JP2838752B2 - Fuel limit position management jig for rack pin of engine fuel injection pump and fuel injection pump with fuel limit position management function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for managing a fuel limit position of a rack pin of a fuel injection pump for an engine and a fuel injection pump having a function of managing a fuel limit position. The present invention relates to a system for preventing a fuel limit position of a rack pin of a metering rack from being shifted from an appropriate position even when a governor is removed from an engine and replaced or reassembled.

[0002]

2. Description of the Related Art Conventionally, there is a speed control device for a diesel engine shown in FIG. This is because the fuel injection pump 1 is connected to the governing lever 101 via the governor lever 102 of the mechanical governor.
03, and a fuel limiting bolt 105 is opposed to the governor lever 102 from the fuel increasing side, and the governor lever 1 is connected to the fuel limiting bolt 105.
02 is set so as to set the fuel limit position 106 of the metering rack 104.

[0003] In an engine equipped with this type of governor,
Before shipment, the engine is operated by the manufacturer and the output state is checked with a dynamometer or the like.
Is adjusted so that an appropriate fuel limit position 106 of the metering rack 104 is set.

However, if the user removes the fuel injection pump 103 or the mechanical governor from the engine during maintenance and replaces or reassembles the fuel injection pump 103 or the mechanical governor, the assembled state of the fuel injection pump 103 and the mechanical governor deviates from the original state. Is left as it is, the fuel limit position of the metering rack 104 will deviate from the original appropriate position.

In this case, it is theoretically possible to correct the rise of the fuel limiting bolt 105 by the same operation as the initial setting on the manufacturer side. However, a correction operation requiring facilities such as a dynamometer is performed by the user. It is virtually impossible to do on the side. Therefore, after maintenance, the metering rack 104
The engine was used while the fuel limit position was shifted from the appropriate position.

[0006]

In the above prior art, after the user performs maintenance, the fuel limit position of the metering rack 104 shifts to the fuel increasing side, so that the fuel supply amount at the fuel limit position becomes excessive and the exhaust gas is exhausted. The unburned harmful components therein increased, and there was a possibility that the surrounding environment would be polluted. Further, when the fuel limit position of the metering rack 104 shifts to the fuel reduction side, the fuel supply amount at the fuel limit position may be insufficient, and the output of the engine may be reduced.

[0007] An object of the present invention is to prevent the fuel limit position of the metering rack from being shifted from the original appropriate position even when the user removes the fuel injection pump or mechanical governor from the engine during maintenance and replaces or reassembles the fuel injection pump or mechanical governor. It is to provide something that can be prevented.

[0008]

(First Invention) The first invention relates to a jig for managing a fuel limit position of a rack pin of a fuel injection pump of an engine, and as shown in FIGS. A fuel pin position limiting jig for a rack pin of a fuel injection pump of an engine used in place of the fuel injection pump 2 with respect to the pump housing case 1, which is equivalent to a mounting flange simulating the mounting flange 5 of the fuel injection pump 2. A part 6, a rack pin equivalent part 8 simulating a rack pin 7 of the fuel injection pump 2, and a pin mounting base 41 with the rack pin equivalent part 8 protruding from the front surface 42, so that the mounting flange equivalent part 6 can be accommodated in the pump housing case. When mounted on the rack 1, the rack pin equivalent portion 8 is configured to be connectable to the governor lever.

The bolt insertion slot 45 extending in the left-right direction of the mounting flange equivalent portion 6 is inserted into the mounting flange equivalent portion 6.
And the bottom surface 46 of the mounting flange equivalent part 6.
And a guide 47 for guiding the pin mounting base 41 in the left-right direction.
The pin mounting base 41 is engaged with the guide 47 so as to be able to be guided in the left-right direction, and the leg screw portion of the fixing bolt 50 is
The bolt head 55 of the fixing bolt 50 is seated on the top surface 48 of the mounting flange equivalent part 6 by being passed through the bolt insertion slot 45 from above and then screwed into the mounting flange equivalent part 6 and tightened. At the same time, the pin mounting base 41 is seated on the bottom surface 46 of the mounting flange equivalent part 6, and the pin mounting base 41 is fixed to the mounting flange equivalent part 6.

(Second Invention) The second invention relates to a fuel injection pump having a function of controlling the fuel limit of an engine, and as shown in FIG. A screw insertion slot 52 extending in the same direction as the rack pin 7 of the fuel injection pump 2 is opened in the rack cover 51 and fixed to the main body of the injection pump 2.
4, the metering rack 3 can be fixed to the rack cover 51 with fixing screws 53 screwed into the screw holes 54 through the screw insertion long holes 52.

[0011]

(First Invention) Two types of procedures in which a user removes a fuel injection pump or a mechanical governor from an engine and replaces or reassembles the engine during maintenance will be described.

The first procedure is as follows. That is, FIG.
The fuel injection pump 2 and the like shown in (B) are removed from the pump housing case 1 to perform engine maintenance. On the other hand, the management jig 11 shown in FIG. 1 (A) is such that when assembled to the pump housing case 1, the rack pin equivalent portion 8 is at a predetermined position according to the model and rotation specifications of the engine. The position of the pin mounting base 41 is adjusted. Then, as shown in FIG. 3, after attaching the mounting flange equivalent portion 6 of the management jig 11 to the pump housing case 1, the rack pin equivalent portion 8 is connected to the governor lever 12,
The margin of the fuel limiting bolt 13 is corrected so as to contact the governor lever 12. Thereafter, when the management jig 11 is removed from the pump housing case 1 and the fuel injection pump 2 is assembled, the fuel limit position 4 of the rack pin 7 of the metering rack 3 becomes the proper position set above, and the fuel limit position 4 The fuel is limited by the fuel limiting bolt 13, and the engine can be reused in that state.

The second procedure is as follows. This procedure is used when the setting position of the rack pin equivalent part 8 is unknown. First, only the fuel injection pump 2 is removed from the pump housing case 1. Next, as shown in FIG. 3, after attaching the mounting flange equivalent portion 6 of the management jig 11 to the pump housing case 1, the governor lever 12 is connected to the rack pin equivalent portion 8. Subsequently, the bolt head 55 of the fixing bolt 50 exposed from the pump housing case 1 is pinched, and the pin mounting base 41 is moved to move the governor lever 12.
Is brought into contact with the fuel limiting bolt 13. In this state, the fixing bolt 5 is positioned so that the rack pin equivalent portion 8 is positioned.
The pin mounting base portion 41 is fixed to the mounting flange equivalent portion 6 by tightening “0”.

Next, after removing the management jig 11 from the pump housing case 1 and performing maintenance of the engine, the management jig 11 is assembled into the pump housing case 1 again, and the same procedure as in the first procedure is performed. , Fuel limit bolt 13
Correct the birth of. Thereafter, when the management jig 11 is detached and the fuel injection pump 2 is assembled, the engine can be reused with the fuel limit position 4 of the rack pin 7 of the metering rack 3 returned to an appropriate position before maintenance.

(Second Invention) A description will be given of two types of procedures in a case where a user removes a fuel injection pump or a mechanical governor from an engine at the time of maintenance and newly assembles a fuel injection pump 56 illustrated in FIG. 4 as a replacement pump. I do.

The first procedure is as follows. First, remove the old pump from the pump housing case and perform engine maintenance. On the other hand, the fuel injection pump 56 illustrated in FIG. 4 is set such that the rack pin 7 is located at a predetermined fuel limit position 4 according to the model and rotation specifications of the engine when assembled in the pump housing case. In this state, the metering rack 3 is fixed to the rack cover 51 with fixing screws 53. And this fuel injection pump 56
After the rack pin 7 is connected to the governor lever and the protrusion of the fuel limiting bolt is corrected so as to contact the governor lever, the fuel limiting position 4 of the rack pin 7 of the metering rack 3 is set as described above. It is in the proper position, the fuel is restricted by the fuel restriction bolt 13 at the fuel restriction position 4, and the engine can be reused in that state.

