JPS62233421A - Lubrication device for turbocharger - Google Patents

Abstract

PURPOSE:To secure an oil supply to a turbine bearing after an engine stops and to prevent its seizure, by disposing a valve mechanism in an oil transportation passage from the engine to the bearing and opening the valve mechanism when the pressure of transported oil is less than a prescribed value. CONSTITUTION:A lubrication device 1 comprises a valve mechanism 3 disposed in an oil pipe 2 for introducing lubrication oil supplied from the oil pump in an engine under pressure to a turbocharger and an oil tank 4 communicating with the pipe 2 through the valve mechanism 3. The valve mechanism 3 has inlet and outlet passages 5, 6 and first and second check valves 7, 8 biased to a closing direction and an opening direction are disposed in the inlet and outlet passages, 5, 6, respectively. The oil tank 4 has a partition plate 17 for partitioning an oil chamber and the partition plate 17 is biased downwardly by a spring 18 at all times. When the engine stops and the hydraulic pressure in the pipe 2 is less than a prescribed value, the oil in the oil tank 4 is supplied to the turbocharger from the check valve 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a turbocharger that continues to rotate after the engine of an automobile is stopped! ! The present invention relates to a lubricating device for a turbocharger that can prevent seizure of the turbocharger and decrease in durability by subsequently supplying lubricating oil.

(Prior Art) A turbocharger exists as a supercharger that increases engine output by increasing the amount of intake air into a cylinder by increasing the boost pressure of the engine. A turbocharger utilizes the pressure generated when exhausting combustion gas generated by an explosion in a cylinder, and when this exhaust gas is blown onto a turbine impeller and rotated,
The amount of intake air is increased by rotating a centrifugal compressor coaxially integrated with a turbine impeller. That is, the air taken in from the air cleaner is compressed and accelerated by the rotation of the compressor's impeller, and its velocity is reduced while passing through the diffuser, and the velocity energy is converted to pressure, becoming compressed air and passing through the collector. and is sent to the engine's inleft manifold.

Since the exhaust gas temperature reaches high temperatures exceeding 700°C during high-load, high-speed rotation, the turbine impeller is made of high-grade stainless steel with high heat resistance, which improves responsiveness during startup and enables high-speed rotation. Therefore, it is smaller and lighter. Also, high speed rotation (EIo, 000 to 100.
In order to create a structure that can withstand 000 rpm), a full floating bearing is used on the shaft that integrates the turbine impeller and the compressor impeller, and engine oil is supplied to the full floating bearing.

(Problem to be Solved by the Invention) However, in the conventional turbocharger lubrication device, even after the supply of lubricating oil from the engine is stopped by stopping the engine, the shaft of the turbine Because the turbine continues to rotate for a predetermined period of time due to the inertia of There were many. In order to solve this kind of problem, it is necessary to wait at least 1 to 3 times after stopping the car.
In the 11++, it was necessary to continue supplying lubricating oil to the shaft of the turbocharger by idling, but such work was troublesome for the driver and could reduce the practicality of the turbo device.

(Means for Solving the Problems) The present invention has been made in view of the above, and is intended to ensure the supply of lubricating oil to the shaft of the turbocharger even after the engine is stopped. In a lubrication mechanism configured to supply oil to a bearing part of a turbine of a turbocharger, a pulp mechanism disposed in an oil transport path from the inside of the engine to the bearing part of the turbine, and a pulp mechanism arranged in the oil transport path from the inside of the engine to the bearing part of the turbine, and a pulp mechanism arranged in the oil transport path from the inside of the engine to the bearing part of the turbine and an oil tank configured to be able to be opened and closed in communication with the conveyance path.The valve mechanism closes when the oil pressure in the conveyance path exceeds a predetermined value and closes the gap between the oil tank and the conveyance path. The present invention provides a lubricating device for a turbocharger configured to close the oil tank and open the oil tank and the conveyance path when the oil becomes lower than the predetermined value.

(Example) Hereinafter, the turbocharger lubrication device of the present invention will be described in detail.

FIGS. 1 and 2 show a configuration explanatory diagram and a layout diagram 21 of main parts of an embodiment of the present invention, and this lubricating device 1 supplies lubricating oil under pressure from an oil pump in an engine to a turbocharger. It is generally composed of a pulp mechanism 3 disposed in a supply oil pipe body (conveyance path) 2 and an oil tank 4 disposed so as to be able to communicate with the pipe body 2 via a valve mechanism 3.

The valve mechanism 3 has an inlet 5 and an outlet 6, and the inlet 5 has a first check valve 7 that is always biased in the closing direction.
A second check valve 8, which is always biased in the open direction, is disposed in each of the outlet passages 6.

The first check valve 7 is made up of a valve body 9 and a spring 10 that biases the valve body 9 in the closing direction. 5 is occluded. The position of the valve body 9 varies depending on the balance between the spring 10 and the hydraulic pressure from the inlet 5. That is, when the engine is driving and the oil pressure in the pipe body 2 is sufficiently high, the spring 10 is compressed to separate the valve body 9 and the valve seat 5a and open the inlet passage 5, while the engine When the oil pressure in the pipe body 2 decreases due to the stoppage of the valve body 2, the valve body 9 is pressed against the valve seat to close the inlet passage 5.

The second check valve 8 is made up of a valve body 11 and a spring 12 that always biases the valve body 11 in the open direction. A communication hole 13 is formed to allow the connection.

The position of the valve body 11 varies depending on the balance between the pressing force of the spring 12 and the hydraulic pressure from the communication hole 13. That is, when the oil pressure in the pipe body 2 is sufficiently high, the spring 12 is compressed through the communication hole 13 and closes the outlet passage 6, but when the oil pressure decreases, it expands and closes the outlet passage 6. Open.

The oil tank 4 includes a tank body 15 that is screwed onto the pulp mechanism 3 at one end in the axial direction, a lid body 16 that is screwed on the other end of the tank body 15, and a lid body 16 that is in close contact with the inner wall of the tank body 15 in the axial direction. A partition plate 17 that is slidably disposed, a spring 8 that is stretched between the lid body 16 and the partition plate 17 and always biases the partition plate 17 toward the valve, and a spring element 8 that is formed on the lid body 16. a manifold negative pressure tube 20 that is installed in the hole 16a and introduces negative pressure from inside the engine into the negative pressure chamber 19 between the lid 16 and the partition plate 17; the tank body 15 and the lid 1;
6 cooling fins formed in the shape of an outer surface. The bottom of the tank body, i.e. the top surface of the valve mechanism, may be flat as shown, or may be a tapered surface that slopes downward toward each check valve 7.8, outside the partition plate 17. An elastic packing 22 may be attached to the periphery to slidably and watertightly engage the inner wall of the tank body 15. Reference numeral 23 is a bellows cylinder made of an elastic body that can be expanded and contracted in the vertical direction to prevent oil leakage. This is to prevent

52 shows an example of the installation location of the lubricating device l shown in FIG. 1, where 25 is the engine body, 26 is the transmission, 27 is the radiator, 28 is the intake manifold, 29 is the exhaust manifold, 30 is a turbo turbine, 31 is a turbo compressor, 32 is an air cleaner, and 33 is an inlet air duct. The tube body 2 shown by the zero dotted line is a conventional lubricating oil supply tube body.

The tube body 2 shown by the solid line is a tube body having the lubricating bag 'al' of the present invention. It is preferable that the lubricating bag Jj11 be fixed to the inner wall of the engine compartment.

In the above configuration, when the engine is running, the amount of oil IIt and the oil pressure in the tube body 2 are maintained sufficiently high (0.8 to 4.5 kg/■2), while the negative pressure room 19
Since negative pressure from the engine is introduced into the tank, the first check valve 7 is repeatedly opened and closed to ensure a sufficient amount of oil in the tank body, as shown in Figure 1. I go to J. In other words, the partition plate 17 is pushed upward against the spring 18 by the suction force of the negative pressure, while the valve body 9 is pushed up in the opening direction by the hydraulic pressure of the tube body 2. Lubricating oil is supplied from the body 2. At this time, the second check valve 8 is pressed toward the left side in the drawing and closes the outlet passage 6.

Next, when the engine stops driving, the pipe body 2
When the pressure in the negative pressure chamber 19 rises to approximately atmospheric pressure at the same time as the flow rate and oil pressure in the chamber decrease.

While the first check valve 7 is closed, the valve body 11 of the second check valve 8 is displaced in the opening direction (to the right in the drawing) to open the outlet passage 6. For this reason.

The oil in the tank body flows into the pipe body 2, and as long as the turbine of the turbocharger continues to rotate, a sufficient amount of oil is supplied to the bearing portion of the turbocharger.

Note that even if some of the oil leaks into the negative pressure chamber 19 from between the partition plate 17 and the inner wall of the tank body 15, there is no problem at all because it is simply returned into the engine via the pipe body 20.

Next, FIG. 3 shows a second embodiment of the present invention.

This shows a type of configuration with a built-in lubrication device inside the engine. In this drawing, the lubrication path within the engine 25 is mainly shown, and the cylinder.

Pistons etc. are not shown, i.e. oil pan 35
The oil inside is sucked up by an oil pump 36 and supplied to each part through oil gear rallies 37 and 38 formed inside the engine. The head gasket 39 partitions the cylinder block part and the cylinder head part, and the oil reservoir (oil tank) 40 above the thin ring head is always in communication with the turbocharger 41 via the oil gear rally 38, while the check valve 42 (valve mechanism ) so that it can also be used for communication. The check valve 42 is
A sub-flow path 43b connecting the oil reservoir 40 and the main flow path 43a is configured to be openable and closable, and includes a valve body 44 and a spring 45 that always moves the valve body 44 in the opening direction. Serves the sub flow path 43b and the oil gear rally 38! / The partition wall 46 has a sub-flow path 4
A communication hole 47 is formed to allow communication between the oil gear 3b and the oil gear gallery 38. The check valve 42 is configured to be located above the turbocharger 41. The bottom of the oil reservoir has a tapered surface that slopes downward toward the sub-flow path 43b.

In the above configuration, while the engine is driving, the flow rate and oil pressure in the oil gear gallery 38 are sufficiently high, so the main flow path 43a passes through the pipe body 2 to the turbocharger 41.
Oil is supplied for 1 minute. At this time, the valve body 44 is pressed in the closing direction by the pressure from the communication hole 47 and closes the sub-flow path 43b.

Next, if the engine stops, oil gear
8 to the main flow path 43a is stopped, while the pressure from the communication hole 47 is released, the spring 45 expands and opens the sub flow path 43b.
The yuzu inside can be supplied to the turbocharger 41 via the sub-flow path 43b.

Therefore, as long as the turbine of the turbocharger continues to rotate even after the engine is stopped, sufficient oil can continue to be supplied to the bearing.

FIG. 4 shows a turbine speed reduction device that can significantly improve the durability of the bearing section when used separately or in combination with the lubricating device of the present invention. An electromagnet 50 is disposed between a turbine impeller 30 and a compressor turbine impeller 31 in a non-contact manner. Reference numeral 51 denotes a control unit with a timer function, which is configured to apply voltage from the battery to the electromagnet 50 for a predetermined period of time after the engine is stopped.

In the above configuration, when a voltage is applied to the electromagnet 50 by the operation of the control unit 51 after the engine is stopped, the electromagnet forms a magnetic field. When this magnetic field is cut by the rotating turbine impeller, each impeller 30.
An eddy current is generated at 31, and when this eddy current interacts with the magnetic lines of force again, a force is generated in each impeller in a direction that prevents its rotation, thereby braking the rotation of the impeller and stopping the rotation of a. By stopping the rotation of the turbine early in this manner, the durability of the bearing can be improved. However, sudden braking may cause various inconveniences, so it is necessary to do it gradually.For this purpose, a timer is used; the brake is configured to be applied with an appropriate force during a set period of time. . The supply of lubricating oil during this time period is performed by the lubricating device shown in each of the above embodiments.

(Effects of the Invention) As described above, according to the turbocharger lubrication device of the present invention, the supply of lubricating oil to the shaft portion of the turbocharger can be ensured even after the two engines are stopped.

Therefore, seizing of the bearing portion and reduction in durability can be prevented.

[Brief explanation of drawings]

1 and 2 are a sectional view and a layout diagram of main parts showing the configuration of an embodiment of the present invention, and FIG. 3 is a diagram illustrating the configuration of a second embodiment of the present invention. Symbol ■... Lubricating device 2... Conveyance route (pipe body) 3...
Fist valve mechanism 4...Shoyu tank 5ψ...Inlet 6...
・Exit 7.8・Φ Check Pulp 9.11・Mockery
Valve body io, 12... Spring 13... Communication hole 1
4... Partition wall 15 - Tank body 16 - Lid 16a... Hole 17 φ Partition plate 18 - Spring 19 - Negative pressure chamber 20... Negative pressure tube
21--・Cooling fin 25φ-・Engine body 2
6... e-transmission 27... radiator
28--Intake manifold 29... Exhaust manifold 30... Turbo turbine 31
11...Turbo compressor 32◆Bottle/Air cleaner 33-Kist φ inlay, Toe air duct 35-116 Oil pan 36-...Oil pump 37.38...Oil gear rally 39...Head gasket 40...Oil reservoir ( Oil tank) 41... Turbocharger 42--Check pulp 42 (pulp mechanism) 43a, 43b... Channel 44... Valve body 45... Spring No. 46... Partition wall
47...Communication hole 50...φ1a stone 51・l111 Control unit Fig. 1 To turbo Fig. 2 ``-wa 711j Correct ゛,-ri 1984
July 9th, 2016, Director General of the Japan Patent Office, Michibe Uga, I.J Relationship Patent Applicant Name Katana'k f+'7 美４
Agent address (164) Tokyo Nakano IK Nakano 3-34-3 Jukenko, f203 53 June 1985 2411 6 Sleeve II: Column for a brief explanation of the drawing in subject specification 1. , .--1-.l' 8) 7. Contents of the amendment (1) The statement ``Construction explanatory diagram of embodiment 2, J'' on page 13, line 14 of the specification is corrected as follows.

Claims (1)

[Scope of Claims] In a lubrication mechanism configured to supply oil in an engine to a bearing of a turbine of a turbocharger, a valve mechanism disposed in an oil conveyance path from the inside of the engine to the bearing of a turbine. and an oil tank configured to be able to open and close communication with the conveyance path by the valve mechanism, and the pulp mechanism closes and drains the oil when the oil pressure in the conveyance path exceeds a predetermined value. A lubricating device for a turbocharger, characterized in that the oil tank and the conveyance path are closed, and when the oil falls below the predetermined value, the oil tank and the conveyance path are opened to establish communication between the oil tank and the conveyance path.