CN104760567B - Safety belt winding device - Google Patents

Abstract

The invention provides a safety belt winding device, comprising a winding shaft, a motor and a clutch. The clutch comprises a gear, a rotor, a locking lever, a holding part, a ring and a gasket. The rotor comprises a main body portion and a flange portion which is arranged on one side of the main body portion and protrudes outwards radially. The end face of one side of the gear is in sliding contact with the flange. The ring is provided with an outer cover portion which presses the gear and elastic claws which are arranged on the inner side of the outer cover portion in the circumferential direction. The elastic claws are abutted between the gear and the rotor so as to transmit rotation of the gear to the rotor. A peripheral portion of the gasket presses the outer cover portion of the ring. The gasket is in sealing contact with the main body portion of the rotor, so that a confined space is formed among the gear, the rotor and the gasket. According to the invention, metal powder produced by the friction between the elastic claws and the rotor are sealed in the confined space, and is not spread to the whole clutch mechanism, so that the condition that transmission and the service life of the clutch are influenced by the metal powder is avoided, and therefore the service life of the clutch is prolonged.

Description

Webbing take-up device

Technical field

The invention belongs to seat belt device for vehicle technical field, more particularly to a kind of Webbing take-up device.

Background technology

Seat belt device for vehicle is the critically important protection device of one of vehicle, collides or emergency brake in vehicle When car, seat belt device for vehicle can constrain occupant, it is to avoid occupant upsprings from seat.And Webbing take-up device It is the most important part in seat belt device for vehicle again.

Webbing take-up device carries out the folding and unfolding of ribbon by the rotation of wireline reel, thus realizing belt restraints effect Triggering and disconnection action.

Because the occupant on vehicle is fastening seat belts（Hereinafter referred to as ribbon）Afterwards, ribbon be relative relaxation be attached to human body On, therefore, when there is emergency to reduce vehicle（As before occurring to collision）The pull-out amount of ribbon, present safety Tape winding apparatus, in addition to possessing the mechanical sensing type locking system of routine, generally also includes one and is used for the pre- of ribbon pretension Take-up device, pre-tightening apparatus are typically autonomous working with mechanical sensing type locking system.

The Chinese patent application of Publication No. CN1894123 discloses a kind of Webbing take-up device, in this safety belt volume Pyrotechnic pretension apparatus are employed in winding apparatus.In case of emergency（For example occur before to collision）, pyrotechnic pretension Gas generating unit in device is ignited, and the gas push tooth bar motion producing in the cylinder, so that be connected with tooth bar Gear rotation（To the rotation of ribbon coiling direction）, after gear rotation, script is contained in convex in the groove on gear by gear Portion（It is arranged on friction plate）Push the inwall of integral cartridge to（Annular knurl face）Produce friction, because sleeve passes through limiter axle and volume It is fixedly connected around axle, thus, the conversion of motion of tooth bar is rotation on ribbon coiling direction for the wireline reel the most at last, and then can Before mechanical sensing type locking system is by wireline reel locking, eliminates the lax of ribbon with user, which reduce ribbon Pull-out amount, improve security.

In addition, the Chinese patent application in Publication No. CN1676380 discloses a kind of tape winding apparatus, in this tape wrapping Electric motor type pretension apparatus are employed in device.In case of emergency（For example pass through detections of radar arrive will occur front to touching Hit）, motor（Motor）Rotation, and will be rotated by the clutch of a mechanically single-direction transmission between motor and wireline reel Pass to wireline reel, make winding axial direction ribbon coiling direction rotation, thus, the translating rotation of motor is wireline reel around knitting the most at last Rotation on tape wrapping direction, and then user's body can be eliminated before mechanical sensing type locking system is by wireline reel locking Upper ribbon lax, it is also possible to reduce the pull-out amount of ribbon.

Tape winding apparatus disclosed in CN1676380 includes wireline reel, motor and clutch, and wireline reel can wind and pull out it The ribbon for fettering passenger of upper winding, clutch mechanism ground is between motor and wireline reel, and the rotation of motor is passed Pass wireline reel, make the coiling direction rotation of the axial described ribbon of winding, the biography of the produced rotation in cut-out wireline reel side simultaneously Pass, to prevent rotation produced by wireline reel side from passing to motor.

As shown in Figures 10 and 11, its clutch of tape winding apparatus disclosed in CN1676380 includes following part：

Housing（Including clutch housing 101a and clutch enclosing cover 102a）；

Relatively described wireline reel is coaxially disposed, the gear 116a transmitting the rotation of described motor and rotating, described gear 116a has circumferential load-bearing part 120a；

The rotor 124a being coaxially disposed with described gear 116a, the periphery of rotor is formed with external tooth 130a；

Be maintained on housing by frictional force and can relative rotor 124a relative movement within a predetermined range a pair of slide block 144a；

It is arranged on the securing rod 154a on described rotor 124a, described securing rod 154a is always pushed to and institute by a torsion spring 164a State the direction of wireline reel combination, and be generally maintained at by described slide block 144a and release on position with the combination of described wireline reel, When described rotor 124a rotates to the coiling direction of ribbon, described securing rod 154a leaves described slide block 144a and moves, and releases The described state being kept, is combined with described wireline reel in the presence of described thrust, by described rotor 124a to described band The rotation of coiling direction passes to described wireline reel, and allow described wireline reel with respect to winding side from described rotor to described band To rotating against；When described rotor 124a rotates to the pull-out direction of described band, described securing rod 154a is close to described slide block 144a moves, and described slide block 144a makes described securing rod 154a move and be maintained at described combination to release on position；

Be arranged on the ring 176a of the side of axis direction of described rotor 124a, described ring 176a have outer cap 178a and It is circumferentially disposed at the elastic claw 182a between described gear 116a and the external tooth 130a of described rotor 124a, described outer cap Described gear 116a and described securing rod 154a is maintained on predetermined assembling position 178a, and described elastic claw 182a is integrally It is arranged in described outer cap 178a, described circumference load-bearing part 120a circumferentially bears and makees from described elastic claw 182a Load.When the load not less than predetermined value acts on described rotor 124a, elastic claw 182a and described rotor 124a External tooth 130a engaging, the rotation of described gear 116a is passed to described rotor 124a by described elastic claw 182a, pre- when exceeding When the load of definite value acts on described rotor 124a, described load cuts off the transmission of the rotation between described gear and rotor （Elastic claw 182a is no longer engaged with the external tooth 130a of described rotor 124a, and elastic claw 182a crosses external tooth 130a when rotated）, Described gear 116a is made can relative to dally with described rotor 124a, because described elastic claw 182a is integrally formed in described ring On 176a, and then described ring 176a is made to be maintained on described rotor 124a by elastic force（Only contact does not engage）.

Connect the pair of slide block 144a and make the pair of slide block 144a keep synchronous pad 184a, pad 184a to set Put between clutch enclosing cover 102a and ring 176a.

Above-mentioned clutch, ring 176a is metal material, when the overload occurs, elastic claw with the external tooth 130 of rotor 182a idle running relative with rotor 124a, elastic claw 182a occurs friction can produce substantial amounts of metal powder with the external tooth 130a of rotor End.Simultaneously as outer cap 178a of ring 176a is to fit tightly with the upper surface of rotor 124a, so, ring 176a's is outer Rub between the upper surface of cap 178a and rotor 124a and also can produce substantial amounts of metal dust.

As can be seen from Figure 11, above-mentioned clutch is although be provided with pad between clutch enclosing cover 102a and ring 176a 184a, and pad 184a and clutch enclosing cover 102a sliding contact, but pad 184a does not have sealing function, thus elastic claw The metal dust that the external tooth 130a friction of 182a and rotor produces is understood splashes and is deposited in whole clutch.Meanwhile, by Outer cap 178a in ring 176a is extended from elastic claw 182a to inner side（I.e. elastic claw 182a is formed at described outer cap 178a The outside of circumferencial direction）, thus outer cap 178a can not cover the teeth groove of the external tooth 130a of rotor, thus the outer cap of ring 176a Rub between the upper surface of 178a and rotor 124a generation metal dust also can splashes and be deposited in whole clutch.

The metal dust being deposited in clutch can have considerable influence to the transmission of clutch and service life.And, it is sliding Block 144a is maintained at described housing by frictional force（Clutch housing 101a and clutch enclosing cover 102a）On, metal dust enters and stops The respective rubbing surface of the slide 146a of moving plate 148a and slide block 144a can damage rubbing surface, so that the relative motion of slide block 144a is lost Effect, thus lead to whole clutch disabler.

Content of the invention

The technical problem to be solved is easily to deposit in its clutch of existing Webbing take-up device Metal dust and lead to the defect of whole clutch disabler, a kind of Webbing take-up device is provided.

The technical scheme that present invention solution above-mentioned technical problem is adopted is as follows：

There is provided a kind of Webbing take-up device, including wireline reel, motor and clutch, described wireline reel can wind and pull out The ribbon for fettering passenger being wound around thereon, described clutch mechanism ground between described motor and described wireline reel, and The rotation of described motor is passed to described wireline reel, makes the coiling direction rotation of the described ribbon of described winding axial direction, cut simultaneously The transmission of rotation produced by disconnected described wireline reel side, to prevent described rotation from passing to described motor；

Wherein, described clutch includes：

The gear being coaxially disposed relative to described wireline reel and transmitting described rotating of motor and rotate；

It is coaxially disposed and is contained in the rotor inside described gear with described gear, described rotor includes main part and sets Put in described main part side and to radially projecting flange portion, slided with described flange portion and connect in a side end face of described gear Touch；

It is arranged on the securing rod on described rotor；

Holding member, described securing rod is generally maintained at the combination releasing position with described wireline reel by described holding member On, when described rotor rotates around axis to the coiling direction of ribbon, described holding member makes described securing rod and described volume Combine around axle, the rotation of described rotor is passed to described wireline reel；When described rotor is around axis to ribbon pull-out direction During rotation, described holding member makes described securing rod move and is maintained at described combination to release on position；

It is arranged on the ring of the side of the axis direction of described rotor, described ring has the outer cap pushing down described gear and edge It is circumferentially provided on the elastic claw inside described outer cap, described elastic claw is connected between described gear and described rotor with by institute The rotation stating gear passes to described rotor, when the load exceeding predetermined value acts on described rotor, described load cut-out The transmission of the rotation between described gear and rotor, makes described gear can relative dally with described rotor.

It is arranged on the pad that the side contrary with described rotor of described ring and relative described wireline reel are coaxially disposed, institute The peripheral part stating pad is pressed in the outer cap of described ring, and described pad is hermetically contacted with the main part of described rotor, with Form a confined space between described gear, rotor and pad.

Further, the inner peripheral portion of described gear along its circumferentially-spaced form multiple circumference load-bearing part, described Circumferential load-bearing part circumferentially bears the load from the effect of described elastic claw.

Further, described clutch also includes the shell being made up of clutch housing and clutch enclosing cover.

Further, described holding member includes slide block and the flexible member being arranged on described rotor, described slide block quilt Frictional force keep on the housing thus can relatively described rotor relative movement within a predetermined range, when described rotor is to described During the coiling direction rotation of ribbon, described securing rod is mobile close to described slide block, and the state being kept described in releasing, described Be combined with described wireline reel under the thrust of slide block；When described rotor rotates to the pull-out direction of described ribbon, described lock Fixed pole is with leaving described slide block mobile, and described flexible member makes described securing rod move to and is maintained at reference on releasing position.

Further, described clutch also includes the ratchet being integrally attached on described wireline reel, when described rotor to During the coiling direction rotation of described ribbon, described securing rod is mobile close to described slide block, the state being kept described in releasing, Be combined with described ratchet under the thrust of described slide block, and the rotation of the coiling direction to described ribbon is transmitted by described rotor To described ratchet, allow described ratchet to rotate against to the coiling direction of described ribbon with respect to described rotor simultaneously；When described Pull-out direction from rotor to described ribbon rotate when, described securing rod is with leaving described slide block mobile, and described flexible member makes institute State securing rod to move to and be maintained at reference on releasing position.

Further, the side of described slide block is equipped with slide, the side contrary with described slide on described slide block It is provided with locking plate, the middle body of described locking plate length direction embeds in the connecting hole being formed on described slide block, described The sliding surface being formed on described clutch housing is pushed down at the both ends of locking plate length direction respectively, and scheduled volume ground elasticity becomes Shape, so that the slide of described slide block pushes down described clutch enclosing cover.

Further, the one end in described bending of slide block direction is formed with press section, and described securing rod has to described cunning The connection sheet that the press section side of block projects, the leading section of described connection sheet forms ratchet corresponding with the external tooth of described ratchet, institute State the hole portion that ratchet is penetratingly formed on described rotor, and can engage with the described external tooth stating ratchet.

Further, described shim clip is between described ring and described clutch enclosing cover.

Further, the main part of described pad is provided with annular seal groove axially closer to the side of described rotor, Correspondingly, described armature spindle is formed with annular flange upwardly toward the side of described seal groove, and described flange snaps in described close In sealing groove, to form a confined space between described gear, rotor and pad.

Further, described clutch also include being coaxially disposed relative to described wireline reel and with described rotor rotate and The support of rotation, described support is arranged between described rotor and described clutch enclosing cover, and pushes down described rotor, holding simultaneously Part and securing rod.

According to the Webbing take-up device of the present invention, described ring has the outer cap pushing down described gear and circumferentially arranged Elastic claw inside described outer cap, and described elastic claw is connected between described gear and described rotor, i.e. described ring Outer cap be supported on gear, and not with rotor contact, thus, with respect to prior art, when overload occurs, described The outer cap of ring not with friction rotor（Friction between elastic claw and rotor is only had to produce metal dust）, thus decreasing generation Metal dust amount, that is, diffuse to whole clutch mechanism metal dust reduce, adds somewhat to clutch Service life.And, the peripheral part of pad is pressed in the outer cap of described ring, and pad is hermetically connect with the main part of rotor Touch, and then form a confined space between gear, rotor and pad.Rub between elastic claw and rotor the metal dust of generation It is closed in this confined space, without being diffused in whole clutch mechanism, it is to avoid the biography to clutch for the metal dust The dynamic impact with service life, extends the service life of clutch.

Brief description

Fig. 1 is the structural representation of the Webbing take-up device that one embodiment of the invention provides；

Fig. 2 is the structural representation of the Webbing take-up device after removing spring coiling mechanism and the shell of clutch in Fig. 1；

Fig. 3 is the parts exploded view of Fig. 1；

Fig. 4 is the exploded view of its clutch main body part of Webbing take-up device that one embodiment of the invention provides；

Fig. 5 is another visual angle figure of Fig. 4；

Fig. 6 is locked out bar and is maintained at the view being combined with ratchet on releasing position by leaf spring；

Fig. 7 is locked out the view that bar is combined under the thrust of slide block with ratchet；

Fig. 8 is the assembling schematic diagram of its support of Webbing take-up device that one embodiment of the invention provides；

Fig. 9 is the internal structure schematic diagram of its clutch of Webbing take-up device that one embodiment of the invention provides；

Figure 10 is a kind of exploded view of existing its clutch main body part of Webbing take-up device；

Figure 11 be a kind of existing its clutch of Webbing take-up device internal structure schematic diagram.

Reference in specification is as follows：

12nd, framework；14th, backboard；16th, the first gripper shoe；18th, the second gripper shoe；20th, wireline reel；21st, attachment screw；24、 Torque arm；44th, motor；100th, clutch；101st, clutch housing；102nd, clutch enclosing cover；104th, screw；106th, circular logical Hole；108th, sliding surface；110th, lining ring support sector；112nd, lining ring；114th, the main part of clutch；116th, gear；118th, worm gear Tooth；120th, circumferential load-bearing part；122nd, rotation stopper recess；42nd, spring coiling mechanism；5th, transmission device；51st, face gear；52nd, straight Gear；53rd, worm screw；54th, axle sleeve；55th, axle sleeve；124th, rotor；126th, the main part of rotor；128th, flange portion；130th, external tooth； 131st, round tube hole；132nd, receiving portion；133rd, support axle portion；134th, ratchet；135th, circular hole；136th, hook tooth；137th, guide pad； 138th, connecting hole；139th, flange；140th, packing ring；142nd, pilot hole；144th, slide block；145th, press section；146th, slide；148 stop Moving plate；150th, connecting portion；152nd, connecting hole；153rd, support shaft；154th, securing rod；155th, ratchet；156th, bearing portion；162nd, hole Portion；166th, card column；168th, connection sheet；170th, support；171st, location hole；172nd, the main part of support；173rd, circular hole；174th, lack Mouthful；175th, rotary supporting part；176th, ring；178th, outer cap；180th, rotation stop pawl；182nd, elastic claw；184th, pad；185th, seal Groove；186th, synchronization blocks；187th, circular hole；188th, the main part of pad；200th, confined space.

Specific embodiment

In order that technical problem solved by the invention, technical scheme and beneficial effect become more apparent, below in conjunction with Drawings and Examples, are described in further detail to the present invention.It should be appreciated that specific embodiment described herein is only In order to explain the present invention, it is not intended to limit the present invention.

Please with reference to Fig. 1 and Fig. 2, the Webbing take-up device 10 that one embodiment of the invention provides, including wireline reel 20, Spring coiling mechanism 42, motor 44 and clutch 100, described wireline reel 20 can wind and pull out be wound around thereon for fettering passenger's Ribbon, described clutch 100 is mechanically between described motor 44 and described wireline reel, and the rotation of described motor 44 is passed Pass described wireline reel 20, make the coiling direction rotation to described ribbon for the described wireline reel 20, cut off described wireline reel 20 simultaneously The transmission of the produced rotation in side, to prevent described rotation from passing to described motor 44.Spring coiling mechanism 42 is arranged on described clutch The outside of device 100.Spring coiling mechanism 42 is conventional part, is not stating herein.

As shown in Fig. 2 Webbing take-up device carries framework 12, framework 12 is by generally plate like backboard 14, from this backboard The first gripper shoe 16 and the second gripper shoe 18 that the two ends of 14 width are integrally stretched out, backboard 14 is bolted on car With, thus framework 12 is arranged on vehicle body.

Can be rotatably set in the first gripper shoe 16 and second of framework 12 with the wireline reel 20 that the materials such as mold part make Between gripper shoe 18.The overall one-tenth cydariform of wireline reel 20, and the base end part of the ribbon forming bar-shape that is connected.If made Wireline reel 20 is layeredly rolled up to the coiling direction rotation around its axis, ribbon from its base end part to the peripheral part of wireline reel 20 Around；On the other hand, if making wireline reel 20 to the pull-out direction rotation around its axis, ribbon is drawn out.

The second gripper shoe 18 prominent to the outside of framework 12 is run through in one end of wireline reel 20.The unshowned machinery of in figure passes Sense formula locking device is arranged on the side of the second gripper shoe 18.This mechanical sensing type locking device comprises acceleration transducer, should Acceleration transducer and the lockplate being erected between the first gripper shoe 16 and the second gripper shoe 18 and be arranged on wireline reel 20 The torque arm 24 at shaft core position is connected.During vehicle emergency deceleration, by means of the action of locking mechanism, torsion is constrained by lockplate One end of bar, absorbs power, stops wireline reel 20 from rotating to pull-out direction simultaneously.

In addition, the other end of wireline reel 20 runs through the first gripper shoe 16 prominent to the outside of framework 12.Form hexagon prism The attachment screw 21 of shape is coaxial and formation is integratedly connected with the other end of this wireline reel 20.

As shown in Figures 1 to 9, in the present embodiment, described clutch 100 includes shell and is contained in the main part in shell Divide 114, described main part 114 includes gear 116, rotor 124, securing rod 154, holding member, ring 176, support 170, pad The parts such as piece 184, lining ring 112 and ratchet 134.

In the present embodiment, shell is made up of clutch housing 101 and clutch enclosing cover 102.This clutch housing 101 is by gold Belong to material（Such as aluminium alloy）Form box like, and to the direction opening contrary with the first gripper shoe 16.This clutch enclosing cover 102 by Metal material（Such as steel or iron）Form tabular, this clutch enclosing cover 102 is arranged on the open side of clutch housing 101.Above-mentioned Clutch housing 101 and clutch enclosing cover 102 are integrally attached in the first gripper shoe 16 by screw 104.

The middle position of clutch housing 101 diapire is formed with the manhole 106 coaxial with wireline reel 20.Attachment screw 21 run through this manhole 106.And, the peripheral part of this manhole 106 is dashed forward to the direction contrary with the first gripper shoe 16 Go out to be formed the sliding surface 108 of ring-type.And then, form lining ring support sector 110 to the direction contrary with the first gripper shoe 16.By resin The lining ring 112 that material etc. forms ring-type is supported in this lining ring support sector 110.

In the present embodiment, gear 116 forms ring-type by resin material etc., and its relatively described wireline reel 20 is coaxially disposed simultaneously Transmit the rotation of described motor 44 and rotate, the peripheral part of gear 116 is formed with worm-gear toothing 118.In the inner peripheral portion of gear 116, Circumferentially-spaced form multiple circumference load-bearing part 120 along it.These circumferential load-bearing part 120 and ring described later 176 elastic claw 182 is corresponding.And, on the end face of the side of the axis direction of gear 116, along its circumferentially-spaced landform Become multiple rotation stopper recess 122.These rotation stopper recess 122 are corresponding with rotation stop pawl 180 described later.

As shown in Figures 2 and 3, the transmission device 5 for the rotation of motor 44 is transferred to gear 116 is arranged on clutch The inside of housing 101, this transmission device 5 includes face gear 51 and the described end being connected on the output shaft of described motor 44 The worm screw 53 that the spur gear 52 of face gear 51 engagement is connected with described spur gear 52.Described gear 116 is wrom tooth wheel, described snail Bar 53 is engaged with the worm-gear toothing 118 of described gear 116.Described worm screw 53 is by being fixedly installed in clutch housing 101 Axle sleeve 54,55 is supported in clutch housing 101.Certainly, face gear 51 can also be bored by two with combining of spur gear 52 Gear substitutes.

By metal material etc.（Such as aluminium alloy）Form discoid rotor 124, be coaxially disposed with described gear 116 and It is contained in the inner side of described gear 116.Rotor 124 includes the main part 126 of cylindrical shape and is arranged on described main part 126 side And to radially projecting flange portion 128.The peripheral part of described main part 126 equally spacedly forms multiple external tooths 130 along its circumference, One side end face of described gear 116 and the sliding contact of described flange portion 128.The cross sectional shape of each external tooth 130 is trapezoidal.Each external tooth 130 is corresponding with the elastic claw of ring 176 described later.

The middle position of main part 126 diapire is formed with and is coaxial therewith and substantially cylindrical receiving portion 132, described appearance Receive the side of portion 132 axis direction（The direction of arrow A in Fig. 4 and Fig. 5）Coaxially it is equipped with the support axle portion 133 of a ring-type, The central authorities of this support axle portion are formed with round tube hole 131.This support axle portion 133 passes through the rotary supporting part 175 of support 170 described later Rotatably it is formed on the circular hole 135 of clutch enclosing cover 102.Aforesaid lining ring 112 rotatably with receiving portion The opposite side of 132 axis direction（The direction of arrow B in Fig. 4 and Fig. 5）Engagement, the opposite side of the axis direction of receiving portion 132 Rotatably it is supported on clutch housing 101 by lining ring 112.Thus, main part 126（Or rotor 124）Can be around The axis rotation of oneself.

It is contained in the receiving portion 132 of this main part 126 by the substantially a ring-shaped ratchet 134 that iron plate etc. is formed.In ratchet 134 peripheral part is formed with hook tooth 136.It is hexagonal connecting hole 138 in the shaft core portion Formation cross-section of ratchet 134, front State in the state of attachment screw 21 runs through, its axis is rotatably overall relatively（Relatively unrotatable）Connect.Thus, ratchet 134 Can integratedly be rotated by attachment screw 21 with wireline reel 20.

In addition, the side of ratchet 134 axis direction（Arrow B direction in Fig. 4 and Fig. 5）Slidably contact with aforementioned lining ring 112.The packing ring 140 being made up of resin material etc. is arranged on the opposite side of ratchet 134 axis direction（Arrow A in Fig. 4 and Fig. 5 Direction）.This packing ring 140 slidably contacts with the ring-type diapire of receiving portion 132, thus, can limit along ratchet 134 axis direction Displacement.

In addition, being formed along the circumferential skewing of main part 126 on the radial outside of receiving portion 132, the diapire of main part 126 A pair of pilot hole 142.Slide to be provided with respectively in each pilot hole 142 and be made up of resin material etc. and the circumference along main part 126 Bend to substantially block slide block 144.Above-mentioned a pair of slide block 144 is by the outer peripheral face of the inner peripheral surface of main part 126 and receiving portion 132 Maintain, this slide block 144 can be with respect to main part 126 in the preset range along pilot hole 142（Rotor 124）Relative movement.

The side of each slide block 144（Arrow A direction in Fig. 4 and Fig. 5）It is equipped with slide 146, this slide 146 is as schemed Clutch enclosing cover 102 is contacted shown in 9.And, the side that the slide 146 of each slide block 144 is contrary is provided with locking plate 148. Locking plate 148 is bent into smooth > font by the sheet metal having resilient narrower width（Its middle body gently bends）. The connecting portion 150 being arranged on the length direction middle body of locking plate 148 embeds the connecting hole 152 being formed on slide block 144, from And this locking plate 148 and slide block 144 link into an integrated entity, meanwhile, the both ends of the length direction of locking plate 148 push down respectively aforementioned The sliding surface 108 of clutch housing 101, and scheduled volume ground elastic deformation.

Therefore, in the presence of the elastic force of locking plate 148, the slide 146 of slide block 144 pushes down clutch enclosing cover 102, To slide block 144 along pilot hole 142 movement（The relative movement of relative rotor 124）Apply predetermined frictional force.Therefore, once turning Son 124 rotation, by means of the frictional force at the length direction both ends acting on slide 146 and locking plate 148, slide block 144 is temporary When be maintained at shell（Clutch housing 101 and clutch enclosing cover 102）On, and relative rotor 124 can be along pilot hole 142 Relative movement in preset range.

Press section 145 is formed at the one end of each slide block 144 bending direction.Above-mentioned press section 145 respectively with a pair of locking Bar 154 is corresponding.

Each securing rod 154 forms gentle > font by iron plate etc., and is arranged on a side of each slide block 144 bending direction, Described securing rod 154 is always by a leaf spring 164（Flexible member）Push to release direction with the combination of described ratchet 134.Each securing rod 154 bearing portions 156 including ring-type, the both sides that this bearing portion 156 is located at axis direction are respectively formed with support shaft 153, main body It is provided with shrinkage pool on the diapire in portion 126（In figure does not indicate）.The side by axis direction for the bearing portion 156 of each securing rod 154 （Arrow B direction in Fig. 4 and Fig. 5）The cooperation of support shaft 153 and shrinkage pool be rotatably supported on the bottom of main part 126 On wall.Each securing rod 154 also has to press section 145 side of described slide block is prominent and company that form with described bearing portion Contact pin 168, generally described connection sheet 168 is combined releasing with described press section 145.The leading section of this connection sheet 168 formed with front State the corresponding ratchet 155 of external tooth 136 of ratchet 134, this ratchet 155 is penetratingly formed at the hole portion in the receiving portion 132 of rotor 124 162, and can engage with the external tooth 136 of aforementioned ratchet 134.

In addition, main part 126 diapire of rotor is to the side of axis direction（Arrow A direction in Fig. 4 and Fig. 5）Also formed There are guide pad 137 and card column 166, the pars intermedia of described leaf spring 164 is clipped in the bearing portion 156 of described securing rod and described guide pad Between 137, described leaf spring 164 is against the close described spine of the connection sheet 168 of described securing rod near one end of described ratchet 134 One side surface of wheel 134, the other end of described leaf spring 164 is fastened in described card column 166.So, described leaf spring 164 always to Extrapolation securing rod 154, that is, described securing rod 154 always pushed to release direction with the combination of described ratchet 134 by described leaf spring 164.

As shown in FIG. 6 and 7, rotor 124 opposing slider 144 is mobile, leads to securing rod 154 opposing slider 144 mobile simultaneously Within a predetermined range close to or away from.As shown in fig. 7, when described rotor 124 rotates around axis to the coiling direction of ribbon, Described securing rod 154 moves close to described slide block 144 ground, and described press section 145 is combined with described connection sheet 168, releases described The state being kept, the ratchet 155 of connection sheet 168 front end and the external tooth of ratchet 134 under the thrust of described slide block 144 136 engage so that securing rod 154 is combined with described wireline reel 20, and then by described rotor 124 around described axis to ribbon The rotation of coiling direction passes to described wireline reel 20；And, as shown in fig. 6, when described rotor 124 is around axis to ribbon During pull-out direction rotation, described securing rod 154 leaves the movement of described slide block 144 ground, the ratchet 155 of connection sheet 168 front end and spine The external tooth 136 of wheel 134 separates, and described connection sheet 168 is combined releasing with described press section 145, so that described securing rod 154 exists Move to and be maintained at described combination in the presence of described leaf spring 164 to release on position.

In the present embodiment, holding member is made up of above-mentioned slide block 144 and leaf spring 164.Certainly, in other embodiments, The leaf spring 164 of holding member can also be substituted by torsion spring.

The coaxial setting of the relatively described wireline reel 20 of support 170, rotates with rotor 124 and rotates.Described support 170 is permissible It is fixed as one with described rotor 124 by crimping or being clasped etc.（The present embodiment is crimping）, described securing rod 154 is limited Be scheduled between described support 170 and described rotor 124, after the completion of the assembling of described clutch 100, described rotor 124 with described Frame 170 keeps described securing rod 154 to be not fall off in any direction, when described rotor 124 is around axis to the winding of ribbon When direction rotates, described support 170 and described securing rod 154 rotate together with therewith, and described support 170 makes described securing rod 154 motion process occurs in described clutch 100 radially all the time.And, described support 170 is arranged on described rotor Between 124 and described clutch enclosing cover 102, rise and axially support and positioning action, described support 170 separates described rotor 124 He Described clutch enclosing cover 102 is it is ensured that smooth rotation within described clutch 100 for the described rotor 124.

Support 170 carries the main part 172 of ring-type, and the middle body of main part 172 is formed with circular hole 173, rotor 124 Axle portion 133 is supported to run through described circular hole 173, the hole edge department of circular hole 173 is to the side contrary with rotor 124（Clutch enclosing cover 102 Side）The rotary supporting part 175 being equipped with, the support axle portion 133 of rotor 124 passes through this rotary supporting part 175 rotatably It is supported in the circular hole 135 of clutch enclosing cover 102.

In addition, the peripheral part of main part 172 offers a pair of breach 174, the slide 146 of slide block 144 runs through this breach 174.

In addition, location hole 171 is provided with main part 172, the bearing portion 156 of described location hole 171 and each securing rod 154 The opposite side of axis direction（Arrow A direction in Fig. 4 and Fig. 5）Support shaft 153 grafting cooperation, to ensure securing rod 154 Axially position.And, as shown in figure 8, main part 172 pushes down rotor 124, leaf spring 164, slide block 144 and securing rod 154 simultaneously, To realize the axial limiting of rotor 124, leaf spring 164, slide block 144 and securing rod 154.

It is arranged on radial outside and the position of support 170 by the ring 176 that the resilient metal material of tool (such as SUS etc.) is made Side in the axis direction of rotor 124（Arrow A direction in Fig. 4 and Fig. 5）.Described ring 176 has pushes down described gear 116 Outer cap 178, be circumferentially disposed at the elastic claw 182 of described outer cap 178 inner side and whole in the inner peripheral portion of outer cap 178 Body ground is formed and the multiple rotation stop pawls 180 prominent to its radially inner side.These rotation stop pawls 180 are recessed with the rotation stop of aforesaid gears 116 Portion 122 engages.Thus, ring 176 opposed gear 116 is integrally connected in its circumferential direction.

Multiple elastic claws 182 compartment of terrain having resilient tabular is integrally provided in the inner peripheral portion of outer cap 178.Each bullet The base end part of property pawl 182 is connected with outer cap 178.The pars intermedia of the length direction of each elastic claw 182 is to outer cap 178 Radially inner side bends, and to the radial outside bending of outer cap 178, each elastic claw 182 entirety is along the week of outer cap 178 for its leading section To bending.

As shown in FIG. 6 and 7, between the external tooth 130 and the inner peripheral surface of gear 116 of rotor 124, along rotor 124 and tooth These elastic claws 182 circumferentially disposed of wheel 116, the elastic force of its own pushes its inboard portion the external tooth 130 of rotor 124 to.By This, ring 176 is generally held on rotor 124.

The Outboard Sections of each elastic claw 182 are connected with the inner peripheral surface of gear 116 respectively, and gear 116 passes through each elastic claw 182 It is supported on rotor 124.In this case, the outer cap 178 of ring 176 and the flange portion 128 of rotor 124 limit gear 116 Movement in axis direction.In this case, the main part 172 of support 170 can anti-limited slip block 144, securing rod 154 and leaf spring 164 come off from rotor 124, so that said structure part is maintained at predetermined assembling position.

And then, the leading section of each elastic claw 182 respectively enters the negative area of external tooth 130, a side of contact external tooth 130 Wall（Side wall along the radial parallel formation side of main part 126）.The base end part of each elastic claw 182 contacts aforesaid gears 116 Circumferential load-bearing part 120.Thus, each elastic claw 182 makes gear 116 its circumference integrated connection relative with rotor 124（Relatively Rotation is restricted）, thus during gear 116 rotation, gear 116 is integratedly rotated with rotor 124.

Now, gear 116 is to ribbon coiling direction（Arrow C direction in Fig. 6 and Fig. 7）Revolving force pass through circumferential load Bearing part 120 is delivered to the base end part of elastic claw 182, then the external tooth being delivered to rotor 124 from the leading section of elastic claw 182 130.Gear 116 passes through circumferential load-bearing part 120 and circumferentially bears the load from elastic claw 182.That is, gear 116 edge Its direction of rotation bears the load from elastic claw 182.

As described above, elastic claw 182 is that have resilient sheet metal.Therefore, relative by gear 116 relative rotor 124 Revolving force produced by rotation resists the elastic force of elastic claw 182（Thrust）If its size is enough from the negative area of external tooth 130 In extract the leading section of each elastic claw 182, then elastic claw 182 can release gear 116 and rotor 124 around the connection of axis.Cause And gear 116 can rotate against with rotor 124.

Gear 116 is to ribbon pull-out direction（Arrow D direction in Fig. 6 and Fig. 7）Revolving force passed by rotation stopper recess 122 It is delivered to the rotation stop pawl 180 of ring 176, then the external tooth 130 being delivered to rotor 124 from the leading section of the elastic claw 182 of ring 176.

In addition, outer cap 178 is in the outside of multiple external tooths 130 of rotor 124 and is not contacted with multiple external tooths 130, that is, Outer cap 178 will not produce friction with multiple external tooths 130 of rotor 124, thus, the product of metal dust is avoided on this position Raw.

It is arranged on the side contrary with rotor 124 of ring 176 by the pad 184 that resin material etc. forms ring-type.Pad 184 It is clipped between ring 176 and clutch enclosing cover 102, this pad 184 ring 176 relatively can not rotate against around its axis.This pad 184 can prevent the ring 176 that metal is made from directly sliding so that the relative clutch enclosing cover 102 of ring 176 is flat with clutch enclosing cover 102 Rotate against slidingly.

Pad 184 includes the main part 188 of ring-type, and the central portion of main part 188 is formed with the circular hole coaxial with rotor 124 187, described circular 187 hole edge department is oppositely arranged a pair of the synchronization blocks 186 corresponding to a pair of slide block, in described rotor 124 During around axis to the coiling direction of ribbon or pull-out direction rotation, a pair of the synchronization blocks 186 on pad 184 ensure the pair of The synchronization of slide block 144.

In addition, as shown in figure 9, the peripheral part of the main part 188 of pad 184 is pressed in the outer cap 178 of described ring 176, And pad 184 is provided with annular seal groove 185, correspondingly, the main part of described rotor axially closer to the side of rotor 124 The side of 126 axis directions（The A direction of arrow in Fig. 5 and Fig. 6）It is formed with the flange 139 of annular, described flange 139 snaps in institute State in seal groove 185.Due to the flange portion 128 of rotor and a side end face sliding contact of described gear 116（Fit tightly）, this Sample, just forms a confined space 200 between the inner peripheral surface of described gear 116, rotor 124 and pad 184.

When there is overload, the metal dust of the generation that rubs between the external tooth 130 of elastic claw 182 and rotor 124 is just closed In described confined space 200, without being diffused in whole clutch mechanism, it is to avoid the transmission to clutch for the metal dust With the impact of service life, extend the service life of clutch.

In addition, in other embodiments (not shown) or pad is provided with ring axially closer to the side of rotor The flange of shape, correspondingly, the side of the main part axis direction of described rotor is formed with the seal groove of annular, and described flange snaps in In described seal groove.Equally, form a confined space between the inner peripheral surface of described gear, rotor and pad.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (10)

1. a kind of Webbing take-up device, including wireline reel, motor and clutch, described wireline reel can wind and pull out and twine thereon Around the ribbon for fettering passenger, described clutch mechanism ground, and will be described between described motor and described wireline reel The rotation of motor passes to described wireline reel, makes the coiling direction rotation of the described ribbon of described winding axial direction, cuts off described simultaneously The transmission of the produced rotation in wireline reel side, to prevent described rotation from passing to described motor；

It is characterized in that, described clutch includes：

The gear being coaxially disposed relative to described wireline reel and transmitting described rotating of motor and rotate；

It is coaxially disposed and is contained in the rotor inside described gear with described gear, described rotor includes main part and is arranged on Described main part side and to radially projecting flange portion, a side end face of described gear and described flange portion sliding contact；

It is arranged on the securing rod on described rotor；

Holding member, described securing rod is generally maintained at by described holding member and releases on position with the combination of described wireline reel, When described rotor rotates around axis to the coiling direction of ribbon, described holding member makes described securing rod and described wireline reel In conjunction with the rotation of described rotor is passed to described wireline reel；When described rotor rotates around axis to ribbon pull-out direction When, described holding member makes described securing rod move and is maintained at described combination to release on position；

It is arranged on the ring of the side of the axis direction of described rotor, described ring has the outer cap pushing down described gear and circumferentially It is arranged on the elastic claw inside described outer cap, described elastic claw is connected between described gear and described rotor with by described tooth The rotation of wheel passes to described rotor, and when the load exceeding predetermined value acts on described rotor, described load cut-out is described The transmission of the rotation between gear and rotor, makes described gear can relative dally with described rotor；

It is arranged on the pad that the side contrary with described rotor of described ring and relative described wireline reel are coaxially disposed, described pad The peripheral part of piece is pressed in the outer cap of described ring, and described pad is hermetically contacted with the main part of described rotor, with institute State and between gear, rotor and pad, form a confined space.

2. Webbing take-up device according to claim 1 is it is characterised in that the inner peripheral portion of described gear is along between its circumference Form multiple circumference load-bearing part every ground, described circumference load-bearing part circumferentially bears from the effect of described elastic claw Load.

3. Webbing take-up device according to claim 1 is it is characterised in that described clutch is also included by bell housing Body and the shell of clutch enclosing cover composition.

4. Webbing take-up device according to claim 3 it is characterised in that described holding member include being arranged on described Slide block on rotor and flexible member, when described rotor rotates to the coiling direction of described ribbon, described securing rod is close to institute State that is with stating slide block mobile, being kept described in releasing, is combined with described wireline reel under the thrust of described slide block；Work as institute State pull-out direction from rotor to described ribbon rotate when, described securing rod is with leaving described slide block mobile, and described flexible member makes Described securing rod moves to and is maintained at reference on releasing position.

5. Webbing take-up device according to claim 4 is it is characterised in that described clutch also includes being integrally connected Ratchet on described wireline reel, when described rotor rotates to the coiling direction of described ribbon, described securing rod is close to described Slide block ground is mobile, the state being kept described in releasing, is combined with described ratchet under the thrust of described slide block, and will be described The rotation of the coiling direction to described ribbon for the rotor passes to described ratchet, allow simultaneously described ratchet with respect to described rotor to The coiling direction of described ribbon rotates against；When pull-out direction from described rotor to described ribbon rotate when, described securing rod from With opening described slide block mobile, described flexible member makes described securing rod move to and is maintained at reference on releasing position.

6. Webbing take-up device according to claim 5 is it is characterised in that the side of described slide block is equipped with slip Piece, on described slide block, the side contrary with described slide is provided with locking plate, the middle body of described locking plate length direction In the embedded connecting hole being formed on described slide block, described bell housing is pushed down at the both ends of described locking plate length direction respectively The sliding surface being formed on body, and scheduled volume ground elastic deformation, so that the slide of described slide block pushes down described clutch enclosing cover.

7. Webbing take-up device according to claim 6 is it is characterised in that the one end shape in described bending of slide block direction Become to have press section, described securing rod has the connection sheet prominent to the press section side of described slide block, the leading section of described connection sheet Form ratchet corresponding with the external tooth of described ratchet, described ratchet is penetratingly formed at the hole portion on described rotor, and can with described State the external tooth engagement of ratchet.

8. Webbing take-up device according to claim 3 it is characterised in that described shim clip described ring with described from Between clutch enclosing cover.

9. Webbing take-up device according to claim 1 it is characterised in that described pad main part axially closer to The side of described rotor is provided with the seal groove of annular, and correspondingly, described armature spindle is upwardly toward the side shape of described seal groove Become the flange having annular, described flange snaps in described seal groove, airtight to form one between described gear, rotor and pad Space.

10. the Webbing take-up device according to claim 3 to 9 any one is it is characterised in that described clutch also wraps Include be coaxially disposed relative to described wireline reel and with described rotor rotate and the support that rotates, described support is arranged on described turning Between sub and described clutch enclosing cover, and push down described rotor, holding member and securing rod simultaneously.