JP4352424B2 - Oil cooler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a compact oil cooler in which a filter can be installed inside a core of an oil cooler.
[0002]
[Prior art]
There has been proposed an oil cooler in which an oil filter is housed in a central space of a ring-shaped core for cooling engine oil (see, for example, Patent Document 1).
The core of this oil cooler has a large number of tubes communicating between a pair of upper and lower annular headers, fins are interposed on the outer periphery of the tubes, and a cylinder is fitted on the inner and outer periphery of the header. And while circulating cooling water in a header and each tube, after circulating oil to the outer periphery of the tube and cooling it with cooling water, it distribute | circulates from the radial direction outer side of an oil filter toward the center. .
[0003]
In addition, as another example of the oil cooler, circular plate-shaped plates are stacked in multiple stages, and water and oil are alternately circulated alternately, and after cooling the oil, it is guided to the oil filter. Things have also been proposed.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-323007 (FIGS. 1, 3, and 7)
[0005]
[Problems to be solved by the invention]
A conventional oil cooler that stores oil filters concentrically and inside has a large number of tubes or plates in its core, and its connecting portions are joined by brazing or the like. Therefore, since the number of parts is large and the brazing part is large, there is a risk of water leakage from the brazing part. In this case, cooling water is mixed into the oil. Further, the conventional oil cooler has a disadvantage that the structure is complicated and the cost is high.
Therefore, an object of the present invention is to provide a highly reliable oil cooler having a small number of parts and no leakage.
[0006]
[Means for Solving the Problems]
The present invention as set forth in claim 1 includes a bottomed cylindrical casing (4) in which an oil inlet (2) and an oil outlet (3) are opened at a center portion of the bottom portion (1) and at a position away from the center portion.
An upper lid (5) for detachably closing the upper end opening of the casing (4);
The flat tube (6) is continuously bent in the major axis direction of the cross section, and a gap is formed between the opposing planes to form a cylindrical spiral as a whole, and the fin (7) is interposed in the gap. A fixed core (8),
The core (8) is housed in the casing (4), both ends of the flat tube (6) are led out of the casing (4), and each is connected to a cooling water supply path,
On the outer surface of the flat tube (6) and on the fin (7) side, oil (9) flowing in and out from the oil inlet (2) and oil outlet (3) of the bottom (1) extends in the radial direction of the core (8). Configured to circulate,
The oil filter (10) is accommodated coaxially inside the core (8) so as to be detachable from the axial direction,
The peripheral edge of the bottom (1) of the casing (4) has a plurality of oil inlets (2) arranged annularly at regular intervals in the circumferential direction, and the oil outlet (3) is opened at the center. ,
A lower end contact surface (12) of the core (8) is formed at the bottom (1) between the plurality of oil inlets (2) and the oil outlet (3), and the contact surface (12) When the lower surface of the core (8) is brought into contact with the lower end contact surface (12) of the flat tube (6), the core (8) and the contact surface (12) are aligned. It is formed so that there is no gap between them, and oil does not flow from there,
It is an oil cooler comprised so that the front-end | tip of the flat tube may guide | penetrate and penetrate the outer peripheral surface of a casing (4) .
[0009]
The present invention according to claim 2 is the method according to claim 1 ,
Both ends of the flat tube (6) of the core (8) penetrate the outer periphery of the casing (4), and an inlet pipe (13b) and an outlet pipe (13a) are connected to the respective ends. It is an oil cooler connected to the cooling water inlet / outlet.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an oil cooler according to the present invention, and FIG. 2 is an explanatory view showing a use state thereof. FIG. 3 shows an example of the manufacturing process of the core 8 of the oil cooler of the present invention.
In this oil cooler, as shown in FIG. 1, a casing 4 includes a bottom portion 1, a main body 4 a, and a locking ring 16. The core 8 accommodated in the casing 4 includes a spiral flat tube 6 and fins 7, and both ends of the flat tube 6 penetrate the casing 4. The upper lid 5 is detachably closed at the upper end opening of the casing 4. The oil filter 10 can be removably inserted into the core 8.
[0011]
The core 8 is formed by bending the flat tube 6 continuously in the major axis direction of the cross section, leaving a gap between the opposing planes, and forming the whole in a cylindrical spiral shape. The corrugated fins 7 are interposed and fixed in the gaps between the flat opposing planes in the spiral portion of the flat tube. Further, both end portions of the flat tube 6 are drawn out to the outside of the cylinder.
In order to manufacture such a core 8, as shown in FIG. 3, as an example, the flat tube 6 is fed out from a tube coil 26 wound in a coil shape, and the corrugated type is fed out from a fin molding machine 25 on the plane. The fins 7 are overlapped. Next, the flat tube 6 is continuously plastically deformed in a spiral shape by a molding machine (not shown) in the longitudinal direction of the cross section, and the flat tube 6 and the fins 7 are cut to an appropriate length to assemble the core.
