JPH07101009B2 - Mechanical governor device for internal combustion engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a governor device for an internal combustion engine.

(Prior Art and Problems Thereof) A governor lever that receives a governor force and transmits it to a fuel increase / decrease rack and a tension lever that is biased toward the fuel increase side by a governor spring are rotatably supported on the same axis center. .

In the structure as described above, the lever ratio of the governor lever, that is, the ratio of the distance from the rack acting portion to the pivotal fulcrum and the distance from the governor force receiving portion to the pivotal fulcrum is always constant during both high speed rotation and low speed rotation. Therefore, if the governor lever ratio is set large for high speed rotation, the stability of the rotation remains low at low speed rotation, whereas if it is set low for low speed rotation, sufficient output may not be obtained at high speed rotation.

(Object of the Invention) The present invention stabilizes rotation at low speed rotation and maintains high output at high speed rotation by automatically changing the lever ratio of the governor lever between low speed rotation and high speed rotation. It is an object.

(Means for Achieving the Purpose) In order to achieve the above object, the present invention provides a tension lever rotatably on a tension lever shaft, and a governor spring is connected to the tension lever to urge the fuel increase side.
The tension lever is equipped with a governor lever shaft that is eccentric to the fuel increase / decrease control rack side than the tension lever shaft, and the governor lever shaft is rotatably equipped with a governor lever.
One arm of the governor lever is linked to the fuel increase / decrease control rack and the other arm is used as a governor force receiving portion, and an idle spring device is provided on the tension lever portion facing the governor force receiving portion. With respect to the lever, the governor lever rotates around the governor lever shaft to compress the idle spring device, and at high speed, the tension lever and the governor lever rotate integrally around the tension lever shaft.

(Embodiment) FIG. 1 is a vertical sectional view of a governor device according to the present invention. In FIG. 1, a camshaft 11 for operating a fuel injection pump extends into a governor case 3 and a tip portion thereof. The governor sleeve 6 is supported movably in the axial direction, and the governor weight 5 is rotatably supported by the support 12 via the support shaft 14. Governor weight 5 is governor sleeve 6
The governor weight 5 is expanded by centrifugal force due to an increase in the number of rotations of the cam shaft 11, and the governor sleeve 6 is pushed forward.

In the governor case 3, a tension lever shaft 4 which is substantially perpendicular to the cam shaft 11 is fixed at a position slightly above and above the cam shaft 11, and the tension lever shaft 4 has a pair of left and right bearings 13 interposed therebetween. The tension lever 8 is rotatably supported.

A governor lever shaft 17 parallel to the tension lever shaft 4 is fixed to the tension lever portion above the tension lever shaft 4 (position on the control rack side).
The governor lever 7 is rotatably supported on the governor lever shaft 17.

A fuel increase / decrease control rack 20 is pivotally connected to an upper end portion of the governor lever 7 via an expansion / contraction link mechanism 19, and the fuel increase / decrease control rack 20 extends toward the fuel injection pump 1 side to form a fuel increase / decrease pinion of the fuel injection pump 1. It is in mesh. A shifter 26 is fixed to the lower end portion (force receiving portion) 7a of the governor lever 7, and the shifter 26 abuts the governor sleeve 6 via the thrust bearing 6a to receive the governor force from the governor sleeve 6. The tension lever 8 is formed in an inverted "L" shape, and a governor spring 10 is stretched between a rear upper end portion thereof and a front end portion of a front inner accelerator control lever 22. Is being urged to increase fuel. Control lever 22 is the control axis
The control shaft 24 is fixed to 24, is rotatably supported by the governor case 3, and extends to the outside of the governor case 3.

The lower end of the tension lever 8 is the force receiving portion of the governor lever 17.
A recess 27 having an opening at the rear end is formed facing the 7a at a distance from the front, and a rear projecting starter fuel increase / idle spring 28 is arranged in the recess 27. The rear end portion is in contact with the lower end portion 7a of the governor lever 7. 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 governor lever 7, thereby urging the governor lever 7 toward the fuel increasing side and ensuring the fuel increasing stroke at the time of starting.

Also, at the lower end of the tension lever 8 and above the start spring 28, there is an Angleich spring device.
30 is screwed, the pin 43 is biased rearward by an Angleich spring 42 in the device 30, and the rear end of the pin 43 opposes the front end of the shifter 26 at a distance. There is.

Reference numeral 31 denotes a fuel limiter, which has a built-in torque spring 31b. The pin portion 31a biased rearward by the torque spring 31b faces the front end edge of the tension lever 8 so that the tension lever 8 rotates in the maximum fuel increasing direction. Limit the amount of movement.

In FIG. 2, a pair of left and right lever portions of the governor lever 7 are integrally connected by the lower end portion 7a, and holes 15 through which the tension lever shaft 4 is inserted are formed in the left and right portions of the governor lever 7. A constant clearance (play) d is provided between the hole 15 and the tension lever shaft 4.
That is, the governor lever 7 is configured to be movable with respect to the tension lever shaft 4 in the range of 2d at the maximum in the direction perpendicular to the axial direction.

An outer control lever 25 is fixed to the end of the control shaft 24 outside the case.

In FIG. 3 showing a link mechanism 19 connecting the governor lever 7 and the control rack 20, the link mechanism 19 is composed of a front cylinder member 33, a rear rod member 34 and a tension spring 40. The tubular member 33 is pivotally connected to the upper end of the governor lever 7 via a pin 35, and the rod member 34 is pivotally connected to the control rack 20 via a pin 38.
It is fitted in the tubular member 33 so as to be movable in the rod length direction.
The front end of the tension spring 40 has a front air vent hole 33a in the tubular member 33.
, The rear end of the tension spring 40 engages with the stop lever pin 41 at the rear end of the rod member, thereby maintaining the tubular member 33 and the rod member 34 in a contracted state. Reference numeral 37 is a rattling spring, which has a very small spring force and urges the control rack 20 forward.

The stop lever pin 41 is fixed to the control rack 20, and the stop lever 50 contacts from the front side. The stop lever 50 is fixed to a stop lever shaft 51 as shown in FIG. 2, and the stop lever shaft 51 is rotatably supported by the governor case 3 and extends upward.
It has a stop handle 52. Ie stop lever
The tension spring 40 shown in FIG.
It is possible to rotate only the control rack 20 toward the fuel reduction side against the above.

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 comes into contact with the fuel limiter 31, but the lower end portion of the governor lever 7. 7a is pushed rearward by the starting fuel amount increase / idle spring 28, thereby ensuring the fuel amount increase at the time of starting and facilitating the starting.

Immediately after the engine starts, the set load of the idle spring 28 still ensures the fuel increase at the start. This is section X1 in FIG.

When the governor force begins to overcome the elastic force of the idle spring 28, the governor lever 7 receives a small governor force and resists the idle spring 28 and rotates relatively to the tension lever 8. At this time, the governor lever 7 moves. It rotates about the axis O'of the shaft 17. Therefore, the governor lever ratio is small and L2 '/ L1' in Fig. 1 is used.
Becomes This is the section X2 in FIG.

Even during idle rotation, the governor lever 7 receives a small governor force and resists the idle spring 28 and rotates relatively to the tension lever 8. At this time, the governor lever 7 is centered on the axis O'of the governor lever shaft 17. Rotate as. Therefore, the governor lever ratio is small and
It becomes L2 '/ L1'. It is a graph of A1 in FIG.

When the rotation increases after the engine is started and the governor force increases, the front end of the shifter 26 contacts the rod 43 of the Angleich spring device 30, and the set load of the Angleich spring 42 prevents the governor lever 7 from rotating, and Is kept constant. This is section X3 in FIG.

The Angleich spring 42 is then compressed. This is section X4 in FIG. At this time, the governor lever 7 is the governor lever shaft.
Since the axis O'of 17 is rotated about the rotation center, the governor lever ratio is small, and therefore, fine adjustment can be easily performed when the limiting torque characteristic is created (set) by the Angleich spring 42.

When the lower end portion 7a of the governor lever contacts the rear end portion of the tension lever 4, the set load of the governor spring 10 temporarily prevents the governor lever 7 from rotating in the fuel reducing direction.
This is section X5 in FIG.

