• 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:
    A method of assembling a sensor means (10) on a housing (20), wherein the sensor means (10) is provided with a body (11) having a protuberance (12), and an electrical cable of electrical connection (15), and the housing (20) is provided with a blind hole (21) whose shape allows the protuberance (18) of the sensor means (10) to engage therewith. The assembly method comprises the steps of: a) inserting the protuberance (12) in the blind hole (21) of the housing (20) by bringing the end wall (14) of the protrusion (12) into contact with a lower wall (22) of the blind hole (21), b) tightening a sleeve (31) to a first torque value, said sleeve having an external thread (32) engaging on an internal thread ( 23) of the blind hole (21) and an internal thread (33) into which an external thread (13) of the protuberance (12) engages, in which the threads (13, 23, 32, 33) all have the same not, c) tightening a clamping means (34) to a second torque value.
    公开号:FR3047051A1
    申请号:FR1750453
    申请日:2017-01-20
    公开日:2017-07-28
    发明作者:Fabrizio Sozzi
    申请人:SKF AB；
    IPC主号:
    专利说明:

    Method and device for assembling a temperature sensor
    DESCRIPTION
    Technical field of the invention
    The present invention relates to a method and a device for installing a sensor means, in particular a temperature sensor.
    The present invention describes a particular application of a temperature sensor, without being limited thereto. Said application relates to the railway transport sector and more particularly to the reading and associated monitoring of the temperature in the vicinity of a roller bearing of an axle of a railway vehicle.
    Although particularly suitable for use in the railway field, the present invention may nevertheless be applied to any other related technical sector such as, for example (without limitation), the industrial sector or the off-road sector. In all the applications mentioned, the invention can be used both if the inner ring of the bearing is rotatable while the outer ring of the bearing is fixed, or vice versa. In addition, the invention can be used for any type of known rolling elements (balls, rollers, conical rollers, etc.).
    Prior art
    It is well known, particularly in the railway vehicle sector, that roller bearings intended for railway vehicle axles are subject to severe constraints. More particularly, the bearings used on railway axles are generally in pairs and are interposed between the suspension and the wheel of the vehicle. The bearing is supported in a housing, or "axle box", and the stress transmitted by the suspension creates a significant increase in temperature during operation. This temperature should be continuously monitored as excessive temperature measurement indicates a malfunction of the system. More precisely, three alarm thresholds are used: a first alarm threshold is reached when a predetermined absolute temperature value is exceeded, a second alarm threshold is reached when the difference between the temperature of the bearing and the temperature of the the external environment exceeds another predetermined value, and finally, a third alarm threshold is reached when a predetermined temperature difference between the two bearings of the same rail axle is exceeded.
    This requirement reveals a well-defined need to continuously monitor the bearing temperature to determine the temperature at a point near the area of each bearing subjected to the highest stresses.
    The temperature is monitored by means of a temperature sensor for each bearing, which sensor is electrically connected to a control unit using the temperature values read by the sensors to manage the activation of the alarms related to the above-mentioned temperature thresholds. when they are out of date.
    The temperature sensor is provided with a temperature sensitive element inserted in the housing containing the bearing and reads the temperature of said housing near the point of the bearing which is subjected to the strongest stress.
    It is necessary that the sensor is stably attached to the housing, that its electrical cable does not rotate during assembly and that it is hermetically sealed in an appropriate manner. Failure to comply with these conditions produces an obvious adverse effect on the transmission of temperature signals.
    Meeting these requirements complicates the assembly of the temperature sensor, as this requires very precise tolerances and, in any case, a rather long and tedious assembly process. There are in particular two known solutions to ensure that the temperature sensor is in stable contact with the surface whose temperature measurement must be performed.
    A first solution is to provide the sensor with a protuberance having a diameter, and more particularly a very precise length, and to provide the housing with an orifice of dimension just as precise, so as to ensure a good connection with the protuberance of the sensor. The sensor can be attached to the housing by means of a suitable flange and fixing screws. This means that the housing is designed to have at least three orifices, one of which has a high accuracy.
    To avoid these constraining machining tolerances, a second known solution is to screw the sensor into the hole in the housing. Both components can thus be provided with a thread without restrictive tolerance. However, the disadvantage of this solution is that the sensor cable can not be assembled on the latter, or integrated in the sensor, and that it must be connected to the sensor after the assembly operation in order to prevent the cable from rotating during assembly. This requires the use of additional electrical connectors for subsequent connection of the cable to the temperature sensor. SUMMARY OF THE INVENTION One of the objects of the present invention is to provide a method of assembling a sensor means on a housing, in particular a temperature sensor on an axle box of an axle. train, which makes it possible to remedy in a simple and inexpensive way the technical problems described above. The invention relates to a method for assembling a sensor means on a housing of the invention in which: - the sensor means is provided with a body having a protuberance, and a connected electrical connection cable of permanently to the body; and the housing is provided with a blind hole configured so that the protrusion of the sensor means engages therein.
    According to the invention, the method of assembling the sensor means on the housing comprises the following steps: a) inserting the protuberance into the blind hole of the housing by bringing an end wall of the protuberance into contact with a bottom wall of the blind hole, b) screwing to a first torque value a socket of an assembly device of the sensor means on the housing, the socket having an external thread engaging on an internal thread. the blind hole of the housing and an internal thread in which engages an external thread of the protrusion of the sensor means, all the threads having the same pitch, and c) screwing a clamping means of the mounting device to a second torque value.
    By performing the steps of the method according to the invention, sensor means whose electrical cable is already connected are used. The sensor means can be screwed into the housing without excessively constraining machining tolerances necessary and without rotating the electrical cable during assembly.
    According to a particularly advantageous embodiment of the assembly method, the sleeve (31) is not screwed into the internal thread (23) of the housing (20) during step a).
    According to another embodiment of the assembly method, the contact between the end wall (14) of the protuberance (12) and the bottom wall (22) of the blind hole (21) at the end of the step b), is provided by clamping the sensor means (10) by means of a hexagonal head (16) of the body (11) of the sensor means (10).
    According to another aspect, the invention also relates to an assembly device for use in the method of assembling a sensor means on a housing as described above, the assembly device comprising: a socket having an external thread engaging an internal thread of a blind hole of the housing and an internal thread engaging an external thread of a protuberance of the sensor means (10), wherein all the threads have the same not, and - a clamping means.
    According to one embodiment of the assembly device, said pitch of the threads is exactly equal to 1.5 mm.
    It is also advantageous that said clamping means is a hexagonal nut.
    According to another aspect, the invention also relates to a sensor means comprising a body, having a protrusion and an electrical connection cable permanently connected to the body, suitable for the method of assembly on a housing according to the invention.
    Advantageously, the sensor means is a temperature sensor intended for applications on rail vehicle axle roller bearings.
    Brief description of the drawings
    Some preferred non-limiting embodiments of the invention are described below with reference to the accompanying drawings, in which: - Figure 1 is a partial axial cross-section showing the temperature sensor, the housing, and the assembly device for the temperature sensor during a first phase of the method of assembling the temperature sensor on the housing, according to a preferred embodiment of the invention, Figure 2 shows the same partial axial cross section as that of FIG. 1, illustrating a second phase of the assembly process, FIGS. 3a and 3b show a possible subsequent phase of the assembly process from the preceding figures; FIG. 4 represents a final phase of the same assembly method.
    detailed description
    The method of assembling a sensor means 10 on a housing 20 is described below with reference to the figures, and more particularly to FIG.
    It is preferred that the sensor means 10 be a temperature sensor for use on the axle roller bearing on railway vehicles. The temperature sensor is used to monitor the temperature near the area of the bearing that is subjected to the greatest stress, by transmitting the read data to a control unit (of a known type, which is therefore not represented in the appended figures). The control unit manages this data and activates the appropriate alarms if the temperature read is above certain thresholds, as described in the introduction to this description. However, it is not necessary that the sensor means be a temperature sensor, it can also be used for other applications in the railway field.
    The sensor means 10 is provided with a body 11 having a protuberance 11 which contains the temperature sensitive element. The protuberance 12 has an external thread 13 used for assembly (as described hereinafter) and an end wall 14 adapted to engage the surface of the housing for which the temperature is to be measured.
    The sensor means 10 also includes an electrical cable 15 for connection to the control unit. The electrical cable 15 is stably connected to the body 11 to avoid the need to use additional electrical connectors between the sensor and the cable, thus ensuring the continuity of the electrical signal.
    The housing 20, shown diagrammatically in the figures as having a prismatic shape but can of course have any shape, is preferably the aforesaid axle box, or the housing containing the bearing of the railway axle. The housing is provided with a blind hole 21 whose shape allows the protrusion 12 of the sensor means 10 to engage therewith. In particular, the blind hole 21 has an internal thread 23 used for assembly (as described hereinafter) and a bottom wall 22 which comes into contact with the sensor element of the sensor or the end wall 14 thereof. latest.
    Figure 1 also shows the assembly device 30 for carrying out the assembly method of the present invention. The device is mainly formed of a sleeve 31 and a clamping means 34, such as a conventional hexagonal clamping nut. Bushing 31 is a hollow threaded bushing which is coaxial with the temperature sensor (or with the generic sensor means). The bushing has an external thread 32 which engages on the internal thread 23 of the blind hole 21 in the casing 20 and an internal thread 33 in which the external thread 13 of the protuberance 12 of the sensor means 10 engages.
    A fundamental feature of the device is that the external thread 32 and the internal thread 33 of the sleeve 31 have the same pitch. Therefore, the external thread 13 of the protrusion of the sensor and the internal thread 23 of the blind hole 21 formed in the housing 20 also have the same pitch. In other words, the threads 13, 23, 32, 33 all have the same pitch. It is preferable that the common pitch of the threads can be the standard standard value of 1.5 mm. The bushing 31 therefore comprises two coaxial threads, the external thread being used to stably fix the bushing to the housing and the internal thread being used to keep the sensor means in the correct position. As has been demonstrated, the fact that the two threads of the sleeve have the same pitch allows the protrusion 12 of the sensor means to be maintained at the correct axial position when the socket is screwed into the housing, without doing so. turn the latter and therefore without rotating the electrical cable 15 used for connection to the control unit.
    The method of assembling sensor means is described below with reference to FIGS. 1 to 4, and more particularly as indicated below: FIG. 1 represents a first phase (a) during which the sensor means is assembled on the housing, involving the insertion (can be manual) of the protrusion 12 in the orifice 21 formed in the housing 20, bringing the end wall 14 of the protrusion 12 into contact with the lower wall 22 of the blind hole 21. During this phase of the method, the sleeve 31 is held static, that is to say, it is not screwed into the internal thread 23 of the housing 20. - Figure 2 represents the next phase (b) the method, which consists in screwing the sleeve 31 on the housing 20 to a first torque value, that is to say by bringing an end wall 35 of the sleeve 31 into contact with an end wall 24 of the housing 20. The fact that the external thread No. 32 and the internal thread 33 of the sleeve have the same pitch allows to ensure that the sensor means 10 are maintained at the correct axial position without rotation, and therefore without rotating the electrical cable 15 used for connection to the control unit. - Preferably, at the end of this phase, the end wall 14 of the protuberance 12 is brought into contact with the bottom wall 22 of the blind hole 21 by a slight rotation of the sensor means 10 with the aid of a hexagonal head 16 of the body 11, as shown in Figures 3a and 3b.
    Finally, the last phase (c) of the assembly method shown in FIG. 4 consists in tightening clamping means 34, such as the hexagonal nut of the assembly device 30, to a second value of tightening torque. , bringing it into contact with the sleeve 31.
    The advantages of the assembly method described above and the associated device appear clearly. In the first place, the present method avoids the need for any machining of the components (sensor means and housing) requiring precision tolerances. In addition, the sensor can be assembled with the electrical cable for connection to the already fixed control unit. Indeed, the use of the sleeve having internal and external threads having the same pitch makes it possible to tighten the sensor on the housing without causing any microscopic rotation thereof. The potential microrotations of the sensor pose no problem with respect to the electrical cable and can be corrected later by acting on the hexagon of the sensor body. Finally, the assembly method is simple and its implementation is fast, and requires an assembly device that is also simple to perform. Finally, the process is also advantageous from an economic point of view.
    In addition to the embodiments described above, many other variants of the invention are conceivable. Said embodiments are offered as non-limiting examples of the invention, its applications or its possible configurations. Indeed, although the description presented above allows the skilled person to implement the present invention at least in accordance with an exemplary configuration of the latter, many variants of the described components could be used without the it deviates from the scope of the invention as described in the appended claims interpreted literally and / or in accordance with their legal equivalents.
    权利要求:
    Claims (8)
    [1" id="c-fr-0001]
    claims
    A method of assembling a sensor means (10) on a housing (20), wherein - the sensor means (10) is provided with a body (11) having a protuberance (12), and an electrical connection cable (15) permanently connected to the body (11); the housing (20) is provided with a blind hole (21) configured so that the protuberance (18) of the sensor means (10) engages therein, the assembly method being characterized by the steps of to: a) inserting the protuberance (12) in the blind hole (21) of the housing (20) by bringing an end wall (14) of the protuberance (12) into contact with a bottom wall (22) of the blind hole (21), b) screwing a sleeve (31) of a connecting device (30) of the sensor means (10) to the housing (20) to a first torque value (31), the sleeve (31) ) having an external thread (32) engaging an internal thread (23) of the blind hole (21) of the housing (20) and an internal thread (33) into which an external thread (13) of the protrusion engages (12) of the sensor means (10), all the threads (13, 23, 32, 33) having the same pitch, c) screwing a clamping means (34) of the mounting device (30) to a second value tightening torque.
    [2" id="c-fr-0002]
    2. Assembly method according to claim 1, characterized in that, in step a), the sleeve (31) is not screwed into the internal thread (23) of the housing (20).
    [3" id="c-fr-0003]
    3. Assembly method according to claim 1 or 2, characterized in that at the end of step b), the contact between the end wall (14) of the protuberance (12) and the bottom wall ( 22) of the blind hole (21) is provided by clamping the sensor means (10) by means of a hexagonal head (16) of the body (11) of the sensor means (10).
    [4" id="c-fr-0004]
    An assembly device (30) for use in a method of assembling a sensor means (10) to a housing (20) according to any one of the preceding claims, the assembly device comprising: - a bushing (31) having an external thread (32) engaging on an internal thread (23) of a blind hole (21) of the housing (20) and an internal thread (33) in which threads engage external device (13) of a protuberance (12) of the sensor means (10), in which all the threads (13, 23, 32, 33) have the same pitch, - a clamping means (34).
    [5" id="c-fr-0005]
    5. An assembly device (30) according to claim 4, wherein said thread pitch (13, 23, 32, 33) is exactly equal to 1.5 mm.
    [6" id="c-fr-0006]
    An assembly device (30) according to claim 4 or 5, wherein said clamping means (34) is a hexagonal nut.
    [7" id="c-fr-0007]
    A sensor means (10) comprising a body (11), having a protrusion (12) and an electrical connection cable (15) permanently connected to the body (11), suitable for a method of assembly on a housing (20), the assembly method being according to any one of claims 1 to 3.
    [8" id="c-fr-0008]
    A sensor means (10) as claimed in claim 7, which is a temperature sensor for applications on railway vehicle axle roller bearings.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CN107024292A|2017-08-08|
    CN107024292B|2020-09-11|
    US20170211989A1|2017-07-27|
    US10697835B2|2020-06-30|
    DE102017200751A1|2017-07-27|
    FR3047051B1|2020-01-31|
    ITUB20160129A1|2017-07-21|
    引用文献:
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    法律状态:
    2018-01-29| PLFP| Fee payment|Year of fee payment: 2 |
    2019-01-30| PLFP| Fee payment|Year of fee payment: 3 |
    2020-01-28| PLFP| Fee payment|Year of fee payment: 4 |
    2021-01-27| PLFP| Fee payment|Year of fee payment: 5 |
    2022-01-26| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    IT102016000005727|2016-01-21|
    ITUB2016A000129A|ITUB20160129A1|2016-01-21|2016-01-21|Procedure and mounting device of a temperature sensor.|
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