JPH04183969A - Dual stage type in-cylinder direct fuel injection pump - Google Patents

Abstract

PURPOSE:To facilitate fuel injection, and to enable thinned-out control with a simple constitution by providing a plurality of in-cylinder direct fuel injection pumps, and also by providing a clutch mechanism to the input shaft of the in-cylinder direct fuel injection pumps each of which corresponds to respective stages. CONSTITUTION:A two-stage type in-cylinder direct fuel injection pump 44 is provided to a two-cycle diesel engine 43, and also two injection nozzles 5 to 12 per cylinder are provided. In the two-stage type in-cylinder direct fuel injection pump 44, a primary in-cylinder direct fuel injection pump 21 and a secondary in-cylinder direct fuel injection pump 19 are provided in series, and the pump 19 is connected via engaging clutches 15, 16 to a turning shaft being integral with a fuel injection pump gear 14. On the other hand, the pump 19 is directly connected to the fuel injection pump gear 14. The connection and disconnection of the engaging clutches 15, 16 is carried out manually by the operation of a lever inside a driver's cab, or automatically by an electromagnetic means.

Description

[Detailed description of the invention] [Industrial application field] Mo11 Regarding the

[Conventional technology]

Some conventional in-cylinder direct fuel injection pumps use electromagnetic valves to control fuel injection.

[Problem to be solved by the invention]

If controlled with a solenoid valve, it could be controlled freely using a computer, etc., but on the other hand, it was difficult to control fuel, which has a pressure of several hundred atmospheres per square centimeter, with a solenoid valve.

It is an object of the present invention to provide a multi-stage in-cylinder direct fuel injection pump that can perform thinning control of fuel injection.

[Failure to solve the problem]

A clutch mechanism is provided on the input shaft of a plurality of cylinder direct fuel injection pumps and the cylinder direct Pf-4 injection pump corresponding to each stage.

Inside one in-cylinder direct fuel injection pump body, plungers are provided for the product of the number of cylinders and the number of stages of the internal combustion engine, and a clutch rear part is provided on the camshaft that drives the plungers corresponding to each stage.

A dog clutch is provided as the clutch mechanism.

The interlocking portion of the dog clutch is composed of one claw and one hole.

[Effect]

Depending on whether the clutch mechanism is on or off, the in-cylinder direct fuel injection pump corresponding to each stage will be on and off.

As the clutch mechanism engages and engages, the plunger corresponding to each stage, together with the camshaft, engages and engages its operation.

The dog clutch positions the phase angle between the in-cylinder direct fuel injection pumps corresponding to each stage.

The dog clutch positions the phase angle between the plungers that drive the plungers corresponding to each stage.

A one-claw, one-hole dog clutch has only one position to engage, which prevents the wrong phase angle from being connected.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the multi-stage in-cylinder direct fuel injection pump of the present invention includes two-stage in-cylinder direct fuel injection pump 4.
4, it is provided in the two-cycle tasel engine 43.

It is a 2-stage engine with two injection nozzles in each cylinder.

The configuration of the two-stage in-cylinder direct fuel injection pump 44 includes a primary side in-cylinder direct combustion f-+ injection pump 21 and a secondary side in-cylinder direct fuel injection pump 19 arranged in series.
A dog clutch 15, 16 is provided as a clutch mechanism.

An in-cylinder direct fuel injection pop gear 14 having twice the number of crankshaft gears (not shown) is driven by the crankshaft gear (not shown) via an eye gear (not shown). ing.

The in-cylinder direct fuel injection pump gear 14VC is the primary
A side cylinder direct fuel injection pump drive shaft 23 is integrally attached.

The secondary in-cylinder direct fuel injection pump 19 is provided with a spline shaft at one end of the secondary automatic timer 17, on which the male side 16 of the dog clutch slides directly.

The female side 15 of the dog clutch is a primary (ll
It is provided integrally with the direct fuel injection pump drive shaft 23.

