A coupling system for a bicycle or motorcycle frame

Abstract

TITLE: A coupling system for a bicycle or motorcycle frame. The invention relates to a coupling system (1) for a bicycle or motorcycle frame (2). The coupling system (1) comprises a steering fitting (10) having a head tube (12) and a clamp (14) mounted at the base of the head tube (12). The clamp is configured to, in a tightened state, hold a fork steerer tube (30) within the clamp (14) around its cylindrical contour; and in an open state, release the fork steerer tube (30) from the clamping forces of the clamp (14). Figure 3

Description

Title of the invention: A coupling system for a bicycle or motorcycle frame Technical field

[0001] The technical field relates to a coupling system for a bicycle or motorcycle frame. In particular, a coupling system for such a vehicle which allows the transformation of an ordinary bicycle into, for example, a cargo bike, a tandem, etc. Prior art

[0002] A bicycle frame and a modular bicycle are for example known from BE1029748. There is a need for a coupling system for such a bicycle frame or modular bicycle where an improvement in terms of simplicity, ease of use and robustness can be achieved. Summary

[0003] According to a first aspect, there is provided a coupling system for a bicycle or motorcycle frame, comprising: - A steering coupling, rotatably mounted on a portion of a steering frame about an axis of rotation of a handlebar when in use, the steering coupling comprising: • A frame head tube with a central longitudinal axis along the axis of rotation of the handlebar; and • A clamp mounted at the bottom of the frame head tube, configured to: • in a clamped state, holding a fork steerer tube by applying a clamping force around a cylindrical contour of the fork steerer tube; and • in an open state, no longer apply clamping force to the fork steerer tube.

[0004] Thanks to this attachment, a robust coupling is achieved, which can also be made in a simple manner and allows the fork steering tube to be introduced into the coupling in a simple and efficient manner.

[0005] According to one embodiment: - The central longitudinal axis of the frame head tube coincides with the axis of rotation of the handlebar; and - The central longitudinal axis of the fork steering tube coincides with the axis of rotation of the handlebar in the clamped state.

[0006] According to one embodiment, in the clamped state, the clamping force exerted by the clamp on the cylindrical contour of the fork steering tube contains at least one component perpendicular to the direction of the axis of rotation of the handlebar; and / or according to the direction of the axis of rotation of the handlebar.

[0007] According to one embodiment, the clamp is configured so that the cylindrical contour of the fork steering tube around the axis of rotation of the handlebar: - in the clamped state, is surrounded by the clamp over more than half of a perimeter of said contour, preferably over 80% to 100% of the perimeter; and - in the open state, is not surrounded by the clamp over half or more of the perimeter of said contour, preferably over 50% to 80% of the perimeter.

[0008] According to one embodiment, the steering coupling comprises at least one locking element configured to, when the fork steering tube is inserted into the clamp and aligned with the axis of rotation of the handlebar, in the open state: - Prevent movement of the fork steering tube in the direction of the axis of rotation of the handlebar; - Allow movement of the fork steerer tube in a direction perpendicular to the axis of rotation of the handlebar, and / or where the locking element is configured to have a self-positioning effect upon insertion and / or tightening of the fork steerer tube in the clamp.

[0009] According to one embodiment, the locking element is configured so as to have a self-positioning effect when inserting and / or tightening the fork steering tube in the clamp.

[0010] According to one embodiment, the locking element respectively comprises: - a boss mounted on an inner surface of the clamp which protrudes in the direction of the fork steering tube in the clamped state; and - a notch or an opening formed in the cylindrical contour of the fork steering tube and configured so that the boss of the clamp enters said notch or opening when the fork steering tube is inserted into the clamp and aligned with the axis of rotation of the handlebar.

[0011] According to one embodiment, the clamping collar comprises: - A fixed clamping part which is fixed to the frame head tube; and - A movable clamping part which is mounted in a movable manner relative to the fixed clamping part.

[0012] According to one embodiment: - the fixed clamping portion, in the clamped state, surrounds half or less of the perimeter of the cylindrical contour of the fork head tube, preferably from 50% to 20% of the perimeter; and - the movable clamping part, in the open state, does not clamp half or more of the perimeter of the cylindrical contour of the fork steering tube, preferably does not clamp 50% to 80% of the perimeter.

[0013] According to one embodiment, the movable clamping part is mounted on the fixed clamping part around a pivot axis parallel to the axis of rotation of the handlebar.

[0014] According to one embodiment, the clamp comprises a quick-clamping device mounted on the fixed clamping part so that: - in the clamped state, the quick-clamping device exerts a clamping force on the movable clamping part; and - in the open state, the quick-clamping device releases the rotation of the movable clamping part around the pivot axis.

[0015] According to one embodiment, the coupling system further comprises: - a bracket coupling mounted on a front module frame of a front module, and configured for releasably connecting a front module coupling portion to the frame at a bracket, and where a front steering tube is mounted on the front module frame of the front module.

[0016] According to one embodiment, the coupling by supports comprises: - a fixed clamping element rigidly fixed to the front module frame; - a movable clamping element pivotally mounted on the fixed clamping element; and - a tensioning element, preferably quick-clamping, configured for: • in a clamped state, hold the front module connection part between the fixed clamping member and the movable clamping member; and • in an open state, release the front module connection part by means of the movable clamping element to enable a tilting movement of the front module connection part relative to the fixed clamping element.

[0017] According to one embodiment, the front module connection portion, the fixed clamping element and / or the movable clamping element are configured to have a self-positioning effect upon insertion and / or clamping of the front module connection portion between the fixed clamping element and the movable clamping element.

[0018] According to a second aspect, there is provided a bicycle or motorcycle frame, comprising a coupling system according to the first aspect.

[0019] According to a third aspect, there is provided an assembly comprising a bicycle or motorcycle frame according to the second aspect and one or more of the following elements: - a fork with at least one sleeve for fixing a wheel axle, the fork steering tube being mounted on said fork; - a front module comprising a front module frame, the fork steering tube being mounted on said front module frame; - a front module comprising a front module frame, the fork steering tube being mounted on said front module frame rotatably about its central longitudinal axis; - a front module comprising a front module frame, a directional front fork being mounted on said front module frame; - a front module comprising a front module frame, the fork steering tube being mounted on said front module frame rotatably about its central longitudinal axis; and a directional front fork being mounted on said front module frame, wherein the directional front fork of the front module is connected to the fork steering tube by a steering rod. Brief description of the drawings

[0020] By way of example, some embodiments will be described using the following figures:

[0021] Figures 1 to 4 show an embodiment of a steering coupling of an embodiment of a coupling system in different states;

[0022] [Fig.5] shows a section along line VV in [Fig.l];

[0023] [Fig.6] shows a section along line VLVI in [Fig.3];

[0024] [Fig.7] shows a view along arrow VII in [Fig.4];

[0025] Figures 8 to 11 show one embodiment of a bracket coupling. of a coupling system in different states;

[0026] [Fig. 12] shows a bicycle comprising an assembly with an embodiment of a steering coupling according to Figures 1 to 7 and a bracket coupling according to Figures 8 to 11. Description of the embodiments

[0027] [Fig.l] shows one embodiment of a coupling system 1 for a bicycle or motorcycle frame 2, as shown in more detail in [Fig.7]. The bicycle or moped may have two, three, four or any other suitable number of wheels. It is also clear that alternative forms are possible where the bicycle or moped and / or its construction differ from the embodiments shown in this description. In the embodiment of [Fig.l], the coupling system 1 comprises a steering coupling 10. The steering coupling 10 is rotatably mounted on a portion of the steering frame 20 about the axis of rotation of the handlebar S when in use.

