WO2024115978A1 - Procédé de construction d'un groupe de rayons et écrous pour roues à rayons et groupe de rayons et écrous ainsi obtenu - Google Patents

Procédé de construction d'un groupe de rayons et écrous pour roues à rayons et groupe de rayons et écrous ainsi obtenu Download PDF

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Publication number
WO2024115978A1
WO2024115978A1 PCT/IB2023/058577 IB2023058577W WO2024115978A1 WO 2024115978 A1 WO2024115978 A1 WO 2024115978A1 IB 2023058577 W IB2023058577 W IB 2023058577W WO 2024115978 A1 WO2024115978 A1 WO 2024115978A1
Authority
WO
WIPO (PCT)
Prior art keywords
spoke
threading
nipple
constructing
insert
Prior art date
Application number
PCT/IB2023/058577
Other languages
English (en)
Inventor
Guido Cappellotto
Original Assignee
Alpina Raggi S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alpina Raggi S.P.A. filed Critical Alpina Raggi S.P.A.
Publication of WO2024115978A1 publication Critical patent/WO2024115978A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B1/00—Spoked wheels; Spokes thereof
    • B60B1/02—Wheels with wire or other tension spokes
    • B60B1/04—Attaching spokes to rim or hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B1/00—Spoked wheels; Spokes thereof
    • B60B1/02—Wheels with wire or other tension spokes
    • B60B1/04—Attaching spokes to rim or hub
    • B60B1/041—Attaching spokes to rim or hub of bicycle wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B1/00—Spoked wheels; Spokes thereof
    • B60B1/02—Wheels with wire or other tension spokes
    • B60B1/04—Attaching spokes to rim or hub
    • B60B1/043—Attaching spokes to rim
    • B60B1/044—Attaching spokes to rim by the use of spoke nipples

Definitions

  • the invention refers to a method for constructing a spoke and nipple group for spoked wheels and to a spoke and nipple group thus obtained.
  • nipples it is known to construct so-called self-locking nipples to be coupled to the threaded end of a spoke for constructing a spoked wheel. Generally, but not necessarily, these nipples are applied at the wheel rim and the spokes connect them via the wheel rim and hub.
  • the spokes with one or both axial threaded ends to allow their coupling to the nipple.
  • the threading of the end of the spoke is constructed by means of rolling, that is, by means of cold mechanical deformation of the area to be threaded by means of dies between which the end of the nipple is compressed and rotated.
  • flat dies are used bearing the imprints of the desired thread.
  • This threading procedure is currently widespread as it confers numerous advantages, including easy automation, hardening that strengthens the threaded area, and a low production cost.
  • it causes a problem when the spoke is intended to be used in a nipple of the self-locking type as defined in the preamble of the main claim.
  • the technical problem addressed and solved at least in part by the present invention is to make available a new method for constructing a spoke and nipple group for spoked wheels that is functionally and structurally conceived to largely avoid the drawbacks complained of with reference to the cited prior art.
  • a main aim of the invention is to make available a method that allows to attenuate, if not completely eliminate, the mounting defects of the spoked wheels caused by the deformation or expulsion of the self-locking insert of the nipple during screwing.
  • - core diameter is the diameter measured on the bottom of the thread of a screw or on the crest of the threads of a nut screw
  • - crest diameter is the diameter measured on the bottom of the thread of a nut screw or on the crest of the threads of a screw pitch: is the distance measured in the axial direction between two crests or two contiguous thread grooves of a threading.
  • a spoke and nipple group for spoked wheels comprising the steps of:
  • nipple by applying in the hole of the semi-finished nipple product a deformable insert in which a passage is made having such a diameter as to be coupled with interference to the threading of the spoke when it is screwed into the nipple and the insert.
  • the method comprises the further step of constructing on said at least one end of the threaded spoke a tapered portion starting from a minimum diameter less than or equal to the core diameter of the threading of the spoke.
  • an axial extent of the tapered portion is at least twice the pitch of said threading.
  • the preferred tapering angle is approximately 20°, but it may vary as needed.
  • the invention also concerns a spoke and nipple group obtained according to the method indicated above.
  • the adoption of this group in the assembly of spoked wheels allows to minimize the need for control of the assembled wheel significantly increasing the degree of safety for the user with regard to what concerns the effective self-locking of the nipples with respect to the respective spokes.
  • Figure 1 is a side elevational view of one end of a spoke of the group according to the invention.
  • Figures 2 to 6 are views in axial section of a nipple in the different and consecutive machining steps for use in the group of the invention.
  • an end of a spoke is indicated with 2, overall indicated with 1, on which a threading 3 is obtained.
  • the spoke 1 has an axially elongated rod-shaped stem 4 and can be obtained starting from a rod coil that is straightened and cut into bars having the desired length to be then subjected to forming by means of cold deformation.
  • the spoke 1 advantageously extends along a longitudinal axis X thereof.
  • the final forming step may comprise forming the threading 3 which is preferably obtained by means of rolling between two flat dies or more cylindrical roller dies. Evidence that the threading 3 is produced in this way arises from the fact that the crest diameter of the threading 3 exceeds the diameter of the stem 4, having been subjected to deformation to produce both the crests and the grooves of the threads.
  • the threading can be preceded or followed by a further step of constructing on the threaded free end 2 of the spoke 1 a tapered portion 5 preferably obtained starting from a minimum diameter DI less than or equal to a core diameter of the threading 3 of the spoke 1 until it progressively reaches a maximum diameter D2 equal to a crest diameter of the threading 3.
  • the maximum diameter D2 is equal to the crest diameter of the threading 3 measured at the crests that are the most radially distant from the longitudinal axis X of the spoke 1.
  • An axial extent A of the tapered portion 5 may preferably extend from the minimum diameter section DI to the maximum diameter section D2. Such an axial extent A is preferably at least twice a threading pitch 3 or slightly less than it.
  • a tapering angle R. with respect to the longitudinal axis X of the spoke 1 is preferably comprised between 15° and 30°, even more preferably it has a value of approximately 20°.
  • the group further comprises a self-locking type nipple 10.
  • the nipple 10 can be constructed starting from a semi-finished product obtained by means of cold forming and a tubular ring insert 12 made of a deformable material, for example a plastic material such as a polyamide.
  • the ring 12 is centrally affected by a passage 17.
  • the semi-finished product has a body that extends along a longitudinal axis Y bearing on one end a head 13 formed with an imprint 14 for a manoeuvring wrench through which the nipple 10 can be rotated around the axis Y while the wheel is being mounted.
  • the imprint 14 in the illustrated example is internal to the head 13, but in other cases it is possible to construct external imprints in a completely equivalent manner.
  • the body of the nipple 10 is affected by an axial hole 15 which can be passing-through, like in the example illustrated, or blind, in the case of nipples for tubeless wheels.
  • a seat 16 for the insert 12 is then machined which in the example illustrated is cylindrical but can take on other shapes, which are in any case correlated to the external shape of the insert 12 itself.
  • the seat 16 is obtained in an intermediate portion of the nipple 10, which is coaxially to the hole 15, and is recessed with respect to the hole 15 itself in such a way that the insert 12, once it is inserted, is retained axially in the nipple 10 and cannot be easily ejected.
  • the hole 15 is then threaded and, subsequently, the insert 12 is inserted.
  • a nipple 10 with insert 12 that is positioned in the seat 16 is depicted in Figure 6. Note that the threading of the hole 15 is compatible in pitch and size with the threading of the spoke 1 and that the inner diameter of the insert 12 is less than the crest diameter of the threading 3 of the spoke 1, but greater than or equal to the minimum diameter DI of the tapered portion 5.
  • the diameter of the passage 17 is chosen such as to allow entry into the insert 12 of the minimum diameter DI of the tapered portion 5 and to allow a coupling with interference to the threading 3 of the spoke 1 when it is screwed into the nipple 10 and the insert 12.
  • the progressive advancement of the tapered portion 5 in the passage 17 can cause an expansion of the insert 12 which is crushed against the walls of its seat 16 adhering thereto with a high friction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

Procédé de construction d'un rayon (1) et d'un écrou (10) comprenant les étapes consistant : à construire un produit de rayon semi-fini présentant un corps en forme de tige doté d'extrémités axiales opposées, à fileter au moins une extrémité (2) desdites extrémités axiales en obtenant un filetage (3), à construire un produit d'écrou semi-fini comportant un trou axial (15) fileté avec un filetage compatible avec le filetage du rayon, à construire un écrou en appliquant dans le trou un insert déformable (12) dans lequel un passage (17) doté d'un diamètre devant être accouplé au filetage du rayon, moyennant quoi une partie conique (5) sur ladite au moins une extrémité filetée du rayon est construite à partir d'un diamètre minimal (D1) inférieur ou égal au diamètre de noyau du filetage du rayon et présentant une étendue axiale (A) d'au moins deux fois le pas dudit filetage.
PCT/IB2023/058577 2022-11-30 2023-08-30 Procédé de construction d'un groupe de rayons et écrous pour roues à rayons et groupe de rayons et écrous ainsi obtenu WO2024115978A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102022000024726 2022-11-30
IT202200024726 2022-11-30

Publications (1)

Publication Number Publication Date
WO2024115978A1 true WO2024115978A1 (fr) 2024-06-06

Family

ID=85462299

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2023/058577 WO2024115978A1 (fr) 2022-11-30 2023-08-30 Procédé de construction d'un groupe de rayons et écrous pour roues à rayons et groupe de rayons et écrous ainsi obtenu

Country Status (1)

Country Link
WO (1) WO2024115978A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012113599A1 (fr) * 2011-02-22 2012-08-30 Alpina Raggi S.P.A. Procédé pour fabriquer des tétons autobloquants
WO2022101730A1 (fr) * 2020-11-10 2022-05-19 Alpina Raggi S.P.A. Écrou autobloquant pour rayons de roues à rayons et procédé de fabrication d'un tel écrou

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012113599A1 (fr) * 2011-02-22 2012-08-30 Alpina Raggi S.P.A. Procédé pour fabriquer des tétons autobloquants
WO2022101730A1 (fr) * 2020-11-10 2022-05-19 Alpina Raggi S.P.A. Écrou autobloquant pour rayons de roues à rayons et procédé de fabrication d'un tel écrou

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