JP2010253422A - Actuator unit and vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily position an actuator and a housing member of the actuator. <P>SOLUTION: A positioning member 70 is fixed to a yoke part 62 by attaching a bottom part 73 to the upper surface of the yoke part 62 and inserting pins 76 and 77 to a fixing hole 73H perforated at the bottom part 73. The outer diameter of a cylindrical part 71 is almost the same as the inner diameter of a bracket 82 and it is forcibly fitted to the bracket 82. By the forcible fitting, a stator 60 is fixed to the bracket 82 while being positioned with the bracket 82 through the positioning member 70. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is an actuator unit having an actuator used as a vibration means, and is used as an engine mount in general industrial machines and automobiles, and transmits vibration transmitted from a vibration generating part such as an engine to a vibration receiving part such as a vehicle body. The present invention relates to a vibration isolator that absorbs and attenuates.

  An anti-vibration device as an engine mount is disposed between the engine that is the vibration generation unit of the vehicle and the vehicle body that is the vibration receiving unit, and this anti-vibration device absorbs the vibration generated by the engine, Suppresses vibration transmission to As such a vibration isolator, an active control engine mount that is an active vibration isolator has been developed. For example, Patent Documents 1 and 2 disclose a liquid-sealed engine mount including a main liquid chamber that expands and contracts according to deformation of a rubber elastic body, and a sub liquid chamber that is connected to the main liquid chamber by a restriction passage (orifice). Is disclosed, and the movable plate facing the main liquid chamber is vibrated using a linear actuator.

  By the way, when using a linear actuator as a vibration means, it is necessary to perform positioning with respect to a movable plate as a vibration target and to fix the linear actuator to the vehicle body side. Usually, the linear actuator is used by being housed in a housing member in order to ensure dustproof and waterproof properties. The housing member is fixed to the vehicle body and the vibration isolator, and the linear actuator is fixed while being positioned on the housing member. For example, in Patent Document 1, it is fixed to the bracket by a bolt member extending downward from the yoke. However, when fixing by fastening with screws, positioning is difficult.

JP 2007-55915 A

  The present invention has been made in consideration of the above-described facts, and provides an actuator unit capable of easily positioning an actuator and a housing member of the actuator, and a vibration isolator equipped with the actuator unit. The purpose is to provide.

  In order to achieve the above object, an actuator unit according to claim 1 includes a shaft member, and an overhanging portion that is fixed to an axially intermediate portion of the shaft member and projects radially outward of the shaft member, A mover capable of reciprocating in the axial direction, and a yoke portion made of a magnetic material, an excitation coil, and the overhanging portion are disposed in a radial direction so as to surround the outer periphery of the mover. A stator configured to include a pair of permanent magnets opposed to each other, a housing member that houses the mover and the stator in a housing space that is configured inside, and the housing that is fixed to the stator and the housing A positioning member that is press-fitted into the space and is fixed to the housing member while being positioned with respect to the housing member.

  In the actuator unit of the present invention, the movable element that reciprocates in the axial direction has a protruding portion that protrudes radially outward of the shaft member. The overhanging portion is fixed to an intermediate portion of the shaft member, and reciprocates in the axial direction together with the mover. The mover and the stator are accommodated in an accommodation space configured inside the accommodation member. A positioning member is fixed to the stator. The positioning member is press-fitted into the housing space of the housing member and fixed while being positioned with respect to the housing member.

  According to the present invention, the stator is fixed to the housing member while being positioned by the press-fitting of the positioning member, so that the housing member can be easily positioned and fixed without using a screw.

  The actuator unit according to claim 2 has a cylindrical portion in which the housing member is cylindrical, and the positioning member is press-fitted into a hollow inside the cylinder of the housing member and is positioned in the radial direction with respect to the housing member. Features.

  Thus, the positioning member can be press-fitted and fixed in the in-cylinder hollow by forming the accommodating member in a cylindrical shape and using the in-cylinder hollow as the accommodating space.

  The actuator unit according to claim 3 is a flange in which the positioning member extends radially outward from the rear end of the press-fitting and abuts against an end of the housing member to position the housing member in the cylinder axis direction. Having a part

  Thus, by providing the flange portion on the positioning member, the housing member can be easily positioned in the cylinder axis direction.

  The vibration isolator according to claim 4 includes a first mounting member connected to one of the vibration generating unit and the vibration receiving unit, a second mounting member connected to the other of the vibration generating unit and the vibration receiving unit, An elastic body that connects the first mounting member and the second mounting member and deforms by vibration input from a vibration generating portion, and a main liquid chamber that encloses liquid and expands and contracts by deformation of the elastic body. A movable plate configured between the elastic body and the movable plate is disposed on the opposite side of the main liquid chamber with the movable plate interposed therebetween, and the accommodating member is fixed to one of a vibration generating unit and a vibration receiving unit, The actuator unit according to claim 1, wherein a shaft member of a mover is coupled to the movable plate to vibrate the movable plate.

  In the vibration isolator of the present invention, the stator is fixed to the housing member while being positioned on the housing member by press-fitting the positioning member. Therefore, it is possible to easily position and fix the housing member without using screws.

  According to a fifth aspect of the present invention, there is provided a vibration isolating apparatus comprising: a sub liquid chamber that is at least partially configured by a diaphragm and that expands and contracts according to a change in liquid pressure; and a restriction passage that communicates the main liquid chamber and the sub liquid chamber. I have.

  As described above, by providing the auxiliary liquid chamber and the restriction passage, the liquid is circulated between the main liquid chamber and the auxiliary liquid chamber, and the vibration damping effect is effectively achieved by the liquid column resonance in the restriction passage. In addition, an anti-vibration effect can be obtained.

  The vibration isolator according to claim 6 is characterized in that the sub liquid chamber is formed on the opposite side of the main liquid chamber with the elastic body interposed therebetween, and a part of the partition wall is formed of the elastic body. And

  As described above, by providing the sub liquid chamber on the opposite side of the main liquid chamber with the elastic body interposed therebetween, a part of the elastic body can be used as a partition wall of the sub liquid chamber.

  As described above, according to the actuator unit of the present invention, the stator can be easily positioned and fixed to the housing member without using a screw.

It is a sectional side view which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is the sectional side view rotated 90 degree | times from FIG. 1 which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is a disassembled perspective view which shows the structure of the actuator unit which concerns on embodiment of this invention. It is a sectional side view which shows the structure of the actuator unit which concerns on embodiment of this invention. It is the sectional side view rotated 90 degree | times from FIG. 4 which shows the structure of the actuator unit which concerns on embodiment of this invention. It is a disassembled perspective view which shows the structure of the actuator which concerns on the modification of embodiment of this invention. It is a sectional side view which shows the structure of the actuator which concerns on the modification of embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an actuator and a vibration isolator according to the present invention will be described with reference to the drawings.

  1 and 2 show a vibration isolator 10 according to an embodiment of the present invention. The vibration isolator 10 is applied as an engine mount that supports an engine that is a vibration generating unit in an automobile to a vehicle body that is a vibration receiving unit. In addition, the code | symbol S in a figure shows the axial center of an apparatus, and demonstrates the following description by making the direction along this axial center into the axial direction S of an apparatus.

  As shown in FIG. 1, the vibration isolator 10 includes a first attachment member 12 attached to the engine side, a second attachment member 20 attached to the vehicle body side via a leg member 96 described later, A rubber elastic body 16 that connects the second mounting member 20 is provided.

  The second mounting member 20 includes an outer cylinder 22 and an intermediate cylinder 24. The outer cylinder 22 includes a cylindrical portion 22A having a substantially cylindrical shape, a flange portion 22B extending radially outward from one end of the cylindrical portion 22A, an end portion of the intermediate cylinder 24 on the other end side of the cylindrical portion 22A, and will be described later. A caulking portion 22C for caulking and fixing the sealing plate 40 or the like is provided. The intermediate cylinder 24 has a substantially cylindrical shape having a smaller diameter than the cylindrical portion 22 </ b> A, and is coaxially disposed on the radially inner side of the outer cylinder 22. One end side of the intermediate cylinder 24 is a curved portion 24A that is slightly curved radially outward, and the other end side is a stepped flange portion 24B that is bent radially outward. A bolt hole 22 </ b> H for connection with the rebound stopper fitting 13 is drilled in the flange portion 22 </ b> B of the outer cylinder 22.

