JP2565681B2 - Mechanical governor for diesel engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mechanical governor for a diesel engine.

(Prior art and its problems) An Angleich device provided in this type of governor is configured to energize the governor lever in the fuel increasing direction when the engine speed decreases and to energize the fuel decreasing direction when the engine speed increases. ing. Therefore, in the conventional Angleich apparatus, a curve as indicated by the imaginary line A1 in FIG. 5 is obtained.

However, during the acceleration of the engine, particularly in an engine equipped with a supercharger, the pressure increase by the supercharger turbine is delayed with respect to the increase in the rotation speed, that is, the supercharge is delayed, and the fuel air is insufficient. At this time, if a large amount of fuel is supplied as shown in the graph A1 in FIG. 5, black smoke will be generated in the section X3.

Further, if the fuel supply amount in the section X3 is lowered to the predetermined rack position T as shown in the graph A2, for example, in order to reduce the generation of black smoke, the fuel becomes insufficient at the rated rotation speed P, which causes the output shortage. Become.

(Object of the Invention) The object of the present invention is to surely prevent generation of black smoke during acceleration by providing the governor lever torque characteristic with an inverse Angleich characteristic, and it is sufficient when the speed is increased to the rated speed. It is necessary to supply necessary fuel to and maintain the output.

(Means for Achieving the Purpose) A governor lever includes a tension lever 8 biased toward the fuel increase side by a governor spring 10, a governor lever 7 interlockingly connected to a fuel increasing / decreasing rack 20, and a thrust lever 9 abutting against a governor sleeve 6. It is rotatably supported on the shaft 17,
A start spring 28 for urging the thrust lever 9 toward the fuel increase side is contracted between the thrust lever 9 and the tension lever 8, and is set between the governor lever 7 and the thrust lever 9 to overcome the sliding resistance of the rack 20. Spring 25
The governor lever 7 with the set spring 25.
The thrust lever 9 is engaged with the thrust lever 9 to allow the governor lever 7 to rotate toward the fuel increasing side only against the set spring 25, and the lower end of the tension lever 8 is connected to the Angleich device.
30 is provided, and the lifter 41 of the Angleich device 30 is connected to the shifter 26 of the thrust lever 9 by the Angleich spring 44.
By biasing the lifter 41 so that one end of the lifter 41 faces the shifter 26 with a space therebetween, the tension lever 8 is provided with a lifter lever 42 swingably, and one end of the lifter lever 42 is attached to the shifter 26. Lifter 41 from the side opposite to the 26 side
The other end of the lifter lever 42 to the other end of the governor lever 7, and when the lifter 41 moves, the lifter lever 42 swings to move only the governor lever 7 to the fuel increase side. I am trying to let you.

(Embodiment) FIG. 1 is a vertical sectional view of a mechanical governor according to the present invention. In FIG. 1, a camshaft 11 for operating a fuel injection pump extends into a governor case 3 and its tip end. The governor sleeve 6 is rotatably supported in the axial direction, and the governor weight 5 is rotatably supported by a support 13 via a support shaft 14. The governor weight 5 is in contact with the governor sleeve 6, and the governor weight 5 expands due to an increase in the number of rotations of the cam shaft 11 to push the governor sleeve 6 forward.

A governor lever shaft 17 that is substantially perpendicular to the cam shaft 11 is fixed to the governor case 3 at a position slightly higher than the cam shaft 11, and the governor lever 7, the tension lever 8, and the thrust lever 9 are rotatable on the governor lever shaft 17. It is supported by. A link 19 is pivotally connected to an upper end portion of the governor lever 7, and a fuel increase / decrease rack 20 is pivotally connected to a tip end portion of the link 19 so that the fuel increase / decrease rack 20 extends toward the fuel injection pump 1 side. It meshes with the fuel increase / decrease pinion 21 of 1.

The tension lever 8 is formed in an inverted "L" shape, and a governor spring 10 is stretched between the rear upper end and a front end of the front inner accelerator control lever 22.
Is being urged to increase fuel. The control lever 22 is fixed to the control shaft 24, and the control shaft 24 is rotatably supported by the governor case 3 and extends out of the governor case 3, and the outer end portion thereof has an outer control as shown in FIG. The lever 23 is fixed.

In FIG. 4 showing an exploded perspective view of the governor, the governor lever 7 is formed in an upward U-shape by a pair of left and right lever portions 7a and 7b and a planar connecting portion 7c integrally connecting the lower end portions thereof. Both lever portions 7a and 7b are rotatably supported by the governor shaft 17 via a bearing metal 39. That is, the governor lever 7 as a whole is supported by the governor shaft 17 in a cantilevered manner. As described above, one governor lever portion 7a extends upward and is pivotally connected to the link 19, and the other governor lever portion 7b has a protrusion 7d at the upper end front end thereof and a protrusion 9b at the upper end rear end of the thrust lever 9. A set spring 25 is stretched between the two, and the pulling force of the set spring 25 engages the upper end front end edge of the thrust lever 9 with the upper end protrusion 7d of the governor lever portion 7b. The spring strength of the set spring 25 is strong enough to overcome the sliding resistance of the rack 20. Therefore, the governor lever 7 can be rotated alone against the elastic force of the set spring 25 and independently on the fuel increase side. It is structured.