[0028] As can be seen, the steering coupling 10 comprises a steering tube 12 with a central longitudinal axis 12L along the axis of rotation of the handlebar S. It is clear that the steering tube 12 in this exemplary embodiment is made of an elongated cylindrical tube, for example a metal tube of a suitable metal such as steel, aluminum, etc. or any other suitable material. As shown in the embodiment of the steering coupling 10, the steering tube 12 is also equipped with a Clamp 14 mounted at the bottom of the steering tube 12. [Fig.l] shows the steering coupling 10 in a clamped state. This means a state in which a fork steering tube 30 mounted in the Clamp 14 is fixed around its cylindrical contour by the Clamp 14.As will be specified later, for example in Figures 3 and 4, the steering coupling 10 is also configured to, in the open state, no longer subject the fork steering tube 30 mounted in the clamp 14 to a clamping force from the clamp 14. According to the example shown, the fork steering tube 30 is also an elongated cylindrical tube, for example a metal tube of a suitable metal such as steel, aluminum, etc. or any other suitable material.

[0029] As seen in [Fig.l], it is clear that the central longitudinal axis 12L of the steering tube 12 coincides with the axis of rotation of the handlebar S. Furthermore, it is also clear that the central longitudinal axis 30L of the fork steering tube 30, in the clamped state, coincides with the axis of rotation of the handlebar S. In this clamped state, the fork steering tube 30 therefore rotates with the steering tube 12 about the axis of rotation of the handlebar S, for example under the effect of a steering movement of a handlebar mounted on the steering tube by a stem. Thus, in the coupled state, the rotational movement about the axis of rotation of the handlebar S of the handlebar can be transferred by the steering coupling 10 to the fork steering tube 30 to steer a wheel mounted between the branches of the fork 32 and change the direction of the bicycle.

[0030] It is clear that, in the clamped state, as shown in [Fig.l], the clamping force exerted by the Clamp 14 on the outer contour of the fork steering tube 30 contains at least one component transverse to the direction of the axis of rotation of the handlebar S. In other words, the clamping force of the Clamp contains at least one component directed towards the axis of rotation of the handlebar S. In other words, the clamping force directed towards the inside of the Clamp 14 ensures that the Clamp 14 is fixed on the outer surface of the steering tube 12.

[0031] As seen in [Fig.l], the clamp 14 is configured such that the circular contour around the handlebar rotation axis S of the fork steering tube 30, in the clamped state, is completely surrounded by the clamp 14. In other words, the fork steering tube 30, which is preferably made of a one-piece elongated tubular element, is preferably completely surrounded on its outer side by the clamp 14 as shown. However, it is clear that alternative versions are possible, where, in the clamped state, the fork steering tube 30 is surrounded by the clamp 14 over more than half of the circular contour, preferably from 80% to 100% of the circular contour.

[0032] As shown, for example, in [Fig. 3], the clamp 14 is configured such that the circular contour around the handlebar rotation axis S of the fork steering tube 30, in the open state, is no longer surrounded by the clamp 14 over slightly more than half of the circular contour. However, it is clear that alternative shapes are possible, where, in the open state, the fork steering tube 30 is not surrounded by the clamp 14 over half or more of the circular contour, preferably from 50% to 80% of the circular contour.

[0033] It is clear that, according to the example embodiment shown, the fork steering tube 30 has a circular circumference, and that the contact surfaces of the clamp 14 which connect to the fork steering tube 30 form, in the clamped state, an adaptation circle. A section along the line VV, in the clamped state, is illustrated for example in [Fig. 5]. It is however obvious that alternative variants are possible, where the elongated and tubular fork steering tube 30 can have any other suitable shape for the circumference, such as for example elliptical, square, hexagonal, or any other polygonal shape or circumference with suitable straight and curved elements.

[0034] According to the exemplary embodiment shown in Figures 1 to 6, the clamp 14 comprises a fixed portion 16 which is securely attached to the head tube 12. In addition, the clamp 14 comprises a movable clamping portion 18 which is movably mounted relative to the fixed portion 16. According to the exemplary embodiment 8. The fixed portion 16 surrounds, in the clamped state, half or less of the circular circumference of the fork head tube 30. As illustrated in [Fig. 5], it is clear that slightly less than half is surrounded, allowing good guidance of the fork head tube 30 when inserted into the open clamp 14 as shown in [Fig. 6]. In this way, the clamp 14 positions itself automatically. It is obvious that alternative variants are possible, where preferably 50% to 20% of the circular circumference of the fork head tube 30 is surrounded by the fixed part 16 in the clamped state..

[0035] As shown in the following, the example shown of the clamp 14 comprises a movable clamping part 18, which in the open state as shown in [Fig. 6], does not surround half or more of the circular circumference of the fork steering tube 30. This allows the fork steering tube 30 to be inserted into the clamp 14 in a simple and efficient manner. It is clear that here too alternative variants are possible where the movable clamping part 18, preferably 50% to 80% of the circular circumference of the fork steering tube 30, does not surround in the open state.

[0036] As seen in Figures 1 to 6, the movable clamping part 18 is hinged to the fixed part 16 about a hinge axis P parallel to the axis of rotation of the handlebar S. It is clear that alternative variants are possible where the movable clamping part 18 is movable and / or removable relative to the fixed part 16 to open the clamp 14 in the open state and to tighten the clamp 14 in the tightened state.

[0037] As seen in Figures 1 to 4, the example of the clamp 14 comprises a quick tensioner 17. The quick tensioner 17 is mounted on the fixed part 16 and can be removably connected to the movable clamping part 18. In the clamped state, as shown in [Fig.l], the quick tensioner 17 exerts a clamping force on the movable clamping part 18. In the open state, as shown in Figures 3 and 4, the quick tensioner 17 releases the movable clamping part 18 for rotation about the hinge axis P. It is clear that the quick tensioner 17 is an element known to professionals in the field of bicycles and motorcycles which can generate a clamping force transverse to the axis of rotation of the lever thanks to a lever with an eccentric element.However, it is clear that alternative variants are possible, where any other suitable clamping element can be used to selectively apply a clamping force in the clamped state of the clamping collar 14 and to open the clamping collar 14 in the open state where the clamping force is no longer present.

[0038] The opening of the example of the clamp 14 shown in Figures 1 to 6 is as follows. As shown in [Fig. 2], the clamping force present in the clamped state in [Fig. 1] is first removed by the opening of the quick tensioner 17. The opening of the quick tensioner 17 then also allows the movable clamping part 18 to be inclined outwardly as shown in [Fig. 3].

[0039] Then, the fork steering tube 30, as shown in [Fig. 4], can be removed from the clamp 14 through the opening that is formed in the side wall of the clamp 14 by the opening of the movable clamping part 18. The open state of the clamp 14 allows this in a direction of movement with a component perpendicular to the axis of rotation of the handlebar S, as indicated by the arrow in [Fig. 4].

[0040] According to a preferred optional variant, the head steering coupling 10 comprises a locking element 40 configured to, when the fork steering tube 30 is inserted into the clamp 14 and aligned with the axis of rotation of the handlebar S, in the open state, or in other words, the position as shown in [Fig. 3], block the movement of the fork steering tube 30 in the direction of the direction of rotation of the handlebar S. In other words, according to the exemplary embodiment shown, an upward and / or downward movement of the fork steering tube 30 is prevented as long as the longitudinal central axis 30L of the fork steering tube 30 is aligned with the axis of rotation of the handlebar S. As shown in [Fig. 7], which represents a view according to arrow 7 in [Fig.3], such a locking element 40 may for example comprise a boss 42 which is fixed on the inner surface of the clamp 14 and which extends towards the fork steering tube 30 in the clamped state. In other words, an inwardly facing boss 42 on the inner surface of the clamp 14. Such an embodiment of the locking element 40 also comprises a notch or opening 44 on the outer contour of the fork steering tube 30. This notch or opening 44 is formed in such a way that the boss 42 of the clamp 14 enters this notch when the fork steering tube 30 is inserted into the clamp 14 and aligned with the axis of rotation of the handlebar S. According to the example shown, the locking element 40 is configured in such a way as to have a self-positioning effect when inserting and / or clamping the fork steering tube 30 in the clamp 14.According to the exemplary embodiment shown, this is achieved by a conically shaped boss 42 which cooperates with the opening 44 upon insertion to position the fork steerer tube 30 in the desired position and orientation when the longitudinal central axis of the fork steerer tube 30 aligns with the axis of rotation of the handlebar S upon insertion and clamping of the fork steerer tube 30 in the clamp 14, with ultimately the opening 44 of the fork steerer tube 30 resting against the base of the conically shaped protrusion 42. However, it is clear that alternative embodiments are possible where such a locking element 40 with a self-positioning effect is used. It is also clear that alternative embodiments are possible where the clamp 14 comprises two or more similar locking elements 40.