  As shown in FIG. 1, a rebound stopper metal fitting 13 is disposed on the upper outer side of the vibration isolator 10. The rebound stopper fitting 13 has a rubber material 13A bonded to the inside of a top portion that is curved in a substantially U shape, and is fixed to the second attachment member 20 by a bolt 13C and a nut 13D at the attachment portion 13B. In addition, about the rebound stopper metal fitting 13, illustration is abbreviate | omitted in drawings other than FIG.

  The second mounting member 20 is connected to a vehicle body (not shown) via a leg member 96 described later.

  The first mounting member 12 has a substantially cylindrical shape whose outer diameter is smaller than the inner diameter of the second mounting member 20, is coaxial with the second mounting member 20, and is axially S more than the second mounting member 20. It is arranged to protrude outward. The 2 mounting member 20 side of the 1st mounting member 12 is made into the substantially taper shape which becomes a small diameter toward a front-end | tip. The side opposite to the second mounting member 20 of the first mounting member 12 is disposed opposite to the rubber material 13 </ b> A of the rebound stopper fitting 13. The first attachment member 12 is connected to an engine (not shown) by an attachment portion (not shown).

  The rubber elastic body 16 is vulcanized and bonded to the outer periphery of the small diameter end of the first mounting member 12 and vulcanized and bonded so as to cover the outer peripheral side of the curved portion 24A on the inner periphery of the intermediate tube 24 on the curved portion 24A side. The first mounting member 12 and the intermediate cylinder 24 are elastically connected. A concave portion 16 </ b> A is formed on the lower surface of the rubber elastic body 16 (the surface on the second attachment member 20 side). A thin upper film 17 that covers the outer peripheral surface of the first mounting member 12 is integrally formed with the rubber elastic body 16. The rubber elastic body 16 is integrally formed with a thin lower film 18 that extends toward the stepped flange portion 24 </ b> B of the intermediate cylinder 24 and covers the inner peripheral surface of the intermediate cylinder 24.

  A diaphragm 30 is vulcanized and bonded to the inside of the cylindrical portion 22 </ b> A of the outer cylinder 22. The diaphragm 30 is made of a thin rubber film and has a substantially cylindrical shape. One end of the cylinder of the diaphragm 30 is bent inward in the radial direction and reduced in diameter, and is vulcanized and bonded to the ring 34. The ring 34 is externally fitted to the first attachment member 12 via the upper film 17. The other end of the cylinder of the diaphragm 30 constitutes a coating film 32 that extends toward the caulking portion 22C of the outer cylinder 22 and covers the inner peripheral surface of the cylindrical portion 22A.

  A sealing plate 40 is disposed on the opposite side of the second mounting member 20 from the first mounting member 12. A main liquid chamber 36 is constituted by being surrounded by the concave portion 16 </ b> A of the rubber elastic body 16, the intermediate cylinder 24, and the sealing plate 40. Between the rubber elastic body 16 and the diaphragm 30, an auxiliary liquid chamber 38 is formed in an annular shape. An orifice passage 26 is formed between the outer cylinder 22 and the intermediate cylinder 24. One end of the orifice passage 26 communicates with the main liquid chamber 36 and the other end communicates with the sub liquid chamber 38, and the main liquid chamber 36 and the sub liquid chamber 38 communicate with each other through the orifice passage 26. The main liquid chamber 36, the sub liquid chamber 38, and the orifice passage 26 are filled with liquid.

  When vibration in the axial direction S is input from the side of the first mounting member 12 connected to the engine, the rubber elastic body 16 is elastically deformed, and the internal volume of the main liquid chamber 36 is expanded and contracted with this elastic deformation. As a result, vibrations in a relatively low frequency range among vibrations input from the engine, such as shake vibrations, are input into the main liquid chamber 36 due to a pressure difference between the main liquid chamber 36 and the sub liquid chamber 38. The liquid and the liquid sealed in the sub liquid chamber 38 circulate through the orifice passage 26, and a vibration damping effect and a vibration isolation effect can be obtained by a liquid column resonance action or the like in the orifice passage 26. The orifice passage 26 is set so that its path length and cross-sectional area can effectively exhibit a damping effect in a frequency range of low-frequency large-amplitude vibration such as engine shake.

  The sealing plate 40 has a disc shape, and includes an outer peripheral plate portion 42, a movable plate 44, and an annular rubber portion 46 that connects the outer peripheral plate portion 42 and the movable plate 44. The outer peripheral plate portion 42 is bent at the outer peripheral end downward, and is caulked together with the stepped flange portion 24 </ b> B of the intermediate cylinder 24 and fixed to the second mounting member 20. The movable plate 44 is configured with a connecting recess 44A for inserting and connecting a shaft member 54 of an actuator 50 described later. The movable plate 44 is elastically supported by the outer peripheral plate portion 42 by the rubber portion 46.

  An actuator 50 is disposed on the side of the sealing plate 40 opposite to the main liquid chamber 36. As shown in FIGS. 3 to 5, the actuator 50 includes a mover 52 that reciprocates in the axial direction S, and a stator 60 that supports the mover 52. The actuator 50 according to the present embodiment operates on the same principle as the linear actuator disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-343964.

  The mover 52 includes a shaft-shaped shaft member 54 and disk-shaped projecting portions 56 and 58. The shaft member 54 is disposed along the axial direction S, and one end portion 54 </ b> A is coupled to the coupling recess 44 </ b> A of the movable plate 44. The overhang portions 56 and 58 are fixed to an intermediate portion of the shaft member 54 so as to be coaxial with the shaft member 54 and spaced apart from each other. The overhang portions 56 and 58 are configured by laminating a plurality of metal plates that are magnetic metals such as electromagnetic steel plates.

  The stator 60 is disposed so as to surround the outer periphery of the mover 52 and includes a yoke part 62, a coil part 64, and a magnetic pole part 67.

  The yoke portion 62 is annular, and a hollow portion 62A is configured. The mover 52 is inserted through the center of the hollow portion 62A. The yoke portion 62 is configured by laminating a plurality of annular metal plates made of a magnetic metal such as an electromagnetic steel plate. The yoke portion 62 is formed with convex portions 63A and 63B that protrude radially inward from positions facing each other. The tips (inner ends) of the convex portions 63A and 63B are formed in an arc shape along the protruding portions 56 and 58, and a permanent magnet is fixed to form a magnetic pole portion 67.

  As shown in FIGS. 3 and 5, two sets of permanent magnets 65 </ b> A and 65 </ b> B arranged in the axial direction S are fixed at positions facing the protruding portions 56 of the convex portions 63 </ b> A and 63 </ b> B. The two sets of permanent magnets 65A and 65B are arranged so that the magnetic poles are NS different from each other. In addition, two sets of permanent magnets 66A and 66B arranged in the axial direction S are fixed to the lower side (the side far from the sealing plate 40) of the two sets of permanent magnets 65A and 65B of the convex portions 63A and 63B. . The two sets of permanent magnets 66A and 66B are arranged such that the magnetic poles have NS alternating different polarities, and the adjacent permanent magnets 65B and 66A have magnetic poles having NS alternating different polarities. Yes. That is, in the magnetic pole portion 67, four sets of permanent magnets 65A, 65B, 66A, and 66B are arranged in the axial direction S so that the magnetic poles are NS different from each other.

  Note that the length from the upper end of the permanent magnet 65A to the lower end of the permanent magnet 65B is longer than the length of the protruding portion 56 in the vertical direction (axial direction S). The length from the upper end of the permanent magnet 66A to the lower end of the permanent magnet 66B is also longer than the length of the overhanging portion 58 in the vertical direction (axial direction S).

  A positioning member 70 is fixed to the upper end (on the sealing plate 40 side) of the yoke portion 62 in the axial direction S. The positioning member 70 includes a cylindrical cylindrical portion 71, a flange portion 72 extending radially outward on one end side of the cylindrical portion 71, and a bottom portion 73 constituting a bottom surface on the other end side of the cylindrical portion 71, These are integrally formed. The bottom 73 has a disc shape, and a quadrangular opening 73A is formed at the center.

  The positioning member 70 is fixed to the yoke portion 62 with the bottom portion 73 being in close contact with the upper surface of the yoke portion 62, and pins 76 and 77 being inserted into a stop hole 73 </ b> H drilled in the bottom portion 73. The outer diameter of the cylindrical portion 71 is substantially the same as the inner diameter of a bracket 82 described later, and is press-fitted into the bracket 82. By this press-fitting, the stator 60 is fixed to the bracket 82 while being positioned with respect to the bracket 82 via the positioning member 70.

  The mover 52 is elastically supported by a pair of upper and lower leaf springs 90, 90 so as to reciprocate in the axial direction S with respect to the stator 60. The leaf springs 90, 90 include a central ring portion 93 and a pair of outer peripheral annular portions 94, 94. The central ring portion 93 is engaged with and supported by a support groove 54 </ b> M formed in the shaft member 54. The pair of outer peripheral annular portions 94, 94 is formed in a rectangular deformed ring shape that extends from the central ring portion 93 and bypasses a coil member 64 described later. The upper peripheral annular portion 94 is attached to the groove 77M of the pin 77 so as to be spaced apart from the positioning member 70 in the axial direction S by a predetermined distance. The lower outer peripheral annular portion 94 is attached to the pin 77 so as to be separated from the lower surface of the yoke portion 62 by a predetermined distance in the axial direction S.

  A coil member 64 is disposed in the hollow portion 62 </ b> A of the yoke portion 62. The coil member 64 has a pair of coil portions 78A and 78B in which a coil is wound around each of the convex portions 63A and 63B of the yoke portion 62. The pair of coil portions 78A and 78B are connected by a connecting portion 79. Therefore, the coil portions 78A and 78B are configured to be able to generate a magnetic flux in the direction in which the four sets of permanent magnets 65A, 65B, 66A, and 66B face each other. A connector 80 is formed in the coil portion 78 </ b> A, and the coil is energized through the connector 80.

  The actuator 50 is accommodated in the bracket 82. The bracket 82 has a bottomed cylindrical shape, and has a cylindrical cylindrical portion 84, a bottom portion 86 that closes one end side of the cylindrical portion 84, and a flange that extends radially outward at an opening on the other end side of the cylindrical portion 84. A portion 88 is provided. The accommodation space R is configured by a hollow in the cylindrical portion 84. The positioning member 70 is press-fitted from the bottom 73 side to the flange portion 88 side of the housing space R in the bracket 82, and the stator 60 is positioned in the radial direction between the stator 82 and the bracket 82 through this positioning member 70. Has been made. Further, the flange portion 72 of the positioning member 70 is disposed on the flange portion 88 of the bracket 82. A stopper rubber 92 is provided at a position corresponding to the shaft member 54 of the bottom portion 86. When the flange portion 72 is brought into contact with the flange portion 88, the stator 60 is positioned with respect to the bracket 82 via the positioning member 70 in the axial direction S.

  In the actuator 50, when an alternating current is applied to the coil portions 78 </ b> A and 78 </ b> B, the magnetic force of the coil portions 78 </ b> A and 78 </ b> B and the magnetic force of the magnetic pole portion 67 interact to alternately apply a vertical force to the mover 52. Make it work. As a result, the mover 52 supported by the leaf spring 90 reciprocates in the axial direction S.

  The bracket 82 is accommodated in the leg member 96. The leg member 96 includes a cylindrical cylindrical portion 96A, a tapered leg portion 96B having a large diameter from the lower end to the lower side of the cylindrical portion 96A, and a flange extending radially outward from the upper end of the cylindrical portion 96A. A portion 96C is provided. The flange portion 88 is arranged on the flange portion 96C, and the flange portion 72, the outer peripheral plate portion 42, and the stepped flange portion 24B are sequentially stacked on the flange portion 96C, and these are sandwiched between the caulking portions 22C and fixed by caulking. . The leg member 96 is connected to the vehicle body side by a bolt (not shown) on the opposite side of the leg portion 96B from the cylindrical portion 96A.

  In the vibration isolator 10 having the above-described configuration, the actuator 50 is reciprocated according to the vibration from the vibration generating unit (engine), and the movable plate 44 is vibrated to absorb the vibration from the vibration generating unit and receive the vibration. Vibration transmission to the part (vehicle body) side is suppressed.

  In the present embodiment, the positioning member 70 is press-fitted into the accommodation space R in the bracket 82 so that the stator 60 fixed to the positioning member 70 is positioned and fixed with respect to the bracket 82. Therefore, screws are used. And positioning and fixing can be performed easily and accurately.

  In the present embodiment, the cylindrical portion 71 of the positioning member 70 is cylindrical and the flange portion 72 is ring-shaped. However, these do not necessarily have to be configured over the entire circumference in the circumferential direction. For example, as shown in FIG. 6, with respect to the cylindrical portion 71, the press-in portions 91, 91 are configured by partially forming notches in the circumferential direction so that press-fitting into the accommodation space R is possible. It is good also as the positioning member 70-2 which performs positioning of the axial direction S with the flange parts 91F and 91F extended from the edge part of 91 to the radial direction outer side.

  Further, in the present embodiment, the positioning member 70 is fixed to the upper surface of the yoke portion 62 and the cylindrical portion 71 is press-fitted into the accommodation space R for positioning and fixing. However, as shown in FIG. The positioning member 98 may be fixed to the upper surface, and the bracket 82 may be positioned and fixed. The positioning member 98 in this case can be configured by a cylindrical portion 98A having substantially the same diameter as the inner diameter of the bracket 82, and a bottom portion 98B bent radially inward from the end of the cylindrical portion 98A. Positioning in the axial direction S is performed by one end portion of the cylindrical portion 98 </ b> A coming into contact with the upper surface of the bottom portion 86 of the bracket 82 (surface constituting the accommodation space R).

10 vibration isolator 12 first mounting member 16 rubber elastic body 20 second mounting member 22 outer cylinder 24 intermediate cylinder 26 orifice passage 30 diaphragm 36 main liquid chamber 38 sub liquid chamber 40 sealing plate 44 movable plate 46 rubber portion 50 actuator 52 Movable element 54 Shaft member 56 Overhang part 58 Overhang part 60 Stator 62 Yoke part 64 Coil member 67 Magnetic pole part 70 Positioning member 78A Coil part 78B Coil part 82 Bracket 90 Plate spring S Axial direction

Claims (6)

A movable member having a shaft member and a projecting portion fixed to an axially intermediate portion of the shaft member and projecting radially outward of the shaft member; and capable of reciprocating in the axial direction;
The yoke is arranged so as to surround the outer periphery of the mover, and includes a yoke part made of a magnetic material, an exciting coil, and a pair of permanent magnets arranged to face each other with the projecting part sandwiched in the radial direction. A stator,
An accommodating member for accommodating the mover and the stator in an accommodating space configured therein;
A positioning member fixed to the housing member while being fixed to the stator and press-fitted into the housing space and being positioned between the housing member;
Actuator unit with   The said accommodating member is made into a cylinder shape, The said positioning member has a cylinder part which press-fits in the cylinder hollow of the said accommodating member, and positions with the said accommodating member to radial direction, The Claim 1 characterized by the above-mentioned. Actuator unit. The positioning member has a flange portion that extends radially outward from the rear end of the press-fitting and abuts against an end portion of the housing member to position the housing member in the cylinder axis direction. The actuator unit according to claim 2. A first attachment member coupled to one of the vibration generator and the vibration receiver;
A second attachment member coupled to the other of the vibration generating portion and the vibration receiving portion;
An elastic body that connects the first mounting member and the second mounting member and deforms by vibration input from a vibration generating unit;
A movable plate that encloses between the elastic body and a main liquid chamber that encloses liquid and expands and contracts by deformation of the elastic body;
The movable member is disposed on the opposite side of the main liquid chamber with the movable plate interposed therebetween, and the accommodating member is fixed to one of the vibration generating unit and the vibration receiving unit, and the shaft member of the movable element is connected to the movable plate. The actuator unit according to any one of claims 1 to 3, wherein the movable plate is vibrated.
Anti-vibration device with A sub-liquid chamber that is at least partially constituted by a diaphragm and expands and contracts in response to a change in hydraulic pressure; and
A restriction passage communicating the main liquid chamber and the sub liquid chamber;
The vibration isolator according to claim 4 provided with.   6. The vibration isolation device according to claim 5, wherein the sub liquid chamber is configured on the opposite side of the main liquid chamber with the elastic body interposed therebetween, and a part of the partition wall is configured by the elastic body. apparatus.

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