[0012]
Further, the outer surface of the flat tube 6 or the outer surface of the fin 7 is coated with a brazing material.
The fin 7 may be a multi-entry type offset fin instead of the corrugated type. This fin has a wave ridge that meanders and a large number of cuts raised on the rising surface.
Furthermore, the wave shape may be a rectangular wave or a sine curve.
The flat tube 6 may be an extruded multi-hole tube having a number of partitions inside, or a normal tube without the partitions.
[0013]
And the flat tube 6 and the fin 7 are formed in the donut shape where the planar outer periphery is circular. In addition, the flat surfaces of the flat tubes 6 are formed so as to face each other with a certain distance therebetween in the vertical direction, and the fins 7 that are continuous in the gaps are arranged in a spiral shape. The gap between the flat surfaces of the flat tube 6 matches the amplitude height of the fins 7.
The core 8 thus formed is housed in the main body 4a in FIG. Next, the lower end of the main body 4 a housing the core 8 is fitted to the bottom portion 1. And while making the lower end of the flat tube 6 protrude from the notch part 23 of the bottom part 1, the upper end of the flat tube 6 is protruded from the notch part 23 of the main body 4a. Next, the locking ring 16 is fitted to the upper end of the main body 4a.
[0014]
Further, an inlet pipe 13b is fitted to the upper end of the flat tube 6 and an outlet pipe 13a is fitted to the lower end.
The thus-assembled casing 8 with the core 8 is inserted into a high-temperature furnace, and the brazing material previously coated or placed thereon is melted, and then integrally formed by cooling and solidifying it.
The bottom portion 1 has an oil outlet 3 in the center, and a large number of oil inlets 2 are formed at regular intervals in the circumferential direction on the periphery. In addition, a contact surface 12 having a spiral inclination is formed between the oil inlet 2 and the oil outlet 3, and the contact surface 12 and the spiral inclination of the flat tube 6 on the lower end surface of the core 8 are aligned.
[0015]
Next, the oil cooler is attached to the outer surface of the engine 14 by the following procedure as an example. First, the flange 15 constituting the seat portion is fastened to the upper surface of the engine 14 via a fastener. At this time, the seal ring 17 is interposed between the oil outlet 18, the oil inlet 19, the water inlet 20, and the water outlet 21 of the engine 14 and the flange 15, respectively.
In addition, the bottom 1 and the flange 15 can be fastened and fixed in advance with an appropriate fastening metal via a packing. The fastening of both can also be performed after the flange 15 is attached to the engine 14.
The inlet pipe 13b and the outlet pipe 13a are fitted to the flange 15 and the inlet port 20 and the water outlet 21 of the engine 14 through seal rings (not shown).
[0016]
Next, the oil filter 10 is inserted in the axial direction from the opening of the casing 4. At this time, the lower end of the oil filter 10 is seated liquid tightly on the hole edge of the oil outlet 3 in the bottom 1 through the packing 27. Next, the upper lid 5 may be screwed and fastened to the locking ring 16 at the upper end of the casing 4 through a sealing O-ring. A spring 29 and a relief valve (not shown) are interposed between the lower surface of the center portion of the upper lid 5 and the center of the oil filter 10. In this case, when the oil filter 10 is clogged, the spring 29 is pushed up to open the relief valve and bypass the oil.
[0017]
Then, as shown in FIG. 2, the oil 9 is introduced from the oil inlet 19 of the engine 14 and flows from the outer periphery of the core 8 to the center side through the oil inlet 2 of the casing 4. At the same time, the cooling water 11 is spirally circulated in the flat tube of the core 8 from its upper end to its lower end. Then, the oil 9 is cooled, and the cooled oil 9 flows through the oil filter 10 from the radially outer side to the inner side and is filtered, and it returns to the engine through the oil outlet 18.
[0018]
Next, FIG. 4 is a schematic perspective view showing another embodiment of the core 8 of the present invention.
In this example, the flat tubes 6 are arranged in two rows on the inner side and the outer side, are formed in a spiral shape in alignment with each other, and one fin 7 is continuously interposed between them. In this example, the upper ends of the pair of flat tubes 6 and 6 are communicated with each other by a communicating body 28, and the respective lower ends are led to the outside of the casing. Then, the cooling water 11 is circulated from one flat tube 6 and flows out from the other flat tube 6. Other structures are formed in the same manner as those in FIG.
In the example of FIG. 4, there is only one through portion for leading the flat tube 6 from the casing, and the structure for taking out the flat tube 6 to the outside can be further simplified.
[0019]
Next, FIG. 5 is an example of another oil cooler using the core of FIG. In this example, the cooling water 11 is circulated in parallel with the pair of flat tubes 6, 6. For this purpose, the oil inlet and one end of the pair of flat tubes 6, 6 are connected by an inlet header 30. The outlet header 31 connects the oil outlet and the other ends of the pair of flat tubes 6 and 6.
