Summary of the invention
Therefore, the objective of the invention is: provide inner yoke to be set can improve the flux density that acts on coil, simultaneously, also easier in-wheel motor of assembling and elec. vehicle.
For realizing the in-wheel motor of said purpose, be characterized in having: cylindric coil, all sides are inserted with axle in it; The coil support member, it is fixed on axle and support coils; Cylindric outside yoke, it is configured in the outer circumferential side of coil, and is fixed on wheel rim; Magnetite, it is fixed on the inner peripheral surface of outside yoke, and be configured in the outer peripheral face of coil in opposite directions and right; Cylindric inner yoke, it is configured in interior all sides of coil, and be configured in the inner peripheral surface of coil in opposite directions and right; Wherein, outside yoke and inner yoke rotate freely with respect to axle respectively, and disconnected from each other.
Described in-wheel motor, further, outside yoke has: main part, it comprises cylindrical portion and the bottom surface sections that is arranged on an end of cylindrical portion; And cap, it is arranged on the other end of cylindrical portion.Be formed with the patchhole of axle on bottom surface sections and the cap respectively, thereby fix the inside of airtight outside yoke to main part and cap.
For the inventive features of the elec. vehicle of realizing said purpose is to have described in-wheel motor.
According to described in-wheel motor, because of the interior all sides at coil are provided with inner yoke, outside yoke and inner yoke can improve the flux density that acts on coil, can improve driving torque.
The assembling of in-wheel motor for example, is fixed on the coil support member on the axle, and is installed in the rotation of inner yoke freely on the axle, afterwards, coil configuration in the periphery of inner yoke and be fixed on the coil support member.Then, be installed in periphery that is positioned at coil and the outside yoke rotation that is fixed with magnetite on it freely on the axle, again the external yoke ferropexy on wheel rim.
Like this, coil and coil support member can not hinder installs inner yoke and outside yoke, and the assembling of in-wheel motor just can be easy to carry out.
Be formed with the patchhole of axle on bottom surface sections and the cap respectively, thereby fix the inside of airtight outside yoke to main part and cap, thereby can play the in-to-in waterproof action of outside yoke.
The specific embodiment
Below, with reference to Fig. 1 example of the present invention is elaborated.In-wheel motor 1 in this example is arranged in the wheel rim 5 of each wheel 3 of four wheels of electronlmobil, and the periphery of wheel rim 5 is equipped with tire 7, and with each wheel 3 of motorized motions.
In-wheel motor 1 has: be fixed on the stator discs 11 on the axle 9; Be fixed on the coil 13 of stator discs 11; Be configured in the outside yoke 15 of the outer circumferential side of coil 13; And the inside yoke 17. that is configured in coil 13 inboards
The hollow 19 that is used for distribution is formed on axle 9, passes the inner space of outside yoke 15 and is connected with coil 13 from the hollow 19 of axle 9 to the lead-in wire 21 of coil 13 power supplies.
Stator discs 11 as the coil support member is discoid, and the hole is formed on the central part of disk, and axle 9 runs through this hole.Stator discs 11 is fixed on the axle 9 by chock 12.
Coil 13 is cylindric, for example forms wire through the etching copper coin, is overlapped into multilayer after the insulation processing.An end of coil 13 is fixed on the periphery of stator discs 11.
Outside yoke 15 constitutes by main part 27 with through the cap 29 of screw retention at main part 27.Main part 27 is made up of cylindrical portion 27a cylindraceous that is arranged on coil 13 peripheries and bottom surface sections 27b.Cylindrical portion 27a is configured in the periphery of coil 13, and keeps at interval with coil 13.Interior all sides of cylindrical portion 27a are provided with magnetite 31, and magnetite 31 and coil 13 are in opposite directions and right.In addition, magnetite 31 be geomagnetic into a plurality of magnetic poles so that around direction have different magnetic poles.
The patchhole of axle 9 is formed on the middle body of bottom surface sections 27b, is inserted with axle 9 in the patchhole, and bottom surface sections 27b is fixed on the bearing 35 through screw 37.Also have, bottom surface sections 27b is configured in the medial surface of wheel rim 5, and is fixed on wheel rim 5 from the outside of wheel rim 5 with screw 33.
Cap 29 is discoid, and its central portion is formed with the patchhole of axle 9, inserts patchhole to axle 9, and is fixed on the bearing 41 with screw 43.Also have, the peripheral part of cap 29 is fixed on the main part 27a through screw 45.
Inner yoke 17 by: through coil 13 and magnetite 31 in opposite directions and right cylindric yoke main body 17a; And support portion 17b constitutes.Support portion 17b 18 is radial and is provided with a plurality ofly from the bottom, and bottom 18 is fixed on axle 9 the bearing 47 through screw 49.
Outside yoke 15, inner yoke 17 and axle 9 all are to be made up of magnetic substance, to form the path of magnetic flow.
Below, just in the example of the present invention, installation and action effect thereof in the wheel rim 5 of in-wheel motor 1 describe.
About the installation of in-wheel motor 1, at first insert axle to the cap 29 of outside yoke 15, and be fixed on the bearing 41 of axle 9 with screw 43.Secondly, be fixed on the stator discs that is fixed with coil 13 on it 11 on the axle 9, be fixed on the yoke body supports 17b of portion of inner yoke 17 on the bearing 47 through screw 49 again with chock 12.The main part 27 of outside yoke 15 is installed afterwards.When main part 27 is installed, be configured in the outer circumferential side of coil 13 to cylindrical portion 27a, and make axle connect the hole of bottom surface sections 27b, be fixed on the bearing 35 with screw 37 then.Bearing 35 is fixed on the axle 9.
Then, be fixed on the main part 27 of outside yoke 15 after the cap 29, be fixed on the bottom surface sections 27b of outside yoke 15 on the wheel rim 5 through screw 33 again through screw 45.
Driving about in-wheel motor 1; Coil 13 is given in 21 power supplies through going between; Magnetic field with respect between magnetite 31 and the inner yoke 17 just produces electromagnetic force; Therefore magnetite 31 rotates with respect to coil 13 with outside yoke 15 together, and the wheel rim 5 that is fixed on outside yoke 15 just is driven in rotation with respect to axle 9.And inner yoke 17 also rotates with outside yoke 15 synchronously.
The path of the magnetic flow of magnetite 31 is, from opposite directions and the loop of right inside yoke 17 through axle 9 and outside yoke.
According to this example, because inner yoke 17 is members separately with outside yoke 15, through being arranged separately in respectively on the axle 9, even the inboard of coil 13 is provided with the structure of inner yoke 17, also can easy mounting.
In this example, the magnetic flow that magnetite 31 acts on coil 13 is through by inner yoke 17, and the flux density that acts on coil 13 can be improved in the loop of the path that axle 9 and outside yoke 15 form therefore.Like this and do not have the occasion of inner yoke to compare, the torque that acts on the wheel rim 5 can be improved.
In this example, cap 29 and main part 27 make outside yoke 15 waterproof, thereby can prevent in outside yoke 15, to sneak into foreign matter, and simultaneously, water resistance is better.
Inner yoke 17 is the members that separate with outside yoke 15, and rotates freely with respect to axle 9 respectively, therefore stops after coil 13 energisings, producing generation current through being connected loads such as battery coil 13, thereby starting regenerative brake.In wheel rim 5 rotations, because the magnetic action that retracts magnetite on inner yoke 17, so suppressed the rotation of outside yoke 15, can play the effect of auxiliary braking for this reason.
The present invention is not limited to above-mentioned example, in the scope that does not break away from main idea of the present invention, can carry out all changes.For example: outside yoke 15 can not need airtight construction, and through forming air extractor vent to play inner colded effect.
Also can make cylindrical portion 27a and the bottom surface sections 27b of the main part 27 of outside yoke be member separately, fixing with screw etc. again.
Screw 37,43,45 can be respectively bolt also.