WO2009056092A1 - Reibungskupplung - Google Patents
Reibungskupplung Download PDFInfo
- Publication number
- WO2009056092A1 WO2009056092A1 PCT/DE2008/001663 DE2008001663W WO2009056092A1 WO 2009056092 A1 WO2009056092 A1 WO 2009056092A1 DE 2008001663 W DE2008001663 W DE 2008001663W WO 2009056092 A1 WO2009056092 A1 WO 2009056092A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure plate
- friction clutch
- clutch
- lever system
- control device
- Prior art date
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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D13/00—Friction clutches
- F16D13/58—Details
- F16D13/75—Features relating to adjustment, e.g. slack adjusters
- F16D13/757—Features relating to adjustment, e.g. slack adjusters the adjusting device being located on or inside the clutch cover, e.g. acting on the diaphragm or on the pressure plate
Definitions
- the invention relates to a friction clutch with a pressure plate and an axially limited veriagerbaren acted upon by a lever pressure plate for producing a frictional engagement with friction linings of a clutch disc, wherein depending on the wear an adjustment of the friction clutch with a readjustment of the lever system.
- Friction clutches with adjusting devices are known.
- such an adjusting device can be force-controlled.
- lever system such as a plate spring
- a fault occurring between the clutch housing and the lever system when the friction linings of the clutch disc wear out can be determined and corrected as a function of a fault clearance.
- compensation means arranged between the pressure plate and the lever system such as ramp systems or threads, are twisted.
- the object of the invention is therefore to propose a friction clutch with a robust, easy to manufacture and adjustable readjustment.
- a friction clutch which consists at least of a clutch housing with a rotatably and axially limited to this movable pressure plate, which is axially displaceable by a clutch housing fixed to the lever against a clutch housing fixed pressure plate under tension of friction linings of a clutch disc in which, depending on a change in a distance between the pressure plate and pressure plate, a positive connection between a twisting device which rotates between a pressure plate and the lever system arranged ramp system to compensate for occurring during wear gap between the pressure plate and lever system, and a control device, which means the twisting by means of Form fit controls, takes place and the turning means by means of the control device at a displacement of the pressure plate in the direction of the lever system, for example when opening the Reibungsku coupling, is twisted.
- a lever system is to be understood as a lever device which is supported on the clutch housing to form a one-armed or two-armed lever, depending on the embodiment of the friction clutch.
- the lever is clamped axially against the housing by means of one or more energy accumulators. to be able to apply a contact force against the pressure plate, whereby it is axially braced to form a frictional engagement with the friction linings of a clutch disc with a pressure plate, which may be formed as Einmassenschwungrad or as a secondary part of a dual mass flywheel.
- the lever system may be formed as a plate spring, which serves as an energy storage means of a radially outer edge of force and radially inwardly by means of disc spring tongues can be acted upon axially as a lever.
- a plate spring which serves as an energy storage means of a radially outer edge of force and radially inwardly by means of disc spring tongues can be acted upon axially as a lever.
- the twisting device can be accommodated on the pressure plate, for example, a sheet holder can be riveted to the pressure plate, by means of which the twisting device is added.
- the twisting device can be designed in such a way that a force transmitted axially from the control device to the twisting device is deflected by means of a gear in a force acting on the ramp system in the circumferential direction.
- the turning device can be a spindle which is received rotatably on the pressure plate and which is driven by the control device and accommodates a spindle nut which engages in a form-fitting manner in an annularly configured ramp system.
- the ramp system can be, for example, a ramp ring with axially formed, distributed over the circumference ramps, which interacts with the pressure plate correspondingly formed or mounted counter ramps, so that the axial height upon rotation of the ramps in the direction of the opposite ramp slopes of ramp ring and counter ramps increases.
- the ramp ring can, for a positive engagement of the spindle nut, have a number of recesses corresponding to the number of engagement means with which the engagement means form a positive connection.