[0041] This locking element is advantageous because it supports the clamping collar 14 in the clamped state by preventing any movement along the central axis 14L. In such a configuration, the clamping collar 14 must only or mainly support transverse forces or rotational forces about the axis of rotation of the direction S.

[0042] Furthermore, such a locking element 40 allows movement of the steering tube 30 in a direction perpendicular to the axis of rotation of the steering S, and helps to maintain the correct position and orientation of the steering tube 30 each time. when inserted into the clamp 14. For example, this ensures that the front wheel remains properly aligned with the handlebars of the bicycle or moped. In other words, the locking element 40 has a self-positioning function. It is, however, obvious that variant embodiments are possible where such a locking element 40 with a self-positioning function is installed. It is also clear that configurations are possible in which the clamp 14 contains two or more of these locking elements 40.

[0043] It is clear that other variants of execution of the clamp 14 are possible. For example, it is possible to have two or more movable clamping parts 18 at different positions along the longitudinal central axis 14L, which can for example each cooperate separately with a fixed part 16 by means of a quick tensioner 17 to clamp the fork steering tube 3 in a releasable manner as described above.

[0044] According to another exemplary embodiment shown in Figures 8 to 11, the coupling system 10 also comprises a bracket coupling 50 for connecting a front module 3 to the bicycle frame 2 at the bracket 6. An example of such a front module 3 is shown in [Fig. 12]. The front module 3 comprises a front module frame 4 to which the bracket coupling 50 and a steered front fork 5 are attached. However, it is clear that alternative embodiments of the front module 3 are possible, such as a front module 3 for a cargo bicycle, a tandem, etc., where the front module 3 is connected to a bicycle frame 2 by means of the bracket coupling 50 and the steering coupling 10 as shown in [Fig. 12]. It is also clear that a bicycle frame can be equipped with a fork for a front wheel as shown in [Fig.l].In this way, a modular bicycle frame can be manufactured, which can be combined as required with a fork for a front wheel and / or a front module for e.g. a cargo bike, tandem, etc., or any other suitable bicycle or motorcycle configuration.

[0045] According to the exemplary embodiment shown in Figures 8 to 11, the bracket coupling 50 comprises a fixed part 52 fixed to the front module frame 4. Furthermore, the bracket coupling comprises a movable clamping part 54 mounted on the fixed part 52 by pivoting. In addition, a clamping element 56 is provided, preferably a quick-release tensioner similar to the quick-release tensioner 17. In the clamped state, as seen in [Fig. 8], the clamping element 56 is configured to clamp the front module part 60 between the fixed part 52 and the movable clamping part 54. In the open state, as shown in Figures 9 and 10, the clamping element 56 is configured to release the front module part 60 through the movable clamping part 54 with a tilting movement relative to the fixed part 52. Then, as shown in [Fig. 11], the front module part 60 can be tilted out of the fixed part 52.

