JP3323378B2 - Fuel limit position management jig for fuel injection pump of diesel engine and fuel limit position management method - 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 fuel injection pump for a diesel engine.

[0002]

2. Description of the Related Art In a diesel engine equipped with a speed control device, a fuel injection pump is controlled by adjusting the limit position of a fuel limiting device while operating the engine on a manufacturer side before shipment and checking the output state with a dynamometer or the like. Is set to an appropriate fuel limit position.

However, when the user removes the fuel injection pump or mechanical governor from the engine during maintenance and reassembles the fuel injection pump or the mechanical governor, or replaces the fuel injection pump with a new fuel injection pump, the assembled state of the fuel injection pump and the mechanical governor deviate from the original state. If the limit position of the apparatus is left as it is, there is a problem that the fuel limit position of the metering rack deviates from the original appropriate position. In this case, it is theoretically possible to send the engine to a predetermined maintenance shop for each maintenance and correct the fuel limit position of the fuel limiter with the dynamometer or the like on the manufacturer side in the same way as the initial setting,
Costly and impractical.

[0004] Therefore, when the fuel injection pump or the mechanical governor is removed from the engine during maintenance and reassembled, there is a possibility that the fuel injection pump or the mechanical governor may be operated with the fuel limiting position of the metering rack deviated from the original appropriate position. If the fuel limit position of the metering rack shifts to the fuel increasing side, the fuel supply amount at the fuel limit position becomes excessive, harmful components in the exhaust gas may increase, and the surrounding environment may be polluted. If the fuel limit position is shifted to the fuel reduction side, the fuel supply at the fuel limit position may be insufficient and the output of the engine may be reduced.

In order to solve such a problem, the present applicant has already disclosed in Japanese Patent Application Laid-Open No. Hei 6-58222 that even if the fuel injection pump or mechanical governor is removed from the engine and reassembled during maintenance of the engine, the fuel limit of the metering rack is limited. A fuel limiting position management jig for a fuel injection pump of a diesel engine, which can prevent the position from deviating from the original appropriate position, is proposed.

In the fuel limit position management jig proposed in Japanese Patent Application Laid-Open No. 6-58222, the predetermined injection amount from the fuel injection pump depends on the distance from a positioning means such as a knock pin fitting hole of the fuel injection pump. It is intended for precisely defined fuel injection pumps. However,
Depending on the type of the fuel injection pump, there is a fuel injection pump in which a predetermined injection amount from the fuel injection pump is not accurately defined by a distance from a positioning means such as a knock pin insertion hole. Predetermined injection amount rack position of such fuel injection pump is different for each fuel injection pump, the injection characteristic for each fuel injection pump examined before shipment, the rack position serving as a predetermined injection quantity, the fuel injection pump The main body and the rack are provided with engraved lines, respectively, and a position where the two engraved lines coincide is a rack position corresponding to a predetermined injection amount (Q set) of the fuel injection pump.

FIG. 6 is a view for explaining a procedure for mounting a fuel injection pump of the type in which the above-mentioned two cutting lines are aligned to a pump housing case of a diesel engine. In FIG. 6, a metering rack 104 of a fuel injection pump 103 is interlockedly connected to a speed control lever 101 via a governor lever 102 of a mechanical governor, and a tip end portion 105a of a fuel limiting device 105 is opposed to the governor lever 102 from a fuel increasing side. The fuel limiting position of the metering rack 104 is set by receiving the contact portion 106 of the governor lever 102.

The fuel injection pump 102 has a body-side engraved line 107 engraved on the body thereof, and the metering rack 104 has an engraved rack-side engraved line 108 formed thereon.
The position where 07 and 108 coincide is the position where the predetermined injection amount can be obtained. Therefore, when determining the fuel limit position, the pump housing case 10 of the fuel injection pump 102 is used.
After the fuel injection pump 103 is mounted on the engine by fitting the pump mounting base 111 of the fuel injection pump 103 into the mounting fitting part 110 of No. 9, the rack pin fitting part 113 of the governor lever 102 is connected to the rack pin 112 of the metering rack 104. Fit. And two engraved lines 107,
The governor lever 102 is tilted to the position where the 108 is matched, and the contact portion 106 of the governor lever 102 is
By moving the fuel restricting device 105 forward and backward and fixing it so that the tip end portion 105a of the fuel restricting device 105 is located at the same position, the fuel restricting position of the metering rack 104 can be set.

[0009]

However, in the above-mentioned conventional method of line marking, the pump housing case 10
Due to the arrangement of 9, it is necessary to remove parts such as the gear case or the fuel injection pump case cover to perform the marking line alignment work. This causes a problem that the error increases. In addition, the distance from the mounting reference of the fuel injection pump (for example, the mounting fitting portion 110, the reference knock pin hole, etc.) to the predetermined fuel injection amount position, that is, the position where the marking line coincides, is strictly set in each individual fuel injection pump. If you manage to match and even position the mounting reference,
It is conceivable that the fuel limit position can be automatically set. However, since a new adjustment step is required in addition to the conventional fuel injection pump manufacturing process, it is difficult to realize this from the viewpoint of cost.

Further, the fuel limit position must be changed for each engine depending on the specifications of the engine and other conditions (output set reference, output characteristics of the engine, etc.), so that the conventional ruled line alignment method is applied. Many types of fuel injection pumps with marking lines at predetermined positions are required according to various conditions such as engine specifications, etc.Management of many fuel injection pumps with the same type of fuel injection pump and different only in the marking line position A problem that must be done.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a jig and a method for managing a fuel limit position of a fuel injection pump for a diesel engine, which can accurately adjust the fuel limit position with a simple structure. . Another object of the present invention is to
There is a case where a fuel limit position management jig and a management method for a fuel injection pump of a diesel engine, which can accurately perform exchange of a fuel limit position corresponding to various rack pin settings of different models, are provided.

[0012]

According to the first aspect of the present invention, there is provided a fuel injection pump for a diesel engine having a fuel restriction position management jig according to the present invention. A fuel limit position management jig for a fuel injection pump for a diesel engine, which manages a fuel limit position of a metering rack 3 of a fuel injection pump 2 housed in a pump housing case 1; It is composed of a dedicated base 42 and a Q set adapter 43, and the Q set adapter 43 is
To the pin mounting base 4
7 and the sliding shaft 48 is slid horizontally at the tip.
A shaft hole 49 for supporting the shaft hole 49 in a direction in which the shaft hole 49 extends;
Along the shaft hole 49, a long hole opening 50 is provided.
The hole opening 50 is used to connect the mounting flange equivalent portion 44 to the engine pump.
When it is seated on the mounting seat 17 of the
Structured so as to be provided on the surface 51 in the direction in which the pins 7 are erected
And, Rakkupin equivalent to section 46 of the Q set adapter unit 43
The sliding shaft 48 is fitted and fixed at a predetermined position, and the slot is opened.
It is erected through the port 50 and the sliding shaft 48 moves horizontally.
As a result, the position of the rack pin equivalent portion 46 is
Along, configured so as to be movable in the horizontal direction, the adapter side positioning means 56 for positioning the Q set adapter unit 43 when attached to Q set adapter unit 43 in the pump housing case 1, corresponds Rakkupin a predetermined Rakkupin position And a fixing means 53 for fixing the portion 46. The dedicated base portion 42 includes the fuel injection pump 2 and the Q set adapter portion 43.
Is attached to the special base 42, the special base 42
A dedicated base side positioning means 73 for positioning the fuel injection pump 2 and the Q set adapter unit 43 with respect to the reference rack position determined by the engraved lines 10 and 11 of the fuel injection pump 2 and copied to the dedicated base unit 42. Rack position for driving the rack pin equivalent portion 46 in the rack pin moving direction
Da detecting the location adjustment bolt 66, when fitted with Q set adapter unit 43 to a dedicated base unit 42, a movement amount of the corresponding portion 46 Rakkupin from Utsushitora reference rack position
It has an ear gauge 68 and the dedicated base 42 is in the center
A support plate 61 having an opening 60 is erected on a bottom plate 62 to support
A pair of arms 63,
64, and the arm 63 on one side has the rack position adjustment.
The fixing bolt 66 is fixed, and the arm 64 on the other side is
A mounting hole 67 is formed in the
Through the stem 69 of the gauge 68
The gauge 68 is fixed, and the support plate 61 of the dedicated base 42 is Q
Remove the mounting flange equivalent part 44 of the set adapter part 43
When attached, the sliding shaft 48 is provided through the opening 60.
The contact point 71 of the dial gauge 68 can contact the
Rack position adjusting bolt 66 abuts on pin 46
It is characterized in that it can be configured .

According to a second aspect of the present invention, there is provided a method for managing a fuel limit position of a fuel injection pump for a diesel engine, the fuel injection pump being housed in the pump housing case using the fuel limit position managing jig according to the first aspect. 2. A method for managing a fuel limit position of a fuel injection pump of a diesel engine for managing a fuel limit position of a second metering rack 3, comprising: {a} attaching a fuel injection pump 2 to a dedicated base 42; {Step of copying the reference rack position by the rack position adjusting bolt 66 at the position where the marking lines 10 and 11 of the fuel injection pump 2 are matched; and {c} Removing the fuel injection pump 2 from the dedicated base 42, setting and attaching a set adapter portion 43, the position of Rakkupin corresponding portion 46 on the basis of the reference rack position of {d} rack position adjusting bolt 66 Then With
The reference rail set by the rack position adjustment bolt 66
From the lock position, measure the distance with the dial gauge 68.
While moving it a predetermined length while
Setting the rack at a fixed rack position; attaching the {e} Q set adapter section 43 to the pump housing case 1 of the engine;
Setting a fuel limit position of the engine based on the position.

According to a third aspect of the present invention, there is provided a fuel limiting position management jig for a diesel engine fuel injection pump.
Fuel limit position management of fuel injection pump for diesel engine
In the jig, the adapter-side positioning means 56
The mounting base equivalent part 56, the dedicated base side positioning
The means 73 is a fitting equivalent part 73 .

[0015]

The operation of the fuel limit position management jig of the fuel injection pump of the diesel engine according to the first aspect is achieved by the steps {a} to {e} as described in the limit position management method according to the second aspect. Is performed in the following procedure. According to the fuel limit position management jig, it is possible to accurately and easily set the fuel limit position of the fuel injection pump of the type in which the position at which the marking line is aligned fluctuates in each pump.

According to the fuel limit position management method of the present invention, the two sets of simple jigs of the Q set adapter section 43 and the dedicated base section 42 are prepared, and the positions where the marking lines are aligned are set to the individual pumps. with the fuel limiting position of the fuel injection pump of the type that varies can be set accurately and easily in, rat
Reference rack copied by the lock position adjustment bolt 66
Do not measure the moving distance from the position with the dial gauge 68.
Has a wide variety of rack positions by changing
One fuel limit position for each specification engine fuel limit position
It can be set with the management jig .

[0017]

As described above, according to the first aspect of the present invention, the following specific effects can be obtained. (A) The fuel limiting position of the fuel injection pump of the type in which the position where the marking line is aligned fluctuates in each pump can be accurately and easily set in the engine of the actual machine. (B) By dividing the structure of the jig into two parts, a Q set adapter part and a dedicated base part, it is possible to reduce the size of the part to be attached to the engine. As a result, the present invention can be applied to an engine having a small size of one cylinder or two cylinders. (C) Since the dedicated base has the reference position copying means and the length measuring means, the adjustment work can be facilitated. The dedicated base has a support plate having an opening in the center at the bottom plate, and a pair of arms protruding at both sides of the opening on one side of the support plate. The adjustment bolt is fixed, and the other arm has a mounting hole in the horizontal direction. The stem of the dial gauge is inserted into this mounting hole to fix the dial gauge and support the dedicated base. When a part corresponding to the mounting flange of the Q set adapter part is attached to the plate, the measuring element of the dial gauge can abut on the sliding shaft through the opening, and the rack position adjusting bolt abuts on the part corresponding to the rack pin. Since the configuration is such that the rack pins can be accurately positioned.

According to the second aspect of the present invention, a fuel system of a system in which the position where the marking line is aligned fluctuates in each pump simply by preparing two simple jigs of a Q set adapter portion and a dedicated base portion. In addition to being able to accurately and easily set the fuel limit position of the injection pump, the fuel limit position can be set according to the specifications of each engine in one type of fuel injection pump, and the cost can be reduced compared to the conventional method. Has a unique effect.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings showing embodiments. Fig. 1 shows the dedicated base 4
FIG. 2 is a perspective view showing a configuration of a fuel limit position management jig 41 including a fuel cell 2 and a Q set adapter 43, and FIG.
3A is a partial cross-sectional plan view showing a state in which the fuel injection pump 2 is attached to the base, FIG. 3A is a partial cross-sectional plan view showing a state in which the Q set adapter section 43 is mounted on the dedicated base 42, and FIG. FIG. 3C is a front elevational view showing a state where the Q set adapter section 43 is assembled to the exclusive base 42, and FIG. 3C is a side longitudinal sectional view showing a state where the Q set adapter section 43 is assembled to the exclusive base 42.
4A is a diagram showing the vicinity of a pump housing case of a diesel engine using the management jig 41, and FIG. 4B is a drawing showing the vicinity of a metering rack of the fuel injection pump.

In the diesel engine shown in FIG. 4, a pump housing case 1 is formed on a 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 is formed. A mounting seat 17 is formed around the pump insertion port 14, the mounting flange 5 is seated on the mounting seat 17 via a gasket 18, and the mounting flange 5 is mounted on the mounting seat 17 with a mounting bolt 19 inserted into the bolt insertion hole 15. The fuel injection pump 2 is assembled to the pump housing case 1.

At this time, a part of the pump insertion port 14 is precisely machined to form a mounting fitting portion 20, and a pump mounting base 21 of the fuel injection pump 2 is assembled to the mounting fitting portion 20, and a pump positioning means is provided. And It should be noted that instead of the configuration for forming the mounting fitting portion 20 shown in FIG.
Alternatively, a knock pin insertion hole may be provided, and a knock pin may be inserted into the knock pin insertion hole so that the mounting position of the fuel injection pump 2 does not shift. FIG. 4 shows the fuel injection pump 2
As shown in (B), the body side marking line 1 is attached to the pump body.
0 indicates that the rack-side engraved line 11 is engraved on the metering rack 3, and a position where these engraved lines 10 and 11 coincide is a position where a predetermined injection amount (for example, a maximum injection amount) is obtained. .

The adjustment of the fuel supply amount of the fuel injection pump 2 is as follows.
The adjustment is performed by sliding a metering rack 3 attached to the fuel injection pump 2 so as to be slidable back and forth. The metering rack 3 is linked from the speed control lever 23 via a mechanical governor. The structure of the mechanical governor is as follows. A governor lever shaft 24 is erected in the housing 1 and a predetermined lower position of the governor lever 12 is pivotally supported by the governor lever shaft 24 in a swingable manner. Governor lever shaft 24
A governor shaft 25 is laid horizontally on the lower rear side, and the lower end 27 of the governor lever is urged in the direction of the arrow (governor force 28) in the figure by the rotation of the governor weight 26.

A rack pin fitting portion 29 is provided at the upper end of the governor lever 12, and the rack pin 7 of the metering rack 3 is fitted into the rack pin fitting portion 29. Governor lever 12
A governor spring 34 is interposed between the spring support arm 30 and the speed control lever 23, and the governor lever 12 is biased by the spring force 35 toward the fuel increasing side. The fuel restricting device 13 is screwed to the case front wall 36 of the pump housing case 1 so as to be able to advance and retreat, and is opposed to the contact portion 8 of the governor lever 12 from the fuel increasing side.
By bringing the contact portion 8 of the governor lever 12 into contact with the fuel limiting device 13, the fuel limiting position of the metering rack 3 is set.

In this mechanical governor, during low-speed to high-speed operation, a governor force 28 generated on a governor shaft 25 that rotates in conjunction with a crankshaft (not shown) is input to the governor lever lower end 27 and the governor spring 34 The spring force 35 is input from the spring support arm 30 to the governor lever 12. Then, the load on the engine varies, the governor force 28 is increased or decreased variation, the governor force
The governor lever 12 swings together so that the moment of the spring force 35 and the moment of the spring force 35 are balanced, the metering rack 3 moves, and the actual engine speed is maintained at the speed set by the speed adjusting lever 23. . Further, when the contact portion 8 of the governor lever 12 contacts the fuel limiting device 13, the movement of the metering rack 3 in the fuel increasing direction is limited, and the maximum output is limited.

When the engine is started, the governor lever 1 is set to the operating position (A direction) when the governor lever 23 is in the operating position (direction A).
2 is pulled in the direction C by the governor spring 34. At this time, centrifugal force does not act on the governor weight 26 because the engine is not rotating, and the governor lever 12 is connected to the fuel limiting device 1.
The metering rack 3 moves to the maximum fuel injection position by abutting on the distal end 13a of the fuel cell 3 to facilitate starting. Speed control lever 23
Is in the idling position (B position), the governor spring 34 hardly acts, and the idle spring 37
Governor force 2 with small tension and governor weight 26
The idling operation is performed in a state where the motor 8 is balanced.

When the speed control lever 23 is fully moved in the direction B when the engine is stopped, the governor spring 34 moves the governor lever 12 in the direction D, bringing the metering rack 3 to the stop position (fuel injection amount 0) and stopping the engine. . FIG.
The fuel limit position management jig 41 shown in FIG. 4 removes the fuel injection pump 2 and the mechanical governor shown in FIG.
Alternatively, this is for preventing the fuel limiting position of the metering rack 3 from being shifted from the original appropriate position when re-assembled, and the configuration is as follows.

The fuel limiting position management jig 41 is roughly composed of a dedicated base 42 and a Q set adapter 43. The Q set adapter section 43 includes the fuel injection pump 2
A flat plate-like mounting flange equivalent portion 44 corresponding to the mounting flange 5, a pin equivalent portion movement receiving portion 45 attached to the mounting flange equivalent portion 44, and a movably supported portion within the pin equivalent portion moving receiving portion 45. And a rack pin equivalent portion 46.

As shown in FIG. 1, the Q set adapter portion 43 has a pin mounting base portion 47 suspended from a mounting flange portion 44 and a shaft hole for supporting a sliding shaft 48 at the end thereof so as to be slidable in the horizontal direction. 49 are provided. An elongated opening 50 is provided along the extending direction of the shaft hole 49 so as to extend over the entire area of the shaft hole 49. The slot opening 50 is provided on the surface 51 that is in the direction in which the rack pins 7 stand when the mounting flange 44 is seated on the mounting seat 17 of the pump housing case 1.

The rack pin equivalent portion 46 of the Q set adapter portion 43 is fitted and fixed to a predetermined position of the sliding shaft 48,
Since the slide shaft 48 is erected through the elongated hole opening 50, the position of the rack pin equivalent portion 46 moves in the horizontal direction along the elongated hole opening 50 by the horizontal movement of the slide shaft 48. Further, a screw hole 52 is provided at a predetermined position of the shaft hole 49, and a set screw 53 is screwed into the screw hole 52, and the set screw 53 is tightened to the slide shaft 48, so that a rack pin equivalent portion 46 is formed.
Can be fixed at a predetermined position. The pin mounting base 47, shaft hole 49, sliding shaft 4
8 and the long hole opening 50 constitute a pin equivalent portion movement receiving portion 45.

At the lower part of the mounting flange equivalent part 44, FIG.
A fitting portion 56 corresponding to a pump mounting base fitted to the mounting fitting portion 20 shown in FIG. The positions of the bolt insertion hole equivalent portion 55 and the pump attachment base equivalent portion 56 with respect to the attachment flange equivalent portion 44 shown in FIGS. 1 and 3 are different from the positions of the bolt insertion hole 15 and the pump attachment base 21 with respect to the attachment flange 5 shown in FIG. Positions are set to match each other.

The dedicated base 42 has a support plate 61 having an opening 60 at the center thereof is provided upright on the bottom plate 62, and a pair of arm portions 63 and 64 are protruded from both sides of the opening 60 on one side 61a of the support plate. I have. As shown in FIG. 2 (B), a mounting hole 67 is formed in the right arm 63 in the horizontal direction, and a stem 69 of a dial gauge 68 as a length measuring means is inserted through the mounting hole 67 so that a set screw 70 is formed. The dial gauge 68 is thereby fixed. Further, as shown in FIG. 2B, a screw hole 65 is formed in the left arm portion 64 in a horizontal direction, and a rack position adjusting bolt 66 is screwed into the screw hole 65. By rotating the position adjusting bolt 66, the rack position adjusting bolt 66 is configured to be able to move forward and backward.

The measuring element 71 of the dial gauge 68 has an opening 6
It is arranged at a position protruding to zero. Around the opening 60 of the support plate 61, three bolt screw holes 72 are provided corresponding to the bolt insertion holes 15. Further, the upper part of the opening 60 is configured to be a fitting equivalent part 73 corresponding to the mounting fitting part 20. The pump mounting base portion 56 of the Q set adapter portion 43 is fitted into the fitting portion 73 of the dedicated base portion 42, and the Q set adapter portion 4 is
When the base 3 is fixed to the dedicated base 42, the positions of the Q set adapter 43 and the dedicated base 42 can be set with high accuracy.

The processing operation when the fuel injection pump 2 and the mechanical governor are removed from the engine and reassembled during maintenance will be described with reference to the flowchart of FIG. FIG. 5A is a flowchart illustrating the basic processing of the output setting method according to the present embodiment. FIG.
In FIG. 4A, in step SP1, the fuel injection pump 2 and the like shown in FIG. 4A are detached from the pump housing case 1 to perform maintenance, and preparation for replacement of the fuel injection pump 2 (adjustment amount of the replacement pump) is performed. , Etc.), and in step SP2, the dedicated base 4
2, the Q set transfer process to the Q set adapter unit 43 and the adjustment process are performed in step SP3, and the Q set adjustment from the Q set adapter unit 43 to the actual engine is performed in step SP4. To terminate a series of processing.

FIG. 5 (B) shows the step SP2 of FIG. 5 (A).
It is a flowchart for explaining the details of the processing of,
In step SP2a, if the pump is replaced, for example, the repair fuel injection pump to be replaced (new product) is attached to the dedicated base 42 (the state of FIG. 2), and step S2a is performed.
At P2b, the two engraved lines of the body-side engraved line 10 and the rack-side engraved line 11 of the fuel injection pump are made to coincide with each other by the rack position adjusting bolt 66 of the dedicated base portion 42 (the state of FIG. 2), and are made to coincide at Step SP2c. Lock the rack position adjusting bolt 66 with the nut 74 at the position
At 2d, the repair fuel injection pump is removed from the dedicated base 42.

FIG. 5 (C) shows step SP3 of FIG. 5 (A).
It is a flowchart for explaining the details of the processing of,
At step 3a, the Q set adapter 43 is attached to the dedicated base 42 from which the repair fuel injection pump was removed (the state of FIGS. 3A to 3C), and step SP3b
In the state where the dial gauge 68 is attached to the right arm 63 of the special base 42 (the state shown in FIGS. 3A to 3C).
Then, the probe 71 of the dial gauge 68 is applied from the right side of the sliding shaft 48 and pushed in by 1 to 2 mm, and the position of the rack pin equivalent part 46 is set to the position set by the rack position adjusting bolt 66. The value is set as a zero point reference point. Then, in step SP3c, the rack pin equivalent portion 46 of the Q set adapter section 43 is moved left and right with the dial gauge 68 by the rack position adjusting bolt 66 corresponding to the predetermined rack position corresponding to each engine specification with reference to the zero point reference point. The rack pin equivalent portion 46 is fixed by adjusting the rack position of the rack pin equivalent portion 46 by looking at the scale and by tightening the slide shaft 48 with the set screw 53 at the adjusted position.

FIG. 5D shows step SP4 of FIG. 5A.
It is a flowchart for explaining the details of the processing of,
In step 4a, the Q set adapter section 43 is removed from the dedicated base section 42, the Q set adapter section 43 is attached to the pump housing case 1 of the engine, and the rack pin fitting section 29 of the governor lever 12 of the engine is fitted to the rack pin equivalent section 46. State. And step SP4
b, screw it in until the tip 13a of the fuel limiting device 13 lightly touches the contact portion 8 of the governor lever 12, locks the position of the fuel limiting device 13 at the contact position, and in step SP4c, removes the Q set adapter from the pump housing case 1. The unit 43 is removed, and a new fuel injection pump is attached instead (the state of FIG. 4A), and the series of processing ends.

The position of the rack pin equivalent portion 46 in step SP4a of FIG. 5D is, as described above, a reference at which the two injection lines of the fuel injection pump 2 and the metering rack 3 shown in FIG. Since the setting is made when the predetermined length is adjusted from the rack position according to the specification of the engine, by adjusting the distal end portion 13a of the fuel limiting device 13 according to the position of the rack pin equivalent portion 46, It can be located at an appropriate fuel limit position according to the engine specifications and the like. In this way, even if the rack pin positions of the Q set adapter section 43 are made different from each other, even if the rack pin positions are different due to the specifications of the engine, it is possible to cope with the same part number of the fuel injection pump. The movement width of the rack pin position is, for example, about 0.1 mm to 5.0 mm.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the present invention. Hereinafter, such an embodiment will be described.

(1) In the above embodiment, the dial gauge 68 is exemplified as the length measuring means because a spring is provided in the dial gauge 68 and pressed against the sliding shaft 48, so that the error is small and the cost is low. This is because the advantage is that there is little individual difference in reading.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a fuel restriction position management jig.

FIG. 2 is a partial cross-sectional plan view showing a state where a fuel injection pump is mounted on a dedicated base.

FIG. 2 (A) is a partial cross-sectional plan view showing a state where a Q-set adapter section is attached to a dedicated base section, and FIG. 2 (B) is a state showing a state where a Q-set adapter section is attached to the dedicated base section. FIG. 2 (C) is a side longitudinal sectional view showing a state where a Q set adapter unit is attached to a dedicated base unit.

4A is a view showing the vicinity of a pump housing case of a diesel engine using a management jig 41, FIG.
(B) is an extraction figure near the metering rack of the fuel injection pump.

5 (A) to 5 (D) are fuel limit position management jigs,
It is a flow chart for explaining a fuel restriction position management method.

FIG. 6 is a diagram for explaining a conventional fuel limit position setting method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pump storage case, 2 ... Fuel injection pump, 3 ... Metering rack, 5 ... Mounting flange, 7 ... Rack pin, 10 ... Body side marking line, 11 ... Rack side marking line, 17 ... Mounting seat, 41
... Fuel restriction position management jig, 42 ... Dedicated base, 43 ... Q
Set adapter part, 44 ... Mounting flange equivalent part, 45 ...
Pin-equivalent part movement receiving part, 46 ... Rack pin-equivalent part, 47 ...
Pin mounting base, 48: sliding shaft, 49: shaft hole, 50: long hole
Opening, 51: Surface in the direction in which the rack pins are erected, 53: Set screw, 56: Equivalent part of pump mounting base, 60: Opening, 6
DESCRIPTION OF SYMBOLS 1 ... Support plate, 61a ... One side of a support plate, 62 ... Bottom plate, 63,
64: A pair of arms 66: Rack position adjustment bolt 67
... Mounting hole, 68 ... Dial gauge, 69 ... Stem, 7
Reference numeral 1 denotes a probe, 73 denotes a fitting equivalent part.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02M 59/44 F02M 59/28

Claims (3)

(57) [Claims] 1. A fuel limit position management jig for a fuel injection pump of a diesel engine for managing a fuel limit position of a metering rack (3) of a fuel injection pump (2) housed in a pump housing case (1). The fuel limiting position management jig (41) is composed of a dedicated base (42) and a Q set adapter (43), and the Q set adapter (43) has a mounting flange (2) for the fuel injection pump (2). mounting flange corresponding portion corresponding to 5) from (44)
A pin mounting base (47) is suspended and a sliding shaft is attached to its tip.
A shaft hole (49) for supporting the (48) slidably in the horizontal direction.
The shaft hole (4) extends along the direction in which the shaft hole (49) extends.
9), a slot opening (50) is provided facing the slot opening (5).
0) is an engine pump equivalent to the mounting flange (44).
When seated on the mounting seat (17) of the storage case (1),
The rack pin (7) is provided on the surface (51) that is in the upright direction.
And the rack pin equivalent part (4) of the Q set adapter part (43).
6) is fitted and fixed to a predetermined position of the sliding shaft (48),
Standing through the slot opening (50), the sliding shaft (4)
8), the rack pin equivalent portion (4)
The position of 6) is shifted horizontally along the slot opening (50).
Configured to allow dynamic and, Q set adapter part and the adapter side positioning means for positioning the Q set adapter unit when mounted (43) to the pump housing case (1) (43) (56), a predetermined Rakkupin position Fixing means (5) for fixing the rack pin equivalent portion (46)
When the fuel injection pump (2) and the Q set adapter (43) are attached to the dedicated base (42), the dedicated base (42) is provided. Injection pump (2) for Q), Q
A dedicated base side positioning means (73) for positioning the set adapter part (43), and a score line (10) for the fuel injection pump (2)
The reference rack position determined by (11) is used for the dedicated base
(42) and a rack position adjusting bolt ( 6) for driving the rack pin equivalent part (46) in the rack pin moving direction.
6) and the Q set adapter section (43) to the dedicated base section (42)
When mounted on a dial, this dial detects the amount of movement of the rack pin equivalent part (46) from the copied reference rack position.
And a gauge (68), a dedicated base unit (42) is supported with an opening (60) in the central portion
The holding plate (61) is erected on the bottom plate ( 62) and one side of the support plate (6
1a) a pair of arms (63,
64), and the arm (63) on one side has the rack
The position adjustment bolt (66) is fixed, and the other arm (64) has a mounting hole (67) in the horizontal direction.
The dial gauge is inserted into this mounting hole (67).
Insert the stem (69) of (68) and insert the dial
Fix the gauge (68) and attach the Q set adapter to the support plate (61) of the dedicated base (42).
Attach the part (44) equivalent to the mounting flange of the tab part (43)
The sliding shaft (4) through the opening (60).
8) Contact point (71) of dial gauge (68) contacts
The rack position adjustment button on the rack pin equivalent part (46).
A fuel restricting position management jig for a fuel injection pump of a diesel engine, characterized in that the jig is configured to be able to abut against a bolt (66) . 2. A fuel limiting position management jig according to claim 1, wherein a fuel limiting position of a metering rack (3) of a fuel injection pump (2) housed in a pump housing case (1) is managed. A method for managing a fuel limit position of a fuel injection pump of a diesel engine, comprising: (a) attaching a fuel injection pump (2) to a dedicated base (42); A step of copying the reference rack position by a rack position adjusting bolt (66) at a position where the engraved lines (10) and (11) are made coincident with each other, and moving the {c} fuel injection pump (2) from the dedicated base (42). Removing, and attaching Q setting adapter portion (43), sets the position of Rakkupin corresponding portion (46) on the basis of the reference rack position of {d} rack position adjusting bolt (66) Then DOO
Also, the base set by the rack position adjustment bolt (66)
From the semi-rack position, set the distance by dial gauge (68).
Move the specified length while measuring to meet the engine specifications, etc.
Setting the rack to the same predetermined rack position , attaching the e-Q set adapter part (43) to the pump housing case (1) of the engine, and setting the rack pin equivalent part.
Setting a fuel limit position of the engine based on the position of (46). A method of managing a fuel limit position of a fuel injection pump of a diesel engine, comprising the steps of: 3. The adapter-side positioning means (56)
(56), which is the side of the dedicated base
The fuel limiting position management jig for a fuel injection pump of a diesel engine according to claim 1, wherein the positioning means (73) is a fitting equivalent part (73) .