CN102086912B - The silencer of ratchet mechanism - Google Patents

Abstract

The feature of the silencer of this ratchet mechanism is, comprise the rotation prevention portion be formed in best on ratchet, and one is provided with arranging with coaxial ratchet line and the mutual noise elimination ring that is connected of direct friction best of stop part, this stop part only can conflict to stop ratchet rotation with the form of friction self-locking with rotation prevention portion when surmounting rotation mutually; Stop part is provided with best the stop part side that the root of circumferential surface to rotation prevention portion inside contracts, this side, in order to guarantee that the reset engagement rotation of the ratchet originating in any circumferential position all can not be conflicted upper stop part, more impossiblely drives noise elimination ring to make the reset rotation of oneself be subject to any stop or delay relative to pawl wheel by it.Therefore, this silencer has not only thoroughly eradicated collision sound, and structure is simple, and the life-span is longer, works more reliable.

Description

The silencer of ratchet mechanism

Technical field

The present invention relates to the ratchet mechanism in mechanical transmission fields, particularly a kind of silencer for eliminating the collision sound between ratchet and ratchet surmounting plane in operating mode or end ratchet mechanism.

Background technique

Statement in this part only provides the background information relevant with teachings herein and analysis but not necessarily forms prior art.

Surmount in operating mode, the collision sound between the ratchet of plane or end ratchet mechanism and ratchet is affect the unfavorable factor that this mechanism uses always.And the operating life of this mechanism also shortens because of the excessive wear between consequent ratchet point and ratchet crown.In addition, this collision frequently more can cause the elastic element for bias pawl to damage because of tired, or cause the dependent magnetic element of this elastic element alternative lost efficacy because of overheated or came off, thus directly reduce the functional reliability of above-mentioned ratchet mechanism, limit its application area.

For eliminating this shortcoming, Chinese patent literature CN1070271C proposes a kind of pawl sound eliminating machine of bicycle freewheel.But this mechanism exists such deficiency, one is that its pawl sound eliminating machine must have spacer ring and overrunning clutch two-part, structure seems a little complicated; Can two be surmount in operating mode, stably conflict in the problem of the radial outside of ratchet for pawl sound eliminating machine, and the document does not have front to relate to/hand over more not provide any prompting or enlightenment.If answer be " can not ", so this patented technology will do not reach its eliminate the noise goal of the invention.And if answer is " energy ", namely spacer ring can not be extruded jointly by the pawl-and-gearing circumference of energizing, can not overcome the surface friction drag torque of overrunning clutch etc. and relatively pawl-and-gearing trackslip, so just there is such hidden danger in this patented technology.Namely, if surpassing in reverse of impelling ratchet and ratchet to recover to engage more is rotated, just in time start from the critical localisation of the radially edge in this ratchet and ratchet engagement face, or near it Surface of action occur conflict and relatively circumferential static when, can not promote by the rotation of ratchet and the relative spacer ring that trackslips of ratchet, just be provided with and stop this ratchet rotation and slide to the ability of ratchet tooth root, thus existence causes ratchet/ratchet to collapse possibility that tooth/damage or radial direction damage spacer ring by pressure.

Summary of the invention

The present invention is devoted to solve or at least alleviate the problems referred to above.

Object of the present invention, is just to provide a kind of for eliminating the collision sound surmounted in operating mode between ratchet and ratchet, and structure is simple and engage the silencer of reliable ratchet mechanism.

For reaching foregoing invention object, the silencer of the ratchet mechanism of the present invention, comprise respectively and there is ratchet, ratchet, pawl base and ratchet can be biased toward the elastic element of ratchet or the ratchet mechanism of magnetic element constantly, the rotation prevention portion of a rotation entirety is at least formed as with ratchet, and, arrange with coaxial ratchet line and the noise elimination ring be connected that at least indirectly rubs each other; Noise elimination ring is provided with and only can mutually conflicts to stop the stop part of ratchet rotation with above-mentioned rotation prevention portion when surmounting rotation, and this stop part and rotation prevention portion are radial protrusion or head face hump, and at least one of them has for competing prevent surface or standstill face; Wherein, these two protruding position relationships have and such arrange effect, namely, depart from after mutually conflicting between, ratchet should low damage ratchet in the clear, in this rotation process, rotation prevention portion can not conflict the circumferential surface of upper stop part to the rotation inner peripheral surface of this rotation prevention portion generally to the side that root inside contracts, therefore noise elimination ring can not be promoted relative ratchet by circumference and trackslip.

Preferably, also comprise be arranged on ratchet, ratchet or with their radial directions that at least circumference is fixed on one of the rotary member rotating entirety on stretch to the other side and radial height be more than or equal to zero guide protrusions.

It should be noted that, the implication of the related notion that present specification is used or noun is as follows:

Surmount to rotate and surpass in reverse and more rotate: the rotation being all the rotary member of rotary member relative torques bang path upstream one side of transmission of torque path downstream one side, just the former to relatively rotate direction consistent with the peripheral force direction that will transmit, and the latter to relatively rotate direction just in time contrary with it.

ζ angle and ξ angle: surmount/noise elimination operating mode in, ratchet rotates relative to noise elimination ring and drives between the stop part of noise elimination ring and the rotation prevention portion of ratchet by circumferential slippage friction pair therebetween and mutually conflicts and form static friction pair, wherein, as shown in Figure 3, the angle of track between the tangent line PT of this conflict position P of the common tangent/face perpendicular with the common normal line N ratchet rotation motion relative to ratchet of this conflict position such as P point is defined as conflict tilt angle λ, and can guarantee that the minimum value of the λ of the secondary self-locking of this static friction is defined as ζ, the maximum value of λ is defined as ξ, namely, ζ≤λ≤ξ.Obviously, as λ > ξ, noise elimination ring will be extruded by the common circumference of pawl-and-gearing, as λ < ζ, ratchet friction integral and relative with ratchet friction self-locking is trackslipped by noise elimination ring, and these two kinds of situations all can not form the stable conflict/stop to ratchet.

Therefore, as long as setting | ζ | < λ≤ξ, then surpass in reverse when more rotating, and the certain ratchet friction integral and relative with ratchet friction self-locking of noise elimination ring is trackslipped.Because, corresponding to the conflict tilt angle λ ' surpassed in reverse when more rotating=-| λ | < ζ, be no longer satisfied with the requirement of friction self-locking, i.e. the requirement of ζ≤λ '≤ξ.

In addition, if not dish type ratchet mechanism but end ratchet mechanism, so, above-mentioned included angle X is just provided with the implication of lead angle.

Hinge structure, the silencer mechanism of the ratchet mechanism of the present invention is simple, reliable in action, significantly improves functional reliability and the operating life of ratchet mechanism.And noise elimination ring structure is simple, easily processing, with low cost.

Accompanying drawing explanation

Fig. 1 is rough schematic view according to an embodiment of the invention, and wherein, (a) removes the left view in (b) after capping ring, and (b) was the axial section in X-F cross section in (a).

Fig. 2 is the schematic diagram of ratchet in Fig. 1, and wherein, (a) is worm's eye view, and (b) is plan view, and (c) is plan view.

Fig. 3 is with the close-up schematic view at the noise elimination loop resistance stopper position wherein of Fig. 1 (a) visual angle performance.

Embodiment

Shown in Fig. 1 ~ 3 is the silencer S of ratchet mechanism ratchet directly with guide protrusions.Usually, ratchet mechanism obtains input torque by the characteristic surface being arranged on unshowned the formation such as gear teeth, keyway or projection on the outer circumferential face of the facing flange 92 of ratchet seat rings 90, and is exported to the unshowned transmission shaft be coupled directly in any way in its endoporus by the ratchet 50 limiting rotational axis X.As shown in Fig. 1 (b), be pivotally connected to the ratchet seat rings 90 in the axial ledge at ratchet 50 two ends and capping ring 96 respectively by respective center hole, the screw fastening be combined in screw hole 94 by a group becomes the compostle member of relative ratchet 50 axial restraint.As will be known to a person skilled in the art, above-mentioned being rotatably connected preferably realizes by the such as component such as bearing or ball, but after not comprising nonessential capping ring 96, ratchet seat rings 90 also can be and the coaxial mounted rocking bar of ratchet 50 or rotating disc-shaped component, or the component of the arbitrary form fixed with unshowned frame.

The hinged pawl 70 being at least one is hinged on by bearing pin 80 in the pawl base that is arranged on ratchet seat rings 90 inner peripheral surface, and is pressed to ratchet 50 constantly by elastic element 88.Elastic element 88 is the flat springs be made up of steel wire/sheet, and is embedded in the respective radial holes/groove be arranged on ratchet seat rings 90 inner peripheral surface.See Fig. 1 ~ 2, in fact, the magnetic element that elastic element 88 also can be embedded on ratchet seat rings 90 inner peripheral surface of bearing pin 80 opposite side replaces.When the time comes, this magnetic element is used for the radial ratchet tail end extending to bearing pin 80 opposite side attracting ratchet 70.Ratchet 70 has rotary hole 82, sagittal plane to the slip surface 78 of ratchet 52, pawl point 86, and be arranged at the axial side of ratchet head best and towards the axially extended convex rotation prevention portion 72 of capping ring 96.This rotation prevention portion 72 has the standstill face 74 for conflicting coplanar with slip surface 78 best, with the circular arc inner peripheral surface 84 of rotary hole 82 coaxial line, and the edge, standstill face 76 of standstill face 74, this edge, standstill face 76 is also the radial inner edge of inner peripheral surface 84.As required, ratchet 70 also can be the non-hinged pawl without rotary hole 82 well known to those of ordinary skill in the art, such as, and rocking bar/rocking arm/swinging block.

Continue see Fig. 1, the outer circumferential face being positioned at the ratchet 50 of ratchet 70 radially inner side is provided with one group of unidirectional ratchet 52, its Surface of action 54 has the crown 56 as radially edge corresponding to turning circle H.Guide protrusions 58 is wholely set the tooth top at ratchet 52 best and is positioned at outside the radial direction of Surface of action 54.As its name suggests, the radially-outer surface of guide protrusions 58 all has the rotation leading role in radial direction in both circumferential directions to ratchet 70, each other can not friction self-locking or engagement when circumference is conflicted.Accordingly, the shape of the cross section of guide protrusions 58 can have any one or a few of such as arc, trapezoidal and triangle and so on.The radially edge of this guide protrusions 58 corresponds to turning circle Y, and the radial height between itself and turning circle H is h, h >=0.H equals zero and is namely equivalent to not arrange the situation of guide protrusions 58.

Those skilled in the art will readily understand, the main purpose of guide protrusions 58 is set, exactly in order to when surmounting rotation, causing the radial peak of the swinging track of the pawl point 86 of ratchet 70 can arrive outside turning circle H.Visible, sufficient for guide protrusions 58 number must be arranged on all ratchets 52, be no less than one, also must not be arranged on ratchet 50 or ratchet 52.Guide protrusions 58 can be arranged on a free ring completely, and this free ring becomes a rotor in the mode that at least circumference is fixing with ratchet 50 axial engagement again, and with ratchet 70 or the secondary click-fit on it, can reach equally and above-mentioned object is set.Even, guide protrusions 58 more can be set to ratchet 70 or on the surface of the footpath of secondary ratchet that is at least integrally fixed with ratchet 70 ratchet 52 facing upwards, above-mentionedly arranges object to coordinate with ratchet 52 to reach.

As shown in Figure 1,3, what be positioned at ratchet 70 radially inner side also has with the axial coordination of its rotation prevention portion 72, is set in the noise elimination ring 60 on the corresponding end-faces flange outer periphery face of ratchet 50 rotationally with direct friction succession.For making the friction torque producing between ring 60 and ratchet 50 and be implicative of each other of eliminating the noise in relative rotation, noise elimination ring 60 is the elastic opening ring of a radial shrunk type best, can null outer circumferential face direct friction be connected with the tapering of ratchet 50 to make this ring.Certainly, also by arranging the mode of the elastic element of such as wavy spring and so between noise elimination ring 60 and the axial direction of capping ring 96, noise elimination ring 60 is connected, as long as make to involve friction torque and be greater than by changing the such as means such as friction radius and friction factor the friction torque that wavy spring brings with the end face direct friction of ratchet 50.The external diameter of the annular matrix 61 of noise elimination ring 60 is little compared with the tooth root of ratchet 52 best.Be arranged at least one convex stop part 62 of this annular matrix 61 radial outside, there is prevent surface 66, prevent surface edge 65, and radial direction inside contract and circumferential surface to the stop part side 64 of inner peripheral surface 84.This side 64 can be plane or curved surface, its concrete shape and inside contract degree, with inner peripheral surface 84 along prevent surface edge 65 from going to before ratchet 70 engages with ratchet 52 is satisfactory, mutually do not conflict with inner peripheral surface 84 and be as the criterion in this side 64.Therefore, originate in the reset engagement rotation of the ratchet 70 of any circumferential position, upper stop part side 64 of all can not conflicting, more impossiblely promote noise elimination ring 60 by this side 64 and rotate relative to ratchet 50 and make the reset rotation of oneself be subject to any stop or delay.While improving the chimeric reliability that resets, naturally also eliminate ratchet 70 and collapse damage with ratchet 52, and damage the possibility of noise elimination ring 60.

In addition, this stop part 62 also has the nonessential spline projection 68 being arranged at the circumferential one end of prevent surface 66.This spline projection 68 is trackslipped for preventing the accident of the relative ratchet 70 of noise elimination ring 60 from surmounting, to reach the object of definitely noise elimination.By the prevent surface 66 of prevent surface edge 65 to spline projection 68, should have the radial height increased gradually best, this prevent surface 66 can be curved surface or plane.

Described in above, on prevent surface 66, the conflict tilt angle λ of random position is arranged to meet inequality best, | ζ | < λ≤ξ.It should be noted that, without the need to any performing creative labour, only according to the above-mentioned clear definition about conflict tilt angle λ, those skilled in the art logically can derive and draw the formula of ζ and ξ.And for any concrete specific product, as long as determine the geometric parameter of its associated components and configuration relation, the elastic parameter of elastic element 88, and the concrete friction factor etc. of noise elimination ring 60 respectively and between ratchet 50 and ratchet 70, ζ and ξ all by be unique with determine.And, can easily the friction torque between noise elimination ring 60 and ratchet 50 be controlled in inappreciable magnitude.

Above-mentioned ratchet 50, noise elimination ring 60 and ratchet 70 etc. have such effect that arranges, namely, on the one hand, when guide protrusions 58 circumference on ratchet 52 slips over the slip surface 78 of ratchet 70, can cause outside the radial upper arrival turning circle H of the pawl point 86 of ratchet 70, the radial maximum height that its edge, standstill face 76 can be caused to arrive exceedes prevent surface edge 65, but the most Gao Yuan of the radial direction that can not exceed the prevent surface 66 of stop part 62 best.So, just can guarantee can to conflict best at prevent surface 66 circumference middle part in the edge, standstill face 76 in noise elimination state, thus obtain the optimum efficiency of ratchet 70 without any degree rotation.On the other hand, on conflicting in the prevent surface edge 65 of stop part 62 edge, standstill face 76 of ratchet 70 threshold state in, the pawl of ratchet 70 point 86 radial directions are positioned at outside turning circle H best, namely radial direction exceed best the crown 56 in ratchet engagement face 54.So, just can guarantee to surpass in reverse the radial starting point of more rotating the gear motion after starting, best higher than crown 56, thus thoroughly eliminate the possibility collapsing tooth, even there is extreme case.Therefore, this just absolute guarantee surpass in reverse more in rotation process, even if occur that the circumferential initial position circumferential alignment of the gear motion/reset rotation of pawl point 86 is in the extreme case at crown 56 place in ratchet engagement face 54, there is not any possibility being subject to stop part 62 and stopping or hinder yet.When the time comes, if best higher than crown 56 in pawl point 86 radial directions, ratchet 70 is by unambiguously radial separation and be engaged to next teeth groove, and if the radial upper non-optimal ground of pawl point 86 and crown 56 are with high, so, pawl point 86/ ratchet 70 or again radial separation, successfully slide to the tooth root portion of ratchet 52, thus completely eliminate the possibility collapsing tooth, in other words, this possibility has been returned to again in original level when not installing noise elimination ring 60.

During work, see Fig. 1, torque usually reaches ratchet 50 by the ratchet seat rings 90 rotated counterclockwise through ratchet 70, then passes to by it unshowned transmission shaft be coupled directly in its endoporus.Or just in time contrary, deasil rotated by the unshowned characteristic surface forming the such as gear teeth, keyway or projection be arranged on ratchet seat rings 90 outer circumferential face and spread out of.

Surmount after rotation starts, such as, when ratchet seat rings 90 rotates counterclockwise the ratchet 50 in Fig. 1 (a) relatively, ratchet 52 on ratchet 50 and guide protrusions 58 by circumference radial jack-up ratchet 70 slidably, and by ratchet 50 rub drive noise elimination ring 60 also try hard to relative to ratchet 70 circumference rotate.Minimum be during jack-up is once rotated, when edge, standstill face 76 radial direction of ratchet 70 is upper arrive its peak when, the prevent surface 66 of the stop part 62 in relatively rotating by the mode wedged with circumference and its radial interference, such as on the P point shown in Fig. 3.So edge, standstill face 76 and prevent surface 66 set up the friction law of stable self-locking at the conflict position of such as P point.Noise elimination ring 60 then relative ratchet 70 circumference is static and start the friction of relative ratchet 50 and trackslip, but jointly can not be extruded by both.Meanwhile, ratchet 52 and ratchet 70 are stably in zero and contact and the state of relatively trackslipping of the zero absence of collision sound collided, and the lap of the radial space that both occupy separately equals zero consistently.

And surpassing in reverse more in rotation process, such as, ratchet 50 in Fig. 1 (a) relatively ratchet seat rings 90 rotates clockwise, owing to relatively rotating the change in direction, conflict tilt angle λ ' now=-| λ |, be definitely less than ζ, namely, λ ' is no longer satisfied with the requirement of above-mentioned friction self-locking inequality, the requirement of namely ζ≤λ '≤ξ.Therefore, noise elimination ring 60 now will become a rotor with ratchet 50 friction self-locking and rotate relative to ratchet 70.So, the moment of the prevent surface 66 that slips away at its edge, standstill face 76 recovers rapidly and the engaging of ratchet 52 by ratchet 70, even if this correspond to instantaneously pawl point 86 just in time circumference conflict upper ratchet engagement face 54 crown 56 and relatively circumferential static when, ratchet 70 also can as above or successfully glide along Surface of action 54 radial direction and recover to engage with the satisfactory of ratchet 52, or is directed to protruding 58 radial jack-up and slip into the engagement driving that next ratchet teeth groove sentences recovery ratchet mechanism along the ratchet back of tooth again.There is not the possibility collapsing tooth in ratchet 52 and ratchet 70, or this possibility with do not eliminate the noise ring 60 time identical.

Visible, the present embodiment only increases a noise elimination ring 60, just silencer job insecurity in prior art is fundamentally eliminated unreliable or hinder ratchet and ratchet to recover the shortcoming engaged, the possibility collapsing tooth and damage noise elimination ring 60 is also completely eliminated while ensureing to eliminate the noise, not only mechanism is simple but also reliable in action, significantly improve functional reliability and the operating life of ratchet mechanism, meanwhile, also there is structure simpler than prior art.Its noise elimination ring 60 structure is simple, easily processing, with low cost.

It is important to point out, the pawl point 86 in the present invention and crown 56 have the convenience of corner angle shape just in order to illustrate of narrow sense, and nonessential.In reality, the two can have the form of various knuckle or lead angle, no matter but its concrete why shape, ratchet 70 and ratchet 52 circumference may cause both sides to engage or the critical geometrical contact point/line of that uncertain paired appearance of radial separation to also existing all objectively during top, and this is just the true indication of pawl point 86 and crown 56 to critical geometrical contact point/line respectively.

In addition, although by suitably design, in engagement process the spinning motion of ratchet 70 should force ratchet 70 drive noise elimination ring 60 overcome surface friction drag and relatively ratchet 50 trackslip, but this will delay above-mentioned engagement process apparently and increases the contact stress between Surface of action, the reliability of engagement seriously depends on above-mentioned surface friction drag, still can not avoid the possibility collapsing tooth in the Environmental Conditions of complexity.

Apparently, with reference to above-mentioned explanation and diagram, the present embodiment also can have inside and outside modification of exchanging radial structure and position relationship, namely ratchet outside and ratchet in interior modification.And it is same easily clear, assuming that first the turning radius around the pivotal all components of axis X in Fig. 1 (a) is set as infinity, being assumed to by this figure is the plane outspread drawing that rotational axis is parallel to the tooth profile of the silencer of a ratchet mechanism of paper again, so apparently, the silencer of what Fig. 1 (a) showed the is exactly ratchet mechanism of a face type.Therefore, the silencer of end ratchet mechanism has the structure of the silencer being quite analogous to dish type ratchet mechanism, soundproof effect and functional reliability, so the present invention, without the need to making the explanation of repetition again to its structure and working procedure, illustrates with reference to above-mentioned.

Although should be noted that can conflict with prevent surface 66 forming surface contact-type in standstill face 74, but unpractical and be difficult to accomplish.One is both non-helical rotation relations, can not break-in, manufacturing tolerances just can destroy the face contact of this hope, two is geometric properties of special two centers of rotation, this face is caused to contact the ability not possessing oneself's maintenance natively, any mechanical wear all can change size and the tolerance of design, destroys the possibility that the attitude of ratchet 70 in noise elimination operating mode is consistent all the time, thus destroys this face contact that may realize easily.Therefore, above-mentioned conflict can only be the higher pair form of face and point/line formula.

Further, those of ordinary skill in the art obviously understands, the generation of above-mentioned conflict and effect there is no other ad hoc requirement to its radial upper and axially relative position, can ensure that the rotation prevention portion 72 of ratchet 70 can match with the stop part 62 of noise elimination ring 60.Such as, the form of conflicting on standstill face 74 with prevent surface edge 65 occurs, now, standstill face 74 will have the radial height gradually changed, and it also can have the projection of radial direction being stretched to ratchet 50.For another example, be disposed axially in ratchet 52 engage in plane of rotation or its two ends, left and right.So, if needed, rotation prevention portion 72 also can be arranged on ratchet 70 with the random position of the axial coordination of noise elimination ring 60 or not coordination, comprise and to be fixed into ratchet 70 circumference on secondary ratchet that the overall or rigidity of a rotation is integrated.Wherein, rotation prevention portion 72 is the closer to rotary hole 82, and stop part 62 radial height will be less, and the inclination angle that inside contracts of its stop part side 64 will be larger, and it also will be higher that accuracy of manufacturing requires.

Be not difficult to know by inference by above-mentioned explanation, above-mentioned conflict, except the distribution form that can adopt the radial direction of the present embodiment and lift, can also adopt the distribution form that the radial direction of non-optimal binds.As long as this ratchet tail end extended at the opposite side of its rotary hole 82 by ratchet 70 is as rotation prevention portion 72, then the stop part 62 of noise elimination ring 60 is arranged to head face hump shape to conflict from radial outside and this rotation prevention portion 72.

Should also be noted that noise elimination ring 60 also can rub with ratchet 50 to be indirectly connected.Such as, elastic element or the elastic material of such as cylindric wavy spring are set between the inner and outer circumferential surfaces that noise elimination ring 60 is relative with ratchet 50 both sides, or, make noise elimination ring 60 and a connection form by such as spline pair and so on rub with the circumferential fixing axle of ratchet 50 or ring and be connected.Dependency structure and working condition and more specific embodiments can consult the Chinese patent application 200810161306.X and 200820119499.8 of the guided jaw overrunning clutch by name that the applicant proposes, the full content of these two patent applications is bonded to this, and the application no longer describes in detail.

Below be only the present invention is directed to the description and diagram that its limited embodiments gives; there is particularity to a certain degree; but it should be understood that; mentioned embodiment and accompanying drawing all only for illustration of object; and be not used in restriction the present invention and protection domain thereof; its various change, equivalent, exchange and change the layout of structure or each component, all will be considered to the spirit and scope not being separated from the present invention's design.

Claims (6)

1. a silencer for ratchet mechanism, comprising:

Ratchet mechanism, it has ratchet, ratchet, pawl base, and described ratchet is biased toward elastic element or the magnetic element of described ratchet constantly; It is characterized in that, also comprise:

The rotation prevention portion of a rotation entirety is at least formed as with described ratchet, and, arrange with described coaxial ratchet line and the noise elimination ring be connected that at least indirectly rubs each other, this noise elimination ring is provided with the stop part only mutually can conflicting to stop with described rotation prevention portion the reset rotation of described ratchet when surmounting rotation, described stop part and described rotation prevention portion are one of radial protrusion and head face hump respectively, and at least one of them has for competing prevent surface or standstill face;

Wherein, the position relationship of described stop part and described rotation prevention portion has and such arranges effect, namely, depart from after mutually conflicting between, described ratchet can ratchet described in low damage in the clear, in this rotation process, described rotation prevention portion can not conflict the circumferential surface of upper described stop part to the rotation inner peripheral surface of this rotation prevention portion generally to the side that root inside contracts, therefore described noise elimination ring can not be pushed to relatively described ratchet by circumference and trackslip.

2. by silencer according to claim 1, it is characterized in that: in the conflict/surmount in operating mode of described silencer, common tangent/the face at described competing conflict position and the included angle X of track between the tangent line at this conflict position of the relatively described ratchet rotation motion of described ratchet, namely conflict tilt angle λ meets following inequality, namely, ζ≤λ≤ξ, wherein, ζ and ξ is minimum value and the maximum value at the described conflict tilt angle of the secondary self-locking of static friction can guaranteeing to be formed in described conflict position respectively.

3. by silencer according to claim 2, it is characterized in that: also comprise the guide protrusions that radial height is more than or equal to zero, described guide protrusions is arranged on described ratchet, described ratchet or with described ratchet and described ratchet at least circumference be fixed on of rotating in the rotary member of entirety, and radial direction stretches to the other side, described guide protrusions is used for surmounting in state, relative the trackslipping between described ratchet and the ratchet of described ratchet is utilized to move, cause the radial height outside the sharp turning circle corresponding to Surface of action that can arrive described ratchet of the pawl of described ratchet.

4. by silencer described in any one of claims 1 to 3, it is characterized in that: on the inside and outside side face that described noise elimination ring is positioned at described ratchet or on end face.

5., by the silencer described in any one of claims 1 to 3, it is characterized in that: described ratchet mechanism is dish type or end ratchet mechanism.

6. by the silencer described in any one of claims 1 to 3, it is characterized in that: described friction is connected and occurs between the described noise elimination ring circumferential surface relative with between described ratchet or end face, and by described noise elimination ring being arranged to the mode of open elastic ring, or arranging and the mode that described noise elimination ring is biased toward the elastic element of described ratchet can be realized.