JP2864340B2 - Supercharged diesel engine boost compensator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boost compensator for a turbocharged diesel engine.

[0002]

2. Description of the Related Art FIG. 4 shows a prior art of a boost compensator for a turbocharged diesel engine. This has the following basic structure as in the present invention. That is, a diaphragm case 104 is provided on the rear side of the injection pump case 103 that houses the fuel injection pump 101, with the fuel increase / decrease direction of the metering rack 102 of the fuel injection pump 101 being the front-back direction, the fuel increasing side being the rear side, A diaphragm 105 is accommodated in the diaphragm case 104, and a boost pressure introduction chamber 106 is formed in the diaphragm case 104 by the diaphragm 105, and the boost pressure introduction chamber 106 communicates with an intake path (not shown). .

The diaphragm 105 is made to face the boost pressure introducing chamber 106 from the front side thereof, and the diaphragm 105 is urged toward the boost pressure introducing chamber 106 by an urging spring 107.
5, a swinging lever 109 is connected to the interlocking rod 108, and the boosting pressure 110 introduced into the boosting pressure introducing chamber 106 and the urging force of the urging spring 107 are attached to the interlocking rod 108. The swing lever 109 is swung by an unbalanced force with the swing 111 and the fuel injection amount of the fuel injection pump 101 is limited based on the swing posture.

[0004] With such a basic structure, it is possible to prevent the generation of black smoke due to a delay in supercharging during acceleration. That is, at the time of acceleration, the metering rack 102 is quickly moved to increase the amount, whereas the rise of the supercharging pressure is delayed, so that the fuel injection amount becomes excessive with respect to the intake amount, and black smoke is generated in the exhaust due to incomplete combustion. Tends to mix. Therefore, while the boost pressure is delayed, the swing lever 10
The fuel injection amount of the fuel injection pump 101 is restricted based on the swinging posture of No. 9 to prevent the generation of black smoke.

In this prior art, a pivot 120 is mounted on a pivot lever case 119, a pivot lever 109 is pivotally supported on the pivot 120, and an engaging pin 121 is provided at the front end of an interlocking rod 108. The base end of the swing lever 109 is brought into contact with the engaging pin 121 from the front side thereof, and the tip end of the swing lever 109 is made to face the metering rack 102 from the rear side. An adjustable fuel limit bolt 115 is provided.
Of the swing lever 109 from the rear side. Then, by swinging the swing arm 109 about the pivot 120, the tip of the swing arm 109 is moved back and forth, and the tip of the swing arm 109 receives the metering rack 102 from the rear side. The fuel injection amount of the fuel injection pump 101 is limited.

[0006]

The above prior art has the following problems. When the swing lever 109 is incorporated at the time of engine production, a pivot 120 is installed in the swing lever case 119,
It is necessary to pivot the swing lever 109 on this pivot 120. For this reason, the work of assembling the swing lever 109 is troublesome, and this is one of the factors that complicates the engine manufacturing work.

When removing the swing lever 109 during maintenance of the engine, it is necessary to remove the pivot 120 from the swing lever case 119. Therefore, the work of removing the swing lever 109 is troublesome, and this is one of the factors that complicates the maintenance of the engine.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a boost compensator for a turbocharged diesel engine, which simplifies the operation of assembling an oscillating lever for limiting the injection amount of a fuel injection pump, thereby simplifying the engine manufacturing operation. An object of the present invention is to provide an apparatus that simplifies an operation for removing a moving lever and simplifies an engine maintenance operation.

[0009]

According to the present invention, as illustrated in FIG. 1 or FIG.
A diaphragm case 4 is provided on the rear side of the injection pump case 3 housing the fuel injection pump 1 with the fuel increase / decrease direction being the front-back direction and the fuel increasing side being the rear side. The diaphragm 5 is housed in the diaphragm case 4. The diaphragm 5 forms a boost pressure introducing chamber 6 in the diaphragm case 4, communicates the boost pressure introducing chamber 6 with the intake path, and allows the diaphragm 5 to face the boost pressure introducing chamber 6 from the front side. The diaphragm 5 is urged toward the boost pressure introducing chamber 6 by an urging spring 7,
An interlocking rod 8 slidable back and forth is attached to the front side of the diaphragm 5, and a swing lever 9 is interlockingly connected to the interlocking rod 8, and the boost pressure 10 introduced into the boost pressure introduction chamber 6 and the urging spring 7 Boosting a turbocharged diesel engine configured to swing the swing lever 9 by an unbalanced force with the urging force 11 and to limit the fuel injection amount of the fuel injection pump 1 based on the swing posture. The compensator is characterized as follows.

That is, as illustrated in FIG. 1 or FIG. 2, the base end of the swing lever 9 is pivotally attached to the front end of the interlocking rod 8, and the stopper rod 12 is slid back and forth on the injection pump case 3. This stopper rod 1 is movably supported.
2, a locking pin 13 is provided at the rear end, and a forked engaging portion 14 is provided at the tip of the swing lever 9, and the forked engaging portion 14 is detachably connected to the locking pin 13. A fuel limiting bolt 15 is provided on the rear side of the swing lever 9 so as to be adjustable in forward and backward screwing, and an arcuate cam surface 16 provided on the swing lever 9 is brought into contact with the front end face of the fuel limiting bolt 15. The arc-shaped cam surface 1 is formed on the front end face of the fuel limiting bolt 15.
The stopper rod 12 is slid forward and backward by swinging the swing lever 9 while guiding the guide rod 6, and the pressure receiving portion 1 of the governor lever 17 is moved at the front end of the stopper rod 12.
8 is received from the rear side, thereby limiting the fuel injection amount of the fuel injection pump 1.

[0011]

The present invention has the following functions and effects (see FIG. 1 or FIG. 2). When assembling the swing lever 9 at the time of engine production, the forked engaging portion 14 of the swing lever 9 attached to the interlocking rod 8 is inserted into the locking pin 13 to be engaged, and the arc cam of the swing lever 9 is engaged. It is only necessary to bring the surface 16 into contact with the front end face of the fuel limiting bolt 15. Therefore, as shown in FIG. 4, a pivot 120 is erected on the swing lever case 119,
Compared with the case where the swing lever 109 needs to be pivotally supported, the operation of assembling the swing lever 9 is simplified, and the manufacture of the engine is simplified.

When the swing lever 9 is to be detached during maintenance, the forked engaging portion 14 of the swing lever 9 is pulled out from the locking pin 13 to release the engagement. Just remove it with it. For this reason, as shown in FIG. 4, the pivot lever 120 is removed from the pivot lever case 119 and the pivot lever 109 is removed from the pivot lever case 119.
Is simplified, and the maintenance work of the engine is simplified.

Since the fuel limiting bolt 15 can also be used as a swing fulcrum of the swing lever 9, the number of parts can be reduced.

[0014]

An embodiment of the present invention will be described with reference to the drawings.
1 to 3 are diagrams for explaining an embodiment of the present invention. In this embodiment, a water-cooled vertical in-line three-cylinder diesel engine having a supercharger and a governor is used.

The structure of this engine is as follows. That is, as shown in FIG. 1, when viewed in a direction parallel to the cylinder axis 22, the direction of the crank axis 23 is the front-rear direction, the gear case mounting end 25 side of the cylinder block 24 is the front side, and the direction orthogonal to the crank axis 23. As the horizontal direction,
A flange 26 projects laterally from a gear case mounting end 25 of the cylinder block 24. The injection pump case 3 is attached to the flange portion 26 from the rear side. The injection pump case 3 houses the fuel injection pump 1, the fuel injection camshaft 27, and the governor mechanism.

The flange 26 has a case mounting hole 29.
A boss 30 is provided to protrude forward from the injection pump case 3, and the boss 30 is fixedly fitted in the case mounting hole 29. A fuel injection camshaft 27 is inserted into the boss 30, and an injection camshaft input gear 31 is externally fitted and fixed to a protruding end of the fuel injection camshaft 27. The input gear 31 is interlocked with a crank gear (not shown) via an idle gear 32. The injection camshaft input gear 31, idle gear 32, and crank gear are accommodated in a gear case 33.

According to such a configuration, since the injection pump case 3 is independent of the cylinder block 24, the fuel injection pump 1 and the governor mechanism 28
Before assembly into the cylinder block 24, the fuel injection characteristics of the fuel injection pump 1 can be adjusted in advance.

The configuration of the governor mechanism 28 is as follows. That is, as shown in FIG.
Is a so-called double lever type comprising a spring force input lever 34 and a governor force input lever 35, and a governor spring 37 is stretched between the spring force input lever 34 and the speed control lever 36. An input roller 38 provided at the lower end of the governor force input lever 35 is brought into contact with a governor sleeve 39 from the rear side. The governor sleeve 39 is in contact with the output portion 41 of the fly weight 40 from the rear side. Also, the governor force input lever 35
The rack pin 42 of the metering rack 2 of the fuel injection pump 1 is brought into contact with the front of the rack pin 42, and the rack pin 42 is pressed against the governor force input lever 35 by the urging force of the start spring 43.

In the governor mechanism 28, the governor lever 44 is disproportionately generated by the governor force 44 generated by the fly weight 40 and the spring force 45 of the governor spring 37.
7, the metering rack 2 is moved to adjust the fuel injection amount of the fuel injection pump 1, and the engine speed is kept constant irrespective of engine load fluctuations.

The basic structure of the boost compensator of this embodiment is as follows. That is, the direction in which the fuel is increased or decreased in the metering rack 2 of the fuel injection pump 1 is the front-back direction,
A diaphragm case 4 is provided on the rear side of the injection pump case 3 housing the fuel injection pump 1 with the fuel increasing side as the rear side. A diaphragm 5 is accommodated in the diaphragm case 4, and a boost pressure introduction chamber 6 is formed in the diaphragm case 4 by the diaphragm 5. The boost pressure introducing chamber 6 is communicated with an intake path (not shown).

The diaphragm 5 faces the boost pressure introducing chamber 6 from the front side. The diaphragm 5 is urged toward a boost pressure introducing chamber 6 by an urging spring 7, and an interlocking rod 8 slidable back and forth is attached to the front side of the diaphragm 5. This interlocking rod 8
The swing lever 9 is interlockingly connected to. Then, the swing lever 9 is swung by an unbalanced force between the boost pressure 10 introduced into the boost pressure introduction chamber 6 and the urging force 11 of the urging spring 7, and the fuel injection pump 1 is driven based on the swing posture. It is configured to limit the fuel injection amount.

With the above-described basic structure, it is possible to prevent the generation of black smoke due to a delay in supercharging during acceleration. That is, during acceleration, the metering rack 2 is quickly increased and moved, but the rise in supercharging pressure is delayed, so that the fuel injection amount becomes excessive with respect to the intake amount, and black smoke is generated in the exhaust due to incomplete combustion. Tends to mix. For this reason,
While the boost pressure is delayed, the fuel injection amount of the fuel injection pump 1 is limited based on the swing posture of the swing lever 9 to prevent the generation of black smoke.

In this embodiment, the following configuration is employed to simplify the assembling work and the removing work of the swing lever 9. That is, as shown in FIG. 1, the base end of the swing lever 9 is pivotally attached to the front end of the interlocking rod 8. A guide hole 46 is formed in the lateral wall of the injection pump case 3 in the front-rear direction, and the stopper rod 12 is internally fitted therein so as to be slidable back and forth. As shown in FIG. 3, a slit 47 is provided at the rear end of the stopper rod 12 from the rear end face toward the front side, and the locking pin 13 is installed here. Further, a forked engaging portion 14 is provided at the tip of the swinging lever 9, and the forked engaging portion 14 is engaged with the locking pin 13 so as to be freely inserted and removed. A fuel limiting bolt 15 is provided on the rear side of the swing lever 9 so as to be able to adjust the forward and backward screws. An arcuate cam surface 16 provided on the swing lever 9 is brought into contact with the front end face of the fuel limiting bolt 15. is there.

Then, as shown in FIG. 1, the rocking lever 9 is swung while guiding the arcuate cam surface 16 with the front end face of the fuel limiting bolt 15 to thereby stop the stopper rod 1.
2 is slid back and forth, and the pressure receiving portion 18 of the governor lever 17 is received from the rear side at the front end of the stopper rod 12 so as to limit the fuel injection amount of the fuel injection pump 1. The pressure receiving portion 18 of the governor lever 17
A spring force input lever 34 is provided.

While the boost pressure is not sufficiently increased, since the boost pressure 10 is also small, the diaphragm 5 is deformed rearward by the urging force 11 of the urging spring 7, and based on the swing posture of the swing lever 9. The stopper rod 12 advances to the front side, and the fuel receives the pressure receiving portion of the spring force input lever 34 against the front end face of the stopper rod 12, thereby restricting the swing of the spring force input lever 34. One fuel injection amount is limited. When the supercharging pressure is sufficiently increased, the boost pressure 10 also increases, and the diaphragm 5 is deformed forward against the urging force 11 of the urging spring 7, and the diaphragm 5 is stopped based on the swing posture of the swing lever 9. Since the rod 12 moves backward, the restriction on the fuel injection amount of the fuel injection pump 1 is released.

According to such a configuration, when the swing lever 9 is assembled at the time of engine production, the interlocking rod 8
It is only necessary to insert the bifurcated engagement portion 14 of the swing lever 9 attached to the lock pin 13 into engagement with the locking pin 13 and bring the arc-shaped cam surface 16 of the swing lever 9 into contact with the front end surface of the fuel limiting bolt 15. . When the swing lever 9 is to be removed during maintenance, the fork-like engaging portion 14 of the swing lever 9 is pulled out from the locking pin 13 to release the engagement, and the swing lever 9 is released together with the interlocking rod 8. Just remove it.

Further, the fuel limiting bolt 15 is
Can also be used as the swing fulcrum, so that the number of parts can be reduced. The front end face of the fuel limiting bolt 15 faces the rear end face of the stopper rod 12 from the rear side. In the case of the specification without a supercharger, since the components of the boost compensator together with the swing lever 9 become unnecessary, the stopper rod 12
Is directly received from the rear side to limit fuel during rated load operation.

Although the contents of the embodiment of the present invention are as described above, the contents of the present invention are not limited to the contents of the above embodiment. For example, in the above embodiment, the governor lever 17
Is a two-lever type, but this is a one-lever type,
It may be a three-wire type or others. Further, in the above embodiment, a diesel engine having a supercharger and a governor in a water-cooled vertical in-line three-cylinder was used, but an air-cooled, oil-cooled, horizontal, single-cylinder, multi-cylinder other than the three-cylinder, etc. It can be applied to various types of diesel engines.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a main part of an embodiment.

FIG. 2 is a vertical sectional side view of a main part of the embodiment.

FIG. 3 is a view in the direction of arrow A in FIG. 2;

FIG. 4 is a vertical sectional side view of a main part of a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel injection pump, 2 ... Metering rack, 3 ... Injection pump case, 4 ... Diaphragm case, 5 ... Diaphragm,
6 boost pressure introduction chamber, 7 urging spring, 8 interlocking rod, 9 swing lever, 10 boost pressure, 11 urging force of urging spring, 12 stopper rod, 13
Locking pin, 14: bifurcated engagement portion, 15: fuel limiting bolt, 16: arcuate cam surface, 17: governor lever, 18: pressure receiving portion.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-32945 (JP, A) JP-A-58-41228 (JP, A) JP-A-51-151426 (JP, A) 19938 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02D 1/00-1/18

Claims (1)

(57) [Claims] An injection pump case (3) accommodating the fuel injection pump (1) with a fuel increasing / decreasing direction of a metering rack (2) of the fuel injection pump (1) being a front-rear direction and a fuel increasing side being a rear side. ), A diaphragm case (4) is provided on the rear side, and the diaphragm (5) is accommodated in the diaphragm case (4).
The diaphragm (5) defines a boost pressure introducing chamber (6) in the diaphragm case (4), and communicates the boost pressure introducing chamber (6) with the intake passage.
The diaphragm (5) faces the (6) from the front side, and the diaphragm (5) is urged toward the boost pressure introducing chamber (6) by an urging spring (7).
An interlocking rod (8) slidable back and forth is attached to the front side of the arm, and a swing lever (9) is interlockingly connected to the interlocking rod (8), so that the boost pressure (10) introduced into the boost pressure introduction chamber (6) is increased. ) And the biasing force (11) of the biasing spring (7), the swinging lever (9) is swung by the unbalance force, and the fuel injection amount of the fuel injection pump (1) is adjusted based on the swinging posture. In the boost compensator for a turbocharged diesel engine, the base end of the swing lever (9) is pivotally attached to the front end of the interlocking rod (8). ), A stopper rod (12) is slidably supported back and forth, and a locking pin (13) is provided at the rear end of the stopper rod (12).
A bifurcated engagement portion (14) is provided at the tip of the swing lever (9), and the forked engagement portion (14) is removably engaged with the locking pin (13). A fuel limiting bolt (15) is provided on the rear side of the lever (9) so as to be capable of adjusting the front and rear screws. An arcuate cam surface (16) provided on the swing lever (9) is provided on the front end face of the fuel limiting bolt (15). Abut this fuel limit bolt
By swinging the swing lever (9) while guiding the arcuate cam surface (16) at the front end surface of (15), the stopper rod (12) is slid forward and backward, and the front end of the stopper rod (12) is moved. A diesel engine with a supercharger, wherein the pressure receiving portion (18) of the governor lever (17) is received from the rear side thereof to limit the fuel injection amount of the fuel injection pump (1). Boost compensator.