WO2014183752A1 - Joint tournant à douille imperdable d'un rail tendeur ou de guidage, et dispositif de transmission par lien souple - Google Patents

Joint tournant à douille imperdable d'un rail tendeur ou de guidage, et dispositif de transmission par lien souple Download PDF

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Publication number
WO2014183752A1
WO2014183752A1 PCT/DE2014/200102 DE2014200102W WO2014183752A1 WO 2014183752 A1 WO2014183752 A1 WO 2014183752A1 DE 2014200102 W DE2014200102 W DE 2014200102W WO 2014183752 A1 WO2014183752 A1 WO 2014183752A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
guide rail
clamping
hole
bearing surface
Prior art date
Application number
PCT/DE2014/200102
Other languages
German (de)
English (en)
Inventor
Michael Kastner
Original Assignee
Schaeffler Technologies Gmbh & Co. Kg
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 Schaeffler Technologies Gmbh & Co. Kg filed Critical Schaeffler Technologies Gmbh & Co. Kg
Publication of WO2014183752A1 publication Critical patent/WO2014183752A1/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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of 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
    • F16H2007/0802—Actuators for final output members
    • F16H2007/081—Torsion springs
    • 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
    • F16H2007/0842—Mounting or support of tensioner
    • 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
    • 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
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0893—Circular path

