WO2018078518A1 - Transmission mécanique - Google Patents

Transmission mécanique Download PDF

Info

Publication number
WO2018078518A1
WO2018078518A1 PCT/IB2017/056582 IB2017056582W WO2018078518A1 WO 2018078518 A1 WO2018078518 A1 WO 2018078518A1 IB 2017056582 W IB2017056582 W IB 2017056582W WO 2018078518 A1 WO2018078518 A1 WO 2018078518A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission chain
transmission
links
chain
sprockets
Prior art date
Application number
PCT/IB2017/056582
Other languages
English (en)
Inventor
Francesco Cozzo
Original Assignee
Specialities S.R.L.
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 Specialities S.R.L. filed Critical Specialities S.R.L.
Publication of WO2018078518A1 publication Critical patent/WO2018078518A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G13/00—Chains
    • F16G13/12—Hauling- or hoisting-chains so called ornamental chains
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B5/00—Making ropes or cables from special materials or of particular form
    • D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/06—Gearings for conveying rotary motion by endless flexible members with chains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F16H9/26—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members with members having orbital motion
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/1004—General structure or appearance

Definitions

  • the present invention relates to a mechanical transmission, particularly of the chain type.
  • the invention presented here is aimed at the field of industrial automation or in any case at all fields in which the need to provide mechanical power transmissions arises.
  • the first type of mechanical transmission consists simply in providing a train of gears by means of which the power is transmitted in each instance among multiple sprockets which are arranged in mutual sequence and mesh with each other.
  • This type of mechanical transmission has the advantage of flexibility during design, since it allows to reduce or multiply the transmitted torque and speed, also allowing reversal of the rotation speed between the driving sprocket and the driven sprocket.
  • it becomes a rigid system, incapable of adapting the working center distance in an easy manner due to the wear of the individual sprockets of which it is constituted.
  • it is a heavy and expensive system.
  • the second type is called Cardan shaft transmission and consists in using a transfer shaft, indeed known as Cardan shaft, which is interposed transversely between a driving sprocket and a driven sprocket, so that they mesh respectively with two sprockets which are arranged at the ends and integral in rotation with the transfer shaft. In this manner, the motion of the driving sprocket is transmitted directly to the driven sprocket.
  • this type of mechanical transmission which is used in various fields of technology, requires intermediate supports adapted to support rotatably the transfer shaft, in particular in the case of long spans and/or high rotation rates.
  • a third type of mechanical transmission uses a belt having a closed profile, which is smooth or provided with teeth on its internal profile and is partially wound around a driving pulley and a driven pulley, which also is provided with teeth or is smooth and/or provided with a peripheral race.
  • This type of mechanical transmission is very light and simpler and cheaper to provide than the preceding described transmissions, allowing to adapt the tension of the belt at any time, for example by using belt tensioners, in order to compensate for example pulley wear.
  • the greatest drawback of this type of mechanical transmission resides in that the belt is subject to aging and can be subject to deformations, with consequent offset between the driving pulley and the driven pulley, for example due to plastic deformations and/or slippages of the belt. Accordingly, a response delay can thus occur between the driving pulley and the driven pulley, for example due to elastic deformations.
  • Another significant drawback is constituted by the tension or preloading that must be imparted and maintained on the connecting element of the pulleys, which these transmissions must have in order to transmit power correctly, which is determined essentially by the friction that must be generated between these connecting elements and the corresponding pulleys.
  • This force affects not only the need for a certain elasticity of the connecting element but also the assured calibration of the connecting element and the consequent need to achieve and maintain this calibration in a precise manner. Furthermore, this force worsens the loads on the elements for supporting the rotary motion of the pulley supporting shafts.
  • the last type of mechanical transmission uses a transmission chain, constituted by metallic links which are mutually articulated so as to form a closed profile of the chain, instead of the belt, and partially wrapped around a driving sprocket and a driven sprocket.
  • This type of mechanical transmission is heavier than the preceding one, but maintains its advantages of flexibility in use and economy in manufacture with respect to the first two while obviating the drawbacks dictated by the deformability of the material of which the transmission belts are made and the need for less tension or preloading, since power transmission occurs essentially by "mechanical engagement" between its links and the set of teeth of the pulleys.
  • patent application US 5,215,616 A describes a classic configuration of a transmission chain, the individual link of which is formed by two rings arranged parallel to each other and mutually associated by two pins.
  • the individual rings are made of polymeric fibers and are shaped so as to have a transverse thickening, so as to form a receptacle for accommodating with abutment the individual pin that has the purpose of meshing between the teeth of a sprocket.
  • the rings made of polymeric material have the task of connecting the pins and operate only by traction.
  • a transmission chain is described the links of which are made of a polymeric material and are shaped, in a mutually alternating manner, like a strap and like a rope in order to allow correct shape mating between them at the respective surrounding portions. With this shape mating, the strap-like link partially wraps around the rope-like link around the contact portion in a mutually complementary manner.
  • German patent DE 10.45.744 B and Japanese patent application TP H03.204423 A both describe transmission chains in which the individual links are constituted by a rigid external body which is provided internally with strong filaments made of polymeric material. In this manner, the meshing and tensile strength of the chain are ascribed separately, respectively, to the shell and to the internal filaments.
  • the aim of the present invention is to devise a mechanical transmission that is capable of obviating the drawbacks observed above, overcoming therefore the limitations of the background art.
  • an object of the present invention is to provide a transmission of the mechanical type that has modest costs, is easy to provide, easy to install and maintain, and capable of withstanding high work loads and chemically aggressive work environments.
  • a mechanical transmission particularly of the chain type, comprising a transmission chain constituted by a plurality of mutually articulated links and partially wound around at least two sprockets, characterized in that said links are made of multilayer closed-loop fabric fibers concatenated with each other in such a manner as to give rise to a transmission chain of the type that is flexible in all directions, and in that the end portion of each one of said links passes through the corresponding end portion of the adjacent link, partially wrapping around it and having a transverse tapered region so as to give the articulation defined between said two links the shape of a so-called spherical toggle.
  • a forming method for providing a transmission chain usable in the mechanical transmission comprising the steps of provision of said transmission chain, engagement of the chain between two forming sprockets, impregnation of the chain with a water-based mixture for the softening, compaction and shaping of the fibers that compose the fabrics of which its links are made; rotation of the impregnated transmission chain around the at least two forming sprockets for a preset number of cycles, preferably in both directions of rotation; drying of the transmission chain.
  • Figure 1 is a front elevation view of the mechanical transmission according to the present invention.
  • Figure 2 is an enlarged- scale view of a first detail of the mechanical transmission shown in Figure 1 ;
  • Figure 3 is an enlarged- scale view of a second detail of the mechanical transmission shown in Figure 1 ;
  • Figures 4 and 5 are two schematic views of the transmission chain used in the mechanical transmission shown in the preceding figures before and after the forming process.
  • the mechanical transmission particularly of the chain type, designated generally by the reference numeral 1, comprises a transmission chain 2 which is constituted by a plurality of mutually articulated links 3, so as to form a transmission chain 2 having a closed profile, i.e., closed onto itself, and partially wrapped at least around two sprockets 4.
  • the individual links 3 of the transmission chain 2 are made of multilayer closed-loop fabric fibers and are mutually concatenated so as to give rise to a transmission chain of the type that is flexible in all directions.
  • said links 3 are made of ultra high molecular weight polyethylene (UHMWPE).
  • UHMWPE ultra high molecular weight polyethylene
  • these links 3 can be made of fabrics composed of different fibers, such as polyamide, Kevlar®, glass fibers and in general of all materials from which fibers that give rise to fabrics are made.
  • each link 3 passes through the corresponding end portion 5b of the adjacent link 3, wrapping around it partially and being provided with a transverse tapered region so as to give the articulation formed between said two links 3 a "spherical toggle" configuration.
  • the two sprockets 4 are provided with an external set of teeth which is complementary with respect to the pitch of the transmission chain 2 so as to mesh thereon in an easy manner.
  • the transmission chain 2 in order to give the transmission chain 2 the correct degree of flexibility and the correct shape, such as to allow its use as a power transmission element with precise meshings with the sprockets 4, the transmission chain 2 can be subjected to a forming process which comprises the following steps:
  • said water-based mixture can be composed of only water or of water and conventional commercial soaps.
  • liquid in which the chain is designed to work can also be constituted by the liquid in which the chain is designed to work, once installed, optionally immersed and/or in any case by a low-viscosity liquid.
  • the transmission chain 2 can be provided, during supply, with fibers that are pretensioned to a predefined value.
  • the low friction coefficient combined with high tenacity, in addition to ensuring perfect operation of the spherical toggle that forms after the forming process, also facilitate the design of the set of teeth of the pulleys and the choice of the materials of which they can be composed.
  • the minimum number of teeth of the pulleys in order to ensure optimum operation of the transmission, is equal to 3, while there is no limitation as regards their maximum number.
  • the optimum transmission ratios are, in particular, all the ones constituted by integers. This occurs regardless of the pitch, understood as the distance "B" indicated in Figure 5, of the rings that compose the links.
  • the teeth of the pulley preferably have a maximum length "Al " measured in the midpoint of the groove bottom connection "R”, preferably slightly smaller (between 0.1 mm and 1 mm) than the internal length "A”, measured on the midpoint of the external radius of the spherical toggle generated after the forming process, of the links that engage thereon.
  • the free length "L” between one tooth and the next and the seat of the links that are not meshing with the teeth can be advantageously slightly greater (between 0.1 mm and 1 mm) than the measurement indicated by "C” in Figure 5 related to said links and always measured on the midpoint of the external radius of the spherical toggle generated after the forming process.
  • the medium radius "Rm” on which the geometry of the pulley and of the set of teeth is to be constructed.
  • the height "FT of the tooth depends on the height "HI " of the links 3 and in general is greater than said measurement "HI " also in relation to the bending radius "Rk" of the head of the tooth.
  • the groove bottom radius "R” is instead preferably slightly smaller (0.2 mm to 0.5 mm) than the external radius of the spherical toggle generated after the forming process and designated by the reference “Rl " in Figure 5.
  • the pitch angle of the tooth "a” can be comprised between 1° and 25° measured, as shown in Figure 3, on a line that is parallel to the radius of the pulley, depending on the torque and speed parameters of the power to be transmitted.
  • connection to the head of the tooth "Rk” can be sized, with respect to the other described geometric parameters, so as to provide a good guide for entry and separation of the links meshing on the pulley and corresponding set of teeth.
  • Figure 3 can preferably be slightly smaller than the internal width "Gl " of the links 3.
  • the pulley can have along its entire circumference a minimum thickness "F" that is slightly larger than the external width "Fl " of the links 3.
  • the pulley can also be provided with two external rings 6, for guiding and containing the links during the step for engagement, grip and release from said pulley.
  • the materials related to the construction of the pulleys can be of various kinds, comprised and chosen within the categories of metals and alloys thereof, of plastic materials or composite materials, and wood.
  • Another advantage of the mechanical transmission according to the present invention resides in that it can be used in power transmissions between two sprockets that do not lie on the same plane, differently from transmissions for example with toothed belts or friction belts.
  • a further advantage of the mechanical transmission according to the present invention resides in that it has an extremely high efficiency, equal to approximately 0.98, understood as the ratio between the energy actually transmitted and the energy to be transmitted.
  • Another advantage of the mechanical transmission according to the present invention resides in that during the production step the fibers of which the links of the chain are made can be pretensioned up to a certain value and in that during operation, after the forming process, the links no longer undergo any elongation where said value is not exceeded.
  • a further advantage of the mechanical transmission according to the present invention resides in that since the transmission chain is made of UHMWPE fibers, by virtue of the self-lubricating capabilities of these materials, differently from mechanical transmissions of the known type it is not necessary to use additional external substances to compensate for the increase in internal frictions and the consequent dispersion of energy needed to overcome these frictions.
  • Another advantage of the mechanical transmission according to the present invention resides in that for uses in environments with temperatures that are compatible with those of the materials of which it is composed, the transmission chain thus conceived has excellent thermal stability, which, together with what has been described previously, makes this type of transmission practically free from any type of maintenance.
  • the materials used may be any according to the requirements and the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)

Abstract

L'invention concerne une transmission mécanique (1), en particulier du type à chaîne, comprenant une chaîne de transmission (2) constituée d'une pluralité de maillons mutuellement articulés (3) afin de former une chaîne de transmission (2) fermée en boucle et partiellement enroulée autour d'au moins deux roues dentées (4) ; les maillons (3) de la chaîne de transmission (2) sont en fibres de tissu à boucle fermée, multicouches, liées les unes aux autres de manière à produire une chaîne de transmission du type flexible dans toutes les directions ; la partie d'extrémité (5a) de chaque maillon (3) passe à travers la partie d'extrémité correspondante (5b) du maillon adjacent (3), s'enroulant partiellement autour de ce dernier et présentant une région transversale conique afin de donner à l'articulation définie entre les deux maillons (3) la forme d'une articulation soi-disant sphérique.
PCT/IB2017/056582 2016-10-24 2017-10-24 Transmission mécanique WO2018078518A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000106679A IT201600106679A1 (it) 2016-10-24 2016-10-24 Trasmissione meccanica, particolarmente del tipo a catena.
IT102016000106679 2016-10-24

Publications (1)

Publication Number Publication Date
WO2018078518A1 true WO2018078518A1 (fr) 2018-05-03

Family

ID=58010273

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/056582 WO2018078518A1 (fr) 2016-10-24 2017-10-24 Transmission mécanique

Country Status (2)

Country Link
IT (1) IT201600106679A1 (fr)
WO (1) WO2018078518A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020233985A1 (fr) * 2019-05-21 2020-11-26 Rud Ketten Rieger & Dietz Gmbh U. Co. Kg Segment de chaîne comprenant des maillons de chaîne textiles constitués de matériau de sangle tordu

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1045744B (de) * 1956-11-05 1958-12-04 Kettenwerke Schlieper Ges Mit Kette aus Kunststoff
JPH03204423A (ja) * 1989-12-29 1991-09-06 Toshio Yoshino リンクチェーンの繊維入り合成樹脂製環状リンク
US5215616A (en) * 1986-03-14 1993-06-01 Envirex Inc. Method for manufacturing a high strength, non-metallic transmission chain
WO2009115249A1 (fr) * 2008-03-17 2009-09-24 Dsm Ip Assets B.V. Chaîne à maillons

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1045744B (de) * 1956-11-05 1958-12-04 Kettenwerke Schlieper Ges Mit Kette aus Kunststoff
US5215616A (en) * 1986-03-14 1993-06-01 Envirex Inc. Method for manufacturing a high strength, non-metallic transmission chain
JPH03204423A (ja) * 1989-12-29 1991-09-06 Toshio Yoshino リンクチェーンの繊維入り合成樹脂製環状リンク
WO2009115249A1 (fr) * 2008-03-17 2009-09-24 Dsm Ip Assets B.V. Chaîne à maillons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020233985A1 (fr) * 2019-05-21 2020-11-26 Rud Ketten Rieger & Dietz Gmbh U. Co. Kg Segment de chaîne comprenant des maillons de chaîne textiles constitués de matériau de sangle tordu

Also Published As

Publication number Publication date
IT201600106679A1 (it) 2018-04-24

Similar Documents

Publication Publication Date Title
US20060252589A1 (en) Adjuster systems for continuous variable transmissions
US8628439B2 (en) Cones, configurations, and adjusters for friction and non-friction dependent continuous variable transmissions
ITMI20002489A1 (it) Catena galle in particolare per trasmissioni a pulegge a gradiniregolabili in modo continuo e procedimento per la sua produzione
US20080058137A1 (en) Cones, configurations, and adjusters for friction and non-friction dependent continuous variable transmissions
US11473648B2 (en) Toothed belt transmission device
CN106415060A (zh) 带附接装置和系统
WO2018078518A1 (fr) Transmission mécanique
CN214242529U (zh) 一种吊轨张紧机构
CA2984452A1 (fr) Mecanisme d'entrainement par courroie
AU2001238605A1 (en) Multi-ribbed CVT belt
US20050059519A1 (en) Belt
US7077774B2 (en) Roller chain transmission device
US499961A (en) Drive-chain
GB2117084A (en) High stretch-resistance hollow pin, small pitch chains with idle rollers
US3975969A (en) Tight chain composite gear device
CN209922199U (zh) 一种网带链条防磨损装置
JP6109148B2 (ja) 高負荷伝動用ｖベルト
US11732782B2 (en) Transmission system
CN214221919U (zh) 同步带机构及机械转动装置
WO2022210728A1 (fr) Courroie dentée et dispositif de transmission à courroie dentée
JP7223896B2 (ja) 歯付ベルト及び歯付ベルト伝動装置
EP1085235A1 (fr) Courroie
RU141362U1 (ru) Цепная передача с внутренним зацеплением
RU1807269C (ru) Предохранительна муфта
JP2022160370A (ja) 歯付ベルト

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17801110

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17801110

Country of ref document: EP

Kind code of ref document: A1