JPS6060219A - Turbocharging apparatus for internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent leakage of lubricating oil toward the side of turbines which have rotational sliding parts using no mechanical seal, by providing an oil control valve in a lubricating-oil passage for a subsidiary supercharger, and reducing the quantity of lubricating oil supplied to the subsidiary supercharger when operation of the subsidiary supercharger is stopped or it is turned at a low speed. CONSTITUTION:At the time of low-speed operation of an internal-combustion engine, an oil control valve 31 is turned OFF by a signal from a control unit 37, so that an opening 41 of a sleeve-like member 35 is closed by a valve body 39 of the control valve 31. In this state, lubricating oil is carried to a rotational sliding part 25b through a small hole 33 of the sleeve-like member 35 and a lubricating-oil passage 23b although the quantity of lubricaing oil supplied under pressure is small. As the engine speed is raised gradually, the turning speed of a turbine 3a of a main supercharger 1a and that of a turbine 3b of a subsidiary superchager 1b are also raised. Further, with increasing of the engine speed and the turning speed of the superchargers, the oil control valve 31 is turned ON by the signal given from the control unit 37, so that the opening 41 of the sleeve member 35 is opened by the valve body 39.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internal combustion engine turbocharging device equipped with a main supercharger and a sub-supercharger, and more specifically relates to a turbo-supercharging device for an internal combustion engine equipped with a main supercharger and a sub-supercharger. There is one related to a turbocharging device for an internal combustion engine that can control the amount of lubricating oil supplied to the subsupercharger side according to the operating state (fJ).

[Prior Art] As a conventional turbocharging device for an internal combustion engine, for example, a first
There is something like the one shown in the figure. (Unexamined Japanese Patent Publication No. 56-41417
No.) This supercharged product is connected to the main fG machine 1 which is distributed in parallel.
A and a sub-supercharger gA1 b. The main Jj and sub-supercharging 11a, '11+ turbines 3a and 3b include
The exhaust passage 7 of the internal combustion engine 5 communicates with the compressors 9a and 9b, and the intake passage 11 of the internal combustion engine 5 communicates with the compressors 9a and 9b.
a means turbine 17] 1 to 13a, turbine 3
What is bdo compreturi 9 ()?
-C are connected at b, respectively.

The exhaust passage 7 on the downstream side of the compressor 311 of the sub-supercharger 1b has an exhaust pipe that opens and closes depending on the supercharging pressure Pa generated by the main supercharging gM1a (7). A first gate valve 15 is provided. This jJ
When the supercharging pressure []a is L, the valve 15 is in the open state;
How does the exhaust gas from the turbine flow to the turbine 311?

Further, the downstream side intake passage 11 of the conbrella 1j9b of the sub-supercharger 111b is provided with an intake air relief valve 17 for controlling the discharge of intake air from the compressor 9b.゛9a supercharging pressure P
When the supercharging pressure pa increases, the compressor 9b opens and closes, and as the supercharging pressure pa rises, it becomes a closed state, and the intake air discharged from the compressor 9b is not discharged to the outside.

In the intake passage 11 on the downstream side of the intake air relief ti' 17, there is an intake merging control valve that controls the intake air from the compressor 9b of the sub-supercharging Ml 111 to merge with the intake air from the compressor 9a of the main supercharging 851a. 19 is installed. One of these intake merging control valves controls the supercharging pressure 1 of the turbine 9b.
) I), and when the supercharging pressure 1) b reaches one arm, the valve is opened and the intake air 111 taken out from the turbine 9b passes through the intake passage 11 and is supplied to the internal combustion engine 5.

Lubrication II 4ia of the conventional turbocharger described above is as follows:
As shown in FIG. 2, lubricating oil passages 23a and 23b from the cylinder block 2'1 are connected to the main supercharger 1a and the sub-supercharger IN l.
The rotary sliding portions 25a and 25b of b are connected to each other. Lubricating oil discharge passages 27a and 271+ are connected to the A oil pan 29 from this rotating sliding portion 251.25b.
is connected to. Since the compressor 9a, 9b side of the rotating sliding portions 25a, 25b is under general negative pressure, a mecaninonor seal is used to prevent lubricating oil from being sucked into the compressor 9a, 9b side.
Mechanino J Lucille is not used on the 3b side due to positive pressure.

