JP2000180089A - Radiator incorporating oil cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance assembling performance and maintainability by providing an oil cooler with a screw type cap having a pair of projecting inlet/outlet pipes and screwing it liquidtightly to a circular opening made in one end face of a radiator tank thereby facilitating fixing of the oil cooler after completion of a radiator. SOLUTION: An oil cooler 4 compyises a short bolt-like screw type cap 2 having a head part, a pair of inlet/outlet pipes 1, a large number of oil pipes 3, a baffle plate 13, a U-turn tank 11, and the like. A radiator tank 5 comprises a tubular tank body 5a having opposite ends closed liquidtightly with a pair of end covers 17 wherein the upper end cover 17 has a circular opening 6. The oil cooler 4 is inserted from the circular opening 6 of the radiator tank 5 and secured liquidtightly through a packing or a sealing material by screwing the externally threaded part 14 of the cap 2 into the internally threaded part 15 at the boss part 18 of the circular opening 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an oil cooler housed in a tank of a radiator for cooling engine cooling water.

[0002]

2. Description of the Related Art A conventional radiator with a built-in oil cooler is:
It was configured as follows. As an example, an oil cooler composed of a double pipe has a pair of elongated oil pipes concentrically arranged, both ends of which are closed with each other, and a pair of bosses are provided on the outer periphery of both ends thereof, and each of the bosses has an entrance and exit. The pipe was protruding. A pair of through holes are formed in the side wall of the radiator tank body in conformity with the distance between the pair of boss portions. Then, before assembling the radiator, the oil cooler was housed in the tank body, the inlet / outlet pipe penetrated through the outer surface of the radiator tank, and the penetrating portion was fixed in a liquid-tight manner. After the completion of the core including the tube, the fins, and the tube plate, the opening of the tank body was closed by the tube plate, and the closed portion was liquid-tightly joined.

[0003]

In a conventional radiator with a built-in oil cooler, a pair of inlet / outlet pipes are protruded from both ends of the oil cooler. Work to insert the hole,
And the work of fixing the insertion portion in a liquid-tight manner is extremely troublesome. At the same time, it is necessary to insert an oil cooler into the tank body before assembling the tank body and the tube plate, and the process itself is troublesome. Further, when the oil cooler is inspected and maintained after the radiator is completed, it is necessary to disassemble the tank main body, and there is a drawback that maintenance is lacking. Then, this invention makes it a subject to solve the said problem.

[0004]

According to the first aspect of the present invention, there is provided a screw type cap 2 having a pair of inlet / outlet pipes 1 projecting from the outer surface side, and a screw type cap 2 projecting from the inner surface side of the screw type cap 2. A plurality of oil flow passages communicating with the inlet / outlet pipe 1 are provided, and an elongated oil pipe 3 connected so as to make a U-turn constitutes an oil cooler 4, and one end face of a radiator tank 5 in a longitudinal direction. A radiator with a built-in oil cooler is provided with a circular opening 6 that is aligned with the screw-type cap 2 and the screw-type cap 2 is screwed and fastened to the circular opening 6 in a liquid-tight manner.

According to a second aspect of the present invention, in the first aspect, the screw type cap 2 is formed in a short bolt shape with a head, and the screw type cap 2 is formed with a pair of through holes 7. The inlet / outlet pipe 1 and the oil pipe 3 are liquid-tightly inserted radiators through the through holes 7. According to a third aspect of the present invention, in the second aspect, the screw-type cap 2 has a pair of connection fittings having one end portion matching the pair of the through holes 7 and the other end portion having a flattened funnel shape. 8 and a pair of closing plates 10 in which the other end openings are closed and a plurality of connecting holes 9 are arranged in parallel, and a plurality of cross sections each having one end connected to each connecting hole 9 of the closing plate 10 in a liquid-tight manner. A circular oil pipe 3, a small tank 11 for U-turn in which the other end of each oil pipe 3 communicates in a liquid-tight manner,
It is a radiator with a built-in oil cooler comprising:

According to a fourth aspect of the present invention, in the second aspect, a pair of funnel-shaped ones having one end portion which is aligned with the pair of through holes 7 of the screw type cap 2 and the other end portion is flat. A connection fitting 8, a pair of flat oil pipes 3a each having one end connected to the other end opening in a liquid-tight manner, and a small tank for U-turn in which the other end of each oil pipe 3a communicates in a liquid-tight manner.
11. A radiator with a built-in oil cooler, comprising:

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing a state in which the oil cooler 4 is taken out of the oil cooler built-in radiator, FIG. 2 is an exploded explanatory view of the oil cooler 4, and FIG. As shown in FIGS. 1 and 2, the oil cooler 4 housed in the radiator includes a screw-type cap 2 formed in a short bolt shape having a head, a pair of inlet / outlet pipes 1 and a connection fitting 8, and a large number of oils. Pipe 3, baffle plate 13,
It consists of a small tank 11 for U-turn. A pair of through holes 7 are formed in the screw type cap 2 as shown in FIG. 2, and an outer screw portion 14 is formed on the outer periphery. A pair of inlet / outlet pipes 1 is inserted into the through hole 7 on the outer surface side of the screw-type cap 2, and the insertion portion is liquid-tight brazed and fixed. One end of a flat funnel-shaped connection fitting 8 is inserted into a pair of through holes 7 on the inner surface side of the screw-type cap 2, and the insertion portion is liquid-tight brazed and fixed.

The other end of the connection fitting 8 has a closing plate.
One end of the oil pipe 3 is inserted into each of the plurality of connection holes 9 of the closing plate 10 and the insertion portions are liquid-tight brazed and fixed. An inner fin 12 is housed in the oil pipe 3. An intermediate portion of each oil pipe 3 is supported by a plurality of baffle plates 13. The baffle plate 13 has a circular or square outer periphery, forms a spacer between the plurality of oil pipes 3, and stirs cooling water flowing in the radiator tank 5 in the longitudinal direction.
This is to improve the heat radiation of the oil cooler. The U-turn small tank 11 arranged at the other end of the oil cooler 4
It comprises a small tank main body 11a having one end opened and a tube sheet 11b closing the opening. Then, the other end of the oil pipe 3 is inserted into each connection hole 9 of the tube sheet 11b, and the insertion portion is liquid-tight brazed and fixed.

The oil cooler 4 shown in FIG. 1 is completed, and the oil cooler 4 is stored in the radiator tank 5. The radiator tank 5 of this example is configured such that a pair of end covers 17 are liquid-tightly closed at both ends of a cylindrical tank body 5a. A circular opening 6 is formed in the upper end cover 17, and a boss 18 is arranged around the periphery of the circular opening 6.
The inner threaded portion 15 is formed on 18. This inner screw part 15
It is aligned with the external thread portion 14 of the screw type cap 2. Further, a tube insertion hole (not shown) is inserted into the side surface of the radiator tank 5, and each tube end of a core composed of a fin and a tube penetrates through the tube insertion hole, and the penetrating portion is liquid-tight brazed and fixed. . In the radiator, such a radiator tank 5 is separated to the left and right (the left side is omitted), and the right radiator tank 5 forms a cooling water outlet side tank.

The oil cooler 4 is inserted through the circular opening 6 of the radiator tank 5 thus constructed, and its boss 18
The outer screw portion 14 of the screw type cap 2 is screwed and fastened to the inner screw portion 15. Then, between the screw type cap 2 and the circular opening 6 is liquid-tightly fastened and fixed via a packing or a sealing material (not shown). An oil pipe is connected to each of the pair of inlet / outlet pipes 1, and high-temperature oil flowing from one of the inlet / outlet pipes 1 flows down the three oil pipes 3 located on one side, thereby forming a small tank for U-turn. A U-turn is performed at 11, and the three oil pipes 3 on the other side are raised, and the oil pipes 3 flow out of the other entrance / exit pipes 1. The oil is cooled by the cooling water in the radiator tank 5 while flowing through each oil pipe 3.

Next, FIG. 3 shows another example of the oil cooler 4. This example has a pair of flat oil pipes 3a, and the inner fins 12 are arranged in the flat oil pipe 3a. One end is connected to one end opening of the connection fitting 8, and the other end is liquid-tightly fixed to the tube insertion hole of the tube plate 11 b of the small tank 11 for U-turn.

[0012]

The radiator with the built-in oil cooler of the present invention is constructed such that the screw-type cap 2 of the oil cooler 4 is screwed and fastened to the circular opening 6 of the radiator tank 5 in a liquid-tight manner. Later oil cooler 4
Can be attached to the radiator tank 5 very easily. Further, the liquid tightness and strength of the mounting portion can be sufficiently maintained, and a highly reliable radiator with a built-in oil cooler can be provided. In addition, the radiator can be satisfactorily assembled. That is, unlike the conventional oil cooler, the troublesome work of storing the oil cooler inside before assembling the tank and thereafter assembling the radiator tank and the core is unnecessary. At the same time, maintenance such as inspection and repair of the oil cooler becomes easy.

According to the second aspect of the present invention, since the screw type cap 2 is formed in a short bolt shape with a head, the screw type cap 2 of the oil cooler 4 is screwed into the circular opening 6 of the radiator tank 5. At the time of the fastening, the head can be reliably screwed, and the reliability of the fastening between them can be improved. According to the third aspect of the present invention, the presence of the connection fitting 8 and the small tank 11 for U-turn makes it possible to provide a large number of oil pipes 3 and to incorporate an oil cooler having high heat radiation performance into the radiator. Can be. According to the invention described in claim 4, the connection fitting 8 and the small tank for U-turns
The oil cooler 11 and the flat oil pipe 3a make it easy to assemble, have a small number of parts, and have a large heat radiation area in the radiator.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a state where an oil cooler 4 is taken out of a radiator with a built-in oil cooler of the present invention.

FIG. 2 is an exploded view of the oil cooler 4;

FIG. 3 is an exploded view of another oil cooler 4 of the radiator with a built-in oil cooler of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Entrance pipe 2 Screw type cap 3 Oil pipe 3a Oil pipe 4 Oil cooler 5 Radiator tank 5a Tank body 6 Circular port 7 Through hole 8 Connection metal fitting 9 Connection hole 10 Closing plate 11 Small tank for U-turn 11a Small tank body 11b Tube plate 12 Inner fin 13 Baffle plate 14 External thread 15 Internal thread 16 Radiator core 17 End cover 18 Boss 19 Cooling water pipe

Claims (4)

[Claims] 1. A screw-type cap 2 having a pair of inlet / outlet pipes 1 protruding on an outer surface thereof, and a plurality of oil flow passages projecting from an inner surface of the screw-type cap 2 and communicating with the inlet / outlet pipe 1. The oil cooler 4 is constituted by a slender oil pipe 3 which is provided and connected so as to make a U-turn. A circular port 6 which is aligned with the screw type cap 2 is formed on one end surface of the radiator tank 5 in the longitudinal direction. A radiator with a built-in oil cooler, wherein the screw-type cap 2 is screwed into the circular opening 6 in a liquid-tight manner. 2. The screw-type cap according to claim 1, wherein the screw-type cap is formed in a short bolt shape with a head, a pair of through-holes is formed in the screw-type cap, and the entrance / exit pipe is formed in the through-hole. A radiator with a built-in oil cooler in which the oil pipe 1 and the oil pipe 3 are inserted in a liquid-tight manner. 3. A pair of funnel-shaped connection fittings 8 according to claim 2, having one end portion matching the pair of through holes 7 of the screw-type cap 2, the other end portion having a flat funnel shape, and the other end. A pair of closing plates 10 each having a plurality of connecting holes 9 arranged in parallel, and a plurality of circular oil pipes 3 having one end liquid-tightly connected to each of the connecting holes 9 of the closing plate 10. A radiator with a built-in oil cooler, comprising: a small tank 11 for U-turn in which the other end of each oil pipe 3 communicates in a liquid-tight manner. 4. A pair of funnel-shaped connecting metal fittings 8 according to claim 2, having one end portion which is aligned with the pair of through holes 7 of the screw type cap 2, and the other end portion having a flattened funnel shape. An oil cooler built-in radiator comprising: a pair of flat oil pipes 3a each having one end connected to the opening in a liquid-tight manner; and a small U-turn tank 11 in which the other end of each oil pipe 3a communicates in a liquid-tight manner.