• 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:
    Assembly of pinions (1) to be mounted on a free wheel core (4) of a bicycle hub, comprising: a frustoconical casing (2) with a first opening (21) in its smaller base and a second opening (22) in its greater base, both openings being coaxial with the central axis (10) of said casing; a plurality of pinions (20) with different numbers of teeth to mesh with a chain; an axial fastening element (23), a radial load transmission profile (24) and a toothed profile (25) of torque transmission; where the casing (2), the pinions (20), the axial fastening element (23), the radial load transmission profile (24) and the toothed profile (25) are configured inside the casing (2) next to its smaller base, so that torque transmission is made exclusively from the smaller base of the housing to the hub of the hub. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2656783A1
    申请号:ES201631134
    申请日:2016-08-30
    公开日:2018-02-28
    发明作者:Pablo Carrasco Vergara
    申请人:Rotor Componentes Tecnologicos SL；
    IPC主号:
    专利说明:

    BICYCLE SPROCKET SET
    The present invention relates to a bicycle sprocket assembly; and more particularly, to a multi-gear multi-speed pinion assembly comprising a frusto-conical casing, a plurality of toothed pinions disposed thereon,and torque transmission areas and axial and radial coupling, in which the frusto-conical casing, the pinions and the load transmission areas are configured in one piece and in a way that maximizes the lightness of the assembly. STATE OF THE ART
    Different configurations of sprocket assemblies are known in the industry: with independent sprockets mounted directly to the freewheel hub of the wheel hub; with toothed wheels attached to an intermediate or support element that is the one that transmits the load from the teeth to the hub of the wheel hub; with pinions and support forming a single piece, etc.
    A bicycle sprocket assembly known in the state of the art is provided with a plurality of variable diameter toothed wheels arranged radially around a wheel hub. Each sprocket, normally called a sprocket, has a plurality of teeth spaced around its periphery to engage a bicycle chain. The sprockets are mounted to the hub to transmit the pedaling forces of the bicycle chain to the wheel, usually through an intermediate piece with a freewheel system, known as the hub of the hub.
    In conventional independent sprocket designs, each sprocket can include a torque transmission profile and a radial load transmission profile that mates with a corresponding profile in the hub core. A disadvantage of this design is that the sprockets are acting individually in transmitting the pedaling load from the chain to the hub, so the structure necessary to transmit all the torque from the chain to the hub is multiplied by the number pine nuts from the set, which
    It is a very considerable overweight, which in the bicycle sector is not desired.
    In other devices, the individual sprockets can be linked by an intermediate support making use of arms that receive the load from the sprockets and transmit it to the hub, thereby achieving some weight reduction compared to the set of independent sprockets. By using an intermediate structure for the transmission of loads from the pinions to the hub, the weight of the assembly is penalized again.
    In the support member pinion assemblies described above, the pinions may be attached to the support arms using bolts, mating threads, or the like. These mechanical connections require additional material in the coupling parts, making the assembly heavier.
    Shimano EP0834450A1, Arregui US4121474A, and Bes Francis US4353447A disclose assemblies having sprockets of different sizes that are arranged in multi-part support members, the arrangements of which lead to complex and heavy assemblies.
    Schlanger US6428437B1 shows an assembly having different components, where the independent sprockets are assembled in a housing. This solution also leads to a complex and relatively heavy structure.
    Background antecedents to the present invention are documents Sram EP1972539B1 and Sram US8911314B2 where variations of a set of pinions formed by a piece in the form of a frusto-conical casing with a plurality of toothed pinions formed integrally in said casing, and a cover member in the greater base of the cone, so that the load transmission to the hub is carried out directly from both elements by means of continuous load transmission profiles: one in the casing itself and the other in the cap member.
    In the case of Sram EP1972539B1 a pinion assembly is shown which includes a truncated conical shell and a cap member which
    Mounts on a hub hub. The cover member includes a continuous profile that is both torque transmission and radial support on its outer periphery, which coincides with a similar profile that receives it arranged on the periphery of the larger base of the conical housing radially inwards. the teeth of coupling with the chain.
    In SRAM document US8911314B2, the cover element has teeth on its periphery, forming pinions to mesh with the chain.
    However, these torque transmission profiles made in the cover and in the conical casing, add manufacturing complexity and weight to the whole, with weight reduction on the bicycle being the technical problem par excellence to be solved in this sector. Furthermore, the pinion assemblies are secured to the core by means of a closing nut or bolt, to which the user has to apply a fairly large tightening torque, with which the structure of the frusto-conical casing would collapse due to the axial stress of said screw. that passes through the entire structure of the housing, until it reaches the cover at the other end of the core. Due to this, in practice the pinion assemblies with this construction always make use of a tubular spacer member arranged between the minor base of the cone and the cover, to withstand all the aforementioned compression coming from the closing screw, which again returns to add weight to the set.
    In the frustoconical casing-shaped pinion assembly of the invention, all the aforementioned advantages of the frusto-conical casing-shaped structure are maintained, while reducing the weight of the assembly by a percentage close to 10%. This is achieved by removing, on the one hand, the structure that transmits the torque from the shell profile to the gear profile in the core, and on the other hand, removing the tubular spacer member necessary for the structural reinforcement of its axial anchorage , so that the torque transmission is carried out exclusively directly from the lower base of the frusto-conical housing to the hub hub. SUMMARY OF THE INVENTION
    In the present invention, a set of sprockets is proposed to be mounted on a bicycle hub freewheel core, comprising: a frusto-conical casing that has a first opening at its smaller base and a second opening at its larger base, both being coaxial openings; a plurality of toothed sprockets, which are arranged in the frusto-conical casing and extend radially from the axis of the cone of said casing, with different numbers of teeth spaced around its periphery to mesh with a bicycle chain; an axial fastening element, a radial load transmission profile and a torque transmission toothed profile for transmitting to the freewheel core; where the frusto-conical housing, the toothed pinions, the axial fastening element, the radial load transmission profile and the torque transmission toothed profile are configured in one piece, and arranged towards the interior of the frusto-conical housing close to their base less.
    The radial and torque load transmission zones are therefore located exclusively in the frusto-conical housing to stably support the pinion assembly when mounted on the hub hub, reducing the weight of the assembly. One-piece construction can be accomplished by multiple manufacturing processes, including, for example, casting, forging, or machining. BRIEF DESCRIPTION OF THE FIGURES
    • FIG. 1 shows two views of a technical solution from the closest state of the art of a set of sprockets to be mounted on a bicycle hub freewheel core (4), in which the transmission of torque to the hub is performed through two different members: the frusto-conical casing and the cap member.
    • FIG. 2 shows a perspective view of a preferred embodiment of a pinion assembly (1) to be mounted on a freewheel core
    (4) of bicycle hub, where its main elements appear: a frusto-conical casing (2) with a plurality of toothed pinions (20)
    arranged in it to mesh with a bicycle chain; a fixing member (5), for axially anchoring the frusto-conical casing (2) to the freewheel core (4); a closure member (3) coupled to the larger base of the frusto-conical casing (2), comprising at least one toothed pinion (30) on its periphery provided with teeth to engage with a bicycle chain; and anchoring members (6) for fixing the closure member (3) to the frusto-conical casing (2).
    • FIG. 3 shows a perspective exploded perspective view of the pinion assembly (1) to be mounted on a freewheel core
    (4) of the bicycle hub of Fig. 2, where the anchoring members (6) are shown that are fixed to the respective anchoring means configured in the two coupling members: the fastening means of the closure (37) and the anchoring means of the housing (27). Also shown the toothed core profile
    (Four. Five) configured in the form of grooves along its axis of revolution that mesh in the corresponding toothed torque transmission profile (25) configured in the frusto-conical housing (2).
    • FIG. 4 shows a sectional view and a detail of the pinion assembly (1), in the axial anchorage zone between the smaller base of the frusto-conical casing (2) and the freewheel core (4) by means of a fixing member (5 ) that is threaded to said freewheel core (4) to leave it fixed to the frusto-conical casing (2).
    • FIG. 5 shows a front view of the pinion assembly (1), in which the closing member (3) with toothed pinions (30) and the anchoring members (6) appear.
    • FIG. 6 shows a view of section AA and a detail of Fig. 5. showing the axial fixing element (23) comprising an inner wall (231) and an outer wall (232), the radial load transmission profile (24) and the toothed profile (25) of torque transmission to the freewheel core (4) configured in one piece in the smaller base of the frusto-conical casing (2).
    • FIG. 7 shows a perspective view of the frusto-conical casing (2) that has a plurality of axial protrusions (28) where the anchoring means of the casing (27) are positioned, and the closing member
    (3) including a plurality of recesses (38) where the anchoring means of the closure (37) are positioned, so that said axial protrusions
    (28)  fit into these breaks (38).
    • FIG. 8 shows a sectional view of the pinion assembly (1), where the central axis (10) of the frusto-conical casing (2) appears.
    • FIG. 9 show two different details E and F of Fig. 8 where the frusto-conical casing (2) appears configured as a plurality of annular coaxial cylinders (26) and a plurality of annular coaxial disks (29) according to the axis (10) of the frusto-conical casing (2) alternating in steps. DETAILED EXHIBITION OF A PREFERRED MODE OF REALIZATION
    In a preferred embodiment of the invention, a set of pinions (1) is proposed to be mounted on a bicycle hub freewheel core (4), comprising: a frusto-conical casing (2) having a first opening (21 ) at its smaller base and a second opening (22) at its larger base, both openings being coaxial with a central axis (10) of said frusto-conical casing (2). Furthermore, said frusto-conical casing (2) also has a plurality of toothed pinions (20) with different numbers of teeth, arranged in the frusto-conical casing (2) and extending radially out from the central axis (10) to engage with a bicycle chain . The casing also has various areas of load transmission and fixing, including: an axial fixing element (23) to the freewheel core (4); a radial load transmission profile (24) resting perimetrically on the freewheel core (4); and a toothed torque transmission profile (25) that provides tangential fixation to transmit from the frusto-conical casing (2) to a freewheel core
    (4) provided with a corresponding gear profile (45) to which said toothed torque transmission profile (25) is geared.
    It is an object of the present invention that the frusto-conical casing (2), the toothed pinions (20), the axial fixing element (23), the radial load transmission profile (24) and the transmission toothed profile (25) torque are configured in one piece, and are all arranged towards the inside of the frusto-conical casing (2) and close to its minor base.
    Another object of the present invention is the arrangement of said transmission areas where the axial fixing element (23) restricts the position with respect to the freewheel core (4) according to the direction of the central axis (10) in the direction from the base. less towards the greater base of the frusto-conical casing (2); and so that the axial fixing element (23) is located firstly next to the minor base and adjacent to it are the radial load transmission profile (24) and the toothed profile
    (25) torque transmission.
    In a preferred embodiment of the invention, the axial fixing element (23) is located first the one closest to the smallest base of the frusto-conical casing (2), next is the radial load transmission profile (24) , and finally the toothed torque transmission profile (25). Said torque transmission toothed profile (25) provides tangential fixing to transmit torque to the freewheel core (4), by coupling to a corresponding gear profile (45) arranged on the outer surface of the freewheel core (4).
    The axial fastening element (23) is configured as a protrusion, which extends radially from the frusto-conical casing (2) towards the central axis (10), which comprises an inner wall (231) that restricts the axial displacement of the frusto-conical casing (2) according to the direction of the central axis (10) towards its major base when it comes into contact with the freewheel core (4), and which also includes an outer wall
    (232) which restricts the axial displacement of the frusto-conical casing (2) towards its minor base when it comes into contact with a fixing member (5),
    arranged to axially anchor the frusto-conical casing (2) to the freewheel core (4).
    The radial load transmission profile (24) is configured as a cylindrical cavity for the radial bearing and support of the freewheel core (4).
    In another preferred embodiment of the invention, the pinion assembly
    (one) to be mounted on a bicycle hub freewheel core (4) it comprises a closure member (3) coupled to the larger base of the frusto-conical casing (2), which extends radially from the central axis (10). Said closure member (3) includes a third opening (32) coaxial with the axis of the frusto-conical casing (10) to receive the freewheel core (4). Furthermore, said closure member (3) comprises at least one toothed pinion
    (30) or several on its periphery, provided with teeth extending radially outwards from the central axis (10) to engage a bicycle chain.
    The closing member (3) has, for transmission with the bicycle chain, a greater number of teeth on its outer periphery
    (30) and a diameter larger than the larger toothed pinion (20) adjacent to the frusto-conical casing (2).
    The closure element (3) can include weight reduction openings, for example in the form of arms.
    In an alternative embodiment, the closure member (3), the casing (2), the toothed pinions (20) and the load transmission profiles can form a single piece.
    In another preferred embodiment of the invention, the pinion assembly
    (1) comprises discrete anchoring members (6) for fixing the closure member (3) to the frusto-conical casing (2), which are fixed to respective anchoring means, the closure anchoring means (37) and the housing anchoring means (27). Said anchoring members (6) axially position the closing member (3) with respect to the frusto-conical casing (2), thereby giving axial fixing to said closing member (3). Furthermore, these anchoring members (6) contribute to radial fixation
    of the frusto-conical casing (2) with respect to the freewheel core (4), due to the support of the closing member (3) in the freewheel core (4) through the third opening (32).
    In a preferred embodiment, said anchoring members (6) are configured as threaded screws that pass through corresponding closure anchoring means (37) configured as through openings in the closure member (3), and are threaded to corresponding means for anchoring the casing (27) configured as threaded openings in the frusto-conical casing (2).
    Another object of the present invention is a set of pinions (1) where the larger base of the frusto-conical casing (2) includes a plurality of discrete battlements or axial protrusions (28), where the anchoring means of the casing are positioned ( 27). Likewise, the closure member (3) includes a plurality of corresponding recesses (38) where the closure anchoring means (37) are positioned. Said axial protrusions (28) fit into said recesses (38) so that the coupling between axial protrusions (28) and recesses (38) helps transmit tangential load from the closure member (3) to the frusto-conical casing (2 ).
    In a possible embodiment of the axial protrusions (28), they have two opposite faces arranged to support tangential load in both directions. Similarly, the corresponding recesses (38) where they fit together have two opposite faces arranged to transmit tangential load in both directions.
    In a possible embodiment of the frusto-conical casing (2), it comprises a plurality of coaxial annular cylinders (26) arranged along the axis (10) of the frusto-conical casing (2), and a plurality of coaxial annular disks (29) along the axis (10) of the frusto-conical casing (2), so that the discs (29) and the cylinders (26) are configured alternating in steps. The cylinders (26), the discs (29), the toothed pinions (20) and the load transmission profiles embody a single piece.
    However, said frusto-conical casing (2) can assume any linear or non-linear shape that suitably positions its toothed pinions (20). OTHER FORMS OF REALIZATION
    In an alternative embodiment of the present invention, the frusto-conical casing (2), the toothed pinions (20), the axial fixing element (23), the radial load transmission profile (24) and the transmission toothed profile (25) Torques are configured in one piece, and arranged inside the frusto-conical casing (2) and close to its minor base.
    In this new embodiment, the arrangement of the radial load transmission profile (24) and the toothed torque transmission profile (25) are configured together, forming a single profile configured in the frusto-conical casing (2) that performs the two functions , on the one hand it provides accommodation and radial support for the freewheel core (4), and on the other hand it provides tangential fixation to transmit torque to the freewheel core (4).
    In another alternative embodiment of the present invention, we can manufacture the elements of the pinion set (1) in different materials, to optimize the lightness of the set. As the inter-spacing between consecutive sprockets is limited to the minimum possible in order to have the largest number of sprockets or gears possible, we can change the type of material to increase lightness, as long as we change the geometries of the teeth.
    For this, it must be taken into account that when using high resistance materials for the manufacture of the teeth (such as steel or titanium alloys), which allow us to have smaller tooth thicknesses (around 1.6 mm), it limits the jump in the number of teeth between consecutive sprockets, due to the fact that the bicycle chain is axially limited by the tooth of the consecutive sprocket prior to which it is in gear.
    Alternatively, if we want to use lighter materials such as Aluminum, it allows us to have thicker teeth (around 2
    mm) at equal weight, but since the inter-spacing between consecutive sprockets is limited to the minimum possible, we have to use a greater jump (greater than 3), in the jump of the number of teeth between consecutive sprockets so that the chain of the bicycle has no axial limit due to
    5 to the impact or interference with the tooth of the consecutive pinion previous to the one that is engaged.
    权利要求:
    Claims (1)
    [1]
    Pinion set (1) to be mounted on a freewheel core
    (4) bicycle hub, comprising:
    a frusto-conical casing (2) having a first opening (21) at its smaller base and a second opening (22) at its larger base, both openings being coaxial with a central axis (10) of said frusto-conical casing(2);
    a plurality of toothed pinions (20) with different numbers of teeth, arranged in the frusto-conical casing (2) and extending radially out from the central axis (10) to engage a bicycle chain;
    an axial fixing element (23) to the freewheel core (4);
    a radial load transmission profile (24) resting perimetrically on the freewheel core (4);
    and a toothed torque transmission profile (25) that provides tangential fixation to transmit from the frusto-conical casing (2) to the freewheel core (4) provided with a corresponding gear profile (45);
    where the frustoconical casing (2), the toothed pinions (20), the axial fixing element (23), the radial load transmission profile (24) and the torque transmission toothed profile (25) are configured in a single piece;
    where the axial fixing element (23) restricts the position with respect to the freewheel core (4) according to the direction of the central axis (10) in the direction from the lower base to the larger base of the frusto-conical casing (2);
    and where the axial fixing element (23), the radial load transmission profile (24) and the torque transmission toothed profile (25) are all arranged inside the frusto-conical casing (2) and close to their base smaller, so that the axial fixing element (23) is located firstly next to the minor base and adjacent to it are the radial load transmission profile (24) and the gear transmission profile (25) .

    Pinion set (1) to be mounted on a freewheel core
    (4) of bicycle hub according to claim 1, characterized in that the axial fixing element (23) is configured as a protrusion, which extends radially from the frusto-conical casing (2) towards the central axis (10), which comprises an inner wall ( 231) which restricts the axial movement of the frusto-conical casing (2) according to the direction of the central axis (10) towards its major base when it comes into contact with the freewheel core (4), and which also includes an external wall (232 ) which restricts the axial displacement of the frusto-conical casing (2) towards its minor base when it comes into contact with a fixing member (5), arranged to axially anchor the frusto-conical casing (2) to the freewheel core (4).

    Pinion set (1) to be mounted on a freewheel core
    (4) of bicycle hub according to claim 1, characterized in that the radial load transmission profile (24) is configured as a cylindrical cavity for the accommodation and radial support of the freewheel core (4).
    Pinion set (1) to be mounted on a freewheel core
    (4) of bicycle hub according to previous claims, comprising a closure member (3) coupled to the larger base of the frusto-conical casing (2), which extends radially from the central axis (10), which includes a third opening (32) coaxial with the axis of the frusto-conical casing (10) to receive the freewheel core (4), and where said closing member (3) comprises at least one toothed pinion (30) on its periphery, provided with teeth extending radially out from the central axis (10) to mesh with a bicycle chain, the number of teeth and the diameter being greater than those of the plurality of toothed pinions (20) configured in the frusto-conical casing (2).
    Pinion set (1) to be mounted on a freewheel core
    (4) of bicycle hub according to claim 4, characterized in that it comprises discrete anchoring members (6) for fixing the closure member (3) to the frusto-conical casing (2), which are fixed to respective anchoring means, the closure anchoring means (37) and the housing anchoring means (27).

    Pinion set (1) to be mounted on a freewheel core
    (4) of bicycle hub according to claim 5, characterized in that the anchoring members (6) are configured as threaded screws, the anchoring means of the closure (37) as through openings in the closing member (3), and the anchoring means of the casing (27) as threaded openings in the frusto-conical casing (2).

    Pinion set (1) to be mounted on a freewheel core
    (4) of bicycle hub according to claim 5, where the larger base of the frusto-conical casing (2) includes a plurality of axial protrusions (28) where the anchoring means of the casing (27) are positioned, and where the closing member (3 ) includes a plurality of recesses (38) where the anchoring means of the closure (37) are positioned, so that said axial protrusions (28) fit into said recesses (38) so that the coupling between axial protrusions (28) and recesses (38) aid in the transmission of tangential load from the closure member (3) to the frusto-conical casing (2).

    Pinion set (1) to be mounted on a freewheel core
    (4) bicycle hub according to claim 7, characterized in that the axial protrusions (28) have two opposite faces arranged to support tangential load in both directions.

    Pinion set (1) to be mounted on a freewheel core
    (4) bicycle hub according to claim 7, characterized in that the recesses (38) have two opposite faces arranged to transmit tangential load in both directions.



    Pinion set (1) to be mounted on a freewheel core
    (4) of bicycle hub according to previous claims, where the frusto-conical casing (2) comprises a plurality of annular coaxial cylinders
    (26)  arranged along the axis (10) of the frusto-conical casing (2), and a plurality of annular coaxial disks (29) along the axis (10) of the frusto-conical casing (2), so that the disks (29) and the cylinders (26) are configured alternating in steps.

     FIG. one 
    16

    3 FIG. 2 one
    4 62
    twenty 30one
    3
    5

     FIG. 3 

     FIG. 4
    2
    fifteen
    2twenty24
    19

     FIG. 4 2
    4 51 25
    524

     FIG. 5 
    32

     FIG. 6 2
    2. 3231
    2425

     FIG. 7
    37

     FIG. 8
    28

    FIG. 9
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    US20210284281A1|2021-09-16|
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