Lightweight variable load seat energy absorption device

Abstract

The invention discloses a light variable load seat energy absorption device, comprising a steel wire, a bending wire assembly, a connecting assembly and a shearing piece; the steel wire is a vertical energy absorption component; the bending wire assembly is connected to the movable part of the seat, the steel wire passes through the shell of the bending wire assembly, and the part inside the shell is provided with a bending section, the shell of the bending wire assembly is provided with a guide wheel and an adjustment mechanism, the guide wheels are located at both ends of the bending section of the steel wire and clamped on both sides of the steel wire, the adjustment mechanism comprises a support wheel that is pressed against the groove of the bending section of the steel wire, and the adjustment mechanism can adjust the ejection distance of the support wheel to adjust the bending degree of the bending section of the steel wire; both connecting assemblies are connected and fixed to the fixed part of the seat and are respectively connected and fixed to both ends of the steel wire; the shearing piece is connected and fixed to the upper connecting assembly and the bending wire assembly at the same time, and the shearing piece breaks when the impact acceleration exceeds a certain degree. The device is reliable to start, has a variable load function, is light in weight, has low cost, and has a wide range of applications.

Description

Technical Field

[0001] The invention relates to an energy absorbing device, in particular to a light variable load seat energy absorbing device. Background Art

[0002] Seat energy absorption devices, especially helicopter seat energy absorption devices, as components that are in direct contact with pilots and passengers, have increasingly higher requirements. They are required to be light in weight and provide the same protection to passengers of different percentiles. Therefore, variable load energy absorption technology has emerged, which can adjust the starting load of the energy absorption device according to the weight of the passengers. The current variable load energy absorption device uses a combination of reverse pull tubes and rolling tubes to achieve variable load energy absorption, but it has the disadvantages of heavy weight, complex processing technology (the manufacturing process of reverse pull tubes and rolling tubes is complex, and the processing cost is high), and unreliable operation. Summary of the invention

[0003] The object of the present invention is to provide a light variable load seat energy absorption device, which has reliable startup, variable load function, light weight, low cost and wide application range.

[0004] The technical solution adopted by the present invention is: a light variable load seat energy absorption device, including a steel wire, a bending wire assembly, a connecting assembly and a shearing piece; the steel wire is a vertical energy absorption component; the bending wire assembly is connected and fixed to the movable part of the seat, the steel wire passes through the shell of the bending wire assembly and the part inside the shell is provided with a bending section, the shell of the bending wire assembly is provided with a guide wheel and an adjustment mechanism, the guide wheels are located at both ends of the bending section of the steel wire and are clamped on both sides of the steel wire, the adjustment mechanism includes a supporting wheel that is pressed against the groove of the bending section of the steel wire, and the adjustment mechanism can adjust the ejection distance of the supporting wheel to adjust the bending degree of the bending section of the steel wire; the two connecting assemblies are both connected and fixed to the fixed part of the seat and are respectively connected and fixed to the two ends of the steel wire; the shearing piece is connected and fixed to the upper connecting assembly and the bending wire assembly at the same time, and the shearing piece breaks when the impact acceleration exceeds a certain level.

[0005] Furthermore, the adjustment mechanism also includes an adjustment nut connected and fixed to the housing of the wire bending assembly, an adjustment rod matched with the adjustment nut, a U-shaped piece for mounting the support wheel through the U-shaped groove, and a guide structure on the housing of the wire bending assembly. The end of the U-shaped piece away from the support wheel is connected to the top of the adjustment rod, and the adjustment rod can drive the U-shaped piece to move forward along the guide structure to adjust the support wheel.

[0006] Ejection distance.

[0007] Furthermore, the adjusting rod is evenly distributed with positioning grooves in the circumferential direction, and a positioning bead is fixedly provided on the shell of the wire bending assembly, and the top end of the positioning bead fits in the positioning groove.

[0008] Furthermore, an indicator rod is provided on the U-shaped part, and a long hole is provided on the shell of the wire bending assembly. The indicator rod passes through the long hole and out of the shell of the wire bending assembly and can move along the long hole. There are engraved lines on the indicator rod, and a scale is provided along the long hole. The distance between the engraved lines and the scale reflects the degree of ejection of the support wheel.

[0009] Furthermore, the thread lead angle between the adjusting rod and the adjusting nut is no greater than 2.5°.

[0010] Furthermore, the main body of the connecting component is a connecting block, which is provided with screws, vertical grooves, and pad holes and pressure block holes respectively connected to the vertical grooves. The steel wire passes through the vertical grooves, and pads and pressure blocks are respectively inserted into the pad holes and pressure block holes. When the screws are tightened, the steel wire is pressed against the pad through the pressure block. Grooves are provided on both sides of the steel wire, and the pads and pressure blocks respectively cooperate with the grooves on both sides of the steel wire.

[0011] Furthermore, a shearing groove is provided on the shearing piece, and when the impact acceleration exceeds 6g, the shearing piece breaks at the position of the shearing groove.

[0012] Furthermore, both the guide wheel and the support wheel adopt cylindrical roller bearings.

[0013] The beneficial effects of the present invention are as follows: the device can be started reliably - a bending section is arranged on the steel wire to prevent the load of the shearing piece and the steel wire from being superimposed when the energy absorbing device is started, causing the energy absorbing device to be unable to start, and the shearing piece can prevent the steel wire from being cold-work hardened during the vibration process, resulting in an increase in the energy absorbing load and being unable to start; the device adjusts the bending degree of the bending section of the steel wire through an adjusting mechanism, has a variable load function, and can adjust the starting load according to the weight of the occupants, providing the best protection for occupants of different percentiles - providing the best protection for male occupants from the 95th percentile to female occupants from the 5th percentile, so that they all move downward with a deceleration of no more than 14.5G, ensuring that the overload borne by all occupants does not exceed the human tolerance limit; the device absorbs energy through the steel wire, is light in weight, can be reused by replacing the steel wire, and has low cost; the device can be widely used on helicopter anti-crash seats, and can also be used on vehicle lightning protection seats, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a schematic structural diagram of an embodiment of the present invention.

[0015] FIG. 2 is a schematic diagram of the structure of a connection assembly in an embodiment of the present invention.

[0016] FIG. 3 is a schematic diagram of the structure of a wire bending assembly in an embodiment of the present invention.

[0017] FIG. 4 is an exploded view of the structure of the wire bending assembly in an embodiment of the present invention.

[0018] FIG. 5 is a schematic diagram of a support plate of a wire bending assembly according to an embodiment of the present invention.

[0019] FIG. 6 is a schematic structural diagram of the adjustment mechanism of the wire bending assembly in an embodiment of the present invention.

[0020] FIG. 7 is an exploded view of the structure of the adjustment mechanism of the wire bending assembly in the embodiment of the present invention.

[0021] FIG. 8 is a schematic diagram of the positioning principle of the positioning beads of the wire bending assembly in an embodiment of the present invention.

[0022] In the figure:

[0023] 1-connecting assembly, 101-connecting block, 101a-vertical slot, 101b-pressing block hole, 101c-pad hole, 104-screw, 105-pressing block, 106-pad;

[0024] 2-bending wire assembly, 201-support plate, 201a-scale, 201b-U-shaped boss, 201c-strip boss, 201d-large boss, 201e-small boss, 201f-threaded hole, 201g-long hole, 201h-through hole, 201j-through hole, 2011-support plate, 202-shim, 203-spacer, 205-circlip, 207-cylindrical pin, 208-screw, 209-self-locking nut, 211-guide wheel, 212-cylindrical pad, 213-spring washer, 214 flat washer, 260-adjustment mechanism, 261-adjustment rod, 261a-hexagonal hole, 261b-positioning groove, 261c-thread, 261d-boss, 261e-ring groove, 262-adjustment nut, 263-U Shape, 263a-

[0025] Through hole, 263b-blind hole, 263c-through hole, 264-support wheel, 265-cylindrical pin, 266-indicator rod, 266a-marked line, 267-circlip, 268-gasket, 270-positioning bead;

[0026] 3-steel wire, 3a-groove, 3b-bent section;

[0027] 4-shearing piece, 4a-shearing groove, 4b-cylindrical boss, 4c-through hole;

[0028] 5- Screws. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] As shown in FIG1 , a light variable load seat energy absorption device includes a connection component 1, a bending wire component 2, a steel wire 3, and a shearing piece 4. The connection component 1 is connected to the fixed part of the seat; the bending wire component 2 is connected to the movable part of the seat; the steel wire 3 is an energy absorption component; the shearing piece 4 is connected between the upper connection component 1 and the bending wire component 2, and the shearing piece 4 is fixed to the upper connection component 1 using screws 5.

[0031] As shown in FIG2 , the connection assembly 1 includes a connection block 101, a screw 104, a pressure block 105 and a cushion block 106. The connection block 101 is provided with a vertical slot 101a, a pressure block hole 101b and a cushion block hole 101c; the steel wire 3 is inserted into the vertical slot 101a; the cushion block 106 is installed inside the cushion block hole 101c to support the steel wire 3; the pressure block 105 is installed inside the pressure block hole 101b; the screw 104 is used to press the pressure block 105 to fix the steel wire 3.

[0032] As shown in FIG2 , a shearing groove 4a is provided on the shearing piece 4. When the impact acceleration exceeds 6g, the shearing piece 4 breaks at the position of the shearing groove 4a, which serves to fix the movable part of the seat during normal use of the seat, thereby preventing the steel wire 3 (energy-absorbing structural member) from cold work hardening during vibration, resulting in an increase in the energy-absorbing load and an inability to start.

[0033] As shown in FIG. 3 , grooves are provided on both sides of the steel wire 3 , which cooperate with the pressing block 105 and the cushion block 106 of the connecting assembly 1 to increase the locking force of the steel wire and prevent the steel wire from slipping out of the connecting assembly 1 .

[0034] As shown in FIG. 4 , a bending section is provided on the steel wire 3 to prevent the loads of the shearing member 4 and the steel wire 3 from being superimposed when the energy absorber is activated, thereby preventing the energy absorber from being unable to be activated.

[0035] As shown in Figures 3 and 4, the wire bending assembly 2 includes a support plate 201, a support plate 2011, a pad 202, a partition 203, a retaining ring 205, a cylindrical pin 207, a screw 208, a self-locking nut 209, a guide wheel 211, a cylindrical pad 212, a spring washer 213, a flat washer 214, an adjustment mechanism 260 and a positioning bead 270. There are two pads 202, which are located between the support plate 201 and the support plate 2011; the partition plate 203 is located between the two pads 202; the adjustment mechanism 260 is located between the support plate 201 and the support plate 2011; the cylindrical pin 207 and the screw 208 pass through the support plate 201, the pad 202, the partition plate 203, and the support plate 2011 and cooperate with the retaining ring 205, the self-locking nut 209, the spring washer 213, and the flat washer 214 to play a connecting role; the cylindrical pad 212 passes through the partition plate 203 and is located between the two pads 202 to support the pad 202; the positioning bead 270 is installed on the support plate 201; there are four guide wheels 211.

[0036] As shown in Figs. 4 and 5, the support plate 201 is provided with a scale 201a, a U-shaped boss 201b, a strip boss 201c, a large boss 201d, a small boss 201e, a threaded hole 201f, a long hole 201g, a through hole 201h and a through hole 201j. The scale 201a serves as an adjustment indicator of the starting load of the energy absorbing device; the U-shaped boss 201b serves as a guide and supports the pad 202 for the adjustment mechanism 260; the strip boss 201c serves as a support for the pad 202; the large boss 201d and the small boss 201e serve to fix the adjustment mechanism 260; the threaded hole 201f serves to fix the positioning bead; the long hole 201g is used for the indicator rod 266 to pass through; the through hole 201h is used for the screw 208 to pass through; and the through hole 201j is used for the cylindrical pin 207 to pass through.

[0037] As shown in Figs. 6 and 7, the adjustment mechanism 260 includes an adjustment rod 261, an adjustment nut 262, a U-shaped member 263, a support wheel 264, a cylindrical pin 265, an indicator rod 266, a retaining ring 267, and a gasket 268. The adjustment nut 262 is installed on the adjustment rod 261 to form a threaded pair; the U-shaped member 263 is sleeved on the boss 261d of the adjustment rod 261 and fixed by the retaining ring 267; the gasket 268 is located on both sides of the support wheel 264, installed in the U-shaped member 263, and fixed by the cylindrical pin 265; the indicator rod 266 is installed in the blind hole 263b on the side of the U-shaped member 263; the indicator rod 266 is provided with a scale line 266a to facilitate the adjustment of the starting load of the energy absorbing device. The adjusting rod 261 is provided with an inner hexagonal hole 261a, a positioning groove 261b, a thread 261c, a boss 261d and an annular groove 261e. By rotating the adjusting rod 261, the position of the supporting wheel 264 can be adjusted, thereby achieving the effect of adjusting the starting load of the energy absorbing device.

[0038] In this embodiment, the thread lead angle of the thread 261c should be no greater than 2.5°; the guide wheel 211 and the support wheel 264 use cylindrical roller bearings, which have the characteristics of strong pressure bearing capacity and low friction coefficient.

[0039] As shown in Fig. 8, the positioning bead 270 includes a steel ball, a spring and a housing. The positioning bead can prevent the adjustment rod from loosening in a vibration environment.

[0040] The device is commonly used in helicopter anti-crash seats, and can also be used in vehicle lightning protection seats or other seats, and has a wide range of applications.

[0041] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A light variable load seat energy absorption device, characterized in that: It includes a steel wire, a bending wire assembly, a connecting assembly and a shearing piece; the steel wire is a vertical energy-absorbing component; the bending wire assembly is connected and fixed to the movable part of the seat, the steel wire passes through the shell of the bending wire assembly and the part inside the shell is provided with a bending section, the shell of the bending wire assembly is provided with a guide wheel and an adjusting mechanism, the guide wheels are located at both ends of the bending section of the steel wire and are clamped on both sides of the steel wire, the adjusting mechanism includes a supporting wheel that is pressed against the groove of the bending section of the steel wire, and the adjusting mechanism can adjust the ejection distance of the supporting wheel to adjust the bending degree of the bending section of the steel wire; both connecting assemblies are connected and fixed to the fixed part of the seat and are respectively connected and fixed to both ends of the steel wire; the shearing piece is connected and fixed to the upper connecting assembly and the bending wire assembly at the same time, and the shearing piece breaks when the impact acceleration exceeds a certain level.

2. The light variable load seat energy absorption device as claimed in claim 1, characterized in that: The adjusting mechanism also includes an adjusting nut fixedly connected to the housing of the wire bending assembly, an adjusting rod cooperating with the adjusting nut, a U-shaped piece for mounting the supporting wheel through a U-shaped groove, and a guide structure on the housing of the wire bending assembly. The end of the U-shaped piece away from the supporting wheel is connected to the top of the adjusting rod. The adjusting rod can drive the U-shaped piece to move forward along the guiding structure to adjust the ejection distance of the supporting wheel.

3. The light variable load seat energy absorption device as claimed in claim 2, characterized in that: The adjusting rod is evenly provided with positioning grooves in the circumference, and a positioning bead is fixedly provided on the shell of the wire bending assembly, and the top end of the positioning bead fits in the positioning groove.

4. The light variable load seat energy absorption device as claimed in claim 2, characterized in that: An indicator rod is provided on the U-shaped piece, and a long hole is provided on the shell of the wire bending assembly. The indicator rod passes through the long hole and out of the shell of the wire bending assembly and can move along the long hole. There are engraved lines on the indicator rod, and a scale is provided along the long hole. The distance between the engraved lines and the scale reflects the ejection degree of the support wheel.

5. The light variable load seat energy absorption device as claimed in claim 2, characterized in that: The thread lead angle between the adjusting rod and the adjusting nut shall not exceed 2.5°.

6. The light variable load seat energy absorption device as claimed in claim 1, characterized in that: The main body of the connecting component is a connecting block, which is provided with screws, vertical grooves, and pad holes and pressure block holes respectively connected to the vertical grooves. The steel wire passes through the vertical grooves, and pads and pressure blocks are respectively inserted into the pad holes and pressure block holes. When the screws are tightened, the steel wire is pressed against the pad through the pressure block. Grooves are provided on both sides of the steel wire, and the pads and pressure blocks respectively cooperate with the grooves on both sides of the steel wire.

7. The light variable load seat energy absorption device according to claim 1, characterized in that: A shear groove is provided on the shear piece. When the impact acceleration exceeds 6g, the shear piece breaks at the position of the shear groove.

8. The light variable load seat energy absorption device as claimed in claim 1, characterized in that: Both the guide wheels and support wheels adopt cylindrical roller bearings.

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