JPH04143470A - Variable capacity compressor with swash plate - Google Patents

Abstract

PURPOSE:To provide a simple sensing means for the discharge capacity of a swash plate type compressor with variable capacity by furnishing a spool with a location sensing means in opposite arrangement, and installing a switching means which emits an electric signal associate with displacement of a respond moving member displaceable in compliance with displacement of the spool. CONSTITUTION:A location sensing means 500 is installed on the surface of rear housing 13 confronting a spool 30, and a respond moving member 515 displacing together with the spool 30 is mounted in the part of spool 30 confronting the central opening 514 of a switch housing 501 at a certain specified distance between the end face of the respond moving member 515 and a movable contact member 504 in the condition that the spool 30 is displaced to the max. capacity side of compressor. The location sensing means 500 emits the output 0 from all of No.1 terminal and No.2 terminals 522, 524 when the discharge capacity of the compressor is large, and emits the output 0 from the No.1 terminal 522 and the output 1 from the No.2 terminal 524 when the capacity is medium, and emits the output 1 both from the No.1 terminal 522 and No.2 terminal 524 when the capacity is small.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to capacity detection of a swash plate compressor, and is effective for use as a refrigerant compressor in an automobile air conditioner, for example.

[Background of the invention]

In a swash plate compressor, a working chamber is formed on both sides of a piston, the piston reciprocates in response to the swinging operation of a swash plate, and fluid is inflowed, compressed, and discharged in the working chamber according to this reciprocating movement. The inventors have already discovered that the reciprocating stroke of the piston can be controlled and the discharge capacity of the compressor can be varied by displacing the center of rotation of the swash plate in the shaft axial direction and the inclination angle of the swash plate. Proposed. In other words, in this type of variable displacement swash plate compressor, the rotation center position and the inclination angle of the swash plate are displaced in relation to each other, so that the working chamber formed on one side of the piston is always in the upper position. The dead center position is controlled to be substantially constant, and thereby the discharge capacity is variably controlled as the piston reciprocating stroke amount changes. On the other hand, in the working chamber formed on the other side of the piston, the dead volume increases as the reciprocating stroke amount of the piston decreases, and capacity control is performed by losing the compression effect due to internal compression.

When this type of variable displacement swash plate compressor is actually used as a compressor for an air conditioner, it is difficult to accurately determine the discharge capacity of the compressor during operation. It becomes necessary. Therefore, it has already been proposed to magnetically detect the stroke amount of the piston and calculate the displacement of the compressor from the displacement of the piston stroke amount.

This proposed capacity detection method directly detects the amount of movement of the piston, so the discharge capacity of the compressor can be accurately determined, but on the other hand, the displacement of the piston cannot be directly detected mechanically. Therefore, the configuration becomes complicated,
Durability and cost problems will arise.

[Problem to be solved by the invention]

The present invention has been devised in view of the above points, and an object of the present invention is to provide a simple means for detecting the discharge capacity of a variable displacement swash plate compressor.

〔composition〕

In order to achieve the above object, in the variable displacement swash plate compressor of the present invention, position detection means is disposed opposite to the spool that changes the rotation angle and rotation center position of the swash plate. The position detecting means is provided with a responsive member that directly engages with the spool and is movable in accordance with the positional displacement of the spool. Further, a switch means is provided for outputting an electric signal in accordance with the displacement of the responsive member.

[Effect]

With the adoption of the above configuration, in the variable displacement swash plate compressor of the present invention, the displacement of the spool is mechanically transmitted to the switch means via the response member, and the switch means is switched on and off. . That is, with a mechanically simple configuration, the positional displacement of the spool is output as an electrical signal. Then, the position of the spool is detected based on the displacement of this electric signal, and the discharge capacity of the compressor can be easily determined from the spool position.

〔effect〕

Therefore, in the variable capacity swash plate compressor of the present invention, it is possible to grasp the discharge capacity of the compressor with a simple configuration. In particular, since a response means that specifically engages with the spool is used as a means for grasping compressor discharge, detection of displacement becomes more reliable.

Similarly, since the responsive member and the switch means are mechanically simple, the reliability of the position detection means can be greatly improved and durability can be maintained.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view of a variable displacement swash plate compressor. A front housing 4, a front side plate 8, an intake valve 9, a front cylinder block 5, a rear cylinder block 6, an intake valve 12, a rear side plate 11, and a rear housing 13 made of aluminum alloy are integrally fixed by through bolts (not shown). It forms the outer shell of the compressor.