In such a conventional turbo supercharging device for an internal combustion engine, in the low speed rotation range of the internal combustion engine, exhaust gas from the internal combustion engine 5 passes through the exhaust passage 7 (: 1).
Avoid rotating a. When the turbine 3a rotates, the compressor 9a rotates φλ through the turbine shaft 13a, and supplies intake air from a J clearer (not shown) to the internal combustion engine 55 through the intake passage 11'. This time, complete tree 9a
The supercharging pressure Pa is the exhaust gas from the exhaust gas passage 7 when the gate valve 15 is incremented by 1.
1. The culms are not ready to be fed to the glue bin 3b of the sieve machine 1b. C1 auxiliary supercharging m1b does not operate.

1 [In the medium speed rotation range of an internal combustion engine:) Supercharging!
As the rotational speed of compressor 1a increases, the supercharging pressure of compressor a increases. Therefore, the exhaust pipe 1-15 is gradually opened, and the exhaust passage The 1-no-1 gas from 7 is sent to the turbine 31 of the sub-supercharging IN 111)
, and the rotation of this turbine 3b is avoided.

As the turbine 3b rotates, the turbine shirt l
-1311, the compressor 9b also rotates, and the intake air from one air cleaner (not shown) is supplied to the intake passage 11 side by the compressor 9b. However, the supercharging pressure p l+ of the sub-supercharging 11 l b at this time is not large enough to open one intake merging control valve to the intake passage 11 . Therefore, since the intake passage 11 is blocked by one intake merging control valve, the intake air supplied from the compressor 9b is not supplied to the internal combustion engine 5, but is passed through the air relief valve 17 to the outside of C. 1 is issued. That is, in the medium-speed rotation range, both the main supercharger and the sub-superchargers B11a and 1b operate, but the main supercharger (intake air is supplied to the C internal combustion engine 5 only by the The rotational speed t at 111 is initially low, and gradually increases after t.

In the high-speed rotation range of the internal combustion engine, the supercharging pressure pa of the main supercharging (1a) becomes even higher, the 131 way 1-gate valve 15 is fully opened, and the intake relief valve 17 is closed.

By fully opening the exhaust way 1 to goo 1 to valve 15, the rotational speed of the subsupercharger 1b decreases by one. Therefore, the supercharging pressure 1 of the sub-supercharging 11) is released from the blockage appearing in the intake passage 11 of the intake merging control valve 19.

Therefore, the intake air supplied from the compressor 91) is combined with the intake air supplied from the combustion engine 4'9a, and is supplied to the internal combustion engine 5.

However, such a turbo supercharging device for an internal combustion engine cannot be used in any of the above-mentioned low-speed rotation range, medium-speed rotation range, and high-speed rotation range of the internal combustion engine.
IVI Naiyu is the main player, 18 losses and 11 losses, i1 and 11.
It is made of sugi-zukuri which is supplied to the moving parts. For this reason, when the inner engine is in the low speed rotation range, the sub-supercharging (
When the internal combustion engine is in the medium-speed rotation range, the rotation speed of the sub-supercharger is low. The amount of oil applied to the rotating and sliding parts of the auxiliary supercharger will be as high as the amount of oil F1. However, since the C1 intake side, that is, the compressor side, is under negative pressure, a mechanical seal is used, so no oil leakage occurs. However, a mechanical seal is not used on the IJI gas side, that is, the turbine side. Therefore, there was a problem that oil leaked from the exhaust gas side.

In addition, when internal combustion (shallow concave low J * rotation range d3 and the main turbocharger turbine shirt 1~ etc. are in a low speed rotation state, the oil pressure applied to the rotating sliding parts is relatively low, so No oil leakage occurs on the exhaust gas side.

"Purpose of the Invention" This invention was devised in view of the above-mentioned conventional problems.
I Reduce the supply of lubricating oil to the turbocharger C, Prevent lubricating oil from leaking to the gas side The purpose is to serve the public.

[Structure of the Invention] In order to achieve this object, the present invention provides a method for supplying lubricating oil to the auxiliary turbocharger among the lubricating oil passages that supply lubricating oil to the main turbocharger and the auxiliary turbocharger of an internal combustion engine. An oil control valve was installed in the passageway.

"Embodiment" Hereinafter, an embodiment of the present invention will be described in detail based on FIG. In addition, the main turbocharger and sub-supercharger 1 are 411fl-! 1, 4, and S are the same as the conventional example shown in FIG. i version.

Rotation 1″ A1 moving part 25 of main turbocharger 1a and sub-supercharger 11)
]a and 2511, lubricating oil passages 23a and 23b are respectively connected to the east). (Eye q wide print J81s2
From Ell, 25b are lubricating oil discharge passages 27a, 27.
The lubricating oil passages 2j and 2b of the auxiliary supercharger 11) are connected to the oil pans 29 and 29, respectively, and the solenoid valve I is connected to the lubricating oil passage 2j of the auxiliary supercharger 11). 3-1 is provided. A cylindrical body 35 having a small hole 33 bored in the side wall is attached to the upstream side 1111 of this oil system U11 valve 31.

In addition, oil control till valve 31 (7) operation 1
．． L-lnt+:+-/l/J-)- This was carried out by J, LON, Ofl on the Iotsu, which was transferred from Kit 37, and this operation caused the valve body 39 to move in the left and right direction. [, the -1 part 41 of the cylinder body 35 is opened and closed. That is, the valve body 39 is supplied to the rotating sliding part 25b only when the cylinder body 35 is opened; Part 4
1 is opened (ON), lubricating oil passes through the oil amount control valve 31 through the opening 41. In addition, information such as the intake air amount, rotation speed, supercharging (rotation speed, etc.) of the internal combustion engine is sequentially input to the control controller 37, and from this information ON/OFF signals are sent to the oil QI!I t311 valve 31. Wol
j 'J-le.

Next, the operation of the turbocharger for an internal combustion engine having the above configuration will be explained. The operation of the main supercharger 1a and the auxiliary supercharger 1() of the internal combustion engine turbocharging system in this explanation is approximately the same as the supercharging pressure shown in Fig. 1 in conventional example C, so the explanation will be simplified. Transform.

In the low speed rotation range of the internal combustion engine, exhaust gas is sent to the turbine 3a through the exhaust passage 7, so that the turbine 3a continues to rotate. When the turbine 3a rotates, the turbine shaft II
The main supercharger 1a is activated by the rotation of the -C compressor 9a via the main supercharger 3a.

At this time, the sub-supercharger 111 is not operating. J, that is,
Turbine 3b, turbine shaft I 13b, and turbine 9b are not rotating properly.

In this low speed rotation range, the oil amount control valve 31 is in the OFF state'? by the signal issued from the control unit l-37. If it is I, the valve body 39 is in a state of closing the cylindrical body 350 part 41. When the opening 41 of the valve body 39/)-cylindrical body 3 Ei is closed 111 times, the lubricating oil fed from the cylinder tough Ultsu 21 side is slightly fβ.
It passes through the small hole 33 and the lubricating oil passage 231) and reaches the rotating sliding part 251). Since the lubricating oil that has reached the rotating sliding part 2 Ei b flows through the small hole 33, the rotating sliding part 25
1) Do not raise the oil pressure higher than necessary. Therefore, there is no chance of oil leaking to the turbine 311 side where no mechanical seal is used.

Also, when the 1U supercharger 1a rotates at low speed, the internal combustion (shallow concave 'f) 11 (turn 411) is in the high rotation range. , no oil leakage occurs on the turbine 3a side.

In this way, the proper oil pressure was applied.
When it reaches the rotating sliding part 25b, it passes through the lubricating oil discharge passage 27b and flows out into the oil pan 29. On the other hand, the main supercharging 48
The aD lubricating oil is also fed to the rotating sliding portion 25a of the cylinder block 21 through the lubricating oil passage 23a. After this lubricating oil lubricates the rotating parts such as the turbine shafts 1 to 13a of the rotating sliding part 25a, it flows out into the oil pan 29 through the lubricating oil JJI outlet passage 27a.

In addition, in the medium speed rotation range C of the internal combustion engine, the number of rotations of the turbine 3a increases compared to the above-mentioned low speed rotation range, and the side light and
JJI air gas is sent to the turbine 3b of the feeder 1b through the IJI air passage 7, and the C turbine 31) rotates. As the turbine 3b rotates Φλ, the compressor 9b rotates via the turbine shift V-shift 13b, thereby increasing the auxiliary supercharger 1b.
covers the operation. In this medium speed rotation range C-, the amount of exhaust gas sent to the turbine 3b is small at first, and then gradually increases, so that the rotation speed of the C turbine 3b initially increases.
low, then gradually increases to C.

At the beginning of this medium speed rotation range, the above-mentioned low speed rotation\lt b5
In response to the signal issued from the control units 1 to 37 in substantially the same manner as in ゜, the oil flow control valve 31 becomes OFF, and the valve body 39 closes the 1-1 section 41 between A35 and 35. In this medium-speed rotation range, the number of rotations of the internal combustion engine is gradually increased to 11] (+ the rotation speed of the turbine 3a of the supercharger 1a is also increased to 10), and the rotation speed of the auxiliary supercharger 1b is increased. Turbine 31) times II
I/l forgiveness is over. In this way, the internal combustion engine I3! JJj
J, and when the rotation speed of the supercharging device is above '7i']n1~1
]1-ru''--by the signals emitted from 1 to 37,
Song (f”H control boolean r 31 is in ON state and valve body 3
9 is in a state where the 1-1 portion 41 of the cylindrical body 35 is opened.

When this J valve 39 opens the frontage/11 of the simple tree 35, the lubricant C1 sent from the cylinder tab II side 21 is transferred to the frontage/11 of the fti body 35. 1 all ji' 31, further passes through the lubricating oil passage 231), crosses the -4 rotary sliding part 2511, and rotates the sliding part 251) of the turbine 1a side 1 to 131) etc.
↑j seems to be due to the Δ71 sliding action. In this case, the oil pressure applied to the rotating sliding part 2 (51) (the oil pressure J applied to the rotating moving part 51 at the beginning of the low-speed rotation range and mid-rotation range) is also high. However, the turbine shift is
Since the turbine 1a rotates at a higher speed than ~13b etc.
Oil leakage does not occur on the turbine 31) side because the oil draining action at the seal portion on the side l-13II works. On the other hand, the rotating sliding portion 25b of the main supercharger 1a also has a rotating sliding portion 25b.
The hydraulic pressure is approximately the same as that applied to the turbocharger 1b, but since the turbine 3a rotates at a high rotation rate, no oil leakage occurs on the turbine 1a side, similar to the subsupercharger 1b.

In addition, in the high-speed rotation range C of the internal combustion engine, the rotation speed of the turbine 3a is further increased compared to the above-mentioned medium speed rotation range, and the rotation speed of the turbine 3b of the sub-supercharger 11) is further increased. I
, : High speed rotation from the middle of the medium speed rotation range The summer saw turbine 31) continues to rotate at high speed.

In this high speed rotation range, the above-mentioned medium speed rotation I! ! I'C'
In substantially the same way as when the turbine 3b rotates at a high speed, the turret control valve 31 is turned on due to the signal issued from the control unit 1-37, that is, the valve body 39 is closed to the opening 41 of the n1 hole 35. Listen to 1i9. L/ta state yells.

Therefore, the lubricating oil also acts in substantially the same manner as when the turbine 3b rotates at a high speed in the above-mentioned medium-speed rotation Φlj region (-) and spills out, so no oil sludge occurs on the turbine 3b side.

