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
  • F04B1/26—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
• • 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

Definitions

• the invention relates to a reciprocating piston machine according to the preamble of claim 1.
• a generic piston engine comprises a machine housing in which a plurality of pistons are arranged in a circular arrangement around a rotating drive shaft.
• the drive force is transmitted from the drive shaft via a driver to an annular swivel disk and from this in turn to the pistons, which can be displaced translationally parallel to the machine shaft.
• the swivel plate is pivotally mounted on a sleeve that is attached to the machine shaft so as to be linearly displaceable.
• the driver is designed as a pin which is rotationally symmetrical with respect to its main axis, with a spherical head, a slim neck section and a cylindrical fastening section.
• the object of the invention is to provide a reciprocating piston machine which transmits higher torques and a higher output.
• This object is achieved by a reciprocating piston machine with the features of claims 1, 4 and / or 6.
• the reciprocating piston machine is characterized by a swivel plate for power transmission to the pistons, which is pivotably mounted on a sliding body about a hinge axis oriented transversely to the machine shaft, and a driver which has a linkage section in engagement with the leg plate, its mass and / or Center of space lies outside a main center plane, which runs perpendicular to the hinge axis and through the axis of rotation of the machine shaft.
• Said main center plane lies between the pressure and suction side of the reciprocating piston machine, the pistons performing a compression movement on the pressure side, while the pistons perform a suction movement on the suction side.
• the center of mass or space of the articulation section of the driver outside the main center plane on the pressure side of the reciprocating piston machine. It is particularly advantageous to arrange the articulation section of the driver in such a way that the moments on the swivel disk (in particular on its hinge axis) are minimal during operation. It is advantageous to arrange the center of mass or space of the articulation section approximately in such a way that its vertical projection onto the main center plane results in a point whose distance from the axis of rotation of the machine shaft corresponds to the distances of the piston axes from the axis of rotation of the machine shaft.
• the center of mass and / or space of the articulation section lies at least approximately on a cylinder jacket which contains the piston axes.
• the center of mass and / or space of the articulation section thus run approximately on the cylinder jacket and thus each cross the extension line Piston axis. In this way, there is a favorable mass distribution within the reciprocating piston machine.
• the point of contact between the articulation section and the swivel plate lies at least approximately on the cylinder jacket which contains the piston axes.
• the point of contact between the articulation section and the swivel disk runs approximately on the cylinder jacket and thus crosses the extension line of each piston axis. This results in a favorable power transmission arrangement.
• the driver axis forms an approximately right angle with the axis of rotation of the machine shaft, that is to say the driver protrudes transversely from the machine shaft. This results in a large swivel range in both directions of the machine shaft for the swivel disk, which can be swiveled relative to the driver. Furthermore, a particularly simple assembly of the driver on the machine shaft is made possible.
• the reciprocating piston machine according to the invention is alternatively characterized in that the driver has a fastening section with a non-circular fastening cross section and the machine shaft has a recess for receiving the driver with a corresponding cross section, the longest extension of the non-circular fastening cross section in a through the axis of rotation of the machine shaft and the driver axis spanned plane is arranged.
• a fastening cross section means a section transverse to the driver axis in the area of the fastening section of the driver. This provides a higher moment of inertia in the direction of movement of the pistons and thus increased stability of the driver.
• the fastening cross section preferably has the shape of an arena, an ellipse, or a flattened circle.
• the driver is held in the machine shaft by means of a press and / or transition fit. There is preferably a reduced pressure in the direction of the shortest extension of the
• Fastening cross section and an increased pressure in the direction of the longest extension of the fastening cross section is provided.
• the reciprocating piston machine according to the invention is alternatively characterized in that the driver has a neck section with a non-round shark cross-section, the longest extension of the non-round shark cross-section extending approximately in the direction of a geometric center plane of the movement of the swivel plate.
• the swivel plate can assume a first and a second reversing position (extreme position) with respect to the driver and otherwise moves back and forth between the two reversing positions.
• the center position of the swivel plate between the two reversing positions is defined by the so-called geometric center plane.
• the neck section of the driver must leave space for pivoting the swivel plate relative to the driver.
• the driver should have the highest possible moment of inertia, which can be achieved by the widest possible cross section. Both requirements are advantageously met by a neck section with an at least partially non-circular shark cross section. The driver neck can thus be better adapted to the required extreme positions of the swivel plate.
• a preferably radially oriented receptacle is provided in the swivel disk, into which the driver engages in a pivotable manner, and the dimensions of the shark cross section are adapted to the space released by the receptacle in the reversing positions of the swivel disk.
• the design of the Driver neck corresponds directly to the shape of the receptacle on the swivel plate, with one half of a non-round shark cross section being adapted to the position of the receptacle in the first reversing position of the swivel plate and the other half of the non-round shark cross section being adapted to the position of the receptacle in the second reversing position of the swivel plate.
• the driver is made in one piece with the machine shaft. This results in a reduced load on the machine shaft and a tension and deformation-friendly transition between the driver and the machine shaft.
• FIG. 1 shows a longitudinal section through a reciprocating piston machine according to the invention
• FIG. 2 is a schematic diagram of the function of the reciprocating piston machine according to FIG. 1,
• FIG. 3 shows a section through the machine shaft of the reciprocating piston machine according to FIG. 1 along the line III-III,
• FIG. 5 shows a cross section through the driver according to FIG. 4 along the line V-V
• ⁇ shows a modified cross section corresponding to the cross section according to FIG. 5,
• FIG. 7 shows a detailed illustration of a driver head including neck section in an installation situation with a swivel disk (shown in two extreme positions),
• FIG. 8 shows a cross section through the neck portion of the
• the reciprocating piston machine 1 shows a longitudinal section through a reciprocating piston engine 1 in the form of a refrigerant compressor for a motor vehicle air conditioning system.
• the reciprocating piston machine 1 has a plurality of pistons 4 arranged in a machine housing 3. All piston axes 12 are at a fixed distance from the axis of rotation 11, i.e. geometrically arranged on a cylinder jacket around the machine shaft 2.
• the pistons are guided in cylindrical liners, with all piston axes 12 being aligned parallel to the axis of rotation 11 of the machine shaft.
• the rotational movement of the machine shaft is converted into a translational movement of the pistons 4 by means of a power transmission arrangement which is explained in more detail below.
• 2 shows a simplified schematic diagram for power transmission between the machine shaft 2 and the piston 4.
• a sliding body in the form of a sliding sleeve 9 is guided on the machine shaft.
• An annular swivel disk 5 is in turn mounted on the sliding sleeve 9, the swivel disk 5 being displaceable together with the sliding sleeve 9 parallel to the direction of the axis of rotation 11.
• two short pins 13 are attached, which define a hinge axis 8 oriented transversely to the axis of rotation 11 of the machine shaft, about which the swivel plate 5 can be pivoted.
• a driver 7 is fixed in a recess 2a of the machine shaft 2, a press or transition fit preferably being present between the fastening section 7c of the driver and the recess 2a.
• the machine shaft and driver 7 made in one piece. Since the bending stress of the driver 7 continues into the associated recess in the shaft 2, so that micro-displacements occur in the press joint between the driver and the shaft, the bending stiffness of the driver 7 can be increased and thus a bending can be reduced if the driver and Shaft consist of one piece. It is then also possible to implement transitions which are favorable in terms of stress and deformation.
• the driver 7 protrudes approximately at a right angle from the machine shaft and engages with a spherical articulation section 7a in a radially open receptacle 14 on the part of the swivel plate (see FIGS. 2 and 3). Since the driver 7 is fixed to the machine shaft, the pivoting of the swivel plate about the hinge axis 8 is coupled to the displacement of the sliding sleeve 9. When the reciprocating piston machine is operating, the rotation of the machine shaft 2 is transmitted to the swivel plate via the driver 7 (rotary movement in the direction of the arrow w).
• a main central plane 10 running through the axis of rotation 11 is defined perpendicular to the hinge axis 8 and separates a suction side S from a pressure side D of the reciprocating piston machine (cf. FIG. 3).
• the main center plane 10 rotates with the machine shaft.
• the swivel plate 5 is encompassed on its circumference in the region of each piston 4 by a joint arrangement 6 which slides over the swivel plate when it executes its rotational movement w.
• the swivel plate causes the pistons on the pressure side D to undergo a compression movement and the pistons on the suction side S to perform a suction movement in the course of their rotational movement. Further details on the structure and function of the reciprocating piston machine 2 can be found in DE 197 49 727 AI, to which reference is hereby expressly made.
