CN211259355U

CN211259355U - Bearing structure of motor, motor and indoor unit of air conditioner

Info

Publication number: CN211259355U
Application number: CN201890000831.0U
Authority: CN
Inventors: 月田顺司; 藤井浩和; 小川达也
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2017-06-30
Filing date: 2018-06-26
Publication date: 2020-08-14
Anticipated expiration: 2028-06-26
Also published as: JP2019011819A; WO2019004159A1; JP6610619B2

Abstract

The utility model discloses a bearing structure of motor, motor and indoor set of air conditioner can restrain and assemble man-hour. The bearing structure of the motor, namely, the 1 st bearing structure (91) mainly comprises a1 st bearing (91a), a 2 nd bearing (91b), a1 st retaining member (92a), a 2 nd retaining member (92b) and an elastic body (93). The bearings (91a, 91b) are disposed along the axial direction of the first transmission shaft (22 c). The bearing holding members (92a, 92b) support the bearings (91a, 91b), respectively. The elastic body (93) is sandwiched between the bearings (91a, 91b) adjacent in the axial direction, and is surrounded by the 2 nd holding member (92 b). A1 st length (L1), which is a radial distance between the outermost portion (93b) of the elastic body (93) and the 2 nd holding member (92b), is shorter than a 2 nd length (L2), which is a radial distance between the outermost portion (93b) of the elastic body (93) and the 1 st drive shaft (22 c). The 1 st length (L1) is shorter than the 3 rd length (L3) which is the radial distance between the innermost part (93a) of the elastic body (93) and the 1 st transmission shaft (22 c).

Description

Bearing structure of motor, motor and indoor unit of air conditioner

Technical Field

The present invention relates to a bearing structure of a motor, particularly to a bearing structure of a motor for supporting a transmission shaft, and to an indoor unit of an air conditioner having the motor and the motor with the bearing structure.

Background

A plurality of conventional bearings for supporting and freely rotating a drive shaft are generally bearing structures of a motor arranged in an axial direction of the drive shaft. For example, a bearing structure of a motor disclosed in patent document 1 (japanese patent application laid-open No. 2011-89533) includes 2 bearings held by a bearing holding member, and an elastic body interposed between the 2 bearings. Due to the elastic force of the elastic body, the bearing is pressed against the bearing holding member, and the bearing can freely tilt with respect to the bearing holding member.

SUMMERY OF THE UTILITY MODEL

Problem to be solved by the utility model

In the assembly process of the bearing structure disclosed in patent document 1 (japanese patent application laid-open publication No. 2011-89533), high accuracy is required for positioning the elastic body in the radial direction of the transmission shaft. This is because if the radial position of the elastic body is not properly controlled, the bearing cannot receive the elastic force of the elastic body uniformly in the radial direction, and the inclination of the bearing may be hindered. However, the management of the position of the elastic body in the assembly process of the bearing structure requires time, which increases the number of steps.

An object of the utility model is to provide a can restrain the bearing arrangement of the motor during equipment man-hour to and possess the motor of this bearing arrangement and possess the indoor set of the air conditioner of this motor.

Means for solving the problems

The utility model discloses a motor bearing structure of aspect 1 is the bearing structure who supports the transmission shaft, possesses a plurality of bearings and bearing holding member and elastomer. The plurality of bearings are arranged in the axial direction of the drive shaft and rotatably support the drive shaft. The bearing holding member holds the bearing. The elastomer is sandwiched between axially adjacent bearings along the drive shaft. The elastic body is surrounded by the bearing holding member. The elastic body presses the bearing toward the bearing holding member. The elastic body has an innermost portion closest to the propeller shaft in a radial direction of the propeller shaft, and an outermost portion closest to the bearing holding member in the radial direction of the propeller shaft. A radial distance between an outermost portion of the elastic body and the bearing holding member, i.e., a1 st length, is shorter than a radial distance between the outermost portion of the elastic body and the drive shaft, i.e., a 2 nd length. The 1 st length is shorter than the radial distance between the innermost part of the elastic body and the transmission shaft, namely the 3 rd length.

The motor bearing structure of aspect 1, wherein the transmission shaft supporting the elastic body sandwiched between the plurality of bearings is surrounded by the bearing holding member. The gap between the elastic body and the bearing holding member is smaller than the gap between the elastic body and the transmission shaft. Therefore, when the bearing structure is assembled, it is not necessary to strictly manage the position of the elastic body in the radial direction when the elastic body is inserted into the bearing holding member. This makes it possible to omit the required elastic body position management step, and to reduce the number of assembly steps of the bearing structure. Therefore, the motor bearing structure of claim 1 can suppress the number of assembly steps.

The utility model discloses a motor bearing structure of aspect 2 is the motor bearing structure of aspect 1, and wherein, the bearing comprises 1 st bearing and 2 nd bearing. The bearing holding member is composed of a1 st holding portion that holds only the 1 st bearing and a 2 nd holding member that holds only the 2 nd bearing.

The motor bearing structure of claim 2, wherein the constitution in which the 1 st bearing is pressed toward the 1 st holding member and the 2 nd bearing is pressed toward the 2 nd holding member can be easily achieved by an elastic force of an elastic body sandwiched between the 1 st bearing and the 2 nd bearing. Therefore, the motor bearing structure of claim 2 is simple in assembly process.

The utility model discloses a motor bearing structure of aspect 3 is the motor bearing structure of aspect 2, and wherein, 2 nd holding member has the inner peripheral surface that surrounds 1 st bearing, 2 nd bearing and elastomer and contact with 2 nd bearing. The 2 nd holding member has an inner peripheral surface whose radial circumferential length increases at least partially in the axial direction from the 2 nd bearing side to the 1 st bearing side.

The motor bearing structure of the 3 rd aspect, wherein, in assembling the bearing structure, the 2 nd holding member has an inner peripheral surface facilitating the 1 st bearing, the 2 nd bearing, and the elastic body insertion shape. Therefore, the motor bearing structure of claim 3 is simple in assembly process.

The utility model discloses a motor bearing structure of aspect 4 is the motor bearing structure of aspect 3, and wherein, 2 nd retaining member is the resin system.

The motor bearing structure according to claim 4, wherein the 2 nd holding member is molded of a lightweight resin that is less likely to deform by load, and deformation of the 2 nd holding member can be suppressed by the weight of the member connected to the transmission shaft in the horizontal direction. Therefore, the motor bearing structure of claim 4 can prevent the misalignment of the axis of the transmission shaft.

The utility model discloses a motor bearing structure of aspect 5 is the motor bearing structure of aspect 4, and wherein, the 1 st retaining member is the metal system to the 2 nd retaining member of impressing.

The motor bearing structure of claim 5, wherein the 1 st retaining member is firmly fixed to the 2 nd retaining member when the bearing structure is assembled. Therefore, the 1 st bearing and the 2 nd bearing can be prevented from falling off from the 2 nd bearing due to the elastic force of the elastic body, and the 1 st bearing and the 2 nd bearing can not be normally held. Therefore, the motor bearing structure of claim 5 can be expected to extend the service life of the bearing.

The utility model discloses a motor bearing structure of aspect 6 is the motor bearing structure of any one of 1 st to 5 th, and wherein, the 1 st length is zero.

The motor bearing structure of aspect 6, wherein, at the time of assembling the bearing structure, it is not necessary to position the elastic body in the radial direction when inserting the elastic body into the bearing holding member. Therefore, the motor bearing structure of claim 6 is simple in assembly process.

The utility model discloses a motor bearing structure of aspect 7 is the motor bearing structure of any one of 1 st to 6 th, and wherein, the bearing is automatic aligning sliding shaft.

The motor bearing structure according to claim 7, wherein even if there is a radial misalignment in the contact portion between the bearing and the bearing holding member, the self-aligning action of the bearing can relax the dimension of the radial member and disperse the load on the inner peripheral surface of the bearing. Therefore, the motor bearing structure of claim 7 can be expected to extend the service life of the bearing.

The utility model discloses a motor bearing structure of aspect 8 is the motor bearing structure of any one of 1 st to 7 th, and wherein, the elastomer is along the flexible coil spring of axial.

The motor bearing structure of aspect 8, wherein the elastic body expands and contracts in the axial direction, so that the tolerance of the dimension of the axial component is relaxed. Thus, the motor bearing structure of claim 8 can be assembled in a simple process.

The utility model discloses a motor bearing structure of aspect 9 is the motor bearing structure of aspect 8, and wherein, the bearing is pressed to bearing holding member through accepting the disc spring along axial stretching force.

The motor bearing structure of claim 9, wherein the bearing is pressed against the holding member to hold the bearing due to an elastic force of the elastic body. Therefore, the motor bearing structure of claim 9 can be assembled in a simple process.

The utility model discloses a motor of aspect 10, wherein, possess the stator, for the rotatable rotor that supports of stator and be fixed in the transmission shaft on the rotor. The drive shaft is supported by the motor bearing structure of any one of aspects 1 to 9.

The utility model discloses a motor of aspect 10 can restrain the equipment man-hour.

The utility model discloses an indoor unit of air conditioner of aspect 11 wherein, possesses heat exchanger, and makes the room air pass through heat exchanger and send out indoor fan, and the motor of drive fan. The motor is the motor of aspect 10.

The utility model discloses an indoor unit of an air conditioner of the 11 th aspect can restrain the equipment man-hour.

Effect of the utility model

The utility model discloses a motor bearing structure of aspect 1 can restrain and assemble man-hour.

The utility model discloses a motor bearing structure of aspect 2, the equipment process is simple.

The utility model discloses a motor bearing structure of aspect 3, the equipment process is simple.

The utility model discloses a motor bearing structure of aspect 4 can prevent the axle center dislocation of transmission shaft.

The utility model discloses a motor bearing structure of aspect 5 can expect to prolong the life of bearing.

The utility model discloses a motor bearing structure of aspect 6, the equipment process is simple.

The utility model discloses a motor bearing structure of aspect 7 can expect to prolong the life of bearing.

The utility model discloses a motor bearing structure of aspect 8, the equipment process is simple.

The utility model discloses a motor bearing structure of aspect 9, the equipment process is simple.

Description of the drawings:

fig. 1 is an external view of an air conditioner 101 according to the embodiment.

Fig. 2 is a schematic diagram of a refrigerant circuit of the air conditioner 101.

Fig. 3 is a cross-sectional view of the indoor unit 102 viewed from the right side.

Fig. 4 is a schematic plan view of the air blowing unit 18.

Fig. 5 is a detailed sectional view of the cross flow fan 22 and the indoor fan 81 along a line V-V of fig. 4.

Fig. 6 is an enlarged view of the vicinity of the 1 st bearing structure 91 in fig. 5.

Fig. 7 is a perspective view of each member constituting the 1 st bearing structure 91.

Fig. 8 is an enlarged view of the vicinity of the elastic body 93 in fig. 6.

Fig. 9 is a sectional view similar to fig. 6, and is an enlarged view of the vicinity of the 1 st bearing structure 91 of the modification example D.

Detailed Description

An air conditioner 101 having a motor bearing structure according to an embodiment of the present invention will be described below with reference to the drawings.

(1) Air conditioner structure

Fig. 1 is an external view of an air conditioner 101. The air conditioner 101 is mainly composed of an indoor unit 102 mounted on an indoor wall surface or the like, and an outdoor unit 103 installed outdoors. The air conditioner 101 performs a cooling operation and a heating operation for the room in which the indoor unit 102 is installed. Hereinafter, the upper side U, the lower side D, the left side L, the right side R, the front side F, and the rear side B of the indoor unit 102 installed indoors are indicated by arrows in fig. 1 and the like. The front side is a side where a discharge port 71 (described later) is provided. The left side is the left side when the indoor unit 102 is viewed from the front side.

The indoor unit 102 and the outdoor unit 103 are connected to each other by a refrigerant pipe 104, thereby constituting a refrigerant circuit of the air conditioner 101. Fig. 2 is a schematic diagram of a refrigerant circuit of the air conditioner 101. The refrigerant circuit is mainly composed of an indoor heat exchanger 21, a cross flow fan 22, a compressor 31, a four-way switching valve 32, an accumulator 33, an outdoor heat exchanger 34, an expansion valve 35, a filter 36, a liquid side isolation valve 37, a gas side isolation valve 38, and a vane fan 39. The indoor heat exchanger 21 and the cross-flow fan 22 are provided inside the indoor unit 102. The compressor 31, the four-way switching valve 32, the accumulator 33, the outdoor heat exchanger 34, the expansion valve 35, the filter 36, the liquid-side isolation valve 37, the gas-side isolation valve 38, and the vane fan 39 are provided inside the outdoor unit 103. In fig. 2, solid arrows indicate the flow of the refrigerant during the cooling operation, and broken lines indicate the flow of the refrigerant during the heating operation.

The indoor heat exchanger 21 is composed of a heat transfer pipe that is folded back multiple times at both ends in the longitudinal direction thereof, and fins attached to the heat transfer pipe. The indoor heat exchanger 21 performs heat exchange between the refrigerant flowing through the inside of the heat transfer pipe and the air passing through the fins. The indoor heat exchanger 21 functions as an evaporator to cool air passing through the fins during a cooling operation. The indoor heat exchanger 21 functions as a condenser during heating operation, and heats air passing through the fins.

The cross flow fan 22 discharges the air heat-exchanged in the indoor heat exchanger 21 to the indoor. The cross flow fan 22 is driven by an indoor fan motor 81.

The compressor 31 compresses the gaseous refrigerant from the accumulator 33. The refrigerant compressed by the compressor 31 is sent to the outdoor heat exchanger 34 during the cooling operation and sent to the indoor heat exchanger 21 during the heating operation.

The four-way switching valve 32 is a mechanism for switching between a refrigerant circuit during cooling operation and a refrigerant circuit during heating operation.

The accumulator 33 is connected to a suction side of the compressor 31, and separates gas and liquid of the refrigerant before the refrigerant is sucked into the compressor 31. The accumulator 33 prevents the liquid refrigerant from being supplied to the compressor 31.

The outdoor heat exchanger 34 is composed of a heat transfer pipe that is folded back multiple times at both ends in the longitudinal direction thereof, and fins attached to the heat transfer pipe. The outdoor heat exchanger 34 performs heat exchange between the refrigerant flowing through the inside of the heat transfer pipe and the air passing through the fins. The outdoor heat exchanger 34 functions as a condenser during the cooling operation and functions as an evaporator during the heating operation.

The expansion valve 35 is provided at a position through which the refrigerant discharged from the condenser passes before being sucked into the evaporator. The expansion valve 35 decompresses the high-temperature and high-pressure refrigerant discharged from the condenser in the evaporator to a state in which the refrigerant is easily evaporated.

The filter 36 is provided between the expansion valve 35 and the liquid side isolation valve 37, and traps foreign matter contained in the refrigerant flowing through the refrigerant circuit.

The liquid-side isolation valve 37 and the gas-side isolation valve 38 are used for maintenance work such as replacement of the refrigerant in the refrigerant circuit. The liquid-side isolation valve 37 is provided at a position where the refrigerant discharged from the condenser passes before being sucked into the evaporator. The gas-side isolation valve 38 is provided at a position where the refrigerant discharged from the evaporator and sucked into the condenser passes.

The blade fan 39 discharges the air heat-exchanged in the outdoor heat exchanger 34 from the outdoor unit 103. The blade fan 39 is driven by an outdoor fan motor 40.

(2) Structure of indoor unit

The detailed structure of the indoor unit 102 will be described below. Fig. 3 is a sectional view of the indoor unit 102 viewed from the right side. As shown in fig. 1, the indoor unit 102 has a long shape in the lateral direction (the direction toward the left and right sides) when viewed from the front side. The indoor unit 102 mainly includes an upper casing 16, a lower casing 17, an air blowing unit 18, and the indoor heat exchanger 21.

(2-1) Upper casing

The upper casing 16 covers the upper portion of the indoor unit 102. The upper housing 16 has a suction port 61 formed therein. The suction port 61 is formed at the upper side of the indoor unit 102 and the upper front side of the indoor unit 102. The suction port 61 is an opening along the longitudinal direction (lateral direction) of the indoor unit 102. The indoor heat exchanger 21 is provided below the suction port 61 of the upper case 16. Indoor air is drawn into the interior of the indoor unit 102 through the suction port 61.

(2-2) lower casing

The lower casing 17 covers the lower portion of the indoor unit 102. The lower housing 17 is formed with a discharge port 71. The outlet 71 is formed at the lower front portion of the indoor unit 102. The outlet 71 is an opening extending in the longitudinal direction of the indoor unit 102. The air having undergone heat exchange in the indoor unit 102 is discharged into the room through the discharge port 71.

The discharge opening 71 is provided with a horizontal wing 73. The horizontal wings 73 serve to guide the flow of air discharged into the room. The horizontal flaps 73 are driven to rotate about parallel axes in the longitudinal direction of the indoor unit 102 by a flap motor (not shown). The horizontal flaps 73 can open and close the discharge ports 71, and can change the flow direction of the air discharged into the room.

(2-3) air blowing Unit

The blower unit 18 is provided inside the indoor unit 102 and attached to the lower casing 17. The air blowing unit 18 generates an air flow passing through the indoor heat exchanger 21 inside the indoor unit 102.

Fig. 4 is a schematic plan view of the blower unit 18. The air blowing unit 18 mainly has the cross flow fan 22, the indoor fan motor 81, and the electronic component box 75. As shown in fig. 4, the electronic component box 75 is provided on the right side of the indoor unit 102, and the indoor fan motor 81 is provided between the cross flow fan 22 and the electronic component box 75. The electronic component box 75 accommodates a microcomputer and the like that control the respective components of the indoor unit 102. The detailed configuration of the cross flow fan 22 and the indoor fan 81 will be described later.

(2-4) indoor Heat exchanger

The indoor heat exchanger 21 is provided inside the indoor unit 102 so as to face the cross-flow fan 22. Specifically, as shown in fig. 3, the indoor heat exchanger 21 is disposed so as to surround the front, rear, and upper sides of the cross flow fan 22. The indoor heat exchanger 21 exchanges heat with the air sucked through the suction port 61 and the refrigerant circulating through the refrigerant circuit by the operation of the blower unit 18. The air having undergone heat exchange in the indoor heat exchanger 21 is discharged from the discharge port 71 into the room through the blower unit 18.

(3) The cross flow fan and the indoor fan motor are configured in detail.

The cross flow fan 22 and the indoor fan 81 constituting the air blowing unit 18 will be described in detail below. Fig. 5 is a detailed cross-sectional view of the cross flow fan 22 and the indoor fan 81 along the line V-V of fig. 4.

(3-1) Cross flow Fan

The cross flow fan 22 is provided inside the indoor unit 102 and is an elongated cylindrical member. The cross flow fan 22 is molded from a resin such AS resin. As shown in fig. 4 and 5, the cross flow fan 22 has a cylindrical central axis, i.e., a rotation axis a1, disposed horizontally. That is, the rotation axis a1 is along the longitudinal direction of the indoor unit 102. The cross flow fan 22 rotates about the rotation axis a1 to generate an air flow in a direction intersecting the rotation axis a 1. The air flow generated by the cross flow fan 22 draws air from the intake port 61 and discharges the air from the discharge port 71.

The cross flow fan 22 mainly has a1 st end plate 22a, a 2 nd end plate 22b, a1 st drive shaft 22c, a 2 nd drive shaft 22d, and a feather 22 e.

The feather portion 22e is a cylindrical member. The cylindrical central axis of the feather 22e is along the rotation axis a 1. The feather 22e is arranged between the 1 st endplate 22a and the 2 nd endplate 22b in a direction along the rotational axis a 1. The plumes 22e rotate about the rotation axis a1, thereby generating an air flow in a direction intersecting the rotation axis a 1.

The 1 st endplate 22a is mounted to the right end face of the feather portion 22 e. The 1 st end plate 22a is provided with a rotor 82 (described later) of an indoor fan motor 81. Additionally, the 1 st endplate 22a may be integrally formed with the rotor 82. The 2 nd end plate 22b is attached to the left end face of the feather portion 22 e.

The 1 st drive shaft 22c is coupled to the 1 st endplate 22a and is disposed along the rotational axis a 1. The 2 nd drive shaft 22d is coupled to the 2 nd endplate 22b and is disposed along the rotational axis a 1. The 1 st driving shaft 22c is rotatably supported by a1 st bearing structure 91 (described later) of the indoor fan motor 81. The 2 nd transmission shaft 22d is rotatably supported by the 2 nd bearing structure 99. The 2 nd bearing arrangement 99 has a bearing 99a for supporting the 2 nd drive shaft 22 d.

(3-2) indoor Fan Motor

The indoor fan motor 81 supports the 1 st transmission shaft 22c and transmits a rotational force to the cross flow fan 22. Specifically, the indoor fan motor 81 rotationally drives the cross flow fan 22 around the periphery of the rotation axis a. The indoor fan motor 81 mainly has a rotor 82 and a stator 83. The indoor fan motor 81 is an outer rotor type motor. That is, the rotor 82 is located outside the stator 83. A gap is formed between the inner circumferential surface of the rotor 82 and the outer circumferential surface of the stator 83.

The rotor 82 is formed of a resin material containing fine magnet particles. The rotor 82 is rotated by magnetic force generated by the stator 83. The rotor 82 is mounted on the 1 st endplate 22a of the cross flow fan 22. Therefore, the cross flow fan 22 rotates about the rotation axis a1 by the rotation of the rotor 82.

The stator 83 has a stator core 83a and a stator cover 83 b. The stator core 83a is a cylindrical member including a core, a coil, and the like that generate a magnetic field in the rotor 82. The stator cover 83b is a resin molded member that covers a part of the outer peripheral surface of the stator core 83 a. As shown in fig. 5, the stator core 83a has a through hole formed along the cylindrical center axis, and the stator cover 83b covers the inner peripheral surface of the through hole of the stator core 83 a.

The stator 83 is supported by a stator case (not shown). The stator case has a shape accommodating the stator 83, and covers a right end face of the stator 83. The stator 83 may be supported by a vibration-proof member with respect to the stator case. In this case, the vibration-proof member is formed of rubber or the like, and has a function of absorbing vibration of the indoor fan motor 81.

In the present embodiment, the indoor fan motor 81 has the 1 st bearing structure 91 for supporting the 1 st transmission shaft 22c of the cross flow fan 22. The 1 st bearing structure 91 will be described in detail below.

(3-3) the 1 st bearing structure

Fig. 6 is a close-up view of the 1 st bearing structure 91 of fig. 5. The 1 st bearing structure 91 mainly includes a1 st bearing 91a, a 2 nd bearing 91b, a1 st holding member 92a, a 2 nd holding member 92b, and an elastic body 93. Fig. 7 is a perspective view of the respective members constituting the 1 st bearing structure 91. Hereinafter, the axial direction refers to the axial direction of the 1 st drive shaft 22c, that is, the direction along the rotation axis a1 of the cross flow fan 22. Meanwhile, the radial direction refers to the radial direction of the 1 st drive shaft 22c, that is, the direction perpendicularly intersecting the rotational axis a1 of the cross flow fan 22.

The 1 st bearing 91a and the 2 nd bearing 91b support the 1 st transmission shaft 22c in a rotatable state. The 1 st bearing 91a and the 2 nd bearing 91b are spherical bearings which are one kind of self-aligning slide shafts. As shown in fig. 6, the side surfaces of the 1 st bearing 91a and the 2 nd bearing 91b have spherical shapes. The 1 st bearing 91a and the 2 nd bearing 91b have cylindrical through holes penetrating the 1 st transmission shaft 22 c. The 1 st bearing 91a and the 2 nd bearing 91b are disposed with the center axis of the through hole along the axial direction. The 1 st bearing 91a is located on the left side of the 2 nd bearing 91b, i.e., on the side closer to the cross flow fan 22. The 1 st bearing 91a and the 2 nd bearing 91b may be the same. The left end surface of the elastic body 93 contacts the right end surface of the 1 st bearing 91a, and the right end surface of the elastic body 93 contacts the left end surface of the 2 nd bearing 91 b. Both end faces of the elastic body 93 are ground so as to be in contact with the end faces of the 1 st bearing 91a and the 2 nd bearing 91 b. Accordingly, the elastic body 93 can equally apply the axial load to the 1 st bearing 91a and the 2 nd bearing 91b by its own axial elastic force.

The 1 st holding member 92a holds the 1 st bearing 91a, and the 2 nd holding member 92b holds the 2 nd bearing 91 b. The 1 st holding member 92a is made of metal. The 2 nd holding portion 91b is a part of the stator cover 83b, and corresponds to a portion covering the inner peripheral surface of the through hole of the stator core 83 a. That is, the 2 nd holding member 91b is made of resin. The 1 st holding member 92a is press-fitted into the 2 nd holding member 92 b. The 1 st holding member 92a is located on the left side of the 2 nd holding member 92 b. As shown in fig. 6, the 1 st holding member 92a contacts with the side surface of the 1 st bearing 91a, and the 2 nd holding member 92b contacts with the side surface of the 2 nd bearing 91 b.

As shown in fig. 6 and 7, the 1 st holding member 92a includes an annular portion 94a, a wall portion 94b, and an inclined portion 94 c. The wall portion 94b is a portion standing on the left side on the entire outer periphery of the annular portion 94 a. The inclined portion 94c is a portion that rises toward the left side on the entire inner periphery of the annular portion 94 a. As shown in fig. 6, the inclined portion 94c is inclined toward the radially inner side near the rotation axis a1 as it is separated from the annular portion 94 a. The outer peripheral portion of the annular portion 94a and the wall portion 94b contact a step portion 95c (described later) of the 2 nd holding member 92 b. The inclined portion 94c contacts with a side surface of the 1 st bearing 91 a. The inner diameter of the annular portion 94a is smaller than the maximum outer diameter of the 1 st bearing 91 a.

The 2 nd holding member 92b has a bearing inner peripheral surface 95. The bearing inner circumferential surface 95 is a surface surrounding the 1 st bearing 91a, the 2 nd bearing 91b, and the elastic body 93. The bearing inner circumferential surface 95 is composed of a bearing holding portion 95a, an inclined portion 95b, and a step portion 95 c. The bearing holding portion 95a contacts with a side surface of the 2 nd bearing 91 b. The bearing holding portion 95a has a bearing inner peripheral surface 95 whose inner diameter gradually increases from the right side to the left side. The bearing holding portion 95a has a bearing inner peripheral surface 95 having an inner diameter smaller than the maximum outer diameter of the 2 nd bearing 91b at the rightmost side. The inclined portion 95b gradually increases in inner diameter of the bearing inner circumferential surface 95 from the right side to the left side. Inside the inclined portion 95b, there are a1 st bearing 91a, a 2 nd bearing 91b, and an elastic body 93. The step 95c is formed so that the inner diameter of the bearing inner circumferential surface 95 is discontinuously increased in the direction from the right side to the left side, and thereafter is kept constant. The step portion 95c contacts the 1 st holding member 92 a.

The elastic body 93 is a coil spring that extends and contracts in the axial direction through the 1 st transmission shaft 22 c. The elastic body 93 is sandwiched between the 1 st bearing 91a and the 2 nd bearing 91b adjacent to the axial direction. The elastic body 93 is surrounded by the 2 nd holding member 92 b.

The coil spring, i.e., the elastic body 93, is arranged in a compressed state in the axial direction. Therefore, the 1 st bearing 91a and the 2 nd bearing 91b receive elastic forces that are separated from each other in the axial direction from the elastic body 93. That is, the 1 st bearing 91a is pressed against the 1 st holding member 92a and the 2 nd bearing 91b is pressed against the 2 nd holding member 92b by the elastic force of the elastic body 93.

Fig. 8 is an enlarged view of the vicinity of the elastic body 93 of fig. 6. As shown in fig. 8, the elastic body 93 has an innermost portion 93a and an outermost portion 93 b. The innermost portion 93a is a portion closest to the outer peripheral surface of the 1 st transmission shaft 22c in the radial direction. The outermost portion 93b is a portion closest to the bearing inner peripheral surface 95 of the 2 nd holding member 92b in the radial direction. As shown in fig. 6, the elastic body 93, which is a coil spring, has a larger diameter at the center in the axial direction than at both ends in the axial direction. Therefore, the innermost portion 93a is located on the inner periphery of both end portions in the axial direction of the elastic body 93, and the outermost portion 93b is located on the outer periphery of the central portion in the axial direction of the elastic body 93.

In FIG. 8, the 1 st length L1, the 2 nd length L2, and the 3 rd length L3 are shown. The 1 st length L1 is a radial distance between the outermost portion 93b of the elastic body 93 and the bearing inner peripheral surface 95 of the 2 nd holding member 92 b. The 1 st length L1 is the smallest value using the radial distance between the outermost portion 93b and the bearing inner peripheral surface 95. Fig. 8 shows 3 circular cross sections in the axial center of the elastic body 93, which are close to the bearing inner circumferential surface 95. The bearing inner circumferential surface 95 is adjacent to the elastic body 93 in the direction from the left side to the right side. Therefore, in fig. 8, the 1 st length L1 is a radial distance between the rightmost cross section 93c and the bearing inner circumferential surface 95 among 3 cross sections of the axial center portion of the elastic body 93.

The 2 nd length L2 is a radial distance between the outermost portion 93b of the elastic body 93 and the outer circumferential surface of the 1 st transmission shaft 22 c. The 3 rd length L3 is a radial distance between the innermost portion 93a of the elastic body 93 and the outer circumferential surface of the 1 st transmission shaft 22 c. The 1 st length L1 is shorter than the 2 nd length L2 and the 1 st length L1 is shorter than the 3 rd length L3 in the 1 st bearing structure 91. The 1 st length L1 is as short as possible.

In the 1 st bearing structure 91, the 1 st bearing 91a and the 2 nd bearing 91b that support the 1 st transmission shaft 22c are spherical bearings that are one kind of self-aligning sliding shafts. Therefore, regardless of the reason why the 1 st transmission shaft 22c is inclined, the 1 st bearing 91a and the 2 nd bearing 91b may be inclined to the same angle as the 1 st transmission shaft 22c and support the rotating 1 st transmission shaft 22c in an inclined state. This makes it possible to disperse the load received from the 1 st propeller shaft 22c on the inner circumferential surfaces of the 1 st bearing 91a and the 2 nd bearing 91 b.

The assembly process of the 1 st bearing structure 91 will be described below with reference to fig. 6 and 7. First, the 2 nd bearing 91b is inserted into the space inside the bearing inner peripheral surface 95 of the 2 nd holding member 92b of the stator cover 83b from the left side. The 2 nd bearing 91b is inserted to a position in contact with the bearing holding portion 95a of the bearing inner peripheral surface 95. Then, the elastic body 93 is inserted into the space inside the bearing inner circumferential surface 95 from the left side. The elastic body 93 is inserted to a position contacting the left end face of the 2 nd bearing 91 b. Then, the 1 st bearing 91a is inserted into the space inside the bearing inner circumferential surface 95 from the left side. The 1 st bearing 91a is inserted to a position in contact with the left end surface of the elastic body 93. Then, the 1 st holding member 92a is inserted into the space inside the bearing inner circumferential surface 95 from the left side. The 1 st holding member 92a is inserted to a position where it contacts the stepped portion 95c of the bearing inner circumferential surface 95, and is press-fitted and fixed to the 2 nd holding member 92 b. Through the above steps, the 1 st bearing 91a, the 2 nd bearing 91b, and the elastic body 93 are disposed in the space surrounded by the 1 st holding member 92a and the 2 nd holding member 92 b. At this time, the elastic body 93 is disposed between the 1 st bearing 91a and the 2 nd bearing 91b in a state of being compressed in the axial direction.

(4) Characteristics of

(4-1)

The air conditioner 101 of the present embodiment includes an indoor fan motor 81 for driving the cross flow fan 22 of the indoor unit 102, and the 1 st bearing structure 91. The 1 st bearing structure 91 rotatably supports the 1 st transmission shaft 22c of the cross flow fan 22 transmitting the rotational force of the indoor fan motor 81. In the 1 st bearing structure 91, the 1 st propeller shaft 22c is supported by the 1 st bearing 91a and the 2 nd bearing 91 b.

As shown in fig. 6, the 1 st bearing structure 91 has an elastic member 93 sandwiched between the 1 st bearing 91a and the 2 nd bearing 91b and surrounded by a 2 nd holding member 92 b. Further, with respect to the radial position of the elastic body 93, as shown in fig. 8, the 1 st length L1 is shorter than the 2 nd length L2, and the 1 st length L1 is shorter than the 3 rd length L3. The 1 st length L1 corresponds to the size of the gap between the elastic body 93 and the 2 nd holding member 92 b. The 2 nd length L2 and the 3 rd length L3 correspond to the size of the gap between the elastic body 93 and the 1 st driving shaft 22 c. That is, in the 1 st bearing structure 91, the gap between the elastic body 93 and the 2 nd holding member 92b is smaller than the gap between the elastic body 93 and the 1 st transmission shaft 22 c.

Since the gap between the elastic body 93 and the 2 nd holding member 92b is sufficiently small, when the elastic body 93 is inserted into the 2 nd holding member 92b at the time of assembling the 1 st bearing structure 91, it is not necessary to strictly manage the radial position of the elastic body 93. This makes it possible to omit the process required for managing the position of the elastic body 93, and to reduce the number of assembly steps of the 1 st bearing structure 91. Therefore, the number of assembly steps of the indoor fan motor 81 including the 1 st bearing structure 91 can be reduced, and the number of assembly steps of the indoor unit 102 including the indoor fan motor 81 can be reduced.

(4-2)

As shown in fig. 6, the 1 st bearing structure 91 has the 1 st bearing 91a held only by the 1 st holding member 92a, and the 2 nd bearing 91b held only by the 2 nd holding member 92 b. As shown in fig. 7, when the 1 st bearing structure 91 is assembled, the 2 nd bearing 91b, the elastic body 93, and the 1 st bearing 91a are inserted into the inner space of the 2 nd holding member 92b of the stator cover 83b in this order from the left side, and thereafter the 1 st holding member 92a is fixed to the 2 nd holding member 92 b.

Due to the elastic force of the elastic body 93 sandwiched between the 1 st bearing 91a and the 2 nd bearing 91b, it is easy to assemble the 1 st bearing structure 91 with the 1 st bearing 91a pressed only to the 1 st holding member 92a and the 2 nd bearing 91b pressed only to the 2 nd holding member 92 b. Therefore, the 1 st bearing structure 91 can be assembled in a simple process.

(4-3)

As shown in fig. 6, the 1 st bearing structure 91 has a 2 nd holding member 92b having a bearing inner peripheral surface 95 which surrounds the 1 st bearing 91a, the 2 nd bearing 91b, and the elastic member 93 and is in contact with the 2 nd bearing 91 b. The circumferential length in the radial direction of the bearing inner circumferential surface 95 at least partially increases from the 2 nd bearing 91b side (right side) to the 1 st bearing 91a side (left side) in the axial direction. Specifically, the bearing inner circumferential surface 95 includes an inclined portion 95b having an inner diameter gradually increasing from the right side to the left side. The 1 st bearing 91a, the 2 nd bearing 91b, and the elastic member 93 are located within the range occupied by the inclined portion 95b in the axial direction.

Therefore, when the 1 st bearing structure 91 is assembled, the 2 nd holding member 92b has a shape that facilitates insertion of the 1 st bearing 91a, the 2 nd bearing 91b, and the elastic body 93 inside the bearing inner peripheral surface 95. Therefore, the 1 st bearing structure 91 can be assembled in a simple process.

(4-4)

In the 1 st bearing structure 91, the 2 nd holding member 92b is a part of the stator cover 83b and is made of resin. In the 1 st drive shaft 22c supported by the 1 st bearing structure 91, the load of the plumes 22e of the cross flow fan 22 is directed radially downward. However, the 2 nd holding member 92b is formed of a lightweight material that is not easily deformed by a load. The 1 st holding member 92a is made of metal.

Therefore, the 1 st bearing structure 91 can suppress deformation of the 1 st holding member 92a and the 2 nd holding member 92b caused by receiving the radial load of the 1 st transmission shaft 22c, as compared with the case where the 1 st holding member 92a and the 2 nd holding member 92b that support the 1 st bearing 91a and the 2 nd bearing 91b, respectively, are elastic bodies such as rubber. Therefore, the 1 st bearing structure 91 can suppress the failure that the rotation axis a1 of the cross flow fan 22 equivalent to the axial center of the 1 st transmission shaft 22c gradually moves downward with time.

(4-5)

In the 1 st bearing structure 91, the 1 st bearing 91a and the 2 nd bearing 91b are pressed against the 1 st holding member 92a and the 2 nd holding member 92b, respectively, by the elastic force of the elastic body 93. The 1 st holding member 92a is made of metal and is press-fitted into the 2 nd holding member 92 b. Therefore, the 1 st bearing structure 91 can firmly fix the 1 st holding member 92a to the 2 nd holding member 92b at the time of assembly. Therefore, it is possible to suppress the occurrence of a failure in which the 1 st holding member 92a is detached from the 2 nd holding member 92b by the elastic force of the elastic body 93, and the 1 st bearing 91a and the 2 nd bearing 91b are not normally held by the 1 st holding member 92a and the 2 nd holding member 92b, respectively. Therefore, the 1 st bearing structure 91 can be expected to extend the service life of the bearing.

(4-6)

In the 1 st bearing structure 91, the 1 st bearing 91a and the 2 nd bearing 91b are self-aligning slide shafts. Therefore, even if the contact portion between the 1 st bearing 91a and the 1 st holding member 92a and the contact portion between the 2 nd bearing 91b and the 2 nd holding member 92b are radially displaced due to the tolerance of the radial dimension of the 1 st bearing 91a, the 2 nd bearing 91b, the 1 st holding member 92a, and the 2 nd holding member 92b, the tolerance of the radial dimension can be relaxed by the self-aligning action of the 1 st bearing 91a and the 2 nd bearing 91 b. Therefore, the 1 st bearing structure 91 can be expected to extend the service life of the bearing.

(4-7)

In the 1 st bearing structure 91, the elastic body 93 that presses the 1 st bearing 91a toward the 1 st holding member 92a and presses the 2 nd bearing 91b toward the 2 nd holding member 92b is a coil spring that expands and contracts in the axial direction.

Therefore, even if the dimensional tolerances in the axial direction of the 1 st bearing 91a, the 2 nd bearing 91b, the 1 st holding member 92a, and the 2 nd holding member 92b are accumulated, the 1 st holding member 92a and the 2 nd holding member 92b do not receive a large load from the 1 st bearing 91a and the 2 nd bearing 91b, respectively, due to the expansion and contraction of the elastic body 93 in the axial direction, and therefore the 1 st bearing 91a and the 2 nd bearing 91b can be held. This can alleviate the dimensional tolerance of the axial member. Therefore, the 1 st bearing structure 91 can be expected to extend the service life of the bearing.

(4-8)

In the 1 st bearing structure 91, the 1 st bearing 91a and the 2 nd bearing 91b are pressed against the 1 st holding member 92a and the 2 nd holding member 92b, respectively, by receiving a force of the coil spring, i.e., the elastic body 93, extending in the axial direction. That is, the 1 st bearing 91a and the 2 nd bearing 91b are held by the elastic force of the elastic body 93. Therefore, as shown in fig. 7, when the 1 st bearing structure 91 is assembled, the 1 st bearing structure 91 can be easily assembled by inserting the 2 nd holding member 92b of the stator cover 83b into the internal space of the 2 nd holding member 92b in the order of the 2 nd bearing 91b, the elastic body 93, and the 1 st bearing 91a, and then fixing the 1 st holding member 92a to the 2 nd holding member 92 b. Therefore, the 1 st bearing structure 91 can be assembled in a simple process.

(5) Variant examples

Examples of variations to which embodiments of the present invention can be applied are described below.

(5-1) variant example A

The 1 st bearing structure 91 of the embodiment, wherein the 2 nd holding member 92b holding the 2 nd bearing 91b is a part of the stator cover 83b of the stator 83. That is, the 1 st bearing structure 91 is integrated with the stator 83. However, the 1 st bearing structure 91 may be a unit detachable from the stator 83. That is, the 2 nd holding member 92b may not be a part of the stator cover 83b, and may be a resin member that is fixed to the stator cover 83b, for example. In this case, the 1 st bearing structure 91 is a unit that can be independent of the stator 83, and therefore, maintenance of the 1 st bearing structure 91 is facilitated.

(5-2) variant example B

The 1 st bearing structure 91 of the embodiment, as shown in fig. 8, wherein the 1 st length L1 is shorter than the 2 nd length L2, and the 1 st length L1 is shorter than the 3 rd length L3. However, the 1 st length L1 may be as short as possible or may be zero.

The shorter the 1 st length L1 is, the less strict the radial position of the elastic body 93 needs to be controlled when the elastic body 93 is inserted inside the 2 nd holding member 92 b. In particular, when the 1 st length L1 is zero, the step of radially positioning the elastic body 93 when the elastic body 93 is inserted inside the 2 nd holding member 92b is not required at all. Therefore, when designing the shapes of the 2 nd holding member 92b and the elastic body 93, the 1 st length L1 is set to zero, so that the process required for managing the position of the elastic body 93 can be omitted, and the assembly process of the 1 st bearing structure 91 can be simplified.

(5-3) variant example C

In the 1 st bearing structure 91 of the embodiment, the 2 nd holding member 92b is made of resin. However, the 2 nd holding member 92b may be formed of a material other than resin as long as it can suppress deformation of the 2 nd holding member 92b due to a radial load from the 1 st drive shaft 22 c. However, in the embodiment, the 2 nd holding member 92b is a part of the stator cover 83b made of resin, and when the 2 nd holding member 92b made of metal is used, for example, as shown in the modification a, it is necessary to separate the 2 nd holding member 92b from the stator 83 as a unit.

(5-4) variant example D

In the 1 st bearing structure 91 of the embodiment, the elastic body 93 is a coil spring, and as shown in fig. 8, the 1 st length L1, which is the radial distance between the outermost portion 93b of the elastic body 93 and the bearing inner peripheral surface 95 of the 2 nd holding member 92b, is shorter than the 2 nd length L2 and the 3 rd length L3. In the embodiment, as shown in fig. 6, the diameter of the elastic body 93 is larger at the center in the axial direction than at both ends in the axial direction. Therefore, the outermost portion 93b of the elastic body 93 is located on the outer periphery of the elastic body 93 in the axial central portion.

However, the elastic body 93 may have a shape different from that shown in fig. 6 and 8. Fig. 9 is a sectional view similar to fig. 6, and is a close-up view of the 1 st bearing structure 91 of the present modified example. Fig. 9 is different from fig. 6 only in the shape of the elastic body 93. As shown in fig. 9, the elastic body 93 has a larger diameter at both axial ends than at the axial center. Therefore, as shown in fig. 9, the outermost portion 93b of the elastic body 93 is located on the outer periphery of the elastic body 93 at both axial end portions. At this time, the 1 st length L1 is shorter than the 2 nd length L2 and the 3 rd length L3, and therefore, the process required for the position management of the elastic body 93 can be omitted, and the number of assembly steps of the 1 st bearing structure 91 can be reduced.

The elastic body 93 may be a member other than a coil spring as long as it is a member that can expand and contract in the axial direction.

(5-5) variant example E

In the 1 st bearing structure 91 according to the embodiment, the bearing inner peripheral surface 95 of the 2 nd holding member 92b is composed of a bearing holding portion 95a, an inclined portion 95b, and a stepped portion 95 c. The 1 st bearing 91a, the 2 nd bearing 91b, and the elastic body 93 are located inside the inclined portion 95 b. The inclined portion 95b gradually increases in inner diameter of the bearing inner circumferential surface 95 from the right side to the left side. That is, in fig. 6, the inclined portion 95b is inclined with respect to the rotation axis a1 of the cross flow fan 22.

However, the inclined portion 95b may be parallel to the rotation axis a1 of the cross flow fan 22. In this case, if the 1 st length L1 is shorter than the 2 nd length L2 and the 3 rd length L3, the steps required for the position management of the elastic body 93 can be omitted, and the number of assembly steps of the 1 st bearing structure 91 can be reduced.

Further, the inclined portion 95b may have a portion parallel to the rotation axis a1 and a portion whose inner diameter is gradually increased in going from the right side to the left side. That is, at least a part of the inclined portion 95b in the axial direction may have an inner diameter gradually increasing from the right side to the left side of the bearing inner circumferential surface 95.

(5-6) variant example F

The 1 st bearing structure 91 of the embodiment belongs to a bearing structure supporting the 1 st transmission shaft 22c of the cross flow fan 22. As shown in fig. 5, the 2 nd transmission shaft 22d of the cross flow fan 22 is rotatably supported by the 2 nd bearing structure 99. The 2 nd bearing structure 99 may be the same as the 1 st bearing structure 91. That is, the 2 nd bearing structure 99 may have the same components as the 1 st bearing 91a, the 2 nd bearing 91b, the 1 st holding member 92a, the 2 nd holding member 92b, and the elastic body 93 of the 1 st bearing structure 91.

Possibility of industrial application

The utility model discloses a bearing structure of motor can restrain when assembling, can be used to possess this bearing structure's motor to and possess the indoor set of the air conditioner of this motor.

Description of the symbols:

21 indoor heat exchanger (Heat exchanger)

22 Cross flow fan (Fan)

22c 1 st drive shaft (drive shaft)

81 indoor fan motor (Motor)

82 rotor

83 stator

91 st 1 bearing structure (bearing structure of motor)

91a 1 st bearing (Bearings)

91b 2 nd bearing (Bearings)

92a 1 st holding member (bearing holding member)

92b 2 nd holding member (bearing holding member)

93 elastic body

93a innermost part

93b outermost part

95 bearing inner peripheral surface (inner peripheral surface)

102 indoor machine (indoor machine of air conditioner)

L1 length 1

L2 length 2

L3 length 3

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2011-89533

Claims

1. A bearing structure (91) of a motor, which supports a transmission shaft (22c), is provided with: a plurality of bearings (91a, 91b) arranged in an axial direction of the drive shaft and rotatably supporting the drive shaft; a bearing holding member (92a, 92b) that holds the bearing; and an elastic body (93) sandwiched between the bearings axially adjacent to the shaft and surrounded by the bearing holding member and pressing the bearing toward the bearing holding member, the elastic body having an innermost portion (93a) nearest to the drive shaft in a radial direction of the drive shaft and an outermost portion (93b) nearest to the bearing holding member in the radial direction, the radial distance between the outermost portion and the bearing holding member being a1 st length (L1) shorter than the radial distance between the outermost portion and the drive shaft being a 2 nd length (L2), the 1 st length being shorter than the radial distance between the innermost portion and the drive shaft being a 3 rd length (L3).

2. The bearing structure of a motor according to claim 1, said bearings being composed of a1 st bearing (91a) and a 2 nd bearing (91b), said bearing holding member being composed of a1 st holding member (92a) which holds only said 1 st bearing, and a 2 nd holding member (92b) which holds only said 2 nd bearing.

3. The bearing structure of an electric motor according to claim 2, wherein said 2 nd holding member has an inner peripheral surface (95) surrounding surfaces of said 1 st bearing, said 2 nd bearing and said elastic body, i.e., contacting said 2 nd bearing, and said radial circumferential length of said inner peripheral surface increases at least partially in said axial direction from said 2 nd bearing side to said 1 st bearing side.

4. The bearing structure of an electric motor according to claim 3, wherein said 2 nd holding member is made of resin.

5. The bearing structure of an electric motor according to claim 4, wherein said 1 st holding member is made of metal and is press-fitted into said 2 nd holding member.

6. The bearing structure of an electric motor according to any one of claims 1 to 5, wherein the 1 st length is zero.

7. The bearing structure of an electric motor according to any one of claims 1 to 5, wherein the bearing is a self-aligning slide shaft.

8. The bearing structure of an electric motor according to any one of claims 1 to 5, wherein said elastic body is a coil spring that expands and contracts in said axial direction.

9. The bearing structure of an electric motor according to claim 8, wherein said bearing is pressed against said bearing holding member by receiving a force of said coil spring extending in said axial direction.

10. A motor (81) is provided with a stator (83); and a rotor (82) rotatably supported relative to the stator; and a drive shaft (22c) fixed to the rotor, the drive shaft being supported by a bearing structure (91) of the motor according to any one of claims 1 to 5.

11. An indoor unit (102) of an air conditioner is provided with a heat exchanger (21); a fan (22) for passing indoor air through the heat exchanger and discharging the air to the indoor; and a motor (81) for driving the fan, the motor being the motor of claim 10.