JPH07655Y2 - Oil cooler with built-in cylinder block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an oil cooler which is built in a cylinder block of an engine and cools engine oil.

[Conventional technology]

In an oil cooler with a built-in cylinder block, a plurality of oil cooler elements through which engine oil passes are arranged at intervals in the engine cooling water passage in the cylinder block to form an array. The number of body oil cooler elements is changed according to the engine specifications. Such an oil cooler with a built-in cylinder block is very advantageous in manufacturing because it is sufficient to change the number of oil cooler elements depending on the engine specifications and the cylinder block and the like can be shared. At that time, the distance between the oil cooler element at the end of the array and the inner wall of the engine cooling water passage changes, but the conventional oil cooler with a built-in cylinder block does not have means for optimally adjusting the distance. .

That is, in FIG. 5 showing a conventional example, 10 is a cylinder block, and a water gallery 12 as a passage for engine cooling water is provided on a side portion of the cylinder block 10.
Are formed. The opening side portion of this water gallery 12 is closed by a side plate 14, and a plurality of flat plate-shaped oil cooler elements 18 are housed in the water gallery 12 with an optimum interval, respectively, to form an array 19. Configure and guide the engine oil inside.

At both ends of the water gallery 12, an inlet 22 and an outlet 22 are provided.
24 is provided, the engine cooling water is introduced into the water gallery 12 through the inlet 22 and flows out through the outlet 24, but as described above, the number of the oil cooler elements 18 varies depending on the engine specifications. Therefore, when the distance between the array body 19 in the water gallery 12 and the side plate 14 side is set to be substantially equal to the distance between the oil cooler elements 18, the outermost oil cooler element 18A on the other side and the inner wall of the cylinder block 10 are The size of the interval is indefinite.

On the other hand, the actual development Sho 58-180313 micro film and the actual development Sho
No.57-132010 Micro film closes the gap between the array of oil cooler elements and the cylinder block to prevent engine cooling water from escaping from the gap between the array of oil cooler elements and the cylinder block. , The engine cooling water is made to effectively flow between the oil cooler elements of the array.

[Problems to be solved by the device]

In the prior art shown in FIG. 5, depending on the engine specifications, the distance between the oil cooler element 18A and the side wall of the water gallery 12 becomes excessively large as compared with the distance between the oil cooler elements in the arrangement of the oil cooler elements. The engine cooling water does not flow sufficiently between the oil cooler elements 18 of the array 19 and the cooling efficiency of the engine oil decreases.

No. 58-180313 Microfilm and No. 57-13
No. 2010 microfilm oil cooler is not a cylinder block built-in oil cooler, but these oil coolers are housed in a cover protruding from the cylinder block according to its size, and it is difficult to make the cover common.
Therefore, there is no problem with these oil coolers in order to improve the cooling efficiency of the oil cooler by coping with the change in the specification of the engine while securing the advantages of the oil cooler with a built-in cylinder block. Furthermore, in these oil coolers, the gap between the array of oil cooler elements and the cylinder block is completely closed. In this case, however, the oil cooler element at the end of the array cools the engine cooling water on the outer surface side. Since it is not flown and is not cooled by the engine cooling water from the outer surface side, the specific heat radiation amount of the oil cooler is reduced.

The purpose of this invention is to achieve good cooling efficiency in an oil cooler with a built-in cylinder block, regardless of engine specifications, and to obtain a cooling function from the outer surface side of the oil cooler element at the end of the array. It is something to try.

[Means for Solving the Problems]

In the oil cooler with a built-in cylinder block, which is the premise of the present invention, a plurality of oil cooler elements that are arranged at intervals and through which engine oil flows form an array, and the array cools the engine of the cylinder block. It is housed in a water passage. In the cylinder block built-in oil cooler of the present invention, the specific heat radiation amount of the oil cooler should be maximized by protruding from the side wall of the engine cooling water passage toward the array body while leaving a flow path gap between the oil cooler and the array body. The overhang member selected according to the engine specifications is attached to the side wall of the engine cooling water passage.

[Action]

An overhanging member selected according to the engine specifications is attached to the side wall of the engine cooling water passage, and this overhanging member overhangs the side wall of the engine cooling water passage to provide a flow path on the outer surface side of the oil cooler element at the end of the array. Optimally squeeze. As a result, the flow path resistance between the gap between the oil cooler elements of the array and the flow path gap on the outer surface side of the oil cooler element at the end of the array is balanced, and the engine cooling water is transferred to each oil cooler of the array. Balanced flow occurs between the gaps between the elements and the flow passage gaps on the outer surface side of the oil cooler elements at the ends of the array. The oil cooler element at the end of the array is
The engine cooling water flowing through the flow passage gap on the outer surface side also cools the outer surface side.

〔Example〕

 The present invention will be described below with reference to the embodiments shown in the drawings.

First, FIG. 2 is a perspective view showing the cylinder block built-in type oil cooler according to the embodiment together with the internal structure thereof.
A water gallery 12 is formed on a side portion of the cylinder block 10 as a passage for the engine cooling water, the cross section of which is expanded to allow the engine cooling water to pass therethrough. Sides of the water gallery 12 are open and the side plate 14 is bolt 16
Is fixed to the cylinder block 10 by the above, and the opening side of the water gallery 12 is liquid-tightly closed. A plurality of flat plate-shaped oil cooler elements 18 are housed in the water gallery 12 at optimal intervals to form an array body 19, and guide the engine oil to the inside. The overhanging member 20 is fixed to a side inner wall of the water gallery 12.

