JP2001065325A - Lubricating oil returning device for supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly return lubricating oil from a supercharger to an oil pan. SOLUTION: In this lubricating oil return device of the supercharger 19, an oil level gauge guide 15 planted in an engine 10 is connected with a lubricating oil return pipe 21 from the supercharger 19 and a blowby gas return pipe 24 from the engine 10 is connected with a non-engine side of the part where the lubricating oil return pipe 21 of the oil level gauge guide 15 is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil return device for a supercharger provided in an engine.

[0002]

2. Description of the Related Art In an engine with a supercharger, lubricating oil is supplied from the engine to a bearing portion of a turbine bearing of the supercharger and the supplied lubricating oil is returned to an oil pan of the engine.
As a conventional lubricating oil return device for a turbocharger,
No. 37, Japanese Utility Model Publication No. 6-18024, connect the lubricating oil return pipe from the supercharger to the oil level gauge guide of the engine and transfer the lubricating oil from the supercharger to the lower part of the oil level gauge guide. There is something to return to the oil pan.

[0003]

However, the prior art has the following problems. When part of the gas in the combustion chamber of the engine blows through the crankcase due to wear of the piston ring (this is called blow-by gas), when the pressure inside the crankcase increases, the turbocharger sends it through the oil level gauge guide. The falling lubricating oil is pushed up by the increase of the pressure in the crankcase, and it is difficult for the lubricating oil to return.

Since the lubricating oil is returned via the oil level gauge guide while the oil level gauge is inserted into the oil level gauge guide, the area of the lubricating oil return passage is reduced, and the lubricating oil is difficult to return.

It is an object of the present invention to smoothly return lubricating oil from a supercharger to an oil pan.

[0006]

According to the present invention, there is provided a lubricating oil return device for a supercharger for returning lubricating oil supplied to a supercharger provided in an engine to an oil pan of the engine. Connect the lubricating oil return pipe from the turbocharger to the oil level gauge guide implanted in the engine, and connect the blow-by gas return pipe from the engine to the opposite side of the engine from the part where the lubricating oil return pipe of the oil level gauge guide is connected. It is designed to be connected.

According to a second aspect of the present invention, in the first aspect of the present invention, the oil level gauge guide is detachable at least during operation of the engine. .

[0008]

According to the first aspect of the present invention, the following operations are provided. The blow-by gas return pipe was connected to the oil level gauge guide to which the lubricating oil return pipe was connected. As a result, the pressure in the crankcase acts on the oil level gauge guide from both upper and lower ends, and these pressures cancel each other out inside the oil level gauge guide. Therefore, the lubricating oil falling from the supercharger via the oil level gauge guide returns to the oil pan smoothly without being affected by the increase in the pressure in the crankcase.

According to the second aspect of the present invention, the following operations are provided. The oil level gauge was removed from the oil level gauge guide at least when the engine was running. Therefore, the area of the lubricating oil return passage in the oil level gauge guide is increased, and obstacles that hinder the return are removed, and the lubricating oil can be returned more smoothly.

[0010]

1 is a schematic diagram showing an engine with a supercharger, FIG. 2 is a schematic diagram showing a lubricating oil return device, and FIG. 3 is a diagram showing a lubricating oil return flow rate.

An engine 10 shown in FIG. 1 includes a cylinder block 11 and a crankcase 1 below the cylinder block 11.
2, an oil pan 13 and a cylinder block 11
, A cylinder head 14 and a rocker cover 14 </ b> A provided at the upper part of the vehicle. In the engine 10, FIG.
As shown in FIG. 2, an oil level gauge guide 15 is implanted in the crankcase 12, and the oil level gauge guide 15 is supported on the cylinder block 11 by a stay 16. When the engine 10 is stopped, the oil level gauge guide 15 is opened. The oil level of the oil pan 13 can be detected by an oil level gauge 17 inserted from 15A.

The engine 10 has a supercharger 19
Are connected. The supercharger 19 is driven by the exhaust of the engine 10, and increases the intake pressure from the intake pipe 18 to improve the output of the engine 10. The supercharger 19 becomes hot due to the influence of the exhaust gas of the engine 10 and the like.
Lubricating oil is supplied from the engine 10 to a bearing portion of the turbine shaft and the like, and the supplied lubricating oil is returned to the oil pan 13 of the engine 10 as follows.

That is, the lubricating oil return pipe 21 connected to the supercharger 19 is connected to a Y-shaped branch pipe 21A provided at an intermediate portion of the oil level gauge guide 15. Branch pipe 21A
Are the lubricating oil return pipe 21 and the oil level gauge guide 15
Smoothes the return of the lubricating oil at the branching point.

Further, a blow-by gas outlet 23 of a blow-by gas return pipe (ventilation hose) 22 extending from the side of the rocker cover 14A to the intake pipe 18 so as to constitute a blow-by gas reducing device of the engine 10. Is formed in a branch shape, and a blow-by gas return pipe 24 branched and connected to the blow-by gas outlet 23 is detachably inserted into the opening 15A of the oil level gauge guide 15 (FIG. 2A). The pressure of the crankcase 12 can be introduced into the opening 15A of the oil level gauge guide 15.

In the engine 10, the oil level gauge 17 is removed from the oil level gauge guide 15 at least when the engine 10 is operated, and the blow-by gas return pipe 24 is inserted into the opening 15A of the oil level gauge guide 15. It is. Oil inspection by the oil level gauge 17 is performed by removing the blow-by gas return pipe 24 when the engine 10 is stopped.

Therefore, according to the present embodiment, the following operations are provided. The blow-by gas return pipe 24 was connected to the oil level gauge guide 15 to which the lubricating oil return pipe 21 was connected. As a result, the pressure in the crankcase 12 acts on the oil level gauge guide 15 from both the upper and lower ends, and these pressures cancel each other out inside the oil level gauge guide 15. Therefore, the lubricating oil that falls from the supercharger 19 via the oil level gauge guide 15 returns to the oil pan 13 smoothly without being affected by the increase in the pressure in the crankcase 12.

At least during operation of the engine 10,
Oil level gauge 17 to oil level gauge guide 1
Removed from 5. Therefore, the oil level gauge guide 15
In this case, the area of the lubricating oil return passage is increased, and obstacles that hinder return are removed, so that lubricating oil can be returned more smoothly.

When the engine 10 is operating, the opening 15A of the oil level gauge guide 15 is closed by the connection of the blow-by gas return pipe 24.
Pressure rises or the oil level gauge guide 15
Even when the lubricating oil is filled, the lubricating oil does not leak to the outside.

FIG. 3 shows a supply flow rate A of the lubricating oil to the supercharger 19 and a lubricating oil return pipe 21 to the oil level gauge guide 15.
The lubricating oil return pipe 21 and the blow-by gas return pipe 24 were connected to the oil level gauge guide 15 in the conventional example in which the oil level gauge 17 was still inserted (the oil level gauge 17 was kept inserted). The level gauge 17 indicates the return flow rate C from the supercharger 19 in the example of the present invention (removed). According to the present invention, the return flow rate of the lubricating oil can be significantly increased.

The present invention can be modified as follows. (1) With the oil level gauge 17 inserted into the opening 15A of the oil level gauge guide 15, a branch port is provided beside the opening 15A, and the blow-by gas return pipe 2 is provided at this branch port.
4 is connected.

(2) The oil level gauge guide 15 is a double pipe comprising inner and outer pipes.
The lubricating oil return pipe 21 and the blow-by gas return pipe 24 are connected to the outer pipe of the oil level gauge guide 15 while keeping the oil level gauge 17 inserted in the inner pipe.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed within a range not departing from the gist of the present invention. The present invention is included in the present invention.

[0023]

As described above, according to the present invention, lubricating oil can be smoothly returned from the supercharger to the oil pan.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an engine with a supercharger.

FIG. 2 is a schematic diagram showing a lubricating oil return device.

FIG. 3 is a diagram showing a return flow rate of lubricating oil.

[Explanation of symbols]

 Reference Signs List 10 engine 13 oil pan 15 oil level gauge guide 17 oil level gauge 19 turbocharger 21 lubricating oil return pipe 21 24 blow-by gas return pipe

Claims (2)

[Claims] A lubricating oil return device for a supercharger for returning lubricating oil supplied to a supercharger provided in an engine to an oil pan of the engine. A lubrication system for a supercharger, wherein a lubricating oil return pipe is connected, and a blow-by gas return pipe from the engine is connected to a portion of the oil level gauge guide connected to the lubricating oil return pipe on a side opposite to the engine. Oil return device. 2. The lubricating oil return device for a turbocharger according to claim 1, wherein the oil level gauge guide is detached from the oil level gauge at least when the engine is operating.