JP4857068B2 - Vehicle seat rotation mechanism - Google Patents

Description

  The present invention relates to a vehicle seat turning mechanism. More specifically, the present invention relates to a vehicle seat turning mechanism that supports the seat so that the seat can be turned upside down.

2. Description of the Related Art Conventionally, some seats for automobile seats employ a tumble mechanism that can raise the seat from the floor surface of the vehicle and store it in a retracted state. In this tumble mechanism, the seat is hinge-connected to the floor at a front end portion thereof so that the seat can be turned upside down. The tumble mechanism is assembled with a spring member that urges the seat in the turning direction to raise the seat from the floor surface. Here, Patent Document 1 below discloses a sheet device in which a helical spring that wakes up a sheet and urges the sheet in the turning direction is incorporated. In this disclosed technique, two helical springs are assembled in such a manner that they exert an urging force in opposite rotation directions, and one of the helical springs exerts a braking force against the raising urging force of the seat. It is supposed to act.
On the other hand, the seat is provided with a locking device that can be engaged with and disengaged from a striker installed on the floor side at a rear end portion thereof. This locking device engages with the striker by performing a pushing operation so as to drop the seat onto the floor surface. Therefore, by engaging with the striker, the seat can be held in a posture in which the seat is laid down on the floor surface. The lock device is released from the above-described engaged state with the striker by operating an operation lever for storing the sheet. Therefore, by this release, the seat is automatically raised from the floor surface in accordance with the urging force of the spring member assembled to the tumble mechanism.
In order to return the seat raised from the floor surface to the original seating posture, the seat is pushed down against the bias of the spring member described above, and the lock device is engaged with the striker. Thereby, it can hold | maintain as a posture state which made the sheet fall on the floor surface again.
JP 2003-327028 A

However, in the above-described conventional technology, when the locking device is engaged with the striker by the operation of folding the seat, the sheet may be strongly struck against the floor-side surface due to the pushing force applied during the engagement. is there. That is, the seat is brought down toward the floor surface and finally engaged with the floor by performing an operation of strongly pushing the lock device into the striker. The locking device receives the strong pushing operation force described above, so that an assembly part inside the locking device is pushed and moved to engage with the striker. Therefore, as the locking device engages with the striker, the sheet is strongly struck against the floor surface by the pushing force.
Therefore, for example, in the case where the seat is provided with a sensor component such as a weight detection sensor that controls the deployment of the airbag, there is a possibility that the sensor component may be abnormal due to a load when the seat is struck.

  The present invention was devised as a solution to the above-described problems, and the problem to be solved by the present invention is that the seat and the floor side surface when the vehicle seat is brought down on the floor surface It is to reduce the load at the time of contact.

In order to solve the above problems, the vehicle seat turning mechanism of the present invention takes the following means.
A first aspect of the invention is a vehicle seat rotation mechanism that supports a vehicle floor so that the seat can be pivoted up and down, and includes a fixed member, a movable member, and a spring member. The fixing member is disposed integrally with the floor. The movable member is connected to the fixed member so as to be relatively rotatable, and is disposed integrally with the seat. The spring member is in an arrangement state in which the movable member can exert an urging force in a rotational direction in which the seat is raised from the floor surface with respect to the fixed member. The seat is provided with a lock member that can be engaged with and disengaged from an engagement member installed on the floor. The engagement structure between the lock member and the engagement member is a push-type lock structure in which the lock member is pushed into each other by applying a pressing force that pushes the lock member into the engagement member. The movable member and the fixed member that support the seat so that the seat can be rotated up and down are connected via a rotary damper using a viscous fluid. The rotary damper is configured to be able to exert a braking action force by generating torque in both directions in proportion to the angular velocity of the bidirectional movement in which the seat is rotated up and down. In the rotary damper, the braking action force acting in one rotation direction that causes the seat to fall on the floor surface is greater than the braking action force acting in the other rotation direction that raises the seat from the floor surface. ing.
According to the first aspect of the invention, the rotary damper applies the braking action force that suppresses the respective rotational speeds to the bidirectional movement in which the seat is rotated up and down. The braking action force by the rotary damper acts relatively large in one rotational direction that causes the seat to fall on the floor surface. The braking force that acts in this one rotation direction is set to such an extent that the rotation speed in the tilting direction accompanying the pushing operation of the sheet when the lock member is engaged with the engagement member can be suppressed. It is preferred that This prevents a situation in which, after the lock member is engaged with the engagement member, the sheet collides with the contact surface on the floor side excessively due to the bounce during the pushing operation. As a result, the load on the sensor component due to the contact between the seat and the contact surface on the floor side is reduced. In addition, it is preferable that the braking action force acting in other rotation directions is set to such an extent that the rotation speed in the seat raising direction can be suppressed. Thereby, it is restrained that the raising speed of the seat that accompanies the biasing of the spring member does not give too much bounce.

Next, in a second aspect based on the first aspect described above, the seat is provided with a sensor component such as a weight detection sensor capable of detecting the weight of the occupant.
According to the second aspect of the invention, since the seat is provided with a sensor component such as a weight detection sensor, if the seat comes into contact with the contact surface on the floor side excessively, the sensor component is abnormal. It becomes a structure with a possibility of becoming.

Next, according to a third invention, in the first or second invention described above, the rotary damper is configured such that the rotor is rotatably accommodated on the central axis of the cylindrical damper case, and the damper case and the cylinder A fluid chamber formed in a gap with the internal rotor is filled with a viscous fluid in a sealed state. The partition wall or vane that partitions the fluid chamber is formed with a fluid passage through which the viscous fluid can flow when the rotor is rotated relative to the damper case, and the flow rate of the viscous fluid passing through the fluid passage is rotated. A valve member is provided which can be changed depending on the direction. The valve member acts to narrow the flow rate of the viscous fluid passing through the fluid passage when turning in one direction in which the seat is brought into the floor surface than when turning in the other direction.
According to the third aspect of the invention, when the seat is rotated in one direction to be brought down on the floor surface, the flow rate of the viscous fluid passing through the fluid passage is narrowed by the valve member provided in the rotary damper. As a result, a relatively large braking force acts on the relative rotation of the rotor with respect to the damper case.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first invention, there is provided a rotary damper capable of exerting a torque in both directions, and particularly capable of exerting a relatively large braking action force specially in a rotating direction in which the seat is brought down on the floor surface. By providing, it is possible to prevent a situation in which the seat collides with the contact surface on the floor side excessively due to the bounce during the pushing operation for engaging the lock member with the engagement member. Thereby, the load at the time of the contact between the seat and the floor side surface when the vehicle seat is brought down on the floor surface can be reduced. The rotary damper can also suppress the rotational speed when the seat is raised from the floor surface.
Further, according to the second invention, even if sensor parts such as a weight detection sensor are disposed on the seat, the rotational speed of the seat is suppressed by the rotary damper, so that the seat is raised and lowered. It is possible to avoid applying a load that causes an abnormality to the sensor component during rotation.
Further, according to the third aspect, the rotary damper is bi-directionally exerting a relatively large braking force in one rotation direction, and the rotor is accommodated on the central axis of the cylindrical damper case so as to be pivotable. It can be embodied as a configuration.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

First, the structure of the rotation mechanisms 80 and 80 of the present embodiment will be described with reference to FIG. Here, in FIG. 2, a schematic configuration of the entire sheet 1 is represented by a side view. As will be described later, the rotation mechanisms 80 and 80 are disposed in a pair in the width direction between the seat 1 and the floor F, but only one of them is shown in each drawing.
As shown in FIG. 2, the seat 1 includes a seat back 2 that serves as a backrest portion and a seat cushion 3 that serves as a seating portion. The seat back 2 is connected to the seat cushion 3 via a pair of reclining devices 4 and 4 disposed at lower ends on both sides in the width direction. These reclining devices 4 and 4 are normally held in a locked state in which the inclination angle of the seat back 2 with respect to the seat cushion 3 can be fixed. The reclining devices 4 and 4 can be simultaneously switched to the unlocked state by performing the pulling operation of the operation cables 4k and 4k for operating the operation arms 4a and 4a provided thereon. These operation cables 4k and 4k are connected to a release lever (not shown) for releasing the locked state of the lock devices 5 and 5 to be described later, and are pulled by performing a release operation of the release lever. It has become. Here, a spring member (not shown) is provided between the seat back 2 and the seat cushion 3 to urge the seat back 2 toward the seat cushion 3 in the forward rotation direction. As a result, the seat back 2 is automatically moved forward toward the seat cushion 3 around the central axis 4r of the reclining devices 4 and 4 by performing a release operation of a release lever (not shown) described above. Thereby, as FIG. 1 shows, the sheet | seat 1 can be switched to the attitude | position state of folding.

Returning to FIG. 2, the seat 1 is slidable in the front-rear direction with respect to the vehicle floor F by a pair of slide mechanisms 6, 6 disposed on both sides in the width direction of the lower portion of the seat cushion 3. Has been. Here, each of the slide mechanisms 6 and 6 has upper rails 6u and 6u provided on the seat cushion 3 side, and lower rails 6l and 6l provided on the floor F side. The upper rails 6u and 6u are assembled so as to be slidable in the front-rear direction, which is the longitudinal direction of the rails, with respect to the lower rails 6l and 6l. The upper rails 6u and 6u are normally held in a locked state in which sliding movement with respect to the lower rails 6l and 6l is restricted by a lock mechanism (not shown) provided integrally therewith. As a result, the upper rails 6u and 6u are always in an integrated state with the lower rails 6l and 6l. This lock mechanism can be switched to an unlocked state in which sliding movement of the upper rails 6u, 6u is permitted by performing a release operation using an operation lever (not shown).
A weight detection sensor 7 is provided between the upper rails 6 u and 6 u described above and the lower arm 3 f provided at the skeleton portion on the lower end side of the seat cushion 3. The weight detection sensor 7 is installed for the purpose of detecting the weight of an occupant seated on the seat 1 and controlling the deployment of the airbag. That is, when a small person such as a child sits on the seat 1, the weight detection sensor 7 detects the weight of the seat 1 and controls the airbag so as not to deploy, thereby causing damage caused by the deployment of the airbag. Is to prevent.

When the seat 1 is used for seating, the pair of rotating mechanisms 80, 80 provided at the lower position on the front end side of the lower rails 6l, 6l described above and the pair of locks provided at the lower position on the rear end side are provided. The devices 5 and 5 are held in an engaged state with the vehicle floor F.
The former turning mechanisms 80 and 80 are hingedly connected to the floor F so that the seat cushion 3 integrated with the lower rails 6l and 6l can be turned upside down. Winding springs 84 and 84 that urge the seat cushion 3 from the floor F surface in the pivoting direction are assembled to the pivoting mechanisms 80 and 80, respectively. Here, the winding springs 84 and 84 correspond to the spring member of the present invention. As shown in FIG. 1, the urging force exerted by these winding springs 84 and 84 is set to a size that can automatically raise the entire seat 1 from its floor F surface against its own weight. Yes.
The latter locking devices 5 and 5 have a configuration that can be engaged with and disengaged from the two rod-like strikers S and S arranged on the floor F in the width-and-length direction. Here, the locking devices 5 and 5 correspond to the locking member of the present invention, and the strikers S and S correspond to the engaging member of the present invention. These strikers S, S are formed as metal rod-shaped members, and are disposed inside the recesses C, C formed on the floor F, and are fixed in an integrated manner with the floor F. Yes. On the other hand, the locking devices 5 and 5 are installed so as to protrude below the seat cushion 3, and enter the recesses C and C by pressing the seat cushion 3 in the direction of dropping onto the floor F. Here, the lock devices 5 and 5 receive the pressing force pushed into the recesses C and C, respectively, and receive the strikers S and S disposed in the recesses C and C, respectively. It has a push-type lock structure that engages automatically. And each locking device 5 and 5 always maintains the engaging state by engaging with each striker S and S. FIG. Further, as shown in FIG. 1, the locking devices 5 and 5 are engaged with the strikers S and S at the same time by pulling the operation cables 5 k and 5 k connected to a release lever (not shown). To be released.
That is, the seat 1 is held in a state in which the front and rear end portions thereof are engaged with the floor F in a state where the above-described locking devices 5 and 5 are engaged with the strikers S and S, respectively. Then, as shown in FIG. 1, the seat 1 is switched to the folding state described above by releasing a release lever (not shown), and between the locking devices 5, 5 and the strikers S, S. The engaged state is released. As a result, the seat 1 is automatically raised from the floor F surface under the urging force of the winding springs 84 and 84 incorporated in the rotation mechanisms 80 and 80.

Here, the rotary mechanisms 80 and 80 of the present embodiment are assembled with rotary dampers 90 and 90 capable of exerting a braking action force on the bidirectional movement in which the seat 1 is tilted and rotated. Specifically, the rotary dampers 90 and 90 generate braking force in both directions and exert braking and driving power in proportion to the angular velocity of the bidirectional movement in which the seat 1 is rotated up and down. In the rotary dampers 90, 90, the braking action force that works in one rotation direction that causes the seat 1 to fall on the floor F surface works in another rotation direction that raises the seat 1 from the floor F surface. It is configured to work larger than the braking action force.
Specifically, the braking action force acting on the one rotation direction (the tilting direction) is accompanied by the pushing operation of the seat 1 when the locking devices 5 and 5 are engaged with the strikers S and S. It is set to a size (for example, 10 N · m) that allows the seat 1 to gently come into contact with the contact surface on the floor F side while suppressing the rotational speed in the tilting direction. Thus, the weight detection sensor 7 is buffered so that an impact load is not applied to the weight detection sensor 7 at the time of contact between the seat 1 and the contact surface on the floor F side.
Further, the braking action force acting on the other rotation direction (raising direction) suppresses the rotation speed of the seat 1 in the raising direction, and gently raises the seat 1 to the standing position. The size is as large as possible. Specifically, this braking action force is exerted by about 20-30% of the braking action force acting in the one rotational direction described above (for example, 2-3 N · m) due to the structure of the rotary dampers 90, 90. It has come to be. Due to this braking action force, the braking force that suppresses the spring 1 from rotating too fast in the raising rotation speed of the seat 1 due to the urging of the winding springs 84 and 84 in the entire rotation region in the raising direction of the seat 1. It has come to be affected.

