DE202009010239U1 - Clutch Actuator - Google Patents

Abstract

Clutch actuation device for opening and closing a clutch, which comprises a hydraulic device with a transmitter unit (1) and a slave unit (2), between which a hydraulic section (3) is located, wherein the transmitter unit (2) can be pressurized by means of a clutch activator (8) is on the hydraulic unit on the slave unit (2) is transferable, and in the hydraulic line (3) at least one aperture (4) for reducing the pressure transmission to the slave unit (2) is arranged, characterized in that between the clutch activator (8 ) and the diaphragm (4) at least one energy storage element (7; 14) is arranged, in which at least a part of the pressure energy generated by the clutch activator (8) can be stored.

Description

TECHNICAL AREA

The The present invention relates to a clutch actuating device for opening and closing a clutch, in particular for engaging and disengaging a motor vehicle clutch, according to the preamble of claim 1.

STATE OF THE ART

For switching clutches, which are in the ground state in engagement for a frictional connection, so are biased in a closed state, as used for manual transmissions of motor vehicles for example, hydraulic switching systems are known. The switching systems transmitted by an operating pedal, the Entkupplungskraft to the elsewhere arranged clutch, in particular from the passenger compartment to the seated in the drive train clutch. In this case, a clutch encoder is acted upon, for example by pressing a pedal and transmitted the pressure force via a hydraulic link to the clutch slave, which causes an opening of the clutch. If the operation of the pedal is omitted, a reverse power flow occurs due to the coupling bias and the clutch is closed again. To reduce the operating speed of the clutch, or to delay the transmission of power from the clutch slave to the clutch encoder, it is known in the hydraulic circuit z. B. to provide a throttle which limits the flow and thus affects the closing of the clutch. An exemplary representation is the DE 10 2008 058 674 A1 (Priority date: 03.12.2007, Applicant: Luk) to be found, which proposes to arrange the throttle referred to as "peak torque limiter" in a hydraulic valve between master cylinder and slave cylinder, in particular as a through hole in a flange of the slave cylinder. Further, it is known to bypass a throttle by a bypass with a check valve.

In such clutches, the phenomenon of "Auskuppelschlags" can come with a quick opening of the clutch. This phenomenon occurs z. B. on when the opening of the clutch takes place at a time to which a drive train of the motor vehicle is strongly braced due to a torque just applied. Typical situations for this are z. B. aborted startup operations, in which a just started starting process z. B. is abruptly terminated by the driver due to an unexpected traffic situation. An abruptly occurring operation of the clutch relaxes the tensioned to start drive train. The released energy essentially leads to a vibration of the transmission shafts or the associated inertia with a so-called drive train natural frequency. This decay is usually associated with clearly audible unwanted envelope noise, which are also known as Auskuppelschlag. In addition to the above-mentioned noise, the oscillations described also lead to fluctuating and thus poorly predictable relative rotational speeds in the rapid disengagement of preloaded drive trains on the shifting elements, the components of the synchronizers. Especially in the commercial vehicle sector can be found due to these fluctuations, the so-called. Schwingungskratzen in the switching process. Measures to limit the twist somehow, z. B. the DE 3 628 774 A1 (Priority date: 07.09.1985, applicant: LuK) or the JP62270834 (Filing date: 19.05.1986, applicant: NISSAN MOTOR).

The the above publications apply with respect to possible publications Hydraulic circuits between master cylinder and slave cylinder their references than in the scope of disclosure of the present Description incorporated.

Further can with fast switching operations with a jerky Actuation of the clutch pedal a hardening or Blocking the pedal, actually the force of pedal on the master cylinder, enter, as the clutch encoder applied Force z. B. due to the throttle not at the same speed can deliver to the clutch slave. For the driver results this results in an unpleasant, irregular behavior the clutch pedal in the implementation of a switching operation.

PROBLEM

It would be good, the above-mentioned disadvantages when pressing To avoid a clutch, but at least reduce their influence to be able to. This should envelope noise as possible be well reduced. A uniform behavior When operating a clutch should be possible be respected. Furthermore, it would be good if the power transmission from clutch slave to clutch master adjustable or controllable is. In the automotive industry, there is a maxim that namely Any proposed solution is a simple, reliable and cost-effective design of the corresponding module should bring with it. Between the numerous requirements is to form an advantageous balance.

PRESENTATION OF THE INVENTION

The object of the invention is achieved by the invention by a Kupplungsbetätigungsvorrich achieved according to claim 1. Advantageous embodiments and embodiments are described in the dependent claims.

To The present invention is a clutch actuating device for opening and closing, or for engaging and disengaging, a clutch provided, which is a hydraulic device with a Encoder unit and a Nehmereinheit has, on the clutch acts. Located between the transmitter unit and the receiver unit a hydraulic circuit. The transmitter unit is by means of a clutch activator pressurized by the hydraulic section is transferable to the receiving unit. In the hydraulic section At least one aperture is arranged, which serves as a reduction element for Reduction of pressure transmission to the slave unit is used. According to the invention is between the coupling activator and the diaphragm arranged an energy storage element, in which at least a portion of the pressure energy generated by the clutch activator storable is and preferably from the stored part of the pressure energy is deliverable in the hydraulic system.

The Clutch actuator is for use suitable for manual transmissions of motor vehicles, can but also used in other hydraulically shiftable couplings become. The present invention is particularly advantageous use in long drive trains in a motor vehicle, especially in rear-wheel drive trains in sedans; the invention shows its advantages in rear longitudinal drive trains, where due to the length of the driveline, the drivetrain behavior may be called soft. In one embodiment, works the clutch operating device advantageous in motor vehicles Rear longitudinal knob strands.

To The present invention is used to open a clutch the clutch activator operates on the hydraulic unit acts. The clutch activator is usually a pedal. But it can Also, a hand-operated handle or lever can be used. Upon actuation of the clutch activator is thus pressure transferred to the encoder unit, which in turn gives a pressure generated in the hydraulic circuit. The hydraulic line is from the Aperture in a primary line between transmitter unit and Aperture and in a secondary line between aperture and receiver unit divided. The aperture preferably has a variably adjustable Flow area on. The cross section may, for example, depending on different driving situations, or clutch situations, increased or be reduced so that the voltage applied in the primary line pressure more or less or not at all delayed can be. Basically, others can Components are used to reduce the pressure, such. Legs simple throttle. When pressurizing the hydraulic section through the transmitter unit is thus generated in the primary line Primary pressure through the shutter is delayed to one Transfer secondary pressure in the secondary line, especially in terms of the dynamic pressure curve in reducing or temporally limiting manner. The secondary pressure can thus adapted to the requirements of the couplings to be switched. Thus, the actuation process of the clutch activator at least largely from the pressure ratios in primary and secondary line is independent, according to the invention between the clutch activator and the reduction element an energy storage element provided that the pressure energy generated by the clutch activator can cache completely or partially. Will therefore more or less strong, or fast actuation of the clutch activator produces a more or less high pressure, the resulting Pressure energy completely or above a certain minimum pressure directed into the energy storage element. Once the primary pressure in the primary line to a predetermined level has decreased, the energy storage element gives the stored Pressure energy back to the hydraulic device and the slave unit will continue to be pressurized.

advantageous further aspects and details of the present invention discussed below.

The Clutch actuating device with an energy storage element according to the present invention allows a temporal Delay of the pressure output by the clutch activator on the receiving unit of the hydraulic unit. This z. B. at fast or vigorous actuation of the clutch activator hardening or even blocking of the coupling activator avoided, because initially excess Energy can be delivered to the energy storage element. moreover unpleasant switching noise is prevented. It will thus allows a smooth engagement and disengagement of the clutch, even if the clutch activator is pressed quickly. For the driver, this results in a pleasant regular Behavior of the clutch activator when it is actuated. The result is a uniform clutch pedal travel, without that elaborate controls in hydraulics, such as actively operated pumps are necessary.

