• 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 invention relates to a wheel (1) for watchmakers, intended to cooperate frictionally with a shaft of radius R1. The wheel (1) comprises a hub (8), a portion (16), movable by elastic deformation, is located inside the hub (8) in a rest position and is arranged in contact with the shaft in a service position, such that the wheel (1) is integral with the shaft, when the torque to be transmitted has a value less than a predefined value, and that the wheel (1) has a relative rotation with respect to the when the torque to be transmitted exceeds the predefined value. The inner periphery (10) of the hub (8) has the general shape of a ring of radius R2, slightly greater than R1, and comprises at least two additional contact regions arranged in an extra thickness, at a distance from the center substantially less than or equal to to R1, to cooperate with the shaft. The invention further relates to a mobile, a movement and a timepiece provided with such a wheel.
    公开号:CH710467A1
    申请号:CH01927/14
    申请日:2014-12-12
    公开日:2016-06-15
    发明作者:Jolion Vincent；Jose Vides De Oliveira Mario
    申请人:Richemont Int Sa；
    IPC主号:
    专利说明:

    Technical area
    The present invention relates to a wheel for a watch mechanism, intended to cooperate with a shaft of radius R1 by a friction type connection, the wheel having a hub, whose inner periphery is intended to cooperate with the shaft and, having at least one movable portion, by elastic deformation, comprising a first contact region located at least partially inside the inner periphery of the hub in a rest position, that is to say in the absence of the shaft, and intended to be arranged in contact with the shaft in a service position.
    State of the art
    [0002] Friction mobiles are well known in the field of watchmaking. A typical example of such a mobile is the roadway, in the time display train, which may include friction to allow the setting time of a timepiece.
    However, a difficulty recognized in the implementation of these mobiles lies in the accuracy of their realization, in particular in the adjustment of the predefined value of the torque occurring between the two frictionally coupled members beyond which they have a relative rotation, known as friction torque.
    For example, the patent CH 701 075 B1, issued in 2010 in the name of the Applicant, describes a technical solution to ensure a better accuracy in the adjustment of this preset value of torque. For this purpose, this patent proposes to construct a frictional wheel having a wheel cooperating by friction with a shaft arranged at its center, through a hub. A plurality of rigid arms provides the connection between the hub and a serge of the mobile. Furthermore, the hub has the general shape of a ring extending over less than one full turn to define an opening. An additional arm, elastically deformable, is integral with the serge and extends towards the opening of the hub to engage its free end. A pad is formed on the latter, the latter being movable, by deformation of the additional arm which carries it, between a rest position, that is to say in the absence of the shaft, in which it is at less partially located in the central hole of the hub, and a service position, when the shaft is in place in the center of the wheel, in which it is arranged in contact with the shaft. In the operating position, the shoe exerts a force on the shaft such that the wheel and the shaft are secured to each other in rotation as long as the torque to be transmitted between them has a value lower than a predefined value . When the torque to be transmitted between the wheel and the shaft has a value greater than this preset value, the force exerted by the shoe on the shaft is no longer sufficient to maintain the latter secured to the wheel and a relative rotational movement occurs between them.
    Thanks to these structural features, the manufacture of the corresponding mobile can be carried out in a simple manner, while ensuring a high accuracy as to the predefined value of the torque to be transmitted between the shaft and the wheel beyond which these two bodies have a relative rotation.
    Disclosure of the invention
    A main object of the present invention is to provide an improvement of the construction of a friction mobile of the type just described, with few modifications with reference to known constructions but increased accuracy and reliability.
    For this purpose, the present invention relates more particularly to a wheel of the type mentioned above, characterized in that the inner periphery of the hub has the general shape of a ring of radius R2, slightly greater than the radius R1 of the shaft, intended to cooperate with the wheel, and comprises at least first and second additional contact regions arranged in extra thickness inside the ring, at a distance from the center of the ring substantially less than or equal to R1, to be likely to cooperate with the tree.
    With these features, it is sufficient to ensure high accuracy in the manufacture of the contact regions while, for the realization of the mobile of the state of the art mentioned above, the entire inner periphery of the hub and the entire pad must be made with the utmost precision.
    Indeed, the slightest defect in the manufacture of the hub or the pad, in this mobile of the prior art, can affect the accuracy of centering of the shaft with reference to the serge of the wheel, which could cause problems in some applications. In a different manner, precise positioning and dimensioning of the three contact regions during manufacture of the wheel according to the present invention is sufficient to guarantee excellent centering accuracy of the shaft in the wheel.
    Advantageously, the inner periphery of the hub comprises at least a third additional contact region arranged relative to one of the other contact regions in such a way that they define between them a concavity intended to fulfill the function of a lubricant reservoir.
    Thus, it is possible to place lubricant in the reservoir, during assembly of the corresponding friction mobile or during a subsequent service of the corresponding watch movement, to ensure that the slip that occurs between the wheel and the The shaft of the frictional mobile takes place with a minimum of friction, when the value of the torque to be transmitted between these two members exceeds the predefined value.
    According to a preferred non-limiting embodiment, the concavity and the contact regions that define it are arranged on the movable portion.
    According to additional preferred features, at least two other contact regions are arranged relative to one another so as to define between them an additional concavity intended to fulfill the function of an additional lubricant reservoir.
    According to a preferred embodiment of the invention, when the wheel comprises a serge and at least two rigid arms arranged to make the serge and the hub integral with each other, the movable portion is carried by a elastically deformable arm, integral with the serge, such that it is movable in a substantially radial direction to move the first contact region from the home position to the service position and vice versa.
    According to a preferred embodiment, the deformable arm can be made integral with the serge by means of one of the rigid arms, preferably via two rigid arms, the deformable arm advantageously in this case a shape symmetrical with respect to a median of the two rigid arms which carry it.
    According to a further preferred embodiment, the hub may have an opening defining a passage for a head of the deformable arm carrying the contact regions at its free end, the opening being shaped so as to define at least one stop, for the head, located at a distance from the center of the ring substantially greater than that associated with the service position.
    Alternatively or in addition, the wheel may comprise at least one stop, integral with the serge and arranged to limit at least partially the deformation of the deformable arm when the movable portion moves away from the center of the ring until to reach a predefined distance greater than that associated with the service position.
    The present invention also relates to a friction wheel for a clock mechanism comprising a wheel, having the characteristics that have just been exposed, associated with a shaft having at least a portion of substantially cylindrical shape housed in the hub of the wheel, and a watch movement comprising such a friction wheel and a timepiece provided with such a watch movement.
    Brief description of the drawings
    Other features and advantages of the present invention will appear more clearly on reading the detailed description of a preferred embodiment which follows, made with reference to the accompanying drawings given by way of non-limiting examples and in which :<tb> Fig. 1 <SEP> represents a simplified front view of a friction wheel according to a preferred embodiment of the invention;<tb> fig. 2 <SEP> represents a simplified perspective view of the wheel of FIG. 1 when it cooperates with a shaft to form a friction mobile, and<tb> fig. 3 <SEP> represents an enlarged top view of a constructional detail of the friction wheel of FIG. 2.
    Mode (s) of realization of the invention
    FIG. 1 is a simplified front view of a friction wheel 1 according to a preferred embodiment of the present invention.
    By way of nonlimiting illustration, the wheel 1 comprises a serge 2 provided with a toothing 4. Six rigid arms 6 extend radially from the serge 2 towards the center of the wheel 1 and are integral with a hub 8 , of generally annular shape with an inner periphery 10 of average radius R2, slightly greater than the radius R1 of a shaft with which the wheel is intended to cooperate (the shaft being visible in FIG 2). The hub 8 extends over less than one full turn, to define an opening 12 whose function will be explained later.
    Of course, the skilled person can adapt the number and shape of the rigid arms 6 according to his own needs without departing from the scope of the present invention.
    An additional arm 14, elastically deformable, is arranged between two rigid arms 6. The deformable arm 14 has substantially a double S shape, one of which is inverted, preferably having a symmetry with reference to the median M of the two rigid arms 6 who wear it.
    The junction between the two S drawn by the deformable arm 14, located at the median M, comprises a head 16 extending substantially radially toward the center of the wheel 1.
    The head 16 is positioned through the opening 12 of the hub 8, so that its free end is located substantially in the continuity of the inner periphery 10 of the hub 8, to complete it.
    With this characteristic, there is obtained a friction wheel whose wheel comprises a hub whose inner periphery has a movable portion by elastic deformation, while being almost continuous over 360 degrees.
    Advantageously, the opening 12 is slightly wider in the inner region of the hub than in its outer region, while the head 16 has a shape substantially complementary to that of the opening 12. the opening 12 define stops on either side of the head 16 when the latter moves towards the outside of the wheel 1 beyond a predefined distance greater than a distance associated with a service position as will be apparent from the remainder of this presentation.
    Furthermore, two additional rigid arms 18, not connected to the hub but integral with the serge 2, are arranged opposite the deformable arm 14. More specifically, each arm 18 has its free end 20 which is located near the base of one of the S formed by the deformable arm 14, so as to define an additional stop in case of significant deformation of the arm 14.
    It will be noted that all of the rigid arms 6 and 18 substantially represents a form of Maltese cross, for aesthetic reasons and for illustrative purposes, the invention is not limited to such a representation.
    FIG. 2 represents a simplified perspective view of the wheel 1, when a shaft 30 is housed inside the hub 8 to form a friction mobile.
    It appears from FIG. 2 that the shaft 30 is mainly centered in the hub 8 by the inner periphery 10 of the latter since it extends over more than three quarters of a turn.
    The deformable arm 14 is shaped and dimensioned such that the head 16 exerts a predetermined pressure on the shaft 30. As long as the torque to be transmitted between the shaft 30 and the wheel 1 has a value less than a value predefined (corresponding to the friction torque), this pressure keeps these two members integral with each other in rotation. When the torque to be transmitted has a value greater than the predefined value, that is to say when it becomes larger than the friction torque, a slip occurs between the wheel 1 and the shaft 30 which then have a relative rotational movement.
    FIG. 3 represents a simplified front view of an enlargement of the center of the wheel 1, the shaft 30 being in place in the hub 8.
    It appears from FIG. 3 that the inner periphery 10 of the hub 8 has a mean radius R2 substantially greater than the radius R1 of the shaft 30, as mentioned above.
    The inner periphery 10 has two bosses 32, arranged in extra thickness inside the inner periphery and located at a distance from the center of the wheel 1 substantially equal to the radius R1, so as to define regions of contact with the tree 30.
    The inner periphery of the hub 8, considered in its broad sense, that is to say by including the head 16 of the deformable arm 14, comprises two additional contact regions 34 formed on the free end of the head 16. Thus, the deformable arm 14 is shaped and dimensioned such that the additional contact regions 34 cooperate with the shaft 30 to maintain it in the center of the wheel 1, in collaboration with the contact regions 32. For this purpose, the additional contact regions 34 are located at a distance from the center of the wheel substantially less than or equal to R1 when the deformable arm 14 is in its state of rest, that is to say when it is not stressed.
    When the shaft 30 is inserted into the hub 8, the deformable arm 14 is deformed under the effect of the contact of the shaft 30 with the head 16 which is pushed towards the outside, to pass from his rest position at its service position, in which it is arranged in support against the shaft. The deformable arm 14 thus plays the role of a spring which is armed during assembly of the mobile to give rise to the friction force.
    Note that the stops defined by the walls of the opening 12 and the free ends 20 of the rigid arms 18 allow in particular to avoid causing damage to the deformable arm 14 when the wheel 1 and the shaft 30 are assembled to each other.
    In general, it is noted that three contact regions are sufficient to ensure proper centering of the shaft 30 in the wheel 1.
    However, it appears from FIG. 3 illustrating a preferred embodiment of the present invention that four contact regions are provided in all, to the extent that the head 16 of the deformable arm 14 carries two.
    More specifically, the two additional contact regions 34 are arranged relative to each other in such a way that they define between them a concavity intended to fulfill the function of a lubricant reservoir once. the shaft 30 housed in the wheel 1.
    This concavity has reduced dimensions and ensures the storage of a small amount of lubricant by capillarity, in order to ensure lubrication of the connection between the wheel and the shaft when a slip occurs between them.
    Similarly, the two contact regions 32 are also arranged relative to each other in such a way that they define between them a concavity intended to fulfill the function of an additional lubricant reservoir. when the shaft 30 is housed in the wheel 1.
    The lubricant has been shown schematically in FIG. 3, by black areas 36 extending slightly on either side of each of the corresponding concavities.
    Of course, the skilled person can easily adapt the number of contact regions, as well as the number of lubricant tanks, according to its own needs, without departing from the scope of the present invention. Indeed, it is possible in particular to provide that the head 16 of the deformable arm 14 carries only one additional contact region 34 while the inner periphery 10 of the hub 8 comprises at least two contact regions 32, possibly defining between them a unique lubricant reservoir.
    With the construction that has just been described, there is obtained a wheel for mobile friction, and a mobile friction corresponding, whose manufacture and assembly are simple, while having reliable and accurate mechanical properties. In addition, depending on the location of the contact regions relative to each other, it is possible to provide that they define at least one lubricant reservoir for receiving lubricant to improve the relative sliding quality between the wheel and the shaft, when such sliding occurs, in particular by reducing wear and ensuring a constant value of the friction torque.
    The foregoing description attempts to describe a particular embodiment by way of nonlimiting illustration and, the invention is not limited to the implementation of certain particular features which have just been described, as for example the forms illustrated and described for the rigid and deformable arms, as well as for the contact regions, or their number.
    The skilled person will not encounter any particular difficulty to adapt the content of the present disclosure to his own needs and implement a wheel for mobile friction comprising a substantially ring-shaped hub, a portion of which is mobile, and having contact regions arranged in extra thickness inside the ring, at least one of which is carried by the movable portion, these contact regions being intended to cooperate with a shaft to center it in the wheel without departing from the scope of the present invention.
    权利要求:
    Claims (12)
    [1]
    1. Wheel (1) for a watch mechanism mobile, intended to cooperate with a shaft (30) of radius R1 by a friction type connection, the wheel (1) having a hub (8), whose inner periphery (10) ) is intended to cooperate with the shaft (30) and, having at least one movable portion (16), by elastic deformation, comprising a first contact region (34) located at least partially inside said inner periphery ( 10) in a rest position and intended to be arranged in contact with the shaft (30) in a service position, in such a waythat the wheel (1) can be made integral in rotation with the shaft (30), when the torque to be transmitted between the wheel (1) and the shaft (30) has a value lower than a predefined value, andthat the wheel (1) can rotate relative to the shaft (30) when said torque to be transmitted between the wheel (1) and the shaft (30) has a value greater than said predefined value,characterized in that said inner periphery (10) has the general shape of a ring of radius R2, slightly greater than R1, and comprises at least first and second additional contact regions (32, 34) arranged in an extra thickness at inside the ring, at a distance from the center of the ring substantially less than or equal to R1, to be able to cooperate with the shaft (30).
    [2]
    2. Wheel (1) according to claim 1, characterized in that said inner periphery (10) comprises at least a third additional contact region (32, 34) arranged relative to one of said first contact region (34) and said first and second additional contact regions (32,34) such that they define therebetween a concavity for performing the function of a lubricant reservoir (36).
    [3]
    3. Wheel (1) according to claim 2, characterized in that said concavity and said contact regions (34) which define it are arranged on said movable portion (16).
    [4]
    4. Wheel (1) according to any one of the preceding claims, characterized in that at least two other contact regions (32, 34) are arranged relative to each other so as to define between them a concavity additional function for providing an additional lubricant reservoir (36).
    [5]
    5. Wheel (1) according to any one of the preceding claims, comprising a serge (2) and at least two rigid arms (6) arranged to make integral with each other said serge (2) and said hub ( 8), characterized in that said movable portion (16) is carried by an elastically deformable arm (14) integral with said serge (2), such that said movable portion (16) is capable of moving according to a substantially radial direction for moving said first contact region (34) from said rest position to said service position and vice versa.
    [6]
    6. Wheel (1) according to claim 5, characterized in that said deformable arm (14) is secured to said serge (2) via one of said rigid arms (6).
    [7]
    7. Wheel (1) according to claim 5, characterized in that said deformable arm (14) is secured to said serge (2) by means of two rigid arms (6), and in that said deformable arm ( 14) has a symmetrical shape with respect to a median of said two rigid arms (6).
    [8]
    8. Wheel (1) according to any one of claims 5 to 7, characterized in that said hub (8) has an opening (12) defining a passage for a head of said deformable arm carrying said contact region or regions (34). ) at its free end and defining said movable portion (16), said opening (12) being shaped to define at least one abutment, for said head, located at a distance from said center of the ring substantially greater than that associated with said service position.
    [9]
    9. Wheel (1) according to any one of claims 5 to 8, characterized in that it comprises at least one stop (20) integral with said serge (2) and arranged to limit at least partially the deformation of said deformable arm (14) when said movable portion (16) moves away from said center of the ring to a predefined distance greater than that associated with said service position.
    [10]
    10. Mobile friction for clockwork mechanism comprising a wheel (1) according to any one of claims 1 to 9 associated with a shaft (30) having at least a portion of substantially cylindrical shape housed in the hub (8) of the wheel .
    [11]
    11. Watch movement comprising a friction wheel according to claim 10.
    [12]
    12. Timepiece comprising a watch movement according to claim 11.
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    同族专利:
    公开号 | 公开日
    CH710467B1|2019-02-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP2002082181A|2001-08-02|2002-03-22|Seiko Epson Corp|Pointer type electronic timepiece|
    EP1895370A2|2006-08-29|2008-03-05|Seiko Instruments Inc.|Wheel attached with jumper for timepiece, wheel structure attached with slip mechanism of timepiece, time correcting structure and timepiece attached with time difference correction|
    EP2112565A1|2008-04-21|2009-10-28|Rolex Sa|Micromechanical component with opening for attachment on an axe|
    EP2765462A1|2013-02-12|2014-08-13|ETA SA Manufacture Horlogère Suisse|Anti-impact centre wheel|EP3825786A1|2019-11-21|2021-05-26|Patek Philippe SA Genève|Display mechanism for a timepiece|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH01927/14A|CH710467B1|2014-12-12|2014-12-12|Wheel for mobile friction watch mechanism and mobile friction corresponding.|CH01927/14A| CH710467B1|2014-12-12|2014-12-12|Wheel for mobile friction watch mechanism and mobile friction corresponding.|
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