Definitions

  • the invention relates to a bolt and a sleeve of a clamping or guide rail, for use in a traction mechanism drive of an internal combustion engine.
  • the bolt according to the invention is designed with a screw head, which adjoins a shaft having a threaded portion, and the screw head is adapted to rest on the outside of the clamping or guide rail, and further on the outside of the shaft, a circumferential groove having a first diameter is present which borders on each side on each shoulder, which has a first diameter larger second diameter.
  • Such a bolt can also be referred to as a bolt screw.
  • the bolt can also be designed hollow and then act as a sleeve. It can be another fastener, such as a screw pushed through the then sleeve-like pin design.
  • the sleeve-like bolt design may also have a threaded portion.
  • An inventive sleeve of the clamping or guide rail then serves to receive a, the clamping or guide rail to another component fastened screw, wherein the sleeve in a hole of the clamping or guide rail can be inserted and in the operating state over at least part of its peripheral surface on the Inner surface of the hole of the clamping or guide rail rests.
  • the state of operation of the sleeve and of the tension or guide rail is understood to be the state which prevails during the use of the sleeve in an exciting or guiding rail, that is to say the state in which the sleeve is inserted into the rail. is inserted and the rail is rotatably mounted on a motor block-fixed component so that the rail acts exciting and / or leading to a traction means.
  • a guide or tensioning rail for a traction means is disclosed, with an elongate carrier body and a sliding coating, wherein the sliding coating at a first end has a wrap which positively surrounds a first end of the carrier body in the longitudinal direction, and the carrier body two laterally formed guide rims for guiding the traction means, on which the sliding lining is fastened in a form-fitting manner in the region of a second end of the carrier body, wherein the guide rims each have an opening and the sliding lining at a second end has longitudinally arranged projections which are latched in the openings of the guide rims.
  • EP 1 585 912 B1 discloses a structural unit with a sleeve for a chain drive.
  • This sleeve is designed as a metallic sleeve and used in a plastic support body, which support body is used in clamping or guide rails of a chain drive use.
  • a screw is pushed through the sleeve and screwed to a solid component, such as the motor housing.
  • a solid component such as the motor housing.
  • To attach the screw is tightened so that the sleeve comes into contact with the motor housing and finally secured against rotation in the attached state of the clamping or guide rail on the motor housing.
  • the clamping or guide rail is then held against rotation in this attached state.
  • sleeves are suitable only for the purpose of securing the clamping or guide rail. In practice has shown, however, that it can come between the inserted mounting sleeves and the clamping or guide rail made of plastic due to the material compression in the plastic during operation, after some operating time to a game between sleeve and guide rail, thereby providing the necessary clamping force Rail is lost.
  • Such fastening members are thus to be optimized for use on tensioning or guide rails in a chain drive or belt drive system on internal combustion engines.
  • a secure sleeve connection while enabling a rotary joint in the context of storage for a corresponding assembly is realized.
  • the bearing surface is optimized for precise guiding of the component, so that low friction between the sleeve and the clamping or guide rail occurs.
  • the sleeve can be designed so that it has at least one annular bearing surface and a recess, which hereinafter also referred to as an undercut is.
  • the undercut is designed as a groove, that the sleeve snapped with the mating contour in the rail, or can be pressed.
  • the existing plastic counter contour of the rail can be configured adapted. In the motor-mounted state, the clamping or guide rail can be supported on the bearing surface and rotate about it.
  • a protrusion which recess is geometrically matched to the survey that in the operating state of the sleeve, the collection of the side edges of the recess is axially spaced.
  • the width of the recess is according to another advantageous embodiment to be determined such that the side edges of the survey are spaced from the side edges of the recess at the occurring during operation temperature-related geometry fluctuations of the sleeve and the clamping or guide rail by a minimum distance from each other.
  • the survey in the operating state of the clamping or guide rail in the recess of the sleeve extending substantially parallel to the recess running, so a captive can be provided which around the entire circumference of the inner surface of the clamping or Guide rail runs around and around the entire circumference as effective captive protection works. Also, the captive then acts independently of the rotational position of the sleeve to a clamping or guide rail in the attached state.
  • a further advantageous embodiment is achieved in that the recess is designed as a groove which extends in the circumferential direction of the sleeve, to which groove adjacent at least a portion of the bearing surface extends.
  • the recess is designed as a groove which extends in the circumferential direction of the sleeve, to which groove adjacent at least a portion of the bearing surface extends.
  • the size of the bearing surface can additionally be designed as desired and optimally adapted to the prevailing force relationships in the contact area between sleeve and clamping or guide rail.
  • the contact surface can be adjusted to the maximum permissible values for surface pressure and frictional forces.
  • the depression extends around the entire circumference of the sleeve, thereby dividing the bearing surface into two partial bearing surfaces, which are located on both sides of the depression.
  • a captive can be provided, which acts uniformly around the entire circumference around and can secure the sleeve all around before losing.
  • the bearing surface of the sleeve extends over a majority of the entire peripheral surface, preferably at least over 70% of the peripheral surface. If this is the case, then the sleeve is used optimally over its length as a storage area and the storage area is optimized.
