CN107672556B - Pretension safety belt with air leakage structure - Google Patents
Pretension safety belt with air leakage structure Download PDFInfo
- Publication number
- CN107672556B CN107672556B CN201710952327.2A CN201710952327A CN107672556B CN 107672556 B CN107672556 B CN 107672556B CN 201710952327 A CN201710952327 A CN 201710952327A CN 107672556 B CN107672556 B CN 107672556B
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- rack assembly
- filter screen
- diameter cylinder
- shaped frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 69
- 239000010959 steel Substances 0.000 claims abstract description 69
- 238000004804 winding Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000013022 venting Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 206010008469 Chest discomfort Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
- B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
- B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
- B60R2022/4661—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators comprising venting means, e.g. for avoiding overpressure in case of fire or for allowing return motion with energy absorption
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
- Air Bags (AREA)
Abstract
The invention relates to the technical field of passive safety devices, in particular to a pre-tightening safety belt with an air leakage structure, which comprises an air generator, a rack assembly, a steel pipe, a belt winding drum assembly, a U-shaped frame and a steel wire filter screen, wherein the side surface of the steel pipe is riveted with the U-shaped frame, the side surface of the steel pipe, which is close to the U-shaped frame, is provided with an air leakage hole, and the air leakage hole is provided with the steel wire filter screen. Compared with the prior art, the invention adds the air release hole on the steel pipe of the pretensioner, so that redundant high-temperature and high-pressure air is discharged from the air release hole after the rack component moves downwards through the air release hole. In the reversing process of the gear, the rack assembly moves upwards, high-temperature high-pressure gas in a sealing cavity formed by the rack assembly and the steel pipe is greatly reduced, and resistance to the rack assembly is also reduced, so that shoulder belt force felt by an occupant is smoother, and the protection capability of the occupant is improved. Meanwhile, as the steel wire filter screen is arranged at the outlet of the gas leakage hole, the gas sprayed at high speed has a turbulent flow effect, and the phenomenon of flaming when the high-temperature gas is leaked is avoided.
Description
Technical Field
The invention relates to the technical field of passive safety devices, in particular to a pre-tightening safety belt with an air leakage structure.
Background
The star level of the new car crash test NCAP gradually becomes a hard index of a selected car type of a consumer along with the improvement of the safety consciousness of people since the introduction of the Chinese new car evaluation rule C-NCAP in 2006. In order to meet the demands of people and the demands of national regulations, the host factories need to continuously upgrade the security configuration and improve the constraint performance. The seat belt is an important component of the restraint system, so that more and more host factories choose seat belts with pretensioning function to enhance occupant protection. The pretension structure of the seat belt is various, and the structure of the rack and pinion is one of them.
The rack-and-pinion pre-tightening retractor has the characteristics of high pre-tightening speed, large pre-tightening amount, small energy loss and the like. Referring to fig. 1, the gas generator 1 of the seat belt pretensioner is ignited to generate high temperature and high pressure gas when the seat belt is pretensioned. The high-temperature high-pressure gas pushes the rack assembly 2 to move forwards along the steel pipe 3, and the teeth of the rack assembly 2 are meshed with the gear 4 on the winding drum assembly and drive the winding drum to rotate, so that the webbing is pulled back, and the passengers are bound.
In order to be able to rewind the webbing rapidly and to meet the rewinding amount requirement, it is ensured that a sufficiently high pressure is generated after the gas generator 1 has been detonated. Referring to fig. 2-a and 2-b, when a collision occurs, the gas generator 1 is ignited, and high temperature and high pressure gas pushes the rack assembly 2 to move downward, and the gear 4 is engaged with the teeth of the rack assembly 2 to move counterclockwise. Referring to fig. 2-c, when the rack assembly 2 is pushed to the lowermost end, the rack assembly 2 stops moving, at which time the amount of rollback reaches a maximum, and the powder of the gas generator 1 has been sufficiently burned, generating a large amount of high-temperature and high-pressure gas. Referring to fig. 2-d, the occupant then begins a relative movement and the webbing is pulled out, moving the take-up spool assembly clockwise. The gear 4 on the winding drum assembly is meshed with the teeth of the rack assembly 2 to push the rack assembly 2 to move upwards. At this time, a large amount of high-temperature and high-pressure gas is still sealed in the space formed by the steel pipe 3 and the rack assembly 2, so that the upward movement of the rack assembly 2 is blocked, and the shoulder strap is much larger than the design value, thereby further increasing the chest pressure born by the passengers and affecting the safety of the passengers.
Therefore, it is necessary to design a pretensioner seat belt that can improve the protection ability for the occupant while making the shoulder belt force smoother and can avoid the occurrence of a flame blow phenomenon.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pre-tightening safety belt which can not only enable the shoulder strap force to be smoother and improve the protection capability for passengers, but also avoid the occurrence of a flaming phenomenon.
In order to achieve the above purpose, the invention provides a pre-tightening safety belt with an air leakage structure, which comprises a gas generator, a rack assembly, a steel pipe, a winding drum assembly, a U-shaped frame and a steel wire filter screen, wherein the gas generator is riveted in a cylindrical pipe at the top of the steel pipe, the rack assembly is assembled in the steel pipe, and teeth of the rack assembly are meshed with gears of the winding drum assembly, and the pre-tightening safety belt is characterized in that: the side of the steel pipe is riveted with the U-shaped frame, the side of the steel pipe close to the U-shaped frame is provided with a gas leakage hole, and a steel wire filter screen is arranged at the gas leakage hole.
When the automobile collides and the gas generator is ignited, the rack assembly moves downwards, and when the upper edge of the rack assembly moves to the air release hole, high-temperature and high-pressure gas generated by the gas generator is sprayed out from the air release hole after being disturbed by the steel wire filter screen, and the pressure of the inner cavity of the steel pipe is reduced.
The steel wire filter screen is of a two-section type cylindrical structure and consists of a small-diameter cylinder and a large-diameter cylinder, the small-diameter cylinder is assembled in the air leakage hole of the steel pipe, the large-diameter cylinder is positioned in a gap between the U-shaped frame and the steel pipe, and the large-diameter cylinder limits the axial movement of the steel wire filter screen.
The diameter of the small-diameter cylinder is the same as that of the air leakage hole, and the width of the small-diameter cylinder is smaller than the wall thickness of the steel pipe.
The diameter of the large-diameter cylinder is larger than that of the air leakage hole, and the width of the large-diameter cylinder is smaller than the distance between the U-shaped frame and the steel pipe.
The steel wire filter screen is of a one-section cylindrical structure and consists of a section of cylinder which is welded on the U-shaped frame and corresponds to the position of the air leakage hole.
The width of the cylinder is the distance between the U-shaped frame and the steel pipe.
Compared with the prior art, the invention has the advantages that the venting holes are added at proper positions on the steel pipe of the rack-and-pinion pretensioner, so that redundant high-temperature and high-pressure gas is discharged from the venting holes after the rack assembly moves downwards through the venting holes. In the reversing process of the gear, the rack assembly moves upwards, high-temperature high-pressure gas in a sealing cavity formed by the rack assembly and the steel pipe is greatly reduced, and resistance to the rack assembly is also reduced, so that shoulder belt force felt by an occupant is smoother, and the protection capability of the occupant is improved. Meanwhile, as the steel wire filter screen is arranged at the outlet of the gas leakage hole, the gas sprayed at high speed has a turbulent flow effect, and the phenomenon of flaming when the high-temperature gas is leaked is avoided.
Drawings
Fig. 1 is an exploded view of a prior art rack and pinion pretensioned seat belt.
Fig. 2-a is a schematic diagram of the movement of a rack and pinion pretensioner in the prior art.
Fig. 2-b is a schematic diagram of a rack and pinion pretensioner in the prior art.
Fig. 2-c is a schematic diagram of the movement of a rack and pinion pretensioner in the prior art.
Fig. 2-d is a schematic diagram of the movement of a rack and pinion pretensioner in the prior art.
Fig. 3 is an exploded view of a rack and pinion pretensioned seat belt of a first wire screen of the present invention.
Fig. 4 is a front view of the steel pipe of the present invention.
Fig. 5 is a side view of a first wire screen in accordance with the present invention.
Fig. 6 is a side view of a second wire screen in accordance with the present invention.
Fig. 7 is an exploded view of a rack and pinion pretensioned seat belt of a second wire screen according to the present invention.
Fig. 8-a is a schematic diagram of the movement of the rack and pinion pretensioner according to the present invention.
FIG. 8-b is a second schematic diagram of the movement of the rack and pinion pretensioner in accordance with the present invention.
Fig. 8-c shows a third diagram of the movement of the rack and pinion pretensioner according to the present invention.
Fig. 8-d is a schematic diagram of the movement of the rack and pinion pretensioner in the present invention.
Fig. 9 is a schematic diagram showing the comparison of the shoulder strap force of the prior art and the present invention.
In fig. 9, the solid line shows the shoulder belt force of the pretensioned seat belt with the air release structure of the present invention, the broken line shows the shoulder belt force of the pretensioned seat belt of the prior art, and the abscissa shows time and the ordinate shows the shoulder belt force.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Referring to fig. 3 and 4, the invention relates to a pre-tightening safety belt with an air leakage structure, which comprises a gas generator, a rack assembly, a steel pipe, a winding drum assembly, a U-shaped frame and a steel wire filter screen, wherein the gas generator 1 is riveted in a cylindrical pipe at the top of the steel pipe 3, the rack assembly 2 is assembled in the steel pipe 3, teeth of the rack assembly 2 are meshed with a gear 4 of the winding drum assembly, the side surface of the steel pipe 3 is riveted with the U-shaped frame 5, the side surface of the steel pipe 3, which is close to the U-shaped frame 5, is provided with an air leakage hole 3-1, and the steel wire filter screen 6 is arranged at the air leakage hole 3-1.
Referring to fig. 5, the wire screen 6 is of a two-stage cylindrical structure, and is composed of a small diameter cylinder 6-1 and a large diameter cylinder 6-2, the small diameter cylinder 6-1 is assembled in the vent hole 3-1 of the steel pipe 3, the large diameter cylinder 6-2 is located in a gap between the U-shaped frame 5 and the steel pipe 3, and the large diameter cylinder 6-2 restricts axial movement of the wire screen 6. The diameter of the small diameter cylinder 6-1 is the same as that of the gas release hole 3-1, and the width of the small diameter cylinder 6-1 is smaller than the wall thickness of the steel pipe 3. The diameter of the large-diameter cylinder 6-2 is larger than that of the air leakage hole 3-1, and the width of the large-diameter cylinder 6-2 is smaller than the distance between the U-shaped frame 5 and the steel pipe 3.
During assembly, the gas generator 1 is riveted in a cylindrical pipe of the steel pipe 3, the rack assembly 2 is pushed into the steel pipe 3, the small-diameter cylinder 6-1 is arranged in the gas leakage hole 3-1, the steel pipe 3 is riveted on the U-shaped frame 5, and the large-diameter cylinder 6-2 is arranged in a gap between the steel pipe 3 and the U-shaped frame 5 so as to limit the axial movement of the steel wire filter screen 6.
Referring to fig. 6 and 7, the steel wire filter screen 6 is of a one-section cylindrical structure, and is composed of a section of cylinder 6-3, and the cylinder 6-3 is welded on the U-shaped frame 5 and corresponds to the position of the air leakage hole 3-1. The width of the cylinder 6-3 is the distance between the U-shaped frame 5 and the steel pipe 3.
When high-temperature high-pressure gas is sprayed out of the air leakage hole 3-1, the gas speed is reduced through the steel wire filter screen 6, and meanwhile, the temperature of the gas is reduced, a certain turbulence effect is achieved, and flame generated when the high-temperature gas is directly sprayed out of the air leakage hole is avoided.
Referring to fig. 8-a, when an automobile collides, the gas generator 1 is ignited to generate high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters the inner cavity of the steel pipe 3, and the rack assembly 3 is lifted to be meshed with the gear 4 of the tape winding drum assembly; the high temperature and high pressure gas then moves the rack assembly 2 downward, driving the tape cartridge assembly to rotate counterclockwise.
Referring to fig. 8-b, when the upper edge of the rack assembly 2 moves to the position of the air release hole 3-1, high-temperature and high-pressure air starts to be sprayed out from the air release hole 3-1 after passing through the turbulence of the steel wire filter screen 6, and the pressure of the inner cavity of the steel pipe 3 starts to be reduced.
Referring to fig. 8-c and 8-d, the high temperature and pressure gas continues to push the rack assembly 2 downward to the maximum position, at which time the occupant begins to move, the spool assembly rotates clockwise, and the gear 4 drives the rack assembly 2 upward.
Referring to fig. 9, since most of the gas in the inner cavity of the steel pipe 3 has been ejected from the vent hole 3-1, the resistance to the rack assembly 2 is significantly reduced, and the shoulder belt felt by the corresponding occupant is smoother than the seat belt without the vent structure.
Claims (3)
1. The utility model provides a pretension safety belt with air leakage structure, includes gas generator, rack assembly, steel pipe, winding drum subassembly, U type frame, steel wire filter screen, and gas generator (1) riveting is at the top of steel pipe (3), and rack assembly (2) assemble in steel pipe (3), and the tooth of rack assembly (2) meshes with gear (4) of winding drum subassembly, its characterized in that: the side of the steel pipe (3) is riveted with the U-shaped frame (5), a vent hole (3-1) is formed in the side of the steel pipe (3) close to the U-shaped frame (5), a steel wire filter screen (6) is arranged at the vent hole (3-1), the automobile collides, the gas generator (1) is ignited, the rack assembly (2) moves downwards, and when the upper edge of the rack assembly (2) moves to the position of the vent hole (3-1), high-temperature and high-pressure gas generated by the gas generator (1) is sprayed out from the vent hole (3-1) after being disturbed by the steel wire filter screen (6), and the pressure of the inner cavity of the steel pipe (3) is reduced;
the steel wire filter screen (6) is of a two-section cylindrical structure,
the two-section type cylinder structure consists of a small-diameter cylinder (6-1) and a large-diameter cylinder (6-2), wherein the small-diameter cylinder (6-1) is assembled in a gas leakage hole (3-1) of a steel pipe (3), the large-diameter cylinder (6-2) is positioned in a gap between a U-shaped frame (5) and the steel pipe (3), and the large-diameter cylinder (6-2) limits the axial movement of a steel wire filter screen (6);
the diameter of the small-diameter cylinder (6-1) is the same as that of the air leakage hole (3-1), and the diameter of the large-diameter cylinder (6-2) is larger than that of the air leakage hole (3-1).
2. A pretensioned safety belt provided with a release structure according to claim 1, characterized in that: the width of the small-diameter cylinder (6-1) is smaller than the wall thickness of the steel pipe (3).
3. A pretensioned safety belt provided with a release structure according to claim 1, characterized in that: the width of the large-diameter cylinder (6-2) is smaller than the distance between the U-shaped frame (5) and the steel pipe (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710952327.2A CN107672556B (en) | 2017-10-13 | 2017-10-13 | Pretension safety belt with air leakage structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710952327.2A CN107672556B (en) | 2017-10-13 | 2017-10-13 | Pretension safety belt with air leakage structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107672556A CN107672556A (en) | 2018-02-09 |
| CN107672556B true CN107672556B (en) | 2024-03-12 |
Family
ID=61140150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710952327.2A Active CN107672556B (en) | 2017-10-13 | 2017-10-13 | Pretension safety belt with air leakage structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107672556B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003252172A (en) * | 2002-02-27 | 2003-09-10 | Tokai Rika Co Ltd | Webbing take-up device |
| CN102529881A (en) * | 2010-12-22 | 2012-07-04 | 株式会社东海理化电机制作所 | Pretensioner |
| KR20130080980A (en) * | 2012-01-06 | 2013-07-16 | 현대모비스 주식회사 | A seatbelt retractor |
| CN103562019A (en) * | 2011-05-31 | 2014-02-05 | 芦森工业株式会社 | Seatbelt retractor |
| CN203769886U (en) * | 2014-04-25 | 2014-08-13 | 浙江金飞车辆配件制造有限公司 | Silencer |
| CN207466602U (en) * | 2017-10-13 | 2018-06-08 | 延锋百利得（上海）汽车安全***有限公司 | A kind of pinion and-rack equipped with bleed structure pre-tightens safety belt |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012245960A (en) * | 2011-05-31 | 2012-12-13 | Ashimori Industry Co Ltd | Seatbelt retractor |
-
2017
- 2017-10-13 CN CN201710952327.2A patent/CN107672556B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003252172A (en) * | 2002-02-27 | 2003-09-10 | Tokai Rika Co Ltd | Webbing take-up device |
| CN102529881A (en) * | 2010-12-22 | 2012-07-04 | 株式会社东海理化电机制作所 | Pretensioner |
| CN103562019A (en) * | 2011-05-31 | 2014-02-05 | 芦森工业株式会社 | Seatbelt retractor |
| KR20130080980A (en) * | 2012-01-06 | 2013-07-16 | 현대모비스 주식회사 | A seatbelt retractor |
| CN203769886U (en) * | 2014-04-25 | 2014-08-13 | 浙江金飞车辆配件制造有限公司 | Silencer |
| CN207466602U (en) * | 2017-10-13 | 2018-06-08 | 延锋百利得（上海）汽车安全***有限公司 | A kind of pinion and-rack equipped with bleed structure pre-tightens safety belt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107672556A (en) | 2018-02-09 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20191223 Address after: 201315 4th floor, building 11, No. 957, Kangqiao Road, Pudong New Area, Shanghai Applicant after: YANFENG AUTOMOBILE INTELLIGENT SAFETY SYSTEM Co.,Ltd. Applicant after: Shanghai Lingang Junsheng automobile safety system Co.,Ltd. Address before: 201315 No. 426 Pu Pu Road, Cambridge Industrial Zone, Shanghai, Pudong New Area Applicant before: YANFENG KSS (SHANGHAI) AUTOMOTIVE SAFETY SYSTEMS Co.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |