JP2748772B2 - Engine oil cooler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cooler device built in an engine.

[0002]

2. Description of the Related Art In a conventional oil cooler device incorporated in an engine, a cylinder block 2 and an oil cooler chamber cover 3 as shown in FIG.
The cooling water channel flowing into the oil cooler chamber 4 is usually provided immediately after the water pump 13.
In this case, the water path immediately after the water pump is generally divided into a water path on the cylinder block 2 side and a water path on the oil cooler 10 side.
The cooling water of the engine 1 that has exited from the water pump 3
Further in front of the engine 1 (in the direction of arrow F), there are two branches, an inlet channel 16 to the water jacket 17 and an inlet channel 8 to the oil cooler chamber 4, and flow into the water jacket 17 and the oil cooler chamber 4, respectively. . After cooling the oil cooler element 5, the cooling water flowing into the oil cooler chamber 4 enters the water jacket 17 from the outlet 9 to the water jacket at the rear of the oil cooler chamber 4, and merges with the cooling water in the water jacket 17. I do.

In the oil cooler devices disclosed in Japanese Utility Model Laid-Open Publication No. 57-81434 (see FIG. 3) and Japanese Utility Model Publication No. Sho 62-21688 (see FIG. 4), the cooling water discharged from the water pump is first discharged. The cooling water flows into the oil cooler chamber 4, cools the oil cooler element 5, and is introduced into the water jacket 17.

[0004]

In the prior art, in an oil cooler of the type shown in FIG. 2, the cooling water flows directly into the water jacket 17 from the inlet water passage 16, so that the cylinder liner 6 is sufficiently cooled. But
Although the cooling water directly flows into the oil cooler chamber 4 from the inlet water channel 8, the flow path resistance is strong because the oil cooler element 5 is provided in the chamber. And more cooling water flows into the water jacket 17 side than the oil cooler side. Further, when the flow velocity of the water flow in the water jacket inlet channel 16 flowing into the water jacket 17 increases, the oil cooler chamber inlet channel 8 that is divided into two branches from the pump rear chamber 14 and the water jacket inlet channel 16.
At the branch point, water to enter the oil cooler chamber 4 is sucked out by the water flow entering the water jacket 17 and flows into the water jacket 17. As a result, the water flow in the oil cooler chamber 4 reverses, and the warmed cooling water in the water jacket 17 is discharged from the outlet 9 to the water jacket 17 from the oil cooler chamber 4 at the rear of the oil cooler chamber 4. And the normal flow and the reverse flow are mixed in the oil cooler chamber in this way, and the cooling efficiency of the oil cooler 10 is reduced.

In the oil cooler disclosed in Japanese Utility Model Laid-Open No. 57-81434 and Japanese Utility Model Publication No. 62-21688, all of the cooling water sent from the water pump is supplied to the oil cooler chamber 4. The oil cooler 10 is sufficiently cooled because of the direct inflow, but the cooling water warmed through the oil cooler 10 flows into the water jacket 17 so that the cooling efficiency of the cylinder liner 6 is inferior. There is a problem that this is likely to be a factor.

[0006] In view of the above problems, in the present invention,
It is an object of the present invention to provide an oil cooler device capable of sufficiently cooling an oil cooler element without lowering the cooling efficiency of a cylinder liner.

[0007]

In order to achieve the above object, according to the present invention, there is provided an oil cooler along a longitudinal direction of the cylinder block in an oil cooler chamber formed by the cylinder block and an oil cooler chamber cover. In the oil cooler structure in which the element is disposed, the water passage of the oil cooler chamber and the water passage of the water jacket of the engine are completely separated, and the passage of the cooling water that has exited the water pump is bifurcated from the water pump rear chamber. An oil cooler device for an engine is provided which branches into an inlet water path to a water jacket and an inlet water path to the oil cooler chamber, and communicates from an oil cooler chamber outlet to a water pump front chamber by a bypass pipe.

[0008]

The cooling water discharged from the water pump into the rear chamber of the water pump is divided into two directions, that is, the water jacket inlet water channel and the oil cooler chamber inlet water channel. After flowing through the oil cooler chamber, it flows out of the oil cooler chamber outlet, flows through the bypass pipe, flows into the water pump front chamber, enters the oil pump again, and circulates the cooling water. In the system, the cooling water is forcibly circulated by the discharge pressure and the suction pressure of the water pump, thereby improving the cooling efficiency.

