JPS6019904A - Lubricating oil temperature control device in water-cooled engine - Google Patents

Abstract

PURPOSE:To enhance the warm-up ability of an engine upon low temperature and low load running of an engine, and as well to prevent the temperature rise of oil upon high temperature and high load running of the engine, by arranging a drainage of engine cooling water adjacently to the oil storing section of an oil pan. CONSTITUTION:A water temperature regulating valve 29 for checking the outlet flow of cooling water from a water jacket 25 formed in a cylinder head 22 when the temperature of cooling water is below a predetermined temperature upon, for example, starting of the engine, is disposed in the outlet side of the water jacket 25. An oil pan 34 is of a triple cylinder structure composed of an outer cylinder 35, an intermediate cylinder 36 and an inner cylinder 37, the outer cylinder 36 being connected with the intermediate clyinder 36 by means of an inner bottom 38 to form an oil storing section 39. Further, the inetermediate cylinder 36, the inner cylinder 37, the inetermediate bottom 38 and an outer bottom 42 define therebetween a drainage 43 for cooling water, which is adjacent to the oil storing section 39. The temperature of cooling water flowing through the drainage 43 is always controlled to be at a predetermined temperature so that lubricating oil is heated upon low temperature and low load running of the engine, but is cooled upon high temperature and high load running thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating oil temperature control device for a water-cooled engine suitable for use in outboard motors and the like.

Conventionally, the cooling water is circulated in the water jacket, and the cooling water is directed to the water jacket as a lubricating oil temperature control device for a water-cooled engine, which has a lubricating oil storage area in the oil tube. It has been proposed that a water supply passage for pumping water under pressure is arranged adjacent to an oil pan. According to this lubricating oil temperature control device, when the engine is at high temperature and under high load, the cooling water cools the lubricating oil in the oil pan to prevent the oil temperature from rising.

However, in the conventional lubricating oil temperature control device described above, when the engine is at a low temperature and under low load, there is a risk that the cooling hydraulic power may overcool the lubricating oil, which may impede the smooth warming up of the engine.

An object of the present invention is to keep the lubricating oil in the oil 57 at an appropriate temperature, improve warming performance during low temperature and low load operation, and prevent oil temperature rise during high temperature and high load operation.

In order to achieve the above objective, the lubricating oil temperature side of the water-cooled engine (I [41) related to 5 engines + 1 Jj is installed. It is something.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, and FIG. 2 is a side view showing a partially cutaway main part of FIG.

A casing 14 is supported on a stern plate 11 of the hull via a clamp bracket 12 and a swivel racket 13. At the top of the casing 14.

An engine 16 is mounted via a plate-shaped intermediate member 15. The output of the engine 16 is transmitted to the propeller 19 via a drive shaft 17 vertically installed in the casing 14 and a forward/reverse switching device 18, making the propeller 19 rotatable.

The engine 16 is a water-cooled four-stroke two-cylinder engine, and its outer shell is formed by a cylinder case 2o, a crankcase 21, and a cylinder radiator 22. A pair of upper and lower cylinders are arranged horizontally in the cylinder case 2o.
A piston 23 is arranged in each cylinder. Further, in the crank chamber formed by the cylinder case 2o and the crank case 21, a lever 5'''#Qfi 24 is placed vertically, and the upper end of the drive shaft 17 is connected to the lower end of the crankshaft 24.

A water jacket 25 is formed in the cylinder case 20 and the cylinder head 22, and allows cooling water pumped by a water pump 26 to circulate therein. The water pump 26 is arranged in the casing 14 and pumps up outside water as cooling water through a water conduit pipe 27 by rotating an impeller fixed to the middle part of the drive shaft 17, and pumps up outside water as cooling water through a water supply pipe 28. The water can be fed under pressure to the water jacket 25 side. here,
On the outlet side of the water jacket 25, there is a water temperature control valve 29 that prevents the cooling water from flowing out from the water jacket 25 during startup, etc. when the cooling water temperature is below a certain temperature. is installed.In addition, water supply pipe 2
8 is spaced apart from the outer wall surface of the oil pan 34 so that the temperature of the cooling water flowing through the water supply pipe 28 does not affect the temperature of the lubricating oil inside the oil pan 34, which will be described later.

A cam shaft 3 is provided in the cam chamber formed by the cylinder head 22.
0 is placed vertically, and an oil pump (not shown) is connected to the lower end of the camshaft 30.

Further, a drive wheel 31 fixed to the crankshaft 24,
A belt 3 is attached to the driven wheel 32 fixed to the camshaft 30.
3 is wound around so that the camshaft 30 and the oil pump can be driven by the rotation of the crank @24.

An oil tube 34 is suspended and fixed at the lower center of the intermediate member 150. The lubricating oil in the oil pan 34 is pumped up by the operation of the oil pump, and is transferred to the crankshaft 20 through an oil path formed in the cylinder case 20.
The shaft swivel and the shaft of the camshaft 30 are lubricated, and after being lubricated, the oil is returned to the oil pan 34.

Here, as shown in FIG. 2, the oil pan 34 and the outer cylinder part 35. A substantially triple cylindrical structure consisting of an intermediate cylindrical portion 36 and a cylindrical portion 37 is formed. The outer cylindrical portion 35 and the intermediate cylindrical portion 36 are connected by a middle bottom portion 38 to form an oil 1[v, container portion 39]. The cylindrical portion 37 is located approximately at the center of the oil pan 34 and forms an exhaust passage 40. Exhaust passage 4
0 opens into the expansion chamber 41 within the casing 14.

Further, the outer cylindrical portion 35 and the inner cylindrical portion 37 are connected by an outer bottom portion 42 located outside the middle bottom portion 38.

Therefore, the intermediate cylinder part 36, the inner cylinder part 37, the middle bottom part 38, and the outer bottom part 42 are connected to the oil storage part 3 of the oil pan 34.
A cooling water drainage passage 43 adjacent to 9 is formed. An inlet side 43A of the drain passage 43 is connected to an outflow water channel 44 that continues to the outlet side of the control valve 49, and an outlet opening 43B of the drain passage 43 opens into the expansion chamber 41.

Next, the operation of the above embodiment will be explained.

When the engine 16 is operating, the oil pump operates,
Lubricating oil contained in the oil storage portion 39 of the oil pan 34 is circulated to lubricate the valley lubrication necessary parts. Further, the exhaust gas of the engine 16 is routed through the exhaust passage 40. Expansion chamber 41
It is then discharged to the outside. Furthermore, by the operation of the water pump 26, outside water as cooling water is pumped up and supplied to the water jacket 25 of the engine 16 via the water supply pipe 28.

Here, due to the existence of the regulating valve 25, the cooling water discharged from the water jacket 25 is always adjusted to a constant state regardless of the temperature state of the usage environment and the operating state of the engine 16. That is, the cooling water flowing through the drain passage 43 is always controlled at a predetermined, substantially constant temperature.

Therefore, when the engine 16 is operated at low temperature and under low load, the temperature of the cooling water flowing through the drain passage 43 is higher than the temperature of the lubricating oil in the oil pan 34, and the cooling water flows into the oil pan 34. To improve warming performance by heating lubricating oil and adjusting the oil temperature to an appropriate temperature.

On the other hand, when the engine 16 is operated at high temperature and high load.

The temperature of the cooling water flowing through the drainage passage 43 reaches 734.
The cooling water cools the lubricating oil in the oil pan 34, keeping the oil temperature at an appropriate temperature and preventing the oil temperature from rising.

In the above embodiment, a case has been described in which the temperature of the cooling water discharged from the water jacket 25 is controlled to a predetermined temperature by the presence of the regulating valve 29. Generally, the water temperature is higher than the lubricating oil temperature during low-temperature, low-load operation, and is lower than the lubricating oil temperature during high-temperature, high-load operation. Therefore, in one aspect of the present invention, it is possible to bring the lubricating oil in the oil pan to an appropriate temperature using cooling water after cooling the engine, without necessarily providing a water temperature control valve on the outlet side of the water jacket.

As described above, in the lubricating oil temperature control device for a water-cooled engine according to the present invention, the cooling water drainage passage communicating with the water jacket is arranged adjacent to the oil storage portion of the oil pan. Therefore, when the engine is operating at low temperature and low load, the cooling water flowing out from the water jacket after cooling the engine warms the lubricating oil in the oil tank, bringing the oil temperature to an appropriate temperature.

Improves warmth. Furthermore, during high-temperature, high-load operation of the engine, the cooling water after cooling the engine cools the lubricating oil in the oil pan, brings the oil temperature to an appropriate temperature, and prevents the oil temperature from rising.

[Brief explanation of drawings]

FIG. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, and FIG. 2 is a side view showing a main part of FIG. 1 with a portion cut away. - 16...Engine%25...Water jacket, 34°
...Oil pan, 3゛9...Oil storage section, 43...
・Drainage passage. Figure 1 Figure 2

Claims (1)

[Claims] (1) In a lubricating oil temperature control device for a water-cooled engine that is capable of circulating cooling water in a water jacket and storing lubricating oil in an oil pan, the cooling water drainage passage communicating with the water jacket is connected to the oil pan. A lubricating oil temperature control device for a water-cooled engine, characterized in that it is disposed adjacent to an oil storage portion of a pan.