• 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 method of forming a spacer (3) extending at least partially in the length of a central bore (4) passing right through a barrel (2a) of a base (2). ) an accelerometer sensor (1), the central bore (4) being intended to receive a fastening element (5) solidarisant the base (2) against a support element, the fastening element (5) being centered by the spacer (3), the base (2) being surrounded at least partially by a coating (7) of an overmolded plastic material. When overmolding the plastic material around the base (2) to form the coating (7), a portion of the plastic material passes through the barrel (2a) to form the spacer (3) making it integral with the coating (7). The invention also relates to a base with at least one channel for the passage of the plastic material and an accelerometer sensor provided with such a base.
    公开号:FR3047801A1
    申请号:FR1651130
    申请日:2016-02-12
    公开日:2017-08-18
    发明作者:Xavier Vermelle；Est Jeroen Van
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    The present invention relates to a method of forming a spacer extending at least partially in the length of a central bore passing right through a barrel of a base of an accelerometer sensor, a base for the implementation of the method and a sensor with a base provided with such a spacer.
    Such an accelerometer sensor comprises a base with a shank having a central bore receiving a fixing element for securing the accelerometer sensor against a support element. The central bore includes a spacer encircling the fastener for centering it in the central bore. A coating of a plastic material is overmolded around an outer wall of the base.
    In what follows the accelerometer sensor will be described as being a knock sensor with a fastener in the form of a specifically referenced screw. This is purely illustrative and not limiting, the accelerometer sensor and the fixing element may be other.
    It is known to set a knock sensor on the crankcase or the cylinder head of an internal combustion engine of a motor vehicle by a fastener in the form of a screw passing through the central bore of the sensor base. A knock sensor is described in particular in document FR 2 821 432 A1.
    It can, for example, be used an M8 screw with application of a tightening torque between 15Nm and 30Nm.
    Many car manufacturers have standardized the tightening torque taking into account a breaking torque of 33Nm. The recommended tightening torque was set at 36 Nm with +/- 2.5Nm for a M8 grade 10.9 screw. A tightening torque of 15Nm +/- 1 Nm has also been set for a M6 grade 10.9 screw.
    However, a M6 screw tightened to 15Nm has a compressive force almost equal to a M8 screw tightened to 20Nm and is therefore well suited for mounting a knock sensor. The current trend is to use to mount the sensor against the housing a M6 grade 10.9 screw in place of an M8 screw. In this case, it is necessary to use a centering spacer to be inserted into the central bore to grip the M6 screw in place of the M8 screw and center it. The use of a M6 grade 10.9 screw to mount the knock sensor with a centering spacer requires in all cases, ie a sensor delivered with or without M6 screws, to assemble it with its spacer during its manufacture and then deliver it assembled.
    This generates significant quality risks related to ensuring the presence of the spacer from the assembly operation through the storage operations, packaging and transport to finish the various manipulations performed by the editor during the mounting the sensor on the motor housing.
    In addition, it is necessary, because of these risks of loss, to set up a quick check of the presence of the spacer, the latter being for example a color for quick visual identification. This generates additional costs in the manufacture of the knock sensor by decreasing only slightly the probability of presence of the fault, that is to say mainly the loss of the centering spacer or its poor positioning.
    The problem underlying the present invention is, for an accelerometer sensor having a base comprising a central bore receiving a centering spacer of a fastening element for securing the accelerometer sensor against a support member, to retain permanently the spacer in position in the central bore of the sensor base before the sensor is secured to the support element without the addition of an auxiliary element for holding the spacer in the central bore. For this purpose, the present invention provides a method of forming a spacer extending at least partially in the length of a central bore passing right through a barrel of a base of an accelerometer sensor, the bore central being adapted to receive a fastening element solidarisant the base against a support member, the fastening element being centered by the spacer in the central bore, the base being surrounded at least partially by a coating of a material overmolded plastic, the process being remarkable in that, during overmolding of the plastic material around the base to form the coating, a portion of the plastic material passes through the barrel to form the spacer making it integral with the coating.
