JP7436905B2 - vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat, and more particularly to a vehicle seat equipped with a rail device that supports a seat main body so as to be movable in the front-rear direction of the seat.

Conventionally, in a vehicle seat equipped with a rail device that supports the seat body so as to be movable in the longitudinal direction of the seat relative to the vehicle floor, a substantially L-shaped connecting bracket is used to connect the seat body and the rail device. It is being
The connection bracket is generally attached to the upper surface of the upper rail of the rail device using bolts, rivets, etc., but a new technique is known in which it is joined by laser welding for the purpose of reducing the number of parts and lightening the seat. (See Patent Documents 1 and 2).

In the vehicle seats described in Patent Document 1 and Patent Document 2, the connection bracket and the upper rail (movable rail) are joined to each other by laser welding from above the connection bracket while in contact with each other in the vertical direction. .
While ensuring the joint strength achieved by laser welding, the welding locations have been carefully considered to simplify the welding process, and the weld bead (weld mark) formed by laser welding forms a predetermined shape on the top surface of the connection bracket. It extends like an eggplant.

JP2009-202814A Japanese Patent Application Publication No. 2013-107558

There has been a need for a technology that can further improve bonding strength and facilitate bonding work.

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 with a rail device that can improve the bonding strength between component parts and facilitate the bonding work. Our goal is to provide the following .

According to the vehicle seat of the present invention, the above-mentioned problem can be solved by: a seat cushion serving as a seating portion; a lower rail attached to the vehicle body floor and extending in a predetermined direction; an upper rail that supports a cushion; and a connection bracket that is attached to the upper rail to connect the upper rail and the seat cushion; a side wall part that extends continuously upward from the wall part and to which the seat cushion side is attached; and the bottom wall part and the upper rail are joined to at least one of the bottom wall part and the upper rail. A joined portion is formed, a notch extending in the sheet width direction without reaching the side wall portion is formed in a part of the outer peripheral portion of the bottom wall portion, and the joined portion This can be solved by providing the cutout at a position that overlaps the cutout in the front-rear direction of the seat .

At this time, the connection bracket has a reinforcing wall part that connects the bottom wall part and the side wall part and extends upward from the bottom wall part toward the side wall part, and the notch has a reinforcing wall part that connects the bottom wall part and the side wall part. It is preferable that the reinforcing wall portion be provided at a position overlapping with the reinforcing wall portion.
Further, a through hole is formed in a portion of the connecting bracket located inside the bottom wall portion in the seat width direction, and the notch is provided at a position overlapping with the through hole in the seat front and rear direction. It's good to have one.
Further, the side wall portion continuously extends upward from an inner portion of the bottom wall portion in the seat width direction and is attached to the seat cushion side, and the notch is arranged on the outer side of the bottom wall portion in the seat width direction. It is good if it is formed in the part.
The seat cushion and the connecting bracket are connected to each other, and the first link and the second link are attached to the connecting bracket so as to be rotatable with respect to the connecting bracket, and the first link is more than the second link. It is also preferable that the link is disposed in front of the seat and at a different position from the second link in the seat width direction.
The vehicle seat according to claim 5, wherein the notch is formed between the first link and the second link in the front-rear direction of the seat.
A through hole is formed in a portion of the connection bracket that is located inside the bottom wall in the seat width direction, and the through hole is connected to the first link and the second link in the seat front and rear direction. It is good if it is formed between.
The seat cushion and the connection bracket are connected to each other, and the connection bracket includes a first link and a second link that are rotatably attached to the connection bracket, and the connection bracket is connected to the bottom wall portion and the connection bracket. It is preferable that the reinforcing wall portion connects a portion of the side wall portion to which the second link is attached and extends upward from the bottom wall portion toward the side wall portion.
The seat cushion and the connection bracket are each connected to each other, and includes a first link and a second link that are attached to be rotatable with respect to the connection bracket, An upper end flange extending in the front-back direction of the seat may be formed in a portion between the first link and the second link, and the upper end flange may be disposed at a position overlapping the notch in the front-rear direction of the seat.
According to the vehicle seat of the present invention, the problem is solved by: a seat body having a seat cushion and a seat back serving as a seating portion; a reclining device rotatably connecting the seat back to the seat cushion; The seat cushion includes a height link device that connects the seat body to the vehicle floor so as to be movable up and down, and a rail device that is attached to the vehicle floor and supports the seat body so as to be movable in the longitudinal direction of the seat. The seat back is configured by placing a cushion pad on a cushion frame and covering it with a skin material, the seat back is configured by placing a cushion pad on a back frame and covering it with a skin material, and the rail device is configured to cover the vehicle body with a cushion pad. a lower rail mounted on a floor and extending in a predetermined direction; an upper rail slidably mounted along the lower rail and supporting the seat cushion; and a lower rail mounted on the upper rail to connect the upper rail and the seat cushion. The connecting bracket has a bottom wall portion that contacts the upper surface of the upper rail, and a side wall portion that extends continuously upward from the bottom wall portion and to which the seat cushion side is attached. By joining the bottom wall part and the upper rail, a part joined to at least one of the bottom wall part and the upper rail is formed, and a part of the outer peripheral part of the bottom wall part includes: The problem is solved by forming a notch extending in the width direction of the seat without reaching the side wall portion, and the joined portion being provided at a position overlapping the notch in the front-rear direction of the seat. Ru.

