CN102837663A - Torsion bar for safety belt coiling device as well as safety belt coiling device and safety belt assembly - Google Patents
Torsion bar for safety belt coiling device as well as safety belt coiling device and safety belt assembly Download PDFInfo
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- CN102837663A CN102837663A CN201210308979XA CN201210308979A CN102837663A CN 102837663 A CN102837663 A CN 102837663A CN 201210308979X A CN201210308979X A CN 201210308979XA CN 201210308979 A CN201210308979 A CN 201210308979A CN 102837663 A CN102837663 A CN 102837663A
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Abstract
The invention provides a torsion bar for a safety belt coiling device. The torsion bar is in a bar shape and the axial length of the torsion bar is not more than the axial length of a coiling shaft; peripheral outer teeth are arranged at two end parts and the middle part of the torsion bar and the outer teeth at the two end parts of the torsion bar are matched with inner teeth of central concave holes of end faces of the two end faces on the coiling device; the peripheral outer teeth at the middle part are matched with inner teeth arranged at the middle section of a through hole at a central axis position of a core shaft; the torsion bar is divided from the middle part of the axial direction to form a two-section type structure; and the peripheral outer teeth at the middle part are located at abutted end parts of two sections. Compared with the prior art, the torsion bar disclosed by the invention does not pass through an end cover and is shorter in length, so that the torsion bar is not easy to bend and deform and the use process is safer and more stable. The torsion bar is divided into the two sections, so that different safety belt force limiting value requirements can be met through the combination of different diameters or materials. The invention further provides the safety belt coiling device using the torsion bar and a safety belt assembly.
Description
Technical field
The present invention relates to the safety strap technology, be specifically related to a kind of torsion bar that is used for Webbing retractor.The present invention relates to a kind of Webbing retractor and safety strap assembly that uses said torsion bar simultaneously.
Background technology
Safety strap is the important passive security parts that are applied on the automobile.When collision happens, safety strap can be protected the user, makes it avoid or alleviate the secondary injury in when collision.
What be designed at first is applied to the standard body-restraining seat belt on the automotive seat, and it only comprises lockable mechanism and the ribbon that is used for fixing user's (human body).When collision happens, lockable mechanism locking, ribbon no longer outwards stretch, thereby the user is bundled on the automotive seat.Yet because the impact moment velocity variations is very fast, it is very short that speed at time of impact changes the momentum change time that causes, it is very big to make that ribbon acts on user's power on one's body, for example can reach 8-10kN.Can cause user's rib to fracture even more serious injury.
Based on above-mentioned reason; The standard model safety strap is further improved; Proposed the limit type safety strap,, can act on the power on the human body through certain limit force mechanisms restriction ribbon promptly in impact moment; Can not cause human body to receive the injury of ribbon itself, to reach the purpose of protecting the user to greatest extent.
At document number is in the european patent document of EP1607288B1, discloses a kind of safety device that is used for the limit type safety strap.Concrete, in second embodiment of said european patent document, disclosed safety device comprises a U type framework, spool and torsion bar.On the relative two side of said U type framework, be provided with the circular port of band internal tooth.Spool comprises the mandrel and the separation type end cap that is arranged at the mandrel two ends that is used to twine ribbon.Said end cap be provided with framework on the external tooth that is complementary of internal tooth; Rotatable the floating of said spool is arranged on the said U type framework; And two end cap is arranged at respectively in the circular port of said U type framework, and under normal condition, the external tooth on the end cap and the internal tooth of said circular port do not mesh; Spool can rotate in said circular port, to twine ribbon or to discharge ribbon.
Said torsion bar is shaft-like, is arranged among the spool along said spool axis, and connects through interior external tooth engagement system along the axis centre position at said spool; In addition, said two end cap center is passed at said torsion bar two ends, stretches out outside the end cap and is meshed with internal tooth on the two end cap through external tooth.
Above-mentioned limit type erecting device working process is following: when bumping; Sensing device triggers the actuating mechanism that comprises gas generator; Make the external tooth on the end cap of spool be meshed, spool is become lockup state by rotatable quick condition (also can be described as free state) with the internal tooth of U type framework.Make the ribbon that is wrapped on the spool no longer outwards discharge.Thereby the user is fixed on the seat.In this process, what ribbon bore comes from the user owing to the power that the moves forward meeting that inertia produces is bigger and bigger, and this power is always in the mandrel rotation of attempting to draw spool.But the torsion bar of mandrel through being engaged with, be fixed on the U type framework with torsion bar ingear end cap and can't rotate.When the tractive force of ribbon can make greatly that enough torsion bar produces the distortion rotation; The rotation of certain angle will take place in mandrel; Thereby make ribbon can be released out a segment length, and then make the user can produce certain displacement forward, alleviate ribbon and act on user's pulling force on one's body; Reach the effect that ribbon acts on user's power on one's body that limits, obtained limit power effect.
The key character of above-mentioned patent is that the torsion bar two ends are fixed, and the stage casing is through interior external tooth engagement mandrel; Make torsional deflection be evenly distributed on the whole torsion bar; Prevent stress raisers and rupture, and can make full use of the material of torsion bar, produce the limit power effect of stable and consistent.In addition, torsion bar deformation process symmetry makes taking-up device frame stressing balance, and the torsional deflection of framework is little.
The detailed content of the limit type erecting device of relevant above-mentioned patent documentation can be further referring to above-mentioned european patent document.
Yet; The disclosed limit type safety device of above-mentioned European patent also has certain defective; Subject matter is; The both ends that torsion bar wherein stretches out end cap also receive the constrained force from other structures, make whole torsion bar stressed complicated, are easy to generate stress raisers and fracture failure.Because the torsion bar stressing conditions has bigger relation with its extension at torsional direction, the disclosed limit type safety device of described European patent can produce the complicated problem of torsion bar extension situation, makes comparatively accuracy control limit power value of this device difficult.
In addition, the processing of torsion bar need adopt cold-press process to guarantee the conformability of its characteristic, and part is long more, and difficulty of processing and die manufacturing cost are high more, and the torsion bar that above-mentioned European patent provides is long, makes its cost high, and manufacture difficulty is big.
Summary of the invention
The present invention provides a kind of torsion bar that is used for safety strap, to solve the problems referred to above of the torsion bar that has Webbing retractor now.The present invention provides taking-up device and the safety strap assembly that uses torsion bar in addition.
The present invention provides a kind of torsion bar that is used for Webbing retractor; Said Webbing retractor comprises taking-up device framework and spool; Said spool comprises the mandrel that is provided with through hole along the axis and is used to twine ribbon, and separable two end caps that are arranged at the mandrel two ends respectively; Said end cap is provided with the center shrinkage pool of band internal tooth towards the center of the inner end surface of mandrel; The middle section position of the through hole of position, said mandrel axis is provided with internal tooth; It is characterized in that:
Said torsion bar is shaft-like, and its length vertically is not more than the axial length of said spool; Be provided with circumferential external tooth at said torsion bar both ends and middle part; And the center shrinkage pool internal tooth of the two end cap end face on the external tooth that is positioned at the torsion bar both ends and the taking-up device matches, and the circumferential external tooth that is positioned at the torsion bar middle part matches with the internal tooth of the middle section position setting of the through hole of position, said mandrel axis;
Wherein, the two sectional type structure of said torsion bar for separating from axial middle part; The said circumferential external tooth that is arranged on the middle part promptly is positioned at two sections ends that connect.
Preferably, two of said torsion bar sections have different diameters and/or different materials respectively.
Preferably, all be provided with on the circumferential external tooth of two sections the end that connects of said torsion bar and dodge hypodontia, and two to dodge position that tooth lacks identical and jointly corresponding to passing on the mandrel and the fixing hold down groove of ribbon end.
The present invention provides a kind of Webbing retractor simultaneously, comprises taking-up device framework, spool and the described torsion bar of above-mentioned arbitrary technical scheme; Wherein,
Said taking-up device framework comprises two relative sidewalls; Opposite position is provided with the circular port of band internal tooth in said two side;
Said spool comprises the mandrel that is provided with through hole along the axis and is used to twine ribbon, and separable two end caps that are arranged at the mandrel two ends respectively; End cap is provided with external tooth along periphery, and towards the center of the inner end surface of mandrel the center shrinkage pool of band internal tooth is set; The middle section position of the through hole of position, said mandrel axis is provided with internal tooth;
Said torsion bar passes the through hole of said mandrel, and the external tooth at middle part is meshed with the internal tooth of mandrel through-hole wall; Insert respectively among the center shrinkage pool of said spool two end cap at said torsion bar two ends, and the external tooth at two ends is meshed with the internal tooth of the center shrinkage pool of said end cap inner end surface; This torsion bar has stable ductility in circumferential distortion;
Under free state, rotatable the floating of said spool is arranged in the said taking-up device framework, and two end cap places the circular port of the two side of said taking-up device framework; When locking, the external tooth of said spool two end cap is meshed with internal tooth on the said framework.
The present invention provides a kind of safety strap assembly simultaneously, the taking-up device that this safety strap assembly uses technique scheme to provide.
Compared with prior art, torsion bar provided by the invention has the following advantages: the two ends of torsion bar are arranged at the two end cap place of spool, and do not pass end cap, with respect to the torsion bar in the background technology, and this torsion bar contraction in length; The part that background technology extends, the projecting shaft that in this Webbing retractor, is set at the end cap outside replaces.The vehicle of the safety strap of application torsion bar of the present invention is when bumping, and ribbon drives said mandrel rotation, and drives the torsion bar rotation through the internal tooth in stage casing; And two end cap is locked on the framework, and two end cap meshes the both ends of torsion bar simultaneously, makes the both ends of torsion bar to rotate.So rotate in the middle of the torsion bar, and does not rotate at both ends, makes it bear twisting resistance; When this twisting resistance is enough big, the deformation that can twist of this torsion bar, thus make the rotation of mandrel generation certain angle; The strength that release portion ribbon, ribbon act on the safety strap user health is minimized.The torsion bar length that the present invention adopts shorter than in the background technology; And do not stretch out vertically outside the end cap, this makes that torsion bar is difficult for occuring bending and deformation, and is not come from outside the end cap of both sides other and retrain; The whole force-bearing situation of torsion bar is oversimplified, and use is safer stable.Torsion bar is difficult for occuring bending and deformation, and the relative angle between mandrel and the end cap is maintained, and can not cause localized metallic friction and gummed between mandrel and the end cap.In addition, because the material of torsion bar need satisfy special torsion requirement, its cost is high, makes and requires height, and the present invention adopts short torsion bar can also practice thrift cost, reduces manufacture difficulty.
In addition, torsion bar of the present invention is divided into coaxial two sections; The combination of the torsion bar section of two same diameter or different-diameter is used, capable of being combinedly gone out a plurality of torque values, thereby can form in the taking-up device with a plurality of limit power values, can satisfy the demands of different of different automobile vendors safety strap limit power value; In addition, because torsion bar is to adopt special substance and process through cold heading technique, for the torsion bar of each diameter, all independent mould will be arranged, the price of its manufacturing equipment and mould is all very expensive; Adopt the two sectional type torsion bar, can realize obtaining the torsion bar section of using less processing mold to process the limit power value of a plurality of requirements through array mode, thereby can reduce die sinking quantity, further practice thrift manufacturing cost.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the taking-up device that is used for safety strap of the present invention;
Fig. 2 is the structural representation of the spool among Fig. 1;
Fig. 3 is that Fig. 2 is along the axial cutaway view of spool;
Fig. 4 is the exploded view of reel unit and torsion bar assembling;
Fig. 5 is the scheme drawing of first section of the torsion bar of the embodiment of the invention;
Shown in Fig. 6 is the end profile of tooth of first section left end of torsion bar shown in Figure 5;
Fig. 7 shows the cooperation figure that the torsion bar left end is inserted the shrinkage pool of left side end cap;
Fig. 8 is cross section, a torsion bar middle part profile of tooth shown in Figure 5;
Fig. 9 shows the scheme drawing that torsion bar inserts cross section, middle part behind the mandrel;
Figure 10 inserts the scheme drawing that its outer toothed portion matches with the mandrel through hole in the mandrel for the torsion bar that the middle part external tooth has the hypodontia mouth;
Generalized section when Figure 11 is not assembled into one with other parts of spool simultaneously for two sectional type diameter for torsion bar in the embodiments of the invention.
The specific embodiment
A lot of details have been set forth in the following description so that make much of the present invention.But the present invention can implement much to be different from alternate manner described here, and those skilled in the art can do similar popularization under the situation of intension of the present invention, so the present invention does not receive the restriction of following disclosed practical implementation.
Please refer to Fig. 5, it is the structural representation of first section of torsion bar of the present invention.In the present embodiment, said torsion bar 3 is shaft-like, circumferentially is provided with external tooth 3-2a and external tooth 3-2b at its two ends and edge, middle part.And the center shrinkage pool internal tooth of the two end cap end face on the external tooth that is positioned at torsion bar 3 both ends and the taking-up device matches, and the circumferential external tooth that is positioned at the torsion bar middle part matches with the internal tooth of the middle section position setting of the through hole of position, said mandrel axis; Wherein, said torsion bar length vertically is not more than the axial length of said spool.Wherein, said torsion bar two sectional type structure first section 3a of difference and second section 3b for separating from axial middle part; The said circumferential external tooth that is arranged on the middle part promptly is positioned at two sections ends that connect.Said first section 3a and second section 3b.Axial length is identical, in the end of each section external tooth is set all vertically.When group was one, two sections torsion bars wherein were docking together at two ends, and end face connects, and the external tooth teeth of opposite end are corresponding, not side set.In the following description, if relate to torsion bar, then be meant by above-mentioned first section 3a and second section integral body that 3b combines.
For better understanding the torsion bar of present embodiment, torsion bar of the present invention is elaborated below in conjunction with the Webbing retractor of using this torsion bar.Need to prove that in the present embodiment, other parts of describing Webbing retractor mainly are in order better to understand the torsion bar of present embodiment, and this description should not constitute the restriction to the application's claim protection domain.
Please referring to Fig. 1, it is the wherein a kind of structural representation that is used for the taking-up device of safety strap of the present invention, and taking-up device comprises the described torsion bar 3 of taking-up device framework 1, spool 2 and present embodiment (comprising first section 3a and second section 3b)
Said taking-up device framework 1 is the U type, and it comprises two relative sidewalls: the first side wall 1-1 and the second sidewall 1-2.Comprise that also two connect the 3rd wall 1-4 of the said the first side wall 1-1 and the second sidewall 1-2.Opposite position is respectively arranged with the circular first through hole 1-1a and the second through hole 1-2a on the said the first side wall 1-1 and the second sidewall 1-2, and same position is provided with internal tooth section 1-3 (only showing the situation that the internal tooth section is set on the second through hole 1-2a among Fig. 1) on said two through hole.Said internal tooth section 1-3 be used for spool on external tooth match the spool locking, so the position that is provided with of said internal tooth section 1-3 is the pairing position of lead that is wound in the ribbon on the spool.In the framework shown in said Fig. 1, outwards being drawn by said the 3rd wall 1-4 inside top of ribbon is so said internal tooth section 1-3 is arranged at the two through hole top.
On said framework 1, also be provided with other structure, for example interface of the strengthening rib of the lightening hole on the two side, connection two side or the like is given unnecessary details here no longer one by one.
Please referring to Fig. 2,3 and 4, wherein, Fig. 2 is the structural representation of the spool among Fig. 1; Fig. 3 is that Fig. 2 is along the axial cutaway view of spool; Fig. 4 is the exploded view of spool and torsion bar assembling.Said spool 2 comprises mandrel 2-1 and the separable end cap that is arranged at said mandrel 2-1 two ends: left side end cap 2-2a and right side end cap 2-2b.Said mandrel 2-1 is used to twine belt-strap, and it can twine ribbon on it along its axis rotation and maybe the ribbon that twines discharged.Said mandrel is provided with through hole 2-3 along its axis, and through hole 2-3 inwall is provided with internal tooth.
On the both ends of the surface of said mandrel 2-1, be provided with two outwardly directed pin 2-6 respectively, be called force limit pin 2-6.
On said mandrel 2-1, also be provided with and be used to pass and fixedly the prolate type hold down groove 2-4 of ribbon end and the loss of weight groove 2-5 that is used for loss of weight.
The periphery of said two end cap is provided with external tooth; As shown in Figure 4; Left side end cap 2-2a periphery is provided with external tooth 2-2a-1, and the periphery of end cap 2-2b is provided with external toothing 2-2b-1 on the right side, and the tooth on the said two end cap is unidirectional tooth; The internal tooth section of two through hole matches on the mandrel 2-1 rotation direction when ribbon discharges, the external tooth of said two end cap periphery and said framework 1.
In said two end cap position corresponding to said force limit pin on the end face of mandrel 2-1, also be provided with pin-and-hole, the pin-and-hole 2-2b-2 on the right side end cap 2-2b as shown in Figure 4.When at both ends lid mode as shown in Figure 2 was arranged at said mandrel 2-1 both ends of the surface side, force limit pin inserted in the corresponding pin-and-hole.In addition, also can force limit pin be arranged at the end cap inboard, and pin-and-hole be set in mandrel 2-1 end face relevant position.Said force limit pin can be different in the position that is provided with at mandrel two ends, and location when being used in end cap and mandrel 2-1 assembling whereby prevents left and right sides end cap loading error.Prior aspect is, the shearing force when this force limit pin 2-6 can also bear the mandrel rotation, and when this shearing force reaches a threshold value, be cut off.
Also be provided with the center shrinkage pool (hereinafter to be referred as shrinkage pool) of being with internal tooth, the shrinkage pool 2-2b-3 on the right side end cap 2-2b as shown in Figure 4 towards the end face center of mandrel 2-1 in said two end cap.In the present embodiment, the shrinkage pool of two end cap is arranged on the boss that stretches out its place end face side.Corresponding mandrel end face then is provided with the seam that holds this boss.
The end face in the outside of said two end cap (promptly away from mandrel 2-1 end face) side is provided with outwardly directed projecting shaft along the center of this end face.Right side projecting shaft 2-2b-5 as shown in fig. 1 and left side projecting shaft 2-2a-5 as shown in Figure 4.Wherein, left side projecting shaft 2-2a-5 is connected with end instr, and right side projecting shaft 2-2b-5 periphery is provided with tooth, is connected with wind spring.
When the torsion bar that uses present embodiment is in retractor spool; Torsion bar 3 (comprising first section 3a and second section 3b) and said spool 2 structures are like Fig. 2, shown in 3 and 4; Torsion bar 3 is inserted through among the through hole 2-3 of said mandrel 2-1, and the external tooth at its axial middle part is meshed with the internal tooth of the through hole 2-3 inwall setting of said mandrel 2-1.Left side end cap 2-2a and right side end cap 2-2b are covered in the both ends of mandrel 2-1 respectively from the left and right sides, and the force limit pin of relevant position is corresponding with pin-and-hole.Insert respectively among the shrinkage pool of said left and right sides end cap at the two ends of said torsion bar 3, and its end external tooth is meshed with the internal tooth of corresponding shrinkage pool.In the present embodiment, as shown in Figure 4, between the seam of the boss of said two end cap and mandrel 2-1, also be provided with wear ring (figure does not show).This wear ring (figure does not show) generally adopts low-friction plastic to process; The seam position that cooperates between can the opposing end surface for end cap 2-2 and mandrel 2-1 provides transition; The metal covering that makes the seam position can direct contact, has avoided gummed effect that the mutual friction of metal covering phase the causes influence to the torsion bar normal operation.
As shown in Figure 4, the inboard outer of end cap is provided with annular boss (the annular boss 2-2b-6 that the right-hand end shown in Fig. 4 covers), is provided with the seam of dodging that matches with annular boss in the end face relevant position of said mandrel 2-1; Frictional area when rotating relatively through annular boss being set and dodging fixing structure, can reducing mandrel 2-1 end face and end cap, thus the friction force between mandrel and the end cap reduced, improve the stability of limit power effect.
Said spool 2 is wholy set among the said framework 1, and two end cap places respectively among the through hole of framework 1 sidewall on the spool 2.During free state, said spool 2 rotatable floating are arranged among the said taking-up device framework 1, and the internal tooth of through hole does not contact on the external tooth on its end cap and the taking-up device framework 1.Spool 2 is supported by the projecting shaft in its outside, end cap two ends, and spool 2 can freely rotate, and realizes the winding and the release of ribbon.And in when locking, the relevant position internal tooth is meshed on the external tooth of said spool 2 two end cap and the said framework 1, and spool 2 can't rotate.
In the taking-up device of present embodiment, the two ends of its torsion bar 3 are arranged at the two end cap place of spool, and do not pass end cap, with respect to the torsion bar in the background technology, and the torsion bar contraction in length of present embodiment.The projecting shaft that the part that is shortened is set at the end cap outside replaces.When bumping, ribbon drives said mandrel rotation, and then drives the torsion bar rotation.And two end cap is locked on the framework, and two end cap meshes the both ends of torsion bar simultaneously, makes the both ends of torsion bar to rotate.And torsion bar 3 middle parts make its pulling force that bears ribbon through the circumferential external tooth at middle part and the internal gearing of mandrel 2-1, and both ends are then owing to the gear meshing relation of end external tooth and end cap 2-2 inner end surface is fixed; When the pulling force of ribbon reaches certain degree; The deformation that twists of this torsion bar 3; Thereby make mandrel 2-1 that the rotation of certain angle take place, the release portion ribbon, the torsional deformation characteristic of this torsion bar 3 can suitably be emitted ribbon; Make ribbon be controlled at a reservation value, avoided the damage of excessive binding force human body to the binding force of human body; Simultaneously, ribbon can not be emitted long distance again and caused the inefficacy to the human body constraint.
In the present embodiment; Because the torsion bar contraction in length, and the seam setting of inboard boss of end cap and mandrel, it only bears the application force that comes from mandrel and the antagonistic force of end cap; Avoid torsion bar directly to bear the ribbon tractive force; Thereby its force-bearing situation is simple and controlled, can design as required and satisfy the force limit pin that limit power requires, and its safety and stability in use.In addition, the torsion bar stage casing is reversed, and is easier to produce well-distributed distortion, avoids the too high and fracture failure of local stress; Simultaneously, the left and right sides is born half the limit power value respectively, can reduce the required diameter of torsion bar.Because the material of torsion bar need satisfy special torsion requirement, its cost is high, makes and requires height, adopts short torsion bar can obviously practice thrift cost in the present embodiment.
In addition, in the above embodiment of the present invention, internal tooth section 1-3 is set on the through hole of said taking-up device framework, and the position of internal tooth section 1-3 is the pairing position of lead that is wound in the ribbon on the spool.Put in order the structure that circle all is provided with internal tooth with respect to through hole, the structure of present embodiment can guarantee that spool is locked in definite position when locking, and the position of internal tooth section 1-3 promptly is set.
Secondly; In the embodiments of the invention; The force limit pin 2-6 that is provided with at the mandrel two ends of said spool 2 as stated, when spool 2 lockup states, mandrel 2-1 is owing to receive the pulling force from belt-strap; Can produce rotation trend by relative both sides end cap, and the external tooth 3-1 at said force limit pin 2-6 and torsion bar 3 middle parts can stop its rotation.Force limit pin 2-6 receives the shearing force of end cap and mandrel 2-1.When bumping, there is the tractive force loading procedure that changes from small to big rapidly in the ribbon tractive force.In this process, when tractive force less than force limit pin 2-6 bear threshold value the time, the tractive force that said mandrel 2-1 is born is carried on the force limit pin 2-6, this tractive force is not born or mainly do not born to said torsion bar 3; When this value of thrust increase to above force limit pin 2-6 bear threshold value the time, force limit pin 2-6 will fracture, the tractive force of the ribbon that transmits through mandrel 2-1 is born in torsion bar 3 beginning fully, and then the torsional deflection process of torsion bar 3 just can take place.So limit power threshold value that force limit pin 2-6 can regulate this safety strap.
In the present embodiment, the external tooth at said torsion bar 3 middle parts is provided with the hypodontia mouth, is called to dodge tooth and lack; The tooth of dodging on first section 3a right side as shown in Figure 5 lacks 3a-2-1.Figure 10 dodges the scarce 3a-2-1 of tooth for the middle part external tooth has torsion bar inserts the scheme drawing that its outer toothed portion matches with the mandrel through hole among the mandrel 2-1.Can find out by Figure 10; The said tooth of dodging lacks 3a-2-1 after the position that is provided with on the torsion bar 3 is satisfied this torsion bar 3 and inserted the through hole of mandrel 2-1, dodges that tooth lacks that 3-1-1 aims at or rough alignment mandrel 2-1 goes up that being used to of being provided with passes and the fixing hold down groove 2-4 of ribbon 6.This hold down groove 2-4 is a prolate type through hole, and it is provided with and satisfies ribbon and pass the center shaft of direction perpendicular to said mandrel 2-1, and needs as much as possible near said center shaft.Saidly dodge tooth to lack 3-1-1 be that ribbon 6 passes hold down groove 2-4 and provides and let bit space; Cause ribbon 6 and this interference of tooth to avoid teeth being set at this place; And cause ribbon 6 at this place away from mandrel 2-1 line of centers, and be unfavorable for ribbon 6 when tension mandrel 2-1 stable.
Shown in Fig. 6 is the end profile of tooth of first section 3a left end of torsion bar 3a-1 shown in Figure 5, and Fig. 7 shows the cooperation figure that torsion bar 3 left end 3a-1 insert the shrinkage pool of left side end cap 2-2a; Fig. 8 is the end profile of tooth of first section 3a right-hand end of torsion bar 3a-2 shown in Figure 5, can see that the tooth of dodging that its end is provided with lacks 3a-2-1, and Fig. 9 shows the cooperation figure that torsion bar 3 right-hand end 3a-2 insert the shrinkage pool of mandrel 2-1.
In the present embodiment; Torsion bar is set to discrete two sections and has following effect: can the torsion bar section combination of two same diameter or different-diameter be used; Capable of being combinedly go out a plurality of limit power values; Thereby can adopt less torsion bar to form taking-up device, satisfy the demands of different of different automobile vendors safety strap limit power value with a plurality of limit power values.Show the scheme drawing of different-diameter torsion bar Duan Zuwei torsion bar like Figure 11.In addition, also can use the torsion bar combination of identical material or unlike material to use, can obtain different limit power effects equally.
In addition, because torsion bar is to adopt special substance and process through cold heading technique, for the torsion bar of each diameter, all independent mould will be arranged, its manufacturing equipment and mould are expensive.Adopt the two sectional type torsion bar of present embodiment, can realize that the torsion bar section that limited processing mold processes is combined into the torsion bar with a plurality of limit power values, thereby can reduce die sinking quantity, practice thrift manufacturing cost.And the torsion bar of shorter size is more convenient for processing, and passing rate of processing is higher, and the cost of each mould is also lower relatively.
In addition, the material that changes the torsion bar section can be used with the change diameter simultaneously, to be combined into more changeableization.Here repeat no more.
The present invention also protects a kind of Webbing retractor, and this Webbing retractor has used the torsion bar of the foregoing description.Be applied to the ins and outs in the taking-up device about torsion bar, the concrete structure of this taking-up device can be referring to the top embodiment that torsion bar is described.Here no longer be repeated in this description.
The present invention also protects a kind of safety strap assembly, and this safety strap assembly has used the said taking-up device of the foregoing description, and can obtain the beneficial effect that taking-up device brought of the foregoing description.Taking-up device can no longer launch to discuss referring to existing technology with the assembling of ribbon and other relevant spare and accessory parts here.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (5)
1. torsion bar that is used for Webbing retractor; Said Webbing retractor comprises taking-up device framework and spool; Said spool comprises the mandrel that is provided with through hole along the axis and is used to twine ribbon, and separable two end caps that are arranged at the mandrel two ends respectively; Said end cap is provided with the center shrinkage pool of band internal tooth towards the center of the inner end surface of mandrel; The middle section position of the through hole of position, said mandrel axis is provided with internal tooth; It is characterized in that:
Said torsion bar is shaft-like, and its length vertically is not more than the axial length of said spool; Be provided with circumferential external tooth at said torsion bar both ends and middle part; And the center shrinkage pool internal tooth of the two end cap end face on the external tooth that is positioned at the torsion bar both ends and the taking-up device matches, and the circumferential external tooth that is positioned at the torsion bar middle part matches with the internal tooth of the middle section position setting of the through hole of position, said mandrel axis;
Wherein, the two sectional type structure of said torsion bar for separating from axial middle part; The said circumferential external tooth that is arranged on the middle part promptly is positioned at two sections ends that connect.
2. the torsion bar that is used for Webbing retractor according to claim 1 is characterized in that, two sections of said torsion bar have different diameters and/or different materials respectively.
3. the torsion bar that is used for Webbing retractor according to claim 1; It is characterized in that: all be provided with on the circumferential external tooth of two sections the end that connects of said torsion bar and dodge hypodontia, and two to dodge position that tooth lacks identical and jointly corresponding to passing on the mandrel and the fixing hold down groove of ribbon end.
4. a Webbing retractor is characterized in that, comprises, taking-up device framework, spool and aforesaid right require 1 to 3 arbitrary described torsion bar; Wherein,
Said taking-up device framework comprises two relative sidewalls; Opposite position is provided with the circular port of band internal tooth in said two side;
Said spool comprises the mandrel that is provided with through hole along the axis and is used to twine ribbon, and separable two end caps that are arranged at the mandrel two ends respectively; End cap is provided with external tooth along periphery, and towards the center of the inner end surface of mandrel the center shrinkage pool of band internal tooth is set; The middle section position of the through hole of position, said mandrel axis is provided with internal tooth;
Said torsion bar passes the through hole of said mandrel, and the external tooth at middle part is meshed with the internal tooth of mandrel through-hole wall; Insert respectively among the center shrinkage pool of said spool two end cap at said torsion bar two ends, and the external tooth at two ends is meshed with the internal tooth of the center shrinkage pool of said end cap inner end surface; This torsion bar has stable ductility in circumferential distortion;
Under free state, rotatable the floating of said spool is arranged in the said taking-up device framework, and two end cap places the circular port of the two side of said taking-up device framework; When locking, the external tooth of said spool two end cap is meshed with internal tooth on the said framework.
5. a safety strap assembly is characterized in that, uses aforesaid right to require 4 described taking-up devices.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210308979.XA CN102837663B (en) | 2012-08-27 | 2012-08-27 | For torsion bar and Webbing retractor, the safety strap assembly of Webbing retractor |
| 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 |
|---|---|---|---|
| CN201210308979.XA CN102837663B (en) | 2012-08-27 | 2012-08-27 | For torsion bar and Webbing retractor, the safety strap assembly of Webbing retractor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102837663A true CN102837663A (en) | 2012-12-26 |
| CN102837663B CN102837663B (en) | 2016-03-02 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210308979.XA Expired - Fee Related CN102837663B (en) | 2012-08-27 | 2012-08-27 | For torsion bar and Webbing retractor, the safety strap assembly of Webbing retractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102837663B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103963737A (en) * | 2013-01-29 | 2014-08-06 | 上海和励信息科技有限公司 | Safety belt winder, end cap, annular tooth ring and safety belt assembly |
| CN112437732A (en) * | 2018-07-26 | 2021-03-02 | 奥托立夫开发公司 | Belt retractor with force limiting and separating device |
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| JP2008174049A (en) * | 2007-01-17 | 2008-07-31 | Autoliv Development Ab | Seat belt retractor |
| US20110121120A1 (en) * | 2009-11-20 | 2011-05-26 | Autoliv Development Ab | Seat belt retractor |
| CN202743195U (en) * | 2012-08-27 | 2013-02-20 | 上海和励信息科技有限公司 | Torsion rod for safety belt winder, safety belt winder and safety belt assembly |
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| US6012667A (en) * | 1998-02-19 | 2000-01-11 | Breed Automotive Technology Inc. | Multi-level load limiting torsion bar retractor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103963737A (en) * | 2013-01-29 | 2014-08-06 | 上海和励信息科技有限公司 | Safety belt winder, end cap, annular tooth ring and safety belt assembly |
| CN112437732A (en) * | 2018-07-26 | 2021-03-02 | 奥托立夫开发公司 | Belt retractor with force limiting and separating device |
| CN112437732B (en) * | 2018-07-26 | 2023-01-31 | 奥托立夫开发公司 | Belt retractor with force limiting and separating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102837663B (en) | 2016-03-02 |
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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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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: Torsion bar for safety belt retractor, safety belt retractor and safety belt assembly Granted publication date: 20160302 License type: Common License Record date: 20181207 |
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