JP2024024036A - vehicle seat - Google Patents

Abstract

An object of the present invention is to provide a vehicle seat that can improve the frame rigidity of a connecting portion that connects a seat cushion and a seat back. A vehicle seat S equipped with a reclining device 40 includes a connecting bracket 50 that connects a back side frame 22 and a cushion side frame 11. The connection bracket 50 has one end attached to the outer surface of the reclining unit 41 on the outer surface of the back side frame 22 in the seat front-rear direction, and the other end wrapped around and attached to the inner surface of the cushion side frame 11. [Selection diagram] Figure 3

Description

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

Conventionally, in vehicle seats equipped with reclining devices, the shape and arrangement of the connecting bracket that connects the rear end of the seat cushion and the lower end of the seat back has been changed in order to ensure frame rigidity around the device. A devised version is known (for example, see Patent Document 1).

In the vehicle seat with a reclining device described in Patent Document 1, a plate-shaped base bracket is provided, one end of which is attached to the outer surface of the seat back in the seat width direction, and the other end of which is attached to the outer surface of the seat cushion. It is being
Specifically, one end of the base bracket is attached to the outer surface of a recliner 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 that protrudes 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 recliner, which is the main body of the reclining device, from the outside, and also ensures the rigidity of the frame around the device.

Japanese Patent Application Publication No. 2012-240427

By the way, in vehicle seats, when a person sits down, a relatively large sitting load is applied to the connecting part that connects the seat cushion and the seat back, so there are measures to improve the frame rigidity of the connecting part. is required.
In particular, in a vehicle seat equipped with a reclining device such as the one disclosed in Patent Document 1, a large load is applied to the peripheral portion (connection portion) of the reclining device as the seat back rotates, so a device to further improve the frame rigidity is required. It was getting worse.

In addition, for vehicle seats with reclining devices, in order to make the seat more compact in the seat width direction, the components of the reclining device are designed and developed so that they do not protrude too much from the seat back or seat cushion to the outside in the seat width direction. was required.
Therefore, there has been a need for a technology that can make the seat more compact, and specifically, prevent the device from protruding outward in the width direction of the seat while ensuring frame rigidity around the reclining device.

In addition, since the vehicle seat with a reclining device consists of multiple components and the assembly work is relatively complicated, there was a need for a way to make the assembly work more efficient and reduce costs. .

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 that can improve the frame rigidity of the connecting portion that connects the seat cushion and the seat back. It is in.
In particular, an object of the present invention is to provide a vehicle seat with a reclining device that can improve frame rigidity around the device.
Another object of the present invention is to provide a vehicle seat in which the seat is made more compact, and in particular, in a seat equipped with a reclining device, the area around the device is made more compact.
Another object of the present invention is to provide a vehicle seat that improves the efficiency of assembly work, particularly in the case of a seat with a reclining device, in which the assembly work of the device is made more efficient.

According to the vehicle seat of the present invention, the above-mentioned problem can be solved by providing a cushion frame that serves as a skeleton of a seating portion, a back frame that serves as a skeleton of a backrest portion, a seat rear portion of the cushion frame, and a lower portion of the back frame. a connecting bracket that connects, the back frame has a back side frame that configures a side in the seat width direction, and the cushion frame has a cushion side frame that configures a side in the seat width direction. , the connection bracket has a stepped shape, and one end side is attached to one side surface of the back side frame in the seat width direction, and the other end side is attached to the other side surface of the cushion side frame in the seat width direction. The problem is solved by installing the
As described above, since the connecting bracket has a stepped shape, the bending rigidity and torsional rigidity of the bent portion can be improved compared to the conventional plate-shaped bracket.
In addition, if the step-shaped connection bracket is attached at one end to the outer surface of the back side frame and at the other end to the inner surface of the cushion side frame, the step-shaped connection bracket may be attached to the outer side in the seat width direction of the cushion side frame. It has a compact arrangement without overhanging the area.
In other words, it is possible to realize a vehicle seat that is more compact while improving the frame rigidity of the connecting portion that connects the seat cushion and the seat back.

At this time, the connection bracket is attached to an outer wall portion attached to an outer surface of the back side frame and an inner surface of the cushion side frame, and is located on the inner side in the seat width direction than the outer wall portion. It is good to have the inner wall part which is arranged, and the connection wall part which connects the said outer wall part and the said inner wall part.
With the above configuration, the connecting bracket has one end attached to the outer surface of the back side frame, extends continuously from one end to the inner side of the cushion side frame, and has the other end attached to the inner side of the cushion side frame. Therefore, the assembly rigidity of the connection bracket is improved, and interference with other components on the outer surface of the cushion side frame can be suppressed.

At this time, the reclining device includes a reclining device that rotatably connects the back frame to the cushion frame, and the reclining device is attached to an outer surface of the back side frame, and the reclining device restricts rotation of the back frame. unit, the outer wall portion is attached to the outer surface of the reclining unit in the connection bracket, and the reclining unit is preferably disposed between the outer wall portion and the inner wall portion in the seat width direction. .
With the above configuration, the connection bracket is assembled so as to cover the reclining unit, which is a main component of the reclining device, from the outside, so that the frame rigidity around the reclining device can be improved, and the area around the reclining device can be made more compact.

At this time, the connecting wall portion is preferably provided at a position facing the reclining unit in the front-rear direction of the seat, and is bent along an outer peripheral portion of the reclining unit.
The configuration of the above-mentioned connection bracket ensures protection of the reclining unit and improves the rigidity of the frame around the reclining unit, which requires relatively high rigidity.

At this time, the cushion frame has a rear connecting frame that connects the rear portions of the left and right cushion side frames, and the inner wall portion is attached to the cushion side frame by an attachment member, and the attachment member includes a plurality of attachment members. It is preferable to have a first attachment member and a second attachment member disposed at positions sandwiching the rear connection frame in a predetermined direction.
With the above configuration, when the connection bracket is attached to the side surface of the cushion side frame with the attachment member, the two attachment members are arranged so as to sandwich the relatively stiff part of the cushion side frame, so the connection bracket is The mounting rigidity of the bracket is further improved.

At this time, it is preferable that a notch portion cut out toward a side different from the rear connection frame side is formed in a portion of the outer peripheral portion of the inner wall portion that is close to the rear connection frame. .
With the above configuration, when the connection bracket is attached to the inner surface of the cushion side frame, the shape and arrangement are such that interference with the components of the cushion frame (rear connection frame) is suppressed.
In particular, when the present seat is a seat with a height link device, the inner surface of the cushion side frame has a complicated structure, so that the effects of the present invention are remarkable.

At this time, the attachment member is a fastening member, and the inner wall portion and the cushion side frame are each formed with a through hole for fastening the fastening member, and the inner wall portion is provided with a through hole for fastening the fastening member. It is preferable that the peripheral edge of the hole protrudes toward one side in the sheet width direction.
With the above configuration, the assembly rigidity of the connection bracket with the cushion side frame is further improved.
Further, although the connection bracket is generally fixed to the cushion side frame using a fastening bolt and a fastening nut, this configuration can eliminate the need for fastening nuts.
Specifically, the protruding portion of the connection bracket that is the peripheral portion of the through hole can be used in place of the fastening nut, and the protruding portion and the fastening bolt can be welded together.
By doing so, it is possible to realize a vehicle seat in which the connection bracket assembly work is made more efficient (no welding nuts are required, the number of parts is reduced, and the work process is shortened).

At this time, at least one flange of an upper end flange and a lower end flange that protrudes inward in the seat width direction is formed at an end portion in the up and down direction of the cushion side frame, and a peripheral edge portion of the through hole is formed in the seat width direction. It is preferable that the flange protrudes inward in the direction and is at least partially covered by the flange.
The above configuration not only improves the frame rigidity of the cushion side frame, but also protects the portion of the connection bracket attached to the cushion side frame from the outside by being covered by the flange.

According to the invention of claim 1, the connecting bracket has improved bending rigidity and torsional rigidity compared to the conventional plate-shaped connecting bracket.
In addition, if the step-shaped connection bracket is attached at one end to the outer surface of the back side frame and at the other end to the inner surface of the cushion side frame, the step-shaped connection bracket may be attached to the outer side in the seat width direction of the cushion side frame. It has a compact arrangement without overhanging the area.
According to the second aspect of the invention, the assembly rigidity of the connection bracket is improved, and interference with other components on the outer surface of the cushion side frame can be suppressed.

According to the third aspect of the invention, the frame rigidity around the reclining device can be improved, and the area around the reclining device can be made more compact.
According to the fourth aspect of the present invention, it is possible to ensure the protection of the reclining unit and improve the frame rigidity around the reclining unit, which requires relatively high rigidity.
According to the invention of claim 5, the mounting rigidity of the connection bracket is further improved.

According to the invention of claim 6, the connection bracket has a shape and arrangement that suppresses interference with the components of the cushion frame (rear connection frame).
In particular, when the present seat is a seat with a height link device, the inner surface of the cushion side frame has a complicated structure, so that the effects of the present invention are remarkable.
According to the seventh aspect of the invention, the assembly rigidity of the connection bracket with the cushion side frame is further improved. Furthermore, it is possible to realize a vehicle seat in which the assembly work of the connecting bracket is made more efficient (no welding nuts are required, the number of parts is reduced, and the work process is shortened).
According to the invention of claim 8, not only the frame rigidity of the cushion side frame is improved, but also the portion of the connection bracket attached to the cushion side frame is protected from the outside.

FIG. 1 is a perspective view of a vehicle seat according to the present embodiment. FIG. 2 is a perspective view of a seat frame that forms the skeleton of a vehicle seat. FIG. 3 is an enlarged view of the main part of FIG. 2 and a perspective view showing the vicinity of the reclining device. It is an exploded perspective view of a reclining device and a connection bracket. It is a perspective view when the periphery of a reclining device is seen from another angle. 6 is a sectional view taken along the line VI-VI in FIG. 5, and is a diagram illustrating an assembled state of the cushion side frame and the connection bracket. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle seat according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 6.
The present embodiment is a vehicle seat equipped with a reclining device, and includes a connecting bracket that connects a backside frame and a cushion side frame, and one end of the connecting bracket is attached to the outer surface of the backside frame in the front-rear direction of the seat. The invention relates to a vehicle seat characterized in that the seat is attached to the outer surface of a certain reclining unit, and the other end thereof is attached to the inner surface of a cushion side frame.
Note that the side of the seat back of the vehicle seat on which the seated person sits is the front side of the seat.

As shown in FIG. 1, the vehicle seat S of this embodiment includes a seat body including a seat cushion 1 and a seat back 2, and as shown in FIG. The reclining device 40 rotatably connects the seat back 2 to the seat cushion 1, and the connecting bracket 50 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 an occupant from below, and is made by placing a cushion pad 1a on a cushion frame 10 shown in FIG. It is configured.
The seat back 2 is a backrest portion that supports the back of an occupant from the rear, and is constructed by placing a cushion pad 2a on a back frame 20 shown in FIG. 2, which serves as a skeleton, and covering it with a skin material 2b.
The cushion frame 10 and the back frame 20 are connected by a connection bracket 50.

As shown in FIG. 2, the cushion frame 10 consists of a substantially rectangular frame-like body that serves as the skeleton of the seat cushion 1, and includes cushion side frames 11 arranged on the left and right sides, and a front portion of each cushion side frame 11. A plate-shaped pan frame 12 that connects the cushion side frames 11, a pipe-shaped rear connecting frame 13 that connects the rear portions of each cushion side frame 11, and a pipe-shaped rear connecting frame 13 that connects the cushion side frames 11 to each other. It mainly consists of three elastic springs 14.

The cushion side frame 11 is a sheet metal member that extends in the front-rear direction of the seat and has a substantially U-shaped vertical section. A known rail device is attached via a height link device 30.
An upper end flange 11a and a lower end flange 11b are formed at the upper end and lower end of the cushion side frame 11, respectively, to bend and project inward in the seat width direction.
As shown in FIG. 2, the upper end flange 11a and the lower end flange 11b extend in the seat front-rear direction 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.

As shown in FIG. 2, the back frame 20 is composed of a generally rectangular frame that serves as the skeleton of the seat back 2, and includes an approximately inverted U-shaped upper frame 21 extending along the seat width direction; A backside frame 22 with a substantially U-shaped cross section that extends downward from both ends in the seat width direction and extends along the vertical direction, and a substantially plate-shaped lower frame 23 that connects the lower end portions of the left and right backside frames 22. and two elastic springs 24 that are hooked to the left and right back side frames 22 and extend in a snake shape.
The back side frame 22 is a sheet metal member that extends in the vertical direction and has 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 the reclining device 40 and the connecting bracket 50. has been done. In this 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 includes left and right first links 31 arranged on the front side of the seat, and left and right first links 31 arranged on the rear side of the seat. The second link 32 serves as a driving link to adjust the height of the seat body.
As shown in FIG. 5, a sector gear part 32a is formed as a gear in a part of the outer peripheral part of the second link 32 at the connection part on the side of the cushion side frame 11. It is meshed with a pinion gear (not shown) provided inside.

Further, as shown in FIG. 2, the height link device 30 is rotatable via a brake rotation shaft 33 that is pivotally supported on the side surface of the cushion side frame 11 in the seat width direction and protrudes outward. A brake unit 34 is attached to the brake unit 34 to regulate the lifting and lowering movement of the seat body, and a height operation lever 35 is rotatably attached via the brake rotation shaft 33 and the brake unit 34 and lifts and lowers the seat body. There is.
When the height operation 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. Furthermore, the left second link 32 in which the sector gear portion 32a is formed rotates, and following the left second link 32, the right second link 32 and the left and right first links 31 also rotate. This causes the seat body to move up and down, and the seat height to be adjusted.

The reclining device 40, as shown in FIGS. 2 to 4, is a device that rotatably connects the back frame 20 to the cushion frame 10.
The reclining device 40 includes a reclining unit 41 that regulates the rotation of the back frame 20, and a rotating unit that is pivotally supported in the seat width direction by the lower end portion of the back frame 20, protrudes from the outer surface of the back frame 20, and is connected to the reclining unit 41. It mainly consists 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 biases the back frame 20 to rotate toward the cushion frame 10 around the rotation shaft 42. There is.

The reclining unit 41 can switch the state of the back frame 20 between a locked state in which the back frame 20 is fixed to the cushion frame 10 and an unlocked state in which it is relatively rotatable.
In the reclining unit 41, the state of the back frame 20 is normally in a locked state, and when the operating lever 46 shown in FIG. It is configured to switch to.
While the back frame 20 is in the unlocked state, the occupant can tilt the seat back 2 backwards, and when the rearward tilt angle reaches a desired angle, releasing the operating lever 46 brings the seat back 2 into the locked state. It is configured to return.

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

The spiral spring 43 biases the back frame 20 to rotate around the rotating shaft 42 in a cushioned state when the back frame 20 is in an unlocked state and in a rearward tilted state. do.
As shown in FIG. 4, the spiral spring 43 has one end 43a hooked to a protruding portion of a spring locking bracket 44 on the backside frame 22 side, and the other end 43b hooked to a spring locking bracket 44 on the cushion frame 10 side. It is latched onto a protruding portion of a locking bracket 45.

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

As shown in FIG. 4, on the side surface of the outer wall portion 51, there is a shaft hole 51a through which the rotating shaft 42 is inserted, and a shaft hole 51a provided around the shaft hole 51a to fit into the reclining unit 41. A fitting hole 51b is formed.
Further, contact parts 51c and 51d that can come into contact with the protruding part of the spring locking bracket 44 are formed at the upper end portion of the outer peripheral part of the outer wall part 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 by welding to the peripheral edge of the shaft hole 51a on the outer surface of the outer wall portion 51.

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

A cutout portion 52c is formed in a portion of the outer peripheral portion of the inner wall portion 52 close to the rear connection frame 13, which is cut out toward the side opposite to the rear connection frame 13 side.
The cutout portion 52c is cut out in a substantially triangular shape and is disposed between the through hole 52a and the through hole 52b to which the two fastening members 54 are fastened.

As shown in FIGS. 4 and 5, the connecting wall 53 is a portion that connects the front end of the outer wall 51 and the free end of the inner wall 52, and connects the back side frame 22 and the cushion side frame. It is arranged so that it fits between 11.
Further, the connecting wall portion 53 is provided at a position facing the reclining unit 41 in the seat front-rear direction, and is bent along the outer peripheral portion of the reclining unit 41.
Note that, 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 wall portion 52.

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

Further, in the above configuration, as shown in FIG. 13 is placed in between.
In this way, when the connecting bracket 50 is attached to the inner surface of the cushion side frame 11 with the fastening members 54, the two fastening members 54 are arranged so as to sandwich a portion of the cushion side frame 11 that has relatively increased rigidity. Therefore, the mounting rigidity of the connection 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 wall portion 52 protrude inward in the seat width direction, and the protruding peripheral edge portions form the fastening member 54. It has been concluded.
Generally, the connection bracket 50 is fixed to the cushion side frame 11 using a fastening bolt and a fastening nut, but with this configuration, the fastening nut can be made unnecessary.
Specifically, the protruding portion of the connecting bracket 50 that is the peripheral portion of the through holes 52a and 52b can be used instead of a 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 assembly rigidity.

In the above configuration, as shown in FIGS. 5 and 6, the protruding portions of the connecting bracket 50 that are the peripheral parts of the through holes 52a and 52b are the upper end flange 11a and the lower end flange 11b of the cushion side frame 11. 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 connection bracket 50 attached to the cushion side frame 11 is covered by 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 protrude inward in the seat width direction and cover the second link 32 (drive link) and the sector gear portion 32a from above and below, respectively. It sticks out to a certain point.
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 a height link device 30 and a reclining device 40, but this is not particularly limited and can be changed. does not necessarily have to be provided.
In that case, the connection bracket 50 may have one end directly attached to the outer surface of the back side frame 22 and the other end directly attached to the inner surface of the cushion side frame 11, for example.

In the above embodiment, as shown in FIG. 3, the rear portion of the connection bracket 50 is attached to the outer surface of the back side frame 22, and the front portion thereof is attached to the inner surface of the cushion side frame 11. However, there is no particular limitation and the configuration may be the exact opposite.
Specifically, the connection bracket 50 has its rear portion attached to the outer surface of the back side frame 22, and its front portion wrapped around and attached to the inner surface of the cushion side frame 11, but this is not particularly limited. It can be changed without any change.

In the above embodiment, a vehicle seat used in a car was explained as a specific example, but the invention is not limited to this, and can also be used as a seat for vehicles such as trains and buses, as well as seats for vehicles such as airplanes and ships. can do.

In this embodiment, the vehicle seat according to the present invention has been mainly described.
However, the embodiments described above are merely examples for facilitating understanding of the present invention, and do not limit the present invention. The present invention may be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof.

S Vehicle seat 1 Seat cushion 1a, 2a, Cushion pad 1b, 2b, Outer 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 connection frame 14 Elastic spring 20 Back frame 21 Upper frame 22 Back side frame 22a Shaft hole 23 Lower frame 24 Elastic spring 30 Height link device 31 First link 32 Second link (driving link)
32a Sector gear section 33 Brake rotation shaft 34 Brake unit 35 Height operation lever 40 Reclining device 41 Reclining unit 42 Rotation shaft 43 Spiral spring 43a One end 43b Other end 44, 45 Spring locking bracket 46 Operation lever 50 Connection bracket 51 Outer wall Part 51a Shaft hole 51b Fitting hole 51c, 51d Contact portion 52 Inner wall portion 52a, 52b Through hole 52c Notch portion 53 Connection wall portion 53a Reinforcement bead 54 Fastening member (attachment member)

An object of the present invention is to provide a vehicle seat that can improve the frame rigidity of a connecting portion that connects a seat cushion and a seat back .

According to the vehicle seat of the present invention, the above-mentioned problem can be solved by providing a cushion frame that serves as a skeleton of a seating portion, a back frame that serves as a skeleton of a backrest portion, a seat rear portion of the cushion frame, and a lower portion of the back frame. a connecting bracket that connects, the back frame has a back side frame that configures a side in the seat width direction, and the cushion frame has a cushion side frame that configures a side in the seat width direction. , the connection bracket has an outer wall portion, an inner wall portion disposed inside the outer wall portion in the seat width direction, and a connecting wall portion connecting the outer wall portion and the inner wall portion. A reinforcing portion is provided on a side surface of the connecting wall portion of the connecting bracket, a through hole is formed in a portion forward of the reinforcing portion on the side surface of the connecting bracket, and a peripheral portion of the through hole is formed. This problem is solved by protruding in the penetrating direction of the through hole, and the protruding portion extending so as to surround the through hole .

At this time, it is preferable that the protruding portion is curved and extends so as to surround at least a front portion of the through hole.
Further, it is preferable that a fastening member is fastened to the through hole, and the protruding portion extends so as to surround at least a front portion of the fastening member.
Further, it is preferable that the protruding portion protrudes inward in the sheet width direction.
The reinforcing portion continuously extends from an end of the outer wall on the connecting wall side through the connecting wall to an end of the inner wall on the connecting wall side. Good.
Further, the reinforcing portion is formed so that the width becomes narrower as it goes from the connecting wall toward the outer wall, and the width becomes narrower as it goes from the connecting wall toward the inner wall. It is good if it is formed.
Further, an upper end flange that is bent and protrudes in the seat width direction is formed at the upper end of the cushion side frame, and the rear part of the upper end flange and the protruding part are arranged to face each other, and the upper end flange It is preferable that the portion facing the protruding portion be wider than the portion located rearward of the opposing portion.
Further, the cushion frame has a rear connecting frame that connects rear portions of the left and right cushion side frames, and the reinforcing portion connects an outer end of the rear connecting frame and an outer side of the protruding portion in the seat width direction. It is best to place it between the ends.
The invention also includes a reclining device that rotatably connects the back frame to the cushion frame, and the reclining device includes a reclining unit that is attached to an outer surface of the back side frame and restricts rotation of the back frame. However, the protruding portion and the reinforcing portion are preferably arranged inside an outer end of the rotating shaft of the reclining unit in the seat width direction.
Further, the reinforcing portion may be formed to become narrower toward the rotation axis of the reclining unit.
Further, the reclining device includes a spiral spring that urges the back frame to rotate toward the cushion frame around the rotation axis, and the protruding portion is located at a position forward of the front end of the spiral spring. It would be good if it was placed in

According to the present invention, the connecting bracket has improved bending rigidity and torsional rigidity compared to the conventional plate-shaped connecting bracket. That is, it is possible to realize a vehicle seat that can improve the frame rigidity of the connecting portion that connects the seat cushion and the seat back.

S Vehicle seat 1 Seat cushion 1a, 2a, Cushion pad 1b, 2b, Outer 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 connection frame 14 Elastic spring 20 Back frame 21 Upper frame 22 Back side frame 22a Shaft hole 23 Lower frame 24 Elastic spring 30 Height link device 31 First link 32 Second link (driving link)
32a Sector gear section 33 Brake rotation shaft 34 Brake unit 35 Height operation lever 40 Reclining device 41 Reclining unit 42 Rotation shaft 43 Spiral spring 43a One end 43b Other end 44, 45 Spring locking bracket 46 Operation lever 50 Connection bracket 51 Outer wall Part 51a Shaft hole 51b Fitting hole 51c, 51d Contact part 52 Inner wall part 52a, 52b Through hole 52c Notch part 53 Connection wall part 53a Reinforcement bead (reinforcement part)
54 Fastening member (attachment member)

Claims (1)

A cushion frame serving as a skeleton of a seating portion, a back frame serving as a skeleton of a backrest portion, and a connecting bracket connecting a seat rear portion of the cushion frame and a lower portion of the back frame,
The back frame has a back side frame that constitutes a side in the seat width direction,
The cushion frame has a cushion side frame that constitutes a side in the seat width direction,
The connection bracket has a stepped shape, and one end side is attached to one side surface of the back side frame in the seat width direction, and the other end side is attached to the other side surface of the cushion side frame in the seat width direction. A vehicle seat characterized by being attached.

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