JP5387153B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat including a folding seat back configured such that an upper half portion of a seat back can be folded forward.

Conventionally, a vehicle seat provided with a folding seat back is disclosed in, for example, Patent Document 1.
In this case, as shown in FIG. 8, the seat back frame F of the seat back B connects the lower frame 110, the upper frame 115, and both the frames 110, 115 so that they can be bent in the front-rear direction, and the connecting position. The height of the fulcrum is adjustable, and an angle adjustment mechanism 130 that adjusts the angle between the two frames 110 and 115 is configured.
In the fulcrum height adjustment mechanism 120, nuts 126 are respectively screwed to a pair of left and right screw shafts 121 that are rotatably supported by the upper member 113 and the lower member 112 and rotated by using a motor as a drive source. .
A slide connecting member 128 that coaxially connects the upper and lower frames 110 and 115 is provided at the tip of the bar 127 protruding left and right from both the nuts 126. A top plate suspension bracket 129 is fixed to the inner surfaces of the nuts 126 facing each other.
The main body portion of the slide connecting member 128 is sandwiched between the side member of the lower frame 110 and the side arm portion 115a of the upper frame 115, and is slidably engaged with the adjustment hole 115b of the side arm portion 115a in the longitudinal direction. Thus, the upper frame 115 is coupled to the lower frame 110 so as to be swingable about the central axis of the slide coupling member 128.
The swing center of the upper frame 115 relative to the lower frame 110 is adjusted by a nut 126 that moves up and down by the rotation of the screw shaft 121.
In the angle adjusting mechanism 130, a pair of left and right screw shafts 131 rotated by using a motor as a driving source are a connecting plate 116 of the upper frame 115 disposed so as to be orthogonal to the upper frame 115 and a support fixed thereto. The bracket 136 is rotatably supported.
A nut 137 to be screwed onto the screw shaft 131 is pivotally supported via a pin 139 on a support fork 138 fixed to the support plate 113b of the upper member 113. Then, by rotating both screw shafts 131 using the motor as a drive source, the nut 137 moves relatively in the axial direction of the screw shaft 131, whereby the upper frame 115 rotates in the front-rear direction around the bar 127. It has come to be adjusted.

JP 2000-23780 A

By the way, in the vehicle seat provided with the above-described conventional folding seat back, the height of the folding position (center folding position) can be adjusted by changing the height of the slide connecting member 128 by the fulcrum height adjusting mechanism 120. It is.
However, since the relative maximum movement amount (stroke) in the axial direction between the nut 137 and the screw shaft 131 of the angle adjusting mechanism 130 is constant, if the height of the middle folding position is changed, the upper frame 115 rotates. The angle also changes.
For example, when the height of the middle folding position of the upper frame 115 is lowered, the maximum rotation angle of the upper frame 115 is reduced.

  In view of the above problems, the object of the present invention is to keep the maximum rotation angle of the upper frame constant even when the height of the middle folding position of the upper frame of the seat back frame is changed. A vehicle seat is provided.

In order to solve the above-described problem, a vehicle seat according to claim 1 of the present invention is a vehicle seat including a folding seat back configured such that the upper half of the seat back can be folded forward. And
The seat back includes a cushion body covered with a seat back skin, and a seat back frame disposed on the rear side of the cushion body,
The seat back frame includes a lower portion frame having two side frame portions of the left and right, and lift base assembled to be movable up and down relative to the lower frame by the lifting drive mechanism, rotates the lower to the elevating base is the horizontal axis line With the upper frame assembled as possible,
On the inner side of the left and right side frame parts of the lower frame, while an elevating guide rail for elevating and lowering the elevating base is attached,
At both left and right ends of the lifting base, both connecting portions having both slide bodies that are fitted to the left and right lifting guide rails to move up and down are provided.
The lower part of the upper frame is connected to the two connecting parts so as to be rotatable around a horizontal axis with a connecting pin as a fulcrum,
Between the elevating base and the upper frame, a folding drive mechanism for rotating the upper frame around a horizontal axis is provided.

