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WO2019054383A1 - Unité de moyeu présentant une fonction de direction auxiliaire et véhicule comprenant ladite unité de moyeu - Google Patents

Unité de moyeu présentant une fonction de direction auxiliaire et véhicule comprenant ladite unité de moyeu Download PDF

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Publication number
WO2019054383A1
WO2019054383A1 PCT/JP2018/033679 JP2018033679W WO2019054383A1 WO 2019054383 A1 WO2019054383 A1 WO 2019054383A1 JP 2018033679 W JP2018033679 W JP 2018033679W WO 2019054383 A1 WO2019054383 A1 WO 2019054383A1
Authority
WO
WIPO (PCT)
Prior art keywords
auxiliary steering
outer ring
auxiliary
steering
hub unit
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/JP2018/033679
Other languages
English (en)
Japanese (ja)
Inventor
佑介 大畑
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 WO2019054383A1 publication Critical patent/WO2019054383A1/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
    • B60B35/02—Dead axles, i.e. not transmitting torque
    • 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
    • B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
    • B62D7/08—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in a single plane transverse to the longitudinal centre line of the vehicle
    • B62D7/09—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in a single plane transverse to the longitudinal centre line of the vehicle characterised by means varying the ratio between the steering angles of the steered wheels
    • 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
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • 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
    • F16C35/067—Fixing them in a housing

Definitions

  • the present invention relates to a hub unit with an auxiliary steering function and a vehicle having a function of performing additional steering such as rear wheel steering and the like to be added to steering by a steering device, stability and safety of travelability. Related to the improvement of technology.
  • a steering wheel and a steering device are mechanically connected, and both ends of the steering device are connected to respective left and right wheels by tie rods. Therefore, the cut angle of the left and right wheels due to the movement of the steering wheel is determined by the initial setting.
  • Ackerman geometry is known.
  • Patent Documents 1 and 2 have been proposed as to a mechanism in which the steering geometry is variable according to the traveling situation.
  • the steering geometry is changed by relatively changing the knuckle arm and the joint position.
  • Patent Document 2 two motors are used, and it is possible to incline both the toe angle and the camber angle to an arbitrary angle.
  • Patent Document 3 proposes a four-wheel independent steering mechanism.
  • Ackerman geometry is the difference in steering angle between left and right wheels so that each wheel turns around a common point in order to make the wheels turn smoothly when turning at low speed where the centrifugal force acting on the vehicle can be ignored Is set.
  • Patent Document 1 the steering geometry is changed by relatively changing the positions of the knuckle arm and the joint, but a motor actuator that obtains such a large force that changes the geometry of the vehicle is used. Providing is very difficult due to space constraints. In addition, the change in tire angle due to the change at this position is small, and in order to obtain a large effect, it is necessary to make a large change, that is, a large movement.
  • Patent Document 2 since two motors are used, the cost increases due to the increase in the number of motors, and the control becomes complicated. Also, by using the constant velocity joint to support the wheel with a toe angle and a camber angle, the hub unit supporting the wheel becomes larger in the radial direction.
  • Patent Document 3 can be applied only to a four-wheel independent steered vehicle, and the hub bearing is supported in a cantilever manner with respect to the steered shaft, so the rigidity is reduced, and the occurrence of excessive travel G causes the steering geometry to be reduced. It may change.
  • Gazette Japanese Patent Application Laid-Open Nos. 2008-279600, 2008-282544, 2008-283231, 2008-281593. That is, in a hub unit that rotatably supports wheels of an automobile or the like, the hub bearing is rotatably supported about an auxiliary steering axis extending in the vertical direction, and the hub bearing is supported by the auxiliary steering actuator. Rotate around. As a result, the hub bearing can be freely rotated about the auxiliary steering axis, and independent steering of one wheel can be performed, and the toe angle of the tire can be arbitrarily changed according to the traveling condition of the vehicle. Can.
  • Each proposed hub unit with auxiliary steering function has a function to rotate the hub bearing around the auxiliary steering axis, so that the hub bearing, particularly the outer ring, has a complicated shape.
  • the hub bearing 3 and the outer ring 11 of a vehicle such as a general automobile have the shapes shown in FIGS. 14 and 15, the proposed hub bearing 3 and the outer ring 11 are shown in FIGS. It is a shape.
  • illustration of a rolling element is abbreviate
  • the outer ring 11 has a supported portion 19, an auxiliary steering force receiving portion 18, and a brake caliper mounting portion 36 which both project outward on the outer periphery.
  • the supported portions 19 are provided at upper and lower two places on the outer periphery of the outer ring 11, and are rotatably supported by an outer ring supporting member (not shown) installed on the vehicle body via a suspension device.
  • the auxiliary steering force receiving portion 18 is a portion that receives the force of the auxiliary steering actuator.
  • the brake caliper attachment portion 36 is attached with a brake caliper to be in contact with a brake rotor provided on the inner ring 12.
  • the object of the present invention is to perform auxiliary steering according to the traveling situation independently for the right and left wheels, improve the motion performance of the vehicle, and improve the stability and safety of traveling and the fuel consumption.
  • Another object of the present invention is to provide a hub unit with an auxiliary steering function and a vehicle provided with the same, which can be easily manufactured at low cost by machining the outer ring of the hub bearing.
  • the hub unit with auxiliary steering function of the present invention is A hub bearing having an inner ring which is a rotating ring to which the wheel is attached and an outer ring which is a fixed ring;
  • An outer ring supporting member installed on a vehicle body via a suspension device and rotatably supporting the outer ring of the hub bearing around an auxiliary turning shaft center extending in the vertical direction at two upper and lower positions through rotation permitting supporting parts;
  • Equipped with The outer ring of the hub bearing is A cylindrical outer ring main body in which a raceway groove of rolling elements is formed on the inner periphery,
  • An auxiliary steering member provided with a supported portion which is disposed on the outer peripheral side of the outer ring main body and supported rotatably around the auxiliary steering axis by the rotation-allowable support component;
  • Have The outer ring main body and the auxiliary turning member are separate parts and are coupled to each other.
  • the hub bearing that supports the wheels can be freely rotated about the auxiliary steered shaft center, so by applying a rotational force about the auxiliary steered shaft center to the outer ring of the hub bearing, Independent steering can be performed, and the toe angle of the tire can be arbitrarily changed according to the traveling condition of the vehicle.
  • the hub unit with the auxiliary steering function may be used as either a steered wheel such as a front wheel or a non-steered wheel such as a rear wheel.
  • a steered wheel such as a front wheel or a non-steered wheel such as a rear wheel.
  • the hub unit with the auxiliary steering function is used as a steered wheel, it is installed on a member whose direction can be changed by the steering device, thereby adding it to steering by the driver's steering wheel operation. Or it becomes a mechanism which makes a slight angle change of the tire interlocked with the left and right wheels. Since the tire angle can be arbitrarily changed independently of each other while traveling, it is possible to improve the motion performance of the vehicle and travel stably and safely. For example, it is possible to change the steering geometry while traveling, such as parallel geometry in high speed range turning and Ackerman geometry in low speed range. It is also possible to improve fuel consumption by setting an appropriate tire angle.
  • this hub unit with an auxiliary steering function is used as a non-steered rear
  • the hub unit with the auxiliary steering function performs rotatable support around the auxiliary steering axis at two upper and lower positions respectively by the rotation-allowable support parts, both ends are supported and rigidity is secured, and the configuration is simple. It is. In this way, auxiliary steering according to the traveling situation can be performed independently for the left and right wheels, improving the motion performance of the vehicle, improving traveling stability and safety, and improving fuel consumption, and also simple. And it has a solid structure.
  • the hub bearing Since the outer ring of the hub bearing is divided into the outer ring body and the auxiliary steered member, the hub bearing can be assembled easily. In addition, since the outer ring body is cylindrical, the center of gravity is located on or near the axis. Therefore, when processing the raceway groove on the inner periphery while rotating the outer ring main body, the rotation of the outer ring main body is stabilized, and the raceway groove can be processed with high accuracy. Although it is necessary to use relatively expensive materials such as SUJ2 and S53C for the outer ring body where accuracy of the raceway groove is required, for auxiliary steering members where accuracy is not required compared to the outer ring body, it is relatively inexpensive Materials can be used, which can lead to cost savings.
  • relatively expensive materials such as SUJ2 and S53C
  • the auxiliary steering axis may extend in the vertical direction.
  • the auxiliary steering axis may be any axis extending in the vertical direction, and may be slightly inclined. However, if it extends in the vertical direction, the change in the camber angle by the auxiliary steering is better suppressed. The increase in traveling resistance can be further suppressed.
  • the auxiliary turning axis extends in the vertical direction, it is easy to secure the arrangement area of the outer ring support member in the limited space of the tire house and the like.
  • the auxiliary steering member in the case of including an auxiliary steering actuator installed on the outer ring support member and rotating the hub bearing around the auxiliary steering axis, the auxiliary steering member is An auxiliary steering force receiving portion for receiving the force of the auxiliary steering actuator may be integrally provided on the outer periphery.
  • the auxiliary turning force receiving portion is integrally provided to the auxiliary turning member, the number of parts can be reduced as compared with the case where the auxiliary turning force receiving portion is a separate part from the auxiliary turning member.
  • the outer ring further has a brake caliper mounting member which is on the outer peripheral side of the outer ring main body and to which the brake caliper is attached, and the outer ring main body, the auxiliary steered member and the brake caliper mounting member are coupled to each other It may be done.
  • the outer ring of the hub bearing is divided into the outer ring body, the auxiliary steered member, and the brake caliper mounting member, assembly is more than in the case where the outer ring body and the auxiliary steered member are divided. improves.
  • the brake caliper mounting member can be made of a relatively inexpensive material, the cost can be reduced.
  • the front wheel and the rear wheel are supported using the hub unit with an auxiliary turning function according to any one of the above-described configurations of the present invention. Therefore, each effect mentioned above is acquired about the hub unit with an auxiliary steering function of this invention.
  • the front wheels are generally steered wheels, but when the hub unit with an auxiliary steering function of the present invention is applied to the steered wheels, it is effective for toe angle adjustment during traveling.
  • the rear wheels are generally non-steered wheels, when the hub unit with an auxiliary steering function of the present invention is applied to the non-steered wheels, some steering of the non-steered wheels will minimize The radius of rotation can be reduced.
  • FIG. 1 is a perspective view of a general steering hub of a vehicle without rolling elements. It is a perspective view of the outer ring of the steering hub.
  • FIG. 2 is a perspective view of the proposed steering hub with the rolling elements omitted. It is a perspective view of the outer ring of the steering hub.
  • FIG. 1 is a longitudinal sectional view showing the configuration of a hub unit with an auxiliary steering function according to an embodiment of the present invention and the periphery thereof
  • FIG. 2 is a horizontal sectional view of the same.
  • the hub unit with auxiliary steering function (hereinafter simply referred to as "hub unit") 1 is a hub bearing 3 for supporting the wheel 2, an outer ring support member 5, and an auxiliary steering.
  • Actuator 6 and a brake 14 (FIG. 2).
  • the hub unit 1 is added to the steered wheels in this embodiment, specifically, steered by the steering device 25 of the front wheels 2 F of the vehicle 10 as shown in FIG. It is a mechanism.
  • the hub unit 1 is installed on the knuckle 22.
  • the steering device 25 is a device that steers the front wheels 2 F and 2 F in response to an operation of a steering wheel (not shown).
  • the hub unit 1, In addition, may be used as a mechanism for steering the rear wheels 2 R as an adjunct to the front wheel steering.
  • the hub bearing 3 is an outer ring fixed / inner ring rotation type, the outer ring 11 is supported by the outer ring support member 5, and the wheel 2 is attached to the inner ring 12.
  • the wheel 2 is composed of a wheel 8 and a tire 9.
  • the hub bearing 3 is supported by the outer ring support member 5 at two upper and lower positions via rotation tolerant support parts 7 so as to be rotatable about an auxiliary turning shaft center A extending in the vertical direction.
  • the auxiliary steering axis A is an axis different from the rotational axis O of the wheel 2 and is also different from the kingpin axis K which performs the main steering.
  • the auxiliary turning axis A extends in the vertical direction, but is different from the kingpin axis K, for example, in the vertical direction.
  • the auxiliary steering axis A is the intersection position P K between the extension and the road surface S of the kingpin axis K
  • the intersection position P A of the extension line and the road surface S of the auxiliary steering axis A is Both are designed to be located in the tire contact surface 9a.
  • the "tire contact surface” refers to a place where the tire 9 is in contact with the road surface S in a state where one driver (equivalent to 55 kg) gets on the driver's seat.
  • the outer ring support member 5 is attached to the knuckle 22 of the suspension device 21 installed on the vehicle body 10A (see FIG. 13).
  • the outer ring support member 5 may be provided integrally with the knuckle 22, that is, as a part of the knuckle 22.
  • the suspension device 21 is a double wishbone type in this example, and has an upper arm 23 and a lower arm 24 connected via a shock absorber (not shown), and between the upper arm 23 and the tip of the lower arm 24
  • the knuckle 22 is installed so as to be rotatable around an inclined king pin axis K.
  • the suspension device 21 may adopt other various types such as an independent suspension type.
  • the knuckle 22 has a steering device connecting portion 22a protruding like an arm as shown in FIG.
  • a steering device connecting portion 22 a of the knuckle 22 is rotatably connected to a tie rod 26 of the steering device 25.
  • FIG. 3 is a longitudinal sectional view of the hub unit with auxiliary steering function
  • FIG. 4 is an external perspective view of the hub unit with auxiliary steering function
  • FIG. 5 is a left side view of the hub unit with auxiliary steering function.
  • the hub bearing 3 is composed of an inner ring 12, an outer ring 11, and rolling elements 13 such as balls interposed between the inner and outer rings. A member on the vehicle body side and the wheel 2 are connected by the hub bearing 3.
  • the hub bearing 3 is an angular ball bearing in which the rolling elements 13 are double-rowed in the illustrated example.
  • the inner ring 12 has two rows of raceway grooves 12a of the rolling element 13 formed on the outer periphery, and has a hub flange 12b at the outboard end. As shown in FIG. 2, the wheel 8 of the wheel 2 is bolted to the hub flange 12b so as to overlap the brake rotor 14a described later. The inner ring 12 rotates about the rotation axis O.
  • the brake 14 has a brake rotor 14 a provided on the inner ring 12 and a brake caliper 14 b provided on the outer ring 11.
  • the brake 14 brakes the rotation of the inner race 12 and the wheel 2 by bringing the brake caliper 14 b into contact with the brake rotor 14 a provided on the hub flange 12 b of the inner race 12.
  • the brake caliper 14 is attached to a later described brake caliper attachment portion 36 provided on the outer ring 11.
  • FIG. 6 is a perspective view of the hub bearing with the rolling elements omitted
  • FIG. 7 is a perspective view of the outer ring of the hub bearing.
  • the outer ring 11 is supported by two support portions 19A and 19B at upper and lower positions rotatably supported around the auxiliary steering axis A by the rotation allowing support parts 7 and 7, respectively.
  • the supported portions 19A and 19B in this embodiment are trunnion shafts that protrude outward.
  • a male screw portion 19a is formed at the tip.
  • a screw hole 19b (FIG. 3) extending in the axial direction is formed in the tip end surface.
  • each rotation allowing support component 7 is a tapered roller bearing, and the inner ring 15 is fitted on the outer periphery of the supported portion 19A (or 19B), and the outer ring 16 is provided on the outer ring support member 5 It is fitted in the hole 38.
  • the inner ring 15 is pressed in the axial direction by a nut 39 which is screwed to the male screw 19a of the supported portion 19A.
  • the lower end of the outer ring 16 is supported by the bolt 42 in which the pressing member 41 is fitted in the fitting hole 38 of the outer ring support member 5 and screwed into the screw hole 19 b of the supported portion 19B. Is pressing.
  • the pressing by the nut 39 and the bolt 42 applies a pre-load to the upper and lower rotation allowing support parts 7 formed of tapered roller bearings.
  • the outer ring support member 5 is divided into one outer ring support member main member 5 a and an outer ring support member divided body 5 b provided for each of the rotation allowing support parts 7 and 7, and they are mutually connected by bolts 44. .
  • wheel support member 5 of upper and lower rotation permission support components 7 and 7 may mutually be the same structure.
  • the fixing structure of the tolerant support part 7 may be applied to the fixing of the upper rotation tolerant support part 7.
  • the outer wheel 11 has an auxiliary steering force receiving portion 18 receiving the force of the auxiliary steering actuator 6, and a brake caliper attachment portion to which the brake caliper 14 is attached. And 36 on the outer periphery.
  • the auxiliary steering force receiving portion 18 is a portion serving as an application point for applying the auxiliary steering force to the outer ring 11 of the hub bearing 3, and is provided as an arm portion integrally projecting on a part of the outer periphery of the outer ring 11.
  • the auxiliary steering force receiving portion 18 is rotatably connected to the direct drive output portion 6a of the auxiliary steering actuator 6 via a joint 57 as will be described later with reference to FIG. Thereby, the hub bearing 3 is rotated around the auxiliary axis A, that is, the auxiliary steering is performed by the linear motion output unit 6a of the auxiliary steering actuator 6 advancing and retracting.
  • the auxiliary steering actuator 6 includes a motor 27, a reduction gear 28 for decelerating the rotation of the motor 27, and forward and reverse rotational output of the reduction gear 28 of the direct movement output unit 6 a. It is comprised by the linear_motion
  • the motor 27 is, for example, a permanent magnet type synchronous motor, but may be a direct current motor or an induction motor.
  • a winding type transmission mechanism such as a belt transmission mechanism or a gear train can be used. In the example of FIG. 2, a belt transmission mechanism is used.
  • the linear movement mechanism 29 can be a feed screw mechanism such as a slide screw or a ball screw, or a rack and pinion mechanism, and in this example, a feed screw mechanism using a slide screw of a trapezoidal screw is used.
  • a mechanism is also possible that transmits the driving force of the motor 27 directly to the linear motion mechanism 29 without via the reduction gear.
  • FIG. 9 shows a state in which the main steering is in a straight-ahead state and the auxiliary steering is performed inward
  • FIG. 10 shows a state in which the main steering is directed to the left and the auxiliary steering is performed inward.
  • the stopper 35 is provided, for example, on the surface of the outer ring support member 5 that faces the hub bearing 3 in the axial direction, for example, the surface that faces the end face of the outer ring 11 of the hub bearing 3.
  • the angle ⁇ of auxiliary steering of the hub bearing 3 is regulated.
  • the allowable range of the auxiliary steerable angle of the hub bearing 3 may be a slight angle, and the allowable range of the auxiliary steerable angle by the stopper 35 is, for example, ⁇ 5 degrees or less.
  • the outer ring 11 of the hub bearing 3 is composed of an outer ring main body 61 which is a separate member, an auxiliary turning member 62 and a brake caliper mounting member 63.
  • the outer ring main body 61 is a member in which the above-mentioned raceway groove 11a is formed on the inner circumference, and has a substantially cylindrical shape.
  • the outer peripheral surface of the outer ring main body 61 is composed of a large diameter outer peripheral surface portion 61a which occupies most of the axial direction and a small diameter outer peripheral surface portion 61b located at one axial end.
  • coupling projections 61c are provided at equal locations in the circumferential direction at a plurality of locations (for example, 4 locations) of the large diameter outer peripheral surface portion 61a.
  • the coupling protrusion 61c has a bolt insertion hole 61d penetrating in the axial direction.
  • the outer ring main body 61 is cylindrical, and since the plurality of coupling projections 61c are at equal positions, the center of gravity is located on or near the axis. Therefore, when processing the raceway groove 11a on the inner periphery while rotating the outer ring main body 61, the rotation of the outer ring main body 61 is stable, and the raceway groove 11a can be processed with high accuracy. Since the outer ring body 61 is required to have the accuracy of the raceway groove 11a, a relatively expensive material such as SU material or S53C is used.
  • the auxiliary steering member 62 is an annular member fitted to the large diameter outer peripheral surface portion 61 a of the outer ring main body 61.
  • the trunnion shaft-shaped supported portions 19A and 19B are provided at two upper and lower positions on the outer peripheral surface of the auxiliary turning member 62, and the arm-shaped auxiliary turning force receiving portion 18 is integrated with one side of the outer peripheral surface.
  • a plurality of notches 62a into which the coupling projections 61c of the outer ring main body 61 can be fitted are provided on one end side of the auxiliary turning member 62 in the axial direction.
  • a portion axially adjacent to the notched portion 62a is a convex portion 62b protruding to the outer diameter side, and an axial screw hole 62c is provided in the convex portion 62b. Since the auxiliary steering member 62 does not require accuracy as compared with the outer ring main body 61, a relatively inexpensive material is used.
  • the brake caliper mounting member 63 is an annular member fitted to the small diameter outer peripheral surface portion 61 b of the outer ring main body 61.
  • the brake caliper mounting member 63 has the brake caliper mounting portion 36 on one side of the outer periphery. In a plurality of locations corresponding to the bolt insertion holes 61 d of the outer ring main body 61 in the brake caliper mounting member 63, bolt insertion holes 63 a penetrating in the axial direction are formed.
  • the brake caliper mounting member 63 does not require accuracy as compared with the outer ring main body 61, and therefore, a relatively inexpensive material can be used.
  • the outer ring 11 of the hub bearing 3 is assembled as follows.
  • the auxiliary steering member 62 is fitted to the large diameter outer peripheral surface portion 61 a of the outer ring main body 61.
  • the coupling projection 61c of the outer ring main body 61 is fitted into the notch 62a of the auxiliary turning member 62, and the outer ring main body 61 and the auxiliary turning member 62 are positioned in the circumferential direction.
  • the brake caliper mounting member 63 is fitted to the small diameter outer peripheral surface portion 61 b of the outer ring main body 61 from the side opposite to the auxiliary steering member 62 in the axial direction.
  • the axial centers of the bolt insertion holes 61 d and 63 a of the outer ring main body 61 and the brake caliper mounting member 63 are made to coincide with each other.
  • the brake caliper mounting member 63 abuts on the coupling projection 61 c of the outer ring main body 61 and the end surface of the auxiliary steering member 62.
  • the coupling bolt 64 is inserted in order of the bolt insertion hole 63a of the brake caliper mounting member 63 and the bolt insertion hole 61d of the outer ring main body 61, and the screw portion 64a is screwed into the screw hole 62c of the auxiliary steering member 62.
  • the outer ring main body 61, the auxiliary turning member 62, and the brake caliper mounting member 63 are combined and integrated with each other.
  • the hub unit 1 is rotatable about the auxiliary steered axis A with respect to the outer ring support member 5 provided with the hub bearing 3 in the knuckle 22 (FIG. 1).
  • the hub bearing 3 can be rotated by applying a force to the arm-like auxiliary steering force receiving portion 18 (FIG. 2).
  • the hub bearing 3 is an auxiliary connected to the direct drive output unit 6 a by advancing and retracting the direct drive output unit 6 a (FIG. 2) of the auxiliary steering actuator 6 installed on the outer ring support member 5 by driving the motor 27. It is rotated via the turning force receiving unit 18.
  • the rotation of the hub bearing 3 is added to the turning by the driver's steering wheel operation, that is, added to the rotation of the knuckle 22 about the king pin axis K (FIG. 1) by the steering device 25 (see FIG. 13). It is done as a basic steering. Further, independent rotation of one wheel can be performed by the rotation of the hub bearing 3.
  • the toe angles between the left and right wheels 2 and 2 can be arbitrarily changed by making the auxiliary steering angles of the left and right wheels 2 and 2 different.
  • the tire angle can be arbitrarily changed independently of each other during traveling, so that the exercise performance of the vehicle 10 can be improved to travel stably and safely. It becomes possible. It is also possible to improve fuel consumption by setting an appropriate tire angle.
  • the hub unit 1 in the case of using the wheels 2 R after a non-steering wheels, it is possible to reduce the minimum turning radius during low-speed running.
  • the hub unit 1 of this embodiment can control the left and right wheels 2 individually, the steering angle of the wheels 2, that is, the turning angle is changed according to the vehicle speed and the turning G, and Ackerman geometry (each wheel Increase travel resistance by arbitrarily selecting the steering angle difference between the left and right wheels so that they turn about a common point) and parallel geometry (the steering angles of the left and right wheels are the same) in the high-speed range It is possible to achieve both smooth turnability at low speed and cornering performance at high speed.
  • the auxiliary steering axis A may be any axis extending in the vertical direction, and may be inclined to some extent, but in this embodiment extends in the vertical direction, and the change of the camper angle by the auxiliary steering Can be better suppressed, and the increase in running resistance can be further suppressed.
  • the kingpin axis K and the auxiliary steering axis A coincide with each other, if the hub bearing 3 is steered with the kingpin axis K as an auxiliary steering wheel, the camber angle largely changes and the traveling resistance increases.
  • the auxiliary turning axis A separately from the kingpin axis K, it is possible to suppress the change in the camber angle due to the auxiliary turning and to suppress the increase in the running resistance.
  • the kingpin axis K and the auxiliary steered axis A coincide with each other, the component parts are disposed on the vehicle side of the hub bearing 3 and the overall size becomes heavy, but the auxiliary steered axis A In a direction different from the kingpin axis K of the suspension device 21, the size of the entire device can be reduced and the weight can be reduced.
  • the intersecting point P K between the extension and the road surface S of the kingpin axis K of the suspension system 21, the intersection position P A of the extension line and the road surface of the auxiliary steering axis A are both positioned within the tire ground contact surface 9a Therefore, both the main steering and the auxiliary steering can be performed stably and efficiently.
  • the kingpin axis K and the auxiliary steering axis A are different, if the extension of both axes and the contact position of the tire 9 are different, slippage occurs if both move at the same time, which is inefficient and Behavior may be disturbed.
  • the intersecting point P K between the extension and the road surface S of the kingpin axis K, the intersection P A between the extension line and the road surface S of the auxiliary steering axis A is arranged close to each other.
  • the two points P A and P K coincide with each other, so that even if the main steering and the auxiliary steering are simultaneously performed, slip does not occur and the main steering and the main steering efficiently.
  • Auxiliary steering can be performed, and the vehicle can be operated stably.
  • auxiliary steering With regard to the angle of auxiliary steering, a slight angle is sufficient to improve the motion performance of the vehicle and the stability and safety of traveling, and it is sufficient even if the auxiliary steerable angle is ⁇ 5 degrees or less.
  • the angle of the auxiliary steering is controlled by the control of the auxiliary steering actuator 6, since the stopper 35 is provided and regulated, even if the hub unit 1 breaks down due to a failure of the power supply system, It is prevented that a big influence arises. Therefore, the vehicle can be brought to a safe place by steering operation.
  • the rotation allowing support component 7 is formed of a tapered roller bearing, a preload can be applied between the inner ring 15 and the outer ring 16 by tightening or the like at the time of attachment, and rigidity can be enhanced.
  • the rotation tolerant support part 7 may use an angular contact ball bearing or a four-point contact ball bearing instead of the tapered roller bearing.
  • the rotation allowing support component 7 may be a spherical slide bearing such as a spherical bush, a pivot bearing or the like. Also in this case, preload can be applied as described above.
  • the hub bearing 3 Since the outer ring 11 of the hub bearing 3 is divided into the outer ring body 61, the auxiliary steering member 62, and the brake caliper mounting member 63, the hub bearing 3 can be assembled easily. Further, since the outer ring body 61 is cylindrical and the plurality of coupling projections 61c are at equal positions, the rotation of the outer ring body 61 is stable when the raceway groove 11a is processed on the inner periphery while the outer ring body 61 is rotated. Thus, the raceway groove 11a can be machined with high accuracy.
  • the auxiliary steering member 62 and the brake which do not require accuracy as compared with the outer ring main body 61
  • a relatively inexpensive material can be used for the caliper attachment member 63, whereby the cost can be reduced.
  • the auxiliary steering force receiver 18 is provided integrally with the auxiliary steering member 62, but it is possible to transmit the force of the auxiliary steering actuator 6 to the auxiliary steering member 62.
  • the auxiliary steering force receiving portion 18 may be a separate member from the auxiliary steering member 62.
  • the outer ring 11 is divided into the outer ring main body 61, the auxiliary steering member 62, and the brake caliper mounting member 63 in this embodiment, the auxiliary steering member 62 and the brake caliper mounting member 63 are integrated. May be
  • FIG. 11 shows a specific example of the auxiliary steering actuator 6.
  • the driving force of the motor 27 is transmitted to the drive pulley 51 coupled to the motor shaft 27a, and is transmitted by the belt 53 to a driven pulley 52 disposed parallel to the motor shaft 27a.
  • the pulleys 51 and 52 and the belt 53 constitute a winding type reduction gear 28.
  • the screw shaft 54 in the linear motion mechanism 29 which is a feed screw mechanism is disposed in a screwing manner on the nut 55 on the inner periphery of the driven pulley 52.
  • the nut 55 and the screw shaft 54 have a thread groove and a screw thread constituting a screw portion 58 of a slide screw, specifically, a trapezoidal screw having a self-locking function.
  • the rotation of the nut 55 which rotates integrally with the driven pulley 52, causes the screw shaft 54 to move in a linear motion back and forth because the screw shaft 54 is detentated by the detent portion 56.
  • An arm-like auxiliary steering force receiving portion 18 provided on the outer ring 11 of the hub bearing 3 is connected to the direct acting output portion 6 a at the tip of the screw shaft 54 via a joint 57.
  • the joint 57 is rotatably connected to the auxiliary steering force receiving portion 18 and the direct acting output portion 6 a by two pins 57 a.
  • the hub bearing 3 can rotate around the auxiliary steered shaft center A with respect to the outer ring support member 5 by the forward and backward movement of the screw shaft 54.
  • the driven pulley 52 and the nut 55 of the linear motion mechanism 29 are separately manufactured, they are combined, but the driven pulley 52 and the nut 55 are integrally manufactured with each other. It may be part of another part.
  • FIG. 12 shows another specific example of the auxiliary steering actuator 6.
  • the driving force of the motor 27 is transmitted to a drive gear 59 coupled to the motor shaft 27a, and is transmitted to a driven gear 60 disposed parallel to the motor shaft 27a.
  • the drive gear 59 and the driven gear 60 constitute a gear train serving as the reduction gear 28.
  • the screw shaft 54 of the linear movement mechanism 29 including a feed screw mechanism is screwed to a nut 55A provided at the center of the driven gear 60.
  • the configuration of the linear movement mechanism 29 and the connection between the linear movement mechanism 29 and the hub bearing 3 are the same as in the example shown in FIG. That is, the nut 55A and the screw portion 58 of the screw shaft 54 are slide screws, and more specifically, are trapezoidal screws having a self-locking function.
  • the rotation of the nut 55A which rotates integrally with the driven pulley 52, causes the screw shaft 54 to move in a linear motion back and forth because the screw shaft 54 is locked by the locking portion 56.
  • An arm-like auxiliary steering force receiving portion 18 provided on the outer ring 11 of the hub bearing 3 is connected to the direct acting output portion 6 a at the tip of the screw shaft 54 via a joint 57.
  • the joint 57 is rotatably connected to the auxiliary steering force receiving portion 18 and the direct acting output portion 6 a by two pins 57 a.
  • the hub bearing 3 can rotate around the auxiliary steered shaft center A with respect to the outer ring support member 5 by the forward and backward movement of the screw shaft 54.
  • the driven gear 60 and the nut 55A of the linear movement mechanism 29 are integrally manufactured, the driven gear 60 and the nut 55A are integrally manufactured and mutually coupled. It may be one.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Rolling Contact Bearings (AREA)
  • Power Steering Mechanism (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)

Abstract

L'invention concerne une unité de moyeu (1) présentant une fonction de direction auxiliaire comprenant : un roulement de moyeu (3) qui comprend un chemin de roulement interne (12) qui est un chemin de roulement rotatif auquel une roue est fixée et un chemin de roulement externe (11) qui est un chemin de roulement fixe ; et un élément de support de chemin de roulement externe (5) qui soutient le chemin de roulement externe (11), un élément de support permettant la rotation (7) étant interposé entre eux, au niveau de chacun de deux emplacements verticalement de manière à permettre la rotation autour d'un centre d'arbre de direction auxiliaire s'étendant verticalement A. Le chemin de roulement externe (11) comprend : un corps de chemin de roulement externe cylindrique (61) qui comprend une rainure de chemin de roulement (11a) pour un élément roulant formé sur la circonférence interne ; et un élément de direction auxiliaire (62) doté de parties soutenues (19A, 19B) qui sont soutenues de manière à pouvoir tourner autour du centre d'arbre de direction auxiliaire (A) sur des éléments de support permettant la rotation au niveau du côté de circonférence externe du corps de chemin de roulement externe (61). Le corps de chemin de roulement externe (61) et l'élément de direction auxiliaire (62) sont des éléments séparés qui sont joints l'un à l'autre.
PCT/JP2018/033679 2017-09-15 2018-09-11 Unité de moyeu présentant une fonction de direction auxiliaire et véhicule comprenant ladite unité de moyeu Ceased WO2019054383A1 (fr)

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Application Number Priority Date Filing Date Title
JP2017-177741 2017-09-15
JP2017177741A JP2019051846A (ja) 2017-09-15 2017-09-15 補助転舵機能付ハブユニットおよびそれを備えた車両

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112078356A (zh) * 2020-08-28 2020-12-15 北京特种机械研究所 一种agv用舵轮小角度摆动驱动转向桥

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63162313A (ja) * 1986-12-26 1988-07-05 Honda Motor Co Ltd 自動車のサスペンシヨン装置
JPH01190586A (ja) * 1988-01-27 1989-07-31 Koyo Seiko Co Ltd 車輪用軸受装置
JP2008274993A (ja) * 2007-04-25 2008-11-13 Nsk Ltd 車輪支持用軸受ユニット
EP2060416A1 (fr) * 2007-11-16 2009-05-20 Audi AG Dispositif de réglage pour suspensions de roues

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63162313A (ja) * 1986-12-26 1988-07-05 Honda Motor Co Ltd 自動車のサスペンシヨン装置
JPH01190586A (ja) * 1988-01-27 1989-07-31 Koyo Seiko Co Ltd 車輪用軸受装置
JP2008274993A (ja) * 2007-04-25 2008-11-13 Nsk Ltd 車輪支持用軸受ユニット
EP2060416A1 (fr) * 2007-11-16 2009-05-20 Audi AG Dispositif de réglage pour suspensions de roues

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112078356A (zh) * 2020-08-28 2020-12-15 北京特种机械研究所 一种agv用舵轮小角度摆动驱动转向桥

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