DE102019114428A1 - Coupling cylinder for a coupling device and coupling arrangement with the coupling cylinder - Google Patents

Abstract

Clutch cylinders are known which are used, for example, in the vehicle sector for actuating clutches. It is the object of the invention to propose a clutch cylinder with a high level of tightness against the entry of foreign particles and a ventilation system , the cylinder housing 2 having a pressure chamber 4 for receiving the actuating piston (5), the actuating piston 5 being arranged axially displaceably in the pressure chamber 4, with a bellows 7, which has an end section 7a on the cylinder housing 2 and a further end section 7b is arranged on the actuating piston 5, with an intermediate space 8, the intermediate space 8 being formed outside the pressure space 4 between the cylinder housing 2 and the bellows 7, the cylinder housing 2 having a ventilation duct 12 for ventilation and / or venting of the intermediate space 8 .

Description

The invention relates to a clutch cylinder for a clutch device with the features of the preamble of claim 1. Furthermore, the invention relates to a clutch arrangement with the clutch cylinder.

Clutch cylinders are known which are used, for example, in the vehicle sector for actuating clutches. Such clutch cylinders usually have a housing with a pressure chamber in which an axially displaceable piston is guided. By actuating a clutch pedal, the piston arranged in the pressure chamber is axially displaced so that the clutch is actuated. To protect internal system components of the clutch cylinder, such as Pistons, sealing ring carriers, seals, etc., it is known to use bellows, which shield them from dirty water, dust, sand, etc. In order to be able to guarantee a high level of security against these external influences, the bellows is tightly connected to protect the internal system components. Due to the closer connection of the bellows, the displaced air in the system must be evacuated when actuated in order to prevent the bellows from inflating.

The pamphlet DE 10 2016 219 592 A1 , which probably forms the closest prior art, discloses a slave cylinder for a hydraulic release system for actuating a friction clutch, with a housing and at least one pressure chamber formed in this, in which a piston is axially displaceable for actuating a release bearing. The release bearing has a bearing inner ring lying radially on the inside and a bearing outer ring lying radially on the outside and is preloaded via a preload spring which is arranged radially outside the pressure chamber. The slave cylinder has a support ring which is in operative connection with the release bearing and on which the preload spring is axially supported, the support ring having at least one holding means on which a dirt protection is axially fixed to prevent dirt from entering the pressure chamber. The support ring is made of sheet metal.

It is the object of the present invention to propose a clutch cylinder which is characterized by a high level of tightness against the entry of foreign particles and also by ventilation.

This object is achieved by a clutch cylinder with the features of claim 1 and a clutch arrangement with the features of claim 8. Preferred or advantageous embodiments of the invention emerge from the subclaims, the following description and the attached figures.

The invention relates to a clutch cylinder which is designed and / or suitable for a clutch device. The clutch cylinder is used in particular to actuate the clutch device. The clutch cylinder can be actuated hydraulically and / or pneumatically. The clutch cylinder is preferably designed as a slave cylinder, particularly preferably as a concentric slave cylinder (CSC). The concentric slave cylinder is particularly preferably designed as a central release mechanism. In particular, the clutch cylinder is arranged and / or can be arranged coaxially and / or concentrically around a shaft, in particular a gear shaft of a transmission.

The clutch cylinder has an actuating piston which is designed and / or suitable for transmitting an actuating force to the coupling device. The clutch cylinder preferably has a release bearing which is designed and / or suitable for transmitting the actuating force from the actuating piston to the coupling device. The actuating piston and the release bearing are preferably operatively connected to one another and / or coupled in terms of movement, so that a movement of the actuating piston is transmitted to the release bearing.

The clutch cylinder has a cylinder housing. In particular, the cylinder housing is designed as a hollow cylindrical and / or ring-shaped housing. The cylinder housing preferably has a central through opening, in particular a bore, through which the shaft can be passed when the clutch cylinder is installed. The cylinder housing is designed in particular as a plastic housing or as a sheet metal housing.

