JP2009185783A - Swash plate type variable displacement compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swash plate type variable displacement compressor suppressing hunting of a swash plate swingably provided to a drive shaft. <P>SOLUTION: This swash plate type variable displacement compressor is provided with: an external force generating means 22 exerting external force for changing the inclination direction of the swash plate 8; a hunting detection means 23 detecting the hunting of the swash plate 8; and a control section 24 controlling drive of the external force generating means 22 based on hunting detection information from the hunting detection means 23. The external force generating means 22 has: a resistor 34 arranged on the inner surface of a swing hole 8a of the swash plate 8 and inserted into the recessed portion 5a of the drive shaft 5; a rolling element 35 interposed between the resistor 34 and the surface of a recessed portion 5a of the drive shaft 5; and a solenoid valve shaft 32 connected to the resistor 34, passing through the inside of the drive shaft 5, and axially moved by electromagnetic force of the solenoid valve 31. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a swash plate type variable displacement compressor used for compressing refrigerant gas in a refrigeration cycle such as a vehicle air conditioner.

  As this type of prior art, there is a swash plate type variable displacement compressor disclosed in Patent Document 1.

  As shown in FIG. 5, this conventional swash plate type variable displacement compressor is joined to a substantially cylindrical cylinder block 2 having a plurality of cylinder bores 1 and a front end face of the cylinder block 2, and a crank chamber 3 is provided therein. The front housing 4 is formed in the crank chamber 3 of the front housing 4. The rotor 6 is driven by the drive shaft 5 and is swingable with respect to the drive shaft 5. A swash plate 8 connected to the rotor 6, and a drive plate 11 provided on the swash plate 8 so as to be relatively rotatable and reciprocating in the cylinder bore 1 and connected via a rod 10. ing. A rear housing 14 that forms a suction chamber 12 and a discharge chamber 13 is joined to the rear end side of the cylinder block 2 via a valve body 15. The swash plate 8 has a rocking hole 8a through which the drive shaft 5 is inserted, and is formed in a substantially annular shape.

In the above configuration, the inclination angles of the swash plate 8 and the drive plate 11 are maintained at a position where the pressure acting on the piston 9 from the crank chamber 3 side and the pressure acting from the opposite side (refrigerant suction pressure) are balanced. Be drunk. Then, by adjusting the pressure in the crank chamber 3, the inclination angle of the swash plate 8 and the drive plate 11 changes while the swash plate 8 slides on the drive shaft 5 by the guidance of the hinge mechanism 7. As a result, the amount of refrigerant discharged from the cylinder block 2 increases or decreases.
JP 2007-192085 A

  However, in the prior art described in Patent Document 1 described above, the swash plate 8 is swung by the pressure acting on the piston 9 from the crank chamber 3 side or from the opposite side, whereby the swash plate 8 is hunted. As a result, since the operating torque of the compressor fluctuates, there is a problem that the load torque applied to the drive source (engine) becomes unstable.

  In particular, when the rotor 6 and the swash plate 8 are connected by the ball 16 and the long hole groove 17 and only the rolling resistance is generated at this connecting portion and the sliding resistance when the swash plate 8 swings is small, the piston 9 While the responsiveness of the swash plate 8 to the applied pressure fluctuation is improved, since the swash plate 8 is swung by a relatively small pressure fluctuation in the crank chamber 3, the tendency of the above hunting to occur is remarkable.

  The present invention has been made in consideration of the above-described prior art, and an object of the present invention is to swash plate type variable displacement compression capable of suppressing hunting of a swash plate provided to be swingable with respect to a drive shaft. Is to provide a machine.

  In order to achieve the above object, a first aspect of the present invention provides a substantially cylindrical cylinder block having a plurality of cylinder bores, and a front which is joined to the front end surface of the cylinder block and forms a crank chamber with the cylinder block. And a rotor that is driven by a drive shaft in a crank chamber of the front housing; a swash plate that is swingable with respect to the drive shaft and connected to the rotor; and a relative to the swash plate A swash plate type variable displacement type, comprising a drive plate that is rotatably provided and to which a plurality of pistons that reciprocate in the cylinder bore are coupled, and that changes a stroke amount of the piston by changing an inclination angle of the swash plate In the compressor, external force generating means for applying an external force for changing the inclination direction of the swash plate, and hunting for detecting hunting of the swash plate A knowledge unit, characterized in that a control unit for controlling the driving of the external force generating means based on the hunting detection information of the hunting detection means.

  A second aspect of the present invention is the swash plate type variable displacement compressor according to the first aspect, wherein the external force generating means is disposed on an inner surface of the swinging hole of the swash plate and is provided in a recess of the drive shaft. An inserted resistor, a rolling element interposed between the resistor and the concave surface of the drive shaft, and the resistor are coupled to the resistor and pass through the inside of the drive shaft. And an electromagnetic valve shaft that moves in the axial direction by force.

  According to the first aspect of the present invention, when the hunting of the swash plate occurs for some reason and the hunting detection means detects this, the controller controls the driving of the external force generation means based on the hunting detection information of the hunting detection means. At the same time, since an external force that changes the inclination direction of the swash plate is applied by the external force generating means, hunting of the swash plate can be suppressed. Thereby, since the operating torque fluctuation of the compressor can be reduced, the load torque applied to the drive source can be stabilized.

  According to the invention of claim 2, the resistor is in contact with the surface of the concave portion of the drive shaft via the rolling element, and the resistor is always in contact with the swash plate to align the swash plate and the drive shaft. By doing so, the clearance between the swash plate and the drive shaft is absorbed, so even when a large vibration is applied from the outside, such as when the swash plate is at the minimum tilt, the swash plate rattles and collides with other members. This can be prevented, and the generation of noise and vibration and the wear of the collision part can be suppressed. In addition, since the resistor is in contact with the concave surface of the drive shaft via the rolling element, the swash plate can swing with respect to the drive shaft, and the inclination angle of the swash plate can be controlled smoothly. .

  Hereinafter, a swash plate type variable displacement compressor according to an embodiment of the present invention will be described with reference to the drawings.

  1 to 4 show an embodiment of the present invention, FIG. 1 is a view showing a swash plate type variable displacement compressor, FIG. 2 is an exploded perspective view showing an external force generating means, and FIG. 3 is an operation of the external force generating means. FIG. 4 is a sectional view showing the swash plate and the drive shaft. The swash plate type variable displacement compressor 1 according to the present embodiment includes the same components as those of the conventional example shown in FIG. Therefore, the same components are denoted by common reference numerals, and redundant description is omitted.

  The swash plate type variable displacement compressor 21 to which the present invention is applied includes an external force generating means 22 that applies an external force that changes the inclination direction of the swash plate 8, a hunting detection means 23 that detects hunting of the swash plate 8, And a control unit 24 for controlling the driving of the external force generation means 22 based on the hunting detection information of the hunting detection means 23, and the rest of the configuration is the same as the conventional example shown in FIG.

  The external force generating means 22 includes an electromagnetic valve 31 provided on the rear end side of the drive shaft 5, an electromagnetic valve shaft 32 that passes through the inside of the drive shaft 5 and moves in the axial direction by the electromagnetic force of the electromagnetic valve 31, and the electromagnetic valve A resistor 34 connected to the valve shaft 32 via a connecting link 33 and inserted into the recess 5a of the drive shaft 5, and a rolling element interposed between the resistor 34 and the surface of the recess 5a of the drive shaft 5, such as a hard ball 35.

  The drive shaft 5 has a recess 5a in which the resistor 34 and the hard ball 35 are accommodated, and a through hole 5b through which the solenoid valve shaft 32 penetrates in the axial direction, and the recess 5a and the through hole 5b are provided. Communicate.

  The resistor 34 has a bottom portion disposed on the inner surface of the swinging hole 8 a of the swash plate 8, and a V-shaped groove 34 a that receives the hard ball 35 is formed on the upper portion. That is, in a state where the hard ball 35 is received in the V-shaped groove 34 a of the resistor 34, the hard ball 35 is in contact with the surface of the concave portion 5 a of the drive shaft 5.

  The hunting detection means 23 includes a temperature sensor that detects the temperature of air that has passed through an evaporator (not shown), a pressure sensor that detects the refrigerant pressure on the high-pressure side of the refrigeration cycle (the refrigerant discharge side of the compressor 1), and the like. Alternatively, stroke detecting means attached to the solenoid valve 31 itself and directly detecting the movement of the solenoid valve shaft 32 may be used.

  In this embodiment, since the swash plate 8 is provided so as to be swingable with respect to the drive shaft 5, as shown in FIG. 4, the inner diameter A of the swing hole 8a of the swash plate 8 is set in the axial direction. It is the smallest at the center of the tube and gradually increases as it goes toward both axial ends. Further, since the outer diameter D of the drive shaft 5 is set smaller than the inner diameter A of the central portion of the swing hole 8a, the outer peripheral surface of the drive shaft 5 and the inner peripheral surface of the central portion of the swing hole 8a. There is clearance between them. Therefore, the resistor 34 abuts against the surface of the recess 5a of the drive shaft 5 via the hard ball 35, and the resistor 34 always contacts the swash plate 8 to align the swash plate 8 and the drive shaft 5. By doing so, the clearance between the outer peripheral surface of the drive shaft 5 and the inner peripheral surface of the central portion of the swinging hole 8a is absorbed. Further, the resistor 34 is in contact with the surface of the recess 5 a of the drive shaft 5 via the hard ball 35, that is, the hard ball 35 is substantially in point contact with the surface of the recess 5 a, so that the swash plate 8 contacts the drive shaft 5. On the other hand, it can be swung, and the inclination angle of the swash plate 8 can be controlled smoothly.

  As shown in FIGS. 1 and 3 (a), when the swash plate 8 is tilted to the maximum, the solenoid valve shaft 32 is pressed in the direction of the resistor 34 (direction of arrow A1 in FIG. 3 (a)) by driving the solenoid valve 31. Therefore, the resistor 34 is pressed in the direction in which the inclination angle of the swash plate 8 increases (the direction of the arrow A2 in FIG. 3A), and as a result, the maximum inclination state of the swash plate 8 is maintained.

  As shown in FIG. 3B, when the swash plate 8 is at the minimum inclination, the solenoid valve shaft 32 is pulled in the direction of the solenoid valve 31 (the direction of the arrow A3 in FIG. 3B) by driving the solenoid valve 31. The resistor 34 is pressed in the direction in which the inclination angle of the swash plate 8 becomes smaller (the direction of the arrow A4 in FIG. 3B), and as a result, the minimum inclination state of the swash plate 8 is maintained.

  Also, as shown in FIG. 3C, when the inclination angle of the swash plate 8 is controlled by the pressure acting on the piston 9 from the crank chamber 3 side and the opposite side, hunting of the swash plate 8 occurs for some reason, When this is detected by the hunting detection means 23, the controller 24 controls the driving of the external force generation means 22 based on the hunting detection information of the hunting detection means 23, so that the external force generation means 22 changes the inclination direction of the swash plate 8. External force is applied. Specifically, the resistor 34 is pressed or pulled by the electromagnetic valve shaft 32 via the connecting link 33 by driving the electromagnetic valve 31 according to the hunting detection information of the hunting detection means 23, so that the inclination angle of the swash plate 8 is increased. Adjusted.

  In this embodiment configured as described above, when hunting of the swash plate 8 occurs for some reason, an external force that cancels the hunting is applied to the swash plate 8 by the external force generating means 22. Can be suppressed. As a result, the operating torque fluctuation of the compressor 1 can be reduced, so that the load torque applied to the drive source can be stabilized.

  In this embodiment, the resistor 34 always contacts the swash plate 8 to align the swash plate 8 and the drive shaft 5, thereby absorbing the clearance between the swash plate 8 and the drive shaft 5. Therefore, even when a large vibration is applied from the outside at the time of the minimum inclination of the swash plate 8, it is possible to prevent the swash plate 8 from rattling and colliding with other members, generating noise and vibration, In addition, wear at the collision site can be suppressed.

It is a figure which shows one Embodiment of this invention and shows a swash plate type | mold variable capacity type compressor. 1 is an exploded perspective view showing an external force generating means according to an embodiment of the present invention. FIG. 5 is an assembled cross-sectional view showing an operation of the external force generating means according to the embodiment of the present invention. It is sectional drawing which shows one Embodiment of this invention and shows a swash plate and a drive shaft. It is sectional drawing which shows the conventional swash plate type variable displacement compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder bore 2 Cylinder block 3 Crank chamber 4 Front housing 5 Drive shaft 5a Recessed part 5b Through hole 6 Rotor 8 Swash plate 8a Swing hole 9 Piston 21 Swash plate type variable capacity compressor 22 External force generating means 23 Hunting detection means 24 Control part 31 Solenoid valve 32 Solenoid valve shaft 33 Connecting link 34 Resistor 34a V-shaped groove 35 Hard ball (rolling element)

Claims (2)

A substantially cylindrical cylinder block (2) having a plurality of cylinder bores (1) and a front housing (4) joined to the front end surface of the cylinder block (2) and forming a crank chamber (3) therein In the crank chamber (3) of the front housing (4), the rotor (6) driven by the drive shaft (5) and the rotor (6) are provided so as to be swingable with respect to the drive shaft (5). 6) and a drive plate (8) connected to a plurality of pistons (9) reciprocatingly provided in the cylinder bore (1). The swash plate (8) is connected to the swash plate (8). 11), and a swash plate type variable displacement compressor (21) that changes the stroke amount of the piston (9) by changing the inclination angle of the swash plate (8),
External force generating means (22) for applying an external force for changing the inclination direction of the swash plate (8), hunting detection means (23) for detecting hunting of the swash plate (8), and this hunting detection means (23) And a controller (24) for controlling the driving of the external force generating means (22) based on the hunting detection information of the swash plate type variable displacement compressor (21). A swash plate type variable displacement compressor (21) according to claim 1,
The external force generating means (22) is disposed on the inner surface of the swing hole (8a) of the swash plate (8) and is inserted into the recess (5a) of the drive shaft (5). The resistor (34), the rolling element (35) interposed in the surface of the recess (5a) of the drive shaft (5), the resistor (34) and the drive shaft (5). And a solenoid valve shaft (32) that moves in the axial direction by the electromagnetic force of the solenoid valve (31). The swash plate variable displacement compressor (21).

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