Energy absorption device with function of automatically matching load of person and chair

Abstract

The utility model discloses an energy-absorbing device with a function of automatically matching loads of a person and a chair. The energy-absorbing device comprises an energy-absorbing module and a gear-shifting module, the energy absorption module is provided with an external connection point and gears corresponding to different energy absorption effects; the gear shifting module comprises a barrel fixedly connected to the chair legs, a first spring, a force transmission mechanism, a transmission shaft, a transmission mechanism, a gear pin and a locking mechanism, wherein the first spring and the force transmission mechanism are located in the barrel, the transmission shaft penetrates through the barrel and the first spring and can ascend and descend along with the chair basin, the transmission mechanism is arranged on the outer connection point, the gear pin is used for changing the position to be matched with different gears, and the locking mechanism is used for controlling the position of the locking and unlocking transmission shaft. The force transmission mechanism is used for transmitting loads borne by the transmission shaft to the first spring, the input end and the output end of the transmission mechanism are connected with the lower end of the transmission shaft and the gear pin correspondingly, and the transmission shaft can drive the gear pin to change the position through the transmission mechanism. The device can be automatically adjusted to a proper energy absorption effect according to the weight of a passenger, and optimal protection can be provided for passengers in different percentile positions.

Description

Technical Field

[0001] This utility model relates to a helicopter crash-resistant seat, specifically to an energy-absorbing device with an automatic human-seat load matching function. Background Technology

[0002] The impact of a helicopter crashing due to a serious malfunction or being struck during flight poses a significant threat to the lives of its occupants. To mitigate the impact of a helicopter crash, crash-resistant seats are currently used to absorb the energy of the impact. These seats limit the load transmitted from the fuselage to the occupants during a crash, thereby reducing the casualty rate in crash-survivable accidents.

[0003] Currently, crash-resistant seats use energy absorbers with fixed load-displacement characteristics to decelerate occupants. To maximize effectiveness within the occupant's weight range, this constant load is designed based on the 50th percentile occupant weight. Therefore, it only provides optimal protection for occupants with the 50th percentile weight, allowing them to move downwards with a deceleration not exceeding 14.5G. However, for heavier occupants, the energy-absorbing load is too small, posing a potential risk of the seat impacting the floor. Conversely, lighter occupants cannot fully utilize the effective impact travel and may experience a higher deceleration impact than anticipated. Utility Model Content

[0004] The purpose of this invention is to provide an energy-absorbing device with automatic human-chair load matching function. This device can automatically adjust to a suitable energy-absorbing effect according to the weight of the occupant, and can provide the best protection for occupants at different percentages, minimizing the damage caused to occupants by impact when subjected to large overloads.

[0005] The technical solution adopted in this utility model is:

[0006] An energy-absorbing device with automatic load matching function for passengers and seats is installed on a helicopter passenger seat. It includes an energy-absorbing module and a shifting module. The energy-absorbing module is used to absorb energy during a crash. It is located on the seat leg and has external connection points and different energy-absorbing positions. The shifting module is used to automatically match the shifting position according to the passenger and seat load and can operate to lock and unlock the shifting position. It includes a cylinder fixed to the seat leg, a spring and a force transmission mechanism located inside the cylinder, a drive shaft passing through the cylinder and spring and capable of rising and falling with the seat, a transmission mechanism located on the external connection point, a shifting pin for changing position to match different shifting positions, and a locking mechanism for operating to lock and unlock the drive shaft. The force transmission mechanism transmits the load on the drive shaft to the spring; the greater the load, the greater the downward movement of the drive shaft and the compression of the spring. The input and output ends of the transmission mechanism are connected to the lower end of the drive shaft and the shifting pin, respectively. The drive shaft can drive the shifting pin to change position through the transmission mechanism; the greater the downward movement of the drive shaft, the stronger the energy absorption effect of the shifting position matched by the shifting pin.

[0007] Preferably, the energy absorption module includes a flip plate for absorbing energy by utilizing material deformation, an outer block, a pressure plate one, and a pressure plate two located above the flip plate. The upper end of the flip plate is bent into an inverted U-shape to form a bent portion and then extends laterally to form a horizontal portion. The outer block is connected to the horizontal portion, and the outer connection point is located on the outer block. Pressure plate one and pressure plate two are located on the upper side of the horizontal portion and are stacked between the outer block and the bent portion. Pressure plate two is closer to the bent portion than pressure plate one. The energy absorption module has three levels. In the first level, only the outer block presses down on the flip plate. In the second level, the outer block and pressure plate two press down on the flip plate simultaneously. In the third level, the outer block, pressure plate one, and pressure plate two press down on the flip plate simultaneously.

[0008] Preferably, the shift pin includes a short pin and a long pin arranged laterally and vertically respectively. When the drive shaft moves downward, it can drive the short pin and the long pin to move simultaneously towards the energy absorption module. The outer block, pressure plate one, and pressure plate two are all provided with through holes for the short pin and the long pin to pass through. The through hole located at the bottom of pressure plate one is connected to the opening groove to form an open structure at the bottom, and the other through holes are closed holes. In the first shift position, the short pin fails to enter the through hole located at the top of pressure plate one, and the long pin fails to enter the through hole located at the bottom of pressure plate two. In the second shift position, the short pin fails to enter the through hole located at the top of pressure plate one, and the long pin enters the through hole located at the bottom of pressure plate two. In the third shift position, the short pin enters the through hole located at the top of pressure plate one, and the long pin enters the through hole located at the bottom of pressure plate two.

[0009] Preferably, the transmission mechanism includes a connecting rod and a guide and a sliding member that form a sliding pair. The two ends of the connecting rod are respectively hinged to the lower end of the transmission shaft and one end of the sliding member. The other end of the sliding member is fixedly connected to a stop pin. The guide is fixedly connected to an external contact point. When the transmission shaft moves downward, the connecting rod drives the sliding member and the stop pin to move towards the energy absorption module.

[0010] Preferably, the guide member slides with the chair basin via a sliding seat, and the sliding direction is the lifting direction of the chair basin. The sliding seat is installed on the chair basin.

[0011] Preferably, the force transmission mechanism includes a sleeve that is threaded onto the drive shaft, a second spring that is sleeved on the sleeve, and a locking ring that is non-rotatably slidably fitted on the upper end of the cylinder. The lower end of the sleeve abuts against the first spring, and a spline is opened on the upper outer wall. The locking ring has a spline groove inside that can mate with the spline. The second spring always applies an upward force away from the sleeve to the locking ring. The upper end of the drive shaft passes through the locking ring. Initially, the locking ring is separated from the sleeve.

[0012] Preferably, the upper part of the cylinder is provided with two-stage stepped holes. The upper stepped hole is provided with a stop block, and the lower stepped hole is provided with a bearing. The lower end of the sleeve first passes through the stop block and then through the bearing to abut against spring one. The two ends of spring two abut against the locking ring and the stop block respectively.

[0013] Preferably, the ends of the spline and spline groove are provided with guide structures to facilitate mutual insertion.

[0014] Preferably, the locking mechanism includes a mounting base fixed to the chair leg, a pull rod slidably fitted on the mounting base, a spring three sleeved on the pull rod, a pressure block connected to the upper end of the pull rod, a cable connected to the lower end of the pull rod, and an operating handle connected to the cable. The pressure block is directly above the locking ring. The spring three always applies an upward force away from the locking ring to the pressure block. The upper end of the drive shaft passes through the pressure block. Initially, the pressure block is separated from the locking ring. The operating handle can drive the pull rod and pressure block to move downward against the force of the spring three through the cable, thereby driving the locking ring to move downward against the force of the spring two and engage with the sleeve shaft spline. The operating handle has a locked position and an unlocked position. In the locked position, the cable can only be pulled downward in one direction. In the unlocked position, the cable can move in both directions.

[0015] Preferably, the upper end of the drive shaft is connected to the chair basin via an adapter. The adapter includes an integral or fixed mounting block and a sleeve. The mounting block is mounted on the chair basin. The sleeve is laterally and slidably fitted with a support rod. The support rod is integrally or fixedly fitted with a slider. The slider is slidably fitted with the chair leg and the sliding direction is the lifting direction of the chair basin. The drive shaft is fixedly connected to the mounting block or the sleeve.

[0016] The beneficial effects of this utility model are:

[0017] This device automatically adjusts to a suitable energy absorption effect based on the occupant's weight, providing optimal protection for occupants at different weight percentages and minimizing injuries caused by impacts during significant overloads. Before use, the drive shaft is unlocked via the locking mechanism. The occupant then sits on the seat, causing the seat and drive shaft to move downwards. During this downward movement, the force transmission mechanism transfers the load on the drive shaft to spring 1. The greater the load on the occupant and seat, the greater the downward movement of the drive shaft and the compression of spring 1. Simultaneously, the drive shaft, through the transmission mechanism, changes the position of the shift pin. The greater the downward movement of the drive shaft, the stronger the energy absorption effect of the shift pin's corresponding shift position. Therefore, the greater the load on the occupant and seat, the stronger the energy absorption effect of the matched shift position. After shift adjustment, the drive shaft position is locked via the locking mechanism, thus fixing the shift position and preventing further adjustment. Even if the occupant leaves, the adjusted shift position remains unchanged. If the occupant is changed or their weight changes, the shift position can be unlocked via the locking mechanism, spring 1 will reset the device, and then the shift position can be adjusted. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is an installation diagram of the energy-absorbing device with automatic human-chair load matching function in this utility model. The cable and control handle are not shown in the diagram.

[0020] Figure 2 This is a schematic diagram of the energy-absorbing device with automatic human-chair load matching function in this utility model. The control handle is not shown in the figure.

[0021] Figure 3 This is a schematic diagram of the cylinder, drive shaft, spring 1, and force transmission mechanism in the shifting module of this utility model.

[0022] Figure 4 This is an assembly diagram of the sleeve shaft and locking ring in the force transmission mechanism of this utility model.

[0023] Figure 5 This is a schematic diagram of the locking mechanism in the shifting module of this utility model. The operating handle is not shown in the figure.

[0024] Figure 6 This is a schematic diagram of the transmission mechanism in the shifting module of this utility model.

[0025] Figure 7 This is a schematic diagram of the sliding component and the gear pin in the transmission mechanism of this utility model.

[0026] Figure 8 This is a disassembly diagram of the energy absorption module in this utility model.

[0027] In the diagram: 1-chair basin; 2-chair leg; 3-mounting block; 4-sleeve; 5-slider; 6-support rod; 7-locking mechanism; 8-cylinder; 9-mounting seat; 10-drive shaft; 11-sliding seat; 12-energy absorption module; 13-guide component; 14-pressure block; 15-spring three; 16-pull rod; 17-pull cable; 18-connecting rod; 19-slider component; 20-locking ring; 21-spring two; 22-sleeve shaft; 23-stop block; 24-bearing; 25-spring one; 26-short pin; 27-long pin; 28-external connecting block; 29-external connection point; 30-through hole; 31-lateral part; 32-flipping plate; 33-bending part; 34-pressure plate two; 35-pressure plate one. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "spring one," "spring two," "spring three," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0034] This embodiment discloses an energy-absorbing device with automatic human-seat load matching function, installed on a helicopter crew seat, including an energy-absorbing module 12 and a shifting module; such as Figure 1 and Figure 2As shown, the energy-absorbing module 12 is used to absorb energy during an impact. It is located on the chair leg 2 and has an external contact point 29 and gears corresponding to different energy-absorbing effects. The gear shifting module is used to automatically match the gear according to the load on the chair and can operate the locking and unlocking of the gear. It includes a cylinder 8, a spring 25, a force transmission mechanism, a drive shaft 10, a transmission mechanism, a gear pin, and a locking mechanism 7. The cylinder 8 is fixed to the chair leg 2. The spring 25 and the force transmission mechanism are located inside the cylinder 8. The drive shaft 10 passes through the cylinder 8 and the spring 25 and can rise and fall with the chair seat 1. The mechanism is used to transmit the load on the drive shaft 10 to the spring 25. The greater the load, the greater the downward movement of the drive shaft 10 and the compression of the spring 25. The transmission mechanism is located on the external contact point 29. The input end and output end of the transmission mechanism are connected to the lower end of the drive shaft 10 and the gear pin, respectively. The drive shaft 10 can drive the gear pin to change position through the transmission mechanism. The gear pin is used to change position to match different gears. The greater the downward movement of the drive shaft 10, the stronger the energy absorption effect of the gear matched by the gear pin. The locking mechanism 7 is used to operate to lock and unlock the position of the drive shaft.

[0035] This device can automatically adjust to a suitable energy absorption effect according to the weight of the occupant, providing optimal protection for occupants at different percentages and minimizing injuries caused by impact when subjected to large overloads. Before use, the position of the drive shaft 10 is unlocked by operating the locking mechanism 7. Then, the occupant sits on the seat basin 1, causing the seat basin 1 and drive shaft 10 to move downwards. During the downward movement of the drive shaft 10, on the one hand, the force transmission mechanism transmits the load on the drive shaft 10 to the spring 25. The greater the load on the person and the chair, the greater the downward movement of the drive shaft 10 and the compression of the spring 25. On the other hand, the transmission... The shaft 10 drives the gear pin to change position through the transmission mechanism. The greater the downward movement of the transmission shaft 10, the stronger the energy absorption effect of the gear matched by the gear pin. Therefore, the greater the load on the chair, the stronger the energy absorption effect of the matched gear. After the gear is adjusted, the position of the transmission shaft 10 is locked by the locking mechanism 7. In this way, the gear is fixed and cannot be adjusted. Even if the occupant leaves, the adjusted gear can be maintained. Afterwards, if the occupant is changed or the occupant's weight changes and adjustment is desired, the position of the transmission shaft 10 is first unlocked by the locking mechanism 7. The spring 25 drives the device to reset, and then the gear can be adjusted.

[0036] The seat basin 1 and the seat legs 2 are conventional structures. The seat basin 1 is used for sitting, and the seat legs 2 are used to provide support and guidance in the event of a crash.

[0037] Among them, spring 25 not only provides support, but also adapts to the downward movement of the drive shaft 10 of different percentiles of the passengers' weight control, and can also drive the device to reset.

[0038] like Figure 1 As shown, in this embodiment, the energy absorption device is located on the left and right sides of the back of the chair basin 1. Using two sets of devices on the left and right sides can ensure smooth movement and guarantee the energy absorption effect.

[0039] like Figure 1 As shown, in this embodiment, the upper end of the drive shaft 10 is connected to the chair basin 1 via an adapter. The adapter includes an integral or fixed mounting block 3 and a sleeve 4. The mounting block 3 is mounted on the chair basin 1 (by screws). The sleeve 4 is laterally and slidably fitted with a support rod 6. A slider 5 is integrally or fixedly connected to the support rod 6. The slider 5 is slidably fitted with the chair leg 2 and the sliding direction is the lifting direction of the chair basin 1. The drive shaft 10 is fixedly connected to the mounting block 3 or the sleeve 4. By integrating the slider 5 of the chair basin 1 and the drive shaft 10 together through the adapter, the position accuracy can be guaranteed, and the lateral installation position of the device can be easily adjusted.

[0040] like Figures 1 to 3 As shown, in this embodiment, the force transmission mechanism includes a sleeve 22 threadedly fitted onto the drive shaft 10, a second spring 21 fitted onto the sleeve 22, and a locking ring 20 that slides non-rotatingly within the upper end of the cylinder 8. The lower end of the sleeve 22 abuts against the first spring 25, and a spline is provided on the upper outer wall. The locking ring 20 has a spline groove inside that can engage with the spline. The second spring 21 always applies an upward force away from the sleeve 22 to the locking ring 20. The upper end of the drive shaft 10 passes through the locking ring 20. Initially, the locking ring 20 is separated from the sleeve 22. When the occupant sits on the seat basin 1, the drive shaft 10 moves downward, causing the sleeve shaft 22 to press down on the spring 25. When the sleeve shaft 22 is subjected to an upward force, it rotates around the drive shaft 10 under the action of the thread and moves upward relative to the drive shaft 10 until the forces between the drive shaft 10, the sleeve shaft 22 and the spring 25 reach equilibrium and the three stop moving. After that, if the force of the spring 21 is overcome and the locking ring 20 is pressed down, so that the locking ring 20 is splined with the sleeve shaft 22 and remains in place, then the sleeve shaft 22 cannot rotate, and the drive shaft 10, the sleeve shaft 22 and the spring 21 are locked together, and the position of the drive shaft 10 is locked.

[0041] like Figure 3 and Figure 4 As shown, in this embodiment, the locking ring 20 has protrusions on both sides, which respectively cooperate with the straight grooves on both sides of the upper inner wall of the cylinder 8, so that the locking ring 20 can only slide axially and cannot rotate.

[0042] like Figure 3 As shown, in this embodiment, the upper part of the cylinder 8 is provided with two-stage stepped holes. The upper stepped hole is provided with a stop block, and the lower stepped hole is provided with a bearing 24. The lower end of the sleeve shaft 22 passes through the stop block 23 and then through the bearing 24 to abut against the first spring 25. The two ends of the second spring 21 abut against the locking ring 20 and the stop block 23 respectively. The bearing 24 allows the sleeve shaft 22 to rotate more smoothly, and the stop block 23 provides support for the second spring 21.

[0043] like Figure 4As shown, in this embodiment, the ends of the spline and spline groove are provided with guide structures to facilitate mutual insertion; even if the spline and spline groove are misaligned before mutual insertion, the sleeve shaft 22 can be guided to rotate a small angle under the action of the guide structure so that the two can be smoothly inserted into each other.

[0044] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the locking mechanism 7 includes a mounting base 9 fixed to the chair leg 2, a pull rod 16 slidably fitted on the mounting base 9, a spring 15 sleeved on the pull rod 16, a pressure block 14 connected to the upper end of the pull rod 16, a cable 17 connected to the lower end of the pull rod 16, and an operating handle (not shown) connected to the cable 17. The pressure block 14 is located directly above the locking ring 20. The spring 15 always applies an upward force away from the locking ring 20 to the pressure block 14. The upper end of the drive shaft 10 passes through the pressure block 14. Initially, the pressure block 14 is separated from the locking ring 20. The operating handle can drive the pull rod 16 and the pressure block to move downward against the force of the spring 15 through the cable 17, thereby driving the locking ring 20 to move downward against the force of the spring 21 and engage with the sleeve shaft 22 via a spline. The operating handle has a locked position and an unlocked position. In the locked position, the cable 17 can only be pulled downward in one direction. In the unlocked position, the cable 17 can move in both directions. After the gear is adjusted, the operating handle is placed in the locked position. Pulling the lever 16 with the operating handle moves the pressure block 14 down, which in turn moves the locking ring 20 down to engage with the sleeve shaft 22 via splines, locking the position of the transmission shaft 10, i.e., locking the gear. When unlocking is required, the operating handle is placed in the unlocked position. Spring 3 15 returns to its original position, causing the pressure block 14 to move away from the locking ring 20. Spring 2 21 returns to its original position, causing the locking ring 20 to move away from the sleeve shaft 22, unlocking the position of the transmission shaft 10, i.e., unlocking the gear.

[0045] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the cylinder 8 is mounted on the mounting base 9, the pull rod 16 is located on both sides of the cylinder 8, and the pressure block 14 is connected between the pull rods 16 on both sides; the cylinder 8 and the pull rod 16 are both mounted on the mounting base 9, which is convenient to install and easy to arrange. The pull rods 16 on both sides drive the pressure block 14 between them at the same time, and the pressure block 14 moves smoothly.

[0046] like Figure 1 , Figure 2 and Figure 6 As shown, in this embodiment, the transmission mechanism includes a connecting rod 18 and a guide member 13 and a sliding member 19 forming a sliding pair. The two ends of the connecting rod 18 are respectively hinged to the lower end of the transmission shaft 10 and one end of the sliding member 19. The other end of the sliding member 19 is fixedly connected to a stop pin. The guide member 13 is fixedly connected to the external connection point 29. When the transmission shaft 10 moves downward, the connecting rod 18 drives the sliding member 19 and the stop pin to move towards the energy absorption module 12. The connecting rod 18, the guide member 13 and the sliding member 19 can transmit power and also transmit force after locking.

[0047] like Figure 6 As shown, in this embodiment, the slider 19 has protrusions on both sides, which respectively cooperate with the straight grooves on both sides of the inner wall of the guide 13, so that the slider 19 can only slide laterally and cannot rotate.

[0048] like Figure 1 As shown, in this embodiment, the guide member 13 is slidably engaged with the chair basin 1 through the sliding seat 11 and the sliding direction is the lifting direction of the chair basin 1. The sliding seat 11 is installed on the chair basin 1 (by screws). For the chair basin 1 to lift and slide smoothly, there needs to be a sliding pair with the chair legs 2 on both sides, top and bottom. The lower sliding pair may be interfered with by the energy absorption module 12. Therefore, the guide member 13 and the sliding seat 11 are combined to form the lower sliding pair, which will not affect the energy absorption module.

[0049] like Figure 1 , Figure 2 and Figure 8 As shown, in this embodiment, the energy absorption module 12 includes a flip plate 32 for absorbing energy by material deformation, and an external block 28, a pressure plate 35, and a pressure plate 34 located above the flip plate 32. The upper end of the flip plate 32 is bent into an inverted U-shape to form a bent portion 33 and then extends laterally to form a transverse portion 31. The external block 28 is connected to the transverse portion 31 by screws. An external contact point 29 is provided on the external block 28. The pressure plate 35 and the pressure plate 34 are located on the upper side of the transverse portion 31 and are stacked between the external block 28 and the bent portion 33. The pressure plate 34 is closer to the bent portion 33 than the pressure plate 35. The energy absorption module 12 has three levels. In the first level, only the external block 28 presses down on the flip plate 32. In the second level, the external block 28 and the pressure plate 34 press down on the flip plate 32 at the same time. In the third level, the external block 28, the pressure plate 35, and the pressure plate 34 press down on the flip plate 32 at the same time. The radius of curvature of the flip plate 32 after being pressed directly affects its energy absorption effect. When only the outer block 28 presses down on the flip plate 32, the lateral movement space of its bent part 33 is large, the radius of curvature is large, and the energy absorption effect is weak. When the outer block 28, the first pressure plate 35 and the second pressure plate 34 press down on the flip plate 32 at the same time, the lateral movement space of its bent part 33 is small, the radius of curvature is small, and the energy absorption effect is strong. When the outer block 28 and the second pressure plate 34 press down on the flip plate 32 at the same time, the lateral movement space of its bent part 33 is between the two, the radius of curvature is between the two, and the energy absorption effect is between the two.

[0050] In this embodiment, the applicable occupant range of the device includes male pilots from the 95th percentile to female pilots from the 5th percentile: when in the first position, the device is in a low load state, corresponding to the starting load of occupant percentiles 5-35; when in the second position, the device is in a medium load state, corresponding to the starting load of occupant percentiles 35-65; and when in the third position, the device is in a high load state, corresponding to the starting load of occupant percentiles 65-95.

[0051] like Figure 7 and Figure 8 As shown, in this embodiment, the gear pin includes a short pin 26 and a long pin 27 arranged horizontally and vertically respectively. When the drive shaft 10 moves downward, it can drive the short pin 26 and the long pin 27 to move simultaneously towards the energy absorption module 12. The external block 28, the first pressure plate 35, and the second pressure plate 34 are all provided with through holes 30 for the short pin 26 and the long pin 27 to pass through. The lower through hole 30 on the first pressure plate 35 is connected to the opening groove to form an open structure at the bottom, and the other through holes 30 are closed holes. In the first gear position, the short pin 26 fails to enter the upper through hole 30 in the first pressure plate 35, and the long pin 27 fails to enter. In the second gear position, the external block 28 cannot press down the tablet 1 35 and the tablet 2 34 through the lower through hole 30 in the tablet 1 35; in the third gear position, the short pin 26 fails to enter the upper through hole 30 in the tablet 1 35, and the long pin 27 enters the lower through hole 30 in the tablet 2 34. The external block 28 can press down the tablet 2 34 but cannot press down the tablet 1 35; in the third gear position, the short pin 26 enters the upper through hole 30 in the tablet 1 35, and the long pin 27 enters the lower through hole 30 in the tablet 2 34. The external block 28 can press down the tablet 1 35 and the tablet 2 34 simultaneously.

[0052] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. An energy-absorbing device with automatic matching function of human chair load, installed on a helicopter passenger seat, characterized in that: The energy absorption module and the gear shifting module; the energy absorption module is used for absorbing energy during the falling process, which is arranged on the chair leg and has an external connection point and gears corresponding to different energy absorption effects; The gear shifting module is used for automatically matching gears according to the load of the person on the chair and can be operated to lock and unlock the gears, and comprises a cylinder body fixed on the chair leg, a spring I and a force transmission mechanism located in the cylinder body, a transmission shaft passing through the cylinder body and the spring I and capable of ascending and descending with the chair basin, a transmission mechanism arranged on the external connection point, a gear pin used for changing the position to match different gears, and a locking mechanism used for operating to lock and unlock the position of the transmission shaft, the force transmission mechanism is used for transmitting the load received by the transmission shaft to the spring I, and the greater the load is, the greater the descending amount of the transmission shaft and the compression amount of the spring I are, the input end and the output end of the transmission mechanism are connected with the lower end of the transmission shaft and the gear pin respectively, the transmission shaft can drive the gear pin to change the position through the transmission mechanism, and the greater the descending amount of the transmission shaft is, the stronger the energy absorption effect of the gear matched by the gear pin is.

2. The energy absorption device with automatic matching function of human chair load according to claim 1, characterized in that: The energy absorption module comprises a turnover plate used for absorbing energy by material deformation, an external block, a pressing sheet I and a pressing sheet II located above the turnover plate, the upper end of the turnover plate is bent into a reverse U shape to form a bent part and then extends horizontally to form a horizontal part, the external block is connected with the horizontal part, the external connection point is arranged on the external block, the pressing sheet I and the pressing sheet II are located on the upper side of the horizontal part and are stacked between the external block and the bent part, the pressing sheet II is closer to the bent part than the pressing sheet I, and the energy absorption module has three gears, in the first gear, only the external block presses the turnover plate downward, in the second gear, the external block and the pressing sheet II press the turnover plate downward at the same time, and in the third gear, the external block, the pressing sheet I and the pressing sheet II press the turnover plate downward at the same time.

3. The energy absorption device with automatic matching function of human chair load according to claim 2, characterized in that: The gear pin comprises a short pin and a long pin arranged horizontally and upward and downward respectively, the transmission shaft can drive the short pin and the long pin to move toward the energy absorption module at the same time when the transmission shaft descends, the external block, the pressing sheet I and the pressing sheet II are all provided with through holes through which the short pin and the long pin pass, the through hole located below on the pressing sheet I is communicated with the open slot to form a structure open downward, and the remaining through holes are closed holes; in the first gear, the short pin cannot enter the through hole located above in the pressing sheet I, and the long pin cannot enter the through hole located below in the pressing sheet II; in the second gear, the short pin cannot enter the through hole located above in the pressing sheet I, and the long pin enters the through hole located below in the pressing sheet II; in the third gear, the short pin enters the through hole located above in the pressing sheet I, and the long pin enters the through hole located below in the pressing sheet II.

4. The energy absorption device with the automatic matching function of the human chair load according to any one of claims 1 to 3, characterized in that: The transmission mechanism comprises a connecting rod and a guide and a sliding block constituting a sliding pair, the two ends of the connecting rod are hingedly connected with the lower end of the transmission shaft and one end of the sliding block respectively, the other end of the sliding block is fixedly connected with the gear pin, and the guide is fixedly connected on the external connection point, the transmission shaft drives the sliding block and the gear pin to move toward the energy absorption module when the transmission shaft descends.

5. The energy absorption device with automatic matching function of human chair load according to claim 4, characterized in that: The guide is slidably connected with the chair basin through a sliding seat and the sliding direction is the ascending and descending direction of the chair basin, and the sliding seat is installed on the chair basin.

6. The energy absorption device with automatic matching function of human chair load according to claim 1, characterized in that: The force transmission mechanism comprises a sleeve shaft threadedly fitted on the transmission shaft, a spring II fitted on the sleeve shaft, a locking ring non-rotatably and slidingly fitted on the upper end of the cylinder, the lower end of the sleeve shaft abutting against the spring I, the outer wall of the upper part of the sleeve shaft being provided with splines, the locking ring being internally provided with spline grooves capable of cooperating with the splines, the spring II always applying an upward force away from the sleeve shaft to the locking ring, the upper end of the transmission shaft penetrating the locking ring, and the locking ring being initially separated from the sleeve shaft.

7. The energy absorption device with automatic matching function of human chair load according to claim 6, characterized in that: The upper part of the cylinder is provided with two stepped holes, the upper stepped hole being provided with a stopper and the lower stepped hole being provided with a bearing, the lower end of the sleeve shaft penetrating the stopper and then the bearing and abutting against the spring I.

8. The energy absorption device with automatic matching function of human chair load according to claim 6, characterized in that: The end portions of the splines and the spline grooves are provided with guide structures for facilitating mutual insertion.

9. The energy absorption device with the automatic matching function of the human chair load according to any one of claims 6 to 8, characterized in that: The locking mechanism comprises a mounting seat fixed on the chair leg, a pull rod slidingly fitted on the mounting seat, a spring III fitted on the pull rod, a pressing block connected to the upper end of the pull rod, a pull cable connected to the lower end of the pull rod, and a handle connected to the pull cable, the pressing block being directly above the locking ring, the spring III always applying an upward force away from the locking ring to the pressing block, the upper end of the transmission shaft penetrating the pressing block, the pressing block being initially separated from the locking ring, the handle being capable of driving the pull rod and the pressing block to move downward against the force of the spring III and in turn driving the locking ring to move downward against the force of the spring II and cooperate with the splines of the sleeve shaft, the handle having a locking position and an unlocking position, the pull cable being capable of being pulled downward only in one direction in the locking position, and the pull cable being capable of moving bidirectionally in the unlocking position.

10. The energy absorption device with automatic matching function of human chair load according to claim 1, characterized in that: The upper end of the transmission shaft is connected to the chair basin through an adapter, the adapter comprising an integral or fixed mounting block and a sleeve, the mounting block being mounted on the chair basin, the sleeve being transversely and slidingly fitted with a support rod, the support rod being integrally or fixedly provided with a sliding block, the sliding block being slidingly fitted with the chair leg and the sliding direction being the lifting direction of the chair basin, and the transmission shaft being fixed on the mounting block or the sleeve.

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