According to the present invention, it is possible to provide a vehicle seat with a rail device that can improve the bonding strength between component parts and facilitate the bonding work.

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 shows a connection bracket for connecting the seat cushion and the rail device. FIG. 3 is a front view illustrating a state in which the connection bracket is attached to the rail device (upper rail). FIG. 4 is a sectional view taken along the line VV in FIG. 3 and is a diagram illustrating a state in which laser welding is performed from the outside and inside in the sheet width direction. FIG. 4 is a sectional view taken along the line VI-VI in FIG. 3 and is a diagram illustrating a state in which laser welding is performed from the outside and inside in the sheet width direction.

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.
This embodiment is a vehicle seat equipped with a rail device that supports a seat body so as to be movable back and forth, and includes a connecting bracket for connecting a cushion frame and an upper rail, and the connecting bracket and the upper rail are in vertical contact with each other. A welding mark is formed by laser welding the outer peripheral part of the part from both sides in the sheet width direction. , and a second welded portion extending along the inner surface in the width direction of the seat.
Note that the side on which the occupant 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 this embodiment includes a seat body including a seat cushion 1 and a seat back 2, and as shown in FIG. a reclining device 20 that rotatably connects the seat body, a height link device 30 that connects the seat body to the vehicle floor so as to be movable up and down, and a rail device 40 that is attached to the vehicle floor and supports the seat body so as to be movable back and forth. It is mainly composed of.

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 behind, and is configured by placing a cushion pad 2a on a back frame serving as a skeleton and covering it with a skin material 2b.

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 connects the side frames 11 arranged on the left and right sides and the front portion of each side frame 11. a plate-shaped pan frame 12 that connects the rear parts of each side frame 11, a pipe-shaped rear connecting frame 13 that connects the rear parts of each side frame 11, and three elastic elements that are latched onto the pan frame 12 and the rear connecting frame 13 and extend in a serpentine shape. It mainly consists of a spring 14.
The side frame 11 is a sheet metal member that extends in the front-rear direction of the seat and has a substantially I-shaped longitudinal section. A rail device 40 is attached.

As shown in FIG. 2, the reclining device 20 is switchable between a locked state in which the rotational movement of the seat back 2 is locked and an unlocked state, and the reclining device 20 can be switched between a state in which the seat back 2 is locked in an upright position and a state in which the seat back 2 is locked in an upright position. This device is capable of releasing the locked state and adjusting the upright posture of the seat back 2 by operating a reclining operation lever (not shown).
More specifically, the reclining device 20 is attached to the rear portion of the seat cushion 1 and urges the back rotation shaft 21 that is the center of rotation and the seat back 2 to rotate forward about the back rotation shaft 21. It mainly consists of a spiral spring 22.
The back rotation shaft 21 is pivotally supported on the seat cushion 1 side and the seat back 2 side in the seat width direction, and the spiral spring 22 has one end locked on the seat cushion 1 side and the other end on the seat back 2 side. It is locked to.

As shown in FIGS. 2 and 3, the height link device 30 is attached between the cushion frame 10 and the rail device 40, and has left and right first links 31 arranged on the front side of the seat, and a first link 31 arranged on the rear side of the seat. This device is equipped with left and right second links 32, and the second links 32 serve as driving links to adjust the height of the seat body.
In addition, in the connecting portion of the second link 32 on the side of the cushion frame 10 (side frame 11), a sector gear portion (not shown) is formed as a gear in a part of the outer peripheral portion of the connecting portion on the side of the cushion frame 10 (side frame 11). It is meshed with a pinion gear (not shown) provided on the left and right inner sides of 34.

The height link device 30 is pivotally supported on the side surface of the side frame 11 in the seat width direction, and is rotatably attached via a brake rotation shaft 33 that protrudes outward and lifts and lowers the seat body. It includes a brake unit 34 that regulates the movement, and a height operation lever 35 that is rotatably attached via the brake rotation shaft 33 and the brake unit 34 and that moves the seat body up and down.
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 changes. Furthermore, the left second link 32 in which the sector gear portion 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.

As shown in FIGS. 2 and 3, the rail device 40 includes left and right lower rails 41 that are fixed to the vehicle body floor and extend in the front-rear direction of the seat, and left and right upper rails 42 that are slidably supported along the lower rails 41. It mainly consists of a locking member (not shown) that locks the upper rail 42 in a non-slidable manner, and a rail operating lever 43 that releases the locked state of the locking member.
The lower rails 41 are made of elongated hollow bodies, and are arranged on the left and right sides at intervals in the seat width direction, and form storage spaces with a substantially convex cross section along the seat front and rear directions.
The upper rail 42 is a long body that slides along the lower rail 41 while being inserted into the housing space of the lower rail 41. As shown in FIG. connected to the side.

As shown in FIGS. 3 and 4, the connection bracket 50 is made of a sheet metal member with a substantially L-shaped longitudinal section extending in the front-rear direction of the seat, and connects the upper rail 42 in the vertical direction, the link 31 on the cushion frame 10 side, This is a member for connecting with 32.
The connection bracket 50 has a bottom wall portion 51 that contacts the upper surface of the upper rail 42 and continuously extends upward from the inner end of the bottom wall portion 51 in the left and right direction, and has links 31 and 32 rotatably attached thereto. It is mainly composed of a side wall part 52 that extends upwardly from the front end of the bottom wall part 51 and a front wall part 53 that is also connected to the front end of the side wall part 52.
Note that the bottom wall portion 51 corresponds to a contact portion that contacts the upper surface (abutted portion) of the upper rail 42 in the claims.

The bottom wall portion 51 extends along the upper rail 42, and has cutouts 51a provided on the outer surface in the seat width direction at predetermined intervals and cut toward the inner side in the seat width direction. are formed.
The cutout 51a is a substantially rectangular cutout portion that extends inward in the seat width direction within a range that does not reach the center of the upper rail 42 in the seat width direction. Further, it is arranged between the first link 31 and the second link 32 in the seat front and back direction.
The bottom wall portion 51 is joined to the upper rail 42 by laser welding the outer peripheral portion of the portion where the bottom surface and the upper surface of the upper rail 42 contact.
Specifically, by laser welding the outer peripheral portion from the outside and inside in the seat width direction, welding marks 60 are formed on both the bottom wall portion 51 and the upper surface of the upper rail 42 .

The side wall portion 52 extends in the front-rear direction along the bottom wall portion 51, and moves away from the bottom wall portion 51 in the seat width direction from the portion where the first link 31 is attached to the portion where the second link 32 is attached. It is bent in the direction.
Further, between the first link 31 and the second link 32 of the side wall portion 52, there is an upper end flange 52a extending in the seat front and rear direction, and a harness for passing the rail device 40 or a known device around the rail device 40. A harness passage hole 52b is formed.
The upper end flange 52a and the harness passage hole 52b are formed at a position facing the notch 51a in the seat front-rear direction.

A reinforcing wall portion 54 extending upward from the bottom wall portion 51 toward the side wall portion 52 is formed at a portion where the bottom wall portion 51 and the portion of the side wall portion 52 to which the second link 32 is attached are connected.
The reinforcing wall portion 54 is inclined upward from the bottom wall portion 51 toward the side wall portion 52, and specifically, at an angle of about 15 to 45 degrees, preferably about 30 degrees, with respect to the bottom wall portion. Sloping upwards.
Further, the reinforcing wall portion 54 is formed with a reinforcing convex portion 54a that is raised upward. The reinforcing convex portions 54a extend from the portion of the reinforcing wall portion 54 connected to the bottom wall portion 51 to the portion connected to the side wall portion 52, and are formed in plurality at predetermined intervals in the seat front-rear direction.

As shown in FIGS. 3 to 6, the welding marks 60 are formed by laser welding a part of the outer periphery of the portion where the bottom wall portion 51 and the upper surface of the upper rail 42 abut.
The welding marks 60 include a first welded portion 61 extending along the outer surface in the sheet width direction and a second welded portion 62 extending along the inner surface in the sheet width direction in the outer peripheral portion. We are prepared.
The first welded portion 61 extends along the outer surface of the outer peripheral portion of the bottom wall portion 51 that includes the notch 51a, and more specifically, it extends discontinuously at the position of the notch 51a. .
The second welded portion 62 extends continuously along the inner surface of the outer peripheral portion of the bottom wall portion 51 .

In the above configuration, the first welded portion 61 and the second welded portion 62 are formed by laser welding from the outside and inside in the sheet width direction, respectively.
Therefore, welding work can be performed from a position where it is relatively easy to secure space.

Further, in the above configuration, as shown in FIGS. 3 and 4, the second link 32 is arranged at a different position (offset arrangement) to the inner side in the seat width direction than the first link 31.
Generally, in a seat equipped with a height link device 30, the height control lever 35 is connected to the height control lever 35 via the brake unit 34 so that the height control lever 35 does not protrude outward from the seat body in the seat width direction as much as possible. Two links 32 (driving links) are arranged offset to the inside in the seat width direction.
By arranging the links offset from each other in this way, the joint strength of the connection bracket 50 is required to be higher than usual, but with this configuration using laser welding as described above, the joint strength of the connection bracket 50 can be sufficiently ensured. can do.

Further, in the above configuration, the connecting bracket 50 is formed with a reinforcing wall portion 54 having an inclined shape as a chamfered portion corresponding to the offset arrangement of the second link 32.
Generally, when laser welding is attempted from the inside in the sheet width direction, the portion of the connection bracket 50 that protrudes toward the second link 32 gets in the way, making it difficult to perform laser irradiation appropriately. However, with the configuration of the present invention, the reinforcing wall portion 54 can avoid a portion that would get in the way of laser irradiation.
Specifically, when a laser beam is irradiated onto a target area, a portion of it becomes reflected laser and bounces back, so it is necessary to avoid placing components in the area where the reflected laser passes. With the configuration of the connection bracket 50, laser welding work can be performed suitably.

<Other embodiments>
In the above embodiment, as shown in FIG. 3, the vehicle seat S is configured to include a height link device 30, but it is not necessarily necessary, and the cushion frame 10 (side frame 11) and the connection bracket 50 are provided. They may be directly connected.
Moreover, instead of the connection bracket 50, a connection part may be provided integrally with the lower end portion of the side frame 11, and the connection part and the upper rail 42 may be connected.

In the embodiment described above, the connection bracket 50 is attached to the upper rail by laser welding, but it is not limited to laser welding, and various welding methods such as arc welding and spot welding may be used. Also good.

In the above embodiment, as shown in FIG. 3, the connecting bracket 50 is joined to the upper rail 42 by laser welding the outer peripheral portion of the portion that contacts the upper rail 42 from both sides in the seat width direction. The direction and location of laser welding are not particularly limited and can be changed.
For example, the outer peripheral portion may be laser welded only from the outside in the sheet width direction, or may be laser welded only from the front side of the sheet.
If the outer peripheral portion is laser welded only from the outside in the sheet width direction, only the first welded portion 61 will be formed as the welding mark 60.
At this time, the welding location of the first welding part 61 is also arbitrary, and for example, when the notch 51a is not formed, the first welding part 61 continuously extends along the outer surface of the outer peripheral part. They may be continuous, or they may extend discontinuously at intervals. For example, even when the notch 51a is formed, the first welded portion 61 may extend continuously along the outer surface including the entire circumference of the notch 51a.

In the above embodiment, as shown in FIG. 3, welding marks 60 are formed on both the connecting bracket 50 and the upper rail 42 by laser welding the outer peripheral portion of the portion where the connecting bracket 50 and the upper rail 42 abut. However, the welding marks 60 do not necessarily have to be formed on both sides.
Generally, the connecting bracket 50 is thicker than the upper rail 42, so by laser welding the parts where they abut against each other at a position slightly closer to the connecting bracket 50, the upper rail 42 can be made less susceptible to heat. can. At this time, large welding marks 60 are formed on the connection bracket 50.

