JPH10339175A - Fuel supply device for diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily thread-move a fuel limiting bolt for micro-quantity by rotation operation of a rotation operation member. SOLUTION: In this fuel supply device, a governor lever 2 which oscillates is received by a tip of a fuel limiting bolt 5, and a position to receive the governor lever 2 is adjusted by thread-move adjustment to the fuel limiting bolt 5. In this case, a rotation adjusting gear case 8 is installed on a body wall 7 of an engine, a rotation adjusting gear line 11 provided with a drive gear 9 and a follower gear 10 is contained in the rotation adjusting gear case 8, the drive gear 9 is fixed to a rotation operation shaft 12, the follower gear 10 is fixed to a fuel limiting bolt 5, and rotation number of the rotation operation shaft 12 is decreased by the rotation adjusting gear line 11 to be transmitted to the fuel limiting bolt 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fuel supply device for a diesel engine.

[0002]

2. Description of the Related Art FIG. 3 shows a prior art of a fuel supply system for a diesel engine. This prior art,
As in the present invention, the governor lever 102 of the mechanical governor 101 is connected to the fuel metering rack 104 of the fuel injection pump 103.
The fuel limiting bolt 105 is screwed into the female screw portion 106 for the limiting bolt, the tip of the fuel limiting bolt 105 faces the governor lever 102, and the swinging governor lever 102 is received by the tip of the fuel limiting bolt 105. The position for receiving the governor lever 102 can be adjusted by adjusting the screwing of the fuel limiting bolt 105.

[0003] However, this prior art differs from the present invention in that the fuel limiting bolt 105 is directly rotated.

[0004]

The above prior art has the following problems. In the prior art, the fuel limiting bolt 105
Is directly rotated, it is difficult to screw the fuel limiting bolt 105 by a very small amount. For this reason, the accuracy of setting the fuel limit is not sufficient, which makes it difficult to take measures against exhaust gas.

An object of the present invention is to make it possible to easily screw a small amount of a fuel limiting bolt.

[0006]

[Means for Solving the Problems]

(First invention) In a first invention, as shown in FIG. 1 or FIG. 2, a fuel metering rack 4 of a fuel injection pump 3 is interlockedly connected to a governor lever 2 of a mechanical governor 1, and a fuel limiting bolt 5 is used for a limiting bolt. The tip of the fuel limiting bolt 5 faces the governor lever 2, the swinging governor lever 2 is received by the tip of the fuel limiting bolt 5, and the governor lever 2 is adjusted by screwing the fuel limiting bolt 5. A fuel supply device for a diesel engine, in which a receiving position can be adjusted, is characterized as follows.

A rotation adjusting gear case 8 is mounted on a wall 7 of the engine, and a rotation adjusting gear train 11 having a driving gear 9 and a driven gear 10 is accommodated in the rotation adjusting gear case 8. Is fixed to the rotary operation shaft 12, the driven gear 10 is fixed to the fuel limiting bolt 5, and the rotation speed of the rotary operating shaft 12 is reduced by the rotation adjusting gear train 11 and transmitted to the fuel limiting bolt 5. It is characterized by.

(Second Invention) In a second invention, as shown in FIG. 1, in the first invention, the rotation adjusting gear train 11 is interposed between the rotation adjusting gear case 8 and the engine of the engine. A female screw portion 6 for restricting bolt is provided on a case wall portion 13 located on the opposite side of the machine wall 7, and a lock nut 14 for restricting bolt for stopping the fuel restricting bolt 5 from rotating is provided at a position adjacent to the female screw portion 6 for restricting bolt. It is characterized in that the lock nut 14 for the limit bolt is frictionally fixed to the female screw portion 6 for the limit bolt by screwing the lock nut 14 for the limit bolt and tightening the lock nut 14 for the limit bolt.

(Third invention) According to a third invention, as shown in FIG. 2, in the first invention or the second invention, a rotation adjusting gear train 11 is interposed in the case wall of the rotation adjusting gear case 8. Then, a female screw portion 15 for an operating shaft is provided on a case wall portion 13 located on the opposite side of the engine wall 7 of the engine, and the rotary operating shaft 12 is screw-fitted to the female screw portion 15 for the operating shaft. The operation shaft lock nut 16 to be prevented from rotating is rotated at a position adjacent to the operation shaft female thread portion 15.
And the operation shaft lock nut 16 is tightened, so that the operation shaft lock nut 16 is attached to the operation shaft female thread portion 1.
5 is fixed by friction.

[0010]

Actions and effects of the present invention

(First Invention) The first invention has the following effects. First
In the invention, as shown in FIG. 1 or FIG.
Since the rotation speed of the rotation control gear 2 is reduced by the rotation adjusting gear train 11 and transmitted to the fuel limiting bolt 5, the rotary operating tool 12 is rotated to slightly screw the fuel limiting bolt 5. Can be easily performed. For this reason, the accuracy of setting the fuel limit amount is increased, and the measures against exhaust gas become easy.

(Second Invention) The second invention has the following functions and effects in addition to the functions and effects of the first invention. In the second invention, as shown in FIG. 1, the lock nut 14 for the limiting bolt is placed at a position adjacent to the female thread portion 6 for the limiting bolt 5.
And tightening the lock nut 14 for the limiting bolt, so that the lock nut 14 for the limiting bolt is frictionally fixed to the female thread portion 6 for the limiting bolt. The rotation adjusting gear case 8 is not distorted. For this reason, the displacement of the fuel limiting bolt 5 is less likely to occur, and the accuracy of setting the fuel limiting amount can be kept high.

The third invention has the following function and effect in addition to the functions and effects of the first or second invention. In the third invention,
As shown in FIG. 2, the operation shaft lock nut 16 is screwed to the rotation operation shaft 12 at a position adjacent to the operation shaft female thread portion 15, and the operation shaft lock nut 16 is tightened.
The lock nut 16 for the operation shaft is frictionally fixed to the female screw portion 15 for the operation shaft.
Even if the screw 6 is tightened, the rotation adjusting gear case 8 is not distorted. For this reason, the displacement of the fuel limiting bolt 5 is less likely to occur, and the accuracy of setting the fuel limiting amount can be kept high.

In the third aspect of the present invention, as shown in FIG. 2, the rotation shaft 12 is prevented from rotating by the lock nut 16 for the operation shaft. Even if it rotates, its rotation speed is reduced by the rotation adjusting gear train 11 and transmitted to the fuel limiting bolt 5. For this reason, the displacement of the fuel limiting bolt 5 hardly occurs,
The accuracy of setting the fuel limit can be kept high.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a first embodiment of the present invention. In the first embodiment, a fuel supply device for a multi-cylinder diesel engine is used.

The structure of the fuel supply device is as follows. As shown in FIG. 1, a fuel injection pump 3 is accommodated in a pump case 17 disposed on the side of a crankcase (not shown), and a fuel injection camshaft 1 is provided below the fuel injection pump 3.
8, a timing gear case 19 is mounted in front of the crankcase and the pump case 17, a timing gear train 20 is accommodated in the timing gear case 19, and the fuel injection cam gear 21 forming the timing gear train 20 is connected to the fuel injection cam. It is fixed to the shaft 18. The timing governor case 19 also houses the mechanical governor 1.

The structure of the mechanical governor 1 is as follows. The fuel metering rack 4 of the fuel injection pump 3 is connected to the governor lever 2 in an interlocking manner, the fuel limiting bolt 5 is screwed into the female screw portion 6 for the limiting bolt, and the tip of the fuel limiting bolt 5 faces the governor lever 2 to swing. The governor lever 2 is received by the tip of the fuel limiting bolt 5 and the position at which the governor lever 2 is received can be adjusted by adjusting the screwing of the fuel limiting bolt 5.

The governor lever 2 is a timing gear case 1
9 and the pump case 17, and are pivotally supported in the timing gear case 19. The governor lever 2 is of a two lever type including a governor force input lever 2a and a spring force input lever 2b. Fuel injection cam gear 2
1 is provided with a ball-shaped governor weight 22, and a governor sleeve 23 is slidably mounted on the fuel injection cam shaft 18 at a position facing the governor weight 22, and a governor force 24 generated by the governor weight 22 is governor sleeve. The control signal is input to the governor force input lever 2a through the switch 23. The governor force input lever 2a has a fuel injection pump 3
The fuel metering racks 4 are linked to each other. A governing spring 25 is mounted on the timing gear case 19, and a governor spring 26 is provided between the governing lever 25 and the spring force input lever 2b.
Is applied to the spring force input lever 2b.

A torque increasing device 28 is mounted on the governor force input lever 2a, and the torque increasing device 28 is opposed to the spring force input lever 2b. The torque-up device 28 includes a torque pin 3 in a torque-up case 29.
0 and the torque spring 31, the tip of the torque pin 30 projects from the torque up case 29 by the spring force of the torque spring 31, and receives the spring force input lever 2 b at the tip of the torque pin 30.

The functions of the mechanical gahanna 1 are as follows. The governor lever 2 is caused by an unbalanced force between the governor force 24 and the spring force 27 or the spring force of the torque spring 31.
Is swung to move the fuel metering rack 4 so as to suppress fluctuations in the engine speed irrespective of load fluctuations. During the partial load operation, the governor force input lever 2a and the spring force input lever 2b approach each other due to the governor force 24 and the spring force 27, and the governor lever 2 is integrated with the torque pin 30 being pushed into the torque up case 29. Rocks. During the rated load operation, the spring force input lever 2b contacts the tip of the fuel limiting bolt 5. During the overload operation, only the governor force input lever 2a swings due to the unbalance between the governor force 24 and the spring force of the torque spring 31 while the spring input lever 2b is received by the tip of the fuel limiting bolt 5.

In this embodiment, since the position for receiving the spring force input lever 2b can be adjusted by adjusting the screwing of the fuel limiting bolt 5, it is possible to adjust the fuel injection amount during rated load operation.

In this embodiment, a rotation adjusting gear case 8 is mounted on a wall 7 of an engine, and a rotation adjusting gear train 11 having a driving gear 9 and a driven gear 10 is accommodated in the rotation adjusting gear case 8. Then, the drive gear 9 is connected to the rotary operation shaft 12.
And the driven gear 10 is fixed to the fuel limiting bolt 5,
The rotation speed of the rotation operation shaft 12 is reduced by the rotation adjustment gear train 11 and transmitted to the fuel limiting bolt 5. According to such a configuration, a small amount of fuel limiting bolt 5 can be easily screwed by rotating the rotary operation shaft 12.

The engine wall 7 on which the rotation adjusting gear case 8 is mounted is a wall of the timing gear case 19.
The rotation adjusting gear train 11 includes only a driving gear 9 and a driven gear 10. The number of teeth of the driving gear 9 is smaller than the number of teeth of the driven gear 10. The rotation operation shaft 12 includes a rotation adjustment gear case 8.
A butterfly-shaped operation handle 33 is formed at a portion protruding from the projection. Timing gear case 1 as engine wall 7
A bolt insertion hole 32 is formed in the wall 9, and the fuel limiting bolt 5 is made to pass through the bolt insertion hole 32.

In this embodiment, of the case wall of the rotation adjusting gear case 8, the limit bolts are provided on a case wall portion 13 opposite to the engine wall 7 with the rotation adjusting gear train 11 interposed therebetween. A female screw portion 6 is provided, and a lock nut 14 for a limiting bolt for preventing the fuel limiting bolt 5 from rotating is attached to the fuel limiting bolt 5 at a position adjacent to the female screw portion 6 for the limiting bolt.
, And tightening the lock nut 14 for the limiting bolt, the lock nut 14 for the limiting bolt is frictionally fixed to the female screw portion 6 for the limiting bolt. According to such a configuration, even if the lock nut 14 for the limiting bolt is tightened, the rotation adjusting gear case 8 is not distorted. In addition, the female screw portion 6 for the limiting bolt is formed of a nut welded to the case wall portion 13.

In the second embodiment shown in FIG. 2, the rotation adjusting gear train 11 is formed on the case wall of the rotation adjusting gear case 8.
The operation shaft internal thread portion 15 is provided on the case wall portion 13 located on the opposite side of the engine wall 7 with the rotation axis interposed therebetween, and the rotary operation shaft 12 is screw-fitted to the operation shaft internal thread portion 15,
Lock nut 1 for operating shaft that prevents rotation of operating shaft 12
The screw 6 is screwed onto the rotary operation shaft 12 at a position adjacent to the female screw portion 15 for the operating shaft, and the lock nut 16 for the operating shaft is tightened, so that the lock nut 16 for the operating shaft is frictionally fixed to the female screw portion 15 for the operating shaft. I am trying to be.

