JPH0523976Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a housing-less oil cooler installed in internal combustion engines and the like.

(Prior Art) For example, there is a housing-less type oil cooler installed in an internal combustion engine, etc., disclosed in Japanese Utility Model Application Publication No. 144378/1983. The oil cooler 1 shown in FIGS. 4 and 5 includes a cooler core 5 in which dish-shaped plates 2 having a central opening 2a are laminated, the inside of which is partitioned into an oil flow path 3 and a water flow path 4, and the lower side thereof An annular lower end plate 6 having an oil inlet hole 6a is disposed therein. Oil outlet hole 7 on the upper side of the cooler core 5
A, an annular upper end plate 7 having a water inlet hole 7b and a water outlet hole 7c is disposed, and an annular crown plate 8 is provided on the upper surface thereof. The inside of the crown plate 8 is divided by partition plates 8a and 8b and communicates with a water inlet hole 7b and a water outlet hole 7c. The cooler core is also similar to the one disclosed in Japanese Patent Application Laid-Open No. 61-223213, which is a stack of annular dish-shaped plates each having two concentric openings for oil and water passages.
An oil outlet and a water inlet/outlet are defined by the above-mentioned crown plate.

(Problems to be solved by the invention) In the case where the oil outlet and the water inlet/outlet are to be provided on the upper side of the oil cooler as described above, the attachment part to the upper end plate of the crown plate and the partition in the crown plate are required. Although oil must be separated from inflow and outflow water by plates, the attachment of the crown plate to the end plate or the partition plate within the crown plate forms a boundary between each fluid, which tends to create gaps. Even if it is fixed by brazing, it is easy for oil, inflow water, and runoff water to get mixed in.

The oil cooler 1 as described above has an oil filter 10 placed on its crown plate 8, and a hollow center bolt 11 screwed onto the oil filter is inserted into the central opening of the oil cooler.
Since the lower end of the oil cooler is screwed onto the base 12 and tightened, the oil cooler is not directly tightened to the center bolt but is sandwiched between the oil filters from above the crown plate. Therefore, in this case, the tightening force is distributed relatively evenly over the cooler core, so that the cooler core does not collapse. However, when installing only the oil filter, the crown plate can be omitted, but on the other hand, when installing it on the base, the head or collar of the center bolt must be directly tightened around the center opening, so this part cannot be used. There is a risk that the cooler core may buckle due to locally concentrated stress.

(Means for solving the problem) This idea eliminates the above-mentioned partitioning means such as the crown plate and partition plate to prevent oil and water from entering, and also prevents the occurrence of concentrated stress in the oil cooler due to the tightening of the center bolt. It is intended to prevent

That is, an oil outlet hole, a water inlet hole, and a water outlet hole are provided on the upper surface of the cooler core formed by stacking plates, and an upper end plate having a central opening is disposed, and a bulge that covers the oil outlet hole and the central opening is provided. The oil cooler is provided with a cover plate having a section, a retainer is provided in the bulging section between the cover plate and the upper end plate, and a water inlet pipe and a water outlet pipe are attached to the water inlet hole and the water outlet hole, respectively. The bulge has a symmetrical shape with respect to the central opening.

(Function) In the oil cooler of this invention, oil flows upward from below the cooler core, enters the cooler core from the water inlet pipe, and exchanges heat with water flowing out from the water outlet pipe. The oil flows from the oil outlet hole through the bulge to the hollow part of the hollow center bolt passing through the central opening. In addition, since the cooling water enters the cooler core from the water inlet pipe and is discharged from the water outlet pipe, the flow paths for oil, inlet water, and outlet water are separated from each other outside the cooler core, causing them to mix with each other. There's nothing to do. Further, when the center bolt is tightened, the tightening force is received by the bulge and is symmetrically transmitted to the peripheral portion, so that stress is not biased. Further, a retainer is provided on the periphery of the central opening of the bulge that directly contacts the bolt, and transmits and disperses the tightening force to the lower upper end plate.

(Example) FIG. 1 shows an example of this invention. The oil cooler 21 has a cooler core 25 in which plates 22 are laminated to form an oil flow path 23 and a water flow path 24 inside.
A lower end plate 26 is provided with an oil inlet hole 26a and a central opening on its lower surface, and an oil outlet hole 27a, a water inlet hole 27b, and a water outlet hole 27 on its upper surface.
c and an upper end plate 27 having a central opening 27d are stacked on top of each other. A cover plate 29 having a bulge 28 covering the central opening 27d and the oil outlet hole 27a is stacked on the upper surface of the upper end plate 27. The cover plate 29 has a water inlet hole 29a and a water outlet hole 29b in a flat portion extending around the bulge 28. The cover plate 29 may consist only of the bulging portion 28 and may not include a flat portion. The bulging portion 28 has a central opening 28a at the upper center and has an elliptical shape symmetrical on both sides thereof. Inner wall of bulge 28 and upper end plate 27
A cylindrical retainer 30 having a horizontal hole 30a is provided around the central openings 27d and 28a. A water inlet pipe 31 is attached to the overlapping water inlet holes 27b and 29a, and a water outlet pipe 32 is attached to the water outlet holes 27c and 29b. plate 22
are formed of thin plates, and the lower end plate 26 and the upper end plate 2
7. The cover plate 29 is formed from a thick plate and integrally soldered. As shown in FIG.
4 openings 22 on the concentric circle of the flat part between
The two opposing flanges 22d are provided with flanges 22d. The plates 22 are stacked on top of each other at a 90° pitch to form a cooler core 25.

As is clear from the above configuration, outside the cooler core, the inflow and outflow sides of oil and water are separated from each other, and there is no contact area bordered by the partition plate or mounting area, so there is no possibility of contamination. That's not it. When installing the oil cooler, the bolts 33 are tightened as shown in Fig. 1, and the force is transmitted from the bolt head 33a to the periphery of the central opening 28a of the bulge. The cooler core 25 is received by the cover plate 29 and the upper end plate 27 through the retainer 30.
Since it is evenly separated throughout, there is no possibility of the oil cooler being crushed.

(Effects of the invention) Since the oil cooler of this invention has the above-mentioned configuration, the inlet and outlet channels for oil and water are distributed and arranged separately, so there is no risk of mixing, and there is no need to tighten the bolts during installation. No deformation occurs due to tightening.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the oil cooler of this invention, and FIG. 2 is a plan view thereof. FIG. 3 is a plan view of the plate, FIG. 4 is a sectional view of a conventional oil cooler, and FIG. 5 is a plan view thereof. 22...Plate, 25...Cooler core, 26
... lower end plate, 27 ... upper end plate, 28 ... bulge,
29...cover plate, 30...retainer.

Claims (1)

[Scope of utility model registration request] An oil inlet hole is provided on the lower side of the cooler core, which has a central opening and a layered space formed by overlapping annular plates with flanges on the outer periphery and the periphery of the central opening, which is divided into an oil flow path and a water flow path. A lower end plate is disposed, an upper end plate having a central opening on the upper surface of the cooler core and provided with an oil outlet hole, a water inlet hole, and a water outlet hole is disposed on the upper end plate. A cover plate is provided with a bulge that covers the central opening and is symmetrical with respect to the center of the central opening, a retainer is disposed within the bulge, and a water outlet pipe and a water inlet are provided in the water outlet hole of the upper end plate. A housing-less oil cooler with a water inlet pipe attached to the hole.