JPH0427385B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention provides a method for assembling a fuel injection pump that is attached to a crankcase via an air compressor in advance in an integral manner with the air compressor. The present invention relates to a method for eliminating the need to adjust the injection timing later, and a jig used for the method.

<Prior art> On an automobile production line, each major component is pre-assembled into blocks to a certain degree, and these blocks are assembled into larger blocks or assembled into the vehicle body. . For example, the fuel injection pump for a diesel engine is often pre-assembled as a single block, consisting of a rear plate attached to the engine crankcase and an air compressor installed between the rear plate and the fuel injection pump. .

As shown in FIG. 7, which shows a conventional assembly situation of such a fuel injection pump, an air compressor, and a rear plate, first, the rear plate 102 is placed on a workbench 101, and the air compressor 103 is assembled.
The air compressor 1 is installed so that the stud bolt 105 protruding from the compressor casing 104 passes through the bolt through hole 106 of the rear plate 102.
After positioning the air compressor 103 on the rear plate 102, a nut (not shown) is screwed into the stud bolt 105 to fix the air compressor 103 to the rear plate 102. Here, fuel injection pump 1
As shown in FIG. 8, which is an enlarged view of the connection end of the air compressor 103 with respect to 07, the compressor alignment mark 110 engraved in advance on the engaging claw 109 integrated with the rotating shaft 108 of the air compressor 103 and the compressor casing 104 After setting the rotational phase of the rotating shaft 108 with respect to the compressor casing 104 so as to match the compressor alignment mark 111 engraved in advance, the driving disk 112 is engaged with the engagement claw 109.

On the other hand, the illustrated fuel injection pump 107 has a built-in timer that changes the injection timing of the fuel injection pump 107 according to the rotational speed of the crankshaft. As shown in FIG. 9, which is an enlarged view of FIG.
Pump alignment mark 115 engraved in advance on 14 and pump casing 11 which also serves as a timer casing
The rotational phase of the timer rotation shaft 113, that is, the camshaft (not shown), with respect to the pump casing 116 is set so that the pump alignment mark 117 engraved in advance on the pump casing 116 coincides with the pump alignment mark 117 engraved in advance. In this state, the stud bolt 119 protruding from the compressor casing 104 of the air compressor 103 is passed through the arc-shaped long hole 118 formed in the pump casing 116 of the fuel injection pump 107, and then the timer rotation shaft 113 is inserted into the driving disk 112. engaging claw 114
The fuel injection pump 107 is mounted on the air compressor 103 in such a way that they are engaged with each other. Thereafter, the timer rotation shaft 113 is moved relative to the air compressor 103 so that the pump/compressor alignment mark 120 engraved in advance on the pump casing 116 and the pump/compressor alignment mark 121 engraved in advance on the compressor casing 104 match. The fuel injection pump 107 is rotated around the center of the fuel injection pump 107, and a nut (not shown) is screwed into a stud bolt 119 to fix the fuel injection pump 107 to the air compressor 103.

<Problems to be solved by the invention> Fuel injection pump 107 and air compressor 10
3, conventionally, the pump/compressor alignment mark 120 engraved on the pump casing 116 and the pump/compressor alignment mark 12 engraved on the compressor casing 104 are used.
1 are made to match, but these pump/compressor alignment marks 120, 121 are not based on the rotational phase of the crankshaft;
It's just an eye candy.

For this reason, when starting the engine with a block assembled using the conventional method installed in the crankcase, approximately 40% of the blocks require readjustment of the injection timing. Loosen the nut screwed into the bolt 119 and use the arcuate long hole 118 to remove the compressor casing 10.
The rotation phase of the pump casing 116 with respect to 4 is changed, the pump casing 116 is turned so that the injection timing is correct, and the nut is screwed in again. Therefore, in order to determine whether these assembly conditions are correct, it is necessary to start the engine, and a considerable number of items must be readjusted, increasing the number of man-hours and reducing the overall assembly time. It had the disadvantage of increasing time.

In addition, if the engine specifications are different, the compressor casing 104 and the pump casing 11
If the rotational phase with 6 is not changed, the injection timing will be completely out of order.
It is necessary to stamp parallel to the pump/compressor alignment mark 121 on the pump casing 116 or the pump/compressor alignment mark 120 on the pump casing 116, and there is a risk of combining the wrong pump/compressor alignment mark.

In view of the above-mentioned various problems that occur when assembling the conventional fuel injection pump and air compressor, the present invention provides an assembly method and an assembly method in which the injection timing of the fuel injection pump can be adjusted accurately without starting the engine. It is an object of the present invention to provide a jig that can be used to speed up and simplify this assembly method.

<Means for Solving the Problems> A method for assembling a fuel injection pump and an air compressor according to the present invention includes an air compressor connected to a crankcase via a rear plate, and a preset method for the crankcase. The fuel injection pump is assembled with a pump alignment mark engraved on the timer rotation shaft and the pump casing, which allows the rotation phase of the timer rotation shaft corresponding to the rotation phase of the crankshaft to be determined with respect to the pump casing. At this time, after attaching the air compressor to the rear plate and fixing the rotating shaft of the air compressor to the compressor casing at a rotation angle corresponding to the rotational phase of the crankshaft,
When the rotation shaft of the air compressor and the timer rotation shaft are connected in this state, a pump/compressor alignment mark that should match the pump alignment mark engraved on the pump casing is placed on the rotation shaft of the air compressor. The air compressor is stamped on the compressor casing through a connectable stamping jig, and the air compressor is stamped so that the pump/compressor alignment mark stamped on the compressor casing matches the pump alignment mark on the pump casing. The invention is characterized in that the fuel injection pump is attached to the fuel injection pump.

Further, the air compressor positioning jig according to the present invention includes a workbench on which a rear plate is placed, and a rear plate having a plurality of positioning holes each of which fits into a plurality of knock pins protruding from a crankcase. a plurality of knock pins that protrude and can be respectively fitted into the positioning holes of the rear plate;
When the rotational phase of the gear alignment mark engraved on the compressor gear, which is integral with the rotational shaft of the air compressor attached to the rear plate, with respect to the compressor casing corresponds to the preset rotational phase of the crankshaft, the compressor gear is rotated. a fixing gear piece that can mesh with the compressor gear to restrain the rotation of the compressor gear and at the same time match the gear alignment mark; It is equipped with gear fixing means for freely supporting the gear.

Further, the marking jig according to the present invention includes an air compressor connected to a crankcase, and a rotational phase of a timer rotational shaft corresponding to a rotational phase of a crankshaft set in advance for the crankcase. A pump alignment mark that can be indexed against the jig body and the compressor casing is used when assembling the timer rotation shaft and the fuel injection pump stamped on the pump casing. an engaging portion that engages with an engaging claw that is integral with the rotating shaft of the air compressor that is fixed at a rotational phase corresponding to a rotational phase of the crankshaft; a marking punch that stamps a pump/compressor alignment mark on the compressor casing that matches the pump alignment mark engraved on the pump casing; a position where the pump alignment mark on the pump casing matches the pump/compressor alignment mark on the compressor casing stamped by the marking punch when the rotation shaft and the rotation axis of the air compressor are connected; It is characterized in that it is set for the jig main body.

<Operation> The rotational shaft of the air compressor is fixed by the compressor positioning jig at a rotational phase corresponding to the rotational phase of the crankshaft preset with respect to the compressor casing. On the other hand, based on the pump alignment mark engraved on the pump casing and timer rotation shaft of the fuel injection pump that corresponds to the previously set rotational phase of the crankshaft, the pump/compressor alignment that matches the pump alignment mark on the pump casing is determined. The mark is stamped on the compressor casing using a stamping jig that engages with the rotating shaft of the air compressor. Then, the pump/compressor alignment mark on the compressor casing formed by the stamping jig is overlapped with the pump alignment mark previously engraved on the pump casing so that they match. In other words, the pump/compressor alignment mark and the pump alignment mark on the compressor casing and pump casing are engraved with reference to the preset rotational phase of the crank shaft. The injection timing of the injection pump is always adjusted to be correct.

<Example> Figure 1 shows the working principle of an example in which the present invention is applied to a six-cylinder diesel engine in which the compression top dead center of the piston of the first cylinder is used as the reference mark, and the schematic shape of the crankcase is shown. As shown in FIG. 2 and FIG. 3 showing the schematic structure of the compressor positioning jig, the workbench 12 on which the rear plate 11 is placed has a plurality of positioning holes 13 formed in the rear plate 11. The rear plate 11 is fixed to the crankcase 15 with its positioning holes 13 fitted into the dowel pins 16 protruding from the crankcase 15. Ru. This rear plate 11 is formed with a bolt through hole 20 through which a stud bolt 19 protruding from the compressor casing 18 of the air compressor 17 passes. The stud bolt 1 is positioned on the rear plate 11 so as to penetrate therethrough.
It is integrated with the rear plate 11 by a nut (not shown) screwed into the rear plate 9.

As shown in FIG. 4 showing the gear train of this embodiment, the compressor gear 21, which is integrated with the rotating shaft (not shown) of the air compressor 103, is connected to the crank gear 22, which is integrated with the crankshaft (not shown), and the pair of idler gears 23, 24. The gears are set to mesh with each other through the compression top dead center of the piston of the first cylinder so that the rotational phase of the idler gears 23, 24 and compressor gear 21 can be set correctly with respect to the rotational phase of the crank gear 22. Crank gear 22 and idler gear 23 in rotational phase
The idler gear 24 and the compressor gear 21 are coaxially integrated with the idler gear 23 and the meshing contact portion with the idler gear 23.
Gear alignment marks 25 and 26 are engraved on the meshing contact portions, respectively. In other words, the gear alignment marks 25 of the crank gear 22 and idler gear 23 are aligned, and the compressor gear 21
By matching the gear alignment mark 26 with the idler gear 24, the rotation phase of the crankshaft is set so that the piston of the first cylinder is located at the compression top dead center, and the rotation axis of the air compressor 17 also corresponds to this. The rotational phase is as follows.

From such a gear train, the idler gear 24 is connected with reference to the knock pin 14 of the workbench 12.
The position of the fixing gear piece 27 on the workbench 12 corresponding to this is determined, and the fixing gear piece 27 is reciprocated in the radial direction of the rotating shaft of the air compressor 17 on the rear plate 11 via the guide rail 28. This fixing gear piece 27 is fixed to the piston rod 30 of the fluid pressure cylinder 29 installed on the workbench 12. When the number of teeth of this fixed gear piece 27 is about 1 to 3, the fixed gear piece 2 should be adjusted so that the gear alignment mark 26 of the compressor gear 21 is located in the center of the fixed gear piece 27.
The phase of the rotating shaft of the air compressor 17 can be adjusted by using the tooth 7 as a gear alignment mark, but if the fixed gear piece 27 has a large number of teeth, the gear alignment mark should be engraved on this fixed gear piece 27. It is desirable to keep it.

Therefore, by using the gear alignment mark 26 engraved on the compressor gear 21 in advance, the phase of the rotating shaft of the air compressor 17 is adjusted so that the gear alignment mark and the center of the fixed gear piece 27 are aligned. By operating the fluid pressure cylinder 29 and engaging the fixing gear piece 27 with the compressor gear 21, rotation of the rotation shaft of the air compressor 17 is restrained. Air compressor 17 at this time
Naturally, the rotational phase of the rotational shaft coincides with the rotational phase of the crankshaft corresponding to the compression top dead center of the piston of the first cylinder. In this embodiment, the fixing gear piece 27 is configured to reciprocate in the radial direction of the rotating shaft of the air compressor 17, but it may also be configured to swing around a pivot parallel to the rotating shaft.

On the other hand, a timer is incorporated in the pump casing 32 of the fuel injection pump 31 of this embodiment.
It is essentially the same as shown in FIGS. 7 and 9. Therefore, a pump alignment mark 33 corresponding to the rotational phase of the crankshaft at which the piston of the first cylinder is at compression top dead center is engraved on the timer shaft and the pump casing 32, which are integral with the camshaft (not shown). The pump/compressor alignment mark 34 corresponding to the pump alignment mark 33 engraved on the pump casing 32 is attached to a stamping jig 35 to be described later.
is engraved on the compressor casing 18.

As shown in FIG. 5a showing the front shape of this stamping jig 35, FIG. 5b showing the bottom shape thereof, and FIG. A pair of engagement portions 39 are protruded from the jig body 36 and engage with engagement claws 37 integrated with the rotating shaft of the air compressor 17 via a driving disk 38. A marking punch 40 for stamping a pump/compressor alignment mark 34 on the compressor casing 18 is provided in the section. The relative position of the engaging portion 39 and the marking punch 40 is the relative position of the locking claw (see FIG. 9) integrated with the camshaft with the pump alignment mark 33 aligned with the pump alignment mark 33 of the pump casing 32. Matches body position.

Therefore, the marking jig 35 is attached to the locking pawl 37 of the rotating shaft of the air compressor 17, which is fixed by the fixing gear piece 27, through the driving disk 28.
Engage the locking claws 39 of the marking punch 4.
A pump/compressor alignment mark 34 is stamped on the compressor casing 18 by hitting the upper end of the 0 with a hammer or the like.

Thereafter, the fuel injection pump 31 is mounted on the air compressor 17 so that the stud bolt 41 protruding from the compressor casing 18 passes through the arc-shaped elongated hole 42 formed in the pump casing 32.
After adjusting the phase of the pump casing 32 so that the pump alignment mark 33 on the pump casing 32 matches the pump/compressor alignment mark 34 on the compressor casing 18, screw a nut (not shown) onto the stud bolt 41. A fuel injection pump 31 is fixed on the air compressor 17. As a result, the compressor casing 18 and the pump casing 32 are connected based on the compression top dead center of the piston of the first cylinder, and the injection timing of the fuel injection pump 31 is set correctly, so the engine can be started. There is no need to start operation and adjust the injection timing.

In this example, the rotational phase of the crankshaft corresponding to the compression top dead center of the piston of the first cylinder was used as the reference, but the pump/compressor alignment mark may be engraved using other rotational phases as the reference. .

<Effects of the Invention> According to the present invention, a pump/compressor alignment mark is engraved on the compressor case using a stamping jig based on a preset rotational phase of the crankshaft, and the pump/compressor alignment mark is stamped on the fuel injection pump. Since the air compressor and fuel injection pump are connected so that the pump alignment marks engraved in advance match, the injection timing of the fuel injection pump is always set correctly, and the injection timing can be adjusted by starting the engine. There is no longer a need to do this. In addition, even for engines with different specifications, assembly work can be performed quickly and easily by using the compressor positioning jig and the marking jig, making it possible to significantly improve work efficiency.

[Brief explanation of drawings]

Fig. 1 is an exploded view showing the working concept of an embodiment of the method for assembling a fuel injection pump and air compressor according to the present invention, Fig. 2 is a front view of the crankcase, and Fig. 3 is the mechanism of the compressor positioning jig. Conceptual diagram, Figure 4 is a conceptual diagram of the gear train, Figure 5a
5B is a plan view of the marking jig, FIG. FIG. 9 is a plan view of the fuel injection pump, and FIG. 9 is a bottom view of the fuel injection pump. Also, in the figure, 11 is a rear plate, 12 is a workbench, 13 is a positioning hole, 14, 16 are knock pins, 15 is a crankcase, 17 is an air compressor, 18 is a compressor casing, 21 is a compressor gear, 22 is the crank gear, 23,
24 is an idler gear, 25, 26 are gear alignment marks, 27 is a fixing gear piece, 28 is a guide rail, 29 is a fluid pressure cylinder, 31 is a fuel injection pump, 32 is a pump casing, 33 is a pump alignment mark, 34 is Pump/compressor alignment mark, 35 is the marking jig, 36 is the jig body, 37,3
9 is a locking claw, 38 is a driving disc, 40
is a marking punch.

Claims (1)

[Claims] 1. Crankcase 1 via rear plate 11
an air compressor 17 connected to the air compressor 17 connected to the pump casing 32 of the pump casing 32; When assembling the fuel injection pump 31 with marks 33 engraved on the timer rotation shaft and the pump casing 32, the air compressor 17 is attached to the rear plate 11, and the rotation shaft of the air compressor 17 is connected to the compressor. After fixing the rotation angle to the casing 18 at a rotation angle corresponding to the rotation phase of the crankshaft, when the rotation shaft of the air compressor 17 and the timer rotation shaft are connected in this state, a mark is stamped on the pump casing 32. A pump/compressor alignment mark 34 that should match the pump alignment mark 33 is stamped on the compressor casing 18 via a stamping jig 35 that can be connected to the rotating shaft of the air compressor 17.
The fuel injection pump 31 is assembled to the air compressor 17 so that the pump/compressor alignment mark 34 engraved on the pump 8 matches the pump alignment mark 33 of the pump casing 32. How to assemble the fuel injection pump and air compressor. 2. A workbench 12 on which the rear plate 11 is placed, which has a plurality of positioning holes 13 each of which fits into a plurality of dowel pins 16 protruding from the crankcase 15; A plurality of knock pins 14 that can be fitted into the positioning holes 13 of the plate 11, respectively, and an air compressor 17 that is attached to the rear plate 11.
The lever meshes with the compressor gear 21 when the rotational phase of the gear alignment mark 26 engraved on the compressor gear 21, which is integral with the rotational shaft of the compressor casing 18, is at a position corresponding to the preset rotational phase of the crankshaft. A fixing gear piece 27 that can restrain the rotation of the compressor gear 21 and match the gear alignment mark 26 at the same time.
and a gear fixing means 28 provided on the workbench 12 and supporting the fixing gear piece 27 so as to be able to engage with or disengage from the compressor gear 21.
An air compressor rotating shaft positioning jig equipped with 29. 3. Indexing the air compressor 17 connected to the crankcase 15 and the rotational phase of the timer rotational shaft corresponding to the rotational phase of the crankshaft preset for the crankcase 15 with respect to the pump casing 32 thereof. Get pump alignment mark 33
is used when assembling the timer rotation shaft and the fuel injection pump 31 stamped on the pump casing 32, and the jig body 36 and the jig body 36 are
an engaging portion 39 that engages with an engaging pawl 37 that is integral with the rotational shaft of the air compressor 17 and is fixed in a rotational phase corresponding to the rotational phase of the crankshaft with respect to the compressor casing 18; ,
the pump alignment mark 33 protruding from the jig main body 36 and engraved on the pump casing 32;
Pump/compressor alignment mark 3 to match
4 on the compressor casing 18, and this marking punch 40 connects the timer rotation shaft and the rotation shaft of the air compressor 17 with a rotational phase corresponding to the rotational phase of the crankshaft. In this case, the pump alignment mark 33 of the pump casing 32
and the pump/compressor alignment mark 34 of the compressor casing 18 stamped by the marking punch 40 are set on the jig main body 36 at a position where jig.