JP2007291914A - Lubricating device for engine with supercharger and air cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating device for an engine with supercharger and air cooler, in which an approach between an oil delivery passage from an oil delivery port of a supercharger and an exhaust pipe around an exhaust turbine is prevented, and the possibility of leakage oil catching fire coupled with the approach is prevented, so as to improve safeness, and the need of any special device for lubricating a teeth part of a timing gear is eliminated so as to simplify structure of a timing gear lubricating device and to reduce a cost. <P>SOLUTION: An inner passage for oil in which the oil flows is formed in an air cooler case, and an oil passage for connecting an inlet of the inner passage and the exhaust turbocharger with the oil delivery port of the supercharger from which the oil after lubrication is discharged. The oil from the oil delivery port of the supercharger is delivered from an oil outlet opened to the inner passage into a gear case, after passing through the inner passage of the air cooler. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is mainly applied to a diesel engine provided with an exhaust turbocharger and an air cooler, and is provided with an exhaust turbocharger and an air cooler, and the exhaust oil of the supercharger is air-cooled. The present invention relates to a lubricating device for an engine configured to be discharged to the outside after passing through an oil internal passage of the vessel.

In a diesel engine equipped with an exhaust turbocharger, the oil after lubricating the turbocharger is usually passed along with the engine oil system from the oil outlet provided at the bottom of the bearing box of the turbocharger through the oil drain pipe. The oil is drained into the oil pan.
Patent Document 1 (Japanese Utility Model Laid-Open No. 6-58132) discloses a flywheel housing in which oil after lubricating a supercharger is passed through an oil discharge pipe from an oil discharge port provided at the bottom of the supercharger. There is disclosed a lubricating device for an engine with a supercharger configured to drain the oil pan through a gap formed between the crankcase and the crankcase to shorten the length of the supercharger drain oil pipe.

Japanese Utility Model Publication No. 6-58132

In a diesel engine equipped with an exhaust turbocharger and an air cooler, conventionally, the oil after lubricating the turbocharger is provided at the bottom of the bearing box of the turbocharger as described above. The oil is discharged from the oil discharge port through the oil discharge pipe into the oil pan together with the engine oil discharge system.
For this reason, in the conventional apparatus and the apparatus provided in Patent Document 1 (Japanese Utility Model Publication No. 6-58132), the oil is removed from the bearing box fastened to the turbine case of the exhaust turbine that is at a high temperature. The oil drain pipe connected to the pan is disposed close to the exhaust pipe routed around the exhaust turbine.

  Therefore, in the conventional apparatus and the apparatus provided in Patent Document 1, as described above, the oil drain pipe connected from the bearing box to the oil pan approaches the exhaust pipe routed around the exhaust turbine. Therefore, when the oil drain pipe is damaged or oil leaks from the oil drain pipe system, the leaked oil may be ignited by the heat of the exhaust pipe.

  On the other hand, particularly in a high-speed diesel engine, since the contact pressure of the meshing tooth portion of the timing gear meshing with a plurality of gears is large and the meshing portion is heated, conventionally, oil ( Lubricating oil) is supplied for lubrication and cooling. For this reason, in this engine, in addition to the oil supply system and the exhaust oil system of the supercharger, a special lubricating oil supply means for lubricating the tooth portion of the timing gear is required, and the structure is complicated. Lubricating oil system with many parts and high cost.

  In view of the problems of the prior art, the present invention reliably prevents the oil passage from the oil discharge port of the turbocharger and the exhaust pipe around the exhaust turbine from approaching and the possibility of igniting the leaked oil. Providing a lubrication device for a turbocharger and an engine with an air cooler that improves safety and reduces the cost by simplifying the structure of the timing gear lubrication device by eliminating the need for a special device for timing gear tooth lubrication. The purpose is to do.

  The present invention achieves such an object, an engine having an exhaust turbocharger and an air cooler, wherein an oil internal passage through which oil flows is formed inside the case of the air cooler, An oil passage is provided to connect the inlet of the oil internal passage and the oil discharge port of the supercharger from which oil after lubricating the exhaust turbocharger is discharged, and the oil from the oil discharge port of the supercharger is supplied. The air cooler is configured to be discharged to the outside through an oil outlet opened in the oil internal passage after passing through the oil internal passage of the air cooler (Claim 1).

In this invention, specifically, the following configuration is preferable.
(1) An oil discharge passage connected from the oil outlet of the oil internal passage of the air cooler to the engine gear case is provided.
(2) In the air cooler, a cooling element is arranged in the direction of the crankshaft of the engine, the exhaust turbocharger is installed above the air cooler, and the oil internal passage of the air cooler is air-cooled An oil passage extending from the oil discharge port of the supercharger to the middle in the longitudinal direction of the oil internal passage, and extending to both ends of the oil internal passage in the crankshaft direction. The oil outlet is provided (Claim 3).

  According to the present invention, an oil internal passage is integrally formed inside the case of the air cooler, and the oil internal passage is connected to the oil passage from the exhaust port of the exhaust turbocharger, preferably the air cooler. Exhaust turbocharger having an oil internal passage extending in the crankshaft direction inside the case and providing oil outlets at both ends of the oil internal passage in the crankshaft direction and disposed above the oil internal passage and the air cooler The oil passage from the oil discharge port is connected to the oil passage (Claim 3), and the oil after lubricating the turbocharger passes through the oil internal passage integrally formed in the case of the air cooler, and then the oil internal passage. Since the oil outlets opened at both ends in the crankshaft direction of the engine are preferably discharged into the gear case of the engine (claim 2), the turbocharger lubrication from the oil exhaust port of the exhaust turbocharger Through the oil internal passage integrally formed in the case of the air cooler disposed in the vicinity of the turbocharger, and oil outlets at both ends of the oil internal passage in the crankshaft direction. Therefore, the oil passage from the exhaust port of the exhaust turbocharger is prevented from approaching the exhaust pipe routed around the exhaust turbine.

  As a result, the oil drain pipe connected to the oil pan from the bearing box, which is a problem of the conventional device as in Patent Document 1, is disposed close to the exhaust pipe routed around the exhaust turbine. Thus, when the oil drain pipe is broken or oil leaks from the oil drain pipe system, there is no possibility of the leaked oil being ignited by the heat of the exhaust pipe, and safety is improved.

In addition, since the exhaust oil passage of the exhaust turbocharger connected to the inside of the gear case through the oil internal passage integrally formed in the case of the air cooler from the oil discharge port of the exhaust turbocharger is formed, The oil external piping of the turbocharger exhaust oil compared to the oil exhaust passage that drains oil into the oil pan along with the engine oil drain system through the oil drain pipe from the bottom drain port of the bearing box of the turbocharger In addition, the supercharger drain oil is introduced into the gear case to lubricate the timing gear teeth so that the supercharger lubricated oil can be effectively used to lubricate the timing gear teeth. In addition, a special lubricating oil supply means for lubricating the timing gear teeth as in the conventional apparatus is not required.
Thereby, lubrication of the turbocharger and lubrication of the teeth of the timing gear can be performed together by means of an extremely simple structure and low cost with a small number of parts.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 is a side view of a main portion of a lubricating device in the vicinity of a turbocharger and an air cooler of a diesel engine with an exhaust turbocharger and an air cooler according to an embodiment of the present invention, and FIG. 2 is a line AA in FIG. FIG. 3 is a sectional view taken along the line BB in FIG.
1-3, 1 is a crankcase, 11 is a front gear case fixed to the front portion of the crankcase 1, and 10 is a rear gear case fixed to the rear portion of the crankcase 1, and the front gear case 11 and the rear gear case are shown. A timing gear (not shown) made up of a plurality of gears is accommodated in the interior of 10.

Reference numeral 2 denotes a supercharger (exhaust turbocharger). In this example, two units (one unit or three units in a row) may be provided along the axial direction of the engine. It is fixed with bolts (not shown). 2a is a turbine of the supercharger 2, 2c is a compressor, and 2b is a bearing box for connecting the turbine 2a and the compressor 2c. Reference numeral 38 denotes an exhaust duct where exhaust gases at the outlets of the turbines 2a merge.
Reference numeral 4 denotes an oil discharge port provided at the bottom of the bearing box 2b of each of the superchargers 2 (two), and 5a and 5b denote oil discharge pipes connected to the respective oil discharge ports 4 (details will be described later). ).

  Reference numeral 3 denotes an air cooler, which is provided immediately below the superchargers (exhaust turbochargers) 2 and 2 so that the two cooling elements 32 and 32 (see FIG. 2) are in the direction of the crankshaft of the engine. is set up. Reference numeral 34 denotes a water passage through which the cooling water flows, and extends in the crankshaft direction inside the case 31 of the air cooler 3 as shown in FIG. A plurality (three in this example) of water passages 34 are provided symmetrically with respect to the center in the width direction of the air cooler 3 (the center in the direction perpendicular to the crankshaft center) 3z. 35 is an air cooler case cover, and the air cooler case cover 35 forms an air passage connecting the air outlet of the superchargers 2, 2 and the air inlet of the air cooler 3.

As shown in FIG. 3, an oil internal passage 33 extends integrally with the case 31 in the case 31 of the air cooler 3 in the crankshaft direction and substantially in parallel with the water passage 34. .
Further, two oil internal passages 33 are provided on one side with respect to the center in the width direction of the air cooler 3 (center in the direction perpendicular to the crankshaft center) 3z, or symmetrically with respect to the center 3z as necessary. .
Reference numerals 5a and 5b denote oil drain pipes that connect the oil drain ports 4 and 4 of the bearing box 2b of each of the superchargers 2 and 2 and the longitudinal intermediate portion of the oil internal passage 33. Reference numerals 6a and 6b denote flanges for fastening the oil drain pipes 5a and 5b to the case 31 of the air cooler 3.
7a is an oil drainage passage (7c is a fastening flange) connecting the crankshaft front end of the oil internal passage 33 and the inside of the front gear case 11, and 7b is a crankshaft rear end of the oil internal passage 33. An oil drainage passage (7d is a fastening flange) connecting the inside of the rear gear case 10.

During operation of a diesel engine having such a configuration, the oil accumulated in the bottom of the bearing housings 2b and 2b of each of the superchargers 2 and 2 is discharged from the oil discharge ports 4 and 4 of each bearing housing 2b. 5b, passes through the oil discharge pipes 5a and 5b, enters the oil internal passage 33 of the air cooler 3, and flows through the oil internal passage 33 in the longitudinal direction (crankshaft direction).
The oil flowing out from the front end outlet and the rear end outlet of the oil internal passage 33 is respectively introduced into the front gear case 11 and the rear gear case 10 through the oil discharge passage 7a and the oil discharge passage 7b. Then, it is dropped toward the tooth portion of the timing gear housed inside the front gear case 11 or the rear gear case 10, and after the tooth portion is lubricated and cooled, it is discharged to an oil pan (not shown).

  According to this embodiment, the oil internal passage 33 is integrally formed in the crankshaft direction inside the case 31 of the air cooler 3, and the exhaust turbocharger disposed above the oil internal passage 33 and the air cooler 3. The oil discharge pipes 5a and 5b from the oil discharge port 4 of the feeder 2 are connected, and the oil outlets at both ends in the crankshaft direction of the oil internal passage 33 are connected to the front gear case 11 and the rear gear case via the oil discharge passages 7a and 7b. The case of the air cooler 3 in which the oil after lubrication of the supercharger from the oil discharge port 4 of the supercharger 2 is disposed in the vicinity immediately below the supercharger. 31 is passed through the oil internal passage 33 integrally formed in the interior of the engine 31 and discharged from the oil outlets at both ends of the oil internal passage 33 in the crankshaft direction into the front gear case 11 and the rear gear case 10. Oil passage from the oil discharge port 4 of the supercharger 2 is avoided that close to the exhaust pipe which is Torimawasa the exhaust turbine of the turbocharger 2.

