JPH01167420A - Accelerator operating power lightening device for diesel engine - Google Patents

Abstract

PURPOSE:To lighten the accelerator operating power by installing a slide rod opposed to a fuel reduction side onto a governor sleeve and attaching the governor sleeve onto the slide rod when the governor sleeve is projected in a high speed revolution region. CONSTITUTION:The slide rod 42 of an accelerator operating power lightening device 40 is arranged oppositely to a governor sleeve 6 from the fuel reduction side. When the governor sleeve is projected in the high speed region, the governor sleeve 6 is attached onto the slide rod 42, and the energy for reducing the stepping-on force is stored on a spring 43. When an accelerating pedal is stepped on, the return force of the spring 43 acts as the stepping-on force reducing power. Therefore, the accelerator operating power can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an accelerator operation force reduction device for a diesel engine.

(Conventional Technology Exhibition "Problems with it") In general, the governor mechanism of a diesel engine has a governor weight that can be freely expanded in the radial direction of the camshaft, and a governor weight that engages with the governor weight and moves to the fuel depletion side by expanding the governor weight. A moving governor sleeve is provided on a camshaft, and the governor sleeve is interlocked and connected to an accelerator device and a fuel increase/decrease rack via a governor link mechanism.

For example, when a diesel engine equipped with such a governor mechanism is installed in a vehicle, the accelerator operation force becomes very heavy when the accelerator is loosened and then depressed again in order to change gears during high-speed rotation.

In other words, during high-speed rotation, when the accelerator is loosened to suddenly reduce the load on the governor sleeve, the rotational speed itself does not suddenly drop, so the centrifugal force of the governor weight is large and the governor weight suddenly becomes fully open. . However, as the governor weight opens, the center of gravity shifts outward, so the centrifugal force increases rapidly as it moves toward the fully open side. Therefore, when stepping on the accelerator device again, the accelerator device must be pressed against the excessive centrifugal force of the governor weight near the fully open position, and the accelerator operation force becomes extremely heavy.

(Object of the invention) The object of the invention is to
The objective is to improve accelerator operability by reducing accelerator operating force.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention provides a governor sleeve with a slide rod facing from the fuel depletion side so as to be movable in the axial direction, and the slide rod is moved toward the governor by a biasing means. When the governor sleeve protrudes in a high-speed rotation range, the governor sleeve contacts the slide rod directly or indirectly through an intermediate member, and the slide rod moves toward the fuel depletion side against the biasing means. It is configured to press .

(Function) When the accelerator is loosened during high-speed rotation, the load from the accelerator on the governor sleeve is suddenly released, but the rotational speed itself does not drop suddenly, so the governor weight expands to the full opening side. The governor sleeve moves toward the fuel depletion side, and at this time, the governor sleeve directly or indirectly pushes the slide rod of the mitigation device against the biasing means and stores energy in the biasing means.

Therefore, when the accelerator is depressed again, the return force of the biasing means of the reducing device together with the accelerator operating force becomes a force that pushes the governor sleeve toward the fuel increase side, causing the governor weight to close against the large centrifugal force. and move it.

That is, the accelerator operating force is reduced by the return force of the biasing means of the reducing device.

(Example) First, to explain the governor mechanism of a diesel engine, in FIG. A governor weight 5 is supported together with a governor sleeve 6.

The governor weight 5 is attached to a holder 1 fixed to the camshaft 11.
2 via a support shaft 13, and rotates together with the camshaft 11 and is freely rotatable around the support shaft 13, that is, freely expandable in the radial direction of the camshaft 11. The governor sleeve 6 is fitted to the front end of the camshaft 11 so as to be movable in the axial direction, and its rear end surface is connected to the lift portion 5 of the governor weight 5.
a, and when the governor weight 5 expands due to an increase in the number of revolutions of the camshaft 11, the governor sleeve 6 is pushed by the lift portion 5a and moves forward.

