JPH04262011A - Oil cooler device for engine - Google Patents

Abstract

PURPOSE:To sufficiently cool an oil cooler element without deteriorating the cooling efficiency by opening an outlet passage leading to an oil cooler chamber toward the venturi-shaped throat part of an inlet passage to a water jacket. CONSTITUTION:An oil cooler element 2 is arranged along the longitudinal direction of a cylinder block 3 in an oil cooler chamber 5 formed from the cylinder block 3 and an oil cooler chamber cover 1. The inlet passage 17 to a water jacket 14 for the cooling liquid discharged from a water pump is formed to a venturi shape in the front part of the cylinder block 3. An outlet passage 13 formed in the front part of the oil cooler chamber 5 is opened towards the venturi shaped throat part 4 of the inlet passage 17. Accordingly, a large quantity of cooling liquid circulates between the oil cooler chamber 5 and the water jacket 14, and the cooling with high efficiency can be carried out for the inside of the water jacket 14 and the inside of the oil cooling chamber 5.

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 into an engine.

0002

[Prior Art] In a conventional oil cooler device built into an engine, the engine coolant that leaves the water pump first passes through the oil cooler chamber, cools the oil cooler sufficiently, and then flows into the engine water jacket and circulates. There are many things that are done. However, in these systems, the structure of the flow path through which the coolant passes is complicated, and even if the oil cooler can be sufficiently cooled, the engine bore tends to be insufficiently cooled.

[0003] In order to eliminate the above-mentioned drawbacks,
No.-81433 and Japanese Utility Model Application Publication No. 57-81434 have been proposed. FIG. 3 shows a cross-sectional view of the former device, and FIG. 4 shows a cross-sectional view of the latter device. As shown in each figure, the oil cooler device 20 is built into the engine 30 and forms an oil cooler chamber 5 separated from the water jacket 14 by a partition member 8. A cooler element 2 is provided. The coolant pumped by a water pump (not shown) enters the oil cooler chamber 5 from the front side of the engine (arrow F) through the cylinder block front end opening 15, cools the oil element 2, and then enters the partition member 8. The water enters the water jacket 14 through the circulation hole 9 provided in the cylinder bore 7 and cools the cylinder bore (cylinder liner) 7.

[0004] In addition to the above-mentioned format, the following format has been prototyped. This is shown in Figure 5.
The coolant is pumped by a water pump (not shown) from the front side of the engine to the front end opening 15 of the cylinder block as indicated by arrow F, and flows into the water jacket 14 side and the oil cooler chamber 5 side at the inlet, dividing the coolant into the water jacket 14 side and the oil cooler chamber 5 side. The cylinder bore 7 and the oil cooler element 2 are cooled simultaneously and in parallel.

[0005]

[Problems to be Solved by the Invention] In the above-mentioned prior art, the one of the type shown in FIG. enters the water jacket 14 through each flow hole 9 as shown by the arrows. On the other hand, in the case shown in FIG.
As a result, the flow of the coolant that has flowed backward from the rear of the engine to the front in the duct as shown by the arrow in the figure enters the water jacket 14, and the cylinder bore 7 is cooled.

According to the above mechanism, due to the difference in the flow of the coolant, the front part of the engine is well cooled in the case of FIG. 3, and the rear part of the engine is well cooled in the case of FIG. However, in the latter case, there is a problem in that the cooling efficiency for the front cylinder bore is poor and it is likely to cause seizure.

Furthermore, in the type shown in FIG. 5, the cylinder liner 7 is sufficiently cooled because the cooling fluid flows directly into the water jacket 14, but the oil cooler chamber 5
Although the coolant flows directly into the oil cooler chamber from the inlet, there is strong flow resistance due to the presence of the oil cooler element 2 inside the chamber.For this reason, the coolant entering from the inlet has difficulty entering smoothly into the oil cooler chamber, causing the coolant to flow directly into the oil cooler chamber. Most of the water flows into the water jacket 14 side. In addition, in the communication hole 16 communicating with the water jacket 14 at the rear of the oil cooler chamber 5, there is also a flow flowing from the water jacket 14 into the oil cooler chamber 5, opposite to the flow flowing out from the oil cooler chamber 5 to the water jacket 14. The flow inside the oil cooler chamber 5 is disturbed and weakened, and the flow does not flow uniformly toward the rear of the oil cooler chamber, which reduces the cooling efficiency of the oil cooler device 20. descend.

[0008] In view of the above problems, in the present invention,
It is an object of the present invention to provide an oil cooler device that can sufficiently cool an oil cooler element without reducing the cooling efficiency of a cylinder bore.

[0009]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, an oil cooler element is disposed along the longitudinal direction of the cylinder block in the oil cooler chamber formed by the cylinder block and the oil cooler chamber cover. In the oil cooler structure built into the installed engine, an inlet passage for the coolant discharged from the water pump to the water jacket is formed in a venturi shape at the front part of the cylinder block, and is provided at the front part of the oil cooler chamber. The coolant exit passage from the oil cooler chamber is
Both of the passages are arranged so as to open toward a venturi-shaped throat portion of the inlet passage to the water jacket, and a cooling liquid is provided to the oil cooler chamber communicating with the water jacket at the rear of the oil cooler chamber. To provide an oil cooler device for an engine, characterized in that an inlet passage is provided.

