CN214465750U

CN214465750U - Vibration-proof device

Info

Publication number: CN214465750U
Application number: CN202023110525.0U
Authority: CN
Inventors: 伊藤优歩; 井上敏郎
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-10-22
Anticipated expiration: 2030-12-22

Abstract

The utility model provides a vibration isolator can make the adjustment of the elasticity of the each direction of the power of applying for from a plurality of directions of mount pad on the sub vehicle frame of the driving source of vehicle become for changeing, and can promote the magnetic flux density of the inside of magnetic current becomes the elastomer to can obtain the rigidity change of bigger mount pad. The vibration isolation device includes: an inner tube which is made of a magnetic body and has a hollow shaft portion for fastening to the vehicle; an outer cylinder that is made of a magnetic material and is disposed coaxially with the inner cylinder on the radially outer side of the inner cylinder; a magnetorheological elastomer disposed between the inner cylinder and the outer cylinder; and a coil for applying a magnetic field for changing the viscoelasticity of the magnetorheological elastomer, wherein the magnetorheological elastomer is provided with a magnetic body therein, the magnetic body being provided separately from the inner cylinder and the outer cylinder.

Description

Vibration-proof device

Technical Field

The utility model relates to a vibration-proof device, and for being used for installing the vibration-proof device at a sub vehicle frame mounting bracket.

Background

Conventionally, a vibration isolating and noise reducing device for a vehicle is provided to suppress transmission of vibration generated by a driving force distribution device supported by a subframe and input (vibration force) from a road surface to a vehicle body side. For example, patent document 1 discloses a mount using a magnetorheological Elastomer (MRE) disposed on a subframe on which a drive source of a vehicle is mounted (paragraphs [0024], [0025], fig. 2 of patent document 1). Patent document 1 discloses a technique for improving the cornering performance of a vehicle by increasing the elastic modulus of a magnetorheological elastomer to increase the rigidity (yaw stiffness) of a mount at cornering with a large torque difference between right and left wheels (paragraph [0009] of patent document 1). Further, patent document 2 describes a direction of a change in rigidity caused by a magnetic field (magnetic field) of a magnetorheological elastomer (paragraphs [0028] - [0031] of patent document 2).

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open publication No. 6047087

[ patent document 2] International publication No. 2016/148011

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

However, conventionally, a mount seat and a magnetorheological elastic body are provided in a subframe in a portion where a vehicle body (main frame) of a vehicle supports the subframe of the vehicle, so that elastic forces (resistances) in respective directions against forces applied from a plurality of directions to the mount seat can be adjusted. Accordingly, although it has been proposed in the related art to use a magnetorheological elastomer so as to be able to vary the spring force of the mount in each application direction, there has been no discussion in the related art on how to increase the magnetic flux density (magnetic flux density) inside the magnetorheological elastomer.

The present invention has been made in view of the above-described circumstances, and provides a vibration isolator which can be mounted on a vehicle, can adjust the elastic force of a mount pad on a sub-frame of a drive source of the vehicle in each direction with respect to the force applied from a plurality of directions to be variable, can increase the magnetic flux density inside a magnetorheological elastomer, and can obtain a greater change in the rigidity of the mount pad.

[ means for solving problems ]

In order to achieve the object, the present invention provides a vibration isolator mountable on a vehicle, the vibration isolator comprising: an inner tube made of a magnetic material and having a hollow shaft portion for fastening to the vehicle body; an outer cylinder that is made of a magnetic material and is disposed coaxially with the inner cylinder on the radially outer side of the inner cylinder; a magnetorheological elastomer disposed between the inner cylinder and the outer cylinder; and a coil for applying a magnetic field for changing the viscoelasticity of the magnetorheological elastomer, wherein the magnetorheological elastomer is provided with a magnetic body therein, the magnetic body being provided separately from the inner cylinder and the outer cylinder.

In this way, by disposing the magnetorheological elastomer between the inner cylinder and the outer cylinder, the elastic force of the mount base on the subframe of the drive source of the vehicle in each direction against the force applied from a plurality of directions can be adjusted to be variable, and by disposing the magnetic body inside the magnetorheological elastomer and disposing the magnetic body separately from the inner cylinder and the outer cylinder (that is, as a separate member from the inner cylinder and the outer cylinder), the magnetic flux density inside the magnetorheological elastomer can be increased and a greater change in the rigidity of the mount base can be obtained.

In one embodiment of the present invention, the magnetic member provided separately from the inner tube and the outer tube is a flat plate-like magnetic member.

