CN102837664A - Retractor for safety belt and safety belt assembly - Google Patents
Retractor for safety belt and safety belt assembly Download PDFInfo
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- CN102837664A CN102837664A CN201210309066XA CN201210309066A CN102837664A CN 102837664 A CN102837664 A CN 102837664A CN 201210309066X A CN201210309066X A CN 201210309066XA CN 201210309066 A CN201210309066 A CN 201210309066A CN 102837664 A CN102837664 A CN 102837664A
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Abstract
The invention provides a retractor for a safety belt. A retractor frame comprises two opposite side walls, and corresponding positions of the two opposite side walls are provided with round holes with inner tooth sections. The tooth sections are arranged at a position corresponding to the outward traction direction of a braided belt. A retraction shaft comprises a core shaft which is provided with a though hole along the central axis and is used for winding the braided belt, and two separating end covers which are respectively installed at two ends of the core shaft. The periphery of each end cover is provided with outer teeth matched with inner teeth on the frame. A torsion bar is bar-shaped, the axial middle of the torsion bar is provided with a middle section of outer teeth, and the inner teeth matched with the outer teeth are installed in the though hole of the core shaft. Connection between the torsion bar and the two separating end covers at two ends is achieved at a crossing position between the torsion bar and the two separating end covers through a gear installed at the crossing position and gears correspondingly installed at the end covers. The retractor for the safety belt overcomes the shortcoming that the position of the locking of a retractor is unfixed, and improvement of control accuracy of the retractor is benefited. The invention further provides a safety belt assembly.
Description
Technical Field
The invention relates to a safety belt technology, in particular to a retractor for a safety belt. The invention also relates to a safety belt assembly using the retractor.
Background
Safety belts are important passive safety components for automotive applications. When the vehicle is in collision, the safety belt can protect a user and prevent or reduce secondary injury during collision.
A standard three-point harness originally designed for use in a car seat includes only a latch mechanism and webbing for securing a user (human body). When the vehicle is collided, the locking mechanism is locked, the mesh belt is not stretched outwards any more, and therefore a user is bound on the automobile seat. However, since the speed changes rapidly at the moment of impact, the momentum change time caused by the speed change at the time of impact is short, so that the force of the webbing on the user is large, for example, up to 8-10 kN. Can lead to even more severe injury by breaking the ribs of the user.
Based on the reasons, the standard safety belt is further improved, and a force limiting type safety belt is provided, namely at the moment of collision, the force of the woven belt acting on a human body can be limited through a certain force limiting mechanism, so that the human body cannot be injured by the woven belt, and the purpose of protecting a user to the maximum extent is achieved.
European patent document EP1607288B1 discloses a safety device for a force-limiting safety belt. Specifically, in the second embodiment of the european patent document, the safety device is disclosed to include a U-shaped frame, a spool, and a torsion bar. And circular holes with internal teeth are formed in two opposite side walls of the U-shaped frame. The reel comprises a mandrel for winding the braid and separate end covers arranged at two ends of the mandrel. The end cover is provided with external teeth matched with the internal teeth on the frame; when not bumping, the spool is rotatable float set up in on the U type frame, and both end covers set up respectively in the circular port of U type frame, under normal condition, the external tooth on the end cover with the internal tooth of circular port is not meshed, and the spool can rotate in the circular port to the winding meshbelt or release meshbelt.
The torsion bar is in a rod shape, is arranged in the reel along the axis of the reel and is connected with the reel in a way of meshing the inner teeth and the outer teeth at the central position of the reel along the axis; in addition, two ends of the torsion bar penetrate through the centers of the two end covers, extend out of the end covers and are meshed with the inner teeth on the two end covers through outer teeth.
The working process of the force limiting type mounting device is as follows: in the event of a collision, the sensing element triggers an actuating mechanism comprising a gas generator, the reel is pushed from a floating position to an engaging position, external teeth on an end cover of the reel are engaged with internal teeth of the U-shaped frame, and the reel is changed from a rotatable floating state (also called a free state) to a locking state. So that the webbing wound on the spool is no longer released outwardly. Thereby securing the user to the seat. In the process, the greater the force to which the webbing is subjected from the forward movement of the user due to inertia, the force always trying to pull the spool of the spool into rotation. The spindle is fixed to the U-shaped frame by a torsion bar engaged therewith and an end cap engaged with the torsion bar so as not to rotate. When the traction force of meshbelt is enough big can make the torsion bar produce the distortion and rotate, the rotation of certain angle will take place for the dabber to make the meshbelt can be released one section length, and then make the user can produce certain displacement forward, alleviate the meshbelt and act on the pulling force on the user, reached the effect of restriction meshbelt action on the user's power on one's body, obtain the limit power effect.
The important characteristic of above-mentioned patent lies in that the torsion bar both ends are fixed, and the middle section is through inside and outside tooth meshing dabber for torsional deformation evenly distributed prevents local stress concentration and fracture on whole torsion bar, and can make full use of the material of torsion bar, produces stable unanimous limit force effect. In addition, the torsion bar has symmetrical deformation process, so that the retractor frame is stressed in balance, and the torsional deformation of the frame is small.
For details of the force-limiting type mounting device of the above patent document, reference is further made to the above european patent document.
However, the force-limiting safety device disclosed in the above-mentioned european patent also has certain drawbacks, and the main problem is that it is locked by the engagement of the circumferential external teeth on the end cap of the reel and the circumferential internal teeth provided on the frame wall of the U-shaped frame, and the locking position is not fixed and may occur at a plurality of positions in the circumferential direction; this causes uncertainty in locking of the retractor, and makes accurate control difficult. There is also room for improvement.
Disclosure of Invention
The present invention provides a retractor for a seat belt to solve the above-mentioned problems of the conventional seat belt retractor. The invention further provides a seat belt assembly using the retractor.
The invention provides a retractor for a seat belt, comprising: a retractor frame, a spool and a torsion bar; wherein,
the retractor frame comprises two opposite side walls; circular holes with internal tooth sections are arranged at the corresponding positions of the two side walls; the tooth section is arranged at a position corresponding to the outward traction direction of the mesh belt;
the scroll comprises a mandrel and two separate end covers, wherein the mandrel is provided with a mandrel through hole along the central axis and is used for winding a braid; outer teeth matched with the inner teeth on the frame are arranged along the periphery of the end cover;
the torsion bar is in a rod shape, is arranged in the mandrel through hole along the axis of the reel, and has two end parts at least extending to the end covers at two sides of the mandrel; the torsion bar is provided with middle-section external teeth in the middle part in the axial direction, internal teeth correspondingly meshed with the external teeth are arranged in the through hole of the mandrel, and the torsion bar is connected with the mandrel through the external teeth and the internal teeth; the torsion bar and the two end covers are crossed, and the connection of the torsion bar and the two separate end covers at the two ends is realized through the gear arranged at the position and the gears correspondingly arranged on the end covers;
in a free state, the reel is rotatably and floatingly arranged in the retractor frame, and two end covers are arranged in circular holes on two side walls of the retractor frame; when the reel is locked, the external teeth of the two end covers of the reel are meshed with the internal teeth on the frame.
Preferably, the torsion bar is connected with the separate end covers at two ends by adopting the following structure: a central concave hole with internal teeth is formed in the center of the end surface of the inner side surface of the end cover, which faces the mandrel; the end of the torsion bar matched with the end cover is inserted into the central concave hole of the end cover, the end of the torsion bar is provided with external teeth at the end part, and internal teeth are arranged in the central concave hole of the inner end surface of the end cover and are meshed with each other.
Preferably, the outer teeth of the middle section of the middle part of the torsion bar are provided with avoidance tooth notches corresponding to the fixing grooves which penetrate through the mandrel and fix the end part of the safety belt braid; an anti-dislocation tooth notch is arranged at the position, corresponding to the avoidance tooth notch, of the external tooth at the end part arranged at one end part of the anti-dislocation tooth in the circumferential direction; correspondingly, on the end cover that corresponds with this torsion bar tip that sets up mistake proofing tooth and lack, on the internal tooth of the central shrinkage pool of its medial surface, set up with mistake proofing tooth lacks matched with breach structure.
Preferably, the external tooth profile of the torsion bar in the middle part is inclined to the end part provided with the mistake-proofing notch.
Preferably, the torsion bar is of a two-piece structure separated from an axial middle portion; the middle section outer teeth are positioned at the two sections of butted end parts.
Preferably, the two sections of the torsion beam have different diameters and/or different materials, respectively.
Preferably, the circumferential external teeth of the butt end parts of the two sections of the torsion bar are provided with avoidance missing teeth, and the two avoidance missing teeth are in the same position and correspond to the fixing grooves which penetrate through the mandrel and fix the end parts of the mesh belt together.
Preferably, at least two force limiting pins are arranged on each side of the mandrel; the force limiting pin is fixed on the end face of the mandrel and inserted into a pin hole arranged on the end cover corresponding to the position of the force limiting pin, or the force limiting pin is fixed on the end cover and inserted into a pin hole arranged on the end face of the mandrel corresponding to the position of the force limiting pin.
Preferably, the two force limiting pins at the two ends of the mandrel are arranged at circumferentially staggered fixed angles.
Preferably, the end surfaces of the mandrel, which are adjacent to the end covers, are provided with rabbets which are matched with each other, and the rabbets are provided with antifriction rings.
Preferably, an annular boss is arranged on the outer edge of one side, facing the mandrel, of each end cover, and avoidance rabbets are arranged at the corresponding positions of the two end faces of the mandrel and the annular boss.
Preferably, in the two end covers, an outer end face of one end cover is provided with an extending shaft matched with the coil spring, and an outer end face of the other end cover is provided with an extending shaft matched with the sensing element.
The invention also provides a safety belt assembly, which uses the retractor of any one technical scheme.
Compared with the prior art, the safety belt retractor provided by the invention has the following advantages:
the retractor of the invention arranges the inner tooth section in the through hole of the frame instead of arranging the teeth in a whole circle. The position of the inner tooth section is arranged at the position corresponding to the outward traction direction of the mesh belt; and the locking position of the retractor is fixed at the position where the inner tooth section is arranged by the position setting inner tooth section. The problem of the coiler locking position among the background art unsettled has been overcome, is favorable to improving the accuracy to coiler control to can improve the stability that contains the safety belt use with this coiler.
In a preferred embodiment of the present invention, both ends of the torsion bar of the retractor are disposed at both end covers of the spool without penetrating the end covers, and the length of the torsion bar is shortened relative to the torsion bar in the background art; the portion that protrudes outside in the related art is replaced with a protruding shaft that is provided outside the end cover in the seatbelt retractor. When collision occurs, the braid drives the mandrel to rotate and drives the torsion bar to rotate through the internal teeth of the middle section; the end caps are locked to the frame and engage both ends of the torsion bar so that the torsion bar cannot rotate. At this time, the torsion bar bears the rapidly increasing torsion force, and when the torsion force is large enough, the torsion bar can be twisted and deformed, so that the mandrel can rotate at a certain angle, part of the woven belt is released, and the force of the woven belt on the body of a user of the safety belt is reduced. The length of the torsion bar adopted by the invention is shorter than that in the background technology, and the torsion bar does not extend out of the end covers along the axial direction, so that the torsion bar is not easy to bend and deform, and is not restrained by other parts except the end covers at two sides, the whole stress condition of the torsion bar is simplified, and the use process is safer and more stable. The torsion bar is not easy to bend and deform, and the relative angle between the core shaft and the end cover can be maintained without causing local metal friction and gluing between the core shaft and the end cover. In addition, because the material of the torsion bar needs to meet special torsion requirements, the cost is high, the manufacturing requirement is high, and the short torsion bar can save the cost.
In another preferred technical scheme of the invention, compared with the background art, the structure that the lug boss is inserted into the corresponding seam allowance of the mandrel is arranged on the inner side of the separated end cover, so that the structure can bear the traction force of the braid and transmit the traction force to the frame, and the torsion bar can be further prevented from bending and deforming when bearing the traction force of the braid; the boss of this safety belt coiler's both sides end cover and the tang setting at dabber both ends, transmit meshbelt traction force to the frame on, guarantee that the torsion bar only bears the reaction moment who comes from the torsion moment of dabber and end cover, the atress situation is simple and controllable, can obtain more unanimous limit for force effect, more safety and stability in the use.
In another preferred technical scheme of the invention, a force limiting pin is further arranged between the mandrel and the end cover of the retractor, and the force limiting pin breaks when the tensile force borne by the mandrel is greater than a preset value. Before the fracture, the core shaft transmits torsion to the end cover through the force limiting pin; after the force limiting pin is broken, the torsion bar transmits torsion to the end cover. Because the force limiting value of the force limiting pin which is broken is more constant, the structure can obtain stable force limiting effect.
In another preferred technical scheme of the invention, the torsion bar of the retractor is divided into two coaxial sections; the two torsion bar sections with the same diameter or different diameters are combined for use, and a plurality of torsion values can be combined, so that a retractor with a plurality of limit values can be formed, and different requirements of different automobile manufacturers on the limit values of the safety belt can be met; in addition, because the torsion bar is made of special materials and processed by a cold heading process, a separate die is required for each diameter of the torsion bar, and the manufacturing equipment and the die are very expensive; by adopting the two-section type torsion bar, the torsion bar sections processed by using fewer processing dies can be realized, and a plurality of required limit values can be obtained in a combined mode, so that the die sinking quantity can be reduced, and the manufacturing cost can be saved.
Drawings
Fig. 1 is a schematic structural view of a first embodiment of a retractor for a seatbelt of the present invention;
FIG. 2 is a schematic view of the reel of FIG. 1;
FIG. 3 is a cross-sectional view of FIG. 2 taken along the axial direction of the spool;
FIG. 4 is an exploded view of the spool assembly and torsion bar assembly;
fig. 5 is a schematic view of a torsion bar in the retractor according to the first embodiment of the present invention;
FIG. 6 shows an end profile of the left end of the torsion bar of FIG. 5;
FIG. 7 is a fitting view showing the left end portion of the torsion beam inserted into the recessed hole of the left end cap;
FIG. 8 is an end profile of the right end of the torsion bar shown in FIG. 5;
FIG. 9 is a view showing a state where the right end of the torsion bar is inserted into the recess hole of the right end cap
FIG. 10 is a schematic view of a torsion bar with a central external tooth having a notched opening inserted into a mandrel with the external tooth fitting in a through hole of the mandrel;
fig. 11 and 12 show a perspective view and a sectional view of the torsion beam, respectively;
FIG. 13 is an exploded view of the assembly of the spool member and the torsion bar in a second embodiment of the present invention;
FIG. 14 is a cross-sectional view of a second embodiment of the present invention showing a two-piece torsion bar of the same diameter assembled with other components of the spool;
fig. 15 is a cross-sectional view of a two-piece torsion bar of a second embodiment of the present invention when the two-piece torsion bar is not assembled with other spool components at the same time.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather construed as limited to the embodiments set forth herein.
First embodiment
Fig. 1 is a schematic structural view of a first embodiment of a retractor for a seat belt of the present invention, and fig. 2 is a schematic structural view of a spool in fig. 1; FIG. 3 is a cross-sectional view of FIG. 2 taken along the axial direction of the spool; fig. 4 is an exploded view of the spool and torsion bar assembly.
Referring to fig. 1, in the present embodiment, the retractor includes a retractor frame 1, a reel 2, and a torsion bar 3 (shown in fig. 4)
Wherein, coiler frame 1 is the U type, and it includes two relative lateral walls: a first side wall 1-1 and a second side wall 1-2. And two third walls 1-4 connecting the first side wall 1-1 and the second side wall 1-2. A first circular through hole 1-1a and a second circular through hole 1-2a are respectively arranged at corresponding positions on the first side wall 1-1 and the second side wall 1-2, and an internal tooth section 1-3 is arranged at the same position on the two through holes (fig. 1 only shows that the internal tooth section is arranged on the second through hole 1-2 a). The inner tooth sections 1-3 are used for being matched with the outer teeth on the reel to lock the reel, so that the arrangement positions of the inner tooth sections 1-3 correspond to the traction direction of the woven belt wound on the reel. In the frame shown in said fig. 1, the webbing is led out from the top of the inside of said third wall 1-4, so that said inner tooth segments 1-3 are arranged at the top of both through holes. And the locking position of the retractor is fixed at the position where the inner tooth section is arranged by the position setting inner tooth section. The problem of the coiler locking position among the background art unsettled has been overcome, is favorable to improving the accuracy to coiler control to can improve the stability that contains the safety belt use with this coiler.
Other structures, such as lightening holes on the two side walls, interfaces of reinforcing ribs connecting the two side walls, and the like, are also arranged on the frame 1, and are not described in detail herein.
Referring to fig. 2, 3 and 4, the reel 2 includes a mandrel 2-1 and end caps detachably disposed at both ends of the mandrel 2-1: a left end cap 2-2a and a right end cap 2-2 b. The spindle 2-1 is used for winding a webbing belt, and it can be rotated along its axis to wind a webbing belt thereon or to release the wound webbing belt. The mandrel is provided with a through hole 2-3 along the axis, and the inner wall of the through hole 2-3 is provided with inner teeth.
Two pin columns 2-6 which extend outwards are respectively arranged on two end faces of the mandrel 2-1 and are called force limiting pins 2-6.
And a flat and long fixing groove 2-4 for penetrating and fixing the end part of the braid and a lightening groove 2-5 for lightening weight are also arranged on the mandrel 2-1.
The periphery of the two end covers is provided with external teeth, as shown in fig. 4, the periphery of the left end cover 2-2a is provided with external teeth 2-2a-1, the periphery of the right end cover 2-2b is provided with an external gear ring 2-2b-1, the teeth on the two end covers are all one-way teeth, the rotation direction of the mandrel 2-1 is towards the release direction of the woven tape, and the external teeth on the periphery of the two end covers are matched with the internal gear segments of the two through holes on the frame 1.
And pin holes are also arranged on the end surfaces of the two end covers facing the mandrel 2-1 at positions corresponding to the force limiting pins, such as the pin holes 2-2b-2 on the right end cover 2-2b shown in figure 4. When both end caps are provided on both end faces of the core shaft 2-1 in the manner shown in fig. 2, force-limiting pins are inserted into the corresponding pin holes. In addition, the force limiting pin can be arranged on the inner side of the end cover, and a pin hole is arranged at the corresponding position of the end face of the mandrel 2-1. The main function of the force limiting pin 2-6 is to withstand the shear forces during rotation of the spindle and to break when the shear forces reach a threshold value, so that the torsion bar 3 is only active when the restraining force is greater than a fixed value. The force limiting pins can be arranged at different positions at two ends of the mandrel, so that the force limiting pins can be used for positioning when the end covers are assembled with the mandrel 2-1, and assembly errors of the left end cover and the right end cover are prevented. The position of above-mentioned force limiting pin can also make the assembly back, and the external tooth of both ends end cover staggers certain angle in circumference to the meshing of the circular port internal tooth that makes both sides end cover and frame lateral wall more accords with the operating condition in the rolling device has certain crooked condition, makes both ends end cover all effectively mesh with the frame.
The end face centers of the two end covers facing the mandrel 2-1 are also provided with central concave holes (hereinafter referred to as concave holes) with internal teeth, such as concave holes 2-2b-3 on the right end cover 2-2b shown in fig. 4. In this embodiment, the concave holes of the two end caps are disposed on the bosses extending out of the side of the end faces where the concave holes are located. The corresponding end surface of the mandrel is provided with a spigot for accommodating the boss.
And an outward extending shaft extending outwards is arranged along the center of the outer end faces (namely the end faces far away from the mandrel 2-1) of the two end covers. A right side protruding shaft 2-2b-5 as shown in fig. 1 and a left side protruding shaft 2-2a-5 as shown in fig. 4. Wherein, the left side projecting shaft 2-2a-5 is connected with the sensing element, and the periphery of the right side projecting shaft 2-2b-5 is provided with teeth which are connected with the coil spring.
In this embodiment, the retractor further includes a torsion bar 3 as shown in fig. 4, the torsion bar 3 is in a bar shape, and outer teeth, referred to as end outer teeth and middle outer teeth, are provided at both ends and a middle portion thereof in a circumferential direction.
The torsion bar 3 and the reel 2 are structurally shown in figures 2, 3 and 4, the torsion bar 3 is inserted into and penetrates through a mandrel through hole 2-3 of the mandrel 2-1, and the external teeth at the middle part of the axial direction of the torsion bar 3 are meshed with the internal teeth arranged on the inner wall of the mandrel through hole 2-3 of the mandrel 2-1. The left end cover 2-2a and the right end cover 2-2b respectively cover the two end parts of the mandrel 2-1 from the left side and the right side, and force limiting pins at corresponding positions correspond to the pin holes. The two ends of the torsion bar 3 are respectively inserted into the concave holes of the left end cover and the right end cover, and the external teeth of the end parts of the torsion bar are meshed with the internal teeth of the corresponding concave holes. In this embodiment, as shown in fig. 4, a wear-reducing ring 4b is further disposed between the bosses of the two end caps and the spigot of the mandrel 2-1. The friction reducing ring 4b is generally made of low-friction plastic and can provide transition for the matched spigot position between the opposite end surfaces of the end cover 2-2 and the mandrel 2-1, so that metal surfaces at the spigot position cannot be in direct contact, and the influence of the gluing effect caused by mutual friction of the metal surfaces on the normal work of the torsion bar is avoided.
As shown in fig. 4, an annular boss (an annular boss 2-2b-6 on the right-side end cover shown in fig. 4) is arranged on the outer edge of the inner side of the end cover, and an avoiding spigot matched with the annular boss is arranged at the corresponding position of the end surface of the mandrel 2-1; through the arrangement of the annular boss and the avoidance spigot structure, the friction area of the end face of the mandrel 2-1 and the end cover during relative rotation can be reduced, so that the friction force between the mandrel and the end cover is reduced, and the stability of the force limiting effect is improved.
The reel 2 is integrally arranged in the frame 1, and two end covers on the reel 2 are respectively arranged in through holes on the side wall of the frame 1. In a free state, the scroll 2 is rotatably and floatingly arranged in the retractor frame 1, and external teeth on an end cover of the scroll are not in contact with internal teeth of a through hole in the retractor frame 1. The reel 2 is supported by the extending shafts outside the two ends of the end cover, and can rotate freely, so that the winding and the releasing of the mesh belt are realized. When the reel 2 is locked, the outer teeth of the two end covers of the reel are meshed with the inner teeth of the corresponding positions on the frame 1, and the rotation of the reel 2 is hindered.
In the retractor of the present embodiment, the two ends of the torsion bar 3 are disposed at the two end covers of the spool without penetrating the end covers, and the length of the torsion bar is shortened compared to the torsion bar in the related art. The shortened portion is replaced by a protruding shaft disposed outside the end cap. In the event of a collision, the end caps are locked to the frame and engage both ends of the torsion bar so that both ends of the torsion bar cannot rotate. The middle part of the torsion bar 3 is meshed with the internal teeth of the mandrel 2-1 through the circumferential external teeth at the middle part, and the pulling force of the braid is loaded on the torsion bar 3 through the meshing relation; when the pulling force of the woven belt reaches a certain degree, the torsion bar 3 is twisted and deformed, so that the mandrel 2-1 rotates at a certain angle to release part of the woven belt, the twisted and deformed characteristic of the torsion bar 3 can properly release the woven belt, the binding force of the woven belt on a human body is controlled at a preset value, and the damage of an overlarge binding force on the human body is avoided; meanwhile, the woven belt can not be released for too long distance to cause failure of binding to the human body.
In the embodiment, because the length of the torsion bar is shortened, and the boss at the inner side of the end cover and the spigot of the mandrel are arranged, the torsion bar only bears the acting force from the mandrel and the reaction force of the end cover, and the torsion bar is prevented from directly bearing the traction force of the braid, the stress condition of the torsion bar is simple and controllable, a force limiting pin meeting the force limiting requirement can be designed according to the requirement, and the torsion bar is safe and stable in the use process. In addition, the middle section of the torsion bar is twisted, so that deformation which is uniformly distributed is easier to generate, and fracture failure caused by overhigh local stress is avoided; meanwhile, the left side and the right side bear half of the force limiting value respectively, and the diameter required by the torsion bar can be reduced. Because the material of the torsion bar needs to meet special torsion requirements, the cost is high, the manufacturing requirement is high, and the cost can be obviously saved by adopting the short torsion bar in the embodiment.
In addition, in the above embodiment of the invention, the inner tooth segments 1-3 are arranged on the through hole of the retractor frame, and the positions of the inner tooth segments 1-3 correspond to the traction direction of the mesh belt wound on the winding shaft. Compared with a structure that the through holes are provided with the internal teeth in a whole circle, the structure of the embodiment can ensure that the reel is locked at a certain position, namely the position where the internal tooth sections 1-3 are arranged, when the reel is locked.
Secondly, in the embodiment of the invention, the force limiting pins 2-6 arranged at the two ends of the core shaft of the reel 2 are as described above, when the reel 2 is in a locked state, the core shaft 2-1 generates a rotation tendency relative to the end covers at the two sides due to the pulling force from the seat belt webbing, and the force limiting pins 2-6 firstly prevent the core shaft from rotating and bear the shearing force between the end covers and the core shaft 2-1. In the collision, the traction force of the mesh belt is subjected to a traction force loading process from small to large rapidly. In the process, when the traction force is smaller than the bearing threshold value of the force limiting pins 2-6, the traction force borne by the mandrel 2-1 is loaded on the force limiting pins 2-6, and the torsion bar 3 does not bear or mainly bears the traction force; when the traction force value is increased to exceed the bearing threshold value of the force limiting pin 2-6, the force limiting pin 2-6 is broken, the torsion bar 3 begins to completely bear the traction force of the braid transmitted by the mandrel 2-1, and then the torsion bar 3 is twisted and deformed. The force limiting pin 2-6 can adjust the force limiting threshold of the safety belt.
In the embodiment, the outer teeth at the middle part of the torsion bar 3 are provided with tooth notches, which are called avoidance tooth notches; such as the relief tooth segment 3-1-1 shown in fig. 11. FIG. 10 is a schematic diagram of a torsion bar with an outer tooth section 3-1-1 having an avoidance tooth segment at the middle part inserted into a mandrel 2-1, and the outer tooth section of the torsion bar is matched with a through hole of the mandrel. As can be seen from FIG. 10, the position of the avoidance tooth segment 3-1-1 on the torsion bar 3 is such that after the torsion bar 3 is inserted into the through hole of the spindle 2-1, the avoidance tooth segment 3-1-1 is aligned or approximately aligned with the fixing groove 2-4 on the spindle 2-1 for passing and fixing the webbing 6. The fixing groove 2-4 is a flat-long through hole which is arranged to meet the requirement that the braid passing direction is perpendicular to the central shaft of the mandrel 2-1 and needs to be as close to the central shaft as possible. The avoiding tooth gap 3-1-1 provides an avoiding space for the braid 6 to penetrate through the fixing groove 2-4, so that the braid 6 is prevented from interfering with the tooth due to the tooth arranged at the position, the braid 6 is far away from the central line of the mandrel 2-1 at the position, and the stability of the mandrel 2-1 when the braid 6 is tensioned is not facilitated. In the embodiment of the present invention, the torsion bar 3 is further provided with an anti-dislocation tooth. As shown in fig. 5, the torsion beam 3 is provided with an anti-backlash notch 3-2b-1 at one end (the right side in the present embodiment) and is not required to be provided with the notch at the other end. Correspondingly, the concave hole on the end cover of the reel at the end needs to be provided with a matched structure. As shown in fig. 4, a corresponding error-proofing opening 2-2b-4 is provided in the recess 2-2b-3 of the end cap 2-2 b. The reason why the above-mentioned anti-rattle teeth 3-2b-1 are provided is that the torsion bar 3 must be inserted into the through hole 2-3 of the core shaft at an appropriate angle due to the presence of the above-mentioned anti-rattle teeth 3-1-1, and the anti-rattle teeth 3-2b-1 can ensure one-time success of the operation of inserting the torsion bar 3 at the time of assembly.
FIG. 6 shows the end profile of the left end portion 3-2a of the torsion beam 3 shown in FIG. 5, and FIG. 7 shows a fitting view of the left end portion 3-2a of the torsion beam 3 inserted into the recessed hole of the left end cap 2-2 a; fig. 8 is a tooth profile of the end portion of the right end portion 3-2b of the torsion beam 3 shown in fig. 5, in which the error-proof notch 3-2b-1 provided in the end portion is seen, and fig. 9 is a fitting view showing that the right end portion 3-2b of the torsion beam 3 is inserted into the concave hole of the right end cap 2-2 b.
The right end of the torsion bar 3 is provided with the mistake-proofing gap 3-2b-1, so that the tooth numbers of the left end and the right end are different, and the torsion forces borne by the two ends are not the same when the torsion bar 3 is twisted. For this reason, the present invention solves the problem in the following manner.
The outer teeth 3-1 at the middle part of the torsion bar 3 are inclined towards the right end 3-2b (namely the end part provided with the mistake-proof notch), so that the circumferential outer teeth at the middle part of the torsion bar 3 face one end provided with the mistake-proof notch 3-1 and integrally deviate. Fig. 11 and 12 show a perspective view and a sectional view of the torsion beam 3, respectively, and the inclination of the teeth 3-1-2 can be seen from fig. 11 and 12. By arranging the outer teeth 3-1 to incline towards the right, the force applied to the torsion bar 3 by the mandrel 2-1 is balanced, and the whole force is balanced.
In the first embodiment, the torsion bar is not extended out of the end caps on both sides of the core shaft in the axial direction. It will be appreciated by those skilled in the art that the torsion bar in the retractor described in the background of the application can also be used with a through hole centrally provided in the respective end cap. And will not be discussed further herein.
Second embodiment
The retractor in this embodiment is different from the first embodiment in that the torsion bar has a two-stage structure, and fig. 13 shows an exploded view of the assembly of the spool part and the torsion bar.
The torsion bar comprises two sections which are coaxially arranged: a first section 3a and a second section 3 b. The two sections have the same axial length, and outer teeth are arranged at the end part of each section along the axial direction. When the two sections of torsion bars are combined into a whole, two ends of the two sections of torsion bars are butted together, the end surfaces are butted, and external teeth at the opposite ends are corresponding without staggered teeth. The outer teeth at the opposite ends correspond to the circumferential outer teeth at the middle portion of the torsion bar as a whole in the first embodiment. The function and the connection with the mandrel are the same as in the first embodiment described above. The other two ends of the two sections of torsion bars are respectively inserted into the concave holes of the end covers of the winding shaft, and the connection mode is the same as that described in the first embodiment, and the description is omitted here. In addition, the external teeth at the butt joint end parts of the two sections of torsion bars are provided with avoidance tooth notches, and the two avoidance tooth notches are identical in position and correspond to the fixing grooves which are formed in the core shaft and penetrate through and fix the end parts of the mesh belts together. The avoidance tooth segment has the same function as the avoidance tooth segment of the outer tooth of the middle part of the torsion bar in the first embodiment, and the avoidance tooth segment is not described again. The other parts of the present embodiment except the torsion beam are the same as those of the first embodiment described above.
Providing the torsion bar as two separate segments has the following effects: can use the torsion bar section combination of two the same diameters or different diameters, can make up out a plurality of limit values to can adopt less torsion bar to form the coiler that has a plurality of limit values, satisfy different automobile manufacturer to the different requirements of safety belt limit value. Fig. 14 and 15 show schematic views of the same diameter torsion bar section and different diameter torsion bar section groups as torsion bars, respectively. In addition, torsion bars of the same material or different materials can be used in combination, and different force limiting effects can be obtained similarly.
In addition, since the torsion bar is made of a special material and is manufactured through a cold heading process, a separate mold is required for each diameter of the torsion bar, and manufacturing equipment and molds thereof are expensive. By adopting the two-section type torsion bar of the embodiment, the torsion bar with a plurality of limit values can be combined by the torsion bar sections processed by the limited processing die, so that the die sinking quantity can be reduced, and the manufacturing cost can be saved. And the torsion bar with a shorter size is more convenient to process, the processing yield is higher, and the cost of each die is relatively lower.
In addition, varying the material of the torsion bar segments and varying the diameter may be used simultaneously to combine more variations. And will not be described in detail herein.
The invention also protects a safety belt assembly which uses the retractor of the embodiment and can obtain the beneficial effects brought by the retractor of the embodiment. The assembly of the retractor with webbing and other related accessories can be referred to the prior art and will not be discussed further herein.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto, and variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (13)
1. A retractor for a seat belt, comprising: a retractor frame, a spool and a torsion bar; wherein,
the retractor frame comprises two opposite side walls; circular holes with internal tooth sections are arranged at the corresponding positions of the two side walls; the tooth section is arranged at a position corresponding to the outward traction direction of the mesh belt;
the scroll comprises a mandrel and two separate end covers, wherein the mandrel is provided with a mandrel through hole along the central axis and is used for winding a braid; outer teeth matched with the inner teeth on the frame are arranged along the periphery of the end cover;
the torsion bar is in a rod shape, is arranged in the mandrel through hole along the axis of the reel, and has two end parts at least extending to the end covers at two sides of the mandrel; the torsion bar is provided with middle-section external teeth in the middle part in the axial direction, internal teeth correspondingly meshed with the external teeth are arranged in the through hole of the mandrel, and the torsion bar is connected with the mandrel through the external teeth and the internal teeth; the torsion bar and the two end covers are crossed, and the connection of the torsion bar and the two separate end covers at the two ends is realized through the gear arranged at the position and the gears correspondingly arranged on the end covers;
in a free state, the reel is rotatably and floatingly arranged in the retractor frame, and two end covers are arranged in circular holes on two side walls of the retractor frame; when the reel is locked, the external teeth of the two end covers of the reel are meshed with the internal teeth on the frame.
2. The retractor for a seatbelt according to claim 1,
the torsion bar is connected with the separated end covers at two ends by adopting the following structure: a central concave hole with internal teeth is formed in the center of the end surface of the inner side surface of the end cover, which faces the mandrel; the end of the torsion bar matched with the end cover is inserted into the central concave hole of the end cover, the end of the torsion bar is provided with external teeth at the end part, and internal teeth are arranged in the central concave hole of the inner end surface of the end cover and are meshed with each other.
3. The retractor for the safety belt as claimed in claim 2, wherein the outer teeth of the middle section of the middle part of the torsion bar are provided with escape tooth notches corresponding to fixing grooves which penetrate through the mandrel and fix the end parts of the safety belt webbing; an anti-dislocation tooth notch is arranged at the position, corresponding to the avoidance tooth notch, of the external tooth at the end part arranged at one end part of the anti-dislocation tooth in the circumferential direction; correspondingly, on the end cover that corresponds with this torsion bar tip that sets up mistake proofing tooth and lack, on the internal tooth of the central shrinkage pool of its medial surface, set up with mistake proofing tooth lacks matched with breach structure.
4. The retractor for a seatbelt according to claim 3, wherein: the outer tooth profile of the torsion bar positioned in the middle part inclines towards the end part provided with the mistake-proofing notch.
5. The retractor for a seatbelt according to claim 1, wherein: the torsion bar is of a two-section structure separated from the axial middle part; the middle section outer teeth are positioned at the two sections of butted end parts.
6. The retractor for a seatbelt according to claim 5, wherein: the two sections of the torsion bar each have a different diameter and/or different material.
7. The retractor for a seatbelt according to claim 5, wherein: avoiding missing teeth are arranged on circumferential external teeth of the butt-jointed end parts of the two sections of the torsion bar, and the two avoiding missing teeth are identical in position and correspond to the fixing groove which penetrates through the mandrel and fixes the end part of the mesh belt.
8. The retractor for a seatbelt according to claim 1, wherein: at least two force limiting pins are arranged on each side of the mandrel; the force limiting pin is fixed on the end face of the mandrel and inserted into a pin hole arranged on the end cover corresponding to the position of the force limiting pin, or the force limiting pin is fixed on the end cover and inserted into a pin hole arranged on the end face of the mandrel corresponding to the position of the force limiting pin.
9. The retractor for a seatbelt according to claim 8, wherein: two force limiting pins at two ends of the mandrel are arranged at circumferentially staggered fixed angles.
10. The retractor for a seatbelt according to claim 1, wherein: the end surfaces of the mandrel and the end cover which are adjacent are provided with rabbets which are matched with each other, and the rabbets are provided with antifriction rings.
11. The retractor for a seatbelt according to claim 1, wherein: and the outer edge of one side of each end cover, which faces the mandrel, is provided with an annular boss, and the two end faces of the mandrel and the corresponding positions of the annular bosses are provided with avoidance rabbets.
12. The retractor for a seatbelt according to claim 1, wherein: and in the two end covers, the outer end face of one end cover is provided with an extending shaft matched with the coil spring, and the outer end face of the other end cover is provided with an extending shaft matched with the sensitive element.
13. A seatbelt assembly, wherein the retractor according to any one of claims 1 to 12 is used.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210309066.XA CN102837664B (en) | 2012-08-27 | 2012-08-27 | A kind of taking-up device for safety strap and safety strap assembly |
| US14/421,457 US9718437B2 (en) | 2012-08-27 | 2013-08-23 | Winder, a torsion bar, a reel, end covers and a safety belt assembly used for a force limiting safety belt |
| EP13833997.3A EP2889191B1 (en) | 2012-08-27 | 2013-08-23 | Retractor for safety belt, torsion bar, spool, end cap and safety belt assembly |
| PCT/CN2013/082175 WO2014032546A1 (en) | 2012-08-27 | 2013-08-23 | Retractor for safety belt, torsion bar, spool, end cap and safety belt assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210309066.XA CN102837664B (en) | 2012-08-27 | 2012-08-27 | A kind of taking-up device for safety strap and safety strap assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102837664A true CN102837664A (en) | 2012-12-26 |
| CN102837664B CN102837664B (en) | 2016-01-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210309066.XA Expired - Fee Related CN102837664B (en) | 2012-08-27 | 2012-08-27 | A kind of taking-up device for safety strap and safety strap assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102837664B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014032546A1 (en) * | 2012-08-27 | 2014-03-06 | 上海和励信息科技有限公司 | Retractor for safety belt, torsion bar, spool, end cap and safety belt assembly |
| CN103832389A (en) * | 2014-02-27 | 2014-06-04 | 上海和励信息科技有限公司 | Retractor frame, retractor frame assembly and safety device |
| CN103832388A (en) * | 2014-02-27 | 2014-06-04 | 上海和励信息科技有限公司 | Drive unit clamping and fixing piece applied to pre-tightening safety device and pre-tightening safety device |
| CN103832392A (en) * | 2014-02-27 | 2014-06-04 | 上海和励信息科技有限公司 | Reel, safety device, transportation equipment and mandrel |
| CN103832396A (en) * | 2014-02-27 | 2014-06-04 | 上海和励信息科技有限公司 | Retractor framework, auxiliary side covers and safety device |
| CN104842929A (en) * | 2015-04-30 | 2015-08-19 | 宜兴市奥华汽配有限公司 | Gear tube component |
| CN111439233A (en) * | 2020-05-25 | 2020-07-24 | 重庆光大产业有限公司 | Limit force increases progressively formula coiler |
| CN112683554A (en) * | 2021-01-28 | 2021-04-20 | 重庆长安汽车股份有限公司 | Device and method for testing dynamic performance of self-locking spring bolt of safety belt |
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| CN112683554A (en) * | 2021-01-28 | 2021-04-20 | 重庆长安汽车股份有限公司 | Device and method for testing dynamic performance of self-locking spring bolt of safety belt |
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Effective date of registration: 20180408 Address after: 12 building, three mansion, No. 137, dry noo Road, Hongkong, China Patentee after: He Li Technology Co.,Ltd. Address before: 201206 room 2202, fangzheng mansion, No. 1122, Xin Jin Qiao Road, Pudong New Area, Shanghai Patentee before: HELIA TECHNOLOGY (SHANGHAI) Co.,Ltd. |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20121226 Assignee: ZHEJIANG SONGYUAN AUTOMOTIVE SAFETY SYSTEMS CO.,LTD. Assignor: He Li Technology Co.,Ltd. Contract record no.: 2018990000336 Denomination of invention: Retractor for safety belt and safety belt assembly Granted publication date: 20160113 License type: Common License Record date: 20181207 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160113 |