US20080226471A1 - Variable displacement compressor - Google Patents
Variable displacement compressor Download PDFInfo
- Publication number
- US20080226471A1 US20080226471A1 US12/046,154 US4615408A US2008226471A1 US 20080226471 A1 US20080226471 A1 US 20080226471A1 US 4615408 A US4615408 A US 4615408A US 2008226471 A1 US2008226471 A1 US 2008226471A1
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- US
- United States
- Prior art keywords
- swash plate
- rotary support
- rotation
- balance weight
- pressure chamber
- 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
- F04B27/10—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
- F04B27/109—Lubrication
Definitions
- the present invention relates to a variable displacement compressor, in which the pressure in a control pressure chamber accommodating a swash plate is adjusted to control the inclination angle of the swash plate so that the displacement is controlled.
- a swash plate is tiltably accommodated in a crank chamber (control pressure chamber).
- the control pressure chamber is supplied with refrigerant of a discharge chamber (discharge pressure zone), and the refrigerant in the crank chamber is discharged to a suction pressure zone, so that the pressure in the crank chamber is adjusted.
- the inclination angle of the swash plate decreases. This decreases the displacement.
- the inclination angle of the swash plate increases. This increases the displacement.
- Lubricant is provided in the crank chamber.
- Lubricant stored in a bottom portion of the crank chamber is sheared (agitated) by a thrust flange (rotary support), which rotates integrally with the rotary shaft, and the swash plate, which splashes the lubricant.
- the splashed lubricant lubricates the parts that need lubrication in the crank chamber.
- the swash plate is linked to the thrust flange by means of a link mechanism, which rotates integrally with the thrust flange.
- a counterweight that corresponds to the link mechanism is provided to the thrust flange or the swash plate.
- the thrust flange and the swash plate shear lubricant stored in the bottom portion of the crank chamber.
- the temperature of the lubricant is excessively raised. This can degrade the lubrication performance of the lubricant.
- the greater the rotational resistance the greater the power loss becomes.
- a variable displacement compressor having a swash plate tiltably accommodated in a control pressure chamber. Refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled.
- the compressor includes a rotary shaft having a rotation axis, a rotary support that rotates integrally with the rotary shaft, a link mechanism, a first balance weight, and a second balance weight. The link mechanism links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable.
- the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate.
- the first balance weight is provided on the rotary support and corresponds to the link mechanism.
- the second balance weight is provided on the swash plate and corresponds to the link mechanism.
- At least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a slope on a leading side in the rotation direction of the rotary shaft. The slope has a leading end in the rotation direction and is shaped to descend in the direction of the rotation axis toward the leading end.
- a variable displacement compressor having a swash plate tiltably accommodated in a control pressure chamber. Refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled.
- the compressor includes a rotary shaft having a rotation axis, a rotary support that rotates integrally with the rotary shaft, a link mechanism, a first balance weight, and a second balance weight. The link mechanism links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable.
- the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate.
- the first balance weight is provided on the rotary support and corresponds to the link mechanism.
- the second balance weight is provided on the swash plate and corresponds to the link mechanism.
- At least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a step on a leading side in the rotation direction of the rotary shaft, and the step is covered with a cover so as to suppress rotational resistance generated as the lubricant in the control pressure chamber is sheared by rotation of the rotary support or the swash plate.
- a variable displacement compressor having a swash plate tiltably accommodated in a control pressure chamber. Refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled.
- the compressor includes a rotary shaft having a rotation axis, a rotary support that rotates integrally with the rotary shaft, a link mechanism, a first balance weight, and a second balance weight. The link mechanism links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable.
- the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate.
- a first appendage attached to the rotary support and a second appendage attached to the swash plate When at least one of the rotary support and the swash plate is defined as a body of revolution, the body of revolution having on a surface of a part of the body of revolution except a portion on which the appendage is formed, a plane of rotation that is formed all around the rotation axis.
- a recess is formed in the plane of rotation, and wherein the recess is located on the same side as the appendage with respect to the axis.
- FIG. 1A is a cress-sectional side view showing a whole variable displacement compressor according to a first embodiment of the present invention
- FIG. 1B is a perspective view illustrating the rotary support of FIG. 1A ;
- FIG. 2A is a cross-sectional view taken along line 2 A- 2 A of FIG. 1A ;
- FIG. 2B is a cross-sectional view taken along line 2 B- 2 B of FIG. 2A ;
- FIG. 2C is a cross-sectional view taken along line 2 C- 2 C of FIG. 2A ;
- FIG. 3 is a cross-sectional view taken along line 3 - 3 of FIG. 1A ;
- FIGS. 4A and 4B are perspective views each illustrating a rotary support according to a second embodiment of the present invention.
- FIG. 5A is a partial cross-sectional side view illustrating a variable displacement compressor according to a third embodiment of the present invention.
- FIG. 5B is a cross-sectional view taken along line 5 B- 5 B of FIG. 5A ;
- FIG. 6A is a perspective view illustrating the rotary support of FIG. 5B ;
- FIGS. 6B and 6C are perspective views each showing the cover of FIG. 6A ;
- FIG. 7A is a side cross-sectional view showing a rotary support of a variable displacement compressor according to a fourth embodiment of the present invention.
- FIG. 7B is a perspective view illustrating the ring of FIG. 7A ;
- FIG. 7C is a perspective view illustrating the rotary support of FIG. 7A ;
- FIG. 8 is a partial cross-sectional side view illustrating a variable displacement compressor according to a fifth embodiment of the present invention.
- FIG. 9 is a cross-sectional view taken along line 9 - 9 of FIG. 8 ;
- FIG. 10A is a front view illustrating a swash plate according to another embodiment of the present invention.
- FIG. 10B is a rear view illustrating a swash plate according to another embodiment of the present invention.
- FIGS. 1A to 3 A first embodiment of the present invention will now be described with reference to FIGS. 1A to 3 .
- a front housing member 12 is coupled to the front end of a cylinder 11 .
- a rear housing member 13 is coupled to the rear end of the cylinder 11 .
- the cylinder 11 , the front housing member 12 , and the rear housing member 13 form a whole housing of a variable displacement compressor 10 .
- the front housing member 12 and the cylinder 11 define a control pressure chamber 121 , and rotatably support a rotary shaft 14 .
- the rotary shaft 14 projects from the control pressure chamber 121 to the outside, and receives power from an external power source (for example, a vehicle engine).
- a rotary support 17 is fixed to the rotary shaft 14 , and a swash plate 18 is supported on the rotary shaft 14 .
- the swash plate 18 is permitted to slide in a direction of a rotation axis 141 of the rotary shaft 14 and to incline with respect to the rotary shaft 14 .
- an arm 19 is integrally formed with the rotary support 17 on a surface 171 opposed to the swash plate 18 .
- a pair of guide holes 191 , 192 are formed in the arm 19 .
- a pair of support brackets 20 and a balance weight 34 are integrally formed with the swash plate 18 on a surface 181 opposed to the rotary support 17 .
- a guide pin 21 is fixed to each support bracket 20 .
- Each of the guide holes 191 , 192 slidably receives the corresponding one of the guide pins 21 .
- the engagement of the guide holes 191 , 192 with the guide pins 21 allows the swash plate 18 to move along the rotation axis 141 of the rotary shaft 14 while being inclined, and to rotate integrally with the rotary shaft 14 .
- the swash plate 18 is inclined by sliding the guide pins 21 with respect to the guide holes 191 , 192 , and sliding the swash plate 18 with respect to the rotary shaft 14 .
- the arm 19 , the guide holes 191 , 192 , the support brackets 20 , and the guide pins 21 form a link mechanism 22 .
- the link mechanism 22 links the swash plate 18 to the rotary support 17 , which rotates integrally with the rotary shaft 14 , in such a manner that the inclination angle of the swash plate 18 is changeable.
- the arm 19 is an appendage attached to the rotary support 17 included in the link mechanism 22 .
- the support brackets 20 and the guide pins 21 are appendages attached to the swash plate 18 included in the link mechanism 22 .
- the maximum inclination angle of the swash plate 18 is defined by the contact between the rotary support 17 and the swash plate 18 .
- the swash plate 18 is at the maximum inclination position.
- the swash plate 18 is at the minimum inclination position.
- cylinder bores 111 are formed in and extend through the cylinder 11 .
- a piston 23 is retained in each cylinder bore 111 .
- the rotation of the swash plate 18 is converted to reciprocation of the pistons 23 by means of shoes 24 .
- each piston 23 reciprocates in the corresponding cylinder bore 111 .
- a suction chamber 131 and a discharge chamber 132 are defined in the rear housing member 13 .
- refrigerant in the suction chamber 131 which is a suction pressure zone, is drawn into the associated cylinder bore 111 through a suction port 15 while flexing a suction valve flap 151 .
- gaseous refrigerant in the corresponding cylinder bore 111 is discharged to the discharge chamber 132 through a discharge port 16 while flexing a discharge valve flap 161 .
- Refrigerant that is discharged to the discharge chamber 132 which is a discharge pressure zone, flows out to an external refrigerant circuit (not shown) located outside of the compressor 10 . After being discharged to the external refrigerant circuit, the refrigerant is returned to the suction chamber 131 .
- the discharge chamber 132 is connected to the control pressure chamber 121 by a supply passage 25 .
- the control pressure chamber 121 is connected td the scion chamber 131 by a release passage 26 . Refrigerant in the control pressure chamber 121 flows to the suction chamber 131 through the 35 release passage 26 .
- An electromagnetic displacement control valve 27 is installed in the rear housing member 13 . The electromagnetic displacement control valve 27 regulates the flow passage area of the supply passage 25 . When the opening degree of the electromagnetic displacement control valve 27 is increased, the flow passage area of the supply passage 25 is increased. This increases the amount of refrigerant supplied from the discharge chamber 132 to the suction chamber 131 , thereby increasing the pressure in the control pressure chamber 121 .
- the inclination angle of the swash plate 18 is reduced.
- the opening degree of the electromagnetic displacement control valve 27 is decreased, the flow passage area of the supply passage 25 is decreased. This reduces the amount of refrigerant supplied from the discharge chamber 132 to the suction chamber 131 , thereby lowering the pressure in the control pressure chamber 121 . Accordingly, the inclination angle of the swash plate 18 is increased.
- the balance weight 28 is integrally formed on the opposed surface 171 of the rotary support 17 .
- the balance weight 28 is located in an opposite side of the arm 19 with respect to the rotation axis 141 .
- the balance weight 28 is formed as a projection having a shape of a circular arc about the rotation axis 141 .
- Each of an outer peripheral surface 282 and an inner peripheral surface 283 of the balance weight 28 is a part of an imaginary circumferential surface about the rotation axis 141 .
- the outer peripheral surface 282 and the inner peripheral surface 283 are planes of rotation created by rotation trajectories when lines parallel to the rotation axis 141 are rotated about the rotation axis 141 . No step is formed in the outer peripheral surface 282 or the inner peripheral surface 283 along the circumferential direction.
- An outer peripheral surface 174 of the rotary support 17 is a circumferential surface about the rotation axis 141 .
- the radius of the outer peripheral surface 174 is substantially equal to the radius of the cuter peripheral surface 282 .
- the outer peripheral surface 174 is a plane of rotation created by rotation trajectory when a line parallel to the rotation axis 141 is rotated about the rotation axis 141 . No step is formed in the outer peripheral surface 174 along the circumferential direction.
- the rotary support 17 rotates about the rotation axis 141 in a rotation direction indicated by arrow R.
- a step of the balance weight 28 on a leading side in the rotation direction R of the rotary support 17 forms a slope 281 .
- the leading side has a leading end.
- the slope 281 is shaped to descend in the direction of the rotation axis 141 toward the opposed surface 171 in the rotation direction R. In other words, the slope 281 is shaped to descend in the direction of the rotation axis 141 toward the leading end.
- the arm 19 is substantially shaped like a circular arc projection about the rotation axis 141 .
- An outer peripheral surface 194 of the arm 19 is a part of an imaginary circumferential surface about the rotation axis 141 .
- the outer peripheral surface 194 is a plane of rotation created by rotation trajectory when a line parallel to the rotation axis 141 is rotated about the rotation axis 141 . No step is formed in the outer peripheral surface 194 along the circumferential direction.
- a step of the arm 19 on a leading side in the rotation direction R of the rotary support 17 forms a slope 193 .
- the leading side has a leading end.
- the slope 193 is shaped to descend in the direction of the rotation axis 141 toward the opposed surface 171 in the rotation direction R. In other words, the slope 193 is shaped to descend in the direction of the rotation axis 141 toward the leading end.
- lubricant Y is stored in the control pressure chamber 121 .
- the lubricant Y stored in a bottom portion of the control pressure chamber 121 is sheared and splashed so that the lubricant Y lubricates parts in the control pressure chamber 121 that need lubrication.
- the first embodiment provides the following advantages.
- the slopes 193 , 281 are easily formed as a simple structure for suppressing rotational resistance generated when the lubricant Y in the control pressure chamber 121 is sheared.
- Each of the outer peripheral surface 282 and the inner peripheral surface 283 of the balance weight 28 is a part of the imaginary circumferential surface about the rotation axis 141 .
- both the shearing resistance between the lubricant Y in the control pressure chamber 121 and the outer peripheral surface 282 and the shearing resistance between the lubricant Y and the inner peripheral surface 283 are significantly small. Therefore, the structure of the outer peripheral surface 282 and the inner peripheral surface 283 of the balance weight 28 according to the present embodiment contributes to the suppression of the rotational resistance generated when the lubricant Y in the control pressure chamber 121 is sheared.
- the outer peripheral surface 194 of the arm 19 is a part of the imaginary circumferential surface about the rotation axis 141 .
- the shearing resistance between the lubricant Y in the control pressure chamber 121 and the outer peripheral surface 194 is significantly small. Therefore, the structure of the outer peripheral surface 194 of the arm 19 contributes to the suppression of the rotational resistance generated when the lubricant Y in the control pressure chamber 121 is sheared.
- the outer peripheral surface 174 of the rotary support 17 is a circumferential surface about the rotation axis 141 .
- the shearing resistance between the lubricant Y in the control pressure chamber 121 and the outer peripheral surface 174 is significantly small. Therefore, the structure of the outer peripheral surface 174 of the rotary support 17 contributes to the suppression of the rotational resistance generated when the lubricant Y in the control pressure chamber 121 is sheared.
- an outer peripheral surface 174 of a rotary support 17 is a circumferential surface about a rotation axis 141 .
- An arc 19 is formed on an opposite surface 171 of the rotary support 17 .
- a surface of the rotary support 17 that is opposite to the surface on which an arm 19 is formed (the opposed surface 171 shown in FIG. 4A ) is referred to as a back surface 172 .
- the back surface 172 is perpendicular to the rotation axis 141 .
- the back surface 172 is a surface of a part of the rotary support 17 except a portion on which the arm 19 , which is an appendage of the rotary support 17 , is formed.
- the back surface 172 is also a plane created by rotation trajectory when a Line perpendicular to the rotation axis 141 is rotated about the rotation axis 141 . That is, the back surface 172 is a plane of rotation formed all around the rotation axis 141 .
- Recesses 173 are formed in the back surface 172 .
- the recesses 173 are located on the same side as the arm 19 with respect to the rotation axis 141 .
- a portion opposite to the arm 19 with respect to the rotation axis 141 is solid.
- This structure offers a disk-shaped outer peripheral shape that has no step intersecting the circumferential direction, and a function of a balance weight. This improves the rotation balance of the rotary support 17 .
- no step is provided in any given circumferential section spaced from the rotation axis 141 by a constant distance.
- the recesses 173 create steps on the back surface 172 , which is a 25 plane of rotation.
- the recesses 173 are formed by recessing the back surface 172 , the rotational resistance at the recesses 173 generated when lubricant is sheared by the rotary support 17 is smaller than the rotational resistance generated at a projection formed on a plane of rotation.
- the recesses 173 in she flat back surface 172 are easily formed.
- the recesses 173 formed in the back surface 172 which is a plane of rotation, has a simple structure as a rotational resistance suppressing portion that suppresses rotational resistance related to lubricant.
- the second embodiment has the same advantage as the advantage (5) of the first embodiment.
- FIGS. 5A to 6C A third embodiment will now be described with reference to FIGS. 5A to 6C . Same reference numerals are used for those components which are the same as the corresponding components of the first embodiment.
- an arm 19 A is integrally formed with a rotary support 17 A on an opposed surface 171 .
- a guide hole 195 is formed in the arm 19 A.
- a pair of support brackets 29 are attached to an opposed surface 181 of a swash plate 18 .
- a guide pin 30 extends between and is supported by the support brackets 29 .
- the guide pin 30 is fitted in the guide hole 195 .
- the arm 19 A, the guide hole 195 , the support brackets 29 , and the guide pin 30 form a link mechanism 22 A.
- the link mechanism 22 A links the swash plate 18 to the rotary support 17 A, which rotates integrally with the rotary shaft 14 , in such a manner that the inclination angle of the swash plate 18 is changeable.
- the arm 19 A is an appendage attached to the rotary support 17 A included in the link mechanism 22 A.
- the support brackets 29 and the guide pin 30 are appendages attached to the swash plate 18 included in the link mechanism 22 A.
- a balance weight 28 A is formed on the rotary support 17 A.
- the balance weight 28 A is formed as a circular arc about the rotation axis 141 .
- the radius of an outer peripheral surface 282 of the balance weight 28 A is greater than the radius of the cuter peripheral surface 175 of the rotary support 17 A.
- a rotational resistance suppressing cover 31 made of synthetic resin is attached to the outer periphery of the rotary support 17 A on the same side as the arm 19 A with respect to the rotation axis 141 .
- the rotational resistance suppressing cover 31 is attached to the rotary support 17 A, for example, by adhesive.
- the rotational resistance suppressing cover 31 is substantially formed as a circular arc.
- An outer peripheral surface 311 of the rotational resistance suppressing cover 31 is a part of an imaginary circumferential surface having the same radius as the outer peripheral surface 282 of the balance weight 28 A.
- the outer peripheral surface 311 and the cuter peripheral surface 282 are planes of rotation created by rotation trajectories when lines parallel to the rotation axis 141 are rotated about the rotation axis 141 .
- the outer peripheral surface 311 of the rotational resistance suppressing cover 31 attached to the rotary support 17 A smoothly continuous to the outer peripheral surface 282 of the balance weight 28 A.
- the outer peripheral surface 282 of the balance weight 28 A and the outer peripheral surface 311 of the rotational resistance suppressing cover 31 each form a plane of rotation that is formed all around the rotation axis 141 .
- No step is formed in the outer peripheral surface 311 or the outer peripheral surface 282 along the circumferential direction.
- a front surface 312 of the rotational resistance suppressing cover 31 is flat and attached to the rotary support 17 A. Also, the front surface 312 is flush with a flat front surface 286 of the balance weight 28 A.
- the rotational resistance suppressing cover 31 covers the step between the outer peripheral surface 282 of the balance weight 28 A and outer peripheral surface 175 of the rotary support 17 A, and the step between the front surface 286 of the balance weight 28 A and the opposed surface 171 of the rotary support 17 A. That is, the rotational resistance suppressing cover 31 covers an end face 284 , which is a step of the balance weight 28 A, and an end face 285 , which is a step of an leading end portion of the balance weight 28 A in the rotation direction R.
- the rotational resistance generated as lubricant is sheared by the rotary support 17 A is suppressed.
- FIGS. 7A to 7C A fourth embodiment will now be described with reference to FIGS. 7A to 7C . Same reference numerals are used for those components which are the same as the corresponding components of the third embodiment.
- an outer peripheral surface 174 of a rotary support 17 B is a circumferential surface about the rotation axis 141 .
- the radius of an outer peripheral surface 282 of a balance weight 28 B is equal to the radius of the cuter peripheral surface 174 of the rotary support 17 B.
- a metal ring 32 shown in FIG. 7B is press fitted to the outer peripheral surface 174 of the rotary support 17 B and the outer peripheral surface 282 of the balance weight 28 B.
- the ring 32 which is a rotational resistance suppressing cover, covers the outer peripheral surface 174 of the rotary support 17 B and the outer peripheral surface 282 of the balance weight 28 B, and end faces (steps) 287 , 288 of the balance weight 28 B are located inside the ring 32 .
- An outer peripheral surface 321 of the ring 32 is a circumferential surface about the rotation axis 141 .
- the outer peripheral surface 321 is a plane of rotation created by rotation trajectory when a line parallel to the rotation axis 141 is rotated about the rotation axis 141 . No step is formed in the outer peripheral surface 321 along the circumferential direction.
- the structure in which the end faces 287 , 288 of the balance weight 28 B are located inside the ring 32 generates 35 less rotational resistance due to shearing of lubricant by the rotary support 17 B compared to a structure in which the end faces 287 , 288 of the balance weight 28 B are located outside of the ring 32 .
- the fourth embodiment has the same advantage as the advantage (5) of the first embodiment.
- a fifth embodiment will now be described with reference to FIGS. 8 and 9 . Same reference numerals are used for those components which are the same as the corresponding components of the first embodiment.
- a base plate 33 is fixed to the opposed surface 181 of the swash plate 18 .
- a balance weight 34 A and a pair of support brackets are formed integrally on a surface of the base plate 33 that is opposed to the rotary support 17 .
- the balance weight 34 A is formed as a circular.
- a synthetic resin cover 35 is fixed to the opposed surface 331 of the base plate 33 .
- a recess 36 is formed on a contact surface 332 of the base plate 33 that contacts the opposed surface 181 of the swash plate 18 .
- the recess 36 faces the support brackets 20 .
- a recess 37 which faces the recess 36 , is formed in the opposed surface 181 of the swash plate 18 .
- the recesses 36 , 37 reduce the size (weight) of the balance weight 34 A.
- the cover 35 which is a rotational resistance suppressing cover, covers most of the opposed surface 331 of the base plate 33 , and an outer peripheral surface 351 of the cover 35 is a circumferential surface about the rotation axis 141 .
- the height of the cover 35 is substantially equal to the height of the balance weight 34 A, and most of the balance weight 34 A and many portions of the support brackets 20 are located inside the cover 35 . Rotational resistance in this structure due to shearing of lubricant is less than that in a structure without the cover 35 .
- each support bracket 20 of the swash plate 18 may form a slope 203 similarly to the slope 193 provided on the arm 19 of the rotary support 17 shown in FIG. 2 .
- a slope 341 may be provided on the balance weight 34 of the swash plate 18 as shown in FIG. 10A similarly to the slope 281 provided on the balance weight 28 of the rotary support 17 shown in FIG. 2 .
- recesses 183 may be provided on the back surface 182 of the swash plate 18 similarly to the recesses 173 provided on the back surface 172 of the rotary support 17 shown in FIG. 4B .
- the rotary support 17 A may be placed in the mold for molding the rotational resistance suppressing cover 31 , so that the rotational resistance suppressing cover 31 is formed through insert molding.
- the rotary support 17 A is fixed to the rotational resistance suppressing cover 31 at the same time as the molding of the rotary support 17 A, which facilitates the manufacture.
- the rotational resistance suppressing cover 31 may be integrally formed with the rotary support 17 A as a single member. Specifically, the rotational resistance suppressing cover 31 , the arm 19 A as the appendage, and the balance weight 28 A are integrally formed with the rotary support 17 A. Such configuration allows the strength of the arm 19 A to be easily increased and facilitates the manufacture of the rotary support 17 A.
- the rotational resistance suppressing cover 31 may have any structure as long as it covers steps, thereby reducing the steps.
- the outer peripheral surface 174 of the rotary support 17 may be a conical plane of rotation or a plane of rotation created by rotation trajectory when a curve is rotated about the rotation axis 141 .
- the outer peripheral surface 321 of the ring 32 may be a conical plane of rotation or a plane of rotation created by rotation trajectory when a curve is rotated about the rotation axis 141 .
Abstract
A variable displacement compressor including a rotary shaft, a swash plate, and a rotary support is disclosed. An inclination angle of the swash plate is changed so that the displacement of the compressor is controlled. The rotary support has a first balance weight and an arm. The swash plate has a second balance weight and a support bracket. At least one of the first balance weight, the second balance weight, the arm, and the support bracket has a slope on a leading side in the rotation direction of the rotary shaft. The slope has a leading end. The slope is shaped to descend in the direction of the rotation axis toward the leading end.
Description
- This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2007-062027 filed on Mar. 12, 2007 and Japanese Patent Application No. 2008-059227 filed on Mar. 10, 2008, the entire contents of which are incorporated herein by reference.
- The present invention relates to a variable displacement compressor, in which the pressure in a control pressure chamber accommodating a swash plate is adjusted to control the inclination angle of the swash plate so that the displacement is controlled.
- Such a variable displacement compressor is disclosed in Japanese Laid-Open Patent Publication No. 2005-23849. A swash plate is tiltably accommodated in a crank chamber (control pressure chamber). The control pressure chamber is supplied with refrigerant of a discharge chamber (discharge pressure zone), and the refrigerant in the crank chamber is discharged to a suction pressure zone, so that the pressure in the crank chamber is adjusted. When the pressure in the crank chamber increases, the inclination angle of the swash plate decreases. This decreases the displacement. When the pressure in the crank chamber decreases, the inclination angle of the swash plate increases. This increases the displacement.
- To lubricate parts in the crank chamber that need lubrication (for example, sliding portions of the swash plate and shoes), lubricant is provided in the crank chamber. Lubricant stored in a bottom portion of the crank chamber is sheared (agitated) by a thrust flange (rotary support), which rotates integrally with the rotary shaft, and the swash plate, which splashes the lubricant. The splashed lubricant lubricates the parts that need lubrication in the crank chamber.
- The swash plate is linked to the thrust flange by means of a link mechanism, which rotates integrally with the thrust flange. To improve the balance of rotation of the thrust flange and the swash plate, a counterweight (balance weight) that corresponds to the link mechanism is provided to the thrust flange or the swash plate. The thrust flange and the swash plate shear lubricant stored in the bottom portion of the crank chamber. However, if a great rotational resistance is generated when the counterweight and the link mechanism shear the lubricant, the temperature of the lubricant is excessively raised. This can degrade the lubrication performance of the lubricant. Also, the greater the rotational resistance, the greater the power loss becomes.
- Accordingly, it is an objective of the present invention to suppress rotational resistance generated as lubricant in a control pressure chamber is sheared by rotation of a rotary support or a swash plate in a variable displacement compressor.
- To achieve the foregoing objective and in accordance with a first aspect of the present invention, a variable displacement compressor having a swash plate tiltably accommodated in a control pressure chamber is provided. Refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled. The compressor includes a rotary shaft having a rotation axis, a rotary support that rotates integrally with the rotary shaft, a link mechanism, a first balance weight, and a second balance weight. The link mechanism links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable. The link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate. The first balance weight is provided on the rotary support and corresponds to the link mechanism. The second balance weight is provided on the swash plate and corresponds to the link mechanism. At least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a slope on a leading side in the rotation direction of the rotary shaft. The slope has a leading end in the rotation direction and is shaped to descend in the direction of the rotation axis toward the leading end.
- In accordance with a second aspect of the present invention, a variable displacement compressor having a swash plate tiltably accommodated in a control pressure chamber is provided. Refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled. The compressor includes a rotary shaft having a rotation axis, a rotary support that rotates integrally with the rotary shaft, a link mechanism, a first balance weight, and a second balance weight. The link mechanism links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable. The link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate. The first balance weight is provided on the rotary support and corresponds to the link mechanism. The second balance weight is provided on the swash plate and corresponds to the link mechanism. At least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a step on a leading side in the rotation direction of the rotary shaft, and the step is covered with a cover so as to suppress rotational resistance generated as the lubricant in the control pressure chamber is sheared by rotation of the rotary support or the swash plate.
- In accordance with a third aspect of the present invention, a variable displacement compressor having a swash plate tiltably accommodated in a control pressure chamber is provided. Refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled. The compressor includes a rotary shaft having a rotation axis, a rotary support that rotates integrally with the rotary shaft, a link mechanism, a first balance weight, and a second balance weight. The link mechanism links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable. The link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate. When at least one of the rotary support and the swash plate is defined as a body of revolution, the body of revolution having on a surface of a part of the body of revolution except a portion on which the appendage is formed, a plane of rotation that is formed all around the rotation axis. A recess is formed in the plane of rotation, and wherein the recess is located on the same side as the appendage with respect to the axis.
- Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
- The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
-
FIG. 1A is a cress-sectional side view showing a whole variable displacement compressor according to a first embodiment of the present invention; -
FIG. 1B is a perspective view illustrating the rotary support ofFIG. 1A ; -
FIG. 2A is a cross-sectional view taken alongline 2A-2A ofFIG. 1A ; -
FIG. 2B is a cross-sectional view taken alongline 2B-2B ofFIG. 2A ; -
FIG. 2C is a cross-sectional view taken alongline 2C-2C ofFIG. 2A ; -
FIG. 3 is a cross-sectional view taken along line 3-3 ofFIG. 1A ; -
FIGS. 4A and 4B are perspective views each illustrating a rotary support according to a second embodiment of the present invention; -
FIG. 5A is a partial cross-sectional side view illustrating a variable displacement compressor according to a third embodiment of the present invention; -
FIG. 5B is a cross-sectional view taken alongline 5B-5B ofFIG. 5A ; -
FIG. 6A is a perspective view illustrating the rotary support ofFIG. 5B ; -
FIGS. 6B and 6C are perspective views each showing the cover ofFIG. 6A ; -
FIG. 7A is a side cross-sectional view showing a rotary support of a variable displacement compressor according to a fourth embodiment of the present invention; -
FIG. 7B is a perspective view illustrating the ring ofFIG. 7A ; -
FIG. 7C is a perspective view illustrating the rotary support ofFIG. 7A ; -
FIG. 8 is a partial cross-sectional side view illustrating a variable displacement compressor according to a fifth embodiment of the present invention; -
FIG. 9 is a cross-sectional view taken along line 9-9 ofFIG. 8 ; -
FIG. 10A is a front view illustrating a swash plate according to another embodiment of the present invention; and -
FIG. 10B is a rear view illustrating a swash plate according to another embodiment of the present invention. - A first embodiment of the present invention will now be described with reference to
FIGS. 1A to 3 . - As shown in
FIG. 1A , afront housing member 12 is coupled to the front end of acylinder 11. Arear housing member 13 is coupled to the rear end of thecylinder 11. Thecylinder 11, thefront housing member 12, and therear housing member 13 form a whole housing of avariable displacement compressor 10. Thefront housing member 12 and thecylinder 11 define acontrol pressure chamber 121, and rotatably support arotary shaft 14. Therotary shaft 14 projects from thecontrol pressure chamber 121 to the outside, and receives power from an external power source (for example, a vehicle engine). - A
rotary support 17 is fixed to therotary shaft 14, and aswash plate 18 is supported on therotary shaft 14. Theswash plate 18 is permitted to slide in a direction of arotation axis 141 of therotary shaft 14 and to incline with respect to therotary shaft 14. - As shown in
FIG. 2A , anarm 19 is integrally formed with therotary support 17 on asurface 171 opposed to theswash plate 18. A pair of guide holes 191, 192 are formed in thearm 19. - As shown in
FIG. 3 , a pair ofsupport brackets 20 and abalance weight 34 are integrally formed with theswash plate 18 on asurface 181 opposed to therotary support 17. Aguide pin 21 is fixed to eachsupport bracket 20. Each of the guide holes 191, 192 slidably receives the corresponding one of the guide pins 21. The engagement of the guide holes 191, 192 with the guide pins 21 allows theswash plate 18 to move along therotation axis 141 of therotary shaft 14 while being inclined, and to rotate integrally with therotary shaft 14. Theswash plate 18 is inclined by sliding the guide pins 21 with respect to the guide holes 191, 192, and sliding theswash plate 18 with respect to therotary shaft 14. - The
arm 19, the guide holes 191, 192, thesupport brackets 20, and the guide pins 21 form alink mechanism 22. Thelink mechanism 22 links theswash plate 18 to therotary support 17, which rotates integrally with therotary shaft 14, in such a manner that the inclination angle of theswash plate 18 is changeable. Thearm 19 is an appendage attached to therotary support 17 included in thelink mechanism 22. Thesupport brackets 20 and the guide pins 21 are appendages attached to theswash plate 18 included in thelink mechanism 22. - When a radial center portion of the
swash plate 10 moves toward therotary support 17, the inclination of theswash plate 18 increases. The maximum inclination angle of theswash plate 18 is defined by the contact between therotary support 17 and theswash plate 18. When in a position indicated by solid lines inFIG. 1A , theswash plate 18 is at the maximum inclination position. When in a position indicated by chain lines, theswash plate 18 is at the minimum inclination position. - As shown in
FIG. 1A , cylinder bores 111 are formed in and extend through thecylinder 11. Apiston 23 is retained in each cylinder bore 111. The rotation of theswash plate 18 is converted to reciprocation of thepistons 23 by means ofshoes 24. Thus, eachpiston 23 reciprocates in the corresponding cylinder bore 111. - A
suction chamber 131 and adischarge chamber 132 are defined in therear housing member 13. As eachpiston 23 moves from the top dead center to the bottom dead center (from the right side to the left side inFIG. 1A ), refrigerant in thesuction chamber 131, which is a suction pressure zone, is drawn into the associated cylinder bore 111 through asuction port 15 while flexing asuction valve flap 151. When eachpiston 23 moves from the bottom dead center to the top dead center (from the left side to the right side inFIG. 1A ), gaseous refrigerant in the corresponding cylinder bore 111 is discharged to thedischarge chamber 132 through adischarge port 16 while flexing adischarge valve flap 161. - Refrigerant that is discharged to the
discharge chamber 132, which is a discharge pressure zone, flows out to an external refrigerant circuit (not shown) located outside of thecompressor 10. After being discharged to the external refrigerant circuit, the refrigerant is returned to thesuction chamber 131. - The
discharge chamber 132 is connected to thecontrol pressure chamber 121 by asupply passage 25. Thecontrol pressure chamber 121 is connected td thescion chamber 131 by arelease passage 26. Refrigerant in thecontrol pressure chamber 121 flows to thesuction chamber 131 through the 35release passage 26. An electromagneticdisplacement control valve 27 is installed in therear housing member 13. The electromagneticdisplacement control valve 27 regulates the flow passage area of thesupply passage 25. When the opening degree of the electromagneticdisplacement control valve 27 is increased, the flow passage area of thesupply passage 25 is increased. This increases the amount of refrigerant supplied from thedischarge chamber 132 to thesuction chamber 131, thereby increasing the pressure in thecontrol pressure chamber 121. Accordingly, the inclination angle of theswash plate 18 is reduced. When the opening degree of the electromagneticdisplacement control valve 27 is decreased, the flow passage area of thesupply passage 25 is decreased. This reduces the amount of refrigerant supplied from thedischarge chamber 132 to thesuction chamber 131, thereby lowering the pressure in thecontrol pressure chamber 121. Accordingly, the inclination angle of theswash plate 18 is increased. - As shown in
FIG. 1B , thebalance weight 28 is integrally formed on theopposed surface 171 of therotary support 17. To improve the rotation balance of therotary support 17, thebalance weight 28 is located in an opposite side of thearm 19 with respect to therotation axis 141. Thebalance weight 28 is formed as a projection having a shape of a circular arc about therotation axis 141. Each of an outerperipheral surface 282 and an innerperipheral surface 283 of thebalance weight 28 is a part of an imaginary circumferential surface about therotation axis 141. The outerperipheral surface 282 and the innerperipheral surface 283 are planes of rotation created by rotation trajectories when lines parallel to therotation axis 141 are rotated about therotation axis 141. No step is formed in the outerperipheral surface 282 or the innerperipheral surface 283 along the circumferential direction. - An outer
peripheral surface 174 of therotary support 17 is a circumferential surface about therotation axis 141. The radius of the outerperipheral surface 174 is substantially equal to the radius of the cuterperipheral surface 282. The outerperipheral surface 174 is a plane of rotation created by rotation trajectory when a line parallel to therotation axis 141 is rotated about therotation axis 141. No step is formed in the outerperipheral surface 174 along the circumferential direction. - The
rotary support 17 rotates about therotation axis 141 in a rotation direction indicated by arrow R. A step of thebalance weight 28 on a leading side in the rotation direction R of therotary support 17 forms aslope 281. The leading side has a leading end. As shown inFIG. 2B , theslope 281 is shaped to descend in the direction of therotation axis 141 toward theopposed surface 171 in the rotation direction R. In other words, theslope 281 is shaped to descend in the direction of therotation axis 141 toward the leading end. - As shown in
FIG. 2A , thearm 19 is substantially shaped like a circular arc projection about therotation axis 141. An outerperipheral surface 194 of thearm 19 is a part of an imaginary circumferential surface about therotation axis 141. The outerperipheral surface 194 is a plane of rotation created by rotation trajectory when a line parallel to therotation axis 141 is rotated about therotation axis 141. No step is formed in the outerperipheral surface 194 along the circumferential direction. - As shown in
FIG. 2C , a step of thearm 19 on a leading side in the rotation direction R of therotary support 17 forms aslope 193. The leading side has a leading end. Theslope 193 is shaped to descend in the direction of therotation axis 141 toward theopposed surface 171 in the rotation direction R. In other words, theslope 193 is shaped to descend in the direction of therotation axis 141 toward the leading end. - As shown in
FIG. 3 , lubricant Y is stored in thecontrol pressure chamber 121. When therotary support 17 and theswash plate 18 rotate, the lubricant Y stored in a bottom portion of thecontrol pressure chamber 121 is sheared and splashed so that the lubricant Y lubricates parts in thecontrol pressure chamber 121 that need lubrication. - The first embodiment provides the following advantages.
- (1) When the
rotary support 17 rotates, theslopes control pressure chamber 121. Therefore, the rotational resistance generated when the lubricant Y in thecontrol pressure chamber 121 is sheared as therotary support 17 rotates is suppressed. As a result, the temperature increase of the lubricant Y and the power loss are suppressed. - (2) The
slopes control pressure chamber 121 is sheared. - (3) Each of the outer
peripheral surface 282 and the innerperipheral surface 283 of thebalance weight 28 is a part of the imaginary circumferential surface about therotation axis 141. Thus, both the shearing resistance between the lubricant Y in thecontrol pressure chamber 121 and the outerperipheral surface 282 and the shearing resistance between the lubricant Y and the innerperipheral surface 283 are significantly small. Therefore, the structure of the outerperipheral surface 282 and the innerperipheral surface 283 of thebalance weight 28 according to the present embodiment contributes to the suppression of the rotational resistance generated when the lubricant Y in thecontrol pressure chamber 121 is sheared. - (4) The outer
peripheral surface 194 of thearm 19 is a part of the imaginary circumferential surface about therotation axis 141. Thus, the shearing resistance between the lubricant Y in thecontrol pressure chamber 121 and the outerperipheral surface 194 is significantly small. Therefore, the structure of the outerperipheral surface 194 of thearm 19 contributes to the suppression of the rotational resistance generated when the lubricant Y in thecontrol pressure chamber 121 is sheared. - (5) The outer
peripheral surface 174 of therotary support 17 is a circumferential surface about therotation axis 141. Thus, the shearing resistance between the lubricant Y in thecontrol pressure chamber 121 and the outerperipheral surface 174 is significantly small. Therefore, the structure of the outerperipheral surface 174 of therotary support 17 contributes to the suppression of the rotational resistance generated when the lubricant Y in thecontrol pressure chamber 121 is sheared. - A second embodiment will now be described with reference to
FIG. 4 . Same reference numerals are used for those components which are the same as the corresponding components of the first embodiment. - As shown in
FIG. 4A , an outerperipheral surface 174 of arotary support 17 is a circumferential surface about arotation axis 141. Anarc 19 is formed on anopposite surface 171 of therotary support 17. As shown inFIG. 4B , a surface of therotary support 17 that is opposite to the surface on which anarm 19 is formed (theopposed surface 171 shown inFIG. 4A ) is referred to as aback surface 172. Theback surface 172 is perpendicular to therotation axis 141. Theback surface 172 is a surface of a part of therotary support 17 except a portion on which thearm 19, which is an appendage of therotary support 17, is formed. Theback surface 172 is also a plane created by rotation trajectory when a Line perpendicular to therotation axis 141 is rotated about therotation axis 141. That is, theback surface 172 is a plane of rotation formed all around therotation axis 141. -
Recesses 173 are formed in theback surface 172. Therecesses 173 are located on the same side as thearm 19 with respect to therotation axis 141. A portion opposite to thearm 19 with respect to therotation axis 141 is solid. This structure offers a disk-shaped outer peripheral shape that has no step intersecting the circumferential direction, and a function of a balance weight. This improves the rotation balance of therotary support 17. - If no
recesses 173 are provided in theback surface 172, no step is provided in any given circumferential section spaced from therotation axis 141 by a constant distance. Therecesses 173 create steps on theback surface 172, which is a 25 plane of rotation. However, since therecesses 173 are formed by recessing theback surface 172, the rotational resistance at therecesses 173 generated when lubricant is sheared by therotary support 17 is smaller than the rotational resistance generated at a projection formed on a plane of rotation. Therecesses 173 in she flatback surface 172 are easily formed. Therecesses 173 formed in theback surface 172, which is a plane of rotation, has a simple structure as a rotational resistance suppressing portion that suppresses rotational resistance related to lubricant. - The second embodiment has the same advantage as the advantage (5) of the first embodiment.
- A third embodiment will now be described with reference to
FIGS. 5A to 6C . Same reference numerals are used for those components which are the same as the corresponding components of the first embodiment. - As shown in
FIG. 5A , anarm 19A is integrally formed with arotary support 17A on anopposed surface 171. Aguide hole 195 is formed in thearm 19A. A pair ofsupport brackets 29 are attached to anopposed surface 181 of aswash plate 18. As shown inFIG. 5B , aguide pin 30 extends between and is supported by thesupport brackets 29. Theguide pin 30 is fitted in theguide hole 195. Thearm 19A, theguide hole 195, thesupport brackets 29, and theguide pin 30 form alink mechanism 22A. Thelink mechanism 22A links theswash plate 18 to therotary support 17A, which rotates integrally with therotary shaft 14, in such a manner that the inclination angle of theswash plate 18 is changeable. Thearm 19A is an appendage attached to therotary support 17A included in thelink mechanism 22A. Thesupport brackets 29 and theguide pin 30 are appendages attached to theswash plate 18 included in thelink mechanism 22A. - As shown in
FIG. 6A , abalance weight 28A is formed on therotary support 17A. Thebalance weight 28A is formed as a circular arc about therotation axis 141. The radius of an outerperipheral surface 282 of thebalance weight 28A is greater than the radius of the cuterperipheral surface 175 of therotary support 17A. A rotationalresistance suppressing cover 31 made of synthetic resin is attached to the outer periphery of therotary support 17A on the same side as thearm 19A with respect to therotation axis 141. The rotationalresistance suppressing cover 31 is attached to therotary support 17A, for example, by adhesive. - As shown in
FIGS. 6B and 6C , the rotationalresistance suppressing cover 31 is substantially formed as a circular arc. An outerperipheral surface 311 of the rotationalresistance suppressing cover 31 is a part of an imaginary circumferential surface having the same radius as the outerperipheral surface 282 of thebalance weight 28A. The outerperipheral surface 311 and the cuterperipheral surface 282 are planes of rotation created by rotation trajectories when lines parallel to therotation axis 141 are rotated about therotation axis 141. The outerperipheral surface 311 of the rotationalresistance suppressing cover 31 attached to therotary support 17A smoothly continuous to the outerperipheral surface 282 of thebalance weight 28A. That is, the outerperipheral surface 282 of thebalance weight 28A and the outerperipheral surface 311 of the rotationalresistance suppressing cover 31 each form a plane of rotation that is formed all around therotation axis 141. No step is formed in the outerperipheral surface 311 or the outerperipheral surface 282 along the circumferential direction. - A
front surface 312 of the rotationalresistance suppressing cover 31 is flat and attached to therotary support 17A. Also, thefront surface 312 is flush with a flatfront surface 286 of thebalance weight 28A. - The rotational
resistance suppressing cover 31 covers the step between the outerperipheral surface 282 of thebalance weight 28A and outerperipheral surface 175 of therotary support 17A, and the step between thefront surface 286 of thebalance weight 28A and theopposed surface 171 of therotary support 17A. That is, the rotationalresistance suppressing cover 31 covers anend face 284, which is a step of thebalance weight 28A, and anend face 285, which is a step of an leading end portion of thebalance weight 28A in the rotation direction R. Thus, the rotational resistance generated as lubricant is sheared by therotary support 17A is suppressed. - A fourth embodiment will now be described with reference to
FIGS. 7A to 7C . Same reference numerals are used for those components which are the same as the corresponding components of the third embodiment. - As shown in
FIG. 7C , an outerperipheral surface 174 of arotary support 17B is a circumferential surface about therotation axis 141. The radius of an outerperipheral surface 282 of abalance weight 28B is equal to the radius of the cuterperipheral surface 174 of therotary support 17B. - As shown in
FIG. 7A , ametal ring 32 shown inFIG. 7B is press fitted to the outerperipheral surface 174 of therotary support 17B and the outerperipheral surface 282 of thebalance weight 28B. Thering 32, which is a rotational resistance suppressing cover, covers the outerperipheral surface 174 of therotary support 17B and the outerperipheral surface 282 of thebalance weight 28B, and end faces (steps) 287, 288 of thebalance weight 28B are located inside thering 32. An outerperipheral surface 321 of thering 32 is a circumferential surface about therotation axis 141. The outerperipheral surface 321 is a plane of rotation created by rotation trajectory when a line parallel to therotation axis 141 is rotated about therotation axis 141. No step is formed in the outerperipheral surface 321 along the circumferential direction. - The structure in which the end faces 287, 288 of the
balance weight 28B are located inside thering 32 generates 35 less rotational resistance due to shearing of lubricant by therotary support 17B compared to a structure in which the end faces 287, 288 of thebalance weight 28B are located outside of thering 32. - The fourth embodiment has the same advantage as the advantage (5) of the first embodiment.
- A fifth embodiment will now be described with reference to
FIGS. 8 and 9 . Same reference numerals are used for those components which are the same as the corresponding components of the first embodiment. - As shown in
FIG. 8 , abase plate 33 is fixed to theopposed surface 181 of theswash plate 18. As shown inFIG. 9 , abalance weight 34A and a pair of support brackets are formed integrally on a surface of thebase plate 33 that is opposed to therotary support 17. Thebalance weight 34A is formed as a circular. Asynthetic resin cover 35 is fixed to theopposed surface 331 of thebase plate 33. - As shown in
FIG. 8 , arecess 36 is formed on acontact surface 332 of thebase plate 33 that contacts theopposed surface 181 of theswash plate 18. Therecess 36 faces thesupport brackets 20. Arecess 37, which faces therecess 36, is formed in theopposed surface 181 of theswash plate 18. Therecesses balance weight 34A. - The
cover 35, which is a rotational resistance suppressing cover, covers most of theopposed surface 331 of thebase plate 33, and an outerperipheral surface 351 of thecover 35 is a circumferential surface about therotation axis 141. The height of thecover 35 is substantially equal to the height of thebalance weight 34A, and most of thebalance weight 34A and many portions of thesupport brackets 20 are located inside thecover 35. Rotational resistance in this structure due to shearing of lubricant is less than that in a structure without thecover 35. - It should be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention. Particularly, it should be understood that the invention may be embodied in the following forms.
- As shown in
FIG. 10A , eachsupport bracket 20 of theswash plate 18 may form aslope 203 similarly to theslope 193 provided on thearm 19 of therotary support 17 shown inFIG. 2 . Also, aslope 341 may be provided on thebalance weight 34 of theswash plate 18 as shown inFIG. 10A similarly to theslope 281 provided on thebalance weight 28 of therotary support 17 shown inFIG. 2 . - As shown in
FIG. 10B , recesses 183 may be provided on theback surface 182 of theswash plate 18 similarly to therecesses 173 provided on theback surface 172 of therotary support 17 shown inFIG. 4B . - In the third embodiment, the
rotary support 17A may be placed in the mold for molding the rotationalresistance suppressing cover 31, so that the rotationalresistance suppressing cover 31 is formed through insert molding. In this case, therotary support 17A is fixed to the rotationalresistance suppressing cover 31 at the same time as the molding of therotary support 17A, which facilitates the manufacture. - In the third embodiment, the rotational
resistance suppressing cover 31 may be integrally formed with therotary support 17A as a single member. Specifically, the rotationalresistance suppressing cover 31, thearm 19A as the appendage, and thebalance weight 28A are integrally formed with therotary support 17A. Such configuration allows the strength of thearm 19A to be easily increased and facilitates the manufacture of therotary support 17A. - The rotational
resistance suppressing cover 31 may have any structure as long as it covers steps, thereby reducing the steps. - The outer
peripheral surface 174 of therotary support 17 may be a conical plane of rotation or a plane of rotation created by rotation trajectory when a curve is rotated about therotation axis 141. - The outer
peripheral surface 321 of thering 32 may be a conical plane of rotation or a plane of rotation created by rotation trajectory when a curve is rotated about therotation axis 141. - The present examples and embodiments are to be considered as illustrative and not restrictive and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalence of the appended claims.
Claims (9)
1. A variable displacement compressor comprising a swash plate tiltably accommodated in a control pressure chamber, wherein refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled, the compressor comprising:
a rotary shaft having a rotation axis;
a rotary support that rotates integrally with the rotary shaft;
a link mechanism that links the swash platy to the rotary support such that the inclination angle of the swash plate is changeable, wherein the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate;
a first balance weight that is provided on the rotary support and corresponds to the link mechanism; and
a second balance weight that is provided on the swash plate and corresponds to the link mechanism,
wherein at least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a slope on a leading side in the rotation direction of the rotary shaft, the slope having a leading end in the rotation direction, and wherein the slope is shaped to descend in the direction of the rotation axes toward the leading end.
2. A variable displacement compressor comprising a swash plate tiltably accommodated in a control pressure chamber, wherein refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled, the compressor comprising:
a rotary shaft having a rotation axis;
a rotary support that rotates integrally with the rotary shaft;
a link mechanism that links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable, wherein the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate;
a first balance weight that is provided on the rotary support and corresponds to the link mechanism; and
a second balance weight that is provided on the swash plate and corresponds to the link mechanism,
wherein at least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a step on a leading side in the rotation direction of the rotary shaft, and the step is covered with a cover so as to suppress rotational resistance generated as the lubricant in the control pressure chamber is sheared by rotation of the rotary support or the swash plate.
3. The compressor according to claim 2 , wherein the rotational resistance suppressing cover as a ring that covers an outer periphery of the rotary support.
4. The compressor according to claim 3 , wherein an outer peripheral surface of the ring is a plane of rotation about the rotation axis.
5. The compressor according to claim 2 , wherein the rotational resistance suppressing cover is formed of a resin through insert molding.
6. The compressor according to claim 2 , wherein the rotational resistance suppression cover covers the outer peripheral surface of the rotary support such that an outer peripheral surfaces of the balance weights and the outer peripheral surface of the cover form a plane of rotation that is formed all around the rotation axis.
7. A variable displacement compressor comprising a swash plate tiltably accommodated in a control pressure chamber, wherein refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled, the compressor comprising:
a rotary shaft having a rotation axis;
a rotary support that rotates integrally with the rotary shaft; and
a link mechanism that links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable, wherein the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate,
wherein, when at least one of the rotary support and the swash plate is defined as a body of revolution, the body of revolution having, on a surface of a part of the body of revolution except a portion on which the appendage is formed, a plane of rotation that is formed all around the rotation axis, wherein a recess is formed in the plane of rotation, and wherein the recess is located on the same side as the appendage with respect to the axis.
8. The compressor according to claim 7 , wherein the rotary support has an opposed surface that is opposed to the swash plate, and the plane of rotation is a back surface that is on an opposite side of the opposed surface.
9. The compressor according to claim 1 , wherein the cuter peripheral surface of the rotary support is a plane of rotation about the rotation axis.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2007-062027 | 2007-03-12 | ||
JP2007062027 | 2007-03-12 | ||
JP2008059227A JP2008255985A (en) | 2007-03-12 | 2008-03-10 | Variable displacement compressor |
JP2008-059227 | 2008-03-10 |
Publications (1)
Publication Number | Publication Date |
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US20080226471A1 true US20080226471A1 (en) | 2008-09-18 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/046,154 Abandoned US20080226471A1 (en) | 2007-03-12 | 2008-03-11 | Variable displacement compressor |
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US (1) | US20080226471A1 (en) |
EP (1) | EP1970566A2 (en) |
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US20150125317A1 (en) * | 2013-11-06 | 2015-05-07 | Kabushiki Kaisha Toyota Jidoshokki | Swash plate type variable displacement compressor |
CN105863998A (en) * | 2016-06-03 | 2016-08-17 | 江苏盈科汽车空调有限公司 | Automobile air conditioner rotating arm |
CN106050611A (en) * | 2016-06-03 | 2016-10-26 | 江苏盈科汽车空调有限公司 | Bearing transmission mechanism of tilting tray of auto air-condition compressor |
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ITBO20090573A1 (en) | 2009-09-09 | 2011-03-10 | Ferrari Spa | HYBRID VEHICLE |
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JP4292539B2 (en) | 2003-07-02 | 2009-07-08 | 株式会社ヴァレオサーマルシステムズ | Compressor |
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- 2008-03-11 EP EP08004480A patent/EP1970566A2/en not_active Withdrawn
- 2008-03-11 US US12/046,154 patent/US20080226471A1/en not_active Abandoned
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150125317A1 (en) * | 2013-11-06 | 2015-05-07 | Kabushiki Kaisha Toyota Jidoshokki | Swash plate type variable displacement compressor |
US9752563B2 (en) * | 2013-11-06 | 2017-09-05 | Kabushiki Kaisha Toyota Jidoshokki | Swash plate type variable displacement compressor |
CN105863998A (en) * | 2016-06-03 | 2016-08-17 | 江苏盈科汽车空调有限公司 | Automobile air conditioner rotating arm |
CN106050611A (en) * | 2016-06-03 | 2016-10-26 | 江苏盈科汽车空调有限公司 | Bearing transmission mechanism of tilting tray of auto air-condition compressor |
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Legal Events
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Owner name: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YOKOMACHI, NAOYA;OKUDA, MOTOAKI;KAYUKAWA, HIROAKI;REEL/FRAME:021070/0440 Effective date: 20080331 |
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