In this way, the magnetic body provided separately from the inner cylinder and the outer cylinder is provided as a flat magnetic body, which can increase the magnetic flux density inside the magnetorheological elastomer and obtain a greater change in the rigidity of the mount, and further, the structure is simple and the arrangement process is simple.

In one embodiment of the present invention, the flat magnetic body is arranged to be orthogonal to the arrangement of the magnetic particles of the magnetorheological elastomer.

In this way, by arranging the flat magnetic body so as to be orthogonal to the arrangement of the magnetic particles of the magnetorheological elastic body, the magnetic flux density inside the magnetorheological elastic body can be efficiently increased, and a greater change in the rigidity of the mount can be obtained.

In one embodiment of the present invention, the arrangement of the magnetic particles of the magnetorheological elastomer is parallel to the axial direction of the inner cylinder.

In this way, by arranging the magnetic particles of the magnetorheological elastomer so as to be aligned parallel to the axial direction of the inner cylinder, the rigidity in the axial direction can be controlled.

In one embodiment of the present invention, a plurality of the magnetic bodies are provided separately from the inner tube and the outer tube.

By providing a plurality of flat magnetic bodies in this manner, the variation in rigidity can be controlled regardless of the thickness of the magnetorheological elastomer.

In an embodiment of the present invention, the vibration isolator is used for a bushing of a suspension arm of a vehicle.

In this way, by disposing the vibration isolator in the bushing of the suspension arm of the vehicle, the rigidity of the bushing of the suspension arm can be varied, so that the vehicle can achieve both of the ride quality performance and the vibration noise performance, wherein the rigidity can be increased when the ride quality performance is required and the rigidity can be decreased when the vibration noise performance is required, thereby providing the vibration isolator capable of achieving both of the ride quality performance and the vibration noise performance.

[ effects of the utility model ]

In view of the above, the vibration isolator according to the present invention can adjust the elastic force in each direction against the force applied from a plurality of directions of the mount base on the sub-frame of the drive source of the vehicle to be variable by disposing the magnetorheological elastomer between the inner tube and the outer tube, and can increase the magnetic flux density inside the magnetorheological elastomer and obtain a greater change in the rigidity of the mount base by disposing the magnetic body inside the magnetorheological elastomer and disposing the magnetic body separately from the inner tube and the outer tube (i.e., as a separate member from the inner tube and the outer tube). In addition, when the vibration isolator of the present invention is disposed in the bushing of the suspension arm of the vehicle, the rigidity of the bushing of the suspension arm can be changed, so that the rigidity can be increased when the ride quality performance is required, and the rigidity can be decreased when the vibration noise performance is required, thereby providing the vibration isolator capable of achieving both the ride quality performance and the vibration noise performance.

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a partially omitted cross-sectional view schematically showing a state in which a mount provided with a vibration isolator according to an embodiment of the present invention is fastened to a sub-frame so as to be attached to a vehicle body (main frame).

Fig. 2 is a vertical sectional view schematically showing components of the vibration isolator of fig. 1.

Fig. 3A is a schematic diagram showing a state of a magnetorheological elastomer structure having a basic structure in a case where an external force in a shearing direction is not applied.

Fig. 3B is a schematic view showing a state of a magnetorheological elastomer structure having a basic structure which is laterally deflected by an external force in a shear direction.

FIG. 3C is a schematic view showing a state in which a resistance force is increased in a magnetorheological elastomer structure of a basic structure when a magnetic field in a vertical direction is applied.

Fig. 4 is a partially enlarged view schematically showing a magnetorheological elastomer of the vibration isolator of fig. 2.

Description of reference numerals:

10: vibration device

12: main frame

16: auxiliary frame

18: mounting seat

36: bolt

38: nut

30: outer cylinder

40: inner cylinder

50: coil

60: magnetorheological elastomer

60A: magnetic body

100: magnetorheological elastomer structure

101: upper supporting body

102: lower support

104: iron powder

106: iron powder

108: elastic body

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments described below, when reference is made to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like, unless otherwise specified. In the following embodiments, each constituent element is not necessarily essential to the present invention, except for the specific description. In the following description, when there are a plurality of embodiments, the characteristic portions of the respective embodiments can be appropriately combined and previously determined from the beginning, unless otherwise specified.

Hereinafter, a vibration isolator according to the present invention for mounting to a mounting bracket for a sub-frame will be described in detail with reference to the accompanying drawings by referring to preferred embodiments.

Fig. 1 is a partially omitted cross-sectional view schematically showing a state in which a mount provided with a vibration isolator according to an embodiment of the present invention is fastened to a sub-frame so as to be attached to a vehicle body (main frame). Fig. 2 is a vertical sectional view schematically showing components of the vibration isolator of fig. 1. Referring to fig. 1 and 2, the vibration isolator 10 of the present invention may be mounted on a mounting seat 18 of a vehicle, and a subframe 16 of the vehicle may be coupled to a main frame (vehicle body) 12 via the mounting seat 18. The steered wheels of the vehicle are coupled to a steering wheel (not shown) via a rack mechanism and a steering shaft, and are suspended from the main frame 12 and the sub-frame 16 by a suspension device (not shown).

As shown in fig. 1 and 2, the vibration isolator 10 is composed of a cylindrical outer cylinder 30, a cylindrical inner cylinder 40, a magnetorheological elastic body 60, and a coil 50. The outer cylinder 30 is made of a magnetic material embedded in the subframe 16, and the inner cylinder 40 is made of a magnetic material, and is inserted by a bolt (through bolt) 36 and fastened to the main frame 12 by the bolt 36 and a nut 38. The magnetorheological elastomer 60 is disposed between the inner cylinder 40 and the outer cylinder 30. The outer cylinder 30 is arranged coaxially with the inner cylinder 40 on the radially outer side.

A cylindrical coil (excitation coil) 50 is housed in a side wall of the cylindrical inner tube 40, and the coil 50 generates a magnetic field (magnetic flux) having an intensity corresponding to the magnitude of a coil excitation current supplied from a vehicle Control Unit (ECU) (not shown). The flange-like magnetorheological elastomer 60 is held in the flange-like space formed by both ends of the outer cylinder 30 in the axial direction, that is, the magnetorheological elastomer 60 is held in a state of being bound in the flange-like space formed by both ends of the outer cylinder 30 in the axial direction. The magnetorheological elastomer 60 is a member whose viscoelastic properties vary according to the magnitude of the magnetic field generated by the excitation coil 50. Specifically, the magnetorheological elastomer 60 is made of an elastic material such as a rubber material to which magnetic powder such as iron powder is added, and has a property that the rigidity is low in a state where the magnetic field generated by the coil 50 is absent (or low), and the rigidity is increased depending on the magnitude of the magnetic field in a state where the magnetic field generated by the coil 50 is present.

First, before describing the structure and the operation and effects of the vibration damping device 10 according to the present embodiment, the operation and effects of the magnetorheological elastomer structure (structure of a magnetorheological elastomer) 100 having a basic structure will be described with reference to fig. 3A, 3B, and 3C for the sake of easy understanding. Fig. 3A is a schematic diagram showing a state of a magnetorheological elastomer structure having a basic structure in a case where an external force in a shearing direction is not applied. Fig. 3B is a schematic view showing a state of a magnetorheological elastomer structure having a basic structure which is laterally deflected by an external force in a shear direction. FIG. 3C is a schematic view showing a state in which a resistance force is increased in a magnetorheological elastomer structure of a basic structure when a magnetic field in a vertical direction is applied.

Fig. 3A shows a state of the magnetorheological elastomer structure 100 in a case where an external force in a shear direction (shear stress) is not applied. In the magnetorheological elastomer structure 100 in fig. 3A, the magnetorheological elastomer 108 in which the elastomer 106 is cured is disposed between the upper support 101 and the lower support 102, and the elastomer 106 is, for example, silicone rubber of iron powder 104 or the like as magnetic particles oriented in the vertical direction.

As shown in fig. 3B, for example, when an external force in the shearing direction is applied to the upper support 101 in a state where the lower support 102 is fixed to a base (not shown), the magnetorheological elastic member 108 is flexed in the lateral direction to which the external force in the shearing direction is applied. In this case, the elastic body 106 generates resistance to the external force in the shear direction to return to its original shape.

As shown in fig. 3C, when a magnetic flux (magnetic field) indicated by a broken-line arrow in the vertical direction is applied, the resistance of the iron powder 104 in the direction indicated by a short arrow to return to the direction corresponding to the magnetic flux direction increases. The resistance shown by the short arrow from right to left increases on the upper side of the magnetorheological elastomer structure 100 and the resistance shown by the arrow from left to right increases on the lower side of the magnetorheological elastomer structure 100. The larger the magnitude of the magnetic field, the larger the value of the resistance. Thus, in the magnetorheological elastomer structure 100, the resistance to the external force in the shear direction can be changed (varied) according to the magnitude of the applied magnetic field.

Accordingly, for example, in the mount 18 to which the vibration isolator 10 of the present invention is mounted, the larger the yaw rate obtained by the yaw rate sensor and the larger the vehicle speed obtained by the vehicle speed sensor are controlled by the control device of the vehicle (not shown), the larger the coil exciting current of the coil 50 is, and thereby the resistance of the mount 18 can be increased, that is, the elasticity of the mount 18 can be fixed (variable). Therefore, for example, when traveling on a straight road or cruising on an expressway, the control device of the vehicle can set the coil exciting current to a zero value or a small value to soften the elasticity of the mount 18 and cut off the forced vibration input from the internal combustion engine or the electric motor, and in addition, can block the vibration input transmitted from the road surface to the main frame 12 via the suspension, and as a result, can suppress the sound and vibration felt by the passenger in the vehicle cabin, and can improve the comfort. On the other hand, in a so-called curved road or a winding road, the control device of the vehicle increases the coil exciting current to fix (vary) the mount 18, thereby improving the vehicle drivability (turning performance) and the steering stability of the driver.

Fig. 4 is a partially enlarged view schematically showing a magnetorheological elastomer of the vibration isolator of fig. 2. Referring to fig. 2 and 4, the vibration isolator 10 has an inner cylinder 40, an outer cylinder 30, a magnetorheological elastomer 60, and a coil 50 as an excitation coil. The inner tube 40 is made of a magnetic material and has a hollow shaft portion for fastening to the main frame 12. The outer cylinder 30 is made of a magnetic material, and is disposed coaxially with the inner cylinder 40 on the radially outer side of the inner cylinder 40. The magnetorheological elastomer 60 is disposed between the inner cylinder 40 and the outer cylinder 30. The coil 50 applies a magnetic field that changes the viscoelasticity of the magnetorheological elastomer 60. The magnetorheological elastomer 60 is composed of a plurality of magnetorheological elastomers having different arrangements of magnetic particles such as iron powder 104.

As shown in fig. 4, in the present embodiment, the magnetic body 60A is provided inside the magnetorheological elastic body 60, and the magnetic body 60A is provided separately from the inner cylinder 40 and the outer cylinder 30. In other words, although both the inner cylinder 40 and the outer cylinder 30 are made of magnetic materials, the magnetic material 60A additionally provided inside the magnetorheological elastic body 60 is a different member from the inner cylinder 40 and the outer cylinder 30.

By disposing the magnetorheological elastomer 60 between the inner cylinder 40 and the outer cylinder 30, the elastic force of the mount 18 on the subframe 16 of the drive source of the vehicle in each direction against the force applied from a plurality of directions can be adjusted to be variable, and by disposing the magnetic body 60A inside the magnetorheological elastomer 60 and disposing the magnetic body 60A separately provided from the inner cylinder 40 and the outer cylinder 30 (that is, as a separate member from the inner cylinder 40 and the outer cylinder 30), the magnetic flux density inside the magnetorheological elastomer 60 can be increased and a greater change in the rigidity of the mount 18 can be obtained.

In the present embodiment, as shown in fig. 4, the magnetic body 60A provided separately from the inner tube 40 and the outer tube 30 is provided as a flat plate-like magnetic body. In this way, by providing the magnetic body 60A in the magnetorheological elastic body 60 as a flat magnetic body, the magnetic flux density in the magnetorheological elastic body 60 can be increased, and a greater change in the rigidity of the mount can be achieved.

In the present embodiment, as shown in fig. 4, the magnetic body 60A is provided inside the magnetorheological elastomer 60, and has a function of reducing the thickness of the magnetorheological elastomer 60 as if the magnetorheological elastomer 60 is divided. Since the magnetic flux density becomes lower as the thickness of the magnetorheological elastomer 60 becomes thicker and the magnetic flux becomes harder to penetrate, the amplitude of the change in rigidity becomes smaller. Therefore, since the flat magnetic body 60A is provided inside the magnetorheological elastomer 60, the thickness of the magnetorheological elastomer 60 can be reduced by a simple manufacturing process because the structure is simple and uncomplicated, and the magnetic flux density is increased because the magnetic flux is easily penetrated, thereby increasing the range of rigidity change.

In the present embodiment, the flat plate-like magnetic body 60A may be provided so as to be orthogonal to the arrangement of the magnetic particles of the magnetorheological elastic body 60. By disposing the flat magnetic body 60A so as to be orthogonal to the arrangement of the magnetic particles of the magnetorheological elastic body 60 in this manner, the magnetic flux density inside the magnetorheological elastic body 60 can be efficiently increased, and a greater change in the rigidity of the mount 18 can be obtained.

In the present embodiment, the arrangement of the magnetic particles of the magnetorheological elastomer 60 is such that the magnetic particles are arranged in parallel to the axial direction of the inner cylinder 40. By arranging the magnetic particles of the magnetorheological elastomer 60 so as to be aligned parallel to the axial direction of the inner cylinder 40 in this manner, the rigidity in the axial direction can be controlled.

In the present embodiment, a plurality of magnetic bodies 60A provided separately from the inner tube 40 and the outer tube 30 are provided. For example, a plurality of flat plate-like magnetic bodies 60A are provided inside the magnetorheological elastic body 60. By providing a plurality of the flat plate-like magnetic bodies 60A in this manner, the variation in rigidity can be controlled regardless of the thickness of the magnetorheological elastic body 60.

In the present embodiment, the vibration isolator 10 is used for a bushing of a suspension arm (for example, the subframe 16) of a vehicle. The utility model discloses a vibration isolator 10 is the structure that can be used as suspension arm axle bush and subframe installation axle bush, be an installation axle bush that uses magnetic current change elastomer 60, can control the rigidity of installation axle bush through the electric current that applies to magnetic current change elastomer 60, can make the rigidity of suspension arm axle bush and subframe installation axle bush variable, in order to increase the rigidity when the quality performance (ride quality performance) is taken to needs, and reduce the rigidity when the vibration noise performance (vibration noise performance) is required, thereby can realize taking quality performance and vibration noise performance simultaneously.

As described above, by disposing the vibration isolator 10 in the bushing of the suspension arm (for example, the subframe 16) of the vehicle, it is possible to make the rigidity of the bushing of the suspension arm variable, so that it is possible to achieve both the ride quality performance and the vibration noise performance of the vehicle, in which the rigidity can be increased when the ride quality performance is required and the rigidity can be decreased when the vibration noise performance is required, and thus it is possible to provide a vibration isolator which can achieve both the ride quality performance and the vibration noise performance.

In addition, the magnetic body 60A is provided inside the magnetorheological elastomer 60 of the vibration isolator 10 according to the present invention, and the thickness of the magnetorheological elastomer 60 in the axial direction of the inner tube 40 is reduced to increase the magnetic flux density, thereby achieving an effect of increasing the range of the rigidity change. With the vibration isolator 10 of the present invention disposed in the bushing of the suspension arm of the vehicle, the range of rigidity change of the bushing of the suspension arm can be increased, and therefore, the function of enabling the vehicle to take into account the ride quality performance and the vibration noise performance can be further enhanced.

In view of the above, the vibration isolator according to the present invention can adjust the elastic force in each direction against the force applied from a plurality of directions of the mount base on the sub-frame of the drive source of the vehicle to be variable by disposing the magnetorheological elastomer between the inner tube and the outer tube, and can increase the magnetic flux density inside the magnetorheological elastomer and obtain a greater change in the rigidity of the mount base by disposing the magnetic body inside the magnetorheological elastomer and disposing the magnetic body separately from the inner tube and the outer tube (i.e., as a separate member from the inner tube and the outer tube). In addition, through will the utility model discloses a when the antivibration device disposes the bush of the suspension arm of vehicle, because the utility model discloses an antivibration device's magnetorheological elastomer's inside has set up the magnetic substance, can make magnetic flux density increase and obtain the effect that the range of rigidity change increases to can further promote the function that makes the vehicle can compromise and take quality performance and vibration noise performance.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An antivibration device mountable to a vehicle, comprising:

an inner tube which is made of a magnetic body and has a hollow shaft portion for fastening to the vehicle;

an outer cylinder that is made of a magnetic material and is disposed coaxially with the inner cylinder on the radially outer side of the inner cylinder;

a magnetorheological elastomer disposed between the inner cylinder and the outer cylinder; and

a coil for applying a magnetic field for changing the viscoelasticity of the magnetorheological elastomer,

wherein the magnetorheological elastomer is internally provided with a magnetic body which is arranged separately from the inner cylinder and the outer cylinder.

2. The vibration isolator according to claim 1, wherein the magnetic body provided separately from the inner tube and the outer tube is a flat-plate-shaped magnetic body.

3. The vibration isolator according to claim 2, wherein the flat-plate-like magnetic body is provided so as to be orthogonal to the arrangement of the magnetic particles of the magnetorheological elastomer.

4. A vibration isolator as claimed in any one of claims 1 to 3, wherein the magnetic particles of the magnetorheological elastomer are arranged so as to be aligned parallel to the axial direction of the inner cylinder.

5. The vibration isolator according to any one of claims 1 to 3, wherein a plurality of the magnetic bodies provided separately from the inner tube and the outer tube are provided.

6. Vibration isolator according to any of claims 1 to 3, characterized in that it is used for bushings of suspension arms of vehicles.