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WO2019189102A1 - Unité de moyeu présentant une fonction de direction et véhicule équipé de cette dernière - Google Patents

Unité de moyeu présentant une fonction de direction et véhicule équipé de cette dernière Download PDF

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Publication number
WO2019189102A1
WO2019189102A1 PCT/JP2019/012727 JP2019012727W WO2019189102A1 WO 2019189102 A1 WO2019189102 A1 WO 2019189102A1 JP 2019012727 W JP2019012727 W JP 2019012727W WO 2019189102 A1 WO2019189102 A1 WO 2019189102A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
support member
steering
hub
unit support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/012727
Other languages
English (en)
Japanese (ja)
Inventor
佑介 大畑
聡 宇都宮
教雄 石原
大場　浩量
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Publication of WO2019189102A1 publication Critical patent/WO2019189102A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/18—Arrangement of bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • 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
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/18—Steering knuckles; King pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/20—Links, e.g. track rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

  • the present invention relates to a hub unit with a steering function having a function of performing left and right independent auxiliary steering in addition to steering by a steering device, and a vehicle including the same, and a steering shaft while ensuring rigidity of a knuckle or the like
  • the present invention relates to a technology for making a compact shape so as to fit in a tire wheel.
  • the vehicle geometry includes (1) “Parallel geometry” where the left and right wheels have the same turning angle, and (2) The turning inner wheel angle is turned larger than the turning outer wheel angle in order to make the turning center one place. Ackermann geometry is known.
  • the Ackermann geometry is the difference in rudder angle between the left and right wheels so that each wheel turns around a common point in order to smoothly turn the vehicle when turning at low speeds where the centrifugal force acting on the vehicle can be ignored. Is set. However, in high-speed turning where the centrifugal force cannot be ignored, it is desirable that the wheels generate a cornering force in a direction that balances with the centrifugal force. Therefore, the parallel geometry is preferable to the Ackermann geometry.
  • a general vehicle steering device is mechanically connected to a wheel, generally only a single fixed steering geometry can be taken, and an intermediate between the Ackermann geometry and the parallel geometry. Often set to static geometry. However, in this case, the difference in steering angle between the left and right wheels is insufficient in the low speed range, the steering angle of the outer wheel is excessive, and the steering angle of the inner wheel is excessive in the high speed range. If there is an unnecessary bias in the lateral force distribution of the inner and outer wheels in this way, it will cause a reduction in fuel consumption due to increased running resistance and premature tire wear, and the inner and outer wheels cannot be used efficiently. There is a problem that it is damaged.
  • Patent Document 1 has been proposed regarding a mechanism in which the steering geometry is variable depending on the driving situation.
  • Patent Document 1 two motors are used, and both the toe angle and the camber angle can be tilted to an arbitrary angle.
  • Patent Document 2 proposes a mechanism for four-wheel independent steering.
  • Patent Document 1 since two motors are used, not only the cost increases due to the increase in the number of motors, but also the control becomes complicated.
  • Patent Document 2 since the hub bearing is cantilevered with respect to the steered shaft, the rigidity is lowered, and the steering geometry may change due to the excessive traveling G.
  • a reduction gear is provided on the steered shaft, the size including the motor increases. When the size increases, it becomes difficult to arrange the entire wheel on the inner periphery. Moreover, when a reduction gear with a large reduction ratio is provided, the responsiveness decreases.
  • the conventional mechanism having an auxiliary steering function as described above is intended to arbitrarily change the toe angle or the camber angle of the wheel in the vehicle, and thus requires a plurality of motors and speed reduction mechanisms and has a complicated configuration. It has become. In addition, it is difficult to ensure rigidity, and it is necessary to increase the size and weight in order to ensure rigidity. Further, when the kingpin shaft and the turning shaft of the mechanism having an auxiliary steering function coincide with each other, since the component parts are arranged behind the hub unit (vehicle body side), the overall size increases and becomes heavy. .
  • the steered shaft and the steered shaft support bearing need to increase the rigidity and strength in order to support the load from the wheels, but if the size is increased to ensure the rigidity, the weight increases and the motion performance of the vehicle decreases. To do.
  • the steered shaft is placed outside the tire wheel, the distance from the center of the steered shaft to the center of the ground contact surface of the wheel becomes longer, more force is required to steer the wheel, and the actuator becomes larger, resulting in the entire hub unit. Will increase in weight.
  • An object of the present invention is to provide a hub unit with a steering function and a vehicle equipped with the hub unit that can make the entire hub unit a compact shape while ensuring the rigidity of a unit support member provided in a suspension frame part. It is.
  • a hub unit with a steering function includes a hub unit body having a hub bearing that supports a wheel and a steered shaft portion that protrudes up and down from the outer periphery of a fixed wheel of the hub bearing, and a suspension frame part of a suspension device And a unit support member that rotatably supports the hub unit body about the turning shaft center of the upper and lower steering shaft portions, and for steering the hub unit body to rotate around the turning shaft center.
  • An actuator, and the unit support member is provided integrally with or separately from the underbody frame component and supports the hub unit body in a state in which the hub unit main body can be assembled and detached while leaving a part of the steered shaft portion.
  • the rudder angle difference between the left and right wheels can be changed according to the running speed. For this reason, it becomes possible to improve the motion performance of the vehicle and to travel with high stability and reliability. Furthermore, by appropriately changing the steering angle of the left and right steering wheels, the turning radius of the vehicle in turning traveling can be reduced, and the small turning performance can be improved. Furthermore, even during straight running, by adjusting the amount of toe angle according to each scene, it is possible to make adjustments such as ensuring running stability at high speed without reducing fuel consumption at low speed.
  • the unit support member includes a unit support member main body that supports the hub unit main body in a state in which the hub unit main body can be assembled and detached, leaving a part of the steered shaft portion, and the unit support member main body coupled to the unit support member main body.
  • the turning shaft part extended in an up-down direction can be arrange
  • the steering actuator can be reduced in size, and the entire hub unit can be reduced in size and weight. Furthermore, by making the unit support member into a structure in which the unit support member main body and the unit support member combination are divided, the turning shaft part and the bearing supporting the turning shaft part can be enlarged, and the rigidity of the unit support member can be increased. Can be secured.
  • the upper and lower steered shafts may be supported by the unit support member via bearings, and the bearings may be located in the wheels of the wheels.
  • the distance from the center of the steered shaft part to the center of the ground contact surface of the wheel can be reliably shortened and the force for steering the wheel can be reduced as compared with the conventional structure in which the steered shaft part is arranged outside the tire wheel Can do. Therefore, the steering actuator can be reduced in size, and the entire hub unit can be reduced in size and weight. Thereby, the motion performance of the vehicle can be enhanced.
  • any one of the upper and lower turning shaft portions may be supported by the unit support member main body, and the other turning shaft portion may be supported by the unit support member combination.
  • the rigidity of the unit support member can be increased as compared with a structure in which the unit support member is divided by a plane including the turning axis.
  • the unit support member main body may be integrally provided with a support portion for supporting the upper turning shaft portion on the unit support member main body.
  • the load received when the tire rides on a step or the like directly acts on the unit support member main body, not a fastening part such as a bolt, via bearings that respectively support the upper and lower steered shaft portions. Therefore, the rigidity of the entire hub unit can be increased.
  • the unit support member main body is provided integrally with the underbody frame component, the rigidity of the unit support member can be further increased.
  • a steering system is a steering system including the hub unit with a steering function according to any one of the above configurations of the present invention, and a control device that controls a steering actuator of the hub unit with the steering function.
  • the apparatus includes an auxiliary steering control unit that outputs a current command signal corresponding to a given steering angle command signal, and a driving current that corresponds to the current command signal input from the auxiliary steering control unit to output the steering actuator And an actuator drive controller for controlling the drive of the actuator.
  • the auxiliary steering control unit outputs a current command signal corresponding to the given steering angle command signal.
  • the actuator drive control unit outputs a drive current corresponding to the current command signal input from the auxiliary steering control unit to drive-control the steering actuator. Therefore, it is possible to arbitrarily change the wheel angle in addition to steering by a driver's steering wheel operation or the like.
  • either or both of the front wheels and the rear wheels are supported by using the steering function-equipped hub unit having any one of the configurations of the present invention. Therefore, each effect mentioned above is acquired about the hub unit with a steering function of this invention.
  • the front wheels are generally steered wheels, but when the hub unit with a steering function of the present invention is applied to the steered wheels, it is effective for adjusting the toe angle during traveling.
