JP5388273B2 - Back seat frame structure of vehicle seat and vehicle seat having the structure - Google Patents

Description

The present invention relates to a back seat frame structure of a vehicle seat and a vehicle seat having the structure, and more particularly, a back seat frame of a vehicle seat capable of suppressing deformation of the upper portion of the back seat toward the rear of the vehicle. The present invention relates to a structure and a vehicle seat having the structure.

Conventionally, a seat back frame structure of a vehicle seat capable of reducing an impact load acting on an occupant has been adopted. For example, Patent Document 1 discloses an example thereof.
The seat back frame structure of the vehicle seat includes a seat back frame integrally formed in a substantially U-shape, a pipe body that connects the left and right vertical frames of the seat back frame to each other, and the pipe body. And a flat tube portion flattened so that it can be bent and deformed by an impact load caused by a passenger collision.

According to the seat back frame structure of such a configuration, by connecting the left and right vertical frames with each other in the vehicle width direction with a tubular body, a closed cross-section structure (box structure) is formed, and when the flat tube portion collides, By functioning as an energy absorbing portion that substantially suppresses bending fracture of the vertical frame, it becomes possible to ensure the safety of the occupant during a collision.
However, such a conventional seat back frame structure has the following technical problems.

That is, by making the seat back frame structure a closed cross-section structure (box structure) and providing an energy absorbing portion, the strength or rigidity of the seat back frame structure is further improved, and therefore the vehicle is used when an impact load is applied. Although it has become possible to maintain the structural soundness of the seat, on the other hand, deformation occurs such that the upper portion of the back seat on which the headrest is installed falls to the vehicle rear side due to an impact load on the vehicle rear side.

Also, during normal vehicle operation, sudden depression of the accelerator or brake, or traveling on uneven road surfaces, the back seat upper part slightly deforms or vibrates, which increases the ride comfort of the driver. May cause adverse effects.
In order to prevent such deformation of the upper part of the back seat, if the rigidity of the side frame of the back seat is increased, the weight of the back seat itself is increased, and the fuel consumption of the vehicle is adversely affected.

JP-A-11-32865

In view of the above technical problems, the object of the present invention is to prevent the minute amount of the upper portion of the back seat that supports the occupant's head during normal operation of the vehicle without increasing the weight of the back seat of the vehicle seat. By preventing deformation, the ride comfort is ensured, and in the event of a vehicle collision, especially when an impact load is applied to the rear side of the vehicle, large back deformation of the back seat is prevented to ensure passenger safety. An object of the present invention is to provide a back seat frame structure for a vehicle seat that can be used.

In order to achieve the above object, a back seat frame structure of a vehicle seat according to the present invention is a back seat frame structure of a vehicle seat,
A back seat frame structure in which a lower end portion is connected to a rear end portion of the cushion seat frame structure so as to be tiltable with respect to the cushion seat frame structure;
The back seat frame structure has a pair of side frames extending in the vertical direction,
The pair of side frames includes a pair of side frames fixed to the back seat frame structure, with upper ends on the side portions of the pair of side frames and lower ends on the front side of the vehicle from the center of rotation of the back seat frame structure. On both sides of the
The cable is provided with a tension adjusting means for adjusting an initial tensile force generated in the cable.

According to the back seat frame structure of the vehicle seat having such a configuration, the slanted wire that is inclined in the downward direction toward the front of the vehicle is backed on each side portion of the pair of side frames extending in the vertical direction. By adjusting the initial tensile force generated in the cable tension provided on each side by the tensile force adjusting means provided in the seat frame structure, the frame structure of the back seat where the headrest is installed during normal operation Since the initial tensile force is always applied to the upper part of the vehicle in the forward direction, the upper part of the frame structure of the back seat is slightly deformed in the rear direction of the vehicle, thereby preventing the ride comfort of the passenger from being impaired. It becomes possible. On the other hand, in the case of an emergency such as a collision, for example, in the case of a rear collision, an impact load is applied to the back seat toward the rear of the vehicle. When the tension force of the tension wire resists, it is possible to contribute to preventing a large deformation of the back seat frame structure.
As described above, without causing an increase in weight in order to achieve high rigidity or high strength of the pair of side frames, the back seat that supports the head of the occupant during normal operation of the vehicle. By preventing a slight deformation of the upper part, the ride comfort is ensured, and in the event of a vehicle collision, especially when an impact load is applied to the rear side of the vehicle, the occupant is prevented by a large deformation of the back seat. It is possible to ensure safety.

In addition, when the load on the rear side of the vehicle is applied to the back seat frame structure, the cable staying wire reduces the moment acting on the back seat frame structure based on the load. The seat frame structure should have a property of acting against a tensile force while not resisting an external compressive force.
Furthermore, it is preferable that pulleys are provided on at least one side of the pair of side frames and the back seat frame structure, respectively, and that the cable is endless and is stretched between both pulleys.
Furthermore, it is preferable that the tensile force adjusting means comprises a bolt-nut mechanism and adjusts the initial tensile force by adjusting the screwing amount of the bolt into the nut.
In addition, a vehicle recliner is provided between the cushion seat frame structure and the back seat frame structure, and the back seat can be tilted with respect to the cushion seat.
A base member fixed to the cushion seat frame structure;
A pivot arm rotatably supported by the base member and fixed to the back seat frame structure;
A sliding engagement member interposed between the base member and the rotating arm, guided by a recess side wall formed in the base member so as to be movable forward and backward, and having external teeth formed at the tip;
A rotatable cam that moves the sliding locking member between a locking position that meshes with the internal teeth formed on the rotating arm and a locking release position that is spaced from the internal teeth;
An operating lever for rotating the cam;
The pivot arm is formed of an annular ring having a predetermined plate thickness and having a circular opening inside.
The inner teeth are provided along the inner peripheral surface of the annular ring, and a plurality of mounting bracket portions for fixing to the back seat frame structure are provided on the outer peripheral surface of the annular ring,
Furthermore, a mounting bracket part for fixing the lower end of the cable stay wire is attached to the outer peripheral surface of the annular ring,
Furthermore, it has a cover plate that closes the circular opening from the side opposite to the base member,
The plate thickness of the lid plate is preferably thinner than the plate thickness of the annular ring.
Further, the back frame structure has an upper frame that connects upper ends of the pair of side frames,
It is preferable that an upper end of the cable staying wire is provided at an overlapping connection portion between the pair of side frames and the upper frame.

Still further, it is preferable that the cable is provided on each side of the pair of side frames.
In addition, the cable staying wire may be made of a metal wire.
Further, the cable stayed wire is preferably made of a CFRP wire.
Furthermore, the oblique line is such that a line connecting the lower end of the cable-stretched wire and the rotation center of the backsheet is orthogonal to a line connecting the upper end of the cable-cable wire and the rotation center of the backsheet. A tension wire should be provided.
Moreover, the said cable-stretched wire consists of a single wire, and it is good for each end to be provided with the ring for fixation.
In addition, the pair of side frames has a U-shaped cross-section inwardly extending from the front and rear direction of the vehicle constituting the outer shape, and a protruding flange portion rising inward from the front and rear edges of the main side surface part. It is good to form in the shape and the width | variety of this main side part is substantially constant in a height direction.

In order to achieve the above object, a vehicle seat according to the present invention includes:
A pad provided so as to cover the entire frame structure of the vehicle seat according to any one of claims 1 to 11, and a bag provided so as to cover the frame structure of the vehicle seat and the entire pad. It has the structure which has the shape-like skin.

According to the vehicular seat having such a configuration, when the pad is applied to the back seat frame structure of the vehicular seat having such a configuration to complete the vehicular seat, the slanted wire itself is placed in the pad. By burying, it is possible to prevent the appearance of the vehicle seat from being damaged.

According to the back seat frame structure of the vehicle seat according to the present invention, the slanted wire that is inclined in the downward direction toward the front of the vehicle is provided on the side portion of each of the pair of side frames extending in the vertical direction. The vehicle is always attached to the upper part of the frame structure of the back seat during normal operation by adjusting the initial tensile force generated on the cable tension wire provided on each side by the tension adjusting means provided on the frame structure. Since the initial tensile force is applied in the forward direction, it is possible to prevent the upper part of the frame structure of the back seat from being slightly deformed in the rear direction of the vehicle, thereby impairing the ride comfort of the occupant. On the other hand, in the case of an emergency such as a collision, for example, in the case of a rear collision, an impact load is applied to the back seat toward the rear of the vehicle. When the tension force of the tension wire resists, it is possible to contribute to preventing a large deformation of the back seat frame structure.

According to the vehicle seat of the present invention, when the vehicle seat is completed by applying the pad to the frame structure of the vehicle seat having such a configuration, the cable-stayed wire itself is embedded in the pad. Thus, the appearance of the vehicle seat is prevented from being damaged.

Embodiments of a vehicle seat according to the present invention will be described below in detail with reference to the drawings, taking as an example the case of being applied to a front seat of an automobile.

FIG. 1 is a perspective view of a vehicle seat according to the first embodiment of the present invention. FIG. 2 is a side view of the vehicle seat according to the first embodiment of the present invention. 3 is a cross-sectional view taken along line AA of FIG. FIG. 4 is a detailed view of part A in FIG. FIG. 5 is a cross-sectional view taken along line BB in FIG. FIG. 6 is a schematic perspective view of the vehicle recliner according to the first embodiment of the present invention. FIG. 7 is a side view of the vehicle recliner according to the first embodiment of the present invention. 8 is a cross-sectional view taken along line AA in FIG. FIG. 9 is a schematic exploded perspective view of the vehicle recliner according to the first embodiment of the present invention. FIG. 10 is a schematic perspective view of the sliding locking member of the vehicle recliner according to the first embodiment of the present invention. FIG. 11 is a schematic view showing a locked state by the vehicle recliner according to the first embodiment of the present invention. FIG. 12 is a schematic view showing an unlocked state by the vehicle recliner according to the first embodiment of the present invention. FIG. 13 is a moment diagram generated in the back seat frame structure when an impact load directed toward the front of the vehicle is applied in the vehicle seat according to the first embodiment of the present invention. FIG. 14 is a moment diagram generated in the back seat frame structure when an impact load directed toward the rear of the vehicle is applied in the vehicle seat according to the first embodiment of the present invention.

As shown in FIGS. 1 and 2, a vehicle seat 100 according to the present invention is fixed to a passenger compartment floor, and includes a cushion seat frame structure portion 104 having cable stays 102A and B, which will be described later, and a lower end portion 106. A back seat frame structure portion 112, which is connected to the rear end portion 108 of the cushion seat frame structure portion 104 so as to be tiltable and has cable wires 110A and B, which will be described later, a back seat frame structure portion 112, and a cushion seat frame structure A vehicle seat frame structure having a recliner structure part 114 interposed between the parts 104, a pad (not shown) provided to cover the entire vehicle seat frame structure, and the frame structure of the vehicle seat And a bag-like skin (not shown) provided so as to cover the entire pad. FIG. 1 shows the rotation axis XX. 1 and 2, the front of the vehicle is the right side in the figure.

The back seat frame structure portion 112 will be described. The back seat frame structure portion 112 has an inverted U-shape as a whole and includes a pair of side frames 118A and 118B extending in the vertical direction and a pair of side frames 118A and 118B. It has an upper frame 120 that spans the upper ends of each.

As shown in FIG. 3, each of the pair of side frames 118 </ b> A and 118 </ b> B has a main side part 122 having a width in the front-rear direction of the vehicle constituting the outer shape, and an overhang rising inward from the front and rear edges of the main side part 122. The flange parts 123A and 123B are formed in a U-shape with an inward cross section.
A flat mat 124 is stretched in an opening formed inside the inverted U-shaped back seat frame structure portion 112, and an upper member 125 that connects upper portions of the pair of side frames 118A and 118B, and a pair of sides. A lower member 127 that connects the lower portions of the frames 118A and 118B is provided, and a headrest (not shown) attachment member 129 is attached to the upper frame 120. Similar to the pair of side frames 118A and 118B, both lower ends of the upper frame 120 are formed in a U-shaped cross section, and are fitted and connected to the upper portions of the pair of side frames 118A and 118B, respectively.

Explaining the oblique wires 110A, B, the oblique wires 110A, B are attached to the main side surface portions 122 of the pair of side frames 118A, B, respectively. Since any of the cable stays 102A and B has the same structure, one of them will be described below.
The upper end of the cable 110 is fixed to the back seat frame structure 112 at the sides of the pair of side frames 118, and the lower end is fixed to the back seat frame structure 112 at the front side of the vehicle from the center of rotation of the back seat frame structure 112. It is stretched. The oblique angle may be set as appropriate according to the assumed impact load or the like.
More specifically, the upper end of the cable 110 is provided at a fitting overlap portion 126 between the upper end of the pair of side frames 118 and the upper frame 120, while the lower end of the cable 110 is a recliner structure portion described later. 114 is provided on the bracket portion 58. As a result, the upper end of the cable staying wire 110 can be provided in a structurally reinforced part, while the lower end of the cable staying wire 110 is positioned using the bracket part of the recliner structure part 114. Is possible.

In particular, the line connecting the upper end of the cable staying wire 110 and the rotation center of the back seat frame structure portion 112 and the line connecting the lower end of the cable stay wire 110 and the rotation center of the back seat frame structure portion 112 should be as orthogonal as possible. In addition, it is preferable that the cable 110 is positioned.

Pulleys 128 </ b> A and B are provided on the side portions of the pair of side frames 118 and the bracket portion 58, respectively. The cable 110 is endless and is stretched between the pulleys 128 </ b> A and B.
For example, when the impact load is applied to the vehicle seat 100 at the time of collision, the type and material of the cable 110 can ensure structural soundness while bearing a part of the impact load. Although it is arbitrary as long as it has such strength or rigidity, it is preferably made of metal or CFRP, for example.

As shown in FIG. 4, the cable 110 is provided with a bolt-nut mechanism 130 corresponding to the initial tensile force adjusting means of the wire. More specifically, each end of the cable 110 is provided with a male threaded bolt 132A, B, while a nut 134A, B having a female threaded inward from each end. 136 is provided. By screwing each bolt 132 to the corresponding bore 134, the screwing amount is adjusted, so that the overall length of the wire is reduced in a state where the cable 110 is stretched over the pulleys 128A and 128B. The initial tensile force generated on the wire can be adjusted. According to such a configuration, in order to adjust the length of the wire, it is possible to adjust the length of the wire at two locations using the two bolts 132A and B.
As described above, the cable staying wire 110 is installed obliquely in such a direction that it goes down as it goes forward of the vehicle. Due to the initial tensile force generated in the wire, the cable staying wire 110 passes through the upper end of the cable staying wire 110 and A force toward the front of the vehicle is always applied to the upper part. From this, the screwing amount of the bolt 132 is determined in consideration of the force toward the front of the vehicle, so that the upper part of the back seat frame structure portion 112 is slightly deformed rearward of the vehicle during normal operation of the vehicle. Can be suppressed.

As a modification, a bolt 132 is provided at one end of the cable 110 and a nut 136 is provided at the other end, and the initial tensile force generated in the wire is adjusted by adjusting the screwing amount of the single bolt 132 into the nut 136. May be.

As described above, the configuration in which the endless wire is stretched between the pulleys 128 </ b> A and 128 </ b> B is substantially equivalent to the provision of the two oblique wires 110 on each side of the side frame 118. First, the bolt-nut mechanism 130 for adjusting the length of the wire can be unified.
It should be noted that such a length adjustment of the cable 110 needs to be performed before the urethane pad is applied to the entire back seat frame structure 112.
With such a cable 110, when a load toward the rear side of the vehicle, for example, an impact load in the event of a collision, is applied to the back seat frame structure 112, the back seat frame structure 112 is applied to the back seat frame structure 112 based on this load. Thus, while exerting a tensile force, it has a characteristic that does not resist a compressive force acting from the outside due to a load on the front side of the vehicle.

Next, referring to FIGS. 1 and 2 again, the cushion seat frame structure portion 104 will be described. The cushion seat frame structure portion 104 includes a pair of side frames 140A and 140B extending in the front-rear direction of the vehicle. The rear frame 141 that connects the rear end portions 108 of the pair of side frames 140A and 140B and the front frame 142 that connects the front ends of the pair of side frames 140A and 140B and are closed by these frames. A cross-sectional structure (box structure) is formed. A cushion spring 143 is provided between the rear frame 140 and the front frame 142 in the opening and closing direction of the vehicle.

As shown in FIG. 5, each of the pair of side frames 140A and 140B has a structure substantially similar to the side frame 118 of the back seat frame structure portion 112, and has a main width that is wide in the vertical direction of the vehicle that forms the outer shape. The side surface portion 144 and the overhanging flange portions 146A and 146B rising inward from the upper and lower edges of the main side surface portion 144 are formed in a U-shape inwardly in cross section.
Explaining the cable stays 102A and 102B, the cable stays 102A and 102B are attached to the side portions of the pair of side frames 140A and 140B, respectively. Since any of the cable stays 102A and B has the same structure, one of them will be described below.
The upper end of the slanted wire 102 is fixed to the cushion seat frame structure 104 at the side portion of the pair of side frames 140 and the lower end is fixed to the cushion seat frame structure 104 at the front side of the vehicle from the upper end, and is slanted. The oblique angle may be set as appropriate according to the assumed impact load or the like.
More specifically, the upper end of the cable 102 is provided on a bracket part 34 of a recliner structure 114 described later, while the lower end of the cable 102 is provided on a side part of the side frame 140.

In particular, a line connecting the upper end of the cable stay 102 and the rotation center of the back seat frame structure 112 and a line connecting the lower end of the cable stay 102 and the rotation center of the back seat frame structure 112 should be as orthogonal as possible. In addition, it is preferable to position the cable 102.
Pulleys 147A and B are provided on the side portions of the pair of side frames 140 and the bracket portion 34, respectively, and the cable 102 is endless and is stretched between the pulleys 147A and B.

For example, when the impact load is applied to the vehicle seat 100 in the event of a collision, the type and material of the cable stays 102A and 102B itself bears a part of the impact load while maintaining structural soundness. Although it is arbitrary as long as it has strength or rigidity that can be secured, it is preferably made of metal or CFRP, for example.
In addition, since the bolt-nut mechanisms 145A and 145B are provided in the cable stays 102A and B, respectively, since they are the same as the cable 110A and B provided in the back seat frame structure 112, the description thereof is omitted. However, in this case, the bolt-nut mechanisms 145A and 145B differ from the bolt-nut mechanism 130 in that they function not as an initial tensile force adjusting means but as a cable-stretching wire length adjusting means. That is, in a normal state in which no load is applied to the vehicle seat, a tensile force is not generated in the cable wires 102A and 102B, and the length of the wire may be adjusted so that the wire does not loosen, Or you may adjust the length of a wire so that it may be in the state which tension | tensile_strength generate | occur | produced in cable-stayed wire 102A, B. FIG.

Next, the recliner structure portion 114 will be described. As shown in FIG. 6, the recliner 10 includes a frame structure of a back seat on which a driver or an occupant rests and each side surface of a frame structure of a cushion seat on which a driver or an occupant sits. The pair of recliners 10 are connected by connecting shafts 12 extending in the width direction of the seat so that the back seat can be tilted with respect to the cushion seat. . Since the pair of recliners 10 has a similar structure, one of them will be described below.

As shown in FIGS. 7 to 9, the recliner 10 includes a pivot arm 14 attached to the back seat frame structure, a base member 16 attached to the cushion seat frame structure, and between the pivot arm 14 and the base member 16. A pivot 24 fixed to the operation lever 22 is schematically configured by a cam 18 and a pair of sliding locking members 20 disposed so as to sandwich the cam 18 and an operation lever 22 that rotates the cam 18. The pivot arm 14 is held so as to be pivotable with respect to the base member 16.

As shown in FIG. 9, the base member 16 is a steel circular plate material, and an insertion hole 26 through which the pivot 24 is inserted is formed at the center thereof, and the size of the insertion hole 26 increases with the rotation of the pivot 24. Thus, the base member 16 is not rotated. The base member 16 is provided with a pair of openings 28 </ b> A, B extending on both sides of the insertion hole 26. Each of the pair of openings 28 </ b> A and 28 </ b> B includes a pair of left and right guide side walls 30 and an arcuate side wall 32 connected to the upper and lower ends of the guide side walls 30. The size of each of the pair of openings 28 is such that a pair of sliding locking members 20 described later slide in the radial direction while being guided along the pair of left and right guide side walls 30 in the pair of openings 28. Is provided to be possible. The diameter of the arc-shaped side wall 32 is set to be the same as the diameter of the circular opening 52 of the rotating arm 14 described later.

On the opposite side of the base member 16 where the rotating arm 14 is located, a base bracket 34 is attached so as to close the pair of openings 28, and an insertion hole 33 through which the pivot 24 is inserted is formed at the center thereof. An attachment portion 36 that is fixed to the frame structure of the cushion seat C is provided below the base bracket 34. The attachment portion 36 is provided with a through hole 39 so that the bolt 37 is inserted into the through hole 39 and the corresponding through hole of the cushion sheet C, and the base bracket 34 and the cushion sheet C are fixed by the welding nut 41. (See FIG. 8). Further, as described above, a bracket for providing a pulley of the cable 102 is attached using the base bracket 34.

A plurality of projecting surfaces 11 are provided on one surface of the base member 16, and openings 13 complementary to the projecting surfaces 11 are provided at corresponding positions of the base bracket 34. The base bracket 34 is fixed to the base member 16 by, for example, welding. In the base member 16, a load transmission path is configured between the guide side wall 30 and the sliding locking member 20, so that the plate thickness of the base member 16 is set to have a strength that can withstand such a load. . For example, the plate thickness of the base member 16 is 3.6 mm. On the other hand, the plate thickness of the base bracket 34 is set to be thinner than the plate thickness of the base member 16.

The sliding locking member 20 will be described. A pair of the sliding locking members 20 are provided, and are guided by the pair of left and right guide side walls 30 in the corresponding openings of the pair of openings 28A and 28B of the base member 16, respectively. It is arranged to be able to advance and retreat in the radial direction.
As shown in FIG. 10, each sliding locking member 20 has outer teeth 38 formed on the outer peripheral side thereof, a cam surface 40 formed on the inner peripheral side thereof, and both side surfaces 47 and 49. Are parallel to each other and are in sliding contact with the guide side wall 39.
The cam surface 40 has a protruding engagement portion 42 that protrudes inward and an engagement recess 44 that is connected to the protruding engagement portion 42 and extends outward as in the conventional case. The engaging recess 44 is engaged with the cam 18 described later, whereby the external teeth 38 of each sliding locking member 20 are engaged with internal teeth 54 formed on the rotating arm 14 described later. Between the position and the unlocking position separated from the inner tooth 54, the position is moved so as to be movable forward and backward in the radial direction.
When the base member 16 and the rotating arm 14 are overlapped, the pair of sliding locking members 20 are in a space formed by the circular opening 52 of the rotating arm 14 and the pair of openings 28 of the base member 16. The external teeth 38 provided on each of the pair of sliding locking members 20 can be engaged with the internal teeth 54 provided on the circular opening 52 while being arranged and guided by the guide side walls 30 of the pair of openings 28. Yes.

The cam 18 will be described as shown in FIGS. 11 and 12. The cam 18 is interposed between the pair of sliding locking members 20, and the pivot 24 provided on the operation lever 22 is inserted in the center. A through hole 17 is provided. The size of the through hole 17 is such that the cam 18 is integrally rotated in the direction by the rotation of the pivot 24, so that the cam 18 is rotated by the rotation of the operation lever 22. is there. An opposing surface of each of the pair of sliding locking members 20 of the cam 18 is engaged with a protruding engaging portion 42 that protrudes inward, and is connected to the engaging portion 43 and outward. And an outer shape of the cam 18 is formed point-symmetrically with respect to its center position, and its plate thickness is set slightly thinner than the plate thickness of the rotating arm 14 described later. Unlike the sliding locking member 20, when arranged in the circular opening 52 of the rotating arm 14, it does not reach the pair of openings 28 of the base member 16. Thereby, it is possible to freely rotate within the circular opening 52.

The rotating arm 14 will be described. The rotating arm 14 is made of a steel annular ring, and a circular opening 52 is provided therein. The diameter of the circular opening 52 is the same as the diameter of the arc-shaped side wall 32 of the base member 16. Inner teeth 54 that mesh with the outer teeth 38 of the sliding engagement member 20 are provided on the upper and lower portions of the annular ring constituting the circular opening 52 over a predetermined range of the inner peripheral surface thereof. A load transmission path between the back seat B and the cushion seat C is formed by the engagement of the outer teeth 38 and the inner teeth 54 when the pair of sliding engaging members 20 are moved to the engaging positions. The plate thickness of the steel annular ring is set so that the external teeth 38 have a strength capable of withstanding such a load. The plate thickness of the steel annular ring is, for example, 3.6 mm. The steel annular ring may be formed by punching a circular plate material having a uniform thickness by fine blanking to provide the circular opening 52 to form the external teeth 38.
Four bracket portions 56 to be attached to the back seat B are provided on the outer peripheral portion of the rotating arm 14 at equal angular intervals (90 °) in the outer peripheral direction. Each bracket portion 56 is provided with a through hole 63 for inserting a hold pin 62 described later. The bracket portion 56 may be formed integrally with the annular ring.

On the opposite side of the pivot arm 14 where the base member 16 is located, a lid plate 58 is attached so as to block the circular opening 52, and a through-hole 60 through which the pivot 24 passes is provided at the center of the lid plate 58. It is done. Similar to the cam 18, the size of the through hole 60 is such that the lid plate 58 is integrally rotated in the direction by the rotation of the pivot 24, so that the lid plate 58 is rotated by the rotation of the operation lever 22. Is rotated. The lid plate 58 is a circular thin plate having the same diameter as the annular ring, and the bracket portion 67 is provided at the outer peripheral portion thereof at an equal angular interval (90 °) in the outer peripheral direction, like the rotating arm 14. One is provided. Each bracket portion 67 is provided with a through hole 65 through which a hold pin 62 described later is inserted. As a result, the hold pin 62 is inserted into the through-hole 63 of the rotating arm 14 and the corresponding through-hole 65 of the lid plate 58 and caulked, thereby fixing the lid plate 58 to the rotating arm 14 and rotating. A pair of sliding locking members 20 arranged in the circular opening 52 of the moving arm 14, the cam 18, and a spring 64 described later are held in the circular opening 52. Further, as shown in FIG. 8, the base member 16 is fixed by applying the shoulder portion of the hold pin 62 to the peripheral portion of the base member 16. Furthermore, as described above, a bracket for providing the pulley 128 of the cable 109 is attached to the outer periphery of the lid plate 58 using the lid plate 58.
Since the lid plate 58 only functions as a lid for the circular opening 52 and does not function as a strength member, the thickness of the rotating arm 14 is, for example, 3.6 mm, whereas the lid plate 58 has a lid thickness of 3.6 mm. The plate thickness of the play may be about 0.6 mm.

As shown in FIG. 9, the operation lever 22 is provided on the outer side of one recliner 10, a through hole is provided at one end, and the pivot 24 includes the through hole 33, the base member 16, and the cam 18. The operation lever 22 is fixed by being inserted through the through hole 60 of the lid plate 58. The operation lever 22 is urged to rotate in a certain direction by a pair of springs 64 disposed in the circular opening 52.

On the outside of one recliner 10, a spiral spring 70 is provided adjacent to and substantially parallel to the base bracket 34, one end is fixed to the backsheet B, and the other end is a holder bracket provided on the base bracket 34. By fixing to 72, the back seat | sheet B is urged | biased with respect to the cushion seat | sheet C so that it may rotate in a fixed direction.

The operation of the vehicle seat 100 having the above configuration will be described below with reference to FIGS. 11 to 14.

First, in each of the back seat B and the cushion seat C, by adjusting the bolt screwing amounts of the bolt-nut mechanism 130 and the bolt-nut mechanism 145 before providing the pads on the back seat frame structure portion 112 and the cushion seat frame structure portion 104, respectively. The initial tensile force generated in the cable 102 and the cable 110 is adjusted.
Next, when the back seat B is locked with respect to the cushion seat C, the operation lever 22 is urged by the spring 64. In this state, as shown in FIG. The sliding engagement member 20 engages with the protruding engagement portion 42 of the cam surface 40. As a result, each of the sliding locking members 20 moves outward while being guided along the guide side wall 30 of the base member 16, and the outer teeth 38 and the inner teeth 54 of the rotating arm 14 mesh with each other. The locked state in which the rotation of the fourteen base members 16 is restricted is maintained.
In such a locked state, when an excessive impact force is applied to the back seat B due to, for example, a collision accident, the impact force is transmitted from the back seat B to the rotating arm 14 via the mounting portion 36, and further, the rotating arm 14. The outer teeth 38 and the inner teeth 54 of the pair of sliding locking members 20 are engaged with each other, the cam surfaces 40 of the pair of sliding locking members 20 are engaged with the cams 18, and the pivot shaft 24 penetrating the cams 18. The load is transmitted to the cushion sheet C fixed to the base member 16. At this time, the plate thickness of the annular ring of the rotating arm 14, that is, the plate thickness of the external teeth 38 and the plate thickness of the base member 16 are set to values having such strength that can withstand such a load. The reclining function can be maintained regardless of the impact force.

In this case, the rotary arm 14 is provided with a circular opening 52 in the inside thereof, so that the weight can be reduced as compared with a conventional circular sector gear in which a circular plate material having a uniform thickness is pressed. It is possible. On the other hand, on the outer periphery of the annular ring, four bracket portions 56 provided with through holes 63 for attachment to the back seat B are provided at equiangular intervals (90 °) in the circumferential direction. Weight increases. However, in the conventional circular sector gear, six projecting surfaces are provided at equal angular intervals (60 °) in the circumferential direction in the vicinity of the pivot 24 for fixing to the backsheet B. As the distance becomes longer, the load to be borne can be reduced, so that the number of bracket portions 56 installed can be reduced. Thereby, also about the bracket part 56 to the back seat | sheet B, it is possible to achieve weight reduction compared with the past.

More specifically, during normal operation of the vehicle, the upper portion of the back seat frame structure portion 112 is always pulled forward of the vehicle due to the force component of the initial tensile force generated in the cable tension wires 110 </ b> A, B directed toward the vehicle front. As a result, it is possible to prevent a slight deformation of the upper portion of the back seat frame structure portion 112 toward the rear side of the vehicle and impair the riding comfort of the vehicle.
Further, as shown in FIG. 13, when an impact load F1 is applied to the back seat frame structure 112 toward the front of the vehicle due to a collision, for example, each of the pair of side frames 118A and 118B of the back seat frame structure portion 112 has Then, a bending moment M that increases as the rotation center is approached is generated. In this case, the cable wires 110A, 110B are positioned so that the lower end P2 is positioned on the vehicle front side from the upper end P1, and since it is in the shape of a wire, it is compressed to the cable wires 110A, B with the load of the impact load F1. There is no power. The structural soundness of the vehicle seat 100 can be maintained by setting the cross-sectional shape of each of the pair of side frames 118A and 118B so as to withstand such a bending moment M and securing the cross-sectional modulus. is there.

On the other hand, as shown in FIG. 14, for example, when an impact load F2 larger than an impact load F1 toward the front of the vehicle is applied to the back seat frame structure 112 due to a collision, the back seat frame structure 112 Each of the pair of side frames 118A and 118B has a bending moment that increases as the center of rotation is approached. At this time, a tensile force T is generated in the cable 110A, B attached to each of the pair of side frames 118A, 118B, and the bending moment accompanying the impact load F2 is reduced with respect to the back seat frame structure portion 112. Acts like FIG. 14 shows a bending moment M2 that occurs when the cable stays 110A, B are not installed, and a bending moment M1 that occurs when the cable stays 110A, B are installed. As shown in FIG. 14, M <b> 1 is smaller than M <b> 2 in a range below the upper ends P <b> 1 of the cable wires 110 </ b> A and B toward the rotation center.
It should be noted that the same effect is exerted on the cable 102A, 102B provided in the cushion seat frame structure 104.
Thus, the difference between the impact load toward the front of the vehicle and the impact load toward the rear of the vehicle without setting the cross-sectional shape of the pair of side frames 118A and 118 for a greater impact load toward the rear of the vehicle. , The weight of the pair of side frames 118A, B can be reduced while securing the necessary strength or rigidity, and in particular, conventionally, before and after the vehicle. The wide main side surface extending in the direction is diverging toward the center of rotation in the height direction, and this degree of diverging can be reduced, and in some cases it is possible to almost eliminate the diverging taper. Become.

When releasing the locked state of the back seat B with respect to the cushion seat C and rotating the back seat B, the cam 18 is similarly rotated in the same direction by rotating the operation lever 22 against the coil spring 64. Therefore, as shown in FIG. 12, the engagement state between the engaging portion 43 of the cam 18 and the protruding engaging portion 42 of the sliding locking member 20 is released. In such a state, when the back seat B is tilted, the rotation arm 14 is thereby rotated, and the sliding engagement member 20 is applied by the force applied to the sliding engagement member 20 from the inner teeth 54. It slides inward, and the engaging recess 44 of the sliding locking member 20 and the protruding engaging portion 45 of the cam 18 are engaged. In this state, the meshing state between the inner teeth 54 and the outer teeth 38 is released. As a result, the locked state is released, and the back seat B can be tilted at a desired angle with respect to the cushion seat C. When the back seat B is tilted by a desired angle, the cam 18 is rotated in the reverse direction by releasing the rotation of the operation lever 22, whereby the sliding engagement member 20 is slid outward in the radial direction again. As a result, the meshing state of the inner teeth 54 and the outer teeth 38 is restored and the locked state is restored.

As described above, according to the frame structure of the vehicle seat 100 having the above-described configuration, the slopes of the side portions of the pair of side frames 118 </ b> A and 118 </ b> B extending in the vertical direction are inclined so as to descend in the forward direction of the vehicle. The tension wires 110A, B are provided in the back seat frame structure 112, and the normal operation is performed by adjusting the initial tensile force generated in the oblique wires 110A, B provided on the respective sides by the tension force adjusting means 130A, B. In this case, since the initial tensile force is always applied in the front direction of the vehicle to the upper part of the frame structure 112 of the back seat where the headrest is installed, the upper part of the frame structure 112 of the back seat is directed in the rear direction of the vehicle. By minutely deforming, it becomes possible to prevent the ride comfort of the occupant from being impaired. On the other hand, in the case of an emergency such as a collision, for example, in the case of a rear collision, an impact load is applied to the back seat toward the rear of the vehicle. By resisting the tensile force of the tension wires 110 </ b> A and B, it is possible to contribute to preventing a large deformation of the back seat frame structure 112.
As described above, the pair of side frames 118A and 118B themselves support the occupant's head during normal operation of the vehicle without causing an increase in weight in order to achieve high rigidity or high strength. Preventing minute deformation of the upper part of the back seat to ensure ride comfort and prevent large deformation of the back seat in the event of a vehicle collision, particularly when an impact load is applied to the rear side of the vehicle. Thus, it is possible to ensure the safety of the passenger.

At this time, when the vehicle seat 100 is completed by applying the pad to the frame structure of the vehicle seat 100 having such a configuration, the cable 110A, B itself is embedded in the pad so that the vehicle It is prevented that the appearance of the protective sheet 100 is impaired.

Below, 2nd Embodiment of this invention is described, referring drawings. FIG. 15 is a perspective view of a vehicle seat according to the second embodiment of the present invention. FIG. 16 is a side view of the vehicle seat according to the second embodiment of the present invention. FIG. 17 is a diagram of a cable stay according to a second embodiment of the present invention.

In the following description, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and the characteristic part of the present embodiment will be described in detail.
The feature of this embodiment is the structure of the cable stays 110A, B and 102A, B. More specifically, in the first embodiment, the pulleys 128A, B and the pulleys 147A, B are formed endlessly. Although the wire is stretched, in this embodiment, a single wire is employed. Since the cable wires 110 and 102 have the same characteristics, only one of them will be described.

More specifically, the cable-stayed wire 110 has an upper end fixed to a pin (not shown) provided on the pair of side frames 118 via a fixing ring 150A, and a lower end fixed to the fixing ring. Through 150B, the pin is fixed to a pin (not shown) provided on the bracket portion 65 of the recliner structure portion 114 through an opening of the ring, and one wire is obliquely formed on each side of the pair of side frames 118A and 118B. It is extended.
According to the cable 110A, B having such a configuration, for example, when an impact load similar to that of the first embodiment is assumed, in the first embodiment, the two cables 128A, B are connected between the pulleys 128A, B. In contrast to providing 110, in the present embodiment, since a single wire is provided, it is necessary to increase the thickness of the wire, but the first embodiment. Thus, it becomes possible to provide a wire without installing two pulleys 128A and 128B.

In addition, in order to adjust the length of the cable 110A, B, the bolt-nut mechanism 130 is provided in the middle of the wire, and the initial tensile force generated in the cable is adjusted by adjusting the screwing amount of the bolt 132 into the nut 136. The points to be adjusted are the same as in the first embodiment.

Although the embodiments of the present invention have been described in detail above, various modifications and variations can be made by those skilled in the art without departing from the scope of the present invention. For example, in the present embodiment, in the back seat frame structure, one end portion of the pair of side frames is provided with an endless slanted wire as in the first embodiment, while as in the second embodiment. A single cable stay may be provided on the other side.
Further, in the present embodiment, the description has been given for the automobile seat, but the present invention is not limited thereto, and can be applied to general vehicles such as a railway vehicle, a ship, and an airplane. Moreover, when using with respect to the seat of a motor vehicle, it is applicable to both a rear seat and a front seat.

The frame structure of a vehicle seat and the vehicle seat having the structure according to the present invention achieve a reduction in the overall weight while ensuring a necessary strength or rigidity against an impact load that acts in the event of a collision, for example. Therefore, it is useful in that it contributes to the reduction of the fuel required for the vehicle, and hence the reduction of carbon dioxide emissions.

1 is a perspective view of a vehicle seat according to a first embodiment of the present invention. 1 is a side view of a vehicle seat according to a first embodiment of the present invention. It is sectional drawing which follows the line AA of FIG. FIG. 2 is a detailed view of part A in FIG. 1. It is sectional drawing which follows the line BB of FIG. 1 is a schematic perspective view of a recliner for a vehicle seat according to a first embodiment of the present invention. It is a side view of the recliner of the vehicle seat which concerns on 1st Embodiment of this invention. It is sectional drawing which follows the line AA of FIG. 1 is a schematic exploded perspective view of a recliner for a vehicle seat according to a first embodiment of the present invention. It is a schematic perspective view of the sliding locking member of the recliner of the vehicle seat which concerns on 1st Embodiment of this invention. It is the schematic which shows the locked state by the recliner of the vehicle seat which concerns on 1st Embodiment of this invention. It is the schematic which shows the lock release state by the recliner of the vehicle seat which concerns on 1st Embodiment of this invention. In the vehicle seat which concerns on 1st Embodiment of this invention, it is a moment figure which arises in a back seat frame structure when the impact load which goes ahead of a vehicle is loaded. In the vehicle seat which concerns on 1st Embodiment of this invention, it is a moment figure which arises in a back seat frame structure when the impact load which goes to a vehicle rear is loaded. It is a perspective view of the vehicle seat which concerns on 2nd Embodiment of this invention. It is a side view of the vehicle seat which concerns on 2nd Embodiment of this invention. It is a figure of the cable-stayed wire which concerns on 2nd Embodiment of this invention.

Explanation of symbols

C Cushion Seat B Back Seat 10 Recliner 12 Connecting Shaft 14 Rotating Arm 16 Base Member 18 Rotating Cam 20 Sliding Locking Member 22 Operation Lever 24 Axle 26 Inserting Hole 28 Pair of Openings 30 Guide Side Wall 32 Arc-Shaped Side Wall 34 Base bracket 38 External tooth 40 Cam surface 42 Projection engagement portion 44 Engagement recess 52 Circular opening 54 Internal tooth 58 Lid plate 62 Hold pin 64 Spring 70 Spiral spring 100 Vehicle seat 102 Oblique wire 104 Cushion seat frame structure 106 Lower end 108 Rear end portion 110 Cable stay wire 112 Back seat frame structure 114 Recliner structure portion 116 Vehicle seat frame structure portion 118 Pair of side frames 120 Upper frame 122 Main side surface portion 124 Flat mat 126 If the overlapping portion 128 pulley 130 volts - nut unit 132 volts 134 bore 136 nut 140 pair of side frames 141 rear frame 142 front frame 144 cushion spring 146 main side portion 148 flange portion

Claims (13)

A back seat frame structure for a vehicle seat,
A back seat frame structure in which a lower end portion is connected to a rear end portion of the cushion seat frame structure so as to be tiltable with respect to the cushion seat frame structure;
The back seat frame structure has a pair of side frames extending in the vertical direction,
The pair of side frames includes a pair of side frames fixed to the back seat frame structure, with upper ends on the side portions of the pair of side frames and lower ends on the front side of the vehicle from the center of rotation of the back seat frame structure. On both sides of the
The cable is provided with a tensile force adjusting means for adjusting an initial tensile force generated during normal operation with respect to the cable .
The cable seat is provided only on the front side of the back seat frame structure so as to bear a difference between an impact load on the vehicle front side and an impact load on the vehicle rear side. Back seat frame structure. When the load on the rear side of the vehicle is applied to the back seat frame structure, the cable staying wire reduces the moment acting on the back seat frame structure based on the load. 2. The back seat frame structure for a vehicle seat according to claim 1, wherein the structure has a characteristic of acting against a tensile force on the structure but not resisting an external compression force. 2. The pulley according to claim 1, wherein pulleys are respectively provided on at least one side portion of the pair of side frames and the back seat frame structure, and the cable is endless and is stretched between both pulleys. Back seat frame structure for vehicle seats. 2. The back seat frame structure for a vehicle seat according to claim 1, wherein the initial tensile force adjusting means includes a bolt-nut mechanism, and adjusts an initial tensile force by adjusting a screwing amount of the bolt into the nut. A vehicle recliner is provided between the cushion seat frame structure and the back seat frame structure, and the back seat is tiltable with respect to the cushion seat.
A base member fixed to the cushion seat;
A pivot arm rotatably supported by the base member and fixed to the back seat;
A sliding engagement member interposed between the base member and the rotating arm, guided by a recess side wall formed in the base member so as to be movable forward and backward, and having external teeth formed at the tip;
A rotatable cam that moves the sliding locking member between a locking position that meshes with the internal teeth formed on the rotating arm and a locking release position that is spaced from the internal teeth;
An operating lever for rotating the cam;
The pivot arm is formed of an annular ring having a predetermined plate thickness and having a circular opening inside.
The inner teeth are provided along the inner peripheral surface of the annular ring, and the outer peripheral surface of the annular ring is provided with a plurality of mounting bracket portions that are fixed to the back seat.
The lower end of the cable is fixed to one of the plurality of mounting bracket portions,
Furthermore, it has a cover plate that closes the circular opening from the side opposite to the base member,
The plate thickness of the lid plate is thinner than the plate thickness of the annular ring,
The back seat frame structure of the vehicle seat according to claim 1. The back frame structure has an upper frame that connects upper ends of the pair of side frames,
2. The back seat frame structure for a vehicle seat according to claim 1, wherein an upper end of the cable is provided at an overlapping connection portion between the pair of side frames and the upper frame. The back seat frame structure of the vehicle seat according to claim 1, wherein the cable is provided on each side portion of the pair of side frames. The back seat frame structure for a vehicle seat according to claim 1, wherein the cable is composed of a metal wire. The back seat frame structure for a vehicle seat according to claim 1, wherein the cable is made of CFRP. The cable is connected so that a line connecting the lower end of the cable and the rotation center of the backsheet is orthogonal to a line connecting the upper end of the cable and the rotation center of the backsheet. The back seat frame structure of the vehicle seat according to claim 1 provided. The back seat frame structure for a vehicle seat according to claim 1, wherein the cable is composed of a single wire, and a fixing ring is provided at each end. The pair of side frames have a U-shaped cross section in which a main side surface having a width in the front-rear direction of the vehicle constituting the outer shape and an overhanging flange portion rising inward from the front and rear edges of the main side surface portion are inward. The back seat frame structure for a vehicle seat according to claim 1, wherein the width of the main side surface portion is substantially constant in the height direction. A pad provided so as to cover the entire back seat frame structure of the vehicle seat according to any one of claims 1 to 12, and a back seat frame structure of the vehicle seat and the pad as a whole. A vehicular seat comprising a bag-shaped skin provided.

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