Backrest and cushion quick return mechanism for passive safety of zero-gravity seat

Abstract

The invention relates to the technical field of automobile seats, in particular to a backrest and cushion quick return mechanism for passive safety of a zero-gravity seat, which is characterized in that an unlocking arm is driven to rotate by a backrest ignition component during collision, so that a pawl is separated from a ratchet wheel, and the locking state of an angle adjuster is instantly released; the backrest framework can drag the safety belt forwards due to inertia of a passenger during collision, so that the backrest is pulled to realize quick return; and meanwhile, due to the dual locking mechanism of the pawl and the ratchet wheel, the stability of daily use is guaranteed, and reliable unlocking under the emergency condition is also guaranteed. The cushion ignition assembly enables the cushion inner frame to rapidly reset under the action of human body pressure by releasing constraint of the cushion limiting structure on the motor fixing support, the two mechanisms work cooperatively, and the potential safety hazard that a traditional electric adjusting seat cannot rapidly reset due to the fact that a motor is locked during collision is effectively solved; the quick resetting of the backrest and the seat cushion is realized, the safety protection on passengers is improved, and the injury of collision to a human body is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, specifically to a rapid return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats. Background Technology

[0002] Zero-gravity seats are highly comfortable seats with multi-directional adjustments. Through combinations of adjustments such as backrest angle, leg rest angle and extension length, and seat cushion height and angle, occupants can adjust to their most comfortable posture according to their individual needs, effectively relieving joint pressure and significantly improving the riding experience. When the seat enters zero-gravity mode, the front of the seat frame lifts upwards, the backrest tilts backwards, and the leg rest slightly rises. This special configuration simulates the body's state in a weightless environment, providing occupants with an ultimate relaxation experience. However, behind this high level of comfort lies a significant safety hazard: due to the significant change in the occupant's body position in the reclining position, the adjustment range of traditional seat belts is difficult to effectively adapt to this special posture, resulting in a significant reduction in their restraint effectiveness. More importantly, in a sudden collision, if the tilted backrest and raised seat cushion cannot quickly return to the standard safe position, it will severely weaken the seat's protective function and directly threaten the occupant's personal safety. This contradiction between comfort and safety has become a key issue that urgently needs to be addressed in the current development of zero-gravity seat technology. Summary of the Invention

[0003] To address the problems existing in the prior art, a rapid return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats is provided. This mechanism enables the backrest frame and seat inner frame to be quickly unlocked during a vehicle collision, allowing them to return to their original positions quickly under inertia. This solves the problem that existing zero-gravity seats cannot quickly return to their standard safe positions when the tilted backrest and raised seat cushion are in a sudden collision.

[0004] To address the problems of existing technologies, this invention provides a rapid return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats. This mechanism is used to return the backrest frame and the inner frame of the seat cushion to their original positions relative to the outer frame. The backrest frame has side plates on both sides, and the fixed side plates are hinged to the outer frame of the seat cushion via an angle adjuster. A screw motor connects the inner and outer frames of the seat cushion to adjust the angle of the inner frame. The rapid return mechanism includes: a first ignition assembly fixed to the backrest frame; an unlocking arm rotatably mounted on the side plate of the frame and driven by the first ignition assembly, with a limit groove on the unlocking arm; a pawl hinged to the backrest frame via a second rotating shaft, with a first protrusion on its outer side; and a ratchet fixed between the angle adjuster and a first friction disc, with the pawl and ratchet engaged. The first protrusion of the pawl is accommodated in the limiting groove of the unlocking arm; the seat cushion quick return mechanism includes: a motor fixing bracket connected between the fixed end of the lead screw motor and the outer frame of the seat cushion; a seat cushion limiting structure located between the motor fixing bracket and the outer frame of the seat cushion for limiting the rotation of the motor fixing bracket relative to the outer frame of the seat cushion; and a seat cushion ignition assembly located on the outside of the outer frame of the seat cushion and connected to the seat cushion limiting structure. When a vehicle collision occurs and the vehicle system detects that the inner frame of the seat cushion is not in its initial position, the first ignition assembly drives the pawl to disengage from the ratchet to release the locking of the angle adjuster. The seat cushion ignition assembly drives the seat cushion limiting structure to release the locking of the motor fixing bracket. The backrest frame returns to its original position relative to the outer frame of the seat cushion under its own restoring force, and the inner frame of the seat cushion drives the motor fixing bracket to return to its original position relative to the outer frame of the seat cushion under the pressure of the human body.

