JPS591062Y2 - Oil pipe of engine with turbo gear - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil pipe that supplies lubricating oil from an engine body to a turbocharger in a turbocharged engine.

Generally, in automobile engines equipped with a turbocharger,
A lubricating oil discharge port is provided on one side of the engine body, and a turbocharger is installed on the other side of the engine body.
By connecting the lubricating oil inlet provided in the turbocharger and the above-mentioned discharge port via an oil pipe, and by communicating the lubricant oil outlet provided in the turbocharger with the oil pan of the engine main body, the engine main body When activated, the bearings of the turbocharger can be forcibly refueled.

In addition, the bearing of the turbocharger uses a so-called floating bearing to reduce bearing resistance, so its airtightness is poor, and if the supply of lubricating oil from the engine body is cut off, the oil in the bearing will evaporate. All of the oil is returned to the oil pan of the engine body.

On the other hand, in order to shorten the rise in the lubricating performance of the turbocharger bearing immediately after the engine starts, it is preferable to store lubricating oil in the oil pipe even after the engine has stopped. In an engine, the oil pipe is often routed at a position higher than the discharge port provided in the engine body and the inlet port provided in the turbocharger due to the piping space for the oil pipe and the height of the liquid bottom above ground in the vehicle.

Therefore, conventionally, when the engine stops, the lubricating oil in the oil pipe flows through the turbocharger bearing and into the oil pan of the engine body, so it takes a long time for the oil to reach the turbocharger bearing after the engine is started. This had the disadvantage of causing insufficient lubrication of the turbocharger bearing (for example, Japanese Patent Publication No. 46-15363).
Publication No.).

The present invention was developed in view of the above, and by creating a downward bent part in a part of the oil pipe, lubricating oil can be kept in the oil pipe even after the engine has stopped, that is, after the flow of lubricating oil has stopped. This is intended to shorten the lubrication delay time of the turbocharger after starting or restarting the engine, thereby preventing damage to the bearing portion.

Hereinafter, the present invention will be described in detail based on an embodiment shown in a plan view.

In FIG. 1, an engine body 1 is provided with an oil vibro for feeding lubricating oil in an oil pan 2 to a crankshaft metal 4, a camshaft journal 5, etc. via a main gear rally 3, as in the conventional case.

Further, an oil pressure gauge 8 is attached to the main gear rally 3 via an adapter 7, and a lubricating oil outlet 9 provided in the adapter 7 and a turbocharger 10 located on the opposite side of the oil pressure gauge 8 are lubricated. The lubricating oil outlet 13 of the turbocharger 10 is connected to the oil inlet 11 via an oil pipe 12.
and the oil pan 2 are connected via a return pipe 14.

Here, as shown in the other embodiments in FIG. 2, the oil pipe 12 is protected from obstacles 15 represented by various parts of the engine body or various auxiliary machines attached to the engine body 1. Although the oil pipe 12 is routed around both ends of the oil pipe 12, there are pipes located below the discharge port 9 and the inflow port 11, that is, locally below any connection end of the oil pipe 12. A bent portion 12a having a bottom that extends to the bottom.

12b is provided.

It should be noted that, needless to be described in detail, the turbocharger 10 supports a rotating shaft 18 connecting a turbine wheel 16 and an impeller 17 with a so-called floating bearing 19. - The oil is collected at the outlet 13 via the floating bearing 19 and returned to the oil pan 2 via the return pipe 14.

In this configuration, while the engine is operating, a portion of the lubricating oil supplied from the oil pan 2 to the main gear rally 3 by the oil pump 6 flows into the oil pipe 12 via the discharge port 9.

The lubricating oil flowing into the oil pipe 12 passes through the inlet 11 to the floating bearing 19, lubricates between the bearing 19, the casing and the rotating shaft 18, collects at the outlet 13, and passes through the return pipe 14 to the oil pan. Returned to 2.

When the engine stops, the lubricating oil delivery action by the oil pump 6 is stopped.

At this time, both ends of the oil pipe 12 are substantially open, so the lubricating oil in the oil pipe 12 tries to flow out of the pipe. low bending part 12
a, 12b are provided, so the bent portion 12a,
Oil remains in the portion sandwiched between the bent portions 12b and the bent portions 12a and 12b (the hatched portion shown in FIG. 2).

Therefore, after the engine is started or restarted, the lubricating oil in the hatching portion is immediately supplied to the floating bearing 19 of the turbocharger 10, so that the time required for the oil to reach the engine immediately after starting can be significantly shortened compared to the conventional system. .

Note that when lubrication is started immediately after startup, air may be temporarily supplied, but there is no risk of it having a negative effect on the actual lubrication performance.

In the above embodiment, the bent portions 1 are provided at both ends of the oil pipe 12.
2a and 12b, but if the degree of opening of the main gear rally 3, etc. is small, it is not necessarily necessary to provide a bent part at the end on the engine body 1 side, and only in the vicinity of the end on the turbocharger 10 side. may be provided.

In this case, it goes without saying that in order to ensure that lubricating oil remains, it is effective to increase the capacity of the bent part and to lower the bottom of the bent part sufficiently below the bearing part of the turbocharger 10. do not have.

As described above, according to the oil pipe according to the present invention, even after the engine has stopped, lubricating oil can remain in the downwardly bent part of the oil pipe, at least in the bottom part, so that the engine The delay time for refueling the turbocharger immediately after startup can be significantly shortened compared to the conventional method, and the durability of the bearing portion of the turbocharger can be increased.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of this invention, and FIG. 2 is a developed view of another embodiment. 1...Engine body, 2...Oil pan, 3...
Main gear rally, 9...Discharge port, 10...Turbocharger, 11...Inflow port, 12...Oil pipe, 12a, 12b...Bend portion, 13...Outflow port, 14 ...Return pipe, 19...Floating bearing.

Claims (3)

[Scope of utility model registration request] (1) A turbocharged engine in which a lubricating oil discharge port provided in the engine body and a lubricating oil inlet provided in the turbocharger are connected via an oil pipe that bypasses a portion higher than the discharge port and inlet. In,
An oil pipe for a turbocharged engine, characterized in that a downward bent part is formed in a part of the oil pipe so that the lubricating oil remains there after the flow of the lubricating oil has stopped. (2) A downward bent portion is formed at least near the end on the turbocharger side of the oil pipe, and the bottom of the bent portion is formed lower than the connecting end of either the discharge port or the inlet port of the pipe. An oil pipe for a turbocharged engine according to claim 1 of the registered utility model, characterized in that: (3) The oil pipe for a turbocharged engine according to claim 2, wherein the bottom of the bent part of the oil pipe is provided at a lower position than the bearing part of the turbocharger.