WO2014023336A1 - Chaîne de transmission munie de rouleaux ou de bagues comprenant un maillon interne à arrière convexe et comprenant un maillon externe plus petit en forme d'arachide - Google Patents

Chaîne de transmission munie de rouleaux ou de bagues comprenant un maillon interne à arrière convexe et comprenant un maillon externe plus petit en forme d'arachide Download PDF

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Publication number
WO2014023336A1
WO2014023336A1 PCT/EP2012/065425 EP2012065425W WO2014023336A1 WO 2014023336 A1 WO2014023336 A1 WO 2014023336A1 EP 2012065425 W EP2012065425 W EP 2012065425W WO 2014023336 A1 WO2014023336 A1 WO 2014023336A1
Authority
WO
WIPO (PCT)
Prior art keywords
chain
link
links
plates
comprised
Prior art date
Application number
PCT/EP2012/065425
Other languages
English (en)
Inventor
Giuseppe Baddaria
Original Assignee
Borgwarner Inc.
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 Borgwarner Inc. filed Critical Borgwarner Inc.
Priority to PCT/EP2012/065425 priority Critical patent/WO2014023336A1/fr
Publication of WO2014023336A1 publication Critical patent/WO2014023336A1/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
    • F16G13/02—Driving-chains
    • F16G13/06—Driving-chains with links connected by parallel driving-pins with or without rollers so called open links

