A friction force relief system suitable for protecting the occupant of a car seat

Abstract

The present application relates to the technical field of automobile seat, especially to a friction force unloading system suitable for passenger safety protection of automobile seat, comprising a backrest framework, a cushion framework support, an angle adjuster and a friction force unloading assembly, the friction force unloading assembly is embedded between the cushion framework support and the angle adjuster, and is composed of a friction disc driving disc, a driven disc, a mounting plate and bolts; concentric sliding is realized through an arc-shaped positioning groove, and the unloading threshold is accurately set by combining a torque pretightening force formula and a gradient fastening process; rigidity locking is maintained in daily working conditions, and when the overturning moment exceeds the limit in a collision, friction sliding is triggered to dissipate kinetic energy, and posture self-adaptive regulation and control are realized by cooperating with a limiting boss and the angle adjuster self-locking. The present application can solve the problems of lacking collision energy directional dissipation mechanism and seat posture self-adaptive adjustment scheme in the safety design of traditional seats in the prior art.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more particularly to a friction relief system suitable for the safety protection of automotive seat occupants. Background Technology

[0002] With the continuous improvement in the demand for car seat comfort, new seat types such as zero-gravity seats and large-angle reclining seats are becoming increasingly popular in passenger vehicles. These types of seats typically adjust the angle between the backrest and the seat cushion to... While a near-flat reclining position can significantly improve passenger comfort, it also exposes serious safety hazards in frontal collisions. Existing safety protection technologies for high-angle seats have the following core defects: 1. Significant risk of lumbar spine overload injury to occupants: In a frontal collision, occupants in a steeply reclined seating position are thrown forward by inertia. While the pelvis is restrained by the seatbelt, the upper torso continues to move forward, forcing the spine to bend violently around the pelvis. This results in the lumbar spine, especially the L3-L4 segments, experiencing extremely high compressive bending moments. Collision tests have verified this. At frontal collision speeds, the lumbar load on occupants in reclining seats can be more than 3.2 times that of a standard sitting posture. Existing seats generally use rigid locking angle adjusters such as toothed plates and ratchet types, which completely restrict backrest rotation under collision conditions. The impact energy is directly transmitted to the occupant's lumbar spine through the seat frame, which can easily cause irreversible damage to the physiological structure of the lumbar spine.

[0003] 2. Lack of Collision Energy Absorption Mechanisms Adapted to Large Inclination Angles: Current seat collision protection solutions mostly rely on seat rail buffer structures, such as the rail energy absorption mechanism in patent publication number CN118306283A. This type of mechanism absorbs collision energy through rail deformation, but it has significant technical limitations: First, the energy absorption direction is singular, only absorbing energy along the horizontal rail direction, failing to adapt to the energy transmission path of collisions in large incline seating positions; second, the energy absorption response is delayed, requiring triggering by the vehicle's ACU system, making instantaneous adaptive response impossible; third, there is a phase difference between the energy absorption range and the peak lumbar load period, preventing effective energy dissipation during the peak lumbar load phase, leading to occupant lumbar injury indicators (such as...). The value still exceeds the regulatory safety threshold.

[0004] 3. Seat tilt adjustment mechanism without collision dynamic force relief function: Existing seat tilt adjustment mechanisms, such as the rotatable long sliding rail seat in patent publication number CN223030819U, only focus on expanding the application scenarios of the seat and do not involve collision force management and force relief protection mechanisms under collision conditions.

[0005] 4. Ergonomic support structure with no collision safety redundancy: Existing ergonomic optimization structures such as lumbar support adjustment and seat depth adjustment mostly use rigid locking mechanisms such as cross linkages, which can only optimize the fit of the seat's static support. Under collision conditions, rigid locking mechanisms are prone to structural collapse, which can exacerbate the sudden bending of the occupant's lumbar spine and further increase the risk of lumbar spine injury.

[0006] The fundamental reason for the aforementioned defects in existing technologies lies in the fact that traditional seat safety designs are based on the fundamental assumption of rigid coupling between the occupant and the seat. However, a large recline angle seating posture completely breaks the applicability of this assumption, necessitating the introduction of a controllable dynamic decoupling and energy dissipation mechanism into the seat frame. Existing technologies either fail to achieve dynamic decoupling due to excessive structural rigidity or suffer from misalignment between the energy absorption direction and the energy conduction path, thus failing to fundamentally solve the problem of lumbar spine protection under large recline angle seat collision conditions. Summary of the Invention

[0007] The technical problem solved by this invention is to provide a friction relief system suitable for the safety protection of car seat occupants, so as to solve the problem that traditional seat safety designs in the prior art lack a collision energy directional dissipation mechanism and a seat posture adaptive adjustment scheme.

[0008] The basic solution provided by this invention is a friction relief system suitable for the safety protection of car seat occupants, including a backrest frame, a seat cushion frame bracket, a seat cushion frame side plate, a pin, an adjustment mechanism, and a friction disc system. The backrest frame and the seat cushion frame side plate are connected by the seat cushion frame bracket and the pin, and the adjustment mechanism is located on the pin. The friction disc system includes an adjuster and a friction relief assembly. The adjuster is located between the seat cushion frame support and the backrest frame, and the pivot of the adjuster is connected to the pin. The friction relief assembly is embedded between the seat cushion frame support and the adjuster. The friction relief assembly includes a friction disc drive plate, a friction disc driven plate, a friction disc drive plate, a friction disc driven plate, and a friction disc bolt assembly, wherein: A steel plate is welded to one end of the friction disc drive plate and the angle adjuster to serve as the mounting base. A through arc-shaped positioning groove and pin hole are opened on the outer edge of the mounting base. The mounting base is welded and fixed to the outer side of the angle adjuster. The outer edge of the friction disc drive disc has an arc-shaped hole with the same curvature as the arc-shaped positioning groove and a pin hole, and a through hole is opened in the center; the friction disc drive disc and the friction disc drive disc mounting plate are riveted and fixed by mounting pins passing through the pin holes. The friction disc driven disc mounting plate is welded to the seat cushion frame bracket; bolt connection holes and pin holes are made on the friction disc driven disc mounting plate; Bolt connection holes and pin holes are provided on the friction disc driven disc, and the mounting pin is riveted and fixed to the friction disc driven disc mounting plate by passing through the pin hole; The contact surfaces of the friction disc drive disc and the friction disc driven disc are provided with fitting limiting bosses; The friction disc bolt assembly is fixed by passing through the arc-shaped positioning groove of the friction disc drive plate, the arc-shaped hole of the friction disc drive plate, the bolt connection hole of the friction disc driven plate, and the bolt connection hole of the friction disc driven plate; the friction disc bolt assembly is pre-tightened by a preset pre-tightening force control rule.

[0009] Furthermore, the friction disc bolt assembly is preloaded according to a preset preload control rule, specifically as follows: Use 4 Bolts with a strength grade of 12.9, along with matching disc spring washers and nylon anti-loosening nuts, are used as the configuration for the friction disc bolt assembly; Establish the formula for converting bolt torque to preload, the expression is:

[0010] Indicates the target tightening torque of the bolt. This is the bolt torque coefficient. The nominal diameter of the bolt; This refers to the preload force of a single bolt. A formula for calculating the static friction torque threshold of the friction pair between the driving and driven discs of the friction disc is established, and the expression is:

[0011] in, This represents the threshold value for the static friction torque of the friction pair. Let be the static friction coefficient of the friction pair. The number of bolts in the bolt group; This refers to the preload of a single bolt. The effective radius of the friction pair; A diagonal gradient torque fastening process is adopted, which applies a gradient torque sequence including initial tightening, secondary balancing, and final tightening.

[0012] Furthermore, the application of the gradient torque sequence, including initial tightening, secondary balancing, and final tightening, specifically includes: For initial tightening, tighten the friction disc bolts diagonally, with a tightening torque of 8 ohms for each bolt. ; During the second balancing process, tighten the friction disc bolts diagonally, with a tightening torque of 12 for each bolt. ; When setting the final tightening torque, follow the target torque. Complete the final tightening in a diagonal sequence.

[0013] Furthermore, a steel plate is welded to one end of the friction disc drive plate and the angle adjuster to serve as the mounting base. A through arc-shaped positioning groove and pin hole are formed on the outer edge of the mounting base. The mounting base is welded and fixed to the outer side of the angle adjuster as follows: A 4mm thick Q235B steel plate is welded to one end of the friction disc drive plate mounting plate that connects to the angle adjuster. Four arc-shaped positioning grooves and pin holes are formed on the outer edge of the mounting base using laser cutting technology; the center of the arc-shaped positioning groove is concentric with the rotating shaft of the angle adjuster; and the surface of the groove wall is nitrided. Simultaneously, an arc-shaped groove with the same curvature as the arc-shaped positioning groove is machined on the friction disc drive disc mounting plate; The mounting base of the friction disc drive disc mounting plate is laser-welded to the external planetary gear shaft of the angle adjuster, with a weld penetration depth of [missing information]. Thick welded torque transmission capability .

[0014] Furthermore, the friction disk drive disk adopts... Made of alloy steel, with a hardness of HRC50-55 after overall quenching treatment; The outer edge of the friction disc drive disc has four arc-shaped holes with the same curvature as the arc-shaped positioning groove, and four... The pin hole is opened in the center. spline hole.

[0015] Furthermore, the driven disc of the friction disc adopts a copper-based powder metallurgy lining, with a friction coefficient of... ; Four friction discs are opened on the outer edge of the driven disc. Bolt connection holes and 4 The pin hole; it is fixed to the friction disc driven disc mounting plate by riveting with the mounting pin.

[0016] Furthermore, the connection end between the angle adjuster and the backrest frame has a built-in crush tube secondary energy absorption unit, and the energy absorbed by the crush tube secondary energy absorption unit is 1200-1500J.

[0017] The principle and beneficial effects of this invention are as follows: Based on the integrated mechanical principle of rigidity retention, frictional sliding force dissipation, and adaptive attitude control, a frictional force dissipation assembly is embedded at the hinge point between the seat back and the seat cushion to achieve automatic switching between daily use and collision conditions. Specifically, this includes: 1. Dual-state mechanical mechanism: First, during daily riding and posture adjustment, the friction disc drive disc and the friction disc driven disc maintain static friction lock under the pre-tightening force of the bolt group, providing sufficient support torque to ensure the stability of the seat structure and prevent posture deviation, meeting the strength requirements of normal use and regulatory requirements.

[0018] When the overturning torque generated by a frontal collision exceeds the preset static friction torque threshold, the friction pair automatically breaks through the static friction and enters the dynamic friction sliding state. The seat frame support rotates controllably relative to the angle adjuster along the arc-shaped positioning groove to continuously dissipate the collision kinetic energy through friction.

[0019] 2. Directional energy dissipation principle: Collision energy is converted into heat energy through the friction pair interface and released directionally along the arc trajectory, without transmitting concentrated load to the occupant's lumbar spine; the sliding angle is precisely limited by the central angle of the arc positioning groove, so that the backrest rotates forward to a biomechanically safe angle, reducing the degree of lumbar spine bending.

[0020] 3. Torque and stroke controllable principle: based on bolt torque The preload formula and static friction torque threshold formula enable precise calibration of the unloading start point; combined with the disc-shaped spring pad to compensate for thermal deformation and wear, the friction coefficient and torque are kept stable during the sliding process, so as to achieve controllable start threshold, controllable sliding stroke and controllable energy absorption rate.

[0021] 4. Graded self-locking protection principle: After frictional sliding reaches the maximum stroke, it automatically stops. The angle adjuster and deceleration mechanism maintain self-locking to prevent the backrest from rebounding and causing secondary injury, forming a safety closed loop of "unloading force first and then locking".

[0022] The beneficial effects are: 1. Significantly reduces the risk of lumbar spine overload injury for occupants: Breaking through the traditional rigid locking structure, it replaces rigid transmission with controllable sliding during a collision, avoiding the direct impact energy on the lumbar spine; it greatly reduces the lumbar spine compression moment and load under a large tilting sitting posture, solving the problem of irreversible damage to the lumbar spine caused by rigid angle adjusters.

[0023] 2. Achieve instantaneous collision energy absorption adaptable to large tilt angle postures: No ACU triggering required, no electronic control delay, millisecond-level response from a purely mechanical structure, energy absorption path matched with the energy conduction direction of large tilt angle sitting posture, completing core energy dissipation during peak lumbar load periods, thus... When the damage indicators drop to within the safe threshold.

[0024] 3. Imparting dynamic impact relief function to the tilt adjustment mechanism: Without changing the seat adjustment function, the friction relief assembly is integrated on the outside of the tilt adjuster, so that the adjustment mechanism has both attitude adjustment and collision protection capabilities, solving the defect of traditional tilt adjusters that can only adjust and have no impact relief protection.

[0025] 4. Enhance the collision safety redundancy of the ergonomic support structure: Replace the collapse deformation of the rigid locking mechanism with stable frictional sliding, avoid sudden failure of the support structure and aggravate lumbar bending, and significantly improve the structural redundancy and occupant protection capability under collision conditions while ensuring static fit and comfort.

[0026] 5. Reliable structure, low cost, and strong adaptability: The whole structure is a pure mechanical integrated structure with no complex electronic components, which makes it highly reliable and easy to assemble; the unloading threshold and sliding stroke can be flexibly calibrated through formulas, making it suitable for different vehicle models and different seat platforms, with strong versatility. Attached Figure Description

[0027] Figure 1 Axonometric view of the seat frame in an embodiment of the present invention Figure 1 ; Figure 2 Axonometric view of the seat frame in an embodiment of the present invention Figure 2 ; Figure 3 This is a schematic diagram of the installation of the friction relief assembly and the backrest frame in an embodiment of the present invention; Figure 4 This is an isometric view of the friction disk drive disk mounting plate in an embodiment of the present invention; Figure 5 This is an isometric view of the friction disc driven disc mounting plate in an embodiment of the present invention; Figure 6 This is an isometric view of the friction disk drive disk in an embodiment of the present invention; Figure 7 This is an isometric view of the friction disk driven disk in an embodiment of the present invention; Figure 8 This is an exploded view of the friction unloading assembly in an embodiment of the present invention. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Backrest frame; 2. Seat cushion frame bracket; 3. Seat cushion frame side plate; 4. Adjustment mechanism; 5. Pin; 6. Angle adjuster; 7. Friction disc drive plate mounting plate; 7. Mounting base; 701. Arc-shaped positioning groove; 702. Friction disc drive plate; 8. Friction disc driven plate; 9. Friction disc driven plate mounting plate; 10. Friction disc bolt group; 11. Mounting pin; 12. Bolt connection hole; 13. Pin hole; 14. Limiting boss; 15.

[0029] Example 1: Example 1 is basically as shown in the attached document. Figure 1 As shown: A friction-relief system for occupant safety protection in automobile seats includes a backrest frame 1, a seat cushion frame support 2, a seat cushion frame side plate 3, an adjustment mechanism 4, and a friction disc system. The backrest frame 1 and the seat cushion frame side plate 3 are connected by the seat cushion frame support 2 and a pin 5. Figure 1 and Figure 2 The seat frame structure of this application is shown; meanwhile, as Figure 2 As shown, an adjustment mechanism 4 is arranged on the inner side of the backrest frame 1, such as... Figure 3As shown, the adjustment mechanism 4 in this application includes an adjustment motor and a reduction mechanism. The reduction mechanism can be a worm gear, used in conjunction with the adjustment motor. The function of the adjustment mechanism 4 is to maintain the backrest position by adjusting the motor through the self-locking of the worm gear.

[0030] The friction disc system includes an adjuster 6 and a friction relief assembly. The adjuster 6 is located between the seat cushion frame support 2 and the backrest frame 1. The rotating shaft of the adjuster 6 is connected to the pin 5. Specifically, the adjuster 6 in this embodiment is a planetary gear type adjuster 6, which has a planetary gear set, a rotating shaft, a housing, and a locking and self-locking structure. The structure of the planetary gear type adjuster 6 is an existing device, and this embodiment will not describe the structure in detail.

[0031] The friction-relieving assembly is embedded between the seat cushion frame bracket 2 and the seat adjuster 6, specifically, as follows: Figure 8 As shown, the friction relief assembly includes a friction disc drive plate 7, a friction disc driven plate 10, a friction disc drive plate 8, a friction disc driven plate 9, and a friction disc bolt group 11, wherein: A steel plate is welded to one end of the friction disc drive plate 7 and the angle adjuster 6 to serve as a mounting base 701. A through arc-shaped positioning groove 702 and a pin hole 14 are formed on the outer edge of the mounting base 701. The mounting base 701 is welded and fixed to the outer side of the angle adjuster 6. In this application, a 4mm thick Q235B steel plate is welded to one end of the friction disc drive plate 7 and the angle adjuster 6 to serve as the mounting base 701. The shape and position of the mounting base 701 are as follows... Figure 3 As shown, four arc-shaped positioning grooves 702 and four pin holes 14 are formed on the outer edge of the mounting base 701 using laser cutting technology; the center of the arc of the positioning groove 702 is concentric with the rotating shaft of the angle adjuster 6; the width of a single arc-shaped positioning groove 702 is set to 6.2mm, and the central angle corresponding to the arc length is... The radius of curvature R = 45 mm, and the surface of the arc-shaped positioning groove 702 is nitrided to increase its hardness. To improve wear resistance; like Figure 4 The schematic diagram of the friction disc drive plate 7 shown is shown. The friction disc drive plate 7 uses the same base material and processing technology as the seat frame bracket 2, and simultaneously processes an arc groove and pin hole 14 with the same curvature as the arc positioning groove 702 for positioning connection with the friction disc drive plate 8.

[0032] After the mounting base 701 of the friction disc drive plate 7 is welded, the mounting base 701 of the friction disc drive plate 7 is then laser-welded to the external planetary gear shaft of the angle adjuster 6, with a weld penetration depth of [missing information]. Thick welded torque transmission capability .

[0033] The outer edge of the friction disc drive plate 8 has an arc-shaped hole with the same curvature as the arc-shaped positioning groove 702 and a pin hole 14, and a through hole is opened in the center; the friction disc drive plate 8 and the friction disc drive plate mounting plate 7 are riveted together by mounting pins 12 passing through the pin holes 14; wherein, the friction disc drive plate 8 adopts Made of alloy steel, with a hardness of HRC50-55 after overall quenching treatment; The outer edge of the friction disc drive disc 8 has four arc-shaped holes with the same curvature as the arc-shaped positioning groove 702, and four... Pin hole 14, center opening spline hole.

[0034] The friction disc driven disc mounting plate 10 is welded to the seat cushion frame bracket 2, such as... Figure 5 As shown, bolt connection holes 13 and pin holes 14 are simultaneously opened on the friction disc driven disc mounting plate 10; bolt connection holes 13 and pin holes 14 are opened on the friction disc driven disc 9, and mounting pins 12 are riveted and fixed to the friction disc driven disc mounting plate 10 through the pin holes 14; specifically, the friction disc driven disc 9 adopts a copper-based powder metallurgy lining with a friction coefficient of... Four friction discs are opened on the outer edge of the driven disc 9. Bolt connection holes 13 and 4 The pin hole 14; is fixed to the friction disc driven disc mounting plate 10 by the mounting pin 12.

[0035] The contact surfaces of the friction disc drive disc 8 and the friction disc driven disc 9 are provided with engaging limiting bosses 15, such as... Figure 6 The friction disk drive disk 8 structure shown is as follows: Figure 7 The friction disc driven disc 9 structure shown has a limiting boss 15 whose shape can be configured according to actual needs, such as in embodiment 6 and... Figure 7 The semi-circular boss shown can also be of other shapes. Its purpose is to ensure that the contact surfaces of the friction disk drive disk 8 and the friction disk driven disk 9 fit together when they come into contact.

[0036] When the friction disc drive disc 8 and the friction disc driven disc 9 are in contact, the friction disc bolt assembly 11 passes through the arc-shaped positioning groove 702 of the friction disc drive disc mounting plate 7, the arc-shaped hole of the friction disc drive disc 8, the bolt connection hole 13 of the friction disc driven disc 9, and the bolt connection hole 13 of the friction disc driven disc mounting plate 10 for fixation, and the preload is controlled by a preset preload control rule; the preset preload control rule is as follows: Use 4 Bolts with a strength grade of 12.9, along with matching disc spring washers and nylon anti-loosening nuts, are used as the configuration for friction disc bolt group 11; Establish the formula for converting bolt torque to preload, the expression is:

[0037] Indicates the target tightening torque of the bolt. This is the bolt torque coefficient, which is 0.2 in this embodiment. The nominal diameter of the bolt; This refers to the preload force of a single bolt. A formula for calculating the static friction torque threshold of the friction pair between the driving disc 8 and the driven disc 9 is established, and the expression is:

[0038] in, This represents the threshold value for the static friction torque of the friction pair. Let be the static friction coefficient of the friction pair. The number of bolts in the bolt group; This refers to the preload of a single bolt. The effective radius of the friction pair; A diagonal gradient torque tightening process is adopted, applying a gradient torque sequence including initial tightening, secondary balancing, and final tightening. During the process, a digital torque wrench is used to tighten the bolts according to the gradient sequence, and the slippage torque is monitored in real time until the target is met; specifically: For initial tightening, tighten the friction disc bolt group 11 diagonally in sequence, with a tightening torque of 8 for each bolt. ; During the second balancing process, tighten the friction disc bolt group 11 diagonally in sequence, with a tightening torque of 12 for each bolt. ; When setting the final tightening torque, follow the target torque. Complete the final tightening in a diagonal sequence.

[0039] Meanwhile, to ensure secure installation, a mounting shim and a connecting nut for the pin 5 are used to fix the friction relief assembly, and a protective plate with an arc-shaped hole of the same curvature as the arc-shaped positioning groove 702 is installed on the outside of the seat frame bracket 2.

[0040] Based on the structural description of the above technical solution, the assembly process is as follows: Friction relief assembly positioning welding: The mounting base 701 of the friction disc drive disc mounting plate 7 is laser-welded to the external planetary gear shaft of the angle adjuster 6, with a weld penetration depth of [missing information]. Thick welded torque transmission capability To meet the torque transmission requirements under collision conditions; Frame pre-assembly: Align the arc-shaped hole of the protective plate on the outside of the seat frame bracket 2 with the arc-shaped hole of the friction relief assembly, insert the bolt of the friction disc bolt group 11, and install the disc spring washer, mounting washer, and connecting nut of pin 5 in sequence. Pre-install the nylon anti-loosening nut of the friction disc bolt group 11 to ensure that the friction surfaces of the friction disc drive disc 8 and the friction disc driven disc 9 are in close contact.

[0041] Torque calibration and final inspection: Use a digital torque wrench to tighten the bolts according to the above-mentioned gradient tightening process. Use a torque wrench to monitor the slippage starting torque of the friction pair in real time until the preset threshold is reached to complete the assembly.

[0042] This embodiment describes in detail the force unloading process control logic under collision conditions based on the above-described technical solution of this application: Phase 1 (0-50ms after collision): The backrest is subjected to the inertial force of the occupants, generating a rollover moment. When the rollover moment exceeds the static friction torque threshold of the friction pair... At this time, the seat frame support 2 undergoes controllable rotational sliding relative to the friction disc assembly (friction disc drive disc 8 and friction disc driven disc 9), the arc-shaped positioning groove 702 slides along the bolt surface, the friction interface continues to do work, converting the collision kinetic energy into heat energy, and realizing the stable dissipation of collision energy; during this stage, the angle adjuster 6 achieves self-locking by adjusting the worm gear structure of the motor and reduction mechanism, with no relative rotation, ensuring that all relative sliding occurs in the friction unloading assembly.

[0043] Second stage (50-80ms): The backrest slides forward due to friction and rotates, reaching a rotation angle of... At that time, the angle between the occupant's torso and the backrest approaches... Reduced lumbar curvature The load on the lumbar spine decreases to within the safe threshold.

[0044] The third stage (80ms after the collision): the frictional slip reaches the maximum stroke of the arc groove, the slip terminates, and the adjusting motor and reduction mechanism of the angle adjuster 6 continue to achieve self-locking through the worm gear structure to maintain the current position of the backrest and prevent the backrest from rebounding and causing secondary injury to the occupant.

[0045] Example 2: The difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, a secondary energy absorption unit with a crushing tube is built into the connection end between the angle adjuster 6 and the backrest frame 1, and the energy absorbed by the secondary energy absorption unit with the crushing tube is 1200-1500J.

[0046] Specifically, the angle adjuster 6 incorporates a secondary energy absorption unit with a built-in crushing tube, constructing a graded and coordinated energy absorption mechanism. This mechanism forms a series energy absorption path with the friction relief assembly. First-stage energy absorption: Under collision conditions, the friction unloading assembly starts first, and the collision energy is dissipated through frictional sliding until the sliding stroke of the arc-shaped positioning groove 702 and the arc-shaped hole is exhausted; Secondary energy absorption: If the friction slip stroke is exhausted but the impact is not completely attenuated, the crush tube is triggered, and additional energy is dissipated through structural crush deformation, forming a smooth force-displacement curve, which further reduces the occupant's lumbar spine load.

[0047] Therefore, the third stage under the collision condition in Embodiment 1 also includes: The third stage (80ms after the collision): the frictional slip reaches the maximum stroke of the arc groove, the slip terminates, the adjustment motor and reduction mechanism of the angle adjuster 6 continue to achieve self-locking through the worm gear structure, maintain the current position of the backrest, and prevent the backrest from rebounding and causing secondary injury to the occupant; if the impact load has not completely decayed, the crush tube of the secondary energy absorption unit is triggered to complete the dissipation of the remaining impact energy.

[0048] Therefore, based on the above description, this solution addresses the collision safety concerns of seats with large tilt angles through precise mechanical design of the friction interface. Compared to traditional technologies, it offers the following core advantages: 1. Dynamically adjustable friction preload: The slip threshold can be precisely set via the torque gradient control of the M10 bolts (e.g., 2500 for sports seats). The elderly seat is set at 1800. Meanwhile, this solution achieves purely mechanical adaptive adjustment, eliminating the risk of sensor delay.

[0049] 2. Multi-stage energy absorption synergy mechanism: The friction mechanism can form a series energy absorption path with the built-in crush tube of the angle adjuster 6. When the friction stroke is exhausted and the impact is not completely absorbed, the crush tube is activated as a secondary energy absorption unit, providing an additional 1200-1500J of energy dissipation, forming a smoother force-displacement curve.

[0050] 3. Ergonomic design integration: The central angle of the arc-shaped groove matches the lumbar spine safety rotation angle ( This ensures that the end point of the forward rotation of the backrest is in the biomechanical safety zone; at the same time, the frictional heat distribution is far away from the occupant contact area to avoid the risk of burns.

[0051] 4. Cost control advantages: The friction disc adopts powder metallurgy, which reduces the number of parts compared to the electric unloading slider-boss structure. Reduce assembly time .

[0052] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A friction-relieving system suitable for occupant safety protection in automobile seats, characterized in that: It includes a backrest frame, a seat cushion frame bracket, a seat cushion frame side plate, a pin, an adjustment mechanism, and a friction disc system. The backrest frame and the seat cushion frame side plate are connected by the seat cushion frame bracket and the pin. The adjustment mechanism is located on the pin. The friction disc system includes an adjuster and a friction relief assembly. The adjuster is located between the seat cushion frame support and the backrest frame, and the pivot of the adjuster is connected to the pin. The friction relief assembly is embedded between the seat cushion frame support and the adjuster. The friction relief assembly includes a friction disc drive plate, a friction disc driven plate, a friction disc drive plate, a friction disc driven plate, and a friction disc bolt assembly, wherein: A steel plate is welded to one end of the friction disc drive plate and the angle adjuster to serve as the mounting base. A through arc-shaped positioning groove and pin hole are opened on the outer edge of the mounting base. The mounting base is welded and fixed to the outer side of the angle adjuster. The outer edge of the friction disc drive disc has an arc-shaped hole with the same curvature as the arc-shaped positioning groove and a pin hole, and a through hole is opened in the center; the friction disc drive disc and the friction disc drive disc mounting plate are riveted and fixed by mounting pins passing through the pin holes. The friction disc driven disc mounting plate is welded to the seat cushion frame bracket; bolt connection holes and pin holes are made on the friction disc driven disc mounting plate; Bolt connection holes and pin holes are provided on the friction disc driven disc, and the mounting pin is riveted and fixed to the friction disc driven disc mounting plate by passing through the pin hole; The contact surfaces of the friction disc drive disc and the friction disc driven disc are provided with fitting limiting bosses; The friction disc bolt assembly is fixed by passing through the arc-shaped positioning groove of the friction disc drive plate, the arc-shaped hole of the friction disc drive plate, the bolt connection hole of the friction disc driven plate, and the bolt connection hole of the friction disc driven plate; the friction disc bolt assembly is pre-tightened by a preset pre-tightening force control rule.

2. The friction relief system for occupant safety protection in automobile seats according to claim 1, characterized in that: The friction disc bolt assembly is preloaded according to a preset preload control rule, specifically as follows: Use 4 Bolts with a strength grade of 12.9, along with matching disc spring washers and nylon anti-loosening nuts, are used as the configuration for the friction disc bolt assembly; Establish the formula for converting bolt torque to preload, the expression is: Indicates the target tightening torque of the bolt. This is the bolt torque coefficient. The nominal diameter of the bolt; This refers to the preload force of a single bolt. A formula for calculating the static friction torque threshold of the friction pair between the driving and driven discs of the friction disc is established, and the expression is: in, This represents the threshold value for the static friction torque of the friction pair. Let be the static friction coefficient of the friction pair. The number of bolts in the bolt group; This refers to the preload of a single bolt. The effective radius of the friction pair; A diagonal gradient torque fastening process is adopted, which applies a gradient torque sequence including initial tightening, secondary balancing, and final tightening.

3. A friction relief system for occupant safety protection in automobile seats according to claim 2, characterized in that: The applied gradient torque sequence, including initial tightening, secondary balancing, and final tightening, is specifically as follows: For initial tightening, tighten the friction disc bolts diagonally, with a tightening torque of 8 ohms for each bolt. ; During the second balancing process, tighten the friction disc bolts diagonally, with a tightening torque of 12 for each bolt. ; When setting the final tightening torque, follow the target torque. Complete the final tightening in a diagonal sequence.

4. A friction relief system for occupant safety protection in automobile seats according to claim 1, characterized in that: The friction disc drive plate is connected to the angle adjuster by welding a steel plate to one end, which serves as the mounting base. A through arc-shaped positioning groove and pin hole are formed on the outer edge of the mounting base. The mounting base is welded and fixed to the outer side of the angle adjuster as follows: A 4mm thick Q235B steel plate is welded to one end of the friction disc drive plate mounting plate that connects to the angle adjuster. Four arc-shaped positioning grooves and pin holes are formed on the outer edge of the mounting base using laser cutting technology; The center of the arc-shaped positioning groove is concentric with the rotating shaft of the angle adjuster; and the surface of the groove wall is nitrided. Simultaneously, an arc-shaped groove with the same curvature as the arc-shaped positioning groove is machined on the friction disc drive disc mounting plate; The mounting base of the friction disc drive disc mounting plate is laser-welded to the external planetary gear shaft of the angle adjuster, with a weld penetration depth of [missing information]. Thick welded torque transmission capability .

5. A friction relief system for occupant safety protection in automobile seats according to claim 1, characterized in that: The friction disk drive disk adopts Made of alloy steel, with a hardness of HRC50-55 after overall quenching treatment; The outer edge of the friction disc drive disc has four arc-shaped holes with the same curvature as the arc-shaped positioning groove, and four... The pin hole, center opening spline hole.

6. A friction relief system for occupant safety protection in automobile seats according to claim 1, characterized in that: The driven disc of the friction disk uses a copper-based powder metallurgy lining, and the coefficient of friction is... ; Four friction discs are opened on the outer edge of the driven disc. Bolt connection holes and 4 The pin hole; it is fixed to the friction disc driven disc mounting plate by riveting with the mounting pin.

7. A friction relief system for occupant safety protection in automobile seats according to claim 1, characterized in that: The connection end between the angle adjuster and the backrest frame has a built-in crush tube secondary energy absorption unit, which absorbs 1200-1500J of energy.

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