CN110525374B - Force limiting type mandrel and safety belt retractor - Google Patents
Force limiting type mandrel and safety belt retractor Download PDFInfo
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- CN110525374B CN110525374B CN201910985616.1A CN201910985616A CN110525374B CN 110525374 B CN110525374 B CN 110525374B CN 201910985616 A CN201910985616 A CN 201910985616A CN 110525374 B CN110525374 B CN 110525374B
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000020347 spindle assembly Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
The invention relates to the technical field of safety belts, in particular to a force-limiting type mandrel and a safety belt retractor. On the one hand, the force limiting mandrel is provided with the curved clamping groove on the resistance piece, one end of the force limiting ring can be clamped in the Qu Xingka clamping groove, and the other end bypasses the abutting part and extends at least one circle on the end face of the mandrel body, so that the secondary force limiting stroke is improved in the secondary force limiting process. Simultaneously, still be provided with external screw thread connecting portion on the resistance spare, be provided with internal screw thread connecting portion on the inner wall of dabber body, at second grade limit in-process, along with the rotation of dabber body, internal screw thread connecting portion on the dabber body can screw in external screw thread connecting portion, the internal screw thread connecting portion of dabber body revolves to the root of external screw thread connecting portion when limit in the second grade limit in-process of limit ring is finished, under the effect of screw thread restriction this moment for dabber body and spindle nose stop relative rotation, realize the control to limit the power stop.
Description
Technical Field
The invention relates to the technical field of safety belts, in particular to a force-limiting type mandrel and a safety belt retractor.
Background
The seat belt is used for protecting a driver or a passenger when driving or riding a vehicle, and a collision accident occurs in the vehicle, and a retractor of the seat belt is locked, so that a human body can be restricted to a seat. However, when the traveling speed of the riding vehicle is high or a strong collision occurs, the seat belt continues to be pulled out by the inertia of the human body. In order to limit the continuous pulling-out of the safety belt, the prior art sets a force limiting structure in the mandrel of the safety belt retractor to limit the continuous pulling-out of the safety belt, but on one hand, the force limiting stroke of the existing force limiting structure is short, and on the other hand, the force limiting mode is single, so that the force limiting is to be improved.
Disclosure of Invention
The application aims to provide a force limiting type mandrel and a safety belt retractor, which are used for solving the technical problems that the force limiting stroke of the force limiting structure of the existing safety belt is short and the force limiting mode is single to a certain extent.
The application provides a force limiting type mandrel for a safety belt retractor, which comprises a mandrel body, a resistance piece, a force limiting ring and a shaft head, wherein the mandrel body is provided with a plurality of force limiting grooves;
The resistance piece is connected between the mandrel body and the shaft head; a curved clamping groove is formed at one end of the resistance piece, and an abutting part is formed on the end face of the mandrel body; one end of the force limiting ring is positioned in the curved clamping groove, and the other end of the force limiting ring can bypass the abutting part and extend on the end face of the mandrel body;
an external thread connecting part is formed on the outer wall of the resistance piece, and an internal thread connecting part matched with the external thread connecting part is formed on the mandrel body; when the mandrel body rotates relative to the shaft head along a first direction, the internal threaded connection part can be screwed into the external threaded connection part until the mandrel body and the shaft head stop rotating relative to each other.
In the above technical solution, preferably, the number of the abutting portions on the end face of the mandrel body is one, an extension portion of the force limiting ring on the end face of the mandrel body is spiral, and a rotation direction of the extension portion is the first direction.
In any of the above solutions, preferably, the mandrel body includes a mandrel and a stop nut;
The stop nut is arranged at one end, close to the shaft head, in the shaft barrel, a positioning groove is formed in the inner wall of the shaft barrel, a positioning part is formed in the outer wall of the stop nut, and the positioning part can be clamped into the positioning groove so that the stop nut can synchronously move with the shaft barrel; the internal surface of the stop nut forms the internal threaded connection.
In any of the above aspects, preferably, the resistance member includes a stem portion and a head portion;
The rod part is positioned in the mandrel, and one end of the rod part is connected with the mandrel body in a key way; the other end of the rod part is connected with the head part through a key;
The end face of the head part, which faces one end of the shaft head, is provided with the curved clamping groove, and the root part of the outer wall of the head part, which corresponds to the external thread connecting part, is provided with a stop part.
In any of the above solutions, preferably, a first protrusion, a second protrusion, and a third protrusion are formed on an end surface of the head facing one end of the shaft head;
A first curved groove is formed between the first protruding part and the second protruding part, a second curved groove is formed between the first protruding part and the third protruding part, and the first curved groove and the second curved groove are communicated and form the curved clamping groove;
The force limiting ring is provided with a first clamping part matched with the first curved groove and a second clamping part matched with the second curved groove, so that one end of the force limiting ring can be clamped in the curved clamping groove.
In any of the above technical solutions, preferably, the second protruding portion and the third protruding portion are located at two sides of the first protruding portion, and the first protruding portion is columnar, so that the first curved groove and the second curved groove form a curved clamping groove with a ring shape.
In any of the above technical solutions, preferably, a fourth protrusion is further provided between the second protrusion and the third protrusion, a third limiting groove is formed between the fourth protrusion and the second protrusion, and a fourth curved groove is formed between the fourth protrusion and the third protrusion; the third limit groove, the first curved groove, the second curved groove and the fourth curved groove are sequentially communicated to form the curved clamping groove;
The force limiting ring is further provided with a third clamping part matched with the third limiting groove and a fourth clamping part matched with the fourth curved groove, and the third clamping part, the first clamping part, the second clamping part and the fourth clamping part are sequentially connected and can be clamped in the curved clamping groove.
In any of the above-mentioned technical solutions, preferably, the number of the fourth protruding portions is two, and the two fourth protruding portions are symmetrically disposed on two sides of the first protruding portion, and form two third limiting grooves and two fourth curved grooves that are symmetrical with respect to the first protruding portion with the second protruding portion and the third protruding portion.
In any of the above technical solutions, preferably, a fifth clamping portion and an extension portion sequentially connected with the third clamping portion are further formed on the force limiting ring;
The fifth clamping part can extend to one side, deviating from the resistance piece, of the abutting part, the extending part extends in a spiral mode on the end face of the mandrel body, and when the mandrel rotates along the first direction relative to the shaft head, the abutting part can abut against the fifth clamping part and pushes the fifth clamping part and the extending part to be wound on the outer wall of the head.
The application also provides a safety belt retractor, which comprises the force limiting mandrel.
Compared with the prior art, the invention has the beneficial effects that:
According to the force limiting type mandrel, on one hand, the curved clamping groove is formed in the resistance piece, one end of the force limiting ring can be clamped in the Qu Xingka clamping groove, and the other end of the force limiting ring can bypass the abutting part and extend at least one circle on the end face of the mandrel body, so that the secondary force limiting stroke is improved in the secondary force limiting process. Simultaneously, still be provided with external screw thread connecting portion on the resistance spare, be provided with internal screw thread connecting portion on the inner wall of dabber body, at the second grade limit in-process, along with the rotation of dabber body, internal screw thread connecting portion on the dabber body can screw in external screw thread connecting portion, limit the annular space that the whole winding of limit force ring was in between the head of butt portion and resistance spare after the second grade limit in-process of limit force ring was over, the internal screw thread connecting portion and the external screw thread connecting portion of dabber body assemble in place this moment, under the effect of screw thread restriction, stop relative rotation between dabber body and the head of resistance spare, thereby make dabber body and spindle nose stop relative rotation, realize the control to limit force stop.
The safety belt retractor comprises the force limiting mandrel, so that the safety belt retractor has the beneficial effects of improving the force limiting stroke and simultaneously controlling the force limiting stop better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a resistance member of a force-limiting mandrel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the head of the resistance element of the force-limiting mandrel according to the embodiment of the present invention;
FIG. 3 is a schematic view of a resistance member and a stop nut of a limited force mandrel according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a mandrel body of a force-limiting mandrel according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a force limiting ring of a force limiting mandrel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an assembly structure of a force limiting ring and a resistance member of a force limiting mandrel and the mandrel according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of a force limiting mandrel according to an embodiment of the present invention.
Reference numerals:
1-mandrel body, 12-mandrel, 121-abutment, 122-detent, 13-stop nut, 131-detent, 132-female connection, 2-resistance, 21-stem, 22-head, 221-first boss, 222-second boss, 223-third boss, 224-fourth boss, 225-first curved slot, 226-second curved grooves, 227-third limit grooves, 228-fourth curved grooves, 229-stop portions, 230-external threaded connection portions, 3-force limiting rings, 31-first clamping portions, 32-second clamping portions, 33-third clamping portions, 34-fourth clamping portions, 35-fifth clamping portions, 36-extension portions and 4-spindle heads.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown.
The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A force limiting spindle and a seatbelt retractor according to some embodiments of the present invention are described below with reference to fig. 1 to 7.
Referring to fig. 1 to 7, an embodiment of the present application provides a force limiting type mandrel including a mandrel body 1, a resistance member 2, a force limiting ring 3, and a shaft head 4, wherein the mandrel body 1 is used for winding a seat belt; the resistance piece 2 is used for connecting the mandrel body 1 and the shaft head 4, and can cooperate with the force limiting ring 3 to limit the relative rotation between the mandrel body 1 and the shaft head 4.
Specifically, referring to fig. 1,4, 6 and 7, the mandrel body 1 is hollow, a safety belt is wound on the outer wall of the mandrel body 1, and a shaft head 4 is disposed at one end of the mandrel body 1. The resistance piece 2 comprises a rod part 21 and a head part 22, one end of the rod part 21 is positioned in the mandrel body 1 and is in spline connection with the first end of the mandrel body 1, the other end of the rod part 21 is connected with one end of the head part 22, the other end of the head part 22 extends out of the end face of the second end of the mandrel body 1 and is clamped with the shaft head 4, a curved clamping groove is formed in the end face of the other end of the head part 22, and one end of the force limiting ring 3 is clamped in the Qu Xingka clamping groove, so that one end of the force limiting ring 3 can be fixed relative to the head part 22; an abutting portion 121 is formed on the end face of the second end of the mandrel body 1, the abutting portion 121 is located on the side portion of the curved clamping groove, the other end of the force limiting ring 3 can bypass the outer side of the abutting portion 121 and extend on the end face of the mandrel body 1, and the extending direction of the force limiting ring 3 is the direction opposite to the rotating direction of the mandrel body 1 when the safety belt is pulled out. Therefore, during normal running, the mandrel body 1 and the shaft head 4 synchronously rotate, and the safety belt can be pulled out or retracted normally; in the event of a crash, the belt pretensioner controls the spindle head 4 to stop rotating, so that the head 22 of the resistance element 2 also stops rotating, and the inertia of the human body pulls the belt to be pulled out, so that the spindle body 1 continues to rotate relative to the spindle head 4, and the abutment 121 on the spindle body 1 also rotates accordingly. When the mandrel body 1 rotates relative to the shaft head 4, the two ends of the rod part 21 of the resistance element 2 are unbalanced in stress, so that the rod part 21 of the resistance element 2 can be twisted, and the twisting process of the rod part 21 is the primary force limiting of the mandrel body 1. In the process of rotating the mandrel body 1, since one end of the force limiting ring 3 bypasses the abutting portion 121, in the process of rotating the mandrel body 1, the abutting portion 121 can abut against the force limiting ring 3 and push the portion of the force limiting ring 3 extending to the end face of the mandrel body 1 to be wound between the abutting portion 121 and the resistance piece 2 until the force limiting ring 3 fills up the annular space between the abutting portion 121 and the resistance piece 2, and the mandrel body 1, the resistance piece 2 and the shaft head 4 stop rotating, and in the process, the force limiting ring 3 deforms to prevent the rotation of the mandrel body 1, so that the process is a secondary force limiting on the mandrel body 1.
It should be noted that, the pretensioning action of the belt pretensioner on the shaft end is a mature technology in the prior art, so the specific principle process is not described in detail.
For the above force limiting process, referring to fig. 2, 5 and 6, since the force limiting mandrel in the embodiment of the present application is provided with the curved clamping groove at the head 22 of the resistance element 2, one end of the force limiting ring 3 is clamped in the Qu Xingka clamping groove, that is, the effect of stabilizing the clamping stagnation is achieved on one end of the force limiting ring 3, and meanwhile, the other end of the force limiting ring 3 extends on the end face of the mandrel body 1, so that the secondary force limiting stroke of the force limiting ring 3 is selected, and on the premise of ensuring that one end of the force limiting ring 3 is fixed, the extending length of the force limiting ring 3 on the end face of the mandrel body 1 can be selectively set according to the requirement of the secondary force limiting stroke. Preferably, the number of the abutting parts 121 on the end surface of the mandrel body 1 is one, the extending part of the force limiting ring 3 on the end surface of the mandrel body 1 is spiral, and the corresponding degree of the central angle is more than or equal to 360 degrees, namely the secondary force limiting stroke of the mandrel body 1 is at least one circle; the rotation direction of the extending part of the force limiting ring 3 on the end face of the mandrel body 1 is a first direction, and the first direction is the opposite direction of the rotation direction of the mandrel body 1 when the safety belt is pulled out.
The rod 21 and the head 22 of the resistance element 2 may be integrally formed, or may be separately formed, preferably, the rod 21 and the head 22 are spline-connected.
In addition, referring to fig. 1,3 and 4, in order to better control the stopping of the force limiting process, the external screw thread connecting part 230 is arranged on the outer wall of the head 22 of the resistance member 2, the internal screw thread connecting part 132 is arranged on the inner wall surface of one end of the corresponding mandrel body 1, the internal screw thread connecting part 132 and the external screw thread connecting part 230 are matched, in the secondary force limiting process, along with the rotation of the mandrel body 1, the internal screw thread connecting part 132 on the mandrel body 1 can be screwed into the external screw thread connecting part 230, after the secondary force limiting process of the force limiting ring 3 is finished, namely, the force limiting ring 3 is fully wound in the annular space between the abutting part 121 and the head 22 of the resistance member 2, at the moment, the internal screw thread connecting part 132 of the mandrel body 1 is screwed to the root part of the external screw thread connecting part 230, namely, the internal screw thread connecting part 132 and the external screw thread connecting part 230 are assembled into place, and at the moment, under the action of the screw thread limiting, the relative rotation between the mandrel body 1 and the head 22 of the resistance member 2 is stopped, so that the mandrel body 1 and the spindle head 4 stops rotating relatively, and the force limiting process is better controlled. Preferably, a stop portion 229 is provided at the root of the head 22 of the resistance element 2 corresponding to the external threaded connection portion 230 thereof, the stop portion 229 being capable of further stopping the mandrel body 1, ensuring that a force-limiting stop can be achieved.
Preferably, referring to fig. 3 and 4, the mandrel body 1 includes a mandrel 12 and a stop nut 13, the stop nut 13 is disposed at one end of the mandrel 12 near the mandrel head 4, and the inner wall of the mandrel 12 is provided with one or more positioning grooves 122, the outer wall of the stop nut 13 is provided with a positioning part 131 corresponding to the positioning groove 122, and the positioning part 131 can be clamped into the positioning groove 122, so that the stop nut 13 can move synchronously with the mandrel 12; the inner surface of the stop nut 13 forms an internally threaded connection 132.
Furthermore, it should be noted that the force limiting stop of the internal threaded connection 132 on the stop nut 13 and the external threaded connection 230 on the resistance element 2 can be performed simultaneously with the secondary force limiting of the force limiting ring 3, i.e. when the secondary force limiting is stopped, the internal threaded connection 132 of the stop nut 13 is screwed onto the stop 229 on the resistance element 2. In addition, the force limiting stop process of the internal thread connection portion 132 on the stop nut 13 and the external thread connection portion 230 on the resistance member 2 may be performed or stopped in synchronization with the secondary force limiting process of the force limiting ring 3, that is, the force limiting stop process may be completed by screwing the internal thread connection portion 132 of the stop nut 13 to the stop portion 229 on the resistance member 2 when the secondary force limiting is not stopped. Whether the secondary force limiting process and the force limiting stopping process are performed or stopped synchronously is mainly based on the requirement of the spindle assembly on a safety belt protection mode.
Some preferred embodiments of the curved snap-fit grooves of the head 22 of the resistance element 2 and the corresponding force limiting ring 3 according to the present application are described below with reference to fig. 2, 5 and 6.
In the embodiment of the present application, as shown in fig. 2, 5 and 6, the first, second and third protrusions 221, 222 and 223 are formed on the end surface of the head 22 of the resistance element 2 toward one end of the stub shaft 4;
A first curved groove 225 is formed between the first boss 221 and the second boss 222, a second curved groove 226 is formed between the first boss 221 and the third boss 223, and the first curved groove 225 and the second curved groove 226 are communicated and form a curved clamping groove; the force limiting ring 3 is formed with a first clamping portion 31 adapted to the first curved groove 225 and a second clamping portion 32 adapted to the second curved groove 226, so that one end of the force limiting ring 3 can be clamped in the Qu Xingka connecting groove. And preferably, the second boss 222 and the third boss 223 are located at both sides of the first boss 221, and the first boss 221 is cylindrical, so that the first curved groove 225 and the second curved groove 226 form a curved clamping groove having a ring shape. The annular curved clamping groove can play a more stable limiting role on one end of the force limiting ring 3, friction force between the force limiting ring 3 and the head 22 of the resistance element 2 is increased, and the force limiting process is more stable.
In addition, in order to further improve the limit of the curved clamping groove on one end of the force limiting ring 3, as shown in fig. 2, 5 and 6, preferably, a fourth protrusion 224 is further disposed between the second protrusion 222 and the third protrusion 223, a third limit groove 227 is formed between the fourth protrusion 224 and the second protrusion 222, and a fourth curved groove 228 is formed between the fourth protrusion 224 and the third protrusion 223; the third limiting groove 227, the first curved groove 225, the second curved groove 226 and the third curved groove are sequentially communicated to form a curved clamping groove; the force limiting ring 3 is correspondingly provided with a third clamping part 33 matched with the third limiting groove 227 and a fourth clamping part 34 matched with the fourth curved groove 228, and the third clamping part 33, the first clamping part 31, the second clamping part 32 and the fourth clamping part 34 are sequentially connected and can be clamped in the Qu Xingka connecting grooves. Through setting up a plurality of curved grooves on the head 22 of resistance 2, can further increase the stability to limiting displacement's of limit force ring 3, further increased the frictional force of limit force ring 3 and the head 22 of resistance 2 simultaneously, limit force process is more stable.
In addition, in order to increase the applicability of the resistance element 2 and the force limiting ring 3 of the present application to meet the situation that the mandrel body 1 rotates in different directions when the seat belt is pulled, the embodiment of the present application designs two ways for the assembly positions of the resistance element 2 and the force limiting ring, as shown in fig. 2, 5 and 6, and can act on the force limiting effect when the mandrel body 1 rotates in the clockwise or counterclockwise direction when the seat belt is pulled. Specifically, in the embodiment of the present application, the number of the fourth protrusions 224 is two, the two fourth protrusions 224 are symmetrically disposed at both sides of the first protrusion 221, and two third limit grooves 227 and two fourth curved grooves 228 are formed symmetrically with respect to the first protrusion 221 with the second protrusion 222 and the third protrusion 223, so that the first curved groove 225, the second curved groove 226 and one third limit groove 227 and one fourth curved groove 228 on one side thereof form a first assembly position of the force limiting ring 3, and the first curved groove 225, the second curved groove 226 and one third limit groove 227 and one fourth curved groove 228 on the other side thereof form a second assembly position of the force limiting ring 3, and since the two third limit grooves 227 and the two fourth curved grooves 228 are respectively symmetrical with respect to the first protrusion 221, two symmetrical assembly positions with respect to the first protrusion 221 can be formed, so that one end of the force limiting wire mounted on the two assembly positions extends in opposite directions on the end surface of the mandrel body 1, i.e., corresponding to two different rotation directions of the mandrel body 1.
In addition, as shown in fig. 2,5 and 6, a fifth clamping portion 35 and an extension portion 36 sequentially connected with the third clamping portion 33 are further formed on the force limiting ring 3; preferably, the fifth clamping portion 35 has a certain radian and is used for being abutted against the abutting portion 121, so that the pushing process of the abutting portion 121 to the force limiting ring 3 is more stable; the extending portion 36 can extend to a side of the abutting portion 121 away from the resistance member 2, and the extending portion 36 extends spirally on the end surface of the mandrel body 1, so that when the mandrel rotates along the first direction relative to the shaft head 4, the abutting portion 121 can abut against the fifth clamping portion 35, and the fifth clamping portion 35 and the extending portion 36 are pushed to be wound on the outer wall of the head 22.
The application also provides a safety belt retractor, which comprises the force limiting type mandrel. Since the seatbelt retractor system includes a force limiting spindle, it has all the beneficial effects of the force limiting spindle, which are not described in detail herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. The force limiting type mandrel is used for a safety belt retractor and is characterized by comprising a mandrel body, a resistance piece, a force limiting ring and a shaft head;
The resistance piece is connected between the mandrel body and the shaft head; a curved clamping groove is formed at one end of the resistance piece, and an abutting part is formed on the end face of the mandrel body; one end of the force limiting ring is positioned in the curved clamping groove, and the other end of the force limiting ring can bypass the abutting part and extend on the end face of the mandrel body;
An external thread connecting part is formed on the outer wall of the resistance piece, and an internal thread connecting part matched with the external thread connecting part is formed on the mandrel body; when the mandrel body rotates relative to the shaft head along a first direction, the internal thread connecting part can be screwed into the external thread connecting part until the mandrel body and the shaft head stop rotating relative to each other;
The number of the abutting parts on the end face of the mandrel body is one, the extending part of the force limiting ring on the end face of the mandrel body is spiral, and the rotation direction of the extending part is the first direction;
The mandrel body comprises a mandrel barrel and a stop nut;
The stop nut is arranged at one end, close to the shaft head, in the shaft barrel, a positioning groove is formed in the inner wall of the shaft barrel, a positioning part is formed in the outer wall of the stop nut, and the positioning part can be clamped into the positioning groove so that the stop nut can synchronously move with the shaft barrel; the inner surface of the stop nut forms the internal thread connecting part;
The resistance member includes a stem portion and a head portion;
The rod part is positioned in the mandrel, and one end of the rod part is connected with the mandrel body in a key way; the other end of the rod part is connected with the head part through a key;
The end face of the head part, which faces one end of the shaft head, is provided with the curved clamping groove, and the root part of the outer wall of the head part, which corresponds to the external thread connecting part, is provided with a stop part;
a first protruding part, a second protruding part and a third protruding part are formed on the end face of the head part facing one end of the shaft head;
A first curved groove is formed between the first protruding part and the second protruding part, a second curved groove is formed between the first protruding part and the third protruding part, and the first curved groove and the second curved groove are communicated and form the curved clamping groove;
A first clamping part matched with the first curved groove and a second clamping part matched with the second curved groove are formed on the force limiting ring, so that one end of the force limiting ring can be clamped in the curved clamping groove;
The second protruding part and the third protruding part are positioned at two sides of the first protruding part, and the first protruding part is columnar, so that the first curved groove and the second curved groove form the curved clamping groove which is annular;
A fourth protruding part is further arranged between the second protruding part and the third protruding part, a third limiting groove is formed between the fourth protruding part and the second protruding part, and a fourth curved groove is formed between the fourth protruding part and the third protruding part; the third limit groove, the first curved groove, the second curved groove and the fourth curved groove are sequentially communicated to form the curved clamping groove;
The force limiting ring is further provided with a third clamping part matched with the third limiting groove and a fourth clamping part matched with the fourth curved groove, and the third clamping part, the first clamping part, the second clamping part and the fourth clamping part are sequentially connected and can be clamped in the curved clamping groove.
2. The force limiting mandrel of claim 1, wherein the number of the fourth protrusions is two, and the two fourth protrusions are symmetrically disposed on two sides of the first protrusion, and form two third limit grooves and two fourth curved grooves with the second protrusion and the third protrusion, which are symmetrical with respect to the first protrusion.
3. A force limiting mandrel as claimed in claim 2 wherein a fifth clamping portion and an extension portion are further formed on the force limiting ring, which are sequentially connected to the third clamping portion;
The fifth clamping part can extend to one side, deviating from the resistance piece, of the abutting part, the extending part extends in a spiral mode on the end face of the mandrel body, and when the mandrel rotates along the first direction relative to the shaft head, the abutting part can abut against the fifth clamping part and pushes the fifth clamping part and the extending part to be wound on the outer wall of the head.
4. A seatbelt retractor comprising a force limiting spindle according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910985616.1A CN110525374B (en) | 2019-10-16 | 2019-10-16 | Force limiting type mandrel and safety belt retractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910985616.1A CN110525374B (en) | 2019-10-16 | 2019-10-16 | Force limiting type mandrel and safety belt retractor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110525374A CN110525374A (en) | 2019-12-03 |
| CN110525374B true CN110525374B (en) | 2024-05-17 |
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| CN201910985616.1A Active CN110525374B (en) | 2019-10-16 | 2019-10-16 | Force limiting type mandrel and safety belt retractor |
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| CN (1) | CN110525374B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104494558A (en) * | 2014-12-01 | 2015-04-08 | 延锋百利得（上海）汽车安全系统有限公司 | Seat belt retractor with load limit stopping function |
| CN109278699A (en) * | 2018-12-04 | 2019-01-29 | 沈阳金杯锦恒汽车安全系统有限公司 | A kind of coiler mandrel component and seat belt retractor |
| CN109291877A (en) * | 2018-12-04 | 2019-02-01 | 沈阳金杯锦恒汽车安全系统有限公司 | Novel preload limit type seat belt retractor |
| CN211001238U (en) * | 2019-10-16 | 2020-07-14 | 沈阳金杯锦恒汽车安全系统有限公司 | Force limiting type mandrel and safety belt retractor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011087413A1 (en) * | 2011-11-30 | 2013-06-06 | Autoliv Development Ab | Belt retractor with two parallel force limiting devices |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104494558A (en) * | 2014-12-01 | 2015-04-08 | 延锋百利得（上海）汽车安全系统有限公司 | Seat belt retractor with load limit stopping function |
| CN109278699A (en) * | 2018-12-04 | 2019-01-29 | 沈阳金杯锦恒汽车安全系统有限公司 | A kind of coiler mandrel component and seat belt retractor |
| CN109291877A (en) * | 2018-12-04 | 2019-02-01 | 沈阳金杯锦恒汽车安全系统有限公司 | Novel preload limit type seat belt retractor |
| CN211001238U (en) * | 2019-10-16 | 2020-07-14 | 沈阳金杯锦恒汽车安全系统有限公司 | Force limiting type mandrel and safety belt retractor |
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| CN110525374A (en) | 2019-12-03 |
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