JPS6113717Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubrication system for a turbocharger, and particularly to a device for preventing seizure of a bearing portion.

In gasoline engines and diesel engines,
Some are equipped with a turbocharger to increase fresh air intake efficiency (filling efficiency). This turbocharger uses a turbine driven by exhaust pressure to rotate a compressor to supercharge intake air and improve intake efficiency.

By the way, immediately after high-speed operation or high-load operation,
If the engine is stopped while the turbocharger turbine is still near high temperature and high rotation, the supply of lubricating oil from the oil pump driven by the engine will also stop at the same time, and the turbine will continue to rotate for a while due to inertia. There is a risk that the high-temperature bearing part that is integrated with the product may seize up. For this reason, after high-speed, high-load operation, the engine is controlled to idle for a predetermined period of time to reduce the rotation of the turbine and stop the engine after the temperature of the bearing has decreased. A number of ideas have been made to prevent seizure of the turbocharger bearing by providing an accessory part in the lubrication system that has the function of supplying oil to the turbocharger bearing even after the engine has stopped.

For example, some oil pumps are equipped with an oil pump dedicated to oil lubrication to the turbocharger, in addition to the conventional oil pump. In this case, when the engine is stopped, the oil pump dedicated to the turbocharger is driven for a predetermined period of time, and oil is supplied to the turbocharger during that period. An example of this is disclosed in Japanese Utility Model Application No. 55-146830.

Still another example is a system in which an oil reservoir is provided in the middle of the oil circuit of a turbocharger, and when the engine is stopped, oil is supplied from the oil reservoir to the turbocharger.
There is number 31316.

However, the method of JP-A-55-146830 requires a dedicated oil pump and oil circuit for supplying oil to the turbocharger, and in JP-A-48-31316, the oil circuit to the turbocharger is The equipment was complicated and expensive, as it required an oil sump to be provided.

The purpose of this invention is to automatically supply oil to the turbocharger for a predetermined period of time even after the engine has stopped, without installing any special equipment during oil circulation, as described above, so that the turbine can rotate by inertia. The present invention proposes a structure of an oil filter that can prevent seizure of the turbocharger bearing during the engine operation.

The structure of the present invention is that, in an oil filter for an engine with a turbocharger, a housing serving as an outer shell is attached to a filter base, a filter element is arranged within the housing concentrically with the housing with a gap around the periphery, and the filter element is arranged inside the filter element. The filter base is provided with an oil outlet communicating with the filter element and a plurality of oil inlets communicating with the gap between the filter element and the housing, and a partition wall is provided on the inner wall of the housing to separate the gaps. The upper end of the partition wall is a sealed end when viewed from the perspective of the oil filter being installed in the engine, and an oil communication port is opened at the bottom to form an air reservoir between the partition wall and the housing, and the air within the air reservoir is When the engine is operating, that is, when the oil pump is operating, it is compressed by the pressure of the oil passing through the oil filter and becomes a pressure accumulation state, and after the engine stops, that is, after the oil pump stops, the volume returns to the pressure accumulation side due to a decrease in oil pressure. .

According to this configuration, when the engine is stopped, the air in the air reservoir chamber expands in volume as described above, and oil is discharged from the oil filter and is used to lubricate the engine body and the turbocharger bearing. Furthermore, since the amount of volume change is proportional to the oil pressure, the oil pressure is higher during high-speed operation, and more oil can be stored. Therefore, the amount of oil discharged from the oil filter after the engine is stopped increases as the engine operates at high speeds, and decreases as the engine operates at low speeds. This means that after high-speed operation when the turbocharger is at a high temperature, more oil is discharged to automatically act for cooling, and conversely, less oil is supplied after low-speed operation when the turbocharger does not reach too high a temperature. In this way, the amount of oil discharged from the oil filter after the engine is stopped is automatically adjusted to the amount that matches the operating condition before the engine is stopped.

With this configuration, the necessary amount of oil can be supplied to the turbocharger bearing, which rotates by inertia after the engine has stopped, without installing a new oil supply device as an accessory, so even if the engine is stopped immediately after high-speed, high-load operation, the turbocharger bearing will not be affected. will not get burned out.

Further, in addition to the above-described configuration, the present invention includes a partition wall for providing an air reservoir inside the oil filter, so that the interior of the oil filter is reinforced. Furthermore, since heat escapes from the partition wall etc. to the housing, it also has an oil cooling effect.

Next, embodiments of the configuration of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an oil circuit equipped with an oil filter according to the present invention.

In the figure, oil 13 in an oil pan 1 is sucked up by an oil pump 2 and guided through a check valve 3 to an oil filter 4 having the above-mentioned pressure accumulating function. Oil 13 from oil filter 4
The oil passes through the passage 5 and is divided into an oil supply path 6 to the engine body and an oil supply path 7 to the turbocharger, and is cooled and lubricated by being led to the lubricating oil 8 of the engine body and the turbocharger 9, respectively, and is further provided with a return path from the engine body. 10 and the return path 11 from the turbocharger to the oil pan 1.
Go back inside.

Furthermore, by providing a switch valve 12 in the middle of the oil supply passage 6, which has the function of making the oil supply passage 6 conductive when the engine is running and shutting it off when the engine is stopped, the air reservoir chamber in the oil filter 4 is closed after the engine is stopped. Due to the air in a pressure-accumulated state, the oil 13 discharged from the oil filter 4 is supplied only to the turbocharger 9 through the passage 5 and the oil supply passage 7, so that efficient lubrication and cooling can be achieved with a small amount of oil.

Furthermore, if there is a sufficient amount of oil to be discharged, there is no need to provide the switch valve 12.

Next, the oil filter of the present invention will be explained in more detail with reference to the drawings.