Here, the posture state of the rotation mechanisms 80 and 80 in the lying posture state X1 in which the seat 1 has fallen on the floor F in FIG. 1 is shown in detail in FIG. The posture state of the rotation mechanisms 80 and 80 when the seat 1 is raised to the rotation intermediate state X2 in FIG. 1 is shown in detail in FIG. The posture state of the rotation mechanisms 80, 80 when the seat 1 is raised to the standing posture state X3 in FIG. 1 is shown in detail in FIG.
In addition, the angle D1 in FIG. 1 is an angle formed from the lying posture state X1 of the seat 1 to the turning middle state X2, and is set to 55 degrees in this embodiment. The angle D2 is an angle formed by the seat 1 from the turning middle state X2 to the standing posture state X3, and is set to 25 degrees in this embodiment. These angles D1 and D2 are angles formed by line segments connecting the positions of the gravity centers G1 to G3 of the sheet 1 and the shaft member 83 which is the rotation center of the sheet 1, respectively.

Hereinafter, the structure of the rotation mechanisms 80 and 80 will be described in detail. Since the pair of rotation mechanisms 80 and 80 have the same configuration, only the configuration on one side will be described below.
That is, the rotation mechanism 80 includes a movable member 81, a fixed member 82, a shaft member 83, a winding spring 84, and a rotary damper 90.
Specifically, as shown in FIG. 1, the movable member 81 is formed integrally with the front end portion of the lower rail 6 l, and the fixed member 82 is fixed integrally with the floor F. The movable member 81 is connected to the fixed member 82 via the shaft member 83 and is in a state of being rotatable relative to the fixed member 82. Thereby, the movable member 81 can be turned upside down between the lying posture state X1 shown in FIG. 3 and the standing posture state X3 shown in FIG. When the movable member 81 is raised to the standing posture state X3, the end of the long hole 81h formed in the movable member 81 comes into contact with a stopper pin 82p provided in the fixed member 82. The above rotation in the raising direction is restricted.
As shown well in FIG. 3, a winding spring 84 is wound around the shaft member 83 that is the rotational axis of the movable member 81. The end of the coil spring 84 on the center side in the radial direction is hooked on a hook portion 82a provided integrally with the fixing member 82, and is fixed integrally therewith. The winding spring 84 is arranged in a direction in which the spiral shape spreads in the clockwise direction in FIG. 3 in the drawing, and the radially outer end of the spiral spring 84 is hooked on the movable member 81 in a state where the spiral shape is wound. Has been. Specifically, the outer end portion in the radial direction of the winding spring 84 is disposed at a position where the end portion abuts in a counterclockwise direction on a hook pin 81 a provided integrally with the movable member 81. As a result, the movable member 81 is attached in the counterclockwise direction in the drawing along with the movement of the rewinding deformation in which the winding spring 84 rotates its outer end counterclockwise while expanding its spiral shape. It has come to receive power. Then, returning to FIG. 1, the seat 1 receives the urging force of the two winding springs 84, 84 including the winding spring 84 provided on the other side rotation mechanism 80, which is not described, It can be automatically raised from the floor F surface.

  Here, referring back to FIG. 1, in the state where the seat 1 is raised to the mid-rotation state X <b> 2, the position of the center of gravity G <b> 2 reaches a position near the upper portion of the shaft member 83 that is the center of the raising and rotation. It will be in the state. In this state, the load resistance due to the weight of the seat 1 applied to the winding spring 84 is reduced, and the urging action of the winding spring 84 is likely to give rise to the rotational speed of raising the seat 1. It has become. However, for the rotation of the seat 1 in the raising direction, the braking action force by the rotary dampers 90, 90 described above is exerted, so that the seat 1 is decelerated at a moderate speed until the standing posture state X3. It will be woken up.

