JPH04283399A - Oil cooler - Google Patents

Abstract

PURPOSE:To provide the title cooler, which is used for cooling engine oil, reduces oil-flow resistance caused by an inner fin part, and ensures the heat radiant amount of the engine oil. CONSTITUTION:The title cooler has an oil flowing-out opening which is formed at the central part thereof, an oil intake 19 and an oil outlet 21 which are at both sides of the oil flowing-out opening and are on the common axis therewith, and an inner fin part 27 which is held between them. Oil-flow ways on the inner fin part 27 having low oil-flow resistance, are formed almost in the circumferential direction of a circle around the center of the oil flowing-out opening.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cooler for cooling engine oil.

0002

[Prior Art] When the engine oil temperature exceeds a permissible value, the engine oil (hereinafter referred to as "oil") deteriorates rapidly, and the resulting decrease in oil film thickness damages the sliding parts of the engine. Therefore, conventionally,
As disclosed in Japanese Patent No. 080, many vehicles are equipped with an oil cooler that cools oil using engine cooling water.

FIG. 6 shows a conventional structure of an oil cooler using a circular plate member and corrugated inner fins (hereinafter referred to as "inner fins"). Oil passages 11 and cooling water passages 13 are alternately formed by stacking the first plate 7 and the second plate 9. In the oil passage 11, an inner fin 15 is provided to improve the heat dissipation performance of the oil cooler 1 by stirring and turbulating the oil.
is interposed.

[0004] In addition, a through hole 17 is formed in the center of the core portion 5 by drilling the plates 7 and 9 and the inner fin 15, respectively.
are formed, and an oil inlet 19 and an oil outlet 21 opening into the oil passage 11 are formed coaxially with each through hole 17 in between, by drilling through the plates 5, 7 and the inner fin 15. Then, the oil cooler 1 is fixed by the stud bolt 23 inserted into the through hole 17.
is attached to the engine, heated oil O
After flowing into the oil passage 11 from the oil inlet 19 through the oil outflow hole 25 provided coaxially with the central axis of the stud bolt 23, the engine circulates through the cooling water passage 13 while reaching the oil outlet 21. is cooled with cooling water of
The oil is fed back into the engine etc. from the oil outlet 21.

[0005]

However, in the oil cooler 1 described above, there is an imbalance in oil flow resistance within the oil passage 11 from the oil inlet 19 to the oil outlet 21 due to the direction in which the inner fins 15 are formed. It has the problem of existing. FIG. 7 is a plan view of the inner fin 15 showing the flow of oil O from the oil inlet 19 to the oil outlet 21, but all the peaks 15a and valleys 15b of the inner fin 15 as shown in FIG. 8 are shown in FIG. When the inner fin 15 is installed in the oil passage 11 so as to be perpendicular to the straight line L connecting the centers of the oil inlet 19 and the oil outlet 21, the oil shown in the dashed line in FIG. Although the amount of heat dissipated is good due to stirring and turbulence by the inner fins 15 against the flow of O, the disadvantage is that the peaks 15a and troughs 15b of the inner fins 15 act as a kind of barrier, increasing oil flow resistance. was there. In the B section of the inner fin 15, although the oil flow resistance by the inner fin 15 against the flow of the oil O shown by the broken line in FIG. That is, the inner fin 15 has a straight line L.
An oil flow path with low oil flow resistance is formed in a direction perpendicular to the straight line L, and an oil flow path with high oil flow resistance is formed parallel to the straight line L.

Furthermore, as shown in FIG.
When all the peaks 15a and valleys 15b are arranged parallel to the straight line L connecting the centers of the oil inlet 19 and the oil outlet 21, the oil flow resistance is low from the oil inlet 19 to the oil outlet 21. Since the oil flow path is formed, the oil O does not flow toward the outer circumference of the inner fin 15, but rather flows from the oil inlet 19 to the oil outlet 21 in a short circuit.
Oil O could not be cooled sufficiently.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide an oil cooler that reduces the oil flow resistance due to the inner fins and also ensures a reliable amount of heat dissipation from the oil. .

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an oil outflow hole provided in the center, an oil inlet and an oil outlet provided coaxially with the oil outflow hole sandwiched therebetween. and an inner fin interposed between them, the oil flow path with low oil flow resistance of the inner fin is arranged in the circumferential direction of a circle centered on the center of the oil outflow hole. It is formed roughly along the

[0009]

[Operation] According to the present invention, after heated oil flows into the oil passage from the oil inlet through the oil outflow hole, it is cooled by engine cooling water circulating in the cooling water passage while reaching the oil outlet. The oil is then fed back into the engine etc. from the oil outlet.

[0010]The inner fin interposed in the oil passage has an oil flow passage with low oil passage resistance formed in the inner fin approximately along the circumferential direction of a circle centered on the center of the oil outflow hole. Therefore, the oil flows smoothly through the oil flow path with little oil flow resistance, and when the oil flows approximately along the circumferential direction of a circle centered on the center of the oil outflow hole, the inner fins allow the oil to flow smoothly. Stirring and turbulence will be created.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the parts other than the inventive parts have the same configuration as the oil cooler 1 shown in FIG. 6, so the description thereof will be omitted here, and only the inventive parts will be described. Components that are the same as those in the conventional example are designated by the same reference numerals.

In FIG. 1, reference numeral 27 denotes a circular corrugated inner fin (hereinafter referred to as "inner fin"), and like the inner fin 15 shown in FIG. It is inserted into an oil passage 11 of a core portion of an oil cooler formed by laminating plates 9. And inner fin 27
A through hole 17 is formed in the center corresponding to the through hole 17 provided in each plate 7, 9, and an oil inlet 1 opens into the oil passage 11 coaxially with the through hole 17 in between.
9 and oil outlet 21 are connected to the oil inlet 1 of plates 7 and 9.
9 and the oil outlet 21. As in the conventional case, the oil cooler according to this embodiment is attached to the engine by stud bolts 23 inserted into the through holes 17.

Further, as shown in FIG. 2, the inner fin 27 is connected to a straight line L connecting the centers of the oil inlet 19 and the oil outlet 21, and the straight line L passing through the center point of the oil outlet hole 25 of the stud bolt 23. 4 with the straight line M perpendicular to
It is formed of fan-shaped divided inner fins 27a. In each divided inner fin 27a, a peak portion 27b and a trough portion 27c as shown in FIG. The peaks 27b and troughs 27c of the fins 27a are
By arranging the book at an angle of 45° with respect to the straight lines L and M, a circle centered on the center of the oil outflow hole 25, that is, in this embodiment, the inner fin 27 is An oil flow path with low oil flow resistance is arranged approximately along the circumferential direction.

Conventionally, inner fins for this type of oil cooler have been produced by simply punching out a circular shape from a single inner fin forming plate having peaks and troughs, and forming an inner fin as shown in FIG. 15 is formed. However, in order to manufacture the inner fin 27 in this embodiment, as shown in FIG. , Rotate the cutter 180 degrees and move it vertically and horizontally to cut the fan-shaped divided inner fins 27a into one plate material 2.
All you have to do is hit multiple numbers starting from 9. Also, at this time, arc-shaped notches 31 and 33 for forming the through hole 17, the oil inlet 19, and the oil outlet 21 are simultaneously punched out at predetermined locations.

Next, one divided inner fin 27a
If the other divided inner fins 27a adjacent to the divided inner fins 27a are reversed and the four divided inner fins 27a are arranged in a circular shape between the stacked first plate 7 and second plate 9, the notch 31 of each divided inner fin 27a can be formed. , 33 form an inner fin 27 in which the through hole 17, the oil inlet 19, and the oil outlet 21 are formed. Then, by integrally brazing each split inner fin 27a with the plates 7, 9, the casing 3 of the oil cooler, etc. in a furnace, the inner fin 27 in which each split inner fin 27a is integrated is inserted into the oil passage 11. Then, the oil cooler according to this embodiment is manufactured.

Since the oil cooler according to this embodiment is constructed as described above, when the oil cooler is attached to the engine using the stud bolts 23 inserted into the through holes 17, the heated oil O can be heated as in the conventional case. The oil inlet 1 passes through the oil outflow hole 25 in the stud bolt 23.
After flowing into the oil passage 11 from the oil outlet 21
During this time, the oil is cooled by the engine cooling water circulating through the cooling water passage 13, and is then fed back into the engine etc. from the oil outlet 21.

