JP2005069433A - Magnetic spring mechanism and vibration insulating mechanism using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration insulating mechanism which can do with a smaller fitting space comparing with a conventional magnetic spring mechanism and simplify and miniaturize the construction of appliances such as a vehicle suspension mechanism. <P>SOLUTION: This mechanism is constructed to provide stationary magnets 30, 31 and a moving magnet 40 which is mounted relatively to the stationary magnets 30, 31 to enable to move in rotating direction and has a torque characteristics of angular displacement having an angular displacement range within which a rotational torque generated by the magnetic circuit consisted of the stationary magnets 30, 31 and the moving magnet 40 decreases when the angular displacement of the moving magnet 40 increases. Accordingly, the moving magnet 40 can be equipped so as to rotate together with the torque generating material in rotating direction like a torsion bar and this mechanism can be mounted near the fitting space like a torsion bar, so it can simplify and miniaturize the construction of the vibration insulating mechanism using a material which generates torque in a rotational direction and the magnetic spring mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a magnetic spring mechanism that can be incorporated into a vibration isolation system in a suspension mechanism or the like used for a vehicle seat such as an automobile, a train, and a ship, and a vibration isolation mechanism that uses the magnetic spring mechanism.

In recent years, there has been known a vibration isolation mechanism that uses a magnetic spring mechanism using a permanent magnet as a damping device and is combined with an elastic member such as a metal spring or rubber. The present applicant has also proposed various mechanisms. Yes. For example, in Patent Document 1 and Patent Document 2, a permanent magnet is disposed on each of the fixed side and the movable side, and the repulsive force and the attractive force are used, whereby a load is applied in a predetermined displacement range. A magnetic spring mechanism having a load characteristic that decreases and has a negative spring constant in the range is disclosed. This magnetic spring mechanism is combined with an elastic member such as a metal spring having a positive spring constant having substantially the same slope of the load-displacement characteristic, and a constant load in which the superimposed spring constant is substantially zero within a predetermined displacement range. It is possible to configure an anti-vibration mechanism provided to set the region and support the equilibrium point of the load mass within the range. Since it has a region where the spring constant is substantially zero, the acceleration transmissibility is suppressed, and vibration isolation is possible in a wide frequency band from low frequency to high frequency.
JP 2003-139192 A JP 2002-206594 A

  Although the vibration isolation mechanisms of Patent Document 1 and Patent Document 2 have excellent characteristics as described above, they are formed so that the movable side operates in a substantially linear direction with respect to the fixed side. Therefore, these vibration isolation mechanisms are attached so that the movable side operates in a linear direction with respect to the controlled object. For example, in a suspension mechanism that supports a vehicle seat as shown in FIG. 8, a magnetic spring mechanism (magnet unit) having a load characteristic in which the load decreases with an increase in the displacement amount within a predetermined displacement range. The fixed side is connected to the base part, and the movable side is connected to the support part attached to the vehicle seat. The magnetic spring mechanism (magnet unit) has a displacement range in which the load decreases. A torsion bar having an increasing positive load characteristic is combined to constitute a vibration isolation mechanism having a constant load region. Since such a magnetic spring mechanism (magnet unit) moves substantially in the linear direction on the movable side, it is completely independent from the torsion bar having a positive load characteristic in which elasticity functions in the rotational direction. And must be attached to the support. Therefore, in order to arrange such a magnetic spring mechanism (magnet unit), a predetermined mounting space having a size capable of ensuring the operation in the linear direction is required.

  The present invention has been made in view of the above, and when used together with a member that generates torque in the rotational direction, such as a torsion bar, the mounting space is small compared to a conventional magnetic spring mechanism, and a vehicle suspension mechanism, etc. An object of the present invention is to provide a magnetic spring mechanism capable of simplifying or downsizing the structure of the object to be applied and a vibration isolation mechanism using the magnetic spring mechanism.

In order to solve the above-described problems, the present inventor has focused on moving the movable side magnet in the rotational direction relative to the fixed side magnet, and has completed the present invention.
That is, the present invention according to claim 1 is configured to include a fixed-side magnet and a movable-side magnet provided to be displaceable in the rotational direction relative to the fixed-side magnet,
An angular displacement-torque characteristic having an angular displacement range in which a rotational torque generated by a magnetic circuit composed of a fixed side magnet and a movable side magnet decreases with an increase in the amount of change in the angular displacement of the movable side magnet. A magnetic spring mechanism is provided.
In this invention of Claim 2, the said stationary side magnet is arrange | positioned at the fixed frame at substantially arc shape,
2. The magnetic spring mechanism according to claim 1, wherein the movable side magnet is attached to a movable frame that can be rotated in parallel along the arc direction of the fixed side magnet arranged in a substantially arc shape. To do.
In this invention of Claim 3, two said fixed frames are arrange | positioned facing predetermined intervals, and the said fixed side magnet is provided in the substantially circular arc shape in each,
The magnetic spring mechanism according to claim 2, wherein the movable frame is rotatably provided between the two fixed frames.
In this invention of Claim 4, the magnetic spring mechanism of any one of Claims 1-3,
In the angular displacement range in which the rotational torque of the magnetic spring mechanism decreases, an angular displacement-torque characteristic in which the rotational torque increases as the amount of change in the angular displacement of the movable magnet increases, and the movable magnet in the rotational direction is provided. An elastic member for biasing,
By providing the magnetic spring mechanism and the elastic member in combination, there is provided a vibration isolation mechanism having a characteristic that a rotational torque obtained by combining both in the angular displacement range is substantially constant.
According to a fifth aspect of the present invention, there is provided the vibration isolation mechanism according to the fourth aspect, wherein the elastic member is constituted by a metal spring that urges the movable frame in the rotation direction.
According to a sixth aspect of the present invention, there is provided the vibration isolation mechanism according to the fifth aspect, wherein the metal spring comprises a torsion bar, and the movable frame is connected to the torsion bar.
According to the seventh aspect of the present invention, there is provided a vehicle suspension mechanism that includes a base portion and a support portion that supports an arbitrary load body, and elastically supports the support portion with respect to the base portion by the elastic member. The vibration isolation mechanism according to any one of claims 4 to 6, wherein the vibration isolation mechanism is attached.

  According to the present invention, the fixed-side magnet and the movable-side magnet provided so as to be displaceable in the rotational direction relative to the fixed-side magnet are configured, and the amount of change in the angular displacement of the movable-side magnet is With respect to the increase, an angular displacement-torque characteristic having an angular displacement range in which the rotational torque generated by the magnetic circuit composed of the fixed side magnet and the movable side magnet decreases is provided. Therefore, the movable magnet can be mounted so as to rotate together with a member that generates torque in the rotation direction, such as a torsion bar. That is, since the rotation base of the movable magnet can be supported by a member that generates torque in the rotation direction such as a torsion bar, it can be provided near the mounting space of the torsion bar or the like, and a conventional magnetic spring mechanism that operates linearly Thus, it is not necessary to secure an independent mounting space, and the structure of the vibration isolation mechanism using the member that generates torque in the rotation direction and the magnetic spring mechanism can be simplified and downsized.

  Hereinafter, embodiments of the present invention will be described in more detail based on the drawings. 1-5 is a figure which shows the magnetic spring mechanism 1 which concerns on one Embodiment of this invention. As shown in these drawings, the magnetic spring mechanism 1 of the present embodiment is configured to include fixed frames 10 and 11 and a movable frame 20.

  The fixed frames 10 and 11 are formed of two plate-like bodies that are arranged to face each other at a predetermined interval. In the figure, the fixed frames 10 and 11 are formed in a substantially triangular shape, and the vicinity of the top and the vicinity of both ends of the base are connected by the rivets 12 for maintaining the distance, respectively, so as to face each other with a predetermined distance.

  The movable frame 20 is disposed between the above-described fixed frames 10 and 11 and includes a shaft member 21 in the vicinity of the upper end. The shaft member 21 is inserted into and supported by the through holes 10a and 11a formed near the tops of the fixed frames 10 and 11.

  For example, in the case of the suspension mechanism as shown in FIG. 8, the fixed frames 10 and 11 are fixed to the base portion, and the shaft member 21 provided on the movable frame 20 is connected to the rotation side of the torsion bar. Established. Since the torsion bar itself needs to be fixedly supported at one end and rotatably supported at the other end, in any case, there is a member that pivotally supports the end of the rotation side. Although it is necessary, in this embodiment, by connecting to the shaft member 21 of the movable frame 20, the fixed frames 10 and 11 also serve as members that rotatably support the ends of the torsion bars. That is, since the magnetic spring mechanism 1 also functions as a member that supports the torsion bar, it is necessary to provide an independent magnetic spring mechanism in addition to the member that supports the torsion bar as in the prior art. Compared with the structure in which there has been, it is possible to simplify the structure of the vibration isolation mechanism comprising a combination of an elastic member such as a torsion bar and a magnetic spring mechanism, or to reduce the size of the vibration isolation mechanism.

  On the opposing surfaces of the fixed frames 10 and 11, fixed side magnets 30 and 31 made of permanent magnets are provided, and the movable frame 20 is provided with a movable side magnet 40 made of permanent magnets. Since the movable side magnet 40 moves in the rotation direction together with the movable frame 20, the fixed side magnets 30 and 31 are arranged so that the movable side magnet 40 continues to face the movable side magnet 40 as much as possible during the rotation operation. It is formed in a substantially arc shape substantially parallel to the motion trajectory. In other words, the movable side magnet 40 is attached to the movable frame 20 at a position where it can face as much as possible during the rotating operation with respect to the fixed side magnets 30 and 31 provided in a substantially arc shape. Specifically, an opening 22 facing each of the fixed side magnets 30 and 31 is opened near the lower end of the movable frame 20, and the movable side magnet 40 is held inside the opening 22 formed therein. Each magnetic pole surface of the movable side magnet 40 is provided so as to face the magnetic pole surfaces of the fixed side magnets 30 and 31 through the respective openings 22.

  The direction of magnetization in the fixed side magnets 30 and 31 and the movable side magnet 40 or the kind of magnetic poles to be magnetized are within a predetermined angular displacement range when the movable side magnet 40 is displaced relative to the fixed side magnets 30 and 31. As long as the rotational torque of the magnetic circuit formed by the fixed-side magnets 30 and 31 and the movable-side magnet 40 has an angular displacement-torque characteristic that decreases with an increase in the amount of change in angular displacement, it is not limited. Absent. In this embodiment, it is provided as shown in FIG.

  That is, the fixed-side magnet 30 fixed to one fixed frame 10 is different from the two substantially sector-shaped permanent magnets 30a and 30b magnetized in the direction facing the other fixed frame 11 (that is, in the thickness direction). The permanent magnet 31 arranged in an arc shape so that the poles are adjacent to each other and fixed to the other fixed frame 11 is composed of two substantially fan-shaped permanent magnets 31a and 31b that are similarly magnetized in the thickness direction. Adjacent and opposing permanent magnets 30a and 30b fixed to one fixed frame 10 are provided so that the same poles face each other. Further, the movable side magnet 40 is arranged along the rotational direction of the movable frame 20 and on the permanent magnets 30a and 31a side of the fixed side magnets 30 and 31 where the N poles face each other. It is provided so that the pole side is located.

  The magnetic spring mechanism 1 having such a configuration operates as follows. For example, as shown in FIGS. 4 and 5, the center of the movable side magnet 40 that operates in the rotational direction together with the movable frame 20 is the central portion in the arc direction of each fixed side magnet 30, 31, that is, one fixed side A position that coincides with the boundary between the two permanent magnets 30a and 30b constituting the magnet 30 and the boundary between the two permanent magnets 31a and 31b constituting the other fixed side magnet 31 is set as a neutral position. The neutral position is set to an angular displacement of 0 (deg), and the movable frame 20 is rotated about the shaft member 21 in the front-rear direction. An example of the angular displacement-torque characteristics obtained as a result is shown in FIG.

  As is apparent from FIG. 6, there is an angular displacement range in which the rotational torque (N · m) decreases as the change amount of the angular displacement increases in the angular displacement range of about −13 (deg) to about +13 (deg). You can see that it exists. Accordingly, if the movable frame 20 is urged in the rotational direction by an elastic member having an angular displacement-torque characteristic that increases the rotational torque in such a range, the superimposed angular displacement-torque characteristic in the angular displacement range is obtained. It becomes almost constant.

  FIG. 7 shows angular displacement-torque characteristics when a torsion bar as an elastic member is connected to the shaft member 21 of the movable frame 20. The torsion bar used here is the amount of change in angular displacement when the movable frame 20 of the magnetic spring mechanism 1 rotates from the rear (or front) to the front (or rear) through the neutral position from the neutral position. In the range in which the rotational torque decreases with increase, it has a spring characteristic with a positive inclination that is almost the same as the inclination. For this reason, in the angular displacement of about −13 (deg) to about +13 (deg), as the superimposed characteristics of the magnetic spring mechanism 1 and the torsion bar, as shown by the thick solid line in FIG. As the amount increases, a constant load region in which the spring constant at which the rotational torque does not change is substantially zero is generated.

  Therefore, when used in the suspension mechanism as shown in FIG. 8, when the arbitrary load body is placed on the support portion supported by the torsion bar and is in an equilibrium state, the movable frame 20 is provided in the magnetic spring mechanism 1. Is set so as to exist at the neutral position, a constant load region can be obtained in the range before and after the neutral position, and high vibration isolation performance can be obtained.

In the above embodiment, a torsion bar is used as an elastic member that generates torque having a positive spring characteristic in the rotation direction. Accordingly, there is an advantage that the configuration of the suspension mechanism (vibration isolation mechanism) using the torsion bar as shown in FIG. 8 can be simplified. However, any elastic member may be used as long as it can impart a positive spring characteristic in the rotation direction, and other metal springs such as a coil spring through a member connected to the movable frame 20 of the magnetic spring mechanism 1 or It is also possible to adopt a structure that uses a rubber or the like to urge. Moreover, in the said embodiment, although the fixed side magnets 30 and 31 are each arrange | positioned in a substantially circular arc shape, depending on the magnitude | size of a permanent magnet, the rotatable angle of the movable frame 20, etc., it can also arrange | position in a substantially linear form. . For the same reason, the permanent magnets 30a, 30b, 31a, 31b constituting the fixed magnets 30, 31 can be formed in a substantially square shape instead of a substantially sector shape. Moreover, in the said embodiment, although each fixed side magnet 30 and 31 is comprised by two permanent magnets and the movable side magnet 40 is comprised by one permanent magnet, the number of permanent magnets used is predetermined. The present invention is not limited as long as it has a negative spring characteristic region in which the rotational torque decreases in the angular displacement range.
Furthermore, although a vehicle suspension mechanism is illustrated as a specific application example of the vibration isolation mechanism, the present invention is not limited to this. The suspension mechanism shown in FIG. 8 combines a vibration damping mechanism composed of a magnet unit and an elastic member such as a torsion bar with a damper as a damping mechanism. For example, the suspension mechanism is applied to a vehicle seat or the like. In this case, viscoelastic urethane as a damping mechanism may be used in combination with the vibration isolation mechanism of the present invention.

FIG. 1 is an exploded perspective view showing a magnetic spring mechanism according to an embodiment of the present invention. FIG. 2 is an external view of the magnetic spring mechanism according to the embodiment. FIG. 3 is a side view of the magnetic spring mechanism according to the embodiment. FIG. 4 is a front view of the magnetic spring mechanism according to the embodiment. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a graph showing an example of angular displacement-torque characteristics of the magnetic spring mechanism according to the embodiment. FIG. 7 is a graph showing an example of the angular displacement-torque characteristic of the magnetic spring mechanism according to the embodiment, the angular displacement-torque characteristic of the torsion bar, and the angular displacement-torque characteristic in which the magnetic spring mechanism and the torsion bar are superimposed. It is. FIG. 8 is an external view showing a conventional suspension mechanism for a vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic spring mechanism 10,11 Fixed frame 20 Movable frame 21 Shaft member 30,31 Fixed side magnet 40 Movable side magnet

Claims (7)

A fixed-side magnet, and a movable-side magnet provided so as to be displaceable in the rotational direction relative to the fixed-side magnet.
An angular displacement-torque characteristic having an angular displacement range in which a rotational torque generated by a magnetic circuit composed of a fixed side magnet and a movable side magnet decreases with an increase in the amount of change in the angular displacement of the movable side magnet. Magnetic spring mechanism characterized by The stationary magnet is disposed in a substantially arc shape on the stationary frame;
The magnetic spring mechanism according to claim 1, wherein the movable side magnet is attached to a movable frame that can rotate in parallel along the arc direction of the fixed side magnet arranged in a substantially arc shape. Two fixed frames are arranged opposite to each other at a predetermined interval, and the fixed side magnet is provided in a substantially arc shape in each of the fixed frames,
The magnetic spring mechanism according to claim 2, wherein the movable frame is rotatably provided between the two fixed frames. The magnetic spring mechanism according to any one of claims 1 to 3,
In the angular displacement range in which the rotational torque of the magnetic spring mechanism decreases, an angular displacement-torque characteristic in which the rotational torque increases as the amount of change in the angular displacement of the movable magnet increases, and the movable magnet in the rotational direction is provided. An elastic member for biasing,
A vibration isolation mechanism characterized by combining the magnetic spring mechanism and the elastic member so that a rotational torque obtained by combining both in the angular displacement range is substantially constant.   The vibration isolation mechanism according to claim 4, wherein the elastic member includes a metal spring that urges the movable frame in a rotation direction.   6. The vibration isolation mechanism according to claim 5, wherein the metal spring comprises a torsion bar, and the movable frame is coupled to the torsion bar.   6. A vehicle suspension mechanism comprising: a base part; and a support part that supports an arbitrary load body, wherein the support part is elastically supported by the elastic member with respect to the base part. The vibration isolation mechanism according to any one of 4 to 6.

Images