JPH0248675Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a return oil pipe for returning lubricating oil from an exhaust turbo supercharger installed in an internal combustion engine into the crankcase of the cylinder block of an internal combustion engine. It is related to the device.

[Conventional technology]

When the lubricating oil from the exhaust turbocharger installed in the internal combustion engine returns and flows into the crankcase of the cylinder block of the internal combustion engine, the return oil pipe is connected to the lubricating oil outlet of the exhaust turbocharger and the crankcase. In order to absorb thermal expansion and dimensional errors in the relative position between the oil return hole and the case, it was common to form a flexible tube such as a rubber hose, but since flexible tubes are quite expensive, In a previous application for utility model registration (Utility Model Application No. 120816/1982), the present applicant constructed an oil return pipe from a lubricating oil outlet in an exhaust turbo supercharger installed in an internal combustion engine with a metal pipe, and After fitting a sealing O-ring to the outer periphery of the lower end, the lubricating oil outlet of the exhaust turbocharger and the oil return hole of the crankcase are connected by inserting the lower end into the oil return hole of the crankcase. It is proposed to absorb the dimensional error and thermal expansion of the relative position between the two.

When inserting the lower end of the oil return pipe with the O-ring into the oil return hole, if it is inserted too deeply into the oil return hole, the O-ring may fall into the crankcase or the O-ring may be damaged. Therefore, in the prior application, the depth of insertion into the oil return hole is regulated by welding a flange that contacts the outer surface of the crankcase to the lower end of the oil return pipe. That's what I do.

[Problem that the invention attempts to solve]

However, welding a flange to the oil return pipe in order to regulate the insertion depth into the oil return hole cannot sufficiently reduce manufacturing costs due to the increased number of parts and welding man-hours. So it was warm.

In the case where the lower end of the oil return pipe with the O-ring is inserted into the oil return hole as in this earlier application, the present invention provides the following advantages:
The manufacturing cost is reduced by regulating the insertion depth using other parts attached to the inner surface of the crankcase.

[Means for solving problems]

For this reason, the present invention provides an internal combustion engine in which an oil strainer support bracket for lubricating oil is installed in the crankcase of the cylinder block, and an exhaust turbo supercharger is installed, and the lubricating oil is discharged from the lubricating oil outlet of the exhaust turbo supercharger. the other end of the oil return pipe,
In an oil return pipe device in which a sealing O-ring is fitted on the outer periphery and inserted into an oil return hole drilled in the crankcase, a part of the support bracket for the oil strainer installed in the crankcase is inserted into the oil return hole. It is configured so that it protrudes into the opening into the crankcase.

[Functions and effects of the idea]

In this way, when a part of the support bracket for the oil strainer attached to the inner surface of the crankcase is protruded into the opening of the return oil hole in the crankcase toward the inner surface of the crankcase, it is possible to insert the return oil pipe into the return oil hole. The tip of the O-ring comes into contact with the support bracket for the oil strainer that protrudes into the oil return hole, preventing further insertion. This will prevent you from getting depressed or damaging the O-ring.

The present invention regulates the insertion depth of the oil return pipe into the oil return hole in the crankcase by using an oil strainer support bracket attached to the inner surface of the crankcase, and is similar to the previous application. Since there is no need to weld a flange for regulating the insertion depth to the return oil pipe, the number of parts and processing steps are reduced, which has the effect of further reducing manufacturing costs.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.
An internal combustion engine is shown in which oil pans 5 are connected to the lower surface of the crankcase 4 in the lower part, an exhaust turbo supercharger 6 is attached to the side surface of the cylinder head 3, and lubricating oil is contained in the oil pan 5. An oil strainer 7 is provided for the crankcase 4, and the oil strainer 7 has a base end 9a connected to the crankcase 4.
Support bracket 9 fastened with bolt 8 to the inner surface of
Supported by

The crankcase 4 has an oil return hole 10 near the mounting base 9a of the support bracket 9.
On the other hand, the upper end of an oil return pipe 11 is connected to the lubricating oil outlet 6a of the exhaust turbo supercharger 6, and the lower end 11a of the oil return pipe 11 is provided with an annular groove 1.
2 for sealing in this annular groove 12.
After fitting the ring 13, the lower end 1 of the oil return pipe 11
1a is the oil return hole 10 in the crankcase 4.
Insert inside. A two-stage chamfered portion 10a is provided at the opening of the oil return hole 10 to the outside of the crankcase 4 to facilitate insertion of the oil return pipe 11 into the oil return hole 10.

The base 9a of the support bracket 9 for the oil strainer 7 is configured to protrude into the opening of the oil return hole 10 into the crankcase 4.

By protruding the base 9a of the support bracket 9 into the opening of the oil return hole 10 into the crankcase 4, the insertion depth of the lower end 11a of the oil return pipe 11 into the oil return hole 10 can be adjusted to Since it is regulated by the base 9a of the bracket 9, if the lower end 11a of the oil return pipe 11 is inserted too far into the return oil hole 10, the O-ring 13 may fall into the crankcase 4, or the O-ring 13 may fall into the oil return hole 10. Return oil hole 1
This makes it possible to prevent scratches caused by the corner of the opening into the crankcase 4 of the crank case 4.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of an internal combustion engine, and FIG. 2 is an enlarged sectional view of the main part of FIG. 1. 1...Internal combustion engine, 2...Cylinder block, 3
... Cylinder head, 4 ... Crank case, 5
...Oil pan, 6...Exhaust turbo supercharger, 7...
...Oil strainer, 8...Bolt, 9...Support bracket, 10...Return oil hole, 6a...Lubricating oil outlet of exhaust turbo supercharger, 11...Oil return pipe, 12...
...Annular groove, 13...O ring.

Claims (1)

[Scope of utility model registration request] An exhaust turbo supercharger is installed in an internal combustion engine comprising a support bracket for an oil strainer for lubricating oil installed in the crankcase of a cylinder block, and the other end of the oil return pipe from the lubricating oil outlet of the exhaust turbo supercharger is installed. In the oil return pipe device, which is fitted with a sealing O-ring on its outer periphery and inserted into the oil return hole drilled in the crankcase, a part of the support bracket for the oil strainer installed in the crankcase is connected to the oil return pipe. A return oil pipe device from an exhaust turbo supercharger in an internal combustion engine, characterized in that the hole protrudes into an opening into a crankcase.