The thrust lever 9 is also formed in an upward U shape from a pair of left and right lever portions and a connecting portion 9a that integrally connects the lower end portions thereof, and the thrust lever 9 as a whole has both ends of the bearing metal 39. It is supported by the governor shaft 17 via the. A shifter is provided at the lower end connecting portion 9a of the thrust lever 9.
26 is fixed, and the rear end of the shifter 26 is a governor sleeve 6
It comes into contact with and receives the governor force.

In FIG. 2, a rear end opening-shaped recess 27 is formed in the lower end of the tension lever 8, a rear projecting start spring 28 is arranged in the recess 27, and the rear end of the start spring 28 is The connecting portion 9a of the thrust lever 9 is in contact. That is, the start spring 28 is contracted between the lower end portion of the tension lever 8 and the lower end portion of the thrust lever 9, whereby the thrust lever 9 is biased toward the fuel increasing side, and the fuel increasing stroke at the time of starting is secured. .

An Angleich device 30 having an Angleich characteristic is screwed to a lower end portion of the tension lever 8 above the start spring 28. Angleich equipment
The reference numeral 30 includes a bolt-shaped case 43, a lifter 41, an Angleich spring 44, and the like. The case 43 is screwed into the female screw hole of the tension lever 8, and the lifter is provided inside the case 43.
41 is fitted so that it can move back and forth. An Angleich spring 44 is contracted between the rear end flange portion of the lifter 41 and the front end cover portion 43a of the case 43, and the Angleich spring 44 biases the lifter 41 rearward.

The rear end surface of the lifter 41 is opposed to the front end edge of the shifter 26 with a space therebetween, and the front end edge of the lifter 41 penetrates the front lid portion 43 of the case 43 to project forward to convert to a reverse Angleich characteristic. It is in contact with the upper end of 42. Further, a stop ring 50 is fixed to the lifter 41, and the stop ring 50 abuts against the lid portion 43a, whereby the lifter 41
Is locked in the state shown in FIG.

The lifter lever 42 is swingably supported by a bracket 46 via a pin 45 parallel to the governor lever shaft 17 in FIG. 1, and is urged clockwise by a coil spring 47 in FIG. The upper end is a protruding lifter 41
Is in contact with The bracket 46 is fixed to the front end surface of the lower end portion of the tension lever 8 by a bolt 51 as shown in FIG. A contact bolt 49 is screwed to the lower end portion of the lifter lever 42 so that the rearward protrusion amount can be adjusted, and the contact bolt 49 abuts the lower end connecting portion 7c of the governor lever 7 from the front side. It can be pushed to the side.

Reference numeral 31 in FIG. 1 denotes a fuel limiter, which faces the front end edge of the tension lever 8 and limits the maximum rotation amount of the tension lever 8 in the fuel increasing direction.

The stop mechanism for stopping the engine includes a governor lever 7
A stop lever 32 is arranged on the front side of the stop lever 32, and the stop lever 32 is provided with a cam portion 32a having a semicircular cross section, and the cam portion 32a is provided on the upper half of the governor lever 7 and the tension lever 8 as shown in FIG. It faces the front edge. The stop lever 32 is rotatably supported by the governor case 3 and extends outside the governor case 3 to provide a stop handle.
Equipped with 36 in one. That is, by rotating the stop lever 32, the governor lever 7 and the tension lever 8 can be rotated toward the fuel reduction side.

Next, the operation will be described. When the tension lever 8 is pulled by the control lever 22 via the governor spring 10 while the governor force is not applied to the shifter 26 before the engine is started, the tension lever 8 contacts the fuel limiter 31, but the lower end of the thrust lever 9 The connecting portion 9a is pushed rearward by the start spring 28, and at the same time, the governor lever 7 is also set spring 25.
It is pulled to the fuel increase side via the, so that the fuel increase at the time of starting is secured and the starting becomes easy (X1 in Fig. 5
Section).

At the time of acceleration, the start spring 28 is first compressed, so that the fuel supply amount decreases from the start-up amount state (section X2 in FIG. 5). The amount of decrease at this time decreases until it becomes smaller than the fuel supply amount (rack position T) required at the rated rotation P.

When the shifter 26 of FIG. 2 contacts the lifter 41, the reduction of fuel stops, and only the number of revolutions increases until the set load of the Angleich spring 44 is overcome, and the rack 20 does not move. That is, it is the section X3 in FIG. 5, and in this section X3, the fuel supply amount is supplied to the eyes smaller than the predetermined rack position T, so that black smoke is not generated.

When the governor force begins to overcome the set load of the Angleich spring 44 as the number of revolutions further increases, the second
The illustrated lifter 41 moves forward and pushes the upper end of the lifter lever 42, thereby pushing the governor lever 7 in the fuel increasing direction via the abutment bolt 49 of FIG. At this time, the governor lever 7 independently rotates against the set spring 25 to the fuel increase side, and moves the rack 20 to the fuel increase side. That is, in FIG.
In the section of X4, the fuel increase / decrease rack 20 is returned to the predetermined rack position T.