A governor lever 7, a tension lever 8, and a thrust lever 9 are rotatably supported on the governor lever shaft 17. At the upper end of the governor lever 7 is a fuel increase/decrease rack 20.
The rack 20 extends toward the fuel injection pump 1 and meshes with a fuel increase/decrease pinion (not shown) of the fuel injection pump 1.

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 an accelerator control lever (regulator lever) 22. is biased toward the fuel increase side. The control lever 22 is rotatably supported by the governor case 3 via a control shaft 24. An Angleich spring case 32 is fixed to the lower part of the tension lever 8, and an Angleich rod 33 is supported within the Angleich spring case 32 so as to be movable in the axial direction, and is biased rearward by an Angleich spring 34 and locked. ring 3
3a. There is.

The thrust lever 9 extends downward from the governor lever shaft 17, and is provided with a shifter 26 facing the governor sleeve 6 from the front, so that the shifter 26 receives a governor force from the governor sleeve 6. The front surface of the shifter 26 faces the rear end surface of the Angleich rod 33 so as to be able to come into contact with it.

In FIG. 2 showing an exploded perspective view of the governor mechanism, the governor lever 7 is formed by a pair of left and right lever portions 7a17b and a connecting portion 7C that connects them together. It is rotatably supported by the governor lever shaft 17 via the governor lever shaft 17. One governor lever portion 7a extends upwardly and is pivotally connected to the rack 20;
The other governor lever part 7b has a set spring 2 between its upper rear end and the upper front end of the thrust lever 9.
5 is tensioned, and the tensile force of the set spring 25 causes the upper front end of the governor lever portion 7b to engage with the protrusion at the upper front end of the thrust lever 9.

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 their lower ends, and is supported by the governor lever shaft 17 via the cylindrical metal 15. There is.

An outer lever 21 is fixed to a portion of the accelerator control shaft 24 outside the governor case, and the outer lever 21 is connected to the accelerator pedal (accelerator device) 2 via an appropriate interlocking mechanism.
It is linked to 3.

That is, by depressing the accelerator pedal 23, the control lever 22 is rotated forward, and the governor spring 1 is rotated forward.
0 load, that is, the tensile force of the tension lever 8 toward the fuel increase side can be increased.

A starting increase spring 28 is compressed between the lower end of the tension lever 8 and the connecting portion 9a of the thrust lever 9.

As shown in FIG. 1, the accelerator reduction device 40, which is the essential part of the present invention, is composed of a cylindrical case 41, a slide rod 42, a coil spring (biasing means) 43, and the like. The case 41 has a threaded portion on its outer periphery, and is screwed onto the lid 44 and locked in a predetermined position with a lock nut 46 and a cap nut 47. For attachment, the lid 44 is fixed to the front end of the governor case 3. The slide rod 42 is supported within the case 41 so as to be movable in the front and back direction, is biased rearward by a spring 43, and is locked in the position shown in FIG. 1 by a locking washer 48. The rear end surface of the slide rod 42 faces the front end surface of the Angleich rod 33 with a predetermined distance therebetween.

Figure 4 shows the relationship between the pump rotational speed (camshaft rotational speed) and the amount of rack movement. It shows. That is, an increase in the amount of movement corresponds to the governor shown in FIG. In the graph of Fig. 4, A indicates the rack position during full-load operation, B indicates the rack position during no-load operation, broken line C3 indicates the injection amount line of 0, and D
□ indicates the rack position when there is no load in the high speed rotation range when the reducing device is provided, and D' indicates the rack position when there is no load in the high speed rotation range when the reducing device 1 is not provided. Q indicates the maximum opening position of the governor weight, and R indicates the mounting position of the spring of the reducing device.

Explain the operation. During full load operation, when performing a change operation in the high speed range, for example at the 21st rotation point, when the accelerator pedal 23 shown in FIG. The load pushing against the centrifugal force toward the fuel increase side is suddenly removed. On the other hand, since the rotational speed does not drop suddenly, the governor weight 5 shown in Figure 1 opens rapidly to the fully open side and pushes the governor sleeve 6 forward (fuel reduction side), approaching the weight fully open position Q shown in Figure 4. will be moved to. During this movement process, the spring attachment shown in FIG. 4 starts to push the slide rod 42 forward from the position R of FIG. 1 via the Angleich rod 33, compressing the spring 43. That is, the spring 43 of FIG. 1 is compressed in the stroke S section of FIG. 4. As a result, forward movement of the governor sleeve 6 is damped, and energy for reducing the pedal effort is stored in the spring 43.

When the accelerator pedal 23 is depressed again after the gear change, the return force of the spring 43 in FIG. 1 acts as a pedal force reduction force at the beginning of the depression, that is, in the section of stroke S in FIG. 4, and the accelerator operating force is reduced. Reduce.

(Another embodiment) (1) Fig. 3 shows an accelerator operating force reducing device that includes a diaphragm case 51 and a diaphragm case lid 52, and the outer peripheral end of a rubber diaphragm 53 is sandwiched between the case 51 and the case lid 52. A slide rod 42 is integrally connected to the center of the diaphragm 53, and a coil spring 43 is compressed between the diaphragm 53 and the case lid 52. The air chamber 55 communicates with the atmosphere through a constriction portion 57.

(2) In the embodiments shown in FIGS. 1 and 3, the slide rod of the mitigation device is opposed to the governor sleeve 6 via the Angleich rod, but the slide rod can also be directly opposed to the governor sleeve.

(Effects of the Invention) As explained above, in the first invention, the governor sleeve 6 is provided with a slide rod 42 facing from the fuel depletion side so as to be movable in the axial direction, and the slide rod 42 is moved toward the governor by the biasing means (spring 43). When the governor sleeve protrudes in a high-speed rotation range, the governor sleeve 6 contacts the slide rod 42 directly or indirectly through an intermediate member, and moves toward the fuel depletion side against the biasing means. Since the diesel engine is equipped with an accelerator operation force reduction device configured to push the slide rod 42: (1) During high-speed rotation, when the accelerator device is once loosened to change gears, the governor weight 5 suddenly reaches the fully open position. In addition to being able to buffer the opening of the accelerator, when the accelerator is pressed again, the energy stored in the reducing device acts as a force to reduce the accelerator operation force at the beginning of depressing the accelerator, reducing the accelerator operation and improving accelerator operation performance.

(2) Since it is equipped with a reducing device that directly pushes the governor sleeve 6, the reducing device is effective in the range of the fully open side of the governor weight compared to the conventional case where a dashpot is provided on the clutch pedal side. It can be used for

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a governor mechanism equipped with an accelerator operation force reduction device according to the present invention, FIG. 2 is an exploded perspective view of FIG. 1,
FIG. 3 is a partial vertical cross-sectional view of another embodiment, and FIG. 4 is a graph showing the relationship between pump rotation speed and rack movement amount. 5...
・Governor weight, 6...Governor sleeve, 7...
Governor lever, 8... Tension lever, 9... Thrust lever, 11... Camshaft, 40... Accelerator operation force reduction device, 42... Slide rod, 43...
...Spring patent applicant for accelerator operation force reduction Yanmar Diesel Co., Ltd. U Motor rotation speed (rρm)

Claims (1)

[Claims] The camshaft is equipped with a governor weight that can be freely expanded in the radial direction of the camshaft, and a governor sleeve that engages with the governor weight and moves toward the fuel depletion side by the expansion operation of the governor weight, and the governor sleeve is connected to a governor link mechanism. In a diesel engine that is interlockingly connected to an accelerator device and a fuel increase/decrease rack through death,
When the governor sleeve protrudes in a high-speed rotation range, the governor sleeve contacts the slide rod directly or indirectly through an intermediate member, and pushes the slide rod toward the fuel depletion side against the biasing means. A diesel engine accelerator operation force reduction device featuring: