JP2007218224A - Lubricating device of engine with turbocharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating device of an engine with a turbocharger, capable of simultaneously lubricating the turbocharger and a tooth part of timing gears by an inexpensive device with a simple structure of reducing the number of part items, by lubricating the meshing tooth part of the timing gears without arranging a special device, in the engine with an exhaust turbocharger in the form of lubricating the meshing tooth part of the timing gears. <P>SOLUTION: This engine with the exhaust turbocharger is provided with a drain oil passage for connecting a drain oil port of the turbocharger discharging oil after lubricating the exhaust turbocharger to a drain oil inlet arranged in a gear case for storing a plurality of timing gears, and is characterized by being constituted so as to lubricate the timing gears by introducing the oil after lubricating the turbocharger into a gear chamber inside of the gear case from the drain oil inlet via the drain oil passage. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an engine that is mainly applied to a diesel engine with an exhaust turbocharger and is provided with an exhaust turbocharger and that lubricates a meshing tooth portion of a timing gear.

In a diesel engine with an exhaust turbocharger, conventionally, the oil after lubricating the turbocharger passes through an oil discharge pipe from an oil discharge port provided at the bottom of the bearing box of the turbocharger, and the oil discharge system of the engine At the same time, the oil is drained into the oil pan.
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, oil (lubricating oil) is supplied to the meshing tooth portion for lubrication and Cooling is performed.
Accordingly, in a diesel engine with an exhaust turbocharger, in an engine of a type that performs lubrication of the meshing tooth portion of the timing gear, generally, an oil supply system and a drainage system of the supercharger and a lubrication system of the tooth portion of the timing gear Is composed of separate lubricating oil systems.

  As an example of a gear lubrication mechanism in which a lubricating oil passage communicating from the inner periphery of the tooth to the tooth tip is formed for each gear tooth and forcedly lubricated to the meshing portion of the tooth, Patent Document 1 (Japanese Patent Laid-Open No. 11-294568). Technology).

JP 11-294568 A

As described above, in an engine with an exhaust turbocharger that lubricates timing gear meshing teeth, conventionally, an oil supply system and a drainage system of the turbocharger, and a lubrication system of the timing gear teeth In addition to installing a separate lubricating oil system, the exhaust oil from the turbocharger is drained into the oil pan along with the engine oil, and a unique lubricating means is installed to lubricate the timing gear teeth. It was.
For this reason, in such an engine with an exhaust turbocharger, 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. As a result, the structure is complicated, the number of parts is large, and the cost is high.

  Further, in the means of Patent Document 1, an oil passage is formed for each gear tooth and forced oiling is performed, so that the number of processing steps of the oil passage is increased, the processing cost of the gear is increased, and the gear meshing portion lubrication is performed. For this reason, a special forced oiling means is required, and the cost of the device for lubricating the meshing portion of the gear also increases.

  SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention enables lubrication of timing gear meshing teeth without providing a special device in an engine equipped with an exhaust turbocharger that lubricates timing gear meshing teeth. An object of the present invention is to provide a lubrication device for a turbocharged engine with a simple structure with a small number of parts and capable of performing both lubrication of a supercharger and lubrication of timing gear teeth with a low-cost device. And

The present invention achieves such an object, and is an engine equipped with an exhaust turbocharger, which discharges oil (lubricating oil) after lubricating the exhaust turbocharger. And an oil discharge passage provided in a gear case in which a plurality of timing gears are housed, and an oil passage through which the lubricating oil is lubricated from the oil supply passage through the oil passage. The timing gear is lubricated by being introduced into an internal gear chamber (claim 1).
In this invention, preferably, the oil drain inlet is opened in the upper wall of the gear case, and the oil introduced into the oil drain inlet is dropped from the oil drain inlet toward the tooth portion of the timing gear. (Claim 2).

According to this invention, the oil after lubricating the turbocharger is introduced into the gear chamber inside the gear case to lubricate the teeth of the timing gear (claim 2). Can be effectively used to lubricate the teeth of the timing gear, and the oil drain pipe from the turbocharger that has been connected to the oil pan side in the past is connected to the oil exhaust inlet provided in the gear case. No special lubrication oil supply means for gear tooth lubrication is required, and the structure of the supercharger and the timing gear teeth are reduced with a very simple structure and low cost. Lubricating can be performed together.
Further, since the lubrication of the supercharger and the lubrication of the teeth of the timing gear can be carried out at the same time, the oil is supplied more than the oil supplied separately to the lubrication of the turbocharger and the lubrication of the teeth of the timing gear. The amount used can be reduced.

  In addition, by opening the drain oil inlet on the upper wall of the gear case, the oil introduced into the drain oil inlet is configured to fall from the drain oil inlet toward the tooth portion of the timing gear (claim). Item 2), it is possible to lubricate the timing gear teeth by simply dropping the oil from the oil discharge inlet toward the timing gear teeth, and a simple structure without using forced oiling means such as an oil jet. Thus, the teeth of the timing gear can be sufficiently lubricated.

In this invention, preferably, a plurality of the exhaust turbochargers are provided, and a plurality of the oil passages are provided in the oil outlets provided for the respective superchargers at the bottom of the bearing box of each supercharger. The inlet ends are connected to each other, and the plurality of oil outlets on the upper wall of the gear case respectively connected to the outlet ends of the plurality of oil drain passages are arranged in the gear train direction of the plurality of timing gears. .
If comprised in this way, it will lubricate the meshing part of several timing gears uniformly by supplying oil to the tooth part of several timing gears simultaneously from the oil drain port arrange | positioned in the gear train direction of several timing gears. it can.

  According to the present invention, the oil after lubricating the turbocharger is introduced into the gear chamber inside the gear case to lubricate the teeth of the timing gear. For lubrication of timing gear teeth, which can be used effectively for lubrication and connects the oil drain pipe from the turbocharger that was previously connected to the oil pan to the oil drain inlet provided in the gear case. The lubrication of the turbocharger and the gear teeth of the timing gear are performed together with a very simple structure with a low number of parts and a low cost. Can do.

  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.

1 is a side view of a main part of a lubricating device for a turbocharger and a timing gear of a diesel engine with an exhaust turbocharger according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. It is the BB sectional view taken on the line in FIG.
1-3, 100 is a crankcase, 1 is a gear case fixed to the front end portion or the rear end portion of the crankcase 100, and the gear chamber 11 inside the gear case 1 has a gear case 11 as shown in FIGS. A timing gear 10 composed of a plurality of gears is accommodated.
2 is a turbocharger (exhaust turbocharger), and in this example, two rows (two in total, one or three in one row) may be provided along the axial direction of the engine. It is fixed to the upper surface of 100 with a plurality of 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 3 denotes an exhaust duct where exhaust gases at the outlets of the turbines 2a merge.

4 is an oil drain port provided at the bottom of the bearing box 2b of each of the superchargers 2 (four units), and 5 is four oil drain pipes connected to each of the oil drain ports 4, respectively. 3, the outlet end of each oil drain pipe 5 is connected to the oil drain inlet 12 opening in the upper wall 1 a of the gear case 1 via the flange 6 and the gasket 13. Reference numeral 7 denotes a clamp of the oil drain pipe 5.
In this way, by opening the drain oil inlet 12 in the upper wall 1a of the gear case 1, the oil introduced into the drain oil inlet 12 is directed from the drain oil inlet 12 toward the tooth portion 10a of the timing gear 10. It can be dropped.

Further, the four oil discharge inlets 12 are axially centered as shown in FIG. 3 at the center of the tooth width of the tooth portion 10a of the timing gear 10, and as shown in FIG. Arranged in the direction of 10 gear trains and opened.
If comprised in this way, the meshing part of several timing gears 10 will be provided by simultaneously supplying oil to the tooth | gear part 10a of several timing gears 10 from the oil drainage inlet 12 arrange | positioned in the gear train direction of several timing gears 10. FIG. Can be lubricated evenly.

  During operation of the diesel engine having such a configuration, the oil accumulated in the bottom of the bearing box 2b of each supercharger 2 is discharged from the four oil outlets 4 of each bearing box 2b into four oil drain pipes 5. And is guided to the oil discharge inlets 12 opened in the upper wall 1a of the gear case 1 through the oil discharge pipe 5, and the teeth of a plurality of timing gears 10 from the four oil discharge inlets 12 as shown in FIG. After being dropped toward the portion 10a and lubricating and cooling the periphery of the meshing portion of each timing gear 10, it is discharged together with other engine exhaust oil to an oil pan (not shown).

According to this embodiment, the oil after lubricating the supercharger 2 is introduced into the gear chamber 11 inside the gear case 1 to lubricate the meshing portion (tooth portion 10a) of the timing gear 10, so that the supercharger 2 is The drained oil after lubrication can be effectively used for lubrication of the meshing portion of the timing gear 10, and the drainage pipe 5 from the supercharger 2 conventionally connected to the oil pan side is provided with a drain provided in the gear case 1. There is no need for a special lubricating oil supply means for lubricating the meshing portion of the timing gear 10 that is connected to the oil inlet 12, and it has an extremely simple structure with a small number of parts and a low cost means. Lubrication of the feeder 2 and lubrication of the meshing portion of the timing gear 10 can be performed together.
Further, since lubrication of the supercharger 2 and lubrication of the meshing portion of the timing gear 10 can be performed together, oil is separately supplied to lubrication of the supercharger 2 and lubrication of the meshing portion of the timing gear 10. The amount of oil used can be reduced more than that.

  Further, an oil discharge inlet 12 connected to the oil discharge pipe 5 is opened on the upper wall 1a of the gear case 1, and the oil introduced into the oil discharge inlet 12 is fed from the oil discharge inlet 12 to the teeth of the timing gear 10. By being configured to drop toward the portion 10a, it is possible to lubricate the meshing portion of the timing gear 10 only by naturally dropping the oil from the oil discharge inlet 12 toward the tooth portion 10a of the timing gear 10. Thus, the meshing portion of the timing gear 10 can be sufficiently lubricated with a simple structure without using forced oiling means such as an oil jet.

  According to the present invention, in an engine equipped with an exhaust turbocharger that lubricates timing gear meshing teeth, it is possible to lubricate timing gear meshing teeth without providing a special device, and the number of parts is simple. With the simple structure, it is possible to provide a lubricating device for an engine with a supercharger that can perform both the lubrication of the supercharger and the lubrication of the teeth of the timing gear with a low-cost device.

It is a principal part side view of the supercharger and timing gear lubrication apparatus of the diesel engine with an exhaust turbocharger which concerns on the Example of this invention. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG.

Explanation of symbols

1 Gear case 1a Upper wall 2 Turbocharger (exhaust turbocharger)
2a Turbine 2b Bearing box 2c Compressor 3 Exhaust duct 4 Oil outlet 5 Oil drain pipe 10 Timing gear 10a Tooth part 11 Gear chamber 12 Oil exhaust inlet 100 Crankcase

Claims (3)

  An engine having an exhaust turbocharger, wherein the exhaust turbocharger exhausts oil (lubricating oil) after lubrication, and a gear case that houses a plurality of timing gears An oil drainage passage is provided to connect to a waste oil inlet provided in the engine, and the oil after lubricating the supercharger is introduced from the oil drainage inlet into the gear chamber inside the gear case through the oil drainage passage. A lubricating device for an engine with a supercharger, characterized in that the engine is lubricated.   The drain oil inlet is opened in the upper wall of the gear case, and the oil introduced into the drain oil inlet is configured to drop from the drain oil inlet toward the tooth portion of the timing gear. The engine lubrication device with a supercharger according to claim 1. A plurality of the exhaust turbochargers are provided, and the inlet ends of the plurality of oil discharge passages are respectively connected to the oil discharge ports provided for the respective superchargers at the bottoms of the bearing boxes of the respective superchargers, 3. A turbocharger according to claim 2, wherein a plurality of drainage inlets of the upper wall of the gear case respectively connected to outlet ends of a plurality of drainage passages are arranged in a gear train direction of the plurality of timing gears. Engine lubrication device.

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