JPH04121406A - Cylinder block of internal combustion engine - Google Patents

Abstract

PURPOSE:To enable meshing work of a gear for driving a pump while watching the gear eyes from an opening part so as to simplify construction work by providing a lublicating oil pump on a cylinder block wall which is opposite to a side cap serving as the power taking-out side of a working machine. CONSTITUTION:In a cylinder block 21, one way of a crank shaft 26 direction is opened, and the opening part 27 thereof is covered with a side cap 28. One end of the crank shaft 26 is inserted into the side cap 28, and other end is inserted into the cylinder block wall 29 of the opposite side thereof, and also both ends are supported by plain bearings 30, 31. A flywheel 33 which is provided ingegratedly with a cooling fan 32 is installed on the end of the crank shaft 26 which is projected from the cylinder block wall 29. In this case, a lublicating oil pump case 38 is formed integratedly opposite to the crank shaft 26 located between a cam shaft inserting hole 37 which is formed on the cylinder block wall 29 opposite to the opening part 27 and a balancer shaft inserting hole 36. A lublicating oil pump whose figure is not shown in a pump 38 is mounted thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cylinder block for an internal combustion engine, and particularly to a cylinder block in which an opening on one side in the direction of the crankshaft is covered with a side cover.

BACKGROUND OF THE INVENTION As mentioned above, in an internal combustion engine that has an opening on one side in the direction of the crankshaft and covers this opening with a side cover, one bearing of the crankshaft is installed on the side cover. .

Furthermore, since the lubricating oil pump is driven from the crankshaft via the camshaft, the drive shaft is parallel to the crankshaft and is attached to the side cover on the side of the gear mechanism that drives the camshaft and the like. Furthermore, the power for driving the working machine is taken out from this side cover side, and a flywheel is attached to the outside of the cylinder block on the opposite side. FIGS. 5 and 6 show the structure of a cylinder block in an internal combustion engine having such a conventional side cover structure.

In the figure, 1 is a cylinder block, and 2 is a side cover that covers the opening of this cylinder block, and one end of which is placed through a plain bearing 3 at approximately the center in the direction perpendicular to the axis when viewed from the plane of the cylinder block 1. The other end is supported by the side cover 2, and the other end is supported by a ball bearing 4 on the wall of the cylinder block 1 on the opposite side from the side cover 2.
A crankshaft 5 supported by is attached. A camshaft 6 is placed on one side of the crankshaft 5, and a balancer shaft 7 called an intermediate shaft is placed on the other side. Thus, the camshaft 6 is driven from the crankshaft 5. Further, the balancer shaft 7 is driven via a gear 9 attached to the crankshaft 1 and the balancer shaft 7 on the side opposite to the side cover 2. A lubricating oil pump 11 is housed in a case 10 formed on the side cover 2 corresponding to the lower side of the camshaft 6. A driving shaft 12 of this lubricating oil pump 11 protrudes inside the cylinder block 1, and The driven gear 13 attached to the shaft 12 is connected to the gear 8 on the camshaft 6.
The lubricating oil pump 11 is driven by the camshaft 6. Furthermore, a speed regulating flyweight mechanism 14 is attached to the tip of the drive shaft 12. The end 15 of the crankshaft 5 that protrudes from the side cover 2 is the power extraction side, and a flange 16 for direct connection to a working machine is attached to the outside of the side cover 2 on the power extraction side.

A flywheel (not shown) is arranged at the end of the crankshaft 5 on the opposite side from the flange 16.

Problems to be Solved by the Invention In the conventional structure described above, the lubricating oil pump 11 is installed on the side cover 2 which is the power extraction side, and the driven gear of the drive shaft 12 that protrudes inward from the side cover 2 from the side cover 2. 1
3 is engaged with the gear 8 on the camshaft 6, but first
Another disadvantage of this structure is that the work of assembling the side cover 2 becomes extremely troublesome. FIG. 7 shows how the lubricating oil pump 11 works in this case, with the drive shaft 12 and the parts on the drive shaft 12 attached, and the lubricating oil pump 11 covering the opening of the cylinder block 1. Although it is installed,
At this time, it is necessary to mesh the driven gear 13 on the drive shaft 12 and the gear 8 on the camshaft 6, and at that time, the gear teeth must be inserted inward in a state where they can completely mesh with each other. This is rare, so before bringing the side cover 2 into contact with the wall surface of the cylinder block 1, it is necessary to insert your hand through the gap 17 between the two and rotate at least one gear so that it is engaged. The work required a considerable amount of effort.

