JPS5836826Y2 - Turbo-charge priority lubrication system for turbo-charge engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turbocharger priority lubrication system for supplying sufficient lubricating oil to the turbocharger after engine startup in a turbocharged engine.

The lubricating system of conventional turbocharged engines is generally the first
It has the structure shown in the figure.

In FIG. 1, a discharge port 2 of a lubricating oil pump 1 driven by an engine is connected to an inlet 6 of a filter 5 through a (first) passage 4 having a pressure regulating valve 3 in the middle.

The outlet 1 of the filter 5 is connected to a lubricating part 9 through a (third) passage 8, and the outlet 10 of the lubricating part 9 is connected to a pump inlet side device 12 through a return passage 11.

The filter outlet lower is connected to the turbocharger 14 via a further passage 13, and the outlet 15 of the turbocharger 14 is connected to the traffic jam 12 via a return passage 16.

The outlet 17 of the traffic jam 12 connects the passage 18 to the inlet 19 of the pump 1.

However, the turbocharger 14 rotates at high speed immediately after the engine starts, reaching a maximum of 80,000 rpm, whereas the lubricating oil pressurized by the pump 1 is supplied to the turbocharger 14 after passing through the filter 5, so the lubricating oil is There was a problem in that the supply was insufficient, causing seizure.

This invention solves the above problems by supplying lubricating oil pressurized by a pump directly to the turbocharger without passing through the filter during the initial rotation period immediately after engine startup, and also provides lubricating oil that does not pass through the filter. The purpose is to provide a turbocharger priority lubrication system that does not cause reverse flow of lubricating parts and deteriorate the durability of other lubricating parts of an internal combustion engine. An example of the circuit is shown in FIG.

In FIG. 2, the same reference numerals as those in FIG. 1 indicate corresponding parts.

The pump outlet 2 is connected through a second passage 21 to a first volume 23 of the rapid delivery device 22, and the filter outlet lower is connected through a fourth passage 24 to a second volume 25 of the device 22.

The outlet 26 of the device 22 is connected to the turbocharger 14 via a passage 27.

The rapid feeding device 22 has its first population 23 and second population 2.
When the pressure difference of 5 or less decreases below a certain level, the outlet 26 is
A valve for switching from the communication state with the population 23 to the communication state with the second population 25 is built in, and the detailed structure is shown in FIG.

The main body 22' of the rapid feeding device 22 shown in FIG. 3 includes a large diameter cylinder 30 and a small diameter cylinder 31 concentrically. The small diameter portions 32b of the valve body 32 are fitted into each other, and the annular gap 33 formed between the valve body 32 and both cylinders 30, 31 is connected to the cylinder of the engine via the joint bolt 34 and the pipe 35, as shown in FIG. Block (not shown)
The valve body 32 can therefore slide freely within both cylinders 30, 31 without back pressure.

A coil spring 37 is compressed between the plug 36 that closes the lower end of the small-diameter cylinder 31 and the valve body 32 to give upward elasticity to the valve body 32, and this elasticity causes the valve body 32 to close the large-diameter cylinder 30. It is normally pressed into contact with the lower end of the joint bolt 38 screwed into the upper end.

At that time, the first inlet (
boat) 23 is open, and the bottom of the chamber 39 is a passage 40.41.
．． It is connected to the passage 27 through the joint bolt 42.

43.44 is a plug. The second population 25 above the large diameter portion 32a of the valve body has a small diameter passage 4 having a ball 9f45.
6. Connect to the passage 41 through the large diameter passage 47.

The ball valve 45 is seated on the valve seat 49 by the elasticity of the coil spring 48, and functions as a check valve that only allows oil to flow from the passage 46 to the passage 47.

At the beginning of rotation, the oil pressure supplied from the fourth passage 24 through the filter is O or extremely low, so the valve body 32 maintains the position shown in Fig. 3 due to the elasticity of the coil spring 37, and is therefore pressurized by the pump. The lubricating oil flows through the second passage 21 as shown by the solid arrow.
From there, go through the first population 23 and enter the room 39, and then go to the passage 40,
41, a joint bolt 42, and a passage 27 to be directly supplied to the turbocharger.

That is, the lubricating oil supplied directly from the pump reaches the turbocharger as soon as the engine starts rotating.

Next, the lubricating oil that has left the normal route of pump 1 (Fig. 2) - pressure regulating valve 3 - filter 5 is transferred from the fourth passage 24 to the second passage.
When supplied to the population 25, since the effective area A of the large diameter portion 32a of the valve body 32 is larger than the effective area B of the small diameter portion 32b (
A>B), -U lower end surface of weight diameter portion 32b (effective area B)
Surface pressure (hydraulic pressure and @ of area B) acting on coil spring 37
The surface pressure (and the sum of the weight of the valve body 32) acting on the upper end surface (effective area A) of the valve body large diameter portion 32a overcomes the total value of elasticity, and the valve body 32 moves downward. The small diameter portion 32b of the valve body closes the first inlet 23, and the circuit indicated by the solid arrow is cut.

On the other hand, as the oil pressure of the second valve 25 increases, the ball valve 45 separates from the valve seat 49, and the second valve 25 moves away from the valve seat 49, as shown by the broken line arrow.
The lubricating oil inside the passages 46, 4γ, 41, the joint bolt 42,
It is switched so that it is supplied to the tar restrainer via the passage 27.

As explained above, according to the present invention, the discharge port 2 of the lubricating oil pump 1 passes through the first passage 4 to the inlet 6 of the filter 50, and also passes through the second passage 21 to the first inlet 2 of the rapid delivery device 22.
3, the outlet 1 of the filter 5 is connected to the lubrication section 9 through the third passage 8 and to the rapid delivery device 22 through the fourth passage 24.
, and connects the turbocharger outlet 26 of the rapid delivery device 22 to the turbocharger 14 , and the first inlet 23 in the rapid delivery device 22 .
The first delivery passages 40, 41 pass through the turbocharger outlet 26, and the second delivery passages 40, 41 pass through the turbocharger outlet 26.
A cylinder 30.31 is interposed between the first population 23 and the second population 25, and a first discharge passage 46, 4γ is formed to communicate the population 25.
A valve body 3 that switches the turbocharger outlet 26 from a state of communication with the first population 23 to a state of communication with the second population 25 when the pressure difference between the population 23 and the second population 25 decreases below a certain value.
2 is slidably fitted into the second delivery passages 46, 4γ, and serves to prevent lubricating oil from flowing backward from the first delivery passage 40° 41 to the second port 25, and also serves as a pressure regulating valve.
5 built-in, you can expect the following effects.

(a) At the initial stage of engine rotation immediately after engine startup, the lubricating oil directly supplied from pump 1 immediately reaches turbocharger 14, and then as the engine starts to rotate, the lubricating oil pressure in the normal route that has passed through filter 5 rapidly increases. When it reaches the delivery device 22, the tank 45 is switched and the oil that has passed through the filter 5 is used to lubricate the turbocharger 14. This makes it possible to reliably prevent lubricant shortages and seizure accidents caused by this.

(b) Since the built-in check valve 45 works to prevent the lubricating oil from flowing backward from the first inlet 23 to the second inlet 25 and also serves as a pressure regulating valve, the lubricating oil from the first inlet 23 is not filtered. The fear that it will flow back into the second population 25 will be completely eliminated.

Therefore, particles such as wear particles are not sent together with the lubricating oil from the rapid delivery device 22 to other lubricating parts 9 of the internal combustion engine through the fourth passage 24, thereby preventing deterioration of the durability of the internal combustion engine. .

Furthermore, since the check valve 45 also serves as a pressure regulating valve for controlling the flow of filtered lubricating oil, the structure is simple and there is an advantage that it can be manufactured at low cost.

When embodying the present invention, the rapid feeding device 22 may be used in an attitude such as that shown in FIG.

[Brief explanation of the drawing]

Fig. 1 is a conventional circuit diagram, Fig. 2 is a circuit diagram of the device according to the present invention, Fig. 3 is a longitudinal cross-sectional view of the rapid feeding device in Fig. 2, and Fig. 4 is a cross section taken along the line IV-IV in Fig. 3. FIG. 1... Lubricating oil pump, 2... Discharge port, 4... First
Passage, 5... Filter, 6... Inlet, γ... Outlet, 8... Third passage, 9... Lubrication section, 14... Turbocharger, 21... Second passage, 22... Rapid delivery device, 23... First population, 24... Fourth passage, 25... Second population, 26... Turbocharger outlet, 3031... Cylinder, 32...・Valve body, 40
41...First delivery passage, 45...Ball valve (an example of a check valve), 46.47...Second delivery passage.

Claims (1)

[Scope of utility model registration request] The discharge port 2 of the lubricating oil pump 1 is connected to the inlet 6 of the filter 50 through the first passage 4, and to the first inlet 23 of the rapid delivery device 22 through the second passage 21, and the lower outlet of the filter 5 is connected to the inlet 6 of the filter 50 through the first passage 4. The third passage 8 is connected to the lubricating part 9 and the fourth passage 24 is connected to the second port 25 of the rapid delivery device 22, and the turbocharger outlet 26 of the rapid delivery device 22 is connected to the turbocharger 14. In the rapid delivery device 22, there are first delivery passages 40, 41 that communicate the turbocharger outlet 26 with the first population 23, and a first delivery passage 4.
A second delivery passage 4 communicating with the second population 25 at 0.41
6,4γ, and further the first population 23 and the second population 25
A cylinder 30, 31 is interposed between the cylinder 30 and the cylinder 30.
．． 31, when the pressure difference between the first population 23 and the second population 25 decreases below a certain value, the turbocharger outlet 26 is
A valve body 32 for switching from a state of communication with the population 23 to a state of communication with the second population 25 is slidably fitted, and the second delivery passages 40 and 41 are inserted into the second delivery passages 46 and 47.
A turbocharger priority lubrication device for a turbocharged engine characterized by having a built-in check valve 45 which functions to prevent lubricating oil from flowing back and also serves as a pressure regulating valve.