JP2008189029A - Tool for in-wheel motor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for an in-wheel motor unit capable of properly disassembling and incorporating a stator and a rotor. <P>SOLUTION: Since a moving part 103 is guided to a base part 101 while coaxially maintaining the stator 12 and the rotor 11 by a shaft 102 and a bush 103d, the rotor 11 can be relatively moved in the axial direction in a non-contact state against magnetic force to the stator 12 by driving the moving part 103 in the axial direction of the stator 12 or the rotor 11 to the base part 101 via a ball screw mechanism. Thus, the stator 12 and the rotor 11 can be easily incorporated and disassembled even in an actual car. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a jig for an in-wheel motor unit suitable for disassembling an in-wheel motor unit that drives drive wheels of a vehicle.

  In a conventional electric vehicle, torque is transmitted from one electric motor arranged on a vehicle body to wheels via a transmission and a differential mechanism. However, according to this method, there is a problem that a space for providing the electric motor, the transmission, and the differential mechanism is required, and the space for the occupant is limited accordingly. In addition, since a power transmission loss occurs in the transmission and the differential mechanism, there is a problem in that the torque transmitted to the wheels is reduced accordingly.

On the other hand, Patent Document 1 below discloses an outer rotor type wheel motor in which a motor is provided inside the wheel. According to such a wheel motor, since the motor can be built in the wheel, there is no need to mount an electric motor, a transmission, and a differential mechanism on the vehicle body, space for passengers can be secured, and no transmission or differential mechanism is involved. There is an advantage that power transmission loss is reduced.
Japanese Patent Laid-Open No. 10-285891

  By the way, in the in-wheel motor unit arranged on the inner side in the radial direction of the wheel after superposing the stator and the rotor in the radial direction, it is necessary to disassemble the rotor and the stator in the case of maintenance or the like. May occur. However, in the case of a permanent magnet type in-wheel motor unit, for example, the rotor must be pulled out against the stator against the magnetic force of a strong magnet. The rotor could not be pulled out.

  The present invention has been made in view of the problems of the prior art, and an object thereof is to provide an in-wheel motor unit jig capable of appropriately disassembling and incorporating a stator and a rotor.

The in-wheel motor unit jig of the present invention includes a stator that is fixed to a vehicle body side and a rotor that is attached so as to rotate integrally with a wheel of the wheel, and the stator that is superposed in a radial direction. And an in-wheel motor unit jig for assembling and disassembling an in-wheel motor unit in which at least a part of the rotor is disposed radially inside the wheel,
A base attached to the stator side;
A moving part attached to the rotor;
A guide part for guiding the moving part relative to the base part while maintaining the stator and the rotor coaxially;
And a drive unit that drives the moving unit in the axial direction of the stator or the rotor with respect to the base.

  According to the in-wheel motor unit jig of the present invention, the moving portion is guided with respect to the base portion while maintaining the stator and the rotor coaxially by the guide portion. The driving unit drives the moving unit relative to the base in the axial direction of the stator or the rotor so that the rotor is not contacted against the magnetic force against the magnetic force. In this state, the stator can be relatively moved in the axial direction, whereby the stator and the rotor can be easily assembled and disassembled.

  When the drive unit is composed of a screw shaft and a nut, the rotational force can be converted into an axial force. Therefore, the stator and the rotor can be easily assembled and disassembled manually.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an in-wheel motor unit to which the present embodiment can be applied in a state assembled to a vehicle.

  In FIG. 1, a bracket 1 having an axle 1a is attached to a vehicle body (not shown). Around the axle 1a, a wheel hub 3 is rotatably supported via a pair of tapered roller bearings 2 and 2, and is fixed in the axial direction by a center nut 4. Six hub bolts 5 are implanted in a flange portion 3a formed at the outer end of the wheel hub 3 in parallel with the axle 1a. A brake drum 7 is fixed to the inner side (left side in FIG. 1) of the flange portion 3a by a nut 6 screwed into the hub bolt 5 on the inner end side. A pad of a brake device (not shown) is disposed on the inner peripheral side of the cylindrical brake drum 7, and exerts a braking force by contacting the inner periphery of the brake drum 7.

  On the other hand, a wheel 9 is attached to the outer side in the axial direction of the flange portion 3 a of the wheel hub 3 (right side in FIG. 1) by a wheel nut 8 screwed to the outer end side of the same hub bolt 5. A wheel 10 is mounted around the wheel 9.

  A rotor 11 is attached to the outer periphery of the brake drum 7. The rotor 11 is attached to the outer edge of the brake drum 7 with an inlay (A) and is fixed with a bolt, and is a cylindrical rotor holder 11a, and a rotor core 11b attached to the inner periphery of the rotor holder 11a. Consists of. The rotor holder 11a has a screw hole 11c on its side surface.

  A stator 12 is attached to the bracket 1. The stator 12 includes a cylindrical stator holder 12a fixed to a bracket, and a stator core 12b attached to the outer periphery of the stator holder 12a so as to face the rotor core 11b in the radial direction. Consists of. The radial gap between the rotor core 11b and the stator core 12b is 0.5 to 2 mm. The rotor 11 and the stator 12 are superposed on the inner side in the radial direction of the wheel 10.

  The operation of the in-wheel motor unit in FIG. 1 will be described. For example, when the driver depresses an accelerator pedal (not shown), a high-frequency current is transmitted from the inverter unit (not shown) to the coil of the stator 12, thereby generating a magnetic force between the rotor 11 and the magnetic force. The wheel 10 can be rotationally driven by rotating the wheel 9 by using.

  FIG. 2 is a perspective view of the in-wheel motor unit jig. FIG. 3 is a cross-sectional view showing the in-wheel motor unit jig assembled to the in-wheel motor unit. 4 is a view of the in-wheel motor unit jig of FIG. 3 as viewed in the direction of arrow IV.

  In FIG. 2, in the in-wheel motor unit jig 100, a base 101 includes a donut disk-shaped fixed portion 101a, a boss 101b provided at the center of the fixed portion 101a, an outer periphery of the boss 101b, and an inner portion of the fixed portion 101a. It has the connection part 101c which connects circumference | surroundings in three places. On the fixed portion 101a, three shafts 102 are fixed at equal intervals, and six through holes 101d are provided at equal intervals.

  The shaft 102 penetrates the moving part 103 and extends upward. The moving part 103 has a configuration in which an upper disk part 103a and a lower disk part 103b having a larger diameter are connected by a connecting part 103c. The upper disk portion 103a is provided with three cylindrical bushes 103d at equal intervals, and the shaft 102 penetrates through the shaft 102 so as to be relatively slidable. The shaft 102 and the bush 103d constitute a guide part.

  A nut 104 is disposed at the center of the upper disk portion 103a. Three connecting portions 103e extend at equal intervals from the inner circumference of the upper disk portion 103a inward in the radial direction. As shown in FIG. 3, the inner end of the connecting portion 103e is connected to the outer periphery of the nut 104 by a bolt B1. In addition, four through holes 103f are formed at equal intervals in the lower disk portion 103b. The lower disk portion 103b is configured to be removable from the upper disk portion 103a with a bolt or the like, and a plurality of types of lower disk portions 103b having different diameters are prepared. In addition, the in-wheel motor unit jig 100 having high versatility can be provided by selectively attaching the lower disk portion 103b having an appropriate diameter.

  In FIG. 2, the lower end of the screw shaft 105 is rotatably supported by the boss 101b of the base 101 by a bearing unit 110 (see FIG. 3). The screw shaft 105 extends upward, penetrates the nut 104 with a ball (not shown) interposed therebetween, and is supported by a support unit 106 disposed above the moving unit 103. A nut 104 and a screw shaft 105, which are ball screw mechanisms that convert rotational motion into axial motion, constitute a drive unit.

  The support portion 106 is made of a plate material extending in three directions radially outward from the center, and the outer end portions of the three shafts 102 are respectively nuts N1 screwed into the upper ends thereof. It is fixed. In the center of the support portion 106, a bearing unit 107 is fixed by a bolt B2. The bearing unit 108 rotatably supports the screw shaft 105 with respect to the support portion 106. An end portion of the screw shaft 105 protruding upward from the support portion 106 can be engaged with the handle 107 so as not to be relatively rotatable with a key or the like. That is, when the handle 107 is rotated in a state of being engaged with the end of the screw shaft 105, the moving unit 103 moves in any one of the axial directions with respect to the base 101.

  Next, an aspect in which the rotor 11 is disassembled or incorporated from the stator 12 using the in-wheel motor unit jig 100 will be described. When disassembling the rotor 11 from the stator 12 from the mounting state on the vehicle shown in FIG. 1, first, the wheel nut 8 is loosened and the wheel 9 and the wheel 10 are removed. Also, a bolt (not shown) for connecting the brake drum 7 and the rotor 11 is removed. However, since the brake drum 7 and the rotor 11 are inlayed (A), the rotor 11 is eccentrically fixed. There is no interference with the child 12.

  From this state, as shown in FIG. 3, the base bolt 101 is fixed to the wheel hub 3 by inserting the hub bolt 5 into the through hole 101d of the base 101 of the in-wheel motor unit jig 100 and tightening the nut N2. . Further, the bolt B3 is inserted through the through hole 103f formed in the lower disk part 103b of the moving part 103 and screwed into the screw hole 11c of the rotor 11. As a result, the rotor 11 is fixed to the moving unit 103.

  Thereafter, when the handle 107 is engaged with the end of the screw shaft 105 and the screw shaft 105 is rotated by the operator's hand, the rotational motion is converted into the axial motion of the nut 104. Then, the moving part 103 moves in the axial direction (rightward in FIG. 3) together with the nut 104 with respect to the base part 101, and the rotor 11 moves relative to the stator 12 in the axial direction. At this time, the moving part 103 is guided by the shaft 102 via the bush 103d and maintains the rotor 11 and the stator 12 coaxially, so that the rotor 11 comes into contact with the stator 12. And can be extracted against the magnetic force generated in the meantime. If the rotor 11 is completely extracted from the stator 12, maintenance or the like of the stator 12 can be performed. In addition, what is necessary is just to take the procedure contrary to the above, when incorporating the rotor 11. FIG.

  As described above, according to the in-wheel motor unit jig 100 of the present embodiment, the moving portion 103 with respect to the base portion 101 is maintained while the stator 12 and the rotor 11 are maintained coaxially by the shaft 102 and the bush 103d. Since the moving portion 103 is driven in the axial direction of the stator 12 or the rotor 11 through the ball screw mechanism, the moving portion 103 is rotated with respect to the stator 12 via the ball screw mechanism. The child 11 can be relatively moved in the axial direction against the magnetic force in a non-contact state, whereby the stator 12 and the rotor 11 can be easily incorporated or disassembled even in an actual vehicle.

  As described above, the present invention has been described in detail with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be appropriately changed and improved without departing from the spirit thereof. Of course there is. For example, the screw shaft may be rotated by a motor or the like.

It is sectional drawing which shows the in-wheel motor unit which can apply this Embodiment in the state assembled | attached to the vehicle. It is a perspective view of the jig for in-wheel motor units. It is sectional drawing shown in the state assembled | attached to the in-wheel motor unit with the jig | tool for in-wheel motor units. It is the figure which looked at the jig for in-wheel motor units of Drawing 3 in the direction of arrow IV.

Explanation of symbols

1 Bracket 1a Axle 2, 2 Bearing 3 Wheel hub 3a Flange 4 Center nut 5 Hub bolt 6 Nut 7 Brake drum 8 Wheel nut 9 Wheel 10 Wheel 11 Rotor 11a Rotor holder 11b Rotor core 11c Screw hole 12 Stator 12a Fixed Child holder 12b Stator core 100 In-wheel motor unit jig 101 Base 101a Fixing portion 101b Boss 101c Connection portion 101d Through hole 102 Shaft 103 Moving portion 103a Upper disk portion 103b Lower disk portion 103c Connection portion 103d Bush 103e Connection portion 103f Through Hole 104 Nut 105 Screw shaft 106 Support portion 107 Handle 108, 110 Bearing unit B1 Bolt B2 Bolt B3 Bolt N1 Nut N2 Nut

Claims (2)

A stator that is fixed to the vehicle body side, and a rotor that is attached to rotate integrally with a wheel of the wheel, and the stator that overlaps in a radial direction and at least a part of the rotor are the wheels. In-wheel motor unit jig for assembling and disassembling the in-wheel motor unit arranged on the inner side in the radial direction of
A base attached to the stator side;
A moving part attached to the rotor;
A guide part for guiding the moving part relative to the base part while maintaining the stator and the rotor coaxially;
An in-wheel motor unit jig comprising: a drive unit that drives the moving unit in the axial direction of the stator or the rotor with respect to the base.   The in-wheel motor unit jig according to claim 1, wherein the drive unit includes a screw shaft and a nut.

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