Secondly, the lubricating oil pump 11 is attached to the side cover 2 which is the power extraction side of the working machine, and for this reason, a flange 16 for directly connecting some working machines is provided on the outside of this side cover 2. This interferes in the axial direction with the lubricating oil pump lid 18 which is also fixed to the outer surface of the side lid 2, making it impossible to remove the lubricating oil pump 11 during maintenance. We had to give up on direct connection of the work equipment.

In this case, it may be possible to change the position of the flange 16 to avoid such interference, but the mounting dimensions of the work equipment and the flange and the direct connection structure such as the spigot are predetermined in the standard, so such changes are not allowed. Have difficulty.

Furthermore, the lubricating oil discharged from the lubricating oil pump 11 is guided to the bearing part of the crankshaft 5 through a passage formed in the wall of the cylinder block 1 or the side cover 2, and the lubricating oil that has lubricated this bearing part is transferred to the crankshaft 5. Generally, lubricating oil is supplied to the crank pin through a drilled hole in the shaft 5, but in order to flow lubricating oil to the drilled hole in the crankshaft 5 in this way, the bearing must be a plain bearing. Conventionally, since the plain bearing 3 is used only for the bearing of the side cover, it is necessary to form a passage from the lubricating oil pump 11 to the bearing in the side cover 2.
As shown in FIG.
Since the passage is located diagonally below the crankshaft 5 and below the camshaft 6, the passage must be machined diagonally, which makes machining difficult and complicates the direction of mold removal even when forming by die-casting etc. This has the disadvantage of high cost. Moreover,
Such a passage is provided by forming ribs on the inner wall of the side cover 2, but since the internal volume of the cylinder block 1 decreases due to the inward protrusion of such ribs, the cylinder block on the opposite side from the side cover 2 There was an inconvenience that ribs could not be provided on one wall, and even if the side cover was reinforced, the important cylinder block 1 could not be reinforced.

In addition, the driven gear 13 of the pump drive shaft 12 is engaged with the camshaft gear 8 on the side cover 2 side, but the camshaft gear 8 rotates at 1/2 the rotation speed of the crankshaft 5. , the camshaft gear has a larger diameter, and the position of the driven gear 13 is further away from the crankshaft.
The drawback was that the most efficient pump arrangement could not be adopted due to restrictions on the installation location of the pump.

Finally, in the past, the lubricating oil filter provided in front of the lubricating oil pump 11 was similarly provided on the side cover 2 side, and was structured to be attached and removed from the work machine side. There was an inconvenience that it was difficult to attach and detach during maintenance. In addition, since it is difficult to form the case to support the lubricating oil filter integrally with the side cover, it must be formed separately, or it may be inserted near the side cover from a direction parallel to the side cover. In the former case, the number of parts increases; in the latter case, the passage that leads lubricating oil to the bearing of the side cover 2 is connected to the side cover 2 and the cylinder. Since it breaks at the joint with the block 1, it is necessary to apply a special seal to this part, which also has the disadvantage of increasing the number of parts.

The present invention aims to eliminate the above-mentioned conventional drawbacks.

Means for Solving the Problems In order to solve the above problems, in the first invention of this application, the cylinder block opening on the side opposite to the flywheel in the crankshaft direction is covered with a side cover, and the side cover side is covered with a side cover. is the power extraction side, and one of the crankshafts is similarly supported by a bearing on the side cover, and is characterized by a lubricating oil pump installed on the cylinder block wall on the flywheel side.

Similarly, a second invention is characterized in that, in the first invention, among the bearings that support the crankshaft, the bearing supported by at least the cylinder block wall on the flywheel side is a plain bearing.

