JPS6017926B2 - Internal combustion engine oil pan structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to an oil pan structure for an internal combustion engine.

In an internal combustion engine, lubricating oil is supplied to smooth the movement of each sliding part of the engine body during engine operation and to absorb the frictional heat generated therein. This lubricating oil is stored in the oil reservoir of the oil pan attached to the bottom of the engine body, and is sucked up from here by the oil pump, passed through the oil filter, and then sent to each slide of the engine body through the main gallery. It is sent to the moving parts, lubricated and cooled, and then falls back into the oil pan in a warmed state. The lubricating oil returned to the oil pan is cooled by natural heat radiation and is circulated and supplied to each sliding section of the engine body again. However, in conventional oil pans that store this lubricating oil, the lubricating oil used for lubrication and cooling falls directly into the oil reservoir, so when the lubricating oil temperature is low, such as immediately after starting the engine, It has a large heat capacity and the temperature rises slowly. For this reason, it takes a long time for the lubricating oil to reach the appropriate viscosity, which is the temperature for proper lubrication, especially during startup and warm-up, and during this time the resistance at the engine's sliding parts is large, resulting in poor fuel efficiency. There is a problem. Conventionally, in order to hasten the temperature rise of lubricating oil, the oil pan was divided into front and rear parts, so that when the temperature was low, the lubricating oil in the first chamber was circulated, and when it was warm, the lubricating oil was circulated in all chambers. (Refer to Publication No. 1987-28743), but this is because the oil pan wall of the first chamber is exposed to the outside air.
It has the disadvantage that it is cooled by natural heat dissipation and does not improve heat sufficiently.

The present invention has been made in view of the above-mentioned circumstances, and is provided with an oil receiving section above the oil reservoir section to receive the lubricating oil falling from various parts of the engine, and the lubricating oil that has absorbed heat is temporarily stored there. The aim is to solve the problems of the conventional technology by using heat from the engine to warm the lubricating oil supplied to various parts of the engine.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, lubricating oil collected in an oil reservoir 3 of an oil pan 2 attached to the lower part of an engine body 1 is passed through an oil strainer 6 provided at the tip of a suction pipe 5 following an oil pump 4. The oil is sucked up, pressure regulated, and thin impurities are removed by an oil filter 7, and then sent from the main gallery 8 to each sliding part 10 of the engine via a branch pipe 9.

The oil pan 2 has an oil receiving portion 11 formed above a conventional oil reservoir portion 3 for receiving falling warm lubricating oil. A portion of the suction pipe 5 is stored in the oil receiving portion 11, and is disposed through the lubricating oil and extending to the oil reservoir portion 3 via the oil receiving portion 11. Furthermore, a small hole 12 for adjusting the lubricating oil level is formed in the side of the oil receiving part 11, and an on-off valve 14 that opens and closes depending on the lubricating oil temperature is interposed in the oil flow row 3 provided at the bottom. has been done. In this configuration, when the engine is started, the oil pump 4 is operated to suck up lubricating oil from the oil reservoir 3 of the oil pan 2 through the suction pipe 5 and forcefully send it to each tank moving part 10 of the engine body 1.

This lubricating oil lubricates and cools each sliding part 10, absorbs heat, and falls into the oil pan 2, but does not fall directly into the oil reservoir part 3, but instead falls into the oil receiving part 11. The on-off valve 14 of the oil receiver 11 was closed because the lubricating oil temperature was still low, and it fell; the boar oil does not immediately return to the oil reservoir 3 and accumulates in the oil receiver 11, so the oil receiver 11 lubricating oil temperature increases. When the lubricating oil sucked up from the oil reservoir 3 by the oil pan 4 passes through the suction pipe 5, it is heated by the heat of the lubricating oil in the oil receiving part 11 and sent to each sliding part 10 of the engine body. become.

Since the capacity of the oil receiver 11 is smaller than the conventional case where the entire amount of lubricating oil is collected in one oil reservoir, the temperature of the lubricating oil rises quickly, and therefore the viscosity of the lubricating oil is far from decreasing. Frictional resistance at the moving part 10 is reduced, and fuel efficiency can be improved. After the engine is started, when the temperature of the lubricating oil in the oil receiving part 11 reaches a predetermined temperature, the on-off valve 14 opens, and the lubricating oil in the oil receiving part 11 flows down to the oil reservoir part 3 below. The heating action of the lubricating oil in the section 11 is stopped; excessive temperature rise of the blade lubricating oil is prevented.

Note that when the on-off valve 14 is in the open state, the oil receiving portion 11
The amount of lubricating oil flows out from the small hole 12 when it reaches a predetermined level, so that it is kept approximately constant. FIG. 3 shows details of the on-off valve 14.

In FIG. 3, a cylindrical oil outlet 13 is provided at the bottom of the oil receiving portion 11, and an on-off valve 14 is interposed in the outlet 13. As shown in FIG.

The construction of the on-off valve 14 is such that a rubber bag 16 in which a thermowax 15 is sealed is stored in a container 17, and a valve body 1 is placed in the container 17.
A piston 19 integral with the valve 8 is pushed in, and the valve body 18 is urged in the valve closing direction by a spring 201. The operation of the on-off valve 14 is such that when the container 17 is heated due to an increase in the lubricating oil temperature, the thermowax 15 expands and pushes out the piston 19 against the elastic force of the sprocket IJ ring 20.

Therefore, the valve body 18 moves downward and the oil outlet 13
is opened, and the lubricating oil in the oil receiving part 11 flows out into the oil reservoir part 3 through the oil outlet 13. On the other hand, when the engine stops and the lubricating oil temperature decreases, the expansion force of the thermowax 15 decreases, and the elastic force of the spring 20 pushes up the valve body 18 to close the valve.

Note that it is desirable that the temperature sensing container 17 be located as high as possible above the oil outlet 13. FIG. 4 shows another example of the on-off valve.

A small hole 21 at the bottom of the oil receiving part 11 serves as an oil outlet.
a valve arm 23 having a valve body 22 at one end;
is attached to the bottom of the oil receiving portion 11 and elastically biased counterclockwise around a support shaft 25 by a spring 24, and normally the small hole 21 is closed by the valve body 22. Then, as in FIG. 3, a container 28 containing a rubber bag 27 in which thermowax 26 is sealed is installed in the oil receiving portion 11, and a piston 29 is projected and brought into contact with the valve arm 23. The operation of this on-off valve is such that when the thermowax 26 in the container 28 expands due to the rise in lubricating oil temperature and pushes out the piston 29, the valve arm 23 moves clockwise around the support shaft 25 against the elastic force of the spring 24. The valve body 22 is separated from the small hole 21, the small hole 21 is opened, and the lubricating oil flows downward.

On the other hand, when the engine stops and the lubricating oil cools down, the elastic force of the spring 24 causes the valve arm 23 to rotate counterclockwise, causing the valve body 22 to close the small hole 21. Note that the configuration of the on-off valve is not limited to that described above, and may be configured to be electrically opened and closed.

As described above, according to the present invention, when the lubricating oil temperature is low, such as immediately after starting the engine, the rise of the lubricating oil temperature can be delayed, so that the viscosity of the lubricating oil can be further prevented from decreasing in various parts of the engine. resistance is reduced. Therefore, fuel efficiency during warm-up can be significantly improved compared to the conventional technology.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing one embodiment of the oil pan according to the present invention attached to the engine body, Fig. 2 is a side sectional view of Fig. 1, Fig. 3 is an enlarged sectional view of the valve part, and Fig. 4 The figure is a sectional view showing another embodiment of the on-off valve. 1... Engine body, 2... Oil pan,
3...Oil reservoir, 4...Oil pump, 5
...Suction pipe, 11...Oil receiving part. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. An oil receiver is provided above the oil reservoir of the oil pan to store a certain amount of lubricating oil falling from various parts of the engine and allow the surplus amount to fall into the oil reservoir. A suction pipe is installed to guide lubricating oil from the oil reservoir to the oil pump through the lubricating oil in the oil reservoir, allowing heat exchange between the lubricating oil in the oil receiver and the lubricating oil passing through the suction pipe. Characteristic oil pan structure of internal combustion engine. 2. A patent claim in which the oil receiving part has an on-off valve that opens when the temperature of the lubricating oil in the receiving part reaches a predetermined temperature or higher, and the lubricating oil flows down into the oil reservoir below when the valve is opened. An oil pan structure for an internal combustion engine according to scope 1.