Classifications

• • 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
  • F16K1/224—Details of bearings for the axis of rotation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
  • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
  • B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
  • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
  • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
  • F02D9/1035—Details of the valve housing
  • F02D9/106—Sealing of the valve shaft in the housing, e.g. details of the bearings
• • 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
  • F02M26/72—Housings

Definitions

• the present invention relates to a fluid circulation valve, particularly for a motor vehicle and a method of manufacturing such a valve.
• fluid flow valves comprising a body having a fluid passage duct, a flap, a shaft, free in rotation, on which is fixed the flap, and a rotary control member for rotation of the shaft.
• the rotation of the flap makes it possible to regulate the flow of fluid flowing in the duct.
• the rotation of the control member and therefore of the shutter is controlled by an electric motor, against the action of a torsion spring of the control member.
• the return spring maintains the control member in a predetermined position of opening or closing the valve, in the absence of actuation of the valve.
• the shaft is for example made of a metal rod.
• the control member comprises a plate and a toothed sector of plastic material overmolded on the plate.
• the metal rod is secured to the control member by stamping an axial end of the rod in a hole of the plate.
• the control member is overmolded on the metal rod.
• distal end At the opposite end of the shaft (hereinafter distal end) it is known to form a stop for keeping the shaft in position in the valve body, in cooperation with a pulling action of the return spring. in torsion, exerted on the shaft via the control member.
• a folded washer fitted and welded to the cylindrical portion of the shaft.
• a stepped bearing may be arranged to guide the shaft in rotation.
• Such an embodiment of the stop has good resistance to friction and vibration. However, it has a large axial size.
• a stop at the distal end of the shaft is made by means of a pin fitted in the valve body and fixed at the distal end of the shaft.
• the pin assembly also has a large footprint.
• the invention aims to overcome the problems mentioned above and proposes in this sense a fluid circulation valve, particularly for a motor vehicle, comprising a valve body having a conduit for the passage of a fluid, a shutter shutter of driven, a shaft on which is fixed the shutter, a rotary control member of the shaft, fixed to the a level of a proximal end of the shaft and whose rotation selectively controls the opening and closing of the conduit by the shutter, and a torsion spring of the control member, a stop being provided at the level of a distal end of the shaft, opposite to the proximal end, for maintaining in axial position the shutter in the conduit by cooperation with the valve body, against a force of the return spring, the stop having a flat washer fixed on the lateral end of the tree.
• the positioning of the shaft in the valve body is ensured by means of a flat washer fixed on the lateral end of the shaft.
• a flat washer fixed on the lateral end of the shaft.
• Such a solution is notably more compact than the known solution implementing a folded washer fitted at the end of the shaft.
• the solution proposed here does not require, moreover, particular surface treatment.
• the lateral end on which is fixed the flat washer has a circular groove, the weld bead between the lateral end of the shaft and the flat washer being received in the groove.
• the lateral end on which is fixed the flat washer has a centering stud, the groove being preferably formed at the base of the centering stud.
• a distal bearing for rotating the shaft relative to the valve body is interposed between the flat washer and the valve body, the flat washer now in contact with the distal bearing against the valve body.
• the valve body has a shoulder forming a receiving housing of the distal bearing.
• valve comprises a proximal bearing for guiding the shaft in rotation relative to the valve body, opposite, with respect to the shutter, to the flat washer, a seal being preferably arranged axially between the proximal bearing and the body of the valve; valve.
• the valve comprises a guide sleeve in rotation of the shaft relative to the valve body, with an integrated seal, opposite to the shutter, to the flat washer.
• the invention also relates to a method for manufacturing a fluid circulation valve, particularly a valve for a motor vehicle, comprising the steps of:
• the washer being welded to the lateral end of the shaft, the weld bead being preferably formed in a groove.
• a plating force of the washer on the valve body or a distal bearing, and a plating force of the shaft on the flat washer are applied, the plating force of the flat washer on the body valve, or the distal bearing, being greater than the thrust force of the shaft on the flat washer.
• the method comprises a step of forming a centering stud on the lateral end of the shaft, intended to be the opposite end of the shaft relative to the control member, and a groove the base of the nipple.
• Figure 1 is an axial sectional view of a portion of an embodiment of a fluid circulation valve.
• FIG. 2 is a perspective view of the assembly of the control shaft and of the drive member of the valve of FIG. 1.
• FIG. 3 shows, in perspective, a plate of the drive member of FIG. 2.
• FIG. 4 is a diagrammatic sectional view of an enlargement of a detail of FIG.
• FIG. 5 illustrates the same detail of FIG. 4, during a step of manufacturing the valve of FIG. 1.
• the invention relates to a fluid circulation valve 1, in particular for a motor vehicle.
• This is a valve for adjusting the intake gas flow of a heat engine, in particular a metering valve for a diesel engine.
• the valve comprises a body 2 inside which is formed a conduit 3 for circulating the fluid.
• the body 2 is here intended to be mounted, by means of connections, on an engine intake line so that the portion of the gases flowing in this branch passes through the duct and is directed towards the engine to participate in the combustion. .
• the connections and the intake line have not been shown, being well known in themselves.
• a shaft 4 free in rotation with, integral with it, a flap 5 for closing more or less the duct 3 according to the angular position of the shaft 4, as illustrated by the arrow marked 20 rotating about the longitudinal axis A of the shaft 4.
• the shaft 4 is connected in rotation to the shutter 5 by fasteners 14, here a screw-nut system, or the like, which allows the shutter to rotate with the shaft between two extreme positions of which the one, fully open, as in Figure 1, passes the fluid, and the other, not shown, blocks its passage, the flap then being applied against the side wall of the duct 3.
• fasteners 14 here a screw-nut system, or the like, which allows the shutter to rotate with the shaft between two extreme positions of which the one, fully open, as in Figure 1, passes the fluid, and the other, not shown, blocks its passage, the flap then being applied against the side wall of the duct 3.
• the valve 1 further comprises, for example, pivot connection means between the body 2 and the shaft 4, here two lower (or distal) bearings 6 and upper (or proximal) 7, for the rotary movement of the shaft 4 with respect to its longitudinal axis.
• two aligned holes 9A, 9B are formed in the body 2, perpendicular to the conduit 3, passing diametrically through it, to form housings, of circular section, of passage of the shaft 4. They respectively receive the connecting means pivots, namely the two bearings 6, 7.
• These are cylindrical annular section and are, in this example, forcibly mounted in the holes 9A, 9B so as to be immobilized in position, in rotation and in translation, relative to the body 2 of the valve.
• These fixed bearings 6, 7 are made, for example, of a material which provides them self-lubricating properties and anticorrosive appropriate providing increased durability. For this, they can be made of an alloy of copper and nickel or tin, or a stainless steel.
• the shaft 4 which can thus freely rotate about the axis A, by a sliding fit provided between the shaft and the bearings.
• the end 1 1 of the shaft described as lower than that of FIG. 1, engages in the corresponding bearing 6, while the other upper end 12 passes through the other bearing 7 and opens outwards. of the body 2 of the valve 1 to be connected to a member 21 for controlling the rotation of the shaft 4.
• control member 21 is, for example, a toothed sector wheel 22 comprising a central portion 24 centered on the shaft 4 and a radial protuberance 26, forming a corner sector. slightly greater than the angular clearance of the flap and provided with gear teeth 28.
• the toothed sector 22 is here rotatably connected to a return wheel 30 free in rotation with respect to the body 2 about an axis of articulation 32 parallel to the longitudinal axis A of the shaft 4.
• the valve 1 further comprises an electric motor, not shown, including a stepper motor.
• the electric motor meshes with a large pinion 36 of the idler wheel 30 while the toothed sector 22 meshes with a small pinion 37 of the latter.
• the actuation of the motor thus causes a rotation of the return wheel 30 which in turn causes rotation of the toothed sector 22 and thus of the flap 5 via the shaft 4.
• the control member 21, the intermediate wheel 30 and / or the motor are positioned in a housing 38 of the valve closed by a cover 40.
• the valve may further comprise a torsion spring 42 for positioning the flap 5 in a rest position, here an open position.
• the torsion spring 42 is a return spring in position of the control member 21. By position of rest, one hears a position taken when the motor of the valve is not actuated.
• the torsion spring 42 is supported, on the one hand on the body 2, here via an upper shoulder 44, and on the control member 21, at a slot 46 ( Figure 2).
• the torsion spring 42 is centered, in particular, on the longitudinal axis A.
• control member 21 is overmolded on the shaft 4. In this way there is ensured a connection without play between these two parts. We can also pre-assemble them before mounting in the body 2.
• the control member 21 is, for example, plastic material and / or the shaft is, for example, metal, especially stainless steel.
• the control member 21 here comprises walls forming a well 48, extending axially beyond a wall 50 extending radially, in particular orthogonal to the shaft 4, and carrying the gear teeth 28.
• L control member is overmolded on the shaft 4 at the well 48.
• the shaft may further comprise a groove 52 in which the control member 4 is overmolded.
• the well 48 and / or the groove 52 contribute to an effective connection of the control member 21 and the shaft.
• the valve 1 may also comprise a plate 54, in particular a metal plate, defining one or more radial stops 56, 56 '(FIGS. 2 and 3) delimiting an angular stroke of the control member 21. More specifically, the plate 54 is rotatably connected to the shaft 4 and overmolded by the control member 21. Furthermore, in the extreme angular positions of the valve 1, the radial stops 56, 56 'come into contact with non-visible shapes formed in the body 2 of the valve. In this way, the angular displacement of the control member 21 is defined. As best seen in Figure 3, the plate 54 comprises two radial arms 58, 58 'respectively terminated by the radial stops 56, 56'.
• the plate 54 also has, at the intersection of the arms 58, 58 ', an orifice 60 for the passage of the shaft 4.
• the shaft 4 and the through hole 60 are mutually configured to ensure a transmission of the forces of Radial abutment of the plate 54 to the shaft 4.
• the shaft 4 here has a flat portion 62 ( Figure 1) and the passage hole 60 a straight portion 64.
• the shaft 4 is adjusted in the hole of passage 60 so that the flat 62 bears against the straight portion 64.
• the toothed sector 22 is thus not biased during abutments of the plate 54 against the body 2.
• the valve 1 further comprises a sensor target 66.
• a sensor target 66 such as a flat magnet, that is to say a rectangular parallelepipedic magnet whose two largest faces are arranged perpendicular to the axis of rotation A of the control member 21.
• the magnet 66 generates a magnetic field for influencing a magnetic sensor 68, in particular a Hall effect probe, here positioned on the cover 40 of the valve 1.
• the flat magnet 66 is substantially rectangular parallelepiped. It has two faces oriented orthogonal to the longitudinal axis A of the shaft 4. It is also centered on the longitudinal axis A.
• the flat magnet locally generates in this manner parallel field lines, in a plane orthogonal to the longitudinal axis A.
• the angular positioning of the control member 21 and therefore the position of the flap 5 correspond to an identical angular positioning of the field lines, which makes the measurement more reliable.
• the valve 1 further comprises a housing 70 for receiving the sensor target 66.
• the housing 70 is advantageously derived from the molding of the control member 21 so as to also reduce the angular gaps between the moving parts of the valve 1. Such a way of producing the housing 70 also makes it possible to limit the number of operations necessary for the manufacture of the valve.
• the sensor target 66 is, however, inserted in the housing 70, after the formation of this housing 70. Thus, the housing 70 is not obtained by overmolding the sensor target 66. This makes it possible to avoid damaging the sensor target during the molding operation of the control member 21.
• the housing 70 is formed here of four walls 72.
• the housing 70 and the sensor target 66 preferably have complementary shapes, including rectangular parallelepiped shapes.
• the sensor target 66 is, for example, positioned flat on a bottom of the housing 70.
• the walls 72 of the housing 70 also have a tongue 74 projecting from the axis A of rotation of the control member 21. These tabs 74 are folded over the sensor target 66 to ensure its retention in the housing 70, once the sensor target 66 inserted into the housing 70.
• the shaft 4 as illustrated in the figures also comprises an axial abutment 76, located at the end 1 1 of the shaft, opposite the control member 21 (that is to say opposite to the end of the shaft 4 at which is fixed the control member 21).
• this end 1 1 is called the distal end of the shaft 4, with reference to the control member 21 which is fixed at the proximal end of the shaft 4.
• the longitudinal segment 78 of the shaft 4 extending from the shutter 5 to the control member 21 does not have to cooperate with an axial stop, the latter being provided in the distal portion of the shaft 4.
• the segment 78 is called thereafter free zone.
• This axial abutment 76 makes it possible to keep the shutter 5 in the axial position in the duct 3, in cooperation with the valve body 2, against a tensile force of the torsion return spring 42 on the shaft 4. Traction effort tends to remove the shaft 4 from the holes 9A and 9B.
• the free zone 78 is more particularly located here from an upper end 80 of a slot 82 for fixing the shutter 5 to a lower end 84 of the well 48. In other words, the free zone 78 is located at the right of the passage 9B of the control shaft 4 towards the housing 38 accommodating the control member 21.
• the axial abutment 76 comprises a flat washer 102, fixed on the distal end 1 1 of the shaft 4, that is to say on the circular surface of this distal end 1 1 of the shaft 4, perpendicular to the axis A of the shaft 4.
• the use of a flat washer 102 allows for a stop with a small axial size. Fixing the flat washer 102 on the lateral end of the shaft avoids the obligation to carry out expensive surface treatments.
• Fixing the flat washer 102 on the distal end 1 1 of the shaft 4 may in particular be made by welding.
• the weld bead between the washer 102 and the distal end 11 of the shaft extends over an angular sector of 360 °, the cord preferably still forming a circle.
• the weld bead may have other shapes; it can also be discontinuous.
• this weld bead does not imply an extra thickness with respect to the surface of the distal end 1 1 of the shaft 4 and the washer 102 rests on substantially the entire surface of the lateral end of the shaft not forming the groove.
• this groove 104 is, as represented in FIG. 4, made at the foot or at the base of a centering stud 106 formed on the surface of the lateral end 1 1 and intended to cooperate with the central opening. in the washer 102 to ensure the centering of this washer 102 relative to the shaft 4.
• the centering pin 106 is formed by machining the distal end 1 1 of the shaft 4, which machining naturally forms a groove at the foot of the pin 106.
• the section of the groove 104 is here represented in the form of a semicircle, but this section can be of different shape. In particular, the section of the groove may have a chamfer on a radially outer portion.
• the groove 104 also makes it possible to minimize the concentrations of mechanical stresses in the shaft 4.
• the axial stop 76 and the body 2 are, advantageously, mutually configured to axially lock the washer 102 on the body 2 in a first direction, facing the control member 21, the first direction corresponding to the direction of a force axial printed to the shaft by the torsion spring 42.
• the bearing 6 is interposed between the washer 102 and the valve body 2.
• this stepped bearing 6 is here received in a housing of complementary shape formed by a shoulder in the body of valve 102.
• the washer 102 maintains this bearing 6 against the valve body 2.
• valve is configured so that the axial stop is also locked axially in a second direction, opposite to the first direction.
• control member 21 comprises a slot 46.
• the latter accommodates one end of a torsion spring 42, not shown in this figure but visible in the figure 1.
• the slot 46 passes axially through the wall 50 of the control member 21.
• the slot 46 advantageously defines two attachment positions for the torsion spring 42.
• the slot 46 is oriented, for example, along a corner sector, centered on the longitudinal axis A of the shaft 4.
• the slot 46 defines in this way an attachment position of the torsion spring 42 at each of its angular ends.
• valve body is made prior to mounting the parts mentioned above in the valve body 2, for example by molding.
• the assembly of the parts can then take place as follows.
• a seal 100 and the upper 7 and lower 6 bearings are arranged in the body 2 respectively at respective shoulders, the first shoulder.
• the upper bearing assembly 7 and seal 100 may, alternatively, be replaced by a guide sleeve of the shaft 4 with an integrated seal.
• the movable assembly comprising the control member 21 and the shaft 4 is then mounted in the through holes 9A, 9B being introduced from top to bottom, the torsion spring 42 having been installed between the control member 21 and the body 2.
• the washer 102 is then centered on the distal end 1 1 of the shaft by means of the centering stud 106, which is preferably machined on the shaft 4, prior to the insertion thereof into the valve body. .
• the flat washer 102 is then fixed in particular welded on the surface of the distal end 1 1 of the shaft 4.
• the weld bead is in this case formed in the groove 104 as mentioned above.
• the washer 102 is subjected to a double force:
• a valve as just described finds its applications in particular as a fluid circulation valve for a motor vehicle.
• a valve can be used as a gas metering valve internal combustion engines or as an exhaust gas recirculation valve or EGR valve.
• the groove 104 can be made at any radial level on the surface of the distal end 11 of the shaft 4, even if the groove presented has the advantage of not requiring any additional operation to be performed, since it is formed naturally by the machining of the distal end 1 1 of the shaft 4 to form the centering stud 106.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lift Valve (AREA)
• Electrically Driven Valve-Operating Means (AREA)
• Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
• Exhaust-Gas Circulating Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

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• 2014
  • 2014-07-23 FR FR1457086A patent/FR3024200B1/fr active Active
• 2015
  • 2015-07-20 US US15/327,493 patent/US20170159828A1/en not_active Abandoned
  • 2015-07-20 JP JP2017503575A patent/JP2017522513A/ja active Pending
  • 2015-07-20 EP EP15759856.6A patent/EP3172468A1/de not_active Ceased
  • 2015-07-20 CN CN201580040899.2A patent/CN106662258A/zh active Pending
  • 2015-07-20 WO PCT/FR2015/051995 patent/WO2016012710A1/fr active Application Filing

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