JP3991496B2 - Oil and blow-by gas centrifuges for internal combustion engines. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention separates and removes foreign matter and bubbles mixed in oil in an oil pan of the internal combustion engine, and separates and removes oil and foreign matter mixed in blow-by gas in the crankcase of the internal combustion engine. The present invention relates to an oil and blow-by gas centrifuge .
[0002]
[Prior art]
Conventionally, as prior art documents related to centrifugation , those disclosed in Japanese Utility Model Publication No. 47-9392 are known. In this technology, a filter (filter) composed of two upper and lower chambers is constructed, and a foreign matter (sludge) in oil is separated in the lower chamber using centrifugal force, and a foreign matter in blow-by gas is separated in the upper chamber. It is shown.
[0003]
[Problems to be solved by the invention]
By the way, in the above-mentioned thing, the oil from which the foreign material was separated and removed and the blow-by gas are sent to the same oil pan. That is, the blow-by gas has foreign substances separated and removed, but there is a problem that the airtightness in the crankcase is impaired when the gas pressure in the oil pan is excessively increased by the blow-by gas.
[0004]
Therefore, the present invention has been made to solve such a problem. Oil that has been separated and removed by centrifugal force is returned to the oil pan, and the gas component is returned to the intake system to be reburned for oil purification. In addition, an object of the present invention is to provide an oil and blow-by gas centrifugal separator for an internal combustion engine capable of reducing emissions.
[0005]
[Means for Solving the Problems]
According to the oil and blow-by gas centrifugal separator of the internal combustion engine of claim 1, oil and blow-by gas are inserted from the base side through a shaft member that is fitted to the base and rotatably supports the rotor member. The oil is introduced into an oil separation chamber and a blow-by gas separation chamber in the rotor member. The oil separation chamber can simultaneously perform the separation of foreign matter in the oil and the blow-by gas separation chamber can separate the oil component and the foreign matter in the blow-by gas. The oil after the foreign matter has been separated can be discharged to the outside through an oil discharge path, and the blow-by gas after the oil component and the foreign matter have been separated can be discharged to the blow-by gas discharge path through separate flow paths. Therefore, the oil can be returned to the oil pan side of the internal combustion engine, and the blow-by gas can be sucked into the intake system of the internal combustion engine and recombusted. Thereby, the oil can be efficiently cleaned and the emission can be reduced.
[0006]
In addition, the oil separation chamber is disposed on the outer peripheral side of the blow-by gas separation chamber, and the centrifugal force can be effectively used, so that foreign matters in the oil are efficiently separated. Further, since the oil separation chamber and the blow-by gas separation chamber are arranged concentrically, the physique in the axial direction can be shortened.
[0007]
In the oil and blow-by gas centrifugal separator of the internal combustion engine according to claim 2 , the rotor member is rotated by the jet power of the oil itself ejected from the jet hole. That is, since the driving force from the outside is not necessary for the rotation of the rotor member, it can be made inexpensive with a very simple configuration.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, description will be made based on an example of an oil and blow-by gas centrifugal separator of an internal combustion engine according to an embodiment of the present invention.
[0009]
<Example 1>
FIG. 1 is a schematic diagram showing the flow of oil and blow-by gas in an internal combustion engine to which a centrifugal separator according to a first example of an embodiment of the present invention is applied, and FIG. 2 is a first diagram of the embodiment of the present invention. It is sectional drawing which shows the whole structure of the centrifuge concerning one Example. In addition, in the following figures, the thing which consists of the same structure or an equivalent part attaches | subjects the same code | symbol and the same symbol, and the overlapping description is abbreviate | omitted.
[0010]
As shown in FIG. 1, oil (lubricating oil) stored in the oil pan 2 of the internal combustion engine 1 is pumped by an oil pump 4 through an oil strainer 3 as indicated by solid arrows in the figure. The oil filter 7 having a well-known element and a part of the oil flowing to the oil filter 7 side are pressure-fed to the centrifuge 100 having the configuration described later. The clean oil filtered by one oil filter 7 is sent to the lubrication part 1a of the internal combustion engine 1 and contributes to lubrication of each part, and then returned to the oil pan 2. Clean oil from which foreign matter has been separated and removed in an oil separation chamber 35 described later in the other centrifugal separator 100 is returned to the oil pan 2.
[0011]
Further, blow-by gas is introduced into the centrifugal separator 100 from the crankcase 1 b of the internal combustion engine 1. The blow-by gas from which oil and foreign matter are separated and removed in a later-described blow-by gas separation chamber 38 in the centrifugal separator 100 is sent to the intake system 1c of the internal combustion engine 1 as indicated by the white arrow in the figure. And reburned. The oil component separated by the centrifuge 100 is returned to the oil pan 2.
