JPS5930181Y2 - Engine turbocharger lubrication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating device for a turbocharger in an engine equipped with a turbocharger driven by an exhaust turbine.

It is generally known that the turbocharger is simultaneously lubricated with the lubricating oil for the engine, but since the oil pressure of the lubricating oil for the turbocharger is considerably lower than that for the various operating parts of the engine, the lubricating oil for the engine is When lubricating the turbo supercharger with oil at the same time, it is necessary to regulate the oil pressure and oil amount of the lubricating oil to the turbo supercharger so that the oil pressure and oil amount of the lubricating oil to the engine do not decrease.
If this oil pressure and hydraulic pressure were to be regulated using an orifice, the orifice would have to be extremely small in diameter, so it would be easy for the orifice to become clogged, and if it were clogged, the supply of lubricating oil to the turbocharger would be cut off. There was a risk that the turbo supercharger would seize up.

This invention uses multiple orifices to regulate the oil pressure and amount of lubricating oil from the lubricating oil pump in the engine and supplies it to the turbocharger, and also allows some of the lubricating oil to escape. By doing so, it is possible to continuously and reliably refuel the turbo supercharger without clogging the orifice.

Next, an example of the present invention will be explained with reference to the drawings. In the drawing, 1 is an engine, 2 is an exhaust turbine 3 connected to the exhaust system of the engine, and a blower-compressor 4 connected to the intake system of the engine, and a bearing located therebetween. Each turbocharger is directly connected to the housing 5, and the bearing housing 5 in the turbocharger 2 is provided with a lubricating oil inlet port 6 for the bearing therein and a lubricant outlet port 7 from the bearing.

An oil filter 8 is attached to the side of the engine 1, and the lubricating oil pumped up by the lubricating oil pump 10 from the oil pan 9 of the engine passes through the oil filter 8 and reaches the main gary 11, from where the engine pistons and It is sent to various operating parts such as valve mechanisms and various bearings.

A lubricant branch port 12 is provided in the main gary 11 on the discharge side of the lubricant pump 10, and the branch port 12 and the bearing housing 5 in the turbo supercharger 2
A lubricating oil inlet port 6 of the turbocharger 2 is connected to the lubricating oil inlet port 6 by a lubricating oil supply passage 13, and two orifices 14, 15, a first and second orifice, are provided in series in the supply passage 13. The lubricating oil outlet port 7 of No. 5 is connected to the oil pan 9 of the engine via a lubricating oil return passage 16, and the portion 1 between the return passage 16 or the oil pan 9 and both orifices 14 and 15 of the lubricating oil supply passage 13 is
7 are connected to each other via a relief passage 19 provided with a third orifice 18.

In this configuration, a portion 17 of the lubricating oil supply passage 13 between the two orifices 14 and 15 communicates with the oil pan 9 at approximately atmospheric pressure via the orifice 18, so that the lubricating oil supply passage 13 is not fed from the main galley 11 of the engine 1. The incoming lubricating oil is first regulated by the first orifice 14 and then reaches the area 17 between the two orifices 14 and 15, and some of the lubricating oil escapes from the third orifice 18 to the oil pan 9 and is released. As a result, the pressure and the amount of oil decrease, which is further regulated by the second orifice 15 and sent to the bearing housing 5 in the turbocharger 2.

In this case, when the third orifice 18 is not provided in the relief passage 19, the amount of oil escaping from the portion 17 between the two orifices 13 and 14 to the oil pan 9 increases, so that the lubricating oil pump 10 in the engine The capacity must be increased by the amount of oil released from this relief passage 19, and if there is no relief passage 19 itself,
It cannot be expected that the hydraulic pressure and oil amount will be regulated by the release of lubricating oil, and only the restriction of the throttling resistance of both orifices 14 and 15 can be achieved.
The diameters of holes 4 and 15 must be small, as there is a risk of clogging the orifice.

In contrast, in the present invention, as described above, both orifices 14 in the lubricating oil supply passage 13 from the engine to the turbocharger 2 are provided.
, 15, part of the lubricating oil is released from the third orifice 18, so the turbo supercharger 2
The hydraulic pressure and amount of lubricating oil can be widely regulated, and there is no need to reduce the diameters of both orifices 14 and 15. On the other hand, the third orifice 18 in the relief passage 19 The amount of oil can be regulated to a small amount.

Note that when the diameter of the first orifice 14 is dl, the diameter of the second orifice 15 is d2, and the diameter of the third orifice 18 is d3, the size relationship may be set as appropriate depending on the characteristics of the engine. , for the tested engine, e2
≧dl and d3≧d1 were appropriate.

As described above, according to the present invention, when lubricating the turbocharger with the lubricating oil applied to the engine, the oil pressure and oil amount of the lubricating oil to the turbocharger can be adjusted to the amount of lubricating oil applied to various operating parts of the engine. When regulating the oil pressure and oil amount to not reduce, the diameter of the orifice can be increased and clogging of the orifice can be avoided, ensuring continuous and reliable lubrication of the turbocharger without running out of oil. In addition, there is no need to increase the capacity of the lubricating oil pump in the engine, and the lubricating oil pump attached to an ordinary engine can be used as is.

[Brief explanation of the drawing]

The drawing is a diagram of an embodiment of the present invention. 1... Engine, 2... Turbo supercharger, 3... Exhaust turbine, 4... Floor compressor, 5... Bearing ... Uzing, 10...
... Lubricating oil pump, 9 ... Oil pan, 1
3... Lubricating oil supply passage, 16... Return passage, 14, 15... Orifice, 19.
...Escape passage, 18...Orifice.

Claims (1)

[Scope of utility model registration request] The lubricating oil supply passage branched from the discharge side of the lubricating oil pump of the engine is connected to the lubricating oil inlet port of the bearing housing of the turbocharger attached to the engine, while the lubricating oil supply passage of the bearing housing of the turbocharger The outlet port is connected to an oil pan in the engine via a return passage, and two orifices are provided in series in the lubricating oil supply passage, and the area between the two orifices is connected to the return passage or the oil pan through an orifice-equipped relief passage. A lubrication system for a turbocharger in an engine that is connected to an oil pan.