JP2007177650A - Displacement detecting device for variable displacement type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement detecting device for a variable displacement type compressor accurately, which detects a swash plate angle. <P>SOLUTION: In the variable displacement compressor, a piston 28 provided in a housing 11 is connected to a swash plate 22 via a shoe 29; a sliding part slidingly contacting the shoe 29 of the swash plate 22 is rotatably provided synchronizing with the rotation of a drive shaft 17; and the inclination angle of the swash plate 22 that performs an oscillating movement in the axial direction of the drive shaft 17 while synchronizingly rotating with the drive shaft 17 accompanying the rotation of the drive shaft 17 is controlled to change the stroke of the piston 28. The variable displacement compressor is provided with a magnet 35 as a detection object on the outer peripheral part R of the swash plate 22, and a magnetic sensor 36 as a detector is provided in the housing 11 to oppose the magnet 35. The magnet 35 passes an intersection of a line connecting a top dead center position P and a bottom dead center position Q of the swash plate 22, and an axial line m of the drive shaft 17, and is provided on an outer peripheral part R of the swash plate 22 where a face perpendicular to the line connecting the top dead center position P and the bottom dead center position Q of the swash plate 22 crosses. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to capacity detection of a variable capacity compressor used in, for example, vehicle air conditioning equipment.

In general, a variable capacity compressor (hereinafter simply referred to as “compressor”) capable of variably controlling a discharge capacity is known as a compressor used in a vehicle air conditioner or the like.
In this type of compressor, a swash plate that can be inclined with respect to a drive shaft is housed in a crank chamber. As the crank chamber pressure increases, the swash plate approaches a right angle to the axis of the drive shaft (the inclination angle of the swash plate decreases). On the other hand, when the crank chamber pressure decreases, the axis of the drive shaft The swash plate is inclined so as to approach (the inclination angle of the swash plate increases).
The stroke of the piston provided in the compressor changes according to the inclination state of the swash plate. For example, when the crank chamber pressure is high and the tilt angle of the swash plate is small, the piston stroke is small. Conversely, when the crank chamber pressure is low and the tilt angle of the swash plate is large, the piston stroke is large. . Therefore, the discharge capacity decreases as the piston stroke decreases, and the discharge capacity increases as the stroke increases.

  In the prior art disclosed in Patent Document 1, a wobble compressor is disclosed, and a drive shaft 7 is rotatably supported in the crank chamber 6, and a rotation holding member 28 is fitted to the drive shaft 7, A rocking plate mounting member 27 is linked to the rotation holding member 28. The swing plate mounting member 27 is attached to the drive shaft 7 via a hinge ball 33, and the swing plate mounting member 27 can rotate while swinging in the axial direction as the drive shaft 7 rotates. . A swing plate 41 is supported on the swing plate mounting member 27 via a bearing so as to be relatively rotatable. The swing plate mounting member 27 swings with the piston 9 in the cylinder 8 provided around the drive shaft 7 in the cylinder block 2. The moving plate 41 is rotatably connected by a piston rod 49. Accordingly, the rotational movement of the drive shaft 7 is converted into the reciprocating rocking movement in the axial direction of the rocking plate 41 via the rocking plate mounting member 27, whereby the piston 9 reciprocates and slides in the cylinder 8. Gas suction and compression are performed.

A pin 45 (magnet) as a detection object is fixed to a predetermined position on the outer peripheral edge of the swing plate 41 so as to protrude in the outer peripheral direction, and the swing plate 41 on the outer peripheral surface of the housing 1 swings. The electromagnetic induction type detector 48 is arranged with its detecting part 48a facing the center position of the swinging movement locus line of the pin 45 at the passing position of the pin 45 at the time of the minimum inclination angle of the swinging plate 41. It is installed. The electromagnetic induction type detector 48 detects a change in magnetic flux and generates a signal pulse each time the pin 45 passes through the detection unit 48a. This signal pulse is transmitted to the control unit 19 connected to the electromagnetic induction type detector 48, and the control unit 19 has a pin 45 on the left side of the detection part 48a of the electromagnetic induction type detector 48 from the input signal pulse. The time and the time existing on the right side are detected. Then, by utilizing the fact that the sum of the detected left and right existence times, that is, the ratio of the existence time of one of the left and right with respect to the time of one oscillation cycle varies depending on the capacity change of the compressor, the inclination of the oscillation plate 41 Calculate the angle, and hence the discharge capacity of the compressor.
JP-A-62-218670 (pages 2-5, FIG. 1)

