Vehicle seat

Abstract

To inhibit submarine phenomenon in a vehicle seat.SOLUTION: A vehicle seat 10 includes: a seat frame 32; a submarine restriction member 52; a load receiving member 54 disposed at the rear relative to the submarine restriction member 52; and a connection member 56 connecting the submarine restriction member 52 and the load receiving member 54 with each other. The connection member 56 is rotatably supported through a rotation shaft part 58 located between the submarine restriction member 52 and the load receiving member 54 in a front-back direction by the seat frame 32. The submarine restriction member 52 is moved upward in conjunction with downward movement of the load receiving member 54.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to vehicle seats. [Background technology]

[0002] During a frontal collision of a vehicle, a phenomenon in which an occupant breaks free from the restraints of a seat belt, slides off the seat, and slides under the dashboard, etc., is known as the submarine phenomenon. The submarine phenomenon is more likely to occur when the rearward reclining angle is large. In JP 2020-32764 A, a submarine prevention member is disposed on the seat cushion frame to prevent the submarine phenomenon. The submarine prevention member is connected to the belt and buckle of the seat belt device via a wire-shaped load transmission member. During a frontal collision of the vehicle, the submarine prevention member is moved upward by the load transmission member. As a result, the submarine prevention member can prevent the occupant from moving forward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2020-32764 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-described conventional technology, there is a possibility that the load is not properly transmitted to the load transmitting member during a collision, and the submarine prevention member does not move upward sufficiently.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] An aspect of the present disclosure is a vehicle seat comprising a seat frame, a submarine prevention member displaceable relative to the seat frame, a load-receiving member displaceable relative to the seat frame and positioned rearward of the submarine prevention member, and a connecting member that connects the submarine prevention member and the load-receiving member to each other, wherein the connecting member is rotatably supported on the seat frame via a pivot shaft portion positioned between the submarine prevention member and the load-receiving member in the fore-and-aft direction, and the submarine prevention member moves upward as the load-receiving member moves downward. [Effects of the Invention]

[0007] According to the vehicle seat of the present disclosure, in the event of a collision, the load-receiving member is pushed downward by the load from the occupant and descends, causing the anti-submarining member to rise. This allows the anti-submarining member to be closer to the occupant, thereby preventing the submarining phenomenon. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a frame of a vehicle seat and its surrounding structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the cushion frame and the submarine restraint mechanism. [Figure 3] Fig. 3A is a cross-sectional view taken along line IIIA-IIIA in Fig. 2, showing a state before the submarine suppression mechanism is activated, and Fig. 3B is a cross-sectional view showing a state after the submarine suppression mechanism is activated. [Figure 4] FIG. 4 is a plan view of the cushion frame and the submarine prevention mechanism according to the modified example. [Figure 5] Fig. 5A is a cross-sectional view taken along line VA-VA in Fig. 4, showing a state before the submarine prevention mechanism according to the modified example is activated, and Fig. 5B is a cross-sectional view showing a state after the submarine prevention mechanism according to the modified example is activated. DETAILED DESCRIPTION OF THE INVENTION

[0009] The vehicle seat 10 according to this embodiment shown in FIG. 1 is installed on a floor panel 12 of an automobile. The vehicle seat 10 may be, for example, a driver's seat, a passenger seat, or a seat in the second or subsequent rows. The vehicle seat 10 may also be a seat installed in an autonomous vehicle that does not require a driver. The vehicle seat 10 may also be a seat installed in other vehicles such as trains and airplanes. In the following description, a case in which the vehicle seat 10 is installed in an automobile will be described. In addition, in the following description, the seat width direction (direction of arrow W) is the direction perpendicular to the vehicle's fore-and-aft direction and the vertical direction (the vehicle's left-right direction). The seat width direction is the same direction as the vehicle width direction.

[0010] The vehicle seat 10 includes a seat cushion 14, a seat back 16, and a headrest 18. The seat cushion 14 is the portion on which the occupant sits. The seat back 16 is the portion against which the occupant rests. The seat back 16 is tiltable relative to the seat cushion 14. The lower end of the seat back 16 is rotatably connected to the rear end of the seat cushion 14. The vehicle seat 10 includes a reclining mechanism (not shown). The reclining mechanism allows the inclination angle (reclining angle) of the seat back 16 relative to the vertical direction to be adjusted. The headrest 18 is connected to the upper end of the seat back 16. The headrest 18 supports the head of the occupant.

[0011] A seat belt device 20 is disposed in the vehicle. The seat belt device 20 is a mechanism for restraining an occupant in a vehicle seat 10. This seat belt device 20 is a three-point seat. Therefore, the seat belt device 20 includes a belt 22, a tongue plate 24, and a buckle 26. The belt 22 is a belt-shaped member for restraining an occupant seated in the vehicle seat 10.

[0012] One end of the belt 22 is fixed to one end of the seat cushion 14 in the seat width direction. The other end of the belt 22 is engaged with a retractor 28. The retractor 28 is a mechanism for retracting the belt 22, and is disposed, for example, at the bottom of a center pillar. An intermediate portion of the belt 22 is inserted between a tongue plate 24 and a belt guide 30. The tongue plate 24 is detachable from a buckle 26. The belt guide 30 is disposed, for example, at the top of a center pillar of the vehicle body. The buckle 26 is disposed at the other end of the seat cushion 14 in the seat width direction.

[0013] Next, the configuration of the seat cushion 14 will be described in detail.

[0014] The seat cushion 14 has a cushion frame 34. The seat back 16 has a seat back frame (not shown). The cushion frame 34 and the seat back frame form the seat frame 32 of the vehicle seat 10. In other words, the cushion frame 34 is a part of the seat frame 32.

[0015] The cushion frame 34 has a pair of cushion side frames 36, a front frame 38, and a rear frame 40. Hereinafter, the cushion side frames 36 will be simply referred to as "side frames 36." The pair of side frames 36 are arranged spaced apart in the seat width direction. The pair of side frames 36 are located at both ends of the cushion frame 34 in the seat width direction and extend in the front-to-rear direction of the vehicle. A pair of upper rails 42 are fixed to the lower ends of the pair of side frames 36, respectively. The pair of upper rails 42 are slidably supported by a pair of lower rails 44 fixed to the floor panel 12 of the vehicle body.

[0016] The front frame 38 connects the front ends of the pair of side frames 36. The front frame 38 extends in the seat width direction. One end of the front frame 38 in the seat width direction is fixed to one of the side frames 36. The other end of the front frame 38 in the seat width direction is fixed to the other side frame 36.

[0017] The rear frame 40 connects the rear ends of the pair of side frames 36. The rear frame 40 extends in the seat width direction. One end of the rear frame 40 in the seat width direction is fixed to one of the side frames 36. The other end of the rear frame 40 in the seat width direction is fixed to the other side frame 36.

[0018] Although not shown in detail, the seat cushion 14 further includes a seat cushion pad and a seat covering. The seat cushion pad is supported by a cushion frame 34. The seat cushion pad is covered with the seat covering.

[0019] The vehicle seat 10 further includes a submarine suppression mechanism 50. The submarine suppression mechanism 50 is a mechanism for suppressing the submarining phenomenon of an occupant seated in the vehicle seat 10 in the event of a frontal collision of the vehicle. The submarine suppression mechanism 50 is built into the seat cushion 14. Specifically, the submarine suppression mechanism 50 is located below a seat cushion pad (not shown) (between the seat cushion pad and the floor panel 12). The submarine suppression mechanism 50 includes a submarine restricting member 52, a load receiving member 54, a connecting member 56, and a pivot shaft portion 58.

[0020] The submarine prevention member 52 is displaceable in the up and down direction relative to the seat frame 32 (the pair of side frames 36). As shown in FIG. 2, the submarine prevention member 52 extends in the seat width direction (the direction of arrow W). The submarine prevention member 52 is disposed between the pair of side frames 36. The length of the submarine prevention member 52 in the seat width direction is shorter than the distance between the pair of side frames 36 in the seat width direction. Therefore, both ends of the submarine prevention member 52 are not in contact with the pair of side frames 36.

[0021] The load-receiving member 54 is displaceable in the up-down direction relative to the seat frame 32. The load-receiving member 54 is disposed rearward of the submarine-restricting member 52. The load-receiving member 54 extends in the seat width direction. Both ends of the load-receiving member 54 are inserted into a pair of guide holes 60 formed in each of the pair of side frames 36.

[0022] 3A , each guide hole 60 is a generally arc-shaped hole extending along an arc centered on the rotation axis Ax of the rotation shaft portion 58. Each guide hole 60 is an elongated hole extending in the vertical direction behind the rotation shaft portion 58. When the load-receiving member 54 is located in the pre-movement position, which is the initial position, the load-receiving member 54 is inserted into the upper part of the guide hole 60.

[0023] A movement restricting portion 62 is provided on the edge 61 of the guide hole 60. The movement restricting portion 62 is a protrusion 63 that protrudes from the edge 61 toward the inside of the guide hole 60. In this embodiment, the movement restricting portion 62 is provided on the front edge 61a of the guide hole 60. The movement restricting portion 62 may also be provided on the rear edge 61b of the guide hole 60. The hole width of the guide hole 60 at the portion where the movement restricting portion 62 is provided is smaller than the outer diameter of the load receiving member 54. Therefore, the movement restricting portion 62 restricts downward movement of the load receiving member 54 when it is in the pre-movement position.

[0024] On the other hand, the movement restricting portion 62 allows the load receiving member 54 to move downward when a load equal to or greater than a predetermined value acts on the load receiving member 54. As shown in FIG. 3B , when the load receiving member 54 is located in the post-movement position, the load receiving member 54 is inserted into the lower part of the guide hole 60. Note that the form of the movement restricting portion 62 is not limited to the protrusion 63. The movement restricting portion 62 may be, for example, an elastic member (such as a spring) that urges the load receiving member 54 upward.

[0025] As shown by the imaginary lines in Fig. 3A, a biasing member 64 (such as a coil spring or a torsion spring) may be disposed as a mechanism for restricting downward movement of the load receiving member 54 in the pre-movement position. The biasing member 64 biases the connecting member 56 in a direction that raises the load receiving member 54. When such a biasing member 64 is provided, the movement restricting portion 62 does not need to be provided.

[0026] The connecting member 56 connects the submarine prevention member 52 and the load receiving member 54 to each other. The connecting member 56 is not limited to a shape extending linearly between the submarine prevention member 52 and the load receiving member 54, but may also have a shape that is bent at an intermediate portion in the longitudinal direction. The connecting member 56 is rotatably supported on the seat frame 32 via a pivot shaft portion 58 that is located between the submarine prevention member 52 and the load receiving member 54 in the front-rear direction. Therefore, as shown in FIG. 3B , the submarine prevention member 52 moves upward as the load receiving member 54 moves downward.

[0027] 2, a pair of connecting members 56 are provided at an interval in the seat width direction. Therefore, the pair of connecting members 56 are rotatably supported by the pair of side frames 36 via a pair of rotation shaft portions 58. The pair of connecting members 56 are disposed between the pair of side frames 36.

[0028] Hereinafter, when it is necessary to distinguish between the pair of connecting members 56, one connecting member 56 will be referred to as the "connecting member 56a" and the other connecting member 56 will be referred to as the "connecting member 56b." One connecting member 56a is fixed to one end of the submarine prevention member 52 in the seat width direction and one end of the load receiving member 54. The other connecting member 56b is fixed to the other end of the submarine prevention member 52 in the seat width direction and the other end of the load receiving member 54.

[0029] As shown in FIG. 3A, one of the connecting members 56a has a connecting main body portion 66 and a gear portion 68. Both ends of the connecting main body portion 66 are connected to the submarine restriction member 52 and the load receiving member 54, respectively. The gear portion 68 is arranged coaxially with the pivot shaft portion 58. The gear portion 68 is fixed to the connecting main body portion 66 and is rotatable integrally with the connecting main body portion 66. A plurality of tooth portions 69 are formed on the outer periphery of the gear portion 68. A plurality of recesses formed between the plurality of tooth portions 69 are grooves that are asymmetric in the circumferential direction.

[0030] The gear portion 68 engages with a stopper portion 70 supported by the seat frame 32. The connecting member 56 rotates in a first direction R1 about the rotating shaft portion 58 as the load-receiving member 54 moves downward. The stopper portion 70 engages with the gear portion 68 so as to restrict the connecting member 56 from rotating in a second direction R2 that is opposite to the first direction R1. The stopper portion 70 is supported by one of the side frames 36 via a support shaft portion 72 so as to be able to tilt. A claw portion 71 that engages with a tooth portion 69 of the gear portion 68 is provided at one end of the stopper portion 70. The stopper portion 70 is biased toward the gear portion 68 by a biasing member 74.

[0031] When the connecting member 56 rotates in the first direction R1, the claws 71 of the stopper portion 70 disengage from the teeth 69 of the gear portion 68. When the connecting member 56 receives a load in the second direction R2, the claws 71 of the stopper portion 70 engage with the teeth 69 of the gear portion 68, thereby preventing the connecting member 56 from rotating in the second direction R2. The gear portion 68 and the stopper portion 70 form a one-way clutch mechanism that limits the rotation direction of the connecting member 56 to only the first direction R1. Note that the teeth 69 of the gear portion 68 may be provided only on a portion of the entire circumference of the gear portion 68.

[0032] 2, the gear portion 68 is disposed between the load-receiving member 54 and the submarine-preventing member 52 in the front-rear direction. The gear portion 68 is not provided on the other connecting member 56b. Note that the gear portion 68 may be provided on both the one connecting member 56a and the other connecting member 56b.

[0033] The submarine prevention mechanism 50 provided in the vehicle seat 10 configured as described above operates as follows.

[0034] In FIG. 1, the submarine suppression mechanism 50 mounted on the vehicle seat 10 is activated when the vehicle experiences a frontal collision while an occupant is seated in the vehicle seat 10. Specifically, when the vehicle experiences a frontal collision, the occupant begins to inertially move forward relative to the vehicle seat 10. As the occupant moves inertially, a load F from the occupant is input to the load receiving member 54, as shown in FIG. 3A. The load receiving member 54 is pushed downward by this load F, causing the load receiving member 54 to descend, as shown in FIG. 3B. Because the load F in this case is equal to or greater than a predetermined magnitude, the load receiving member 54 overcomes the movement restricting portion 62 and moves to the lower portion of the guide hole 60.

[0035] As the load-receiving member 54 descends, the connecting member 56 rotates in the first direction R1 about the rotation axis Ax. This causes the submarine prevention member 52 to also rotate in the first direction R1 about the rotation axis Ax. As a result, the submarine prevention member 52 rises. This causes the submarine prevention member 52 to restrict the movement of the occupant, who would otherwise move forward due to the inertial force in the event of a frontal collision of the vehicle. This makes it possible to suppress the occurrence of the submarine phenomenon.

[0036] This embodiment has the following advantages.

[0037] As described above, the vehicle seat 10 includes the submarine prevention member 52, the load receiving member 54, and the connecting member 56. The connecting member 56 is rotatably supported on the seat frame 32 via the pivot shaft 58 located between the submarine prevention member 52 and the load receiving member 54 in the front-to-rear direction. As the load receiving member 54 moves downward, the submarine prevention member 52 moves upward. With this configuration, in the event of a collision, the load receiving member 54 is pushed downward by the load F from the occupant and moves downward, causing the submarine prevention member 52 to rise. This allows the submarine prevention member 52 and the occupant to be closer to each other, thereby preventing the submarine phenomenon.