[0009]

1 is a schematic longitudinal sectional view of a cylinder block according to an embodiment of the present invention. In the figure, the same parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description will be omitted. In the engine 1, an oil cooler chamber 4 is formed by the cylinder block 2 and the oil cooler chamber cover 3, and an oil cooler element 5 is disposed therein. A chain case 15 containing a timing chain (not shown) and the like is provided in front of the engine 1 (indicated by an arrow F) adjacent to the cylinder block 2, and a water pump 13 is disposed in contact with the chain case 15. The cooling water is sent out into the water jacket 17 and the oil cooler chamber 4 of the engine.

A water pump 13 has an inlet water passage 16 to a water jacket 17 in a rear chamber 14 of the water pump.
And into the inlet water passage 8 to the oil cooler chamber 4 and bifurcate, into which cooling water flows directly. The cooling water flowing into the water jacket 17 cools around the cylinder bore 6. The cooling water that has entered the oil cooler 10 is
After cooling the oil cooler element 5, the oil cooler 10 passes through a bypass pipe 11 provided outside the oil cooler chamber 4 from an oil cooler chamber outlet 7 provided at a rear portion of the oil cooler 10, enters the water pump front chamber 12, and is again water-cooled. The water is sent out to the water pump rear chamber 14 by the pump 13.

[0011] Oil cooler chamber 4 and water jacket 1
7 is blocked by the side wall of the cylinder block 2 except for the inlet water channels 8 and 16 to each other.
There is no communication path such as the outlet 9 from the oil cooler chamber 4 to the water jacket 17 as shown at 4 to 4, and each forms a completely different flowing water channel. With the above configuration, the oil cooler chamber 4 is also provided in the water jacket 17.
Cooling water from the water pump 13 flows directly into the
The oil cooler 10 flows into the water jacket 17 with the discharge pressure of the water pump 13 and the suction pressure of the water pump 13 to form independent cooling systems. As a result, there is no possibility that one of them adversely affects the cooling of the other as in the case of the above-described prior art, and each is sufficiently cooled,
The best cooling efficiency can be achieved. In particular, in the oil cooler chamber 4, both the discharge pressure and the suction pressure of the water pump 13 can be used, and the forced circulation of the cooling water in the oil cooler chamber 4 is performed.

[0012]

According to the present invention, the following effects can be obtained. (1) By providing a separate cooling water circulation system for the oil cooler chamber that is separate from the cooling water circulation system in the water jacket,
It is possible to forcibly circulate the cooling water in the oil cooler chamber without adversely affecting the cooling of the cylinder bore, thereby increasing the amount of cooling water and the flow velocity of the oil cooler, thereby enabling sufficient cooling and improving cooling efficiency. Go up.

(2) High-speed running performance is improved by lowering the oil temperature. (3) By using the bypass pipe, the structure of the engine block does not become complicated, the work is easy, and the cost is advantageous.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal cross-sectional view of a cylinder block according to an embodiment of the present invention.

FIG. 2 is a schematic longitudinal sectional view of a cylinder block of a conventional oil cooler device.

FIG. 3 is a longitudinal sectional view of another example of a conventional oil cooler device in a longitudinal direction of a cylinder block.

FIG. 4 is a longitudinal cross-sectional view of still another example of a conventional oil cooler device in a cylinder block longitudinal direction.

[Explanation of symbols]

 2 ... Cylinder block 3 ... Oil cooler chamber cover 4 ... Oil cooler chamber 5 ... Oil cooler element 7 ... Oil cooler chamber outlet 8 ... Oil cooler chamber inlet water passage 9 ... Outlet from oil cooler chamber to water jacket 10 ... Oil cooler 11 ... Bypass pipe 12 ... Water pump front chamber 13 ... Water pump 14 ... Water pump rear chamber 16 ... Water jacket inlet channel 17 ... Water jacket

Claims (1)

(57) [Claims] An oil cooler chamber (4) formed by a cylinder block (2) and an oil cooler chamber cover (3).
In an oil cooler (10) structure in which an oil cooler element (5) is arranged along the longitudinal direction of the cylinder block (2), a water passage of the oil cooler chamber (4) and a water jacket (1) of the engine (1). The water channel of (17) is completely separated, and the passage of the cooling water that has exited from the water pump (13) is bifurcated from the water pump rear chamber (14) to the inlet water channel (16) to the water jacket (17). A branch is made to an inlet water channel (8) to the oil cooler chamber (4), and a communication from the oil cooler chamber cooling water outlet (7) to the water pump front chamber (12) is communicated by a bypass pipe (11). Engine oil cooler device.