The claw on the male side 16 of the dog clutch is a negative claw as shown in FIG. 21, and the female side 15 of the dog clutch is a hole as shown in FIG. 20, and may be a through hole. As another embodiment, the male side 1 of the dog clutch
As shown in Fig. 4, pawls No. 6 are two pawls, and the distances from the center of the shaft are set asymmetrically so that the female side 1 of the dog clutch is
As shown in FIG. 2, 5 may be provided with a hole so that a claw on the male side 16 of the dog clutch fits therein.

In addition, the holes and pawls of the engaging clutches 15 and 16 are
As shown in FIG. 3, the individual shapes may be different when viewed from the center of the rotary shaft.

Circles and squares are even better.

Also, the holes and pawls of the dog clutches 15 and 16 are the 14th
As shown in the figure, they may be provided with different sizes.

Although not shown, a slope may be provided in the hole on the female side 15 of the dog clutch so that the claw on the male side 16 of the dog clutch can be easily disengaged.

Since the phase angle between the primary side in-cylinder direct fuel injection pump 21 and the secondary side in-cylinder direct fuel injection pop 19 is two stages, the rotation angle of the in-cylinder direct fuel injection pump gear 14 is as shown in FIG. is 180 degrees, and the phase angle (-j: is obtained by fitting the male side 16 of the mating clutch and the spline H11.

Further, the injection nozzle 33 can be reduced to one per cylinder by providing the fuel check valve means 24 in the same number of stages as shown in FIG.

As shown in FIG.
6 to make it a one-way street.

Also, instead of the check valve/I/25, a tapered check valve body 51 as shown in FIG. 17 may be used.

Each in-cylinder direct fuel injection pump may be provided with several injection pipes 13 in one injection nozzle to prevent backflow of fuel (c) without using the diagonal stop valve means 24.

Primary - side cylinder direct fuel injection pump 21 Illustration 1 - η main hunt roll rank and secondary ha Ru.

In addition, the two-stage in-cylinder direct fuel injection bomb 4 shown in FIG.
As shown in FIG. 15, the relative positions of the primary side in-cylinder direct fuel injection pump 21 and the secondary side in-cylinder direct fuel injection pump 19 are swapped, and the automatic timer is changed to only the primary side automatic timer 20. Can be made into a stage type in-cylinder direct fuel injection pump.

Furthermore, a shift fork groove 46 is provided on the male side 45 of the dog clutch.

As shown in FIG. 12, the lever 42 in the driver's cab 47
The driver can arbitrarily select the male side of the dog clutch 16 or 45.
dog clutches 15 and 16 by sliding them in their axial direction.
Or 15 and 45 can be intermittent.

Alternatively, as shown in FIG. 16, a shift fork 49 can be provided at one end of the lever 42 and fitted into a shift fork groove 46 on the male side 45 of the dog clutch.

The male side 16 or 45 of the dog clutch can also be slid by a solenoid valve or an electromagnetic force.

Also, the male side 16 or 45 of the dog clutch can be slid by swapping the relative position with the female side 15 of the dog clutch and providing a spline 52 and a smooth groove on the female side 15 of the dog clutch. can.

In this case, the female side 15 of the engaging joint or notch can be slid by a solenoid valve or an electromagnetic force.

Splines can also be made into loose-fitting serrations.

The male sides 16 and 45 of the clutch or the female side 15 of the dog clutch are alone, and when they are rotating, the rotational balance is poor, so it is also recommended to provide a balance hole to improve the rotational balance. However, it is also possible to provide a balance weight.

In addition, the two-stage internal direct fuel injection pump 44 shown in FIG. 1 has plungers ( (not shown), and the male side 16 and female side 15 of the dog clutch are provided on the primary side force shaft 53 and the secondary side force shaft 54, respectively.
A stage type in-cylinder direct combustion injection pump 44 can also be used.

The automatic timer only requires one automatic timer 20 on the primary side, and the control rack connecting rod 22 is cumbersome.

Although not shown, the governor is provided on the end face of the dog clutch.

Additionally, as shown in FIG. 8, a three-stage in-cylinder direct fuel injection pump 48 can also be provided.

In this case, the injection nozzle is shown in FIG. 9, and the fuel check valve means 24 are provided in the number of stages, and one injection nozzle is provided in each cylinder.

The configuration of the three-stage in-cylinder direct fuel injection pump 48 is as shown in FIG. 8; fuel is directly injected into one cylinder.

As shown in FIG. 8, the in-cylinder direct fuel injection pump gear 36
has three times as many teeth as the crankshaft gear 29, and is driven by one through an idler gear 30.

As shown in Fig. 10, the cylinder direct fuel injection pump 3
4u,:;3 A spline shaft is provided at one end of the automatic timer 35, and the male side 16 of the dog clutch directly slides on the spline shaft.

The in-cylinder direct fuel injection pump gear 36 is integral with the female side 15 of the dog clutch.

Although not shown, an automatic timer for reverse rotation may be used for the in-cylinder direct fuel injection pump that rotates in reverse.

The #1 in-cylinder direct fuel injection pump 31 and the #2 in-cylinder direct fuel injection pump 32 are provided with dog clutches similar to the #3 in-cylinder direct fuel injection pump 34.

1.7 Since each in-cylinder direct fuel injection pump has three stages, the rotation angle of the in-cylinder direct fuel injection pump gear 36 is 120 degrees, as shown in FIG.

Furthermore, if each in-cylinder direct fuel injection pump gear 36 is directly engaged with the idler gear 30 as shown in FIG. 18, there will be no pump that rotates in the opposite direction. .

A cover may be provided on the dog clutch to prevent mud and the like from adhering to it.

Also, it would be even better if it could be operated in oil.

For example, if the multi-stage tube (II) of series type and parallel type is used, the claws can be replaced with bolts so that the claw depth can be replaced if the distribution type tubes are also multi-staged. It can be fixed, but it can also be soldered.

The clutch mechanism may be configured to return the control rack slightly when a clutch having a positioning mechanism for disengaging and disengaging positions is engaged.

If the holes on the female side 15 of the dog clutch are made slightly larger than the claws on the male side 16 of the dog clutch, they will fit together smoothly.

A computer may be used to automatically engage and engage the clutch mechanism.

A thrust bearing may be used on the contact surface of the shift fork 49 in the shift fork groove 46 (J2
) [Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below.

If the multi-stage in-cylinder direct fuel injection pump according to claim 1 is installed in a two-stroke day cell engine with a slightly modified injection nozzle, it can be used in a normal two-cycle day cell engine by disengaging and disengaging the clutch mechanism.
/Combustion cycle operation and fuel mj subtraction 2-cycle combustion cycle operation can be freely selected.

Also, there is no need to control high-pressure fuel using a solenoid valve.

In the multi-stage in-cylinder direct fuel injection pump according to claim 2,
In addition to the above-mentioned effects, only one in-cylinder direct fuel injection pump body is required, and only one automatic timer and governor are required.

There is no need for a control rank connecting rod.

As described above, the number of parts can be reduced.

With the dog clutch according to claim 3, phase angle positioning can be easily determined by slightly modifying the claws and holes.

If the dog clutch according to claim 4 is provided, the phase angle can be positioned using one pawl and one hole, so it can be used as is.

[Brief explanation of drawings]

Fig. 1 is a simplified partial cross-sectional view of a two-stage in-cylinder direct fuel injection pump according to the present invention (++7 inch) and a simplified side sectional view of a two-stroke diesel engine; Fig. 2 is a side view of the female side of the dog clutch; Figure 3 is a side view of the male side of the dog clutch in Figure 4. Figure 4 is a front view of the male side of the dog clutch. Figure 5 is a schematic front view of the injection nozzle. Figure 6 is an enlarged view of the fuel check valve means. 7 is a cross-sectional view showing the displacement of the piston in FIG. 2 and the operation of each pump. FIG. 8 is a schematic front view of the three-stage in-cylinder direct fuel injection pump according to the present invention. A schematic front view of the injection nozzle related to the pump shown in Fig. 8. Fig. 10 is a simplified partial side sectional view of the three-cylinder direct fuel injection pump of the pump shown in Fig. 8. Fig. 11 is a schematic front view of the injection nozzle of the pump shown in Fig. 8. Figure 12 is a simplified side sectional view of the vehicle main body; Figure 13 is a front view of the female side of the dog clutch; Figure 14 is a front view of the female side of the dog clutch; Figure 15 is a front view of the female side of the dog clutch. Schematic front view of a two-stage direct fuel injection pump. Fig. 16 is a front view of the Sifton oak portion of the lever. 17. The stomach is an enlarged front view of the tapered check valve body. Fig. 18 is a gear drive of the direct fuel injection pump. 19 is a simplified partial side sectional view of the two-stage in-cylinder direct fuel injection pump according to the present invention. FIG. 20 is a front view of the female side of the dog clutch. 1 is a front view of the male side of the dog clutch. Front view 1, #1 cylinder, 2... #2 cylinder, 3 = 37 rings, 4
・=47 ring, 5 ・・Primary side injection nozzle, 6 ・・Primary ~ (J5) side injection nozzle, 7 ・・Primary side injection nozzle),
8...Primary side injection nozzle, 9...Secondary side injection nozzle, 10...Secondary side injection nozzle, 11...Secondary side injection nozzle, 12.
...Secondary side injection nozzle, 13...Injection pipe, 14 -In-cylinder direct fuel injection pump gear, 15...Female side of dog clutch, 16...Male side of dog clutch, 17...Secondary- side automatic timer, 18 direct fuel injection pumps, 2
0...Primary side automatic timer, 21
...Primary side cylinder direct fuel injection pump, 22
...Control rack connecting rod, 23...Primary side cylinder direct fuel injection pump drive shaft,
24...Fuel check valve means, 25...Check ball, 2゛6...Spring, 27...Crankshaft rotation angle 1 scale 360 degrees, 28...In-cylinder direct fuel injection pump gear rotation angle 1 Scale 180 degrees, 29...Crankshaft gear,
30... Idler gear, 31... Go 1 direct in-cylinder fuel injection pump, 32... #2 direct in-cylinder fuel injection pump, 33... Injection nozzle, 34... 73 direct in-cylinder fuel injection pump Fuel injection pump, 35...#3 automatic timer, 36...In-cylinder direct fuel injection pump gear, 37.
...Camshaft, 38...Crankshaft rotation angle 1
Scale 360 degrees, 39... In-cylinder direct twist f-, l injection pump gear rotation angle 1 scale 120 degrees, 40... Phase of well 1 in-cylinder direct fuel injection pump and #2 in-cylinder direct fuel injection pump Angle 120 degrees, 41... Phase angle of #2 in-cylinder direct fuel injection pump and #3 in-cylinder direct fuel injection pump 120 degrees,
42... Lever, 43... 2-stroke diesel engine, 44... 2-stage in-cylinder direct fuel injection pump, 45... Male side of dog clutch, 46.
...Shift fork groove, 47...Driver's cab, 48...
・3-stage direct fuel injection pump, 49...
Shift fork, 50...Fuel flow path, 51...Tapered check valve body, 52...Spline, 53
...Primary side camshaft, 54...Secondary side camshaft. Kenji Yoshida 12 Uribiki 3) i1 bias

Claims (1)

[Scope of Claims] 1. A multi-stage in-cylinder direct fuel injection pump including a plurality of in-cylinder direct fuel injection pumps and a clutch mechanism provided on the input shaft of the in-cylinder direct fuel injection pump corresponding to each stage. 2. A multi-cylinder direct fuel injection pump in which as many plungers as the product of the number of cylinders and the number of stages of the internal combustion engine are installed in the main body of the in-cylinder direct fuel injection pump, and a clutch mechanism is installed on the camshaft that drives the plunger corresponding to each stage. Stage type in-cylinder direct fuel injection pump. 3. The multi-stage in-cylinder direct fuel injection pump according to claim 1 or 2, wherein the clutch mechanism is a dog clutch. 4. The multi-stage in-cylinder direct fuel injection pump according to claim 3, wherein the engaging portion of the dog clutch has one claw and one hole.