JPH064225Y2 - Housingless oil cooler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a housingless oil cooler mounted on an internal combustion engine or the like.

(Prior Art) An example of a housingless oil cooler mounted on an internal combustion engine is disclosed in Japanese Utility Model Publication No. 61-144378. The oil cooler 1 shown in FIG. 4 is formed by laminating dish-shaped plates 2 having a central opening 2a, and the inside of which is an oil passage 3.
An annular lower end plate 6 having a cooler core 5 divided into a water passage 4 and an oil inlet hole 6a is disposed below the cooler core 5. An oil outlet hole 7a and a water inlet hole 7b are provided above the cooler core 5.
An annular upper end plate 7 having a water outlet hole and a water outlet hole is provided, and an annular crown plate 8 for partitioning an oil outflow side, a water inflow side, and an outflow side is provided on an upper surface thereof. The oil cooler 1 is attached to a base 12 with a center bolt 11 together with an oil filter 10 which is arranged on the crown plate 8 so as to be overlapped.

Further, the plate type oil cooler disclosed in Japanese Patent Laid-Open No. Sho 61-223213 is obtained by stacking annular plate-shaped plates provided with two openings each serving as a passage for oil and water, and forming the oil in alternate layers. A water flow path is formed so that the oil flows in from the lowermost plate, flows into the annular cover (FIG. 4 of the same publication, FIG. 14) from the uppermost plate, and flows out above the oil cooler. Let it flow into the oil filter located above the cover.

In these oil coolers, the oil filter is attached to the upper surface of the crown plate or the cover having the annular cavity inside as described above, and is tightened to the engine side by the hollow center bolt penetrating the oil filter and the oil cooler.
The oil flows through the oil cooler to the upper surface thereof, flows into the oil filter, and returns to the engine side through the hollow portion of the center bolt.

(Problems to be Solved by the Invention) In the conventional housingless oil cooler, unless the oil filter is mounted on the upper side as described above, a passage for circulating to the engine side through the central opening is not formed. Therefore, such an oil cooler cannot be used in the lubricating oil circuit in which the oil filter and the oil cooler are separately mounted.

In addition, when the oil cooler and the oil filter are stacked and installed, the shape becomes strong, so it is necessary to make the vibration resistance of the oil cooler stronger than when using the oil cooler alone, and it is necessary to add reinforcing means to the member, It increases the weight.

(Means for Solving the Problem) Plates provided with flanges on the outer peripheral edge and the peripheral edge of the central opening are overlapped with each other, and the plate is provided on the upper and lower surfaces of a cooler core in which oil passages and water passages are formed. An upper end plate and a lower end plate equipped with the same flange are fixed to each other to form a flow path for exchanging heat between the lower surface of the lower end plate and the upper end plate for heat exchange, and an oil outlet hole provided in the upper end plate. Attach the cover plate that covers the central opening to the top plate,
The oil cooler is attached to the base with a hollow center bolt penetrating the central opening, and the oil outlet hole of the upper end plate and the hollow portion of the center bolt are communicated with each other through a lateral hole provided in the cover plate and the center bolt.

(Function) This oil cooler exchanges heat by allowing oil to flow into the oil cooler from the base side of the engine, etc., through the lower surface of the lower end plate, and through the oil outlet of the upper end plate through the inside of the oil cover and the lateral hole of the center bolt. Oil flows into the hollow part and circulates to the base side.

The cover plate provided on the upper surface of the upper end plate forms a flow path to the hollow portion of the oil cooler body and the center bolt, and it is not necessary to interpose an oil filter.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The oil cooler 21 has a plate 22 laminated to form an oil passage inside.
23 and a cooler core 25 in which a water flow path 24 is formed, a lower end plate 26 having an oil inlet hole 26a and a central opening 26b is arranged on the lower surface thereof, and an oil outlet hole 27 is formed on the upper surface as shown in FIG.
An upper plate 27 having a, a water inlet hole 27b, a water outlet 27c and a central opening 27d is stacked and fixed. A cover plate 28 is provided on the upper surface of the upper end plate 27 so as to cover the oil outlet hole 27a and the central opening 27d and form a cavity 28a. The oil cooler 21 is fastened to the mounting base 32 by a hollow center bolt 31 penetrating the central openings 27d and 26b and the flange 22a (Fig. 3), and the inside of the cover plate 28 is a lateral hole 31a provided in the center bolt 31. The oil return passage is formed by communicating with the hollow portion 31b of the center bolt.
A water inlet pipe 29 and a water outlet hole 2 are provided in the water inlet hole 27b of the upper end plate 27.
A water outlet pipe 30 is attached to 7c.

