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

Abstract

The invention discloses an energy absorption device with a human-chair load automatic matching function. The energy absorption device comprises an energy absorption 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] The invention relates to a helicopter anti-crash seat, and in particular to an energy absorbing device with a human-chair load automatic matching function. Background Art

[0002] The impact of a helicopter crash caused by a serious malfunction or being hit during flight can pose a great threat to the lives of the occupants. In order to reduce the impact of a helicopter crash, crash-resistant seats are currently used to absorb the energy of the crash impact. When the helicopter crashes, they limit the load transmitted from the fuselage to the occupants, thereby reducing the casualty rate of the occupants in a survivable crash accident.

[0003] At present, crash-resistant seats use energy absorbers with fixed load-displacement characteristics to decelerate passengers. In order to maximize the efficiency within the weight range of seat passengers, this constant load is designed based on the 50th percentile passenger weight, so it can only provide the best protection for passengers with the 50th percentile weight, allowing them to move downward at a deceleration of no more than 14.5G. However, for heavy passengers, the energy absorption load is too small, and there is a potential risk of the seat hitting the floor, while light passengers cannot fully utilize the effective impact stroke and may be impacted by a higher deceleration than expected. Summary of the invention

[0004] The purpose of the present invention is to provide an energy absorption device with an automatic matching function between a person and a chair load. The device can automatically adjust to a suitable energy absorption effect according to the weight of the occupants, can provide optimal protection for occupants of different percentiles, and minimize the damage to the occupants caused by collision when they are subjected to a large overload.

[0005] The technical solution adopted by the present invention is: An energy absorption device with a function of automatic matching of human and chair loads is installed on a helicopter passenger seat and includes an energy absorption module and a shifting module; the energy absorption module is used to absorb energy during a crash, and is arranged on a chair leg and has an external connection point and gears corresponding to different energy absorption effects; the shifting module is used to automatically match the gear according to the human and chair load and can operate to lock and unlock the gear, and includes a cylinder fixedly connected to the chair leg, a spring and a force transmission mechanism located in the cylinder, a transmission shaft passing through the cylinder and the spring and capable of rising and falling with the chair basin, a transmission mechanism arranged on an external connection point, a gear pin for changing the position to match different gears, and a locking mechanism for operating to lock and unlock the position of the transmission shaft, the force transmission mechanism is used to transmit the load on the transmission shaft to the spring, and the greater the load, the greater the downward displacement of the transmission shaft and the compression of the spring, the input end and the output end of the transmission mechanism are respectively connected to the lower end of the transmission shaft and the gear pin, the transmission shaft can drive the gear pin to change position through the transmission mechanism, and the greater the downward displacement of the transmission shaft, the stronger the energy absorption effect of the gear matched by the gear pin.

[0006] Preferably, the energy absorption module includes a flip plate for absorbing energy by utilizing material deformation, and an external block, a pressure plate one and a pressure plate two located above the flip plate. The upper end of the flip plate is bent in an inverted U shape to form a bending portion and then extends laterally to form a transverse portion. The external block is connected to the transverse portion, and the external connection point is arranged on the external block. Pressure plate one and pressure plate two are located on the upper side of the transverse portion and are stacked between the external block and the bending portion. Pressure plate two is closer to the bending portion than pressure plate one. The energy absorption module has three gears. In the first gear, only the external block presses down the flip plate. In the second gear, the external block and pressure plate two press down the flip plate at the same time. In the third gear, the external block, pressure plate one and pressure plate two press down the flip plate at the same time.

[0007] Preferably, the gear pin includes a short pin and a long pin which are arranged horizontally and respectively up and down. When the transmission shaft moves downward, it can drive the short pin and the long pin to move simultaneously in the direction close to the energy absorption module. The external block, the first pressing plate and the second pressing plate are provided with through holes for the short pin and the long pin to pass through. The through hole located at the bottom on the first pressing plate is connected with the opening groove to form a structure open at the bottom, and the remaining through holes are closed holes; in the first gear position, the short pin cannot enter the through hole located at the top in the first pressing plate, and the long pin cannot enter the through hole located at the bottom in the second pressing plate; in the second gear position, the short pin cannot enter the through hole located at the top in the first pressing plate, and the long pin enters the through hole located at the bottom in the second pressing plate; in the third gear position, the short pin enters the through hole located at the top in the first pressing plate, and the long pin enters the through hole located at the bottom in the second pressing plate.