In the above embodiment, a vehicle seat used in a car was described 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 Side frame 12 Pan frame 13 Rear connection frame 14 Elastic spring 20 Reclining device 21 Back rotation shaft 22 Spiral spring 30 Height link device 31 First link 32 Second link 33 Brake rotation shaft 34 Brake unit 35 Height operation lever 40 Rail device 41 Lower rail 42 Upper rail 43 Rail operation lever 50 Connection bracket 51 Bottom wall part (contact part)
51a Notch 52 Side wall portion 52a Upper end flange 52b Harness passage hole 53 Front wall portion 54 Reinforcement wall portion 54a Reinforcement convex portion 60 Welding trace 61 First welded portion 62 Second welded portion

Claims (10)

A seat cushion that serves as a seating area,
a lower rail attached to the vehicle body floor and extending in a predetermined direction; an upper rail attached slidably along the lower rail and supporting the seat cushion;
a connection bracket mounted on the upper rail to connect the upper rail and the seat cushion;
The connection bracket has a bottom wall portion that comes into contact with the upper surface of the upper rail, and a side wall portion that continuously extends upward from the bottom wall portion and to which the seat cushion side is attached .
By joining the bottom wall part and the upper rail, a part joined to at least one of the bottom wall part and the upper rail is formed,
A notch extending in the seat width direction without reaching the side wall is formed in a part of the outer peripheral portion of the bottom wall,
A vehicle seat , wherein the joined portion is provided at a position that overlaps the notch in the seat front-rear direction . The connection bracket connects the bottom wall and the side wall, and has a reinforcing wall that extends upward from the bottom wall toward the side wall,
2. The vehicle seat according to claim 1, wherein the notch is provided at a position overlapping the reinforcing wall portion in the front-rear direction of the seat. A through hole is formed in a portion of the connection bracket located inside the bottom wall portion in the seat width direction,
The vehicle seat according to claim 1 or 2, wherein the cutout is provided at a position overlapping the through hole in the seat front-rear direction. The side wall portion continuously extends upward from an inner portion of the bottom wall portion in the seat width direction, and is attached to the seat cushion side,
The vehicle seat according to any one of claims 1 to 3, wherein the notch is formed in an outer portion of the bottom wall portion in the seat width direction. a first link and a second link that connect the seat cushion and the connection bracket, and are rotatably attached to the connection bracket;
5. The vehicle according to claim 1, wherein the first link is located further forward of the seat than the second link, and is located at a different position from the second link in the seat width direction. Vehicle seats listed in section. 6. The vehicle seat according to claim 5, wherein the notch is formed between the first link and the second link in the front-rear direction of the seat. A through hole is formed in a portion of the connection bracket located inside the bottom wall portion in the seat width direction,
The vehicle seat according to claim 5 or 6, wherein the through hole is formed between the first link and the second link in the seat front-rear direction. a first link and a second link that connect the seat cushion and the connection bracket, and are rotatably attached to the connection bracket;
The connection bracket connects the bottom wall and a portion of the side wall to which the second link is attached, and has a reinforcing wall that extends upward from the bottom wall toward the side wall. The vehicle seat according to any one of claims 5 to 7, characterized in that: a first link and a second link that connect the seat cushion and the connection bracket, and are rotatably attached to the connection bracket;
An upper end flange extending in the front-back direction of the seat is formed at a portion of the upper end of the side wall portion between the first link and the second link,
The vehicle seat according to any one of claims 1 to 8, wherein the upper end flange is disposed at a position overlapping the notch in the front-rear direction of the seat. a seat body having a seat cushion and a seat back serving as a seating portion;
a reclining device that rotatably connects the seat back to the seat cushion;
a height link device that connects the seat body to the vehicle floor so that it can be raised and lowered;
a rail device that is attached to the vehicle body floor and supports the seat body so as to be movable in the seat front-rear direction;
The seat cushion is configured by placing a cushion pad on a cushion frame and covering it with a skin material,
The seat back is configured by placing a cushion pad on a back frame and covering it with a skin material,
The rail device connects a lower rail mounted on the vehicle body floor and extending in a predetermined direction, an upper rail slidably mounted along the lower rail and supporting the seat cushion, and the upper rail and the seat cushion. a coupling bracket mounted on the upper rail for the purpose of
The connection bracket has a bottom wall portion that comes into contact with the upper surface of the upper rail, and a side wall portion that continuously extends upward from the bottom wall portion and to which the seat cushion side is attached.
By joining the bottom wall part and the upper rail, a part joined to at least one of the bottom wall part and the upper rail is formed,
A notch extending in the seat width direction without reaching the side wall is formed in a part of the outer peripheral portion of the bottom wall,
A vehicle seat, wherein the joined portion is provided at a position that overlaps the notch in the seat front-rear direction.

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