JPH0227111A - Oil cooling system for oil cooled engines - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an oil cooling system for an oil-cooled engine, and in particular, the present invention relates to an oil cooling system for an oil-cooled engine, and in particular, the invention relates to an oil cooling system for an oil-cooled engine, and in particular, after an oil-cooled engine is assembled in a factory, foreign objects in the cooling oil path are removed during break-in operation. This invention relates to an oil cooling system for an oil-cooled engine that is capable of collecting and removing oil.

<Prior Art> Conventionally, as shown in FIG. 7, for example, as shown in FIG. There is a system in which the oil pumped up by the pump and flowing out into the relief oil passage 6 of the pressure setting valve 5 that sets the supply pressure of lubricating oil is used as cooling oil. Normally, lubricating oil is filtered by an oil strainer 7 when it is pumped up from the oil pan 3. Furthermore, as shown in FIG. 8, the oil leaked into the relief oil passage 6 of the pressure setting valve 5 flows into the cylinder jacket 9 formed on one side of the cylinder 8 and into the cylinder head 10.
1 in order to cool down the parts of the cylinder 8 and cylinder head 10 that tend to get hot, that is, the high temperature parts, and then lead to the oil cooler 12. and,
After being cooled while passing through the oil cooler 12, the oil returns to the oil pan 3 through a return oil passage 16 that penetrates one side wall 13 of the cylinder head 10 and the wall between the bushing rod insertion hole 14 and the cylinder jacket 9. Back <Problems to be Solved by the Invention> By the way, it is known that various foreign substances get mixed into the cooling oil path during the manufacturing process of the engine 1. For example, it is difficult to completely remove casting sand for forming the head jacket 11 due to the complicated shape of the head jacket 11, and chips generated during machining of cylinders, cylinder heads, etc. It rarely (or never) enters the cooling oil path.

Such foreign matter is carried out from the cooling oil path and sent into the oil pan 3 during a break-in operation performed in a factory after the engine 1 is assembled. If such foreign matter were to pass through the oil strainer 7 and be supplied to the lubrication system, it would accelerate the wear of parts that require lubrication or cause scratches. This causes various problems such as a decrease in the discharge capacity of the gas and the generation of blow-by gas.

The present invention has been made in consideration of the above-mentioned circumstances, and is an oil-cooled engine that is capable of collecting and removing foreign matter in the cooling oil passage while running it in a factory after assembling the oil-cooled engine. The object of the present invention is to provide an oil cooling device for a cold engine.

Means for Solving the Problem> The oil cooling system for an oil-cooled engine according to the invention of claim 1 is, for example, as shown in FIG. This is based on an oil cooling system for an oil-cooled engine with a small number of oil passages 16 (both of which are partially formed continuously within one side wall 13 of the engine 1,
It is characterized by the following technical measures taken to achieve the above objectives.

That is, as shown in FIGS. 1 to 3, the engine 1 has a cooling oil passage 1 formed on one side wall 13 during the manufacturing process.
A temporary filter mounting part 19 is provided to which a temporary filter 18 is mounted to remove foreign substances mixed in the oil pipe 7 during the running-in operation, and the temporary filter mounting part 19 crosses the return oil path 16 from the outer surface of the one side wall 13. and a center hole 20 formed to have a larger diameter than the return oil passage 16, a filter mounting seat 21 formed in an annular shape concentric with the center hole 20 on the outer surface of the one side wall 13, and this filter mounting seat. The temporary filter 18 includes an end plate 24 and a center pipe 25, and the temporary filter 18 includes an end plate 24 and a center pipe 25, and a communication hole 23 that communicates the inner space 22 of the return oil passage 16 with the upstream portion 16a of the center hole 20 of the return oil passage 16. 24 has an inlet hole 26 that contacts the filter mounting seat 21 in an oil-tight manner when the temporary filter 18 is mounted on the temporary filter mounting portion 19 and communicates the inner space 22 with the inside of the temporary filter 18. However, when the temporary filter 18 is attached to the temporary filter mounting part 19, the center pipe 25 is fitted into the center hole 20 in an oil-tight manner, and the return oil passage 16 is connected to an upstream portion upstream of the center hole 20. 16a and a downstream portion 16b, and has an outlet hole 27 in its peripheral wall that communicates the inside of the temporary filter 18 with the downstream portion 16b; Center hole 20 opened by removing temporary filter 18 after break-in operation
and a plug body 2 that covers the communication hole 23 individually or in common.
8, 29, and 30.

