JPH11287115A - Oil cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent corrosion of flange outer periphery and improve heat exchange between oil and cooling water by the provision of an oil cooler of amuminium made multi-plate type. SOLUTION: Unit plate members are stacked in multiple stages wherein corrugated and multi-hole type fin plate 13 is interposed between a downward disc type first plate 11 made of aluminium clad material and an upward disc type second plate 12 having a flange 12b at its circumference, and on the uppermost first plate 11, a thick flange 15 made of aluminium is mounted to thereby form a cooling element E. An oil cooler is formed by covering the element with a cover C made of aluminium cast. In this cooler, horizontal pieces 11h, 12h of flange parts 11b, 12b on both sides of each of the first, second plates 11, 12 are extended outward to make upright pieces 11v, 12v close to a side wall of the cover C, and the upright piece 12v of the second plate 12 at the upper stage and the upright piece 11v of the first plate 11 at the lower stage are made close to each other, whereby a passage of cooling water closed between the respective unit plate members is formed. With the constitution, outgoing flow of cooling water to the outside from the side is restrained for preventing generation of corroion at the outer periphery, and facilitate heat exchange between the oil and the cooling water.

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 a vehicle, which enhances the heat exchange performance of a cooling element and suppresses corrosion.

[0002]

2. Description of the Related Art In diesel engines mounted on buses, trucks, industrial vehicles, and the like, an oil cooler is provided on the side of an engine block, and cooling water circulated by a pump from a radiator and a sliding portion of the engine from an oil pan are provided. The oil that is sent to the bearings and the bearings is subjected to heat exchange so that the oil temperature is maintained at a predetermined level.

An example of the oil cooler is shown in FIGS. 4 and 5 and comprises a hat-shaped cover member C and a multi-plate cooling element E. The cover member C has a thickness of 5 to 1.
It is made of an aluminum casting of about 0 mm, has a flat rectangular or elliptical shape, has a flange portion Cf around the open end, has a cooling water intake Ca at one end wall, and has an oil inlet Cb at the upper wall. Are provided on the opposite side of the inlet Ca of the cooling water, and the outlet Cd is provided on the same side.

On the other hand, the multi-plate type cooling element E has been made of a stainless steel plate until now, but recently, it has been made of aluminum in order to reduce the weight and cost of the vehicle, and the flat shape of the cooling element E has been increased. A downward plate-like first plate 1 and an upward plate-like second plate 2 similar to the body C
And a perforated fin plate 3 disposed between the two.
The first and second plates 1 and 2 have a thickness of 0.5
Or 0.7 mm aluminum core (for example, Al-
Mn-based alloy, JIS. 3003) is coated with a brazing material layer (for example, an Al-Si alloy, JIS. 4045, 4343) having a thickness of about 0.1 to 0.2 mm on one surface (the surface in contact with oil) and the other surface (in contact with cooling water). The surface has a thickness of 0.1 to 0.2 mm in consideration of corrosion prevention and joining with other members.
Degree of sacrificial corrosive material layer (for example, Al-Zn alloy, JI
S. 7072) and the brazing material layer is applied thereon to form an aluminum cladding material, and the fin plate 3 is a cladding material in which a brazing material is applied to both surfaces of the aluminum plate.

[0005] The first plate 1 is provided with an upward pipe portion 1a aligned with an oil inlet Cb or an outlet Cd of the cover body C on both sides in the longitudinal direction, and has an upward hook-like brim portion 1b around the periphery thereof. Has a large number of press-maintenance projections 1c on the upper surface thereof.
Is provided with a downward pipe portion 2a at both ends in the longitudinal direction except for the lowermost one, and a downward hook-like flange portion 2 around the periphery.
b, and a plurality of protrusions 2c for maintaining the interval on the lower surface. The fin plate 3 has a perforated hole on the side surface of each folded piece, and circular window holes at both ends in the longitudinal direction, which are aligned with the oil inlet and outlet Cb and Cd of the cover body.

The first plate 1 and the second plate 2 face each other with a fin plate 3 interposed therebetween to form a heat exchange unit plate member.
The upward pipe portion 1a of the first plate 1 of the lower unit plate member is inserted into the downward pipe portion 2a of the plate 2,
Aluminum (for example, Al-Mn alloy, J
IS. 3003), and a plurality of layers are laminated while the peripheral flanges 1b and 2b abut against each other back to back, and the upward pipe section 1 of the uppermost first plate 1 is stacked.
a is aluminum (for example, an Al—Mn alloy, JI
S.3003) The central through-hole 5a of the thick diamond-shaped cover body connecting flange 5 is fitted, and both ends of the lower surface of the lowermost second plate 2 are provided with the same aluminum reinforcing plate 6 ( (Thickness 3 to 5 mm), all of which are brazed in a furnace to form a cooling element E.

The cooling element E as described above is accommodated in the cover C, and a sealing gasket 8 is interposed on the flanges 5 at both ends, and the central through hole 5a is aligned with the oil inlet Cb or the outlet Cd. While being in contact with the inner surface of the upper wall of the cover body C, iron bolts 7 are screwed into a pair of screw holes of each flange 5 and assembled to the cover body C, and a cooling water guide is attached to the open end of the cover body C. For the oil cooler Oc
The oil cooler Oc is mounted on the wall of the engine block B by bolts 7 with the gasket 8 interposed at a plurality of places around the cover body at the flange portion Cf.

At the time of use, the oil sucked up from the oil pan is supplied to the inlet Cb of the cover C as indicated by a dotted arrow.
While flowing into each unit plate member of the element E, cooling water on the radiator side is introduced from the intake Ca on the opposite side as shown by the solid line arrow, flows through the gap between the unit plate members and the surrounding portion, and becomes oil. The cooled oil is sent from the outlet Cd to the sliding portion and bearing portion of the engine, and the cooling water flows out of the outlet 9a provided on the opposite side of the partition plate 9 to the water jacket Ba. It flows around the cylinder.

[0009]

In the case of an engine mounted on a large vehicle such as a truck or an industrial vehicle, a large flow rate of 400 l / min or 500 l / min of cooling water flows into the oil cooler Oc during operation. However, in the above-described conventional oil cooler, there is a gap between the joining flanges 1b and 2b of each unit plate member and the side wall of the cover body C as shown in FIG. The cooling water that has flowed into the C body flows more vigorously on the side surfaces of the joining flanges 1b and 2b on both sides of the laminated plate member in FIG. 5 than flowing between the unit plate members. It is easy to cause corrosion on the outer periphery,
Further, the side surface portion is not a portion directly useful for heat exchange with the oil, and the cooling water is not sufficiently used for cooling the oil.

Therefore, the present invention suppresses the flow of cooling water toward the side surface of the laminated plate member of the cooling element,
An object of the present invention is to prevent the occurrence of corrosion of the outer peripheral portion of a joining flange portion and to make it possible to effectively use cooling water for heat exchange with oil.

[0011]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides an upwardly hooked brim made of aluminum clad material, having upwardly directed pipe portions at both ends and a horizontal piece and an upright piece at the peripheral portion. A downward plate-shaped first plate having a downward portion, and a downward pipe portion fitted to the upward pipe at both ends, and a peripheral portion having a downward hook-shaped flange portion composed of a horizontal piece and an upright piece are provided. A unit plate member is formed by interposing a perforated fin plate between the second plate and the unit plate member, and the unit plate members are stacked in a plurality of stages with an aluminum spacing ring interposed therebetween. Aluminum block-shaped flanges are attached to both ends to form cooling elements, and a cap-shaped cover made of aluminum casting is attached to the cooling element. As a cooler, a horizontal piece of a brim portion along each longitudinal side of each of the first and second plates of the cooling element extends outward over substantially the entire length to bring each upright piece at the outer end close to an inner surface of a side wall of the cover body. An upright piece of the upper second plate and a lower upright piece of the first plate are brought close to each other to form a closed cooling water passage between the unit plate members.

[0012]

FIG. 1 shows a partially cut-away side view of an example of an oil cooler according to the present invention, FIG. 2 shows a cross section along the line XX, and FIG. 3 shows a unit plate member described later. The cover body C is made of an aluminum casting having a thickness of about 5 to 10 mm so as to withstand corrosion similarly to the above, and has a flat rectangular or elliptical hat shape, and is provided around the lower open end. A cooling water intake port Ca is provided on one end wall, and an oil inlet Cb is provided on the opposite side of the upper wall, and an outlet Ca is provided on the same side.

The cooling element E housed in the cover C is a multi-plate type having the same planar shape as the cover, and has a first plate 11 having a downward dish shape, a second plate 12 having an upward dish shape, and both plates. And a first and second plate 1 comprising a perforated fin plate 13 disposed between
Reference numerals 1 and 12 denote a brazing material layer having a thickness of about 0.1 to 0.2 mm on one surface (a surface in contact with oil) of an aluminum core plate (for example, an Al-Mn alloy, JIS.3003) having a thickness of about 0.5 to 0.7 mm. For example, Al-Si based alloy, JIS.40
45, 4343) and a sacrificial corrosive material layer (for example, Al) having a thickness of about 0.1 to 0.2 mm on the other surface (the surface in contact with the cooling water) in consideration of corrosion prevention and joining with other members. −
Zn-based alloy, JIS. 7072) and the brazing material layer is adhered thereon to form an aluminum cladding material having a thickness of about 0.8 to 1 mm. The fin plate 13 has the brazing material layer adhered to both surfaces of the aluminum core plate. Being
It is made of an aluminum clad material having a thickness of about 0.7 to 0.9 mm.

The first plate 11 having a downward dish shape is provided at the center of both ends in the longitudinal direction with an oil inlet Cb or an outlet Cb of the cover body C.
d, and a peripheral portion thereof has an upwardly hooked collar portion 11b composed of a horizontal piece 11h and an outer upright piece 11v, but as shown in FIG. 2 and FIG. In the range between the centers of the upwardly directed pipes 11a at both ends in the longitudinal direction, the horizontal portions 11h of the brim portions 11b of the both sides along the horizontal axis 11h correspond to the upright pieces 11v of the cover body C when the plate 11 is accommodated in the cover body C. It extends outwardly from the end so as to be close to the inner surface of the side wall, and the upright piece 11h faces the first and second plates 11, 12 and is approximately half the distance between the upper and lower ones when laminated. It protrudes upward to the height. Except for the uppermost one, a number of protrusions 11c are provided on the upper surface for maintaining the interval by press working.

The upward plate-shaped second plate 12 has a downward pipe portion 12a fitted to the upward pipe portion 11a of the first plate 11 at the center of both ends in the longitudinal direction. It has a downward hook-shaped flange portion 12b consisting of an upright piece 12v at the end, but like the first plate 11, the flange portions 12b on both sides along the longitudinal direction are in a range between the centers of the downward pipe portions 12a at both longitudinal ends. In the horizontal portion 12h, when the plate 12 is accommodated in the cover body C, the upright piece 12v extends outwardly from the end so as to be close to the inner surface of the side wall of the cover body C.
1h projects downward so that when the first and second plates 11 and 12 face each other and are stacked, they are almost half the height of the space between the upper and lower ones. Except for the lowermost one, a large number of protrusions 12c for maintaining the interval are provided on the lower surface.

The fin plate 13 has a large number of through holes on the side surfaces of each fold, as shown by the dashed line in FIG. 3, and has pipe portions 11a, 12a of the first and second plates at both ends in the longitudinal direction. And a window hole 13a aligned with the oil inlet and outlet Cb, Cd.

Reference numeral 15 in FIGS. 1 and 2 denotes a flange for connecting the cover, which is made of aluminum (for example, an Al-Mn alloy, JIS.3003) and has a rhombic block shape with a thickness of about 10 mm. A central through-hole 15a aligned with the oil inlet Cb or outlet Cd is provided, and as shown in FIG. 2, galvanized iron bolts 17 are fitted on both sides in a penetrating state with the head down and on the lower surface. A seal plate 19 clad with the brazing material is attached to both sides. However, the seal plate 19 may not be used when the flange 15 is provided so as not to protrude from the plate 11 as shown in the figure.

Therefore, the first plate 11 and the second plate 12 face each other with the fin plate 13 interposed therebetween to form a unit plate member for heat exchange as shown in FIG. The first plate 1 of the lower unit plate member on the downward pipe portion of the plate 12
1, the upper pipe portion 11a is fitted therein, and the same aluminum spacing ring 14 as the flange 15 is fitted on the outer side thereof, and a plurality of layers are laminated while the peripheral flange portions 11b and 12b are abutted back to back. Second plate 1
A reinforcing plate 16 made of the same aluminum is attached to both end portions of the lower surface of the second plate 2. A center through hole 15a is fitted to each upward pipe portion 11a at each end portion of the uppermost first plate 11, and a flange 17 with a bolt 17 is provided. 15 are arranged respectively, and they are all brazed in a furnace to form the cooling element E.

The cooling element E as described above is accommodated in a cover body C after a non-metallic gasket 18 for sealing is provided on each flange 15, and its central through hole 15a is fitted to an oil inlet Cb or an oil outlet Cd. With each bolt 17
Are inserted into the bolt insertion holes of the cover C, respectively, are brought into contact with the inner surface of the upper wall of the cover C, and the nuts 20 are screwed into the protruding portions of the bolts 17, respectively, and are integrally assembled to the cover C ( By adopting such a coupling means, it is possible to tighten the screws firmly without crushing the screws, as compared with the conventional method in which screws are screwed into the aluminum flange from above). A guide plate 19 made of stainless steel plate is screwed to form an oil cooler Oc. The oil cooler Oc has a gasket 18 at a plurality of flange portions Cf around the cover body.
It is attached to the wall surface of the engine block B by bolts 17 with the intervention.

At this time, as shown in FIG.
The upright pieces 11h, 12h of the brim portions 11b, 12b on both sides of each unit plate member are close to the inner surface of the side wall of the cover C, and the downward upright pieces 12v of the second plate of the upper unit plate member and the lower unit plate The upright pieces 11v of the first plate 11 of the member are close to each other, and the gaps between the unit plate members, that is, the sides of the cooling water passages, are the upright pieces 11v of the flange portions 11b and 12b of the first and second plates. 1
It is closed by 2v.

During use, the oil sucked up from the oil pan flows into each unit plate member of the cooling element E from the inlet Cb of the cover C as shown by a dotted arrow in FIG. 1, while the cooling water on the radiator side is discharged. It flows into the cover body C as indicated by the solid arrow from the intake Ca on the opposite side,
As shown in FIG. 2, both sides of the gap are close to the side wall of the cover C between the unit plate members, as shown in FIG. Upright piece 1 of each brim portion 11b, 12b
Since the channels are closed by 1v and 12v, the flow of the cooling water to the outside of the flange portions 11b and 12b is suppressed, and a large amount of the cooling water flows in the gap.
The heat exchange with the oil is effectively performed, and each flange 11b,
Corrosion of the outer peripheral portion of 12b is prevented. Then, the cooled oil is sent from an outlet Cd to a sliding portion or a bearing portion of the engine, and the cooling water is supplied to an outlet 1 provided on a partition plate 19.
From 9a, it flows to the water jacket 13a.

In the illustrated example, the first and second plates 1
Horizontal pieces 11h, 12 of flanges 11b, 12b of 1, 12
Although the range in which the h and the upright pieces are extended and raised is set between the centers of the pipe portions 11a and 12a at both ends, the range is not limited to this, and may be any range that extends over substantially the entire length of each of the plates 11 and 12. Further, the partition plate 19 is for convenience of guiding the flow of the cooling water, and may be omitted.

[0023]

Since the present invention is configured as described above as an aluminum multi-plate oil cooler for a vehicle, it suppresses the flow of the cooling water flowing into the cover toward the outside of the cooling element during use. As a result, a larger amount of cooling water can flow through the gaps between the unit plates than before, thereby facilitating the heat exchange work with oil and preventing the occurrence of corrosion on the outer periphery of each plate flange. Can be.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view of an example of an oil cooler according to the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIG. 3 is a perspective view of a unit plate member.

FIG. 4 is a partially cut-away side view of a conventional oil cooler.

FIG. 5 is a transverse sectional view taken along line YY of FIG. 4;

[Explanation of symbols]

 C Cover body E Cooling element Oc Oil cooler 11 First plate 11a Upward pipe section 11b Collar section 11h Horizontal piece 11v Upright piece 12 Second plate 12a Downward pipe section 12b Collar section 12h Horizontal piece 12v Upright piece 13 Fill plate 14 Spacing ring 15 Flange

Claims (1)

[Claims] 1. A downward plate-shaped first plate made of an aluminum clad material, having upwardly directed pipe portions at both ends and an upwardly hooked flange formed of a horizontal piece and an upright piece at the peripheral portion, and both end portions. A perforated fin plate is interposed between a perforated second plate having a downwardly hooked brim portion formed of a horizontal piece and an upright piece in a peripheral portion thereof. Then, a unit plate member is formed, and the unit plate members are stacked in a plurality of stages with an aluminum spacing ring interposed therebetween, and aluminum block-shaped flanges are attached to both ends of the uppermost first plate for cooling. An oil cooler in which a cap-shaped cover made of an aluminum casting is attached to the cooling element. The horizontal pieces of the brim portion along both sides in the longitudinal direction of the plate are extended outward over substantially the entire length so that each of the upright pieces at the outer end is close to the inner surface of the side wall of the cover body, and the upright pieces of the upper second plate and the lower first piece are provided. An oil cooler for a vehicle, wherein upright pieces of plates are brought close to each other to form a closed cooling water passage between each unit plate member.