CN103671740A

CN103671740A - Wheel driving device

Info

Publication number: CN103671740A
Application number: CN201310263202.0A
Authority: CN
Inventors: 细野寿一; 岛袋淳一
Original assignee: Samsung Electro Mechanics Japan Advanced Technology Co Ltd
Current assignee: Samsung Electro Mechanics Japan Advanced Technology Co Ltd
Priority date: 2012-09-26
Filing date: 2013-06-27
Publication date: 2014-03-26
Also published as: JP2014065396A

Abstract

The invention provides a wheel driving device capable of reducing the noise thereof. The wheel driving device (10) is used for driving a wheel hub (12) to rotate relative to a shaft (20). The wheel driving device (10) comprises a stator (70) fixed to the shaft (20), a rotor (30) driven to rotate around the shaft (20) based on the magnetic interaction of the stator (70) with the rotor (30), and a transmission mechanism used for transmitting the rotating torque of the rotor (30) to the wheel hub (12). The transmission mechanism is composed of a sun gear (34) used for supporting the rotation of the rotor (30) and capable of rotating around the shaft (20); a planetary gear set engaged with the sun gear (34); and an internal gear (38) fixed to the wheel hub (12) and engaged with the planetary gear set. The wheel driving device (10) further comprises a planetary supporting part (87) capable of freely and rotatably supporting the planetary gear (36) of the planetary gear set. The planetary supporting part (87) is mounted onto the shaft (20) via a one-way clutch (32).

Description

Wheel driver

Technical field

The present invention relates to make the wheel hub of wheel with respect to the wheel driver of axle rotation.

Background technique

In the past, as making one of driving source of Vehicle Driving Cycle, used wheel hub motor (In-wheel motor).Become the vehicle of applicable object of wheel hub motor such as being the scooter (scooter) of electric bicycle, electric wheelchair, translator, electronic chassis, golf cart etc.

For example in patent documentation 1, record the wheel driver of (In-Hub) type in wheel hub, it is at the wheel hub Nei Neibao of wheel motor, and its driving force is situated between and by transfer mechanism, is rotarilyd actuate the wheel hub of wheel.In this drive unit, first the rotary driving force of the rotor of motor rotarilys actuate sun gear.Then, by the rotation of sun gear, 3 planetary pinions that are engaged with are driven in rotation.By planetary rotation, the swivel plate that is provided with the internal gear being engaged with is driven in rotation.And then the rotary driving force of swivel plate is situated between and is rotarilyd actuate wheel hub by overrunning clutch.

(formerly technical paper)

(patent documentation)

(patent documentation 1) TOHKEMY 2009-12627 communique

Summary of the invention

(inventing problem to be solved)

In wheel hub, in the wheel driver of type, in course of action, at inner, gear, rotate engagingly, therefore can produce noise.Such noise may on be equipped with wheel driver vehicle feel by bus to bring bad impact.

The present invention designs in view of such situation, and its object is to provide a kind of wheel driver that can noise decrease.

(for solving the means of problem)

A scheme of the present invention relates to wheel driver.This wheel driver be a kind of wheel hub that makes wheel with respect to the wheel driver of axle rotation, comprising: the stator that is fixed on axle; Rotor based on rotating in the surrounding of axle with the magnetic interaction of stator; And the transfer mechanism that the torque of wanting to make rotor is transmitted from rotor to wheel hub.Transfer mechanism comprises: the rotation of bear rotor, the sun gear rotating in the surrounding of axle; Planetary gear set with sun gear engagement; And be fixed on wheel hub, with the internal gear of planetary gear set engagement.This wheel driver also comprises the planetary planet support unit can free rotary ground supporting planetary gear set comprising.Planet support unit is situated between and is installed in axle by overrunning clutch.

According to this scheme, can make sun gear with respect to axle rotation or suppress such rotation by applying the method for torque.

In addition, the mode of execution by the combination in any of above constituting component, constituting component of the present invention and the form of expression after mutually converting between method, device, system etc., is also effective as technological scheme of the present invention.

(invention effect)

By the present invention, can reduce the noise of wheel driver.

Accompanying drawing explanation

Fig. 1 is the enlarged view of wheel part of vehicle that has been suitable for the wheel driver of the 1st mode of execution.

Fig. 2 is the sectional drawing of the wheel driver of Fig. 1.

(a) of Fig. 3～(f) is the schematic diagram of the axle of presentation graphs 2 in more detail.

Fig. 4 means the chart of other measurement result of noise level when power moves and while dallying.

Fig. 5 is the sectional drawing of the wheel driver of the 2nd mode of execution.

Fig. 6 is the planimetric map of the wiring part that arranges on electric machine casing.

Embodiment

Below, to each constituting component, parts identical or that be equal to shown in the drawings, give identical label, and suitably the repetitive description thereof will be omitted.In addition, the size of the parts in each accompanying drawing is suitably amplified for ease of understanding, is dwindled to represent.And, the expression of having omitted a part of parts not too important aspect explanation mode of execution in each accompanying drawing.

(the 1st mode of execution)

The wheel driver of the 1st mode of execution is by motor, to be rotarilyd actuate the wheel driver of type in the wheel hub of wheel of vehicle.The wheel hub motor that this wheel driver also can be used as the rotation of wheel of four-wheel wagons such as automotive bicycle, tricycle, wheelchair, automobile such as the electric unicycle that makes with power-assisted, bicycle etc. is used.

The wheel driver of the 1st mode of execution has interaction based on magnetic and counterrotating stator and rotor and wanting from rotor to wheel hub transmission makes the transfer mechanism of the torque of rotor.Transfer mechanism comprises planetary gear set, and this planetary gear set is supported by planet bearing.Planet bearing is situated between and by overrunning clutch, is installed in axle, and when power moves, planet bearing is fixed with respect to axle, and when idle running, planet bearing rotates with respect to axle.Thus, the noise in the time of reducing to dally.

Fig. 1 is the enlarged view of wheel part of vehicle that has been suitable for the wheel driver 10 of the 1st mode of execution.Wheel driver 10 makes the wheel hub 12 of wheel with respect to axle 20 rotations.Axle 20 forms by cutting carbon steel.In the present embodiment, wheel driver 10 comprises wheel hub 12, but in other embodiments, the wheel driver that does not comprise wheel hub is also fine.At the peripheral part of wheel hub 12, be fixed with the distolateral of a plurality of spokes 14 that radiation wire extends.In addition, on the distolateral wheel rim 18 that is fixed on supporting tire portion 16 of another of spoke 14.Wheel rim 18 is situated between and is engaged with wheel hub 12 by spoke 14, forms the skeleton of wheel.

Axle 20 is two side-prominent along the axial rotary wheel hub 12 of wheel hub 12, and its outstanding part is used as fork 22 supportings of a part of the vehicle frame of vehicle.Thus, comprise wheel hub 12, spoke 14, tire portion 16, and the wheel of wheel rim 18 rotates centered by axle 20.

In addition, in the example of Fig. 1, represented to comprise wheel hub 12, spoke 14, tire portion 16, and wheel rim 18, what is called has spoke wheel (spoke wheel), but also can be to for example replace the technological thought of the applicable present embodiment of so-called plate wheel (disk wheel) of spoke 14 with plectane.

Fig. 2 is the sectional drawing of wheel driver 10.Wheel driver 10 comprises wheel hub 12, rotor 30, transfer mechanism, stator 70, wiring part 52, lead-out wiring 54 and planet support unit 87.

Stator 70 is fixed on axle 20.Stator 70 comprises winding 40, core 42, electric machine casing 44.

Electric machine casing 44 is parts of the roughly cup-shaped of support core 42.Core 42 be supported in electric machine casing 44 planetary gear set side (below using the planetary gear set side group when electric machine casing 44 is watched as upside) above 44c.At electric machine casing 44, be provided with the axis hole 44a centered by the running shaft R of wheel hub 12.Axle 20 is inserted into axis hole 44a, and by being pressed into or being bondingly fixed on this, thus, electric machine casing 44 is fixing with respect to axle 20.

Core 42 is fixed on the outer circumferential side of electric machine casing 44 by a plurality of screws.Core 42 is to form by the slim electromagnetic steel plate of lamination.12 prominent utmost points that core 42 has annulus portion and extends internally along radial direction from annulus portion.Each prominent extremely upper winding 40 that is wound around of core 42.While flowing through the driving current of interchange in this winding 40, along the prominent utmost point, produce flux.

Wiring part 52 is the printed base plates that are screwed 44d below electric machine casing 44.Wiring part 52 has Hall element 52a, and this Hall element 52a is inserted into the Hall element hole 44h as penetration hole set on electric machine casing 44, and is exposed to the upside of electric machine casing 44.Hall element 52a is the flux (being the position of rotor 30) that detects magnet 63, and output is for determining the element of position detection signal on the energising opportunity (timing) of driving current.Hall element 52a is situated between and is connected with lead-out wiring 54 by wiring part 52, by lead-out wiring 54, position detection signal is sent to outside.

Specifically, the pin of Hall element 52a is for example by welding the pad 52d that is connected to wiring part 52.In addition, lead-out wiring 54 is for example connected to by welding the pad 52e that pad 52d is electrically connected to.

The winding terminal 40a of winding 40 is drawn through set penetration hole 52b on the wire guide 44e as penetration hole set on electric machine casing 44 and wiring part 52, is connected with lead-out wiring 54.By lead-out wiring 54, from outside to winding 40, provide electric power.The set penetration hole 52b of wiring part 52 is less than wire guide 44e, and these holes are roughly formed with one heart.In this situation, even if winding terminal 40a moves in the set penetration hole 52b of wiring part 52, also can prevent the contacting of side of winding terminal 40a and wire guide 44e.For preventing the contacting of side of winding terminal 40a and wire guide 44e, can insulating element be set in the side of wire guide 44e.Wiring part 52, between the attachment portion and electric machine casing 44 of winding terminal 40a and lead-out wiring 54, prevents contacting of this attachment portion and electric machine casing 44.The attachment portion of winding terminal 40a and lead-out wiring 54 can cover with insulating element.The attachment portion of winding terminal 40a and lead-out wiring 54 is such as being fixed in wiring part 52 by welding, the link tool such as bonding.

Fig. 6 is the planimetric map of wiring part 52 set on the electric machine casing 44 of the 1st mode of execution.The front end of winding terminal 40a stretches out predetermined overhang from the opposite side of figure to this side.At the front end of the winding terminal 40a stretching out, be wound around the front end that is welded with lead-out wiring 54.The penetration hole 52b that the winding terminal 40a of wiring part 52 passes is located at the position of distance of overhang of being longer than the front end of winding terminal 40a apart from conductor fig (pattern) 52c of the normal electric portion (live part) that should be used as on wiring part 52.Even if in the situation that the front end bending of winding terminal 40a also can prevent the front end of winding terminal 40a and contacting of conductor fig.

Return to Fig. 2, on electric machine casing 44, than the 2nd ball bearing 76(aftermentioned) more by ground, radial direction outside, form the 1st penetration hole 44f.On the side face of the axis hole 44a of electric machine casing 44, form the 2nd penetration hole 44g.On the side face of axle 20, form the 2nd side face opening 20b corresponding with the 2nd penetration hole 44g, that be communicated with the 2nd penetration hole 44g.

The 1st shaft portion 56 that axle 20 comprises downside and the 2nd shaft portion 57 of upside.The 1st shaft portion 56 and the 2nd shaft portion 57 are in the interior side engagement of wheel hub 12.On the side face of the 1st shaft portion 56, form the 1st side face opening 20a.The 1st side face opening 20a and the 2nd side face opening 20b are communicated in axle 20 by the axle center hole 20c arranging along running shaft R.

Axle center hole 20c is the hole forming from the lower end surface 56a of the 1st shaft portion 56 along running shaft R.That is, the 1st shaft portion 56 forms hollow at least in part.In this situation, can make axle 20 lightweights, and thermal diffusivity also improves.Axle 20 from wheel hub 12 the 2nd side-prominent shaft portion 57 that makes progress, do not form such hollow portion.In this situation, can improve the rigidity of the 2nd shaft portion 57.

The 2nd side face opening 20b, axle center hole 20c and the 1st side face opening 20a form the access 72 that is formed at axle 20.Access 72 makes the upside of electric machine casing 44 be communicated with the outside of wheel hub 12.

Lead-out wiring 54 is drawn to upside from the downside of electric machine casing 44 by the 1st penetration hole 44f, and by the 2nd penetration hole 44g access 72 that leads.Lead-out wiring 54, through access 72, is drawn out to the outside of wheel hub 12 from the 1st side face opening 20a.Lead-out wiring 54 is drawn from the 1st side face opening 20a along fork 22 ground.In the situation that fork 22 is formed hollow, lead-out wiring 54 also can be from the 1st side face opening 20a in the guiding of the inner side of fork 22.In this case, lead-out wiring 54 can be protected more effectively, and the overall width of vehicle can be reduced.Certainly, lead-out wiring 54 also can be through fork 22.

Rotor 30 by the magnetic interaction with stator 70 in surrounding's rotation of axle 20.Rotor 30 comprises 62,10 magnets 63 of rotor core and rotor retainer 66.Axle 20 runs through rotor 30, and can free rotary ground supporting it.

10 magnets 63 are along the circumferential direction equally spaced embedded in rotor core 62.Rotor core 62 forms by lamination silicon steel plate, relative along radial direction with 12 prominent utmost points of core 42.

Rotor retainer 66 is the parts that make rotor core 62 and sun gear 34 mechanical connections.Rotor retainer 66 rings enclose axle 20.The 3rd ball bearing 78 and the 7th ball bearing 92 are between rotor retainer 66 and axle 20, and axle 20 is situated between can free rotary ground supporting rotor retainer 66 by the 3rd ball bearing 78 and the 7th ball bearing 92.

The rotor protuberance 66b that rotor retainer 66 has the embedding part 66a of chimeric fixed rotor core 62 and makes progress side-prominent from embedding part 66a.Embedding part 66a is clipped by the 3rd ball bearing 78 and rotor core 62 on radial direction.The 7th ball bearing 92 is between rotor protuberance 66b and axle 20.

Embedding part 66a has the rotor core holding part 66c of the inner peripheral surface 62a that is crimped rotor core 62, and is arranged on than the relative 66d of portion of the rotor core of the top side of rotor core holding part 66c.The relative 66d of portion of rotor core forms the larger footpath than rotor core holding part 66c.The relative 66d of portion of rotor core is relative on axle direction above with rotor core 62.Especially, a part above for the relative 66d of portion of rotor core and rotor core 62 is joined.

When rotor core 62 is installed on to rotor retainer 66, rotor core 62 is inserted to rotor core holding part 66c from downside, and be pressed into fixing.Rotor core 62 is pressed into, until rotor core 62 touch above the relative 66d of portion of rotor core.That is stopper when, the relative 66d of portion of rotor core is as insertion rotor core 62 plays a role.Thus, compare with the situation that rotor core is inserted from upside, at the downside of rotor retainer, such stopper is set and can reduces rotor retainer side-prominent degree downwards.Its result, can obtain the space of wirings such as being more used for lead-out wiring 54, wiring part 52, Hall element 52a, element.The more close electric machine casing 44 of rotor retainer 66 can also be made, the slimming of wheel driver 10 can be contributed to.In addition, rotor core 62 can be adhesively fixed with rotor core holding part 66c, replace be pressed into fixing.

Transfer mechanism makes the torque of rotor 30 rotations transmit to wheel hub 12 from rotor 30 by wanting.Transfer mechanism comprises sun gear 34, the planetary gear set consisting of 3 planetary pinions 36 and internal gear 38.

Sun gear 34 for example engages with rotor protuberance 66b by parallel latching 33.The rotation of sun gear 34 bear rotor 30, in surrounding's rotation of axle 20.Sun gear 34 is to be situated between by encircling with gap the external gear that encloses axle 20.That is, axle 20 runs through sun gear 34, and can free rotary ground supporting it.

3 planetary pinions 36 are by fact uniformly-spaced, axle 20 is located at around in 120 degree compartment of terrains.Planetary pinion 36 is meshed with sun gear 34.Planetary pinion 36 has the 2nd train of gearings 36b that the 1st train of gearings 36a, pitch diameter are different from the 1st train of gearings 36a.The 1st train of gearings 36a and the 2nd train of gearings 36b are arranged in fact coaxially.The 1st train of gearings 36a is meshed with sun gear 34, and the 2nd train of gearings 36b is meshed with internal gear 38.The 1st train of gearings 36a and the 2nd train of gearings 36b are formed one, and rotation simultaneously.

The pitch ratio internal gear 38 of sun gear 34 is little, and sun gear 34 is arranged on than internal gear 38 more by axle direction downside, therefore the pitch diameter of the pitch ratio of the 1st train of gearings 36a the 2nd train of gearings 36b is large, and the 1st train of gearings 36a is set to the side on the lower than the 2nd train of gearings 36b on axle direction.

Planet support unit 87 can 3 planetary pinions 36 of free rotary ground supporting.Planet support unit 87 is situated between and is installed in axle 20 by the overrunning clutch 32 of voussoir (sprag) formula or cam (cam) formula and the 4th ball bearing 80.Planet support unit 87 comprises 3 planet pins 88, the 1st planet bearing 60 and the 2nd planet bearing 46.

Planet pin 88 runs through corresponding planetary pinion 36, is situated between by the 5th ball bearing 82 arranging separately on axle direction each other and the 6th ball bearing 84 and can free rotary ground supporting planetary pinion 36.The 2nd planet bearing 46 is fixed in the lower end of planet pin 88, the 1st planet bearing 60 is fixed in upper end.In this situation, planet pin 88 is by two end supports, therefore impact resistance improves.

The 1st planet bearing 60 is three places on adjacent planet pin 88 medium line each other in a circumferential direction, have joint 60a between the bearing engaging with the 2nd planet bearing 46.In this situation, by directly, mechanically engaging the 1st planet bearing 60 and the 2nd planet bearing 46, can make the intensity of transfer mechanism and precision improve.

The 1st planet bearing 60 is situated between and by overrunning clutch 32, is installed on the 2nd shaft portion 57.The 2nd planet bearing 46 is situated between and is installed on rotor protuberance 66b by the 4th ball bearing 80.The 4th ball bearing 80 rings enclose the 7th ball bearing 92.Therefore, rotor protuberance 66b is clipped by the 4th ball bearing 80 and the 7th ball bearing 92 on radial direction.

Overrunning clutch 32 is constituted as: torque by the pattern of transmitting from rotor 30 to wheel hub 12, at the electric current that drives use, flow through winding 40 and stator 70 magnetic while driving the power operation of rotors 30, planet support unit 87 is fixed in fact with respect to axle 20, when the pattern from wheel hub 12 to planetary gear set transmitting torque is wheel spin, planet support unit 87 is rotatable with respect to axle 20.Especially, overrunning clutch 32 can carry out circumferencial direction the 1st towards rotation, and restriction and the 1st the towards the opposite the 2nd towards rotation.The 1st towards be set to when idle running put on the 1st planet bearing 60 torque towards, the 2nd towards be set to when power moves, put on the 1st planet bearing 60 torque towards.

Internal gear 38 is fixed on the inner circumferential side of wheel hub 12 by screw.

Wheel hub 12 comprises that Jie can rotate freely by the 1st ball bearing 74 the 1st cover portion 26 that is installed on axle 20, and Jie can rotate freely by the 2nd ball bearing 76 the 2nd cover portion 28 that is installed on axle 20.The 1st ball bearing 74 is set to than the more top side of overrunning clutch 32.

The 1st cover portion 26 engages with the 2nd cover portion 28 by screw.In the anastomosis part of the 1st cover portion 26 and the 2nd cover portion 28, be subjected to the water-proofing treating based on O ring 50.

The 1st cover portion 26 has roughly sheath portion 26a cylindraceous and by the 1st ball bearing 74, is installed in cup (cup) 26b of portion of axle 20 with being situated between.The 26b of cup portion is formed and makes to depict protruding upward curved surface.The 26b of cup portion forms the wheel hub recess 94 that ring encloses the 1st ball bearing 74.Especially, the existence range of the 1st ball bearing 74 on axle direction and the existence range of the wheel hub recess 94 on axle direction have common ground.A part for the 1st planet bearing 60, particularly enter into wheel hub recess 94 with the anastomosis part of planet pin 88.

(a) of Fig. 3～(f) is the schematic diagram that represents in more detail axle 20.(a) of Fig. 3 represents the lower end surface 56a of the 1st shaft portion 56, (b) of Fig. 3 is the profile of the 1st shaft portion 56, (c) of Fig. 3 represents the upper-end surface 56b of the 1st shaft portion 56, (d) of Fig. 3 represents the lower end surface 57a of the 2nd shaft portion 57, (e) of Fig. 3 is the profile of the 2nd shaft portion 57, and (f) of Fig. 3 represents the upper-end surface 57b of the 2nd shaft portion 57.

The upper end portion of the underpart of the 1st shaft portion 56 and the 2nd shaft portion 57 is formed respectively the non-rotating symmetry of relative rotation axi R.Especially, in the underpart of the 1st shaft portion 56, be formed with 1D and cut shape (D カット) 96a.In the upper end portion of the 2nd shaft portion 57, be formed with 2D and cut shape 96b.The corresponding axis hole (not shown) that fork 22 was inserted, was fixed on to mode that D that shape 96a is aligned in axis hole cuts shape is cut with 1D in the underpart of the 1st shaft portion 56.Upper end portion about the 2nd shaft portion 57 is also the same.

It is fixed that the D at fork 22 axis hole place cuts the position of shape, thus need to make 1D cut shape 96a and 2D cut shape 96b position alignment it.That is, 1D cuts shape 96a and 2D, and to cut shape 96b be not arbitrarily in running shaft R relative angular position around, but have suitable angular orientation.The anastomosis part of the 1st shaft portion 56 and the 2nd shaft portion 57 is constituted as impels the form that realizes so suitable angular orientation.

More particularly, in the upper end portion of the 1st shaft portion 56, formation is cut with 1D the 3D that shape 96a is corresponding and is cut shape 96c.1D cuts the angular orientation of shape 96a and aligns with the angular orientation that 3D cuts shape 96c.Especially, it is identical in fact with the angular orientation that 3D cuts shape 96c that 1D cuts the angular orientation of shape 96a.

At the lower end surface 57a of the 2nd shaft portion 57, be formed with axle conjugate foramen 57c.At axle conjugate foramen 57c, be formed with and cut with 2D the 4D that shape 96b is corresponding and cut shape 96d.2D cuts the angular orientation of shape 96b and angular orientation that 4D cuts shape 96d aligns.Especially, it is identical in fact with the angular orientation that 4D cuts shape 96d that 2D cuts the angular orientation of shape 96b.

The upper end portion of the 1st shaft portion 56 is cut shape 96c and 4D with 3D and is cut the mode that shape 96d aligns and be inserted into, be fixed on axle conjugate foramen 57c.Its result, 1D cuts the angular orientation of shape 96a and aligns with the angular orientation that 2D cuts shape 96b.Thus, can make to comprise that the assembling of vehicle of wheel driver 10 is easier, can enhance productivity.

The action of the wheel driver 10 forming is as described above described.When power moves, by lead-out wiring 54, the driving current of three-phase is provided for winding 40.Along with this driving current flows through winding 40, along 12 prominent utmost points, produce flux.By this flux, magnet 63 is endowed torque.Transfer mechanism makes the torque of rotor 30 rotations transmit to wheel hub 12 from rotor 30 by wanting.Thus, wheel is just wanted with respect to axle 20 rotations.Critical piece with respect to axle 20 rotation when power moves is rotor 30, sun gear 34, internal gear 38 and wheel hub 12, planet support unit 87 because of the effect of overrunning clutch 32 fixing with respect to axle 20.Planetary pinion 36 is in surrounding's rotation of planet pin 88.

When idle running, torque is situated between and to planetary pinion 36, is transmitted from wheel hub 12 by internal gear 38, and because of the effect of overrunning clutch 32, the planet support unit 87 that comprises planetary pinion 36 is in surrounding's rotation of axle 20.Planetary pinion 36 is in surrounding's rotation of planet pin 88.Sun gear 34 and rotor 30 keep in fact static with respect to axle 20.

According to the wheel driver 10 of present embodiment, because of the effect of overrunning clutch 32, when power moves, torque is transmitted to wheel hub 12 from rotor 30, and when idle running, the rotation with respect to axle 20 of sun gear 34 is suppressed.Therefore, can reduce the noise that produces from wheel driver 10 in when idle running.Its result, can improve the sensation by bus of taking the vehicle that possesses wheel driver 10.

Fig. 4 means the chart of other measurement result of noise level when power moves and while dallying.The rank of the noise that wheel driver was produced rotating with respect to axle from sun gear when the solid line representing with label 200 of Fig. 4 is illustrated in idle running.The solid line representing with label 202 of Fig. 4 represents from the rank of the noise of wheel driver 10 generations of present embodiment.When power moves, both represent the noise rank of same degree, but known when idle running, the wheel driver 10 of present embodiment is evident as low noise.

In addition, in the wheel driver 10 of present embodiment, planet pin 88 is by 2 supportings, and the 1st planet bearing 60 that supports its upper end is situated between and is installed in axle 20 by overrunning clutch 32, and the 2nd planet bearing 46 that supports its lower end is situated between and is installed in rotor 30 by the 4th ball bearing 80.Therefore, can improve the bearing strength of planet pin 88.And planet support unit 87 is also supported by overrunning clutch 32 and the 4th ball bearing 80, therefore can improve the running accuracy of planet support unit 87, can improve the reliability of the action of overrunning clutch 32.

In addition,, in the situation that overrunning clutch being set between planetary pinion and planet support unit, need to overrunning clutch be set respectively for planetary pinion.Therefore, need to the overrunning clutch of equal number at least in planetary pinion number.Unlike this, in the wheel driver 10 of present embodiment, make overrunning clutch 32 between planet support unit 87 and axle 20, therefore overrunning clutch 32 is one.Therefore, by the wheel driver 10 of present embodiment, can reduce the quantity of required overrunning clutch, reduce costs.

In addition,, in the wheel driver 10 of present embodiment, the anastomosis part with planet pin 88 of the 1st planet bearing 60 enters into wheel hub recess 94.In addition, the 4th ball bearing 80 rings enclose the 7th ball bearing 92.According to these, can make wheel driver 10 thinner on axle direction.In an example, the axial thickness of wheel hub 12 is 95mm left and right.Its result, can be housed in wheel driver 10 in narrower space, and the designability that possesses the vehicle of wheel driver 10 improves.

In addition, the wheel driver 10 of present embodiment, by the 3rd ball bearing the 78, the 4th ball bearing 80 and the 7th ball bearing 92, keeps sun gear 34 near wheel driver 10 center.Therefore, can improve the precision of the rotation of sun gear 34.

(the 2nd mode of execution)

Fig. 5 is the sectional drawing of the wheel driver 210 of the 2nd mode of execution.Wheel driver 210 comprises wheel hub 12, rotor 230, transfer mechanism, stator 270, wiring part 52, lead-out wiring 54 and planet bearing 260.

Stator 270 is fixed on axle 220.Stator 270 comprises winding 40, core 42, the 1st housing 244 and the 2nd housing 246.

The 1st housing 244 is parts of the roughly cup-shaped of support core 42, fixing with respect to axle 220.Core 42 is supported on the 244c above of the 1st housing 244.

It is relative with the 1st housing 244 that the 2nd housing 246 clips core 42 ground on axle direction.The outer circumferential side of the 2nd housing 246 is fixed on the 1st housing 244.

The winding terminal 40a of winding 40 is drawn through set penetration hole 52b on the wire guide 244e as penetration hole set on the 1st housing 244 and wiring part 52, is connected with lead-out wiring 54.By lead-out wiring 54, from outside to winding 40, supply with electric power.The relation of the front end of winding terminal 40a and wiring part 52 and lead-out wiring 54 is in accordance with the corresponding relation of the 1st mode of execution illustrating with reference to Fig. 6.In addition, the penetration hole 52b of wiring part 52 and the relation of wire guide 244e are in accordance with the relation of penetration hole 52b and the wire guide 44e of the 1st mode of execution.

On the 1st housing 244, than the 2nd ball bearing 76, lean on radial direction outside and form the 1st penetration hole 244f.On the side face of the axis hole of the 1st housing 244, form the 2nd penetration hole 244g.On the side face of axle 220, form the 2nd side face opening 220b corresponding with the 2nd penetration hole 244g, that be communicated with the 2nd penetration hole 244g.Under axle 220 side-prominent from wheel hub 12, on the side face of protuberance, form the 1st side face opening 220a downwards.The 1st side face opening 220a and the 2nd side face opening 220b by along running shaft R be located at axle 220 axle center hole 220c be communicated with.

The 2nd side face opening 220b, axle center hole 220c and the 1st side face opening 220a form the access 272 that is formed at axle 220.Access 272 makes the upside of the 1st housing 244 be communicated with the outside of wheel hub 12.

Lead-out wiring 54 is drawn to upside from the downside of the 1st housing 244 by the 1st penetration hole 244f, and by the 2nd penetration hole 244g access 272 that leads.Lead-out wiring 54, through access 272, is drawn out to the outside of wheel hub 12 from the 1st side face opening 220a.

Rotor 230 by the magnetic interaction with stator 270 in surrounding's rotation of axle 220.Rotor 230 comprises 62,10 magnets 63 of rotor core and rotor retainer 266.Axle 220 runs through rotor 230, and can free rotary ground supporting it.

Rotor retainer 266 is the parts that make rotor core 62 and sun gear 234 mechanical connections.The 8th ball bearing 278 is between rotor retainer 266 and axle 220, and axle 220 is situated between can free rotary ground supporting rotor retainer 266 by the 8th ball bearing 278.Rotor retainer 266 is situated between and can be rotated freely and be installed on the 2nd housing 246 by the 9th ball bearing 280.

Transfer mechanism makes the torque of rotor 230 rotations transmit to wheel hub 12 from rotor 230 by wanting.Transfer mechanism comprises sun gear 234, the planetary gear set consisting of 3 planetary pinions 236 and internal gear 38.

Sun gear 234 is for example installed on the outer circumferential face of rotor retainer 266 by parallel latching 233.The rotation of sun gear 234 bear rotor 230, in surrounding's rotation of axle 220.Sun gear 234 is to be situated between by encircling with gap the external gear that encloses axle 220.That is, axle 220 runs through sun gear 234, and can free rotary ground supporting it.

Planetary pinion 236 is meshed with sun gear 234.Planetary pinion 236 comprises: the 3rd train of gearings 292; The 4th train of gearings 294, pitch ratio the 3rd train of gearings 292 is little; Planet pin 288, runs through the 3rd train of gearings 292 and the 4th train of gearings 294; And the overrunning clutch 232 of wedge block type or cammingly, between the 3rd train of gearings 292 and planet pin 288.

The 3rd train of gearings 292 and the 4th train of gearings 294 are arranged in fact coaxially.The 3rd train of gearings 292 is meshed with sun gear 234, and the 4th train of gearings 294 is meshed with internal gear 38.The 3rd train of gearings 292 and the 4th train of gearings 294 are independently individual, and the 4th train of gearings 294 is by being pressed into or the bonding planet pin 288 that is fixed in.The 3rd train of gearings 292 is situated between and is installed in planet pin 288 by the overrunning clutch 232 arranging separately and the 12nd ball bearing 290 on axle direction.

Overrunning clutch 232 is constituted as: in torque, by the pattern of transmitting from rotor 230 to wheel hub 12, the electric current that drives use, flow through winding 40 and stator 270 magnetic while driving the power operation of rotors 230, planet pin 288 is fixed in fact with respect to the 3rd train of gearings 292, in torque, during by the pattern of transmitting to the 4th train of gearings 294 from wheel hub 12, in wheel spin, planet pin 288 is rotatable with respect to the 3rd train of gearings 292.

The lower end of planet pin 288 is situated between and can be rotated freely and be installed on the 2nd housing 246 by the 11st ball bearing 298, and upper end is situated between and can be rotated freely and be installed on planet bearing 260 by the 10th ball bearing 296.The 2nd housing 246 comprises the housing recess 246a of the lower end of taking in planet pin 288.Planet bearing 260 comprises the bearing recess 260a of the upper end of taking in planet pin 288.

Be expert between prong seat 260 and the 2nd housing 246, three places on circumferentially adjacent planet pin 288 medium line each other, are provided with the connected element 289 that mechanically connects planet bearing 260 and the 2nd housing 246.

Planet bearing 260 has and runs through the upper protuberance 260b that extends to upside on the 1st cover portion 26 ground and the planet support 260c of the outside expansion from upper protuberance 260b to radial direction.Bearing recess 260a is located at planet support 260c, and connected element 289 is installed in planet support 260c.At upper protuberance 260b, along running shaft R, be formed with embedding hole 260d.The upper end of axle 220 is by being pressed into or the bonding embedding hole 260d that is fixed in.A part of planet support 260c, particularly corresponding with bearing recess 260a part enter into wheel hub recess 94.

The action of the wheel driver 210 forming is as described above described.When power moves, the driving current of three-phase offers winding 40 by lead-out wiring 54.Along with this driving current flows through winding 40, along 12 prominent utmost points, produce flux.By this flux, magnet 63 is endowed torque.Transfer mechanism makes the torque of rotor 230 rotations transmit to wheel hub 12 from rotor 230 by wanting.Thus, wheel is just wanted with respect to axle 220 rotations.Critical piece with respect to axle 220 rotations when power moves is rotor 230, sun gear 234, internal gear 38 and wheel hub 12.The 3rd train of gearings 292 is fixed with respect to planet pin 288 because of the effect of overrunning clutch 232, and planetary pinion 236 rotates integratedly.

When idle running, torque is situated between and to the 4th train of gearings 294, is transmitted from wheel hub 12 by internal gear 38, and because of the effect of overrunning clutch 232, planet pin 288 is with respect to the 3rd train of gearings 292 rotations.The 3rd train of gearings 292, sun gear 234 and rotor 230 keep in fact static with respect to axle 220.

According to the wheel driver 210 of present embodiment, because of the effect of overrunning clutch 232, when power moves, torque transmitted from rotor 230 to wheel hub 12, when idle running, the rotation with respect to axle 220 of sun gear 234 is suppressed.Therefore, can reduce the noise that produces from wheel driver 210 in when idle running.Its result, can improve possess wheel driver 210 vehicle take sensation.About the wheel driver 210 of present embodiment, also obtain showing the experimental result of the noise decrease effect the same with Fig. 4.

In addition,, in the wheel driver 210 of present embodiment, the part corresponding with the bearing recess 260a of planet support 260c enters into wheel hub recess 94.In addition, existence range on the axle direction of the 10th ball bearing 296 has the common part of the existence range on the axle direction with the 1st ball bearing 74, and the existence range on the axle direction of the 11st ball bearing 298 has the common part of the existence range on the axle direction with the 9th ball bearing 280.According to these, can make wheel driver 210 thinner on axle direction.

In addition,, in the wheel driver 210 of present embodiment, the upper end of planet pin 288 and lower end are all housed in the recess as non-through hole.Therefore, 2 planetary gear bearing axles 288 of energy, and improve planet bearing 260, the 2nd housing 246 rigidity separately.

In addition,, in the wheel driver 210 of present embodiment, the 3rd train of gearings 292 and the 4th train of gearings 294 are independently individual.Therefore,, when the assembling of wheel driver 210, can adjust arbitrarily the phase place between them.Its result, the spent time of phase alignment between gear during assembling reduces, and manufacturing efficiency improves.

Structure and the action of the wheel driver of mode of execution have more than been described.Those skilled in the art are illustration when understanding above-mentioned mode of execution, and the combination of its each constituting component can have various variation, and this variation comprises within the scope of the invention equally.

In the 1st and the 2nd mode of execution, illustrated that internal gear and the 1st cover portion are independently individual situations, but be not limited to this, also can form them.

In the 2nd mode of execution, the upper protuberance 260b of planet bearing 260 and the situation that planet support 260c is integrated have been described, but have been not limited to this, also can form independently them.

(label declaration)

10 wheel drivers, 12 wheel hubs, 20 axles, 30 rotors, 32 overrunning clutchs, 34 sun gears, 36 planetary pinions, 38 internal gears, 40 windings, 42 cores, 46 the 2nd planet bearings, 60 the 1st planet bearings, 70 stators.

Claims

1. make the wheel hub of wheel with respect to a wheel driver for axle rotation, it is characterized in that, comprising:

Stator, is fixed on above-mentioned axle,

Rotor, based on the magnetic interaction of said stator in surrounding's rotation of above-mentioned axle, and

Transfer mechanism, makes the torque of above-mentioned rotor from above-mentioned rotor to above-mentioned wheel hub transmission by wanting;

Wherein, above-mentioned transfer mechanism comprises:

Sun gear, the rotation of bearing above-mentioned rotor, in surrounding's rotation of above-mentioned axle,

Planetary gear set, with above-mentioned sun gear engagement, and

Internal gear, is fixed on above-mentioned wheel hub, with above-mentioned planetary gear set engagement;

This wheel driver also comprises the planetary planet support unit can the above-mentioned planetary gear set of free rotary ground supporting comprising;

Above line star support unit is situated between and is installed in above-mentioned axle by overrunning clutch.

2. wheel driver as claimed in claim 1, is characterized in that,

Above-mentioned overrunning clutch is constituted as: the pattern from above-mentioned rotor to above-mentioned wheel hub transmitting torque, above line star support unit is fixed in fact with respect to above-mentioned axle, pattern from from above-mentioned wheel hub to above-mentioned planetary gear set transmitting torque, above line star support unit is rotatable with respect to above-mentioned axle.

3. wheel driver as claimed in claim 1 or 2, is characterized in that,

Above line star support unit comprises:

Planet axis, runs through the planetary pinion that above-mentioned planetary gear set comprises, and can this planetary pinion of free rotary ground supporting,

The 1st planet bearing of one end of fixing above-mentioned planet axis, and

The 2nd planet bearing of the other end of fixing above-mentioned planet axis.

4. wheel driver as claimed in claim 3, is characterized in that,

Above-mentioned the 1st planet bearing is installed in above-mentioned overrunning clutch, and above-mentioned the 2nd planet bearing Jie is installed in above-mentioned rotor by ball bearing.

5. wheel driver as claimed in claim 4, is characterized in that,

Above-mentioned rotor is situated between and is installed in above-mentioned axle by another ball bearing;

Above-mentioned ball journal carrier ring is placed and is stated another ball bearing.

6. the wheel driver as described in any one of claim 1 to 5, is characterized in that,

Above-mentioned axle is included in the 1st axle and the 2nd axle of the interior side engagement of above-mentioned wheel hub;

Above-mentioned the 1st axle and end above-mentioned the 2nd axle opposition side and above-mentioned the 2nd axle and end above-mentioned the 1st axle opposition side are formed respectively the non-rotating symmetry of running shaft of relative above-mentioned wheel hub;

Above-mentioned the 1st axle is constituted as with the anastomosis part of above-mentioned the 2nd axle: impel the angular orientation of above-mentioned the 1st axle and end above-mentioned the 2nd axle opposition side and above-mentioned the 2nd axle align with the angular orientation of end above-mentioned the 1st axle opposition side.

7. the wheel driver as described in any one of claim 1 to 6, is characterized in that,

Said stator comprises:

Core, a plurality of prominent utmost point that there is annulus portion and extend internally along radial direction from this annulus portion,

Winding, is wound and is formed at above-mentioned a plurality of prominent extremely go up, and

Housing, is fixed on above-mentioned axle, supports above-mentioned core;

This wheel driver also comprises the magnetic driver part of ring-type, relative along radial direction with above-mentioned a plurality of prominent utmost points, is formed with in a circumferential direction a plurality of magnetic poles;

Above-mentioned rotor comprises:

Parts holding part, is crimped the inner peripheral surface of above-mentioned magnetic driver part, and

The relative portion of parts, than the large footpath of above-mentioned parts holding part and be located at above-mentioned sun gear side, and relative on axle direction with the face of the above-mentioned sun gear side of above-mentioned magnetic driver part.

8. the wheel driver as described in any one of claim 1 to 7, is characterized in that,

Above-mentioned wheel hub is situated between and is installed in above-mentioned axle by being arranged on axle direction than wheel hub ball bearing more in the outer part of above-mentioned overrunning clutch;

Above-mentioned wheel hub is constituted as to form to encircle places the wheel hub recess of stating wheel hub ball bearing;

Above line star support unit enters into above-mentioned wheel hub recess.