JP2009221968A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight of a sleeve, and to reduce sliding resistance of the sleeve, in regard to a sleeve rotatably supported by a journal through a rotary support pin. <P>SOLUTION: This compressor includes a rotor fixed to a driving shaft 4, a journal 12 passing through the driving shaft 4 and connected to the rotor freely to swing, a swash plate inclined with the journal12 so as to reciprocate a piston with a stroke corresponding to an angle of inclination, and a sleeve 13 supported by the journal 12 freely to rotate and freely to slide in the axial direction of the driving shaft 4 so as to guide a change of the angle of inclination of the journal 12. The sleeve 13 is structured of a pair of divided sleeve bodies 30 arranged in opposite positions in the driving shaft 4 with an interval and supported by the journal 12 freely to rotate through a rotary support pin 30d. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a compressor that adjusts an inclination angle of a swash plate to change a stroke of a piston, thereby changing a discharge capacity of a refrigerant.

  A conventional compressor of this type is disclosed in Patent Document 1. As shown in FIG. 10, the compressor 100 includes a housing 101, and a crank chamber 102 and a plurality of cylinder bores 103 communicating with the crank chamber 102 are formed in the housing 101. A drive shaft 105 that passes through the crank chamber 102 is rotatably supported by the housing 101. A rotor 106 is fixed to the drive shaft 105. One end of a journal 108 is connected to the rotor 106 via a guide hole 106 a and a connecting pin 107. A through hole 108 a that penetrates the drive shaft 105 is provided at the center of the journal 108. A sleeve 109 slidably supported on the drive shaft 105 is disposed in the through hole 108a.

  The sleeve 109 and the journal 108 are rotatably connected via a rotation support pin 120. That is, the journal 108 swings while being guided by the sleeve 108 with the connecting pin 107 as a fulcrum within a range in which the connecting pin 107 can move through the guide hole 106a. Thereby, the inclination angle of the journal 108 and the swash plate 110 described below can be varied. A swash plate 110 is fixed to the outer periphery of the journal 108, and a plurality of pistons 112 are engaged with the swash plate 110 via a pair of shoes 111.

  In the above configuration, when the drive shaft 105 rotates, the journal 108 and the swash plate 110 rotate with the rotor 106 while swinging. By this swinging rotation of the swash plate 110, the piston 112 reciprocates in the cylinder bore 103, and the refrigerant is compressed. The inclination positions of the journal 108 and the swash plate 110 can be changed by the pressure of the crank chamber 102. When the inclination angle of the journal 108 and the swash plate 110 is changed, the stroke of the piston 112 is changed, thereby the refrigerant discharge capacity. Can be varied.

By the way, the sleeve 109 and the rotation support pin 120 are provided in order to prevent the rattling between the swinging journal 108 and the drive shaft 105 almost certainly and to prevent the generation of noise, vibration, etc. due to the rattling. Yes.
JP-A-11-125176

  However, the sleeve 109 of the conventional example has a through hole 109 a that penetrates the drive shaft 105 and is disposed over the entire outer periphery of the drive shaft 105. Therefore, the conventional sleeve 109 has a problem that it is heavy. Further, since the sleeve 109 slides on the entire outer peripheral surface of the drive shaft 105, there is a problem that the sliding resistance is large.

  A sleeve 109 that can rotate with respect to the journal 108 without using the rotation support pin 120 has also been proposed. The sleeve 109 having such a configuration can be reduced in weight by the weight of the rotation support pin 120 as a whole. is there. However, when the rotation support pin 120 is not used, the outer surface of the sleeve 109 and the inner surface of the journal 108 must be formed as spherical surfaces, and it is possible to reliably prevent backlash even when processed with extremely high accuracy. I can't.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a compressor that can be rotatably supported by a journal via a rotation support pin and can reduce the weight of the sleeve and reduce sliding resistance. .

  The invention according to claim 1, which achieves the above object, comprises a rotor fixed to a drive shaft, a journal penetrating the drive shaft and slidably connected to the rotor, and a stroke that is inclined together with the journal and that corresponds to the inclination angle. And a swash plate that reciprocates the piston, and a compressor that is slidable in the axial direction of the drive shaft and that is rotatably supported by the journal and guides the change in the inclination angle of the journal, The sleeve is composed of a pair of divided sleeve bodies that are arranged at positions facing each other of the drive shaft in a state of being spaced apart from each other, and are rotatably supported by the journal via rotation support pins. And

  A second aspect of the present invention is the compressor according to the first aspect, wherein each of the divided sleeve bodies is integrally provided with a rotation support pin.

  A third aspect of the present invention is the compressor according to the first or second aspect, wherein a flat surface perpendicular to the axial center line of the rotation support pin is provided on the outer surface of each divided sleeve body and the inner surface of the journal. The two flat surfaces are in contact with each other.

  According to a fourth aspect of the present invention, in the compressor according to the first or second aspect, the outer surface of each divided sleeve body and the inner surface of the journal are spherical surfaces having a center point passing through the axial center line of the rotation support pin. Are provided, and both spherical surfaces are in contact with each other.

  According to the first aspect of the present invention, since the pair of split sleeve bodies are not arranged over the entire outer periphery of the drive shaft, the weight can be reduced and the sliding area is small compared to the conventional sleeve. Therefore, in the sleeve that is rotatably supported by the journal via the rotation support pin, the sleeve can be reduced in weight and sliding resistance can be reduced.

  Further, since the sleeve and the journal are connected via the rotation support pin, it is possible to reliably prevent rattling.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the number of parts can be reduced as compared with the case where the divided sleeve body and the rotation support pin are configured as separate bodies, thereby managing parts, assembling work, etc. Is also easier.

  According to the invention of claim 3, in addition to the effects of the invention of claim 1 or claim 2, it is only necessary to create a flat surface on the outer surface of the split sleeve body and the inner surface of the journal, so that processing is easy.

  According to the invention of claim 4, in addition to the effects of the invention of claim 1 or 2, the rotation between the split sleeve body and the journal is guided by the rotation support pin and the rotation is also guided between the spherical surfaces. A more reliable guide can be performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(One embodiment)
1 to 4 show an embodiment of the present invention, FIG. 1 is an overall sectional view of a compressor, FIG. 2 is a perspective view of a sleeve and a drive shaft, and FIG. FIG. 4 is a cross-sectional view of a portion that guides the sleeve in a swingable manner.

  As shown in FIG. 1, the compressor 1 has a housing 2. The housing 2 is assembled with a cylinder block 2a, a front head 2b disposed on one side surface of the cylinder block 2a, and a rear head 2c disposed on the other side surface of the cylinder block 2a via a valve body 3. Is made up of.

  A drive shaft 4 is disposed in the cylinder block 2a and the front head 2b so as to penetrate a crank chamber 10 described below. Both ends of the drive shaft 4 are rotatably supported by the cylinder block 2a and the front head 2b via radial bearing portions 5 and 6. One end of the drive shaft 4 protrudes outward from the front head 2b, and a pulley 7 that receives engine rotation is fixed to the protruding portion. The drive shaft 4 is configured to rotate by receiving a driving force from the pulley 7 fixed to one end side in this way.

  A plurality of cylinder bores 8 are formed in the cylinder block 2a. The plurality of cylinder bores 8 are formed at equal intervals on the circumference around the drive shaft 4. A piston 9 is slidably disposed in each cylinder bore 8.

  A crank chamber 10 communicating with the plurality of cylinder bores 8 is formed in the front head 2b. The crank chamber 10 is provided with a rotor 11 fixed to the outer periphery of the drive shaft 4. One end of the journal 12 is connected to the rotor 11 through a guide hole 11 a and a connecting pin 19. A through hole 12 a that penetrates the drive shaft 4 is provided in the center of the journal 12. A sleeve 13 slidably supported on the drive shaft 4 is disposed in the through hole 12a. The detailed configuration of the sleeve 13 will be described below. That is, the journal 12 swings while being guided by the sleeve 13 with the connecting pin 19 as a fulcrum within a range in which the connecting pin 19 can move through the guide hole 11a. Thereby, the inclination angle of the journal 12 can be varied. A swash plate 15 is fixed to the outer periphery of the journal 12. The rear end side of each piston 9 is engaged with the outer peripheral portion of the swash plate 15 via a pair of shoes 16.

  A spring S <b> 1 is disposed on one end side of the sleeve 13. Due to the spring force of the spring S1, the swash plate 15 is returned to the initial driving position after the operation is stopped.

  When the drive shaft 4 rotates, the rotation is transmitted to the swash plate 15 by the rotor 11 and the journal 12, and each piston 9 reciprocates in the cylinder bore 8. Further, the stroke of each piston 9 is varied depending on the inclination angle of the swash plate 15, and the discharge capacity of the refrigerant is varied. The mechanism by which the inclination angle of the swash plate 15 is adjusted will be described in the place of action.

  A refrigerant gas suction chamber 20 and a discharge chamber 21 are formed in the rear head 2c. The suction chamber 20 is connected to the outlet side of the evaporator of the refrigeration cycle. The discharge chamber 21 is connected to the inlet side of the condenser of the refrigeration cycle. The suction chamber 20 and the discharge chamber 21 are partitioned by the cylinder bores 8 via the valve bodies 3. A suction hole (not shown) with a suction valve and a discharge hole 22 with a discharge valve are formed in the valve body 3 partitioning both chambers.

  In addition, a bleed passage (not shown) that is in continuous communication is formed between the crank chamber 10 and the suction chamber 20. An air supply passage 23 is formed between the crank chamber 10 and the discharge chamber 21. A pressure control valve 24 is disposed in the air supply passage 23. The pressure of the crank chamber 10 can be adjusted by controlling the opening of the pressure control valve 24.

  Next, the configuration of the sleeve 13 will be described. As shown in FIGS. 2 to 4, the sleeve 13 is composed of a pair of split sleeve bodies 30. The pair of split sleeve bodies 30 are disposed at positions facing each other on the drive shaft 4 in a state of being spaced apart from each other. That is, the pair of split sleeve bodies 30 are not arranged over the entire circumference of the drive shaft 4 as a whole. The inner surface of each divided sleeve body 30 is formed as a concave circumferential surface 30a, and is in contact with the outer circumferential surface of the drive shaft 4 over the entire circumferential surface 30a. Each divided sleeve body 30 has an outer surface formed on a spherical surface 30b and a flat surface 30c protruding from the spherical surface 30b, and a rotation support pin 30d is integrally formed at the center of the flat surface 30c. The flat surface 30c is formed in a direction orthogonal to the axial center line of the rotation support pin 30d.

  The journal 12 is formed with a pin insertion hole 12b that opens on the inner surface of the through hole 12a, and a rotation support pin 30d is inserted into the pin insertion hole 12b. The journal 12 is rotatably supported via the rotation support pin 30d. A flat surface 12c is formed on the inner surface of the through hole 12a of the journal 12 and around the pin insertion hole 12b. The flat surface 12c is formed in a direction perpendicular to the axial center line of the rotation support pin 30d. The flat surface 30c of the sleeve 13 is in contact.

  In the above configuration, when the drive shaft 4 rotates, the rotational force causes the swash plate 15 to rotate, and the plurality of pistons 9 reciprocate in the cylinder bore 8. In the suction stroke of the piston 9 (stroke moving from the top dead center to the bottom dead center), a suction hole (not shown) is opened by the pressure reduction in the cylinder bore 8. As a result, the refrigerant gas is supplied from the suction chamber 20 to the cylinder bore 8.

  In the compression stroke of the piston 9 (stroke moving from the bottom dead center to the top dead center), the suction hole (not shown) is closed, and the refrigerant gas in the cylinder bore 8 is adiabatically compressed by the piston 9. The compressed high-temperature and high-pressure refrigerant gas is discharged from the discharge hole 22 to the discharge chamber 21. The high-temperature and high-pressure refrigerant discharged into the discharge chamber 21 is discharged out of the compressor 1 through a discharge port (not shown). The discharged refrigerant circulates in the refrigeration cycle, is used for cooling or the like, and returns to the compressor 1 again.

  When the compressor 1 is driven and the heat load of the refrigeration cycle increases, the pressure in the crank chamber 10 is adjusted to the low pressure side. As a result, the balance between the counterclockwise moment caused by the crank chamber pressure, which is the back pressure of each piston 9 and the spring force of the spring S1, and the clockwise moment caused by the front pressure of each piston 9 are lost, and the swash plate 15 and journal 12 are integrated. On the other hand, the clockwise moment in the direction of increasing the inclination angle of the swash plate 15 around the connecting pin 19 is increased, the inclination position is changed to a position where both moments are balanced, and the inclination angle of the swash plate 15 is increased. When the inclination angle of the swash plate 15 increases, the reciprocating stroke of each piston 9 increases, the refrigerant discharge capacity increases, and the cooling capacity and the like increase.

