JPH027259Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a structure for supplying lubricating oil to the inside of a pump case housing a fuel pump (fuel injection pump) in an internal combustion engine such as a diesel engine.

(Prior art) As this type of oil supply structure, for example,
No. 30491 discloses a structure in which oil is stored in the fuel pump case in advance. Moreover, the structure of Japanese Utility Model Application Publication No. 133906/1983 discloses a structure in which oil stored in a crank chamber is splashed up by a crankshaft and supplied to a fuel pump chamber.

(Problem that the invention aims to solve) However, in the former case, that is, a structure in which oil is stored in the pump case in advance, it is necessary to fill the pump case with oil from a special filler port before starting the engine, which requires a lot of work. The problem is that it is time-consuming and troublesome. Also, each time the oil deteriorates, it needs to be replaced, which is a time-consuming process. Moreover, there is a problem in that various parts are contaminated by deteriorated oil inside the pump case during disassembly. Furthermore, when reassembling the device after disassembly, it is necessary to re-lubricate the device, which is time-consuming and there is a risk of forgetting to supply oil.

On the other hand, in the latter structure, in which oil is scattered from inside the crankcase into the inside of the pump case, the distance from the inside of the crankcase to the pump case is long, making it difficult to supply a sufficient amount of oil, especially during high-speed operation. There is a high risk that there will be a shortage. Furthermore, since the oil in the crankcase is often contaminated with foreign matter, there is also a risk that the lubrication of the fuel pump may be insufficient.

The present invention attempts to solve the above problems.

(Means for Solving the Problems) In order to solve the above problems, the present invention accommodates the crankshaft gear, the intermediate gear for driving the auxiliary equipment, and the auxiliary equipment driving gear in the main body of the gear case, and houses the fuel pump. A fuel pump case is provided adjacent to the gear case body, an oil passage is provided in the shaft of the intermediate gear that communicates with the oil gear inside the cylinder block, and the intermediate gear communicates with the oil passage to inject oil toward the pump case side. The pump is characterized in that the gear case is provided with a window for allowing the jetted oil to flow into the inside of the pump case.

(Function) According to the above structure, during engine operation, oil is reliably supplied to the inside of the fuel pump case from the oil gear inside the cylinder block through the oil jet of the intermediate gear. Moreover, since this oil is supplied to the oil gear gallery through an oil strainer, oil that does not contain foreign substances (oil with high lubricating performance) is supplied into the pump case.

(Example) Figure 1 is a schematic front view of the engine with the gear case cover removed, which will be described later. Figure 2 is a schematic cross-sectional view of Figure 1. Figure 3 is a schematic cross-sectional view of Figure 1. FIG. 2 is an enlarged partial view of the - cross section of FIG. 1;

In FIG. 1, a lubricating oil pump drive gear 3 meshes with a crankshaft gear 2 attached to an end of a crankshaft 1 from diagonally below, and an intermediate gear 5 meshes from diagonally above. A fuel pump drive gear 6 and a camshaft gear 7 are connected to the intermediate gear 5 from both sides and diagonally above.
A hydraulic pump drive gear 8 is engaged with the camshaft gear 7 diagonally from below and on the opposite side to the intermediate gear 5. The fuel pump drive gear 6 is attached to the end of the pump camshaft 10.
A fuel pump 11 driven by the engine 0 is located above the pump camshaft 10.

The entire gear mechanism is housed in a gear case 15. As shown in FIG. 2, the gear case 15 is fixed to an end wall (a wall approximately perpendicular to the crankshaft 1) of a cylinder block 16 by a plurality of bolts 14 (only one is shown). The gear case 15 itself has an open shape on the side opposite to the cylinder block 16 (on the left side in FIG. 2), and by fixing the gear case lid 17 to the open end, the internal space 18 that accommodates each of the gears is opened. It is sealed.

A cylindrical boss 20 on the inner circumference of the intermediate gear 5 is supported by an idle shaft 22 via a bearing metal 21. One end of the idle shaft 22 fits into a hole in the cylinder block 16, and a flange 23 provided near the end is fixed to the cylinder block 16 with bolts 24. idle shaft 2
An oil passage 25 is provided in the center of 2. One end of the oil passage 25 is closed by a bolt 26, and the other end communicates with an oil gear gallery 27 inside the cylinder block 16. oil gear 2
Oil filtered by an oil strainer (not shown) is supplied to 7 by a lubricating oil pump (not shown).

The idle shaft 22 is provided with oil passages 29 and 30 extending from the oil passage 25 to the outer periphery, and the oil supplied to the oil passage 25 is passed through the passage 2.
The oil reaches the inner periphery of the bearing metal 21 via oil 9 and 30, and the sliding surfaces of the bearing metal 21 and the shaft 22 are lubricated by this oil. A radial oil passage 31 is also provided at one location in the bearing metal 21. A jet 32 (injection port) that communicates with an oil passage 31 and opens on the outer periphery is formed in the boss 20 as a perforated hole. Since the bearing metal 21 is designed to rotate together with the intermediate gear 5,
Passage 31 and jet 32 are always in communication. Further, the position of the oil passage 31 in the axial direction (left and right direction in FIG. 2) is aligned with the oil passage 30. Therefore, when the intermediate gear 5 rotates, the oil passage 30 and the oil passage 31 temporarily communicate with each other every rotation, and at the time of communication, the oil in the oil passage 25 flows through the passages 30, 31.
from the jet 32 into the interior space 18 through. Further, the directions of the passage 30 and the jet 32 are set so that the jetted oil is directed toward the fuel pump 11 as indicated by arrow R in FIG.

As shown in FIG. 3, a fuel pump case 35 is integrally provided with the gear case 15. pump case 3
5 projects from the main body of the gear case 15 (the part surrounding the gear mechanism) to the side of the side surface 36 of the cylinder block 16, and a gap L is provided between the pump case 35 and the side surface 36 of the cylinder block. A holder 40 and a boss 41 are provided at both ends of the pump case 35.
The pump camshaft 10 is supported by bearings 38 and 39. The pump shaft gear 6 is fixed to the end of the pump camshaft 10 protruding from one bearing 38. Fuel pump 11 as shown in Figure 4
is fixed in a state where it is fitted into the upper end opening of the pump case 35, and the plunger 42 protruding from the lower end of the fuel pump 11 is connected to the cam 43 of the pump camshaft 10.
It is designed to be driven by The other end of the pump camshaft 10 projects from the bearing 39, and a governor (not shown) is connected to the projecting end.

Above the holder 40, the gear case 1
5 is provided with a window 45, through which the internal space 18 of the gear case 15 body and the pump case 3 can be seen.
The internal spaces 46 of No. 5 are in communication. This window 45 is for allowing the jetted oil to flow into the internal space 46 . The oil jetted upward as indicated by arrow R collides with the upper inner surface of the gear case lid 17 and bounces off, passing through the window 45 and flowing into the internal space 46 . There is an influx.

The holder 40 is an annular component that is fixed to the pump case 35 with bolts 47 and holds a bearing 38 by its inner periphery. As shown in FIG. 5, which is an enlarged partial view of FIG. 4 in the direction of arrow -, oil return holes 48 are formed by casting holes on both sides of the holder 40. The return hole 48 is for returning excess oil that has flowed into the pump case 35 shown in FIG. The oil is now accumulating up to 1.

According to the above device, oil filtered by an oil strainer is intermittently jetted out from the jet 32 through the oil gear gallery 27 and oil passages 25, 30, and 31 shown in FIG. 2, and flows through the window 45 shown in FIG. 5 into the pump case. 35, and this oil causes the plunger 42 to
and the cam 43 are lubricated. Further, as oil flows into the pump case 35, excess oil is discharged from the return hole 48 into the internal space 18. In this way, the same oil does not remain in the pump case 35 for a long time, and the plunger 42 and cam 43 are always lubricated by the oil that has just been filtered.

In the embodiment described above, it was shown that the oil spouted from the jet 32 collided with the gear case lid 17 and was caused to flow in from the window 45, but as shown by the two-dot chain line in FIG. Jet 5
0 may be placed facing the window 45, and the oil r from the jet 50 may directly flow into the window 45. Also, both jets 32, 50 may be used.

(Effect of the invention) As explained above, according to the invention, the filtered oil supplied from the oil gear gallery 27 is supplied into the pump case 35 from the jet 32 or 50 of the intermediate gear 5, or from both jets 32 and 50. Therefore, the plunger 42 and the cam 43 can be effectively lubricated. Furthermore, the conventional manual oil replenishment and oil replacement work is no longer necessary, simplifying maintenance. Moreover, since degraded oil does not accumulate inside the pump case 35, there is no problem of contamination of various parts with degraded oil during disassembly. Of course, the problem of forgetting to refuel after reassembly does not occur.

[Brief explanation of the drawing]

Figure 1 is a schematic front view of the engine with the gear case lid removed, Figure 2 is a schematic cross-sectional view of Figure 1, Figure 3 is a schematic cross-section of Figure 1, and Figure 4 is a cross-section of Figure 1. Enlarged partial view, Figure 5 is 4th
FIG. 2 is an enlarged partial view in the direction of the - arrow in the figure. 2...Crankshaft gear, 5...Auxiliary drive intermediate gear, 11...Fuel pump, 15...Gear case, 16...Cylinder block, 22...Idle shaft, 25...Oil passage, 27...Oil gear gallery , 32, 50...Oil jet, 3
5...Fuel pump case, 45...Window.

Claims (1)

[Scope of utility model registration request] The crankshaft gear, the intermediate gear for driving the auxiliary gear, and the auxiliary drive gear are housed in the main body of the gear case, and a fuel pump case for accommodating the fuel pump is provided adjacent to the gear case body. An oil passage communicating with the oil gear is provided, an oil jet communicating with the oil passage and capable of injecting oil toward the pump case is provided in the intermediate gear, and a window is provided in the gear case for allowing the jetted oil to flow into the inside of the pump case. The fuel pump chamber refueling structure is characterized by: