JP2005329905A - In-wheel motor system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To let a linear guide part have suitable sealing function while sufficiently keeping function of a dynamic damper in an in-wheel motor system having a constitution that a motor is operated as a dynamic damper. <P>SOLUTION: The in-wheel motor system having a constitution that a stator of an in-wheel motor is elastically supported to a knuckle through a shock-absorbing mechanism provided with a linear guide 11 and a rotor and a wheel are bonded by an oldham coupling. The linear guide 11 is covered with a dust-prevention cover 30 provided with vertical pieces 30a, 30b for covering a side surface outer peripheral part of the linear guide 11 including an operation direction end surface of the linear guide 11 and a horizontal piece 30c projected from the vertical piece 30a to a guide body 11A direction and covering a guide rail surface 11m parallel to the operation direction of the linear guide 11 and not contacted with the linear guide 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an in-wheel motor system that is used in a vehicle having a direct drive wheel as a driving wheel, and is configured by attaching a motor to an underbody part via a shock absorber provided with a linear guide. It relates to a dustproof structure.

In recent years, in vehicles driven by a motor, a driving motor is supported on a lower part of a vehicle spring such as a knuckle via an elastic body and / or a damping mechanism, thereby acting as the dynamic damper, and an in-wheel motor-equipped vehicle. A technique for improving the ground contact property and the ride comfort has been proposed (see, for example, Patent Documents 1 to 3).
In general, in a vehicle having a suspension mechanism such as a spring around the undercarriage, when the mass of parts corresponding to unsprung parts such as wheels, knuckle parts, suspension arms, or the so-called unsprung mass is larger, the vehicle travels on uneven roads. Because the unsprung part vibrates greatly in the vertical direction, which deteriorates the load holding property, as described above, if a motor with a large mass is used as a dynamic damper to suppress vertical vibration, the grounding of the vehicle The performance can be greatly improved.

In order to use an in-wheel motor as a dynamic damper, for example, the motor is mounted on a vehicle via a spring and a damper. At this time, a rotational reaction force acts on the stator portion that drives the motor. In order to simultaneously realize the rotation stop and the vertical guide of the motor, it is necessary to provide a linear guide in addition to the spring and the damper.
Further, since the motor acts as a dynamic damper in the wheel, a relative displacement occurs between the wheel shaft and the motor shaft. In order to absorb this displacement and transmit the rotation of the motor smoothly to the wheel, an Oldham coupling is formed by using a plurality of cross guides that combine linear guides at right angles, thereby transmitting power while absorbing eccentricity. Is realized.
FIG. 8 is a diagram showing an example of the configuration of the stator-side case 3a that supports the stator 3S of the hollow direct drive motor 3, and the operation direction is limited to the vertical direction of the vehicle with respect to each other via the linear guide 11. A rotor that supports the rotor 3R and elastically supports the knuckle 5 via a buffer mechanism 10 including two plates 14 and 15 coupled by a spring 12 and a damper 13 that operate in the vertical direction of the vehicle. The side case 3b and the wheel 2 are coupled to a coupling mounting plate 21 attached to the rotor side case 3b of the motor, and a plurality of cross guides 22 are connected between the plate 21 and the wheel 2 and whose operating directions are orthogonal to each other. Are connected by an Oldham coupling 20 with
As a result, the motor 3 can be elastically supported with respect to the knuckle 5 that is a vehicle undercarriage component, and the torque can be efficiently transmitted to the wheel 2 and can be swung only in the vertical direction. It is possible to improve the load holding property of the vehicle by reducing the tire ground load fluctuation.
International Publication No. 02/83446 Pamphlet Japanese Patent Laid-Open No. 2004-090696 JP 2004-090699 A

By the way, since the said in-wheel motor 3 is used outdoors, dust may adhere to linear guides used for in-wheel motor systems, such as the above-mentioned linear guide 11, and there exists a possibility of inhibiting the operativity of a linear guide. .
Therefore, in order to prevent this, it is necessary to completely seal the linear guide portion. However, if the linear guide is covered with, for example, a rubber-like bellows, the elasticity of the bellows serves as a dynamic damper. There arises a problem that the characteristics are disturbed.

  The present invention has been made in view of the conventional problems, and in an in-wheel motor system in which the motor acts as a dynamic damper, the linear guide portion has an appropriate sealing function while sufficiently maintaining the function of the dynamic damper. The purpose is to have it.

  According to the first aspect of the present invention, the stator side of the hollow direct drive motor provided in the wheel portion is elastically supported via a shock absorber provided with a linear guide with respect to the underbody part of the vehicle. In the in-wheel motor system having the above-described configuration, the dust guide of the linear guide is provided with dustproof means including a guide rail surface parallel to the linear guide operation direction and a dustproof cover that covers the guide end surface, including the guide body of the linear guide. Is to do.

Further, the invention according to claim 2 is the in-wheel motor system according to claim 1, in addition to the dustproof cover, both end sides thereof are respectively attached to both end faces perpendicular to the guide operating direction of the guide body. A dustproof belt that covers the guide rail of the linear guide is provided.
According to a third aspect of the present invention, in the in-wheel motor system according to the second aspect, the dust-proof belt is disposed so as to pass through the back side of the guide rail.
According to a fourth aspect of the present invention, in the in-wheel motor system according to the third aspect, rollers for guiding the dustproof belt are provided at both ends of the guide rail.

The invention according to claim 5 is the in-wheel motor system according to any one of claims 1 to 4, wherein the motor is a linear guide or spring whose operating direction is limited in the vehicle vertical direction. And a knuckle connected by a shock absorber provided with a damper.
According to a sixth aspect of the present invention, in the in-wheel motor system according to the fifth aspect, the rotor and the wheel of the motor are connected by a plurality of cross guides in which linear guides are orthogonally combined.

According to the present invention, in the in-wheel motor system in which the stator side of the hollow direct drive motor provided in the wheel portion is elastically supported to the underbody parts of the vehicle via the shock absorber provided with the linear guide. Dust-proof means with dust-proof cover that covers the guide rail surface parallel to the linear guide operating direction, including the linear guide body, and the guide end surface is provided to protect the linear guide. It is possible to prevent dust and to ensure the operability of the linear guide. Therefore, the linear guide portion can be reliably protected from dust while sufficiently maintaining the function of the dynamic damper.
In addition, a dustproof belt is provided to cover the guide rail of the linear guide, and both ends are attached to both end faces orthogonal to the guide operating direction of the guide body. The property can be further improved.
At this time, if the dust-proof belt is disposed so as to pass through the back side of the guide rail, and the rollers for guiding the dust-proof belt are provided at both ends of the guide rail, the movement of the dust-proof belt becomes smoother. Therefore, the function of the dynamic damper can be fully exhibited.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of an in-wheel motor system according to the first embodiment, in which 1 is a tire, 2 is a wheel composed of a rim 2a and a wheel disc 2b, and 3 is a radial direction. A motor stator (hereinafter referred to as “stator”) 3S fixed to a stator side case 3a provided on the inner side, and provided on the outer side in the radial direction so as to be rotatable with respect to the stator side case 3a via a bearing 3j. An outer rotor type in-wheel motor having a motor rotor (hereinafter referred to as a rotor) 3R fixed to the joined rotor-side case 3b, 4 is a hub portion connected to the wheel 2 and its rotating shaft, and 5 is a suspension arm. 6 is a knuckle that is an undercarriage part of the vehicle, 7 is a suspension member such as a shock absorber, 8 A brake mounted on the hub unit 4.
Further, 10 is a buffer mechanism for elastically supporting the stator side case 3a of the motor to the knuckle 5, 20 is an Oldham coupling for coupling the rotor side case 3b of the motor and the wheel 2, and 30 is a linear guide according to the present invention. 11 is a dust-proof cover which is 11 dust-proof means.

  As shown in FIG. 2, the shock absorber mechanism 10 is connected by a spring 12 and a damper 13 whose operation directions are limited to each other in the vertical direction of the vehicle via four linear guides 11 and that operate in the vertical direction of the vehicle. The in-wheel motor 3 is attached to the knuckle 5 by connecting the motor side plate 14 to the stator side case 3a of the motor and connecting the knuckle side plate 15 to the knuckle 5. It can elastically support the knuckle 5 which is a rotating part. Therefore, since the in-wheel motor 3 is floating-mounted with respect to the vehicle unsprung part, the motor shaft can swing separately from the wheel shaft. For this reason, the motor mass is separated from the mass under the vehicle spring, and acts as a so-called dynamic damper weight. The weight of the dynamic damper cancels out the unsprung vibration when running on uneven roads, so that the tire grounding force fluctuation is reduced, the grounding property of the vehicle is improved, and the riding comfort performance is greatly improved.

The Oldham coupling 20 has a hollow disk-like coupling attachment plate 21 attached to the rotor-side case 3b of the motor, and a coupling between the coupling attachment plate 21 and the wheel 2, and the operation direction is front and back. As shown in FIG. 3, the cross guide 22 includes a motor side guide rail 22 </ b> A attached to the plate 21 and a wheel side attached to the wheel 2. A guide rail 22B and a cross guide main body 22C provided with guide grooves 22a and 22b on the upper surface and the lower surface, respectively. The motor side guide rail 22A and the wheel side guide rail 22B of the cross guide 22 can operate in directions orthogonal to each other along the guide grooves 22a and 22b of the cross guide body 22C.
Therefore, by connecting the rotor side case 3b and the wheel 2 by the Oldham coupling 20 as described above, even when an eccentricity occurs between the wheel shaft and the motor shaft, the guide rail of the cross guide 22 is used. Since 22A and 22B can slide and absorb the eccentricity, the rotational force of the motor 3 can be efficiently transmitted to the wheel 2 even if the wheel shaft and the motor shaft are displaced.

Next, the linear guide 11 and the dustproof cover 30 which is a dustproof means for the linear guide 11 will be described.
FIG. 4 is a diagram showing a configuration example of the linear guide 11. The linear guide 11 includes a guide body 11A including circulation paths 11a and 11a through which a plurality of steel balls 11r circulate, and the steel balls 11r. A guide rail member 11B in which a rail portion 11R having a rolling surface (side surface) that rolls is formed, and covers the periphery of the linear guide 11 that is a combination of the guide body 11A and the guide rail member 11B. Thus, the dustproof cover 30 is arranged.
As shown in FIGS. 5 to 7, the dust-proof cover 30 covers the outer periphery of the side surface of the linear guide 11 including the end surface in the operation direction of the linear guide 11 and extends in the operation direction of the linear guide 11. , 30a, vertical pieces 30b, 30b extending in a direction orthogonal to the guide operating direction, and projecting from the vertical pieces 30a, 30a in the direction of the guide body 11A and covering the guide rail surface parallel to the operating direction of the linear guide 11 The horizontal pieces 30c and 30c are extended to a position in contact with the side surface of the guide body 11A. Thereby, intrusion of dust from the side surface of the linear guide 11 can be prevented, and intrusion of dust to the guide rail surface 11m located outside the guide body 11A can be prevented. In addition, since the dustproof cover 30 does not contact the linear guide 11, the linear guide portion can be reliably dustproofed while maintaining the function of the dynamic damper sufficiently.

In this example, as shown in FIGS. 5 to 7, a dustproof belt 31 having a width substantially the same as the width of the guide body 11A is attached to one end surface orthogonal to the operating direction of the guide body 11A. The other end surface of the belt 31 is passed through the back surface side of the guide rail member 11B through a gap (not shown) of the holding member 32 that holds the guide rail member 11B, and the other end surface orthogonal to the operating direction of the guide body 11A. Therefore, when the linear guide 11 is in operation, all of the moving surface of the guide body 11A of the guide rail surface 11m including the rail portion 11R can be covered, so that the dustproof property of the linear guide 11 is further improved. be able to.
At this time, if the roller 33 for guiding the dustproof belt 31 is provided on the end surface side of the guide rail member 11B in the operation direction, the movement of the dustproof belt 31 can be further smoothed. As a result, the function of the dynamic damper can be fully exhibited.

Thus, according to the best mode, the stator side case 3a that supports the stator 3S of the in-wheel motor 3 is elastically supported with respect to the knuckle 5 via the buffer mechanism 10 including the linear guide 11, and the rotor In the in-wheel motor system having a configuration in which the rotor side case 3b supporting the 3R and the wheel 2 are coupled by the Oldham coupling 20 with a plurality of cross guides 22, the linear guide 11 including the operation direction end face of the linear guide 11 is provided. The vertical pieces 30a and 30b covering the outer periphery of the side surface, and the horizontal pieces 30c protruding from the vertical piece 30a in the direction of the guide body 11A and covering the guide rail surface 11m parallel to the operation direction of the linear guide 11, Cover the linear guide 11 with a dust-proof cover 30 that does not contact the linear guide 11. Since, it is possible to prevent dust from entering the linear guide 11, while fully maintaining the function of the dynamic damper can be reliably dustproof linear guide portion.
At this time, both end portions are attached to both end surfaces orthogonal to the guide operation direction of the guide body 11A, and a dust-proof belt 31 is provided to cover the guide rail member 11B of the linear guide 11, and the dust-proof belt 31 is attached to the guide body. Since the guide rail surface 11m of the guide rail member 11B can be reliably covered by arranging the rail member 11B so as to pass through the back surface side, the dust resistance of the linear guide portion can be further improved. Furthermore, if the roller 33 for guiding the dustproof belt 31 is provided, the movement of the dustproof belt 31 becomes smoother, so that the function of the dynamic damper can be sufficiently exhibited.

  In the best mode, a guide body 11A having two circulation paths 11a and 11a through which the steel ball 11r circulates and a rail portion 11R having a rolling surface on which the steel ball 11r rolls are formed. Although the linear guide 11 provided with the guide rail member 11B has been described, the present invention is not limited to this, and the linear guide dustproof means of the present invention includes a linear guide provided with a guide body having a track-like circulation path, The present invention can also be applied to an in-wheel motor system including a linear guide having another configuration.

  Thus, by using the dustproof means of the linear guide of the present invention, the linear guide portion can be reliably dustproofed while maintaining the function of the dynamic damper sufficiently, so that the reliability of the in-wheel motor system is improved. be able to.

It is a longitudinal section showing the composition of the in-wheel motor system concerning the best form of the present invention. It is a figure which shows the structure of the buffer mechanism which concerns on this best form. It is a figure which shows the structure of the cross guide which concerns on this best form. It is a perspective view which shows the linear guide and dustproof cover which concern on this best form. It is a front view which shows a linear guide and a dustproof cover. It is a side view which shows a linear guide and a dust cover. It is a top view which shows a linear guide and a dust cover. It is a longitudinal cross-sectional view which shows the structure of the conventional in-wheel motor system.

Explanation of symbols

1 tire, 2 wheel, 2a rim, 2b wheel disc,
3 In-wheel motor, 3R motor rotor, 3S motor stator,
3a Stator side case, 3b Rotor side case, 3j Bearing, 4 Hub part,
5 knuckle, 6 suspension arm, 7 suspension member, 8 brake,
10 buffer mechanism, 11 linear guide, 11A guide body,
11B guide rail member, 12 spring, 13 damper, 14 motor side plate,
15 knuckle side plate, 20 Oldham coupling,
21 coupling mounting plate, 22 cross guide,
22A Motor side guide rail, 22B Wheel side guide rail,
22C Cross guide body, 30 dustproof cover, 31 dustproof belt, 32 holding member,
33 Laura.

Claims (6)

  In the in-wheel motor system having a configuration in which a stator side of a hollow direct drive motor provided in a wheel portion is elastically supported via a shock absorber provided with a linear guide with respect to a vehicle suspension part, the linear guide An in-wheel motor system comprising a dust-proof means including a guide rail surface parallel to the operation direction of the linear guide and a dust-proof cover that covers the guide end surface.   2. The dust-proof belt according to claim 1, further comprising a dust-proof belt that covers the guide rails of the linear guide, both ends of which are respectively attached to both end faces perpendicular to the guide operating direction of the guide body. The in-wheel motor system described.   The in-wheel motor system according to claim 2, wherein the dustproof belt is disposed so as to pass through a back surface side of the guide rail.   4. The in-wheel motor system according to claim 3, wherein rollers for guiding the dustproof belt are provided at both ends of the guide rail.   5. The motor according to claim 1, wherein the motor is attached to the knuckle by a shock absorber provided with a linear guide, a spring, and a damper whose operation direction is limited in a vehicle vertical direction. In-wheel motor system.   6. The in-wheel motor system according to claim 5, wherein the rotor and the wheel of the motor are connected by a plurality of cross guides in which linear guides are orthogonally combined.

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