[0008] Preferably, the transmission mechanism includes a connecting rod and a guide member and a sliding member that constitute 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, and the other end of the sliding member is fixedly connected to the gear pin. The guide member is fixedly connected to the external contact point. When the transmission shaft moves downward, the sliding member and the gear pin are driven by the connecting rod to move toward the direction close to the energy absorption module.

[0009] Preferably, the guide member is slidably matched with the seat basin via a sliding seat, and the sliding direction is the lifting direction of the seat basin, and the sliding seat is installed on the seat basin.

[0010] Preferably, the force transmission mechanism includes a sleeve shaft threadedly mounted on the transmission shaft, a second spring mounted on the sleeve shaft, and a locking ring non-rotatably slidably mounted in the upper end of the cylinder body, the lower end of the sleeve shaft abuts against the first spring, a spline is provided on the upper outer wall, a spline groove that can cooperate with the spline is provided inside the locking ring, the second spring always applies an upward force on the locking ring away from the sleeve shaft, the upper end of the transmission shaft passes through the locking ring, and initially the locking ring is separated from the sleeve shaft.

[0011] Preferably, two-level stepped holes are provided on the upper part of the cylinder, a block is provided in the upper step hole, and a bearing is provided in the lower step hole. The lower end of the sleeve shaft first passes through the block and then through the bearing to resist spring one, and the two ends of spring two respectively resist the locking ring and the block.

[0012] Preferably, the ends of the spline and the spline groove are provided with guiding structures for facilitating mutual insertion.

[0013] Preferably, the locking mechanism includes a mounting seat fixedly connected to the chair leg, a pull rod slidably engaged on the mounting seat, 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 located directly above the locking ring. Spring three always applies an upward force on the pressure block away from the locking ring. The upper end of the transmission 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 the pressure block to overcome the force of spring three and move downward through the cable, and then drive the locking ring to overcome the force of spring two and move downward to cooperate with the spline of the sleeve shaft. The operating handle has a locking position and an unlocking position. In the locking position, the cable can only be pulled downward in one direction, and in the unlocking position, the cable can move in both directions.

[0014] Preferably, the upper end of the transmission shaft is connected to the chair basin through an adapter, and the adapter includes an integral or fixed mounting block and a sleeve. The mounting block is installed on the chair basin, and the sleeve is horizontally and slidably fitted with a support rod. A slider is integrally or fixedly provided on the support rod, and the slider is slidably fitted with the chair leg and the sliding direction is the lifting direction of the chair basin. The transmission shaft is fixedly connected to the mounting block or the sleeve.

[0015] The beneficial effects of the present invention are: The device can automatically adjust to the appropriate energy absorption effect according to the weight of the occupants, can provide the best protection for occupants of different percentiles, and minimize the damage caused by collision when the occupants are subjected to a large overload: before use, first operate the transmission shaft position unlocked by the locking mechanism, and then the occupant sits on the seat basin and drives the seat basin and the transmission shaft to move downward. During the downward movement of the transmission shaft, on the one hand, the force transmission mechanism transfers the load on the transmission shaft to spring one, and the greater the load of the person and chair, the greater the downward movement of the transmission shaft and the compression of spring one. On the other hand, the transmission shaft drives the gear pin to change its position through the transmission mechanism, and the greater the downward movement of the transmission shaft, the stronger the energy absorption effect of the gear matched by the gear pin. Therefore, the greater the load of the person and chair, the stronger the energy absorption effect of the matching gear. After the gear adjustment is completed, the transmission shaft position is locked by operating the locking mechanism. In this way, the gear is fixed and cannot be adjusted, and the adjusted gear can be maintained even if the occupant leaves. Afterwards, if the occupant is replaced or the weight of the occupant changes and needs to be adjusted, first operate the transmission shaft position unlocked by the locking mechanism, and the spring one drives the device to reset, and then the gear adjustment can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1This is a schematic diagram of the installation of the energy absorbing device with the function of automatic matching of human and chair loads in the present invention, in which the cable and the operating handle are not shown.

[0018] Figure 2 2 is a schematic diagram of the structure of the energy absorbing device with the function of automatic matching of human and chair loads in the present invention, in which the operating handle is not shown.

[0019] Figure 3 It is a schematic diagram of a cylinder, a transmission shaft, a spring and a force transmission mechanism in the shift module of the present invention.

[0020] Figure 4 It is a schematic diagram of the assembly of the sleeve shaft and the locking ring in the power transmission mechanism of the present invention.

[0021] Figure 5 Schematic diagram of the structure of the locking mechanism in the shift module of the present invention, in which the operating handle is not shown.

[0022] Figure 6 It is a structural schematic diagram of the transmission mechanism in the shift module of the present invention.

[0023] Figure 7 It is a structural schematic diagram of a sliding member and a shift pin in the transmission mechanism of the present invention.

[0024] Figure 8 It is a disassembly schematic diagram of the energy absorption module in the present invention.

[0025] In the figure: 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-transmission shaft; 11-sliding seat; 12-energy absorption module; 13-guide; 14-pressure block; 15-spring three; 16-pull rod; 17-cable; 18-connecting rod; 19-sliding member; 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 block; 29-external connection point; 30-through hole; 31-transverse part; 32-flip plate; 33-bending part; 34-pressing plate two; 35-pressing plate one. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment clearer, the technical solution in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. The components of the embodiment of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "spring one", "spring two", "spring three", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0032] This embodiment discloses an energy absorption device with a human-chair load automatic matching function, which is installed on a helicopter passenger seat and includes an energy absorption module 12 and a shift module; Figure 1 and Figure 2As shown, the energy absorption module 12 is used to absorb energy during the crash, which is arranged on the chair leg 2 and has an external connection point 29 and gears corresponding to different energy absorption effects; the shift module is used to automatically match the gear according to the load of the chair and can operate the locking and unlocking of the gear, which includes a cylinder 8, a spring 25, a force transmission mechanism, a transmission shaft 10, a transmission mechanism, a gear pin and a locking mechanism 7, the cylinder 8 is fixedly connected to the chair leg 2, the spring 25 and the force transmission mechanism are located in the cylinder 8, the transmission shaft 10 passes through the cylinder 8 and the spring 25 and can rise and fall with the chair basin 1, and the force transmission mechanism The structure is used to transfer the load on the transmission shaft 10 to the spring 25, and the greater the load, the greater the downward displacement of the transmission shaft 10 and the compression of the spring 25. The transmission mechanism is arranged on the external connection point 29, and the input end and the output end of the transmission mechanism are respectively connected to the lower end of the transmission shaft 10 and the gear pin. The transmission shaft 10 can drive the gear pin to change position through the transmission mechanism. The gear pin is used to change the position to match different gears. The greater the downward displacement of the transmission shaft 10, the stronger the energy absorption effect of the gear matched by the gear pin. The locking mechanism 7 is used to manipulate the locking and unlocking of the transmission shaft position.

[0033] The device can automatically adjust to the appropriate energy absorption effect according to the weight of the occupant, can provide the best protection for occupants of different percentiles, and minimize the damage caused by collision when the occupant is subjected to a large overload: before use, first operate the transmission shaft 10 position unlocking through the locking mechanism 7, and then the occupant sits on the seat basin 1 and drives the seat basin 1 and the transmission shaft 10 to move downward. During the downward movement of the transmission shaft 10, on the one hand, the force transmission mechanism transmits the load on the transmission shaft 10 to the spring 25, and the greater the load on the chair, the greater the downward movement of the transmission shaft 10 and the compression of the spring 25. On the other hand, The shaft 10 drives the gear pin to change its position through the transmission mechanism, and 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 human chair, the stronger the energy absorption effect of the matching gear. After the gear adjustment is completed, the position of the transmission shaft 10 is locked through the locking mechanism 7. In this way, the gear is fixed and cannot be adjusted, and the adjusted gear can be maintained even if the occupant leaves; afterwards, if the occupant is replaced or the occupant's weight changes and needs to be adjusted, the position of the transmission shaft 10 is first unlocked through the locking mechanism 7, and the spring 25 drives the device to reset, and then the gear adjustment can be performed.

[0034] The seat base 1 and the chair legs 2 are conventional structures. The seat base 1 is used for sitting, and the chair legs 2 are used for providing support and guidance in case of a fall.

[0035] Among them, the spring 1 25 not only plays a supporting role, but also can adapt to the gravity of the passengers to control the downward movement of the transmission shaft 10 of different percentiles, and can also drive the device to reset.

[0036] like Figure 1 As shown, in this embodiment, the energy absorption device is arranged on the left and right sides of the back of the chair basin 1. The use of two sets of left and right devices can ensure smooth movement and guarantee the energy absorption effect.

[0037] like Figure 1 As shown, in the present embodiment, the upper end of the transmission shaft 10 is connected to the chair basin 1 through an adapter, and 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 mounted on 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, and the transmission shaft 10 is fixedly connected to the mounting block 3 or the sleeve 4; integrating the slider 5 and the transmission shaft 10 of the chair basin 1 through the adapter can ensure the positioning accuracy and facilitate the adjustment of the lateral installation position of the device.

[0038] like Figures 1 to 3 As shown, in this embodiment, the force transmission mechanism includes a sleeve shaft 22 threadedly mounted on the transmission shaft 10, a spring 21 mounted on the sleeve shaft 22, and a locking ring 20 non-rotatably slidably mounted on the upper end of the cylinder 8. The lower end of the sleeve shaft 22 abuts against the spring 25, and a spline is formed on the upper outer wall. A spline groove that can cooperate with the spline is formed inside the locking ring 20. The spring 21 always applies an upward force to the locking ring 20 away from the sleeve shaft 22. The upper end of the transmission shaft 10 passes through the locking ring 20, and initially the locking ring 20 is separated from the sleeve shaft 22. When the occupant sits on the seat basin 1, the transmission shaft 10 moves downward, driving the sleeve shaft 22 to press down the spring 25. When the sleeve shaft 22 is subjected to the upward force, it rotates around the transmission shaft 10 under the action of the thread and moves upward relative to the transmission shaft 10 until the force between the transmission shaft 10, the sleeve shaft 22 and the spring 25 reaches a balance and the three stop moving. Thereafter, if the locking ring 20 is pressed down to overcome the force of the spring 21, so that the locking ring 20 and the sleeve shaft 22 are splined and maintained, the sleeve shaft 22 cannot rotate, the transmission shaft 10, the sleeve shaft 22 and the spring 21 are stuck to each other, and the position of the transmission shaft 10 is locked.

[0039] like Figure 3 and Figure 4 As shown, in this embodiment, protrusions are provided on both sides of the locking ring 20, and the protrusions respectively cooperate with the linear grooves on both sides of the upper inner wall of the cylinder 8, so that the locking ring 20 can only slide axially but cannot rotate.

[0040] like Figure 3 As shown, in this embodiment, two-level stepped holes are provided on the upper part of the cylinder 8, a block is provided in the upper step hole, and a bearing 24 is provided in the lower step hole. The lower end of the sleeve shaft 22 first passes through the block 23 and then passes through the bearing 24 to abut against the spring 1 25, and the two ends of the spring 21 respectively abut against the locking ring 20 and the block 23; the bearing 24 can make the sleeve shaft 22 rotate more smoothly, and the block 23 provides support for the spring 21.

[0041] like Figure 4As shown, in this embodiment, the ends of the splines and spline grooves are provided with guiding structures for facilitating mutual insertion; even if the splines and spline grooves are offset before mutual insertion, the guide sleeve shaft 22 can be guided to rotate a small angle under the action of the guiding structure so that the two can be smoothly inserted into each other.

[0042] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the locking mechanism 7 includes a mounting seat 9 fixedly connected to the chair leg 2, a pull rod 16 slidably fitted on the mounting seat 9, a spring three 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, and the spring three 15 always applies an upward force to the pressure block 14 away from the locking ring 20. The upper end of the transmission 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 overcome the force of the spring three 15 and move downward through the cable 17, and then drive the locking ring 20 to overcome the force of the spring two 21 and move downward to cooperate with the sleeve shaft 22 spline. The operating handle has a locking position and an unlocking position. When in the locking position, the cable 17 can only be pulled downward in one direction, and when in the unlocking position, the cable 17 can move in both directions. After the gear is adjusted, the operating handle is in the locked position. The operating handle pulls the pull rod 16 to drive the pressure block 14 to move downward, and then drives the locking ring 20 to move downward and cooperate with the spline of the sleeve shaft 22 to lock the position of the transmission shaft 10, that is, to lock the gear. When unlocking is required, the operating handle is in the unlocked position, the spring three 15 is reset to drive the pressure block 14 to leave the locking ring 20, the spring two 21 is reset to drive the locking ring 20 to leave the sleeve shaft 22, and the position of the transmission shaft 10 is unlocked, that is, to unlock the gear.

[0043] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the cylinder 8 is installed on the mounting seat 9, the pull rods 16 are 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 rods 16 are both installed on the mounting seat 9, which is convenient for installation and arrangement. The pull rods 16 on both sides simultaneously drive the pressure block 14 therebetween, and the pressure block 14 moves smoothly.

[0044] 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 that constitute 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, and the other end of the sliding member 19 is fixedly connected to the gear pin. The guide member 13 is fixedly connected to the external contact point 29. When the transmission shaft 10 moves downward, the sliding member 19 and the gear pin are driven by the connecting rod 18 to move toward the direction close to the energy absorption module 12; the connecting rod 18, the guide member 13 and the sliding member 19 can not only transmit power, but also transmit force after locking.

[0045] like Figure 6 As shown, in this embodiment, protrusions are provided on both sides of the sliding member 19, and the protrusions respectively cooperate with the linear grooves on both sides of the inner wall of the guide member 13, so that the sliding member 19 can only slide horizontally but cannot rotate.

[0046] like Figure 1 As shown, in the present embodiment, the guide member 13 is slidably matched 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 (through screws); in order for the chair basin 1 to lift and slide smoothly, sliding pairs are required on both sides and the upper and lower sides with the chair legs 2. The sliding pair below may interfere with the energy absorption module 12. Therefore, the guide member 13 and the sliding seat 11 form a sliding pair below, which will not affect the energy absorption module.

[0047] like Figure 1 , Figure 2 and Figure 8 As shown, in the present embodiment, the energy absorption module 12 comprises a flip plate 32 for absorbing energy by utilizing material deformation, and an external block 28, a pressing sheet 1 35 and a pressing sheet 2 34 located above the flip plate 32. The upper end of the flip plate 32 is bent in an inverted U shape to form a bending 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), and the external connection point 29 is provided on the external block 28. The pressing sheet 1 35 and the pressing sheet 2 34 are located on the upper side of the transverse portion 31 and are stacked between the external block 28 and the bending portion 33. The pressing sheet 2 34 is closer to the bending portion 33 than the pressing sheet 1 35. The energy absorption module 12 has three gears. In the first gear, only the external block 28 presses down the flip plate 32. In the second gear, the external block 28 and the pressing sheet 2 34 press down the flip plate 32 at the same time. In the third gear, the external block 28, the pressing sheet 1 35 and the pressing sheet 2 34 press down the flip plate 32 at the same time. The flipping curvature radius of the flip plate 32 after being compressed can directly affect the energy absorption effect of the flip plate 32. When only the external block 28 presses down the flip plate 32, the lateral activity space of the bent portion 33 is larger, the flipping curvature radius is larger, and the energy absorption effect is weaker. When the external block 28, the pressing plate 1 35 and the pressing plate 2 34 press down the flip plate 32 at the same time, the lateral activity space of the bent portion 33 is smaller, the flipping curvature radius is smaller, and the energy absorption effect is stronger. When the external block 28 and the pressing plate 2 34 press down the flip plate 32 at the same time, the lateral activity space of the bent portion 33 is between the above two, the flipping curvature radius is between the above two, and the energy absorption effect is between the above two.

[0048] In this embodiment, the occupant applicable range of the device includes the 95th percentile male pilot to the 5th percentile female pilot: when in the first gear, the device is in a low load state, corresponding to the starting load of the occupant percentile 5-35; when in the second gear, the device is in a medium load state, corresponding to the starting load of the occupant percentile 35-65; when in the third gear, the device is in a high load state, corresponding to the starting load of the occupant percentile 65-95.

[0049] like Figure 7 and Figure 8 As shown, in this embodiment, the gear pin includes a short pin 26 and a long pin 27 which are arranged horizontally and respectively up and down. When the transmission shaft 10 moves downward, it can drive the short pin 26 and the long pin 27 to move simultaneously in the direction close to the energy absorption module 12. The external block 28, the pressing plate 1 35 and the pressing plate 2 34 are all provided with through holes 30 for the short pin 26 and the long pin 27 to pass through. The through hole 30 located at the bottom of the pressing plate 1 35 is connected with the open groove to form a structure open at the bottom, and the other through holes 30 are closed holes. In the first gear position, the short pin 26 cannot enter the through hole 30 located at the top of the pressing plate 1 35, and the long pin 27 cannot enter The through hole 30 located at the bottom of the pressing plate 2 34 cannot be pressed down by the external block 28 with the pressing plate 1 35 and the pressing plate 2 34; in the second gear position, the short pin 26 cannot enter the through hole 30 located at the top of the pressing plate 1 35, and the long pin 27 enters the through hole 30 located at the bottom of the pressing plate 2 34, and the external block 28 can carry the pressing plate 2 34 downward but cannot carry the pressing plate 1 35; in the third gear position, the short pin 26 enters the through hole 30 located at the top of the pressing plate 1 35, and the long pin 27 enters the through hole 30 located at the bottom of the pressing plate 2 34, and the external block 28 can carry the pressing plate 1 35 and the pressing plate 2 34 downward at the same time.

[0050] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. An energy absorption device with automatic load matching function for a person and a chair, installed on a helicopter crew seat, characterized in that: It includes an energy absorption module and a gear shift module; the energy absorption module is used to absorb energy during a crash, and is arranged on the chair legs and has external connection points and gears corresponding to different energy absorption effects; The gear shift module is used to automatically match the gear according to the load of the person on the chair and can operate the locking and unlocking of the gear. It includes a cylinder fixedly connected to the chair leg, a spring and a force transmission mechanism located in the cylinder, a transmission shaft passing through the cylinder and the spring and capable of rising and falling with the chair basin, a transmission mechanism arranged on an external contact point, a gear pin for changing the position to match different gears, and a locking mechanism for operating the locking and unlocking of the position of the transmission shaft. The force transmission mechanism is used to transfer the load on the transmission shaft to the spring, and the greater the load, the greater the downward displacement of the transmission shaft and the compression of the spring. The input and output ends of the transmission mechanism are respectively connected to the lower end of the transmission shaft and the gear pin. The transmission shaft can drive the gear pin to change position through the transmission mechanism. The greater the downward displacement of the transmission shaft, the stronger the energy absorption effect of the gear matched by the gear pin.

2. The energy absorption device with automatic load matching function for a person and a chair as claimed in claim 1, characterized in that: The energy absorption module includes a flip plate for absorbing energy by utilizing material deformation, and an external block, a pressure plate one and a pressure plate two located above the flip plate. The upper end of the flip plate is bent in an inverted U shape to form a bending portion and then extends laterally to form a transverse portion. The external block is connected to the transverse portion, and the external connection point is arranged on the external block. Pressure plates one and two are located on the upper side of the transverse portion and are stacked between the external block and the bending portion. Pressure plate two is closer to the bending portion than pressure plate one. The energy absorption module has three gears. In the first gear, only the external block presses down the flip plate. In the second gear, the external block and pressure plate two press down the flip plate at the same time. In the third gear, the external block, pressure plate one and pressure plate two press down the flip plate at the same time.

3. The energy absorption device with automatic load matching function for a person and a chair as claimed in claim 2, characterized in that: The gear pin includes a short pin and a long pin which are arranged horizontally and respectively up and down. When the transmission shaft moves downward, it can drive the short pin and the long pin to move simultaneously in the direction close to the energy absorption module. The external block, the first pressing plate and the second pressing plate are provided with through holes for the short pin and the long pin to pass through. The through hole located at the bottom of the first pressing plate is connected with the opening groove to form a structure open at the bottom, and the other through holes are closed holes; in the first gear position, the short pin cannot enter the through hole located at the top of the first pressing plate, and the long pin cannot enter the through hole located at the bottom of the second pressing plate; in the second gear position, the short pin cannot enter the through hole located at the top of the first pressing plate, and the long pin enters the through hole located at the bottom of the second pressing plate; in the third gear position, the short pin enters the through hole located at the top of the first pressing plate, and the long pin enters the through hole located at the bottom of the second pressing plate.

4. The energy absorbing device with automatic matching function of human-chair load according to any one of claims 1 to 3, characterized in that: The transmission mechanism includes a connecting rod and a guide member and a sliding member that constitute 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 the gear pin. The guide member is fixedly connected to the external contact point. When the transmission shaft moves downward, the sliding member and the gear pin are driven by the connecting rod to move toward the direction close to the energy absorption module.

5. The energy absorption device with automatic load matching function for a person and a chair as claimed in claim 4, characterized in that: The guide piece is slidably matched with the chair basin through a sliding seat, and the sliding direction is the lifting direction of the chair basin. The sliding seat is installed on the chair basin.

6. The energy absorption device with automatic matching function of human-chair load as claimed in claim 1, characterized in that: The force transmission mechanism includes a sleeve shaft threadedly mounted on the transmission shaft, a spring 2 mounted on the sleeve shaft, and a locking ring non-rotatably slidably mounted in the upper end of the cylinder body. The lower end of the sleeve shaft abuts against the spring 1, a spline is provided on the upper outer wall, and a spline groove that can cooperate with the spline is provided inside the locking ring. The spring 2 always applies an upward force to the locking ring away from the sleeve shaft, and the upper end of the transmission shaft passes through the locking ring. Initially, the locking ring is separated from the sleeve shaft.

7. The energy absorption device with automatic load matching function for a person and a chair as claimed in claim 6, characterized in that: Two-level stepped holes are arranged on the upper part of the cylinder, a block is arranged in the upper step hole, and a bearing is arranged in the lower step hole. The lower end of the sleeve shaft first passes through the block and then passes through the bearing to abut against spring one, and the two ends of spring two respectively abut against the locking ring and the block.

8. The energy absorption device with automatic load matching function for a person and a chair as claimed in claim 6, characterized in that: The ends of the splines and the spline grooves are provided with guiding structures for facilitating mutual insertion.

9. The energy absorbing device with automatic matching function of human-chair load according to any one of claims 6 to 8, characterized in that: The locking mechanism includes a mounting seat fixedly connected to the chair leg, a pull rod slidably fitted on the mounting seat, 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 located directly above the locking ring. Spring three always applies an upward force on the pressure block away from the locking ring. The upper end of the transmission 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 the pressure block to overcome the force of spring three and move downward through the cable, and then drive the locking ring to overcome the force of spring two and move downward to cooperate with the spline of the sleeve shaft. The operating handle has a locking position and an unlocking position. In the locking position, the cable can only be pulled downward in one direction, and in the unlocking position, the cable can move in both directions.

10. The energy absorption device with automatic load matching function for a person and a chair as claimed in claim 1, characterized in that: The upper end of the transmission shaft is connected to the chair basin through an adapter, and the adapter includes an integral or fixed mounting block and a sleeve. The mounting block is installed on the chair basin, and the sleeve is horizontally and slidably matched with a support rod. A slider is integrally or fixedly connected to the support rod. The slider is slidably matched with the chair leg and the sliding direction is the lifting direction of the chair basin. The transmission shaft is fixedly connected to the mounting block or sleeve.

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