The second procedure is as follows. This procedure is used when the setting position of the measuring rack 3 is unknown. First, remove only the old pump from the pump housing case. Next, as shown in FIG.
6 is assembled to the pump housing case, the governor lever is connected to the rack pin 7, and the metering rack 3 is moved integrally with the fixing screw 53 while holding the fixing screw 53 with a screwdriver or the like. Then, the governor lever is brought into contact with the fuel limiting bolt, and the fixing screw 53 is tightened to fix the metering rack 3 to the rack cover 51 so that the metering rack 3 is positioned in this state.

Next, after removing the fuel injection pump 56 from the pump housing case and performing engine maintenance, the fuel injection pump 56 is assembled into the pump housing case again, and the fuel restriction is performed in the same manner as in the first procedure. Correct the bolts. When the fixing screw 53 is loosened, the metering rack 3 can move in the fuel increase / decrease direction. That is, the fuel limit position 4 of the rack pin 7 of the metering rack 3 becomes an appropriate position before the maintenance, the fuel is limited by the fuel limit bolt 13 at the fuel limit position 4, and the engine can be reused in that state.

[0019]

【The invention's effect】

(First Invention) Even when the user removes the fuel injection pump or the mechanical governor from the engine during maintenance and replaces or reassembles the fuel injection pump or the mechanical governor, it is possible to prevent the fuel limit position of the metering rack from being shifted from the original appropriate position. For this reason, even if the engine is used after maintenance, excessive supply or insufficient supply of fuel at the fuel limit position is unlikely to occur, and adverse effects such as pollution of the surrounding environment due to unburned harmful components in exhaust gas and reduction in engine output will occur. Can be suppressed.

The movement of the pin mounting base is adjusted by pinching the bolt head of the fixing bolt, which is located on the top side of the pin mounting base exposed from the pump housing case.
This adjustment operation can be easily performed with the jig attached to the pump housing case.

(Second Invention) In addition to the effects of the first invention, the following effects are obtained. Since the metering rack is fixed so that it cannot move in any of the fuel increase and decrease directions by the fixing screw, it is possible to reliably prevent the metering rack from shifting and shifting when adjusting the allowance of the fuel limiting bolt, This allows the fuel limit bolt to be adjusted precisely.

[0022]

An embodiment of the present invention will be described with reference to the drawings.
1 and 2 are views for explaining a management jig according to a first embodiment of the present invention. The configuration of a diesel engine using this management jig is as follows. As shown in FIG. 1B, a pump housing case 1 is formed on the side of a cylinder block (not shown), and a Bosch type fuel injection pump 2 is inserted from a pump insertion port 14 on the upper side thereof.

The fuel injection pump 2 is provided with a mounting flange 5 in which a bolt insertion hole 15 and a knock pin insertion hole 16 are provided.
And open. The mounting seat 1 is located around the pump insertion port 14.
7, the mounting flange 5 is seated on the mounting flange 5 via a gasket 18, the mounting flange 5 is mounted on the mounting seat 17 with mounting bolts 19 inserted into the bolt insertion holes 15, and the fuel injection pump 2 is mounted on the pump housing case 1. It is assembled in. At this time, the knock pin 20 erected on the mounting seat 17 is fitted into the knock pin fitting hole 16 of the mounting flange 5 so that the mounting position of the fuel injection pump 2 does not shift.

A fuel injection cam shaft 21 is provided below the fuel injection pump 2, and a tappet 22 of the fuel injection pump 2 is mounted on the fuel injection cam 49. When the fuel injection cam 49 is rotated in conjunction with the crankshaft (not shown), the fuel is supplied to the combustion chamber (not shown) by the pump operation of the fuel injection pump 2 by raising and lowering the tappet 22. . The adjustment of the fuel supply amount is performed by the fuel injection pump 2
This is performed by sliding the metering rack 3 attached to the front and rear freely. The metering rack 3 is interlocked with the speed control lever 23 via a mechanical governor.

The structure of the mechanical governor is as follows. A governor lever shaft 24 is installed in the pump housing case 1 and the governor lever 12 is pivotally supported on the governor lever shaft 24. The governor lever 12 is of a two-lever type including a governor force input lever 25 and a spring force input lever 26, and each of the governor force input lever 25 and each lower end of the spring force input lever 26 is pivotally supported on a governor lever shaft 24. I have. A governor force generator 27 is provided in front of the governor force input lever 25.

A pair of front and rear slide guide pins 28 are provided at the upper end of the governor force input lever 25, and these are inserted into long front and rear pin insertion holes 30 formed in the slider 29, and are provided above the governor force input lever 25. A slider 29 is provided slidably forward and backward. The slider 29 is urged toward the fuel increasing side by the urging force 32 of the start spring 31. The slider 29 has a rack pin fitting portion 33.
, And the rack pins 7 of the measuring rack 3 are fitted therein.

A governor spring 34 is provided between the spring force input lever 26 and the speed control lever 23,
The spring force input lever 26 is urged toward the fuel increasing side by the spring force 35, and the spring force input lever 26 contacts the governor force input lever 25 from the rear side.
The fuel limiting bolt 13 is attached to the case front wall 36 of the pump accommodating case 1 so as to be freely screwable back and forth, and is opposed to the spring force input lever 26 from the fuel increasing side. By bringing the spring force input lever 26 into contact with the fuel limiting bolt 13, the fuel limiting position 4 of the metering rack 3 is set. An engine stop lever 37 is opposed to the slider 29 from the fuel increasing side.

In this mechanical governor, the governor force 38 generated in the governor force generator 27 in response to the rotation of the crankshaft (not shown) is input to the governor force input lever 25, and the spring force 35 of the governor spring 34 is increased. It is input to the spring force input lever 26. When the load on the engine fluctuates and the governor force 38 increases and decreases, the governor lever 12 swings integrally so that the moment between the governor force 38 and the spring force 35 is balanced, and the metering rack 3 moves. Thus, the actual engine speed is maintained at the set engine speed set by the speed control lever 23. Further, the spring force input lever 26 is connected to the fuel limiting bolt 13.
, The movement of the metering rack 3 in the fuel increasing direction is restricted.

When starting the engine, the governor force 3
8 does not occur, the spring force input lever 26
Abuts on the fuel limiting bolt 13 to limit its swing to the fuel increasing side, but the governor force input lever 25 is pulled toward the fuel increasing side by the urging force 32 of the start spring 31, so that the metering rack 3 is located at a start increasing position deviated from the fuel limit position 4 to the fuel increasing side, so that a smooth start can be performed.

When the slider 29 is pushed toward the fuel decreasing side by the engine stop lever 37, the slide of the slider 29 pushes the metering rack 3 to the no fuel injection position, and the engine stops. At this time, the spring force input lever 26 is left behind by the slide of the slider 29, so that the operation of the engine stop lever 37 does not oppose the strong spring force 35 of the governor spring 34, but the weak force 32 of the start spring 31. It can be performed with only a small operating force to resist.

The management jig 11 shown in FIG. 1A is a metering rack for the above-mentioned diesel engine when the user removes the fuel injection pump 2 or the mechanical governor from the engine and replaces or reassembles the engine during maintenance. The purpose is to prevent the fuel limit position 3 of 3 from deviating from the original proper position, and its configuration is as follows.

As shown in FIG. 1, this management jig 11
A mounting flange equivalent part 6 corresponding to the mounting flange 5 of the fuel injection pump 2, a rack pin equivalent part 8 corresponding to the rack pin 7 of the fuel injection pump 2, a rectangular block-shaped pin mounting base 41 to which the rack pin equivalent part 8 is attached; It has. The mounting flange equivalent part 6 includes a bolt insertion hole equivalent part 39 and a knock pin insertion hole equivalent part 40 corresponding to the bolt insertion hole 15 and the knock pin insertion hole 16 of the mounting flange 5.
Are provided.

Further, a long bolt insertion hole 45 is formed in the mounting flange equivalent portion 6 in the fuel increasing / decreasing direction, and a groove-like guide for guiding the pin mounting base 41 in the fuel increasing / decreasing direction is formed in the bottom surface 46 of the mounting flange equivalent portion 6. A guide 47 is formed, and the pin mounting base 41 is engaged with the guide 47. Then, the fixing bolt 5 inserted through the bolt insertion slot 45 is inserted.
At 0, the pin mounting base 41 is fixed to the mounting flange equivalent portion 6. The bolt head 55 of the fixing bolt 50 is seated on the top surface 48 of the mounting flange equivalent portion 6. As shown in FIG. 2, a pin fitting hole 43 is formed in the front surface 42 of the pin mounting base 41, and the rack pin equivalent part 8 is fitted therein.

Two types of procedures for the user to remove the fuel injection pump and the mechanical governor from the engine and replace or reassemble the engine during maintenance will be described.

The first procedure is as follows. First, the fuel injection pump 2 and the like shown in FIG. 1B are removed from the pump housing case 1 and maintenance of the engine is performed. Next, the rack pin-equivalent portion 8 of the management jig 11 shown in FIG. 1A is set at a predetermined position according to the model and rotation specifications of the engine, and as shown in FIG. The jig 11 is assembled to the pump housing case 1, and the rack pin corresponding portion 8 is connected to the rack pin fitting portion 33 of the slider 29 to position the slider 29.

Until the governor force input lever 25 stops, an artificial force 44 is applied thereto to position the governor force input lever 25. Then, the protrusion of the fuel limiting bolt 13 is corrected so as to contact the spring force input lever 26 positioned by the governor force input lever 25. Then, from the pump housing case 1 to the management jig 1
When the fuel injection pump 2 is assembled instead of the fuel injection pump 1, the engine can be reused without shifting the fuel limit position 4 of the metering rack 3 from the originally set appropriate position.

The second procedure is as follows. This procedure is used when the setting position of the rack pin equivalent part 8 is unknown. First, only the fuel injection pump 2 shown in FIG. next,
As shown in FIG. 3, the management jig 11 is
And the rack pin fitting portion 33 of the slider 29 is connected to the rack pin equivalent portion 8, and the bolt head 55 of the fixing bolt 50 on the top surface 48 side of the pin mounting base 41 exposed from the pump housing case 1 is attached. Pinch and pin mounting base 4
1 to move the spring force input lever 2
6 is brought into contact with the fuel limiting bolt 13, the rack pin equivalent portion 8 is positioned, and the pin mounting base 41 is fixed by the fixing bolt 50.
Is fixed.

Next, the management jig 11 is moved to the pump housing case 1.
After performing maintenance of the engine, the management jig 11 is assembled into the pump housing case 1 again, and in the same manner as the first procedure, the allowance of the fuel limiting bolt 13 is corrected. Remove the fuel injection pump 2
By assembling, the engine can be reused without shifting the fuel limit position 4 of the metering rack 3 from the originally set appropriate position.

Next, a fuel injection pump according to a second embodiment of the present invention will be described. FIG. 4 is an explanatory diagram of this fuel injection pump. The fuel injection pump 56 has a long screw insertion hole 52 long in the fuel increase / decrease direction on the rack cover 51 covering the metering rack 3, a screw hole 54 on the metering rack 3, and a screw hole insertion long hole 52. The metering rack 3 can be fixed to the rack cover 51 with fixing screws 53 screwed into the screw holes 54 through the holes.

When the user removes the fuel injection pump and the mechanical governor from the engine during maintenance, FIG.
The following describes two types of procedures for newly assembling the fuel injection pump 56 as an example of a replacement pump.

The first procedure is as follows. First, remove the old pump from the pump housing case and perform engine maintenance. Next, the metering rack 3 of the fuel injection pump 56 illustrated in FIG. 4 is moved and adjusted, and is set at a predetermined position in accordance with the model and rotation specifications of the engine. When assembled to the case, the rack pin 7 is connected to the governor lever, and the allowance of the fuel limit bolt is corrected so as to abut on the governor lever, the fuel limit position 4 of the metering rack 3 is properly set at the beginning. The engine can be reused without shifting from the position.

The second procedure is as follows. This procedure is used when the setting position of the measuring rack 3 is unknown. First, remove only the old pump from the pump housing case. Next, the fuel injection pump 56 illustrated in FIG. 4 is assembled to the pump housing case, the governor lever is connected to the rack pin 7, and the fixing rack 53 is integrated with the fixing rack 53 while pressing the fixing screw 53 with a screwdriver or the like. By moving, the governor lever is brought into contact with the fuel limiting bolt to position the metering rack 3, and the metering rack 3 is fixed with fixing screws 53.

Next, after removing the fuel injection pump 56 from the pump housing case and performing maintenance on the engine, the fuel injection pump 56 is assembled into the pump housing case again, and the fuel restriction is performed in the same manner as in the first procedure. When the bolt allowance is corrected and the fixing screw 53 is loosened, the engine can be reused without shifting the fuel limit position 4 of the metering rack 3 from the originally set appropriate position.

In the description of each of the above embodiments, FIG.
Although the use of a diesel engine having a two-lever governor lever 12 shown in (B) has been described, the management jig and the pump of the present invention are also applicable to a diesel engine having a single-lever governor lever. Can be used for

[Brief description of the drawings]

FIGS. 1A and 1B are views for explaining a management jig according to a first embodiment of the present invention. FIG. 1A is a front view of the management jig, and FIG. FIG. 2 is a vertical sectional front view of a peripheral portion of a fuel injection pump that performs the above.

FIG. 2 is a perspective view of the management jig of FIG.

FIG. 3 is a diagram corresponding to FIG. 1B in which the management jig of FIG. 1A is assembled in a pump housing case.

4A and 4B are explanatory views of a fuel injection pump according to a second embodiment of the present invention. FIG. 4A is a front view of the pump, and FIG. 4B is a cross-sectional view taken along line BB of FIG. 4A. It is.

FIG. 5 is a diagram corresponding to FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pump accommodating case, 2 ... Fuel injection pump, 3 ... 2 metering rack, 4 ... 3 fuel limiting position, 5 ... 2 mounting flange, 6 ... Mounting flange equivalent part, 7 ... Rack pin, 8 ...
Rack pin equivalent portion, 41: pin mounting base, 45: bolt insertion slot, bottom surface of 46: 6, 47: guide, 48: 6
Top surface, 50 ... fixing bolts, 51 ... rack cover, 5
2: long screw holes, 53: fixing screws, 54: screw holes.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02M 59/28 F02D 1/04 F02M 59/44

Claims (2)

(57) [Claims] 1. An engine pump housing case (1)
To replace the fuel injection pump (2)
Fuel injection pump rack pin fuel limit position management jig
A is the attachment flange (5) Preparative simulating <br/> flanged portion corresponding to the fuel injection pump (2) and (6), simulating a Rakkupin (7) of the fuel injection pump (2) Rakkupin corresponding section (8), by Rukoto a pin and mounting base (41) which projects into the La <br/> Kkupin corresponding section (8) front (42), said mounting flange corresponding portion
When (6) is attached to the pump housing case (1),
The rack pin equivalent part (8) can now be connected to the governor lever
So as to constitute, the mounting flange corresponding portion bolt insertion long hole extending in the lateral direction of (6) (45) with opened to the mounting flange corresponding portion (6), the bottom surface of the mounting flange corresponding portion (6) (46)
Guide the pin mounting base (41) is guided in the lateral direction
(47) is formed, the guide said pin mounting base in (47) (41)
The guidably engaged to said lateral direction, a fixing bolt (5
0) from above the bolt insertion slot (45).
After passing through, screw fitting to the above mounting flange equivalent part (6)
To secure the fixing bolt (50).
Attach the bolt head (55) to the top surface (4
8) and the pin mounting base (41)
Sit on the bottom (46) of the mounting flange equivalent part (6)
Fix the pin mounting base (41) to the mounting flange equivalent part (6).
Rakkupi were, of the fuel injection pump of the engine, characterized in that
Emissions of the fuel limiting position management jig. 2. A rack cover (51) for covering a metering rack (3) of the fuel injection pump (2) is attached to a main body of the fuel injection pump (2).
And fix the fuel injection pump to the rack cover (51).
(2) Open the Rakkupin (7) moving direction and extending in the same direction as bi <br/> scan insertion long hole (52) of the screw hole in the adjusting rack (3)
(54) opened at fixing screw which is screwed into the screw hole (54) through the screw insertion slot (52) (53), the adjusting rack
(3) was was configured to be fixed to the rack cover (51) <br/>, fuel limiting position with management function of the engine, characterized in that
Fuel injection pump.