When the speed is increased and the governor force is increased,
Against the governor spring 10, the governor lever 7 and the tension lever 8 integrally rotate toward the fuel reducing side with the axis 0 of the tension lever shaft 4 as the center of rotation. This is section X6 in FIG. Therefore, the lever ratio at this time is L2 / L1, which is larger than the above-described lever ratio L2 '/ L1' during low speed rotation.

When the engine is to be stopped urgently during high-speed operation, the stop handle 52 rotates the stop lever 50 rearward. Then, the control rack 20 rotates toward the fuel reduction side against the elastic force of the tension spring 40 of the link mechanism 19, reaches the fuel stop position, and stops the engine. At this time, the governor lever 7 does not move.

When comparing the above-mentioned low speed rotation and high speed rotation, the governor lever 7 acts at a small lever ratio L2 ′ / L1 ′ at the time of low speed rotation immediately after the engine is started or at the time of idle rotation. The braking moment of the control rack 20 against the centrifugal force becomes large, the centrifugal force of the governor weight 5 can be effectively used, and stable low-speed rotation performance can be obtained.

On the other hand, at high speed rotation, the governor lever ratio becomes L2 / L1, which is larger than at low speed, and the response of the control rack 20 to the governor force becomes sensitive, and good control function at high speed can be maintained.

(Advantages of the Invention) As described above, according to the present invention: (1) During low speed rotation or idle rotation, the governor lever 7 rotates about the axis O'of the governor lever shaft 17, so that the governor lever ratio is small. Therefore, the rack braking moment with respect to the centrifugal force of the governor weight 5 is increased, so that the centrifugal force of the governor weight 5 can be effectively utilized, and the stability of rotation at low speed rotation is improved. Such an engine is most suitable for a marine engine having a low standard rotation speed.

(2) At high speed, the governor lever 7 is the tension lever 8
Since it rotates integrally with the tension lever axis O, the governor lever ratio becomes larger than that at low speed, the response of the fuel increase / decrease control rack 20 becomes sensitive, and high output at high speed can be favorably maintained.

(3) Since the idle spring 28 is provided in the tension lever 8 and is configured to compress between the tension lever 8 and the governor lever 7, the tension lever 8 and the governor lever 7 resist the governor spring 10 during high speed rotation. The idle spring 28 does not operate when integrally rotated.

Therefore, it becomes possible to accurately set the rotation speed by the governor spring 10.

[Brief description of drawings]

1 is a longitudinal sectional view of a mechanical governor according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a partial view taken along the arrow III of FIG. 2, and FIG. 4 is a fuel injection amount. It is a characteristic diagram. 3 …… Governor case, 4 …… Tension lever shaft, 7 …… Governor lever, 7a, 26 …… Lower end, Shifter (Governor force receiving part), 8 …… Tension lever, 10 …… Governor spring, 17 …… Governor lever shaft, 20 …… Fuel increase / decrease control rack, 28 …… Idle spring

Claims (3)

[Claims] 1. A governor lever shaft, wherein a tension lever is rotatably provided on a tension lever shaft, and a governor spring is connected to the tension lever to urge it toward a fuel increase side and to be eccentric to the fuel increase / decrease control rack side with respect to the tension lever shaft. Is equipped with a tension lever, the governor lever shaft is rotatably equipped with a governor lever, one arm of the governor lever is interlockingly connected to the fuel increase / decrease control rack, and the other arm is the governor force receiving portion. The idler spring device is installed on the tension lever part facing to, and the governor lever rotates around the governor lever shaft to compress the idler spring device against the tension lever at low speed, and at high speed the tension lever and governor lever are integrated around the tension lever shaft. Configured to rotate automatically Governor for an internal combustion engine characterized by Rukoto. 2. An Angleich spring device is provided in a tension lever portion facing a governor force receiving portion, and the Angleich spring device is compressed so that the idle spring device is compressed by a predetermined amount. The governor device for an internal combustion engine according to claim 1, wherein the rod is opposed to the governor force receiving portion with a space therebetween. 3. A governor lever and a fuel increase / decrease control rack are connected via an expandable link mechanism, the link mechanism is held in a shortened state by a stopper spring, and a stop bar is engaged with the fuel increase / decrease control rack. 3. The governor device for an internal combustion engine according to claim 1 or 2, wherein the stop lever is configured to move only the fuel increase / decrease control rack to the fuel decrease side against the stopper spring.