- the engagement means provided on the spindle nut for example, be formed from the material of these, dome-shaped, spherical or similarly shaped profiles which engage pivotably in the recesses, so that in a linear displacement of the spindle nut along the spindle, the profiles of these in a circular arc twisted recesses can pivot in accordance with the recesses or shift with a radial clearance in the recesses.
- the profiles may have an outer radius, which are adapted to a circular arc-shaped configuration of the recesses and to the relative rotation of the spindle nut and ramp ring, so that they rotate against each other positively and without play against each other in an adjustment process.
- the control device and the twisting device interact positively with one another in the case of adjustment. It is advantageous if the control device is attached to the clutch housing, so that during assembly, the clutch housing with lever system and control device and the pressure plate with ramp system can be partially assembled as mutually independent modules.
- the turning device with the spindle and the drive wheel rotatably mounted thereon are then brought into contact with the control device with a control part.
- the drive wheel has a circumferential profile, for example on the outer circumference or an axially offset smaller radius distributed over the circumference of teeth, which can be designed to better educate a positive engagement with the control device sawtooth of the pressure plate pioneering.
- a pawl which is displaced for adjustment in the direction of the pressure plate and drives the drive wheel so that the spindle is rotated and the spindle nut axially displaced on the spindle, which in turn the ramp ring relative to the pressure plate which is rotated from the matched translations by a predetermined amount and provides for axial compensation of the resulting by abrasion of the friction linings and / or other effects such as setting the friction linings or other components of the friction clutch misalignment.
- the pawl of the control device is brought under pretension with the circumferential profile of the drive wheel in contact.
- the module with the pressure plate is already pre-adjusted to the clutch disc to be used.
- a positive connection between the control device and the twisting device takes place only when there is wear to be compensated. This is done by the positive connection between the pawl of the control device and circumferential profile of the drive wheel in dependence on the distance between the clutch cover and pressure plate, ie path-dependent, is produced.
- the control device with the pawl is axially positioned on the clutch cover, while the drive wheel of the twisting device axially with increasing wear away from the pawl.
- the distance between pawl and drive wheel is designed so that in the absence of wear, the pawl bears on the outer circumference of the peripheral profile under pretension and at a distance of the pressure plate te axially over a profile edge, such as a tooth head, is moved out, so that the pawl engages the bottom of the profile, for example, the tooth base, so that forms a positive connection between pawl and circumferential profile in the direction of movement on the pressure plate. If the friction clutch is now opened, that is, the contact pressure of the lever system is reduced, displaced due to the restoring force of the leaf springs, the pressure plate and thus the twisting device with spindle and drive against the pawl, which rotates due to the positive engagement of the drive wheel and the ramp system is rotated.
- the energy storage between the pressure plate and clutch housing are designed so that upon displacement of the pressure plate in the disengaged position of the friction clutch, the latched in the drive wheel pawl is taken in a blocking of the drive wheel in the disengagement position.
- the pawl is axially elastically received relative to the housing so that the friction clutch can be safely opened even when the adjusting device is blocked.
- control device may be formed of a end connected to the coupling housing, in the direction of the pressure plate elastic and biased spring element with a pawl.
- the spring constant of the spring element is designed so that the spring element provides for a provision of the pressure plate under normal conditions in the adjusting case for a rotation of the drive wheel, but is elastically clamped at not yet possible rotation, for example as a result of friction friction befindlichem friction linings against its spring constant, which leads to an increase in the bias and a return displacement of the pawl.
- the spring element is biased in an advantageous manner in its original position against an axial stop, which sets the pawl at a reproducible position.
- the stiffness of the spring element At least by tuning the stiffness of the spring element, the necessary force for rotating the ramp system force, the rigidity of the effective between the pressure plate and the clutch housing energy storage can thus with a relaxation of the contact pressure of the lever system - that is already achieved when opening the friction clutch - and in the presence of wear be that the pawl in positive engagement with the circumferential profile, a rotation of the drive wheel is securely effected, even if initially clamped adjustment first the spring element caches the energy for adjustment. It has further been found that it can be advantageous if the path of readjustment while the friction clutch is being opened is limited.
- a defined Nachstellweg can be specified. It is particularly advantageous if this path is made dependent on a distance traveled by the lever system.
- the spring element can be taken by the lever system against the direction to the pressure plate in an advantageous manner when exceeding a in the relaxation of the lever system of this covered, predetermined path.
- the action of the spring element by means of the pawl is stopped immediately when the path is exceeded.
- Another advantage of canceling the Nachstelleingriffs is an overuse of the leaf springs in jammed or difficult to use twisting device and / or ramp system, which could lead to a non-permanent or reduced displacement of the pressure plate when opening the friction clutch.
- the adjustment can be an erecting lever member acting on the spring element axially and take this axially against the direction of the pressure plate.
- a contact surface or a stop can be formed on the lever part and / or on the spring element.
- a further embodiment may provide that the lever system after exceeding the path in abutting contact with a second stop occurs, wherein the first and second stop are spaced from each other at a predetermined distance, so that by entrainment of the second stop the first stop for the spring element is taken axially and thus the spring element lying on the first stop.
- the two stops are arranged on a relative to the clutch housing axially against the action of an energy storage device movable component. This energy store can in turn be the spring element, so that with a small number of components both stop functions, or the control device together with their travel limit can be displayed.
- FIGS. 1 to 3 show a schematic illustration of a disengagement process of a friction clutch without wear adjustment
- FIGS. 4 to 6 show a schematic illustration of a disengagement process of a friction clutch with wear adjustment
- FIG. 7 shows a schematic representation of a friction clutch with a new operating point after a wear adjustment
- FIG. 8 shows a view of an exemplary embodiment of a friction clutch with the lever system removed
- FIG. 9 shows a detail of the exemplary embodiment of FIG. 8 in section
- Figure 10 is a partial section of an embodiment of a friction clutch
- FIG. 11 shows a diagram with the force relationships between individual energy storage components during a disengaging operation of a friction clutch.
- Figure 1 shows a schematic representation of an adjusting device 1 of a friction clutch in the closed state as a sectional view.
- the rotationally fixed to the clutch housing 2 and axially connected by means not shown energy storage as leaf springs pressure plate 3 with respect to the fixed housing pressure plate 4 to a distance 5, which corresponds to the thickness of the friction linings of the clutch disc, not shown, in the clamped state, braced by the operating point 6 is shown.
- the pressure plate 3 is acted upon by the lever system 7, which is pivotally supported on the clutch housing 2 with a contact pressure, which is metered on the other side of the lever system by means of a release system, not shown, for actuating the friction clutch.
- a so-called compressed friction clutch with a two-armed lever system I 1 for example, a plate spring, which is not acted upon in the closed state of the friction clutch shown and in the open state of the release system. In the closed state, therefore, the maximum contact pressure of the lever system is applied to the pressure plate.
- a ramp system 8 is provided, which in the example shown consists of a ramp ring 9 with circumferentially distributed and circumferentially aligned ramps 11, which are incorporated in the pressure plate to these corresponding counter ramps 10. With a rotation of the ramp ring 9 relative to the pressure plate 3 in the corresponding direction, therefore, there is an increase in the distance between the lever system 7 and the pressure plate.
- the rotation system 11 For rotation of the ramp ring, the rotation system 11, which rotates in a manner not shown here at present readjustment conditions the ramp ring 8 by a predetermined angle.
- the control device 12 controls the twisting device as soon as it has been detected wear.
- a drive wheel 13 which may be formed by means of a peripheral profile 14, for example, distributed over the circumference of teeth, in which the control device 12 for rotating the drive wheel 13 by means of an axially displaceable pawl 15 for adjusting the pressure plate 3 intervenes.
