Quick connector

Abstract

The invention relates to a modular quick connector (10) for connecting fluid lines, comprising a coupling element (30) which extends along a longitudinal axis (L) and has a receiving opening (31) for connecting a first connecting piece (20), wherein the connecting piece (20) can be axially inserted into the coupling element (30) in a first assembly movement (1), wherein the coupling element (30) and the connecting piece (20) have a locking device (5) which is formed in the circumferential direction (U) and which is formed by at least one latching hook (4) at an insertable end (28) of the connecting piece (20), at least one receiving tab (8) on the receiving opening (31) of the coupling element (30) and by rotary stops (34, 35) on the receiving opening (31) of the coupling element (30), wherein the connecting piece (20) can be rotated in the circumferential direction (U) by a second assembly movement (2) after axial insertion, until it reaches a locking position, in which the elements of the locking device (5) interact in such a way that a return rotation of the connecting piece (20) and an axial release of the connecting piece (20) from the coupling element (30) are blocked. According to the invention, the latching hook (4) has a reinforced base (23) for introducing into the receiving tab (8) and a relatively flexible head part (24) having a latching hook tip (27) for latching on the rotary stop (35), wherein the flexible head part (24) of the latching hook (4) is thinner than the reinforced base (23) in order to provide more flexibility.

Description

[0001] quick connectors

[0002] The invention relates to a modular quick connector according to the preamble of claim 1.

[0003] Quick connectors, also known as QCs, are specialized fittings widely used in industries such as automotive. Their primary purpose is to quickly and securely connect fluid lines (such as fuel, oil, coolant, or air lines). These quick connectors can be used, for example, to create redirections of fluid flow within fluid lines or to link different systems together.

[0004] The modular design or two-part construction of these quick connectors allows them to be used in various vehicle types and applications, whether in engine technology, cooling systems, or other areas where a reliable and quick connection of fluid lines is required. The quick connector features a connecting piece (for example, a 90° plug) that can be inserted axially into a separate coupling element and locked or snapped into place by a rotational movement. For this purpose, the quick connector typically incorporates a locking mechanism with locking elements on the connecting piece and complementary locking receptacles on the coupling element.

[0005] In contrast, one-piece versions of such quick connectors also exist, whereby the two-piece or modular design offers significant advantages over the one-piece design, such as the elimination of a welding process (cleaner assembly process with less labor), the reduction of lead time and costs for additional tools in manufacturing, the possibility of configuring and combining different materials and colors, the flexible geometry configuration based on existing components, the easy implementation of additional functions in existing sets, etc.

[0006] For example, WO 2023 / 072551 A1 describes quick-release fasteners in a two-part design, which often exhibit a rigid geometry and limited flexibility. At the same time, there is an increased risk of breakage of the relatively stiff locking hook elements or locking hook tips during assembly of the connector to the coupling element. The disadvantage is, for example, that such pre-damage or an increased risk of pre-damage can lead, in particular, to a reduction in the locking torque. During assembly, when the connector is rotated circumferentially, the relatively flexible locking hook tip is slightly deformed radially inwards and subsequently engages in a locking position. Therefore, especially during the assembly process, breaks often occur in the area of ​​the locking hook element, which are attributable to radially inward bending of the locking hook or the flexible locking hook tip due to transverse stress.In practice, problems often arise regarding the mechanical strength of the locking hooks or locking elements, especially with regard to breakage of the locking hook tips due to the high stress during locking or during the assembly process.

[0007] These disadvantages and other challenges in the state of the art make it necessary to develop a more stable solution that allows for both simple and flexible assembly while ensuring a reliable fluid-tight connection.

[0008] The aim of the invention is to overcome these and other disadvantages of the prior art and to provide an improved quick connector that ensures a stable, simple and fluid-tight connection.

[0009] The main features of the invention are specified in the characterizing part of claim 1. Embodiments are the subject of further claims 2 to 16.

[0010] In a modular quick connector for connecting fluid lines, comprising a coupling element extending along a longitudinal axis and having a receiving opening for connecting a first connector, wherein the connector can be axially inserted into the coupling element in a first assembly movement, wherein the coupling element and the connector have a circumferentially designed locking device formed by at least one detent hook at an insertable end of the connector, at least one receiving tab at the receiving opening of the coupling element, and by rotation stops at the receiving opening of the coupling element, wherein, after axial insertion, the connector can be rotatably inserted circumferentially by a second assembly movement until it reaches a locking position in which the elements of the locking device interact in such a way thatTo prevent the connecting piece from being rotated backwards and from being axially detached from the coupling element, the invention provides that the locking hook has a reinforced base for insertion into the receiving tab and a relatively flexible head with a locking hook tip for engaging the rotation stop, wherein the flexible head of the locking hook is thinner than the reinforced base to offer greater flexibility.

[0011] According to a preferred embodiment, the flexible head section can have an arc shape directed radially outwards relative to the reinforced base, designed to counteract radial buckling in the direction of the longitudinal axis when the connector is rotated back. Preferably, the arc shape can provoke outward buckling when the connector is rotated back and a compressive load or torque is applied to the locking hook, wherein the coupling element can have a corresponding counter element to support the locking hook and prevent radial buckling outwards.

[0012] During the assembly process, the locking hook bends radially inwards in the direction of the connector axis or longitudinal axis when the hook slides over a corresponding coupling element shoulder in the second assembly step. The locking hook can preferably be designed with a thinner, arc-shaped form to offer greater flexibility and prevent breakage during the assembly process.

[0013] The aforementioned pull-out force refers to the force required to axially extract the first connecting piece from the annular coupling element after the two components have been locked together in the locking position by axial insertion and circumferential rotation. This force is primarily influenced by the interaction of the detent elements and receptacles, as well as the stops of the locking mechanism. The higher the pull-out force, the more stable and secure the connection, as this reduces the likelihood of unintentional axial separation of the components.

[0014] The locking torque refers to the torque that must be applied after assembly to secure the connection between the connector and the

[0015] To release the quick-connect coupling element, after the locking elements of the connector engage with the receiving elements of the coupling element by rotating the connector circumferentially, and the quick-connect is in a locked position, the so-called locking torque ensures that the connection remains stable and does not unintentionally release in a circumferential direction opposite to the intended locking direction. A high locking torque therefore means that considerable resistance must be overcome to rotate the components back from the locked position and separate them by "breaking" the locking mechanism.

[0016] A connector is generally a part that serves to establish a connection between two or more components that conduct a fluid flow. In the context of the invention, it can consist of a first and a second connector which together form the fluid path.

[0017] The coupling element can be understood as the part of the quick connector into which the first connecting piece is axially inserted and locked by rotating it circumferentially. It ensures that the first connecting piece engages securely.

[0018] The locking device provides a mechanism that firmly fixes the first connecting piece to the coupling element in the locking position after the second assembly movement has been carried out.

[0019] The reinforced base of the locking hook, together with the receiving tab of the coupling element, advantageously ensures a sufficiently high pull-off force and increased stability. The reinforced base preferably forms a positive fit with the receiving tab, thus preventing the two components from separating axially.

[0020] The flexible head allows the locking hook to adapt to the rotational stop of the coupling element when engaging. This facilitates the insertion and engagement of the connector into the coupling element and ensures reliable locking. Due to its increased flexibility, damage to the locking hook is prevented, particularly during the second step of assembly.

[0021] Breakage or damage during assembly is advantageously prevented by the described increase in hook flexibility. Preferably, this increased flexibility can be achieved by using a longer and thinner hook in the circumferential direction. However, such a hook tends to buckle significantly under compressive stress, i.e., when the connector is rotated backwards and the locking torque is applied to the hook. The preferably provided curvature or arc shape of the locking hook further encourages outward buckling. The main advantage is that the hook can be guided and supported on the outside by a suitable counter element on the coupling element, thus preventing buckling or breakage.

[0022] The engagement of the locking hook tip with the rotary stop ensures that the connector is held securely and immovably in the locked position after rotation. This prevents the connector from unintentionally rotating back or becoming axially loose. The rotary stop serves as a precise mechanism to guarantee the correct locking position. Once the locking hook tip is engaged, the connector remains securely fixed, ensuring high connection stability.

[0023] These features together ensure a secure and stable locking of the connector in the coupling element, eliminating the risk of the locking hook breaking or the connector unintentionally detaching. This improves the reliability and durability of the quick connector, especially under demanding conditions where high forces and torques may occur.

[0024] Overall, the invention aims to ensure a sufficiently high pull-out force to guarantee the mechanical integrity of the connection even under high loads. The increased locking torque improves the safety of the connection and prevents the parts from unintentionally coming apart, which is particularly important and advantageous in safety-critical applications.

[0025] According to a preferred embodiment, the reinforced base of the locking hook can engage positively and / or non-positively in the corresponding receiving tab by the relative rotation of the connector to the coupling element during the second assembly movement, such that axial loosening is prevented after the locking position has been reached. This function, created by the positive and / or non-positive connection after circumferential rotation, is particularly important in environments where the connector is subjected to strong vibrations, shocks, or other mechanical influences. This type of locking prevents axial loosening of the connector and ensures that the fluid connection remains firm and secure even under extreme operating conditions.This minimizes the risk of leaks or sudden connection failures, which is essential in safety-critical applications such as aerospace or medical technology systems. In aerospace engineering, for example, this connector could be used to secure fuel lines, as the positive-locking connection prevents accidental loosening even under the high vibrations and temperature fluctuations experienced during flight.

[0026] Preferably, the detent hook tip can have an end face with a chamfer that, upon reaching the locking position, abuts the rotary stop of the coupling element to block the connector from rotating backwards in the opposite circumferential direction, the rotary stop being able to have a corresponding chamfer. The chamfer on the detent hook facilitates the insertion of the connector into the locking position by reducing assembly forces and allowing smooth movement. This not only prevents damage to the connector during installation but also provides clear tactile feedback when the connection is securely locked. This is particularly useful for the installer, who can immediately see whether the connection is correctly and completely locked without the need for additional visual inspections.This feature minimizes the risk of assembly errors and contributes to greater reliability and safety during operation. In the assembly of medical devices, where time and precision are critical, the chamfer can advantageously ensure that connections are closed quickly and correctly, reducing downtime and the risk of leaks in sensitive applications.

[0027] Preferably, the coupling element can have an axial stop that limits the first assembly movement of the connector, while at least one rotary stop can limit the second assembly movement of the connector. Limiting the assembly movements with axial and rotary stops ensures that the connector is always positioned correctly, without the risk of overstressing or incorrect assembly. This reduces the likelihood of damage during installation and ensures that the connection always functions optimally. Particularly in industrial applications, where large quantities of connections need to be installed quickly and efficiently, this limitation contributes to a reduction in assembly errors and increases productivity.In the manufacture of industrial machines, where numerous connections need to be made in a short time, the axial and rotary stop helps to ensure that each connection is made correctly and without excessive stress.

[0028] According to a preferred embodiment, the connector can include at least one deflection section to allow a change in direction of a fluid passing through the quick connector, wherein the first connector can be a 90° plug, a T-piece, a Y-piece, a cross-piece, a variable-angle connector, or a multi-connector. The deflection section in the connector allows for flexible adaptation to different installation conditions. This is particularly advantageous in confined spaces or complex piping systems where a direct connection is difficult or impossible. The ability to mount the connector at different angles increases the flexibility and versatility of the system, enabling its use in various industries, from the automotive industry to building installations.Furthermore, the modular design facilitates maintenance and component replacement, thus reducing overall operating costs. In heating and air conditioning systems, for example, these connectors can be used to efficiently route pipes in confined spaces without requiring extensive modifications or special tools.

[0029] Preferably, the at least one locking hook of the locking device can be designed as a single-hook or multi-hook construction, with the multi-hook design featuring a spacer between the reinforced base and the flexible head of the at least one locking hook. The option of designing the locking hook in a single- or multi-part configuration allows its flexibility to be precisely adapted to the requirements of the specific application. A multi-part construction enables the load to be distributed evenly and increases the structural integrity of the connector.

[0030] In a preferred embodiment, the coupling element can be essentially ring-shaped, with the coupling element forming a through-opening opposite the receiving opening for receiving a second connecting piece. The ring-shaped design of the coupling element enables a uniform distribution of forces across the receiving opening and provides the possibility of accommodating a second connecting piece. This design significantly increases the flexibility and modularity of the system, as it allows for multiple connections that can be assembled securely and efficiently. This feature is particularly advantageous in applications where multiple fluid paths must be routed in a confined space, such as in complex machinery or robotics.Especially in robotics, where several hydraulic lines need to be connected within a compact unit, the ring-shaped coupling element enables efficient use of space and thus reduces the number of components required.

[0031] Preferably, the flexible head of the locking hook can be elastically deformed such that, during the second assembly movement and circumferential rotation, it is pressed radially inwards until the first connecting piece engages in the locking position and the head automatically returns radially outwards to its original position upon engagement. Preferably, the flexible head of the locking hook can be wedge-shaped. According to another preferred embodiment, the flexible head of the locking hook can be curved. Other designs for the flexible head are also conceivable to achieve the desired effect. Ideally, the flexible head of the locking hook provides a spring-loaded connection that facilitates engagement and simultaneously increases the security of the locking mechanism.The radial inward pressing during assembly and the subsequent snapping back into the starting position ensure that the connection is held securely even under dynamic loads.

[0032] Preferably, the arc shape of the head can be formed by a chamfered surface, which, after assembly, provides a planar guide against an inner guide surface of the coupling element's receiving opening, wherein the receiving tab can have a rounded inner contour. The rounded (chamfered) tip or surface of the locking hook prevents sharp-edged contact between the hook and the shoulder during a locking torque test, thus preventing premature failure of the shoulder during the test. The rounded (chamfered) tip of the locking hook ensures contact with the coupling element's shoulder over a larger contact area. The rounded inner contour of the receiving tab reduces stress concentration in this area during a pull-off force test.This advantageously leads to an increase in the pull-out force. This design contributes to a longer service life of the connector and ensures that the connection remains stable even under difficult assembly conditions.

[0033] In a preferred embodiment, the coupling element can be made of an elastic material that allows limited deformation of the receiving tab when the locking hook is inserted and locked. The locking hook can be made of a high-strength polymer or metal alloy to ensure increased tensile strength. The use of an elastic material for the coupling element, combined with a high-strength locking hook, allows controlled deformation of the connector, ensuring locking without material fatigue or breakage. This material combination increases the connector's resistance to extreme temperatures, pressure spikes, and mechanical stresses. This ensures the safety and longevity of the system in demanding environments, such as in the petrochemical industry or offshore applications, where pipelines are exposed to extreme environmental conditions.In offshore drilling platforms, where pipes are exposed to high pressures and extreme temperatures, the combination of materials ensures a durable and secure connection that can withstand the harsh conditions.

[0034] According to a preferred embodiment, the reinforced base of the locking hook can have a T- or L-shaped cross-sectional geometry, wherein the reinforced base of the locking hook of the first connector can have walls with curved side profiles that ensure a uniform distribution of forces on the surrounding receiving lug during locking. The specific geometry of the reinforced base of the locking hook, such as T- or L-shaped, enables optimal force distribution during locking. This prevents excessive stress on individual components and ensures that the connection remains stable even under high loads. The curved side profiles of the walls contribute to the uniform distribution of forces on the surrounding receiving lug, which increases the structural integrity of the entire connector.This design reduces the risk of material failure and increases reliability in applications requiring high mechanical strength, such as in the construction industry. At the same time, these shapes are suitable for implementing the desired stops. In heavy construction equipment, for example, where hydraulic connections must withstand high loads, the reinforced base of the locking hook ensures that the connections do not fail even under extreme stress.

[0035] Preferably, the locking device can be designed to produce an audible click and / or haptic feedback when the first connector is connected to the coupling element and locked into position after the second assembly movement. The audible click or haptic feedback upon the connector engaging provides the user with immediate confirmation that the connection has been made correctly and securely. This significantly improves usability, as the installer can immediately see whether the connection is properly locked, thus reducing the risk of assembly errors. This feature is particularly beneficial in safety-critical applications where incorrect assembly could have serious consequences. Furthermore, the haptic feedback can help increase installation speed and improve efficiency in the assembly process.In medical technology, where the correct assembly of fluid connections is vital, the audible click provides immediate feedback and can increase the safety of the devices.

[0036] Preferably, the receiving lugs of the coupling element can be formed by radial and axial reinforcing profiles, wherein the reinforcing profiles are formed on an outer annular surface of the receiving opening of the coupling element. The radial and axial reinforcement of the receiving lugs by reinforcing profiles increases the structural strength of the coupling element and ensures a stable and reliable connection, even under high axial and radial loads. Reinforcing profiles on the coupling element particularly increase the pull-off force. Furthermore, with such profiles, the point of failure during a pull-off test is advantageously shifted from the point of reinforcement (as is the case, for example, in prior art designs) to the "locking lever point," as is the case with the one-piece QC design with a single block.This means that the predetermined breaking point for this two-part QC is the same as for the one-part QC.

[0037] Preferably, the reinforcing profiles on the receiving lugs can be designed as radial protrusions on the outer annular surface of the receiving opening of the coupling element, further increasing the stability of the receiving lugs. Under axial pull-off force, a positive locking mechanism preferably holds the connector and the coupling element together. Corresponding walls of the coupling element between two reinforced receiving lugs can support the hook during a locking torque test and effectively prevent the hook from buckling. These additional structural reinforcements contribute to extending the service life of the connector and increasing its reliability in critical applications. Particularly in applications where the connector is subjected to high mechanical demands, such as in the automotive industry or mechanical engineering, these reinforcements ensure that the connections remain stable even with frequent use.In high-performance vehicles, where the connections are subjected to high dynamic loads, the radial protrusions ensure an increased service life and reliability of the connections.

[0038] In a preferred embodiment, the reinforcing profiles can be formed by stiffening ribs extending axially and radially on the outer annular surface to further increase the mechanical strength of the receiving lugs. These stiffening ribs on the reinforcing profiles of the coupling element can be designed to ensure a stable connection even after repeated use. Advantageously, the stiffening ribs reduce material consumption, thus effectively preventing material buildup in these reinforced areas. This is particularly important, for example, in industrial or military applications where the connections are exposed to extreme environmental conditions and high reliability is required.For example, in military equipment, where connections must withstand extreme stresses and environmental conditions, the stiffening ribs ensure that the connections remain stable and reliable.

[0039] Preferably, the coupling element can have an enlarged inner radius in the area of ​​its annular surface, wherein the enlarged inner radius can be larger than an inner radius of the receiving opening of the coupling element in order to form a receiving tab for the hook base, so that the form locking between coupled and coupling elements of the QC is produced.

[0040] In a preferred embodiment, the circumferential extent of the flexible head section can correspond approximately to the circumferential extent of the reinforced base, in particular to approximately two-thirds of the extent of the reinforced base, wherein the at least one receiving tab can project radially inwards towards the longitudinal axis. This embodiment describes a specific dimensioning of the flexible head section relative to the reinforced base. This proportional design achieves the optimal balance between flexibility and structural stability. The circumferential extent of the flexible head section, which corresponds to approximately two-thirds of the extent of the reinforced base, offers several advantages: The proportional design ensures that the forces acting when connecting or disconnecting the quick connector are distributed evenly across the entire structure.This minimizes stress on individual components and prevents material fatigue or failure. While the flexible head provides the necessary elasticity to ensure easy and secure locking, the reinforced base offers the required stability to maintain the connection even under high mechanical loads. The locking hook can preferably be designed longer and extended circumferentially to increase its flexibility and thus prevent damage during the second step of the assembly process. However, there is no strict rule regarding its length. What is important is that the hook is flexible enough so that it does not break during assembly. At the same time, it must be strong enough. This is particularly important in applications where both flexibility and stability are required, such as in hydraulic systems subjected to vibrations, dynamic forces, and oscillations.The specific design also allows for a reduction in the connector's size without compromising its mechanical performance. This is particularly advantageous in confined installation situations or when miniaturizing systems where space saving is crucial. The robust construction of the reinforced base, combined with the flexibility of the head, further contributes to a longer connector lifespan by reducing the risk of material wear and fatigue. The targeted relocation of stress points prevents premature wear, which is especially beneficial in industrial applications where high reliability and low maintenance costs are essential. The radially inward-projecting design of the receiving tab ensures precise guidance and positioning of the connector within the assembly fixture.This ensures an overall safe and repeatable installation, minimizing assembly errors and significantly increasing process reliability.

[0041] In an alternative or additional design variant, the first connector can also be a straight plug that does not cause any change in direction but rather directs the fluid in the same direction. Using a straight plug that directs the fluid in the same direction offers the advantage of simple and direct fluid routing without any losses due to deflection. This design variant is particularly suitable for applications where efficient, straight fluid transfer is desired, such as in systems with high flow rates or limited space, where a change in direction would be impractical. Eliminating deflections also reduces pressure loss and minimizes the risk of turbulence, thus increasing the overall efficiency of the system.

[0042] Preferably, the locking devices, or the locking mechanism itself, can withstand pull-out forces of up to 1800 N acting against the first assembly movement 1, when a nominal diameter of approximately X is selected. Further preferably, the locking device can withstand blocking torques of up to 18 Nm acting against the second assembly movement, when the same nominal diameter is selected.

[0043] Preferably, a sealing element can be arranged in the area of ​​the receiving opening of the coupling element and / or the insertable end of the first connecting piece. When a second connecting piece is inserted and / or when the second assembly movement is performed, this sealing element creates a fluid-tight connection between the connecting pieces and the coupling element by generating a defined contact pressure. The integration of a sealing element in the area of ​​the receiving opening or the insertable end of the connecting piece ensures a secure and reliable seal. This sealing element guarantees that no leaks occur, even under pressure, which is essential for applications in hydraulic systems or in the chemical industry where liquids or gases are transported under pressure. The defined contact pressure also ensures that the connection remains stable even under temperature fluctuations and vibrations.

[0044] Preferably, the connector and coupling element can be designed to allow tool-free assembly of the quick connector. Tool-free assembly simplifies handling and reduces the time and labor required for installation and maintenance. This is particularly advantageous in industrial applications where fast and straightforward assembly processes are crucial. Eliminating the need for special tools also minimizes the potential for errors and reduces operating costs. Preferably, the connector can have one or more guide elements that interact with corresponding guide elements on the coupling element during assembly to ensure correct alignment before locking.Guide elements on the connector and coupling element ensure precise alignment of the components before locking, simplifying assembly and increasing process reliability. This feature is particularly advantageous in automated manufacturing processes, where correct component alignment is crucial for the connection's functionality. The guide elements reduce the risk of misalignment and associated damage or malfunctions.

[0045] Preferably, the wedge-shaped head of the locking hook can have a smooth or coated surface to reduce sliding friction during engagement. A smooth or coated surface on the wedge-shaped head of the locking hook reduces sliding friction during engagement, which facilitates the assembly process and reduces the risk of material damage. This feature is particularly advantageous in applications requiring fast and smooth assembly, such as in mass production lines. Reduced friction also helps extend the service life of the connector and minimize maintenance requirements.

[0046] Preferably, a seal can be achieved by using an O-ring. According to an alternative preferred embodiment, the connecting piece and the coupling element can be made of materials with different moduli of elasticity to achieve optimized tension and sealing in the connection. The use of materials with different moduli of elasticity enables optimized tension and sealing in the connection. The material with the higher modulus of elasticity can provide structural stability, while the more flexible material allows for a better seal. This combination is particularly advantageous in applications where both high mechanical strength and a reliable seal are required, such as in pressure lines or sealing systems in the automotive industry.

[0047] Preferably, the outer surface of the coupling element can have textured areas that facilitate secure handling during assembly. A textured outer surface of the coupling element provides better grip and makes handling easier during assembly. This is particularly advantageous in environments where working with gloves or in wet or oily conditions is required. The textured surface reduces the risk of assembly errors and increases safety and efficiency in the assembly process.

[0048] According to a preferred embodiment of the invention, the locking device can comprise four locking hooks and four corresponding receiving tabs, wherein the locking hooks and the receiving tabs can each be arranged diametrically opposite each other and evenly distributed in the circumferential direction. This is particularly easy and cost-effective to implement in manufacturing and simultaneously improves the stability of the connection.

[0049] According to a further preferred embodiment of the invention, the rotary stop against which the end face of the locking hook comes to rest in the locking position can be designed and extend radially inwards in the direction of the longitudinal axis such that at least half of the end face is contacted by the rotary stop when it comes to rest against it. This leads to a significant increase in the locking torque.

[0050] According to a further preferred embodiment of the invention, the first connecting piece can have recesses in the area of ​​its locking hooks to save material and to stiffen the structure.

[0051] Further features, details and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. The drawings show:

[0052] Fig. 1a shows a schematic perspective view of an assembly process of a quick connector according to the invention;

[0053] Fig. 1b shows a schematic representation of the quick connector according to the invention in the assembled position with a coupling element;

[0054] Fig. 1c shows an enlarged detail view of a locking device of the quick connector according to the invention (assembled); Fig. 2 shows an enlarged detail view of a locking device of the quick connector according to the invention (disassembled);

[0055] Fig. 3 shows a schematic sectional view of the coupling element and an enlarged detail view of a reinforcement profile of the locking device of the quick connector according to the invention;

[0056] Fig. 4 shows an enlarged detail view of a further embodiment of the reinforcement profile of the locking device of the quick connector according to the invention;

[0057] Fig. 5a a schematic front view of the quick connector according to the invention;

[0058] Fig. 5b shows a schematic front view of the quick connector according to the invention in the assembled state;

[0059] Fig. 6 (Fig. 6a to Fig. 6e) schematic views of different embodiments of the locking device of the quick connector.

[0060] The modular or multi-part quick connector, generally designated 10 in Figs. 1a and 1b, is fundamentally used for connecting fluid lines and can be used in various applications. Fig. 1a illustrates an assembly process for locking the connector, whereas Fig. 1b shows the quick connector 10 in its assembled state.

[0061] The quick connector 10 comprises a coupling element 30 extending along a longitudinal axis L and having a receiving opening 31 for connecting a first connecting piece 20. As can be seen, the connecting piece 20 can be axially inserted into the coupling element 30 in a first assembly movement 1, wherein the coupling element 30 and the connecting piece 20 have a complementary locking device 5 extending in the circumferential direction U.

[0062] The locking device 5 is formed by at least one locking hook 4 at an insertable end 28 of the connecting piece 20, at least one receiving tab 8 at the receiving opening 31 of the coupling element 30, and by rotation stops 34, 35 at the receiving opening 31 of the coupling element 30. After axial insertion in the axial direction A, the connecting piece 20 is rotatable in the circumferential direction U by a second assembly movement 2 until it reaches a locking position in which the elements of the locking device 5 interact in such a way that a reversal of the connecting piece 20 and an axial release of the connecting piece 20 from the coupling element 30 are blocked.

[0063] As can be seen particularly by referring to and comparing Figs. 2, 5a and 5b, and 6a to 6e, the locking hook 4 has a reinforced base 23 for insertion into the receiving tab 8 and a relatively flexible head 24 with a locking hook tip 27 for engaging the rotary stop 35. The flexible head 24 of the locking hook 4 has an arc shape 26 that is directed radially outwards relative to the reinforced base 23 (see in particular Figs. 2 and 5a and 5b).

[0064] Fig. 1c shows in a first magnification X1 the locking device 5 and in particular the receiving tab 8. As can be seen, the receiving tabs 8 or the at least one receiving tab 8 of the coupling element 30 can be formed by radial and axial reinforcing profiles 3, 6, wherein the reinforcing profiles 3, 6 can be formed on an outer annular surface 33 of the receiving opening 31 of the coupling element 30.

[0065] The reinforcement profiles 3 can be formed on the receiving tabs 8 as radial protrusions on the outer annular surface 33 of the receiving opening 31 of the coupling element 30 and further increase the stiffness and pull-off force.

[0066] As can be seen particularly in Fig. 4, the reinforcing profiles 3 can be formed by stiffening ribs 37, which are formed on the outer annular surface 33 in the axial and radial directions A, R, in order to further increase the mechanical strength of the receiving lugs 8, wherein the stiffening ribs 37 on the reinforcing profiles 6 of the coupling element 30 can be designed such that they ensure a stable connection even after repeated use. For example, the stiffening ribs 37 can be formed by axial recesses on the reinforcing profile 3, 6.

[0067] The coupling element 30 can be essentially ring-shaped, wherein the coupling element 30 has one opposite the receiving opening 31.

[0068] The coupling element 30 can form a through-opening for receiving a second connecting piece. Figure 3 shows a sectional view, from which different inner radii of the coupling element 30 can be seen. The coupling element 30 can have an increased inner radius r in the area of ​​an inner guide surface 36, whereby the increased inner radius r can be larger than an inner radius r' of the receiving opening 31 of the coupling element 30. As can be seen, the increased inner radius r can also be larger than another inner radius r" on the opposite through-opening of the coupling element 30.

[0069] The reinforced base 23 of the locking hook 4 can engage in the corresponding receiving tab 8 by means of a form-fit and / or force-fit connection to the coupling element 30 during the second assembly movement 2, such that axial release in the axial direction A is prevented after reaching the locking position.

[0070] The locking hook tip 27 can have an end face 22 with a chamfer which, after reaching the locking position, rests against the rotary stop 35 of the coupling element 30 in order to block the connecting piece 20 from rotating backwards in a circumferential direction opposite to the circumferential direction U, wherein the rotary stop 35 can have a corresponding chamfer (see in particular Fig. 5b).

[0071] As can be seen from several figures, the coupling element 30 can have an axial stop 32 that limits the first axial assembly movement 1 of the connecting piece 20, wherein the at least one rotary stop 34 can limit the second assembly movement 2 (rotation in circumferential direction U) of the connecting piece 20.

[0072] The connecting piece 20 can comprise at least one deflection section 9 to enable a change of direction of a fluid passing through the quick connector 10, wherein the first connecting piece 20 can be a 90° plug, a T-piece, a Y-piece, a cross-piece, a variable-angle connector, or a multiple connector. In the embodiment shown in Fig. 1, the first connecting piece 20 is an angled piece, in particular a 90° plug. Alternatively or additionally, the first connecting piece 20 can also be a straight plug that does not cause a change of direction but directs the fluid in the same direction. The at least one locking hook 4 of the locking device 5 can be designed as a single-hook or multi-hook construction, wherein in the multi-hook construction a spacer 29 can be arranged between the reinforced base 23 and the flexible head 24 of the at least one locking hook 4 (see Fig. 1).in particular embodiment in Fig. 6c).

[0073] The flexible head part 24 of the locking hook 4 can be wedge-shaped, wherein the flexible head part 24 of the locking hook 4 can be elastically deformed in such a way that it is pressed radially inwards during the second assembly movement 2 and rotation in the circumferential direction U until the first connecting piece 20 engages in the locking position and the head part 24 moves radially outwards back to its initial position upon engagement (see Fig. 5a and Fig. 5b).

[0074] The arc shape 26 of the head part 24 can, for example, be formed by a chamfered surface which, when the connecting piece 20 is rotated in the circumferential direction U during the second assembly movement 2, enables a sliding guide on the inner guide surface 36 of the receiving opening 31 of the coupling element 30, wherein the receiving tab 8 can have a rounded inner contour designed to facilitate the insertion of the reinforced base 23 of the locking hook 4 and to reduce the stress on the material.

[0075] The coupling element 30 can have an elastic material which expediently allows a limited deformation of the receiving tab 8 when the locking hook 4 is inserted and locked, wherein the locking hook 4 can comprise a high-strength polymer or a metal alloy to ensure increased fracture toughness.

[0076] As can be seen in particular from the different embodiments of the locking hook 4 shown in Figures 6a to 6e, the reinforced base 23 of the locking hook 4 can have a T- or L-shaped cross-sectional geometry, wherein the reinforced base 23 of the locking hook 4 of the first connecting piece 20 can have walls with curved side profiles 25 which ensure an even distribution of forces on the surrounding receiving tab 8 when locking.

[0077] The extension of the flexible head section 24 in the circumferential direction U can correspond approximately to the extension of the reinforced base 23 in the circumferential direction U, in particular to approximately two-thirds of the extension of the reinforced base 23 in the circumferential direction U, wherein the at least one receiving tab 8 can project inwards in a radial direction R in the direction of the longitudinal axis L.

[0078] The locking device 5 can also be designed to produce an audible clicking sound and / or haptic feedback when the first connecting piece 20 is connected to the coupling element 30 after the second assembly movement 2 and brought into the locking position.

[0079] The locking devices 5 shown in Figures 1 to 6 can withstand opposing pull-out forces of up to 1800 N between connecting piece 20 and coupling element 30 during the first assembly movement 1, provided a nominal diameter of approximately X is selected. The locking device 5 for the second assembly movement 2 can withstand opposing blocking torques of up to 18 Nm between connecting piece 20 and coupling element 30, provided the same nominal diameter is selected.

[0080] A sealing element, preferably an O-ring (not shown), can be used to create a fluid-tight connection between the quick connector and a connecting nozzle.

[0081] The connecting piece 20 and the coupling element 30 can be designed to allow tool-free assembly and disassembly of the quick connector 10. An outer surface of the coupling element 30 can have structured areas that enable secure handling during assembly.

[0082] The locking hook 4 can have a convex curvature in the circumferential direction U to maximize the contact area when locking. The connecting piece 20 can have one or more guide elements which, during assembly, can interact with corresponding guide elements of the coupling element 30 to ensure correct alignment before locking.

[0083] The wedge-shaped head 24 of the locking hook 4 can have a smooth or coated surface to reduce sliding friction during engagement. The connecting piece 20 and the coupling element 30 can be made of materials with different moduli of elasticity to achieve optimized tension and sealing in the connection. The rotary stop 35, against which the end face 22 of the locking hook 4 abuts in the locking position, can be designed and extend radially inwards in the direction of the longitudinal axis L such that at least half of the end face 22 is contacted by the rotary stop 35 with its chamfered lead-in. This results in a significant increase in the locking torque.

[0084] The first connecting piece 20 can, in principle, have recesses in the area of ​​its locking hooks 4 to save material. At the same time, this creates a deflection area radially inwards for the locking hook 4, so that it can slide more easily over the rotary stop 35 during the second assembly movement 2 and has sufficient space for radial bending.

[0085] The invention is not limited to the embodiments described above, but can be modified in many different ways.

[0086] All features and advantages arising from the claims, the description and the drawing, including design details, spatial arrangements and process steps, can be essential to the invention both individually and in various combinations.

[0087] Reference numeral list

[0088] A Axial direction

[0089] R Radial direction

[0090] U circumferential direction

[0091] L Longitudinal axis r Enlarged inner radius of coupling element r' Inner radius (receiving opening) r“ Inner radius (opening opposite)

[0092] X1 first magnification (gain element schematic)

[0093] X2 second magnification (reinforcement element section)

[0094] 1. First assembly movement (axial insertion)

[0095] 2. Second assembly movement (rotation in circumferential direction)

[0096] 3. Enhancement profile (radial elevation)

[0097] 4 locking hooks

[0098] 5 Locking device

[0099] 6 Reinforcement profile (axial projection)

[0100] 7 connection pins (fluid line, Christmas tree structure)

[0101] 8 Mounting tab (for locking hook)

[0102] 9 Deflection section (90° connector)

[0103] 10 quick connectors (Quick Connector “QC”)

[0104] 20 first connecting piece

[0105] 21 Recess (material saving)

[0106] 22 End face (approach chamfer)

[0107] 23 reinforced base

[0108] 24 Headboard (wedge-shaped)

[0109] 25 curved side profile

[0110] 26 Arc shape (locking hooks radially outwards)

[0111] 27 Locking hook tip

[0112] 28 End (connecting piece, axial insertion)

[0113] 29 Spacing

[0114] 30 coupling element

[0115] 31 Receipt opening (coupling element)

[0116] 32 Axial stop (for initial assembly movement)

[0117] 33 Outer ring surface (receiving opening) Rotation stop (for reinforced base) Rotation stop (with chamfer, for head) Inner guide surface for locking hook (receiving opening for coupling element) Reinforcing ribs