  Further, when the heat load of the refrigeration cycle is reduced, the pressure in the crank chamber 10 is adjusted to the high pressure side. As a result, the balance between the counterclockwise moment caused by the crank chamber pressure, which is the back pressure of each piston 9 and the spring force of the spring S1, and the clockwise moment caused by the front pressure of each piston 9 are lost, and the swash plate 15 and journal 12 are integrated. On the other hand, the counterclockwise moment in the direction of decreasing the inclination angle of the swash plate 15 around the connecting pin 19 is increased, the inclination angle is varied to a position where both moments are balanced, and the inclination angle of the swash plate 15 is reduced. . When the inclination angle of the swash plate 15 is reduced, the reciprocating stroke of each piston 9 is reduced, the refrigerant discharge capacity is reduced, and the cooling capacity and the like are reduced. The compressor 1 can save power by such operation.

  In the operation process of the compressor 1 described above, during the movement for changing the inclination angle of the swash plate 15, the pair of split sleeve bodies 30 slide on the outer peripheral surface of the drive shaft 4 and the rotational position of the journal 12 is adjusted. By guiding while varying, the inclination angle of the journal 12 is varied.

  The sleeves 13 that perform such an operation are disposed at positions facing each other of the drive shaft 4 in a state of being spaced apart from each other, and are also rotatably supported by the journal 12 via the rotation support pins 30d. The divided sleeve body 30 is configured. Therefore, since the pair of split sleeve bodies 30 are not arranged over the entire outer periphery of the drive shaft 4, the weight can be reduced as compared with the conventional sleeve, and the sliding area is also small. Therefore, in the sleeve 13 rotatably supported by the journal 12 via the rotation support pin 30d, the sleeve 13 can be reduced in weight and sliding resistance can be reduced. Further, since the sleeve 13 and the journal 12 are connected via the rotation support pin 30d, there is almost no backlash, and there is no abnormal noise or vibration due to the backlash.

  In this embodiment, each divided sleeve body 30 is integrally provided with a rotation support pin 30d. Therefore, the number of parts can be reduced as compared with the case where the split sleeve body 30 and the rotation support pin 30d are configured as separate bodies, thereby facilitating parts management, assembly work, and the like.

  In this embodiment, flat surfaces 30c and 12c perpendicular to the axial center line of the rotation support pin 30d are provided on the outer surface of each divided sleeve body 30 and the inner surface of the journal 12, respectively. It is in contact. Therefore, the flat surfaces 30c and 12c need only be created on the outer surface of the split sleeve body 30 and the inner surface of the journal 12, so that processing is easy.

(First variation of sleeve)
5 to 7 show a first modified example of the sleeve, FIG. 5 is a perspective view of the sleeve and the drive shaft, FIG. 6 is a perspective view of a main part of a portion that guides the sleeve to be swingable, and FIG. It is sectional drawing of the location which guides so that rocking is possible.

  As shown in FIG. 5 to FIG. 7, the sleeve 13A of the first modified example is composed of a pair of split sleeve bodies 30A as in the above embodiment, but the configuration of each split sleeve body 30A is slightly different. . That is, the split sleeve body 30A of the first modification is not provided with a rotation support pin integrally as compared with that of the above-described embodiment, and a pin insertion hole 30e is formed instead. In this first modification, a pair of rotation support pins 31 are provided separately from the divided sleeve body 30A, and each rotation support pin 31 is inserted into each divided sleeve body 30A and the pin insertion holes 30e, 12b of the journal 12. Has been.

  Since other configurations are the same as those of the above-described embodiment, the same reference numerals are given to the same components in the drawings, and description thereof will be omitted.

(Second modification of sleeve)
FIG. 8 is a perspective view of the sleeve and the drive shaft of the second modified example. The sleeve 13B of the second modified example is composed of a pair of split sleeve bodies 30B as in the above embodiment, but the configuration of each split sleeve body 30B is slightly different. In other words, the split sleeve body 30B of the second modification example is not provided with a flat surface as compared with that of the above embodiment, and the outer surface is formed only of the spherical surface 30b, and the rotation support pin is formed at the center of the spherical surface 30b. 30d is protruded.

  The inner surface of the through hole of the journal (not shown) is also formed as a spherical surface (not shown) corresponding to the spherical surface 30b, and both the outer surface of each divided sleeve body 30B and the inner surface of the journal (not shown) are both. The spherical surfaces 30b (not shown) are in contact with each other.

  Since other configurations are the same as those of the above-described embodiment, the same reference numerals are given to the same components in the drawings, and description thereof will be omitted.

  In the second modified example, rotation between the split sleeve body 30B and the journal is guided by the rotation support pin 30d and rotation is also guided between the spherical surfaces 30b (not shown), so that more reliable guide is performed. Can do.

  In the second modified example, each divided sleeve body 30B is integrally provided with a rotation support pin 30d. Therefore, the number of parts can be reduced as compared with the case where the split sleeve body 30 and the rotation support pin 30d are configured as separate bodies, thereby facilitating parts management, assembly work, and the like.

(Third modification of sleeve)
FIG. 9 is a perspective view of a sleeve and a drive shaft according to a third modification. The sleeve 13C of the third modified example is composed of a pair of divided sleeve bodies 30C as in the second modified example, but the configuration of each divided sleeve body 30C is slightly different. That is, the split sleeve body 30C of the third modification example is not provided with the rotation support pin 30d as compared with that of the second modification example, and a pin insertion hole 30e is formed instead. In the third modification, as in the first modification, a pair of rotation support pins 31 are provided separately from the division sleeve body 30C, and each rotation support pin 31 is connected to each division sleeve body 30C and a journal ( (Not shown) is inserted into a pin insertion hole 30e (not shown).

  Since other configurations are the same as those of the above-described embodiment, the same reference numerals are given to the same components in the drawings, and description thereof will be omitted.

  Also in the third modified example, the rotation is guided by the rotation support pin 31 between the split sleeve body 30C and the journal (not shown) and the rotation is also guided between the spherical surfaces 30b (not shown). Can guide you.

1 is an overall cross-sectional view of a compressor according to an embodiment of the present invention. 1 is a perspective view of a sleeve and a drive shaft according to an embodiment of the present invention. FIG. 3 is a perspective view of a main part of a portion that guides a sleeve in a swingable manner according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a portion that guides a sleeve in a swingable manner according to an embodiment of the present invention. It is a perspective view of the sleeve and drive shaft of a 1st modification. It is a principal part perspective view of the location which guides the sleeve of a 1st modification so that rocking is possible. It is sectional drawing of the location which guides the sleeve of a 1st modification so that rocking | fluctuation is possible. It is a perspective view of the sleeve and drive shaft of a 2nd modification. It is a perspective view of the sleeve and drive shaft of a 3rd modification. It is whole sectional drawing of the compressor of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 4 Drive shaft 9 Piston 11 Rotor 12 Journal 12c Flat surface 13, 13A-13C Sleeve 15 Swash plate 30, 30A-13C Split sleeve body 30b Spherical surface 30c Flat surface 31 Rotation support pin

Claims (4)

Together with the rotor (11) fixed to the drive shaft (4), the journal (12) penetrating through the drive shaft (4) and pivotably connected to the rotor (11), and the journal (12) A swash plate (15) that is inclined and reciprocates the piston (9) with a stroke corresponding to the inclination angle, and is slidable in the axial direction of the drive shaft (4) and is rotatable about the journal (12). A compressor (1) comprising a sleeve (13) that is supported by the sleeve and guides a change in the inclination angle of the journal (12),
The sleeve (13) is disposed at a position facing the drive shaft (4) in a state of being spaced apart from each other, and is connected to the journal (12) via rotation support pins (30d) and (31). A compressor (1) comprising a pair of divided sleeve bodies (30), (30A), (30B), and (30C) that are rotatably supported. Compressor (1) according to claim 1,
The compressor (1), wherein each of the divided sleeve bodies (30), (30A) is integrally provided with the rotation support pin (30d). A compressor (1) according to claim 1 or claim 2,
On the outer surface of each of the divided sleeve bodies (30) and (30A) and the inner surface of the journal (12), flat surfaces (30c) and (30c) orthogonal to the axial center line of the rotation support pins (30d) and (31). Compressor (1) characterized in that each of the flat surfaces (30c) and (12c) is in contact with each other. A compressor (1) according to claim 1 or claim 2,
On the outer surface of each of the divided sleeve bodies (30B, (30C) and the inner surface of the journal (12), a spherical surface (30b) centering on a center point passing through the axial center line of the rotation support pins (30d), (31). ), And the both spherical surfaces (30b) are in contact with each other.

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