JP2018151025A - Bushing, rotary machine and air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bushing capable of suppressing vibration.SOLUTION: According to one embodiment, a bushing comprises a first member, a second member and a plurality of third members. The first member is provided with a first opening and has a first inner peripheral surface, an outer peripheral surface extending with a first central axis as a center and a plurality of first recessed surfaces being recessed from the outer peripheral surface and disposed around the first central axis. The second member extends with a second central axis as a center, is provided with a second opening in which the first member is accommodated and has a second inner peripheral surface facing the second opening and being spaced away from the first member and a plurality of second recessed surfaces being recessed from the second inner peripheral surface and disposed around the second central axis. The third members are individually brought into contact with the first recessed surfaces and the second recessed surfaces and constituted so as to hold the first member with respect to the second member at a position where the first central axis is spaced away from the second central axis.SELECTED DRAWING: Figure 4

Description

  Embodiments described herein relate generally to a bush, a rotary machine, and an air conditioner.

  In a rotating machine that rotates a rotating body such as a fan, a bush connects a shaft of a power source such as a motor and a rotating body such as a fan. For example, a shaft is inserted into an opening provided in the bush, and a rotating body is connected to the outer periphery of the bush.

JP 2012-92810 A

  The position of the shaft may be different from the position of the center of gravity of the bush and the rotating body. In this case, when the bush and the rotating body rotate, vibration may occur in the rotating body.

  The bush concerning one embodiment is provided with the 1st member, the 2nd member, and a plurality of 3rd members. The first member is provided with a first opening, and is located on the opposite side of the first inner peripheral surface facing the first opening and the first inner peripheral surface, and the first central axis. And a plurality of first concave surfaces that are recessed from the outer peripheral surface so as to protrude toward the first central axis and are disposed around the first central axis. The second member extends about the second central axis and is provided with a second opening in which the first member is accommodated. The second member faces the second opening and is separated from the first member. A plurality of second inner peripheral surfaces facing the outer peripheral surface at a position where the second inner peripheral surface is disposed, and recessed from the second inner peripheral surface so as to protrude away from the second central axis and arranged around the second central axis A second concave surface. Each of the third members is in contact with one of the plurality of first concave surfaces and one of the plurality of second concave surfaces, and the first central axis is separated from the second central axis. The first member is configured to be held with respect to the second member at the position.

FIG. 1 is a perspective view showing an air conditioner according to the first embodiment. FIG. 2 is a perspective view illustrating a main body of the indoor unit according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a main body of the indoor unit according to the first embodiment. FIG. 4 is a perspective view showing the bush according to the first embodiment. FIG. 5 is a plan view showing the bush of the first embodiment. FIG. 6 is a cross-sectional view schematically showing the bush of the first embodiment and a part of the shaft of the motor. FIG. 7 is an exploded perspective view showing the inner cylinder, the outer cylinder, and the three pins of the first embodiment. FIG. 8 is a perspective view showing the inner cylinder and the outer cylinder through which the pin of the first embodiment is inserted. FIG. 9 is a plan view showing a bush according to the second embodiment. FIG. 10 is a cross-sectional view schematically showing a bush according to the third embodiment. FIG. 11 is a plan view showing a bush according to the fourth embodiment. FIG. 12 is a cross-sectional view schematically showing a bush according to the fifth embodiment.

(First embodiment)
The first embodiment will be described below with reference to FIGS. 1 to 8. In the present specification, a plurality of expressions may be described for the constituent elements according to the embodiment and the description of the elements. The constituent elements and descriptions in which a plurality of expressions are made may be other expressions that are not described. Further, the constituent elements and descriptions that are not expressed in a plurality may be expressed in other ways that are not described.

  FIG. 1 is a perspective view showing an air conditioner (air conditioner; hereinafter referred to as an air conditioner) 10 according to a first embodiment. The air conditioner 10 is an example of an air conditioner and a rotary machine, and may be referred to as an air conditioner, for example. The rotating machine is not limited to the air conditioner 10 but may be a mechanism having an industrial motor, a domestic electric appliance such as a fan and a washing machine, or another machine having a power source and a rotating body.

  As shown in each drawing, in this specification, an X axis, a Y axis, and a Z axis are defined. The X axis, the Y axis, and the Z axis are orthogonal to each other. The X axis is along the width of the air conditioner 10. The Y axis is along the length (depth) of the air conditioner 10. The Z axis is along the height of the air conditioner 10.

  As shown in FIG. 1, the air conditioner 10 includes an indoor unit 11. The indoor unit 11 is connected to, for example, an outdoor unit or a control device that controls the indoor unit 11 and the outdoor unit. An air conditioning system in which a plurality of indoor units 11 are connected to one control device may be configured.

  The indoor unit 11 includes a cover 21 and a main body 22. The cover 21 is provided, for example, on the ceiling in the room where the indoor unit 11 is installed. The cover 21 is provided with a plurality of intake ports 25 and a plurality of air supply ports 26. The air supply port 26 can be opened and closed by a louver, for example.

  FIG. 2 is a perspective view illustrating the main body 22 of the indoor unit 11 according to the first embodiment. FIG. 3 is a cross-sectional view illustrating the main body 22 of the indoor unit 11 according to the first embodiment. As shown in FIGS. 2 and 3, the main body 22 includes a housing 31, a heat exchanger 32, a motor 33, a turbo fan 34, a cap 35, and a bush 36. The motor 33 is an example of a power source. The turbo fan 34 is an example of a rotating body and a fan, and may be referred to as a centrifugal fan, for example. The rotating body is not limited to the turbo fan 34, and may be another fan such as a propeller fan, or another rotating body such as a gear or a pulley. The bush 36 may also be referred to as a connection component, a bearing, or a member, for example.

  As shown in FIG. 3, the casing 31 is made of, for example, metal and includes an upper wall 41 and a peripheral wall 42. The upper wall 41 is formed in a plate shape that extends on the XY plane. For example, a rib that improves the rigidity of the upper wall 41 may be formed on the upper wall 41. The peripheral wall 42 is formed in a cylindrical shape extending from the edge of the upper wall 41 in the negative direction along the Z axis (the direction opposite to the arrow of the Z axis, the downward direction).

  An air passage 45 is provided inside the housing 31. The air passage 45 may be formed by the housing 31, or may be formed by a member attached to the inside of the housing 31, for example. The upper wall 41 has an inner surface 41 a that faces the air passage 45. The inner surface 41a faces in the negative direction along the Z axis.

  The heat exchanger 32 is disposed in the air passage 45. The heat exchanger 32 is attached to the inner surface 41a of the upper wall 41, for example, and is formed in a cylindrical shape extending in the negative direction along the Z axis. The heat exchanger 32 includes, for example, pipes and fins through which the refrigerant flows. The heat exchanger 32 causes heat exchange between the air passing through the heat exchanger 32 and the refrigerant to warm or cool the air. The heat exchanger 32 is not limited to this example.

  The motor 33 is, for example, a DC motor capable of changing the rotation speed by inverter control. The motor 33 is attached to the inner surface 41 a of the upper wall 41. For example, the motor 33 is attached to a bolt extending from the inner surface 41a with a nut.

  The motor 33 has a shaft 33a. The shaft 33a may be referred to as a drive shaft or a rotation shaft, for example. The shaft 33a extends in the negative direction along the Z axis. The motor 33 is driven to rotate the shaft 33a around the central axis of the shaft 33a.

  The turbo fan 34 is disposed in the air passage 45 and is surrounded by the heat exchanger 32. The turbo fan 34 is made of, for example, a synthetic resin. The turbofan 34 may be made of other materials. The turbo fan 34 includes a hub 51, a support portion 52, a connecting portion 53, a plurality of blades 54, and a shroud 55.

  The hub 51 is formed in a cylindrical shape extending in the direction along the Z axis. The hub 51 is attached to the shaft 33 a of the motor 33 via the bush 36. The support part 52 is formed in an annular shape spreading on the XY plane. The support portion 52 is disposed closer to the upper wall 41 than the hub 51 and surrounds the motor 33.

  The connecting portion 53 is formed in, for example, a substantially truncated cone shape, and connects the end portion of the hub 51 and the inner periphery of the support portion 52. The plurality of blades 54 are arranged in an annular shape and extend from the support portion 52 in the negative direction along the Z axis. The shroud 55 is formed in an annular shape extending on the XY plane, and is connected to the ends of the plurality of blades 54.

  The motor 33 rotates the turbo fan 34 by rotating the shaft 33a. As indicated by the arrows in FIG. 3, the rotating turbo fan 34 sucks indoor air from the air inlet 25 of FIG. 1 and sends the air to the heat exchanger 32. The air heated or cooled by the heat exchanger 32 is supplied into the room from the air supply port 26 of FIG.

  The cap 35 fixes the turbo fan 34 and the bush 36 to the shaft 33 a of the motor 33. For example, the cap 35 is screwed to a male screw formed at the tip of the shaft 33 a and supports the turbo fan 34 and the bush 36.

  FIG. 4 is a perspective view showing the bush 36 of the first embodiment. FIG. 5 is a plan view showing the bush 36 of the first embodiment. FIG. 6 is a cross-sectional view schematically showing the bush 36 and a part of the shaft 33a of the motor 33 according to the first embodiment. As shown in FIGS. 4 to 6, the bush 36 includes an inner cylinder 61, an outer cylinder 62, and three pins 63. The inner cylinder 61 is an example of a first member. The outer cylinder 62 is an example of a second member. The three pins 63 are an example of a plurality of third members.

  The inner cylinder 61 and the outer cylinder 62 are made of a relatively light metal such as an aluminum alloy, for example. That is, the inner cylinder 61 and the outer cylinder 62 are made of the same material, and the Young's modulus of the material of the inner cylinder 61 and the Young's modulus of the material of the outer cylinder 62 are substantially equal. The inner cylinder 61 and the outer cylinder 62 may be made of other materials such as synthetic resin. Further, the material of the inner cylinder 61 and the material of the outer cylinder 62 may be different.

  The inner cylinder 61 is formed in a substantially cylindrical shape extending in the direction along the Z axis. For this reason, the first opening 71 extending in the direction along the Z axis and penetrating the inner cylinder 61 is provided in the inner cylinder 61. The first opening 71 is not limited to a hole penetrating the inner cylinder 61 but may be a hole with a bottom.

  As shown in FIG. 5, the first opening 71 has a substantially circular cross section centered on the first central axis C1. The first central axis C1 is a virtual central axis of the first opening 71 along the Z axis. That is, the first opening 71 is a substantially circular hole extending about the first central axis C1. In other words, the first opening 71 is a hole extending around the first central axis C1. As shown in FIG. 6, in the present embodiment, the first central axis C <b> 1 substantially coincides with the central axis of the shaft 33 a of the motor 33.

  The inner cylinder 61 includes a first inner peripheral surface 61a, a first outer peripheral surface 61b, a first end 61c, a second end 61d, and three first concave surfaces 61e. The first outer peripheral surface 61b is an example of an outer peripheral surface.

  The first inner peripheral surface 61a is a substantially cylindrical surface that defines the first opening 71 and extends around the first central axis C1. In other words, the first inner peripheral surface 61a is a substantially cylindrical surface extending around the first central axis C1. The first inner peripheral surface 61 a faces the first opening 71. The first opening 71 is provided inside the first inner peripheral surface 61a.

  As shown in FIG. 5, the first outer peripheral surface 61b is located on the opposite side of the first inner peripheral surface 61a. The first outer peripheral surface 61b is a substantially cylindrical surface extending about the first central axis C1. In other words, the first outer peripheral surface 61b is a substantially cylindrical surface extending around the first central axis C1. That is, the first inner peripheral surface 61a and the first outer peripheral surface 61b are arranged concentrically. The center of the first inner peripheral surface 61a and the center of the first outer peripheral surface 61b may be different.

  The first outer peripheral surface 61b is formed in a substantially cylindrical shape extending around the first central axis C1, and thus is formed in rotational symmetry about the first central axis C1. Thus, the first central axis C1 is also the symmetry axis of the first outer peripheral surface 61b.

  As shown in FIG. 6, the first end portion 61c is an end portion of the inner cylinder 61 in the negative direction along the Z axis. The first end 61c is a substantially flat surface that faces in the negative direction along the Z-axis. The negative direction along the Z axis is an example of a first direction. Note that the first end portion 61c may be, for example, a curved surface or may have irregularities.

  The second end portion 61d is an end portion of the inner cylinder 61 in the positive direction (the direction indicated by the arrow of the Z axis, the upward direction) along the Z axis that is opposite to the negative direction along the Z axis. The second end portion 61d is a substantially flat surface that faces in the positive direction along the Z axis. The positive direction along the Z axis is an example of the second direction. Note that the second end portion 61d may be, for example, a curved surface or may have irregularities.

  The first opening 71 communicates with the first end portion 61c and the second end portion 61d. In other words, the first opening 71 is opened at the first end 61c, and the first opening 71 is opened at the second end 61d.

  As shown in FIG. 5, the first concave surface 61e is recessed from the first outer peripheral surface 61b so as to protrude in a direction approaching the first central axis C1. For this reason, each of the three first concave surfaces 61e is provided on the first outer peripheral surface 61b, and forms a first recess 72 that opens radially away from the first central axis C1.

  As shown in FIG. 6, the first concave surface 61e is provided from the first end 61c to the second end 61d. In other words, the first concave surface 61e extends in the positive direction along the Z axis from the first end 61c. For this reason, the 1st hollow 72 opens to the 2nd end part 61d while opening to the 1st end part 61c.

  As shown in FIG. 5, the first concave surface 61 e is formed into an arcuate curved surface whose radius decreases as it approaches the second end 61 d from the first end 61 c. That is, the first concave surface 61e is inclined with respect to the Z axis, but the central axes of the plurality of first concave surfaces 61e extend in a direction along the Z axis in parallel with the first central axis C1.

  The radius of the first concave surface 61e decreases in a so-called linear taper shape as it approaches the second end 61d from the first end 61c. For this reason, the gradient of the first concave surface 61e is substantially constant. The gradient of the first concave surface 61e is not limited to this example. The gradient of the first concave surface 61e is the ratio of the radius of the first concave surface 61e to the change in position in the direction in which the central axis of the first concave surface 61e extends (the direction along the Z axis).

  The three first concave surfaces 61e are arranged at equal intervals around the first central axis C1. The arrangement of the three first concave surfaces 61e is not limited to this example. Further, the inner cylinder 61 may have more than three first concave surfaces 61e. When the number of the first concave surfaces 61e is large, the two first concave surfaces 61e adjacent to each other around the first central axis C1 may be close to each other. In this case, a portion (ridge) where the end of one first concave surface 61e and the end of the adjacent first concave surface 61e around the first central axis C1 are connected is the first outer peripheral surface 61b. Form.

  A fitting portion 73 is provided on the inner cylinder 61. The fitting portion 73 protrudes from the first inner peripheral surface 61 a to the inside of the first opening 71. As shown in FIG. 6, the length of the fitting portion 73 is shorter than the length of the first opening 71 in the direction along the Z axis.

  The shaft 33 a of the motor 33 is inserted through the first opening 71. The shaft 33a is a so-called D-cut shaft provided with a notch 33b. When the shaft 33a is passed through the first opening 71, the fitting portion 73 is fitted into the notch 33b. Thereby, the rotation of the shaft 33a is transmitted to the inner cylinder 61.

  The outer cylinder 62 is formed in a substantially cylindrical shape extending in the direction along the Z axis. For this reason, the outer cylinder 62 is provided with a second opening 75 extending in the direction along the Z axis and penetrating the outer cylinder 62. The second opening 75 is not limited to a hole penetrating the outer cylinder 62, and may be a hole with a bottom.

  The second opening 75 has a substantially circular cross section centered on the second central axis C2. That is, the second central axis C2 is a virtual central axis of the second opening 75 along the Z axis, and the second opening 75 is a substantially circular hole extending around the second central axis C2. In other words, the second opening 75 is a hole extending around the second central axis C2.

  The second central axis C2 is a virtual central axis of the second opening 75 along the Z axis. The second central axis C2 is parallel to the first central axis C1 and can be arranged apart from the first central axis C1. In other words, the second central axis C2 can be arranged at a position different from the first central axis C1. For this reason, the 1st opening 71 and the 2nd opening 75 can be arrange | positioned in the position mutually eccentric. Note that the second central axis C2 may be inclined with respect to the first central axis C1.

  The outer cylinder 62 has a second inner peripheral surface 62a, a second outer peripheral surface 62b, a third end portion 62c, a fourth end portion 62d, and a plurality of second concave surfaces 62e. The number of second concave surfaces 62e is larger than the number of first concave surfaces 61e.

  The second inner peripheral surface 62a is a substantially cylindrical surface that defines the second opening 75 and extends around the second central axis C2. In other words, the second inner peripheral surface 62a is a substantially cylindrical surface extending around the second central axis C2. The second inner peripheral surface 62 a faces the second opening 75. The second opening 75 is provided inside the second inner peripheral surface 62a.

  The second inner peripheral surface 62a is formed in a substantially cylindrical shape extending around the second central axis C2, so that it is formed in rotational symmetry about the second central axis C2. Thus, the second central axis C2 is also a symmetry axis of the second inner peripheral surface 62a.

  As shown in FIG. 5, the inner cylinder 61 is accommodated in the second opening 75. The radius of the second opening 75 is longer than the radius of the first outer peripheral surface 61 b of the inner cylinder 61. The inner cylinder 61 is disposed at a position separated from the second inner peripheral surface 62a. For this reason, a gap G is provided between the inner cylinder 61 and the outer cylinder 62.

  The second inner peripheral surface 62 a faces the first outer peripheral surface 61 b at a position separated from the inner cylinder 61. In other words, the second inner peripheral surface 62a and the first outer peripheral surface 61b face each other through the gap G.

  The second outer peripheral surface 62b is located on the opposite side of the second inner peripheral surface 62a. The second outer peripheral surface 62b is a cylindrical surface extending about the second central axis C2. In other words, the second outer peripheral surface 62b is a cylindrical surface extending around the second central axis C2. That is, the second inner peripheral surface 62a and the second outer peripheral surface 62b are arranged concentrically. The center of the second inner peripheral surface 62a may be different from the center of the second outer peripheral surface 62b.

  As shown in FIG. 3, the outer cylinder 62 is formed integrally with the hub 51 of the turbofan 34, for example, by insert molding. In the present embodiment, the second outer peripheral surface 62 b of the outer cylinder 62 is connected to the hub 51 of the turbo fan 34. Note that the outer cylinder 62 and the turbo fan 34 are not limited to this example, and may be formed as one component from the same material, for example.

  As shown in FIG. 6, the third end portion 62c is an end portion of the outer cylinder 62 in the negative direction along the Z axis. The third end 62c is a substantially flat surface facing in the negative direction along the Z axis. Note that the third end portion 62c may be, for example, a curved surface or may have irregularities.

  The fourth end 62d is an end of the outer cylinder 62 in the positive direction along the Z axis. The fourth end 62d is a substantially flat surface that faces in the positive direction along the Z axis. Note that the fourth end portion 62d may be, for example, a curved surface or may have irregularities.

  The second opening 75 communicates with the third end portion 62c and the fourth end portion 62d. In other words, the second opening 75 is opened at the third end 62c, and the second opening 75 is opened at the fourth end 62d.

  As shown in FIG. 5, the second concave surface 62e is recessed from the second inner peripheral surface 62a so as to protrude in the direction away from the second central axis C2. For this reason, each of the plurality of second concave surfaces 62e is provided on the second inner peripheral surface 62a and forms a second recess 76 that opens in the direction toward the second central axis C2.

  As shown in FIG. 6, the second concave surface 62e is provided from the third end 62c to the fourth end 62d. In other words, the second concave surface 62e extends from the third end 62c in the positive direction along the Z axis. For this reason, the second recess 76 opens to the third end 62c and opens to the fourth end 62d.

  As shown in FIG. 5, the second concave surface 62e is formed into an arcuate curved surface that has a radius that decreases from the third end 62c toward the fourth end 62d. That is, the second concave surface 62e is inclined with respect to the Z axis, but the central axis of each of the plurality of second concave surfaces 62e extends in a direction along the Z axis in parallel with the second central axis C2.

  The radius of the second concave surface 62e decreases in a so-called linear taper shape as it approaches the fourth end portion 62d from the third end portion 62c. For this reason, the gradient of the second concave surface 62e is substantially constant. The gradient of the second concave surface 62e is not limited to this example. The gradient of the second concave surface 62e is the ratio of the radius of the second concave surface 62e to the change in position in the direction in which the central axis of the second concave surface 62e extends (the direction along the Z axis).

  The plurality of second concave surfaces 62e are arranged at equal intervals around the second central axis C2. The arrangement of the plurality of second concave surfaces 62e is not limited to this example. In the present embodiment, two second concave surfaces 62e adjacent to each other around the second central axis C2 are close to each other. A portion (edge) where the end of one second concave surface 62e and the end of the adjacent second concave surface 62e around the second central axis C2 are connected forms the second inner peripheral surface 62a. To do.

  The pin 63 is made of a synthetic resin such as a silicon resin, for example. For this reason, the Young's modulus of the material of the pin 63 is lower than the Young's modulus of the material of the inner cylinder 61 and lower than the Young's modulus of the material of the outer cylinder 62. The pin 63 is not limited to this example, and may be made of other materials, or may be made of the same material as that of the inner cylinder 61 and the outer cylinder 62.

  As shown in FIG. 6, the pin 63 is formed in a truncated cone shape that extends in the direction along the Z axis and tapers in the positive direction along the Z axis. That is, the pin 63 extends parallel to the first central axis C1 and parallel to the second central axis C2. The pin 63 may be formed in another shape such as a polygonal frustum. The pin 63 has a fifth end 63a, a sixth end 63b, and a peripheral surface 63c.

  The fifth end 63a is an end of the pin 63 in the negative direction along the Z axis. The fifth end 63a is a substantially flat surface that faces in the negative direction along the Z-axis. Note that the fifth end portion 63a may be, for example, a curved surface or may have irregularities.

  The sixth end 63b is an end of the pin 63 in the positive direction along the Z axis. The sixth end 63b is a substantially flat surface that faces in the positive direction along the Z-axis. Note that the sixth end portion 63b may be, for example, a curved surface or may have irregularities. The radius of the sixth end 63b is smaller than the radius of the fifth end 63a. In other words, the sixth end 63b is smaller than the fifth end 63a.

  The peripheral surface 63c connects the edge of the fifth end 63a and the edge of the sixth end 63b. The peripheral surface 63c is a truncated cone-shaped cylindrical surface that extends in the direction along the Z-axis and tapers in the positive direction along the Z-axis.

  The radius of the peripheral surface 63c of the pin 63 becomes smaller in a so-called linear taper shape as it approaches the sixth end 63b from the fifth end 63a. For this reason, the gradient of the peripheral surface 63c of the pin 63 is substantially constant. The gradient of the peripheral surface 63c is not limited to this example. The gradient of the peripheral surface 63c is the ratio of the radius of the peripheral surface 63c to the change in position in the direction in which the central axis of the peripheral surface 63c extends (the direction along the Z axis).

  The gradient of the peripheral surface 63c of the pin 63 is substantially equal to the gradient of the first concave surface 61e. Furthermore, the gradient of the peripheral surface 63c is substantially equal to the gradient of the second concave surface 62e. The gradient of the peripheral surface 63c, the gradient of the first concave surface 61e, and the gradient of the second concave surface 62e may be different from each other.

  As shown in FIG. 5, the three pins 63 are arranged in the gap G. Each of the three pins 63 is in contact with one of the three first concave surfaces 61e and one of the plurality of second concave surfaces 62e. In other words, a part of the pin 63 is fitted in the first recess 72. Furthermore, the other part of the pin 63 is fitted in the second recess 76.

  As described above, the gradient of the peripheral surface 63c, the gradient of the first concave surface 61e, and the gradient of the second concave surface 62e are equal. For this reason, the peripheral surface 63c of the pin 63 makes line contact or surface contact with the first concave surface 61e and the second concave surface 62e. The peripheral surface 63c of the pin 63 may make point contact with the first concave surface 61e and the second concave surface 62e.

  When the radius of the pin 63 is larger than the radii of the first and second concave surfaces 61e and 62e, the pin 63 makes line contact with the ends of the first and second concave surfaces 61e and 62e. However, for example, when the Young's modulus of the material of the pin 63 is low, the pin 63 can come into surface contact with the first and second concave surfaces 61e and 62e.

  Each of the three pins 63 pushes the inner cylinder 61 toward the first central axis C1. Thereby, the three pins 63 restrict the movement of the inner cylinder 61 relative to the outer cylinder 62 in a direction intersecting the first central axis C1. Further, the three pins 63 restrict the inner cylinder 61 from rotating around the first central axis C <b> 1 with respect to the outer cylinder 62. In other words, the three pins 63 hold the inner cylinder 61 with respect to the outer cylinder 62.

  The shaft 33a of the motor 33 inserted through the first opening 71 causes the inner cylinder 61, the pin 63, and the outer cylinder 62 to pass through because the peripheral surface 63c contacts the first concave surface 61e and the second concave surface 62e. Accordingly, rotation (torque) can be transmitted to the turbo fan 34.

  The peripheral surface 63c may be fixed to the first concave surface 61e and the second concave surface 62e by, for example, an adhesive. Thereby, the three pins 63 can hold the inner cylinder 61 more firmly than the outer cylinder 62.

  In the present embodiment, the first central axis C1 is disposed at a position separated from the second central axis C2. In this case, the sizes of the three pins 63 are different. Hereinafter, the three pins 63 are individually referred to as a first pin 63A, a second pin 63B, and a third pin 63C.

  The gradient of the peripheral surface 63c of the first pin 63A, the gradient of the peripheral surface 63c of the second pin 63B, and the gradient of the peripheral surface 63c of the third pin 63C are substantially equal. The gradient of the peripheral surface 63c of the first to third pins 63A to 63C is substantially equal to the gradient of the first and second concave surfaces 61e and 62e.

  On the other hand, the radius of the fifth end 63a of the first pin 63A is shorter than the radius of the fifth end 63a of the second pin 63B and the fifth end 63a of the third pin 63C. Shorter than the radius. Further, the radius of the sixth end 63b of the first pin 63A is shorter than the radius of the sixth end 63b of the second pin 63B and the sixth end 63b of the third pin 63C. Shorter than the radius. That is, the first pin 63A is smaller than the second pin 63B and smaller than the third pin 63C.

  The radius of the fifth end 63a of the third pin 63C is longer than the radius of the fifth end 63a of the first pin 63A and is larger than the radius of the fifth end 63a of the second pin 63B. Also long. Further, the radius of the sixth end 63b of the third pin 63C is longer than the radius of the sixth end 63b of the first pin 63A, and the sixth end 63b of the second pin 63B. Longer than the radius. That is, the third pin 63C is larger than the first pin 63A and larger than the second pin 63B.

  The distance between the first concave surface 61e and the second concave surface 62e with which the first pin 63A contacts is the distance between the first concave surface 61e with which the second pin 63B contacts and the second concave surface 62e. Shorter than the distance between the first concave surface 61e and the second concave surface 62e with which the third pin 63C contacts. Furthermore, the distance between the first concave surface 61e that the third pin 63C contacts and the second concave surface 62e is the distance between the first concave surface 61e and the second concave surface 62e that the first pin 63A contacts. Longer than the distance between the first concave surface 61e and the second concave surface 62e with which the second pin 63B contacts.

  The first to third pins 63A to 63C hold the inner cylinder 61 with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2. In other words, the first to third pins 63A to 63C hold the inner cylinder 61 with respect to the outer cylinder 62 at a position where the inner cylinder 61 and the outer cylinder 62 are eccentric from each other. When the sizes of the three pins 63 are equal, the three pins 63 are in relation to the outer cylinder 62 in a state where the first central axis C1 is disposed at the same position as the second central axis C2. The inner cylinder 61 is held. In other words, the three pins 63 hold the inner cylinder 61 with respect to the outer cylinder 62 in a state where the inner cylinder 61 and the outer cylinder 62 are arranged concentrically.

  Hereinafter, a first example of the method for manufacturing the bush 36 will be described with reference to FIGS. 7 and 8. FIG. 7 is an exploded perspective view showing the inner cylinder 61, the outer cylinder 62, and the three pins 63 of the first embodiment.

  As shown in FIG. 7, before the bushing 36 is assembled, the three pins 63 have substantially the same shape. Hereinafter, the pin 63 before the bush 36 is assembled is referred to as a pin 63X. In the direction along the Z axis, the length of the pin 63X is longer than the length of the inner cylinder 61 and longer than the length of the outer cylinder 62.

  For example, the position of the center of gravity of the turbofan 34 may be different from the position of the center of the outer cylinder 62 (second central axis C2) due to the displacement of the outer cylinder 62 during insert molding. The inner cylinder 61, the outer cylinder 62, and the pin 63 of the bush 36 correspond to the position of the central axis of the shaft 33a of the motor 33 and the turbo fan according to the position of the center of gravity of the turbo fan 34 formed integrally with the outer cylinder 62. It is assembled so that the position of the center of gravity of 34 matches. In other words, the bush 36 is assembled so that the position of the first central axis C1 matches the position of the center of gravity of the turbofan 34.

  First, the position of the center of gravity of the turbo fan 34 is measured by placing the turbo fan 34 on three pressure sensors arranged in a triangular shape. The position of the center of gravity of the turbo fan 34 is not limited to this example, and may be measured by rotating the turbo fan 34, for example.

  Next, the inner cylinder 61 and the outer cylinder 62 are arranged so that the position of the first central axis C1 and the position of the center of gravity of the turbofan 34 coincide. The center of gravity of the turbo fan 34 may be at any position on the first central axis C1 along the Z axis. That is, the position of the center of gravity of the turbofan 34 is the position of the first central axis C1 when viewed in a plan view in the direction in which the first central axis C1 extends (a positive direction along the Z axis or a negative direction along the Z axis). Matched with.

  Next, the three pins 63X are inserted into the gap G in a state where the position of the first central axis C1 and the position of the center of gravity of the turbo fan 34 coincide. Each of the three pins 63X is brought into contact with one of the three first concave surfaces 61e and one of the plurality of second concave surfaces 62e.

  The first concave surface 61e extends so as to approach the outer cylinder 62 as it approaches the second end 61d from the first end 61c. On the other hand, the second concave surface 62e extends so as to approach the inner cylinder 61 as it approaches the fourth end portion 62d from the third end portion 62c. The first concave surface 61e and the second concave surface 62e face each other so that a virtual hole H is formed. FIG. 7 shows the hole H with a two-dot chain line for the sake of explanation.

  The hole H is formed in, for example, a substantially circular shape or a distorted circular shape. By inserting the pin 63X into the corresponding hole H, regardless of the radius of the hole H, the pin 63X has one of the three first concave surfaces 61e, one of the plurality of second concave surfaces 62e, To touch.

  FIG. 8 is a perspective view showing the inner cylinder 61 and the outer cylinder 62 through which the pin 63X of the first embodiment is inserted. As shown in FIG. 8, the positions of the three pins 63X in the direction along the Z axis according to the distance (the radius of the hole H) between the first concave surface 61e and the second concave surface 62e forming the hole H. Is different. For example, the larger the radius of the hole H, the deeper the pin 63X is inserted into the hole H.

  When the radius of the hole H is large, the portion where the radius of the pin 63X is large comes into contact with the first concave surface 61e and the second concave surface 62e that form the hole H. On the other hand, when the radius of the hole H is small, the portion where the radius of the pin 63X is small comes into contact with the first concave surface 61e and the second concave surface 62e that form the hole H. Accordingly, the three pins 63X hold the inner cylinder 61 with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2.

  Next, the portion of the pin 63X that protrudes from the inner cylinder 61 and the outer cylinder 62 is cut. For example, the pin 63X is cut at the position of the first end 61c and the position of the second end 61d in the direction along the Z axis. Since the pin 63X is made of silicon resin, it can be easily cut.

  When the pin 63X is cut, a part of the pin 63X that contacts the first concave surface 61e and the second concave surface 62e remains in the gap G. Part of the remaining three pins 63X forms a first pin 63A, a second pin 63B, and a third pin 63C, and the first central axis C1 is spaced from the second central axis C2. Thus, the inner cylinder 61 is held with respect to the outer cylinder 62.

  Thus, the bush 36 is assembled, and the position of the first central axis C1 and the position of the center of gravity of the turbofan 34 are matched. As a result, vibrations in the rotating turbo fan 34 are suppressed. Even if the position of the first central axis C1 and the position of the center of gravity of the turbofan 34 are different, the position of the first center axis C1 is brought closer to the position of the center of gravity of the turbofan 34, thereby rotating the turbofan. The vibration generated in 34 is reduced.

  Hereinafter, a second example of the manufacturing method of the bush 36 will be illustrated. In addition, the manufacturing method of the bush 36 is not restricted to the said 1st example and the following 2nd examples, Other methods may be used. The following second example is used, for example, when the motor 33 is large.

  First, as in the first example, the position of the center of gravity of the turbofan 34 is measured. Next, the inner cylinder 61 and the outer cylinder 62 are arranged so that the position of the first central axis C1 and the position of the center of gravity of the turbofan 34 coincide.

  Next, or in advance, the distance between the first concave surface 61e and the second concave surface 62e forming the hole H into which the pin 63 is inserted is confirmed. The arrangement of the inner cylinder 61 and the outer cylinder 62 and the confirmation of the distance between the first concave surface 61e and the second concave surface 62e may be actually performed or performed on the CAD, for example. It may be broken.

  One of the three holes H is disposed at a position where the inner cylinder 61 and the outer cylinder 62 are farthest apart. The other two of the three holes H are arranged so that the three holes H are arranged at the vertices of a substantially equilateral triangle. The size (radius) of each of the three pins 63 is determined according to the distance between the first concave surface 61e and the second concave surface 62e.

  Next, the mass of the pin 63 is calculated. The mass of the pin 63 is calculated based on, for example, the maximum radius and the minimum radius of the pin 63, the length of the pin 63 in the direction along the Z axis, and the material of the pin 63.

  Next, based on the mass of the pin 63, the mass of the inner cylinder 61, and the mass of the outer cylinder 62, the position of the center of gravity of the turbo fan 34 with the bush 36 attached is calculated. That is, the influence of the mass of the pin 63 is fed back, and the position of the center of gravity of the turbo fan 34 with the bush 36 attached is recalculated.

  Next, the inner cylinder 61 and the outer cylinder 62 are rearranged so that the position of the first central axis C1 matches the calculated position of the center of gravity of the turbofan 34. Thereafter, as in the first example, the inner cylinder 61 is positioned relative to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2 by the three pins 63X inserted into the holes H. Retained. By cutting the pin 63X, the first pin 63A, the second pin 63B, and the third pin 63C are formed.

  In the air conditioner 10 according to the first embodiment described above, the plurality of pins 63 are in contact with one of the plurality of first concave surfaces 61e and one of the plurality of second concave surfaces 62e, The inner cylinder 61 is held with respect to the outer cylinder 62 at a position where the first central axis C 1 of the inner cylinder 61 is separated from the second central axis C 2 of the outer cylinder 62. Accordingly, the inner cylinder 61 can be easily held with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2. That is, the position (the amount of eccentricity) of the first central axis C1 with respect to the second central axis C2 can be adjusted. Thereby, for example, the position of the first central axis C1 can be matched with the position of the center of gravity of the rotating body such as the turbo fan 34 to which the bush 36 is attached, and vibration of the turbo fan 34 is suppressed. The Therefore, the generation of noise due to vibration is suppressed. Further, the center of gravity adjustment work by attaching a weight (balancer) is not required, and a complicated reinforcing structure for suppressing vibration is not required, so that the manufacturing cost of a rotary machine such as the air conditioner 10 having the bush 36 is reduced. To do. Further, the pin 63 comes into contact with the first concave surface 61e and the second concave surface 62e, whereby the inner cylinder 61 is suppressed from rotating with respect to the outer cylinder 62.

  The first concave surface 61e extends so as to approach the outer cylinder 62 as it approaches the second end 61d from the first end 61c. The second concave surface 62e extends so as to approach the inner cylinder 61 as it approaches the fourth end portion 62d from the third end portion 62c. That is, the first concave surface 61e and the second concave surface 62e form a virtual hole H that tapers in the positive direction along the Z axis. By inserting the pin 63 into the hole H, the pin 63 comes into contact with the first concave surface 61e and the second concave surface 62e. Since the hole H is tapered, for example, even if the size (radius) of the pin 63 set to be constant is somewhat different from the size (radius) at a certain position of the hole H, the pin 63 is The first concave surface 61e and the second concave surface 62e can be contacted at any position. This limits the increase in the types of sizes of the prepared pins 63.

  The pin 63 tapers in the positive direction along the Z axis. When the pin 63 is sufficiently long in the direction along the Z-axis, the pin 63 is a positive electrode along the Z-axis regardless of the size of the virtual hole H formed by the first concave surface 61e and the second concave surface 62e. It is possible to contact the first concave surface 61e and the second concave surface 62e that form the hole H that tapers in the direction. As a result, an increase in the types of sizes of the prepared pins 63 is limited. For example, at one position where the first central axis C1 is separated from the second central axis C2 by one type of pin 63, the outer cylinder The inner cylinder 61 can be held with respect to 62.

  The first concave surface 61e is formed into an arcuate curved surface whose radius decreases as it approaches the second end portion 61d from the first end portion 61c. The second concave surface 62e is formed into an arcuate curved surface whose radius decreases as it approaches the fourth end portion 62d from the third end portion 62c. The pin 63 is formed in a truncated cone shape that tapers in the positive direction along the Z-axis. Thereby, the pin 63 and the 1st concave surface 61e and the 2nd concave surface 62e are easy to contact more stably. Therefore, the pin 63 can stably hold the inner cylinder 61 with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2.

  The gradient of the first concave surface 61e, the gradient of the second concave surface 62e, and the gradient of the pin 63 are equal. Thereby, the pin 63 and the 1st concave surface 61e and the 2nd concave surface 62e can carry out a line contact or a surface contact more reliably. Therefore, the pin 63 can stably hold the inner cylinder 61 with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2.

  The Young's modulus of the material of the pin 63 is lower than the Young's modulus of the material of the inner cylinder 61 and the outer cylinder 62. For this reason, the pin 63 can be reliably brought into contact with the first concave surface 61e and the second concave surface 62e by being elastically deformed.

  In the present embodiment, the first central axis C1 that is the center of the first outer peripheral surface 61b is a symmetry axis of the first outer peripheral surface 61b formed in rotational symmetry. When the first outer peripheral surface 61b is not rotationally symmetric, the first central axis C1 passes through the center of the arc-shaped portion of the first outer peripheral surface 61b. When the first outer peripheral surface 61b includes a plurality of arc-shaped portions, the first central axis C1 passes through the center of the arc-shaped portion having the center closest to the center of gravity of the first outer peripheral surface 61b.

  In the above description, the case where the first outer peripheral surface 61b has an arc-shaped portion has been described, but the first outer peripheral surface 61b may not have an arc-shaped portion. In this case, the first central axis C1 passes through the symmetry axis of the largest rotationally symmetric shape formed by the first outer peripheral surface 61b. When the shape of the first outer peripheral surface 61b does not apply to any of the above cases, the first central axis C1 passes through the center of gravity of the first outer peripheral surface 61b.

  A plurality of second concave surfaces 62e are provided on the second inner peripheral surface 62a. The second central axis C2 passes through the center of the second opening 75 in a portion having a circular cross section where no depression or protrusion is provided. Further, as in the present embodiment, the second concave surface 62e may be provided over the entire area of the second inner peripheral surface 62a in the direction along the Z axis. In this case, the second central axis C <b> 2 passes through the center of the arc-shaped portion in the cross section of the second opening 75. When the cross section of the second opening 75 includes a plurality of arc-shaped portions, the second central axis C2 is an arc-shaped portion having a center closest to the center of gravity of the second opening 75 (second inner peripheral surface). It passes through the center of 62a).

  In the above description, the case where the cross section of the second opening 75 has a circular or arcuate portion has been described, but the cross section of the second opening 75 may not have an arcuate portion. In this case, the second central axis C <b> 2 passes through the symmetry axis of the second opening 75 in a portion having a rotationally symmetric cross section where no depression or protrusion is provided. Moreover, a dent and protrusion may be provided in the whole area of the 2nd internal peripheral surface 62a in the direction in alignment with a Z-axis. In this case, the second central axis C2 passes through the symmetry axis of the largest rotationally symmetric shape formed by the cross section of the second opening 75. When the shape of the second opening 75 does not apply to any of the above cases, the second central axis C <b> 2 passes through the center of gravity of the cross section of the second opening 75.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIG. In the following description of the plurality of embodiments, components having the same functions as the components already described are denoted by the same reference numerals as those described above, and further description may be omitted. . In addition, a plurality of components to which the same reference numerals are attached do not necessarily have the same functions and properties, and may have different functions and properties according to each embodiment.

  FIG. 9 is a plan view showing the bush 36 according to the second embodiment. As shown in FIG. 9, the bush 36 of the second embodiment further includes a filler 81. The filler 81 is an example of a fourth member. The filler 81 is made of, for example, a thermoplastic or thermosetting synthetic resin such as foamed plastic or urethane resin. The filler 81 is not limited to this example, and may be made of another material such as an adhesive.

  The filler 81 is filled in the gap G between the inner cylinder 61 and the outer cylinder 62 by, for example, insert molding. More specifically, the filler 81 is filled in a space S surrounded by the inner cylinder 61, the outer cylinder 62, and two pins 63 adjacent to each other around the first central axis C1 with a space therebetween. In the present embodiment, the three spaces S are arranged around the first central axis C1. Adjacent spaces S are separated by pins 63.

  The filled material 81 is in contact with the first outer peripheral surface 61 b of the inner cylinder 61, the second inner peripheral surface 62 a and the plurality of second concave surfaces 62 e of the outer cylinder 62, and the peripheral surface 63 c of the pin 63. It can be cured in the state. The cured filler 81 restricts the relative movement of the inner cylinder 61, the outer cylinder 62, and the three pins 63.

  A first concave portion 83 is provided in each of the plurality of first concave surfaces 61e. A plurality of first recesses 83 may be provided on each of the plurality of first recess surfaces 61e. The first concave portion 83 is recessed from the first concave surface 61e in a substantially semicircular shape that is convex in a direction approaching the first central axis C1.

  The first recess 83 is provided from the first end 61c to the second end 61d. In other words, the first recess 83 extends in the positive direction along the Z axis from the first end 61c. For this reason, the first recess 83 opens at the first end 61c and opens at the second end 61d. The radius of the first recess 83 is constant regardless of the change in position in the direction along the Z axis.

  A second recessed portion 84 is provided in each of the plurality of second recessed surfaces 62e. A plurality of second concave portions 84 may be provided in each of the plurality of second concave surfaces 62e. The second concave portion 84 is recessed from the second concave surface 62e in a substantially semicircular shape convex in a direction away from the second central axis C2.

  The second recess 84 is provided from the third end 62c to the fourth end 62d. In other words, the second recess 84 extends in the positive direction along the Z axis from the third end 62c. For this reason, the second recess 84 opens to the third end 62c and opens to the fourth end 62d. The radius of the second recess 84 is constant regardless of the change in position in the direction along the Z axis.

  Each of the three pins 63 has a first convex portion 86 and a second convex portion 87. The first protrusion 86 and the second protrusion 87 protrude from the peripheral surface 63 c so as to protrude in the direction away from the central axis of the pin 63. The second protrusion 87 protrudes in the direction opposite to the first protrusion 86. Note that the second convex portion 87 may protrude in another direction.

  The 1st convex part 86 and the 2nd convex part 87 have a substantially semicircular cross section, for example. The 1st convex part 86 and the 2nd convex part 87 are provided ranging from the 5th edge part 63a to the 6th edge part 63b. The respective radii of the first convex portion 86 and the second convex portion 87 are constant regardless of the position change in the direction along the Z axis. In addition, the shape of the 1st convex part 86 and the 2nd convex part 87 is not restricted to this example.

  As in the first embodiment, the pin 63 is inserted into the hole H and contacts one of the plurality of first concave surfaces 61e and one of the plurality of second concave surfaces 62e. The 1st convex part 86 is put in the 1st recessed part 83 provided in the said 1st concave surface 61e. On the other hand, the 2nd convex part 87 is put in the 2nd recessed part 84 provided in the said 2nd concave surface 62e.

  The first convex portion 86 is held in the first concave portion 83, and the second convex portion 87 is held in the second concave portion 84. As a result, the rotation of the pin 63 in contact with the first concave surface 61e and the second concave surface 62e is restricted, and the pin 63 gets over the first concave surface 61e and the second concave surface 62e to the first center. Movement about axis C1 is restricted.

  In the air conditioner 10 of the second embodiment described above, the first concave surface 61e is provided with the first concave portion 83 extending in the negative direction along the Z axis from the first end portion 61c. A second concave portion 84 extending in the negative direction along the Z axis from the third end portion 62c is provided in the second concave surface 62e. The pin 63 includes a first convex portion 86 that is inserted into the first concave portion 83, and a second convex portion 87 that is inserted into the second concave portion 84. Thereby, when a torque acts relatively on the inner cylinder 61 and the outer cylinder 62, the pin 63 is prevented from getting over the first concave surface 61e or the second concave surface 62e. Therefore, the inner cylinder 61 and the outer cylinder 62 can more reliably transmit torque to each other via the plurality of pins 63.

  A filler 81 is filled between the inner cylinder 61 and the outer cylinder 62. As a result, the inner cylinder 61 can be more securely held with respect to the outer cylinder 62 at a position where the first central axis C1 of the inner cylinder 61 is separated from the second central axis C2 of the outer cylinder 62. Become.

(Third embodiment)
The third embodiment will be described below with reference to FIG. FIG. 10 is a cross-sectional view schematically showing the bush 36 according to the third embodiment. As shown in FIG. 10, the bush 36 of the third embodiment has a plurality of balls 91 instead of the pins 63. The ball 91 is an example of a third member.

  The ball 91 is made of, for example, a synthetic resin such as synthetic rubber. That is, the Young's modulus of the material of the ball 91 is lower than the Young's modulus of the material of the inner cylinder 61 and lower than the Young's modulus of the material of the outer cylinder 62. The ball 91 may be made of other materials.

  The plurality of balls 91 includes a first ball 91A and a second ball 91B shown in FIG. The radius of the first ball 91A is different from the radius of the second ball 91B. The radii of the plurality of balls 91 may be the same.

  Each of the plurality of balls 91 is inserted into a hole H formed by one of the plurality of first concave surfaces 61e and one of the plurality of second concave surfaces 62e, and the first concave surface 61e and the second concave surface 61e. It contacts the concave surface 62e. The ball 91 inserted into the hole H is selected according to the radius of the hole H.

  When the radius of the hole H is smaller than the radius of the ball 91, the ball 91 contacts the first concave surface 61e and the second concave surface 62e at a position closer to the first end portion 61c and the third end portion 62c. To do. On the other hand, when the radius of the hole H is larger than the radius of the ball 91, the ball 91 is closer to the second end portion 61d and the fourth end portion 62d, and the first concave surface 61e and the second concave surface 62e. To touch.

  The plurality of balls 91 press the inner cylinder 61 toward the first central axis C1 by contacting the first and second concave surfaces 61e and 62e. Thereby, the plurality of balls 91 restricts the inner cylinder 61 from moving in the direction intersecting the first central axis C <b> 1 with respect to the outer cylinder 62. Further, the plurality of balls 91 restricts the inner cylinder 61 from rotating around the first central axis C <b> 1 with respect to the outer cylinder 62. In other words, the plurality of balls 91 hold the inner cylinder 61 with respect to the outer cylinder 62.

  When the radii of the plurality of balls 91 are different from each other, the plurality of balls 91 hold the inner cylinder 61 with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2. When the radii of the plurality of balls 91 are equal, the plurality of balls 91 are arranged such that the first cylinder 61 is located at the same position as the second cylinder axis C2 with respect to the outer cylinder 62. Can be held.

  In a state where the plurality of balls 91 hold the inner cylinder 61 with respect to the outer cylinder 62, the filler 81 is filled in the gap G between the inner cylinder 61 and the outer cylinder 62. The filled material 81 includes a first outer peripheral surface 61b and a plurality of first concave surfaces 61e of the inner cylinder 61, a second inner peripheral surface 62a and a plurality of second concave surfaces 62e of the outer cylinder 62, and a ball. It hardens | cures in the state which contacted the surface of 91. FIG. The cured filler 81 restricts relative movement of the inner cylinder 61, the outer cylinder 62, and the plurality of balls 91.

  In the air conditioner 10 of the third embodiment described above, the plurality of balls 91 hold the inner cylinder 61 on the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2. A filler 81 is filled between the inner cylinder 61 and the outer cylinder 62 held by the plurality of balls 91. Thereby, the ball 91 can restrict the relative movement of the inner cylinder 61 and the outer cylinder 62 when the filler 81 is filled.

(Fourth embodiment)
The fourth embodiment will be described below with reference to FIG. FIG. 11 is a plan view showing the bush 36 according to the fourth embodiment. As shown in FIG. 11, the bush 36 of the fourth embodiment has a plurality of stents 95 instead of the pins 63. The stent 95 is an example of a third member. The stent 95 is formed, for example, in a substantially truncated cone shape by a metal net.

  For example, the stent 95 is inserted into the hole H formed by the first concave surface 61e and the second concave surface 62e in a state where a rubber tube that can expand and contract is accommodated. When the rubber tube is expanded, the radius of the stent 95 is expanded, and the stent 95 comes into contact with the first concave surface 61e and the second concave surface 62e. Thereby, the stent 95 holds the inner cylinder 61 with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2. The stent 95 may hold the inner cylinder 61 with respect to the outer cylinder 62 in a state where the first central axis C1 is disposed at the same position as the second central axis C2.

  In a state where the stent 95 holds the inner cylinder 61 with respect to the outer cylinder 62, the filler 81 is filled in the gap G between the inner cylinder 61 and the outer cylinder 62. The rubber tube maintains the shape of the stent 95 against the pressure of the filling material 81 to be filled. After the filling material 81 is filled, the rubber tube is reduced and removed from the inside of the stent 95. The rubber tube may be left inside the stent 95. Further, the filling material 81 may be further filled in the stent 95 from which the rubber tube has been removed.

  In the air conditioner 10 of the fourth embodiment described above, the stent 95 formed in a cylindrical shape by a metal net is in contact with the first concave surface 61e and the second concave surface 62e. Thereby, for example, the inner cylinder 61 is held with respect to the outer cylinder 62 at a position where the first central axis C1 of the inner cylinder 61 is separated from the second central axis C2 of the outer cylinder 62 by one kind of stent 95. It becomes possible to do.

(Fifth embodiment)
The fifth embodiment will be described below with reference to FIG. FIG. 12 is a cross-sectional view schematically showing the bush 36 according to the fifth embodiment. As shown in FIG. 12, the bush 36 of the fifth embodiment has a plurality of tubes 97 instead of the pins 63. The tube 97 is an example of a third member.

  The tube 97 is made of, for example, a synthetic rubber having heat resistance. The tube 97 can be expanded and contracted, for example, by supplying and removing a fluid such as a gas or a liquid therein.

  For example, in a contracted state, the tube 97 is inserted into the hole H formed by the first concave surface 61e and the second concave surface 62e. When the thermosetting or thermoplastic synthetic resin 98 as a fluid is supplied into the tube 97, the tube 97 expands.

  The expanded tube 97 is in contact with the first concave surface 61e and the second concave surface 62e so that the first central axis C1 is separated from the second central axis C2, and the inner cylinder is located with respect to the outer cylinder 62. 61 is held. The tube 97 may hold the inner cylinder 61 with respect to the outer cylinder 62 in a state where the first central axis C1 is disposed at the same position as the second central axis C2.

  As the synthetic resin 98 is cured, the tube 97 is maintained in a substantially cylindrical shape. Even if the tube 97 is damaged, the cured synthetic resin 98 remains between the inner cylinder 61 and the outer cylinder 62. Therefore, the cured synthetic resin 98 can hold the inner cylinder 61 with respect to the outer cylinder 62 at a position where the first central axis C1 is separated from the second central axis C2.

  In the air conditioner 10 of the fifth embodiment described above, the tube 97 that can be expanded and contracted is in contact with the first concave surface 61e and the second concave surface 62e. Thereby, for example, the inner cylinder 61 is held with respect to the outer cylinder 62 at a position where the first central axis C1 of the inner cylinder 61 is separated from the second central axis C2 of the outer cylinder 62 by one type of tube 97. It becomes possible to do.

  According to at least one embodiment described above, the plurality of third members are in contact with one of the plurality of first concave surfaces and one of the plurality of second concave surfaces, respectively. The first member is held with respect to the second member at a position where the first center axis of the member is separated from the second center axis of the second member. This makes it possible to easily hold the first member with respect to the second member at a position where the first central axis is separated from the second central axis. For example, the position of the first central axis Can be made to coincide with the center of gravity of the rotating body to which the bush is attached, and vibration of the rotating body is suppressed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Air conditioning apparatus, 33 ... Motor, 33a ... Shaft, 34 ... Turbo fan, 36 ... Bush, 61 ... Inner cylinder, 61a ... First inner peripheral surface, 61b ... First outer peripheral surface, 61c ... First End, 61d ... second end, 61e ... first concave surface, 62 ... outer cylinder, 62a ... second inner peripheral surface, 62b ... second outer peripheral surface, 62c ... third end, 62d ... 4th edge part, 62e ... 2nd concave surface, 63 ... Pin, 71 ... 1st opening, 75 ... 2nd opening, 81 ... Filler, 83 ... 1st recessed part, 84 ... 2nd recessed part, 86 ... 1st convex part, 87 ... 2nd convex part, 91 ... Ball, 95 ... Stent, 97 ... Tube, C1 ... 1st central axis, C2 ... 2nd central axis.

Claims (10)

A first inner peripheral surface provided with a first opening and facing the first opening; an outer peripheral surface located on the opposite side of the first inner peripheral surface and extending about the first central axis; A first member having a plurality of first concave surfaces recessed from the outer peripheral surface in a convex manner in a direction approaching the first central axis and disposed around the first central axis;
A second opening that extends around the second central axis and that accommodates the first member is provided, faces the second opening and is spaced from the first member on the outer peripheral surface. A second inner peripheral surface that faces, a plurality of second concave surfaces that are recessed from the second inner peripheral surface so as to protrude away from the second central axis and are arranged around the second central axis; A second member having
Each of the second concave surfaces is in contact with one of the plurality of first concave surfaces and one of the plurality of second concave surfaces, and the first central axis is separated from the second central axis. A plurality of third members configured to hold the first member relative to a member;
A bush comprising: The first member includes: a first end that opens in the first opening and faces in a first direction; and a second end that faces in a second direction opposite to the first direction. Have
The second member includes a third end portion that opens in the second opening and faces in the first direction, and a fourth end portion in the second direction,
Each of the plurality of first concave surfaces extends from the first end in the second direction so as to approach the second member as it approaches the second end from the first end,
Each of the plurality of second concave surfaces extends in the second direction from the third end so as to approach the first member as it approaches the fourth end from the third end.
The bushing of claim 1.   The bush of claim 2, wherein each of the plurality of third members tapers in the second direction. Each of the plurality of first concave surfaces is formed in an arcuate curved surface having a radius that decreases from the first end toward the second end,
Each of the plurality of second concave surfaces is formed in an arcuate curved surface having a radius that decreases from the third end to the fourth end,
Each of the plurality of third members is formed in a truncated cone shape that tapers in the second direction.
The bushing according to claim 3.   5. The bushing of claim 4, wherein the slopes of the plurality of first concave surfaces, the slopes of the plurality of second concave surfaces, and the slopes of the plurality of third members are equal. Each of the plurality of first concave surfaces is provided with a first concave portion extending from the first end portion in the second direction,
Each of the plurality of second concave surfaces is provided with a second concave portion extending in the second direction from the third end portion,
Each of the plurality of third members includes a first convex portion that is inserted into one of the plurality of first concave surfaces, and the second one of the plurality of second concave surfaces. A second convex part to be inserted into the concave part of
The bush according to any one of claims 2 to 5.   The Young's modulus of the material of the plurality of third members is lower than the Young's modulus of the material of the first member and lower than the Young's modulus of the material of the second member. Any one bush.   The bush according to any one of claims 1 to 7, further comprising a fourth member filled between the first member and the second member. A bush according to any one of claims 1 to 8,
A power source having a shaft inserted through the first opening and capable of rotating the shaft;
A rotating machine. A bush according to any one of claims 1 to 8,
A power source having a shaft inserted through the first opening and capable of rotating the shaft;
A fan connected to the second member;
An air conditioner comprising:

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