JP3903895B2 - Bobbin support structure for in-wheel motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-wheel motor that is disposed in a wheel of a vehicle and rotationally drives a drive wheel, and more particularly to a support structure for a bobbin around which a stator coil is wound.
[0002]
[Related background]
An in-wheel motor that is arranged in the wheel of a vehicle and directly drives the drive wheels has various advantages such as space saving on the vehicle body side, omission of transmission and differential gear, and omission of the drive shaft in the case of independent suspension. Therefore, it is widely implemented mainly for relatively small vehicles such as forklifts and golf carts.
[0003]
In this type of in-wheel motor, an annular stator core on which electromagnetic steel plates are superimposed is fixed in a housing, and a bobbin around which a stator coil is wound is fitted to a large number of core portions arranged on the stator core. The rotor which consists of a permanent magnet is rotatably supported by the inner periphery of this stator. The stator coils are sequentially energized by the controller based on the rotation angle of the rotor, a rotational force is applied to the rotor by a magnetic field generated in the stator core, and the rotation of the rotor is transmitted to the drive wheels after being decelerated through a reduction mechanism.
[0004]
In this in-wheel motor, no special measures are taken to fix the bobbin to the core part of the stator core, and the clearance between the core part and the bobbin is reduced as much as possible to suppress the backlash of the bobbin with respect to the core part.
However, rattling of the bobbin generates vibration during operation of the in-wheel motor, and this vibration may cause noise and adversely affect the wear and damage of each part of the motor. It is a necessary requirement. In the above-described bobbin support structure, in order to suppress the backlash of the bobbin to such an extent that these problems can be suppressed, it is necessary to keep both the core part and the bobbin with extremely high accuracy, resulting in a problem that the manufacturing cost increases. End up. Further, even if the desired accuracy can be achieved, there is a problem that it is difficult to avoid the above-mentioned problem because it is easily rattled due to slight wear.
[0005]
On the other hand, a structure has been proposed in which an annular support ring cut out on one side is fitted onto the stator and the stator is supported by the spring force (see, for example, Patent Document 1). Therefore, it is conceivable to bind the bobbins of the stator using this support ring.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 6-49083 (page 3, FIG. 1)
[0007]
[Problems to be solved by the invention]
However, in the bobbin support structure using the support ring described in Patent Document 1, the cores are bound using the spring force of the support ring, so that the binding force is limited, and the coil is wound to a considerable extent. It was insufficient to suppress the backlash of each bobbin having a weight.
[0008]
Accordingly, an object of the present invention is to prevent the rattling of the bobbin with respect to the core portion while suppressing an increase in manufacturing cost in advance, and thereby to prevent noise generation due to the rattling and adverse effects on each part of the motor. Another object of the present invention is to provide a bobbin support structure for an in-wheel motor that can be prevented.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention of claim 1 is to form a stator by arranging a large number of core portions on an annular stator core and fitting bobbins each having a stator coil wound around each core portion. In the in-wheel motor in which the stator is accommodated along the axial direction in the stator accommodating portion formed in the housing, and the rotor is rotatably supported on the inner peripheral side of the stator and the drive wheels of the vehicle are connected. A ring groove formed on the outer peripheral surface of each bobbin and extending in the circumferential direction to surround the outer periphery of each bobbin, and fitted into the ring groove of each bobbin, and in contact with the inner wall of the stator accommodating portion of the housing And a bundling member that is restricted from being detached from the ring groove.
[0010]
Therefore, each core portion on the stator core is fitted with a bobbin around which the stator coil is wound, and a binding member is fitted in the ring groove of each bobbin. In this state, when the stator is accommodated in the stator accommodating portion along the axial direction, the binding member comes into contact with the inner wall of the stator accommodating portion and is separated from the ring groove, and each bobbin is arranged on the inner peripheral side by the binding member. The core portion is firmly bound without causing backlash. As a result, a situation in which vibration occurs during operation of the in-wheel motor due to rattling of the bobbin is avoided, and noise generation due to vibration and adverse effects on each part of the motor are prevented in advance.
[0011]
The invention of claim 2 is the invention according to claim 1, wherein the bundling member is a ring-shaped bundling ring with one side notched, and is fitted into the ring groove of each bobbin by its own tension in the diameter reducing direction. is there.
Therefore, an annular binding ring with one side notched can be easily fitted into the ring groove of each bobbin while expanding the notch portion, and each bobbin is attached to the inner peripheral side by the tension of this binding ring. Since it is energized and preliminarily bound, each bobbin can be easily accommodated without interfering with the stator accommodating portion.
[0012]
According to a third aspect of the present invention, in the second aspect, the binding ring has a circular cross section.
Therefore, when the stator is accommodated in the stator accommodating portion, the bundling ring is guided naturally in the stator accommodating portion following the circular arc of the cross section, so that the stator accommodating operation is further facilitated.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an in-wheel motor embodying the present invention will be described.
The in-wheel motor of this embodiment is provided in each of the left and right rear wheels of the electric vehicle, and is driven and controlled by a controller according to the driver's accelerator operation to individually rotate and drive each rear wheel.
[0014]
FIG. 1 is a cross-sectional view of an in-wheel motor provided on the left rear wheel of the present embodiment as viewed from the rear, in which the right side corresponds to the vehicle body side and the left side corresponds to the tire side. The housing of the in-wheel motor 1 is composed of a motor housing 2a and a gear housing 2b, and both the housings 2a and 2b are joined from the left and right and fixed by bolts (not shown). The lower end of the strut 3 and the outer end of the lower arm 4 from the vehicle body side are connected to the right side surface of the motor housing 2a, and the entire in-wheel motor 1 is supported to the vehicle body via the strut 3 and the lower arm 4. .
[0015]
In the housings 2a and 2b, a rotor shaft 5 and a spindle shaft 6 are coaxially disposed so as to extend in the left-right direction (vehicle width direction), and a counter shaft 7 is provided at an eccentric position with respect to these shafts 5 and 6. It arrange | positions in parallel and each shaft 5-7 is rotatably supported by the bearing 8 separately. Although not shown, the left end of the rotor shaft 5 is supported by a bearing provided at the right end of the spindle shaft 6.
[0016]
A rotor gear 9 is integrally formed on the rotor shaft 5, and a spindle gear 10 is integrally formed on the spindle shaft 6, and a first counter gear 11 that meshes with the rotor gear 9 and a second counter gear that meshes with the spindle gear 10 on the counter shaft 7. 12 is integrally formed. Therefore, the rotation of the rotor shaft 5 is decelerated in two stages between the rotor gear 9 and the first counter gear 11 and between the second counter gear 12 and the spindle gear 10 and is transmitted to the spindle shaft 6.
[0017]
For the purpose of lubrication of the gears 9 to 12 and cooling of the stator coil 32 to be described later, oil is stored in the housings 2a and 2b, and the oil level of the oil is the gears 9 to 12 and a rotor to be described later. In order to suppress an increase in the rotational resistance of 25, the height is adjusted to about の in the housings 2a and 2b.
The left end of the spindle shaft 6 protrudes to the right from the gear housing 2b and a wheel hub 15 is fixed. A wheel 16 of a driving wheel is attached to the wheel hub 15 by a nut 17, and the in-wheel motor 1 is positioned in the wheel 16. is doing. The wheel hub 15 has a bottomed cylindrical shape that opens to the right, and the opening is closed by a disc-shaped back plate 18 fixed to the gear housing 2b. A hydraulic drum brake 19 is built in the wheel hub 15. When hydraulic fluid is supplied from the vehicle body via the hydraulic pipe 20 in accordance with a brake operation by the driver, the drum brake 19 is activated and braking force is increased. It has come to be obtained.
[0018]
On the other hand, a disk-shaped rotor hub 23 is press-fitted into the rotor shaft 5, and a large number of rotor cores 24 made of permanent magnets are fixed to the outer periphery of the rotor hub 23. Is configured. A sensor plate 27 is fixed to the rotor hub 23 by bolts 26, and detection portions 27 a are formed at six equally divided outer circumferences of the sensor plate 27. As the rotor 25 rotates, the detection portion 27a of the sensor plate 27 sequentially opposes the rotation angle detection sensor 28 fixed to one side of the gear housing 2b, and the rotation angle detection sensor 28 synchronizes with the rotation angle of the rotor 25. The detected signal is output to the controller 53 described later.
[0019]
2 is a partially enlarged sectional view showing details of the stator 31, FIG. 3 is a sectional view taken along the line III-III of FIG. 2 showing the details of the stator 31, and FIG. 4 shows the relationship between the stator core 32, the bobbin 33, and the binding ring 40. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2, and details of the stator 31 will be described below with reference to these drawings.
An annular stator 31 is disposed on the outer periphery of the rotor 25, and the inner periphery of the stator 31 is opposed to the outer periphery of the rotor core 24 via a predetermined gap. The stator 31 is configured by arranging a large number of bobbins 33 around which a stator coil 32 is wound on an annular stator core 34, and an annular stator housing portion 35 formed around the rotor shaft 5 in the motor housing 2a. It is arranged in the inside.
[0020]
In particular, as shown in FIGS. 2 and 4, the stator core 34 includes an inner core 36 on the inner peripheral side and an outer core 37 on the outer peripheral side, and is manufactured by laminating a number of electromagnetic steel sheets in the left-right direction. A large number of core portions 36a projecting in the outer peripheral direction are arranged at equal intervals on the inner core 36, and the outer core 37 is externally fitted to the tip of each core portion 36a. Between the inner core 36 and the outer core 37, each core portion 36a is fitted with a bobbin 33 injection-molded from a synthetic resin material, and a stator coil 32 is wound around each bobbin 33.
[0021]
As shown in FIGS. 2 and 4, a bobbin side ring groove 38 is formed on the outer peripheral surface of each bobbin 33 around the rotor shaft 5 along the right side surface of the stator core 34. It continues in the circumferential direction so as to surround the outer periphery of each bobbin 33. A housing-side ring groove 39 is formed on the entire inner periphery of the stator housing portion 35 so as to face the bobbin-side ring groove 38.
[0022]
A bundling ring 40 (bundling member) is disposed inside the bobbin side ring groove 38 and the housing side ring groove 39. The bundling ring 40 has a circular cross section and has an annular shape extending in the entire circumferential direction of the ring grooves 38 and 39, and one side thereof is cut away to form a cutout portion 40a. The binding ring 40 is fitted into the bobbin side ring groove 38 by its own tension in the diameter reducing direction, and abuts against the inner wall of the housing side ring groove 39, so that the outer ring extends from the inside of the bobbin side ring groove 38 along with the expansion. It is regulated to leave. Accordingly, the bobbins 33 are urged toward the inner peripheral side by the binding ring 40 and are firmly bound to the core portion 36a of the inner core 36 without causing backlash.
[0023]
The outer core 37 of the stator core 34 is fixed to the motor housing 2a by a bolt (not shown), and as is clear from FIG. 2, the movement of the inner core 36 to the left via the binding ring 40 is restricted. As a whole, the stator 31 is fixed in the stator housing portion 35.
As shown in FIGS. 2 and 3, holder portions 43 projecting to the left are formed on the outer peripheral side and the inner peripheral side of each bobbin 33, and the U-phase holding groove 43 u and the holder portion 43 on the outer peripheral side are formed. A V-phase holding groove 43v is formed, and a W-phase holding groove 43w is formed in the holder portion 43 on the inner peripheral side. Each stator coil 32 is separated into three phases of U, V, and W and arranged alternately, and wiring 32w drawn from the stator coil 32 corresponding to the U phase (the substance is the end of the stator coil 32, but the following) (Referred to as the wiring of the stator coil 32) is assembled to the terminal base 44 provided on one side of the housings 2a and 2b while being fitted and supported in the U-phase holding groove 43u. The wiring 32v drawn from the coil 32 is fitted into the V-phase holding groove 43v, and the wiring 32w drawn from the W-phase stator coil 32 is fitted and supported in the W-phase holding groove 43w. Yes.
[0024]
In order to shorten the length of the stator coil 32, the wires 32u, 32v, and 32w of the stator coil 32 corresponding to a half circumference are shown in FIG. 3 with the bobbin 33 farthest from the terminal board 44 as a boundary. Although guided clockwise, the wirings 32u, 32v, 32w of the stator coil 32 for the remaining half circumference are guided counterclockwise, although not shown. Further, the wirings 32u, 32v, and 32w maintain the routing shape by their own rigidity, thereby preventing separation from the holding grooves 43u, 43v, and 43w.
[0025]
Each bobbin 33 is formed with a slack restricting portion 45 in the vicinity of the inner peripheral side holder portion 43, and although not shown in FIG. 2, the slack restricting portion 45 is left like the inner peripheral side holder portion 43. It protrudes toward. As shown in FIG. 3, the wiring 32 w drawn from the W-phase stator coil 32 is guided to the W-phase holding groove 43 w of the holder portion 43 through the outer peripheral side of the slack regulating portion 45. Therefore, the slack restricting portion 45 restricts the slack of the wiring 32w toward the inner peripheral side, thereby preventing the interference of the wiring 32w with the rotor 25 rotating on the inner peripheral side.
[0026]
On the other hand, the terminal board 44 is injection-molded with a synthetic resin material, and is disposed along the joint surface between the motor housing 2a and the gear housing 2b on one side of the outer periphery of the stator 31. The terminal board 44 is fixed to the motor housing 2b by screws 44a. As shown in FIG. 2, both side surfaces of the terminal board 44 are exposed in terminal accommodating portions 46a and 46b formed in the motor housing 2a and the gear housing 2b, respectively. is doing. Three bolt holes 47 corresponding to each phase are formed through the front and back of the terminal board 44, and metal terminal bolts 48 are inserted into the respective bolt holes 47 from the motor housing 2b side. The tip of each terminal bolt 48 protrudes toward the gear housing 2b, and a metal terminal nut 49 is screwed into each terminal bolt 48.
[0027]
The wirings 32u, 32v, 32w from the stator coils 32 are bundled for each phase on both sides (left and right sides in FIG. 3) of the terminal board 44 and connected to the terminals 50, and the terminal housing portion on the gear housing 2b side. Each terminal 50 is sandwiched between the corresponding terminal nut 49 and the terminal board 44 in 46b. On the other hand, a terminal 51 is also sandwiched between the terminal bolt 48 of each phase and the terminal board 44, and a power cable 52 of each phase is connected to each terminal 51 in the terminal accommodating portion 46a on the motor housing 2a side. Yes.
[0028]
Accordingly, the wirings 32u, 32v, 32w of the stator coil 32 and the power cable 52 are fixed to the terminal board 44 by the terminal bolts 48 and the terminal nuts 49, and the metal terminal bolts 48 and the terminal nuts 49 are interposed therebetween. Are mutually connected.
On the other hand, FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 2 showing the motor housing 2a side of the terminal board 44. As shown in this figure, a bolt rotation restricting portion 55 is provided on the motor housing 2a side of the terminal board 44. The bolt rotation restricting portion 55 is erected and is in contact with a plurality of sides of the head of each terminal bolt 48 having a hexagonal shape to restrict the rotation of the terminal bolt 48. Further, a terminal rotation restricting portion 56 is extended from the bolt rotation restricting portion 55 corresponding to each terminal 51 of the power cable 52, and the rotation of each terminal 51 around the terminal bolt 48 by the terminal rotation restricting portion 56. Is regulated. Further, as shown in FIG. 3, terminal rotation restricting portions 57 are erected on the side of the gear housing 2b of the terminal board 44 in correspondence with the terminals 50 of the wires 32u, 32v, 32w from the stator coil 32. The terminal rotation restricting portion 57 restricts the rotation of each terminal 50 around the terminal bolt 48.
[0029]
As shown in FIG. 2, a grommet mounting hole 60 having a circular cross section is provided in the motor housing 2a so as to communicate the inside of the terminal accommodating portion 46a and the outside of the housings 2a, 2b. A made grommet 61 is inserted with elasticity from the right side. FIG. 6 is a perspective view showing the grommet 61. As shown in FIG. 6, the grommet 61 has a substantially cylindrical shape as a whole, and its tip (the left end in FIGS. 2 and 6) is formed on the inner periphery of the grommet mounting hole 60. It is positioned in the axial direction (left-right direction) in contact with the stepped portion 60a. A fixing plate 63 is attached to the outer wall surface of the motor housing 2a by bolts 62. The fixing plate 63 comes into contact with a flange portion 61a formed at an intermediate portion of the grommet 61 from the right side and enters the grommet mounting hole 60 from the inside. The grommet 61 is prevented from being detached.
[0030]
Reference numeral 64 denotes a grip portion for gripping the grommet 61 when it is inserted into the grommet mounting hole 60.
In addition, two engagement grooves 60b are formed in the grommet attachment hole 60 over the entire circumference, and the engagement protrusions formed in the outer periphery of the grommet 61 over the entire circumference in these engagement grooves 60b. 61b is engaged with elasticity, and thereby the oil tightness between the outer periphery of the grommet 61 and the inner periphery of the grommet mounting hole 60 is maintained.
[0031]
The grommet 61 is formed with three seal holes 65 penetrating the inside and the outside of the motor housing 2a. Each seal hole 65 has a circular cross section corresponding to the power cable 52, and the inner diameter thereof is the outer diameter of the power cable 52. Is almost the same. The power cable 52 from the terminal board 44 is inserted into each seal hole 65 for each phase, and the outer end of the power cable 52 taken out of the motor housing 2 a is connected to the controller 53.
[0032]
In each seal hole 65, two seal ridges 65a are formed over the entire circumference, and each seal ridge 65a is elastically pressed against the outer periphery of the power cable 52, and at these seal ridges 65a. The inside and outside of the housings 2a and 2b are partitioned to maintain oil tightness.
As shown in FIG. 3, an oil temperature sensor 66 is disposed on one side of the stator 31, and a wiring 67 from the oil temperature sensor 66 uses a holding portion 68 formed on one side of the terminal base 44. While being held, the grommet 61 is guided to the grommet 61. Although not shown, the controller 53 outside the housings 2a and 2b passes through a seal hole 69 formed in the grommet 61 (having a seal protrusion with the same configuration as the seal hole 65). It is connected to the.
[0033]
The in-wheel motor 1 of this embodiment is configured as described above, and the controller 53 sequentially energizes the stator coil 32 of the stator 31 corresponding to the rotation angle of the rotor 25 based on the detection signal of the rotation angle detection sensor 28. Then, a rotational force is applied to the rotor 25 by the magnetic field generated in the stator core 34 as the stator coil 32 is excited. The rotation of the rotor 25 is transmitted to the spindle shaft 6 while being decelerated by the respective gears 9 to 12, and the driving wheels are driven to rotate together with the spindle shaft 6 so that the vehicle travels. The controller 53 adjusts the electric power supplied to the stator coil 32 on the basis of the driver's accelerator operation amount, thereby realizing traveling according to the accelerator operation. Further, when the vehicle is decelerated, the rotor 25 is rotationally driven along the reverse transmission path from the drive wheels, and the regenerative power generated in the stator coil 32 is charged in a battery (not shown).
[0034]
Then, the annular binding ring 40 is fitted into the bobbin side ring groove 38 of each bobbin 33 so that the binding ring 40 contacts the inner wall of the housing side ring groove 39 in a state where the stator 31 is accommodated in the stator accommodating portion 35. Therefore, the bundling ring 40 is restricted from being separated from the bobbin side ring groove 38 to the outer peripheral side with the expansion, thereby urging each bobbin 33 to the inner peripheral side.
[0035]
That is, each bobbin is bound by the spring force of the support ring as in the case of using the support ring of Patent Document 1, whereas in this embodiment, the inner wall of the housing-side ring groove 39 via the binding ring 40. Since each bobbin 33 is urged toward the inner peripheral side, each bobbin 33 is firmly bound to the core portion 36a of the inner core 36 without rattling. As a result, without particularly increasing the accuracy of the core portion 36a and the bobbin 33, it is possible to prevent the occurrence of vibration during the operation of the in-wheel motor 1 due to rattling of the bobbin 33 while suppressing an increase in manufacturing cost. In addition, it is possible to reliably prevent noise generation due to vibrations and adverse effects on each part of the motor.
[0036]
On the other hand, when the stator portion is assembled, the bobbin 33 is fitted into each core portion 36 a of the inner core 36, the outer core 37 is externally fitted, and the binding ring 40 is fitted into the bobbin side ring groove 38 of each bobbin 33. In addition, the entire stator is accommodated in the stator accommodating portion 35 along the axial direction (left-right direction in FIG. 2), and the outer core 37 is fixed with a bolt (not shown).
[0037]
The binding ring 40 before being housed in the stator housing portion 35 plays a role of preliminarily binding the bobbins 33. In other words, each bobbin 33 is displaced within the range of rattling with respect to the core portion 36a, but is urged toward the inner peripheral side by the tension of the binding ring 40 and is bound, so that when the stator is housed, each bobbin 33 is housed in the stator. It can be easily accommodated without interfering with the portion 35. Further, the cross-sectional shape of the bundling ring 40 also contributes to the ease of storage of the stator 31, and the bundling ring 40 is naturally guided into the housing-side ring groove 39 of the stator housing portion 35 following the cross-sectional arc. Therefore, the accommodating operation of the stator 31 can be performed more easily.
[0038]
In addition, since the binding ring 40 has an annular shape with one side notched, it can be easily fitted into the bobbin side ring groove 38 of each bobbin 33 while expanding the notch 40a. Contributes to easy operation. Therefore, since the bundling member is configured as the bundling ring 40 as described above, it is possible to not only prevent the trouble caused by the rattling of the bobbin 33 but also to easily perform the assembly work of the in-wheel motor 1. Can also be obtained.
[0039]
This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the in-wheel motor 1 provided on the rear wheel of the electric vehicle is embodied. However, the present invention is not limited to this. For example, the front wheel or all the wheels are replaced with the in-wheel. The motor 1 may be provided, or may be embodied in an in-wheel motor 1 for a hybrid vehicle that includes an engine together with a motor as a travel drive source.
[0040]
In the above embodiment, the binding ring 40 is formed to have a circular shape with a circular cross section and one side notched. However, the present invention is not limited to this. For example, the cross sectional shape may be changed to a square shape. Good. Further, if it is not necessary to preliminarily bind the bobbin 33 due to the tension of the binding ring 40, for example, the binding ring 40 is divided into two semicircular shapes without forming an annular shape, and each of the bobbins 33 has a ring groove 38 on the bobbin side. You may make it fit in. Even in this case, the bundling of the bobbin 33 can be prevented by the bundling rings 40 coming into contact with the inner wall of the stator housing portion 35 as in the above embodiment.
[0041]
【The invention's effect】
As described above, according to the bobbin support structure for an in-wheel motor of the first aspect of the present invention, since the restraining member is fitted in the ring groove of the bobbin and is brought into contact with the inner wall of the stator housing portion, Each bobbin can be urged to the inner peripheral side and firmly restrained against rattling, and as a result, without particularly increasing the accuracy of the core and bobbin, the increase in manufacturing cost is suppressed in advance. It is possible to reliably prevent the generation of noise due to vibration caused by the rattling of the bobbin and adverse effects on each part of the motor.
[0042]
According to the bobbin support structure for an in-wheel motor of the second aspect of the invention, in addition to the first aspect, each bobbin is preliminarily bound by an annular binding ring cut out on one side, so that the stator can be easily accommodated. Can be
According to the in-wheel motor bobbin support structure of the invention of claim 3, in addition to claim 2, since the binding ring has a circular cross section, the binding ring can be guided naturally into the stator accommodating portion following the circular arc of the cross section, The accommodating operation of the stator can be performed more easily.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an in-wheel motor provided on a left rear wheel of an embodiment as viewed from the rear.
FIG. 2 is a partially enlarged cross-sectional view showing details of a stator.
3 is a cross-sectional view taken along the line III-III of FIG. 2 showing details of the stator.
4 is a cross-sectional view taken along the line IV-IV in FIG. 2 showing the relationship between the stator core, the bobbin, and the bundling ring.
5 is a cross-sectional view taken along line VV in FIG. 2 showing the motor housing side of the terminal board.
FIG. 6 is a perspective view showing a grommet.
[Explanation of symbols]
2a Motor housing 2b Gear housing 25 Rotor 31 Stator 32 Stator coil 33 Bobbin 34 Stator core 35 Stator accommodating portion 36a Core portion 38 Bobbin side ring groove 40 Binding ring (binding member)

Claims (3)

A large number of core portions are arranged on an annular stator core, and a stator is formed by fitting bobbins each having a stator coil wound around each core portion, and the stator is placed in a stator housing portion formed in the housing. In an in-wheel motor that is accommodated along the axial direction and that rotatably supports the rotor on the inner peripheral side of the stator and connects the driving wheels of the vehicle,
A ring groove formed on the outer peripheral surface of each bobbin and continuous in the circumferential direction so as to surround the outer periphery of each bobbin;
An in-wheel motor comprising: a bundling member that is fitted into a ring groove of each of the bobbins and that abuts against an inner wall of a stator housing portion of the housing and is prevented from being detached from the ring groove. Bobbin support structure. The in-wheel according to claim 1, wherein the bundling member is a bundling ring having an annular shape with one side notched, and is fitted into a ring groove of each bobbin by a self-tension in a diameter reducing direction. Motor bobbin support structure. The bobbin support structure for an in-wheel motor according to claim 2, wherein the binding ring has a circular cross section.

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