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

[0003] According to a first aspect, a coupling system for a bicycle or motorcycle frame is provided, comprising: - A steering coupling, rotatably mounted on a portion of a steering frame around a handlebar rotation axis when in use, the steering coupling comprising: • A frame head tube with a central longitudinal axis aligned with the handlebar's axis of rotation; and • A clamp mounted at the bottom of the frame's head tube, configured to: • in a tight state, hold a fork steerer tube by applying a clamping force around a cylindrical contour of the fork steerer tube; and • in an open state, do not apply any further clamping force to the fork steering tube.

[0004] Thanks to this fixing, a robust coupling is achieved, which can also be made in a simple way 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's head tube coincides with the handlebar's axis of rotation; and - The central longitudinal axis of the fork steering tube coincides with the axis of rotation of the handlebar in the tightened state.

[0006] According to one embodiment, in the tightened 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 along the direction of the axis of rotation of the handlebar.

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

[0008] According to one embodiment, the steering coupling includes 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 when inserting and / or tightening 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 the fork steering tube is inserted and / or tightened in the clamp.

[0010] According to one embodiment, the locking element comprises respectively: - a boss mounted on an inner surface of the clamp that protrudes in the direction of the fork steering tube in the tightened state; and - a notch or 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 hose clamp comprises: - A fixed clamping part that is attached to the frame's head tube; and - A movable clamping part that is mounted in a movable manner relative to the fixed clamping part.

[0012] According to one embodiment: - the fixed clamping portion, in the tightened state, surrounds half or less of the perimeter of the cylindrical outline of the fork steerer tube, preferably 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 hose clamp includes a quick-release clamping device mounted on the fixed clamping part such that: - in the tightened state, the quick-release clamping device exerts a clamping force on the moving 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 coupling by supports mounted on a front module frame of a front module, and configured for the removable connection of a part of the front module fitting to the frame at a support, 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 attached to the front module frame; - a movable clamping element pivotally mounted on the fixed clamping element; and - a tensioning element, preferably quick-release, configured for: • In a tight position, hold the front module connecting part between the fixed clamping element and the moving clamping element; and • in an open state, release the front module connecting part by means of the movable clamping element to allow a tilting movement of the front module connecting part relative to the fixed clamping element.

[0017] According to one embodiment, the front module connecting part, the fixed clamping element and / or the mobile clamping element are configured so as to have a self-positioning effect when the front module connecting part is inserted and / or tightened between the fixed clamping element and the mobile clamping element.

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

[0019] According to a third aspect, an assembly is planned 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 attaching a wheel axle, the fork's 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 in a rotatable manner around 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 in a rotatable manner about its central longitudinal axis; and a directional front fork being mounted on said front module frame, where the directional front fork of the front module is connected to the fork steering tube by a steering bar. Brief description of the drawings

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

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

[0022] Fig. 5 shows a section along line VV in Fig. 1;

[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 coupling by supports 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 coupling by supports according to Figures 8 to 11. Description of the implementation methods

[0027] Fig. 1 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 presented in this description. In the embodiment of Fig. 1, the coupling system 1 includes a steering coupling 10. The steering coupling 10 is rotatably mounted on a part of the steering frame 20 around 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 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. 1] 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 so that, in the open state, it no longer subjects 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 can be seen in [Fig. 1], 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 its 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 around 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 around 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 fork legs 32 and change the direction of the bicycle.

[0030] It is clear that, in the tightened state, as shown in [Fig. 1], the clamping force exerted by the clamp 14 on the outer contour of the fork steerer 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 inwards by the clamp 14 ensures that the clamp 14 is fixed to the outer surface of the steerer tube 12.

[0031] As shown in [Fig. 1], the clamp 14 is configured such that the circular contour around the axis of rotation of the handlebar S of the fork steerer tube 30, in its tightened state, is entirely enclosed by the clamp 14. In other words, the fork steerer tube 30, which is preferably made of a single, elongated tubular element, is preferably entirely enclosed on its outer side by the clamp 14 as shown. However, it is clear that alternative versions are possible, where, in its tightened state, the fork steerer tube 30 is enclosed by the clamp 14 over more than half of its 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 axis of rotation of the handlebar S of the fork steerer tube 30, in its open state, is no longer enclosed by the clamp 14 for slightly more than half of the circular contour. However, it is clear that alternative configurations are possible, where, in its open state, the fork steerer tube 30 is not enclosed by the clamp 14 for half or more of the circular contour, preferably from 50% to 80% of the circular contour.

