EP1573201A2 - Machine a pistons axiaux - Google Patents

Machine a pistons axiaux

Info

Publication number
EP1573201A2
EP1573201A2 EP03767796A EP03767796A EP1573201A2 EP 1573201 A2 EP1573201 A2 EP 1573201A2 EP 03767796 A EP03767796 A EP 03767796A EP 03767796 A EP03767796 A EP 03767796A EP 1573201 A2 EP1573201 A2 EP 1573201A2
Authority
EP
European Patent Office
Prior art keywords
piston
wrap
machine according
axial piston
piston machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP03767796A
Other languages
German (de)
English (en)
Inventor
Volker Seipel
Willi Parsch
Georg Weber
Peter Barth
Henry Wittkopf
Peter Kuhn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ixetic Bad Homburg GmbH
Original Assignee
LuK Fahrzeug Hydraulik GmbH and Co KG
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 LuK Fahrzeug Hydraulik GmbH and Co KG filed Critical LuK Fahrzeug Hydraulik GmbH and Co KG
Publication of EP1573201A2 publication Critical patent/EP1573201A2/fr
Ceased legal-status Critical Current

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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878—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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878—Pistons
    • F04B27/0882—Pistons piston shoe retaining means
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1045—Cylinders
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1054—Actuating elements
    • F04B27/1072—Pivot mechanisms
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1081—Casings, housings
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/109—Lubrication
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/14—Provisions for readily assembling or disassembling
    • 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
    • F05B2210/12—Kind or type gaseous, i.e. compressible
    • 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
    • F05B2230/00—Manufacture
    • F05B2230/90—Coating; Surface treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Definitions