In the case wall of the gear case 8 for rotation adjustment, a nut serving as the female screw portion 6 for limiting bolts is welded to a case wall portion 35 along the machine wall 7 of the engine. The female screw portion 15 for the operating shaft is formed of a nut welded to the case wall portion 13 located on the opposite side of the engine wall 7 of the engine. A slot 34 that engages with a driver is formed at a portion of the rotation operation shaft 12 protruding from the rotation adjustment gear case 8. Other configurations are the same as those of the first embodiment. FIG.
Among them, the same elements as those of the first embodiment are denoted by the same reference numerals.

According to such a configuration, even if the operation shaft lock nut 16 is tightened, the rotation adjusting gear case 8 is not distorted. Also, when the operation shaft lock nut 16 is tightened, even if the rotation operation shaft 12 rotates, the rotation speed is reduced by the rotation adjusting gear train 11 and transmitted to the fuel limiting bolt 5.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a fuel supply device for a diesel engine according to a first embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 of a second embodiment of the present invention.

FIG. 3 is a diagram corresponding to FIG. 1 of the prior art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mechanical governor, 2 ... Governor lever, 3 ... Fuel injection pump, 4 ... Fuel metering rack, 5 ... Fuel limiting bolt,
6 ... female thread for limiting bolt, 7 ... engine wall, 8 ...
Rotation adjustment gear case, 9 drive gear, 10 driven gear, 11 rotation adjustment gear train, 12 rotation operation shaft, 13
... Case wall part, 14 ... Lock nut for limiting bolt, 1
5: Female thread for operation shaft, 16: Lock nut for operation shaft.

Claims (3)

[Claims] The governor lever of a mechanical governor (1)
(2) The fuel metering rack (4) of the fuel injection pump (3) is interlocked and connected to the fuel injection pump (3).
(6), the tip of the fuel limiting bolt (5) faces the governor lever (2), and the swinging governor lever (2) is received by the tip of the fuel limiting bolt (5). In the fuel supply system for a diesel engine, the position for receiving the governor lever (2) can be adjusted by the screwing adjustment of (5), a rotation adjusting gear case (8) is mounted on the engine wall (7), and the rotation is adjusted. A rotation adjusting gear train (11) including a driving gear (9) and a driven gear (10) is accommodated in an adjusting gear case (8), and the driving gear (9) is fixed to a rotating shaft (12). , Fix the driven gear (10) to the fuel limiting bolt (5),
A fuel supply device for a diesel engine, wherein the rotation speed of (12) is reduced by a rotation adjusting gear train (11) and transmitted to a fuel limiting bolt (5). 2. The fuel supply system for a diesel engine according to claim 1, wherein a rotation adjusting gear train (11) is interposed among the case walls of the rotation adjusting gear case (8). A lock nut for a limit bolt which is provided with a female screw portion (6) for a limit bolt on a case wall portion (13) located on the opposite side of (7) to prevent the fuel limit bolt (5) from rotating.
(14) is screwed into the fuel limiting bolt (5) at a position adjacent to the female screw portion (6) for the limiting bolt, and the lock nut for the limiting bolt is screwed.
A fuel supply device for a diesel engine, characterized in that the lock nut (14) for the limiting bolt is frictionally fixed to the female screw portion (6) for the limiting bolt by tightening the (14). 3. The fuel supply device for a diesel engine according to claim 1, wherein the rotation adjusting gear train (11) is interposed among the case walls of the rotation adjusting gear case (8). The case wall portion (13) located on the opposite side of (7) is provided with a female screw portion (15) for the operating shaft, and the rotary operating shaft (12) is screwed into the female screw portion (15) for the operating shaft.
Lock nut for operation shaft to prevent rotation of rotation operation shaft (12)
(16) is screwed onto the rotary operation shaft (12) at a position adjacent to the operation shaft female thread portion (15), and the operation shaft lock nut (16) is tightened to thereby obtain the operation shaft lock nut (16). A fuel supply device for a diesel engine, wherein the fuel supply device is frictionally fixed to the female screw portion (15) for the operation shaft.