JPS6231632Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust turbo compound engine.

The configuration of a conventional exhaust turbo compound engine of this type is shown in FIG. In the figure, 01 is an engine body, 02 is a crankshaft, 03 is an exhaust turbo supercharger, 04 is a recovery turbine, and 05 is a reduction gear housing, which are attached to the engine body 01. 06 is the reduction gear train, and the reduction gear housing 0
It is housed within 5. 07 is a ring gear, which is mounted on the same axis as the crankshaft 02. 0
A lubricating oil supply line 8 is led from the lubricating oil supply line of the engine body and communicates with each reduction gear train 06. Reference numeral 09 denotes an opening, which is provided at the joint between the reduction gear train 06 and the ring gear 07 of the reduction gear housing 05, that is, at the joint between the reduction gear housing 06 and the engine body 01.

Exhaust gas discharged from the engine body 01 is guided to an exhaust turbo supercharger 03, and then a recovery turbine 0
4. There, a turbine rotor (not shown) is driven and the gas is discharged.

The output obtained by the recovery turbine 04 is transmitted to the ring gear 07 via the deceleration rotational movement of the reduction gear train 06, and then taken out as an output to the crankshaft 02. Therefore, the output of the recovery turbine 04 is added to the output from the engine main body, resulting in higher engine output and lower fuel consumption.

Since the reduction gear train 06 rotates at high speed and under high load, it is necessary to supply lubricating oil to the tooth surfaces of the gears and each bearing. It is guided to each part of the reduction gear train 06 through the transmission line.

The lubricating oil that has passed through each part of the reduction gear train 06 falls to the lower part of the reduction gear housing 05 and is stored therein, and is then returned through the opening 09 into the crankcase of the engine body 01 (not shown).

However, the above method has the following drawbacks.

By forming the reducer housing 05 into a compact package shape, the overall weight and cost can be reduced, but for this purpose, it is desirable to reduce the opening area of the opening 09 as much as possible and attach it to the engine body 01.

However, since the end of the high-speed reduction gear train 06 and the ring gear 07 are rotating in this opening, the lubricating oil discharged is stirred up and the reduction gear housing 0
Reducer housing 0 to draw in air inside 5
Since the pressure inside 5 becomes a negative pressure and the area of the opening 09 is also small, the ability to discharge lubricating oil is not sufficient. For this reason, lubricating oil accumulates inside the reducer housing 05,
The oil level has risen, causing the reduction gear train 06 to stir up the lubricating oil.

For this reason, the power transmission efficiency of the reduction gear train 06 decreases, and most of the output recovered from the recovery turbine 04 becomes a loss and is not returned to the crankshaft 02, making it difficult to achieve high engine output and low fuel consumption. I can't get it.

The purpose of this invention is to focus on the above points and provide an exhaust turbo compound engine that can improve the power transmission efficiency of the reduction gear train and achieve low fuel consumption and high output of the engine. The reduction gear train is housed in a reduction gear housing and connects the output shaft of the recovery turbine with a ring gear mounted on the crankshaft of the engine, and the reduction gear train is connected to the reduction gear housing through which lubricating oil is led from a lubricating oil supply line of the engine body. and a lubricating device for the reduction gear train, which is returned to the crankcase of the engine through an opening provided in a joint with the engine body, the upper part of the reduction gear housing and the upper part of the engine crankcase. It is equipped with a ventilation passage that communicates with the

That is, by supplying air from the crankcase into the reducer housing through the ventilation passage, negative pressure generated within the reducer housing is reduced, and lubricating oil is smoothly discharged from the reducer housing.
This improves the power transmission efficiency of the reduction gear train.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an explanatory diagram showing a cross section of a reduction gear train according to an embodiment of the present invention.

In the figure, 02 is the crankshaft, 05 is the reducer housing, 06 is the reduction gear train, 07 is the ring gear, 08 is the lubricating oil supply line, and 09 is the opening, all of which are the same members as in FIG. 1 showing the conventional example. .

101 is a ventilation opening hole, and the reducer housing 05
is located at the top of the.

Reference numeral 102 denotes a conduit, that is, a ventilation passage, which has one end opened in the upper part of the engine crankcase (not shown) and the other end connected to the ventilation opening hole 101. That is, the upper part of the crankcase and the upper part of the reduction gear housing are communicated with each other. Note that arrow A indicates power transmission from the recovery turbine.

The operation in the case of the above configuration will be described.

The opening 09 of the reducer housing provided at the joint between the reduction gear train 06 and the ring gear 07 has a small opening area, and the gears of the ring gear 07 and the reduction gear train 06 rotate at high speed. 05 flows into the crankcase (not shown). Therefore, the pressure inside the reducer housing 05 becomes negative, but since air is introduced into the reducer housing 05 through the ventilation opening hole 101, the negative pressure inside the housing 05 is reduced, and the opening 09 is reduced accordingly. The lubricating oil that passes through can be discharged smoothly, reducing the speed of the reducer housing 05.
The height of the lower lubricating oil surface B is reduced, and stirring of the lubricating oil due to rotation of the reduction gear train 06 can be prevented.

The above case has the following effects.

Since stirring loss of lubricating oil by the reduction gear train 06 is eliminated, the power transmission efficiency of the reduction gear train 06 can be improved, and the exhaust turbo compound engine can achieve lower fuel consumption and higher output.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the configuration of a conventional exhaust turbo compound engine, and Figure 2 is an explanatory diagram showing the configuration of a conventional exhaust turbo compound engine.
It is an explanatory view showing a reduction gear train of an example in cross section. 05... Reduction gear housing, 06... Reduction gear train, 07... Ring gear, 08... Lubricating oil supply line, 09... Opening, 101... Ventilation opening hole, 1
02... Ventilation path.

Claims (1)

[Scope of utility model registration request] A reduction gear train is housed in the reduction gear housing and connects the output shaft of the recovery turbine with a ring gear attached to the crankshaft of the engine, and lubricating oil is introduced from the lubricating oil supply line of the engine body to connect the reduction gear housing and the engine. and a lubricating device for the reduction gear train that is returned into the crankcase of the engine through an opening provided at a joint with the main body, wherein the upper part of the reduction gear housing and the upper part of the crankcase of the engine. An exhaust turbo compound engine characterized by having a ventilation passage that communicates with the engine.