JPH0232802Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a supercharged engine in which the cylinder block is inclined and a supercharger is provided below the cylinder block.

(Prior art) In engines equipped with a supercharger, oil in the oil reservoir (oil pan) is pumped to guide the supercharger, and the oil is used to lubricate the bearing system of the supercharger before use. The used oil is returned from the supercharger to the oil reservoir.

Such a technique is disclosed, for example, in Japanese Utility Model Application Publication No. 107824/1983.

On the other hand, when such an engine is mounted on a cab-over type vehicle, the height of the engine, that is, the height of the cabin, can be lowered by tilting the cylinder block 1, as shown in Figure 4. It is valid in its meaning.

In the case where the cylinder block 1 is inclined, it is more effective to arrange the exhaust system 2 below the cylinder block 1 rather than above the cylinder block 1 in order to prevent the cabin floor from being heated.

In the engine mounted on a cab-over type vehicle, it is advantageous to tilt the cylinder block 1 and place the exhaust system 2 below the cylinder block 1, as described above. , then the engine will be connected to the supercharger 3 above.
If the turbocharger 3 is attached to the exhaust system 2
Since the supercharger 3 is driven by the exhaust system 2, the supercharger 3 is arranged on the same side as the exhaust system 2, that is, below the cylinder block 1.

If the cylinder block 1 is tilted in this way and the supercharger 3 is placed below it, the oil return passage 5 which returns the oil from the supercharger 3 to the oil reservoir 4 due to the relationship with the cylinder block 1 will be closed. The outlet 6 is forced to open at a low position near above the oil level of the stored oil 0.

(Problems to be Solved by the Invention) However, since the conventional outlet 6 faced directly near the upper surface of the stored oil 0 of the oil storage section 4, as shown by the two-dot chain line in FIG. Due to the inclination of the stored oil 0 when the vehicle descends a slope, the stored oil 0 enters the oil return passage 5 through the outlet 6, and due to this oil, the return oil flowing back through the oil return passage 5 becomes oily. There is an inconvenience that it becomes difficult to flow back into the storage section 4.

Further, the temperature of the supercharger 4 is generally expected to increase, and the return oil is also expected to increase in temperature accordingly. For this reason, from the perspective of preventing oil deterioration, it is preferable to cool the return oil quickly and effectively, but in reality, after simply returning it from the oil return passage 5 to the oil reservoir 4, However, heat is only dissipated through the heat exchanger, and improvements are desired.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a cylinder block that extends obliquely upward from the oil reservoir, a supercharger disposed below the cylinder block, and a cylinder block that extends obliquely upward from the oil reservoir. In a supercharged engine in which an outlet of an oil return passage from the supercharger is opened in the engine, return oil from the supercharger is smoothly circulated and the return oil is effectively cooled. There is a particular thing.

(Means and operations for solving the problem) In order to achieve the above object, the present invention has a cylinder block that extends diagonally upward from the oil reservoir, and a supercharging device installed at the bottom of the cylinder block. In a supercharged engine, in which an outlet of an oil return passage from the supercharger is opened in the oil reservoir, a partition plate is disposed above the oil level in the oil reservoir, and a partition plate is arranged above the oil surface in the oil reservoir. arranged so as to be inclined in the direction of inclination of the block, between the upper surface side of the partition plate and the lower surface side of the partition plate, and between the upper surface side of the partition plate and the lower surface side of the partition plate, A communication passage communicating with the lower surface side of the plate is provided, and an outlet of the oil return passage is located above the communication passage and directly above the upper surface of the partition plate.

With the above-described configuration, even if the oil stored in the oil storage section is tilted, the partition plate prevents the oil from entering the outlet of the oil return passage. Therefore, the return oil from the supercharger can be smoothly recirculated.

Furthermore, when the return oil flows out from the outlet of the oil return passage, the return oil flows into the communication passage while contacting the upper surface of the partition plate, allowing a large amount of the return oil to come into direct contact with the partition plate, and the contact time This allows the heat of the return oil to not only be radiated from the return oil itself into the crankcase before it enters the oil reservoir, but also to be transferred to the oil reservoir etc. via the partition plate. This means that it can be released smoothly. Therefore, the return oil can be effectively cooled.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment. FIG. 1 shows the lower main part of an engine with a supercharger (not shown) mounted on a cab-over type vehicle, and this engine also has a conventional example shown in FIG. Similarly, a cylinder block (not shown) is inclined, and a supercharger (not shown) is disposed below the cylinder block.

An oil storage section 4 is formed in the lower part of the engine, and stored oil 0 is stored in this oil storage section 4 up to a specified level. In this case, the oil reservoir 4 may be integrated with the crankcase or may be separate.

One end of an oil supply pipe 8 is contained in the stored oil 0, and an oil strainer 7 is attached to one end of the oil supply pipe 8. The other end of the oil supply pipe 8 extends to a valve mechanism (not shown) that drives intake and exhaust valves (not shown), and the stored oil 0 is passed through the oil strainer 7 to the other end of the oil supply pipe 8. It is now being supplied to

Reference numeral 9 denotes an oil return pipe, one end of which is connected to a bearing (not shown) of a supercharger (not shown), and the other end of which passes through the oil reservoir 4. It protrudes even inside. This oil return pipe 9
An oil return passage 5 is formed inside.
An outlet 6 is opened at one end of the oil return passage 5 on the oil storage section 4 side.

A V-shaped partition plate 10 is fixed to the inner surface of the oil storage part 4, and the partition plate 10 constitutes an oil suppressing part 11 on one side and an oil collection guide part 12 on the other side. ing.

The oil suppressing portion 11 is located above the oil level of the stored oil 0 in the oil storage portion 4, and is arranged to be inclined in the direction of inclination of the cylinder block 1 (FIG. 1). That is, as shown by the two-dot chain line in FIG. 1, it is set to face substantially parallel to the oil surface of the stored oil 0, which is inclined when the vehicle descends a slope. A stepped portion 13 is formed in the oil suppressing portion 11 at an intermediate portion in the inclined direction. The stepped portion 13 is penetrated by the end of the oil return pipe 9 on the outlet 6 side, so that the outlet 6 of the oil return passage 5 is located directly above the upper surface of the oil suppressing portion 11. .

On the other hand, the oil collecting guide section 12 is arranged to be inclined in the opposite direction to the oil suppressing section 11, and the oil collecting guide section 12 collects oil from the cylinder side (not shown). It has a function of guiding the oil to the V-shaped valley between the oil collecting guide section 12 and the oil suppressing section 11.

A communication path 14 is formed in the partition plate 10 . In this embodiment, the communication passage 14 is formed in a slit shape in a V-shaped valley between the oil suppression part 11 and the oil collection guide part 12, and the communication passage 14 is formed in a slit shape in a V-shaped valley between the oil suppression part 11 and the oil collection guide part 12. The upper surface side of the partition plate 10 and the lower surface side of the partition plate 10 are communicated with each other.

Therefore, according to the above configuration, even if the stored oil 0 inclines as shown by the two-dot chain line as the vehicle descends, the oil suppressing portion 11
This prevents the stored oil 0 from entering the outlet 6 of the oil return passage 5. Therefore, the return oil from the supercharger smoothly flows back through the oil return passage 5 as shown by arrow X, and further flows back into the oil reservoir 4 through the communication passage 14. .

Also, the return oil is in the oil return passage 5.
When the return oil flows out from the outlet 6, the return oil flows into the communication passage 14 while contacting the upper surface of the oil suppressing part 11, allowing a large amount of the return oil to directly contact the upper surface of the oil suppressing part 1, and This means that the contact time can be relatively long. Therefore, even before the return oil enters the oil reservoir 4, the heat of the return oil is not only radiated from the return oil itself into the crankcase, but also smoothly transferred to the oil reservoir 4 etc. via the oil suppressor 11. This means that the return oil can be effectively cooled.

FIGS. 2 and 3 show a second embodiment. In this embodiment, if the supercharger is a turbocharger type that heats up, the return oil will also rise in temperature accordingly, so the return oil is further cooled.

That is, the outlet side of the oil return pipe 9 is bent into an L-shape as shown in the plan view of FIG.
5 is placed along the inner wall of the oil storage section 4, and the cooling section 15 is cooled by the oil storage section 4 whose temperature is lowered, thereby cooling the return oil passing through the inside of the cooling section 15. be. By cooling the return oil in this way, the oil reservoir 4
By refluxing the oil into the tank, the cooling effect of the oil during circulation becomes more effective, and oil deterioration is thereby prevented.

Note that the supercharger may be of a mechanically driven type. Further, the oil collection guide section 12 may not be particularly configured. Furthermore, the partition plate 1
0 may be such that a portion other than the communication path 14 is located within the stored oil 0.

(Effects of the invention) As explained above, according to this invention, the cylinder block extends diagonally upward from the oil reservoir, the supercharger is disposed below the cylinder block, and the oil reservoir In a supercharged engine in which an outlet of an oil return passage from the supercharger is opened in the engine, return oil from the supercharger can be smoothly returned and the return oil can be effectively cooled. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the lower main part of the engine showing the first embodiment of this invention, Fig. 2 is a sectional view of the lower main part of the engine showing the second embodiment, and Fig. 3 is a sectional view of the lower main part of the engine showing the second embodiment.
4 is a longitudinal sectional view of an engine showing a conventional example. 1: cylinder block, 3: supercharger, 4: oil reservoir, 5: oil return passage, 6: outlet,
10: Partition plate, 14: Communication path.

Claims (1)

[Claims for Utility Model Registration] A cylinder block extends obliquely upward from an oil reservoir, a supercharger is disposed below the cylinder block, and a supercharger is provided in the oil reservoir. In a supercharged engine in which an outlet of an oil return passage is open, a partition plate is disposed above the oil level in the oil reservoir so as to be inclined in a direction in which the cylinder block is inclined, and the partition plate A communication passage communicating between the upper surface side of the partition plate and the lower surface side of the partition plate is provided at the lowermost side of the partition plate between the upper surface side and the lower surface side of the partition plate, and the oil return passage An outlet of the supercharged engine is located above the communication path and directly above the upper surface of the partition plate.