JPS6345431A - Mechanical governor for internal combustion engine - Google Patents

Abstract

PURPOSE:To stabilize the rotation during low speed rotation and to maintain high output during high speed rotation, by providing an idle spring device at a tension lever section which faces against a governor force receiving section of a governor lever. CONSTITUTION:A governor lever shaft 17 is provided while being shifted further to a control rack 20 side than a tension lever shaft 4. The control rack 20 is interlocked to one arm section of the governor lever 7 and the other arm section is employed as a governor force receiving section 26. An idle spring device 28 is provided in a recess 27 of a tension lever 8 which faces against the governor force receiving section 7a. During low speed rotation, the governor lever rotates to compress the idle spring, while during high speed rotation, the governor lever and the tension lever rotate integrally. Consequently, the rotation is stabilized during low speed rotation while high output can be maintained during high speed rotation.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a governor device for an internal combustion engine.

(Prior art and its problems) Conventionally, the governor lever, which receives the governor force and transmits it to the fuel increase/decrease rack, and the tension lever, which is biased toward the fuel increase side by the governor spring, are rotatably supported on the same axis. .

With the above structure, the lever ratio of the governor lever, that is, the ratio of the distance from the rack acting part to the pivot point and the distance from the governor force receiving part to the pivot point, is always constant regardless of whether it rotates at high speed or low speed.

Therefore, if the governor lever ratio is set high for high-speed rotation, for example, there will be a problem with the rotational stability during low-speed rotation, while if it is set low for low-speed rotation, sufficient output may not be obtained at high speed rotation.

(Objective of the Invention) The present invention stabilizes rotation during low speed rotation and maintains high output during 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 Object) In order to achieve the above object, the present invention provides a tension lever that is rotatable around a tension lever shaft, and a governor spring is connected to the tension lever to bias it toward 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 is rotatably attached to the governor lever shaft.
One arm of the governor lever is interlocked and connected to the fuel increase/decrease control rack, and the other arm is used as a governor force receiving section.An idle spring device is provided on the tension lever section facing the governor force receiving section, and the tension is adjusted at low speeds. The governor lever rotates around the governor lever axis relative to the lever to compress the idle spring device, and the tension lever and the governor lever rotate together around the tension lever axis at high speeds.

(Example) FIG. 1 shows a longitudinal cross-sectional view of a governor device according to the present invention. In FIG. supports the governor sleeve 6 so as to be freely movable in the axial direction, and
A governor weight 5 is rotatably supported on the support 12 via a support shaft 14. The governor weight 5 comes into contact with the governor sleeve 6, and as the rotational speed of the camshaft 11 increases, the governor weight 5 expands with the centrifugal horn, and the governor sleeve 6
It is designed to push out the moe.

A tension lever shaft 4 that is approximately perpendicular to the cam shaft 11 is fixed in the governor case 3 at a position slightly above the cam @ 1111. A tension lever 8 is rotatably supported.

A governor lever shaft 17 parallel to the tension lever shaft 4 is fixed to a portion of the tension control lever located above the tension lever shaft 4 and on the control rack side, and a governor lever 7 is rotatably supported on the governor lever shaft 17. There is.

A fuel increase/decrease control rack 2o is pivotally connected to the upper end of the governor lever 7 via a telescopic link 9/19. are meshed with each other. A shifter 26 is fixed to a lower end portion (force receiving portion) 7a of the governor lever 7, and the shifter 26 contacts the governor sleeve 6 via a thrust bearing 6a to receive governor force from the governor sleeve 6.

The tension lever 8 is formed into an inverted rLJ shape, and a governor spring 10 is stretched between its rear upper end and the front end of the inner accelerator control lever 22. It is biased towards the side. The control lever 22 is fixed to the control shaft 24, and the control lever 22 is fixed to the control shaft 24, and the control lever 22 is
24 is rotatably supported by the governor case 3, and
It extends outside the governor case 3.

The lower end of the tension lever 8 faces the force-receiving portion 7a of the governor lever 17 from the front with an open space therebetween.
Four parts 27 are formed in the shape of a frontage at the rear end, and inside the four parts 27 is a starting fuel increaser/idle spring 28 that protrudes rearward.
is arranged, and the rear end portion of the idle spring 28 is in contact with the lower end portion 7a of the governor lever 7. That is, a start spring 28 is compressed between the lower end of the tension lever 8 and the lower end of the governor lever 7, thereby biasing the governor lever 7 toward the fuel increase side to ensure a fuel increase stroke at the time of starting.

Also, an Angleich spring device 30 is screwed onto the lower end of the tension lever 8 above the start spring 28 at t, and the Angleich spring 42 inside the device 30 urges the bin 43 backward. death,
The rear end of the bin 43 faces the front end of the shifter 26 at a distance.

31 is a fuel limiter, and a torque spring 31b
The bottle part 31a, which has a built-in J3 and is biased rearward by a torque spring 31b, opposes the front edge of the tension lever 8, and limits the maximum simultaneous movement amount of the tension control lever 8 in the fuel increasing direction.

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 a hole 15 through which the tension lever shaft 4 is inserted is formed in the left and right portions of the governor lever 7. , there is a certain gap d between the hole 15 and the tension lever shaft 4. That is, the governor lever 7 is configured to be movable relative to the tension lever shaft 4 within a maximum range of 2d in a direction perpendicular to the axial direction.

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

In FIG. 3 showing the link t[19 that connects the governor lever 7 and the control rack 20, the link mechanism 19
is composed of a front cylindrical member 33, a rear rod member 34, and a tension spring 4o. The cylindrical member 33 is pivotally connected to the lower 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. The rod is U-connected and fitted into the cylindrical member 33 so as to be movable in the rod length direction. The front end of the tension spring 4o engages with the front air vent hole 33a of the cylindrical member 33, and the rear end of the tension spring 40 engages with the stop lever pin 41 at the rear end of the rod member. Rod member 34
and is maintained in a contracted state. Reference numeral 37 is a spring for removing backlash, and the spring force is extremely small, urging the control rack 20 forward.

The stop lever bin 41 is connected to the control rack 20
The stop lever 50 is in contact with the stop lever 50 from the front side. The stop lever 50 is fixed to a stop lever shaft 51 as shown in FIG.
1 is rotatably supported by the governor case 3 and extends upward, with a stop handle 52 attached thereto. That is, by rotating the stop lever 50 backward, the third
Only the control rack 20 can be rotated toward the fuel depletion side against the tension spring 40 shown in the figure.

Next, the operation will be explained. Before starting the engine, when the control lever 22 pulls the tension lever 8 via the governor spring 10 in a state where no governor force is applied to the shifter 26, the tension lever 8 comes into contact with the fuel limiter 31, but the lower end of the governor lever 7 The portion 7a is pushed rearward by the starting fuel increase/idle spring 28, thereby ensuring an increase in the amount of fuel at the time of starting and facilitating starting.

Immediately after the first engine start, the set load of the idle spring 28 still ensures the fuel increase a at the time of start. Fourth
The section in the figure is x1.

When the governor case begins to overcome the elastic force of the idle spring 28, the governor lever 7 receives a small governor force, resists the idle spring 28, and rotates relative to the tension lever 8. It rotates around the axis O' of the governor lever shaft 17. Therefore, the governor lever ratio is small, L2° in Figure 1.
/ Li.

becomes. The section in FIG. 4 is x2.

Also, during idle rotation, the governor lever 7 receives a small governor force, resists the idle spring 28, and rotates relative to the tension lever 8. At this time, the governor lever 7 rotates around the center O' of the governor lever shaft 17. Rotate.

Therefore, the governor lever ratio is small, 2'/Ll in Figure 1.

becomes. It is a graph of A1 in FIG. 4.

When the rotation increases after a separate start and the governor force increases, the front end of the shifter 26 comes into contact with the rod 43 of the Angleich spring device 30, and the governor lever 7 is prevented from rotating due to the set load of the Angleich spring 42. Fuel remains constant. This is section X3 in FIG.

The Angleich spring 42 is then compressed.

The section in FIG. 4 is x4. At this time, the governor lever 7 rotates around the axis O' of the governor lever shaft 17, so the governor lever ratio is small, which makes it easy to make fine adjustments when creating (setting) the limiting torque characteristics using the Angleich spring 42. can be done.

When the lower end portion 7a of the governor lever comes into contact with the rear end portion of the tension lever 4, the rotation of the governor lever 7 in the fuel decreasing direction is temporarily prevented by the let load of the governor spring 10. The section in FIG. 4 is x5.

As the rotation speed increases and the governor force increases,
The governor lever 7 and the tension lever 8 rotate integrally about the axis 0 of the tension lever shaft 4 in the fuel depletion side against the governor spring 10. Section in Figure 4×
It is 6. Therefore, the lever ratio at this time is 12/L1, which is larger than the lever ratio L2'/Ll° at the time of low speed rotation mentioned above.

When the engine is to be stopped urgently during high-speed operation, the stop lever 50 is rotated rearward using the stop handle 52. Then, the control rack 20 rotates toward the fuel depletion side against the elastic force of the tension spring 40 of the link line groove 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° during low-speed rotation immediately after engine startup or during idling, so the governor weight 5 is The tl+1 moment of the control rack 20 with respect to the centrifugal force increases, and the centrifugal force of the governor weight 5 can be used effectively.
It is possible to obtain sufficient low-speed rotation performance.

On the other hand, at high speeds, the governor lever ratio is 2/L1, which is larger than at low speeds, and the response of control rack 20 to governor force becomes more sensitive, maintaining good control performance at high speeds. can.

(Effects of the Invention) As explained above, according to the present invention: (1) During low speed rotation or idle rotation, the governor lever 7 rotates around the axis O' of the governor lever shaft 17, so the governor lever ratio is small. By increasing the rack Lll dynamic moment relative to the centrifugal force of the governor weight 5, the centrifugal force of the governor weight 5 can be effectively utilized, and rotational stability during low-speed rotation is improved. Such an I valve is most suitable for a marine engine with a low standard rotational speed.

(2) At high speed, the governor lever 7 is the tension lever 8
Since the tension lever rotates integrally with the tension lever shaft 60, the governor lever ratio becomes larger than at low speeds, the response of the fuel increase/decrease control rack 20 becomes more sensitive, and high output at high speeds can be maintained satisfactorily.

(3) Since the idle spring 28 is provided on the tension lever 8 and is configured to be compressed between the tension lever 8 and the governor lever 7, the tension lever 8 and the governor lever 7 resist against the governor spring 10 during high speed rotation. When rotating integrally, idle spring 2
8 does not work.

Therefore, the rotation speed of the governor spring 10 can be set accurately.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the mechanical governor according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a partial view taken in the direction of the ■ arrow in Fig. 2, and Fig. 4 is a timing diagram for fuel injection. It is a sex diagram. 3... Governor case, 4... Tension lever shaft, 7... Governor lever, 7a126... Lower end, shifter (governor force receiving part), 8... Tension lever, 10...
...Governor spring, 17...Governor lever shaft, 2
0... Fuel increase/decrease control rack, 28... Idle spring Patent applicant Yanmar Diesel Co., Ltd. Figure 1 Figure 3

Claims (3)

[Claims] (1) A tension lever is rotatably provided on the tension lever shaft, and a governor spring is connected to the tension lever to bias it toward the fuel increase side, and the governor lever shaft, which is eccentric from the tension lever shaft toward the fuel increase/decrease control rack side, is tensioned. A governor lever is rotatably provided on the governor lever shaft, one arm of the governor lever is interlocked and connected to the fuel increase/decrease control rack, and the other arm serves as the governor force receiving section, facing the governor force receiving section. An idle spring device is installed in the tension lever part, and at low speeds, the governor lever rotates around the governor lever axis relative to the tension lever, compressing the idle spring device, and at high speeds, the tension lever and governor lever are integrated around the tension lever axis. What is claimed is: 1. A governor device for an internal combustion engine, characterized in that the governor device is configured to rotate as shown in FIG. (2) An Angleich spring device is provided in the tension lever portion facing the governor force receiving portion, and the rod of the Angleich spring device is installed so that the Angleich spring device is compressed after the idle spring device is compressed by a certain amount. The governor device for an internal combustion engine according to claim 1, wherein the governor force receiving portion is opposed to the governor force receiving portion at a distance. (3) Connecting the governor lever and the fuel increase/decrease control rack via a telescopic link mechanism, holding the link mechanism in a shortened state by a stopper spring, and engaging the stop lever with the fuel increase/decrease control rack;
3. A governor device for an internal combustion engine according to claim 1, wherein the stop lever is configured to move only the fuel increase/decrease control rack toward the fuel decrease side against the stopper spring.