JP2020122465A - Oscillatory plate type variable displacement compressor - Google Patents

Abstract

To improve assemblability of a rotation stopping mechanism which stops an oscillatory plate from rotating in an oscillatory plate type variable displacement compressor.SOLUTION: In a rotation stopping mechanism 30, an outer peripheral surface 311 of an inner ring 31 is formed into such a convex surface that a cross-sectional shape cut with a plane containing a center line L2 of the inner ring 31 is convex radially outward, and an inner ring ball groove 312 extends in parallel with the center line L2. An inner peripheral surface 322 of an outer ring 32 includes a rotor side cylindrical inner peripheral surface 322a and a piston-side diameter-reduced inner peripheral surface 322b of the cylindrical inner peripheral surface 322a, and an outer ring ball groove 325 extends in parallel with a center line L5 of the outer ring 32. An inner peripheral surface 343 of a retainer 34 is formed into a curved surface along the outer peripheral surface 311 of the inner ring 31, an outer peripheral surface 342 of the retainer 34 is formed into a curved surface along the diameter-reduced inner peripheral surface 322b of the outer ring 32, and a fall stopper member 35 is fitted at a position which is more on a rotor side than the cylindrical inner peripheral surface 322a of the outer ring 32.SELECTED DRAWING: Figure 3

Description

The present invention relates to a swash plate that rotates together with a rotating main shaft and can change an inclination angle with respect to an axis of the rotating main shaft, and a swing plate that is connected to a piston and swings by rotation of the swash plate to reciprocate the piston. And a swing plate type variable displacement compressor in which the stroke of the piston changes according to the tilt angle of the swash plate and the discharge capacity changes.

Patent Document 1 describes an example of this type of oscillating plate type variable displacement compressor. The oscillating plate type variable displacement compressor described in Patent Document 1 includes a rotation blocking mechanism that blocks the rotation of the oscillating plate. The rotation prevention mechanism has an inner ring, a sleeve, an outer ring, and a plurality of balls. The inner ring is provided in the housing so as to be prevented from rotating but movable in the axial direction, and supports the rotating main shaft in the inner diameter portion via a bearing so as to be relatively rotatable and relatively movable in the axial direction. It has a plurality of guide grooves for guiding the ball. The sleeve functions as a swing center member of the swing motion of the swing plate, is provided on the rotary spindle so as to be rotatable relative to the rotary spindle and movable in the axial direction, and is movable in the axial direction together with the inner ring. Is engaged with the inner ring. The outer ring has a plurality of guide grooves, each of which guides the ball, is swingably supported by the sleeve, and fixedly supports the swing plate on the outer periphery and allows the swash plate to rotate via a bearing. To support.

Japanese Patent No. 4829761

In the rotation blocking mechanism of the oscillating plate type variable displacement compressor described in Patent Document 1, the guide grooves of the inner ring and the outer ring facing each other form a relative angle of 30 to 60° with respect to the central axis of the rotating main shaft. And a symmetrical shape with respect to a plane that is formed perpendicularly to the main axis of rotation and that passes through the swing center of the swing plate in a state where the opposed guide grooves have a relative angle between the inner ring and the outer ring of zero. The ball is supported on the intersection of the axis of the guide groove of the inner ring and the axis of the guide groove of the outer ring. Therefore, it is not easy to assemble the rotation blocking mechanism, and there is room for improvement in this respect.

Therefore, it is an object of the present invention to provide an oscillating plate type variable displacement compressor capable of improving the assemblability of a rotation preventing mechanism that prevents the oscillating plate from rotating.

