CN214523695U

CN214523695U - Bolt puller

Info

Publication number: CN214523695U
Application number: CN202120044263.8U
Authority: CN
Inventors: 陈建林; 李俊杰; 杨嘉良; 道格拉斯·厄尔·奥弗顿
Original assignee: Yanfeng Automotive Safety Systems Co Ltd
Current assignee: Yanfeng Automotive Safety Systems Co Ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-10-29
Anticipated expiration: 2031-01-08

Abstract

The utility model belongs to the technical field of car air bag technique and specifically relates to a draw bolt ware, including movable body, shell container, movable body is including some blasting pipes, base, pull rod, and pull rod, some blasting pipes adopt turn-ups structure to fix on the base, and the pull rod is one end opening, other end confined hollow structure, and some blasting pipes cover the open end at the pull rod, and the inside of pull rod is high-pressure buffer, and the space between pull rod and the shell container is high-pressure expansion district, and the surface of pull rod is equipped with the through-hole of UNICOM's high-pressure buffer and high-pressure expansion district. Compared with the prior art, the utility model, adopt flange structure to fix pull rod, point explosion pipe on the base simultaneously, high-pressure buffer sets up inside the pull rod, has improved inside space utilization, has reduced spare part, has realized that the ware is tied to the drawing is miniaturized, also is convenient for tie the ware processing. The O-shaped rings between the base and the shell container and between the pull rod and the shell container can ensure the sealing performance of the bolt pulling device, so that the bolt pulling device can work more reliably and stably.

Description

Bolt puller

Technical Field

The utility model belongs to the technical field of car air bag technique and specifically relates to a bolt puller.

Background

The vehicle airbag module consists of a gas generator and an inflatable airbag. When the automobile collides and sends an ignition signal, the gas generator is instantaneously ignited and generates a large amount of gas. After these gases are discharged into the airbag, the airbag is inflated, thereby achieving the purpose of protecting the occupant from injury. In order to obtain a better restraining performance or reduce injury to the occupant, it is sometimes necessary to adjust the shape of the airbag during deployment, the deployment speed, and the internal pressure of the airbag depending on the size of the occupant.

For example, open-jar JP2011-31656 discloses a method that can realize three different expansion forms of an airbag:

1. the airbag is suitable for occasions with smaller physique of passengers, and the airbag unfolding process is as follows: 1 loosening a rope tied on a rear-side tie puller to enable the upper part of the rear end of the air bag to be freely unfolded upwards, so that the area of the air bag contacting with a passenger is increased; 2 the rope tied on the front side tie pulling device is kept not to be loosened, so that the moving distance of the lower part of the rear end of the air bag is limited, and the impact of the lower part of the rear end of the air bag on a passenger can be reduced; 3 at the same time, because the rope tied on the front side tie pulling device is not loosened, the normally closed pressure relief hole is also opened, thereby reducing the internal pressure of the air bag and reducing the injury to passengers. When the size of the occupant is small, the moving distance of the specific part of the airbag and the internal pressure of the airbag are reduced by increasing the contact area between the airbag and the occupant, so that the injury of the airbag to the small-sized occupant during the unfolding process can be reduced. This reduction in occupant injury is achieved by controlling the release and retention of the attachment cord between the back of the air bag and the bottom of the air bag mounting box by the tie puller.

2. The airbag is suitable for occasions with large physiques of passengers, and the airbag unfolding process is as follows: 1 loosening a rope tied on a front side tie puller to enable the lower part of the rear end of the air bag to move to a position nearest to the abdomen of a passenger, thereby providing the tightest restraint for the abdomen of the passenger; 2 after the other rope tied on the front side bolt pulling device is also loosened, the normally closed pressure relief hole is kept in a closed state. As a result, the internal pressure of the airbag is kept constant, thereby providing stronger restraint to the abdomen of the occupant; 3 simultaneously, the movement distance of the upper part of the rear end of the air bag is limited because the rope tied on the rear-side tie puller is not loosened, thereby increasing the unfolding speed of the lower part of the rear end of the air bag and providing quicker restraint for the abdomen of the passenger. Under the condition that the size of an occupant is large, the moving speed of a specific part of the air bag is increased, the contact distance of the specific part of the air bag and the occupant is kept constant, and therefore a faster and stronger restraining effect is provided for the occupant. The restraint effect is improved by controlling the loosening and maintaining connection of the connecting rope between the back of the air bag and the bottom of the air bag assembly box through the bolt pulling device.

3. Normal deployment of the airbag: when the ropes tied by the rear side tie-pulling device and the front side tie-pulling device are simultaneously loosened, the air bag is unfolded according to a normal shape and speed.

In conclusion, the bolt puller is used for controlling the loosening and the connection maintaining of the connecting rope between the back surface of the air bag and the bottom of the air bag assembling box, so that the unfolding form and speed of the air bag and the internal pressure of the air bag are adjusted, and the purposes of improving the restraint performance of an occupant or reducing the injury to the occupant are achieved. To achieve this, the bolt puller is an indispensable component.

The bolt puller is installed at the outer side of the bottom of the air bag assembly box. The rope connected to a specific portion of the inner side of the airbag is extended to the outside of the airbag-mounting case through a slit or a circular hole formed at the bottom of the airbag-mounting case, and the end of the rope has a loop. Before the bolt puller acts, the pull rod of the bolt puller is in an extending state, and the ring at the end part of the rope is sleeved on the extending pull rod, so that the end part of the rope is not pulled out. So that the portion of the inner side of the airbag connected by the other end of the rope is restrained or the normally closed pressure relief hole is torn. After the bolt puller acts, the pull rod of the bolt puller is in a retreated state, and the ring at the end part of the rope is released. Thus, the part of the inner side of the air bag connected by the other end of the rope is in a freely movable state, or the normally closed pressure relief hole is not torn and continues to be kept in a closed state.

Currently, some manufacturers have developed the above-mentioned bolt puller. For example, patent document US8851519 discloses a structure of a bolt puller, which includes a housing container and a movable body. A space is provided as a high-pressure buffer chamber in the middle of the movable body. A high pressure expansion chamber is formed between the pull rod portion of the movable body and the housing container. The high-pressure buffer chamber and the high-pressure expansion chamber are communicated in pressure through a conduction part with an opening.

When the squib is ignited, since the temperature and pressure of the generated gas are high, a high-pressure environment is first generated in the high-pressure buffer chamber, and then the high pressure in the high-pressure buffer chamber is transmitted into the right high-pressure expansion chamber through the transmission part with the opening. Eventually, the pressure in the high-pressure expansion chamber pushes the movable body to move in the left direction.

However, the bolt puller of this structure has the following disadvantages: 1, a relatively large high-pressure buffer chamber is arranged in the middle of the movable body, so that the miniaturization of the whole bolt puller is not favorable; 2 when the movable body leaves the initial position, the sealing material arranged between the movable body and the shell container is in a state of not being completely restrained, and the sealing material can fall off, so that the sealing failure of the product is caused to cause the flame to be sprayed out from the front and the back of the bolt puller; no particular specification is made on the method for fixing the squib, and for this reason, US8851519 discloses an injection molded body structure of the squib, which is directly fixed to a movable body by injection molding.

In summary, a miniaturized bolt puller needs to be designed, which is convenient for processing and can ensure the stability and reliability of working performance.

Disclosure of Invention

The utility model aims at overcoming the not enough of prior art, providing a miniaturized bolt ware that draws, when being convenient for process, also can guarantee working property's stability and reliable.

In order to achieve the above object, the utility model relates to a bolt puller, including the movable body, the shell container, movable body inserts in the shell container, adopt sliding connection between movable body and the shell container, movable body is including the point tube of exploding, a pedestal, the pull rod, the point tube of exploding adopts turn-ups structure to fix on the base, the pull rod is one end opening, the other end confined hollow structure, the point tube of exploding covers the open end at the pull rod, the inside of pull rod is high-pressure buffer, space between pull rod and the shell container is high-pressure expansion district, the surface of pull rod is equipped with the through-hole of UNICOM's high-pressure buffer and high-pressure expansion district, on the contact surface between base and the shell container, be equipped with an O shape circle on the contact surface between pull rod and the shell container respectively, the shell container is equipped with binding off structure, the binding off structure card is at the spacing inslot on base surface.

The shell container is fixed on a panel at the bottom of the airbag module mounting box by adopting the groove.

The open end of the pull rod is horn-shaped, the end part of the open end is provided with a fixed flange, the fixed flange is fixed in the flanging structure, and the end face of the fixed flange is propped against the point explosion pipe.

The through hole is arranged on the inclined plane of the opening end.

The base, the pull rod surface be equipped with the mounting groove, the O-ring sets up in the mounting groove.

The base be close to flange structure's one end inside be equipped with the igniter tube mounting hole, the igniter tube is fixed in the igniter tube mounting hole.

The structure of the igniter tube mounting hole is matched with the appearance of the igniter tube.

Compared with the prior art, the utility model, adopt flange structure to fix pull rod, point explosion pipe on the base simultaneously, high-pressure buffer sets up inside the pull rod, has improved inside space utilization, has reduced spare part, has realized that the ware is tied to the drawing is miniaturized, also is convenient for tie the ware processing. The O-shaped ring can ensure the sealing performance of the bolt puller, so that the bolt puller can work more reliably and stably.

Drawings

Fig. 1 is a schematic view of the present invention.

Fig. 2 is a schematic view of the pull rod of the present invention.

Fig. 3 is a schematic diagram of the state after ignition of the present invention.

Fig. 4 is a first assembly diagram of the present invention.

Fig. 5 is a second assembly diagram of the present invention.

Fig. 6 is a third assembly diagram of the present invention.

Fig. 7 is a fourth assembly diagram of the present invention.

Detailed Description

The invention will now be further described with reference to the accompanying drawings.

Referring to fig. 1, the utility model relates to a bolt puller, including the movable body, the shell container, the movable body inserts in the shell container 4, adopt sliding connection between movable body and the shell container 4, the movable body is including the point explosion pipe 1, a pedestal 2, pull rod 3, the point explosion pipe 1 adopts turn-ups structure 5 to fix on base 2, pull rod 3 is one end opening, the other end confined hollow structure, the open end at pull rod 3 is covered to point explosion pipe 1, the inside of pull rod 3 is high-pressure buffer 7, space between pull rod 3 and the shell container 4 is high-pressure expansion district 8, the surface of pull rod 3 is equipped with UNICOM high-pressure buffer 7 and high-pressure expansion district 8's through-hole 31, on the contact surface between base 2 and the shell container 4, be equipped with an O shape circle 9 on the contact surface between pull rod 3 and the shell container 4 respectively. The surfaces of the base 2 and the pull rod 3 are provided with mounting grooves, and the O-shaped ring 9 is arranged in the mounting grooves.

The utility model discloses in, shell container 4 is equipped with binding off structure 6, and binding off structure 6 card is at the spacing inslot on 2 surfaces of base, and binding off structure 6 fixes the portable body in shell container 4.

Referring to fig. 2, the open end of the pull rod 3 is trumpet-shaped, the end of the open end is provided with a fixing flange 32, the fixing flange 32 is fixed in the flanging structure 5, and the end face of the fixing flange 32 is abutted against the detonation tube 1. The through hole 31 is provided on the slope of the open end.

The base 2 is close to the inside igniter tube mounting hole that is equipped with of one end of turn-ups structure 5, and igniter tube 1 is fixed in the igniter tube mounting hole. The structure of the igniter tube mounting hole is matched with the appearance of the igniter tube 1. The base 2 is constructed such that the squib 1 is stably seated in the base 2 and the base 2 has a diameter as small as possible, thereby minimizing the diameter of the entire cork puller.

Referring to fig. 3, when the squib 1 is ignited, the generated high-temperature and high-pressure gas first forms a high-temperature and high-pressure environment in the high-pressure buffer 7. The high temperature and high pressure environment in the high pressure buffer zone 7 is then transferred to the high pressure expansion zone 8 through the through hole 31 on the slope of the tie rod 3. The thrust generated by the pressure in the high pressure expansion zone 8 will exceed the confinement of the housing vessel 4 to the movable body and push it to the left. The two O-shaped rings can ensure that the bolt puller has better sealing performance, thereby ensuring that flame cannot be sprayed out from the two ends of the bolt puller.

Referring to fig. 4-7, the utility model discloses assemble according to following several steps: 1) assembly of the movable body: the detonating tube 1 and the pull rod 3 can be fixed on the base 2 at the same time by closing up the primary flanging structure 5; 2) installing an O-shaped ring 9 for sealing, and sealing gas generated by the combustion of gunpowder in the detonation tube 1 in the interior of the bolt puller by installing two O-shaped rings 9 so as to ensure that enough pressure is generated and the pull rod 3 is pushed to the left along with the movable body; because the gas of the gunpowder combustion is limited in the bolt puller, no flame is ejected from the two ends of the bolt puller; 3) during the insertion of the movable body into the housing container 4, the two O-rings 9 are deformed by compression, so as to achieve the seal between the movable body and the housing container 4; 4) the movable body is fixed in the housing container 4 by the closing-in structure 6. The recess 41 formed by the closing-in of the housing container 4 defines the maximum position of the movable body moving to the left, and this recess 41 can also be used to fix the toggle actuator on the airbag module mounting box bottom panel.

To sum up, the utility model discloses there is the characteristics of using spare part few, the equipment of being convenient for. The igniter tube 1 and the pull rod 3 can be fixed on the metal base 2 at the same time through one-time flanging processing, so that a movable body structure with simple and reasonable structure is formed. The hollow draw bar 3 is constructed to function as a high pressure buffer zone, so that the inner space of the bolt puller is fully utilized, which is advantageous for shortening the length of the bolt puller. The two O-rings 9 are arranged reasonably to provide a reliable seal between the movable body and the housing container 4, so that sufficient pressure can be maintained to push the movable body to the left and to prevent flames from being ejected from the front and rear of the plug puller. In order to fix the movable body in the housing container 4, a recess 41 is formed in the housing container 4 by the closing-in structure 6. By this recess 41 the maximum position of the movable body to the left is defined. This recess 41 can also be used to fix the toggle fastener to the airbag module mounting box bottom panel. In a word, the utility model has the characteristics of simple structure, equipment step are few, can realize the miniaturization and the low price of product.

Claims

1. A bolt puller comprises a movable body and a shell container, wherein the movable body is inserted into the shell container (4), and the movable body is connected with the shell container (4) in a sliding manner, and the bolt puller is characterized in that: the movable body comprises an igniter tube (1), a base (2), a pull rod (3) and the pull rod (3), the detonation tube (1) is fixed on the base (2) by adopting a flanging structure (5), the pull rod (3) is of a hollow structure with one end open and the other end closed, the detonation tube (1) covers the open end of the pull rod (3), the inside of the pull rod (3) is a high-pressure buffer area (7), a gap between the pull rod (3) and the shell container (4) is a high-pressure expansion area (8), the surface of the pull rod (3) is provided with a through hole (31) for communicating the high-pressure buffer area (7) with the high-pressure expansion area (8), the contact surface between the base (2) and the shell container (4) is provided with an O-shaped ring (9) respectively, the shell container (4) is provided with a closing structure (6), and the closing structure (6) is clamped in a limit groove on the surface of the base (2).

2. A cork puller according to claim 1, characterized in that: the closing-in structure (6) forms a groove (41) on the surface of the shell container (4), and the shell container (4) is fixed on a bottom panel of the airbag module mounting box by adopting the groove (41).

3. A cork puller according to claim 1, characterized in that: the open end of the pull rod (3) is horn-shaped, the end part of the open end is provided with a fixed flange (32), the fixed flange (32) is fixed in the flanging structure (5), and the end face of the fixed flange (32) is propped against the detonation tube (1).

4. A cork puller according to claim 3, characterized in that: the through hole (31) is arranged on the inclined plane of the opening end.

5. A cork puller according to claim 1, characterized in that: the surface of the base (2) and the surface of the pull rod (3) are provided with mounting grooves, and the O-shaped rings (9) are arranged in the mounting grooves.

6. A cork puller according to claim 1, characterized in that: the base (2) be close to the inside igniter tube mounting hole that is equipped with of one end of turn-ups structure (5), igniter tube (1) is fixed in the igniter tube mounting hole.

7. A cork puller according to claim 6, characterized in that: the structure of the igniter tube mounting hole is matched with the appearance of the igniter tube (1).