CN111188692A

CN111188692A - Device for improving engine oil dilution

Info

Publication number: CN111188692A
Application number: CN201811356639.8A
Authority: CN
Inventors: 刘贤利
Original assignee: Hitachi Automotive Systems Suzhou Ltd
Current assignee: Hitachi Astemo Automotive Systems Suzhou Ltd
Priority date: 2018-11-15
Filing date: 2018-11-15
Publication date: 2020-05-22

Abstract

The invention relates to a device for improving engine oil dilution. The device includes: an oil collecting ring (10) for scraping and collecting the coanda fuel oil; and an electrically controlled valve (11) for drawing collected fuel from the oil collection ring (10), wherein the oil collection ring (10) is arranged on the piston wall so that the coanda fuel collects in the oil collection ring (10) before it flows into the oil sump, and the electrically controlled valve (11) returns the collected fuel to the cylinder and burns again. By utilizing the technical scheme, the possibility that the wall-attached fuel oil is mixed into the oil pan can be fundamentally reduced or even eliminated, the engine oil dilution degree is directly and effectively reduced, and the purpose of optimizing the engine oil dilution is achieved.

Description

Device for improving engine oil dilution

Technical Field

The present invention relates to an apparatus for improving oil dilution, and more particularly, to an apparatus for improving oil dilution by returning coanda fuel to a cylinder and re-combusting it before it flows into an oil pan.

Background

Engine oil, i.e., lubricating oil in an automotive engine, has important functions of cleaning, lubricating, sealing, heat dissipation, and the like. Therefore, engine oil in an automobile engine is as important as blood in the human body. When the engine is in a cold start, high speed and high load condition, poor atomization of fuel is likely to occur. In this case, fuel droplets may adhere to the cylinder wall, then seep into the crankcase and flow into the oil pan, eventually mixing into the oil, resulting in the oil being diluted. This phenomenon is particularly pronounced in direct injection engines, due to insufficient atomization time and space conditions.

Excessive dilution of the oil can have two undesirable consequences. On one hand, the pressure and viscosity of the engine oil are correspondingly reduced due to the dilution of the engine oil, and the service life is shortened; on the other hand, the lubricating effect of the engine is deteriorated, which may increase the wear of the internal parts of the engine. For example, if insufficient lubrication is provided, the crank mechanism of the engine is easily damaged, the wear between the gears is increased, and the service life of the engine is greatly affected.

The industry is currently using methods to separate the oil mixed in the sump from the sump to prevent the oil from being too diluted. However, this solution requires, on the one hand, the design of complex monitoring, control and separation systems for the separation of the fuel from the oil, which is relatively costly; on the other hand, the absolute amount of separated fuel is not too high, and the cost performance is lower compared with the configuration cost of a monitoring, control and separation system.

For this reason, there is an urgent need to design a device that can effectively and economically improve the dilution of the engine oil.

Disclosure of Invention

The invention aims to provide a device capable of effectively and economically improving engine oil dilution.

A first aspect of the present invention relates to an apparatus for improving engine oil dilution, comprising: the oil collecting ring is used for scraping and collecting the wall-attached fuel oil; and an electrically controlled valve for drawing collected fuel from the oil collection ring, wherein the oil collection ring is disposed on the piston wall to collect the coanda fuel in the oil collection ring before it flows into the sump, and the electrically controlled valve returns the collected fuel to the cylinder for re-combustion.

In various embodiments of the present invention, the oil trap ring may be disposed at one of the following positions:

(i) a heat insulation groove on the piston wall;

(ii) an oil collecting ring groove arranged between the heat insulation groove on the piston wall and the first gas ring groove; or

(iii) And the oil collecting ring groove is arranged between the second gas ring groove and the oil ring groove of the piston wall.

Furthermore, in another embodiment of the present invention, an oil gathering ring may be provided in an oil gathering ring groove that opens below the oil ring groove of the piston wall. In this embodiment, the apparatus of the present invention also requires a fuel/oil separating device to separate the oil mixed into the collected fuel.

In yet another preferred embodiment of the present invention, the oil gathering ring is generally コ -shaped and includes an upper section, a lower section, and a connecting section adjacent the inner side of the oil gathering ring and connecting the upper section and the lower section.

