US20090084258A1 - Hydrostatic piston machine comprising a rotatable cam disk - Google Patents
Hydrostatic piston machine comprising a rotatable cam disk Download PDFInfo
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- US20090084258A1 US20090084258A1 US12/280,968 US28096807A US2009084258A1 US 20090084258 A1 US20090084258 A1 US 20090084258A1 US 28096807 A US28096807 A US 28096807A US 2009084258 A1 US2009084258 A1 US 2009084258A1
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- control
- piston machine
- control plate
- slots
- control slots
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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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/22—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
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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
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0602—Component parts, details
- F03C1/0605—Adaptations of pistons
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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
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0602—Component parts, details
- F03C1/0607—Driven means
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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
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F03C1/0644—Component parts
- F03C1/0652—Cylinders
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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
- F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
- F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
- F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F03C1/0644—Component parts
- F03C1/0663—Casings, housings
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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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
- F04B1/124—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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/128—Driving means
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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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/16—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders having two or more sets of cylinders or 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2035—Cylinder barrels
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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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2064—Housings
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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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2078—Swash plates
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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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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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
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
- F04B23/08—Combinations of two or more pumps the pumps being of different types
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/11—Kind or type liquid, i.e. incompressible
Definitions
- the invention relates to a hydrostatic piston machine which is provided for delivery in two hydraulic circuits.
- a hydrostatic piston machine which is connected to two separate hydraulic circuits.
- a pump of such a configuration it is particularly advantageous to be able to alter separately the volumetric displacement for the two different hydraulic circuits.
- Such an axial piston machine is known from DE 103 58 728 A1.
- the axial piston machine comprises a cylinder drum arranged rotatably in a housing.
- a first group of cylinder bores, as well as a second group of cylinder bores, are arranged in the cylinder drum.
- Respectively arranged in the cylinder bores are longitudinally displaceable pistons which are supported on a swash plate for producing a piston stroke.
- the swash plate may be inclined about a first swivelling axis and about a second swivelling axis, so that the volumetric displacement may be adjusted for the first and second hydraulic circuit.
- the first and the second swivelling axis are preferably perpendicular to one another. Accordingly, control slots are arranged in a control plate which allows the two-part connection of the cylinder bores to the connections of the first and/or the second hydraulic circuit.
- the two control slots for the first group of cylinder bores and the two control slots for the second group of cylinder bores are, therefore, rotated by 90° relative to one another, so that one respective inclination about the first swivelling axis produces an alteration to the volumetric displacement in the first hydraulic circuit and an inclination of the swash plate about the second swivelling axis produces an alteration to the volumetric displacement in the second hydraulic circuit.
- the object of the invention is, therefore, to provide a hydrostatic piston machine which is improved with regard to its efficiency with simultaneous delivery in the first and the second circuits.
- the hydrostatic piston machine comprises a housing in which a cylinder drum is rotatably arranged.
- a first group of cylinder bores and a second group of cylinder bores are arranged in the cylinder drum.
- the first group of cylinder bores communicates, via first control slots which are arranged in a control plate and when the cylinder drum is rotated, temporarily with the connections of a first hydrostatic circuit.
- the first group of cylinder bores is thus connected to a connection on the suction side and/or a connection on the pressure side of the first hydraulic circuit via the first control slot when the cylinder drum is rotated.
- a second group of cylinder bores which are also arranged in the cylinder drum are temporarily connected via second control slots of the control plate to a second circuit on the delivery side and/or suction side.
- pistons are longitudinally displaceably arranged in the cylinder bores of the first group as well as in the cylinder bores of the second group.
- the pistons are supported on a swash plate for generating a piston stroke when the cylinder drum is rotated.
- the swash plate may be inclined about at least one swivelling axis.
- the position of the control slots may be altered relative to the at least one swivelling axis.
- the control slots may be respectively oriented such that the dead centre regions arranged between the control slots are arranged in the control plate in the region of the top and/or the bottom dead centre of the pistons.
- a pure suction stroke, and/or a pure compression stroke is carried out by the pistons without the pistons exceeding the top and bottom dead centre.
- the reversal from a suction stroke to a compression stroke in the region of the top and/or the bottom dead centre is thus carried out in a dead centre region of the control plate located between the first control slots and/or between the second control slots.
- Such a design may, for example, be advantageous if a motor and/or a cylinder are supplied with pressure medium by the two hydraulic circuits.
- a further example thereof is the combination of a drive in the first hydraulic circuit with a working hydraulic system in the second hydraulic circuit.
- the control plate For adapting the relative position of the first control slots and/or the second control slots to the at least one swivelling axis of the swash plate it is advantageous to design the control plate with a first control plate ring and with a second control plate ring.
- the two control plate rings have different diameters so that, preferably, the second control plate ring is arranged in the first control plate ring and centres said first control plate ring.
- the first control plate ring thus encompasses the first control slots and the second control plate ring encompasses the second control slots.
- a preferred embodiment results when the first control plate ring is configured as a spur gear and/or the second control plate ring is configured as an internal gear wheel, and at least one of the two control plate rings cooperates with a toothing of an adjusting element. In this manner, the adjustment of the relative position may take place either via the first control plate ring or, however, via the second control plate ring. If the first control plate ring is configured as a spur gear and the second control plate ring is configured as an internal gear wheel, an independent adjustment may be additionally carried out, therefore, by one respective adjusting element.
- the first control plate ring is designed as an internal gear wheel of a planetary gear set and the second control plate ring as a sun wheel of the planetary gear set. In this manner, it is sufficient either to displace the first control plate ring or the second control plate ring by an adjusting element. Planet wheels fixed on the housing side transfer the adjusting movement to the respective other control plate ring by reversing the rotational direction.
- FIG. 1 shows a sectional view of an axial piston machine for delivery in two separate hydraulic circuits
- FIG. 2 shows an enlarged view of the drive mechanism of the axial piston machine according to FIG. 1 ;
- FIG. 3 shows a diagrammatic view comprising a swash plate inclined about a first swivelling axis
- FIG. 4 shows a diagrammatic view comprising a swash plate inclined about a second swivelling axis
- FIG. 5 shows a diagrammatic view of an adjustable control plate for a hydrostatic piston machine
- FIG. 6 shows a diagrammatic view of the rear face of the adjustable control plate shown in FIG. 1 ;
- FIG. 7 shows a second embodiment for an adjustable control plate
- FIG. 8 shows a third embodiment for an adjustable control plate.
- a common drive shaft 2 is mounted by a roller bearing 3 on one end of a housing 4 . Additionally, the common drive shaft 2 is mounted in a plain bearing 6 which is arranged in a connecting plate 5 , which closes the housing 4 at the opposing end.
- An opening 7 is configured in the connecting plate 5 penetrating the connecting plate 5 completely in the axial direction, in which firstly the plain bearing 6 is arranged and which secondly is penetrated by the common drive shaft 2 .
- an auxiliary pump 8 is inserted in a radial widening of the opening 7 .
- the common drive shaft 2 has a toothing 9 which is in engagement with a corresponding toothing of an auxiliary pump shaft 10 .
- the auxiliary pump shaft 10 is mounted in the opening 7 by a first auxiliary pump plain bearing 11 and by a second auxiliary pump plain bearing 12 in an auxiliary pump connecting plate 13 .
- auxiliary pump gear wheel 14 is arranged on the auxiliary pump shaft 10 which is in engagement with an auxiliary pump internal gear wheel 15 .
- the auxiliary pump internal gear wheel 15 which is rotatably arranged in the auxiliary pump connecting plate 13 , is also driven by the auxiliary pump shaft 10 and thus ultimately by the common drive shaft 2 .
- Configured in the auxiliary pump connecting plate 13 are the connections on the suction side and on the pressure side for the auxiliary pump 8 .
- the auxiliary pump 8 is fixed in the radial widening of the opening 7 of the connecting plate 5 by a cover 16 , which is mounted on the connecting plate 5 .
- the inner race of the roller bearing 3 is fixed in the axial direction on the common drive shaft 2 .
- the inner race bears, on the one hand, against a collar 17 of the common drive shaft 2 and is retained, on the other hand, in this axial position by a locking ring 18 which is inserted into a groove of the common drive shaft 2 .
- the axial position of the roller bearing 3 relative to the housing 4 is determined by a further locking ring 19 , which is inserted into a peripheral groove of the shaft opening 20 .
- the roller bearing 3 bears against a housing shoulder, not shown, of the housing 4 .
- a sealing ring 21 and finally a further locking ring 22 are arranged, the locking ring 22 being inserted into a peripheral groove of the shaft opening 20 .
- a drive toothing 23 is configured, via which the hydrostatic piston machine is driven by a drive machine, not shown.
- a cylinder drum 24 Arranged in the interior of the housing 4 is a cylinder drum 24 which has a central through-opening 25 , which is penetrated by the common drive shaft 2 .
- the cylinder drum 24 is connected to the common drive shaft 2 by means of a driving spline 26 so as to be locked against rotation but displaceable in the axial direction, so that a rotational movement of the common drive shaft 2 is transmitted to the cylinder drum 24 .
- a further locking ring 27 Inserted into a peripheral groove formed in the central through-opening 25 is a further locking ring 27 against which a first support disk 28 bears.
- the first support disk 28 forms a first spring bearing for a compression spring 29 .
- a second spring bearing for the compression spring 29 is formed by a second support disk 30 , which is supported on the front face of the driving spline 26 .
- the compression spring 29 thus exerts, on the one hand, on the common drive shaft 2 and, on the other hand, on the cylinder drum 24 a force in the respectively opposed axial direction.
- the common drive shaft 2 is loaded such that the outer race of the roller bearing 3 is supported on the locking ring 19 .
- the compression spring 29 acts in the opposite direction on the cylinder drum 24 which is retained by a spherical recess 31 configured on the front face of the cylinder drum 24 in abutment against a control plate 32 .
- the control plate 32 bears, in turn, with the face remote from the cylinder drum 24 sealingly against the connecting plate 5 .
- the cylinder drum 24 is centred by means of the spherical recess 31 , which corresponds to a matching spherical projection of the control plate 32 .
- the control plate 32 may also be designed as a planar disk if, for example, a centring of the cylinder drum 24 carried out in a different manner with a spherical control plate 32 might lead to redundancy.
- Cylinder bores 33 are introduced into the cylinder drum 24 , distributed over a common pitch circle, in which pistons 34 are arranged which are longitudinally displaceable in the cylinder bores 33 .
- the pistons 34 project partially out of the cylinder drum 24 .
- fastened to the pistons 34 is one respective sliding shoe 35 , via which the pistons 34 are supported on a bearing surface 36 of a swash plate 37 .
- the angle which the bearing surface 36 of the swash plate 37 encloses with a central axis 40 is variable.
- the inclination of the swash plate 37 may be adjusted by an adjusting device 38 .
- the swash plate 37 is supported in the housing 4 for absorbing the forces which are transmitted by the sliding shoes 35 to the swash plate 37 .
- a first connection 39 and a second connection 39 ′ are shown diagrammatically in the connecting plate 5 which, in a manner not shown, may be connected via the control plate 32 to the cylinder bores 33 .
- FIG. 2 An enlarged view of the components cooperating in the interior of the housing 4 is shown in FIG. 2 .
- the swash plate 37 is coupled to a slide block 44 which, in a manner not shown, rotates the swash plate 37 about a swivelling axis located in the drawing plane.
- the cylinder bores are divided into a first group of cylinder bores 33 . 1 and a second group of cylinder bores 33 . 2 .
- one respective sliding shoe 35 is arranged against the end of the pistons 34 remote from the control plate 32 .
- the sliding shoe 35 is fastened by a recess to a spherical head of the piston 34 , so that the sliding shoe 35 is movably fixed to the piston 34 and tensile and compressive forces may be transmitted.
- a sliding surface 45 Configured on the sliding shoe 35 is a sliding surface 45 by means of which the sliding shoe 35 and thus the piston 34 are supported on the bearing surface 36 of the swash plate 37 .
- Formed in the sliding surface 45 are lubricating oil grooves which are connected via a lubricating oil channel 46 , which is configured in the sliding shoe 35 and extended in the piston 34 as a lubricating oil bore 46 ′, to the cylinder bores 33 configured in the cylinder drum 24 .
- the pistons 34 execute a lifting movement between a top dead centre and a bottom dead centre, by means of which the pressure medium located in the cylinder chambers in the cylinder drum 24 is placed under pressure.
- the sliding shoes 35 are hydrostatically relieved on the bearing surface 36 of the swash plate 37 .
- first connecting channels 47 . 1 and/or second connecting channels 47 . 2 are connected to the cylinder bores of the first group 33 . 1 and/or the cylinder bores of the second group 33 . 2 .
- the first and second connecting channels 47 . 1 and 47 . 2 extend from the cylinder bores of the first group 33 . 1 and/or the cylinder bores of the second group 33 . 2 to the spherical recess 31 , which is configured on a front face 48 of the cylinder drum 24 .
- first control slots 50 and 51 which penetrate the control plate 32 in the axial direction.
- second control slots are configured in the control plate 32 , which as a result of the position of the cutting plane are not visible in FIG. 2 .
- first control slots 50 and 51 are connected via the connecting plate 5 to working lines of the first hydraulic circuit, in a corresponding manner the second control slots are connected to the two working lines of the second hydraulic circuit.
- the first control slots 50 and 51 are at an identical first distance R 1 from the central axis 40 of the cylinder drum 24 , which is greater than the distance R 2 which, in turn, is identical for the second control slots.
- the first connecting channels 47 . 1 are connected in succession to the first kidney-shaped control ports 50 and the second kidney-shaped control ports 51 , so that as a result of the lifting movement of the pistons 34 arranged in the cylinder bores 33 . 1 of the first group, the pressure medium is drawn in via the one first control slot 51 and pumped via the other first control slot 50 into the working line of the first hydraulic circuit on the pressure side.
- the first connecting channels 47 . 1 are arranged in the cylinder drum 24 , such that the first distance R 1 of the outlet on the front face 48 is greater than the second distance R 2 at which the second connecting channels 47 . 2 open out on the front face 48 .
- the second connecting channels 47 . 2 have a radial directional component and accordingly open out on the front face 48 of the cylinder drum 24 at the second distance R 2 , which corresponds to the distance of the second control slot from the central axis 40 .
- the cylinder bores of the second group 33 . 2 are alternately connected via the second connecting channels 47 . 2 to the two second control slots.
- a retraction plate 52 is provided which encompasses the sliding shoes 35 on a shoulder provided therefor.
- the retraction plate 52 comprises, for example, a spherical central recess 53 with which it is supported against a retraction ball 54 , which is arranged on the end of the cylinder drum 24 remote from the front face 48 .
- FIG. 3 it is shown how, proceeding from an axial piston machine of FIGS. 1 and 2 , with a swash plate 37 ′ an independent adjustment of the delivery rates may be achieved for the two hydraulic circuits.
- the swash plate 37 ′ may be inclined about a first swivelling axis 55 and about a second swivelling axis 56 .
- the first and the second swivelling axes 55 and 56 are located in the plane of the bearing surface 36 of the swash plate 37 and, when the axial piston machine is set to zero volumetric displacement in both hydraulic circuits, enclose an angle of 90° with the central axis 40 .
- the second connecting ducts 47 . 2 move during a half revolution of the cylinder drum 24 from the bottom dead centre to the top dead centre, substantially along the one second control slot 57 so that the pressure medium is forced into the working line of the second hydraulic circuit on the pressure side.
- the second connecting ducts 47 . 2 move en route from the top dead centre to the bottom dead centre substantially along the other second control slot 58 and perform a suction stroke.
- first swivelling axis 55 and the second swivelling axis 56 are arranged at right angles to one another.
- a delivery into the first hydraulic circuit does not occur with the illustrated deflection of the swash plate 37 ′.
- the position of the first control slots 50 and 51 is symmetrical relative to the position of the top and/or bottom dead centre, so that in spite of the use of the common swash plate 37 ′ in the first hydraulic circuit only one pulsation is produced as long as the swash plate 37 ′ is not additionally inclined about the first swivelling axis 55 .
- the first and the second control slots 50 , 51 , 57 , 58 are preferably arranged in the control plate 32 rotated by 90° relative to one another.
- the second control slots 57 , 58 are thus configured to be symmetrical to a projection 56 ′ of the second swivelling axis 56 into the plane of the control plate 32 .
- the first control slots 50 , 51 are accordingly symmetrically configured relative to a projection (not shown) of the first swivelling axis 55 . This is, however, a drawback for a variable adjustment of the delivery rates of both circuits.
- first swivelling axis 55 and the second swivelling axis 56 are arranged at right angles to one another, the two swivelling axes 55 and 56 being located in the plane of the bearing surface 36 .
- the point of intersection of the first swivelling axis 55 with the second swivelling axis 56 coincides with the point of intersection of both swivelling axes 55 and 56 with the central axis 40 .
- the swash plate 37 ′ On its face remote from the bearing surface 36 , the swash plate 37 ′ is configured to be of hemispherical shape, at least in a region 59 adjoining the bearing surface 36 .
- a ball bearing or a plain bearing may be provided in order to support the swash plate 37 ′ and to permit the rotation thereof.
- the hemispherical region 59 is defined by a flattened portion 63 preferably configured parallel to the bearing surface 36 .
- the adjustment of the inclination of the swash plate 37 ′ may be carried out either via a separate adjusting device for each swivelling axis 55 and 56 , in FIG. 1 only the adjusting device for the swivelling axis 55 being shown and the adjusting device for the swivelling axis 56 not being visible in the sectional view, or however via a common adjusting device via which a resulting angle of inclination of the swash plate 37 ′ is set.
- FIG. 4 it is shown that the swash plate 37 ′ is located in its neutral position relative to the second swivelling axis 56 , but is inclined relative to its first swivelling axis 55 .
- an effective stroke is produced only for the pistons 34 which are alternately connected via the first connecting channels 47 . 1 during a revolution of the cylinder drum 24 to the one first control slot 50 and the other first control slot 51 .
- FIG. 5 An embodiment for an adjustable control plate 32 ′ is shown in FIG. 5 .
- the control plate 32 ′ comprises a first control plate ring 70 and a second control plate ring 71 .
- the first control plate ring 70 and the second control plate ring 71 are arranged in a common plane and together form the control plate 32 ′.
- the external diameter of the second control plate ring 71 is dimensioned such that the second control plate ring 71 may be arranged in a central recess of the first control plate ring 70 .
- first control plate ring 70 and the second control plate ring 71 form a internal gear wheel and/or a sun wheel of a planetary gear set.
- a first toothing 72 is configured on the outer front face.
- a second toothing 73 is configured relative to the internal peripheral edge of the first control plate ring 70 which is set back in the radial direction, over a portion of the depth of the first control plate ring 70 . Accordingly, relative to the outer peripheral edge of the second control plate ring 71 which is set back in the radial direction, a third toothing 74 is formed on the second control plate ring 71 .
- planetary gears 75 . 1 , 75 . 2 and 75 . 3 Arranged between the second toothing 73 of the first control plate ring 70 and the third toothing 74 of the second control plate ring 71 are planetary gears 75 . 1 , 75 . 2 and 75 . 3 .
- the planetary gears 75 . 1 , 75 . 2 and 75 . 3 are rotatable about their central axes but fixedly arranged in the housing 4 of the piston machine 1 .
- the two first control slots 50 and 51 are formed on their face facing the connecting plate 5 by four respective control slot portions 50 . 1 to 50 . 4 and/or 51 . 1 to 51 . 4 . Accordingly, the second control slots 57 and/or 58 are formed by control slot portions 57 . 1 to 57 . 4 and/or 58 . 1 to 58 . 4 .
- First dead centre regions 86 and/or 87 are formed between the control slot portions 50 . 1 to 50 . 4 and the control slot portions 51 . 1 to 51 . 4 .
- second dead centre regions 88 and/or 89 are formed between the second control slot portions 57 . 1 to 57 . 4 and 58 . 1 to 58 . 4 .
- the position of said first dead centre regions 86 , 87 and/or second dead centre regions 88 and/or 89 are adapted to the top and bottom dead centre positions resulting from the inclination of the swash plate 37 .
- the adaptation of the dead centre regions 86 , 87 and 88 , 89 takes place in opposing directions.
- the rotational direction of the first control plate ring 70 is, to this end, transmitted in the planetary gear set in which the planetary gears 75 . 1 to 75 . 3 are fixedly arranged, in the reverse direction onto the second control plate ring 71 .
- An adjusting element 76 is provided for producing the drive torque on the first control plate ring 70 .
- the adjustment both of the first adjusting control plate ring 70 and of the second control plate ring 71 is therefore produced by a single adjusting element 76 .
- the adjusting element 76 comprises a shaft 77 which carries, on a first end, a first spur gear 78 and, on its second end, a second spur gear 79 .
- the two spur gears 78 and 79 are connected to the shaft 77 fixedly in terms of rotation which, in a manner not shown, is mounted in the connecting plate 5 of the hydrostatic piston machine 1 .
- a rotational movement of the shaft 77 is transmitted to the first control plate ring 70 via the first spur gear 78 which is in engagement with the first toothing 72 of the first control plate ring 70 .
- the rotational movement of the shaft 77 is produced on the second spur gear 79 , the toothing on the front face of the second spur gear 79 cooperating with a gear rack 80 .
- the gear rack 80 is preferably axially displaceably arranged in the connecting plate 5 and may be acted upon at its two front faces 81 , 82 , for example by a hydraulic force.
- the gear rack 80 is preferably mounted sealingly in the connecting plate 5 in the region of its opposing ends through a first guide region 83 and a second guide region 84 .
- Configured on the two front faces 81 and 82 , in the connecting plate 5 are pressure chambers, through which the first front face 81 and/or the second front face 82 may be acted upon by a hydraulic force.
- the gear rack 80 is displaced and produces a rotational movement of the adjusting element 76 which, with the second spur gear 79 , is in engagement with a gear rack toothing 85 .
- a displacement of the relative position of the first control plate ring 70 and thus of the first control slots 50 , 51 relative to the swivelling axis of the swash plate 37 is possible.
- the formation of the control plate 32 ′ as a planetary gear set an opposing alteration to the relative position of the second control plate ring 71 is effected.
- FIG. 5 The arrangement of FIG. 5 is shown in FIG. 6 from the rear.
- the face of the control plate 32 ′ oriented toward the cylinder drum 24 is shown in FIG. 6 .
- the first control slot portions 50 . 1 to 50 . 4 and 51 . 1 to 51 . 4 on this face are connected to first control slots 50 and/or 51 .
- the second control slot portions 57 . 1 to 57 . 4 and/or 58 . 1 to 58 . 4 are connected to second control slots 57 to 58 .
- the first dead centre regions 86 ′, 871 may be seen clearly and between the second control slots 57 , 58 the second dead centre regions 88 ′, 89 ′ may be seen clearly.
- the internal diameter d 1 of the first control plate ring 70 corresponds to the external diameter D 2 of the second control plate ring 71 , so that the first control plate ring 70 is centred on the second control plate ring 71 .
- FIG. 7 A second embodiment for an adjustable control plate is shown in FIG. 7 .
- the first toothing 72 of the first control plate ring 70 cooperates with a first adjusting element 76 ′.
- the first adjusting element 76 is driven by the drive element 80 in the same manner as has already been explained with reference to FIG. 5 .
- the dependent adjustment of the first control plate ring 70 ′ and the second control plate ring 71 ′ takes place, however, not by forming the first control plate ring 70 ′ as an internal gear wheel and the second control plate ring 71 ′ as a sun wheel of a planetary gear set, but by a second adjusting element 90 which directly drives the second control plate ring 71 ′.
- the second control plate ring 71 ′ is, to this end, provided on its inner periphery with a fourth toothing 91 which cooperates with a first spur gear 92 of the second adjusting element 90 .
- the second adjusting element 90 is also constructed with a shaft 93 , the first spur gear 92 as well as a second spur gear 94 of the second adjusting element 90 being arranged on the opposing ends thereof.
- the two adjusting elements 76 and 90 are preferably of identical construction.
- the second spur gears 79 and 94 of the first adjusting element 76 and/or of the second adjusting element 90 are connected to one another via a spur gear unit.
- the spur gear comprises a single intermediate gear 95 .
- the intermediate gear 95 is also arranged in the connecting plate 5 , in a manner not shown.
- the second adjusting element 90 is adapted to the first adjusting element 76 insofar as the resulting rotational movement of the first control plate ring 70 and of the second control plate ring 71 is identical.
- a single adjusting element 76 and/or 90 is in turn associated with each control plate ring 70 ′, 71 ′.
- one separate gear rack 80 is provided as a drive element and/or 96 .
- the second drive element 96 cooperates via a spur gear unit with the further spur gear 95 ′.
- adjustable control plates 32 ′ it is possible to adapt the position of the first and/or second dead centre regions 86 , 87 , 88 , 89 to the respective operating state of the piston machine 1 .
- the resulting swivelling axis which results from the inclination of the swashplate 37 about the first swivelling axis 55 and the second swivelling axis 56 , is variable. Accordingly, the position of the top and/or bottom dead centre of the pistons 34 is altered in the cylinder bores 33 . 1 , 33 . 2 of the first as well as the second group.
- the invention is not restricted to the embodiments shown. In particular it is possible to combine individual features of the individual embodiments in any manner with one another.
Abstract
The invention relates to a hydrostatic piston machine. The hydrostatic piston machine comprises a housing in which a cylinder drum is rotatably arranged. A first group of cylinder bores and a second group of cylinder bores are arranged in the cylinder drum. Arranged longitudinally displaceably in the cylinder bores are respective pistons, which are supported on a swash plate which may be inclined about at least one swivelling axis. The first group of cylinder bores is temporarily connected to a first hydraulic circuit via first control slots (50, 51) of a control plate, when the cylinder drum is rotated. Accordingly, the cylinder bores of the second group are temporarily connected to a second hydraulic circuit via second control slots (57, 58) of the control plate (32′), when the cylinder drum is rotated. The relative position of the first and/or second control slots (50, 51; 57, 58) may be altered relative to the at least one swivelling axis of the swash plate.
Description
- The invention relates to a hydrostatic piston machine which is provided for delivery in two hydraulic circuits.
- For different applications it may be advantageous to provide a hydrostatic piston machine which is connected to two separate hydraulic circuits. In this connection, in a pump of such a configuration it is particularly advantageous to be able to alter separately the volumetric displacement for the two different hydraulic circuits. Such an axial piston machine is known from DE 103 58 728 A1. The axial piston machine comprises a cylinder drum arranged rotatably in a housing. A first group of cylinder bores, as well as a second group of cylinder bores, are arranged in the cylinder drum. Respectively arranged in the cylinder bores are longitudinally displaceable pistons which are supported on a swash plate for producing a piston stroke.
- The swash plate may be inclined about a first swivelling axis and about a second swivelling axis, so that the volumetric displacement may be adjusted for the first and second hydraulic circuit. The first and the second swivelling axis are preferably perpendicular to one another. Accordingly, control slots are arranged in a control plate which allows the two-part connection of the cylinder bores to the connections of the first and/or the second hydraulic circuit. The two control slots for the first group of cylinder bores and the two control slots for the second group of cylinder bores are, therefore, rotated by 90° relative to one another, so that one respective inclination about the first swivelling axis produces an alteration to the volumetric displacement in the first hydraulic circuit and an inclination of the swash plate about the second swivelling axis produces an alteration to the volumetric displacement in the second hydraulic circuit.
- In the axial piston machine known from DE 103 58 728 A1 it is a drawback that the arrangement of the first control slots and the second control slots relative to one another is predetermined in a fixed manner. In particular, the position thereof is also fixedly set relative to the swivelling axes. In the event that a delivery flow is to be produced not just in the first or in the second hydraulic circuit by the pump, the pistons exceed their top and/or bottom dead centre, whilst the corresponding cylinder bore communicates with one of the control slots. This leads to an undesirable reduction of the efficiency. In order to avoid this, in particular for the simultaneous adjustment of the volumetric displacement in the first and in the second circuit, an adaptation of the position of the first control slots and the second control slots relative to one another as well as to the position of the resulting inclination of the swash plate might be required.
- The object of the invention is, therefore, to provide a hydrostatic piston machine which is improved with regard to its efficiency with simultaneous delivery in the first and the second circuits.
- The object is achieved by the hydrostatic piston machine according to the invention with the features of claim 1. The sub-claims contain advantageous developments of the invention.
- The hydrostatic piston machine according to the invention comprises a housing in which a cylinder drum is rotatably arranged. A first group of cylinder bores and a second group of cylinder bores are arranged in the cylinder drum. The first group of cylinder bores communicates, via first control slots which are arranged in a control plate and when the cylinder drum is rotated, temporarily with the connections of a first hydrostatic circuit. The first group of cylinder bores is thus connected to a connection on the suction side and/or a connection on the pressure side of the first hydraulic circuit via the first control slot when the cylinder drum is rotated. In a corresponding manner, a second group of cylinder bores which are also arranged in the cylinder drum are temporarily connected via second control slots of the control plate to a second circuit on the delivery side and/or suction side. For generating a volumetric flow, pistons are longitudinally displaceably arranged in the cylinder bores of the first group as well as in the cylinder bores of the second group. The pistons are supported on a swash plate for generating a piston stroke when the cylinder drum is rotated. The swash plate may be inclined about at least one swivelling axis. According to the invention, for adapting the position of the control slots to the position of the top and bottom dead centre predetermined by the adjustment of the swash plate, the position of the control slots may be altered relative to the at least one swivelling axis.
- By adapting the position of the control slots relative to the at least one swivelling axis, the control slots may be respectively oriented such that the dead centre regions arranged between the control slots are arranged in the control plate in the region of the top and/or the bottom dead centre of the pistons. As a result, it is achieved that while the cylinder bores of the first and/or the second group are connected to the respective control slots, a pure suction stroke, and/or a pure compression stroke is carried out by the pistons without the pistons exceeding the top and bottom dead centre. The reversal from a suction stroke to a compression stroke in the region of the top and/or the bottom dead centre is thus carried out in a dead centre region of the control plate located between the first control slots and/or between the second control slots.
- Advantageous developments of the hydrostatic piston machine according to the invention are explained in the sub-claims.
- It is advantageous, in particular, to carry out the alteration of the relative position of the first control slots and the alteration of the position of the second control slots differently. In this connection, moreover, it is advantageous, in particular, to carry out the alteration of the relative position of the first control slots and the alteration of the position of the second control slots in a manner which is interdependent, for example, the angle of rotation of the alteration of the position of the first control slots differing from an angle of rotation of the alteration of the position of the second control slots, but being in a fixed relationship thereto.
- According to the application, it may be advantageous in particular to alter the position of the first control slots and the position of the second control slots in the same direction. This means that the rotational direction in which the alteration is carried out of the relative position to the at least one swivelling axis of the swash plate is the same for the first control slots and for the second control slots. In a further application, it may however be advantageous that the interdependent alteration of the position of the first control slots and the second control slots is carried out in opposing directions.
- It may also be advantageous to be able to alter the position of the first control slots and the position of the second control slots independently of one another. Such a design may, for example, be advantageous if a motor and/or a cylinder are supplied with pressure medium by the two hydraulic circuits. A further example thereof is the combination of a drive in the first hydraulic circuit with a working hydraulic system in the second hydraulic circuit.
- For adapting the relative position of the first control slots and/or the second control slots to the at least one swivelling axis of the swash plate it is advantageous to design the control plate with a first control plate ring and with a second control plate ring. The two control plate rings have different diameters so that, preferably, the second control plate ring is arranged in the first control plate ring and centres said first control plate ring. The first control plate ring thus encompasses the first control slots and the second control plate ring encompasses the second control slots.
- A preferred embodiment results when the first control plate ring is configured as a spur gear and/or the second control plate ring is configured as an internal gear wheel, and at least one of the two control plate rings cooperates with a toothing of an adjusting element. In this manner, the adjustment of the relative position may take place either via the first control plate ring or, however, via the second control plate ring. If the first control plate ring is configured as a spur gear and the second control plate ring is configured as an internal gear wheel, an independent adjustment may be additionally carried out, therefore, by one respective adjusting element.
- In the event that an opposing adjustment of the first control slots and the second control slots has to be carried out, preferably the first control plate ring is designed as an internal gear wheel of a planetary gear set and the second control plate ring as a sun wheel of the planetary gear set. In this manner, it is sufficient either to displace the first control plate ring or the second control plate ring by an adjusting element. Planet wheels fixed on the housing side transfer the adjusting movement to the respective other control plate ring by reversing the rotational direction.
- Preferred embodiments of the hydrostatic piston machine according to the invention are shown in the drawings and are explained in more detail in the following description. In this connection, with reference to
FIGS. 1 to 4 , generally the mode of operation of a hydrostatic piston machine is firstly explained according to the prior art, which is provided for delivering pressure medium in two separate circuits, in which: -
FIG. 1 shows a sectional view of an axial piston machine for delivery in two separate hydraulic circuits; -
FIG. 2 shows an enlarged view of the drive mechanism of the axial piston machine according toFIG. 1 ; -
FIG. 3 shows a diagrammatic view comprising a swash plate inclined about a first swivelling axis; -
FIG. 4 shows a diagrammatic view comprising a swash plate inclined about a second swivelling axis; -
FIG. 5 shows a diagrammatic view of an adjustable control plate for a hydrostatic piston machine; -
FIG. 6 shows a diagrammatic view of the rear face of the adjustable control plate shown inFIG. 1 ; -
FIG. 7 shows a second embodiment for an adjustable control plate and -
FIG. 8 shows a third embodiment for an adjustable control plate. - Before an actual conversion for producing the alteration of the relative position of control slots in a control plate relative to a swivelling axis of a hydrostatic piston machine is explained, the construction and the function of a hydrostatic piston machine, which is provided for delivering pressure medium in two independent hydraulic circuits, are to be explained first for better understanding.
