CN113147539A - Multistage decelerator and seat - Google Patents
Multistage decelerator and seat Download PDFInfo
- Publication number
- CN113147539A CN113147539A CN202110277332.4A CN202110277332A CN113147539A CN 113147539 A CN113147539 A CN 113147539A CN 202110277332 A CN202110277332 A CN 202110277332A CN 113147539 A CN113147539 A CN 113147539A
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- seat
- stage reduction
- length
- fiber
- reduction unit
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- 230000009467 reduction Effects 0.000 claims abstract description 36
- 239000000835 fiber Substances 0.000 claims description 74
- 229920006253 high performance fiber Polymers 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 6
- 230000003993 interaction Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 210000000038 chest Anatomy 0.000 description 5
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 208000027790 Rib fracture Diseases 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000002612 cardiopulmonary effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 210000001562 sternum Anatomy 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
- B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
Abstract
The invention discloses a multi-stage speed reducing device and a seat. The invention has the beneficial effects that: the other end of the multi-stage speed reduction unit is fixedly connected with the front of the seat, the separable assembly is buckled on the front of the seat through the buckle, when the stress borne by a human body is greater than the breaking threshold value of the buckle, the buckle can be opened, the multi-stage speed reduction unit absorbs energy and reduces speed for many times, the interaction times between the safety belt and the human body are increased, the total duration of the deceleration action and the total distance of the stress action are prolonged, the deceleration peak value of the human body in the automobile impact process is greatly reduced, namely, the maximum stress borne by unit mass, and the personal safety is effectively protected.
Description
Technical Field
The invention relates to the field of automobile safety, in particular to a multi-stage speed reducing device and a seat.
Background
According to data provided by the world health organization, about 125 thousands of people die every year due to road traffic accidents, and tens of millions of people are injured or disabled. Traffic accidents are the leading cause of death among young people of 15-29 years of age. Especially, in recent years, unmanned vehicles are beginning to enter a commercial stage, and it is more important to improve the collision safety performance of vehicles.
The existing automobiles all adopt safety belts and safety airbags as protection devices, but if the movement speed of the automobiles is too high (such as 80km/h-120km/h of the driving speed on a highway), the chest rib fracture and other serious injuries are easily caused and even the lives are threatened because the impact force exerted by the safety belts on the chest is too large when the automobiles are subjected to a front rigid collision. According to the research results in the early 70 th 20 th century in the United states, the human body is seriously injured when the chest is impacted by more than 6.4kN, and sternum and rib fractures and cardiopulmonary injuries occur.
Disclosure of Invention
Aiming at the problems, the invention provides a multi-stage speed reducing device and a seat, which mainly solve the problem that the safety belt causes overlarge impact force on the chest when an automobile collides.
In order to solve the technical problem, the invention provides a multi-stage speed reducing device which comprises a separable assembly and a buckle arranged on the edge of the separable assembly, wherein the front surface of the separable assembly is fixedly connected with a fixing piece of a three-point type safety belt, and the back surface of the separable assembly is fixedly connected with one end of a multi-stage speed reducing unit.
In some embodiments, the separable component is stamped from the front profile of the subject seat.
In some embodiments, the multistage reduction unit comprises k fiber groups, k being a positive integer greater than or equal to 1, the length of each fiber group being different.
In some embodiments, the set of fibers has a length LkL + (k-1) × Δ L, where L is the length of the first bundle of fiber groups, k is the number of the fiber groups, and Δ L is a preset length difference.
In some embodiments, each bundle of the fiber groups is polymerized from m fiber filaments of equal length, m being a positive integer greater than or equal to 2.
In some embodiments, the fiber filaments are high performance fibers having a strength greater than 17.6cN/dtex and an elastic modulus greater than 440 cN/dtex.
In some embodiments, the disengagement threshold of the clasp is 1.6 kN.
Meanwhile, the invention also provides a multi-stage speed reduction seat which comprises the multi-stage speed reduction device and the seat, wherein the other end of the multi-stage speed reduction unit is fixedly connected with the front surface of the seat, and the separable component is buckled on the front surface of the seat through the buckle.
In some embodiments, the seat further comprises a retractable connector, wherein two ends of the retractable connector are fixedly connected with the separable component and the seat respectively.
In some embodiments, the initial telescopic length of the telescopic link is less than the length of the first bundle of the fiber groups, and the ultimate telescopic length of the telescopic link is greater than the length of the kth bundle of the fiber groups.
The invention has the beneficial effects that: the other end of the multi-stage speed reduction unit is fixedly connected with the front of the seat, the separable assembly is buckled on the front of the seat through the buckle, when the stress borne by a human body is greater than the breaking threshold value of the buckle, the buckle can be opened, the multi-stage speed reduction unit absorbs energy and reduces speed for many times, the interaction times between the safety belt and the human body are increased, the total duration of the deceleration action and the total distance of the stress action are prolonged, the deceleration peak value of the human body in the automobile impact process is greatly reduced, namely, the maximum stress borne by unit mass, and the personal safety is effectively protected.
Drawings
FIG. 1 is a perspective view of a multi-stage reduction gear of the present disclosure 1;
FIG. 2 is a perspective view of the multi-stage reduction gear of the present disclosure 2;
FIG. 3 is a perspective view of the disclosed telescoping joint;
FIG. 4 is a schematic diagram of a multi-stage reduction seat in accordance with the present disclosure;
fig. 5 is a schematic diagram comparing deceleration rates of a conventional seat and a multi-stage deceleration seat disclosed in the present invention.
Wherein: 1-separable component, 2-buckle, 3-multistage speed reduction unit, 31-fiber group, 4-telescopic connecting piece and 5-seat.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
Example one
As shown in fig. 1 and 2, the present embodiment provides a multi-stage reduction gear device, which includes a separable assembly 1 and a buckle 2 mounted on the edge of the separable assembly 1, wherein the front surface of the separable assembly 1 is fixedly connected to a fixing member of a three-point safety belt (not shown), and the rear surface of the separable assembly 1 is fixedly connected to one end of a multi-stage reduction gear unit 3. In fig. 1, it can be seen that the three fixing members of the three-point type safety belt are respectively installed on the shoulder side and the waist side of the separable assembly 1, and when the automobile is impacted, the forward tilting inertia of the human body is transmitted to the fixing members of the three-point type safety belt, and the inertia is dispersed to the separable assembly 1 due to the fixed connection of the fixing members and the separable assembly 1.
When the multi-stage speed reducer provided by the invention is used, the other end of the multi-stage speed reducer unit 3 is fixedly connected with the front surface of a seat, the separable component 1 is buckled on the front surface of the seat through the buckle 2, the buckle 2 can be opened only when the stress on a human body is greater than the disengagement threshold of the buckle 2, the interaction times between a safety belt and the human body are increased and the total duration of deceleration action and the total distance of stress action are prolonged through the multiple energy absorption and deceleration of the multi-stage speed reducer unit 3, so that the deceleration peak value of the human body in the automobile collision process, namely the maximum stress on unit mass is greatly reduced, and the personal safety is effectively protected.
In the embodiment, the separable component 1 is formed by punching according to the front profile of the target seat, and the size of the separable component 1 is matched with that of the seat through the matching pre-design, so that the space can be effectively saved, and the buckling effect is improved. The separable set 1 is covered with a trim such as leather similar to the seat cushion so as not to affect the riding comfort.
The multi-stage speed reduction unit 3 is all mechanical equipment capable of realizing multi-stage dispersion of instantaneous tension, and this embodiment proposes one of the embodiments, that is, the multi-stage speed reduction unit 3 includes k fiber groups 31, where k is a positive integer greater than or equal to 1, and the lengths of the fiber groups 31 are different. The length of the fibre group is LkL + (k-1) × Δ L, where L is the length of the first bundle of fiber groups, k is the number of the fiber groups, and Δ L is a preset length difference.
For example, the first fiber bundle is 1cm in length, the second fiber bundle is 1.5cm in length, the third fiber bundle is 2cm in length, … …, the ninth fiber bundle is 5cm in length, and the tenth fiber bundle is 5.5cm in length.
Since the maximum stress to be applied to the fibers of each group is dependent only on the thickness and not on the length, the maximum stress is controlled by adjusting the number of fibers contained in each group of fibers. 6.4kN was used as the impact resistance limit for the thorax. Each fiber group is formed by polymerizing m fiber filaments with equal length, and m is a positive integer greater than or equal to 2. In this embodiment, the first to ninth fiber groups are composed of 8 ultrahigh molecular weight polyethylene fibers having a diameter of 0.5mm (the maximum sustainable stress is about 3200N), and the tenth fiber group is composed of 100 ultrahigh molecular weight polyethylene fibers (the maximum sustainable stress is about 40 kN).
The fiber yarn is high-performance fiber with the strength of more than 17.6cN/dtex and the elastic modulus of more than 440 cN/dtex. Preferably, the fiber yarn is made of ultra-high molecular weight polyethylene fibers, the molecular weight of the ultra-high molecular weight polyethylene fibers is more than 100 ten thousand, and the material is high in strength, low in specific gravity, low in elongation at break, large in breaking work and excellent in buffering and energy absorption characteristics.
When in use, the separable component 1 connected with the fiber group 31 is tightly attached to the backrest of the seat, and the four corners are fastened by the buckles 2. Typical vehicle brakes have a maximum deceleration of about 1.0G-9.8 m/s2When the vehicle is braked suddenly, the maximum stress on the human body is about 0.8kN when the vehicle is braked suddenly, so that the disengagement threshold of the buckle 2 is designed to be 1.6kN, and when the stress is greater than the threshold, the separable component 1 can be separated from the constraint of the disengaging buckle 2 to be separated from the seat. The above disengagement threshold design ensures that the separable assembly 1 will not break loose the buckle and disengage from the seat under normal conditions or during a hard brake with separable assembly 1 being stressed less than 1.6 kN.
The fixed connection of the rear surface of the above-mentioned separable set 1 to one end of the multi-stage reduction unit 3 will be further described below. In some alternative embodiments, the back of the separable assembly 1 is welded with a plurality of fixing posts, the number of the fixing posts is set according to the situation, the number of the fixing posts is at least equal to the number of the fiber group 31, the tail ends of the fixing posts form a bulge part, the tail ends of the fiber group 31 are knotted into a knot and fixed on the fixing posts, and the bulge part is used for preventing the fiber group 31 from falling off from the fixing posts. In some alternative embodiments, the back of the separable set 1 is welded with a plurality of fixing rings, the number of fixing rings is set according to the situation, the number of fixing rings is at least equal to the number of the fiber group 31, the ends of the fiber group 31 are tied into knots and fixed on the fixing rings, and the fixing rings have the function of preventing the fiber group 31 from falling out. In some alternative embodiments, the back surface of the separable component 1 is provided with through holes, the number of the through holes is set according to the situation, the number of the through holes is at least equal to the number of the fiber groups 31, the fiber groups 31 penetrate out of the back surface to the front surface of the separable component 1 through the through holes, the tail ends of the fiber groups 31 are knotted into a knot, and the tail ends of the fiber groups 31 can be fixed on the front surface of the separable component 1 due to the limiting effect of the knot.
Example two
A multi-stage speed reduction seat comprises the multi-stage speed reduction device and a seat 5, wherein the other end of a multi-stage speed reduction unit 3 is fixedly connected with the front surface of the seat 5, and a separable component 1 is buckled on the front surface of the seat 5 through a buckle 2. In this embodiment, the tenth fiber bundle is far higher than the other fiber bundles, and thus the fiber bundle can be used as a final safety member after the other fiber bundles are broken, and the human body can even bear some side impact due to the constraint of the tenth fiber bundle.
In another embodiment, as shown in fig. 3, a telescopic link 4 is further included, and both ends of the telescopic link 4 are fixedly connected to the separable assembly 1 and the seat 5, respectively. Preferably, the separable set 1 is made of a high-strength metal plate, such as stainless steel, one end of the retractable connecting member 4 can be welded to the center of the back of the separable set 1, and the other end of the retractable connecting member can be welded to the metal frame inside the seat 5 as a redundant safety member of the separable set 1, and on this basis, the number of the fiber filaments of the tenth fiber group can be adjusted to 8, or can be continuously set in a state of 100. In an alternative embodiment, the other end of the multi-stage reduction unit 3 is fixedly connected to the front surface of the seat 5 by referring to the above-mentioned "fixing column", "fixing ring" and "through hole" schemes, that is, by providing the "fixing column", "fixing ring" or "through hole" on the metal framework inside the seat 5, the fiber group 31 is finally fixed by the wire knot on the metal framework inside the seat 5. In addition, fig. 4 illustrates a connection manner of the multi-stage reduction seat, the fiber group 31 is arranged around the retractable connecting member 4 in a surrounding posture, and the other end of the fiber group 31 is fixedly connected with the seat 5 by bonding or other connection manners.
The initial telescopic length of the telescopic connecting piece 4 is less than the length of the first bundle of fiber groups, and the limit telescopic length of the telescopic connecting piece 4 is greater than the length of the kth bundle of fiber groups. When the first bundle of fiber group is straightened and broken, the telescopic connecting piece 4 is passively elongated from the initial telescopic length until the kth bundle of fiber group is straightened and broken, and the telescopic connecting piece 4 is locked at the limit telescopic length. Preferably, the telescopic connecting member 4 is a telescopic rod.
An example of a 100% overlap frontal crash of a vehicle traveling at 55km/h will now be analyzed, and FIG. 5 illustrates the deceleration between a conventional seat and a multi-stage deceleration seat of the present invention as a function of time.
In FIG. 5, it can be seen that in the conventional seatThe peak deceleration of the time-varying curve of the human body deceleration is about-500 m/s2. In the multi-stage deceleration seat, when the stress corresponding to the deceleration is increased from 0 to 1.6kN, the separable component 1 breaks away from the restraint of the buckle 2 and is separated from the seat back, and the interaction force of the safety belt and the human body is instantaneously changed to 0. When the first bundle of fiber group is straightened, the interaction force between the safety belt and the human body occurs again, and when the interaction force is increased to 3.2kN of the maximum stress of the single group of fiber, the first bundle of fiber group is broken, and the stress of the safety belt on the human body is instantaneously 0. The human body continues to move forwards at a constant speed delta L equal to 0.5cm at the speed absorbed and decelerated by the safety belt and the fiber group, and pulls down one fiber group. Therefore, the curve of the deceleration changing along with the time in the whole process is in a pulse-type sawtooth shape, and the maximum deceleration is only-280 m/s2. The formulas (1) - (3) are respectively velocity, momentum and kinetic energy change formulas under two different seats in the same process.
Wherein, a1(t) and a2(t) is a function of the deceleration of the human body of the ordinary chair and the chair of the invention with time; f1(t) and F2(t) is a function of the stress on the human body of the ordinary chair and the chair of the invention along with the change of time.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A multi-stage reduction gear, characterized by that, including separable assembly, and the buckle mounted on the edge of the separable assembly, the front of the separable assembly is fixedly connected with the fixed part of the three-point type safety belt, and the back of the separable assembly is fixedly connected with one end of the multi-stage reduction gear unit.
2. The multi-stage reduction unit of claim 1, wherein the separable components are stamped according to the frontal profile of the subject seat.
3. The multi-stage reduction unit according to claim 1, wherein the multi-stage reduction unit comprises k fiber groups, k being a positive integer greater than or equal to 1, the length of each fiber group being different from one fiber group to another.
4. A multi-stage reduction unit according to claim 3, in which the length of the fibre set is such that
Lk＝L+(k-1)*ΔL
Wherein, L is the length of the first bundle of fiber group, k is the number of the fiber group, and Delta L is the preset length difference.
5. A multi-stage reduction unit according to claim 4, in which each said group of fibres is formed by the polymerization of m fibre filaments of equal length, m being a positive integer greater than or equal to 2.
6. The multi-stage reduction unit of claim 5, wherein the fiber filaments are high performance fibers having a strength greater than 17.6cN/dtex and an elastic modulus greater than 440 cN/dtex.
7. The multi-stage reduction unit of claim 1, wherein the disengagement threshold of the catch is 1.6 kN.
8. A multi-stage reduction seat comprising the multi-stage reduction device as claimed in any one of claims 3 to 6 and a seat, wherein the other end of the multi-stage reduction unit is fixedly connected with the front surface of the seat, and the separable component is fastened to the front surface of the seat by the fastener.
9. The multi-level reduction seat of claim 8, further comprising a telescoping connection, both ends of said telescoping connection being fixedly connected to said separable assembly and said seat, respectively.
10. The multi-stage reduction seat of claim 9, wherein the initial telescoping length of the telescoping connectors is less than the length of the first bundle of said fiber sets and the ultimate telescoping length of the telescoping connectors is greater than the length of the kth bundle of said fiber sets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110277332.4A CN113147539A (en) | 2021-03-15 | 2021-03-15 | Multistage decelerator and seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110277332.4A CN113147539A (en) | 2021-03-15 | 2021-03-15 | Multistage decelerator and seat |
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| Publication Number | Publication Date |
|---|---|
| CN113147539A true CN113147539A (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110277332.4A Pending CN113147539A (en) | 2021-03-15 | 2021-03-15 | Multistage decelerator and seat |
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| CN (1) | CN113147539A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937407A (en) * | 1974-05-24 | 1976-02-10 | The United States Of America As Represented By The Secretary Of The Navy | Multiple strap shock absorber |
| US5294183A (en) * | 1991-02-23 | 1994-03-15 | Britax Romer Kindersicherheit Gmbh | Shock absorber for vehicle seat belt |
| US5658012A (en) * | 1995-11-02 | 1997-08-19 | Trw Vehicle Safety Systems Inc. | Seat belt webbing energy management device |
| CA2285486A1 (en) * | 1999-10-07 | 2001-04-07 | Michel Martin | Ejectable safety seat structure for recreational-type vehicles |
| CN103072546A (en) * | 2013-02-20 | 2013-05-01 | 赵颖寅 | Safety belt impact force reducer |
| CN205905942U (en) * | 2016-08-29 | 2017-01-25 | 温州芳植生物科技有限公司 | Car blet pressure relief device |
| CN207809116U (en) * | 2018-01-03 | 2018-09-04 | 珠海阳光儿童用品有限公司 | Child safety seat |
| CN109987004A (en) * | 2018-01-03 | 2019-07-09 | 珠海阳光儿童用品有限公司 | Child safety seat |
-
2021
- 2021-03-15 CN CN202110277332.4A patent/CN113147539A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3937407A (en) * | 1974-05-24 | 1976-02-10 | The United States Of America As Represented By The Secretary Of The Navy | Multiple strap shock absorber |
| US5294183A (en) * | 1991-02-23 | 1994-03-15 | Britax Romer Kindersicherheit Gmbh | Shock absorber for vehicle seat belt |
| US5658012A (en) * | 1995-11-02 | 1997-08-19 | Trw Vehicle Safety Systems Inc. | Seat belt webbing energy management device |
| CA2285486A1 (en) * | 1999-10-07 | 2001-04-07 | Michel Martin | Ejectable safety seat structure for recreational-type vehicles |
| CN103072546A (en) * | 2013-02-20 | 2013-05-01 | 赵颖寅 | Safety belt impact force reducer |
| CN205905942U (en) * | 2016-08-29 | 2017-01-25 | 温州芳植生物科技有限公司 | Car blet pressure relief device |
| CN207809116U (en) * | 2018-01-03 | 2018-09-04 | 珠海阳光儿童用品有限公司 | Child safety seat |
| CN109987004A (en) * | 2018-01-03 | 2019-07-09 | 珠海阳光儿童用品有限公司 | Child safety seat |
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