CN210744852U - Motor with a stator having a stator core - Google Patents
Motor with a stator having a stator core Download PDFInfo
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- CN210744852U CN210744852U CN201921713964.5U CN201921713964U CN210744852U CN 210744852 U CN210744852 U CN 210744852U CN 201921713964 U CN201921713964 U CN 201921713964U CN 210744852 U CN210744852 U CN 210744852U
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Abstract
A motor is provided, which can easily process the shaft of a rotor even if the shaft is formed in a hollow cylinder shape, and avoid the deterioration of production efficiency. The utility model discloses a motor includes stator and rotor, and this rotor has the axle, and can with the axle be the center pin for the stator is rotatory, wherein, the axle is the cavity tube-shape, the axle is formed by the first axial region and the second axial region equipment of cutting apart formation in the extending direction of this axle is the axial promptly.
Description
Technical Field
The utility model relates to a motor.
Background
A motor generally includes a stator having an iron core and a coil wound around the iron core, and a rotor having a shaft and a magnet provided on the shaft and rotatable with respect to the stator about the shaft as a center axis.
Conventionally, in a rotor, a shaft is generally formed by cutting an integral member, but in practice, a mounting portion of the shaft to which another member is mounted may have a complicated structure, and for example, the shaft may be required to be formed in a hollow cylindrical shape to mount another member inside the shaft.
SUMMERY OF THE UTILITY MODEL
The present invention has been made in view of the above problems, and an object of the present invention is to provide a motor which can easily process a shaft of a rotor even if the shaft is formed in a hollow cylindrical shape, thereby preventing the deterioration of the production efficiency.
In order to achieve the above object, the present invention provides a motor including a stator and a rotor, wherein the rotor has a hollow cylindrical shaft, and can rotate relative to the stator with the shaft as a central axis, wherein the shaft is assembled by a first shaft portion and a second shaft portion which are formed by being divided in an extending direction of the shaft, i.e., an axial direction.
According to the utility model discloses a motor, the axle is the cavity tube-shape, therefore, is difficult to the inner peripheral surface of counter shaft and processes, and this kind of problem can become more obvious when the length of axle increases, nevertheless, through set up the axle to be formed by the first axial region and the second axial region of cutting apart the formation in the extending direction of this axle is the axial and assemble, can show the processing of the inner peripheral surface of simplifying the axle to avoid production efficiency to worsen.
In the motor of the present invention, it is preferable that: a first bearing that rotatably supports the first shaft portion from an outer peripheral side of the first shaft portion; a second bearing that rotatably supports the second shaft portion from an outer peripheral side thereof; and a magnet that is provided on an outer peripheral side of the first shaft portion closer to the first bearing than the second bearing in the axial direction, the first shaft portion and the second shaft portion being divided in the axial direction at a position between the magnet and the second bearing.
According to the utility model discloses a motor, first axial region also plays as the yoke portion of rotor magnet, therefore, through setting up the position of cutting apart of first axial region and second axial region between magnet and second bearing, can avoid or restrain the effect as yoke portion of first axial region and receive the influence.
In the motor of the present invention, it is preferable that the first shaft portion and the second shaft portion are fixed together by welding.
According to the utility model discloses a motor, first axial region and second axial region pass through the welding and fix together, consequently, can firmly fix first axial region and second axial region to increase the holistic intensity of axle.
In the motor of the present invention, it is preferable that the circumferential surface of the first shaft portion and the circumferential surface of the second shaft portion are fixed to each other by welding over the entire circumference.
According to the utility model discloses a motor, the first axial region is global and the global of second axial region is fixed together through the welding on the whole week, consequently, can more firmly fix first axial region and second axial region to further increase the holistic intensity of axle.
In the motor of the present invention, it is preferable that: a first bearing that rotatably supports the first shaft portion from an outer peripheral side of the first shaft portion; and a second bearing that rotatably supports the second shaft portion from an outer peripheral side of the second shaft portion, an axial positioning portion being provided on the second shaft portion, the second bearing and the first shaft portion abutting against the axial positioning portion from both sides in the axial direction.
According to the motor of the utility model, the axial positioning part is arranged on the second shaft part, and the second bearing and the first shaft part are abutted against the axial positioning part from two sides in the axial direction, so that the first shaft part and the second shaft part can be conveniently positioned in the axial direction, and the shaft and the second bearing can be conveniently positioned in the axial direction; further, by positioning the second bearing in the axial direction by the axial positioning portion provided in the second shaft portion, the load applied to the welded portion can be suppressed as compared with the case where the second bearing is positioned in the axial direction by the end surface of the first shaft portion.
In the motor of the present invention, it is preferable that the axial direction coincides with the vertical direction, the first shaft portion is located above the second shaft portion, the axial positioning portion includes a flange portion and a cylindrical portion, the flange portion extends from the second shaft portion toward the outer peripheral side, an upper end surface of the flange portion is abutted by the first shaft portion, a lower end surface of the flange portion is abutted by the second bearing, the cylindrical portion extends upward from the flange portion, an outer peripheral surface of the first shaft portion is abutted by an inner peripheral surface of the cylindrical portion, and an upper end of the cylindrical portion and the first shaft portion are fixed together by laser welding; alternatively, an inner peripheral surface of the first shaft portion abuts against an outer peripheral surface of the cylindrical portion, and an upper end of the flange portion and the first shaft portion are fixed together by laser welding.
According to the motor of the present invention, the upper end surface of the flange portion is abutted by the first shaft portion, and the lower end surface of the flange portion is abutted by the second bearing, so that the positioning of the first shaft portion and the second shaft portion in the axial direction and the positioning of the shaft and the second bearing in the axial direction can be realized with a simple structure; further, since the outer peripheral surface of the first shaft portion abuts against the inner peripheral surface of the cylindrical portion, or the inner peripheral surface of the first shaft portion abuts against the outer peripheral surface of the cylindrical portion, the first shaft portion and the second shaft portion can be positioned in the radial direction about the center axis of the shaft with a simple configuration; further, since the upper end of the cylindrical portion or the flange portion and the first shaft portion are laser-welded, the first shaft portion and the second shaft portion can be easily fixed together.
In the motor of the present invention, it is preferable that the axial direction coincides with the vertical direction, the first shaft portion is located above the second shaft portion, the axial positioning portion includes a flange portion and a cylindrical portion, the flange portion extends from the second shaft portion toward an outer peripheral side, a lower end surface of the flange portion is abutted by the second bearing, the cylindrical portion extends upward from the flange portion, an end portion of the first shaft portion on a side close to the second shaft portion has a stepped portion, an outer peripheral surface of the stepped portion abuts against an inner peripheral surface of the cylindrical portion, a lower end surface of the stepped portion abuts against an upper end surface of the cylindrical portion, and an upper end portion of the cylindrical portion and the first shaft portion are fixed together by laser welding; alternatively, an inner peripheral surface of the stepped portion abuts against an outer peripheral surface of the cylindrical portion, a lower end surface of the stepped portion abuts against an upper end surface of the cylindrical portion, and a lower end of the first shaft portion is laser welded to an upper side of the cylindrical portion than the lower end of the cylindrical portion.
According to the motor of the present invention, the lower end surface of the step portion abuts against the upper end surface of the cylindrical portion, and the lower end surface of the flange portion abuts against the second bearing, so that the first shaft portion and the second shaft portion can be positioned in the axial direction and the shaft and the second bearing can be positioned in the axial direction with a simple structure; further, since the outer peripheral surface of the stepped portion abuts against the inner peripheral surface of the cylindrical portion, or the inner peripheral surface of the stepped portion abuts against the outer peripheral surface of the cylindrical portion, the first shaft portion and the second shaft portion can be positioned in the radial direction about the central axis of the shaft with a simple configuration.
In the motor of the present invention, it is preferable that the second shaft portion has an end surface portion extending toward the central axis of the shaft perpendicularly to the axial direction, and the end surface portion has a through hole penetrating the end surface portion in the axial direction.
According to the utility model discloses a motor, second shaft portion has the terminal surface portion that extends towards the central axis of axle perpendicularly with the axial, and terminal surface portion has the perforating hole that runs through terminal surface portion along the axial, consequently, can conveniently utilize the screw etc. that passes the perforating hole to be fixed in the inside of axle with the output shaft of other equipment.
In the motor of the present invention, it is preferable that the portion of the end surface portion provided with the through hole is closer to the first shaft portion than an end portion of the second shaft portion which is away from the first shaft portion.
According to the motor of the present invention, the portion of the end surface portion where the through hole is provided is closer to the first shaft portion than the end portion of the second shaft portion which is away from the first shaft portion, and therefore, when the output shaft of another device is fixed to the inside of the shaft by a screw or the like, it is easy to avoid the head portion of the screw or the like from protruding from the second shaft portion in the direction away from the first shaft portion, and therefore, the increase in size of the motor in the axial direction can be suppressed.
In the motor of the present invention, it is preferable that the axial direction coincides with the vertical direction, the first shaft portion is located above the second shaft portion, the first shaft portion and the second shaft portion are made of iron, respectively, and the second shaft portion has a hardness greater than that of the first shaft portion by performing heat treatment.
According to the utility model discloses a motor, the axial is unanimous with the upper and lower direction, and first axial region leans on the top than second axial region, and consequently, the load that second axial region bore is big than the load that first axial region bore, nevertheless, second axial region has the hardness that is greater than first axial region through carrying out the heat treatment, consequently, can prolong the holistic life of axle to, compare with the condition that first axial region and second axial region all used the part of big hardness, help reducing manufacturing cost.
In the motor of the present invention, it is preferable that the motor has a housing for housing the stator and the rotor, the axial direction is aligned with the vertical direction, the first shaft portion is located above the second shaft portion, the housing has a bearing holding portion, the bearing holding portion has an inner peripheral surface abutting on the outer peripheral side of the second bearing and a support surface abutting on the lower side of the second bearing, an annular groove is provided in a position above the second bearing of the inner peripheral surface of the bearing holding portion, an annular member is installed in the annular groove, and the annular member abuts on the second bearing from the upper side.
According to the motor of the present invention, the housing has the bearing holding portion having the bearing surface abutting against the lower side of the second bearing, the annular groove is provided in the inner peripheral surface of the bearing holding portion at a position above the second bearing, and the annular member abutting against the second bearing from the upper side is mounted in the annular groove, so that the second bearing can be axially supported by the bearing surface of the bearing holding portion and the annular member; in particular, since the axial direction coincides with the vertical direction, the force with which the annular member presses the second bearing from above is small as compared with the force with which the bearing surface of the bearing holding portion supports the second bearing from below due to the action of gravity, and therefore, the annular member having a small strength can be used, which contributes to reduction in manufacturing cost.
In the motor of the present invention, it is preferable that the housing has: a bottom portion that expands from an outer peripheral edge of the bearing holding portion toward an outer peripheral side; and a main body portion that is cylindrical and extends upward from an outer peripheral edge of the bottom portion, wherein the annular groove is provided at a position on an upper surface side of the bottom portion in the axial direction.
According to the motor of the present invention, the annular groove is provided at a position on the upper surface side of the bottom portion, and therefore, it is easy to avoid the portion of the bearing holding portion that holds the second bearing from being a thin portion having a small thickness in the radial direction, that is, even if the housing is made with a fixed thickness, the annular groove for fixing the annular member can be provided on the bearing holding portion while ensuring the strength of the bearing holding portion.
(effects of utility model)
According to the present invention, the shaft is hollow, and therefore, the inner peripheral surface of the shaft is not easily processed, and this problem becomes more conspicuous when the length of the shaft is increased, but the processing of the inner peripheral surface of the shaft can be remarkably simplified by assembling the shaft into the first shaft portion and the second shaft portion which are formed by being divided in the extending direction of the shaft, i.e., the axial direction, thereby avoiding the deterioration of the production efficiency.
Drawings
Fig. 1 is a perspective view schematically showing a motor according to an embodiment of the present invention.
Fig. 2 is a sectional perspective view schematically showing a motor according to an embodiment of the present invention.
Fig. 3 is a partial side sectional view schematically showing a motor according to modification 1 of the present invention.
Fig. 4 is a partial side sectional view schematically showing a motor according to modification 2 of the present invention.
Fig. 5 is a partial side sectional view schematically showing a motor according to modification 3 of the present invention.
(symbol description)
100 motor
110 motor body
111 stator
1111 stator iron core
1112 coil
112 rotor
1121 shaft
11211 first shaft part
11212 second shaft part
1122 magnet
113 circuit board
1141 first bearing
1142 second bearing
115 sensor rotor
120 connector
121 terminal part
130 outer casing
131 shell main body
1311 bearing holding part
13111 inner peripheral surface
13112 bearing surface
1312 bottom part
1313 main body part
13131 small diameter portion
13132 middle diameter part
132 cover
140 connector holder
141 inner ring part
142 outer ring part
143 connecting part
144 block portion
BDP large diameter part
MDP middle diameter part
SDP1 first minor diameter portion
Second minor diameter portion of SDP2
AP, AP1, AP2, AP3 axial locating parts
FP, FP1, FP2, FP3 flange part
SP, SP1, SP2, SP3 tubular parts
RG annular groove
RM ring-shaped component
OP1 first opening
OP2 second opening
R1 first groove
R2 second groove
EP end face
TH through hole
PP2, PP3 steps
L central axis
Detailed Description
Next, a motor according to an embodiment of the present invention will be described with reference to fig. 1 and 2, where fig. 1 is a perspective view schematically showing the motor according to the embodiment of the present invention, and fig. 2 is a sectional perspective view schematically showing the motor according to the embodiment of the present invention.
Here, for convenience of explanation, three directions orthogonal to each other are set as an X direction, a Y direction, and a Z direction, and one side of the X direction is set as X1, the other side of the X direction is set as X2, one side of the Y direction is set as Y1, the other side of the Y direction is set as Y2, one side of the Z direction is set as Z1, the other side of the Z direction is set as Z2, and an extending direction of a central axis line of a rotor of a motor main body is set to coincide with the Z direction, the Z direction coincides with an up-down direction in the drawing, and the Z1 direction corresponds to an upper direction.
The definitions of the directions in the present specification are only for convenience of describing the embodiments of the present invention, and do not limit the directions of the motor and the like in use and manufacture.
(integral Structure of Motor)
As shown in fig. 1 and 2, the motor 100 is attached to an external device (not shown, for example, on the Z1 direction side of the motor 100). The motor 100 includes a stator 111 and a rotor 112, the rotor 112 has a hollow cylindrical shaft 1121, is rotatable with respect to the stator 111 about the shaft 1121 as a central axis, and is assembled by a first shaft portion 11211 and a second shaft portion 11212 formed by dividing the shaft 1121 in an axial direction which is an extending direction of the shaft 1121.
Here, the motor 100 includes a motor main body 110 and a connector 120, wherein the motor main body 110 includes a stator 111, a rotor 112 rotatable about a central axis L with respect to the stator 111, and a circuit board 113 electrically connected to the stator 111, and the connector 120 protrudes radially outward with respect to the motor main body 110 with respect to the central axis L and has a terminal portion 121 electrically connecting the circuit board 113 with an external device. The motor 100 includes a housing 130, and the housing 130 includes a housing main body 131 and a cover 132 that are integrally formed, in which the housing main body 131 is formed in a cylindrical shape extending along the central axis L and open to at least one side in the extending direction of the central axis L, and houses the motor main body 110, and the cover 132 protrudes from the housing main body 131 to the outside in the radial direction and opens in the direction perpendicular to the central axis L, and houses the connector 120. In addition, a connector holder 140 is accommodated in the housing 130, and the connector holder 140 supports the connector 120.
(Structure of stator)
As shown in fig. 1 and 2, the stator 111 includes a stator core 1111 and a coil 1112. Stator core 1111 has a ring shape and a plurality of pole teeth (not shown), and an outer peripheral surface of stator core 1111 contacts an inner peripheral surface of case main body 131, and one end surface (i.e., a lower end surface in the drawing) of stator core 1111 contacts a step surface provided on the inner peripheral surface of case main body 131. The coil 1112 is wound around the pole teeth of the stator core 1111 with an insulator interposed therebetween.
(Structure of rotor)
As shown in fig. 1 and 2, the rotor 112 has a shaft 1121. The shaft 1121 is formed in a hollow cylindrical shape extending along the central axis L, and is rotatably supported at both end sides in the extending direction of the central axis L by a first bearing 1141 and a second bearing 1142, respectively, and a magnet 1122 is provided so as to face the tip of the pole tooth of the stator core 1111 in a substantially middle region in the extending direction of the central axis L. Specifically, the shaft 1121 is assembled by a first shaft portion 11211 and a second shaft portion 11212 formed by dividing in the axial direction, which is the extending direction of the shaft 1121, wherein the first shaft portion 11211 is formed in a hollow cylindrical shape, a first bearing 1141 for supporting the first shaft portion 11211 to be rotatable from the outer peripheral side of the first shaft portion 11211 and a substantially annular sensor rotor 115 for supporting the first shaft portion 11211 in the Z1 direction side from the outer peripheral side of the first bearing 1141 are provided on the outer peripheral surface of the first shaft portion 11211 in the Z2 direction side than the first bearing 1141, a magnet 1122 is provided on the outer peripheral surface of the first shaft portion 11211 in the Z1 direction side (i.e., on the first bearing 1141 side) from the second bearing 1142 in the extending direction of the central axis L, the second shaft portion 11212 is formed in a hollow cylindrical shape on the outer peripheral side of the first shaft portion 11211 in the Z2 direction, and a second bearing 1142 for supporting the second shaft portion 11212 to be rotatable from the outer peripheral side of the second shaft portion 11212 is provided, an inner peripheral surface of the second shaft portion 11212 and a portion of an outer peripheral surface of the first shaft portion 11211 in the extending direction of the central axis L are fixed together by welding. More specifically, in the extending direction of the shaft 1121, i.e., in the axial direction, the first shaft portion 11211 and the second shaft portion 11212 are divided at a position between the magnet 1122 and the second bearing 1142; the first shaft 11211 is made of iron, and includes a large diameter portion BDP, a middle diameter portion MDP closer to the Z1 direction side than the large diameter portion BDP and having an outer diameter smaller than the large diameter portion BDP, a first small diameter portion SDP1 closer to the Z1 direction side than the middle diameter portion MDP and having an outer diameter smaller than the middle diameter portion MDP, and a second small diameter portion SDP2 closer to the Z2 direction side than the large diameter portion BDP and having an outer diameter smaller than the middle diameter portion MDP, a magnet 1122 is provided on the outer circumferential surface of the large diameter portion BDP, and a step surface is formed between the middle diameter portion MDP and the first small diameter portion SDP1, and the step surface abuts against the inner ring of the first bearing 1141 as the rolling bearing from the Z2 direction side of the first bearing 1141; the second shaft portion 11212 is made of iron and has a hardness greater than that of the first shaft portion 11211 by heat treatment, an end portion of the second shaft portion 11212 on the first shaft portion 11211 side (i.e., an upper end portion in the drawing) is provided with an axial positioning portion AP with which the second bearing 1142 and the first shaft portion 11211 abut from both sides in the extending direction of the center axis L, the axial positioning portion AP includes a flange portion FP extending from the second shaft portion 11212 toward an outer peripheral side (i.e., a radially outer side) centered on the center axis L, one end surface (i.e., an upper end surface in the drawing) of the flange portion FP in the extending direction of the center axis L against which the first shaft portion 11211 abuts, the other end surface (i.e., a lower end surface in the drawing) of the flange portion FP in the extending direction of the center axis L against which the inner ring of the second bearing 1142 of the rolling bearing abuts, and a cylindrical portion SP extending from an outer peripheral edge of the flange, the outer peripheral surface of the first shaft 11211 abuts against the inner peripheral surface of the cylindrical portion SP, and the end portion (i.e., the upper end in the drawing) of the cylindrical portion SP on the Z1 direction side is fixed to the first shaft 11211 by laser welding over the entire circumference; the second shaft portion 11212 has an end surface portion EP extending perpendicular to the axial direction toward the central axis L of the shaft 1121, the end surface portion EP has a through hole TH penetrating the end surface portion EP in the axial direction, the portion of the end surface portion EP where the through hole TH is provided is closer to the first shaft portion 11211 than the end portion of the second shaft portion 11212 away from the first shaft portion 11211, and the output shaft of another device not shown can be fixed to the shaft 1121 by inserting the output shaft into the shaft 1121 from the Z1 direction side and screwing a screw or the like not shown into the end portion of the output shaft from the Z2 direction side through the through hole TH.
(Structure of housing)
As shown in fig. 1 and 2, the circuit board 113 is accommodated in the housing 130, the circuit board 113 is disposed on one side (the Z1 direction side, the upper side in the drawing) of the housing 130 in the extending direction of the central axis L, the housing 130 has a first opening OP1 on one side in the extending direction of the central axis L, and the first opening OP1 is formed in a size allowing the circuit board 113 to enter and exit the housing 130.
Specifically, the circuit board 113 is provided on one side of the case main body 131 in the extending direction of the central axis L such that the thickness direction of the circuit board 113 coincides with the extending direction of the central axis L. The case body 131 has a case body side first opening on one side in the extending direction of the central axis L, and the cover 132 has a cover side first opening on one side in the extending direction of the central axis L, the cover side first opening and the case body side first opening communicating and constituting a first opening OP1 together. The connector 120 falls within the range of the first opening OP1, and the connector holder 140 and the circuit board 113 also fall within the range of the first opening OP1, as viewed in the extending direction of the central axis L. An annular first groove R1 in which a seal member (not shown) such as a seal ring is disposed is formed in the peripheral edge of the first opening OP 1. The cover 132 has a second opening OP2 at its radially outer end, and an annular second groove R2 in which a seal member (not shown) such as a seal ring is disposed is formed at the periphery of the second opening OP 2. The first groove R1 at least partially overlaps the second groove R2 as viewed in the extending direction of the central axis L.
Further, as shown in fig. 1 and 2, in the housing 130, the housing main body 131 has a bearing holding portion 1311, a bottom portion 1312, and a main body portion 1313. The bearing holding portion 1311 is in the shape of a tube extending along the center axis L, and holds the second bearing 1142; the bottom portion 1312 spreads from the outer peripheral edge of the bearing holder 1311 toward the outer peripheral side; the body 1311 has a cylindrical shape extending along the center axis L, and extends from the outer peripheral edge of the bottom 1312 toward the Z1 direction (i.e., upward in the drawing). Specifically, the bearing holder 1311 has an inner peripheral surface 13111 that abuts on the outer peripheral side of the second bearing 1142 and a support surface 13112 that abuts on the Z2 direction side (i.e., the lower side in the drawing) of the second bearing 1142, an annular groove RG is provided at a position on the Z1 direction side of the inner peripheral surface 13111 of the bearing holder 1311 than the second bearing 1142 (in the illustrated example, the annular groove RG is provided at a position on the Z1 direction side surface side of the bottom portion 1312 in the axial direction, and the annular groove RG overlaps with the Z1 direction side surface of the bottom portion 1312 when viewed in the direction perpendicular to the axial direction), an annular member RM such as a metal washer is mounted in the annular groove RG, and the annular member RM abuts on the second bearing 1142 from the Z1 direction side of the second bearing 1142; the bottom portion 1312 extends from the outer peripheral edge of the portion of the bearing holder 1311 on the Z1 direction side toward the outer peripheral side; the main body portion 1313 has a small diameter portion 13131, an intermediate diameter portion 13132 on the Z1 direction side of the small diameter portion 13131, and a large diameter portion on the Z1 direction side of the intermediate diameter portion 13132, wherein the Z2 direction side of the small diameter portion 13131 is connected to the outer peripheral edge of the bottom portion 1312, the intermediate diameter portion 13132 has an inner diameter larger than the inner diameter of the small diameter portion 13131, the Z1 direction side is connected to the cover 132, a step surface is formed between the small diameter portion 13131 and the intermediate diameter portion 13132, the step surface abuts on the end surface of the stator core 1111 on the Z2 direction side from the Z2 direction side, the large diameter portion has an inner diameter larger than the inner diameter of the intermediate diameter portion 13132, the cover 132 is connected to the Z1 direction side, and a step surface is formed between the intermediate diameter portion 13132 and the large diameter portion, and the step surface abuts on the outer annular portion 142 of the connector holder 140, which will be described later, from the Z2 direction side of.
As shown in fig. 1 and 2, in the housing 130, the cover 132 is formed in a substantially rectangular parallelepiped box shape as a whole, and the cover 132 projects from the housing main body 131 toward the outer peripheral side (projects toward the X1 direction side in the illustrated example), and houses at least a part of the connector holder 140 (a block portion 144 described below in the illustrated example) and the connector 120.
(Structure of connector holder)
As shown in fig. 2, connector holder 140 covers a part of connector 120 so that terminal portions 121 of connector 120 are exposed, and housing 130 supports connector holder 140 from the Z2 direction side of connector holder 140. Specifically, the connector holder 140 is made of resin, and a radially outer end of the connector holder 140 is located radially outward of a radially outer end of the terminal portion 121 of the connector 120. The connector holder 140 includes an inner annular portion 141 that constitutes a bearing holding portion that holds the first bearing 1141, an outer annular portion 142 located on the outer peripheral side of the inner annular portion 141, a connecting portion 143 that connects the inner annular portion 141 and the outer annular portion 142 and is provided in plurality at intervals in the circumferential direction around the center axis L, and a block portion 144 that protrudes from the outer annular portion 142 toward the outer peripheral side (in the example shown in the drawing, toward the X1 side). Further, an elastic member (not shown, for example, a wave washer) is provided between the bearing holding portion 141 and the outer ring of the first bearing 1141 in the extending direction of the central axis L, the first bearing 1141 biases the connector holder 140 toward the Z2 direction side (i.e., downward in the drawing) via the elastic member, and the housing 130 abuts against the connector holder 140 from the Z2 direction side of the connector holder 140, thereby supporting the connector holder 140. More specifically, the case main body 131 of the housing 130 houses the stator 111, the rotor 112, the inner annular portion 141, and the outer annular portion 142, and the case main body 131 abuts against the outer annular portion 142 from the Z2 direction side of the outer annular portion 142.
(main effect of the present embodiment)
According to the motor 100 of the present invention, since the shaft 1121 has a hollow cylindrical shape, it is not easy to machine the inner peripheral surface of the shaft 1121, which becomes more obvious when the length of the shaft 1121 is increased, but by providing the shaft 1121 so as to be assembled from the first shaft portion 11211 and the second shaft portion 11212 that are formed by dividing in the axial direction, which is the extending direction of the shaft 1121, the machining of the inner peripheral surface of the shaft 1121 can be significantly simplified, thereby avoiding deterioration of the production efficiency.
The present invention has been described above by way of example with reference to the accompanying drawings, and it is to be understood that the specific implementations of the present invention are not limited to the above-described embodiments.
For example, in the above embodiment, the configuration shown in fig. 3 may also be adopted: the axial positioning portion AP1 includes a flange portion FP1 and a cylindrical portion SP1, the flange portion FP1 extends from the second shaft portion 11212 toward the outer peripheral side with the center axis L as the center, an end surface (an upper end surface in the drawing) on the Z1 direction side of the flange portion FP1 is abutted with the first shaft portion 11211, an end surface (a lower end surface in the drawing) on the Z2 direction side of the flange portion FP1 is abutted with the second bearing 1142, the cylindrical portion SP1 extends from the flange portion FP1 (specifically, an inner peripheral edge) toward the Z1 direction side, an inner peripheral surface of the first shaft portion 11211 is abutted with an outer peripheral surface of the cylindrical portion SP1, and an end portion on the Z1 direction side of the flange portion FP1 and the first shaft portion 11211 are fixed by laser welding over the.
In the above embodiment, the configuration shown in fig. 4 may be adopted: the axial positioning portion AP2 includes a flange portion FP2 and a cylindrical portion SP2, the flange portion FP2 extends from the second shaft portion 11212 toward the outer peripheral side centering on the central axis L, an end surface (a lower end surface in the drawing) on the Z2 direction side of the flange portion FP2 is abutted by the second bearing 1142, the cylindrical portion SP2 extends from the flange portion FP2 (specifically, an outer peripheral edge) toward the Z1 direction side, an end portion of the first shaft portion 11211 on the second shaft portion 11212 side has a PP stepped portion 2, the stepped portion PP2 is formed by removing a portion on the radially outer side of the lower end of the first shaft portion 11211, the stepped portion is in a "7" shape as viewed in a cross-sectional view along the central axis L, for example, fig. 4, an outer peripheral surface of the PP2 abuts against an inner peripheral surface of the cylindrical portion SP2, an end surface (a lower end surface in the Z2 direction side in the drawing) of the PP2 abuts against an end surface (an upper end surface in the Z1 direction (an upper end surface in the drawing) of the cylindrical portion SP 638 side in the cylindrical portion SP 638.
In the above embodiment, the configuration shown in fig. 5 may be adopted: the axial positioning portion AP3 includes a flange portion FP3 and a cylindrical portion SP3, the flange portion FP3 extends from the second shaft portion 11212 toward the outer peripheral side with the center axis L as the center, an end surface (a lower end surface in the drawing) on the Z2 direction side of the flange portion FP3 is abutted by the second bearing 1142, the cylindrical portion SP3 extends from the flange portion FP3 (specifically, an outer peripheral edge) toward the Z1 direction side, an end portion of the first shaft portion 11211 on the second shaft portion 11212 side has a PP stepped portion 3, the stepped portion PP3 is formed by removing a portion on the radially inner side of the lower end of the first shaft portion 11211, the stepped portion is in an inverted "L" shape as viewed in a cross-sectional view along the center axis, for example, in fig. 5, an inner peripheral surface of the PP stepped portion 3 is abutted against an outer peripheral surface of the cylindrical portion SP3, an end surface (a lower end surface in the Z2 direction side in the drawing) of the stepped portion PP3 is abutted against an end surface (an upper end surface in the Z1 direction in the drawing) of.
In the above embodiment, the extending direction of the central axis L corresponds to the actual vertical direction, but the present invention is not limited to this, and the motor 100 may be provided so that the extending direction of the central axis L coincides with the actual horizontal direction, for example, in some cases.
Further, in the above embodiment, the first shaft portion 11211 and the second shaft portion 11212 are fixed to each other by laser welding over the entire circumference in a part in the axial direction, but the present invention is not limited to this, and the specific welding method and welding portion may be appropriately selected as necessary.
It should be understood that the present invention can freely combine the respective components of the embodiments or appropriately change or omit the respective components of the embodiments within the scope thereof.
Claims (12)
1. A motor comprising a stator and a rotor, the rotor having a hollow cylindrical shaft and being rotatable relative to the stator about the shaft as a center axis,
the shaft is assembled by a first shaft portion and a second shaft portion that are formed by being divided in an axial direction, which is an extending direction of the shaft.
2. The motor of claim 1, comprising:
a first bearing that rotatably supports the first shaft portion from an outer peripheral side of the first shaft portion;
a second bearing that rotatably supports the second shaft portion from an outer peripheral side thereof; and
a magnet that is provided on an outer peripheral side of the first shaft portion, the magnet being closer to the first bearing than the second bearing in the axial direction,
the first shaft portion and the second shaft portion are divided at a position between the magnet and the second bearing in the axial direction.
3. The motor of claim 2,
the first shaft portion and the second shaft portion are fixed together by welding.
4. The motor according to any one of claims 1 to 3,
the circumferential surface of the first shaft portion and the circumferential surface of the second shaft portion are fixed together by welding over the entire circumference.
5. The motor of claim 4, comprising:
a first bearing that rotatably supports the first shaft portion from an outer peripheral side of the first shaft portion; and
a second bearing that rotatably supports the second shaft portion from an outer peripheral side thereof,
an axial positioning part is arranged on the second shaft part,
the second bearing and the first shaft portion abut against the axial positioning portion from both sides in the axial direction.
6. The motor of claim 5,
the axial direction is consistent with the up-down direction,
the first shaft portion is located above the second shaft portion,
the axial positioning portion includes a flange portion extending from the second shaft portion toward an outer peripheral side, an upper end surface of the flange portion being abutted by the first shaft portion, a lower end surface of the flange portion being abutted by the second bearing,
the cylindrical portion extends upward from the flange portion, an outer peripheral surface of the first shaft portion abuts against an inner peripheral surface of the cylindrical portion, and an upper end of the cylindrical portion and the first shaft portion are fixed together by laser welding; alternatively, an inner peripheral surface of the first shaft portion abuts against an outer peripheral surface of the cylindrical portion, and an upper end of the flange portion and the first shaft portion are fixed together by laser welding.
7. The motor of claim 5,
the axial direction is consistent with the up-down direction,
the first shaft portion is located above the second shaft portion,
the axial positioning portion includes a flange portion extending from the second shaft portion toward an outer peripheral side, a lower end surface of the flange portion against which the second bearing abuts, and a cylindrical portion extending upward from the flange portion,
the first shaft portion has a stepped portion at an end portion on the second shaft portion side,
an outer peripheral surface of the stepped portion abuts against an inner peripheral surface of the cylindrical portion, a lower end surface of the stepped portion abuts against an upper end surface of the cylindrical portion, and an upper end portion of the cylindrical portion and the first shaft portion are fixed together by laser welding; alternatively, an inner peripheral surface of the stepped portion abuts against an outer peripheral surface of the cylindrical portion, a lower end surface of the stepped portion abuts against an upper end surface of the cylindrical portion, and a lower end of the first shaft portion is laser welded to an upper side of the cylindrical portion than the lower end of the cylindrical portion.
8. The motor of claim 1,
the second shaft portion has a face portion extending toward a central axis of the shaft perpendicularly to the axial direction,
the end surface portion has a through hole penetrating the end surface portion in the axial direction.
9. The motor of claim 8,
the portion of the end surface portion where the through hole is provided is closer to the first shaft portion than an end portion of the second shaft portion that is farther from the first shaft portion.
10. The motor of claim 1,
the axial direction is consistent with the up-down direction,
the first shaft portion is located above the second shaft portion,
the first shaft portion and the second shaft portion are each made of iron,
the second shaft portion has a hardness greater than that of the first shaft portion by heat treatment.
11. The motor of claim 2,
the motor has a housing that houses the stator and the rotor,
the axial direction is consistent with the up-down direction,
the first shaft portion is located above the second shaft portion,
the housing has a bearing holding portion that holds a bearing,
the bearing holding portion has an inner peripheral surface abutting on an outer peripheral side of the second bearing and a support surface abutting on a lower side of the second bearing,
an annular groove is provided in the inner peripheral surface of the bearing holding portion above the second bearing, and an annular member is mounted in the annular groove and abuts against the second bearing from above.
12. The motor of claim 11,
the housing has:
a bottom portion that expands from an outer peripheral edge of the bearing holding portion toward an outer peripheral side; and
a main body part having a cylindrical shape and extending upward from an outer peripheral edge of the bottom part,
the annular groove is provided at a position on the upper surface side of the bottom portion in the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921713964.5U CN210744852U (en) | 2019-10-14 | 2019-10-14 | Motor with a stator having a stator core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921713964.5U CN210744852U (en) | 2019-10-14 | 2019-10-14 | Motor with a stator having a stator core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210744852U true CN210744852U (en) | 2020-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921713964.5U Active CN210744852U (en) | 2019-10-14 | 2019-10-14 | Motor with a stator having a stator core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210744852U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12027954B2 (en) | 2021-03-31 | 2024-07-02 | Nidec Corporation | Hollow shaft and method for manufacturing hollow shaft |
-
2019
- 2019-10-14 CN CN201921713964.5U patent/CN210744852U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12027954B2 (en) | 2021-03-31 | 2024-07-02 | Nidec Corporation | Hollow shaft and method for manufacturing hollow shaft |
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