    With this method of forming a spacer in the central bore of a shaft of a base of an accelerometer sensor, the spacer is captive throughout the life of the sensor as integral with the coating being of a alone holding with this coating. This further strengthens the resistance of the coating relative to the base and provides a stronger construction of the sensor, the spacer having a role of maintaining the position of the coating relative to the base by abutment against the wall the central bore of the barrel and vice versa. The flow of plastic material towards the central bore is intended to overmold, in the central bore of the base, a centering spacer integral with the base and being integral with the outer coating of the base. This makes it possible to adapt the central bore of the base of the base to the reception of a smaller fastening element, for example an M6 screw instead of an M8 screw, the fastening element being centered in the bore through the spacer. The addition of chamfers to the shape of the over-molded spacer also limits the insertion forces of the fastener element in the central bore.
    Compared to the closest state of the art with mounting of a removable spacer in the central bore, the mounting and positioning operation of the spacer in the central bore is eliminated. Since the spacer is formed simultaneously with the over-molding of the coating, its formation requires no additional assembly time. In addition, it is no longer necessary to use a polarizer to avoid forgetting the spacer and to provide means for holding the spacer in place in the central bore, this maintenance being ensured by virtue of the solidarity of the spacer with the coating. Spacer presence checks are no longer required. The position of the spacer in the bore is also reinforced. For example for a knock sensor, a standard M6 screw can be mounted in grade 10.9 without the risk of driving the spacer from the central bore.
    Preferably, prior to over-molding of the coating and the integral spacer, a core of similar shape to that of the fastening element is positioned in the central bore of the base barrel, the core having at least one shoulder contacting the wall of the central bore forming, during overmolding, a stop for a longitudinal end of the integral spacer.
    This allows delimiting the plastic filling space defining the spacer, the shoulder limiting the spacer in the length of the bore. The invention also relates to a base for an accelerometer sensor for the implementation of such a method, the casing of the base being pierced with at least one channel having, on the one hand, an inlet end opening to the outside of the barrel on a portion of the barrel intended to be surrounded by the coating and on the other hand, an outlet end opening into the central bore of the barrel. One or more of these channels allow the passage of the plastic material through the barrel. It is therefore sufficient to drill a base shaft of the state of the art at least once from one side of its wall to obtain a base that can implement the method according to the invention, which is limited to a modification simple to perform. The use of one or more channels allows, by appropriate configuration, overmolding tools of the sensor, to ensure the flow of the overmolding plastic material in the central bore of the base barrel, thus materializing a spacer of centering. The spacer may take a form facilitating the insertion of the fastener element into its interior.
    Advantageously, said at least one channel extends substantially perpendicularly to the central bore.
    Advantageously, said at least one channel opens into the central bore near a first longitudinal end of the central bore opposite a second longitudinal end intended to be secured against the support member. This allows a better distribution of plastic material around the inside of the central bore to form the integral spacer.
    Advantageously, the casing of the base comprises several channels whose outlet ends are evenly distributed all around the central bore. The invention relates to an accelerometer sensor comprising a base with a shank having a central bore receiving a fixing element for securing the accelerometer sensor against a support element, the central bore comprising a spacer extending at least partially along the length. of the bore and enclosing the fastener for its centering, a coating of a plastic material being overmolded around an outer wall of the base, the sensor being remarkable in that the base is as described above with at least one channel pierced in the barrel, said at least one channel being filled with the plastic material and the spacer being formed of the plastic material of the coating having passed through said at least one channel, the spacer being thus secured to coating.
    By having a configuration of the spacer integral with the coating of the base of the accelerometer sensor, all risks of loss of the spacer are avoided and this throughout the life of the sensor that can be mounted or assembled against the support element without the risk of losing the spacer. This would not be the case with a removable spacer of the prior art and, for the latter, it should always check its presence and its proper positioning before assembly or reassembly.
    In one embodiment, the fastener, at a first longitudinal end of the central bore, has a head abutting against the barrel and at a second longitudinal end of the bore a threaded portion projecting from the sensor when the head of the fixing element is in outer abutment against the barrel, the threaded portion being intended for the securing of the sensor against a support element.
    In a particularly advantageous embodiment of the present invention, to ensure that the fastening element does not come out of the base of the accelerometer sensor, a portion of the inner fastener element to the central bore carries a ring at its periphery. holding in abutment against one end of the integral spacer and preventing the extraction of the fastening element from the accelerometer sensor prior to securing the fastener element on the support member. The holding ring is protected, since it is inside the base, and is not likely to be removed around the fastener during the various manipulations or storage that the sensor may suffer. provided with its fastening element.
