CN214728327U

CN214728327U - Vehicle seat

Info

Publication number: CN214728327U
Application number: CN202120217090.5U
Authority: CN
Inventors: 中村满久
Original assignee: Tachi S Co Ltd
Current assignee: Tachi S Co Ltd
Priority date: 2020-04-07
Filing date: 2021-01-26
Publication date: 2021-11-16
Anticipated expiration: 2031-01-26

Abstract

A vehicle seat having high strength efficiency and a reduced number of parts in the connection of a pad side frame and a back side frame. The vehicle seat includes a seat cushion and a seat back tiltably coupled to the seat cushion via a back angle adjustment mechanism. The seat back includes a seat back frame. The seat back frame includes a back side frame, and the seat cushion includes a seat cushion frame portion. The seat cushion frame portion includes a cushion-side frame body; and a first mounting component for mounting the pad-side frame body to the backrest-side frame via the backrest angle adjusting mechanism. The first mounting component has a first opening formed in a closed cross-section, and the rear end portion of the pad-side frame body is fitted into the first opening of the first mounting component and welded thereto.

Description

Vehicle seat

Technical Field

The present invention relates to a vehicle seat, and more particularly to a technique effectively applied to a vehicle seat having a cushion side frame.

Background

A seat frame of a vehicle seat is configured by a seat cushion frame and a seat back frame. The seat cushion frame includes a cushion side frame, and the seat back frame includes a back side frame.

Among vehicle seats provided with a backrest angle adjusting device, a vehicle seat provided with a coupling bracket that couples a backrest side frame and a cushion side frame has been proposed (see, for example, japanese patent application laid-open No. 2019-172272).

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2019-172272

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

According to the present invention, it has been found that the coupling bracket is formed of an open cross section, and is easily deformed in response to a torsional input, and the strength efficiency of the constant cross section is poor. Further, it is known that since the connecting bracket is fastened and connected by fastening and connecting parts such as a bolt and a nut and the like and the side frame of the gasket, the number of parts is large, the number of assembling steps is increased, and the weight cannot be reduced.

The utility model aims at providing a in the connection of liner side frame and back side frame, intensity is efficient, and can reduce the technique of part quantity.

Other problems and novel features will become apparent from the description and drawings of the present specification.

Means for solving the problems

A brief description of an outline of a typical vehicle seat according to the present invention will be given below.

A vehicle seat includes a seat cushion and a seat back tiltably coupled to the seat cushion via a back angle adjustment mechanism, the seat back including a seat back frame including a back side frame, the seat cushion including a seat cushion frame including a cushion side frame body; and a first mounting part for mounting the pad-side frame body to the back-side frame through the back angle adjustment mechanism, wherein the first mounting part has a first opening portion formed in a closed cross-section, and a rear end portion of the pad-side frame body is fitted into the first opening portion of the first mounting part and welded thereto.

Effect of the utility model

According to the vehicle seat described above, unnecessary weight increase is not performed in the connection of the cushion-side frame and the back-side frame, the strength and the like can be effectively improved, the strength efficiency is high, and the number of parts can be reduced.

Drawings

Fig. 1 is a perspective view showing a vehicle seat according to an embodiment.

Fig. 2 is a perspective view showing a seat frame of the vehicle seat of fig. 1.

Fig. 3 is a perspective view showing a configuration example of the gasket side frame portion.

Fig. 4 is a perspective view showing the cushion side frame body.

Fig. 5 is a perspective view illustrating the structure of the pad side frame body.

Fig. 6 is a front view and a sectional view of the cushion-side frame body.

Fig. 7 is a plan view and a side view of the pad-side frame body.

Fig. 8 is a developed perspective view illustrating assembly of the left cushion side frame body and the first attachment member of the left cushion side frame portion, the backrest angle adjusting mechanism, and the left backrest side frame.

Fig. 9 is a perspective view showing the first mounting component.

Fig. 10 is a front view showing the first mounting component.

Fig. 11 is a sectional view of the first mounting part taken along line D-D of fig. 10.

Fig. 12 is a rear perspective view of the cushion side frame body, the first mounting component, and the assembled shape.

Detailed Description

In order to implement the utility model

Embodiments of the present invention will be described below with reference to the drawings.

The disclosure is merely an example, and the drawings schematically show the width, thickness, shape, and the like of each part as compared with the actual form in order to clarify the description, but the drawings do not limit the explanation of the present invention. In the present specification and the drawings, the same elements as those described above are denoted by the same reference numerals in the already-shown drawings, and detailed description thereof may be omitted as appropriate. In the drawings, the front of the arrow indicates the front of the vehicle, the rear of the arrow indicates the rear of the vehicle, the left of the arrow indicates the left side of the vehicle, the right of the arrow indicates the right side of the vehicle, the upper of the arrow indicates the upper of the vehicle, and the lower of the arrow indicates the lower of the vehicle. In addition, in the following description, unless otherwise specified, with respect to front, rear, upper, lower, left, and right, it means front, rear, upper, lower, left, and right with respect to the vehicle.

Examples

(integral structure of vehicle seat)

Fig. 1 is a perspective view showing a vehicle seat according to an embodiment. Fig. 2 is a perspective view showing a seat frame of the vehicle seat of fig. 1.

As shown in fig. 1, a vehicle seat 1 is configured by combining a seat cushion 2 and a seat back 3. The seat cushion 2 constitutes a seating surface, and the seat back 3 constitutes a seat back. The vehicle seat 1 has a backrest angle adjusting function that can adjust the angles of the seat cushion 2 and the seat back 3, and the seat cushion 2 and the seat back 3 are tiltably coupled by the backrest angle adjusting function.

A headrest 4 is provided at an upper end portion of the seat back 3. The left and right sides below the seat cushion 2 are coupled to a pair of left and right seat rails 5 that support the seat cushion 2 so as to be movable (slidable) in the front-rear direction.

A vehicle seat 1 shown in fig. 1 shows a vehicle seat including a left seat and a center seat of a rear seat in this example. The vehicle seat 1 may be a right seat side seat of a rear seat, a driver seat side seat of a front seat, or an assistant seat side seat.

Fig. 2 shows a seat frame 6 of the vehicle seat 1 shown in fig. 1, from which a pad material and a seat skin have been removed. The seat frame 6 has a seat cushion frame (hereinafter also referred to as a cushion frame) 7 and a seat back frame (hereinafter also referred to as a back frame) 8. The back frame 8 is connected to the cushion frame 7 so as to be tiltable by a back angle adjusting mechanism 9.

The cushion frame 7 is configured by combining a right cushion side frame portion 71, a left cushion side frame portion 72, a front pipe frame 73, right and left brackets 74 connected to right and left sides of the front pipe frame 73, and a rear pipe frame 75 into a frame shape. The front pipe frame 73 is connected between a front portion of the right cushion side frame 71 and a front portion of the left cushion side frame 72 via right and left brackets 74. The rear pipe frame 75 is connected between a rear portion of the right cushion side frame 71 and a rear portion of the left cushion side frame 72.

The right pad side frame portion 71 is constituted by a right pad side frame main body 711, a right first attachment part 712, and an upright plate 713. Riser 713 also functions as bracket 74.

The left cushion side frame portion 72 is constituted by a left cushion side frame body 721, a left first mounting part 722, and an upright plate 723. Riser 723 serves the function of bracket 74.

The right gasket side frame body 711, the right first attachment part 712 and the upright plate 713, the left gasket side frame body 721, the left first attachment part 722 and the upright plate 723 are formed in a shape substantially symmetrical with respect to the left-right center line CL of the gasket frame 7.

The back frame 8 is formed by combining a right back side frame 81, a left back side frame 82, a lower tube frame 83, and an upper tube frame 84 into a frame shape. The down tube frame 83 is connected between a lower portion of the right back side frame 81 and a lower portion of the left back side frame 82. The left and right end portions of the upper tube frame 84 are connected to the upper end portions of the right back side frame 81 and the left back side frame 82.

Each of the pair of right and left seat rails 5 is constituted by a lower seat rail 51 fixedly provided on a floor (not shown) of the vehicle and an upper seat rail 52 slidably supported on the lower seat rail 51. The lower portion of the right cushion side frame 71 is fixed to the right upper seat rail 52, and the lower portion of the left cushion side frame 72 is fixed to the left upper seat rail 52.

(example of the constitution of the cushion side frame)

Fig. 3 is a perspective view showing a structural example of the cushion side frame. Fig. 3 shows the left cushion side frame portion 72 and the left back side frame 82 as a representative example. Although not shown, the right pad side frame portion 71 and the right backrest side frame portion 81 are symmetrical with respect to the left pad side frame portion 72 and the left backrest side frame portion 82 in fig. 3, and have the same configuration.

The left gasket side frame portion 72 is formed by combining a gasket side frame body 721, a first mounting component 722 welded and connected to the rear of the gasket side frame body 721 by laser welding, and an upright plate 723 welded and connected to the front lower portion of the gasket side frame body 721 by laser welding. The first mounting part 722 and the upright 723 can also be referred to as a first bracket 722 and a second bracket 723. The upper portion of the first mounting component 722 is coupled to the lower end portion of the left back side frame 82 via the back angle adjusting mechanism 9.

The rear portion of the pad side frame main body 721 is explained with reference to fig. 8, which will be described later, but has the following structure: the rear portion of the pad side frame body 721 and the first mounting part 722 are fitted into the first mounting part 722 having a closed cross section and welded by laser welding.

In fig. 3, although not shown, bracket 74 described with reference to fig. 2 is provided on the right side of riser 723. That is, the upright plate 723 has an コ -shaped (or U-shaped) shape that opens upward, and has a structure in which the right side surface also functions as the bracket 74. Further, the following structure is made: the front part of the side frame body 721 is embedded in the コ -shaped upward opened vertical plate 723, and is connected by welding using laser welding.

The opening H1 is formed by the pad-side frame body 721 and the first mounting component 722, the rear tube frame 75 is fitted into the opening H1, and the end of the rear tube frame 75 and the first mounting component 722 are fixed by welding or the like.

The opening H2 is formed below the left back side frame 82, the down tube frame 83 is fitted into the opening H2, and the end of the down tube frame 83 and the left back side frame 82 are fixed by welding or the like.

(example of Structure of cushion side frame body)

Next, a configuration example of the left pad-side frame body 721 will be described as a representative example with reference to fig. 4 to 7. Fig. 4 is a perspective view showing the cushion side frame body. Fig. 5 is a perspective view illustrating the structure of the pad side frame body. Fig. 6 is a front view and a sectional view of the cushion-side frame body. Fig. 7 is a plan view and a side view of the pad-side frame body.

As shown in fig. 4, the cushion-side frame body 721 is composed of an upper surface portion 41, a lower surface portion 42 opposed to the upper surface portion 41, a first side surface portion (right side surface portion) 43 provided between the upper surface portion 41 and the lower surface portion 42, and a second side surface portion (left side surface portion) 44 opposed to the first side surface portion 43. The first side surface portion 43 and the second side surface portion 44 are provided with a first opening H1 and a third opening H3. The third opening H3 corresponds to a portion to which a belt anchor (not shown) for attaching a seat belt buckle (not shown) is fixed. The reinforcing member 724 is fixed by welding between the third openings H3 provided in the first side surface portion 43 and the second side surface portion 44. The reinforcing member 724 is a cylindrical metal pipe having a space formed therein. The reinforcement member 724 can also be referred to as a washer (Collar) portion or Collar portion. By providing the reinforcing member 724 between the third openings H3, the webbing fixing portion includes the reinforcing member 724 against the input of a force that pulls up the seat belt buckle diagonally upward, and therefore, the breakage of the closed cross section can be prevented.

In the pad-side frame body 721, as described with reference to fig. 6, a portion surrounded by the upper surface portion 41, the lower surface portion 42, the first side surface portion 43, and the second side surface portion 44 has a closed cross-sectional structure.

As described with reference to fig. 5 and 6, the pad side frame body 721 has the following structure: a plate material (sheet metal) using one piece of a tailor welded material produced by a Tailor Welding (TWB) technique is press-formed, terminal portions are butted, and the butted portions are joined by welding to form a closed cross section. The tailor welded material is a plate material in which end faces of two (or more) flat metal plates having different thicknesses (plate thicknesses) are welded while abutting against each other.

As shown in fig. 5, a broken line L1 showing the upper end of the first side surface portion 43 and a broken line L1 showing the upper end of the second side surface portion 44 are portions where the end surfaces of two flat metal plates having different thicknesses are welded to each other. The upper side of the broken line L1 is a region R1 made of a thick metal plate (T1), and the lower side of the broken line L1 is a region R2 made of a thin metal plate (T2) (T2 < T1).

Fig. 6 (a) shows a front view of the cushion-side frame body 721, fig. 6 (B) shows a cross-sectional view of the cushion-side frame body 721 taken along the line B-B of fig. 6 (a), and fig. 6 (C) shows a cross-sectional view of the cushion-side frame body 721 taken along the line C-C of fig. 6 (a). The first portion P1 shown in fig. 6 (a) shows a portion of the cushion-side frame body 721 where the lower face portion 42 is provided. On the other hand, the second portion P2 represents a portion where the lower surface portion 42 is not provided and the lower side is open. That is, the cushion-side frame body 721 is configured such that the lower side of the first side surface part 43, the lower side of the second side surface part 44, and the lower surface part 42 are partially cut away (provided with a cut-out part) at the rear end part of the cushion-side frame body 721 indicated by the second part P2.

That is, the region of the first portion P1 corresponds to the region of the cushion-side frame body 721 that is closed-sectioned.

As shown in fig. 6B, the upper side of the broken line L1 is made of a thick metal plate (T1), and the lower side of the broken line L1 is made of a thin metal plate (T2) (T2 < T1). That is, the upper surface portion 41 and the first side surface portion 43 are formed of a metal plate having a thick plate thickness (T1) at a portion above the broken line L1 and at a portion above the broken line L1 of the second side surface portion 44. The portion of the first side surface portion 43 below the broken line L1 and the portion of the second side surface portion 44 below the broken line L1 are each formed of a metal plate having a small plate thickness (T2) (T2 < T1).

That is, the plate thickness (T1) of the upper surface portion 41 is made thicker than the plate thicknesses (T2) of the lower surface portion 42, the first side surface portion 43, and the second side surface portion 44 (T1 > T2). The plate thicknesses (T1) of the upper end of the first side surface portion 43 and the upper end of the second side surface portion 44 are made to be the same as the plate thickness (T1) of the upper surface portion 41.

Between the third openings H3 provided in the first side surface portion 43 and the second side surface portion 44, a reinforcing member 724 is provided. The lower surface portion 42 is not provided below the first side surface portion 43 and the second side surface portion 44, and is open.

As shown in fig. 6 (C), a lower surface portion 42 is provided below the first side surface portion 43 and the second side surface portion 44, and the upper surface portion 41, the lower surface portion 42, the first side surface portion 43, and the second side surface portion 44 are formed into a closed cross section. Similarly to fig. 6B, the upper side of the broken line L1 is made of a thick metal plate (T1), and the lower side of the broken line L1 is made of a thin metal plate (T2) (T2 < T1). The lower surface portion 42 is formed in an arc shape in this example.

When the lower surface portion 42 has an arc shape, the first side surface portion 43 and the second side surface portion 44 can be pressed by a jig, and the alignment accuracy can be ensured for welding the ends of the upper surface portion 41 in contact with each other. On the other hand, when the lower surface portion 42 is arc-shaped, since a flat surface cannot be secured, the upright plate 723 is required to fix the upper seat rail. However, since the strength of the cushion side frame body 721 is high, the upright plate 723 can be formed of a simple コ -shaped cross section.

Fig. 6 (D) shows a modification of the shape of the lower surface portion 42, and in this example, the lower surface portion 42 is not formed in an arc shape but in a linear shape. That is, the entire cross-sectional shapes of the upper surface portion 41, the lower surface portion 42, the first side surface portion 43, and the second side surface portion 44 are formed into closed cross-sectional shapes having rectangular shapes (or rectangular shapes) with rounded corners. The other structure of fig. 6 (D) is the same as that of fig. 6 (C), and therefore, a repetitive description thereof will be omitted.

When the lower surface portion 42 has a linear shape, the first side surface portion 43 and the second side surface portion 44 are pressed by a jig, and it may be difficult to ensure alignment accuracy for welding the end portions of the upper surface portion 41 in contact with each other. However, when the lower surface portion 42 is linear, a flat surface can be secured, and thus the upper seat rail can be easily fixed.

In fig. 6 (B), (C), and (D), a broken line L2 showing the upper surface portion 41 indicates a welding portion where end surfaces of the plate-shaped tailor welded material are butted against each other and welded. That is, in this example, in the plate-shaped tailor welded material, the end face of the metal plate with the thick plate thickness (T1) and the end face of the metal plate with the thick plate thickness (T1) are abutted in the portion of the broken line L2, and welding is performed using laser welding. The dashed line L2 represents the weld path.

Fig. 7 shows the shape of a number of dashed lines L2 representing the weld path. In fig. 7, (a1), (a2), (A3) show plan views, and each of (B1), (B2), and (B3) shows a front side view corresponding to each of (a1), (a2), and (A3).

As shown in (a1) and (B1) of fig. 7, the welding path indicated by the broken line L2 is linear. The shapes of the end face of the metal plate with the thick plate thickness (T1) and the end face of the metal plate with the thick plate thickness (T1) can be simplified, and the welding speed by laser welding can be increased, so that the welding time can be shortened.

As shown in fig. 7 (a2) and (B2), the welding path indicated by the broken line L21 has a crank-like shape with the corner portions thereof being substantially perpendicular. As shown in fig. 7 (a3) and (B3), the welding path indicated by the broken line L22 has a zigzag shape like a zigzag. The lengths of the welding paths of broken lines L21 and L22 shown in (a2), (B2), (A3), and (B3) of fig. 7 are longer than the lengths of the welding paths of broken line L2 shown in (a1) and (B1) of fig. 7, and therefore the strength of the welded portion can be improved. However, since the welding path is long, the welding time is long. Therefore, it is preferable to determine the welding path in consideration of the strength of the welded portion and the welding time. The welding path is not limited to the broken lines L2, L21, and L22 shown in fig. 7. The welding paths shown by the broken lines L2, L21, and L22 are straight lines or a combination of straight lines, but the welding paths may be curved.

In the following, the effect of the left pad-side frame body 721 will be described as a representative example, but the same effect will be obtained with the right pad-side frame body 711.

1) Since the pad-side frame main body 721 is formed with a closed cross section strongest against the torsional input, the plate thickness can be reduced, and the weight can be reduced. When the closed cross section is formed, the second axial moment of the cross section increases, and the rigidity against torsional deformation increases significantly compared to the open cross section. As a result, even with the same rigidity, the plate thickness of the pad-side frame main body 721 can be reduced as compared with the open cross section. Even if the cross section is closed, the advantages of the gasket side frame main body are reduced if the plate thickness and the cross section are increased, but the required cross section and plate thickness can be optimized in the gasket side frame main body 721, and as a result, the weight of the gasket side frame main body 721 can be reduced.

2) The upper surface portion 41 of the pad-side frame body 721, the portion of the first side surface portion 43 above the broken line L1, and the portion of the second side surface portion 44 above the broken line L1 are formed by a metal plate having a plate thickness (T1). Therefore, buckling deformation of the cushion-side frame body 721 can be prevented with respect to the rotational torque input in the front-rear direction from the backrest angle adjusting mechanism 9.

3) Since the reinforcing member 724 is provided at the connecting portion of the belt anchor portion of the cushion-side frame body 721, it is possible to prevent the collapse of the closed cross section in the cushion-side frame body 721 with respect to the input pulled obliquely upward from the seat belt buckle.

4) Since the number of parts of the pad-side frame body 721 is reduced, the number of assembly steps of the pad-side frame body 721 can be reduced.

(example of the first mounting part)

Next, a configuration example of the first mounting component 722 will be described with reference to fig. 8 to 11. Fig. 8 is an expanded perspective view illustrating assembly of the left cushion side frame body 721 and the first mounting part 722 of the left cushion side frame portion 72, the backrest angle adjusting mechanism 9, and the left backrest side frame 82. Fig. 9 is a perspective view showing the first mounting part 722. Fig. 10 is a front view showing the first mounting part 722. Fig. 11 is a sectional view of the first mounting part 722 taken along the line D-D of fig. 10.

As shown in fig. 8, the first mounting component 722 is formed by press-molding a metal plate, and is configured by fitting both ends of the metal plate as half-folded, and welding and joining the metal plate by laser welding to form a closed cross section. Therefore, the first mounting component 722 has the opening portion H10 formed in a closed cross section. The rear end portion of the gasket-side frame body 721 is fitted into the opening portion H10 of the first mounting component 722 so that the opening portions H1 and H3 of the gasket-side frame body 721 and the opening portions H1 and H3 of the first mounting component 722 overlap each other, and is welded by laser welding.

An opening H11 is provided in the upper portion of the first mounting component 722, and an opening H12 is provided in the lower portion of the left back side frame 82. The back angle adjustment mechanism 9 is fitted between the opening H11 and the opening H12, and couples the left back side frame 82 and the first attachment fitting 722. Thus, the left back side frame 82 is tiltably coupled to the left cushion side frame main body 721.

Although not shown, the right cushion side frame portion 71 and the right backrest side frame portion 81 are symmetrical with respect to the left cushion side frame portion 72 and the left backrest side frame portion 82 in fig. 8, and have the same configuration.

As shown in fig. 9, the first attachment member 722 has a right side surface 91, a left side surface 92 facing the right side surface 91, a lower surface 93 provided between the right side surface 91 and the left side surface 92, and an upper surface 94 facing the lower surface 93. The upper surface portion 94 is provided between the lower end of the left side surface portion 92 and the upper end of the left side surface portion 92. In the first mounting component 722, a portion surrounded by the right side surface portion 91, the left side surface portion 92, the lower surface portion 93, and the upper surface portion 94 has a closed cross-sectional structure. The first mounting component 722 has a structure in which a plate material using one piece of a tailor welded material produced by a tailor welding technique is press-formed, terminal end portions are butted, and butted portions are joined by welding to form a closed cross section.

In fig. 9 and 10, a broken line L3 showing the lower end portion of the left side surface portion 92 shows a portion where end surfaces of two flat metal plates having different thicknesses are welded to each other. Of the left side surface portion 92, the left side surface portion 92 on the upper side of the broken line L3 is a region R3 made of a thick metal plate (T3), and the left side surface portion 92 on the lower side of the broken line L3 is a region R4 made of a thin metal plate (T4 < T3). As shown in fig. 9, the right side surface portion 91, the lower surface portion 93, and the upper surface portion 94 are formed of a metal plate having a small plate thickness (T4) (T4 < T3). A metal plate having a thick plate thickness (T3) and a metal plate having a thin plate thickness (T4) are bonded to the upper side of the upper surface portion 94. That is, a region R5 at the upper end of the left side surface portion 92 on the upper side of the upper surface portion 94 is formed by bonding a metal plate having a large plate thickness (T3) and two metal plates having a small plate thickness (T4), and the strength and rigidity are improved. In the region R5 where the metal plate having a large thickness (T3) and the metal plate having a small thickness (T4) are bonded and the rigidity thereof is increased, an opening H11 into which the backrest angle adjusting mechanism 9 is fitted is provided.

In fig. 10, a third portion P3 represents a portion of the first mounting part 722 where the lower face 93 is provided. On the other hand, the fourth portion P4 shows a portion where the lower surface 93 is not provided and the lower side is open. In the fourth portion P4, the lower sides of the right side surface 91 and the left side surface 92 are partially cut away.

In the fourth portion P4, the lower side of the right side surface portion 91 and the lower side of the left side surface portion 92 of the first mounting component 722 are partially cut away, and as described with reference to fig. 6 a, in the second portion P2, the lower side of the first side surface portion 43 and the lower side of the second side surface portion 44 of the pad side frame body 721 are partially cut away (cut-away portions).

In this way, since the first attachment part 722 and the cushion side frame main body 721 are partially cut away, the length of the entire upper seat rail 52 can be reduced when the cushion side frame main body 721 and the first attachment part 722 are combined. In addition, the size of a stopper (not shown) that prevents the upper seat rail 52 from opening can also be reduced. Therefore, the entire weight of the seat frame 6 including the upper seat rail 52 and the stopper can be reduced.

Fig. 11 shows a cross-sectional view of the first mounting part 722 taken along line D-D of fig. 10. A double dotted line shown in fig. 11 shows a cross-sectional view of the side frame main body 721 combined by being inserted into the opening H10 of the first attachment member 722.

As shown in fig. 11, the left side surface 92 on the upper side of the broken line L3 shown in fig. 10 is formed of a metal plate having a large plate thickness (T3), and the left side surface 92 on the lower side of the broken line L3 is formed of a metal plate having a small plate thickness (T4). The outer surface 921 of the left side surface portion 92 is a flat surface, and the inner surface 922 of the left side surface portion 92 has a step difference corresponding to the plate thickness difference (T3-T4) in the portion indicated by the broken line L3. By making the outer surface 921 of the left side surface portion 92 flat, concentration of stress can be prevented. Further, by forming the outer surface 921 of the left side surface portion 92 to be a flat surface, even if the welding positions at which the end surfaces of two flat metal plates having different thicknesses are abutted against each other and welded are slightly different, this is not particularly problematic.

The first side surface portion 43 and the second side surface portion 44 of the pad side frame main body 721 are inserted into the opening H10 so as to be in contact with the inner surface 912 of the right side surface portion 91 and the inner surface 922 (inner surface of the thick portion) of the left side surface portion 92 of the first mounting component 722. The lower surface portion 42 of the pad side frame main body 721 may be in contact with the inner surface 932 of the lower surface portion 93 of the first mounting component 722, or the lower surface portion 42 and the inner surface 932 may be slightly separated (a space may be provided between the lower surface portion 42 and the inner surface 932).

Fig. 12 is a rear perspective view illustrating the gasket side frame body 721, the first mounting part 722, and the gasket side frame part 72 in an assembled shape. As shown in fig. 12, the rear end portion of the gasket side frame body 721 is inserted into the opening H10 provided in the first mounting part 722, and the right side surface portion 91 of the first mounting part 722 and the second side surface portion 44 of the gasket side frame body 721, and the left side surface portion 92 of the first mounting part 722 and the first side surface portion 43 of the gasket side frame body 721 are welded by laser welding.

Next, as a representative example, the effect of the left cushion side frame portion 72 including the left cushion side frame body 721 and the first attachment part 722 will be described, but the same effect will be obtained in the right cushion side frame portion 71 including the right cushion side frame body 711 and the first attachment part 712.

1) Since the cushion side frame body 721 and the first mounting part 722 are formed by the closed cross section that is strongest with respect to the torsional input, the weight of the cushion side frame portion 72 can be reduced.

2) Since the first mounting part 722 also functions as a riser, the number of parts of the gasket side frame portion 72 can be reduced.

3) Since the pad-side frame body 721 and the first mounting part 722 are fixed only by laser welding, a fastening part such as a bolt or a nut is not required. Therefore, the number of parts of the entire gasket side frame portion 72 can be reduced, and the weight can be reduced. Further, if there is a fastening point such as a bolt or a nut, stress concentration tends to occur around the fastening point, and there is a problem that breakage tends to occur early in a high strength test.

However, since the pad-side frame body 721, the first mounting component 722, and the left back-side frame 82 are assembled in a tower-like manner, the base point of deformation such as fastening of the connecting points can be eliminated. This reduces the possibility of early failure even in a high-strength test.

4) With respect to the rotational torque input in the front-rear direction from the backrest angle adjusting mechanism 9, the plate thickness of the left side surface portion 92 (outer surface side) of the first mounting part 722 is appropriately increased with respect to the center of the pad side frame main body 721, so that the first mounting part 722 can be prevented from being opened.

The present invention has been described above based on the embodiments, but the present invention is not limited to the embodiments and the embodiments, and various modifications can be made.

Description of the symbols

1: a vehicle seat; 2: a seat cushion; 3: a seat back; 5: a seat track; 51: a lower seat rail; 52: an upper seat rail; 6: a seat frame; 7: a seat cushion frame (cushion frame); 8: a seat back frame (back frame); 9: a backrest angle adjusting mechanism; 41: an upper face portion; 42: a lower face portion; 43: a first side surface portion; 44: a second side surface portion; 71. 72: a gasket side frame portion; 711. 721: a liner side frame body; 712. 722: a first mounting part; 713. 723: a vertical plate; 724: a reinforcing member (a gasket portion); 73: a front pipe frame; 74: a bracket; 75: a rear pipe frame; 81. 82: a back side frame; 83: a down tube frame; 84: an upper tube frame; 91: a right side face; 912: an inner face; 92: a left side face; 921: an outer face; 922: an inner face; 93: a lower face portion; 932: an inner face; 94: an upper face portion; r1: a region formed of a thick metal plate; r2: a region formed of a metal plate having a small plate thickness; r3: a region formed of a thick metal plate; r4: a region formed of a metal plate having a small plate thickness; r5: a region to which a thick metal plate and a thin metal plate are bonded; l1, L2, L3, L21, L22: a line representing a welded portion; h1, H2, H3, H10, H11, H12: an opening part; p1: a region that is closed-sectioned; p2, P4: and a notch part.

Claims

1. A vehicle seat in which, in a seat for a vehicle,

comprising a seat cushion and a seat back tiltably connected to the seat cushion via a back angle adjustment mechanism,

the aforementioned seat back includes a seat back frame,

the seat back frame includes a back side frame,

the seat cushion includes a seat cushion frame,

the seat cushion frame includes a cushion-side frame body; and a first mounting part for mounting the pad side frame body to the back side frame via the back angle adjusting mechanism,

the first mounting component has a first opening with a closed section,

the rear end of the pad side frame body is fitted into the first opening of the first mounting component and welded thereto.

2. The vehicle seat according to claim 1, wherein,

the first mounting component is configured by forming a sheet metal by press forming, joining both end portions of the sheet metal, and joining the sheet metal by welding to form a closed cross section.

3. The vehicle seat according to claim 1, wherein,

the first mounting part has

A right side face;

a left side surface portion facing the right side surface portion;

a lower surface portion provided between the right side surface portion and the left side surface portion; and

an upper surface portion facing the lower surface portion and provided between a lower end of the left surface portion and an upper end of the left surface portion,

the first opening is composed of the right side surface, the left side surface, the lower surface and the upper surface,

a second opening is provided in an upper end portion of the left side surface portion above the upper surface portion, and the backrest angle adjusting mechanism is fitted into the second opening.

4. The vehicle seat according to claim 3, wherein,

the lower end portions of the right side surface portion, the lower surface portion, the upper surface portion and the left side surface portion are formed of a thin metal plate,

the left side portion except the lower end portion of the left side portion is formed of a thick metal plate,

the upper end portion of the left side surface portion located above the upper surface portion is formed of the thin metal plate and the thick metal plate.

5. The vehicle seat according to claim 4, wherein,

the first mounting component is formed using a tailor welded material in which end surfaces of flat metal plates having different thicknesses are abutted against each other and welded.

6. The vehicle seat according to claim 4, wherein,

the left side face part has an inner face and an outer face,

the inner surface of the left side surface portion has a step having a thickness difference between the thin thickness and the thick thickness,

the outer surface of the left side surface portion is formed into a flat surface.

7. The vehicle seat according to claim 4, wherein,

the first mounting part has a rear end portion,

the rear end portion of the first mounting component is configured by cutting out a portion of the lower side of the left side surface portion, the lower side of the right side surface portion, and the lower surface portion.

8. The vehicle seat according to claim 1, wherein,

the pad side frame body is formed into a closed cross-sectional structure.