Claims

Patent claims 1. Modular quick connector (10) for connecting fluid lines, comprising a coupling element (30) extending along a longitudinal axis (L) and having a receiving opening (31) for connecting a first connecting piece (20), wherein the connecting piece (20) can be inserted axially into the coupling element (30) in a first assembly movement (1), wherein the coupling element (30) and the connecting piece (20) have a circumferentially (U) designed locking device (5) formed by at least one locking hook (4) at an insertable end (28) of the connecting piece (20), at least one receiving tab (8) on the receiving opening (31) of the coupling element (30) and by rotation stops (34, 35) on the receiving opening (31) of the coupling element (30), wherein the connecting piece (20) can be rotated circumferentially (U) after axial insertion by a second assembly movement (2) until it Locking position reached,in which the elements of the locking device (5) interact in such a way that a reversal of the connecting piece (20) and an axial release of the connecting piece (20) from the coupling element (30) are blocked, characterized in that the locking hook (4) has a reinforced base (23) for insertion into the receiving tab (8) and a relatively flexible head part (24) with a locking hook tip (27) for engaging on the rotation stop (35), wherein the flexible head part (24) of the locking hook (4) is thinner than the reinforced base (23) in order to offer greater flexibility.

2. Quick connector according to claim 1, characterized in that the flexible head part (24) has a radially outwardly directed arc shape (26) in relation to the reinforced base (23), which is designed to counteract radial buckling in the direction of the longitudinal axis (L) when the connector (20) is rotated back.

3. Quick connector according to claim 1 or 2, characterized in that the reinforced base of the locking hook (4) engages in the corresponding receiving tab (8) by means of the relative rotation of the connecting piece (20) to the coupling element (30) during the second assembly movement (2) in a form-fit and / or force-fit manner, such that axial release is prevented after reaching the locking position.

4. Quick connector according to one of the preceding claims, characterized in that the locking hook tip (27) has an end face (22) with a chamfer which, after reaching the locking position, bears against the rotary stop (35) of the coupling element (30) to block the connecting piece (20) from rotating backwards in the opposite circumferential direction, wherein the rotary stop (35) has a corresponding chamfer.

5. Quick connector according to one of the preceding claims, characterized in that the coupling element (30) has an axial stop (32) that limits the first assembly movement (1) of the connecting piece (20), wherein the at least one rotary stop (34) limits the second assembly movement (2) of the connecting piece (20).

6. Quick connector according to one of the preceding claims, characterized in that the connector (20) comprises at least one deflection section (9) to enable a change of direction of a fluid passed through the quick connector (10), wherein the first connector (20) is a 90° plug or a T-piece or a Y-piece or a cross-piece or a variable angle connector or a multiple connector.

7. Quick connector according to one of the preceding claims, characterized in that the at least one locking hook (4) of the locking device (5) is designed as a single-hook or multi-hook construction, wherein in the multi-hook construction a spacer (29) is arranged between the reinforced base (23) and the flexible head part (24) of the at least one locking hook (4).

8. Quick connector according to one of the preceding claims, characterized in that the coupling element (30) is essentially ring-shaped, wherein the coupling element (30) forms a through opening opposite the receiving opening (31) for receiving a further second connecting piece.

9. Quick connector according to one of the preceding claims, characterized in that the flexible head part (24) of the locking hook (4) is elastically deformed in such a way that it is pressed radially inwards during the second assembly movement (2) and rotation in the circumferential direction (U) until the first connecting piece (20) engages in the locking position and the head part (24) returns radially outwards to its initial position by itself when engaging.

10. Quick connector according to one of the preceding claims, characterized in that the arc shape (26) of the head part (24) is formed by a chamfered surface which enables planar guidance on an inner guide surface (36) of the receiving opening (31) of the coupling element (30) after assembly, wherein the receiving tab (8) has a rounded inner contour.

11. Quick connector according to one of the preceding claims, characterized in that the reinforced base (23) of the locking hook (4) has a T- or L-shaped cross-sectional geometry, wherein the reinforced base (23) of the locking hook (4) of the first connector (20) has walls with curved side profiles (25) which ensure a uniform distribution of forces on the surrounding receiving tab (8) when locking.

12. Quick connector according to one of the preceding claims, characterized in that the locking device (5) is designed to produce an audible click sound and / or haptic feedback when the first connecting piece (20) is fluid-tightly connected to the coupling element (30) after the second assembly movement (2) and brought into the locking position.

13. Quick connector according to one of the preceding claims, characterized in that the receiving tabs (8) of the coupling element (30) are formed by radial and axial reinforcing profiles (3, 6), wherein the reinforcing profiles (3, 6) are formed on an outer annular surface (33) of the receiving opening (31) of the coupling element (30).

14. Quick connector according to claim 13, characterized in that the reinforcing profiles (3) are formed by stiffening ribs (37) which are formed on the outer annular surface (33) in axial and radial directions (A, R) to further increase the mechanical strength of the receiving lugs (8), wherein the stiffening ribs (37) on the reinforcing profiles (6) of the coupling element (30) are designed in such a way that they ensure a stable connection even after repeated use.

15. Quick connector according to one of the preceding claims, characterized in that the coupling element (30) has an increased inner radius (r) in the area of ​​its annular surface (33), wherein the increased inner radius (r) is larger than an inner radius (r') of the receiving opening (31) of the coupling element (30).

16. Quick connector according to one of the preceding claims, characterized in that the extension of the flexible head part (24) in the circumferential direction (U) corresponds approximately to the extension of the reinforced base (23) in the circumferential direction (U), in particular to approximately two-thirds of the extension of the reinforced base (23) in the circumferential direction (U), wherein the at least one receiving tab (8) projects inwards in a radial direction (R) towards the longitudinal axis (L).

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