The plate 22 is made of a thin plate, and is provided with a flange 22a on the peripheral edge of the central opening and a flange 22b on the outer peripheral edge as shown in FIG. 3, and four openings 22c are formed on the concentric circles of the flat portion between them at equal pitches. A flange 22d is provided at the two openings facing each other. The plates 22 are overlapped with each other by shifting the pitch by 90 ° to form a cooler core 25, and an oil flow path 23 and a water flow path 24 which are alternately communicated with each other are formed. Top plate 27
Is a thick plate having a flange 27e on the periphery of the central opening 27d and a flange 27f on the outer periphery, and has the same shape as the flanges 22a and 22b of the plate 22, respectively. The lower end plate 26 is a thick plate, and is provided with a flange 26c having the same shape as the flange 22a at the peripheral edge of the central opening 26b and a flange 27d having the same shape as the flange 22b at the outer peripheral edge. A ring-shaped center ring 26e extending inward from the flange 26c is provided, and its inner diameter is set to be slightly larger than the outer diameter of the center bolt 31. Further, a convex portion 26f having substantially the same size as the opening 22c of the plate is provided at the symmetrical position of the oil inlet hole 26a, and the opening 22c of the lowermost plate 22 is provided.
One of them is fitted to serve as a position for stacking the plates.

Oil enters the oil flow path 23 from the lower surface of the lower end plate 26 through the oil inlet hole 26a, and through the oil outlet hole 27a of the upper end plate 27, the hollow portion 28a of the cover plate 28, the lateral hole 31a of the center bolt 31, and the hollow portion 31b. Return to the engine side. In addition, the cooling water enters the water inlet pipe 29 and the water inlet hole 27b into the water flow path 24 to cool the oil, and then passes through the water inlet hole 27c and the water outlet pipe 30.
Go out.

(Effect of the Invention) In the oil cooler of the present invention, the plates are overlapped to form an oil flow path and a water flow path, and a lower end plate having an oil inlet hole and an upper end plate having an oil outlet hole are fixed, and an upper end plate is also provided. The cover plate on the top allows the oil that comes out of the cooler core to flow into the hollow part of the center bolt that passes through the center of the oil cooler and to return to the engine side. No need to stack an oil filter on top of the cooler.

Therefore, it becomes possible to employ the housingless oil filter in an engine in which an oil filter is separately installed. In addition, since the oil filters are not stacked, the seismic load is reduced, and the weight of the oil cooler can be reduced.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the oil cooler of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a plan view of a plate. FIG. 4 is a sectional view of a conventional oil cooler. 22 ... Plate 25 ... Cooler core 26 ... Bottom plate 26a ... Oil inlet holes 26c, 26d ... Flange 27 ... Top plate 27a ... Oil outlet holes 27e, 27f ... Flange 28 ... Cover plate 31 ... Center bolt 31a ... Horizontal hole 31b ... Hollow part

Claims (1)

[Scope of utility model registration request] 1. A flange having the same shape as the plate on the upper and lower surfaces of a cooler core in which an outer peripheral edge and a peripheral edge of a central opening are provided with flanges, and an oil passage and a water passage are formed inside thereof. The upper and lower plates are fixed to each other, the oil flows in from the lower surface of the lower plate, and the oil flows out to the upper surface of the upper plate for heat exchange. In the oil cooler having the hollow portion as the oil circulation passage, the cover plate covering the oil outlet hole and the central opening provided in the upper end plate is attached to the upper end plate, and the horizontal hole provided in the cover plate and the center bolt. A housingless oil cooler in which the oil outlet hole of the upper end plate and the hollow portion of the center bolt are communicated with each other via the.