JP2524130B2 - Governor device for internal combustion engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a two-lever governor device for an internal combustion engine.

(Prior Art and Its Problems) A conventional two-lever governor device is, for example, Jikken Sho 56.
-37067, the governor first and second levers are rotatably supported on the same lever support shaft, and equipped with a starting increase spring that pulls the first lever toward the fuel increase side for fuel increase at start. Further, a stop mechanism is specially provided for rotating the first lever in the fuel reducing direction against the start-up increasing spring when the engine is stopped. Therefore, the number of parts increases,
It takes time to manage and there is a cost problem.

Also, the maximum limit of the fuel injection amount at the time of starting is determined by the stopper of the fuel injection pump or the fuel limiting device, so if you try to obtain the fuel injection amount at the time of starting that matches the specifications, it will meet the specifications. Fuel injection pumps must be made, and the types of fuel injection pumps increase.

Further, when the engine is stopped, the first and second levers are connected by a special pin to transmit the force, so that the fuel injection amount limitation at the time of starting and the stopper mechanism at the time of stopping the engine are individually provided. It gets complicated.

(Means for Solving the Problem) In order to solve the above problem, the present invention provides a first lever rotatably around a governor lever shaft, and connects one end of the first lever to a control rack and the other end. Part of the governor sleeve is abutted, and the second lever is rotatably supported on the first lever portion spaced from the governor lever shaft toward the control rack side via the second lever support shaft parallel to the governor lever shaft, The second lever is connected to the regulator lever via a regulator spring, and the Angleich spring device having a pin portion is fixed to one of the first and second levers, and the pin portion passes through the other lever. And a stopper portion that is engageable with the other lever is provided at the tip portion of the pin portion, and the stopper portion separates the first lever and the second lever from each other. The amount of relative rotation in the direction is regulated.

(Embodiment) FIG. 5 is a vertical sectional view of a diesel engine equipped with a two-lever governor device according to the present invention. In FIG. 5, reference numeral 1 denotes a governor sleeve, for example, a shaft at the end of a crankshaft. Governor weight 2 is fitted so that it can move in any direction.
It is moved in the axial direction by the rotation (expansion) operation of the centrifugal force.

The vertical governor lever shaft 6 is rotatably supported by the gear case 5, and the governor first lever 7 is fixed to the governor lever shaft 6. One end of the first lever 7 extends toward the fuel injection pump 8 side and is engaged with a rack pin 9a of the fuel increase / decrease control rack 9. The other end of the first lever 7 extends toward the governor sleeve 1 side to form a bifurcated force receiving portion 7a, which is in contact with the end surface of the governor sleeve 1.

In FIG. 1 showing a perspective view of a two lever type governor device, a bracket 8 is formed at a portion of the governor first lever 7 which is spaced from the governor lever shaft 6 toward the rack side.
The first lever 7 and the bracket 8 have a governor second lever 10
Is attached to the support shaft 11. The support shaft 11 has a governor second lever 10 attached thereto.
The boss portion 10a is rotatably fitted. Second lever 10
Is located above the first lever 7 with a space therebetween, and extends to the rack pin 9a side substantially in parallel with the first lever 7. The tip of the second lever 10 is the first lever side 7 (lower side)
The plate portion 10b is integrally provided at the lower end thereof. A bracket 17 is formed on the first lever 7 so as to face the plate portion 10b from the fuel increase side, and a pin insertion hole 14 is formed in the bracket 17. An Angleich spring device 13 is fixed to the plate portion 10b.
It is located between b and the bracket 17 in a compressible manner, the pin portion 13a of the Angleich spring device 13 passes through the insertion hole 14 of the bracket 17 and extends toward the fuel addition side, and the stopper portion 13b is formed at the tip portion. ing. The stopper portion 13b is opposed to the bracket 17 at a distance, and the stopper portion 13b is rotated by relative rotation between the first lever 7 and the second lever 10.
13b is engageable with the bracket 17. Further, as shown in FIG. 3, when the engine is started, the protrusion amount H of the pin portion 13a determines the increase amount H of the rack pin 9a. Therefore, for example, in a specification requiring acceleration, a large L dimension is used and a specification not requiring acceleration. Then, the L dimension is made small.