Definitions

  • the present invention relates to a transmission chain with rollers or bushings with inner link with convex back and smaller outer link with a "figure of eight" or peanut shape, particularly suitable for the transmission of motion between rotating shafts in the automotive field.
  • Chain transmissions are among the means most used for transmitting power between two or more parallel rotating shafts: the chains used for the commanding of distribution in internal combustion engines are generally constituted by metal chains of the type with rollers or with bushings and provide for the use of chain tensioner and of chain guides for maintaining the proper tension of the chain itself should these chains be used in the automotive field.
  • Roller and bushing chains formed by links with "figure of eight" shape are normally used in transmissions in the motorcycle and industrial chains world: these chains are not used in the automotive sector in that the lack of contact surface provided by the "figure of eight" profile for the guide and chain tensioner slides would entail an excessive contact pressure and consequently excessive wear of the plastic surface of the slides. It is in order to limit this wear that many chains for applications in the automotive field provide inner and outer links with straight back (flat) so as to provide the chain tensioner with a large contact surface, reducing the pressure on this area.
  • chains composed of "curved" (convex) inner and outer links and no longer straight with an appropriate radius on the back.
  • the object of the present invention is that of overcoming, at least in part, the disadvantages of the prior art by providing an improved distribution chain for automotive use, in particular as regards the reduction in the coefficient of friction between the plastic of the chain tensioner and chain guides and the chain itself, and the reduction in its overall weight without worsening the fatigue limit (tensile strength).
  • a further objective is that of providing such a chain that is also easy to make, economical and which can be obtained with the least possible amount of scrap.
  • An objective of the present invention relates to a chain with rollers or bushings built to bear against chain tensioner and chain guides for distribution chains for automotive use, with at least one row, constituted by a succession of outer links connected to a succession of inner links so as to be provided, along the direction of its thickness, with at least one inner link and one outer link, wherein the inner links are with "convex" back, while the outer links are in the shape of a peanut or "figure of eight".
  • said outer links have a lower height compared to that of the inner links so that the profile of each inner link projects, both above and below, in relation to that of each outer link.
  • the overall weight of the chain will be lower than that of the chains with all the links with curved back in light of the smaller size of the outer links, that is to say of the smaller height and of their "figure of eight" shape.
  • Outer link here is intended to identify that which in the art is also referred to as link with pins, i.e. a pair of pins with parallel axes restrained one to the other by two outer connection plates rigidly connected one to the other.
  • Inner link here is intended to identify that which in the art is also referred to as a link- block, i.e. a rigid block formed by two bushings with parallel axes, optionally carrying two respective rollers, restrained one to the other rigidly by two plates (bushing link) generally with the same pitch of the pins of the outer link, said bushings being rotatably mounted on the pins of adjacent outer links.
  • a link- block i.e. a rigid block formed by two bushings with parallel axes, optionally carrying two respective rollers, restrained one to the other rigidly by two plates (bushing link) generally with the same pitch of the pins of the outer link, said bushings being rotatably mounted on the pins of adjacent outer links.
  • Chains with single row are intended here to identify chains where each inner link (link-block) is connected to two adjacent outer links (links with pins) connecting them one to the other, and where an outer link (link with pins) is connected to two adjacent inner links (links-block), connecting them one to the other, said connection being formed by means of the insertion of the aforesaid pins in the aforesaid rollers or bushings.
  • Figs, la and lb are respectively a front view and a plan view of a portion of chain according to the present invention.
  • Fig. lc is an enlarged front view of some links forming the portion of chain of Fig. la
  • Fig. 2 is a perspective view of some links forming the portion of chain of Fig. la
  • Fig. 3 is a perspective view illustrating the layout of the chain of the invention on a car engine in combination with a chain tensioner and a chain guide;
  • Fig. 4 is a plan view showing schematically the process of blanking of plates of the outer links
  • Fig. 5 is a perspective view of some links, partially sectioned, forming the portion of chain of Fig. la.
  • This chain 100 is formed by a succession of inner links 2 whose plates are provided with a convex back 3, which are arranged adjacent one to the other and in succession so as to form at least one row of inner links 2 (Fig. 2).
  • Each plate of each inner link 2 has a pair of holes for receiving respective rollers or bushings which allow the connection one to the other of the two plates forming the inner link 2, keeping them distanced at the same time.
  • the distance, D, between the two plates of an inner link 2 (Fig. lb) is not binding for the purpose of the present invention and depends on the conditions wherein this chain will have to operate and on the dimensions, ⁇ , of the rollers or bushings: generally this distance D is comprised between 3.50 mm and 5.72 mm. In an exemplary embodiment this distance D is approximately 5.50 mm.
  • this distance P is comprised between 7 mm and 9.525 mm. In an exemplary embodiment this distance, or pitch P (Fig. la), between said holes of each inner link 2, is approximately 9.525 mm.
  • the diameter ⁇ of the two openings of a same inner link plate 2 is not binding for the purpose of the present invention and depends on the conditions wherein this chain will have to operate and on the dimensions of the rollers or bushings to be inserted in said openings: generally this diameter ⁇ is comprised between 4 mm and 6.35 mm. In an exemplary embodiment the diameter of each bushing or roller of the inner links 2 is approximately 6.35 mm.
  • each outer link 1 is formed by two plates positioned externally with respect to the plates of the inner links 2 and staggered with respect to said plates of inner links 2.
  • Each plate of each outer link 1 has also a pair of holes for receiving respective pins 4 which allow the connection one to the other of the outer links 1 to the inner links 2 when said pins 4 are inserted simultaneously in the holes of the outer links 1 and inside the bushings or rollers of the inner links 2, after having aligned coaxially with said bushings or rollers with said holes of said outer links 1.
  • the distance between the two central axes of two adjacent holes belonging to two outer links 1 is not binding for the purpose of the present invention but is substantially equal to the distance between the two central axes of the two holes of a same inner link 2, i.e. to the pitch P: generally this pitch P is comprised between 7 mm and 9.525 mm. In an exemplary embodiment said pitch p between said outer links 1 is approximately 9.525 mm.
  • outer links 1 of the present chain 100 are characterised in that formed by plates having a "figure of eight" or peanut shape.
  • each inner link 2 projects, both above and below, with respect to each outer link 1 since the maximum height of each outer link 1 taken on the vertical at the axis of a pin 4, here also denoted by H e , is smaller in relation to the height of each inner link 2 taken on the same vertical, also denoted here by Hi. In this way the contact of the slide (sliding element) with said outer links 1 is prevented.
  • Chain tensioner here is intended to identify any known tensioning device, generally with slide, used to keep the chain taut and attached to the engine block, provided with a slide or sliding element which is pushed by hydraulic or elastic means against a strand of the chain in order to compensate for a certain slack of the chain.
  • An example of such a chain tensioner is illustrated in Figure 3 with reference numeral 7.
  • Chain guide here is intended to identify any element suitable for guiding the movement of the chain without exerting any thrust, generally positioned on the opposite side to the slide (or sliding element) of the chain tensioner. An example of this chain guide is illustrated in Figure 3 with reference numeral 5.
  • the heights 3 ⁇ 4 and H e of the links, respectively, inner 2 and outer 1 of the present chain 100 are not binding for the purpose of the present invention: generally the overall height H e of the outer link 1 is comprised between 6.10 mm and 9.20 mm. In a preferred embodiment the overall height H e of the outer link 1 is approximately 9.18 mm while that of the inner link 2 is approximately 9.78 mm.
  • the overall difference between the two heights, 3 ⁇ 4-3 ⁇ 4 is generally comprised between 0.2 mm and 1 mm at most: in a preferred embodiment this difference of heights Hj-He is approximately 0.6 mm, i.e. the profile of the inner link 2 projects, both above and below, in relation to that of the outer link 1 by approximately 0.3 mm.
  • the plates of the outer links 1 have a thickness SI calculated so as to generate a section A e resistant to traction which is equivalent to the section A; of the inner links 2 of thickness S2, as illustrated in Fig. 5.
  • the areas A e and Aj considered above are those resulting from the vertical section made at the axis of a pin 4.
  • the thickness SI of the plates of the outer link 1 is comprised between 1.0 mm and 1.4 mm, preferably it is approximately 1.27 mm; the thickness S2 of the plates of the inner link 2 is generally comprised between approximately 1.20 mm and 1.8 mm, preferably it is 1.53 mm.
  • the radius of curvature R of the back 3 of the plates of the inner link 2 is comprised between 50-200 mm, preferably 150 mm.
  • the plates of the inner links 2 and the outer links 1 are formed by means of a process of blanking: in particular the plates of the outer links 1 with a "figure of eight" shape are obtained from a sheet 6 whereon the holes are first formed for the passage of pins 4 and subsequently the plates with a "figure of eight" or peanut shape are blanked in positions staggered one in relation to the other, as shown in Fig. 4.
  • the advantages of the present chain 100 are not only technical in nature but also economic since the "figure of eight" profile makes it possible to obtain, for the same sheet, a greater number of figure of eight links compared to that of other shapes of links, thanks to the complementarity of shape between the curves of the "figure of eight” and the notch between said two curves which allows the figures of the blanking mould to be brought closer together: in fact the area left free by the notch between the two curves of the figure of eight of a first link is occupied by one of the two curves of the figure of eight of a second adjacent link thus reducing the scrap after blanking.
  • the cost of the present chain is smaller not only because for every outer link a smaller amount of material is used (thanks to the smaller height and thickness of the plates), but also because the back 8 of the outer links (Figure 5), which does not come into contact with the chain guide 5 or with the chain tensioner slide 7, does not have to be surface finished, contraiy to what occurs in chains with links with curved or flat back where all the links come into contact with the chain tensioner and chain guides.
  • the present chain 100 has the advantage of having both a reduced coefficient of plastic-chain friction but also a reduced overall weight without however reducing the fatigue limit (tensile strength) of the chain, which is comparable to that of other chains which can be adopted for the same use, and the efficiency of distribution.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention concerne une chaîne (100) munie de rouleaux ou de bagues construite pour appuyer contre un dispositif de mise sous tension de chaîne pour la distribution de chaînes pour le secteur automobile, au moins une rangée étant constituée par une succession de maillons externes (1) reliée à une succession de maillons internes (2) et qui comporte le long de la direction de son épaisseur au moins un maillon interne et un maillon externe, les maillons internes (2) ayant un arrière « convexe », tandis que les maillons externes (1) sont en la forme d'arachide ou du « huit de chiffre » et ont une hauteur plus petite par comparaison à celle des maillons internes (2).
PCT/EP2012/065425 2012-08-07 2012-08-07 Chaîne de transmission munie de rouleaux ou de bagues comprenant un maillon interne à arrière convexe et comprenant un maillon externe plus petit en forme d'arachide WO2014023336A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/065425 WO2014023336A1 (fr) 2012-08-07 2012-08-07 Chaîne de transmission munie de rouleaux ou de bagues comprenant un maillon interne à arrière convexe et comprenant un maillon externe plus petit en forme d'arachide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/065425 WO2014023336A1 (fr) 2012-08-07 2012-08-07 Chaîne de transmission munie de rouleaux ou de bagues comprenant un maillon interne à arrière convexe et comprenant un maillon externe plus petit en forme d'arachide

Publications (1)

Publication Number Publication Date
WO2014023336A1 true WO2014023336A1 (fr) 2014-02-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/065425 WO2014023336A1 (fr) 2012-08-07 2012-08-07 Chaîne de transmission munie de rouleaux ou de bagues comprenant un maillon interne à arrière convexe et comprenant un maillon externe plus petit en forme d'arachide

Country Status (1)

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WO (1) WO2014023336A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10655671B2 (en) 2016-12-29 2020-05-19 Goodrich Corporation Nested bushing arrangement
US11988267B2 (en) * 2021-10-18 2024-05-21 Tsubakimoto Chain Co. Chain

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007001397U1 (de) * 2006-02-09 2007-03-29 KMC Chain Industrial Co., Ltd., Hsin Hua Kettengliedplatte mit hoher Festigkeit
US20070082776A1 (en) * 2005-10-12 2007-04-12 Kenichi Nagao Roller chain
US20100093475A1 (en) * 2008-10-14 2010-04-15 Tsubakimoto Chain Co.. Chain
US20110263369A1 (en) * 2010-04-26 2011-10-27 Tsubakimoto Chain Co., Chain

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070082776A1 (en) * 2005-10-12 2007-04-12 Kenichi Nagao Roller chain
DE202007001397U1 (de) * 2006-02-09 2007-03-29 KMC Chain Industrial Co., Ltd., Hsin Hua Kettengliedplatte mit hoher Festigkeit
US20100093475A1 (en) * 2008-10-14 2010-04-15 Tsubakimoto Chain Co.. Chain
US20110263369A1 (en) * 2010-04-26 2011-10-27 Tsubakimoto Chain Co., Chain

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10655671B2 (en) 2016-12-29 2020-05-19 Goodrich Corporation Nested bushing arrangement
US11988267B2 (en) * 2021-10-18 2024-05-21 Tsubakimoto Chain Co. Chain

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