EP1273799A1 - Kolbenführung für einen Taumelscheibenverdichter - Google Patents

Kolbenführung für einen Taumelscheibenverdichter Download PDF

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Publication number
EP1273799A1
EP1273799A1 EP01115506A EP01115506A EP1273799A1 EP 1273799 A1 EP1273799 A1 EP 1273799A1 EP 01115506 A EP01115506 A EP 01115506A EP 01115506 A EP01115506 A EP 01115506A EP 1273799 A1 EP1273799 A1 EP 1273799A1
Authority
EP
European Patent Office
Prior art keywords
piston
guide means
plate
cylinder
foot portion
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.)
Withdrawn
Application number
EP01115506A
Other languages
English (en)
French (fr)
Inventor
Ullrich Dr. Hesse
Thomas Dr. Tiedemann
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.)
Valeo Thermal Systems Japan Corp
Original Assignee
Zexel Valeo Climate Control Corp
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 Zexel Valeo Climate Control Corp filed Critical Zexel Valeo Climate Control Corp
Priority to EP01115506A priority Critical patent/EP1273799A1/de
Publication of EP1273799A1 publication Critical patent/EP1273799A1/de
Withdrawn legal-status Critical Current

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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
    • F04B27/10—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

Definitions

  • the present invention relates to a piston guide means for use in a swash or wobble plate compressor, in particular a CO 2 compressor, for a vehicle air-conditioning system and to a compressor incorporating such a guide means.
  • Compressors are often constructed as reciprocating piston compressors, in particular in the field of vehicle air-conditioning systems, because such compressors are compact and their output can be continuously controlled by adjustment of the angle of a swash or wobble plate arrangement which is used to drive the pistons.
  • Compressors employing a swash or wobble plate arrangement do not need a connecting rod, the driving force for each piston being transmitted from the swash or wobble plate arrangement to the piston by bearings comprising sliding shoes or blocks.
  • a conventional swash plate compressor comprises a piston 1 with a piston head 2 at one end which reciprocates in a cylinder 3.
  • the end 4 of the piston 1 opposite the piston head 2 extends out of the cylinder 3 and is provided with a recess 5 in which is mounted a pair of sliding shoes 6.
  • the forces transmitted to the piston 1 are not exclusively axial forces but comprise a substantial radial component F 1 , which is dependent on the angle of inclination of the plate arrangement 7.
  • the radial component F 1 results in forces of reaction F 2 and F 3 , of which F 2 is the greater and acts at the edge 9 of the cylinder 3, as shown in the enlarged scrap view in Fig. 3.
  • radiussing of the edge 9 as at R line contact between the piston 2 and the edge 9 occurs with a consequent substantial compression of the piston 1 that increases wear.
  • the object of the present invention is to provide a piston guide means for use in a swash plate compressor which overcomes or substantially mitigates the aforementioned disadvantages.
  • a piston guide means for use in a swash or wobble plate compressor comprising a piston with a piston head at one end and a foot portion at its other end, which foot portion accommodates a bearing for a swash or wobble plate arrangement of the compressor, and a cylinder in which the piston head can be reciprocated, and characterised in that the piston comprises a piston rod that extends out of the cylinder between the piston head and the foot portion through a plate or similar arrangement.
  • the plate covers the end of the cylinder.
  • the piston rod passes through a bush which is mounted in the plate.
  • the outer surface of the bush defines a domed or hemispherical profile so that it is capable of rotation with respect to the plate.
  • the bush is resiliently mounted in the plate, preferably by being embedded in a resilient material or by being spring mounted in the plate.
  • the piston rod defines a non-spherical transverse cross-sectional profile so that it cannot rotate with respect to the plate.
  • the piston rod is eccentrically mounted to the piston head so that the piston cannot rotate with respect to the plate.
  • the piston rod comprises a hollow tube which is swaged to the piston head and to the foot portion.
  • the piston rod may be made of steel, preferably the piston head and the foot portion are made of aluminium.
  • the plate defines at least one bore to provide for gas and/or oil balancing within the cylinder as the piston head reciprocates therein.
  • a gap is provided between the plate and the end of the cylinder.
  • a swash or wobble plate compressor comprising a piston guide means according to the first aspect of the present invention.
  • a compressor for a vehicle air conditioning system comprising a drive shaft, a swash or wobble plate arrangement operatively connected to the drive shaft, a piston with a piston head at one end and a foot portion at its other end, a cylinder in which the piston head can be reciprocated, and a bearing accommodated in the foot portion that cooperates with the swash or wobble plate arrangement to reciprocate the piston as the drive shaft rotates, and characterised in that the piston comprises a piston rod that extends out of the cylinder between the piston head and the foot portion through a plate or similar arrangement.
  • a piston 10 comprises a piston rod 11 with a head portion 12 comprising piston rings 13 at one end, and a foot portion 14 at its other end.
  • the foot portion 14 defines a recess 15 which accommodates a bearing 16 for a swash or wobble plate arrangement 17 that is connected to a drive shaft (not shown) of the compressor for driving the piston 10 with a reciprocating motion.
  • the piston rod 11 may be made of a solid material, such as steel, the size of the rod being such that making it of a solid material does not increase the overall weight of the piston 11 excessively.
  • the rod 11 comprises a hollow tube and is connected to the head portion 12 and to the foot portion 14 by swaging or other method.
  • the head portion 12 of piston 10 reciprocates within a cylinder 18 of the compressor, the piston rod 11 extending out of the cylinder 18 through a bush 19 that is mounted in a plate 20 which covers the end of the cylinder 18. Bores 21 are provided in the plate 20 adjacent the bush 19 to provide for gas and oil balancing within the cylinder 18 as the piston head 12 reciprocates.
  • the plate 20 may be mounted some distance from the end of the cylinder 18 to provide a gap for gas and oil balancing.
  • the rod 11 reciprocates within the central bore of the bush 19.
  • the outer surface of the bush 19 preferably defines a domed or hemispherical profile, as shown in Fig. 3, so that it is capable of rotation with respect to the plate 20.
  • the force F 2 as described above, thereby acts over the internal surface of the bush 19 against the rod 11.
  • the combination of the piston rod 11 with the arrangement of the plate 20 and bush 19 enables the F 2 force component to be spread over a larger area than in the prior art, which thereby reduces compression of the rod 11 as a result. Wear of the piston rod 11 is thereby mitigated.
  • the piston rod 11 may be made from steel
  • the piston head 12 and the foot portion 14 can be made of a more lightweight material such as aluminium.
  • the bush 19 is not necessarily domed but is able to twist or rotate slightly by being resiliently mounted in the plate 20, for example by being embedded in a resilient material such as an elastomer or by being spring mounted, for example by being suspended on a metal spring which allows some tipping movement.
  • the piston rod 11 has a non-spherical transverse cross-sectional profile, for example it may have an elliptical transverse profile, so that it cannot rotate within the bush 19.
  • This has the significant advantage that the piston 10 is also prevented from rotating within the cylinder 18 without other more expensive means having to be provided for the same purpose. Such means have the disadvantage that they usually result in additional frictional losses within the compressor.
  • a similar result can be achieved by an eccentric mounting of the piston rod 11 to the piston head 12.
  • the present invention has the advantage that it does not require any labor-intensive machining operations to be carried out on the piston 10, nor coating of the piston 10 with wear resistant material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP01115506A 2001-06-27 2001-06-27 Kolbenführung für einen Taumelscheibenverdichter Withdrawn EP1273799A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01115506A EP1273799A1 (de) 2001-06-27 2001-06-27 Kolbenführung für einen Taumelscheibenverdichter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01115506A EP1273799A1 (de) 2001-06-27 2001-06-27 Kolbenführung für einen Taumelscheibenverdichter

Publications (1)

Publication Number Publication Date
EP1273799A1 true EP1273799A1 (de) 2003-01-08

Family

ID=8177840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01115506A Withdrawn EP1273799A1 (de) 2001-06-27 2001-06-27 Kolbenführung für einen Taumelscheibenverdichter

Country Status (1)

Country Link
EP (1) EP1273799A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006066830A1 (de) * 2004-12-20 2006-06-29 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Trockenlaufender verdichter, insbesondere taumelscheibenverdichter, mit einer kolbenstangenlagerung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746475A (en) * 1971-02-03 1973-07-17 Gen Motors Corp Double-acting swashplate compressor
US3817660A (en) * 1971-06-25 1974-06-18 Ford Motor Co Air conditioner compressor
US4090430A (en) * 1974-10-09 1978-05-23 The Japan Steel Works Swash plate type compressor
US4495855A (en) * 1983-05-31 1985-01-29 Showa Precision Machinery Co., Ltd. Reciprocating type oil-free gas compressor
US5549032A (en) * 1995-04-25 1996-08-27 Long; Otto V. Low-pollution high-power external combustion engine
EP0748936A1 (de) * 1995-06-05 1996-12-18 Calsonic Corporation Schiefscheibenverdichter mit veränderlicher Verdrängung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746475A (en) * 1971-02-03 1973-07-17 Gen Motors Corp Double-acting swashplate compressor
US3817660A (en) * 1971-06-25 1974-06-18 Ford Motor Co Air conditioner compressor
US4090430A (en) * 1974-10-09 1978-05-23 The Japan Steel Works Swash plate type compressor
US4495855A (en) * 1983-05-31 1985-01-29 Showa Precision Machinery Co., Ltd. Reciprocating type oil-free gas compressor
US5549032A (en) * 1995-04-25 1996-08-27 Long; Otto V. Low-pollution high-power external combustion engine
EP0748936A1 (de) * 1995-06-05 1996-12-18 Calsonic Corporation Schiefscheibenverdichter mit veränderlicher Verdrängung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006066830A1 (de) * 2004-12-20 2006-06-29 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Trockenlaufender verdichter, insbesondere taumelscheibenverdichter, mit einer kolbenstangenlagerung

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