JPH06229690A - Oil cooler - Google Patents

Abstract

PURPOSE:To improve the heat transfer and pressure resistance properties of a round type detachable oil cooler attached on the outer face of an engine block, by a method wherein each of elements which make up a core consists of a pair of disc plates and many protruding threads that intersect each other are formed on the plane faces of the disc plates. CONSTITUTION:A core is a laminate of two or more disc elements 1 which have center holes 10 and are coordinated with each other, and accommodated in a casing 9. The casing 9 has a pair of first liquid entrance-and-exit ports that communicate with liquid entrance-and-exit ports 5 and 6 inside the elements 1 and second liquid entrance-and-exit ports 7 and 8 which communicate with the peripheries of the elements 1. Each element 1 consists of a pair of disc plates 12 which are coordinated with each other, and a group of many protruding threads 15 is formed jigzag on the plane face of the disc plate so that a band-like wave pattern is formed. The many protruding threads 15 of the pair of the disc plates 12 intersect each other and are in contact with each other at the intersections, and the disc plates 12 are jointed together by brazing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a so-called round-shaped oil cooler which is detachably fixed to the outer surface of an engine block and has a cylindrical shape.

[0002]

2. Description of the Related Art An oil cooler having a cylindrical casing whose upper and lower axial ends are closed has a large number of donut-shaped flat elements stacked therein. For each element, a pair of dish-shaped plates are stacked in opposite directions, inner fins are placed inside, outer fins are placed between each element, and oil is circulated in a semicircular shape inside the element. The cooling water was circulated in a semicircular shape on the outer surface side of the.

[0003]

Such a conventional oil cooler requires an outer fin and an inner fin in order to make the whole compact, has a large number of parts, is troublesome to assemble, and lacks mass productivity. was there.
Therefore, the present invention has a small number of parts and high pressure resistance,
The purpose of the present invention is to provide an oil cooler that can uniformly guide the flow of cooling water to the outer surface of each element.

[0004]

In the oil cooler of the present invention, a core 2 is formed by a stack of flat elements 1 each having a circular outer periphery and having a central hole 10 and aligned with each other. And, it has a cylindrical casing 9 that substantially matches the outer circumference of the core 2 and that houses the core 2. The casing 9 has a pair of first fluid inlets / outlets 3 and 4 opened on the outer circumference thereof communicating with the fluid inlet / outlet portions 5 and 6 in the element 1. At the same time, the second fluid inlets / outlets 7, 8 opened on the outer circumference communicate with the outer circumference of the element 1. The both ends in the axial direction are closed. Next, the element 1 has a pair of disc-shaped plates 11 and 12 each of which has a central hole 10 formed therein and which are aligned with each other, and the hole edge portion and the outer peripheral edge of the central hole 10 and the inner and outer peripheral portions in the radial direction. In the partition part 14 extended to, the parts are liquid-tightly brazed together. At the same time, a pair of the fluid inlet / outlet portions 5 and 6 are formed on both sides of the partition portion 14 to form a flow passage having a flat cross section and a flat cross section inside.

Further, except for the joints between the plates 11 and 12, a large number of projections 15 are formed on the plane in a bent shape, and the formation forms a band-shaped wave, and the band is a plane circle. Arranged in an arc. Further, the outer surfaces of the respective elements 1 and 1 and the plates 11 and 12 of which the element 1 is composed have a large number of ridges 15 intersecting each other and contacting each other at the intersections, and the contacting portions are formed. Attached. further,
In the vicinity of the partition 14, the elements 1 and 1
A second fluid bypass prevention portion 30 is formed which is completely brazed and joined in the radial direction, and the pair of second fluid inlet / outlet ports 7,
8 is the second fluid bypass prevention part of the element 1.
They are arranged on both sides in the circumferential direction with respect to 30. Further, it is characterized in that it is opened in the outer peripheral side surface of the casing 9 so as to face the core peripheral side surface.

[0006]

According to the oil cooler of the present invention, as shown in FIGS.
As shown in FIG. 7, the first fluid 28 and the second fluid 29 flow from the fluid inlet / outlet portion 5 in a plane arc shape as indicated by an arrow. Moreover, since the first fluid 28 and the second fluid 29 flow along the ridges 15 of the plates 11 and 12 and also flow zigzag, the flow path length of the compact round oil cooler is reduced. It will be extremely long. At the same time, each fluid is agitated. Moreover, since the plates facing each other are brazed to each other at the intersections of the protrusions 15, the pressure resistance is high.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of the oil cooler of the present invention as viewed from the direction of arrow AA in FIG. FIG. 2 is a transverse cross-sectional view taken along the line BB of FIG. 1, showing the entire flow passage of the first fluid 28. Also, FIG. 3 is shown in FIG.
6 is a transverse cross-sectional view taken along the line C-C of FIG. 4 is a front view of the oil cooler, FIG. 5 is an exploded perspective view of the oil cooler, FIG. 6 is a plan view of the oil cooler, FIG. 7 is a bottom view of the oil cooler, and FIG. 8 is a vertical cross-sectional view showing a usage state. Is. This oil cooler is made of aluminum, and as shown in FIGS. 1 and 5, a pair of plates 11 and 12 are superposed via a C-shaped spacer 25 to form an element, and the element is laminated. The core 2 is configured. Then, the core 2 is installed in the casing 9, and the upper end spacer 21, the oil guide cover 20, and the upper lid 13 are sequentially stacked on the casing 9. Further, the lower lid 26 is arranged on the lower surface of the casing 9 as shown in FIG. 1, and they are screwed and fastened to the outer surface of the engine block 34 (FIG. 8) by the hollow bolts 17.

