Metal fusion bonding – Process – Plural joints
Patent
1990-06-26
1991-09-03
Ramsey, Kenneth J.
Metal fusion bonding
Process
Plural joints
228245, B23K 118
Patent
active
050445456
DESCRIPTION:
DESCRIPTION
BEST MODE FOR PRACTICING THE INVENTION
Each embodiment of the oil cooler and the process for manufacturing of the present invention are described hereinafter according to the drawings.
Referring firstly to FIGS. 1 to 11, the oil cooler of the present invention is described hereinafter. FIG. 1 shows an oil cooler A of the first embodiment, and FIG. 2 shows an oil cooler B of the second embodiment, respectively. In the first embodiment, a tube bundle 10 is made up of three tubes 1. In the second embodiment, a tube bundle is made up of five tubes 1. The second embodiment has higher cooling capacity since the second embodiment has more tubes. However, excepting the number of tubes, the construction is substantially common to the first and second embodiments. Therefore, the first embodiment is described hereinafter as a representative embodiment of the present invention.
The tube 1 is a copper pipe with an outside diameter of 7.85 mm, an inside diameter of 6 mm and an effective length of 120 mm. The diameter and length of the tube 1 can be increased and decreased freely depending upon the required cooling capacity and the installing space.
The reference numeral 2 designates chambers which are fixed to both ends of the tube bundle 10, respectively. The chamber 2 comprises a cylindrical body 3 having a bottom and a disk like lid 4. The end portions of the tubes 1 are inserted into holes 5 formed in the lid 4 and are fixed to the lid 4. Fitting 6 for connecting the body with a rubber hose is attached to the side wall of the body 3. The chamber 2 has a cylindrical inner space. Pressure oil from the fitting 6 flows to the tubes 1 through the space, and the pressure oil from the tubes 1 flows to the other fitting 6 through the space.
The reference number 7 designates cooling fins, each of which is made of a steel flat sheet. Three insertion holes 8 (five insertion holes 8 in the second embodiment) for inserting the tubes 1 are formed in the cooling fin 7. Each insertion hole 8 has an inner brim 9 projecting along the axial direction of the hole 8. The cooling fins 7 are fixed to the tubes 1 by inserting the insertion holes 8 therethrough.
The fin 7 is formed with pores 11 positioned nearly above each insertion holes 8, respectively. The pore 11 is a hole to insert a linear brazing material for brazing the brim 9 to the tube 1.
The cooling fin 7 in the first embodiment is a square sheet having a size of 24.times.24 mm, and the cooling fin 7 in the second embodiment is a square sheet having a size of 31.times.31 mm. In the both embodiments, 26 sheet of cooling fins 7 are fixed to the tubes 1 at intervals of 4 mm, respectively. The size and number of the cooling fins can be increased and decreased freely depending upon the required cooling capacity.
Next, advantages of the oil cooler of the first embodiment are described as follows.
The first advantage of the embodiment is that the size is small. The center-to-center distance L between the fittings 6 is 140 mm, and the height H from the bottom of the chamber 2 to the top of the fitting 6 is merely 56 mm. Accordingly, as compared with the conventional device shown in FIG. 13 (the length of the pipe 51 is 1.8 m), piping interior volume (i.e. amount of the used oil) in the present embodiment is reduced to 26%, the piping cubic contents (i.e. the piping space) is reduced to 65%, and weight is reduced to 52% of the conventional device. Nevertheless, the present embodiment has a superior cooling capacity than the comparative example (shown in FIGS. 4 to 5) corresponding to the conventional device (shown in FIG. 13) as mentioned later.
Secondly, flow passage resistance or line resistance is low. The reason is that the flow passage sectional area is enlarged by employing a plurality of tubes 1 arranged in parallel.
The pressure loss resulting from the resistance is examined with a testing machine shown in FIG. 3. In FIG. 3, the reference numeral 15 designates a flow meter, the numeral 16 designates a pressure sensor on the upstream side, the numeral 17 designates a pressure sen
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patent: 3411196 (1968-11-01), Zehnder
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Matsuda Masayuki
Nishimura Toyoharu
Norimatsu Naoki
Takagi Yasuji
Tanaka Mamoru
NHK Spring Co. Ltd.
Nichirin Rubber Industrial Co., Ltd.
Nissan Motor Co,. Ltd.
Ramsey Kenneth J.
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