US20180051682A1 - Wobble Plate Type Variable Displacement Compressor - Google Patents
Wobble Plate Type Variable Displacement Compressor Download PDFInfo
- Publication number
- US20180051682A1 US20180051682A1 US15/561,141 US201615561141A US2018051682A1 US 20180051682 A1 US20180051682 A1 US 20180051682A1 US 201615561141 A US201615561141 A US 201615561141A US 2018051682 A1 US2018051682 A1 US 2018051682A1
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- United States
- Prior art keywords
- main shaft
- wobble plate
- rotating main
- support portion
- variable displacement
- 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.)
- Abandoned
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Classifications
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- 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
-
- 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
- F04B27/12—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 having plural sets of cylinders or pistons
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- 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
- F04B27/0895—Component parts, e.g. sealings; Manufacturing or assembly thereof driving means
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- 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
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- 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
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- 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
Definitions
- the present invention relates to a wobble plate type variable displacement compressor in which a piston is reciprocated by a wobble plate which swings along with the rotation of a rotating main shaft, and specifically, relates to a wobble plate type variable displacement compressor used in a refrigerant circulating device for a vehicle air conditioning system, and the like.
- a compressor disclosed in Patent Document 1 As this type of wobble plate type variable displacement compressor, a compressor disclosed in Patent Document 1 has been proposed.
- a piston support is swung along with rotation of a swash plate synchronously rotating with a main shaft of which a front end side and a rear end side are rotatably supported by a housing via bearings, to thereby reciprocate the piston in a cylinder bore.
- a rotation preventing mechanism of the piston support on a middle portion of the main shaft, and devising a structure of the rotation preventing mechanism, the whirling vibration of the main shaft occurring when the compressor is driven and noise occurring therefrom are reduced.
- Patent Document 1 JP H05-99137 A
- the main shaft is supported on the inner peripheral surface of the support sleeve via the swash plate sleeve, and the support sleeve is supported in the guide hole of the cylinder block.
- the supporting portion of the support sleeve which supports the main shaft and the supported portion of the support sleeve which is supported in the guide hole of the cylinder block do not overlap in the axial direction of the main shaft, with respect to the whirling vibration of the main shaft occurring when the compressor is driven, the support sleeve is supported by a cantilever structure, and thus, the effect of reducing the whirling vibration of the main shaft is insufficient.
- the present invention has been made by focusing on the abovementioned problem, and it is an object of the invention to provide a wobble plate type variable displacement compressor which is able to sufficiently reduce the whirling vibration of the rotating main shaft by modifying the mounting structure of the rotation preventing mechanism.
- a wobble plate type variable displacement compressor of the present invention includes: a rotating main shaft of which a front end side and a rear end side are rotatably supported by a housing; a swash plate which synchronously rotates with the rotating main shaft and is inclinable with respect to the rotating main shaft; a wobble plate which swings along with the rotation of the swash plate with respect to the rotating main shaft to thereby reciprocate a piston in a cylinder bore; a wobble plate rotation preventing mechanism disposed at a middle portion of the rotating main shaft and prevents the wobble plate from rotating at the time of rotating the rotating main shaft.
- the wobble plate rotation preventing mechanism includes: a guide member which has a first support portion of which an outer peripheral surface is supported on an inner peripheral surface of a guide hole in the housing to be movable in an axial direction of the rotating main shaft and prevented from rotating around the rotating main shaft; and a connecting mechanism which connects the wobble plate to the guide member so that the wobble plate is swingable with respect to the guide member and rotation preventing force of the guide member is transmitted.
- the guide member further includes a second support portion of which an inner peripheral surface supports the rotating main shaft. The first support portion and the second support portion are arranged to overlap in the axial direction of the rotating main shaft.
- the wobble plate type variable displacement compressor of the present invention it is possible to reduce the whirling vibration of the main shaft occurring when the compressor is driven.
- FIG. 1 is a sectional view illustrating a configuration example of a wobble plate type variable displacement compressor according to an embodiment of the present invention.
- FIG. 2 is a sectional view illustrating the wobble plate type variable displacement compressor of FIG. 1 in another operating state.
- FIG. 3 is an exploded perspective view illustrating a main part including a wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor of FIG. 1 .
- FIGS. 4A and 4B are a view illustrating an example of the wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor of FIG. 1 , FIG. 4A being a partial sectional view and FIG. 4B being a partial front view.
- FIGS. 1 to 4A and 4B A configuration example of an embodiment of a wobble plate type variable displacement compressor according to the present invention will be described with reference to FIGS. 1 to 4A and 4B .
- FIG. 1 is a configuration example of a wobble plate type variable displacement compressor according to the present embodiment, and shows the operating state when the discharge displacement is maximum and when the inclination angle of a swash plate is maximum.
- FIG. 2 shows the operating state of the wobble plate type variable displacement compressor of FIG. 1 when the discharge displacement is minimum and when the inclination angle of the swash plate is minimum.
- FIG. 3 is an exploded perspective view illustrating a main part including the wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor of FIG. 1 .