- the control device 12 is formed by a clamped on the end of the clutch housing 2 spring element 16 which is braced in the direction of the pressure plate 3 against a housing-fixed stop 17 and end carries the pawl 15, which is clamped against the circumferential profile. Furthermore, a stop 18 is provided on the spring element 16, which can come into abutting contact with the lever system 7 and at large opening intervals of the friction clutch, the spring element 16 against its tension axially away from the stop 17 and thus moves the pawl 15 away from the circumferential profile 14.
- Figure 2 shows the adjusting device 1 of Figure 1 in a partially disengaged state in which, for example, the frictional engagement of the friction linings is already repealed. Wear has not yet occurred in this illustration, so that the pawl 15, as in the ground state of the closed friction clutch of FIG. 1, does not engage positively in the pawl 15 in the circumferential profile 14. Rather, when lifting the pressure plate 3 from the operating point 6 during the opening of the friction clutch, the pawl 15 slides along the circumferential profile.
- the lever system 7 is in partially extended state of the friction clutch only in abutting contact with the stop 18th
- the lever system 7 absorbs the contact which is in contact with the stop 18 via the stop 18. derelement 16 axially with and moves it away from the stop 17. Since now the pressure plate 3 - axially displaced by the effective between this and the clutch housing 2 energy storage - and the spring element 16 are displaced in the same direction, the relative movement between the attached to the pressure plate 3 drive wheel 13 and attached to the spring element 16 pawl 15 takes comes to a standstill, depending on the Axialwegixien between lever system 7 and pressure plate or the difference between the charging radii of stop 18 and ramp ring. In the fully disengaged state, the pressure plate is in a disengaged from the maximum working position 19.
- the pawl 15 is already displaced along the peripheral profile 14 with closed friction clutch and engages after overcoming a profile edge 22 in a radial minimum of the peripheral profile 14 and forms with the drive wheel 13 a Form fit, which serves as preparation for an adjustment.
- the circumferential profile can be formed in a suitable manner from radially raised and radially lower lying, over the circumference of the drive wheel alternating profiles. For example, in the schematic illustration, a circumferential profile 14 with teeth 24 distributed over the circumference is shown with a sawing profile. It is understood that other profiles can be advantageous and that the drive wheel - as far as the overall th adjustment range sufficient - may be formed as a circle segment.
- FIG. 5 shows a readjustment process which follows the sensed adjustment requirement of FIG. 4 to a partially extended friction clutch.
- a compensating step after forming a positive connection is not sufficient for a complete readjustment, a positive locking of the pawl 15 with the next tooth 26 following the current tooth 25 already occurs during the next engagement with the friction clutch closed and it is readjusted again during the next disengagement. If the compensation step is sufficient, the pawl engages radially on the outside of the tooth 26 when the friction clutch is engaged, and glides on it during disengagement operations until the wear limit for the next readjustment is reached again. This adjustment process is repeated until reaching the absolute wear limit of the friction linings and the clutch disc must be replaced. In order to adapt to the thickness of the new friction linings, in principle, the turning device can be turned back, if the positive connection with the pawl 15 is thereby removed as long.
- the stiffness of the spring element 16 is designed so that a displacement of the pawl 15 away from the stop 17 away a smaller force is necessary than by the energy storage between the clutch housing 2 and pressure plate 3 is applied to displace this, so that although an adjustment does not occur the friction clutch can still be operated.
- Figure 6 shows the principle of limiting the Nachstellweges completely disengaged friction clutch. After exceeding a path of the pressure plate 3, which is in principle sufficient for separating the friction engagement and has been described under Figure 5, up to a maximum Ausgurweg.
- an axial relative movement of pawl 15 and drive wheel 13 is prevented during a readjustment with the desired Nachstellweg or angles beyond axially extending opening process by the lever system 7 by the lever system 7 axially located in abutting contact with the lever system 7 stop 18, so that the spring element is lifted from the stop 17.
- FIG. 7 shows the adjusting device 1 in the closed state acted upon by the lever system 7 with the maximum pressure force.
- the original operating point 6 has changed to the new operating point, which corresponds to the original wear position 20, and adapted to the new distance 5 with thinner friction linings.
- a greater distance was set by rotating the ramp ring 8 between the lever system 7 and the pressure plate 3, which returns the lever system to its original position.
- the spring element 16 with the pawl 15 has assumed its original position and is now located radially on the outside of the originally current tooth 25 in the direction of rotation subsequent tooth 26 radially outward.
- Figure 8 shows an advantageous embodiment of a pressure plate 27 with a ramp system 28 and a twisting device 29.
- the pressure plate 27 has known elements for receiving the coupling housing, for example molded and optionally reworked receptacles 30 with openings 31 for attachment of energy storage such as leaf springs, the one allow rotationally fixed and axially displaceable connection to the coupling housing, wherein a bias of the energy storage takes place in such a way that the pressure plate 27 is closed against the action of the energy storage by force of the lever system and after reduction of the contact pressure by the lever system by the relaxing effect of energy storage in the open position returns.
- the openings 32 can be used in many ways and can serve, for example, for attaching an additional mass serving as an absorber mass, which can be displaced axially relative to the pressure plate.
- counter-ramps 33 distributed over the circumference are incorporated on a predetermined radius, which can already be formed and machined in a representation of the pressure plate 27 in a forging process in the blank.
- a pressing part or a plastic part can be placed and fastened on the pressure plate.
- a ramp ring 34 of corresponding diameter is placed with ramps 35 corresponding to the circumference on the counter ramps 33, which has an annular surface 36 which forms a contact surface for the lever system.
- the ramp ring 34 can be fixed secured against loss on the counter ramps 33 at least for assembly.
- the lever system and the coupling housing are installed immediately after placing the ramp ring.
- the twisting device 29 for the ramp ring 34 is received on the pressure plate 27 by means of a receiving device 37, which may be formed from a sheet metal bracket and riveted to the pressure plate 27 or secured in any other way.
- a spindle 38 is mounted, on which a spindle nut 40 secured to the spindle thread 39 against rotation, for example by means of a flat contact with the receiving device 37, is added.
- the drive wheel 41 is arranged rotationally fixed, for example by means of a polygon. The drive wheel 41 may also be attached in another way or be made directly from the spindle similar to a screw with a head.
- a circumferential profile 42 for example, a toothing, introduced, for example, rolled up.
- the spindle nut 40 engages by means of an outer profile 43 positively in recesses 44 of the ramp ring 34 a.
- the spindle 38 with the spindle thread 39 whose pitch is designed so that a rotation of the spindle nut 40 is self-locking, twisted and the spindle nut 40 axially displaced along the spindle 38.
- FIG. 9 shows the twisting device 29 of FIG. 8 in detail as a sectional view with the spindle 38, the spindle nut 40, the drive wheel 41 and the receiving device 37.
- the twisting device 29 generates a linear longitudinal movement of the spindle nut 40 during a rotation of the spindle 38 is, however, rotated in a circular motion on the pressure plate 27.
- the outer profiles 43 of the spindle nut 40 and the recesses 44 of the ramp ring 34 are formed accordingly.
- the outer profiles are provided at their ends with a radius 45 adapted to the changing angle, and on the other hand, the recesses 44 have a clearance 46 which allows the outer profiles to engage obliquely in the recesses with increasing adjustment angle.
- FIG 10 shows a partial section of an embodiment of a friction clutch 47 along through its axis of rotation 48, wherein only one half is shown with the adjusting device 49.
- the friction clutch 47 is formed from a clutch housing 50, in which a pressure plate 27 by means not visible in this section energy storage rotatably and axially displaceable added.
- a lever system 51 is received in the clutch housing 50 as a plate spring 52 having radially inner plate spring tongues 53 which are axially displaced by a release system, not shown.
- the embodiment shown is a depressed friction clutch 47, which is disengaged by pressing the plate spring tongues 53.
- the plate spring 52 by means of two wire rings 54, 55 on the clutch housing pivotally supported by not shown, both rings against each other bracing rivets supported to form a two-armed lever, wherein the radially outer force edge 56, the pressure plate 27 against a pressure plate, not shown under tension of also not shown Clamped friction linings.
- the ramp ring 34 is clamped between the pressure plate 27 and the plate spring 52, which, as shown in FIG. 8, cooperates with the pressure plate 27 and the twisting device 29 with the drive wheel 41.
- the control device 57 is formed by the spring element 58, which is attached to the radially extending cover part of the coupling housing 50 and an axially bent part, the Pawl 59 forms, which is radially clamped against the drive wheel 41.
- the stopper 60 which limits the prestressed spring element 58 in the direction of the pressure plate 27, is formed by a bolt 61 or rivet, which passes through the spring element 58 and forms an axial stop for the spring element 58 by means of a head 62.
- the pin 61 is axially limited against a stop 63 displaceably received in the clutch housing 50, so that when a loading of the head 62 by a ganfikiee 64 of the plate spring 52 at a large release travel of the friction clutch 47 of the pin 61 a- xial against the Biasing force of the spring element 58 is displaced, whereby this is taken and an optionally occurring adjustment is completed.
- the function of adjusting the friction clutch 47 largely corresponds to the schematic representation of FIGS. 1 to 7.
- FIG. 11 shows a diagram in which qualitatively a possible form of the development of the forces of individual energy storage components as a function of the stroke of the pressure plate is shown.
- the graph 65 shows the force of the energy storage between the pressure plate and the clutch housing, which is often shown in the form of several, for example, three, distributed over the circumference leaf springs.
- the development of the force over the stroke of the printing plate decreases slightly.
- the absolute force is higher than the effective ratchet force shown in graph 66 to ensure that the friction clutch is opened as the pressing force of the lever system decreases.
- the effective latching force is determined by the bias of the spring element.
- Graph 67 represents the force of the latch bias when the twister is blocked.
- the biasing force of the spring element adds to the latch force. This force may not exceed the force shown in the graph 65 over the entire stroke of the pressure plate, since otherwise the disengagement of the friction clutch is not ensured with blocking twisting device or with a blocking ramp system. It is understood that appropriate security surcharges are set between these forces in an advantageous manner.
- the graph 68 indicates the force behavior of the necessary for an adjustment torque. This size decreases hyperbolic with increasing stroke of the pressure plate. This can be explained by the fact that a rotation of the ramp ring is only possible if the frictional engagement between the friction linings and the pressure and pressure plate is canceled. Since the friction linings are usually connected to each other by means of a lining suspension, tehmendem stroke of the pressure plate first relax the lining suspension, wherein the frictional force on the pressure plate with decreasing pad spring force also decreases. At a stroke 69, which corresponds to a given stroke of the pressure plate, the lining suspension is degraded so far that the remaining friction force is compensated by the effective twisting force of the spring element.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112008002711.0T DE112008002711B4 (de) | 2007-10-31 | 2008-10-09 | Reibungskupplung mit Rampensystem zum Ausgleich eines bei Verschleiß auftretenden Fehlabstands zwischen Druckplatte und Hebelsystem |
CN200880024846.1A CN101952613B (zh) | 2007-10-31 | 2008-10-09 | 摩擦离合器 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007052312 | 2007-10-31 | ||
DE102007052312.4 | 2007-10-31 |
Publications (1)
Publication Number | Publication Date |
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WO2009056092A1 true WO2009056092A1 (de) | 2009-05-07 |
Family
ID=40242596
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2008/001663 WO2009056092A1 (de) | 2007-10-31 | 2008-10-09 | Reibungskupplung |
Country Status (3)
Country | Link |
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CN (1) | CN101952613B (de) |
DE (2) | DE102008051100A1 (de) |
WO (1) | WO2009056092A1 (de) |
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CN101952613A (zh) | 2011-01-19 |
DE102008051100A1 (de) | 2009-05-07 |
DE112008002711A5 (de) | 2010-07-08 |
CN101952613B (zh) | 2014-06-04 |
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