CN103963737B - Coiler, end cap, annular gear ring and seat belt assembly for seat belt - Google Patents
Coiler, end cap, annular gear ring and seat belt assembly for seat belt Download PDFInfo
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- CN103963737B CN103963737B CN201310032779.0A CN201310032779A CN103963737B CN 103963737 B CN103963737 B CN 103963737B CN 201310032779 A CN201310032779 A CN 201310032779A CN 103963737 B CN103963737 B CN 103963737B
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- 230000000670 limiting effect Effects 0.000 description 29
- 208000027418 Wounds and injury Diseases 0.000 description 5
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- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
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- Automotive Seat Belt Assembly (AREA)
Abstract
A kind of coiler for seat belt, including: retractor frame, spool and torque arm；Torque arm is shaft-like, and it is arranged among spool through hole, and both ends at least extend to the end cap of mandrel both sides；The external tooth that torque arm is arranged in the middle part of reel axis engages with the internal tooth arranged in the middle part of mandrel, is engaged with this end cap by gear at the crossover location with a wherein end cap；Mutually being screwed by another end cap of internal and external threads and this at the crossover location with another end cap, this another end cap is referred to as the second end cap；The rotatable floating of spool is arranged in described retractor frame in a free state, and in the circular port of the two side that two end cap is placed in retractor frame, between torque arm and the second end cap, internal and external threads does not screws；When locking, the external tooth of spool two end cap is meshed with the internal tooth section on described framework.The coiler of the present invention is applied on seat belt apparatus to realize incrementally limiter.Invention additionally discloses a kind of end cap, annular gear ring and use the seat belt assembly of described coiler.
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 an end cover, an annular gear ring and 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 impact is short, so that the force of the webbing on the user is large, for example, up to 8 to 10 kN. Such large forces can cause the user's ribs to break off and even cause more serious injury.
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; the reel is rotatably and floatingly arranged on the U-shaped frame, and the two end covers are respectively arranged in the circular hole of the U-shaped frame. In a normal state, the external teeth on the end cap are not engaged with the internal teeth of the circular hole, and the spool is rotatable in the circular hole to wind the webbing or release the webbing.
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 device triggers an actuating mechanism including a gas generator, so that external teeth on the end cover of the winding shaft are meshed with internal teeth of the U-shaped frame, and the winding shaft is changed from a rotatable floating state (also called a free state) to a locked 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.
The force-limiting safety device disclosed in the above-mentioned european patent document is a constant force-limiting type, also referred to as a one-stage force-limiting type or a single-stage force-limiting type, and a characteristic curve of a force-limiting value versus time is as shown in fig. 7, and is kept constant after the webbing acting force reaches a certain value. In addition to the constant force limiting safety devices described above, it is sometimes desirable to have an increasing force limiting safety device having a force limiting characteristic curve such as that of fig. 8, and a decreasing force limiting safety device having a force limiting characteristic curve such as that of fig. 9. Especially, the incremental force limiting type safety device shown in fig. 8 has better protection effect for adult passengers of rear seats of some cars and children on the rear seats provided with child safety seats. Therefore, there is a need for a safety belt and components thereof having an increasing force limiting characteristic curve, which is further improved based on the above-mentioned constant force limiting safety device.
Disclosure of Invention
The invention provides a retractor for a safety belt, which is applied to the safety belt device and can realize incremental force limitation. The invention further provides an end cover, an annular gear ring and a safety belt assembly using the retractor.
The invention provides a retractor for a safety 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 the position corresponding to the outward traction direction of the mesh belt.
The scroll comprises a mandrel and separate end covers, wherein the mandrel is provided with a through hole along the central axis and is used for winding a braid; outer teeth matched with the inner tooth sections on the retractor frame are arranged on the outer periphery of the end cover;
the torsion bar is in a rod shape, is arranged in the reel 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 meshed with the internal teeth arranged in the middle of the axis of the reel and the internal teeth arranged in the middle of the core shaft at the crossing position of the torsion bar and one end cover through a gear, and the end cover is called as a first end cover; the other end cover is screwed with the other end cover through the internal and external threads at the crossed position of the other end cover, and the other end cover is called as a second end cover;
in a free state, the winding shaft is rotatably and floatingly arranged in the retractor frame, two end covers are arranged in circular holes in two side walls of the retractor frame, and internal and external threads between the torsion bar and the second end cover are not screwed; when the reel is locked, the external teeth of the two end covers of the reel are meshed with the internal tooth sections on the frame.
Optionally, the gear ring also comprises an annular gear ring with external threads arranged on the periphery and internal teeth arranged in an inner hole,
a threaded hole matched with the peripheral thread of the annular gear ring is formed in the center of the end face side, facing the mandrel, of the second end cover;
the end part of the torsion bar corresponding to the second end cover is provided with external teeth matched with the internal teeth of the annular gear ring;
after assembly, the external teeth at the end of the torsion bar are arranged in the annular gear ring, and the annular gear ring is screwed into the threaded hole of the second end cover.
Optionally, the axial length of the torsion bar is not greater than the axial length of the spool;
a concave hole with internal teeth is formed in the center of the end face side, facing the mandrel, of the first end cover, and circumferential external teeth matched with the concave hole are arranged at the corresponding end part of the torsion bar;
the threaded hole formed in the second end cover is a blind hole.
Optionally, the effective lengths of the rod sections on the two sides of the external teeth arranged in the middle of the axis of the torsion rod are different in the axial direction.
Optionally, the torsion bar is divided into two sections which are butted together in the axial direction, two ends of each section of the torsion bar are provided with external teeth, and the external teeth at the butted end parts of the two sections of the torsion bar are aligned in tooth form; the circumferential external teeth at the butt joint end parts of the two sections of torsion bars jointly form the external teeth arranged in the middle.
Optionally, the two sections of the torsion bar have different diameters and/or different materials.
Optionally, the length of the torsion bar in the axial direction is greater than the length of the reel in the axial direction; a through hole with an inner gear ring is arranged in the center of the end face side of the first end cover facing the mandrel, and circumferential external teeth matched with the concave hole are arranged at the corresponding end part of the torsion bar;
the threaded hole formed in the second end cover is a through hole.
The invention also provides an end cover which is applied to the retractor, wherein the end cover is in a flat cylinder shape, and a central concave hole with an internal thread is arranged at the central position of one end surface side of the end cover; and external teeth are arranged along the circumferential direction of the end cover in a whole circle.
The invention also provides an annular gear ring which is applied to the retractor, wherein the outer periphery of the annular gear ring is provided with external threads, and the inner hole is provided with internal teeth along the circumferential direction.
The invention also provides a safety belt assembly which uses the safety belt retractor.
Compared with the prior art, one end of a torsion bar of the retractor for the safety belt is meshed with a first end cover through a gear, and the other end of the torsion bar is screwed with a second end cover through threads, but the torsion bar is not screwed but keeps a certain number of screw pitches; the structure can realize incremental force limitation. The specific implementation process is as follows:
when the safety device of the retractor is applied, the braid drives the mandrel to rotate when collision occurs, and the middle part of the torsion bar is meshed with the inner teeth of the mandrel through the circumferential outer teeth at the middle part, so that the torsion bar bears the tension of the braid and drives the torsion bar to rotate; when the braid is tensioned, the two end covers of the mandrel can be locked on the frame, wherein the end part of the torsion bar meshed with the first end cover is fixed and cannot rotate, and the end part screwed with the second end cover and the second end cover retain certain thread turns and can rotate; that is, when the pulling force of the braid reaches the first limit value, the end portion engaged with the first end cover is fixed, while the end portion screwed with the second end cover and the whole torsion bar can rotate to a certain degree, so that the first bar section of the torsion bar is stressed to generate torsional deformation, the mandrel rotates to a certain degree, part of the braid is released, and the torsional deformation characteristic of the torsion bar can properly release the braid, thereby realizing the first-stage force limit; when the pulling force of the mesh belt reaches a second limit value, the second rod section is stressed, the first rod section and the second rod section are stressed simultaneously and rotate, and the mesh belt is released partially, so that a second-stage limit force is realized; because the force limit value of the first stage force limit is determined by the first rod section, and the force limit value of the second stage force limit is determined by the first rod section and the second rod section simultaneously, the second stage force limit value is larger than the first stage force limit value, namely, the incremental force limit is realized.
The application of the above-mentioned incremental force-limiting safety device is of particular importance in the case of simultaneous protection without other safety measures (e.g. airbags). For example, in the rear row of a car, or in a position where an airbag is not generally installed, such as a child seat, the use of the seat belt with the incremental force limitation can provide better protection. The reason is that under the condition of no safety air bag, when a collision accident occurs, the passenger can not lean forward for a large distance, and the limit value needs to be increased after a part of the woven belt is released by a smaller primary limit force, so that a larger torsion force needs to be overcome when the woven belt is pulled out to limit the forward-leaning distance of the passenger and avoid the collision with the front seat or other parts of the automobile; and the smaller first-level limiting force avoids the damage of the overlarge binding force to the human body.
Drawings
Fig. 1 is a schematic structural view of an 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 an exploded view of the spool and torsion bar assembly;
FIG. 4 is a cross-sectional view of FIG. 2 taken along the axial direction of the spool;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 is a schematic structural view of an integral torsion bar;
FIG. 7 is a graph of force limiting versus time characteristic of a constant force limiting safety device;
FIG. 8 is a graph of force limiting value versus time for an incremental force limiting safety device;
fig. 9 is a graph of force limiting value versus time for a decreasing force limiting safety device.
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.
Please refer to fig. 1, which is a schematic structural diagram of a retractor for a seat belt according to an embodiment of the present invention; in this embodiment, the retractor includes a retractor frame 1, a reel 2, and a torsion bar 3 (shown in fig. 3)
Wherein, coiler frame 1 is the U type, including two relative lateral walls: a first side wall 1-1 and a second side wall 1-2. And a third wall 1-4 connecting the first and second sidewalls 1-1 and 1-2. The first side wall 1-1 and the second side wall 1-2 are respectively provided with a circular first through hole 1-1a and a circular second through hole 1-2a at corresponding positions. Inner tooth sections 1-3 are arranged at corresponding positions on the two through holes. The inner segments 1-3 are intended to cooperate with outer teeth on the reel spool (the reel spool and its outer teeth will be described in more detail in the following description) for locking the reel spool. Therefore, the positions of the inner tooth sections 1-3 are the positions corresponding 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 the two through holes. By providing the inner tooth section at the above-described position, the locking position of the retractor can be fixed at the position where the inner tooth section is provided. This has overcome the unset problem in coiler locking position among the background art, is favorable to improving the accuracy to the 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.
Please refer to fig. 2, 3, 4 and 5. Wherein, fig. 2 is a schematic structural view of the reel in fig. 1; FIG. 3 is an exploded view of the spool and torsion bar assembly; FIG. 4 is a cross-sectional view of FIG. 2 taken along the axial direction of the spool; fig. 5 is a partially enlarged view of fig. 4.
The reel 2 comprises a mandrel 2-1 and end covers which are arranged at two ends of the mandrel 2-1 in a separable mode: a first end cap 2-2a and a second 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 2-1 is provided with a through hole 2-3 along the axis thereof, 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. Pin holes are also arranged on the end faces 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 second end cover 2-2b shown in fig. 3.
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. However, the weight-reduction grooves 2-5 are not essential and may not be provided.
The outer peripheries of the two end covers are provided with outer teeth, as shown in FIGS. 2 and 3, the outer periphery of the first end cover 2-2a is provided with outer teeth 2-2a-1, and the outer periphery of the second end cover 2-2b is provided with an outer gear ring 2-2 b-1. The outer teeth on the two end covers are all one-way teeth, and face the rotating direction of the mandrel 2-1 when the woven tape is released, and the outer teeth on the peripheries of the two end covers are matched with the inner tooth sections of the two through holes on the frame 1 (shown in figure 1).
When both end caps are provided on both end face sides of the spindle 2-1 in the manner shown in fig. 2, the 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 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. More importantly, the force limiting pins 2-6 can also bear the shearing force generated when the mandrel rotates, and can be cut off when the shearing force reaches a threshold value.
A recess hole (not shown in fig. 3) having internal teeth is also provided in the center of the end surface side of the first end cap 2-2a facing the mandrel 2-1. In this embodiment, the concave hole is disposed on the boss extending out of the end face side of the concave hole, and the corresponding end face side of the core shaft 2-1 is provided with a spigot for accommodating the boss. By arranging the boss and arranging the concave hole on the boss, the strength of the first end cover 2-2a can be effectively improved.
In this embodiment, a threaded hole 2-2b-3 with internal threads is formed in the center of the end face side of the second end cover 2-2b facing the mandrel 2-1, and the threaded hole 2-2b-3 is a blind hole. In particular, in the present embodiment, as shown in fig. 3, the screw hole 2-2b-3 is provided on the boss 2-2b-4 protruding from the side of the end face thereof. Correspondingly, a spigot for receiving the boss 2-2b-4 is provided on the corresponding end face side of the mandrel 2-1.
And an outward extending shaft 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. Such as the protruding shaft 2-2b-5 shown in fig. 1 and 3. Wherein one of the two protruding shafts is connected with the sensitive element. The other periphery is provided with teeth connected with the coil spring.
The retractor of the present embodiment further includes a torsion bar 3 as shown in fig. 3, the torsion bar 3 being in the shape of a bar, and the torsion bar being divided into two segments in the axial direction, referred to as a first bar segment 3a and a second bar segment 3 b. And outer teeth are arranged at two ends of each rod section. When the two sections of the torsion bar groups are integrated, two ends of the two sections of the torsion bar are butted together, the end surfaces are butted, and external teeth at the opposite ends are aligned without staggering teeth to form the integrated torsion bar. External teeth at the butt end portions of both ends of the torsion bar are fitted with internal teeth provided in the through hole of the spindle 2-1, as shown in fig. 4.
The external teeth at one of the outer end portions of the torsion bar are fitted with the internal teeth of the recessed hole in the first end cover 2-2a of the retractor of the present embodiment (the fitting relationship of the torsion bar and the retractor is described in detail in the following description). And the external teeth at the other outer end portion of the torsion beam are fitted with the internal teeth of the internal bore of the ring-shaped ring gear 3 as shown in fig. 3. In this embodiment, the length of the torsion bar 3 in the axial direction is not greater than the axial length of the retractor spool. In the description of the present embodiment, if a torsion bar is referred to, unless it is explicitly stated that a certain section of the torsion bar is referred to as a whole, the two sections are combined.
In this embodiment, the inner bore of the annular ring gear 3 is provided with a full circle of internal teeth which, as described above, cooperate with an outer end portion of the torsion bar. The periphery is provided with external threads along the circumferential direction, and the external threads are matched with the internal threads of the threaded hole 2-2b-3 on the second end cover 2-2 b.
During assembly, the torsion bar 3 is inserted into and penetrates through the through hole 2-3 of the mandrel 2-1, and the external teeth at the axial middle part of the torsion bar are meshed with the internal teeth arranged on the inner wall of the through hole 2-3 of the mandrel 2-1. The first end cover 2-2a and the second end cover 2-2b respectively cover the two end parts of the mandrel 2-1 from the left end and the right end, and force limiting pins at corresponding positions correspond to the pin holes. One end of the torsion bar 3 is inserted into the concave hole of the first end cover 2-2a, and the external teeth of the end part of the torsion bar are meshed with the internal teeth of the corresponding concave hole; the other end is inserted into the inner hole of the annular gear ring 3 and is meshed with the inner teeth of the inner hole. The annular gear ring 3 is screwed into the threaded hole 2-2b-3 of the second end cap 2-2b by the outer peripheral threads thereof, and the threads are not screwed, leaving a certain number of turns (e.g., one to two turns) of thread pitch. That is, the torsion bar 3 is engaged with the first end cap 2-2a at one end through internal and external teeth, and is screwed with the second end cap 2-2b at the other end through the ring gear 3.
The reel 2 is integrally disposed in the frame 1, and as shown in fig. 1, two end covers on the reel 2 are respectively disposed 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 the reel 2 can rotate freely to wind and release the mesh belt. And when the reel 2 is locked, the outer teeth of the two end covers of the reel 2 are meshed with the inner teeth of the corresponding positions on the frame 1, and the reel 2 cannot rotate.
The retractor of the embodiment works as follows: when collision happens, the ribbon drives the mandrel 2-1 to rotate, and the middle part of the torsion bar 3 is meshed with the inner teeth of the mandrel 2-1 through the circumferential outer teeth at the middle part, so that the torsion bar 3 is driven to rotate by bearing the pulling force of the ribbon. When the webbing is tightened, the two end covers of the spindle 2-1 are locked on the frame, wherein the first end cover 2-2a is engaged with one end cover of the torsion bar 3, so that the end of the torsion bar is fixed and can not rotate, and the other end is screwed with the second end cover through the annular gear ring engaged with the torsion bar, and the thread pitch of a certain number of turns is reserved for rotation. That is, when the pulling force of the braid reaches the first limit value, the end engaged with the first end cap 2-2a is fixed, while the end screwed with the second end cap 2-2b and the whole torsion bar can rotate to a certain extent, so that the first rod section 3a of the torsion bar 3 is forced to be twisted and deformed, further the mandrel 2-1 rotates to a certain angle, and partial braid is released, and the twisting deformation characteristic of the torsion bar 3 can properly release the braid, thereby realizing the first level of limit force. As the braid continues to apply tension to the mandrel, the end screw thread of the torsion bar 3 screwed with the second end cover 2-2b is screwed, the end of the torsion bar 3 does not rotate any more, when the braid tension reaches a second limit value, the second bar section 3b starts to bear force, at the moment, the first bar section 3a and the second bar section 3b bear force simultaneously, both rotate, and the braid is released partially, thereby realizing the second limit force. Since the limit value of the first level of limit force is determined by the first rod segment 3a, and the limit value of the second level of limit force is determined by the first rod segment 3a and the second rod segment 3b at the same time, the second level of limit force is greater than the first level of limit value, namely, the reel of the embodiment realizes the incremental limit force. Incremental force limiting safety devices are of particular interest in situations where there is no simultaneous protection by other safety measures (e.g., airbags). For example, in a position where an airbag is not generally installed, such as a rear passenger of a car or a child seat, the use of the incremental force limiting harness may provide better protection. The reason is that: under the condition that the rear row has no air bag, when a collision accident happens, a passenger cannot lean forward for a large distance, the limit value needs to be increased after the woven belt is partially released by the smaller primary limit force, so that the larger torsion force needs to be overcome when the woven belt is pulled out, the forward leaning distance of the passenger is limited, the collision of the front seat or other parts of the automobile is avoided, and the damage of the overlarge binding force to a human body is avoided by the smaller primary limit force.
In addition, in the present embodiment, the torsion beam 3 is segmented, and the effective lengths of the two segments may be different. The effective length refers to the axial length of the torsion bar or the bar section except for the shaft section with the external teeth at the two ends removed. The two sections of torsion bars can also be different in diameter and material. The segmented torsion bar can reduce the manufacturing difficulty and the manufacturing cost. In addition, the force limiting effect of different torsion grades is convenient to combine.
In the above embodiment, the end of the torsion bar 3 is connected to the second end cap 2-2b by engaging the annular ring gear 8. In another embodiment of the present invention, the ring gear 8 and the second end cap 2-2b may be integrally formed, or the ring gear 8 may be omitted and an external thread matching the threaded hole 2-2b-3 may be provided directly at the end of the torsion beam 3. Of course, this increases the difficulty of manufacturing the torsion beam 3 to some extent.
Further, in another embodiment of the present invention, the torsion beam 3 may not necessarily be a segment type, but may be an integral type, as shown in fig. 6. And will not be described in detail herein.
In addition, in the above embodiments, the torsion bar is described as an example in which the torsion bar does not extend 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 of the retractor described in the background of the application may also be applied thereto, in which case the length of the torsion bar in the axial direction is greater than the length of the spool in the axial direction. The center of the corresponding end cover needs to be provided with a through hole with a threaded hole (for the second end cover) or a through hole with internal teeth (for the first end cover). And will not be discussed further 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 (9)
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 inner tooth section is arranged at a position corresponding to the outward traction direction of the braid;
the scroll comprises a mandrel and separate end covers, wherein the mandrel is provided with a through hole along the central axis and is used for winding a braid; outer teeth matched with the inner tooth sections on the retractor frame are arranged on the outer periphery of the end cover;
the torsion bar is in a rod shape, is arranged in the reel 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 meshed with the internal teeth arranged in the middle of the axis of the reel and the internal teeth arranged in the middle of the core shaft at the crossing position of the torsion bar and one end cover through a gear, and the end cover is called as a first end cover; the other end cover is screwed with the other end cover through the internal and external threads at the crossed position of the other end cover, and the other end cover is called as a second end cover;
in a free state, the winding shaft is rotatably and floatingly arranged in the retractor frame, two end covers are arranged in circular holes in two side walls of the retractor frame, and internal and external threads between the torsion bar and the second end cover are not screwed; when the reel is locked, the outer teeth of the two end covers of the reel are meshed with the inner tooth sections on the frame;
also comprises an annular gear ring with external threads arranged on the periphery and internal teeth arranged in an inner hole,
a threaded hole matched with the peripheral thread of the annular gear ring is formed in the center of the end face side, facing the mandrel, of the second end cover;
the end part of the torsion bar corresponding to the second end cover is provided with external teeth matched with the internal teeth of the annular gear ring;
after assembly, the external teeth at the end of the torsion bar are arranged in the annular gear ring, and the annular gear ring is screwed into the threaded hole of the second end cover.
2. The retractor for a seatbelt according to claim 1, wherein an axial length of the torsion bar is not greater than an axial length of the spool;
a concave hole with internal teeth is formed in the center of the end face side, facing the mandrel, of the first end cover, and circumferential external teeth matched with the concave hole are arranged at the corresponding end part of the torsion bar;
the threaded hole formed in the second end cover is a blind hole.
3. The retractor for a seatbelt according to any one of claims 1 to 2, wherein effective lengths of both side bar segments of the external teeth provided in a central portion of the axis of the torsion bar are different in the axial direction.
4. The retractor for a safety belt according to any one of claims 1 to 2, wherein the torsion bar is divided into two segments butted together in the axial direction, both ends of each segment of the torsion bar are provided with external teeth, and the external teeth at the butted ends of the two segments of the torsion bar are aligned in tooth form; the circumferential external teeth at the butt joint end parts of the two sections of torsion bars jointly form the external teeth arranged in the middle.
5. The retractor for a seatbelt according to claim 4, wherein the two sections of the torsion bar have different diameters and/or different materials, respectively.
6. The retractor for a seatbelt according to claim 1, wherein a length of the torsion bar in an axial direction is greater than a length of the spool in the axial direction; a through hole with internal teeth is formed in the center of the end face side, facing the mandrel, of the first end cover, and circumferential external teeth matched with the through hole are formed in the corresponding end portion of the torsion bar;
the threaded hole formed in the second end cover is a through hole.
7. An end cap applied to the retractor according to any one of claims 1 to 6 wherein the end cap has a flat cylindrical shape, and a central concave hole with an internal thread is provided at a central position on one end surface side thereof; and external teeth are arranged along the circumferential direction of the end cover in a whole circle.
8. An annular gear ring applied to the retractor according to any one of claims 1 to 6 wherein the annular gear ring is provided at its outer periphery with external threads and the inner bore is provided with internal teeth along the circumferential direction.
9. A seatbelt assembly, wherein the seatbelt retractor according to any one of claims 1 to 6 is used.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310032779.0A CN103963737B (en) | 2013-01-29 | 2013-01-29 | Coiler, end cap, annular gear ring and seat belt assembly for seat belt |
| EP13833997.3A EP2889191B1 (en) | 2012-08-27 | 2013-08-23 | Retractor for safety belt, torsion bar, spool, end cap and safety belt 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 |
| 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 |
|---|---|---|---|
| CN201310032779.0A CN103963737B (en) | 2013-01-29 | 2013-01-29 | Coiler, end cap, annular gear ring and seat belt assembly for seat belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103963737A CN103963737A (en) | 2014-08-06 |
| CN103963737B true CN103963737B (en) | 2016-12-28 |
Family
ID=51233884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310032779.0A Expired - Fee Related CN103963737B (en) | 2012-08-27 | 2013-01-29 | Coiler, end cap, annular gear ring and seat belt assembly for seat belt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103963737B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104842929A (en) * | 2015-04-30 | 2015-08-19 | 宜兴市奥华汽配有限公司 | Gear tube component |
| CN107757550B (en) * | 2017-12-08 | 2024-02-23 | 沈阳金杯锦恒汽车安全系统有限公司 | Pretension force-limiting type automobile safety belt retractor |
| CN113183915B (en) * | 2020-11-18 | 2023-05-09 | 上海和励信息科技有限公司 | Retractor and motor-driven retractor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3524726B2 (en) * | 1997-09-08 | 2004-05-10 | サンコール株式会社 | Automotive seat belt winding device |
| DE102006049840B4 (en) * | 2006-10-23 | 2022-02-03 | Zf Automotive Germany Gmbh | Belt retractor for a vehicle occupant's safety belt |
| JP4953835B2 (en) * | 2007-01-17 | 2012-06-13 | オートリブ ディベロップメント エービー | Seat belt retractor |
| JP5276880B2 (en) * | 2008-03-31 | 2013-08-28 | 芦森工業株式会社 | Seat belt retractor |
| CN202130422U (en) * | 2011-06-10 | 2012-02-01 | 广东大豪汽车零部件实业有限公司 | Vehicular seat belt with pretightening and limiting mechanism |
| CN102837663B (en) * | 2012-08-27 | 2016-03-02 | 上海和励信息科技有限公司 | For torsion bar and Webbing retractor, the safety strap assembly of Webbing retractor |
-
2013
- 2013-01-29 CN CN201310032779.0A patent/CN103963737B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN103963737A (en) | 2014-08-06 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20180403 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: 20140806 Assignee: ZHEJIANG SONGYUAN AUTOMOTIVE SAFETY SYSTEMS CO.,LTD. Assignor: He Li Technology Co.,Ltd. Contract record no.: 2018990000336 Denomination of invention: Safety belt winder, end cap, annular tooth ring and safety belt assembly Granted publication date: 20161228 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: 20161228 |