In FIG. 2 showing the top view, the rod portion 20a of the fuel limiting device 20 faces the plate portion 10b from the fuel increase side. The fuel limiting device 20 is screwed to the gear case lid 21 and fixed by a nut 22, and has a torque spring built therein to urge the rod portion 20a toward the fuel reducing side.

The second lever 10 is integrally formed with an arm 10c extending substantially perpendicular to the second lever 10 on the fuel reducing side. The arm 10c has a plurality of holes 25 at different distances from the center O2 of the support shaft 11, 2
5'is formed. One end of the regulator spring 27 engages with the hole 25, the regulator spring 27 extends diagonally across the upper side of the second lever 10 toward the rack pin side, and the tip end thereof is, as shown in FIG. Is engaged with. The regulator lever 30 is fixed to the regulator shaft 31. The regulator shaft 31 is rotatably supported by the gear case 5, protrudes upward, and an accelerator lever 32 is fixed to the upper end of the regulator shaft 31.

(Operation) When the engine is started, the governor force FG applied to the force receiving portion 7a in FIG. 1 is zero. Arrow regulator lever 30
By rotating in the A1 direction, the regulator spring
A tensile force FR is applied to 27, the second lever 10 rotates in the B1 direction around the support shaft 11, and the first lever 7 also rotates in the B1 direction via the Angleich spring device 13. By contacting the fuel limiting device 20, the second lever 10 is restricted from rotating in the fuel increasing direction. However, spindle 11
Is eccentric with respect to the lever shaft 6 on the rack pin 9a side, so that the pulling force FR of the regulator spring 27 causes a rotational moment MR around the lever shaft 6 in the support shaft 11 portion. The rotation moment MR causes the first lever 7 to move to the second
It rotates in the direction of arrow B1 with respect to the lever 10, moves the rack pin 9a to the maximum fuel increase position OP1 as shown in FIG. 3, and increases the amount of fuel. At this time, the stopper portion 13b of the pin portion 13a is engaged with the bracket 17, whereby excessive rotation of the first lever 7 in the fuel increasing direction is restricted, and therefore, starting failure due to excessive injection amount is prevented.

When the governor force FG becomes larger than the rotation moment MR of the support shaft 11 during engine rotation, the first lever 7 returns to the original operating state as shown in FIG.

When the engine is running, the governor force FG uses the Angreich spring device at half throttle or full throttle 13
When it becomes smaller than the spring force FA of and the rotation speed decreases, the Angleich rod 13d (see FIG. 3) comes out and pushes the bracket 17 of the first lever 7 to the fuel increase side, and the fuel injection amount is increased accordingly. .

When stopping the engine, rotate the regulator lever 30 shown in FIG. 1 in the direction of the arrow A2 to move the second lever.
Rotate 10 in the direction of arrow B2. First lever 7 and second lever
The stopper portion 13b shown in FIG. 4 engages with the bracket 17 of the first lever 7, although it is rotatable independently of each other. That is, the pulling force in the fuel reducing direction from the second lever 10 to the first lever 7 via the stopper portion 13b and the small governor force FG applied to the force receiving portion 7a facilitates the first movement.
The lever 7 rotates in the fuel reducing direction to cut the fuel and stop the engine.

FIG. 4 is a graph showing the relationship between the rack position and the number of revolutions, where X1 is the section in which the rotational moment MR of the support shaft 11 portion in FIG. 1 is acting, and X2 is the Angleich spring device 13 in FIG. The section where X is operating, X3 is the fuel restriction device of Fig. 1.
It is a section where only 20 torque springs are operating.
That is, the output is limited by the fuel limiting device 20 at high speed, and the output increase is limited by the Angleich spring device 13 at medium speed.

Further, the hole for engaging the regulator spring 27 shown in FIG.
By changing 25 to, for example, a hole 25 'and shortening the distance from the center O2 of the support shaft to the locking point of the regulator spring 27 from L1 to L2, the position of the section X1 in FIG. 4 is changed to that in FIG. It can move to the high-speed rotation side as shown by a virtual line.
That is, by changing the holes 25 and 25 ', the maximum amount of increase at low speed can be arbitrarily set.

(Another embodiment) In the illustrated embodiment, the Angleich spring device 13 is fixed to the second lever 10, but the Angleich spring device 13 may be fixed to the first lever 7. In that case, the pin portion 13 penetrates the plate portion 10b of the second lever 10, and the stopper portion 13b is formed at the tip thereof.

