JP2002364530A - Variable displacement compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide effective technique to stabilize the behavior of a rotating swash plate relative to a driving shaft in a variable displacement compressor. SOLUTION: The swash plate variable displacement compressor 100 comprises the rotating swash plate 11 having a storage portion 11a for storing a coil spring 10 and an engagement member 10a mounted at the end of the coil spring 10 on the side of the driving shaft. A recessed portion 8b shaped corresponding to the engagement member 10a is provided at a position corresponding to the engagement member 10a on an outer periphery face 8a of the driving shaft 8. The coil spring 10 elastically energizes the engagement member 10a fitted into the recessed portion 8b further to the direction of the recessed portion 8b. Thus, the engagement member 10a for engaging the recessed portion 8b is further thrust by the coil spring 10. When the rotating swash plate 11 is about to move relative to the driving shaft 8, friction force to be exerted between the recessed portion 8b and the engagement member 10a is further enhanced by the coil spring 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type variable displacement compressor used for a vehicle air conditioner or the like.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 11-264371 discloses that
A swash plate type variable displacement compressor used for vehicle air conditioning is disclosed. In this compressor, the torque of the drive shaft is
The power is transmitted from the rotor fixed to the drive shaft to the rotating swash plate via a hinge mechanism. A piston is connected to the rotating swash plate via a shoe, and the piston reciprocates in the cylinder bore with the rotational movement of the rotating swash plate.
The sucked refrigerant is compressed, increased in pressure, and discharged. The rotary swash plate is configured to be slidable on the drive shaft and tiltable with respect to the drive shaft. By changing (decreasing or increasing) the pressure in the crank chamber in which the rotary swash plate is housed by the capacity control valve, the tilt angle of the rotary swash plate with respect to the drive shaft is changed, and the stroke amount of the piston and the discharge capacity of the refrigerant are changed. You.

[0003]

In the above-described conventional swash plate type variable displacement compressor, for example, during high-speed operation, the rotating swash plate fluctuates in the axial direction or in the inclined direction with respect to the drive shaft, so that the discharge capacity is reduced. May occur, that is, hunting may occur. Such a phenomenon is particularly remarkable when the cooling requirement is small (at low load) and during high-speed operation. When such a phenomenon occurs, there is a problem that noise vibration (NV) deteriorates and the compression performance of the refrigerant becomes unstable. For example, even if the followability of the capacity control valve and the balance of the rotary swash plate are variously devised, there is a limit in effectively preventing this phenomenon.

Accordingly, the present invention has been made in view of the above points, and an object thereof is to stabilize the behavior of a rotary swash plate with respect to a drive shaft in a variable displacement compressor. It is to provide effective technology.

[0005]

In order to solve the above-mentioned problems, a variable displacement compressor according to the present invention is configured as described in each claim. In the variable displacement compressor, the invention according to these claims preferably regulates the relative movement of the rotary swash plate side member with respect to the drive shaft side member via the relative movement restricting means using frictional force, so that This technology stabilizes the behavior of the rotating swash plate.

In the variable displacement compressor according to the first aspect,
A drive shaft, a rotating swash plate, a hinge mechanism, a piston and the like are provided. The drive shaft is adapted to rotate by a torque transmitted from a vehicle engine via a clutch mechanism, for example. The rotary swash plate has an insertion hole through which the drive shaft is inserted. The rotary swash plate can slide and tilt with respect to the drive shaft while being attached to the drive shaft. The hinge mechanism connects the drive shaft side member and the rotary swash plate side member. The hinge mechanism transmits the rotational torque of the drive shaft to the rotary swash plate while changing the inclination angle of the rotary swash plate with respect to the drive shaft. The “drive shaft side member” in the present invention includes not only the drive shaft itself but also a member fixed to the drive shaft and integrally moving with the drive shaft, for example, a rotor or the like. The "rotating swash plate side member" in the present invention includes not only the rotating swash plate itself but also a member fixed to the rotating swash plate and moving integrally with the rotating swash plate. The piston is housed in the cylinder bore and connected to the rotating swash plate. The piston reciprocates in the cylinder bore with the rotational movement of the rotary swash plate, and performs suction, compression and discharge movement of the refrigerant. Furthermore, the inclination angle of the rotary swash plate with respect to the drive shaft is changed by the relative movement of the rotary swash plate side member with respect to the drive shaft side member via the hinge mechanism, whereby the stroke amount of the piston and the discharge capacity of the refrigerant are reduced. It has been changed. Also,
In the variable displacement compressor according to the first aspect, relative movement restricting means is provided. The relative movement restricting means restricts the relative movement of the rotary swash plate member with respect to the drive shaft side member using frictional force between the drive shaft side member and the rotary swash plate member. The relative movement restricting means may be provided at, for example, a sliding contact portion where the drive shaft side member and the rotary swash plate member are in sliding contact with each other, that is, at a position where the driving shaft side member and the rotating swash plate member are in contact with each other during relative movement. Is also good. For example, relative movement restricting means may be provided between the drive shaft and the outer peripheral surface of the rotary swash plate. The relative movement restricting means positively applies a frictional force that can restrict the relative movement between the drive shaft side member and the rotary swash plate side member. Therefore, it is preferable that the “relative movement restricting means” in the present invention has a function of adjusting the easiness of movement and the difficulty of movement by adjusting the friction between the parts that come into contact with each other during the relative movement. For example, a concave portion and a convex portion that engage with each other are provided, and the relative movement between the drive shaft side member and the rotary swash plate side member is regulated by using a frictional force when the concave portion and the convex portion engage. Can be configured. These concave portions and convex portions may be provided on the drive shaft side member or the rotary swash plate side member itself, or may be provided on another member attached to the drive shaft side member or the rotary swash plate side member. Also, for example, the relative movement between the drive shaft side member and the rotary swash plate side member is restricted by performing a surface treatment on the engaging portions that engage with each other so that the friction resistance of the engaging portion is a predetermined value. Can be configured. Also, for example, by changing the clearance between the engaging portions that engage with each other, and adjusting the frictional resistance acting on this engaging portion,
It is possible to restrict the relative movement between the drive shaft side member and the rotary swash plate side member. The “engaging portion” here may be formed between the drive shaft side member and the rotary swash plate side member, for example, at a position where the drive shaft and the insertion hole of the rotary swash plate abut, or at a hinge mechanism. Alternatively, it may be formed between a member attached to the drive shaft side member and a member attached to the rotary swash plate side member. Thus, by restricting the movement of the rotary swash plate relative to the drive shaft-side member, when the rotary swash plate attempts to move relative to the drive shaft, and when the rotary swash plate relatively moves relative to the drive shaft. In the process, careless movement of the rotary swash plate can be suppressed. Therefore, the behavior of the rotary swash plate with respect to the drive shaft can be stabilized, and so-called hunting can be suppressed. As described above, according to the variable displacement compressor of the first aspect, by providing the relative movement restricting means using the frictional force, the behavior of the rotary swash plate with respect to the drive shaft can be effectively stabilized. it can.

Here, the relative movement restricting means according to claim 1 is preferably constituted by a concave portion and a convex portion which engage with each other as described in claim 2. That is, a concave portion and a convex portion that engage with each other are formed between the drive shaft side member and the rotary swash plate side member. For example, when a concave portion is provided on one member and a convex portion is provided on the other member of the drive shaft side member and the rotating swash plate side member, when a concave portion and a convex portion are provided on one member, a concave portion and a convex portion are provided on both members. May be provided. Further, for example, a concave portion may be provided in one member attached to the drive shaft side member, and a concave portion may be provided in the other member attached to the rotary swash plate side member. For example,
A concave portion is provided on the drive shaft (drive shaft side member), and a convex member (convex portion) having a shape corresponding to the concave portion can be provided in the insertion hole of the rotary swash plate (rotary swash plate side member). Thereby, the movement of the rotary swash plate relative to the drive shaft can be regulated by the frictional force acting between the concave and convex portions engaged with each other, and the behavior of the rotary swash plate can be stabilized. In particular, the movement of the rotary swash plate with respect to the drive shaft can be easily regulated using the frictional force acting between the concave portion and the convex portion. As described above, according to the variable displacement compressor according to claim 2,
By providing a concave portion and a convex portion that engage with each other as relative movement restricting means, the behavior of the rotary swash plate with respect to the drive shaft can be easily and effectively stabilized.

Further, the relative movement restricting means according to the first and second aspects of the present invention provides a predetermined value for the frictional resistance acting on the engaging parts engaging with each other. It is preferable to be configured by performing a surface treatment. That is, a surface treatment capable of obtaining a desired frictional resistance is performed on the engaging portion. The term “surface treatment” as used herein broadly includes paint coating, rubber material or resin material coating, lining, and the like. Preferably, a material that increases frictional resistance is applied to the engaging portion. Coating process can be used. This surface treatment may be applied to only one of the engaging portions engaging with each other,
Alternatively, it may be applied to both. Accordingly, the movement of the rotary swash plate relative to the drive shaft side member is regulated by the frictional resistance due to the surface treatment, and the behavior of the rotary swash plate relative to the drive shaft can be stabilized. In particular, the movement of the rotary swash plate side member with respect to the drive shaft side member can be easily regulated by using the surface treatment of the engaging portion. As described above, according to the variable displacement compressor according to the third aspect, the behavior of the rotary swash plate with respect to the drive shaft is simplified by performing surface treatment on the engaging portions that engage with each other as relative movement restricting means. And it can be stabilized effectively.

