EP1971775B1 - Hydraulic machine, in particular hydraulic motor, with a reciprocating movement, and differential piston for such a machine - Google Patents
Hydraulic machine, in particular hydraulic motor, with a reciprocating movement, and differential piston for such a machine Download PDFInfo
- Publication number
- EP1971775B1 EP1971775B1 EP06841882A EP06841882A EP1971775B1 EP 1971775 B1 EP1971775 B1 EP 1971775B1 EP 06841882 A EP06841882 A EP 06841882A EP 06841882 A EP06841882 A EP 06841882A EP 1971775 B1 EP1971775 B1 EP 1971775B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- section
- casing
- ring
- hydraulic machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 2
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 238000007373 indentation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/22—Arrangements for enabling ready assembly or disassembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/26—Reciprocating-piston liquid engines adapted for special use or combined with apparatus driven thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B5/00—Machines or pumps with differential-surface pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/02—Packing the free space between cylinders and pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
- F04B9/107—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber rectilinear movement of the pumping member in the working direction being obtained by a single-acting liquid motor, e.g. actuated in the other direction by gravity or a spring
Definitions
- a hydraulic motor of this kind is known, for example according to EP-B-0 255 791 , or after US-A-5,505,224 or after EP-B-1 151 196 which represents the closest prior art.
- This hydraulic motor can be used to drive a device for injecting an additive into a main liquid ensuring the operation of the engine.
- each sealing lip is molded in one piece with the corresponding region of the piston.
- the zones of different section of the piston are made separately and then assembled.
- the invention aims, above all, to provide a hydraulic machine of the kind defined above, including a hydraulic motor, the manufacture of the piston is made simpler and easier maintenance.
- a reciprocating hydraulic machine in particular a hydraulic motor, of the kind defined above is characterized in that the sealing lips are provided on removable circular rings, and that the piston is molded of a single room.
- each sealing ring is attached to the piston by a bayonet type assembly.
- radial projections are provided on the inner surface of the ring and corresponding peripheral grooves are provided on the outer surface of the piston, with grooves parallel to the geometric axis of the piston to allow the coming of each projection of the ring to right of a corresponding peripheral groove of the piston.
- the sealing ring for the large section of the piston has a V profile whose concavity is turned towards the small section, and has on the opposite side a frustoconical sealing lip whose diameter increases towards the cover of the envelope.
- the circular ring of the small section of the piston has a V-shaped cross section whose concavity is turned towards the large section.
- a snap of the rings on the piston is provided at the end of rotation of the bayonet assembly.
- the removable circular rings are made of plastic.
- the invention also relates to a differential piston, for a hydraulic machine as defined above, the piston having a large section area and a smaller section area, and being adapted to reciprocally slide respectively in an envelope and in a a barrel coaxial with the casing and smaller diameter, the piston separating two chambers of the casing and being provided at its large section and its small section of sealing lips oriented in opposite directions and turned one towards the other, characterized in that it is molded in one piece and comprises means for assembling with removable circular rings on which the sealing lips are provided
- the assembly means are advantageously of bayonet type and preferably comprise grooves on the outer surface of the piston, with grooves parallel to the geometric axis of the piston to allow radial ribs to come on the inner surface of a piston. sealing ring to the right of a corresponding peripheral groove of the piston.
- the differential piston comprises at least one window for latching at least one ring at the end of assembly to bayonet.
- Fig. 1 and 2 we can see a hydraulic machine constituted by a reciprocating differential hydraulic motor.
- the motor M comprises a casing 1 consisting of a cylindrical body 2 surmounted by a cover 3 assembled to the body 2 in a removable manner, in particular by screwing.
- a differential piston 4 is disposed in the casing 1 to slide in reciprocating motion.
- the piston 4 comprises, in the upper part, a zone 5 of large section, in the form of a ring, the periphery of which bears tightly against the inner wall of the casing 1.
- a substantially cylindrical barrel 6, coaxial with the envelope 1 and smaller diameter than the crown 5 is integral with this crown and extends downwards.
- the lower part of the barrel 6 slides in a sealed manner in a cylindrical housing 7 coaxial with the casing 1.
- the barrel 6 is closed at the bottom by a bottom 6a, constituting the zone of small section of the piston.
- the piston 4 separates the interior volume of the envelope 1 into two chambers, respectively 8 located below the crown 5, and 9 located above the crown 5.
- the chamber 8 is an annular chamber between the envelope 1, the outer surface of the housing 7 and the outer surface of the barrel 6.
- An inlet manifold 10 opens at the bottom of the chamber 8.
- the interior volume of the housing 7 located below the bottom 6a of the piston constitutes a third chamber 11, or outlet chamber, to which is connected an outlet pipe 12 axis orthogonal to that of the casing.
- a cylindrical sleeve 13 coaxial with the casing 1 extends downwards to allow connection to an injection device J of a liquid additive in the outlet chamber 11.
- This injection device is actuated by the motor whose piston 4 is connected by a rod 4r to a pumping means of the additive.
- EP 0 255 791 or EP 1 151 196 we can refer to EP 0 255 791 or EP 1 151 196 .
- Hydraulic switching means C are provided for the supply of liquid and the evacuation of the chambers 8, 9 separated by the piston. These switching means C are controlled by the movements of the piston 4 and comprise a rod 14 acting on a dispensing member 15 which can take two stable positions. In one of the stable positions, the chamber 8 receives the pressurized liquid while the chamber 9 is connected to the outlet 12. In the other position of the dispensing member 15, the chamber 9 receives the liquid under pressure and is isolated from room 11.
- the dispensing member 15 is constituted by a valve holder comprising at least a first valve 16 whose seat is located under the crown 5, the valve 16 having a head located in the chamber 8
- the valve 16 closes moving from bottom to top according to the drawings.
- the dispensing member 15 is provided with at least one other valve 17 whose head is located in the chamber 9.
- the seat of each valve 17 is located on the bottom 6a. The valve 17 closes by a downward movement against its seat.
- the engine further comprises triggering means comprising a pusher 18 capable of causing, at the end of the stroke of the piston, by bearing against a stop, a sudden change in the position of the switching means C under the action of an elastic means E, for reversing the stroke of the piston.
- triggering means comprising a pusher 18 capable of causing, at the end of the stroke of the piston, by bearing against a stop, a sudden change in the position of the switching means C under the action of an elastic means E, for reversing the stroke of the piston.
- the rod 14 is articulated at one end 14a at a point fixed with respect to the piston 4.
- the other end 14b of the rod can move in a vertical window 19 of the valve holder and abut against one of the two ends of this window, in one of the two stable positions of the dispensing member 15.
- the resilient means E is integral at each of its ends with a hinge member 20a, 20b respectively received in a housing 21 provided on the link and 22 on another moving part of the machine, namely the pusher 18 in the example shown.
- Each housing 21, 22 is open in a direction substantially opposite to the direction of the force exerted by the resilient means E in the wall of the housing considered.
- the disassembly of the articulation member 20a, 20b of its housing is effected by a simple translational movement exerting a force contrary to that of the elastic means E.
- the holding of the articulation members 20a, 20b in their housing is ensured by the effort developed by the elastic means E.
- This elastic means E is advantageously constituted by a leaf spring 23 substantially arc-shaped convex curve, in particular substantially in a semicircle.
- the blade 23 is integral at each end of a cylindrical pin orthogonal to the plane of the curve arc, this pin constituting the articulation member 20a, 20b.
- the leaf spring 23 is made of plastic material, and is molded in one piece with the cylindrical pins 20a, 20b.
- the spring blade 23 turns its convexity on the opposite side to the bottom 6a of the piston.
- the link 14 is articulated, at its end 14a remote from the housing 21 receiving the pin 20a, in a notch 24 ( Fig.6 ), fixed with respect to the piston 4.
- the rod 14 ( Fig.2 and 6 ) is advantageously formed by two parallel elementary links 25, 26 interconnected by a cross member 27 closer to the end 14b than the other end 14a.
- the ends of the rods 25 and 26 forming the end 14b have a cylindrical shape of geometric axis orthogonal to the longitudinal direction of the rods.
- Each of these cylindrical ends comprises a housing 21 facing the other elementary rod, and open on the opposite side to the end 14a.
- Each housing 21 receives an end of the peg 20a which protrudes transversely on both sides of the blade 23.
- a snap of the pin 20a in the housing 21 is provided.
- Each elementary rod 25, 26 has two parallel branches between which is provided at the end 14a, a hinge pin 28 received in the notch 24 of the piston.
- An axle 28 is provided for each elementary link 25, 26.
- Each axis 28 is molded in one piece with the two branches of the elementary link.
- the two elementary links 25, 26 are molded in one piece with the cross member 27 so that the rod 14 is constituted by a single piece of plastic material.
- the indentations 24 of articulation on the piston form a housing substantially in a semicircle for free engagement of an axis 28.
- the notches 24 are provided in walls 29,30 parallel to each other and to the geometric axis of the piston, equidistant from these walls.
- the spacing between the walls 29, 30 is equal to the spacing between the hinge pins 28 of the two elementary links, while the thickness of the walls 29, 30 is smaller than the distance between the internal faces of the two parallel branches. of the same elementary link.
- Each wall 29, 30 is framed by two parallel branches of a single elementary rod.
- Each notch 24 is open in the opposite direction to the force exerted by the resilient blade 23 on the rod 14, which force pushes and maintains each axis 28 bearing against the bottom of the notch 24.
- the axle 28 is simply engaged in the notch 24, preferably without snapping.
- the assembly and disassembly of the link 14, with its two axes 28 respectively in the indentations 24, are particularly simple and fast.
- the pusher 18, as visible on Fig.6 comprises a rod 31, for example of cruciform section, guided in sliding in a well 32 ( Fig.2 ) of the piston.
- the rod 31 comprises, substantially mid-length, a groove 33 for receiving an O-ring 34 providing a tight sliding in the well 32.
- the upper end of the rod 18 is integral with a frame 35 having a transverse base integral with the upper end of the rod 18.
- the frame 35 also comprises two longitudinal walls 35a, 35b, parallel to the geometric axis of the rod 18, flanking the resilient blade 23 and connected at the top by a crossmember 36.
- Each wall 35a, 35b has at its base integral with the rod 18 a recess 22 substantially in a semicircle, opening on the opposite side to the rod 14.
- Each notch 22 receives one end of the hinge pin 20b, preferably snapped.
- Frame 35 forms a a kind of gantry and the crossbar 36 at the top is the high abutment of the pusher.
- the ends of the blade 23 preferably have a reduced width which determines the minimum allowable gap between the facing faces of the inner end walls of the housing 21 or 22.
- the pusher 18 with its frame 35 is also made of a single piece of plastic material.
- the mounting or dismounting of the pin 20b in the housings 22 is particularly simple and fast, by elastic deformation of the blade 23.
- the two longitudinal walls 35a, 35b of the gantry 35 comprise outwards, on either side of the zones provided with the indentations 22, protrusions 37, for example in the shape of a truncated pyramid, bounded by a planar top face parallel to the geometric axis of the rod 31 and orthogonal to the pin 20b.
- the projections 37 are adapted to cooperate with walls 38 ( Fig.5 and 6 ) in the form of a straight dihedral, integral with the piston, guiding the gantry 35.
- the walls 38 are connected to the walls 30 along an edge parallel to the axis of the piston, on the opposite side to the indentations 24.
- the valves 16, 17 are mounted on the valve holder 15 ( Fig.6 ) having substantially the shape of a frame 39, vertical in engine operating position, having on its two vertical sides ribs 40 projecting outwards, adapted to cooperate with guide grooves (not visible) provided in the piston 4.
- the lower horizontal side of the frame 39 has two open housings 41 allowing a hitch, snap-fitting of the cylindrical rod of a valve 17, by a translation perpendicular to the plane of the frame 39.
- the lower edges of each housing 41 are housed , with a certain clearance in a direction parallel to the axis of the piston, between two flanges or disks 42a, 42b ( Fig.4 ) integral with the valve stem.
- the valve itself is constituted by a disk having at its periphery a groove 43 ( Fig.4 ) to receive a seal.
- valves 17 are provided on the bottom 6a of small section of the piston 4.
- the valves 17 are located on the side of the rod 14 relative to the piston 4.
- the upper horizontal side of frame 39 extends beyond the vertical uprights of the frame and comprises, at each end, a laterally open housing 44 with a cross-section greater than a semicircle for receiving a cylindrical rod 45 ( Fig.4 )
- the rod 45 comprises two collars radially projecting between which is housed the wall of the housing 44.
- Two valves 16 are provided to which correspond two seats 45 on the large section 5 of the piston, symmetrically with respect to a plane passing through the axis of the piston and orthogonal to the axis of pivoting of the rod 14.
- valves 16 are oriented with their rod 45 directed upwards which is engaged through the opening of the seat to be hooked to the housing 44, on the same side of the large section 5 as the rod 14.
- the valve holder 15, 39 advantageously comprises, on its upper horizontal side, a stirrup 46 projecting upwardly flanking, by its lateral wings, the elastic blade 23 ( Fig.5 ).
- This stirrup 46 is designed to ensure, when it comes into abutment against the lid 3 of the envelope, for example as a result of a failure of a part of the engine, a machine operation in bypass (bypass) , the valves being kept open.
- the valve holder 15, 39 forms a single piece which can be made of molded plastic.
- Columns 47 three for example, having a cross-section with three branches, integral with the large section 5 of the piston, project upwards parallel to the axis of the piston and are distributed at 120 ° to one of the other in the vicinity of the periphery of the piston.
- the posts 47 constitute mechanical safety stops against the cover 3 of the envelope in the event of breakage of a part or overhead, the height of these posts 47 being provided accordingly.
- the piston 4 is provided, at its large section and small section, with sealing lips 48, 49 ( Fig.6 and 7 ) turned towards each other.
- the sealing lips 48, 49 are provided on removable circular sealing rings 50, 51, clearly visible on Fig.7 .
- the piston 4 can thus be molded in one piece, advantageously made of plastic.
- Each sealing ring 50, 51 is advantageously fixed to the piston 4 by a bayonet type assembly having radial projections 52, 53 on the inner surface of the respective rings 50, 51.
- the projections 52, 53 are adapted to cooperate with corresponding peripheral grooves 54, 55 provided on the outer surface of the large section and the small section of the piston.
- Clearances 56, 57 generatrices parallel to the axis of the piston are provided on the outer periphery of the large and small sections to allow to bring the radial projections 52, 53 opposite the inlet of the peripheral grooves 54, 55 by a translation movement parallel to the axis of the piston.
- the sealing ring 50 provided at the large section of the piston has a V-shaped profile whose concavity is turned towards the small section, that is to say downwards according to the representation of the drawings.
- This V-shaped profile is limited on the outside by the lip 48 which seals against the wall of the casing and, on the inside, by a slightly frustoconical lip 58 which seals against the piston.
- the ring 50 comprises, on the opposite side to the lips 48, 58, another frustoconical sealing lip 59 turned in the opposite direction, the diameter of which increases towards the cover of the casing.
- This lip 59 provides protection of the sealing zone between the piston and the envelope, at the level of the lip 48, against a fallout of abrasive particles.
- the circular ring 51 of the small section of the piston has a V-shaped cross section whose concavity is turned towards the large section, that is to say upwards according to Fig.7 .
- the outer arm of the V forms the sealing lip 49 between piston and casing.
- the outer wall of the piston 4, as visible on Fig.6 has two recessed areas such as 4a, extending under the seats of the valves 16 and allowing their vertical reciprocating movements.
- the motor M can be mounted in the following manner. Sealing rings 50,51, shown on Fig.7 , can be assembled to the piston 4, by the bayonet attachment, before placing the valves.
- a subset ( Fig. 6 ) can be constituted by engaging the pin 20b of the resilient blade 23 in the notches 22 of the pusher 18, while the pin 20a is engaged in the housing 21 of the rod 14.
- This subassembly can then be put in place in the piston 4 by engaging the rod 31 of the pusher 18 in the guide well 32 and engaging the pins 28 of the rod 14 in the notches 24.
- valve holder 15,39 is prepared from the valve holder 15,39 in the lower part of which are snapped the valves 17.
- the valve holder 15,39 is then engaged in the piston 4 in a downward movement vertically by introducing the ribs 40 into the corresponding guide grooves of the piston.
- valves 16 with their upwardly directed rods are then presented below the crown 5.
- the stem 45 of each valve 16 is then passed through the opening of the corresponding seat in order to snap the upper end of this rod. in the housing 44 of the valve holder 15,39.
- the operation of the motor is similar to that described in EP 151,196 and will only be briefly recalled with reference to Fig. 1 where the piston 4 is in ascending stroke.
- the pressurized liquid generally water, arrives through the inlet 10.
- the valves 16 are closed while the valves 17 are open, allowing the liquid to flow from the chamber 9 to the chamber 11 and the outlet 12.
- the pusher 18 comes to bear against an abutment linked to the cover 13, which causes under the effect of the leaf spring 23 the tilting of the link 14 towards the other low stable position, with movement of the door valves 15 to the bottom 6a of the piston.
- the valves 17 close while the valves 16 open.
- the pressurized liquid passes into the closed chamber 9 and the movement of the piston is reversed.
- the pusher 18 At the end of the downward stroke, the pusher 18 at its lower end meets an abutment G secured to the casing, which causes a new tilting of the rod 14 towards the raised position and a displacement of the valve holder 15 causing the closing of the valves 16 and the opening of the valves 17.
- the movement of the piston 5 is reversed again and the piston starts up again.
- Fig.11 illustrates an alternative embodiment of the pusher 18, the rod 31a is made in two parts 31b, 31c assembled removably.
- the upper part 31b extends downwards by a cylindrical shaft 31 d of outside diameter smaller than that of the upper part of 31b.
- the lower part 31c is cylindrical tubular to receive the shaft 31d.
- a lock is provided between the two parts, in particular by a bayonet system 31e, 31f provided at the lower end of the parts.
- the pusher seal is advantageously constituted by a ring 34a made of plastic material with a V-shaped section, with a double lip similar to the ring 51, but of smaller diameter.
- the concavity of the V is preferably turned upwards.
- the ring 34a is mounted on the lower part 31c with a quarter-turn bayonet fastening system, similar to that described with respect to the Fig.7 to 9 .
- This arrangement allows an easy change of the ring 34c in case of wear and a choice of plastic for the ring 34a, having a good chemical inertia with respect to the liquids passing through the motor and the metering device.
- Fig.12 illustrates an alternative embodiment of the removable sealing rings 50, 51.
- a snap rings 50,51 on the piston 4 is provided at the end of rotation of the bayonet assembly.
- the ring 50 has a radially inward projection 52a provided at one end of a rib 52.
- a corresponding window 52b is provided in the side wall of the piston so that at the end of rotation of the assembly, the projection 52a enters the window 52b.
- a locking rotation of the ring 50 is thus achieved and prevents undesirable disassembly of the ring 50 in operation.
- To remove the ring 50 using a tool is pushed from inside, through the window 52b, the projection 52a outwardly to disengage the window.
- the hydraulic motor more generally the hydraulic machine, according to the invention can be made entirely of plastic, including the elastic means E formed by the blade 23, and has a high resistance to chemicals without any metal parts.
- the sealing ring 50 of the large section of the piston incorporates a protective lip 59.
- the removable sealing rings 50, 51 make it possible to maintain the opposite sealing directions in order to obtain the injection of the additive product entering through the sleeve 13. in the exit chamber 11.
- the mechanism for controlling the tilting of the rod 14 and the change of position of the valve holder 15, 39 is particularly simple of the three-point type.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Details Of Reciprocating Pumps (AREA)
- Hydraulic Motors (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
Description
L'invention est relative à une machine hydraulique, en particulier un moteur hydraulique, machine du genre de celles qui comprennent :
- une enveloppe ;
- un piston différentiel présentant une zone à grande section et une zone à plus petite section, propre à coulisser en mouvement alternatif respectivement dans l'enveloppe et dans un logement coaxial à l'enveloppe et de plus petit diamètre, le piston séparant deux chambres de l'enveloppe ;
- des moyens de commutation hydraulique pour l'alimentation en liquide et l'évacuation des chambres séparées par le piston, ces moyens de commutation étant commandés par les déplacements du piston et pouvant prendre deux positions stables ;
- et des moyens de déclenchement propres à provoquer, en fin de course du piston, un changement brusque de la position des moyens de commutation, sous l'action d'un moyen élastique, pour l'inversion de la course,
le piston étant muni au niveau de sa grande section et de sa petite section de lèvres d'étanchéité orientées en sens opposé et tournées l'une vers l'autre,
- an envelope ;
- a differential piston having a zone with a large section and a zone with a smaller section, capable of reciprocatingly sliding respectively in the envelope and in a housing coaxial with the envelope and of smaller diameter, the piston separating two chambers of the envelope;
- hydraulic switching means for supplying liquid and discharging the chambers separated by the piston, these switching means being controlled by the movements of the piston and being able to assume two stable positions;
- and triggering means capable of causing, at the end of the piston stroke, a sudden change in the position of the switching means, under the action of an elastic means, for the reversal of the stroke,
the piston being provided at its large section and its small section of sealing lips oriented in opposite directions and facing each other,
Un moteur hydraulique de ce genre est connu, par exemple d'après
Dans les moteurs connus, chaque lèvre d'étanchéité est moulée d'une seule pièce avec la zone correspondante du piston. Les zones de section différente du piston sont réalisées séparément puis assemblées. Bien que cette solution donne satisfaction pour l'étanchéité et le fonctionnement, elle manque de souplesse pour la fabrication et la maintenance. Pratiquement, lorsqu'une lèvre d'étanchéité est abîmée, il faut changer au moins la partie correspondante du piston et, généralement, l'ensemble du pistonIn known engines, each sealing lip is molded in one piece with the corresponding region of the piston. The zones of different section of the piston are made separately and then assembled. Although this solution is satisfactory for sealing and operation, it lacks flexibility for manufacturing and maintenance. Practically, when a sealing lip is damaged, it is necessary to change at least the corresponding part of the piston and, generally, the entire piston
L'invention a pour but, surtout, de fournir une machine hydraulique du genre défini précédemment, notamment un moteur hydraulique, dont la fabrication du piston soit rendue plus simple et la maintenance facilitée.The invention aims, above all, to provide a hydraulic machine of the kind defined above, including a hydraulic motor, the manufacture of the piston is made simpler and easier maintenance.
Il est souhaitable également d'améliorer les conditions dans lesquelles l'étanchéité entre les différentes sections du piston et la paroi de l'enveloppe ou du logement est réalisée.It is also desirable to improve the conditions under which the sealing between the different sections of the piston and the wall of the envelope or housing is achieved.
Selon l'invention, une machine hydraulique à mouvement alternatif, en particulier un moteur hydraulique, du genre défini précédemment est caractérisée en ce que les lèvres d'étanchéité sont prévues sur des bagues circulaires démontables, et que le piston est moulé d'une seule pièce.According to the invention, a reciprocating hydraulic machine, in particular a hydraulic motor, of the kind defined above is characterized in that the sealing lips are provided on removable circular rings, and that the piston is molded of a single room.
Avantageusement, chaque bague d'étanchéité est fixée au piston par un assemblage du type à baïonnette. De préférence, des saillies radiales sont prévues sur la surface interne de la bague et des rainures périphériques correspondantes sont prévues sur la surface externe du piston, avec rainures parallèles à l'axe géométrique du piston pour permettre la venue de chaque saillie de la bague au droit d'une rainure périphérique correspondante du piston.Advantageously, each sealing ring is attached to the piston by a bayonet type assembly. Preferably, radial projections are provided on the inner surface of the ring and corresponding peripheral grooves are provided on the outer surface of the piston, with grooves parallel to the geometric axis of the piston to allow the coming of each projection of the ring to right of a corresponding peripheral groove of the piston.
De préférence, la bague d'étanchéité pour la grande section du piston présente un profil en V dont la concavité est tournée du côté de la petite section, et comporte du côté opposé une lèvre d'étanchéité tronconique dont le diamètre augmente en direction du couvercle de l'enveloppe.Preferably, the sealing ring for the large section of the piston has a V profile whose concavity is turned towards the small section, and has on the opposite side a frustoconical sealing lip whose diameter increases towards the cover of the envelope.
La bague circulaire de la petite section du piston présente une section transversale en forme de V dont la concavité est tournée du côté de la grande section.The circular ring of the small section of the piston has a V-shaped cross section whose concavity is turned towards the large section.
De préférence, un encliquetage des bagues sur le piston est prévu en fin de rotation de l'assemblage à baïonnette.Preferably, a snap of the rings on the piston is provided at the end of rotation of the bayonet assembly.
Avantageusement, les bagues circulaires démontables sont réalisées en matière plastique.Advantageously, the removable circular rings are made of plastic.
L'invention est également relative à un piston différentiel, pour une machine hydraulique telle que définie précédemment, le piston présentant une zone à grande section et une zone à plus petite section, et étant propre à coulisser en mouvement alternatif respectivement dans une enveloppe et dans un fût coaxial à l'enveloppe et de plus petit diamètre, le piston séparant deux chambres de l'enveloppe et étant muni au niveau de sa grande section et de sa petite section de lèvres d'étanchéité orientées en sens opposé et tournées l'une vers l'autre, caractérisé en ce qu'il est moulé d'une seule pièce et comporte des moyens d'assemblage avec des bagues circulaires démontables sur lesquelles sont prévues les lèvres d'étanchéitéThe invention also relates to a differential piston, for a hydraulic machine as defined above, the piston having a large section area and a smaller section area, and being adapted to reciprocally slide respectively in an envelope and in a a barrel coaxial with the casing and smaller diameter, the piston separating two chambers of the casing and being provided at its large section and its small section of sealing lips oriented in opposite directions and turned one towards the other, characterized in that it is molded in one piece and comprises means for assembling with removable circular rings on which the sealing lips are provided
Les moyens d'assemblage sont avantageusement du type à baïonnette et comportent, de préférence, des rainures sur la surface externe du piston, avec rainures parallèles à l'axe géométrique du piston pour permettre la venue de nervures radiales sur la surface interne d'une bague d'étanchéité au droit d'une rainure périphérique correspondante du piston.The assembly means are advantageously of bayonet type and preferably comprise grooves on the outer surface of the piston, with grooves parallel to the geometric axis of the piston to allow radial ribs to come on the inner surface of a piston. sealing ring to the right of a corresponding peripheral groove of the piston.
Avantageusement, le piston différentiel comporte au moins une fenêtre pour l'encliquetage d'au moins une bague en fin d'assemblage à baïonnette.Advantageously, the differential piston comprises at least one window for latching at least one ring at the end of assembly to bayonet.
L'invention consiste, mises à part les dispositions exposées ci-dessus, en un certain nombre d'autres dispositions dont il sera plus explicitement question ci-après à propos d'un exemple de réalisation décrit avec référence aux dessins annexés, mais qui n'est nullement limitatif. Sur ces dessins :
-
Fig. 1 est une représentation schématique simplifiée en coupe verticale d'un moteur hydraulique selon l'invention. -
Fig. 2 est une vue en perspective, en coupe verticale, d'un moteur hydraulique selon l'invention. -
Fig. 3 est une coupe verticale partielle du moteur hydraulique suivant la ligne III-III deFig. 4 . -
Fig. 4 est une coupe verticale partielle suivant la ligne IV-IV deFig. 3 . -
Fig. 5 est une vue en perspective du piston différentiel avec clapets, porte-clapets, moyen élastique et poussoir en place. -
Fig. 6 est une vue en perspective éclatée du piston deFig. 5 et des différentes pièces démontées. -
Fig. 7 est une vue en perspective éclatée du piston seul et des joints démontés. -
Fig. 8 est une vue de dessous du joint de la grande section du piston. -
Fig. 9 est une coupe suivant la ligne IX-IX deFig. 8 . -
Fig. 10 est une coupe verticale du joint de la petite section du piston. -
Fig.11 est une vue en perspective d'une variante de réalisation du poussoir en deux parties en cours d'assemblage, et -
Fig.12 est une vue en perspective éclatée, semblable àFig.7 , d'une variante de réalisation du piston et des joints.
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Fig. 1 is a simplified schematic representation in vertical section of a hydraulic motor according to the invention. -
Fig. 2 is a perspective view, in vertical section, of a hydraulic motor according to the invention. -
Fig. 3 is a partial vertical section of the hydraulic motor along line III-III ofFig. 4 . -
Fig. 4 is a partial vertical section along line IV-IV ofFig. 3 . -
Fig. 5 is a perspective view of the differential piston with valves, valve holder, elastic means and push in place. -
Fig. 6 is an exploded perspective view of the piston ofFig. 5 and different parts disassembled. -
Fig. 7 is an exploded perspective view of the piston alone and disassembled seals. -
Fig. 8 is a view from below of the seal of the large section of the piston. -
Fig. 9 is a section along line IX-IX ofFig. 8 . -
Fig. 10 is a vertical section of the seal of the small section of the piston. -
Fig.11 is a perspective view of an alternative embodiment of the pusher in two parts during assembly, and -
Fig.12 is an exploded perspective view, similar toFig.7 , an alternative embodiment of the piston and seals.
En se reportant aux dessins, notamment aux
Le moteur M comprend une enveloppe 1 constituée d'un corps cylindrique 2 surmonté d'un couvercle 3 assemblé au corps 2 de manière démontable, notamment par vissage.The motor M comprises a casing 1 consisting of a
Un piston différentiel 4 est disposé dans l'enveloppe 1 pour coulisser en mouvement alternatif. Le piston 4 comporte, en partie haute, une zone 5 de grande section, en forme de couronne, dont la périphérie est en appui de manière étanche contre la paroi interne de l'enveloppe 1. Un fût 6 sensiblement cylindrique, coaxial à l'enveloppe 1 et de plus petit diamètre que la couronne 5 est solidaire de cette couronne et s'étend vers le bas. La partie inférieure du fût 6 coulisse de manière étanche dans un logement cylindrique 7 coaxial à l'enveloppe 1. Le fût 6 est fermé en partie basse par un fond 6a, constituant la zone de petite section du piston.A
Le piston 4 sépare le volume intérieur de l'enveloppe 1 en deux chambres, respectivement 8 située au-dessous de la couronne 5, et 9 située au-dessus de la couronne 5. La chambre 8 est une chambre annulaire comprise entre l'enveloppe 1, la surface extérieure du logement 7 et la surface extérieure du fût 6. Une tubulure d'entrée 10 débouche en partie basse de la chambre 8. Le volume intérieur du logement 7 situé au-dessous du fond 6a du piston constitue une troisième chambre 11, ou chambre de sortie, à laquelle est raccordée une tubulure de sortie 12 d'axe orthogonal à celui de l'enveloppe.The
Un manchon cylindrique 13 coaxial à l'enveloppe 1 s'étend vers le bas pour permettre le raccordement à un dispositif d'injection J d'un additif liquide dans la chambre 11 de sortie. Ce dispositif d'injection est actionné par le moteur dont le piston 4 est relié par une tige 4r à un moyen de pompage de l'additif. Pour plus de détails concernant ce type de moteur on pourra se reporter à
Des moyens de commutation hydraulique C sont prévus pour l'alimentation en liquide et l'évacuation des chambres 8, 9 séparées par le piston. Ces moyens de commutation C sont commandés par les déplacements du piston 4 et comportent une biellette 14 agissant sur un organe de distribution 15 pouvant prendre deux positions stables. Dans l'une des positions stables, la chambre 8 reçoit le liquide sous pression tandis que la chambre 9 est reliée à la sortie 12. Dans l'autre position de l'organe de distribution 15, la chambre 9 reçoit le liquide sous pression et est isolée de la chambre 11.Hydraulic switching means C are provided for the supply of liquid and the evacuation of the
Dans l'exemple représenté sur les dessins, l'organe de distribution 15 est constitué par un porte-clapets comprenant au moins un premier clapet 16 dont le siège est situé sous la couronne 5, le clapet 16 ayant une tête située dans la chambre 8. Le clapet 16 se ferme en se déplaçant de bas en haut selon les dessins. L'organe de distribution 15 est muni d'au moins un autre clapet 17 dont la tête est située dans la chambre 9. Le siège de chaque clapet 17 est situé sur le fond 6a. Le clapet 17 se ferme par un mouvement de descente contre son siège.In the example shown in the drawings, the dispensing
Le moteur comporte en outre des moyens de déclenchement comprenant un poussoir 18 propre à provoquer, en fin de course du piston, par venue en appui contre une butée, un changement brusque de la position des moyens de commutation C sous l'action d'un moyen élastique E, pour l'inversion de la course du piston.The engine further comprises triggering means comprising a
La biellette 14 est articulée à une extrémité 14a sur un point fixe par rapport au piston 4. L'autre extrémité 14b de la biellette peut se déplacer dans une fenêtre verticale 19 du porte-clapets et venir en butée contre l'une des deux extrémités de cette fenêtre, dans l'une des deux positions stables de l'organe de distribution 15.The
Selon l'invention comme visible sur
Ce moyen élastique E est avantageusement constitué par une lame ressort 23 sensiblement en forme d'arc de courbe convexe, notamment sensiblement en demi-cercle. La lame 23 est solidaire à chaque extrémité d'un pion cylindrique orthogonal au plan de l'arc de courbe, ce pion constituant l'organe d'articulation 20a, 20b.This elastic means E is advantageously constituted by a
De préférence, la lame ressort 23 est réalisée en matière plastique, et est moulée d'une seule pièce avec les pions cylindriques 20a, 20b. La lame ressort 23 tourne sa convexité du côté opposé au fond 6a du piston.Preferably, the
La biellette 14 est articulée, à son extrémité 14a éloignée du logement 21 recevant le pion 20a, dans une échancrure 24 (
La biellette 14 (
Chaque biellette élémentaire 25, 26 comporte deux branches parallèles entre lesquelles est prévu, à l'extrémité 14a, un axe d'articulation 28 reçu dans l'échancrure 24 du piston. Un axe 28 est prévu pour chaque biellette élémentaire 25, 26. Chaque axe 28 est moulé d'une seule pièce avec les deux branches de la biellette élémentaire. Les deux biellettes élémentaires 25, 26 sont moulées d'une seule pièce avec la traverse 27 de sorte que la biellette 14 est constituée par une pièce unique en matière plastique.Each
Les échancrures 24 d'articulation sur le piston forment un logement sensiblement en demi-cercle pour un engagement libre d'un axe 28. Les échancrures 24 sont prévues dans des parois 29,30 parallèles entre elles et à l'axe géométrique du piston, équidistant de ces parois. L'écartement entre les parois 29, 30 est égal à l'écartement entre les axes d'articulation 28 des deux biellettes élémentaires, tandis que l'épaisseur des parois 29, 30 est inférieure à la distance entre les faces internes des deux branches parallèles d'une même biellette élémentaire. Chaque paroi 29, 30 est encadrée par deux branches parallèles d'une même biellette élémentaire.The
Chaque échancrure 24 est ouverte dans le sens opposé à l'effort exercé par la lame élastique 23 sur la biellette 14, effort qui pousse et maintient chaque axe 28 en appui contre le fond de l'échancrure 24. L'axe 28 est simplement engagé dans l'échancrure 24, de préférence sans encliquetage. Le montage et le démontage de la biellette 14, avec ses deux axes 28 respectivement dans les échancrures 24, sont particulièrement simples et rapides.Each
Le poussoir 18, comme visible sur
Les extrémités de la lame 23 ont de préférence une largeur réduite qui détermine l'écartement minimal admissible entre les faces en regard des parois intérieures d'extrémité des logements 21 ou 22.The ends of the
Le poussoir 18 avec son cadre 35 est également réalisé d'une seule pièce en matière plastique. Le montage ou le démontage du pion 20b dans les logements 22 est particulièrement simple et rapide, par déformation élastique de la lame 23.The
Les deux parois longitudinales 35a, 35b du portique 35 comportent vers l'extérieur, de part et d'autre des zones munies des échancrures 22, des saillies 37, par exemple en forme de tronc de pyramide, limitées par une face sommitale plane parallèle à l'axe géométrique de la tige 31 et orthogonale au pion 20b. Les saillies 37 sont propres à coopérer avec des parois 38 (
Les clapets 16, 17 sont montés sur le porte-clapets 15 (
Les sièges respectifs des clapets 17 sont prévus sur le fond 6a de petite section du piston 4. Les clapets 17 sont situés du côté de la biellette 14 par rapport au piston 4.The respective seats of the
Le côté horizontal supérieur du cadre 39 (
Les clapets 16 sont orientés avec leur tige 45 dirigée vers le haut qui est engagée à travers l'ouverture du siège pour être accrochée au logement 44, du même côté de la grande section 5 que la biellette 14. Lorsque le couvercle 3 est démonté, il est possible d'accéder aux tiges 45 des clapets 16 pour les engager dans les logements 44, ou les en dégager.The
Le porte-clapets 15, 39 comporte avantageusement, sur son côté horizontal supérieur, un étrier 46 en saillie vers le haut encadrant, par ses ailes latérales, la lame élastique 23 (
Le porte-clapets 15, 39 forme une pièce unique qui peut être réalisée en matière plastique moulée.The
Des colonnettes 47, trois par exemple, à section transversale en étoile à trois branches, solidaires de la grande section 5 du piston, font saillie vers le haut parallèlement à l'axe du piston et sont réparties à 120° l'une de l'autre au voisinage de la périphérie du piston. Les colonnettes 47 constituent des butées mécaniques de sécurité contre le couvercle 3 de l'enveloppe en cas de rupture d'une pièce ou d'un surdébit, la hauteur de ces colonnettes 47 étant prévue en conséquence.
Le piston 4 est muni, au niveau de sa grande section et de sa petite section, de lèvres d'étanchéité 48, 49 (
Les lèvres d'étanchéité 48, 49 sont prévues sur des bagues d'étanchéité circulaires démontables 50, 51, bien visibles sur
Chaque bague d'étanchéité 50, 51 est avantageusement fixée au piston 4 par un assemblage du type à baïonnette comportant des saillies radiales 52, 53 sur la surface interne des bagues respectives 50, 51. Les saillies 52, 53 sont propres à coopérer avec des rainures périphériques correspondantes 54, 55 prévues sur la surface externe de la grande section et de la petite section du piston. Des dégagements 56, 57 à génératrices parallèles à l'axe du piston sont prévus sur la périphérie extérieure des grande et petite sections pour permettre d'amener les saillies radiales 52, 53 en face de l'entrée des rainures périphériques 54, 55 par un mouvement de translation parallèle à l'axe du piston. Puis, par une rotation autour de cet axe du piston, les nervures 52, 53 sont engagées dans les rainures 54, 55 avec blocage de la bague d'étanchéité correspondante 50, 51. Le démontage des bagues 50, 51 s'effectue rapidement par un mouvement inverse.Each sealing
Comme visible sur
La bague 50 comporte, du côté opposé aux lèvres 48,58 une autre lèvre d'étanchéité 59 tronconique tournée en sens opposé, dont le diamètre augmente en direction du couvercle de l'enveloppe. Cette lèvre 59 assure une protection de la zone d'étanchéité entre piston et enveloppe, au niveau de la lèvre 48, contre une retombée de particules abrasives.The
La bague circulaire 51 de la petite section du piston présente une section transversale en forme de V dont la concavité est tournée du côté de la grande section, c'est-à-dire vers le haut selon
La paroi extérieure du piston 4, comme visible sur
Le montage du moteur M peut être effectué de la manière suivante. Les bagues d'étanchéité 50,51, montrées sur
Un sous-ensemble (
Le maintien de la lame 23, par encliquetage du pion 20a dans les logements 21 de la biellette et du pion 20b dans les échancrures 22, facilite la manipulation du sous-ensemble (biellette 14 - lame élastique 23 - poussoir 18) lors du montage.Maintaining the
Un autre sous-ensemble est préparé à partir du porte-clapets 15,39 dans la partie inférieure duquel sont encliquetés les clapets 17. Le porte-clapets 15,39 est ensuite engagé dans le piston 4 selon un mouvement de descente verticale en introduisant les nervures 40 dans les rainures de guidage correspondantes du piston.Another subassembly is prepared from the
Les clapets 16 avec leurs tiges dirigées vers le haut sont ensuite présentés au-dessous de la couronne 5. On fait ensuite passer la tige 45 de chaque clapet 16 par l'ouverture du siège correspondant afin d'encliqueter l'extrémité supérieure de cette tige dans le logement 44 du porte-clapets 15,39.The
L'ensemble du piston, du poussoir, de la biellette et du porte-clapets est réalisé. Il suffit alors d'engager le piston dans le corps 2, puis d'assembler le couvercle 3 au corps 2 par vissage.The entire piston, the pusher, the connecting rod and the valve holder is made. It is then sufficient to engage the piston in the
Les opérations de démontage ou de remplacement de pièces défaillantes se déduisent des explications précédentes et sont extrêmement simples et rapides.The dismantling or replacement of faulty parts are deduced from the previous explanations and are extremely simple and fast.
Le fonctionnement du moteur est semblable à celui décrit dans
En fin de course ascendante, le poussoir 18 vient en appui contre une butée liée au couvercle 13, ce qui provoque sous l'effet de la lame ressort 23 le basculement de la biellette 14 vers l'autre position stable basse, avec déplacement du porte-clapets 15 vers le fond 6a du piston. Les clapets 17 se ferment tandis que les clapets 16 s'ouvrent. Le liquide sous pression passe dans la chambre 9 fermée et le mouvement du piston est inversé.At the end of the upward stroke, the
En fin de course descendante, le poussoir 18 par son extrémité inférieure rencontre une butée G solidaire de l'enveloppe, ce qui provoque un nouveau basculement de la biellette 14 vers la position relevée et un déplacement du porte-clapets 15 entraînant la fermeture des clapets 16 et l'ouverture des clapets 17. Le mouvement du piston 5 est de nouveau inversé et le piston repart en course montante.At the end of the downward stroke, the
Une disposition semblable est prévue pour la bague inférieure 51 qui comporte une saillie radiale intérieure 53a, à une extrémité d'une nervure 53, pour s'engager dans une fenêtre, non visible sur le dessin, du piston 4.A similar arrangement is provided for the
Le moteur hydraulique, plus généralement la machine hydraulique, selon l'invention peut être réalisé entièrement en matière plastique, y compris les moyens élastiques E formés par la lame 23, et présente une grande résistance aux produits chimiques sans aucune pièce métallique.The hydraulic motor, more generally the hydraulic machine, according to the invention can be made entirely of plastic, including the elastic means E formed by the
Le nombre de pièces constitutives de la machine est considérablement réduit. Le montage et la maintenance sont simplifiés et rendus plus aisés.The number of component parts of the machine is considerably reduced. Assembly and maintenance are simplified and made easier.
La bague d'étanchéité 50 de la grande section du piston intègre une lèvre de protection 59. Les bagues d'étanchéité démontables 50,51 permettent de conserver les sens d'étanchéité opposés pour obtenir l'injection du produit additif entrant par le manchon 13 dans la chambre de sortie 11.The sealing
Le mécanisme de commande du basculement de la biellette 14 et du changement de position du porte-clapets 15, 39 est particulièrement simple du type à trois points.The mechanism for controlling the tilting of the
Claims (11)
- A differential hydraulic machine, particularly a hydraulic motor, comprising:- a casing (1);- a differential piston (4) having a region (5) of large cross section and a region (6a) of smaller cross section capable of sliding in a reciprocating movement in the casing and in a smaller-diameter housing coaxial to the casing, respectively, the piston separating two chambers (8, 9) of the casing;- hydraulic switching means (C) for supplying liquid to and emptying the chambers separated by the piston, these switching means being controlled by the movements of the piston and being able to adopt two stable positions;- and triggering means capable, at the end of the travel of the piston, of causing a sudden change in the position of the switching means, under the action of an elastic means (E), in order to reverse the travel,
the piston (4) being equipped, in the region of its large cross section (5) and of its small cross section (6a), with sealing lips (48, 49) directed in opposite directions and facing toward one another,
characterized in that the sealing lips (48, 49) are provided on detachable circular rings (50, 51) and the piston (4) is molded as a single piece. - The hydraulic machine as claimed in claim 1, characterized in that each sealing ring (50, 51) is fixed to the piston by an assembly of the bayonet type.
- The hydraulic machine according to claim 2, characterized in that the assembly of the bayonet type comprises radial projections (52, 53) on the internal surface of the ring and corresponding peripheral slots (54, 55) on the external surface of the piston, with slots (56, 57) parallel to the geometric axis of the piston to allow each projection of the ring to align with a corresponding peripheral slot of the piston.
- The hydraulic machine as claimed in one of the preceding claims, characterized in that the sealing ring (50) provided in the region of the large cross section of the piston has a V-shaped profile the concave face of which faces toward the small cross section end and, on the opposite side, has a frustoconical sealing lip (59) the diameter of which increases in the direction toward the cover of the casing.
- The hydraulic machine as claimed in any one of the preceding claims, characterized in that the circular ring (51) for the small cross section of the piston has a V-shaped cross section the concave face of which faces toward the large cross section end.
- The hydraulic machine as claimed in claim 2 or 3, characterized in that the rings (50, 51) are designed to clip onto the piston (4) at the end of the turning of the bayonet assembly.
- The hydraulic machine as claimed in any one of the preceding claims, characterized in that the detachable circular rings (50, 51) are made of plastic.
- The differential piston for a hydraulic machine as claimed in any one of the preceding claims, having a region (5) of large cross section and a region (6a) of smaller cross section able to slide in a reciprocating movement in a casing and in a smaller-diameter housing coaxial with the casing, respectively, the piston separating two chambers (8, 9) of the casing, the piston (4) being equipped in the region of its large cross section (5) and of its small cross section (6a) with sealing lips (48, 49) directed in opposite directions and facing toward one another,
characterized in that the piston (4) is molded as a single piece and comprises means of assembly with detachable circular rings (50, 51) on which the sealing lips (48, 49) are provided. - The differential piston as claimed in claim 8, characterized in that the means of assembly with the detachable circular rings (50, 51) are of the bayonet type.
- The differential piston as claimed in claim 9, characterized in that the bayonet-type means of assembly comprise radial projections (52, 53) on the internal surface of the ring and corresponding peripheral slots (54, 55) on the external surface of the piston, with slots (56, 57) parallel to the geometric axis of the piston to allow each projection of the ring to align with a corresponding peripheral slot of the piston.
- The differential piston as claimed in claim 9 or 10, characterized in that it comprises at least one aperture (52b) for the clip-fastening of at least one ring (50) at the end of bayonet assembly.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0600313A FR2896280A1 (en) | 2006-01-13 | 2006-01-13 | HYDRAULIC MACHINE, IN PARTICULAR A HYDRAULIC ENGINE, WITH ALTERNATIVE MOTION, AND DIFFERENTIAL PISTON FOR SUCH A MACHINE. |
PCT/FR2006/002675 WO2007080251A1 (en) | 2006-01-13 | 2006-12-07 | Hydraulic machine, in particular hydraulic motor, with a reciprocating movement, and differential piston for such a machine |
Publications (2)
Publication Number | Publication Date |
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EP1971775A1 EP1971775A1 (en) | 2008-09-24 |
EP1971775B1 true EP1971775B1 (en) | 2010-09-08 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP06841882A Active EP1971775B1 (en) | 2006-01-13 | 2006-12-07 | Hydraulic machine, in particular hydraulic motor, with a reciprocating movement, and differential piston for such a machine |
Country Status (7)
Country | Link |
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US (1) | US8136441B2 (en) |
EP (1) | EP1971775B1 (en) |
AT (1) | ATE480711T1 (en) |
DE (1) | DE602006016868D1 (en) |
ES (1) | ES2352353T3 (en) |
FR (1) | FR2896280A1 (en) |
WO (1) | WO2007080251A1 (en) |
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FR3001003B1 (en) * | 2013-01-17 | 2015-03-20 | Dosatron International | ASSAY DEVICE FOR INTRODUCING A LIQUID ADDITIVE IN A MAIN LIQUID CURRENT. |
WO2016177739A1 (en) | 2015-05-05 | 2016-11-10 | Koninklijke Philips N.V. | Method and system for enhancing performance in a reciprocating compressor |
FR3042235B1 (en) * | 2015-10-13 | 2020-03-27 | Dosatron International | HYDRAULIC MACHINE AND REVERSIBLE DOSING PUMP EQUIPPED WITH SUCH A MACHINE |
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US217626A (en) * | 1879-07-15 | Improvement in automatic pumps | ||
US1362435A (en) * | 1919-05-29 | 1920-12-14 | Neraas Antone | Piston |
US1595939A (en) * | 1923-01-19 | 1926-08-10 | William S Hukill | Fluid-pressure prime mover |
FR2205361A1 (en) * | 1972-11-09 | 1974-05-31 | Cloup Philippe | Automatic injection of an additive into a liquid - using a differential piston assembly, the displacement of piston being controlled by liq. under pressure |
US5513963A (en) * | 1994-08-16 | 1996-05-07 | Frank And Robyn Walton 1990 Family Trust | Direct action fluid motor and injection pump |
FR2789445B1 (en) * | 1999-02-09 | 2001-03-23 | Dosatron Internat Sa | DIFFERENTIAL HYDRAULIC MACHINE WITH RECIPROCATING MOTION, IN PARTICULAR DIFFERENTIAL HYDRAULIC MOTOR |
DE20001503U1 (en) * | 2000-01-27 | 2001-04-26 | Stadur Produktions GmbH & Co. KG, 21714 Hammah | Device for connecting a pipeline to a hollow body |
DE20004675U1 (en) * | 2000-03-14 | 2000-06-29 | Max Widenmann Armaturenfabrik, 89537 Giengen | Fixed coupling for connecting a hose, especially a fire hose |
-
2006
- 2006-01-13 FR FR0600313A patent/FR2896280A1/en not_active Withdrawn
- 2006-12-07 WO PCT/FR2006/002675 patent/WO2007080251A1/en active Application Filing
- 2006-12-07 AT AT06841882T patent/ATE480711T1/en not_active IP Right Cessation
- 2006-12-07 ES ES06841882T patent/ES2352353T3/en active Active
- 2006-12-07 US US12/160,431 patent/US8136441B2/en active Active
- 2006-12-07 EP EP06841882A patent/EP1971775B1/en active Active
- 2006-12-07 DE DE602006016868T patent/DE602006016868D1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2007080251A1 (en) | 2007-07-19 |
DE602006016868D1 (en) | 2010-10-21 |
ES2352353T3 (en) | 2011-02-17 |
US8136441B2 (en) | 2012-03-20 |
EP1971775A1 (en) | 2008-09-24 |
ATE480711T1 (en) | 2010-09-15 |
FR2896280A1 (en) | 2007-07-20 |
US20100269685A1 (en) | 2010-10-28 |
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