FR2860548A1 - Power strainer for oil pump of thermal engine, has one opening of blocking chamber connecting suction inlets that are situated in direction opposite to another opening, and inertial blocking unit to block one opening relative to another - Google Patents

Abstract

The strainer has two suction inlets (20, 22) placed respectively in two opposite portions (24, 26) of oil pan (10). A longitudinal blocking chamber (28) is connected to the inlets by two opposite longitudinal openings (30, 32). Each opening connects the inlets that are situated in a direction opposite to the other opening. An inertial blocking unit (38) blocks one opening with respect to the opposite opening.

Description

1 2860548 Feed strainer for oil pump

  The present invention relates to a feed strainer for a heat engine oil pump.

  These heat engines, installed on motor vehicles, are piston engines and they comprise in particular a crankshaft to which said pistons are connected by a connecting rod and an oil pump intended to project the oil in particular between the pistons and the cylinders in which they slide.

  The oil is contained in a housing located in the lower part of the engine and is sucked from this housing by a pump, through said feed strainer which extends below the oil level when the engine is in operation. normal operation.

  A double constraint weighs on these engines; the first is the frequency of oil change which must be as low as possible and the second, the amount of oil stored in the housing which must also be the lowest possible. These two constraints are contradictory since the lower the quantity of oil, the greater the frequency of the oil changes.

  In addition, for a specific amount of oil stored in the housing, it is necessary that the feed strainer is always embedded in the oil so that the pump does not suck air and this, whatever the conditions driving the motor vehicle. Given the acceleration experienced by the engine and in particular the lateral acceleration due to the centrifugal force, when the vehicle approaches a turn, the oil is driven on one side or the other of the crankcase. It has therefore been imagined a double strainer having two suction inlets opening respectively in both sides and selective means of inactivation of said suction inlet according to the direction of acceleration.

  Such selective inactivation means, which are described in particular in document FR 2 388 991, comprise on the one hand a longitudinal closure chamber 2860548 intended to be connected or placed in communication, by two longitudinally opposite orifices, respectively to said suction inlet and secondly, an inertial closure member consisting of a ball, adapted to be driven in the same direction and the same direction as that of the oil during said acceleration, to release the orifice which connects the suction inlet opening on one side of the housing to which the oil is driven and to close the opposite orifice which connects the suction inlet opening on the other side.

  However, since the ball is driven in the same direction and the same direction as the oil, opposed to the direction of acceleration experienced by the engine, the orifice it closes must be connected to the opposite suction inlet, this necessitates the use of crossed conduits to connect respectively the suction inlets to the orifices.

  A problem that arises and that aims to solve the present invention is then to provide a feed strainer whose selective inactivation means do not require bulky cross ducts and reduce the space required for the strainer. food.

  For this purpose, the present invention proposes a feed strainer for a heat engine oil pump, said heat engine comprising a casing in which the oil is capable of being driven from one crankcase portion to another opposite portion when the vehicle undergoes an acceleration oriented in the opposite direction, said feed screen having an outlet, two suction inlets opening respectively into said opposite housing portions and selective means for inactivating said suction inlets; said selective inactivation means comprise, on the one hand, a longitudinal closure chamber oriented according to said housing portions, connected to said outlet and intended to be connected, by two longitudinally opposite orifices, respectively to said intake and intake ports; on the other hand, an inertial closure member adapted to be driven in the same direction and the same direction as that of the oil during said acceleration, to release the orifice which connects the suction inlet opening into the portion the casing to which the oil is driven and to close the opposite port which connects the suction inlet which opens into the opposite housing portion; each of the orifices of said chamber connecting the suction inlet which is situated in a direction opposite to the other orifice; and said inertial closure member being capable of closing the orifice which is oriented in the direction of said acceleration relative to the opposite orifice.

  Thus, a feature of the invention lies in the shutter mode for closing the orifice which is oriented in the direction of acceleration and to release the opposite orifice. In this way, each of the orifices may be connected to the suction inlet which is located in the opposite direction to the other orifice, which makes it possible to provide a feed strainer whose suction inlets extend from each side of the closure chamber, from the orifices and extend in opposite directions from one another along the same longitudinal axis. With this feature, the strainer occupies less space than the strainers according to the prior art since it does not have cross-connecting conduits.

  Furthermore, in order to simultaneously suck oil through the two suction inlets, especially when the acceleration undergone by the engine is zero, said inertial closure member, between the position where it closes one of the orifices and the position where it closes the other orifice is, advantageously, capable of occupying an intermediate position in which it simultaneously releases the two opposite orifices. Thus, all the oil contained in the crankcase circulates uniformly in the engine.

  According to a first embodiment of the invention that is particularly advantageous, said orifices are located facing each other and spaced apart at a first distance and said inertial closure member has two facing ends forming two flappers spaced apart by a second distance greater than the first distance, said ends of said shutter member being interconnected by a central portion extending longitudinally and which extends through said openings, said valves being respectively adapted to close said orifices alternately; .

  Thus, said valve ends are adapted to be applied alternately against the outer edge of the openings of the closure chamber by alternately closing said orifices. In this way, when the closure chamber is driven in one direction, one end of the inertial closure member is applied against the outer edge of the orifice oriented in the driving direction and the closes, while the other end tends to deviate from the outer edge of the opposite orifice, but is kept at a distance by said central portion which connects the two ends.

  According to a particularly advantageous configuration, the feed strainer according to the preceding embodiment is formed of a tubular piece having two open ends corresponding to said suction inlet and a central zone forming said closure chamber into which opens said outlet, said central zone having two opposite ends of substantially circular cross section into which respectively open said orifices, said facing ends being constituted by two valves and said central part by a rod connecting said valves. In this way, thanks to the central zone of circular symmetry and to the valves which are intended to cooperate with the opposite ends, the relative displacement of the inertial closure member and of the closure chamber is reliable and can occur. reversible way, in the two opposite directions symmetrically without risk of jamming.

  According to a second embodiment of the invention that is particularly advantageous, said orifices are spaced apart by a third distance and open into two surface portions of said closure chamber having the same curvature, and said inertial closure member presents two overlapping portions spaced a fourth distance greater than the third and defining a same curved surface substantially along said curvature, said cover portions being adapted to be driven in translation parallel to said surface portions to alternately close said orifices.

  Thus, the overlapping portions are respectively complementary surface portions against which they are slidable to alternately close the orifices. Because of the spacing of the overlapping portions which is greater than the spacing of the orifices, when one overlapping portion occludes one of the orifices, the other overlap portion is disengaged from the other opposite orifice.

  According to a first variant embodiment of the invention, in accordance with this second embodiment, said closure chamber is cylindrical with a circular base, said orifices being pierced in two curved wall portions of said chamber on the one hand and another of said outlet, said portions of said inertial closure member being formed by two pistons connected by a rod. Thus, the pistons are able to slide in the chamber to laterally close the orifices pierced laterally in the cylindrical chamber.

  According to a second variant embodiment of the preferred invention, said closure chamber is delimited by an annular sleeve defining an annular chamber, said orifices being pierced in the inner wall of the annular chamber and said closure member consisting of a tubular member slidably mounted in said annular sleeve adapted to close said orifices and having two half-parts separated by a bulkhead and at least two bores spaced a distance less than said third distance opening respectively in said half-parts.

  The two openings being spaced apart by a distance less than said third distance, the overlapping portions which they delimit and which extend on either side of said orifices in opposite directions are they spaced substantially from said fourth distance , greater than the distance separating the orifices. The distances here 6 2860548 considered, must be understood as the average distance, because it is necessary, in certain configurations that simultaneously, the two holes are partially opposite the orifices for the two entries of aspirations are active.

  According to a third embodiment of the invention particularly advantageous, said closure chamber is defined by a cylinder in the wall of which are pierced longitudinally said orifices, and in that it comprises an inner sleeve having at least two holes likely to to be connected by an oblong recess spaced a distance smaller than said third distance and slidably mounted in said cylinder. Thus, the orifices which are spaced apart from one another in the longitudinal direction of the chamber are capable of being closed alternately by means of an internal sleeve in which bores are formed which are able to coincide with the orifices.

  As will be explained in more detail in the following description, according to this third embodiment it is possible to provide said output at one end of said cylinder.

  According to a fourth variant embodiment of the advantageous invention, said inertial closure member consists of a plate pierced with a window, the two solid portions located on either side of said window forming said covering portions. Thus, depending on the direction of acceleration, the plate moves and the window is positioned with respect to the orifice corresponding to the suction inlet which is located in the housing portion to which the oil is driven.

  According to this fourth variant and according to a particular mode of implementation, said orifices open into two portions of surfaces defining the same plane and said inertial closure member consists of a flat plate, thus making it possible to minimize the friction forces. of the plate against said surface portions.

  Other features and advantages of the invention will appear on reading the following description of particular embodiments 2860548 of the invention, given by way of indication but not limitation, with reference to the accompanying drawings in which: Figure 1 is a schematic vertical longitudinal axial sectional view of a feed strainer according to the invention according to a first variant of a first embodiment and in an intermediate position; Figure 2a is a view of the feed strainer shown in Figure 1 in another position; Figure 2b is a cross-sectional view of the strainer shown in Figure 2a along II-II; - Figures 3 and 4 are partial schematic axial longitudinal sectional views of feed strainers according to the invention according to a second variant of the first embodiment; - Figures 5 and 6 are schematic axial longitudinal sectional views of feed strainers according to the invention according to the third variant of the first embodiment; - Figures 7 and 8 are schematic views in longitudinal axial section, respectively vertical and horizontal, first feed strainers according to the invention according to a first variant of a second embodiment; - Figures 9 and 10 are views of second strains strainers supply according to a first variant of the second embodiment; - Figures 11, 12, 13 are schematic views in axial longitudinal section and vertical feed strainers according to the invention according to a second variant of the second embodiment; - Figures 14, 15, 16 and 17 are diagrammatic views in axial longitudinal section and vertical feed strainers according to the invention according to a third variant of the second embodiment; FIGS. 18, 19 and 20 are diagrammatic views in axial and vertical longitudinal section of feed strainers according to the invention according to a fourth variant of the second mode of implementation; Figure 21 is a view of a particular strainer according to the fourth variant illustrated in Figures 18, 19 and 20; and, Figure 22 is a schematic horizontal sectional view of a strainer type as shown in Figures 18, 19 and 20.

  Figure 1 illustrates, a feed strainer 8 according to the invention, extended horizontally in the bottom of an oil sump 10 which is delimited by a bottom wall 12, said strainer being entirely embedded in a sheet of oil. oil 14 which has a horizontal interface 16 with the air.

  The feed strainer 8 is formed of at least one tubular part 15 having a central zone 17 into which an outlet 18 opens and two open ends corresponding to two suction inlets 20, 22 opposite one of the other; the suction inlets 20, 22 being located respectively in two opposite portions 24, 26 of the oil sump 10.

  The feed strainer 8 comprises selective inactivation means constituted firstly of a longitudinal closure chamber 28 extending in said central zone 17 and which is oriented parallel to the mean line which intersects the two inputs. 20, 22. The longitudinal closure chamber 28 has two opposite ends of circular section, each having an outer shoulder 29 and thus forming two shutter orifices 30, 32 opposite in the longitudinal direction and adapted to connect or put in communication , the closure chamber 28 respectively with the entries 20 and 22.

  Furthermore, said tubular piece has two opposite portions 34, 36 on either side of the central zone 17 and beyond the shoulders 29 which extend laterally in opposite directions 9 2860548 from each other . Figure 2b illustrates in section one of the two portions 34, extended laterally.

  In addition, the selective inactivation means comprise an inertial closure member 38 slidably mounted at a determined amplitude in said tubular piece. Said inertial closure member 38 has two ends symmetrical to one another forming two valves 40, 42, connected together by a rod 44. These two valves 40, 42 are spaced apart from each other. a distance greater than the distance separating the two shutoff orifices 30, 32, so that, as soon as one of the valves, 42 for example, bears against the shoulder 29 of the orifice 32, the another valve 40 is spaced from the shoulder 29 of the orifice 30.

  This situation is represented by FIG. 2a on which we find the elements referenced in FIG. 1. On the other hand, this FIG. 2a illustrates a situation in which the casing undergoes an acceleration according to the arrow F, which causes both the drive oil to one of the portions 26 of the oil sump 10 and the drive of the inertial closure member 38 in the direction of the arrow R opposite F and therefore the valve 42 against the shoulder 29 of the orifice 32.

  Thus, one of the suction inlets 20 is still embedded in the oil ply 14 whose interface 16 is inclined while the other suction inlet 22 is in the air and in parallel, the orifice 30, which connects the suction inlet 20 which is located in the opposite direction to the other closure port 32 is released from one of the valves 40 while the other closure port 32, which connects the other suction inlet 22 which is located in a direction opposite to the orifice 30, is closed off by the opposite valve 42.

  In this way, thanks to the extended portions 34 found in Figures 2b and 2a which form a passageway 46 between the valve 40 and the inner wall 48 of said tubular piece, as soon as the orifice of shutter 32 is released from the valve 40, the suction inlet 20 is in communication with the closure chamber 28. Thus, the 2860548 depression created upstream of the outlet 18 by the pump, allows to suck the oil which is located in the portion 26 of the oil sump 10. On the other hand, the other closing orifice which is closed off by the opposite valve 42, prohibits the suction of air through the suction inlet 22.

  Referring to Figures 3 and 4 showing partially two feed strainers according to the invention according to a second variant of the previous mode of implementation.

  Figures 3 and 4 show the tubular part 15 and the central zone 17 in which is formed the longitudinal closing chamber 28 and in which opens the outlet 18. The closure chamber 28 which extends in the zone central 17 has the closing orifices 30, 32.

  In addition, the two opposite ends of the closure chamber 28 have not but shoulders but conical bearing surfaces 19 ', symmetrical to each other, flaring from the closure chamber 28 to two portions opposed 34 'and 36' of the tubular piece 15.

  In Figure 3, the feed strainer comprises an inertial closure member 38 'slidably mounted in the tubular member 15. The inertial closure member 38' has two symmetrical frustoconical tubular ends, one of which another forming two valves 40 ', 42', connected together by a rod 44 'and which extends on either side by a cylindrical free end 49. The cylindrical free ends 49 being slidably mounted respectively against the inner wall of the portions 34 ', 36'.

  These two frustoconical tubular ends 40 ', 42' are adapted to bear respectively against the conical bearing surfaces 19 'to close the orifices 30, 32.

  In addition, in order to allow the flow of the oil when the frustoconical portion is spaced from the conical bearing surface 19 ', radial bores 50 are formed in the two frustoconical tubular ends 40', 42 'at the surface of the 'support.

  FIG. 4 shows an inertial closure member 38 "of the same type as that illustrated in FIG. 3, except that the bearing surfaces of the two frustoconical tubular ends 40 ', 42', in which are arranged the radial holes 50, are concave.

  Note that for these two second variants, the radial bores are formed exclusively in the bearing surface and not in the free surface of the frustoconical tubular ends 40 ', 42', which they close the closure orifices 30, 32.

  Figures 5 and 6 illustrate a third variant of this embodiment Io implementation.

  FIGS. 5 and 6 show a tubular piece 15 'and a central zone 17' in which a longitudinal closure chamber 28 'is formed and into which an outlet 18' opens. The central zone 17 'has two transverse ribs 52, 54, 52', 54 opposite one another and between which the outlet 18 'opens out. The ribs 52, 54, 52 ', 54' protrude into the tubular piece 15 '.

  The closure chamber 28 'extends vertically above the ribs 52, 54, 52', 54.

  In FIG. 5, the inertial closure member consists of a trough plate 56 whose opposite flared walls 58 delimit the closure chamber 28 'and whose flat bottom 60 bears against the inner wall of the tubular piece 15 '; the free ends of the opposed flared walls 58 being in sliding abutment against the inner wall of the opposite tubular piece 15 ', so as to maintain said trough plate 56 which is movable in translation in the tubular piece 15'.

  In addition, the two ribs 52, 54 each have an inclined bearing wall 62 against which the opposite walls 58 are adapted to bear.

  Each of the opposed flared walls 58 has a bore 64 formed in the bearing surface against the bearing wall 62.

  When the trough piece 56 is driven in a direction or in the opposite direction, one of the opposite walls 58 is able to bear against the corresponding support wall 62 to close the orifice 30 'or 32', while the other closure port is cleared, the oil being able to flow through the recess 64.

  In Figure 6, the selective inactivation means differ in that the opposite walls 58 'of the trough piece 56' are perpendicular to the bottom 60 'and the bearing walls 62 are straight.

  While the preceding Figures 1 to 6 illustrate selective inactivation means in which the closure member forms a valve, that is to say it is movable substantially perpendicular to the surface defined by the orifice, the other Figures, 7 to 22, illustrate a second embodiment of the invention wherein the closure member is movable parallel to the surface defined by the orifice.

  Thus, the following selective means of inactivation comprise orifices which open into two surface portions of a closure chamber having the same common curvature, and the inertial closure member has two overlapping portions defining the same curved surface. substantially according to said common curvature, the cover portions being adapted to be driven in translation parallel to said surface portions for closing alternatively said orifices.

  Figures 7 and 8 illustrate the feed strainer in two perpendicular representations, and Figures 9 and 10 show in the same first variant two different embodiments.

  The feed strainers according to this first variant comprise a closure chamber 66 of cylindrical symmetry with a circular base defined by a cylinder 67. The cylinder 67 is pierced with two symmetrical closure holes 68 spaced a determined average distance in two curved wall portions, on either side of an outlet 70.

  Furthermore, the strainers comprise an inertial closure member 72 slidably mounted in the cylinder 67, provided with two pistons 74 adapted to form the overlapping portions and spaced apart by an average distance greater than said determined mean distance, said pistons being connected by a rod 76.

  In addition, each shutoff orifice 68 is adapted to connect the shutter chamber 66 and a corresponding suction inlet 78.

  In this way, the driving of the closure member 72 with respect to the cylinder 67, in one direction or in the other, tends to close the closing orifice 68 opposite to the driving direction and to free the other.

  In addition, in order to facilitate the relative movement of the inertial closure member 72 in the cylinder 67, it is provided with two opposite springs 80 abutting against the pistons.

  According to a second variant, as illustrated in FIGS. 11, 12, 13, the feed strainers comprise an annular or semiannular sleeve 82 defining an annular or semi-annular chamber 84; shutoff orifices 86 being pierced in the inner wall 88 of the annular chamber 84, spaced a first distance apart.

  A closure member 90 consists of a tubular piece which is slidably mounted in the sleeve 82 and which has two half-portions 92, 94 separated by a watertight partition 96. Each of the half-pieces 92, 94 has at least one boring 98 formed in the vicinity of the bulkhead 96 and longitudinally opposite the boring of the other half-part. In addition, the corresponding openings are spaced longitudinally from each other by a second average distance less than the first.

  Furthermore, the half-portions 92, 94 of the closure member 90 are directly connected respectively to suction inlets 100.

  Thus, the drive in translation of the closure member 90, in one direction or in the opposite direction relative to the sleeve 82, also tends to close the closing orifice 86 opposite to the driving direction and to free the other.

  According to another variant, illustrated in FIGS. 14, 15, 16, 17, a closure chamber 110 is delimited by a cylinder 112 or cylinder portions 114, 116, in whose wall or from which are drilled longitudinally. shutoff orifices 118 spaced a third distance apart.

  A closure member 120 consisting of an inner sleeve is slidably mounted in the cylinder 112 or in the cylinder portions 114, 116 and has at least one elongate bore 122 whose two longitudinally opposed edges are spaced a distance apart. less than said third distance or at least two bores 123 spaced a distance less than said third distance.

  The feed strainers illustrated in these Figures 14 to 17 are connectable to an outlet 124 at one end 126 of the cylinder 112 or cylinder portions 114, 116.

  Thus, the oil is able to penetrate radially into the closure chamber 110 and to flow longitudinally through the inner sleeve 120 and through the cylinder 112 to the outlet 124.

  The driving of the inner sleeve 120 in one direction relative to the cylinder 112 tends to obscure the oppositely oriented orifice 118 as it releases the opposite shutter orifice.

  In addition, in the particular case of the strainer shown in FIG. 17, the inner sleeve 120 has a closed end and completely delimits the closure chamber 110.

  Finally, according to a fourth and last variant, illustrated in FIGS. 18 to 22, the feed strainers comprise on the one hand a shut-off chamber 126 into which two shut-off orifices 128 open and on the other hand a sealing member 128. Inertial closure 130 consisting of a plate pierced by a window 132, the two full portions 134, 136 located on either side of said window form covering portions adapted to alternately close the orifices 128.

  The strainers illustrated in Figures 18 and 20 have a projecting central portion 138 which extends through the window 132 and into a bell-shaped complementary portion 140; the plate being mounted slidingly against the edge of the bell portion 140 and the edge of the solid portions 134, 136 being adapted to abut alternately against the projecting central portion 138 in order to release or close the orifices 128.

  The strainer shown in Fig. 19 differs from the previous two in that the projecting central portion does not pass through the window 132 but is flush with the middle plane of the plate and has a window 132 provided with an oil filter screen.

  The strainer illustrated in Figure 22 differs from the previous one in that, overall, it is mounted offset by an angle of 90 so that the plate 130 is vertically disposed.

  Furthermore, the strainer illustrated in FIG. 21 differs from the previous ones in that the surface of the closure chamber in which the closure openings 128 open is curved according to the same radius of curvature and in that the plate 130 is curved. also and mounted in sliding support against said surface. 25

Claims (1)

16 2860548 CLAIMS   1. Feeder for a thermal engine oil pump installed on a motor vehicle, said engine comprising a housing in which the oil can be driven from a housing portion (24) to another opposite portion (26) when said vehicle undergoes an acceleration oriented in the opposite direction, said feed strainer having an outlet (18), two suction inlets (20, 22) opening respectively in said opposite portions (26, 24) of housing and selective means for inactivating said suction inlets, said selective inactivation means comprising, on the one hand, a longitudinal closure chamber (28) oriented according to said housing portions (24, 26), connected to said outlet (18) and intended to be connected by two longitudinally opposed orifices (30, 32) respectively to said suction inlets (20, 22) and on the other hand to an appropriate inertial closure member (38). to be driven in the same direction and the same direction as those of the oil during said acceleration, to release the orifice which connects the suction inlet opening into the crankcase portion to which the oil is driven and to seal the opposite orifice which connects the suction inlet which opens into the opposite housing portion; characterized in that each of the orifices (30,32) of said chamber (28) connects the suction inlet (20,22) which is located in a direction opposite to the other orifice; and in that said inertial closure member (38) is capable of closing the orifice which is oriented in the direction of said acceleration relative to the opposite orifice.   2. Feed strainer according to claim 1, characterized in that said inertial closure member (38) between the position where it closes one of the orifices (30, 32) and the position where it closes the other orifice is 2860548 capable of occupying an intermediate position in which it simultaneously releases the two opposite orifices (30, 32).   3. feed strainer according to claim 1 or 2, characterized in that said orifices (30, 32) are located facing one another and spaced apart by a first distance and in that said member of inertial closure (38) has two opposite ends forming two valves (40, 42) spaced a second distance greater than the first distance, said ends being interconnected by a central portion (44) extending longitudinally and which crosses said orifices (30, 32), said valves being respectively adapted to close alternately said orifices (30, 32).   Feeding strainer according to claim 3, characterized in that it is formed of a tubular piece (15) having two open ends corresponding to said suction inlets (20, 22) and a central zone (17) in which opens out said outlet (18), said central zone (17) having two opposite ends of substantially circular cross section into which respectively open said orifices (30, 32), said facing ends being constituted by two valves (40, 42) and said central portion (44) by a rod connecting said valves (40, 42).   5. A feed strainer according to claim 1 or 2, characterized in that said orifices (68) are spaced a third distance and open into two surface portions of said closure chamber having the same curvature, and in that said inertial closure member (72) has two overlapping portions spaced a fourth distance greater than the third and defining a same curved surface substantially t according to said curvature, said cover portions being adapted to be driven in translation parallel said surface portions for alternately closing said orifices (68).   6. Feed strainer according to claim 5, characterized in that said closure chamber (67) is cylindrical with a circular base, said orifices (68) being pierced in two curved wall portions of said chamber (66) from and further said outlet (70), said portions of said inertial closure member (72) being formed by two pistons (74) connected by a rod (76).   7. Feed strainer according to claim 5, characterized in that said closure chamber is defined by an annular sleeve (82) defining an annular chamber (84), said orifices (86) being pierced in the inner wall of the annular chamber (84) and in that said closure member (90) consists of a tubular piece slidably mounted in said annular sleeve (82) adapted to close said orifices (86) and having two half-portions ( 92, 94) separated by a bulkhead (96) and at least two bores (98) opening respectively into said half-portions (92, 94) and spaced apart by a distance less than the distance between said pierced holes (86) in the inner wall of the annular chamber (84).   8. Feeding strainer according to claim 5, characterized in that said closure chamber is defined by a cylinder (112) in the wall of which are pierced longitudinally said orifices (118, 118), and in that it comprises an inner sleeve (120) slidably mounted in said cylinder (112) and having at least two bores (118) spaced a distance less than the distance between said longitudinally pierced holes (118).   9. Feed strainer according to claim 5, characterized in that said inertial closure member (130) consists of a plate pierced with a window (132), the two solid portions (134, 136) located in both sides of said window (132) forming said cover portions.   10. Feeding strainer according to claim 9, characterized in that said orifices (128) open into two portions of surfaces defining the same plane and in that said inertial closure member (130) consists of a flat plate .