Similarly, the third invention of this application is an internal combustion engine equipped with a gear mechanism for driving a camshaft, an intermediate shaft, etc. in one cylinder block in the direction of the crankshaft, and a cylinder block on the opposite side in the direction of the crankshaft. A gear for driving a lubricating oil pump is installed in the cylinder block so as to be moved by the intermediate shaft.

Furthermore, in a fourth invention of this application, in an internal combustion engine in which a cylinder block opening on the side opposite to the flywheel in the crankshaft direction is covered with a side cover, the lubricating oil filter case is placed in the cylinder block on the side opposite to the side cover. It is characterized by being formed integrally with the cylinder block on the wall.

The fifth invention of this application is an internal combustion engine in which a cylinder block opening on the side opposite to the flywheel in the crankshaft direction is covered with a side cover, and this side cover side is set as a power extraction side. A lubricating oil filter is provided on the cylinder block on the opposite side so that it can be attached and removed from the opposite side.

According to the above invention of this application, since the lubricating oil pump is provided on the side opposite to the side cover, the lubricating oil pump can be installed from the opening of the cylinder block before the side cover is attached. There is no need to engage the gears through the gap.

Furthermore, since this lubricating oil pump is installed on the cylinder block on the opposite side from the power extraction side, it does not interfere with the working machine when it is extracted during maintenance.

In addition, since the crankshaft is supported via a plain bearing on the cylinder block wall where the lubricating oil pump is attached, a lubricating oil passage can be formed directly from the lubricating oil pump to the crankshaft, and the passage structure is becomes easier.

Furthermore, as described above, the lubricating oil pump is provided on the cylinder block wall, and the driving shaft of this lubricating oil pump is connected to the crankshaft on the opposite side from the gear mechanism such as the camshaft.
Since it is driven via a small-diameter intermediate shaft that rotates in pairs, there is plenty of space for mounting the drive shaft, and the most appropriate lubricating oil pump arrangement can be selected.

In the fourth and fifth inventions of this application, since the lubricating oil filter is provided on the side opposite to the side wall that is not on the power extraction side, the lubricating oil filter can be easily installed and removed, and the lubricating oil filter can be easily installed and removed. Since the case for installing the filter is formed integrally with the cylinder block wall, the passage configuration with the lubricating oil pump, which is also installed on the cylinder block wall, is simple and the number of parts is reduced.

Embodiment FIG. 4 is a vertical section of an internal combustion engine according to the present invention taken along the crankshaft direction. In the figure, 21 is a cylinder block, 22 is a piston inserted into a cylinder in the upper part of this cylinder block, and 23 is the cylinder head also installed on the top surface of the cylinder block, 24.24 is,
It is an intake or exhaust valve inserted into the cylinder head. Furthermore, a valve arm chamber cover 25 is attached on this cylinder head 23. 26 is a crankshaft supported within the cylinder block 21;
1 is open at one end in the direction of the crankshaft 26, and this opening 27 is covered with a side cover 28. Then, one end of the crankshaft 26 is inserted into this side cover 28 and the other end is inserted into the opposite cylinder block wall 29, and both bearings 30 and 31 are inserted into the cylinder block wall 29 on the opposite side.
It is supported by On the cylinder block wall 29 side, a flywheel 33 integrally provided with a cooling fan 32 is attached to the end of the crankshaft 26 that protrudes from the cylinder block wall 29. The end of the crankshaft 26 that protrudes from the side cover 28 is the power extraction side, and various working machines are directly connected thereto.

