JP6057673B2 - Vehicle seat frame structure - Google Patents

Description

  The present invention relates to a vehicle seat frame structure in which a connecting rod (connecting pipe) is installed between left and right side members of a seat cushion frame.

A frame of a vehicle seat is required to have rigidity, and a frame structure is known in which a connecting pipe is installed between left and right side members and the left and right side members are connected to ensure the rigidity of the frame.
For example, in a seat cushion frame in which a front member (front frame) and left and right side members (side frames) are combined in a substantially U-shaped plane, the rear ends of the left and right side members are connected by a connecting rod. And formed into a substantially rectangular shape (for example, JP 2008-285103 A, JP 2011-218842 A). The connecting rod is usually formed from a pipe member having a circular cross section.

At the rear end of the side member of the seat cushion frame, a connecting hole for the connecting pipe (connecting rod) is formed. The left and right ends of the connecting pipe project from the mounting hole, and the end of the connecting pipe (the protruding end) is the left and right sides. It is welded (welded) to the member.
In this way, if the left and right ends of the connecting pipe are welded to the side members of the seat cushion frame, and the connecting pipe is installed and welded to the left and right side members, the seat cushion frame is integrated into a substantially rigid and substantially rectangular shape. A seat cushion frame is obtained. The welding (welding) of the connecting pipe to the side member is usually performed not on the entire circumference of the connecting pipe but on a part thereof.

JP 2008-285103 A JP 2011-218842 A

  A seat back is attached to the rear end of the seat cushion. When a rear collision, sudden stop, etc. (hereinafter referred to as “rear collision” as appropriate) occur, the load (impact load) due to the rearward inertial movement of the occupant, Specifically, that frame (seat back frame) receives. The seat back frame is formed in a substantially rectangular shape in the same manner as the seat cushion frame, and the reclining shaft, for example, extends through the lower ends of the left and right side members and the rear ends of the left and right side members of the seat cushion frame. Thus, the seat back frame and the seat cushion frame are connected. The impact load due to the rear impact is transmitted to the rear ends of the (left and right) side members of the seat cushion frame via the (left and right) side members of the seat back frame.

  It is necessary to absorb the energy of the impact load in order to suppress so-called whiplash damage caused by a sudden backward tilt of the head at the time of rear impact, and the seat back frame tilts backward under the impact load To absorb energy.

  The impact load transmitted from the seat back frame to the seat cushion frame acts intensively on the rear portions of the left and right side members to which the seat back is attached, particularly on the through portion (around the attachment hole) of the connecting pipe as a hole.

  Since the end of the connecting pipe is welded to the side member of the seat cushion frame, the welded state of the connecting pipe to the side member greatly affects the absorption of energy due to the deformation of the seat back frame. That is, when the left and right side members of the seat cushion frame are deformed under an appropriate resistance, the seat back frame is smoothly tilted backward to absorb the energy of the impact load.

  The welding strength (welding) of the connecting pipe to the side member of the seat cushion frame can be adjusted by the length of the weld bead in the circumferential direction of the connecting pipe. Conventionally, the length of the weld bead is specified by a specification drawing, a work drawing, or the like, and is welded around the connecting pipe so that the weld bead has a specified length at the work site. However, with such a designation of welding, it is difficult to reliably perform predetermined welding.

  An object of the present invention is to provide a frame structure for a vehicle seat that can reliably perform predetermined welding.

In the present invention, attention is paid to the fact that the start position of the weld bead is a major factor affecting the welding strength, and by providing a mark at the start position of the weld bead, welding with a constant start position of welding can be performed.
In other words, according to the first aspect of the present invention, the connecting pipe is constructed on the left and right side members of the seat cushion frame, and the left and right ends of the connecting pipe projecting from the left and right side members are welded to the side member. In the seat frame structure, two marks made of marking lines are provided side by side on the side member to indicate the starting point position of the weld bead as a range.

  In the present invention according to claim 1, welding is started on the basis of the mark, and the welding bead is extended by a certain length around the end (circumference) of the connecting pipe in a predetermined direction, whereby the welding start position is determined. Constant welding can be performed, and predetermined welding can be performed reliably.

1 is a perspective view of a vehicle seat incorporating a frame structure according to an embodiment of the present invention. The side view of the right side member of a seat cushion frame is shown.

  Connection pipes are installed at the rear ends of the left and right side members of the seat cushion frame, and the left and right ends of the connection pipes protruding from the side members are welded to the side members. Here, a mark indicating the start position of the weld bead is provided on the side member, and the connecting pipe is welded to the side member with reference to the mark. For example, the mark is a marking line stamped on the side member, and two marking lines are provided to indicate the starting point position of the weld bead as a range. Further, two marking lines may be provided to indicate the start position of the weld bead as a range, and a marking line indicated at the reference position may be further provided at the center of the two marking lines.

FIG. 1 is a perspective view of a vehicle seat incorporating a frame structure according to an embodiment of the present invention, and FIG. 2 is a side view of a left side member of the seat cushion frame.
As shown in FIG. 1, for example, the vehicle seat 10 includes a seat cushion frame 20 and a seat back frame 30 that is swingably attached to the seat cushion frame via a reclining device 32.

The seat cushion frame 20 has a structure in which two connecting rods are installed on the front and rear ends of left and right side members (side frames) 20L and 20R. That is, it is comprised in the planar substantially rectangular shape which connected between the front ends of the right-and-left side members 20L and 20R formed by pressing a steel plate, and between the rear ends with two connecting rods 22F and 22Re. The front and rear connecting rods 22F and 22Re are generally formed from a pipe material having a circular cross section, but are not necessarily limited to pipe materials having a circular cross section.
In the embodiment, a cover 20U is installed on the left and right side portions 20L and 20R so as to cover the connecting pipe (connecting rod) 22F in front of the seat back frame.

  In the embodiment, the vehicle seat 10 is embodied as a seat that can slide back and forth on the vehicle floor. That is, the upper rail 24U is slidably engaged with the left and right lower rails 24L fixed on the vehicle floor, and the seat cushion frame 20 is disposed between the left and right brackets 26 fixed on the upper rail.

  The front and rear connecting pipes (connecting rods) 22F, 22Re installed on the left and right side members 20L, 20R protrude through the mounting holes 20a formed in the side members, and the peripheral surfaces of the protruding ends And welded to the side member.

When a rear collision occurs, the seat back frame 30 receives a load (impact load) due to the backward inertial movement of the occupant. The seat back frame 30 is formed in a substantially rectangular shape like the seat cushion frame 20, and a reclining shaft 32 a extends through the lower ends of the left and right side members and the rear ends of the left and right side members of the seat cushion frame. The seat back frame and the seat cushion frame are connected to each other. Therefore, the impact load due to the rear impact is transmitted to the rear ends of the left and right side members 20L and 20R of the seat cushion frame via the (left and right) side members of the seat back frame 30.
The seat back frame 30 tilts backward while absorbing the rear end of the side members 20L and 20R of the seat cushion frame, and absorbs the energy caused by the impact of the rear impact, so that the head is sharply rearranged during the rear impact. Neck damage caused by tilting, so-called whiplash injury, is suppressed.

  In the present invention, the mark 40 that is the starting position of the weld bead for welding the connecting rod 22Re is provided on the side members 20L and 20R of the seat cushion frame. As shown in FIG. 2, the mark 40 is provided in advance in the side members 20L and 20R around the mounting holes 20a of the left and right side members through which the end of the connection pipe 22Re is inserted. The mark 40 is, for example, a line (marking line) stamped on the side member by marking.

  The welding requirements such as the direction in which the weld bead W extends from the welding start position and the length of the weld bead (welding length) are the shape and structure of the side member of the seat cushion frame, and the relative height of the connecting pipe 22Re with respect to the vehicle floor. It is set for each vehicle type in consideration of the design factors such as, and is instructed to the work site with a specification drawing, a work drawing and the like. At the work site, the connecting pipe is protruded from the mounting hole 20a and the seat cushion frame 20 is temporarily assembled. Then, the marking line 40 is used as the starting point, and the welding bead W is moved in a predetermined direction according to the specification drawing. The connecting pipe is welded to the side member by extending a certain length, and the seat cushion frame is integrated.

  In this way, at the work site, welding is started with reference to the marking line (mark) 40, and the weld bead is extended by a certain length around the end (circumference) of the connecting pipe, and the side member 20L. , 20R is welded to the connecting pipe 22Re. In this welding, the welding start position is constant, and predetermined welding according to a specification diagram or the like can be reliably performed. And since the start position of welding can be confirmed easily visually, the certainty of a subsequent test | inspection improves further.

As shown in FIG. 2, if two marking lines (marks) 40 are provided and the starting position of the weld bead is indicated in a range, that is, if the allowable range is clearly indicated, welding can be performed more easily and high workability can be achieved. Original welding can be easily performed. If the marking line 40c shown at the reference position is further provided at the center of the two marking lines, the starting point position of the welding bead W can be made more accurate and constant, and predetermined welding can be performed with high accuracy.
Usually, the two marking lines 40a and 40b are provided in parallel, but radiation extending from the axial center of the connecting pipe may be used.

  Although the welding of the connecting pipe 22Re to the left side member 20L has been described, a similar marking line (mark) 40 is provided on the right side member 22R, and the connecting pipe Re is welded based on the marking line. Needless to say.

  For example, it is preferable that the distance between the left and right marking lines 40a, 40b from the center marking line 40c is approximately 3 mm, and the welding start point range defined by the two marking lines 40a, 40b is approximately 6 mm.

  If the mark 40 that is the starting point position of the weld bead is a marking line, it can be easily seen without disappearing. Although it is preferable to use the marking line as the mark 40, the marking line is not limited to the marking line as long as it is easily visible without disappearing.

  In the embodiment, the rear connecting pipe 22Re is welded (welded) to the side member 20L under two discontinuous weld beads W, and a combination of the marking lines 40a, 40b, and 40c is attached. Two sets are provided around the hole 20a, and the weld beads are extended in different directions from the center marking line 40c. However, as described above, the number of welding locations, the direction of the weld bead W, the length, and the like are based on an instruction such as a specification diagram, and are not limited thereto.

  The welding (welding) of the rear connection pipe 22Re to the side members 20L and 20R greatly affects the absorption of energy at the time of the rear impact, and the welding of the front connection pipe 22F does not affect so much. Therefore, it is not necessary to provide a mark (welding line) 40 for welding around the mounting hole of the previous connecting pipe 22F and perform welding under the mark.

  However, in the embodiment, the front connection pipe 22F is also welded under the marking line (mark), and the side member 20L is formed around the mounting hole 20a of the front connection pipe 22F in the same manner as in the rear connection pipe 22Re. In addition, there are provided two sets of left and right marking lines 40a and 40b that define the range and a mark having a marking line 40c at the center thereof. And the connection pipe 22F is welded to the side members 20L and 20R by extending the weld beads W in different directions.

  As described above, according to the present invention, since the mark is provided at the start position of the weld bead, welding is started with the mark as a reference, and the weld bead is rotated around the end of the connecting pipe (circumference) in a predetermined direction. By extending the length by a certain length, the welding start position becomes constant, and predetermined welding can be performed reliably.

The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention in any way, and all modifications and alterations made within the technical scope of the present invention are included in the present invention. Needless to say.
For example, in the embodiment, the seat cushion frame is configured in a substantially rectangular shape by laying two connecting pipes between the front and rear ends of the left and right side members of the seat cushion frame. However, the present invention also applies to the seat cushion frame in a substantially rectangular shape by laying only the rear connecting pipe on the side member of the seat cushion frame in which the front member (front frame) and the left and right side members are combined in a substantially U shape. Can be adopted.
In addition, a connecting pipe having a circular cross section is usually used as the connecting rod, but the connecting rod may be formed from a pipe other than the pipe having a circular cross section.

  Although the present invention is suitable for a vehicle seat such as an automobile, the seat of an airplane, a ship, a train, or the like that may cause neck damage (whipping failure) due to a sudden backward tilt of the head due to a sudden stop. Can also be applied.

10 Vehicle Seat 20 Seat Cushion Frame 20L, 20R Left and Right Side Members (Side Frame)
20a (connection pipe) mounting holes 22F, 22Re Front and rear connection rods (connection pipe)
30 Seat back frame 40 (40a, 40b, 40c) Mark (marking line)
W weld bead

Claims (3)

  In the frame structure of a vehicle seat in which connecting pipes are installed on the left and right side members of the seat cushion frame, and the left and right ends of the connecting pipe protruding from the left and right side members are welded to the side members, the mark made of the marking line is the side A frame structure of a vehicle seat in which two are arranged side by side and the start position of a weld bead is shown in a range.   In the frame structure of a vehicle seat in which connecting pipes are installed on the left and right side members of the seat cushion frame, and the left and right ends of the connecting pipe protruding from the left and right side members are welded to the side members, the mark made of the marking line is the side A frame structure for a vehicle seat in which two are arranged side by side to indicate a starting point position of a weld bead in a range, and a marking line indicating a reference position is further provided at the center of the two marking lines. 3. The vehicle according to claim 2 , wherein two sets of two marking lines indicating the starting point position and a marking line indicating a reference position provided at the center of the two marking lines are provided apart from each other. The frame structure of the seat.

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