JP6860795B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat, and more particularly to a vehicle seat provided with a reclining device that rotatably connects the seat back to the seat cushion.

Conventionally, in a vehicle seat equipped with a reclining device, the shape and arrangement of a connecting bracket that connects the rear end portion of the seat cushion and the lower end portion of the seat back are arranged for the purpose of ensuring the frame rigidity around the device. Something that has been devised is known (see, for example, Patent Document 1).

The vehicle seat with a reclining device described in Patent Document 1 is provided with a plate-shaped base bracket in which one end is attached to the outer surface of the seat back in the seat width direction and the other end is attached to the outer surface of the seat cushion. Has been done.
More specifically, one end of the base bracket is attached to the outer surface of the reclining provided on the outer surface of the seat back, and the other end is bolted to the outer surface of the seat cushion. A flange protruding outward in the seat width direction is formed on the outer peripheral portion of the base bracket over the entire circumference.
The base bracket protects the reclining device, which is the main body of the reclining device, from the outside, and also secures the frame rigidity around the device for the time being.

Japanese Unexamined Patent Publication No. 2012-240427

By the way, in the vehicle seat, when the seated person is seated, a relatively large seating load is applied to the connecting portion connecting the seat cushion and the seat back, so that the frame rigidity of the connecting portion is improved. Is required.
In particular, in a vehicle seat with a reclining device as in Patent Document 1, a large load is applied to the peripheral portion (connecting portion) of the reclining device as the seat back rotates, so that a device for further improving the frame rigidity is required. Was being done.

In addition, for vehicle seats with a reclining device, in order to make the seat compact in the seat width direction, the design and development of the reclining device components so that they do not overhang from the seat back or seat cushion to the outside in the seat width direction. Was sought.
Therefore, there has been a demand for a technique capable of making the seat compact, specifically, suppressing the device from protruding outward in the seat width direction, while ensuring the frame rigidity around the reclining device.

Further, in a vehicle seat equipped with a reclining device, the device is composed of a plurality of component parts, and the assembling work is relatively complicated. Therefore, it is necessary to devise a method for improving the efficiency of the assembling work and reducing the cost. ..

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat capable of improving the frame rigidity of a connecting portion connecting a seat cushion and a seat back. It is in.
In particular, in a seat with a reclining device, it is an object of the present invention to provide a vehicle seat capable of improving the frame rigidity around the device.
Another object of the present invention is to provide a vehicle seat in which the seat is made compact, particularly in the seat with a reclining device, the periphery of the device is made compact.
Another object of the present invention is to provide a vehicle seat in which the assembling work is made more efficient, particularly in a seat with a reclining device, in which the assembling work of the device is made more efficient.

According to the vehicle seat of the present invention, the subject is a cushion frame serving as a skeleton of a seating portion, a back frame serving as a skeleton of a backrest portion, a seat rear portion of the cushion frame, and a lower portion of the back frame. The back frame includes a connecting bracket for connecting, the back frame has a back side frame forming a side in the seat width direction, and the cushion frame has a cushion side frame forming a side in the seat width direction. One end side of the connecting bracket is attached to the outer surface of the back side frame in the seat width direction, and the other end side is attached to the side surface of the cushion side frame in the seat width direction. A reclining device for rotatably connecting the back frame is provided, and the reclining device urges the back frame along the rotation direction with the rotation axis serving as the rotation center of the back frame and the rotation axis as the center. The force spring, a spring locking bracket attached to the outer surface of the back frame and for locking one end side of the urging spring, and the back attached to the outer surface of the back side frame. It has a reclining unit that regulates the rotation of the frame, and the spring locking bracket and the reclining unit are sandwiched between the backside frame and the connecting bracket in the seat width direction, and the backside frame A first shaft hole for inserting the rotating shaft is formed on the side surface, and a second shaft hole for inserting the rotating shaft is formed on the side surface of the spring locking bracket. The problem is solved by the fact that the shaft hole 1 is formed larger than the second shaft hole.
As described above, the connecting bracket can improve the flexural rigidity and the torsional rigidity of the bent portion as compared with the plate-shaped one of the conventional example.
Further, for example, when one end side of the connecting bracket is attached to the outer surface of the back side frame and the other end side is attached to the inner side surface of the cushion side frame, the connecting bracket projects outward in the seat width direction of the cushion side frame. It becomes a compact arrangement without any need.
That is, it is possible to realize a vehicle seat in which the seat is made compact while improving the frame rigidity of the connecting portion connecting the seat cushion and the seat back.
Further, with the above configuration, since the connecting bracket is assembled so as to cover the reclining unit, which is a main component of the reclining device, from the outside, the frame rigidity around the reclining device can be improved and the compactness around the device can be achieved. .. In addition, the contact portion of the connecting bracket becomes stronger.

At this time, the connecting bracket is provided with a contact portion that comes into contact with the spring locking bracket when the backside frame rotates, and the contact portion is closer to the front side of the seat than the spring locking bracket. The back side frame is arranged so as to come into contact with the protruding portion of the spring locking bracket when the back side frame is rotated toward the front side of the seat. The connecting bracket has a stepped shape, and the connecting bracket has a stepped shape. The portion where the step is formed is arranged on the front side of the seat with respect to the contact portion, and is arranged on the extension line in the rotation direction when the protruding portion of the spring locking bracket is rotated toward the front side of the seat. Is good.
With the above configuration, since the connecting bracket has a stepped shape, it is possible to improve the bending rigidity and the torsional rigidity of the bent portion as compared with the plate-shaped one of the conventional example.

At this time, the connecting bracket has a first side wall portion attached to the outer surface of the back side frame, a second side wall portion attached to the side surface of the cushion side frame, the first side wall portion, and the second side wall portion. A reinforcing bead extending in a direction intersecting the extending direction of the connecting wall portion is formed in the connecting wall portion, and the reinforcing bead is formed in the connecting wall portion. It is preferable that the portion extending from the portion connected to the first side wall portion to the portion connected to the second side wall portion is arranged outside the connecting wall portion in the seat width direction .

At this time, the connecting bracket includes an outer wall portion attached to the outer surface of the back side frame and an inner side wall portion attached to the cushion side frame and arranged inside the outer wall portion in the seat width direction. The outer wall portion and the connecting wall portion connecting the inner side wall portion are provided, and the connecting wall portion is provided so as to cover the reclining unit from the outside and the lower side in the seat width direction, and has a protruding portion. It is preferable that the spring locking bracket is provided so as to cover the reclining unit from the inside and above in the seat width direction .
With the above configuration, one end of the connecting bracket is attached to the outer surface of the back side frame, the other end extends continuously from one end to the cushion side frame, and the other end is attached to the cushion side frame. Can be improved and interference with other components can be suppressed on the outer surface of the cushion side frame.

At this time, it is preferable that the inner side wall portion is formed with a protruding portion protruding from the side surface of the inner side wall portion toward one side in the seat width direction .

At this time, the reclining unit is arranged between the outer wall portion and the inner side wall portion in the seat width direction, and the connecting wall portion is arranged at a position outside the outer peripheral surface of the reclining unit. Moreover, it is preferable that the rotating shaft is arranged between the rotating shaft and the mounting member for mounting the inner side wall portion on the cushion side frame in the front-rear direction of the seat .
With the above-mentioned configuration of the connecting bracket, the protection of the reclining unit can be ensured, and the frame rigidity around the reclining unit, which requires relatively high rigidity, can be improved.

At this time, the mounting member is a fastening member, and through holes for fastening the fastening member are formed in the inner side wall portion and the cushion side frame, respectively, and the penetration of the inner side wall portion. It is preferable that the peripheral edge portion of the hole protrudes toward one side in the sheet width direction.
With the above configuration, the rigidity of assembling the connecting bracket with the cushion side frame is further improved.
Further, in general, the connecting bracket is fixed to the cushion side frame by using a fastening bolt and a fastening nut, but in this configuration, the fastening nut can be eliminated.
Specifically, of the connecting bracket, a protruding portion of the peripheral edge of the through hole can be used instead of the fastening nut, and the protruding portion and the fastening bolt can be welded and joined.
By doing so, it is possible to realize a vehicle seat that has improved the efficiency of the assembly work of the connecting bracket (no need for welding nuts, reduction of the number of parts, shortening of the work process).

At this time, the vertical end portion of the cushion side frame, formed upper flange and lower flange projecting inwardly of the seat width direction, the peripheral edge portion of the through hole, toward the inside in the sheet width direction It is preferable that it protrudes and at least a part of it is covered from above and below by the upper end flange and the lower end flange.
With the above configuration, not only the frame rigidity of the cushion side frame is improved, but also the portion of the connecting bracket attached to the cushion side frame is covered with the flange and protected from the outside.

According to the present invention, as compared with the consolidated bracket in the conventional example, the connecting bracket with improved flexural rigidity and torsional rigidity.
Further, when the step-shaped connecting bracket is attached to, for example, one end side on the outer surface of the back side frame and the other end side is attached to the inner side surface of the cushion side frame, it is outside in the seat width direction of the cushion side frame. It is a compact layout without overhanging.
Further , according to the present invention, the assembly rigidity of the connecting bracket is improved, and interference with other components on the outer surface of the cushion side frame can be suppressed.
Further, according to the present invention, it is possible to improve the frame rigidity around the reclining device and to achieve compactness around the device.
Further, according to the present invention, it is possible to secure the protection property of the reclining unit and improve the frame rigidity around the reclining unit, which requires relatively high rigidity.
Further, according to the present invention, the mounting rigidity of the connecting bracket is further improved.
Further, according to the present invention, the rigidity of assembling the connecting bracket with the cushion side frame is further improved. In addition, it is possible to realize a vehicle seat that improves the efficiency of the assembly work of the connecting bracket (no need for welding nuts, reduction of the number of parts, shortening of the work process).
Further, according to the present invention, not only the frame rigidity of the cushion side frame is improved, but also the portion of the connecting bracket attached to the cushion side frame is protected from the outside.

It is a perspective view of the vehicle seat which concerns on this embodiment. It is a perspective view of the seat frame which becomes the skeleton of a vehicle seat. It is an enlarged view of the main part of FIG. 2, and is the perspective view which shows the periphery of the reclining apparatus. It is an exploded perspective view of a reclining device and a connecting bracket. It is a perspective view when the periphery of a reclining device is seen from another angle. FIG. 5 is a sectional view taken along line VI-VI of FIG. 5 for explaining an assembled state of the cushion side frame and the connecting bracket.

Hereinafter, the vehicle seat according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6.
The present embodiment is a vehicle seat provided with a reclining device, and includes a connecting bracket for connecting the back side frame and the cushion side frame. The connecting bracket has one end side on the outer surface of the back side frame in the front-rear direction of the seat. The present invention relates to a vehicle seat, which is attached to an outer surface of a reclining unit, and the other end side is attached so as to wrap around an inner surface of a cushion side frame.
The side on which the seated person sits with respect to the seat back of the vehicle seat is the front side of the seat.

As shown in FIG. 1, the vehicle seat S of the present embodiment is connected to a seat body including a seat cushion 1 and a seat back 2 so that the seat body can be raised and lowered with respect to the vehicle body floor as shown in FIG. The height link device 30 is mainly composed of a reclining device 40 that rotatably connects the seat back 2 to the seat cushion 1, and a connecting bracket 50 that connects the seat cushion 1 and the seat back 2. ..

As shown in FIG. 1, the seat cushion 1 is a seating portion that supports the occupant from below, and the cushion pad 1a is placed on the cushion frame 10 shown in FIG. 2 which is a skeleton and is covered with the skin material 1b. It is configured.
The seat back 2 is a backrest portion that supports the back of the occupant from behind, and is configured by placing the cushion pad 2a on the back frame 20 shown in FIG. 2 which is the skeleton and covering it with the skin material 2b.
The cushion frame 10 and the back frame 20 are connected by a connecting bracket 50.

As shown in FIG. 2, the cushion frame 10 is formed of a substantially rectangular frame-like body that serves as a skeleton of the seat cushion 1, and has a cushion side frame 11 arranged on the left and right sides and a front portion of each cushion side frame 11. A plate-shaped pan frame 12 for connecting the two cushions, a pipe-shaped rear connecting frame 13 for connecting the rear portions of the cushion side frames 11, and the pan frame 12 and the rear connecting frame 13 are hooked to each other and extend in a serpentine shape. It is mainly composed of three elastic springs 14.

The cushion side frame 11 is a sheet metal member extending in the front-rear direction of the seat and having a substantially U-shaped vertical cross section, and a reclining device 40 is attached to a rear portion thereof via a connecting bracket 50, and a reclining device 40 is attached to a lower portion thereof. A known rail device is attached via the height link device 30.
The upper end flange 11a and the lower end flange 11b are formed on the upper end portion and the lower end portion of the cushion side frame 11 so as to bend and project inward in the seat width direction, respectively.
As shown in FIG. 2, the upper end flange 11a and the lower end flange 11b extend from the position where the reclining device 40 is attached to the cushion side frame 11 to the position where the pan frame 12 is attached in the front-rear direction of the seat.

