Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/65—Constructional details of EGR valves
  • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
  • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
  • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
  • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
  • F16K1/221—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves specially adapted operating means therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
  • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
  • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
  • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
  • F16K1/222—Shaping of the valve member

Definitions

• the invention relates to a valve for a motor vehicle engine, and more particularly to a recirculated exhaust gas valve.
• the current architecture reaches its limits with regard to the amount of exhaust gas that can be recycled.
• a recycling device to the low pressure part of the exhaust pipe, that is to say downstream of the gas expansion zone. exhaust, for directing a more substantial portion of the exhaust gas to the intake circuit of the engine.
• valve mounted on the low pressure portion of the exhaust pipe for directing the exhaust gas to the outside or to the recycling device and comprising a flap, a drive shaft of the flap and an actuating motor and transmission means configured to transmit the movement of the motor to the shaft.
• the assembly of the shaft on the body of the valve is performed with games, allowing its rotation.
• Such games allow a quantity of exhaust gas to flow through the valve towards the transmission and actuation members employed.
• gases being liable to damage the drive members, in particular by condensing, a seal is inserted along the shaft to block these gases.
• the flap and the shaft are fitted into each other at one or more connecting barrels which establishes a thermal conduction zone between the flap and the shaft.
• the flap is exposed directly to the exhaust gases and conducts the heat to the shaft through the barrel or barrels.
• valve has a compact structure and collected on the exhaust manifold to limit its bulk. In such a structure, the length of the drive shaft of the flap is necessarily limited which makes it difficult to cool the valve along it.
• the object of the invention is to solve at least part of these disadvantages.
• a gas valve in particular recirculated exhaust gas for motor vehicle engine, comprising a flap and a drive shaft of the flap about an axis of rotation, said flap and said shaft being sheathed one into the other at one or more connecting barrels establishing a heat conduction zone between the flap and the shaft, the valve comprising at least one cavity, in particular a cavity, configured so as to locate the zone thermal conduction axially recessed from a first edge of the flap facing an axial end of the shaft connected to the drive members of the valve.
• the cavity thus formed makes it possible to reduce the temperature reached at the joint by moving the central temperature point toward the flap. This allows in particular to use a conventional type of seal, for example rubber, not expensive, without having to lengthen the tree.
• the cavity is located between the shaft and the flap, in particular radially.
• the annular space extends axially from a passage through which the shaft enters a body of the valve.
• the cavity is delimited by an annular space formed in a side wall of the shaft.
• the diameter of the shaft is lower in its portion located at the level of the annular space.
• the diameter of the shaft is identical on both sides of said annular space.
• the flap has a radial offset relative to the axis of rotation. It can then be configured to make a thermal screen for the shaft relative to the flow of gas in the valve.
• the connecting barrel or that of the connecting barrels near the first edge is axially set back from said first edge.
• one or more additional cavities may be provided, for example an additional cavity formed in the side wall of the shaft and / or in the wall of the barrel.
• the cavity formed by the axial withdrawal of the barrel near the first edge of the flap and one or more other cavities formed in the shaft and / or in the barrel.
• said valve further comprises a second remote connection barrel of the barrel provided near the first edge.
• the additional cavity or cavities may be provided at this second barrel.
• the flap is aligned with the axis of rotation.
• the barrel is exposed directly to the exhaust gas and conducts the heat received to the drive shaft.
• the flap comprises two wings integral with the drum or drums and mounted symmetrically on either side of the drum or barrels with respect to said axis of rotation. It is meant here that the axis of rotation is substantially in the median plane defined by the wings.
• the flap has a thickness less than the diameter of the connecting barrel or barrels.
• the cavity is formed between the shaft and the shaft so as to dissipate heat and thus reduce the conduction of heat along the shaft.
• the cavity is delimited by an annular space formed in a side wall of the shaft, as in one of the variants associated with the flap having a radial offset.
• the cavity is delimited by an annular space in the barrel or that of the barrels near the first edge.
• the drive shaft is then of constant section as it may be the case for valves provided with a radial offset flap and connecting barrel axially set back from the first edge.
• the cavity is formed both in the shaft and in the shaft.
• the shaft is preferably substantially cylindrical.
• the shaft may be of circular, rectangular, square or other section, in one piece or in the form of a set of parts such as a plurality of shafts mounted with each other or stems etc. .
• the connecting barrel or barrels are made from the component material.
• Figure 1 illustrates in perspective a flap off-axis with respect to its axis of rotation.
• Figure 2 illustrates in perspective, partially, a valve provided with the shutter of Figure 1, in the open position.
• Figure 3 is a longitudinal sectional view, at the drive shaft of the valve of Figure 2, in the closed position.
• Figure 4 is a view similar to that of Figure 3 according to a first embodiment of the invention.
• Figure 5 is a view similar to that of Figure 3 according to a second embodiment of the invention.
• Figure 6 is a view similar to that of Figure 3 according to a third embodiment of the invention.
• Figure 7 illustrates in perspective a partial schematic view of a flap comprising a shaft and two wings, mounted symmetrically on the shaft and diametrically secured to a drive shaft.
• FIG. 8 illustrates a cross-sectional view of a valve comprising a shutter according to FIG. 7, in the closed position.
• Figure 9 is a longitudinal sectional view of the valve of Figure 8, in the closed position.
• Figure 10 is a view similar to that of Figure 9 according to a fourth embodiment of the invention.
• Figure 11 is a view similar to that of Figure 9 according to a fifth embodiment of the invention.
• FIG. 12 is a view similar to that of Figure 9 according to a sixth embodiment of the invention.
• FIG. 1 shows a flap 2 of a gas valve, in particular recirculated exhaust gas for a motor vehicle engine.
• the flap 2 and a drive shaft 7 of said flap are fitted into each other at a connecting shaft 5.
• the flap 2 is oriented substantially parallel to its axis of rotation corresponding to the longitudinal axis of the shaft 7.
• Such a flap comprises, in particular, a first flange 3 integral with a second flange 4 themselves secured to the barrel 5.
• the flanges 3 and 4 and the barrel 5 may, for example, be from the same material.
• the wings 3 and 4 are substantially rectangular.
• the drum 5 is substantially cylindrical and comprises a substantially cylindrical bore 6 which is coaxially arranged in the barrel 5. It will be noted that the wings 3 and 4 may, in an alternative embodiment of the invention, be in the same plane, that is to say, form a single wing, located on both sides of the shaft.
• FIG. 2 illustrates a valve 1 in the form of a casing 10 in which the shutter 2 is mounted. This is a valve that makes it possible to selectively direct exhaust gases either outwards or to a recycling circuit.
• the drive shaft 7 comprises an end 22 connected to an actuating motor 20 by transmission means (not shown) configured to transmit the movement of the motor to the flap 2 via the shaft 7.
• the housing 10 comprises a flange 11 in which is formed an opening 12 delimited by tabs 13, 14, 15, 16 projecting into the opening 12 and on which the valve 1 is mounted so as to allow the tilting of the flap 2 between a plurality of open position and a closed position of the opening 12.
• the tabs 13, 14, 15, 16 are configured to seal the valve 1 in the closed position of the shutter 2.
• the housing 10 comprises a duct 25, here closed by the shutter 2 in contact with the flange 1 1.
• the flap when the flap is in the open position, the fluid flows in the inlet valve to a second outlet, also not shown, or both to the first and second outlets.
• the shaft 7 opens through a passage 26 formed in the housing 10 towards the transmission means.
• Said valve may comprise a first level 21 for the rotation of the shaft at said passage 26.
• the shaft 7 is also mounted in the housing 10, in particular via a second bearing 21.
• Various axial stops may also be provided for positioning said shaft along the axis of rotation.
• a seal 24 is arranged in the passage 26, around the shaft 7.
• the exhaust gas When the exhaust gas comes into contact with the shutter 2, it directs their heat through the wings 3, 4, the shaft 5 and the shaft 7 towards the transmission means.
• the heat of the exhaust gases is transmitted by the shaft 5 to the shaft 7 by the zone of thermal conduction existing between the shaft and the shaft to the vicinity of the passage 26, without possibility of dissipation upstream, causing the presence of high temperatures in the portion of the shaft 7 passing through said passage 26.
• the valve 1 in order to reduce the heat conduction between the shutter 2 and the shaft 7, the valve 1 comprises a cavity configured so as to locate the thermal conduction zone axially set back from a first edge of the shutter. 2 facing an axial end of the shaft 7 connected to the transmission means and / or the actuating motor of the valve, that is to say, here, the edge of the flap facing the passage 26 and / or the seal 24. In this way, the temperature is reduced at a given point along the shaft 7.
• the cavity is in the form of an annular space 28 formed by machining a portion of the outer wall of a portion 30 of length L of the shaft 7 so that that the diameter of the shaft at the portion 30 is less than the diameter of the shaft in a portion 32 of the shaft, said mounting, the mounting portion 32 being substantially the same diameter as the bore 6 made in the barrel 5 so as to allow the shaft 7 to be secured in the bore 6 of the barrel 5.
• the first of the connecting barrels 5, located near the first edge of the flap, that is to say the one on the right in the figure, is axially recessed. said first edge.
• a cavity 36 in the form of an annular space, is, in addition, formed substantially in a median portion of the flap 2 between the first connecting barrel and a second barrel of link 5, located on the left in the figure.
• the barrel 5 is continuous along the shaft, while having its end facing the housing 26 axially set back from said first edge of the flap.
• a cavity is formed both by machining the shaft 7 and axial offset of the shaft. 5 closest to passage 26.
• FIG. 7 shows a flap 2 presenting a variant of shape.
• Such a flap comprises a first flange 3 and a second flange 4 integral with a drum 5 and mounted symmetrically on either side thereof, that is to say in the same plane further comprising the axis the shaft or axis of rotation of the flap.
• the wings 3 and 4 are here two portions of a circle configured so as to give the contour of the flap substantially a circle shape.
• the wings 3 and 4 and the barrel 5 may, for example, be from the same material.
• FIG. 8 illustrates a valve 1 in the form of a housing 10 in which the shutter 2 is mounted. It is here a metering valve allowing the duct 25 to be closed more or less along which the shutter 2 has climbed.
• the shaft 7 comprises an end 22 mounted connected to the actuating motor 20, either directly or via transmission means.
• a passage 26 allows the passage of the shaft of the conduit 25 to the motor and / or the transmission means. It is equipped with a bearing 21.
• Sealing means 18, here in the form of a lip seal, make it possible to prevent the exhaust gases, flowing in the clearances provided between the flap 2, the housing 10 and the shaft 7 from penetrating in a housing housing in the housing 10 to reach the actuating motor 20 and / or the transmission means, through the passage 26.
• FIG. 10 illustrates a solution according to the invention and similar to that of FIG. 5.
• the cavity is here in the form of an annular space 28 formed by machining a portion of the outer wall of a portion 30 length L of the shaft 7 so that the diameter of the shaft at the portion 30 is less than the diameter of the shaft in the shaft mounting portion 32, the mounting portion 32 being substantially same diameter as bore 6 realized in the barrel 5 so as to allow the shaft 7 to be secured in the bore 6 of the barrel 5.
• the diameter of the shaft is identical on either side of the portion 30 having the annular space 28.
• the cavity is formed in the drum 5. It is configured so as to form a heat shield along the shaft 7 in the direction of the end of the shaft located on the shaft. side of the passage 26.
• the cavity is here in the form of an annular space 36 formed by machining a portion of the barrel 5.
• a cavity 36 is machined both in the barrel 5 and in the shaft 7.
• the cavity extends, on the one hand, axially from a zone of the shaft penetrating into the passage 26, this towards a central part of the conduit 25, and, on the other hand, part, radially between the shutter 2 and the shaft 7.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
• Lift Valve (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47116067

Family Applications (1)

Country Status (7)

Families Citing this family (4)

Family Cites Families (20)

• 2011
  • 2011-10-26 FR FR1159712A patent/FR2982005B1/fr not_active Expired - Fee Related
• 2012
  • 2012-10-11 EP EP12780237.9A patent/EP2771596A1/de not_active Withdrawn
  • 2012-10-11 JP JP2014537686A patent/JP2014530992A/ja active Pending
  • 2012-10-11 WO PCT/FR2012/052309 patent/WO2013060963A1/fr active Application Filing
  • 2012-10-11 KR KR1020147013865A patent/KR20140084262A/ko not_active Application Discontinuation
  • 2012-10-11 CN CN201280064743.4A patent/CN104067038B/zh not_active Expired - Fee Related
  • 2012-10-11 US US14/353,091 patent/US20140367600A1/en not_active Abandoned

Non-Patent Citations (2)

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