JPH03100311A - Lubricating device of internal combustion engine - Google Patents

Abstract

PURPOSE:To promote an increase of lubricating oil temperature by circulating cooling water, when an engine is not yet warmed, to an oil heater in which the cooling water serves as a heat source. CONSTITUTION:An oil heater 18, formed of cooling water circulating metal pipes, is arranged in an oil tank with cooling water introducing and returning passages 19 and 20 connected. Here in a condition such as just after a cold start with a cooling water temperature lower than a predetermined thermostat valve opening temperature, by closing a radiator outlet passage 26 with the main valve of a thermostat valve 24 while by opening a bypass valve, cooling water is circulated in a side of a bypass passage 25. While simultaneously, since the cooling water returning passage 20 communicates with a suction port 23a of a water pump 23, the cooling water is circulated in the oil heater 18. In this way, the cooling water, heated to a high temperature in a water jacket 21, is supplied to the oil heater 18 to positively heat engine lubricating oil. Accordingly, a lubricating oil temperature can be promptly increased after a cold start.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a lubricating system for an internal combustion engine, particularly a dry sump type lubricating system in which an oil tank is provided outside a crank chamber.

Conventional Technology Most automotive internal combustion engines in use use a so-called wet sump lubricating system, in which lubricating oil is stored in an oil pan that covers the lower part of the crank chamber, and an oil pump sucks it up and pumps it to various parts. This wet sump system increases the overall height of the internal combustion engine, and problems have been pointed out such as the crankshaft colliding with the oil surface and creating resistance when turning.

For this reason, dry sump type lubrication devices have traditionally been used in some parts (see, for example, the ``Ferrari Testrotsusa Technical Manual'').

This system has an oil tank that stores lubricating oil outside the crank chamber, and an oil pressure pump that pumps the lubricating oil from the oil tank to various parts of the internal combustion engine, and an oil pressure pump that pumps the lubricating oil that has flowed down to the lower part of the crank chamber. It is equipped with an oil scavenge pump that discharges the oil into the oil tank. In addition, the lubricating oil discharged from the bottom of the crank chamber to the oil tank contains
Since it is a mixture of air and blow-by gas, gas-liquid separation is usually performed within the oil tank.

Problems to be Solved by the Invention In the dry sump type lubrication device as described above,
Because the lubricating oil path becomes longer and the oil tank capacity increases due to gas-liquid separation, the amount of lubricating oil required is much larger than that of a wet sump system.
Almost double.

Therefore, after a cold start, the lubricating oil temperature rises very slowly, resulting in an increase in friction loss, which in turn causes deterioration in fuel efficiency and deterioration in exhaust emissions during warm-up.

Means for Solving the Problems Therefore, the present invention provides an oil tank for storing lubricating oil, an oil pressure pump for pumping the lubricating oil from the oil tank to various parts of the internal combustion engine, and an oil pressure pump for transporting the lubricating oil that has flowed down to the lower part of the crank chamber. In a dry sump type lubricating system that is equipped with an oil scavenge pump that discharges oil into an oil tank, an oil heater that uses cooling water as a heat source is installed at an appropriate position in the lubricating oil path, and the cooling water flow path is connected to a radiator. The oil heater is characterized in that cooling water is circulated through the oil heater when it is not warmed up through a thermostatic valve that switches between the oil heater side and the bypass passage side.

Operation When the internal combustion engine is not warmed up, the thermostatic valve directs the cooling water flow path to the bypass passage side, suppressing heat radiation in the radiator. At the same time, a portion of the high temperature cooling water exiting the internal combustion engine is circulated and supplied to the oil heater. This circulation of cooling water actively heats the lubricating oil.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment in which a lubricating device according to the present invention is applied to a V-type six-cylinder internal combustion engine I, which is equipped with an oil pressure pump 2 and an oil scavenge pump 3 inside the internal combustion engine I. A separate oil tank 5 is provided outside the crank chamber 4. Incidentally, the oil pressure pump 2 and the oil scavenge pump 3 are usually arranged coaxially, and are both driven simultaneously by the engine output.

The oil tank 5 and the suction side of the oil pressure pump 2 are connected by an oil introduction passage 6. And the oil pressure pump 2 discharge side is the oil filter 7
It communicates with the main gear rally 9 of the cylinder block 8 through the cam bearing 11 on the cylinder head 10 side, the hydraulic valve lifter 12, or the main bearing 13.
Lubricating oil is pumped to various parts such as the crankshaft and crank bin part 14.

Further, lubricating oil used in various parts of the engine flows down to the lower part of the crank chamber 4 and is collected there, and an oil strainer 15 on the suction side of the oil scavenge pump 3 is disposed here.

The discharge side of the oil scavenger pump 3 is connected to the oil tank 5 through an oil discharge passage 16.

Therefore, the lubricating oil collected in the lower part of the crank chamber 4 is immediately discharged into the oil tank 5 by the oil scavenge pump 3 which is constantly driven. Note that a part of the oil tank 51 and the crank chamber 4 are communicated with each other through a blow-by gas passage (7).

