JP5272501B2 - Damper and vehicle seat equipped with the damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper capable of softly absorbing the impact when the impact is small, and becoming hard to securely hold an impact absorbed body such as the head when the impact is large. <P>SOLUTION: The damper 1 includes a container 2; a dividing member 6 rotatable together with the container 2 and movable relative to the container 2 to divide the space within the container 2 into storage compartments 4 and 5; moving force applying means 7 for applying the moving force to the dividing member 6 by the input rotation to move at the speed according to the rotational speed of the input rotation; resilient means 8 for resiliently urging the dividing member 6; a through-hole 9 formed in the dividing member 6 so that the storage compartments 4 and 5 communicate with each other; and flow control means 10 for limiting the flow of a viscous fluid 3 in the storage compartment 4 into the storage compartment 5 via the through-hole 9 when the internal pressure larger than a prescribed value of the viscous fluid 3 stored in the storage compartment 4 is generated based on the movement of the dividing member 6. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a damper for buffering an impact, and in particular, when a rear impact is received in a vehicle, the seat occupant moves forward to support the seat occupant's head when subjected to inertia. The present invention relates to a damper suitable for a vehicle seat having a headrest and a vehicle seat including such a damper.

Japanese Patent Laid-Open No. 10-181403 JP-A-10-119619 JP-A-11-268565 JP 2003-81044 A JP 2003-176844 A JP 2005-225334 A Japanese Patent Laid-Open No. 2006-82772 JP 2006-88875 A

  In a vehicle, a vehicle seat has been proposed in which a headrest is moved forward in order to restrain a seated person's head when a rear-end collision occurs.

  By the way, the damper used to reduce the impact used for such a vehicle seat is designed to cushion the impact caused by the rear-end collision softly so as to support the head in the rear-end collision at low speed so that the impact is not applied. Therefore, it is required to buffer the impact with a hardness corresponding to the magnitude of the impact at the time of the rear-end collision so that the head is hardened to support the head reliably and the impact due to the rear-end collision is buffered.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to absorb an impact softly when the impact is small, and to become hard when the impact is large, for example, an impact-absorbed body. An object of the present invention is to provide a damper that can securely hold the head.

  Another object of the present invention is that the headrest can be reliably moved forward only when a rear-end collision is made by accurately discriminating when the rear-end collision or the like is not and the backrest. An object of the present invention is to provide a vehicle seat that can be installed compactly.

  The damper of the present invention divides a container and the container into two storage chambers that store viscous fluid in the axial direction of the container and rotates with the container in a direction around the axis of the container, while the axis of the container A partition member movable in the center direction with respect to the container, and a rotational force in one direction relative to the container in a direction around the axis of the container, and a moving force in one direction in the axis direction on the partition member A moving force applying means that gives a moving speed according to the rotation speed of the rotation input, an elastic means that elastically biases the partition member in the other axial direction with respect to the container, At least one communication hole formed in the partition member so as to communicate with each other, and the storage chamber in one direction in the axial direction based on the movement of the partition member in one direction in the axial direction Of viscous fluid contained in A flow restricting means for restricting the flow of the viscous fluid in one direction of the accommodating chamber in the axial direction through the communication hole to the accommodating chamber in the other direction of the axial direction in the generation of the internal pressure exceeding the fixed value. The flow restricting means has a through hole that opens in the accommodation chamber in one direction in the axial direction at the end surface in one direction in the axial direction, and cooperates with the end surface in one direction of the partition member On the one hand, it communicates with the through-hole, and on the other hand, it faces the end face in one direction in the axial direction of the partition member at the end face in the other axial direction so as to form a variable cross-sectional passage communicating with the communicating hole. The variable passage forming member mounted on the partition member movably in the axial direction, and the end surface in the other axial direction of the variable passage forming member and the end surface in one direction in the axial direction of the partition member. With a plastic spring To have.

  According to such a damper, in the case of a low-speed rotation input that does not exceed a certain value, the partition member is moved in one direction in the axial direction at a low speed that does not exceed the certain value, and in the axial direction of the container. Since the internal pressure of the viscous fluid stored in the storage chamber in one direction does not exceed a certain value, the end surface in the other direction in the axial direction of the variable passage forming member and the end surface in one direction in the axial direction of the partition member A large cross-sectional area of the variable cross-section passage is maintained without the plastic spring disposed between the two being greatly contracted, and thus the viscous fluid stored in the storage chamber in one direction in the axial direction is not much. As a result of the fluid flowing into the accommodation chamber in the other direction through the through-hole, variable cross-section passage and communication hole without resistance, the damping force generated, in other words, the reaction force against the rotational input, Variable passage and communication In the case of high-speed rotational input exceeding a certain value, the partition member tends to move in one direction in the axial direction at a high speed exceeding a certain value. Since the internal pressure of the viscous fluid stored in the storage chamber in one direction in the axial direction of the container exceeds a certain value, the end surface in the other axial direction of the variable passage forming member and the axial center of the partition member The plastic spring disposed between the end face in one direction in the direction is greatly shrunk so that the end face in the other direction in the axial direction of the variable passage forming member and the end face in one direction in the axial direction of the partition member are The distance in the axial direction between them becomes smaller and the cross-sectional area of the variable cross-sectional passage becomes smaller, so that the through hole and the cross-section of the viscous fluid accommodated in the accommodating chamber in one direction in the axial direction of the container Variable passage and communication The flow through the hole to the container in the other direction in the axial direction of the container is performed with a large resistance. As a result, the resulting damping force, in other words, the reaction force against the rotational input, is in one direction in the axial direction. The size is based on the compression resistance of the viscous fluid in the containment chamber and the flow resistance of the viscous fluid through the variable cross-section passage with a reduced passage cross-sectional area, and thus a low speed that does not exceed a certain value when the impact is small In the case of this rotational input, the impact is softly absorbed, and in the case of a rotational input at a high speed exceeding a certain value, which is a case where the impact is large, it becomes hard and can securely hold the absorbed body.

  In a preferred example, the moving force applying means includes a rotatable member that is rotatably disposed in the container in a direction around the axis of the container, an end surface in one direction in the axial direction of the rotatable member, and the one And an inclined surface means having an inclined surface inclined with respect to the axial direction and formed between the end surfaces in the other axial direction of the partition member facing the end surface in the direction of In such a moving force applying means, the inclined surface means is formed integrally with the end face in one direction of the rotatable member so as to protrude in one direction in the axial direction and is arranged in the direction around the axial center. A plurality of rotatable member protrusions and a direction around the axis so as to be integrally formed on the end surface of the partition member in the other direction and projecting in the other axial direction and engaging the rotatable member protrusion A plurality of partition member protrusions arranged in It may also be Bei, in the case of such inclined surface means, the inclined surface is formed on the people each rotatable member projections and the partitioning member projections so as to be brought into sliding contact with each other.

  One communication hole may be provided, but instead, a plurality of communication holes may be formed in the partition member. In this case, the variable passage forming member includes a plate-like portion having a through-hole and the plate. A leg portion formed integrally with each of the plurality of communication holes and integrally formed at an end portion of the leg portion protruding from the communication hole and from the communication hole of the leg portion. It is good to have a collar part which prevents slipping out.

  In a preferred example, the partition member has a frustoconical surface on one end face in the axial direction, and the variable passage forming member is complementary to the frustoconical surface of the partition member and A frustoconical surface facing the conical surface, and the variable cross-sectional passage has a frustoconical passage formed by the frustoconical surface of the partition member and the frustoconical surface of the variable passage forming member. In such an example, the frustoconical surface of the partition member is one of the frustoconical concave surface and the frustoconical convex surface, and the frustoconical surface of the variable passage forming member is the frustoconical concave surface and the corrugated surface. The other of the convex surfaces of the head cone may be provided.

  In a preferred example, the plastic spring is a nylon resin, a polyacetal resin such as a polyoxymethylene resin, a polyether ether ketone resin, or a polycarbonate whose elastic modulus decreases (softens) at a high temperature but increases (hardens) at a low temperature. A spring made of a synthetic resin such as a resin, preferably a spiral spring, such a spring made of a synthetic resin is greatly elastically shrunk at a high temperature, while being small and elastically shrunk at a low temperature, resulting in increased fluidity at a high temperature. On the other hand, a variable cross-section passage having a passage cross-sectional area determined by the elastic contraction of the plastic spring is obtained by a synergistic action with a viscous fluid having a positive temperature characteristic with respect to the fluidity in which the fluidity decreases at low temperatures. Can reduce the temperature dependence of the flow resistance of a flowing viscous fluid, for example, when the impact is high at high temperatures Reduces the difference between the hardness in the axial direction of the damper for high-speed rotation input exceeding a certain value and the hardness in the axial direction of the damper for high-speed rotation input exceeding a certain value when there is a large impact at low temperatures. In addition, the absorbent body can be reliably held with a hardness that is not so different at high and low temperatures in the axial direction.

  The viscous fluid used in the present invention is preferably 100 to 1000 cst silicone oil, but is not limited thereto.

  A vehicle seat according to the present invention includes a backrest of a vehicle, a headrest supported by the backrest so as to be movable forward of the vehicle, moving urging means for urging and moving the headrest forward, and forward of the headrest. A prohibiting mechanism for prohibiting the movement of the headrest, and a releasing means for canceling the prohibition of the headrest forward movement by the prohibiting mechanism at a moving speed exceeding a certain value to the rear of the vehicle that is added to the backrest. The load-rotation conversion mechanism that converts the load applied to the backrest of the backrest into a rotational force, and the transmission mechanism that transmits the force applied to the backrest based on the moving speed exceeding a certain value to the rear of the vehicle to the prohibition mechanism The transmission mechanism has the damper according to any one of the above aspects, and one of the damper container and the moving force applying means rotates the rotational force from the load-rotation conversion mechanism. As input It is connected to the load-rotation conversion mechanism as much as possible, and the other of the damper container and the moving force applying means transmits the force based on the moving speed exceeding a certain value to the rear of the vehicle applied to the backrest to the prohibiting mechanism. Therefore, it is connected to the prohibition mechanism.

  According to the vehicle seat of the present invention, the release means for releasing the prohibition of forward movement of the headrest by the prohibiting mechanism at a speed exceeding the predetermined value to the back of the vehicle applied to the backrest is applied to the back of the vehicle applied to the backrest. It has a transmission mechanism that transmits a force based on a speed exceeding a certain value to the prohibition mechanism, and the transmission mechanism has a damper of any of the above modes, so that it is not so when a rear-end collision occurs. The headrest can be surely moved forward only when the time is accurately identified and rear-end collision is performed, and moreover, the headrest can be installed compactly in the backrest or the like.

