JP2542260Y2 - Oil cooler - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled oil cooler projecting from an outer surface of an engine block of a vehicle, and to an oil cooler which bypasses oil according to the degree of clogging of a core.

[0002]

2. Description of the Related Art As an example of a water-cooled oil cooler for a vehicle,
The core of the laminated heat exchanger is installed inside the donut-shaped casing, oil is guided into the core, and cooling water is circulated on the outer surface of the core to exchange heat between the cooling water and high-temperature oil. There was something to do. Such a heat exchanger is
It was attached to the outer surface of the engine block via bolts. Further, a filter casing containing an oil filter is connected to the oil cooler. In such an oil cooler, when clogging occurs in the core of the oil cooler, a bypass path that requires a relatively large space from the core is provided in order to bypass the oil without flowing through the core and to bypass the oil. .

[0003]

Since such a conventional oil cooler with a bypass is provided with a relatively large bypass mechanism, the space of the core is sacrificed and the heat radiation may be reduced. There is a disadvantage that the bypass path becomes complicated and the number of manufacturing steps increases.

[0004]

Accordingly, an object of the present invention is to provide an oil cooler with a bypass which has a space-saving and extremely simple structure, and has the following structure to achieve the object. That is, the oil cooler of the present invention has a plurality of elements 2 forming a flat annular flow path in which a pair of cooling water circulation holes 1 and 1 are formed, and the elements 2 are connected to each other by the cooling water circulation holes 1. The core 3 is formed by stacking. Then, the core 3 is placed on the base member 6. The base member 6 has a pair of openings 4 connected to the pair of cooling water flow holes 1 in a liquid-tight manner, respectively, and a pair of pipes 5 respectively communicating with the openings 4 protrude from the outer periphery. Further, an oil inlet 12a separated from the opening 4 is provided. Further, the center pipe 7 has a pot-shaped casing 8 projecting from the inner surface, and the opening edge thereof is joined to the peripheral edge of the base member 6.
Then, the hollow bolt 14 penetrates through the center pipe 7. One end of the hollow bolt 14 is screwed into the opening of the oil inflow hole of the engine block 15 to fasten and fix the center pipe 7 and the casing 8.

Further, the other end of the hollow bolt 14 is screwed and fastened to a center hole of a filter casing 13a in which the oil filter 11 is provided. The oil inlet 12a of the base member 6
Oil flowing into the casing 8 from the center pipe 7
The present invention relates to an element configured to flow radially through the outer surface of each of the elements 2 from a gap formed between the core 2 and the core 3. Here, the feature of the present invention is that an oil hole 17 is formed in the center pipe 7 and a bypass hole 18 is formed in an intermediate portion of the hollow bolt 14. The flow resistance of the bypass formed by the oil hole 17 of the center pipe 7 and the bypass hole 18 indicates that only a part of the oil passes through the bypass when the core and the oil filter are not clogged. In addition, a value is set so that the more oil passes through the core and the degree of clogging increases, the more oil flows through the bypass.

[0006]

In FIG. 1, when the core 3 is clogged, more oil flows through the oil hole 17 of the center pipe 7 and the bypass hole 18 of the hollow bolt 14, and returns to the engine block 15 without passing through the core and the filter. I do. The amount of oil recirculation increases in accordance with the degree of clogging of the core 3 or the degree of clogging of the oil filter 11.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of the present oil cooler, FIG. 2 is an exploded view of a main part of the present oil cooler, FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2, FIG. 6 is an exploded perspective view showing the element 2 of the core 3. This oil cooler has a core 3, a base member 6 on which the core 3 is placed, a casing 8 that covers the inner and outer circumferences of the core 3, and a center pipe 7. The core 3 has a pair of metal plates 1a and fins 10 as shown in FIG. Metal plate 1
a is formed in a plate shape formed in the shape of a flat donut. A flange portion is provided at the hole edge and the outer peripheral edge of the center hole 1b, and a partition portion 1f projects between the flange portions on the inner surface side. Then, cooling water circulation holes 1 are formed on both sides of the partition 1f, and a flange portion is formed at a hole edge 1e of the cooling water circulation hole 1. The inner and outer surfaces of the metal plate 1a are each made of an aluminum plate coated with a brazing material. Then, the pair of metal plates 1a are stacked in opposite directions. At this time, the cooling water flow holes 1 are aligned.

Next, the fin 10 is connected to the center hole 1b of the metal plate 1a.
And a multi-entry fin having holes 10a and 10b aligned with the cooling water flow holes 1. That is, it is formed in a waveform, and a number of rectangular holes are cut and raised in the side wall of the waveform. The fins 10 are interposed on the outer surfaces of the pair of metal plates 1a. A closing means is provided on the uppermost surface of such an element laminate so that the cooling water flow hole 1 is closed. Each part is integrally brazed and fixed in a high-temperature furnace. Such a core 3 is mounted on a base member 6 as shown in FIG. At this time, the cooling water flow holes 1 of the core 3 and the openings 4 of the base member 6 are arranged so as to be aligned with each other. As shown in FIG. 3, the openings 4 are recessed independently of each other so as to communicate with the pipes 5. As shown in FIGS. 2 and 3, the base member 6 is provided with an oil inlet 12a. In addition, the base member 6 is made into a double cylindrical tank type with the lower end closed, and the cooling water flow hole 1 of the core and only one of a pair of pipes protruding from the tank are communicated by an inner pipe. Is also good. In this case, the oil inlet 12a is located at the center.

Next, the casing 8 is formed in a pot shape having a hole at the center, the upper end of the center pipe 7 is joined to the center hole, and the lower end of the center pipe 7 is fixed to the center hole of the base member 6 by brazing. I have. A plurality of oil holes 17 are formed in the lower portion of the center pipe 7 at equal intervals. The outer peripheral surface of the casing 8 is joined to the outer peripheral edge of the base member 6 by means such as welding. A large number of oil outlets 12b are formed in the upper end surface of the casing 8 and from the center hole. Next, the hollow bolt 14 inserted into the center pipe 7 has external threads threaded at the upper and lower ends thereof, and a flange portion protrudes from the outer peripheral surface near the upper end. At the same time, a plurality of bypass holes 18 are provided at equal intervals in the intermediate portion.

The oil hole 17 of the center pipe 7 and the bypass hole 18 of the hollow bolt 14 form an oil bypass. The fluid resistance of this bypass is
It is determined by the diameter and the number of the bypass holes 17 and 18.
This value is determined by a relative relationship with the flow resistance of the core 3 and the oil filter 11. When the clogging does not occur, the oil passing through the bypass is allowed to circulate, for example, about several% to 5%, and most of the other oil passes through the core 3 and the oil filter 11. It is set to return to the engine block 15. When the core 3 or the oil filter 11 is clogged,
The pressure in the casing 8 increases in accordance with the degree of the clogging, and the increased pressure is set so that more oil flows through the bypass and returns directly to the engine block 15.

The oil cooler thus constructed is shown in FIG.
As shown in (1), the oil outlet hole of the engine block 15 and the oil inlet 12a of the base member 6 are aligned, and the oil inlet hole 19 and the center hole of the present oil cooler are aligned. The oil cooler is screwed and fastened to the engine block 15 via the hollow bolt 14. Further, a filter casing 13a containing the oil filter 11 is screwed to the upper end of the hollow bolt 14. In the oil cooler thus configured, the oil 12 flows into the gap between the center pipe 7 and the core 3 from the oil outlet hole of the engine block 15 via the oil inlet 12a, and the fins disposed between the outer surfaces of the respective elements 2 10 flows radially outward as shown in FIG. Then, the outer periphery of the core 3 is raised and the oil outlet 12b
From the filter casing 13a, flows through the oil filter 11, descends through the hollow bolts 14, and returns to the engine block 15. Of course, as described above, a part of the oil flows through the oil hole 17 of the center pipe 7 and the bypass hole 18 of the hollow bolt 14 and directly returns to the engine block 15.

The cooling water 13 is supplied from one pipe 5 to the opening 4.
Through the cooling water flow hole 1 of each element 2 into the element, and flows in an annular shape as shown in FIG.
More outflow. Then, heat exchange is performed between the cooling water 13 and the oil 12. Next, when the fins 10 of the core 3 are clogged, more oil is bypassed as shown in FIG. 8 through a bypass path constituted by an oil hole 17 and a bypass hole 18.

[0013]

[Effect of the Invention] The oil cooler of the present invention reduces the flow resistance of the bypass formed by the oil hole 17 provided in the center pipe 7 and the bypass hole 18 provided in the hollow bolt 14, and the core and the oil filter are clogged. If not, a value is set so that only some oil passes through the bypass and most of the oil passes through the core. At the same time, the value is set such that the greater the degree of clogging of the core or the oil filter, the more the oil flows through the bypass. Therefore, a compact bypass circuit that does not require a bypass valve can be formed. Moreover, since the value of the flow resistance of the bypass passage of the present invention is set to a specific value in relation to clogging, oil continuously increased according to the degree of clogging flows through the bypass passage,
It becomes a reliable oil cooler.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the oil cooler of the present invention.

FIG. 2 is an exploded view of a main part of the oil cooler.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along the line VV of FIG. 2;

FIG. 6 is an exploded perspective view of the element 2 used in the oil cooler of the present invention.

FIG. 7 is a plan view of the oil cooler of the present invention.

FIG. 8 is an explanatory view of the bypass hole 18 of the oil cooler of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling water circulation hole 1a Metal plate 1b Center hole 1c Inner flange 1d Outer flange 1e Hole edge 1f Partition 2 Element 3 Core 4 Opening 5 Pipe 6 Base member 7 Center pipe 8 Casing 9 Outer fin 9 10a Hole 10b Hole 11 Oil Filter 12 Oil 12a Oil inlet 12b Oil outlet 13 Cooling water 13a Filter casing 14 Hollow bolt 15 Engine block 16 Cylindrical cavity 17 Oil hole 18 Bypass hole 19 Oil inflow hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of elements (2) forming a flat annular flow path in which a pair of cooling water circulation holes (1) and (1) are formed are connected to each other by the cooling water circulation holes (1). The laminated core (3) and the core (3) are placed, and a pair of openings (4) connected to the pair of flow holes (1) in a liquid-tight manner respectively. A pair of pipes (5) (5) communicating with each other protrude from the outer periphery, and a base member (6) provided with an oil inlet (12a) separated from the opening (4) and a center pipe (7) are formed on the inner surface. A casing (8) having a pot shape protruding from the side, the opening edge of which is connected to the peripheral edge of the base member (6), and one end penetrating the center pipe (7) is provided at one end of the engine block (15). The center pipe (7) and the casing (8) are fastened and screwed to the opening of the oil inflow hole. Both filter housing (13 with a built-in oil filter (11) at the other end
a) a hollow bolt (14) into which a central hole is screwed and fastened, wherein the oil inlet (12) of the base member (6) is provided.
The oil flowing into the casing (8) from a)
An oil cooler configured to flow radially outward through the outer surface of the element (2) from a gap formed between the center pipe (7) and the core (3). ) Formed oil holes (1
7) and a bypass hole (18) formed at an intermediate portion of the hollow bolt (14), and is constituted by an oil hole (17) of the center pipe (7) and the bypass hole (18). When the core and the oil filter are not clogged, only a part of the oil passes through the bypass and most of the oil passes through the core, and the degree of the clogging is determined. The oil cooler is set to a value that allows the oil to flow through the bypass as the value of the oil cooler increases.