[0012]
Here, 5 is a relief valve for returning excess oil by the oil pump 4, 6 is a check valve for preventing the return of oil from the oil filter 7 to the oil pan 2 side when the oil pump 4 is stopped, A relief valve 9 forms a bypass when the oil filter 7 and the centrifuge 100 are clogged.
[0013]
In FIG. 2, the centrifuge 100 includes a substantially cylindrical cover in which a rotor 30 including a rotor body 31 and a rotor cover 32 is rotatably supported on a shaft member 20 that is inserted into the center of a substantially columnar body 10. The outer periphery of the rotor 30 is covered by 18 and is sealed through the seal member 16. Oil (see a solid line arrow) is supplied from an oil pump 4 to an oil supply path 11 formed in the body 10, and a crank is inserted into a blow-by gas introduction path 15 from between a piston (not shown) and a cylinder wall of the internal combustion engine 1. Blow-by gas (see white arrow) leaking into the case 1b is introduced. The oil supplied to the oil supply passage 11 of the body 10 and the blow-by gas introduced into the blow-by gas introduction passage 15 are sent out to the respective communication passages 21 and 22 formed in the shaft member 20.
[0014]
In the rotor 30, an oil separation chamber 35 that separates foreign matters in oil and a blow-by gas separation chamber 38 that separates oil components and foreign matters in blow-by gas are formed concentrically with respect to the shaft member 20. In the present embodiment, the oil separation chamber 35 is arranged in a concentric relationship with the outer peripheral side and the blow-by gas separation chamber 38 is the inner peripheral side, and the rotor body 31 is covered with the rotor cover 32 via the seal members 33 and 34. Thus, the oil separation chamber 35 and the blow-by gas separation chamber 38 are isolated. Oil and blow-by gas that have passed through the communication passages 21 and 22 of the shaft member 20 flow into the oil separation chamber 35 and the blow-by gas separation chamber 38, respectively.
[0015]
The oil that has flowed into the oil separation chamber 35 rotates the rotor 30 by the jetting power in the facing direction from the two jetting holes 36 symmetrically about the central axis. Foreign matter in the oil is captured and separated by the inner wall surface of the oil separation chamber 35 by the centrifugal force due to this rotation. The clean oil from which the foreign matter has been separated and removed passes through the passage 12 of the body 10 from the oil ejection hole 36 and is discharged out of the centrifugal separator 100 through the oil discharge passage 13 on the lower surface, and the oil pan below the internal combustion engine 1. 2 (see FIG. 1).
[0016]
The blow-by gas separation chamber 38 is also rotated by the rotation of the oil separation chamber 35 of the rotor 30. Then, the oil content and foreign matter in the blow-by gas flowing into the blow-by gas separation chamber 38 are captured and separated by the inner wall surface of the blow-by gas separation chamber 38. Thereafter, the blow-by gas is sucked into the intake system 1c of the internal combustion engine 1 from a blow-by gas discharge passage 23 formed in the shaft member 20 through a pipe (not shown) and recombusted (see FIG. 1). The oil component in the blow-by gas separated in the blow-by gas separation chamber 38 is returned to the oil pan 2 together with the oil from the oil separation chamber 35.
[0017]
As described above, the centrifugal separator 100 according to this embodiment includes the oil supply passage 11 that supplies oil in the oil pan 2 of the internal combustion engine 1 and the blowby gas introduction passage that introduces blowby gas in the crankcase 1b of the internal combustion engine 1. 15, a body 10 as a base for forming an oil discharge passage 13 for discharging oil after foreign matter is separated from the oil, and a body 10 inserted into the body 10 and inserted into the oil supply passage 11 and the blow-by gas introduction passage 15, respectively. The connecting members 21 and 22 through which oil and blow-by gas are connected, the shaft member 20 forming the blow-by gas discharge passage 23 for discharging the blow-by gas after the oil and foreign matter are separated from the blow-by gas, and the shaft member 20 An oil separation chamber 3 that is rotatably supported by the shaft and separates foreign matter from oil flowing in through one communication passage 21 of the shaft member 20. And a blowby gas separation chamber 38 for separating oil and foreign matter from blowby gas flowing in through the other communication passage 22 of the shaft member 20, and separating oil from an ejection hole 36 provided in the lower part of the oil separation chamber 35. The oil after the foreign matter is separated in the chamber 35 is ejected to the body 10 side, and the blow-by gas after the oil and the foreign matter are separated in the blow-by gas separation chamber 38 is sent to the blow-by gas discharge passage 23 of the shaft member 20. And the cover 18 that projects the blow-by gas discharge passage 23 of the shaft member 20 to the outside and covers the outer periphery of the rotor 30 and is coupled to the body 10.
[0018]
That is, in the centrifugal separator 100, oil and blow-by gas are inserted from the body 10 side through the shaft member 20 that is inserted into the body 10 and rotatably supports the rotor 30, and the oil separation chamber 35 in the rotor 30 and the blow-by gas are supplied. The gas is separated into the gas separation chamber 38. The oil separation chamber 35 can separate the foreign matter in the oil and the blow-by gas separation chamber 38 can simultaneously separate the oil component and the foreign matter in the blow-by gas. The oil after the foreign matter is separated is the oil discharge passage 13, and the blow-by gas after the oil component and the foreign matter are separated is sent to the blow-by gas discharge passage 23 in a separate flow path outside the centrifuge 100. Can be discharged. Therefore, the oil can be returned to the oil pan 2 of the internal combustion engine 1, and the blow-by gas can be sucked into the intake system 1c of the internal combustion engine 1 and recombusted. As a result, the oil can be efficiently cleaned and emission can be reduced.
[0019]
Further, the centrifugal separator 100 of the present embodiment is concentrically disposed so that the oil separation chamber 35 is located on the outer peripheral side of the blow-by gas separation chamber 38 with respect to the shaft member 20 in the rotor 30. As described above, since the oil separation chamber 35 is disposed on the outer peripheral side of the blow-by gas separation chamber 38, the centrifugal force (jet power) due to the oil jetting is effectively used, and the foreign matter in the oil and the oil content in the blow-by gas. And foreign substances can be separated efficiently. Furthermore, since the oil separation chamber 35 and the blow-by gas separation chamber 38 are disposed concentrically, the physique in the axial direction can be shortened.
[0020]
In the centrifugal separator 100 of the present embodiment, the rotor 30 is rotated by the jet power of the oil jetted from the jet hole 36. Thus, since the rotor 30 is rotated by the jet output of the oil itself and does not require another driving force, separation and removal of foreign matters and the like by centrifugal force can be achieved with a very simple configuration.
[0021]
By the way, in the above-described embodiment, the oil discharged from the oil discharge passage 13 of the centrifuge 100 is returned to the oil pan 2 by its own weight, but as shown in FIG. An oil pump P may be disposed on the downstream side of the oil discharge path 13 of the centrifuge 100. Accordingly, clean oil from the centrifugal separator 100 can be directly pumped to the lubricating part 1a of the internal combustion engine 1 by the oil pump P. Therefore, the oil filter (filter paper filter) on the main stream side in the flow path shown in FIG. ) The centrifuge 100 can be installed instead of 7.
[0022]
In the above-described embodiment, the jet output of the oil itself is used as a drive source for rotating the rotor 30. However, as shown in FIG. 4, the electric motor M or the internal combustion engine 1 is used. The driving force from the outside can also be used together.
[0023]
FIG. 5 is a perspective view showing the overall configuration of a third modified example of the centrifuge according to the first example of the embodiment of the present invention, and FIG. 6 is a cross-sectional view showing the main configuration of FIG. . In the figure, components having the same configuration or corresponding parts as those in the above-described embodiment are denoted by the same reference numerals and symbols, and detailed description thereof is omitted.
[0024]
As shown in FIGS. 5 and 6, the oil pan 2 of the internal combustion engine 1 in this modification includes an aluminum oil pan 2 a and a steel plate oil pan 2 b. In the centrifugal separator 200 of this modification, the body 110 portion is integrally formed using the aluminum oil pan 2a portion, and the body 110 portion integral with the aluminum oil pan 2a is covered with a cover 118. Configured. Here, the rotor (not shown) in the cover 118 that is pivotally supported and rotated by the shaft member 120 of the centrifuge 200 is configured in the same manner as in FIG. 2 in the first embodiment described above.
[0025]
The centrifuge 200 separates foreign matter from oil supplied from an oil supply passage 115 formed in a body 110 portion integrally formed with the aluminum oil pan 2a and blow-by gas introduced from a blow-by gas introduction passage 111. The removed oil is returned to the oil pan 2 from the oil discharge path 113, and the blow-by gas from which the oil and foreign matters are separated and removed is discharged from the blow-by gas discharge path 123 of the shaft member 120.
[0026]
For this reason, by using the centrifuge 200 of this modification, in addition to the effect in the first embodiment, the discharged oil is directly returned onto the oil surface of the oil pan 2 without piping. Is possible. As a result, oil is smoothly discharged from the centrifuge 200, so that oil does not stay in the centrifuge 200 and is prevented from obstructing rotation of the rotor (not shown).
[0027]
<Example 2>
FIG. 7 is a cross-sectional view showing the overall configuration of the centrifuge according to the second example of the embodiment of the present invention. In the figure, components having the same configuration or corresponding parts as those of the above-described embodiment are denoted by the same reference numerals and symbols, and the description is simplified.
[0028]
As shown in FIG. 7, the centrifuge 300 of the present embodiment is configured such that the rotor 30 composed of the rotor body 31 and the rotor cover 32 is rotatable about a shaft member 220 inserted into the center of a substantially cylindrical body 210. The outer periphery of the rotor 30 is covered by a substantially cylindrical cover 18 and is sealed via a seal member 16. Oil (see a solid line arrow) is supplied from an oil pump (not shown) to an oil supply path 211 formed in the body 210. The oil supplied to the oil supply path 211 of the body 210 is sent to two communication paths 221 and 222 formed in the shaft member 220.
[0029]
In the rotor 30, an oil separation chamber 35 that separates foreign matters in the oil and a bubble separation chamber 38 ′ that separates bubbles (air) in the oil (see the dashed white arrows) are concentric with the shaft member 220. Is formed. In the present embodiment, the oil separation chamber 35 is arranged in a concentric relationship with the outer peripheral side and the bubble separation chamber 38 ′ is on the inner peripheral side, and the rotor body 31 is covered with the rotor cover 32 via the seal members 33 and 34. Thus, the oil separation chamber 35 and the bubble separation chamber 38 'are isolated. Oil that has passed through the communication passages 21 and 22 of the shaft member 220 flows into the oil separation chamber 35 and the bubble separation chamber 38 ′, respectively.
[0030]
The oil flowing into the oil separation chamber 35 rotates the rotor 30 by the jet output from the jet hole 36. Foreign matter in the oil is captured and separated by the inner wall surface of the oil separation chamber 35 by the centrifugal force due to this rotation. The clean oil from which foreign matter has been separated and removed passes through the passage 212 of the body 210 from the oil ejection hole 36 and is discharged out of the centrifugal separator 300 through the oil discharge passage 213 on the lower surface, and the oil pan 2 below the internal combustion engine 1. (See FIG. 1).
[0031]
The bubble separation chamber 38 ′ is also rotated by the rotation of the oil separation chamber 35 of the rotor 30. Then, the bubbles in the oil flowing into the bubble separation chamber 38 'are separated on the inner wall surface of the bubble separation chamber 38'. After that, bubbles , that is, gas, are sucked into the intake system (not shown) of the internal combustion engine from the gas discharge passage 223 formed in the shaft member 220 through a pipe (not shown) and recombusted. The oil component in the oil separated in the bubble separation chamber 38 'is returned together with the oil from the oil separation chamber 35 to the oil pan.
[0032]
As described above, the centrifugal separator 300 according to this embodiment includes the oil supply path 210 that supplies oil in the oil pan 2 of the internal combustion engine 1 and the oil discharge path 213 that discharges oil after foreign matters are separated from the oil. A body 210 as a base for forming a gas , two communication paths 221 and 222 inserted into the body 210, connected to the oil supply path 210 and through which oil passes, and a gas discharge path 223 for discharging the gas separated from the oil A shaft member 220 that forms a shaft, and an oil separation chamber 35 that is rotatably supported by the shaft member 220 and separates foreign matter from oil flowing in through one communication passage 221 of the shaft member 220 and the other of the shaft member 220. A bubble separation chamber 38 ′ for separating bubbles from the oil flowing in via the communication passage 222, and the oil separation chamber 35 is different from an ejection hole 36 provided in the lower part of the oil separation chamber 35. Together but ejecting oil after being separated to the body 210 side, a rotor 30 for delivering 'the gas separated from the oil in a gas discharge passage 38 of the shaft member 220' bubble separation chamber 38, the shaft member 220 The gas discharge path 223 protrudes to the outside, and the cover 18 that covers the outer periphery of the rotor 30 and is coupled to the body 210 is provided.
[0033]
That is, in the centrifugal separator 300, oil is supplied from the body 210 side through the shaft member 220 that is inserted into the body 210 and rotatably supports the rotor 30, and the oil separation chamber 35 and the bubble separation chamber 38 in the rotor 30. Into each of '. The oil separation chamber 35 can simultaneously perform the separation of foreign matter in the oil and the bubble separation chamber 38 'can simultaneously separate the bubbles in the oil. The oil after the foreign matter is separated can be discharged to the outside through the oil discharge path 213, and the bubbles after being separated from the oil , that is, the gas, can be discharged to the gas discharge path 223 through separate flow paths. Therefore, the oil can be returned to the oil pan side of the internal combustion engine, and the gas can be sucked into the intake system of the internal combustion engine and recombusted. Thereby, oil can be cleaned efficiently.
[0034]
Further, the centrifugal separator 300 of the present embodiment is disposed concentrically so that the oil separation chamber 35 is located on the outer peripheral side of the bubble separation chamber 38 ′ with respect to the shaft member 220 in the rotor 30. As described above, since the oil separation chamber 35 is disposed on the outer peripheral side of the bubble separation chamber 38 ', the centrifugal force (jet power) generated by the oil ejection is effectively used, and foreign matters and bubbles in the oil can be separated efficiently. . Furthermore, since the oil separation chamber 35 and the bubble separation chamber 38 'are arranged concentrically, the physique in the axial direction can be shortened.
[0035]
In the centrifugal separator 300 of the present embodiment, the rotor 30 is rotated by the jet power of the oil jetted from the jet hole 36. Thus, since the rotor 30 is rotated by the jet output of the oil itself and does not require another driving force, separation and removal of foreign matters and the like by centrifugal force can be achieved with a very simple configuration.
[0036]
By the way, in the said Example, although the jet output of oil itself is utilized as a drive source for rotating the rotor 30, the drive force from the outside by an electric motor or an internal combustion engine can also be used together.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the flow of oil and blow-by gas in an internal combustion engine to which a centrifugal separator according to a first example of an embodiment of the present invention is applied.
FIG. 2 is a cross-sectional view showing an overall configuration of a centrifuge according to a first example of an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a first modified example in which an oil pump is disposed on the oil discharge path side of the centrifuge according to the first example of the embodiment of the present invention.
FIG. 4 is a sectional view showing a second modification in which an electric motor is attached to the rotor of the centrifuge according to the first example of the embodiment of the present invention.
FIG. 5 is a perspective view showing an overall configuration of a third modified example of the centrifuge according to the first example of the embodiment of the present invention.
6 is a cross-sectional view showing the main configuration of FIG. 5. FIG.
FIG. 7 is a cross-sectional view showing an overall configuration of a centrifuge according to a second example of the embodiment of the present invention.
[Explanation of symbols]
1 Internal combustion engine 1b Crankcase 2 Oil pan 10 Body (base)
11 Oil supply passage 13 Oil discharge passage 15 Blow-by gas introduction passage 18 Cover (cover member)
20 Shaft members 21, 22 Communication passage 23 Blow-by gas discharge passage 30 Rotor (rotor member)
35 Oil separation chamber 36 Ejection hole 38 Blow-by gas separation chamber 100 Centrifuge

Claims (2)

A supply path for supplying oil in an oil pan of the internal combustion engine, an introduction path for introducing blow-by gas in the crankcase of the internal combustion engine, and an oil discharge path for discharging oil after foreign matter is separated from the oil are formed. And a base to
Inserted into the base, connected to the supply path and the introduction path, respectively, the communication paths through which the oil and the blow-by gas pass, and the blow-by gas discharged after the oil and foreign matter are separated from the blow-by gas A shaft member that forms a blow-by gas discharge passage;
An oil separation chamber that is rotatably supported by the shaft member and separates foreign matter from the oil flowing in through the one communication passage of the shaft member, and flows in through the other communication passage of the shaft member. A blow-by gas separation chamber for separating oil and foreign matter from the blow-by gas, respectively, and the oil after the foreign matter is separated in the oil separation chamber from an ejection hole provided in a lower portion of the oil separation chamber. A rotor member that ejects the blow-by gas to the blow-by gas discharge path of the shaft member after the oil component and foreign matter are separated in the blow-by gas separation chamber,
A cover member that projects the blow-by gas discharge path of the shaft member to the outside, covers the outer periphery of the rotor member, and is coupled to the base ;
The oil separation chamber is disposed concentrically in the rotor member so as to be on the outer peripheral side of the blow-by gas separation chamber with respect to the shaft member. Separator. 2. The oil and blow-by gas centrifugal separator according to claim 1, wherein the rotor member is rotated by an ejection force of the oil ejected from the ejection hole .

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