DE102017130363A1 - Pressure line element for a pressure limiter - Google Patents

Abstract

The invention relates to a pressure line element (1) for a pressure limiter (2), comprising at least the following components: - a pressure cylinder (3) with a central axis (4) and with an inner wall (5); and an axial stop member (7) held in the impression cylinder (3) in an axial position, the axial stop member (7) forming a radial interference fit (8) for maintaining its axial position with the inner wall (5) of the impression cylinder (3) , The pressure line element (1) is characterized in particular in that the inner wall (5) forms a radially inwardly directed projection (9, 10) on the radial press fit (8), the projection (9, 10) forming the axial position of the axial stop element (7) secures and / or an insertion side (11) of the Axialanschlagelements (7) is conically formed and with the inner wall (5) in radial compression contact. With the proposed here pressure line element a significantly increased security against component failure is achieved, at the same time only small and space-neutral adjustments to a conventional pressure line element must be performed.

Description

• - einen Druckzylinder mit einer Zentralachse und mit einer Innenwandung; und
• - ein Axialanschlagelement, welches in dem Druckzylinder in einer axialen Position gehalten ist,

wobei das Axialanschlagelement zum Halten seiner axialen Position mit der Innenwandung des Druckzylinders einen Radialpresssitz bildet. Das Druckleitungselement ist vor allem dadurch gekennzeichnet, dass
die Innenwandung beim Radialpresssitz zumindest einseitig einen nach radial innen gerichteten Vorsprung bildet, wobei der Vorsprung die axiale Position des Axialanschlagelements sichert und/oder
eine Einschubseite des Axialanschlagelements konisch gebildet ist und mit der Innenwandung in radialem Presskontakt steht. Weiterhin betrifft die Erfindung einen Druckbegrenzer für ein hydraulisches oder pneumatisches System mit einem solchen Druckleitungselement, ein hydraulisches oder pneumatisches System mit einem solchen Druckbegrenzer, sowie ein Kraftfahrzeug mit einem solchen hydraulischen oder pneumatischen System.The invention relates to a pressure line element for a pressure limiter, comprising at least the following components:

• - An impression cylinder with a central axis and with an inner wall; and
• an axial stop element, which is held in the pressure cylinder in an axial position,

wherein the axial stop member forms a radial interference fit for maintaining its axial position with the inner wall of the impression cylinder. The pressure line element is mainly characterized in that
the inner wall of the Radialpresssitz at least one side forms a radially inwardly directed projection, wherein the projection secures the axial position of the Axialanschlagelements and / or
an insertion side of the axial stop element is conically formed and is in radial press contact with the inner wall. Furthermore, the invention relates to a pressure limiter for a hydraulic or pneumatic system with such a pressure line element, a hydraulic or pneumatic system with such a pressure limiter, and a motor vehicle with such a hydraulic or pneumatic system.

Pressure limiters with a pressure line element for hydraulically operated friction clutches are known from the prior art, by means of which a pressure change rate can be limited to a maximum speed. For this purpose, a pressure control element, which forms an axially movable baffle plate in the pressure medium flow, is provided. The pressure control element has a first passage, for example centrally, and a second passage, for example a plurality of eccentrically arranged openings. In a first position, preferably adjacent to a stop, both the first passage and the second passage can be flowed through. In a second position adjacent to a (other) stop one of the two passages, for example, the second passage, closed. Thus, then only one of the passages, according to the previous example, the first passage, flowed through. Thus, a maximum speed is limited by reducing the flow-through diameter.

For ease of mounting a printing cylinder is formed, in which the pressure control element is inserted on one side. Subsequently, an axial stopper is inserted so that the pressure control member is secured between an end outlet and the axial stopper. The axial stop element forms, preferably in direct contact, a first stop for the pressure control element. The opposite end outlet forms, preferably in direct contact, a second stop for the pressure control element. By means of the first and second stop the axial travel of the pressure control element is fixed. For example, one of the passages in case of concerns on one of the stops, for example, the first stop, closed and preferably both passages can be flowed through, when the pressure control element is applied to the other stop.

For cost-effective implementation, the printing cylinder is a plastic element, for example produced by means of an injection molding process, preferably of a polyamide material (PA), and the Axialanschlagelement is at the position of a corresponding (press) seat in the impression cylinder, preferably in direct contact, pressed ,

In existing series products, it has occurred that the axial stop element, for example made of a polyamide material (PA), has come loose from the press fit. For example, this problem may occur to the customer during a change of components, such as wires or connectors. Here, the temperature influence on the connection plays a major role.

Another series solution with an axial stop element made of a polyphenylene sulfide material (PPS) and a printing cylinder of a polyamide material (PA) has led to an additional problem. Due to the higher rigidity of the material of the Axialanschlagelements, there were breaks on the printing cylinder or the press connection.

On this basis, the present invention has the object, at least partially overcome the known from the prior art disadvantages. The features of the invention will become apparent from the independent claims, to which advantageous embodiments are indicated in the dependent claims. The features of the claims may be combined in any technically meaningful manner, and to this end, the explanations of the following description and features of the figures may be used, which include additional embodiments of the invention.

• - einen Druckzylinder mit einer Zentralachse und mit einer Innenwandung und
• - ein Axialanschlagelement, welches in dem Druckzylinder in einer axialen Position gehalten ist,

wobei das Axialanschlagelement zum Halten seiner axialen Position mit der Innenwandung des Druckzylinders einen Radialpresssitz bildet.The invention relates to a pressure line element for a pressure limiter, comprising at least the following components:

• - a printing cylinder with a central axis and with an inner wall and
• an axial stop element, which is held in the pressure cylinder in an axial position,

wherein the axial stop member forms a radial interference fit for maintaining its axial position with the inner wall of the impression cylinder.

The pressure line element is mainly characterized in that the inner wall forms a radially inwardly directed projection at least on one side at the radial press fit, the projection securing the axial position of the axial stop element.

In the following, reference will be made to the said central axis, if the axial direction, radial direction or the circumferential direction and corresponding terms are used without explicit reference.

The here proposed pressure line element preferably forms part of a pressure limiter, wherein the components described herein are formed partly in one piece with at least one of the other components of the pressure limiter.

The pressure line element has a (part of) a pressure cylinder (s), which is adapted to receive a hydrostatic or pneumatic pressure in the interior, so a line pressure, radially compressive stiff. The pressure medium in the interior of the printing cylinder is guided as far as possible parallel to a central axis of the inner wall of the printing cylinder. The pressure medium is a (compressible) gas, for example air, or an (incompressible) liquid, for example an oil.

In the interior of the printing cylinder, a preferably axially movable functional element is provided, for which the axial stop element is provided for limiting an axial path or for securing a position. The axial stop element is fixed in the printing cylinder. For this purpose, the axial stop element is pressed radially with the inner wall of the impression cylinder directly or via an intermediate element. The functional element is, for example, an axially movable pressure control element, by means of which a pressure or a flow velocity in the interior of the pressure cylinder is variable depending on the axial position of the pressure control element. The travel of the pressure control element is limited by means of the axial stop element in an axial direction.

Here it is now proposed to form on the inner wall a radially inwardly directed projection which limits or prevents at least positive locking an axial movement of the Axialanschlagelements. This ensures that on the one hand the radial force on the inner wall and the Axialanschlagelement is as low as possible interpretable on the inner wall, but at the same time the position is ensured even if a high thermal expansion (-sdifferenz) occurs, which due to a different diameter change to a relaxation of Radialpresssitzes would lead.

The projection is adapted to prevent an automatic release of the Axialanschlagelements in an axial direction or in both axial directions. For this purpose, the radially inwardly directed projection is thus aligned towards the axial stop element or arranged on one end side of the Axialanschlagelements or in the region of the axial extent of the Axialanschlagelements, for example, placed in a groove of the Axialanschlagelements arranged. Particularly preferably, such a projection is formed on both sides of the axial stop element. This makes it possible to use a conventional Axialanschlagelement in which previously could occur a release.

According to an advantageous embodiment of the pressure line element, two projections are formed on both sides of the axial stop element by means of a circumferential groove, and preferably the circumferential groove forms an arc shape in the axial direction.

In this particularly simple embodiment, for example using a conventional pressure line element or conventional printing cylinder as the starting product, a first projection, for example, axially to the left of Axialanschlagelements, and a second projection, for example, axially right of the Axialanschlagelements, by means of a introduced into the inner wall of the impression cylinder Umlaufnut, So both sides of the Axialanschlagelements formed. Thus, it is thus possible to use a conventional pressure cylinder and a conventional axial stop element, wherein the radial force is reduced due to the inner diameter extension in the circulation emergency. At the same time, a securing element is formed by means of axially left and right of the axial stop element of the remaining projections. This works, for example, with an axial stop element with one compared to the impression cylinder of a material with a higher radial thermal expansion and / or of a harder material.

In a preferred embodiment, the circumferential groove forms in the axial direction of an arcuate shape, that is (inversely) convex or concave. As a result, on the one hand an enlarged force introduction surface is formed, so that the radial pressure is reduced, and on the other hand Compression force component formed in the axial direction, which does not support an axial position assurance alone via friction. In addition, a relatively gentle rise with a wedge effect on the Axialanschlagelement is formed, so that due to the wedge effect at a simultaneously relatively low radial pressure, a large axial force is generated, which secures the Axialanschlagelement in position. Thus, it is possible to carry out the projection with only a slight inner diameter constriction, so that the axial stop element can be inserted into its axial position with little stress.

• - einen Druckzylinder mit einer Zentralachse und mit einer Innenwandung; und
• - ein Axialanschlagelement, welches in dem Druckzylinder in einer axialen Position gehalten ist,

wobei das Axialanschlagelement einen Mittenabschnitt zum Halten seiner axialen Position mit der Innenwandung des Druckzylinders aufweist, wobei der Mittenabschnitt einen Radialpresssitz bildet, und
wobei das Axialanschlagelement eine Einschubseite und eine Ausschubseite aufweist, wobei die Einschubseite in eine axiale Montagerichtung weist und bei der Montage als erstes in den Druckzylinder eingeschoben wird und die Ausschubseite in eine axiale Demontagerichtung weist.According to a further aspect, the invention relates to a pressure line element for a pressure limiter, comprising at least the following components:

• - An impression cylinder with a central axis and with an inner wall; and
• an axial stop element, which is held in the pressure cylinder in an axial position,

wherein the axial stop member has a center portion for maintaining its axial position with the inner wall of the impression cylinder, the center portion forming a radial press fit, and
wherein the Axialanschlagelement has an insertion side and a Ausschubseite, wherein the insertion side has in an axial mounting direction and is inserted during assembly first in the impression cylinder and the Ausschubseite facing in an axial disassembly direction.

The pressure line element is mainly characterized in that the insertion side is conical and is in radial press contact with the inner wall.

The pressure line element proposed here comprises a pressure cylinder and an axial stop element which correspond in function to the corresponding components as described above. In that regard, reference is made to the above description.

The axial impact element proposed here usually has a center section which forms a radial press fit with the inner wall of the pressure cylinder. In addition, the Axialanschlagelement has an insertion side and a Ausschubseite, so a (insertion) side, which is inserted axially during assembly as the first in the impression cylinder and a (Ausschub-) side, which is pulled out as the second from the printing cylinder when the Axialanschlagelement to be dismantled again. The insertion side thus points towards the axially movable functional element, for example a pressure control element, and preferably forms with its end face an immediate contact surface for the axial stop of the functional element.

Here, the insertion side is conical, so that the Axialanschlagelement is on the one hand easy to install and on the other hand, an additional pair of pressure is formed, which allows a gentle increase in pressure, for example, with an inner wall flat in the axial direction. Such an axial stop element is preferably usable with a conventional printing cylinder.

According to an advantageous embodiment of the pressure line element, the discharge side is conically formed and communicates with the inner wall in radial press contact.

Such a Ausschubseite facilitates disassembly, but also forms an additional press-contact with the inner wall of the impression cylinder, so that according to one embodiment, the (total) radial force is increased, while maintaining the same or reduced radial pressure. Additionally or alternatively, a gentle increase in pressure is created, for example, in cooperation with an axially flat inner wall.

According to an advantageous embodiment of the pressure line element, the resulting radial force of the press contact of the insertion side and / or the press contact of the Ausschubseite is according to an embodiment as described above equal to or less than the radial force of the central portion on the inner wall.

In this embodiment, the inner wall in the region of the Axialanschlagelements example, in the axial direction is flat, so has no change in inner diameter. In an alternative embodiment, a diameter constriction is provided at the insertion side and / or at the reject side, for example, a conical rise, so that the pressing contact is equal to or slightly less than the radial press fit at the center section. This also makes it possible to increase the transmittable radial force with the same or reduced radial pressure.

According to an advantageous embodiment of the pressure line element with a projection as described above and a conical insertion side and / or Ausschubseite, wherein the pressure cylinder has an outer wall with an outer diameter and the outer diameter is constant in the region of the Radialpresskontakts
wherein preferably the inner wall forms on the push-side adjacent to the radial press fit an axial insertion section with a tapered towards the Axialanschlagelement insertion cone, and
the outer diameter in this towards the Axialanschlagelement wall thickness thickening, particularly preferably constant, is formed.

In this particularly advantageous embodiment, the formation of a projection, which creates an (at least) positive securing element and / or a change in direction or increase of the pressing force, and a gentle pressure distribution due to the shape of the Axialanschlagelements combined. Thus, the total portable radial force can be increased and / or maintaining an axial position even with large temperature fluctuations and / or temperature differences between the inner wall and the Axialanschlagelement secured at least positively. No further measures are necessary for this.

For a printing cylinder of an injection-molded plastic, in particular a fiber-reinforced plastic, it is desired in terms of manufacturing technology to keep the wall thickness of the component as constant as possible. On the contrary, it is proposed on the contrary to keep the outer radius of the outer wall of the impression cylinder constant in the area of the radial press contact, with an (inner) kink from an insertion cone towards the area of the radial press contact directly adjacent to the axial position of the axial stop element (push-out side) is formed. In a conventional design with a wall thickness that is as constant as possible, the corresponding outer bend, that is the inner radius, moves axially into the area of the radial press contact on the outer wall. For an improved voltage curve, it is now proposed to keep the diameter of the outer wall in the region of the radial press contact constant.

According to a particularly preferred embodiment, the outer diameter of the outer wall is guided such that opposite to the adjacent regions of the printing cylinder, a thickening of the wall thickness in the region of the radial press contact is achieved. For example, the outer migration at the beginning of the tapered insertion cone on the inner wall or in a region before the end of axialanschlagelementseitigen end of the insertion cone in a parallel to the central axis (plane) outer diameter over. Preferably, the outer diameter, which is present before the beginning of the insertion cone, remains constant until beyond the region of the radial press-contact. As a result, additional material in the wall of the printing cylinder is present, in which the compressive stresses can be distributed. This leads to a reduction in the peak voltages, which could previously lead to a break on the inner wall.

According to an advantageous embodiment of the pressure line element, the axial stop element in the middle section at least one pressure studs and on the insertion side and the Ausschubseite each have a cone knobs, wherein the at least one pressure studs and the two cone studs are formed for a resulting same radial force corresponding to the shape of the circulation groove.

In this advantageous embodiment, at least one pressure nubs is provided at the middle section of the axial stop element on the inner wall side, that is, toward the inner wall of the pressure cylinder, for the press contact. The pressure nubs is formed as a circumferential ring or by a plurality of individual surveys. By means of pressure nip a defined pressure can be achieved, and also facilitates mounting and / or dismantling due to increased deformability, compared to a solid surface. Furthermore, now has the insertion side and the broke side each have a cone knobs, which are also set up for an introduction of a defined pressing pressure. Here, too, easier assembly and disassembly is achieved.

• - ein Druckleitungselement nach einer Ausführungsform gemäß der obigen Beschreibung;
• - ein axial bewegbares Drucksteuerelement, wobei das Axialanschlagelement des Druckleitungselements eine axiale Bewegung des Drucksteuerelements einseitig begrenzt; und
• - ein Gegenaxialanschlagelement, welches in dem Druckzylinder eine axiale Bewegung des Drucksteuerelements in der Gegenrichtung zu dem Axialanschlagelement einseitig begrenzt,

wobei das Drucksteuerelement mittels eines Druckmediumflusses in dem Druckleitungselement beidseitig axial bewegbar ist, und
wobei das Drucksteuerelement einen ersten Durchlass und einen zweiten Durchlass aufweist, wobei der erste Durchlass dauerhaft geöffnet ist und der zweite Durchlass einzig bei Anliegen des Drucksteuerelements an dem Axialanschlagelement und/oder an dem Gegenaxialanschlagelement verschlossen ist.According to a further aspect, the invention relates to a pressure limiter for a hydraulic or pneumatic system, comprising at least the following components:

• a pressure line element according to an embodiment according to the above description;
• an axially movable pressure control element, wherein the axial stop element of the pressure line element limits an axial movement of the pressure control element on one side; and
• a counter-axial stop element which, in the pressure cylinder, limits an axial movement of the pressure control element in the opposite direction to the axial stop element,

wherein the pressure control element by means of a pressure medium flow in the pressure line element is axially movable on both sides, and
wherein the pressure control element has a first passage and a second passage, wherein the first passage is permanently open and the second passage is closed only upon application of the pressure control element to the Axialanschlagelement and / or on the Gegenaxialanschlagelement.

The proposed here pressure limiter comprises a pressure line element, wherein the pressure cylinder of the pressure limiter is preferably formed integrally with the pressure cylinder of the pressure line element. Here, the printing cylinder comprises a Gegenaxialanschlagelement, which is preferably formed integrally with the printing cylinder. The Gegenaxialanschlagelement limits the travel of the pressure control element in the opposite direction, ie in the direction away from the Axialanschlagelement. The pressure control element forms an axially movable baffle plate in the pressure medium flow. The pressure control element has a first passage, for example centrally, and a second passage, for example a plurality of eccentrically arranged openings. In a first position, preferably adjacent to the counter-axial stop element, both the first passage and the second passage can be flowed through. In a second position adjacent to a stop, preferably on the axial stop element, one of the two passages, for example the second passage, is closed. Thus, then only one of the passages, according to the previous example, the first passage, flowed through. Thus, a maximum speed is limited by reducing the flow-through diameter.

Preferably, the pressure limiter works like a conventional pressure limiter. Apart from the properties of the pressure line element described above, for example the shape of the axial stop element and / or the shape of the inner wall of the pressure cylinder, the pressure limiter particularly preferably has conventional components.

• - eine Gebereinheit;
• - eine Nehmereinheit;
• - eine drucksteife kommunizierende Verbindung zwischen der Gebereinheit und der Nehmereinheit;
• - einen Druckbegrenzer nach einer Ausführungsform gemäß der obigen Beschreibung, wobei der Druckbegrenzer in der drucksteifen kommunizierenden Verbindung angeordnet ist,

wobei die Nehmereinheit mittels eines Druckmediums über die drucksteife kommunizierende Verbindung von der Gebereinheit betätigbar ist, wobei mittels des Druckbegrenzers eine Druckänderungsgeschwindigkeit in einer ersten Flussrichtung auf eine erste Maximalgeschwindigkeit und in einer zweiten Flussrichtung auf eine zweite Maximalgeschwindigkeit begrenzt ist, wobei die erste Maximalgeschwindigkeit geringer als die zweite Maximalgeschwindigkeit ist.According to a further aspect, the invention relates to a hydraulic or pneumatic system, comprising at least the following components:

• a transmitter unit;
• a recipient unit;
• a pressure-stiff communicating connection between the transmitter unit and the receiver unit;
• a pressure limiter according to an embodiment according to the above description, wherein the pressure limiter is arranged in the pressure-stiff communicating connection,

wherein the receiver unit is actuated by the pressure limiter via the pressure-stiff communicating connection from the transmitter unit, wherein by means of the pressure limiter a pressure change rate in a first flow direction is limited to a first maximum speed and in a second flow direction to a second maximum speed, wherein the first maximum speed is less than that second maximum speed.

The proposed hydraulic or pneumatic system has a transmitter unit, for example, a master cylinder filled with a pressure medium and a master piston. The master piston is set up such that the encoder volume enclosed by master cylinder and master piston and filled with the pressure medium can be varied in a path-dependent manner. Alternatively, the donor system is a pure pressure source, for example a pump and / or a valve system.

Furthermore, the system has a receiving unit, for example, a slave cylinder filled with a pressure medium and with a slave piston, wherein the slave piston is movable due to a change in the slave volume. The transmitter unit and the slave unit are communicatively connected to each other so that a decrease in volume or an increase in pressure in the transmitter unit leads to an increase in volume in the slave unit.

In the communicating connection between the transmitter unit and the slave unit, a pressure limiter according to the above description is arranged, whereby a pressure change speed can be limited. In this case, for example, for limiting a maximum speed with which the slave volume increases, can be limited to a first maximum speed by one, for example, the second, passage of the pressure control element, for example, by means of the Axialanschlagelements is closed and only the other, for example, the first, flow-through is. On the other hand, the pressure control element of the corresponding stop, according to the axial stop element, for example, is objected to in such a way that the second passage can also be flowed through to reduce the volume as rapidly as possible in the slave unit. So that is a second maximum speed achievable, which is greater than the first maximum speed.

With the pressure line element of the pressure limiter proposed here, an otherwise conventional hydraulic and dramatic system can be used, wherein the assembly and disassembly of the axial stop element is facilitated and the resistance to breakage is increased. At the same time the risk of axial release of the Axialanschlagelements is reduced or excluded from the interference fit.

According to a further aspect, the invention relates to a motor vehicle, comprising a drive unit with a drive shaft, at least one drive wheel, a torque transfer unit in the torque flow between the drive shaft and the at least one drive wheel and a hydraulic or pneumatic system according to an embodiment as described above, wherein the torque transfer unit is actuated by means of the hydraulic or pneumatic system and wherein due to an input at the Encoder unit torque transmission is changeable.

The drive unit with its drive shaft, the at least one drive wheel, the torque transfer unit in the torque flow between the drive shaft and the at least one drive wheel form a drive train whose torque transmission is interruptible by means of the hydraulic or pneumatic system. The drive train is set up to transfer a torque that is provided by the drive unit, for example an energy conversion machine, preferably an internal combustion engine or an electric drive machine, and output via its output shaft, for at least one consumer, ie switchable and switchable. One of these consumers is the at least one drive wheel of a motor vehicle and / or an electrical generator, for example an alternator or a starter generator, for providing electrical energy. Conversely, a recording of an inertial energy introduced, for example, by a drive wheel can also be implemented. The at least one drive wheel then forms the drive, wherein its inertia energy can be transmitted by means of the torque transmission unit to an electric generator for recuperation, that is, for the electrical storage of the braking energy, with a suitably configured drive train. Furthermore, in a preferred embodiment, a plurality of drive units are provided, which are connected by means of the torque transfer unit in series or in parallel or decoupled from each operable, or their torque is releasably available for use available. Examples are hybrid drives of electric drive machine and internal combustion engine, but also multi-cylinder engines, in which individual cylinders (groups) are switchable. The torque transmission unit is, for example, a friction clutch, preferably a dual clutch, in which case the slave unit comprises two slave pistons, preferably arranged as a central release, for example, on the transmission input shaft of a downstream double shift transmission.

To selectively transmit the torque and / or by means of a gearbox with different ratios or to separate a transmission, the use of the above-described hydraulic or pneumatic system is particularly advantageous. The hydraulic or pneumatic system comprises a pressure line element, which is extremely resistant, allows easy assembly and disassembly and is inexpensive to implement.

• 1: ein Druckbegrenzer mit Drucksteuerelement in erster Position;
• 2: ein Druckbegrenzer mit Drucksteuerelement in zweiter Position;
• 3: ein Druckleitungselement mit konventionellem Druckzylinder und konventionellem Axialanschlagelement;
• 4: ein Druckleitungselement mit Axialanschlagelement mit Drucknoppen im Druckzylinder;
• 5: ein Axialanschlagelement mit Einschubkonus in einem Druckzylinder im Detail;
• 6: ein Axialanschlagelement in einem Druckzylinder mit verdickter Wandung; und
• 7: ein Kraftfahrzeug mit hydraulischem oder pneumatischem System.

The above-described invention will be explained in detail in the background of the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is not limited by the purely schematic drawings in any way, it being noted that the drawings are not dimensionally accurate and are not suitable for the definition of size ratios. It is shown in

• 1 a pressure limiter with pressure control in the first position;
• 2 a pressure limiter with pressure control in second position;
• 3 a pressure line element with a conventional pressure cylinder and conventional axial stop element;
• 4 : a pressure line element with axial stop element with pressure nubs in the pressure cylinder;
• 5 an axial stop element with insertion cone in a printing cylinder in detail;
• 6 an axial stop element in a pressure cylinder with a thickened wall; and
• 7 : a motor vehicle with hydraulic or pneumatic system.

Ordinal numbers used in the preceding and following descriptions, unless explicitly stated to the contrary, are for the purpose of distinctness only and do not disclose the order or ranking of the designated components.

In 1 is a pressure limiter 2 with print control 6 shown in a first position, in which the pressure control element 6 at a Gegenaxialanschlagelement 28 is brought to the plant. The counter-axial stop element 28 is here in one piece with the printing cylinder 3 formed and includes a, here eccentric, outlet 26 over which a pressure medium can flow according to the arrow shown. In this first position are the centrally located first passage 30 and the second passage comprising a plurality of openings 31 permeable, so that a second maximum speed is reached. An axial stop element 7 is in the printing cylinder 3 in the area of here with the pressure limiter 2 integrally formed pressure line element 1 pressed. This is the Axialanschlagelement 7 from the side of the inlet 27 with the insertion side 11 ahead in mounting direction 13 , which the opposite direction 29 corresponds to the impression cylinder 3 along the central axis 4 insertable. In dismounting direction 14 is the axial stop element 7 with the extension side 12 pulled out again in front. In the shown position of the Axialanschlagelements 7 is a radial force 15 on the inner wall 5 of the printing cylinder 3 exercised, which (relevant) the Axialanschlagelement 7 secure in his position.

In 2 is the pressure limiter 2 according to 1 shown here, where the print control 6 due to its shape of a baffle and its axial mobility of the Gegenaxialanschlag 28 away along the central axis 4 placed in a second position, namely against the insertion side 11 of the axial stop element 7 pressed. Now the second passage 31 closed and only the second passage 30 permeable, so that only a smaller first maximum speed can be achieved due to the diameter constriction.

In 3 is a pressure line element 1 with conventional impression cylinder 43 and conventional axial stopper 44 shown between an inlet 27 and an outlet 26 along the central axis 4 is inserted. In the wall of the conventional printing cylinder 43 a voltage waveform is shown, wherein the voltage in the region of the conventional Axialanschlagelements 44 because of the required radial force 15 (see 1 ) is very high, for example at about 145 MPa [Mega Pascal] and in a worst case scenario up to about 185 MPa, with a required radial force of about 175 N [Newton].

In 4 is in an identical view too 3 a pressure line element 1 with a printing cylinder 3 with projections 9 . 10 (see 5 ) and an axial stop element 7 with insertion cone 20 (see 5 ). Here is the location of the detail D shown in which 5 is shown.

In 5 the detail is out 4 shown, wherein an axial stop element 7 with insertion cone 20 in a printing cylinder 3 is pressed. The radial press seat 8th extends over the middle section 48 of the axial stop element 7 , The middle section 48 here has two printing nubs 21 and 22 on, which are preferably designed as circumferential rings. In one embodiment alone, over these pressure nubs 21 and 22 the radial force 15 in the inner wall 5 of the printing cylinder 3 initiated. The insertion side 11 is the front of the insertion section 19 , which as insertion cone 19 is formed and also a first cone nubs 23 includes. This first cone knot 23 acts, for example, purely positive, with a second projection 10 such that the axial stop element 7 along the central axis 4 not further in mounting direction 13 in the printing cylinder 3 can slip. The extension side 12 is the front of the Ausschubabschnitts 45 , which as Ausschubkonus 46 is formed and also a second cone nubs 24 includes. This second cone nubs 24 acts, for example, purely form-fitting, with a first projection 9 such that the axial stop element 7 along the central axis 4 not in dismounting direction 14 in the printing cylinder 3 can slip. According to an advantageous embodiment, the first and second cone nubs 23 and 24 also in pressing contact with the inner wall 5 , more precisely the respective projection 10 respectively 9 , This is an area 18 formed in which there is a radial press contact. This distributes the required radial force 15 on a larger area. In this example, the inner wall is 5 in this area 18 formed as arcuate circumferential groove in the axial direction, that produces a concave increase in the inner diameter. As a result, a significant reduction of the radial pressure is already achieved and these measures are sufficient, so that an approximately parallel guidance of the outer wall 16 to the inner wall 5 , which here an insertion funnel 47 for easier insertion of the axial stop element 7 or to keep short the insertion path to reach the desired axial position. The outer diameter 17 is changed so that the wall thickness, so the radial distance between the inner wall 5 and the outer wall 16 , remains approximately constant. This is an external kink in the area 18 of the Radialpresssitzes and here even in the region of the press fit 8th in the outer wall 16 in front. Due to the larger force introduction surface between the projections 9 and 10 and / or the additional positive locking means of the projections 9 and 10 is the compressive stress in the wall of the printing cylinder 3 but sufficiently reduced for many applications, for example to below 100 MPa [Mega Pascal] in the same worst case scenario and for the same required radial force 15 as in the example above.

In 6 is a similar embodiment of the pressure line element 1 and in the same detail view as in 5 shown. Here are the first and second cone knobs 23 and 24 in pressure-transmitting contact with the respective projection 10 respectively 9 so over the entire range 18 via the nub contacts pressure in the wall of the printing cylinder 3 is initiated. Here, however, the outer wall 16 with an outer diameter 17 executed, which of a section in front of the insertion funnel 47 the inner wall 5 over the area 18 is kept constant, so that a thickening of the wall thickness is achieved and additionally no (external) kink in the area 18 is formed. As a result, the compressive stress in the material continues to decrease and is distributed more uniformly without disruption.

In 7 is a hydraulic or pneumatic system 25 in a motor vehicle 34 shown schematically. The car 34 includes in the direction of the longitudinal axis 41 in front of the driver's cab 40 a drive unit 35 with motor axle 42 and with a drive shaft 36 , which by means of a torque transmission unit 37 For example, a friction clutch with a friction pack, detachable with a left drive wheel 38 and a right drive wheel 39 torque transmitting connected. To release or connect the torque transmission is a clutch pedal 49 in the driver's cabin 40 actuated, on the signal out, for example by means of clutch-by-wire electronically, a transmitter unit 32 causes the slave volume in the subscriber unit 33 is increased or decreased accordingly. For example, for direction-dependent limiting the maximum speed of the pressure change or the pressure equalization between slave unit 33 and transmitter unit 32 is a pressure line element 1 according to an embodiment according to the above description interposed. By means of the receiving unit 33 According to the aforementioned example, the friction pack is compressed or permits a spacing, so that a torque can be transferred by friction in the compressed state by means of the friction pack or in the spaced state, no or only a negligible slip torque can be transmitted.

With the pressure line element proposed here, increased safety is achieved against a component failure, while at the same time only small and space-neutral adjustments to a conventional pressure line element must be performed.

LIST OF REFERENCE NUMBERS

1

Pressure pipe element

2

pressure limiter

3

pressure cylinder

4

central axis

5

inner wall

6

Print Control

7

Axialanschlagelement

8th

Radial interference fit

9

first advantage

10

second lead

11

insertion side

12

discharge side

13

mounting direction

14

Removal direction

15

radial force

16

outer wall

17

outer diameter

18

Area of radial press contact

19

insert portion

20

insertion cone

21

first printing nubs

22

second pressure nubs

23

first cone nubs

24

second cone nubs

25

hydraulic or pneumatic system

26

outlet

27

inlet

28

Gegenaxialanschlagelement

29

opposite direction

30

first passage

31

second passage

32

transmitter unit

33

receiver unit

34

motor vehicle

35

power unit

36

drive shaft

37

Torque transmission unit

38

left drive wheel

39

right drive wheel

40

cab

41

longitudinal axis

42

motor axis

43

conventional impression cylinder

44

conventional axial stop element

45

Ausschubabschnitt

46

Ausschubkonus

47

insertion funnel

48

mid section

49

clutch pedal

Claims (10)

Pressure line element (1) for a pressure limiter (2), comprising at least the following components: - a pressure cylinder (3) with a central axis (4) and with an inner wall (5); and an axial stop member (7) held in the pressure cylinder (3) in an axial position, the axial stop member (7) being for holding its axial position with the inner wall (5) of the impression cylinder (3) forms a radial press fit (8), characterized in that the inner wall (5) forms a radially inwardly directed projection (9, 10) at least on one side of the radial press fit (8), wherein the projection (9, 10) secures the axial position of the axial stop element (7). Pressure line element (1) after Claim 1 , wherein two projections (9,10) by means of a circumferential groove on both sides of the Axialanschlagelements (7) is formed, and wherein preferably the circumferential groove in the axial direction forms an arcuate shape. Pressure line element (1) for a pressure limiter (2), comprising at least the following components: - a pressure cylinder (3) with a central axis (4) and with an inner wall (5); and - an axial stop member (7) held in an axial position in the impression cylinder (3), the axial stop member (7) having a center portion (8) for maintaining its axial position with the inner wall (5) of the impression cylinder (3) wherein the central portion (8) forms a radial press fit (8), and wherein the Axialanschlagelement (7) has an insertion side (11) and a Ausschubseite (12), wherein the insertion side (11) in an axial mounting direction (13) and at the assembly is first inserted into the pressure cylinder (3) and the Ausschubseite (12) in an axial disassembly direction (14), characterized in that the insertion side (11) is conical and with the inner wall (5) is in radial press contact , Pressure line element (1) after Claim 3 , wherein the Ausschubseite (12) is conically formed and is in radial compression contact with the inner wall (5). Pressure line element (1) after Claim 3 or 4 , wherein the resulting radial force (15) of the press contact of the insertion side (11) and / or the press contact of the Ausschubseite (12) after Claim 4 is equal to or less than the radial force (15) of the central portion (8) on the inner wall (5). Pressure line element (1) after Claim 1 or 2 and one of the Claims 3 to 5 in which the pressure cylinder (3) has an outer wall (16) with an outer diameter (17) and the outer diameter (17) in the region (18) of the radial press contact is constant, the inner wall (5) preferably being adjacent to the radial press fit (8) an axial insertion portion (19) with a towards the Axialanschlagelement (7) tapered insertion cone (20), and the outer diameter (17) in this towards the Axialanschlagelement (7) wall thickness thickening, particularly preferably constant, is formed. Pressure line element (1) after Claim 2 and 4 , wherein the axial stop element (7) in the middle section (8) at least one pressure nubs (21,22) and on the insertion side (11) and the Ausschubseite (12) each have a cone nubs (22,24), wherein the at least one pressure nubs (21 , 22) and the two conical nubs (22,24) are formed for a resulting same radial force (15) corresponding to the shape of the circumferential groove. Pressure limiter (2) for a hydraulic or pneumatic system (25), comprising at least the following components: - A pressure line element (1) according to one of the preceding claims; - An axially movable pressure control element (6), wherein the Axialanschlagelement (7) of the pressure line element (1) limits an axial movement of the pressure control element (6) on one side; and - A Gegenaxialanschlagelement (28) which in the pressure cylinder (3) an axial movement of the pressure control element (6) in the opposite direction (29) to the Axialanschlagelement (7) unilaterally limited, wherein the pressure control element (6) by means of a pressure medium flow in the pressure line element ( 1) is axially movable on both sides, and wherein the pressure control element (6) has a first passage (30, 31) and a second passage (30, 31), wherein the first passage (30, 31) is permanently open and the second passage (30, 31) is solely in contact with the Pressure control element (6) on the Axialanschlagelement (7) and / or on the Gegenaxialanschlagelement (28) is closed. Hydraulic or pneumatic system (25), comprising at least the following components: - a transmitter unit (32); a receiving unit (33); - A pressure-stiff communicating connection between the transmitter unit (32) and the receiving unit (33); - a pressure limiter (2) after Claim 8 wherein the pressure limiter (2) is arranged in the pressure-stiff communicating connection, wherein the receiving unit (33) by means of a pressure medium via the pressure-stiff communicating connection of the transmitter unit (32) is actuated, wherein by means of the pressure limiter (2) a pressure change rate in a first Flow direction is limited to a first maximum speed and in a second flow direction to a second maximum speed, wherein the first maximum speed is less than the second maximum speed. Motor vehicle (34), comprising a drive unit (35) with a drive shaft (36), at least one drive wheel (38, 39), a torque transmission unit (37) in the torque flow between the drive shaft (36) and the at least one drive wheel (38, 39). and a hydraulic or pneumatic system (25) Claim 9 wherein the torque transmission unit (37) is operable by means of the hydraulic or pneumatic system (25) and wherein a torque transmission is variable as a result of an input to the transmitter unit (32).

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