  • the invention relates to an axial piston machine, in particular an air conditioning compressor for motor vehicles, with at least one piston with an essentially cylinder-shaped piston shaft and with a wrap-around which encompasses a swivel ring or a swivel disk and piston shoes sliding on this swivel ring or this swivel disk, the wrap-around on on the piston skirt side and on the opposite side has spherical dome-shaped recesses for receiving the piston shoes.
  • Such axial piston machines are known. They have the disadvantage that special machines or special devices are necessary for machining the spherical shape of the spherical cap-shaped depressions in the encirclement of the piston. Machining takes place in an interrupted cut, which means that the cutting tool moves out of the workpiece and back in again during machining. In the known machining methods, it is also not economically feasible to install lubricating wedge chamfers on the edges of the spherical shape. In the known processes, the spherical shape is machined in the wrap with a fixed tension of the cylinder axis of the piston.
  • the piston grips protrude fairly far outward radially with respect to the piston axis, so that there is sufficient space for the movement of the swivel plate or the swivel ring and the piston shoes, with sufficient rigidity to prevent the piston shoes from falling out.
  • the lubrication of the radially outer sliding surface of the wrap between the piston and the housing is also of great importance, in particular if Use of the refrigerant C0 2 , due to the high pressures, the dimensions of the machines are smaller than with conventional refrigerant compressors.
  • the narrow installation spaces in a CO 2 compressor ensure that the gaps between the pistons, in which, for example, lubricant can be distributed in the engine compartment, become narrower.
  • an axial piston machine in particular an air conditioning compressor for motor vehicles, with at least one piston with an essentially cylindrical piston shaft and with a wrap-around which grips a swivel ring or a swivel plate and piston shoes sliding on this swivel ring or on this swivel plate, wherein the wrap on the piston skirt side and on the opposite side has spherical dome-shaped recesses for receiving the piston shoes and wherein the side of the wrap opposite the piston shaft has an opening.
  • An axial piston machine is preferred in which the axis of the opening is congruent with the axis of the piston shaft.
  • an axial piston machine in which the opening is essentially cylindrical.
  • An axial piston machine is also preferred, in which a tool for processing the spherical cap-shaped recesses can be passed through the opening.
  • An axial piston machine according to the invention is characterized in that the machining movement for producing the spherical shape of the spherical cap-shaped depressions can be generated by rotating the piston about the axis of the piston skirt, that is to say about the cylinder axis. The makes it possible to produce the spherical cap shapes in a turning process on standard lathes.
  • a further axial piston machine is characterized in that a centering hole or a centering center or a hole for saving weight can be arranged on the piston skirt side of the wrap opposite the wrap-around side with the opening.
  • a piston is preferred in which a coating of the piston on turning and grinding machines can be machined in a very stable tension by using the centering center.
  • an axial piston machine is preferred in which the spherical cap depressions can be produced by turning plates with a finished spherical contour.
  • An axial piston machine is also preferred, in which the piston can be produced in one piece and in solid form from an aluminum material.
  • An axial piston machine is characterized in that a first spherical recess is arranged within the bridge of the wrap-around, that is to say in the inner radial region of the piston wrap.
  • An axial piston machine is preferred in which the first spherical recess can be produced by turning the piston around its cylinder axis and rotating tool during the machining of the spherical shape in the wrap-around.
  • the first spherical recess can be produced by rotating the piston about an axis perpendicular to its cylinder axis and using a non-rotating tool during the machining of the spherical shape in the wrap.
  • the spherical running surfaces of the piston shoes in the wrap-around can pass seamlessly into the first spherical recess in the bridge of the wrap-around and the spherical running surfaces and the first spherical recess can preferably have an equally large spherical radius. Also preferred is a first spherical cutout, which is also machined during machining of the piston shoe contact surfaces. is completely manufactured by this machining.
  • the bridge of the wrap outside of the first spherical recess is preferably adapted on the inside by a second spherical recess with a larger radius to the contour of the swivel ring or swivel plate.
  • the bridge of the wrap-around can be pushed as close as possible to the swivel ring or to the swivel disk through the second spherical recess.
  • the rigidity of the wrap through the first spherical recess is only slightly reduced because the first spherical recess is very close to the bending line.
  • less material and installation space and lower costs are realized.
  • An axial piston machine is characterized in that the cylindrical piston shaft and the wrap represent two individual parts from which the piston can be assembled. This has the advantage that materials and manufacturing methods can be adapted to the different loads for these differently shaped parts.
  • An axial piston machine is also preferred in which the wrap-around can be produced from a sheet metal strip and, after the sheet metal strip has been shaped accordingly, can be connected to the cylindrical piston shaft, which can be produced from sheet metal as a deep-drawn part.
  • An axial piston machine is also preferred, in which the opening can be produced by punching.
  • the piston shoes can also be produced or largely preformed in the process of forming the grip.
  • an axial piston machine is preferred in which the cylindrical piston shaft and the wrap are made of a steel material.
  • An axial piston machine is also preferred, in which the wrap-around and the cylindrical piston shaft can be connected to one another by laser welding or resistance welding. Furthermore, the cavity between the wrap and piston skirt can be airtight or almost airtight.
  • Another embodiment of the axial piston machine according to the invention is characterized in that the piston is initially coated with an adhesive primer coating, such as, for example, after the grip and piston skirt have been assembled. B. by phosphating with a layer thickness of about 2 -3 // m, and then provided with a surface coating of PTFE with a layer thickness of about 10 microns.
  • an axial piston machine in which the outside, as the sliding surface of the wrap, has at least one opening to the inner radial region of the wrap, which faces the swivel plate or the swivel ring.
  • the at least one opening is preferably used to supply lubricant to the sliding surface, because the sliding surface lies in the circumferential area covered by the piston grip and can therefore be poorly supplied with the lubricant contained in the engine casing in the air-conditioning agent.
  • the circumferential region of the piston wrap which is designed as a sliding surface, has a plurality of and / or differently shaped openings or opening regions.
  • An axial piston machine is preferred in which the circumferential region of the piston wrap, which is designed as a sliding surface, has pocket-shaped regions in relation to the engine housing wall serving as a running surface, which regions are supplied by at least one lubrication opening.
  • Figure 1 shows a two-part piston in cross section.
  • Figure 2 shows the same piston in side view.
  • Figure 3 shows the same piston in perspective.
  • Figure 4 shows the processing of the rear spherical cap.
  • Figure 5 shows the processing of the front spherical cap.
  • Figure 6 shows a piston in supervision.
  • Figure 7 shows a piston with a first spherical recess.
  • Figure 8 shows the pressures relevant to the axial forces on the piston.
  • FIG. 9 shows four representations of the first and second spherical cutouts.
  • Figure 10 shows the production of the first spherical recess.
  • Figure 11 shows a piston in a section of a swivel ring machine.
  • Figure 12 shows a cross section through a piston grip.
  • Figure 13 shows a plan view of a piston.
  • FIG. 14 shows the piston arrangement in the engine room.
  • FIG. 15 shows a rotating swivel disk with a device according to the invention
  • Figure 16 shows a piston with a lubricant pocket.
  • the cylindrical piston shaft 3 can preferably be made from thin sheet steel by means of a deep-drawing process.
  • the use of sheet steel has the advantage that the piston skirt can be made thin-walled despite high pressure loads and can advantageously be mass-produced in the deep-drawing process.
  • the blanks of the parts can also be produced by cold extrusion, hot extrusion or forging.
  • the piston wrap 5 can be produced from a sheet steel strip, which is then correspondingly formed in a stamping and bending tool from the flat sheet metal strip to the U-shaped piston wrap.
  • the use of two parts has the Advantage that both components with different basic shapes can be manufactured separately according to their shape and do not have to be formed from a single piece in a much more complex manner.
  • the piston grip 5 can thus also advantageously be made of a steel material, which ensures a significantly higher resistance to the forces occurring during operation.
  • the piston grip 5 has on its side facing away from the piston skirt 3 a cylindrical opening 9, the central axis 11 of which is congruent with the central axis 13 of the cylindrical piston skirt 3.
  • the opening 9 opens into a spherical-spherical region 15, which serves to receive a spherical-spherical piston shoe, not shown here.
  • a spherical cap-shaped area 17 is also attached within the wrap, which can accommodate a second piston shoe, both piston shoes sliding on a swivel disk or a swivel ring arranged between them.
  • the part of the wrap 5 facing the piston skirt 3 is provided with a smaller opening 19, which creates a connection to the interior of the piston skirt 3.
  • the piston shaft 3 is provided at its front end with two grooves 21 which serve to receive piston sealing rings.
  • FIG. 2 it can be seen in the side view of the piston 1 from FIG. 1 that the piston wrap 5 has an inclined step 23 on its upper side, which leads to an elevated area 25 with which the piston 1 is supported in the housing on a corresponding housing sliding surface , Furthermore, the piston shaft 3 has two chamfers 29 and 27, which lead to a region 31 of larger diameter, which acts as a leading cylinder part within a cylinder liner.
  • the axis 13 of the cylindrical piston shaft 3 crosses an axis 33, the point of intersection being the center of a spherical shape of the spherical cap-shaped piston shoes or the bearing areas 15 and 17.
  • FIG. 3 shows a perspective illustration of the piston 1 from FIG. 1 and FIG. 2, which has regions 35 in which a corresponding coating on the steel components by means of an adhesive base, in particular by phosphating the entire piston with a layer thickness of approx. 2 - 3 ⁇ m, and by means of a subsequent sliding coating in the marked areas 35 by PTFE with a layer thickness of approx. 10 ⁇ .
  • an adhesive base in particular by phosphating the entire piston with a layer thickness of approx. 2 - 3 ⁇ m, and by means of a subsequent sliding coating in the marked areas 35 by PTFE with a layer thickness of approx. 10 ⁇ .
  • B. WC / C coatings or heat treatments such as case hardening conceivable.
  • the two-part piston design is preferred in particular because the different shapes of the components can be produced by the manufacturing processes which are optimally adapted to the shapes.
  • a deep-drawing process with thin-walled steel sheet is suitable for the cylindrical piston skirt 3, while for the piston wrap 5 a stamping process with steel sheet with a subsequent bending process corresponding to the shape of the wrap is advantageous.
  • the openings 9 and 19 can also be made beforehand and the spherical cap regions 15 and 17 can be pre-embossed. If necessary, the selection of aluminum materials can also be appropriate.
  • FIG. 4 shows a piston 40 in cross section, the piston 40 being shown in solid form in cross section in this illustration and z. B. can be made of an aluminum material.
  • the piston 40 which also has a cylindrical piston shaft 42 and a wrap-around 44, has an opening 46 at the end of the wrap-around 44 opposite the piston shaft 42, which corresponds to the opening 9 from FIG. Through the opening 46, it is possible to insert a cutting tool 48 into the interior of the piston grip 44.
  • the rear spherical cap 54 can thus be produced on standard lathes by the machining movement, which is not possible with known wrap-around shapes without such an opening 46.
  • a centering center 56 or a weight-saving bore (not shown) and a second centering center 58 can also be provided in the piston skirt 42, which center can be used for further processing steps on turning and grinding machines, for example for over-turning or grinding a coating, allow a rigid tension.
  • FIG. 5 shows the processing of the front dome shape 62 in the wrap-around 44. Also through the opening 46 in the wrap-around 44, a cutting tool 60 for machining the front spherical cap 62 is inserted and the spherical cap is then inserted by corresponding axial and vertical movement of the tool 60 with simultaneous rotation 52 of the piston 40 about the axis 50. This means that through the opening 46 in the piston wrap 44, the piston wrap was redesigned such that the cutting movement for machining the spherical shape can be generated by the rotation of the piston 40 about the axis 50 of the piston skirt 42, that is to say the cylinder axis.
  • Tool holders can also be machined on both sides at the same time.
  • FIG. 6 shows a perspective view of a piston 1 with a wrap 5 with a first spherical recess 80 in the bridge of the wrap 5.
