JP4247899B2 - Thrust bearing mechanism and scroll fluid machine using the thrust bearing mechanism - Google Patents

Description

  The present invention relates to a thrust bearing mechanism provided between at least two members capable of relative displacement and a scroll fluid machine using the thrust bearing mechanism.

  In general, a scroll type fluid machine includes a casing, a fixed scroll provided in the casing, a drive shaft rotatably provided in the casing, and a fixed scroll provided rotatably on a front end side of the drive shaft. And a orbiting scroll defining a plurality of compression chambers. As such a scroll type fluid machine, there is known one provided with a thrust bearing mechanism that is provided between a casing and the back surface of the orbiting scroll and supports a thrust load that acts on the orbiting scroll (for example, see Patent Document 1). ).

JP 11-280671 A

  And this thrust bearing mechanism is comprised by the spherical body accommodation case fixed to the casing, and the spherical body which is accommodated in this spherical body accommodation case, and contacts the back surface of a casing and a turning scroll so that rolling is possible.

  In this prior art, the sphere in the sphere housing case is rolled between the casing and the orbiting scroll according to the orbiting operation of the orbiting scroll, and the thrust load acting on the orbiting scroll is supported by the sphere. It has become.

  By the way, in the thrust bearing mechanism according to the above-described prior art, the sphere housing case has a housing hole having a depth similar to that of the sphere, and the sphere is configured to accommodate almost the entire sphere in the housing hole. The space between the storage case and the sphere (the space in the storage hole) is large. For this reason, in order to maintain the lubricity of a sphere, when the sphere housing case is filled with grease, the amount of the grease tends to increase. Further, for example, when the scroll type fluid machine is used with the thrust shaft direction being horizontal (sideways), there is a problem that grease leaks from between the spherical body housing case and the orbiting scroll.

  On the other hand, when a sealing material that is in sliding contact with the back surface of the orbiting scroll is provided in the spherical body accommodation case, leakage of grease can be suppressed by the sealing material. However, in this case, there is a problem that the number of parts increases due to the sealing material, the assembly of the sealing material is difficult, and the manufacturing cost is high.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a thrust bearing mechanism that can prevent leakage of grease while eliminating the need for a sealing material, and a scroll-type fluid using the thrust bearing mechanism. To provide a machine.

In order to solve the above-mentioned problem, the invention of claim 1 is a thrust bearing mechanism provided between at least two members capable of relative displacement, and is a first bearing body fixed to one of the two members. And the second bearing body fixed to the other member at a position facing the first bearing body, and the first bearing member in a state where a gap is formed between the opposing surfaces of the first and second bearing bodies. , A sphere provided in a rollable manner between the second bearing bodies, and at least one of the first and second bearing bodies surrounding the gap and provided around the sphere. to define a space for retaining the grease between the facing surfaces of said one bearing member, constituted by a grease holding member that will be disposed in the gap in a state of being spaced from the opposing face of the other bearing body, said grease The holding member surrounds the outer peripheral side of the one bearing body and The space for holding the grease is composed of a cylindrical tube portion extending in the strike direction and an annular flange portion that is provided at the tip in the thrust direction and extends toward the inner peripheral side of the tube portion. It is characterized in that it is formed between the flange portion of the grease holding member and the opposing surface of the one bearing body .

In the invention of claim 2, provided to fix the tubular part of the grease retaining member to the bearing body of the one, the flange portion is a structure in which Ru extending toward the spherical body face to face with the opposite surface of the bearing member of the one Yes.

According to a third aspect of the present invention, a groove surrounding the spherical body is formed in the flange portion of the grease holding member so as to be positioned on the surface facing the counterpart bearing body.

The invention of claim 4 is a scroll type fluid machine using the thrust bearing mechanism of the present invention, wherein the thrust bearing mechanism includes a casing for guiding a shaft driven by a driving device, and an eccentric rotation by the shaft. It is set as the structure provided between the moving scroll scrolls.

According to the first aspect of the present invention, at least one of the first and second bearing bodies is provided so as to surround the gap between the first and second bearing bodies, and is provided around the sphere. position and by defining a space for holding grease between the facing surfaces of said one bearing assembly, the grease holding member that will be disposed in the gap in the separated state from the surface facing the other bearing member is provided, this The grease holding member is a cylindrical tube portion that surrounds the outer peripheral side of the one bearing body and extends in the thrust direction, and is provided at the tip end in the thrust direction of the tube portion and bends and extends toward the inner peripheral side. Since the space for holding the grease is formed between the flange portion of the grease holding member and the opposing surface of the one bearing body, for example, in the first bearing body. when provided with the grease holding member, the grease holding member It is possible to form a space for grease retention sphere side an annular recess (groove) surrounding the sphere is open between the flange portion located portion and the facing surface of the first bearing member. For this reason, a spherical body can be smoothly rolled by filling this space with grease. Further, since the space for grease retention are defined between the grease holding member and the first bearing body, this space can be made smaller than the thrust direction of the length to the diameter of the sphere, grease The filling amount can be reduced.

Further , since the space for retaining grease forms an annular recess surrounding the sphere, even when the thrust shaft is used in a horizontal direction, the grease does not leak from this space. Therefore, the grease in the space between the first bearing member and the grease holding member because it is possible to securely hold, it is possible to omit the sealing material, it is possible to reduce manufacturing costs, Lubrication failure due to insufficient grease can be prevented, and the life and reliability of the thrust bearing mechanism can be improved.

Moreover, the grease holding member includes a cylindrical barrel portion extending in the thrust direction surrounding the outer peripheral side of the one bearing body, bent toward the inner periphery side is provided in the thrust direction of the distal end of the tubular portion since having an annular flange portion extending Te, it is possible to define a space for retaining the grease between the flange portion and the opposing surface of said one bearing member. At this time, the grease holding space forms an annular recess (groove) that surrounds the sphere and has an inner peripheral side (spherical side) opened and an outer peripheral side closed by the cylindrical portion of the grease holding member. Even when used in a horizontal state, the flange portion of the grease holding member can prevent the grease from leaking out of the space. For this reason, since the grease can be reliably held in the space, it is possible to omit a sealing material and the like, to reduce the manufacturing cost, to prevent lubrication failure due to insufficient grease, and to improve the life of the thrust bearing mechanism. , Reliability can be improved.

In addition, since the flange portion is disposed in the gap between the first and second bearing bodies, the space for holding the grease can be reduced in length in the thrust direction compared to the diameter of the sphere. Compared with the above, the filling amount of grease can be reduced. Furthermore, the grease holding member can be formed separately from the bearing body, and the grease holding member can be easily attached to the one bearing body by inserting one bearing body into the cylindrical portion of the grease holding member. Can be fixed.

According to the invention of claim 2 , the cylindrical portion of the grease holding member is fixed to one bearing body , and the annular flange portion provided at the tip of the cylindrical portion faces the opposing surface of the one bearing body. because was configured to extend toward the sphere Te, we are possible to define a space for located within the cylindrical portion between the opposed surfaces of the flange portion and the one of the bearing member to hold the grease. At this time, the space for holding the grease forms an annular recess (groove) in which the inner peripheral side (spherical side) is open and the outer peripheral side is closed by the cylindrical portion, so that the thrust shaft is used in a horizontal direction, for example. Even at times, the flange portion can prevent the grease from leaking out of the space. For this reason, since the grease can be reliably held in the space, it is possible to omit a sealing material and the like, to reduce the manufacturing cost, to prevent lubrication failure due to insufficient grease, and to improve the life of the thrust bearing mechanism. , Reliability can be improved.

According to the invention of claim 3 , since the groove that surrounds the sphere is formed in the flange portion of the grease holding member on the surface facing the counterpart bearing body, the gap between the flange portion and the counterpart bearing body is formed. The gap dimension (gap dimension) is narrow at a position other than the groove and wide at the groove position. For this reason, a labyrinth effect can be produced by the groove, and leakage of grease from the gap between the flange portion and the counterpart bearing body can be suppressed.

According to the invention of claim 4, the thrust bearing mechanism according to the present invention is provided between the casing for guiding the shaft driven by the driving device and the orbiting scroll that rotates eccentrically by the shaft. The sphere of the bearing mechanism can be rolled between the casing and the orbiting scroll according to the orbiting operation of the orbiting scroll, and the thrust load acting on the orbiting scroll can be supported by the sphere.

  Hereinafter, a case where a thrust bearing mechanism according to an embodiment of the present invention is applied to a scroll type air compressor as a scroll type fluid machine will be described as an example and described in detail with reference to the accompanying drawings.

  1 to 4 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a casing which forms an outer frame of a scroll type air compressor and guides a drive shaft 8 which will be described later. Is constituted by a bottomed cylindrical motor case 2 having one end opened and a thrust receiver 6 to be described later provided on the opening end of the motor case 2. An electric motor 3 as a drive device is accommodated and provided in the motor case 2, and the electric motor 3 includes a stator 4 fixedly provided in the motor case 2, and an inner portion of the stator 4. The rotor 5 and the drive shaft 8 are provided on the circumferential side.

  A thrust receiver 6 is fixedly provided on the opening end side of the motor case 2 of the casing 1. The thrust receiver 6 includes an annular plate portion 6A for closing the opening end side of the motor case 2 and the annular plate portion 6A. It is comprised by the cylinder part 6B extended toward the direction spaced apart from the motor case 2 from the outer peripheral side. The thrust receiver 6 is configured to receive a thrust load acting on the orbiting scroll 12 via a thrust bearing mechanism 17 described later.

  Reference numeral 7 denotes a fixed scroll attached to a thrust receiver 6 of the casing 1, and the fixed scroll 7 includes a disc-shaped end plate 7A disposed so as to coincide with an axis of a drive shaft 8 to be described later, and the end plate 7A. It comprises a spiral wrap portion 7B standing on the surface and a cylindrical portion 7C protruding downward from the outer edge side of the end plate 7A. The fixed scroll 7 is attached to the thrust receiver 6 using a fixing bolt 7D.

  Reference numeral 8 denotes a drive shaft (shaft) that is rotatably provided on the casing 1 via bearings 9, 9. The drive shaft 8 is integrally attached to the rotor 5 of the electric motor 3 on the base end side. It is driven by rotation. Further, the front end side of the drive shaft 8 is a cylindrical crank portion 8A, and the crank portion 8A is eccentric with respect to the center axis of the drive shaft 8 by a dimension δ.

  A balance weight 10 for balancing the rotation with the orbiting scroll 12 is provided at an intermediate position in the axial direction of the drive shaft 8, and the outer peripheral side of the crank portion 8A is located on the back side of the orbiting scroll 12. A fan 11 that blows cooling air toward the orbiting scroll 12 and the like is provided.

  Reference numeral 12 denotes a orbiting scroll provided on the front end side of the drive shaft 8 so as to be opposed to the fixed scroll 7, and the orbiting scroll 12 has a disc-shaped end plate 12A and a front side of the end plate 12A. It is generally configured by a spiral wrap portion 12B that is erected. In addition, a plurality of fins 12C are arranged in a row on the back side of the end plate 12A, and a columnar boss portion 12D projects from the central portion. The boss portion 12D is inserted into the crank portion 8A of the drive shaft 8 and is rotatably attached to the crank portion 8A via the swivel bearing 13. Furthermore, on the back side of the end plate 12A, four cylindrical pedestal portions 12E are projected, and a thrust bearing mechanism 17 described later is attached to the pedestal portion 12E.

  Further, the orbiting scroll 12 is disposed so as to overlap the wrap portion 7B of the fixed scroll 7 by, for example, 180 degrees, and a plurality of compression chambers 14, 14... Are defined between the wrap portions 7B, 12B. Is done. During the operation of the scroll type air compressor, the orbiting scroll 12 is swung by the drive shaft 8 while sucking air from the suction port 15 provided on the outer peripheral side of the fixed scroll 12 into the compression chamber 14 on the outer peripheral side. During the eccentric rotation, the compressed air is sequentially compressed in each compression chamber 14, and finally the compressed air is discharged from the central compression chamber 14 to the outside through the discharge port 16 provided at the center of the fixed scroll 12.

  Reference numeral 17 denotes four thrust bearing mechanisms provided between the thrust receiver 6 of the casing 1 and the rear surface of the end plate 12A of the orbiting scroll 12. The thrust bearing mechanism 17 includes first and second bearing bodies 18, which will be described later. 19, a sphere 20 and a cover member 21, which support a thrust load acting on the orbiting scroll 12.

  A first bearing body 18 is provided on the thrust receiver 6 of the casing 1 so as to be spaced apart at substantially equal intervals along the circumferential direction. The bearing body 18 is formed in a substantially disk shape and is a base of the orbiting scroll 12. It is fixed at a position facing the portion 12E. Further, a guide groove 18 </ b> B having a substantially arc-shaped cross section for guiding the spherical body 20 is provided in a concave surface 18 </ b> A of the bearing body 18 facing the second bearing body 19.

  Reference numeral 19 denotes a second bearing body fixed to the pedestal portion 12E of the orbiting scroll 12. The bearing body 19 faces the first bearing body 18 at the back side of the orbiting scroll 12 along the circumferential direction. They are provided at approximately equal intervals. Further, the second bearing body 19 is formed in a substantially disc shape substantially the same as the first bearing body 18, and the cross-section for guiding the sphere 20 on the side of the facing surface 19 </ b> A facing the first bearing body 18 is approximately. An arcuate guide groove 19B is recessed.

  Reference numeral 20 denotes a sphere that is sandwiched between the first and second bearing bodies 18 and 19 so as to be able to roll. The sphere 20 is formed using a steel material or the like, and has a dimension α between the bearing bodies 18 and 19. A gap S is formed. The spherical body 20 is configured to support the thrust load acting on the orbiting scroll 12 by making rolling contact with the guide grooves 18B and 19B of the bearing bodies 18 and 19.

  Reference numeral 21 denotes a cover member serving as a grease holding member provided in the first bearing body 18 so as to surround the gap S. The cover member 21 is configured so that the bearing body 18 is accommodated in the cylindrical portion 21A. The outer peripheral surface is fitted and fixed (fixed and fixed).

  Here, the cover member 21 surrounds the outer peripheral side of the bearing body 18 and extends in the thrust direction (axial direction of the drive shaft 8), and is provided at the tip of the cylinder portion 21A in the thrust direction. And an annular (ring-shaped) flange portion 21B which is bent and extended toward the inner peripheral side.

  In addition, a substantially circular through hole 21C is formed on the inner peripheral side of the flange portion 21B, which is always located on the inner side of the outer peripheral edge of the opposing bearing body 19, and the inner diameter dimension of the through hole 21C is that of the spherical body 20. The size is set so as not to hinder the dynamic motion (for example, the size of the outer peripheral edge of the guide groove 18B). Furthermore, the flange portion 21B extends from the cylindrical portion 21A toward the spherical body 20 while facing the facing surface 18A of the bearing body 18, and is spaced from the facing surface 18A of the bearing body 18 between the bearing bodies 18 and 19. It arrange | positions in the clearance gap S. The spherical body 20 protrudes toward the bearing body 19 from the flange portion 21B through the through hole 21C, and can contact the guide groove 19B of the bearing body 19.

  Reference numeral 22 denotes a grease holding space formed between the flange portion 21B and the facing surface 18A of the bearing body 18. The grease holding space 22 is located around the sphere 20 and has an inner peripheral side (the sphere 20 side) opened. Thus, the outer peripheral side is defined as a groove-like space closed by the cylindrical portion 21A. The grease holding space 22 forms an annular recess (annular groove) that surrounds the sphere 20 along the flange portion 21B, and a flange portion that forms a groove opening from the inner wall surface of the cylinder portion 21A that forms the groove bottom. The grease G is filled over the through-hole 21C of 21B.

  Reference numeral 23 denotes a groove for suppressing leakage of grease G provided on the surface facing the bearing body 19 in the flange portion 21B. The groove 23 is formed in, for example, a substantially annular shape along the through hole 21C of the flange portion 21B. And surrounds the sphere 20. The groove 23 pivots with respect to the second bearing body 19 together with the first bearing body 18, but the groove 23 is always located inside the outer peripheral edge of the opposing second bearing body 19. The outer diameter is set. As a result, the groove 23 does not protrude from the position of the outer peripheral edge of the second bearing body 19 to the outer peripheral side, and always faces the bearing body 19. For this reason, the groove | channel 23 is suppressing that the grease G leaks outside from the clearance gap between the bearing body 19 and the flange part 21B by what is called a labyrinth effect.

  Note that an anti-rotation mechanism, which is usually an Oldham joint or the like, is provided between the back of the orbiting scroll and the casing, but according to the present embodiment, it is not necessary to provide an Oldham joint or the like separately. The rotation of the orbiting scroll 12 is prevented by the first and second bearing bodies 18 and 19 and the sphere 20.

  The scroll type air compressor according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when the drive shaft 8 is rotated by the electric motor 3, the orbiting scroll 12 performs a revolving motion (orbiting motion) having a turning radius (dimension δ) around the drive shaft 8, and the wrap portion 7 B of the fixed scroll 7 and The compression chamber 14 defined between the orbiting scroll 12 and the lap portion 12B is continuously reduced. Accordingly, the compressed air is stored in the external air tank (not shown) or the like from the discharge port 16 of the fixed scroll 7 while sequentially compressing the outside air sucked from the suction port 15 of the fixed scroll 7 in each compression chamber 14. .

  At this time, the sphere 20 of each thrust bearing mechanism 17 rolls between the thrust receiver 6 of the casing 1 and the back surface of the end plate 12A of the orbiting scroll 12 following the orbiting motion of the orbiting scroll 12. A thrust load acting on the orbiting scroll 12 can be supported.

  However, in the present embodiment, the first bearing body 18 is provided so as to surround the gap S between the first and second bearing bodies 18 and 19, and is positioned around the sphere 20. Since the cover member 21 that defines the grease holding space 22 is provided between the opposing surface 18A of the body 18 and the annular recess (groove) that surrounds the sphere 20 between the opposing surface 18A of the first bearing body 18. It is possible to form the grease holding space 22 opened on the non-spherical body 20 side. For this reason, the spherical body 20 can be smoothly rolled by filling the grease holding space 22 with the grease G. Further, since the grease holding space 22 is defined between the first bearing body 18, the length dimension in the thrust direction of the grease holding space 22 can be made smaller than the diameter of the sphere 20. The filling amount can be reduced. Furthermore, since the grease holding space 22 forms an annular recess surrounding the sphere 20, the grease G does not leak from the grease holding space 22 even when used in a state where the thrust shaft is in the horizontal direction, for example. The grease can be reliably held in the grease holding space 22.

  In particular, in the present embodiment, the cover member 21 faces the cylindrical portion 21A to which the first bearing body 18 is fixed, and the facing surface 18A of the first bearing body 18 provided at the tip of the cylindrical portion 21A. Since the annular flange portion 21B extending toward the spherical body 20 is formed, the grease holding space 22 is defined between the flange portion 21B and the facing surface 18A of the bearing body 18 located in the cylindrical portion 21A. Can do. At this time, the grease holding space 22 forms an annular recess (groove) whose inner peripheral side (spherical body 20 side) is open and whose outer peripheral side is closed by the cylindrical portion 21A. Even if it did, it can prevent that the grease G leaks from the inside of the grease holding space 22 by the flange part 21B. For this reason, since the grease G can be reliably held in the grease holding space 22, it is possible to omit a sealing material and the like, to reduce the manufacturing cost, and to prevent poor lubrication due to insufficient grease. The life and reliability of the bearing mechanism can be improved.

  Further, since the flange portion 21B is disposed in the gap S between the first and second bearing bodies 18 and 19, the grease holding space 22 has a length dimension in the thrust direction smaller than the diameter of the sphere 20. The amount of grease G filled can be reduced compared to the prior art.

  Further, since a groove 23 surrounding the spherical body 20 is formed in the flange portion 21B of the cover member 21 so as to be located on the surface facing the counterpart bearing body 19, the distance between the flange portion 21B and the bearing body 19 is determined. The (gap size) is narrow at a position other than the groove 23 and is wide at the position of the groove 23. For this reason, the labyrinth effect can be produced by the groove 23, and leakage of the grease G from the gap between the flange portion 21 </ b> B and the second bearing body 19 can be suppressed.

  Further, since the cover member 21 is constituted by the cylindrical portion 21A that accommodates the first bearing body 18 and the flange portion 21B provided at the tip of the cylindrical portion 21A, the cover member 21 is separated from the bearing body 18. The cover member 21 can be easily fitted and fixed to the bearing body 18 by inserting the bearing body 18 into the cylindrical portion 21 </ b> A of the cover member 21. Thereby, since the cover member 21 can be fixed in the axial direction of the bearing body 18, noise, galling, and the like due to the movement of the cover member 21 when the compressor is driven can be prevented.

  Further, since the thrust bearing mechanism 17 is provided between the casing 1 that guides the drive shaft 8 driven by the electric motor 3 and the orbiting scroll 12 that rotates eccentrically by the drive shaft 8, the thrust bearing mechanism 17 is provided. The sphere 20 can be rolled between the casing 1 and the orbiting scroll 12 according to the orbiting operation of the orbiting scroll 20, and the thrust load acting on the orbiting scroll 12 can be supported by the sphere 20.

  Next, FIG. 5 and FIG. 6 show a second embodiment of the present invention. The feature of this embodiment is that the cylindrical portion of the cover member is provided with a protrusion protruding toward the inner peripheral side, and the cover member A recess is provided at a position corresponding to the protrusion on the outer peripheral side of the first bearing body to be attached, and the cover member is fixed by engaging the protrusion of the cover member with the recess of the first bearing body. It is in the configuration to do. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  31 is a thrust bearing mechanism according to the present embodiment. The thrust bearing mechanism 31 is substantially the same as the thrust bearing mechanism 17 according to the first embodiment, and a first bearing body 32 fixed to the thrust receiver 6; A second bearing body 19 fixed to the pedestal portion 12E of the orbiting scroll 12, a spherical body 20 sandwiched between the bearing bodies 32 and 19, and a cover member 33 to be described later attached to the first bearing body 32. And is composed of.

  Here, the first bearing body 32 is formed in a substantially disc shape and is fixed to a position facing the pedestal 12E of the orbiting scroll 12 in substantially the same manner as the first bearing body 18 according to the first embodiment. In addition, a guide groove 32B having a substantially arc-shaped cross section that guides the sphere 20 is recessed on the side of the surface 32A facing the second bearing body 19.

  However, unlike the first embodiment, a recessed portion 32C having a U-shaped cross section is formed on the outer peripheral side of the first bearing body 32 at a position corresponding to a later-described protrusion 33D (on the thrust receiver 6 side). Has been. The recessed portion 32 </ b> C forms an annular groove extending over the entire circumference of the first bearing body 32.

  Reference numeral 33 denotes a cover member as a grease holding member according to the present embodiment provided in the first bearing body 32 so as to surround the gap S. The cover member 33 is substantially the same as the cover member 21 according to the first embodiment. Similarly, a cylindrical cylindrical portion 33A that surrounds the outer peripheral side of the bearing body 32, and an annular shape (ring shape) that is provided at the tip in the thrust direction of the cylindrical portion 33A and is bent toward the inner peripheral side. The through-hole 33C is formed in the inner peripheral side of the flange part 33B. The flange portion 33 </ b> B extends from the tubular portion 33 </ b> A toward the spherical body 20 in a state of facing the facing surface 32 </ b> A of the bearing body 32.

  Further, the cover member 33 is formed with, for example, four protrusions 33D which are located on the base end side in the thrust direction of the cylindrical portion 33A and protrude toward the inner peripheral side, and the protrusions 33D are recessed in the bearing body 32. Engage in the state of being hooked on the portion 32C. Accordingly, the protrusion 33D prevents the cover member 33 from being displaced in the thrust direction, and prevents the cover member 33 from being detached from the bearing body 32.

  Reference numeral 34 denotes a grease holding space formed between the flange portion 33B and the facing surface 32A of the bearing body 32. The grease holding space 34 is similar to the grease holding space 22 according to the first embodiment. It is defined as a space that forms an annular recess whose inner peripheral side (the sphere 20 side) is open and the outer peripheral side is closed by the cylindrical portion 33A, and is filled with grease G.

  35 is a groove formed on the side of the flange portion 33B facing the bearing body 19, and the groove 35 suppresses the leakage of the grease G by the labyrinth effect in substantially the same manner as the groove 23 according to the first embodiment. is doing.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment.

  In particular, in the present embodiment, the cylindrical portion 33A of the cover member 33 is provided with a protrusion 33D that protrudes toward the inner peripheral side, and a concave portion 32C that engages with the protrusion 33D is provided on the outer peripheral side of the first bearing body 32. Since it is provided, the cover member 33 can be prevented from being displaced in the thrust direction by hooking the protrusion 33D on the recess 32C. As a result, the cover member 33 can be prevented from coming off and can be fixed in the axial direction of the bearing body 32, so that noise, galling, and the like due to the movement of the cover member 33 when the compressor is driven can be prevented. be able to.

  Next, FIGS. 7 and 8 show a third embodiment of the present invention. The feature of the present embodiment is that the cylindrical portion of the cover member is provided with a recess and the cover member is to be attached. Protrusion is provided on the outer peripheral side of the bearing body at a position corresponding to the recess, and the cover member is fixed by engaging the recess of the cover member with the protrusion of the first bearing body. It is in. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  41 is a thrust bearing mechanism according to the present embodiment. The thrust bearing mechanism 41 is substantially the same as the thrust bearing mechanism 17 according to the first embodiment, and a first bearing body 42 fixed to the thrust receiver 6; The second bearing body 19 fixed to the pedestal portion 12E of the orbiting scroll 12, the spherical body 20 sandwiched between these bearing bodies 42 and 19, and a cover member 43 described later attached to the first bearing body 42. And is composed of.

  Here, the first bearing body 42 is formed in a substantially disk shape, substantially in the same manner as the first bearing body 18 according to the first embodiment, and is fixed to a position facing the pedestal portion 12E of the orbiting scroll 12. In addition, a guide groove 42B having a substantially arc-shaped cross-section for guiding the sphere 20 is recessed on the side facing the second bearing body 19 on the side 42A, but on the outer peripheral side of the first bearing body 42. Unlike the first embodiment, for example, two protrusions 42C are formed which are located on the thrust receiver 6 side and extend outward in the radial direction.

  Reference numeral 43 denotes a cover member as a grease holding member according to the present embodiment provided in the first bearing body 42 so as to surround the gap S. The cover member 43 is substantially the same as the cover member 21 according to the first embodiment. Similarly, a cylindrical portion 43A fixed to the bearing body 42, and an annular (ring-shaped) flange portion 43B that is provided at the tip of the cylindrical portion 43A and bends and extends toward the inner peripheral side. A through hole 43C is formed on the inner peripheral side of the portion 43B. Further, the flange portion 43B extends from the cylindrical portion 43A toward the spherical body 20 in a state of facing the facing surface 42A of the bearing body 42.

  Further, the cover member 43 is formed with, for example, two dents 43D penetrating through the cylinder part 43A and positioned on the base end side in the thrust direction of the cylinder part 43A corresponding to the protrusion 42C of the bearing body 42. . Then, the protrusion 32C of the bearing body 32 is inserted into the recessed portion 43D, and the recessed portion 43D and the protrusion 42C are engaged with each other while being latched. Thereby, the recessed portion 43D prevents the cover member 43 from being displaced in the thrust direction, and prevents the cover member 43 from being detached from the bearing body 42.

  Reference numeral 44 denotes a grease holding space formed between the flange portion 43B and the facing surface 42A of the bearing body 42. The grease holding space 44 is similar to the grease holding space 22 according to the first embodiment. It is defined as a space that forms an annular recess having an inner peripheral side (the sphere 20 side) that is open and the outer peripheral side is closed by the cylindrical portion 43A, and the inside thereof is filled with grease G.

  45 is a groove formed in the flange portion 43B on the side facing the bearing body 19, and the groove 45 suppresses the leakage of the grease G by the labyrinth effect in substantially the same manner as the groove 23 according to the first embodiment. is doing.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same function and effect as in the first embodiment, but in the present embodiment, the cylindrical portion 43A of the cover member 43 has penetrated. Since the recess 43D is provided and the protrusion 42C is provided on the outer peripheral side of the first bearing body 42, the cover member 43 is displaced in the thrust direction by latching the recess 43D and the protrusion 42C. Therefore, it is possible to prevent noise, galling and the like associated with the movement of the cover member 43 when the compressor is driven.

  Next, FIG. 9 shows a fourth embodiment of the present invention. The feature of the present embodiment is that the cylindrical portion of the cover member has a reduced diameter opening portion that is reduced in diameter toward the proximal end side in the thrust direction. A tapered portion having a diameter reduced toward the base end side in the thrust direction is provided on the outer peripheral side of the first bearing body to be attached to the cover member, and the reduced diameter opening of the cover member is provided in the first bearing. The cover member is fixed by engaging with the tapered portion of the body. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  51 is a thrust bearing mechanism according to the present embodiment. The thrust bearing mechanism 51 is substantially the same as the thrust bearing mechanism 17 according to the first embodiment, and a first bearing body 52 fixed to the thrust receiver 6; The second bearing body 19 fixed to the pedestal portion 12E of the orbiting scroll 12, the spherical body 20 sandwiched between the bearing bodies 52 and 19, and a cover member 53 to be described later attached to the first bearing body 52. And is composed of.

  Here, the first bearing body 52 is formed in a substantially disc shape and is fixed to a position facing the pedestal portion 12E of the orbiting scroll 12 in substantially the same manner as the first bearing body 18 according to the first embodiment. In addition, a guide groove 52B having a substantially arc-shaped cross section for guiding the sphere 20 is recessed on the side facing the second bearing body 19 on the side of the facing surface 52A, but on the outer peripheral side of the first bearing body 52. Unlike the first embodiment, a tapered portion 52C having a diameter gradually reduced toward the base end side (thrust receiving 6 side) in the thrust direction is formed.

  53 is a cover member as a grease holding member according to the present embodiment, which is provided in the first bearing body 52 so as to surround the gap S. The cover member 53 is substantially the same as the cover member 21 according to the first embodiment. Similarly, a cylindrical portion 53A fixed to the bearing body 52 and an annular (ring-shaped) flange portion 53B which is provided at the tip of the cylindrical portion 53A and bends and extends toward the inner peripheral side. A through hole 53C is formed on the inner peripheral side of the portion 53B. Further, the flange portion 53 </ b> B extends from the cylindrical portion 53 </ b> A toward the spherical body 20 in a state of facing the facing surface 52 </ b> A of the bearing body 52.

  Further, the cylindrical portion 53A of the cover member 53 is formed with a reduced diameter opening portion 53D having a diameter reduced toward the proximal end side in the thrust direction. The reduced diameter opening 53D comes into contact with and engages with the tapered portion 52C of the bearing body 52 when the cover member 53 is attached to the bearing body 52. Thereby, the reduced diameter opening 53D prevents the cover member 53 from being displaced in the thrust direction, and prevents the cover member 53 from being detached from the bearing body 52.

  Reference numeral 54 denotes a grease holding space formed between the flange portion 53B and the facing surface 52A of the bearing body 52. The grease holding space 54 is similar to the grease holding space 22 according to the first embodiment. It is defined as a space that forms an annular recess in which the inner peripheral side (the sphere 20 side) is open and the outer peripheral side is closed by the cylindrical portion 53A, and the inside thereof is filled with grease G.

  55 is a groove formed in the flange portion 53B on the side facing the bearing body 19, and the groove 55 suppresses the leakage of the grease G by the labyrinth effect in substantially the same manner as the groove 23 according to the first embodiment. is doing.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same function and effect as in the first embodiment. However, in this embodiment, the diameter of the cylindrical portion 53A of the cover member 53 is reduced. Since the opening 53D is formed and the tapered portion 52C is provided on the outer peripheral side of the first bearing body 52, the cover member 53 is brought into contact with and engaged with the reduced diameter opening 53D and the tapered portion 52C. Can be prevented from being displaced in the thrust direction, and noise, galling and the like associated with the movement of the cover member 53 when the compressor is driven can be prevented.

  Next, FIG. 10 shows a fifth embodiment of the present invention, and the feature of this embodiment is that a cover member is provided on both the first and second bearing bodies. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 61 denotes a thrust bearing mechanism according to the present embodiment. The thrust bearing mechanism 61 includes first and second bearing bodies 18 and 19 that are substantially the same as the thrust bearing mechanism 17 according to the first embodiment. A spherical body 20 sandwiched between the bearing bodies 18 and 19, a cover member 21 attached to the first bearing body 18, and a cover member 62 described later attached to the second bearing body 19. .

  Reference numeral 62 denotes a cover member serving as a grease holding member provided in the second bearing body 19 so as to surround the gap S. The cover member 62 is substantially the same as the cover member 21 according to the first embodiment. 19 and a ring-shaped (ring-shaped) flange portion 62B which is provided at the tip of the tube portion 62A and bends and extends toward the inner peripheral side, and the inner periphery of the flange portion 62B. A through hole 62C is formed on the side. Further, the flange portion 62 </ b> B extends from the cylindrical portion 62 </ b> A toward the spherical body 20 in a state facing the facing surface 19 </ b> A of the bearing body 19.

  Reference numeral 63 denotes a grease holding space formed between the flange portion 62B and the facing surface 19A of the bearing body 19. The grease holding space 63 is similar to the grease holding space 22 according to the first embodiment. It is defined as a space that forms an annular recess in which the inner peripheral side (the sphere 20 side) is open and the outer peripheral side is closed by the cylindrical portion 62A, and the inside is filled with grease G.

  64 is a groove formed in the flange portion 62B on the side facing the bearing body 18, and the groove 64 suppresses the leakage of the grease G by the labyrinth effect in substantially the same manner as the groove 23 according to the first embodiment. is doing.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment, but in the present embodiment, the first and second bearing bodies 18 and 19 are provided. Both cover members 21 and 62 are provided, and grease holding spaces 22 and 63 are defined between the flange portions 21B and 62B of the cover members 21 and 62 and the facing surfaces 18A and 19A of the bearing bodies 18 and 19, respectively. Therefore, the grease G can be held in the two grease holding spaces 22 and 63. For this reason, for example, even when the grease G leaks from one of the grease holding spaces 22 and 63, the grease G can be supplied to the sphere 20 from the other space, and the retainability of the grease G is improved. In addition, the reliability can be improved.

  In the above-described embodiments, the four thrust bearing mechanisms 17, 31, 41, 51, 61 are provided at equal intervals on the back surface of the end plate 12A of the orbiting scroll 12. However, three or five or more are provided. These thrust bearing mechanisms may be provided at equal intervals. In short, it is only necessary to prevent the orbiting scroll 12 from being inclined with respect to the drive shaft 8 by the thrust bearing mechanism.

  Further, in each of the above embodiments, the fan 11 that blows the cooling air toward the orbiting scroll 12 or the like is provided on the outer peripheral side of the crank portion 8A. However, as in the modification shown in FIG. In addition, the balance weight 10 'may be provided on the outer peripheral side of the crank portion 8A.

  In the first to fourth embodiments, the cover member 21, 33, 43, 53 is provided on the first bearing body 18, but the cover member is provided on the second bearing body, for example. Alternatively, as in the fifth embodiment, the cover member may be attached to both the first and second bearing bodies.

  In each of the above embodiments, the thrust bearing mechanism 17, 31, 41, 51, 61 is applied to a scroll type air compressor (scroll type fluid machine). However, the present invention is not limited to this, and can be applied to any machine or the like provided with two members capable of relative displacement on which a load in the thrust direction acts.

  Further, in each of the above embodiments, the scroll type air compressor has been described as an example of the scroll type fluid machine. However, the present invention is not limited to this, and can be widely applied to, for example, a vacuum pump, a refrigerant compressor, and the like. It is.

It is a longitudinal section showing a scroll type air compressor to which a thrust bearing mechanism by a 1st embodiment of the present invention was applied. It is a rear view shown in the state which attached the 2nd bearing body to the turning scroll in FIG. It is an expanded sectional view which expands and shows the thrust bearing mechanism in FIG. FIG. 2 is an exploded perspective view showing the cover member and the first bearing body in FIG. 1 in an exploded state. It is an expanded sectional view which expands and shows the thrust bearing mechanism by a 2nd embodiment. FIG. 6 is an exploded perspective view showing the cover member and the first bearing body in FIG. 5 in an exploded state. It is an expanded sectional view which expands and shows the thrust bearing mechanism by 3rd Embodiment. FIG. 8 is an exploded perspective view showing the cover member and the first bearing body in FIG. 7 in an exploded state. It is an expanded sectional view which expands and shows the thrust bearing mechanism by 4th Embodiment. It is an expanded sectional view which expands and shows the thrust bearing mechanism by 5th Embodiment. It is a longitudinal cross-sectional view which shows the scroll type air compressor by a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Motor case 3 Electric motor (drive device)
6 Thrust receiver 7 Fixed scroll 8 Drive shaft (shaft)
8A Crank part 12 Orbiting scroll 17, 31, 41, 51, 61 Thrust bearing mechanism 18, 32, 42, 52 First bearing body 18A, 19A, 32A, 42A, 52A Opposing surface 19 Second bearing body 20 Sphere 21 , 33, 43, 53, 62 Cover member (grease holding member)
21A, 33A, 43A, 53A, 62A Tube portion 21B, 33B, 43B, 53B, 62B Flange portion 21C, 33C, 43C, 53C, 62C Through hole 22, 34, 44, 54, 63 Grease holding space (space)
23, 35, 45, 55, 64 Groove 32C, 43D Recess 33D, 42C Protrusion 52C Taper 53D Reduced diameter opening

Claims (4)

In a thrust bearing mechanism provided between at least two members capable of relative displacement,
A first bearing body fixed to one member of the two members; a second bearing body fixed to the other member at a position facing the first bearing body; and the first and first members. At least one of a sphere that can be rolled between the first and second bearing bodies in a state in which a gap is formed between opposing surfaces of the two bearing bodies, and the first and second bearing bodies. to define a space for retaining the grease between the facing surfaces of said one bearing member around the spherical body provided surrounding said gap in one of the bearing body, spaced from the opposing face of the other bearing body the constituted by the grease holding member that will be positioned in the gap in the state,
The grease holding member surrounds the outer peripheral side of the one bearing body and extends in the thrust direction, and is provided at the tip of the cylindrical portion in the thrust direction and bends and extends toward the inner peripheral side. An annular flange,
The thrust bearing mechanism characterized in that the space for holding the grease is formed between a flange portion of the grease holding member and an opposing surface of the one bearing body . Tubular portion of the grease retaining member is provided to fix the bearing body of the one, the flange portion according to claim 1 comprising a structure extending toward the spherical body face to face with the opposite surface of the bearing member of the one Thrust bearing mechanism. The thrust bearing mechanism according to claim 1 or 2 , wherein a groove that surrounds the spherical body is formed in the flange portion of the grease holding member so as to be positioned on a surface facing the counterpart bearing body. A scroll fluid machine with a thrust bearing arrangement according to any one of claims 1 to 3, wherein the thrust bearing mechanism includes a casing for guiding the shaft which is driven by a drive, an eccentric rotation by the shaft A scroll type fluid machine configured to be provided between the rotating scroll and the rotating scroll.

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