- FIGS. 4A and 4B show an example of a wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor of FIG. 1 .
- the inclination angle of the swash plate which synchronously rotates with the rotating main shaft is varied with respect to the rotational main shaft, to change the wobble width of the wobble plate which swings along with rotation of the swash plate with respect to the rotational main shaft, to control a stroke amount of a piston, so that a refrigerant discharge displacement from a cylinder bore is varied.
- a housing is made up of a cylinder block 2 disposed at a middle portion, a front housing 3 disposed on a front side of the cylinder block 2 , and a rear housing 4 disposed on a rear side of the cylinder block 2 .
- a rotating main shaft 5 to which a rotational driving force is input from outside is provided to penetrate from the front housing 3 to a portion of the cylinder block 2 .
- the front end portion of the rotating main shaft 5 is rotatably supported on the front housing 3 via a bearing 33 (radial bearing), and a rear end portion of the rotating main shaft 5 is rotatably supported on a fixed wall inside the cylinder block 2 via a bearing 22 (thrust bearing).
- a rotor 6 is fixed to be rotatable integrally therewith, and a thrust bearing 32 is interposed between the rotor 6 and the front housing 3 .
- a swash plate 8 is connected via a hinge mechanism 7 so as to be inclined with respect to the rotating main shaft 5 and synchronously rotatable with the rotating main shaft 5 .
- a piston 10 is inserted into each cylinder bore 9 arranged in an inner peripheral edge portion of the cylinder block 2 so as to be reciprocated, and the piston 10 is connected to a wobble plate 12 via a connecting rod 11 .
- a thrust bearing 31 is interposed between the wobble plate 12 and the swash plate 8 .
- the wobble plate 12 swings along with rotation of the swash plate 8 to reciprocate the piston 10 via the connecting rod 11 .
- a fluid for example, refrigerant gas
- a fluid to be compressed is drawn from a suction chamber 13 formed in an inner peripheral edge portion of the rear housing 4 into the cylinder bore 9 through a suction hole 15 (a suction valve is not shown in the drawing) formed in a valve plate 14 , and the drawn fluid is compressed.
- the compressed fluid is discharged into a discharge chamber 17 formed in an inner central portion of the rear housing 4 through a discharge hole 16 (discharge valve not shown in the drawing), and thereafter, the discharged fluid is sent to an external circuit.
- the wobble plate 12 swings in a state in which a wobble plate rotation preventing mechanism 21 disposed at a middle portion of the rotating main shaft 5 , prevents the wobble plate 12 from rotating.
- a wobble plate rotation preventing mechanism 21 disposed at a middle portion of the rotating main shaft 5 .
- the wobble plate rotation preventing mechanism 21 is movable in an axial direction of the rotating main shaft 5 , and an inner ring rotation preventing mechanism described later prevents the wobble plate rotation preventing mechanism 21 from rotating around the rotating main shaft 5 .
- the wobble plate rotation preventing mechanism 21 includes an inner ring 27 as a guide member and a connecting mechanism which connects the wobble plate 12 to the inner ring 27 .
- the inner ring 27 has a first support portion 52 of which an outer peripheral surface is supported by an inner peripheral surface of a guide hole 2 A of the cylinder block 2 so as to be movable in the axial direction of the rotating main shaft 5 and prevented from rotating therearound, and a second support portion 53 of which an inner peripheral surface supports the rotating main shaft 5 via a plain bearing 51 mounted on the inner peripheral surface.
- the connecting mechanism is configured as a so-called constant velocity universal joint.
- the connecting mechanism includes a plurality of guide grooves 26 formed on the inner ring 27 for guiding balls provided for power transmission, an outer ring 30 which has a plurality of guide grooves 28 for guiding the balls at positions facing the respective guide grooves 26 of the inner ring 27 and which functions as a supporting member which fixedly supports the wobble plate 12 on an outer peripheral portion of the outer ring 30 and rotatably supports the swash plate 8 on an outer peripheral portion of the outer ring 30 via a bearing 29 (radial bearing), a plurality of balls 25 held by the guide grooves 26 , 28 facing each other and formed in the inner ring 27 and the outer ring 30 , respectively, and performing power transmission by being compressed between the guide grooves 26 , 28 , and a sleeve 24 which supports the rotating main shaft 5 via a bearing 23 (radial bearing) and is provided so as to be rotatable relative to the rotating main shaft 5 and be movable in the axial direction thereof, the sleeve 24 swingably supporting the outer ring 30 and
- the outer ring 30 is swingable about the sleeve 24 relative to the inner ring 27 through spherical surface contact between the balls 25 and the guide grooves 26 , 28 facing each other. Furthermore, a rotation preventing force from the side of the inner ring 27 is transmitted to the side of the outer ring 30 through the spherical surface contact between the balls 25 and the guide grooves 26 , 28 .
- the abovementioned inner ring rotation preventing mechanism is configured by an abutting structure in which the guide hole 2 A of the cylinder block 2 is abutted against the outer peripheral surface of the inner ring 27 when the rotating main shaft 5 rotates.
- the outer peripheral surface of the inner ring 27 has three peripheral surfaces formed in a substantially triangular shape of which each angle formed by adjacent peripheral surfaces is 60 degrees.
- the guide hole 2 A of the cylinder block 2 is also has three peripheral surfaces formed in a substantially triangular shape of which each angle formed by adjacent peripheral surfaces is 60 degrees so as to correspond to the outer peripheral surface of the inner ring 27 .
- each edge portion of peripheral surfaces of the inner ring 27 is abutted against each peripheral surface of the guide hole 2 A of the cylinder block 2 to prevent the inner ring 27 from rotating.
- the inner ring rotation preventing mechanism in the wobble plate rotation preventing mechanism 21 of the present embodiment is not limited to the abovementioned abutting structure, but may be a general rotation restricting mechanism such as a key or a spline.
- FIGS. 4A and 4B show a state in which the relative angle between the inner and outer rings 27 , 30 is zero in the wobble plate rotation preventing mechanism 21 .
- the guide grooves 26 , 28 formed on the inner ring 27 and the outer ring 30 of the wobble plate rotation preventing mechanism 21 are disposed to be inclined at relative angles (relative angles within a range of 30 to 60 degrees) relative to the center axis of the rotating main shaft 5 .
- the ball 25 is regulated and supported on the intersection of the axis 42 of the guide groove 26 and the axis 43 of the guide groove 28 . Furthermore, as shown in FIG.
- a structure can be employed in which two ball guides adjacent to each other among a plurality of the ball guides 41 of the wobble plate rotation preventing mechanism 21 are referred to be a pair of ball guides, and the respective ball guides 41 in the pair of ball guides 45 , in other words, axes 46 of the guide grooves formed on the inner and outer rings in this portion, are disposed in parallel to each other.
- the play in the rotational direction in the wobble plate rotation preventing mechanism portion is schematically decided by a relation between the distance between the bottoms of the pair of guide grooves provided on the inner and outer rings 27 , 30 and the diameter of the balls, setting and management of a clearance are facilitated to thereby suppress the play so that the play is small by setting a proper clearance.
- the plurality of balls 25 are supported in the compression direction between the guide grooves 26 , 28 facing each other through the respective balls, and perform power transmission.
- the load applied to the ball 25 which is provided as a moment about the rotating main shaft 5 , is generated as a normal reaction of an actual contact surface.
- the inner ring 27 including the first support portion 52 of which the outer peripheral surface is supported by the inner peripheral surface of the guide hole 2 A of the cylinder block 2 , further includes the second support portion 53 of which the inner peripheral surface supports the rotating main shaft 5 .
- the first support portion 52 and the second support portion 53 of the inner ring 27 are arranged to overlap in the axial direction of the rotating main shaft 5 , and the wobble plate rotation preventing mechanism 21 has a function of reducing the whirling vibration of the rotating main shaft 5 .
- the first support portion 52 and the second support portion 53 are arranged to overlap in the axial direction of the rotating main shaft 5 .
- the first support portion 52 and the second support portion 53 may overlap at least at the minimum inclination angle of the swash plate 8 and may not overlap when the swash plate 8 has the maximum inclination angle, for example.
- the wobble plate type variable displacement compressor 1 since the first support portion 52 and the second support portion 53 are arranged to overlap in the axial direction of the rotating main shaft 5 , a supporting structure of the middle portion of the rotating main shaft 5 is not a cantilever structure as in the prior art. Thus, it is possible to effectively reduce the whirling vibration of the rotating main shaft 5 occurring when the compressor is driven. Therefore, the rotating main shaft 5 is smoothly rotated, to improve contact state of each part of the wobble plate rotation preventing mechanism 21 and reduce abnormal wear of the wobble plate rotation preventing mechanism 21 and the like. As a result, it is possible to improve durability of the wobble plate type variable displacement compressor 1 . Furthermore, in the present embodiment, the rotating main shaft 5 is also supported by the sleeve 24 , and thus, it is possible to further effectively reduce the whirling vibration of the rotating main shaft 5 to improve the durability of the wobble plate type variable displacement compressor 1 .
- the rotation speed to be transmitted does not vary even when the inclination angle changes; however, the present invention is not limited to this.
- the rotation speed to be transmitted can be varied when the inclination angle changes.
- the bearing 23 is interposed between the sleeve 24 and the rotating main shaft 5 ; however, the bearing 23 may be omitted and the rotating main shaft 5 may be directly supported by the sleeve 24 .
- the plain bearing 51 is interposed between the inner ring 27 and the rotating main shaft 5 ; however, the plain bearing 51 may be omitted and the rotating main shaft 5 may be directly supported on the inner peripheral surface of the inner ring 27 .
- the inner ring 27 is formed by assembling a plurality of divided members, for example, two divided members.
- the plurality of divided members (two divided members, for example) is arranged between the rotating main shaft and the guide hole to support the rotating main shaft on inner surfaces of each divided member.
- the inner surfaces of each divided member, that is, a surface facing the rotating main shaft is also included in the “inner peripheral surface”.
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Abstract
The whirling vibration of a rotating main shaft is reduced to decrease abnormal wear of a wobble plate rotation preventing mechanism, so that durability is improved. A inner ring 27 of a wobble plate rotation preventing mechanism 21 has a first support portion 52 of which an outer peripheral surface is supported by an inner peripheral surface of a guide hole 2A of a cylinder block 2 and a second support portion 53 of which an inner peripheral surface supports the rotating main shaft via a plain bearing 51, and the first support portion 52 and the second support portion 53 are arranged to overlap within a range from a minimum inclination angle of a swash plate 8 to a maximum inclination angle of the swash plate 8 in an axial direction of a rotating main shaft 5.
Description
- The present invention relates to a wobble plate type variable displacement compressor in which a piston is reciprocated by a wobble plate which swings along with the rotation of a rotating main shaft, and specifically, relates to a wobble plate type variable displacement compressor used in a refrigerant circulating device for a vehicle air conditioning system, and the like.
- As this type of wobble plate type variable displacement compressor, a compressor disclosed in
Patent Document 1 has been proposed. In the wobble plate type variable displacement compressor disclosed inPatent Document 1, a piston support is swung along with rotation of a swash plate synchronously rotating with a main shaft of which a front end side and a rear end side are rotatably supported by a housing via bearings, to thereby reciprocate the piston in a cylinder bore. Furthermore, by providing a rotation preventing mechanism of the piston support on a middle portion of the main shaft, and devising a structure of the rotation preventing mechanism, the whirling vibration of the main shaft occurring when the compressor is driven and noise occurring therefrom are reduced. - Patent Document 1: JP H05-99137 A
- In the rotation preventing mechanism of the wobble plate type variable displacement compressor disclosed in
Patent Document 1, onto the outer periphery of a swash plate sleeve which is installed so as to be movable in an axial direction with respect to a main shaft and rotatable integrally with the main shaft, a support sleeve is externally fitted to be rotatable relative to the swash plate sleeve, and the support sleeve is supported in the guide hole of a cylinder block (constituting a part of the housing) to be movable only in the axial direction of the main shaft. That is, the main shaft is supported on the inner peripheral surface of the support sleeve via the swash plate sleeve, and the support sleeve is supported in the guide hole of the cylinder block. However, since the supporting portion of the support sleeve which supports the main shaft and the supported portion of the support sleeve which is supported in the guide hole of the cylinder block do not overlap in the axial direction of the main shaft, with respect to the whirling vibration of the main shaft occurring when the compressor is driven, the support sleeve is supported by a cantilever structure, and thus, the effect of reducing the whirling vibration of the main shaft is insufficient. - The present invention has been made by focusing on the abovementioned problem, and it is an object of the invention to provide a wobble plate type variable displacement compressor which is able to sufficiently reduce the whirling vibration of the rotating main shaft by modifying the mounting structure of the rotation preventing mechanism.
- Thus, a wobble plate type variable displacement compressor of the present invention includes: a rotating main shaft of which a front end side and a rear end side are rotatably supported by a housing; a swash plate which synchronously rotates with the rotating main shaft and is inclinable with respect to the rotating main shaft; a wobble plate which swings along with the rotation of the swash plate with respect to the rotating main shaft to thereby reciprocate a piston in a cylinder bore; a wobble plate rotation preventing mechanism disposed at a middle portion of the rotating main shaft and prevents the wobble plate from rotating at the time of rotating the rotating main shaft. In the wobble plate type variable displacement compressor, an inclination angle of the swash plate with respect to the rotating main shaft is varied to thereby control a stroke amount of the piston. The wobble plate rotation preventing mechanism includes: a guide member which has a first support portion of which an outer peripheral surface is supported on an inner peripheral surface of a guide hole in the housing to be movable in an axial direction of the rotating main shaft and prevented from rotating around the rotating main shaft; and a connecting mechanism which connects the wobble plate to the guide member so that the wobble plate is swingable with respect to the guide member and rotation preventing force of the guide member is transmitted. The guide member further includes a second support portion of which an inner peripheral surface supports the rotating main shaft. The first support portion and the second support portion are arranged to overlap in the axial direction of the rotating main shaft.
- According to the wobble plate type variable displacement compressor of the present invention, it is possible to reduce the whirling vibration of the main shaft occurring when the compressor is driven. Thus, it is possible to improve the contact state of each part of the wobble plate rotation preventing mechanism and reduce the abnormal wear of the wobble plate rotation preventing mechanism, so that the durability of the wobble plate type variable displacement compressor is improved.
-
FIG. 1 is a sectional view illustrating a configuration example of a wobble plate type variable displacement compressor according to an embodiment of the present invention. -
FIG. 2 is a sectional view illustrating the wobble plate type variable displacement compressor ofFIG. 1 in another operating state. -
FIG. 3 is an exploded perspective view illustrating a main part including a wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor ofFIG. 1 . -
FIGS. 4A and 4B are a view illustrating an example of the wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor ofFIG. 1 ,FIG. 4A being a partial sectional view andFIG. 4B being a partial front view. - Hereinafter, an embodiment of the present invention is explained with reference to the accompanying drawings.
- A configuration example of an embodiment of a wobble plate type variable displacement compressor according to the present invention will be described with reference to
FIGS. 1 to 4A and 4B . -
FIG. 1 is a configuration example of a wobble plate type variable displacement compressor according to the present embodiment, and shows the operating state when the discharge displacement is maximum and when the inclination angle of a swash plate is maximum.FIG. 2 shows the operating state of the wobble plate type variable displacement compressor ofFIG. 1 when the discharge displacement is minimum and when the inclination angle of the swash plate is minimum.FIG. 3 is an exploded perspective view illustrating a main part including the wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor ofFIG. 1 .FIGS. 4A and 4B show an example of a wobble plate rotation preventing mechanism of the wobble plate type variable displacement compressor ofFIG. 1 . - In the wobble plate type
variable displacement compressor 1, the inclination angle of the swash plate which synchronously rotates with the rotating main shaft is varied with respect to the rotational main shaft, to change the wobble width of the wobble plate which swings along with rotation of the swash plate with respect to the rotational main shaft, to control a stroke amount of a piston, so that a refrigerant discharge displacement from a cylinder bore is varied. - In the wobble plate type
variable displacement compressor 1 ofFIG. 1 , a housing is made up of acylinder block 2 disposed at a middle portion, a front housing 3 disposed on a front side of thecylinder block 2, and a rear housing 4 disposed on a rear side of thecylinder block 2. A rotatingmain shaft 5 to which a rotational driving force is input from outside is provided to penetrate from the front housing 3 to a portion of thecylinder block 2. The front end portion of the rotatingmain shaft 5 is rotatably supported on the front housing 3 via a bearing 33 (radial bearing), and a rear end portion of the rotatingmain shaft 5 is rotatably supported on a fixed wall inside thecylinder block 2 via a bearing 22 (thrust bearing). To the rotatingmain shaft 5, arotor 6 is fixed to be rotatable integrally therewith, and a thrust bearing 32 is interposed between therotor 6 and the front housing 3. To therotor 6, aswash plate 8 is connected via ahinge mechanism 7 so as to be inclined with respect to the rotatingmain shaft 5 and synchronously rotatable with the rotatingmain shaft 5. Apiston 10 is inserted into eachcylinder bore 9 arranged in an inner peripheral edge portion of thecylinder block 2 so as to be reciprocated, and thepiston 10 is connected to awobble plate 12 via a connectingrod 11. A thrust bearing 31 is interposed between thewobble plate 12 and theswash plate 8. Thewobble plate 12 swings along with rotation of theswash plate 8 to reciprocate thepiston 10 via the connectingrod 11. Along with the reciprocation of thepiston 10, a fluid (for example, refrigerant gas) to be compressed is drawn from asuction chamber 13 formed in an inner peripheral edge portion of the rear housing 4 into thecylinder bore 9 through a suction hole 15 (a suction valve is not shown in the drawing) formed in avalve plate 14, and the drawn fluid is compressed. The compressed fluid is discharged into adischarge chamber 17 formed in an inner central portion of the rear housing 4 through a discharge hole 16 (discharge valve not shown in the drawing), and thereafter, the discharged fluid is sent to an external circuit. - The
wobble plate 12 swings in a state in which a wobble platerotation preventing mechanism 21 disposed at a middle portion of the rotatingmain shaft 5, prevents thewobble plate 12 from rotating. Hereinafter, the wobble platerotation preventing mechanism 21 will be explained. - The wobble plate
rotation preventing mechanism 21 is movable in an axial direction of the rotatingmain shaft 5, and an inner ring rotation preventing mechanism described later prevents the wobble platerotation preventing mechanism 21 from rotating around the rotatingmain shaft 5. The wobble platerotation preventing mechanism 21 includes aninner ring 27 as a guide member and a connecting mechanism which connects thewobble plate 12 to theinner ring 27. Theinner ring 27 has afirst support portion 52 of which an outer peripheral surface is supported by an inner peripheral surface of aguide hole 2A of thecylinder block 2 so as to be movable in the axial direction of the rotatingmain shaft 5 and prevented from rotating therearound, and asecond support portion 53 of which an inner peripheral surface supports the rotatingmain shaft 5 via a plain bearing 51 mounted on the inner peripheral surface. Furthermore, the connecting mechanism is configured as a so-called constant velocity universal joint. The connecting mechanism includes a plurality ofguide grooves 26 formed on theinner ring 27 for guiding balls provided for power transmission, anouter ring 30 which has a plurality ofguide grooves 28 for guiding the balls at positions facing therespective guide grooves 26 of theinner ring 27 and which functions as a supporting member which fixedly supports thewobble plate 12 on an outer peripheral portion of theouter ring 30 and rotatably supports theswash plate 8 on an outer peripheral portion of theouter ring 30 via a bearing 29 (radial bearing), a plurality ofballs 25 held by theguide grooves inner ring 27 and theouter ring 30, respectively, and performing power transmission by being compressed between theguide grooves sleeve 24 which supports the rotatingmain shaft 5 via a bearing 23 (radial bearing) and is provided so as to be rotatable relative to the rotatingmain shaft 5 and be movable in the axial direction thereof, thesleeve 24 swingably supporting theouter ring 30 and being engaged with theinner ring 27 to be movable in the axial direction together therewith on the rotatingmain shaft 5. Theouter ring 30 is swingable about thesleeve 24 relative to theinner ring 27 through spherical surface contact between theballs 25 and the guide grooves 26, 28 facing each other. Furthermore, a rotation preventing force from the side of theinner ring 27 is transmitted to the side of theouter ring 30 through the spherical surface contact between theballs 25 and theguide grooves - The abovementioned inner ring rotation preventing mechanism is configured by an abutting structure in which the
guide hole 2A of thecylinder block 2 is abutted against the outer peripheral surface of theinner ring 27 when the rotatingmain shaft 5 rotates. Specifically, the outer peripheral surface of theinner ring 27 has three peripheral surfaces formed in a substantially triangular shape of which each angle formed by adjacent peripheral surfaces is 60 degrees. Furthermore, theguide hole 2A of thecylinder block 2 is also has three peripheral surfaces formed in a substantially triangular shape of which each angle formed by adjacent peripheral surfaces is 60 degrees so as to correspond to the outer peripheral surface of theinner ring 27. At the time of rotating theinner ring 27 along with rotation of a rotatingmain shaft 5 with respect to thecylinder block 2, each edge portion of peripheral surfaces of theinner ring 27 is abutted against each peripheral surface of theguide hole 2A of thecylinder block 2 to prevent theinner ring 27 from rotating. - The inner ring rotation preventing mechanism in the wobble plate
rotation preventing mechanism 21 of the present embodiment is not limited to the abovementioned abutting structure, but may be a general rotation restricting mechanism such as a key or a spline. -
FIGS. 4A and 4B show a state in which the relative angle between the inner andouter rings rotation preventing mechanism 21. As shown inFIG. 4A , theguide grooves inner ring 27 and theouter ring 30 of the wobble platerotation preventing mechanism 21 are disposed to be inclined at relative angles (relative angles within a range of 30 to 60 degrees) relative to the center axis of the rotatingmain shaft 5. Theguide groove 26 formed on the inner ring 27 (an axis of theguide groove 26 is indicated by symbol 42) and theguide groove 28 formed on the outer ring 30 (an axis of theguide groove 28 is indicated by symbol 43), which form oneball guide 41 and face each other, are disposed so as to be symmetrically formed relative to aplane 44 which is perpendicular to the rotatingmain shaft 5 and passes through the wobble center of thewobble plate 12, in a state in which the relative angle between the axis of theinner ring 27 and the axis of theouter ring 30 is zero. Theball 25 is regulated and supported on the intersection of theaxis 42 of theguide groove 26 and theaxis 43 of theguide groove 28. Furthermore, as shown inFIG. 4B , a structure can be employed in which two ball guides adjacent to each other among a plurality of the ball guides 41 of the wobble platerotation preventing mechanism 21 are referred to be a pair of ball guides, and the respective ball guides 41 in the pair of ball guides 45, in other words, axes 46 of the guide grooves formed on the inner and outer rings in this portion, are disposed in parallel to each other. In such a structure, as aforementioned, since the play in the rotational direction in the wobble plate rotation preventing mechanism portion is schematically decided by a relation between the distance between the bottoms of the pair of guide grooves provided on the inner andouter rings balls 25 are supported in the compression direction between theguide grooves ball 25 is held by theguide grooves grooves ball 25 and therespective guide grooves balls 25 small, so that it is possible to reduce the size of the entire wobble platerotation preventing mechanism 21. - Furthermore, the load applied to the
ball 25, which is provided as a moment about the rotatingmain shaft 5, is generated as a normal reaction of an actual contact surface. The smaller inclination of a normal line of the contact surface relative to the direction of the moment is, the smaller the contact load becomes, and by a structure in which the pair of ball guides 45 disposed in parallel as described above are disposed symmetrically relative to a plane including acenter axis 5 a of the rotatingmain shaft 5, in other words, by a structure in which theaxes 46 of two sets of guide grooves formed on the inner andouter rings center axis 5 a of the rotatingmain shaft 5, the mechanism is made as a wobble plate rotation preventing mechanism which does not select the rotational direction, and it is possible to minimize the ball contact load. - In the abovementioned wobble plate
rotation preventing mechanism 21, theinner ring 27 including thefirst support portion 52 of which the outer peripheral surface is supported by the inner peripheral surface of theguide hole 2A of thecylinder block 2, further includes thesecond support portion 53 of which the inner peripheral surface supports the rotatingmain shaft 5. Thefirst support portion 52 and thesecond support portion 53 of theinner ring 27 are arranged to overlap in the axial direction of the rotatingmain shaft 5, and the wobble platerotation preventing mechanism 21 has a function of reducing the whirling vibration of the rotatingmain shaft 5. Specifically, in this embodiment, assuming that the inclination angle of theswash plate 8 perpendicular to the rotatingmain shaft 5 is 0°, within a range from a minimum inclination angle of theswash plate 8 shown inFIG. 2 to a maximum inclination angle of theswash plate 8 regulated by being abutted against therotor 6 as shown inFIG. 1 , thefirst support portion 52 and thesecond support portion 53 are arranged to overlap in the axial direction of the rotatingmain shaft 5. However, the present invention is not limited to this. Thefirst support portion 52 and thesecond support portion 53 may overlap at least at the minimum inclination angle of theswash plate 8 and may not overlap when theswash plate 8 has the maximum inclination angle, for example. - In the wobble plate type
variable displacement compressor 1 according to the present embodiment, since thefirst support portion 52 and thesecond support portion 53 are arranged to overlap in the axial direction of the rotatingmain shaft 5, a supporting structure of the middle portion of the rotatingmain shaft 5 is not a cantilever structure as in the prior art. Thus, it is possible to effectively reduce the whirling vibration of the rotatingmain shaft 5 occurring when the compressor is driven. Therefore, the rotatingmain shaft 5 is smoothly rotated, to improve contact state of each part of the wobble platerotation preventing mechanism 21 and reduce abnormal wear of the wobble platerotation preventing mechanism 21 and the like. As a result, it is possible to improve durability of the wobble plate typevariable displacement compressor 1. Furthermore, in the present embodiment, the rotatingmain shaft 5 is also supported by thesleeve 24, and thus, it is possible to further effectively reduce the whirling vibration of the rotatingmain shaft 5 to improve the durability of the wobble plate typevariable displacement compressor 1. - In the present embodiment, as the connecting mechanism which connects the
wobble plate 12 to theinner ring 27, by using the constant velocity universal joint, the rotation speed to be transmitted does not vary even when the inclination angle changes; however, the present invention is not limited to this. For example, by using a universal joint, the rotation speed to be transmitted can be varied when the inclination angle changes. - Furthermore, in the present embodiment, the
bearing 23 is interposed between thesleeve 24 and the rotatingmain shaft 5; however, the bearing 23 may be omitted and the rotatingmain shaft 5 may be directly supported by thesleeve 24. - Moreover, in the present embodiment, the
plain bearing 51 is interposed between theinner ring 27 and the rotatingmain shaft 5; however, theplain bearing 51 may be omitted and the rotatingmain shaft 5 may be directly supported on the inner peripheral surface of theinner ring 27. - There may be a case in which the
inner ring 27 is formed by assembling a plurality of divided members, for example, two divided members. In this case, the plurality of divided members (two divided members, for example) is arranged between the rotating main shaft and the guide hole to support the rotating main shaft on inner surfaces of each divided member. The inner surfaces of each divided member, that is, a surface facing the rotating main shaft is also included in the “inner peripheral surface”. -
- 1 wobble plate type variable displacement compressor
- 2 cylinder block
- 2A guide hole
- 5 rotating main shaft
- 6 rotor
- 8 swash plate
- 9 cylinder bore
- 10 piston
- 12 wobble plate
- 21 wobble plate rotation preventing mechanism
- 22, 33 radial bearing
- 24 sleeve
- 25 ball
- 26 guide groove (inner ring side)
- 27 inner ring
- 28 guide groove (outer ring side)
- 30 outer ring
- 51 plain bearing
- 52 first support portion
- 53 second support portion
Claims (5)
1. A wobble plate type variable displacement compressor comprising:
a rotating main shaft of which a front end side and a rear end side are rotatably supported by a housing;
a swash plate which synchronously rotates with the rotating main shaft and is inclinable with respect to the rotating main shaft;
a wobble plate which swings along with the rotation of the swash plate with respect to the rotating main shaft to reciprocate a piston in a cylinder bore; and
a wobble plate rotation preventing mechanism which is disposed at a middle portion of the rotating main shaft, and prevents the wobble plate from rotating at the time of rotating the rotating main shaft,
an inclination angle of the swash plate with respect to the rotating main shaft being varied to control a stroke amount of the piston,
wherein the wobble plate rotation preventing mechanism including:
a guide member which includes a first support portion of which an outer peripheral surface is supported by an inner peripheral surface of a guide hole in the housing to be movable in an axial direction of the rotating main shaft and prevented from rotating around the rotating main shaft; and
a connecting mechanism which connects the wobble plate to the guide member so that the wobble plate is swingable with respect to the guide member and rotation preventing force of the guide member is transmitted,
the guide member further including a second support portion of which an inner peripheral surface supports the rotating main shaft, and
the first support portion and the second support portion being arranged to overlap in the axial direction of the rotating main shaft.
2. The wobble plate type variable displacement compressor according to claim 1 , wherein the first support portion and the second support portion is arranged to overlap within a range from a minimum inclination angle of the swash plate to a maximum inclination angle of the swash plate in the axial direction of the rotating main shaft.
3. The wobble plate type variable displacement compressor according to claim 1 , wherein the connecting mechanism which connects the wobble plate to the guide member is a constant velocity universal joint.
4. The wobble plate type variable displacement compressor according to claim 3 , wherein the connecting mechanism includes:
a plurality of guide grooves formed on the guide member for guiding balls provided for power transmission;
a supporting member which has a plurality of guide grooves for guiding the balls at positions facing the respective guide grooves of the guide member and which fixedly supports the wobble plate on an outer peripheral portion of the supporting member and rotatably supports the swash plate on an outer peripheral portion of the supporting member via a bearing;
a plurality of balls which is held by the guide grooves facing each other and performs power transmission by being compressed between the guide grooves; and
a sleeve which swingably supports the supporting member and is engaged with the guide member to be movable in the axial direction together therewith on the rotating main shaft, and of which an inner peripheral surface supports the rotating main shaft.
5. The wobble plate type variable displacement compressor according to claim 1 , wherein the connecting mechanism which connects the wobble plate to the guide member is a universal joint.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015-071563 | 2015-03-31 | ||
JP2015071563A JP6470086B2 (en) | 2015-03-31 | 2015-03-31 | Swing plate type variable capacity compressor |
PCT/JP2016/058123 WO2016158378A1 (en) | 2015-03-31 | 2016-03-15 | Wobble plate type variable displacement compressor |
Publications (1)
Publication Number | Publication Date |
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US20180051682A1 true US20180051682A1 (en) | 2018-02-22 |
Family
ID=57006786
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/561,141 Abandoned US20180051682A1 (en) | 2015-03-31 | 2016-03-15 | Wobble Plate Type Variable Displacement Compressor |
Country Status (5)
Country | Link |
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US (1) | US20180051682A1 (en) |
JP (1) | JP6470086B2 (en) |
CN (1) | CN107429678B (en) |
DE (1) | DE112016001467T5 (en) |
WO (1) | WO2016158378A1 (en) |
Families Citing this family (1)
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JP6832173B2 (en) * | 2017-01-26 | 2021-02-24 | 本田技研工業株式会社 | Fuel supply device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110088547A1 (en) * | 2008-06-02 | 2011-04-21 | Shinji Tagami | Wobble Plate-Type Variable Displacement Compressor |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4145163A (en) * | 1977-09-12 | 1979-03-20 | Borg-Warner Corporation | Variable capacity wobble plate compressor |
JPS5596377A (en) * | 1979-01-13 | 1980-07-22 | Sanden Corp | Oscillating type compressor |
US4526516A (en) * | 1983-02-17 | 1985-07-02 | Diesel Kiki Co., Ltd. | Variable capacity wobble plate compressor capable of controlling angularity of wobble plate with high responsiveness |
JPH0599137A (en) * | 1991-10-14 | 1993-04-20 | Hitachi Ltd | Variable capacity compressor |
US5509346A (en) * | 1995-05-30 | 1996-04-23 | General Motors Corporation | Variable displacement compressor with simplified torque restraint |
JP5164563B2 (en) * | 2007-12-28 | 2013-03-21 | サンデン株式会社 | Swing plate type variable capacity compressor |
JP2010065599A (en) * | 2008-09-10 | 2010-03-25 | Sanden Corp | Wobble plate variable displacement compressor |
JP5519193B2 (en) * | 2009-06-05 | 2014-06-11 | サンデン株式会社 | Variable capacity compressor |
JP2011153592A (en) * | 2010-01-28 | 2011-08-11 | Sanden Corp | Compressor |
JP2013060838A (en) * | 2011-09-12 | 2013-04-04 | Ntn Corp | Rotation prevention mechanism for oscillation plate of oscillating-swash-plate type variable-capacity compressor, and constant-velocity universal coupling configuring the same |
JP6125237B2 (en) * | 2013-01-15 | 2017-05-10 | サンデンホールディングス株式会社 | Swing plate type variable capacity compressor |
-
2015
- 2015-03-31 JP JP2015071563A patent/JP6470086B2/en active Active
-
2016
- 2016-03-15 CN CN201680018807.5A patent/CN107429678B/en not_active Expired - Fee Related
- 2016-03-15 WO PCT/JP2016/058123 patent/WO2016158378A1/en active Application Filing
- 2016-03-15 DE DE112016001467.8T patent/DE112016001467T5/en not_active Withdrawn
- 2016-03-15 US US15/561,141 patent/US20180051682A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110088547A1 (en) * | 2008-06-02 | 2011-04-21 | Shinji Tagami | Wobble Plate-Type Variable Displacement Compressor |
Also Published As
Publication number | Publication date |
---|---|
JP2016191347A (en) | 2016-11-10 |
WO2016158378A1 (en) | 2016-10-06 |
CN107429678A (en) | 2017-12-01 |
JP6470086B2 (en) | 2019-02-13 |
CN107429678B (en) | 2019-07-09 |
DE112016001467T5 (en) | 2017-12-14 |
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