JP2010285043A - Vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smooth operation of a seat surface position adjusting member, in a seat constituted so as to move a seat surface by the seat surface position adjusting member in a frontal collision, and to compactly arrange these mechanisms. <P>SOLUTION: This vehicle seat includes: a base frame 30; a movable frame 40; a driving force generating member (a second gas cylinder 61) operating in the frontal collision; a power transmission member (a second wire 62) for relatively moving the movable frame 40 to the base frame 30 by transmitting driving force of the driving force generating member between the base frame 30 and the movable frame 40; and the seat surface position adjusting member (a link 43 for a lift) having one end part rotatably connected to the movable frame 40, having the other end part rotatably connected to the base frame 30 and rotated when the movable frame 40 moves to the base frame 30. The seat surface position adjusting member is arranged between a sidewall (a side frame 31) of the base frame 30 and a sidewall (a side frame 41) of the movable frame 40. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle seat such as a vehicle seat, and more particularly to a vehicle seat having a structure in which a seating surface moves in a frontal collision.

2. Description of the Related Art There is known a vehicle seat having a configuration in which a seating surface of a seating portion moves rearward at a frontal collision such as a frontal collision of a vehicle. For example, the vehicle seat described in Patent Document 1 discloses a configuration in which a seating surface is moved rearward by a pretensioner device (gas cylinder) having an axial center directed in the left-right direction.
And the movable frame which comprises a seat surface is comprised so that a front part may be lifted upwards by an arm, if it moves back.

JP 2008-213546 A

  However, in the vehicle seat described in Patent Document 1, since the arm (seat surface position adjusting member) for moving the movable frame upward is exposed, there is a possibility of interfering with the seat cushion or the skin.

  In addition, it is desirable to arrange these mechanisms in a compact manner and to reduce the size and weight of the vehicle seat.

  Accordingly, the present invention provides a seat configured to move the seating surface by the seating surface position adjusting member at the time of a frontal collision, so that the seating surface position adjusting member can be operated smoothly, and these mechanisms are arranged in a compact manner. Objective.

  In order to solve the above-described problems, the present invention provides a vehicle seat configured such that a seating surface of a seating portion is moved at the time of a frontal collision with respect to an occupant, and the vehicle seat side of the seating portion is arranged on the vehicle body side. A base frame to be supported; a movable frame movable relative to the base frame; a driving force generating member that operates at the time of a frontal collision; and the driving force of the driving force generating member, the base frame and the movable frame A power transmission member that moves the movable frame relative to the base frame by transmitting between the first frame and one end of the power transmission member that is rotatable with respect to the movable frame, and the other end is the base frame. And a seating surface position adjusting member that is rotated when the movable frame moves with respect to the base frame, and the seating surface position adjusting member comprises: Serial, characterized in that provided between the side walls and the side walls of the movable frame of the base frame.

  According to such a configuration, the seating surface position adjusting member is arranged in a compact manner by utilizing the space between the side wall of the base frame and the side wall of the movable frame, and the seating surface position adjusting member is completely formed by these side walls. Since it is not exposed, the seat surface position adjusting member does not easily interfere with the seat cushion, and the seat surface position adjusting member can operate smoothly.

  In the above-described configuration, the power transmission member may be configured to extend in the front-rear direction between the side wall of the base frame and the side wall of the movable frame.

  In such a configuration, a large part of the power transmission member is accommodated between the side wall of the movable frame and the side wall of the base frame, and the power transmission member interferes with the seat cushion by these side walls. Since it is difficult, a power transmission member can operate | move smoothly.

  In the above-described configuration, the side wall of the movable frame has a configuration in which a portion facing the power transmission member or the seating surface position adjusting member is formed in a concave shape having an upper edge portion and a lower edge portion. Is desirable.

  If comprised in this way, while the side wall of a movable frame becomes a U-shaped cross section and becomes high rigidity, since a power transmission member or the said seat surface position adjustment member opposes the recessed part by this U-shaped cross section, power transmission A member and a seat surface position adjustment member can be arrange | positioned compactly.

  Similarly, in the configuration described above, the side wall of the base frame is configured such that a portion facing the power transmission member or the seating surface position adjusting member is formed in a concave shape having an upper edge portion and a lower edge portion. Is desirable.

  With this configuration, the side wall of the base frame has a U-shaped cross section and is highly rigid, and the power transmission member or the seating surface position adjusting member faces the recess formed by the U-shaped cross section. A member and a seat surface position adjustment member can be arrange | positioned compactly.

  According to the structure of Claim 1, while being able to arrange | position a seat surface position adjustment member compactly, operation | movement of a seat surface position adjustment member can be made smooth.

  According to the structure of Claim 2, while being able to arrange | position a power transmission member compactly, operation | movement of a power transmission member can be made smooth.

  According to the configuration of the third aspect, it is possible to increase the rigidity of the movable frame to make the operation of the movable frame smooth and to arrange the power transmission member and the seat surface position adjusting member in a compact manner.

  According to the configuration of the fourth aspect, the rigidity of the base frame is increased to make the operation of the movable frame smooth, and the power transmission member and the seating surface position adjusting member can be arranged in a compact manner.

1 is an overall perspective view of a seat frame of a vehicle seat. It is a disassembled perspective view of the seating part of a seat frame. It is a schematic diagram explaining a height adjustment mechanism, when (a) the sheet is lowered and (b) when the sheet is raised. It is ZZ sectional drawing of FIG. It is the figure which looked at the front link connection pipe and the 2nd gas cylinder from the front. It is a top view which fractures | ruptures and shows a part of seating part explaining arrangement | positioning of the link for a lift. (A) The side view of a movable frame, (b) It is XX sectional drawing of (a). It is YY sectional drawing of FIG. It is a top view explaining the positional relationship of the slider of a normal state, a base frame, and a movable frame. It is a side view explaining the positional relationship of the slider, base frame, and movable frame in a normal state. It is a top view explaining the positional relationship of the slider of a state after an operation | movement, a base frame, and a movable frame. It is a side view explaining the positional relationship of the slider of a state after an operation | movement, a base frame, and a movable frame. It is the modification which has arrange | positioned the 1st gas cylinder in the left-right reverse direction.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
A vehicle seat as an example of a vehicle seat according to the present invention is configured by covering a seat cushion made of urethane foam or the like on the outside of a seat frame 1 as shown in FIG. The seat frame 1 includes a seat back frame 2 and a seating portion frame 3. In the present invention, front and rear, left and right, and top and bottom are based on a passenger sitting on the seat.

  As shown in FIG. 2, the seating portion frame 3 includes a rail slider device 10 that fixes the seating portion to the vehicle body floor, a height adjustment mechanism 20 that changes the height of the seating surface, a base frame 30, and a movable frame 40. A pretensioner device 50 that retracts the seat belt at the time of a frontal collision and a seating surface moving device 60 that moves the movable frame 40 rearward at the time of a frontal collision are mainly provided. The movable frame 40 is configured to move rearward relative to the base frame 30 when a frontal collision occurs. A state before the operation due to the frontal collision is referred to as a normal state, and a state after the operation is referred to as a post-operation state. Hereinafter, when there is no notice in particular, the structure of a normal state is demonstrated.

  The rail slider device 10 mainly has a rail 11 and a slider 15. The rail 11 has a shape extending long in the front-rear direction, and two similar ones are provided in parallel apart from each other on the left and right. Each rail 11 is fixed to the vehicle body floor by a front bracket 12 and a rear bracket 13.

  The slider 15 has a shape that extends long in the front-rear direction, and is configured to be slidable relative to the rail 11. The slider 15 supports the base frame 30 via the height adjustment mechanism 20.

  The height adjustment mechanism 20 includes a front link 21 and a rear link 23, and lower ends 21 </ b> A and 23 </ b> A are rotatably connected to the slider 15, and upper ends 21 </ b> B and 23 </ b> B are rotatably connected to the base frame 30. Thus, the base frame 30 can be moved up and down with respect to the slider 15 by the four-bar linkage mechanism.

Specifically, two front links 21 are provided on the left and right, and lower ends 21 </ b> A are pivotally supported by metal fittings 91 provided at the front ends of the sliders 15. The left and right front links 21 are connected by a front link connecting pipe 22 as an example of a connecting member near the center of each front link 21. As a result, both the left and right front links 21 rotate simultaneously.
An upper end 21B of the front link 21 is coaxial with a dial 27 provided on a base frame 30 described later, and is supported by a pin 92 (only one is shown).
Each front link 21 is rearwardly inclined so that the upper end 21B is located behind the lower end 21A.

  The front link connecting pipe 22 is curved so that a central portion 22A occupying about 70% of its length is positioned below the both end portions 22B in a normal state.

As with the front link 21, the lower end 23 </ b> A is pivotally supported by the slider 15 via the bracket 93, and the upper end 23 </ b> B is engaged with a pin 94 that is rotatably engaged with a base frame 30 described later. Yes. Further, the rear link 23 is disposed to be inclined rearward so that the upper end 23B is located behind the lower end 23A, as with the front link 21.
The left and right rear links 23 are connected by a rear link connecting pipe 24 near the center of each rear link 23. Thereby, both the left and right rear links 23 rotate at the same time.
The rear link connecting pipe 24 is curved so that a central portion 24A occupying about 70% of its length is positioned below and behind the both end portions 24B in the normal state.

  The upper end 23B of the rear link 23 and the pin 94 are engaged so as not to rotate. The pin 94 engages with the link 25 extending upward so as not to rotate. Further, as shown in FIGS. 3A and 3B, the upper end of the link 25 is rotatably connected to an operation link 26 extending forward, and the operation link 26 rotates with respect to the base frame 30. The fan-shaped gear 28 is rotatably connected. The base frame 30 is provided with a dial 27 for rotating the gear, and the gear of the dial 27 and the fan-shaped gear 28 are engaged with each other. Accordingly, when the dial 27 is rotated, this rotation is transmitted to the rotation of the fan-shaped gear 28, and the rotation of the fan-shaped gear 28 rotates the link 25 via the operation link 26. Since the link 25 and the rear link 23 are fixed to each other by a pin 94, the movement of the link 25 is the rotation of the rear link 23. Since the rear link 23, the base frame 30 and the front link 21 constitute a four-bar linkage mechanism, when the rear link 23 rises forward, the front link 21 rises forward as well, and the base frame 30 Move upward. In this way, the base frame 30 can be adjusted in height up and down by forward and reverse rotation of the dial 27.

As shown in FIG. 2, the base frame 30 mainly includes a side frame 31 that forms left and right side walls, and a connection pipe 32 that connects the left and right side frames 31 at the front ends. A dial 27 is rotatably provided at the front end of the right side frame 31. A lower end portion (the other end portion) of a lift link 43 as an example of a seating surface position adjusting member is pivotally supported by a pin 92 on the left and right side frames 31 at a position coaxial with the dial 27. . The lift link 43 is a link that lifts the movable frame 40 when the movable frame 40 moves rearward. In a normal state, the lift link 43 is inclined forward by about 45 ° with respect to the horizontal, and the upper end (one end) is The side frame 41 of the movable frame 40 is rotatably connected by a pin 95 (see FIG. 6).
A pin 94 is rotatably engaged with the left and right side frames 31 at the rear end.

  The movable frame 40 includes a side frame 41 that forms left and right side walls, a pan frame 42 that is a cross member that connects the front ends of the left and right side frames 41, and a connection pipe 44 that connects the rear ends of the left and right side frames 41. The reinforcing pipe 45 and the mounting plate 46 are provided.

  A guide hole 41A extending in the front-rear direction is formed at the rear end of each side frame 41, and the above-described pin 94 is inserted into the guide hole 41A. Thereby, when the movable frame 40 moves rearward with respect to the base frame 30, the rear end portion of the movable frame 40 moves along the direction in which the guide hole 41A extends.

  As shown in FIG. 4, the pan frame 42 is formed by pressing a sheet metal, and has a recessed portion 42 </ b> A and a protruding protrusion 42 </ b> B that are recessed as viewed from below, in order from the rear. A hook 42H is formed on the upper surface of the portion where the concave portion 42A is located so that a part of the sheet metal is raised and the tip is directed forward. A seat spring 81 is stretched between the hook 42H and the connecting pipe 44. The front end of the seat spring 81 is located behind the upper end of the second gas cylinder 61 described later.

  As shown in FIG. 2, the connecting pipe 44 is curved so that a central portion 44A occupying about 70% of its length is positioned below the both end portions 44B. Each end portion 44B is connected to a protruding portion 41B protruding upward just above the guide hole 41A at the rear end of the side frame 41. That is, the connecting pipe 44 is located directly above the guide hole 41A. As a result, the guide hole 41A can be positioned as far back as possible, and a sufficient amount of backward movement of the movable frame 40 can be secured. Further, the central portion 44A of the connection pipe 44 needs to be arranged at a predetermined height so as not to give a sense of contact to the occupant. In the present embodiment, the connection pipe 44 has both end portions 44B at the central portion 44A. Therefore, the left and right side frames 41 can be connected to each other at a position directly above the guide hole 41A while suppressing the feeling of hitting the occupant.