(Effects of the Invention) According to the present invention as described above; (1) Both ends of the control rack 9 and the governor sleeve 1
To the regulator lever 30 via a regulator spring 27 and a second lever 7 that abuts on the regulator lever 30 respectively.
In a two-lever governor consisting of two levers, the lever 10 and a governor lever shaft 6 supporting the first lever 7, the first lever portion spaced from the control rack side is parallel to the governor lever shaft 6. Second lever support shaft 11
The second lever 10 is rotatably supported via. In short, in the 2-lever type governor, since the support shaft 11 of the second lever 10 is eccentric from the lever shaft 6 of the first lever 7 toward the fuel increase / decrease rack side, the second lever 10 moves the regulator spring 27 when the engine is started. The rotation moment MR around the lever axis is generated in the support shaft 11 by rotating in the fuel increasing direction via the, and the fuel can be increased to the maximum extent by the rotation moment MR.

That is, it is possible to easily increase the amount of fuel without providing a special spring for increasing the amount of fuel at the time of starting, which reduces the number of parts, reduces the management labor, and reduces the cost of parts. Is also reduced.

(2) By pulling the accelerator lever 32, that is, the regulator lever 30, the engine can be started at any position of the accelerator lever 32 from the low speed rotation position to the high speed rotation position, and the startability is improved.

(3) Since the fuel amount increasing spring at the time of starting is unnecessary, a special stop mechanism for stopping the engine against the fuel amount increasing spring at the time of starting becomes unnecessary,
The number of parts is further reduced, and the management labor and the parts cost are further reduced.

(4) Rotational moment MR due to the eccentric arrangement of the two axes 6 and 7,
By adjusting the three forces of the torque spring force FT of the fuel limiting device 20 and the force FA of the Angleich spring device 13,
Torque characteristics that match the work equipment are obtained, and engine performance is improved.

(5) By providing a stopper portion 13b at the tip of the pin portion 13a of the Angleich spring device 13, the relative amount of rotation of the first lever 7 and the second lever 10 in the direction away from each other is regulated. Therefore, when restricting the increase of the fuel injection amount at the time of engine start to a certain range, it is not necessary to change the type of fuel injection pump according to the specifications of each engine as in the conventional case, and the length of the pin portion 13a can be changed. By simply changing it, you can easily set it to an arbitrary amount according to the specifications of each institution.

That is, with a simple structure, it is possible to easily limit the excessive injection at the time of starting the engine, and it is possible to prevent the starting failure due to the excessive injection amount.

(6) Stopper part 13 of the Angleich spring device 13
Since b acts as a stop operating force transmission mechanism from the second lever 10 to the first lever 7 when the engine is stopped, no special connecting pin is required and the structure is further simplified.

[Brief description of drawings]

FIG. 1 is a perspective view of a governor device to which the present invention is applied, FIG. 2 is a top view of FIG. 1, FIG. 3 is a top view of the governor device showing a state at the time of starting, and FIG. FIG. 5 is a top view of the governor device showing the state, FIG. 5 is a partial vertical sectional view of an engine equipped with the governor device of FIG. 1, and FIG. 6 is a graph showing the relationship between the rotational speed and the rack position. 1 ... Governor sleeve, 6
...... Governor lever shaft, 7 …… Governor first lever, 10 ……
Governor 2nd lever, 11 …… Secondary lever support shaft, 13 …… Angreich spring device (Angreich spring), 13a …… Pin part, 13b …… Stopper part, 27 ……
Regulator spring, 30 …… Regulator lever,
9: Control rack for increasing / decreasing combustion

Claims (1)

(57) [Claims] 1. A first lever is provided so as to be rotatable about a governor lever shaft, one end of the first lever is connected to a control rack, and the other end is in contact with a governor sleeve so that the governor lever shaft moves from the control rack side. A second lever parallel to the governor lever shaft is attached to the first lever portion at a distance.
The second lever is rotatably supported via the lever support shaft,
The second lever is connected to the regulator lever via a regulator spring, and the Angleich spring device having a pin portion is fixed to one of the first and second levers, and the pin portion passes through the other lever. Then, a stopper portion that is engageable with the other lever is provided at the tip portion of the pin portion, and the stopper portion restricts the relative rotation amount of the first lever and the second lever in the direction away from each other. A governor device for an internal combustion engine characterized by the above.