According to the above configuration, the upper frame is moved up and down together with the lifting base by the lifting drive mechanism, so that the height position of the upper frame and the folding height position (the height of the horizontal axis forming the rotation center of the upper frame). Position) is adjusted.
For this reason, the height position of the upper frame can be adjusted in accordance with the seat height of the seated person on which the vehicle seat is seated, and the upper back of the seated person can be favorably supported by the upper frame. .
Further, the upper half portion of the seat back is folded forward by rotating the upper frame about the horizontal axis by a folding drive mechanism disposed between the elevating base and the upper frame.
For this reason, even when the height of the folding position of the upper frame of the upper frame of the seat back frame changes, the maximum rotation angle of the upper frame can be kept constant without changing.

The vehicle seat according to claim 2 is the vehicle seat according to claim 1,
An upper back heater is installed in the upper part of the seat back.

  According to the above-described configuration, the upper frame heater can be disposed in a state of being close to the upper back of the seated person by rotating the upper frame around the horizontal axis line by the folding drive mechanism. The thermal effect of the upper back heater can be enhanced.

It is a perspective view which shows the vehicle seat which concerns on Example 1 of this invention. It is a perspective view which similarly shows the seat back frame of the vehicle seat. It is a perspective view which isolate | separates and shows each bracket of a folding drive mechanism similarly. It is a sectional side view which shows the state by which the upper frame of the seat back frame was similarly arrange | positioned in the raise position. It is a sectional side view which shows the state by which the upper frame similarly arrange | positioned in the raise position was bent forward. It is a sectional side view which shows the state by which the upper frame of the seat back frame was similarly arrange | positioned in the falling position. It is a sectional side view which shows the state by which the upper frame similarly arrange | positioned in the falling position was bent forward. It is a sectional side view which shows the conventional folding seat back of the vehicle seat.

  The best mode for carrying out the present invention will be described in accordance with an embodiment.

A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vehicle seat 1 includes a seat cushion 10 and a center folding seat back 20, and the center folding seat back (hereinafter simply referred to as a seat back) 20 is provided on the seat cushion 10. The rear part is supported by a reclining mechanism (not shown) so that the angle can be adjusted, and the upper half part can be folded forward (the angle can be adjusted in the front-rear direction).

As shown in FIGS. 2 and 4, the seat back 20 includes a cushion body 21 covered with a seat back skin 22 and a seat back frame 30 disposed on the rear side of the cushion body 21.
In addition, a plurality of concave portions 21a for facilitating the middle folding are provided in the central portion in the height direction of the cushion body 21 with a predetermined interval in the vertical direction.

  As shown in FIG. 2, the seat back frame 30 includes a lower frame 31, an elevating base 50 that can be moved up and down along the lower frame 31 by the elevating drive mechanism 40, and a lower portion around the horizontal axis about the elevating base 50. And an upper frame 55 assembled to be rotatable.

As shown in FIG. 2, the lower frame 31 includes left and right side frame portions 32 and a lower panel 33 attached across the lower portions of the both side frame portions 32.
On the inner side surfaces of both side frame portions 32, vertical guide rails 35 are attached to guide the lift base 50 up and down.
Further, of the side frame portions 32, one side frame portion 32 is provided with a lifting drive mechanism 40. The elevating drive mechanism 40 uses an elevating motor 41 as a drive source, and a drive link 43 is connected to a drive shaft 42 rotated by the elevating motor 41 so that torque can be transmitted at a base end portion thereof.
A driven link 45 connected to an elevating base 50, which will be described in detail below, is connected to the distal end of the drive link 43 by a pin 44 at one end thereof.

As shown in FIG. 2, connecting portions 51 for the upper frame 55 are formed at both left and right ends of the lifting base 50.
In addition, projecting portions 51a projecting outward in the width direction are formed at the lower ends of both connecting portions 51, and slider mounting portions 51b bent upward at a right angle are formed at the ends of these projecting portions 51a. Is formed.
A slide body 52 that is engaged with the elevation guide rail 35 and moves up and down is attached to both slider attachment portions 51b.
Further, a connecting portion 50 a connected to the other end portion of the driven link 45 by a pin 46 is formed on one side portion of the elevating base 50.

The upper frame 55 is formed by bending a metal pipe material into an inverted U shape, and in the support pieces 57 attached to the lower ends of the upper frame 55, the connection pins 53 are laterally connected to the connection portions 51 of the elevating base 50. Is attached so as to be rotatable around the horizontal axis (the central axis of the connecting pin 53).
A band plate-like intermediate panel 56 is attached to the intermediate portion in the height direction of the upper frame 55 by welding or the like at both ends thereof.

Between the elevating base 50 and the intermediate panel 56, a half-fold drive mechanism 60 that rotates the upper frame 55 around the horizontal axis about the connecting pin 53 is provided.
As shown in FIGS. 2 and 3, the middle folding drive mechanism 60 includes a middle folding drive motor 76, a housing 77 in which a ball nut is provided, and a middle folding ball screw 80. The middle folding drive motor 76 and the housing 77 are attached to the rear side of the intermediate panel 56 via a bracket 61, an intermediate bracket 65, and a swinging bracket 70.
That is, a base portion 62 forming one side of the L-shaped bracket 61 is attached to the rear side surface of the intermediate panel 56 by the bolt 64. An intermediate bracket 65 is attached to the attachment portion 63 forming the other side of the bracket 61 with bolts 64 at the upper and lower portions of the base portion 66.

As shown in FIG. 3, the intermediate bracket 65 is formed with both support portions 67 and 68 that face each other at a predetermined interval in the left-right direction, and these support portions 67 and 68 are centered on a lateral bolt 69. The swing bracket 70 is attached so as to be swingable (pivotable) in the front-rear direction.
The swing bracket 70 includes an upper plate 72 having swing connection portions 71 attached to both support portions 67 and 68 of the intermediate bracket 65 by bolts 69 on the left and right edges, and a front edge of the upper plate 72 of the upper plate 72. A front plate 73 that is bent downward at a right angle and a lower plate 74 that is bent at a right angle rearward from the lower edge of the front plate 73 in parallel with the upper plate 72 are provided.
A housing 77 in which a ball nut is provided is fitted between the upper plate 72 and the lower plate 74 of the swing bracket 70, and a plurality of positioning pins 77 a protruding from the upper surface of the housing 77 are provided on the upper plate. It is positioned and attached in a state of being inserted into the 72 positioning holes.

Further, an extension piece 75 is integrally extended from one side edge of the front plate 73, and a middle-folding drive motor 76 is attached to the extension piece 75 with a screw.
The drive shaft of the folding drive motor 76 and the ball nut in the housing 77 are connected so that torque can be transmitted by meshing the worm and the worm wheel.

As shown in FIGS. 2 and 3, the folding ball screw 80 is slidably fitted into a ball nut in the housing 77, and a connecting portion 81 at the lower end thereof is attached to the rear side of the lifting base 50. It is connected to the bracket 85 so as to be rotatable about a lateral pin 86.
Further, the upper end portion of the folding ball screw 80 protrudes upward through the ball nut, and a stopper body 83 is fitted into the upper end portion and is tightened by a tightening nut 84.

  Further, in the first embodiment, a waist heater 25 and a back upper heater 26 are provided in the lower and upper portions between the seat back skin 22 and the cushion body 21 of the seat back 20 from the electric heating seat.

The first embodiment is configured as described above.
Therefore, the height position and the folding height position of the upper frame 55 are adjusted by moving the upper frame 55 together with the lifting base 50 along the lifting guide rail 35 of the lower frame 31 by the lifting drive mechanism 40.

That is, the drive shaft 42 is rotated forward and backward by operating the lift motor 41 of the lift drive mechanism 40 by operating a switch (not shown) arranged around the vehicle seat 1 to operate the lift motor 41. . Thus, the upper frame 55 is moved up and down together with the lift base 50 while the lift base 50 is lifted and guided by the lift guide rail 35 via the drive link 43 and the driven link 45.
For this reason, the height position of the upper frame 55 can be adjusted according to the height of the seated person seated on the vehicle seat 1, and the upper back of the seated person is favorably supported by the upper frame 55. be able to.
For example, when a person with a low seating height (such as a child) is seated, as shown in FIG. The head of the seated person who has a low sitting height is not pressed by the upper frame 55 because the seat is retracted downward.

Further, as shown in FIGS. 5 and 7, the upper half portion of the seat back 20 is angle-adjusted in the front-rear direction by rotating the upper frame 55 around the horizontal axis by the folding drive mechanism 60.
That is, the middle folding drive motor 76 is operated by operating a switch (not shown) disposed around the vehicle seat 1 to operate the middle folding drive motor 76. The ball nut in the housing 77 is rotated in one direction by 76, and the ball nut and the folding ball screw 80 are relatively moved while rotating the swinging bracket 70 in one direction. 55 is rotated around the horizontal axis (the central axis of the connecting pin 53), whereby the seat back 20 is folded.
Further, the ball nut is rotated in the other direction by the folding drive motor 76, and the ball nut and the folding ball screw 80 are relatively moved while rotating the swinging bracket 70 in the other direction. The upper frame 55 is reversed around the horizontal axis (the central axis of the connecting pin 53), thereby returning the seat back 20 to its original state.

  For this reason, even when the height of the middle folding position of the upper frame 55 (the center position of the connecting pin 53) changes in height, the maximum turning angle (maximum folding angle) of the upper frame 55 remains constant without changing. Can keep.

  Further, in the first embodiment, the middle folding drive mechanism 60 causes the upper frame 55 to rotate around the horizontal axis to be folded, thereby bringing the back heater 26 of the seat back 20 closer to the upper back of the seated person. The thermal effect of the upper back heater with respect to the upper back of the seated person can be enhanced.

In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can also be implemented with a various form.
For example, the elevating drive mechanism 40 and the folding drive mechanism 60 may be configured in any manner.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 10 Seat cushion 20 Seat back 26 Back upper heater 30 Seat back frame 40 Lift drive mechanism 41 Lift motor 43 Drive link 45 Drive link 50 Lift base 55 Upper frame 60 Middle drive mechanism 61 Bracket 65 Middle bracket 70 Swing Dynamic bracket 76 Drive motor for middle break 77 Housing (Ball nut housing)
80 Ball screw for folding

Claims (2)

A vehicle seat having a folding seat back configured such that the upper half of the seat back can be folded forward,
The seat back includes a cushion body covered with a seat back skin, and a seat back frame disposed on the rear side of the cushion body,
The seat back frame includes a lower portion frame having two side frame portions of the left and right, and lift base assembled to be movable up and down relative to the lower frame by the lifting drive mechanism, rotates the lower to the elevating base is the horizontal axis line With the upper frame assembled as possible,
On the inner side of the left and right side frame parts of the lower frame, while an elevating guide rail for elevating and lowering the elevating base is attached,
At both left and right ends of the lifting base, both connecting portions having both slide bodies that are fitted to the left and right lifting guide rails to move up and down are provided.
The lower part of the upper frame is connected to the two connecting parts so as to be rotatable around a horizontal axis with a connecting pin as a fulcrum,
A vehicular seat characterized in that a folding drive mechanism for rotating the upper frame about a horizontal axis is disposed between the elevating base and the upper frame. The vehicle seat according to claim 1,
A vehicle seat characterized in that an upper back heater is installed in the upper part of the seat back.

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