[0005] Preferably, the backrest quick return mechanism further includes a cam, which is hinged to the backrest frame via a first rotating shaft and fixedly connected to the unlocking arm. The cam has a protrusion offset from the first rotating shaft, and the pawl is provided with a groove that can couple with the protrusion.

[0006] Preferably, the backrest quick return mechanism also includes a base plate and a cover plate connected to the frame side plate, with the cam, pawl and unlocking arm all disposed between the base plate and the cover plate.

[0007] Preferably, the limiting groove of the unlocking arm has a convex section and a concave section. When the first convex bud on the pawl slides from the concave section to the convex section, the pawl rotates around the second rotation axis and unlocks with the ratchet.

[0008] Preferably, the backrest quick return mechanism also includes a tension spring, with its two ends connected to the unlocking arm and the cover plate, respectively.

[0009] Preferably, the front and rear ends of the inner frame of the seat cushion are respectively provided with a front connecting rod and a rear connecting rod that are rotatably connected thereto, and the other end of the front connecting rod and the rear connecting rod are rotatably connected to the outer frame of the seat cushion.

[0010] Preferably, the motor mounting bracket is rotatably connected to the seat cushion outer frame. The top of the motor mounting bracket is provided with a groove, and the two sides of the seat cushion outer frame are provided with waist-shaped grooves extending in the vertical direction. The seat cushion limiting structure includes: a limiting shaft, which passes through the bottom of the waist-shaped groove and one end of which extends into the groove of the motor mounting bracket; an anti-detachment bolt, which is fixedly connected to the other end of the limiting shaft to limit the limiting shaft to the bottom of the waist-shaped groove; a swing arm, which is rotatably provided on the outside of the seat cushion outer frame by a stepped bolt, and one end of which abuts against the bottom end of the anti-detachment bolt; and a second ignition assembly, which is provided on the outside of the seat cushion outer frame and whose traction part is connected to the other end of the swing arm.

[0011] Preferably, the motor mounting bracket is rotatably connected to the seat cushion outer frame, and the top of the motor mounting bracket is provided with an insertion hole. The seat cushion limiting structure includes a pin that vertically penetrates the outer side of the seat cushion outer frame and extends into the insertion hole; and a third ignition assembly that is fixedly installed on the outer side of the seat cushion outer frame and connected to the pin. When the vehicle collides, the third ignition assembly pulls the pin out of the insertion hole.

[0012] Preferably, the backrest quick return mechanism further includes a first friction disc, which is disposed between the frame side plate and the ratchet, and the first friction disc is fixedly connected to the ratchet.

[0013] Preferably, a third friction disc is provided at the connection position between the motor fixing bracket and the outer frame of the seat cushion.

[0014] The advantages of this application compared to the prior art are:

[0015] This application utilizes a backrest ignition assembly that drives the unlocking arm to rotate upon impact, disengaging the pawl from the ratchet and instantly releasing the locking state of the seat adjuster. This allows the backrest frame to quickly return to its original position due to the occupant's inertia pulling forward on the seatbelt during a collision. Simultaneously, the dual locking mechanism of the pawl and ratchet ensures both stability during daily use and reliable unlocking in emergencies. The seat cushion ignition assembly releases the constraint of the seat cushion limiting structure on the motor mounting bracket, allowing the inner frame of the seat cushion to quickly reset under the pressure of the human body. The two mechanisms work together to effectively solve the safety hazard of traditional electrically adjustable seats where the motor locks during a collision, preventing rapid reset. This achieves rapid reset of the backrest and seat cushion, improving occupant safety and reducing injuries from collisions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a quick return mechanism for the backrest and seat cushion of a zero-gravity seat for passive safety, according to the present invention.

[0017] Figure 2 This is an exploded perspective view of the quick return mechanism of the backrest in a backrest and cushion quick return mechanism for passive safety of zero-gravity seats according to the present invention.

[0018] Figure 3 This is a schematic diagram of the backrest quick return mechanism after removing the cover plate in the locked state of the backrest and seat cushion quick return mechanism for passive safety of zero gravity seats according to the present invention.

[0019] Figure 4 This is a schematic diagram of the quick return mechanism of the backrest and cushion for passive safety of a zero-gravity seat, after the unlocking arm is removed when the mechanism is locked.

[0020] Figure 5 This is a schematic diagram of the backrest quick return mechanism after removing the cover plate in the unlocked state of the backrest and cushion quick return mechanism for passive safety of zero gravity seats according to the present invention.

[0021] Figure 6 This is a schematic diagram of the quick return mechanism of the backrest and cushion for passive safety of a zero-gravity seat, after the unlocking arm has been removed in the unlocked state.

[0022] Figure 7 This is an inner schematic diagram of the seat cushion quick return mechanism in the locking state of the first embodiment of the quick return mechanism of the backrest and seat cushion for passive safety of zero gravity seats according to the present invention.

[0023] Figure 8 This is an outer schematic diagram of the first embodiment of the quick return mechanism of the cushion in the locking state of the backrest and cushion quick return mechanism for passive safety of zero-gravity seats according to the present invention.

[0024] Figure 9 This is an outer schematic diagram of the seat cushion quick return mechanism in the unlocked state of the first embodiment of the quick return mechanism of the backrest and seat cushion for passive safety of zero gravity seats according to the present invention.

[0025] Figure 10 This is a schematic diagram of the maximum angle between the inner frame of the seat cushion and the outer frame of the seat cushion in a quick return mechanism for the backrest and seat cushion used for passive safety of zero-gravity seats according to the present invention.

[0026] Figure 11 This is an outer schematic diagram of the second embodiment of the quick return mechanism of the cushion in the locking state of the backrest and cushion quick return mechanism for passive safety of zero-gravity seats according to the present invention.

[0027] Figure 12 This is an inner schematic diagram of the seat cushion quick return mechanism in the locking state of a second embodiment of the quick return mechanism for the backrest and seat cushion of a zero-gravity seat for passive safety of the present invention.

[0028] The diagram is labeled as follows: 1. Backrest frame; 101. Frame side plate; 2. Angle adjuster; 3. Brushless backrest motor; 4. Seat cushion frame; 401. Outer frame; 402. Inner frame; 403. Front connecting rod; 404. Rear connecting rod; 405. Lead screw motor body; 406. Lead screw motor pull sleeve; 407. Motor mounting bracket; 5. Backrest quick return mechanism; 501. First ignition assembly; 502. First pull cable; 503. First pull cable mounting bracket; 504. Cam; 5041. Second convex bulge; 505. Pawl; 5051. First convex bulge Package; 506, ratchet; 507, unlocking arm; 5071, limiting groove; 508, tension spring; 509, first rotating shaft; 510, second rotating shaft; 511, base plate; 512, cover plate; 513, first friction disc; 601, second ignition assembly; 602, second pull cable; 603, second pull cable fixing bracket; 604, swing arm; 605, step bolt; 606, limiting shaft; 607, anti-loosening bolt; 608, second friction disc; 701, third ignition assembly; 702, third pin; 703, third friction disc. Detailed Implementation

[0029] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1-6As shown, a quick return mechanism for a backrest and seat cushion for passive safety in a zero-gravity seat is used to return the backrest frame 1 and the inner seat cushion frame 402 to their original positions relative to the outer seat cushion frame 401. The backrest frame 1 has side plates 101 on both sides, and the fixed side plates are hinged to the outer seat cushion frame 401 via an angle adjuster 2. A screw motor connects the inner seat cushion frame 402 and the outer seat cushion frame 401 to adjust the angle of the inner seat cushion frame 402. The quick return mechanism includes: a backrest quick return mechanism 5 including: a first... An ignition assembly 501 is fixed to the backrest frame 1; an unlocking arm 507 is rotatably mounted on the side plate 101 of the frame and is connected to the first ignition assembly 501 in a transmission manner, and a limit groove 5071 is provided on the unlocking arm 507; a pawl 505 is hinged to the backrest frame 1 through a second rotating shaft 510, and a first protrusion 5051 is provided on the outer side of the pawl 505; a ratchet 506 is fixed between the angle adjuster 2 and the first friction disc 513, and the pawl 505 and the ratchet 506 are engaged and connected. Furthermore, the first protrusion 5051 of the pawl 505 is accommodated within the limiting groove 5071 of the unlocking arm 507; the seat cushion quick return mechanism includes: a motor fixing bracket 407, connected between the fixed end of the lead screw motor and the seat cushion outer frame 401; a seat cushion limiting structure, disposed between the motor fixing bracket 407 and the seat cushion outer frame 401, used to limit the rotation of the motor fixing bracket 407 relative to the seat cushion outer frame 401; and a seat cushion ignition assembly, disposed on the outside of the seat cushion outer frame 401 and connected to the seat cushion limiting structure. Connection; When a vehicle collision occurs and the vehicle system detects that the inner frame 402 of the seat cushion is not in its initial position, the first ignition assembly 501 drives the pawl 505 to disengage from the ratchet 506 to release the locking of the angle adjuster 2. The seat cushion ignition assembly drives the seat cushion limiting structure to release the locking of the motor fixing bracket 407. The backrest frame 1 returns to its original position relative to the outer frame 401 under its own restoring force. Under the pressure of the human body, the inner frame 402 of the seat cushion drives the motor fixing bracket 407 to return to its original position relative to the outer frame 401 of the seat cushion.

[0031] The angle adjuster 2 includes an outer ring fixedly connected to the outer frame 401 of the seat cushion and an inner ring that can rotate relative to the outer ring. It also includes a brushless backrest motor 3 and a spline shaft. The brushless backrest motor 3 is set in the backrest frame 1. The two ends of the spline shaft extend into the inner ring of the two side adjusters and are splined to them. The brushless backrest motor 3 is splined to the spline shaft. When the brushless backrest motor 3 is started, the spline shaft drives the inner ring to rotate relative to the outer ring, thereby adjusting the angle of the backrest frame 1.

[0032] The ratchet 506 is fixedly connected to the inner ring of the angle adjuster 2. When no collision occurs, the pawl 505 and the ratchet 506 are locked so that the rotating spline shaft can adjust the angle of the backrest frame 1. When a collision occurs, because the inner ring of the angle adjuster 2 is locked relative to its outer ring, the spline shaft cannot quickly drive the backrest frame 1 to reset. The pawl 505 and the ratchet 506 are unlocked, and the backrest frame 1 is unlocked to the ratchet 506, so that the backrest frame 1 can rotate relative to the ratchet 506 and the locked inner ring of the adjuster, thereby facilitating the reset of the backrest frame 1.

[0033] like Figures 3-6 As shown, the backrest quick return mechanism 5 also includes a cam 504, which is hinged to the backrest frame 1 via a first rotating shaft 509 and fixedly connected to an unlocking arm 507. The cam 504 has a protrusion that deviates from the first rotating shaft 509, and the pawl 505 is provided with a groove that can couple with the protrusion.

[0034] like Figure 2 As shown, the backrest quick return mechanism 5 also includes a base plate 511 and a cover plate 512 connected to the frame side plate 101. The cam 504, pawl 505 and unlocking arm 507 are all arranged between the base plate 511 and the cover plate 512.

[0035] like Figures 3-6 As shown, the limiting groove 5071 of the unlocking arm 507 has a convex section and a concave section. When the first convex 5051 on the pawl 505 slides from the concave section to the convex section, the pawl 505 rotates around the second rotating axis 510 and unlocks with the ratchet 506.

[0036] The limiting groove 5071 of the unlocking arm 507 achieves progressive unlocking control of the pawl 505 through its contour curve. When the first ignition assembly 501 is triggered, the unlocking arm 507 drives the limiting groove 5071 to rotate, causing the first protrusion 5051 on the pawl 505 to slide from the initial locking position of the concave section along the groove wall to the unlocking position of the protrusion section. During this process, the interaction between the first protrusion 5051 and the limiting groove 5071 generates a lever effect, forcing the pawl 505 to generate a precise rotational displacement around the second rotation axis 510, thereby reliably disengaging from the ratchet 506. This convex-concave fit mechanical design not only ensures the smoothness and controllability of the unlocking action, but also provides a clear endpoint position for the pawl 505 through the structural limitation of the protrusion section, effectively preventing overshoot or incomplete unlocking.

[0037] Furthermore, the transition area between the convex and concave sections of the limiting groove 5071 adopts a gradient curved surface design, which enables the first convex hull 5051 to transition smoothly during sliding, avoiding impact vibration; at the same time, the depth of the concave section and the height of the convex section are precisely calculated to ensure sufficient holding force in the locked state, while only a small driving force is needed to complete the action when unlocking.

[0038] like Figures 3-6 As shown, the backrest quick return mechanism 5 also includes a tension spring 508, with both ends of the tension spring 508 connected to the unlocking arm 507 and the cover plate 512, respectively.

[0039] In the quick-return mechanism 5 of the backrest, the tension spring 508 plays a crucial pre-tensioning role. One end is fixed to the unlocking arm 507, and the other end is connected to the cover plate 512. Through continuous tension, it keeps the pawl 505 engaged with the ratchet 506. This design ensures that, under non-collision conditions, the first protrusion 5051 of the pawl 505 can be stably locked in the recess of the limiting groove 5071, thereby maintaining the reliable locking of the adjuster 2. When a collision occurs, the driving force generated by the first ignition assembly 501 must overcome the pre-tension force of the tension spring 508 to push the unlocking arm 507 to rotate. This force balance design ensures stability in daily use and enables quick unlocking in emergency situations.

[0040] like Figure 7 As shown, the front end and rear end of the inner frame 402 of the seat cushion are respectively provided with a front connecting rod 403 and a rear connecting rod 404 that are rotatably connected thereto. The other end of the front connecting rod 403 and the rear connecting rod 404 are rotatably connected to the outer frame 401 of the seat cushion.

[0041] The front and rear ends of the inner seat frame 402 are stably rotatably connected to the outer seat frame 401 via a front connecting rod 403 and a rear connecting rod 404, respectively. This symmetrical linkage structure can precisely convert the linear motion of the lead screw motor into angle adjustment of the inner seat frame 402 when the motor is started. Specifically, when the output lead screw of the lead screw motor rotates relative to the motor sleeve, it generates axial displacement. This displacement, through the coordinated motion of the four-bar linkage, drives the inner seat frame 402 to achieve a smooth angle change. The equal length design of the front connecting rod 403 and the rear connecting rod 404 ensures that the inner frame 402 maintains parallel movement during adjustment, avoiding unnecessary offset or jamming.

[0042] like Figure 8 , Figure 9 and Figure 10As shown, the motor fixing bracket 407 is fixedly connected to the seat cushion outer frame 401 (becoming a rotatable connection after unlocking via the second friction disc 608). The top of the motor fixing bracket 407 is provided with a groove, and the two sides of the seat cushion outer frame 401 are provided with waist-shaped grooves extending in the vertical direction. The seat cushion limiting structure includes a limiting shaft 606, which is disposed through the bottom of the waist-shaped groove, with one end extending into the groove of the motor fixing bracket 407; an anti-detachment bolt 607, which is fixedly connected to the other end of the limiting shaft 606 to limit the limiting shaft 606 to be at the bottom of the waist-shaped groove; a swing arm 604, which is rotatably disposed on the outside of the seat cushion outer frame 401 via a stepped bolt 605, with one end abutting against the bottom end of the anti-detachment bolt 607; and a backrest ignition assembly including a second ignition assembly 601, which is disposed on the outside of the seat cushion outer frame 401, with its traction part connected to the other end of the swing arm 604.

[0043] like Figure 11 and Figure 12 As shown, the motor mounting bracket 407 is fixedly connected to the seat outer frame 401 (becoming a rotatable connection after unlocking via the second friction disc 608). The top of the motor mounting bracket 407 is provided with an insertion hole. The seat limiting structure includes a pin, which vertically penetrates the outside of the seat outer frame 401 and extends into the insertion hole; and a third ignition assembly 701, which is fixedly disposed on the outside of the seat outer frame 401 and connected to the pin. In the event of a vehicle collision, the third ignition assembly 701 pulls the pin out of the insertion hole.

[0044] like Figure 2 As shown, the backrest quick return mechanism 5 also includes a first friction disc 513, which is disposed between the frame side plate 101 and the ratchet 506, and the first friction disc 513 is fixedly connected to the ratchet 506.

[0045] like Figure 11 and Figure 12 As shown, a second friction disc 608 and a third friction disc 703 are provided at the connection position between the motor fixing bracket 407 and the seat cushion outer frame 401.

[0046] A quick backrest return mechanism 5 based on a zero-gravity seat includes: a backrest frame 1 and an adjuster 2. The backrest frame 1 is hinged to the seat cushion frame 4 through the adjusters 2 on both sides. The quick backrest return mechanism 5 is installed between the backrest frame 1 and the adjuster 2.

[0047] The quick return mechanism 5 for the backrest includes a first ignition assembly 501 and a pull cable mounted on the side plate 101 of the frame. The base plate 511 of the quick return mechanism 5 is fixedly connected to the side plate 101 of the frame. The quick return mechanism 5 also includes an outermost cover plate 512 connected to the base plate 511 via a first rotating shaft 509 and a second rotating shaft 510.

[0048] It also includes a cam 504 hinged to the base plate 511 and rotating under the action of the first ignition assembly 501 and the pull cable, an unlocking arm 507, a first rotating shaft 509, and a pawl 505 rotating under the push of the limiting protrusion of the unlocking arm 507.

[0049] The pawl 505 is connected to the base plate 511 and the cover plate 512 via the second rotating shaft 510. The unlocking arm 507 and the cam 504 are rotatably connected to the base plate 511 and the cover plate 512 via the first rotating shaft 509. The pawl 505 is connected to the ratchet 506 via a locking / slot engagement and to the first friction disc 513 connecting the ratchet 506 to the frame side plate 101. One side of the first friction disc 513 is fixed to the frame side plate 101, and the other side is fixed to the ratchet 506. The first friction disc 513 is used to unlock after a vehicle collision and make the ratchet 506 rotate relative to the backrest frame 1. The side of the ratchet 506 away from the first friction disc 513 is fixed to the angle adjuster 2. The unlocking arm 507 is provided with a tension spring 508 connected to the cover plate 512.

[0050] Before a vehicle collision, the pawl 505 and ratchet 506 engage in a locking mechanism, causing the pawl 505 and ratchet 506 to rotate synchronously. When a collision occurs, if various sensors on the vehicle body detect that the seat back is not in the designed position, the vehicle's infotainment system outputs a signal to the first ignition assembly 501.

[0051] The first ignition assembly 501 rotates by dragging the unlocking arm 507 via the first pull cable 502. The unlocking arm 507 pushes the pawl 505 protrusion through the limiting groove 5071. Additionally, the unlocking arm 507 drives the cam 504 to rotate via the cam protrusion, releasing the downward pressure on the pawl 505. This causes the pawl 505 to rotate, disengaging from the groove of the ratchet 506 and unlocking the backrest frame 1. The first friction disc 513 unlocks after a vehicle collision, causing the ratchet 506 to rotate relative to the backrest frame 1, allowing the backrest frame 1 to quickly return to its original position.

[0052] First example of a seat cushion quick return mechanism:

[0053] A seat cushion quick return mechanism based on a zero-gravity seat includes: a seat cushion frame 4, the main components of which are an outer seat cushion frame 401, an inner seat cushion frame 402, a front connecting rod 403, and a rear connecting rod 404; a lead screw motor (which includes a lead screw motor body 405, a lead screw motor sleeve 406, a motor fixing bracket 407, and a motor fixing bolt) as the drive source; the lead screw motor adjusts the angle of the inner seat cushion frame 402 to the required seat cushion tilt angle; and the outer seat cushion frame 401 ensures the overall high strength of the seat frame.

[0054] The seat cushion outer frame 401 is equipped with a seat cushion quick return mechanism, which includes a second ignition assembly 601, a second pull cable 602 and a second pull cable 602 fixing bracket fixedly installed on the seat cushion outer frame 401, and a swing arm 604 rotatably installed on the seat cushion outer frame 401.

[0055] The limiting shaft 606 is axially fixed by the anti-loosening bolt 607, so that it can only move in the waist-shaped groove. When the design position is reached, the limiting shaft 606 can restrict the rotation of the motor fixing bracket 407. The motor fixing bracket 407 is rotatably connected to the outer frame of the seat cushion 401 through the second friction disc 608.

[0056] Before a vehicle collision, the engagement of the limiting shaft 606 with the grooves of the outer seat frame 401 and the motor mounting bracket 407 prevents relative rotation between the motor mounting bracket 407 and the outer seat frame 401 when the inner seat frame 402 is adjusted at its normal angle (especially when the inner seat frame 402 is tilted to its maximum and the motor mounting bracket 407 is under maximum force). When a collision occurs, if the vehicle system sensors detect that the inner seat frame 402 is not in its initial position, the vehicle system outputs a signal to the second ignition assembly 601, triggering the second ignition... The component 601 pulls the cable, causing the swing arm 604 to rotate, which in turn pushes the limit shaft 606 upward. When the limit shaft 606 moves to the highest position, the limit on the motor fixing bracket 407 is released. Thus, under the action of the body's downward tilting force, the seat cushion tilt angle can quickly return from the highest angle position to the initial position. During the return process, because the motor fixing bracket 407 and the seat cushion outer frame 401 rotate relative to each other, the second friction disc 608 is activated, absorbing excessive energy and preventing injury to the body.

[0057] A second example of a seat cushion quick return mechanism:

[0058] The third ignition assembly 701 is a pin-type structure, which is fixedly connected to the side of the seat outer frame 401 by bolts. Its pin passes through the side of the seat outer frame 401 and is matched and fixed with the motor mounting bracket 407. When the inner frame 402 of the seat cushion is adjusted at its normal angle, the motor fixing bracket 407 and the outer frame 401 of the seat cushion will not rotate relative to each other (especially when the tilt angle of the inner frame 402 of the seat cushion is raised to the maximum and the force on the motor fixing bracket 407 is at its maximum). When the vehicle body collides, when the vehicle system sensor detects that the seat is not in the initial position, the vehicle system outputs a signal to the third ignition assembly 701. The third ignition assembly 701 uses internal propellant to pull the pin out of the motor fixing bracket 407, thereby releasing the limitation on the motor fixing bracket 407. Thus, under the action of the body's downward tilting force, the tilt angle of the inner frame 402 of the seat cushion can quickly return from the highest angle position to the initial position. During the return process, because the motor fixing bracket 407 and the outer frame 401 of the seat cushion rotate relative to each other, the third friction disc 703 is activated to absorb excessive energy and avoid injury to the human body.

[0059] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A rapid return mechanism for a backrest and seat cushion for passive safety in a zero-gravity seat, used to return the backrest frame and the inner frame of the seat cushion to their original positions relative to the outer frame, wherein the backrest frame has side plates on both sides, the fixed side plates are hinged to the outer frame of the seat cushion via an angle adjuster, and a lead screw motor is connected between the inner frame of the seat cushion and the outer frame of the seat cushion to adjust the angle of the inner frame of the seat cushion, characterized in that... The rapid return mechanism includes: The quick return mechanism for the backrest includes: The first ignition assembly is fixed to the backrest frame; The unlocking arm is rotatably mounted on the side plate of the frame and is connected to the first ignition assembly via a transmission. A limit groove is provided on the unlocking arm. The pawl is hinged to the backrest frame via a second rotating shaft, and a first protrusion is provided on the outer side of the pawl; The ratchet is fixed between the angle adjuster and the first friction disc. The pawl is engaged with the ratchet, and the first protrusion of the pawl is accommodated in the limiting groove of the unlocking arm. The seat cushion quick return mechanism includes: The motor mounting bracket is connected between the fixed end of the lead screw motor and the outer frame of the seat cushion. A seat cushion limiting structure is provided between the motor fixing bracket and the seat cushion outer frame to restrict the rotation of the motor fixing bracket relative to the seat cushion outer frame; The seat cushion ignition assembly is located on the outer side of the seat cushion frame and connected to the seat cushion limiting structure. When a collision occurs and the vehicle system detects that the inner frame of the seat cushion is not in its initial position, the first ignition assembly drives the pawl to disengage from the ratchet to release the locking of the seat adjuster. The seat cushion ignition assembly drives the seat cushion limiting structure to release the locking of the motor fixing bracket. The backrest frame returns to its original position relative to the outer frame of the seat cushion under its own restoring force. Under the pressure of the human body, the inner frame of the seat cushion drives the motor fixing bracket to return to its original position relative to the outer frame of the seat cushion.

2. The quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 1, characterized in that, The quick return mechanism for the backrest also includes a cam, which is hinged to the backrest frame via a first rotating shaft and fixedly connected to an unlocking arm. The cam has a protrusion offset from the first rotating shaft, and the pawl is provided with a groove that can couple with the protrusion.

3. The quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 2, characterized in that, The quick return mechanism for the backrest also includes a base plate and a cover plate connected to the side plate of the frame, with the cam, pawl, and unlocking arm all located between the base plate and the cover plate.

4. A quick-return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to any one of claims 1-3, characterized in that, The limiting groove of the unlocking arm has a convex section and a concave section. When the first convex bud on the pawl slides from the concave section to the convex section, the pawl rotates around the second rotation axis and unlocks with the ratchet.

5. A quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 3, characterized in that, The quick return mechanism for the backrest also includes a tension spring, with its two ends connected to the unlocking arm and the cover plate, respectively.

6. The quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 1, characterized in that, The front and rear ends of the inner frame of the seat cushion are respectively provided with a front link and a rear link that are rotatably connected to it, and the other end of the front link and the rear link are rotatably connected to the outer frame of the seat cushion.

7. A quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 6, characterized in that, The motor mounting bracket is fixedly connected to the outer frame of the seat cushion (becoming a rotatable connection via a second friction disc after unlocking). The top of the motor mounting bracket has a groove, and the two sides of the outer frame of the seat cushion have waist-shaped grooves extending vertically. The seat cushion limiting structure includes… A limiting shaft is provided through the bottom of the waist-shaped groove, with one end extending into the groove of the motor fixing bracket; Anti-loosening bolts are fixedly connected to the other end of the limiting shaft to restrict the limiting shaft from being at the bottom of the waist-shaped groove; The swing arm is rotatably mounted on the outside of the seat cushion frame via a step bolt, with one end abutting against the bottom end of the anti-slip bolt. The backrest ignition assembly includes a second ignition assembly located on the outer side of the seat cushion frame, with its traction part connected to the other end of the swing arm.

8. A quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 6, characterized in that, The motor mounting bracket is fixedly connected to the outer frame of the seat cushion (after unlocking, it becomes a rotatable connection via a third friction disc), and the top of the motor mounting bracket has a socket. The seat cushion limiting structure includes, The pin penetrates vertically through the outer side of the seat cushion frame and extends into the insertion hole; The third ignition assembly is fixedly installed on the outer side of the seat cushion frame and connected to the pin. In the event of a vehicle collision, the third ignition assembly will pull the pin out of the socket.

9. A quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 1, characterized in that, The quick return mechanism for the backrest also includes a first friction disc, which is disposed between the frame side plate and the ratchet, and the first friction disc is fixedly connected to the ratchet.

10. A quick return mechanism for the backrest and seat cushion for passive safety in zero-gravity seats according to claim 1, characterized in that, A second friction disc and a third friction disc are provided at the connection position between the motor mounting bracket and the outer frame of the seat cushion.

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