JPH09250364A - Centrifugal governor for diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a constitution and to reduce cost by controlling the amount of torque- up while an engine is running. SOLUTION: An oscillating support point P of a connecting rod 14 is mounted to a speed governor lever 7 and the other end of the connecting rod 14 is mounted to a pivot guide 15 on a first lever 1a such that it can oscillate. A rod controlling member 16 is disposed opposite to the connecting rod 14 such that it can be moved forward and backward to control with the connecting rod 14 the oscillation toward a fuel increasing side R, whereby the amount of projection of the torque pin 3a of a torque- up device 3 in the overload state of an engine can be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal governor for a diesel engine, and more particularly to a technique for regulating the amount of torque increase in an overload operation state.

[0002]

2. Description of the Related Art A conventional centrifugal governor for a diesel engine is constructed, for example, as shown in FIG. That is,
The rack pin 5 of the fuel injection pump 6 is elastically pressed toward the fuel increasing side R via the speed adjusting lever 7 by the start spring 2 hooked on the first lever 1a and the governor spring 8 hooked on the second lever 1b. On the other hand, the governor force G is configured to press the fuel amount reduction side L. At the time of engine starting operation, the rack pin 5 is configured to be elastically pressed to the starting increasing position S _T by the tension of the start spring 2 via the first lever 1a. The rack pin 5 is metered within the metering range from the full load equivalent position (4/4) to the torque up equivalent position (T _U ) via the 1 lever 1a,
The engine is configured to increase torque and exhibit tenacity.

By the way, in the above-mentioned conventional centrifugal governor,
At the stage of assembling and adjusting the centrifugal governor, the torque increase amount of the torque increase device 3 cannot be adjusted during engine operation. This is because it is necessary to stop the engine and replace the torque-increasing device 3 with a torque pin 3a having a different length (projection amount). Also, the torque increasing device 3
When replacing the, the length of the torque pin 3a (projection amount)
It is necessary to strictly manage the tolerance of.

In such a case, a limit pin similar to the fuel limiter 9 provided on the governor wall 28 so as to be adjustable forward and backward is brought into contact with the first lever 1a so that the fuel increase side R of the first lever 1a is moved. It is conceivable to regulate the swing. However, if this is done, the limit pin will move to the first lever 1 when the engine is started.
Therefore, the rack pin 5 cannot be located at the starting increase position (S _T ) via the first lever 1a, which makes it difficult to start the engine.

Therefore, the present applicant previously proposed a centrifugal governor shown in FIG. 3 in order to eliminate the above-mentioned inconvenience (Japanese Patent Application No. 7-201973, hereinafter referred to as a previously proposed example). In the previously proposed example, as shown in FIG. 3, a lever limiting pin 13 that faces the first lever 1a and is capable of moving forward and backward is provided, and the lever limiting pin 13 is retracted at the time of engine start operation with low hydraulic pressure. Therefore, the rack pin 5 can be positioned at the start-up increasing position S _T via the first lever 1a, and in the overload operation state, the case body 12 is adjusted to move forward and backward to adjust the protruding amount of the lever limiting pin 13. Adjust,
By restricting the swing of the first lever 1a toward the fuel increase side R, the protrusion amount of the torque pin 3a of the torque increasing device 3 is adjusted. As a result, it is possible to freely regulate the amount of torque increase during engine operation.

[0006]

However, in the above-mentioned proposed example, since the lever limiting pin 13 which is moved forward and backward by hydraulic pressure is provided, the structure for regulating the amount of torque increase is complicated and the cost is rather increased. . The present invention takes such a situation into consideration, and provides a centrifugal governor that does not need to severely control the tolerance of the protrusion amount of the torque pin of the torque increasing device and can regulate the torque increasing amount during engine operation. In addition, it is possible to position the rack pin at the starting amount increasing position through the first lever at the time of starting the engine, and to simplify the configuration for regulating the amount of torque increase to reduce the cost. It is an issue.

[0007]

The present invention has the following basic configuration. That is, the rack pin 5 of the fuel injection pump 6
Is elastically pressed toward the fuel increasing side R via the speed adjusting lever 7 by the starter spring 2 hooked on the first lever 1a and the governor spring 8 hooked on the second lever 1b. Is configured to be pressed to the fuel reduction side L by the first lever 1a during the engine starting operation.
Via oppressed configured to be able to start increasing position Rakkupin 5 at a tension of start spring 2 (S _T), in the overload operation state of the engine, the Rakkupin 5 via a first lever 1a by the torque-up device 3 total Load equivalent position (4 /
4) From the torque-up position (T _U ) to the adjustment range.

In order to achieve the above object, the present invention has the following characteristic configurations. That is, the swing fulcrum P of the cooperation rod 14 is mounted on the speed control lever 7, and the other end of the cooperation rod 14 is slidably mounted on the pivot guide 15 provided on the first lever 1a. . Further, a rod restricting tool 16 is provided so as to be able to move forward and backward so as to face the cooperation rod 14, and the swinging of the cooperation rod 14 toward the fuel increase side R is regulated by the rod restricting tool 16 to regulate the engine. The amount of protrusion of the torque pin 3a of the torque increasing device 3 in the load operating state is adjustable.

[0009]

The centrifugal governor of the present invention operates as follows, as shown in FIG. 1, for example. When the engine is started, by positioning the speed control lever 7 at the idle rotation position A, the linking rod 14 is largely separated from the rod restricting tool 16 as shown by an imaginary line, and the rack pin 5 is moved by the first lever 1a. The tension of the start spring 2 elastically presses the start increasing position (S _T ) to facilitate the start.

After the engine is started, the rod restraint 16 is adjusted forward and backward to regulate the swinging of the link rod 14 toward the fuel increase side R, whereby the torque increase device 3 of the above-described torque increase device 3 in the engine overload operation state is controlled. The amount of protrusion of the torque pin 3a can be adjusted. As a result, the torque pin 3a of the torque increasing device 3 need only have a predetermined length.

[0011]

Since the present invention is constructed and operates as described above, it has the following effects. It is not necessary to strictly manage the tolerance of the amount of protrusion of the torque pin of the torque increasing device, and the amount of torque increasing can be regulated during engine operation. When the engine is started, the rack pin can be located at the starting amount increasing position via the first lever. Since only the cooperation rod 14 and the rod restricting tool 16 are provided as the structure for regulating the amount of torque increase, the structure is simple and the cost can be reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view schematically showing an embodiment of a centrifugal governor of the present invention, and FIG. 2 is a front view of the centrifugal governor shown by breaking a governor case. This centrifugal governor has the same basic structure as the conventional example of FIG. That is, the governor weight 18 and the start spring 2 are interlockingly connected to the rack pin 5 of the fuel injection pump 6 of the diesel engine via the first lever 1a. Further, the speed adjusting lever 7 is connected to the second lever 1b via the governor spring 8 so that the tension of the governor spring 8 can be adjusted by the speed adjusting lever 7.

That is, the start pin 2 and the governor spring 8 elastically press the rack pin 5 toward the fuel amount increasing side R, while the governor force G of the governor weight 18 causes the rack pin 5 to decrease the fuel amount side through the first lever 1a. L
It is configured to press. In addition, the second lever 1b
Is configured to be restricted to a position corresponding to the full load (4/4) by the fuel limiter 9, and the torque increase device 3 includes the first
It is interposed between the lever 1a and the second lever 1b.

With the above structure, the centrifugal governor operates in the same manner as the conventional example in the rated load rotation range and the overload rotation range of the engine. That is, in the rated load rotation range, the first lever 1a and the second lever 1b are in close contact with each other via the torque-up device 3, and the balance of the governor force G against the governor spring 8 and the start spring 2 causes The rack pin 5 is positioned in the metering range between the no-load equivalent position (0/4) and the full-load equivalent position (4/4) via the lever 1a to maintain the engine at a constant rotation speed. Further, in the overload rotation range, the torque pin 3a of the torque increasing device 3 projects so that the first lever 1a moves to the fuel increase side R and the rack pin 5 is moved to the full load equivalent position (4 /
4) Adjust the torque within the adjustment range between the torque-up position (T _U ).

The characteristic structure of the present invention will be described below. In the centrifugal governor of the present invention, as shown in FIGS. 1 and 2, the swing guide P of the linkage rod 14 is mounted on the speed control lever 7 and the pivot guide provided at the other end of the first lever 1a. The other end of the cooperation rod 14 is pierced by 15 and slidably mounted. The pivot guide 15 itself is rotatable about an axis perpendicular to the plane of FIG. 1 and has a through hole for the cooperation rod 14.

Further, the link rod 14 is attached to the governor wall 28.
A rod regulation tool 16 for regulating the swinging of the fuel consumption side R to a position corresponding to the torque increase is provided so as to be adjustable forward and backward, and the tip of the rod regulation tool 16 faces the cooperation rod 14. In addition, it is desirable that the tip shape of the rod restrictor 16 be appropriately changed in accordance with the form of the cooperation rod 14. As described above, in the present invention, since only the cooperation rod 14 and the rod restricting tool 16 are provided as the structure for regulating the amount of torque increase, the configuration is simplified and the cost can be reduced.

When the engine is started, the speed control lever 7
Is positioned at the idle rotation position A, the linkage rod 14 is largely separated from the rod restricting tool 16 as shown by an imaginary line, and the rack pin 5 is actuated by the tension of the start spring 2 via the first lever 1a to increase the starting amount increase position ( S _T ) suppresses the pressure and makes starting easier. Also, after starting the engine,
In the overload operation state, the rod restraint 16 is adjusted back and forth to the position corresponding to the torque increase, and after the adjustment is finished, it is fixed with the lock nut 18.

That is, by regulating the swing of the link rod 14 toward the fuel increase side R, the torque pin 3a of the torque increasing device 3 in the engine overload operation state.
The amount of protrusion of can be adjusted. As a result, the torque pin 3a of the torque increasing device 3 need only have a predetermined length. Therefore, it is not necessary to strictly manage the tolerance of the protrusion amount of the torque pin of the torque increasing device, and the torque increasing amount can be regulated during engine operation.

[Brief description of drawings]

FIG. 1 is a schematic view schematically showing a centrifugal governor according to an embodiment of the present invention.

FIG. 2 is a front view of the centrifugal type governor showing the governor case in a broken manner.

FIG. 3 is a schematic view schematically showing a centrifugal governor according to the previously proposed example.

FIG. 4 is a diagram corresponding to FIG. 2 of a centrifugal governor according to a conventional example.

[Explanation of symbols]

1a ... first lever, 1b ... second lever, 2 ... start spring, 3 ... torque increasing device, 3a ... torque pin,
5 ... Rack pin, 6 ... Fuel injection pump, 7 ... Governor lever, 8 ... Governor spring, 9 ... Fuel limiter, 14 ... Link rod, 15 ... Pivot guide, 16 ... Rod restrainer, 18 ... Governor weight, 28 ... Governor machine wall, 4/4
... full load corresponding position, G ... governor force, the swing fulcrum of P ... cooperation rods, R ... fuel increase side, L ... fuel increase side, S _T ... starting bulking position, T _U ... torque-up position.

Claims (1)

[Claims] 1. A starter spring (2) hooked to a first lever (1a) and a governor spring (8) hooked to a second lever (1b) of a rack pin (5) of a fuel injection pump (6). The elastic force is applied to the fuel increase side (R) via the speed control lever (7), while the governor force (G) is applied.
It is configured to be pushed toward the fuel reduction side (L) by means of, and at the time of the engine starting operation, the rack pin (5) is pushed by the tension of the start spring (2) through the first lever (1a) to the starting increasing position ( _ST ). When the engine is overloaded, the rack pin (5) is moved from the full load equivalent position (4/4) to the torque increase position (4/4) via the first lever (1a) by the torque increasing device (3). In a centrifugal governor of a diesel engine configured to perform adjustment within a adjustment range up to T _U ), a swing fulcrum (P) of a linkage rod (14) is attached to the speed adjustment lever (7), The pivot rod (15) provided on the first lever (1a) is attached to the cooperation rod (1).
The other end side of 4) is slidably mounted, and the above-mentioned cooperation rod (1
4) The rod restraint (16) is provided so as to be capable of advancing and retreating, and the swing of the cooperation rod (14) toward the fuel increase side (R) is regulated by the rod restraint (16). A centrifugal governor for a diesel engine, characterized in that the amount of protrusion of the torque pin (3a) of the torque increasing device (3) in an engine overload operation state is adjustable.