JPS6345525Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lubricating oil supply device for an internal combustion engine, particularly to a lubricating oil supply device for an internal combustion engine of a vehicle.

[Conventional technology]

Fig. 3 shows a conventional lubricating oil supply system for an internal combustion engine of a vehicle.This lubricating oil supply system includes an oil cooler c and an oil pump b located downstream of an oil pump b that sucks up lubricating oil from an oil pan a. A main oil gear rally e is connected through a filter d, and lubricating oil is supplied from the main oil gear rally e to a crankshaft system f, a piston system g, a camshaft system h, and a valve train system i. The friction loss and wear of these lubrication systems, such as crankshaft system f, piston system g, camshaft system h, and valve train system i, are reduced (for example, Japanese Utility Model Publication No. 121914/1983).

[The problem that the idea aims to solve]

However, regarding the above lubricating oil supply device,
It is supplied to each lubrication system through the oil cooler regardless of whether the engine is running normally (partial load operation) or high load operation when climbing a slope, that is, regardless of the lubricating oil temperature state. As shown in Figure 4, during high-load operation such as when climbing hills, the temperature of the lubricating oil in oil pan a (60°C to 70°C)
℃) is higher than the engine cooling water temperature (80℃), so it is possible to cool it with oil cooler c and supply high viscosity lubricating oil with low oil temperature to each lubrication system, but during normal partial load operation, Since the temperature of the lubricating oil in oil pan a is lower than that of the cooling water, it is conversely warmed by passing through oil cooler c, and high-viscosity lubricating oil with a relatively high oil temperature is supplied to each lubrication system. . Therefore, relatively high temperature and low viscosity lubricating oil is supplied even to the valve train system i which particularly requires lubricating oil with high viscosity. The relationship between the lubricating oil temperature, lubricating oil viscosity, and friction loss is as shown in FIG. 5, and the higher the lubricating oil temperature and the lower the lubricating oil viscosity, the larger the friction loss. Therefore, the influence on the friction loss and wear of the valve train i was large.

Although it is not directly related to the friction loss of the valve train i, it is also used as a lubricating oil supply device.
Some are described in Publication No. 8307.

The present invention was developed to solve the above problem, and mainly reduces friction loss and wear in the valve train by supplying low-temperature, high-viscosity lubricating oil even during partial load operation during engine operation and normal running. The object of the present invention is to provide a lubrication supply device for an internal combustion engine that reduces the

[Means to solve the problem]

The structure of the present invention to achieve the above object is to supply lubricating oil to an internal combustion engine by connecting a main oil gear rally to the downstream side of an oil pump via an oil cooler to supply lubricating oil to the lubricating system including the valve train. In the device, a sub-oil gear rally that supplies lubricating oil to the valve train system via a communication path is connected to the main oil gear rally, and an on-off valve that opens when the lubricating oil temperature is higher than the engine cooling water temperature is installed in the communication path. A sub-oil gear rally is connected to the downstream side of the oil pump via a bypass communication passage, and an on-off valve that opens when the lubricating oil temperature is lower than the engine cooling water temperature is installed in the bypass communication passage.

[Effect]

When the lubricating oil temperature in the oil pan is higher than the engine cooling water temperature during high-load operation such as climbing hills, the on-off valve installed in the communication passage is opened and the high-viscosity lubrication is cooled by the oil cooler. Oil is supplied to the valve train.

On the other hand, when the lubricating oil temperature in the oil pan is lower than the engine cooling water temperature during partial load operation such as normal driving, the on-off valve installed in the bypass communication passage is opened and the lubricating oil is directly supplied to the oil pan without passing through the oil cooler. lubricating oil with low oil temperature and high viscosity is supplied to the valve train, reducing friction loss and wear.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an embodiment of a lubricating oil supply device for an internal combustion engine according to the present invention.

In the figure, 1 is an oil pan, and 2 is an oil pump that sucks up lubricating oil from the oil pan 1.
A connecting passage 5 in which an oil cooler 3 and an oil filter 4 are provided is connected to the downstream side of the oil pump 2, and the connecting passage 5 is connected to a main oil gear rally 6. The main oil gear rally 6 has branch passages 7a, 8a, 9 for supplying or jetting lubricating oil to each lubrication system, that is, the crankshaft system 7, the piston system 8, and the camshaft system 9.
a is connected. Further, a sub oil gear rally 11 is connected to the main oil gear rally 6 via a communication path 10.
A branch passage 12a that supplies lubricating oil to the valve train 12 is connected from the valve train 1 to the valve train 12. On the other hand, a sub-oil gear rally 11 is directly connected to the downstream side of the oil pump 2 via a bypass communication passage 13. A communication passage 10 connecting the main oil gear rally 6 and the sub oil gear rally 11 is provided with an on-off valve (thermostat) 14 that opens when the lubricating oil temperature is higher than the engine cooling water temperature. A bypass communication passage 13 connecting the downstream side of the cooler 3 and the sub-oil gear rally 11 is provided with an on-off valve (thermostat) 15 that opens when the lubricating oil temperature is lower than the engine cooling water temperature. .

Incidentally, although not shown in the drawings, excess lubricating oil is deposited in each of the lubrication systems, that is, the crankshaft system 7, the piston system 8, the camshaft system 9, and the valve train 12.
A return route is provided to return to.

For example, when the lubricating oil temperature in the oil pan 1 is higher than the engine cooling water temperature, such as during high-load operation when traveling uphill, the on-off valve 14 of the communication passage 10 is opened and the on-off valve 15 of the bypass communication passage 13 is closed. All lubricating oil from an oil pan 1 is cooled through an oil cooler 3. The low-temperature, high-viscosity lubricating oil cooled by the oil cooler 3 is supplied to each lubrication system, that is, the crankshaft system 7, the piston system 8, and the camshaft system 9, through the main oil gear rally 6, and is also supplied to the sub oil gear rally 11. It is supplied to the valve train 12 through. Therefore, during high-load running, low-temperature, high-viscosity lubricating oil is supplied to each lubrication system, reducing friction loss and wear in each lubrication system.

On the other hand, when the lubricating oil temperature in the oil pan 1 is lower than the engine cooling water temperature, such as during partial load operation during normal driving, the on-off valve 14 of the communication passage 10 is closed and the on-off valve 15 of the bypass communication passage 13 is opened. A portion of the lubricating oil from the oil cooler 3 is supplied to the crankshaft system 7, piston system 8, and camshaft system 9 through the main oil gear rally 6. The other part of the lubricating oil does not pass through the oil cooler 3, but passes through the sub-oil gear rally 11 and is directly supplied to the valve train 12, which requires high-viscosity lubricating oil. Therefore, friction loss and wear of the valve train 12 are reduced during normal partial load operation.

FIG. 2 shows another embodiment of the lubricating oil supply device for an internal combustion engine according to the present invention.

This embodiment has a bypass communication passage 1 in which an air-cooled oil cooler 16 is provided in the middle of the bypass communication passage 13.
7 is connected, and an on-off valve (thermostat) 18 that opens and closes at a predetermined temperature is installed at the branch part.

For example, when the lubricating oil temperature in the oil pan 1 is lower than the engine cooling water temperature during normal driving with a partial load, the on-off valve 1 of the bypass communication passage 13
5 is opened and the lubricating oil is sent directly to the sub-oil gear rally 11 through the bypass communication passage 13 and from there to the valve train 12, when the lubricating oil is at a low temperature such as during startup, it is not passed through the air-cooled oil cooler 16. The oil is directly led to the sub-oil gear rally 11 and supplied to the valve train 12. On the other hand, when the lubricating oil exceeds a predetermined temperature, it is supplied to the valve train 12 through the air-cooled oil gear rally 16.

In this way, lubricating oil is supplied directly to the valve train 12 through the bypass communication passage 13 by opening and closing the on-off valve 18 depending on the oil temperature, or directly to the air-cooled oil cooler 1.
By cooling at step 6, it becomes possible to more accurately adjust the oil temperature and viscosity depending on the engine situation.

[Effect of idea]

As described above, the present invention connects a sub-oil gear rally that supplies lubricating oil to the valve train through a communication path to the main oil gear rally, and opens the communication path when the lubricating oil temperature is higher than the engine cooling water temperature. An on-off valve is installed, and the sub-oil gear rally is connected to the downstream side of the oil pump via a bypass communication passage, and an on-off valve that opens when the lubricating oil temperature is lower than the engine cooling water is installed in the bypass communication passage. High-viscosity lubricating oil can be supplied to each lubricating system during engine operation, and low-temperature, high-viscosity lubricating oil can be supplied to the valve train system even during partial load operation during normal running, reducing friction loss and wear. is reduced.

[Brief explanation of the drawing]

Figure 1 is a lubrication system diagram of one embodiment of the present invention, Figure 2
The figure is a main part lubrication system diagram of another embodiment of the present invention.
The figure is a conventional lubrication system diagram, Figure 4 is a characteristic diagram showing the characteristics of lubricating oil temperature and engine cooling water temperature with respect to time, and Figure 5 is a characteristic diagram showing the relationship between lubricating oil temperature, lubricating oil viscosity, and friction loss. It is a curve diagram. 1...Oil pan, 2...Oil pump, 3...
...Oil cooler, 6...Main oil gear rally, 10...Communication passage, 11...Sub oil gear rally, 12...Valve train system, 13...Bypass communication passage, 14, 15, 18...Opening/closing valve, 16... ...Air-cooled oil cooler, 17...Bypass communication passage.

Claims (1)

[Scope of utility model registration request] In a lubricating oil supply device for an internal combustion engine that connects a main oil gear rally downstream of an oil pump via an oil cooler to supply lubricating oil to a lubrication system including a valve train, the main oil gear rally is connected to the main oil gear rally via a communication path. A sub-oil gear rally that supplies lubricating oil to the valve train is connected, and an on-off valve that opens when the lubricating oil temperature is higher than the engine cooling water temperature is installed in the communication passage, and a bypass communication passage is provided downstream of the oil pump. A lubricating oil supply device for an internal combustion engine, characterized in that a sub-oil gear rally is connected to the sub-oil gear rally via the bypass connecting passage, and an on-off valve that opens when the lubricating oil temperature is lower than the engine cooling water temperature is installed in the bypass communication passage.