JP2008185165A - Vibration absorbing machine for in-wheel motor, and compound damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration absorbing machine for in-wheel motor equipped with a damper which does not spoil the effect of a dynamic damper even during fine input, and a damper used for this. <P>SOLUTION: The damper used for a vibration absorbing machine 20 for in-wheel motor comprises a plate member 31, a permanent magnet 32 which is arranged in both sides of this plate member 31, and generates a static magnetic field in a direction perpendicular to the thickness direction of the plate member 31, a magnetic substance containing visco-elasticity material 33 attached in this permanent magnet 32 and the plate member 31, a yoke member 34 attached in a rear side of the permanent magnet 32, and upper and lower attaching members 35, 36. Furthermore, a compound damper device 30 is used, which is equipped with the function of giving another damping effect caused by magnetic particles to the visco-elasticity damper, has no friction at the time of movement, and furthermore, is high in damping effect. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration absorber for an in-wheel motor for floating-mounting a motor for driving a wheel with respect to an undercarriage part of a vehicle.

In general, in a vehicle having a suspension mechanism such as a spring around the undercarriage, the larger the mass of parts corresponding to the unsprung parts such as wheels, knuckles, and suspension arms, the larger the so-called unsprung mass, The ground contact force fluctuates and the load holding performance deteriorates. Conventionally, however, the drive motor is connected to a component called an upright or knuckle, which is one of the components that make up the undercarriage of the vehicle. As a result, there is a problem that the load holding property deteriorates.
Therefore, the in-wheel motor is elastically supported with respect to a suspension part such as a knuckle disposed under the vehicle spring via a buffer mechanism or a buffer member, so that the motor is supported by the suspension part of the vehicle (the bottom part of the vehicle spring). In-wheel motor systems having a floating mount configuration have been proposed. As a result, the mass of the in-wheel motor can be separated from the lower part of the vehicle spring and act as the mass of the dynamic damper, so that both the ground contact performance and the riding comfort performance when traveling on rough roads can be greatly improved. (For example, see Patent Documents 1 to 3).

The in-wheel motor used in the above-mentioned Patent Documents 1 to 3 is arranged in a concentric manner with a rotation-side case with a motor rotor attached, the radially inner side being opened, and a predetermined distance from the motor rotor. This is a hollow outer rotor type electric motor that is rotatably connected via a bearing to a non-rotating side case that is open on the outer side in the radial direction, with a motor stator attached thereto. 4 also proposes an in-wheel motor system in which the inner rotor type electric motor 10 as shown in FIG. 4 is floating mounted on the knuckle 5 which is a vehicle unsprung part using the in-wheel motor vibration absorber 20A. (Japanese Patent Application No. 2006-26385).
FIGS. 5A and 5B are diagrams showing the configuration of an in-wheel motor vibration absorber 20A which is a buffer mechanism for floating mounting the inner rotor type electric motor (in-wheel motor) 10 below the vehicle spring. FIG. 6 is a view showing a configuration of a spring-equipped linear motion guide 23 used in the vibration absorber 20 for an in-wheel motor.
This in-wheel motor vibration absorber 20A includes a knuckle-side attachment member 22 attached to a knuckle 5 that supports a non-rotating-side member of a wheel, a linear motion guide 23 with a spring, and a linear motion guide 23A and a spring member 23B. And upper and lower guide receiving members 24, 25 respectively connected to the upper end side and the lower end side of the guide shaft 23b of the linear motion guide 23A, the upper guide receiving member 24 and the upper surface side of the motor case 10a. And a damper 27 having a cylinder 27a, a piston (not shown), and a cylinder lot 27b connected to the piston, which are arranged in parallel to the guide shaft 23b. The mounting member 22 includes a guide fixing member 22a for fixing the guide bearing 23a of the linear guide 23A, Configured id fixing member 22a integrally, and is configured to guide fixing member 22a for supporting the spring-loaded linear motion guide 23 and a knuckle mounting member 22b has for attachment to the knuckle 5. In FIGS. 5 and 6, reference numerals 28 and 29 denote between the guide fixing member 22a and the lower guide receiving member 25 in order to prevent dust and muddy water from entering the linear motion guide 23A. These are bellows-shaped boots attached between the guide fixing member 22a and the upper guide receiving member 24.

When the in-wheel motor 10 is elastically supported at the lower part of the vehicle spring by using the vibration absorber 20A for the in-wheel motor, the motor-side mounting member 21, the knuckle-side mounting member 22, the linear guide 23 with the spring, the upper and lower guide receivers After the members 24 and 25, the swing preventing member 26, the damper 27, and the bellows-like boots 28 and 29 are integrally assembled into a unit, the knuckle mounting member 22b is placed on the knuckle 5 on the motor side mounting member 21. Are attached to the side surface of the motor case 10a, and the anti-swing member 26 is attached to the upper side surface of the motor case 10a. As a result, as shown in FIG. 4, the in-wheel motor 10 can be easily floating mounted on the knuckle 5 which is a vehicle unsprung part.
In FIG. 4, reference numeral 1 denotes a tire, and the output shaft of the in-wheel motor 10 and the wheel 2 are connected by a flexible coupling (not shown).
WO 02/083446 A1 JP 2005-126037 A JP 2005-225486 A

  Incidentally, in the conventional in-wheel motor vibration absorber 20A, an oil damper is used as the damper 27. The oil damper is small and compact, and not only has a large amount of energy absorption, but also has the advantage that the damping characteristics can be changed in various ways, such as proportional to speed and proportional to the square of speed, but liquid (oil) is used for energy absorption. Because it is used, a seal is essential. Therefore, the friction caused by the seal cannot be completely eliminated, and therefore the effect of the dynamic damper may be reduced at the time of minute input.

  The present invention has been made in view of the conventional problems, and provides a vibration absorber for an in-wheel motor provided with a damper that does not impair the effect of a dynamic damper even at a minute input, and a damper used in the damper. For the purpose.

The invention according to claim 1 of the present application includes an elastic member, a damper, and a linear guide for guiding the operating direction of the elastic member and the damper for floating mounting a motor for driving the wheel below the vehicle spring. A damper that includes the shaft member that reciprocates in the guide direction of the linear guide as the damper, a magnet that is disposed around the shaft member at a predetermined distance from the plate member, and the magnet And a composite damper provided with a magnetic body-containing viscoelastic body formed by blending magnetic particles with a viscoelastic body, which is attached between the shaft member and the shaft member.
The invention according to claim 2 is a composite damper comprising a viscoelastic body containing a magnetic body and a magnetic body-containing viscoelastic body, the shaft member, and the plate member around the shaft member. The above-mentioned magnetic material-containing viscoelastic body is attached between magnets arranged at a predetermined distance apart.
The invention according to claim 3 is the composite damper according to claim 2, wherein the viscoelastic body is a rubber-based viscoelastic body and the magnetic body-containing viscoelastic body is added to the magnet and the shaft member. Sulfur-bonded.

According to the present invention, a shaft member that reciprocates in the guide direction of a linear guide as a damper used in a vibration absorber for an in-wheel motor for floatingly mounting a motor for driving a wheel under a vehicle spring, and the shaft member A magnet disposed at a predetermined distance around the plate member, and a magnetic material-containing viscoelastic body formed by mixing magnetic particles with a viscoelastic body attached between the magnet and the shaft member With the use of a composite damper that has no friction and increases the damping force due to shear deformation of the viscoelastic body, the dynamic damper effect of the in-wheel motor can be further stabilized even with a small amount of input. Can be demonstrated.
Further, if the viscoelastic body is a rubber-based viscoelastic body and the magnetic body-containing viscoelastic body is vulcanized and bonded to the magnet and the shaft member, a composite damper having excellent durability can be easily obtained. Can be produced.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
In the following description, the same reference numerals are used for portions common to the conventional example, and detailed description thereof is omitted.
FIG. 1 is a diagram showing a configuration of an in-wheel motor vibration absorber (hereinafter referred to as a vibration absorber) 20 used as a shock absorber for an in-wheel motor system according to the best mode. In FIG. , 22 is a knuckle-side mounting member formed integrally with a guide fixing member 22a and a knuckle mounting member 22b, 23 is a linear motion guide with a spring provided with a linear motion guide 23A and a spring member 23B, and 24 and 25 are upper and lower guides. A receiving member, 26 is a rocking prevention member, and 30 is a composite damper device according to the present invention.
As shown in FIG. 2, the composite damper device 30 is arranged with a plate member 31 extending in the guide direction of the linear guide 23 </ b> A, and on the both sides of the plate member 31 with a predetermined distance from the plate member 31. A permanent magnet 32 that generates a static magnetic field in a direction orthogonal to the thickness direction of the plate member 31, a magnetic body-containing viscoelastic body 33 attached to the permanent magnet 32 and the plate member 31, and the permanent magnet 32. A yoke member 34 made of a soft magnetic material such as iron or silicon steel plate attached to the surface opposite to the magnetic material-containing viscoelastic body 33, and an upper end portion of the plate member 31 are provided on the guide fixing member 22a. An upper mounting member 35 for mounting on the damper mounting portion 22d and a lower mounting for mounting the yoke member 34, which is also a holding means for the permanent magnet 32, on the central leg portion 21d of the motor side mounting member 21 And a wood 36.
The magnetic body-containing viscoelastic body 33 is a mixture of magnetic particles such as Ni and Co in a viscoelastic body such as rubber or polymer. In this example, a rubber-based elastic body is used as the viscoelastic body. As magnetic particles, fine particles of metallic Ni are used.
In this example, the magnetic body-containing viscoelastic body 33 is attached to the permanent magnet 32 and the plate member 31 by vulcanization and adhesion. Therefore, the material of the plate member 31 is from the viewpoint of adhesiveness. It is preferable to use a thermoplastic resin material, or a rubber material with high hardness such as natural rubber or high damping rubber. Moreover, as a material of the permanent magnet 32, it is preferable to use a sintered magnet having a high transition temperature such as a neodymium magnet.
The yoke member 34 is not an essential component, but forms a magnetic circuit together with the permanent magnet 32, reduces the leakage magnetic field of the permanent magnet 32, and is contained in the magnetic body-containing viscoelastic body 33. It functions to efficiently apply a magnetic field to the magnetic particles.

The composite damper device 30 has both the properties of a viscoelastic damper and a magnetic fluid damper. The magnetic particle moving in the magnetic field created by the permanent magnet 32 and the shear deformation of the viscoelastic body of the magnetic body-containing viscoelastic body 33. Since the vertical movement of the plate member 31 connected by the permanent magnet 32 corresponding to the damper casing and the magnetic material-containing viscoelastic body 33 is attenuated by the braking force acting on the damper housing, the damping is more attenuated than in the case of the viscoelastic single body. The effect can be enhanced.
FIG. 3 is a diagram in which an in-wheel motor 10 is floating mounted on a knuckle 5 which is a vehicle spring lower member using an in-wheel motor vibration absorber 20 equipped with a magnetic damper device 30 according to the present invention. At this time, when the in-wheel motor 10 swings in the vertical direction with respect to the knuckle 5, the plate member 31 of the composite damper device 30 moves in the vertical direction accordingly. At this time, the plate member 31 The energy is absorbed by the shear deformation of the viscoelastic body 33 of the magnetic body-containing viscoelastic body 33 and the motion is attenuated, and the magnetic particles in the magnetic body-containing viscoelastic body 33 are returned to the permanent magnet 32 side. Such a braking force acts and this attenuates the motion of the magnetic substance-containing viscoelastic body 33, so that the damping effect can be surely exhibited.
Further, unlike the oil damper, the composite damper device 30 has no friction during movement, and therefore, even at a minute input, the effect of the dynamic damper is not impaired, so that the dynamic damper effect of the in-wheel motor can be stabilized. It can be demonstrated.

  Thus, according to this best mode, the damper of the in-wheel motor vibration absorber 20 is disposed on both sides of the plate member 31 and the plate member 31 in a direction orthogonal to the thickness direction of the plate member 31. A permanent magnet 32 for generating a static magnetic field, a magnetic material-containing viscoelastic body 33 attached to the permanent magnet 32 and the plate member 31, a yoke member 34 attached to the back side of the permanent magnet 32, and an upper portion Since the viscoelastic damper provided with the lower mounting members 35 and 36 is further provided with a damping effect by the magnetic particles, there is no friction during movement, and the composite damper device 30 having a high damping effect is used. Even at a minute input, the dynamic damper effect of the in-wheel motor can be stably exhibited.

In the best mode, the plate member 31 is attached to the knuckle 5 side, and the permanent magnet 32 side is attached to the in-wheel motor 10 side. However, the plate member 31 is attached to the in-wheel motor 10 side, You may make it attach the permanent magnet 32 side to the knuckle 5 side.
In the above example, the permanent magnet 32 is used as the magnetic field generating means, but an electromagnet may be used. As a result, it is possible to easily perform tuning for confirming the influence on the vehicle when the attenuation constant changes during a running test of an actual vehicle.

  As described above, according to the present invention, since the composite damper having the magnetic material-containing viscoelastic body is used as the damper of the vibration absorber for the in-wheel motor, the dynamic damper effect of the in-wheel motor can be achieved even at a minute input. Can be exhibited more stably.

It is a figure which shows the structure of the vibration absorber for in-wheel motors which concerns on the best form of this invention. It is a figure which shows the structure of the composite damper by this invention. It is a figure which shows the structure of the in-wheel motor system carrying the vibration absorber for in-wheel motors of this invention. It is a figure which shows the structure of the in-wheel motor system carrying the conventional vibration absorber for in-wheel motors. It is a figure which shows the structure of the conventional damper for in-wheel motors. It is a figure which shows the structure of the linear guide with a spring.

Explanation of symbols

20 vibration absorber for in-wheel motor, 21 motor side mounting member, 22 knuckle side mounting member, 22a guide fixing member, 22b knuckle mounting member,
23 linear motion guide with spring, 23A linear motion guide, 23B spring member,
24, 25 Guide receiving member, 26 Anti-swing member, 28, 29 Bellows-shaped boot,
30 composite damper device, 31 plate member, 32 permanent magnet, 33 magnetic substance-containing viscoelastic body,
34 York member, 35 Upper mounting member, 36 Lower mounting member.

Claims (3)

  A vibration absorber for floating mounting a motor for driving a wheel under a vehicle spring, a damper, and a linear motion guide for guiding an operating direction of the elastic member and the damper, as the damper A shaft member that reciprocates in the guide direction of the linear guide, a magnet that is arranged around the shaft member and spaced apart from the plate member by a predetermined distance, and is attached between the magnet and the shaft member. A vibration absorber for an in-wheel motor using a composite damper comprising a viscoelastic body and a magnetic body-containing viscoelastic body formed by mixing magnetic particles.   A magnetic material is blended in a shaft member, a magnet disposed around the shaft member at a predetermined distance from the plate member, and a viscoelastic body attached between the magnet and the shaft member. A composite damper comprising the magnetic material-containing viscoelastic body.   The composite damper according to claim 2, wherein the viscoelastic body is a rubber-based viscoelastic body, and the magnetic body-containing viscoelastic body is vulcanized and bonded to the magnet and the shaft member.

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