  • the plastic used for the tension or guide rail used is usually due to the lower area Less stressed by the harder, usually made of metal sleeve and worn out.
  • the bearing surface has a constant diameter over the length of the sleeve.
  • Such a sleeve is particularly inexpensive to manufacture.
  • the sleeve has at least one first shoulder at one end, which adjoins the bearing surface of the sleeve and has an outer diameter which is greater than a first diameter of the bearing surface, a defined stop can easily be achieved be ensured between the sleeve and clamping or guide rail in the axial direction. This facilitates in particular the assembly effort, since the sleeve can be inserted only as far as the stop in the clamping or guide rail, without any special care must be taken to the insertion depth of the sleeve.
  • the clamping or guide rail on the inner surface of its hole which has at least one elevation which extends in the circumferential direction of the inner surface.
  • the survey which is molded for example in one part to the inner surface of the clamping or guide rail or preferably made of the same material and is already formed during the casting process, represents a snap connection that is easy to implement.
  • the sleeve can be inserted into the hole of the clamping - Or guide rail are snapped by applying a slight pressure in the clamping or guide rail.
  • the sleeve can also be developed as a bolt, as a hollow bolt. It is advantageous if the bolt of a clamping or guide rail has a screw head, which connects to a threaded portion having a shaft, and the screw head is designed to rest on the outside of the clamping or guide rail, and also on the outside of the shaft a circumferential groove having a first diameter is provided which adjoins a shoulder on each side, which has a second diameter larger second diameter, wherein a peripheral surface of at least one of the paragraphs as a bearing surface for contacting with the clamping or guide rail is.
  • the circumferential surfaces of both shoulders are designed as bearing surfaces which can be brought into contact with the tensioning or guide rail.
  • a shoulder is formed by the screw head or offset in the direction of the threaded portion, preferably formed separately from the screw head.
  • the combination of the two paragraphs with interposed groove between the preferably end befindlichem threaded portion and the screw head is arranged.
  • the axial length of the groove is 1, 2 times to 0.8 times as long as the axial length of the threaded portion, preferably exactly as long as the threaded portion.
  • the bearing surface is flow-pressed and / or sanded and / or turned.
  • a clamping or guide rail is designed with a through hole into which the bolt is inserted.
  • a single inwardly extending, the fürgangsloch bemesser decreasing increase by the material of the clamping or guide rail can be formed in the through hole of the clamping or guide rail.
  • the over the entire inner circumference of the through hole encircling increase or only partially distributed over the inner circumference of the through hole existing increase may have a triangular cross-section.
  • a traction mechanism with a traction means such as a chain or a belt, is present, which is passed over a tension or guide rail.
  • the invention also relates to a clamping or guide rail, in which at least one sleeve according to the invention is inserted.
  • the bearing surface of the sleeve is then mounted via a press fit in the hole of the clamping or guide rail.
  • the invention also relates to a traction mechanism drive with a traction means, such as a chain or a belt, which includes a sleeve according to the invention or a tensioning or guiding rail according to the invention.
  • a traction means such as a chain or a belt
  • FIG. 1 shows a first embodiment of a clamping or guide rail with an inserted, inventive bolt in a perspective view, wherein a spring is installed on the clamping or guide rail,
  • FIG. 2 is a view of the embodiment of FIG. 1 from the other side
  • 3 shows a second embodiment of a clamping or guide rail with inserted, inventive bolt in a perspective view
  • FIG. 4 shows the embodiment of FIG. 3 in a rotated representation from the other side
  • FIG. 5 shows a representation of the bolt used in the two embodiments of the tension or guide rail of FIGS. 1 to 4,
  • FIG. 6 is a perspective view of a bolt of FIG. 5,
  • FIG. 7 shows a longitudinal section through the tensioning or guide rail of FIGS. 1 and 2 in the region of a through-hole into which the bolt of FIGS. 5 and 6 is to be inserted, FIG.
  • FIG. 8 shows a further embodiment of the bolt according to the invention, which is designed here as a sleeve, in isometric view,
  • FIG. 9 is a sectional view of the sleeve according to the invention shown in Figure 8 in a plugged in the clamping or guide rail state, wherein the sleeve is cut in the longitudinal direction, and
  • Fig. 10 is a detailed view of the contact area of the sleeve and clamping or guide rail in the area, introduced into the sleeve groove and formed by the survey on the inner hole surface of the clamping or guide rail captive.
  • an inventive bolt 1 is shown in a first embodiment, as it is inserted into a clamping or guide rail 2 according to the invention. It is already a spring 3 attached to the clamping or guide rail 2 and surrounds a fastening region 4 of the clamping or guide rail 2, through which a through hole 5 extends.
  • the through hole 5 can be seen particularly well in FIG.
  • the three components, bolts 1, clamping or guide rail 2 and spring 3 form a kit 6.
  • the bolt 1 extends completely through the through hole 5 of the clamping or guide rail 2, in such a way that a screw head 7 is located on one side of the clamping or guide rail 2 and a Thread portion 8 is located on the other side of the clamping or guide rail 2.
  • an additional recess 9 in the clamping or guide rail 2 is provided, wherein the recess 9 may also be formed as a projection, or on the one side of the clamping or Guide rail 2 a recess and on the other side of the clamping or guide rail 2, a projection is present.
  • a groove 12 located between the screw head 7 and the threaded portion 8, between a first paragraph 10 and a second paragraph 1 1, a groove 12.
  • the first paragraph 10 and the second paragraph 1 1 have at its periphery or lateral surfaces on first and second bearing surfaces 13 and 14.
  • the groove 12 has a diameter which is smaller than the diameter in the region of the first shoulder 10 and also in the region of the second shoulder 11.
