WO2007055296A1 - 電動式パワーステアリング装置 - Google Patents
電動式パワーステアリング装置 Download PDFInfo
- Publication number
- WO2007055296A1 WO2007055296A1 PCT/JP2006/322402 JP2006322402W WO2007055296A1 WO 2007055296 A1 WO2007055296 A1 WO 2007055296A1 JP 2006322402 W JP2006322402 W JP 2006322402W WO 2007055296 A1 WO2007055296 A1 WO 2007055296A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- motor
- housing
- electric power
- power steering
- worm
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0409—Electric motor acting on the steering column
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19623—Backlash take-up
Definitions
- the present invention relates to an electric power steering device, and more particularly to a small and lightweight electric power steering device.
- An electric power steering device detects a steering torque and other signals generated in a steering shaft by operating a steering wheel, drives an electric motor based on the detection signal, and outputs it via a speed reducer Rotating shaft to assist steering force
- Patent Document 1 Japanese Patent Laid-Open No. 2005-312087
- Patent Document 2 Japanese Patent Laid-Open No. 9-30432
- Patent Document 3 Japanese Patent Laid-Open No. 2005-219708
- the present invention has been made in view of the problems of the prior art, and provides an electric power steering device capable of achieving a small size and light weight without lowering the output by increasing heat transfer. For the purpose.
- the rotating shaft of the electric motor is rotatably supported by two ball bearings, and the outer ring of the worm side ball bearing is directed to the outer ring of the other bearing.
- a bearing preloading device that applies preload to two bearings and eliminates backlash by pressing them is installed.
- the preload may increase the operating torque of the bearing, increase the operating torque of the entire steering system, and so-called steering wheel return may be deteriorated.
- a worm preload device may be provided in the vicinity of the ball bearing on the worm side in order to eliminate backlash between the tooth surfaces when the worm and the worm wheel are combined (see Patent Document 3). ). Providing such a worm preload device makes it difficult to provide a bearing preload device. In addition, if the motor output is increased, heat generation will increase, and it will be difficult to reduce the size in order to sufficiently dissipate the heat.
- the present invention has been made in view of the above problems, and is compact and supports the rotating shaft of the electric motor without backlash (inside the bearing, the backlash of the worm / worm wheel coupling portion, etc.). It is an object of the present invention to provide an electric power steering device that can be used.
- a motor attached to the housing and rotating a rotating shaft
- An output shaft that outputs steering force to steer the wheels
- a power transmission mechanism for connecting the rotating shaft of the motor and the output shaft so that power can be transmitted
- the power transmission mechanism includes a worm formed integrally with the rotating shaft, and a worm wheel coupled to the output shaft.
- a motor attached to the housing and rotating a rotating shaft
- An output shaft that outputs steering force to steer the wheels
- a power transmission mechanism for connecting the rotating shaft of the motor and the output shaft so that power can be transmitted
- the power transmission mechanism includes a worm formed integrally with the rotary shaft, and a worm wheel connected to the output shaft,
- the housing force of the power transmission mechanism formed integrally serves as at least a part of the frame of the motor.
- the power transmission mechanism has a worm integrally formed with the rotating shaft and a worm wheel connected to the output shaft. It is possible to provide a compact and simple electric power steering device that can support the shaft without play in the rotational direction.
- the power transmission mechanism is Since it has a worm formed integrally with the rotating shaft and a worm wheel connected to the output shaft, the rotating shaft can be supported with little play, and a compact and simple electric power steering device can be provided. Can be provided.
- the integrally formed housing of the power transmission mechanism also serves as at least a part of the frame of the motor, the thermal power generated by the motor force can be reduced. The heat is transferred through and discharged to the outside. As a result, compared to the case where the housing and the frame are separate, the heat transfer performance is greatly improved, and the cooling effect of the motor is enhanced, thereby increasing the output of the motor while reducing the size and weight. As a result, the entire electric power steering apparatus can be reduced in size.
- the housing of the power transmission mechanism is separate from the motor frame, the motor is assembled, so a partition plate and a flange for mounting may be provided on the frame side. Space is required.
- a partition plate becomes unnecessary, and the motor can be reduced in size accordingly.
- the coil wire of the motor that is the source of heat, the heat capacity and the surface area are large, and the distance to the housing of the power transmission mechanism is shortened. I can expect. Power!
- it is not necessary to provide a flange, which is necessary when the housing of the power transmission mechanism is separate from the motor frame it is possible to reduce the size and weight of the electric power steering device.
- the housing of the power transmission mechanism surrounds at least the rotor and the stator of the motor because heat generated by the coil winding force can be more efficiently transmitted to the housing side.
- the motor is a brushless motor!
- the housing of the power transmission mechanism is made of aluminum, aluminum alloy, magnesium, or magnesium alloy, it generally has a higher thermal conductivity than iron, and thus heat conductivity can be improved. Also, because the motor can be small and light weight! [0020] When the rib of the housing of the power transmission mechanism is disposed at least in the vicinity of the connecting portion of the brushless motor, the strength of the housing can be increased and the surface area of the housing can be increased, thereby increasing the surface of the brushless motor. The heat dissipation of motor power can also be promoted.
- the rotating shaft is supported by the housing via a four-point contact ball bearing, the rotating shaft is coupled with a worm formed integrally with the rotating shaft so that the rotating shaft is prevented from being loose. Can be supported.
- worm preload mechanism that applies preload to the tooth surface of the worm and the tooth surface of the worm wheel meshed therewith.
- the rotary shaft is supported at both ends by two bearings with respect to the housing, and the bearing supported on the motor side is a four-point contact ball bearing.
- the housing is preferably integrated with a frame of the motor. “Integrated” includes both partially integrated and fully integrated.
- the material of the housing is preferably aluminum, an aluminum alloy, magnesium, or a magnesium alloy.
- FIG. 1 is a schematic view of a steering mechanism including an electric power steering apparatus 100 according to the present embodiment.
- FIG. 2 is a cross-sectional view of electric power steering apparatus 100 used in the present embodiment, indicated by arrow II in FIG.
- FIG. 3 is a view of the configuration of FIG.
- FIG. 4 (a) is a view of the configuration of FIG. 3 taken along the line IV-IV and viewed in the direction of the arrow, and FIG. 4 (b) is shown by arrow IVB in FIG. 4 (a). It is a figure which expands and shows a site
- FIG. 5 is an enlarged view showing an arrow V part in FIG. 3.
- FIG. 6 is a view of the configuration of FIG. 5 taken along the VI-VI line and viewed in the direction of the arrow.
- FIG. 7 is a perspective view of a worm preload mechanism 120.
- FIG. 8 is an exploded view of the worm preload mechanism 120.
- FIG. 9 is a perspective view of a housing according to a modified example.
- FIG. 10 is a schematic view of a steering mechanism including an electric power steering apparatus 100 that is useful for another embodiment.
- FIG. 1 is a schematic diagram of a steering mechanism including a column type electric power steering apparatus 100 according to the present embodiment.
- a tubular column 15 is supported on a vehicle body 26 via a bracket 24 so as to be movable in a tilt direction (arrow A direction) and a telescopic direction (arrow B direction).
- a steering shaft 17 having a steering wheel 1 attached to the upper end portion is inserted into a steering column 15 and is rotatably supported with respect to the steering column 15.
- the steering column 15 and the steering shaft 17 are provided with a V, so-called collapsible structure that deforms so as to contract when a large load is applied in the axial direction during a secondary collision or the like.
- the lower end of the steering shaft 17 is connected to the input shaft 102 of the electric power steering apparatus 100 attached to the vehicle body 26 by the bracket 18.
- the output shaft 103 of the electric power steering apparatus 100 is connected to the upper end of the intermediate shaft 8 via the universal joint 7A, and the lower end of the intermediate shaft 8 is connected to the pion shaft 10 via the universal joint 7B.
- the pion formed on the pion shaft 10 is meshed with the rack teeth of the rack shaft 9. Both ends of the rack shaft 9 are connected via a tie rod 13 to a steering mechanism for steering a wheel (not shown).
- FIG. 2 is a cross-sectional view of electric power steering device 100 used in the present embodiment, indicated by arrow II in FIG.
- An input shaft 102 and an output shaft 103 are arranged in a housing 101 formed of aluminum or an aluminum alloy, magnesium or a magnesium alloy composed of a main body 101b and a lid member 101a.
- the input shaft 102 is rotatably supported with respect to the housing 101 by a bearing (not shown).
- the hollow output shaft 103 is rotatably supported with respect to the housing 101 by bearings 104 and 110.
- a torsion bar 105 connected by pressing the right end into the input shaft 102 and pin-connecting the left end to the output shaft 103 extends through the output shaft 103.
- a detection device for detecting steering torque that is, a torque sensor 106 is provided at a position facing the outer periphery near the right end in Fig. 2 of the output shaft 103 based on the twisting of the torsion bar 105 in proportion to the received torque.
- the torque sensor 106 is a rotary non-contact torque sensor, and is a phase between the input shaft 102 and the output shaft 103 based on the torsion of the torsion bar 105.
- the diagonal displacement is detected by a coil as a change in impedance in a predetermined magnetic circuit, and output as an electric signal to a control circuit (not shown).
- a worm wheel 107 is disposed between the bearings 104 and 110 at the center of the output shaft 103.
- the worm wheel 107 includes a cored bar 107a attached so as to rotate integrally with the output shaft 103 by press-fitting or the like, and a toothed portion 107b of grease formed on the outer periphery thereof.
- the tooth portion 107b of the worm wheel 107 is meshed with a worm 108 formed integrally with a rotating shaft of a motor 109 attached to the housing 101.
- the worm wheel 107 and the worm 108 constitute a power transmission mechanism (worm mechanism). Therefore, the housing 101 is a housing that houses the power transmission mechanism.
- FIG. 3 is a view of the configuration of FIG. 1 taken along the ⁇ - ⁇ line and viewed in the direction of the arrow.
- Fig. 4 (a) is a view of the configuration of Fig. 3 taken along line IV-IV and viewed in the direction of the arrow, and
- Fig. 4 (b) is an enlarged view of the portion indicated by arrow IVB in Fig. 4 (a).
- FIG. 3 a brushless motor 109 is arranged in an inner diameter portion 223a of a frame body 223A formed integrally with the housing 101. As shown in FIG.
- the brushless motor 109 has a motor housing (also referred to as a frame) 223 that houses a stator 221 and a resolver 222 as a rotation angle detector that detects a rotation angle of the rotor.
- the motor housing 223 is divided into two parts: a motor housing main body 223A that is formed integrally with the housing 101 that houses the worm mechanism and that houses the stator 221, and a motor housing lid 223B that houses the resolver 222. It is fixed with an inlay fit.
- the number of slots of the brushless motor that extends in the axial direction from the end surface on the motor housing lid 223B side in the axial direction is approximately equal to the axial length of the stator 221 on the inner peripheral surface of the inner diameter portion 223a of the motor housing body 223A.
- the recesses 230 (see Fig. 4) having a circular arc cross section are formed at equal intervals.
- the motor housing lid 223B is formed with an inner diameter portion 223b that accommodates the resolver 222 on the inner peripheral surface opposite to the motor housing main body 223A.
- a small-diameter portion 223c that fits into the four-point contact ball bearing 112 is formed in communication with the portion 223b.
- Fin-shaped ribs projecting in the radial direction at a position facing the resolver 222 in the outer periphery (near the motor connection) are kept at predetermined intervals in the circumferential direction.
- the number is integrally formed.
- the motor housing cover 223B is integrally formed by forging one of aluminum, aluminum alloy, magnesium, and magnesium alloy using a die casting machine. It would be nice to have a machine cover!
- the stator 221 is fitted and disposed in the inner diameter portion 223a of the motor housing body 223A.
- the stator 221 has a configuration in which T-shaped split cores 241 in which 12 electromagnetic steel plates are laminated are connected in an annular shape.
- Each of the split cores 241 has a stator yoke 242 whose outer peripheral surface is arcuate and extends in the circumferential direction in a cross section orthogonal to the axial direction, and a circumferential center on the inner peripheral surface of the stator yoke 242
- a magnetic core portion 243 that extends inwardly toward the central axis is formed in a T-shaped iron core, and a hat portion is formed at the tip of the magnetic pole portion 243.
- a motor coil 244 is mounted on the magnetic pole portion 243 in a concentrated manner.
- the hat portion has a shape in which a slight slot opening width is formed in a state where 12 T-shaped split cores 241 are combined to form an annular shape, and the slot opening width is a magnet coil used for the motor coil 244. It is set below the diameter of the bearing.
- the surface of the stator yoke 242 that fits into the motor housing body 223A has a flat surface that is directly behind the neck of the force magnetic pole part 243 that has substantially the same curvature as that of the motor housing. When it is fitted, it has a shape that makes line contact at two points.
- the slot side of the stator yoke 242 has a straight line shape orthogonal to the neck center line of the magnetic pole portion 243.
- the portion where the adjacent divided core 241 abuts is a linear shape of ⁇ 15 ° intersecting at the center of rotation with respect to the center line of the magnetic pole portion 243 to which the motor coil 244 is applied, and is in a shape in surface contact with each other.
- the cross section engaging with the concave portion 230 of the motor housing main body 223A at both ends in the circumferential direction on the outer peripheral surface of the outer peripheral side base portion 242 has a quarter-circular convex half portion 245 in the axial direction. It is formed across the entire area. Therefore, when the split cores 241 are connected to each other, as shown in FIG. 4 (b), the concave portions 230 engaged with the concave portions 230 formed in the motor housing body 223A having a semicircular cross section at both convex half portions 245, and Convex with the same curvature and slightly shifted from the center point of the recess 30 of the motor housing body 223A to the stator center axis side with the same curvature.
- Part 246 is formed. Then, in a state where the divided cores 241 are connected in an annular shape, the convex portion 246 is welded by laser welding or the like, so that an annular stator 221 is formed. This state 221 force of the motor housing body 223A The protrusion 246 is engaged with the flange 230 on the inner diameter flange 223a. At this time, the stator yoke abutting portion 247 that abuts the yoke 243 of the stator 221 formed on the motor housing body 223A and the stator front end abutting portion 248 that abuts the leading end of the stator 221 are the two parts of the stator 221. The shape is in contact with the end face, and a gap between the coil end at that portion is filled with a heat transfer body 249 made of epoxy resin.
- each phase of the motor coil 244 is connected to a four-layered annular bus bar 250 that is insulated for each Y-connection midpoint, U-phase, V-phase, and W-phase (see Fig. 3).
- the bus bar 250 is fit into the motor housing body 223A.
- the split core 241 by setting the slot opening width formed by the hat portion 243a to be equal to or smaller than the diameter of the magnet wire used for the motor coil 244, the motor coil 244 can be loosened or disconnected. Because it does not get caught in the air gap! /, The steering wheel lock due to the motor lock can be prevented.
- the surface formed on the motor housing main body 223A of the stator yoke 242 is shaped so as to be in line contact at two points when the motor housing is fitted, so that it is opposed to the magnetic pole 257 when torque is generated. Even if the force is strong, the T-shaped split core 241 does not fall easily, so noise and vibration can be reduced.
- the slot side of the stator yoke 242 has a linear shape orthogonal to the center line of the neck of the magnetic pole portion 257, so that the stator yoke 242 does not interfere with the winding, so that high density A simple shoreline is possible.
- a semi-cracked convex half 245 is provided on the outer peripheral side of the portion where the stator yoke 242 of the adjacent split core 241 abuts, thereby simplifying.
- the T-shaped split core 241 does not fall down easily even when a reaction force is applied to the magnetic pole 257 when a torque is generated that has a larger abutting area than the split core method with a split annular stator yoke.
- the convex half 245 protruding to the outer peripheral side is welded, the magnetic flux passing through the welded portion can reduce the hysteresis loss slightly. These effects can reduce noise, vibration and iron loss.
- the convex portion 246 has a large gap in the radial direction but almost no gap in the rotational direction with respect to the concave portion provided in the motor housing body 223A.
- the bead can be shrink-fitted into the motor housing main body 223A without removing the bead bulge generated when welding.
- only the ambient temperature of the brushless motor 109 suddenly rises and only the motor housing body 223A becomes hot, or the motor housing body 223A cracks due to unexpected external force, etc. Even if the interference of the stator 221 disappears, the stator 221 does not run idle, so that torque reduction, torque ripple, torque difference depending on the rotation direction, self-steering, and other phenomena can be reliably prevented.
- the recess 230 of the motor housing main body 223A extends in the same shape from the side where the motor housing lid 223B is attached to the stator fitting portion to a position slightly deeper than the stator yoke butting portion.
- the stator 221 can be formed of a T-shaped electrical steel sheet having the same shape without the need to change the shape of the electrical steel sheet depending on the direction of pressure.
- a resolver rotor 2 22r is opposed to the resolver stator 222s attached to the inner diameter portion 223b of the motor housing lid portion 223B. It is fixed with a nut 222 ⁇ to rotate. Resolver stator 222s And the resolver rotor 222r constitute the resolver 222.
- the magnetic pole portion 257 includes a cylindrical rotor yoke 258 that passes through the rotating shaft 109a, eight permanent magnets 259 that are bonded to the outer peripheral surface of the rotor yoke 258 at equal intervals in the circumferential direction,
- the permanent magnet 259 is composed of a cap 260 made of austenitic nonmagnetic stainless steel covering the outer peripheral surface of the permanent magnet 259.
- the permanent magnet 259 as a magnetic pole is a segment magnet divided for each pole, and the shape thereof is formed in a saddle shape in which the arc center on the outer peripheral side is intentionally shifted from the rotation center.
- the outer peripheral part of the permanent magnet 259 constituting the magnetic pole part 257 is covered with a cap 260, and the cap 260 is fixed to the permanent magnet 259 by using a force adhesive that is a clearance fit. Furthermore, the end face of the cap 260 is fixed more firmly by caulking with rivets.
- a gap between the inner diameter portion 223a of the motor housing main body 223A and the rotating shaft 109a is sealed with a seal 109e.
- One end (left end in FIG. 3) of the rotating shaft 109a of the motor 109 is supported by a four-point contact ball bearing 112 with respect to the motor housing cover 223B.
- FIG. 5 is an enlarged view of the arrow V portion of FIG. 3, and FIG. 6 is a view of the configuration of FIG. 5 cut along the VI-VI line and viewed in the direction of the arrow.
- FIG. 7 is a perspective view of the worm preload mechanism 120, and FIG. 8 is an exploded view of the worm preload mechanism 120.
- a bush 121 having an elastic member formed therein is interposed between the inner ring of the ball bearing 113 and the end of the rotating shaft 109a.
- a holder 122 having an L-shaped cross section is interposed between the ball bearing 113 and the bag hole 101f of the housing 101.
- a first tip 109A and a second tip 109B having a smaller diameter are provided at the end of the rotating shaft 109a, and the second tip 109B protrudes from the holder 122, and its surroundings. Is provided with a preload pad 123.
- Ball bearing 113 axial direction The positioning is performed by the outer flange 121a of the bush 121 that abuts on the inner ring and the flange portion 122a of the holder 122 that abuts on the outer ring opposite to the bush 121.
- the inner flange 121b of the bush 121 is in contact with the outer peripheral surface of the second tip portion 109B.
- the preload pad 123 is formed by injection molding or the like of a synthetic resin mixed with a solid lubricant, and has a tapered inner peripheral surface 123b that expands in diameter toward the inner side on the inner periphery. Yes.
- the second tip 109B of the rotating shaft 109a is fitted to the tapered inner peripheral surface 123b.
- the preload pad 123 has an inverted T shape when viewed from the direction shown in FIG. 6, that is, a flat portion 123a, 123a provided on the outer periphery in parallel on both sides of the shaft, and a lower end thereof. Steps 1 23c and 123c connected to the!
- the preload pad 123 is combined with a holder 122 that can be fitted and fixed to the housing 101. That is, the holder 122 has four claw portions 12 2c protruding in the axial direction.
- the left claw portions 122c and 122c are close to the left flat portion 1 23a of the preload pad 123.
- the right claw portions 122c and 122c are disposed close to the right plane portion 123a of the preload pad 123.
- the claw portions 122c each have an outer surface that substantially matches the circumferential surface of the preload pad 123 in a state of being combined with the preload pad 123.
- One end 124a bent between the left claw portions 122c and 122c is inserted, the other end 124b bent between the right claw portions 122c and 122c is inserted, and the outer periphery of the preload pad 123 is stacked in layers.
- the torsion coil 124 is arranged in such a way as to surround!
- the combination of the holder 122 and the preload pad 123 prevents relative movement in the axial direction of each other. Further, the both end portions 124a and 124b of the torsion coil 124 are disposed between the adjacent claw rods 122c and 122c provided on the flange of the honoreda 122, while the outer diameter side surfaces of the claw portions 122c and 122c are arranged. When the torsion coil spring 124 is externally fitted to the outer peripheral surface of the preload pad 123, the lower outer peripheral surface 123f provided on the preload pad 123 is not provided on the inner periphery of the torsion coil 124.
- the central axis of the tapered inner peripheral surface 123b is offset to one side (the upper side in the figure) with respect to the central axis of the holder 122. For this reason, the holder 122 is housed in a state where the preload pad 123 and the torsion coil 124 are combined.
- the second tip 109B of the worm shaft 109a is inserted inside the tapered inner peripheral surface 123b provided on the preload pad 123 and fixed to a predetermined portion of the ging 101, the bottom provided on the preload pad 123
- the diameter of the torsion coil 124 is inertially expanded by the outer peripheral surface 123f.
- the torsion coil 124 is elastically restored in the direction of rewinding (reducing its diameter), so that the worm wheel 107 is given elastic force in the direction of force from the torsion coil 124 to the preload pad 123. It becomes. As a result, the distance between the output shaft 103 on which the worm wheel 107 is fitted and fixed and the rotation shaft 109a is reduced. As a result, the tooth surfaces of the worm 108 and the worm wheel 107 come into contact with each other with a preload applied.
- the preload is applied via the worm preload mechanism 120, so that the worm 108 and the worm wheel 107 are Since the backlash between the tooth surfaces is adjusted, it is possible to suppress the occurrence of rattle noise at the joints against the impact and vibration input by force such as wheels.
- the torsion bar 105 is twisted according to the force, and the relative rotation between the input shaft 102 and the output shaft 103 occurs. Motion occurs.
- the torque sensor 106 outputs a torque signal according to the direction and amount of the relative rotation. Based on a control map or the like set in advance from this torque signal and a vehicle speed signal from a sensor (not shown), the control circuit (not shown) generates a three-phase motor current corresponding to the rotor rotation angle detected by the resolver 222. Since the motor 109 is supplied, the motor 109 generates a desired auxiliary steering force.
- the torque generated by the rotating motor 109 is decelerated by the power transmission mechanism (108, 107) and transmitted to the output shaft 103, and supports the movement of the rack shaft 9 via the intermediate shaft 8.
- the steering mechanism is operated via the tie rod 13, and a wheel (not shown) can be steered.
- the motor coil 244 of the stator 221 in the brushless motor 109 is relatively By supplying a large motor current, a rotating magnetic field is generated and the rotating shaft 109a is driven to rotate.
- the motor driving current becomes a large current, the motor coil 244 generates heat.
- This heat generation is conducted to the motor housing body 223A through the split core 241 of the stator 221, and the motor housing body 223A is made of aluminum, aluminum alloy, magnesium, and magnesium alloy having a higher thermal conductivity than a normal steel motor housing.
- the heat generated by the motor coil 244 is effectively transferred to the housing 101 via the motor housing body 223A, and the motor 101
- the copper loss that the coil 244 can tolerate can be made larger than in the conventional example.
- the housing 101 and the motor housing main body 223A are manufactured by die casting using any one of aluminum, aluminum alloy, magnesium and magnesium alloy.
- the thickness is not limited as in the case of narrowing the thin steel plate as in the conventional example, and the specific gravity is about 1Z3 for the thin steel plate, so about 3% of the cylindrical part thickness of the conventional thin steel plate motor housing. Double the wall thickness.
- the aluminum alloy is a material having a thermal conductivity three times that of iron, and further provided with a stator tip butting portion 248 and filling the heat transfer body 249 between the coil ends, thereby reducing the copper loss.
- Heat from the coil end can be transferred to the motor housing body 223A via the stator tip abutting portion 248 and the heat transfer body 249. Due to these effects, a motor housing having the same weight as the conventional example can transfer more heat to the housing 101, so that the copper loss that can be tolerated by the motor coil 244 can be significantly larger than that of the conventional example. .
- the configuration is four times that of the most basic 2 pole 3 slot type.
- the magnetic pole force 257 and the stator 221 are configured to be 2n times as large as the basic configuration (n is an integer), so that the magnetic attractive force in the radial direction is canceled out, so that the rotor vibration during rotation can be reduced.
- the slot coefficient of this slot combination is “0.866”, and since it is a concentrated winding, there is an advantage that a large torque can be obtained against copper loss.
- the permanent magnet 259 serving as the magnetic pole is a segment magnet divided for each pole, and the shape thereof is formed in a saddle shape in which the arc center on the outer peripheral side is intentionally shifted from the rotation center. .
- the amount of change in the interlinkage magnetic flux can be converted into a sine wave, and the cogging torque and torque ripple when the sine wave is energized can be reduced.
- the fin-shaped rib is provided at a position where the resolver 222 is included, so that heat transfer by conduction, convection, and radiation to the atmosphere environment of this part is more than in the conventional example.
- the fixed side of the resolver 222 is affected by the heat generated by the copper loss of the motor coil 244, so that it is possible to prevent the resolver signal drift, accuracy degradation, and malfunction.
- the resolver 222 is disposed in the vicinity of the four-point contact ball bearing 112
- the resolver stator 222s and the resolver rotor 222r are caused by the difference in linear expansion coefficient between the motor housing material and the shaft material when the motor temperature changes. Can be prevented from shifting in the axial direction.
- the difference in linear expansion coefficient between the shaft material and the motor housing material is large as in this embodiment, the effect is remarkable.
- the permanent magnet 259 is covered with the cap 260 so that the permanent magnet 259 is chipped or cracked, or the permanent magnet 259 is peeled off from the rotor yoke 258, the permanent magnet 259 constituting the magnetic pole portion 257 is covered with the cap 260. Since permanent magnet 259 does not squeeze into the air gap, it is possible to reliably prevent wheel steering lock due to motor lock, which is a failure that should not occur in the electric power steering apparatus.
- the housing 101 is formed integrally with the motor housing body 223A of the motor housing 223, and surrounds the rotor yoke 258 and the stator yoke 242.
- the heat generated by the motor 109 is also transmitted through the housing 101 and released to the outside.
- the housing 101 and the motor housing 223 Compared to a separate unit, the heat transfer performance is significantly improved, and the cooling effect of the motor 109 is enhanced.
- the overall power steering apparatus can be reduced in size.
- the housing 101 is made of aluminum or magnesium, a greater effect of heat dissipation and light weight can be expected.
- the bearing 112 supporting the integral rotary shaft 109a at the rear part of the motor 109 is a four-point contact ball bearing, so a separate bearing preload device or the like is used.
- the bearing 112 can receive the axial force (both directions) without any interference, and since it is a four-point contact ball bearing, there is little play and the tooth surfaces of the worm 108 and the worm wheel 107 are properly meshed. Can do.
- FIG. 9 is a perspective view showing a housing that works on a modification.
- the pion housing 101 when the pion housing 101 is formed integrally with the motor housing body 223A, most of the force received by the worm 108 from the worm wheel 107 is the same as that of the axial car. Thus, it is transmitted to the motor housing lid 223B via the rotary shaft 109 and the four-point contact ball bearing 112.
- the motor housing cover 223B is bolted to the motor housing main body 223A, the axial is transmitted to the motor housing main body 223A via the bolt.
- the motor housing body 223A is thin for light weight or to improve heat dissipation, its strength may be a problem.
- the outer periphery of the motor housing main body 223A is extended in such a manner that the screw boss 223d for the fixing bolt is extended around the motor housing main body 223A. Since the triangular plate-like rib 223e connected to the surface is formed, the strength of the motor housing body 223A can be increased. In addition, the surface area of the motor housing body 223A can be increased by forming the rib 223e, and the size can be reduced. In addition, heat dissipation from the brushless motor can be promoted.
- the shape of the rib 223e is not limited to that shown in the drawing.
- FIG. 10 is a schematic view of a steering mechanism including a pinion type electric power steering apparatus 100 that can be applied to another embodiment.
- the embodiment shown in FIG. 10 differs from the embodiment shown in FIG. 1 only in that the electric power steering device 100 shown in FIGS. The explanation is omitted.
- the motor 109 is disposed in the large hole 101 c of the housing 101.
- the motor 109 includes a rotating shaft 109a, a rotor 109b disposed around the rotating shaft 109a, and a stator 109d provided on the inner periphery of the large hole 101c and facing the rotor 109b. A space between the large hole 10 lc and the rotating shaft 109a is sealed with a seal 109e.
- the large hole 101c is closed by a four-point contact bearing support holder 111 that constitutes a part of the housing 101 by being assembled to a motor frame 109F that is integral with the housing 101.
- a rotating shaft 109a is passed, and a rotation detector S for detecting the rotational speed of the four-point contact ball bearing 112 and the rotating shaft 109a is provided. It has been.
- One end (left end in FIG. 3) of the rotating shaft 109a of the motor 109 is supported by a four-point ball contact bearing 112 on a four-point contact bearing support holder 111.
- the torsion bar 105 is twisted according to the force, and the relative rotation between the input shaft 102 and the output shaft 103 occurs. Motion occurs.
- the torque sensor 106 outputs a torque signal according to the direction and amount of the relative rotation. Based on this torque signal and a vehicle speed signal from a sensor (not shown), a control circuit (not shown) transmits a drive signal to the motor 109, so that the motor 109 generates a desired auxiliary steering force.
- the torque generated by the profitable motor 109 is the power transmission It is decelerated by the structure (108, 107), transmitted to the output shaft 103, and supports the movement of the rack shaft 9 via the intermediate shaft 8.
- the steering mechanism operates via the tie rod 13 so that a wheel (not shown) can be steered.
- the housing 101 and the frame 109F of the motor 109 are integrated, the heat transfer property is remarkably improved, and the heat generated in the motor 109 can be efficiently radiated. Therefore, the motor 109 can be reduced in size and weight. If the housing 101 is made of aluminum or magnesium, the heat dissipation and light weight will be even greater.
- FIG. 10 is a schematic view of a steering mechanism including a pinion type electric power steering apparatus 100 that can be applied to another embodiment.
- the embodiment shown in FIG. 10 differs from the embodiment shown in FIG. 1 only in that the electric power steering device 100 shown in FIG. The description is omitted by giving the same reference numerals.
- the four-point contact bearing support holder 111 may be completely integrated with the housing 101.
- the rotating shaft of the electric motor can be supported without play while being compact.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/093,234 US20090266640A1 (en) | 2005-11-10 | 2006-11-09 | Electric power steering apparatus |
DE112006003088T DE112006003088T5 (de) | 2005-11-10 | 2006-11-09 | Elektrische Servolenkungs-Vorrichtung |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005325958A JP2007131144A (ja) | 2005-11-10 | 2005-11-10 | 電動式パワーステアリング装置 |
JP2005-325958 | 2005-11-10 | ||
JP2006-276171 | 2006-10-10 | ||
JP2006276171A JP2008094176A (ja) | 2006-10-10 | 2006-10-10 | 電動式パワーステアリング装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007055296A1 true WO2007055296A1 (ja) | 2007-05-18 |
Family
ID=38023295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/322402 WO2007055296A1 (ja) | 2005-11-10 | 2006-11-09 | 電動式パワーステアリング装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20090266640A1 (ja) |
DE (1) | DE112006003088T5 (ja) |
WO (1) | WO2007055296A1 (ja) |
Cited By (2)
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WO2009101788A1 (ja) * | 2008-02-12 | 2009-08-20 | Jtekt Corporation | 車両用操舵装置 |
JP2009190479A (ja) * | 2008-02-12 | 2009-08-27 | Jtekt Corp | 車両用操舵装置 |
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JP4512128B2 (ja) * | 2007-10-25 | 2010-07-28 | 本田技研工業株式会社 | モータの回転角検出装置 |
JP4866931B2 (ja) * | 2009-03-24 | 2012-02-01 | 日立オートモティブシステムズ株式会社 | パワーステアリング装置 |
GB0905294D0 (en) * | 2009-03-27 | 2009-05-13 | Trw Ltd | Gearbox assembly for electric power steering systems |
DE102009055396A1 (de) * | 2009-12-30 | 2011-07-07 | Robert Bosch GmbH, 70469 | Elektrischer Antrieb mit Schneckengetriebe |
CN102338197B (zh) * | 2010-07-20 | 2014-01-15 | 鸿富锦精密工业(深圳)有限公司 | 齿轮传动装置及具有该齿轮传动装置的机械手臂 |
DE102010049999A1 (de) * | 2010-10-29 | 2012-05-03 | Volkswagen Ag | Elektrische Lenkunterstützungsvorrichtung zur Anordnung an einer Lenksäule eines Kraftfahrzeugs |
US9595859B2 (en) * | 2012-03-29 | 2017-03-14 | Rakesh K. Dhawan | Multi-phase multi-pole electric machine |
US9233705B2 (en) * | 2011-10-18 | 2016-01-12 | Nsk Ltd. | Steering column support apparatus |
DE112013005511T5 (de) * | 2012-11-19 | 2016-01-28 | Honda Motor Co., Ltd. | Elektrische Servolenkvorrichtung |
JP5778123B2 (ja) * | 2012-12-25 | 2015-09-16 | 日立オートモティブシステムズステアリング株式会社 | パワーステアリング装置及びバックラッシュ調整機構 |
RU2640377C2 (ru) | 2013-03-29 | 2017-12-28 | Мицуба Корпорейшн | Бесщеточный двигатель стеклоочистителя |
DE102013107759B4 (de) | 2013-07-19 | 2018-05-03 | Trelleborgvibracoustic Gmbh | Schwingungstilger und Schwingungstilgeranordnung |
JP6129774B2 (ja) * | 2014-03-24 | 2017-05-17 | 株式会社ショーワ | パワーステアリング装置 |
US20170207684A1 (en) * | 2014-07-15 | 2017-07-20 | Mitsuba Corporation | Brushless wiper motor |
US10797561B2 (en) | 2014-07-15 | 2020-10-06 | Mitsuba Corporation | Brushless wiper motor |
US10843664B2 (en) | 2014-07-15 | 2020-11-24 | Mitsuba Corporation | Brushless wiper motor and method for assembling the same |
EP3035506A1 (en) * | 2014-12-16 | 2016-06-22 | Daf Trucks N.V. | Electro-mechanical power steering for application in heavy commercial vehicles |
US9744987B2 (en) * | 2015-04-29 | 2017-08-29 | Steering Solutions Ip Holding Corporation | Worm shaft subassembly |
US9739361B2 (en) * | 2015-09-29 | 2017-08-22 | Steering Solutions Ip Holding Corporation | Vehicle steering column assembly and method of assembling |
DE102016120356A1 (de) * | 2016-10-25 | 2018-04-26 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Antriebsvorrichtung |
US10807633B2 (en) * | 2017-05-12 | 2020-10-20 | Ka Group Ag | Electric power steering assembly and system with anti-rotation coupler |
WO2019082271A1 (ja) * | 2017-10-24 | 2019-05-02 | 日本精工株式会社 | 電動パワーステアリング装置 |
KR102427344B1 (ko) * | 2018-10-26 | 2022-07-29 | 현대모비스 주식회사 | 차량용 조향장치 |
JP7264717B2 (ja) * | 2019-05-15 | 2023-04-25 | ファナック株式会社 | ステータコアの端面に固定されるハウジングを備える電動機 |
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- 2006-11-09 US US12/093,234 patent/US20090266640A1/en not_active Abandoned
- 2006-11-09 DE DE112006003088T patent/DE112006003088T5/de not_active Withdrawn
- 2006-11-09 WO PCT/JP2006/322402 patent/WO2007055296A1/ja active Application Filing
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JP2000236652A (ja) * | 1999-02-13 | 2000-08-29 | Trw Lucasvarity Electric Steering Ltd | 電力支援ステアリング・システムに関する改良 |
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WO2009101788A1 (ja) * | 2008-02-12 | 2009-08-20 | Jtekt Corporation | 車両用操舵装置 |
JP2009190479A (ja) * | 2008-02-12 | 2009-08-27 | Jtekt Corp | 車両用操舵装置 |
US8408353B2 (en) | 2008-02-12 | 2013-04-02 | Jtekt Corporation | Vehicle steering apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE112006003088T5 (de) | 2008-09-25 |
US20090266640A1 (en) | 2009-10-29 |
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