DE102019204349A1 - Pressurized fluid actuator assembly for a friction clutch - Google Patents

Abstract

Pressure fluid actuation arrangement for a friction clutch with a compensation assembly, comprising: - a first ramp element with a first ramp formation, axially supported with respect to the second actuation element in the direction of the movement axis and preloaded by a first preloading arrangement for rotation about the movement axis with respect to the second actuation element, - a first ramp formation with the rotary decoupling bearing in the direction of the movement axis movable second ramp element, wherein the second ramp element has a second ramp formation and is supported with the second ramp formation on the first ramp formation in the direction of the movement axis, wherein the second ramp element is not rotatable with respect to the second actuating element about the movement axis, and wherein, when the first ramp element rotates around the axis of movement of the first ramp element, which is generated by the first prestressing arrangement, an overall axial length of the compensation assembly decreases, between a blocking position and a release position adjustable release / blocking assembly with a blocking engagement with a blocking formation on the first actuating element in the blocking position, the release / blocking assembly being a for adjusting the release / blocking assembly from the blocking position in the release position interacts with the first actuation element entering detection area.

Description

The present invention relates to a pressurized fluid actuation arrangement such as is used, for example, in commercial vehicles in order to actuate a friction clutch.

Such pressurized fluid actuation arrangements generally comprise a cylinder which is fixedly positioned with respect to the vehicle and a piston which delimits a pressurized fluid chamber with the cylinder and is displaceable in the direction of a movement axis. The piston can act on an energy store, for example the spring tongues of a diaphragm spring, via a rotary decoupling bearing, in order to carry out clutch actuation processes in this way. With wear occurring in a friction clutch, for example the friction linings of a clutch disc, the installation position of such a diaphragm spring, which acts as an energy storage device, changes when the friction clutch is engaged, since with increasing wear, the diaphragm spring relaxes more and more when moving into the engaged state compared to a non-wear state can.

The object of the present invention is to provide a pressurized fluid actuation arrangement for a friction clutch which allows an adaptation to a wear-related change in the installation position of an energy accumulator of a friction clutch in a simple and reliable manner.

• - ein erstes Betätigungselement und ein mit dem ersten Betätigungselement eine Druckfluidkammer begrenzendes zweites Betätigungselement, wobei durch Einleitung von Druckfluid in die Druckfluidkammer das zweite Betätigungselement bezüglich des ersten Betätigungselements in einer Betätigungsrichtung entlang einer Bewegungsachse bewegbar ist, wobei vorzugsweise das zweite Betätigungselement bezüglich des ersten Betätigungselements um die Bewegungsachse nicht drehbar ist,
• - ein mit dem zweiten Betätigungselement über eine Kompensationsbaugruppe zur gemeinsamen Bewegung in Richtung der Bewegungsachse gekoppeltes D rehentkopplu n g slager,

wobei die Kompensationsbaugruppe umfasst:

• - ein bezüglich des zweiten Betätigungselements in Richtung der Bewegungsachse axial abgestütztes, durch eine erste Vorspannanordnung zur Drehung um die Bewegungsachse bezüglich des zweiten Betätigungselements vorgespanntes erstes Rampenelement mit einer ersten Rampenformation,
• - ein zusammen mit dem Drehentkopplungslager in Richtung der Bewegungsachse bewegbares zweites Rampenelement, wobei das zweite Rampenelement eine zweite Rampenformation aufweist und mit der zweiten Rampenformation an der ersten Rampenformation in Richtung der Bewegungsachse abgestützt ist, wobei das zweite Rampenelement bezüglich des zweiten Betätigungselements um die Bewegungsachse nicht drehbar ist, und wobei bei durch die erste Vorspannanordnung erzeugter Drehung des ersten Rampenelements bezüglich des zweiten Rampenelements um die Bewegungsachse eine axiale Baulänge der Kompensationsbaugruppe abnimmt,
• - eine zwischen einer Blockierstellung und einer Freigabestellung verstellbare Freigabe/Blockier-Baugruppe mit einer in der Blockierstellung in Blockiereingriff mit einer Blockierformation am ersten Betätigungselement stehenden Gegen-Blockierformation, wobei die Freigabe/Blockier-Baugruppe einen zum Verstellen der Freigabe/Blockier-Baugruppe von der Blockierstellung in die Freigabestellung in Wechselwirkung mit dem ersten Betätigungselement tretenden Erfassungsbereich aufweist.

According to the invention, this object is achieved by a pressurized fluid actuation arrangement for a friction clutch, comprising

• - A first actuating element and a second actuating element delimiting a pressure fluid chamber with the first actuating element, the second actuating element being movable with respect to the first actuating element in an actuating direction along a movement axis by introducing pressure fluid into the pressure fluid chamber, the second actuating element preferably being movable with respect to the first actuating element the axis of movement cannot be rotated,
• - a rotary coupling bearing coupled to the second actuating element via a compensation assembly for joint movement in the direction of the movement axis,

wherein the compensation assembly comprises:

• a first ramp element with a first ramp formation, which is axially supported with respect to the second actuating element in the direction of the movement axis and is prestressed by a first pretensioning arrangement for rotation about the movement axis with respect to the second actuating element,
• - A second ramp element movable together with the rotary decoupling bearing in the direction of the movement axis, the second ramp element having a second ramp formation and being supported with the second ramp formation on the first ramp formation in the direction of the movement axis, the second ramp element not being around the movement axis with respect to the second actuating element is rotatable, and wherein when the first ramp element rotates around the axis of movement, which is generated by the first biasing arrangement, an axial length of the compensation assembly decreases,
• - A between a blocking position and a release position adjustable release / blocking assembly with a standing in the blocking position in blocking engagement with a blocking formation on the first actuating element counter-blocking formation, the release / blocking assembly one for adjusting the release / blocking assembly of the Has blocking position in the release position in interaction with the first actuating element entering detection area.

In the construction of a pressurized fluid actuation arrangement according to the invention, excessive movement of the second actuating element with respect to the first actuating element caused by wear in a friction clutch is detected by interaction of the release / blocking assembly with the first actuating element and only if such excessive movement is detected , the first ramp element is released to carry out an adjustment movement. This readjusting movement has the consequence that the overall axial length of the compensation assembly comprising the two ramp elements decreases and accordingly an energy storage device of a friction clutch, for example a diaphragm spring, is given the opportunity to expand further to an extent corresponding to the wear that has occurred when the friction clutch is engaged relax. With a pressurized fluid actuation arrangement constructed in this way, due to a minimized dead volume of the pressurized fluid chamber, improved regulation and, in particular, improved dynamics when performing clutch actuation processes is achieved.

For a uniform actuation effect, it is proposed that the first actuation element be a cylinder, preferably a ring cylinder, and that the second actuating element is a piston, preferably an annular piston.

In particular in the case of a ring-like configuration of the two actuating elements, it is advantageous if the first ramp element is configured in a ring-like manner and has at least one, preferably a plurality of first ramp formations extending in the circumferential direction, and the second ramp element is configured in a ring-like manner and at least one, preferably a plurality of, in the circumferential direction having extending second ramp formations.

To act on the first ramp element to carry out readjustment processes, the first preloading arrangement can comprise a first preloading spring extending in the circumferential direction around the axis of movement, the first preloading spring being supported with one of its end regions with respect to the second actuating element and with the other of its end regions being supported with respect to the first ramp element is.

In order to provide a movement coupling between the second ramp element and the rotary decoupling bearing and at the same time also to ensure a defined positioning of the various system components for performing an adjustment process, it is proposed that the second ramp element be coupled to the second actuating element in a rotationally fixed manner and movable relative to it in the direction of the movement axis.

The second actuating element can be biased by a second biasing arrangement with respect to the first actuating element in the direction of the axis of movement in the actuating direction. This second pretensioning arrangement also counteracts a relaxing force accumulator and thus creates an equilibrium of forces when a friction clutch is engaged.

For a defined interaction between the release / blocking assembly and the first ramp element, it is proposed that the release / blocking assembly comprises a release / blocking element which can be displaced on the second actuating element between the blocking position and the release position essentially in the direction of the movement axis, wherein the release / blocking element is assigned a third biasing arrangement for biasing the release / blocking element with respect to the second actuating element into its blocking position.

A spatial separation of the functions of blocking / releasing on the one hand and detecting excessive movement of the second actuating element with respect to the first actuating element on the other hand can be achieved in that the releasing / blocking element is arranged on an axial side of the second actuating element facing away from the first actuating element and the Counter-blocking formation having release / blocking portion and a second actuating element penetrating and protruding on an axial side of the second actuating element facing the first actuating element for detection interaction with the first actuating element detection portion of the detection area.

In order to bias the release / blocking element in a defined manner into its position ready for the detection of an excessive movement of the second actuating element, it is proposed that the third biasing arrangement be one which is supported with respect to the detection section and the second actuation element and which is to be biased towards the first actuation element Includes bias spring.

In an alternative embodiment, in which the release / blocking assembly is provided in principle detached from the second actuating element, the release / blocking assembly can have a release / blocking element arranged on an axial side of the second actuation element facing away from the first actuation element with a ring-like one Release / blocking element body, wherein the release / blocking element is assigned a third biasing arrangement for biasing the release / blocking element body in a release direction opposite to the actuation direction towards the second actuation element.

For the release / blocking interaction with the first ramp element, a release / blocking area having the counter-blocking formation can be provided on the release / blocking element body. Furthermore, in order to detect excessive axial movement of the second actuating element induced by excessive wear of a friction clutch on the release / blocking element body, the detection area that interacts with the first actuating element can be provided.

For a structure that is easy to implement, it is proposed that the release / blocking area comprises a release / blocking part which is fixed to the release / blocking element body and has the counter-blocking formation, and that the detection area comprises one of the ring-like release / blocking Element body for detection interaction with the first Actuating element comprises radially outwardly protruding detection portion.

A stable blocking effect can be achieved in that the blocking formation on the first ramp element comprises a blocking toothing which surrounds the movement axis at least partially in a ring-like manner and is oriented axially in the direction away from the first actuating element, and the counter-blocking formation on the release / blocking assembly has an axially to be oriented in the direction of the first actuating element and by axial displacement of the release / blocking assembly with respect to the second actuating element in and out of blocking engagement with the blocking teeth includes counter-blocking teeth.

The invention also relates to a clutch system, comprising a friction clutch with an energy store which can be acted upon by a pressure fluid actuation arrangement according to one of the preceding claims for carrying out clutch actuation processes.

• 1 eine Teil-Längsschnittansicht einer Druckfluid-Betätigungsanordnung für eine Reibungskupplung;
• 2 eine Querschnittansicht der Druckfluid-Betätigungsanordnung der 1, geschnitten längs einer Linie II-II in 1;
• 3 eine perspektivische Ansicht eines Freigabe/Blockier-Elements;
• 4 die Druckfluid-Betätigungsanordnung der 1 in einem mit Druckfluid beaufschlagten Zustand;
• 5 die Druckfluid-Betätigungsanordnung der 1 in einem mit geringem Verschleiß behafteten Zustand einer Reibungskupplung;
• 6 die Druckfluid-Betätigungsanordnung der 1 in einem mit stärkerem, zu kompensierendem Verschleiß behafteten Zustand einer Reibungskupplung;
• 7 eine Längsschnittansicht einer alternativen Ausgestaltungsart einer Druckfluid-Betätigungsanordnung für eine Reibungskupplung;
• 8 eine Querschnittansicht der Druckfluid-Betätigungsanordnung der 7, geschnitten längs einer Linie VIII-VIII in 7;
• 9 eine perspektivische Ansicht eines Teils der Druckfluid-Betätigungsanordnung der 7.

The present invention is described in detail below with reference to the accompanying figures. It shows:

• 1 a partial longitudinal sectional view of a pressurized fluid actuator assembly for a friction clutch;
• 2 FIG. 3 is a cross-sectional view of the pressurized fluid actuator assembly of FIG 1 , cut along a line II-II in 1 ;
• 3 a perspective view of a release / blocking element;
• 4th the pressurized fluid actuator assembly of FIG 1 in a pressurized fluid state;
• 5 the pressurized fluid actuator assembly of FIG 1 in a low-wear condition of a friction clutch;
• 6th the pressurized fluid actuator assembly of FIG 1 in a state of a friction clutch afflicted with greater wear to be compensated;
• 7th a longitudinal sectional view of an alternative embodiment of a pressure fluid actuation arrangement for a friction clutch;
• 8th FIG. 3 is a cross-sectional view of the pressurized fluid actuator assembly of FIG 7th , cut along a line VIII-VIII in 7th ;
• 9 FIG. 3 is a perspective view of a portion of the pressurized fluid actuator assembly of FIG 7th .

The 1 shows a partial longitudinal sectional view of a pressure fluid actuation arrangement, also generally referred to as a releaser 10 for a friction clutch 12 . The friction clutch 12 is based on an energy store provided in this and designed, for example, as a diaphragm spring 14th shown.

The pressurized fluid actuator assembly 10 comprises a first actuating element provided as a ring cylinder 16 , which with its basically ring-like structure an axis of movement A. surrounds like a ring. One essentially between an inner peripheral wall 18th and an outer peripheral wall 20th of the first actuating element 16 engaging second actuator 22nd represents the axis of motion A. ring-like surrounding annular piston ready. Via a plurality of sealing / guiding elements 24 is the second actuator 22nd with regard to the inner circumferential wall 18th and the outer peripheral wall 20th of the first actuating element 16 fluid-tight and with respect to this in the direction of the axis of movement A. movably guided.

Between the first actuating element 16 and the second actuator 22nd is one of the various sealing / guiding elements 24 fluid-tight sealed pressure fluid chamber 26th educated. A connection (not shown) can enter the pressure fluid chamber 26th a pressurized fluid, for example compressed air, are introduced in order to build up a fluid pressure in the pressurized fluid chamber 26th one the second actuating element 22nd in one operating direction B. with respect to the first actuating element 16 build up applying or moving force. When the second actuating element is moved 22nd in the direction of movement B. acts on this via a second actuating element 22nd for example held rotary decoupling bearing 28 the radially inner area, for example spring tongues which extend radially inward, of the energy storage device, for example designed as a diaphragm spring 14th in order to perform a disengagement in the direction of movement B. to move or pivot and thereby the action of the energy storage device 14th on a pressure plate of the friction clutch 12 to reduce or cancel.

The second actuator 22nd is by means of a compensation module 30th with regard to the rotary decoupling bearing 28 axially supported. The compensation module 30th comprises a first, the movement axis A. ring-like surrounding ramp element 32 and then a second, the axis of movement A. also ring-like surrounding ramp element 34 . The first ramp element 32 has a first ramp formation 36 with a plurality of ramp surfaces following one another in the circumferential direction. The second ramp element has accordingly 36 a second Ramp formation 38 with a plurality of ramp surfaces following one another in the circumferential direction. The ramp areas of the first ramp formation 36 lie on the ramp surfaces of the second ramp formation 38 on. The ones with their ramp surfaces or ramp formations 36 , 38 adjacent ramp elements 32 , 34 provide such a support characteristic of the compensation assembly 30th ready that a relative rotation of the two ramp elements 32 , 34 with respect to one another due to the ramp surfaces of the ramp formations sliding against one another 36 , 38 to a change in the axial length of the compensation assembly 30th leads.

The second actuator 22nd is through a rotation lock formation 40 with respect to the second ramp element 34 rotatably and axially movably held. The anti-rotation formation 40 includes, for example, in the second ramp element 34 one in the direction of the axis of motion A. extending groove and on the second actuating element 22nd one engaging in the groove and in the direction of the axis of movement A. elongated guide projection. In a similar way, a rotation lock which permits an axial relative movement can also be provided between the first actuating element 16 and the second actuator 22nd Act.

The first ramp element 32 is a first biasing arrangement 42 assigned. The first biasing arrangement 42 comprises a first pretensioning spring designed for example as a helical spring 44 with one of its peripheral ends on the first ramp element 32 engages and with its other peripheral end on the second actuating element 22nd attacks so that by the first biasing arrangement 42 the first ramp element 32 for rotation with respect to the second actuating element 22nd is biased.

Between the first actuating element 16 and the second actuator 22nd a second biasing arrangement acts 46 , which one the second actuating element 22nd with respect to the first actuating element 16 in the direction of actuation B. contrary to the loading effect of the energy store 14th provides prestressing force effect. The second preload spring 48 for example an axis of movement A. surrounding, in the pressure fluid chamber 26th include arranged helical compression spring.

A release / blocking assembly 50 is on the second actuator 22nd provided and basically blocks the first ramp element 32 against rotation with respect to the second actuating element 22nd . The enable / block assembly 50 includes an in 3 shown release / blocking element 52 , which on the second actuating element 22nd in the direction of the axis of movement A. is adjustable. The release / blocking element 52 several, for example two, spaced apart in the circumferential direction in respective guide recesses in the second actuating element 22nd engaging guide protrusions 56 include. Through the guide projections engaging in the guide recesses 56 it is ensured at the same time that the release / blocking element 52 with respect to the second actuating element 22nd not about one to the axis of motion A. parallel axis can be rotated.

On one of the first actuator 16 facing away from the axial side 58 of the second actuating element 22nd is a release / blocking section 60 of the release / blocking element 52 arranged. Associated with one on the enable / disable section 60 provided counter-blocking formation 62 is on the second actuator 22nd on its axial side 58 a blocking formation 64 intended. The blocking formation 64 can on the second actuating element 22nd one for example completely and the axis of movement A. all-round locking teeth 66 have which axially in the direction of the first actuating element 16 is oriented away, so in this direction from the first actuating element 16 having teeth extending away with tooth gaps formed therebetween in the circumferential direction. Corresponding to this blocking toothing 66 is at the enable / disable section 60 one the counter-blocking formation 62 providing counter-blocking toothing 68 intended. This has several successive in the circumferential direction and axially on the first actuating element 16 teeth to be extended with tooth gaps formed in between in the circumferential direction. By axial movement on the blocking toothing 66 to can the counter-blocking teeth 68 be engaged with this. The blocking teeth can be opened by opposing axial relative movement 66 and the counter-blocking teeth 68 disengaged.

On the release / blocking element 52 is a the second actuator 22nd penetrating and on one of the first actuating element 16 facing axial side of the second actuating element 22nd on the first actuating element 16 too protruding, essentially a detection area 71 providing acquisition section 72 provided which has an opening 73 penetrated in the second actuating element. To a pressure fluid leak from the pressure fluid chamber 26th to avoid acts between the detection section 72 and the second actuator 22nd a sealing element designed, for example, like an O-ring 75 . A third biasing arrangement 74 comprises a diaphragm spring-like design, the detection section 72 surrounding and with respect to this and the second actuating element 22nd themselves supporting third bias spring 76 . By this third bias spring 76 is the release / blocking element 52 with its release / block section 60 in the direction of the second actuating element 22nd too biased and is at the same time with its counter-blocking teeth 68 in the direction of the blocking teeth 66 biased to or in engagement with this. The first ramp element is in this blocking state 32 against rotation with respect to the second actuating element 22nd blocked.

The 1 represents a state of the pressurized fluid actuator assembly 10 represents in which this, for example, in connection with a new or non-wearing friction clutch 12 is used and the friction clutch 12 is in the engaged state. This means that the energy store 14th via the rotary decoupling bearing 28 and the compensation assembly 30th the second actuator 22nd into a basic position with respect to the first actuating element 16 moves or biases, in which a balance of forces between the second biasing spring 48 and the energy store 14th is set and the pressure fluid chamber 26th a slight movement of the second actuating element 22nd on the first actuating element 16 in one of the operating directions B. opposite release direction F. provides dead volume permissible beyond the basic positioning. The extent to which the second actuator 22nd in the release seal F. Can be moved even further to the first actuating element beyond the basic positioning is at least as large as the axial depth of engagement of the blocking teeth 66 with the counter-blocking toothing 68 , which can be in the range of about 3 mm.

Pressurized fluid, for example compressed air, is fed into the pressurized fluid chamber in order to carry out actuation processes 26th initiated. Due to the resulting fluid pressure, the second actuating element is applied 22nd exerted a force which this in the representation of the 3 presses to the left. Via the compensation module 30th becomes the rotary decoupling bearing 28 axially in the actuation direction B. shifted so that this is the radially inner area of the energy store 14th , so for example the radially inner ends of the spring tongues of a diaphragm spring, loaded and thus the friction clutch 12 is disengaged. To engage the friction clutch, the fluid pressure in the pressurized fluid chamber is used 26th released, so that due to the relaxing energy store 14th and also by the biasing action of the second biasing spring 48 the second actuator 22nd back in its in 1 Basic positioning shown with respect to the first actuating element 16 is shifted, in which the already mentioned dead volume, so still an axial distance between the two actuating elements 16 , 22nd , is available.

The first ramp element 32 is through the associated first biasing arrangement 42 for rotation in the circumferential direction with respect to the second actuating element 22nd biased. As the counter-blocking teeth 68 of the release / blocking element 52 in engagement with the blocking teeth 66 on the first ramp element 32 is, the first ramp element 32 do not rotate with respect to the second actuator. Furthermore, the ramp slopes of the two ramp formations 36 , 38 set in such a way that they are self-locking and that the axial forces acting when carrying out actuation processes do not lead to a forced rotation of the two ramp elements 32 , 34 can lead to each other. This self-locking effect can be reinforced by the fact that the two ramp formations 36 , 38 Contamination contained in the space area can occur, which they can also place between the adjacent ramp surfaces and thus lead to increased friction.

Steps into a friction clutch 12 Wear, this has the consequence that when the energy storage mechanism is engaged 14th can relax further than is the case in a condition with less or no wear. This means that the radially inner area of the energy store 14th in the release direction F. moved further and thus the second actuating element 22nd closer to the first actuating element beyond the basic positioning 16 too moved. This is due to the previously discussed dead volume of the pressure fluid chamber 26th with the second actuating element arranged in the home position 22nd at least possible. Such a state is in 5 shown. It can be seen that the detection section 72 of the release / blocking element 52 on the first actuating element 16 pending and therefore the release / blocking element 52 the movement of the second actuating element 22nd in the release seal F. cannot follow beyond the basic positions. The one in the friction clutch 12 However, any wear that has occurred is still so low in this state that the release / blocking element 52 although with respect to the second actuating element 22nd is shifted axially, the counter-locking toothing 68 but still in engagement with the blocking teeth 66 stands. The first ramp element is in this state 32 still against rotation with respect to the second actuating element 22nd blocked. By introducing pressurized fluid into the pressurized fluid chamber 26th disengagement processes can also be carried out in this state, in which no compensation for wear that has already occurred has taken place.

Occurs in the friction clutch 12 If further wear occurs, this leads to a state in which when the friction clutch is engaged 12 the energy store 14th relaxes so far that it is over the rotary decoupling bearing 28 and the compensation assembly 30th the second actuator 22nd moves axially further beyond the basic positioning. This state is in 6th shown. The acquisition section 72 is again on the first actuating element 16 on, and by the excessive axial movement of the second actuator 22nd in the release direction F. The counter-locking toothing is beyond the basic positioning 68 no longer in engagement with the blocking teeth 66 . The one by the first bias spring 44 The pre-tensioning force generated is now sufficient to move the first ramp element 32 with respect to the second actuating element 22nd around the axis of motion A. to twist. Due to the adjacent ramp formations that slide with respect to one another during this rotary movement 36 , 38 takes on this rotary movement of the first ramp element 32 the overall axial length of the compensation module 30th from.

Because the second ramp element 34 through the lift mechanism 14th is held in a defined axial positioning, is with this decrease in the axial length of the compensation assembly 30th the second actuator 22nd under the biasing action of the second biasing spring 48 move axially away from the first actuator. That under the axial load of the second actuator 22nd standing first ramp element 32 will twist until, along with the decrease in the axial length of the compensation assembly 30th , the blocking teeth 66 and the counter-blocking teeth 68 come back into engagement with each other. This can be the case, for example, if in the course of the rotational movement of the first ramp element 32 the teeth of the blocking teeth 66 and the counter-blocking toothing 68 have twisted a tooth in relation to each other. When the blocking teeth are in engagement again 66 and counter-locking teeth 68 an equilibrium of forces is again established between the essentially in the release direction F. acting preload force in the engaged state of the friction clutch 12 relaxed energy store 14th and that in the direction of actuation B. acting biasing force of the second biasing spring 48 . The second actuator 22nd is essentially back in its basic position with respect to the first actuating element 16 , in which then taking into account the dead volume of the pressure fluid chamber that is then present for the compensated state 26th again actuation processes can be carried out and then when in the friction clutch 12 such wear has occurred again that in the engaged state of the friction clutch 12 the second actuator 22nd in the in 6th reaches the state shown, a wear compensation process is carried out again in the manner described above.

Used in the friction clutch 12 If, for example, a completely worn clutch disc is replaced or a new friction clutch is installed in a vehicle, it is necessary to also use the pressurized fluid actuation arrangement 10 to bring back into a state associated with a new state of a friction clutch. To do this, after the blocking effect of the release / blocking assembly has been released 50 the first ramp element 32 against the biasing action of the first biasing spring 44 be turned back again to thereby reduce the axial length of the compensation module 30th to increase again and to create the possibility for the subsequent operation of the friction clutch that a rotation of the first ramp element again to an extent corresponding to the wear 32 and an associated decrease in the overall axial length of the compensation assembly 30th can occur.

To in case of failure of the compensation module 30th , for example in the event of a complete collapse of the ramp elements axially supported on one another 32 , 34 to ensure that the pressurized fluid actuator assembly 10 Can be operated in an emergency mode and friction clutch 12 can still be operated, is the second operating element 22nd on the inner circumferential wall 18th and the outer peripheral wall 20th of the first actuating element 16 maximally displaceable to such an extent that also in this case a complete disengagement of the friction clutch 16 is guaranteed.

With reference to the 7-9 is an alternative embodiment of a pressurized fluid actuation arrangement 10 described. This corresponds in essential aspects, in particular also the transmission of an actuating force via the two by means of respective ramp formations 36 , 38 adjacent ramp elements 32 , 34 , the structure described above, so that reference can be made to the preceding statements in this regard.

A fundamental constructive difference is that the release / blocking assembly 50 is structurally decoupled from the second actuating element 22nd . The enable / block assembly 50 includes a ring-like release / blocking element body 78 trained release / blocking element 52 . The release / blocking element body 78 surrounds the axis of motion A. ring-like and is essentially also radially outside the both ramp elements 32 , 34 or the ramp formations 36 , 38 the same or radially within the outer peripheral wall 20th of the first actuating element 16 . The detection area 71 is on the release / blocking element body 78 provided integrally and by a radially outwardly protruding, collar-like detection section 72 provided, which is an axial end of the outer peripheral wall 20th of the first actuating element 16 preferably over the entire circumference around the axis of movement A. overlaps radially. By, for example, designed as a helical compression spring and the movement axis A. surrounding third bias spring 76 the third biasing arrangement 74 is the release / blocking element body 78 in the release direction F. towards the first ramp element 32 , the second actuator 22nd or also the first actuating element 16 too biased. The third preload spring provides support 76 for example on the second ramp element 34 from. By this biasing action, the detection portion is 72 basically in contact with the outer circumferential wall 20th of the first actuating element 16 biased.

On a radially inwardly reaching area of the release / blocking element body 78 is a release / blocking area in a peripheral area 80 intended. This is formed separately in the example shown and includes a release / blocking part 82 , which by riveting on the release / blocking element body 78 is fixed. At this release / blocking part 82 is the counter-blocking formation 62 with their counter-blocking teeth 68 educated.

At least in the one with the release / blocking area 80 cooperating peripheral region of the first ramp element 32 is the blocking formation 64 with their blocking teeth 66 intended. The blocking teeth are also in this embodiment 66 into the counter-blocking toothing 68 formed with teeth protruding in the axial direction, so that they are caused by relative axial movement between the first ramp element 32 and the release / blocking element 52 can be brought into and out of engagement.

In the in 7th The state shown is, for example, when the friction clutch is not subject to wear and tear 12 the second actuator 22nd in its basic position with respect to the first actuating element 16 . The second biasing spring, designed for example as a corrugated spring or the like, in this embodiment 48 the second biasing arrangement 46 holds the second actuator 22nd at a distance from the first actuating element 16 , so that basically a movement of the second actuating element 22nd in the release direction F. on the first actuating element 16 is possible beyond the basic positioning. By the biasing action of the second biasing arrangement 46 on the one hand and the third biasing arrangement 74 on the other hand is the blocking teeth 66 in engagement with the counter-blocking toothing 68 held so that this is under the bias of the first biasing arrangement 42 standing first ramp element 32 cannot rotate and thus a defined axial relative positioning of the first actuating element 22nd with regard to the rotary decoupling bearing 28 is specified and a correspondingly defined actuation of the friction clutch 12 by introducing pressurized fluid into the pressurized fluid chamber 26th can be done.

Occurs in the friction clutch 12 Wear, this has the consequence that when the energy storage mechanism is engaged 14th can relax further and thus its radially inner area is in the release direction F. further on the first actuating element 16 too moved. Through the force of the energy store 14th move the second actuator 23 and by the third biasing arrangement 74 on this to the pre-tensioned release / blocking element 52 in the release direction F. until the detection section is reached when the home position is reached 72 in contact with the outer circumference wall 20th comes. Since the energy accumulator 14 is further relaxed in this state, the second actuating element is 22nd in the release direction F. against the biasing action of the second biasing arrangement 46 beyond the basic positioning further to the first actuating element 16 to postponed. This movement can be the release / blocking element 52 do not follow. Due to the relative movement that occurs between the release / blocking element 52 and the second actuator 22nd or the first ramp element axially supported thereon 32 come the blocking teeth 66 and the counter-blocking teeth 68 out of engagement, with the result that now the first ramp element 32 for rotation around the axis of motion A. is released and under the biasing action of the first biasing arrangement 42 with respect to the second ramp element 34 will turn. This increases the axial length of these two ramp elements 32 , 34 comprehensive compensation assembly 30th from. That by the second biasing arrangement 46 in the direction of actuation B. acted upon second actuating element 22nd follows this decrease in axial length and shifts in the actuation view B. from the first actuator 16 away towards its home position. The blocking teeth come here 66 and the counter-blocking teeth 68 again in engagement with each other, so that after compensating for wear, the two ramp elements 32 , 34 by the release / blocking assembly 50 are secured against relative rotation again and then with a shortened axial length of the compensation assembly 30th actuation processes can be carried out again.

The dead volume of the pressure fluid chamber to be kept available in the pressure fluid actuation arrangement constructed according to the invention for carrying out compensation processes is comparatively small and essentially does not impair the precision of the control of the friction clutch. In particular, this dead volume remains essentially constant over the operating life of a friction clutch, so that constant actuation characteristics can also be ensured over the operating life.

List of reference symbols

10

Pressurized fluid actuator assembly

12th

Friction clutch

14th

Energy storage

16

first actuator

18th

Inner peripheral wall

20th

Outer peripheral wall

22nd

second actuator

24

Sealing / guiding element

26th

Pressurized fluid chamber

28

Rotary decoupling bearings

30th

Compensation assembly

32

first ramp element

34

second ramp element

36

first ramp formation

38

second ramp formation

40

Anti-rotation formation

42

first biasing arrangement

44

first preload spring

46

second biasing arrangement

48

second preload spring

50

Enable / block assembly

52

Release / blocking element

56

Leadership advantage

58

axial side

60

Release / block section

62

Counter-blocking formation

64

Blocking formation

66

Blocking teeth

68

Counter-locking teeth

70

axial side

71

Detection area

72

Acquisition section

73

opening

74

third biasing arrangement

75

Sealing element

76

third preload spring

78

Release / blocking element body

80

Release / blocking area

82

Release / blocking part

A.

Axis of motion

B.

Operating direction

F.

Release direction

Claims (14)

Pressure fluid actuation arrangement for a friction clutch, comprising - a first actuation element (16) and a second actuation element (22) delimiting a pressure fluid chamber (26) with the first actuation element (16), the second actuation element being introduced by introducing pressure fluid into the pressure fluid chamber (26) (22) is movable with respect to the first actuating element (16) in an actuating direction (B) along a movement axis (A), - one with the second actuating element (22) via a compensation assembly (30) for joint movement in the direction of the movement axis (A) Coupled rotary decoupling bearing (28), the compensation assembly (30) comprising: - one axially supported with respect to the second actuating element (22) in the direction of the movement axis (A) by a first pretensioning arrangement (42) for rotation about the movement axis (A) with respect to the second actuating element (22) biased first ramp element (32) with a first ramp formation (36), - e in a second ramp element (34) movable together with the rotary decoupling bearing (28) in the direction of the movement axis (A), the second ramp element (34) having a second ramp formation (38) and with the second ramp formation (38) on the first ramp formation (36) ) is supported in the direction of the movement axis (A), the second ramp element (34) being non-rotatable with respect to the second actuating element (22) about the movement axis (A), and wherein the first ramp element is rotated when the first preload arrangement (42) rotates (32) with respect to the second ramp element (34) around the axis of movement (A) an axial length of the compensation assembly (30) decreases, - a release / blocking assembly (50) adjustable between a blocking position and a release position with a blocking engagement in the blocking position with a blocking formation (64) on first actuating element (16) standing counter-blocking formation (62), the release / blocking assembly (50) having a function for adjusting the release / blocking assembly (50) from the blocking position to the release position in interaction with the first actuation element (16) stepping detection area (71). Pressurized fluid actuator assembly according to Claim 1 , characterized in that the first actuating element (16) is a cylinder, preferably an annular cylinder, and that the second actuating element (22) is a piston, preferably an annular piston. Pressurized fluid actuator assembly according to Claim 1 or 2 , characterized in that the first ramp element (32) is ring-like and has at least one, preferably a plurality of first ramp formations (36) extending in the circumferential direction, and that the second ramp element (34) is ring-like and at least one, preferably a plurality of second ramp formations (38) extending in the circumferential direction. Pressurized fluid actuation arrangement according to one of the preceding claims, characterized in that the first preload arrangement (42) comprises a first preload spring (44) extending in the circumferential direction around the axis of movement (A), the first preload spring (44) with one of its end regions with respect to the second actuating element (22) is supported and is supported with the other of its end regions with respect to the first ramp element (32). Pressurized fluid actuating arrangement according to one of the preceding claims, characterized in that the second ramp element (34) is coupled to the second actuating element (22) in a rotationally fixed manner and is movably coupled with respect to it in the direction of the movement axis (A). Pressurized fluid actuation arrangement according to one of the preceding claims, characterized in that the second actuation element (22) is prestressed by a second prestressing arrangement (46) with respect to the first actuation element (16) in the direction of the movement axis (A) in the actuation direction (B). Pressurized fluid actuation arrangement according to one of the preceding claims, characterized in that the release / blocking assembly (50) has a release / blocking assembly which is displaceable on the second actuation element (22) between the blocking position and the release position essentially in the direction of the movement axis (A). Element (52), wherein the release / blocking element (52) is assigned a third biasing arrangement (74) for biasing the release / blocking element (52) with respect to the second actuating element (22) in its blocking position. Pressurized fluid actuator assembly according to Claim 7 , characterized in that the releasing / blocking element (52) has a releasing / blocking element (22) which is arranged on an axial side (58) of the second actuating element (22) facing away from the first actuating element (16) and which has the counter-blocking formation (62) Section (60) and a second actuation element (22) penetrating through and on an axial side (70) of the second actuation element (22) facing the first actuation element (16) for the detection interaction with the first actuation element (16) protruding detection section (72) of the detection area (71). Pressurized fluid actuator assembly according to Claim 8 , characterized in that the third biasing arrangement (74) comprises a biasing spring (76) which is supported with respect to the detection section (72) and the second actuating element (22) and the detection section (72) is to be biased towards the first actuating element (16). Pressurized fluid actuation arrangement according to one of the Claims 1 - 6th , characterized in that the release / blocking assembly (50) has a release / blocking element (52) arranged on an axial side (58) of the second actuation element (22) facing away from the first actuation element (16) with a ring-like release / Blocking element body (78), the releasing / blocking element (52) being assigned a third biasing arrangement (74) for biasing the releasing / blocking element body (80) in a release direction (F) opposite to the actuating direction (B) onto the second Actuating element (22) closed. Pressurized fluid actuator assembly according to Claim 10 , characterized in that a release / blocking area (80) having the counter-blocking formation (62) and the detection area (71) interacting with the first actuating element (16) are provided on the release / blocking element body (78) . Pressurized fluid actuator assembly according to Claim 10 that the release / blocking area (80) comprises a release / blocking part (82) attached to the release / blocking element body (78) and having the counter-blocking formation (62), and that the detection area (71) comprises a from the ring-like release / blocking element body (78) for sensing interaction with the first Actuating element (16) comprises radially outwardly protruding detection portion (72). Pressure fluid actuation arrangement according to the preceding claims, characterized in that the blocking formation (64) on the first ramp element (32) has a blocking toothing (66) which at least partially surrounds the movement axis (A) in a ring-like manner and is axially oriented away from the first actuation element (16). comprises, and that the counter-blocking formation (62) on the release / blocking assembly (50) is axially oriented in the direction of the first actuating element (16) and by axial displacement of the release / blocking assembly (50) with respect to the second The actuating element (22) comprises counter-locking toothing (68) which can be brought into and out of locking engagement with the locking toothing (66). A clutch system comprising a friction clutch (12) with an energy store (14) which can be acted upon by a pressure fluid actuation arrangement (10) according to one of the preceding claims for carrying out clutch actuation processes.

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