As described above, the inner fin 27 interposed in the oil passage 11 connects the peaks 27b and troughs 27c of each divided inner fin 27a to the straight line L,
Since it is arranged at an angle of 45° with respect to M, in the C portion of the inner fin 27 shown in FIG.
Also, in the D section, the oil O flows as shown by the solid line.
flows in parallel along the peaks 27b and troughs 27c of the inner fins 27a. Furthermore, in the E section, as shown by the broken line, the oil O flows from the opposite direction to the C section at a maximum angle of 45° with respect to the inner fin 27, and as a result,
The oil O flows through an oil flow path with low oil flow resistance formed approximately along the outer periphery of the inner fin 27, and the oil O flows through the oil outlet 2.
This will lead to 1.

Furthermore, as mentioned above, in the C section and the E section of the inner fin 27, the oil O flows into the inner fin 2.
By flowing at a maximum angle of 45° with respect to 7, stirring and turbulent flow of the oil O is achieved. Therefore, according to the present embodiment, by reducing the oil passage resistance of the oil O by the inner fins 27, it is possible to downsize the oil pump, and at the same time, it is possible to ensure a reliable heat dissipation amount of the oil O.

Further, according to this embodiment, as shown in FIG. 4, instead of the conventional method of punching out the inner fins 15 in a circular shape from a single plate 29, fan-shaped inner fins 15 are punched out from a single plate 29. Since a plurality of divided inner fins 27a are punched out, the material yield of the inner fins is improved.
Material costs can be reduced. Note that instead of the split inner fins 27a, as shown in FIG.
The fan-shaped divided inner fins 35b have peaks 35c and troughs 3 in the same direction as the divided inner fins 27a.
5d, and these divided inner fins 3
5a and 35b may form a circular inner fin 35.

The inner fin 35 is connected to the oil passage 1 formed by the first plate 7 and the second plate 9.
1, it is possible to achieve the intended purpose as in the above embodiment. In addition, in the embodiment of FIG.
The inner fin 27 is divided into four inner fins 27a.
The inner fin 35 is formed of two divided inner fins 35a and 35b, but the number of divided inner fins is not limited to four.

Although not shown, the inner fins are integrally formed with a press so that an oil flow path with low oil passage resistance is formed approximately along the circumferential direction of a circle centered on the center of the oil outflow hole. It may be formed and then punched out into a circular shape, and forming the inner fin with a plurality of divided inner fins as in the above embodiment is not the gist of the present invention. Furthermore, it goes without saying that the inner fin is not limited to the corrugated inner fin type described above.

[0022]

[Effects of the Invention] As described above, according to the present invention, it is possible to provide an oil cooler that can secure a reliable amount of heat dissipation from oil while reducing the oil flow resistance caused by the inner fin. became.

[Brief explanation of the drawing]

[Fig. 1] A first oil cooler according to an embodiment of the present invention.
It is an exploded perspective view of a second plate and an inner fin.

FIG. 2 is a plan view of the inner fin showing the flow of oil from the oil inlet to the oil outlet.

FIG. 3 is a partially enlarged perspective view of the inner fin.

FIG. 4 is a plan view of the plate material showing the cutting of the split inner fin.

FIG. 5 is a plan view showing a modification of the inner fin.

FIG. 6 is a sectional view of a conventional oil cooler.

FIG. 7 is a plan view of the inner fin showing the flow of oil from the oil inlet to the oil outlet.

FIG. 8 is a partially enlarged perspective view of the inner fin.

FIG. 9 is a plan view showing another structure of a conventional inner fin.

[Explanation of symbols]

7 First plate 9 Second plate 11 Oil passage 17 Through hole 19 Oil inlet 21 Oil outlet 23 Stud bolt 25 Oil outflow hole 27 Inner fin 27a Split inner fin 27b Yamabe 27c Tanibe

Claims (1)

[Claims] [Claim 1] Oil outflow hole (2
5), an oil inlet (19) and an oil outlet (21) coaxially provided across the oil outflow hole (25), and inner fins (27, 35) interposed between these.
), the oil flow path of the inner fin (27, 35) with low oil passage resistance is formed approximately along the circumferential direction of a circle centered on the center of the oil outflow hole (25). An oil cooler characterized by being formed by