WO2020259747A1 - Élément d'accouplement pour une roue libre commutable dotée d'un ressort oméga et roue libre commutable munie d'un élément d'accouplement - Google Patents

Élément d'accouplement pour une roue libre commutable dotée d'un ressort oméga et roue libre commutable munie d'un élément d'accouplement Download PDF

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Publication number
WO2020259747A1
WO2020259747A1 PCT/DE2020/100473 DE2020100473W WO2020259747A1 WO 2020259747 A1 WO2020259747 A1 WO 2020259747A1 DE 2020100473 W DE2020100473 W DE 2020100473W WO 2020259747 A1 WO2020259747 A1 WO 2020259747A1
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WO
WIPO (PCT)
Prior art keywords
spring
omega spring
omega
cage
coupling element
Prior art date
Application number
PCT/DE2020/100473
Other languages
German (de)
English (en)
Inventor
Christian Hartmann
Original Assignee
Schaeffler Technologies AG & 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 AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2020259747A1 publication Critical patent/WO2020259747A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/04—Freewheels or freewheel clutches combined with a clutch for locking the driving and driven 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/08—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
    • F16D2023/123—Clutch actuation by cams, ramps or ball-screw mechanisms

Definitions

  • the invention relates to a coupling element for a switchable freewheel, a switchable freewheel with such a coupling element and an omega spring.
  • Freewheels are used for power transmission in a drive train when a drive torque is to be transmitted in a first direction of rotation, but decoupling from the driven part of the drive train is to be made possible when rotating against the first direction of rotation in order to avoid a rigid hub connection.
  • the friction in the drive train can be reduced, since in the freewheeling mode there is a decoupling of the
  • Drive machine can take place from the output shaft and the drive machine and the rigidly connected element do not have to be dragged through the drive train.
  • a freewheel with a drive element and an output element is known, a cage being arranged between the drive element and the output element.
  • clamping rollers and spring elements are provided which spring the clamping rollers against clamping ramps, with a torque being transferable from the drive element to the output element in a load rotation direction, while a free-wheel function is enabled in a free-wheel rotation direction.
  • an intermediate ring having the clamping ramps and radially displaceable ring segments is provided between the drive element and the output element, which create a frictional connection with the output element in the load rotation direction.
  • Front wheels are integrated with freewheels. Through the respective freewheel can be integrated with freewheels. Through the respective freewheel can be integrated with freewheels. Through the respective freewheel can be integrated with freewheels. Through the respective freewheel can be integrated with freewheels. Through the respective freewheel can be integrated with freewheels. Through the respective freewheel can be integrated with freewheels. Through the respective freewheel can be integrated with freewheels. Through the respective freewheel can be integrated with freewheels.
  • DE 11 2014 005 508 T5 discloses a wedge coupling with an inner and an outer hub.
  • the wedge coupling includes a wedge element that includes individual circumferentially distributed segments that are disposed radially between the first and outer hubs.
  • the wedge coupling further comprises an outer ring and a first and a second displacement element.
  • the ring is arranged radially between the wedge element and the outer hub and is non-rotatably connected to the segments. The ring presses the segments radially inwards until they make contact with the inner hub. For a closed mode, press the first
  • Displacement element the wedge element in a first axial direction, which is parallel to an axis of rotation of the wedge coupling, in order to connect the inner and outer hubs, the wedge element and the outer ring to one another in a rotationally fixed manner.
  • the second displacement member translates the wedge member in a second axial direction, which is opposite to the first axial direction, to allow relative rotation between the inner and outer hubs.
  • DE 1530676 A discloses a drive train of a motor vehicle with two driven axles.
  • the drive of one axis is switchable by means of a
  • Overrunning clutch can be switched on and off.
  • the overrunning clutch has a roller cage and a number of pinch rollers.
  • the inner part of the freewheel is with
  • the cage is left and right beyond the freewheel and is rotatably supported to one side. On the same side, a leaf spring is arranged, which the cage with the pinch rollers in a
  • the leaf spring is designed to be almost curved in a semicircle. In the installed position, it has spring ends at the top and bottom of the bend which are angled radially from the bend and which each engage in a bore, with which the leaf spring is held in the installed position.
  • the cage is extended to another side with a friction surface that runs in a chamber with a viscous liquid. The resistance of this fluid is set in such a way that the cage can overcome the resistance of the leaf spring from certain differential speeds between the coupling halves and the freewheel engages in a switching position.
  • Switching off a vehicle axle is provided, is based on a similar basic structure as that of the freewheel described with DE 1530676 A. In this case are Instead of the leaf spring, however, tangentially aligned helical compression springs distributed around the circumference are used, with which the freewheel is held in the freewheeling position.
  • the object of the invention is to propose a coupling element for a switchable freewheel, which is actuated by a small axial force and thereby produces a radial frictional contact between the outer ring and the cage in order to achieve a
  • this object is achieved by a coupling element for a switchable freewheel with a cage in which an omega spring is positively received, the omega spring being in operative connection in a first operating state with a component surrounding the cage and in a second operating state from the further component is separated, the omega-spring being transferred from the first operating state to the second operating state by deformation.
  • an omega spring is one
  • Coupling element can be interrupted.
  • the spring characteristics of an omega spring can be set more easily and more reproducibly than with a corrugated spring or a helical spring. Another benefit is that when active
  • Activation is completely separated from the component surrounding the omega spring. In this way, the frictional losses during power interruption can be prevented. Furthermore, the space used for this spring is less than that of a wave spring or a helical spring.
  • a friction surface is formed on an outside of the omega spring, the
  • Friction surface is pressed against a component surrounding the cage, so that a non-positive connection is established between the cage and the component.
  • a friction surface can be used in a simple and easily reproducible manner
  • Frictional connection between the omega spring of the coupling element and the surrounding component can be established. It is preferred if the
  • Friction surface has a convex shape. Due to the convex shape, the
  • the spring tolerances can be selected to be relatively large, since the friction surface can compensate for contact errors on the component surrounding the omega spring.
  • legs are formed on the omega spring, in which an actuation pin can engage in such a way that the fleas of the omega spring is reduced by elastic deformation.
  • an actuation pin can engage in such a way that the fleas of the omega spring is reduced by elastic deformation.
  • a reversible, elastic deformation of the omega spring can be controlled in a simple manner by means of the legs.
  • a separation of the friction surface of the omega spring from the component surrounding the omega spring can thus be achieved in a functionally reliable manner.
  • the force with which the friction surface of the omega spring is pressed against the component surrounding the omega spring can also be varied in order to make the coupling process even smoother.
  • the omega-spring has convex bearing surfaces on each of its end sections, which rest against a base of the recess in the cage.
  • the convex bearing surfaces can compensate for tolerances on the base surface of the recess of the cage, and a convex bearing surface enables elastic deformation with comparatively little effort, which makes it easier to separate the friction surface from the component surrounding the omega spring in the radial direction.
  • a switchable freewheel with an outer ring, an inner ring that can be rotated relative to the outer ring and a cage is proposed, which is arranged between the outer ring and the inner ring.
  • the switchable freewheel further comprises a coupling element according to the invention and a
  • Actuating element which can come into operative connection with the coupling element and which can transfer the coupling element from the first operating state to the second operating state.
  • a switchover between a freewheel function and a clamping function can take place in a simple manner.
  • the cage can by a speed difference between the
  • actuation pins are formed on the actuating element, which come into operative connection with the omega spring in the event of an axial displacement and cause the omega spring to deform, such that a friction surface of the omega spring of an inner surface of the outer ring is separated and a gap is created between the friction surface and the outer ring. Actuation pins enable simple and
  • a reversible, elastic deformation of the omega springs can be controlled in a material-friendly manner, with the contact being released from a certain distance
  • the ramp contour allows tolerances on the legs of the omega springs to be compensated for, so that with a complete
  • Pushing in the actuation pins ensures that the friction surfaces detach from the inside of the outer ring and that a gap is created.
  • the actuation pins are conical or have a ramp contour which engages in the legs of the omega spring.
  • the actuation element comprises an activation ring, the actuation pins being molded or formed on the activation ring.
  • Actuating element are compressed and push the activation ring back into its starting position after activation has ended.
  • a return force can be generated in a simple manner, which pushes the activation ring back into its starting position after the activation via the actuator has ended.
  • a further actuator or a complex actuator can therefore be dispensed with, which means that the costs for the switchable freewheel can be reduced.
  • the return springs are designed as spiral springs, with spring domes formed on the cage and / or on the activation ring, on which the return springs are positively received.
  • spring domes formed on the activation ring and / or the cage, springs can be received in a form-fitting manner in a simple and inexpensive manner. This prevents the return springs from slipping.
  • the restoring force can be targeted the activation ring are exercised, whereby tilting or jamming of the activation ring is avoided.
  • the invention also relates to an omega spring with a tensioning element for
  • Pushing the clamping element into the omega spring causes a defined reversible, elastic deformation of the omega spring.
  • a deformation of the omega spring can thus be achieved in a simple manner in order to bring the omega spring, in particular the friction surface of the omega spring, into contact with another component and to control the forces which can be transmitted by means of frictional engagement.
  • the legs of the omega spring form a ramp contour for the tensioning element on which the tensioning element is received in a frictionally engaged manner in order to exert a defined expanding force on the omega spring. This allows a defined
  • Deformation of the omega spring can be achieved with tight shape and position tolerances.
  • the ramp contour is dependent on the insertion path of the
  • Clamping element a defined introduction of force possible, whereby a targeted
  • Deformation of the omega spring is achieved and the degree of deformation is much more accurate than with a helical spring.
  • the frictional engagement between the tensioning element and the legs of the omega spring is improved by the ramp contour, which means that higher forces can be used for deformation or the degree of deformation can be controlled in a targeted and repeatable manner.
  • FIG. 1 shows an embodiment of a coupling element according to the invention and an actuator for actuating such a coupling element
  • Fig. 2 shows an omega spring and an actuation pin for deforming the
  • FIG. 1 an embodiment of a coupling element 5 according to the invention for a switchable freewheel 1 is shown.
  • the coupling element 5 comprises an omega spring 6, which is positively received in a recess of a cage 14.
  • the omega spring 6 is surrounded in the radial direction by an outer ring 15 of the switchable freewheel 1.
  • a friction surface 8 of the Omega spring rests against the inside of the outer ring 15 in an unloaded initial state of the coupling element 5.
  • the omega spring 6 has two legs 7 into which an actuation pin 3 with a ramp contour 4 can penetrate and control a deformation of the omega spring 6.
  • the omega spring 6 also has a convex bearing surface 11 in each of its end sections 9, 10 which rests on a base of the recess of the cage 14.
  • the ramp contours 4 come into contact with the legs 7 of the omega spring 6, the omega spring 6 being compressed in the radial direction so that the fleas of the omega spring 6, i.e. the expansion between the convex bearing surfaces 11 up to the Friction surface 8, reduced. A gap 17 is thus created between the friction surface 8 and the outer ring 15.
  • a switchable freewheel 1 with an actuator for actuating such a coupling element 5 is shown in a sectional illustration in FIG.
  • the switchable freewheel 1 comprises an outer ring 15 and one relative to the outer ring 15 rotatable inner ring 16 and a cage 14 which is arranged in the radial direction between the outer ring 15 and the inner ring 16.
  • the switchable freewheel 1 also comprises a coupling element 5 and an actuating element 2, which can come into operative connection with the coupling element 5.
  • Actuating element 2 comprises an activation ring 12, on which actuation pins 3 protruding in the axial direction from the annular basic shape in the direction of the cage 14 are formed. Furthermore, spring domes are formed on the activation ring 12, on which return springs 13 are received.
  • the actuating element 2 is controlled in the axial direction with a
  • an omega spring 6 of a coupling element 5 according to the invention is shown in a three-dimensional representation.
  • the omega spring 6 has a friction surface 8 on its radially outer side.
  • the omega spring 6 also has two legs 7 which are formed by the flanks of the omega spring 6.
  • the omega spring 6 also has two end sections 9, 10 which have a convex shape, as a result of which the omega spring 6 can compensate for shape and positional tolerances. Furthermore, due to the convex shape of the end sections 9, 10, the spring travel can be increased.
  • FIG. 2 a section of an activation ring 12 is shown in FIG. 2, onto which an activation pin 3 which runs out in a ramp-shaped manner from the activation ring is formed.
  • an activation pin 3 which runs out in a ramp-shaped manner from the activation ring is formed.
  • several actuation pins 3 are evenly spaced over the circumference of the Activation ring 12 distributed, each of the actuation pins 3 engaging in the legs 7 of an omega spring 6.
  • Coupling element 5 exercised.
  • the legs 7 are pressed together in the direction of the cage 14 and the radial force between the friction surfaces 8 and the outer ring 15 is released.
  • the coupling element 5 is no longer in contact with the outer ring 15 and torque is no longer transmitted from the outer ring 15 to the coupling element 5 or from the coupling element 5 to the outer ring 15.
  • the radial pretensioning force of the coupling element 5 can be interrupted via an axial actuation of the actuator.
  • a further advantage results from the fact that no power loss is generated during active actuation, since the coupling elements 5 are completely separated from the outer ring 15 by the gap 17.
  • the actuating element 2 is moved back into its starting position in the axial direction by the return springs 13.
  • the ramp contours 4 of the actuation pins 3 are pulled out of the legs 7 of the omega springs 6, the omega springs 6 expanding again in the radial direction and coming into contact with the inner surface of the outer ring 15.
  • the coupling element 5 is again frictionally engaged with the
  • Outer ring 15 in contact and a torque can be transmitted from the outer ring 15 to the cage 14 or from the cage 14 to the outer ring 15. If the actuator is not actuated, the coupling element 5 is in permanent contact with the Outer ring 15. A torque can be transmitted from outer ring 15 to cage 14 or the other way around in both directions of rotation.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)

Abstract

L'invention concerne un élément d'accouplement (5) pour une roue libre commutable (1), comportant une cage (14) dans laquelle est logé un ressort oméga (6) par complémentarité de forme, le ressort oméga (6) coopérant dans un premier état de fonctionnement avec un autre élément structural (15) entourant la cage (14) et étant séparé dudit autre élément structural (15) dans un second état de fonctionnement, le ressort oméga passant du premier au second état sous l'effet d'une déformation. L'invention concerne en outre une roue libre commutable (1) comportant une bague extérieure (15) une bague intérieure (16) pouvant tourner relativement à la bague extérieure (15) et une cage (14) qui est montée entre la bague extérieure (15) et la bague intérieure (16), la roue libre commutable comportant également un tel élément d'accouplement (5) et un élément d'actionnement (2) qui peut entrer en coopération avec l'élément d'accouplement (5) et peut faire passer l'élément d'accouplement (5) du premier état de fonctionnement au second état de fonctionnement.
PCT/DE2020/100473 2019-06-28 2020-06-05 Élément d'accouplement pour une roue libre commutable dotée d'un ressort oméga et roue libre commutable munie d'un élément d'accouplement WO2020259747A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019117528.3 2019-06-28
DE102019117528.3A DE102019117528B3 (de) 2019-06-28 2019-06-28 Kupplungselement für einen schaltbaren Freilauf mit einer Omega-Feder und schaltbarer Freilauf mit einem Kupplungselement

Publications (1)

Publication Number Publication Date
WO2020259747A1 true WO2020259747A1 (fr) 2020-12-30

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PCT/DE2020/100473 WO2020259747A1 (fr) 2019-06-28 2020-06-05 Élément d'accouplement pour une roue libre commutable dotée d'un ressort oméga et roue libre commutable munie d'un élément d'accouplement

Country Status (2)

Country Link
DE (1) DE102019117528B3 (fr)
WO (1) WO2020259747A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1530676A1 (de) 1964-02-27 1969-04-10 Eaton Yale & Towne Kraftfahrzeugantrieb
DE1811454A1 (de) 1967-11-30 1969-07-24 Eaton Yale & Towne Fahrzeugantrieb
US5036939A (en) 1987-08-28 1991-08-06 Polaris Industries L.P. Multiple axle drive vehicle with overrunning roller clutch hubs
US20050236246A1 (en) * 2004-04-21 2005-10-27 Timken Us Corporation Secondary driven axle control
JP2006322612A (ja) * 2005-04-22 2006-11-30 Kazuo Ishikawa ワンウェイクラッチ
JP4713479B2 (ja) * 2003-09-10 2011-06-29 ブローゼ・ファールツォイクタイレ・ゲーエムベーハー・ウント・コンパニ・コマンディットゲゼルシャフト・コーブルク 二側回転運動を生じさせるための調節装置
DE102012217927A1 (de) 2012-10-01 2014-04-03 Schaeffler Technologies Gmbh & Co. Kg Freilauf
DE112014005508T5 (de) 2013-12-03 2016-09-22 Schaeffler Technologies AG & Co. KG Keilkupplung mit einem segmentierten Keilelement und schrägen Eingriffsflächen
DE102017128198A1 (de) * 2016-12-23 2018-06-28 Schaeffler Technologies AG & Co. KG Schaltvorrichtung mit Freilauffunktion für ein Getriebe sowie Getriebe mit der Schaltvorrichtung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1530676A1 (de) 1964-02-27 1969-04-10 Eaton Yale & Towne Kraftfahrzeugantrieb
DE1811454A1 (de) 1967-11-30 1969-07-24 Eaton Yale & Towne Fahrzeugantrieb
US5036939A (en) 1987-08-28 1991-08-06 Polaris Industries L.P. Multiple axle drive vehicle with overrunning roller clutch hubs
JP4713479B2 (ja) * 2003-09-10 2011-06-29 ブローゼ・ファールツォイクタイレ・ゲーエムベーハー・ウント・コンパニ・コマンディットゲゼルシャフト・コーブルク 二側回転運動を生じさせるための調節装置
US20050236246A1 (en) * 2004-04-21 2005-10-27 Timken Us Corporation Secondary driven axle control
JP2006322612A (ja) * 2005-04-22 2006-11-30 Kazuo Ishikawa ワンウェイクラッチ
DE102012217927A1 (de) 2012-10-01 2014-04-03 Schaeffler Technologies Gmbh & Co. Kg Freilauf
DE112014005508T5 (de) 2013-12-03 2016-09-22 Schaeffler Technologies AG & Co. KG Keilkupplung mit einem segmentierten Keilelement und schrägen Eingriffsflächen
DE102017128198A1 (de) * 2016-12-23 2018-06-28 Schaeffler Technologies AG & Co. KG Schaltvorrichtung mit Freilauffunktion für ein Getriebe sowie Getriebe mit der Schaltvorrichtung

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