  • the groove 12 thus forms an undercut, which acts as a captive in interaction with the clamping or guide rail 2.
  • a receptacle 15 may be provided for a tool, such as an Allen wrench.
  • a single circumferential elevation 16 is present, which has in this longitudinal sectional view along a rotation axis 17, a triangular shape with a preferably flattened surface.
  • the tension or guide rail 2 is made of plastic and the elevation 16 is an integral part of it. With the bearing surfaces cooperating bearing counter surfaces 18 are on both sides of the increase 16 available.
  • the subject invention also includes an embodiment of the bolt 1 as a hollow bolt, hereinafter referred to as sleeve 19.
  • sleeve 19 is inserted in the same manner as the bolt in the same clamping or guide rail 2.
  • the clamping or guide rail 2 shown at least in sections in FIGS. 9 and 10, thus corresponds in its design to the tensioning or guide rail described above and has largely the same geometric configuration. The same applies to the spring 3 and its connection on the part of the clamping or guide rail. 2
  • the tension or guide rail 2 into which the sleeve 19 is inserted in the assembled state has an inner surface 20.
  • This inner surface 20 contacts the peripheral surface 21 of the sleeve
  • the peripheral surface 20 is inserted into the through hole 5 of the clamping or guide rail 2 and is turned off so that its major part is in contact with the inner surface 20 of the clamping or guide rail 2.
  • This, in contact circumferential surface 21 forms a bearing surface on which the inner surface 20 is supported and supported and therefore slides relative to the clamping or guide rail 2 during rotation of the sleeve 19.
  • the representation of an additional screw required for the fastening has been dispensed with.
  • a screw is inserted in the sleeve 19 in the fastened state and screwed into a combustion engine-side component, such as the motor housing, by means of a fastened out of the sleeve 19 threaded portion.
  • the sleeve is then fully inserted in the attached state in the through hole 5 and is at both ends of this through hole 5 to a certain extent from the Through hole 5 addition, so that the clamping or guide rail 2 in the attached state out of contact with the internal combustion engine side component and a screw head of the screw.
  • the sleeve 19 is mounted rotatably relative to the clamping or guide rail 2 in the attached state of the clamping or guide sleeve 2 and ensures that the clamping or guide rail 2 about the longitudinal axis 22 of the sleeve 19 remains rotatable.
  • the bearing surface over its entire length away a constant, first diameter.
  • the bearing surface is interrupted by a depression, in this case a groove 23, and spatially divided into two partial surfaces, a first bearing surface 24 and a second bearing surface 25, which bearing surfaces 24 and 25 are preferably annular are.
  • the bottom of the groove 23 has a second diameter which is smaller than the first diameter of the annular bearing surfaces 24 and 25.
  • the groove 23 is inserted around the entire circumference of the sleeve 23 in the outside of the sleeve 19 and extends in the circumferential direction of the sleeve 19.
  • the bearing surface which consists of first and second bearing surface 24 and 25, in their length, along the longitudinal axis 5, the majority of the entire circumferential surface 21 of the sleeve 19 a.
  • the length of the first and second bearing surfaces 24 and 25 is in relation to the total length of the peripheral surface 21 of the sleeve 19, that is, the surface which represents the surface projected to the outside of the sleeve 19, at least 70%, preferably at least 75%, particularly preferred at least 80%, more preferably at least 85% and more preferably at least 90%.
  • the groove 23 has a width that is matched to the possible geometry fluctuations in sleeve 19 and clamping or guide rail 2.
  • In the cavity 27 formed by the groove 23 between tensioning or guide rail 2 and sleeve 19 is an integrally formed on the inner surface 20 of the through hole 5 of the clamping or guide rail 2 increase 28, hereinafter also referred to as survey 28 arranged.
  • This survey 28 corresponds in its design and connection to the clamping or guide rail. 2 the increase 16, which increase 16 has already been described in the exemplary embodiment of the bolt.
  • the substantially triangular elevation 28 is located in the initial state substantially centrally in the groove 23.
  • the side flanks 29 and 30 of the groove 23 facing side edges 31 and 32 of the elevation 28 have substantially the same Distance.
  • the groove 23 of the sleeve 19 shifts over a substantial distance relative to the elevation 28 of the clamping or guide rail 2.
  • the sleeve 19 contracts in the longitudinal direction and the elevation 28 is moved relative to the groove 23 further to the second, the right side edge 30 of the groove 23 out.
  • the sleeve 19 expands, compared to the initial state, by a certain proportion in the longitudinal direction and the elevation 28 moves closer to the other, the first side flank 29 of the groove 23 out.
  • the width of the groove 23 is set so that it does not come to a contact between the side edges 31 and 32 of the survey 28 and the side edges 29 and 30 of the groove 23 despite this occurring during operation temperature fluctuations.
  • the side edges 31 and 32 of the survey 28th from the opposite side edges 29 and 30 of the groove 23 always at least a minimum distance.
  • This minimum distance is preferably at least 0.1 mm, preferably at least 0.2 mm, particularly preferably at least 0.5 mm.
  • the bearing surface is designed as large as possible, so that a maximum contact surface between clamping or guide rail 2 and sleeve peripheral surface 21 is provided and on the other hand, the captive ensured by the survey 28 and the groove 23 even at high temperature fluctuations.
  • a loss-secured sleeve 19 is provided, the thermal expansion but also compensates for other tolerances of other component. Unhindered by the captive can therefore support the clamping or guide rail on the bearing surfaces of the sleeve 19 and rotate about this.
  • the cylindrically shaped sleeve 19 furthermore points toward one end of the sleeve 19, preferably on the bearing surfaces 24 and 25, a shoulder 26. In the illustrated embodiment, it is the first bearing surface 24 to which the shoulder 26 adjoins, the shoulder 26 having a larger diameter than the first diameter of the two bearing surfaces 24 and 25.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)

Abstract

L'invention concerne une douille (18) d'un rail tendeur ou de guidage (2) destiné à recevoir une vis fixant la douille (19) sur un autre élément. La douille (18) peut être introduite dans un trou (5) du rail tendeur ou de guidage (2) et, dans l'état de fonctionnement, repose sur la surface intérieure (20) du trou (5) du rail tendeur ou de guidage (2) sur au moins une partie de sa surface périphérique (21). Dans l'état de fonctionnement de la douille (18), la partie de la surface périphérique (21) de la douille (19) reposant sur le trou (5) du rail tendeur ou de guidage (2) est réalisée sous la forme d'une surface d'appui, surface d'appui vers laquelle la surface intérieure (20) du trou (5), dans l'état de fonctionnement, est mobile par rapport au rail tendeur ou de guidage (2).
PCT/DE2014/200102 2013-05-15 2014-03-03 Joint tournant à douille imperdable d'un rail tendeur ou de guidage, et dispositif de transmission par lien souple WO2014183752A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013209035.8 2013-05-15
DE201310209035 DE102013209035A1 (de) 2013-05-15 2013-05-15 Verliergesicherte Hülsendrehverbindung einer Spann- oder Führungsschiene, sowie Zugmitteltrieb

Publications (1)

Publication Number Publication Date
WO2014183752A1 true WO2014183752A1 (fr) 2014-11-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2014/200102 WO2014183752A1 (fr) 2013-05-15 2014-03-03 Joint tournant à douille imperdable d'un rail tendeur ou de guidage, et dispositif de transmission par lien souple

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Country Link
DE (1) DE102013209035A1 (fr)
WO (1) WO2014183752A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220221030A1 (en) * 2021-01-12 2022-07-14 Tsubakimoto Chain Co. Chain guide
US11555533B2 (en) * 2020-05-25 2023-01-17 Tsubakimoto Chain Co. Chain guide

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032806A (en) 1976-02-02 1977-06-28 The Singer Company Battery powered power tools
WO2004067999A1 (fr) * 2003-01-25 2004-08-12 Ina-Schaeffler Kg Unite modulaire munie d'un manchon pour transmission par chaine
DE202006007821U1 (de) * 2006-05-16 2007-09-20 JOH. WINKLHOFER & SÖHNE GMBH & Co. KG Spann- oder Führungsschiene mit Verliersicherung für Haltebolzen
WO2009089265A2 (fr) * 2008-01-08 2009-07-16 Cloyes Gear And Products, Inc. Organe de fixation captif pour guide-chaîne ou bras tendeur
DE102009057328A1 (de) 2009-12-07 2011-06-09 Schaeffler Technologies Gmbh & Co. Kg Spann- oder Führungsschiene

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032806A (en) 1976-02-02 1977-06-28 The Singer Company Battery powered power tools
WO2004067999A1 (fr) * 2003-01-25 2004-08-12 Ina-Schaeffler Kg Unite modulaire munie d'un manchon pour transmission par chaine
EP1585912B1 (fr) 2003-01-25 2007-07-25 Schaeffler KG Unite modulaire munie d'un manchon pour transmission par chaine
DE202006007821U1 (de) * 2006-05-16 2007-09-20 JOH. WINKLHOFER & SÖHNE GMBH & Co. KG Spann- oder Führungsschiene mit Verliersicherung für Haltebolzen
WO2009089265A2 (fr) * 2008-01-08 2009-07-16 Cloyes Gear And Products, Inc. Organe de fixation captif pour guide-chaîne ou bras tendeur
DE102009057328A1 (de) 2009-12-07 2011-06-09 Schaeffler Technologies Gmbh & Co. Kg Spann- oder Führungsschiene

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11555533B2 (en) * 2020-05-25 2023-01-17 Tsubakimoto Chain Co. Chain guide
US20220221030A1 (en) * 2021-01-12 2022-07-14 Tsubakimoto Chain Co. Chain guide
US11662000B2 (en) * 2021-01-12 2023-05-30 Tsubakimoto Chain Co. Chain guide

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