[0033] It is clear that, according to the embodiment shown, the fork steerer tube 30 has a circular circumference, and that the contact surfaces of the clamp 14 which connect to the fork steerer tube 30 form, in the tightened state, a circular fit. A cross-section along line VV, in the tightened state, is illustrated, for example, in [Fig. 5]. However, it is evident that alternative variants are possible, where the elongated, tubular fork steerer tube 30 can have any other suitable 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 embodiment shown in Figures 1 to 6, the clamp 14 comprises a fixed portion 16 that is securely attached to the head tube of the fork 12. Furthermore, the clamp 14 comprises a movable clamping portion 18 that is movable relative to the fixed portion 16. According to embodiment 8, the fixed portion 16, when tightened, surrounds half or less of the circular circumference of the fork steerer tube 30. As illustrated in [Fig. 5], it is clear that slightly less than half is surrounded, allowing for proper guidance of the fork steerer tube 30 during its insertion 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 steering tube 30 is surrounded by the fixed part 16 in the tight state..

[0035] As shown below, the example of the clamp 14 includes a movable clamping portion 18, which, in its open state as shown in [Fig. 6], does not encircle half or more of the circular circumference of the fork steerer tube 30. This allows the fork steerer tube 30 to be inserted into the clamp 14 simply and efficiently. It is clear that alternative versions are also possible where the movable clamping portion 18, preferably 50% to 80% of the circular circumference of the fork steerer tube 30, does not encircle the tube in its open state.

[0036] As seen in Figures 1 to 6, the movable clamping part 18 is articulated to the fixed part 16 around 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 clamping collar 14 in the open state and to tighten the clamping collar 14 in the tightened state.

[0037] As shown in Figures 1 to 4, the example of the hose clamp 14 includes a quick-release tensioner 17. The quick-release tensioner 17 is mounted on the fixed part 16 and can be removably connected to the movable clamping part 18. In the tightened state, as shown in [Fig. 1], the quick-release 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-release tensioner 17 releases the movable clamping part 18 for rotation about the hinge axis P. It is clear that the quick-release tensioner 17 is a component 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 by means of 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 tightened state of the clamp 14 and to open the clamp 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 carried out as follows. As shown in [Fig. 2], the clamping force present in the tightened state in [Fig. 1] is first removed by opening the quick tensioner 17. Opening the quick tensioner 17 then also allows the movable clamping part 18 to be inclined outwards as shown in [Fig. 3].

[0039] Next, the fork steering tube 30, as shown in [Fig.4], can be removed from the clamp 14 through the opening which 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 embodiment, the steering head coupling 10 includes a locking element 40 configured to, when the fork steerer 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 steerer tube 30 in the direction of the direction of rotation of the handlebar S. In other words, according to the embodiment shown, an upward and / or downward movement of the fork steerer tube 30 is prevented as long as the longitudinal central axis 30L of the fork steerer tube 30 is aligned with the axis of rotation of the handlebar S. As shown in [Fig. 7], which represents a view along arrow 7 in [Fig. 3], the steering head coupling 10 includes a locking element 40 configured to, when the fork steerer tube 30 is inserted into the clamp 14 and aligned with the axis of rotation of the handlebar S, block the movement of the fork steerer tube 30 in the direction of the direction of rotation of the handlebar S.3], such a locking element 40 may for example include 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 tightened 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 includes a notch or opening 44 on the outer contour of the fork steerer tube 30. This notch or opening 44 is formed so that the boss 42 of the clamp 14 enters this notch when the fork steerer 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 to have a self-positioning effect when the fork steerer tube 30 is inserted into the clamp 14 and tightened.According to the embodiment shown, this is achieved by a conical boss 42 which cooperates with the opening 44 during 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 during the insertion and tightening of the fork steerer tube 30 in the clamp 14, with the opening 44 of the fork steerer tube 30 ultimately resting against the base of the conical shape of the protrusion 42. However, it is clear that alternative versions are possible where such a locking element 40 with a self-positioning effect is used. It is also clear that 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 clamp 14 in the tightened state by preventing any movement along the central axis 14L. In such a configuration, the clamp 14 only or mainly has to support the transverse forces or those of rotation around the axis of rotation in 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 direction S, and helps to maintain the correct position and orientation of the steering tube 30 at all times. When inserted into the clamping 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 clear, however, that alternative designs are possible where such a self-positioning locking element 40 is installed. It is also clear that configurations are possible in which the clamping clamp 14 contains two or more of these locking elements 40.

[0043] It is clear that other embodiments 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 steerer tube 3 in a removable manner as described above.

[0044] According to another embodiment shown in Figures 8 to 11, the coupling system 10 also includes 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 steering 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 bike, 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. 1].Thus, a modular bicycle frame can be manufactured, which can be combined as needed with a fork for a front wheel and / or a front module for, for example, a cargo bike, a tandem, etc., or any other suitable bicycle or motorcycle configuration.

[0045] According to the embodiment shown in Figures 8 to 11, the bracket coupling 50 comprises a fixed part 52 attached 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 embodiment shown in Figures 8 to 11, the coupling part of the front module 60, the fixed part 50 and / or the movable clamping part 54 are configured so as to have a self-positioning effect when the coupling part of the front module 60 is inserted and / or clamped between the fixed part 50 and the movable clamping part 54. This is achieved according to this 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. 11], to reach a clearly defined position as illustrated in [Fig. 10].It is clear that the furthest end of the upward-facing hook shape is dimensioned so that it fits between two lateral 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]. Next, a second, higher-positioned transverse pin or axis of the front module part 60 can pivot against the base of the hook shape as illustrated in [Fig. 10], after which the movable clamping part 54, with its downward-facing hooks, can be tilted around this pin as shown in [Fig. 9], thus securing the position in both the vertical and transverse directions. Finally, the clamping is achieved by the quick-release tensioner 56 as illustrated 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 various modular elements. Such an assembly comprises, for example, a bicycle or motorcycle frame 2 with one or more of the above-described embodiments of the coupling system 1 and, in addition, one or more of the following elements: - a fork with at least one arm for fixing a wheel axle, to which the fork steering tube 30 is fixed, as shown in [Fig.1]; - a front module 3 comprising a front module frame 4 to which the fork steering tube 30 is attached; - a front module 3 comprising a front module frame 4 to which the fork steering tube 30 is rotatably mounted around 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 steerer tube 30 is rotatably mounted around its longitudinal central axis 30L; and • a steered front fork 5 is fixed, 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

Demands

1. 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 a handlebar (S) rotation axis when in use, the steering coupling (10) comprising: • a frame steering tube (12) with a central longitudinal axis (12L) along the handlebar (S) rotation axis; and • a clamp (14) mounted to a bottom of the frame steering tube (12), configured to: • in a tightened 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 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. Coupling system according to any one of claims 1 or 2, wherein, in the tightened state, the clamping force exerted by the clamping collar (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 one of the preceding claims, wherein the clamping collar (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 tightened 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. Coupling system according to any one of the preceding claims, wherein the steering coupling (10) comprises at least one locking element (40) configured to, when the fork steerer 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 steerer tube (30) in the direction of the axis of rotation of the handlebar (S); - allow movement of the fork steerer 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 when the fork steerer tube (30) is inserted and / or clamped into the clamp (14).

6. Coupling system according to claim 5, wherein the locking element (40) comprises respectively: - a boss (42) mounted on an inner surface of the clamp (14) which protrudes in the direction of the fork steering tube (30) in the tightened 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. Coupling system according to any one of the preceding claims, wherein the clamping collar (14) comprises: - a fixed clamping part (16) which is fixed to the frame's head tube (12); and - a movable clamping part (18) which is mounted movably relative to the fixed clamping part (16).

8. Coupling system according to claim 7, wherein: - the fixed clamping part (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 part (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) around 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-release clamping device (17) mounted on the fixed clamping part (16) such that: - in the clamped state, the quick-release clamping device (17) exerts a clamping force on the movable clamping part (18); and - in the open state, the quick-release clamping device (17) releases the movable clamping part (18) from rotation about the pivot axis (P).

11. Coupling system according to any one of the preceding claims, 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 the removable connection of a front module connecting part (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. Coupling system according to claim 11, wherein the coupling by supports (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-release, configured for: • in a tightened state, hold the front module connecting portion (60) between the fixed clamping element (52) and the movable clamping element (54); and • in an open state, release the front module connecting part (60) by means of the movable clamping element (54) to allow a tilting movement of the front module connecting 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 so as to have a self-positioning effect when the front module connecting part (60) is inserted and / or clamped between the fixed clamping element (52) and the movable clamping element (54). Bicycle or motorcycle frame (2), comprising a coupling system (1) according to any one of the preceding claims. 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 steering 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) in a rotatable manner around 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 about its central longitudinal axis (30L); and • a directional front fork (5) being mounted on said front module frame (4), where the directional front fork (5) of the front module (3) is connected to the fork steering tube (30) by a steering bar.

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