JPH051536A - Engine oil cooler - Google Patents

Abstract

PURPOSE:To reduce a friction loss by installing an oil warmer in an oil cooler installed in a lubricating oil passage part and in an oil passage bypassing this oil cooler, and setting up an selector means, bypassing oil to the oil warmer side at the time of warming up, thereby allowing oil to have a proper temperature in a short time. CONSTITUTION:An oil passage 8, bypassing an oil cooler 5, is installed in a lubricating oil passage 1 of an engine. This oil passage 8 is one that interconnects an oil filter 4 to a cylinder liner part 6 after bypassing the oil cooler 5, and both oil inlet and outlet parts of an oil warmer 9 warming oil are connected to this oil passage 8, through which oil passing through this bypassed oil passage 8 is fed to the cylinder liner part 6 by way of the oil warmer 9. With this constitution, at the time of warming-up at engine starting, the oil passes through the oil warmer 9 in which it is warmed by exhaust gas. When the oil goes beyond the specified temperature, it passes through the oil cooler 5 and cooled, thus a friction loss is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine oil cooling device for cooling a cylinder with engine oil that lubricates various parts of the engine.

[0002]

2. Description of the Related Art An oil-cooled engine that cools a cylinder with engine oil that lubricates each part of the engine is known. As an example of this, oil cooled through an oil cooler by an oil pump is provided on the outer peripheral surface of a cylinder liner. It is configured such that it is sent to a cooling oil passage to cool the liner with oil, then sent to a head part, a journal part, etc. to lubricate each part of the engine and then returned to an oil pan.

[0003]

In this case, when the engine is started, the temperature of the engine and the oil are low, so that the friction loss tends to increase and the fuel consumption increases, so that the warming-up time is shortened as much as possible. It is desirable to do.

The present invention has been made in view of the above points, and an object of the present invention is to shorten the warm-up operation time to reduce friction loss and improve fuel efficiency.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an oil cooler provided in a lubricating oil passage portion upstream of a cylinder liner portion in an engine oil cooling device for cooling a cylinder with oil that lubricates an engine. An oil passage connected to a lubricating oil passage and bypassing the oil cooler; an oil warmer provided in the oil passage for heating oil; and a switching means for bypassing the oil to the oil warmer side during warm-up operation, The oil warmer is a heat exchanger that heats the oil by the heat of the exhaust gas.

[0006]

[Function] During warm-up operation, the oil bypasses the oil cooler and flows to the oil warmer side, where it is heated by exchanging heat with the exhaust gas in the oil warmer and sent to the cooling oil passage of the cylinder liner. Driving time can be shortened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

An oil pan 2, an oil pump 3, an oil filter 4 and an oil cooler 5 are sequentially provided in a lubricating oil passage 1 of the engine. The oil pump 3 allows the oil in the oil pan 2 to pass through the oil filter 4 and the oil cooler 5 The oil that has been sent to and cooled by the oil cooler 5 is sent to the cylinder liner portion 6. The oil cooler 5 is a water-cooled oil cooler that cools the cylinder head using cooling water.

In the cylinder liner portion 6, a cooling oil groove is formed on the outer circumference of the liner, and a cooling oil passage is formed by this cooling oil groove and the inner peripheral surface of the cylinder bore portion, and the oil cooler is formed in this cooling oil passage. The oil passing through 5 is sent to cool the liner.

After cooling the liner, the oil is used for the engine lubrication part 7 such as the cylinder head part and the journal part.
To lubricate each part of the engine,
Is configured to return to.

In the present invention, the lubricating oil passage 1 of the engine is provided with the oil passage 8 that bypasses the oil cooler 5. The oil passage 8 bypasses the oil cooler 5 and connects the oil filter 4 and the cylinder liner portion 6 to each other. The oil inlet and the oil outlet of the oil warmer 9 for warming the oil are connected to the oil passage 8 to bypass the oil cooler 5. The oil passing through the oil passage 8 is sent to the cylinder liner portion 6 through the oil warmer 9.

A first electromagnetic switching valve 10 is provided at the connection between the oil filter 4, the oil cooler 5 and the oil warmer 9, and the temperature of the oil in the oil pan 2 is detected by a temperature sensor. Is lower than a predetermined temperature, the oil filter 4 and the oil warmer 9 are communicated with each other so that the oil after passing through the oil filter 4 is removed from the oil warmer 9
When the detected temperature exceeds a predetermined temperature, the oil filter 4 and the oil cooler 5 are communicated with each other so that the oil after passing through the oil filter 4 flows only to the oil cooler 5 side.