[0038] A movement restricting portion 62 is provided on an edge 61 of a guide hole 60 formed in the seat frame 32. The movement restricting portion 62 allows downward movement of the load receiving member 54 when a load F equal to or greater than a predetermined value acts on the load receiving member 54. With this configuration, movement of the load receiving member 54 and the submarine restricting member 52 can be restricted except during a collision.

[0039] The gear portion 68 of the connecting member 56 engages with a stopper portion 70 supported by the seat frame 32. The stopper portion 70 engages with the gear portion 68 so as to restrict the connecting member 56 from rotating in a second direction R2 that is opposite to the first direction R1. With this configuration, the rotation direction of the connecting member 56 is restricted to one direction (only the first direction R1), thereby ensuring that the submarine prevention member 52 functions properly in the event of a collision.

[0040] 2, the length of the submarine prevention member 52 in the seat width direction is shorter than the distance in the seat width direction between the pair of side frames 36. With this configuration, contact between the pair of side frames 36 and the submarine prevention member 52 is suppressed, and therefore, obstruction of movement of the submarine prevention member 52 can be suppressed.

[0041] The gear portion 68 is disposed in the front-rear direction between the load receiving member 54 and the submarine restriction member 52. With this configuration, the gear portion 68 can be protected by the load receiving member 54 and the submarine restriction member 52.

[0042] The gear portion 68 is provided on only one of the pair of connecting members 56. With this configuration, the other connecting member 56, which is not provided with the gear portion 68, can be made smaller.

[0043] In the vehicle seat 10, a submarine prevention mechanism 80 according to a modified example shown in FIGS. 4 to 5B may be employed in place of the submarine prevention mechanism 50 described above.

[0044] As shown in Fig. 4, the connecting member 56M of the submarine suppression mechanism 80 has a connecting main body portion 66 and a gear portion 68A. The gear portion 68A is fixed to the connecting main body portion 66 coaxially with the rotating shaft portion 58. The submarine suppression mechanism 80 further has a motor 82 and a pinion gear 84. The motor 82 is supported by the seat frame 32. The motor 82 is disposed outward in the seat width direction (direction of arrow W) from the pair of side frames 36. The motor 82 is fixed to the outer surface of one of the side frames 36 in the seat width direction.

[0045] The gear portion 68A engages with a pinion gear 84. The pinion gear 84 is fixed to an output shaft 83 of a motor 82. The output shaft 83 passes through a hole 86 formed in the side frames 36. The pinion gear 84 is disposed between the pair of side frames 36.

[0046] The motor 82 is controlled by a control unit 88. The control unit 88 is attached to the vehicle seat 10 or the vehicle body. The control unit 88 may be an ECU (Electronic Control Unit) mounted on the vehicle. The control unit 88 has a calculation unit 90 and a memory unit 92. The calculation unit 90 is configured by a processor such as a CPU (Central Processing Unit), that is, a processing circuitry.

[0047] The submarine suppression mechanism 80 is activated when the vehicle experiences a frontal collision while an occupant is seated in the vehicle seat 10. Specifically, when the vehicle experiences a frontal collision, the occupant begins to inertially move forward relative to the vehicle seat 10. As the occupant moves inertially, a load F from the occupant is input to the load receiving member 54, as shown in FIG. 5A. The load receiving member 54 is pushed downward by this load F, causing the load receiving member 54 to descend, as shown in FIG. 5B.

[0048] Furthermore, when the control unit 88 acquires information related to a vehicle collision, the control unit 88 rotates the motor 82 to rotate the connecting member 56M in the first direction R1. Specifically, the control unit 88 determines the rotation amount of the motor 82 according to the reclining angle of the vehicle seat 10. A memory unit 92 of the control unit 88 stores motor rotation amount information, which is information related to the rotation amount of the motor 82 according to the reclining angle. In the motor rotation amount information, for example, the larger the reclining angle, the larger the rotation amount of the motor 82. A calculation unit 90 of the control unit 88 acquires information related to the reclining angle at the time of the vehicle collision and determines the rotation amount of the motor 82 according to the reclining angle. The control unit 88 rotates the motor 82 based on the determined rotation amount.

[0049] Thus, with the submarine prevention mechanism 80, the connecting member 56M rotates not only due to the input of the load F from the occupant but also due to the driving force of the motor 82. This ensures that the submarine prevention member 52 can be raised in the event of a vehicle collision. Moreover, because the motor 82 is driven based on the amount of rotation determined in accordance with the reclining angle, the submarine prevention member 52 can be raised to an appropriate height depending on the seat condition in the event of a collision. This effectively prevents the submarine phenomenon.

[0050] The following additional notes are further disclosed regarding the above embodiment.

[0051] (Appendix 1) The vehicle seat (10) of the present disclosure comprises a seat frame (32), a submarine prevention member (52) displaceable relative to the seat frame, a load-receiving member (54) displaceable relative to the seat frame and positioned rearward of the submarine prevention member, and a connecting member (56) connecting the submarine prevention member and the load-receiving member to each other, the connecting member being rotatably supported on the seat frame via a pivot shaft portion (58) positioned between the submarine prevention member and the load-receiving member in the fore-and-aft direction, and the submarine prevention member moves upward as the load-receiving member moves downward.

[0052] With this configuration, in the event of a collision, the load-receiving member is pushed downward by the load from the occupant and descends, causing the anti-submarine member to rise. This allows the anti-submarine member to be closer to the occupant, thereby preventing the submarine phenomenon.

[0053] (Appendix 2) In the vehicle seat described in Appendix 1, the load-receiving member is inserted into a guide hole (60) formed in the seat frame, and a movement restricting portion (62) that restricts downward movement of the load-receiving member is provided on an edge portion (61) of the guide hole, and the movement restricting portion may allow downward movement of the load-receiving member when a load equal to or greater than a predetermined value acts on the load-receiving member.

[0054] With this configuration, the movement of the load receiving member and the submarine restricting member can be restricted except during a collision.

[0055] (Appendix 3) In the vehicle seat described in Appendix 1, the connecting member has a gear portion (68) arranged coaxially with the pivot shaft portion, and the gear portion engages with a stopper portion (70) supported by the seat frame, and the connecting member rotates in a first direction (R1) about the pivot shaft portion as the load-receiving member moves downward, and the stopper portion may engage with the gear portion so as to restrict the connecting member from rotating in a second direction (R2) opposite to the first direction.

[0056] According to this configuration, by restricting the rotation direction of the connecting member to one direction (only the first direction), the function of the submarine prevention member can be reliably demonstrated in the event of a collision.

[0057] (Appendix 4) In the vehicle seat described in Appendix 1, the connecting member may have a gear portion (68A) arranged coaxially with the pivot shaft portion, and the gear portion may engage with a pinion gear (84) provided on a motor (82) supported by the seat frame, and the motor may be controlled by a control unit (88), which may determine the amount of rotation of the motor in accordance with a reclining angle of a seat back (16) relative to a seat cushion (14) of the vehicle seat, and may rotate the motor based on the amount of rotation.

[0058] According to this configuration, the motor is rotated in accordance with the reclining state of the vehicle seat at the time of a collision, thereby making it possible to appropriately move the submarine restricting member.

[0059] (Appendix 5) In the vehicle seat described in Appendix 4, the seat frame may have a pair of side frames (36) spaced apart from each other in the seat width direction, and the motor may be positioned outboard of the pair of side frames in the seat width direction.

[0060] This configuration can prevent contact between the motor and the occupant during a collision, and also ensures an area for arranging the pinion gear and the connecting member.

[0061] (Appendix 6) In the vehicle seat described in Appendix 1, the seat frame has a pair of side frames spaced apart from each other in the seat width direction, and the length of the submarine restraining member in the seat width direction may be shorter than the distance between the pair of side frames in the seat width direction.

[0062] With this configuration, contact between the pair of side frames and the submarine prevention member is suppressed, thereby suppressing obstruction to the movement of the submarine prevention member.

[0063] (Supplementary Note 7) In the vehicle seat described in Supplementary Note 3 or 4, the gear portion may be disposed between the load receiving member and the submarine restricting member in the front-rear direction.

[0064] With this configuration, the gear portion can be protected by the load-receiving member and the submarine-preventing member.

[0065] (Appendix 8) In the vehicle seat described in Appendix 3 or 4, the connecting members may be provided in a pair spaced apart in the seat width direction, and the gear portion may be provided on only one of the pair of connecting members.

[0066] With this configuration, the other connecting member, which is not provided with a gear portion, can be made smaller.

[0067] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values ​​or mathematical expressions are used in the description of the above-described embodiments. [Explanation of symbols]

[0068] 10...Vehicle seat 14...Seat cushion 16...Seat back 32...Seat frame 36...Side frame 52...Submarine control member 54... Load-receiving member 56, 56a, 56b, 56M... Connecting member 58... Rotating shaft portion 60... Guide hole 62...Movement restriction portion 68, 68A...Gear portion 70...Stopper portion 82...Motor 84...Pinion gear 88...Control unit

Claims

1. The seat frame and a submarine-restricting member displaceable relative to the seat frame; a load receiving member that is displaceable relative to the seat frame and is disposed rearward of the submarine prevention member; a connecting member that connects the submarine restricting member and the load receiving member to each other, the connecting member is rotatably supported by the seat frame via a pivot shaft portion located between the submarine restricting member and the load receiving member in the front-rear direction, The vehicle seat, wherein the submarine restricting member moves upward in response to downward movement of the load receiving member.

2. The vehicle seat according to claim 1, The load-receiving member is inserted into a guide hole formed in the seat frame, a movement restricting portion that restricts downward movement of the load receiving member is provided on an edge portion of the guide hole; The movement restricting portion allows downward movement of the load receiving member when a load equal to or greater than a predetermined value acts on the load receiving member.

3. The vehicle seat according to claim 1, the connecting member has a gear portion that is arranged coaxially with the rotation shaft portion, the gear portion engages with a stopper portion supported by the seat frame, the connecting member rotates in a first direction about the rotation shaft portion as the load receiving member moves downward, The stopper portion engages with the gear portion so as to restrict the connecting member from rotating in a second direction opposite to the first direction.

4. The vehicle seat according to claim 1, the connecting member has a gear portion that is arranged coaxially with the rotation shaft portion, the gear portion engages with a pinion gear provided on a motor supported by the seat frame, The motor is controlled by a control unit, The control unit determines a rotation amount of the motor in accordance with a reclining angle of a seat back relative to a seat cushion of the vehicle seat, and rotates the motor based on the rotation amount.

5. The vehicle seat according to claim 4, The seat frame has a pair of side frames arranged at an interval in the seat width direction, The vehicle seat, wherein the motor is disposed outward in the seat width direction from the pair of side frames.

6. The vehicle seat according to claim 1, The seat frame has a pair of side frames arranged at an interval in the seat width direction, A vehicle seat, wherein the length of the submarine prevention member in the seat width direction is shorter than the distance between the pair of side frames in the seat width direction.

7. The vehicle seat according to claim 3 or 4, The gear portion is disposed between the load receiving member and the submarine restricting member in the front-rear direction.

8. The vehicle seat according to claim 3 or 4, The connecting members are provided as a pair at an interval in the seat width direction, The vehicle seat, wherein the gear portion is provided on only one of the pair of connecting members.

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