As shown in FIG. 2, the back frame 20 is composed of a substantially rectangular frame body serving as a skeleton of the seat back 2, and has a substantially inverted U-shaped upper frame 21 extending along the seat width direction and an upper frame 21 of the upper frame 21. A backside frame 22 having a substantially U-shaped cross section extending downward from both ends in the seat width direction and extending along the vertical direction, and a substantially plate-shaped lower frame 23 connecting the lower ends of the left and right backside frames 22. It is mainly composed of two elastic springs 24 that are hooked on the left and right backside frames 22 and extend in a serpentine shape.
The back side frame 22 is a sheet metal member extending in the vertical direction and having a substantially U-shaped cross section, and its lower end portion is connected to the rear end portion of the cushion side frame 11 via a reclining device 40 and a connecting bracket 50. Has been done. In such a state, the back frame 20 can rotate relative to the cushion frame 10.

As shown in FIG. 2, the height link device 30 is attached between the cushion frame 10 and a known rail device, and has left and right first links 31 arranged on the front side of the seat and left and right arranged on the rear side of the seat. The device is provided with the second link 32 of the above, and the height of the seat body can be adjusted by using the second link 32 as a drive link.
As shown in FIG. 5, a sector gear portion 32a is formed as a gear on a part of the outer peripheral portion of the connecting portion of the second link 32 on the cushion side frame 11 side, and the brake unit 34 described later. It is meshed with a pinion gear (not shown) provided inside.

Further, as shown in FIG. 2, the height link device 30 is pivotally supported on the side surface of the cushion side frame 11 in the seat width direction, and can rotate via the brake rotation shaft 33 protruding outward and the brake rotation shaft 33. A brake unit 34 that is attached to the seat body to regulate the raising and lowering operation of the seat body, and a height operating lever 35 that is rotatably attached via the brake rotation shaft 33 and the brake unit 34 to raise and lower the seat body. There is.
When the height operating lever 35 is operated, the pinion gear rotates integrally with the brake rotating shaft 33, and the meshing position between the pinion gear and the sector gear portion 32a changes. Further, the second link 32 on the left side on which the sector gear portion 32a is formed rotates, and the second link 32 on the right side and the first links 31 on the left and right also rotate in accordance with the second link 32 on the left side. As a result, the seat body moves up and down, and the seat height is adjusted.

As shown in FIGS. 2 to 4, the reclining device 40 includes a device that rotatably connects the back frame 20 to the cushion frame 10.
The reclining device 40 has a reclining unit 41 that regulates the rotation of the back frame 20, and a rotation that is axially supported by the lower end portion of the back frame 20 in the seat width direction and protrudes from the outer surface of the back frame 20 and is connected to the reclining unit 41. It is mainly composed of a shaft 42 and a spiral spring 43 that is attached to the outside of the reclining unit 41 in the seat width direction and urges the back frame 20 to rotate toward the cushion frame 10 about the rotating shaft 42. There is.

The reclining unit 41 can switch the state of the back frame 20 between a locked state fixed to the cushion frame 10 and an unlocked state in which it can rotate relative to each other.
In the reclining unit 41, the state of the back frame 20 is normally locked, and when the operating lever 46 shown in FIG. 2 is operated, the rotating shaft 42 is rotated by the operation, and the reclining unit 41 is unlocked. It is configured to switch to.
Then, while the state of the back frame 20 is in the unlocked state, the occupant can tilt the seat back 2 backward, and when the operation lever 46 is released when the backward tilt angle reaches a desired angle, the seat back 2 is in the locked state. It is configured to return.

The rotating shaft 42 is arranged between the left and right cushion side frames 11 in a state where the axial direction is along the seat width direction, and the extending end portion of the rotating shaft 42 is a shaft formed on the side surface of the back side frame 22. It projects outward in the seat width direction through the hole 22a.
The protruding end of the rotating shaft 42 is assembled to the reclining unit 41 via a spring locking bracket 44, which will be described later, and is further assembled to the operating lever 46 shown in FIG. 2 located outside the reclining unit 41. Has been done.