The cylinder block 5.6 is provided with five cylinders 64.65, each of which is parallel to the other. A shaft 1, which rotates under the driving force of an automobile engine (not shown), is rotatably supported by a front cylinder block 5 and a spool 30 via bearings 2 and 3, respectively. Further, the thrust force (force acting in the left direction in the figure) applied to the shirt 1 is received by the front cylinder block 5 via the thrust bearing 15.

The rear end of the shaft 1 is slidably inserted into a support portion 405, and the support portion 405 is rotatably supported by the spool 30 via a bearing 3.

Note that a spring 3 is provided between the rear end of the shaft 1 and the support portion 405 to apply a preload to the spool 30 toward the right side in the figure.
08 is installed. Further, the thrust force acting on the support portion 405 (the force acting in the right direction in the figure) is received by the spool 30 via the thrust bearing 14. The spool 30 is disposed within the cylindrical portion 66 of the rear cylinder block 6 and the cylindrical portion 135 of the rear housing 13 so as to be slidable in the axial direction.

A spherical recess 107 is formed in the center of the swash plate 10, and a spherical support 406 formed at the end of the support 405 is disposed in the spherical recess 107. It is supported by a support section 406.

A slit 105 is formed on the front side surface of the swash plate 10, and a flat plate portion 165 is formed on the shaft 1. By disposing the flat plate portion 165 in surface contact with the inner wall of the slit 105, the rotational driving force applied to the shaft 1 is transmitted to the swash plate 10.

Furthermore, shoes 18 and 19 are slidably disposed on both sides of the swash plate 10. On the other hand, a piston 7 is slidably disposed within a cylinder 64 of the front cylinder block 5 and a cylinder 65 of the rear cylinder block 6. As described above, the shoes 18 and 19 are slidably attached to the swash plate 10. Furthermore, the shoes 18 and 19 are rotatably engaged with the inner surface of the piston 7. Therefore, the rocking motion accompanying the rotation of the swash plate 10 is transmitted to the piston via the shoes 18 and 19 as a reciprocating motion. The shoes 18 and 19 are formed so that their outer surfaces lie on the same spherical surface when assembled on the swash plate 10.

A long groove 166 is provided in the flat plate portion 165 of the shaft 1, and a pin passage hole is formed in the swash plate IO. After the flat plate portion 165 of the shaft 1 is disposed in the slit 105 of the swash plate lO, it is locked in the long groove 166 of the shaft 1 by the pin 80 and the retaining ring. The inclination of the swash plate changes depending on the position of the pin 80 in this long groove 166, and as the inclination changes, the position of the center of the swash plate (spherical recess 107 spherical support 406) also changes. That is, in the first working chamber 60 on the right side in FIG. 1, even if the inclination of the swash plate lO changes and the stroke of the piston 7 changes, the top dead center of the piston 7 on the working chamber 60 side hardly changes and remains dead. The long grooves 166 are provided so that substantially no increase in volume occurs. On the other hand, in the second working chamber 50 on the left side in the figure, the top dead center of the piston 7 changes as the inclination of the swash plate changes, so the dead volume also changes.

Strictly speaking, the long groove 166 has a curved shape, but in actual formation, it can be approximated by a substantially straight long groove.

Further, in this example, the long grooves 166 are arranged on the axis of the shaft l so that the shape of the flat plate portion 165 does not become excessively large due to the formation of the long grooves 166.

Reference numeral 21 in the figure is a shaft sealing device, which prevents refrigerant gas and lubricating oil from leaking to the outside along the shaft 1. Reference numeral 24 in the figure opens into the working chamber 50, 60, and the discharge chamber 90,
The discharge port 24 is opened and closed by the discharge valve 23 . The discharge valve is fixed to the front side plate 8 and the rear side plate 11 with a valve holder (not shown) and a bolt (not shown).1 In the figure, reference numeral 25 is a suction port that communicates the working chamber 50.60 and the suction chamber 72.74. , the suction valve 9 and the suction valve 12.

In the figure, 400 indicates the signal pressure introduced into the control pressure chamber 200.
This is a control valve that continuously controls the pressure within the discharge space 93 and the pressure within the suction space 74.

A position detection means 500 is arranged on the surface of the rear housing 13 facing the spool 30.

This position detection means 500 has a switch housing 501 made of aluminum, as shown in FIG. The switch housing 501 has a cylindrical upper part 502, and a resin support ring 503 is disposed within the cylindrical upper part 502. A movable contact member 504 and a fixed contact member 505 made of a conductive material, for example a copper material, are arranged inside the support ring.

Further, a fixing plate 506 made of a resin material is arranged in the switch housing 501 so as to come into contact with the support ring 503, and this fixing plate 506 is attached to a ring nut 507.
The position is fixed. Furthermore, an intermediate contact member 508 is disposed within the support ring 503 at a predetermined distance apart from the movable contact member 504 in an unattached state. The movable contact member 504 and the intermediate contact member 508 are held in position by springs 509 and 510, respectively.

Reference numeral 511 is a lead wire connected to the spring 510, and reference numeral 512 is a lead wire extending from the fixed contact member.

The switch housing 501 is fixed to the rear housing 13 with bolts 513. Further, a response member 515 that is displaced together with the spool 30 is fixedly attached to a portion of the spool 30 that faces the central opening 514 of the switch housing. When the spool 30 is displaced to the maximum capacity side of the compressor, the responsive member 515
15 A predetermined gap δ1 between the end face and the movable contact member 504
are attached to the spool 30 so as to be arranged at a distance of .

The operation of the compressor with the above configuration will be described.

When an electromagnetic clutch (not shown) is connected and driving force from the engine is transmitted to the shaft 1, the compressor starts.

When the compressor is started after being stopped for a long time, there is no pressure difference inside the compressor.

Therefore, the pressure within the control pressure chamber 200 is not significantly different from the pressure within the suction space 74. In this way, no pressure difference occurs before and after the spool 30. That is, at the time of startup, the swash plate 10 is
No load is applied in the direction that makes it tilt. and,
The spool 30 is displaced to the right in the figure by the set load of the spring 308, and the swash plate 10 is held in a state where its angle of inclination is the minimum.

When the shaft 1 starts rotating in this state, the rotation of the shaft 1 causes the piston 7 to reciprocate via the swash plate 10. As the piston 7 moves back and forth, the refrigerant is sucked, compressed, and discharged within the working chamber 50, 60.

The refrigerant gas sucked in through the suction port 85 (connected to the evaporator of the refrigeration cycle) is fed into the central suction space 7.
0, then passes through the suction passage and enters the front and rear suction chambers 72 and 74. Thereafter, during the suction stroke of the piston 7, the air is sucked into the working chamber 50, 60 from the suction port 25 via the suction valve 912. The sucked refrigerant gas is compressed in the compression stroke, and once compressed to a predetermined pressure, the refrigerant gas is discharged from the discharge port 24.
The discharge valve 23 is then pushed open and the discharge is discharged into the discharge chambers 90 and 93. The high-pressure refrigerant gas passes through the discharge passage and is discharged from the discharge port to a condenser (not shown) of the refrigeration cycle.

At this time, since the second working chamber 50 on the front side has a large dead volume, the compression ratio is smaller than that of the first working chamber 60 on the rear side, and the pressure of the refrigerant gas in the second working chamber 50 is the pressure in the discharge space ( The discharge pressure of the first working chamber 60 on the rear side is lower than that of the first working chamber 60 (the discharge pressure is guided). Therefore, the action of sucking and discharging refrigerant gas in the second working chamber 50 on the front side is not performed.

When starting the compressor, the compressor discharge capacity is set to the minimum capacity as described above. However, if the compressor capacity required by the refrigeration cycle is high, it is necessary to increase the discharge capacity of the compressor.

Here, it is known that the capacity required of the compressor, that is, the cooling load, has a correlation with the suction side pressure of the compressor. That is, when the cooling load is high and the compressor requires a large capacity, the suction side pressure increases due to superheating in the evaporator. Conversely, when the cooling load is small and the discharge capacity required of the compressor is small, there is no large superheat in the evaporator and the suction side pressure is low.

In the control valve 400 of this example, when the pressure on the suction side becomes low, the signal pressure passage 402 is communicated with the high pressure introduction passage 403. Therefore, the pressure within the discharge space 93 is introduced into the control pressure chamber 200 .

When the pressure in the discharge space 93 increases as the compressor is started, the pressure in the control pressure chamber 200 also increases in response to this pressure increase.

Therefore, the force acting on the spool 30 to the left in the figure due to the pressure difference (due to the pressure difference between the control pressure chamber 200 and the suction space 74) gradually increases as the compressor rotates. When this force overcomes the force pushing the spherical support portion 405 to the right in the figure and the resultant force of the spring 308, the spool 30 gradually begins to move to the left in the figure. Then, due to the action of the long groove 166 of the shaft 1 and the pin 80, the swash plate 10 moves its rotation center (spherical support portion 405) to the left in the figure and increases its inclination. As it rises, the spool 30 moves to the left in the figure until its shoulder 305 touches the rear side plate 11, achieving maximum capacity.

This is the situation shown in FIG. In this state, the refrigerant gas sucked from the suction boat enters the central suction space 70,
They flow through suction passages into suction chambers 72 and 74, respectively. In the suction stroke, the air enters the working chambers 50 and 60 from the suction port 25 through the suction valves 9 and 12, respectively, is compressed with the displacement of the piston 7, and flows from the discharge port 24 through the discharge valve 23 into the discharge space. 90 and 93, passes through a discharge passage, is discharged from a discharge boat, and joins at an external pipe. In this state, both the working chamber 50 and the working chamber 60 perform the action of sucking and discharging refrigerant gas.

After the compressor starts operating, when the cooling load decreases and the pressure on the suction side decreases again, the control valve 4
00 controls the pressure output to the signal pressure passage 402. That is, the pressure is appropriately mixed between the discharge pressure introduced via the high pressure passage 403 and the suction pressure introduced via the low pressure passage 404 to obtain a signal pressure.

In this way, the spool 30 is displaced in accordance with the output signal from the control valve 400, thereby appropriately controlling the discharge capacity of the compressor. Here, it is necessary to know the capacity of the compressor in order to accurately control the air conditioner. In particular, when the control valve 400 is an electrically controlled valve that appropriately switches between the low pressure introduction passage 404 and the high pressure introduction passage 403 in response to an external electrical signal, an accurate signal is sent to the control valve 400. However, it is desirable to know the discharge capacity of the compressor at each point in time.

Since the compressor of this example uses the position detection member 500, it is possible to accurately grasp the discharge capacity of the compressor from the position of the spool 30.

FIG. 3 is a graph showing the relationship between the moving position of the spool and the capacity of the compressor. The reason why the capacity characteristics change in two stages in the figure is that in the second working chamber 50, the dead volume immediately increases as the stroke amount changes. That is, in the second working chamber 5q, the compression capacity rapidly decreases as the dead volume increases, and simply by increasing the dead volume by a predetermined amount, the compression and discharge action can no longer be exerted. On the other hand, the first working chamber 60 side is
Since the piston 7 can always advance to its top dead center position, the discharge capacity decreases almost uniformly as the stroke changes. The characteristics of section B in FIG. 3 mainly indicate a decrease in the compressor discharge capacity due to a decrease in the stroke amount of the first working chamber 60 example.

As is clear from FIG. 3, by measuring the moving distance of the spool, the discharge capacity of the compressor can be determined almost accurately. Specifically, when the moving distance of the spool is δl or less, the discharge capacity of the compressor can be considered to be a large capacity of 80% or more. Also, if the moving distance of the spool is 61 or more and the amount is less than δ1 + δ2, the discharge capacity of the compressor is 4
It can be understood that the capacity is medium between 0% and 80%. moreover,
When the displacement of the spool 30 increases by δl+δ2 or more, the discharge capacity of the compressor is 40% or less, which can be considered to be a small capacity operation.

In this example, the amount of displacement of the spool is detected as an electrical signal by the position detection means.

FIG. 4 is an electrical circuit diagram showing the connection state of the position detection means 500, in which the switch housing 500 is grounded to the vehicle body via the compressor housing. Further, the lead wire 511 is grounded via a resistor 520 having a large capacity (for example, 10 kilohms). In addition, the lead wire 511 and the resistor 520
A first signal output terminal 522 is provided between the two terminals.

On the other hand, the lead wire 512 has a predetermined amount of relatively small capacity (for example, 1
It is connected to an on-vehicle battery 523 via a second resistor 521 (1 kilohm). A second output terminal 524 is branched between the lead wire 512 and the second resistor 521.

FIGS. 5(a), 5(b) and 5(C) show the switching operation of this position detecting means as the spool 30 is displaced.

When the compressor is operating at a large capacity, the spool 30 is displaced to the left in FIG. Therefore, the response member 15
is similarly displaced to the left in the figure, and the response member 515 is separated from the operating contact member 504 as shown in FIG. 5(a). In this state, the potential of the lead wire 512 is transferred from the fixed contact member 505 to the operating contact member 504 via the spring 509.
The switch housing 501 is connected to the disc spring 516, and is further grounded to the vehicle body side via the switch housing 501. That is, the potential of the lead wire 512 becomes OV. As a result, the output of the second output contact 524 becomes OV. On the other hand, lead wire 511
is connected to the intermediate contact member 508 via a spring, but since this intermediate contact member is electrically insulated,
No voltage is applied to the lead wire 511. As a result, the output of the first output contact 522 is also 0■.

When the pressure in the signal pressure chamber 200 is reduced based on the signal from the control valve 400 and the spool 30 is displaced to the right in FIG. 1, the capacity of the compressor is reduced. Then, when the spool 30 moves a predetermined distance δ1, the responsive member 515 moves the operating contact 504 to the disc spring 516 as shown in FIG. 5(b).
It will be separated from Therefore, although the voltage applied to the lead wire 512 is transmitted from the spring 509 to the working contact 504, it is not grounded to the switch housing 501 side due to electrical insulation between the working contact 504 and the disc spring 516. Therefore, the voltage from the vehicle battery 523 is output to the second output contact 524.

On the other hand, in the state shown in FIG. 5(b), the intermediate contact member 50
8 is separated from the transfer operation contact member 504, and the lead wire 5
11 is not energized, so the voltage at the first output terminal 522 is 0.

When the pressure in the control pressure chamber 200 further decreases based on the signal from the control valve 400 and the spool 30 moves further toward the right in FIG. 1, the reciprocating stroke of the piston 7 decreases.
The discharge capacity of the compressor is small.

This state is the state shown in FIG. 5(C), in which the amount of movement of the spool 30 is greater than or equal to the displacement δ1+62. Therefore, the responsive member 515 presses the operating contact 504 in the right direction in the figure, and the operating contact 504 and the intermediate contact 50B come into contact with each other. In this state, the operating contact 504 is detached from the disc spring 516 as in FIG. Ru.

On the other hand, the lead wire 511 is connected to the spring 510. It is electrically connected to the lead wire 512 via the intermediate contact member 508, the working contact member 504, the spring 509, and the fixed contact member 505, and voltage from the vehicle battery 523 is applied thereto. Here, since the first resistor 520 has a larger capacitance than the second resistor 521, the first output terminal 522 is supplied with a high voltage almost equivalent to that of the second output terminal 524 (for example, 11
) will be applied.

Table 1 shows the states when the outputs of the first output terminal 522 and the second output terminal 524 are set as 1 when the output is above a predetermined value (for example, 8 V) and 0 when the output is below a predetermined value V.

Table 1 As is clear from this table, when the discharge capacity of the compressor is large, both the first and second terminals 522 and 524 output O, and when the capacity of the compressor is medium, the output from the first terminal 522 is O. The output is O and the output from the second terminal 524 is 1.

Also, when the discharge capacity of the compressor is small,
Both the first terminal 522 and the second terminal 524 output 1. Therefore, by electrically inputting signals from the first and second terminals, the capacity of the compressor can be changed to large capacity, medium capacity, or
This means that it can be reliably determined whether the capacity is small or small.

In the above example, an electric contact type is used as the position detecting means 500, but a reed switch as shown in FIG. 6 may be used as the position detecting means. In FIG. 6, 603 and 604 are reed switch notches that are switched on and off by receiving magnetic force from a magnet. The lead wire 511 is output to the first reed switch 604, and the lead wire 512 is output to the second reed switch 604.
17-dos switch 603. This reeds
A magnet 610 is arranged in the middle part of the switches 604 and 603, and this magnet 610 is attached to the insulating plate by a holding cover 612.
It is fixed at 06. A magnetic shield 605 is provided to cover the magnet 610, and this magnetic shield 605 is connected to the screw 6.
07 to the movable member 606. Note that the operating member is held by the housing 501 via a disc spring 609. The distance δl between the movable member 606 and the responsive member 515 is determined in the same manner as in the above embodiment.

Furthermore, the magnetic shield 605 has an 11th seal end face.
It is set to differ by a predetermined distance δ2 between the 7-dead switch 604 side and the second reed switch 603 side. This distance δ2 is determined based on the same concept as that of the above-mentioned embodiment.

FIG. 7 is an electrical circuit diagram showing the wiring state of this reed switch type position detection member. Also, Fig. 8(a), et al.
, (C) respectively show the operating states of the reed switch-type position detection means, and (a) of Fig. 8 shows the state in which the compressor is operating at a large capacity, and the spool 30 is moved toward the left in the figure. It is displaced to . Therefore, the magnetic shield 605 is displaced to the left in the figure by the force of the spring 608 together with the operating member 606, and the magnet 610 is not substantially covered.

Therefore, the magnetic field lines from the magnet 610 are transmitted to the reed switch 60.
4 and 603, and upon receiving this magnetic force, the reed switch is closed. Therefore, the lead wire 511 is grounded from the reed switch 604 to the switch housing 501 side via the conductive terminal 613. Similarly, the lead wire 512 is connected to the conductive terminal 61 via the reed switch 603.
4 to the switch housing 501 side. As a result, the voltage level at both the first output terminal and the second output terminal becomes 0■.

The spool 30 is displaced in a direction that reduces the capacity of the compressor, and the displacement is transmitted to the magnetic shield via the response member 515, and the magnetic shield is only connected to the second reed switch 604 side as shown in FIG. 8(b). This is the position that blocks magnetic fields.

As a result, the magnetic force from the magnet 610 is not transmitted to the second reed switch 604 but is transmitted to the first reed switch 603. As a result, the second reed switch 604 becomes open, while the first reed switch 603 remains closed. Therefore, the first output terminal 5
The output voltage of the terminal 22 is maintained at 0, but the output voltage of the second output terminal 5
A voltage from an on-vehicle power source 523 is applied to 24.

When the spool is further displaced to the smaller capacity side and the magnetic shield 606 is displaced to the right in the figure via the response member 515, the magnetic force of the magnet 610 is cut off on both the first reed switch 603 side and the second reed switch 604 side. will be done. Therefore, in this state, both reed switches 603.6
04 are both open. Therefore, the voltage from the on-vehicle power supply 523 side is no longer grounded to the switch housing 501 side, and a predetermined voltage is applied to both the first output terminal 522 and the second output terminal 524.

Therefore, even with a reed switch type position detection means as shown in Fig. 6, signals similar to those shown in Table 1 above can be output from the output terminal, thereby increasing the discharge capacity of the compressor. It can be classified into three levels: , medium-capacity, and small-capacity.

In the above-described embodiment, a switch having two output terminals was used as a symbol, but the displacement of the spool may be further subdivided to provide three or more output terminals. In this case, the discharge capacity of the compressor will be determined more precisely.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the compressor of the present invention, Fig. 2 is a sectional view showing the position detection means shown in Fig. 1, and Fig. 3 shows the relationship between the moving distance of the spool and the compressor discharge capacity. FIG. 4 is a circuit diagram showing the electrical connection state of the position detection means shown in FIG. 1, and FIGS. 6 is a sectional view showing another example of the position detecting means used in the compressor of the present invention, FIG. 7 is a circuit diagram showing the connection state of the position detecting means shown in FIG. 6, and FIG. 6a), (b), and (C) are block diagrams showing the operating states of the position detection means shown in FIG. 6, respectively; FIG. 1...shaft, 7...piston, 50.60...
- Working chamber, 30... Spool, 500... Position detection means. 515...Response member, 504... Operating contact, 5o5
... Fixed contact, 508 ... Intermediate contact, 603,60
4...Reed switch. Representative Patent Attorney Takashi Okabe (and 1 other person) Suff'-le's Hook 4 > Distance 1 Diagram Reed Mata Fuy + Person Diagram

Claims (1)

[Scope of Claims] A cylinder block having a cylinder chamber inside; a shaft rotatably disposed within the cylinder block; a swash plate pivotally connected to the shaft and rotating integrally with the shaft; a piston that is slidably disposed within a cylinder chamber and reciprocates within the cylinder chamber in response to the rocking motion of the swash plate; , engaged with the swash plate and a working chamber that sucks in, compresses, and discharges fluid based on changes in internal volume;
Displacing the rotational center position of the swash plate in the axial direction of the shaft, and displacing the inclination angle of the swash plate, so that in the working chamber formed on one side of the piston, regardless of the inclination angle of the swash plate, A spool for controlling the top dead center position of the spool to be substantially constant; and a position detecting means disposed opposite to the spool for outputting a displacement of the spool as an electric signal, and the position detecting means is configured to A variable capacity swash plate type compressor comprising a responsive member movable according to displacement, and a switch means for switching an electric signal according to the displacement of the responsive member.