Further, the relative movement restricting means according to the second and third aspects further comprises an elastic member for urging the mutually engaging portions in a direction closer to each other. Is preferred. For example, in the variable displacement compressor according to the second aspect, an elastic member that urges the convex portion and the concave portion in a direction in which they approach each other can be provided. With this elastic member, the engaging force between the convex portion and the concave portion engaging with each other, that is, the frictional force between the convex portion and the concave portion is adjusted. Further, in the variable displacement compressor according to the third aspect, it is possible to provide an elastic member which urges the portions subjected to the surface treatment for setting the frictional resistance to a predetermined value in a direction approaching each other. By this elastic member, the frictional force acting on the mutually engaged portions is reliably applied, and the relative movement of the rotary swash plate side member with respect to the drive shaft side member can be reliably restricted. Here, the “elastic member” broadly includes a spring member such as a coil spring and a leaf spring, a rubber member having elasticity, and the like. As described above, according to the variable displacement compressor of the fourth aspect, the behavior of the rotary swash plate with respect to the drive shaft can be easily and reliably stabilized by further using the elastic member.

[0010] In the variable displacement compressor according to claim 5,
The restricting force by the movement restricting means is variable according to the relative position between the drive shaft side member and the rotary swash plate side member. That is, when the relative position between the drive shaft side member and the rotary swash plate side member changes, the restricting force of the movement restricting means changes. For example, when the movement restricting means is configured using the concave portion and the convex portion, the restricting force is changed by changing the range in which the concave portion and the convex portion are provided, or by providing the concave portion and the convex portion in a different engagement state. Can be given.
Further, for example, when the movement restricting means is configured by a surface treatment with a predetermined value of the friction resistance, the regulating force is reduced by changing the surface treatment range or performing a plurality of surface treatments having different friction resistances. You can make a change. Thus, the regulating force can be changed between a position where the behavior of the rotary swash plate is relatively stable and a position where it is difficult to stabilize, without using a complicated control mechanism. As described above, according to the variable displacement compressor according to the fifth aspect, the restricting force is made variable in accordance with the relative position between the drive shaft side member and the rotary swash plate side member, so that the rotational inclination with respect to the drive shaft is reduced. The movement of the board can be regulated rationally.

Here, the relative movement restricting means according to the first to fifth aspects is provided between at least one of the drive mechanism and the insertion hole and at least one of the hinge mechanisms. preferable. In other words, the relative movement restricting means may be provided in one of the space between the drive shaft and the insertion hole and in the hinge mechanism, or may be provided in both. Thereby, the behavior of the rotary swash plate with respect to the drive shaft can be effectively stabilized.

[0012] In the variable displacement compressor according to claim 7,
The hinge mechanism includes a pin member and a support hole. The pin member is provided on one of the rotor member and the rotating swash plate, and the support hole is provided on a member opposite to the pin member. For example, there is a case where a pin member is provided on a rotary swash plate and a support hole is provided on a rotor member, and a case where a pin member is provided on a rotor member and a support hole is provided on a rotary swash plate. The rotor member is fixed to the drive shaft so as to rotate integrally with the drive shaft. That is, the drive shaft side member and the rotary swash plate member move relatively with respect to this hinge mechanism. This makes it possible to provide a structure in which the relative movement restricting means is provided in the hinge mechanism having the pin member and the support hole.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to third embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a swash plate type variable displacement compressor for air-conditioning a vehicle that compresses suction refrigerant to increase pressure and discharge the same will be described.

First Embodiment First, the configuration and the like of a swash plate type variable displacement compressor according to a first embodiment will be described with reference to FIG. Here, FIG. 1 is a longitudinal sectional view of the swash plate type variable displacement compressor 100 of the first embodiment.

As shown in FIG. 1, a swash plate type variable displacement compressor (hereinafter referred to as "compressor") 100 has a cylinder block 1 and a front end fastened to the front end (left side in the figure) of the cylinder block 1. The housing 2 includes a rear housing 5 fastened via a valve plate 6 to a rear end (right side in the drawing) of the cylinder block 1. Rear housing 5
Has a suction chamber 3 for sucking the refrigerant, and a discharge chamber 4 for discharging the compressed refrigerant sucked from the suction chamber 3 and compressed. The valve plate 6 has a suction port 3 a for communicating the suction chamber 3 with the cylinder bore 1 a via a suction valve 3 b, and a discharge valve 4.
A discharge port 4a and the like are provided for communicating the discharge chamber 4 with the cylinder bore 1a through the b. The valve plate 6 is provided with a bleed passage 16 that communicates the crank chamber 9 and the suction chamber 3 in the front housing 2.

A drive shaft 8 connected to a vehicle engine as an external drive source via a clutch mechanism (not shown) such as an electromagnetic clutch is inserted through the cylinder block 1 and the front housing 2. Therefore, the drive shaft 8 is rotationally driven via the clutch mechanism when the vehicle engine is started. The drive shaft 8 is rotatably supported by bearing mechanisms provided on the cylinder block 1 and the front housing 2.