The cylinder housing has a pressure chamber which is designed and / or suitable for receiving the actuating piston. In particular, the pressure space is designed as an annular space encircling a main axis, which is delimited in one axial direction and open in an opposite axial direction. In particular, the actuating piston is designed as an annular piston which delimits and / or seals the pressure chamber in the opposite axial direction. The actuating piston and the housing are particularly preferably arranged coaxially and / or concentrically to one another with respect to a main axis.

The actuating piston can be axially displaced in the pressure chamber, in particular when the clutch cylinder is actuated. For this purpose, the pressure chamber can be filled with an operating medium, for example hydraulic oil or compressed air, the pressure on the operating medium being changed when the clutch cylinder is actuated. The actuating force is generated due to the increasing pressure in the pressure chamber and transmitted to the actuating piston so that it is moved axially in the pressure chamber.

The clutch cylinder has a bellows which is designed and / or suitable in particular to protect against the entry of foreign particles between the cylinder housing and the piston. In addition to the entry of dirt and dust particles, an entry of liquids, e.g. Splash water, moisture, etc. to understand. The bellows preferably has a plurality of folds which are arranged one behind the other in the axial direction and which can be folded up and unfolded in the axial direction with respect to the main axis. In particular, the bellows is designed as a cylindrical or conical bellows. The bellows is preferably arranged coaxially and / or concentrically to the cylinder housing with respect to the main axis.

The bellows is arranged on the one hand with one end section on the cylinder housing and on the other hand in an opposite direction with a further end section on the actuating piston, preferably on the release bearing. The end section and / or the further end section are preferably designed as flange-like end sections. In particular, the end section rests on the cylinder housing in a sealing, preferably fluid-tight manner.

The clutch cylinder has an interspace, the interspace being formed outside the pressure space between the cylinder housing and the bellows. In particular, the intermediate space is separated from the pressure space in a fluid-tight manner. The intermediate space is preferably delimited in a radial direction by the bellows and in a radial opposite direction by the cylinder housing. In an axial direction, the intermediate space is preferably delimited by the cylinder housing and in an opposite axial direction by the piston and / or the bearing device. The intermediate space is preferably designed as a drying space.

In the context of the invention, it is proposed that the cylinder housing has a ventilation channel which is designed and / or suitable for ventilating and / or venting the intermediate space. In particular, the space is fluidically connected to an environment via the ventilation duct. The ventilation duct preferably runs in sections in the axial direction and in the radial direction and / or in the circumferential direction with respect to the central axis. In an installation situation, the ventilation duct preferably ends in an upper region of the cylinder housing in the space. In an installation situation, the ventilation duct particularly preferably ends in a lower or central region of the cylinder housing in an ambient geometry.

The advantage of the invention is in particular that a fluid-tight connection of the bellows can be implemented through the arrangement of a ventilation duct in the cylinder housing and at the same time ventilation of the space is ensured when the clutch cylinder is actuated. In addition, by suitably designing the ventilation duct in the housing, a complex duct routing can be implemented, so that the entry of foreign particles into the intermediate space via the ventilation duct is avoided.

In a preferred embodiment of the invention it is proposed that the ventilation duct have at least or precisely one entry interface into the intermediate space and at least or precisely one exit interface from the cylinder housing. In particular, the ventilation channel between the entry interface and the exit interface is closed and / or is designed to be continuous and / or uninterrupted and / or open in sections. The entry interface is preferably designed as a free entry and the exit interface as a free exit. In particular, it can be provided that the ventilation duct has several of the inlet interfaces and / or the outlet interfaces. The multiple entry and / or exit interfaces are fluidly connected to one another via multiple ventilation ducts and / or a common duct system.

According to this embodiment, the ventilation duct has a course that rises at least in sections from the exit interface to the entry interface. The ventilation duct preferably rises immediately after the exit interface in the direction of the entry interface, so that the entry of foreign particles is prevented and / or foreign particles, in particular dirt particles or liquids that are already in the ventilation duct, flow off again. In an installation situation, the entry interface is preferably arranged at least approximately in a 12 o'clock position. A 12 o'clock position is to be understood as an arrangement of the entry interface in relation to an imaginary dial which extends in a radial plane of the main axis. At least approximately “12 o'clock” can include a deviation to a 1 o'clock position or an 11 o'clock position. In particular, the exit interface is arranged at least approximately in a 3 o'clock position or a 9 o'clock position or in a 6 o'clock position, the ventilation duct being separated from the Exit interface runs in or counterclockwise increasing in the direction of the entry interface. It can optionally be provided that the ventilation duct has a descending course after the rising course. In particular, the ventilation duct can have an alternating ascending and descending course.

Thus, a ventilation duct is proposed which, due to the rising duct course, is characterized by a particularly simple and efficient separation of foreign particles in the area of the exit interface. In this way, the gap can be protected against the entry of foreign particles.

In a further preferred embodiment of the invention it is proposed that the ventilation duct have several duct sections, the duct sections joining one another at an angle so that a labyrinth is formed. The channel sections preferably adjoin one another at least approximately at right angles. In this context, “approximately at right angles” is to be understood as meaning angular deviations of more than +/- 5 degrees and / or less than +/- 15 degrees. In particular, the ventilation duct is deflected more than once, preferably more than three times, in particular more than five times. The ventilation duct thus has in particular at least two, preferably at least three, in particular at least five duct sections which are arranged at an angle to one another. The channel sections preferably adjoin one another at an angle either in the radial direction and / or in the axial direction with respect to the main axis.

Thus, a ventilation duct is proposed which, due to the angled, in particular multiply angled duct routing, prevents foreign particles, in particular dust particles or dirt particles, from entering the space directly.

In a preferred specification, it is provided that the cylinder housing has a contact section for contact with a centering surface, in particular a coupling housing, and a cylinder section adjoining the contact section for forming the pressure chamber. In particular, the contact section extends in a flange-like manner in a radial plane of the main axis to the cylinder section. The cylinder section preferably has an outer wall and an inner wall, the pressure space being formed radially between the outer wall and the inner wall. The bellows is arranged on the contact section, preferably in a fluid-tight manner, the intermediate space being delimited in the radial direction by the bellows and in the opposite radial direction by the cylinder section. In the axial direction, the space is delimited by the contact section, the ventilation duct being introduced into the contact section and / or penetrating it. In particular, the cylinder section extends coaxially to the main axis, the intermediate space preferably being designed as a further annular space arranged coaxially and / or concentrically to the pressure space.

In a preferred development it is provided that the contact section has a contact surface in an axially opposite direction which is designed and / or suitable for contact with the centering surface. In particular, the contact surface extends in a radial plane of the main axis. The contact surface is preferably designed at least approximately, in particular in a coarse shape, as a circular surface, in particular a circular ring surface. In this case, at least or precisely one channel section of the ventilation channel is introduced into the contact surface as a recess. In particular, the channel section designed as a recess is designed to be open at the end, with the channel section being closed at the end by the centering surface in the installation situation. The channel section can be designed in the shape of a channel and / or groove. Preferably, all of the channel sections introduced into the contact surface are designed as depressions. In particular, the channel sections introduced as a recess are introduced into the cylinder housing by primary molding, in particular by a plastic injection molding process.

It is therefore a consideration of the invention to propose a ventilation duct which is characterized by simple manufacture. The ventilation duct can be manufactured in a particularly simple manner due to the design as a recess made in the contact surface.

In a further preferred embodiment it is provided that the clutch cylinder has a spring device which is designed and / or suitable for preloading the actuating piston. The spring device is preferably designed as a compression spring, in particular as a helical compression spring. The spring device is arranged in the intermediate space, the spring device being supported on the one hand by a support ring on the cylinder housing and on the other hand by a further support ring on the actuating piston, in particular the release bearing. In particular, the spring device is arranged coaxially and / or concentrically to the cylinder housing with respect to the main axis. The support ring is designed in particular as an annular sheet metal or plastic component which is arranged coaxially with respect to the main axis. The end section of the bellows is preferably received in a non-positive manner between the housing and the support ring. The support ring is designed in such a way that it has a spring force Can accommodate spring device and transfer this to the end portion. The end section is thus actively pressed against the housing via the spring device. The spring device is dimensioned in such a way that the end section is permanently acted upon by the spring force in all tolerance positions, in particular when the clutch device is actuated, and is thus pressed against the housing. The end section is preferably formed from an elastic material, the end section being elastically deformed and / or deformable between the housing and the support ring.

According to this embodiment, the support ring has at least or precisely one opening in the area of the ventilation duct, so that the entry interface is formed. In particular, the ventilation duct is fluidically connected to the intermediate space via an opening. The opening is preferably arranged outside a contact area of the spring device. The opening can be designed as a bore or a cutout. In particular, the support ring has several of the openings, so that the several entry interfaces are formed.

It is therefore a consideration of the invention to propose a clutch cylinder with a particularly compact design, since the arrangement of the entry interface in the support ring means that no additional installation space has to be made available for the support ring outside the entry interface. In addition, a further labyrinth can be formed by the openings made in the support ring.

In a specific development it is provided that the contact section has a support surface in the axial direction, which is designed and / or suitable for supporting the support ring. In particular, the support surface extends on an axial end face of the contact section facing away from the contact surface in a further radial plane of the main axis. The support surface is preferably designed at least approximately, in particular in a rough shape, as a further circular ring surface. In particular, the support ring rests on the support surface in sections in the opposite axial direction. In this case, at least or precisely one channel section of the ventilation channel in the support surface is designed as a recess introduced in the axial direction and delimited by the support ring in the opposite axial direction. In particular, the channel section designed as a recess is designed to be open at the end, the support ring delimiting the channel section in such a way that a closed fluid channel is formed. The at least one channel section can be designed in the shape of a channel and / or groove. Preferably, all of the channel sections introduced into the support surface are designed as depressions. The support ring is preferably arranged with its opening in such a way that the channel section introduced into the support surface as a recess is fluidically connected to the intermediate space via the opening.

It is therefore a consideration of the invention to propose a ventilation duct which is characterized by simple manufacture. The ventilation duct can be manufactured in a particularly simple manner due to the design as a recess made in the support surface. In addition, a further labyrinth guide for the ventilation duct can be implemented.

Another object of the invention relates to a clutch arrangement with the clutch cylinder as already described above. The clutch assembly has a clutch housing, the cylinder housing of the clutch cylinder being mounted on the clutch housing. In particular, for this purpose the cylinder housing is fastened to the coupling housing with the contact section in a form-fitting and / or force-fitting manner. The coupling housing preferably has a centering collar, the cylinder housing, in particular the contact section, being centered on the coupling housing via the centering collar, in particular in the radial and / or axial direction and / or in the circumferential direction with respect to the main axis. The centering collar is preferably designed as a circumferentially uninterrupted centering collar. In particular, the clutch housing is designed as a so-called transmission bell housing.

According to this embodiment, the ventilation duct is formed at least in sections between the cylinder housing and the clutch housing. In particular, the fluid channel extends radially outward in the direction of the centering collar, the exit interface ending between the cylinder housing and the centering collar. The exit interface preferably ends in a radial gap formed between the centering collar and the cylinder housing. Alternatively, the fluid channel extends radially inward in the direction of the shaft, the exit interface ending between the cylinder housing and the centering surface. Alternatively, the fluid channel extends axially in the direction of the transmission housing, the outlet interface ending, for example, in the clutch housing.

In a further specification, it is provided that the clutch housing has the centering surface on an axial end face. In particular, the centering surface extends in a further radial plane of the main axis. The centering surface is preferably designed as a flat surface, with the contact surface resting flat, in particular flat and / or flat, on the centering surface in the installation situation. The ventilation duct, designed as a recess, is in the axial direction through the centering surface of the coupling housing Limited opposite direction. In particular, the channel section designed as a recess is designed to be open at the end, the centering surface delimiting the channel section in such a way that a closed fluid channel is formed. The fluid channel is thus preferably designed to be continuously closed between the inlet interface and the outlet interface.

In a further preferred implementation, an air flow path runs from the intermediate space via the inlet interface and the ventilation duct through the cylinder housing and via the outlet interface between the cylinder housing and the clutch housing into an environment. In particular, air can flow from the interspace into the surroundings for venting the interspace, as well as air from the surroundings into the interspace along the air flow path. When the clutch cylinder is disengaged, the clutch cylinder thus sucks air from the environment via the air flow path into the space. When the clutch cylinder is engaged, the air is blown out of the space via the air flow path into the environment.

• 1 eine schematische Schnittdarstellung eines Kupplungszylinder als ein Ausführungsbeispiel der Erfindung;
• 2 eine axiale Ansicht einer Unterseite des Kupplungszylinders der 1;
• 3a eine schematische Schnittdarstellung einer Kupplungsanordnung mit dem Kupplungszylinder aus 1;
• 3b in gleicher Darstellung wie 2 eine Detailansicht des Zylindergehäuses;
• 4 eine weitere schematische Schnittdarstellung der Kupplungsanordnung der 3a.

Further features, advantages and effects of the invention emerge from the following description of preferred exemplary embodiments of the invention. Show:

• 1 a schematic sectional view of a clutch cylinder as an embodiment of the invention;
• 2 an axial view of an underside of the clutch cylinder of FIG 1 ;
• 3a a schematic sectional view of a clutch arrangement with the clutch cylinder 1 ;
• 3b in the same representation as 2 a detailed view of the cylinder housing;
• 4th a further schematic sectional view of the coupling arrangement of FIG 3a .

1 shows a schematic sectional view of a clutch cylinder 1 for a coupling device, not shown, as an embodiment of the invention. The clutch cylinder 1 is designed as a concentric slave cylinder (CSC) and is used to actuate the clutch device. For example, the clutch cylinder 1 installed in a drive train of a motor vehicle.

The clutch cylinder 1 has a cylinder housing 2 on. The cylinder housing 2 is designed as a cylindrical ring housing and can be made of plastic, for example. The cylinder housing has an abutment section 2a and a cylinder section 2 B on, the cylinder section 2 B directly to the plant section 2a connects. The plant section 2a extends outward in a radial direction and can be designed like a flange. The cylinder section 2 B is designed as a hollow cylinder and has a central through opening 3 on, for example in an installation situation of the clutch cylinder 1 , a transmission shaft of a transmission of the drive train through the through opening 3 is led. The clutch cylinder 1 is arranged, for example, concentrically to the transmission shaft.

The cylinder section 2 B forms a pressure space 4th , with an actuating piston 5 in the pressure room 4th in the axial direction with respect to a main axis H is movably recorded. For example, the clutch cylinder 1 hydraulically operated, the pressure chamber 4th this is filled with a hydraulic operating medium, such as hydraulic oil. The printing room 4th is designed as an annular space which extends in an axial direction AR through the housing 2 limited and in an opposite axial direction GR is open. The actuating piston 5 is designed as an annular piston and lies in the radial direction with respect to the main axis H sealing to the pressure space 4th so that the pressure chamber 4th in the opposite axial direction GR through the actuating piston 5 is limited or sealed.

The clutch cylinder 1 has a release bearing 6th on, with the release bearing 6th with the actuating piston 5 is in operative connection. The release bearing 6th has an inner ring 6a and an outer ring 6b on. Between the inner and outer rings 6a , b are a plurality of rolling elements 6c arranged rolling. The actuating piston 5 is used to transmit an actuating force F1 at least in the axial direction with respect to the main axis H form-fit with the inner ring 6a connected. For example, the pressure space 4th Connected via a hydraulic path to a master cylinder of the clutch device, not shown, wherein when the master cylinder is actuated, for example by pressing a clutch pedal, a hydraulic column is displaced in the direction of the slave cylinder and the actuating force F1 is produced. The actuating piston is thereby 5 and thus the storage facility 6th in the opposite axial direction GR moves and the operating force F1 Transfer via the bearing device, for example, to a diaphragm spring of the coupling device.

To protect the pressure chamber 4th against external influences such as dirty water, dust, sand etc., the clutch cylinder 1 a bellows 7th on. The bellows 7th is designed as a cylindrical bellows and has several folds arranged axially one behind the other, which cause an axial change in length of the bellows 7th at a Actuation of the clutch cylinder 1 enable. The bellows 7th is in the axial direction AR on the housing 2 and in the opposite axial direction GR on the inner ring 6a attached. In relation to the main axis H is the bellows 7th concentric to the housing 2 arranged.

Between the cylinder housing 2 and the bellows 7th is a space 8th formed, the gap 8th forms a drying room. In the axial direction AR is the space in between 8th through the plant section 2a and in the opposite axial direction GR through the release bearing 6th limited. In a radial direction RR is the space in between 8th through the bellows 7th and in a radial opposite direction RG through the cylinder section 2 B limited.

The clutch cylinder 1 has a spring device 9 on which to preload the bearing device 6th trained and / or suitable. The spring device 9 is designed as a helical compression spring and acts on the bearing device 6th in the opposite axial direction GR with a spring force F2 . The spring device is for this purpose 9 between the plant section 2a and the storage facility 6th arranged, wherein the spring device 9 in the axial direction AR at the plant section 2a and in the opposite axial direction GR at the storage facility 6th supports. The spring device 9 is inside the gap 8th and in relation to the main axis H concentric with the cylinder section 2 B arranged.

The clutch cylinder 1 has a support ring 10 to support the spring device 9 at the plant section 2a and another support ring 11 to support the spring device 9 at the storage facility 6th on. The two support rings are for this purpose 10 , 11 each designed as a stepped cylinder sleeve, the spring device 9 each with an end turn on a step of the support ring 10 , 11 is supported. The bellows 7th has an end portion 7a and another end portion 7b on, the end section 7a on the support ring 10 and the further end section 7b on the further support ring 11 is set fluid-tight. The support ring 10 is about the spring device 9 in the axial direction AR frictionally with the contact section 2a permanently connected, the end section 7a between the support ring 10 and the attachment section 2a is arranged free of play. The other support ring 11 is about the spring device 9 in the opposite axial direction GR at least frictionally with the inner ring 6a connected, the further end portion 7b on a radial outside of the further support ring 11 non-positively and / or positively, e.g. B. via a press fit, with the further support ring 11 is connected fluid-tight.

Thus is the gap 8th sealed against the entry of foreign particles, for example dirty water, dust, sand, etc., so that the gap 8th and thus the pressure chamber 4th is protected against these external influences. When the clutch cylinder is actuated 1 the volume of the space changes 8th , with an almost completely sealed gap 8th this volume difference in air must be introduced or discharged in a targeted manner through a ventilation system. The cylinder housing 2 a ventilation duct 12th on which the gap 8th connects fluidically with an environment. A foreign particle entry from outside into the space 8th to prevent the ventilation duct 12th minimize this effect as much as possible. The ventilation duct is for this purpose 12th realized as a labyrinth channel, whereby the suction of foreign particles can be prevented by a channel guide which is angled several times.

The duct routing is illustrated in the following figures using different representations and sections, as in 2 indicated, explained. It shows 2 in an axial view with respect to the main axis H a bottom of the clutch cylinder 1 , wherein a first and a second channel section 12a , b of the ventilation duct 12th at the bottom in the system section 2a are introduced as a recess.

The first channel section 12a ends with an exit interface AS in a vicinity of the cylinder housing 2 , where the exit interface AS is directed radially outward. The second channel section 12b adjoins the first channel section at approximately right angles to form a labyrinth 12a and extends from the exit interface AS in the circumferential direction around the main axis H to a third channel section 12c , which the plant section 2a penetrated in the axial direction. The second channel section 12b points in an installation situation of the clutch cylinder 1 from the exit interface AS in the direction of the third channel section 12c an increasing course. In the illustration shown is the exit interface AS approximately in a so-called 3 o'clock position and the third channel section 12b located approximately at a 1 o'clock position, with the second channel section 12b counterclockwise from the exit interface AS in the direction of the second channel section 12b runs in a circular arc. The rising channel guide can thus prevent dirt or dirty water from entering the third channel section directly 12c and thus into the space 8th can flow in and / or already in the first and / or second channel section 12a , b dirt or dirty water can flow away again.

3a shows in a longitudinal section AA, as in 2 shown along the main axis H a clutch assembly 13 . The clutch assembly 13 has a clutch housing 14th , only indicated schematically, which is designed, for example, as a so-called gear bell housing. The clutch housing 14th has a centering collar 14a and a centering surface 14b on, the attachment section 2a with a contact surface 15th in the axial direction AR on the centering surface 14b and in the radial direction RR on the centering collar 14a is centered. The plant section 2a lies outside the first and second channel sections 12a , b with its contact surface 15th flat on the centering surface 14b so that the centering surface 14b the two channel sections 12a , b in the opposite axial direction GR seals.

The circumferential centering collar 14a limits the exit interface AS in the axial direction AR so that a radial gap 16 , as a further channel section, to form a further labyrinth between the centering collar 14a and a radial outside of the abutment section 2a is formed. The first channel section 12a is across the gap 16 fluidically connected to the environment, with an air flow path LS across the radial gap 16 in the axial direction AR to the exit interface AS and then in the opposite radial direction RG via the exit interface AS and the first channel section 12a to the second channel section 12b runs.

As in 3b shown, the air flow path is LS along the second channel section 12b with a rising course to the third channel section 12c , wherein in the installation situation the first and the second channel section 12a , b through the centering surface 14b are limited so that the air flow path LS is defined.

4th shows in a longitudinal section BB, as in 2 shown along the main axis H the clutch assembly 13 . The plant section 2a has a support surface 17th on, with the support ring 10 in the axial direction AR on the support surface 17th is supported all around. The support surface 17th extends in a radial plane of the main axis H and is designed, for example, as an annular surface.

In the support surface 17th is a fourth channel section 12d introduced as a recess, the fourth channel section 12d at right angles to the third channel section 12c connects and for example in the radial opposite direction RG and / or in the circumferential direction around the main axis H towards an input interface IT extends so that another labyrinth is formed. The fourth canal section 12d is in the opposite axial direction GR through the support ring 10 limited so that it is designed as a closed channel.

To form the entry interface IT shows the support ring 10 at least one breakthrough 18th so that the space in between 8th aerodynamically with the ventilation duct 12th connected is. The fourth canal section 12d is thus additionally supported by the support ring 10 covered, whereby an additional angle guide and thus a further labyrinth is formed against possible foreign particle entry.

The air flow path LS thus runs from the third channel section 12c to the fourth channel section 12d and via the entry interface IT in the space 8th . Thus, air from the outside can pass through the air flow path LS in the space 8th flow in when the air volume of the gap 8th when the clutch cylinder is actuated 1 is increased. In addition, air can escape from the space in between 8th via the air flow path LS flow into the environment when the air volume of the space 8th when the clutch cylinder is actuated 1 is reduced.

A duct guide is thus proposed which, as required, leads air out of the interior of the system or leads it into the interior of the system, with an entry of foreign particles into the space 8th is greatly reduced. In addition, the ducting inside the housing base prevents dirt or dirty water from getting inside the coupling housing 14th in the space 8th is sucked. In addition, the channel sections are angled several times 12a to d a labyrinth guide within the cylinder housing 2 realized, which greatly reduces or prevents the entry of dirt such as dust or sand.

List of reference symbols

1

Clutch cylinder

2

Cylinder housing

2a

Plant section

2 B

Cylinder section

3

Through opening

4th

Printing room

5

Actuating piston

6th

Storage facility

6a

Inner ring

6b

Outer ring

6c

Rolling elements

7th

Bellows

7a, b

End sections

8th

Space

9

Spring device

10

Support ring

11

further support ring

12

Ventilation duct

12a - d

Duct sections

13

Clutch assembly

14th

Clutch housing

14a

Centering collar

14b

Centering surface

15th

Contact surface

16

gap

17th

Support surface

18th

breakthrough

H

Main axis

F1

Actuation force

F2

Spring force

AS

Exit interface

IT

Input interface

LS

Air flow path

AR

axial direction

GR

axial opposite direction

RR

radial direction

RG

radial opposite direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016219592 A1 [0003]

Claims (10)

Coupling cylinder (1) for a coupling device, with an actuating piston (5) for transmitting an actuating force (F1) to the coupling device, with a cylinder housing (2), the cylinder housing (2) having a pressure chamber (4) for receiving the actuating piston (5) wherein the actuating piston (5) is arranged axially displaceably in the pressure chamber (4), with a bellows (7), the bellows (7) with one end section (7a) on the cylinder housing (2) and with a further end section ( 7b) is arranged on the actuating piston (5), with an interspace (8), the interspace (8) being formed outside the pressure chamber (4) between the cylinder housing (2) and the bellows (7), characterized in that the The cylinder housing (2) has a ventilation duct (12) for ventilating and / or venting the intermediate space (8). Clutch cylinder (1) Claim 1 , characterized in that the ventilation duct (12) has an entry interface (ES) into the intermediate space (8) and an exit interface (AS) from the cylinder housing (2), the ventilation duct (12) from the exit interface (AS) to the entry interface (ES) has an increasing profile, at least in sections. Clutch cylinder (1) Claim 1 or 2 , characterized in that the ventilation duct (12) has a plurality of duct sections (12a, b, c, d), the duct sections (12a, b, c, d) joining one another at an angle, so that a labyrinth is formed. Clutch cylinder (1) according to one of the preceding claims, characterized in that the cylinder housing (2) has a contact section (2a) for contact with a centering surface (14a) and a cylinder section (2b) adjoining the contact section (2a) to form the pressure chamber (4), wherein the bellows (7) is arranged with the end section (7a) on the contact section (2a) so that the gap (8) in a radial direction (RR) through the bellows (7) and in a radial opposite direction (RG) is delimited by the cylinder section (2b) and the space (8) is delimited in an axial direction (AR) by the contact section (2a), the ventilation duct (12) being introduced into the contact section (2a) and / or this interspersed. Clutch cylinder (1) Claim 4 , characterized in that the contact section (2a) has a contact surface (15) for contact with the centering surface (14b), at least one channel section (12a, b) of the ventilation duct (12) in the opposite axial direction (GR) in the contact surface ( 15) is introduced as a recess so that the at least one channel section (12a, b) can be delimited by the centering surface (14b) in the axial direction (AR). Clutch cylinder (1) according to one of the preceding claims, characterized by a spring device (9) for preloading the actuating piston (5), the spring device (9) being arranged in the intermediate space (8) and on the one hand above a support ring (10) on the cylinder housing (2) and on the other hand is supported on the actuating piston (5) via a further support ring (11), the support ring (10) having at least one opening (18) in the area of the ventilation duct (12) so that the input interface (ES) is formed . Clutch cylinder (1) Claim 6 , characterized in that the contact section (2a) has a support surface (17) for supporting the spring device (9), at least one duct section (12d) of the ventilation duct (12) in the axial direction (AR) in the support surface (17) as a Depression is introduced, the at least one channel section (12d) being delimited by the support ring (10) in the opposite axial direction (GR). Clutch arrangement (13) with the clutch cylinder (1) according to one of the preceding claims, characterized by a clutch housing (14), the cylinder housing (2) of the clutch cylinder (1) being mounted on the clutch housing (14), the ventilation duct (12) is formed at least in sections between the cylinder housing (2) and the clutch housing (14). Coupling arrangement (13) according to Claim 8 , characterized in that the coupling housing (14) has the centering surface (14b) on an axial end face, the cylinder housing (2) with the contact surface (15) flat on the centering surface (14b) outside of the channel sections introduced into the contact surface (15) (12a, b) is applied so that the channel sections (12a, b) are delimited in the opposite axial direction (GR) by the centering surface (14b). Coupling arrangement (13) according to Claim 8 or 9 , characterized in that an air flow path (LS) runs from the intermediate space (8) via the inlet interface (ES) and via the ventilation duct (12) through the cylinder housing (2) and via the outlet interface (AS) between the coupling housing (14) and the cylinder housing (2) extends into an environment.

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