Further, the oil cooling device for an oil cooled engine according to the invention of claim 2 is provided, for example, as shown in FIG. 5 and FIG.
Cooling oil heated by cooling the oil pan 3
The present invention is based on an oil cooling system for an oil-cooled engine in which at least a portion of the return oil passage 16 is formed on one side wall 13 of the engine 1. It is characterized by the fact that such technical measures were taken.

That is, as shown in FIGS. 5 and 6, for example, the engine 1 has a temporary filter 18 on one side wall 13 of the engine 1 for removing foreign matter that has entered the cooling oil path 17 during the manufacturing process during the break-in operation. The return oil passage 16 is divided within one side wall 13 into an upstream portion 16a and a downstream portion 16b, which are connected via the temporary filter attachment portion 19. Filter mounting part 1
Reference numeral 9 denotes a center hole 20 communicating from the outer surface of the one side wall 13 to the downstream portion 16b, a filter mounting seat 21 formed in an annular shape concentric with the center hole 20, and an inner space of the filter mounting seat 21. 22 to the upstream portion 16a, the temporary filter 1B includes an end plate 24 and a central pipe 25, and the end plate 24 connects the temporary filter 18 to the temporary filter mounting portion 19. When installed, the central pipe 25 has an inlet hole 26 that contacts the filter mounting seat 21 in an oil-tight manner and communicates the inner space 22 with the inside of the temporary filter 18. The temporary filter 18 is configured to connect the inside of the temporary filter 18 to the center hole 20 in an oil-tight manner when attached to the filter attachment part 19, and furthermore, the temporary filter 18 is removed after the engine 1 is run-in. A stopper 30 is provided to cover the opened inner space 22 in a state where the communication hole 23 and the center hole 20 are communicated with each other.

<Operation> In the invention of claim 1 or claim 2, the temporary filter 18 is installed in the filter installation part 19 after the assembly of the engine 1 is completed and before the break-in operation is performed. Then, the cooling oil that has circulated through the cooling oil path 17 by performing the enlightening operation is introduced into the temporary filter 18 from the upstream portion 16a through the communication hole 23, the inner space 22, and the inlet hole 26. The cooling oil from which foreign matter has been removed by filtration within the temporary filter 18 flows out from the outlet hole 27 to the downstream portion 16b and is returned to the oil pan 3. Therefore, foreign matter that has entered the cooling oil passage 17 during the running-in period can be removed by the temporary filter 1.
8 and removed, thereby eliminating the possibility that such foreign matter will later be mixed into the lubricating system.

In addition, in the invention of claim 1 or claim 2, after the break-in operation is completed, the temporary filter is removed, and the plugs 28, 29, 30 prevents cooling oil from leaking to the outside from the communication hole 23, the center hole 20, or the inner space 22. Therefore, at the time of shipment,
By removing the temporary filter, the product can be shipped without increasing the packaging size.

In addition, in the present invention, the inlet hole 26 of the temporary filter 18 is communicated with the downstream portion 16b, and the outlet hole 27 or the central pipe 20 is connected to the downstream portion 16b.
It is possible to reverse the flow direction of the cooling oil in the temporary filter 18 by making the temporary filter 18 communicate with the upstream portion.

<Embodiment> Hereinafter, an oil cooling system for a partially oil-cooled engine according to an embodiment of the invention of claim 1 will be described with reference to FIGS. 1 to 3.

For cooling the engine 1, the oil that has flowed into the relief oil passage 6 of the pressure setting valve 5 (see Fig. 7) of the lubrication system is used.
As shown in FIG.
-9 and the cylinder head 11 formed in the cylinder head 1O to cool the high temperature parts of the cylinder 8 and the cylinder head 1o.
1 is guided to an oil cooler 12 located in front of the oil cooler 12. Then, while passing through the oil cooler 12, the engine 1 is forcibly cooled by cooling air generated by a cooling fan (not shown) placed in front of the engine 1. The cooling oil leaving the oil cooler 12 is returned to the oil pan 3 (see FIG. 7) below the crank room 15 through a return oil passage 16. This return oil passage 16 passes through one side wall 13 of the cylinder head 10 and the wall portion between the psoschrond insertion hole 14 and the cylinder head 10, and communicates with the upper part of the crank room 15.

A temporary filter mounting portion 19 is provided on one side 913 of the cylinder head 10 of the engine 1 to which a temporary filter 18 is mounted to remove foreign matter that has entered the cooling oil path 17 during the manufacturing process during a break-in operation.

The temporary filter mounting portion 19 includes a center hole 20, a filter mounting seat 21, and a communication hole 23.

The center hole 20 is formed to cross the return oil passage 16 at a right angle from the outer surface of the one side wall 13 at a height approximately at the center of the cylinder head 10, and to have a larger diameter than the return oil passage 16.

Further, the filter mounting seat 21 is formed to protrude outward in an annular shape concentric with the center hole 20, and a cylindrical inner space 22 having a predetermined depth is formed inside thereof.

Further, the communication hole 23 is formed in parallel with the center hole 20 so as to communicate with the inner space 22 and the portion 16a upstream of the center hole 20 of the return oil passage 16.

Temporary filter 18 attached to temporary filter attachment part 19
comprises an end plate 24, a center pipe 25, a bottomed cylindrical filter case 32, and a filter element 33 housed in the filter case 32, and is fixed to the temporary filter mounting part]9 by a holding plate 35. .

The holding plate 35 is formed into a shape that fits the filter case 32 therein and covers almost one side of the cylinder head 10 from the front, as shown by the imaginary lines in FIGS. 1 and 3. It is fixed to a mounting seat 34 provided on the outer surface of the side wall 13 with four bolts (not shown). By forming the outer end surface of the mounting seat 34 and the outer end surface of the filter mounting seat 21 to be substantially flush with each other, when the temporary filter 18 is mounted on the temporary filter mounting portion 19, the end plate 24 is flush with the filter mounting seat 21. They are brought into close contact. The end plate 24 also has an inlet hole 26 that closes the open end of the filter case 32 in an oil-tight manner and communicates the inner space 22 with the inside of the temporary filter 18 .

The center pipe 25 is connected to the center of the end plate 24, and when the temporary filter 18 is attached to the temporary filter attachment part 19, it is fitted into the center hole 20 in an oil-tight manner and the return oil passage 16 is connected to the center hole. The temporary filter 18 is divided into an upstream part 16a on the upstream side and a downstream part 16b on the downstream side of the temporary filter 18, and the inside of the temporary filter 18 is communicated with the downstream part 16b through an outlet hole 27 formed in the peripheral wall thereof. It has become.

Further, the engine 1 is provided with plugs 28 and 29 that individually cover the center hole 20 and the communication hole 23, which are opened by removing the temporary filter 18 after the break-in operation.

In this oil cooling system for a partially oil cooled engine, the temporary filter 18 is attached to the filter attachment part 19 after assembly of the engine 1 is completed and before running-in. The cooling oil that has circulated through the cooling oil path 17 during the break-in operation is introduced into the temporary filter 18 from the upstream portion 16a through the communication hole 23, the inner space 22, and the inlet hole 26. The cooling oil from which foreign matter has been removed by filtration within the temporary filter 18 flows out from the outlet hole 27 to the downstream portion 16b and is returned to the oil pan 3. As a result, foreign matter that has entered the cooling oil path 17 during the manufacturing process is collected and removed by the temporary filter 18 during the break-in period, and it is possible to eliminate the possibility that such foreign matter will be mixed into the lubrication system later.

In addition, in the oil cooling system of this partially oil cooled engine, after the break-in operation is completed, the temporary filter 18 is removed, and the plugs 28 are inserted into the communication hole 23 and the center hole 20 which are opened thereby.
・By driving 29, the communication hole 23 and center hole 20
This prevents cooling oil from leaking to the outside. By removing the temporary filter 18 in this manner, the product can be shipped without increasing the packaging size.

Furthermore, the return oil passage 16 is connected to one side wall 13 of the cylinder head 10.
Since the return oil passage 16 in the cylinder head 10 can be easily formed as a simple through hole by casting, drilling, etc.

In the above-mentioned embodiment, the communication hole 23 and the center hole 20 are respectively closed by separate plug bodies 28 and 29. For example, as shown in FIG. 4, the inner space 22
The communication hole 23 and the center hole 20 may be closed with one common stopper 30 driven into the hole. In this case, the communication hole 23 and the center hole 20 may be communicated with each other through the inner space 22.

Next, an oil cooling system for a partially oil-cooled engine according to an embodiment of the invention as claimed in claim 2 will be explained based on FIGS. 5 and 6.

In the case of this oil cooling system for a partially oil-cooled engine, the return oil passage 16 is connected to an upstream portion 16a and a downstream portion 16b within one side wall 13 of the cylinder head 10 via a temporary filter mounting portion 19. The temporary filter mounting portion 19 is divided into parts, and includes a center hole 20 communicating from the outer surface of the one side wall 13 to the downstream portion 16b, a filter mounting seat 21 formed in an annular shape concentric with the center hole 20, and It is provided with a communication hole 23 that allows the inner space 22 of the filter mounting seat 21 to communicate with the upstream portion 16a. In addition, temporary filter 1
8 is adapted to be attached to the temporary filter attachment part 19 by screwing the center tube 25 of the temporary filter 18 into the center hole 20.

Further, the inner space 22, which is opened by removing the temporary filter 18 after the engine 1 is run-in, is covered with a stopper 30 so that the communication hole 23 and the center hole 20 communicate with each other.

The rest of the configuration is similar to that of the embodiment of the invention as claimed in claim 1, so the explanation thereof will be omitted to avoid duplication.

In addition, the oil cooling system of this partially oil-cooled engine has the following features: an upstream portion 16a and a downstream portion 16b are formed separately within one side wall 13; 20, except that the upstream portion 16a and the downstream portion 16b are connected via the inner space 22, and operate in the same manner as the embodiment of the invention of claim 1 above. However, similar effects can be obtained.

<Effects of the Invention> As described above, according to the oil cooling system for an oil-cooled engine according to the invention of claim 1 or claim 2, after the engine is assembled, a temporary filter is assembled to one side wall of the engine during running-in, Foreign matter such as casting sand and cutting debris that got into the cooling oil path during the manufacturing process can be removed with a temporary filter. It is possible to prevent contamination and damage to the bearing metal, piston, cylinder, etc., thereby extending the life of the bearing metal, piston, cylinder, etc.

Further, by removing the temporary filter and driving in a plug after the break-in operation, leakage of cooling oil can be prevented, and the product can be shipped without increasing the size of the package.

Furthermore, according to the oil cooling device for an oil cooled engine of the first invention,
For example, the return oil passage near the temporary filter attachment part such as the cylinder head can be formed into a straight line by casting, drilling, etc., and the processing cost can be reduced.

[Brief explanation of the drawing]

1 to 4 show an oil cooling system for a partially oil-cooled engine according to an embodiment of the invention as claimed in claim 1, FIG. FIG. 3 is a longitudinal cross-sectional view of the main parts of the cylinder head when shipped, and FIG. 3 is a side view of the cylinder head. FIG. 4 is a longitudinal cross-sectional rear view of the main parts of a modification of the above-mentioned embodiment. 5 and 6 show an oil cooling system for a partially oil-cooled engine according to an embodiment of the invention of claim 2, FIG. The figure is a vertical cross-sectional view of the main parts at the time of shipment. 7 and 8 show the oil cooling system of a conventional partially oil-cooled engine, FIG. 7 is a rear view of the partially oil-cooled engine, and FIG.
The figure is a vertical cross-sectional rear view of the main parts of the partially oil-cooled engine. DESCRIPTION OF SYMBOLS 1... Engine, 13... One side wall, 16... Return oil path, 16a... Upstream part, 16b... Downstream part, 17... Cooling oil path, 18... Temporary construction filter, 1
9... Temporary filter attachment part, 20... Center hole, 21
...Filter mounting seat, 22...Inner space, 23...
・Communication hole, 24... End plate, 25... Center tube, 26.
...Inlet hole, 27... Outlet hole, 28... Plug body, 29
... Plug body, 30... Plug body. 1 N

Claims (1)

[Claims] 1. Cooling oil that has cooled the engine (1) is transferred to the oil pan (3).
), wherein at least a part of the return oil passage (16) is continuously formed in one side wall (13) of the engine (1). The side wall (13) is provided with a temporary filter mounting part (19) for mounting a temporary filter (18) for removing foreign matter mixed into the cooling oil path (17) during the manufacturing process during the running-in operation, The part (19) is the one side wall (13).
A center hole (20) is formed in the outer surface of the one side wall (13) to cross the return oil passage (16) and have a larger diameter than the return oil passage (16). ) and a filter mounting seat (21) formed in an annular shape concentric with the filter mounting seat (21), and a return oil passage (22) inside the filter mounting seat (21).
The center hole (20) and the communication hole (23) are connected to the plug body (28).
The oil cooling system 2 for an oil-cooled engine is characterized in that it is covered individually or in common with 29) and (30).
), wherein at least a portion of the return oil passage (16) is formed on one side wall (13) of the engine (1). A temporary filter mounting part (19) is provided for mounting a temporary filter (18) for removing foreign matter that has entered the cooling oil path (17) during the manufacturing process during running-in, and the return oil path (16) is , within the one side wall (13), an upstream portion (
16a) and a downstream portion (16b), and the temporary filter mounting portion (19) is formed on one side wall (13).
a center hole (20) that communicates with the downstream portion (16b) from the outer surface of the filter mounting seat (21); a filter mounting seat (21) formed in an annular shape concentric with the center hole (20); The inner space (22) of the upstream portion (16a
), and the inner space (22) is covered with a stopper (30) to allow communication between the communication hole (23) and the center hole (20). Oil cooling system for oil-cooled engines