  In the vehicle seat of the present invention, the load-rotation conversion mechanism may include a load receiving plate that is rotatably supported by the backrest frame and is disposed in the backrest portion of the backrest. .

  The headrest is supported so as to be pivotable or linearly movable forward on the backrest, and the moving urging means is configured to rotate or linearly urge the headrest forward. Forward rotation or linear movement may be prohibited.

  According to the present invention, it is possible to provide a damper that softly absorbs an impact when the impact is small and becomes hard when the impact is large and can securely hold the shock absorber, for example, the head. Also, for vehicles that can accurately move the headrest forward only when the rear-end collision and so on are accurately identified and rear-end collision, and can be installed compactly in the backrest, etc. Sheets can be provided.

  Next, the present invention and its embodiments will be described in more detail based on preferred embodiments shown in the drawings. In addition, this invention is not limited to these Examples at all.

  1 to 5, the damper 1 of this example includes a container 2, two storage chambers 4 that store the viscous fluid 3 in the space A in the container 2 in the directions A <b> 1 and A <b> 2. 5, and rotates together with the container 2 in the directions R1 and R2 that are directions around the axis O of the container 2, while being movable with respect to the container 2 in the directions A1 and A2 that are the axes of the container 2. By the rotational input in the R2 direction, which is one of the R1 and R2 directions relative to the member 6 and the container 2, the partition member 6 is given a moving force in the A1 direction which is one of the A1 and A2 directions. A moving force applying means 7 for giving a moving speed according to the rotation speed of the rotation input; an elastic means 8 for elastically urging the partition member 6 in the A2 direction which is the other direction in the A1 and A2 directions; Two containers in container 2 Two communicating holes 9 formed in the partition member 6 so as to communicate the chambers 4 and 5 with each other, and the viscous fluid 3 stored in the storage chamber 4 in the A1 direction based on the movement of the partition member 6 in the A1 direction. When an internal pressure exceeding a certain value is generated, there is provided a flow restricting means 10 for restricting the flow of the viscous fluid 3 in the accommodating chamber 4 in the A1 direction to the accommodating chamber 5 in the A2 direction via the communication hole 9.

  The container 2 has a cylindrical portion 23 integrally having an inner diameter side flange 21 at one end in the A2 direction and an outer diameter side flange 22 at one end in the A1 direction, and an outer diameter side flange 22 of the cylindrical portion 23. Alternatively, a plurality of protrusions which are fixed by screws 24 and protrude in the A2 direction on the end face 25 in the A2 direction, in this example, three semicylindrical protrusions 26 arranged at equal angular intervals in the R1 and R2 directions. And a closing member 28 with an arm portion 27 which are integrally provided.

  An annular notch 31 for accommodating a seal ring 30 made of an O-ring is formed at the end in the A1 direction of the cylindrical inner peripheral surface 29 of the inner diameter side flange 21, and A1 of the outer diameter side flange 22 is formed. An annular groove 34 for accommodating a seal ring 33 made of an O-ring that elastically contacts the end face 25 is formed on the end face 32 in the direction.

  As shown in detail in FIGS. 7 to 10, the partition member 6 is a disc having a cylindrical outer peripheral surface 42 that is movably in contact with the cylindrical inner peripheral surface 41 of the cylindrical portion 23 in the A1 and A2 directions. The main body 43 and the disc-shaped main body 43 protrude in the A1 direction integrally from the radial outer edge of the end surface 44 in the A1 direction, and are engaged with the three protrusions 26 without gaps in the R1 and R2 directions. A plurality of, in this example, three semi-cylindrical protrusions 45 arranged at equal angular intervals in the R2 direction and a large diameter projecting integrally from the end face 44 in the A1 direction of the disc-shaped main body 43 in the A1 direction. Disc-shaped portion 46, a small-diameter disc-shaped portion 48 integrally projecting from end surface 47 in the A1 direction of disc-shaped portion 46, and end surface 49 of disc-shaped portion 48 in the A1 direction. It protrudes in the A1 direction and is a truncated cone 50 and a columnar projection 52 integrally projecting in the A1 direction from the projecting end of the truncated cone 51 in the A1 direction. The end surface 54 in the A1 direction has an end surface 44, an end surface 47, an end surface 49, and a frustoconical surface 50.

  The disc-shaped main body 43 has an annular groove 56 in which a seal ring 55 made of an O-ring that elastically contacts the inner peripheral surface 41 is mounted on the outer peripheral surface 42, and a cylindrical recess 57 that opens into the storage chamber 5. Each of the communication holes 9 formed in the disc-shaped main body 43, the disc-shaped portion 46, and the disc-shaped portion 48 of the partition member 6 that are respectively provided in the end face 58 in the A2 direction and are opposed in the radial direction, One end in the A1 direction opens at the end face 49 of the disc-shaped portion 48, and one end in the A2 direction opens at the recessed end face 59 of the disc-shaped main body 43 that defines the bottom surface of the recess 57, and passes through the recess 57. And communicates with the storage chamber 5.

  The partition member 6 is movable in the A1 direction and the A2 direction with respect to the container 2 by the engagement of the protrusion 45 with the protrusion 26, while being stationary in the R1 and R2 directions with respect to the container 2, in other words, in the container 2 The container 2 is arranged in the container 2 so as not to rotate in the R1 and R2 directions but in the same direction as the container 2 in the R1 and R2 directions, and in the container 2 in cooperation with the closing member 28 of the container 2. The storage chamber 4 in the A1 direction is partitioned in this space.

