JPH0244026Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lubricating oil return device for a turbocharger in a slant engine.

(Prior art) As a lubricating oil return device for a turbocharger, as in the prior art shown in Japanese Utility Model Application Publication No. 53-163406, the lubricating oil that has come out of the lubricating oil return port of the turbocharger is returned to the inside of the oil pan mainly due to its own weight. There are some that are configured to be returned to .

(Problem to be solved by the invention) In a slant engine tilted with the exhaust side facing downward, the height difference (head) between the lubricating oil return port of the turbocharger and the lubricating oil level in the oil pan becomes smaller. (See FIG. 1) Furthermore, since the lubricating oil return pipe is bent in order to avoid interference with other parts, the return of lubricating oil is much worse than in the prior art.

A concrete explanation of this is as follows. That is, the lubricating oil return pipe usually has a structure in which the lubricating oil return port is opened in the space above the oil surface of the oil pan, but if such a structure is applied to a slant engine, the above-mentioned height Since the difference is small, there are many horizontal parts in the lubricating oil return pipe, making it difficult for the lubricating oil to return. In addition,
In the engine layout where the difference in height is small as described above, the lubricating oil is The oil return port is not opened below the oil level. The reason for this is that when the vehicle turns, etc., the lubricating oil flows backward from the lubricating oil return port due to centrifugal force and tends to reach the bearing of the turbocharger, where there is a risk of oil leakage.

In addition, the lubricating oil return pipe must be installed in a limited space in the engine room to avoid interference with other parts, so the lubricating oil return pipe should be bent along the engine body as much as possible. However, in this case, the bent portion of the lubricating oil return pipe tends to be clogged with gas (gas lock), and the upward force of this gas acts, making the lubricating oil return even worse.

The present invention aims to solve these problems with a simple configuration.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a lubricating oil return device for a turbocharger arranged on the exhaust side of a slant engine that is inclined with the exhaust side facing downward, from the turbocharger to the oil pan. A lubricating oil return pipe that returns lubricating oil using its own weight is arranged so as to have a bent part in the space below the turbocharger and extending toward the slant engine side, and the return port of this lubricating oil return pipe is connected to the A bypass pipe is opened below the surface of the lubricating oil in the pan and connects the vicinity of at least one bent portion of the lubricating oil return pipe to a space above the surface of the lubricating oil in the crankcase. do.

(Function) According to the present invention, the return port of the lubricating oil return pipe is opened below the oil level of the lubricating oil in the oil pan, the height difference is made as much as possible, and the return force due to its own weight is made as large as possible. This reduces the disadvantages of The problem of backflow of lubricant when the vehicle turns, etc., which is newly caused by opening the return port below the oil level, can be solved by the resistance and resistance caused by the bent part provided in the lubricant return pipe to avoid interference with other parts. This is resolved by the throttling action. Furthermore, the problem of gas locking caused by opening the return port below the oil surface and providing a bent part in the lubricating oil return pipe can be solved by providing the bypass passage, through which gas can accumulate in the bent part of the lubricating oil return pipe. The problem was solved by allowing the gas to escape into the crankcase. Therefore, the flow of lubricating oil in the lubricating oil return pipe from the turbocharger to the oil pan can be made smooth.

(Embodiment) In the embodiment of the present invention shown in FIG. 1, the engine main body 8 is arranged in an inclined manner with the exhaust side facing downward, and the turbocharger 1 is arranged on the exhaust side.

The lubricating oil in the oil pan 2 is sucked up by the oil pump 10, and the lubricating oil in the oil pan 2 is sucked up by the oil pump 10
1 to the bearing housing 1 of the turbocharger 1
2. Fuel filler port 1 of turbocharger 1
The lubricating oil that has flowed into the bearing housing 12 from 3 is
After lubricating the internal bearing portion, the lubricating oil flows out from the lubricating oil return port 9 into the lubricating oil return pipe 3. The lubricating oil then returns to the oil pan 2 through the return port 4 through the lubricating oil return pipe 3 mainly due to its own weight.

In order to avoid interference with other parts, the lubricating oil return pipe 3 is bent along the engine body as much as possible, and as shown in FIG.
It is placed in a space on the side. A bypass pipe 7 is connected to the vicinity A of the bent portion A of the lubricating oil return pipe 3, which communicates this portion A with a space 6 above the lubricating oil level in the crankcase 5.

The connection points of the bypass pipe 7 may be selected near the two bends A and B as in the embodiment shown in FIG. 2, or may be selected at more points.

1 and 2, 14 is a strainer, 15 is a supercharging blower of the turbocharger 1 arranged in the intake pipe 16, and 17 is an exhaust turbine of the turbocharger 1 arranged in the exhaust pipe 18.

(Effects of the invention) According to the invention, the return port of the lubricating oil return pipe can be used in the lubricating oil return device of a turbocharger in a slant engine, which tends to have insufficient head and insufficient oil return force due to its own weight. The simple structure of opening below the oil level and adding a bypass pipe prevents gas lock and allows the lubricating oil to flow smoothly and return it smoothly from the turbocharger to the oil pan.
The problem of lubricant backflow when the vehicle turns can be solved by the bent portion provided in the lubricant return pipe to avoid interference with other parts.

[Brief explanation of the drawing]

FIGS. 1 and 2 are system diagrams showing embodiments of the present invention, respectively. 1...Turbo charger, 2...Oil pan,
3...Lubricating oil return pipe, 4...Return port, 5...Crankcase, 6...Upper space, 7...Bypass pipe, A, B...Near the bent portion.

Claims (1)

[Claims for Utility Model Registration] In a lubricating oil return device in a turbocharger disposed on the exhaust side of a slant engine tilted with the exhaust side facing downward, a lubricant that returns lubricating oil from the turbocharger to an oil pan using its own weight. An oil return pipe is arranged so as to have a bent part in the space below the turbocharger and extending to the slant engine side, and the return port of this lubricating oil return pipe is opened below the surface of the lubricating oil in the oil pan. A lubricating oil return device for a turbocharger, characterized in that a vicinity of at least one bent portion of the lubricating oil return pipe and a space above the oil level of the lubricating oil in the crankcase are connected by a bypass pipe.