EP0947696A1 - Compresseur à plateau de commande oblique avec accomodation facile et rapide de pression en boíte de manivelle - Google Patents

Compresseur à plateau de commande oblique avec accomodation facile et rapide de pression en boíte de manivelle Download PDF

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Publication number
EP0947696A1
EP0947696A1 EP99106701A EP99106701A EP0947696A1 EP 0947696 A1 EP0947696 A1 EP 0947696A1 EP 99106701 A EP99106701 A EP 99106701A EP 99106701 A EP99106701 A EP 99106701A EP 0947696 A1 EP0947696 A1 EP 0947696A1
Authority
EP
European Patent Office
Prior art keywords
swash plate
drive shaft
crank chamber
cylinder block
plate compressor
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Withdrawn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
EP99106701A
Other languages
German (de)
English (en)
Inventor
Yutaka c/o Sanden Corporation Hasegawa
Shigemi C/O Sanden Corporation Shimizu
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.)
Sanden Corp
Original Assignee
Sanden 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 Sanden Corp filed Critical Sanden Corp
Publication of EP0947696A1 publication Critical patent/EP0947696A1/fr
Withdrawn legal-status Critical Current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
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • 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
    • F04B27/1063—Actuating-element bearing means or driving-axis bearing 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
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F04B2027/1809—Controlled pressure
    • F04B2027/1813—Crankcase pressure
    • 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
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F04B2027/1822—Valve-controlled fluid connection
    • F04B2027/1831—Valve-controlled fluid connection between crankcase and suction chamber
    • 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
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F04B2027/184—Valve controlling parameter
    • F04B2027/1854—External parameters

Definitions

  • the present invention relates to a swash plate compressor which is used in, for example, an air conditioner for a vehicle, an automobile, or general use.
  • a conventional swash plate compressor comprises a compressor casing defining a crank chamber and including a cylinder block defining a cylinder bore.
  • a drive shaft is rotatably supported by the compressor casing via bearings and driven by, for example, an engine of the automobile.
  • the drive shaft has an end portion rotatably supported by the cylinder block.
  • a swash plate is mounted on the drive shaft in the crank chamber and has rotation caused by the drive shaft.
  • a piston is reciprocated in the cylinder bore to cause compression of a gaseous fluid such as a refrigerant gas.
  • such a swash plate compressor may be divided into a variable displacement type and a fixed displacement type.
  • the swash plate has an angle controlled under pressure in the crank chamber. In accordance with the angle of the swash plate, displacement of the swash plate compressor is determined. Therefore, it is necessary to control pressure in the crank chamber.
  • the conventional swash plate compressor of the variable displacement type further comprises a pressure control arrangement which comprises a clearance portion left between the end portion of the drive shaft and the cylinder block and a path portion communicating the crank chamber with the clearance portion.
  • the pressure control arrangement is insufficient for rapidly controlling the pressure in the crank chamber. This is because it is difficult to widely make the path portion in the manner known in the art.
  • the path portion may be prevented by a mechanism which is for supporting the drive shaft. This results in deterioration of responsibility at a time when the displacement of the swash plate compressor is changed.
  • a swash plate compressor which comprises a compressor casing defining a crank chamber and including a cylinder block defining a cylinder bore, a drive shaft having an end portion rotatably supported by the cylinder block, a swash plate placed in the crank chamber and having rotation caused by the drive shaft, a piston inserted in the cylinder bore and reciprocated in accordance with the rotation of the swash plate, and pressure control means for controlling pressure in the crank chamber.
  • the pressure control means comprises a clearance portion left between the end portion of the drive shaft and the cylinder block and a path portion communicating the crank chamber with the clearance portion.
  • the pressure control means further comprises at least one groove portion made to the cylinder block to widen the path portion.
  • the swash plate compressor is of a variable displacement type and comprises a cylinder block 11 having a plurality of cylinder bores 12 each extending in a predetermined direction, a cylinder head 13 fixed to an end of the cylinder block 11 in the predetermined direction through a valve plate 14, and a front housing 15 fixed to the other end of the cylinder block 11 in the predetermined direction.
  • a combination of the cylinder block 11 and the front housing 15 is referred to as a compressor casing and defines a crank chamber 16.
  • a drive shaft 17 is rotatably supported by the cylinder block 11 and the front housing 15 via a rear radial bearing 18 and two front radial bearings 19 and 21.
  • the drive shaft 17 is driven by, for example, an engine of an automobile. It is to be noted that the drive shaft 17 has a rear end portion 17a rotatably supported by the cylinder block 11 via the rear radial bearing 18.
  • a rotor 22 is fixed to the drive shaft 17 by a pin member 23 in the crank chamber 16.
  • a thrust bearing 24 is interposed between the rotor 22 and the front housing 15.
  • a swash plate 25 is placed in the crank chamber 16 and coupled to the rotor 22 through a plate boss 26 and a hinge mechanism 27.
  • the hinge mechanism 27 makes the swash plate 25 have an angle which is variable in the manner known in the art. It is a matter of course that the swash plate 25 is rotated together with the drive shaft 17 and the rotor 22.
  • a plurality of pistons 28 are slidably inserted in the cylinder bores 12, respectively.
  • Each of the pistons 28 is engaged with a peripheral portion of the swash plate 25 via shoes 29 in the predetermined direction.
  • a plurality of pistons 28 are driven via the shoes 29 in the cylinder bores 12, respectively.
  • each of the pistons 28 is reciprocated to cause compression of a gaseous fluid such as a refrigerant gas.
  • the gaseous fluid is displaced from a suction chamber 31 to a discharge chamber 32 through the cylinder bores 12 in response to reciprocation of each of the pistons 28.
  • the cylinder block 11 has a center bore 33 penetrating in the predetermined direction at a central portion thereof.
  • a flow control valve 34 is placed in a rear portion of the center bore 33 and is for controlling a flow of the gaseous fluid between the crank chamber 16 and the suction chamber 31 in the manner known in the art.
  • the rear end portion 17a of the drive shaft 17 is rotatably supported by the rear radial bearing 18.
  • the rear end portion 17a and the rear radial bearing 18 define a clearance portion therebetween.
  • the drive shaft 17 has a rear end surface received by a rear thrust bearing 35 placed in a middle portion of the center bore 33. It is a matter of course that the rear thrust bearing 35 has a communication space which communicates the clearance portion with the flow control valve 34.
  • a middle thrust bearing 36 is placed around the drive shaft 17.
  • the middle thrust bearing 36 is engaged between the drive shaft 17 and an axial receiving surface 37 in the front portion of the central bore 33 to prevent the drive shaft 17 from being moved towards the flow control valve 34.
  • the middle thrust bearing 36 comprises a rear race 36a, a front race 36b, and rolling elements 36c between the rear and the front races 36a and 36b.
  • the rear race 36a is in contact with the axial receiving surface 37.
  • a spring 38 like a belleville spring is interposed between the front race 36b and a stopper ring 39 fixed to the drive shaft 17. It is to be noted that a circular gap 41 is left between the middle thrust bearing 36 and a cylindrical surface of the center bore 33.
  • grooves 42 are formed at the axial receiving surface 37 of the cylinder block 11.
  • the grooves 42 extend in a radial direction to make an angle of 45° with one another.
  • a combination of the grooves 42 and the circular gap 41 is referred to as a path portion which communicates the crank chamber with the above-mentioned clearance portion. It is to be noted that the grooves 42 widen the path portion.
  • slits or grooves 43 are formed at a rear surface of the rear race 36a of the middle thrust bearing 36 in one-to-one correspondence of the grooves 42.
  • the slits 43 further widen the path portion in cooperation with the grooves 42. Therefore, the flow of the gaseous fluid with a less loss can be established. In other words, the gaseous fluid flows from the crank chamber 16 to the flow control valve 34 through the path portion, the clearance portion, and the above-mentioned communication space, thereby reducing the pressure in the crank chamber 16.
  • the angle of the swash plate 25 varies in response to a change of the pressure in the crank chamber 16.
  • Each of the pistons 28 has a stroke determined in accordance with the angle of the swash plate 25. Therefore, the swash plate compressor has a displacement which is variable in response to the pressure in the crank chamber 16.
  • the swash plate compressor is of a fixed displacement type and comprises similar parts designated by like reference numerals.
  • the swash plate 25 is fixed to the drive shaft 17 by a pin member 51 to have an angle fixed relative to the drive shaft 17.
  • the center bore 33 of the cylinder block 11 is not provided with the flow control valve 34 and the rear thrust bearing 35 that are illustrated in Fig. 1.
  • the rear end portion 17a of the drive shaft 17 is rotatably supported to the cylinder block 11 via a radial bearing 52.
  • the rear end portion 17a and the radial bearing 52 define the clearance portion therebetween.
  • the thrust bearing 36 is engaged between the drive shaft 17 and an axial receiving surface 54 of the cylinder block 11 to prevent the drive shaft 17 from being moved towards the discharge chamber 32.
  • At least one groove or notch 55 is formed at the axial receiving surface 54 of the cylinder block 11.
  • the groove 55 extends in a radial direction.
  • the groove 55 is referred to as the path portion. It is to be noted that the groove 55 widens the path portion.
  • an additional path portion 56 is made in the cylinder block 11.
  • the additional path portion 56 is connected to the center bore 33 and the suction chamber 31. Therefore, the gaseous fluid flows from the crank chamber 16 towards the suction chamber 31 through the path portion, the clearance portion, the center bore 33, and the additional path portion. In this event, the flow of the gaseous fluid with a less loss can be established. Since the gaseous fluid flows with lubricating oil through the radial bearing 52, the lubrication operation is favorably made. This results in increasing the durability of the radial bearing 52.
  • the grooves 42 may be made to the rear race 36a of the middle thrust bearing 36 in place of the axial receiving surface 37 of the cylinder block 11.
  • the grooves 42 may be made to both of the rear race 36a and the axial receiving surface 37.
  • a single groove may be used in place of the grooves 42.
  • a plurality of grooves may be used in place of the groove or notch 55.
EP99106701A 1998-04-03 1999-04-01 Compresseur à plateau de commande oblique avec accomodation facile et rapide de pression en boíte de manivelle Withdrawn EP0947696A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10091564A JPH11294326A (ja) 1998-04-03 1998-04-03 斜板式圧縮機
JP9156498 1998-04-03

Publications (1)

Publication Number Publication Date
EP0947696A1 true EP0947696A1 (fr) 1999-10-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99106701A Withdrawn EP0947696A1 (fr) 1998-04-03 1999-04-01 Compresseur à plateau de commande oblique avec accomodation facile et rapide de pression en boíte de manivelle

Country Status (2)

Country Link
EP (1) EP0947696A1 (fr)
JP (1) JPH11294326A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003029654A1 (fr) * 2001-09-28 2003-04-10 Zexel Valeo Climate Control Corporation Compresseur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4642574B2 (ja) * 2005-07-07 2011-03-02 サンデン株式会社 往復動圧縮機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687419A (en) * 1984-12-28 1987-08-18 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Variable angle wobble plate type compressor which maintains the crankcase pressure at a predetermined value
EP0256334A1 (fr) * 1986-07-21 1988-02-24 Sanden Corporation Compresseur à plateau disposé en biais avec mécanisme à déplacement variable
US5094590A (en) * 1990-10-09 1992-03-10 General Motors Corporation Variable displacement compressor with shaft end play compensation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687419A (en) * 1984-12-28 1987-08-18 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Variable angle wobble plate type compressor which maintains the crankcase pressure at a predetermined value
EP0256334A1 (fr) * 1986-07-21 1988-02-24 Sanden Corporation Compresseur à plateau disposé en biais avec mécanisme à déplacement variable
US5094590A (en) * 1990-10-09 1992-03-10 General Motors Corporation Variable displacement compressor with shaft end play compensation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003029654A1 (fr) * 2001-09-28 2003-04-10 Zexel Valeo Climate Control Corporation Compresseur

Also Published As

Publication number Publication date
JPH11294326A (ja) 1999-10-26

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