JPS595122Y2 - Internal combustion engine lubricating oil distribution device - Google Patents

Description

[Detailed description of the invention] This invention is based on the lubricating oil system of the main body of an internal combustion engine, which includes main lubricating parts such as the crankshaft metal that consume a large amount of lubricating oil, and sub-lubricating parts such as piston cooling juts and fuel pump lubrication. The system attempts to adjust the amount and pressure of lubricating oil supplied to both lubricating parts using a primary pressure regulating valve and a secondary pressure regulating valve provided in the lubricating oil system.

As is clear from Fig. 1, which shows the conventional lubricating oil system, the lubricating oil sucked up from the oil pan 1 by the lubricating oil pump 2 passes through the lubricating oil pump 2, and then its pressure is regulated by the pressure regulating valve ■, and the lubricating oil is transferred to the main lubricating part C1. It is sent to the sub-lubrication section C2.

The main lubricating part C1 is a lubricating part that has a particularly large load and generates a large amount of heat among the parts that require lubrication, and requires the supply of lubricating oil regardless of whether the engine rotation speed is low or high.
For example, parts such as crankshaft journal metal, pin metal, etc. are mentioned, and sub-lubrication part C2 is a part that requires lubrication, but does not have a large load or heat generation, so lubrication is required most of the time when the engine is running at low speeds and under low load. Examples of such parts are piston cooling jets, fuel pump lubrication parts, timing gear parts, etc. However, the parts corresponding to C It is a matter of choice.

In such a conventional type of lubricating oil system, the lubricating parts C1 and C
There is only one pressure regulating valve ■ in front of 2, the lubricating part CI, and 0
2 are piped in parallel, both lubricating parts C1 and C2
The same lubricating oil pressure is applied to both lubricating parts C1 and C, for example, even when the engine is rotating at low speed and low load.
2 at the same pressure, but since there is no need to supply lubricating oil to the sub-lubricating part C2 during low-speed, low-load operation,
The lubricating oil pump (2), which has no choice but to supply lubricating oil to the sub-lubricating portion C2 even during low-speed, low-load operation, must be selected to have a larger capacity than necessary.

Furthermore, when such a large-capacity lubricating oil pump 2 is operated at high speed, the lubricating oil pump 2 is also rotating at a high speed, so its discharge amount and discharge pressure are extremely high, causing overflow from the pressure regulating valve V. The amount of lubricating oil dumped into the oil pan 1 reaches about half of the discharge amount of the lubricating oil pump 2 during high speed rotation.

In this way, in conventional lubricating oil systems, a single pressure regulating valve regulates the pressure of the entire lubricating oil system, and lubricating oil is supplied to all lubricated parts at the same pressure, which reduces the pressure from the oil seal part. In addition to worrying about oil leakage, the capacity of the lubricating oil pump had to be made larger than necessary, and it was not possible to increase the driving horsepower of the lubricating oil pump.

As a means to reduce wastage of lubricating oil during high-speed rotation of the engine in such conventional measures, piston cooling of an internal combustion engine is performed in which the escape oil from the lubricating oil pressure regulating valve is injected into the inner surface of the piston through a conduit. Equipment (Special public service 1981-81
However, in this case, no means is provided to adjust the pressure of the oil escaping from the lubrication oil pressure regulating valve, so the pressure of the oil injected onto the inner surface of the piston is extremely low, and the piston cooling device Not only is this impractical, but in this invention, most of the sub-lubricating parts such as the fuel pump's lubricating part and the timing gear part are still piped in parallel with the main lubricating part, so the capacity of the lubricating oil pump is reduced. The drawback is that it must be made larger than necessary.

The present invention was devised to solve the root cause of the conventional lubricating oil pump having an unnecessarily large capacity as described above. In the lubricating oil system, there is a primary pressure regulating valve set to It is an object of the present invention to provide a lubricating oil supply and distribution device for an internal combustion engine having a configuration as described above.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the accompanying drawings.

In FIG. 2, the oil pan 10 and the lubricating oil pump 11 are connected by a piping 12, and the lubricating oil pump 11 and the main lubricating part C1 are connected by a piping 13, and the piping 1
3 is connected to a bypass pipe 15 that detours around the main lubricating part C1 through a branch pipe 14 in the middle, and the bypass pipe 15 is also connected to a pipe 17 which connects to the sub-lubricating part C2 through a branch pipe 16 in the middle.

In addition, a primary pressure regulating valve (1) is provided between the branch pipe 14 and the branch pipe 16, and a secondary pressure regulating valve (2) is interposed in the pipe 18 connecting the branch pipe 16 and the oil pan 10. A safety valve v5 is provided in a pipe 20 that connects the branch pipe 19 and the oil pan 10, which are provided in the middle of the pipe 13 that connects the branch pipe 14 and the lubricating oil pump 11.