FIG. 2 shows a longitudinal sectional view of the first embodiment of the present invention. In the figure, the right side of the center line shows the oil filter when the engine is operating, that is, in the pressure accumulation state.
The left side shows the state when the engine is stopped.

A cylindrical housing 40 with a closed lower end is attached to a filter base 41 and forms the outer shell of the oil filter 4. The filter base 41 has an oil outlet 42 in the center and a plurality of oil inlets 43 arranged concentrically outside the oil outlet 42.
A threaded portion 42a is provided on the inside to be threaded into a mounting bolt (not shown) on the engine body. A filter element 4 is disposed within the oil filter 4 so as to be concentric with the housing 40 with a gap provided therebetween.
4 is provided. The filter element 44 has a plurality of oil passages 44a inside, and has an open cylindrical portion 45 at one end, and the open cylindrical portion 45 is designed to fit into a convex portion 46 forming an oil outlet of the filter base 41. The filter element 44 and the filter base 41 are in a fitted state by being attached and the other end is closed by a presser plate 47, and the presser plate 47 is pressed at one end by a fixed spring 48 supported by the housing 40. is maintained.

Further, an oil bypass valve 6 is provided on the presser plate 47.
0 is provided, and the oil bypass valve 60 is provided with a spring 6
Normally, the oil 13 is cleaned by the filter element 44 and flows into the filter element 44 through the oil passages 44a provided inside the filter element 44, but at a constant oil pressure. When the amount exceeds 1, the oil bypass valve 60 is pushed up and the oil also flows into the filter element 44 from the bypass hole 62. A check valve 49 is provided inside the oil inlet 43 to prevent the oil 13 from flowing back.

The conventional oil filter 4 as described above is provided with a cylindrical partition wall 50 that separates a gap between the housing 40 and the filter element 44. In the case of this embodiment, the partition wall 50 is attached to the engine body (not shown) with the filter base 41 side facing upward.
with the filter base 41 side serving as a sealed end 51;
By attaching the oil communication port 52 on the opposite side, the gap between the partition wall 50 and the housing 40 is configured as an air reservoir chamber 53.

By incorporating the oil filter 4 as described above into the oil circuit as explained in FIG.
from the check valve 49 to the filter element 44
The filter element 44 is cleaned by the oil outlet 42 through the oil passage 44a inside the filter element 44.
It is supplied to the lubricating part of the engine body and the turbocharger.

As described above, when the engine is operating, the oil 13 filling the oil filter 4 is in a pressurized state, so that the air in the air reservoir chamber 53 changes from the state 532 when the engine is stopped to the accumulated pressure state 531.

When the engine is stopped in this state, the oil pressure in the oil filter 4 decreases, and the air in the air reservoir chamber 53 returns from the pressure accumulation state 531 to the state 532 when the engine is stopped. The oil is discharged outside the oil filter 4. By supplying this discharged amount of oil to the turbocharger bearing, even if the engine is stopped immediately after high-speed, high-load operation, the turbocharger bearing will be cooled and lubricated by a certain amount of oil, preventing seizure. be able to.

Next, a second embodiment will be explained with reference to FIG. This figure shows an embodiment of the oil filter 4 installed in an engine (not shown) in an upside-down direction, that is, with the filter base 41 side facing downward, and is different from the first embodiment. The structure is the same except for the way the partition wall 50 is attached.

In this embodiment, a cylindrical partition wall 50 having a substantially similar shape to the housing 40 is attached concentrically to the inner wall of the housing 40 by welding or the like, so that a closed end 51 and an oil communication port, which are opposite to those in the first embodiment, are connected to each other. 52, but the oil cleaning action and the oil discharge action after the engine is stopped are exactly the same as in the first embodiment.

The third embodiment shown in FIG. 4 is a combination of the first embodiment and the second embodiment, so that double partition walls 50a, 50b are provided in the oil filter 4, with opposite sealed ends 51a, 51b and Oil communication port 5
2a and 52b, a labyrinth structure is created, and an air pocket is created in the air pocket chamber 53 no matter how it is mounted above or below on the engine (not shown). And the operation is the same as the first embodiment and the second embodiment.

Further, in all of the above three embodiments, an air check valve 30 as shown in FIG. 4 may be provided in the vicinity of the closed end 51b in the air reservoir chamber 53, so that the amount of sealed air can be adjusted as necessary. .

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of an oil supply circuit for incorporating the oil filter of the present invention. FIG. 2 is a longitudinal sectional view of the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a second embodiment of the present invention. FIG. 4 is a longitudinal sectional view of a third embodiment of the present invention. 4...Oil filter with pressure accumulation function, 40
...Housing, 50, 50a, 50b...Partition wall, 53...Air reservoir chamber, 531...Air reservoir in pressure accumulation state, 532...Air reservoir when the engine is stopped, 52, 52a, 52b...Oil communication port ,9
...Turbo charger, 12...Switch valve.

Claims (1)

[Scope of utility model registration request] An oil filter housing is attached to a filter base to form an outer shell, and includes a filter element disposed within the housing concentrically with a gap, and an oil outlet communicating with the inside of the filter element; In the oil filter for a turbocharged engine, the oil filter for a turbocharged engine is provided with a plurality of oil inlets in the filter base that communicate with the gap outside the filter element, and the housing An air reservoir is formed between the inner wall and the partition wall, and an oil communication port is opened below the air reservoir, so that the air in the air reservoir is absorbed by the hydraulic pressure applied to the oil filter when the engine oil pump is operated. 1. An oil filter for an engine with a turbocharger, characterized in that the oil is compressed by the oil pump and becomes in a pressure-accumulated state, and when the oil pump is stopped, the oil is discharged to the outside of the oil filter by the accumulated air.