WO2023084654A1 - モータ取付構造、モータユニット、及び車両用ステアリング装置 - Google Patents
モータ取付構造、モータユニット、及び車両用ステアリング装置 Download PDFInfo
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- WO2023084654A1 WO2023084654A1 PCT/JP2021/041417 JP2021041417W WO2023084654A1 WO 2023084654 A1 WO2023084654 A1 WO 2023084654A1 JP 2021041417 W JP2021041417 W JP 2021041417W WO 2023084654 A1 WO2023084654 A1 WO 2023084654A1
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- motor
- fastening
- housing
- stator
- motor case
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- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
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- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000002775 capsule Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
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- 230000002159 abnormal effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
Definitions
- the present invention relates to a motor mounting structure, a motor unit, and a vehicle steering device.
- an electric power steering device for a vehicle that generates a steering assist force by a motor is known.
- the applicant of the present application has proposed an electric power steering apparatus described in Patent Document 1, which has a structure for suppressing transmission of vibration generated by a motor to a housing as an attached body.
- a motor for an electric power steering device described in Patent Document 1 has a rotor and a stator, an output shaft that rotates together with the rotor, and a motor case that houses the rotor and stator.
- the motor case is attached to a housing that accommodates the worm reduction mechanism, and the output shaft of the motor is connected to the worm that is the input gear of the worm reduction mechanism.
- the torque of the motor amplified by the worm speed reduction mechanism is applied to the steering shaft as a steering assist force.
- the motor case is composed of a bottomed cylindrical case body and a plate fixed to the case body.
- the case body integrally has a cylindrical tubular portion to which the stator is fixed on the inner peripheral surface, and an annular bottom portion extending radially inward from one end of the tubular portion. .
- the bottom portion is provided with a housing portion for housing a bearing that supports the output shaft.
- the plate integrally has a base portion facing the bottom portion of the case body and a pair of mounting portions extending radially outward from the outer peripheral edge of the base portion.
- the base portion is provided with a fitting portion that is press-fitted to the outer periphery of a housing portion provided at the bottom of the case body, and the plate is fixed to the case body by press-fitting the fitting portion. .
- Through holes are formed in the pair of mounting portions of the plate, respectively, and fastening bolts are screwed into bolt holes formed in the housing through the through holes.
- a slight gap is formed between the portion of the base portion on the outer peripheral side of the fitting portion and the bottom portion of the case main body, and between the base portion and the housing.
- the vibration generated in the stator is reduced by the plate of the motor case, and the vibration transmitted to the housing is suppressed.
- the support rigidity of the case body and the stator with respect to the housing is low, and the output shaft tends to tilt due to G (acceleration) in the front, rear, left, right, and up and down directions, for example, when the vehicle is running.
- An object of the present invention is to provide a motor mounting structure, a motor unit, and a vehicle steering device.
- the present invention provides a motor mounting structure for mounting the motor case of a motor, in which a stator and a rotor are housed in a motor case, to an object to be mounted by means of a fastening member, wherein the motor case includes the stator. and a bottom portion protruding radially inward from one end of the cylindrical portion, and the bottom portion is provided with a fastening portion for receiving the fastening member. and a motor mounting structure, wherein the fastening portion is provided inside the outer peripheral surface of the cylindrical portion.
- the present invention provides a motor having a stator, a rotor arranged inside the stator, an output rotary shaft rotating integrally with the rotor, and a motor case housing the stator, a worm speed reduction mechanism having a worm connected to the output rotary shaft and a worm wheel meshing with the worm; a housing that accommodates the worm and the worm wheel; a fastening member that fastens the motor case and the housing;
- the motor case has a cylindrical portion that houses the stator, and a bottom that protrudes radially inward from one end of the cylindrical portion, and the fastening member is provided on the bottom.
- a motor unit in which a fastening portion for receiving is provided, and the fastening portion is provided inside the outer peripheral surface of the cylindrical portion.
- the present invention provides a vehicle steering apparatus that axially moves a steering shaft extending in the vehicle width direction of the vehicle to steer the steerable wheels of the vehicle, comprising: A steering apparatus for a vehicle is provided, which uses the above motor unit as a drive source for generating a moving force for axially moving the steered shaft.
- the motor mounting structure, the motor unit, and the vehicle steering device by mounting the motor case to the mounting body with the fastening member, the support rigidity of the motor is maintained, while the vibration generated by the motor is received. It is possible to suppress transmission to the mounting body.
- FIG. 2 is a schematic diagram showing the column shaft, column tube, sensor case, bracket, and motor unit of the steering device; It is a sectional view of a motor unit. It is a sectional view of a motor. It is a perspective view showing a motor case. It is a perspective view showing a housing. It is an external view of a motor case. It is an external view of a housing. It is explanatory drawing which exaggerates and shows the expansion-contraction vibration of a motor. It is explanatory drawing which exaggerates and shows the expansion-contraction vibration of a motor. FIG.
- FIG. 9B is a cross-sectional view of the motor case taken along line CC of FIG. 9A;
- FIG. 9B is a cross-sectional view of the motor case taken along line DD of FIG. 9B;
- FIG. 10 is a cross-sectional view showing a motor unit of a steering device according to a conventional example;
- 7 is a graph showing the amount of displacement generated in the bracket when a predetermined drive current is supplied to the motor in the steering device using the motor unit according to the embodiment and the comparative example. It is an outline view of a motor case concerning a modification.
- FIG. 1 is a schematic diagram showing a configuration example of a vehicle steering device according to an embodiment of the present invention.
- FIG. 1 shows the steering device viewed from the front of the vehicle.
- the left side of FIG. 1 corresponds to the right side of the vehicle, and the right side of FIG. 1 corresponds to the left side of the vehicle.
- the steering device 1 includes a steering shaft 2 connected to a steering wheel 10 that is steered by a driver, and an axial movement associated with the rotation of the steering shaft 2 to steer left and right front wheels 11 that are steered wheels of the vehicle.
- a rack shaft 12 as a shaft, a torque sensor 13 for detecting the steering torque applied to the steering wheel 10, a motor unit 3 for generating a steering assist force corresponding to the detected steering torque, and the motor unit 3 are controlled.
- a controller 30 is provided.
- the steering shaft 2 includes a column shaft 21 to which the steering wheel 10 is fixed at the tip, a pinion shaft 23 having pinion teeth 231 that mesh with the rack teeth 121 of the rack shaft 12, and between the column shaft 21 and the pinion shaft 23. It comprises an intervening intermediate shaft 22 , a universal joint 24 connecting the column shaft 21 and the intermediate shaft 22 , and a universal joint 25 connecting the intermediate shaft 22 and the pinion shaft 23 .
- the column shaft 21 includes an upper shaft 211 and a lower shaft 212 which are spline-fitted telescopically, a torsion bar 213 connected to the rear end of the lower shaft 212, and a rear end of the torsion bar 213. and an output shaft 214 .
- the torsion bar 213 has the toughness to transmit the steering torque to the output shaft 214 while being twisted by the steering torque applied to the steering wheel 10 .
- the torque sensor 13 detects the steering torque based on the twist amount of the torsion bar 213 .
- the rack shaft 12 is housed in a tubular rack housing 14 and extends in the vehicle width direction.
- Ball joint sockets 15 are fixed to both ends of the rack shaft 12, and tie rods 16 connected to the rack shaft 12 by these ball joint sockets 15 steer the left and right front wheels 11 via knuckle arms (not shown).
- An accordion-shaped bellows 17 made of rubber or resin is arranged on the outer peripheral side of the ball joint socket 15 .
- the pinion shaft 23 connected to the steering wheel 10 via the column shaft 21 and the intermediate shaft 22 rotates, and the meshing of the pinion teeth 231 and the rack teeth 121 causes the rack shaft 12 to rotate. move in the direction As the rack shaft 12 moves in the axial direction, the left and right front wheels 11 are steered through the tie rods 16 .
- the motor unit 3 includes a motor 4 that receives drive current supplied from a controller 30 and generates torque, a worm speed reduction mechanism 5 that has a worm 51 and a worm wheel 52, a housing 6 that houses the worm 51 and the worm wheel 52, and a fastening member (described later) for attaching the motor 4 to the housing 6 .
- the worm 51 is rotated by torque of the motor 4 .
- the worm wheel 52 is meshed with the worm 51 and rotates at a rotational speed lower than that of the worm 51 .
- An output shaft 214 is fixed to the worm wheel 52, and the torque of the motor 4 amplified by the worm speed reduction mechanism 5 is transmitted to the output shaft 214 as a steering assist force.
- This steering assist force is transmitted to the pinion shaft 23 via the intermediate shaft 22 and becomes a moving force that moves the rack shaft 12 in the axial direction. That is, the steering device 1 uses the motor unit 3 as a drive source that generates a moving force that moves the rack shaft 12 in the axial direction.
- FIG. 2 shows a column tube 26 housing a column shaft 21, an upper shaft 211 and a lower shaft 212, a sensor case 27 housing a torque sensor 13, a bracket 8 supporting the column tube 26 with respect to the vehicle body, and a motor unit 3.
- 1 is a schematic diagram showing the configuration of FIG.
- Column shaft 21 , column tube 26 , sensor case 27 , bracket 8 , and motor unit 3 constitute steering column device 20 .
- “upper” and “lower” refer to the vertical direction when the steering device 1 is mounted on the vehicle.
- FIG. 2 shows a state in which the steering column device 20 is viewed obliquely from above perpendicularly to the column shaft 21 .
- the column tube 26 has an outer tube 261 and an inner tube 262 , and a portion of the inner tube 262 on the steering wheel 10 side is housed inside the outer tube 261 . A rear end portion of the inner tube 262 is fitted and fixed to the sensor case 27 . Upper shaft 211 is rotatably supported by bearing 28 with respect to outer tube 261 .
- the bracket 8 has a pair of fixing plates 81 fixed to the outer tube 261, a pair of holding plates 821 holding the pair of fixing plates 81 in the vehicle width direction, and a top plate 822 arranged above the outer tube 261.
- a clamping member 82, an operation lever 83 for releasing the clamping state of the fixed plate 81 by the clamping member 82, a plate 84 fixed to a top plate 822 of the clamping member 82 and extending in the vehicle width direction, and the plate 84 It has a pair of capsules 85 detachably attached to both ends.
- the pair of capsules 85 are fixed to the vehicle body by bolts (not shown) inserted through the bolt insertion holes 850 .
- the operation lever 83 When the driver of the vehicle performs tilt adjustment and telescopic adjustment of the steering wheel 10 , the operation lever 83 is operated to release the clamping state of the fixing plate 81 by the clamping member 82 . Further, when the driver's secondary collision with the steering wheel 10 due to the collision of the vehicle occurs, the plate 84 is separated from the pair of capsules 85, and the pair of fixing plates 81, the clamping member 82 and the outer tube are separated. 261 and the upper shaft 211 move to the vehicle front side together with the steering wheel 10 .
- FIG. 3 is a cross-sectional view of the motor unit 3.
- FIG. 4 is a sectional view of the motor 4.
- the motor 4 includes a stator 41 that generates a magnetic field by driving current supplied from the controller 30, a rotor 42 arranged inside the stator 41, an output rotary shaft 43 that rotates integrally with the rotor 42, and the stator 41.
- the stator 41 is constructed by winding windings 412 around a plurality of teeth 411 arranged in a ring.
- 12 teeth 411 are arranged in a ring.
- the rotor 42 has a rotor core 421 and a plurality of magnets 422 fixed to the rotor core 421 .
- ten magnets 422 are arranged on the outer circumference of rotor core 421 .
- a plurality of teeth 411 and rotor core 421 are configured by laminating a plurality of electromagnetic steel sheets.
- the output rotary shaft 43 is inserted through the center of the rotor core 421 , one end projecting downward from the rotor core 421 is supported by the first bearing 46 , and the other end projecting upward from the rotor core 421 is the second bearing. are supported by bearings 47 of the The first bearing 46 is arranged between the output rotary shaft 43 and the motor case 44 , and the second bearing 47 is arranged between the output rotary shaft 43 and the lid 45 .
- the first and second bearings 46, 47 have outer rings 461, 471, inner rings 462, 472, and a plurality of rolling elements 463, 473 arranged between the outer rings 461, 471 and the inner rings 462, 472. ing.
- FIG. 5 is a perspective view showing the motor case 44.
- FIG. 6 is a perspective view showing the housing 6.
- FIG. 7 is an external view of the motor case 44 viewed from the direction of the rotation axis O1 of the output rotation shaft 43.
- FIG. 8 is an external view of the housing 6 viewed from the direction of the rotation axis O2 of the worm 51.
- FIG. 3 shows a cross section of the motor case 44 shown in FIG. 7 taken along the line AA, and a cross section of the housing 6 shown in FIG. 8 taken along the line BB.
- the motor case 44 is made of die-cast aluminum alloy, and has a cylindrical portion 441 that houses the stator 41, a plurality of flange portions 442 for fixing the lid 45, and one end of the cylindrical portion 441. It integrally has a bottom portion 443 provided so as to protrude radially inward from the portion.
- the lid body 45 is fixed to the motor case 44 by a plurality of bolts 90 that are screwed onto the plurality of flange portions 442 .
- the stator 41 is fixed inside the cylindrical portion 441 .
- a holding hole 400 for holding the outer ring 461 of the first bearing 46 is formed through the bottom 443 at the center of the bottom 443 , and the output rotary shaft 43 is inserted through the inner ring 462 of the first bearing 46 . ing.
- the bottom portion 443 is provided with an inner annular convex portion 444 that protrudes downward toward the housing 6 side, and a plurality of fastening portions 445 in which screw holes 440 are formed.
- the inner annular projection 444 is formed in an annular shape around the rotation axis O1 of the output rotation shaft 43 .
- the fastening portion 445 is provided inside the outer peripheral surface 441a of the cylindrical portion 441 corresponding to the outer peripheral side of the stator 41 when the motor case 44 is viewed from the bottom portion 443 side along the rotation axis O1 as shown in FIG. ing.
- the fastening portion 445 is formed to protrude inward from the inner peripheral surface 444 a of the inner annular convex portion 444 and is provided inside the outer peripheral surface 444 b of the inner annular convex portion 444 .
- the diameter of the outer peripheral surface 444b of the inner annular convex portion 444 (the outer diameter D 1 of the inner annular convex portion 444) is the diameter of the inner peripheral surface 441b of the cylindrical portion 441 to which the stator 41 is fixed (the inner diameter D 2 of the cylindrical portion 441). formed smaller than A tip surface 444 c of the inner annular projection 444 is a plane perpendicular to the rotation axis O 1 of the output rotation shaft 43 .
- the threaded hole 440 extends parallel to the rotation axis O1 .
- the controller 30 is arranged above the lid 45 and integrated with the motor 4 .
- the controller 30 includes a substrate 31 fixed to the lid 45 and a plurality of electronic components 32 mounted on the substrate 31 .
- the plurality of electronic components 32 are, for example, switching elements such as power transistors, CPUs (arithmetic processing units), and the like.
- the upper side of the substrate 31 is covered with a cover 33 attached to the lid 45 .
- the controller 30 may be arranged between the stator 41 and the bottom portion 443 of the motor case 44 . Also, the controller 30 may be separate from the motor 4 .
- the controller 30 supplies the windings 412 of the stator 41 with drive current having a magnitude corresponding to the steering torque and vehicle speed detected by the torque sensor 13 .
- the drive current supplied by the controller 30 is a three-phase AC current that causes the stator 41 to generate a rotating magnetic field.
- the rotor 42 rotates following the rotating magnetic field due to the attractive force and repulsive force acting between each tooth 411 and the magnet 422 .
- the worm 51 is arranged coaxially with the output rotary shaft 43 of the motor 4 and is connected to the output rotary shaft 43 via a coupling 91 .
- An output shaft 214 is inserted through the center of the worm wheel 52 , and relative rotation between the worm wheel 52 and the output shaft 214 is restricted by a key 92 .
- the housing 6 includes a main body portion 61 that accommodates the worm wheel 52, a cylindrical portion 62 that accommodates the worm 51, a mounting portion 63 that faces the bottom portion 443 of the motor case 44, and an annular portion provided on the outer periphery of the mounting portion 63. and a supported portion 65 formed with a pair of tilt bolt insertion holes 650 through which tilt bolts (not shown) that serve as tilt centers during tilt adjustment are inserted.
- a body portion 61 of the housing 6 is provided with a plurality of flange portions 611 having screw holes 610 into which bolts 93 (see FIG. 2) for fixing the sensor case 27 are screwed.
- a pair of bearings 94 and 95 that rotatably support the worm 51 are accommodated in the tubular portion 62 .
- the mounting portion 63 is shaped like a disk and protrudes in a direction perpendicular to the rotation axis O2 of the worm 51 from one end of the cylindrical portion 62 .
- An upper surface 63a of the mounting portion 63 serves as a contact surface with which a distal end surface 444c of the inner annular convex portion 444 of the motor case 44 abuts.
- the outer annular convex portion 64 protrudes upward from the upper surface 63 a of the mounting portion 63 .
- the protrusion height of the outer annular projection 64 from the upper surface 63 a of the mounting portion 63 is set so that the tip surface 64 a of the outer annular projection 64 does not come into contact with the motor case 44 . That is, the height of the outer annular projection 64 from the mounting portion 63 is set smaller than the axial length of the inner annular projection 444 . As a result, when the motor case 44 is attached to the housing 6, a gap 300 of a predetermined value is created between the motor case 44 and the tip surface 64a of the outer annular protrusion 64 in the direction of the rotation axis O1 .
- the motor 4 is attached to a housing 6 as an attached body by an attachment structure using bolts 7 as fastening members.
- the bolt 7 has a threaded portion 71 having a male thread 711 and a head portion 72 having a larger diameter than the threaded portion 71 .
- the mounting portion 63 of the housing 6 is formed with a plurality of bolt insertion holes 630 through which the threaded portions 71 of the bolts 7 are inserted.
- the bolt insertion hole 630 penetrates the mounting portion 63 in parallel with the rotation axis O2 of the worm 51, and opens to the upper surface 63a of the mounting portion 63 and the lower surface 63b of the mounting portion 63 opposite to the upper surface 63a. .
- the lower surface 63 b is part of the outer surface of the housing 6 .
- the plurality of bolt insertion holes 630 are formed to appear circular.
- a plurality of bolt insertion holes 630 may be formed like arcuate grooves or radially extending grooves.
- the motor case 44 is fastened to the housing 6 with three bolts 7 .
- a bottom portion 443 of the motor case 44 is provided with three fastening portions 445 corresponding to the three bolts 7 along the circumferential direction of the inner annular convex portion 444 .
- Each fastening portion 445 receives the bolt 7 by screwing the external thread 711 of the bolt 7 into the threaded hole 440 .
- an axial force is generated in the bolt 7 and the motor case 44 is fastened to the housing 6 .
- the mounting portion 63 of the housing 6 is formed with three bolt insertion holes 630 corresponding to the three bolts 7 along the circumferential direction of the outer annular convex portion 64 .
- the threaded portion 71 of each bolt 7 is inserted into the bolt insertion hole 630 from the lower surface 63b side of the mounting portion 63 toward the upper surface 63a side and screwed into the screw hole 440 of the motor case 44 .
- a head portion 72 of the bolt 7 contacts the lower surface 63 b of the mounting portion 63 .
- a washer may be interposed between the head 72 and the lower surface 63b.
- the motor case 44 and the housing 6 are positioned by fitting the inner annular protrusion 444 of the motor case 44 inside the outer annular protrusion 64 of the housing 6 .
- the outer diameter of the inner annular protrusion 444 is slightly smaller than the diameter of the inner peripheral surface 64b of the outer annular protrusion 64 facing the outer peripheral surface 444b of the inner annular protrusion 444 (inner diameter of the outer annular protrusion 64). ing.
- the inner annular protrusion 444 is fitted into the outer annular protrusion 64 so that the rotation axis O1 of the output rotary shaft 43 and the rotation axis O2 of the worm 51 are aligned.
- the plurality of bolt insertion holes 630 of the housing 6 and the plurality of screw holes 440 of the motor case 44 can be easily communicated by relatively rotating the housing 6 and the motor 4 around the rotation axes O1 and O2 . can be done.
- FIG. 9A and 9B are explanatory diagrams exaggeratingly showing expansion and contraction vibrations of the motor 4.
- FIG. 9A shows a state in which the diameter of the cylindrical portion 441 of the stator 41 and the motor case 44 is expanded in the horizontal direction of the drawing and contracted in the vertical direction of the drawing
- FIG. 9B shows the state in which the stator 41 and the motor case 44 are expanded in the vertical direction of the drawing. It shows a state in which the diameter is reduced in the horizontal direction of the drawing.
- the arrow F1 indicates the attractive force that the teeth 411 of the stator 41 receive from the magnets 422
- the arrow F2 indicates the repulsive force that the teeth 411 receive from the magnets 422.
- FIGS. 9A and 9B A two-dot chain line shown in FIGS. 9A and 9B indicates the shape of the outer edge of the cylindrical portion 441 when current is not supplied to the winding 412 .
- FIG. 10A is a sectional view of the motor case 44 taken along line CC of FIG. 9A.
- FIG. 10B is a cross-sectional view of the motor case 44 taken along line DD of FIG. 9B.
- the stator 41 expands in the direction receiving the repulsive force from the magnet 422 and contracts in the direction receiving the attractive force.
- the shape of the outer peripheral surface 441a of the cylindrical portion 441 of the motor case 44 expands and contracts in an elliptical shape with respect to the shape indicated by the two-dot chain line in FIGS. 9A and 9B.
- the major axis direction and the minor axis direction of this elliptical shape rotate together with the rotor 42 about the rotation axis O1 .
- the bottom portion 443 of the motor case 44 also bends as shown in FIGS. 10A and 10B. The bending of the bottom portion 443 is small on the central side near the holding hole 400 and large on the outer edge side.
- the fastening portion 445 radially inward of the outer peripheral surface 441a of the cylindrical portion 441 corresponding to the outer peripheral side of the stator 41, the flexural vibration of the bottom portion 443 caused by the expansion/contraction vibration of the cylindrical portion 441 is prevented from occurring in the housing. 6 is suppressed.
- the rigidity of the portion inside the outer peripheral surface 444b of the inner annular projection 444 of the bottom portion 443 is increased. Since the fastening portion 445 is provided at the portion where the cylindrical portion 441 expands and contracts, transmission of the expansion/contraction vibration of the cylindrical portion 441 to the housing 6 is further suppressed.
- the tip surface 444c of the inner annular projection 444 of the motor case 44 contacts the upper surface 63a of the mounting portion 63 of the housing 6, the tip surface 64a of the outer annular projection 64 of the housing 6 does not contact the motor case 44. Due to the structure, transmission of the bending of the bottom portion 443 of the motor case 44 , which increases toward the outer edge side, to the housing 6 is suppressed.
- FIG. 11 is a sectional view showing a motor unit 3A of a steering device according to a comparative example.
- This motor unit 3A is configured in the same manner as the motor unit 3 according to the above-described embodiment, except that the mounting structure of the motor 4A to the housing 6A is different.
- the same reference numerals as in FIG. 3 denote the same components as those described in the above embodiment.
- a motor case 44A of the motor 4A has a flat bottom portion 446 that protrudes radially inward from the end portion of the cylindrical portion 441, and a pair of flange portions 447 that are provided on the outer peripheral side of the bottom portion 446. ing.
- the housing 6 ⁇ /b>A has a flat mounting portion 66 facing the bottom portion 446 and a pair of flange portions 67 provided on the outer periphery of the mounting portion 66 .
- a pair of flange portions 447 of the motor case 44A are fastened by bolts 96 to the pair of flange portions 67 of the housing 6A, respectively.
- FIG. 12 shows the center of the plate 84 of the bracket 8 when the capsule 85 is fixed to the fixed member and a predetermined drive current is supplied to the motor 4 in the steering device 1 using the motor unit 3 according to the above embodiment.
- the magnitude of the displacement generated in the portion 840 (see FIG. 2), and the magnitude of the displacement generated in the central portion 840 of the plate 84 of the bracket 8 when the motor unit 3 is replaced with the motor unit 3A according to the comparative example. is a graph showing 12, the position of the central portion 840 of the plate 84 when no drive current is supplied to the stator 41 is used as a reference position, and the rotor 42 makes one rotation with respect to the stator 41. It shows the maximum amount of displacement from the reference position during the
- the motor case 44 is attached to the housing 6 by the three bolts 7, for example, two bolts arranged symmetrically about the rotation axis O1 of the output rotation shaft 43 Compared to the case where the motor case 44 is attached to the housing 6 with the bolts 7, the effect of suppressing the transmission of vibration from the motor 4 to the housing 6 is enhanced. That is, when the motor case 44 is attached to the housing 6 by two bolts 7 arranged symmetrically with respect to the rotation axis O1 , the attractive force and repulsive force of the plurality of magnets 422 of the rotor 42 form an elliptical shape.
- the bending of the bottom portion 443 of the motor case 44 increases at the two fastening portions 445, and the motor 4 moves from the motor 4 to the housing 6 due to vibration. Easy to transmit displacement.
- three fastening portions 445 are provided along the circumferential direction of the inner annular protrusion 444, so that the phase of bending of the bottom portion 443 of the motor case 44 and the phase of the fastening portions 445 , the transmission of vibration from the motor 4 to the housing 6 can be suppressed.
- the motor 4 can be moved from the motor 4 to the housing 6. vibration transmission can be suppressed.
- one of the three fastening portions 445 shown in FIG. 7 may be omitted, and the motor case 44 may be constructed as shown in FIG.