  • first spherical recess 80 which can be produced during the manufacture of the support surfaces 62 and, not visible here, 54 for the piston shoes during machining by rotation about the cylinder axis 50.
  • FIG. 8 shows the pressures and forces acting on the piston 1 and piston wrap 44, 5 during the suction stroke.
  • the piston 1 is pulled out of the cylinder block by the swivel ring 82 or by the swivel plate by means of the piston shoes (not shown here).
  • the forces PA which bend the wrap 44, 5 and which are transmitted from the swivel ring 82 and piston shoe to the wrap 44 and 5, respectively, act within the piston wrap 44, 5 due to the movement of the swivel ring 82.
  • the drive chamber pressure PC acts on the cylinder surface of the piston in the area 62 of the piston grip 44, 5.
  • the grip 44 or 5 of the piston 1 thus becomes decisive during operation through a bend loaded during the suction movement.
  • the back of the wrap is pushed radially inward as close as possible to the swivel ring 82 or the swivel disk, the recess 80 projecting so close to the bend line of the wrap with respect to one that projects radially outward Wrap is that the rigidity against the bend during the suction movement is only slightly increased compared to a wrap without a spherical recess 80, which is located radially further out and therefore has larger lever arms for the bend.
  • the back of the wrap 44 or 5 is adapted on its inside by a second spherical recess 81, which can be seen in FIG. 9, to the cylindrical contour of the swivel ring or swivel plate and their movement positions.
  • a second spherical recess 81 which can be seen in FIG. 9, to the cylindrical contour of the swivel ring or swivel plate and their movement positions.
  • FIG. 9a shows a view of the inside of the wrapping 44 or 5.
  • the first spherical cap-shaped depression that is to say the spherical recess 80 in the bridge of the wrapping 44, 5 and a second spherical contour 81, which covers the entire inside of the wrapping, can be seen can take.
  • FIG. 9b shows the section BB from FIG. 9a.
  • the front support surface 62 for the front piston shoe can be seen within the cut wrap 44 or 5.
  • both the sliding elevations 25 from FIG. 6, which serve to bear against the housing contour 86, and the first spherical recess 80 can be seen.
  • the second spherical recess 81 ensures a sufficient distance from the swivel ring contour 84 and the envelope curve given by its swivel movement and that the section BB follows the contour of the swivel ring 84 and the housing 86.
  • FIG. 9c shows that the contact surface 62 or the opposite contact surface 54 can merge seamlessly into the first spherical recess 80 and can form a spherical shape.
  • the second spherical recess 81 can be seen, which is formed with a substantially larger radius than the first spherical recess 80 and is thus adapted to the radius of the envelope curve of the swivel plate or the swivel ring 84 from FIG. 9b.
  • the spherical recess 81 of the inner wrap-around surface can be seen particularly well from the side through the perspective representation. It is also clear that the first spherical recess is also created by the production of the contact surface 62 for the piston shoe.
  • FIG. 10 shows the production of the first spherical recess 80 together with the production of the piston shoe contact surfaces 62 and 54. While a tool is rotated about an axis of rotation 90 within the wrap 44, the piston is rotated about its cylinder axis 50 to produce the spherical shape, the cutting edge of the tool 92 defining the contours of the bearing surfaces 54 and 62 for the piston shoes as well as the spherical one Recess 80 creates.
  • the spherical recess 80 is created when the piston rotates about an axis perpendicular between the tool axis of rotation 90 and the cylinder axis 50, which passes through the point of intersection (center point of the sphere) and a non-rotating tool intersects the contour of the sphere or the contour close to the sphere.
  • FIG. 11 shows a piston 101 which comprises a cylindrical part 102 which can be moved back and forth in the opening of a cylinder block 103 and therefore forms the first sliding surface with the cylindrical outer surface opposite the cylinder block bore 113.
  • the piston 101 continues into a second part 104, which serves as a grip for the swivel plate 106 and the piston shoes 105.
  • the piston 101 is reciprocated over the piston shoes 105, the swivel plate 106 sliding between the flat sides of the piston shoes 105 and the piston shoes 105 themselves performing a kind of wobble movement within the piston grip.
  • the piston wrap 104 in turn slides in the engine housing 107, which is only partially shown, along the inner wall 108 and thus forms a second sliding surface 109.
  • FIG. 12 shows a section through the piston wrap, as described in the invention and shown in a top view in FIG. 13.
  • the second sliding surface 109 is pierced by an opening 111, which serves to convey lubricant sprayed from the interior, in particular by the rotating swivel plate 106 (FIG. 11), by centrifugal forces through the piston grip around the top, that is to say the sliding surface 109 .
  • Below the cut piston wrap area 112 is a sliding surface on the front piston wrap area 114
  • FIG. 13 shows a piston according to the invention in top view.
  • the second part, the piston wrap 104 adjoins the cylindrical piston part 101, which is smaller in diameter than the diameter of the curvature of the wrapping surface 109.
  • the opening 111 provided for the supply of lubricant, here for example with an oval cross-section, which is surrounded by a pocket-shaped recess 116 for receiving the lubricant.
  • This pocket-shaped opening 116 is shown in cross section in FIG. 16.
  • an adjacent piston wrap 104 ' is also indicated, which shows that in a machine according to the invention there is only a very small space 117 between the piston wrap, which cannot be sufficient to supply lubricant for the wrap-around sliding surfaces 109.
  • FIG. 14 six piston wraps are shown as an example in section in a machine. It can be seen that there are only very narrow spaces 117 between the six piston wraps 104 with their sliding surfaces 109. This means that lubricant thrown off a rotating swashplate or swivel plate may not be able to work its way from the spaces 117 to the center of the sliding surfaces 109.
  • the lubricant supply is established through the opening 111 in that lubricant 118 passes from the rotating swashplate or swivel plate or the swivel ring 106 through the opening under the action of centrifugal forces onto the surface 109 and there the second sliding surface 109 between the drive housing wall and can lubricate the radial outer surface of the piston wrap 104.
  • a piston wrap 104 according to the invention is also shown in section, which on the surface 109 has, in addition to the lubricant opening 111, a lubricant pocket 116 which can be designed in different shapes, as required.
  • the purpose of this lubricant pocket is to collect the lubricant that has passed through the opening 111 above the piston grip and thus to adequately supply the sliding surface 109.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

L'invention concerne une machine à pistons axiaux, notamment un compresseur de climatisation, destinée à des véhicules automobiles. Cette machine comprend au moins un piston (1, 40, 101) présentant une tige de piston (3, 42, 102) sensiblement cylindrique et une partie enveloppante (5, 44, 104), qui entoure une bague pivotante (82) ou un disque pivotant (106) et des patins de piston (105) glissant sur cette bague pivotante (82) ou sur ce disque pivotant (106). La partie enveloppante (5, 44, 104) présente, sur le côté tige de piston et sur le côté opposé, des évidements (15, 17, 54, 62) en forme de calottes sphériques, servant à recevoir les patins de piston (105).
EP03767796A 2002-12-13 2003-12-12 Machine a pistons axiaux Ceased EP1573201A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10258311 2002-12-13
DE10258311 2002-12-13
PCT/EP2003/014150 WO2004055370A2 (fr) 2002-12-13 2003-12-12 Machine a pistons axiaux

Publications (1)

Publication Number Publication Date
EP1573201A2 true EP1573201A2 (fr) 2005-09-14

Family

ID=32518936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03767796A Ceased EP1573201A2 (fr) 2002-12-13 2003-12-12 Machine a pistons axiaux

Country Status (8)

Country Link
US (1) US7500425B2 (fr)
EP (1) EP1573201A2 (fr)
JP (1) JP4499572B2 (fr)
KR (1) KR101004237B1 (fr)
CN (1) CN100395449C (fr)
AU (1) AU2003292236A1 (fr)
DE (1) DE10393344D2 (fr)
WO (1) WO2004055370A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502006002752D1 (de) * 2005-04-23 2009-03-19 Ixetic Mac Gmbh Axialkolbenmaschine
DE102010024126A1 (de) * 2010-06-17 2011-12-22 Carl Freudenberg Kg Kolbenspeicher
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WO2004055370A2 (fr) 2004-07-01
KR101004237B1 (ko) 2010-12-24
WO2004055370A3 (fr) 2004-08-19
CN1726344A (zh) 2006-01-25
AU2003292236A1 (en) 2004-07-09
DE10393344D2 (de) 2006-06-01
JP2006509956A (ja) 2006-03-23
JP4499572B2 (ja) 2010-07-07
US20060230922A1 (en) 2006-10-19
KR20050085446A (ko) 2005-08-29
US7500425B2 (en) 2009-03-10

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