FIG. 4 shows another embodiment of the present invention.
The same parts as those in the figure are given the same reference numerals to simplify the explanation.
Ru. Rotation 1- of sub-supercharger 11)? A lubricating oil passage 231) that communicates with the moving part 251) is provided with a 1llm fli control valve 43.A valve body 45 is connected to the lubricating oil passage in the valve 14t7ei of this oil amount control valve 43. 23-1+
Even when the cylinder is shut off, the minimum amount of oil required is
- Rotating sliding part 25 of sub-supercharger 4511b from the side of 1st gear 21
1) A small hole 47 is drilled into the sea urchin. The valves (4, '15 are biased by a spring 46 in the air passage 7, which communicates with the turbine 31+ of the auxiliary supercharger 11). , IJI waste flow control valve/15) is installed. This air gas separation control valve 19 controls a diaphragm 53 and a spring 55, which respond to the supercharging pressure 1)B of the compressor 9a of the main supercharger 1a, through a passage 51. A phosphor mechanism 57 is connected to the diaphragm 53, and the oil amount control valve 43 is connected to one end of the link mechanism 57, and a valve body 59 is attached to the other end. That is, as the rotational speed of the compressor 9a of the high-speed rotating acid etc. C main passage frame 1a increases, the supercharging pressure pa increases, and this increase in supercharging pressure pa causes the diaphragm of the exhaust gas separation control valve 49 to increase. 53 moves -C against the spring 55. Due to the movement of the diaphragm 53,
Via the link 57, the valve A45 of the oil amount control valve 43 moves against the spring 46 to open the lubricating oil passage 23b. As the valve body 45 moves, the body 59 also opens the air passage 7 via the link 57.

As described above, 1) The first air passage 7 is opened, and the exhaust gas flows out to the sub-supercharger UNlb, and the turbine 3b, the turbine shaft 11, the shaft 13b, and the compressor 9b rotate at high speed. By opening the lubricating oil passage 23b, the turbine shaft rotating at high speed 1-
An appropriate amount of oil m can flow to the rotating sliding portion 2511 such as 13b.

In addition, in a low speed rotation range, etc., the supercharging pressure pa by the compressor 9a is low, so the diaphragm 53 cannot be avoided.1. The shift C1 oil fl control valve 43 is the lubricating oil passage 23b.
The C1 lubrication i+b of the block is 51 bodies 7I5 small hole 47
is supplied to the rotating sliding part 25) It only through the
The air gas distribution control valve/I-9 51 body F) 5] blocks the exhaust passage 7 and prevents the air gas from flowing out to the turbine 1311.

[Effect of the invention] As described above, if J is included in this defense, then fi +'3. Of the lubricating oil passages that supply lubricating oil to the main turbocharger and sub-supercharger, an oil flow control valve is installed in the lubricating oil passage of the 6Y1 turbocharger.
Due to this, internal combustion engine 1 is in operation, and the auxiliary supercharger is +”:ll
During medium or low speed rotation, it is important to avoid reducing the lubricating oil supply to the auxiliary turbocharger side, and to avoid reducing the oil pressure applied to the auxiliary turbocharger side. Is it true that the turbine side covers the rotating and sliding parts using mechanical seals? l'', 'i: In other words, lubricating oil can be prevented from leaking to the exhaust gas side.

In addition, in the embodiment shown in the previous example, by providing a small hole n' in the oil flow control valve, the C, 01 supercharger can be stopped 1-ri bL/
(1) Although lubricating oil is supplied to the rotating and sliding part of the sub-supercharger even during high-speed rotation, it is not necessary to drill this small hole. , when the small hole is not drilled in the oil flow control valve, the sub-supercharger changes from low speed rotation to 1% speed rotation,
When moving from high-speed rotation to low-speed rotation, the oil amount control valve is gradually opened.

Note that this invention is limited to the embodiments described in 1) fj.
)'c is not present.

[Brief explanation of the drawing]

Negative] Figure 1 (Figure 11 shows the vertical system of the conventional turbocharger; Figure 2 shows the d"1°1d of the conventional turbocharger.
'1 Oil distribution ↑j diagram and Figure 3 show the turbocharger f of this invention.
Figure 4 is a color scheme of 1Run d'I oil showing another example of this invention.

Claims (1)

[Claims] In an internal combustion engine turbocharging device having a main supercharger and a sub-supercharging port, and a lubricating oil passage for supplying lubricating oil to the main supercharger and the sub-supercharger, the sub-supercharging A turbo supercharging device for an internal combustion engine, characterized in that an oil flow control valve is provided in the lubricating oil passage of the engine.