- one fastening portion 445 is rotated by a predetermined angle ⁇ from a position P that is symmetrical with respect to the other fastening portion 445 across the rotation axis O1 in the circumferential direction of the inner annular convex portion 444. It is set in a position shifted to the In this case also, vibration transmission from the motor 4 to the housing 6 can be suppressed compared to the case where the two fastening portions 445 are provided at symmetrical positions with respect to the rotation axis O1 .
- fastening portions 445 may be provided along the circumferential direction of the inner annular convex portion 444 . That is, the number of fastening portions 445 is desirably two or more, and more desirably three or more.
- the vibration mode of the side surfaces of the stator 41 and the motor case 44 due to the expansion/contraction vibration generated by the motor 4 is not an elliptical shape but a triangular or larger N-sided shape (N is a natural number of 3 or more)
- the circumference of the fastening portion 445 Vibration transmission from the motor 4 to the housing 6 can be suppressed by arranging the directions slightly shifted from the angular pitch obtained by dividing 360 degrees by N.
- the configuration of the steering device is not limited to the column-assist type.
- two pinion gear shafts are meshed with a rack shaft, one pinion gear shaft is connected to a steering wheel via a universal joint or the like, and a dual pinion type one in which a steering assist force is applied to the other pinion gear shaft, or a rack
- Various known types of steering such as a rack parallel type in which a motor is arranged in parallel with a shaft and the torque of the motor is applied to the rack shaft as an axial steering assist force via a belt and ball screw mechanism. It is possible to apply the present invention to the device.
- the bolt 7 having the threaded portion 71 and the head portion 72 is used as the fastening member. It may be used as a fastening member in combination with a nut. A rivet may also be used as the fastening member.
- the present invention can be applied not only to steering devices but also to various mechanical devices such as industrial machines equipped with motors, and in particular to mechanical devices such as semiconductor manufacturing equipment that require a high degree of low vibration. can be suitably applied to
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Abstract
Description
本発明の実施の形態について、図面を参照して説明する。なお、以下に説明する実施の形態は、本発明を実施する上での好適な具体例として示すものであり、技術的に好ましい種々の技術的事項を具体的に例示している部分もあるが、本発明の技術的範囲は、この具体的態様に限定されるものではない。
図1は、本発明の実施の形態に係る車両用のステアリング装置の構成例を示す模式図である。図1では、ステアリング装置を車両前方から見た状態を示しており、図1の左側が車両右側に、また図1の右側が車両左側に、それぞれ相当する。
以上説明したように、上記の実施の形態に係るモータユニット3、及びこれを用いたステアリング装置1によれば、モータ4で発生する拡縮振動がハウジング6に伝達されることを抑制することが可能となる。これにより、モータ4の拡縮振動によって発生する音が運転者や同乗者に異音として聴覚されて不快感を与えることを抑制することができる。また、複数のボルト7によってモータケース44をハウジング6に取り付けることにより、ハウジング6に対するモータ4の支持剛性が確保される。
以上、本発明を実施の形態に基づいて説明したが、この実施の形態は請求の範囲に係る発明を限定するものではない。また、実施の形態の中で説明した特徴の組合せの全てが発明の課題を解決するための手段に必須であるとは限らない点に留意すべきである。また、本発明は、その趣旨を逸脱しない範囲で、一部の構成を省略し、あるいは構成を追加もしくは置換して、適宜変形して実施することが可能である。またさらに、例えば下記のように変形することも可能である。
11…前輪(転舵輪)
12…ラックシャフト(転舵シャフト)
3…モータユニット
4…モータ
41…ステータ
42…ロータ
43…出力回転軸
44…モータケース
440…ねじ穴
441…円筒部
443…底部
444…内側環状凸部
444b…外周面
445…締結部
5…ウォーム減速機構
51…ウォーム
52…ウォームホイール
6…ハウジング
61…本体部
62…筒状部
63…取付部
630…ボルト挿通孔
64…外側環状凸部
7…ボルト(締結部材)
Claims (18)
- ステータ及びロータがモータケースに収容されたモータの前記モータケースを締結部材によって被取付体に取り付けるモータ取付構造であって、
前記モータケースは、前記ステータを収容する円筒部と、前記円筒部の一方の端部から径方向内側に突出するように設けられた底部とを有し、
前記底部に、前記締結部材を受容する締結部が設けられており、
前記締結部が前記円筒部の外周面よりも内側に設けられている、
モータ取付構造。 - 前記被取付体は、前記締結部材を挿通させる挿通孔が形成された取付部を有する、
請求項1に記載のモータ取付構造。 - 前記締結部材がボルトであり、
前記締結部に前記ボルトが螺合するねじ穴が形成されており、
前記ボルトが、前記取付部の前記挿通孔に挿通されて前記ねじ穴に螺合している、
請求項2に記載のモータ取付構造。 - 前記被取付体に設けられた外側環状凸部の内側に前記モータケースの前記底部に設けられた内側環状凸部が嵌合し、
前記内側環状凸部の外周面よりも内側に前記締結部が設けられている、
請求項1又は2に記載のモータ取付構造。 - 前記外側環状凸部の高さが前記内側環状凸部の軸方向長さより小さく設定されている、
請求項4に記載のモータ取付構造。 - 前記内側環状凸部の周方向に沿って二つ以上の前記締結部が設けられている、
請求項4に記載のモータ取付構造。 - 前記底部に二つの前記締結部が設けられており、当該二つの前記締結部が前記モータの回転軸線を挟んで対称となる位置から所定角度だけずらして設けられている、
請求項6に記載のモータ取付構造。 - 前記モータに発生する拡縮振動による前記ステータ及び前記モータケースの前記円筒部の振動モードが楕円形状ではなく三角形以上のN角形状(Nは3以上の自然数)になる場合、前記二つ以上の前記締結部が前記周方向に沿って360度をNで割った角度ピッチからそれぞれ所定角度だけずらして配置されている、
請求項7に記載のモータ取付構造。 - ステータ、前記ステータの内側に配置されたロータ、前記ロータと一体に回転する出力回転軸、及び前記ステータを収容するモータケースを有するモータと、
前記出力回転軸と連結されたウォーム、及び前記ウォームに噛み合うウォームホイールを有するウォーム減速機構と、
前記ウォーム及び前記ウォームホイールを収容するハウジングと、
前記モータケースと前記ハウジングとを締結する締結部材と、を備え、
前記モータケースは、前記ステータを収容する円筒部と、前記円筒部の一方の端部から径方向内側に突出するように設けられた底部とを有し、
前記底部に、前記締結部材を受容する締結部が設けられており、
前記締結部が前記円筒部の外周面よりも内側に設けられている、
モータユニット。 - 前記ハウジングは、前記締結部材を挿通させる挿通孔が形成された取付部を有し、
前記取付部が前記モータケースの前記底部と対向している、
請求項9に記載のモータユニット。 - 前記締結部材がボルトであり、
前記締結部に前記ボルトが螺合するねじ穴が形成されており、
前記ボルトが、前記取付部の前記挿通孔に挿通されて前記ねじ穴に螺合している、
請求項10に記載のモータユニット。 - 前記ハウジングは、前記ウォームホイールを収容する本体部と、前記ウォームを収容する筒状部とを有し、前記取付部が前記筒状部の一方の端部から前記ウォームの回転軸線に対して垂直な方向に張り出して形成されている、
請求項10に記載のモータユニット。 - 前記ハウジングに設けられた外側環状凸部の内側に前記モータケースの前記底部に設けられた内側環状凸部が嵌合しており、
前記内側環状凸部の外周面よりも内側に前記締結部が設けられている、
請求項9乃至12の何れか1項に記載のモータユニット。 - 前記外側環状凸部の高さが前記内側環状凸部の軸方向長さより小さく設定されている、
請求項13に記載のモータユニット。 - 前記内側環状凸部の周方向に沿って二つ以上の前記締結部が設けられている、
請求項13に記載のモータユニット。 - 前記底部に二つの前記締結部が設けられており、当該二つの前記締結部が前記モータの回転軸線を挟んで対称となる位置から所定角度だけずらして設けられている、
請求項15に記載のモータユニット。 - 前記モータに発生する拡縮振動による前記ステータ及び前記モータケースの前記円筒部の振動モードが楕円形状ではなく三角形以上のN角形状(Nは3以上の自然数)になる場合、前記二つ以上の前記締結部が前記周方向に沿って360度をNで割った角度ピッチからそれぞれ所定角度だけずらして配置されている、
請求項16に記載のモータユニット。 - 車両の車幅方向に延在する転舵シャフトを軸方向に移動させて前記車両の転舵輪を転舵する車両用ステアリング装置であって、
前記転舵シャフトを軸方向に移動させる移動力を発生する駆動源として、請求項9に記載のモータユニットを用いる、
車両用ステアリング装置。
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JP2012090495A (ja) * | 2010-10-22 | 2012-05-10 | Jtekt Corp | モータ及び電動パワーステアリング装置 |
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