CN103476641A

CN103476641A - Hood lifting arrangement and method for producing an actuator

Info

Publication number: CN103476641A
Application number: CN2011800701449A
Authority: CN
Inventors: S·孔奇
Original assignee: Autoliv Development AB
Current assignee: Autoliv Development AB
Priority date: 2011-04-18
Filing date: 2011-04-18
Publication date: 2013-12-25
Also published as: EP2699456A1; EP2699456A4; WO2012144940A1

Abstract

The invention relates to an actuator (1) for a hood lifting arrangement in a vehicle safety system in order to provide protection for a pedestrian hit by the vehicle and a vehicle comprising such a system including the actuator (1). The actuator (1) comprises a housing (2) having a first end (3) and a second end (4) and a piston (5) having a first end (6) and a second end (7) adapted to fit in the housing (2). The first end (3) of the housing (2) is adapted to comprise or be connected to a power source and the second end (4) of the housing (2) is provided with an opening (10) through which said piston (5) will extend when the actuator (1) is activated. The piston(5) comprises a non-metallic material, e.g. a plastic polymer. The piston (5) may be made completely by one or several non-metallic materials or compositions. The piston (5) may be in the form of a central stem (12) provided with bars (11) stretching along the length of the stem (12) and attached to the stem (12) by a first longitudinal edge of the bar (11). The bars (11) are stretching radially outwards from the stem (12). Optionally may the distal longitudinal ends of the bars (11) be connected to each other by ring shaped elements (13).The invention further relates to a manufacturing method for an actuator (1) comprising a housing (2), a piston (5) and a pyrotechnic device (9).

Description

Bonnet bont and method for the manufacture of actuating unit

Technical field

The present invention relates to a kind ofly for the bonnet of motor car of lifting vehicle safety system or the actuating unit of engine case, think by the pedestrian of Vehicular impact protection is provided.

Background technology

Have been observed that, if power actuated vehicle and pedestrian are clashed into, the bumper/spoiler of vehicle clashes into pedestrian's shank or the lower part of the body usually.Therefore, pedestrian's shank will be pushed to direction of traffic usually, and head can tilt towards bonnet and the Windshield of vehicle with common above the waist.This banking motion often causes pedestrian's head and above the waist at first touches bonnet, and afterwards, if the impulsive force brought by shock enough large and vehicle continue to move ahead, pedestrian's head also can contact Windshield with the upper part of the body.

In order to minimize the injury to the pedestrian caused by above-mentioned impact, proposed to use the bonnet bont of some types.These devices are constructed so that the rear portion of bonnet usually, and the part that approaches most Windshield gets a promotion.Such device is for example at WO2007/067121 and EP2, disclosed in 256,007.When the Vehicular impact pedestrian, bonnet can provide efficient, flexible impulsive force absorbing structure usually.Yet, if bonnet does not promote, to have following higher risk: bonnet will be out of shape to a certain extent, make hard, part inflexibility (for example powerplant module) of bonnet below come in contact with bonnet, can make between vehicle and pedestrian and occur to impact hardy, this is undesirable.In addition, the rise at bonnet rear portion will make the surface of bonnet tilt further, thereby contribute to reduce the moving velocity of health towards Windshield.And between Windshield and bonnet, less acute angle will contribute to weaken the severe circumstances of the human body after clashing into car body.Therefore, use a kind of safety device for the active that promotes bonnet to contribute to reduce significantly the injured risk of the human body after clashing into car body.

In order to promote bonnet, exist multiple different from this suggestion how to design of bonnet lifter.A kind of suggestion is to use certain piston and housing, will promote piston and reach outside housing when housing activated, and cause thus the lifting of bonnet or engine case.Such bont is at for example JP2008-075739 and US6, disclosed in 530,449.

Summary of the invention

Although above-mentioned prior art provides the embodiment as the actuating unit of bonnet lifter, still need on functional and reliability, to the bonnet lifter, be improved.Purpose of the present invention is to provide a kind of actuating unit especially, wherein can be in the situation that lower cost be manufactured the bonnet lifter, the function of this bonnet lifter is, after even vehicle uses the several years, when this actuating unit does not activate, the actuating unit that still can avoid the impact due to environment to cause aging.The present invention proposes a kind of piston especially, and this piston is included in housing, and this housing is formed for promoting the part of the described actuating unit of bonnet.

Piston of the present invention comprises non-metallic material.This material is for example plastic polymer, for example nylon (PA) or polybutylene terephthalate (PBT), and this plastic polymer can also be strengthened by different materials, for example with the glass fibre of 15%-50% content, mixes.Other embodiment can also be used carbon fiber.Can also use the metal-cored or bar for example, covered by non-metallic material (plastic polymer).Normally, for the purpose of the weight that reduces manufacturing cost and actuating unit, the piston that expectation is manufactured does not comprise metallic material.For ease of the manufacture of piston, expectation can be manufactured piston with homogenous material or material blends, for example mold pressing or extruding plastic or polyblend and form piston from a homogenous material batch.Yet, sometimes use metallic material also can there is the piston of reinforcement, for example, although use alternatively non-metallic material (bar of being made by carbon fiber or other similar materials) also to can be used in the carrying structure of reinforcement.

To piston, use non-metallic material will improve be concerned about problem, for example, may cause the problem of oxidation of piston corrosion.If piston corrosion, when actuating unit activated, piston may be stuck in housing and can not successfully operate.Therefore, with the common actuating unit that is provided with metallic piston, compare, actuating unit of the present invention can be constructed in simpler mode, and the common actuating unit that wherein is provided with metallic piston needs piston to be processed by more effective sealing and/or special surface, with oxidation or the corrosion of avoiding piston.

As mentioned above, piston can only be made by non-metallic material or by the compound of metal and non-metallic material.Although piston has comprised metallic material, preferably, piston comprises that volume is at least 50% non-metallic material, for example, when metal construction is used for the center bar of reinforcement.In some cases, also may need to comprise that volume is 10% or the widget of reinforcement metal structure still less, for example with for using salver or other analogues to strengthen the strengthening part of piston on piston base, this strengthening part will be subject to the effect of king-sized power between period of energization.

For the manufacture of the non-metallic material according to piston of the present invention, can be for example plastic material, as the PA6(polyamide (nylon) 6 be mentioned).In the situation that does not comprise other metals or nonmetallic reinforcement or carrying rigid construction, preferably, plastic material mixes and strengthens by the other materials with for example glass fibre, so that piston bears better, acts on the powerful power on piston when activating.For the piston of being made by the homogenous material compound, suitable material can be for example PA6, and it has mixed weight and has accounted for 30% glass fibre.Although PA6 is as a kind of embodiment of suitable plastic polymer, also there are to those skilled in the art multiple other suitable plastic polymers for the manufacture of piston.

Piston can be the solid bar with circular cross section, or is fabricated to hollow pipeline section.If piston is fabricated to hollow pipeline section, the metal of strong loading material or non-metallic rods (hollow or solid) will be inserted in hollow shell.This stirrup extends or extends along the longitudinal length direction of piston, and usually has and at least be equivalent to half length of piston length.Most applications is that stirrup at least extends along the length of piston 80%.If use the metal stirrup, it will extend along the whole length of piston substantially.Each end of piston can be provided with protector, and for example the non-metal sealing member, contact to prevent metal bar and the direct of external environment.Preferably, piston is fabricated to and makes the surface portion that with metallic material, does not form piston, thereby avoids metal and the direct of outside air to contact.

Typically, (circle) piston is of a size of: its cross-sectional diameter is in 14-20 millimeter scope, and length is in 60-100 millimeter scope.

Certainly, the piston rod can also have other size and dimensions.Piston can for example comprise rib with prolongation or rod or the center link of flange, and rib or flange are attached on center link along the length direction of center link by their longitudinal edge.The outward appearance of the radial cross-section of piston is equivalent to have the center hub of a plurality of spokes (spokes) or rib (bars), and wherein spoke or rib extend radially outwardly from center hub.Bar and attached flange thereon or rib will be basically extend to the second end of piston along the total length of piston from the first end of piston, to form piston.This piston can be designed so that its bottom has the cross-sectional plane corresponding with the size of inner walls and geometric configuration, and the middle part of piston has size and the geometric configuration that is applicable to be assembled in opening, wherein, when actuating unit activated, piston will extend through opening.In the situation that piston comprises center link and attaches to flange or the rib on center link, piston can be constructed so that a part that is positioned at the rib on bottom extends to the inboard of housing diametrically always from bar, and this part has diminishing radially extension on bottom, until limiting with opening (while activateding, piston will extend through this opening) face of housing, the radical length of rib adapts or a little less cross-sectional plane.Therefore, the size of the main portion of piston length is set as forming usually can be through the main part of this opening, and form the piston base of increasing than small part on piston longitudinal extension direction, the function of this piston base is, can be as the stop part of this piston when the extended position of its actuating state of piston arrives.

The far-end of flange or rib (being the end of flange away from center link) can equidistantly be arranged each other and can equidistantly arrange from the described center link of distance.Therefore, preferably, the shape of flange is identical and locate symmetrically around described bar.The concrete quantity of the flange used is unimportant, still, should the rarest three flanges that attach to bar, to be stabilized in the piston in housing.Although may use more quantity, the quantity of flange is generally 3-8.

Rib or flange can be connected to each other by a plurality of annulus at the free end of its far-end, and described annulus is along the length of piston, each other with required distance location.Such design provides a solid structure, and this structure is suitable for manufacturing the piston of plastic material, uses less material simultaneously, thereby lowers material cost and the weight of piston.

Design piston by the mode with suitable, can be so that piston for example have before piston activated in the characteristic of opening part tight seal, when actuating unit activates, piston will be pushed through this opening.Alternatively, cylinder can be provided for the elasticity O type circle of piston at opening part, so that tight seal to be provided.Also be easy to be, arrange piston at the other end tight fit inside towards housing wall so that piston is when activateding, piston is promoted effectively.Therefore, than metallic material, due to the material behavior of suitable non-metallic material, use the piston of plastics for example or other materials to have and obtain required close-fitting advantage between piston and housing.Therefore, can also form tight seal at front end, and form airtight closely cooperating at the other end of piston base and housing.

Above-mentioned actuating unit is designed for the formation parts of bonnet bont in the pedestrains safety system especially, and in this pedestrains safety system, actuating unit is used as the bonnet lifter.Such bonnet lifter has special environmental resistance, because the position that this bonnet lifter is in can suffer the moisture of external environment, the erosion of dust, and will bear the relatively violent temperature traverse that the heat by engine parts brings.

Therefore, the piston of completely or partially being made by plastics or similar material can have multiple benefit, such as weight, cost with to tolerance of oxidation and erosion etc.If the piston rod is made by plastic material fully, these advantages are obvious especially.Yet, be difficult to find a kind of homogenous material to be suitable for manufacturing whole piston.Therefore, different structure for piston, can make piston with two or more different non-metallic materials or complex, for example more by force and harder material for building carrying structure, and softer material is used to form and seals and provide required closely cooperating between piston and housing.

Compare and use metal to manufacture piston fully, the further advantage by piston, using non-metallic material to obtain, can more easily form deformable and folding structure.Piston can be designed as the motion that utilizes distortion to slow down piston, so that the level and smooth backstop moved for piston to be provided, thereby avoids or weaken the vibration of the bonnet promoted by piston that is stopped causing by piston moment.In addition, this piston can also be designed to make distortion can contribute to improve the sealing of opening part (can extend through this opening at the actuating primary piston), thereby extends the length of the halt (stay up time) of piston.

Be suitable for the piston of working in order to manufacture in the actuating unit for promoting bonnet, for example, power when non-metallic material (, plastics polymer composition) or material to be used must be chosen as and can stand piston and activated.

According to one embodiment of the present invention, cylinder can or comprise non-metallic material by the non-metallic material manufacture, and for example housing is made by the complex that comprises carbon fiber.Yet, when actuating unit activated, because housing must stand sizable pressure, housing can also comprise metal reinforcement.By piston and the housing that non-metallic material is provided, can eliminate the risk that these parts of actuating unit weather.

The present invention relates to a kind of vehicle that comprises the bonnet bont, this device comprises actuating unit disclosed herein.Bonnet lifter described herein can be for example at US6, in the system of describing in 530,449, and replace the actuating unit that there is described.

The actuating unit that comprises the piston of being made by plastic material can be according to following process manufacture.Plastic piston is introduced to (can be for example the pipe of cold-forging metal cylinder) in housing.Piston can be fabricated to housing and coordinate, and with the top at pipe (i.e. the end of pipe, when piston activated, piston will extend through the end of this pipe), provides tight seal.Alternatively, the part of the formation of piston sealing is made by other materials, preferably, is the softer material of the main part than actuating unit, because compare the bearer properties of the main part of piston, may more need the characteristic of sealing.Similarly, for the bottom of the piston of the inside face of seal casinghousing or at least the part of piston can comprise softer material, provide and closely cooperate between bottom with the inboard and described piston at housing, thereby, when actuating unit activated, guarantee actuating effectively and the lifting of piston.The plastics that described softer material can be softer type, rubber or other suitable materials.

Once piston is inserted into the rest position in its housing, just can operate second end (piston inserts through this second end and extends through this second end) of housing when activateding.This end is modified so that its cross-sectional plane narrows down to following degree, and the main part of piston can be through this end the time, the piston base of increasing by this end stop through.This pipe can be operated by crooked (crimping).Then, after actuating unit activates, when the bottom of piston reaches narrow section, described opening will be as the stop part of piston.This opening can also comprise detent, is for example the transversal zone slightly narrowed down of the housing near final backstop place, and whereby, before piston finally stops, piston will slow down in level and smooth mode.Preferably, piston also is designed to when described pipe is bent in end, can between the opening of piston and housing, form tight seal.

When the thermoelectricity lotus of actuating unit set-point, the first end (lower end) that ignition device can Inserting Tube.Equally, in this case, the operation pipe makes its cross-sectional plane dwindle and stops ignition device to deviate from pipe.Dwindling of this cross-sectional plane around ignition device of pipe, and/or pipe can be realized by bending the dwindling of cross-sectional plane of this end.

Described method is implemented as follows: at first introduce piston and operate subsequently the end of housing to be formed for the stop part of piston, then ignition device is passed through, in the other end inlet tube of pipe, to operate subsequently this other end so that this ignition device is fixed in pipe.Selectively, at first ignition device is introduced by first end (this first end will be operated subsequently), then piston is introduced to the other end and is also operated subsequently the second end of pipe.The additive method of assembling actuating unit is: at first insert piston and ignition device, and operate subsequently first end and second end of housing.

Said method discloses the effective means of Manufacture Execution mechanism.However, it is evident that, actuating unit can also be manufactured by other means, and stopper section and detent can be by making in the inboard projection that forms of housing, and plug or threaded cap that ignition device can tighten on the threaded portion of housing by use are fixed.

The accompanying drawing explanation

To, by the embodiment of describing explicitly with following accompanying drawing, set forth further the present invention.

Fig. 1 a-1d disclose according to the actuating unit of embodiment of the present invention with and major part;

Fig. 2 a-2g discloses the cross sectional drawing according to the different embodiments of piston of the present invention;

Fig. 3 a-3d discloses the actuating stage of the actuating unit of embodiment of the present invention;

Fig. 4 a-4e discloses the manufacturing process of the actuating unit of embodiment of the present invention.

The specific embodiment

Fig. 1 a discloses a kind of actuating unit 1, and this actuating unit comprises housing 2, piston 5 and ignition device 9.Accompanying drawing has shown the piston 5 that is positioned at housing 2 and the schematic diagram of ignition device 9, and housing 2 is dissectd by the direction along its longitudinal extension.Housing 2 is hollow cylinder or pipeline section shape, has first end (lower end) 3 and the second end (upper end) 4, and piston 5 for example, made by non-metallic material (plastic polymer material) at least in part, and piston 5 has piston base 14 at its downside first end 6 places.Piston 5 comprises longitudinal extension flange or the rib (bar) 11 that a plurality of length along piston 5 is extended, and this rib 11 is attached to center link 12(in first vertical side and sees Fig. 1 b) upper, and this rib 11 is orientated from this center link 12 radially outward.Rib 11 interconnects by a plurality of annulus 13 at its another far-end, thereby forms the shape of cross section that is similar to the wheel with the center hub that is provided with spoke.Housing 2 is provided with to projecting inward flange 8, this flange 8 as the separator of cylinder and for support piston 2 and ignition device 9(its as the propulsion source when activating described actuating unit).Ignition device 9 is positioned at the first end 3 of housing 2 and is connected with cable 17, and this cable 17 is connected to the control unit of the actuating for triggering actuating unit.The second end 4 at housing 2 is provided with opening 10, and after actuating unit 1 activated, piston 5 extends through this opening 10.On the top of housing 1, approach the second end 4 places of housing, housing narrows down so that the part of the adjacent openings 10 of housing 2 forms the backstop section 15 for the piston base 14 strengthened, with final backstop piston 5 when actuating unit 1 activated.The part that is sitting at 15 belows, stopper section of housing 2 is narrower than the main part of housing 2 a little, and forms detent 16, so that the piston base 14 strengthened will be squeezed and slow down it and move before finally reaching stopper section 15.Detent 16 shown in present embodiment is by by housing 2, the cross-sectional plane towards its second end 4 narrows down a little and forms, simultaneously the narrow degree in stopper section 15 is larger and divide and match preferably suitable for the cone form with piston base 14, and piston base 14 is connected in piston main body section 18 to the movement with final backstop piston.

Fig. 1 b has shown the radial cross-section view of actuating unit 1.Clearly illustrated the structure of piston 5 in this view, this piston 5 comprises center bar or the bar 12 with flange or rib 11, and rib 11 extends radially outwardly from center link 12, so that this view is similar to the wheel with the wheel hub that is provided with spoke.In this view, also it is evident that, the part of flange or rib 12 has formed piston base 14(and has seen Fig. 1 a), shown in dotted line, can not pass the narrow section of the opening part of the stopper section 15 that has formed housing 2.

Fig. 1 c discloses the lateral plan of piston 5, and this piston 5 comprises the piston base 14 that is positioned at its downside first end 6, middle piston main body section 18 and is located thereon the anchor portion 19 of end the second end 7.Piston comprises longitudinal extension flange or the rib 11 extended along the length direction of piston 5, and this rib 11 attaches to center link 12(in first vertical side and sees Fig. 1 b).At another far-end of flange, the distance of flange 11 to select, be attached on annulus 13 along the longitudinal length direction of piston 5, so that this Stability Analysis of Structures.At the first end 6 of piston 5, the cross-sectional plane of piston 5 strengthens to form bottom 14.This bottom 14 is suitable for the tight fit inside with housing, for example, so that the adherence pressure that piston can origin ultromotivity source (electric charge of lighting a fire) is activated effectively.Bottom 14 with housing in the part of side contacts can comprise the material softer than for example, non-metallic material for piston 5 main parts (being used to form the carrying structure of rib and center link), between bottom 14 and housing, to provide gas tight seal.Similarly, close to the top (side edge for the opening with housing is touched) of piston 5 main parts 18 of anchoring section 19, also can comprise softer material, think that actuating unit provides the actv. sealing, thereby prevent that dust or moisture from entering actuating unit.

Although shown piston 5 has anchor portion, this anchor portion is provided with ring-shaped article, and the top of this piston can also be common plane or the shape needed arbitrarily.

Shown housing 2 in Fig. 1 d, the support lugn 8 that this housing 2 is positioned at housing 2 inboards is divided into two parts.The part that comprises first end 3 of housing is suitable for holding the igniting electric charge, comprises that other housing parts of the second end 4 are suitable for holding piston, and support lugn 8 is suitable for inserting housing 2 rear support piston and ignition devices at piston and ignition device.Flange 8 can also preferably be designed to have larger opening, and this opening is between two cabins of housing 2, so that for example, effectively promote piston from the expanding gas of propulsion source (ignition device).Preferably, according to the housing 2 of present embodiment, be fabricated to: after piston is introduced housing 2, when piston is positioned at housing, manufactures near opening 10(and be positioned at upper end the second end 4) wedge shape stopper section 15 and the detent 16 of the shell inner surface that narrows, finally form housing.Narrow section can be for example by the crooked of cold forging pipe or within it the prefabricated projection of side make.

Above-mentioned piston is mainly for example, by being used one or more non-metallic materials (the PA6(nylon of being strengthened by glass fibre) fully) manufacture fully, and alternatively, with other material or reinforcement structure, combine.However, it can also comprise the carrying structure of metallic material, and center link can for example comprise metal bar.

In Fig. 2 a-2g, advised being suitable for the difformity of the piston of actuating unit according to the present invention, and that these figure demonstrations is the radial cross-section figure of these different embodiments.

Fig. 2 a discloses the piston-shaped of the disclosed shape of a kind of Fig. 1 of being similar to, but this piston-shapedly only has six " spokes " (actual for rib or flange) rather than eight.And, in the manner, alternatively, comprise the center link of being made by the non-metallic material of metal or reinforcement.

Fig. 2 b discloses a kind of solid piston, and this piston has circular radial section shape.This piston is made by non-metallic material.

Fig. 2 c discloses a kind of piston that forms hollow cylinder or pipe, and this piston is made by plastic material.In Fig. 2 d and 2e, demonstration be plastic pipe, at the central part of pipe, by carrying rod and carrying pipe, strengthen respectively, this carrying rod and the use of carrying pipe are different from the other materials of outer tube material therefor.The material of strengthening structure can be metal or non-metallic material.

In Fig. 2 f-Fig. 2 g, the difformity of the solid piston of making by homogenous material or compound is disclosed.Fig. 2 f discloses a kind of piston with cross-like cross-section, in Fig. 2 g, is the shape of cross section of circular piston, and this circular piston arranges four semicircle cut portions symmetrically at its edge.And in Fig. 2 h, be octagon-shaped.If necessary, these pistons of advising also are provided with and strengthen structure (for example carrying center bar).Making piston not be shaped to can may be favourable with the tight fit inside of housing, for example has the cross-sectional plane of disclosed piston in Fig. 2 f-Fig. 2 g, and when housing is circle, these piston cross-sectional planes are non-circular shape.By designing by this way piston and housing, the friction force between piston and housing can reduce, and piston to be stuck in the risk of housing inboard also lower.

Fig. 3 a to Fig. 3 d discloses actuating unit different stage in actuation process.Shown the actuating unit in idle state 1 before activating in Fig. 3 a.

In Fig. 3 b, actuating unit activates by triggering ignition device 9, and piston 5 starts to shift out a step by a step the opening 10 in cylinder 2.

In Fig. 3 c, the piston base 14 of increasing has arrived the position that housing narrows down, and the detent 16 in cylinder 2 inboards starts effect in this position.When piston 5 is moved further while extending through opening 10, piston base 14 will start distortion to a certain degree, and the movement of piston simultaneously will be braked or slow down.

In Fig. 3 d, piston 5 has arrived its end position, and in this position, piston 5 is promoted by the pressure in cylinder 2, so that the cone part of piston base 14 is shelved on the wedge shape stopper section 15 of cylinder 2.

It should be noted that as shown in Fig. 3, detent 16 and the wedge shape stopper section 15 of housing 2 of cone shape that is applicable to the bottom 14 of piston 2 comprises beneficial characteristics, and this beneficial characteristics is particularly suitable for plastics or non-metal piston.Yet, plastic piston can also have other shapes certainly, and can be the solid bar of the common substrate that is provided with increasing, can be for example following piston: there is common T font longitudinal cross-section profile, and there is stop part on housing top and take the alteration of form (common edge that for example can be vertical as the inwall with cylinder) that is suitable for this piston base.

In Fig. 4 a to Fig. 4 e, disclose as how the embodiment according to actuating unit of the present invention is assembled and manufactured to housing 2 and the piston 5 of hollow cylinder or form of tubes.

In Fig. 4 a, shown housing 2, in the inner projection that forms support lugn 8 that is provided with of pipe, can limit the rest position of piston and ignition device.Housing 2 can be for example the cold forging pipe fitting be made of metal.

In Fig. 4 b, shown and how piston 5 has been introduced in housing 2.Piston is introduced into through the opening 10 of the second end 4 that is positioned at pipe.Piston 5 can be made for, and the part of the formation sealing of piston is made by comparing the material that its carrying structure is softer.

In Fig. 4 c, shown when piston 5 has been positioned in housing 2, pipe is being bent near its second end 4 places, to provide narrow section that forms stopper section 15 and detent 16, and can provide piston 5 and Guan Guan the second end closely cooperate to form tight seal.Therefore the cross-sectional plane that housing 2 dwindles will provide the effective sealing of actuating unit before it activated, and can, when actuating unit 5 activated, form the backstop limited part for the increasing bottom 14 of piston 5.

In Fig. 4 d, ignition device 9 is introduced housing 2 from the first end 3 of housing 2.

In Fig. 4 e, housing 2 is bent so that ignition device 9 remains on desired position at the end of pipe 2 first end 3, and ignition device is clamped between crooked end 3 and support lugn 8, thereby prevents that it from deviating from from housing 2.

When assembling during actuating unit, can complete assembling according to shown in above-mentioned figure.However, also can introduce ignition device swan-neck near an end of this ignition device, piston is through in the other end inlet tube of pipe afterwards, and this end of swan-neck thereupon.Also selectable mode is, introduces piston and ignition device, afterwards in the corresponding end of pipe or approach crooked this pipe of this corresponding end.When manufacturing above-mentioned actuating unit, being characterized as of core, from respective ends is introduced housing, implement bending operation to described end at device (being piston and ignition device).

Claims

1. an actuating unit (1), this actuating unit (1) is for the bonnet bont of Vehicle security system, think by the pedestrian of Vehicular impact protection is provided, described actuating unit (1) comprises housing (2) and piston (5), described housing (2) has first end (3) and the second end (4), described piston (5) has first end (6) and the second end (7), described piston (5) is suitable for being assembled in described housing (2), the described first end (3) of described housing (2) is suitable for comprising or being connected to propulsion source, and described second end (4) of described housing (2) is provided with opening (10), after described actuating unit (1) activated, described piston (5) will extend through described opening (10),

It is characterized in that,

Described piston (5) comprises non-metallic material.

2. actuating unit according to claim 1 (1), is characterized in that, described piston (5) comprises the non-metallic material that accounts at least 50% volume.

3. actuating unit according to claim 1 (1), is characterized in that, described piston (5) comprises the non-metallic material that at least accounts for 90% volume.

4. according to the described actuating unit of aforementioned any one claim (1), it is characterized in that, the outside face of described piston (5) is covered by non-metallic material.

5. according to the described actuating unit of aforementioned any one claim (1), it is characterized in that, described piston (5) comprises the reinforcement metal rod, and this reinforcement metal rod extends along the longitudinal length of described piston, and this reinforcement metal rod has 50% length of the length that at least is equivalent to described piston.

6. actuating unit according to claim 5 (1), is characterized in that, described metal bar extends along the longitudinal length of described piston, and this metal bar has 90% the length that at least is equivalent to described piston length.

7. actuating unit according to claim 1 (1), is characterized in that, described piston (5) only consists of non-metallic material.

8. according to the described actuating unit of aforementioned any one claim (1), it is characterized in that, for the described non-metallic material of described piston (5), comprise plastic polymer.

9. according to the described actuating unit of aforementioned any one claim (1), it is characterized in that, described piston (5) is extended to described second end (7) of described piston center link (12) by the described first end (6) from described piston forms, described bar is provided with at least three ribs (11), described rib (11) is along the length of described bar (12) and extend, described rib (11) is attached on described bar (12) by first edge of this rib (11), and described rib (11) extends radially outwardly from described bar (12), until the second far-end of described bar (12).

10. actuating unit according to claim 9 (1), is characterized in that, the described remote edge of described rib (11) is equidistantly arranged to each other, and the described center link of distance (12) is equidistantly arranged.

11. according to the described actuating unit of claim 9 or 10 (1), it is characterized in that, the described remote edge of described flange (11) is connected to each other by a plurality of ring-shaped articles, described ring-shaped article is arranged along the length of described piston (5) with required distance.

12. according to the described actuating unit of aforementioned any one claim (1), it is characterized in that, described actuating unit (1) comprises the housing (2) of completely or partially being made by non-metallic material.

13. a vehicle, this vehicle comprises the bonnet bont, it is characterized in that, described bonnet bont comprises according to the described actuating unit of any one (1) in claim 1-12.

14. the method for the manufacture of actuating unit (1), described method comprises the steps:

A) from first end (3), ignition device (9) is introduced housing (2);

B) from the second end (4), piston is introduced described housing (2);

C) the described first end (3) at housing (2) operates described housing (2), so that the cross-sectional plane of described housing narrows down to following degree, stops described ignition device (9) through described first end (3);

D) operate described housing at described the second end, so that the cross-sectional plane of described housing narrows down to following degree, make the main part of described piston (5) can be through being positioned at the described opening (10) of described the second end, and the described bottom that simultaneously stops described piston be through this opening (10).

15. method according to claim 14, is characterized in that, described the dwindling by bending of the cross-sectional plane of described housing (2) realized.