A pair of plates 1 constituting the element 1
1 and 12 are configured as shown in FIGS. That is,
Each of the plates 11 and 12 is composed of a plate-shaped aluminum plate having a circular outer periphery and a central hole 10, and has a partition portion 14 extending from the outer periphery of each plate 11, 12 to the radial center. The tip of the partition portion 14 surrounds the central hole 10 in a C-shape, and projects as a question mark into the inner surface of each plate as a whole. The inner surface of the partition portion 14 has the same height as the inner surface of the small brazing flange portion formed on the outer peripheral edge of each plate. Then, between the small flange portion and the C-shaped portion of the partition portion 14, a large number of obliquely arranged protrusions 15 are bent and formed on the front surface side and the back surface side. The top of the protrusion 15 on the inner surface side is the same as the inner surface of the partition portion 14. A flat portion 32 (FIG. 5) is formed between the C-shaped portion of the partition portion 14 and the central hole 10, and the height of the outer surface of this flat portion is the same as the height of the outer surface-side top portion of the ridge 15. . A first fluid communication hole 27 is provided between the center hole 10 and the C-shaped portion of the partition portion 14.

At the same time, a flat second fluid bypass prevention portion 30 is provided in a portion surrounded by the radially extending portion of the partition portion 14 and the outer peripheral small flange portion. The second fluid bypass prevention portion 30 has the same height as the height of the C-shaped flat portion 32 of the partition portion 14. Also, the second fluid bypass prevention unit
A fluid inlet / outlet portion 5 is formed at the center of 30. Then, the plate 11 and the plate 12 are formed substantially the same, and by stacking them in opposite directions, the respective outer peripheral edges and the partition portion 14 contact each other, and the ridge 15 is formed.
Intersect each other and their intersections make contact. Then, the C-shaped spacer 25 is arranged in the flat portion 32 of the partition portion 14, and the first fluid communication hole 27 of the C-shaped spacer 25 is aligned with the first fluid communication hole 27 of the flat portion 32. The upper and lower ends of the C-shaped spacer 25 come into contact with the flat portions 32 of the pair of plates 11 and 12. A clad material coated with a brazing material in advance is used for the inner and outer surfaces of these plates.

Then, the element 1 is laminated on the lower lid 26 as shown in FIG. 1, inserted into a high temperature furnace, and integrally brazed and fixed. At the same time, the casing 9 is fitted onto the core 2, and the upper end spacer 21, the oil guide cover 20, and the upper lid 13 are arranged on the casing 9, and their respective contact portions are liquid-tightly joined. At this time, the pair of pipes 18 and 19 projectingly provided on the outer peripheral surface of the casing 9 are positioned and opened on both sides in the circumferential direction of the second fluid bypass prevention portion 30 as shown in FIG. As shown in FIG. 8, the oil cooler constructed in this way is inserted into the annular groove of the lower lid 26 through the O-ring 23 to block the engine block.
It is seated on the outer surface of 34 and is screwed and fastened to the oil inlet 35 of the engine block 34 by the hollow bolt 17. Then, the filter casing 38 that houses the oil filter 37 is screwed and fastened to the upper end screw portion of the hollow bolt 17.

[0011]

In the oil cooler seated on the engine block 34 as described above, the high temperature oil to be cooled as the first fluid 28 from the oil outlet 36 of the engine block 34 is the first fluid of the lower lid 26. It flows in from the inlet / outlet 3, goes up the first fluid communication hole 27 of each element 1 and flows into the upper lid 13.
Then, it flows into the filter casing 38 from the hole 33 of the upper lid 13, it flows into the center side from the outer periphery of the oil filter 37, and flows into the oil guide cover 20 from the upper end of the hollow bolt 17 through the hole 39, Fluid entry / exit part 5 of each element 1
Spill to. Then, the first fluid 28 that has flowed into the fluid inlet / outlet portion 5 circulates in an annular shape as a whole in each element 1 as shown in FIG. Further, more specifically, the first fluid 28 flows along the ridges 15, and the ridges 15 facing each other are arranged in the element so as to intersect each other, so that the first fluid 28 circulates in a zigzag shape inside.

Then, the fluid flows in an annular shape as a whole and corresponds to the opening of the C-shaped spacer 25.
Flows into the central hole 10 of each element 1 from the hollow bolt
It flows into the inside of the hollow bolt 17 from the reflux hole 24 of 17. Then, as shown in FIG. 8, the oil flows back to the oil inlet 35 of the engine block 34. Next, as shown in FIG. 3, the cooling water as the second fluid 29 flows in from one pipe 18, flows as a whole in the clockwise direction opposite to the first fluid 28, and flows out from the other pipe 19. To do. Like the first fluid 28, the second fluid 29 also circulates in a zigzag shape along the ridges 15. And
Effective heat exchange is performed between the second fluid 29 and the first fluid 28.

[0013]

The oil cooler of the present invention is a so-called circular multi-plate type oil cooler in which a large number of projections 15 are bent in the plane of the plates 11 and 12, and the projections form a band-like wave. The band is formed in a plane arc shape. The outer surfaces of the respective elements 1 and 1 and the plates 11 and 12 of which the element 1 is composed have a large number of ridges 15 intersecting each other and contacting at the intersections, and the contacting portions are brazed. Therefore, despite the compact structure, the first fluid 28 and the second fluid 29, which circulate on the inner and outer surfaces of each element 1, both circulate in a substantially annular shape as a whole, and a large number of ridges are formed on each element 1. At 15, the fluid flows along the ridge and flows in a zigzag shape, so that the flow path becomes long and is agitated to improve the heat transfer property. Moreover, since the inner and outer surfaces of each element 1 are brazed to each other at the intersections of the projections 15, the oil cooler has high pressure resistance and high reliability.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an oil cooler of the present invention, viewed from the direction of arrow AA in FIG.

FIG. 2 is a transverse sectional view taken along the line BB of FIG. 1, showing a first fluid.
Shows the 28 total flow paths.

3 is a cross-sectional view taken along the line CC of FIG. 1, showing a general flow passage of the second fluid 29, a part of which is cut away.

FIG. 4 is a front view of the oil cooler.

FIG. 5 is an exploded perspective view of the oil cooler.

FIG. 6 is a plan view of the oil cooler.

FIG. 7 is a bottom view of the oil cooler.

FIG. 8 is a vertical cross-sectional view showing a usage state of the oil cooler.

[Explanation of symbols]

 1 Element 2 Core 3,4 First fluid inlet / outlet 5,6 Fluid inlet / outlet portion 7,8 Second fluid inlet / outlet 9 Casing 10 Center hole 11, 12 Plate 13 Upper lid 14 Partition 15 Protrusion 17 Hollow bolt 18,19 Pipe 20 Oil Induction cover 21 Top spacer 23 O-ring 24 Reflux hole 25 C-shaped spacer 26 Lower lid 27 First fluid communication hole 28 First fluid 29 Second fluid 30 Second fluid bypass prevention section 32 Flat section 33 hole 34 Engine block 35 Oil flow Inlet 36 Oil outlet 37 Oil filter 38 Filter casing 39 Hole 40 Bypass valve

Claims (3)

[Claims] 1. A core 2 composed of a laminated body of flat elements 1 each having a central hole 10 and having a circular outer periphery in a plane and aligned with each other, and an inner periphery substantially aligned with an outer periphery of the core 2, and the core 2 And a pair of first fluid inlets / outlets 3 and 4 opened to the outer periphery communicate with the fluid inlet / outlet portions 5 and 6 in the element 1, and second fluid inlets / outlets 7 and 8 opened to the outer periphery are the outer periphery of the element 1. And a casing 9 having both axial ends closed, and each of the elements 1 includes a pair of disc-shaped plates 11 and 12 in which the central holes 10 are formed and which are aligned with each other. Having a hole edge portion and an outer peripheral edge of the central hole 10 and a partition portion 14 extending between the inner and outer circumferences in the radial direction, which are liquid-tightly brazed together, and a pair of the partition portions 14 on both sides thereof. Fluid entry / exit parts 5, 6
Are formed to form a flow passage having a flat surface with a flat cross section and a flat cross section, and a large number of protrusions 15 are formed on the flat surface except for the joint portion of the plates 11 and 12. The plate is formed by bending the body, the aggregate forms a band-shaped wave, and the band is arranged in a plane arc shape. The outer surfaces of the respective elements 1 and 1 and the plate in which the element 1 is configured. 11 and 12 have a large number of ridges 15 intersecting with each other and contacting each other at the intersections, and the contacting portions are brazed, and in the vicinity of the partition portion 14, the elements 1 and 1 are arranged in the radial direction. A second fluid bypass prevention portion 30 completely brazed and joined is formed, and the pair of second fluid inlets and outlets 7, 8 are located on both sides in the circumferential direction with respect to the second fluid bypass prevention portion 30 of the element. Facing the peripheral side surface of the core. Thing 9
An oil cooler that is opened on the outer peripheral side of the. 2. The oil cooler according to claim 1, wherein the first fluid 28 and the second fluid 29 flow in directions opposite to each other. 3. The oil cooler according to claim 1, wherein the ridges 15 of the plates 11 and 12 adjacent to each other in the stacking direction are arranged so as to intersect each other at about 90 degrees.