  As shown in detail in FIGS. 7, 9 and 10 to 13, the moving force applying means 7 is rotatable in a space inside the container 2 so as to be rotatable in the R1 and R2 directions with respect to the container 2. A plurality of members 61, which are formed between the end face 62 in the A1 direction of the rotatable member 61 and the end face 58 in the A2 direction of the partition member 6 facing the end face 62 and inclined with respect to the A1 and A2 directions, this example Then, there are provided inclined surface means 65 having three inclined surfaces 63 and 64, respectively.

  As shown in particular detail in FIGS. 11 to 13, the rotatable member 61 has a large cylindrical outer peripheral surface 71 that is in contact with the cylindrical inner peripheral surface 41 of the cylindrical portion 23 so as to be rotatable in the R1 and R2 directions. The disc-shaped main body 72 having a diameter and the central portion of the end surface 73 of the disc-shaped main body 72 in the A2 direction are integrally projected in the A2 direction, and on the inner peripheral surface 29 of the inner diameter side flange portion 21 in the R1 and R2 directions. A small-diameter annular portion 75 having a cylindrical outer peripheral surface 74 that is rotatably contacted. The rotatable member 61 cooperates with the partition member 6 to partition the storage chamber 5 in the container 2. In addition, the seal ring 30 is in contact with the outer peripheral surface 74 of the annular portion 75 and a disc-like shape by being in contact with the inner flange 21 at the end surface 73 so as to be rotatable in the R1 and R2 directions. It is in elastic contact with the end surface 73 of the main body 72.

  The disc-shaped main body 72 and the annular portion 75 have a hexagonal bottomed groove 76 at the center thereof, and a rotating shaft 77 having a hexagonal cross section is fitted into the bottomed groove 76. The rotation input relative to the container 2 in the R1 and R2 directions is added to the rotatable member 61 by the rotation shaft 77.

  As shown in particular detail in FIGS. 7 and 9 to 12, the inclined surface means 65 is integrally formed on the end surface 62 of the disk-shaped main body 72 of the rotatable member 61 so as to protrude in the A1 direction and R1. And a plurality of, in this example, three rotatable member protrusions 81 arranged at equiangular intervals in the R2 direction and the end surface 58 of the disc-shaped main body 43 of the partition member 6 are integrally projected in the A2 direction. And a plurality of, in this example, three partition member protrusions 82 arranged at equal angular intervals in the R1 and R2 directions so as to mesh with the rotatable member protrusion 81.

  Each rotatable member protrusion 81 is orthogonal to the A1 and A2 directions and has a bottom surface 85 that is flush with the end surface 62, and an inclination extending from the bottom surface 85 in the R1 direction (clockwise direction in FIG. 12) at an angle θ1. Each partition member protrusion 82 has a top surface 86 orthogonal to the A1 and A2 directions and in contact with the bottom surface 85, and an R1 direction (clockwise in FIG. 9) with an angle θ2 from the top surface 86. The inclined surfaces 64 extending in the direction of the surroundings and contacting the corresponding inclined surfaces 63, and thus the inclined surfaces 63 and 64 are rotatable members so as to be in sliding contact with each other in the R1 and R2 directions. The protrusion 81 and the partition member protrusion 82 are formed respectively.

  When the rotatable member 61 is similarly rotated in the R2 direction by the rotation input in the R2 direction from the rotation shaft 77, the moving force applying means 7 is moved by the inclined surfaces 63 that rotate in the R2 direction as shown in FIG. While sliding on the inclined surface 64, each inclined surface 64 is pressed in the A1 direction to move the partition member 6 in the A1 direction against the elastic force from the elastic means 8, while the rotational input in the R2 direction from the rotating shaft 77 is released. Then, each inclined surface 64 is pressed against each inclined surface 63 in the A2 direction by the elastic force from the elastic means 8 via the partition member 6, and thereby each inclined surface 63 slides on each inclined surface 64 in the R1 direction. As a result of the rotation, each top surface 86 comes into contact with the bottom surface 85, and as shown in FIG. 2, the partition member 6 is returned to the original movement position, and the rotatable member 61 is returned to the original rotation position. R2 direction relative to container 2 Rotary input adapted to provide such a moving speed corresponding to the rotational speed of the R2 direction of the rotary type a moving force to the partition member 6 to the A1 direction by.

  The elastic means 8 is compressed between the end face 25 of the closing member 28 and the end face 44 of the disc-shaped main body 43 in contact with each other at each end, and the disc-like portion 46 and the disc-like portion. 48 has a coil spring 88 disposed so as to surround 48, and the elastic force of the coil spring 88 biases the disc-shaped main body 43 in the A2 direction to the rotatable member 61 of the moving force applying means 7 in the R1 direction. The rotation return force is given.

  As shown in particular detail in FIGS. 6 and 14, the flow restricting means 10 has a through-hole 92 that opens in the accommodating chamber 4 in the A1 direction on the end surface 91 in the A1 direction, and A1 of the partition member 6. In cooperation with the end face 47, the end face 49, and the frustoconical surface 50 of the directional end faces 54, one side communicates with the through hole 92, while the other forms a variable cross-section passage 93 that communicates with the communication hole 9. A variable passage formed by the end face 94 in the A2 direction facing the end face 47, the end face 49, and the frustoconical surface 50 of the end face 54 in the A1 direction of the partition member 6 so as to be movable in the A1 and A2 directions. Synthetic resin as a plastic spring that surrounds the member 95 and the end surface 94 of the variable passage forming member 95 in the A2 direction and the end surface 54 of the partition member 6 in the A1 direction. Screw And it includes a spring 96.

  The variable passage forming member 95 is formed integrally with the circular plate-like portion 97 having the through-hole 92 in which the cylindrical protrusion 52 is disposed, and the plate-like portion 97 extending in the A2 direction, and the communication hole 9. A pair of leg portions 98 attached to each of the first and second leg portions 98 and the end portions of the leg portions 98 protruding from the communication hole 9 are integrally formed and engaged with a depressed end surface 59 as shown in FIG. The leg portion 98 has a flange portion 99 that prevents the leg portion 98 from coming off from the communication hole 9 in the A1 direction.

  The end surface 94 is integrally formed with a leg 98, is surrounded by the flat surface 100, and an annular flat surface 100 that is in contact with one end of the spiral spring 96 radially outward of the leg 98. It has a frustoconical surface 101 that is complementary to the frustoconical surface 50 of the partition member 6 and faces the frustoconical surface 50.

  The variable cross-section passage 93 communicates with the frustoconical passage 105 and the frustoconical passage 105 formed by the frustoconical surface 50 of the partition member 6 and the frustoconical surface 101 of the variable passage forming member 95. The inner annular passage 106 formed by the end surface 49 of the partition member 6 and the flat surface 100 and the outer annular passage formed by the end surface 47 of the partition member 6 and the flat surface 100 while communicating with the inner annular passage 106. 107 and the frustoconical passage 105 is placed in the storage chamber 4 via an annular gap between the columnar protrusion 52 arranged in the through hole 92 and the plate-like part 97 in the through hole 92. The inner annular passage 106 communicates with the communication hole 9, and the outer annular passage 107 communicates with the receiving chamber 4 at the outer edge in the radial direction through a gap between the turns of the spiral spring 96. .

  The helical spring 96 as a plastic spring is made of a synthetic resin having an elastic coefficient that becomes small (softens) at high temperatures and becomes large (hardens) at low temperatures.

  The flow restricting means 10 is a slow low-speed movement of the partition member 6 in the A1 direction in which the internal pressure of the viscous fluid 3 in the storage chamber 4 does not increase so much with respect to the internal pressure of the viscous fluid 3 in the storage chamber 5, that is, from the rotation shaft 77. 16, the flat surface 100 is set to such an extent that the helical spring 96 is not elastically contracted in the axial direction due to the internal pressure of the viscous fluid 3 in the storage chamber 4 as shown in FIG. The spiral spring 96 whose other end is in contact with the end face 47 is pressed in the axial direction, and has a passage cross-sectional area determined by the axial length of the spiral spring 96 that does not elastically greatly contract in the axial length. The truncated conical passage 105, the inner annular passage 106 and the outer annular passage 107, and the annular gap between the cylindrical protrusion 52 and the plate-like portion 97 in the through-hole 92, the communication hole 9 and the recess 57. Contain 4 is communicated with the accommodating chamber 5, to generate a small resistance force to slow the movement of the A1 direction of the partitioning member 6 by allowing the flow of the communication of such into the accommodation chamber 5 from the accommodation chamber 4 of the viscous fluid 3.

  The partition member 6 in which the internal pressure of the viscous fluid 3 in the storage chamber 4 becomes very large relative to the internal pressure of the viscous fluid 3 in the storage chamber 5 is moved in the A1 direction at high speed, that is, relative to the rotational shaft 77 in the R2 direction. In the rotational input, the flow restricting means 10 presses the plate-like portion 97 of the variable passage forming member 95 against the helical spring so that the helical spring 96 is elastically greatly contracted in the axial length by the large internal pressure of the storage chamber 4. The frustoconical passage 105, the inner annular passage 106 and the outer annular passage 107 are narrowed to reduce the passage cross-sectional area, and the frustoconical passage 105 having the reduced passage cross-sectional area, the inner circle The accommodating chamber 4 is communicated with the accommodating chamber 5 via the annular passage 106 and the outer annular passage 107, and the flow of the viscous fluid 3 from the accommodating chamber 4 to the accommodating chamber 5 is performed with great resistance by such communication. A large resistance force is generated in the high-speed movement in the A1 direction, and a variable passage is formed when the rotatable member 61 is rotated in the R2 direction by an even faster rotation input in the R2 direction relative to the rotation shaft 77. By elastically pressing the plate-like portion 97 of the member 95 against the helical spring 96, the helical spring 96 is further elastically contracted and deformed in the axial direction, and the frustoconical passage 105, the inner annular passage 106, and the outer annular shape are deformed. By making the passage cross-sectional area of the passage 107 an extremely small value determined by the axial length of the helical spring 96 that is greatly contracted in the axial direction, the flow of the viscous fluid 3 in the accommodation chamber 4 to the accommodation chamber 5 is substantially reduced. The shock absorber is made extremely small and substantially prevents such high-speed rotation through the partition member 6, and thus prevents the shock absorber from rotating to rotate the rotating shaft 77 at high speed. Securely hold .

  When the relative rotation input in the R2 direction from the rotation shaft 77 disappears after the partition member 6 is moved in the A1 direction as shown in FIG. 16, the flow restricting means 10 causes the partition member to move by the elastic force of the coil spring 88. 6 starts to move in the A2 direction, and as a result of this movement, the variable passage forming member 95 is moved relative to the partition member 6 in the A1 direction as shown in FIG. The communication between the inner annular passage 106 and the outer annular passage 107 and the storage chamber 4 is restored and the truncated conical passage 105, the inner annular passage 106, and the outer circle having the passage cross-sectional area of the original size. An annular passage 107 is formed, and the flow of the viscous fluid 3 from the storage chamber 5 to the storage chamber 4 is performed with a small resistance, and the partition member 6 is quickly moved in the A2 direction with such a small resistance force. Top 86 Rotatable member 61 is returned to the original to the initial position in contact with the bottom surface 85 of the corresponding.

  The helical spring 96 having a modulus of elasticity that becomes smaller at high temperatures but becomes large at low temperatures is greatly elastically deformed at high temperatures, while being elastically deformed at low temperatures. The axial length of the spiral spring 96 based on the axial contraction is determined by a synergistic action with the viscous fluid 3 having a positive temperature characteristic with respect to the fluidity, which increases the fluidity, while the fluidity decreases at low temperatures. The temperature dependence of the flow resistance of the viscous fluid 3 flowing through the variable cross-section passage 93 including the truncated conical passage 105, the inner annular passage 106, and the outer annular passage 107 having a passage cross-sectional area can be reduced. Thus, for example, the hardness in the A2 direction of the damper 1 in the case of high-speed rotation input exceeding a certain value when the impact is large at high temperatures and the constant when the impact is large at low temperatures The difference between the hardness of the damper 1 in the direction A2 in the case of high-speed rotation input exceeding the same value can be reduced, and the absorbent body can be reliably held with a hardness that does not differ much at high and low temperatures in the A2 direction. Become.

  The above damper 1 may be used for a vehicle seat 201 as shown in FIGS. 17 and 18, for example. That is, the vehicle seat 201 of this example includes a seat seat 203 that is attached to the vehicle floor 202 so that the front and rear position and the tilt position can be adjusted, and a vehicle backrest 204 that is attached to the seat seat 203 so that the tilt position can be adjusted. A headrest 205 supported to be able to move forward on the backrest 204, in this example to be rotatable in the forward R3 direction, a rotation urging means 206 for urging the headrest 205 in the forward R3 direction, and a headrest The prohibition mechanism 207 that prohibits the rotation of the headrest 205 in the R3 direction, and the release of the prohibition of the movement of the headrest 205 in the R3 direction by the prohibition mechanism 207 at a moving speed exceeding a certain value to the back of the vehicle applied to the backrest 204 Means 208.

  An attachment mechanism for attaching the seat seat 203 to the floor 202 so that the front and rear position and the tilt position can be adjusted and an attachment mechanism for attaching the backrest 204 to the seat seat 203 so that the tilt position can be adjusted are well known, and detailed description thereof will be omitted.

  The headrest 205 includes a headrest body 211 and a support member 213 fixed to the headrest body 211 and supported by a frame (not shown) of the backrest 204 so as to be rotatable in the R3 direction via a shaft 212. The support member 213 is prevented from rotating in the direction opposite to the R3 direction by a stopper 214 fixed to the frame of the backrest 204.

  The rotation biasing means 206 as the movement biasing means includes a coil spring 215 having one end fixed to the frame of the backrest 204 and the other end fixed to the support member 213. The headrest 205 is always urged to rotate in the R3 direction by the elastic force.

  The prohibiting mechanism 207 is supported by the frame of the backrest 204 so as to be rotatable in the R4 direction via the shaft 216, and abuts and engages with the tip of the support member 213 to rotate the support member 213 in the R3 direction. And a stopper 218 and a coil spring 219 for setting the flange member 217 to a contact and engagement position with the tip of the support member 213.

  The release means 208 includes a load-rotation conversion mechanism 222 that is displaced by a load applied to the back support portion 221 of the backrest 204 from the occupant seated on the seat seat 203, and a rear side of the vehicle that is applied to the back support portion 221 of the backrest 204. A transmission mechanism 223 that transmits a force based on a speed exceeding a certain value to the prohibiting mechanism 207, but does not transmit a force based on a speed equal to or less than a certain value applied to the back receiving portion 221 of the backrest 204 to the prohibiting mechanism 207. have.

  The load-rotation conversion mechanism 222 includes a rotary shaft 77 rotatably supported on the frame of the backrest 204, and a load receiving plate 225 fixed to the rotary shaft 77 and disposed on the back support portion 221 of the backrest 204. The load receiving plate 225 that is rotatably supported by the frame of the backrest 204 via the rotation shaft 77 is embedded in a cushion in the back receiving portion 221 of the backrest 204.

  The transmission mechanism 223 includes a support shaft 226 supported by the frame of the backrest 204, a damper 1 supported on the support shaft 226 by the closing member 28 of the container 2 so as to be rotatable in the R1 and R2 directions, and at one end of the damper 1 A wire 227 connected to the arm portion 27 and connected to the flange member 217 at the other end is provided.

  In the damper 1 of this example, a recess for receiving one end of the support shaft 226 is formed in the other end surface 228 of the closing member 28, and the container 2 of the damper 1 is interposed via the support shaft 226 and the recess. The frame 204 of the backrest 204 is supported so as to be rotatable in the directions R1 and R2 about the support shaft 226. The rotation shaft 77 having a hexagonal cross section is formed in a hexagonal shape at the center of the disc-shaped main body 72 and the annular portion 75. Thus, the container 2 of the damper 1 is semi-fixed by the elastic force of the coil spring 219 via the wire 227 and the flange member 217 with respect to the rotation in the R2 direction.

  In the vehicle seat 201 described above, when the passenger's normal load is applied to the backrest 204 when the occupant is seated on the seat seat 203, or when the occupant is seated on the seat seat 203, In the case of the addition of occupant loads behind the vehicle to the backrest 204 due to acceleration, these loads on the backrest 204 are slowed down at a speed below a certain value, resulting in such occupant loads. The load receiving plate 225 is rotated slowly in the R2 direction about the rotation shaft 77 without causing the container 2 that is semi-fixed with respect to the rotation in the R2 direction to rotate in the R2 direction by the elastic force of the coil spring 219. This slow rotation of the load receiving plate 225 is a frustoconical passage 105 having a passage cross-sectional area determined by the axial length of the helical spring 96 that does not elastically contract greatly, the inner annular passage 106, and From the accommodating chamber 4 to the accommodating chamber 5 of the viscous fluid 3 through the outer annular passage 107 and the annular gap between the cylindrical protrusion 52 and the plate-like portion 97 in the through hole 92, the communication hole 9 and the recess 57. As a result, the load receiving plate 225 and thus the backrest 204 are moderately buffered. On the other hand, in the slow rotation of the load receiving plate 225, the inclined surface means 65 The rotatable member 61 is idled in the R2 direction with respect to the partition member 6, and the rotatable member 61 and the container 2 are disconnected from each other with respect to the rotation in the R2 direction. Abutment, disengagement Such a pulling force that causes rotation of the flange member 217 in the R4 direction is not generated in the wire 227 via the container 2, and the prohibiting mechanism 207 prohibits rotation in the R3 direction in front of the headrest 205. Maintained in normal position.

  Further, in the vehicle seat 201, a large speed exceeding a certain rearward value is generated in the occupant seated on the seat seat 203 after the rear-end collision, and the load receiving plate 225 is suddenly rotated in the R2 direction about the rotation shaft 77. Then, the rotation of the rotating shaft 77 in the R2 direction at a speed exceeding this constant value has a passage cross-sectional area determined by the axial length of the helical spring 96 that is greatly elastically contracted in the axial direction. As a result of restricting the flow of the viscous fluid 3 from the storage chamber 4 to the storage chamber 5 by the variable cross-section passage 93 including the head-conical passage 105, the inner annular passage 106, and the outer annular passage 107, the rotatable member 61 and the container 2 As a result of being connected with respect to the rotation in the R2 direction via the partition member 6, the rotation at a speed exceeding the predetermined value of the rotation shaft 77 in the R2 direction overcomes the elastic force of the coil spring 219. The container 2 is caused to rotate in the R2 direction around the support shaft 226 via the rotatable member 61 and the partition member 6, and thus the contact and engagement with the tip of the support member 213 are released. A pulling force is generated in the wire 227 that causes the hook member 217 to rotate, and the hook member 217 of the prohibiting mechanism 207 is in the R4 direction with the shaft 216 as the center so as to release contact and engagement with the tip of the support member 213. The headrest 205 is urged by the coil spring 215 and rotated in the R3 direction so as to hold the head of the occupant.

  As described above, in the vehicle seat 201, a force based on a speed exceeding a certain rearward value of the vehicle applied to the backrest 204 is transmitted to the prohibiting mechanism 207, and the prohibiting mechanism 207 rotates the headrest 205 in the forward R3 direction. Switching that maintains the prohibition of the rotation of the headrest 205 in the forward R3 direction by the prohibiting mechanism 207 without canceling the prohibition but without transmitting the force to the prohibiting mechanism 207 based on the speed below a certain value applied to the backrest 204 Since the transmission mechanism 223 having the damper 1 as a mechanism is provided, the headrest 205 is reliably moved only in the forward R3 direction only when the rear impact is made by accurately discriminating between the rear impact and the like. Can be moved to.

  In the example of the vehicle seat 201 described above, after the headrest 205 is moved in the R3 direction in front of the headrest 205, the headrest 205 is forcibly rotated in a direction opposite to the R3 direction, and the tip of the support member 213 is tilted with the flange member 217. By sliding the collar member 217 in the reverse direction by sliding on the surface, the contact and engagement of the tip of the support member 213 with the collar member 217 can be restored. Although the wire 227 is used in the above example, a gear mechanism, a rack-pinion mechanism, or the like may be used instead.

It is side surface explanatory drawing of the preferable example of embodiment by this invention. It is side surface explanatory drawing of the example shown in FIG. FIG. 2 is an exploded explanatory diagram of the example shown in FIG. 1. FIG. 2 is an enlarged explanatory view of a part of the example container shown in FIG. 1. It is right side explanatory drawing of a part of container shown in FIG. FIG. 3 is an enlarged explanatory view of a variable passage forming member shown in FIG. 2. It is expansion explanatory drawing of the division member etc. which are shown in FIG. FIG. 8 is a left side explanatory view of the partition member and the like shown in FIG. 7. It is right side explanatory drawing of the division member etc. which are shown in FIG. FIG. 3 is an enlarged cross-sectional explanatory diagram of the partition member and the like shown in FIG. 2. FIG. 3 is an enlarged explanatory view of a part of the moving force applying unit and the like shown in FIG. 2. FIG. 12 is a left side explanatory view of the moving force applying means and the like shown in FIG. 11. It is right side explanatory drawing, such as a moving force provision means shown in FIG. FIG. 3 is an enlarged cross-sectional explanatory view of a partition member and a variable passage forming member shown in FIG. 2. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is side surface explanatory drawing of the example which used the example shown in FIG. 1 for a vehicle seat. It is front explanatory drawing of the example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damper 2 Container 3 Viscous fluid 4, 5 Storage chamber 6 Partition member 7 Movement force provision means 8 Elastic means 9 Communication hole 10 Flow restriction means

Claims (8)

The container and the inside of the container are divided into two storage chambers that store the viscous fluid in the axial direction of the container and rotate with the container in a direction around the axis of the container, while the container rotates in the axial direction of the container. And a movable partition member, and a rotational force in one direction relative to the container in the direction around the axis of the container causes a rotational force to be applied to the partition member in one direction in the axial direction. A moving force applying means for giving a moving speed corresponding to the speed, an elastic means for elastically urging the partition member in the other axial direction with respect to the container, and two storage chambers in the container. Viscous fluid accommodated in a storage chamber in one direction in the axial direction based on movement of at least one communication hole formed in the partition member so as to communicate with each other and movement of the partition member in one direction in the axial direction Internal pressure exceeding a certain value And the flow restricting means for restricting the flow of the viscous fluid in one direction of the accommodating chamber in the axial direction through the communication hole to the accommodating chamber in the other direction of the axial direction. And having a through-hole that opens in the accommodating chamber in one direction in the axial direction at the end surface in one direction in the axial direction and penetrating on one side in cooperation with the end surface in one direction of the partition member One end face in the other axial direction faces the end face in one direction in the axial direction of the partition member so as to form a variable cross-sectional passage communicating with the communication hole on the other side and the other side in the axial direction of the partition member. A variable passage forming member movably mounted on the partition member, and a plastic spring disposed between an end surface in the other axial direction of the variable passage formation member and an end surface in one axial direction of the partition member and it comprises a, Plasti Kubane, while the elastic coefficient becomes small at high temperature, ing from larger plastic spiral spring at low temperature damper.   The moving force applying means includes a rotatable member disposed in the container so as to be rotatable in a direction around the axis of the container, an end face in one direction in the axial direction of the rotatable member, and an end face in the one direction. 2. An inclined surface means that is formed between end faces in the other axial direction of the partition member facing each other and has an inclined surface inclined with respect to the axial direction. damper.   The inclined surface means is integrally formed on one end face of the rotatable member so as to protrude in one direction in the axial direction and has a plurality of rotatable member protrusions arranged in the direction around the axial center. A plurality of compartments that are integrally formed on the end face in the other direction of the partition member so as to protrude in the other axial direction and are arranged in the direction around the shaft center so as to mesh with the protrusions of the rotatable member The damper according to claim 2, further comprising a member protrusion, wherein the inclined surface is formed on each of the rotatable member protrusion and the partition member protrusion so as to be in sliding contact with each other.   The partition member is formed with a plurality of communication holes, and the variable passage forming member is formed integrally with the plate-like portion having a through-hole, and the plurality of communication holes. A leg portion mounted on the leg portion and a flange portion integrally formed at an end portion of the leg portion protruding from the communication hole and preventing the leg portion from coming out of the communication hole are provided. 4. The damper according to any one of 3 above.   The partition member has a frustoconical surface on one end face in the axial direction, and the variable passage forming member is complementary to the frustoconical surface of the partition member and faces the frustoconical surface. And a variable cross-sectional passage has a frustoconical passage formed by the frustoconical surface of the partition member and the frustoconical surface of the variable passage forming member. The damper as described in any one of 1-4. A backrest of the vehicle, a headrest supported by the backrest so as to be movable forward of the vehicle, a moving urging means for urging the headrest to move forward, and a prohibiting mechanism for prohibiting the headrest from moving forward And a release means for releasing the prohibition of forward movement of the headrest by this prohibition mechanism at a moving speed exceeding a certain value to the rear of the vehicle that is added to the backrest, and the release means is a backrest portion of the backrest A load-rotation conversion mechanism for converting a load applied to the vehicle to a rotational force, and a transmission mechanism for transmitting a force based on a moving speed exceeding a predetermined value to the back of the vehicle applied to the backrest to the prohibition mechanism. The mechanism has the damper according to any one of claims 1 to 5, and one of the damper container and the moving force applying means receives the rotational force from the load-rotation conversion mechanism as a rotational input. To receive The other of the damper container and the moving force applying means is connected to the heavy-rotation conversion mechanism, and the other is to transmit a force based on a moving speed exceeding a certain value to the rear of the vehicle applied to the backrest to the prohibiting mechanism. The vehicle seat connected to the prohibition mechanism. The vehicle seat according to claim 6, wherein the load-rotation conversion mechanism includes a load receiving plate that is rotatably supported by the backrest frame and that is disposed on a backrest portion of the backrest. The headrest is supported so as to be pivotable or linearly movable forward on the backrest, and the moving urging means is configured to rotate or linearly urge the headrest forward. The vehicle seat according to claim 6 or 7, wherein forward rotation or direct movement is prohibited.

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