JPH051629Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an internal combustion engine with a supercharger, and in particular, an oil separator is installed in the air pipe that extracts the supercharging pressure in the intake pipe as a signal pressure to separate oil. This invention relates to an internal combustion engine with a supercharger that can be recovered into the intake pipe as appropriate.

[Prior Art] Generally, in an internal combustion engine equipped with an exhaust turbo supercharger,
A wastegate valve is provided in the exhaust passage on the turbine side, and the wastegate valve is opened and closed by a diaphragm depending on the boost pressure in the intake pipe, thereby preventing damage to the exhaust turbo supercharger due to overspeeding and damage to the engine due to overcharging. In order to prevent damage to the diaphragm, compressed air after supercharging is guided from the intake pipe on the downstream side of the supercharger to the diaphragm through an air pipe.

[Problems to be solved by the invention] By the way, the air in the intake pipe after being compressed by the supercharger is mixed with oil components such as lubricating oil supplied to the supercharger, and this supercharging If air is directly introduced into the diaphragm through the air pipe, the oil component will damage the diaphragm plate made of silicone rubber, resulting in a loss of durability.

The present invention was developed in consideration of the above circumstances, and its purpose is to provide an air pipe that is capable of separating and recovering oil components contained in the supercharged air in the intake pipe and extracting the resulting pressure as control pressure. An object of the present invention is to provide an internal combustion engine with a supercharger.

In addition, it is equipped with a control pressure outlet that can separate and remove the oil component in the supercharged air and extract the supercharging pressure from the intake pipe as control pressure.
There is an "internal combustion engine with a supercharger" in the -58726 publication.

[Means for Solving the Problems] In order to achieve the above object, the present invention is connected to the intake pipe upstream of the muffling valve, extracts the supercharging pressure in the intake pipe, and transfers it to the actuator of the wastegate valve. An oil separator is provided in the middle of the air pipe introduced into the engine, and the oil separator and the intake pipe downstream of the muffling valve are connected through an oil recovery pipe to form a supercharged internal combustion engine.

[Function] The supercharging pressure in the intake pipe is taken out through the air pipe connected to the intake pipe upstream of the exhaust brake sound muffling valve, and the oil component contained in the supercharging air is absorbed by the oil provided midway through the air pipe. It is separated by a separator and stored there. When the muffling valve is closed at the same time as the exhaust brake is activated, the pressure inside the intake pipe downstream of the muffling valve decreases, and a pressure difference is created between the upstream side and the downstream side of the muffling valve. As a result, the oil stored in the oil separator is sucked back into the intake pipe through the recovery pipe.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, an exhaust turbo supercharger 4 is provided between an intake pipe 2 and an exhaust pipe 3 of an internal combustion engine 1, spanning them. An intake pipe 2 is installed on the exhaust pipe 3 side to prevent damage to the exhaust turbo supercharger 4 due to overspeeding and damage to the internal combustion engine 1 due to overcharging.
A bypass passage 6 is provided that allows a part of the exhaust gas discharged from the internal combustion engine 1 to bypass the turbine 5 side of the exhaust turbo supercharger 4 and flow when the pressure of the supercharged air in the internal combustion engine exceeds a set value. , this bypass passage 6
is provided with a waste gate valve 7 that opens and closes this. The wastegate valve 7 is a diaphragm 8
It is designed to be opened and closed by an actuator consisting of a pressure chamber 9 for operating the diaphragm 8.
The supercharging pressure inside the intake pipe 2 is introduced through the air pipe 10.

On the other hand, in the intake pipe 2 on the downstream side of the blower 11 of the exhaust turbo supercharger 4, there is provided a noise reduction valve 12 made of a butterfly valve that closes simultaneously with the operation of the exhaust brake to reduce the operating noise of the exhaust brake. The control pressure outlet 10a side of the air pipe 10 is connected to the intake pipe 2 upstream of the muffling valve 12.

Incidentally, the air pipe 10 is provided with an oil separator 13 in the middle thereof for separating oil components such as lubricating oil from the exhaust turbo supercharger 4 that are mixed mainly as mist into the supercharged air introduced from the intake pipe 2. is intervened. This oil separator 13
As shown in FIG. 2, it is formed by a box-shaped case body 14 having a certain volume, and an air pipe 10b from the intake pipe 2 side and an air pipe 10c from the diaphragm 8 side are connected to its upper wall 14a. has been done. Air pipe 10b from the intake pipe 2 side
The pipe end is the air pipe 10c on the diaphragm 8 side.
The supercharged air introduced from the intake pipe 2 and containing oil components has its flow direction reversed within the case body 14 and flows toward the diaphragm 8 side. air pipe 1
0c, and at that time, the oil component contained as mist is separated in the direction of gravity and flows into the case body 14.
It is designed to be stored in the lower part of the interior.

Further, an oil recovery pipe 15 is provided on the lower wall 14b of the case body 14 and connects this to the downstream side of the intake pipe 2 near the muffling valve 12, and collects the oil stored in the case body 14 to the intake pipe 2 side. At the connection between the case body 14 and the recovery pipe 15, an on-off valve 16 is provided to open and close the recovery pipe 15a as appropriate. The on-off valve 16 is connected to the recovery port 1 which is opened on the case body 14 side of the connection part.
A valve body 18 is seated in the case body 14 from the recovery pipe 15 side at the bottom wall 14b of the recovery port 17 and the end of the valve rod 19 extending into the bottom wall 14b. A spring 20 is provided which engages and urges the valve body 18 in the seating direction, and opens the valve body 18 when the pressure inside the recovery pipe 15 decreases and the pressure difference with the inside of the case body 14 exceeds a predetermined value. ing.

In the internal combustion engine 1 with an exhaust turbo supercharger configured in this way, the waste gate valve 7 of the bypass passage 6 is opened and closed according to the supercharging pressure in the intake pipe 2, and the waste gate valve 7 of the bypass passage 6 is opened and closed according to the supercharging pressure in the intake pipe 2. When the supercharged air introduced into the operating pressure chamber 9 of the diaphragm 8 passes through an oil separator 13 provided in the middle of the air pipe 10, oil components mixed in as mist are removed. This makes it possible to prevent the diaphragm plate 8a, which is made of silicone rubber or the like, from being damaged by the oil component, such as deterioration, as much as possible.
It will be possible to measure the improvement of its durability.

In addition, the separated oil component is stored in the lower part of the case body 14 of the oil separator 13.
This stored oil is appropriately sucked back into the intake pipe 2 and recovered. That is, when the muffler valve 12 is closed at the same time as the exhaust brake (not shown) is activated, the intake pipe 2 downstream of the muffler valve 12
The internal pressure decreases, and a pressure difference occurs between the upstream side and the downstream side of the muffling valve 12. Therefore, the pressure difference acts on the on-off valve 16 provided at the connection between the case body 14 of the oil separator 13 and the recovery pipe 15, and when the pressure difference exceeds a predetermined value, the spring 2
0 is compressed, the on-off valve 16 is automatically opened, and the oil stored in the lower part of the case body 14 is sucked back into the intake pipe 2 through the recovery pipe 15 and recovered. Also, at this time, it becomes difficult to open the wastegate valve 7, but under the circumstances where the exhaust brake is activated, there is no need to open the wastegate valve 7 in the first place, and engine operation may be hindered. Nothing will happen. Furthermore, when the pressure inside the exhaust pipe 3 rises to a predetermined pressure due to the operation of the exhaust brake and the exhaust brake force starts to be applied, the pressure inside the intake pipe 2 on the downstream side of the muffling valve 12 decreases due to blowback of exhaust gas. As the pressure increases, and the supercharging pressure by the exhaust turbo supercharger 4 also decreases, the pressure difference between the upstream side and the downstream side of the muffling valve 12 gradually decreases, but the pressure that has accumulated in the oil separator 13 Oil silence valve 1
Sufficient suction can be drawn back into the intake pipe 2 within a short time immediately after the intake pipe 2 is closed.

In this embodiment, an oil separator 1 is installed in the air pipe 10 for supplying control pressure to the diaphragm 8 of the waste gate valve 7 of the exhaust turbo supercharger 4.
3 is shown, but when the supercharging pressure inside the intake pipe 2 exceeds a set value, the air pipe for the relief valve (not shown) is used to release the supercharging pressure to the outside of the intake pipe 2. In addition, the above-mentioned oil separator 13 may be interposed in the air pipe for extracting supercharging pressure as control pressure, and the supercharger may be a mechanically driven supercharger such as a Roots type. good.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) An oil separator is installed on the air pipe for taking out the supercharged air in the intake pipe as control pressure, so the oil component contained in the supercharged air is separated and removed from the supercharged air that is introduced to actuators such as diaphragms as control pressure. The oil component can be stored in the oil separator.

(3) Since oil components can be removed from supercharged air and the supercharged air can be introduced as control pressure into actuators such as diaphragms, members made of silicone rubber materials such as diaphragm plates can be Damage such as deterioration due to heating can be prevented as much as possible, and durability can be improved.

(3) A recovery pipe for the oil stored in the oil separator is connected between the lower part of the oil separator and the intake pipe on the downstream side of the valve that suppresses the sound of exhaust brake operation. The oil stored in the oil separator can be collected into the intake pipe.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a preferred embodiment of a supercharged internal combustion engine according to the present invention, and FIG. 2 is a sectional view of an oil separator shown in FIG. 1. In the figure, 1 is an internal combustion engine, 2 is an intake pipe, 4 is a supercharger, 10 is an air pipe, 12 is a silence valve, 13
14 is an oil separator, 14 is a case body, 15 is a recovery pipe, and 16 is an on-off valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An oil separator is installed in the middle of an air pipe that is connected to the intake pipe upstream of the silencer valve, takes out the supercharging pressure in the intake pipe, and introduces it to the actuator of the wastegate valve. An internal combustion engine with a supercharger, characterized in that the oil separator and the intake pipe downstream of the muffling valve are connected by an oil recovery pipe. (2) The recovery pipe is connected to the lower part of the main body case of the oil separator, and when the pressure inside the recovery pipe decreases and the pressure difference between the pressure inside the case and the pressure inside the case exceeds a predetermined value, the recovery pipe is closed. An internal combustion engine with a supercharger according to claim 1 of the above-mentioned utility model registration claim, which has an on-off valve that opens.