JPS6040807Y2 - Lubricating device for internal combustion engines - Google Patents

Description

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

[Conventional technology]

Conventionally, as the above-mentioned lubricating device, a dry sump type lubricating device as shown in FIG. 1 has been known.

The lubricating system shown in FIG. 1 stores lubricating oil (hereinafter referred to as oil) in an oil tank 2 installed separately from an internal combustion engine 1, and supplies the oil from this tank 2 to each sliding part of the engine 1 using a feed pump 3. The lubricated oil is collected by gravity in an oil pan 4 at the bottom of the engine 1, and from this oil pan 4 is returned to the oil tank 2 by a scavenge pump 5 [Mechanical Research No. 17]
Volume No. 4 (1965), Automotive Engine Lubrication System 1: Takashi Ushijima].

In FIG. 1, reference numeral 6 is a radiator, 7 is an oil cooler, and 8 is an oil level gauge.

Compared to the general wet sump type lubricating system, the lubricating system as described above stores oil in the oil tank 2, which is separate from the engine 1, so it can follow changes in the engine posture and prevents oil from blowing out. Moreover, since the period during which the blow-by gas and oil are in contact is short, there is an advantage that the oil is less affected by deterioration and heat.

[Problem that the invention attempts to solve]

However, it requires an oil tank separate from the engine and a scavenge pump with performance comparable to that of the feed pump, and has the disadvantage that each piping is complicated and therefore expensive.

It is an object of the present invention to provide a simple and inexpensive lubricating system for an internal combustion engine that eliminates the above-described drawbacks of the conventional dry sump type lubricating system without losing the advantages of the dry sump type lubricating system.

[Means for solving problems]

In order to achieve this objective, the internal combustion engine lubricating device of the present invention separates the inside of the oil pan into two chambers, and uses a scavenging system to raise the oil level in one chamber higher than the oil level in the other chamber. A pump is provided in the oil pan, the discharge side of the scavenge pump is placed in one chamber, the suction side is placed in the other chamber,
The chambers are connected to each other and are provided with a supply means for supplying oil to necessary parts of the engine from one chamber where the oil level is high, and a return means for returning oil to the other chamber.

Regarding the separation of the inside of the oil pan into two chambers through which oil can flow, there is a prior art related to Japanese Utility Model Publication No. 52-35375.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 2 showing an embodiment of the present invention, reference numeral 11 is an internal combustion engine, and this internal combustion engine 11 includes a cylinder 12 inclined with respect to a horizontal plane, a piston 13 fitted into the cylinder 12, and a piston 13 fitted into the cylinder 12.
A valve mechanism 15 provided on the cylinder head 14,
An oil pan 17 is provided below the cylinder 12 with a crankcase 16 in between.

Additionally, a blow-by gas passage 18 is provided above the cylinder 12.
However, oil return passages 19 are formed on the lower side so as to communicate with the upper portion of the cylinder head 14 and the inside of the crankcase 16, respectively.

The oil pan 17 has two chambers 17a,
It is divided into 17b.

A scavenge pump 22 is installed within the oil pan 17.

A discharge side of this pump 22 is communicated with a discharge pipe 27,
The discharge pipe 27 is fixed to the lower part of the partition wall 20 and opens into one chamber 17a, and this opening is provided with a one-way valve 21 that only allows oil to flow into the one chamber 17a side.
Further, the scavenge pump 22 is provided in the other chamber 17b.

An overflow communication hole 23 that communicates the upper part of one chamber 17a with the other chamber 17b is provided in the upper part of the partition wall 20, and a suction pipe 25 that communicates with the suction side of the oil pump 24 is provided at the bottom of one chamber 17a. is opened.

In addition, in FIG. 2, the reference numeral 26 is a strainer provided at the lower end of the suction pipe 25.

In the lubricating device configured as described above, before the engine 11 is started, the oil levels in both chambers 17a and 17b in the oil pan 17 are at the same height.

However, when the engine 11 is operated, the scavenge pump 2
2 is also driven to suck oil from the other chamber 17b of the oil pan 17, and the oil discharged from the scavenge pump 22 opens the one-way valve 21 and flows into the one chamber 17a.

Further, the oil pump 24 is driven by the operation of the engine 11, and oil is sucked into the oil pump 24 from one chamber 17a through the suction pipe 25, and the oil discharged from the pump 24 is supplied to each sliding part of the engine 11. and lubricate these parts.

A portion of the oil after lubrication is returned directly from the inside of the crankcase 16 to the other chamber 17b of the oil pan 17, and another portion is returned to the other chamber 17b through the oil return passage 19 and the inside of the crankcase 16. It will be done.

In this case, one chamber 1 is
The amount of oil flowing into 7a is made larger than the amount of oil flowing out from one chamber 17a by an oil pump 24, and oil is stored in one chamber 17a.

Note that the oil in one chamber 17a is connected to the overflow communication hole 2.
When the oil level reaches 3, it flows out from this communication hole 23 to the other chamber 17b.

Moreover, even if the engine 11 stops, the one-way valve 21 at the bottom of the partition wall 20 closes, so that the one-way valve 21 can be moved from one chamber 17a to the other chamber 17b.
Hair oil never returns.

In this invention, the scavenge pump 22 is installed in one chamber 17a or both chambers 17a and 17b of the oil pan 17.
Depending on the type of scavenge pump 22, the one-way valve 21 may be provided across one chamber 17a to 17b.
This can be omitted as it prevents the hair oil from returning.

[Effect of idea]

As explained above, according to the internal combustion engine lubrication system of the present invention, oil is stored at a high oil level in one chamber of the oil pan, so it has the same advantages as the conventional dry sump type lubrication system, namely, the engine posture. Good lubrication is possible even if the engine is installed at an angle or when the engine is installed at an angle.It also prevents oil from blowing out, and since the period in which the oil is in contact with blow-by gas and heat is short, the oil is less likely to deteriorate. Since the oil pan of a general wet sump system can be configured with a partition wall to form two chambers, there is no need for an oil tank installed separately from the engine, which is required for conventional dry sump systems. Since the scavenge pump for raising the oil pressure is installed inside the oil pan, the piping is simple.Compared to conventional scavenge pumps, the scavenge pump of the present invention requires a smaller capacity, has a simple structure, and is inexpensive. The effect is obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional lubricating device, and FIG. 2 is a schematic vertical sectional view showing an embodiment of the lubricating device according to the present invention. 1... Internal combustion engine, 2... Oil tank, 3... Feed pump, 4... Oil pan, 5... Scavenge pump, 6...
...Radiator, 7...Oil cooler, 8...
... Lebel gauge, 11 ... Internal combustion engine, 12
...Cylinder, 13...Zeston, 14
... Cylinder head, 15 ... Valve mechanism, 16 ... Crank case, 17 ...
・Oil pan, 17a...One chamber, 17b・
...Other chamber, 18...Blow-by gas passage, 19...Oil return passage (return means),
20... Bulkhead, 21... One-way valve, 2
2...Scavenge pump, 23...Overflow communication hole, 24...Oil pump (supply means), 25...Suction pipe, 26... ...
Strainer, 27...Discharge pipe.

Claims (1)

[Scope of utility model registration request] The inside of the oil pan is divided into two chambers, and a scavenge pump is provided in the oil pan to raise the oil level in one chamber higher than the oil level in the other chamber, and the discharge side of the scavenge pump is placed in one chamber. It is characterized by having a supply means for communicating the suction side with the other chamber, supplying oil to necessary parts of the engine from one chamber where the oil level is high, and means for returning oil to the other chamber. Lubricating device for internal combustion engines.