WO2015187034A1 - Inlet valve for a cylinder in an combustion engine - Google Patents

Inlet valve for a cylinder in an combustion engine Download PDF

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Publication number
WO2015187034A1
WO2015187034A1 PCT/NO2015/050099 NO2015050099W WO2015187034A1 WO 2015187034 A1 WO2015187034 A1 WO 2015187034A1 NO 2015050099 W NO2015050099 W NO 2015050099W WO 2015187034 A1 WO2015187034 A1 WO 2015187034A1
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WIPO (PCT)
Prior art keywords
valve
valve seat
underside
ellipsoidal
separation point
Prior art date
Application number
PCT/NO2015/050099
Other languages
French (fr)
Inventor
Milan MILOVANOVIC
Original Assignee
Bergen Engines As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bergen Engines As filed Critical Bergen Engines As
Priority to EP15803927.1A priority Critical patent/EP3152416A4/en
Publication of WO2015187034A1 publication Critical patent/WO2015187034A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an inlet valve for a cylinder in an combustion engine, comprising an upper valve stem and a lower disk shaped valve seat with a linear and oblique outer seating surface, said valve seat being wider in cross section than the valve stem, and in where the valve seat and the valve stem are converging in a transition area between the two parts.
  • the main focus of the invention is to explore different valve geometries in order to increase mass flow into a cylinder of an engine, for a fixed geometry of inlet port. By increasing the mass inflow, it is possible to gain additional pressure in the cylinder, which is very beneficial.
  • the shape of the inlet valves has been changed. Briefly by that the bottom part of the valves are changed into ellipsoidal shape in order to push the separation point downstream and therefore gain increase of the mass flow into the cylinder of the combustion engine.
  • the center bottom part of the valve has been lowered in order to create ellipsoid, which has "smoother" geometry.
  • the main idea is drag reduction by passive geometry adjustment.
  • valves discloses in EP1643087A1 , US5081965A, US2012/0266840A1 , US4815706A, EP0024890A1 , FR2532360A1 , WO00/68565A, and US6263849B1 , and in where none of the documents disclose a valve seat comprising an ellipsoidal flow separation surface running downstream from an end of a seating surface to an underside of the valve seat.
  • the valve seat comprises an ellipsoidal flow separation surface running downstream from an end of the seating surface to an underside of the valve seat.
  • Alternative embodiments are given in the dependent claims.
  • a separation point for flowing medium passing the valve seat can be located on the ellipsoidal surface running to the underside of the valve seat.
  • a separation point for flowing medium passing the valve seat is located in a transition area between the ellipsoidal surface running to the underside of the valve seat and the underside of the valve seat.
  • the linear and oblique outer seating surface on the valve seat can be made of hardfaced material.
  • a distance D1 from a center axis of the valve to an end point of the linear and oblique outer seating surface on the valve seat can be greater than a distance d1 from the center axis to a separation point for flowing medium passing the valve seat on the ellipsoidal surface running to the underside of the valve seat.
  • a distance D2 from a center axis of the valve to a start point of the linear and oblique outer seating surface on the valve seat is greater than a distance d1 from the center axis to a separation point for flowing medium passing the valve seat on the ellipsoidal surface running to the underside of the valve seat.
  • the separation point for flowing medium passing the valve seat on the ellipsoidal surface running to the underside of the valve seat may be located, and fluctuate, between said distances D1 and D2.
  • the underside of the valve seat can be designed with an elliptical face, and in where a central part of the face is designed with a rectilinear face.
  • the underside of the valve seat may further comprise an upward directed cavity, in where the center of the cavity is located at the same axis as a center axis of the valve.
  • the upward directed cavity can, in cross section, be concave.
  • the ellipsoidal surface, in an area on the underside of the valve seat, may converge with a surface of the upward directed cavity.
  • the converging area between the ellipsoidal surface and the surface of the upward directed cavity can, in cross section, be convex.
  • the underside of the valve seat may alternative comprise a mainly linear face.
  • a topside of the valve seat, in an area downstream of the transition area between the valve stem and the valve seat, may comprises a face with an angle, compared to an horizontal axis, which is in a range between 10-15°, and more preferable
  • Figure 1 shows a regular valve according to prior art.
  • Figure 2 shows a first embodiment of a valve according to the invention.
  • Figure 3 -5 shows a second embodiment of the invention.
  • Figure 6 shows a segment of a valve seat according to the invention.
  • Figures 7 and 8 shows schematic a separation point for a flow, respective for a prior art valve and a valve according to the invention.
  • Figures 9 and 10 shows schematic a separation point for a flow, respective between two prior art valves and between two valves according to the invention.
  • the valves according to the invention can be used with any combustion engine, but are specifically being designed for use with a lean burn gas engine.
  • FIG 1 a regular prior art inlet valve 10, with an upper valve stem 12 and a lower disk shaped valve seat 14 with a linear and oblique outer seating surface 16.
  • the valve seat 14 is wider in cross section than the valve stem 12, and the valve seat 14 and the valve stem 12 are converging in a transition area 18 between the two parts.
  • the known valve 10 comprises further an outer edge or surface 20 on the disk shaped valve seat, in where the outer edge 20 is a straight edge parallel with a center 22 axis of the valve 10.
  • the underside 24 of the valve 10 is designed with a linear face, and which basically runs on the entire length of the underside.
  • FIG 2 is shown a first embodiment of an inlet valve 1 10 according to the invention.
  • the inlet valve 1 10 comprises, corresponding to the known valve, an upper valve stem 1 12 and a lower disk shaped valve seat 1 14 with a linear and oblique outer seating surface 1 16.
  • the valve seat 1 14 is wider in cross section than the valve stem 1 12, and the valve seat 1 14 and the valve stem 1 12 are converging in a transition area 1 18 between the two parts. However, the curvature of the transition area 1 18 may have a smaller radius, compared to the known valve.
  • the underside 124 of the valve 1 10 is mainly designed with a linear face.
  • the topside 1 14a of the valve seat 1 14 is preferable designed as flat as possible. For instance, the angle of the topside 1 14a, compared to a horizontal axis or plane, may be in a range of 10- 15°, and more preferable approximately 12° ⁇ 0,5°.
  • the outer arched face of the disk shaped valve seat 1 14 comprises an ellipsoidal flow separation surface 120 running downstream from an end 134b (figure 6) of the seating surface 1 16 to the underside 124 of the valve seat 1 14.
  • Using an ellipsoidal geometry on the outer surface 120 may also lower the underside of the valve 1 10 compared to known valves 10.
  • the height hi between the underside 124 and an end point of the linear and oblique outer seating surface 1 16 is greater than the corresponding height h2 of the known valve 10.
  • the height hi can be corresponding to h2+5mm.
  • a separation point 126 for flowing medium passing the valve seat 1 14 is preferable located on the ellipsoidal surface 120 running to the underside of the valve seat.
  • the separation point 126 may also be located in a transition area 132 between the ellipsoidal surface 120 running to the underside of the valve seat and the underside 124 of the valve seat.
  • the separation point will normally fluctuate and not be stationary.
  • a distance D1 from a center axis 122 of the valve to a end point 134b (fig. 6) of the linear and oblique outer seating surface 1 16 on the valve seat 1 14 is preferable greater than a distance d1 from the center axis 122 to the separation point 126 on the ellipsoidal surface 120 running to the underside 124 of the valve seat.
  • the distance d1 from the center axis 122 to the separation point 126 on the ellipsoidal surface 120 may be greater than a distance D2 from the center axis 122 of the valve to a start point 134a of the linear and oblique outer seating surface 1 16 on the valve seat 1 14.
  • the separation point 126 can thus be located on a forward part of the underside 124 of the valve, approximately beneath the linear and oblique outer seating surface 1 16 on the valve seat 1 14. However, it is also possible that the separation point is located further away from the center axis than the distance D1 , or closer to the center axis than the distance D2.
  • the separation point 126 is located at a distance d1 from the center axis 122 to the separation point 126 on the ellipsoidal surface 120 which is less than the distance D2 from the center axis 122 of the valve to the start point 134a of the linear and oblique outer seating surface 1 16 on the valve seat 1 14.
  • the separation point 126 can thus be located on a forward part of the underside 124 of the valve, but closer to the center axis 122 than the linear and oblique outer seating surface 1 16 on the valve seat 1 14.
  • FIG. 3-5 shows the second embodiment of a valve 1 10 according to the invention. Same reference numbers have been used for corresponding parts of the valve.
  • the second embodiment is similar to the first embodiment.
  • the second embodiment of an inlet valve 1 10 according to the invention comprises an upper valve stem 1 12 and a lower disk shaped valve seat 1 14 with a linear and oblique outer seating surface 1 16.
  • the valve seat 1 14 is wider in cross section than the valve stem 1 12, and the valve seat 1 14 and the valve stem 1 12 are converging in a transition area 1 18 between the two parts.
  • the outer circular face of the disk shaped valve seat 1 14 comprises an ellipsoidal flow separation surface 120 running downstream from an end 134b of the seating surface 1 16 to the underside 124 of the valve seat 1 14.
  • the underside 124 of the valve 1 10 may further comprise a cavity 130.
  • the cavity is preferable an upward directed cavity 130, and with the center of the cavity 130 located at the same axis as the center axis 122 of the valve 1 10.
  • the upward directed cavity 130 can, in cross section, be concave. By having a concave cavity 130 it is possible to push the separation point 126 even further downstream, compared with the simple ellipsoidal shape of the first embodiment of the invention. In that way it will be possible to gain even more mass flow.
  • the central bottom part of the valve 1 10 is cut out, in order to create the concave shape, which may push up vortexes into the valve cavity 130 and therefore shift the separation point even further under the valve. In this case the leading idea was also drag reduction by passive geometry adjustment.
  • the separation point 126 may therefore be located (and fluctuate) between an area downstream of the end 134b of the seating surface 1 16 and the cavity 130, and possible also on the face of the cavity.
  • the last column shows the mass flow increase in percentage for the new valve with ellipsoidal surface and basically linear surface on the underside of the valve, i.e. the first embodiment.
  • the new valve geometry has superior mass flow compared to a regular valve.
  • Percentage mass flow is increased for the new valve geometry.
  • the increased mass flow for the ellipsoidal shape is the direct consequence of the reduced drag and shifted separation point downstream. That shifting, of separation point, opens main outer flow and directly effect the total mass flow.
  • With the new valve design there will be areas behind the valve where vortex singularities are formed. Those areas are directly correlated with valves drag.
  • the last column shows the mass flow increase in percentage for the new valve with cavity, i.e. the second embodiment.
  • the new valve geometry with the cavity of the second embodiment has even better mass flow compared to a regular valve, and also compared to the first embodiment of the invention. Percentage mass flow is substantial increased for the new valve geometry with cavity.
  • the increased mass flow for the ellipsoidal shape is the direct consequence of the reduced drag and shifted separation point downstream. That shifting, of separation point, opens main outer flow and directly effect the total mass flow.
  • Figure 7 show schematic a separation point for a flow for a prior art valve, while figure 8 show the separation point for a valve according to the invention.
  • a cylinder wall 40 is shown on the right hand side of the figures.
  • the separation point for a regular valve is located basically at the end of the linear and oblique outer seating surface 16 on the valve seat 14, and upstream of the outer edge 20 on the disk shaped valve seat.
  • the separation point 126 close to the cylinder wall 40 is pushed downstream with the new geometry, and which opens main outer flow and takes effect on the total mass flow.
  • Figure 9 show schematic a separation point for a flow between two prior art valves in a cylinder
  • figure 10 show the separation points between two valves according to the invention.
  • the separation point for the regular valve is located on the outer edge 20 of the disk shaped valve seat.
  • the separation points between the new valves are pushed downstream with the new geometry, which opens main outer flow and takes effect on the total mass flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)

Abstract

Inlet valve (110) for a cylinder of an combustion engine, comprising an upper valve stem (112) and a lower disk shaped valve seat (114) with a linear and oblique outer seating surface (116), said valve seat (114) being wider in cross section than the valve stem (112), and in where the valve seat (114) and the valve stem (112) are converging in a transition area (118) between the two parts, wherein the valve seat (114) comprises an ellipsoidal flow separation surface (120) running downstream from an end of said seating surface (116) to an underside (124) of the valve seat (114).

Description

INLET VALVE FOR A CYLINDER IN AN COMBUSTION ENGINE
The present invention relates to an inlet valve for a cylinder in an combustion engine, comprising an upper valve stem and a lower disk shaped valve seat with a linear and oblique outer seating surface, said valve seat being wider in cross section than the valve stem, and in where the valve seat and the valve stem are converging in a transition area between the two parts.
The main focus of the invention is to explore different valve geometries in order to increase mass flow into a cylinder of an engine, for a fixed geometry of inlet port. By increasing the mass inflow, it is possible to gain additional pressure in the cylinder, which is very beneficial.
According to the invention, the shape of the inlet valves has been changed. Briefly by that the bottom part of the valves are changed into ellipsoidal shape in order to push the separation point downstream and therefore gain increase of the mass flow into the cylinder of the combustion engine. The center bottom part of the valve has been lowered in order to create ellipsoid, which has "smoother" geometry. The main idea is drag reduction by passive geometry adjustment.
From patent literature reference is made to valves discloses in EP1643087A1 , US5081965A, US2012/0266840A1 , US4815706A, EP0024890A1 , FR2532360A1 , WO00/68565A, and US6263849B1 , and in where none of the documents disclose a valve seat comprising an ellipsoidal flow separation surface running downstream from an end of a seating surface to an underside of the valve seat. The above objects are achieved with a valve according to the invention, in where the valve seat comprises an ellipsoidal flow separation surface running downstream from an end of the seating surface to an underside of the valve seat. Alternative embodiments are given in the dependent claims.
A separation point for flowing medium passing the valve seat can be located on the ellipsoidal surface running to the underside of the valve seat.
It is possible that a separation point for flowing medium passing the valve seat is located in a transition area between the ellipsoidal surface running to the underside of the valve seat and the underside of the valve seat.
The linear and oblique outer seating surface on the valve seat can be made of hardfaced material.
In one embodiment of the invention, a distance D1 from a center axis of the valve to an end point of the linear and oblique outer seating surface on the valve seat can be greater than a distance d1 from the center axis to a separation point for flowing medium passing the valve seat on the ellipsoidal surface running to the underside of the valve seat. In another embodiment it is possible that a distance D2 from a center axis of the valve to a start point of the linear and oblique outer seating surface on the valve seat is greater than a distance d1 from the center axis to a separation point for flowing medium passing the valve seat on the ellipsoidal surface running to the underside of the valve seat.
The separation point for flowing medium passing the valve seat on the ellipsoidal surface running to the underside of the valve seat may be located, and fluctuate, between said distances D1 and D2. The underside of the valve seat can be designed with an elliptical face, and in where a central part of the face is designed with a rectilinear face.
The underside of the valve seat may further comprise an upward directed cavity, in where the center of the cavity is located at the same axis as a center axis of the valve. The upward directed cavity can, in cross section, be concave. The ellipsoidal surface, in an area on the underside of the valve seat, may converge with a surface of the upward directed cavity.
The converging area between the ellipsoidal surface and the surface of the upward directed cavity can, in cross section, be convex.
The underside of the valve seat may alternative comprise a mainly linear face.
A topside of the valve seat, in an area downstream of the transition area between the valve stem and the valve seat, may comprises a face with an angle, compared to an horizontal axis, which is in a range between 10-15°, and more preferable
approximately 12° ± 0,5°.
The invention shall now further be explained, with the figures showing exemplary embodiments of the invention.
Figure 1 shows a regular valve according to prior art.
Figure 2 shows a first embodiment of a valve according to the invention.
Figure 3 -5 shows a second embodiment of the invention.
Figure 6 shows a segment of a valve seat according to the invention.
Figures 7 and 8 shows schematic a separation point for a flow, respective for a prior art valve and a valve according to the invention.
Figures 9 and 10 shows schematic a separation point for a flow, respective between two prior art valves and between two valves according to the invention. The valves according to the invention can be used with any combustion engine, but are specifically being designed for use with a lean burn gas engine.
In figure 1 is shown a regular prior art inlet valve 10, with an upper valve stem 12 and a lower disk shaped valve seat 14 with a linear and oblique outer seating surface 16. The valve seat 14 is wider in cross section than the valve stem 12, and the valve seat 14 and the valve stem 12 are converging in a transition area 18 between the two parts. The known valve 10 comprises further an outer edge or surface 20 on the disk shaped valve seat, in where the outer edge 20 is a straight edge parallel with a center 22 axis of the valve 10. The underside 24 of the valve 10 is designed with a linear face, and which basically runs on the entire length of the underside. In figure 2 is shown a first embodiment of an inlet valve 1 10 according to the invention. The inlet valve 1 10 comprises, corresponding to the known valve, an upper valve stem 1 12 and a lower disk shaped valve seat 1 14 with a linear and oblique outer seating surface 1 16. The valve seat 1 14 is wider in cross section than the valve stem 1 12, and the valve seat 1 14 and the valve stem 1 12 are converging in a transition area 1 18 between the two parts. However, the curvature of the transition area 1 18 may have a smaller radius, compared to the known valve. The underside 124 of the valve 1 10 is mainly designed with a linear face. The topside 1 14a of the valve seat 1 14 is preferable designed as flat as possible. For instance, the angle of the topside 1 14a, compared to a horizontal axis or plane, may be in a range of 10- 15°, and more preferable approximately 12° ± 0,5°.
The outer arched face of the disk shaped valve seat 1 14 comprises an ellipsoidal flow separation surface 120 running downstream from an end 134b (figure 6) of the seating surface 1 16 to the underside 124 of the valve seat 1 14. Using an ellipsoidal geometry on the outer surface 120 may also lower the underside of the valve 1 10 compared to known valves 10. As shown in figures 1 and 2, the height hi between the underside 124 and an end point of the linear and oblique outer seating surface 1 16 is greater than the corresponding height h2 of the known valve 10. In an example embodiment the height hi can be corresponding to h2+5mm. Thus, creating an ellipsoidal backend part of the valve, which has "smoother" geometry at the edge of the valve. Using an ellipsoidal shape will shift the separation point for flowing medium downstream and therefore gain increase of the mass flow. The flowing medium may be air or a mixture of gases.
As shown in figure 6, a separation point 126 for flowing medium passing the valve seat 1 14 is preferable located on the ellipsoidal surface 120 running to the underside of the valve seat. The separation point 126 may also be located in a transition area 132 between the ellipsoidal surface 120 running to the underside of the valve seat and the underside 124 of the valve seat. During use of the valve according to the invention, the separation point will normally fluctuate and not be stationary.
Thus, as shown in figure 2, a distance D1 from a center axis 122 of the valve to a end point 134b (fig. 6) of the linear and oblique outer seating surface 1 16 on the valve seat 1 14 is preferable greater than a distance d1 from the center axis 122 to the separation point 126 on the ellipsoidal surface 120 running to the underside 124 of the valve seat. The distance d1 from the center axis 122 to the separation point 126 on the ellipsoidal surface 120 may be greater than a distance D2 from the center axis 122 of the valve to a start point 134a of the linear and oblique outer seating surface 1 16 on the valve seat 1 14. The separation point 126 can thus be located on a forward part of the underside 124 of the valve, approximately beneath the linear and oblique outer seating surface 1 16 on the valve seat 1 14. However, it is also possible that the separation point is located further away from the center axis than the distance D1 , or closer to the center axis than the distance D2.
It is thus possible that the separation point 126 is located at a distance d1 from the center axis 122 to the separation point 126 on the ellipsoidal surface 120 which is less than the distance D2 from the center axis 122 of the valve to the start point 134a of the linear and oblique outer seating surface 1 16 on the valve seat 1 14. The separation point 126 can thus be located on a forward part of the underside 124 of the valve, but closer to the center axis 122 than the linear and oblique outer seating surface 1 16 on the valve seat 1 14.
The above location of the separation point 126 may apply for both the first and the second embodiment of the valve according to the invention. Figures 3-5 shows the second embodiment of a valve 1 10 according to the invention. Same reference numbers have been used for corresponding parts of the valve.
Except for the underside, the second embodiment is similar to the first embodiment. Thus, the second embodiment of an inlet valve 1 10 according to the invention comprises an upper valve stem 1 12 and a lower disk shaped valve seat 1 14 with a linear and oblique outer seating surface 1 16. The valve seat 1 14 is wider in cross section than the valve stem 1 12, and the valve seat 1 14 and the valve stem 1 12 are converging in a transition area 1 18 between the two parts. The outer circular face of the disk shaped valve seat 1 14 comprises an ellipsoidal flow separation surface 120 running downstream from an end 134b of the seating surface 1 16 to the underside 124 of the valve seat 1 14. As shown in the figures, the underside 124 of the valve 1 10 may further comprise a cavity 130.
The cavity is preferable an upward directed cavity 130, and with the center of the cavity 130 located at the same axis as the center axis 122 of the valve 1 10. The upward directed cavity 130 can, in cross section, be concave. By having a concave cavity 130 it is possible to push the separation point 126 even further downstream, compared with the simple ellipsoidal shape of the first embodiment of the invention. In that way it will be possible to gain even more mass flow. The central bottom part of the valve 1 10 is cut out, in order to create the concave shape, which may push up vortexes into the valve cavity 130 and therefore shift the separation point even further under the valve. In this case the leading idea was also drag reduction by passive geometry adjustment. The separation point 126 may therefore be located (and fluctuate) between an area downstream of the end 134b of the seating surface 1 16 and the cavity 130, and possible also on the face of the cavity.
The new valve design has been tested. In the test a pressure difference between input and output was set to 2451 Pa. For a bore size of 330mm and valve diameter 1 13mm, air mass flow through the inlet valves is presented in the following table in [kg/s], regarding the valve lifts for the two different valve geometries:
Figure imgf000008_0001
The last column shows the mass flow increase in percentage for the new valve with ellipsoidal surface and basically linear surface on the underside of the valve, i.e. the first embodiment.
The new valve geometry has superior mass flow compared to a regular valve.
Percentage mass flow is increased for the new valve geometry. The increased mass flow for the ellipsoidal shape is the direct consequence of the reduced drag and shifted separation point downstream. That shifting, of separation point, opens main outer flow and directly effect the total mass flow. With the new valve design there will be areas behind the valve where vortex singularities are formed. Those areas are directly correlated with valves drag.
Namely, bigger drag implies stronger vortexes behind the valves. In case the mass flow is increased on account of strength of the vortexes behind the valves, the strength of vortexes behind the valves will be decreased due to shifting of separation points, which is in accordance with drag reduction. Similar test has been performed for the new valve design with cavity. In the test a pressure difference between input and output was set to 2451 Pa.
With cavity
For bore size 330mm and valve diameter 1 13mm, air mass flow through the inlet valves is presented in the following table in [kg/s], regarding the valve lifts for the two different valve geometries:
Figure imgf000009_0001
The last column shows the mass flow increase in percentage for the new valve with cavity, i.e. the second embodiment.
The new valve geometry with the cavity of the second embodiment has even better mass flow compared to a regular valve, and also compared to the first embodiment of the invention. Percentage mass flow is substantial increased for the new valve geometry with cavity. The increased mass flow for the ellipsoidal shape is the direct consequence of the reduced drag and shifted separation point downstream. That shifting, of separation point, opens main outer flow and directly effect the total mass flow. Figure 7 show schematic a separation point for a flow for a prior art valve, while figure 8 show the separation point for a valve according to the invention. A cylinder wall 40 is shown on the right hand side of the figures. In this case the separation point for a regular valve is located basically at the end of the linear and oblique outer seating surface 16 on the valve seat 14, and upstream of the outer edge 20 on the disk shaped valve seat. As shown in figure 8 the separation point 126 close to the cylinder wall 40 is pushed downstream with the new geometry, and which opens main outer flow and takes effect on the total mass flow.
Figure 9 show schematic a separation point for a flow between two prior art valves in a cylinder, while figure 10 show the separation points between two valves according to the invention. In this case the separation point for the regular valve is located on the outer edge 20 of the disk shaped valve seat. As shown in figure 10 the separation points between the new valves are pushed downstream with the new geometry, which opens main outer flow and takes effect on the total mass flow.

Claims

Claims
1 . Inlet valve (1 10) for a cylinder of an combustion engine, comprising an upper valve stem (1 12) and a lower disk shaped valve seat (1 14) with a linear and oblique outer seating surface (1 16), said valve seat (1 14) being wider in cross section than the valve stem (1 12), and in where the valve seat (1 14) and the valve stem (1 12) are converging in a transition area (1 18) between the two parts, wherein
- the valve seat (1 14) comprises an ellipsoidal flow separation surface (120) running downstream from an end of said seating surface (1 16) to an underside (124) of the valve seat (1 14).
2. Valve according to claim 1 , wherein a separation point (126) for flowing medium passing the valve seat (1 14) is located on the ellipsoidal surface (120) running to the underside (124) of the valve seat (1 14).
3. Valve according to claim 1 , wherein a separation point (126) for flowing medium passing the valve seat (1 14) is located in a transition area (132) between the ellipsoidal surface (120) running to the underside (124) of the valve seat (1 14) and the underside (124) of the valve seat (1 14).
4. Valve according to claim 1 , wherein the linear and oblique outer seating surface (1 16) on the valve seat (1 14) is made of hardfaced material.
5. Valve according to claim 1 , wherein a distance (D1 ) from a center axis (122) of the valve (1 10) to an end point (134b) of the linear and oblique outer seating surface (1 16) on the valve seat (1 14) is greater than a distance (d1 ) from the center axis (122) to a separation point (126) for flowing medium passing the valve seat (1 14) on the ellipsoidal surface (120) running to the underside (124) of the valve seat (1 14).
6. Valve according to claim 1 , wherein a distance (D2) from a center axis (122) of the valve (1 10) to a start point (134a) of the linear and oblique outer seating surface (1 16) on the valve seat (1 14) is greater than a distance (d1 ) from the center axis (122) to a separation point (126) for flowing medium passing the valve seat (1 14) on the ellipsoidal surface (120) running to the underside (124) of the valve seat
7. Valve according to claim 5 and 6, wherein the separation point (126) for flowing medium passing the valve seat (1 14) on the ellipsoidal surface (120) running to the underside (124) of the valve seat (1 14) is located between said distances D1 and D2.
8. Valve according to claim 1 , wherein the underside (124) of the valve seat (1 14) is designed with an elliptical face, and in where a central part of the face is designed with a rectilinear face.
9. Valve according to claim 1 , wherein the underside (124) of the valve seat (1 14) comprises an upward directed cavity (130), in where the center of the cavity (130) is located at the same axis as a center axis (122) of the valve (1 10).
10. Valve according to claim 9, wherein the upward directed cavity (130), in cross section, is concave.
1 1 . Valve according to claim 10, wherein the ellipsoidal surface (120), in an area on the underside (124) of the valve seat (1 14), converges with a surface of the upward directed cavity (130).
12. Valve according to claim 1 1 , wherein the converging area between the ellipsoidal surface (120) and the surface of the upward directed cavity (130), in cross section, is convex.
13. Valve according to claim 1 , wherein the underside (124) of the valve seat (1 14) comprises a mainly linear face.
14. Valve according to claim 1 , wherein a topside (1 14a) of the valve seat (1 14), in an area downstream of a transition area (1 18) between the valve stem (1 12) and the valve seat (1 14), comprises an angled face, compared to an horizontal axis, which is in a range between 10-15°, and more preferable approximately 12° ± 0,5°.
PCT/NO2015/050099 2014-06-03 2015-06-03 Inlet valve for a cylinder in an combustion engine WO2015187034A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15803927.1A EP3152416A4 (en) 2014-06-03 2015-06-03 Inlet valve for a cylinder in an combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20140690A NO336985B1 (en) 2014-06-03 2014-06-03 Inlet valve for an engine
NO20140690 2014-06-03

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NO (1) NO336985B1 (en)
WO (1) WO2015187034A1 (en)

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Publication number Priority date Publication date Assignee Title
RU2656080C1 (en) * 2016-11-30 2018-05-30 Общество с ограниченной ответственностью "ФБТ" (ООО "ФБТ") Inlet valve of internal combustion engine
WO2021126476A1 (en) 2019-12-17 2021-06-24 Caterpillar Inc. Engine valve with raised ring or dimple
US11215092B2 (en) 2019-12-17 2022-01-04 Caterpillar Inc. Engine valve with raised ring or dimple
US11885246B2 (en) 2019-12-17 2024-01-30 Caterpillar Inc. Engine valve with raised ring or dimple

Also Published As

Publication number Publication date
EP3152416A4 (en) 2018-02-28
EP3152416A1 (en) 2017-04-12
NO336985B1 (en) 2015-12-14
NO20140690A1 (en) 2015-12-04

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