WO2014206682A1 - Piston creux pour machine à plateau incliné et machine à plateau incliné - Google Patents

Piston creux pour machine à plateau incliné et machine à plateau incliné Download PDF

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Publication number
WO2014206682A1
WO2014206682A1 PCT/EP2014/061107 EP2014061107W WO2014206682A1 WO 2014206682 A1 WO2014206682 A1 WO 2014206682A1 EP 2014061107 W EP2014061107 W EP 2014061107W WO 2014206682 A1 WO2014206682 A1 WO 2014206682A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
piston
hollow piston
main body
swash plate
Prior art date
Application number
PCT/EP2014/061107
Other languages
German (de)
English (en)
Inventor
David Breuer
Frank Zehnder
Manfred Stoll
Dieter Aulich
Reiner Ramsayer
Mario Matic
Matthias Greiner
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2014206682A1 publication Critical patent/WO2014206682A1/fr

Links

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0082—Details
    • F01B3/0085—Pistons
    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/10—Control of working-fluid admission or discharge peculiar thereto
    • F01B3/103—Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block
    • F01B3/106—Control of working-fluid admission or discharge peculiar thereto for machines with rotary cylinder block by changing the inclination of the swash plate

Definitions

  • the present invention relates to a hollow piston for a swash plate machine according to the preamble of claim 1 and a swash plate machine according to the preamble of claim 9.
  • Swash plate machines serve as axial piston pumps for converting mechanical energy into hydraulic energy and as axial piston motor for converting hydraulic energy into mechanical energy.
  • a cylindrical drum with piston bores is rotatably or rotatably mounted in the swash plate machine and pistons are arranged in the piston bores.
  • the pistons are mounted in the piston bores of the cylinder drum and are generally made of steel for strength reasons as a material.
  • hollow pistons are used, which are known in various designs.
  • a hollow piston which has a main body with a central integrated mandrel, wherein the central mandrel with a Central bore is provided.
  • the cavity in the piston is closed by a lid that is attached to the main body by a welding process.
  • a disadvantage of a hollow piston formed from two components is the complex production for the production of the central bore in the main body.
  • hollow pistons are also known, the cover of which is fastened to the piston body by a friction welding process, this process having disadvantages with regard to the increased material application at the connecting points which is necessary during the friction welding process.
  • the object of the invention is therefore to provide hollow piston and a swash plate machine with hollow piston, which are optimized in terms of their weight and which is inexpensive in terms of production and the choice of materials of the components.
  • the hollow piston for a swash plate machine comprises a main body and a lid disposed at one end of the main body so as to form a closed cavity therewith. Furthermore, the hollow piston comprises a channel penetrating it centrally for the passage of a hydraulic fluid. According to the invention, the channel is formed of a sleeve and this is formed as a separate component, wherein a first end of the sleeve extends into an opening of the main body and the sleeve is connected to the first end of the sleeve with the main body and a second end of Sleeve extends into an opening of the lid and the sleeve is connected to the second end of the sleeve with the lid.
  • the formation of the channel by a separate sleeve allows a simplification of the production of the hollow piston, since this of three separate components (Main body, lid and sleeve) can be produced.
  • the individual components of the so-called built piston can be flexibly adapted to the respective stress in operation with regard to the choice of material. Furthermore, it is advantageous to manufacture the components separately, since simple and therefore cost-effective semi-finished products are sufficient for the production.
  • the main body can be produced, for example, as a turned part, wherein advantageously can be dispensed with the manufacturing step of the central bore.
  • the lid can be made for example as a turned part or as a forged part.
  • the sleeve can be obtained, for example, by the meter in the form of a tube, or be produced by a continuous casting process.
  • the components are interconnected so that the closed cavity pressure and hydraulic-tight.
  • the sleeve is connected to the main body at one
  • Piston joint connected which is arranged at a side facing away from the lid end of the main body and the piston connection point for indirect support of the hollow piston is used on a pivoting cradle of a swash plate machine.
  • the sleeve is connected to the main body and with the lid of the hollow piston in each case via a laser welding connection.
  • the lid also via a laser welding connection with the main body.
  • This allows a reduction in weight compared with friction-welded pistons, since it can be dispensed with a thickening at the welds.
  • it is possible to dispense with holding washers necessary during friction welding.
  • Today's laser welding connections allow a low heat input into the workpiece, resulting in a reduced deformation of the workpiece. As a result, a low soft machining is necessary and consequently a small stock removal for machining. This reduces the costs compared to other welding processes.
  • Advantageous embodiments of the invention have on the cover and / or on the main body at the respective connection point to the sleeve a groove on which the laser welding connection takes place.
  • the piston connection point is advantageously formed in one embodiment from a bearing cup. This serves to receive a condyle, this the hollow piston indirectly via a sliding device on the
  • Swivel cradle of the swash plate machine is supported.
  • the piston connection point of the hollow piston is advantageously formed from a joint head. This is in a bearing cup, which indirectly via a sliding device supports the hollow piston on the pivoting cradle of the swash plate machine, recordable.
  • the swash plate machine according to the invention comprises a cylindrical drum rotatable about its axis of rotation or rotatably mounted with piston bores, with hollow piston according to the invention movably mounted in the piston bores and a pivoting cradle pivotally mounted about a pivot axis.
  • the weight of the swash plate machine can be substantially reduced in a simple manner by the use of the hollow piston according to the invention, so that the friction between the hollow piston and the piston bores, in particular due to centrifugal forces, is thereby reduced.
  • higher rotational speeds are possible and the costs of producing the hollow pistons and, consequently, the swash plate machine can be significantly reduced.
  • the swashplate machine according to the invention can, for example, form a hydraulic system as a hydraulic engine and / or as a hydraulic pump and be used in a vehicle with a hydraulic hybrid drive.
  • the hydraulic hybrid drive may include, for example, an internal combustion engine, a hydraulic system with high and low pressure accumulator and a corresponding transmission.
  • Fig. 1 a longitudinal section of a swash plate machine according to the invention
  • FIG. 2 shows a longitudinal section of a first embodiment of the hollow piston according to the invention
  • FIG 3 shows a longitudinal section of a second embodiment of the hollow piston according to the invention.
  • FIG. 1 shows a swash plate machine 1 according to the invention, as axial piston pump for conversion or conversion of mechanical energy (torque, speed) into hydraulic energy (Volume flow, pressure) or as axial piston motor for conversion or conversion of hydraulic energy (volume flow, pressure) in mechanical energy (torque, speed) can serve.
  • a drive shaft 9 is mounted rotatably or rotatably about a rotation axis 8 by means of a bearing 10 on a flange 21 of a one-part or multi-part housing 4 and with a further bearing 10 on the housing 4 of the swashplate machine 1.
  • a cylinder drum 5 is rotatably connected.
  • the cylinder drum can be slidably or firmly connected in the axial direction.
  • the drive shaft 9 and the cylinder drum 5 are formed in two parts, but may also be formed as a component.
  • the cylinder drum 5 performs the rotational movement of the
  • Piston holes 6 are each a hollow piston 7 movably mounted.
  • Swivel cradle 14 is pivotally mounted about a pivot axis 15 on the housing 4.
  • the pivoting cradle 14 has a flat surface that includes a sliding device 18.
  • each sliding block 37 has a joint ball 39, which is fastened in a bearing socket 59 on the hollow piston 7, so that a piston connection point 22 between the joint ball 39 and the bearing socket 59 is formed on the hollow piston 7 and the hollow piston 7 is formed via the sliding device 18, or supported on the sliding block 37 on the pivoting cradle 14. In a second embodiment of the invention, this is shown inversely.
  • the partially spherical joint ball 39 and bearing cup 59 are both complementary or spherical, so that in a corresponding movement possibility to each other between the ball joint 39 and the bearing cup 59 to the hollow piston 7 as possible a permanent connection between the hollow piston 7 and the slider is present. Due to the connection of the hollow pistons 7 with the rotating cylindrical drum 5 and the connection of the bearing cups 59 with the sliding shoes 37 perform the sliding blocks 37 from a rotational movement about the axis of rotation 8.
  • the pivoting cradle 14 is pivotally mounted about the pivot axis 15 and has an opening 42 for the passage of the drive shaft 9.
  • the pivoting cradle 14 is adjustable via at least one pivoting device 24.
  • the adjustment takes place via adjusting piston 29.
  • the pivoting device 24 can be represented both by two adjusting piston 29 and by an adjusting piston 29 and an opposed piston.
  • FIG. 2 shows a first embodiment of the hollow piston 7 according to the invention.
  • the hollow piston 7 has a main body 17, and a lid 75, which is arranged at one end of the main body 17 such that it forms a closed cavity 62 with this. Furthermore, the hollow piston 7 has a channel 61 penetrating it centrally for the passage of a hydraulic fluid.
  • the channel 61 provides a hydraulic connection between the piston bore 6 in the cylinder drum 5 of the bent axis machine 1 and the sliding device 18 on the pivoting cradle 14 (see Fig. 1).
  • the channel 61 is formed according to the invention from a sleeve 80, which is formed as a separate component. By using the sleeve 80, the blank can be obtained from a tube or from a continuous casting process, can be dispensed with a costly method of deep hole drilling.
  • the sleeve 80 extends with a first end 81 into an opening 71 of the main body 17 (see section A) and is connected thereto with the main body 17.
  • a second end 82 of the sleeve 80 extends into an opening 72 of the lid 75 and is connected thereto at the lid 75 (see section B).
  • the sleeve 80 is thus connected at its one axial end to the main body 17 and at its other axial end to the lid 75.
  • the outer diameter of the sleeve 80 is between 3 and 7 millimeters, preferably between 3-6 and 6 millimeters.
  • the main body 17 has at its end facing away from the lid 75, the piston connection point 22 for indirect support on the pivoting cradle 14.
  • the piston joint 22 is formed in this embodiment of the bearing cup 59, which serves to receive the condyle 39 of the shoe 37.
  • the joint head 39 supports indirectly via the sliding device 18 shown in FIG. 1, the hollow piston 7 on the pivoting cradle 14 from.
  • the lid 75 is connected to the main body 17 via a radial laser weld joint 92.
  • the laser welding connection 92 is designed such that the cavity 62 of the hollow piston 7 is closed pressure and hydraulic-tight.
  • the detail A shows in a detailed view that the sleeve 80 is connected to the main body 17 at a connection point via a laser welding connection 90.
  • the laser welding connection 90 is designed such that the cavity 62 of the hollow piston 7 is pressure-tight and hydraulically sealed.
  • the main body 17 at the point of connection to the sleeve 80 has a groove 95 on which the laser welding connection 90 takes place.
  • the groove 95 is designed so that an expansion of the components to be welded by the heat input of the welding process is avoided as much as possible. As a result, a complex post-processing can be reduced or avoided.
  • the detail B shows in a detailed view that the sleeve 80 is connected to the cover 75 at a connection point via a laser welding connection 91.
  • the laser welding connection 91 is designed such that the cavity 62 of the hollow piston 7 is closed pressure and hydraulic-tight.
  • the cover 75 at the connection point to the sleeve 80 has a groove 96 on which the laser welding connection 91 takes place.
  • the longitudinal section shown in FIG. 3 shows a second embodiment of the hollow piston 7 according to the invention.
  • the hollow piston 7 has a main body 17, and a lid 75, which is arranged at one end of the main body 17 such that it forms a closed cavity 62 with this.
  • the hollow piston 7 has a channel 61 penetrating it centrally for the passage of a hydraulic fluid.
  • the channel 61 provides a hydraulic connection between the piston bore 6 in the cylinder drum 5 of the bent axis machine 1 and the sliding device 18 on the pivoting cradle 14 (see Fig. 1).
  • the channel 61 is formed according to the invention from a sleeve 80, which is formed as a separate component.
  • the sleeve 80 is connected at its one axial end to the main body 17 and at its other axial end to the lid 75.
  • the main body 17 has at its end facing away from the lid 75, the piston connection point 22 for indirect support on the pivoting cradle 14.
  • the piston joint 22 is formed in this second embodiment of an integrally connected to the main body 17 condyle 39. This supports the hollow piston 7 on the pivoting cradle 14 of the swashplate machine 1 via a bearing cup, not shown here, of a sliding shoe of the sliding device 18.
  • the sleeve 80 is connected to the main body 17 at a junction via a laser weld joint 90.
  • the laser welding connection 90 is designed such that the cavity 62 of the hollow piston 7 is pressure and hydraulic sealed.
  • the main body 17 at the point of connection to the sleeve 80 has a groove 95 on which the laser welding connection 90 takes place.
  • the sleeve 80 is connected to the lid 75 at a junction via a laser weld joint 91.
  • the laser welding connection 91 is designed such that the cavity 62 of the hollow piston 7 is pressure-tight and hydraulically sealed.
  • the cover 75 at the connection point to the sleeve 80 has a groove 96 on which the laser welding connection 91 takes place.
  • the lid 75 is connected to the main body 17 via a radial laser weld joint 92.
  • the laser welding connection 92 is designed such that the cavity 62 of the hollow piston 7 is closed pressure and hydraulic-tight.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Piston creux (7) pour machine à plateau incliné (1), comprenant un corps principal (17), une tête (75) qui est disposée à une extrémité du corps principal (17) de manière à former avec celui-ci une cavité (62) fermée, et un canal (61) traversant le centre du piston creux (7) en son centre, destiné à guider un liquide hydraulique. Le canal (61) est formé d'un manchon (80) se présentant sous forme d'une pièce séparée. Une première extrémité (81) du manchon (80) s'étend dans une ouverture (71) du corps principal (17), le manchon (80) étant relié au corps principal (17) par ladite première extrémité (81). Une seconde extrémité (82) du manchon (80) s'étend dans une ouverture (72) de la tête (75), le manchon (80) étant relié à la tête (75) par ladite seconde extrémité (82). Une machine à plateau incliné doté d'un tel piston creux (7) est également un objet de l'invention.
PCT/EP2014/061107 2013-06-24 2014-05-28 Piston creux pour machine à plateau incliné et machine à plateau incliné WO2014206682A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310211888 DE102013211888A1 (de) 2013-06-24 2013-06-24 Hohlkolben für eine Schrägscheibenmaschine und Schrägscheibenmaschine
DE102013211888.0 2013-06-24