  • the rear wheels are generally non-steered wheels, when applied to non-steered wheels, the minimum turning radius during low-speed traveling can be reduced by slightly steering the non-steered wheels.
  • FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. It is a perspective view which shows the unit support member of the hub unit with the same steering function. It is a disassembled perspective view which divides
  • FIG. 3 is an exploded front view showing the unit support member divided into a unit support member main body and a unit support member combined body.
  • FIG. 3 is an exploded front view showing the unit support member divided into a unit support member main body and a unit support member combined body.
  • FIG. 3 is an exploded side view showing the unit support member divided into a unit support member main body and a unit support member combined body.
  • FIG. 6 is a schematic plan view of another example of a vehicle including any one of the steering function-equipped hub units.
  • FIG. 10 is a schematic plan view of still another example of a vehicle including any one of the steering function-equipped hub units.
  • the hub unit 1 with a steering function includes a hub unit body 2, a unit support member 3, a rotation allowable support component 4, and a steering actuator 5.
  • the unit support member 3 is provided integrally with a knuckle 6 that is a suspension frame part.
  • An actuator body 7 of the steering actuator 5 is provided on the inboard side of the unit support member 3, and a hub unit body 2 is provided on the outboard side of the unit support member 3.
  • the vehicle width direction outer side of the vehicle is referred to as an outboard side
  • the vehicle width direction center side of the vehicle is referred to as an inboard side.
  • the hub unit main body 2 and the actuator main body 7 are connected by a joint portion 8.
  • the joint portion 8 is provided with a boot (not shown) for waterproofing and dustproofing.
  • the hub unit main body 2 is supported by the unit support member 3 via the rotation allowable support parts 4 and 4 at two upper and lower positions so as to be rotatable around the turning axis A extending in the vertical direction.
  • the turning axis A is an axis different from the rotation axis O of the wheel 9, and is different from the kingpin axis that performs main steering.
  • the kingpin angle is set at 10 to 20 degrees for the purpose of improving the straight running stability of the vehicle traveling.
  • the hub unit 1 with a steering function of this embodiment is different from the kingpin angle. It has a (shaft) steering shaft.
  • the wheel 9 includes a wheel 9a and a tire 9b.
  • the hub unit 1 with a steering function is added to the steering wheel, specifically, steering by the steering device 11 of the front wheel 9F of the vehicle 10 as shown in FIG.
  • the knuckle 6 of the suspension device 12 is integrally provided.
  • the steering device 11 is attached to the vehicle body, and is operated by an operation of the driver's handle 11 a, an automatic driving device (not shown), a command of a driving support device, or the like, and the tie rod 14 that moves forward and backward. Is coupled to a steering coupling portion 6 d (described later) of the unit support member 3.
  • the steering device 11 is a rack and pinion type or the like, but any type of steering device may be used.
  • the strut suspension mechanism that directly fixes the shock absorber to the knuckle 6 is applied to the suspension device 12, a multi-link suspension mechanism or other suspension mechanisms may be applied.
  • the hub unit main body 2 includes a hub bearing 15 for supporting the wheel 9, an outer ring 16, and an arm portion 17 (FIG. 3) that is a steering force receiving portion described later.
  • the hub bearing 15 includes an inner ring 18, an outer ring 19, and rolling elements 20 such as balls interposed between the inner and outer rings 18, 19. 1).
  • the hub bearing 15 is an angular ball bearing in which the outer ring 19 is a fixed ring, the inner ring 18 is a rotating ring, and the rolling elements 20 are in a double row.
  • the inner ring 18 includes a hub ring portion 18a having a hub flange 18aa and constituting a race surface on the outboard side, and an inner ring portion 18b constituting a race surface on the inboard side.
  • the wheel 9a of the wheel 9 is bolted to the hub flange 18aa so as to overlap the brake rotor 21a.
  • the inner ring 18 rotates around the rotation axis O.
  • the outer ring 16 includes an annular portion 16 a fitted to the outer peripheral surface of the outer ring 19, and a trunnion shaft-like steered shaft provided so as to protrude vertically from the outer periphery of the annular portion 16 a. Parts 16b and 16b.
  • the respective turning shaft portions 16b which are upper and lower mounting shaft portions are provided coaxially with the turning shaft center A.
  • the brake 21 has a brake rotor 21a and a brake caliper 21b.
  • the brake caliper 21b is mounted on two upper and lower brake caliper mounting portions 22 (FIG. 4) formed integrally with the outer ring 19 so as to project into an arm shape.
  • each rotation-allowing support component 4 is composed of a rolling bearing.
  • a tapered roller bearing is applied as the rolling bearing.
  • the rotation allowable support component 4 includes an inner ring 4a fitted to the outer periphery of the steered shaft portion 16b, an outer ring 4b fitted to the unit support member 3, and a plurality of rolling elements 4c interposed between the inner and outer rings 4a and 4b. And have.
  • the upper and lower steered shaft portions 16 b and 16 b are supported by the unit support member 3 via the rotation permission support parts 4 and 4, respectively, and each rotation permission support part 4 is inside the wheel 9 a of the wheel 9.
  • each rotation permission support component 4 is arranged in the middle of the wheel 9a in the width direction of the wheel 9a.
  • the unit support member 3 includes a unit support member main body 3A on the inboard side and a unit support member combination 3B on the outboard side.
  • the unit support member 3 is represented by oblique lines.
  • the unit support member main body 3A is provided integrally with the knuckle 6 and supports the hub unit main body 2 in a state in which the hub unit main body 2 can be assembled and removed while leaving a part of each steered shaft portion 16b.
  • the part of each steered shaft portion 16b is a substantially half portion in the circumferential direction of each steered shaft portion 16b. Partial semi-concave spherical fitting hole forming portions 3Aa are respectively formed in the upper and lower portions of the outboard side end of the unit support member main body 3A.
  • the unit support member assembly 3B is detachably coupled to the outboard side end of the unit support member main body 3A by a plurality (four in this example) of bolts 33.
  • the unit support member combination 3B is coupled to the unit support member main body 3A to support the remaining portion of each steered shaft portion 16b, and the hub unit main body 2 extends from the unit support member 3. Prevents withdrawal.
  • a partial semi-concave spherical fitting hole forming portion 3Ba is formed on each of the upper and lower portions of the side surface of the inboard side of the unit support member assembly 3B.
  • the unit support member assembly 3B is coupled to the outboard side end of the unit support member main body 3A, and the fitting hole forming portions 3Aa and 3Ba are combined with each other for each of the upper and lower portions, so that fitting holes connected to the entire circumference are formed. It is formed.
  • the outer ring 4b of the rotation-permitting support component 4 is fitted in this fitting hole.
  • Each turning shaft portion 16b in the outer ring 16 is formed with a female screw portion extending in the radial direction, and is provided with a bolt 23 that is screwed into the female screw portion.
  • a disc-like pressing member 24 is interposed on the end surface of the inner ring 4a, and a preload is applied to each rotation-allowing support component 4 by applying a pressing force to the end surface of the inner ring 4a by a bolt 23 that is screwed into the female screw portion. Giving. Thereby, the rigidity of each rotation permission support component 4 can be improved. Even when the weight of the vehicle acts on the hub unit, the initial preload is set so as not to be released.
  • the rolling bearing of the rotation-allowing support component 4 is not limited to the tapered roller bearing, and an angular ball bearing can be used depending on use conditions such as a maximum load. Even in that case, a preload can be applied in the same manner as described above.
  • the steering actuator 5 includes an actuator body 7 that rotates the hub unit body 2 about the turning axis A (FIG. 1). As shown in FIG. 2, the actuator body 7 converts a motor 26, a speed reducer 27 that decelerates the rotation of the motor 26, and a forward / reverse rotation output of the speed reducer 27 into a reciprocating linear motion of the linear motion output unit 25a. And a linear motion mechanism 25.
  • the motor 26 is, for example, a permanent magnet type synchronous motor, but may be a DC motor or an induction motor.
  • the reducer 27 may be omitted.
  • the reduction gear 27 can use a wrapping transmission mechanism such as a belt transmission mechanism or a gear train, and a belt transmission mechanism is used in the example of FIG.
  • the reducer 27 includes a drive pulley 27a, a driven pulley 27b, and a belt 27c.
  • a drive pulley 27 a is coupled to the motor shaft of the motor 26, and a driven pulley 27 b is provided in the linear motion mechanism 25.
  • the driven pulley 27b is disposed in parallel to the motor shaft.
  • the driving force of the motor 26 is transmitted from the drive pulley 27a to the driven pulley 27b via the belt 27c.
  • the drive pulley 27a, the driven pulley 27b, and the belt 27c constitute a winding-type speed reducer 27.
  • a feed screw mechanism such as a slide screw or a ball screw, a rack and pinion mechanism, or the like can be used.
  • a feed screw mechanism using a trapezoidal screw slide screw is used. Since the linear motion mechanism 25 includes a feed screw mechanism that uses a sliding screw of the trapezoidal screw, the effect of preventing reverse input from the tire 9b can be enhanced.
  • the actuator body 7 including the motor 26, the speed reducer 27, and the linear motion mechanism 25 is assembled as a semi-assembly and is detachably attached to the case 6b with bolts or the like. A mechanism that directly transmits the driving force of the motor 26 to the linear motion mechanism 25 without using a reduction gear is also possible.
  • the case 6b is integrally formed with the unit support member main body 3A as a part of the unit support member 3.
  • the case 6 b is formed in a bottomed cylindrical shape, and is provided with a motor housing portion that supports the motor 26 and a linear motion mechanism housing portion that supports the linear motion mechanism 25.
  • a fitting hole for supporting the motor 26 at a predetermined position in the case is formed in the motor housing portion.
  • the linear motion mechanism accommodating portion is formed with a fitting hole for supporting the linear motion mechanism 25 at a predetermined position in the case, a through hole for allowing the linear motion output portion 25a to advance and retreat.
  • the unit support member main body 3A includes the case 6b and a shock absorber mounting portion 6c that is a mounting portion of the shock absorber.
  • the unit support member main body 3A further includes a steering device coupling portion 6d serving as a coupling portion of the steering device 11 (FIG. 2).
  • the shock absorber mounting portion 6c and the steering device coupling portion 6d are also integrally formed with the unit support member main body 3A.
  • a shock absorber mounting portion 6c is formed on the upper portion of the outer surface portion of the unit support member main body 3A so as to protrude.
  • a steering device coupling portion 6d is formed on the side surface portion of the outer surface portion of the unit support member main body 3A so as to protrude.
  • the unit support member 3 includes the unit support member main body 3A that supports the hub unit main body 2 in a state in which the hub unit main body 2 can be assembled and detached while leaving a part of the steered shaft portion 16b.
  • the steering shaft part 16b extended to an up-down direction is used as the wheel 9. It can be arranged in the wheel 9a. Thereby, the distance from the center of the turning shaft portion 16b to the center of the ground contact surface of the wheel 9 is shortened, and the force for steering the wheel 9 can be reduced.
  • the steering actuator 5 can be reduced in size, and the entire hub unit can be reduced in size and weight. Furthermore, by making the unit support member 3 into a structure in which the unit support member main body 3A and the unit support member combined body 3B are divided, the turning allowable support component 4 that supports the turning shaft portion 16b and the turning shaft portion 16b is large-sized. The rigidity of the unit support member 3 can be ensured. Since the turning shaft portion 16b and the rotation-allowing support part 4 that supports the turning shaft portion 16b can be easily assembled even if the size thereof is increased, the rigidity of the knuckle 6 can be ensured.
  • the steered shaft portions 16b and 16b are supported by the unit support member 3 via the rotation-allowing support parts 4 and 4, respectively, and each rotation-allowing support part 4 is located in the wheel 9a of the wheel 9, the steered shaft
  • the distance from the center of the turning shaft portion 16b to the center of the ground contact surface of the wheel 9 can be reliably shortened and the force for steering the wheel 9 can be reduced as compared with the conventional structure in which the portion is disposed outside the tire wheel. Therefore, the steering actuator 5 can be reduced in size, and the entire hub unit can be reduced in size and weight. Thereby, the motion performance of the vehicle can be enhanced.
  • a steering function-equipped hub unit 1 according to a second embodiment will be described with reference to FIGS.
  • the upper turning shaft portion 16b of the upper and lower turning shaft portions 16b, 16b is supported by the unit support member main body 3A, and the lower turning shaft is provided.
  • the part 16b is supported by the unit support member combined body 3B.
  • a support portion 3Ab that supports the upper turning shaft portion 16b is provided integrally with the unit support member main body 3A.
  • the support portion 3Ab is provided at the upper end of the unit support member main body 3A on the outboard side.
  • the support portion 3Ab is formed with a fitting hole 3Ac for fitting the outer ring outer peripheral surface of the upper rotation-allowing support component 4.
  • the unit support member assembly 3B includes a substantially cylindrical tubular member 3Bb and a flange portion 3Bc extending outward in the radial direction from the outer peripheral surface of the tubular member 3Bb.
  • a plurality of bolts 35 can be screwed to the coupled portion 3Ad via the flange portion 3Bc of the unit support member coupled body 3B.
  • the rotation-allowing support component 4 and the pressing member 24 are bolted 23 from the Z direction. Assemble by fastening. Also in the second embodiment, the upper and lower steered shaft portions 16b and 16b are supported by the unit support member 3 via the rotation allowable support components 4 and 4, respectively, and each rotation allowable support component 4 is the wheel 9a of the wheel 9. (FIG. 1).
  • the upper turning shaft portion 16b is supported by the unit support member main body 3A, and the lower turning shaft portion 16b is supported by the unit support member combined body 3B.
  • the rigidity of the unit support member 3 can be increased compared to the structure in which the unit support member is divided by a plane including the turning axis as in the first embodiment.
  • the unit support member main body 3A is integrally provided with the unit support member main body 3A with the support portion 3Ab for supporting the upper turning shaft portion 16b, the load received when the tire rides on a step or the like is It acts directly on the unit support member main body 3A rather than a fastening part such as a bolt via bearings that respectively support the upper and lower steered shaft portions 16b and 16b. Therefore, the rigidity of the entire hub unit can be increased. In particular, when the unit support member main body 3A is provided integrally with the knuckle 6 which is a suspension frame part, the rigidity of the unit support member 3 can be further increased.
  • the lower turning shaft portion 16b may be supported by the unit support member body 3A, and the upper turning shaft portion 16b may be supported by the unit support member combination 3B.
  • a support portion that supports the lower turning shaft portion is provided integrally with the unit support member body, and the upper unit support member assembly is detachably configured with respect to the unit support member body.
  • the unit support member 3 may be configured separately from the underbody frame part, and the unit support member 3 may be detachably provided on the underbody frame part.
  • the hub unit 1 with a steering function may be used for non-steered wheels.
  • the suspension frame part 6 ⁇ / b> R serving as the wheel bearing installation portion of the suspension device 12 ⁇ / b> R that supports the rear wheel 9 ⁇ / b> R may be set and used for rear wheel steering.
  • the hub unit 1 with a steering function may be used for the left and right front wheels 9F and 9F as steering wheels and the left and right rear wheels 9R and 9R as non-steering wheels, respectively.
  • the steering system includes the hub unit 1 with a steering function according to any of the embodiments, and a control device 29 that controls the steering actuator 5 of the hub unit 1 with the steering function.
  • the control device 29 includes an auxiliary steering control unit 30 and an actuator drive control unit 31.
  • the auxiliary steering control unit 30 outputs a current command signal f corresponding to the auxiliary steering angle command signal (steering angle command signal) e given from the host control unit 32.
  • the upper control unit 32 is an upper control unit of the auxiliary steering control unit 30, and an electric control unit (Vehicle Control Unit, abbreviated as VCU) for controlling the entire vehicle is applied as the upper control unit 32, for example.
  • VCU Electric Control Unit
  • the actuator drive control unit 31 drives and controls the steering actuator 5 by outputting a drive current g corresponding to the current command signal f input from the auxiliary steering control unit 30.
  • the actuator drive control unit 31 controls the power supplied to the coil of the motor 26.
  • the actuator drive control unit 31 configures, for example, a half bridge circuit using a switch element (not shown), and performs PWM control for determining a motor applied voltage based on the ON-OFF duty ratio of the switch element.
  • SYMBOLS 1 Steering function hub unit, 2 ... Hub unit main body, 3 ... Unit support member, 3A ... Unit support member main body, 3Ab ... Support part, 3B ... Unit support member coupling body, 4 ... Rotation permission support component (bearing), 5 ... Steering actuator, 6 ... Knuckle (suspension frame component), 6R ... Suspension frame component, 9 ... Wheel, 9a ... Wheel, 9F ... Front wheel, 9R ... Rear wheel, 12, 12R ... Suspension device, 15 ... Hub Bearings, 16b ... steering shafts, 19 ... outer wheels (fixed wheels), 29 ... control devices, 30 ... auxiliary steering control units, 31 ... actuator drive control units

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
  • Power Steering Mechanism (AREA)
  • Body Structure For Vehicles (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

L'invention concerne une unité de moyeu présentant une fonction de direction telle qu'il est possible de rendre l'ensemble de l'unité de moyeu compact tout en garantissant la rigidité d'un élément de support d'unité disposé sur un composant de cadre de suspension. L'invention concerne également un véhicule équipé de l'unité de moyeu présentant une fonction de direction. Cette unité de moyeu (1) présentant une fonction de direction comprend : un corps d'unité de moyeu (2) qui présente un palier de moyeu (15) et des arbres tournants faisant saillie vers le haut et vers le bas ; un élément de support d'unité (3) qui supporte le corps d'unité de moyeu (2) en rotation autour de l'axe de rotation des arbres tournants supérieur et inférieur ; et un actionneur de direction (5). L'élément de support d'unité (3) est divisé en : un corps d'élément de support d'unité (3A) qui, à l'exclusion d'une partie des arbres tournants, supporte de manière amovible le corps d'unité de moyeu (2) ; et un corps accouplé d'élément de support d'unité (3B) qui est accouplé au corps d'élément de support d'unité (3A) de manière à supporter la partie restante des arbres tournants et empêche le corps d'unité de moyeu (2) de se détacher de l'élément de support d'unité (3).
PCT/JP2019/012727 2018-03-27 2019-03-26 Unité de moyeu présentant une fonction de direction et véhicule équipé de cette dernière Ceased WO2019189102A1 (fr)

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JP2018-059173 2018-03-27
JP2018059173A JP2019171911A (ja) 2018-03-27 2018-03-27 操舵機能付ハブユニットおよびこれを備えた車両

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WO2019189102A1 true WO2019189102A1 (fr) 2019-10-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021182312A1 (fr) * 2020-03-10 2021-09-16 Ntn株式会社 Unité moyeu présentant une fonction de direction et véhicule équipé de cette dernière

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08142895A (ja) * 1994-11-28 1996-06-04 Toyo Umpanki Co Ltd アクスル装置
DE102012206337A1 (de) * 2012-04-18 2013-10-24 Schaeffler Technologies AG & Co. KG Gelenkige Lagerung eines Radlagers zur Sturz- und/oder Spurverstellung
JP2014061744A (ja) * 2012-09-20 2014-04-10 Jtekt Corp 転舵装置および車両
JP2018024284A (ja) * 2016-08-08 2018-02-15 株式会社豊田中央研究所 ステアバイワイヤ式操舵装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08142895A (ja) * 1994-11-28 1996-06-04 Toyo Umpanki Co Ltd アクスル装置
DE102012206337A1 (de) * 2012-04-18 2013-10-24 Schaeffler Technologies AG & Co. KG Gelenkige Lagerung eines Radlagers zur Sturz- und/oder Spurverstellung
JP2014061744A (ja) * 2012-09-20 2014-04-10 Jtekt Corp 転舵装置および車両
JP2018024284A (ja) * 2016-08-08 2018-02-15 株式会社豊田中央研究所 ステアバイワイヤ式操舵装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021182312A1 (fr) * 2020-03-10 2021-09-16 Ntn株式会社 Unité moyeu présentant une fonction de direction et véhicule équipé de cette dernière
JP2021142767A (ja) * 2020-03-10 2021-09-24 Ntn株式会社 操舵機能付ハブユニットおよびこれを備えた車両
CN115243958A (zh) * 2020-03-10 2022-10-25 Ntn株式会社 带有操舵功能的轮毂单元和具有它的车辆
JP7320468B2 (ja) 2020-03-10 2023-08-03 Ntn株式会社 操舵機能付ハブユニットおよびこれを備えた車両
US11851123B2 (en) 2020-03-10 2023-12-26 Ntn Corporation Hub unit having steering function, and vehicle equipped with same

Also Published As

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