EP1315912A1 - Deflection pulley for a traction mechanism drive - Google Patents

Deflection pulley for a traction mechanism drive

Info

Publication number
EP1315912A1
EP1315912A1 EP01957966A EP01957966A EP1315912A1 EP 1315912 A1 EP1315912 A1 EP 1315912A1 EP 01957966 A EP01957966 A EP 01957966A EP 01957966 A EP01957966 A EP 01957966A EP 1315912 A1 EP1315912 A1 EP 1315912A1
Authority
EP
European Patent Office
Prior art keywords
spacer sleeve
fastening screw
screw
deflection roller
projections
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.)
Withdrawn
Application number
EP01957966A
Other languages
German (de)
French (fr)
Inventor
Johann Singer
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.)
IHO Holding GmbH and Co KG
Original Assignee
INA Schaeffler 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 INA Schaeffler KG filed Critical INA Schaeffler KG
Publication of EP1315912A1 publication Critical patent/EP1315912A1/en
Withdrawn legal-status Critical Current

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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/04—Preventing damage to bearings during storage or transport thereof or when otherwise out of use
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/006—Guiding rollers, wheels or the like, formed by or on the outer element of a single bearing or bearing unit, e.g. two adjacent bearings, whose ratio of length to diameter is generally less than one
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/073—Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
    • 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
    • F16H7/20—Mountings for rollers or pulleys
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
    • F16B41/002—Measures against loss of bolts, nuts or pins
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/63—Gears with belts and pulleys
    • 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
    • F16H57/00—General details of gearing
    • F16H2057/0093—Means or measures for transport, shipping or packaging
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—Pulleys
    • 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
    • F16H57/00—General details of gearing

Definitions

  • the invention relates to a deflection roller with which a traction means, in particular a V-ribbed belt or a toothed belt of a traction mechanism drive, is deflected.
  • the deflection roller comprises a roller bearing with a rotationally fixed inner ring and a rotating outer ring.
  • the outer ring is enclosed by an annular body forming a barrel jacket, on the jacket surface of which the traction means is guided.
  • Holding means or fastening means form a structural unit together with the deflection roller by means of a transport lock.
  • a deflection roller consisting of a deep groove ball bearing, which is enclosed on the outside by a molded plastic barrel sleeve.
  • holding means consisting of a sealing washer and a screw, the guide projection of which is inserted in the inner ring of the deflection roller bearing.
  • the outer circumference of the sealing washer also forms a seal for the rolling bearing.
  • a cup-shaped embossing is provided in the center of the sealing washer, the cylindrical portion of which is pressed into the bore of the inner bearing ring.
  • the central hole in the sealing washer is used to hold the guide shoulder of the locking screw.
  • the screw head is supported on the inner ring on the end face with the interposition of the sealing washer.
  • a guide attachment adjoining the screw head serves to center the screw in the inner race of the rolling bearing.
  • the sealing washer is to be connected to the Provided with circumferentially distributed, resilient tongues that are axially / radially inclined to the shaft of the locking screw.
  • This transport lock thus comprises a sealing washer with a complicated shape, which causes both high manufacturing costs and cost-intensive assembly.
  • This object is achieved according to the invention in that in a spacer sleeve assigned to the deflecting roller, a through hole for receiving the fastening screw is provided with at least one inward radial projection, which secures the fastening screw in a force-locking manner.
  • This transport lock according to the invention requires no additional component in comparison to the known prior art and can be implemented inexpensively by means of a simple material forming. In addition, the transport lock according to the invention has no adverse influence on the assembly.
  • the transport lock according to the invention also ensures, by means of a corresponding design of the radial projection or a plurality of radial projections, that the fastening screw in the spacer sleeve is positioned in the deflection roller in accordance with the installation position. This measure simplifies the assembly of the entire deflecting roller and at the same time enables assembly of the deflecting roller in accordance with the machine because of the precompleted arrangement of the fastening screw, including all holding means.
  • the spacer sleeve provides for the spacer sleeve to be provided with radial projections arranged symmetrically around the circumference. This measure improves the central arrangement of the fastening screw in the spacer sleeve.
  • the invention includes a spacer sleeve, the radial projections of which are guided up to the outer surface of the screw shaft in order to achieve a positive connection. A play-free arrangement of the fastening screw in the spacer sleeve can thus be ensured, combined with an exact alignment of the fastening screw with respect to the spacer sleeve.
  • the non-positive transport lock also ensures an improved position fixation of all holding means during transport and assembly of the entire assembly.
  • Adequate cohesion of all holding means of the deflection roller is thus ensured without additional components.
  • the slightly increased tightening torque of the fastening screw due to the radial pressure by the projections acting on the screw shank can be compensated or corrected if necessary by a correspondingly increased tightening torque of the fastening screw.
  • the arrangement of the spacer sleeve and the fastening screw is provided such that the screw head of the fastening screw and the spacer sleeve are supported on opposite end faces of the inner race of the rolling bearing.
  • the fastening screw is centered both by the guide lug fitted in the inner ring of the rolling bearing and on the projections of the spacer sleeve via the screw lug, whereby the installation position of the fastening screw is defined at the same time.
  • Another advantageous embodiment of the invention provides for the radial projections to be arranged in a recess which is axially offset from the end face of the spacer sleeve. This position avoids an influence of the radial projections on the end support surface of the spacer sleeve, for example on a tensioning arm or on a contact surface of the internal combustion engine.
  • a further embodiment of the invention provides for a spacer sleeve designed as a casting to be designed in such a way that it is already provided with radial projections as a blank.
  • a completely cast spacer sleeve saves a work step with which the projections can be cantilever molding.
  • Fastening screws are used in such spacer sleeves, the screw shaft diameter of which exceeds the diameter in the region of the threaded section.
  • the radial projections preferably have a semicircular cross-sectional shape. This shape is achieved through the use of appropriate tools with which material is formed on the end face of the spacer sleeve in the area of the central bore.
  • the invention also includes alternative projections with a different geometric shape. The position of the radial projections enables them to be introduced into the spacer sleeve after the fastening screw has been installed, for example by means of a center punch or another tool.
  • the spacer sleeve according to the invention is preferably made of aluminum or an aluminum alloy. Alternatively, a steel spacer sleeve can also be used, whereby both a cutting and a non-cutting manufacturing process can be provided.
  • FIG. 1 shows in a longitudinal section a deflection roller in which the transport lock according to the invention is integrated
  • FIG. 2 shows an enlarged illustration of the detail “z” according to FIG. 1.
  • the deflection roller 1 shown in FIG. 1 comprises a roller bearing 2 designed as a deep groove ball bearing, the outer ring 3 of which is made of a plastic posed ring body 4 is enclosed.
  • a traction means 6, designed as a V-ribbed belt, is guided on a lateral surface 5 of the ring body 4.
  • An inner ring 7 of the rolling bearing 2 is connected to holding means, consisting of a fastening screw 8 and a spacer sleeve 9.
  • the fastening screw 8 is supported on the end face of the inner ring 7 by a screw head 10.
  • a guide lug 11 axially upstream of the screw head 10 is fitted into a central bore 12 of the inner ring 7.
  • the spacer sleeve 9 is supported on the end face of the inner ring 7 opposite the screw head 10, the spacer sleeve 9 also being centered in the inner ring 7 with a guide collar 13.
  • the spacer sleeve 9 is provided with a through hole 14 for the fastening screw 8.
  • On the end face 15 facing away from the rolling bearing 2, the spacer sleeve 9 is stepped in the region of the through bore 14 and forms an axially offset recess 16.
  • the spacer sleeve 9 is provided with a plurality of circumferentially distributed projections 18 with projections 18 oriented radially in the direction of the fastening screw 8.
  • projections 18 which are preferably formed by a material deformation, are assigned to a screw shaft 19 of the fastening screw 8 and thereby form a radial overlap with a threaded section 20.
  • the fastening screw 8 forms a screw shaft 19 whose diameter "d" is smaller as the threaded section 20 of the fastening screw 8. This creates a radial overlap, which represents an effective protection against loss of the fastening screw, between the transport lock 17 and the threaded shaft 20.
  • the radial projections 18 provided for the transport lock become in the spacer sleeve 9 after the fastening screw 8 has been installed
  • a spacer sleeve 9 designed as a cast part it is advisable to cast it off with projections 18.
  • the finished spacer sleeve 9 consequently does not require any rework to create the transport lock.
  • FIG. 2 shows the detail “z” in accordance with FIG. 1 in an enlarged representation radial projection 18 up to the screw shaft 19 of the fastening screw 8 and thus forms a frictional connection or a press fit.
  • FIG. 2 also shows a caulking 21 designed as a semicircular recess on the spacer sleeve 9, which forms the projection 18, by means of a local material forming.
  • the radial projection 18 is supported non-positively with a point or line contact on the lateral surface of the fastening screw 8. Due to the material elasticity or the different material strength between the spacer sleeve 9, which is preferably made of aluminum, and the fastening screw 8 made of steel, the projection 18 adjusts to the outer surface of the fastening screw 8 and deforms in the process.
  • the non-positive contact of the radial projections 18 on the screw shaft 19 ensures that all components of the deflection roller 1 are held together securely.
  • This transport lock 17 ensures that all components of the deflection roller 1 are held together even during transport and enables simplified assembly.
  • deflection roller (1) which is assigned to a traction drive, comprising:
  • annular body (4) is enclosed by an annular body (4), on the lateral surface (5) of which a traction means (6) is guided, and
  • Holding means such as a fastening screw (8) inserted into the inner ring (7), which, by means of a transport lock (17), joins the deflection roller (1) together with a spacer sleeve (9) to form a structural unit, characterized in that it serves as a transport lock the spacer sleeve (9) has at least one radially inward projection (18) which secures the fastening screw (8) in a force-locking manner.
  • deflection roller according to claim 1, wherein the spacer sleeve (9) is provided with symmetrically circumferentially arranged radial projections (18).
  • Rolling bearing (2) fitted guide projection (11) is centered.
  • deflection roller according to claim 2 wherein the radial projections (18) non-positively on a lateral surface of a screw shaft (19) of the fastening screw (8).
  • deflection roller according to claim 1, wherein the radial projections (18) in an axially to the end face (15) of the spacer sleeve (9) arranged recess (16) are arranged.
  • deflection roller according to claim 1 wherein the radial projections (18) have a largely semicircular shaped cross-sectional shape.

Abstract

The invention relates to a deflection pulley (1), designed for a traction mechanism drive, which comprises an anti-friction bearing (2) and an annular body (4). A locking screw (8) and a distance bush (9) act as retaining elements. To create a locking element (17) for transportation, the distance bush (9) is provided with at least one projection (18), directed radially inwards, said projection radially overlapping a section of thread (20) of the locking screw (8).

Description

Umlenkrolle für einen Zugmitteltrieb Deflection roller for a traction drive
Gebiet der ErfindungField of the Invention
Die Erfindung bezieht sich auf eine Umlenkrolle, mit der ein Zugmittel, insbesondere ein Keilrippenriemen oder ein Zahnriemen eines Zugmitteltriebs umgelenkt wird. Die Umlenkrolle umfasst ein Wälzlager mit einem drehfixierten Innenring und einem rotierenden Außenring. Dabei ist der Außenring von einem einen Laufmantel bildenden Ringkörper umschlossen, an dessen Mantel- fläche das Zugmittel geführt ist. Haltemittel bzw. Befestigungsmittel bilden mittels einer Transportsicherung gemeinsam mit der Umlenkrolle eine Baueinheit.The invention relates to a deflection roller with which a traction means, in particular a V-ribbed belt or a toothed belt of a traction mechanism drive, is deflected. The deflection roller comprises a roller bearing with a rotationally fixed inner ring and a rotating outer ring. The outer ring is enclosed by an annular body forming a barrel jacket, on the jacket surface of which the traction means is guided. Holding means or fastening means form a structural unit together with the deflection roller by means of a transport lock.
Hintergrund der ErfindungBackground of the Invention
Aus der DE 297 20776 U1 ist eine Umlenkrolle bekannt, bestehend aus einem Rillenkugellager, welches außen von einem aus Kunststoff angeformten Laufmantel umschlossen ist. Zur Befestigung der Umlaufrolle sind Haltemittel vorgesehen, bestehend aus einer Dichtscheibe und einer Schraube, deren Führungsansatz im Wälzlager-Innenring der Umlenkrolle eingesetzt ist. Der äußere Umfang der Dichtscheibe bildet gleichzeitig eine Dichtung für das Wälzlager. Im Zentrum der Dichtscheibe ist eine topfförmige Durchprägung vorgesehen, deren zylindrischer Abschnitt in die Bohrung des Wälzlager-Innenrings einge- presst ist. Die zentrale Bohrung der Dichtscheibe dient zur Aufnahme des Führungsansatzes der Sicherungsschraube. Der Schraubenkopf stützt sich unter Zwischenlage der Dichtscheibe stirnseitig an dem Innenring ab. Ein sich an den Schraubenkopf anschließender Führungsansatz dient zur Zentrierung der Schraube in dem Wälzlager-Innenring. Als Verliersicherung bzw. Transportsicherung des Haltemittels ist die Dichtscheibe im Anschluss an die Durchprä- gung mit umfangsverteilt angeordneten, federnden Zungen versehen, die axial/radial schräg verlaufend an den Schaft der Sicherungsschraube angestellt sind. Diese Transportsicherung umfasst damit eine Dichtscheibe mit einer komplizierten Formgebung, die sowohl hohe Herstellkosten als auch eine kos- tenintensive Montage verursacht.From DE 297 20776 U1, a deflection roller is known, consisting of a deep groove ball bearing, which is enclosed on the outside by a molded plastic barrel sleeve. To fasten the idler roller, holding means are provided, consisting of a sealing washer and a screw, the guide projection of which is inserted in the inner ring of the deflection roller bearing. The outer circumference of the sealing washer also forms a seal for the rolling bearing. A cup-shaped embossing is provided in the center of the sealing washer, the cylindrical portion of which is pressed into the bore of the inner bearing ring. The central hole in the sealing washer is used to hold the guide shoulder of the locking screw. The screw head is supported on the inner ring on the end face with the interposition of the sealing washer. A guide attachment adjoining the screw head serves to center the screw in the inner race of the rolling bearing. As a securing device against loss or transport of the holding device, the sealing washer is to be connected to the Provided with circumferentially distributed, resilient tongues that are axially / radially inclined to the shaft of the locking screw. This transport lock thus comprises a sealing washer with a complicated shape, which causes both high manufacturing costs and cost-intensive assembly.
Zusammenfassung der ErfindungSummary of the invention
Die Nachteile der bekannten Lösung berücksichtigend, ist es Aufgabe der vor- liegenden Erfindung, eine kostenoptimierte, problemlos montierbare Transportsicherung zu schaffen, die gleichzeitig eine wirksame Verliersicherung gewährleistet.Taking into account the disadvantages of the known solution, it is the object of the present invention to create a cost-optimized, easily mountable transport lock which at the same time ensures effective protection against loss.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass in einer der Um- lenkrolle zugeordneten Distanzhülse eine Durchgangsbohrung zur Aufnahme der Befestigungsschraube mit zumindest einem nach innen gerichteten radialen Vorsprung versehen ist, der die Befestigungsschraube kraftschlüssig sichert. Diese erfindungsgemäße Transportsicherung erfordert im Vergleich zum bekannten Stand der Technik kein zusätzliches Bauteil und ist mittels einer einfachen Materialumformung kostengünstig realisierbar. Außerdem nimmt die erfindungsgemäße Transportsicherung keinerlei nachteiligen Einfluss auf die Montage. Die erfindungsgemäße Transportsicherung gewährleistet weiterhin durch eine entsprechende Gestaltung des radialen Vorsprungs bzw. mehrerer radialer Vorsprünge, dass die Befestigungsschraube in der Distanzhülse ent- sprechend der Einbaulage in der Umlenkrolle positioniert ist. Diese Maßnahme vereinfacht die Montage der gesamten Umlenkrolle und ermöglicht gleichzeitig eine automatengerechte Montage der Umlenkrolle aufgrund der vorkomplettierten Anordnung der Befestigungsschraube, einschließlich aller Haltemittel.This object is achieved according to the invention in that in a spacer sleeve assigned to the deflecting roller, a through hole for receiving the fastening screw is provided with at least one inward radial projection, which secures the fastening screw in a force-locking manner. This transport lock according to the invention requires no additional component in comparison to the known prior art and can be implemented inexpensively by means of a simple material forming. In addition, the transport lock according to the invention has no adverse influence on the assembly. The transport lock according to the invention also ensures, by means of a corresponding design of the radial projection or a plurality of radial projections, that the fastening screw in the spacer sleeve is positioned in the deflection roller in accordance with the installation position. This measure simplifies the assembly of the entire deflecting roller and at the same time enables assembly of the deflecting roller in accordance with the machine because of the precompleted arrangement of the fastening screw, including all holding means.
Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, die Distanzhülse mit symmetrisch umfangsverteilt angeordneten radialen Vorsprüngen zu versehen. Diese Maßnahme verbessert die zentrische Anordnung der Befestigungsschraube in der Distanzhülse. Weiterhin schließt die Erfindung eine Distanzhülse ein, deren radiale Vorsprünge zur Erzielung eines Kraftschlusses bis an die Mantelfläche des Schraubenschaftes geführt sind. Damit kann eine spielfreie Anordnung der Befestigungsschraube in der Distanzhülse sichergestellt werden, verbunden mit einer exakten Ausrichtung der Befestigungsschraube gegenüber der Distanzhülse. Die kraftschlüssige Transportsicherung sorgt gleichzeitig für eine verbesserte Lagefixierung aller Haltemittel während des Transports und der Montage der gesamten Baueinheit. Ohne zusätzliche Bauteile ist damit ein ausreichender Zusammenhalt aller Haltemittel der Umlenkrolle gewährleistet. Das gering erhöhte Anziehmoment der Befestigungsschraube aufgrund der punktuell am Schraubenschaft angreifenden radialen Pressung durch die Vorsprünge kann ggf. kompensiert oder korrigiert werden durch ein entsprechend erhöhtes Anziehmoment der Befestigungsschraube.Another advantageous embodiment of the invention provides for the spacer sleeve to be provided with radial projections arranged symmetrically around the circumference. This measure improves the central arrangement of the fastening screw in the spacer sleeve. Furthermore, the invention includes a spacer sleeve, the radial projections of which are guided up to the outer surface of the screw shaft in order to achieve a positive connection. A play-free arrangement of the fastening screw in the spacer sleeve can thus be ensured, combined with an exact alignment of the fastening screw with respect to the spacer sleeve. The non-positive transport lock also ensures an improved position fixation of all holding means during transport and assembly of the entire assembly. Adequate cohesion of all holding means of the deflection roller is thus ensured without additional components. The slightly increased tightening torque of the fastening screw due to the radial pressure by the projections acting on the screw shank can be compensated or corrected if necessary by a correspondingly increased tightening torque of the fastening screw.
Die Anordnung der Distanzhülse und der Befestigungsschraube ist so vorgesehen, dass sich der Schraubenkopf der Befestigungsschraube und die Distanzhülse an gegenüberliegenden Stirnseiten des Wälzlager-Innenrings abstützen. Die Befestigungsschraube ist dabei sowohl durch den im Wälzlager- Innenring eingepaßten Führungsansatz als auch an den Vorsprüngen der Distanzhülse über den Schraubenansatz zentriert, wodurch gleichzeitig die Einbaulage der Befestigungsschraube definiert ist.The arrangement of the spacer sleeve and the fastening screw is provided such that the screw head of the fastening screw and the spacer sleeve are supported on opposite end faces of the inner race of the rolling bearing. The fastening screw is centered both by the guide lug fitted in the inner ring of the rolling bearing and on the projections of the spacer sleeve via the screw lug, whereby the installation position of the fastening screw is defined at the same time.
Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, die radialen Vorsprünge in einer Aussparung anzuordnen, der axial zur Stirnseite der Distanzhülse versetzt ist. Diese Lage vermeidet einen Einfluss der radialen Vorsprünge auf die stirnseitige Abstützfläche der Distanzhülse beispielsweise an einem Spannarm oder an einer Anlagefläche der Brennkraftmaschine.Another advantageous embodiment of the invention provides for the radial projections to be arranged in a recess which is axially offset from the end face of the spacer sleeve. This position avoids an influence of the radial projections on the end support surface of the spacer sleeve, for example on a tensioning arm or on a contact surface of the internal combustion engine.
Eine weitere Ausgestaltung der Erfindung sieht für eine als Gußteil gestaltete Distanzhülse vor, dieses so zu gestalten, dass dieses als Rohling bereits mit radialen Vorsprüngen versehen ist. Eine derartige fertig gegossene Distanzhülse erspart einen Arbeitsschritt, mit dem die Vorsprünge mittels einer Ver- stemmung angeformt werden. In derartig gestaltete Distanzhülsen werden Befestigungsschrauben eingesetzt, deren Schraubenschaftdurchmesser den Durchmesser im Bereich des Gewindeabschnittes übertrifft.A further embodiment of the invention provides for a spacer sleeve designed as a casting to be designed in such a way that it is already provided with radial projections as a blank. Such a completely cast spacer sleeve saves a work step with which the projections can be cantilever molding. Fastening screws are used in such spacer sleeves, the screw shaft diameter of which exceeds the diameter in the region of the threaded section.
Vorzugsweise besitzen die radialen Vorsprünge eine halbrundartige Querschnittsform. Diese Form stellt sich ein durch die Verwendung entsprechender Werkzeuge, mit denen eine Materialumformung stirnseitig an der Distanzhülse im Bereich der zentrischen Bohrung erfolgt. Die Erfindung schließt ebenfalls alternativ gestaltete Vorsprünge ein, mit einer abweichenden geometrischen Form. Die Lage der radialen Vorsprünge ermöglicht, diese nach der Montage der Befestigungsschraube in die Distanzhülse einzubringen, beispielsweise mittels einer Körnerspitze oder eines anderen Werkzeugs.The radial projections preferably have a semicircular cross-sectional shape. This shape is achieved through the use of appropriate tools with which material is formed on the end face of the spacer sleeve in the area of the central bore. The invention also includes alternative projections with a different geometric shape. The position of the radial projections enables them to be introduced into the spacer sleeve after the fastening screw has been installed, for example by means of a center punch or another tool.
Die erfindungsgemäße Distanzhülse ist vorzugsweise aus Aluminium oder ei- ner Aluminiumlegierung hergestellt. Alternativ kann ebenfalls eine Stahldistanzhülse eingesetzt werden, wobei sowohl ein spangebendes als auch ein spanloses Herstellverfahren vorgesehen werden kann.The spacer sleeve according to the invention is preferably made of aluminum or an aluminum alloy. Alternatively, a steel spacer sleeve can also be used, whereby both a cutting and a non-cutting manufacturing process can be provided.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Im Folgenden wird unter Bezugnahme auf die Zeichnungen die Erfindung näher erläutert. Es zeigtThe invention is explained in more detail below with reference to the drawings. It shows
Figur 1 in einem Längsschnitt eine Umlenkrolle, in der die erfin- dungsgemäße Transportsicherung integriert ist;1 shows in a longitudinal section a deflection roller in which the transport lock according to the invention is integrated;
Figur 2 in einer vergrößerten Darstellung das Detail „z" gemäß Figur 1.FIG. 2 shows an enlarged illustration of the detail “z” according to FIG. 1.
Detaillierte Beschreibung der ZeichnungenDetailed description of the drawings
Die in Figur 1 abgebildete Umlenkrolle 1 umfasst ein als Rillenkugellager gestaltetes Wälzlager 2, dessen Außenring 3 von einem aus Kunststoff herge- stellten Ringkörper 4 umschlossen ist. An einer Mantelfläche 5 des Ringkörpers 4 ist ein Zugmittel 6, ausgebildet als Keilrippenriemen, geführt. Ein Innenring 7 des Wälzlagers 2 ist mit Haltemitteln verbunden, bestehend aus einer Befestigungsschraube 8 sowie einer Distanzhülse 9. Die Befestigungsschraube 8 stützt sich über einen Schraubenkopf 10 stirnseitig an dem Innenring 7 ab. Ein axial dem Schraubenkopf 10 vorgelagerter Führungsansatz 11 ist in eine zentrische Bohrung 12 des Innenrings 7 eingepasst. An der vom Schraubenkopf 10 gegenüberliegenden Stirnseite des Innenrings 7 stützt sich die Distanzhülse 9 ab, wobei die Distanzhülse 9 mit einem Führungsbund 13 ebenfalls im Innenring 7 zentriert ist. Die Distanzhülse 9 ist mit einer Durchgangsbohrung 14 für die Befestigungsschraube 8 versehen. An der vom Wälzlager 2 abgewandten Stirnseite 15 ist die Distanzhülse 9 im Bereich der Durchgangsbohrung 14 gestuft und bildet eine axial versetzte Aussparung 16.The deflection roller 1 shown in FIG. 1 comprises a roller bearing 2 designed as a deep groove ball bearing, the outer ring 3 of which is made of a plastic posed ring body 4 is enclosed. A traction means 6, designed as a V-ribbed belt, is guided on a lateral surface 5 of the ring body 4. An inner ring 7 of the rolling bearing 2 is connected to holding means, consisting of a fastening screw 8 and a spacer sleeve 9. The fastening screw 8 is supported on the end face of the inner ring 7 by a screw head 10. A guide lug 11 axially upstream of the screw head 10 is fitted into a central bore 12 of the inner ring 7. The spacer sleeve 9 is supported on the end face of the inner ring 7 opposite the screw head 10, the spacer sleeve 9 also being centered in the inner ring 7 with a guide collar 13. The spacer sleeve 9 is provided with a through hole 14 for the fastening screw 8. On the end face 15 facing away from the rolling bearing 2, the spacer sleeve 9 is stepped in the region of the through bore 14 and forms an axially offset recess 16.
Zur Bildung einer Transportsicherung 17, die gleichzeitig als Montagesicherung dient, ist die Distanzhülse 9 mit mehreren umfangsverteilt angeordneten mit in Richtung der Befestigungsschraube 8 radial ausgerichteten Vorsprüngen 18 versehen. Diese vorzugsweise durch eine Materialumformung gebildeten Vorsprünge 18 sind einem Schraubenschaft 19 der Befestigungsschraube 8 zugeordnet und bilden dabei eine radiale Überdeckung zu einem Gewindeabschnitt 20. Wie der Figur 1 zu entnehmen ist, bildet die Befestigungsschraube 8 einen Schraubenschaft 19, dessen Durchmesser „d" kleiner ist als der Gewindeabschnitt 20 der Befestigungsschraube 8. Damit stellt sich zwischen der Transportsicherung 17 und dem Gewindeschaft 20 eine radiale Überdeckung ein, die eine wirksame Verliersicherung der Befestigungsschraube darstellt. Die zur Transportsicherung vorgesehenen radialen Vorsprünge 18 werden nach erfolgter Montage der Befestigungsschraube 8 in die Distanzhülse 9 eingebracht. Für eine als Gußteil gestaltete Distanzhülse 9 bietet es sich an, diese mit Vorsprüngen 18 abzugießen. Die fertig gegossene Distanzhülse 9 be- darf folglich zur Schaffung der Transportsicherung keine Nacharbeit.To form a transport lock 17, which also serves as an assembly lock, the spacer sleeve 9 is provided with a plurality of circumferentially distributed projections 18 with projections 18 oriented radially in the direction of the fastening screw 8. These projections 18, which are preferably formed by a material deformation, are assigned to a screw shaft 19 of the fastening screw 8 and thereby form a radial overlap with a threaded section 20. As can be seen in FIG. 1, the fastening screw 8 forms a screw shaft 19 whose diameter "d" is smaller as the threaded section 20 of the fastening screw 8. This creates a radial overlap, which represents an effective protection against loss of the fastening screw, between the transport lock 17 and the threaded shaft 20. The radial projections 18 provided for the transport lock become in the spacer sleeve 9 after the fastening screw 8 has been installed For a spacer sleeve 9 designed as a cast part, it is advisable to cast it off with projections 18. The finished spacer sleeve 9 consequently does not require any rework to create the transport lock.
Die Anordnung der radialen Vorsprünge 18 verdeutlicht die Figur 2, die in einer vergrößerten Darstellung das Detail „z" gemäß Figur 1 zeigt. Danach ist der radiale Vorsprung 18 bis an den Schraubenschaft 19 der Befestigungsschraube 8 geführt und bildet damit einen Kraftschluss bzw. einen Preßverband. Damit ist eine gewollte lagepositionierte Anordnung der Befestigungsschraube 8 gegenüber der Distanzhülse 9 und damit der Umlaufrolle 1 gewährleistet, was den Einbau der gesamten Umlenkrolle 1 beispielsweise an einer Brennkraftmaschine vereinfacht. Die Figur 2 zeigt außerdem eine als halbrunde Ausnehmung gestaltete Verstemmung 21 an der Distanzhülse 9, die den Vorsprung 18 bildet, mittels einer örtlichen Materialumformung. Der radiale Vorsprung 18 stützt sich kraftschlüssig mit einer Punkt- oder Linienberührung an der Mantel- fläche der Befestigungsschraube 8 ab. Aufgrund der Werkstoffelastizität bzw. der unterschiedlichen Werkstofffestigkeit zwischen der vorzugsweise aus Aluminium hergestellten Distanzhülse 9 und der Befestigungsschraube 8 aus Stahl paßt sich der Vorsprung 18 der Mantelfläche der Befestigungsschraube 8 an und verformt sich dabei. Die kraftschlüssige Anlage der radialen Vorsprünge 18 am Schraubenschaft 19 bewirkt einen sicheren Zusammenhalt aller Bauteile der Umlenkrolle 1. Diese Transportsicherung 17 gewährleistet selbst bei einem Transport einen Zusammenhalt aller Bauteile der Umlenkrolle 1 und ermöglicht eine vereinfachte Montage. The arrangement of the radial projections 18 is illustrated in FIG. 2, which shows the detail “z” in accordance with FIG. 1 in an enlarged representation radial projection 18 up to the screw shaft 19 of the fastening screw 8 and thus forms a frictional connection or a press fit. This ensures a desired position-positioned arrangement of the fastening screw 8 with respect to the spacer sleeve 9 and thus the idler roller 1, which simplifies the installation of the entire idler roller 1, for example on an internal combustion engine. FIG. 2 also shows a caulking 21 designed as a semicircular recess on the spacer sleeve 9, which forms the projection 18, by means of a local material forming. The radial projection 18 is supported non-positively with a point or line contact on the lateral surface of the fastening screw 8. Due to the material elasticity or the different material strength between the spacer sleeve 9, which is preferably made of aluminum, and the fastening screw 8 made of steel, the projection 18 adjusts to the outer surface of the fastening screw 8 and deforms in the process. The non-positive contact of the radial projections 18 on the screw shaft 19 ensures that all components of the deflection roller 1 are held together securely. This transport lock 17 ensures that all components of the deflection roller 1 are held together even during transport and enables simplified assembly.
Bezugszahlenreference numerals
Umlenkrolleidler pulley
Wälzlagerroller bearing
Außenringouter ring
Ringkörperring body
Mantelflächelateral surface
Zugmitteltraction means
Innenringinner ring
Befestigungsschraubefixing screw
DistanzhülseStand Off
Schraubenkopfscrew head
Führungsansatzleadership approach
Bohrungdrilling
Führungsbundguide collar
DurchgangsbohrungThrough Hole
Stirnseitefront
Aussparungrecess
Transportsicherungtransport safety
Vorsprunghead Start
Schraubenschaftscrew shaft
Gewindeabschnittthreaded portion
Verstemmung caulking
Patentansprücheclaims
1. Umlenkrolle (1 ), die einem Zugmitteltrieb zugeordnet ist, umfassend:1. deflection roller (1), which is assigned to a traction drive, comprising:
ein Wälzlager (2), mit einem drehfixierten Innenring (7) und einem rotierenden Außenring (3), dera roller bearing (2), with a rotationally fixed inner ring (7) and a rotating outer ring (3), the
von einem Ringkörper (4) umschlossen ist, an dessen Mantelflä- ehe (5) ein Zugmittel (6) geführt ist, undis enclosed by an annular body (4), on the lateral surface (5) of which a traction means (6) is guided, and
Haltemittel, wie eine in den Innenring (7) eingesetzte Befestigungsschraube (8), die mittels einer Transportsicherung (17) die Umlenkrolle (1) gemeinsam mit einer Distanzhülse (9), zur Bil- düng einer Baueinheit zusammenfügt, dadurch gekennzeichnet, dass als Transportsicherung die Distanzhülse (9) zumindest einen radial nach innen gerichteten Vorsprung (18) aufweist, der die Befestigungsschraube (8) kraftschlüssig sichert.Holding means, such as a fastening screw (8) inserted into the inner ring (7), which, by means of a transport lock (17), joins the deflection roller (1) together with a spacer sleeve (9) to form a structural unit, characterized in that it serves as a transport lock the spacer sleeve (9) has at least one radially inward projection (18) which secures the fastening screw (8) in a force-locking manner.
2. Umlenkrolle nach Anspruch 1, wobei die Distanzhülse (9) mit symmetrisch umfangsverteilt angeordneten, radialen Vorsprüngen (18) versehen ist.2. deflection roller according to claim 1, wherein the spacer sleeve (9) is provided with symmetrically circumferentially arranged radial projections (18).
3. Umlenkrolle nach Anspruch 1, wobei die Befestigungsschraube (8) im Bereich des Schraubenkopfes (10) über einen in dem Innenring (7) des3. guide roller according to claim 1, wherein the fastening screw (8) in the region of the screw head (10) via a in the inner ring (7) of the
Wälzlagers (2) eingepassten Führungsansatz (11 ) zentriert ist.Rolling bearing (2) fitted guide projection (11) is centered.
4. Umlenkrolle nach Anspruch 2, wobei die radialen Vorsprünge (18) kraftschlüssig an einer Mantelfläche eines Schraubenschaftes (19) der Be- festigungsschraube (8) anliegen.4. deflection roller according to claim 2, wherein the radial projections (18) non-positively on a lateral surface of a screw shaft (19) of the fastening screw (8).
5. Umlenkrolle nach Anspruch 1, wobei der Schraubenkopf (10) der Befestigungsschraube (8) und die Distanzhülse (9) an gegenüberliegenden Stirnseiten des Wälzlager-Innenrings (7) abgestützt sind und die Transportsicherung (17) eine Einbaulage der Befestigungsschraube (8) definiert.5. guide roller according to claim 1, wherein the screw head (10) of the fastening screw (8) and the spacer sleeve (9) on opposite End faces of the inner bearing ring (7) are supported and the transport lock (17) defines an installation position of the fastening screw (8).
6. Umlenkrolle nach Anspruch 1, wobei die radialen Vorsprünge (18) in einem axial zur Stirnseite (15) der Distanzhülse (9) angeordneten Aussparung (16) angeordnet sind.6. deflection roller according to claim 1, wherein the radial projections (18) in an axially to the end face (15) of the spacer sleeve (9) arranged recess (16) are arranged.
7. Umlenkrolle nach Anspruch 1 , deren als Gussteil ausgebildete Distanz- hülse (9) als Rohling mit radialen Vorsprüngen (18) versehen ist.7. Deflection roller according to claim 1, the spacer sleeve (9) of which is formed as a casting and is provided as a blank with radial projections (18).
8. Umlenkrolle nach Anspruch 1, wobei nach der Montage der Befestigungsschraube (8) die radialen Vorsprünge (18) mittels einer Materialverformung durch Verstemmen in die Distanzhülse (9) eingebracht sind.8. guide roller according to claim 1, wherein after the mounting of the fastening screw (8), the radial projections (18) by means of a material deformation by caulking are introduced into the spacer sleeve (9).
9. Umlenkrolle nach Anspruch 1, bei der die radialen Vorsprünge (18) eine weitestgehend halbrundartig geformte Querschnittsform aufweisen.9. deflection roller according to claim 1, wherein the radial projections (18) have a largely semicircular shaped cross-sectional shape.
10. Umlenkrolle nach Anspruch 1 , wobei die Distanzhülse (9) aus Aluminium oder einer Aluminiumlegierung hergestellt ist. 10. guide roller according to claim 1, wherein the spacer sleeve (9) is made of aluminum or an aluminum alloy.
EP01957966A 2000-09-06 2001-07-14 Deflection pulley for a traction mechanism drive Withdrawn EP1315912A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10043840 2000-09-06
DE10043840A DE10043840A1 (en) 2000-09-06 2000-09-06 Deflection roller for a traction drive
PCT/EP2001/008135 WO2002021005A1 (en) 2000-09-06 2001-07-14 Deflection pulley for a traction mechanism drive

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EP1315912A1 true EP1315912A1 (en) 2003-06-04

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US (1) US7041020B2 (en)
EP (1) EP1315912A1 (en)
AU (1) AU2001279749A1 (en)
CZ (1) CZ301115B6 (en)
DE (1) DE10043840A1 (en)
WO (1) WO2002021005A1 (en)

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US7041020B2 (en) 2006-05-09
CZ2003816A3 (en) 2003-10-15
CZ301115B6 (en) 2009-11-11
US20040097313A1 (en) 2004-05-20
DE10043840A1 (en) 2002-03-14
AU2001279749A1 (en) 2002-03-22
WO2002021005A1 (en) 2002-03-14

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