0010

[Operation] The cooling liquid discharged from the water pump flows into the water jacket from the cylinder block opening using the entire head of the water pump. At this time, part of the coolant in the water jacket enters the oil cooler chamber from the coolant inlet to the oil cooler chamber, and the coolant in the oil cooler chamber enters the venturi pipe throat at the coolant outlet of the oil cooler chamber. It is sucked out by strong suction and enters the water jacket. This allows a large amount of cooling fluid to circulate between the oil cooler chamber and the water jacket, and highly efficient cooling is performed for both the water jacket and the oil cooler chamber.

[0011]

[Embodiment] An embodiment of the present invention will be explained based on the drawings. FIG. 1 shows a sectional view of an oil cooler device according to a first embodiment, and parts common to those in FIGS. 3 to 5 described above are designated by the same numbers.

As shown in the figure, an oil cooler device 20 built into an engine 30 is installed in an oil cooler chamber 5 formed by a cylinder block 3 and an oil cooler chamber cover 1, and located along a longitudinal axis X-X of the cylinder block 3. An oil cooler element 2 is arranged along. In the figure, arrow F indicates the forward direction of the engine 30.

A cylinder block opening 15 is provided at the front end of the cylinder block 3 as an inlet for the engine coolant discharged from a water pump (not shown) into the water jacket 14. The entrance passage has a venturi shape and a narrow throat portion 4 is formed.

An inlet passage 12 for the coolant into the oil cooler chamber 5 is opened in the wall surface of the cylinder block 3 so as to communicate with the water jacket 14 at the rear of the oil cooler chamber, and the coolant in the water jacket 14 flows through this inlet. It flows into the oil cooler chamber 5 through the passage 12, flows in the direction shown by the arrow in the figure, cools the oil cooler element 2, and flows out through the coolant outlet passage 13 opened at the front of the oil cooler chamber 5. . At this time, the coolant outlet passage 13 of the oil cooler chamber is approximately perpendicular to the water jacket inlet passage of the cooling water of the cylinder block 3, and forms the narrowest passage among the water jacket inlet passages 17. Venturi-shaped throat part 4
It is open facing.

With the above configuration, the water is pumped by the water pump, and the water jacket 1 is fed from the throat portion 4.
The flow of the coolant flowing into the oil cooler chamber 5 is throttled at the throat section 4, resulting in a negative pressure in this section. Introduced into the jacket 14. This suction effect is due to the fact that the cylinder block opening 15 is close to the water pump, so the discharge pressure of the water pump is also high.
In addition, since the entire head of this water pump is used to flow the cooling liquid into the water jacket inlet passage 17, a high negative pressure is generated in the throat portion 4, and this negative pressure causes the oil cooler chamber cooling chamber outlet passage 13 to A larger amount of coolant is sucked out, and thereby a larger amount of coolant is circulated between the oil cooler chamber 5 and the water jacket 14 as indicated by the arrows in the figure.

According to the above method, the coolant flowing in the water jacket does not first enter the oil cooler chamber 5 and then enter the water jacket as in the conventional example, but directly flows into the water pump from the beginning. Because the water flows into the water jacket 14 under the dynamic pressure of
Furthermore, in the oil cooler device 20, the strong suction action of the throat portion 4 at the coolant outlet promotes the flow of the coolant, increasing the circulating flow rate of the coolant in the oil cooler chamber, and improving the cooling effect.

FIG. 2 shows a second embodiment. This has a rib 6 attached to the rear inlet 12 of the coolant into the oil cooler chamber 5, so that the dynamic pressure of the flow of the coolant acts on this inlet. Other parts are the same as those in FIG. As a result, dynamic pressure acts on the rear inlet of the oil cooler chamber to actively push the coolant, and negative pressure acts on the front outlet to suck out the coolant, further increasing the flow rate of the coolant circulating in the oil cooler chamber. This increases the cooling efficiency even further.

[0018]

By carrying out the present invention, it becomes possible to flow the cooling liquid into the water jacket by utilizing the entire head of the water pump, thereby improving the cooling efficiency of the cylinder bore. In addition, for the oil cooler chamber, the inlet and outlet of the coolant are fixed, making the flow uniform, and by utilizing the negative pressure effect of the venturi, the circulation flow rate in the oil cooler chamber is increased without reducing the cooling efficiency of the cylinder bore. Therefore, the efficiency of the oil cooler device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an engine oil cooler device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an oil cooler device according to a second embodiment.

FIG. 3 is a longitudinal sectional view of one oil cooler device according to the prior art.

FIG. 4 is a longitudinal sectional view of another oil cooler device according to the prior art.

FIG. 5 is a longitudinal sectional view of yet another oil cooler device according to the prior art.

[Explanation of symbols] 1...Oil cooler chamber cover 2...Oil cooler element 3...Cylinder block 4...Throat portion 5...Oil cooler chamber 12...Inlet passage for coolant to the oil cooler chamber 13...Cooling liquid from the oil cooler chamber Exit passage 14...Water jacket 17...Water jacket inlet passage

Claims (1)

[Claims] Claim 1: An oil cooler structure built into an engine, in which an oil cooler element is disposed along the longitudinal direction of the cylinder block in an oil cooler chamber formed by the cylinder block and the oil cooler chamber cover,
An inlet passage for the coolant discharged from the water pump to the water jacket is formed in a venturi shape at the front part of the cylinder block, and an outlet passage for the coolant from the oil cooler chamber provided at the front part of the oil cooler chamber, Both of the passages are arranged so as to open toward a venturi-shaped throat portion of the inlet passage to the water jacket, and a cooling liquid is provided to the oil cooler chamber communicating with the water jacket at the rear of the oil cooler chamber. An oil cooler device for an engine, characterized in that an inlet passage is provided.