• the center of mass and / or space of the articulation section 7a is preferably arranged geometrically approximately on the cylinder jacket which contains the piston axes 12.
• the receptacle 14, which surrounds the articulation section 7a preferably has a main axis 16, which includes an angle between 20 ° and 30 ° with the main center plane 10. The corresponding angle then preferably also includes the driver axis 17 with the main center plane 8.
• the contact point P between the articulation section 7a and the swivel plate 5 is preferably arranged approximately on the cylinder jacket which contains the piston axes 12.
• the point of contact P between the articulation section 7a and the swivel plate 5 lies approximately on the cylinder jacket, which contains the piston axes 12, and the center of mass and / or space of the articulation section 7a lies outside the cylinder jacket.
• the fastening cross section corresponds to the section along the line VV in FIG. 4 and is shown separately in FIG. 5.
• the longest extension of the non-circular fastening cross section runs along a line which lies in a plane spanned by the driving axis 17 and the axis of rotation 11.
• the driver 7 protrudes at right angles from the machine shaft 2
• the longest extension of the non-circular fastening cross section is aligned parallel to the axis of rotation 11.
• the non-circular fastening cross section has the shape of an arena (FIG. 5).
• the non-circular is Fastening section designed, for example, as a flattened circle (see FIG. 6), as an ellipse or as a P2 profile.
• the machine shaft 2 has a recess 2a with a corresponding cross section for receiving the driver.
• the recess can be designed as a blind hole or as a breakthrough through the machine shaft.
• the machine shaft and driver are integrally connected to one another.
• the driver is held in the area of the fastening section 7c by means of a press fit in the machine shaft, which has a reduced surface pressure transversely to the orientation of the longest extension of the non-circular fastening cross section and an increased surface pressure in the direction of the longest extension of the non-round fastening cross section.
• the driver 7 engages in a preferably radial receptacle 14 on the part of the swivel plate 5.
• the swivel plate is pivoted between its two reversing or extreme positions 5 ⁇ and 5 ⁇ (see FIGS. 7 and 8), it assumes different orientations with respect to the driver 7, ie the swivel plate 5 oscillates with respect to the articulation section 7a by a so-called geometric one Middle plane 18, which runs through the hinge axis 8.
• the swivel plate 5 is aligned exactly transversely to the machine shaft 2, with the transversely projecting driver 7, the swivel plate and driver are aligned parallel.
• the swivel plate In the reversing position 5 ⁇ , the swivel plate assumes a maximum angle with respect to the driver.
• the receptacle 14 of the swivel plate is oriented differently from the driver 7 and therefore frees up space in different orientations.
• the cross section of a driving neck 7b is adapted to the space released by the receptacle 14 in the reversing positions 5 ⁇ or 5 , ⁇ , which results in a non-circular, in particular sectionally lemon-shaped cross section results.
• the longest extension of the non-circular cross section of the driving neck 7b extends at least approximately in the geometric center plane 18.
• the surface of the driver 7 on the neck portion 7b is preferably composed of two incomplete cylinder surfaces, the diameter of which is the same and is a certain amount smaller than the diameter of the cylindrical receptacle 14.
• the geometric central axes 19 x and 19 x ⁇ generally coincide with the The central axis 16 of the receptacle 14 in the respective reversing position and preferably intersect in the region of the center of mass or space of the articulation section 7a. This results in the greatest possible moment of inertia and the least possible deflection of the driving neck 7b.
• the receptacle 14 is inward, i. H. designed conically expanded towards the machine shaft.
• the surface of the driving neck 7b is composed of two incomplete conical surfaces. There is also a lemon-shaped cross section.
• a further embodiment of a driver 7 according to the invention is shown, among other things.
• a discontinuous, i.e. Edged surface of the driving neck 7b is provided.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
• Compressor (AREA)
• Reciprocating Pumps (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7685133

Family Applications (1)

Country Status (8)

Families Citing this family (10)

Family Cites Families (12)

• 2001
  • 2001-05-16 DE DE10124031A patent/DE10124031B4/de not_active Expired - Fee Related
• 2002
  • 2002-03-14 CN CN02809899A patent/CN100575702C/zh not_active Expired - Fee Related
  • 2002-03-14 AU AU2002310948A patent/AU2002310948A1/en not_active Abandoned
  • 2002-03-14 EP EP02735132A patent/EP1387956A2/de not_active Withdrawn
  • 2002-03-14 KR KR1020037014930A patent/KR100871261B1/ko not_active IP Right Cessation
  • 2002-03-14 JP JP2002590248A patent/JP4053432B2/ja not_active Expired - Fee Related
  • 2002-03-14 WO PCT/EP2002/002829 patent/WO2002093009A2/de active Application Filing
• 2003
  • 2003-11-14 US US10/713,781 patent/US7144227B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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