FIG. 3 is a schematic side view of the oil cooler with a built-in cylinder block as seen from the direction III in FIG. An inlet 22 and an outlet 24 are provided at lower and upper portions of both ends of the water gallery 12 with respect to the horizontal direction, and engine cooling water is introduced from the inlet 22 into the water gallery 12 and exits from the outlet 24. In addition, an inlet pipe casing 26 and an outlet pipe casing 28 are connected to both ends of the oil cooler element 18 in the horizontal direction, and engine oil is introduced into the oil cooler element 18 from the inlet pipe casing 26 and the outlet pipe casing
Flow to 28. The arrow 30 indicates the flow of engine cooling water in the water gallery 12.

FIG. 1 is a detailed cross-sectional view of an oil cooler with a built-in cylinder block. The overhanging member 20 is formed in an L-shaped cross section, extends horizontally along the array 19, and is fixed to the side inner wall of the water gallery 12 by bolts 32.
A flow path gap 34 is formed between the oil cooler element 18A of the array 19 that faces the tip of the overhanging member 20, that is, the oil cooler element 18A located at the end of the array 19 on the overhanging member 20 side. The overhang member 20 narrows the flow passage gap of the engine cooling water on the outer surface side of the oil cooler element 18A, and the dimension C of the flow passage gap 34 is determined by the specific heat radiation amount of the oil cooler, as will be described later with reference to FIG. It is set to be maximum, and in this case, it is almost equal to the dimension of the gap between the oil cooler elements 18 in the array 19 and the dimension of the gap between the oil cooler element 18 closest to the side plate 14 of the array 19 and the side plate 14. Has been done. The number of oil cooler elements 18 forming the array 19 differs depending on the engine specifications. Therefore, the distance between the oil cooler elements 18A and the inner wall of the water gallery 12 also differs depending on the engine specifications. Various overhanging members 20 having different protruding dimensions toward the array body 19 are prepared, and the overhanging member 20 that can obtain the optimum dimension C is selected.

The operation of the embodiment will be described.

As a result of adjusting the flow passage gap on the outer surface side of the oil cooler element 18A by the overhang member 20, the flow passage resistance of the flow passage gap on the outer surface side of the oil cooler element 18A and the gap between the oil cooler elements 18 of the array body 19 are adjusted. In order to achieve harmony with the flow path resistance of the engine cooling water, the oil cooler element
It flows in a balanced manner between both sides of the array body 19 in the width direction and between the oil cooler elements 18 without being concentrated between the 18A and the inner wall of the water gallery 12. Oil cooler element 18
The engine cooling water flowing on the outer surface side of A cools the oil cooler element 18A from the outer surface side. In this way, the heat radiation amount of the oil cooler element 18 increases, and the cooling efficiency of the engine oil in the oil cooler element 18 increases.

FIG. 4 is a graph showing the relationship between the dimension C of the passage gap 34 and the specific heat radiation amount of the oil cooler. Specific heat dissipation is 3 for dimension C
It is maximum when it is ~ 4 mm.

[Effect of device]

According to this invention, the overhanging member selected according to the engine specifications is mounted on the side wall of the engine cooling water passage, and the overhanging member provides the optimally narrowed flow path gap of the oil cooler element at the end of the array. While leaving between the outer surface side,
Overhang from the side wall of the engine cooling water passage. As a result, the engine cooling water flows in a balanced manner between the oil cooler elements of the array and on the outer surface side of the oil cooler element at the end of the array, and in particular, the oil cooler element at the end of the array is Because it is cooled by cooling water,
It is possible to maximize the specific heat dissipation of the oil cooler regardless of the engine specifications. In addition, the advantages of the oil cooler with a built-in cylinder block are also secured.

[Brief description of drawings]

1 to 4 relate to an embodiment of the present invention, FIG. 1 is a detailed cross-sectional view of a cylinder block built-in oil cooler, and FIG. 2 is a perspective view showing the cylinder block built-in oil cooler together with its internal structure. , Fig. 3 is III of Fig. 2
Fig. 4 is a schematic side view of the oil cooler with a built-in cylinder block as seen from the direction, Fig. 4 is a graph showing the relationship between the dimension C of the gap and the specific heat dissipation of the oil cooler, and Fig. 5 is a conventional built-in cylinder block type. It is a cross-sectional view of an oil cooler. 10 …… Cylinder block, 12 …… Water gallery (engine cooling water passage), 18 …… Oil cooler element,
19 ... Array, 20 ... Overhang member, 34 ... Flow path gap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 53-82938 (JP, A) Actually opened 58-180313 (JP, U) Actually opened 57-132010 (JP, U) Actually opened 57- 180115 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A cylinder in which a plurality of oil cooler elements arranged at intervals and through which engine oil flows, constitute an array, and the array is housed in an engine cooling water passage of a cylinder block. In an oil cooler with a built-in block, the engine is designed to extend from the side wall of the engine cooling water passage toward the array while leaving a flow path gap between the oil cooler and the array to maximize the specific heat dissipation of the oil cooler. An oil cooler with a built-in cylinder block, wherein an overhang member selected according to specifications is mounted on a side wall of the engine cooling water passage.