  As a result, the drainage pipe connected to the oil pan from the bearing box 2b of the supercharger 2, which is a problem of the conventional apparatus as in Patent Document 1, is connected to the exhaust turbine 2 of the supercharger 2 and the supercharger. Due to the arrangement close to the exhaust pipe routed around the machine 2, when the oil drain pipe is damaged or oil leaks from the oil drain pipe system, the leaked oil can be ignited by the heat of the exhaust pipe. Safety can be absolutely eliminated and safety is improved.

Further, oil discharge passages 7a connected to the inside of the front gear case 11 and the rear gear case 10 through the oil internal passage 33 integrally formed in the case 31 of the air cooler 3 from the oil discharge port 4 of the supercharger 2. 7b is formed, so that the oil drainage passage is drained from the bottom drainage port 4 of the bearing box 2b of the turbocharger 2 through the oil drainage pipe and into the oil pan together with the engine oil drainage system as in the conventional device. Compared with this, it is possible to greatly shorten the oil external piping of the supercharger exhaust oil, and to introduce the supercharger exhaust oil into the front gear case 11 and the rear gear case 10 to lubricate the timing gear teeth, thereby providing a supercharger. The drained oil after lubrication can be effectively used for the lubrication of the tooth portion of the timing gear, and no special lubricating oil supply means for lubricating the tooth portion of the timing gear as in the conventional device is required. .
Thereby, lubrication of the supercharger and lubrication of the teeth of the timing gear can be performed together by means of an extremely simple structure with a small number of parts and low cost.

  According to the present invention, safety is improved by reliably preventing the approach between the oil discharge passage from the oil discharge port of the turbocharger and the exhaust pipe around the exhaust turbine and the accompanying ignition of leaked oil. In addition, there can be provided a lubricating device for a turbocharger and an engine with an air cooler that eliminates the need for a special device for lubricating the timing gear teeth and simplifies the structure of the timing gear lubricating device and reduces the cost.

It is a principal part side view of the lubrication apparatus of the supercharger and air cooler vicinity of the exhaust-gas turbocharger which concerns on the Example of this invention, and the diesel engine with an air cooler. It is the sectional view on the AA line in FIG. FIG. 3 is a sectional view taken along line BB in FIG. 2.

Explanation of symbols

1 Crankcase 2 Turbocharger (exhaust turbocharger)
2a Turbine 2b Bearing box 2c Compressor 3 Air cooler 4 Oil outlet 5a, 5b Oil drain pipe 7a, 7b Oil drain passage 10 Rear gear case 11 Front gear case 31 Air cooler case 32 Element 33 Oil internal passage 34 Water passage 35 Air cooler Case cover

Claims (3)

  An engine having an exhaust turbocharger and an air cooler, wherein an oil internal passage through which oil flows is formed inside a case of the air cooler, and an inlet of the oil internal passage and the exhaust turbocharger are formed. An oil passage is provided to connect the oil outlet of the supercharger from which oil after lubricating the feeder is discharged, and the oil from the oil outlet of the supercharger passes through the oil internal passage of the air cooler. A lubrication device for a supercharger and an engine with an air cooler, characterized in that the oil is discharged from an oil outlet opened in the oil internal passage.   2. The lubricating device for a supercharger and an engine with an air cooler according to claim 1, further comprising an oil discharge passage connected from an oil outlet of an oil internal passage of the air cooler to an inside of an engine gear case. In the air cooler, a cooling element is disposed in the direction of the crankshaft of the engine, the exhaust turbocharger is installed above the air cooler, and an oil internal passage of the air cooler is connected to an air cooler case. An oil passage extending in the crankshaft direction inside is connected to an oil passage from the supercharger oil discharge port at a longitudinal intermediate portion of the oil internal passage, and the oil outlet is connected to both ends of the oil internal passage in the crankshaft direction. 2. A lubricating device for a supercharger and an engine with an air cooler according to claim 1, wherein:

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