CN205757465U - A kind of variable jaw structure protecting type helmet based on gear constraint - Google Patents

Abstract

This utility model belongs to helmet technical field, relate to the variable jaw structure protecting type helmet, its characteristic is to use the structure of gear constraint and mode to be reliably achieved chin bar conversion between full helmet position and half helmet position, and can keep uniqueness and the reversibility of its kinematic geometry track in the two-way process of chin bar everywhere.The sharpest edges of this utility model helmet are: while realizing helmet chin bar structurally variable, collet and the integrally-built integrity of chin bar can be kept, thus ensure that these core components have higher intensity and rigidity, it is effectively increased the safety in utilization of the helmet；Additionally can be greatly reduced or even be completely eliminated helmet shell surface exposes the line of rabbet joint, significantly reduces the buzz noise derived from airflow passes helmet shell surface and rainwater invades, be effectively increased the wearing comfort of the helmet；Also have collet and chin bar assembly difficulty to be reduced and use accurate gear to engage restraining structure, therefore can be effectively improved the reliability of helmet product.

Description

A kind of variable jaw structure protecting type helmet based on gear constraint

Technical field

This utility model relate to a kind of protect human body head safety the helmet, relate in particular to one be available for motor vehicles, The helmet that racing car and aircraft pilot are worn, the chin bar structure more specifically to a kind of helmet can change as required The helmet that displacement is put.

Background technology

It is known that the driver of motor vehicles, racing car and aircraft must wear the helmet to protect the safety of its head. Instantly the helmet has two kinds of patterns: the full helmet structure helmet and the half helmet structure helmet, the full helmet structural type helmet encircles driving with one The chin bar half helmet helmet of member's chin is then without this chin bar；Full helmet helmet can preferably protect user, half helmet because there being chin bar The helmet is then worn convenient due to structure opening.Typical case is complete, and helmet helmet has generally comprised helmet shell main body, guard shield and chin bar etc. Parts, wherein guard shield and chin bar are all installed in helmet shell main body, and guard shield can be raised as required or detain, and its effect is Prevent the deleterious particle such as sand and dust, rainwater and raindrop invade in the helmet with ensure under bad condition driver also can normal driving, The effect of chin bar is then that the vitals such as chin and mouth nose that can effectively protect driver when there is accident collision are not subject to To injury.The production method that the chin bar of traditional full helmet helmet is structure as a whole with helmet shell main body, that is chin bar is relative to helmet shell Main body is fixed.Certainly, this integral structure ratio of traditional full helmet helmet is stronger, thus has enough Safety；But, the full helmet helmet of integrative-structure but there are in-convenience in use and manufacture difficulty etc. defect: from use From the point of view of, it is necessary for the helmet to be taken off when the behavior that driver needs to carry out drinking water, call etc. is like this and just can complete Corresponding action, now the full helmet helmet of tradition just seems the most dull and inconvenient；And on the other hand, go out from the angle manufactured Sending out, the production mould of integral type full helmet helmet seems extremely complex because there is chin bar lower jaw structure, therefore its manufacturing cost is very High.Obviously, traditional integrative-structure full helmet helmet cannot take into account the multiobject demands such as safe and convenient and low cost.Mirror In this, Spanish patent application ES2329494T3 discloses the helmet that a kind of chin bar structure can change, additionally Chinese invention Patent ZL201010538198.0 also proposes and a kind of can realize the variable chin bar that full helmet structure and half helmet structure are mutually changed The structural type helmet, the common feature of both helmet with changeable jaw guard structures is: first chin bar uses isolating construction with helmet shell main body Secondly be thus able to reduce the helmet manufactures cost, and chin bar position from full helmet structure can be raised and crosses i.e. as required Making to be at the guard shield of open position and become half helmet helmet, the utilization that is mainly obtained of this function is arranged on collet and chin bar fork Position and the attitude of chin bar are carried out by upper line of rabbet joint shape rail groove and the constraint nail coordinated that moves with this line of rabbet joint shape rail groove work Dynamically control, in other words realize the change of chin bar structure and be completely dependent on having the rail groove of break-through speciality and it is implemented constraint. Undoubtedly, the both the above helmet uses the scheme route of variable jaw structure protecting, has preferably disposed convenient and low cost is many Target requirement, has thus promoted the progress of helmet technology.

But, although the advantage of above-mentioned two helmet with changeable jaw guard structure is self-evident, but owing to they use groove The organization plan of gap-like rail groove, thus its drawback brought highlights the most very much, is embodied in: 1) break-through speciality rail groove There is the decline inevitably resulting in helmet safety, the variable chin bar disclosed in such as Spanish patent application ES2329494T3 The structure helmet just all offers the constraint rail groove of a plurality of flat on the chin of its collet and chin bar, and Chinese patent ZL201010538198.0 also offers similar flat rail groove on its collet, it is clear that the too much slot-shaped structure of rail groove must So can destroy structural strength and the rigidity of corresponding component, reason is that on the one hand it will necessarily destroy the globality of topology layout, On the other hand it brings the concentration of stress, and certainly rail groove scheme can weaken rigidity and the intensity of these vitals, from And cause being decreased obviously of helmet safety；2) existence of break-through speciality rail groove inevitably results in the decline of the pleasant property of the helmet, many Well known, wear in the middle of the process that helmet operating motor vehicles travels driver, the most powerful relative wind will necessarily be produced and blow Stroke the helmet, owing to there is a plurality of slot-shaped rail groove, so that cannot be completely covered by and major part presents the state of externally exposure, when The air-flow brushing the helmet will produce the biggest air-flow buzz noise through the surface of these rail grooves, road speed its institute the fastest Derivative noise intensity will be the highest, it is noted that rail groove with regard to layout by the ear of driver both sides, thus will necessarily be serious Have influence on the comfortableness of driver drives vehicle；The rail groove additionally opening shape also cannot resist the invasion of rainwater, when travelling under the rainy day Not only can have a strong impact on the emotion of driver, even can the driving safety of severe jamming driver, more leisure opinion increases the pleasure driven Interest, thus experience sense is very poor, it is seen that the variable chin bar helmet currently with rail cavity feature can cause the degradation of pleasant property；3) The existence of break-through speciality rail groove inevitably results in the decline of helmet reliability, and the most slot-shaped rail groove can be serious Weaken chin bar and the rigidity of these vitals of collet and intensity, thus cause the reliability decrease of helmet product, on the other hand Slot-shaped rail groove also can increase the complexity of helmet assembling, thus causes being substantially increased of assembly difficulty, and this is due to rail groove Separation impact, not only increase the quantity of parts, and the complexity of its assembly process be also substantially increased, adjust more tired Difficulty, the constraint pair that the most slot-shaped rail groove is constituted with dynamic nail belongs to coarse kinematic pair, and its fit clearance is difficult to control to and pole Easily cause the decline of chin bar kinetic stability, it is seen that the either intensity of parts and Stiffness or quantity and assembly difficulty Rising or be rail groove and the concordance of dynamic nail fit clearance is difficult to ensure that, its final result all by reflection to helmet quality Reliability decrease.

To sum up, prior art utilizes the helmet of rail groove constraint variable jaw structure protecting, although be capable of chin bar at full helmet Carry out structure conversion between position and half helmet position, but also really deposit at aspects such as safety, comfortableness and reliabilities simultaneously There are being many hidden danger and deficiency, are the most still being necessary it is done further to improve and promote.

Summary of the invention

The problems referred to above existed for the existing variable jaw structure protecting type helmet, this utility model provides one based on gear about The variable jaw structure protecting type helmet of bundle, it is therefore intended that: improved by principle innovation and structure, be on the one hand effectively improved making of the helmet With safety, on the other hand it is effectively improved the wearing comfort of the helmet, is effectively improved the reliability of the helmet simultaneously.

The purpose of this utility model is achieved like this: a kind of variable jaw structure protecting type helmet based on gear constraint, It includes a helmet shell main body, a chin bar and two collets, and described chin bar has two and splits by helmet shell main body both sides Fork handle, said two collet is by respectively layout in the two sides of helmet shell main body, and these collets are securedly mounted to helmet shell In main body or these collets and helmet shell main body are structure as a whole making；It is characterized in that: be provided with two relative to helmet shell master The fixed gear that body is motionless, described the two fixed gear is split by the both sides of helmet shell main body, is additionally provided with two Following the rotation gear that chin bar is moved together, described the two rotates gear and is also split the both sides in helmet shell main body, is in The collet of helmet shell main body the same side, fork handle, fixed gear and rotation gear form an associated slave together；In same association In pair, rotate gear and fork being mutually fastenedly connected or they are structure as a whole makings, chin bar by fork a drive turning gear Wheel motion, when rotating gear with fixed gear generation gear motion, fixed gear rotates the position of gear by promoting and phase place is sent out Raw change, now also there is position and the change of attitude and adapt to full helmet structure and half with this in chin bar under the constraint rotating gear The conversion of helmet structure.

Above-mentioned fixed gear and rotate gear and be roller gear pattern and their engaging mechanisms of being formed belong to flat Face gear transmission mechanism, fixed gear therein be internal gear, rotation gear be external gear.

The intermeshing fixed gear of above-mentioned generation and rotation gear, the pitch radius of its fixed gear, rotate gear Pitch radius, and during engaging chin bar turn over angle relative to helmet shell main bodyTime rotate gear axis turn over accordingly Central angle, these described parameters meet constraint formulations:。

Above-mentioned layout fixed gear in same associated slave and collet is mutually fastenedly connected or they are integrated knot Body plan is made.

Above-mentioned fixed gear includes first and fixes that gear teeth section and second fixes gear teeth section, described rotation gear includes One rotates gear teeth section and second rotates gear teeth section, and the first rotation gear teeth section in same associated slave only fixes gear teeth section with first Engage, the second rotation gear teeth section is only fixed gear teeth section with second and is engaged.

The axle center of above-mentioned the first rotation gear teeth section in same associated slave and the second axis coinciding rotating gear teeth section.

First orbit of shaft center and second of above-mentioned the first rotation gear teeth section in same associated slave rotates gear teeth section Second orbit of shaft center is tangent in their point of intersection.

The above-mentioned helmet is at collet or/and offer arc groove in helmet shell main body, described arc groove participates in constraint and rotates gear Motion and make the retrained its corresponding fixed gear of rotation gear keep engagement.

The above-mentioned helmet at collet or/and be provided with in helmet shell main body elastic locking structure, described elastic locking structure cloth The two ends of office position and arc groove is echoed mutually, and wherein the two ends of arc groove correspond to full helmet position and half helmet of chin bar respectively Position.

The above-mentioned helmet is provided with guard shield, and when maximum open position, it is broken described guard shield by the cutting of helmet shell main body split institute The set in face and chin bar during movement by the track set overall situation of helmet shell main body split cutting section without occuring simultaneously.

Above-mentioned guard shield raise motion for fixed-axis rotation motion, and be provided with and bounce up the driving spring raising guard shield.

The above-mentioned helmet is provided with snap close cam, locking cam and locking spring, and described snap close cam is fastenedly connected with guard shield Or be structure as a whole making, locking cam and locking spring of snap close cam and guard shield is installed in helmet shell main body or/and collet On, locking spring normality promotes locking cam and snap close cam-engaged and can lock guard shield when guard shield is buckled and buckle dropping place at it Put.

The above-mentioned helmet is provided with release member and unlocks cam, and described unblock cam is fastened on locking cam or unlocks Cam and locking cam are structure as a whole makings, release member by chin bar fork driving or by turning gear wheel drive, release member Cam can be unlocked as desired by driving and then drive locking cam to come the locking cam to lock-out state and snap close cam Make the unlocking motion being disengaged.

The above-mentioned helmet chin bar returned back by half helmet position full helmet position full process before during three/one stroke, Described release member at least completes the most complete unlocking motion to locking cam and snap close cam.

Above-mentioned release member is that the axis of straight pin and this straight pin is arranged with the axis coaxle rotating gear, described circle Pin with rotate gear and be fastenedly connected or they are structure as a whole making.

Above-mentioned helmet correspondence guard shield is put buckleing dropping place, and described locking cam there are two kinds with snap close cam and engages locking shape State, the first lockup state is that guard shield is locked in and buckles dropping place and put and laminating occurs in the lip of lower limb and chin bar of guard shield, the Two kinds of lockup states are that guard shield is locked in and buckles dropping place and put but there are ventilative seam between the lower limb of guard shield and the lip of chin bar Gap.

The above-mentioned helmet at collet or/and be provided with in helmet shell main body and delay structure for slow down that guard shield bounces up end impact Part.

The above-mentioned helmet at collet or/and be provided with in helmet shell main body and force fork outer elastic deformation to help chin bar lip Cross the expanded configuration raising state lower shield lower rim smoothly.

A kind of variable jaw structure protecting type helmet based on gear constraint of this utility model, it is by using the knot of gear constraint Structure and mode, it is possible to reliably make chin bar carry out changing and keep its locus only between full helmet position and half helmet position One property and reversibility.On the one hand collet and the integrally-built integrity of chin bar are maintained, and take this to ensure that these helmet cores Parts have high intensity and high rigidity, thus are effectively increased the safety in utilization of the helmet；On the other hand it is greatly decreased and is Expose the line of rabbet joint to helmet shell surface be completely eliminated, take this to decrease the buzzing derived from airflow passes helmet shell surface significantly and make an uproar Sound, thus it is effectively increased the wearing comfort of the helmet；Structural intergrity additionally, due to collet and chin bar improves and assembling difficulty Degree declines, and gear engagement belongs to reliable restraining structure, therefore can be effectively improved the reliability of the helmet.

Accompanying drawing explanation

Fig. 1 is that the axle of a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model surveys view；

Fig. 2 is that a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model shown in Fig. 1 is in full helmet knot Side schematic view during structure state；

Fig. 3 is that a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model shown in Fig. 1 is in half helmet knot Side schematic view during structure state；

Fig. 4 is the blast signal of a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model shown in Fig. 1 Figure；

Fig. 5 is that a kind of variable jaw structure protecting its chin bar of the type helmet based on gear constraint of this utility model is by full helmet structure position Put the process status schematic diagram being changed to half helmet locations of structures；

Fig. 6 is that a kind of variable jaw structure protecting its chin bar of the type helmet based on gear constraint of this utility model is by half helmet structure position Put the process status schematic diagram of full helmet locations of structures of returning back；

Fig. 7 is that a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model rotates gear with fork mutually The axle being fastenedly connected surveys view；

Fig. 8 is to rotate gear shown in Fig. 7 with fork being constituted the exploded perspective view being connected assembly；

Fig. 9 is that a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model rotates gear and fixed gear It is the roller gear of two sections of gear teeth section forms intermeshing schematic diagram；

Figure 10 is to rotate gear shown in Fig. 9 to echo chin bar respectively with fixed gear and be in full helmet locations of structures state, centre Mutual mesh schematic representation when certain locations of structures state and half helmet locations of structures state；

Figure 11 is that a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model rotates gear and fixing tooth Wheel is the roller gear of one section of gear teeth section form intermeshing schematic diagram；

Figure 12 is that embodiment illustrated in fig. 11 rotates when gear engages each other motion with fixed gear concord chin bar relative to helmet The geometric parameter schematic diagram of shell bulk motion；

Figure 13 is that a kind of variable jaw structure protecting type helmet based on gear constraint of this utility model rotates gear and fixing tooth Wheel is the geometric parameter schematic diagram of two sections of gear teeth section forms intermeshing roller gear；

Figure 14 is the circular arc covered outside a kind of variable jaw structure protecting type helmet collet based on gear constraint of this utility model The schematic diagram that groove coordinates with turning gear wheel spindle nose；

Figure 15 is that this utility model is a kind of between variable jaw structure protecting the type helmet its guard shield and chin bar of based on gear constraint The axle leaving ventilative gap surveys view；

Figure 16 is the side schematic view leaving ventilative gap shown in Figure 15 between guard shield and chin bar；

Figure 17 is a kind of its guard shield releasing process shape of the variable jaw structure protecting type helmet based on gear constraint of this utility model State schematic diagram.

Detailed description of the invention

With specific embodiment, this utility model is further described below, sees Fig. 1 17:

A kind of variable jaw structure protecting type helmet based on gear constraint, it includes 1, chin bar 2 of a helmet shell main body With two collets 3, wherein collet 3 can be that a single part (not shown) can also be made up of multiple parts Parts (collet 3 that Fig. 4 shows i.e. belongs to and includes bottom 3a and the parts of enclosing cover 3b), described chin bar 2 has two and splits The other fork in helmet shell main body 1 both sides 2a, said two collet 3 by layout respectively in the two sides (seeing Fig. 4) of helmet shell main body, and And these collets 3 are securedly mounted in helmet shell main body 1 or these collets 3 and helmet shell main body 1 are structure as a whole making；At this In, helmet shell main body 1 there are a split P, this split P when driver normally wears the helmet through its mouth, nose and The left and right eyes of driver, left and right ears etc. are also divided among by its both sides by head top, the most of the present utility model in Facet P can be considered as symmetrical (as shown in Figure 1) of helmet shell main body 1, it should be noted that guard shield 6 here is by thoroughly Made by bright material, its function is for preventing rainwater and sand and dust etc. from invading in helmet shell main body 1 when driving vehicle；This practicality is new " chin bar 2 has two and splits the forks other in helmet shell main body 1 both sides 2a " described in type, be refer to the two fork 2a by Facet P is separated, and is disposed in the proximity of helmet shell main body 1 or is close to the outer surface of helmet shell main body 1, similarly " two collets 3 are securedly mounted to the two sides of helmet shell main body 1 respectively " refers to that the two collet 3 is separated also by split P It is respectively disposed at the two sides of helmet shell main body 1 and is fastenedly connected with helmet shell main body 1, wherein laying respectively at the two collet 3 When in helmet shell main body 1, corresponding driver wears the helmet with driver about the position echoed mutually of two ears be optimal layout position (as shown in Figure 4), and collet 3 and helmet shell main body 1 be fastenedly connected can use existing known various fastening structures and Method of attachment, especially includes that screw is fastenedly connected, bolt is fastenedly connected, tightening of rivet connects, being tightly bonded is solidly connected, welds fastening Connect, that snap fit is fastenedly connected, clamping is fastenedly connected etc. is various (including single and combination) fastening structure and connection side Formula, for using the helmet shell main body 1 that Plastic material makes, it can be to add thermal weld, super that welding therein is fastenedly connected Sonic soldering connects or the form of friction welding and way；Two collets 3 in this utility model can also be with helmet shell main body 1 especially Using the combination that integrative-structure makes, it includes collet 3 its bottom 3a or/and enclosing cover 3b and helmet shell main body 1 are employing one The various situation (not shown)s of body structure fabrication；Greatest feature of the present utility model is: in order to realize the structure of chin bar 2 Variable, it is respectively arranged with two fixed gears 4 motionless relative to helmet shell main body 1, described the two fixed gear 4 is split In the both sides (i.e. being separated by split P) of helmet shell main body 1, it is additionally provided with two and follows the turning gear that chin bar 2 is moved together Wheel 5(is as shown in Figure 4), described the two rotation gear 5 is also split the both sides in helmet shell main body 1 and (is i.e. divided by split P Every), be in helmet shell main body 1 the same side collet 3, fork 2a, fixed gear 4 and rotation gear 5 cooperatively form one Associated slave, that is they there are each other directly or indirectly support supporting, connect fastening, fiting constraint, motion One or more in transmission and the various incidence relations such as stress succession, it is obvious that such pass in this utility model helmet Connection secondary one has two, and the two associated slave split the both sides of facet P in the helmet and lay respectively at driver about Position that two ears echo mutually or its near (seeing Fig. 4)；In same associated slave, rotate gear 5 with fork, 2a is mutual It is fastenedly connected (as shown in Figure 7 and Figure 8) or rotates gear 5 and fork 2a is structure as a whole making (not shown), it addition, Rotate gear 5 and engage cooperation (seeing Fig. 9 to Figure 11) with fixed gear 4, when driver needs to change the structure shape of chin bar 2 When state is to obtain the full helmet structure helmet or the half helmet structure helmet, he can go pull or overturn chin bar 2 and make this with hands Chin bar 2 produces the motion (this motion synthesis has mobile and rotates two kinds of actions) relative to helmet shell main body 1, and now chin bar 2 is passed through Pitching and drive rotation gear 5 to move 2a, when rotation gear 5 and fixed gear 4 occur gear motion, this fixed gear 4 will promote Position and the phase place making this rotation gear 5 changes, and (i.e. this rotation gear 5 can be sent out relative to the position coordinates of helmet shell main body 1 Raw change, simultaneously rotation gear 5 also turn over certain angle relative to helmet shell main body 1 and rotate gear 5 in other words relative to helmet shell Main body 1 there occurs the change of phase place), now chin bar 2 will occur corresponding position and attitude under the constraint rotating gear 5 Change and with this adapt to helmet conversion between full helmet structure (seeing Fig. 2) and half helmet structure (seeing Fig. 3) (see Fig. 5 and Fig. 6)；Fig. 5 gives driver by chin bar 2 by the state procedure of full helmet locations of structures upset to half helmet locations of structures: wherein Fig. 5 A () is that to be in full helmet locations of structures → Fig. 5 (b) be that chin bar 2 initial stage of leaving full helmet locations of structures, (now guard shield 6 was by phase to chin bar 2 Spring is answered to bounce up to peak) → Fig. 5 (c) is that chin bar 2 is crossing the guard shield 6 → Fig. 5 (d) being in the highest open position for protecting It is that chin bar 2 falls laminating helmet shell main body 1 after rise and arrives half that jaw 2 has passed past the highest dome point → Fig. 5 (e) of guard shield 6 and helmet shell main body 1 Helmet locations of structures；Fig. 6 give driver by chin bar 2 from half helmet locations of structures pull and make its return back full helmet locations of structures time State procedure: wherein, Fig. 6 (a) is that to be in half helmet locations of structures → Fig. 6 (b) be that chin bar 2 leaves half helmet locations of structures to chin bar 2 Initial stage and still before whole return distances within 1/3rd processes (now guard shield 6 be unlocked and by respective springs bounce up to Peak) → Fig. 6 (c) is that to cross helmet shell main body the highest dome point → Fig. 6 (d) be that chin bar 2 has just been crossed and is in chin bar 2 The guard shield 6 → Fig. 6 (e) of the highest open position is that chin bar 2 has fallen after rise to half helmet locations of structures；Figure 10 gives rotation gear 5 position of engagement states different from fixed gear 4: wherein the engagement of Figure 10 (a) correspond to chin bar 2 and is in full helmet locations of structures such as Chin bar 2 state, the engagement of Figure 10 (c) shown in Fig. 5 (a) and Fig. 6 (e) correspond to chin bar 2 and be in half helmet locations of structures such as Fig. 5 (e) Engagement with the state of chin bar 2 shown in Fig. 6 (a), Figure 10 (b) then correspond to chin bar 2 and is in full helmet locations of structures and half helmet structure position Some centre position between putting；During above-mentioned chin bar 2 travels to and fro between full helmet locations of structures and half helmet locations of structures, The locus that chin bar 2 makees to be formed during back and forth movement can keep its uniqueness and reversibility, in other words this means to protect Under rotating gear 5 and the common constraint of fixed gear 4, it is all controlled relative to the position of helmet shell main body 1 and corner to jaw 2 With controlled and be unique and reversible, this key property and cause for design and realize the helmet half helmet structure with Conversion between full helmet structure creates condition；Full helmet structure in above-mentioned refers to that chin bar 2 is in before the helmet and will drive The organs such as the chin of the person of sailing and mouth are encircled within it and are allowed to be in shielded state (as shown in Figure 2), and half helmet structure is Refer to that chin bar 2 is in top (calvarium of correspondence driver) to the rear raised and overturn to helmet shell main body 1 (after corresponding driver Brain spoon) between position, certain (as shown in Figure 3), as long as the organ such as the mouth of driver, nose and eye is not protected when this position The configuration state that can the expose helmet the most now that blocks of jaw 2 is the half helmet structural type helmet, it is clear that chin bar 2 is in half Helmet during helmet configuration state can facilitate driver to complete the actions like this such as drinking-water, call；It must be noted that protect The position of jaw 2 is moved and attitude changes and rotates gear 5 and fixed gear 4 retrain simply by the presence of having or including above-mentioned utilization With the structure being achieved and principle, i.e. meet and belong to the variable jaw structure protecting type helmet that this utility model retrains based on gear Category；Additionally need it is noted that described in this utility model " chin bar 2 is rotating the constraint of gear 5 in this course Under the change of position and attitude also can occur, now chin bar 2 is made the locus that back and forth movement formed and can be kept uniqueness And reversibility " refer to: in rotating the motor process that gear 5 engages with fixed gear 4, owing to chin bar 2 is by turning gear Taking turns the constraint of 5 and the change of position and attitude occurs, now chin bar 2 is because having the motion relative to helmet shell main body 1 and shape The locus become has uniqueness, i.e. the motion of chin bar 2 determine that and be unique, that is the institution freedom of chin bar 2 Degree has and only only one of which, and rotates the specific position that gear 5 engages with fixed gear 4 for another one angle and determine Determine the particular location of chin bar 2 and certain particular location of attitude, in turn chin bar 2 and the angular pose in this position is the most right The unique meshing point position rotating gear 5 with fixed gear 4, this external turning gear wheel 5 is answered to engage the phase with fixed gear 4 Between, chin bar 2 is whether seted out (seeing Fig. 5) to half helmet position by full helmet position or is returned to full helmet position by half helmet position (seeing Fig. 6), when chin bar 2 is run to some specific position it in this some position relative to the position coordinate value of helmet shell main body 1 And attitude angle angle value is all well-determined, this is the described uniqueness that has, and when chin bar 2 from half helmet position to full helmet position Put the locus of chin bar 2 when returning can its position when setting out to half helmet position from full helmet position of inverting everywhere and attitude, Chin bar 2 can mutually reproduce at the locus formed in the operation of the positive and negative trend of above two and repeat in other words, that is It has reversibility；It is pointed out that in this utility model that described " chin bar 2 makees the locus that back and forth movement is formed Uniqueness and reversibility can be kept " allow due to the various factors such as foozle, fit-up gap, stress deformation caused a little Permitted inaccuracy or small accurate, that is chin bar 2 is made the locus that back and forth movement formed and allowed it certain model occur Enclosing interior does not affects the deviation that the helmet normally uses, and repeatability and the uniqueness of chin bar 2 locus allows it to deposit in other words Having certain error, but premise is these errors can not have influence on chin bar 2 between full helmet position and half helmet position turn Change.Split P in this utility model there are with the outer surface of the components such as helmet shell main body 1, chin bar 2 and guard shield 6 and to intersect Section line S(sees Fig. 1 and Fig. 4), this section line S is made up of three parts, and they are split P and the cutting of helmet shell main body 1 respectively Intersection S1, split P and the section line S2 of guard shield 6, split P and the section line S3 of chin bar 2, therefore section line S can also mark Know for S(S1, S2, S3)；Fixed gear 4 in this utility model is static the most motionless relative to helmet shell main body 1, It has a various structures distribution form: 1) fixed gear 4 for individual member and is the most directly securedly mounted in helmet shell main body 1 (not shown)；2) fixed gear 4 and helmet shell main body 1 are structure as a whole making (not shown)；3) fixed gear 4 is only Vertical component is also fastened on (not shown) on helmet shell main body 1 and collet 3 simultaneously；4) fixed gear 4 be separate piece and with the end Torr 3 employing is fastenedly connected and is fixedly installed to (not shown) in helmet shell main body 1 the most together；5) fixed gear 4 and collet 3 Use integrative-structure to make and be fixedly installed to (fixed gear 4 just that Fig. 4, Fig. 9 and Figure 10 provide in helmet shell main body 1 the most again Bottom 3a with collet 3 uses the situation of integrative-structure making)；In the middle of above-mentioned five kinds of topology layout situations of fixed gear 4, With its latter two situation for preferred construction layout, now fixed gear 4 and collet 3 are for being fastenedly connected or the system of being structure as a whole Make, thus produce the helmet time can in advance to the collet 3 in same associated slave, pitch 2a, fixed gear 4 and turning gear Wheel 5 carries out pre-assembled, they is securely mounted in helmet shell main body 1 the most again, so can reduce the difficulty of assembling thus protect Demonstrate,prove installation quality and the efficiency of assembling can be improved；It addition, fixed gear 4, rotation gear 5 and the optimal phase para-position of collet 3 Putting layout is: fixed gear 4 with rotate gear 5 engage each other and together with layout between the bottom 3a and enclosing cover 3b of collet 3, also Fixed gear 4 and rotation gear 5 are added be clipped in the middle (seeing Fig. 4) by i.e. bottom 3a and enclosing cover 3b.Additionally need it is noted that this Fixed gear 4 and rotation gear 5 in utility model can have various structures pattern, are such as spur gear structure, helical teeth rolling hitch Structure or other gear structures etc., wherein with fixed gear 4 with to rotate gear 5 be roller gear (now their indexing Circle and pitch circle are circle or for circular arc) it is optimum structure form (as shown in Fig. 4, Fig. 9 to Figure 13), certainly, in order to obtain Obtain some special profile constraints target and effects, fixed gear 4 and rotation gear 5 and even can also is that other various non-cylindrical (now they intermeshing pitch circles can be oval, polygon or other abnormity, figure to the special shape gear structure of type gear Not shown in), but no matter use the gear of what form, complete their selection all should realize helmet knot to contribute to constraint chin bar 2 Structure and half helmet structure be converted to criterion, and from making easily and easy-to-install angle, fixed gear 4 and turning gear Optimal construction type and the assembling form of wheel 5 be: fixed gear 4 and rotate gear 5 and be roller gear pattern, and they institutes The engaging mechanism of composition belongs to face gear drive mechanism (axis of i.e. involved gear is arranged in parallel), wherein fixes tooth Wheel 4 for internal gear structure and rotate gear 5 for external gear construct (as shown in Fig. 4, Fig. 9 to Figure 13), now rotation gear 5 along The track (so-called rotation gear axis track L) rotating gear axis O5 when fixed gear 4 makees engagement rotation will appear as The fixed gear axle center O4 of the center of circle of one section of circular arc line and this circular arc line and engaged fixed gear 4 overlap (see Figure 11 and Figure 12)；It is emphasized that: " fixed gear 4 and rotate gear 5 the most simultaneously for cylindrical gear type described in this utility model Formula, and the engaging mechanism that they are formed belongs to face gear drive mechanism " it is the saying of a kind of containing, i.e. relate to The axis of fixed gear 4 and rotation gear 5 allows to exist a certain degree of not parallel (including resting state and running status), also The fixed gear 4 i.e. caused due to reasons such as various foozles, rigging error, stress deformation and temperature rise deformation and turning gear The axis unparalleled phenomenon that wheel 5 is occurred in some some positions or regional area is to be allowed for, and additionally includes considering The fixed gear 4 occurred in the regional area produced to factors such as various moulding needs, obstacle detouring needs, lock-bit need and rotation Not parallel being also allowed of gear 5 axis, wherein " moulding needs " refer to that chin bar 2 is because obedience helmet overall appearance moulding The cause that occurs, " obstacle detouring needs " refer to that chin bar 2 is crossing some limiting point position such as peak, of guard shield 6 and helmet shell main body 1 Rear point and the widest etc. and the cause that occurs, " lock-bit needs " refer to chin bar 2 full helmet locations of structures and half helmet locations of structures with And since it is desired that cross over some capture feature and produce the cause that elastic adaptive deformation is occurred time near these extreme positions, Every that cause for above-mentioned reasons and in the range of allowable error, (the most do not affect gear and normally engage operation) fixing tooth Wheel 4 with rotate the axis unparalleled phenomenon that occurred of gear 5 be all regarded as belonging in this utility model " fixed gear 4 and Rotate the engaging mechanism that formed of gear 5 and belong to face gear drive mechanism " category.In order to retrain chin bar 2 accurately Behavior and track, fixed gear in this utility model 4 and rotate the parameter of gear 5 so a kind of design can be used former Then, it may be assumed that intermeshing fixed gear 4 is occurred for those and rotates gear 5, the pitch radius of its fixed gear 4, turn The pitch radius of moving gear 5, and they engage during chin bar 2 turn over angle relative to helmet shell main body 1Time turning gear The central angle that wheel axle center O5 turns over accordingly(seeing Figure 11 and Figure 12), these parameters described meet constraint formulations: ；It is clear that intermeshing fixed gear 4 is with rotating gear 5, they should have identical modulus, and when fixed gear 4 When being all master gear with rotation gear 5, the pitch radius of the most described fixed gear 4It is dividing of this fixed gear 4 Degree radius of circle, the pitch radius of rotation gear 5It is the reference radius of this rotation gear 5.It is pointed out that this practicality Fixed gear 4 in novel both can be that the gear (as is illustrated by figs. 11 and 12) of the most unique one section of gear teeth section can also be for bag Containing the gear of some sections of gear teeth sections, similarly rotating gear 5 both can be that the gear of only one section of gear teeth section is (such as Figure 11 and Tu Shown in 12) can also be the gear including some sections of gear teeth sections, and for including the fixed gear 4 of some sections of gear teeth sections Saying, between their different gear teeth sections, design parameter (such as modulus, the number of teeth, reference circle, pitch circle, gear teeth segment length etc.) is the most permissible Identical can also differ (the most as the same for including the rotation gear 5 of some sections of gear teeth sections), be arranged being advantageous in that Can need to design preferably chin bar 2 track according to the profile of helmet shell main body 1 and also can increase the motility of design and layout；This The movement locus rotating gear axis O5 when making engagement rotation along fixed gear 4 is referred to as rotated gear axis by utility model Track L(sees Figure 11 and Figure 12), it is clear that for belonging to face gear drive mechanism and the fixed gear 4 for cylindrical gear type For rotating the engaging of gear 5, the rotation gear 5 engaged when fixed gear 4 only one section of gear teeth section the most only only has One section of gear teeth section (as is illustrated by figs. 11 and 12), now rotate gear axis track L would is that one section of arc-shaped full curve, And the arc core of this rotation gear axis track L is exactly fixed gear axle center O4 and above-mentioned rotation gear axis O5 The central angle turned overThis parameter also carries out measuring (seeing Figure 11 and Tu using fixed gear axle center O4 as reference coordinates 12), some sections of gear teeth section fixed gears 4 are included for those and rotates the engaging of gear 5, now rotate gear axis rail Mark L will be made up of some sections of arc-shaped curves；Especially, all it is all when fixed gear 4 and rotation gear 5 there are two sections of gear teeth The when of section (as shown in Fig. 4, Fig. 9, Figure 10 and Figure 13), can accomplish to take into account and meet chin bar 2 to simple and reliable for structure and to multiple The dual requirements of miscellaneous trajectory planning, Fig. 4, Fig. 7 to Figure 10, Figure 13 give to include two gear teeth sections and belong to face gear and pass The cylindrical gear type of motivation structure rotates the situation of gear 5, and Fig. 4, Fig. 9, Figure 10 and Figure 13 give and include two gear teeth Section also belongs to the situation of cylindrical gear type fixed gear 4 of face gear drive mechanism: wherein, fixed gear 4 includes first Fixing gear teeth section 4a and second fixes gear teeth section 4b, rotation gear 5 includes the first rotation gear teeth section 5a and second and rotates the gear teeth Section 5b, and the first rotation gear teeth section 5a in same associated slave only fix with first gear teeth section 4a engage and the Two rotation gear teeth sections 5b are only fixed gear teeth section 4b with second and are engaged, and here first fix gear teeth section 4a and the first rotation wheel The modulus of tooth section 5a and second fixes gear teeth section 4b and the second modulus rotating gear teeth section 5b both can identical (now their tooth Shape is identical, can also differ as shown in Figure 9 and Figure 10) (now their profile of tooth differs, not shown in figure), first fix The number of teeth of gear teeth section 4a fix with second the number of teeth of gear teeth section 4b both can equal can also unequal, first rotate gear teeth section 5a The number of teeth with second rotate gear teeth section 5b the number of teeth both can equal can also be unequal, fixed gear 4 will have two in addition Gear axis i.e. corresponding first is fixed the first fixed gear axle center O4a and corresponding second of gear teeth section 4a and fixes the of gear teeth section 4b Two fixed gear axle center O4b(are as shown in Fig. 9 and Figure 13), rotate gear 5 and also will have two gear axis i.e. correspondence first turn The first rotation gear axis O5a and corresponding second of driving wheel tooth section 5a rotates the second rotation gear axis O5b(of gear teeth section 5b such as Shown in Fig. 9, Figure 10 and Figure 13).It is pointed out that for being respectively provided with multiple gear teeth section and belonging to face gear drive mechanism Cylindrical gear type fixed gear 4 and rotation gear 5, there are intermeshing fixing gear teeth sections and rotate its pitch circle of gear teeth section in them Radius and in they chin bar 2 turns over relative to helmet shell main body 1 during engaging angles with rotate what gear axis O5 turned over Central angle still follows the restriction on the parameters formula above provided, to be respectively provided with two gear teeth sections and to belong to face gear drive mechanism Cylindrical gear type fixed gear 4 with rotate gear 5 as a example by, it is assumed that they are made intermeshing first and fix gear teeth section 4a and the One pitch radius rotating gear teeth section 5a is respectivelyWith(seeing Figure 13) and they engage during chin bar 2 relative to Helmet shell main body 1 turns over angleTime correspondingly first rotate gear axis O5a turn over central angle(parameterWithThe most not Indicate, but their geometric definition and meaning be referred to and use for reference Figure 12), then before these parameters need nonetheless remain for following The restriction on the parameters formula that is the needs that are given meet:, similarly, it is assumed that they intermeshing second fast pulleys Tooth section 4b and second rotates the pitch radius of gear teeth section 5b and is respectivelyWith(seeing Figure 13) and they engage during protect Jaw 2 turns over angle relative to helmet shell main body 1Time correspondingly second rotate gear axis O5b turn over central angle(parameterWithThe most also do not have sign, but their geometric definition and meaning be referred to Figure 12 too), then these parameters are still same Sample needs to meet the restriction on the parameters formula above provided that is needs meet:.Two wheels are respectively provided with for those Tooth section and belong to face gear drive mechanism cylindrical gear type fixed gear 4 with rotate gear 5 for, rotate gear 5 Orbit of shaft center will be made up of two sections of trajectories, they be respectively the first rotation gear teeth section 5a first rotation gear axis The second of the first orbit of shaft center L1 and second rotation gear teeth section 5b that O5a is formed rotates second that gear axis O5b is formed Orbit of shaft center L2(sees Fig. 9 and Figure 13), in order to ensure that chin bar 2 is not jumped its position during two sections of different gear teeth sections handing-over The sudden change of the formula that jumps, to make chin bar 2 can tide over cross-connecting area smoothly, can allow the first of the first rotation gear teeth section 5a rotate gear Axle center O5a and second rotates the second rotation gear axis O5b of gear teeth section 5b and coincides together (such as Fig. 9, Figure 10 and Figure 13 institute Show), the i.e. first rotation gear teeth section 5a and second rotates gear teeth section 5b and has same gear axis (O5a, O5b)；It addition, in order to Ensure that chin bar 2 its motion is devolved on during two sections of different gear teeth sections handing-over has good ride comfort, the first rotation can be allowed to take turns First orbit of shaft center L1 of tooth section 5a and second rotates the second orbit of shaft center L2 of gear teeth section 5b and there is intersection point Q, and makes first Orbit of shaft center L1 and the second orbit of shaft center L2 tangent at intersection point Q (as shown in Fig. 9 and Figure 13), in other words at intersection point Q first Orbit of shaft center L1 and the second orbit of shaft center L2 has and the most unique common tangent；It will be apparent that for having same gear First rotation gear teeth section 5a in axle center (O5a, O5b) and second rotates gear teeth section 5b, the first axle of its first rotation gear teeth section 5a Heart track L1 and second rotates the second orbit of shaft center L2 of gear teeth section 5b and has naturally occurred intersection point Q, if first rotating wheel especially Tooth section 5a and second rotates gear teeth section 5b to be had the most again the number of then intersection point Q if equal reference radius and is up to nothing The most multiple, the gear 5 that rotates at this moment will deteriorate to the gear of only one section of gear teeth section；It is worthy of note, consolidating of two sections of gear teeth Fixed gear 4 and rotation gear 5, the gear teeth section part of each of which can use discontinuous layout, the i.e. first fast pulley It can be that staggered arrangement that is first fixes gear teeth section 4a and second and fixes gear teeth section 4b that tooth section 4a and second fixes gear teeth section 4b Directly docking links together (seeing Fig. 4, Fig. 9, Figure 10 and Figure 13), correspondingly first rotates gear teeth section 5a and second turn Driving wheel tooth section 5b can also be that staggered arrangement that is first rotates gear teeth section 5a and the second rotation gear teeth section 5b directly in succession Be connected together (seeing Fig. 4, Fig. 7 to Figure 10, Figure 13), certainly, have two sections of gear teeth fixed gear 4 and rotate gear 5 they Respective gear teeth section can also use continuous print layout that is first to fix gear teeth section 4a and second, and to fix gear teeth section 4b permissible Dock the (not shown) that links together, the first rotation gear teeth section 5a and the second rotation gear teeth section 5b also to dock and be connected to one Play (not shown).In order to preferably make rotation gear 5 keep good engagement with corresponding fixed gear 4, permissible At collet 3 or/and offer arc groove 7(as shown in Fig. 4, Fig. 9, Figure 10, Figure 11 and Figure 13 in helmet shell main body 1), now arc groove 7 Can utilize its two rail limit 7a retrain rotate gear 5 spindle nose 5c, and accordingly so participate in retrain this rotation gear 5 fortune Dynamic, so that the fixed gear 4 that rotation gear 5 echoes with it keeps engagement to contact, the optimum structure form of spindle nose 5c is cylinder Face (sees Fig. 4, Fig. 7 and Fig. 8), because the cunning that the face of cylinder can better adapt between spindle nose 5c and arc groove 7 is joined, Figure 14 is given The situation that arc groove 7 on enclosing cover 3b coordinates with spindle nose 5c；When arc groove 7 is opened on collet 3, arc groove 7 is the most permissible Only individually it is opened on enclosing cover 3b, can also all offer on enclosing cover 3b and bottom 3a simultaneously；It should be noted that arc groove 7 Can be the logical groove-like structure (as shown in Figure 4) of break-through can also be the heavy groove-like structure (not shown) of not break-through, and Logical groove-like structure can and be deposited with heavy groove-like structure, such as can offer on enclosing cover 3b logical groove-like structure arc groove 7 and with This offers not shown in the arc groove 7(figure of heavy groove-like structure on bottom 3a simultaneously), optimised form be collet 3 enclosing cover 3b and All offer the arc groove 7(of logical groove-like structure on bottom 3a as shown in Figure 4), simultaneously at the both sides axle head of same rotation gear 5 All offer the kinetic stability that spindle nose 5c matches the most therewith, so can preferably retrain and keep to rotate gear 5；Need Bright, that enclosing cover 3b the offers the most logical groove-like structure (as shown in Fig. 4 and Figure 14) of arc groove 7, in order to pitch 2a and turn Moving gear 5 occurs the structure of contact more to simplify, and now its best layout of the arc groove 7 on enclosing cover 3b is to allow chin bar 2 no matter It is in full helmet position or can effectively to shelter from this arc groove 7 in half helmet position and make it occur without as far as possible and expose (i.e. Arc groove 7 is can't see the most completely by seeing less when the external observation helmet), such topology layout can efficiently reduce air-flow When flowing through helmet shell main body 1 because gap is exposed derivative buzz noise；It is further to note that the optimal knot of arc groove 7 Configuration formula is: arc groove 7 with rotate gear 5 axes movement locus line for wherein separated time, the in other words middle separated time of arc groove 7 It is rotation gear axis track L(and sees Figure 11), now arc groove 7 retrains two rail limit 7a of spindle nose 5c back and forth movement For rotating the equidistant limit of gear axis track L and splitting on the both sides of this rotation gear axis track L other (as shown in figure 11), when So, if fixed gear 4 and rotate gear 5 and be the gear including two gear teeth sections, then first the of gear teeth section 5a is rotated One orbit of shaft center L1 and second rotates the bisector that the second orbit of shaft center L2 of gear teeth section 5b is all 7 two rail limit 7a of arc groove, That is these two rail limit 7a are equidistantly split side, the both sides (seeing Figure 13) at them；Also, it should be noted arc groove 7 was both Can individually be opened in (not shown) on bottom 3a, can also individually be opened in (not shown) on enclosing cover 3b, also may be used To be opened on bottom 3a and enclosing cover 3b (as shown in Figure 4) simultaneously.When chin bar 2 is in full helmet locations of structures or is in half helmet knot During the two extreme position of structure position, in order to effectively reduce or even gap spindle nose 5c and arc groove 7 between be completely eliminated During to ensure locking chin bar 2, there is good stability and fixing, elastic locking structure 8(such as figure can be set on collet 3 Shown in 4), also can arrange in helmet shell main body 1 elastic locking structure 8(figure not shown in), this elastic locking structure 8 layout position Putting the two ends with arc groove 7 to echo mutually, wherein the two ends of arc groove 7 correspond to full helmet position and half helmet of chin bar 2 respectively Position, elastic locking structure 8 is made up of (seeing Fig. 4 and Figure 13) elastic strip 8a and preset slot 8b, and wherein elastic strip 8a is slightly Within charging into arc groove 7 and make at this groove width slightly less than rotating the diameter of spindle nose 5c of gear 5, the function of preset slot 8b be to Elastic strip 8a reserves certain elastic deformation and makes a concession space, and the spindle nose 5c rotating gear 5 must extrude elastic strip 8a and be allowed to There is could to pass through after elastic deformation the arc groove 7 at this and eventually enter into the end of arc groove 7 and (now correspond to chin bar 2 Just it is in full helmet position or is in half helmet position), the spindle nose 5c once rotating gear 5 enters into the end head of arc groove 7 In position, elastic strip 8a can utilize the elastic return characteristic of itself again to charge in arc groove 7 and jam spindle nose 5c at once And be allowed to can not rollback easily, thus limit rotation gear 5 and make it that play can not occur easily, its final result is to strengthen Locking chin bar 2 is in full helmet position and the stability of half helmet position the two extreme position.To sum up, this utility model uses gear Mechanism goes to retrain movement locus and the behavior of chin bar 2, it is possible to reliably make chin bar 2 in full helmet locations of structures and half helmet locations of structures Between carry out changing and can keeping uniqueness and the reversibility of its locus；Meanwhile, due to more without arranging The slot structure of break-through shape, therefore collet 3 and the integrally-built integrity of chin bar 2 are maintained, thus ensure that these helmets Core component has high intensity and high rigidity, thus can be effectively improved the safety in utilization of the helmet；It addition, above-mentioned constraint The use of mechanism can also reduce so that helmet surface can be completely eliminated expose the line of rabbet joint, thereby reduce airflow passes helmet shell The buzz noise that main body 1 surface is derived from, and reduce the probability that rainwater invades, such that it is able to the wearing of the helmet is greatly improved Comfortableness；Additionally, be also improved because of the structural intergrity of collet 3 and chin bar 2 and its assembly difficulty has declined, and gear is nibbled Close and belong to again accurate and reliable restraining structure, therefore can be effectively improved the reliability of the helmet.

This utility model is in order to such as occur that under complex environment operating mode also being able to guarantee during sand and dust rainwater weather drives The person of sailing normally drives, and can arrange a guard shield 6(as shown in Figures 1 to 6 on the helmet), mounting strap 6 can be effective Block sand and dust and rainwater, it can in addition contain avoid head-on wind to brush eyes, therefore can be effectively improved the safety of driving with comfortable Property；It should be noted that guard shield 6 can be shifted one's position relative to helmet shell main body 1, it can be raised as required or detain Fall, when its be in button fall state time can play above-mentioned protective effect, then can implement when it is in open position to drink water, The actions such as call；Its main body of guard shield 6 in this utility model is the eyeglass using transparent material to make, additionally in this utility model Guard shield 6 also include two supporting leg 6a, therefore guard shield 6 described in this utility model refers both to these parts for including eyeglass and two The molectron of bar supporting leg 6a, guard shield 6 is arranged in helmet shell main body 1 (as shown in Figure 4) by its two supporting leg 6a or is arranged on (not shown) on collet 3, guard shield 6 can make swing or the rotation of certain angle relative to helmet shell main body 1, and guard shield 6 is Good version is that its eyeglass uses dismountable interface arrangment card to fit on supporting leg 6a, so can install mirror more quickly Sheet and eyeglass can be changed when being necessary；As it was previously stated, the chin bar 2 of this utility model helmet is varistructure type chin bar 2, that is its location layout can change, as required in order to protect between full helmet locations of structures and half helmet locations of structures Card chin bar 2 can and can be returned back from half helmet locations of structures to half helmet locations of structures from the upset of full helmet locations of structures smoothly Full helmet locations of structures, chin bar 2 of the present utility model allows for crossing over the guard shield 6 when being in maximum open position, for this this reality Specially make guard shield 6 by design planning with novel it is broken by the cutting of helmet shell main body 1 split P institute when maximum open position The set in face and chin bar 2 during whole motion by the track set overall situation of helmet shell main body 1 split P institute cutting section without handing over Collection, Figure 12 provide this trajectory T of trajectory T(of the procheilon M of chin bar 2 can be considered be distributed on split P), in fact procheilon M just falls and (sees Fig. 4) on section line S3, and this procheilon M is cutd open by split P in the middle of the running of chin bar 2 all the time Switch to, it is noted that trajectory T is chin bar 2 and (is most pressed close to helmet by the interior envelope of the track set of split P institute cutting section The track envelope of the chin bar 2 of shell main body 1), as long as it is broken by the cutting of split P institute so guard shield 6 is when maximum open position Within face fully falls in trajectory T and they occur without intersect can complete this utility model guard shield 6 maximum open position with The layout that chin bar 2 does not interferes, this utility model carries out the trajectory planning of chin bar 2 and with this reality according to this principle just Execute the layout of the maximum open position of guard shield 6.

Guard shield 6 of the present utility model is supported by its two supporting leg 6a and is arranged in helmet shell main body 1 or is arranged on collet 3 On, implement raising and buckleing of guard shield 6 in order to convenient, guard shield 6 can make two-dimensional rotary (i.e. in certain amplitude range Simple rotary type raise motion, as shown in figs. 4 and 17) or make the motion (figure of two-dimensional rotary and compound two-dimensional movement Not shown in), additionally can make Three dimensional rotation and three-dimensional moves (not shown), from the angle of simple in construction, with The situation arranging supporting leg 6a to be equivalent to two dimensional surface motion is preferable；Especially, this utility model can raising guard shield 6 Motion design is fixed-axis rotation motion, that is guard shield center of rotation O6 of guard shield 6 at least supporting leg 6a one dead axle of existence, And allow guard shield 6 can carry out the rotation (as shown in figs. 4 and 17) of certain corner around this guard shield center of rotation O6, here Guard shield center of rotation O6 is motionless relative to helmet shell main body 1, and the action of raising and buckle of guard shield 6 is arranged to fixed-axis rotation Benefit is: first can simplify supporting structure and the layout of guard shield 6, secondly can simplify the motion arrangement of guard shield 6 and be conducive to Simplify the trajectory planning of chin bar 2；It is pointed out that when guard shield 6 raise motion be designed to fixed-axis rotation time, in order to obtain Reliably rotating support in order to avoid there is movement interference, two supporting leg 6a of guard shield 6 all should each arrange during guard shield rotates Heart O6(is as shown in Figure 4), and it is preferred that line and the helmet shell main body 1 of the two guard shield center of rotation O6 of these supporting legs 6a Split P is mutually perpendicular to；It addition, in order to fast raise guard shield 6, can arrange and bounce up the driving spring 9 raising guard shield 6 (seeing Fig. 4 and Figure 17), accordingly even when call for help when such as occurring contingency in the case of emergency opens guard shield 6 Needs need, rapidly adapted to through dark tunnel vision etc., now driver only need to make and touches or gently dial guard shield 6 Action i.e. can open guard shield 6 quickly by the bouncing up power of driving spring 9；Described driving spring 9 can be torsion bullet Spring (as shown in figs. 4 and 17), can also be common cylindrical spring (not shown), can also is that other form in addition Spring such as produces the leaf spring of elastic force, shell spring, pole spring etc. (not shown) by deformation, the most again with driving spring 9 employing torque spring structures are preferred versions, because the spring of this form is taken up space less, beneficially the compact of the helmet sets Meter；Additionally need it is noted that driving spring 9 to the force mechanism of guard shield 6 can be pulling force form can also be pressure pattern Even thrust form, can also is that torsion form in addition, and for using the driving spring 9 of torque spring structure, yes It is applied to the force mechanism on guard shield 6 as optimised form with the form producing torsion.

This utility model is buckled state in order to echo that guard shield 6 usually needs to present and can lock it in and buckle shape State position, can arrange corresponding snap close cam 10, locking cam 11 and locking spring 12(on the helmet and see Fig. 4 and Tu 17), wherein snap close cam 10 and guard shield 6 are mutually fastenedly connected (not shown) or snap close cam 10 with guard shield 6 is simply Integrative-structure makes (in Fig. 4 and Figure 17, the supporting leg 6a of snap close cam 10 and guard shield 6 be structure as a whole making), described locking Cam 11 and locking spring 12 are installed in helmet shell main body 1 or/and (Fig. 4 and Figure 17 show locking cam 11 and lock on collet 3 Only spring 12 is all installed in the situation in helmet shell main body 1), locking cam 11 can produce certain relative to helmet shell main body 1 Displacement is moved or/and rotate swing, and the function of locking spring 12 is that normality promotes locking cam 11 to nibble with snap close cam 10 Closing, and can lock guard shield 6 when guard shield 6 is buckled and buckle dropping place at it and put, locking spring 12 can be that torque spring is (such as Fig. 4 Shown in Figure 17), can also be that cylindrical spring (not shown), the spring that can also is that other form in addition are as by deformation And produce the leaf spring of elastic force, shell spring, pole spring etc. (not shown), use torque spring to tie with locking spring 12 the most again Structure is preferred versions；It should be noted that guard shield 6 is in and buckles state and be in other words and buckle dropping place and put and refer to that this guard shield 6 is relative It is in so one class position: guard shield 6 is positioned at driver's eyes and the front of nose and is in driving of can screening in helmet shell main body 1 On the position of member's eyes, especially, when chin bar 2 is also located at full helmet locations of structures this moment, the dropping place of buckleing of described guard shield 6 is put the most extremely Include two states less: a kind of state is that the lower limb 6b of guard shield 6 is fitted in lip 2b of chin bar 2, and now guard shield 6 has Best rainproof, Radix Saposhnikoviae and dustproof effect；Another kind of state is that the lower limb 6b of guard shield 6 there are one with lip 2b of chin bar 2 Fixed ventilative gap 6c(is as shown in Figure 15 and Figure 16), this ventilative gap 6c now can be utilized to introduce extraneous slight air and to dispel Produce due to breathing on guard shield 6 inwall and the steam in helmet shell main body 1 and water smoke, it can be seen that, described in this utility model Guard shield 6 be in that to buckle dropping place and put be a class state；The function of locking cam 11 is by protecting with engaging of snap close cam 10 Cover 6 maintains or is locked in some button dropping place and puts, the most when necessary can also be by other mechanism or by it Its parts unties locking cam 11 makes guard shield 6 to raise with engaging of snap close cam 10.

The conversion of this utility model helmet lock-out state Yu released state in order to solve guard shield 6, also can be as required Determine locking cam 11 engage with snap close cam 10 and locking or do not occur engage and unlock, unblock structure can be set Part 13 and unlock cam 14, wherein unlock cam 14 for separate piece and be fastened on locking cam 11 (not shown) or Unlock cam 14 and locking cam 11 to be structure as a whole makings (as shown in figs. 4 and 17), this mean that unblock cam 14 and The motion of locking cam 11 is the linkage in other words conj.or perhaps carried out together；Make above-mentioned to echo the location status of chin bar 2 Locking action or make unlocking motion, described release member 13 uses to be pitched by chin bar 2 and 2a is driven or uses by turning gear The mode of wheel 5 driving is run, it is noted that the fork of chin bar 2 links 2a together with rotating gear 5, that is means to unlock structure Part 13 can drive unblock cam 14 according to the motion process of chin bar 2 and and then drive locking cam 11, such that it is able to must When wanting, the locking cam 11 to lock-out state makes, with snap close cam 10, the unlocking motion being disengaged；It should be noted that work as Release member 13 is pitched by chin bar 2 when 2a being driven or is driven by rotation gear 5, can produce substantial unlocking motion I.e. unlock those locking cams 11 being in generation engagement and see Figure 17 with snap close cam 10() but it also may have other one Kind of situation is i.e.: guard shield 6 means that snap close cam 10 is true with locking cam 11 already in bouncing up the state of raising this moment in other words On be in the state being disengaged already, but release member 13 still can drive unblock cam 14 to make unlocking motion, aobvious Unlocking motion the most now belongs to empty action or perhaps redundant actions, and it will not hinder affects the properly functioning of chin bar 2；Especially It is pointed out that this utility model is put being in button dropping place and is in the guard shield 6 of lock-out state, its unlocking motion can also be by Chin bar 2 has directly driven, and now chin bar 2 must be in full helmet locations of structures and guard shield 6 is in and buckles dropping place and put (Fig. 4 and Tu State shown in 17 echoes this situation just), the hands by driver goes pull chin bar 2 and make it from full helmet position to half helmet position Putting and set out, chin bar 2 drives guard shield 6 to raise motion into contact with the lower limb 6b of guard shield 6 by force, and at guard shield 6 When making motion, the snap close cam 10 by linking with it oppresses locking cam 11, and then oppresses locking bullet by locking cam 11 Spring 12 also promotes locking spring 12 to make shrinking back and step down, and finally achieves locking cam 11 and is forced to be disengaged with snap close cam 10 And complete to unlock, in the middle of this process, the guard shield 6 after unblock can be raised rapidly by the bouncing up power of driving spring 9, And guard shield 6 just completes to bounce up before the top that arrive helmet shell main body 1 prior to chin bar 2 to be raised to maximum open position, at Fig. 5 In by the most this situation of process shown by Fig. 5 (a) → Fig. 5 (b).

This utility model is in order to prevent and avoid chin bar 2 possibility when being returned to full helmet locations of structures by half helmet locations of structures Colliding with guard shield 6 and interfere, this utility model special arrangements are returned back entirely the entering of full helmet position by half helmet position in chin bar 2 In the front three/one stroke of journey, release member 13 is allowed at least locking cam 11 and snap close cam 10 to be completed the most complete solution Lock action, the purpose being arranged is to avoid the occurrence of such a situation: chin bar 2 is returned back full helmet structure by half helmet locations of structures Position and during this guard shield 6 the most still stop and be maintained at and buckle dropping place and put, the most very likely during chin bar 2 falls Can impact on guard shield 6, thus cause the be damaged eyeglass of especially guard shield 6 of guard shield 6 and chin bar 2 to occur damaging；So this Utility model arrange chin bar 2 before the full process of full helmet position of being returned back by half helmet position in 1/3rd release member 13 to Few locking cam 11 and snap close cam 10 are completed the most complete unlocking motion, that is give guard shield 6 and leave enough responses Time, in order to allow guard shield 6 complete to bounce up and arrive maximum open position, by front when chin bar 2 arrives the top of helmet shell main body 1 The design in face understands, and when maximum open position, it is fully fallen in the rail of chin bar 2 procheilon M to guard shield 6 by split P institute cutting section Within trace T and they occur without crossing, it is seen that ensure that chin bar 2 is being returned back full helmet locations of structures by half helmet locations of structures Time this chin bar 2 and guard shield 6 do not collide interference, in figure 6 by the most this feelings of process shown by Fig. 6 (a) → Fig. 6 (b) Shape.

Release member 13 of the present utility model can have various structures, such as release member 13 can be set to swing rod structure (not shown): wherein this fork makees dead axle swing, arranges triggering pin and chute on fork, and described triggering pin can trigger Unlock cam 14, described chute and the protruding pin motion being arranged on rotation gear coordinates (not shown), transport when rotating gear 5 Chute can be stirred by protruding pin time dynamic and then driving fork makees oscillating motion that is release member makes unlocking motion；Especially, Release member 13 could be arranged to the axis of straight pin and this straight pin and arrange with the axis coaxle rotating gear 5 (as Fig. 4, Shown in Fig. 7, Fig. 8 and Figure 17), described straight pin with rotate gear 5 and be fastenedly connected or they are structure as a whole making, now justify Pin in fact can become an extension member of the spindle nose 5c rotating gear 5, and release member 13 is set to straight pin Way can simplify the structure of release member 13 to greatest extent and have simplest actuation step, thus is more excellent structure shape The release member 13 of formula.

This utility model is in order to adapt to the different demands of driver, and the dropping place of buckleing that guard shield 6 can be allowed to have different conditions is put: 1) such as when needs are exempted sand and dust interference and exempt rainwater interference, guard shield 6 and chin bar 2 is needed to have good stickiness, just As shown in Figure 1, Figure 2 with the state shown by Fig. 5 (a), now it is preferred that lip 2b of the lower limb 6b of guard shield 6 and chin bar 2 is in patch The location status closed；2) the most such as produce on guard shield 6 and within helmet shell main body 1 owing to driver breathes when needs disperse During water smoke or due to driver need a little outside cooling wind to reduce in the helmet heat time, be now required to micro-opening and protect Cover 6 and make its lower limb 6b be disengaged and be formed certain ventilative gap 6c(Figure 15 and Figure 16 with lip 2b of chin bar 2 and shown The most this state shown)；It should be noted that lip 2b of the lower limb 6b of guard shield 6 and chin bar 2 is in the position shape of laminating State refers to that this lower limb 6b and lip 2b present certain overlaying and articulation, and it includes the lower limb 6b that there are partial-length section Obvolvent lip 2b(now lower limb 6b is outside and including lip 2b, the most this situation of state that Fig. 1 and Fig. 2 is reflected), it Also including the lip 2b obvolvent lower limb 6b(now lower limb 6b that there are partial-length section lip 2b outside, in figure Not shown).Buckleing dropping place corresponding to guard shield 6 at above-mentioned two kinds to put, this utility model can allow locking cam 11 and snap close cam 10 there are two kinds of engagement lockup states: the first lockup state is that guard shield 6 is locked in and buckles dropping place and put and the lower limb of guard shield 6 There is laminating (as depicted in figs. 1 and 2) in lip 2b of 6b and chin bar 2, and the second lockup state is that guard shield 6 is locked in and buckles dropping place Put but there are ventilative gap 6c(between the lower limb 6b of guard shield 6 and lip 2b of chin bar 2 as shown in Figure 15 and Figure 16)；In order to That reaches above two guard shield 6 buckles state, and locking cam 11 can use following various engagement to assemble with snap close cam 10: 1) Snap close cam 10 includes and only includes a double wedge structure, and meanwhile locking cam 11 is provided with two and snap close cam The concave tooth structure (not shown) that 10 double wedge structures echo mutually, double wedge structure and the locking cam 11 of described snap close cam 10 Concave tooth structure can occur engagement and have two kinds of mesh combination, a kind of combination the first lockup state corresponding therein, another Plant the corresponding the second lockup state of combination；2) snap close cam 10 includes two double wedge structures, and meanwhile locking cam 11 sets It is equipped with two concave tooth structure (as shown in figs. 4 and 17) echoed mutually with snap close cam 10 double wedge structure, when snap close cam 10 Two double wedge structures correspond to the first locking occur when engaging with two concave tooth structures of locking cam 11 respectively simultaneously State, correspond to out when snap close cam 10 only double wedge structure constructs engage with a concave tooth of locking cam 11 Existing the second lockup state；3) snap close cam 10 includes and only includes a concave tooth structure, meanwhile locking cam 11 It is provided with two double wedges structure (not shown)s echoed mutually with snap close cam 10 concave tooth structure, described snap close cam 10 recessed Tooth structure can be nibbled with the double wedge of locking cam 11 structure and be associated with two kinds of mesh combination, and one of which combination correspond to the A kind of lockup state, another kind of combination correspond to the second lockup state；4) snap close cam 10 includes two concave tooth structures, with This simultaneously locking cam 11 be provided with two double wedges echoed mutually with snap close cam 10 concave tooth structure and construct (not shown)s, when Two concave tooth structures of snap close cam 10 correspond to out when engaging with two double wedge structures of locking cam 11 respectively simultaneously The first lockup state existing, nibble when a double wedge of snap close cam 10 only concave tooth structure with locking cam 11 constructs Correspond to during conjunction that the second lockup state occurs.Figure 17 gives locking cam 11 with snap close cam 10 by the first lockup state To the second lockup state until the process unlocked completely: Figure 17 (a) correspond to the first lockup state → Figure 17 (b) and correspond to The second lockup state → Figure 17 (c) correspond to complete released state, it should be noted that locking cam 11 and lock in fig. 17 Structure that button cam 10 uses and engagement assemble belong to above-mentioned listed various assemble in the second engagement assemble.

This utility model is in order to slow down guard shield 6 especially guard shield 6 when bouncing up to maximum open position during bouncing up Helmet shell main body 1 is produced excessive shock, can be at collet 3 or/and be provided for slowing down guard shield 6 in helmet shell main body 1 to bounce up end End impact delay component, this delays component can be spring (not shown), the air bag that can also be special (does not shows in figure Go out), can also is that amortisseur bar (not shown), wherein the component that delays of amortisseur bar structure has the simplest structure, it Can be the earth dyke columnar structure gradually raised, so during the bouncing up of guard shield 6 its supporting leg 6a gradually with delay component Fit and be gradually increased contact resistance, thus reaching the effect of damping buffering.

This utility model, in order to help chin bar 2 to cross guard shield 6 smoothly, especially allows when guard shield 6 is in maximum open position Chin bar 2 can cross the lower limb 6b of guard shield 6, can be at collet 3 or/and arrange expanded configuration in helmet shell main body 1, this distending structure Making the boss containing wedge configuration or the raised line of the surface elevation that can be a relative collet 3 or helmet shell main body 1, it is permissible Force and pitch outside 2a elastic deformation to help lip 2b of chin bar 2 to cross guard shield 6 lower limb being under the state of raising smoothly Not shown in 6b(figure), when chin bar 2 starts to cross guard shield 6, chin bar 2 can come in contact with expanded configuration, now at distending structure The constraint lower fork made will appear from 2a the effect out opened, and as a result by fork, the elastic deformation of 2a can be extended out and make chin bar 2 do not interfere with the side of the widest part of guard shield 6, thus realize helping chin bar 2 to cross the purpose of guard shield 6 smoothly；Need The widest part of bright is guard shield 6 refers to for the split P of helmet shell main body 1, and now two forks of chin bar 2 are 2a distance The width of the guard shield 6 presented at the farthest position of this split P.

This utility model compared to the outstanding advantages of prior art is, by using structure and mode, the energy of gear constraint Enough chin bar 2 is reliably made to carry out changing and keep the uniqueness of its locus and reversible between full helmet position and half helmet position Property.On the one hand collet 3 and the integrally-built integrity of chin bar 2 are maintained, and take this to ensure that these helmet core components have High intensity and high rigidity, thus it is effectively increased the safety in utilization of the helmet；On the other hand it is greatly decreased or even disappears completely Expose the line of rabbet joint except helmet shell main body 1 surface, take this to decrease the buzz noise that airflow passes helmet shell surface is derived from significantly, Thus it is effectively increased the wearing comfort of the helmet；Structural intergrity additionally, due to collet 3 and chin bar 2 improves and assembly difficulty Decline, and gear engagement belongs to reliable restraining structure, therefore can be effectively improved the reliability of the helmet.

Above-described embodiment is only some preferred embodiments of the present utility model, limits protection of the present utility model the most according to this Scope, therefore: all various equivalence changes done according to structure of the present utility model, shape, principle, this practicality all should be covered by new Within the protection domain of type.

Claims (18)

1. a variable jaw structure protecting type helmet based on gear constraint, it includes a helmet shell main body, a chin bar and two Individual collet, described chin bar has two fork handles split by helmet shell main body both sides, and said two collet is distinguished layout at helmet The two sides of shell main body, and these collets are securedly mounted in helmet shell main body or these collets are integrated knot with helmet shell main body Body plan is made；It is characterized in that: be provided with two fixed gears motionless relative to helmet shell main body, described the two fixed gear Split the both sides in helmet shell main body, be additionally provided with two and follow the rotation gear that chin bar is moved together, described the two Rotate gear and also split the both sides in helmet shell main body, be in the collet of helmet shell main body the same side, fork handle, fixed gear and turn Moving gear forms an associated slave together；In same associated slave, rotate gear with fork being mutually fastenedly connected or they Be structure as a whole making, and chin bar rotates gear movement by fork driving, when rotating gear and fixed gear generation gear motion Time fixed gear rotate the position of gear by promoting and phase place changes, now chin bar also occurs under the constraint rotating gear Position and the change of attitude also adapt to full helmet structure and the conversion of half helmet structure with this.

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 1, it is characterised in that: described Fixed gear and rotate gear and be roller gear pattern and their engaging mechanisms of being formed belong to face gear driver Structure, fixed gear therein be internal gear, rotation gear be external gear.

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 2, it is characterised in that: occur Intermeshing fixed gear and rotation gear, the pitch radius of its fixed gear, rotate gear pitch radius, and During engaging, chin bar turns over angle relative to helmet shell main bodyTime rotate the central angle that turns over accordingly of gear axis, described These parameters meet constraint formulations:。

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 3, it is characterised in that: described Layout fixed gear in same associated slave and collet is mutually fastenedly connected or they are structure as a whole making.

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 4, it is characterised in that: described Fixed gear includes first and fixes that gear teeth section and second fixes gear teeth section, described rotation gear includes the first rotation gear teeth section Rotate gear teeth section with second, the first rotation gear teeth section in same associated slave only fix with first gear teeth section engage, the Two rotation gear teeth sections are only fixed gear teeth section with second and are engaged.

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 5, it is characterised in that: same In one associated slave, first rotates axle center and second axis coinciding rotating gear teeth section of gear teeth section.

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 6, it is characterised in that: same In one associated slave, the second orbit of shaft center of the described first the first orbit of shaft center and the second rotation gear teeth section rotating gear teeth section exists Their point of intersection is tangent.

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 7, it is characterised in that: the end of at Torr is or/and offer arc groove in helmet shell main body, described arc groove participates in constraint and rotates the motion of gear and make retrained to turn Its corresponding fixed gear of moving gear keeps engagement.

A kind of variable jaw structure protecting type helmet based on gear constraint the most according to claim 8, it is characterised in that: the end of at Hold in the palm or/and be provided with elastic locking structure in helmet shell main body, the placement position of described elastic locking structure and the two ends of arc groove Head echoes mutually, and wherein the two ends of arc groove correspond to full helmet position and the half helmet position of chin bar respectively.

10. according to the variable jaw structure protecting type helmet based on gear constraint described in claim 1 to 9 any one, its feature Be: the described helmet is provided with guard shield, described guard shield when maximum open position its by helmet shell main body split institute cutting section Set and chin bar during movement by the track set overall situation of helmet shell main body split cutting section without occuring simultaneously.

The 11. variable jaw structure protecting type helmets based on gear constraint according to claim 10, it is characterised in that protect described in: Cover raise motion for fixed-axis rotation motion, and be provided with and bounce up the driving spring raising guard shield.

The 12. variable jaw structure protecting type helmets based on gear constraint according to claim 11, it is characterised in that: it is provided with Snap close cam, locking cam and locking spring, described snap close cam and guard shield are fastenedly connected or snap close cam is one with guard shield Body structure fabrication, locking cam and locking spring are installed in helmet shell main body or/and on collet, locking spring normality promotes locking Cam and snap close cam-engaged also can lock guard shield and buckle dropping place at it and put when guard shield is buckled.

The 13. variable jaw structure protecting type helmets based on gear constraint according to claim 12, it is characterised in that: it is provided with Release member and unblock cam, described unblock cam is fastened on locking cam or unlocks cam and is integrated knot with locking cam Body plan is made, and by chin bar fork, driving or by turning gear wheel drive, release member can solve release member as desired by driving The locking cam of lock-out state is made, with snap close cam, the unlocking motion being disengaged by lock cam and then driving locking cam.

The 14. variable jaw structure protecting type helmets based on gear constraint according to claim 13, it is characterised in that: in chin bar Before the full process of full helmet position of being returned back by half helmet position during three/one stroke, described release member is at least to locking Cam and snap close cam complete the most complete unlocking motion.

The 15. variable jaw structure protecting type helmets based on gear constraint according to claim 14, it is characterised in that: described solution Lock construction element is that the axis of straight pin and this straight pin is arranged with the axis coaxle rotating gear, described straight pin and rotation gear It is fastenedly connected or they are structure as a whole making.

The 16. variable jaw structure protecting type helmets based on gear constraint according to claim 15, it is characterised in that: correspondence is protected Covering on button dropping place to put, described locking cam there are two kinds with snap close cam and engages lockup state, and the first lockup state is for protecting Cover is locked in button dropping place and puts and the lip appearance laminating of the lower limb of guard shield and chin bar, and the second lockup state is that guard shield is locked Only put in button dropping place but between the lower limb of guard shield and the lip of chin bar, there are ventilative gap.

The 17. variable jaw structure protecting type helmets based on gear constraint according to claim 16, it is characterised in that: at collet Component is delayed for slow down that guard shield bounces up end impact or/and be provided with in helmet shell main body.

The 18. variable jaw structure protecting type helmets based on gear constraint according to claim 17, it is characterised in that: at collet Force fork that an outer elastic deformation is raised state lower shield helping chin bar lip to cross smoothly or/and be provided with in helmet shell main body The expanded configuration of lower rim.