Here, the opening pressure of each valve is adjusted in the order of safety valve V5 to the highest, then primary pressure regulating valve V1, and secondary pressure regulating valve ■2.
For example, safety valve V5 is 7 kg/cm2, primary pressure regulating valve V1 is 5 kg/cm2, and secondary pressure regulating valve V2 is 3 kg/cm2.
It seems like the pressure is being regulated.

Such piping and branch pipes may be constituted by independent tubes, pipes, T-shaped tubes, etc., or may be formed by oil passages provided in the engine during casting.

Next, the operation of the above embodiment will be explained. First, when the engine is at low speed, both the discharge amount and the discharge pressure of the lubricating oil pump 11 are low, so the lubricating oil sucked from the oil pan 10 by the lubricating oil pump 11 is The discharge pressure from the pump 11 is the opening pressure of the first primary pressure regulating valve V1, for example, 5 kg/c.
m2, all the lubricating oil sucked up by the lubricating oil pump 11 is sent to the main lubricating part C1, and no lubricating oil is sent to the sub-lubricating part C2.

On the other hand, when the engine is operated at high speed, the lubricating oil pump 1
For example, if the discharge pressure of V is set to 6 kg/Cm2, the opening pressure of the primary pressure regulating valve V will be 5 kg/Cm2.
cm2, some of the lubricating oil discharged by the lubricating oil pump 11 flows out from the oil release outlet of the primary pressure regulating valve v1, but this spilled lubricating oil is dammed up by the secondary pressure regulating valve ■2. Hydraulic pressure in branch pipe 16 is 3 kg/cn
Until the pressure exceeds n2, all of the lubricating oil is sent to the lubricating portion C2, and when the same pressure exceeds 3 kg/cm2, a part of the lubricating oil flows out into the oil pan 10 beyond the secondary pressure regulating valve ■2.

At this time, the pressure of the lubricating oil supplied to the auxiliary lubricating part C2 is suppressed below the opening set pressure of the secondary pressure regulating valve (2), so that leakage from the oil seal part is also prevented.

In addition, if the above piping or branch pipe is clogged with foreign matter, the branch pipe 14
When the pressure in the piping 13 between the lubricating oil pump 11 and the lubricating oil pump 11 becomes higher than the opening pressure of the safety valve V5, for example 7 kg/cm2, the safety valve V5 opens and all the lubricating oil discharged from the lubricating oil pump 11 is drained into oil. Since the lubricating oil pump 11 is circulated back into the pan 10, there is no risk that the lubricating oil pump 11 will break due to overload.

As described above, the present invention provides a lubricating oil system for an internal combustion engine in which a main lubricating part is connected to the outlet of a lubricating oil pump and a primary pressure regulating valve is provided in parallel with the main lubricating part. The secondary pressure regulating valve and the auxiliary lubrication part are connected in parallel, and the opening pressure of the secondary pressure regulating valve is set lower than that of the primary pressure regulating valve, so lubricating oil must be supplied when the engine rotates at low speeds. Lubricating oil is not sent to the sub-lubricated parts that do not require high-speed rotation, and the oil supply pressure to the sub-lubricated parts that require only a small amount of lubricating oil even at high speeds is set low by the secondary pressure regulating valve. Since the lubricating oil pump is designed to be able to send the minimum amount of lubricating oil to the lubricated parts in any case, a small and small-capacity lubricating oil pump can be selected, which helps improve the fuel efficiency of the engine. At the same time, lubricating oil is consumed less, and an engine with no waste can be provided.

[Brief explanation of drawings]

FIG. 1 is a piping diagram showing a conventional lubricating oil system, and FIG. 2 is a piping diagram showing one embodiment. 11...Lubricating oil pump, C1...Main lubrication part, C2...Sublubrication part, ■1...
...Primary pressure regulating valve, ■2...Secondary pressure regulating valve, ■5.
·····safety valve.

Claims (1)

[Scope of utility model registration request] A main lubricating part C1 is provided at the outlet of the lubricating oil pump 11, and a primary pressure regulating valve (1) is provided in parallel with the main lubricating part C1 in the middle of a pipe 13 that connects the lubricating oil pump 11 and the main lubricating part C1. In a lubricating oil system for an engine body of an internal combustion engine, a secondary pressure regulating valve (2) and a sub-lubricating portion C2 are connected in parallel to the oil relief outlet of the secondary pressure regulating valve (1), and A lubricating oil supply and distribution device for an internal combustion engine, characterized in that the opening pressure of a primary pressure regulating valve v2 is set lower than that of a primary pressure regulating valve v1.