In this embodiment, the outermost portions of the upper and/or lower sections of the oil gathering ring are chamfered or formed with sharp edges.

Alternatively, the portion of the oil gathering ring located outside the connecting section may have a thickness gradually decreasing from inside to outside or a thickness gradually decreasing from inside to outside and then gradually increasing, and the portion of the oil gathering ring located outside the connecting section may have a thickness gradually increasing from inside to outside or a thickness gradually decreasing from inside to outside and then gradually increasing.

Preferably, the lower section of the oil gathering ring may be partially hollowed out to form at least one oil containment chamber. More preferably, the upper portion of the oil trap chamber may be further formed with a baffle ring, which is inclined upward, horizontally or downwardly.

In the above embodiment, the device further comprises a leaf spring filled between the connecting section and the piston wall, thereby providing a radial unit area pressure to press the oil collecting ring against the piston wall.

Furthermore, the electrically controlled valve may be disposed in the cylinder wall at a position where the oil collecting ring is located when the ECU detects that the piston moves to the Bottom Dead Center (BDC), and preferably, the opening of the cylinder wall at which the electrically controlled valve is disposed is formed in a bell mouth shape.

A second aspect of the present invention is directed to a method of improving engine oil dilution, the method comprising the steps of:

(a) an apparatus for improving engine oil dilution is provided, the apparatus comprising: the oil collecting ring is used for scraping and collecting the wall-attached fuel oil; and an electrically controlled valve for sucking the collected fuel from the oil collecting ring;

(b) disposing an oil collection ring on the piston wall and collecting the coanda fuel oil in the oil collection ring before it flows into the oil pan;

(c) when the ECU detects that the piston moves to the bottom dead center, the electronic control valve is opened;

(d) the collected fuel in the oil collecting ring is sent back to the cylinder for burning again by using negative pressure.

The technical scheme has the advantages that: the invention adopts a design concept different from the prior art from the aim of optimizing the engine oil dilution, namely: the coanda fuel is collected in the oil collection ring before it flows from the piston wall into the oil sump and the fuel collected in the oil collection ring is returned to the cylinder and burned again by the negative pressure created in the intake manifold by means of the electrically controlled valve. Therefore, the possibility that the wall-attached fuel oil is mixed into the oil pan is fundamentally reduced or even eliminated, the engine oil dilution degree is directly and effectively reduced, and the purpose of optimizing the engine oil dilution is achieved.

Drawings

To further illustrate the structure and operation of the apparatus for improving oil dilution of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed description, wherein:

FIG. 1 is a schematic diagram of the general construction of an engine control system equipped with a first embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 2 is a schematic illustration of an engine cylinder equipped with a first embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 3 illustrates a first embodiment of an apparatus for improving oil dilution according to the present invention;

FIG. 4 is a schematic diagram of the general construction of an engine control system equipped with a second embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 5 is a schematic illustration of an engine cylinder equipped with a second embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 6 illustrates a second embodiment of an apparatus for improving oil dilution according to the present invention;

FIG. 7 is a schematic diagram of the general construction of an engine control system equipped with a third embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 8 is a schematic illustration of an engine cylinder equipped with a third embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 9 illustrates a third embodiment of an apparatus for improving oil dilution according to the present invention;

FIG. 10 is a schematic diagram of the general construction of an engine control system equipped with a fourth embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 11 is a schematic illustration of an engine cylinder equipped with a fourth embodiment of the apparatus for improving oil dilution of the present invention;

FIG. 12 illustrates a fourth embodiment of an apparatus for improving oil dilution according to the present invention;

fig. 13A to 13O are side sectional views of fifteen examples of oil collecting rings, respectively; and

fig. 14 is an enlarged partial schematic view of fig. 3, wherein details of the design of the electrically controlled valve for drawing fuel from the oil trap ring can be clearly seen.

Reference numerals

1 Heat insulation groove

2 first gas ring groove

3 second gas ring groove

4 oil ring groove

5 oil collecting ring groove

10 oil collecting ring

11 electric control valve

12 upper section

13 lower section

14 connecting section

15 sealing ring

16 oil storage chamber

17 baffle ring

101 fuel pump

102 electric control unit

103 throttle position switch

104 idle speed actuator

105 voltage regulator

106 air flow meter

107 spark plug

108 nozzle

109 oxygen sensor

Detailed Description

The apparatus for improving oil dilution of the present invention will now be described with reference to the drawings, wherein like parts are designated by like reference numerals.

The invention adopts a design concept different from the prior art from the aim of optimizing the engine oil dilution, namely: the device for improving the engine oil dilution mainly comprises an oil collecting ring for scraping and collecting the wall-attached fuel oil and an electric control valve for sucking the collected fuel oil from the oil collecting ring. The oil collection ring is added to the piston wall so that the coanda fuel collects in the oil collection ring before it flows from the piston wall into the oil sump. When the ECU detects that the piston moves to the bottom dead center, the electronic control valve is controlled to be opened, and the fuel collected in the oil collecting ring is sent back to the cylinder and is combusted again by utilizing the negative pressure generated in the intake manifold. Therefore, the possibility that the wall-attached fuel oil is mixed into the oil pan is fundamentally reduced or even eliminated, the engine oil dilution degree is directly and effectively reduced, and the purpose of optimizing the engine oil dilution is achieved.

(first embodiment)

Fig. 1 is a schematic diagram of the general structure of an engine control system equipped with a first embodiment of the apparatus for improving oil dilution of the present invention. Fig. 2 is a schematic illustration of an engine cylinder equipped with a first embodiment of the device for improving oil dilution of the present invention. It can be seen that the engine control system comprises, in addition to the device for improving oil dilution of the present invention, a fuel pump 101, an electronic control unit 102, a throttle position switch 103, an idle speed actuator 104, a pressure regulator 105, an air flow meter 106, a spark plug 107, a nozzle 108, an oxygen sensor 109, etc., and the engine cylinder comprises the spark plug 107 and the nozzle 108, etc. Since the structures of these components and the connection relationship between them are known to those skilled in the art and are not directly related to the inventive concept of the present invention, their detailed description and limitations are omitted herein.

Fig. 3 shows a first embodiment of the device for improving oil dilution according to the invention. In a first embodiment of the invention, the means for improving oil dilution comprises an oil collection ring 10 for scraping the coanda fuel and an electrically controlled valve 11 for drawing fuel from the oil collection ring 10. The piston of this embodiment is designed with four ring grooves in total, which are a heat insulation groove 1, a first ring groove 2, a second ring groove 3, and an oil ring groove 4 in the order from top to bottom in fig. 3, wherein an oil collecting ring 10 is provided in the heat insulation groove 1

It should be noted that the above "upper" and "lower" are given by way of example in the accompanying drawings. In practice, "upper" refers to a direction away from the bottom dead center of the piston, and "lower" refers to a direction closer to the bottom dead center of the piston. It will be apparent to those of ordinary skill in the art that the above terms can be appropriately modified in conjunction with variations of the embodiments.

The heat insulation groove 1 is not added with a ring and is mainly used for cutting off part of heat flow paths emitted from the top of the piston and forcing the heat flow direction to turn and disperse to the ring groove below. The design can eliminate carbon deposition caused by overheating of the first air ring and reduce the possibility of jamming of the first air ring.

First and second gas rings are disposed in the first and second

gas ring grooves

2, 3, respectively. The main roles of these gas rings include: a seal between the piston and the cylinder; and transferring most of the heat at the top of the piston to the cylinder wall, and cooling by a cooling system in the cylinder wall.

An oil ring is arranged in the oil ring groove 4. The main functions of the piston oil ring include: scraping off excess engine oil on the cylinder wall to prevent engine oil from entering the combustion chamber; coating a uniform engine oil film on the cylinder wall to reduce the friction between the piston and the cylinder wall; and sealing.

The oil collecting ring 10 is arranged in the heat insulation groove 1, and the function of heat flow dispersion of the oil collecting ring is not influenced, and the sealing and lubricating functions of the air ring and the oil ring are not influenced. Moreover, additional grooves for arranging the oil collecting ring 10 are not needed, and the machining process is reduced. However, such designs are relatively prone to carbon build-up and need to withstand the high temperatures and pressures of the combustion chamber.

(second embodiment)

Fig. 4 is a schematic diagram of the general structure of an engine control system equipped with a second embodiment of the apparatus for improving oil dilution of the present invention. Fig. 5 is a schematic illustration of an engine cylinder equipped with a second embodiment of the apparatus for improving oil dilution of the present invention. Fig. 6 shows a second embodiment of the device for improving oil dilution according to the invention. The figures described above are substantially similar to those shown in figures 1 to 3.

In a second embodiment of the invention, the means for improving oil dilution comprises an oil collection ring 10 for scraping the coanda fuel and an electrically controlled valve 11 for drawing fuel from the oil collection ring 10. The piston wall of this embodiment is designed with five ring grooves in total, which are a heat insulation groove 1, an oil collecting ring groove 5, a first ring groove 2, a second ring groove 3 and an oil ring groove 4 in sequence from top to bottom in fig. 6, wherein the oil collecting ring 10 is arranged in the oil collecting ring groove 5 separately provided for it, and the oil collecting ring groove 5 is located between the heat insulation groove 1 and the first ring groove 2.

Set up oil collection annular 5 specially between heat-insulating groove 1 and first annular 2, can keep all advantages of heat-insulating groove 1, promptly: the heat insulation groove 1 can disperse heat transferred from the top of the piston and is not easy to generate carbon deposition. Of course, the second embodiment has an increased difficulty in manufacturing compared to the first embodiment.

(third embodiment)

Fig. 7 is a schematic diagram of the general structure of an engine control system equipped with a third embodiment of the apparatus for improving oil dilution of the present invention. Fig. 8 is a schematic view of an engine cylinder equipped with a third embodiment of the device for improving oil dilution of the present invention. Fig. 9 shows a third embodiment of the device for improving oil dilution according to the present invention. The figures described above are substantially similar to those shown in figures 1 to 3.

In a third embodiment of the invention, the means for improving oil dilution comprises an oil collection ring 10 for scraping the coanda fuel and an electrically controlled valve 11 for drawing fuel from the oil collection ring 10. The piston wall of this embodiment is designed with four ring grooves altogether, which are, in fig. 9, a first gas ring groove 2, a second gas ring groove 3, an oil collecting ring groove 5 and an oil ring groove 4 in the order from top to bottom, wherein the heat insulation groove 1 is eliminated, the oil collecting ring 10 is arranged in the oil collecting ring groove 5 separately provided for it, and the oil collecting ring groove 5 is located between the second gas ring groove 3 and the oil ring groove 4.

Set up oil collecting ring groove 5 in second gas ring groove 3 below, and not add heat-insulating groove 1, its advantage includes: an insulating groove 1 is reduced, and the upper part of the oil collecting ring 10 is protected by an air ring, so that the heat and pressure born by the oil collecting ring are reduced to the minimum. However, a small amount of oil for lubrication infiltrates as compared with the first and second embodiments.

(fourth embodiment)

Fig. 10 is a schematic diagram of the general structure of an engine control system equipped with a fourth embodiment of the apparatus for improving oil dilution of the present invention. FIG. 11 is a schematic illustration of an engine cylinder equipped with a fourth embodiment of the apparatus for improving oil dilution of the present invention. Fig. 12 shows a fourth embodiment of the device for improving oil dilution according to the present invention. The figures described above are substantially similar to those shown in figures 1 to 3.

In a fourth embodiment of the invention, the means for improving oil dilution comprises an oil collection ring 10 for scraping the coanda fuel and an electrically controlled valve 11 for drawing fuel from the oil collection ring. The piston wall of this embodiment is designed with four ring grooves altogether, which in fig. 12 are, in the direction from top to bottom, a first gas ring groove 2, a second gas ring groove 3, an oil ring groove 4 and an oil collecting ring groove 5 in that order, wherein the heat insulating groove 1 is eliminated, the oil collecting ring 10 is arranged in the oil collecting ring groove 5 separately provided for it, and the oil collecting ring groove 5 is located below the oil ring groove 4.

The oil collecting ring groove 5 is arranged below the oil ring groove 4, and basically no interference is generated on the upper part of the piston. However, since a large amount of oil for upward lubrication is mixed in the collected fuel, a fuel/oil separating device needs to be additionally installed.

A typical separator device includes an electronic suction valve (not shown) on the cylinder wall that is connected to an external canister solenoid valve for adsorption of fuel and returns cleaned oil to the sump. When the fuel oil adsorbed by the carbon tank electromagnetic valve reaches a certain amount, the valve is opened, and the stored fuel oil is sucked into the combustion chamber by means of the negative pressure in the air inlet manifold. Of course, it will be apparent to those skilled in the art that other types of separation devices may be used and are considered to fall within the scope of the present invention.

Fig. 13A to 13O are side sectional views of fifteen examples of the oil collection ring 10, respectively. It can be seen that the oil gathering ring 10 is generally コ shaped, including an upper section 12, a lower section 13, a connecting section 14 adjacent the inside of the oil gathering ring 10 and connecting the upper and

lower sections

12, 13, and a leaf spring 15 filling between the connecting section 14 and the piston wall. The plate-lined spring 15 is able to provide sufficient radial area pressure on the radially inner side of the oil gathering ring to hold the oil gathering ring 10 against the piston wall.

It should be noted that the above-mentioned "upper", "lower", "inner" and "outer" are given by way of example in the accompanying drawings. In practice, "upper" refers to a direction away from the bottom dead center of the piston, while "lower" refers to a direction toward the bottom dead center of the piston, "inner" refers to a direction toward the center axis of the piston, and "outer" refers to a direction away from the center axis of the piston. It will be apparent to those of ordinary skill in the art that the above terms can be appropriately modified in conjunction with variations of the embodiments.

Fig. 13A shows a first example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper section 12, a lower section 13, a connecting section 14, and a plate spring 15, wherein the portions of the upper and

lower sections

12 and 13 located outside the connecting section 14 have uniform and equal thicknesses to each other. Therefore, the outermost thin edges of the upper section 12 and the lower section 13 can be used to scrape off the coanda fuel.

Fig. 13B shows a second example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions of the upper section 12, the lower section 13, the connecting section 14, and the plate bushing spring 15, wherein the portions of the upper section 12 and the lower section 13 located outside the connecting section 14 have substantially uniform and equal thicknesses to each other, but the outermost thin edges of the upper section 12 and the lower section 13 are chamfered. This configuration can reduce friction between the thin edge and the cylinder wall.

Fig. 13C shows a third example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14, and a plate-lined spring 15, wherein the portion of the upper portion 12 located outside the connecting portion 14 has a thickness gradually decreasing from the inside to the outside. That is, the outermost thin edge of the upper section 12 is modified to be a sharp edge. This configuration can enhance the oil scraping effect in the downward movement.

Fig. 13D shows a fourth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14, and a plate spring 15, wherein the portion of the lower portion 13 located outside the connecting portion 14 has a thickness gradually increasing from the inside to the outside. That is, the outermost feathered edges of the lower section 13 are modified to sharp edges. This configuration can enhance the oil scraping effect in ascending.

Fig. 13E shows a fifth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14 and a plate spring 15, wherein the portion of the upper portion 12 located outside the connecting portion 14 has a thickness gradually decreasing from inside to outside, and the portion of the lower portion 13 located outside the connecting portion 14 has a thickness gradually increasing from inside to outside. That is, the outermost thin edges of the upper section 12 and the lower section 13 are each modified to be sharp edges. This configuration can further enhance the oil scraping effect of the piston.

Fig. 13F shows a sixth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four parts, an upper section 12, a lower section 13, a connecting section 14 and a plate-lined spring 15, wherein the part of the upper section 12 located outside the connecting section 14 has a thickness that gradually decreases from the inside to the outside but increases as compared with the third and fifth examples, and the part of the lower section 13 located outside the connecting section 14 has a thickness that gradually increases from the inside to the outside. The sixth example design overcomes this drawback because the thin edge of the upper section 12 is too sharp, which tends to dull and potentially cause significant damage to the cylinder wall during actual use.

Fig. 13G shows a seventh example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14, and a plate-lining spring 15, wherein the portion of the upper portion 12 located outside the connecting portion 14 has a thickness gradually decreasing from inside to outside and then gradually increasing, and the portion of the lower portion 13 located outside the connecting portion 14 has a thickness gradually decreasing from inside to outside and then gradually increasing. This configuration can serve as a drainage function by curving the upper section 12 and the lower section 13. In addition, the depression formed by the lower section 13 may be used to store scraped fuel.

Fig. 13H shows an eighth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four parts, an upper section 12, a lower section 13, a connecting section 14, and a plate-lined spring 15, wherein the part of the upper section 12 located outside the connecting section 14 has a thickness which gradually decreases from inside to outside and then gradually increases, and which decreases compared with the seventh example, and the part of the lower section 13 located outside the connecting section 14 has a thickness which gradually decreases from inside to outside and then gradually increases, and which increases compared with the seventh example. This configuration can improve the feathered drainage of the upper section 12. .

Fig. 13I shows a ninth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is composed of four parts, an upper section 12, a lower section 13, a connecting section 14 and a plate spring 15, wherein the part of the upper section 12 located outside the connecting section 14 has a thickness gradually decreasing from inside to outside and then gradually increasing from inside to outside, and the part of the lower section 13 located outside the connecting section 14 has a thickness gradually increasing from inside to outside. The portion of the lower section 13 adjacent the connecting section 14 is partially hollowed out to form a generally rectangular oil retention chamber 16. Compared to the seventh and eighth examples, the oil reserving capacity of the oil reserving chamber 16 is stronger than that of the dimple, so that most of the fuel stored in the dimple can be attached to the cylinder wall again.

Fig. 13J shows a tenth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14, and a plate-lining spring 15, wherein the portion of the upper portion 12 located outside the connecting portion 14 has a thickness gradually decreasing from inside to outside and then gradually increasing from inside to outside, and the portion of the lower portion 13 located outside the connecting portion 14 has a thickness gradually increasing from inside to outside. The portion of the lower section 13 adjacent the connecting section 14 is partially hollowed out to form an oil retention chamber 16. The oil reserving chamber 16 is chamfered to reduce the viscosity of the fuel.

Fig. 13K shows an eleventh example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14 and a plate spring 15, wherein the portion of the upper portion 12 located outside the connecting portion 14 has a thickness gradually decreasing from inside to outside and then gradually increasing from inside to outside, and the portion of the lower portion 13 located outside the connecting portion 14 has a thickness gradually increasing from inside to outside. The portion of the lower section 13 remote from the connecting section 14 is partially hollowed out to form an oil holding chamber 16. The oil reserving chamber 16 is chamfered to reduce the viscosity of the fuel. Compared to the eleventh example, the oil reserving chamber 16 is closer to the cylinder wall, and the oil reserving space is increased.

Fig. 13L shows a twelfth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14 and a plate spring 15, wherein the portion of the upper portion 12 located outside the connecting portion 14 has a thickness gradually decreasing from inside to outside and then gradually increasing from inside to outside, and the portion of the lower portion 13 located outside the connecting portion 14 has a thickness gradually increasing from inside to outside. The portion of the lower section 13 remote from the connecting section 14 is partially hollowed out to form an oil trap chamber 16 with an upwardly inclined baffle ring 17 at the upper part. This configuration can prevent the fuel stored in the fuel reservoir chamber from being shaken out and adhering to the cylinder wall again due to the large size of the fuel reservoir chamber when the piston moves up and down.

Fig. 13M shows a thirteenth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four portions, an upper portion 12, a lower portion 13, a connecting portion 14 and a plate spring 15, wherein the portion of the upper portion 12 located outside the connecting portion 14 has a thickness gradually decreasing from inside to outside and then gradually increasing from inside to outside, and the portion of the lower portion 13 located outside the connecting portion 14 has a thickness gradually increasing from inside to outside. The portion of the lower section 13 remote from the connecting section 14 is partially hollowed out to form an oil trap chamber 16 with a horizontally extending baffle ring 17 at the upper part. By modifying the upwardly inclined baffle ring to be a horizontally extending baffle ring, the problem of fuel sliding from the upper section 12 via the connecting section 14 into the inside of the oil collecting ring 10 not being able to enter the oil retention chamber 16 can be solved.

Fig. 13N shows a fourteenth example of the oil gathering ring 10, and it can be seen that the oil gathering ring 10 is substantially コ -shaped and is constituted by four parts, an upper section 12, a lower section 13, a connecting section 14 and a plate-lined spring 15, wherein the part of the upper section 12 located outside the connecting section 14 has a thickness which is gradually reduced from inside to outside and is thickened as compared with the thirteenth example, and the part of the lower section 13 located outside the connecting section 14 has a thickness which is gradually increased from inside to outside. The portion of the lower section 13 remote from the connecting section 14 is partially hollowed out to form an oil trap chamber 16 with a horizontally extending baffle ring 17 at the upper part. By modifying the thickness of the upper section 12, on the one hand, the problem of wear failure due to too thin local section thickness of the upper section can be prevented, and on the other hand, the drainage tendency of the upper section can be made more pronounced.

Fig. 13O shows a fifteenth example of the oil collection ring 10, and it can be seen that the oil collection ring 10 is substantially コ -shaped and is constituted by four parts, an upper section 12, a lower section 13, a connecting section 14, and a plate-lined spring 15, wherein the part of the upper section 12 located outside the connecting section 14 has a thickness which is gradually reduced from the inside to the outside and is thickened as compared with the thirteenth example, and the part of the lower section 13 located outside the connecting section 14 has a thickness which is gradually increased from the inside to the outside. The portion of the lower section 13 remote from the connecting section 14 is partially hollowed out to form an oil trap chamber 16 with a downwardly sloping baffle ring 17 at the upper part. By modifying the upwardly inclined or horizontally extending baffle ring to be a downwardly inclined baffle ring, the weight of the coanda fuel itself can be utilized to further promote the smooth entry of fuel that slides inside the oil catcher ring 10 via the connecting section 14 into the oil retention chamber 16.

In the present invention, although the fifteenth example shown in fig. 13O is the best embodiment, it should be understood by those skilled in the art that the examples shown in fig. 13A to 13N and other alternative embodiments derived based on these examples are all within the protection scope of the present invention.

The oil gathering ring 10 shown in any of the examples described above is typically made of a material that is heat resistant, wear resistant, high strength, and impact resistant. For example, high-quality cast iron may be selected and a small amount of an alloy element such as copper, chromium, molybdenum, or the like may be added as a material. Of course, other suitable materials may be used and are within the scope of the present invention.

Fig. 14 is an enlarged schematic view of the electrically controlled valve 11 drawing fuel from the oil trap ring 10. An electrically controlled valve 11 (typically a solenoid valve) is provided in the cylinder wall at the position where the oil gathering ring 10 will be when the ECU detects that the piston is moving to BDC. When the ECU detects that the piston is moving to BDC, the oil gathering ring 10 properly reaches the electronically controlled valve 11. At this time, the electrically controlled valve 11 is opened and the fuel collected in the oil collecting ring 10 is returned to the cylinder by the negative pressure generated in the intake manifold and burned again. In order to solve the problem that the head of the electromagnetic valve is difficult to be made into a curved surface shape consistent with the cylinder wall, the opening of the cylinder wall where the electric control valve 11 is located can be made into a bell mouth shape, and the throat of the bell mouth is the final stroke of the head of the electromagnetic valve. In this way, it is ensured that the fuel collected in the oil collection ring 10 is sucked out of the oil collection ring 10 as far as possible, and the bell-mouth-shaped opening prevents the fuel from depositing in the travel passage of the solenoid valve head.

The operation of the device for improving oil dilution of the present invention will be briefly described.

Since the oil collecting ring 10 is installed on the wall of the piston as described earlier, the sharp edges of the upper section 12 and the lower section 13 of the oil collecting ring 10 located outside the connecting section 14 can scrape off the fuel adhered to the wall of the cylinder when the piston reciprocates. The collected fuel then flows into the lower section 13 away from the oil retention chamber 16 of the connecting section 14 and is stored there. Since the trap chamber 16 is equipped with the downward-inclined baffle ring 17, it is possible to further promote the fuel, which has slipped inside the oil trap ring 10 via the connecting section 14, into the trap chamber 16 more smoothly by the gravity of the coanda fuel itself.

When the ECU detects that the piston is moving to BDC, an electronically controlled valve 11 provided in the cylinder wall opens. At this time, the oil collecting ring 10 properly reaches the electrically controlled valve 11. The electrically controlled valve 11 is typically a solenoid valve. The pressure in the travel passage of the solenoid valve head will be 50-80Kpa above atmospheric pressure and the passage is therefore at a negative pressure. With the electric control valve 11 opened, the oil collecting ring 10 is communicated with the valve port, and the negative pressure in the channel sucks the fuel oil collected in the oil collecting ring 10 into the intake manifold and sends the fuel oil back to the cylinder for burning again.

While the structure and operation of the apparatus for improving oil dilution of the present invention has been described with reference to several embodiments, those skilled in the art will recognize that the foregoing examples are illustrative only and are not to be construed as limiting the present invention. Therefore, modifications and variations of the present invention may be made within the true spirit and scope of the claims, and these modifications and variations are intended to fall within the scope of the claims of the present invention.

Claims

1. An apparatus for improving engine oil dilution comprising:

an oil collecting ring (10) for scraping and collecting the coanda fuel oil; and

an electrically controlled valve (11) for drawing the collected fuel from the oil collecting ring (10),

wherein the oil collecting ring (10) is arranged on the piston wall so that the coanda fuel is collected in the oil collecting ring (10) before it flows into the oil sump, and the electrically controlled valve (11) returns the collected fuel to the cylinder and is combusted again.

2. The arrangement for improving the dilution of engine oil according to claim 1, characterized in that the oil-collecting ring (10) is arranged in one of the following positions:

(i) the heat insulation groove (1) on the piston wall;

(ii) an oil collecting ring groove (5) arranged between the heat insulation groove (1) on the piston wall and the first gas ring groove (2); or

(iii) And the oil collecting ring groove (5) is arranged between the second gas ring groove (3) and the oil ring groove (4) on the piston wall.

3. The arrangement for improving the dilution of engine oil according to claim 1, characterized in that the oil-collecting ring (10) is arranged in an oil-collecting ring groove (5) opening below the oil ring groove (4) in the piston wall.

4. The apparatus for improving dilution of engine oil of claim 3, further comprising a fuel/oil separation device for separating engine oil mixed into the collected fuel.

5. The arrangement for improving the dilution of engine oil according to claim 1, wherein the oil gathering ring (10) is generally コ -shaped and includes an upper section (12), a lower section (13), and a connecting section (14) adjacent to the inner side of the oil gathering ring (10) and connecting the upper section (12) and the lower section (13).

6. The arrangement for improving the dilution of engine oil according to claim 5, characterized in that the outermost portions of the upper section (12) and/or the lower section (13) of the oil gathering ring (10) are chamfered or formed with sharp edges.

7. The arrangement for improving the dilution of oil according to claim 5, characterized in that the portion of the upper section (12) of the oil gathering ring (10) located outside the connecting section (14) has a thickness that decreases gradually from the inside to the outside or that decreases gradually first and then increases gradually from the inside to the outside, and the portion of the lower section (13) of the oil gathering ring (10) located outside the connecting section (14) has a thickness that increases gradually from the inside to the outside or that decreases gradually first and then increases gradually from the inside to the outside.

8. The device for improving the dilution of engine oil according to claim 5, wherein the lower section (13) of the oil gathering ring (10) is partially hollowed out to form at least one oil trap chamber (16), preferably wherein the oil trap chamber (16) is formed with a baffle ring (17) at an upper portion thereof, and wherein the baffle ring (17) is inclined upward, horizontally or downward.

9. The arrangement for improving oil dilution according to any one of claims 5-8, further comprising a leaf spring (15) filled between the connecting section (14) and the piston wall, providing a radial unit area pressure to press the oil gathering ring (10) against the piston wall.

10. The arrangement for improving the dilution of engine oil according to claim 1, wherein the electrically controlled valve (11) is arranged in the cylinder wall at the position where the oil collecting ring (10) is located when the ECU detects that the piston moves to the bottom dead center, preferably wherein the opening of the cylinder wall provided with the electrically controlled valve (11) is flared.