At the rated speed P, the lower end connection 9a of the thrust lever 9 and the tension lever 8 come into contact with each other, and both levers 8 and 9 rotate integrally. That is, the rotational speed is controlled by the balance between the governor spring 10 and the thrust force of the sleeve 6. Further, the governor lever 7 rotates together with the thrust lever 9 via the tension of the set spring 25.

(Advantages of the Invention) According to the present invention as described above: The tension lever 8 biased toward the fuel increase side by the governor spring 10, the governor lever 7 interlockingly connected to the fuel increase / decrease rack 20, and the governor sleeve 6 are brought into contact with each other. The thrust lever 9 and the governor lever shaft 17 are rotatably supported,
A start spring 28 for urging the thrust lever 9 toward the fuel increase side is contracted between the thrust lever 9 and the tension lever 8, and is set between the governor lever 7 and the thrust lever 9 to overcome the sliding resistance of the rack 20. Spring 25
The governor lever 7 with the set spring 25.
The thrust lever 9 is engaged with the thrust lever 9 to allow the governor lever 7 to rotate toward the fuel increasing side only against the set spring 25, and the lower end of the tension lever 8 is connected to the Angleich device.
30 is provided, and the lifter 41 of the Angleich device 30 is connected to the shifter 26 of the thrust lever 9 by the Angleich spring 44.
By biasing the lifter 41 so that one end of the lifter 41 faces the shifter 26 with a space therebetween, the tension lever 8 is provided with a lifter lever 42 swingably, and one end of the lifter lever 42 is attached to the shifter 26. Lifter 41 from the side opposite to the 26 side
The other end of the lifter lever 42 to the other end of the governor lever 7, and when the lifter 41 moves, the lifter lever 42 swings to move only the governor lever 7 to the fuel increase side. Since this is done, there are the following advantages.

(1) Only the governor lever 7 is independently rotatable to the fuel increase side, and only the governor lever 7 is moved to the fuel increase side via the lifter lever 42 when the lifter 41 of the Angleich device 30 moves. The so-called reverse Angleich characteristic can be exhibited during acceleration. Therefore, when the fuel supply amount is reduced during acceleration to prevent the generation of black smoke during acceleration, it is possible to return the fuel to the predetermined supply amount by the reverse Angleich characteristic before reaching the rated rotation speed. High output can be maintained.

That is, it has an alternative characteristic of the booster compensator, and it is possible to reliably prevent the generation of black smoke during acceleration at the time of acceleration, sufficient fuel can be secured at the rated speed, and high output at the rated speed can be maintained. .

(2) Since the above-mentioned performance at the time of acceleration can be obtained only by providing the conventional Angleich device with the lifter lever 42 for reversing the load acting direction, the manufacturing component cost becomes easy.

(3) When the reverse Angleich is operated, only the governor lever 7 is rotated toward the fuel increasing side against the elastic force of the set spring 25 having a weak spring force, so that the operation performance of the reverse Angleich is smooth.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a mechanical governor according to the present invention, FIG. 2 is an enlarged sectional view of a II portion of FIG. 1, and FIG. 3 is III-I of FIG.
II sectional view, FIG. 4 is an exploded perspective view of the governor of FIG. 1, and FIG.
The figure is a graph showing the relationship between the rotation speed and the rack position.
3 ... Governor case, 6 ... Governor sleeve, 7 ... Governor lever, 8 ... Tension lever, 9 ... Thrust lever, 10 ... Governor spring, 17 ... Governor lever shaft, 20 ... Fuel increase / decrease rack, 25 ... ... set springs,
26 …… Shifter, 28 …… Start spring, 30 …… Angleich device, 41 …… Lifter, 42 …… Lifter lever, 44 …… Angraich spring

Claims (1)

(57) [Claims] 1. A tension lever (8) biased toward the fuel increase side by a governor spring (10), a governor lever (7) interlockingly connected to a fuel increase / decrease rack (20), and a governor sleeve (6). A start spring (2) that rotatably supports the thrust lever (9) on the governor lever shaft (17) and biases the thrust lever (9) toward the fuel increase side.
8) Put thrust lever (9) and tension lever (8)
And a set spring (25) that stretches over the sliding resistance of the rack (20) between the governor lever (7) and thrust lever (9). By engaging the governor lever (7) and the thrust lever (9), the governor lever (7) can be rotated to the fuel increase side only against the set spring (25), and the lower end of the tension lever (8) can be rotated. An Angleich device (30) is installed in the rear side of the lifter (41) by urging the lifter (41) of the Angleich device (30) toward the shifter (26) side of the thrust lever (9) by the Angleich spring (44). The lifter lever (42) is swingably provided on the tension lever (8), and one end of the lifter lever (42) is connected to the shifter (26). Opposite side To the other end of the lifter (41) and the other end of the lifter lever (42) to the end face of the governor lever (7) so that the lifter lever (42) moves when the lifter (41) moves. A mechanical governor for a diesel engine, characterized in that only the governor lever (7) is moved to the fuel increase side by rocking.