US20030050140A1 - Synthetic resin guide for transmission device - Google Patents

Synthetic resin guide for transmission device Download PDF

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Publication number
US20030050140A1
US20030050140A1 US10/226,900 US22690002A US2003050140A1 US 20030050140 A1 US20030050140 A1 US 20030050140A1 US 22690002 A US22690002 A US 22690002A US 2003050140 A1 US2003050140 A1 US 2003050140A1
Authority
US
United States
Prior art keywords
guide
synthetic resin
rail
resin
reinforcing ribs
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US10/226,900
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English (en)
Inventor
Masahiko Konno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsubakimoto Chain Co
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to TSUBAKIMOTO CHAIN CO. reassignment TSUBAKIMOTO CHAIN CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONNO, MASAHIKO
Publication of US20030050140A1 publication Critical patent/US20030050140A1/en
Priority to US11/043,816 priority Critical patent/US7393487B2/en
Abandoned legal-status Critical Current

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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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/18—Means for guiding or supporting belts, ropes, or 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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0872—Sliding members

Definitions

  • This invention relates to guides for sliding engagement with chains, belts and other power transmission media such as those used in a motor vehicle engine or the like for transmitting power from a driving sprocket or pulley to a driven sprocket or pulley.
  • These guides may be fixed guides, or movable guides associated with tensioners. More specifically, the invention relates to improvements in guides formed of synthetic resins.
  • a movable or fixed guide is attached to a body frame, such as an engine block wall, by a mounting bolt, a pin or the like.
  • the chain, belt, or other power transmission medium travels in sliding contact with the guide
  • the guide In the case of a movable guide, which may be in the form of a tension lever or the like, the guide provides the power transmission medium with appropriate tension to prevent transmission failure resulting from excessive stretching, or excessive loosening, of the power transmission medium.
  • a fixed guide such as a guide rail or the like, limits the power transmission medium to a predetermined traveling path to prevent vibration noise, side vibration, and disengagement.
  • FIG. 13 illustrates an example of a conventional synthetic resin guide 100 for a tensioner lever.
  • the guide 100 comprises a slide rail 101 , which is in sliding contact with a traveling chain C, and a rail-supporting member 102 provided on the back side of the slide rail 101 .
  • the rail supporting member 102 includes a boss 102 a having a mounting hole 103 for pivoting attachment to an engine block wall.
  • the rail supporting member also includes a tensioner abutting portion 102 b , which cooperates with a tensioner (not shown) for providing appropriate tension to prevent transmission failure resulting from excessive stretching, or excessive loosening, of the chain.
  • the synthetic resin guide 100 includes a plurality of thick reinforcing ribs 102 c , each formed at suitable intervals along the rail supporting member 102 , to enhance the mechanical properties and toughness of the guide 100 .
  • the conventional synthetic resin guide 100 has several problems preventing it from exhibiting good mechanical properties and toughness.
  • the reinforcing ribs 102 c extend substantially perpendicular to the direction of injection of the synthetic resin P.
  • the flow of the injected synthetic resin P which, as shown in FIG. 14, comprises a skin layer-forming resin P 1 and a core layer-forming resin P 2 , exhibits a stagnant fluid state within and around the interior of the reinforcing ribs 102 c .
  • the residence, eddy flow, and turbulent flow of the resin P prevent the resin from achieving a strain-free molecular orientation in the interior of the reinforcing ribs 102 c . Consequently, the peripheral portions of the ribs are solidified in an strained state.
  • the orientation strain not only causes cracks due to loading during power transmission, but also causes thermal shrinkage resulting from a non-crystalline region in the synthetic resin P. Accordingly, strains such as warpage, torsion and the like occur in a high temperature environment such as in an automobile engine, and the guiding function is not entirely satisfactory.
  • objects of the invention are to solve the above-mentioned problems encountered in the prior art, and to provide a synthetic resin guide for a transmission device including reinforcing portions, which exhibits greater strength and toughness, and in which strains such as warpage, torsion and the like in a high temperature environment are significantly reduced.
  • the synthetic resin guide in accordance with the invention comprises an elongated rail for longitudinal sliding engagement with a power transmission medium, and a rail supporting member molded as a unit with the rail.
  • the supporting member comprises a plurality of reinforcing ribs which support the rail. These ribs are distributed along the length of the transmission device from a location adjacent one end of the rail to a location adjacent the opposite end of the rail.
  • the guide is formed by injection molding, and, in order to achieve the above-mentioned objects, the reinforcing ribs extend in directions such that the flow of synthetic resin during injection molding substantially follows the longitudinal directions of the reinforcing ribs.
  • the synthetic resin is a glass fiber reinforced resin.
  • the synthetic resin guide in accordance with the invention may be either a fixed guide or a movable guide.
  • any arrangement such as an S-shaped arrangement, a curved arrangement, a truss-shaped arrangement, a vein-shaped arrangement, a honeycomb-shaped arrangement, or the like, may be used.
  • the injection molding process used to produce the synthetic resin guide according to the invention can be an injection molding process in which resin processing is integrally carried out from one end portion in a longitudinal direction of the guide toward the other end portion.
  • any process such as a typical injection molding process using a single synthetic resin, a two-color injection molding process using two kinds of synthetic resins, a sandwich injection molding process in which a core layer resin is injected inside a skin layer, or the like, may be used.
  • the reinforcing rib portions which supports the slide rail extend in directions following the flow of synthetic resin during injection molding of the guide.
  • the reinforcing rib portions behave as auxiliary flow paths, which lead the synthetic resin injected during the injection molding of the guide from one end portion in a longitudinal direction of the guide toward the other end portion, so that injected synthetic resin flows throughout the guide without significant flow resistance, so that the injected synthetic resin flows smoothly to the end of the synthetic resin guide.
  • the synthetic resin Since the synthetic resin is fully molecularly-oriented when solidified, the crystal region of the synthetic resin is increased and thermal shrinkage of the guide is reduced. Furthermore, the pressure required for injection molding of the guide can be reduced to a lower level than in the conventional case, and the injection time can also be reduced.
  • FIG. 1 is a front elevational view illustrating a transmission guide in accordance with the invention in use in a motor vehicle engine
  • FIG. 2 is a schematic elevational illustrating the flow of resin during injection molding of a guide in accordance with the invention
  • FIG. 3 is a cross-sectional view of a reinforcing rib taken on plane A-A in FIG. 2;
  • FIG. 4 is a cross-sectional view corresponding to FIG. 3, but illustrating a case in which a glass fiber reinforcing resin is used;
  • FIG. 5 is a schematic elevational view showing the relationship between an S-shaped reinforcing rib and the flow of resin
  • FIG. 6 is a schematic elevational view showing the relationship between a truss-shaped reinforcing rib and the flow of resin
  • FIG. 7 is a schematic elevational view showing the relationship between radial, linear, reinforcing ribs and the flow of resin
  • FIG. 8 is a schematic elevational view showing the relationship between radial, curved, reinforcing ribs and the flow of resin
  • FIG. 9 is a schematic elevational view showing the relationship between linear, vein-shaped, reinforcing ribs and the flow of resin;
  • FIG. 10 is a schematic elevational view showing a relationship between curved, vein-shaped, curve reinforcing ribs and the flow of resin;
  • FIG. 11 is a schematic elevational view showing the relationship between honeycomb-shaped reinforcing ribs and the flow of resin
  • FIG. 12 is a schematic elevational view showing the relationship between reinforcing ribs formed in a number-sign pattern and the flow of resin.
  • FIG. 13 is a view illustrating an example of a conventional synthetic resin guide for a transmission device
  • FIG. 14 is a cross-sectional view taken on plane B-B in FIG. 13;
  • FIG. 15 is a view showing the ideal orientation of glass fibers in a guide.
  • FIG. 16 a cross-sectional view taken on plane B-B in FIG. 13 illustrating a case in which a glass fiber reinforcing resin was used.
  • a transmission for valve timing in a motor vehicle engine, transmits power by means of a chain C, which travels around a driving sprocket S 1 and driven sprockets S 2 in a circulating path.
  • a movable transmission guide 10 guides, and applies tension to, the chain C, as the chain slides on the guide.
  • a fixed guide L along which the chain slides, is also provided.
  • the fixed guide does not have a reinforcing rib portion.
  • the transmission guide comprises a slide rail 11 , having on one side a substantially arc-shaped sliding contact surface on which a chain C slides, and, on its opposite side, a rail supporting member 12 , which extends in perpendicular relationship to the sliding contact surface, along the length of the guide.
  • the rail supporting member 12 includes a boss 12 a having a mounting hole 13 , for pivotally mounting the guide on a wall of an engine block so that it can serve as a movable guide, and portion 12 b for abutting a tensioner T (FIG. 1), in order to apply appropriate tension to the chain C to prevent transmission failure resulting from excessive stretching or loosening of the chain.
  • the guide also has reinforcing rib portions 12 c which serve both a reinforcing and weight-reducing function.
  • the slide rail 11 and rail supporting member 12 are integrally molded as a unit by injection molding.
  • a synthetic resin P is injected through a gate G, provided at one end in the longitudinal direction of the guide.
  • the reinforcing rib portions 12 c extend in an S-shaped configuration, to correspond to the direction of injection of the synthetic resin P. Consequently, the synthetic resin P, injected through the gate G, flows to the reinforcing rib portions 12 c along an auxiliary flow path as shown by arrows D in FIG. 2, so that the resin is injected into the entire guide with a minimum of flow resistance.
  • the resin P does not remain stationary at the reinforcing rib portions 12 c during injection molding, and no eddy flow or turbulent flow occurs. Consequently, the synthetic resin P can be injected smoothly to the end of the guide opposite the gate G. As a result, the synthetic resin P is molecularly oriented when it is solidified.
  • the transmission guide 10 thus obtained has an increased crystal region of injection-molded synthetic resin P, and accordingly, the strength and toughness of the guide are dramatically improved. Further, because the crystal region is increased, thermal shrinkage of the guide is reduced, strains such as warpage, torsion and the like are less likely to occur even in a high temperature transmission environment, and a stable transmission guiding function can be achieved.
  • a sandwich injection molding process may be used to form the transmission guide.
  • a resin P 2 which forms a core layer
  • a sheath composed of a resin P 1 , which forms a skin layer.
  • the core layer is injected into the interior of the reinforcing rib portions 12 c . Since the injection ratio of the core layer forming resin P 2 can be increased, the strength and toughness of the guide can be improved.
  • the core layer resin P 2 consists of a glass fiber reinforced resin
  • the reinforcing glass fibers F are uniformly dispersed in the resin and oriented in the injection direction (the direction of the normal to the a cross section in FIG. 4). With the use of glass fibers, the strength and toughness of the guide can be further enhanced.
  • the transmission guide 10 can be produced by a conventional injection molding apparatus, except that the mold is shaped so that the reinforcing ribs follow the direction of injection of the synthetic resin P during injection molding.
  • the synthetic resins P, used for the transmission guide 10 are not particularly limited, and any one of the synthetic resins, which have been used in the injection molding, such as nylon 6 , nylon 66 , nylon 46 , all aromatic nylons and the like, may be used.
  • reinforcing ribs 12 c in the above example are in the form of an S-shaped curve substantially following the injection direction of the synthetic resin P, the reinforcing ribs can be arranged in various other forms, as shown in FIGS. 5 to 12 .
  • a plurality of reinforcing ribs 12 c are disposed in a radiating pattern which begins at the slide rail, which is at the outer end of the radiating pattern.
  • the radiating ribs extend along the direction of flow of the synthetic resin P.
  • a plurality of reinforcing ribs 12 c extend in a vein-shaped arrangement. These ribs extend outwardly from a central rib which extends longitudinally in a direction substantially parallel to the slide rail.
  • the synthetic resin P can be injected uniformly into the entire guide, since the flow of resin follows the directions of the ribs during injection molding. In these embodiments, the bending strength and toughness of the guide are further enhanced.
  • reinforcing ribs 12 c are disposed in a honeycomb-shaped arrangement or a number sign- or pound sign-shaped arrangement.
  • the flow of resin during injection molding follows the directions of the ribs, and the strength of the guide is enhanced.
  • the reinforcing ribs of a slide rail supporting member extend in a direction such that the flow of synthetic resin P during injection molding follows the longitudinal directions of the ribs.
  • the resin is molecularly oriented when it is solidified in such a way that the strength and toughness of the guide are dramatically improved.
  • the crystal region of the resin injected into the guide is increased so that thermal shrinkage of the guide is decreased, and warpage, torsion and the like are reduced, even in a high temperature environment, and a stable guiding function is achieved.
  • the injection pressure and injection time are also reduced, and a the production cost of the guide can be significantly reduced.
  • the synthetic resin is a glass fiber-reinforcing resin
  • the orientation of the glass fibers F in the longitudinal direction of reinforcing ribs can be enhanced significantly, and a more uniform dispersion of the reinforcing glass fibers can be achieved.
  • the strength of the guide can be significantly increased.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Transmission Devices (AREA)
US10/226,900 2001-09-11 2002-08-23 Synthetic resin guide for transmission device Abandoned US20030050140A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/043,816 US7393487B2 (en) 2001-09-11 2005-01-26 Method of molding synthetic resin guide for transmission device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001275680A JP3398143B2 (ja) 2001-09-11 2001-09-11 伝動装置用合成樹脂ガイド
JP275680/2001 2001-09-11

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/043,816 Division US7393487B2 (en) 2001-09-11 2005-01-26 Method of molding synthetic resin guide for transmission device

Publications (1)

Publication Number Publication Date
US20030050140A1 true US20030050140A1 (en) 2003-03-13

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US10/226,900 Abandoned US20030050140A1 (en) 2001-09-11 2002-08-23 Synthetic resin guide for transmission device
US11/043,816 Expired - Fee Related US7393487B2 (en) 2001-09-11 2005-01-26 Method of molding synthetic resin guide for transmission device

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/043,816 Expired - Fee Related US7393487B2 (en) 2001-09-11 2005-01-26 Method of molding synthetic resin guide for transmission device

Country Status (5)

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US (2) US20030050140A1 (zh)
EP (1) EP1291553B1 (zh)
JP (1) JP3398143B2 (zh)
CN (1) CN1282837C (zh)
DE (1) DE60219563T2 (zh)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040058763A1 (en) * 2002-09-24 2004-03-25 Masahiko Konno Sandwich-molded guide for transmission device
US20060199689A1 (en) * 2005-03-07 2006-09-07 Tsubakimoto Chain Co. Sliding contact guide for transmission
US20110294613A1 (en) * 2009-01-15 2011-12-01 Schaeffler Technologies Gmbh & Co. Kg Tensioning rail for power transmission drives on internal combustion engines
US20140256487A1 (en) * 2013-03-07 2014-09-11 Iwis Motorsysteme Gmbh & Co. Kg Method for producing a tensioning or guide rail with a vibration absorber
WO2015095042A1 (en) * 2013-12-16 2015-06-25 Borgwarner Inc. Composite tensioner arm or guide for timing drive application
US20180245673A1 (en) * 2017-02-24 2018-08-30 Tsubakimoto Chain Co. Chain guide
DE102014204046B4 (de) 2013-03-12 2019-12-19 Tsubakimoto Chain Co. Kettenführung
US20200124142A1 (en) * 2018-10-22 2020-04-23 Ford Global Technologies, Llc Methods and systems for a heatable tensioning arm

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3587835B2 (ja) * 2002-09-25 2004-11-10 株式会社椿本チエイン サンドイッチ成形による伝動装置用可動ガイド
JP3587836B2 (ja) 2002-09-25 2004-11-10 株式会社椿本チエイン テンショナレバー
JP4115919B2 (ja) * 2003-10-30 2008-07-09 株式会社椿本チエイン 伝動装置用ガイド
JP3962060B2 (ja) * 2005-01-19 2007-08-22 株式会社椿本チエイン 伝動装置用ガイド
EP1746306A1 (en) 2005-07-20 2007-01-24 DSM IP Assets B.V. Guide for transmission device
JP4248544B2 (ja) * 2005-12-19 2009-04-02 株式会社椿本チエイン 伝動装置用可動ガイド
JP5369460B2 (ja) * 2007-07-20 2013-12-18 セイコーエプソン株式会社 樹脂成形品、原稿カバーおよびこれらを備えたスキャナ装置、記録装置
JP4386378B2 (ja) * 2007-07-31 2009-12-16 株式会社椿本チエイン テンショナレバー
JP2009103186A (ja) * 2007-10-22 2009-05-14 Tsubakimoto Chain Co 伝動装置用ガイド
DE102011006306A1 (de) 2011-03-29 2012-10-04 Bayerische Motoren Werke Aktiengesellschaft Führungsbauteil aus Kunststoff zum Führen einer Endloskette eines Kettentriebs
JP6161689B2 (ja) * 2013-04-18 2017-07-12 株式会社エンプラス 繊維強化樹脂歯車
JP2014211195A (ja) * 2013-04-18 2014-11-13 Nok株式会社 チェーン位置決め部材の成形方法
CN103758983B (zh) * 2014-01-29 2016-08-17 上海云逸民用航空科技有限公司 传动装置
JP2014139482A (ja) * 2014-04-22 2014-07-31 Ntn Corp チェーンガイド
DE102017108897A1 (de) 2017-04-26 2018-10-31 Schaeffler Technologies AG & Co. KG Führungsschiene für einen Zugmitteltrieb
CN113195913B (zh) * 2018-12-12 2023-02-21 美津浓科技股份有限公司 滑轨单元及滑轨单元的制造方法

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040058763A1 (en) * 2002-09-24 2004-03-25 Masahiko Konno Sandwich-molded guide for transmission device
US20060199689A1 (en) * 2005-03-07 2006-09-07 Tsubakimoto Chain Co. Sliding contact guide for transmission
US20110294613A1 (en) * 2009-01-15 2011-12-01 Schaeffler Technologies Gmbh & Co. Kg Tensioning rail for power transmission drives on internal combustion engines
US8690717B2 (en) * 2009-01-15 2014-04-08 Schaeffler Technologies AG & Co. KG Tensioning rail for power transmission drives on internal combustion engines
US20140256487A1 (en) * 2013-03-07 2014-09-11 Iwis Motorsysteme Gmbh & Co. Kg Method for producing a tensioning or guide rail with a vibration absorber
US9394978B2 (en) * 2013-03-07 2016-07-19 Iwis Motorsysteme Gmbh & Co. Kg Method for producing a tensioning or guide rail with a vibration absorber
DE102014204046B4 (de) 2013-03-12 2019-12-19 Tsubakimoto Chain Co. Kettenführung
WO2015095042A1 (en) * 2013-12-16 2015-06-25 Borgwarner Inc. Composite tensioner arm or guide for timing drive application
US20180245673A1 (en) * 2017-02-24 2018-08-30 Tsubakimoto Chain Co. Chain guide
US10753437B2 (en) * 2017-02-24 2020-08-25 Tsubakimoto Chain Co. Chain guide
US20200124142A1 (en) * 2018-10-22 2020-04-23 Ford Global Technologies, Llc Methods and systems for a heatable tensioning arm
US11674568B2 (en) * 2018-10-22 2023-06-13 Ford Global Technologies, Llc Methods and systems for a heatable tensioning arm

Also Published As

Publication number Publication date
CN1407257A (zh) 2003-04-02
DE60219563T2 (de) 2007-12-27
EP1291553B1 (en) 2007-04-18
CN1282837C (zh) 2006-11-01
JP2003083403A (ja) 2003-03-19
JP3398143B2 (ja) 2003-04-21
US7393487B2 (en) 2008-07-01
EP1291553A3 (en) 2004-11-10
US20050200044A1 (en) 2005-09-15
EP1291553A2 (en) 2003-03-12
DE60219563D1 (de) 2007-05-31

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AS Assignment

Owner name: TSUBAKIMOTO CHAIN CO., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KONNO, MASAHIKO;REEL/FRAME:013364/0467

Effective date: 20020821

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION