JPH08210117A - Heat exchanger for oil cooler - Google Patents

Abstract

PURPOSE: To reduce thickness and weight of a heat exchanger by laminating metal plates on which oil passage ports and cooling water passage ports are formed, soldering them to form an oil cooler, and thereby dispensing with an oil piping. CONSTITUTION: Four intermediate plates 20 are laminated with alternately inversed Lamination directions. An oil passage 4 is formed sequentially of, oil inlet ports 24, 24A of the intermediate plate 20, oil passages ports 27, 27, oil inlet ports 24A, 24, oil passage ports 28, 29, oil outlet ports 25, 25A, the oil passage ports 27, 27, and the oil outlet sports 25A, 25. Four cooling water passages are formed by cooling water passage ports on upper and lower plates and cooling water passage ports on the intermediate plate 20. Oil and cooling water circulate through oil passages 3, 4 and the cooling water passage.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, small-sized two-wheeled vehicles for running on rough terrain have been increasingly equipped with a water-cooled four-cycle engine. These vehicles also employ an oil cooler in order to prevent the oil temperature from rising during traveling, and most of them are air-cooled ones having a large number of heat radiation fins having a shape as shown in FIG.

[0003]

However, in the air-cooled oil cooler, mud is likely to be clogged in the air passage of the oil cooler during traveling on rough terrain, and the cooling performance is likely to be deteriorated. For this reason, it is desirable to use a water-cooled oil cooler.However, in such motorcycles, the crankcase and the like are made smaller in order to reduce the weight, and the water-cooled oil cooler used in large motorcycles and the like is used. There is a problem that it is difficult to secure a space such as a location for arranging the cooling water pipes in order to mount the device as it is.

An object of the present invention is to provide a water-cooled oil cooler which is small and lightweight and which can improve the cooling effect.

[0005]

SUMMARY OF THE INVENTION The present invention is a heat exchanger for an oil cooler airtightly arranged between a crankcase and a cylinder block of an engine, the cooling water passage of the crankcase or the cylinder block. Between two upper and lower metal plates formed with a cooling water opening for communicating with the cooling water passage and an oil opening for communicating between the oil passage of the crankcase or the oil passage of the cylinder block In, a plurality of intermediate metal plates having a cooling water hole communicating with the cooling water opening, an oil hole communicating with the oil opening and an oil groove hole are stacked, and the oil groove hole is formed. Ends of the upper and lower metal plates or the intermediate metal plates stacked on both sides of the intermediate metal plate are connected to the ends of the oil groove holes or the oil openings, respectively. Arranged to be a technical means that are brazed.

[0006]

In the present invention, both ends of the oil groove hole of each intermediate metal plate communicate with the oil openings of the upper and lower metal plates or the oil groove holes of the intermediate metal plate laminated on both sides of the intermediate metal plate. Therefore, the oil sent out from the oil passage of the crankcase passes through the oil openings of the stacked upper and lower metal plates in order from the end of the oil groove hole of each intermediate metal plate to the other end. And sent to the oil passage of the cylinder block. Further, in each metal plate, the cooling water opening or the cooling water hole is formed by connecting the cooling water passage of the crankcase and the cooling water passage of the cylinder block, so that the engine cooling water is It moves from the cooling water passage of the crankcase to the cylinder block through the cooling water hole of each metal plate. Therefore, in the heat exchanger in which the metal plates are stacked and brazed, the engine cooling water passing through cools the oil.

[0007]

According to the present invention, the heat exchanger for the oil cooler is airtightly arranged between the crankcase and the cylinder block, and cools each metal plate communicating with each cooling water passage of the crankcase and the cylinder block. Since the cooling water passage is formed by the water opening and the cooling water hole, and the oil passage is formed by the oil opening and the oil groove hole that communicate with the oil passages of the crankcase and the cylinder block. There is no need for piping to supply oil and cooling water to the heat exchanger for the oil cooler. Therefore, it is possible to provide a thin and lightweight oil cooler that does not require oil pipes or cooling water pipes. Further, since the oil groove hole of each intermediate metal plate communicates with other stacked metal plates, an oil passage having a sufficient length is formed so as to cross the heat exchanger,
The heat exchanger can sufficiently radiate the oil.

[0008]

[Embodiment] Next, an embodiment in which the present invention is applied to an all-terrain motorcycle will be described. In FIG. 1, 1 is an oil cooler showing an embodiment of the present invention, 100 is a crankcase of a running engine for an off-road vehicle on which the oil cooler 1 is mounted, and 200 is a cylinder. The oil cooler 1 is one in which two upper and lower plates 10 and four intermediate plates 20 arranged between the upper and lower plates 10 are integrated by brazing or the like.

As shown in FIG. 2, a large circular connecting rod hole 11 is formed in a substantially rectangular upper and lower plate 10, and four groove-like grooves having an arc shape are formed around the connecting rod hole 11. A cooling water passage hole 12 is formed. Near the corners of the upper and lower plates 10 outside the cooling water passage holes 12, small circular cylinder tightening bolt holes 13 are provided at two diagonal positions, and on another diagonal line intersecting the direction of the cylinder tightening bolt holes 13. Has a small circular oil inlet hole 14 which also serves as a similar cylinder tightening bolt hole, and an oil outlet hole 15 respectively. In addition, the upper and lower plates 10 also have an elongated cam chain hole 16,
Two cylinder tightening bolt holes 17 are formed.

As shown in FIG. 3, the intermediate plate 20 also has connecting rod holes at positions corresponding to the connecting rod holes 11, cooling water passage holes 12, cam chain holes 16, and cylinder tightening bolt holes 17 of the upper and lower plates 10, respectively. Two
1, a cooling water passage hole 22, a cam chain hole 26, and a cylinder tightening bolt hole 23 are formed.

Further, in the intermediate plate 20, two kinds of oil are used at the positions corresponding to the cylinder tightening bolt holes 13, the oil inlet hole 14 and the oil outlet hole 15 of the upper and lower plates 10, all of which also serve as cylinder tightening bolt holes. Inlet holes 24, 24A and oil outlet holes 25, 2
5A is formed.

The oil inlet hole 24 and the oil outlet hole 25 formed on one side of the intermediate plate 20 have a hole shape which is smaller than that of the cylinder tightening bolt hole 13, the oil inlet hole 14, the oil outlet hole 15, etc. of the upper and lower plates 10, respectively. It has thick arcuate portions 24a, 25a that are enlarged inward toward the outside of the connecting rod hole 21. On the other hand, the oil inlet hole 24A and the oil outlet hole 25A formed on the other side of the intermediate plate 20 have arcuate portions 24b and 25b similarly to the oil inlet hole 24 and the oil outlet hole 25. A groove portion 24 extended from each arcuate portion 24b, 25b so as to sandwich the cooling water passage hole 22 in the circumferential direction.
c, 25c.

Between the oil inlet hole 24 and the oil inlet hole 24A and between the oil outlet hole 25 and the oil outlet hole 25A, two cooling water passage holes 22 are provided on both sides of the extension of the groove portions 24c, 25c. A groove-shaped oil passage hole 27 is formed. Each oil passage hole 27 is shown in FIG.
When the dashed-dotted line M is centered, the length from the dashed-dotted line M is different, and the oil inlet hole 24 and the oil outlet hole 25 sides are longer than the oil inlet hole 24A and the oil outlet hole 25A sides.

Between the oil inlet hole 24 and the oil outlet hole 25, there are four groove-shaped oil passage holes 28 which are separated into two at the intermediate portion so as to sandwich the cooling water passage hole 22.
Are formed. Between the oil inlet hole 24A and the oil outlet hole 25A, two groove-shaped oil passage holes 29 are formed on the extension of the groove portions 24c, 25c so as to sandwich the cooling water passage hole 22. In addition, 20A is a protrusion for confirming the stacking direction of the intermediate plate 20.

Intermediate plate 20 in which the above holes are formed
When stacked as the oil cooler 1, the stacking direction is inverted with respect to the alternate long and short dash line M as a center for each sheet. As a result, as shown in FIG.
The four cooling water passages 12 and the cooling water passage holes 22 of the intermediate plate 20 form four cooling water passages 2.

On the other hand, the oil inlet hole 24A when laminated
The groove portion 24c on the oil inlet hole 24 side of the arc-shaped portion 2 of the oil passage hole 27 of the intermediate plate 20 which is inverted and laminated.
It communicates with the end on the 4a side. Similarly, oil outlet hole 25A
The groove portion 25c on the oil outlet hole 25 side of the arc-shaped portion 2 of the oil passage hole 27 of the intermediate plate 20 which is inverted and laminated.
It communicates with the end on the 5a side.

Further, the groove portion 24c and the groove portion 25c of the oil inlet hole 24A and the oil outlet hole 25A, which are close to each other, are disposed outside the oil passage hole 28 of the intermediate plate 20 which is laminated by being inverted (on the oil inlet hole 24 side or The inside of the oil passage hole 28 of the intermediate plate 20 which is inverted and laminated (closer to each other) communicates with the oil passage hole 29 of the original intermediate plate 20. .

Therefore, the brazed oil cooler 1
As shown in FIG. 5, the four intermediate plates 20 allow the oil inlet hole 24 and the oil inlet hole 24A (reverse intermediate plate) → the oil passage hole 27 and the oil passage hole 27 (reverse intermediate plate) → Oil inlet hole 24A
And oil inlet hole 24 (reverse intermediate plate) → oil passage hole 29 and oil passage hole 28 (reverse intermediate plate) → oil outlet hole 25 and oil outlet hole 25A
(Inverted intermediate plate), oil passage 3, oil inlet hole 24 and oil inlet hole 24A (inverted intermediate plate) → oil passage hole 28 and oil passage hole 29
(Reverse intermediate plate) → Oil outlet hole 25 and oil inlet hole 25A (reverse intermediate plate) → Oil passage hole 27 and oil passage hole 27 (reverse intermediate plate) →
An oil passage 4 including an oil outlet hole 25A and an oil outlet hole 25 (reverse intermediate plate) is formed.

Oil cooler 1 constructed as described above
Is the crankcase 100 and cylinder 2 of the engine
However, in the assembly, the gaskets 31 and 32 ensure the airtightness of the cooling water and the oil between the crankcase 100 and the cylinder 200, and the assembly is performed by the bolt (not shown).

In the oil cooler 1, as shown in FIG. 6, when the engine is operated, the oil in the oil pan 51 is sucked by the operation of the oil pump 50, and the oil of the oil cooler 1 is drawn from the oil passage of the crankcase 100. The cylinder 20 is pushed out into the passages 3 and 4.
It is discharged from the cylinder head 201 into the crankcase 100 through the oil passage of 0. On the other hand, the engine cooling water is supplied to the crankcase 1 by the water pump 60.
00 cooling water passage to oil cooler 1 cooling water passage 2
Through the cooling water passage of the cylinder 200 to the radiator 6
It is sent to 1 and repeats circulation. In this way, when the cooling water and the oil pass through the oil cooler 1, the oil is cooled, so that the oil temperature can be lowered.

As described above, according to the present invention, the metal plates having the oil passage holes and the cooling water passage holes are laminated and brazed to form the oil cooler, which is disposed between the crankcase and the cylinder. Therefore, there is no need for cooling water piping or oil piping. Therefore, a thin and lightweight water-cooled oil cooler can be provided, which is suitable for mounting on a two-wheeled vehicle for running on rough terrain. Further, in this embodiment, since the intermediate plate 20 having the same shape is inverted, the number of types of parts can be reduced.

[Brief description of drawings]

FIG. 1 is an assembly diagram of a crankcase and a cylinder showing an example of mounting an oil cooler according to an embodiment of the present invention.

FIG. 2 is a plan view showing upper and lower plates which are parts of the oil cooler of this embodiment.

FIG. 3 is a plan view showing an intermediate plate that is a component of the oil cooler of this embodiment.

FIG. 4 is a partial assembly diagram with a crankcase for showing a flow of cooling water in the oil cooler of the present embodiment.

FIG. 5 is a plan view of a laminated portion of an intermediate plate for explaining the flow of oil in the oil cooler of this embodiment.

FIG. 6 is a schematic diagram showing a lubricating system and a cooling system of the engine for explaining the operation in the present embodiment.

FIG. 7 is a side view showing a conventional air-cooled oil cooler.

[Explanation of symbols]

 1 Oil cooler (heat exchanger for oil cooler) 10 Upper and lower plates (upper and lower metal plates) 12 Cooling water passage holes (cooling water openings) 20 Intermediate plate (intermediate metal plate) 22 Cooling water passage holes (cooling water holes) 24 Oil inlet hole (groove for oil) 24A Oil inlet hole (groove for oil) 25 Oil outlet hole (groove for oil) 25A Oil outlet hole (groove for oil) 27 Oil passage hole (for oil) Groove hole 28 Oil passage hole (groove hole for oil) 29 Oil passage hole (groove hole for oil) 100 Crankcase 200 Cylinder (cylinder block)

Claims (2)

[Claims] 1. A heat exchanger for an oil cooler airtightly arranged between a crankcase and a cylinder block of an engine, for communicating with a cooling water passage of the crankcase or a cooling water passage of the cylinder block. Between the two upper and lower metal plates having an opening for cooling water and an opening for oil for communicating between the oil passage of the crankcase or the oil passage of the cylinder block. A plurality of intermediate metal plates in which a cooling water hole that communicates, an oil hole that communicates with the oil opening, and an oil groove hole are formed are stacked, and both ends of the oil groove hole are the intermediate metal plate. The upper and lower metal plates or the intermediate metal plates laminated on both sides of the plate may be arranged to communicate with the ends of the oil groove holes or the oil openings, respectively. Heat exchanger oil cooler, characterized in that morning was. 2. The heat exchanger for an oil cooler according to claim 1, wherein the engine is a two-wheeled vehicle running engine.