FIG. 3 is a side view of the cylinder block 21 seen from the opening 27 side, and in the cylinder block wall 29 opposite to the opening 27, a crankshaft insertion hole is located along a line ζ passing through the cylinder center line. 35, a balancer shaft insertion hole 36 is formed diagonally below, and a camshaft insertion hole 37 is formed diagonally above, and the crankshaft 26 between these camshaft insertion holes 37 and balancer shaft insertion hole 36 is A lubricating oil pump case 38 is integrally formed on the opposite side. The shaft support structure of the camshaft 39 and the balancer shaft 40 is shown in FIG. Furthermore, in FIG. 2, the main body mechanism of the pump 41, such as a pump gear, is inserted from the outside of the cylinder block 21 on the flywheel 33 side. A drive shaft 42 is inserted and attached from the flywheel 33 side so as to protrude into the cylinder block 21, and a pump driven gear 43 and a speed regulating flyweight mechanism 44 are attached to the opening 27 of the drive shaft 42. Attached from the side. 45 is a lid that covers the opening of the pump case 38 that opens to the outside of the cylinder block 21. The pump driven gear 46 is connected to the drive gear 4 on the balancer shaft 40 on the side of the cylinder block wall 29 that is opposite to the drive gear mechanism 47 such as the camshaft 39 installed on the side cover 28 side.
8 and is driven by a balancer shaft 40, which is an intermediate shaft, via this drive gear 48.

In addition, the gear mechanism 47 on the side lid (28) side includes a balancer gear 50 that engages with a crank gear 49 and is attached to the balancer shaft 40 in order to drive the balancer shaft 40, and further drives a camshaft 39 from this balancer shaft 40. The balancer shaft 40 is composed of a camshaft drive gear 51 and a driven gear 52 which are attached to the balancer shaft 40 and the camshaft 39 and mesh with each other.

A filter case 54 with an insertion opening 53 on the flywheel 33 side is mounted on the cylinder block wall 29 directly below the pump case 38 .
It is formed in one piece so that it crawls along the bottom wall. and,
A lubricating oil filter 55 has an insertion port 53 in this case 54.
It is inserted and installed.

An L-shaped rib 56 communicating with the inside of the filter case 54 and formed along the bottom wall of the cylinder block 21 forms a suction passage 57 that sucks lubricating oil from the center of the oil nozzle at the bottom of the cylinder block 29. There is. The lubricating oil sucked from this suction passage 57 enters the outer periphery of the lubricating oil filter 55 inside the filter case 54, passes through the inside of the lubricating oil filter 55, and then passes through the lubricating oil filter 55.
The oil is sucked out to the lubricating oil pump 41 side from an outlet 58 formed near the end on the insertion port 53 side. In the cylinder block wall 29 on the lubricating oil pump 41 side, a vertical communication passage 59 that communicates the filter case 54 and the lubricating oil pump 41 is formed by a rib 60 integrally formed on the cylinder block wall 29. , whereby the lubricating oil that has passed through the lubricating oil filter 55 is transferred to the lubricating oil pump 41.
I try to inhale it. Furthermore, this lubricating oil pump 4
A horizontal JJ IJ PRO 2 is integrally formed across the crankshaft bearing part 61 of the cylinder block 21 from the case 38 of the cylinder block 21, and lubricating oil is supplied to the crankshaft bearing part 61 through a discharge passage 63 formed in the rib 62. We are trying to supply it. After lubricating the plain bearing 31 of this bearing part (61), the lubricant is supplied to the crank pin 66 part through the drilled hole 65 formed in the arm 64 (Fig. 1) of the crankshaft 26, and then to the crank pin 66 part. It is supplied from the arm 65 to the crankshaft bearing 30 of the side cover 28, which is also on the opposite side.

Effects of the Invention As described above, according to this invention, the lubricating oil pump is installed on the cylinder block wall on the opposite side from the side cover, which is the power extraction side of the working machine, so it is different from the conventional one installed on the side cover. Unlike this, it can be attached to the cylinder block before attaching the side cover, so the meshing of the gears that drive the pump can be visually checked through the opening, which has the effect of greatly simplifying the mechanical work. Since the pump lid can be removed on the opposite side of the work equipment, maintenance work on the pump is facilitated, and on the other hand, when installing the work equipment, there is no need to take such pump maintenance into consideration. Various types of work equipment can be installed. Furthermore, since the crankshaft bearing section to which the bearing is supplied by this lubricating oil pump has a flat bearing on the same side as the lubricating oil pump, the passage on the rib is integrally formed on the same cylinder block wall, and the lubricating oil is The pump and bearing can be connected directly through a single passage over the shortest distance, making the lubricating oil passage simple. By forming the lubricating oil passage in the cylinder block in this way, ribs for the passage are formed in the cylinder block, which has the effect of increasing the strength of the cylinder block where strength is most needed. be. At that time, the lubricating oil pump is driven on the side opposite to the side cover by a gear attached to an intermediate shaft such as a balancer shaft, so the lubricating oil pump is driven on the side opposite to the side cover. This makes it possible to use a small-diameter pump gear, which allows more leeway in the arrangement of the lubricating oil pump's driving gear. The degree of freedom in arranging the lubricating oil pump is improved by making the passage horizontal and straight, which is easy to process, and the most desirable pump arrangement can be selected. Furthermore, in this invention, since the lubricating oil filter case is integrally formed on the cylinder block wall on the same side as the lubricating oil pump, this also has the effect of reinforcing the cylinder block by the rib effect of the case. By integrally providing the lubricating oil filter on the cylinder block wall on the opposite side from the side cover, a continuous body passage structure is created that extends to the suction passage, which is also integrally formed in the cylinder block, so a special There is no need for suction pipes or seals, resulting in a reduction in the number of parts. In addition, the lubricating oil filter housed inside this case is designed to be inserted from the flywheel side, which is opposite to the power extraction side of the work equipment, so maintenance of this lubricating oil filter is required in the same way as the lubricating oil pump. This has the advantage of making it easier.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part of the cylinder block with the lubricating oil pump attached, Fig. 2 is a horizontal sectional view of the main part,
Fig. 3 is an overall side view of the cylinder block as seen from the opening side, Fig. 4 is an overall vertical sectional view of the internal combustion engine, and Fig. 5 is
6th horizontal sectional view of main parts of a cylinder block showing a conventional example
This figure is a side view of the cylinder block, and FIG. 7 is a horizontal sectional view showing a conventional method of assembling a side cover. 21... Cylinder block, 26... Crankshaft,
27... Opening, 28... Side cover, 29... Cylinder block wall, 30.31... Crankshaft bearing, 33
...Flywheel, 39...Camshaft, 40...
Balancer shaft, 41... Lubricating oil pump, 43... Pump driven gear, 47... Drive gear mechanism such as camshaft, 48
...Pump drive gear, 54...Filter case,
55... Lubricating oil filter patent applicant Hisashi Tarumoto No. 48 Yanmar Diesel Co., Ltd. agent Patent attorney Figure 6 Shop Figure 5

Claims (1)

[Claims] 1. Cover the cylinder block opening on the side opposite to the flywheel in the crankshaft direction with a side cover, and make this side cover side the power extraction side, and also cover one side of the crankshaft with the side cover. A cylinder block for an internal combustion engine supported by a bearing, characterized in that a lubricating oil pump is installed on the cylinder block wall on the flywheel side. 2. The cylinder block for an internal combustion engine according to claim 1, wherein among the bearings supporting the crankshaft, at least the bearing supported by the cylinder block wall on the flywheel side is a flat bearing. 3. In an internal combustion engine that is equipped with a gear mechanism that drives a camshaft, intermediate shaft, etc. in one cylinder block in the direction of the crankshaft, a lubricating oil pump is installed in the cylinder block on the opposite side in the direction of the crankshaft from this gear mechanism. A cylinder block for an internal combustion engine, characterized in that a gear for driving the engine is installed in conjunction with the intermediate shaft. 4. In an internal combustion engine in which the cylinder block opening on the side opposite to the flywheel in the crankshaft direction is covered with a side cover, the lubricating oil filter case is integrally attached to the cylinder block wall on the opposite side from the side cover. A cylinder block for an internal combustion engine, which is characterized by the following: 5. In an internal combustion engine in which the cylinder block opening on the side opposite to the flywheel in the crankshaft direction is covered with a side cover, and this side cover side is the power extraction side, the cylinder block opening can be freely attached and detached from the side opposite to the power extraction side, A cylinder block for an internal combustion engine, characterized in that a lubricating oil filter is provided on the opposite side of the cylinder block.