JP4789628B2 - In-wheel motor system - Google Patents

Description

  The present invention relates to an in-wheel motor system used in a vehicle having a direct drive wheel as a driving wheel, and in particular, an in-wheel having a configuration in which the motor is supported to a vehicle suspension part via a buffer mechanism. It relates to a motor system.

In recent years, an in-wheel motor system in which a motor is built in a wheel is being adopted in a vehicle driven by a motor such as an electric vehicle. Among them, an in-wheel motor system configured to elastically support the in-wheel motor 3 with respect to a vehicle underbody component via a buffer mechanism 50 as shown in FIG. 1). More specifically, the in-wheel motor system includes a rotation-side case 3b to which a motor rotor 3R is attached, the radially inner side being opened, and a concentric arrangement with the rotation-side case 3b, and a predetermined distance from the motor rotor 3R. The non-rotating side case 3a of the hollow in-wheel motor 3 that is rotatably connected to the non-rotating side case 3a, to which the motor stator 3S is attached with a radial outer side open, is supported via a bearing 3j. As shown in FIG. 5, an axle is provided via a buffer mechanism 50 having a linear motion guide 51A composed of a linear bearing 51a and a rod 51b and a spring direct motion guide 51 integrally formed with spring members 51B and 51B. 6 is connected to a knuckle 5 which is an undercarriage part of a vehicle to be coupled to 6, and the rotation side case 3b and the wheel 2 are Those linked by a flexible coupling 60 are mutually eccentric possible driving force transmission mechanism in the direction.
In FIG. 4, 1 is a tire attached to the wheel, 4 is a hub part connected to the wheel 2 and its rotating shaft, 7 is a suspension member made of a shock absorber, etc., and 8 is attached to the hub part 4. Brake device.

As shown in FIG. 6, the buffer mechanism 50 includes a motor-side plate 52 attached to the non-rotating side case 3 a of the in-wheel motor 3 and a knuckle-side plate 53 connected to the knuckle 5. The moving guide 51 and the cylinder 54a are connected by a damper 54 including a piston (not shown) and a shaft 54b connected to the piston. Specifically, the knuckle side plate 53 is provided with fixing members 53m and 53n. Te fixed to the cylinder 54a of the linear bearing 5 1 a and the damper 54 is a fixed part of the spring with the linear motion guide 51, fixed to the motor-side plate 52 member 52n, the spring-loaded linear guides 51 provided 52n It becomes the structure which fixes the front-end | tip part of the rod 51b which is a movable part, and the front-end | tip part of the shaft 54b of the damper 54. That.
In this way, by adopting a configuration in which the in-wheel motor 3 is elastically supported with respect to the undercarriage part of the vehicle via the buffer mechanism 50, the motor 3 is floating-mounted with respect to the undercarriage part of the vehicle. Therefore, the in-wheel motor 3 itself can act as a weight of the dynamic damper, and both the ground contact performance and the riding comfort performance when traveling on a rough road can be greatly improved.
JP 2005-178684 A

  However, the conventional buffer mechanism 50 including the linear guide 51 with a spring and the damper 54 has a dynamic damper effect for an input when traveling on a general road surface with relatively little unevenness. Since the characteristics are set, if there is an excessive input from the road surface, the in-wheel motor 3 may move too much and hit the wheel 2 and break down.

  The present invention has been made in view of the conventional problems, and an object thereof is to provide an in-wheel motor system in which a stopper member capable of effectively regulating the amount of vertical displacement of the buffer mechanism is arranged. .

The invention according to a first aspect of the present invention, the in-wheel motor that includes a annular arranged at a prescribed interval radially inside the annular rotor and the upper Symbol rotor motor stator, the motor stator an annular non-rotating side case for housing and supporting the linear guide and the knuckle is on the Symbol non-rotating side case have a spring-loaded linear guide configured integrally with the spring member at the vehicle underbody parts in-wheel motor system comprising a buffering mechanism, the buffering mechanism in a vehicle upper side and lower side of the knuckle side plate for fixing to the knuckle, and, respectively a position away from the spring with linear guide is in the protruding portion, a position opposed to the protruding portions, respectively on the inner peripheral side of the non-rotating side case mounting projecting toward the non-rotating side case And a stopper rubber that is obtained by so as to restrict the maximum displacement of the buffer mechanism.
According to a second aspect of the present invention, in the in-wheel motor system according to the first aspect, the distance in the vehicle front-rear direction between the position of the protrusion (position where the stopper rubber is attached) and the position of the center of gravity of the motor is set to The inner radius of the rotation side case is less than half.
According to a third aspect of the present invention, there is provided the in-wheel motor system according to the first or second aspect, wherein the hollow disk-shaped rib member protruding radially inward from the inner peripheral side of the non-rotating side case is provided. The upper and lower receiving portions of the linear guide with spring are fixed to the rib member, and the stopper rubber is attached to each of the upper and lower receiving portions.

According to the present invention, an in-wheel motor is supported via a buffer mechanism having a spring-equipped linear motion guide in which a linear motion guide and a spring member are integrally formed with respect to a knuckle that is a vehicle suspension part. In the in-wheel motor system, a non-rotation of the motor that houses the motor stator on the vehicle upper side and lower side of the knuckle side plate for fixing the buffer mechanism to the knuckle and at a position away from the linear guide with spring A protrusion that protrudes toward the side case is provided, and a stopper rubber such as a rubber bush is attached to the inner peripheral side of the non-rotating side case so as to face the upper surface and the lower surface of the protrusion. since so as to regulate the maximum displacement of the mechanism, with a simple structure, while ensuring the space in the axial direction, the maximum amount of vertical displacement of the cushioning mechanism It can be easily regulated.
At this time, if the distance in the vehicle front-rear direction between the position of the protrusion (stopper rubber) and the position of the center of gravity of the motor is less than half of the inner radius of the non-rotating side case, the maximum displacement amount of the buffer mechanism is restricted. In addition, the impact input to the linear motion guide when the protrusion and the stopper rubber collide can be reduced.
In addition, a hollow disc-shaped rib member protruding radially inward from the inner peripheral side of the non-rotating side case is provided, and the upper and lower receiving portions of the spring-loaded linear guide are respectively fixed to the rib member, and If the protrusion is provided on the knuckle side plate and the stopper rubber is attached to each of the upper and lower receiving portions, the motor side plate can be omitted, so that the buffer mechanism can be reduced in size and weight.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIGS. 1A and 1B are views showing a state in which a buffer mechanism 10 used in the in-wheel motor system according to the best mode is attached to the in-wheel motor 3, in which 11 is an axle (not shown) A knuckle side plate 12 connected to a knuckle 5 which is an undercarriage part of a vehicle connected to a linear motion guide 12A having a linear bearing 12a and a rod 12b and a spring member 12B integrally formed with a spring. A guide 13 is a second linear motion guide arranged in parallel with the spring-equipped linear motion guide 12, and a linear bearing 12 a that is a fixed portion of the spring linear motion guide 12 and the linear motion of the second linear motion guide 13. A bearing (not shown) is fixed to a fixing member 11m attached to the knuckle side plate 11, and the rod 12b which is the movable portion and the rod Tip of 3b are top, under the guiding receiving member 14A, through 14B, are respectively attached to a non-rotating side case 3a of the motor 3. Reference numeral 15 denotes a single rod type damper composed of a cylinder 15a, a piston, and a shaft 15b connected to the piston. A cylinder 15a, one end of which is a fixing portion, is fixed to a fixing member 11n attached to the knuckle side plate 11. The tip of the shaft 15b, which is a movable part, is attached to the non-rotating side case 3a via a damper receiving member 16. Note that the knuckle 5 is omitted in FIG.

In this example, the upper and lower sides of the knuckle side plate 11 protrude in the vertical direction at positions separated from the center of the plate by L = 0.2R (R: inner radius of the non-rotating side case) in the longitudinal direction of the vehicle. And a hemispherical shape that functions as a stopper rubber at a position corresponding to the upper and lower surfaces of the protrusions 17A and 17B of the upper and lower guide receiving members 14A and 14B. The rubber bushes 18A, 18B are attached, and the protrusions 17A, 17B and the rubber bushes 18A, 18B constitute a stopper mechanism to suppress the maximum displacement amount of the buffer mechanism 10.
Thus, even when a large vibration is input to the tire, the relative displacement in the vertical direction of the shock absorber 10 with respect to the in-wheel motor 3 is caused by the hemispherical rubber bushes 18A and 18B coming into contact with the protrusions 17A and 17B. Therefore, the buffer mechanism 10 is not displaced further upward or downward. Therefore, since the clearance between the wheel 2 and the in-wheel motor 3 can be kept below a predetermined value, excessive deformation of the in-wheel motor 3 can be suppressed and damage to the in-wheel motor 3 can be prevented.
At this time, as shown in FIGS. 2A and 2B, a hollow disk-like rib member 20 protruding radially inward is provided on the inner peripheral side of the non-rotating side case 3a of the motor to reinforce the motor case. In addition, the rib member 20 is provided with notches 20k for arranging the upper and lower guide receiving members 14A and 14B, and the guide receiving members 14A and 14B are respectively provided in the notches 20k. If it is set as the structure attached, compared with the conventional buffer mechanism 50 shown in FIG. 4, while being able to ensure sufficient space of an axial direction, the stroke width of the buffer mechanism 10 can be fully ensured.
Specifically, the guide receiving members 14A and 14B are inserted into and fixed to the distal ends of the rods of the linear guide 12 with spring and the linear guide 13 and the notch 14a. It comprises arcuate mounting portions 14b and 14c for mounting on both sides of 20k, and the mounting portions 14b and 14c are mounted on both sides of the cutout portion 20k with the receiving portion 14a fitted in the cutout portion 20k. By fixing to the rib member 20, the stroke width of the buffer mechanism 10 can be sufficiently ensured.

Further, the rubber bushes 18A, 18B are fixed to a mounting hole 14h provided on a surface 14d corresponding to the protrusions 17A, 17B of the attachment part 14b on the protrusions 17A, 17B side of the receiving members 14A, 14B. do it.
At this time, the distance L in the vehicle front-rear direction between the mounting position of the protrusions 17A and 17B and the rubber bushes 18A and 18B and the center of gravity of the motor (in this example, the center of the knuckle side plate 11) is defined as the non-rotating side case 3a. When it is assumed that the inner radius is R, it is important that L ≦ 0.5R. Thus, when the protrusions 17A and 17B collide with the rubber bushes 18A and 18B, the linear motion with the spring is performed. The impact force input to the linear motion guide 12A and the linear motion guide 13 of the guide 12 can be reduced. That is, the moment input due to the motor inertia force to the linear motion guides 12A and 13 at the time of impact is proportional to the motor mass, the input vertical acceleration, and the motor center-of-gravity-stopper distance. For example, as shown in FIG. in case of providing the protruding portions 17M to the ends of the longitudinal vehicle knuckle side plate 11, the projection portion 17M is requires a single, motor centroid - would stopper distance L _s is longer, as a result, linear motion The impact force input to the guide 12A and the linear motion guide 13 is increased. Therefore, it is preferable to reduce the impact input to the linear motion guide 12A and the linear motion guide 13 by reducing the distance L to L = 0.2R as in this example.

Thus, according to this best mode, the hollow disk-shaped rib member 20 protruding radially inward is provided on the inner peripheral side of the non-rotating side case 3a of the in-wheel motor 3, and the rib member 20 is further provided with the rib member 20. A notch portion 20k is provided to receive the rod 12b, which is the movable portion of the linear guide 12 with the spring, the spring member 12B, and the rod of the linear guide 13, and the lower guide receiving members 14A and 14B to the notch. Protrusions 17A and 17B are provided on the upper and lower parts of the knuckle-side plate 11 and provided in the upper part and the lower part of the knuckle-side plate 11, and the protrusions 17A of the upper and lower guide receiving members 14A and 14B are provided. , 17B, hemispherical rubber bushes 18A, 18B functioning as stopper rubbers are respectively attached to the positions corresponding to the upper and lower surfaces of the protrusions 17A, 17B. Since the rubber bush 18A, 18B constitutes a stopper mechanism and the maximum displacement amount of the buffer mechanism 10 is suppressed, the clearance between the wheel 2 and the in-wheel motor 3 can be kept below a predetermined value, Excessive deformation of the in-wheel motor 3 can be suppressed.
At this time, if the distance between the position of the protrusions 17A and 17B and the center of the knuckle side plate 11 is set to be less than half the inner radius of the non-rotating side case 3a, the protrusions 17A and 17B and the above When the rubber bushes 18A and 18B collide, the impact force input to the linear motion guide 12A and the linear motion guide 13 of the linear motion guide 12 with the spring can be effectively reduced.

In the best mode, the center of gravity position of the in-wheel motor 3 is the center position of the knuckle side plate 11. However, depending on the shape of the knuckle side plate 11, the center position of the knuckle side plate 11 may be the center position of the motor. It may be different. At that time, the distance L may be a distance from the center of gravity of the in-wheel motor 3.
In the above example, the protrusions 17A and 17B are provided at a position of L = 0.2R (R: inner radius of the non-rotating side case 3a) from the center of the knuckle side plate 11, but this is not restrictive. . That is, a smaller value of the distance L is preferable, but generally, the vicinity of the center of the knuckle side plate 11 is cut out for light weight and space efficiency. If it is provided at the center, the lengths of the projecting portions 17A and 17B become longer, which may obstruct piping and reduce the weight. Therefore, the value of L needs to be appropriately determined in the range of L ≦ 0.5R in consideration of the configuration of the shock absorber 10 and space efficiency.
In the above example, the shock absorbing mechanism 10 including the linear motion guide 12 with the spring, the linear motion guide 13 and the damper 15 has been described. However, the present invention includes the conventional linear motion guide 12 with the spring and the damper 15. Needless to say, the present invention can also be applied to an in-wheel motor system equipped with the buffer mechanism 50.
Instead of the stopper mechanism, hemispherical rubber bushes 18A and 18B are attached to the upper and lower surfaces of the protrusions 17A and 17B, and the rubber bushes 18A and 14B of the upper and lower guide receiving members 14A and 14B are attached. The same effect can be obtained by using a stopper mechanism having a structure in which bars extending in the direction of the protrusions 17A and 17B are provided from a position facing 18B.

  As described above, according to the present invention, the maximum displacement amount of the buffer mechanism can be restricted with a simple configuration, and the impact force input to the linear motion guide can be reduced even when the stopper functions. Therefore, the stability of the in-wheel motor system can be easily ensured.

It is a figure which shows the structure of the buffer mechanism provided with the stopper mechanism which concerns on the best form of this invention. It is a figure which shows the attachment method of the guide receiving member which concerns on this best form. It is a figure which shows the other example of a stopper mechanism. It is a figure which shows the structure of the conventional in-wheel motor system. It is a figure which shows the structure of the linear motion guide with a spring used for the conventional buffer mechanism. It is a figure which shows the structure of the buffer mechanism provided with the linear motion guide with a spring.

Explanation of symbols

1 tire, 2 wheel, 3 in-wheel motor, 3a non-rotating side case,
3b Rotating side case, 5 knuckle, 10 shock absorber, 11 knuckle side plate,
11m, 11n fixing member, 12 linear motion guide with spring, 12A linear motion guide,
12B Spring member, 12a Linear bearing, 12b Rod,
13 Second linear motion guide, 14A, 14B Guide receiving member, 15 Damper,
15a cylinder, 15b shaft, 16 damper receiving member,
17A, 17B protrusion, 18A, 18B rubber bush, 20 rib member,
20k Notch.

Claims (3)

And the in-wheel motor having an annular ring shape which is disposed at a top Symbol predetermined distance radially inwardly of the motor rotor and the motor rotor of the motor stator, a non-rotating side case of the annular housing the motor stator an in-wheel motor system comprising a buffering mechanism for supporting the upper Symbol non-rotating side case the knuckle is vehicle underbody parts have a linear guide and spring member and the spring-loaded linear guide which is formed integrally ,
The buffering mechanism in a vehicle upper side and lower side of the knuckle side plate for fixing to the knuckle, and each provided at a position away from the spring with linear guides, projecting toward the non-rotating side case A protrusion to be
An in-wheel motor system comprising: a stopper rubber that is attached to the inner peripheral side of the non-rotating side case at a position facing the protrusion.   The in-wheel motor system according to claim 1, wherein a distance in the vehicle front-rear direction between the position of the protrusion and the position of the center of gravity of the motor is set to be equal to or less than half of the inner radius of the non-rotating side case.   A hollow disk-shaped rib member protruding radially inward from the inner peripheral side of the non-rotating side case is provided, and the upper and lower receiving portions of the spring-loaded linear guide are fixed to the rib member, and the upper and lower The in-wheel motor system according to claim 1, wherein the stopper rubber is attached to each of the receiving portions.

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