US20150059718A1 - Engine Crankcase Breathing Passage With Flow Diode - Google Patents
Engine Crankcase Breathing Passage With Flow Diode Download PDFInfo
- Publication number
- US20150059718A1 US20150059718A1 US14/015,456 US201314015456A US2015059718A1 US 20150059718 A1 US20150059718 A1 US 20150059718A1 US 201314015456 A US201314015456 A US 201314015456A US 2015059718 A1 US2015059718 A1 US 2015059718A1
- Authority
- US
- United States
- Prior art keywords
- flow
- diode
- drain
- crankcase
- breather
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000029058 respiratory gaseous exchange Effects 0.000 title description 4
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- 238000009423 ventilation Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 206010013975 Dyspnoeas Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M2013/0038—Layout of crankcase breathing systems
Definitions
- the present disclosure relates to flow control for crankcase draining and breathing of an internal combustion engine, and more specifically to the use of flow diodes in the crankcase drain and breather passageways for generating flow in the direction of intended oil drain back and/or direction of intended breather flow.
- blow-by gases typical include intake air, unburned fuel, exhaust gas, oil mist and/or water vapor. It is desirable to ventilate the crankcase and re-circulate the blow-by gases to the intake side of the engine for combustion to enhance performance and improve emissions.
- conventional systems may create pressure waves in the crankcase which excite natural resonant frequencies of the engine, in the crankcase cavity or PCV system.
- the interaction between the pressure waves and the engine components when driven at these resonant frequencies can reduce power output and generate unwanted noise and vibration from the engine. These interactions will also hinder oil drain back and cause higher oil pullover into the intake region.
- crankcase gases for improved drain back and breathing and generating directional flow while simultaneously reducing the pulsating (i.e., oscillating or unsteady) flow, as well as the crankcase pressure resonance.
- An internal combustion engine having a crankcase drain back system includes a set of drain lines defined by passageways providing fluid communication between the cylinder head and the crankcase of an engine block, and a set of breather lines defined by passageways extending between an upper region of a cylinder block and the cylinder head.
- a flow diode is disposed in the drain lines and oriented to provide a preferential flow in one direction from the cylinder head to the crankcase.
- Another flow diode is disposed in the breather lines and oriented to direct fluid flow in a direction from the cylinder block to the cylinder portion.
- crankcase drain back system improves oil drain back and overall lubrication and ventilation of the engine.
- crankcase drain back system reduces pressure pulsations within the interior volumes defined by the crank bays and cylinder heads, thereby reducing the excitation of resonant modes of the engine.
- Added benefits further include better draining of lubricant to the oil pan, reduced oil aeration, reduced oil-to-air mass fraction (oil mist), reduced oil pullover through the positive crankcase ventilation (PCV) valve, reduced oil migration up oil-drain passageways under high g-force handling maneuvers, and increased power output from the engine.
- the crankcase drain back system may be formed within existing structure and passageways of an engine block and without the use of any moving parts. Alternately, the crankcase drain back system may be formed as a separate, formed component which is inserted within an existing passageway or adapted as an external passageway or piping.
- FIG. 1 is a schematic illustration of an engine block assembly with flow diodes disposed in the drain and breather passageways;
- FIG. 2 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a first embodiment
- FIG. 3 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a second embodiment
- FIG. 4 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a third embodiment
- FIG. 5 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a fourth embodiment
- FIG. 6 is a plot showing the mass flow as a function of pressure drop across an exemplar flow diode
- FIG. 7 is a plot showing the average mass flow through the drain passageways as a function of engine speed
- FIG. 8 is a plot showing the maximum, mean and minimum velocity through the breather passageways as a function of engine speed
- FIG. 9 is a plot showing the maximum, mean and minimum velocity through the drain passageways as a function of engine speed.
- FIGS. 10A-10D are plots showing the pressure amplitude as a function of engine speed with and without flow diodes at Bays 1-4 respectively.
- Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope of this disclosure to those who are skilled in the art. Specific details may be set forth to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known structures, and well-known technologies are not described in detail.
- structure described as “below” or “beneath” other structure would then be oriented “above” the other structure without materially affecting its special relationship or operation.
- the structure may be otherwise oriented (e.g. rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
- an engine block assembly 10 is schematically illustrated and includes cylinder block 12 , an oil pan 14 secured on the bottom of the cylinder block 12 and a set of cylinder heads 16 secured on the top of the cylinder block 12 over a set of cylinder bores 18 formed therein which collectively are referred to as an engine block.
- a cover 20 is secured over each cylinder head 16 and form an enclosed volume 22 hereinafter referred to as the valve case that houses a portion of the valve train including the rockers (not shown).
- the cylinder block 12 and oil pan 14 form an enclosed volume 24 hereinafter referred to as the crankcase that houses the crankshaft (not shown).
- a set of breather lines 26 formed in the cylinder head 16 and the cylinder block 12 fluidly couple the valve case 22 with an upper portion of the crankcase 24 for ventilation thereof.
- a set of drain lines 28 formed in the cylinder head 16 and the cylinder block 12 fluidly couple the top of the cylinder head 16 and the crankcase 24 for draining oil from the valve case 22 to the crankcase 24 .
- the breather lines 26 and drain lines 28 illustrated in FIG. 1 are schematically represented as internal passageways formed within the structure of the engine block. However, one skilled in the art should appreciate that breather lines and drain lines may also be external passageways arranged on the exterior of the engine block which fluidly couple the enclosed volumes 22 , 24 defined thereby.
- Flow diodes 30 disposed in the breather lines 26 are oriented to promote flow in a direction from the crankcase 24 to the valve case 22 .
- Flow diodes 32 disposed in the drain lines 28 are oriented to promote flow in a direction from the valve case 22 to the crankcase 24 .
- the term “flow diode” refers to an element formed or disposed within a passageway that has a highly directional flow characteristic resulting in a pressure loss across the element in one direction which is much greater than the pressure loss across the element in the opposite direction as represented in the plot 600 shown in FIG. 6 .
- the characteristics of a given flow diode may be defined by a Q value.
- the Q value of a flow diode is defined as the ratio of fluid flow rate in one direction to the fluid flow rate in the opposite direction for a given pressure drop across the flow diode and a given fluid density.
- the Q values are for a given pressure drop of 10 kPa and air at ambient conditions.
- Each flow diode 30 , 32 has a Q value greater than 1.1 and preferably in the range of 1.5 to 5.0, as dictated by the overall pressure drop which maximizes the flow rate effect and minimizes the pressure drop in the forward or preferred direction, particularly in the high pressure range.
- flow diode 28 is a series of flow diode elements 30 . 1 - 30 . 6
- flow diode 32 is a series of flow diode elements 32 . 1 - 32 . 5 .
- These flow diode elements are disposed in a stacked relationship within the respective passageways to achieve the preferred Q value.
- These flow diode elements may be inserted into an engine block assembly having conventional breather and drain lines or may be integrally formed in the passageways.
- FIGS. 2-5 schematically illustrate various flow diode configurations suitable for use in the engine block assembly 10 .
- a flow diode 100 is illustrated as having a plurality of frusto-conical elements 102 to define tapered wall segments in the passageway 104 .
- Arrow A2 illustrates the direction of preferred flow.
- Each frusto-conical element 102 has an inlet 106 and an outlet 108 and a length 110 .
- the ratio of the cross-sectional area of inlet 106 to the cross-sectional area of outlet 108 is greater than 1:1 and as presently preferred is greater than or equal to 1.5:1.
- the length 110 of the flow diode element is greater than the effective diameter of the inlet 106 , wherein the effective diameter is the calculated as follows:
- An exemplary flow diode satisfying these criteria would include 7 flow diode elements, each having an inlet diameter of 24 mm, an outlet diameter of 16 mm and a length of 27.5 mm.
- Another exemplary flow diode satisfying these criteria would include 7 flow diode elements, each having an inlet diameter of 20 mm, and outlet diameter of 13 mm and a length of at least 20 mm. While the inlet and outlet may be readily determined for simple flow diode geometries such as that illustrated in FIG. 2 , this may be more difficult for more complex geometries.
- outlet is used to refer to the region of the flow diode having a maximum cross sectional area
- outlet is generally used to refer to a region of the flow diode having a minimum cross sectional area.
- cross sectional area refers to an area of the passageway which is perpendicular to the longitudinal axis of the passageway or in other words, the direction flow direction.
- a flow diode 200 is illustrated as having a plurality of cantilevered elements or fins 202 to define tapered wall segments extending into the passageway 204 .
- Arrow A3 illustrates the direction of preferred flow.
- An inlet 206 is defined at the root 208 of the cantilevered element 202
- an outlet 210 is define at the tip 212 of the cantilevered element 202
- a length 214 is defined by the distance from the root 208 to the tip 212 .
- the ratio of the cross-sectional area of inlet 206 to the cross-sectional area of outlet 210 is greater than 1:1 and as presently preferred is greater than or equal to 1.5:1.
- the length 214 of the cantilevered element 102 is greater than the effective diameter of the inlet 206 .
- a flow diode 300 is illustrated as having a plurality of heart-shaped elements 302 to define tapered wall segments in the passageway 304 .
- Arrow A4 illustrates the direction of preferred flow.
- Each heart-shaped element 302 includes a central channel 306 designated with dotted lines and a pair of eddy channels 308 laterally disposed of the central channel 306 .
- Each eddy channel 308 has an annular region 310 at the inlet 312 and a funnel region 314 extending from the annular region 310 to the outlet 316 .
- Each heart-shaped element 302 functions to create eddies and back flow in the passageway 304 when flow is opposite the direction of preferred flow.
- a flow diode 400 (also known as a Tesla valvular conduit, see U.S. Pat. No. 1,329,559 the disclosure of which is expressly incorporated by reference herein) is illustrated as having a plurality of diode segments 402 arranged on alternate sides of the passageway 404 .
- Arrow A5 illustrates the direction of preferred flow.
- Each diode segment 402 includes a channel 406 with a partition 408 formed in the channel 406 and inwardly angled in the direction of preferred flow. The each diode segment 402 functions to disturbed flow through the passageway 404 when it is opposite the direction of preferred flow.
- FIGS. 7-10D illustrate various engine parameters as a function of engine speed for comparing the performance of the improved drain back system with a conventional system using a computer-based simulation of a V-8 engine.
- FIG. 7 shows a plot 700 of the average mass flow rate (g/s) as a function of engine speed (rpm) with a positive mass flow rate indicating the direction of preferred flow toward the crankcase.
- the solid lines 702 . 1 - 702 . 4 represent the mass flow rate through the drain lines 28 in crank bays #1-#4 for a conventional system (breather lines and drain lines with a Q value of 1.0).
- the dashed lines 704 . 1 - 704 represent the mass flow rate through the drain lines 28 in crank bays #1-#4 for a conventional system (breather lines and drain lines with a Q value of 1.0).
- crank bays #1-#4 represent the mass flow rate through the drain lines 28 in crank bays #1-#4 for a first embodiment of the improved system (breather lines and drain lines including flow diodes with element having an inlet diameter of 24 mm, an outlet diameter of 16 mm and a Q value of 1.7).
- FIG. 8 shows a plot 800 of the flow velocity (m/s) through the breather line 26 as a function of engine speed with a positive velocity indicating the direction of preferred flow from the crankcase to the valve case.
- Curves 802 H , 802 L and 802 M (solid) represent the maximum, minimum and mean flow velocity through a conventional breather line.
- Curves 804 H , 804 L , 804 M (long dashed) represents the maximum, minimum and mean flow velocity through a breather line 26 including flow diodes with a Q value of 1.7.
- Curves 806 H , 806 L , 806 M (short dashed) represents the maximum, minimum and mean flow velocity through a breather line 26 including flow diodes with a Q value of 2.3.
- FIG. 9 shows a plot 900 of the flow velocity (m/s) through the drain line 28 as a function of engine speed (rpm) with a positive velocity indicating the direction of preferred flow from the valve case to the crankcase.
- Curves 902 H , 902 L and 902 M (solid) represent the maximum, minimum and mean flow velocity through a conventional drain line.
- Curves 904 H , 904 L , 904 M (long dashed) represents the maximum, minimum and mean flow velocity through a drain line 28 including flow diodes with a Q value of 1.7.
- Curves 906 H , 906 L , 906 M (short dashed) represents the maximum, minimum and mean flow velocity through a drain line 28 including flow diodes with a Q value of 2.3.
- the mean velocity curve 802 M , 902 M for the conventional system is less than or equal to zero indicating an average flow in opposition to the oil draining direction.
- the maximum and minimum velocity curves 802 H , 802 L , 902 H , 902 L in the drain and breather lines of the conventional system show velocities of up to ⁇ 55 m/s around 6000 rpm indicating a back-and-forth flow pattern which hampers proper oil draining and crankcase ventilation.
- the mean velocity curves 804 M , 806 M , 904 M , 906 M for the system with flow diodes is positive indicating an average flow in the oil draining direction.
- the maximum and minimum velocity curves 804 H , 804 L , 806 H , 806 L , 904 H , 904 L , 906 H , 906 L , in the drain and breather lines of the system with flow diodes show up to about 66% reduction in the velocities indicating a more stable flow pattern.
- FIGS. 10A-10D show plots 1000 , 1010 , 1020 , 1030 of the pressure amplitude (kPa) in the crankcase as a function of engine speed (rpm).
- the solid lines 1002 , 1012 , 1022 , 1032 represent the pressure amplitude in crankcase bays #1-#4 respectively in a conventional system.
- the short dashed lines 1004 , 1014 , 1024 , 1034 represent the pressure amplitude in crank bays #1-#4 respectively in a drain back system having flow diodes 30 , 32 including flow diodes with a Q value of 2.3 in the breather and drain lines 26 , 28 .
- crankcase drain back system may be tuned by modifying the Q values for flow diodes in the breather and drain lines associated with different crank bays depending on the mass flow and velocity profiles associated with the location of the drain and breather lines. Alternately, flow diodes could be used in less than all of the breather and drain lines.
- the flow diodes illustrated and described herein are a plurality of identical flow diode elements within a passageway.
- the improved system uses flow diode to direct air flow in a preferred direction using the pressure pulsations in the crankcase to create pumping action with no moving parts.
- the improved system has the additional benefit of reducing pressure amplitude resonances in the crankcase resulting in some gain at peak power.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
- The present disclosure relates to flow control for crankcase draining and breathing of an internal combustion engine, and more specifically to the use of flow diodes in the crankcase drain and breather passageways for generating flow in the direction of intended oil drain back and/or direction of intended breather flow.
- This section provides background information related to the present disclosure which is not necessarily prior art.
- Under certain operating conditions gases from the cylinders of an internal combustion engine get past the piston rings and leak into the engine crankcase. These blow-by gases typical include intake air, unburned fuel, exhaust gas, oil mist and/or water vapor. It is desirable to ventilate the crankcase and re-circulate the blow-by gases to the intake side of the engine for combustion to enhance performance and improve emissions.
- To this end, conventional engine blocks have a series of breathers that allow the blow-by gases to circulate from the crankcase to the inlet side of the engine and a series of drains that allow oil to drain from the top of the cylinder head to the crankcase. These passages are typically plain tubes or passages which flow equally in both directions. However, reciprocating engines often create a pulsating pressure differential in the crankcase which overrides the desired flow direction in the crankcase making drain back and breathing difficult to control. Generally, the average flow is against the oil flow direction due to the presence of blow-by gases. In addition, a pulsating flow due to piston movement generates significantly higher velocities than blow-by gases alone could achieve with flow velocities both with and against the oil drain direction, all within one engine revolution. Excessive oil may be retained in the valve covers and there is a highly likelihood that fine oil mist/droplets are created.
- In addition to affecting drain back and breathing, conventional systems may create pressure waves in the crankcase which excite natural resonant frequencies of the engine, in the crankcase cavity or PCV system. The interaction between the pressure waves and the engine components when driven at these resonant frequencies can reduce power output and generate unwanted noise and vibration from the engine. These interactions will also hinder oil drain back and cause higher oil pullover into the intake region.
- Accordingly, there is a need to develop a means for promoting directional flow of crankcase gases for improved drain back and breathing and generating directional flow while simultaneously reducing the pulsating (i.e., oscillating or unsteady) flow, as well as the crankcase pressure resonance.
- This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
- An internal combustion engine having a crankcase drain back system is disclosed. The system includes a set of drain lines defined by passageways providing fluid communication between the cylinder head and the crankcase of an engine block, and a set of breather lines defined by passageways extending between an upper region of a cylinder block and the cylinder head. A flow diode is disposed in the drain lines and oriented to provide a preferential flow in one direction from the cylinder head to the crankcase. Another flow diode is disposed in the breather lines and oriented to direct fluid flow in a direction from the cylinder block to the cylinder portion. These flow diodes use fluid flow created by the unsteady pressure pulsations in the crankcase bays to pump flow in a preferential direction. In other words, directional flow of crankcase gases and oil in the oil drain passageway is generated in a direction from the top of the engine block back down to the crankcase.
- As a result, the crankcase drain back system improves oil drain back and overall lubrication and ventilation of the engine. In addition, the crankcase drain back system reduces pressure pulsations within the interior volumes defined by the crank bays and cylinder heads, thereby reducing the excitation of resonant modes of the engine. Added benefits further include better draining of lubricant to the oil pan, reduced oil aeration, reduced oil-to-air mass fraction (oil mist), reduced oil pullover through the positive crankcase ventilation (PCV) valve, reduced oil migration up oil-drain passageways under high g-force handling maneuvers, and increased power output from the engine. The crankcase drain back system may be formed within existing structure and passageways of an engine block and without the use of any moving parts. Alternately, the crankcase drain back system may be formed as a separate, formed component which is inserted within an existing passageway or adapted as an external passageway or piping.
- Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
- The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
-
FIG. 1 is a schematic illustration of an engine block assembly with flow diodes disposed in the drain and breather passageways; -
FIG. 2 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a first embodiment; -
FIG. 3 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a second embodiment; -
FIG. 4 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a third embodiment; -
FIG. 5 is a cross-section showing a portion of a passageway having a series of stacked diode elements according to a fourth embodiment; -
FIG. 6 is a plot showing the mass flow as a function of pressure drop across an exemplar flow diode; -
FIG. 7 is a plot showing the average mass flow through the drain passageways as a function of engine speed; -
FIG. 8 is a plot showing the maximum, mean and minimum velocity through the breather passageways as a function of engine speed; -
FIG. 9 is a plot showing the maximum, mean and minimum velocity through the drain passageways as a function of engine speed; and -
FIGS. 10A-10D are plots showing the pressure amplitude as a function of engine speed with and without flow diodes at Bays 1-4 respectively. - Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
- Example embodiments will now be described more fully with reference to the accompanying drawings.
- Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope of this disclosure to those who are skilled in the art. Specific details may be set forth to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known structures, and well-known technologies are not described in detail.
- The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of recited structure(s) or step(s); for example, the stated features, integers, steps, operations, groups elements, and/or components, but do not preclude the presence or addition of additional structure(s) or step(s) thereof. The methods, steps, processes, and operations described herein are not to be construed as necessarily requiring performance in the stated or any particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional, alternative or equivalent steps may be employed.
- When structure is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” other structure, it may be directly or indirectly (i.e., via intervening structure) on, engaged, connected or coupled to the other structure. In contrast, when structure is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” the other structure, there may be no intervening structure present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent”). As used herein, the term “and/or” includes any and all combinations of one or more of the associated referenced items.
- Terms of degree (e.g., first, second, third) which are used herein to describe various structure or steps are not intended to be limiting. These terms are used to distinguish one structure or step from other structure or steps, and do not imply a sequence or order unless clearly indicated by the context of their usage. Thus, a first structure or step similarly may be termed a second structure or step without departing from the teachings of the example embodiments. Likewise, spatially relative terms (e.g., “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper”) which are used herein to describe the relative special relationship of one structure or step to other structure or step(s) may encompass orientations of the device or its operation that are different than depicted in the figures. For example, if a figure is turned over, structure described as “below” or “beneath” other structure would then be oriented “above” the other structure without materially affecting its special relationship or operation. The structure may be otherwise oriented (e.g. rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
- Referring now to
FIG. 1 anengine block assembly 10 is schematically illustrated and includescylinder block 12, anoil pan 14 secured on the bottom of thecylinder block 12 and a set ofcylinder heads 16 secured on the top of thecylinder block 12 over a set of cylinder bores 18 formed therein which collectively are referred to as an engine block. Acover 20 is secured over eachcylinder head 16 and form anenclosed volume 22 hereinafter referred to as the valve case that houses a portion of the valve train including the rockers (not shown). Thecylinder block 12 andoil pan 14 form anenclosed volume 24 hereinafter referred to as the crankcase that houses the crankshaft (not shown). A set ofbreather lines 26 formed in thecylinder head 16 and thecylinder block 12 fluidly couple thevalve case 22 with an upper portion of thecrankcase 24 for ventilation thereof. Similarly, a set ofdrain lines 28 formed in thecylinder head 16 and thecylinder block 12 fluidly couple the top of thecylinder head 16 and thecrankcase 24 for draining oil from thevalve case 22 to thecrankcase 24. The breather lines 26 anddrain lines 28 illustrated inFIG. 1 are schematically represented as internal passageways formed within the structure of the engine block. However, one skilled in the art should appreciate that breather lines and drain lines may also be external passageways arranged on the exterior of the engine block which fluidly couple theenclosed volumes -
Flow diodes 30 disposed in the breather lines 26 are oriented to promote flow in a direction from thecrankcase 24 to thevalve case 22.Flow diodes 32 disposed in thedrain lines 28 are oriented to promote flow in a direction from thevalve case 22 to thecrankcase 24. As used herein, the term “flow diode” refers to an element formed or disposed within a passageway that has a highly directional flow characteristic resulting in a pressure loss across the element in one direction which is much greater than the pressure loss across the element in the opposite direction as represented in theplot 600 shown inFIG. 6 . The characteristics of a given flow diode may be defined by a Q value. The Q value of a flow diode is defined as the ratio of fluid flow rate in one direction to the fluid flow rate in the opposite direction for a given pressure drop across the flow diode and a given fluid density. For purposes of the numeric ranges recited herein, the Q values are for a given pressure drop of 10 kPa and air at ambient conditions. - Each
flow diode flow diode 28 is a series of flow diode elements 30.1-30.6 and flowdiode 32 is a series of flow diode elements 32.1-32.5. These flow diode elements are disposed in a stacked relationship within the respective passageways to achieve the preferred Q value. These flow diode elements may be inserted into an engine block assembly having conventional breather and drain lines or may be integrally formed in the passageways.FIGS. 2-5 schematically illustrate various flow diode configurations suitable for use in theengine block assembly 10. - Referring now to
FIG. 2 , aflow diode 100 is illustrated as having a plurality of frusto-conical elements 102 to define tapered wall segments in thepassageway 104. Arrow A2 illustrates the direction of preferred flow. Each frusto-conical element 102 has aninlet 106 and anoutlet 108 and alength 110. The ratio of the cross-sectional area ofinlet 106 to the cross-sectional area ofoutlet 108, is greater than 1:1 and as presently preferred is greater than or equal to 1.5:1. As presently preferred, thelength 110 of the flow diode element is greater than the effective diameter of theinlet 106, wherein the effective diameter is the calculated as follows: -
- where
-
- deff=the effective diameter;
- A=cross-sectional area at the inlet; and
- P=perimeter at the inlet.
- An exemplary flow diode satisfying these criteria would include 7 flow diode elements, each having an inlet diameter of 24 mm, an outlet diameter of 16 mm and a length of 27.5 mm. Another exemplary flow diode satisfying these criteria would include 7 flow diode elements, each having an inlet diameter of 20 mm, and outlet diameter of 13 mm and a length of at least 20 mm. While the inlet and outlet may be readily determined for simple flow diode geometries such as that illustrated in
FIG. 2 , this may be more difficult for more complex geometries. Therefore, the term “inlet” is used to refer to the region of the flow diode having a maximum cross sectional area, and the term “outlet” is generally used to refer to a region of the flow diode having a minimum cross sectional area. The term “cross sectional area” refers to an area of the passageway which is perpendicular to the longitudinal axis of the passageway or in other words, the direction flow direction. - Referring now to
FIG. 3 , aflow diode 200 is illustrated as having a plurality of cantilevered elements orfins 202 to define tapered wall segments extending into thepassageway 204. Arrow A3 illustrates the direction of preferred flow. Aninlet 206 is defined at theroot 208 of the cantileveredelement 202, anoutlet 210 is define at thetip 212 of the cantileveredelement 202 and alength 214 is defined by the distance from theroot 208 to thetip 212. The ratio of the cross-sectional area ofinlet 206 to the cross-sectional area ofoutlet 210, is greater than 1:1 and as presently preferred is greater than or equal to 1.5:1. As presently preferred, thelength 214 of the cantileveredelement 102 is greater than the effective diameter of theinlet 206. - Referring now to
FIG. 4 , aflow diode 300 is illustrated as having a plurality of heart-shapedelements 302 to define tapered wall segments in thepassageway 304. Arrow A4 illustrates the direction of preferred flow. Each heart-shapedelement 302 includes acentral channel 306 designated with dotted lines and a pair ofeddy channels 308 laterally disposed of thecentral channel 306. Eacheddy channel 308 has anannular region 310 at theinlet 312 and afunnel region 314 extending from theannular region 310 to theoutlet 316. Each heart-shapedelement 302 functions to create eddies and back flow in thepassageway 304 when flow is opposite the direction of preferred flow. - Referring now to
FIG. 5 , a flow diode 400 (also known as a Tesla valvular conduit, see U.S. Pat. No. 1,329,559 the disclosure of which is expressly incorporated by reference herein) is illustrated as having a plurality ofdiode segments 402 arranged on alternate sides of thepassageway 404. Arrow A5 illustrates the direction of preferred flow. Eachdiode segment 402 includes achannel 406 with apartition 408 formed in thechannel 406 and inwardly angled in the direction of preferred flow. The eachdiode segment 402 functions to disturbed flow through thepassageway 404 when it is opposite the direction of preferred flow. -
FIGS. 7-10D illustrate various engine parameters as a function of engine speed for comparing the performance of the improved drain back system with a conventional system using a computer-based simulation of a V-8 engine.FIG. 7 shows aplot 700 of the average mass flow rate (g/s) as a function of engine speed (rpm) with a positive mass flow rate indicating the direction of preferred flow toward the crankcase. The solid lines 702.1-702.4 represent the mass flow rate through thedrain lines 28 in crank bays #1-#4 for a conventional system (breather lines and drain lines with a Q value of 1.0). The dashed lines 704.1-704.4 represent the mass flow rate through thedrain lines 28 in crank bays #1-#4 for a first embodiment of the improved system (breather lines and drain lines including flow diodes with element having an inlet diameter of 24 mm, an outlet diameter of 16 mm and a Q value of 1.7). - It will be noted that the average mass flow rate through most of the operating range (<8000 rpm) of the conventional system (curves 702.1-702.4) is negative, or in other words against the oil draining direction. In contrast, the average mass flow rate through the same operating range for the embodiment of the improved system (curves 704.1-704.4) are positive or in the oil draining direction.
-
FIG. 8 shows aplot 800 of the flow velocity (m/s) through thebreather line 26 as a function of engine speed with a positive velocity indicating the direction of preferred flow from the crankcase to the valve case. Curves 802 H, 802 L and 802 M (solid) represent the maximum, minimum and mean flow velocity through a conventional breather line. Curves 804 H, 804 L, 804 M (long dashed) represents the maximum, minimum and mean flow velocity through abreather line 26 including flow diodes with a Q value of 1.7. Curves 806 H, 806 L, 806 M (short dashed) represents the maximum, minimum and mean flow velocity through abreather line 26 including flow diodes with a Q value of 2.3. -
FIG. 9 shows aplot 900 of the flow velocity (m/s) through thedrain line 28 as a function of engine speed (rpm) with a positive velocity indicating the direction of preferred flow from the valve case to the crankcase. Curves 902 H, 902 L and 902 M (solid) represent the maximum, minimum and mean flow velocity through a conventional drain line. Curves 904 H, 904 L, 904 M (long dashed) represents the maximum, minimum and mean flow velocity through adrain line 28 including flow diodes with a Q value of 1.7. Curves 906 H, 906 L, 906 M (short dashed) represents the maximum, minimum and mean flow velocity through adrain line 28 including flow diodes with a Q value of 2.3. - It should be noted that the mean velocity curve 802 M, 902 M for the conventional system is less than or equal to zero indicating an average flow in opposition to the oil draining direction. Furthermore, the maximum and minimum velocity curves 802 H, 802 L, 902 H, 902 L in the drain and breather lines of the conventional system show velocities of up to ±55 m/s around 6000 rpm indicating a back-and-forth flow pattern which hampers proper oil draining and crankcase ventilation. By comparison, the mean velocity curves 804 M, 806 M, 904 M, 906 M for the system with flow diodes is positive indicating an average flow in the oil draining direction. In addition, the maximum and minimum velocity curves 804 H, 804 L, 806 H, 806 L, 904 H, 904 L, 906 H, 906 L, in the drain and breather lines of the system with flow diodes show up to about 66% reduction in the velocities indicating a more stable flow pattern.
-
FIGS. 10A- 10D show plots solid lines lines flow diodes drain lines flow diodes - While specific flow diodes are illustrated and described herein, one skilled in the art should appreciate that other flow diodes may be used in a crankcase drain back system without departing from the spirit and scope of the disclosure and claims set forth herein. To wit, the crankcase drain back system may be tuned by modifying the Q values for flow diodes in the breather and drain lines associated with different crank bays depending on the mass flow and velocity profiles associated with the location of the drain and breather lines. Alternately, flow diodes could be used in less than all of the breather and drain lines. Likewise, the flow diodes illustrated and described herein are a plurality of identical flow diode elements within a passageway. The present disclosure should be understood to encompass other flow diode configuration in which the flow diode elements arranged in a passageway are not identical in their geometry and/or Q values. In summary, the improved system uses flow diode to direct air flow in a preferred direction using the pressure pulsations in the crankcase to create pumping action with no moving parts. The improved system has the additional benefit of reducing pressure amplitude resonances in the crankcase resulting in some gain at peak power.
- The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Claims (20)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/015,456 US20150059718A1 (en) | 2013-08-30 | 2013-08-30 | Engine Crankcase Breathing Passage With Flow Diode |
DE102014111963.0A DE102014111963A1 (en) | 2013-08-30 | 2014-08-21 | Vent passage with flow diode for an engine crankcase |
CN201410434115.1A CN104420936B (en) | 2013-08-30 | 2014-08-29 | Engine crankcase venting channels with fluid diode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/015,456 US20150059718A1 (en) | 2013-08-30 | 2013-08-30 | Engine Crankcase Breathing Passage With Flow Diode |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150059718A1 true US20150059718A1 (en) | 2015-03-05 |
Family
ID=52470595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/015,456 Abandoned US20150059718A1 (en) | 2013-08-30 | 2013-08-30 | Engine Crankcase Breathing Passage With Flow Diode |
Country Status (3)
Country | Link |
---|---|
US (1) | US20150059718A1 (en) |
CN (1) | CN104420936B (en) |
DE (1) | DE102014111963A1 (en) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120070790A1 (en) * | 2010-09-22 | 2012-03-22 | US Gov't Represented by the Secretary of the Navy Office of Naval Research (ONR/NRL) Code OOCCIP | Apparatus methods and systems of unidirectional propagation of gaseous detonations |
US20170162280A1 (en) * | 2015-12-07 | 2017-06-08 | Ge-Hitachi Nuclear Energy Americas Llc | Piping enhancement for backflow prevention in a multiple loop, metal cooled nuclear reactor system |
WO2017152043A1 (en) * | 2016-03-03 | 2017-09-08 | Dayco IP Holding, LLC | Fluidic diode check valve |
WO2019011910A1 (en) * | 2017-07-12 | 2019-01-17 | Montaplast Gmbh | Cylinder head oil separator for an internal combustion engine (flow-controlled oil separator) |
US10465629B2 (en) | 2017-03-30 | 2019-11-05 | Quest Engines, LLC | Internal combustion engine having piston with deflector channels and complementary cylinder head |
US10526953B2 (en) | 2017-03-30 | 2020-01-07 | Quest Engines, LLC | Internal combustion engine |
US10590813B2 (en) | 2017-03-30 | 2020-03-17 | Quest Engines, LLC | Internal combustion engine |
US10590834B2 (en) | 2017-03-30 | 2020-03-17 | Quest Engines, LLC | Internal combustion engine |
US10598285B2 (en) | 2017-03-30 | 2020-03-24 | Quest Engines, LLC | Piston sealing system |
US10724428B2 (en) | 2017-04-28 | 2020-07-28 | Quest Engines, LLC | Variable volume chamber device |
US10753267B2 (en) | 2018-01-26 | 2020-08-25 | Quest Engines, LLC | Method and apparatus for producing stratified streams |
US10753308B2 (en) | 2017-03-30 | 2020-08-25 | Quest Engines, LLC | Internal combustion engine |
US10808866B2 (en) * | 2017-09-29 | 2020-10-20 | Quest Engines, LLC | Apparatus and methods for controlling the movement of matter |
US10883498B2 (en) | 2017-05-04 | 2021-01-05 | Quest Engines, LLC | Variable volume chamber for interaction with a fluid |
US10989138B2 (en) | 2017-03-30 | 2021-04-27 | Quest Engines, LLC | Internal combustion engine |
US11041456B2 (en) | 2017-03-30 | 2021-06-22 | Quest Engines, LLC | Internal combustion engine |
US11134335B2 (en) | 2018-01-26 | 2021-09-28 | Quest Engines, LLC | Audio source waveguide |
CN113464845A (en) * | 2021-07-13 | 2021-10-01 | 清华大学 | Gas circuit assembly and surge suppression system |
CN113482807A (en) * | 2021-07-15 | 2021-10-08 | 东风商用车有限公司 | Backflow-preventing EGR (exhaust gas Recirculation) outlet pipe and engine EGR system |
CN113478899A (en) * | 2021-07-30 | 2021-10-08 | 宜兴市惠众环保设备有限公司 | Screw press of waste residue is squeezed to unpowered secondary |
US20220195963A1 (en) * | 2020-12-17 | 2022-06-23 | Purdue Research Foundation | Injection manifold with tesla valves for rotating detonation engines |
US20220412291A1 (en) * | 2021-06-26 | 2022-12-29 | Pla Air Force Engineering Universit | Anti-back-transfer intake structure for rotating detonation combustion chamber |
US11767863B1 (en) | 2021-09-22 | 2023-09-26 | Joshua Jordan Mathis | Orbicular valvular conduit |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2598125C1 (en) * | 2015-07-16 | 2016-09-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Омский государственный технический университет" | Hydraulic and pneumatic once-through diode |
RU2718196C1 (en) * | 2019-10-08 | 2020-03-31 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет"(ОмГТУ) | Hydropneumatic diode with looped movement of working medium |
CN112901475A (en) * | 2021-02-23 | 2021-06-04 | 浙江赛克思液压有限公司 | Spiral vortex resistance energy dissipation structure and valve plate with same |
RU2767223C1 (en) * | 2021-07-30 | 2022-03-16 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет"(ОмГТУ) | Hydraulic distributor |
DE102021208623A1 (en) * | 2021-08-08 | 2023-02-09 | Psa Automobiles Sa | Secondary air line for an exhaust system of an internal combustion engine, having diode valve loops |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7905319B2 (en) * | 2008-06-11 | 2011-03-15 | Sullivan John T | Venturi muffler |
US8511291B2 (en) * | 2007-02-28 | 2013-08-20 | Toyota Jidosha Kabushiki Kaisha | Positive crankcase ventilation system, cylinder head used for positive crankcase ventilation system, internal combustion engine including positive crankcase ventilation system, and positive crankcase ventilation method |
US9169855B1 (en) * | 2012-05-18 | 2015-10-27 | The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration | Flow diode and method for controlling fluid flow origin of the invention |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1329559A (en) | 1916-02-21 | 1920-02-03 | Tesla Nikola | Valvular conduit |
DE29917548U1 (en) * | 1999-10-05 | 2000-01-05 | Armand Gunter | Multi-flow flow device |
DE10251947A1 (en) * | 2002-11-08 | 2004-05-19 | Robert Bosch Gmbh | Device to separate fluid esp. oil from a gas flow in crankcase of IC engines has distribution valve controlling separator elements dependent upon flow volume |
US7849841B2 (en) * | 2007-07-26 | 2010-12-14 | Cummins Filtration Ip, Inc. | Crankcase ventilation system with engine driven pumped scavenged oil |
US8118013B2 (en) * | 2008-09-24 | 2012-02-21 | GM Global Technology Operations LLC | Resonator and crankcase ventilation system for internal combustion engine |
JP5667366B2 (en) * | 2010-02-12 | 2015-02-12 | 本田技研工業株式会社 | Crankcase structure of internal combustion engine |
US8602008B2 (en) * | 2011-11-04 | 2013-12-10 | GM Global Technology Operations LLC | Positive crankcase ventilation system |
-
2013
- 2013-08-30 US US14/015,456 patent/US20150059718A1/en not_active Abandoned
-
2014
- 2014-08-21 DE DE102014111963.0A patent/DE102014111963A1/en not_active Withdrawn
- 2014-08-29 CN CN201410434115.1A patent/CN104420936B/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8511291B2 (en) * | 2007-02-28 | 2013-08-20 | Toyota Jidosha Kabushiki Kaisha | Positive crankcase ventilation system, cylinder head used for positive crankcase ventilation system, internal combustion engine including positive crankcase ventilation system, and positive crankcase ventilation method |
US7905319B2 (en) * | 2008-06-11 | 2011-03-15 | Sullivan John T | Venturi muffler |
US9169855B1 (en) * | 2012-05-18 | 2015-10-27 | The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration | Flow diode and method for controlling fluid flow origin of the invention |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120070790A1 (en) * | 2010-09-22 | 2012-03-22 | US Gov't Represented by the Secretary of the Navy Office of Naval Research (ONR/NRL) Code OOCCIP | Apparatus methods and systems of unidirectional propagation of gaseous detonations |
US9719678B2 (en) * | 2010-09-22 | 2017-08-01 | The United States Of America, As Represented By The Secretary Of The Navy | Apparatus methods and systems of unidirectional propagation of gaseous detonations |
US20170162280A1 (en) * | 2015-12-07 | 2017-06-08 | Ge-Hitachi Nuclear Energy Americas Llc | Piping enhancement for backflow prevention in a multiple loop, metal cooled nuclear reactor system |
US11978565B2 (en) * | 2015-12-07 | 2024-05-07 | Ge-Hitachi Nuclear Energy Americas Llc | Piping enhancement for backflow prevention in a multiple loop, metal cooled nuclear reactor system |
US10354763B2 (en) * | 2015-12-07 | 2019-07-16 | Ge-Hitachi Nuclear Energy Americas Llc | Piping enhancement for backflow prevention in a multiple loop, metal cooled nuclear reactor system |
US20190333652A1 (en) * | 2015-12-07 | 2019-10-31 | Ge-Hitachi Nuclear Energy Americas Llc | Piping enhancement for backflow prevention in a multiple loop, metal cooled nuclear reactor system |
WO2017152043A1 (en) * | 2016-03-03 | 2017-09-08 | Dayco IP Holding, LLC | Fluidic diode check valve |
US9915362B2 (en) | 2016-03-03 | 2018-03-13 | Dayco Ip Holdings, Llc | Fluidic diode check valve |
KR20180121881A (en) * | 2016-03-03 | 2018-11-09 | 데이코 아이피 홀딩스 엘엘시 | Diode check valve for fluid |
KR102258253B1 (en) | 2016-03-03 | 2021-05-28 | 데이코 아이피 홀딩스 엘엘시 | Diode check valve for fluid |
US10526953B2 (en) | 2017-03-30 | 2020-01-07 | Quest Engines, LLC | Internal combustion engine |
US10590813B2 (en) | 2017-03-30 | 2020-03-17 | Quest Engines, LLC | Internal combustion engine |
US10590834B2 (en) | 2017-03-30 | 2020-03-17 | Quest Engines, LLC | Internal combustion engine |
US10598285B2 (en) | 2017-03-30 | 2020-03-24 | Quest Engines, LLC | Piston sealing system |
US10989138B2 (en) | 2017-03-30 | 2021-04-27 | Quest Engines, LLC | Internal combustion engine |
US11041456B2 (en) | 2017-03-30 | 2021-06-22 | Quest Engines, LLC | Internal combustion engine |
US10753308B2 (en) | 2017-03-30 | 2020-08-25 | Quest Engines, LLC | Internal combustion engine |
US10465629B2 (en) | 2017-03-30 | 2019-11-05 | Quest Engines, LLC | Internal combustion engine having piston with deflector channels and complementary cylinder head |
US10724428B2 (en) | 2017-04-28 | 2020-07-28 | Quest Engines, LLC | Variable volume chamber device |
US10883498B2 (en) | 2017-05-04 | 2021-01-05 | Quest Engines, LLC | Variable volume chamber for interaction with a fluid |
US11111831B2 (en) | 2017-07-12 | 2021-09-07 | Montaplast Gmbh | Cylinder head oil separator for an internal combustion engine (flow-controlled oil separator) |
CN111051657A (en) * | 2017-07-12 | 2020-04-21 | 梦达驰德国有限公司 | Cylinder head oil separator for internal combustion engine (flow controlled oil separator) |
WO2019011910A1 (en) * | 2017-07-12 | 2019-01-17 | Montaplast Gmbh | Cylinder head oil separator for an internal combustion engine (flow-controlled oil separator) |
US11060636B2 (en) | 2017-09-29 | 2021-07-13 | Quest Engines, LLC | Engines and pumps with motionless one-way valve |
US10808866B2 (en) * | 2017-09-29 | 2020-10-20 | Quest Engines, LLC | Apparatus and methods for controlling the movement of matter |
US10753267B2 (en) | 2018-01-26 | 2020-08-25 | Quest Engines, LLC | Method and apparatus for producing stratified streams |
US11134335B2 (en) | 2018-01-26 | 2021-09-28 | Quest Engines, LLC | Audio source waveguide |
US20220195963A1 (en) * | 2020-12-17 | 2022-06-23 | Purdue Research Foundation | Injection manifold with tesla valves for rotating detonation engines |
US11767979B2 (en) * | 2020-12-17 | 2023-09-26 | Purdue Research Foundation | Injection manifold with tesla valves for rotating detonation engines |
US20220412291A1 (en) * | 2021-06-26 | 2022-12-29 | Pla Air Force Engineering Universit | Anti-back-transfer intake structure for rotating detonation combustion chamber |
CN113464845A (en) * | 2021-07-13 | 2021-10-01 | 清华大学 | Gas circuit assembly and surge suppression system |
CN113482807A (en) * | 2021-07-15 | 2021-10-08 | 东风商用车有限公司 | Backflow-preventing EGR (exhaust gas Recirculation) outlet pipe and engine EGR system |
CN113478899A (en) * | 2021-07-30 | 2021-10-08 | 宜兴市惠众环保设备有限公司 | Screw press of waste residue is squeezed to unpowered secondary |
US11767863B1 (en) | 2021-09-22 | 2023-09-26 | Joshua Jordan Mathis | Orbicular valvular conduit |
Also Published As
Publication number | Publication date |
---|---|
CN104420936A (en) | 2015-03-18 |
CN104420936B (en) | 2018-01-19 |
DE102014111963A1 (en) | 2015-03-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20150059718A1 (en) | Engine Crankcase Breathing Passage With Flow Diode | |
US10881996B2 (en) | Swirling flow generator for gas-liquid separation | |
US8408190B2 (en) | Air-oil separator for extracting oil from engine blowby gas | |
JP6765260B2 (en) | Blow-by gas processing device for internal combustion engine with supercharger | |
JP5478399B2 (en) | Engine blow-by gas recirculation system | |
US8602159B2 (en) | Compact muffler for small two-stroke internal combustion engines | |
US9217343B2 (en) | Dual flow check valve for positive crankcase ventilation system | |
US8663370B2 (en) | Breather for crankcase ventilation system | |
US20160032819A1 (en) | Reciprocating Internal Combustion Engine | |
KR101338280B1 (en) | A multiple diffuser for a reciprocating piston combustion engine, and a reciprocating piston combustion engine | |
KR20170097081A (en) | Air pipe for an intake tract of an internal combustion engine, in particular of a motor vehicle | |
CN107075994A (en) | Exhaust aftertreatment device and method for exhaust after-treatment | |
JP2011074900A (en) | Oil separation device of engine | |
US20130104817A1 (en) | Engine assembly including crankcase ventilation system | |
US9562450B1 (en) | Marine muffler with pulse attenuation tuning | |
US10718241B2 (en) | Engine housing component | |
JP2017129031A (en) | Intake manifold and engine having the same | |
CN106640663B (en) | Turn the air suction structure of the cylinder piston compressor and turns the cylinder piston compressor | |
US7032555B2 (en) | Motorcycle engine cam cover | |
JP2019199848A (en) | Intake device of internal combustion engine | |
US9359925B2 (en) | Oil separator in a positive crankcase ventilation system of an engine | |
CN216157775U (en) | Engine ventilation system and vehicle | |
EP2960464A1 (en) | Cooling device of supercharger of internal combustion engine comprising blow-by gas circulation device | |
RU53383U1 (en) | MIXER FOR CASTER GASES OF INTERNAL COMBUSTION ENGINE | |
JP2006063803A (en) | Engine crankcase emission control system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CLAYWELL, MARK R.;PRYOR, BRYAN K.;REEL/FRAME:031120/0335 Effective date: 20130828 |
|
AS | Assignment |
Owner name: WILMINGTON TRUST COMPANY, DELAWARE Free format text: SECURITY INTEREST;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS LLC;REEL/FRAME:033135/0440 Effective date: 20101027 |
|
AS | Assignment |
Owner name: GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:WILMINGTON TRUST COMPANY;REEL/FRAME:034189/0065 Effective date: 20141017 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION |