CN109586514B - Motor and motor unit - Google Patents
Motor and motor unit Download PDFInfo
- Publication number
- CN109586514B CN109586514B CN201810907173.XA CN201810907173A CN109586514B CN 109586514 B CN109586514 B CN 109586514B CN 201810907173 A CN201810907173 A CN 201810907173A CN 109586514 B CN109586514 B CN 109586514B
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- Prior art keywords
- peripheral surface
- motor
- cylindrical
- cylindrical portion
- inner peripheral
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
Abstract
The invention provides a motor and a motor unit. The motor includes: a rotor having a shaft disposed along a central axis extending in a vertical direction and rotating around the central axis; a stator facing the rotor with a gap in a radial direction; a casing having a cylindrical portion surrounding the stator from a radially outer side; and a cover member positioned above the stator and covering the opening on the upper side of the cylindrical portion. The cover member has a cylindrical cover barrel portion. The lid cylinder portion has: a first portion in which an external device is embedded in an inner peripheral surface; and a second portion embedded in the inner peripheral surface of the case at the outer peripheral surface. The first portion and the second portion are arranged to be offset in the axial direction.
Description
Technical Field
The invention relates to a motor and a motor unit.
Background
Japanese laid-open patent publication No. 2012 and 90496 discloses a structure in which a housing main body of a motor is fixed by fitting. On the other hand, an electromechanically integrated motor unit in which a control unit is mounted on a motor has been developed.
As an electromechanical motor, a motor having a cylindrical housing and a cover member covering an opening of the housing is known. In such a motor, it is conceivable to provide a tube portion (cover tube portion) in the cover member, and to fit the outer peripheral surface of the tube portion to the inner peripheral surface of the housing, and to fit the control device to the inner peripheral surface of the tube portion, thereby configuring the motor unit. In the case of this structure, both the inner and outer surfaces in the radial direction of the cylindrical portion of the lid member are fitting surfaces. Therefore, dimensional accuracy required for fitting is required for both the inner and outer surfaces. In general, when a cylindrical portion is formed by press working, it is difficult to complete both inner and outer surfaces in the radial direction with high precision. Therefore, the lid member having the above-described structure cannot be press-worked with high mass productivity, and there is a problem that the manufacturing cost of the lid member is increased.
Disclosure of Invention
In view of the above, it is an object of one aspect of the present invention to provide a motor including a cover member that has a cover cylindrical portion in which an inner peripheral surface and an outer peripheral surface are fitted and that can be formed by press working.
One embodiment of the motor of the present invention includes: a rotor having a shaft disposed along a central axis extending in a vertical direction, the rotor being rotatable about the central axis; a stator facing the rotor with a gap in a radial direction; a casing having a cylindrical portion surrounding the stator from a radial outer side; and a cover member that is positioned above the stator and covers an opening on the upper side of the cylindrical portion. The cover member has a cylindrical cover barrel portion. The lid cylinder part is provided with: a first portion in which an external device is embedded in an inner peripheral surface; and a second portion embedded in an inner circumferential surface of the case at an outer circumferential surface. The first portion and the second portion are arranged to be offset in the axial direction.
According to one aspect of the present invention, when the bearing holder is assembled to the housing in the motor, if fitting involving deformation such as interference fit including press fitting is employed, the influence on the fitting of the other can be suppressed. Further, the motor unit can improve the positional accuracy of the bearing holder with respect to the radial direction of the housing and the positional accuracy of the control device with respect to the radial direction of the bearing holder.
The above and other features, elements, steps, features and advantages of the present invention will be more clearly understood from the following detailed description of preferred embodiments of the present invention with reference to the accompanying drawings.
Drawings
Fig. 1 is a sectional view of a motor unit according to an embodiment.
Fig. 2 is an enlarged view of region II-II of fig. 1.
Fig. 3 is a partially enlarged view of a bearing holder (cover member) and a housing in modification 1.
Fig. 4 is a partially enlarged view of a bearing holder (cover member) and a housing according to modification 2.
Fig. 5 is a sectional view of the motor unit in which the sensor magnet is attached to the shaft.
Detailed Description
Hereinafter, a motor and a motor unit according to an embodiment will be described with reference to the drawings. In the following drawings, in order to facilitate understanding of each structure, the actual structure may be different from the scale, the number, and the like of each structure.
The Z axis is shown in the figures as appropriate. The Z-axis direction in each drawing is assumed to be a direction parallel to the axial direction of the central axis J shown in fig. 1. In the following description, the positive side (+ Z side) in the Z-axis direction is referred to as "upper side", and the negative side (-Z side) in the Z-axis direction is referred to as "lower side". The upper side and the lower side are directions for explanation only, and do not limit actual positional relationship and directions. Note that, unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply referred to as "axial direction" or "vertical direction", a radial direction about the central axis J is simply referred to as "radial direction", and a circumferential direction about the central axis J, that is, a direction of an axis around the central axis J is simply referred to as "circumferential direction". In the following description, the term "plan view" refers to a state viewed from the axial direction.
[ Motor Unit ]
Fig. 1 is a sectional view of a motor unit 3 of the present embodiment.
The motor unit 3 includes a motor 1, a control device (external device) 4, and a fixing bolt 5. The motor 1 and the control device 4 are fixed to each other by a fixing bolt 5. The motor 1 has a connection terminal (not shown) connected to the control device 4. The control device 4 supplies power to the motor 1 via a control terminal and controls rotation of the motor 1.
[ control device (external device) ]
The control device 4 has a base portion 4a and a projection portion 4 b.
The base portion 4a has a circular shape centered on the central axis J when viewed from the axial direction. The base portion 4a has a lower surface 4e that overlaps with the flange portions 19 and 45 provided on the motor 1 when viewed in the axial direction. Screw holes 4f aligned in the circumferential direction are provided in a lower surface 4e of the base portion 4 a. A fixing bolt 5 is inserted into the screw hole 4 f. Thereby, the control device is fixed to the flange portions 19, 45 of the motor 1.
The projecting portion 4b projects downward from the lower surface of the base portion 4 a. The convex portion 4b has a cylindrical shape centered on the central axis J. The projection 4b is accommodated inside the housing 40 of the motor 1. The convex portion 4b has a fitting outer peripheral surface 4c facing the circumferential outer side.
[ Motor ]
The motor 1 includes: the bearing device includes a rotor 20 having a shaft 21, a stator 30, a housing 40, an upper bearing (bearing) 6, a lower bearing 7, and a bearing holder (cover member) 10.
[ rotor ]
The rotor 20 rotates about the center axis J. The rotor 20 includes a shaft 21, a rotor core 24, and a rotor magnet 23. The shaft 21 is disposed along a central axis J extending in the vertical direction (axial direction) around the central axis J. The shaft 21 is supported by the lower bearing 7 and the upper bearing 6 so as to be rotatable about the axis of the central axis J.
The rotor core 24 is fixed to the shaft 21. The rotor core 24 circumferentially surrounds the shaft 21. The rotor magnet 23 is fixed to the rotor core 24. The rotor core 24 and the rotor magnet 23 rotate together with the shaft 21.
[ stator ]
The stator 30 is opposed to the rotor 20 with a gap therebetween in the radial direction, and surrounds the rotor 20 on the radially outer side. The stator 30 includes a stator core 31, an insulator 32, and a coil 33. The insulating member 32 is made of an insulating material. The insulator 32 covers at least a portion of the stator core 31. The coil 33 is formed by winding a coil wire (not shown).
[ Upper and lower bearings ]
The upper bearing 6 rotatably supports the upper end of the shaft 21. The upper bearing 6 is located on the upper side of the stator 30. The upper bearing 6 is held by a bearing holder 10.
The lower bearing 7 rotatably supports the lower end portion of the shaft 21. The lower bearing 7 is located at the lower side of the stator 30. The lower bearing 7 is held by a lower bearing holding portion 48 of the housing 40.
[ case ]
The housing 40 has a cylindrical shape opened to the upper side (+ Z side). The housing 40 accommodates the rotor 20 and the stator 30. The housing 40 has a cylindrical portion 44, a flange portion 45, a bottom portion 43, and a lower bearing holding portion 48.
The cylindrical portion 44 surrounds the stator 30 from the radially outer side. The cylindrical portion 44 has a first cylindrical portion 44a, a tapered cylindrical portion 44b, and a second cylindrical portion 44 c. The first cylindrical portion 44a, the tapered cylindrical portion 44b, and the second cylindrical portion 44c are arranged in this order from the upper side to the lower side. The first cylindrical portion 44a, the tapered cylindrical portion 44b, and the second cylindrical portion 44c are axially connected to each other with substantially the same plate thickness.
The first cylindrical portion 44a is located at an upper end portion of the cylindrical portion 44. The first cylindrical portion 44a is a cylinder centered on the central axis J. A flange 45 is connected to an upper end of the first cylindrical portion 44 a.
The second cylindrical portion 44c is located below the first cylindrical portion 44 a. The second cylindrical portion 44c is a cylinder centered on the central axis J. The inner diameter of the second cylindrical portion 44c is smaller than the inner diameter of the first cylindrical portion 44 a. The stator 30 is fixed to the inner circumferential surface of the second cylindrical portion 44 c. The bearing holder 10 is fitted to the inner circumferential surface of the second cylindrical portion 44 c.
The tapered cylindrical portion 44b is axially located between the first cylindrical portion 44a and the second cylindrical portion 44c, and connects the first cylindrical portion 44a and the second cylindrical portion 44 c. The tapered tube portion 44b is inclined radially inward from the upper side toward the lower side.
The flange 45 is located at the upper end of the cylindrical portion 44. The flange 45 extends radially outward from the opening of the cylindrical portion 44. The flange portion 45 is provided with a first fixing hole 45a into which the fixing bolt 5 is inserted.
The bottom portion 43 is located at the lower end of the cylindrical portion 44. The bottom 43 is located on the lower side of the stator 30. The bottom portion 43 covers the opening on the lower side of the cylindrical portion 44.
The lower bearing holding portion 48 is located at the center of the bottom portion 43 in plan view. The lower bearing holding portion 48 holds the lower bearing 7. The lower bearing holding portion 48 includes: a retainer tube portion 48a extending in the axial direction about the center axis J; and a lower end projecting portion 48b extending radially inward from the lower end of the retainer tube portion 48 a. A hole 48c is provided in the center of the lower end projection 48b in plan view, and the hole 48c penetrates in the axial direction and allows the lower end portion of the shaft 21 to pass therethrough.
[ bearing holder (cover Member) ]
The bearing holder 10 is located at an upper side of the stator 30. The bearing holder 10 is fixed to an opening on the upper side of the cylindrical portion 44 of the housing 40. The bearing holder 10 covers the opening of the cylindrical portion 44 of the housing 40. The bearing holder 10 supports the upper bearing 6. The shape of the bearing holder 10 in plan view (XY view) is, for example, a circular shape concentric with the central axis J.
The bearing cage 10 is made of metal. The bearing holder 10 is formed by press working a plate material made of metal.
The bearing holder 10 includes an upper bearing holding portion (bearing holding portion) 11, a first flat portion 12, an inclined portion 13, a second flat portion 14, a cover cylindrical portion 18, and a flange portion 19. The upper bearing holding portion 11, the first flat portion 12, the inclined portion 13, the second flat portion 14, the lid cylindrical portion 18, and the flange portion 19 are arranged in this order from the radially inner side to the radially outer side.
The upper bearing holding portion 11 holds the upper bearing 6. The upper bearing holding portion 11 is located at the center of the bearing holder 10 in a plan view. The upper bearing holding portion 11 includes: a retainer tube portion 11a extending in the axial direction with the center axis J as the center; and a lower end projecting portion 11b extending radially inward from the lower end of the retainer tube portion 11 a. The lower end projection 11b positions the upper bearing 6 in the vertical direction. A hole 11c penetrating in the axial direction is provided at the center of the lower end protrusion 11b in a plan view. The hole 11c allows the shaft 21 to pass through.
The first flat portion 12 extends radially outward from the upper end of the retainer cylindrical portion 11a of the upper bearing retainer 11. The first flat portion 12 extends along a plane perpendicular to the center axis J.
The inclined portion 13 extends radially outward from the outer edge of the first flat portion 12. The inclined portion 13 is inclined downward as it goes outward in the radial direction.
The second flat portion 14 extends radially outward from the outer edge of the inclined portion 13. The second flat portion 14 extends along a plane perpendicular to the center axis J.
The flange portion 19 is located on the outer edge of the bearing holder 10 and extends radially outward from the upper end of the cover cylinder portion 18. The flange portion 19 of the bearing holder 10 is located above the flange portion 45 of the housing 40. That is, the flange portion 19 and the flange portion 45 overlap in the axial direction. The lower surface of the flange portion 19 of the bearing holder 10 contacts the upper surface of the flange portion 45 of the housing 40. The flange portion 19 is provided with a second fixing hole 19a into which the fixing bolt 5 is inserted.
The lid cylinder portion 18 is cylindrical with the center axis J as the center. The lid cylinder portion 18 is opposed to the cylinder portion 44 in the radial direction. The cap portion 18 is connected at a lower end to the second flat portion 14. The lid cylindrical portion 18 is connected at an upper end to the flange portion 19.
Fig. 2 is an enlarged view of region II-II of fig. 1.
The skirt portion 18 has a first portion 15, an intermediate portion 16, and a second portion 17. The first portion 15, the intermediate portion 16, and the second portion 17 are arranged in this order from the upper side to the lower side. The first portion 15, the intermediate portion 16, and the second portion 17 are connected in the axial direction with substantially the same plate thickness.
The first portion 15 is located at an upper end of the skirt portion 18. The first portion 15 is a cylinder centered on the central axis J. The first portion 15 has a first inner peripheral surface (inner peripheral surface) 15a facing radially inward and a first outer peripheral surface (outer peripheral surface) 15b facing radially outward.
The first inner circumferential surface 15a surrounds the control device 4 from the radially outer side. The first inner peripheral surface 15a is fitted to the fitting outer peripheral surface 4c of the control device 4. That is, the cover cylindrical portion 18 is fitted to the control device 4 on the inner peripheral surface (first inner peripheral surface 15a) of the first portion 15. The lower end surface 4d of the control device 4 is located above the lower end of the first portion 15.
The first outer peripheral surface 15b is located radially inward of the first cylindrical portion 44a of the housing 40. The first outer peripheral surface 15b is opposed to an inner peripheral surface 44aa of the first cylindrical portion 44a facing radially inward with a gap therebetween in the radial direction.
In the present specification, "fitting" or "fitting" between the members means that at least a part of circumferential directions of the inner circumferential surface and the outer circumferential surface of the members are in contact with each other, and one of the members is positioned in the radial direction of the other member. The "fitting" described in this specification may be a clearance fit, an interference fit, or a transition fit.
In the present embodiment, the first portion 15 is formed by press drawing with the first inner peripheral surface 15a as a dimensional reference. Therefore, the dimensional accuracy of the first inner peripheral surface 15a of the first portion 15 is higher than that of the first outer peripheral surface 15 b. By using the first inner peripheral surface 15a as a dimensional standard at the time of molding for fitting with the control device 4, the position accuracy of the control device 4 in the radial direction with respect to the bearing holder 10 can be improved.
The second portion 17 is located at the lower end of the skirt portion 18. The second portion 17 is a cylinder centered on the central axis J. The inner diameter D17 of second portion 17 is smaller than the inner diameter D15 of first portion 15.
The second portion 17 has a second inner peripheral surface (inner peripheral surface) 17a facing the radially inner side and a second outer peripheral surface (outer peripheral surface) 17b facing the radially outer side.
The second outer circumferential surface 17b is surrounded by a second cylindrical portion 44c of the housing 40 from the radially outer side. The second outer circumferential surface 17b is fitted to an inner circumferential surface 44ca facing radially inward of the second cylindrical portion 44 c. That is, the lid cylinder portion 18 is fitted to a part of the inner peripheral surface of the housing (more specifically, the inner peripheral surface 44ca of the second cylindrical portion 44 c) at the outer peripheral surface (the second outer peripheral surface 17b) of the second portion 17.
In the present embodiment, the second portion 17 is formed by press drawing with the second outer peripheral surface 17b as a dimensional reference. Therefore, the dimensional accuracy of the second outer circumferential surface 17b of the second portion 17 is higher than the dimensional accuracy of the second inner circumferential surface 17 a. By using the second outer circumferential surface 17b as a dimensional standard at the time of molding for fitting with the inner circumferential surface 44ca of the housing 40, the positional accuracy of the bearing holder 10 in the radial direction with respect to the housing 40 can be improved.
The intermediate portion 16 is located axially between the first portion 15 and the second portion 17, connecting the first portion 15 and the second portion 17. The intermediate portion 16 is inclined radially inward from the upper side toward the lower side.
The intermediate portion 16 has an intermediate inner peripheral surface 16a facing radially inward and an intermediate outer peripheral surface 16b facing radially outward. The intermediate outer peripheral surface 16b is opposed to an inner peripheral surface 44ba facing radially inward of the tapered cylindrical portion 44b of the housing 40 with a gap therebetween in the radial direction.
According to the present embodiment, the first portion 15 fitted in the control device 4 at the first inner peripheral surface 15a and the second portion 17 fitted in the inner peripheral surface 44ca of the housing 40 at the second outer peripheral surface 17b are arranged offset in the axial direction. Thus, the fitting surfaces of the first portion 15 and the second portion 17 can be displaced in the axial direction, and the respective fitting surfaces can be formed with high accuracy by performing press drawing in separate steps. As a result, the positional accuracy of the bearing holder 10 in the radial direction with respect to the housing 40 and the positional accuracy of the control device 4 in the radial direction with respect to the bearing holder 10 can be improved.
According to the present embodiment, since the first portion 15 and the second portion 17 are arranged to be offset in the axial direction, when fitting involving deformation such as interference fit including press fitting is adopted as the fitting of the first portion 15 and the second portion 17, it is possible to suppress influence of the fitting of either one of the inner peripheral surface (the first inner peripheral surface 15a) and the outer peripheral surface (the second outer peripheral surface 17b) of the lid tube portion 18 on the fitting of the other.
According to the present embodiment, the bearing holder 10 has the flange portion 19 extending radially outward from the upper end of the first portion 15. The cover portion 18 is formed by press working to form the first portion 15, the intermediate portion 16, and the second portion 17 in this order. Therefore, in the processing steps of the intermediate portion 16 and the second portion 17 after the first portion 15 is molded, the first portion 15 may be deformed. By providing the flange portion 19 at the upper end of the first portion 15, the rigidity of the first portion 15 can be improved. This can suppress the first portion 15 from being deformed by the stress at the time of machining the intermediate portion 16 and the second portion 17, and as a result, the dimensional accuracy of the first portion 15 can be improved.
In the present embodiment, a case where the first portion 15 of the embedded controller 4 is located above the second portion 17 embedded in the housing 40 is described. However, as shown in modification 1 (see fig. 3) described later, the second portion 117 fitted into the housing 40 may be located above the first portion 115 in which the control device 4 is fitted. In this case, by providing the flange portion 19 extending radially outward from the upper end of the second portion 117, the rigidity of the second portion 117 is increased, and the second portion 117 can be prevented from being deformed by stress generated when the first portion 115 is machined.
That is, the bearing holder 10 may have a flange portion 19 extending radially outward from one of the first portion 15 and the second portion 17 located on the upper side. This increases the rigidity of the upper one of the first portion 15 and the second portion 17, and suppresses deformation due to stress when the other is machined.
According to this embodiment, the inner diameter D15 of the first portion 15 and the inner diameter D17 of the second portion 17 are different from each other, the first portion 15 and the second portion 17 being connected by means of the intermediate portion 16. The intermediate portion 16 extends in an axial direction in a tapered manner, and therefore has high rigidity. Therefore, even when one of the first portion 15 and the second portion 17 is deformed during fitting, the influence on the other side can be suppressed.
In this embodiment, the inner diameter D15 of first portion 15 is larger than the inner diameter D17 of second portion 17. The first portion 15 is located above the second portion 17. By disposing the larger inner diameter one of the first portion 15 and the second portion 17 on the upper side, the lid cylinder portion 18 can be easily molded by press working.
In the present embodiment, the inner diameter D15 of the first section 15 in which the control device 4 is fitted is larger than the inner diameter D17 of the second section 17. With the configuration of the present embodiment, even when the diameter of the convex portion 4b of the control device 4 is large, the convex portion 4b can be accommodated in the housing 40.
(modification 1)
Fig. 3 is a partial sectional view showing a bearing holder 110 and a housing 140 of modification 1 that can be employed in the above-described embodiment. The same reference numerals are given to the same constituent elements as those of the above-described embodiment, and the description thereof will be omitted.
The housing 140 of the present modification includes a cylindrical portion 144, a flange portion 45 having the same configuration as that of the above-described embodiment, a bottom portion 43, and a lower bearing holding portion 48 (see fig. 1).
The cylindrical portion 144 of the present modification is a cylinder extending in the axial direction. The cylindrical portion 144 extends in the axial direction with the same inner diameter. A flange 45 is connected to an upper end of the cylindrical portion 144. The cylindrical portion 144 has an inner peripheral surface 144a facing radially inward.
The bearing holder 110 of the present modification includes a cap portion 118, a flange portion 19 having the same configuration as that of the above-described embodiment, an upper bearing holding portion 11, a first flat portion 12, an inclined portion 13, a second flat portion 14, and a flange portion 19 (see fig. 1).
The lid cylindrical portion 118 of the present modification is cylindrical with the center axis J as the center. The cap portion 118 is connected at a lower end to the second flat portion 14. The lid cylindrical portion 118 is connected to the flange portion 19 at the upper end.
The skirt portion 118 has a second portion 117, an intermediate portion 116, and a first portion 115. The second portion 117, the intermediate portion 116, and the first portion 115 are arranged in this order from the upper side to the lower side. The second portion 117, the intermediate portion 116, and the first portion 115 are connected in the axial direction with substantially the same plate thickness.
The second portion 117 is located at the upper end of the skirt portion 118. The second portion 117 is a cylinder centered on the central axis J. The second portion 117 has a second inner peripheral surface (inner peripheral surface) 117a facing the radially inner side and a second outer peripheral surface (outer peripheral surface) 117b facing the radially outer side.
The second inner circumferential surface 117a surrounds the control device 4 from the radially outer side. The second inner peripheral surface 117a is opposed to the fitting outer peripheral surface 4c of the control device 4 with a gap in the radial direction.
The second outer circumferential surface 117b is surrounded by the cylindrical portion 144 of the housing 140 from the radially outer side. The second outer peripheral surface 117b is fitted to the inner peripheral surface 144a of the cylindrical portion 144. That is, the lid cylinder portion 118 is fitted into the inner peripheral surface 144a of the housing 140 at the outer peripheral surface (second outer peripheral surface 117b) of the second portion 117.
In the present modification, the second portion 117 is formed by press drawing with the second outer peripheral surface 117b as a dimensional reference. Therefore, the dimensional accuracy of the second outer circumferential surface 117b of the second portion 117 is higher than the dimensional accuracy of the second inner circumferential surface 117 a. By using the second outer circumferential surface 117b as a dimensional standard at the time of molding for fitting with the inner circumferential surface 144a of the housing 140, the positional accuracy of the bearing holder 110 in the radial direction with respect to the housing 140 can be improved.
The first portion 115 is located at a lower end of the skirt portion 118. The first portion 115 is a cylinder centered on the central axis J. The inner diameter D115 of the first portion 115 is smaller than the inner diameter D117 of the second portion 117. The first portion 115 has a first inner peripheral surface (inner peripheral surface) 115a facing radially inward and a first outer peripheral surface (outer peripheral surface) 115b facing radially outward.
The first inner circumferential surface 115a surrounds the control device 4 from the radially outer side. The first inner peripheral surface 115a is fitted to the fitting outer peripheral surface 4c of the control device 4. That is, the cap barrel portion 118 is fitted into the control device 4 on the inner peripheral surface (first inner peripheral surface 115a) of the first portion 115.
The first outer peripheral surface 115b is located radially inward of the cylindrical portion 144 of the housing 140. The first outer peripheral surface 115b faces the inner peripheral surface 144a of the cylindrical portion 144 with a gap therebetween in the radial direction.
In the present modification, the first portion 115 is formed by press drawing with the first inner peripheral surface 115a as a dimensional reference. Therefore, the dimensional accuracy of the first inner peripheral surface 115a of the first portion 115 is higher than the dimensional accuracy of the first outer peripheral surface 115 b. By using the first inner circumferential surface 115a as a dimensional standard at the time of molding for fitting with the control device 4, the position accuracy of the control device 4 in the radial direction with respect to the bearing holder 110 can be improved.
The intermediate portion 116 is located axially between the first portion 115 and the second portion 117, connecting the first portion 115 and the second portion 117. The intermediate portion 116 is inclined radially inward from the upper side toward the lower side. That is, the intermediate portion 116 extends conically in the axial direction.
The intermediate portion 116 has an intermediate inner peripheral surface 116a facing radially inward and an intermediate outer peripheral surface 116b facing radially outward. The intermediate inner peripheral surface 116a is opposed to the fitting outer peripheral surface 4c of the control device 4 with a gap in the radial direction. The intermediate outer peripheral surface 116b faces the inner peripheral surface 144a of the cylindrical portion 144 of the housing 140 with a gap therebetween in the radial direction.
According to the present modification, the first portion 115 fitted in the control device 4 at the first inner peripheral surface 115a and the second portion 117 fitted in the inner peripheral surface 144a of the housing 140 at the second outer peripheral surface 117b are arranged offset in the axial direction. This can provide the same effects as those of the above-described embodiment. That is, the fitting surfaces of the first portion 115 and the second portion 117 can be displaced in the axial direction, and the respective fitting surfaces can be formed with high accuracy by performing press drawing in separate steps. Further, it is possible to suppress the fitting of either one of the first portion 115 and the second portion 117 from affecting the fitting of the other.
In the present modification, the inner diameter D117 of the second portion 117 is larger than the inner diameter D115 of the first portion 115. The second portion 117 is located above the first portion 115. That is, in the present modification, the first portion 115 in which the control device 4 is embedded is located below the second portion 117. With the configuration of the present modification, when the axial length of the protruding portion 4b of the control device 4 is large, the protruding portion 4b can be efficiently accommodated in the housing 140.
(modification 2)
Fig. 4 is a partial sectional view showing a bearing holder 210 and a housing 240 according to modification 2 that can be employed in the above-described embodiment. The same reference numerals are given to the same constituent elements as those of the above-described embodiment, and the description thereof will be omitted.
The housing 240 of the present modification includes a cylindrical portion 244, a flange portion 45 having the same configuration as that of the above-described embodiment, a bottom portion 43, and a lower bearing holding portion 48 (see fig. 1).
The cylindrical portion 244 of the present modification includes a cylindrical portion 244b and a tapered cylindrical portion 244a located above the cylindrical portion 244 b. A boundary 244c between the cylindrical portion 244b and the tapered cylindrical portion 244a is located below the lower end of the fitting outer circumferential surface 4c of the control device 4. That is, the upper end of the cylindrical portion 244b is located below the lower end of the fitting outer circumferential surface 4c of the control device 4.
The cylindrical portion 244b has a cylindrical shape centered on the central axis J. The cylindrical portion 244b has an inner circumferential surface 244ba facing radially inward.
The tapered cylindrical portion 244a is located between the cylindrical portion 244b and the flange portion 45. The tapered tube portion 244a has an inner diameter that increases from the lower side toward the upper side. The tapered cylinder portion 244a can also be smoothly curved.
The bearing holder 210 of the present modification includes a cap portion 218, a flange portion 19 having the same configuration as that of the above-described embodiment, an upper bearing holding portion 11, a first flat portion 12, an inclined portion 13, a second flat portion 14, and a flange portion 19 (see fig. 1).
The cover cylindrical portion 218 of the present modification is a cylinder centered on the central axis J. The cap portion 218 is connected to the second flat portion 14 at the lower end. The lid cylindrical portion 218 is connected to the flange portion 19 at the upper end.
The skirt portion 218 has a first portion 215 and a second portion 217. The first portion 215 and the second portion 217 are arranged in this order from the upper side to the lower side. A boundary 218a between the first portion 215 and the second portion 217 is located between a lower end of the fitting outer peripheral surface 4c of the control device 4 and a boundary 244c between the cylindrical portion 244b and the tapered cylindrical portion 244a of the housing 240 in the up-down direction.
The first portion 215 and the second portion 217 are connected to each other in the axial direction with substantially the same plate thickness. First portion 215 and second portion 217 have substantially the same inner and outer diameters. In addition, the inner and outer diameters of first portion 215 are not strictly consistent with the inner and outer diameters of second portion 217. As will be described later, the first portion 215 and the second portion 217 are different in the surface of the dimensional standard in the manufacturing process. Therefore, the inner diameter and the outer diameter of the first portion 215 are slightly different from those of the second portion 217.
The first portion 215 has a first inner peripheral surface (inner peripheral surface) 215a facing the radially inner side and a first outer peripheral surface (outer peripheral surface) 215b facing the radially outer side. The first inner peripheral surface 215a is fitted to the fitting outer peripheral surface 4c of the control device 4. The first outer peripheral surface 215b faces the tapered cylindrical portion 244a of the housing 240 with a gap therebetween in the radial direction.
In the present modification, the first portion 215 is formed by press drawing with the first inner peripheral surface 215a as a dimensional reference. Therefore, the dimensional accuracy of the first inner peripheral surface 215a of the first portion 215 is higher than the dimensional accuracy of the first outer peripheral surface 215 b. By using the first inner circumferential surface 215a as a dimensional standard at the time of molding for fitting with the control device 4, the position accuracy of the control device 4 in the radial direction with respect to the bearing holder 210 can be improved. In the present embodiment, as shown in fig. 5, the motor unit 3 includes: a sensor magnet 181 attached to the shaft 21; and a detector 182 that detects the rotational position of the sensor magnet 181. The sensor magnet 181 and the detector 182 are located below the control device 4. The detector 182 is opposed to the sensor magnet 181 in the radial direction. The detector 182 is mounted to the bottom 43 of the housing 40. For example, the sensor magnet 181 is an annular magnet, and the magnetic poles thereof are sequentially changed in the circumferential direction. The detector 182 detects a change in the magnetic pole of the sensor magnet 181 with rotation of the shaft 21. The detector 182 has an output terminal (not shown) that outputs the detected rotational position information to the control device 4. According to this configuration, since the positional accuracy of the bearing holder 10 in the radial direction with respect to the housing 40 is improved, the positional accuracy in the radial direction between the detector 182 attached to the bottom portion 43 of the housing 40 and the sensor magnet 181 is also improved as a result. As a result, variations in the position detection accuracy of the detector 182 due to manufacturing variations of the motor unit 3 can be reduced. Therefore, the rotation control of the motor unit is easily and stably performed.
The second portion 217 has a second inner peripheral surface (inner peripheral surface) 217a facing the radially inner side and a second outer peripheral surface (outer peripheral surface) 217b facing the radially outer side. The second outer circumferential surface 217b is fitted to an inner circumferential surface 244ba of the cylindrical portion 244b of the housing 240.
According to the present modification, the first portion 215 fitted to the control device 4 at the first inner peripheral surface 215a and the second portion 217 fitted to the inner peripheral surface 244ba of the cylindrical portion 244b of the housing 240 at the second outer peripheral surface 217b are arranged to be offset in the axial direction. This can provide the same effects as those of the above-described embodiment. That is, the fitting surfaces of the first portion 215 and the second portion 217 can be displaced in the axial direction, and the respective fitting surfaces can be formed with high accuracy by performing press drawing in separate steps. Further, it is possible to suppress the influence of the fitting of one of the first portion 215 and the second portion 217 on the fitting of the other.
Although the embodiment and the modification of the present invention have been described above, the configurations and combinations thereof in the embodiment and the modification are examples, and additions, omissions, substitutions, and other modifications of the configurations can be made without departing from the spirit of the present invention. The present invention is not limited by the embodiments.
A motor according to an exemplary embodiment of the present invention includes: a rotor having a shaft disposed along a central axis extending in a vertical direction, the rotor being rotatable about the central axis; a stator facing the rotor with a gap in a radial direction; a housing having a cylindrical portion surrounding the stator from the outside in the radial direction; and a cover member that is positioned above the stator and covers an opening on the upper side of the cylindrical portion, the cover member having a cylindrical cover cylinder portion, the cover cylinder portion having a first portion that fits an external device on an inner peripheral surface and a second portion that fits an inner peripheral surface of the housing on an outer peripheral surface, the first portion and the second portion being arranged offset in an axial direction.
In the motor according to the exemplary embodiment of the present invention, the lid member includes a flange portion extending radially outward from an upper end of one of the first portion and the second portion located on an upper side.
In the motor according to an exemplary embodiment of the present invention, the inner diameter of the first portion and the inner diameter of the second portion are different from each other, and the first portion and the second portion are connected by an intermediate portion extending in a tapered manner in the axial direction.
In the motor according to the exemplary embodiment of the present invention, the first portion is located above the second portion, and the inner diameter of the first portion is larger than the inner diameter of the second portion.
In the motor according to the exemplary embodiment of the present invention, the second portion is located above the first portion, and the inner diameter of the second portion is larger than the inner diameter of the first portion.
In the motor according to the exemplary embodiment of the present invention, the shaft is rotatably supported by the bearing, and the cover member is a bearing holder that supports the bearing.
A motor unit according to an exemplary embodiment of the present invention includes the motor and a control device as an external device, and the control device controls rotation of the motor.
Claims (9)
1. A motor, comprising:
a rotor having a shaft disposed along a central axis extending in a vertical direction, the rotor being rotatable about the central axis;
a stator facing the rotor with a gap in a radial direction;
a casing having a cylindrical portion surrounding the stator from a radial outer side; and
a cover member positioned above the stator and covering an opening on the upper side of the cylindrical portion,
the cover member has a bearing holding portion, a cylindrical cover cylindrical portion, and a flange portion,
the cover member is a bearing holder formed by press working a sheet material,
the bearing holding portion, the cap cylinder portion, and the flange portion are arranged in this order from the radially inner side to the radially outer side,
the lid cylinder part is provided with:
a first part which can be fitted with an external device on the inner peripheral surface and is formed by press-drawing with the inner peripheral surface as a dimensional standard;
a second portion having an outer peripheral surface fitted into the inner peripheral surface of the housing and formed by press-drawing with the outer peripheral surface as a dimensional reference; and
an intermediate portion axially between the first portion and the second portion,
the first portion and the second portion are arranged to be offset in the axial direction,
the first portion, the intermediate portion, and the second portion are connected to each other in the axial direction with substantially the same plate thickness.
2. The motor of claim 1,
the flange portion extends radially outward from an upper end of one of the first portion and the second portion located on an upper side.
3. The motor according to claim 1 or 2,
the inner diameter of the first portion and the inner diameter of the second portion are different from each other,
the first part is connected to the second part by an intermediate part which extends conically in the axial direction.
4. The motor according to claim 1 or 2,
the first portion is located at an upper side than the second portion,
the first portion has an inner diameter greater than an inner diameter of the second portion.
5. The motor according to claim 1 or 2,
the second portion is located at an upper side than the first portion,
the second portion has an inner diameter greater than an inner diameter of the first portion.
6. The motor according to claim 1 or 2,
the motor includes a bearing that supports the shaft to be rotatable.
7. The motor according to claim 1 or 2,
the cover member further has a first flat portion, an inclined portion, and a second flat portion,
the bearing holding portion, the first flat portion, the inclined portion, the second flat portion, the cap cylinder portion, and the flange portion are arranged in this order from the radially inner side to the radially outer side.
8. The motor according to claim 1 or 2,
the first portion has a first inner peripheral surface facing radially inward and a first outer peripheral surface facing radially outward,
the cylindrical portion has a first cylindrical portion, a tapered cylindrical portion, and a second cylindrical portion,
the first outer circumferential surface is opposed to an inner circumferential surface of the first cylindrical portion facing radially inward with a gap interposed therebetween.
9. A motor unit, comprising:
the motor of any one of claims 1 to 8; and
as a control means for the external device,
the control device controls rotation of the motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-191286 | 2017-09-29 | ||
| JP2017191286A JP2019068603A (en) | 2017-09-29 | 2017-09-29 | Motor and motor unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109586514A CN109586514A (en) | 2019-04-05 |
| CN109586514B true CN109586514B (en) | 2021-08-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810907173.XA Active CN109586514B (en) | 2017-09-29 | 2018-08-10 | Motor and motor unit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2019068603A (en) |
| CN (1) | CN109586514B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05292697A (en) * | 1992-04-08 | 1993-11-05 | Matsushita Electric Ind Co Ltd | Dc motor |
| JP2012090496A (en) * | 2010-10-22 | 2012-05-10 | Jtekt Corp | Motor and electrically driven power steering device |
| CN102763309A (en) * | 2010-03-19 | 2012-10-31 | 三菱电机株式会社 | Electric drive device and electric power steering device having same mounted therein |
| CN105827032A (en) * | 2015-01-26 | 2016-08-03 | 株式会社电装 | Rotating electrical machine |
| WO2016151816A1 (en) * | 2015-03-25 | 2016-09-29 | 三菱電機株式会社 | Electric motor and ventilation fan |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6179476B2 (en) * | 2014-07-31 | 2017-08-16 | 株式会社デンソー | DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE USING THE SAME |
| KR102355646B1 (en) * | 2015-06-04 | 2022-01-27 | 엘지이노텍 주식회사 | Motor |
-
2017
- 2017-09-29 JP JP2017191286A patent/JP2019068603A/en not_active Ceased
-
2018
- 2018-08-10 CN CN201810907173.XA patent/CN109586514B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05292697A (en) * | 1992-04-08 | 1993-11-05 | Matsushita Electric Ind Co Ltd | Dc motor |
| CN102763309A (en) * | 2010-03-19 | 2012-10-31 | 三菱电机株式会社 | Electric drive device and electric power steering device having same mounted therein |
| JP2012090496A (en) * | 2010-10-22 | 2012-05-10 | Jtekt Corp | Motor and electrically driven power steering device |
| CN105827032A (en) * | 2015-01-26 | 2016-08-03 | 株式会社电装 | Rotating electrical machine |
| WO2016151816A1 (en) * | 2015-03-25 | 2016-09-29 | 三菱電機株式会社 | Electric motor and ventilation fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109586514A (en) | 2019-04-05 |
| JP2019068603A (en) | 2019-04-25 |
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