[0046] According to the exemplary embodiment shown in Figures 8 to 11, the front module coupling part 60, the fixed part 50 and / or the movable clamping part 54 are configured so as to have a self-positioning effect upon insertion and / or clamping of the front module coupling part 60 between the fixed part 50 and the movable clamping part 54. This is achieved according to this exemplary embodiment by the hook shape of the fixed part 50 with an upwardly oriented V-shape, in which a transverse pin of the front module part 60 can be tilted from above, for example from a position shown in [Fig.l 1], to reach a clearly defined position as illustrated in [Fig. 10].It is clear that the farthest end of the upwardly oriented hook shape is dimensioned such that it fits between two side plates of the front module part 60 during this coupling movement, also reaching the desired position in a transverse direction as shown in [Fig. 10]. Then, a second, higher positioned transverse pin or axis of the front module part 60 can swing against the base of the hook shape as shown in [Fig. 10], after which the movable clamping part 54 with its downwardly oriented hooks can be tilted around this pin as shown in [Fig.9], thus ensuring the position in the vertical and transverse directions. Finally, the clamping is carried out by the quick tensioner 56 as shown in [Fig. 10].

[0047] It is therefore clear that the connection and decoupling of the steering coupling 10 and / or the coupling by supports 50 of the coupling system 1 can be carried out in a simple, efficient and reliable manner.

[0048] A bicycle or motorcycle with a frame equipped with such a coupling system 1 can therefore be easily connected to different modular elements. Such an assembly comprises, for example, a frame 2 of a bicycle or motorcycle with one or more of the above-described embodiments of the coupling system 1 and furthermore one or more of the following elements: - a fork with at least one arm for securing a wheel axle, to which the fork steering tube 30 is secured, as shown in [Fig.l]; - a front module 3 comprising a front module frame 4 to which the fork steering tube 30 is fixed; - a front module 3 comprising a front module frame 4 to which the fork steering tube 30 is rotatably mounted about its longitudinal central axis 30L; - a front module 3 comprising a front module frame 4 to which a steered front fork 5 is attached; a front module 3 comprising a front module frame 4 to which: • the fork steering tube 30 is rotatably mounted about its longitudinal central axis 30L; and • a steered front fork 5 is attached, the steered front fork 5 of the front module 3 being connected to the fork steering tube 30 by a steering rod, as shown in Figure 12.

Claims

Claims

1. A coupling system (1) for a bicycle or motorcycle frame (2), comprising: - a steering coupling (10), rotatably mounted on a portion of a steering frame (20) about an axis of rotation of a handlebar (S) when in use, the steering coupling (10) comprising: • a frame steering tube (12) with a central longitudinal axis (12L) along the axis of rotation of the handlebar (S); and • a clamp (14) mounted at a bottom of the frame steering tube (12), configured to: • in a clamped state, hold a fork steering tube (30) by applying a clamping force around a cylindrical contour of the fork steering tube (30); and • in an open state, no longer apply a clamping force to the fork steering tube (30).

2. Coupling system according to claim 1, wherein: - the central longitudinal axis (12L) of the frame steering tube (12) coincides with the axis of rotation of the handlebar (S); and - the central longitudinal axis (30L) of the fork steering tube (30) coincides with the axis of rotation of the handlebar (S) in the clamped state.

3. A coupling system according to one of claims 1 or 2, wherein, in the clamped state, the clamping force exerted by the clamp (14) on the cylindrical contour of the fork steering tube (30) contains at least one component perpendicular to the direction of the axis of rotation of the handlebar (S); and / or along the direction of the axis of rotation of the handlebar (S).

4. A coupling system according to any preceding claim, wherein the clamp (14) is configured to such that the cylindrical contour of the fork steering tube (30) around the axis of rotation of the handlebar (S): - in the clamped state, is surrounded by the clamp (14) over more than half of a perimeter of said contour, preferably over 80% to 100% of the perimeter; and - in the open state, is not surrounded by the clamp (14) over half or more of the perimeter of said contour, preferably over 50% to 80% of the perimeter.

5. A coupling system according to any preceding claim, wherein the steering coupling (10) comprises at least one locking element (40) configured to, when the fork steering tube (30) is inserted into the clamp (14) and aligned with the axis of rotation of the handlebar (S), in the open state: - prevent movement of the fork steering tube (30) in the direction of the axis of rotation of the handlebar (S); - allow movement of the fork steering tube (30) in a direction perpendicular to the axis of rotation of the handlebar (S), and / or wherein the locking element (40) is configured to have a self-positioning effect upon insertion and / or clamping of the fork steering tube (30) in the clamp (14).

6. A coupling system according to claim 5, wherein the locking element (40) respectively comprises: - a boss (42) mounted on an inner surface of the clamp (14) which projects in the direction of the fork steering tube (30) in the clamped state; and - a notch or opening (44) formed in the cylindrical contour of the fork steering tube (30) and configured so that the boss (42) of the clamp (14) enters said notch or opening (44) when the fork steering tube (30) is inserted into the clamp (14) and aligned with the axis of rotation of the handlebar (S).

7. A coupling system according to any preceding claim, wherein the clamp (14) comprises: - a fixed clamping part (16) which is fixed to the frame head tube (12); and - a movable clamping part (18) which is movably mounted relative to the fixed clamping part (16).

8. A coupling system according to claim 7, wherein: - the fixed clamping portion (16), in the clamped state, surrounds half or less of the perimeter of the cylindrical contour of the fork steering tube (30), preferably from 50% to 20% of the perimeter; and - the movable clamping portion (18), in the open state, does not clamp half or more of the perimeter of the cylindrical contour of the fork steering tube (30), preferably does not clamp 50% to 80% of the perimeter.

9. Coupling system according to claim 7 or 8, wherein the movable clamping part (18) is mounted on the fixed clamping part (16) about a pivot axis (P) parallel to the axis of rotation of the handlebar (S).

10. Coupling system according to claim 9, wherein the clamping collar (14) comprises a quick-clamping device (17) mounted on the fixed clamping part (16) so that: - in the clamped state, the quick-clamping device (17) exerts a clamping force on the movable clamping part (18); and - in the open state, the quick-clamping device (17) releases rotation of the movable clamping part (18) around the pivot axis (P).

11. A coupling system according to any preceding claim, the coupling system (10) further comprising: - a bracket coupling (50) mounted on a front module frame (4) of a front module (3), and configured for releasable connection of a front module connecting portion (60) to the frame (2) at a bracket (6), and wherein a front steering tube (5) is mounted on the front module frame (4) of the front module (3).

12. A coupling system according to claim 11, wherein the bracket coupling (50) comprises:

13.

14.

15. - a fixed clamping element (52) rigidly fixed to the front module frame (4); - a movable clamping element (54) pivotally mounted on the fixed clamping element (52); and - a tensioning element (56), preferably quick-tightening, configured to: • in a clamped state, holding the front module connection part (60) between the fixed clamping element (52) and the movable clamping element (54); and • in an open state, releasing the front module connection part (60) by means of the movable clamping element (54) to enable a tilting movement of the front module connection part (60) relative to the fixed clamping element (52). Coupling system according to claim 11 or 12, wherein the front module connecting part (60), the fixed clamping element (52) and / or the movable clamping element (54) are configured to have a self-positioning effect upon insertion and / or clamping of the front module connecting part (60) between the fixed clamping element (52) and the movable clamping element (54). Frame (2) of a bicycle or motorcycle, comprising a coupling system (1) according to any one of the preceding claims. An assembly comprising a bicycle or motorcycle frame according to claim 14 and one or more of the following elements: a fork with at least one sleeve for fixing a wheel axle, the fork steering tube (30) being mounted on said fork; a front module (3) comprising a front module frame (4), the fork head tube (30) being mounted on said front module frame (4); a front module (3) comprising a front module frame (4), the fork steering tube (30) being mounted on said front module frame (4) rotatably about its central longitudinal axis (30L); a front module (3) comprising a front module frame (4), a directional front fork (5) being mounted on said front module frame (4); a front module (3) comprising a front module frame (4), • the fork steering tube (30) being mounted on said front module frame (4) in a rotatable manner around its central longitudinal axis (30L); and • a directional front fork (5) being mounted on said front module frame (4), wherein the directional front fork (5) of the front module (3) is connected to the fork steering tube (30) by a steering rod.

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