- In the longitudinal section of a hydrostatic piston machine 1 shown in
FIG. 1 it is shown how a common drive shaft 2 is mounted by a roller bearing 3 on one end of a housing 4. Additionally, the common drive shaft 2 is mounted in a plain bearing 6 which is arranged in a connecting plate 5, which closes the housing 4 at the opposing end. - An opening 7 is configured in the connecting plate 5 penetrating the connecting plate 5 completely in the axial direction, in which firstly the plain bearing 6 is arranged and which secondly is penetrated by the common drive shaft 2. On the side of the connecting plate 5 remote from the housing 4, an auxiliary pump 8 is inserted in a radial widening of the opening 7. For driving the auxiliary pump 8, the common drive shaft 2 has a
toothing 9 which is in engagement with a corresponding toothing of anauxiliary pump shaft 10. Theauxiliary pump shaft 10 is mounted in the opening 7 by a first auxiliary pump plain bearing 11 and by a second auxiliary pumpplain bearing 12 in an auxiliarypump connecting plate 13. - An auxiliary pump gear wheel 14 is arranged on the
auxiliary pump shaft 10 which is in engagement with an auxiliary pumpinternal gear wheel 15. Via the auxiliary pump gear wheel 14, the auxiliary pumpinternal gear wheel 15 which is rotatably arranged in the auxiliarypump connecting plate 13, is also driven by theauxiliary pump shaft 10 and thus ultimately by the common drive shaft 2. Configured in the auxiliarypump connecting plate 13 are the connections on the suction side and on the pressure side for the auxiliary pump 8. The auxiliary pump 8 is fixed in the radial widening of the opening 7 of the connecting plate 5 by acover 16, which is mounted on the connecting plate 5. - The inner race of the roller bearing 3 is fixed in the axial direction on the common drive shaft 2. The inner race bears, on the one hand, against a
collar 17 of the common drive shaft 2 and is retained, on the other hand, in this axial position by a lockingring 18 which is inserted into a groove of the common drive shaft 2. The axial position of the roller bearing 3 relative to the housing 4 is determined by afurther locking ring 19, which is inserted into a peripheral groove of theshaft opening 20. On the other side the roller bearing 3 bears against a housing shoulder, not shown, of the housing 4. In the direction of the outside of the housing 4 in theshaft opening 20, moreover, a sealingring 21 and finally a further lockingring 22 are arranged, the lockingring 22 being inserted into a peripheral groove of theshaft opening 20. - On the end of the common drive shaft 2 projecting from the housing 4, a
drive toothing 23 is configured, via which the hydrostatic piston machine is driven by a drive machine, not shown. - Arranged in the interior of the housing 4 is a
cylinder drum 24 which has a central through-opening 25, which is penetrated by the common drive shaft 2. Thecylinder drum 24 is connected to the common drive shaft 2 by means of adriving spline 26 so as to be locked against rotation but displaceable in the axial direction, so that a rotational movement of the common drive shaft 2 is transmitted to thecylinder drum 24. - Inserted into a peripheral groove formed in the central through-opening 25 is a
further locking ring 27 against which afirst support disk 28 bears. Thefirst support disk 28 forms a first spring bearing for acompression spring 29. A second spring bearing for thecompression spring 29 is formed by asecond support disk 30, which is supported on the front face of thedriving spline 26. Thecompression spring 29 thus exerts, on the one hand, on the common drive shaft 2 and, on the other hand, on the cylinder drum 24 a force in the respectively opposed axial direction. The common drive shaft 2 is loaded such that the outer race of the roller bearing 3 is supported on the lockingring 19. - The
compression spring 29 acts in the opposite direction on thecylinder drum 24 which is retained by aspherical recess 31 configured on the front face of thecylinder drum 24 in abutment against acontrol plate 32. Thecontrol plate 32 bears, in turn, with the face remote from thecylinder drum 24 sealingly against the connecting plate 5. Thecylinder drum 24 is centred by means of thespherical recess 31, which corresponds to a matching spherical projection of thecontrol plate 32. Thecontrol plate 32 may also be designed as a planar disk if, for example, a centring of thecylinder drum 24 carried out in a different manner with aspherical control plate 32 might lead to redundancy. - Cylinder bores 33 are introduced into the
cylinder drum 24, distributed over a common pitch circle, in which pistons 34 are arranged which are longitudinally displaceable in the cylinder bores 33. On the end remote from thespherical recess 31, the pistons 34 project partially out of thecylinder drum 24. At this end, fastened to the pistons 34 is one respective slidingshoe 35, via which the pistons 34 are supported on a bearingsurface 36 of aswash plate 37. - For generating a lifting motion of the pistons 34, the angle which the bearing
surface 36 of theswash plate 37 encloses with acentral axis 40 is variable. To this end, the inclination of theswash plate 37 may be adjusted by an adjusting device 38. Theswash plate 37 is supported in the housing 4 for absorbing the forces which are transmitted by the slidingshoes 35 to theswash plate 37. - For connecting the hydrostatic piston machine 1 to a first hydraulic circuit and to a second hydraulic circuit a
first connection 39 and asecond connection 39′ are shown diagrammatically in the connecting plate 5 which, in a manner not shown, may be connected via thecontrol plate 32 to the cylinder bores 33. - An enlarged view of the components cooperating in the interior of the housing 4 is shown in
FIG. 2 . - For carrying out a swivelling movement, the
swash plate 37 is coupled to aslide block 44 which, in a manner not shown, rotates theswash plate 37 about a swivelling axis located in the drawing plane. - The cylinder bores, generally denoted by 33 in
FIG. 1 , are divided into a first group of cylinder bores 33.1 and a second group of cylinder bores 33.2. As has already been briefly explained in the embodiments ofFIG. 1 , one respective slidingshoe 35 is arranged against the end of the pistons 34 remote from thecontrol plate 32. The slidingshoe 35 is fastened by a recess to a spherical head of the piston 34, so that the slidingshoe 35 is movably fixed to the piston 34 and tensile and compressive forces may be transmitted. - Configured on the sliding
shoe 35 is a sliding surface 45 by means of which the slidingshoe 35 and thus the piston 34 are supported on the bearingsurface 36 of theswash plate 37. Formed in the sliding surface 45 are lubricating oil grooves which are connected via alubricating oil channel 46, which is configured in the slidingshoe 35 and extended in the piston 34 as a lubricating oil bore 46′, to the cylinder bores 33 configured in thecylinder drum 24. - By supporting the sliding
shoe 35 on the bearingsurface 36, during the rotation of the common drive shaft 2, the pistons 34 execute a lifting movement between a top dead centre and a bottom dead centre, by means of which the pressure medium located in the cylinder chambers in thecylinder drum 24 is placed under pressure. The slidingshoes 35 are hydrostatically relieved on the bearingsurface 36 of theswash plate 37. - In order to deliver the pressure medium from the cylinder chambers into the first and/or second hydraulic circuit, respectively first connecting channels 47.1 and/or second connecting channels 47.2 are connected to the cylinder bores of the first group 33.1 and/or the cylinder bores of the second group 33.2. The first and second connecting channels 47.1 and 47.2 extend from the cylinder bores of the first group 33.1 and/or the cylinder bores of the second group 33.2 to the
spherical recess 31, which is configured on afront face 48 of thecylinder drum 24. - Configured in the
control plate 32 arefirst control slots control plate 32 in the axial direction. - Moreover, second control slots are configured in the
control plate 32, which as a result of the position of the cutting plane are not visible inFIG. 2 . Whilst thefirst control slots - The
first control slots central axis 40 of thecylinder drum 24, which is greater than the distance R2 which, in turn, is identical for the second control slots. During a rotation of the common drive shaft 2, the first connecting channels 47. 1 are connected in succession to the first kidney-shapedcontrol ports 50 and the second kidney-shapedcontrol ports 51, so that as a result of the lifting movement of the pistons 34 arranged in the cylinder bores 33.1 of the first group, the pressure medium is drawn in via the onefirst control slot 51 and pumped via the otherfirst control slot 50 into the working line of the first hydraulic circuit on the pressure side. - In the embodiment shown, the first connecting channels 47.1 are arranged in the