According to the invention, the energy storage element z. B. by one or more springs, such as coil springs are formed. The use of gas springs is conceivable. Several springs can be connected in parallel or in series. It can also feathers with un be used different spring strength. It can be used a spring with a certain spring coefficient. Based on the spring coefficient, the storage behavior can be adjusted. Depending on the design of the clutch actuating device, the springs can be tensioned by a tensile force or by a compressive force. The energy storage element may also have a hydraulic unit. The hydraulic unit may comprise a piston or a membrane, which are moved to receive the energy. The piston or the membrane may, for. B. be biased by a spring. By selecting the biasing force of the energy storage element, the minimum pressure can be defined upon actuation of the clutch activator, is introduced from the pressure energy into the energy storage element. The biasing force may, for. B. be defined by the number of springs or by the choice of spring stiffness. Depending on the type of clutch activator, the hydraulic unit or the clutch to be switched a suitable number of springs or spring stiffness is selected. For clutches in passenger cars, which are switched via a clutch pedal, for example, a spring with a spring stiffness between 5 and 30 N / mm can be selected, preferably between 9 and 18 N / mm. Preferably, the softest possible spring in conjunction with a bias in the range of maximum clutch actuation force to generate the pressure is desirable.

at a first variant of a clutch actuator According to the present invention, the energy storage element between the clutch activator and the hydraulic device, or be provided the encoder unit. For example, the coupling activator be designed as a pedal and act on a spring, in turn acts on the encoder unit. When operated, d. H. at the Pressing the pedal, the pressure force acts on the energy storage element in the form of the spring and compresses it, reducing the pressure energy at least for the most part is stored by the spring. The spring gives the pressure energy delayed to the encoder unit from, whereby this is pressurized. It acts on the Encoder unit a force corresponding to the spring strength. From the transmitter unit becomes the pressure via the reduction element forwarded to the receiver unit and actuates the clutch.

In the initial situation in which the clutch is closed is preferably biasing the spring with a biasing force. The Preload of the pedal spring is chosen so that from a certain pedal actuation force the spring on is tense, d. H. Energy is stored, and another elevation the pedal operation force is prevented. This will hardening of the pedal avoided. The in the pedal spring stored energy now dissipates the energy delayed the Pedalbetätigungskraft to the encoder unit on. The Bias of the spring is also preferably chosen that eventually the entire bias that during the actuation was introduced into the spring, discharged again becomes. The spring is thus chosen sufficiently rigid or biased, to complete the operation of the clutch to ensure pedaling.

In an embodiment of such a clutch actuating device For example, at least one spring provided as an energy storage element can be used approximately parallel to a longitudinal direction of the Pedals arranged to approximate a spring force of the spring acts parallel to this longitudinal direction. The pedal is common an elongated, pivoting lever. The longitudinal direction extends in its longest extent. This will be a compact design of the clutch actuating device according to the invention achieved.

at a second variant of an inventive Clutch actuating device may be the energy storage element be provided between the encoder unit and the aperture. Therefor can be connected to the primary line a hydraulic unit be, which is preferably biased by a spring, so a piston of the hydraulic unit work against the force of the spring got to. Once the clutch activator z. B. in the form of a pedal the encoder unit of the hydraulic device acts, creates a pressure in the primary line. The resulting from the aperture Flow resistance preserves the higher pressure during pedal operation in the primary line. Especially with a fast pedal movement increases the primary side Pressure accordingly strong. From a predetermined minimum pressure value the hydraulic medium enters the hydraulic unit of the energy storage element and the pressure in the primary line can not exceed this pressure value. The minimum pressure value thus simultaneously forms the maximum pressure value in the primary line. The pressure energy is u. a. in the Spring of the energy storage element stored, attached to the piston the hydraulic unit connects. This will cause an overshoot avoided the primary-side pressure. This limitation the primary-side maximum pressure allows the force felt by the driver on the pedal as well to limit. It thus occurs despite reduced by means of the aperture Pressing force in the secondary line, or a slowed clutch opening speed, no hardening of the pedal. The maximum back pressure, the driver feels or occurs in the pedal is limited.

The hydraulic medium which has entered the energy storage element is fed back to the hydraulic circuit due to the energy present in the storage spring in the form of force. Thus, at some point after the Pedalbe actuation of the situation that the energy storage element is in turn emptied and the displaced in the encoder unit hydraulic volume has been fully used to operate the slave unit. Preferably, for this purpose, the bias of the spring is selected so that the pressure generated in the hydraulic unit of the energy storage element is greater than the pressure required for the clutch operation on the slave unit. Thus, from the application of a predetermined minimum primary pressure in the primary line, the energy storage element can absorb pressure energy and feed pressure energy into the primary line below this minimum primary pressure.

To It is also possible with the invention in a clutch actuating device a combination of the two variants of a previously described To use energy storage element. So it's possible an energy storage element both between the clutch activator and the encoder unit as well as between the transmitter unit and the aperture use.

As previously mentioned, the aperture is as a reducing agent for Reduction of the primary pressure provided. By suitable Selecting the passage cross-section of the aperture will slow opening achieved the connected coupling. This is especially slower Ride or uphill, especially in low gear advantageous. In situations of a strong torsion in the drivetrain promotes the Delay caused by the aperture a gentler Disengage. The aperture cross-section can be set variably, preferably a cross section between 0.5 and 1.2 mm, especially preferably between 0.8 and 1.0 mm, is selected. tries have z. B. shown that at a diaphragm cross-section of 0.8 mm, or 1.0 mm, the delay time between reaching the end stop of the pedal and the reaching of the end position when opening The clutch is about 0.33 seconds, or 0.18 seconds. With the smaller cross section, therefore, the delay time extended by about 0.15 seconds.

In This cross-sectional area of the diaphragm is the function of the clutch actuator in a temperature range between -20 ° C and + 55 ° C guaranteed. The delay times of the clutch actuator according to the invention increase at low temperatures versus those at room temperature. Another influence on the delay times can by choosing whether throttle or aperture in the design phase of the hydraulic actuation section to get voted.

at a preferred embodiment of a clutch actuator According to the invention is in the hydraulic circuit of the hydraulic device a bypass provided with a check valve. The bypass serves to bypass the aperture. The check valve is arranged so that when opening the clutch by Pressurization on the encoder unit, d. H. in the primary line, closed is and thus the pressure generated in the secondary line can be reduced through the aperture. While closing the clutch, d. H. while relieving the coupling activator, wherein the slave unit, which functions as a donor in the case, through the Preload the clutch is pressurized, the check valve opened and the pressure in the hydraulic medium can over the Bypass back to encoder unit balance without the bezel to go through.

Further can in an advantageous embodiment of a clutch actuator according to the invention between the encoder unit and the receiver unit the hydraulic device an electrically switchable switching unit, z. B. be provided in the form of a switching valve. The switching unit is at least between a blocking position and a passage position switchable. The passage position can be considered complete open position of the valve or as throttle with reduced cross-section or as a diaphragm, in particular as a diaphragm with variable cross section, be realized. The switching unit is preferably connected in parallel with the diaphragm, for example by means of a bypass around the aperture. Particularly preferred are in the Hydraulic line the orifice, the check valve and the Switching connected to each other in parallel. In a special advantageous embodiment, the components diaphragm, check valve and switching unit an assembly, in particular a one-piece Assembly, dar.

to Control of the switching unit can be provided a control unit be. The control unit can change the position of the switching z. B. depending on a present driving situation, or depending on the operating condition of one with the clutch control working drivetrain. Is z. B. a high slip in the drive train, a quick disengagement is required. For this purpose, the switching device in passage position brought about a rapid force in the receiving unit to achieve. When driving slowly, in uphill or at low Gears, however, the switching device is in the blocking position brought, so that a volume flow of the hydraulic medium to open the coupling is only possible through the aperture, so that the Receiver unit acted only slowly and thus the clutch slowed down.

It is an advantage of the clutch actuating device according to the present invention, that he by the operation of the clutch activator witnessed hydraulic pressure can be transmitted directly to the slave unit, d h. directly by the pressure force from the actuation of the clutch activator or delayed by the pressure force from the energy storage element. An additional activation of the hydraulic medium, z. B. by means of a pump is not required. The energy storage element thus serves as a passive delay means for delaying the pressurization of the receiving unit. The entire hydraulic circuit can be described as a passive hydraulic circuit. The hydraulic circuit is pumpless. The hydraulic circuit is characterized by its simplicity. The hydraulic circuit has an energy source, the master cylinder. The hydraulic circuit communicates with an energy store. The hydraulic circuit has an energy sink, the slave cylinder. The hydraulic circuit has in the working direction, which is the pressure unfolding direction for disengaging the clutch, a delay element. There are no further pressure-influencing elements between the elements of the hydraulic circuit.