In the crank chamber 9, a disk-shaped rotary swash plate 11 is provided.
Is housed. The rotary swash plate 11 has an insertion hole 12 at the center thereof, and the drive shaft 8 is inserted through the insertion hole 12. Further, the rotating swash plate 11 is provided with a pin member 13 having a spherical portion 13a at the tip at two places on the side opposite to the cylinder block 1. The drive shaft 8 includes
The rotor 30 that rotates integrally with the rotor 30 is fixed. The rotor 30 has a circular turntable 31 and the turntable 3
1 includes a support arm 32, a balance weight portion 33, and the like. The rotary disk 31 is provided with an insertion hole 30a into which the drive shaft 8 is inserted.

The rotor 30 is connected to the rotary swash plate 11 via a hinge mechanism 20. That is, rotor 3
0 support arm 32 and the pin member 1 on the rotary swash plate 11 side.
The hinge mechanism 20 is constituted by an engagement structure with which the hinge mechanism 3 engages. The support arm 32 has a support hole 32 a having a shape corresponding to the spherical portion 13 a of the pin member 13. The support arm 32 supports the pin member 13 while the spherical portion 13a of the pin member 13 is inserted into the support hole 32a, and the pin member 13 is slidable in the support hole 32a. Accordingly, the hinge mechanism 20 transmits the rotational torque of the drive shaft 8 to the rotary swash plate 11 while the support arm 32 and the pin member 13 are engaged, while the rotary swash plate 1
1 can be tilted. That is, the rotary swash plate 11 is slidable and tiltable with respect to the drive shaft 8.

A thrust bearing 40 is provided between the rotor 30 and the front housing 2 so as to contact the front surface of the turntable 31. The compression reaction force generated by the reciprocating movement of the piston 15 is received by the front housing 2 via the piston 15, the shoe 14, the rotating swash plate 11, the hinge mechanism 20, and the thrust bearing 40.

The cylinder block 1 is provided with a predetermined number of cylinder bores 1a arranged at predetermined intervals in the circumferential direction. Each cylinder bore 1a has a piston 1
5 are slidably accommodated. The rear side of the piston 15 is connected to the rotary swash plate 11 via the shoe 14. Accordingly, when the rotating swash plate 11 rotates with the rotation of the drive shaft 8, each piston 1
Numeral 5 is configured to reciprocate in each cylinder bore 1a. As the piston 15 reciprocates in this manner, for example, the refrigerant is sucked into the cylinder bore that performs the suction process, and the compressed and high-pressure compressed refrigerant is discharged from the cylinder bore that performs the discharge process.

The displacement of the compressor 100 is determined by the piston 15
(The distance from the top dead center to the bottom dead center of the piston), and the stroke of the piston 15 is determined by the inclination angle of the rotary swash plate 11. That is, the larger the inclination angle θ of the rotary swash plate 11 with respect to the axis L of the drive shaft, the larger the stroke amount and discharge capacity of the piston 15.
Is smaller, the stroke amount and the discharge capacity of the piston 15 are smaller. The inclination angle θ of the rotary swash plate 11 during operation is determined by the pressure difference between the cylinder bore 1 a and the crank chamber 9, and the pressure difference is adjusted by the displacement control valve 18. FIG. 1 shows a state in which the inclination angle θ of the rotary swash plate 11 is small, that is, a state in which the discharge capacity is low and the load is low.

The displacement control valve 18 extends from the cylinder block 1 to the rear housing 5 and is provided in an air supply passage 17 that connects the discharge chamber 4 to the crank chamber 9. The capacity control valve 18 is an electromagnetic valve, and the opening degree of the air supply passage 17 is adjusted by the capacity control valve 18. By adjusting the opening degree of the air supply passage 17, the crank chamber 9 is adjusted.
Is changed, and the pressure difference between the pressure in the cylinder bore 1a and the pressure in the crank chamber 9 is adjusted. As a result, the inclination angle θ of the rotary swash plate 11 with respect to the drive shaft 8 is changed,
The stroke amount of the piston 15 is changed, and the discharge capacity is adjusted.

A spring accommodating portion 11 a for accommodating the coil spring 10 is provided in the insertion hole 12 of the rotary swash plate 11.
An engagement member 10 is provided at the drive shaft side end of the coil spring 10.
a is attached. The coil spring 10 corresponds to the elastic member according to the present invention, and the engaging member 10a corresponds to the protrusion according to the present invention. On the other hand, a recess 8b having a shape corresponding to the engagement member 10a is provided at a position on the outer peripheral surface 8a of the drive shaft 8 facing the engagement member 10a. In the present embodiment, concave portions 8b are formed at three places on the outer peripheral surface 8a of the drive shaft 8. The engaging member 10a and the recess 8b engage with each other.