[0020]
[Operation and effect of the invention]
In the oil cooler of the present invention, a core 8 is accommodated in a bottomed casing 4 and an oil filter 10 is detachably accommodated coaxially inside the casing 8. The core 8 is formed by bending the flat tube 6 continuously in the major axis direction of the cross section into a spiral shape and interposing fins 7 on the opposing plane.
Therefore, there is almost no possibility that the core 8 will leak in the casing 4, and a highly reliable oil cooler can be obtained. This is because the flat tube 6 constituting the core 8 is continuously bent and spiraled, so that it is brazed in the circulating portion of the cooling water as compared with the conventional type in which a large number of plates are stacked. There are almost no parts and there is no risk of leakage of cooling water.
In addition, it is possible to provide an oil cooler with an oil filter that is mass-productive, compact and efficient.
[0021]
Further, since a plurality of oil inlets 2 are opened at regular intervals in the circumferential direction at the periphery of the bottom 1 of the casing 4 and the oil outlet 3 is opened at the center, the oil to be cooled is supplied from the outer periphery of the core 8. It is possible to smoothly circulate toward the inner periphery and reduce the pressure loss associated with the circulation. Then, the oil can be circulated through the oil filter 10 and guided from the center to the oil outlet 3.
[0022]
In addition, since the contact surface 12 of the bottom 1 of the casing 4 is aligned with the spiral shape of one round of the lower surface of the core 8, there is no gap between the core 8 and the bottom 1, and oil is uniformly distributed to each part of the core 8 from its outer periphery. Can lead to.
[0023]
In the above configuration, both ends of the flat tube 6 of the core 8 can be passed through the outer periphery of the casing 4, and the inlet pipe 13b and the outlet pipe 13a can be connected to the respective ends. By doing in this way, the flow path of a cooling water can be made into a simple structure, and it can prevent that a cooling water leaks out in the casing 4. FIG.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an oil cooler according to the present invention.
FIG. 2 is an explanatory view showing a usage state of the oil cooler.
FIG. 3 is an explanatory view showing an example of a manufacturing process of a core 8 used in the oil cooler.
FIG. 4 is a schematic perspective view showing another example of a core 8 used in the oil cooler.
FIG. 5 is a perspective view showing a main part of another example of the oil cooler of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bottom part 2 Oil inlet 3 Oil outlet 4 Casing 4a Main body 5 Top cover 6 Flat tube 7 Fin 8 Core 9 Oil
10 Oil filter
11 Cooling water
12 Contact surface
13b Inlet pipe
13a Outlet pipe
14 engine
15 Flange
16 Lock ring
17 Seal ring
18 Oil outlet
19 Oil inlet
20 Water inlet
21 Water outlet
22 Mounting bolt hole
23 Notch
24 Spiral strip
25 Fin molding machine
26 Tube coil
27 Packing
28 communication
29 Spring
30 inlet header
31 Exit header

Claims (2)

A bottomed cylindrical casing (4) in which an oil inlet (2) and an oil outlet (3) are opened at a center portion of the bottom portion (1) and at a position away from the center portion;
An upper lid (5) for detachably closing the upper end opening of the casing (4);
The flat tube (6) is continuously bent in the major axis direction of the cross section, and a gap is formed between the opposing planes to form a cylindrical spiral as a whole, and the fin (7) is interposed in the gap. A fixed core (8),
The core (8) is housed in the casing (4), both ends of the flat tube (6) are led out of the casing (4), and each is connected to a cooling water supply path,
On the outer surface of the flat tube (6) and on the fin (7) side, oil (9) flowing in and out from the oil inlet (2) and oil outlet (3) of the bottom (1) extends in the radial direction of the core (8). Configured to circulate,
The oil filter (10) is accommodated coaxially inside the core (8) so as to be detachable from the axial direction,
The peripheral edge of the bottom (1) of the casing (4) has a plurality of oil inlets (2) arranged annularly at regular intervals in the circumferential direction, and the oil outlet (3) is opened at the center. ,
A lower end contact surface (12) of the core (8) is formed at the bottom (1) between the plurality of oil inlets (2) and the oil outlet (3), and the contact surface (12) When the lower surface of the core (8) is brought into contact with the lower end contact surface (12) of the flat tube (6), the core (8) and the contact surface (12) are aligned. It is formed so that there is no gap between them, and oil does not flow from there,
An oil cooler configured such that the tip of the flat tube is guided through the outer peripheral surface of the casing (4) . In claim 1 ,
Both ends of the flat tube (6) of the core (8) penetrate the outer periphery of the casing (4), and an inlet pipe (13b) and an outlet pipe (13a) are connected to the respective ends. Oil cooler communicated with the cooling water inlet / outlet.

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