JP2011256889A - Structure with damper within which magnetic fluid is encapsulated - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure in which a damper in which magnetic fluid is encapsulated is arranged between a support and a body to be supported, in which the easiness of operation for making the support hold the body to be supported is enhanced and the structure of the structure is simplified while enhancing the vibration attenuating effect by the damper.SOLUTION: In the structure, the damper 4 is a liquid encapsulating damper which is arranged in the door 3 and has the case 22 forming the liquid chamber 21 in which a magnetic fluid 20 is encapsulated. A pair of magnets constituted of the magnets 51, 52 magnetizing the magnetic fluid 20 are arranged in the vehicle body 2. The damper 4 comes into contact with the vehicle body 2 in a condition pushed and pressed by the door 3 and the vehicle body 2 in such an extent that the shape of the liquid chamber 21 changes compared to the time when the damper 4 does not contact with the vehicle body 2 when the door 3 is closed. The magnets 51, 52 increases the intensity of the magnetic field to the magnetic fluid 20 than the opened condition at the time point when the door 3 is switched from the opened condition to the closed condition.

Description

  The present invention relates to a structure in which a damper enclosing a magnetic fluid is disposed between a support and a supported body supported by the support. And in this structure, a support body and a to-be-supported body are the vehicle body and door of a vehicle, respectively.

In a vehicle, liquid is sealed in a weather strip disposed between a vehicle body provided with a door opening and a door attached to the vehicle body so that the door opening can be opened and closed, and the weather strip generates the liquid in the door. What attenuates vibration is known (see, for example, Patent Document 1).
Moreover, in order to improve the sealing performance between the door and vehicle body in a closed state, a vehicle is known that includes an electromagnet that magnetizes a magnetic fluid sealed in a weather strip (for example, Patent Documents). 2).
Further, as the liquid seal damper, a resistor that receives a drag force from the viscous fluid is disposed in a liquid chamber formed by a case including an inner cylinder, an outer cylinder, and an elastic wall that connects the inner cylinder and the outer cylinder. In addition, there is known one that attenuates vibration input from the axial direction of the liquid seal damper and the direction orthogonal to the axial direction (see, for example, Patent Document 3).

JP 2010-25285 A Japanese Utility Model Laid-Open No. 4-136968 (Claim 2, FIG. 4) JP-A-5-99267

  For example, in a vehicle, when a damper attached to the door is disposed between the vehicle body and the door in a closed state where the door is held at the closed position on the vehicle body, in order to increase the vibration damping effect by the damper, It is preferable that the damper, the vehicle body, and the door are in contact with each other reliably. However, regarding the relative position between the vehicle body and the door, it is not easy to eliminate the occurrence of variations within an allowable range based on tolerances and assembly errors. And, due to the variation, the gap between the vehicle body and the door is expanded, and play is formed between the damper and the vehicle body, and a reliable contact state between the damper and the vehicle body cannot be obtained. The vibration damping effect is reduced by the damper.

  Therefore, for example, by placing the damper so that the damper overlaps the vehicle body when the door is placed in the open state before the door is closed, the damper and the vehicle body are in a reliable contact state. Can be obtained. However, in this case, when closing the door until the door in the open state shifts to the closed state, only the part overlapping the vehicle body needs a force to deform the damper, so the door should be lightly closed. Is hindered, and the closing performance of the door is reduced. Therefore, generally, with respect to a supported body (for example, a vehicle door) that is supported in a retained state that is retained at a predetermined position by a support body (for example, a vehicle body), the supported body is retained in the retained state. The ease of work to do (for example, door closing work) is reduced.

The present invention has been made in view of such circumstances, and in a structure in which a damper in which a magnetic fluid is sealed is disposed between a support and a supported body, the vibration damping effect by the damper is improved. It is an object of the present invention to improve the ease of work for holding the supported body on the support while simplifying the structure of the structure.
Another object of the present invention is to reduce the size and weight of a structure including a damper.

  The invention according to claim 1 is a support body (2), and a support body (3) placed in a holding state held at a predetermined position by the support body (2) and a non-holding state before the holding state. ) And a damper (4) for attenuating the vibration of the supported body (3) in the holding state, the damper (4) includes the support (2) and the supported body (3). ) And a liquid seal damper including a case (22) that forms a liquid chamber (21) in which a magnetic fluid (20) is enclosed, and the support (2) and the supported body. The other member of (3) is provided with a magnetic generator (51, 52; 56, 57) that magnetizes the magnetic fluid (20), and the damper (4) is the damper ( 4) compared to when the other member is not in contact with the other member The magnetic generator (51, 52; 56, 57) is in contact with the other member while being pressed by the one member and the other member to such an extent that the shape of 1) changes. It is a structure that increases the strength of the magnetic field with respect to the magnetic fluid (20) when the support (3) shifts from the non-holding state to the holding state than in the non-holding state.

According to this, when the supported body is in a holding state with respect to the support body, the damper provided on one member of the support body and the supported body is supported while being pressed by the support body and the supported body. Since it abuts against the other member of the body and the supported body, no play is formed between the damper, the support body and the supported body, so that the vibration damping effect by the damper is enhanced.
In addition, the magnetic generator for magnetizing the magnetic fluid is provided on the other member. When the supported body is in the holding state, the magnetic field strength is higher than when the supported body is in the non-holding state. Since the size is increased, the resistance by the damper when the supported body shifts from the non-holding state to the holding state can be reduced, and the workability for holding the supported body in a predetermined position is improved.
Further, since a magnetic generator for setting the vibration damping performance of the damper is used in order to improve the ease of the work, a dedicated mechanism for improving the ease of the work becomes unnecessary, and the structure The structure is simplified.
As a result, in the structure in which the damper containing the magnetic fluid is disposed between the support and the supported body, the vibration damping effect by the damper is improved and the work for holding the supported body on the support is performed. And the structure of the structure is simplified.

According to a second aspect of the present invention, in the structure according to the first aspect, the magnetic generator (51, 52; 56, 57) includes the first magnetic generator (51; 56) and the second magnetic generator (52). 57), and the first magnetic generator (51; 56) and the second magnetic generator (52; 57) are the liquid chamber (21) in the first magnetic generator (51; 56). The magnetic pole (51a; 56a) on the side differs from the magnetic pole (52a; 57a) on the liquid chamber (21) side in the second magnetic generator (52; 57), and the first magnetic generator (51; 56) when the magnetic flux between the magnetic pole (51a; 56a) of the second magnetic generator (52; 57) and the magnetic pole (52a; 57a) of the second magnetic generator (52) is in the holding state. It arrange | positions so that the said liquid chamber (21) may be penetrated.
According to this, since the magnetic flux between the different magnetic poles by the first and second magnetic generators penetrates the liquid chamber, the magnetic fluid in the liquid chamber can be efficiently magnetized and has the required vibration damping performance. The damper can be reduced in size and weight, and it becomes easier to increase the strength of the magnetic field against the magnetic fluid.

According to a third aspect of the present invention, in the structure according to the second aspect, the magnetic pole (51b; 56b) of the first magnetic generator (51; 56) opposite to the liquid chamber (21) side; The magnetic pole (52b; 57b) opposite to the liquid chamber (21) side of the second magnetic generator (52; 57) is connected by a magnetic path forming member (53) formed of a ferromagnetic metal. It is what has been.
According to this, since different magnetic poles are connected by the magnetic path forming member, the leakage magnetic flux from the first and second magnetic generators can be reduced, and the magnetic generator can be downsized. Weight reduction is possible. Further, since the magnetic path forming member is a ferromagnetic metal, the rigidity of the other member is increased.

According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, the other member includes the damper (4) when the supported body (3) is in the holding state. It has a receiving part (14) that comes into contact, and the receiving part (14) is provided on the outer surface side of the surface forming member that forms the outer surface of the other member, and the surface forming member is made of a nonmagnetic material. The magnetic generators (51, 52; 56, 57) are arranged on the back side of the surface forming member.
According to this, since the surface forming member is a non-magnetic material, the magnetic flux generated by the surface forming member provided with the magnetic generator is reduced, and the magnetic generator can be reduced in size, and thus the structure can be reduced in size and weight. Is possible.
Further, since the magnetic force generator is arranged on the back surface side of the surface forming member, the magnetic generator is not exposed to the outer surface of the surface forming member, so that the surface forming member on which the receiving portion with which the damper abuts is formed. The appearance of is improved.

The invention according to claim 5 is the structure according to any one of claims 1 to 4, wherein the case (22) includes the liquid between the inner member (23) and the inner member (23). The outer cylinder (24) disposed so as to surround the inner member (23) with the chamber (21) interposed therebetween is connected to the inner member (23) and the outer cylinder (24), and the liquid chamber (21) is connected to the outer cylinder (24). A pair of connecting walls (28) disposed between the liquid chamber (21) and the inner member (23), the outer cylinder (24), and the pair of connecting walls (28). It is formed in a cylindrical shape, and the outer cylinder (24) abuts on the other member and is made of a nonmagnetic material.
According to this, since the outer cylinder is a nonmagnetic material, magnetic flux leakage through the outer cylinder is reduced, and it becomes easy to pass the magnetic flux through the cylindrical liquid chamber. The damper can be efficiently magnetized, and the damper having the required vibration damping performance can be reduced in size and weight, and the strength of the magnetic field against the magnetic fluid can be easily increased.

According to a sixth aspect of the present invention, in the structure according to the fifth aspect, the outer cylinder (24) includes a cylindrical main body (25) formed of a nonmagnetic material and an axial direction of the main body (25). And a pair of annular end members (26, 27) formed of ferromagnetic material, and the end members (26, 27) are coupled to each other and the connecting wall (28). When the supported body (3) is in the holding state, it is arranged to face the magnetic generator (51, 52; 56, 57).
According to this, the magnetic flux from the magnetic generator can be passed over the entire circumference of the cylindrical liquid chamber through the end member of the ferromagnetic material, so that the magnetic fluid in the liquid chamber can be efficiently magnetized. The number of magnetic generators can be reduced, and a damper having required vibration damping performance can be reduced in size and weight.

According to a seventh aspect of the present invention, in the structure according to the first to sixth aspects, the case (22) protrudes into the liquid chamber (21) and between the magnetic fluid (20). Resistors (31, 32) that receive a drag force from the magnetic fluid (20) by relative movement are provided, and the resistors (31, 32) are made of a non-magnetic material.
According to this, since the resistor that protrudes into the liquid chamber is provided in the case forming the liquid chamber, the vibration damping effect by the damper is enhanced. Further, since the resistor is a non-magnetic material, generation of a magnetic force with the magnetic fluid is prevented, and a required vibration damping performance can be obtained.

The invention according to claim 8 is the structure according to any one of claims 1 to 7, wherein the supported body (3) has a peripheral portion (11), and the peripheral portion (11) Of one edge part (11a) supported by the said support body (2) so that rotation is possible centering | focusing on a dynamic center line (Ld), and the said rotation center line (Ld) among the said peripheral parts (11) It has the other edge (11b) opposite to the one edge (11a) in the orthogonal direction, and the damper (4) is arranged on the other edge (11b).
According to this, since the displacement of the other edge portion of the supported body is restrained by the damper in the supported body that is constrained so as to be rotatable at one edge portion, the supported body in the holding state is supported. The restraining force of the body is increased, the vibration of the supported body is suppressed, and the rigidity of the supported body when the supported body is in the holding state is increased.

The invention according to claim 9 is a support (2), and a support (3) placed in a holding state held at a predetermined position by the support (2) and a non-holding state before entering the holding state. ) And a damper (4) for attenuating the vibration of the supported body (3) in the holding state, the damper (4) includes the support (2) and the supported body (3). ) Is a liquid seal damper in which a magnetic fluid (20) is sealed in a liquid chamber (21), and the magnetic support (2) or the supported body (3) includes the magnetic sealant. Magnetic generators (51, 52; 56, 57) for magnetizing the fluid (20) are provided, and the damper (4) has the shape of the liquid chamber (21) in the holding state so that the damper (4) Is not in contact with the other member of the support (2) and the supported body (3) The magnetic generator (51, 52; 56, 57) is in contact with the other member in a state of being pressed by the one member and the other member to such an extent that the magnetic chamber (51, 52; 56, 57) is changed. The energization amount is controlled by an energization control device (60) so as to control the strength of the magnetic field in (21), and the energization control device (60) is configured such that the supported body (3) is not held. It is a structure that controls the energization amount so as to increase the strength of the magnetic field with respect to the magnetic fluid (20) at the time of transition from the state to the holding state than in the non-holding state.
According to this, the strength of the magnetic field with respect to the magnetic fluid is changed according to the holding state and the non-holding state of the supported body by the electromagnet controlled by the energization control device, and the same effect as the first aspect can be obtained. Is done.

According to a tenth aspect of the present invention, in the structure according to the ninth aspect, the damper (4) and the electromagnet are provided on the supported body (3).
According to this, since the damper and the electromagnet are provided on the support body, the supported body is reduced in weight, and the workability for holding the support body on the support body is improved.

