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WO1999037940A1 - Dispositif de serrage pour moyen de traction pourvu d'un dispositif d'amortissement hydraulique - Google Patents

Dispositif de serrage pour moyen de traction pourvu d'un dispositif d'amortissement hydraulique Download PDF

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Publication number
WO1999037940A1
WO1999037940A1 PCT/EP1999/000106 EP9900106W WO9937940A1 WO 1999037940 A1 WO1999037940 A1 WO 1999037940A1 EP 9900106 W EP9900106 W EP 9900106W WO 9937940 A1 WO9937940 A1 WO 9937940A1
Authority
WO
WIPO (PCT)
Prior art keywords
clamping device
cylinder
housing
tensioning
chamber
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/EP1999/000106
Other languages
German (de)
English (en)
Inventor
Rudolf Berger
Werner Petri
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.)
INA Waelzlager Schaeffler OHG
Original Assignee
INA Waelzlager Schaeffler OHG
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 Waelzlager Schaeffler OHG filed Critical INA Waelzlager Schaeffler OHG
Priority to DE19980089T priority Critical patent/DE19980089D2/de
Publication of WO1999037940A1 publication Critical patent/WO1999037940A1/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
    • F16H7/1209—Means for varying tension of belts, ropes or chains  by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • F16H7/1236—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 fluid and restriction type, e.g. dashpot
    • 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
    • F16H2007/0806—Compression coil 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 
    • F16H2007/0802—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 
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0812—Fluid pressure
    • 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 
    • F16H7/0848—Means for varying tension of belts, ropes or chains  with means for impeding reverse motion
    • F16H2007/0859—Check valves

Definitions

  • the present invention relates to tensioning devices for traction means, such as belts and chains.
  • tensioning devices are preferably used in the belt or chain drive of internal combustion engines in motor vehicles.
  • a tensioning device for belts in which a tensioning roller is rotatably mounted on a tensioning arm designed as an eccentric.
  • the eccentric is pivotally mounted on a bolt and spring-loaded against the belt by means of a spring element.
  • a hydraulic damping element is provided, which dampens retrograde movements of the tensioning arm away from the belt.
  • This hydraulic damping element is a separate component which has a cylinder in which a piston is immersed, the piston and the cylinder delimiting a pressure space which communicates via a one-way valve with a reservoir for hydraulic fluid likewise provided in this component.
  • the object of the present invention is therefore to provide a tensioning device known according to the features of the preamble of claim 1, which 2 comparatively less space is required and, as a result, can be provided more easily in the belt or chain drive, in particular of internal combustion engines.
  • this object is achieved in that a housing is provided with chambers which are liquid-tightly separated by a partition, the spring element being provided in one chamber and the damping element in the other chamber, which other chamber forms the reservoir.
  • a separate reservoir of the damping element can be dispensed with.
  • the space required can be considerably reduced with the further development according to the invention.
  • the damping element used in the tensioning device according to the invention does not contain its own reservoir and therefore less enclosed space is created, the tensioning device according to the invention has less mass, which is desirable in modern motor vehicles.
  • the damping element is provided for damping movements of the tensioning arm, which it executes in the opposite direction to the resilience of the tensioning arm by the spring element.
  • Such a swivel joint can have a spherical head accommodated in a socket, wherein the socket can be formed in the reservoir on the housing side and on the lever on the clamping arm side.
  • the cylinder and the piston each have a spherical head at their opposite ends.
  • a spherical surface for example, a partially cylindrical surface can also be provided.
  • a spring element for example a helical compression spring, is provided which acts on the one hand on the piston and on the other hand on the cylinder in such a way that the ball heads of the piston and cylinder are spring-loaded against the pans.
  • the damping element is arranged in the other chamber such that its check valve is immersed in the hydraulic fluid of the reservoir.
  • an annular gap present between the shaft and the partition is closed by means of at least one sealing ring.
  • the cylinder is designed in a straight line, so that movements of the piston in the cylinder also take place along a straight line.
  • a particularly favorable development according to the invention provides that the cylinder is curved.
  • the piston which is arranged to be longitudinally displaceable therein is consequently not displaced along a straight line but rather along a curved line.
  • This curved cylinder is preferably arranged at least approximately concentrically with the shaft.
  • Cylinder achieves that an extension of the possible piston travel is achieved within the available space without providing additional radial space for the cylinder.
  • FIG. 1 shows a longitudinal section through a tensioning device according to the invention
  • FIG. 2 shows a cross section through the tensioning device from FIG. 1,
  • FIG. 3 shows the damping device from FIG. 2 in a view rotated by 90 °
  • Figure 4 shows a cross section through a further tensioning device according to the invention
  • Figure 5 shows a cross section through a further tensioning device according to the invention.
  • a housing 1 and a tensioning arm 2 which is arranged pivotably with respect to the housing 1 are provided, at one end of which a tensioning roller 2a, which is only shown in broken lines, is arranged and which rests on a belt, not shown.
  • the tensioning arm 2 is spring-loaded against the belt (not shown) by means of a helical torsion spring 3, the helical torsion spring 3 being supported on the one hand on the housing 1 and on the other hand engaging the tensioning arm 2 while exerting a torsional moment.
  • the tension arm 2 is non-rotatably on a shaft 4 5 arranged, which is accommodated in the housing 1 and is pivotally mounted relative to the housing 1 by means of two radial bearings 5.
  • the housing 1 is provided with a partition 6, which is arranged transversely to the shaft 4 and which is pierced by the shaft 4.
  • This partition 6 separates two chambers 7, 8 from one another, one chamber 7 being designed as a reservoir for receiving hydraulic fluid, and the other chamber 8 being provided for receiving the helical torsion spring 3.
  • a damping element 9 is arranged in the chamber 7, which acts on the shaft 4 via a lever 10, the lever 10 being arranged on the shaft 4 in a rotationally fixed manner.
  • An annular space formed by the shaft 4 and the partition 6 is closed by means of a sealing ring 11, so that the two chambers 7, 8 are separated from one another in a liquid-tight manner.
  • the chamber 7 is closed to the environment in a liquid-tight manner by means of a cover 11 a.
  • FIG. 2 clearly shows the cut damping element 9, which comprises a cylinder 12, a piston 13 immersed therein, a pressure chamber 14 delimited by the cylinder 12 and the piston 13, the pressure chamber 14 communicating with the reservoir 7 via a check valve 15.
  • the damping element 9 is arranged in the chamber 7 such that the check valve 1 5 is below a liquid level of the hydraulic fluid.
  • FIG. 3 shows the damping element 9 in a view rotated by 90 °, this view clearly showing that the ends of the piston 13 and the cylinder 12 on pivot arms 16, 17 provided on the tension arm side and housing side via bearing eyes 18, 19 are pivotally received, the bearing eye 18 on the piston 13 and the bearing eye 19 on the cylinder 12 are formed.
  • the tensioning device according to the invention shown in FIG. 4 differs from the tensioning device described above essentially by modified rotary joints for the damping element.
  • the cylinder 12 and the piston 13 are each provided at their ends facing away from one another with a spherical head 20, 21, which are each pivotably arranged in a pan 22, 23. 6 are net, the pans 22, 23 are provided in the chamber 7 on the housing 1 and on the lever 10.
  • a helical compression spring 24 is arranged in the space delimited by the piston 13 and the cylinder 12, which acts on the one hand on the piston 13 and on the other hand on the cylinder 12 in such a way that the ball heads 20, 21 are spring-loaded against the pans 22, 23.
  • the helical compression spring 24 shown here can of course also be arranged outside the space delimited by the piston 1 3 and by the cylinder 12, ie externally.
  • an externally arranged leg spring is also conceivable, which engages the cylinder with one leg and the piston with the other leg.
  • the tensioning device according to the invention shown in FIG. 5 differs from that from FIG. 4 essentially in that the piston 13 and the cylinder 12 are curved. Accordingly, displacements of the piston 13 relative to the cylinder 12 do not take place along a straight line, but rather along a curved line which, as shown, is preferably designed as a circular path and is arranged concentrically to the shaft 4. With this development according to the invention, long displacement paths on the piston can be realized without an additional radial expansion on the housing 1 being necessary to accommodate an enlarged damping element 9.

Landscapes

  • 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 de serrage pour moyen de traction, en particulier pour une courroie, qui comprend un bras de serrage (2) sur lequel est monté un rouleau de serrage (2a). Ce bras de serrage (2) est maintenu contre le moyen de traction par un ressort (3). Ce dispositif comporte en outre un élément d'amortissement hydraulique (9) dont le piston (13), qui plonge dans un cylindre (2), délimite, avec ledit cylindre (12), une chambre de pression (14) qui communique, par l'intermédiaire d'une soupape à une voie (15), avec un réservoir (7) à liquide hydraulique. Pour réduire l'espace de montage nécessaire, il est proposé que le dispositif comporte un boîtier (1) présentant des chambres (7, 8) séparées de façon étanche aux liquides par une cloison (6), le ressort (3) se trouvant dans une des chambres (8) et l'élément d'amortissement (9) se trouvant dans l'autre chambre (7), laquelle chambre (7) forme le réservoir.
PCT/EP1999/000106 1998-01-27 1999-01-11 Dispositif de serrage pour moyen de traction pourvu d'un dispositif d'amortissement hydraulique Ceased WO1999037940A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19980089T DE19980089D2 (de) 1998-01-27 1999-01-11 Spanneinrichtung für Zugmittel mit hydraulischer Dämpfung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998102886 DE19802886A1 (de) 1998-01-27 1998-01-27 Spanneinrichtung für Zugmittel mit hydraulischer Dämpfung
DE19802886.5 1998-01-27

Publications (1)

Publication Number Publication Date
WO1999037940A1 true WO1999037940A1 (fr) 1999-07-29

Family

ID=7855702

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/000106 Ceased WO1999037940A1 (fr) 1998-01-27 1999-01-11 Dispositif de serrage pour moyen de traction pourvu d'un dispositif d'amortissement hydraulique

Country Status (2)

Country Link
DE (2) DE19802886A1 (fr)
WO (1) WO1999037940A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6312351B1 (en) * 1998-09-21 2001-11-06 Borgwarner Inc. Hydraulic tensioner with pivotal mount
US6955621B2 (en) * 2001-04-26 2005-10-18 Borgwarner Inc. Rotary actuating hydraulic tensioner
DE10209723B4 (de) 2002-03-06 2005-01-27 Claas Selbstfahrende Erntemaschinen Gmbh Einrichtung zur Dämpfung von Schwingungen in Zugmittelantrieben

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536172A (en) * 1984-02-21 1985-08-20 Dayco Corporation Belt tensioner and method of making the same
EP0300858A1 (fr) * 1987-07-02 1989-01-25 Hutchinson Dispositif de tendeur rotatif pour courroie de transmission de puissance
US5558587A (en) * 1995-05-15 1996-09-24 Eaton Corporation Self-contained hydraulic belt tensioner
DE19614546A1 (de) 1995-04-13 1996-10-17 Ntn Toyo Bearing Co Ltd Selbsttätige Spannvorrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH279415A (fr) * 1948-09-09 1951-11-30 Lancia Automobili Tendeur pour organe flexible de transmission mécanique.
DE4015269C1 (en) * 1990-05-12 1991-10-02 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Vehicle IC engine belt tensioner - has tension lever pivoted on fixed axis with ramp cooperating with sprung piston

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536172A (en) * 1984-02-21 1985-08-20 Dayco Corporation Belt tensioner and method of making the same
EP0300858A1 (fr) * 1987-07-02 1989-01-25 Hutchinson Dispositif de tendeur rotatif pour courroie de transmission de puissance
DE19614546A1 (de) 1995-04-13 1996-10-17 Ntn Toyo Bearing Co Ltd Selbsttätige Spannvorrichtung
US5558587A (en) * 1995-05-15 1996-09-24 Eaton Corporation Self-contained hydraulic belt tensioner

Also Published As

Publication number Publication date
DE19980089D2 (de) 2001-02-01
DE19802886A1 (de) 1999-07-29

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