The exhaust gas inlet of the oil warmer 9 is connected to the exhaust gas passage 13 connecting the exhaust manifold 11 and the exhaust muffler 12 via the second electromagnetic switching valve 14, and the exhaust gas outlet of the oil warmer 9 is connected. Is connected between the electromagnetic switching valve 14 of the exhaust gas passage 13 and the exhaust muffler 12. The second electromagnetic switching valve 14 is configured to interlock with the first electromagnetic switching valve 10, and when the temperature detected by the temperature sensor is equal to or lower than a predetermined temperature, the exhaust manifold 11 and the oil warmer 9 are communicated with each other to form an exhaust gas. Flow through the oil warmer 9 to the exhaust muffler 12, and when the detected temperature exceeds a predetermined temperature, the exhaust manifold 11 and the exhaust muffler 12 are communicated with each other so that the exhaust gas flows directly from the exhaust manifold 11 to the exhaust muffler 12. Is configured.

The oil passing through the oil warmer 9 exchanges heat with the exhaust gas passing through the oil warmer 9 to warm the oil.

The operation will be described below.

When the engine is warmed up when the temperature of the oil is below a predetermined temperature, the oil filter 4 and the oil warmer 9 communicate with each other, and the oil flow is from the oil pan 2 to the oil filter 4 to the oil warmer 9 to the cylinder. Liner section 6 →
Engine lubrication part 7 → oil pan 2. On the other hand, the flow of the exhaust gas is such that the exhaust manifold 11 and the oil warmer 9 communicate with each other, and the exhaust gas flows from the exhaust manifold 11 to the oil warmer 9 to the exhaust muffler 12. Therefore,
In the oil warmer 9, the oil heats up by exchanging heat with the exhaust gas. Since the warmed oil cools the cylinder liner portion 6, the cylinder liner can reach an appropriate temperature in a short time without being overcooled.

When the engine temperature rises and the oil temperature exceeds a predetermined temperature, the oil filter 4 and the oil warmer 9 are cut off from each other, and the oil filter 4 and the oil cooler 5 are connected to each other, so that the oil flow. Is the oil pan 2, the oil filter 4, the oil cooler 5, the cylinder liner portion 6, the engine lubricating portion 7, and the oil pan 2.
On the other hand, the flow of exhaust gas is the exhaust manifold 1
The communication between 1 and the oil warmer 9 is cut off, and the exhaust manifold 11 and the exhaust muffler 12 directly communicate with each other, so that the exhaust manifold 11 → the exhaust muffler 12 is obtained. In this way, when the temperature of the engine rises, the oil cooled through the oil cooler 5 is sent to the cylinder liner portion 6 so that the temperature of the cylinder liner can be properly maintained.

[0018]

As described above, according to the present invention, during warm-up operation of the engine, the oil is warmed by the oil warmer, which cools the cylinder liner portion.
The proper temperature can be reached in a short time without overcooling the cylinder liner, and after the engine temperature rises, the oil cooled by the oil cooler is sent to the cylinder liner section, so the cylinder liner can be properly cooled. .. In this way, friction loss can be reduced and fuel consumption can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing flows of engine oil and exhaust gas in the present invention.

[Explanation of symbols]

 1 Lubricating Oil Path 2 Oil Pan 3 Oil Pump 4 Oil Filter 5 Oil Cooler 6 Cylinder Liner Section 7 Engine Lubrication Section 8 Detour Oil Path 9 Oil Warmer 10 First Electromagnetic Switching Valve 11 Exhaust Manifold 12 Exhaust Muffler 13 Exhaust Gas Flow Path 14th 2 electromagnetic switching valve

Claims (1)

Claim: What is claimed is: 1. An oil cooler for an engine, which cools a cylinder with oil for lubricating an engine, comprising: an oil cooler provided in a lubricating oil passage portion upstream of a cylinder liner portion; An oil passage connected to a passage for bypassing the oil cooler, an oil warmer provided in the oil passage for warming the oil, and a switching means for bypassing the oil to the oil warmer side during warm-up operation, An oil cooling device for an engine, which is a heat exchanger that heats oil by the heat of exhaust gas.