The spiral spring 43 is urged to rotate the back frame 20 around the rotation shaft 42 in a cushion frame when the back frame 20 is in the unlocked state and the back frame 20 is in the backward tilted state. To do.
As shown in FIG. 4, the spiral spring 43 has one end 43a hooked on the protruding portion of the spring locking bracket 44 on the back side frame 22 side, and the other end 43b is a spring on the cushion frame 10 side. It is hooked on the protruding portion of the locking bracket 45.

As shown in FIGS. 3 to 5, the connecting bracket 50 is made of a stepped metal plate that connects the back frame 20 and the cushion frame 10, and its rear portion is attached to the outer surface of the back side frame 22 and is in front of the back frame 50. A portion is attached so as to wrap around the inner surface of the cushion side frame 11.
Specifically, as shown in FIG. 4, the connecting bracket 50 has an outer wall portion 51 that fits on the outer surface of the reclining unit 41 attached to the back side frame 22, and a seat width direction with respect to the outer wall portion 51. The inner side wall portion 52, which is arranged inside the cushion side frame 11 and is bolted to the inner side surface of the cushion side frame 11, and the connecting wall portion 53 connecting the outer wall portion 51 and the inner side wall portion 52 are mainly composed of the inner side wall portion 52.
The connecting bracket 50 is formed to be thicker than the back side frame 22 and the cushion side frame 11.

As shown in FIG. 4, the side surface of the outer side wall portion 51 is provided with a shaft hole 51a for inserting the rotating shaft 42 and a shaft hole 51a surrounding the shaft hole 51a so as to be fitted to the reclining unit 41. Fitting holes 51b and are formed.
Further, contact portions 51c and 51d that can come into contact with the protruding portion of the spring locking bracket 44 are formed at the upper end portion of the outer peripheral portion of the outer wall portion 51. The contact portions 51c and 51d are stopper portions of the spring locking bracket 44 that can rotate integrally with the back frame 20.
A spring locking bracket 45 is joined to the peripheral edge of the shaft hole 51a on the outer surface of the outer side wall portion 51 by welding.

As shown in FIGS. 4 and 5, through holes 52a and 52b for fastening the fastening member 54 are formed on the side surface of the inner side wall portion 52, and the through holes 52a and 52b are cushion side frames, respectively. It is arranged so as to communicate with the through holes 11c and 11d formed on the side surface of the rear end portion of 11.
Of the inner side wall portions 52, the peripheral edges of the through holes 52a and 52b project so as to project inward in the seat width direction as shown in FIGS. 5 and 6, and the projecting peripheral edges project with the fastening member 54. It has been concluded.
Of the cushion side frame 11, the peripheral edges of the through holes 11c and 11d project so as to project outward in the seat width direction, and similarly, the projecting peripheral edges are fastened to the fastening member 54. ..

Of the outer peripheral portion of the inner side wall portion 52, a notch portion 52c notched toward the side opposite to the rear connecting frame 13 side is formed in a portion close to the rear connecting frame 13.
The cutout portion 52c is cut out in a substantially triangular shape, and is arranged so as to be sandwiched between the through hole 52a and the through hole 52b in which the two fastening members 54 are fastened.

As shown in FIGS. 4 and 5, the connecting wall portion 53 is a portion that connects the front end portion of the outer wall portion 51 and the weather end portion of the inner side wall portion 52, and is a portion that connects the back side frame 22 and the cushion side frame. It is arranged so as to enter between the eleven.
Further, the connecting wall portion 53 is provided at a position facing the reclining unit 41 in the front-rear direction of the seat, and is bent along the outer peripheral portion of the reclining unit 41.
As shown in FIG. 4, the connecting wall portion 53 is formed with a reinforcing bead 53a extending from a portion connected to the outer wall portion 51 to a portion connected to the inner side wall portion 52.

In the above configuration, as shown in FIGS. 3 to 5, the reclining unit 41 is arranged between the outer wall portion 51 and the inner side wall portion 52 in the seat width direction in the connecting bracket 50.
Further, the reclining unit 41 is arranged at a position surrounded by the outer wall portion 51, the connecting wall portion 53, and the back side frame 22 (spring locking bracket 44).
In this way, the connecting bracket 50 is assembled so as to protect the reclining unit 41, which is a main component of the reclining device 40, from the outside, so that the frame rigidity around the reclining device 40 (reclining unit 41) can be improved.

Further, in the above configuration, as shown in FIG. 5, the through holes 52a and 52b of the inner side wall portion 52 are the rear connecting frame in the direction orthogonal to the direction from the reclining unit 41 side to the rear connecting frame 13 side in the connecting bracket 50. It is arranged at a position sandwiching 13 in between.
In this way, when the connecting bracket 50 is attached to the inner surface of the cushion side frame 11 by the fastening member 54, the two fastening members 54 are arranged so as to sandwich the portion of the cushion side frame 11 having a relatively high rigidity. Therefore, the mounting rigidity of the connecting bracket 50 is improved.

Further, in the above configuration, as shown in FIGS. 5 and 6, the peripheral edge portions of the through holes 52a and 52b of the inner side wall portions 52 project inward in the seat width direction, and the protruding peripheral edge portions project to the fastening member 54. Has been concluded with.
Generally, the connecting bracket 50 is fixed to the cushion side frame 11 by using a fastening bolt and a fastening nut. However, in this configuration, the fastening nut can be eliminated.
Specifically, of the connecting bracket 50, the peripheral portion of the through holes 52a and 52b that protrudes can be used instead of the fastening nut, and the protruding portion and the fastening member 54 are welded together. be able to.
Therefore, when assembling the connecting bracket 50, it is possible to eliminate the need for welding nuts, reduce the number of parts, shorten the work process, and improve the assembling rigidity.

Further, in the above configuration, as shown in FIGS. 5 and 6, the peripheral portions of the through holes 52a and 52b and the protruding portions of the connecting bracket 50 are the upper end flange 11a and the lower end flange 11b of the cushion side frame 11. It is sandwiched between the two and is partially covered by these flanges.
Therefore, not only the frame rigidity of the cushion side frame 11 is improved, but also the portion of the connecting bracket 50 attached to the cushion side frame 11 is covered with the flange and protected from the outside.

Further, in the above configuration, as shown in FIG. 5, the upper end flange 11a and the lower end flange 11b project inward in the seat width direction to cover the second link 32 (drive link) and the sector gear portion 32a from above and below, respectively. It protrudes to the position.
Therefore, these components of the height link device 30 are protected from the outside.

<Other Embodiments>
In the above embodiment, as shown in FIG. 2, the vehicle seat S is configured to include the height link device 30 and the reclining device 40, but these devices can be changed without particular limitation. It is not always necessary to have.
In that case, the connecting bracket 50 may be configured such that one end side is directly attached to the outer surface of the back side frame 22 and the other end side is directly attached to the inner side surface of the cushion side frame 11.

In the above embodiment, as shown in FIG. 3, the rear portion of the connecting bracket 50 is attached to the outer surface of the back side frame 22, and the front portion thereof is attached so as to wrap around the inner surface of the cushion side frame 11. However, the configuration may be the exact opposite without particular limitation.
Specifically, the rear portion of the connecting bracket 50 is attached to the outer surface of the back side frame 22, and the front portion thereof is attached so as to wrap around the inner surface of the cushion side frame 11, but the connection bracket 50 is particularly limited. It can be changed without any change.

In the above embodiment, a vehicle seat used in an automobile has been described as a specific example, but the present invention is not limited to this, and can be used not only as a vehicle seat for trains and buses, but also as a vehicle seat for airplanes and ships. can do.

In the present embodiment, the vehicle seat according to the present invention has been mainly described.
However, the above-described embodiment is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof.

S Vehicle seat 1 Seat cushion 1a, 2a Cushion pad 1b, 2b Skin material 2 Seat back 10 Cushion frame 11 Cushion side frame 11a Upper end flange 11b Lower end flange 11c, 11d Through hole 12 Pan frame 13 Rear connecting frame 14 Elastic spring 20 back Frame 21 Upper frame 22 Backside frame 22a Shaft hole 23 Lower frame 24 Elastic spring 30 Height link device 31 1st link 32 2nd link (drive link)
32a Sector gear 33 Brake rotating shaft 34 Brake unit 35 Height operating lever 40 Reclining device 41 Reclining unit 42 Rotating shaft 43 Swirl spring (biased spring)
43a One end 43b The other end 44,45 Spring locking bracket 46 Operating lever 50 Connecting bracket 51 Outer side wall (first side wall)
51a Shaft hole 51b Fitting hole 51c, 51d Contact part 52 Inner side wall part (second side wall part)
52a, 52b Through hole 52c Notch 53 Connecting wall 53a Reinforcing bead 54 Fastening member (mounting member)

Claims (8)

A cushion frame serving as a skeleton of the seating portion, a back frame serving as a skeleton of the backrest portion, and a connecting bracket for connecting the rear portion of the seat of the cushion frame and the lower portion of the back frame are provided.
The back frame has a back side frame that constitutes a side surface in the seat width direction.
The cushion frame has a cushion side frame that constitutes a side surface in the seat width direction.
One end side of the connecting bracket is attached to the outer surface of the back side frame in the seat width direction, and the other end side is attached to the side surface of the cushion side frame in the seat width direction.
A reclining device for rotatably connecting the back frame to the cushion frame is provided.
The reclining device is
The rotation axis, which is the center of rotation of the back frame,
An urging spring that urges the back frame along the rotation direction about the rotation axis, and
A spring locking bracket that is attached to the outer surface of the back frame and for locking one end side of the urging spring,
It has a reclining unit that is attached to the outer surface of the backside frame and regulates the rotation of the backframe.
The spring locking bracket and the reclining unit are sandwiched between the backside frame and the connecting bracket in the seat width direction .
A first shaft hole for inserting the rotating shaft is formed on the side surface of the backside frame.
A second shaft hole for inserting the rotating shaft is formed on the side surface of the spring locking bracket.
A vehicle seat characterized in that the first shaft hole is formed larger than the second shaft hole. The connecting bracket is provided with a contact portion that comes into contact with the spring locking bracket when the backside frame rotates.
The contact portion is arranged on the front side of the seat with respect to the spring locking bracket, and is arranged so as to come into contact with the protruding portion of the spring locking bracket when the back side frame rotates toward the front side of the seat. And
The connecting bracket has a stepped shape.
The portion of the connecting bracket where the step is formed is arranged on the front side of the seat with respect to the contact portion, and is on the extension line in the rotation direction when the protruding portion of the spring locking bracket is rotated toward the front side of the seat. The vehicle seat according to claim 1, wherein the seat is arranged. The connecting bracket connects the first side wall portion attached to the outer surface of the back side frame, the second side wall portion attached to the side surface of the cushion side frame, the first side wall portion, and the second side wall portion. Has a connecting wall and
A reinforcing bead extending in a direction intersecting the extending direction of the connecting wall portion is formed on the connecting wall portion .
The reinforcing bead is
The connecting wall portion extends from a portion connected to the first side wall portion to a portion connected to the second side wall portion.
The vehicle seat according to claim 1 or 2, wherein the seat is arranged outside the connecting wall portion in the seat width direction. The connecting bracket includes an outer wall portion attached to the outer surface of the back side frame, an inner side wall portion attached to the cushion side frame and arranged inside the outer wall portion in the seat width direction, and the outer side. It has a wall portion and a connecting wall portion that connects the inner side wall portion .
The connecting wall portion is provided so as to cover the reclining unit from the outside and the bottom in the seat width direction.
The vehicle according to any one of claims 1 to 3, wherein the spring locking bracket having a protruding portion is provided so as to cover the reclining unit from the inside and above in the seat width direction. Sheet. The vehicle seat according to claim 4, wherein the inner side wall portion is formed with a protruding portion protruding from the side surface of the inner side wall portion toward one side in the seat width direction. The reclining unit is arranged between the outer wall portion and the inner side wall portion in the seat width direction.
The connecting wall portion
It is arranged at a position outside the outer peripheral surface of the reclining unit, and
The vehicle seat according to claim 4 or 5, wherein the rotating shaft is arranged between the rotating shaft and the mounting member for mounting the inner side wall portion on the cushion side frame in the front-rear direction of the seat. The mounting member is a fastening member and
Through holes for fastening the fastening members are formed in the inner side wall portion and the cushion side frame, respectively.
The vehicle seat according to claim 6, wherein the peripheral edge portion of the through hole of the inner side wall portion projects toward one side in the seat width direction. The vertical end portion of the cushion side frame, upper flange and lower flange projecting to the inside of the seat width direction is formed,
The seventh aspect of claim 7, wherein the peripheral edge portion of the through hole projects inward in the seat width direction, and at least a part thereof is covered from above and below by the upper end flange and the lower end flange. Vehicle seats.

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