WO2016047562A1

WO2016047562A1 - Vehicular seat frame and vehicular seat

Info

Publication number: WO2016047562A1
Application number: PCT/JP2015/076534
Authority: WO
Inventors: 博行糸井; 貴弘新村; 誉史橋本
Original assignee: テイ・エステック株式会社
Priority date: 2014-09-22
Filing date: 2015-09-17
Publication date: 2016-03-31
Also published as: JPWO2016047562A1; JP6669971B2

Abstract

　The present invention provides a vehicular seat frame having a device for linking together two members as constituent elements so that the members are capable of relative rotation, the assembling rigidity of the device being ensured, and the assembly operation being more efficient. A vehicular seat (S) is provided with a reclining device (30) for rotatably linking a back frame (20) to a cushion frame. A reclining main body (31) is securely welded in an assembled state in fitting holes (21) provided in the outside lateral surface of the back frame (20). A circular welding mark (60) extends continuously so as to encircle the periphery of the fitting holes (21), and passes alternately through sections where the fitting holes (21) and fitting protrusions (32) are in contact, and sections where the side surfaces of the back frame (20) and the reclining main body (31) overlap.

Description

Vehicle seat frame and vehicle seat

The present invention relates to a vehicle seat frame and a vehicle seat, and in particular, a vehicle seat frame including a device that couples two members, which are constituent elements of the seat frame, with each other so as to be relatively rotatable via a rotation shaft. And a vehicle seat.

2. Description of the Related Art Conventionally, a vehicle seat including a reclining device that rotatably connects a back frame that is a skeleton of a backrest portion to a cushion frame that is a skeleton of a seating portion is widely known.
The reclining device can be switched between a locked state that locks the pivoting movement of the back frame and an unlocked state, and is normally locked when the back frame is locked in an upright position and the operation lever is operated. And the standing posture of the back frame can be adjusted (see, for example, Patent Documents 1, 2, and 3).

In the seat frame described in Patent Literature 1, a recliner serving as a main body of the reclining device is assembled to the outer side surface of the back frame in the seat width direction.
More specifically, a star-shaped protrusion provided on the inner surface of the recliner is fitted into a star-shaped through hole provided on the outer surface of the back frame. And the peripheral part which the projection part and the through-hole are contacting is weld-joined over the whole.

In addition, the reclining device described in Patent Document 2 includes a rotating shaft that connects the cushion frame and the back frame, a spiral spring that urges the back frame forward of the seat around the rotating shaft, and a lateral width of the back frame. And a spring locking bracket for locking the free end side of the spiral spring.
And, in order to regulate the rotation operation of the back frame, when the back frame rotates to a predetermined rotation position, the spring locking bracket attached to the back frame and a part of the cushion frame come into contact with each other It has become.

Also, the reclining device described in Patent Document 3 has the same configuration, and a spring locking bracket is fixed by welding to the back frame.

JP 2012-116340 A JP 2012-126246 A JP 2013-27922 A

By the way, the reclining device is a component that receives a relatively large load in accordance with the rotation operation of the back frame. Therefore, it is necessary to ensure the assembly rigidity with respect to the back frame. On the other hand, since the reclining device is a combination of a plurality of members, and the assembling work is relatively complicated, there is a need for a device that makes the assembling work more efficient and reduces costs.
In the reclining device as described in Patent Document 1 described above, in order to secure the assembly rigidity, the peripheral portion where the recliner side protrusion and the back frame side through hole are in contact with each other is welded together. Therefore, the efficiency of welding work is inferior, and costs such as material costs and process costs are high.

Meanwhile, the spring locking bracket of the reclining device is a member to which the urging force of the spiral spring is directly applied during the rotation operation of the back frame, and abuts against a part of the cushion frame in order to restrict the rotation operation of the back frame. Are arranged as follows. Therefore, it is necessary to ensure the mounting rigidity of the spring locking bracket.
Therefore, in the reclining device as in Patent Document 2 and Patent Document 3, attachment is performed by adding a work for fixing the spring locking bracket to the back frame by welding and a work for fastening the bolt by providing a through hole in the spring locking bracket. The rigidity was secured.
However, there has been a demand for a technique for improving the assembly rigidity without making the assembly operation of the spring locking bracket a complicated process.
In particular, in order to improve work efficiency, a technique for locally reinforcing a portion of the spring locking bracket where the load is concentrated in consideration of how to apply the load during the reclining operation is required.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a device for connecting two members as constituent elements so as to be capable of relative rotation, and to secure the assembly rigidity of the device. However, an object of the present invention is to provide a vehicle seat frame and a vehicle seat in which the assembly work is made efficient.
Another object of the present invention is to provide a vehicle seat frame and a vehicle seat in which a load-concentrated portion of the device is locally reinforced in consideration of how the load is applied during operation of the device. There is to do.

According to the vehicle seat frame of the present invention, the subject is a vehicle seat frame that is a skeleton of the vehicle seat, the first member that is a component of the vehicle seat frame, and the first member A second member coupled via a rotation shaft so as to be rotatable with respect to the second member, and a lock member attached to the second member and locking the rotation of the second member, On the surface of the lock member, a fitting portion for assembling to the fitted portion provided on the surface of the second member is formed and welded in a state where the fitted portion and the fitting portion are assembled. As a result, a welding mark is formed on at least one surface of the second member and the lock member, and the welding mark continuously extends so as to surround the fitted part and the fitting part. , A portion where the fitted portion and the fitting portion are in contact with each other; The serial each surface of the second member and the locking member is through a portion that is superimposed, is solved by.

With the above configuration, when assembling the lock member, which is a component part of the device that couples the two members so as to be relatively rotatable, the fitted portion on the second member side and the fitting portion on the lock member side are assembled. Since it is welded in a state in which the lock member is assembled, the assembly rigidity of the lock member can be secured.
And the welding trace extends so as to surround the fitted part and the periphery of the fitted part, and the surface of each of the second member and the lock member, the part where the fitted part and the fitted part are in contact with each other Since it passes through the overlapping part, it forms a simple welding mark compared to the case where the entire peripheral part where the fitted part and the fitting part are in contact is welded as in the past. This improves the efficiency of welding work. If the shape of the welding mark is simple, variations in welding work can be suppressed and costs can be easily reduced.

At this time, it is preferable that the welding mark continuously extends so as to surround the fitted portion and the fitting portion.
With the above configuration, for example, the efficiency of the welding operation is increased as compared with a case where a plurality of welding marks are formed discontinuously. In general, since the starting point of the welding trace is likely to generate a crack, the joint strength becomes higher as the welding trace extends continuously.

At this time, the first member is a cushion frame serving as a skeleton of a seating portion, the second member is a back frame serving as a skeleton of a backrest portion, and the locking member is It is a main body of a reclining device that connects the back frame so as to be relatively rotatable, and is preferably assembled to a side surface of the back frame in the seat width direction.
With the above-described configuration, the reclining device is a component in which a relatively large load is applied among the components of the seat frame, and on the other hand, a plurality of members are combined in a complicated manner. It will be meaningful.

At this time, the welding mark is preferably formed in a substantially circular shape or a substantially elliptical shape.
With the above configuration, since the welding trace has a simple shape, the efficiency of the welding operation is further increased, variation in the welding operation is further suppressed, and the cost can be further reduced.

At this time, the fitted portion is a fitting hole formed so as to penetrate the side surface of the second member in the sheet width direction, and the fitting portion protrudes from the side surface of the lock member. Preferably, the welding mark is formed on a side surface of the second member.
With the above configuration, a fitting structure in which the assembling work between the second member and the lock member is easy is provided.

At this time, the fitting protrusions are a pair of first fitting protrusions disposed at positions where the rotation shaft is sandwiched in the vertical direction, and a pair of positions disposed at positions where the rotation shaft is sandwiched in the seat front-rear direction. It is good for the welding trace to extend so that it may pass at least the part which the pair of 1st fitting projection parts and the fitting hole contact.
With the above configuration, in order to perform welding with aiming at a portion where the fitting protrusion and the fitting hole are generally in contact with each other, relatively high accuracy is required. Even the portion where the pair of first fitting protrusions and the fitting hole are in contact with each other only needs to be formed with high accuracy, and the efficiency of the welding operation can be improved.

At this time, the welding mark alternately passes through a portion where the fitting hole and the fitting protrusion are in contact with each other and a portion where the side surfaces of the second member and the lock member are overlapped. It is good to extend like this.
Compared to the case where the peripheral portion where the fitting hole and the fitting projection are in contact with each other is welded over the entire structure as in the conventional case, it is possible to ensure the same mounting rigidity and the efficiency of the welding work. Can be significantly improved.

At this time, the welding mark is a first welding mark, and an urging spring for urging the second member along the rotation direction around the rotation axis, and a base attached to the second member And a spring locking member provided so as to protrude from the outer surface of the base, and to which one end side of the biasing spring is locked, and the base and the second member By welding in a contact state, a second welding mark is formed on at least one of the base and the second member, and the second welding mark is between the locking portion and the first welding mark. It is good to be arranged in.
With the above configuration, when assembling a spring locking member that is a component part of a device that couples two members so that they can rotate relative to each other, considering how to apply a load during operation of the device, a comparison is made among the devices. It is possible to locally reinforce the portion where the mechanical load is concentrated.
More specifically, the spring locking member is a member to which the urging force of the urging spring is directly applied when the second member rotates, and for example, a part of the first member for restricting the rotation of the second member. Is a member that is relatively easy to concentrate loads.
Therefore, in the base portion of the spring locking member, the second welding trace is formed between the locking portion where one end of the biasing spring is locked and the first welding trace for assembling the lock member. In particular, the portion where the load tends to concentrate can be locally reinforced by welding.

At this time, it is preferable that the second welding mark is disposed inside the outer peripheral portion of the base portion in the base portion.
Further, it is preferable that at least a part of the second welding mark is substantially linear.
The second welding mark may be substantially L-shaped.
The second welding mark may be substantially U-shaped.
With the above configuration, when the spring locking member is assembled, the welding operation (assembly operation) of the spring locking member can be made efficient by forming a simple weld portion.

At this time, a processing portion for attaching to the second member is formed on the outer surface of the base portion, and the second welding trace is between the processing portion and the outer peripheral portion of the base portion in the base portion. It is good to be arranged in.
With the above configuration, when assembling the spring locking member, the processed portion is further formed after reinforcing the portion of the spring locking member where load is particularly concentrated by welding and fixing the spring locking member. Assembly rigidity is improved.

At this time, the second welding mark may be arranged so as to avoid a portion of the base portion that overlaps the locking portion in the axial direction of the rotation shaft.
With the above configuration, for example, when laser welding is performed from the locking portion side (from the left and right outer sides) in the axial direction of the rotation shaft, the locking portion has a shape that does not interfere (do not interfere).

At this time, a vehicle seat provided with the vehicle seat frame as a skeleton can also be realized.

According to the present invention, it is possible to secure the assembly rigidity of a device that connects two members so as to be relatively rotatable.
And compared with the shape of the conventional welding trace, it becomes easy to form a simple welding trace, and the efficiency of welding operation goes up. If the shape of the welding mark is simple, variations in welding work can be suppressed and costs can be easily reduced.
And since the welding trace is extended continuously, the efficiency of welding operation improves compared with the case where multiple welding traces are formed discontinuously, for example. In general, since the starting point of the welding mark is likely to be cracked, the joint strength becomes higher as the welding mark extends continuously.

According to this invention, it becomes a fitting structure with which the assembly | attachment operation | work of a 2nd member and a lock member is easy.
According to the present invention, in general, in order to weld a portion where the fitting protrusion and the fitting hole are in contact with each other, a relatively high accuracy is required. It is only necessary to form the portion where the pair of first fitting protrusions and the fitting hole are in contact with each other as a whole, and the efficiency of the welding operation can be improved.
According to the present invention, as compared with the conventional case where the peripheral portion where the fitting hole and the fitting protrusion are in contact with each other is welded over the whole, it is possible to ensure the same mounting rigidity and Efficiency can be greatly improved.

According to the present invention, when assembling a spring locking member that is a component part of a device that couples two members so as to be relatively rotatable, considering how to apply a load during operation of the device, The portion where the load is relatively concentrated can be locally reinforced.
More specifically, the spring locking member is a member to which the urging force of the urging spring is directly applied when the second member rotates, and for example, a part of the first member for restricting the rotation of the second member. This is a portion where the load is relatively easy to concentrate.
Therefore, in the base portion of the spring locking member, the second welding trace is formed between the locking portion where one end of the biasing spring is locked and the first welding trace for assembling the lock member. In particular, the portion where the load tends to concentrate can be locally reinforced by welding.

According to the present invention, when the spring locking member is assembled, the welding operation (assembly operation) of the spring locking member can be made efficient by forming a simple welded portion.
According to the present invention, when the spring locking member is assembled, the processed portion is formed after reinforcing the portion of the spring locking member where load is particularly concentrated by welding and fixing the spring locking member. The assembly rigidity of the members is improved.
According to the present invention, for example, when laser welding is performed from the locking portion side (from the left and right outer sides) in the axial direction of the rotation shaft, the locking portion has a shape that does not interfere (does not interfere).
According to the present invention, a vehicle seat including the vehicle seat frame as a skeleton can also be realized.

It is a perspective view of a vehicular seat concerning this embodiment. It is a perspective view of the vehicle seat frame used as the frame | skeleton of a vehicle seat. It is a principal part enlarged view of FIG. 2, and is a figure explaining the reclining apparatus periphery. It is a disassembled perspective view of the reclining apparatus attached to a back frame. It is a disassembled perspective view of the reclining apparatus seen from another angle. It is a figure explaining the state which the back frame rotated to the predetermined position and the spring latching bracket contact | abutted to a part of cushion frame. It is a figure explaining the formation position of the welding trace seen from the inner side of the back frame. It is 2nd Embodiment and is a figure explaining the formation position of a welding trace. It is 3rd Embodiment and is a figure explaining the formation position of a welding trace. It is 4th Embodiment and is a figure explaining a reclining apparatus periphery. It is 4th Embodiment and is a figure explaining the formation position of a welding trace.

Hereinafter, a vehicle seat according to an embodiment of the present invention will be described with reference to FIGS.
The present embodiment includes a reclining device that rotatably couples the back frame to the cushion frame, and the reclining main body is welded and fixed in a state of being assembled in a fitting hole provided on the outer surface of the back frame. Each of the back frame and the reclining main body has a substantially circular weld mark extending continuously so as to surround the periphery of the fitting hole, and the portion where the fitting hole and the fitting protrusion are in contact with each other. The present invention relates to an invention of a vehicle seat characterized by alternately passing through portions where side surfaces are overlapped.
The cushion frame and the back frame correspond to a first member and a second member, respectively, in the claims. The reclining body corresponds to a lock member.
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 according to the present embodiment mainly includes a seat cushion 1 serving as a seating portion and a seat back 2 serving as a backrest portion, and serves as a skeleton. A cushion pad (not shown) is placed on the frame Sa and covered with a skin material (not shown).
Further, as shown in FIG. 2, the vehicle seat S is connected to the cushion frame 10 that is the skeleton of the seat cushion 1 so that the back frame 20 that is the skeleton of the seat back 2 can be relatively rotated. A reclining device 30 is provided.

As shown in FIG. 2, the cushion frame 10 is formed of a substantially rectangular frame, and a slide rail device (not shown) for sliding the vehicle seat S in the front-rear direction and the vehicle seat S in the vertical direction. It is attached to the vehicle body floor via a height adjusting device (not shown) for movement.
As shown in FIG. 3 and FIG. 4, the shaft hole 11 for inserting the rotation shaft 33 of the reclining device 30 and the shaft hole are formed in the seat rear end portion of the cushion frame 10 in the lateral direction of the seat. 11, and a locking portion 12 that is locked to the other end of the urging spring 34 of the reclining device 30 is formed.

As shown in FIG. 2, the back frame 20 is formed of a substantially rectangular frame, and is supported by connecting the lower end portion thereof to the rear end portion of the cushion frame 10 via the reclining device 30. In such a state, the back frame 20 can rotate relative to the cushion frame 10.
As shown in FIGS. 4 and 5, the lower end portion of the back frame 20 and the outer side surface in the left-right direction of the seat, as shown in FIG. 4 and FIG. Assembling holes 22 for assembling 35 are formed.

As shown in FIG. 4, the fitting hole 21 is formed of a substantially four-leaf shaped through hole, and is formed at a position where the fitting protrusion 32 provided on the inner surface of the reclining body 31 can be assembled.
The fitting hole 21 includes a pair of first fitting hole portions 21a disposed at a position sandwiching the rotation shaft 33 in the vertical direction when the vehicle seat S is in the use position, and a rotation shaft in the seat front-rear direction. And a pair of second fitting holes 21b arranged at positions sandwiching 33.
The use position of the vehicle seat S is a position where the occupant can be seated in a state where the back frame 20 is locked in a standing posture as shown in FIG. 2, for example.

As shown in FIGS. 3 to 5, the reclining device 30 includes a device that rotatably connects the back frame 20 to the cushion frame 10, and is attached to the outer side surface of the back frame 20 in the left-right width direction. .
The reclining device 30 includes a reclining body 31 that is driven when the back frame 20 is rotated, a rotation shaft 33, an urging spring 34 that urges the back frame 20 along the rotation direction, and the back frame 20. A spring locking member 35 that is attached to the outer side surface and that locks one end of the urging spring 34 is mainly configured.

The reclining body 31 includes a known lock mechanism, and the back frame 20 is in a locked state in which the back frame 20 is fixed to the cushion frame 10 and an unlocked state in which the relative rotation with respect to the cushion frame 10 is possible. It is possible to switch between.
In addition, the reclining main body 31 cancels | releases a locked state by operating the operation lever 37 shown in FIG. 2 from the state which locked the back frame 20 in the standing posture.
On the inner side surface of the reclining main body 31 in the seat width direction, a fitting protrusion 32 for assembling into the fitting hole 21 of the back frame 20 is formed.

As shown in FIG. 5, the fitting protrusion 32 is formed of a substantially curved protruding portion that protrudes from the outer surface of the reclining body 31, and is discontinuous on the same circumference around the central axis of the reclining body 31. A plurality are formed.
As shown in FIGS. 5 and 7, when the vehicle seat S is in the use position, the fitting protrusion 32 is a pair of first fitting protrusions that are disposed at positions that sandwich the rotation shaft 33 in the vertical direction. 32a and a pair of second fitting protrusions 32b arranged at positions sandwiching the rotation shaft 33 in the front-rear direction of the seat.
The pair of first fitting protrusions 32a are disposed at positions facing each other, and similarly, the pair of second fitting protrusions 32b are also disposed at positions facing each other.

In the above configuration, the reclining main body 31 is partially fitted in the fitting hole 21 of the back frame 20 in a state where the left and right inner surfaces are in contact with and overlapped with the left and right outer surfaces of the back frame 20.
Further, as shown in FIG. 7, the first welding marks 60 are formed on the left and right inner surfaces of the back frame 20 by welding with the reclining body 31 assembled in the fitting holes 21 of the back frame 20. Yes. Details of the first welding mark 60 will be described later.

As shown in FIGS. 3 and 4, the rotation shaft 33 is disposed between the back frames 20 in a state where the axial direction is along the left-right direction of the seat, and the extending end portion of the rotation shaft 33 is the fitting hole 21. Through the outer surface of the back frame 20.
The extended end portion of the protruding rotation shaft 33 is assembled with the reclining main body 31 and further protrudes left and right through the shaft hole 11 of the cushion frame 10 at a position outside the reclining main body 31.
An operation lever 37 shown in FIG. 2 is attached to the extending end of the rotation shaft 33.

The urging spring 34 is a spiral spring that urges the back frame 20 toward the front side of the seat. When the state of the back frame 20 is in the unlocked state, the back frame 20 is centered on the rotating shaft 33 and the cushion frame 10 Energize to rotate to the side.
One end portion of the urging spring 34 is provided on the back frame 20 side and is latched by a spring locking member 35 extending to the left and right outer sides, and the other end portion is provided on the cushion frame 10 side and left and right outer sides. It is latched by the latching | locking part 12 extended to.

The spring locking member 35 is a substantially L-shaped sheet metal member that locks one end of the biasing spring 34.
The spring locking member 35 is provided to extend from the outer surface of the base 35a and the base 35a attached to the left and right outer surfaces of the back frame 20, and the locking portion 35b to which one end of the biasing spring 34 is locked. And is composed of.
On the outer surface of the base portion 35a, an assembly hole 36 for attaching to the back frame 20 with a fastening bolt is formed.
The locking portion 35b extends from the lower end portion of the base portion 35a to the left and right outer sides, and the extending portion is provided by being slightly bent toward the biasing spring 34 side. Further, a weld bead is formed on the surface of the locking portion 35b along the extending direction of the locking portion 35b.
Note that the locking portion 35b does not necessarily extend to the left and right outside from the lower end portion of the base portion 35a. For example, the locking portion 35b may extend from the upper end portion of the base portion 35a to the left and right outer sides. You may extend outside.

The assembly hole 36 corresponds to a processed portion, and is formed with two gaps in the front-rear direction of the seat. The assembly hole 36 faces the assembly hole 22 in a state where the base portion 35a is in contact with the left and right outer surfaces of the back frame 20. It is arranged at the position to do.
Further, as shown in FIG. 3, the base 35 a is welded to the periphery of the assembly hole 36 in a state where the base portion 35 a is in contact with the left and right outer surfaces of the back frame 20.

Traces

40 and 50 are formed. Details of the second welding marks 40 and 50 will be described later.

With the above configuration, the reclining device 30 can adjust the standing posture of the back frame 20 by rotating the back frame 20 in the front-rear direction of the seat about the rotation shaft 33.
At this time, as shown in FIG. 6, the spring locking member 35 rotates the back frame 20 when the back frame 20 rotates to the front of the seat up to a predetermined rotational position in the biasing direction of the biasing spring 34. In order to restrict the movement, it is arranged so as to abut against a movement restricting portion 13 which is a part of the cushion frame 10.
More specifically, of the spring locking member 35, the contact portion 35c at the front end portion of the locking portion 35b and the movement restricting portion 13 at the upper end portion at the rear end portion of the cushion frame 10 are arranged to contact each other. Has been.

As shown in FIG. 6, the spring locking member 35 comes into contact with the movement restricting portion 14 that is a part of the cushion frame 10 even when the back frame 20 is rotated rearward to the predetermined rotational position. Is arranged.
Therefore, the rotation range of the back frame 20 relative to the cushion frame 10 can be appropriately adjusted by adjusting the contact position.

<Formation position of second welding marks 40, 50>
Next, with respect to the second welding marks 40 and 50 formed by laser welding from the left and right inner sides of the back frame 20 in a state where the spring locking members 35 are in contact with the left and right outer surfaces of the back frame 20, FIG. This will be described with reference to FIG.
In addition, by the laser welding, a part of the back frame 20 is melted and joined to the spring locking member 35, and the joined portions become the second welding marks 40 and 50.

As shown in FIGS. 6 and 7, the second welding mark 40 has a substantially U shape, and is formed on the left and right inner surfaces of the back frame 20 so as to surround the assembly hole 36 a on the front side of the seat.
More specifically, the second welding mark 40 is a first weld formed between the assembly hole 36 a and the contact portion 35 c that contacts the movement restricting portion 13 of the cushion frame 10 in the spring locking member 35. Part 41, and a second welded part 42 and a third welded part 43 that extend from respective end parts in the extending direction of the first welded part 41 and are formed at positions sandwiching the assembly hole 36a. Yes.

The first welding portion 41 passes through two points of the assembly hole 36 a and the contact portion 35 c and extends in a direction orthogonal to the virtual plane F formed along the axial direction of the rotation shaft 33.
The second welded portion 42 and the third welded portion 43 are respectively continuous from the first welded portion 41 and extend in a direction orthogonal to the extending direction of the first welded portion 41.
The second welded portion 42 is formed closer to the locking portion 35 b than the third welded portion 43, and extends so as to be longer than the third welded portion 43.

Moreover, in the 2nd welding part 42 and the 3rd welding part 43, it forms so that the one end part on the opposite side to the 1st welding part 41 side may each become wide.
Specifically, the second welded portion 42 is formed with a bent welded portion 44 that is continuously bent from one end portion and extends so as to face the second welded portion 42.
Similarly, the third welded portion 43 is formed with a bent welded portion 45 that is continuously bent from one end portion and extends so as to face the third welded portion 43.
The bent welds 44 and 45 are formed so as to be bent toward the assembly hole 36a.

The second welding mark 40 is formed by laser welding at a time from the second welding portion 42 side through the first welding portion 41 to the third welding portion 43 side.
More specifically, the second welding mark 40 is formed by laser welding at a time from the bent welded portion 44 on the second welded portion 42 side to the bent welded portion 45 on the third welded portion 43 side.
Note that the second welding mark 40 may be formed by laser welding from the third welding portion 43 side toward the second welding portion 42 side.

As shown in FIG. 7, the second welding mark 50 has a substantially circular shape and is formed on the left and right inner surfaces of the back frame 20 so as to surround the assembly hole 36 b on the rear side of the seat.

In the above configuration, in general, in consideration of how the load is applied during the rotation operation of the back frame 20, the load is concentrated between the assembly hole 36a and the contact portion 35c in the spring locking member 35, and the spring A stress acts to peel the locking member 35 from the back frame 20.
Therefore, as described above, by forming the first welded portion 41, a portion where the load is concentrated in the spring locking member 35 can be locally reinforced by welding fixation.
In addition, as described above, by forming the second welded portion 42 and the third welded portion 43, it is possible to further reinforce the portion of the spring locking member 35 that is relatively easily loaded around the assembly hole 36a.

In the above configuration, it is known that the load is relatively dispersed around one assembly hole 36b of the spring locking member 35. Therefore, when the substantially circular second welding mark 50 is formed, the periphery of the assembly hole 36b can be reinforced evenly.

<Formation position of first welding mark 60>
Next, the first welding marks 60 formed by laser welding from the left and right inner sides of the back frame 20 in a state where the reclining body 31 is assembled to the left and right outer surfaces of the back frame 20 will be described with reference to FIG. .
In addition, by the laser welding, part of the back frame 20 and the reclining main body 31 is melted and joined to each other, and the joint portion becomes the first welding mark 60.

As shown in FIG. 7, the first welding mark 60 has a substantially circular shape, and extends continuously so as to surround the periphery of the fitting hole 21 and the fitting protrusion 32. 32 is formed so as to alternately pass through a portion in contact with 32 and a portion in which the side surfaces of the back frame 20 and the reclining body 31 are overlapped.
In other words, the first welding mark 60 is continuously formed on the same circumference passing through the outer peripheral edge of the fitting hole 21 and the outer peripheral edge of the fitting protrusion 32 around the rotation shaft 33.
In addition, in the formation position of the 1st welding mark 60, the part with which each side surface of the back frame 20 and the reclining main body 31 is piled up is on the outer periphery of the fitting hole 21, and contacts the fitting protrusion 32. It corresponds to the part that is not.

The first welding mark 60 starts from the outer peripheral edge of the first fitting protrusion 32a on the upper side, and in order, the second fitting protrusion 32b on the rear side of the sheet, and the first fitting protrusion on the lower side. 32a is formed by laser welding at a time so as to form a circular shape through the outer peripheral edge of each of the second fitting protrusions 32b on the front side of the seat.
The laser welding operation may start from any position of the first welding mark 60, and may be around the front side of the seat or around the back side of the seat.

With the above configuration, the first welding mark 60 is a simple circular welding mark as compared with the conventional case where the entire peripheral portion where the fitting hole 21 and the fitting protrusion 32 are in contact is welded. , Increase the efficiency of welding work. Because of its simple circular shape, variations in welding operations are suppressed, and costs can be reduced easily.
Moreover, the 1st welding trace 60 consists of a continuous circular shape, for example, compared with the case where multiple are formed discontinuously, the efficiency of welding operation improves. In general, since the starting point of the first welding mark 60 is likely to be cracked, the joint strength is higher when the first welding mark 60 is continuously extended.

Further, the first welding mark 60 includes a fitting portion where the fitting hole 21 and the fitting protrusion 32 are in contact with each other, and a overlapping portion where the side surfaces of the back frame 20 and the reclining body 31 are overlapped. The two members are welded in a composite manner.
Therefore, compared with the conventional case where the peripheral portion where the fitting hole 21 and the fitting protrusion 32 are in contact with each other is welded over the whole, it is possible to ensure the same mounting rigidity and the efficiency of the welding work. Can be significantly improved.

Furthermore, since the first welding marks 60 are formed by laser welding from the left and right inner sides of the back frame 20, it is possible to suppress interference with other components compared to the case of welding from the left and right outer sides. Moreover, since the first welding mark 60 is formed in a simple shape, interference can be further suppressed.
Furthermore, since the 1st welding mark 60 exists in the position which cannot be visually recognized from the outside, the design property of the vehicle seat S and a high-class feeling improve.

<Second Embodiment of Vehicle Seat>
Next, a second embodiment of the vehicle seat S will be described with reference to FIG.
In addition, the description which overlaps with the vehicle seat S mentioned above in the following description is abbreviate | omitted.
In the vehicle seat S according to the second embodiment, one assembly hole 36 is formed on the outer surface of the spring locking member 35, and a substantially U-shaped second welding mark 140 is formed so as to surround the assembly hole 36. The difference is that it is formed.
Further, a difference is that a pair of arc-shaped first welding marks 160 are formed on the left and right inner surfaces of the back frame 20.

The second welding mark 140 includes a first welding part 141, a second welding part 142, and a third welding part 143 that are formed between the assembly hole 36 and the contact part 35c in the spring locking member 35. And is composed of.
The first welding portion 141 passes through two points of the assembly hole 36 and the contact portion 35 c and extends in a direction orthogonal to the virtual plane F formed along the axial direction of the rotation shaft 33.
The second welded portion 142 and the third welded portion 143 are continuous from the first welded portion 141, respectively, and extend in a direction orthogonal to the extending direction of the first welded portion 141.
The second welded portion 142 is formed with a bent welded portion 144 that continuously bends from one end opposite to the first welded portion 141 and extends so as to face the second welded portion 142. .

The pair of first welding marks 160 are formed on the same circumference passing through the outer peripheral edges of the fitting hole 21 and the fitting protrusion 32 with the turning shaft 33 as the center. It is arranged at a position sandwiched between.

In the spring locking member 35, the locking portion 35b does not necessarily extend to the left and right outside from the lower end portion of the base portion 35a. For example, the locking portion 35b may extend to the left and right outside from the upper end portion or the center portion of the base portion 35a. good.

<Third Embodiment of Vehicle Seat>
Next, a third embodiment of the vehicle seat S will be described with reference to FIG.
In the vehicle seat S according to the third embodiment, the assembly holes 36a and 36b are formed on the outer surface of the spring locking member 35, and the second substantially U-shaped so as to surround each of the assembly holes 36a and 36b. The difference is that weld marks 240 and 250 are formed.
Moreover, the point which the substantially elliptical 1st welding trace 260 is formed in the right-and-left inner surface of the back frame 20 differs.

The first welded portion 241 of the second weld mark 240 passes through two points of the assembly hole 36a and the contact portion 35c and is orthogonal to the virtual plane F1 formed along the axial direction of the rotating shaft 33. It extends to.
The second welded part 242 and the third welded part 243 are respectively continuous from the first welded part 241 and extend in a direction orthogonal to the extending direction of the first welded part 241.

On the other hand, the first welded portion 251 of the second weld mark 250 passes through two points of the spring locking member 35, that is, the assembly hole 36b and the portion where one end of the biasing spring 34 is locked, and rotates. It extends in a direction orthogonal to a virtual plane F2 formed along the axial direction of the moving shaft 33.
The second welded portion 252 and the third welded portion 253 are continuous from the first welded portion 251 and extend in a direction orthogonal to the extending direction of the first welded portion 251.

As described above, since the second welding mark 250 is formed in the portion of the spring locking member 35 where the load is likely to concentrate relatively around the assembly hole 36b, it is locally reinforced by simple welding fixation. be able to.

A part of the first welding mark 260 is formed on the same circumference passing through the outer peripheral edges of the fitting hole 21 and the fitting protrusion 32 around the turning shaft 33, and a part thereof is the turning shaft 33. Is formed in the same elliptical shape that passes outside from the outer peripheral edge.
The first welding mark 260 starts from the outer peripheral edge of the first fitting protrusion 32a on the upper side, and in order, the first fitting on the outer side and the lower side of the second fitting protrusion 32b on the rear side of the seat. It is formed by laser welding so that it passes through the outer peripheral edge of the protrusion 32a and the outer side of the second fitting protrusion 32b on the front side of the seat so as to be substantially elliptical.

In general, in order to perform welding with the above configuration aiming at a portion where the fitting hole 21 and the fitting protrusion 32 are in contact with each other, relatively high accuracy is required. Even the portion where the first fitting protrusion 32a and the fitting hole 21 are in contact with each other only needs to be formed with high accuracy, and other portions can absorb some variation.
As a result, the efficiency of the welding operation is significantly improved.

<4th Embodiment of a vehicle seat>
Next, a fourth embodiment of the vehicle seat S will be described with reference to FIGS.
In the vehicle seat S according to the fourth embodiment, the spring locking member 135 is provided so as to project outward from the base portion 135a attached to the outer side surface of the back frame 20 and the upper end portion of the base portion 135a. 34 is different from that of FIG. 34 in that one end of 34 is locked.
Another difference is that, on the outer surface of the spring locking member 135, one assembly hole 136 for assembly bolts is formed, and a pair of second welding marks 340 are formed at positions sandwiching the assembly holes 136 therebetween. Yes.

The base portion 135a of the spring locking member 135 is attached to a recessed portion 20a that is partially depressed on the outer surface of the back frame 20, and the attachment rigidity to the back frame 20 is improved.
Further, the base portion 135a is formed to be curved along the upper ends of the reclining body 31 and the cushion frame 10, in other words, has a relief shape for suppressing interference between the reclining body 31 and the cushion frame 10. Have.

The locking portion 135b has a stepped shape, and extends outward from the upper end of the base portion 135a in the sheet width direction, and the extended portion is slightly bent downward toward the biasing spring 34 side. Yes.
Therefore, in the spring locking member 135, compared to the spring locking member 35 of the first embodiment, the locking portion distal end 135ba to which the biasing spring 34 is locked and the assembly hole 136 are closer to each other in the vertical direction. It is arranged at the position. As a result, the spring locking member 135 by the urging spring 34 can be reinforced against a torsional load that is to be peeled off from the back frame 20.

As shown in FIG. 11, each of the pair of second welding marks 340 has a substantially rectangular shape (enclosed shape), and is disposed at a position sandwiching the assembly hole 136 in the front-rear direction of the seat. The shape is in line. Further, the pair of second welding marks 340 are arranged at positions close to the outer periphery of the assembly hole 136. Therefore, it is possible to reinforce a portion of the spring locking member 135 that is relatively easily loaded around the assembly hole 136.

As shown in FIG. 11, the pair of second welding marks 340 is formed in a portion of the base portion 135 a of the spring locking member 135 that is positioned between the locking portion 135 b and the first welding mark 60 in the vertical direction. ing.
As described above, the second welding mark 340 is formed between the locking part 135b to which one end of the biasing spring 34 is locked and the first welding mark 60 for assembling the reclining body 31. Of the spring locking member 135, a portion where load is particularly likely to concentrate can be locally reinforced by welding.

The pair of second welding marks 340 have escape portions 341 for suppressing interference with the locking portions 135b in the vertical direction. In other words, the second welding mark 340 is disposed so as to avoid a portion of the base portion 135a that overlaps the locking portion 135b in the axial direction of the rotation shaft 33. Therefore, for example, even when laser welding is performed from the left and right outer sides of the back frame 20, the locking portion 135b has a shape that does not get in the way.
The escape portion 341 has a shape extending toward the rotation shaft 33 that connects the back frame 20 and the reclining body 31. Therefore, the connection rigidity between the back frame 20 and the reclining body 31 is improved.

<Other embodiments>
In the vehicle seat S of the above-described embodiment, the reclining device 30 that connects the back frame 20 corresponding to the second member to the cushion frame 10 corresponding to the first member so as to be relatively rotatable is illustrated.
However, it can be appropriately changed without being limited to the above. For example, the present invention can also be applied to a seat provided with a device for connecting the back frame 20 to the vehicle body floor side so as to be relatively rotatable, or connecting the cushion frame 10 to the vehicle body floor side so as to be relatively rotatable.
Further, the present invention can be applied to a seat provided with a device for connecting the seat body to the vehicle body floor side so as to be rotatable relative to the vehicle body floor side. On the other hand, the present invention can be applied to a sheet or the like that is connected to be relatively rotatable.

In the vehicle seat S of the above-described embodiment, as shown in FIG. 5, the fitting hole 21 corresponding to the fitted portion and the fitting protrusion 32 corresponding to the fitting portion are assembled.
However, without being limited to the above, for example, a configuration in which the fitting recess and the fitting projection are assembled, or a fitting hole and a fitting claw may be assembled. Reinforcing with bolts or an adhesive may be used.

Moreover, in the said embodiment, as shown in FIG. 3, although the assembly hole 36 is formed in the outer surface of the spring latching member 35 as a process part for attaching to the back frame 20, it is limited to this. And can be changed as appropriate. For example, an uneven portion or a welded portion may be formed instead of the assembly hole 36, or an adhesive portion to which an adhesive is applied may be formed.

Moreover, in the said embodiment, although the 1st welding trace 60 and the

2nd welding trace

40, 50 are formed by laser welding, it is not limited to this, Spot welding, ultrasonic welding, etc. instead of laser welding A known welding method in which a part of the base material is melted and joined may be appropriately employed.

Moreover, in the said embodiment, as shown in FIG. 7, although the 1st welding trace 60 is formed in substantially circular shape, it is not limited to this, It is substantially semi-elliptical shape, substantially rectangular shape like square shape. Of course, it may be formed in a polygonal shape or the like. The first welding mark 60 has a continuous circular shape, but is not limited thereto, and may be formed discontinuously.

Moreover, in the said embodiment, as shown in FIG. 7, although the 2nd welding trace 40 has each

welding part

41, 42, 43 formed continuously, it is not limited to this, each welding

part

41 , 42, 43 may of course be formed discontinuously.

Moreover, in the said embodiment, as shown to FIG. 10, FIG. 11, although a pair of 2nd welding trace 340 is each formed in the substantially rectangular shape, it can change without being limited to this.
For example, the second welding mark 340 may be formed in a substantially L shape, and may be disposed so as to avoid a portion overlapping the locking portion 135b in the axial direction of the rotation shaft 33.
Further, for example, the second welding mark 340 may be formed in a substantially U shape, and disposed so as to avoid a portion that overlaps the locking portion 135b in the axial direction of the rotation shaft 33.

In the above-described embodiment, a vehicle seat used for an automobile has been described as a specific example. However, the present invention is not limited to this, and it is also used as a vehicle seat for an airplane, a ship, etc., in addition to a vehicle seat for a train, a bus, etc. can do.

In the present embodiment, the vehicle seat S according to the present invention has been mainly described.
However, said embodiment is only an example for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

DESCRIPTION OF SYMBOLS S Vehicle seat Sa Vehicle seat frame 1 Seat cushion 2 Seat back 10 Cushion frame 11 Shaft hole 12

Locking part

13, 14 Movement control part 20 Back frame 20a Recess 21 Fitting hole 21a First fitting hole part 21b Second Fitting hole 22 Assembly hole 30 Reclining device 31 Reclining body (lock member)
32 fitting protrusion 32a first fitting hole 32b second fitting hole 33 rotating shaft 34 biasing

spring

35, 135

spring locking member

35a,

135a base

35b, 135b locking part 135ba locking part tip

35c Contact portion

36, 136

Assembly hole

36a, 36b Assembly hole 37

Operation lever

40, 140, 240, 340

Second weld mark

41, 141, 241

First weld portion

42, 142, 242

Second weld portion

43, 143, 243 First 3

welding parts

44, 45, 144 bending welding part 341

escape part

50, 250 second welding mark 251 first welding part 252 second welding part 253

third welding part

60, 160, 260 first welding mark (welding mark)
F, F1, F2 Virtual plane

Claims

A vehicle seat frame that is a skeleton of a vehicle seat,
A first member that is a component of the vehicle seat frame, and a second member that is coupled to the first member via a pivot shaft so as to be pivotable.
A locking member attached to the second member and locking the rotation of the second member,
On the surface of the lock member, a fitting portion is formed for assembling to the fitted portion provided on the surface of the second member.
By being welded in a state where the fitted portion and the fitting portion are assembled, a welding mark is formed on at least one surface of the second member and the lock member,
The weld mark is
It extends so as to surround the fitted portion and the fitting portion,
The vehicle is characterized in that it passes through a portion where the fitted portion and the fitting portion are in contact with each other and a portion where the surfaces of the second member and the lock member are overlapped. Seat frame.
2. The vehicle seat frame according to claim 1, wherein the weld mark extends continuously so as to surround the fitted portion and the fitting portion.
The first member is a cushion frame serving as a skeleton of a seating portion,
The second member is a back frame serving as a skeleton of a backrest portion,
The locking member is
A main body of a reclining device that connects the back frame to the cushion frame so as to be relatively rotatable,
The vehicle seat frame according to claim 1, wherein the vehicle seat frame is assembled to a side surface of the back frame in the seat width direction.
The vehicle seat frame according to claim 1, wherein the welding mark is formed in a substantially circular shape or a substantially elliptical shape.
The fitted portion is a fitting hole formed so as to penetrate the side surface in the sheet width direction of the second member,
The fitting portion is a fitting protrusion formed so as to protrude from a side surface of the lock member,
The vehicle seat frame according to claim 1, wherein the welding mark is formed on a side surface of the second member.
The fitting protrusions are a pair of first fitting protrusions arranged at positions sandwiching the rotating shaft in the vertical direction and a pair of second fittings disposed at positions sandwiching the rotating shaft in the seat front-rear direction. A mating protrusion,
The vehicle seat frame according to claim 5, wherein the welding mark extends so as to pass at least a portion where the pair of first fitting protrusions and the fitting hole are in contact with each other.
The weld mark extends so as to alternately pass through a portion where the fitting hole and the fitting protrusion are in contact with each other and a portion where the side surfaces of the second member and the lock member are overlapped. The vehicle seat frame according to claim 5, wherein the vehicle seat frame is provided.
The welding mark is a first welding mark,
An urging spring that urges the second member along the rotation direction about the rotation axis;
A spring locking member having a base attached to the second member, and a locking portion provided so as to protrude from the outer surface of the base, and one end side of the biasing spring locked.
By welding in a state where the base and the second member are in contact, a second welding mark is formed on at least one of the base and the second member,
2. The vehicle seat frame according to claim 1, wherein the second welding trace is disposed between the locking portion and the first welding trace.
9. The vehicle seat frame according to claim 8, wherein the second welding mark is disposed inside the outer peripheral portion of the base at the base.
The vehicle seat frame according to claim 8, wherein at least a part of the second welding mark is substantially linear.
The vehicle seat frame according to claim 8, wherein the second welding mark is substantially L-shaped.
9. The vehicle seat frame according to claim 8, wherein the second welding mark is substantially U-shaped.
On the outer surface of the base portion, a processed portion for attaching to the second member is formed,
The vehicle seat frame according to claim 8, wherein the second welding trace is disposed between the processed portion and an outer peripheral portion of the base portion in the base portion.
9. The vehicle seat frame according to claim 8, wherein the second welding mark is arranged so as to avoid a portion of the base portion that overlaps with the locking portion in an axial direction of the rotation shaft.
A vehicle seat comprising the vehicle seat frame according to claim 1 as a skeleton.