According to one aspect of the present invention, a housing, a rotating main shaft rotatably supported by the housing, a rotor fixed to the rotating main shaft and rotating with the rotating main shaft, and a rotor connected to the rotor via a connecting mechanism. A swash plate that rotates together with the rotation main shaft and that can change an inclination angle with respect to the rotation main shaft; a swash plate that is connected to a piston and oscillates by the rotation of the swash plate to reciprocate the piston; An oscillating plate type variable displacement compressor including a rotation blocking mechanism that blocks the rotation of the plate is provided. In the oscillating plate type variable displacement compressor, the rotation preventing mechanism is provided so as to be axially movable on the rotation main shaft in a state where rotation is blocked, and an inner ring having a plurality of inner ring ball grooves formed on an outer peripheral surface thereof. And an outer ring disposed outside the inner ring, wherein the swing plate is fixed to an outer peripheral surface and a plurality of outer ring ball grooves facing the plurality of inner ring ball grooves is formed on an inner peripheral surface. A plurality of balls each rotatably held by the inner ring ball groove and the outer ring ball groove facing each other, and a retainer arranged between the inner ring and the outer ring, wherein The retainer includes a plurality of ball accommodating portions that accommodate any of them, and a retaining member that is attached to the outer ring to prevent the retainer from falling off. Each of the plurality of inner ring ball grooves extends parallel to the center line of the inner ring, and each of the plurality of outer ring ball grooves extends parallel to the center line of the outer ring. The outer peripheral surface of the inner ring is formed as a convex curved surface whose cross-sectional shape cut along a plane including the center line of the inner ring is convex in the radial direction, and the inner peripheral surface of the outer ring is arranged on the rotor side. A cylindrical inner peripheral surface, and a reduced diameter inner peripheral surface that is arranged on the piston side and gradually reduces in diameter from the same diameter as the cylindrical inner peripheral surface as the distance from the cylindrical inner peripheral surface increases. The inner peripheral surface of the container is formed as a curved surface along the outer peripheral surface of the inner ring, and the outer peripheral surface of the retainer is formed as a curved surface along the reduced diameter inner peripheral surface of the outer ring. The member is attached to a position closer to the rotor than the cylindrical inner peripheral surface of the outer ring.

According to the oscillating plate type variable displacement compressor, the cage in a state where the plurality of balls are accommodated in the plurality of ball accommodating portions is assembled from the rotor side between the inner ring and the outer ring, and then, A retaining member can be attached. Therefore, the rotation blocking mechanism is relatively easy to assemble, and the assembling property of the rotation blocking mechanism that blocks the rotation of the rocking plate can be improved as compared with the related art.

It is a sectional view showing a schematic structure of an oscillating plate type variable capacity compressor concerning one embodiment of the present invention. It is a principal part enlarged view of FIG. FIG. 3 is an exploded perspective view of a rotation blocking mechanism that blocks the rotation of the oscillating plate of the oscillating plate variable displacement compressor. It is a figure which shows the coupling|bonding body of the shaft support member which supports the one end side (rear side) of the rotation main shaft of the said oscillating plate type variable displacement compressor, and the inner ring which comprises the said rotation prevention mechanism, (A) is a coupling body. It is a front view, (B) is a side view of a combined body, (C) is an AA sectional view of (A). It is a figure which shows the outer ring which comprises the said rotation prevention mechanism, (A) is a front view of an outer ring, (B) is a side view of an outer ring, and is BB sectional drawing of (A). It is a figure which shows the cage which comprises the said rotation prevention mechanism, (A) is a front view of a cage, (B) is a side view of a cage, (C) is a rear view of a cage. , (D) are sectional views taken along line CC of (A). It is a figure which shows the retainer member which prevents the fall of the said retainer, (A) is a front view of a retainer member, (B) is a DD sectional view of (A).

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a sectional view showing a schematic configuration of an oscillating plate type variable displacement compressor 1 according to an embodiment of the present invention. The oscillating plate type variable displacement compressor 1 according to the embodiment has a cylinder block 2 having a center bore 2a and a plurality of cylinder bores 2b arranged so as to surround the center bore 2a, and a front end provided at one end (front side) of the cylinder block 2. It includes a housing 3 and a cylinder head 4 provided at the other end (rear side) of the cylinder block 2. The cylinder block 2, the front housing 3, and the cylinder head 4 are fastened together by bolts or the like to form a housing of the oscillating plate type variable displacement compressor 1. A valve plate 5 is arranged between the cylinder block 2 and the cylinder head 4. A crank chamber C1 is formed by the cylinder block 2 and the front housing 3 in the housing, and the center bore 2a is cut off more than the front side bore portion 2a1 and the front side bore portion 2a1 which are open to the crank chamber C1. It includes a rear side bore portion 2a2 having a small area and opening to the bottom surface of the front side bore portion 2a1.

A discharge chamber C2 and a suction chamber C3 are formed in the cylinder head 4. The discharge chamber C2 is formed substantially in the center of the cylinder head 4, and the suction chamber C3 is formed so as to surround the discharge chamber C2. The discharge chamber C2 is connected to, for example, the refrigerant circuit (high pressure side) of the air conditioning system via a discharge passage (not shown), and the suction chamber C3 is connected to the refrigerant circuit (low pressure side) via the suction passage (not shown). It is connected. Further, the discharge chamber C2 communicates with each cylinder bore 2b through a discharge hole 51 and a discharge valve 52 formed in the valve plate 5, and a suction chamber C3 has a suction hole 53 and a suction valve (shown in the figure) formed in the valve plate 5. (Omitted) to communicate with each cylinder bore 2b.

Further, the oscillating plate type variable displacement compressor 1 has a rotary main shaft 6 to which a rotary driving force is input from the outside. The rotary main shaft 6 extends through the crank chamber C1 from the front side to the rear side. The rotary main shaft 6 is supported on the front side (left side in FIG. 1) via a bearing (slide bearing) 21 provided in the front housing 3, and on the rear side (right side in FIG. 1) the front bore portion 2a1 of the center bore 2a. It is supported via a shaft support member 7 inserted in the shaft support member 7 and a bearing (slide bearing) 22 provided on the shaft support member 7. That is, the rotary main shaft 6 is rotatably supported by the housing. The rear side of the rotary main shaft 6 may be supported, for example, through a bearing provided in the rear side bore portion 2a2 of the center bore 2a instead of the shaft support member 7 and the bearing 22.

The shaft support member 7 is inserted into the front bore portion 2a1 of the center bore 2a so as to be axially movable while being prevented from rotating. Specifically, in the present embodiment, the shaft support member 7 is formed in a polygonal column shape (here, a triangular column shape, see FIGS. 3 and 4 described later), and the front side bore portion 2a1 of the center bore 2a supports the shaft. It is formed as a polygonal columnar hole (triangular columnar hole) corresponding to the member 7, and the shaft support member 7 is axially movable (sliding) to the front side bore portion 2a1 of the center bore 2a in a state where rotation is blocked. Has been inserted into. However, it is not limited to this. For example, the shaft support member 7 is formed in a cylindrical shape, the front side bore portion 2a1 of the center bore 2a is formed as a cylindrical hole, and the shaft support member 7 and the front side bore portion 2a1 of the center bore 2a are splined. By doing so, the shaft support member 7 may be axially movably inserted into the front bore portion 2a1 of the center bore 2a in a state in which the shaft support member 7 is prevented from rotating.

In the crank chamber C1, a rotor 8, a swash plate 9, and a swing plate 10 are arranged in order from the front side to the rear side. Each of the rotor 8, the swash plate 9, and the oscillating plate 10 is formed in a substantially disc shape.

The rotor 8 is fixed to the rotating main shaft 6 and rotates together with the rotating main shaft 6. A thrust bearing 23 is provided between the rotor 8 and the front housing 3.

The swash plate 9 is connected to the rotor 8 via a connecting mechanism (link mechanism) 11, is configured to rotate together with the rotating main shaft 6 (and the rotor 8), and the inclination angle of the rotating main shaft 6 with respect to the axis L1 can be changed. ing. Specifically, in the present embodiment, the swash plate 9 is changed from a state of being substantially orthogonal to the axis L1 of the rotating main shaft 6 (minimum inclination angle) to a state of being in contact with the rotor 8 shown in FIG. 1 (maximum inclination angle). The tilt angle can be changed.

The oscillating plate 10 is connected via a connecting rod 12 to a piston 13 reciprocally inserted into each of the plurality of cylinder bores 2b. The swing plate 10 is supported so as to swing by the rotation of the swash plate 9 in a state where the rotation is blocked by the rotation blocking mechanism 30. The oscillating plate 10 is oscillated by the rotation of the swash plate 9, whereby each piston 13 is reciprocated in the corresponding cylinder bore 2b.

Furthermore, the oscillating plate variable displacement compressor 1 includes a pressure supply passage (not shown) that connects the discharge chamber C2 and the crank chamber C1, a control valve 40 that adjusts the opening of the pressure supply passage, and the crank chamber C1. And a pressure release passage (not shown) communicating with the suction chamber C3.

The configuration of the rotation blocking mechanism 30 will be described in more detail with reference to FIGS. 2 and 3.
2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is an exploded perspective view of the rotation blocking mechanism 30. As described above, the rotation blocking mechanism 30 is configured to block the rotation of the rocking plate 10 while allowing the rocking of the rocking plate 10 due to the rotation of the swash plate 9. In the present embodiment, the rotation preventing mechanism 30 has a configuration similar to that of a so-called double offset type constant velocity joint that is expandable/contractible in the axial direction, and includes an inner ring 31, an outer ring 32, and a plurality (here, six). The ball 33, the cage 34, and the retaining member 35 are included.

The inner ring 31 is mounted on the rotating main shaft 6 via a bearing (slide bearing) 24. However, in the present embodiment, the inner ring 31 is integrated with the shaft support member 7 via the connecting portion 71, and as described above, the shaft support member 7 is movable in the axial direction in the state in which the rotation is blocked. Is inserted in the front side bore portion 2a1 of the center bore 2a. Therefore, the rotary main shaft 6 can rotate with respect to the inner ring 31, but the inner ring 31 cannot rotate around the rotary main shaft 6, and the inner ring 31 moves on the rotary main shaft 6 together with the shaft support member 7 in the axial direction. It is only possible to move to. Further, the combined body of the inner ring 31 and the shaft supporting member 7 is fronted by the first urging spring 25 arranged between the bottom surface of the front side bore portion 2a1 of the center bore 2a and the combined body (the shaft supporting member 7). It is urged toward the rear side and is urged toward the rear side by the second urging spring 26 arranged between the rotor 8 and the combined body (the inner ring 31).

FIG. 4 shows the combined body (the inner ring 31 and the shaft supporting member 7 integrated via the connecting portion 71). 4(A) is a front view of the combined body, FIG. 4(B) is a side view of the combined body, and FIG. 4(C) is a sectional view taken along the line AA of FIG. 4(A).

The combined body (the inner ring 31 and the shaft support member 7 integrated through the connecting portion 71) has a through hole H that linearly penetrates the inner ring 31, the connecting portion 71, and the shaft supporting member 7. Then, the rotating main shaft 6 is inserted into the through hole H via the bearings 22 and 24 in a state where the shaft support member 7 of the connecting body is inserted into the front bore portion 2a1 of the center bore 2a, whereby the rotating main shaft 6 is rotated. The rear side is supported via the shaft support member 7 and the bearing 22, and the inner ring 31 is mounted on the rotary main shaft 6 via the bearing 24. Therefore, the inner ring 31 is arranged in the crank chamber C1, one end 31a of the inner ring 31 is located on the rotor 8 side, and the other end 31b of the inner ring 31 is located on the piston 13 side. Further, the center line of the through hole H becomes the center line L2 of the inner ring 31, and when the rotary spindle 6 is inserted into the through hole H, the center line of the through hole H (center line L2 of the inner ring 31) is Coincides with the axis L1 of.

The outer peripheral surface 311 of the inner ring 31 is formed as a convex curved surface whose cross-sectional shape cut along a plane including the center line L2 of the inner ring 31 is convex outward in the radial direction. A plurality of (six in this case) ball grooves (hereinafter referred to as “inner ring ball grooves”) 312 for guiding the rolling of the plurality of balls 33 are formed on the outer peripheral surface 311 of the inner ring 31. Each of the plurality of inner ring ball grooves 312 is formed as a groove having an arc-shaped cross section corresponding to the ball 33. Further, the groove center line L3 of each of the plurality of inner ring ball grooves 312 is parallel to the center line L2 of the inner ring 31, and each of the plurality of inner ring ball grooves 312 extends parallel to the center line L2 of the inner ring 31. Further, the plurality of inner ring ball grooves 312 are separated from each other in the circumferential direction by the same distance. That is, on the outer peripheral surface 311 of the inner ring 31, a plurality of inner ring ball grooves 312 that extend parallel to the center line L2 of the inner ring 31 and guide the rolling of the balls 33 are formed at equal intervals in the circumferential direction.

The outer ring 32 is arranged outside the inner ring 31. One end 32a of the outer ring 32 is located on the rotor 8 side, and the other end 32b of the outer ring 32 is located on the piston 13 side. A swash plate 9 is rotatably supported by a bearing (radial bearing) 27 on a portion 321a of the outer peripheral surface 321 of the outer ring 32 on the one end 32a side (that is, the rotor 8 side). The rocking plate 10 is fixed to a portion 321b on the other end 32b side (that is, the piston 13 side) of the outer peripheral surface 321 of the outer ring 32. A thrust bearing 28 is provided between the swash plate 9 and the swing plate 10.

FIG. 5 shows the outer ring 32. 5(A) is a front view of the outer ring 32, FIG. 5(B) is a side view of the outer ring 32, and FIG. 5(C) is a sectional view taken along line BB of FIG. 5(A).

The inner peripheral surface 322 of the outer ring 32 has a cylindrical inner peripheral surface 322a arranged on the rotor 8 side and a reduced diameter inner peripheral surface 322b arranged on the piston 13 side. The reduced-diameter inner peripheral surface 322b has the same diameter as the cylindrical inner peripheral surface 322a at the end on the side of the cylindrical inner peripheral surface 322a (the connecting portion with the cylindrical inner peripheral surface 322a). The diameter is gradually reduced from the cylindrical inner peripheral surface 322a as the distance from the surface 322a increases. Further, in the present embodiment, the inner peripheral surface 322 of the outer ring 32 further has a large-diameter inner peripheral surface 322c arranged on the rotor 8 side of the cylindrical inner peripheral surface 322a. The large-diameter inner peripheral surface 322c is formed in a cylindrical shape having a larger diameter than the cylindrical inner peripheral surface 322a. That is, in the present embodiment, the inner peripheral surface 322 of the outer ring 32 has a large-diameter inner peripheral surface 322c, a cylindrical inner peripheral surface 322a, and a reduced-diameter inner peripheral surface 322b from the rotor 8 side toward the piston 13 side. The inner space of the outer ring 32 is gradually or gradually reduced from the rotor 8 side toward the piston 13 side.

A step portion 322d between the large-diameter inner peripheral surface 322c and the cylindrical inner peripheral surface 322a of the inner peripheral surface 322 of the outer ring 32 is adjacent to the cylindrical inner peripheral surface 322a of the outer ring 32 on the rotor 8 side and on the rotor 8 side. When the outer ring 32 is viewed from, the end surface exposed in a ring shape is formed inside the large-diameter inner peripheral surface 322c. A mounting groove 323 is formed on the large-diameter inner peripheral surface 322c at a position separated from the step portion 322d on the rotor 8 side by a predetermined amount. The mounting groove 323 is formed as a substantially annular groove.

On the inner peripheral surface 322 of the outer ring 32, a plurality of (here, six) ball grooves (hereinafter referred to as “outer ring ball grooves”) 325 for guiding the rolling of the plurality of balls 33 are formed. Like the inner ring ball groove 312, each of the plurality of outer ring ball grooves 325 is formed as a groove having an arc-shaped cross section corresponding to the ball 33. The groove center line L4 of each of the plurality of outer ring ball grooves 325 is parallel to the center line L5 of the outer ring 32, and each of the plurality of outer ring ball grooves 325 extends parallel to the center line L5 of the outer ring 32. Furthermore, the plurality of outer ring ball grooves 325 are separated from each other by the same distance in the circumferential direction. The outer ring 32 is arranged so that the plurality of outer ring ball grooves 325 face the plurality of inner ring ball grooves 312 of the inner ring 31. That is, on the inner peripheral surface 322 of the outer ring 32, a plurality of outer ring ball grooves 325 that extend parallel to the center line L5 of the outer ring 32 and guide the rolling of the balls 33 are formed on the outer peripheral surface 311 of the inner ring 31. It is formed so as to face the plurality of inner ring ball grooves 312.

Each of the plurality of balls 33 is rotatably held between the inner ring ball groove 312 and the outer ring ball groove 325 that face each other.

The cage 34 is arranged between the inner ring 31 and the outer ring 32. One end 34a of the retainer 34 is located on the rotor 8 side, and the other end 34b of the retainer 34 is located on the piston 13 side.

FIG. 6 shows the cage 34. 6A is a front view of the cage 34, FIG. 6B is a side view of the cage 34, FIG. 6C is a rear view of the cage 34, and FIG. FIG. 7 is a sectional view taken along line CC of FIG.

The retainer 34 is formed in a wide ring shape and has a plurality of (here, six) ball accommodating portions 341 each accommodating any of the plurality of balls 33. Each ball accommodating portion 341 is formed as a through hole that penetrates from the outer peripheral surface 342 to the inner peripheral surface 343 of the cage 34. Like the inner ring ball groove 312 and the outer ring ball groove 325, the plurality of ball accommodating portions 341 are arranged at equal intervals in the circumferential direction. The outer peripheral surface 342 of the retainer 34 is formed as a curved surface along the reduced diameter inner peripheral surface 322b of the inner peripheral surface 322 of the outer ring 32, and the inner peripheral surface 343 of the retainer 34 is formed on the outer peripheral surface 311 (convex curved surface) of the inner ring 31. It is formed along a curved surface (concave curved surface). More specifically, the inner peripheral surface 343 of the cage 34 has a cross-sectional shape that is cut along a plane including the outer peripheral surface 311 (convex curved surface) of the inner ring 31 and including the center line L6 of the cage 34, and is concave inward in the radial direction. Is formed into a concave curved surface.

The outer ring 32 and the cage 34 are configured to be relatively displaced with a part of the reduced-diameter inner circumferential surface 322b of the outer ring 32 and a part of the outer circumferential surface 342 of the cage 34 contacting each other. 34 and the inner ring 31 are configured to be relatively displaced while a part of the inner peripheral surface 343 of the cage 34 and a part of the outer peripheral surface 311 of the inner ring 31 are in contact with each other.

The retaining member 35 prevents the retainer 34 from falling off, and thus prevents the rotation preventing mechanism 30 from being disassembled. The retaining member 35 is attached to the outer ring 32. More specifically, the retaining member 35 is attached to the outer ring 32 at a position closer to the rotor 8 than the cylindrical inner peripheral surface 322a is.

FIG. 7 shows the retaining member 35. 7(A) is a front view of the retaining member 35, and FIG. 7(B) is a sectional view taken along the line D-D of FIG. 7(A).

In the present embodiment, the retaining member 35 is formed as a ring-shaped plate capable of accommodating the rotor 8 side portion of the cage 34 inside. Specifically, the inner peripheral surface 351 of the retaining member 35 is formed as a curved surface whose diameter on the cage 34 side is larger than that on the opposite rotor 8 side and which extends along the outer peripheral surface 342 of the cage 34. There is. The retaining member 35 prevents the retainer 34 from coming off by the inner peripheral surface 351 of which comes into contact with the outer peripheral surface 342 of the retainer 34 when the portion of the retainer 34 on the rotor 8 side is accommodated inside. Is configured.

The retaining member 35 has an outer diameter that is larger than the diameter of the cylindrical inner peripheral surface 322 a of the outer ring 32 and smaller than the diameter of the large-diameter inner peripheral surface 322 c, and the stepped portion on the inner peripheral surface 322 of the outer ring 32. It is attached by a snap ring 36 attached to the attachment groove 323 so as to come into contact with 322d. As a result, the retaining member 35 is movable in the radial direction with respect to the outer ring 32 by the amount of the clearance between the large-diameter inner peripheral surface 322c of the outer ring 32 and the outer diameter of the retaining member 35, and the rotation preventing mechanism 30. Irrespective of the state (mainly the relative inclination between the inner ring 31 and the outer ring 32), at least a part of the inner peripheral surface 351 is in contact with the outer peripheral surface of the retainer 34 from the cylindrical inner peripheral surface 322a of the outer ring 32. It is attached at a position on the rotor 8 side.

Next, an example of the operation of the oscillating plate type variable compression mechanism 1 will be described.
When the rotary main shaft 6 rotates due to the rotational driving force from the outside, the rotor 8 and the swash plate 9 rotate, and the rocking plate 10 rocks. As a result, each piston 13 reciprocates within the corresponding cylinder bore 2b. The refrigerant in the refrigerant circuit is introduced into the suction chamber C3 through the suction passage, and the refrigerant in the suction chamber C3 is moved along with the reciprocating motion of the piston 13 through the suction valve and the suction hole 53 to the cylinder bore 2b. Is inhaled and compressed. The compressed refrigerant is discharged into the discharge chamber C2 through the discharge hole 51 and the discharge valve 52, and the refrigerant discharged into the discharge chamber C2 (refrigerant after compression) is sent to the refrigerant circuit through the discharge passage. To be

When the control valve is opened, the refrigerant in the discharge chamber C2 is supplied to the crank chamber C1 via the pressure supply passage, and the pressure in the crank chamber C1 rises. When the pressure in the crank chamber C1 becomes higher than the pressure in the suction chamber C3, the inclination angle of the swash plate 9 decreases, and the swash plate 9, the oscillating plate 10, and the rotation blocking mechanism 30 cause the first biasing spring 25 to move. It moves to the rear side against the urging force of. As a result, the stroke of each piston 13 is reduced and the displacement of the oscillating plate type variable displacement compressor 1 is also reduced. On the other hand, when the control valve is closed, the refrigerant in the crank chamber C1 flows out into the suction chamber C3 through the pressure release passage, and the pressure in the crank chamber C1 decreases. When the pressure in the crank chamber C1 becomes lower than the pressure in the suction chamber C, the inclination angle of the swash plate 9 increases, and the swash plate 9, the oscillating plate 10, and the rotation blocking mechanism 30 cause the second biasing spring 26 to move. It moves to the front side against the urging force of. As a result, the stroke of each piston 13 increases and the discharge capacity of the oscillating plate variable displacement compressor 1 also increases.

The oscillating plate type variable displacement compressor according to this embodiment has the following effects.

In the rotation blocking mechanism 30 that blocks the rotation of the oscillating plate 10, the inner ring ball groove 312 formed in the inner ring 31 extends parallel to the center line L2 of the inner ring 31, and the outer ring ball groove 325 formed in the outer ring 32 is The outer ring 32 extends parallel to the center line L5. Therefore, it is relatively easy to process (form) the inner ring ball groove 312 of the inner ring 31 and the outer ring ball groove 325 of the outer ring 32, and the dimensional variation between the inner ring ball grooves 312 and the outer ring ball groove 325. The dimensional variation between them is also suppressed. Therefore, the grooves on the inner ring 31 and the outer ring 32 can be processed more easily and more accurately than in the conventional case.

Further, the rotation preventing mechanism 30 has the following features in addition to the inner ring ball groove 312 extending parallel to the center line L2 of the inner ring 31 and the outer ring ball groove 325 extending parallel to the center line L5 of the outer ring 32. Have That is, the outer peripheral surface 311 of the inner ring 31 is formed as a convex curved surface whose cross-sectional shape cut by a plane including the center line L2 of the inner ring 31 is convex outward in the radial direction. The inner peripheral surface 322 of the outer ring 32 gradually increases from the same diameter as the cylindrical inner peripheral surface 322a as it is arranged on the rotor 8 side and the cylindrical inner peripheral surface 322a arranged on the piston 13 side. It has a diameter-reduced inner peripheral surface 322b. The inner peripheral surface 343 of the cage 34 arranged between the inner ring 31 and the outer ring 32 is a curved surface (concave curved surface) along the outer peripheral surface 311 (convex curved surface) of the inner ring 31, more specifically, the outer peripheral surface of the inner ring 31. The cross-sectional shape cut along a plane including the center line L6 of the cage 34 along the 311 (convex curved surface) is formed into a concave curved surface that is concave inward in the radial direction, and the outer peripheral surface 342 of the cage 34 has an outer ring 32. Is formed as a curved surface along the reduced diameter inner peripheral surface 322b. The retaining member 35 is attached to the outer ring 32 at a position closer to the rotor 8 than the cylindrical inner peripheral surface 322a is. Therefore, it is possible to incorporate the retainer 34 in a state in which the plurality of balls 33 are accommodated in the plurality of ball accommodating portions 341 from the rotor 8 side between the inner ring 31 and the outer ring 32, and then attach the retaining member 35. Thus, the rotation blocking mechanism 30 can be easily assembled.

When the rotation preventing mechanism 30 is in operation, the outer ring 32 and the cage 34 are opposed to each other in a state where a part of the reduced-diameter inner peripheral surface 322b of the outer ring 32 and a part of the outer peripheral surface 342 of the cage 34 are in contact with each other. Since the cage 34 and the inner ring 31 are displaced relative to each other in a state where a part of the inner peripheral surface 343 of the cage 34 and a part of the outer peripheral surface 311 of the inner ring 31 are in contact with each other, these relative displacements are smooth. And the generation of vibration and noise is suppressed.

Furthermore, the retaining member 35 is movable in the radial direction with respect to the outer ring 32, and at least a part of the inner peripheral surface 351 contacts the outer peripheral surface 342 of the cage 34 regardless of the state of the rotation blocking mechanism 30. It is attached to the outer ring 32. Therefore, regardless of the state of the rotation blocking mechanism 30, the retainer 35 prevents the retainer 34 from falling off.

Here, since the retaining member 35 is movable in the radial direction with respect to the outer ring 32 and the inner peripheral surface 351 of the retaining member 35 is formed as a curved surface along the outer peripheral surface 342 of the cage 34, The radial position of the retaining member 35 can be adjusted, and the retaining member 35 can be easily attached to an appropriate position. Therefore, the retaining member 35 is not required to have high processing accuracy, mounting accuracy, etc., and the manufacturing cost can be reduced.

In addition, the retaining member 35 is formed by the snap ring 36 so as to contact the step portion 322d on the inner peripheral surface 322 of the outer ring 32, that is, the end surface adjacent to the rotor 8 side with respect to the cylindrical inner peripheral surface 322a of the outer ring 32. Since it is attached, it is easy to position the retaining member 35 in the axial direction and to attach the retaining member 35 to the outer ring 32 so as to be movable in the radial direction.

In addition, in the above-mentioned embodiment, the retaining member 35 is formed as a ring-shaped plate. However, the present invention is not limited to this, and the retaining member 35 may have the same configuration as the above-mentioned ring-shaped plate. For example, the retaining member 35 is a plate material having a through hole capable of accommodating the rotor 8 side portion of the cage 34, is movable in the radial direction with respect to the outer ring 32, and is in the state of the rotation blocking mechanism 30. Regardless, at least a part of the inner peripheral surface of the through hole may be attached to the outer ring 32 so as to contact the outer peripheral surface 342 of the cage 34. In this case, the inner peripheral surface of the through hole is formed as a curved surface whose diameter on the cage 34 side is larger than that on the opposite rotor 8 side and which extends along the outer peripheral surface 342 of the cage 34. When the portion of the retainer 34 on the rotor 8 side is accommodated, the inner peripheral surface of the through hole abuts the outer peripheral surface 342 of the retainer 34 to prevent the retainer 34 from falling off.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and further modifications and changes can be made based on the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1... Oscillating plate type variable displacement compressor, 2... Cylinder block (housing), 3... Front housing (housing), 4... Cylinder head (housing), 5... Valve plate, 6... Rotating main shaft, 7... Shaft supporting member, 8... Rotor, 9... Swash plate, 10... Oscillating plate, 11... Coupling mechanism, 30... Rotation blocking mechanism, 31... Inner ring, 32... Outer ring, 33... Ball, 34... Retainer, 35... Retaining member, 36 ... snap ring, 311... inner ring outer peripheral surface, 312... inner ring ball groove, 321... outer ring outer peripheral surface, 322... outer ring inner peripheral surface, 322a... cylindrical inner peripheral surface, 322b... reduced diameter inner peripheral surface, 322d... Step portion, 325... Outer ring ball groove, 341... Ball accommodating portion, 342... Retainer outer peripheral surface, 343... Retainer inner peripheral surface, 351... Retaining member inner peripheral surface

Claims (7)

A housing; a rotating main shaft rotatably supported by the housing; a rotor fixed to the rotating main shaft and rotating with the rotating main shaft; A swash plate whose inclination angle can be changed with respect to the axis of the main shaft, a swash plate that is connected to a piston and oscillates by the rotation of the swash plate to reciprocate the piston, and a rotation block that blocks the rotation of the swash plate. And a mechanism,
The rotation prevention mechanism is
An inner ring provided with a plurality of inner ring ball grooves formed on the outer peripheral surface so as to be movable in the axial direction on the rotation main shaft in a state where rotation is blocked;
An outer ring arranged outside the inner ring, wherein the swing plate is fixed to the outer peripheral surface and a plurality of outer ring ball grooves facing the plurality of inner ring ball grooves are formed on the inner peripheral surface,
A plurality of balls each rollably held by the inner ring ball groove and the outer ring ball groove,
A retainer arranged between the inner ring and the outer ring, each retainer having a plurality of ball accommodating portions for accommodating any of the plurality of balls,
A retaining member attached to the outer ring to prevent the retainer from falling off;
Have
Each of the plurality of inner ring ball grooves extends parallel to the center line of the inner ring,
Each of the plurality of outer ring ball grooves extends parallel to the center line of the outer ring,
The outer peripheral surface of the inner ring is formed as a convex curved surface whose cross-sectional shape cut along a plane including the center line of the inner ring is convex outward in the radial direction,
The inner peripheral surface of the outer ring is gradually arranged from the same diameter as the cylindrical inner peripheral surface disposed on the rotor side and the cylindrical inner peripheral surface disposed on the piston side as the distance from the cylindrical inner peripheral surface increases. Including a diameter-reduced inner peripheral surface to be diameter-reduced,
The inner peripheral surface of the retainer is formed as a curved surface along the outer peripheral surface of the inner ring, and the outer peripheral surface of the retainer is formed as a curved surface along the reduced diameter inner peripheral surface of the outer ring,
The retaining member is attached to a position closer to the rotor than the cylindrical inner peripheral surface of the outer ring,
Oscillating plate type variable displacement compressor. The retaining member has a through hole capable of accommodating the rotor-side portion of the retainer, and the inner peripheral surface of the through hole is formed as a curved surface along the outer peripheral surface of the retainer. When the rotor-side portion of the cage is housed in the through hole, the inner peripheral surface of the through hole abuts the outer peripheral surface of the cage to prevent the cage from falling off. An oscillating plate type variable displacement compressor according to claim 1. The retaining member is movable in the radial direction with respect to the outer ring, and at least a part of the inner peripheral surface of the through hole is in contact with the outer peripheral surface of the cage regardless of the operating state of the rotation blocking mechanism. The oscillating plate type variable displacement compressor according to claim 2, which is attached to the outer ring so as to be in contact with each other. The retaining member is formed as a ring-shaped plate capable of accommodating the rotor-side portion of the retainer, and an inner peripheral surface thereof is formed as a curved surface along the outer peripheral surface of the retainer. Wherein the inner peripheral surface abuts the outer peripheral surface of the retainer to prevent the retainer from falling off when the rotor-side portion of the retainer is housed inside. The oscillating plate type variable displacement compressor according to Item 1 or 2. The retaining member is movable in the radial direction with respect to the outer ring, and the at least part of the inner peripheral surface is in contact with the outer peripheral surface of the cage regardless of the operating state of the rotation preventing mechanism. The oscillating plate type variable displacement compressor according to claim 4, which is attached to an outer ring. The swing-out member according to any one of claims 1 to 5, wherein the retaining member is attached so as to abut on an end surface of the outer ring that is adjacent to the rotor side with respect to the cylindrical inner peripheral surface. Plate type variable capacity compressor. The oscillating plate type variable displacement compressor according to any one of claims 1 to 6, wherein the retaining member is attached to a position closer to the rotor than the cylindrical inner peripheral surface of the outer ring by a snap ring. ..