Publications (1)

Publication Number Publication Date
WO2014206682A1 true WO2014206682A1 (fr) 2014-12-31

Family

ID=50972640

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/061107 WO2014206682A1 (fr) 2013-06-24 2014-05-28 Piston creux pour machine à plateau incliné et machine à plateau incliné

Country Status (2)

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DE (1) DE102013211888A1 (fr)
WO (1) WO2014206682A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609892A1 (de) * 1985-03-26 1986-10-09 Linde Ag, 6200 Wiesbaden Hohlkolben fuer eine hydrostatische kolbenmaschine und verfahren zu dessen herstellung
DE19620167C1 (de) * 1996-05-20 1997-03-13 Brueninghaus Hydromatik Gmbh Hohlkolben mit radial verschweißtem Deckel
DE19934216A1 (de) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Hohlkolben für eine Kolbenmaschine und Verfahren zum Herstellen eines Hohlkolbens
DE19934217A1 (de) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Kolbenanordnung für eine Kolbenmaschine
EP1336449A2 (fr) * 2002-02-18 2003-08-20 Brueninghaus Hydromatik Gmbh Piston creux et procédé de sa fabrication par soudage, diffusion ou frittage
DE102010032236A1 (de) * 2010-07-26 2012-01-26 Robert Bosch Gmbh Verfahren zur Herstellung eines Hohlkolbens und entsprechender Hohlkolben

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609892A1 (de) * 1985-03-26 1986-10-09 Linde Ag, 6200 Wiesbaden Hohlkolben fuer eine hydrostatische kolbenmaschine und verfahren zu dessen herstellung
DE19620167C1 (de) * 1996-05-20 1997-03-13 Brueninghaus Hydromatik Gmbh Hohlkolben mit radial verschweißtem Deckel
DE19934216A1 (de) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Hohlkolben für eine Kolbenmaschine und Verfahren zum Herstellen eines Hohlkolbens
DE19934217A1 (de) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Kolbenanordnung für eine Kolbenmaschine
EP1336449A2 (fr) * 2002-02-18 2003-08-20 Brueninghaus Hydromatik Gmbh Piston creux et procédé de sa fabrication par soudage, diffusion ou frittage
DE102010032236A1 (de) * 2010-07-26 2012-01-26 Robert Bosch Gmbh Verfahren zur Herstellung eines Hohlkolbens und entsprechender Hohlkolben

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Publication number Publication date
DE102013211888A1 (de) 2014-12-24

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