cylinder drum 24, such that the first distance R1 of the outlet on thefront face 48 is greater than the second distance R2 at which the second connecting channels 47.2 open out on thefront face 48. The second connecting channels 47.2 have a radial directional component and accordingly open out on thefront face 48 of thecylinder drum 24 at the second distance R2, which corresponds to the distance of the second control slot from thecentral axis 40. During a rotation of the common drive shaft 2, therefore, the cylinder bores of the second group 33.2 are alternately connected via the second connecting channels 47.2 to the two second control slots. - In order to prevent the sliding
shoes 35 from lifting off the bearingsurface 36 of theswash plate 37 during a suction stroke, aretraction plate 52 is provided which encompasses the slidingshoes 35 on a shoulder provided therefor. Theretraction plate 52 comprises, for example, a spherical central recess 53 with which it is supported against aretraction ball 54, which is arranged on the end of thecylinder drum 24 remote from thefront face 48. - In
FIG. 3 it is shown how, proceeding from an axial piston machine ofFIGS. 1 and 2 , with aswash plate 37′ an independent adjustment of the delivery rates may be achieved for the two hydraulic circuits. - The
swash plate 37′ may be inclined about afirst swivelling axis 55 and about asecond swivelling axis 56. The first and the second swivelling axes 55 and 56 are located in the plane of the bearingsurface 36 of theswash plate 37 and, when the axial piston machine is set to zero volumetric displacement in both hydraulic circuits, enclose an angle of 90° with thecentral axis 40. - In
FIG. 3 theswash plate 37′ is shown inclined about thesecond swivelling axis 56. Thus an effective stroke for delivering pressure medium, for example into the second hydraulic circuit, is produced. The term “effective stroke” in this case denotes a movement of the pistons 34 which leads to an actual delivery of pressure medium. - The second connecting ducts 47.2 move during a half revolution of the
cylinder drum 24 from the bottom dead centre to the top dead centre, substantially along the onesecond control slot 57 so that the pressure medium is forced into the working line of the second hydraulic circuit on the pressure side. During the second half of a revolution of thecylinder drum 24, accordingly the second connecting ducts 47.2 move en route from the top dead centre to the bottom dead centre substantially along the othersecond control slot 58 and perform a suction stroke. - In the embodiment shown, the
first swivelling axis 55 and thesecond swivelling axis 56 are arranged at right angles to one another. - A delivery into the first hydraulic circuit does not occur with the illustrated deflection of the
swash plate 37′. The position of thefirst control slots common swash plate 37′ in the first hydraulic circuit only one pulsation is produced as long as theswash plate 37′ is not additionally inclined about thefirst swivelling axis 55. - For a delivery exclusively into the first or the second hydraulic circuit, the first and the
second control slots control plate 32 rotated by 90° relative to one another. Thesecond control slots projection 56′ of thesecond swivelling axis 56 into the plane of thecontrol plate 32. Thefirst control slots first swivelling axis 55. This is, however, a drawback for a variable adjustment of the delivery rates of both circuits. - In the preferred embodiment shown, the
first swivelling axis 55 and thesecond swivelling axis 56 are arranged at right angles to one another, the two swivellingaxes surface 36. The point of intersection of thefirst swivelling axis 55 with thesecond swivelling axis 56 coincides with the point of intersection of both swivellingaxes central axis 40. - On its face remote from the bearing
surface 36, theswash plate 37′ is configured to be of hemispherical shape, at least in aregion 59 adjoining the bearingsurface 36. As a bearing, a ball bearing or a plain bearing may be provided in order to support theswash plate 37′ and to permit the rotation thereof. In order to keep the overall axial length of the axial piston machine as short as possible, thehemispherical region 59 is defined by a flattenedportion 63 preferably configured parallel to the bearingsurface 36. - The adjustment of the inclination of the
swash plate 37′ may be carried out either via a separate adjusting device for each swivellingaxis FIG. 1 only the adjusting device for the swivellingaxis 55 being shown and the adjusting device for the swivellingaxis 56 not being visible in the sectional view, or however via a common adjusting device via which a resulting angle of inclination of theswash plate 37′ is set. - In
FIG. 4 it is shown that theswash plate 37′ is located in its neutral position relative to thesecond swivelling axis 56, but is inclined relative to itsfirst swivelling axis 55. Thus an effective stroke is produced only for the pistons 34 which are alternately connected via the first connecting channels 47.1 during a revolution of thecylinder drum 24 to the onefirst control slot 50 and the otherfirst control slot 51. - Those pistons, however, which may be connected via the second connecting ducts 47.2 to the
second control slots 57 and/or 58, in the region in which a connection is made to the respective hydraulic circuit, execute merely one movement about the bottom dead centre and/or about the top dead centre, which in turn produces merely a slight pulsation in the working lines of the second hydraulic circuit. - An embodiment for an
adjustable control plate 32′ is shown inFIG. 5 . In the perspective view of thecontrol plate 32′ the face of thecontrol plate 32′ oriented toward the connecting plate 5 of the hydrostatic piston machine 1 is shown. Thecontrol plate 32′ comprises a firstcontrol plate ring 70 and a secondcontrol plate ring 71. The firstcontrol plate ring 70 and the secondcontrol plate ring 71 are arranged in a common plane and together form thecontrol plate 32′. To this end, the external diameter of the secondcontrol plate ring 71 is dimensioned such that the secondcontrol plate ring 71 may be arranged in a central recess of the firstcontrol plate ring 70. In the embodiment shown, the firstcontrol plate ring 70 and the secondcontrol plate ring 71 form a internal gear wheel and/or a sun wheel of a planetary gear set. For creating a rotational movement on the first control plate ring 70 afirst toothing 72 is configured on the outer front face. - A second toothing 73 is configured relative to the internal peripheral edge of the first
control plate ring 70 which is set back in the radial direction, over a portion of the depth of the firstcontrol plate ring 70. Accordingly, relative to the outer peripheral edge of the secondcontrol plate ring 71 which is set back in the radial direction, athird toothing 74 is formed on the secondcontrol plate ring 71. Arranged between the second toothing 73 of the firstcontrol plate ring 70 and thethird toothing 74 of the secondcontrol plate ring 71 are planetary gears 75.1, 75.2 and 75.3. For the sake of improved clarity, the bearing arrangement of the planetary gears 75.1, 75.2 and 75.3 is not shown. The planetary gears 75.1, 75.2 and 75.3 are rotatable about their central axes but fixedly arranged in the housing 4 of the piston machine 1. - The two
first control slots second control slots 57 and/or 58 are formed by control slot portions 57.1 to 57.4 and/or 58.1 to 58.4. Firstdead centre regions 86 and/or 87 are formed between the control slot portions 50.1 to 50.4 and the control slot portions 51.1 to 51.4. In a corresponding manner, seconddead centre regions 88 and/or 89 are formed between the second control slot portions 57.1 to 57.4 and 58.1 to 58.4. In the hydrostatic piston machine according to the invention, the position of said firstdead centre regions dead centre regions 88 and/or 89 are adapted to the top and bottom dead centre positions resulting from the inclination of theswash plate 37. - In the embodiment shown in
FIG. 5 , the adaptation of thedead centre regions control plate ring 70 is, to this end, transmitted in the planetary gear set in which the planetary gears 75.1 to 75.3 are fixedly arranged, in the reverse direction onto the secondcontrol plate ring 71. - An adjusting
element 76 is provided for producing the drive torque on the firstcontrol plate ring 70. In the embodiment shown, the adjustment both of the first adjustingcontrol plate ring 70 and of the secondcontrol plate ring 71 is therefore produced by asingle adjusting element 76. The adjustingelement 76 comprises ashaft 77 which carries, on a first end, afirst spur gear 78 and, on its second end, asecond spur gear 79. The twospur gears shaft 77 fixedly in terms of rotation which, in a manner not shown, is mounted in the connecting plate 5 of the hydrostatic piston machine 1. A rotational movement of theshaft 77 is transmitted to the firstcontrol plate ring 70 via thefirst spur gear 78 which is in engagement with thefirst toothing 72 of the firstcontrol plate ring 70. The rotational movement of theshaft 77 is produced on thesecond spur gear 79, the toothing on the front face of thesecond spur gear 79 cooperating with agear rack 80. - The
gear rack 80 is preferably axially displaceably arranged in the connecting plate 5 and may be acted upon at its two front faces 81, 82, for example by a hydraulic force. Thegear rack 80 is preferably mounted sealingly in the connecting plate 5 in the region of its opposing ends through afirst guide region 83 and asecond guide region 84. Configured on the two front faces 81 and 82, in the connecting plate 5, are pressure chambers, through which the firstfront face 81 and/or the secondfront face 82 may be acted upon by a hydraulic force. Depending on an axial force on thegear rack 80, resulting from a difference between the hydraulic forces on the front faces 81 and 82, thegear rack 80 is displaced and produces a rotational movement of the adjustingelement 76 which, with thesecond spur gear 79, is in engagement with agear rack toothing 85. Within the scope of the maximum axial displacement, therefore, a displacement of the relative position of the firstcontrol plate ring 70 and thus of thefirst control slots swash plate 37 is possible. At the same time, by the formation of thecontrol plate 32′ as a planetary gear set, an opposing alteration to the relative position of the secondcontrol plate ring 71 is effected. - The arrangement of
FIG. 5 is shown inFIG. 6 from the rear. Thus the face of thecontrol plate 32′ oriented toward thecylinder drum 24 is shown inFIG. 6 . It may be seen that the first control slot portions 50.1 to 50.4 and 51.1 to 51.4 on this face are connected tofirst control slots 50 and/or 51. Accordingly, the second control slot portions 57.1 to 57.4 and/or 58.1 to 58.4 are connected tosecond control slots 57 to 58. Between thefirst control slots dead centre regions 86′, 871 may be seen clearly and between thesecond control slots dead centre regions 88′, 89′ may be seen clearly. Moreover, it may be seen inFIG. 6 that on the face oriented towards thecylinder drum 24 the internal diameter d1 of the firstcontrol plate ring 70 corresponds to the external diameter D2 of the secondcontrol plate ring 71, so that the firstcontrol plate ring 70 is centred on the secondcontrol plate ring 71. This is advantageous, in particular, when the internal diameter d2 of the secondcontrol plate ring 71 is dimensioned such that a centring is carried out on the plain bearing 6. - A second embodiment for an adjustable control plate is shown in
FIG. 7 . In the second embodiment, thefirst toothing 72 of the firstcontrol plate ring 70 cooperates with afirst adjusting element 76′. Thefirst adjusting element 76 is driven by thedrive element 80 in the same manner as has already been explained with reference toFIG. 5 . The dependent adjustment of the firstcontrol plate ring 70′ and the secondcontrol plate ring 71′ takes place, however, not by forming the firstcontrol plate ring 70′ as an internal gear wheel and the secondcontrol plate ring 71′ as a sun wheel of a planetary gear set, but by asecond adjusting element 90 which directly drives the secondcontrol plate ring 71′. The secondcontrol plate ring 71′ is, to this end, provided on its inner periphery with afourth toothing 91 which cooperates with afirst spur gear 92 of thesecond adjusting element 90. In a similar manner to the first adjustingelement 76′, thesecond adjusting element 90 is also constructed with ashaft 93, thefirst spur gear 92 as well as asecond spur gear 94 of thesecond adjusting element 90 being arranged on the opposing ends thereof. The two adjustingelements element 76 to thesecond adjusting element 93, the second spur gears 79 and 94 of the first adjustingelement 76 and/or of thesecond adjusting element 90 are connected to one another via a spur gear unit. In the simplest case, the spur gear comprises a singleintermediate gear 95. Theintermediate gear 95 is also arranged in the connecting plate 5, in a manner not shown. In the preferred embodiment shown, thesecond adjusting element 90 is adapted to the first adjustingelement 76 insofar as the resulting rotational movement of the firstcontrol plate ring 70 and of the secondcontrol plate ring 71 is identical. - With a suitable choice of gear ratio of the spur gear unit, by the actuation of the
drive element 80, different alterations to the position of the first andsecond control slots - In the third embodiment shown in
FIG. 8 , asingle adjusting element 76 and/or 90 is in turn associated with eachcontrol plate ring 70′, 71′. In contrast to the embodiment ofFIG. 7 , for driving the adjustingelements 76 and/or 90 respectively oneseparate gear rack 80 is provided as a drive element and/or 96. In this case, thesecond drive element 96 cooperates via a spur gear unit with thefurther spur gear 95′. With the arrangement shown inFIG. 8 it is possible to adjust the firstcontrol plate ring 70 and the secondcontrol plate ring 71 completely independently of one another with regard to their relative position to the swivelling axis of theswash plate 37 of the hydrostatic piston machine 1. The impingement of thesecond gear rack 96 takes place preferably also hydraulically with an actuating pressure in the connecting plate 5. - With the proposed embodiments for
adjustable control plates 32′ it is possible to adapt the position of the first and/or seconddead centre regions - Depending on the volumetric displacement set respectively for the first and/or second hydraulic circuit, the resulting swivelling axis, which results from the inclination of the
swashplate 37 about thefirst swivelling axis 55 and thesecond swivelling axis 56, is variable. Accordingly, the position of the top and/or bottom dead centre of the pistons 34 is altered in the cylinder bores 33.1, 33.2 of the first as well as the second group. By means of theadjustable control plate 32′, according to one of the embodiments ofFIGS. 5 to 8 , an adaptation of the position of thefirst control slots second control slots dead centre regions dead centre regions - The invention is not restricted to the embodiments shown. In particular it is possible to combine individual features of the individual embodiments in any manner with one another.
Claims (12)
1. Hydrostatic piston machine comprising a cylinder drum rotatably arranged in a housing having a first group of cylinder bores which are temporarily connected to a first hydrostatic circuit via first control slots of a control plate, when the cylinder drum is rotated, and having a second group of cylinder bores which are temporarily connected to a second circuit via second control slots of the control plate when the cylinder drum is rotated, pistons being longitudinally displaceably arranged in the cylinder bores which are supported on a swash plate, the swash plate being able to be inclined about at least one swivelling axis for producing a piston stroke, characterised in that the position of the first and/or second control slots may be altered relative to the at least one swivelling axis.
2. Hydrostatic piston machine according to claim 1 , wherein the alteration of the relative position of the first control slots and the alteration of the relative position of the second control slots differ from one another.
3. Hydrostatic piston machine according to claim 1 , wherein the alteration of the relative position of the first control slots and the alteration of the relative position of the second control slots are interdependent.
4. Hydrostatic piston machine according to claim 3 , wherein the position of the first control slots and the position of the second control slots may be altered in the same direction.
5. Hydrostatic piston machine according to claim 3 , wherein the relative position of the first control slots and the relative position of the second control slots may be altered in an opposing manner.
6. Hydrostatic piston machine according to claim 1 , wherein the relative position of the first control slots and the relative position of the second control slots may be altered independently of one another.
7. Hydrostatic piston machine according to, claim 1 , wherein the control plate comprises a first control plate ring and comprises a second control plate ring, the first control slots being arranged in the first control plate ring and the second control slots being arranged in the second control plate ring.
8. Hydrostatic piston machine according to claim 7 , wherein the first control plate ring is configured as a spur gear and/or the second control plate ring is configured as an internal gear wheel, and at least one of the two control plate rings cooperates with a toothing of an adjusting element.
9. Hydrostatic piston machine according to claim 8 , wherein the first control plate ring is an internal gear wheel of a planetary gear set and the second control plate ring is a sun wheel of a planetary gear set.
10. Hydrostatic piston machine according to claim 8 , wherein the internal gear wheel and the spur gear cooperate with toothings of a first adjusting element and/or a second adjusting element.
11. Hydrostatic piston machine according to claim 10 , wherein the first and the second adjusting elements are coupled together by a spur gear unit.
12. Hydrostatic piston machine according to claim 10 , wherein the first and the second adjusting elements are respectively driven by a toothed rack.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006016771.6 | 2006-04-10 | ||
DE102006016771 | 2006-04-10 | ||
DE102006021570A DE102006021570A1 (en) | 2006-04-10 | 2006-05-09 | Hydrostatic piston machine with rotating control disc |
DE102006021570.2 | 2006-05-09 | ||
PCT/EP2007/003111 WO2007118624A1 (en) | 2006-04-10 | 2007-04-05 | Hydrostatic piston engine with rotatable control disc |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090084258A1 true US20090084258A1 (en) | 2009-04-02 |
Family
ID=38121965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/280,968 Abandoned US20090084258A1 (en) | 2006-04-10 | 2007-04-05 | Hydrostatic piston machine comprising a rotatable cam disk |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090084258A1 (en) |
EP (1) | EP2004996A1 (en) |
JP (1) | JP2009531590A (en) |
KR (1) | KR20080108078A (en) |
DE (1) | DE102006021570A1 (en) |
WO (1) | WO2007118624A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090013864A1 (en) * | 2003-10-23 | 2009-01-15 | Brueninghaus Hydromatic Gmbh | Connecting Plate of a Hydrostatic Machine and Method for Producing the Connecting Plate |
US20100322789A1 (en) * | 2006-12-29 | 2010-12-23 | Robert Bosch Gmbh | Axial piston engine having a housing with a radially widened interior portion |
US20130195687A1 (en) * | 2010-10-12 | 2013-08-01 | Innas Bv | Hydraulic device including a face plate |
CN105074206A (en) * | 2013-01-08 | 2015-11-18 | 技术推进公司 | Hydraulic machine comprising a precompression chamber and a second tilt angle |
US20160069342A1 (en) * | 2014-09-05 | 2016-03-10 | Caterpillar Inc. | Valve Plate Arrangement for an Axial Piston Pump |
CN107387351A (en) * | 2017-09-04 | 2017-11-24 | 杭州力龙液压有限公司 | Plunger assembly, plunger pump and hydraulic transmission |
US10233899B2 (en) * | 2016-04-11 | 2019-03-19 | Robert Bosch Gmbh | Hydrostatic axial piston machine |
US10830221B2 (en) | 2016-05-19 | 2020-11-10 | Innas Bv | Hydraulic device, a method of manufacturing a hydraulic device and a group of hydraulic devices |
US10914172B2 (en) | 2016-05-19 | 2021-02-09 | Innas Bv | Hydraulic device |
US10920757B2 (en) * | 2018-07-12 | 2021-02-16 | Kobe Steel, Ltd. | Liquid pressure rotary machine |
US11067067B2 (en) | 2016-05-19 | 2021-07-20 | Innas Bv | Hydraulic device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008009815B4 (en) | 2008-02-19 | 2016-09-29 | Robert Bosch Gmbh | Retraction ball for a hydrostatic piston engine and system of such a retraction ball and a plurality of springs |
US20160131118A1 (en) * | 2014-11-06 | 2016-05-12 | Robert Bosch Gmbh | Tandem axial piston pump with shared cylinder block |
DE102018202716A1 (en) * | 2018-02-22 | 2019-08-22 | Mahle International Gmbh | Axial piston machine with a rotatable control disk seat |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3807283A (en) * | 1970-05-18 | 1974-04-30 | Cessna Aircraft Co | Axial piston pump or motor |
US4449444A (en) * | 1980-07-15 | 1984-05-22 | Linde Aktiengesellschaft | Axial piston pumps |
US4466338A (en) * | 1981-06-26 | 1984-08-21 | Hydromatik Gmbh | Oblique-shaft axial piston machine having a follower plate for the cylinder drum |
US6422831B1 (en) * | 1999-10-12 | 2002-07-23 | Aida Engineering Co., Ltd. | Variable displacement piston pump/motor |
US20060008362A1 (en) * | 2004-07-10 | 2006-01-12 | Hugelman Rodney D | Multi-piston pump/compressor |
US7412828B1 (en) * | 2004-09-30 | 2008-08-19 | Hydro-Gear Limited Partnership | Adjustable hydraulic motor apparatus |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1129828B (en) * | 1959-09-18 | 1962-05-17 | Citroen Sa | High pressure axial piston pump with rotating cylinder drum and swiveling swivel plate |
DE2101078A1 (en) * | 1971-01-12 | 1972-08-03 | Robert Bosch Gmbh, 7000 Stuttgart | Axial piston machine |
DE3127610A1 (en) * | 1980-07-15 | 1983-01-20 | Linde Ag, 6200 Wiesbaden | Axial-piston pump for two delivery streams |
DE3413867C2 (en) * | 1983-04-13 | 1995-04-06 | Linde Ag | Axial piston pump for two flow rates |
DE10358728B4 (en) * | 2003-12-15 | 2006-01-05 | Brueninghaus Hydromatik Gmbh | Axial piston machine for independent pumping in several hydraulic circuits |
JP2005226550A (en) * | 2004-02-13 | 2005-08-25 | Shin Caterpillar Mitsubishi Ltd | Hydraulic device |
-
2006
- 2006-05-09 DE DE102006021570A patent/DE102006021570A1/en not_active Withdrawn
-
2007
- 2007-04-05 WO PCT/EP2007/003111 patent/WO2007118624A1/en active Application Filing
- 2007-04-05 KR KR1020087016575A patent/KR20080108078A/en not_active Application Discontinuation
- 2007-04-05 US US12/280,968 patent/US20090084258A1/en not_active Abandoned
- 2007-04-05 JP JP2009501972A patent/JP2009531590A/en active Pending
- 2007-04-05 EP EP07724052A patent/EP2004996A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3807283A (en) * | 1970-05-18 | 1974-04-30 | Cessna Aircraft Co | Axial piston pump or motor |
US4449444A (en) * | 1980-07-15 | 1984-05-22 | Linde Aktiengesellschaft | Axial piston pumps |
US4466338A (en) * | 1981-06-26 | 1984-08-21 | Hydromatik Gmbh | Oblique-shaft axial piston machine having a follower plate for the cylinder drum |
US6422831B1 (en) * | 1999-10-12 | 2002-07-23 | Aida Engineering Co., Ltd. | Variable displacement piston pump/motor |
US20060008362A1 (en) * | 2004-07-10 | 2006-01-12 | Hugelman Rodney D | Multi-piston pump/compressor |
US7794212B2 (en) * | 2004-07-10 | 2010-09-14 | Hugelman Rodney D | Multi-piston pump/compressor |
US7412828B1 (en) * | 2004-09-30 | 2008-08-19 | Hydro-Gear Limited Partnership | Adjustable hydraulic motor apparatus |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090013864A1 (en) * | 2003-10-23 | 2009-01-15 | Brueninghaus Hydromatic Gmbh | Connecting Plate of a Hydrostatic Machine and Method for Producing the Connecting Plate |
US20100322789A1 (en) * | 2006-12-29 | 2010-12-23 | Robert Bosch Gmbh | Axial piston engine having a housing with a radially widened interior portion |
US20130195687A1 (en) * | 2010-10-12 | 2013-08-01 | Innas Bv | Hydraulic device including a face plate |
CN105074206A (en) * | 2013-01-08 | 2015-11-18 | 技术推进公司 | Hydraulic machine comprising a precompression chamber and a second tilt angle |
US20160069342A1 (en) * | 2014-09-05 | 2016-03-10 | Caterpillar Inc. | Valve Plate Arrangement for an Axial Piston Pump |
US9803634B2 (en) * | 2014-09-05 | 2017-10-31 | Caterpillar Inc. | Valve plate arrangement for an axial piston pump |
US10233899B2 (en) * | 2016-04-11 | 2019-03-19 | Robert Bosch Gmbh | Hydrostatic axial piston machine |
US10830221B2 (en) | 2016-05-19 | 2020-11-10 | Innas Bv | Hydraulic device, a method of manufacturing a hydraulic device and a group of hydraulic devices |
US10914172B2 (en) | 2016-05-19 | 2021-02-09 | Innas Bv | Hydraulic device |
US11067067B2 (en) | 2016-05-19 | 2021-07-20 | Innas Bv | Hydraulic device |
CN107387351A (en) * | 2017-09-04 | 2017-11-24 | 杭州力龙液压有限公司 | Plunger assembly, plunger pump and hydraulic transmission |
US10920757B2 (en) * | 2018-07-12 | 2021-02-16 | Kobe Steel, Ltd. | Liquid pressure rotary machine |
Also Published As
Publication number | Publication date |
---|---|
KR20080108078A (en) | 2008-12-11 |
EP2004996A1 (en) | 2008-12-24 |
JP2009531590A (en) | 2009-09-03 |
DE102006021570A1 (en) | 2007-10-18 |
WO2007118624A1 (en) | 2007-10-25 |
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Legal Events
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AS | Assignment |
Owner name: BRUENINGHAUS HYDROMATIK GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STOELZER, RAINER;REEL/FRAME:021452/0424 Effective date: 20080521 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |