• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a lining (1) comprising at least one weakness line (2) and intended to be positioned on an airbag flap, characterized in that the line (2) comprises a discontinuous opening profile (4) in the thickness of the lining (1), the cross section of which in a plane perpendicular to the plane of the lining (1) and to the plane of the weakness line (2) has the form of an ogive.
    公开号:ES2804621A1
    申请号:ES202090048
    申请日:2019-05-07
    公开日:2021-02-08
    发明作者:Pascal Emery；Laurent Autem；Hervé Bernard
    申请人:SMRC Automotive Holdings Netherlands BV；
    IPC主号:
    专利说明:

    [0002] Liner for airbag cover
    [0004] The present invention relates to the field of dashboard liners, and more particularly to that of airbag cover liners.
    [0006] At present, the realization of a protective lining for airbag covers is carried out by integrating into it a weakening of the thickness of the covering, in such a way that said weakening makes it possible to orient the tear of the covering when the cover is opened as a result of the inflation of the airbag of an airbag. A classical construction to carry out said weakening of the lining consists in making a hollow in the thickness of said lining.
    [0008] One of the difficulties that the construction of this weakening constantly presents consists in ensuring that the face of the cladding facing the passenger shows a reduced or even non-existent visibility of said weakening.
    [0010] Thus, the quality of the weakening is situated between, on the one hand, a deep recess that optimizes the guidance of the tear of the lining, but which runs the risk of being visible from the side facing the passenger and, on the other hand, a shallow recess, which limits the effectiveness of tearing the liner, but which is invisible on the passenger side.
    [0012] To optimize the depth of this void, but at the same time limiting the visibility of the liner on the face facing the passenger, a solution lies in drawing a line of weakness consisting of a discontinuity of the void. This separation of the successive recesses made in the thickness of the lining limits the visibility of the line of weakness on the face of the same facing the passenger, while maintaining the optimization of the guidance of the lining tear, thanks to recesses that are deep enough .
    [0014] However, if said discontinuity of the casting along a line of weakness makes it possible to reduce the visibility of said line of weakness of the coating on that of its faces that is oriented towards the passenger, the architecture of said discontinuity can also, in certain conditions, cause degradation quality of the liner tear. Furthermore, the realization of this discontinuity consisting of a line of weakening of the thickness of the coating can be difficult to implement in the field of a production structure.
    [0016] The present invention aims to alleviate said drawback of the prior art, by proposing a coating to cover an airbag cover that, on the one hand, allows optimization of the tear guidance regardless of the presence of a possible discontinuity of the emptying at the level of a line of weakness and, on the other hand, allows to facilitate its implementation in the field of a production structure.
    [0018] Thus, the invention has as its object a liner that comprises at least one line of weakness, and that is designed to be placed on an airbag cover, characterized in that the line includes a discontinuous pouring profile in the thickness of the liner, whose section in a plane perpendicular to the plane of the cladding and to the plane of the line of weakness has the shape of a warhead.
    [0020] The invention may be better understood thanks to the description that follows, and which refers to the preferred embodiments, which are offered by way of non-limiting examples, and which are explained with reference to the attached schematic figures, in which :
    [0022] - figure 1 is a schematic representation of an example of a casting profile according to the invention,
    [0024] - figure 2 is a schematic representation of an example of a casting profile according to the prior art,
    [0026] - Figure 3 is a schematic representation of an example of a recess along a line of weakness that integrates a series of steps according to the invention,
    [0028] Figures 4a and 4b are schematic representations of an example of the placement of the lines of weakness in a coating according to the invention for covering the airbag covers, prior to the inflation of the airbag airbag and during the same.
    [0029] FIG. 4c is a schematic representation of an example of the placement of the lines of weakness on a coating according to the invention, intended to cover a pair of airbag covers.
    [0031] FIG. 5 is a schematic representation of an exemplary embodiment of a line of weakness located at the edge of the airbag cover intended to undergo the greatest displacement.
    [0033] Figure 6 is a schematic representation of an example of embodiment of a line of weakness located in the extension of one of the ends of the line of weakness shown in Figure 5,
    [0035] FIG. 7 is a schematic representation of an embodiment of a line of weakness located at the edge of the airbag cover that forms a hinge,
    [0037] Figure 8 is a schematic representation of an example of embodiment of a line of weakness located at the level of the edge of the airbag cover and that carries out the connection between the edge of the airbag cover that undergoes the greatest displacement. and an airbag cover hinge,
    [0039] Figure 9 is a schematic representation of an example of the placement of one of the ends of the line of weakness consisting of an angle of connection with a second line of weakness,
    [0041] Figure 10 is a schematic representation of an example of the placement of one of the ends of the line of weakness consisting of a curved joint with a second line of weakness.
    [0043] The invention relates to a lining 1 comprising at least one line of weakness 2 and which is intended to be positioned on an airbag cover 3, characterized in that line 2 includes a discontinuous casting profile 4 of the thickness of lining 1, whose section in a plane perpendicular to the plane of the cladding 1 and to the plane of the line of weakness 2 it has the shape of a warhead.
    [0044] It is convenient to note that, contrary to what happens in the prior art to which reference has already been made, the emptying carried out within the framework of a line of weakness according to the invention is continuous and is not interrupted at any time along the line of weakness. The profile of this recess can present variations, especially with regard to its depth, for example, by the presence of steps 5, in such a way that the profile is modified along at least a portion of the line of weakness and thus presents a discontinuity. However, said gap profile discontinuity is achieved by maintaining, however, the gap continuity along the line of weakness.
    [0046] The realization of a line of weakness with a profile 4 of this type in the shape of a warhead makes it possible to tear the lining 1 at the level of the end of the warhead. The ogive-shaped recess profile 4 divides the two sections of the liner 1 intended to be separated. The advantage of this type of nose-shaped profile 4 is that it only includes a single tear point, with a single end. On the contrary, a rectangular shaped casting profile has two corners at its end, as is known in the prior art and of which an example is given, which is shown in figure 2, said corners then forming two points alternatives at the level of which the lining 1 tear can be carried out. This tearing alternative present at the level of several points implies a loss of quality of the lining 1 tear. Similarly, the ogive-shaped recess profile 4 makes it possible to impose a type of tear at the level of a single point, in such a way that the tear is carried out in a homogeneous way when said tear begins simultaneously at different points of the line of weakness 2.
    [0048] According to an example of construction, the depth of the recess corresponds to at least 50% of the thickness of the lining 1. The upper part or end of the ogive-shaped profile of the recess is thus situated beyond the first third of the thickness 1a of the liner 1 with respect to the outer surface 9a of the liner. According to a construction preference, the thickness of the coating 1 in the plane of the line of weakness 2 is between 0.4 mm and 0.8 mm, preferably being at least 0.6 mm.
    [0050] According to an possibly complementary construction example, the ogival profile has, on the one hand, a conicity with an angle situated around 18 ° with respect to an axis perpendicular to the plane of the surface 9 of the lining 1 and, on the other hand part, a rounded upper part whose radius is between 0.8 mm and 1.1 mm, and which ideally is of the order of 0.9 mm to 1 mm.
    [0052] The discontinuity of the casting profile 4 along the line of weakness 2 is mainly carried out by a series of steps 5 that successively carry out a break in continuity along the line of weakness 2. From According to the mode of construction of said steps 5, these can be presented in the form of a total or partial rupture of the void, that is, in the form of a total absence of void or the presence of a void of less depth in the thickness 1a of coating 1 along line of weakness 2.
    [0054] The presence of steps 5 along the line of weakness 2 makes it possible to keep together the two sections of the lining 1 divided by the line of weakness 2, limiting the risks of an inappropriate tearing of the lining 1. On the other hand, these Steps 5 also make it possible to limit, and even suppress, the visibility of the line of weakness 2 due to a use of the lining 1 linked to factors other than the inflation of the airbag of the airbag.
    [0056] According to a particularity of its construction, cladding 1 is characterized in that the union between two successive portions with the continuous profile of line of weakness 2 is carried out by means of a step 5 which, in a plane perpendicular to the plane of cladding 1 that contains the line of weakness 2, comprises at least one slope 5a between the upper part of the casting profile 4 and the upper part 5b of the step 5. The advantage of this inclination is that it facilitates construction when carrying out the cast by a milling operation. Indeed, milling can be carried out continuously by traversing each of the steps 5 without having to stop and restart milling later during the construction of a line of weakness 2.
    [0058] According to a specificity of construction, step 5 is characterized in that the slope 5a has an inclination 5c comprised between 40 ° and 50 ° with respect to an axis perpendicular to the plane of the surface 9a, 9b of the cladding 1, and which is ideally located around 45 °.
    [0059] According to a specificity of the embodiment of the steps 5, the upper part 5b of the step 5 is located at the same level as the inner surface 9b of the cladding 1. According to an alternative specificity of this particularity, the upper part 5b of the step 5 is located inside the thickness 1a of the lining 1 in such a way that there is still a gap between the upper part 5b of the step 5 and the interior surface 9b of the lining 1. In this way, and according to this alternative, the joint between two successive portions of the continuous casting profile of the line of weakness 2 is carried out by means of a step 5 whose upper part 5b is located retracted with respect to the inner surface 9b of the lining 1 at the level of a point where said lining lacks drainage. According to an example of construction, the upper part 5b of the step 5 is retracted with respect to the inner surface 9b of the cladding 1, which corresponds to a third of the thickness 1a of the cladding 1.
    [0061] According to a construction feature of the line of weakness 2, at least one step 5 comprises an upper part 5b whose length, in a plane perpendicular to the plane of the coating in which the line of weakness is included, is between 1 mm and 3 mm. It should be noted that the length of the step 5 increases the approach of the two sections of the lining 1 that are separated by the recess of the line of weakness. According to a construction specificity of this feature, the upper part 5b can have the shape of a plateau of constant height.
    [0063] According to another particularity of the construction, the distance separating two successive steps 5 is at least 4 mm. This distance of separation of the steps 5 is a function of the line of weakness 2 and specifically of the position of the line of weakness 2 with respect to the airbag cover 3 against which the lining 1 is intended to be positioned.
    [0065] Within the framework of a line of weakness 2 of the lining 1 destined to be located at the level of a part of the edge of the airbag cover 3 that is going to experience the greatest amplitude displacement and / or at the level of the inflation axis of the airbag of the airbag, this line of weakness has a continuous profile voiding portion 2a. This continuity allows an optimization of the tear at the point of the lining 1 at the level at which said tear must begin upon inflation of the air bag of the airbag, in such a way that said line of weakness 2 forms a first line of tear. According to a construction specificity of said continuity 2a, the distance separating two successive steps 5 is at least 50 mm. According to another specificity complementary to this particularity, the portion of the continuous casting profile 2a of the line of weakness 2 is substantially rectilinear.
    [0067] Within the framework of a line of weakness 2 of the lining 1 that extends at one of the ends of the portion of the continuous casting profile 2a located at the level of a part of the edge of the airbag cover 3 that is going to experience the displacement of greater amplitude and / or at the level of the inflation axis of the airbag of the airbag, the prolongation of the line of weakness 2 of the lining 1 is carried out by means of a discontinuous casting profile portion 2b comprising a plurality of steps 5 separated by gaps between 6 mm and 12 mm, and ideally equal to or greater than 9 mm. This discontinuity 2b of the line of weakness 2 of the liner 1 thus extends the first tear line from the point of initiation of the tear, located at the level of the continuous casting profile portion 2a.
    [0069] Within the framework of a line of weakness 2 of the lining 1 intended to be located at the level of a part of the edge of the airbag cover 3 that forms a joint or that carries out the connection with a joint, the line of weakness 2 comprises a discontinuous pouring profile portion 2c in which the distance separating two successive steps 5 defines gaps between 6 mm and 12 mm, ideally equal to or greater than 9 mm.
    [0071] Within the framework of a line of weakness 2 of the lining 1 intended to be located at the level of a part of the edge of the airbag cover 3 that carries out the connection between, on the one hand, the edge of the airbag cover 3 that goes to undergo the displacement of greater amplitude and, on the other hand, at least one articulation of the airbag cover 3, the line of weakness 2 is made by means of a discontinuous emptying profile portion 2d comprising a plurality of steps 5 separated by distances between 16 mm and 22 mm, ideally equal to or greater than 19 mm. This line of weakness thus forms a secondary tear line.
    [0073] According to a specificity of construction, when the junction between the line of weakness 2 that forms a first tear line, such as, for example, a continuous profile void portion 2a or a discontinuous profile void portion 2b that extends said portion , and a second line of weakness 8 that forms a tear line Secondary, such as for example a line of weakness 2d intended to be located at the level of a part of the edge of the airbag cover 3, is carried out at the level of a connecting portion having an angular shape 6, such as for example, a Right angle, the distance 7 that separates the last step 5 of at least one of these lines of weakness 2, 8 of the joint angle 6 is at least 4 mm. This distance makes it possible to limit the maintenance of the lining sections 1 at the level of the joint angle and optimizes the guidance of the tear from the primary tear line to the secondary tear line.
    [0075] According to another construction specificity, when the line of weakness 2 destined to be located at the level of a part of the edge of the airbag cover 3 responsible for carrying out a connection, drawing a curved line, with a joint, the distance between , on the one hand, the last step 5 of the curved portion 2d and, on the other hand, the first step 5 of the portion of the line of weakness 2c intended to be located at the level of the joint is equal to or greater than 12 mm. According to an example of construction, the minimum distance between the last step 5 of the line of weakness 2c intended to be located at the level of the joint and the limit between the line of weakness 2c intended to be located at the level of the joint and the line of weakening 2d destined to lie at the level of a part of the edge of the airbag cover 3 that carries out a curved joint is equal to or greater than 4 mm. Likewise, the minimum distance between the last step 5 of the line of weakness 2d destined to be located at the level of a part of the edge of the airbag cover 3 that carries out a curved connection and this same limit is equal to or greater than a 8mm.
    [0077] It should be noted that the invention is not limited to the embodiments described and represented in the attached figures. It is possible to introduce modifications, especially from the point of view of the constitution of the various elements, or by substitution of technical equivalents, without departing from the scope of protection of the invention.
    权利要求:
    Claims (12)
    [1]
    1. Covering (1) comprising at least one line of weakness (2) and which is intended to be positioned on an airbag cover (3), characterized in that the line (2) includes a discontinuous casting profile (4) in the thickness (1a) of the cladding (1) whose section in a plane perpendicular to the plane of the cladding (1) and the plane of the line of weakness (2) has the shape of a warhead.
    [2]
    Cladding (1) according to claim 1, characterized in that the connection between two successive portions of the continuous casting profile of the line of weakness (2) is carried out by means of a step (5) which, in a plane perpendicular to the The plane of the lining (1) that includes the line of weakness (2), comprises at least one slope (5a) between the upper part of the casting profile (4) and the upper part (5b) of the step (5).
    [3]
    Cladding (1) according to claim 2, characterized in that the slope (5a) has an inclination (5c) of between 40 ° and 50 ° with respect to an axis perpendicular to the plane of the surface (9a, 9b) of the cladding (1).
    [4]
    Cladding (1) according to one of the preceding claims, characterized in that the connection between two successive portions of the continuous casting profile of the line of weakness (2) is carried out by means of a step (5) whose upper part (5b ) is retracted with respect to the inner surface (9b) of the liner (1) at a point where said liner lacks void.
    [5]
    Cladding (1) according to one of claims 2 to 4, characterized in that the distance separating two successive steps (5) is at least 4mm.
    [6]
    Cladding (1) according to one of Claims 2 to 5, characterized in that at least one step (5) comprises an upper part (5b) whose length, in a plane perpendicular to the plane of the cladding, includes the line of weakness ( 2), is between 1 mm and 3 mm.
    [7]
    Cladding (1) according to one of Claims 1 to 6, characterized in that the line of weakness (2) comprises a portion of the continuous casting profile (2a) intended to be located at the level of a part of the edge of the cover of airbag (3) that will experience the greatest displacement and / or at the level of the inflation axis of the airbag airbag.
    [8]
    Cladding (1) according to claim 7, characterized in that the portion with continuous casting profile (2a) has a length of at least 50 mm.
    [9]
    Cladding (1) according to one of Claims 7 or 8, characterized in that the portion with a continuous drainage profile (2a) is straight and is extended, at least at one of its ends, by a portion with a discontinuous drainage profile (2b) comprising a plurality of steps (5) spaced at distances between 6 mm and 12 mm.
    [10]
    Coating 1 according to one of Claims 7 to 9, characterized in that at the end of the line (2) which forms a connection with another line of weakness (8) embodied by an angle (6), the distance (7) which separates, on the one hand, the last step (5) of at least one of these lines of weakness (2, 8) and on the other hand, the joint angle (6) is at least 4 mm.
    [11]
    Cladding (1) according to one of Claims 1 to 6, characterized in that the line of weakness (2) comprises a portion with a discontinuous pouring profile (2c) intended to be located at the level of at least one part of a joint of airbag cover (3), said portion with discontinuous emptying profile (2c) comprising a plurality of steps (5) separated by distances between 6 mm and 12 mm.
    [12]
    Coating according to one of Claims 1 to 6, characterized in that the line of weakness (2) comprises a portion with a discontinuous pouring profile (2d) intended to be located at the level of a part of the edge of the airbag cover (3 ) that carries out the connection between, on the one hand, the edge of the airbag cover (3) that is going to experience the greatest displacement and, on the other hand, at least one hinge of the airbag cover (3), including said portion with discontinuous casting profile a plurality of steps (5) separated by distances between 16 mm and 22 mm.
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    同族专利:
    公开号 | 公开日
    MA51931B1|2021-09-30|
    MA51931A1|2021-02-26|
    ES2804621B2|2021-07-29|
    SK1382020A3|2021-06-09|
    FR3081407B1|2020-05-22|
    BR112020023512A2|2021-02-09|
    FR3081407A1|2019-11-29|
    WO2019223993A1|2019-11-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2262262A|1991-12-11|1993-06-16|Takata Corp|An air bag cover.|
    DE102005012720A1|2005-03-19|2006-09-21|Volkswagen Ag|Preparation of a multi-layered lining element, useful for e.g. the manufacture of an instrument panel for a motor vehicle, comprises producing a visible slush layer from thermoplastic elastomers; and melting the visible slush layer|
    FR2923759A1|2007-11-15|2009-05-22|Visteon Global Tech Inc|Fascia manufacturing method for motor vehicle, involves realizing visible layer, mounting visible layer on substrate by connection layer, and realizing pre-weakening line, where line defines flap of air bag|
    US20090283993A1|2008-05-14|2009-11-19|Paul Finch|Instrument panel having an airbag therein and method for forming thereof|
    法律状态:
    2021-02-08| BA2A| Patent application published|Ref document number: 2804621 Country of ref document: ES Kind code of ref document: A1 Effective date: 20210208 |
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1854236A|FR3081407B1|2018-05-22|2018-05-22|TRIM FOR AIRBAG SHUTTER|
    PCT/EP2019/061614|WO2019223993A1|2018-05-22|2019-05-07|Lining for an airbag flap|
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