  However, in a swash plate type compressor in which the sliding portion of the swash plate that connects the piston and the swash plate through the shoe and is in sliding contact with the shoe rotates synchronously with the rotation of the drive shaft, a signal pulse is generated for each rotation of the drive shaft. Since generation | occurrence | production of this will be 1 time, the technique disclosed by the said patent document 1 cannot be employ | adopted. If the capacity is to be detected in this type of swash plate compressor, the object to be detected is provided on the outer periphery of the swash plate and a plurality of detectors are provided in the housing or one detector is provided in the housing. A method of reading the position of the swash plate by changing the magnetic flux according to the distance between the object and the object to be detected is conceivable.

  However, when the object to be detected is arranged near the top dead center position or the bottom dead center position of the swash plate, the change in the axial distance between the object to be detected and the detector is caused by the inclination angle of the swash plate. In addition, the radial distance around the axis center perpendicular to it changes. For this reason, in order to enable detection over a wide range from the minimum inclination angle position to the maximum inclination angle position of the swash plate, it is necessary to increase the detection output of the detector or increase the magnetic force of the detected object. There is a problem that it is necessary to correct the distance of the detection output by the inclination angle of the swash plate.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a variable displacement compressor capable of accurately detecting a swash plate angle.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a piston provided in a housing and a swash plate are connected via a shoe, and a sliding portion that is in sliding contact with the shoe of the swash plate is provided with a drive shaft. The rotation angle of the swash plate that swings in the axial direction of the drive shaft is controlled while rotating synchronously with the drive shaft as the drive shaft rotates, In the variable capacity compressor configured to change the stroke of the piston, a detected body provided on an outer peripheral portion of the swash plate, and a detector provided in the housing facing the detected body. The detected object passes through the intersection of a line connecting the top dead center position and bottom dead center position of the swash plate and the axis of the drive shaft, and the top dead center position and bottom dead center of the swash plate It is provided on the outer periphery of the swash plate where the plane perpendicular to the line connecting the point positions intersects. The features.
According to the first aspect of the present invention, the detected object passes through the intersection of the line connecting the top dead center position and the bottom dead center position of the swash plate and the axis of the drive shaft, and the top dead center position of the swash plate Since the surface perpendicular to the line connecting the bottom dead center positions is provided at the outer periphery of the swash plate, the object to be detected is only displaced in the axial direction even if the inclination angle of the swash plate changes. As for the distance between the detector provided on the detector and the object to be detected, the distance in the axial direction changes, but the distance in the radial direction perpendicular thereto does not change. Therefore, the detector can detect the inclination angle of the swash plate with high accuracy by detecting the displacement in the axial direction of the detected object accompanying the change in the inclination angle of the swash plate. In order to cope with a change in the distance in both the axial direction and the radial direction, the detection output of the detector or the detected object is not increased, and complicated adjustment such as distance correction is not required, so that the adjustment can be simplified.

According to a second aspect of the present invention, in the capacity detection device for a variable displacement compressor according to the first aspect, the detector is disposed in a region from the minimum inclination angle position of the swash plate to the maximum inclination angle position. It is characterized by that.
According to the second aspect of the present invention, the detector is disposed in a region from the minimum inclination angle position of the swash plate to the maximum inclination angle position. When the detected object is displaced in the axial direction, it can be detected by the detector closest to the displaced detected object, and the inclination angle of the swash plate can be detected with higher accuracy.

According to a third aspect of the present invention, in the capacity detection device for a variable capacity compressor according to the first or second aspect, the detected object is a magnet, the detector is a magnetic sensor, and the magnetic sensor is the axis. A plurality of them are arranged on the peripheral wall of the housing in parallel with the line.
According to the third aspect of the present invention, since the magnet and the magnetic sensor are used, the handling is easy, and since it is only necessary to fix to the peripheral wall of the housing, the mounting is simple.

  According to this invention, the swash plate angle can be detected with high accuracy without requiring complicated adjustment by devising the mounting position of the detected object on the swash plate.

(First embodiment)
Hereinafter, a capacity detection device of a variable capacity compressor (hereinafter simply referred to as “compressor”) according to a first embodiment will be described with reference to FIGS.
The compressor 10 shown in FIG. 1 includes a housing 11 that is an outer shell of the compressor 10. The housing 11 includes a cylinder block 12 having a plurality of cylinder bores 12 a and a cylinder block 12. The front housing 13 is joined to the front side, and the rear housing 14 is joined to the rear side of the cylinder block 12.
The front housing 13, the cylinder block 12, and the rear housing 14 are integrally fixed by fastening the through bolts 15 passed from the front housing 13 to the rear housing 14 in the front-rear direction, and the housing 11 is formed.

A crank chamber 16 is formed in the front housing 13 with the rear side closed by the cylinder block 12.
A rotatable drive shaft 17 is provided so as to penetrate the vicinity of the center of the crank chamber 16, and this drive shaft 17 is provided with a radial bearing 18 provided in the front housing 13 and another cylinder provided in the cylinder block 12. It is supported by a radial bearing 19.
A shaft sealing mechanism 20 is provided in front of the radial bearing 18 that supports the front portion of the drive shaft 17 so as to be in sliding contact with the circumferential surface of the drive shaft 17. The front end of the drive shaft 17 in this embodiment is connected to an external drive source via a power transmission mechanism (not shown).

A lug plate 21 is fixed to the drive shaft 17 in the crank chamber 16 so as to be integrally rotatable.
A swash plate 22 constituting a capacity changing mechanism is supported on the drive shaft 17 behind the lug plate 21 so as to be slidable and tiltable in the axial direction of the drive shaft 17.
A hinge mechanism 23 is interposed between the swash plate 22 and the lug plate 21, and the swash plate 22 is connected to the lug plate 21 and the drive shaft 17 through the hinge mechanism 23 so as to be capable of synchronous rotation and tilting. ing.

A coil spring 24 is wound between the lug plate 21 and the swash plate 22 in the drive shaft 17, and a slidable cylindrical body 25 urged rearward by the pressing of the coil spring 24 is a drive shaft. 17 is inserted.
The swash plate 22 is always pressed backward, that is, in a direction in which the inclination angle of the swash plate 22 decreases, by the cylindrical body 25 that receives the urging force of the coil spring 24. Here, the inclination angle of the swash plate 22 means an angle formed by a surface orthogonal to the drive shaft 17 and a surface of the swash plate 22.

A stopper portion 22a protrudes from the front portion of the swash plate 22, and the maximum inclination angle position of the swash plate 22 is regulated by the stopper portion 22a coming into contact with the lug plate 21. A retaining ring 26 is attached to the drive shaft 17 behind the swash plate 22, and a coil spring 27 is wound around the drive shaft 17 in front of the retaining ring 26. The minimum inclination angle position of the swash plate 22 is regulated by contacting the front portion of the coil spring 27. In FIG. 1, the swash plate 22 indicated by a solid line is at the maximum tilt angle position, and the swash plate 22 indicated by a virtual line is at the minimum tilt angle position.
A magnet 35 corresponding to an object to be detected is attached to the outer peripheral portion of the swash plate 22, and a magnetic sensor 36 corresponding to a detector is attached to the cylinder peripheral wall 12 b of the cylinder block 12 facing the magnet 35. This will be described in detail later.

In each cylinder bore 12 a (5 in this embodiment) of the cylinder block 12, single-headed pistons 28 are accommodated so as to be reciprocally movable, and the necks of these pistons 28 are arranged on the outer periphery of the swash plate 22 via shoes 29. Moored at. The sliding portion that is in sliding contact with the shoe 29 of the swash plate 22 is provided to be rotatable in synchronization with the rotation of the drive shaft 17.
When the drive shaft 17 rotates, the swash plate 22 rotates in synchronization with the drive shaft 17 and swings in the axial direction of the drive shaft 17 so that each piston 28 reciprocates back and forth through the shoe 29. Is done.

On the other hand, as shown in FIG. 1, the front side of the rear housing 14 and the rear side of the cylinder block 12 are joined with a valve plate 31 interposed therebetween.
A suction chamber 32 is formed on the center side in the rear housing 14, and a discharge chamber 33 is formed on the outer peripheral side in the rear housing 14. The suction chamber 32 and the discharge chamber 33 are respectively connected to the compression chamber 30 in the cylinder bore 12a by a suction port 31a and a discharge port 31b provided in the valve plate 31.
By the way, when each piston 28 moves from the top dead center position to the bottom dead center position, the refrigerant gas in the suction chamber 32 is sucked into the compression chamber 30 in the cylinder bore 12a through the suction port 31a. The refrigerant gas sucked into the compression chamber 30 is compressed to a predetermined pressure by movement from the bottom dead center position of the piston 28 to the top dead center position, and is discharged to the discharge chamber 33 through the discharge port 31b.

In the compressor 10, a capacity control valve 34 is disposed in the rear housing 14 in order to adjust the stroke of the piston 28, that is, the discharge capacity of the compressor 10 by changing the inclination angle of the swash plate 22.
The capacity control valve 34 is disposed in the middle of an air supply passage (not shown) that connects the discharge chamber 33 and the crank chamber 16.
The amount of high-pressure refrigerant gas introduced from the discharge chamber 33 into the crank chamber 16 through the adjustment of the valve opening of the capacity control valve 34 and an extraction passage (not shown) for connecting the crank chamber 16 and the suction chamber 32 to each other. The pressure in the crank chamber 16 is determined by the balance with the derived amount of the refrigerant gas led out from the crank chamber 16 to the suction chamber 32.
As a result, the pressure difference between the crank chamber 16 and the compression chamber 30 sandwiching the piston 28 is changed, and the inclination angle of the swash plate 22 is changed.

As shown in FIG. 2, the top dead center position of the swash plate 22 passes through the intersection point O between the line connecting the top dead center position P and bottom dead center position Q of the swash plate 22 and the axial center line m of the drive shaft 17. A bottomed round hole 22b is formed from the outer peripheral surface 22c of the swash plate 22 toward the axial center line m at the outer peripheral portion R of the swash plate 22 where the plane perpendicular to the line connecting P and the bottom dead center position Q intersects. The magnet 35 made of a permanent magnet is attached to the bottomed round hole 22b.
Further, a plurality of through holes 12c are formed between the piston 28 and the through bolt 15 in the housing peripheral wall 12b of the cylinder block 12 facing the magnet 35 in parallel to the axial center line m. A plurality of magnetic sensors 36 (in this embodiment, five of 36a, 36b, 36c, 36d, and 36e) for detecting the magnetic flux of the magnet 35 are attached. A Hall element is used as the magnetic sensor 36, and the position of the swash plate 22 is detected.

In the schematic diagrams shown in FIGS. 3 and 4, the maximum inclination angle position of the swash plate 22 is represented by a solid line, and the minimum inclination angle position of the swash plate 22 is represented by an imaginary line. The swash plate 22 can be controlled to an arbitrary inclination angle between the minimum inclination angle position and the maximum inclination angle position.
When the inclination angle of the swash plate 22 is changed within the range of the inclination angle, the outer peripheral portion R of the swash plate 22 to which the magnet 35 is attached is displaced in parallel to the axis line m. Here, the outer peripheral portion R at the minimum inclination angle position of the swash plate 22 is R0, and the outer peripheral portion R at the maximum inclination angle position is R1. Then, assuming that the displacement amount in the axial direction from R0 is Δg with the outer peripheral portion R0 at the minimum inclination angle position of the swash plate 22 as a base point, the displacement amount Δg is proportional to the inclination angle of the swash plate 22.

As shown in FIG. 4, the radial distance (R0, R1) centering on the axial center line m between the outer peripheral portions R0, R1 and the housing peripheral wall 12b at the respective inclination angle positions of the swash plate 22 passes. When a line perpendicular to the axis m is drawn, the distances between the intersections with the housing peripheral wall 12b and R0 and R1) are h and i, respectively, and h = i, and the swash plate 22 The distance in the radial direction does not change depending on the inclination angle.
Incidentally, considering another point on the outer periphery of the swash plate 22, for example, the top dead center position P, as shown in FIG. 3, the top dead at the minimum inclination angle position and the maximum inclination angle position of the swash plate 22 is shown. If the radial distances between the point position P and the housing peripheral wall 12 b are j and k, respectively, j <k, and the radial distance varies depending on the inclination angle of the swash plate 22.
Accordingly, the magnet 35 attached to the outer peripheral portion R of the swash plate 22 does not change because the radial distance between the magnet 35 and the housing peripheral wall 12b is the same due to the rotation accompanying the change in the inclination angle of the swash plate 22. Rotational motion is performed in a state where the outer peripheral portion R0 at the minimum inclination angle position is displaced by Δg in the axial direction from the base point.

In order to detect the position of the magnet 35, a magnetic sensor 36 is provided on the housing peripheral wall 12b. As shown in FIG. 4, the magnetic sensor 36 includes five sensors 36a, 36b, 36c, 36d having the same specifications. , 36e, respectively, are arranged in the region from the minimum inclination angle position of the swash plate 22 to the maximum inclination angle position.
Here, a magnetic sensor 36a is provided facing the magnet 35 at the minimum tilt angle position of the swash plate 22, and a magnetic sensor 36e is provided facing the magnet 35 at the maximum tilt angle position, corresponding to the tilt angle therebetween. Magnetic sensors 36b, 36c and 36d are respectively provided.

The magnetic sensors 36a, 36b, 36c, 36d, and 36e transmit the detected magnetic flux density to a control unit (not shown) connected to the magnetic sensor 36. The control unit detects the position of the magnet 35 attached to the outer peripheral portion R of the swash plate 22 from the magnitude of the magnetic flux density sensed by each magnetic sensor 36.
In the control unit, data relating to the displacement amount Δg of the swash plate 22 corresponding to each magnetic sensor 36a, 36b, 36c, 36d, 36e, correspondence data between the displacement amount Δg and the inclination angle of the swash plate 22, and the like are stored in advance. Therefore, the control unit can calculate the inclination angle of the swash plate 22 to be detected and obtain the discharge capacity of the compressor by performing arithmetic processing based on a predetermined program.

Next, the operation of the compressor 10 according to this embodiment will be described.
As the drive shaft 17 rotates, the swash plate 22 swings and rotates, and the piston 28 connected to the swash plate 22 reciprocates in the front-rear direction to suck, compress, and discharge refrigerant gas.
The inclination angle of the swash plate 22 is controlled by changing the pressure difference between the crank chamber 16 and the compression chamber 30 sandwiching the piston 28 by the capacity control valve 34.
Here, consider a case where the swash plate 22 is rotating at a certain inclination angle. For example, in FIG. 4, when the magnet 35 of the swash plate 22 is located at a point R2 displaced by Δg2 in the axial direction from the outer peripheral portion R0 of the swash plate 22, the magnetic sensors 36a, 36b, 36c, 36d, and 36e are The sensed magnetic flux density at each position is transmitted to the control unit as a detection signal.

In this case, since the magnetic sensor 36c is located closest to the magnet 35 of the swash plate 22 at the R2 point, the magnetic flux density detected by the magnetic sensor 36c is the highest, and the control unit has the magnetic sensor 36c. It is detected that the swash plate 22 exists at the position of the displacement amount Δg2 corresponding to.
Further, the control unit performs arithmetic processing with a predetermined program based on the detected position signal, calculates the tilt angle of the swash plate 22 and outputs it.

The compressor according to this embodiment has the following effects.
(1) The magnet 35 passes through the intersection point O between the line connecting the top dead center position P and the bottom dead center position Q of the swash plate 22 and the axis line m of the drive shaft 17, and the top dead center position P of the swash plate 22 Since the surface perpendicular to the line connecting the bottom dead center position Q intersects with the outer peripheral portion R of the swash plate 22, even if the inclination angle of the swash plate 22 changes, the magnet 35 is merely displaced in the axial direction. The distance between the magnetic sensor 36 and the magnet 35 provided on the housing peripheral wall 12b changes in the axial direction, but does not change the radial distance perpendicular thereto. Accordingly, the magnetic sensor 36 can accurately detect the displacement of the magnet 35 in the axial direction, and can accurately detect the inclination angle of the swash plate 22 proportional to the displacement of the magnet 35. Since the tilt angle position is the base point, the magnet 35 provided on the swash plate 22 in accordance with the tilt angle change of the swash plate 22 is based on the position of the magnet 35 at the minimum tilt angle position of the swash plate 22. Displace parallel to the axial direction. Therefore, the magnetic sensor 36 can detect the tilt angle of the swash plate 22 with high accuracy by detecting the displacement amount Δg from the base point of the magnet 35 in accordance with the tilt angle change of the swash plate 22.
(3) A plurality of magnetic sensors 36a, 36b, 36c, 36d, 36e are arranged in parallel to the axial direction in a region from the minimum inclination angle position of the swash plate 22 to the maximum inclination angle position, and the magnetic sensors 36a, 36b. , 36c, 36d, and 36e are provided corresponding to the displacement amount Δg from the base point of the magnet 35. Therefore, when the magnet 35 on the swash plate 22 is displaced in the axial direction along with the change in the tilt angle of the swash plate 22, the magnetic sensors 36a, 36b, 36c, 36d, 36e closest to the displaced magnet 35 are used. Thus, the inclination angle of the swash plate 22 can be detected with higher accuracy.
(4) The radial distance between the magnet 35 on the swash plate 22 and the magnetic sensor 36 does not change and is constant, and only the axial distance changes. Therefore, when adjusting the detection sensitivities of the magnetic sensors 36a, 36b, 36c, 36d, and 36e, it is not necessary to perform distance correction or the like associated with a change in the radial distance between the sensors, and the adjustment can be simplified.
(5) Since the magnet 35 and the magnetic sensor 36 are used, it is easy to handle, and it is only necessary to fix it to the peripheral wall 12b of the housing.
(6) The magnetic sensor 36 is provided between the piston 28 and the through bolt 15 on the housing peripheral wall 12b of the cylinder block 12, and since there is no obstacle between them, the magnetic flux density of the magnet 35 on the swash plate 22 is accurately determined. It can be detected well.

(Second Embodiment)
Next, a variable capacity compressor according to a second embodiment will be described with reference to FIGS.
The compressor of this embodiment is one in which the number of magnetic sensors 36 in the compressor 10 according to the first embodiment is one, and other configurations are common.
Therefore, here, for convenience of explanation, a part of the reference numerals used in the previous explanation is used in common, the explanation of the common configuration is omitted, and only the changed part is explained.

As shown in FIG. 6, one magnetic sensor 40 is provided on the housing peripheral wall 12 b at a position facing the magnet 35 at the minimum inclination angle position of the swash plate 22.
The magnetic sensor 40 detects the magnetic flux density of the magnet 35 on the swash plate 22 and transmits it to the control unit. The magnetic sensor 40 in the present embodiment detects the position of the swash plate 22 (the amount of displacement Δg in the axial direction from the base point) based on the magnitude of the detected magnetic flux density. Data corresponding to the detected output (magnetic flux density) and the displacement Δg of the swash plate 22, correspondence data of the displacement Δg and the inclination angle of the swash plate 22, and the like are stored.
The control unit performs calculation processing based on a predetermined program, thereby calculating the displacement amount Δg and the inclination angle of the detection target swash plate 22 and obtaining output information.

The compressor according to this embodiment has the following effects.
The effects (1), (2), (5), and (6) in the first embodiment are the same, and other effects are described.
(1) The magnetic sensor 40 is provided to face the magnet 35 at the minimum inclination angle position of the swash plate 22. Therefore, when the magnet 35 on the swash plate 22 is displaced in the axial direction in accordance with the change in the inclination angle of the swash plate 22, the magnetic flux density of the displaced magnet 35 is detected, so that the base point of the swash plate 22 can be detected. The displacement amount Δg and the inclination angle can be calculated, and a single magnetic sensor 40 can be used without using a plurality of magnetic sensors. Therefore, the number of parts can be reduced and the apparatus can be simplified.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.
In the first and second embodiments, the swash plate 22 passes through the intersection O between the line connecting the top dead center position P and the bottom dead center position Q and the axis line m of the drive shaft 17 and Although it has been described that the magnet 35 is attached to the outer peripheral portion R of the swash plate 22 where the plane perpendicular to the line connecting the dead center position P and the lower dead center position Q intersects, as shown in FIG. A magnet may be attached to the outer peripheral portion S on the opposite side of 180 °, and a magnetic sensor may be provided to face the magnet. Further, in addition to the outer peripheral portion R of the swash plate 22, a magnet may be attached to the outer peripheral portion S to detect both. In this case, the detection reliability can be improved.
In the first and second embodiments, the detection target and the detector are described as a magnet and a magnetic sensor. However, a magnetic body may be used instead of the magnet. The magnetic sensor may be a magnetic induction sensor other than a Hall element, an MR sensor, an MI sensor, or the like.
In the first and second embodiments, the detection target and the detector are described as a magnet and a magnetic sensor. However, the present invention is not limited to this, and various types such as an ultrasonic type and an optical type are used. Is possible.
In the first and second embodiments, the magnetic sensor is described as being attached to the housing peripheral surface. However, the magnetic sensor may be attached to a bolt that connects the housings provided in the vicinity of the housing peripheral surface. Further, another mounting member may be provided, and the magnetic sensor may be fixed to the mounting member.

It is a secondary sectional view of the compressor concerning a 1st embodiment. It is the sectional view on the AA line of FIG. It is a schematic diagram for demonstrating the inclination-angle detection of the swash plate which concerns on 1st Embodiment. It is a B direction arrow line view of FIG. It is a schematic diagram for demonstrating the inclination-angle detection of the swash plate which concerns on 2nd Embodiment. It is a C direction arrow directional view of FIG.

Explanation of symbols

10 Compressor 11 Housing 12a Cylinder bore 16 Crank chamber 17 Drive shaft 22 Swash plate 28 Piston 29 Shoe 30 Compression chamber 35 Magnet 36 Magnetic sensor P Top dead center position Q Bottom dead center position R Outer peripheral part m Center axis

Claims (3)

A piston and a swash plate provided in the housing are connected via a shoe, and a sliding portion that is in sliding contact with the shoe of the swash plate is provided to be rotatable in synchronization with the rotation of the drive shaft,
The piston is configured to change the stroke of the piston by controlling the inclination angle of the swash plate that performs a swinging motion in the axial direction of the drive shaft while rotating synchronously with the drive shaft as the drive shaft rotates. In variable capacity compressors,
A detection object provided on the outer periphery of the swash plate, and a detector provided on the housing opposite the detection object;
The detected object passes through the intersection of a line connecting the top dead center position and bottom dead center position of the swash plate and the axis of the drive shaft, and the top dead center position and bottom dead center position of the swash plate are determined. A capacity detecting device for a variable capacity compressor, wherein the capacity detecting apparatus is provided on an outer peripheral portion of the swash plate where planes perpendicular to a connecting line intersect. The capacity detector of the variable capacity compressor according to claim 1, wherein the detector is arranged in a region from a minimum inclination angle position of the swash plate to a maximum inclination angle position. 3. The variable according to claim 1, wherein the object to be detected is a magnet, the detector is a magnetic sensor, and a plurality of the magnetic sensors are arranged on the peripheral wall of the housing in parallel to the axial line. Capacity detector for capacity type compressors.

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