WO2011076899A1

WO2011076899A1 - Valve particularly intended to be set up in an air intake circuit of a heat engine

Info

Publication number: WO2011076899A1
Application number: PCT/EP2010/070588
Authority: WO
Inventors: Stéphane LESTIENNE; Stéphane SORIN; Samuel Leroux
Original assignee: Valeo Systemes De Controle Moteur
Priority date: 2009-12-23
Filing date: 2010-12-22
Publication date: 2011-06-30
Also published as: FR2954442A1; FR2954442B1

Abstract

The invention relates to a valve (1) including a body wherein at least one shutter (V1', V2', V3', V4') is mounted onto a shaft (A) so as to be movable between at least a closed position and a fully open position of a pipe (C'2, C'3, C'4, C'5) that is provided in the body. In accordance with the invention, the axis (X) of the shaft (A) is shifted relative to the central axis (Y) of the shutter and relative to a median plane (P) of the shutter.

Description

Valve intended, in particular, to be implanted in an air intake circuit of a heat engine.

The present invention relates to a valve desti ^¬ born, in particular, to be implanted in an air intake circuit of a heat engine. The invention also relates to such an intake circuit.

BACKGROUND OF THE INVENTION

It is known to use valves to control the passage of air in the cylinders of a heat engine, these valves being controlled in order to optimize combustion by improving the fuel air mixture during the intake phase.

In order to improve combustion, it is possible, in particular, to use a device with supply ducts whose geometry allows the creation of a swirling air movement, also called "swirl", in the combustion chamber . This type of dis ^¬ positive is common in diesel injection engines: there are generally two supply ducts per cylinder, including a main duct and a duct ^{¬ ¬} condaire, closure of the main duct for the creation of the current of "swirl ".

Whether in the specific context of the crea ^¬ a current "swirl" or more in the context gen ^¬ airflow neral in an intake circuit, we understand that it is important for van The flow control of the different air flows operate reliably and precisely. So when el ^¬ must completely close off a flow of air, while leakage causes air leaks INTEM ^¬ pestives from creating losses and distur- bances having a negative impact on the overall make ^¬ of the motor. The valves are generally, in known manner, in the form of a body provided with a conduit in which one or more panels are mounted on the same ar ^¬ ber. In the case of valves controlling the passage of air into the cylinders of a combustion engine, it generally has ^¬ a main duct and a secondary duct per cylinder. The shutters are each provided with a tra ^¬ pouring sleeve, arranged in the middle part of the flaps, in the ^¬ which is received the tree, so that the axis of the shaft passes through the center of each flap, in his plan. The rotation of the shaft, guided by bearings and actuated by motor means, causes the movement of the flaps of a closed position, where the flap rests against a shoulder (also called seat) in the duct, at a fully open position, where the flap is detached at the maximum of this shoulder, with different possible intermediate positions. The game between the flaps and firstly associated seats, ^¬ be the tree and its other bearings allows the move- ment right shutters to and from their posi tions ^¬ shutter, minimizing both the risk of leakage between the edge flaps, seats asso ^¬ ciated once the shutters in the closed position, and the risk of jamming the shutters when they dock or leave their associated seats.

However, this shutter design is subject to improvement. In fact, in particular, the associated flap / seat edge interface when the shutter is in the closed position is interrupted locally in two diametrically opposite zones to one another and corresponding to the passages of the traversing axis, which creates potential ^¬ LEMENT an increased risk of leakage in these areas specifi c ^¬ along the shaft housing.

OBJECT OF THE INVENTION The invention relates to a valve, the design ^¬ aims to minimize the aforementioned disadvantages.

It purports an improved valve design, at best limiting the risk of leaks or when a Sev- eral flaps mounted on the same shaft pass in posi ^¬ shutter, and, incidentally, also limiting any risk of jamming when the shutters they are moved in rotation.

GENERAL DEFINITION OF THE INVENTION

The aforesaid problem is solved in accordance with the in vention ^¬ using a valve comprising a body in which at least one flap is mounted on a shaft to be movable between at least a closed position and a fully open position of a conduit formed in said body. According to the invention, the axis of the shaft is offset relative to the central axis of the flap and relative to a median plane of the flap.

Is understood within the meaning of the invention component a component defining two opposite main faces, usually substantially planar and parallel to el ^¬, said flap being designed to pivot relative to an axis. The flap is here preferably butterfly type, and can adopt different geometric shapes, including having a circular circumference, oval, parallelepiped. It has a central axis, usually its Syme axis ^¬ sorts, through the center, which is normal to its main fa ^¬ these. The middle plane of the shutter comprises a plane passing through the thickness of the flap, and substantially equidistant from its two main faces.

In the aforementioned prior art, the axis of the tree not ^¬ knows by the median plane of the flap, and orthogonally crosses the central axis of the shutter.

The axis of the shaft is according to the invention doubly offset from this known configuration.

Indeed, on the one hand, it is offset from median plane of the shutter, allowing contact between the periphery of the shutter and the periphery of the associated seat which is continuous when the shutter is in the closed position. This continuous contact flap / seat over the entire circumference of the flap is extremely advantageous because it eliminates potential leakage problems in the zones of dis ^¬ continuity due to the passages of the traversing shaft in its prior known configuration. The shaft is thus depor ^¬ ter out of the seating area of the ducts, so that it no longer compromises the flap / seat seal when the flap is in the closed position.

And to make that possible without creating ^¬ lems flap jamming against the walls of the ducts when the shutters are driven in rotation and without resorting to complicated forms of leads, it also has shifted the axis of the shaft relative to the central axis of the shutter, so that these two axes do not cross any more. The offset provided is sufficient for the flap to rotate appropriately to adopt all the positions provided from the full opening to the shutter, without its perimeter comes rubbing on the walls of the duct when it rotates, without risking problems. berthing when it arrives in its closed position against its associated seat.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features and advantages of the inven ^¬ tion will become more apparent in light of the ^¬ scription which follows and the accompanying drawings relating to a particular embodiment, with reference to fi gures of the accompanying drawings where:

- Figure 1 illustrates a sectional view of a valve according to the prior art;

FIG. 2 illustrates a perspective representation of a valve according to the invention without the shaft provided with its shutters; - Figure 3 illustrates a sectional view Transver ^¬ dirty with a flap according to the invention in the closed position of a duct (the shaft on which the flap is mounted not being shown);

- Figure 4 is a cross-sectional view of a shutter according to the invention according to Figure 3, in the closed position of the conduit which it is associated in the valve according to a first variant;

- Figure 5 is a cross-sectional view of a shutter according to the invention according to Figure 3, in the closed position of the conduit which it is associated in the valve, according to a second variant.

The set of figures is very schematic and does not necessarily respect the scale to facilitate reading, each represented element retaining the same reference in all figures.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION Figure 1 shows in cross section, of fa ^¬ very simplified Con, the implantation of a valve according to the prior art in an air intake circuit of an internal combustion engine . There is shown a body 1 delimiting a main duct C1 into which three secondary ducts C2, C3, C4 open. In the body 1 is mounted a shaft A of axis X and transverse to the second conduits C2, C3, C4. On the shaft A, are mounted tightly three shutters V1, V2, V3.

The shutters are here butterfly type. They have a corresponding substantially circular contour to the contour of the openings through which the second conduit C2, C3, C4 open into the main Cl conduit. The vo ^¬ threads include two opposing faces substantially flat and parallel to one another, except in a central area crossing the shutter over its entire diameter and which defines a sleeve (not shown) in which is engaged 1 'A. When the shaft A rotates to bring the shutters in the closed position against the seats (not shown) of the secondary conduits C2, C3, C4, the edges B1, B2, B3 of the flaps rest on the seats, with however, two contact discontinuities corresponding to the two diametrically opposed zo ^¬ passage nes ΑΙ, Α'1 tree A. Even when the shutters are perfectly applied to their associated seats, there are risks of leakage loca ^¬ lisées in these zones ΑΙ, Α'1 where the shaft A is in contact locally with each seat, risks which it is difficult to remove by keeping this configuration of valve.

Figure 2 shows a valve according to the invention, which has been removed the shutters and the shaft that carries them for clarity. This figure will be described with FIG. 3, which represents a shutter of the valve according to the invention, and FIG. 4, which represents the same flap once in support, in the closed position, on the seat of its associated duct in valve.

The valve according to the invention comprises a conduit prin cipal ^¬ and four secondary conduits C 2, C 3, C 4, C 5 ^¬ tines to be shut off on command by four flaps my ^¬ tight sides and in series on a shaft mu A in rotation using motor means and not shown. The valve thus consists of n modules, with, here, n equal to 4, each module having its secondary conduit and its associated flap opening into the main conduit. The axis X of the shaft A has been offset, so as to no longer traver ^¬ ser seat C 21, C 31, C 41, C 51 of the conduits secondai- res as follows. It can be seen in Figure 2 that the bore 01 of the orifice 08 to rece ^¬ see the shaft A is shifted forwardly, in the figure, relative to the positioning seats of conduits ^¬ ondary. As illustrated more precisely in FIG. 3: the flap VI '(and, identically, the other three flaps) is circular, delimited by two flat faces F1, F2 connected by a side edge B '1 thinned. This ^¬ side face Β '1 may have a truncated shape or to ^¬ America. The flap VI 'has a central Y axis of symmetry passing through its center 0, and a median plane P which passes substantially in the thickness of the flap in its middle, which is perpendicular to the central axis. This plane P is also substantially that which can be ^de¬ signed by the so-called sealing plane, once the flap bears on the associated seat of the duct. The flap, in or ^{¬ be} , is provided with a sleeve V'11 in which is received the shaft A, the sleeve being arranged projecting from one side of one of the faces Fl of the flap. This sleeve delimits a passage section S intended to receive the shaft, a section centered on the axis X of the shaft, and whose central axis ^¬ tral, which is substantially the axis X of the shaft A , do not cross the central axis Y of the flap VI '.

As represented in FIG. 3, the axis X of the shaft A is offset with respect to the central axis Y of the flap VI 'of a given distance d2 (the distance d2 being measured perpendicularly to the two axes). Thus, it imposes a minimum distance between the axis X of the shaft and the center 0 of the flap, so that the movement of the flap V 1 from one position to another, and especially when it docked or left the seat of the duct C'2, is not upset by friction of its edge against the inner wall of the duct.

This axis X of the shaft A is also offset relative to the median plane P of the shutter of a given distance dl. This gap guarantees a continuity of contact vo ^¬ lets / seats, the tree thus being deported out of the seating area of the secondary ducts.

As detailed in FIG. 4, and according to a first variant, the shutter VI '(and all other shutters in the same way) cooperates, in the closed position, with a seat C'21 present in the conduit C'2 associated, the seat having a scope pt at least partially in the form of a truncated cone whose Z axis is inclined relative to the central axis Y of the flap in position d shutter and / or relative to the axis of the conduit. Here, the central axis Y of the flap and the axis of the duct are conf ^{¬ ¬} owed. The seat area intended to come into contact with the edge B '1 of the flap, when in the closed position resting on the seat, is understood by bearing.

The edge B '1 of the flap can be of curved, toric or frustoconical profile to facilitate the docking of the vo ^¬ let against the seat. Here, it is at least partially in the form of a sphere portion, thus a toric surface, whereas the seat span area on which it will rest when the shutter is in the closed position is tapered . Thus, in the closed position, a linear contact between the edge of the flap and its associated seat, with two advantages to this: firstly, it avoids jamming the flap when it leaves or arrives in its position d ' shutter, on the other hand, it ensures a good seal when it is in the closed position.

The fact that the Z axis is inclined with respect to the axis X allows the flap VI to pivot with respect to the axis X without its edge coming jamming or rubbing excessively against the bearing surface pt or the inner wall of the leads to the vicinity of the C'21 headquarters. The inclination a is preferably between 0 ° and 20 °, especially at least 2 or at least 5 °, and here about 10 to 15 °, which gives the flap the desired deflection relative to his duct C'2 associated. It is thus seen that, according to the invention, there may be an offset (angle Supé ^¬ laughing at 0 °) or not (angle 0 °).

FIG. 5 represents a second variant of positioning the flap in the seat of the duct, in po- shutter position: here, the Z axis is not inclined relative to the central axis Y of the shutter in the closed position and / or relative to the axis of the duct: there is no angular offset and the angle Θ as shown in the figure is both the angle of the cone of the seat and that measuring the spacing of the edges of the flap. FIG. 5 represents, by the dashed lines, the trajectory of the flap V 1 towards the seat C'21 of the associated duct. The angles β and γ as shown are the angles of the tangent to the path of the shutter VI in the closed position of the duct, measured in a plane perpendicular to the axis X of the shaft A and passing through the center 0 of the Part VI. According to the invention, and therefore also ^¬ in the case of the variant shown in Figure 4, these two angles are at least 3 °, and are in particular between 5 and 15 °. They are here about 5 °. Preferably, the values of the angles β and γ are chosen to be identical or similar. The choice of these angle values ensures a trajectory of the flap without friction or jamming.

According to the invention, the values ap ^¬ are selected for the distances dl and d2, and possibly, when it is provided, the inclination of the Z axis of the seat having a bearing at least partially in the form of a trunk of cone relative to the central axis Y of the shutter in the closed position and / or relative to the axis of the duct, so as to obtain the values of angles β and γ in the range of values mentioned above. We have indeed a relation between dl, d2, Θ, r (r being the radius of the shutter) and the offset of angle a, that it is null or not, and the angles β and γ, which can be written as follows: β = ar siii

- Θ + a dl

| - arcstn

2 Optionally, the edge B '1 of the flap according to the invention is provided with a sealing component (not re ^¬ presented) of an elastically compressible material or having a shape making it radially deformable. This component is favorable to a better seal in the flap / seat interface area, and, incidentally, can make up games in the relative positioning of the flap and its associated seat. The offset angle ^α , when provided, provided between the X and Z axes is also favorable in this case, since it makes it possible to obtain as uniform a compression as possible of the sealing component (which can take the form of a closed element of the seal type, which comes, for example, to position itself around the flap by inserting in a groove made in the edge B '1 of the flap, or which marries said edge by covering it entirely ). The sealing means may be attached to the flap by any known means (overmoulding, gluing, or fastening by means Mecani ^¬ c in particular). The sealing means may also have the shape of a segment received in a groove peri ^¬ pheric flap.

The invention also relates to any intake circuit of a heat engine, comprising at least one valve as described above.

The invention is not limited to the embodiments Réali ^¬ tion that just described, but on the contrary covers any variant with means equi ^¬ valent, the essential characteristics specified above. Thus, in the example described, the flaps were mounted tight on the shaft, but they can indifferem ^¬ be mounted sliding in translation on the shaft, preferably sliding in translation and not in rotation.

The seat of the shutter can be defined by a shoulder defining the span, or be devoid of such a shoulder, the shutter being in the closed position when that it extends perpendicularly to the duct occupying the entire passage section thereof.

Similarly, the example described refers to a rained ^¬ Ralite shutters mounted on the same shaft, but the invention also applies to a valve with a single flap mounted on a shaft.

The shutters can be metal, plastic material or composite material.

In conclusion, the technical solution of the invention makes it possible to obtain a better tightness of the ducts when the shutters are in the closed position, by modifying the way in which the shaft is engaged in the shutters, but without significantly complicating the manufacturing thereof. .

Claims

1. Valve (1) comprising a body in which at least one flap (VI ', V2', V3 ', V4') is mounted on a shaft

(A) to be movable between at least a closed position and a fully open position of a duct (C'2, C'3, C'4, C5) formed in the body, charac ^¬ derision in that the axis (X) of the shaft (A) is offset relative to the central axis (Y) of the flap and relative to a median plane (P) of the flap.

2. Valve (1) according to one of claims pré ^¬ cedentes, characterized in that the flap (VI ') is provided with a sleeve (Vil') in which the shaft (A) is received, the sleeve being disposed projecting from one side of one of the faces (F1, F2) of the flap.

3. Valve (1) according to the preceding claim, characterized in that the axis of the passage section of the sleeve (Vil ') does not cross the central axis (Y) of the flap (VI').

4. Valve (1) according to one of the preceding claims, characterized in that a plurality of shutters

(VI ', V2', V3 ', V4') are connected in series on the same shaft (A).

5. Valve (1) according to one of the preceding claims, characterized in that the flap

(VI ', V2', V3 ', V4') is slidably mounted in translation or clamped on the shaft (A).

6. Valve (1) according to one of the preceding claims, characterized in that the flap (VI ', V2', V3 ', V4') cooperates, in the closed position, with a seat (C 21, C 31, C 41, C 51) present in the associated conduit (C 2, C 3, C 4, C 5), the seat having a seat

(p) at least partially in the form of a truncated cone whose axis (Z) is inclined with respect to the central axis

(Y) of the flap in the closed position and / or relative to the axis of the duct.

7. Valve (1) according to one of the preceding claims, characterized in that the angles (β, γ) of the tangent to the path of the flap (VI) in the closed position of the duct, measured in a plane perpendicu ^¬ to the axis (X) of the shaft (A) and passing through the center (0) of the flap (VI) are at least 3 °, and are in particular between 5 and 15 °.

8. Valve (1) according to one of claims pré ^¬ cedentes, characterized in that the flap (VI ', V2', V3 ', V4') is delimited by a frustoconical or toric lateral surface (B'1).

9. Valve (1) according to one of claims pré ^¬ cedentes, characterized in that the flap (VI ', V2', V3 ', V4') is delimited by a lateral surface (B'1) toric and in that that it rests, in the closed position, on a seat (C 21, C 31, C 41, C 51) present in the associated duct (C 2, C 3, C 4, C 5) whose range (pt) is in the form of a truncated cone.

10. Valve (1) according to one of claims pré ^¬ cedentes, characterized in that the flap (VI ', V2', V3 ', V4') is delimited by a side surface (B'1) which is provided with a sealing component in a my ^¬ terial elastically compressible.

11. Valve (1) according to one of claims pré ^¬ cedentes, characterized in that it is an air intake circuit valve of a heat engine.

12. Intake circuit of a heat engine, characterized in that it comprises at least one valve (1) according to one of the preceding claims.