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WO2008055783A1 - Dispositif tendeur à excentrique - Google Patents

Dispositif tendeur à excentrique Download PDF

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Publication number
WO2008055783A1
WO2008055783A1 PCT/EP2007/061395 EP2007061395W WO2008055783A1 WO 2008055783 A1 WO2008055783 A1 WO 2008055783A1 EP 2007061395 W EP2007061395 W EP 2007061395W WO 2008055783 A1 WO2008055783 A1 WO 2008055783A1
Authority
WO
WIPO (PCT)
Prior art keywords
eccentric
clamping device
base plate
working
eccentric clamping
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.)
Ceased
Application number
PCT/EP2007/061395
Other languages
German (de)
English (en)
Inventor
Niels FLÄMIG
Rainer BAUMÜLLER
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
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
Priority claimed from DE202007005928U external-priority patent/DE202007005928U1/de
Priority claimed from US11/774,028 external-priority patent/US20080113835A1/en
Application filed by Schaeffler KG filed Critical Schaeffler KG
Publication of WO2008055783A1 publication Critical patent/WO2008055783A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes or chains 
    • F16H7/10—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • 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 
    • F16H7/10—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley
    • F16H7/1209—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • F16H7/1218—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley with vibration damping means of the dry friction type
    • 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 
    • F16H2007/0842—Mounting or support of tensioner
    • F16H2007/0844—Mounting elements essentially within boundaries of final output members

Definitions

  • the present invention relates to an eccentric tensioning device for tensioning a traction means, for example a flat or toothed belt, of a traction mechanism.
  • the invention relates in this case to an eccentric clamping device provided for incorporation into a traction mechanism drive of an internal combustion engine which automatically ensures a required pretensioning of the traction means by means of an adjusting torque generated by a spring device.
  • a clamping device of the aforementioned type is known for example from DE 40 33 777 AI.
  • This conventional tensioning device also referred to as a double eccentric tensioning device, comprises a setting eccentric which has an eccentrically arranged bore provided for receiving a fastening screw.
  • the tensioning device is fastened to a housing, in particular a housing of the internal combustion engine, wherein the adjustment eccentric is supported on the housing via a base plate.
  • a working or operating eccentric is placed, being provided in an annular gap between a lateral surface of the adjustment eccentric and an inner wall of the operating eccentric a sliding bearing.
  • a roller bearing surrounds the operating eccentric whose outer ring acts directly as a running disk which, as such, rests on the traction means of the traction mechanism drive in the installed state, thereby acting on it with a transverse force directed transversely to the running direction.
  • a torsion spring is arranged between the base plate and the operating eccentric, which permanently urges the operating eccentric and the associated running disk into a position exciting the traction means.
  • roller device which, as such, comprises a running disc and a bearing provided for supporting the same
  • a working eccentric for supporting the roller device such that it is displaceable in accordance with a pivoting of the working eccentric in a direction radial to the axis of rotation of the bearing
  • a torsion spring for biasing the working eccentric
  • a fixing device for securing the working eccentric in a mounting position in which the torsion spring is in a prestressed state
  • a base plate structure which is rotatably anchored to a provided for connection of the Exzenterspannvor- direction Anflansch requirements, - wherein the fixing device is designed such that it automatically releases in the context of tightening a fastening screw by which the eccentric tensioning device is connected to the Anflansch measurements.
  • the tensioning device in which is fixed during the assembly of the traction means of the working or the operating eccentric under bias of the torsion spring in a pivoted away from the Switzerlandstofflaufpfad end position, said securing state are repealed in the context of Verbaus the tensioning device can.
  • the working eccentric is preferably fixed in that locking or mounting position so that relative movements between the working eccentric and the base plate are prevented.
  • the fixing device is designed such that it by means of tightening the fastening screw by which the eccentric tensioning device, in particular a setting eccentric thereof is screwed to the, the tensioning device bearing Anflansch requirements, automatically triggers.
  • Activation procedure of the fixing device can be introduced in particular by running over the free-switching path under the effect of the axial force applied by the fastening screw in the connection of the eccentric clamping device to the Anflansch Structure of components of the clamping device or a first in the clamping device provided axial clearance is eliminated ,
  • an engagement structure of the fixing device can be brought into a release state.
  • the engagement structure is preferably rigidly coupled to the working eccentric.
  • the fixing device according to the invention is preferably designed so that in the mounting position, the engagement structure is engaged with a holding element which is provided by the base plate.
  • the transfer of the engagement structure into the release state is preferably carried out by axial displacement of the engagement structure relative to the retaining element.
  • the spring device provided for generating the torsional moment which pivots the working eccentric is preferably designed as a helical spring.
  • This coil spring may be formed so that it has a plurality of spring coils.
  • the helical spring can be embodied as a limbless helical spring, so that the forces generated by this helical spring can be transmitted over the end faces of the spring ends and, if necessary, over an end thereof around a NEN angle of typically 90 ° offset circumferential portion are introduced into the respective, loaded by the spring components.
  • the spring may also be provided with anchoring structures, in particular in the form of hook sections, in the area of the spring ends. These hook sections can in particular be made by radially inwardly or outwardly bent-off wire ends of the spring structure.
  • the spring device can be designed such that it has a polygonal, in particular square or flat cross section. Furthermore, the spring device is preferably designed so that it is compressed in the installed state, at least slightly, for example, to 30% of its length in the axially unloaded state.
  • the tensioning device preferably comprises a damping or braking device, which as such serves to generate an eccentric braking torque, by means of which the pivoting of the working eccentric is braked.
  • This damping or braking device can be formed by an axially loaded disk structure, by a radially loaded bushing structure, or by an axially loaded cone structure.
  • at least part of the loading force acting on this damping or braking device is generated or transmitted by the torsion spring.
  • At least one of the frictional force generating frictional partner is preferably made of a possibly loaded with fillers plastic material.
  • the working eccentric can be made of a plastic material. It is also also possible to perform the working eccentric integral with the inner ring of the bearing. Furthermore, it is also possible to carry out the running disk in one piece with the outer ring of the rolling bearing.
  • the working eccentric is mounted on a setting eccentric.
  • fixing device according to the invention or in particular by an additional, for example designed as a shear structure fixing device is preferably the Position of the working eccentric also set against the setting eccentric. It is possible to make the clamping device constructive in such a way that the adjusting eccentric is axially displaceable by a small distance relative to the working eccentric or a base plate, wherein the release state of the fixing device can be brought about by means of the axial displacement of the adjusting eccentric, in particular under the action of the fastening screw.
  • the base plate is preferably designed in such a way that it comprises a ring disk section provided for clamping onto the flange surface.
  • This annular disc portion may be designed so that it is rotatably coupled in the region of an inner peripheral edge with a bearing bush.
  • a projection or other engagement structure may be formed, which serves as such / such the rotationally fixed anchoring of the base plate to the Anflansch requirements.
  • the approach is such that the rotationally fixed anchoring of the base plate is achieved at the Anflansch materials before the fixing device enters a release state, or before the axial release path is overcome.
  • the tensioning device according to the invention so that the release state is not achieved by axial loading of the tensioning roller device, but, for example, by pivoting back the working eccentric against the pivoting direction caused by the torsion spring.
  • resiliently preloaded into a release position locking member can be unlocked and release the working eccentric so that it is pivoted under the action of the torsion spring to the Switzerlandstofflaufpfand out and thus the running disk is lowered onto the traction means.
  • securing means are provided by which re-engagement of the fixing device is prevented. This makes it possible to ensure that no unintentional reclosing of the fixing device takes place during operation of the clamping device.
  • a connected to the operating eccentric, radially aligned pointer is non-positively and / or positively supported on a support member of the base plate or the adjustment eccentric.
  • the work eccentric and the pointer connected thereto are pressed in a force-fitting manner against the retaining element of the base plate by the force of the torsion spring and thus fixed in position.
  • the pointer assumes this position by a limited axial displacement of the working eccentric relative to the adjustment eccentric or the base plate, wherein this displacement takes place in the direction of a Axialkraftkompo- component of the torsion spring.
  • the tensioning device is loosened by means of the fastening screw, i. without rigid attachment, positioned on the internal combustion engine.
  • a position-oriented installation position of the clamping device sets.
  • the operating eccentric is fixed in an end stop, which is also referred to as a hot stop, whereby the traction means, in particular a belt, mounted simplified, i. can be placed on all pulleys of the traction drive.
  • the clamping device is rigidly attached to the housing of the internal combustion engine by means of the fastening screw.
  • the adjusting eccentric and the base plate connected thereto shifts axially in the direction of the internal combustion engine, whereby the pointer integrally connected to the base plate is released from the retaining element and the torsion spring the operating eccentric twisted into a position biasing the traction means.
  • the release of the pointer and thus the working eccentric from the lock during the mounting position is thus achieved as soon as an axial play "S" between the working eccentric and the base plate or the adjusting eccentric is compensated or reduced by screwing on the clamping device.
  • the locking can be achieved by suitable shaping of the base plate alone or with the aid of additional elements such as e.g. Cotter pins or a sheet done, which are removed after applying traction means to tension the traction means.
  • Another embodiment for positioning the operating or working eccentric in a mounting position provides to make the locking device for maintaining the prestressed torsion spring so that it does not exceed the radial outer contour of the clamping unit.
  • a frontally on the flange of the engine adjacent side of the working eccentric introduced groove or recess in the working eccentric or in the base plate, in which engages a form fit, adhesion or by a combination of both ways intervening fuse to a rotational movement of the To prevent working sexzenters against the base plate or the adjustment eccentric in the assembly position.
  • the cooperating with the groove or the recess counterpart can be designed as a bent part, casting or as an attachment (eg as a dowel pin).
  • the exit of the counterpart from the groove or the recess in the direction of Nutterrorisms is prevented by the caulking of the working eccentric and the associated limitation of the axial play of the clamping unit.
  • the counterpart surrounds the working eccentric. In the mounting position engages a particular standing in connection with the base plate molding in a groove or recess of the working eccentric due to the axial force of the torsion spring is between the base plate and the working eccentric an effective backup in the mounting position.
  • the invention is particularly directed to tensioning devices that ensure a nearly constant biasing force of the traction device under all operating conditions and with which continue a long life can be achieved.
  • the measures according to the invention enable a semi-automated adjustment of the required traction force during the initial assembly and a service to compensate for:
  • Length tolerances of the traction means in particular toothed belts; Belt wear; Temperature differences; and effects due to the dynamic behavior of the internal combustion engine.
  • Figure 1 is an axial sectional view for illustrating the construction of a tensioning device according to the invention with an operating eccentric and a setting eccentric and a fixing device according to the invention;
  • FIG. 2 shows a detailed representation to illustrate the structure of a shear structure of the tensioning device according to FIG. 1;
  • FIG. 3 a perspective view of a tensioning device in the pretensioned, locked state
  • FIG. 4 shows a side view of the clamping device according to FIG. 3 in a state in which the fixing device is just entering a release position
  • Figure 5 is an illustration of the tensioning device in a state in which the unlocked pointer just passes under the holding device
  • Figure 6 is a perspective view of another clamping device in the pretensioned or locked state with a slightly modified design of the holding device and the pointer cooperating therewith;
  • FIG. 7 shows a further perspective view of a third variant of a tensioning device, also in the pretensioned or locked state
  • FIG. 8 shows a perspective view of a base plate of a clamping device with a further fixing device or securing structure for fixing the working eccentric in an assembly position.
  • FIG. 1 shows a first variant of a tensioning device 1b according to the invention, in which a setting eccentric 2b is fastened to a housing 12 via a fastening screw 11. The adjustment eccentric 2b is inserted into a hollow cylindrical support body 13, via which the tensioning device 1b is supported on the housing 12.
  • the tensioning device comprises an operating eccentric 4b which is rotatably mounted on the support body 13 via a sliding bearing 5b.
  • the operating eccentric 4b On the outside, the operating eccentric 4b is enclosed by a roller bearing 6b which carries a running disk 7b.
  • a torsion spring 9b is disposed between a base plate 10b and the operating eccentric 4b.
  • a pointer 14 arranged locally on the operating eccentric 4b has, in particular, the task of visually indicating the position of the operating eccentric 4b with respect to the base plate 10b.
  • the construction of the tensioning device 1b includes an axial clearance "s" between an end face of the operating eccentric 4b and the base plate 10b.
  • a friction disc 21 is inserted between an end face of the operating eccentric 4b and a rim 20 of the adjustment eccentric 2b, which has an axially protruding pin 22 of the form fit engages in a designed as a blind hole receptacle 23. Furthermore, the friction disc 21 includes on the inner circumference a radially inwardly directed shear pin 24, which engages in an end-side groove 25 of the support body 13.
  • the operating eccentric 4b and the adjusting eccentric 2b are aligned with one another such that the circumferential wall of the running disk 7b occupies its greatest possible distance from the running path of the tensioning means of the traction mechanism drive to be tensioned. In this state, the traction means can be easily placed on the associated pulleys of the belt drive.
  • the pointer 14 of the operating eccentric 4b is in an operative connection with a holding element 15a assigned to the base plate IOb.
  • a holding element 15a assigned to the base plate IOb.
  • the holding element 15a comprises, for example, on the end side a U-shaped offset 16 which forms a free radially inwardly directed rim 17.
  • the running disk 7b is initially displaced in the direction of the base plate IOb in opposition to an axial force exerted by the torsion spring 9b in conjunction with the operating eccentric 4b. The shift is made possible by the axial release path S permitted between the operating eccentric 4b and the base plate IOb.
  • These pivot stop structures form part of the operating eccentric 4b. Between these two pivot stop structures B1, B2 is an integral with the base plate 10b executed inner stop A1 displaced.
  • the safety device realized between the pointer and the holding element 15a can be realized structurally in some other way, in particular as will be explained in more detail below.
  • this safety device it is possible to make this safety device so that, for example, a local overlap between the pointer 14 and the board 17 of the holding member 15a is rich enough, and is secured by appropriate the pointer in the direction of thrust supporting stops of the hands, under the action of the axial force of Torsion spring 9b of the pointer 14 is urged into the latching structure formed on the holding element 15a.
  • FIG. 5 shows the tensioning device in a state in which the pointer 14 is already outside of the retaining element 15a.
  • the operating eccentric 4b can pivot into its operating position in a spring-loaded manner until there is a balance of power between the radial force generated by the operating eccentric under the action of the torsion spring and the traction mechanism reaction forces acting on the running disk.
  • FIG. 6 shows a further variant of a tensioning device according to the invention.
  • the holding device 15a supporting the pointer 14 is designed such that under the action of the force acting on the holding device 15 by the pointer 14, a certain axial securing of the pointer 14 is achieved.
  • concave / convex geometries can be implemented.
  • the holding device 15a is produced by a stop-lug portion which is formed integrally with the base plate 10b.
  • a slight recess may be formed, in which the pointer 14 is seated sufficiently secured under the action of the biasing force generated by the torsion spring.
  • FIG. 8 shows in a perspective the base plate 10 for a further variant of a fixing device.
  • a retaining element I5b embodied here in one piece with the base plate 10b includes a plate following the radius of curvature of the running disk 7b.
  • a slot 18 inserted in the sheet is intended to guide the pointer 14. In the prestressed position corresponding to the mounting position of the operating eccentric 4b relative to the base plate 10b, or the adjusting eccentric 2b, the pointer 14 is fixed in the end position by a separate pin 19.
  • the rolling bearing 6 of the clamping device is preferably designed as a radial roller bearing 6 which consists of an inner bearing ring and an outer bearing ring and a plurality between the bearing rings in grooved raceways rolling, held by a bearing cage at regular intervals held each other rolling elements and axially on both sides of its rolling elements in each case a seal with which of the trained as a grease deposit space is sealed between the bearing rings,
  • this rolling bearing is characterized in that it is designed as a ball roller bearing whose rolling elements are designed as ball rollers with two symmetrically flattened from a spherical base and arranged parallel to each other side surfaces ,
  • This ball roller bearing offers over a comparable ball bearing by the higher number of mountable rolling elements increased load capacity and at the same time by the reduced space of the rolling elements an enlarged grease depot.
  • the rolling elements of the radial roller bearing formed as ball rollers are preferably designed so that they preferably have a width between their side surfaces of about 70% of the diameter of their basic ball shape and by a distance of about 80% of the diameter of the ball basic shape of the rolling elements having distance between the concentric with each other arranged bearing rings initially axially "flat” into the radial roller bearing insertable and are pivotable by a corresponding rotation through 90 ° in the raceways of the bearing rings.
  • the outer bearing ring can here directly form the running disk, the inner bearing ring can be formed directly by the working eccentric.

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

Abstract

L'invention concerne un dispositif tendeur à excentrique pour tendre un moyen de traction, réalisé par exemple sous forme de courroie plate ou dentée, d'une transmission à moyen de traction. L'invention vise à fournir des solutions qui apportent des avantages en terme de technique de montage pour l'installation de dispositifs tendeurs et l'incorporation du moyen de traction dans la transmission à moyen de traction. Selon l'invention, on y parvient par un dispositif tendeur à excentrique pour une transmission à moyen de traction qui comprend : un ensemble de poulie comprenant en soi une poulie et un palier à roulement prévu pour le montage de celle-ci ; un excentrique de travail pour soutenir l'ensemble de poulie de telle sorte que ce dernier peut, en fonction d'un pivotement de l'excentrique de travail, être déplacé dans une direction radiale par rapport à l'axe de révolution du palier à roulement ; un ressort de torsion pour précontrainte l'excentrique de travail ; un dispositif d'immobilisation pour assujettir l'excentrique de travail dans une position de montage dans laquelle le ressort de torsion se trouve dans un état précontraint ; et une structure de plaque de base qui peut être ancrée bloquée en rotation sur une surface de bridage prévue pour le rattachement du dispositif tendeur à excentrique. Le dispositif d'immobilisation est conçu de telle sorte qu'il est automatiquement libéré lors du serrage à bloc d'une vis de fixation par laquelle le dispositif tendeur à excentrique est vissé sur la surface de bridage.
PCT/EP2007/061395 2006-11-09 2007-10-24 Dispositif tendeur à excentrique Ceased WO2008055783A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102006053207.4 2006-11-09
DE102006053207 2006-11-09
DE202007005928.0 2007-04-25
DE202007005928U DE202007005928U1 (de) 2006-11-09 2007-04-25 Exzenter-Spannvorrichtung
US11/774,028 US20080113835A1 (en) 2006-11-09 2007-07-06 Eccentric tensioning device
US11/774,028 2007-07-06

Publications (1)

Publication Number Publication Date
WO2008055783A1 true WO2008055783A1 (fr) 2008-05-15

Family

ID=38959695

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/061395 Ceased WO2008055783A1 (fr) 2006-11-09 2007-10-24 Dispositif tendeur à excentrique

Country Status (1)

Country Link
WO (1) WO2008055783A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223324A1 (de) * 1992-07-16 1994-01-20 Schaeffler Waelzlager Kg Mechanische Spannvorrichtung für einen Riemen- oder Kettentrieb
DE4328209A1 (de) * 1993-08-21 1995-02-23 Schaeffler Waelzlager Kg Sich selbsttätig einstellbare Spannvorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223324A1 (de) * 1992-07-16 1994-01-20 Schaeffler Waelzlager Kg Mechanische Spannvorrichtung für einen Riemen- oder Kettentrieb
DE4328209A1 (de) * 1993-08-21 1995-02-23 Schaeffler Waelzlager Kg Sich selbsttätig einstellbare Spannvorrichtung

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