JP2003278619A - Gear phase stipulating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily mount an auxiliary machine such as a fuel pump on an input gear so as not to generate phase deviation and to surely confirm whether or not the input gear is at a regular engaging position, regardless of skillfulness of a worker. <P>SOLUTION: This gear phase stipulating device is for the fuel pump 6 (auxiliary machine) engine-driven by torque transmitted from a crankshaft via a gear train 5. The device is provided with a check hole 11 punched on an end face of the input gear 8 of the fuel pump 6, an insertion hole 12 punched to coincide with the check hole 11 when the input gear 8 is at the regular engaging position in an adapter 9 to mount the fuel pump 6 on a timing gear case 2, and a check pin 13 formed to be completely insertable from an axial center direction of the input gear 8 in a state of the check hole 11 and the insertion hole 12 coinciding with each other. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear phase regulating device for an auxiliary machine attached to an engine.

[0002]

2. Description of the Related Art Conventionally, regarding fuel injection of an engine,
A common rail fuel injection system is known as a method for increasing the injection pressure and optimally controlling the injection conditions such as fuel injection timing and injection amount according to the operating state of the engine. This common rail fuel injection system is known. In this case, the fuel pressurized to a predetermined pressure by the fuel pump is accumulated in the common rail, and the accumulated fuel is injected at the optimum injection timing and injection amount determined by the control device according to the operating state of the engine. Under each condition, each injector injects fuel into each cylinder.

Generally, a fuel pump used in such a common rail fuel injection system is designed so that the engine is driven by the torque transmitted from a crankshaft through a gear train. An input gear attached to the tip of the input shaft of the pump forms an element of a gear train and receives torque, whereby the input shaft is rotationally driven to raise and lower an internal plunger via a cam or tappet (not shown), Fuel is compressed in the pump chamber as the plunger moves up and down, and is pressure-fed to the common rail via a delivery valve (check valve).

Here, the fuel pump makes one revolution by two revolutions of the engine, and during the one revolution, the fuel is pumped in a number corresponding to the number of cylinders of the engine. Since it is necessary to match the timing at which fuel is pumped from the fuel pump and the pressure in the common rail rises with the timing at which injection is performed in each cylinder of the engine, the phase of the input gear is conventionally the phase of the crankshaft. It is necessary to match the timing with each other.

[0005]

However, in this type of fuel pump, the input shaft has the property of rotating freely when the tappet gets over the cam lobe and descends. It is extremely difficult to attach the fuel pump to the timing gear case while maintaining the state of being aligned with the regular meshing position, and the fuel pump was attached with the input gear being out of phase, so the installation work should be redone. It was easy to have the problem of having to do it.

Further, in order to avoid the mounting of the fuel pump accompanied by the phase shift, a check window is provided to visually confirm whether the markings on the fixed side and the input gear side are aligned with each other. Means may be effective, but this kind of visual confirmation tends to involve the subjectivity of the observer, and the appearance varies depending on the viewing direction, so it seems that the observer was a beginner with insufficient skill. In that case, there is a problem that misidentification is likely to occur.

The present invention has been made in view of the above circumstances, and an auxiliary machine such as a fuel pump can be easily attached to an input gear so as not to cause a phase shift, and can be reliably performed regardless of the skill of an operator. The purpose is to make it possible to confirm whether or not the input gear is in the regular meshing position.

[0008]

SUMMARY OF THE INVENTION The present invention is a gear phase defining device for an auxiliary machine driven by a torque transmitted from a crankshaft through a gear train.
A check hole that is attached to the tip of the input shaft of the accessory and is formed in the end surface of the input gear that forms one element of the gear train, and the timing gear case that is installed with the accessory on the open side of the timing gear case that houses the gear train. The insertion hole formed so as to match the check hole when the input gear is in the regular meshing position with the adapter that closes the input gear and the insertion hole of the input gear when the check hole and the insertion hole are in mutual agreement. A check pin formed so as to be completely inserted from the axial direction.

When a new accessory is attached to the timing gear case, a check pin is inserted by aligning the insertion hole of the adapter mounted on the accessory with the check hole of the input gear. When the adapter is attached to the timing gear case with the rotation of the input gear locked, it is possible to attach the accessory to the timing gear case via the adapter without worrying about the rotation of the input shaft. By properly aligning and mounting each other, the input gear is naturally incorporated as one element of the gear train without phase shift.

After completing the mounting of the auxiliary equipment,
It suffices to remove the check pin to unlock the input gear.For removing the accessory that has already been installed from the timing gear case for maintenance, etc., use it for phase adjustment when re-installing the accessory. prepare for,
It is necessary to return the input gear to the proper meshing position and then remove it, but if you insert the check pin into the insertion hole of the adapter and check whether it can be fully inserted until the end, the check pin can be completely inserted. In addition, it is confirmed that the insertion hole and the check hole are aligned and the input gear has returned to the normal meshing position, and when the check pin can only be inserted halfway, the insertion hole and the check hole are misaligned. Therefore, it is confirmed that the input gear is out of phase.

Further, in the present invention, it is preferable that the check hole is formed in the outer peripheral portion of the input gear, and in this case, the check hole is formed in the vicinity of the gear teeth of the input gear. Therefore, the shift of the gear teeth is likely to appear as a phase shift between the check hole and the insertion hole, and it is possible to realize more accurate alignment of the input gear to the regular meshing position.

Further, the check hole may also serve as a marking for visual confirmation. By doing so, when the auxiliary equipment is newly installed, it is possible to double check the auxiliary equipment by mechanical alignment and visual confirmation. It is possible to check the gear phase.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an example of a mode for carrying out the present invention. In this embodiment, a fuel pump (complementary) driven by an engine by a torque transmitted from a crankshaft (not shown) through a gear train is shown. As shown in FIGS. 1 to 3, a gear train 5 is provided in a space 4 formed by a timing gear case 2 mounted on a rear wall of a cylinder block of an engine 1 and a flywheel housing 3 as shown in FIGS. Are to be accommodated.

An input gear 8 which is an element of the gear train 5 is attached to the tip of the input shaft 7 of the fuel pump 6, and the fuel pump 6 is attached to the end portion on the mounting side of the fuel pump 6. An adapter 9 for attaching to the timing gear case 2 is mounted, and the input gear 8 is accommodated in the space 4 through a gear hole 10 opened in the timing gear case 2 so that the adapter 9 together with the fuel pump 6 can be connected to the timing gear case 2. The gear hole 10 is closed by the adapter 9 when it is attached to the.

A check hole 11 is formed on the outer peripheral portion of the end surface of the input gear 8 of the fuel pump 6 on the side of the adapter 9 so as to be recessed in the axial direction of the input gear 8 near the gear teeth. At a proper position exposed to the outside after being mounted on the adapter 9, the input gear 8 is at a regular meshing position (the input gear 8 when the phase of the crankshaft is aligned with the top dead center of the compression stroke of the first cylinder). (Mating position)
At the time of, the insertion hole 12 is formed in the axial direction of the input gear 8 so as to coincide with the check hole 11.

That is, by inserting the check pin 13 from the axial direction of the input gear 8 when the check hole 11 and the insertion hole 12 are aligned with each other, the input gear 8 is brought into the normal meshing position phase. It can be locked.

Here, the check pin 13 can be completely inserted until the end with the check hole 11 and the insertion hole 12 aligned, and the pin head 14 can be seated on the end face of the input gear 8 without a gap. Further, when the check pin 13 is pulled out and the lock is released, an appropriate plug (not shown) can be attached to the insertion hole 12 of the adapter 9 to close it.

When the fuel pump 6 is newly attached to the timing gear case 2, the phase of the crankshaft on the engine 1 side is adjusted to the top dead center of the first cylinder, and the fuel is fed as shown in FIG. The insertion hole 12 of the adapter 9 mounted on the pump 6 and the check hole 11 of the input gear 8 are aligned with each other and the check pin 13 is inserted, whereby the rotation of the input gear 8 is locked and the adapter 9 is inserted into the timing gear case 2. When it is attached to the timing gear case 2, the fuel pump 6 can be attached to the timing gear case 2 via the adapter 9 without worrying about the rotation of the input shaft 7, and the bolt holes of the adapter 9 and the timing gear case 2 are properly aligned. If they are attached to each other, the input gear 8 is automatically incorporated as one element of the gear train 5 without any phase shift. That.

After the fuel pump 6 has been attached, the check pin 13 may be pulled out to unlock the input gear 8, and the fuel pump 6 already attached may be used for maintenance or the like. When removing from the timing gear case 2, it is necessary to return the input gear 8 to the normal meshing position and then remove it in preparation for phase alignment when reattaching the fuel pump 6, but the check pin 13 is inserted through the adapter 9. By checking whether or not the check pin 13 can be completely inserted to the end by inserting it into the hole 12, as shown in FIG. 4, when the check pin 13 can be completely inserted to the end, the insertion hole 12 and the check hole 11 are aligned. It is confirmed that the input gear 8 has returned to the normal meshing position,
As shown in FIG. 5, when the check pin 13 can be inserted only halfway, it is confirmed that the insertion hole 12 and the check hole 11 are misaligned and the input gear 8 is out of phase.

That is, when the fuel pump 6 is removed from the timing gear case 2, it can be recognized that the piston of the first cylinder has reached the top dead center by the pointer attached to the flywheel, the crank damper or the like. Since the input gear 8 of the fuel pump 6 makes one revolution by two revolutions of the engine, even if the phase of the crankshaft is adjusted to the top dead center of the first cylinder, it does not occur at the top dead center of the compression stroke. Since it is not known from the outside whether the exhaust stroke is at the top dead center or not, it is possible to surely determine whether the input gear 8 is at the regular meshing position by inserting the check pin 13 and checking.

Therefore, according to the above embodiment, the adapter 9
The input gear 8 of the fuel pump 6 can be locked in the regular meshing position by inserting the check pin 13 by aligning the insertion hole 12 of the fuel pump 6 with the check hole 11 of the input gear 8. The input gear 8 can be easily attached so as not to cause phase shift, and
Since it is possible to easily determine whether or not the input gear 8 of the fuel pump 6 is out of phase by a simple mechanical operation of inserting the check pin 13, it is possible to reliably input the input gear 8 regardless of the skill of the operator. It can be confirmed whether or not 8 is in the regular meshing position.

Further, particularly in the present embodiment, since the check hole 11 is formed near the gear teeth on the outer peripheral portion of the input gear 8, the deviation of the gear teeth causes the phase difference between the check hole 11 and the insertion hole 12. It becomes easy to appear as a shift and the input gear 8
The alignment to the regular meshing position can be achieved with higher accuracy.

In the example described above, the check hole 11 is formed by denting the end face of the input gear 8 on the adapter 9 side. However, the check hole 11 is opposite to the end face of the input gear 8 on the adapter 9 side. The check hole 11 may also be used as a marking for visual confirmation by penetrating to the end face.

In this case, the marking on the fixed side previously attached to the inner surface of the timing gear case 2 and the check hole 11 are matched with each other without any phase shift, and the gear train 5 is set. It suffices if it can be visually confirmed from a gear hole 10 or the like of another auxiliary machine (a power steering pump or the like) which is to be mounted on the opposite side of the fuel pump 6 with the space therebetween. When the fuel pump 6 is newly installed, the gear phase of the fuel pump 6 can be double confirmed by mechanical alignment and visual confirmation.

It should be noted that the gear phase regulating device of the present invention is not limited to the above-mentioned embodiment, and that the auxiliary device may be one other than the fuel pump of the common rail fuel injection system, and it is visually confirmed. Needless to say, the marking for use may be provided separately from the check hole, and other various modifications may be made within the scope not departing from the gist of the present invention.

[0027]

According to the gear phase regulating device of the present invention described above, various excellent effects as described below can be obtained.

(I) According to the first aspect of the present invention, the input gear of the auxiliary machine is made normal by inserting the check pin by aligning the insertion hole of the adapter with the check hole of the input gear. Since it can be locked in the meshing position of the auxiliary gear, the auxiliary gear can be easily attached to the input gear so that there is no phase shift, and the input gear of the auxiliary equipment can be phased by a simple mechanical operation of inserting the check pin. Since it is possible to easily determine whether or not the shift has occurred, it is possible to reliably confirm whether or not the input gear is in the regular meshing position regardless of the skill level of the operator.

(II) According to the invention described in claim 2 of the present invention, the check hole is formed in the vicinity of the gear tooth on the outer peripheral portion of the input gear, and the shift of the gear tooth is caused by the check hole. And the insertion hole are likely to appear as a phase shift, and the alignment of the input gear to the regular meshing position can be realized with higher accuracy.

(III) According to the invention described in claim 3 of the present invention, when the accessory is newly installed, the gear phase of the accessory is double confirmed by mechanical alignment and visual confirmation. You can

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an embodiment for carrying out the present invention.

FIG. 2 is an external view showing a mounted state of the fuel pump of FIG.

3 is a partially cutaway perspective view showing details of a check hole and an insertion hole of FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing an enlarged main part of FIG.

5 is a cross-sectional view showing a state in which the check pin of FIG. 4 is not completely inserted.

[Explanation of symbols]

1 engine 2 timing gear case 5 gear train 6 Fuel pump (auxiliary equipment) 7 Input axis 8 input gears 9 Adapter 11 check holes 12 insertion holes 13 check pins

Claims (3)

[Claims] 1. A gear phase regulating device for an auxiliary machine driven by a torque transmitted from a crankshaft via a gear train, the input being a component of a gear train when mounted on a tip of an input shaft of the auxiliary machine. A check hole formed on the end face of the gear, and the check hole when the input gear is in a normal meshing position with an adapter that is attached to the open side of the timing gear case that houses the gear train together with an auxiliary device to close the timing gear case. And a check pin formed so as to be completely inserted from the axial direction of the input gear when the check hole and the insertion hole are in a mutually matched state. A gear phase regulating device characterized in that 2. The gear phase regulating device according to claim 1, wherein a check hole is formed in an outer peripheral portion of the input gear. 3. The gear phase regulating device according to claim 1, wherein the check hole also serves as a marking for visual confirmation.