JPH11278128A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the safety and the rigidity in the transverse direction to prevent the oscillation to the right and left of an occupant by suppressing shifting up phenomenon of the occupant, bending and deforming a lower part of a seat back backward and effectively, and holding the occupant's waist part deeply in the seat back at the time of vehicle crash. SOLUTION: This seat for vehicle is constituted of right and left outer pipes 40, 40 divided into two parts in the transverse direction and fixed on a side frame 23 in an overhung manner and an inner pipe 50 inserted slidably in the right and left outer pipes 40, 40 in a cross member 30 provided in a lower part of a seat back frame 20. At collision, the right and left outer pipes 40, 40 are readily bent to the right, left, and backward, and the inner pipe 50 slides in the right and left outer pipes 40, 40. Consequently, it is possible to absorb impact effectively and hold the occupant's waist part deeply in a seat back 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat, and more particularly, to a seat cushion in which a seat back is tiltably mounted on a seat cushion and a shock absorbing function is provided below a seat back frame of the seat back. The present invention relates to a vehicle seat provided with a cross member.

[0002]

2. Description of the Related Art Normally, a vehicle seat installed in a vehicle is provided with a headrest for protecting the occupant's head and a seat back for protecting the occupant in the event of an accident or the like. Safety measures such as providing a support function to support the body are taken.

FIG. 9 shows a vehicle seat 1 having a lumbar support function for supporting an occupant's waist. The vehicle seat 1 supports the back side of the occupant with respect to a seat cushion 2 on which the occupant sits. The seat back 3 is attached to be tiltable. At the lower part of the seat back frame 4 of the seat back 3, a cross member 6 composed of a long plate is fixed between the side frames 5, 5, and the cross member 6 has a plurality of round holes 6a along the longitudinal direction.
Has been established. Then, when a vehicle accident such as a rear collision occurs, the waist of the occupant is strongly pressed against the seat back 3, and as shown in FIG.
Is deformed in the shape of a long hole, and the cross member 6 bends rearward, thereby reducing the impact applied to the occupant.

That is, when an external force indicated by an arrow F is applied as shown in FIG. 11 (a), the cross member 6 provided in a bridging manner between the side frames 5, 5 is bent rearward, and the bending deformation at this time is performed. Absorbs shock.

[0005]

However, in the conventional vehicle seat 1, a plate-shaped cross member 6 is provided in a bridging manner between the side frames 5 and 5 in the seat back frame 4, and the cross member 6 is bent. Although the configuration is such that the impact applied to the occupant is absorbed by the deformation, as shown in FIG. 11B, in order for the cross member 6 to bend sufficiently rearward, the side frames 5, 5 are respectively deformed in the direction of arrow a. I needed to.

Since the side frames 5 and 5 are rigid members, there is a limit in bending deformation. Therefore, the amount of bending of the cross member 6 to the rear side is small, and the occupant's body is deeply caught in the seat back 3. Can not be done, FIG.
As shown in the figure, the phenomenon that the occupant's body is shifted rearward has occurred. Conversely, if the side frame 5 is made of a material that is easily bent in order to secure the amount of bending of the cross member 6, the occupant can easily swing in the left-right direction.

[0007] The object of the present invention is to provide a rear-end collision or the like.
By minimizing the occupant's displacement phenomenon and keeping the occupant's body securely in the seat, it is possible to increase safety and maintain the rigidity of the side frame of the seat back,
An object of the present invention is to provide a vehicle seat with improved durability.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a vehicle seat according to a first aspect of the present invention has a shock absorbing function at a lower portion of a seat back frame of a seat back. In the vehicle seat provided with the cross member having, the cross member straddles a cantilever type outer pipe in which the outer terminal is divided into two parts left and right and an outer terminal is fixed to a side frame, and the left and right outer pipes,
The inner pipe is slidably inserted into the outer pipe, and when an impact is applied to the seat back, the outer pipe moves so as to expand to the left and right sides and bends backward, and the inner pipe is bent in the outer pipe. The sliding member is characterized in that the cross member bends and deforms backward by a predetermined stroke.

According to a second aspect of the present invention, in the vehicle seat, a tension spring is interposed between both ends of an inner pipe slidably inserted into the outer pipe and an outer end of the outer pipe. In a low-speed collision applied to the back, the outer pipe is forcibly returned to the original position by the spring force of the tension spring.

According to a third aspect of the present invention, the inner pipe inserted into the outer pipe is configured such that when an impact is applied to a seat back and the outer pipe expands and deforms to the left, right and rear sides, Is characterized by sliding operation with a predetermined sliding resistance with the outer pipe.

In the vehicle seat according to the fourth aspect, the rivet is caulked and fixed in the round hole of the inner pipe and the long hole of the outer pipe, and when the inner pipe slides in the outer pipe, the inner pipe slides. The sliding resistance of the rivet is added to the resistance.

In the vehicle seat according to the fifth aspect, a part of the outer pipe is narrowed inward, and when an impact is applied to the seat back, the inner pipe slides in the outer pipe. The resistance is enhanced by the constriction.

A vehicle seat according to a sixth aspect of the invention is characterized in that a ring-shaped packing for preventing rattling is provided on the inner end of the outer pipe divided into two parts on the left and right or on the outer peripheral surface of the inner pipe. And

According to the vehicle seat according to the first aspect of the present invention, the cross member installed at the lower portion of the seat back frame is divided into two parts in the lateral direction, and the outer end is fixed to the side frame. And an inner pipe slidably inserted into the outer pipe.The outer pipe is of a cantilever type having one end fixed to each side frame, so that an impact is applied to the seat back due to a rear collision or the like. When the inner end of the outer pipe is bent easily backward, the inner pipe inserted in the outer pipe slides in each outer pipe even if the inner ends of the outer pipe are separated to the left and right sides. Due to the operation, a large amount of rearward deformation stroke of the cross member can be secured.

Further, it is not necessary to reduce the rigidity of the side frame when the outer pipe is deformed, and it is possible to secure sufficient rigidity in the side frame to prevent the occupant from swinging left and right.

According to the vehicle seat according to the second aspect of the present invention, since the tension spring is provided between both ends of the inner pipe and the outer end of the outer pipe, it is relatively easy to prevent a low-speed rear collision or the like. When a weak impact is applied, the outer pipe expands to the rear and left and right, but the spring force of the tension spring urges the inner pipe in the outer pipe to the front, so the outer pipe is forced to its original position Is returned to.

According to the vehicle seat according to the third aspect of the present invention, the inner pipe is inserted into the outer pipe so that a predetermined sliding resistance acts between the outer pipe and the inner pipe. When an impact is applied to the seat back, the outer pipe is cantilevered, so it easily bends to the rear and the inner pipe slides in the outer pipe. Can be absorbed.

According to the vehicle seat of the fourth aspect of the present invention, since the rivet fixed to the inner pipe slides in the long hole of the outer pipe, an impact is applied to the seat back. In this case, since the sliding resistance of the rivet can be added to the sliding resistance caused by the sliding operation of the inner pipe, the impact applied to the occupant can be absorbed more effectively.

According to the vehicle seat according to the fifth aspect of the present invention, since the outer pipe is provided with the constricted portion inward, the frictional resistance between the inner pipe and the outer pipe is formed at the constricted portion. Therefore, an impact is applied to the seat back, and when the inner pipe slides in the outer pipe, the frictional resistance increases at the constricted portion, so that the impact applied to the occupant can be more effectively absorbed.

According to the vehicle seat of the sixth aspect of the present invention, the ring-shaped packing for preventing rattling is provided between the inner ends of the outer pipe or on the outer peripheral surface of the inner pipe corresponding thereto. Even if the inside terminals of the outer pipe collide with each other due to vibration during traveling or a relatively small collision, a collision noise or the like does not occur.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle seat according to the present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a perspective view showing a first embodiment of a vehicle seat according to the present invention, and FIGS. 2A, 2B, and 2C are views showing an operation of a cross member provided in the vehicle seat shown in FIG. FIGS. 3A and 3B show a modification of the cross member.
(A) is a perspective view of a cross member, (b) is a cross-sectional view showing a main part of the cross member, FIG. 4 is a perspective view showing a further modified embodiment of the cross member, and FIG. 5 is a vehicle seat according to the present invention. 7 is a partially cutaway perspective view of a cross member used in the second embodiment, FIG. 6 is a cross-sectional view of the cross member, and FIG.
(A), (b), and (c) are explanatory views showing the operation of the cross member, and FIG. 8 is a perspective view showing a modification of the cross member.

Referring to FIGS. 1 to 4, a first embodiment of the present invention will be described. In FIG. 1, a vehicle seat 10 according to the present invention includes a seat cushion 1 on which an occupant sits.
A seat back 12 is attached to the seat back 1 so as to be tiltable, and a headrest 13 that protects the occupant's head is installed on an upper edge of the seat back 12.

By the way, according to the present invention, when an impact is applied to the seat back 12 due to a rear collision accident or the like on the seat back frame 20 of the seat back 12, the occupant's displacement does not occur and the impact is effectively absorbed. It is intended to provide a vehicle seat 10 capable of enhancing safety and securely holding the occupant even when the occupant swings left and right by securely holding the occupant in the seat back 12.

That is, the seat back frame 20 of the seat back 12 has a holder 22 for holding a headrest stay (not shown) of the headrest 13 attached to an upper edge of a body frame 21 conforming to the outer shape of the seatback 12. Side frames 23, 23 are fixed to both sides of the frame 21 by welding or the like. A plurality of S-shaped springs 24 for providing cushioning are interposed between the side frames 23, 23, and a cross member having an excellent shock absorbing function is provided between the side frames 23 under the seat back frame 20. 30 are provided.

The cross member 30 is composed of left and right outer pipes 40, 40 and an inner pipe 50 slidably inserted into the left and right outer pipes 40, 40.

The left and right outer pipes 40, 40 have their respective outer terminals 41, 41 fixed to the inner surfaces of the respective side frames 23, 23 by welding or the like.
2, 42 are normally joined or opposed with a slight clearance.

The length of the inner pipe 50 provided inside the left and right outer pipes 40, 40 is not limited as long as the total length thereof is shorter than the total length of the left and right outer pipes 40, 40. The outer diameter of the inner pipe 50 may be slightly smaller than the inner diameter of the outer pipes 40 and 40, and may be any as long as it is slidable in the left and right outer pipes 40 and 40.

As described above, since the cross member 30 having the above-described structure is set below the seat back frame 20 of the seat back 12, the left and right outer pipes 40, 40 are normally provided as shown in FIG. Inside terminal 42,
42 are joined to each other, but when a relatively small impact such as a low-speed rear collision is applied, as shown in FIG.
The inner terminals 42, 42 of the left and right outer pipes 40, 40 are easily bent rearward because the 41 is a cantilevered structure fixed to the side frames 23, 23, and the inner terminals 42, 42 are mutually moved to the left and right sides. Separate from In response to the rearward bending operation of the left and right outer pipes 40, 40, the inner pipe 50 is moved by the left and right outer pipes 40, 40.
The slide operation is performed in 40.

Incidentally, in response to a relatively small impact shown in FIG. 2B, by pressing the rear portion of the seat back 12 forward, the left and right outer pipes 40, 40 return to their original positions. In addition, when a relatively large impact is applied, such as a high-speed rear collision, the left and right outer pipes 40, 40 are considerably deformed rearward as shown in FIG. 40 inside terminal 4
The inner pipe 50 slides inside the left and right outer pipes 40 so as to connect the inner pipes 2 and 42 to each other.

Therefore, the cross member 3 used in the present invention
According to 0, when an impact is applied to the seat back 12 such as a low-speed rear collision or a high-speed rear collision, the left and right outer pipes 4
Since the inner pipes 0 and 40 are easily deformed rearward and the inner pipes 50 slide within the left and right outer pipes 40, the left and right outer pipes 40 and 40 are flexed and deformed. The impact can be effectively absorbed by the sliding resistance when the inner pipe 50 slides inside.

Further, a large amount of stroke of the cross member 30 toward the rear side can be ensured, and the occupant can be caught deeply in the seat back 12, thereby minimizing a displacement phenomenon that has conventionally occurred. The occupant can be securely held by the seat back 12 and the headrest 13, and safety can be improved.

Furthermore, cantilevered left and right outer pipes 4
The side frame 23 is made of a material having high rigidity, so that the side frame 23 can be reliably held even when the occupant swings left and right. By increasing the lateral rigidity, the occupant can be more reliably protected.

Next, FIGS. 3 (a), 3 (b) and 4 show modifications of the above-described first embodiment.
(A) is a perspective view showing a modified embodiment of the cross member 30,
FIG. 3B is a sectional view of a main part. That is, FIG.
2B, a rivet 60 is caulked and fixed between the mounting round hole 51 of the inner pipe 50 and the elongated hole 43 provided in the left and right outer pipes 40 along the longitudinal direction.
As shown in (b) and (c), when an impact is applied to the seat back 12, when the inner pipe 50 slides in the left and right outer pipes 40, 40, the rivet 60 moves between the left and right outer pipes 40, 40. The structure which slides in the long hole 43 is adopted.

Therefore, in addition to the sliding resistance at the time of the sliding operation of the inner pipe 50, the sliding resistance when the rivet 60 slides in the long hole 43 is added, so that more impact can be absorbed. The impact applied to the occupant can be reduced significantly. Further, by adjusting the length and width of the long hole 43, the impact load can be effectively controlled.

Next, the one shown in FIG. 4 is provided with a constricted portion 44 in the left and right outer pipes 40, 40, and FIG.
As shown in (b) and (c), at the time of absorbing the shock, the inner pipe 50 is constricted by the constricted portion 44 so that the left and right outer pipes 4
The frictional resistance force between the outer pipes 0, 40 is increased, and a large impact can be absorbed by the constricted portions 44 provided on the left and right outer pipes 40, 40, similarly to the configuration in which the rivets 60 are installed. .

Further, FIGS. 5 to 7 (a), (b),
(C) shows a second embodiment of the present invention, in which an outer pipe 40, which is divided into two on the left and right sides and is cantilevered,
1 and the inner pipe 50 slidably inserted into the left and right outer pipes 40, 40, is the same as the cross member 30 shown in FIG. Pipes 40,40
A tension spring 70 is provided between the inner spring 50 and the inner pipe 50.

That is, a notch 45 is provided in the vicinity of the outer ends 41, 41 of the left and right outer pipes 40, 40. At both ends of the inner pipe 50, mounting holes 52 are formed. 71 is locked in the notch 45 of the left and right outer pipes 40, 40,
2 is locked in the mounting hole 52 of the inner pipe 50.

The operation of the cross member 30 will be described with reference to FIGS. 7A, 7B, and 7C. Before the collision, as shown in FIG. Although the inner terminal 42 of the outer pipe 40 is joined, when a low-speed rear collision occurs, that is, when a relatively small impact is applied, as shown in FIG. 7B, the inner terminals 42, 42 of the left and right outer pipes 40, 40 are separated from each other. However, the state shown in FIG. When the pipe 50 is biased forward by a spring, the pipe 50 is forcibly returned to the state shown in FIG.

Further, when a relatively large impact such as a high-speed rear collision is applied, as shown in FIG. 7C, the left and right outer pipes 40 are cantilevered, so that a large stroke amount And the inner pipe 5
0 slides inside the left and right outer pipes 40, 40, but the inner pipe 50 slides inside the left and right outer pipes 40, 40 with respect to the spring force of the tension spring 70. Can be used as part of the shock absorption, so more energy can be absorbed. Note that FIG.
In the state shown in (c), the cross member 30 does not return to the original state.

As shown in FIG. 8, the cross member 30 is connected to the inner terminals 4 of the left and right outer pipes 40, 40.
If a ring-shaped packing 80 made of rubber or the like is installed between the gears 2 and 42, vibrations during traveling and relatively small shocks are applied,
When returning to the original position, the left and right outer pipes 40, 40
Even if the inner terminals 42, 42 collide with each other, no rattling noise or the like is generated, and it is possible to contribute to quiet running.

The packing 80 is provided only on one side of the inner terminals 42, 42 of the left and right outer pipes 40, 40.
Alternatively, they may be provided on both sides.
0.

[0042]

The above is the embodiment of the vehicle seat according to the present invention. According to the vehicle seat according to the first aspect, the cross member installed at the lower portion of the seat back frame is provided in the lateral direction. The outer pipe is divided into two, and the outer end is fixed to the side frame, and the inner pipe is slidably inserted into the outer pipe. The outer pipe has one end fixed to each side frame. The inner end of the outer pipe flexes easily backward when an impact is applied to the seat back due to a rear collision, etc., so that the inner end of the outer pipe separates to the left and right, respectively. Since the inner pipe inserted inside the pipe slides in each outer pipe, a large deformation stroke can be secured to the rear side of the cross member. The occupant's waist can deeply held in the seat back, it is excellent in safety.

Further, it is not necessary to reduce the rigidity of the side frame when the outer pipe is deformed, and it is possible to secure sufficient rigidity in the side frame to maintain the occupant's left-right movement, and to obtain a stable seating state. is there.

According to the vehicle seat of the second aspect,
Since a tension spring is attached between both ends of the inner pipe and the outer end of the outer pipe, the outer pipe expands to the rear and left and right sides when a relatively weak impact such as a low-speed rear collision is applied. Since the inner pipe in the outer pipe is urged forward by the spring force of the extension spring, the outer pipe is forcibly returned to the original position, and can be reused.

According to the vehicle seat of the third aspect,
Because the inner pipe is inserted in the outer pipe so that a predetermined sliding resistance acts between the outer pipe and the inner pipe, when an impact is applied to the seat back,
Since the outer pipe is cantilevered, it easily bends backward and the inner pipe slides inside the outer pipe, but the sliding resistance at that time can effectively absorb the impact and add to the occupant The impact can be effectively mitigated.

According to the vehicle seat of the fourth aspect,
The rivet fixed to the inner pipe slides in the long hole of the outer pipe, so when an impact is applied to the seat back, the sliding resistance of the rivet is added to the sliding resistance caused by the sliding action of the inner pipe. Because it can absorb shock more effectively than the occupant,
The impact load can be controlled by changing the shape and size of the long hole.

According to the vehicle seat of the fifth aspect, since the constricted portion is provided in the outer pipe, the frictional resistance between the inner pipe and the outer pipe is increased by the constricted portion. Therefore, when an impact is applied to the seat back and the inner pipe slides in the outer pipe, the frictional resistance increases at the constricted portion, so that the impact applied to the occupant can be more effectively absorbed.

According to the vehicle seat of the sixth aspect, since the ring-shaped packing for preventing rattling is installed between the inner ends of the outer pipe or on the outer peripheral surface of the inner pipe corresponding thereto, the vehicle travels. Even if the inner terminals of the outer pipe collide with each other due to internal vibration or a relatively small collision, no collision sound or the like is generated, and there is no uncomfortable feeling at the time of sitting, which can contribute to quietness in the vehicle interior.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing a first embodiment of a vehicle seat according to the present invention.

FIGS. 2A and 2B show the operation of the cross member in the vehicle seat shown in FIG. 1, wherein FIG.
FIG. 3 is an explanatory diagram showing a state at the time of a low-speed rear-side collision, and FIG.

3 (a) is a perspective view of the cross member, and FIG. 3 (b) is a cross-sectional view of a main part of the cross member in the vehicle seat shown in FIG.

FIG. 4 is a perspective view showing a modification of the cross member in the vehicle seat shown in FIG. 1;

FIG. 5 is a perspective view showing a cross member used in a second embodiment of the vehicle seat according to the present invention.

FIG. 6 is a sectional view of the cross member shown in FIG. 5;

7A and 7B show the operation of the cross member shown in FIG. 5, wherein FIG. 7A shows a state before collision, FIG. 7B shows a state at low-speed rear collision, and FIG. 7C shows a state at high-speed rear collision. FIG.

FIG. 8 is a perspective view showing a modification of the cross member shown in FIG. 5;

FIG. 9 is a configuration explanatory view showing a conventional vehicle seat.

FIG. 10 is an explanatory view showing a deformed state of a cross member in a conventional vehicle seat.

11A and 11B are diagrams illustrating a cross member in a conventional vehicle seat, wherein FIG. 11A illustrates a state before a collision, and FIG. 11B illustrates a state at the time of a collision.

FIG. 12 is an explanatory view showing a shift-up phenomenon at the time of collision of a conventional vehicle seat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle seat 11 Seat cushion 12 Seat back 13 Headrest 20 Seat back frame 21 Body frame 23 Side frame 30 Cross member 40 Outer pipe 41 Outer terminal 42 Inner terminal 43 Long hole 44 Constricted portion 45 Notch 50 Inner pipe 51 Mounting round hole 52 mounting hole 60 rivet 70 tension spring 80 packing

Claims (6)

[Claims] 1. A vehicle seat in which a cross member having an impact absorbing function is disposed below a seat back frame of a seat back, wherein the cross member is divided into two parts, left and right, and an outer terminal is fixed to a side frame. It is composed of a holding outer pipe and an inner pipe that straddles the left and right outer pipes and is slidably inserted into the outer pipe, so that when an impact is applied to the seat back, the outer pipe expands to the left and right sides By moving and bending backward, the inner pipe slides inside the outer pipe,
A vehicle seat, wherein a cross member is bent and deformed rearward by a predetermined stroke. 2. A tension spring is interposed between both ends of an inner pipe slidably inserted into the outer pipe and an outer end of the outer pipe, and the tension spring is provided at the time of a low-speed collision applied to a seat back. The vehicle seat according to claim 1, wherein the outer pipe is forcibly returned to the original position by the spring force of the vehicle. 3. The inner pipe inserted into the outer pipe has a predetermined distance between the inner pipe and the outer pipe when an impact is applied to the seat back and the outer pipe expands and deforms left and right and rearward. The vehicle seat according to claim 1, wherein the vehicle seat performs a sliding operation without sliding resistance. 4. A rivet is caulked and fixed in the round hole of the inner pipe and the long hole of the outer pipe, and when the inner pipe slides in the outer pipe, the sliding resistance of the rivet is added to the sliding resistance of the inner pipe. The vehicle seat according to claim 3, wherein the vehicle seat is provided. 5. A part of the outer pipe is constricted inward, and when an impact is applied to the seat back, the sliding resistance of the inner pipe that slides in the outer pipe is strengthened by the constricted part. The vehicle seat according to claim 3, wherein: 6. A ring-shaped packing for preventing rattling noise is provided on the inner end of the outer pipe divided into two parts on the left and right or on the outer peripheral surface of the inner pipe. A vehicle seat according to claim 1.