Further, inside the oil tank 5, an oil heater I8 made of a metal pipe for flowing cooling water is disposed. A cooling water introduction passage 19 and a cooling water return passage 20 are connected to this oil heater I8, and as described later,
Cooling water that becomes hot stagnation is circulated only when the engine is not warmed up.

FIG. 2 schematically shows the configuration of a cooling system for the internal combustion engine I including the oil heater I8, in which 2I is a water jacket, 22 is a radiator, 23 is a water pump, and 24 is a thermostatic valve. This embodiment has a so-called bottom bypass system in which the thermostatic valve 24 is located on the suction side of the water pump 23, and when the temperature is low, the bypass passage 25 is connected to the suction port 2 of the water pump 23.
3a, and when the temperature is high, the radiator outlet 1 passage 2
6 communicates with the suction boat 23a of the water pump 23. That is, at low temperatures, cooling water circulates through the bypass passage 25 without passing through the radiator 22, promoting warm-up.

Here, the cooling water introduction passage 19 of the oil heater I8 is
The tip thereof is connected to the discharge side of the water pump 23, and the tip of the cooling water return passage 20 can communicate with the suction side of the water pump 23 via the bypass passage 25 side of the thermostat valve 24.

As shown in FIG. 3, the thermostatic valve 24 includes a housing 31 fixed in a passage, and a
Wax case 3 supported by 1 via shaft 32
3, a disk-shaped main valve 34 which is integrally attached to the wax case 33 and opens and closes the radiator outlet passage 26, and a cylindrical first valve 34 which is also attached to the wax case 33 and which opens and closes the bypass passage 25. A second bypass valve 35, 36 and a return spring 37 are provided. Above 1. 2nd bypass valve 35.36
In each case, communication holes 38 and 39 are opened in the cylindrical wall in the form of windows, and the first cylindrical surface has a cylindrical surface. By moving each bypass valve 35.36 into and out of the second valve port 40.41, its passage area changes. Here, the communication hole 38
．． The opening area of 39 is set larger in the first bypass valve 35 than in the second bypass valve 36.

The suction boat 23a of the quarter pump 23 is in communication between the main valve 34 and the first bypass valve 35, and the tip of the cooling water return passage 20 is between the first bypass valve 35 and the second bypass valve 36. is connected to.

Now, in the construction engine, when the cooling water temperature is lower than the predetermined thermostat valve opening temperature (for example, around 70 to 80°C), such as immediately after a cold start, the main valve 34 of the thermostatic valve 24 closes as shown in Fig. 3. closes the radiator outlet passage 26, and the first and second bypass valves 35, 36 are opened, so that cooling water circulates in the bypass passage 25 side. At the same time, the cooling water return passage 20 communicates with the suction boat 23a of the water pump 23, so that the cooling water circulates through the oil heater 18. That is, the cooling water that has been heated to a high temperature by the water jacket 2I is supplied to the oil heater I8, and the engine lubricating oil is actively heated. Therefore, after a cold start, the lubricating oil temperature quickly rises by -F. As described above, since the communication hole 38 of the first bypass valve 35 is opened larger than the communication hole 39 of the second bypass valve 36, a flow rate corresponding to the difference in flow rate between the two circulates through the oil heater I8. Therefore, cooling water can be reliably supplied to the oil heater 18.

Also, when the engine warm-up is completed and the cooling water temperature reaches the thermostat valve opening temperature, the first. Second bypass valve 35.
36 is closed, and the main valve 34 is opened, allowing cooling water to circulate through the radiator 22. In this state, the first bypass valve 35 is closed and the circulation of cooling water to the oil heater 18 is also stopped. Therefore,
Thereafter, unnecessary exchange of heat will not occur.

In the above embodiment, the oil heater I8 is connected to the oil tank 5.
However, the present invention is not limited to this, and it is also possible to provide it inside the oil pipe.

Effects of the Invention As is clear from the above explanation, in the internal combustion engine lubrication system according to the present invention, the lubricating oil is actively heated by engine cooling water during warm-up operation after a cold start. , can promote the rise in lubricating oil temperature. Therefore, it is possible to prevent an increase in friction loss during cold operation and a deterioration in fuel efficiency, which are problems with the dry sump system.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a lubricating device according to the present invention, FIG. 2 is an explanatory diagram showing the configuration of a cooling device, and FIG. 3 is a sectional view showing an embodiment of a thermostatic valve. 2... Oil pressure pump, 3... Oil scavenge pump, 5... Oil tank, 8... Oil heater, 24... Thermostatic valve. Figure 2 4 Thermostatic valve

Claims (1)

[Claims] (1) An oil tank that stores lubricating oil, an oil pressure pump that pumps lubricating oil from this oil tank to various parts of the internal combustion engine, and an oil scavenge pump that discharges lubricating oil that has flowed down to the lower part of the crank chamber to the oil tank. In the dry sump type lubricating device, an oil heater that uses cooling water as a heat source is disposed at an appropriate position in the lubricating oil path, and a thermostatic valve that switches the cooling water flow path between the radiator side and the bypass passage side. A lubricating device for an internal combustion engine, characterized in that the system is configured to circulate cooling water to the oil heater when the oil heater is not warmed up.