According to the present invention, in a structure in which a damper enclosing a magnetic fluid is disposed between a support and a supported body, the vibration damping effect by the damper is improved, and the supported body is held by the support. Therefore, the ease of work for improving the structure can be simplified.
Furthermore, according to the present invention, the structure including the damper can be reduced in size and weight.

It is a schematic left view of the principal part of a motor vehicle provided with the structure which is embodiment of this invention. 1A is a schematic left side view of a main part of the vehicle body, and FIG. 1B is a schematic right side view of a side door (left front door). The damper with which the motor vehicle of FIG. 1 is equipped is shown, (a) is a perspective view, (b) is the bb sectional view taken on the line of (a). It is the figure which looked at the principal part of the structure when the side door of the car of Drawing 1 is in a closed state from the axial direction of a damper. It is the VV sectional view taken on the line of FIG. FIG. 5 shows a modified embodiment of the embodiment of FIG. 1 and corresponds to FIG. FIG. 4 shows a modified embodiment of the embodiment of FIG. 1 and corresponds to FIG. FIG. 4 shows a modified embodiment of the embodiment of FIG. 1 and corresponds to FIG. FIG. 2 is a block diagram of a modified embodiment of the embodiment of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
Referring to FIG. 1, a structure according to an embodiment of the present invention (hereinafter simply referred to as “structure”) is provided in an automobile 1 that is a vehicle as a device.
Referring also to FIG. 2, the structure can open and close a vehicle body 2 as a support body that is a component of the automobile 1 and a door opening 2 a that is an opening provided in the vehicle body 2, and the door opening. A damper 4 comprising a side door 3 as an opening / closing body that is one or more supported bodies movable relative to 2a, a liquid seal damper that attenuates vibrations input from the side door 3 and the vehicle body 2, and a damper And a magnetism generating member 5 (see FIG. 5) having magnets 51 and 52 (see FIG. 5) as magnetism generators for magnetizing the magnetic fluid 20 (see FIG. 3 (b)) sealed in the magnet 4.
The magnetic fluid 20 increases in viscosity as the magnetic field strength with respect to the magnetic fluid 20 increases.

  A side door 3 (hereinafter referred to as “door 3”) as a door is a pivotable door that is pivotable about a pivot center line La that is supported by the vehicle body 2 by a hinge 6 and extends in the vertical direction. It is. In this embodiment, the door 3 is used as a pair of left and right front doors 3a and a pair of left and right rear doors 3b. In FIG. 1, only the left door 3 is shown.

  In the embodiment, the up-down direction, the front-rear direction, and the left-right direction are directions when the automobile 1 is used as a reference. In addition, the expression “extending in a direction” includes a case where it extends parallel to the direction and a case where it extends inclined in the direction.

  The vehicle body 2 has four support-side peripheral portions 10 (the left peripheral portion 10 is shown in FIG. 1) that form four door openings 2 a that are opened and closed by the doors 3. A peripheral portion 10 that is a part of the outer panel 7 as a surface forming member that forms the outer surface 7 a of the vehicle body 2 is a member that defines a rotation center line La and a hinge as an attachment member that attaches the door 3 to the vehicle body 2. 6 is a front edge portion 10a which is one edge portion provided across the door 3 and a direction perpendicular to the rotation center line La in the peripheral edge portion 10 (hereinafter, simply referred to as “orthogonal direction”). The rear edge portion 10b as the other edge portion opposed to the front edge portion 10a, and the direction between the front edge portion 10a and the rear edge portion 10b in the orthogonal direction and parallel to the rotation center line La ( Or it has the upper edge part 10c and the lower edge part 10d which are a pair of edge parts which oppose in an up-down direction. Therefore, the door 3 is restrained in a state where the door 3 can be rotated at the front edge portion 10a.

The door 3 is placed in a closed state as a holding state held at a closed position as a predetermined position with respect to the peripheral edge portion 10 and an open state as a non-holding state before entering the closed state. When the door 3 is in the closed state, the door 3 is locked by the door lock mechanism 9 (FIG. 2A shows a striker 9a that is a component of the door lock mechanism 9). 2 is kept closed.
In the following description, the expressions “closed state” and “open state” simply mean that the door 3 is in the closed state and the open state, respectively.

The door 3 has a supported-side peripheral portion 11 as a supported-side fitting portion that is fitted to a peripheral portion 10 as a supporting-side fitting portion when in the closed state. A peripheral edge 11 that is a part of the inner panel 8 as a surface forming member that forms an outer surface inside the door 3 is provided with a hinge 6 and a front edge 11a as one edge in the orthogonal direction. And the rear edge portion 11b as the other edge portion of the peripheral edge portion 11 facing the front edge portion 11a in the orthogonal direction, and located between the front edge portion 11a and the rear edge portion 11b in the orthogonal direction. In addition, the upper edge portion 11c and the lower edge portion 11d are a pair of edge portions facing each other in a direction parallel to the rotation center line La.
Therefore, the front edge part 10a, the rear edge part 10b, the upper edge part 10c, and the lower edge part 10d of the peripheral part 10 of the vehicle body 2 are the front edge part 11a, the rear edge part 11b, and the upper edge part of the peripheral part 11 of the door 3. 11c and the lower edge 11d, respectively.

At least one, here, three dampers 4 are fixedly provided on the door 3 as one member of the vehicle body 2 and the door 3. Each damper 4 includes a first portion 3u near the uppermost part of the inner panel 8 and closest to the window 3c in the direction parallel to the rotation center line La at the rear edge part 11b, and the lowermost part of the inner panel 8 The second part 3d that is near and closest to the lowest part of the door 3 and the third part 3m between the first and second parts 3u and 3d are arranged.
On the other hand, the vehicle body 2 as the other member of the vehicle body 2 and the door 3 has the same number of receiving portions 14 as the contacted portions with which the damper 4 abuts in the closed state. Each receiving portion 14 is arranged in the first to third portions 2u, 2d, and 2m corresponding to the first to third portions 3u, 3d, and 3m in the rear edge portion 10b corresponding to the position of the damper 4. .
The first parts 2u and 3u are in the vicinity of the waist line, the second parts 2d and 3d are in the vicinity of the lower edge portions 10 and 11, and the third parts 2m and 3m are in the vicinity of the door lock mechanism 9. .

Referring to FIG. 3, a cylindrical damper 4 having a damper axis Ld as a central axis of the damper 4 and having a columnar shape includes a case 22 forming a liquid chamber 21 in which a magnetic fluid 20 is sealed, and a sealed liquid. Disks 31 and 32 are provided as resistors that are disposed in the chamber 21 and receive a drag force by relative movement with the magnetic fluid 20. A group of one or more, which is composed of three disks 31 and 32 as a plurality here, is fixed to the case 22 so that vibration transmitted to the damper 4 is transmitted through the case 22. And a projecting portion extending in a radial direction from the case 22.
Each disk 31, 32 generates a flow resistance in the magnetic fluid 20 by relative movement between the magnetic fluid 20 due to the flow of the magnetic fluid 20 due to the shape change of the case 22 or the liquid chamber 21, Due to the shape of the fluid 32, a fluid pressure difference is generated, and a frictional force (or a shear resistance force of the magnetic fluid 20) is generated due to contact with the magnetic fluid 20.

The case 22 includes a cylindrical inner cylinder 23 as an inner member which is a first member extending through the liquid chamber 21 in the axial direction as a first direction parallel to the damper axis Ld, and an inner cylinder in the radial direction. A cylindrical outer cylinder 24 as an outer member, which is a second member arranged with the liquid chamber 21 sandwiched between them, and an inner cylinder 23 and an outer cylinder 24 arranged coaxially and connected in the axial direction And one or more elastic walls 28 serving as a pair of connecting walls, which are arranged apart from each other with the liquid chamber 21 therebetween. The outer cylinder 24 surrounds the inner cylinder 23 and is arranged coaxially with the inner cylinder 23, and the damper axis Ld is the central axis of the inner cylinder 23 and the outer cylinder 24.
The radial direction and the circumferential direction are respectively a radial direction and a circumferential direction centered on the damper axis Ld, and a direction perpendicular to the axial direction (and hence the damper axis Ld) is an axis orthogonal direction as a second direction. Suppose there is. Therefore, the radial direction is included in the axis orthogonal direction.

  The inner cylinder 23 is detachably coupled to a coupling portion 12 (see FIGS. 2B, 4 and 5) of the rear edge portion 11 by a bolt 13a and a nut 13b (see FIG. 5) as coupling means. It is attached. Therefore, the inner cylinder 23 is an attachment portion to the door 3 in the damper 4. As another example, the coupling means may be welding.

  The outer cylinder 24 whose inner diameter is larger than the outer diameter of the inner cylinder 23 is fixed to a cylindrical main body 25 and both ends of the main body 25 in the axial direction by a plurality of bolts 29 as coupling means. And a pair of first and second end members 26 and 27 having an annular shape or a cylindrical shape. Since each end member 26, 27 is provided with an elastic wall 28, the end members 26, 27 are also connecting members that connect the elastic wall 28 and the main body 25.

The whole or most of the liquid chamber 21 is formed into a cylindrical shape, here a cylindrical shape, by the inner cylinder 23, the main body 25 and a pair of elastic walls 28.
The pair of annular elastic walls 28 as a ring is formed of an elastic material having rubber-like elasticity (for example, rubber) and can be elastically deformed, and is coupled to the inner cylinder 23 at the inner periphery thereof, and the outer periphery thereof. Are coupled to the end members 26 and 27 respectively.

The disk group is provided with one or more, in this case, one annular shape, in which an inner peripheral portion 31i is fixed to the inner cylinder 23, extends radially outward from the inner cylinder 23, and the outer peripheral portion 31o is a free end. The inner disk 31 and the outer peripheral portion 32o are fixed to the main body 25 and extend radially inward from the main body 25, and the inner peripheral portion 32i is a free end. And an annular outer disk 32.
The inner disks 31 and the outer disks 32 are alternately arranged at intervals in the axial direction and are arranged so as to have overlapping portions that overlap each other in the radial direction and the entire circumference.

  Referring to FIGS. 4 and 5, each receiving portion 14 that is a part of the outer panel 7 is provided in a notch shape in the step portion of the rear edge portion 10 b (see also FIG. 2A), and the damper 4 is It is comprised by the recessed part which forms the accommodation space 40 accommodated. When the door 3 (see FIG. 1) is in the closed state, the receiving portion 14 is in contact with the bottom wall 41 that abuts in a state where the end member 26 is pressed in the axial direction or the opening / closing direction of the door 3 by the abutting portion 26a. And a peripheral wall 42 connected to the bottom wall 41. The main body 25 and the end members 26 and 27 abut against the peripheral wall 42 in a state of being pressed in the radial direction by the respective abutting portions 25c, 26c and 27c, including when the door 3 is closed. Therefore, the outer cylinder 24 has the contact part 26a in the axial direction with the receiving part 14, and the contact parts 25c, 26c, and 27c in the radial direction.

  Here, the opening / closing direction of the door 3 is the position of the door 3 when the damper 4 starts to contact the receiving portion 14 in the open state (in FIG. 5, the end member 26 is the guide surface 43a unless otherwise specified). When the door 3 occupies a position from the position close to the closed state to the closed position, the opening and closing direction when the door 3 occupies the position from the position close to the closed state to the closed position is defined as the axial direction in the closed state. Almost matches.

  Further, the peripheral wall 42 located in the radial direction with respect to the damper 4 in the closed state (or in the direction orthogonal to the axis of the damper 4 in the closed state and the direction orthogonal to the opening / closing direction of the door 3) 3 has a guide part 43 having a guide surface 43a against which the end member 26 abuts when the damper 4 starts to enter the receiving part 14 when the damper 4 shifts from the open state to the closed state. The guide surface 43 a is an inclined surface formed by a tapered surface that expands in the opening direction of the door 3. The damper 4 is guided by the guide surface 43 a and smoothly enters the receiving portion 14.

  The end members 26 and 27 are pressed toward the bottom wall 41 by the door 3 in the closed state in the opening / closing direction or the axial direction of the door 3, so that the damper 4 is pressed by the door 3 and the receiving portion 14. Therefore, as shown in FIG. 5, the inner cylinder 23 and the inner disks 31, 32 are shown in a state where the damper 4 is not in contact with the receiving portion 14 (FIG. 3B, and a part is shown in FIG. 5. Compared to the case of “natural state”), the outer cylinder 24 is displaced in the closing direction in the opening / closing direction of the door 3 (downward in FIG. 5). Occupy position.

In addition, the damper 4 provided on the door 3 and the receiving portion 14 provided on the vehicle body 2 are overloaded at the outer cylinder 24 and the peripheral wall 42 when the damper 4 is in a natural state when viewed from the opening / closing direction of the door 3. It is in a positional relationship to wrap.
For this reason, in the closed state, the damper 4 is in a state of being pressed in the radial direction by the door 3 to which the inner cylinder 23 is attached and the vehicle body 2 having the peripheral wall 42 with which the outer cylinder 24 abuts. Therefore, as shown in FIG. 5, the outer cylinder 24, together with the outer disk 32, is closer to the side where the peripheral wall 42 is located with respect to the damper axis Ld and the inner cylinder 23 than when the damper 4 is in a natural state. Occupies a position displaced to the opposite side (left side in FIG. 5). At this time, the contact portions 25c, 26c, and 27c, which are a part of the outer peripheral surface of the outer cylinder 24, have a smaller radial distance from the damper axis Ld than when the damper 4 is in a natural state. The abutting portions 25c, 26c, and 27c are in positions close to the damper axis Ld and the inner cylinder 23 in the radial direction.

  Thus, when the door 3 is in the closed state, the damper 4 has the receiving portions of the door 3 and the vehicle body 2 to such an extent that the shapes of the case 22 and the liquid chamber 21 change compared to when the damper 4 is in the natural state. 14 is pressed and deformed, and the volume of the liquid chamber 21 changes.

  The magnetism generating member 5 provided in the receiving portion 14 includes one or more, in this case, a plurality of ten, arranged in the receiving portion 14 on the back surface 7b side opposite to the outer surface 7a side where the damper 4 is located. A connection that connects a magnet group composed of permanent magnets 51 and 52 and a first magnet 51 and a second magnet 52 that constitute a magnet pair 50 that is a pair of magnets spaced apart in the axial direction. And a magnetic path forming member 53 as a member. The magnet group is composed of one or more pairs, here, five pairs of magnets 50 as a plurality of pairs.

The first and second magnets 51 and 52 in each magnet pair 50 are arranged at substantially the same angular position in the circumferential direction, and further, the magnetic pole 51a (for example, S pole) on the liquid chamber 21 side and the second in the first magnet 51. A position where the magnet 52 is different from the magnetic pole 52a (for example, N pole) on the liquid chamber 21 side, and the magnetic flux between the magnetic pole 51a and the magnetic pole 52a penetrates the liquid chamber 21 when the door 3 is in the closed state. In this embodiment, it is arranged at a position penetrating in the axial direction.
The plate-like magnetic path forming member 53 includes a magnetic pole 51b (for example, N pole) opposite to the liquid chamber 21 side of the magnet 51 and a magnetic pole 52b opposite to the liquid chamber 21 side of the magnet 52. (For example, S pole).

The magnet 51 fixed to the bottom wall 41 is in surface contact with the back surface 41b of the bottom wall 41, and the magnet 52 fixed to the peripheral wall 42 is in contact with the back surface 42b on the surface 42b. is doing.
In the closed state of the door 3, the end member 26 faces the magnet 51 in the axial direction, with the bottom wall 41 interposed therebetween, and with the maximum facing area in the process of the door 3 shifting from the open state to the closed state. In addition, the end member 27 faces the magnet 52 in the radial direction with the peripheral wall 42 interposed therebetween and with the maximum facing area in the process of the door 3 shifting from the open state to the closed state.
Further, in the closed state of the door 3, the distance between the end member 26 and the magnet 51 in the axial direction is the minimum distance in the process of shifting from the open state to the closed state, and the end member 27 in the radial direction. The distance between the magnet 52 and the magnet 52 is the minimum distance in the process of shifting from the open state to the closed state.
Further, when the door 3 is opened and closed between the open state and the closed state, the damper 4 is in a natural state (see FIG. 3b) and a pressed state in which the damper 4 is pressed by the receiving portion 14 (for example, shown in FIG. 5). The position in the vicinity of the closed state, which is the position of the door 3 when switching to the state) is set as the pressing start position, and the closed position (the position shown in FIG. 5) in which the door 3 is in the pressed state is the pressing completion position. Then, at the pressing completion position, the magnet 51 and the entire contact portions 26a, 26c, and 27c of the end members 26 and 27, and the magnet 52 and the entire contact surface 27c of the end member 27 are In both the radial direction and the axial direction, they are closer to each other than at the pressing start position.

  Due to such an arrangement of the first and second magnets 51 and 52, the strength of the magnetic field with respect to the magnetic fluid 20 formed by the magnets 51 and 52 at the time of transition from the open state to the closed state is higher than that in the open state. Is larger in the closed state and maximum in the closed state.

Hereinafter, forming materials for the damper 4, the receiving portion 14, the magnetic generation member 5, and the like will be described.
The inner cylinder 23, the main body 25, the disks 31, 32, the outer panel 7, the bolts 13a, 29, and the nut 13b are non-magnetic materials (for example, non-magnetic metals (for example, aluminum and magnesium are included), resins, and composites. Material is included). Therefore, the receiving portion 14 is formed of a nonmagnetic material, and the bottom wall 41 and the peripheral wall 42 are formed of a nonmagnetic material. The inner cylinder 23 and the main body 25 are preferably formed of a nonmagnetic metal in order to increase the rigidity.
Since the outer panel 7 which is a forming member of the receiving portion 14 is formed of a nonmagnetic material, the bottom wall 41 and the peripheral wall 42 are formed of a nonmagnetic material.
Each of the end members 26 and 27 and the magnetic path forming member 53 are formed of a ferromagnetic material (for example, iron or nickel which is a ferromagnetic metal is included). Each end member 26, 27 is made of ferromagnetic metal to increase the rigidity of the end member 26, 27 and the main body 25, and the magnetic path forming member 53 is made of ferromagnetic metal to increase the rigidity of the receiving portion 14. Preferably it is formed.
The elastic material forming the elastic wall 28 may be a non-magnetic material or a ferromagnetic material. In the case of a ferromagnetic material, the strength of the magnetic field with respect to the magnetic fluid 20 can be further increased.
Moreover, each disk 31 and 32 may be formed with the said elastic material. As a result, when the discs 31 and 32 come into contact with each other or the discs 31 and 32 come into contact with the inner cylinder 23, the outer cylinder 24, or the elastic wall 28, the occurrence of breakage or contact noise due to the contact is suppressed. Is done.

Next, operations and effects of the embodiment configured as described above will be described.
The damper 4 can be elastically deformed in each of the axial direction, the radial direction (or the axial orthogonal direction), and the circumferential direction around the inner cylinder 23. When the door 3 is in the closed state, the disks 31 and 32 mainly move in the axial direction relative to the vibration as the first vibration input to the damper 4 from the axial direction. At this time, the flow resistance is generated in the magnetic fluid 20 by the disks 31 and 32, and the vibration is attenuated by acting on the drag force based on the pressure difference due to the shape of the disks 31 and 32. Further, with respect to the vibration as the second vibration input from the radial direction, a drag force based on the frictional force of the magnetic fluid 20 is generated when each of the disks 31 and 32 moves relatively in the radial direction. The vibration is attenuated.
For this reason, the damper 4 attenuates the vibration of the door 3 and the vehicle body 2, further suppresses the transmission of vibration between the door 3 and the vehicle body 2, and reduces the vibration of the door 3 and the vehicle body 2.

In the structure, the damper 4 is a liquid seal damper provided on the door 3 and including a case 22 that forms a liquid chamber 21 in which the magnetic fluid 20 is sealed. The vehicle body 2 magnetizes the magnetic fluid 20. A magnet pair 50 composed of first and second magnets 51 and 52 is provided, and the damper 4 is more liquid than when the damper 4 is not in contact with the receiving portion 14 of the vehicle body 2 in the closed state of the door 3. In a state where the chamber 21 is pressed by the door 3 and the receiving portion 14 to such an extent that the shape of the chamber 21 changes, the magnets 51 and 52 are in an open state with respect to the moving door 3. At the time of shifting from the closed state to the closed state, the magnetic field strength with respect to the magnetic fluid 20 is set larger than that in the open state.
With this structure, when the door 3 is in the closed state with respect to the vehicle body 2, the damper 4 abuts against the receiving portion 14 while being pressed by the receiving portion 14 and the door 3. Since no play is formed with the damper 3, the vibration damping effect by the damper 4 is enhanced.
In addition, the magnets 51 and 52 that magnetize the magnetic fluid 20 are provided in the receiving portion 14, and when the door 3 is in the closed state, the magnetic field to the magnetic fluid 20 is larger than when the door 3 is in the open state. Since the strength is increased, the resistance by the damper 4 when the door 3 transitions from the open state to the closed state can be reduced, and the ease of work for holding the door 3 in the closed state in the closed position is improved. Therefore, the closing property of the door 3 is improved, and the lightness of the door closing can be ensured.
Furthermore, in order to improve the ease of the door closing operation, the magnets 51 and 52 that set the vibration damping performance of the damper 4 are used, so that a dedicated mechanism for improving the door closing ease becomes unnecessary. The structure of the structure is simplified.
As a result, in the structure in which the damper 4 enclosing the magnetic fluid 20 is disposed between the vehicle body 2 and the door 3, the vibration damping effect by the damper 4 is improved, and the ease of the door closing operation is improved. Furthermore, the structure of the structure is simplified.

The magnets that magnetize the magnetic fluid 20 are the first magnet 51 and the second magnet 52, and the first and second magnets 51 and 52 are the magnetic pole 51 a on the liquid chamber 21 side of the magnet 51 and the liquid chamber 21 side of the magnet 52. And the magnetic flux between the magnetic pole 51a and the magnetic pole 52a is arranged to penetrate the liquid chamber 21 when the door 3 is in the closed state.
With this structure, since the magnetic flux between the different magnetic poles 51a and 52a by the first and second magnets 51 and 52 penetrates the liquid chamber 21, the magnetic fluid 20 in the liquid chamber 21 can be efficiently magnetized. The damper 4 having the required vibration damping performance can be reduced in size and weight, and the magnetic field strength with respect to the magnetic fluid 20 can be easily increased.

  A magnetic path forming member in which a magnetic pole 51b of the first magnet 51 opposite to the liquid chamber 21 and a magnetic pole 52b of the second magnet 52 opposite to the liquid chamber 21 are formed of a ferromagnetic metal. Since the different magnetic poles 51b and 52b are connected to each other by the magnetic path forming member 53, the magnetic flux leakage from both the magnets 51 and 52 can be reduced, and the magnets 51 and 52 can be downsized. As a result, the structure can be reduced in size and weight. Further, since the magnetic path forming member 53 is a ferromagnetic metal, the rigidity of the receiving portion 14 is increased.

The vehicle body 2 has a receiving portion 14 with which the damper 4 abuts when the door 3 is closed. The receiving portion 14 is provided on the outer surface 7a side of the outer panel 7 that forms the outer surface 7a of the vehicle body 2, and the outer panel 7 is formed of a non-magnetic material, and the first and second magnets 51 and 52 are disposed on the back surface 7 b side of the outer panel 7.
With this structure, since the outer panel 7 is a non-magnetic material, the leakage magnetic flux due to the outer panel 7 provided with the magnets 51 and 52 can be reduced, and the magnets 51 and 52 can be downsized. Can be realized. Further, since the magnets 51 and 52 are arranged on the back surface 7b side of the outer panel 7, the magnets 51 and 52 are not exposed to the outer surface 7a of the outer panel 7, so that the receiving portion 14 with which the damper 4 abuts is formed. The appearance of the outer panel 7 is improved.
As another example, in order to reduce the leakage magnetic flux in the receiving part 14 provided with the magnets 51 and 52, even if the outer panel 7 has at least a part forming the receiving part 14 formed of a nonmagnetic material. Good.

The case 4 of the damper 4 connects the inner cylinder 23, the outer cylinder 24 disposed so as to surround the inner cylinder 23 with the liquid chamber 21 between the inner cylinder 23, and the inner cylinder 23 and the outer cylinder 24. The liquid chamber 21 includes a pair of elastic walls 28 arranged with the liquid chamber 21 interposed therebetween. The liquid chamber 21 is formed into a cylindrical shape by an inner cylinder 23, an outer cylinder 24, and a pair of elastic walls 28. In addition to being in contact with the receiving portion 14 of the vehicle body 2, it is formed of a nonmagnetic material.
With this structure, since the outer cylinder 24 is a non-magnetic material, magnetic flux leakage through the outer cylinder 24 is reduced, and it becomes easy to pass the magnetic flux through the cylindrical liquid chamber 21. The magnetic fluid 20 can be efficiently magnetized, the damper 4 having the required vibration damping performance can be reduced in size and weight, and the strength of the magnetic field against the magnetic fluid 20 can be easily increased.

The outer cylinder 24 includes a cylindrical main body 25 formed of a non-magnetic material, a pair of annular end portions formed of a ferromagnetic material, and an axial end portion and a connecting wall of the main body 25 coupled to each other. The first and second end members 26 and 27 are disposed to face the first and second magnets 51 and 52, respectively, when the door 3 is in the closed state.
With this structure, the magnetic flux from each of the magnets 51 and 52 can be passed over the entire circumference of the cylindrical liquid chamber 21 via the corresponding end members 26 and 27 of the ferromagnetic material. The magnetic fluid 20 in the chamber 21 can be magnetized efficiently, or the number of magnets 51 and 52 can be reduced, and the damper 4 having the required vibration damping performance can be reduced in size and weight.
In addition, since the end members 26 and 27 are made of a ferromagnetic metal, the rigidity of the main body 25 can be increased and the rigidity of the outer cylinder 24 can be increased by the annular end members 26 and 27.

  The case 22 is provided with a disk group including a plurality of disks 31 and 32 that protrude into the liquid chamber 21 and receive a drag force from the magnetic fluid 20 by relative movement with the magnetic fluid 20. The disks 31 and 32 are made of a non-magnetic material, so that the vibration damping effect by the damper 4 is enhanced. Further, since the disks 31 and 32 are non-magnetic materials, generation of magnetic force with the magnetic fluid 20 is prevented, and the required vibration damping performance can be obtained.

The peripheral edge 11 of the door 3 has a front edge 11a that is supported by the vehicle body 2 so as to be rotatable about a rotation center line La, and a front edge in a direction perpendicular to the rotation center line La among the peripheral edges 11. The damper 4 is disposed on the rear edge portion 11b.
With this structure, in the door 3 constrained to be rotatable at the front edge portion 11a, the displacement of the rear edge portion 11b of the door 3 is suppressed by the damper 4, so that the door 3 is restrained in the closed state. The force is increased, the vibration of the door 3 is suppressed, and the rigidity of the vehicle body 2 when the door 3 is in the closed state is increased. Furthermore, the damper 4 is arranged near the uppermost part and the lowermost part of the inner panel 8, so that the restraint property of the door 3 in the closed state is improved.

Hereinafter, a modified embodiment in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration. In addition, in the following modified embodiment, the same code | symbol as the code | symbol in the said embodiment is attached | subjected to the same member as the member in the said embodiment, or a corresponding member.
As shown in FIG. 6, only one set of a magnet pair 55 composed of a first magnet 56 and a second magnet 57 arranged on the back surface 42 b side of the peripheral wall 42 of the receiving portion 14 is arranged in the circumferential direction. Alternatively, the cylindrical liquid chamber 21 may be disposed so as to face the end member 27 in the radial direction at an interval substantially equal to the maximum outer diameter of the cylindrical liquid chamber 21 and when the door 3 is in the closed state. In this case, the magnetic flux between the magnetic pole 56a (for example, the N pole) and the magnetic pole 57a (for example, the S pole) passes through the liquid chamber 21 when the door 3 is in the closed state and passes through in the radial direction. Has been placed.
Thereby, the magnetic flux between the different magnetic poles 56a, 57a by the first and second magnets 56, 57 penetrates the liquid chamber 21 in the radial direction in the vicinity of the damper axis Ld, so that the magnetic fluid 20 in the liquid chamber 21 is efficiently passed. The damper 4 that can be magnetized and has the required vibration damping performance can be reduced in size and weight, and the strength of the magnetic field against the magnetic fluid 20 can be easily increased.
Similarly to the embodiment, a magnetic path forming member that connects the magnetic pole 56b (for example, the S pole) and the magnetic pole 57b (for example, the N pole) may be provided, and the first and second magnets 56 may be provided. , 57 may be arranged to face the end member 26 in the radial direction or the axial direction when the door 3 is in the closed state.

As shown in FIG. 7, a flange portion 31 a as a protruding portion that protrudes and extends in the axial direction may be provided on the outer peripheral portion 31 o of the inner disk 31. As a result, when the inner cylinder 23 and the outer cylinder 24 are moved in the radial direction, the drag acting on at least one of the inner cylinder 23 and the outer cylinder 24 is increased, and the damping performance of vibration input from the radial direction is improved. To do.
In addition, the flange part as a protrusion part may be provided in the inner peripheral part 32i of the outer side disk 32 similarly to the flange part 31a as a protrusion part. Further, the flange portion may be a portion other than the outer peripheral portion 31 o in the inner disk 31, and may be a portion other than the inner peripheral portion 32 i in the inner disk 32.

  As shown in FIG. 8, the inner disk 31 and the outer disk 32 of the damper 4 are made of a thin film of synthetic resin or metal (for example, steel), and the inner disk 31 and the outer disk 32 are multi-layered with four or more layers. May be arranged alternately. Thereby, the flow resistance of the magnetic fluid 20 and the drag received by each of the disks 31 and 32 are increased, and the vibration damping performance is improved. Further, when the disks 31 and 32 are flexible, when the disks 31 and 32 come into contact with each other or the disks 31 and 32 come into contact with the inner cylinder 23, the outer cylinder 24, or the elastic wall 28. The occurrence of damage and contact noise due to the contact is suppressed.

As shown in FIG. 9, magnets 51, 52; 56, 57 are composed of electromagnets instead of permanent magnets, and vehicle 1 (see FIG. 1) controls the energization amount to the electromagnets. May be provided. In this case, the energization control device 60 includes a touch sensor, a rotation amount detection unit that detects a rotation amount as a movement amount, and the like, and an opening state detection unit 61 as a holding state detection unit that detects the closed state of the door 3. (For example, a door switch) and a control unit 62 to which a detection signal from the opening state detection means 61 is input. The control unit 62 configured by a computer controls the amount of current supplied to the electromagnet according to the open state or the closed state of the door 3 (see FIG. 1) detected by the opening state detection means 61.
And when the opening degree detection means 61 detects an open state, the control part 62 stops energization to an electromagnet, and when the door 3 transfers from an open state to a closed state, the opening degree detection means 61 When a closed state is detected, the electromagnet is energized to generate a magnetic flux.
As described above, the magnets 51, 52; 56, 57 for magnetizing the magnetic fluid 20 (see FIG. 5) are electromagnets whose energization amount is controlled by the energization control device 60 in order to control the strength of the magnetic field with respect to the magnetic fluid 20. In addition, the energization control device 60 controls the energization amount so that the strength of the magnetic field with respect to the magnetic fluid 20 is larger than that in the open state when the door 3 is shifted from the open state to the closed state.
With this structure, the strength of the magnetic field with respect to the magnetic fluid 20 is changed according to the closed state and the open state of the door 3 by the electromagnet controlled by the energization control device 60, and the same effect as the above embodiment is achieved. The

Then, when the opening state detection means 61 detects the open state of the door 3, the energization of the electromagnet is stopped, and when the closed state is detected, the electromagnet is energized so that the electromagnet is magnetic in the open state. Since the magnetic fluid 20 is magnetized only in the closed state without magnetizing the fluid 20, the closing property of the door 3 is improved as compared with the case where the magnets 51, 52; 56, 57 are permanent magnets.
Moreover, the damper 4 and the electromagnet may be provided in the receiving part 14, and in that case, the damper 4 and the electromagnet are provided in the vehicle body 2, so that the door 3 is reduced in weight.
As another example, the electromagnet may be energized with an energization amount smaller than the energization amount in the closed state when the opening state detection means 61 detects the open state. By doing so, the impact at the start of contact between the damper 4 and the receiving portion 14 is reduced by the damper 4 in which the viscosity of the magnetic fluid 20 is slightly larger than when the electromagnet is not energized. The
Further, when the magnets 51, 52; 56, 57 are composed of electromagnets, the magnetic fluid 20 is detected when the vehicle speed or acceleration is detected by a vehicle speed sensor or an acceleration sensor provided on the door 3, and the vehicle speed or acceleration increases. The damping force of the damper 4 may be increased by controlling the energization amount of the electromagnet so that the strength of the magnetic field with respect to is increased. Thereby, the vibration of the door 3 that may occur when the vehicle speed or acceleration increases can be reduced.

Furthermore, another modified embodiment will be described below.
Magnets 51 and 52 made of permanent magnets or magnetism generators other than electromagnets are movable by being driven by an actuator, and when the door 3 is in an open state, it is separated from the liquid chamber 21 more than in a closed state. It may be moved by the actuator so as to be close to the liquid chamber 21 when it occupies a position and becomes closed. In this case, the magnets 51 and 52 or the magnetism generating member 5 having the magnetism generator and the damper 4 may be provided only on one of the door 3 and the vehicle body 2.
In addition to the magnets 51 and 52, the magnetic generator may be a member formed of a magnetic body that is magnetized by a magnet or the like.
The entire outer cylinder 24 may be formed of a non-magnetic material, and in that case, the leakage magnetic flux through the outer cylinder 24 is reduced.
The door provided in the automobile 1 may be a sliding door or a flip-up door (for example, a tailgate) in addition to the hinged door 3 described above. In this case, for example, the opening / closing direction or the axial direction in the vicinity of the closed state is the front-rear direction, and the axial orthogonal direction includes the up-down direction and the left-right direction. The opening / closing body may be a sunroof.
In the vehicle, the opening / closing body may be a cover of a hood or a storage box, and the supported body may be a member supported by the support body in addition to the opening / closing body.
The receiving part may be constituted by a part of a garnish as a surface forming member of the vehicle body.
The damper 4 may be provided on the vehicle body 2 as one member, and the receiving portion may be provided on the door 3 as the other member. In this case as well, the same operations and effects as in the above embodiment are exhibited.
The structure of the present invention may be provided in a vehicle other than a vehicle or a device other than a vehicle.

2 Car body 3 Side door 4 Damper 5 Magnetic generation member 14 Receiving part 20 Magnetic fluid 21 Liquid chamber 22 Case 23 Inner cylinder 24 Outer cylinder 28 Elastic wall 25 Main body 26, 27 End member 31, 32 Disks 51, 52, 56, 57 Magnet 53 Magnetic path forming member 60 Energization control device

Claims (10)

A support, a supported body that is held in a predetermined position by the support and a non-holding state before the holding state, and a damper that attenuates vibration of the supported body in the holding state In a structure comprising
The damper is a liquid seal damper that is provided on one member of the support and the support and includes a case that forms a liquid chamber in which a magnetic fluid is sealed.
The other member of the support and the support is provided with a magnetic generator that magnetizes the magnetic fluid,
In the holding state, the damper is pressed by the one member and the other member to such an extent that the shape of the liquid chamber changes compared to when the damper is not in contact with the other member. Abut against the other member,
The magnetic generator has a structure in which the strength of the magnetic field with respect to the magnetic fluid is increased when the supported body is shifted from the non-holding state to the holding state than in the non-holding state. body. The magnetic generator is a first magnetic generator and a second magnetic generator,
The first magnetic generator and the second magnetic generator are different from each other in the liquid chamber side magnetic pole in the first magnetic generator and the liquid chamber side magnetic pole in the second magnetic generator, and The magnetic flux between the magnetic pole of the first magnetic generator and the magnetic pole of the second magnetic generator is disposed so as to penetrate the liquid chamber when the support is in the holding state. The structure according to claim 1.   A magnetic path in which the magnetic pole of the first magnetic generator opposite to the liquid chamber and the magnetic pole of the second magnetic generator opposite to the liquid chamber are formed of a ferromagnetic metal. The structure according to claim 2, wherein the structures are connected by a forming member. The other member has a receiving portion with which the damper abuts when the supported body is in the holding state,
The receiving portion is provided on the outer surface side of a surface forming member that forms the outer surface of the other member,
The surface forming member is formed of a nonmagnetic material,
The structure according to any one of claims 1 to 3, wherein the magnetic generator is disposed on a back surface side of the surface forming member. The case connects the inner member and the outer cylinder with an inner member, an outer cylinder disposed so as to surround the inner member with the liquid chamber interposed therebetween, and sandwiches the liquid chamber. And a pair of connecting walls arranged in
The liquid chamber is formed in a cylindrical shape by the inner member, the outer cylinder, and the pair of connecting walls,
The structure according to claim 1, wherein the outer cylinder is in contact with the other member and is formed of a nonmagnetic material. The outer cylinder includes a cylindrical main body formed of a non-magnetic material, an axial end portion of the main body, and a pair of annular end portions formed of a ferromagnetic material to which the connecting wall is coupled. And having a member
The structure according to claim 5, wherein the end member is disposed to face the magnetic generator when the supported body is in the holding state. The case is provided with a resistor that protrudes into the liquid chamber and receives a drag force from the magnetic fluid by a relative movement with the magnetic fluid,
The structure according to claim 1, wherein the resistor is made of a non-magnetic material. The supported body has a peripheral edge;
The peripheral edge is supported by the support so as to be rotatable about a rotation center line, and the one edge in a direction orthogonal to the rotation center line among the peripheral edges. And the other edge opposite to each other,
The structure according to any one of claims 1 to 7, wherein the damper is disposed on the other edge. A support, a supported body that is held in a predetermined position by the support and a non-holding state before the holding state, and a damper that attenuates vibration of the supported body in the holding state In a structure comprising
The damper is a liquid seal damper provided in one member of the support and the supported body, and a magnetic fluid sealed in a liquid chamber,
The support or the support is provided with a magnetic generator that magnetizes the magnetic fluid,
In the holding state, the damper has the shape of the liquid chamber to the extent that the shape of the liquid chamber changes compared to when the damper is not in contact with the other member of the support and the supported body. In contact with the other member while being pressed by the other member,
The magnetic generator is an electromagnet whose energization amount is controlled by an energization control device to control the strength of the magnetic field in the liquid chamber,
The energization control device controls the energization amount so that the strength of the magnetic field with respect to the magnetic fluid is larger than that in the non-holding state when the supported body shifts from the non-holding state to the holding state. A structure characterized by that.   The structure according to claim 9, wherein the damper and the electromagnet are provided on the supported body.

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