  As shown in FIG. 6, the front end portions of the lift links 43 arranged on the left and right sides are rotatably supported by the left and right side frames 41 of the movable frame 40 by pins 95, and the rear end portions are bases by pins 92. The left and right side frames 31 of the frame 30 are rotatably supported. Each lift link 43 is disposed between the side frame 41 of the movable frame 40 and the side frame 31 of the base frame 30 in the left-right direction. In other words, the space between the side frame 41 and the side frame 31 is effectively arranged to be compactly arranged. Further, since the lift link 43 is sandwiched between the side frame 41 and the side frame 31, there are few exposed portions from the seat frame 1, and interference with the seat cushion and the skin covering the seat frame 1 is suppressed. The operation is smooth.

  The attachment rigidity of the pulley 63 and the lift link 43 will be described. The pulley 63 is fixed to the side frame 41 of the movable frame 40 via the attachment plate 46 as shown in FIG. As shown in FIG. 8, the side frame 41 includes a vertical portion 41R extending in the vertical direction, a flange 41P projecting outward from the upper end of the vertical portion 41R, and a flange 41Q projecting outward from the lower end of the vertical portion 41R. And has a substantially U-shaped cross section. For this reason, the side frame 41 has higher rigidity than the pan frame 42.

  The lift link 43 is connected to the link attachment portion 43A of the portion of the vertical portion 41R that bulges outward (side) above the pulley 63. Since the lift link 43 and the pulley 63 are attached to the side frame 41 having increased rigidity, the lift link 43 and the pulley 63 have high attachment rigidity.

  Further, as shown in FIGS. 7A and 7B, the outer surface of the vertical portion 41R corresponds to a concave portion 41S that is partially indented below the link mounting portion 43 in the vertical portion 41R. The reinforcing plate 65 is fixed by welding. The reinforcing plate 65 has a lower end connected to a flange 41Q that is a part of the attachment portion of the pulley 63, and an upper end connected to the upper end of the recess 41S in the vertical portion 41R. Thereby, the reinforcing plate 65 and the recessed portion 41S form a closed cross section, and the rigidity of the flange 41Q which is a part of the mounting portion is increased. Further, since the reinforcing plate 65 has a concave center at the upper edge corresponding to the bulge around the link mounting portion 43, the bulge of the side frame 41 and the reinforcing plate 65 are seamlessly connected, and the large size of the movable frame 40 is obtained. The rigidity of the link mounting portion 45 is improved while suppressing the shift.

  Further, a reinforcing rib 66 made of a thick steel plate is fixed by welding so as to pass to the inner surface of the recess 41S and the upper surface of the mounting plate 46. As a result, the angle between the mounting plate 46 and the vertical portion 41R is fixed, and the mounting portion of the pulley 63 and the link mounting portion 43A are very rigid. Further, since the left and right mounting plates 46 are connected to each other by the reinforcing pipe 45 (see FIG. 1), the mounting plate 46 and the pulley mounting portion 43A have high rigidity.

  As described above, the lift link 43 is attached to the link attachment portion 43 </ b> A which is a portion where the side frame 41 bulges and is reinforced by the reinforcement plate 65, the reinforcement rib 66, the attachment plate 46 and the reinforcement pipe 45. Therefore, it has very high mounting rigidity.

  As described above, the side frame 41 is higher in rigidity than the pan frame. In the embodiment, the side frame 41 is made of a material having a plate thickness larger than that of the pan frame 42 and high rigidity. In particular, since the side frame 41 constituting the movable frame 40 is set to have the highest rigidity among the parts constituting the movable frame 40, the mounting rigidity of the pulley 63 and the lift link 43 is ensured to be high. Has been.

  Further, since the rotation center of the pulley 63 is provided in front of the attachment center position of the link attachment portion 43A, it is easy to secure the amount of movement of the movable frame 40 to the rear, and the second wire 62 is fixed. The degree of freedom of setting the department has also increased. The link attachment portion 43A and the pulley 63 may be disposed at the same position in the front-rear direction.

  As shown in FIG. 2, the pretensioner device 50 includes a first gas cylinder 51, two first wires 52, two pulleys 53, a reinforcing pipe 54, and two pulleys 55. Yes.

  Similar to the pretensioner device of Patent Document 1, the first gas cylinder 51 protrudes in the axial direction from the cylinder 51A, a piston (not shown) that moves within the cylinder 51A, and from the piston to the outside of the cylinder 51A. It has a piston rod 51B and a gas generator 51C (see FIG. 4). The first gas cylinder 51 is arranged with its axis directed to the left and right. An acceleration sensor (not shown) is connected to the gas generator 51C. When a deceleration of the vehicle equal to or greater than a predetermined value is detected from the acceleration sensor, an electric signal is input to cause gas to flow into the cylinder 51A from the gas generator 51C. The supplied piston rod 51B enters the cylinder 51A, and the first gas cylinder 51 as a whole contracts in the axial direction. The cylinder 51 A of the first gas cylinder 51 is connected to the seat belt anchor 56 by a first wire 52, and the piston rod 51 B is connected to an inner buckle 57 by another first wire 52. Specifically, each of the two sliders 15 is provided with a pulley 53 that can rotate about an axis in the vertical direction via a bracket 58, and the two first wires 52 connected to the cylinder 51A and the piston rod 51B. After extending outward in the left-right direction, it is turned around by being wound around the pulley 53. In other words, the first gas cylinder 51 is provided in such a manner that it is stretched between two pulleys 53 provided on the slider 15 that is a portion that does not move back and forth during a frontal collision. In the present embodiment, the part that moves back and forth at the time of a frontal collision is the movable frame 40.

  Then, the pulleys 55 that can rotate around the axis in the left-right direction are respectively provided on the metal fittings 93 provided at the rear ends of the two sliders 15, and the first wire 52 facing rearward is wound around the pulley 55. The two first wires 52 are directed obliquely upward and forward, and anchors 56 and inner buckles 57 are respectively connected to the ends thereof.

  The left and right brackets 58 are connected by a reinforcing pipe 54. As a result, even if a strong tension is applied to the two first wires 52 and a force that causes the left and right pulleys 53 to approach each other is applied, the reinforcing pipe 54 stretches against this force, so that the left and right sliders The interval of 15 can be maintained appropriately.

  The seat surface moving device 60 includes a second gas cylinder 61 as an example of a driving force generating member, a second wire 62 as an example of a power transmission member, and two pulleys 63 (direction changing members). Yes. Similar to the first gas cylinder 51, the second gas cylinder 61 includes a cylinder 61A, a piston, a piston rod 61B, and a gas generator 61C (see FIG. 5). The second gas cylinder 61 is arranged with its axis directed to the left and right. That is, it is arranged in parallel with the first gas cylinder 51. The cylinder 61A is a portion that does not move through a second wire 62 at the time of a frontal collision, and is connected to a pin 94 on the left side that is located behind the second gas cylinder 61 itself. The piston rod 61 </ b> B is a portion that does not move at the time of a frontal collision via another second wire 62, and is connected to a pin 94 on the right side that is located behind the second gas cylinder 61.

  Two second wires 62 extending from the cylinder 61A and the piston rod 61B are respectively wound around two pulleys 63 provided on the outer side in the left-right direction of the second gas cylinder 61 so as to be wound around the two rear pins 94. It is stretched.

  As shown in FIG. 8, the second wire 62 directed rearward by the pulley 63 extends in the front-rear direction and is disposed between the side frame 31 of the base frame 30 and the side frame 41 of the movable frame 40. As a result, the second wire 62 extending rearward can be arranged in a compact manner, and interference between the second wire 62 and the seat cushion or the like placed on the outside of the frames can be suppressed. In particular, in the present embodiment, the second wire 62 includes flanges 31P and 31Q that extend to the inside of the upper and lower ends of the side frame 31, and flanges 41P (upper edge portions) and 41Q that extend to the outside of the upper and lower ends of the side frame 41. Since it is located in the region surrounded by (lower edge), the second wire 62 is unlikely to protrude outside the side frames 31, 41, and interference with external members is well suppressed. Further, since the side frame 41 has a U-shaped cross section, the side frame 41 has high rigidity and the operation of the movable frame 40 is stabilized.

  As shown in FIG. 4, the second gas cylinder 61 is disposed below the pan frame 42 so as to face the recess 42 </ b> A. Since the second gas cylinder 61 is arranged so as to face the recess 42A on the lower surface of the pan frame 42 in this way, even if the second gas cylinder 61 vibrates somewhat, it is difficult to interfere with the pan frame 42, and The second gas cylinder 61 is housed in a compact manner as close as possible to the pan frame 42. Particularly, since a part of the upper portion of the second gas cylinder 61 enters the recess 42A, the second gas cylinder 61 is housed in an extremely compact manner.

  As shown in FIG. 5, the second gas cylinder 61 is disposed so as to face the center portion 22 </ b> A located below in the relationship with the front link connecting pipe 22. Further, as shown in FIG. 4, the front link connecting pipe 22 is disposed above and in front of the central portion 22A. For this reason, even when the movable frame 40 moves rearward at the time of a frontal collision, the front link connecting pipe 22, the second gas cylinder 61, and the gas generator 61C protruding downward from the second gas cylinder 61 forward. Interference is suppressed.

  The positional relationship between the front link connecting pipe 22, the first gas cylinder 51, and the second gas cylinder 61 will be described. The first gas cylinder 51 is disposed behind the front link connecting pipe 22, and the second gas cylinder. 61 is arranged in front of the front link connecting pipe 22. Thereby, since three columnar members are divided and arrange | positioned before and after, the bulkiness of the height by providing these members can be suppressed.

  As shown in FIG. 2 and FIG. 9, the piston rod 51B protruding from the first gas cylinder 51 and the piston rod 61B protruding from the second gas cylinder 61 are oriented in the directions opposite to each other in the first and second directions. The gas cylinder 51 and the second gas cylinder 61 are arranged. Specifically, the first gas cylinder 51 is disposed between two pulleys 53 separated from each other on the left and right such that the cylinder 51A is closer to the right end and the piston rod 51B protrudes from the left end of the cylinder 51A toward the left. The second gas cylinder 61 is disposed between two pulleys 63 separated from each other on the left and right such that the cylinder 61A is closer to the left end and the piston rod 61B protrudes from the right end of the cylinder 61A toward the right. Accordingly, the first gas cylinder 51 and the second gas cylinder 61 are less likely to interfere with each other even when the thick cylinders 51A and 61A vibrate, and the left and right weight balance is also improved. Further, even when the first gas cylinder 51 and the second gas cylinder 61 are operated, the movements of the respective mass cancel each other, so that unnecessary force is not applied to the seating portion. In addition, since the cylinder 51A and the cylinder 61A are respectively moved toward the end portions in the left-right direction, the amount of operation of the piston rod 61B can be increased.

The operation of the vehicle seat configured as described above will be described.
As shown in FIGS. 9 and 10, in the normal state, the movable frame 40 is located at a position suitable for normal seating (position before the post-operation state) with respect to the base frame 30, and the lift link 43 is oriented upward by about 45 ° from the front. The cylinder 51 </ b> A of the first gas cylinder 51 is located at the right end between the pulleys 53, and the cylinder 61 </ b> A of the second gas cylinder 61 is located at the left end between the pulleys 63.

  9 to 12, the slider 15, the base frame 30, and the movable frame 40 are shown in an overlapping manner, and the line type is changed for each member in order to easily distinguish these. For the same reason, the first gas cylinder 51, the first wire 52, the pulley 53, the second gas cylinder 61, the second wire 62, and the pulley 63 are also represented by solid lines.

  If a large deceleration greater than a predetermined value occurs when the vehicle collides with the front, a signal is output from an acceleration sensor (not shown) to operate the gas generators 51C and 61C. As a result, the first gas cylinder 51 and the second gas cylinder 61 contract and pull the first wire 52 and the second wire 62.

As shown in FIGS. 11 and 12, when the cylinders 51A and 61A and the piston rods 51B and 61B move and the first wire 52 is pulled, the anchor 56 and the inner buckle 57 connected to the first wire 52 are drawn. Is drawn. As a result, the waist portion of the seat belt is tightened, and the occupant is prevented from separating from the vehicle seat.
When the second wire 62 is pulled, the pin 94 connected to the second wire 62 tries to be attracted to the movable frame 40, so that the movable frame 40 moves backward relative to the base frame 30 by this force. To do. At this time, the rear end portion of the movable frame 40 moves so that the guide hole 41 </ b> A follows the pin 94. And since the front part of the movable frame 40 is supported by the base frame 30 by the lift link 43, as the movable frame 40 moves rearward, the lift link 43 turns rearward so that its tip is moved. Ascending upward, the front portion of the movable frame 40 is lifted in the same manner as the movement trajectory of the tip of the lift link 43. As a result, the seat surface on the cushion (not shown) moves backward while the front portion rises, and the seat surface can easily receive the occupant trying to move forward due to inertia, making the occupant difficult to separate from the vehicle seat. .

In the vehicle seat of the present embodiment as described above, the following effects can be obtained.
The lift link 43 is compactly arranged using the space between the side frame 31 and the side frame 41, and the lift link 43 is not completely exposed by the side frames 31, 41, so the lift link 43 can operate smoothly without interfering with the seat cushion.

  Since many portions of the second wire 62 are accommodated between the side frame 31 and the side frame 41, the second wire 62 can be compactly arranged using the vacant space and is surrounded by the side frames 31, 41. Since the wire 62 does not easily interfere with the seat cushion or the skin, the second wire 62 can operate smoothly.

  Since the side frame 41 of the movable frame 40 has flanges 41P and 41Q and is formed in a U-shaped cross section, the rigidity is high, and the second wire 62 faces the recess of the side frame 41. The second wire 62 can be arranged in a compact manner.

  Since the side frame 31 of the base frame 30 has flanges 31P and 31Q and is formed in a U-shaped cross section, the rigidity is high, and the second wire 62 faces the recess of the side frame 31. The second wire 62 can be arranged in a compact manner.

  Since the second gas cylinder 61 for moving the seat surface rearward from the first gas cylinder 51 for retracting the seat belt at the time of a frontal collision is disposed above, the first wire 52 and the second wire 62 It is easy to handle and the two gas cylinders 51 and 61 can be arranged compactly.

  And among the seating parts, the second gas cylinder 61 is arranged using the space in front of the upper part, and the first gas cylinder 51 arranged behind the second gas cylinder 61 is relatively By setting it to a low position, it is possible to ensure a large space for the cushion stroke that is required particularly in the rear portion of the seating portion, that is, a space for bending the seat spring 81 downward.

  Further, when the front part of the movable frame 40 rises upward at the time of a frontal collision, it becomes difficult for the occupant to be displaced with respect to the seating part, the vehicle seat can easily hold the occupant, and the second provided on the movable frame 40. The first gas cylinder 51 and the second gas cylinder 61 are unlikely to interfere with each other because the gas cylinder 61 moves upward while moving upward. Therefore, the first gas cylinder 51 and the second gas cylinder 61 can be arranged relatively close to each other, and these can be arranged compactly.

  And the 1st gas cylinder 51 and the 2nd gas cylinder 61 are distributed back and forth with respect to the front link connection pipe 22 which connects the right and left front links 21, and the height of the height by arranging these is increased. Can be suppressed.

  Since the front link connecting pipe 22 is curved so that the central portion 22A is positioned below the both end portions 22B, interference between the front link connecting pipe 22 and the second gas cylinder 61 can be avoided. The connecting pipe 22 and the second gas cylinder 61 can be arranged in a compact manner.

  The interference between the cylinders 51A and 61A of the two gas cylinders is suppressed, and the movement of the mass due to the movement of the two cylinders 51A and 61A at the time of a frontal collision is opposite to each other on the left and right. There is nothing.

  Since the cylinders 51A and 61A are arranged close to either one of the left and right ends, the operation amount of the piston rods 51B and 61B can be secured large, and each cylinder 51A suspended by the first wire 52 or the second wire 62 can be secured. The amplitude of the vibration of 61A can be kept small.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below.

  For example, in the above-described embodiment, the cylinder 51A of the first gas cylinder 51 is arranged on the right, but this is reversed, and the cylinder 51A is arranged on the left as shown in FIG. 13 and connected to the cylinder 51A. The first wire 52 thus connected can be connected to the inner buckle 57, and the first wire 52 connected to the piston rod 51B can be connected to the anchor 56. In this way, the inner buckle 57, which is connected to the seat belt from the shoulder and the seat belt at the waist and is difficult to retract, is connected to the cylinder 51A with a small operation amount, and the anchor 56 that is easy to retract is connected to the piston rod 51B with a large operation amount. Since it was connected to, the part hung over the waist | hip | lumbar part of a seatbelt can be tightened effectively.

  In the embodiment, the second gas cylinder 61 is provided on the movable frame 40, but may be provided on the base frame 30. In this case, one end and the other end of the second wire 62 extending from the second gas cylinder 61 may be connected to any location of the movable frame 40.

  In the embodiment, the first wire 52 extending from both ends (the cylinder 51A and the piston rod 51B) of the first gas cylinder 51 is connected to the end portions (anchor 56 and inner buckle 57) of the seat belt. It is not limited, It is good also as a structure which connects the 1st wire 52 in the middle of a seatbelt, and pulls the middle of a seatbelt when the 1st gas cylinder 51 act | operates.

  In the said embodiment, although the axis line of the gas cylinders 51 and 61 was arrange | positioned toward right and left, it is not limited to this, For example, you may arrange | position an axis line toward front and back. Further, the directions in which the axes of the two gas cylinders 51 and 61 are directed may be different.

  In the above embodiment, the gas cylinder is exemplified as the driving force generating member, but the present invention is not limited to this, and for example, a spring or a motor may be used.

  In the said embodiment, although the wire was illustrated as a power transmission member, it is not limited to this, For example, a chain, a rod, etc. may be sufficient.

  In the above-described embodiment, the rotatable pulley is exemplified as the member that changes the direction of action of the force of the first wire 52 and the second wire 62. However, the present invention is not limited to this. For example, a wire or the like is wound. It may be a non-rotating member having a cylindrical surface, or may be a cylindrical member through which a wire or the like passes.

  In the above embodiment, the cylindrical pipe is exemplified as the member for connecting the left and right side frames and links. However, the member for connecting the left and right members is not limited to this, and for example, a cylindrical or prismatic connection. It may be a member.

  In the above-described embodiment, the movable frame (the seating surface of the seating portion) is moved rearward at the time of a frontal collision, but the moving direction is not limited to the rearward. For example, the front portion of the seating portion is lifted at the time of a frontal collision. Or the rear part of the seating part may be lowered.

  In the above-described embodiment, the movable frame 40 is moved and the base frame 30 is not moved at the time of a frontal collision. However, the present invention is not limited to this, and the base frame may be slightly moved relative to the airframe at the time of a frontal collision. Good.

  In the above-described embodiment, the vehicle seat is shown as an application example of the vehicle seat. However, the vehicle seat of the present invention can be applied to other vehicle seats, for example, a ship seat or an aircraft seat. In the present invention, “front” is based on the passenger sitting on the seat. Therefore, when the seat (occupant sitting on the seat) faces rearward with respect to the traveling direction of the vehicle, the rearward in the traveling direction is forward with respect to the occupant, for example, when the vehicle is bumped from the rear. It becomes a collision.

  Further, as the driving force generating member, a gas cylinder that extends outward in the left-right direction at the time of a frontal collision may be adopted. In this case, a swinging member that swings by being pushed outward in the left-right direction by the cylinder or rod of the gas cylinder and that pushes the rod as the power transmission member in the front-rear direction may be adopted as the direction changing member. Good. Further, as the direction changing member in this case, a wedge-shaped cam member pushed outward in the left-right direction by the gas cylinder and a member pushed in the front-rear direction by the inclined surface of the cam member may be adopted.

DESCRIPTION OF SYMBOLS 1 Seat frame 2 Seat back frame 3 Seating part frame 10 Rail slider apparatus 11 Rail 15 Slider 20 Height adjustment mechanism 21 Front link 22 Front link connection pipe 22A Center part 22B Both ends 23 Rear link 24 Rear link connection pipe 30 Base frame 31 Side Frame 31P Flange 31Q Flange 32 Connecting pipe 40 Movable frame 41 Side frame 41A Guide hole 41B Protruding part 41P Flange 41Q Flange 42 Pan frame 42A Recess 43 Lift link 45 Reinforcement pipe 45A Central part 45B Both ends 46 Mounting plate 50 Pretensioner device 51 First gas cylinder 51A Cylinder 51B Piston rod 51C Gas generator 52 First wire 56 Anchor 57 Inner buckle 60 Seating surface moving device 61 Second gas cylinder 61A Cylinder 61B Piston rod 61C Gas generator 62 Second wire 63 Pulley

Claims (4)

A vehicle seat configured such that a seating surface of a seating portion moves during a frontal collision with respect to an occupant,
A base frame supported on the vehicle body side of the seating portion;
A movable frame movable relative to the base frame;
A driving force generating member that operates in a frontal collision,
A power transmission member that moves the movable frame relative to the base frame by transmitting the driving force of the driving force generating member between the base frame and the movable frame;
One end portion is rotatably connected to the movable frame, the other end portion is rotatably connected to the base frame, and the seat surface is rotated when the movable frame moves relative to the base frame. A position adjustment member,
The vehicle seat according to claim 1, wherein the seating surface position adjusting member is provided between a side wall of the base frame and a side wall of the movable frame.   The vehicle seat according to claim 1, wherein the power transmission member is disposed to extend in the front-rear direction between a side wall of the base frame and a side wall of the movable frame.   The side wall of the movable frame is formed in a concave shape with a portion facing the power transmission member or the seating surface position adjusting member having an upper edge portion and a lower edge portion. Item 3. The vehicle seat according to Item 2.   The side wall of the base frame has a concave portion with an upper edge portion and a lower edge portion at a portion facing the power transmission member or the seating surface position adjusting member. Item 4. The vehicle seat according to any one of Item 3.

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