JP2016191347A - Oscillation plate type variable displacement compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress abnormal abrasion in an oscillation plate rotation inhibition mechanism to improve durability, by suppressing whirling vibration of a rotation main shaft.SOLUTION: In an inner ring 27 of an oscillation plate rotation inhibition mechanism 21, provided are a first support part 52 of which the outer peripheral surface is supported to the inner peripheral surface of a guide hole 2A in a cylinder block 2, and a second support part 53 of which the inner peripheral surface supports a rotational main shaft 5 through a slide bearing 51. The first support part 52 and the second support part 53 are overlapped within a range from a minimum inclination angle to a maximum inclination angle of a swash plate 8, in the axial direction of the rotational main shaft 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oscillating plate type variable capacity compressor in which a piston is reciprocated by an oscillating plate that oscillates with the rotation of a rotating main shaft, and more particularly to an oscillating plate type variable compressor used in a refrigerant circulation device such as a vehicle air conditioner system. It relates to a capacity compressor.

  As this type of oscillating plate variable displacement compressor, the one described in Patent Document 1 has been proposed. The swing plate type variable displacement compressor described in Patent Document 1 swings the piston support along with the rotation of the swash plate whose front end side and rear end side rotate together with the main shaft rotatably supported by the housing via a bearing. To move the piston back and forth within the cylinder bore. A rotation prevention mechanism for the piston support is provided in the middle portion of the main shaft, and the structure of the rotation prevention mechanism is devised to suppress the vibration and noise of the main shaft that occur when the compressor is driven.

JP-A-5-99137

  By the way, the rotation prevention mechanism of the oscillating plate type variable capacity compressor described in Patent Document 1 is arranged on the outer periphery of a swash plate sleeve that is movable in the axial direction with respect to the main shaft and is integrally rotated with the main shaft. A support sleeve is inserted so as to be rotatable relative to the swash plate sleeve. The support sleeve is supported by a guide hole in a cylinder block (which constitutes a part of the housing) so as to be movable only in the axial direction of the main shaft. In other words, the main shaft is supported by the inner peripheral surface of the support sleeve via the swash plate sleeve, and the support sleeve is supported by the guide hole of the cylinder block. However, since the support portion of the support sleeve that supports the main shaft and the support portion of the support sleeve that is supported by the guide hole of the cylinder block do not overlap in the axial direction of the main shaft, the vibration of the main shaft that occurs when the compressor is driven For example, the support sleeve has a cantilever structure, and the effect of suppressing the vibration of the main shaft is not sufficient.

  The present invention has been made paying attention to the above problems, and provides a swing plate type variable capacity compressor capable of sufficiently suppressing the swinging vibration of the rotating main shaft by devising the mounting structure of the rotation prevention mechanism. Objective.

  Therefore, the oscillating plate variable capacity compressor of the present invention includes a rotating main shaft whose front end side and rear end side are rotatably supported by a housing, and an inclined shaft that rotates together with the rotating main shaft and can tilt with respect to the rotating main shaft. A plate, a swing plate that swings with respect to the rotation main shaft as the swash plate rotates and reciprocates the piston in the cylinder bore, and is provided at an intermediate portion of the rotation main shaft when the rotation main shaft rotates. An oscillating plate rotation displacement mechanism for preventing rotation of the oscillating plate, and an oscillating plate type variable displacement compressor that varies the stroke amount of the piston by varying an inclination angle of the swash plate with respect to the rotation main shaft. The swing plate rotation preventing mechanism is a first support in which an outer peripheral surface is supported with respect to an inner peripheral surface of the guide hole of the housing so as to be movable in an axial direction of the rotation main shaft and to prevent rotation around the shaft. A guide member having a portion, and A connecting mechanism that connects the swing plate and the guide member so that the swing plate can swing with respect to the id member and the rotation preventing force of the guide member is transmitted. It further has a 2nd support part which supports the rotation main axis by an inner peripheral surface, and the 1st support part and the 2nd support part overlap in the direction of an axis of the rotation main axis.

  According to the oscillating plate type variable displacement compressor of the present invention, it is possible to suppress the whirling vibration of the rotating main shaft generated during the operation of the compressor. Thereby, the contact state of each part of the rocking plate rotation prevention mechanism can be improved, abnormal wear of the rocking plate rotation prevention mechanism can be improved, and the durability of the rocking plate type variable capacity compressor can be improved.

It is sectional drawing which shows the structural example of the rocking | fluctuation plate type variable capacity compressor which concerns on one Embodiment of this invention. It is sectional drawing in another driving | running state of the rocking | fluctuation plate type variable capacity compressor of FIG. It is a disassembled perspective view of the principal part containing the rocking | fluctuation plate rotation prevention mechanism of the rocking | fluctuation plate type variable capacity compressor of FIG. 1 shows an example of a swing plate type variable capacity compressor of FIG. 1, (A) is a partial sectional view, and (B) is a partial front view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A configuration example of an embodiment of a swing plate type variable displacement compressor according to the present invention will be described with reference to FIGS.

  FIG. 1 is an example of the configuration of the swing plate type variable displacement compressor of the present embodiment, and shows an operating state at the maximum discharge capacity at which the inclination angle of the swash plate is maximized. FIG. 2 shows an operation state at the minimum discharge capacity at which the inclination angle of the swash plate is minimum in the swing plate type variable displacement compressor of FIG. FIG. 3 is an exploded perspective view of the main part including the rocking plate rotation blocking mechanism in the rocking plate type variable displacement compressor of FIG. FIG. 4 shows an example of a rocking plate rotation prevention mechanism in the rocking plate type variable displacement compressor of FIG.

  This oscillating plate type variable capacity compressor 1 varies the inclination angle of the swash plate rotating with the rotating main shaft with respect to the rotating main shaft, and the oscillating plate swings with respect to the rotating main shaft as the swash plate rotates. By changing the stroke amount of the piston to change the refrigerant discharge capacity from the cylinder bore.

  In FIG. 1, a swing plate type variable capacity compressor 1 is formed of a cylinder block 2 arranged at the center and a front housing 3 and a rear housing 4 arranged on both sides thereof, and a rotational driving force is externally applied. An input rotation main shaft 5 is provided so as to penetrate from the front housing 3 to the cylinder block 2 portion. The rotation main shaft 5 is rotatably supported on the front housing 3 via a bearing 33 (radial bearing) and at the rear end on a fixed wall in the cylinder block 2 via a bearing 22 (radial bearing). Yes. A rotor 6 is fixed to the rotary main shaft 5 so as to be integrally rotatable, and a thrust bearing 32 is interposed between the rotor 6 and the front housing 3. A swash plate 8 is connected to the rotor 6 via a hinge mechanism 7 so as to be able to tilt with respect to the rotary main shaft 5 and to be rotatable together with the rotary main shaft 5. A piston 10 is inserted in each cylinder bore 9 arranged at the inner peripheral edge of the cylinder block 2 so as to be able to reciprocate. The piston 10 is connected to the swing plate 12 via a connecting rod 11. . A thrust bearing 31 is interposed between the oscillating plate 12 and the swash plate 8, and the oscillating plate 12 oscillates as the swash plate 8 rotates, so that the piston 10 reciprocates via the connecting rod 11. Moved. As the piston 10 reciprocates, a fluid to be compressed (for example, a refrigerant gas) from a suction chamber 13 formed in the inner peripheral edge of the rear housing 4 is sucked into a suction hole 15 (suction valve is a suction valve) formed in the valve plate 14. (Not shown) is sucked into the cylinder bore 9 and the sucked fluid to be compressed is compressed and then discharged into the discharge chamber 17 formed in the center of the rear housing 4 through the discharge hole 16 (discharge valve is not shown). And sent from there to an external circuit.

  The oscillating plate 12 oscillates while being prevented from rotating by a peristaltic plate rotation preventing mechanism 21 provided at an intermediate portion of the rotation main shaft 5. Hereinafter, the swing plate rotation preventing mechanism 21 will be described.

  The rocking plate rotation prevention mechanism 21 is movable in the axial direction of the rotation main shaft 5 and is prevented from rotating about the rotation main shaft 5 by an inner ring rotation prevention mechanism described later. The swing plate rotation preventing mechanism 21 includes an inner ring 27 as a guide member, and a connecting mechanism that connects the swing plate 12 and the inner ring 27. The inner ring 27 is movable in the axial direction of the rotation main shaft 5 and has a first support portion 52 whose outer peripheral surface is supported with respect to the inner peripheral surface of the guide hole 2A of the cylinder block 2 so as to prevent rotation around the axis. It has the 2nd support part 53 which supports the rotation main shaft 5 via the slide bearing 51 attached to the said internal peripheral surface by the internal peripheral surface. Moreover, the said connection mechanism is comprised as what is called a constant velocity joint. The coupling mechanism guides the balls 25 to positions facing the guide grooves 26 of the inner ring 27 and a plurality of guide grooves 26 formed in the inner ring 27 to guide the balls 25 for power transmission. An outer ring 30 as a support member for fixing and supporting the swing plate 12 on the outer peripheral portion and rotatably supporting the swash plate 8 via a bearing 29 (radial bearing), and an inner ring 27. And the plurality of balls 25 which are held by the guide grooves 26 and 28 facing each other and formed in the outer ring 30 and transmit power by being compressed between the guide grooves 26 and 28, and a bearing 23 (radial bearing). The rotary main shaft 5 is supported via the rotary shaft 5 so as to be rotatable relative to the rotary main shaft 5 and movable in the axial direction. A sleeve 24 which rotatably engages the inner ring 27, and is configured with a. The outer ring 30 can swing around the sleeve 24 with respect to the inner ring 27 via spherical contact between the guide grooves 26 and 28 and the ball 25. Further, the rotation preventing force from the inner ring 27 side is transmitted to the outer ring 30 side through spherical contact between the guide grooves 26 and 28 and the ball 25.

  The inner ring rotation prevention mechanism described above is configured by a contact structure that causes the guide hole 2A in the cylinder block 2 and the outer peripheral surface of the inner ring 27 to contact each other when the rotation main shaft 5 rotates. Specifically, the outer peripheral surface of the inner ring 27 is composed of three peripheral surfaces formed in a substantially triangular shape with an angle between adjacent peripheral surfaces and 60 °. The guide hole 2A in the cylinder block 2 is also composed of three peripheral surfaces formed in a substantially triangular shape with an angle formed by the adjacent peripheral surface and the peripheral surface corresponding to the outer peripheral surface of the inner ring 27. Yes. When the inner ring 27 rotates with respect to the cylinder block 2 as the rotating main shaft 5 rotates, the edge portions of the respective circumferential surfaces of the inner ring 27 come into contact with the respective circumferential surfaces of the guide holes 2 </ b> A in the cylinder block 2. Thus, the rotation of the inner ring 27 is prevented.

  Note that the inner ring rotation prevention mechanism in the swing plate rotation prevention mechanism 21 of the present embodiment is not limited to the contact structure described above, and may be a general rotation restriction mechanism such as a key or a spline.

  FIG. 4 shows a state in which the relative angle between the inner and outer rings 27 and 30 is zero in the swing plate rotation preventing mechanism 21. As shown in FIG. 4A, the guide grooves 26 and 28 formed in the inner ring 27 and the outer ring 30 of the swing plate rotation preventing mechanism 21 are at a relative angle (30 ° to 60 °) with respect to the central axis of the rotation main shaft 5. Relative angle within the range of A guide groove 26 formed on the inner ring 27 (the axis of the guide groove 26 is indicated by 42) and a guide groove 28 formed on the outer ring 30 (the guide groove 28 of the guide groove 28) constitute one ball guide 41 and face each other. Is symmetrical with respect to a plane 44 that is perpendicular to the main spindle 5 and passes through the oscillation center of the oscillation plate 12 when the relative angle between the axis of the inner ring 27 and the axis of the outer ring 30 is zero. It is arranged to be in form. The ball 25 is regulated and supported on the intersection of the shaft 42 of the guide groove 26 and the shaft 43 of the guide groove 28. Further, as shown in FIG. 4B, of the plurality of ball guides 41 of the swing plate rotation prevention mechanism 21, two adjacent ball guides are paired, and each ball guide in the pair of ball guides 45. In other words, the guide groove shaft 46 formed in the outer ring in this portion can be configured in parallel with each other. With this configuration, as described above, the rotation direction backlash of the rocking plate rotation prevention mechanism is largely determined by the relationship between the distance between the bottom of the pair of guide grooves installed on the inner and outer rings 27 and 30 and the ball ball diameter. Clearance can be easily set and managed, and play can be reduced by setting an appropriate clearance. The plurality of balls 25 are supported in the compression direction between the guide grooves 26 and 28 facing each other with the balls 25 interposed therebetween, and transmit power. Since the ball 25 is held so as to be held by the opposing guide grooves 26 and 28 and comes into contact with both guide grooves 26 and 28, a sufficiently large contact area between the ball 25 and the respective guide grooves 26 and 28 is ensured. As a result, the contact surface pressure can be reduced, and the structure is extremely advantageous in terms of reliability, vibration, and quietness. Further, the ball diameter of the ball 25 can be reduced, and the entire swing plate rotation prevention mechanism 21 can be downsized.

  Further, a load applied to the ball 25 given as a moment about the rotation main shaft 5 is generated as a normal force of the actual contact surface. The smaller the inclination of the contact surface normal with respect to the moment direction, the smaller the contact load, and the pair of ball guides 45 arranged in parallel as described above are arranged symmetrically with respect to the plane including the central axis 5a of the rotation main shaft 5. In other words, the shafts 46 of the two sets of guide grooves formed in the inner and outer rings 27 and 30 are arranged symmetrically with respect to the plane including the central axis 5a of the rotation main shaft 5, As a rocking plate rotation prevention mechanism that does not select the rotation direction, it is possible to minimize the ball contact load.

  In the swing plate rotation prevention mechanism 21 configured as described above, the inner ring 27 having the first support portion 52 whose outer peripheral surface is supported with respect to the inner peripheral surface of the guide hole 2A of the cylinder block 2 It further has the 2nd support part 53 supported by an internal peripheral surface. The first support portion 52 and the second support portion 53 of the inner ring 27 are configured to overlap with each other in the axial direction of the rotation main shaft 5, and the rocking plate rotation prevention mechanism 21 suppresses the whirling vibration of the rotation main shaft 5. It has a function to do. Specifically, in this embodiment, when the inclination angle of the swash plate 8 when the swash plate 8 is orthogonal to the rotation main shaft 5 is 0 °, the minimum inclination angle of the swash plate 8 shown in FIG. As shown, the first support portion 52 and the second support portion 53 overlap the rotary main shaft 5 in the axial direction in the range up to the maximum inclination angle of the swash plate 8 that is regulated by the swash plate 8 coming into contact with the rotor 6. It is configured. However, the present invention is not limited to this. The first support portion 52 and the second support portion 53 need only overlap at least when the swash plate 8 has the minimum inclination angle, and may not overlap, for example, when the swash plate 8 has the maximum inclination angle.

  According to the oscillating plate variable displacement compressor 1 having such a configuration, the first support portion 52 and the second support portion 53 overlap in the axial direction of the rotation main shaft 5, thereby supporting the intermediate portion of the rotation main shaft 5. However, it does not have a conventional cantilever structure and can effectively suppress the whirling vibration of the rotating spindle 5 that occurs when the compressor is driven. As a result, the rotation of the rotary spindle 5 becomes smooth, the contact state of each part of the swing plate rotation prevention mechanism 21 is improved, abnormal wear of the swing plate rotation prevention mechanism 21 is improved, and the swing plate type variable displacement compression. The durability of the machine 1 can be improved. Further, in the present embodiment, since the rotation main shaft 5 is also supported by the sleeve 24, the whirling vibration of the rotation main shaft 5 can be further suppressed, and the durability of the swing plate type variable capacity compressor 1 can be further improved.

  In this embodiment, a constant velocity joint is used as a coupling mechanism that couples the rocking plate 12 and the inner ring 27 so that the transmitted rotational speed does not change even if the tilt angle changes. However, the present invention is not limited to this. For example, a universal joint in which the rotation speed transmitted when the tilt angle changes may be applied.

  In the present embodiment, the bearing 23 is interposed between the sleeve 24 and the rotation main shaft 5. However, the bearing 24 may be omitted and the sleeve 24 may directly support the rotation main shaft 5.

  In the present embodiment, the slide bearing 51 is interposed between the inner ring 27 and the rotary main shaft 5. However, the slide bearing 51 is omitted and the rotary main shaft 5 is directly supported on the inner peripheral surface of the inner ring 27. It is good.

  A case where the inner ring 27 is formed by assembling a plurality of divided members, for example, two divided members, can be considered. In this case, a plurality of (for example, two) divided members are arranged between the rotation main shaft and the guide hole, and the rotation main shaft is supported by the inner surface of each divided member. The inner surface of each of the divided members, that is, the surface facing the rotation main shaft is also included in the “inner peripheral surface”.

DESCRIPTION OF SYMBOLS 1 Oscillating plate type variable capacity compressor 2 Cylinder block 2A Guide hole 5 Rotating main shaft 6 Rotor 8 Swash plate 9 Cylinder bore 10 Piston 12 Oscillating plate 21 Oscillating plate rotation prevention mechanism 22, 33 Radial bearing 24 Sleeve 25 Ball 26 Guide groove ( Inner ring side)
27 Inner ring 28 Guide groove (outer ring side)
30 outer ring 51 slide bearing 52 first support portion 53 second support portion

Claims (5)

A rotating main shaft whose front end side and rear end side are rotatably supported by a housing, a swash plate that rotates together with the rotating main shaft and can be tilted with respect to the rotating main shaft, and the rotating main shaft as the swash plate rotates. An oscillating plate that oscillates relative to and reciprocates the piston in the cylinder bore, and an oscillating plate rotation prevention mechanism that is provided at an intermediate portion of the rotating main shaft and prevents the rotating plate from rotating when the rotating main shaft rotates. Oscillating plate type variable displacement compressor that varies the stroke amount of the piston by varying the inclination angle of the swash plate with respect to the rotating main shaft,
The swing plate rotation prevention mechanism is
A guide member having a first support portion which is movable in the axial direction of the rotation main shaft and has an outer peripheral surface supported with respect to an inner peripheral surface of the guide hole of the housing so as to prevent rotation around the axis;
A coupling mechanism that couples the rocking plate and the guide member so that the rocking plate can rock with respect to the guide member and a rotation blocking force of the guide member is transmitted.
The guide member further includes a second support portion that supports the rotation main shaft on an inner peripheral surface,
The first support portion and the second support portion overlap each other in the axial direction of the rotary main shaft.   2. The oscillating plate variable displacement compressor according to claim 1, wherein the first support portion and the second support portion overlap in a range from a minimum inclination angle to a maximum inclination angle of the swash plate in an axial direction of the rotation main shaft.   3. The swing plate type variable capacity compressor according to claim 1, wherein the coupling mechanism that connects the swing plate and the guide member is a constant velocity joint. 4.   The coupling mechanism includes a plurality of guide grooves formed in the guide member for guiding power transmission balls, and a plurality of guide grooves for guiding the balls to positions opposed to the guide grooves of the guide member. And a support member that fixedly supports the swing plate on the outer periphery and rotatably supports the swash plate via a bearing, and is compressed by the guide grooves held by the guide grooves facing each other. A plurality of balls for transmitting power and the support member are slidably supported and engaged with the guide member so as to be movable in the axial direction together with the guide member on the rotation main shaft. The oscillating plate type variable displacement compressor according to claim 3, comprising a sleeve that supports the oscillating plate.   3. The swing plate type variable capacity compressor according to claim 1, wherein the coupling mechanism that connects the swing plate and the guide member is a universal joint. 4.