JPS5847228Y2 - Turbo gear lubrication system - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lubricating device for a turbocharger.

When a turbocharger is installed in an engine, it is necessary to lubricate the bearings of the turbocharger. Therefore, the oil pump is used to supply lubricating oil from the oil pan to each part of the engine via the oil cooler and filter. The oil supply passage to the charger is branched, and the oil that has finished lubricating the turbocharger is returned to the oil pan.

(See, for example, Japanese Utility Model Application No. 50-40947.) At that time, the exhaust gas flowing through the turbocharger causes the temperature of the oil that lubricates the turbocharger to rise significantly.

If the temperature of the oil exceeds a permissible value due to this temperature increase, the oil will rapidly deteriorate and damage the engine's sliding parts.

To overcome this drawback, it is necessary to increase the capacity of the main cooler installed in the lubricating oil passage to cool the entire oil, improve cooling performance, and lower the oil temperature. With water-cooled oil coolers, the temperature does not drop below the cooling water temperature, and it is necessary to change the radiator etc. in order to lower the cooling water temperature.

This idea was made in view of the above problem, and in addition to the main cooler that cools the entire oil, a simple auxiliary oil cooler is provided for the turbocharger, and the oil is cooled by the main cooler that is supplied to the turbocharger. The temperature of the oil discharged from the turbocharger is suppressed by further lowering the temperature of the oil discharged from the turbocharger, and the turbocharger is provided outside the engine, and the lubricating oil passage for the turbocharger is exposed to the outside. In this way, it is an object of the present invention to provide a lubricating device for a turbocharger, which is characterized in that the auxiliary oil cooler is an air-cooled type, and the oil can be cooled easily and inexpensively.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

The engine lubrication system is the same as the conventional one, with an oil pump 1 pumping oil from an oil pan 2 and communicating with each sliding part of the engine through a lubrication oil passage 5 with a water-cooled main cooler 3 and a main filter 4 interposed. Manifold 6
The oil is supplied to the oil pan 2 to lubricate each sliding part of the engine (for example, bearings, cams, tappets, pistons, etc.), and the lubricated oil is returned to the oil pan 2.

A turbocharger branch passage 8 is provided downstream of the main oil cooler 3 and main filter 4 of the lubricating oil passage 5 to supply lubricating oil to the turbocharger γ, and the turbocharger 1 has been lubricated. Oil is returned to oil pan 2.

Since the turbocharger γ is provided outside the engine, the branch passage 8 is also exposed inside the engine room outside the engine, and is in contact with the outside air flowing inside the engine room.

A turbocharger filter 9 and an air-cooled auxiliary oil cooler 10 for the turbocharger are sequentially provided in the branch passage 8 from the upstream side.

The auxiliary oil cooler 10 has a lubricating oil passage formed of a metal tube with fins on its outer periphery to increase the heat dissipation area of the metal tube in contact with the outside air, thereby cooling the lubricating oil with air.

Incidentally, when the target oil temperature drop by the auxiliary oil cooler 10 is small, the auxiliary oil cooler 10 may be constructed of a metal snake MW, or the like.

The turbocharger filter 9 has a smaller diameter than the main filter 4, and filters particulate impurities such as carbon that are constantly generated during engine operation, and damages the bearings of the turbocharger 7 due to carbon etc. At the same time, the hydraulic pressure of the oil that is force-fed to the turbocharger γ is lowered to prevent oil leakage from the turbocharger.

The turbocharger filter and auxiliary oil cooler described above may be integrated as shown in FIG.

The filter/cooler 11 includes a metal filter container 12
A fin 13 is provided protrudingly on the outer periphery of the container 12, and a spiral oil passage 12a is provided inside the container 12 along the container 12.
The container 12 and the fins 13 dissipate heat from the oil and cool the oil inside the container 12, while at the same time filtering the oil with a filter 14 installed inside the container 12 to remove carbon and the like and lower the oil pressure.

As described above, when the auxiliary oil cooler 10 is provided in the branch passage 8 to the turbocharger T, the oil fed to the turbocharger is cooled in advance, so the temperature of the oil in the turbocharger 1 is increased. Therefore, the temperature of the oil flowing back to the oil pan 2 does not exceed the allowable temperature.

Therefore, when the oil in the oil pan 2 is supplied to various parts of the engine via the lubricating oil passage 5 by the oil pump 1, if the oil is cooled by the main oil cooler 3, which has the same capacity as before, it will be cooled to the required temperature. It will be done.

The main oil cooler 3 is provided with a bypass passage 15 and a bypass valve 16 that bypass the oil when the temperature of the oil fed from the oil pan 2 is low and the viscosity is high. is opened to allow oil to bypass the main oil cooler 3 and prevent damage to the main oil cooler 3.

As is clear from the above explanation, according to the turbocharger lubrication device according to this invention, an auxiliary oil cooler for the turbocharger is provided separately from the main oil cooler, so that excessive oil rise in the turbocharger is prevented. It is possible to prevent oil deterioration and damage to the engine sliding parts that supply the oil.

In addition, since the turbocharger is mounted outside the engine and the oil passage for the turbocharger is also exposed to the outside and comes into contact with the outside air, an air-cooled oil cooler can be installed extremely easily and can be installed at low cost without taking up much space. In addition, when the filter is integrated with the filter, the above effect becomes even greater.

[Brief explanation of the drawing]

Figure 1 is a lubricating oil circuit diagram showing one embodiment of this invention;
The figure is a schematic diagram showing an embodiment in which an auxiliary oil cooler and a filter are integrated. 1...Oil pump, 2...Oil pan, 3...
Main oil cooler, 4... Main filter, 5.
...Lubricating oil passage, γ...Turbocharger, 8...
Branch passage, 9...turbocharger filter 1
0... Auxiliary oil cooler, 11... Auxiliary oil cooler and filter.

Claims (1)

[Scope of Claim for Utility Model Registration] A lubricating device for a lubricator, characterized in that a branch passage for supplying lubricating oil to a turbocharger is provided, and an air-cooled auxiliary oil cooler is provided in the branch passage. (2) A filter is installed in the auxiliary oil cooler. A lubrication device for a turbocharger as claimed in claim 1, characterized in that the device is integrally incorporated.