopper is provided which contacts the spill ring at the idle rotation position of the spill ring and restricts the sliding of the spill ring to reduce fuel injection. Rotation adjustment device.