The The present invention can also be understood in terms of energies and forces be characterized. It is a clutch actuation path, which is particularly hydraulic to implement. The power, the is preferably initiated by a person to operate a connected clutch is split or cached. The Energy derived from the energy is stored in an energy store. The energy storage takes part of the operating force initiated energy; another part of the energy introduced is used as actuating force for a slave cylinder used. The energy store releases its stored energy. The energy storage supplies for a subsequent Phase energy for the slave cylinder. At the slave cylinder is the coupling, in particular a multi-plate clutch, connected.

In The previously described embodiments became predominant reported on the use of an aperture. In place of the aperture can also use a throttle. The aperture draws characterized by the fact that they have a lower dependence from the temperature of the hydraulic medium. When using a Throttle increases the influence of the hydraulic fluid temperature.

BRIEF DESCRIPTION OF THE DRAWINGS

preferred Embodiments of the invention will be described below of the drawings, for explanation only serve and are not to be construed restrictively. From the drawings Apparent features of the invention are intended to be individual and in every respect Combination as belonging to the disclosure of the invention to be viewed as. In the drawings show:

1 a schematic representation of a first embodiment of a clutch actuating device with an energy storage element between a clutch activator and a hydraulic device and

2 a schematic representation of a second embodiment of a clutch actuating device with an energy storage element between a transmitter unit of the hydraulic device and a diaphragm in the hydraulic circuit.

In the figures are named the same components with the same reference numerals. Furthermore, only those for the representation of the invention mentioned essential components. Further components of a clutch switching system, however, the understanding of the invention is a subordinate one May have meaning in the clutch actuation devices shown be included, even if they are not shown graphically.

In 1 a first embodiment of a clutch actuator according to the invention is shown. The clutch actuating device comprises a hydraulic device with a transmitter unit 1 as a clutch transmitter, a slave unit 2 as a clutch slave and an intermediate hydraulic section 3 , The coupling transmitter 1 and the clutch taker 2 each have a reservoir 1' and 2 ' for a hydraulic medium and in each case a piston 1'' and 2 '' on. In the hydraulic section 3 is a blind 4 provided, whose cross section is adjustable. The aperture 4 divides the hydraulic section 3 in a primary line L1 between the clutch encoder 1 and the aperture 4 and a secondary line L2 between the shutter 4 and the clutch slave 2 , The hydraulic route 3 has a bypass 5 around the aperture 4 around. In the bypass 5 is a check valve 6 arranged.

To the clutch master piston 1'' closes an energy storage element in the form of a spring 7 at. The feather 7 can by means of a clutch activator in the form of a pedal 8th by pressing the pedal 8th be charged with force.

In the schematic representation of 1 is the axis of the spring 7 at an angle to the longitudinal direction of the pedal 8th shown. In fact, however, the spring can advantageously be parallel to the longitudinal direction, ie along the pedal 8th to be ordered. Thus, the spring can save space along the pedal, preferably within z. As a strut of the pedal to be installed. In this case, the arrangement may be provided such that the spring by actuation of the pedal 8th is put under train. This can, for example, with the help of one or more deflection Pieces or elbows are made. In any case, the spring 7 installed so that they have a compressive force on the piston 1'' of the coupling sensor 1 can create.

To the piston 2 '' of the clutch taker 2 joins the clutch to be operated in 1 not shown.

When disengaging, the pedal becomes 8th pressed, so first the spring 7 is tensioned and thereby stores the pressure energy generated by the pedal. Once the resilience of the spring 7 sufficient for the piston 1'' of the coupling sensor 1 to drive, this is within the clutch encoder 1 advanced and acts on the reservoir 1' , so that the hydraulic fluid in the primary line L1 with (additional) pressure is applied. The energy when pressing the pedal 8th arises, is (at least partially) in the spring 7 cached and delivered only delayed to the hydraulic device. The cross section of the panel 4 can be adjusted depending on a present driving situation, as previously described. For example, the cross section is reduced at low speeds, so that the pressure applied in the primary line L1 compressive force is only reduced to the secondary line L2 passed and thus the opening of the clutch is slowed down. If a quick shift is required, a larger cross section is selected, so that the primary pressure is only slightly or not at all reduced and the clutch opens quickly.

For this purpose, a vehicle control unit (not shown) may be provided which controls the aperture effect of the panel 4 adjusted or influenced, in particular depending on the driving situation.

On the operation of the pedal 8th has the choice of the cross section of the aperture 4 hardly influence, because the applied energy first in the spring 7 is cached as an energy storage element. The resistance to the elasticity of the spring 7 when pressing the pedal is at large or small cross-section of the aperture 4 at least approximately equal, so that the driver experiences a smooth, harmonious clutch actuation both large and small clutch pedal. With a small aperture cross-section, the emptying of the energy storage element, ie the relaxation of the spring, lasts 7 , but longer than a large aperture cross section.

In 2 a second embodiment of a clutch actuator according to the present invention is shown. The clutch actuating device also has a hydraulic device with a transmitter unit 1 as a clutch transmitter, a slave unit 2 as a clutch slave and a hydraulic line 3 with a panel 4 on that from a first bypass 5 with a check valve 6 is bypassed. There is also a second bypass 9 provided, which is parallel to the first bypass 5 and to the aperture 4 is arranged. In the second bypass 9 is a switching unit 10 provided between a blocking position 11 and a passage position 12 can be switched. The switching of the switching unit 10 is z. B. by means of an electromagnet 13 performed, the z. B. by a control unit (not shown) is controlled. The control unit, which often uses a vehicle control unit, can also be used to control the setting of the aperture cross-section. But you can also use a different control for the aperture.

In the embodiment of the 2 the pedal acts 8th directly on the piston 1'' of the coupling sensor 1 so that upon actuation of the pedal in the primary line L1 a primary pressure is generated. To the primary line L1 is an energy storage element 14 connected according to the present invention. The energy storage element 14 includes a hydraulic unit 15 , which serves as a hydraulic storage unit, with a reservoir 15 ' and a piston 15 '' as well as a spring 16 , which at one end to the piston 15 '' attacks and is firmly occupied at the other end. The feather 16 can act as energy storage. Depending on the installation variant, the spring can be tensioned by tension or pressure.

When opening the clutch, depending on the driving situation, such as starting situation, slow driving, uphill, acceleration or even high-speed drive, from the control unit, the appropriate position of the switching unit 10 chosen and adjusted. In addition, a matching aperture cross section for the aperture 4 chosen if a reduction of the primary pressure in the primary line L1 is required.

During slow driving, for example, the switching unit 10 in the locked position 11 brought. If pressure is built up in the primary line L1 which is passed on to the secondary line L2, the check valve is in this direction 6 in the first bypass 5 closed. That from the clutch transmitter 1 displaced hydraulic medium must therefore be completely through the aperture 4 be routed to the secondary line L2. At the aperture 4 a small cross section was set so that it acts as a reduction element. At the clutch slave 2 Therefore, pressure is built up slowly and the clutch is only opened slowly.

If the clutch is to be opened quickly, such as during continuous fast travel, the switching unit 10 the passage position 12 take and it can be a big cross section at the aperture 4 be set. The hydraulic medium can then both through the aperture 4 with little or no reduction effect and by the switching unit 10 get into the secondary line L2, so that the clutch slave 2 quickly applied and the clutch is opened quickly.

When depressing the pedal 8th a pressure is generated in the primary line L1. The pressure increases as the pedal depresses 8th at. From a predetermined minimum pressure, the pressure force is sufficient to energy in the energy storage element 14 bring in, ie the pressure force can against the piston 15 '' the hydraulic unit 15 , which is preferably a hydraulic storage tank or a hydraulic storage unit, press and the spring 16 tighten. Depending on the choice of spring stiffness, the required minimum pressure can be set. Once the pressure in the primary line L1 has fallen below the minimum pressure after z. B. the pedal is completely depressed, gives the energy storage element 14 the stored energy back into the primary line L1 by the spring 16 relaxed. The energy is supplied to the primary line L1 so delayed. The energy storage element 14 is by relaxing the spring 16 (Almost, except for constructively remaining minimum quantities,) completely emptied, so that the entire available energy partly directly, partly delayed to the clutch taker 2 is passed on.

With the help of the energy storage element according to the invention 14 can therefore the pedal 8th be pressed as strong as desired, regardless of the settings in the hydraulic unit, ie the aperture 4 and the switching unit 10 The clutch pedal travel remains the same for the driver. The energy excessively generated in the primary line L1 becomes the energy storage element 14 diverted and stored there until it can be returned to the hydraulic line.

When closing the clutch, the hydraulic fluid from the clutch slave 2 back to the clutch master 1 directed. In this direction is the check valve 6 in the first bypass 5 opened and the switching unit 10 can in the passage position 12 be brought so that the hydraulic medium can flow back quickly and is available for the next clutch operation.

The embodiments of a clutch actuator according to the 1 and 2 can basically be combined with each other. In particular, in the embodiment according to 1 Also, a second bypass with an electrically controlled switching unit can be used.

LIST OF REFERENCE NUMBERS

1

clutch Master or encoder unit

1'

donor reservoir

1''

master piston

2

clutch slave or recipient unit

2 '

takers reservoir

2 ''

slave piston

3

hydraulic track

4

cover

5

Bypass, in particular first bypass

6

check valve

7

feather

8th

pedal

9

Bypass, especially second bypass

10

switching

11

blocking position

12

Passage position

13

electromagnet

14

Energy storage element

15

Hydraulic storage unit

15 '

reservoir

15 ''

piston

16

feather

L1

Primärteitung

L2

secondary line

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102008058674 A1 [0002]
• - DE 3628774 A1 [0003]
• - JP 62270834 [0003]

Claims (15)

Clutch actuation device for opening and closing a clutch comprising a hydraulic device with a transmitter unit ( 1 ) and a recipient unit ( 2 ), between which a hydraulic line ( 3 ), the transmitter unit ( 2 ) by means of a coupling activator ( 8th ) can be acted upon with pressure, which via the hydraulic line to the slave unit ( 2 ) is transferable, and in the hydraulic line ( 3 ) at least one aperture ( 4 ) for reducing the pressure transfer to the receiving unit ( 2 ), characterized in that between the coupling activator ( 8th ) and the aperture ( 4 ) at least one energy storage element ( 7 ; 14 ) is arranged, in which at least a part of the of the coupling activator ( 8th ) generated pressure energy can be stored. Clutch actuating device according to claim 1, characterized in that a in the energy storage element ( 7 ; 14 ) stored energy portion delayed in the hydraulic line ( 3 ) is deliverable. Clutch actuating device according to claim 1 or 2, characterized in that the energy storage element ( 7 ; 14 ) between coupling activator ( 8th ) and transmitter unit ( 1 ) and / or between encoder unit ( 1 ) and aperture ( 4 ) is provided. Clutch actuating device according to one of the preceding claims, characterized in that the energy storage element of at least one spring ( 7 ) is formed. Clutch actuation device according to one of the preceding claims, characterized in that the energy storage element at least one hydraulic unit ( 15 ). Clutch actuating device according to the preceding claim, characterized in that the hydraulic unit ( 15 ) by at least one spring ( 16 ) is prestressed. Clutch actuating device according to the preceding claim, characterized in that the hydraulic unit ( 15 ) of the energy storage element a piston ( 15 '' ) or a membrane, which by means of the spring ( 16 ) are biased. Clutch actuating device according to one of the preceding claims, characterized in that the diaphragm ( 4 ) has a variable flow area. Clutch actuating device according to one of the preceding claims, characterized in that the clutch activator as a pedal ( 8th ) is trained. Clutch actuating device according to the preceding claim, characterized in that a spring provided as an energy storage element ( 7 ) at least approximately parallel along the longitudinal direction of the pedal ( 8th ) is arranged. Clutch actuating device according to one of the preceding claims, characterized in that on the hydraulic line ( 3 ) a bypass ( 5 ) around the aperture ( 4 ) is provided in which a check valve ( 6 ) is arranged. Clutch actuating device according to one of the preceding claims, characterized in that between the transmitter unit ( 1 ) and recipient unit ( 2 ) an electrically switchable switching unit ( 10 ) is provided which at least between a blocking position ( 11 ) and a passage position ( 12 ) is switchable. Clutch actuating device according to the preceding claim, characterized in that the switching unit ( 12 ) in a bypass ( 9 ) on the hydraulic line ( 3 ) around the aperture ( 4 ) is arranged. Clutch actuating device according to one of the preceding claims, characterized in that a control unit for controlling the switching unit ( 12 ) and / or the diaphragm ( 4 ) is provided. Clutch actuating device according to one of the preceding claims, characterized in that the energy storage element ( 7 ; 14 ) as passive delay means for delaying the pressurization of the receiver unit ( 2 ) is trained.