    The present invention also relates to a casing of an internal combustion engine of a motor vehicle, said casing being the support element of such an accelerometer sensor as a knock sensor of the internal combustion engine, the housing having a bore of receiving an end portion of the fastener protruding from the central bore of the barrel of the sensor base to the housing for securing the knock sensor with the housing. Other features, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings given by way of non-limiting examples and in which: FIGS. 1 and 2 are representations schematics perspective views respectively according to the state of the art and according to the invention of an embodiment of an accelerometer sensor base not covered with a coating with a barrel for receiving in a central bore an element of glue type fastening, the base of the base according to the invention shown in Figure 2 being pierced with four channels for securing the coating with a spacer, the accelerometer sensor of this embodiment being of the type glued, - FIG. 3 is a schematic representation of a longitudinal section of a base according to FIG. 2 coated with a plastic coating for a sensor. accelerometer type glued according to an embodiment of the present invention, - Figures 4 and 5 are schematic representations of perspective views respectively according to the state of the art and according to the invention of an embodiment of a sensor base accelerometer not covered with a coating with a barrel for receiving in a central bore a screwed fastener, the barrel of the base according to the invention being pierced with four channels in Figure 5 for securing the l with a spacer, the accelerometer sensor of this embodiment being of the screw type, - Figure 6 is a schematic representation of a longitudinal section of an embodiment of a base of a screw-type type sensor accelerometer according to the present invention, the base being coated with a plastic coating, - Figure 7 is a schematic representation of a longitudinal section of A mold for forming a plastic coating around a portion of the base of an accelerometer sensor according to the present invention, the base being inserted into the mold in this figure.
    In what follows, for an accelerometer sensor, the base designates the median body of the sensor having a shaft and a central bore through which a fastener passes, this without plastic coating and without an element for measuring the acceleration , such as piezoelectric electrodes.
    The words outer or outer barrel or the base qualify a portion of the drum or the base farthest from the central bore through the barrel or this base.
    The accelerometer sensor is understood to include a fastener for attaching the accelerometer sensor to a support member. The spacer may comprise several spacer portions separated from each other or be integral. The length of the spacer is to be taken with reference to the length of the central bore.
    With reference to the figures, the present invention relates to an accelerometer sensor 1, for example but not limited to a knock sensor. Typically, such an accelerometer sensor 1 comprises a base 2 forming the main body of the sensor 1. The base 2 comprises a shaft 2a having a central bore 4 receiving a fastening element 5 for securing the accelerometer sensor 1 against an element of support, for example a crankcase of an internal combustion engine for a knock sensor. It is known to overmold a coating 7 made of a plastic material around an outer wall of the base 2, thus partially surrounding the base 2.
    In addition, it is known that the sensor 1 has piezoelectric members, one end of each member supporting a mass of inertia. The members are housed in a cavity arranged between the coating 7 and the base 2.
    In one embodiment of the piezoelectric members and their housing, the cavity has a sole 13 of support formed by a portion of the outer wall of the barrel 2a projecting radially from the base 2.
    This sole 13 supports a piezoelectric member 14 surrounded by contact rings 16a, 16b serving as electrodes, washers 15a, 15b and a seismic mass 17, all forming a stack, these elements being detailed in FIGS. 3 and 6 but not detailed in Figures 1, 2, 4 and 5.
    To hold this stack, it is possible to stick these elements together in which case the accelerometer sensor 1 is said to be glued or to screw these elements on the base 2, in which case the sensor accelerometer 1 is said screwed. FIGS. 1 and 2 show a base 2 for a glue-type sensor, while FIGS. 4 and 5 show a base 2 for a screw-type sensor, respectively according to the state of the art for FIGS. 1 and 4 and according to FIG. the present invention for Figures 2 and 5.
    The present invention therefore applies both to a glued sensor and to a screwed sensor.
    As can be seen in FIGS. 3 and 7, at least one pin 18 of electrical connection connected to each of the contact rings 16a, 16b passes through the coating 7 towards the outside of the accelerometer sensor 1 by a protective sleeve 19.
    Still in a known manner, as can be seen in FIGS. 3, 6 and 7, the central bore 4 comprises a centering spacer 3, advantageously cylindrical when the bore is cylindrical and covering the entire periphery of at least a portion of the length. 4. The centering spacer 3 extends at least partially over the length of the central bore 4 and encloses the fastening element 5 for its centering in the central bore 4. The element of FIG. fixation 5 is introduced into the central bore 4 to ensure the attachment of the base 2 and thus the accelerometer sensor 1 on a support member. In what follows, the centering spacer 3 will be called more simply spacer or also solidarity spacer, since integral with the coating 7, this to be differentiated from a removable spacer according to the state of the art.
    According to the state of the art, the removable spacer 3 is added manually during assembly by being inserted into the central bore 4 with risk of misalignment of the removable spacer 3 in the central bore 4 or loss of this removable spacer 3 by untimely exit from the central bore 4.
    In a completely opposite approach of the state of the art, in accordance with the problem underlying the present invention, in particular to make captive the spacer 3, there is provided a method of forming a spacer 3 integral extending to least partially along the length of a central bore 4 passing right through a barrel 2a of a base 2 of an accelerometer sensor 1 which uses the overmolding operation of the coating 7 based on a plastic material all around the base 2 to simultaneously form the spacer 3. The spacer 3 is then secured to the coating 7 being integral with the coating 7, that is to say material coming with the coating 7 .
    Thus, during the overmolding of the plastic material around the base 2 to form the coating 7, a portion of the plastic material for overmolding passes through the barrel 2a to form a spacer 3 integral with the coating 7 in the bore central 4 of the drum 2a. During the solidification of the plastic material of the coating 7 and the spacer 3, a firm fastening of the spacer 3 and the coating 7 via the solidified plastic material in the barrel 2a of the base 2 is obtained .
    The plastic used can be diverse. For example, without being limiting, it may be polyamide 66. The polyamide 66 has good hardness, good abrasion resistance and is more resistant to heat and less sensitive to creep. Its resistance remains high over a wide temperature range. This corresponds well to the conditions that will be subjected to a knock sensor secured to a relatively hot casing of internal combustion engine.
    Such a spacer 3 secured may have a cylindrical shape with a free space left free which has a diameter corresponding to that of the fastening element 5. The spacer 3 secured may also be in several spaced portions, each spaced portion being connected to a channel 8 passing through the barrel 2a, channel 8 which will be more precisely described later. The first embodiment is preferred. The spacer 3 integral or each spacer portion may have on its face the innermost to the central bore 4, that is to say vis-a-vis with the fastener 5 a profile for easy insertion of the fixing element 5 in the central bore 4 and consequently in the barrel 2a of the base 2 of the accelerometer sensor 1.
    It is also possible to provide on this most internal face in addition to a profile facilitating insertion facilitated the same profile making it more difficult removal of the fastening element 5 to keep it in place in the case where this element of 5 is mounted in the accelerometer sensor 1 prior to the attachment of the accelerometer sensor 1 on the transport element and handled as such.
    Indeed, it is possible, prior to assembly, to have an accelerometer sensor package 1 with its attachment element 5 already integrated in the sensor accelerometer 1 as having an accelerometer sensor 1 being conditioned without its fastener element 5. The profile making it more difficult to remove the fixing element 5 must not, however, hinder the assembly or disassembly of the accelerometer sensor 1 on or of the support element.
    During this method of forming the spacer 3 integral with the coating 7, it is necessary to limit the amount of plastic passing through the barrel 2a in order to leave a void space inside the spacer 3 which corresponds to the dimensions of the fastening element 5 to be inserted in the central bore 4 for fixing the accelerometer sensor 1 against a support element.
    Referring to Figure 7, to do this, prior to overmoulding of the coating 7 and the spacer 3 secured to a core 6c of similar shape to that of the fastener 5 can be positioned in the bore This elongate core 6c, also called a plunger, may have the same diameter as the fixing element 5 when it is cylindrical, which is frequently the case, or the same width.
    In addition, the core 6c may have at least one shoulder 22 contacting the wall of the central bore 4 forming a stop against which is formed an end of the spacer 3 secured. The shoulder 22 then forms a stop during overmoulding for a longitudinal end 4a of the spacer 3 integral with the coating 7.
    Overmolding of the plastic material can be done in a mold 6 in two parts 6a, 6b. A first portion 6a of the mold 6 envelops the upper part of the base 2, that is to say the one containing the end of the central bore 4 through which the fixing element 5 is intended to be introduced. A second portion 6b of the mold 6 envelops the lower part of the base 2, that is to say the one containing the end of the central bore 4 through which the fastening element 5 leaves the base 2 towards the support element. In Figure 7, it is the second part 6b of the mold 6 which carries the core 6c but it could be both the first part 6a. The first and second parts 6a, 6b of the mold 6 are adjacent to each other and meet at mid-height of the base 2 to form a closed enclosure. A portion of the first portion 6a enters the central bore 4 of the base 2 and is releasably connected to the core 6c by having a form of anchoring complementary to an anchoring form 10 carried by the core 6c screwed -a-vis.
    The first and second parts 6a, 6b of the mold 6 also delimit between them a space for the coating of the protective sleeve 19 housing the pin 18, the protective sleeve 19 being inserted between the two parts 6a, 6b of the mold 6. A molding insert 6d can define the shape of the protective sleeve 19.
    The plastic material having penetrated into the central bore 4 is confined between the shoulder 22 and a portion of the outer wall of the core 6c in order to form a spacer 3 integral with the coating 7 with the desired dimensions and of a suitable configuration. . The core 6c may have other protruding portions in the case of a spacer 3 of more complex shape than a spacer 3 cylindrical, for example portions providing a spacing between several spacer portions 3.
    In order to allow the overmolded plastic material to pass through the base 2 to reach the central bore 4, the barrel 2a of the base 2 is pierced with at least one channel 8, preferably several channels 8 for a better distribution of the plastic material in the central bore 4. In Figures 2 and 5, there is shown four channels 8 through the barrel 2a of the base 2, these channels 8 being arranged two diametrically opposed pairs.
    The channel or channels 8 have, on the one hand, an inlet end 8a opening out of the barrel 2a on a portion of the barrel 2a intended to be surrounded by the coating 7 and, on the other hand, an end 8b outlet opening into the central bore 4 of the barrel 2a. At the end of overmolding of the coating 7 around at least a portion of the outer wall of the base 2, the channel or channels 8 are filled with plastic and the spacer 3 integral with the coating 7 is formed the plastic material of the coating 7 having passed through the channel (s) 8.
    Advantageously, it can be provided several channels 8, preferably three or four but another number of channels 8 can be chosen. These channels 8 can be drilled in the barrel 2a by a piercing pin, in which case an even number of channels 8 is preferred to effect the subsequent drilling of two walls facing the barrel 2a with the same spindle. The embodiment shown in Figures 2 and 5 is favorable to the consecutive drilling of two diametrically opposed channels 8. These channels 8 can also be laser drilled. This is also valid for drilling a single channel 8.
    The channel or channels 8 may extend substantially perpendicularly to the central bore 4 or being slightly inclined with respect to the central bore 4. It is advantageous for the channel (s) 8 to open into the central bore 4 in the vicinity of a first longitudinal end 4a of the central bore 4 opposite a second longitudinal end 4b intended to be secured to the support member. The channels 8 can lead into the central bore 4 at different heights.
    The distribution and homogeneity of the plastic in the spacer 3 secured to be monitored for not having spacer portions 3 which have a lower thickness or localized defects due to a lack of plastic. To do this, in the case where the barrel 2a of the base 2 comprises several channels 8, the outlet ends 8b of these channels 8 opening into the central bore 4 can be evenly distributed all around the central bore 4.
    To promote the anchoring of the coating 7 on the base 2, the outer wall of the base 2 has at least one groove 21, preferably annular, filled with plastic material of the coating 7. The coating 7 and carries pins 20 of overmolded plastic material penetrating into the groove 21. These grooves 21 and lugs 20 are particularly visible in Figures 3 and 6.
    Advantageously, there may be at least one pair of grooves in the upper part of the accelerometer sensor 1, that is to say the furthest part of the support element and at least one pair of grooves 21 in the lower part of the accelerometer sensor 1.
    The grooves in the upper part are carried by the shaft 2a of the base 2 while the grooves 21 in the lower part are by the base 2, preferably below the sole 13 projecting laterally from the base 2. This sole 13 has previously been described as supporting the piezoelectric member 14, surrounded by contact rings 16a, 16b serving as electrodes, the washers 15a, 15 and the seismic mass 17.
    The grooves 21 at the bottom can be carried by the base 2 below the sole 13 formed by a lateral projecting portion of the base 2. The grooves 21 can make all the way around the outer wall of the base 2, the base 2 may have a substantially cylindrical or conical shape.
    The channel or channels 8 may be just below the groove 21 or grooves in the upper part of the base 2. In Figure 6, there is shown a pair of grooves 21 in the upper part of the barrel 2a of the base 2 , the pair of grooves 21 in the upper part being interposed between a head 9 of the fixing element 5 of the accelerometer sensor 1 and the channel 8. This may be valid for another number of grooves than two. In FIG. 3, the groove or grooves in the upper part of the barrel 2a of the base 2 are not visible because they are replaced or masked by channels 8.
    With particular reference to Figure 3, the fastener 5 is preferably in the form of a screw or the like. The fastening element 5, at a first longitudinal end 4a of the central bore 4, has a head 9 in abutment against the outer shaft 2a of the base 2, that is to say protruding from the base 2 being applied against the shaft 2a of the base 2 during the attachment of the accelerometer sensor 1 against its support element. At a second longitudinal end 4b of the central bore 4, the fastening element 5 has a threaded portion 5b protruding from the accelerometer sensor 1 when the head 9 of the fastener 5 abuts the barrel 2a. The threaded portion 5b is intended for the attachment of the sensor 1 against a support member, for example a casing of an internal combustion engine, by being introduced into a corresponding threaded bore of the support member, for example a housing.
    Frequently, it is required that the accelerometer sensors 1 are delivered with their fastening element 5 already positioned inside the central bore 4 of the drum 2a of the base 2. As a result, this creates the obligation to maintain the fixing element 5 in the sensor 1 until the fixing of the sensor 1 against the support element by means of the fixing element 5.
    Thus, it has been proposed according to the state of the art to place an elastic ring on the threaded portion 5b of a screw as fastening element 5 coming out of the central bore 4. Another proposal was to inject the foam in the central bore 4 to hold the fastener 5 or to inject foam on the thread of the fastener 5 to lock it in position.
    In a different way, the present invention proposes, in an optional embodiment, to make a ring 11, which abuts against one end of the central bore 4, bear on the periphery of a part of the fastening element 5 internal to the central bore 4. spacer 3 secured. The retaining ring 11 is therefore internal to the central bore 4 and prevents the extraction of the fastening element 5 from the accelerometer sensor 1 before the fixation of the fastening element 5 against the support element.
    A particularly interesting application of the invention is for a knock sensor as an accelerometer sensor 1 fixed against a casing of a motor vehicle internal combustion engine as a support element of the knock sensor of the internal combustion engine. .
    The casing then has a bore for receiving an end portion 5b of the fastening element 5 projecting from the central bore 4 of the barrel 2a of the base 2 of the sensor 1 towards the casing for securing the sensor rattling with the crankcase.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. A method of forming a spacer (3) extending at least partially in the length of a central bore (4) passing right through a barrel (2a) of a base (2) of a sensor accelerometer (1), the central bore (4) being intended to receive a fastening element (5) solidarisant the base (2) against a support element, the fastening element (5) being centered by the spacer (3) in the central bore (4), the base (2) being surrounded at least partially by a coating (7) of an overmoulded plastic, characterized in that, during overmoulding of the plastic material around the base (2) to form the coating (7), a portion of the plastic material passes through the barrel (2a) to form the spacer (3) making it integral with the coating (7).
    [2" id="c-fr-0002]
    2. Method according to the preceding claim, characterized in that, prior to overmoulding of the coating (7) and the spacer (3) integral, a core (6c) of a shape similar to that of the fastening element ( 5) is positioned in the central bore (4) of the shank (2a) of the base (2), the core (6c) having at least one shoulder (22) contacting the wall of the central bore (4) in forming a stop, during overmolding, for a longitudinal end (4a) of the spacer (3) integral.
    [3" id="c-fr-0003]
    3. Base (2) for an accelerometer sensor (1) for carrying out the method according to claim 1 or 2, characterized in that the shaft (2a) of the base (2) is pierced with at least one channel (8) having, on the one hand, an inlet end (8a) opening out of the shank (2a) on a portion of the shank (2a) intended to be surrounded by a coating (7) and, d on the other hand, an outlet end (8b) opening into the central bore (4) of the barrel (2a).
    [4" id="c-fr-0004]
    4. Base (2) according to the preceding claim, characterized in that said at least one channel (8) extends substantially perpendicular to the central bore (4).
    [5" id="c-fr-0005]
    5. Base (2) according to one of claims 3 or 4, characterized in that said at least one channel (8) opens into the central bore (4) near a first longitudinal end (4a) of the central bore (4) opposite a second longitudinal end (4b) intended to be applied against the support element.
    [6" id="c-fr-0006]
    6. Base (2) according to any one of claims 3 to 5, characterized in that the shaft (2a) of the base (2) comprises a plurality of channels (8) whose output ends (8b) are distributed regularly all around the central bore (4).
    [7" id="c-fr-0007]
    7. Accelerometer sensor (1) comprising a base (2) with a shank (2a) having a central bore (4) receiving a fastening element (5) for securing the accelerometer sensor (1) against a support member, central bore (4) comprising a spacer (3) extending at least partially along the length of the central bore (4) and enclosing the fastening element (5) for centering it in the central bore (4) , a coating (7) made of a plastic material being overmolded around an outer wall of the base (2), characterized in that the base (2) is according to any one of claims 3 to 6 with at least a channel (8) drilled in the barrel (2a), said at least one channel (8) being filled with the plastic material and the spacer (3) being formed of the plastic material of the coating (7) having passed through said at least one channel (8), the spacer (3) thus being secured to the coating (7).
    [8" id="c-fr-0008]
    8. Accelerometer sensor (1) according to the preceding claim, characterized in that the fastening element (5) at a first longitudinal end (4a) of the central bore (4) has a head (9) in abutment. against the shaft (2a) and, at a second longitudinal end of the central bore (4), a threaded portion (5b) protruding from the sensor (1) when the head (9) of the fastening element (5) ) is in outer abutment against the shaft (2a), the threaded portion (5b) being intended for the attachment of the sensor (1) against a support element.
    [9" id="c-fr-0009]
    9. accelerometer sensor (1) according to one of claims 7 or 8, characterized in that a portion of the fastening element (5) internal to the central bore (4) carries at its periphery a ring (11). in abutment against one end of the spacer (3) integral and preventing the extraction of the fastening element (5) from the accelerometer sensor (1) prior to the securing of the fastening element (5) on the support element.
    [10" id="c-fr-0010]
    10. Carter of an internal combustion engine of a motor vehicle, characterized in that it is the support element of an accelerometer sensor (1) according to any one of claims 7 to 9, the accelerometer sensor (1). ) being a knock sensor of the internal combustion engine, the housing having a bore for receiving an end portion (5b) of the fastener (5) projecting from the central bore (4) of the barrel (2a) of the base (2) of the sensor (1) to the housing for the connection of the sensor (1) rattling with the housing.
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    同族专利:
    公开号 | 公开日
    US10132822B2|2018-11-20|
    CN107085120A|2017-08-22|
    US20170242049A1|2017-08-24|
    CN107085120B|2020-05-19|
    FR3047801B1|2018-02-16|
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    法律状态:
    2017-02-17| PLFP| Fee payment|Year of fee payment: 2 |
    2017-08-18| PLSC| Publication of the preliminary search report|Effective date: 20170818 |
    2018-02-23| PLFP| Fee payment|Year of fee payment: 3 |
    2020-02-19| PLFP| Fee payment|Year of fee payment: 5 |
    2021-02-24| PLFP| Fee payment|Year of fee payment: 6 |
    2021-04-16| TP| Transmission of property|Owner name: CONTINENTAL AUTOMOTIVE FRANCE, FR Effective date: 20210309 Owner name: CONTINENTAL AUTOMOTIVE GMBH, DE Effective date: 20210309 |
    2022-02-11| CA| Change of address|Effective date: 20220103 |
    2022-02-16| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1651130|2016-02-12|
    FR1651130A|FR3047801B1|2016-02-12|2016-02-12|METHOD FOR FORMING AN IMPERDABLE SPACER LOCATED IN AN ACCELEROMETER SENSOR BASE AND SENSOR PROVIDED WITH SUCH A BASE|FR1651130A| FR3047801B1|2016-02-12|2016-02-12|METHOD FOR FORMING AN IMPERDABLE SPACER LOCATED IN AN ACCELEROMETER SENSOR BASE AND SENSOR PROVIDED WITH SUCH A BASE|
    CN201710073762.8A| CN107085120B|2016-02-12|2017-02-10|Method for forming an anti-disengagement spacer housed in a mounting base of an accelerometer sensor and sensor equipped with such a mounting base|
    US15/449,197| US10132822B2|2016-02-12|2017-03-03|Method for forming a captive spacer housed in a mounting base of an accelerometer sensor and sensor equipped with such a mounting base|
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