The coil spring 10 elastically urges the engaging member 10a fitted in the recess 8b in the direction of the recess 8b. That is, this coil spring 10
Are designed to urge the engaging member 10a and the concave portion 8b to be engaged in directions approaching each other. This allows
The engaging member 10a engaging with the concave portion 8b is further pressed by the coil spring 10. When the rotary swash plate 11 is to move relative to the drive shaft 8, the frictional force acting between the recess 8b and the engaging member 10a is further increased by the coil spring 10. In this manner, the rotation swash plate 11 can be prevented from inadvertently wobbling with respect to the drive shaft 8, and the behavior of the rotation swash plate 11 can be stabilized.
In the process of rotating the swash plate 11 relative to the drive shaft 8, the engaging member 10 a is appropriately operated in the longitudinal direction of the coil spring 10 in accordance with the uneven shape of the drive shaft 8, so that the swash plate is rotated. 11 can be stabilized. In this manner, when the rotary swash plate 11 is about to move relative to the drive shaft 8 and during the process in which the rotary swash plate 11 is relatively moving relative to the drive shaft 8, the rotary swash plate 11 is not moved. It can be prevented from moving easily. The engaging member 10a and the recess 8b with which the engaging member 10a engages
Is preferably provided at a place where the insertion hole 12 and the drive shaft 8 always contact, or at a place where the insertion hole 12 and the drive shaft 8 contact more strongly. With this configuration, the relative movement of the rotary swash plate 11 with respect to the drive shaft 8 can be more effectively restricted. Recess 8b on drive shaft 8 side, insertion hole 1
The relative movement restricting means in the present invention is constituted by the coil spring 10 on the second side, the engaging member 10a, and the like. Note that, instead of the coil spring of the present embodiment, a spring member such as a leaf spring, a rubber member having elasticity, or the like can be used.

In the present embodiment, when the load is low as shown in FIG. 1 (when the tilt angle θ of the rotary swash plate 11 is small), the engaging member 10a is connected to the lowest load side among the three concave portions of the drive shaft 8. (The rightmost concave portion in FIG. 1). Thereby, especially at the time of a low load in which the cooling requirement is small, it is possible to suppress the phenomenon that the rotation swash plate 11 wobbles in the axial direction or the inclination direction with respect to the drive shaft 8 to change the discharge capacity, that is, so-called hunting. The engaging member 10a sequentially engages with the remaining two concave portions as the rotating swash plate 11 moves toward the high load side. In the present embodiment, the configuration is described in which the engaging member 10a and the concave portion 8b are engaged particularly at a position corresponding to the rotating swash plate 11 at a low load, but the engaging member 10a and the concave portion 8b are engaged. The range is not limited to this, and can be variously changed as needed. For example, the engaging member 10a and the recess 8b may be configured to engage with each other at a position corresponding to the entire capacity from a low load to a high load, or a position corresponding to the rotating swash plate 11 under a high load. May be configured so that the engaging member 10a and the recess 8b are engaged.

As described above, according to the first embodiment,
The engaging member 10a on the side of the rotary swash plate 11 is
With a simple configuration that fits in b, the relative movement of the rotary swash plate 11 with respect to the drive shaft 8 can be restricted, and the behavior of the rotary swash plate 11 can be stabilized. Further, the engagement member 1
Since the coil spring 10 for elastically biasing the rotation swash plate 11 in the direction of the recess 8b is provided, the behavior of the rotary swash plate 11 can be more reliably stabilized.

[Second Embodiment] Next, the configuration and the like of a swash plate type variable displacement compressor according to a second embodiment will be described with reference to FIG. Here, FIG. 2 is a longitudinal sectional view schematically showing a main part of a swash plate type variable displacement compressor 200 according to the second embodiment. Note that the main configuration and the like of the compressor 200 are the same as those of the compressor 100 of the first embodiment.
Only parts different from the embodiment will be described. Also,
2, the same elements as those shown in FIG. 1 are denoted by the same reference numerals.

In the compressor 200 shown in FIG.
A projection 12a is formed in one insertion hole 12. The convex portion 12a and the outer peripheral surface 8a of the drive shaft 8 that engages (contacts) with the convex portion 12a are provided with a surface treatment that increases frictional resistance as compared with other portions, that is, rotation with respect to the drive shaft 8. A coating process of applying a material that restricts the relative movement of the swash plate 11 is performed. As a result of this coating process, the convex portion 12a and the outer peripheral surface 8a are in a coarser state than other portions. Accordingly, when the rotary swash plate 11 is about to move relative to the drive shaft 8, the operation of the rotary swash plate 11 is regulated by the frictional resistance of the portion where the coating process is performed. Therefore, when the rotary swash plate 11 is about to move relative to the drive shaft 8 and during the process in which the rotary swash plate 11 is relatively moving with respect to the drive shaft 8, the rotary swash plate 11 is inadvertently wobble. And the behavior of the rotary swash plate 11 can be stabilized. Note that the projection 12a of the insertion hole 12 and the outer peripheral surface 8a of the drive shaft 8 constitute an engagement portion in the present invention. Also, the convex portion 1
Painting treatment (surface treatment) applied to 2a and outer peripheral surface 8a
The relative movement restricting means of the present invention is constituted by the above.

As described above, according to the second embodiment,
The relative movement of the rotary swash plate 11 with respect to the drive shaft 8 is restricted by applying a coating process (surface treatment) on the convex portion 12a and the outer peripheral surface 8a that engage with each other so as to increase frictional resistance. Can be stabilized.

The above surface treatment may be applied to only one of the convex portion 12a and the outer peripheral surface 8a. Further, the same treatment as the above surface treatment can be applied to the hinge mechanism 20, for example, the spherical portion 13 a of the pin member 13 and the support hole 32 a of the support arm 32. In this case, the relative movement of the pin member 13 which is the rotary swash plate side member with respect to the support arm 32 which is the drive shaft side member is restricted. That is, the relative movement of the rotary swash plate 11 with respect to the drive shaft 8 is indirectly restricted. Such surface treatment is performed between the spherical portion 13a and the support hole 32a, the convex portion 12a.
May be carried out both between the outer peripheral surface 8a and
Or you may implement in either one.

[Third Embodiment] Next, the configuration and the like of a swash plate type variable displacement compressor according to a third embodiment will be described with reference to FIGS. Here, FIG. 3 is a sectional view schematically showing a main part of a swash plate type variable displacement compressor 300 according to the third embodiment. FIG. 4 is a partially enlarged view showing the hinge mechanism 60 in FIG. FIG. 5 is a sectional view taken along line VV in FIG. The main configuration and the like of the compressor 300 are the same as those of the compressor 100 of the first embodiment, and therefore, only the portions different from the first embodiment, that is, the configuration of the hinge mechanism will be described. 2, the same elements as those shown in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 3 and FIG.
Numeral 0 is provided with swing arms 19 at two positions on the side of the rotary swash plate 11 opposite to the cylinder block 1. The swing arm 19 extends toward the rotor 30, and a guide pin 19 a is press-fitted and fixed to the tip of the swing arm 19. On the other hand, a support arm 34 is attached to the turntable 31 of the rotor 30. The rotor 30 is connected to the rotary swash plate 11 via a hinge mechanism 60. That is, the rotor 30
The hinge mechanism 60 is configured by an engagement structure in which the support arm 34 on the side and the swing arm 19 on the side of the rotary swash plate 11 are engaged. The support arm 34 is a swing arm 1
A support hole 34a having a shape corresponding to the guide pin 19a on the ninth side
have. Then, the guide pin 19a is
a, the support arm 34 is inserted into the guide pin 1
9a while supporting the guide pin 19a with the support hole 34a.
It is slidable inside. This guide pin 19a corresponds to the pin member in the present invention. Therefore, the hinge mechanism 60 includes the support arm 34 and the swing arm 19.
In the state in which the rotational swash plate 11 is engaged, the rotational torque of the drive shaft 8 is transmitted to the rotational swash plate 11, and the rotational swash plate 11 can be tilted. That is, the rotary swash plate 11 is slidable and tiltable with respect to the drive shaft 8.

As shown in FIG. 5, the swing arm 19 on the side of the rotary swash plate 11 is provided with a spring accommodating portion 19b for accommodating a coil spring 35. An engagement member 35a is attached to an end of the coil spring 35 on the support arm side. The coil spring 35 corresponds to the elastic member according to the present invention, and the engaging member 35a corresponds to the convex portion according to the present invention. On the other hand, a plurality (four in FIG. 5) of recesses 34b having a shape corresponding to the engagement member 35a are provided at positions on the support arm 34 facing the engagement member 35a. The engaging member 35a and the concave portion 34b engage with each other.

The coil spring 35 resiliently urges the engagement member 35a fitted in the predetermined recess 34b in the direction of the recess 34b. That is, the coil spring 35 includes an engaging member 35a to be engaged and a concave portion 34b.
Are urged in directions approaching each other. Thus, the engaging member 35a that engages with the concave portion 34b is further pressed by the coil spring 35. When the rotary swash plate 11 is to move relative to the drive shaft 8, the frictional force acting between the recess 34b and the engaging member 35a is further increased by the coil spring 35. In this manner, the rotation swash plate 11 can be prevented from inadvertently wobbling with respect to the drive shaft 8, and the behavior of the rotation swash plate 11 can be stabilized. In the process of rotating the swash plate 11 relative to the drive shaft 8, the engaging member 35 a
The operation of the rotary swash plate 11 can be stabilized by appropriately operating in the longitudinal direction of the coil spring 35 according to the irregular shape of the coil spring 35. In this manner, when the rotary swash plate 11 is about to move relative to the drive shaft 8, and when the rotary swash plate 11
In the process of moving relative to the drive shaft 8, careless movement of the rotary swash plate 11 can be suppressed. The concave portion 34b on the support arm 34 side, the coil spring 35 on the swing arm 19 side, the engaging member 35a, and the like constitute a relative movement restricting means in the present invention.
Note that, instead of the coil spring of the present embodiment, a spring member such as a leaf spring, a rubber member having elasticity, or the like can be used.

As described above, according to the third embodiment,
The engaging member 35a on the rotary swash plate 11 side is the
With a simple configuration that fits into the 4b, the relative movement of the rotary swash plate 11 with respect to the drive shaft 8 can be restricted, and the behavior of the rotary swash plate 11 can be stabilized. Further, the coil spring 3 further elastically urges the engagement member 35a in the direction of the recess 34b.
Since the swash plate 11 is provided, the behavior of the rotary swash plate 11 can be more reliably stabilized.

It should be noted that the present invention is not limited to only the above-described embodiment, and various applications and modifications are conceivable. For example, each of the following embodiments to which the above embodiment is applied may be implemented.

(A) In the first and third embodiments, the drive shaft 8 is formed by using the friction acting between the concave portion and the convex portion.
The case of stabilizing the behavior of the rotary swash plate 11 with respect to the above has been described. Further, in the second embodiment, the coating process (surface treatment) for increasing the frictional resistance between the engaging portions engaging with each other.
Has been described, the behavior of the rotary swash plate 11 with respect to the drive shaft 8 is stabilized by performing the above operation. Instead of the present embodiment, for example, the relative movement between the two members may be regulated by changing the clearance between the engaging portions engaged with each other and adjusting the frictional resistance between the two members. Further, a plurality of these means for restricting relative movement may be used in combination.

(B) In the above embodiment, the hinge mechanism 2 is provided between the drive shaft 8 and the insertion hole 12 of the rotary swash plate 11.
The case where the relative movement restricting means for restricting the relative movement of the rotary swash plate 11 with respect to the drive shaft 8 is described at 0, 60 is provided. However, the location where the relative movement restricting means is provided is not limited. For example, an engagement member that engages with the drive shaft 8 is attached to the outer peripheral surface of the rotary swash plate 11, and the frictional force that acts between the engagement member and the drive shaft 8 is appropriately adjusted, so that the drive shaft 8
It is also possible to restrict the relative movement of the rotary swash plate 11 with respect to. Further, the present invention can be applied to a compressor having an engagement structure other than the present embodiment.

(C) In the first embodiment, the recess 8b is provided on the drive shaft 8 side, and the recess 8b is provided on the rotary swash plate 11 side.
Although the case where the engagement member 10a and the coil spring 10 which engage with the swash plate 11 are accommodated has been described,
b may be provided to accommodate the engagement member 10a and the coil spring 10 on the drive shaft 8 side. Also,
In the third embodiment, the support arm 34 has the concave portion 34b
And the swing arm 19 accommodates the engagement member 35a and the coil spring 35 that engage with the recess 34b. However, the swing arm 19 is provided with the recess 34b, and the support arm 34 includes the engagement member 35a and the coil spring 35. 35 may be configured.

(D) In the first embodiment, the pin member 13 is provided on the rotating swash plate 11 side, and the support arm 32 on the drive shaft 8 side supports the pin hole 13a.
Has been described. Further, in the third embodiment, the guide pin 19a (pin member) is provided on the rotary swash plate 11 side, and the support arm 34 on the drive shaft 8 side is provided with the support hole 34a for supporting the guide pin 19a (pin member). The case of providing is described. Instead of such a configuration, a pin member may be provided on the drive shaft 8 side, and a support hole for supporting the pin member may be provided on the rotary swash plate 11 side.

(E) In the third embodiment, the relative movement of the rotary swash plate 11 with respect to the drive shaft 8 is controlled by fitting the engaging member 35a elastically biased by the coil spring 35 into the concave portion 34b. I mentioned about the case of regulation,
A leaf spring can be used instead of the coil spring 35 and the engagement member 35a. An embodiment using this leaf spring will be described with reference to FIG. Here, FIG. 6 is a sectional view showing another embodiment different from the embodiment shown in FIG. In FIG. 6, the same elements as those shown in FIG. 5 are denoted by the same reference numerals. As shown in FIG. 6, a leaf spring 36 is accommodated in a spring accommodating portion 19b provided on the swing arm 19 on the side of the rotary swash plate 11. The leaf spring 36 has a shape having a convex portion 36a. On the other hand, a plurality (four in FIG. 6) provided on the support arm 34
The concave portion 34b has a shape corresponding to the convex portion 36a of the leaf spring 36. Accordingly, this convex portion 36a is
, The movement of the swing arm 19 with respect to the support arm 34 is restricted, and the relative movement of the rotary swash plate 11 with respect to the drive shaft 8 is restricted. That is, when the rotary swash plate 11 attempts to move relative to the drive shaft 8, a frictional force acts between the convex portion 36 a and the concave portion 34 b of the leaf spring 36. Inadvertent wobbling can be suppressed, and the behavior of the rotary swash plate 11 can be stabilized. When the rotary swash plate 11 moves relative to the drive shaft 8, the convex portion 36a is pressed, and the leaf spring 36 itself is slightly expanded in the spring accommodating portion 19b against the elastic urging force. In the third embodiment, the engagement member 35 is used.
When a centrifugal force acts on a, the relative position between the engaging member 35a and the concave portion 34b changes due to the effect of the centrifugal force, but the convex portion 36a of the leaf spring 36 directly fits into the concave portion 34b as shown in FIG. With the configuration, it is possible to reduce the influence of such a centrifugal force. Support arm 3
The concave portion 34b on the fourth side and the convex portion 36a of the leaf spring 36 constitute a relative movement restricting means in the present invention.
In this embodiment, the case where the leaf spring 36 is provided on the swing arm 19 side has been described.
6 can be provided on the support arm 34 side.

[0042]

As described above, according to the present invention,
In the variable displacement compressor, a technique effective for stabilizing the behavior of the rotary swash plate with respect to the drive shaft can be realized.

[Brief description of the drawings]

FIG. 1 is a swash plate type variable displacement compressor 100 according to a first embodiment.
FIG.

FIG. 2 shows a swash plate type variable displacement compressor 200 according to a second embodiment.
FIG. 2 is a longitudinal sectional view schematically showing a main part of FIG.

FIG. 3 is a swash plate type variable displacement compressor 300 according to a third embodiment;
FIG. 2 is a longitudinal sectional view schematically showing a main part of FIG.

FIG. 4 is a partially enlarged view showing a hinge mechanism 60 in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a cross-sectional view showing another embodiment different from the embodiment shown in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylinder block 2 ... Front housing 8 ... Drive shaft, 8a ... Outer peripheral surface, 8b, 34b ... Concave part 9 ... Crank chamber 10, 35 ... Coil spring, 10a, 35a ... Engaging member 11 ... Rotating swash plate, 11a ... Spring Storage section 12: insertion hole, 12a: convex section 13: pin member, 13a: spherical section 19: swing arm, 19a: guide pin, 19b ...
Spring storage part 20, 60 Hinge mechanism 30 Rotor 32, 34 Support arm, 32a, 34a Support hole 36 Leaf spring, 36a Projection 100, 200, 300 (Swash plate type variable capacity) compressor

Continued on the front page (72) Inventor Tomoji Tarutani 2-1-1 Toyota-cho, Kariya-shi, Aichi F-term in Toyota Industries Corporation (reference) 3H076 AA06 BB43 BB50 CC36 CC99

Claims (7)

[Claims] 1. A drive shaft, a rotary swash plate attached to the drive shaft via an insertion hole, a hinge mechanism for connecting a drive shaft side member and a rotary swash plate side member, and a cylinder bore via the rotary swash plate. A piston that reciprocates in the inside, and the tilt angle of the rotary swash plate with respect to the drive shaft is changed by the rotary swash plate side member relatively moving with respect to the drive shaft side member via the hinge mechanism. A variable displacement compressor in which a stroke amount of the piston and a discharge capacity of the refrigerant are changed, wherein a frictional force is applied to the drive shaft side member between the drive shaft side member and the rotary swash plate member. A variable displacement compressor provided with relative movement restricting means for restricting the relative movement of the rotary swash plate member with respect to. 2. The variable displacement compressor according to claim 1, wherein the relative movement restricting means includes a concave portion and a convex portion that engage with each other. 3. The variable displacement compressor according to claim 1, wherein said relative movement restricting means includes a pair of engaging portions which engage with each other, and a frictional resistance of said engaging portion is set to a predetermined value. A variable capacity compressor characterized by being subjected to processing. 4. The variable displacement compressor according to claim 2, wherein the relative movement restricting means further includes an elastic member for urging the engaging portions to approach each other. A variable capacity compressor characterized by the following. 5. The variable displacement compressor according to claim 1, wherein the restricting force by said relative movement restricting means is a relative position between said drive shaft side member and said rotary swash plate side member. A variable displacement compressor characterized by being variable according to the following. 6. The variable displacement compressor according to claim 1, wherein the relative movement restricting means is at least one of a portion between the drive shaft and the insertion hole and the hinge mechanism. A variable displacement compressor characterized by being provided in a compressor. 7. The variable displacement compressor according to claim 6, wherein the hinge mechanism is a pin provided on one of a rotor member fixed to the drive shaft and the rotating swash plate. A variable displacement compressor comprising a member and a support hole provided in the other member for supporting the pin member.