Next, the configuration of the rotary damper 90 will be described. That is, as shown in FIG. 8, the rotary damper 90 has a configuration in which a rotor 91 is assembled on a central axis of a cylindrical damper case 92 so as to be pivotable. Here, referring to FIG. 3, the rotor 91 is connected to the shaft member 83 that is integrally fixed to the fixing member 82 so as to be integrated in the rotation direction. The damper case 92 is integrally connected to the movable member 81. Thus, the rotary damper 90 is configured such that the rotor 91 pivots relative to the damper case 92 as the movable member 81 is pivoted about the shaft member 83.
Returning to FIG. 8, the rotary damper 90 is formed with fluid chambers r and r filled with a viscous fluid such as silicone oil in a sealed state between the rotor 91 inside the cylinder of the damper case 92. Here, a fluid having a viscosity of 1000 cst or more is used as the viscous fluid. That is, the braking action force exerted by the rotary damper 90 is mainly determined by the degree of sealing of the viscous fluid, and this degree of sealing is determined by whether the processing accuracy is good or bad. Therefore, in the present embodiment, in consideration of the sealing degree of the rotary damper 90 according to the current processing accuracy, a viscous fluid having a viscosity of 1000 cst or more is used, so that one rotational direction (inclination direction) is used. A braking action force of 10 N · m is exerted, and a braking action force of 2 to 3 N · m can be exerted with respect to other rotational directions (raising directions). In the damper case 92, partition walls 92a and 92a for partitioning the fluid chambers r and r are formed at two axially symmetrical positions. On the other hand, the rotor 91 is integrally provided with blade-shaped vanes 91a and 91a at positions between the partition walls 92a and 92a. The vanes 91a and 91a are formed with fluid passages o and o through which the viscous fluid filled in the fluid chambers r and r can flow in both directions. The fluid passages o, o rotate the rotor 91 relative to the damper case 92, whereby each of the fluid chambers r, 91a, 91a moves with the movement of the partition walls 92a, 92a. The viscous fluid in r circulates. Each vane 91a, 91a is provided with a leaf spring-shaped valve member 93, 93 capable of adjusting the flow rate of the viscous fluid passing through the fluid passages o, o.
As shown in FIG. 9, when the viscous fluid is about to flow in the left direction in the drawing with respect to the fluid passages o and o by the relative rotation of the rotor 91, the valve members 93 and 93 have the viscosity. In response to the fluid pressure of the fluid, it bends and deforms and closes the right inlet of the fluid passages o and o. As a result, the flow rate at which the viscous fluid flows into the fluid passages o and o is reduced, the flow resistance is increased, and a relatively large braking action force is exerted against the relative rotation of the rotor 91 in the same direction. On the other hand, as shown in FIG. 10, the viscous fluid tries to flow in the right direction in the drawing with respect to the fluid passages o and o by the relative rotation of the rotor 91 in the direction opposite to the above. In this case, the valve members 93 and 93 are deformed by receiving the flow pressure of the viscous fluid and are in a posture state in which the right outlets of the fluid passages o and o are opened. Therefore, in this case, the viscous fluid passes through the fluid passages o and o while bending and deforming the valve members 93 and 93 against the elasticity of the valve members 93 and 93. Therefore, the flow resistance causes the relative rotation of the rotor 91 in the same direction. A braking force is exerted on the movement. In this case, since the viscous fluid passes through the fluid passages o and o with the doorway being opened, the braking action force is smaller than that in the case of FIG. 9 described above.
The rotary damper 90 is a conventionally known one and is substantially the same as the configuration disclosed in Japanese Patent Application Laid-Open No. 2004-3584.

To summarize the above configuration, as shown in FIG. 1, the rotation mechanisms 80, 80 release the locking devices 5, 5, so that the seat 1 is placed on the floor F by the urging force of the winding springs 84, 84. It automatically wakes up from the lying posture state X1. At this time, the seat 1 is raised while its rotational speed is suppressed by the braking force exerted by the rotary damper 90. Therefore, since the rotation speed of the seat 1 is restrained in a region where the rotation speed due to the biasing is likely to be boosted, a heavy object such as the seat 1 is excessively raised to the standing posture state X3. Can be prevented.
In addition, if the operation of returning the seat 1 raised to the standing posture state X3 to the lying posture state X1 is performed, the seat 1 can be returned to the original posture state in which the seat 1 is urged in the turning direction. Then, as the seat 1 is moved down, the locking devices 5 and 5 are pushed into the strikers S and S on the floor F so that they are engaged and locked to lock the seat 1 on the floor F. Can do. At this time, the seat 1 is brought down while the rotation speed is suppressed by the braking action force exerted by the rotary damper 90. Therefore, it is possible to prevent a situation in which, after the locking devices 5 and 5 are engaged with the strikers S and S, the seat 1 is forced to collide with the contact surface on the floor F side due to the spring during the pushing operation. Thereby, the load applied to the weight detection sensor 7 due to the contact between the seat 1 and the contact surface on the floor F side is reduced.

Next, the configuration of each of the locking devices 5 and 5 will be described with reference to FIGS. Since each of the locking devices 5 and 5 has the same configuration, only one of them will be described. Here, FIG. 6 shows a state where the lock device 5 and the striker S are engaged and locked, and FIG. 7 shows a state where the striker S enters the lock device 5.
That is, as shown in FIG. 6, the lock device 5 includes two base members 10, 10, a hook 20, a pole 30, a tension spring 40, an operation member 60, and the operation shown in FIG. 1. Cables 5k, 5k.

First, the two base members 10, 10 will be described. That is, each base member 10 and 10 is formed of a metal plate-like member, and is integrally fixed to the seat cushion 3 (see FIG. 1) in a state where the plate surfaces face each other. In addition, since each base member 10 and 10 is provided with the mutually same structure, below, it demonstrates one of them.
That is, as shown in FIG. 7, the base member 10 is formed with a recess 11 that opens downward. The recess 11 is formed in a size capable of receiving the rod-like striker S therein.
Further, a stopper portion 12 is formed at the outer peripheral edge portion (the lower right portion in the drawing) of the base member 10 so as to be able to restrict its counterclockwise rotation by contact with a hook 20 described later. Yes. The stopper portion 12 is formed as a shape protruding in the thickness direction from the outer peripheral edge portion of the base member 10 toward the opposite base member 10.

Next, the hook 20 will be described. That is, the hook 20 is formed of a metal plate-like member, and is disposed between the two base members 10 and 10 described above. The hook 20 is pivotally supported with respect to the two base members 10 and 10 by a shaft member A1 integrally connected thereto. Here, the hook 20 is disposed at a position on the right side in the drawing with respect to the recess 11 formed in the base member 10.
The hook 20 is formed with a receiving port 21 that opens outward in the radial direction. The receiving port 21 is formed in a size that can receive the rod-like striker S therein. The hook 20 has one end of a tension spring 40 hooked to a hook portion 24 formed at an outer peripheral edge portion (upper portion in the drawing). The other end side of the tension spring 40 is hooked on a pole 30 described later. As a result, the hook 20 is normally urged counterclockwise in the paper plane by the urging force of the tension spring 40. And the hook 20 is always hold | maintained as the attitude | position state pressed on the stopper part 12 of the base member 10 mentioned above by this biasing.
Here, when the hook 20 is pressed against the stopper portion 12, the hook 20 is in a posture state in which the receiving port 21 is exposed in the mouth of the recess 11 of the base member 10. At this time, the hook 20 also exposes the upper jaw portion 22 that forms the upper portion of the receiving port 21 in the mouth of the recess 11. And the lower jaw part 23 which comprises the lower part of the receiving port 21 is the position state which does not inhibit the approach to the recessed part 11 of the striker S. FIG.
Further, a corner portion 25 having a shape protruding partially outward in the radial direction is formed at the outer peripheral edge portion of the hook 20, specifically, the upper portion of the upper jaw portion 22 in the drawing. As a result, a drop portion 26 having a shape in which the outer peripheral edge portion falls in a step shape in the radial direction is formed in the lower portion of the corner portion 25.

Next, the pole 30 will be described. That is, the pole 30 is formed of a metal plate-like bar member, and is disposed between the two base members 10 and 10 described above. The pole 30 is pivotally supported at the lower end portion thereof so as to be relatively rotatable with respect to the two base members 10 and 10 by a shaft member A2 integrally connected thereto. Here, the shaft member A2 is disposed in parallel with the shaft member A1 described above. Further, the pole 30 is disposed at a position on the left side in the drawing with respect to the recess 11 formed in the base member 10.
The pole 30 has the other end of the tension spring 40 hooked on a hook portion 31 formed at the upper end portion thereof. Thus, the pole 30 is urged in the clockwise rotation direction in the drawing by the urging force of the tension spring 40. In other words, the pole 30 and the hook 20 described above are urged in a direction in which the hook portions 31 and 24 formed on each of the pole 30 and the hook 20 are pulled together. Thereby, in the posture state in which the hook 20 is restricted by the stopper portion 12, the pole 30 is in a state in which the guide surface portion 32 that is the opposing surface portion is abutted by the corner portion 25 formed to protrude from the hook 20. Is held as.
Further, a claw portion 33 having a shape that partially protrudes in the clockwise direction of the pole 30 is formed on the upper portion of the guide surface portion 32 in the drawing. Here, the guide surface portion 32 is formed in a curved surface shape that smoothly protrudes clockwise in the radial direction outward of the pole 30. And the nail | claw part 33 comprises the upper end site | part of the guide surface part 32 which protrudes in this curved surface shape, and is formed in the guide surface part 32 and the continuous form.

Therefore, the hook 20 and the pole 30 configured as described above operate as follows by the movement of the striker S entering the recess 11 of the base member 10. That is, as shown by the phantom line in FIG. 7, when the striker S enters the mouth of the recess 11, the striker S comes into contact with the upper jaw portion 22 of the hook 20 exposed in the mouth.
Then, when the striker S further enters from this contacted state, the hook 20 is pressed by the movement of the striker S and rotates. Specifically, the hook 20 is pushed in the clockwise direction against the biasing force of the tension spring 40 described above. At this time, the hook 20 rotates while sliding the corner portion 25 along the guide surface portion 32 of the pole 30.
Then, when the striker S further enters and the corner portion 25 of the hook 20 gets over the guide surface portion 32, the hook 20 and the pole 30 are switched to the posture state shown in FIG. That is, first, when the corner portion 25 climbs over the guide surface portion 32, the claw portion 33 falls into the drop portion 26 due to the biasing force of the tension spring 40. When the movement to insert the striker S is stopped in this state, the hook 20 tries to rotate counterclockwise by the urging force of the tension spring 40. However, at this time, the claw portion 33 that has fallen into the drop portion 26 restricts counterclockwise rotation of the corner portion 25 by contact. Thereby, the hook 20 will be in the state by which the counterclockwise rotation was controlled.
Here, the hook 20 is in a posture in which the recess 11 is closed by turning the lower jaw part 23 to the back side (lower side in the drawing) of the striker S by the rotation until the above restriction is made. Thus, the striker S is locked in a state in which the periphery thereof is surrounded by the recessed portion 11 in which the striker S has entered and the lower jaw portion 23 that has been turned back.

Next, the operation member 60 will be described. That is, as shown in FIG. 7, the operation member 60 is formed of a metal plate-like bar member, and is disposed outside the plate surface of the one-side base member 10 illustrated by a solid line. Yes. The lower end of the operation member 60 is integrally connected to the above-described shaft member A <b> 2 and is pivotally supported relative to the base member 10. The shaft member A2 penetrates the base member 10 in the plate thickness direction and is integrally connected to the operation member 60. As a result, the operation member 60 is integrally connected to the pole 30.
One end of the operation cable 5k shown in FIG. 1 is hooked on a hook 61 formed on the upper end portion of the operation member 60. Here, the other end side of the operation cable 5k is connected to a release lever (not shown) used when the seat back 2 described above is tilted forward to the seat cushion 3 side. As a result, the operation member 60 is pulled in accordance with the operation of the release lever and rotates counterclockwise in the drawing.
Accordingly, the operation member 60 lifts the claw 33 that has fallen into the drop portion 26 of the hook 20 by the counterclockwise rotation accompanying the operation of the release lever, and releases the rotation restriction state of the hook 20. As a result, as shown in FIG. 7, the hook 20 rotates in the clockwise direction in accordance with the bias of the tension spring 40, and pushes the striker S to the outside of the recess 11 by the upper jaw portion 22. Thereby, the engagement state of the striker S with the lock device 5 is released.
The operation member 60 is released from the towed state by stopping the operation of the release lever. As a result, the lock device 5 can be engaged with the striker S by inserting the striker S into the recess 11 again.

Then, the usage method of a present Example is demonstrated.
That is, first, as shown in FIG. 1, as an initial state, the seat 1 is in a lying down posture state X1 lying on the floor F, and the lock devices 5 and 5 are engaged and locked with the strikers S and S, respectively. It is in the posture state.
Accordingly, a release lever (not shown) is operated in order to raise the seat 1 in the folded posture state and raise it forward. As a result, the seat back 2 is tilted forward toward the seat cushion 3 and the engagement lock state of the lock devices 5 and 5 with the strikers S and S is released. As a result, the seat 1 is automatically lifted forward in accordance with the urging force of the winding springs 84 and 84 assembled to the rotation mechanisms 80 and 80. At this time, the seat 1 is raised while its rotational speed is suppressed by the braking force exerted by the rotary dampers 90 and 90. Therefore, the seat 1 is raised to the standing posture state X3 while being decelerated at a moderate speed.
Then, the seat 1 raised to the standing posture state X3 performs an operation for returning the seat 1 to the lying posture state X1 on the floor F surface against the urging force of the winding springs 84, 84, and the locking devices 5, 5 By engaging with the strikers S, S, the seat 1 can be raised and returned to the original posture state biased in the turning direction. At this time, the seat 1 is brought down while the rotation speed is suppressed by the braking action force exerted by the rotary dampers 90 and 90. Therefore, it is possible to prevent a situation in which, after the locking devices 5 and 5 are engaged with the strikers S and S, the seat 1 collides excessively with the contact surface on the floor F side due to the bounce during the pushing operation. Thereby, the load applied to the weight detection sensor 7 due to the contact between the seat 1 and the contact surface on the floor F side can be reduced, and an abnormal load can be prevented from being applied to the weight detection sensor 7.

As described above, according to the rotation mechanisms 80 and 80 of the present embodiment, torque can be exerted in both directions. In particular, the rotation mechanisms 80 and 80 are relatively large by specializing in the rotation direction in which the seat 1 is brought down on the floor F surface. By providing the rotary dampers 90, 90 capable of exerting the operating force, the seat 1 is urged against the contact surface on the floor F side by the spring during the pushing operation for engaging the lock devices 5, 5 with the strikers S, S. It is possible to prevent the situation of excessive collision. Thereby, the load at the time of contact with the sheet | seat 1 and the surface by the side of the floor F when the sheet | seat 1 is brought down on the floor F surface can be reduced. Therefore, the load applied to the weight detection sensor 7 disposed on the seat 1 can be reduced. The rotary dampers 90 and 90 can also suppress the rotation speed when the seat 1 is raised from the floor F surface.
That is, the rotary dampers 90 and 90 are conventionally known, but in one rotation direction compared to a type of damper that can exert the same magnitude of braking force on bidirectional rotation. A large braking action force specialized in Therefore, by using the rotary dampers 90 and 90 capable of exerting such a large braking action force, a heavy object such as the seat 1 is rushed to the contact surface on the floor F side due to the bounce during the pushing operation. A collision can be suitably prevented.

Although the embodiment of the present invention has been described with respect to one example, the present invention can be implemented in various forms in addition to the above-described example.
For example, the sensor component disposed on the seat is not limited to the weight detection sensor, and various sensor components such as a seating sensor can be applied.
Further, the push-type locking structure is shown in which a locking device is provided on the seat side and a striker is provided on the floor side, but a striker may be provided on the seat side and a locking device may be provided on the floor side. Moreover, you may comprise so that the load at the time of the contact with the surface of the floor side may be reduced using a rotary damper with respect to the sheet | seat in which sensor components are not arrange | positioned.

It is the block diagram which represented schematic structure of the rotation mechanism of Example 1 by the side view. It is a side view showing the schematic structure of the whole sheet | seat. It is the block diagram which expanded and represented the lying posture state of the sheet | seat in FIG. FIG. 2 is an enlarged configuration diagram illustrating a state in which the sheet is raised and rotated in FIG. 1. FIG. 2 is an enlarged configuration diagram illustrating a seat upright standing posture state in FIG. 1. It is a block diagram showing the state by which the locking device and the striker were engaged and locked. It is a block diagram showing the state where the striker entered the locking device. It is a block diagram showing the outline of a rotary damper. It is a block diagram showing the state when a viscous fluid has circulated in the left direction in the drawing sheet in the cross-sectional view as seen from the IX-IX line cut plane of FIG. It is a block diagram showing the state when a viscous fluid has circulated in the right direction in the drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 3 Seat cushion 3f Lower arm 4 Reclining device 4r Central axis 4a Operation arm 4k Operation cable 5 Locking device (locking member)
5k Operation cable 6 Slide mechanism 6u Upper rail 6l Lower rail 7 Weight sensor S Strike (engaging member)
C hollow F floor 10 base member 11 recess 11i inner peripheral surface 12 stopper portion 20 hook 21 receiving port 22 upper jaw portion 23 lower jaw portion 24 hanging portion 25 corner portion 26 dropping portion 30 pole 31 hanging portion 32 guide surface portion 33 claw portion 40 tension spring 60 Operating member 61 Hanging part A1, A2 Shaft member 80 Rotating mechanism 81 Movable member 81a Hanging pin 81h Long hole 82 Fixed member 82a Hanging part 82p Stopper pin 83 Shaft member 84 Winding spring (spring member)
90 rotary damper 91 rotor 91a vane 92 damper case 92a partition wall 93 valve member o fluid passage r fluid chamber X1 lying posture state X2 mid-rotation state X3 standing posture state G1 center of gravity G2 center of gravity G3 center of gravity D1 angle D2 angle

Claims (3)

A vehicle seat turning mechanism for supporting the seat so that the seat can be turned upside down with respect to the floor of the vehicle,
A fixing member disposed integrally with the floor;
A movable member connected to the fixed member so as to be relatively rotatable and disposed integrally with the seat;
A spring member in a disposition state capable of exerting an urging force in a rotational direction in which the movable member raises the seat from the floor surface with respect to the fixed member;
The seat is provided with a lock member that can be engaged with and disengaged from the engagement member installed on the floor,
The engagement structure of the lock member and the engagement member is a push-type lock structure in which the lock member is pushed into each other by applying a pressing force that pushes the lock member into the engagement member.
The connection between the movable member and the fixed member that supports the seat so as to be able to turn up and down with respect to the floor is performed via a rotary damper using a viscous fluid,
The rotary damper is configured to generate a torque in both directions and exert a braking force in proportion to the angular velocity of the bidirectional movement in which the seat is tilted up and down. A vehicle having a braking action force acting in one rotation direction that falls on the surface is larger than a braking action force acting in another rotation direction that raises the seat from the floor surface. A mechanism for rotating the seat. The vehicle seat turning mechanism according to claim 1,
A vehicle seat rotation mechanism, wherein the seat is provided with sensor parts such as a weight detection sensor capable of detecting the weight of an occupant. A vehicle seat turning mechanism according to claim 1 or 2,
In the rotary damper, a rotor is rotatably accommodated on a central axis of a cylindrical damper case, and a viscous fluid is sealed in a fluid chamber formed in a gap between the damper case and the rotor inside the cylinder. It has a configuration filled with
The partition wall or vane that partitions the fluid chamber is formed with a fluid passage through which the viscous fluid can flow when the rotor rotates relative to the damper case, and the flow rate of the viscous fluid that passes through the fluid passage is reduced. A valve member that can be changed according to the rotation direction is provided,
The valve member acts so as to reduce the flow rate of the viscous fluid passing through the fluid passage when rotating in one direction in which the seat is brought down on the floor surface, rather than when rotating in the other direction. A vehicle seat turning mechanism characterized by the above.

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