Bicycle rear wheel

Abstract

A rear wheel of a bicycle, comprising a rim (1) with spokes (2), a hub axle (3) on which at least one chain-driven wheel (5, 6) is rotatably mounted, and a one-way clutch assembly comprising a flange (9) and a disc (10) arranged adjacent to each other, coaxially mounted and having a gap (8), in which the flange is mounted on the hub axle (3) by means of a ball bearing, and the disc (10) is mounted on the hub axle (3) by means of a ball bearing. The disk (10) is integrated with the chain drive wheel (6). The flange and the disc respectively have side surfaces (91, 101) facing each other, one of the flange and the disc having teeth (11) on its side surface and the other of the flange and the disc having at least one hook (12) on its side surface, the hook (12) being positioned at a distance from the hub axle similar to or the same as the distance of the teeth (11) from the hub axle.

Description

Technical Field

[0001] The subject of the invention is a spoked bicycle rear wheel. Background Art

[0002] The rear wheel of a bicycle is usually made of a hub, to which a rim with a tire is connected by spokes. The hub consists of a hub axle, on which a rotatable hub body is mounted by ball-bearings. The hub body has a flange for fixing the spokes. A rotatable clutch body is mounted on one of the ends of the hub axle by ball bearings and has a spline for mounting a bicycle cassette consisting of a sprocket. The hub also includes a one-way clutch, the most common of which is a roller clutch, a ratchet clutch or a disc clutch.

[0003] A ratchet clutch consists of a rim and a pawl. The rim is usually a metallic serrated ring with internal teeth, while the pawl usually has a spring, due to which the pawl is pressed against the teeth of the ring, thus achieving engagement. In this case, the rim is connected to the hub body and the pawl is connected to the clutch body. The opposite arrangement is also possible, in which the rim is made with external teeth and connected to the clutch body, and the pawl is in the hub body. One pawl is sufficient to achieve coupling, but the number of engagement points affects the ride, so the aim is to increase the number of engagement points. In this solution, the greater the torque transmitted, the greater the force that presses the clutch elements together.

[0004] Another type of bicycle clutch is the disc clutch, which consists of two mutually locked discs. The two discs have a lateral clearance relative to their axes and are at the same time axially coupled to these axes. The coupling occurs due to the pressure of the discs relative to each other, which can be achieved, for example, by springs. Such a clutch has a greater ability to transmit torque. The force that presses the clutch discs together depends on the inclination angle of the teeth and the torsional torque. The pressure can also be achieved by using neodymium magnets.

[0005] From the disclosure of patent specification US10752320B2, a bicycle rear wheel hub assembly is known, comprising: a hub axle, which includes a through hole for an axle with a minimum inner diameter equal to or greater than 13 mm; a hub body, which is rotatably mounted on the hub axle around a rotation center axis; and a gear clutch body, which is rotatably mounted on the hub axle, the clutch body including at least one external spline tooth for engaging the rear gear assembly of the bicycle. The tooth includes a spline, which receives the torque generated during pedaling. The splined outer drive surface includes a radial spiral edge that cooperates with a toothed disc. The radial spiral edge allows one toothed disc to move relative to the other toothed disc. This solution is characterized by a small number of interlocking points and a rather complex structure.

[0006] A bicycle hub is known from the disclosure of utility model DE202021106715U1, comprising: a central shaft, which serves as a rotation axis of the bicycle hub; a main body, which is rotatably connected to the central shaft; a free wheel, which is pivotally connected to the central shaft and is designed to be connected to a set of sprockets, the free wheel having a plurality of spline teeth. The hub comprises a clutch assembly, which comprises two ratchet discs, each of which has teeth and splines for sliding engagement in a longitudinal direction. One of the ratchet discs is connected to the main body so that it can drive the main body to rotate, and the other ratchet disc is connected to a one-way clutch so that it can drive the one-way clutch. The clutch assembly comprises an adjusting element connected to the second ratchet disc, and applies a force to move the second ratchet disc so that the second ratchet disc returns to its initial position. The adjusting element is a spring, a magnet or is made of an elastic material.

[0007] The published text of application CN114055996A discloses a structure of a one-way transmission hub (gear hub) and a bicycle. The mechanism includes a hub assembly and a ratchet assembly. The ratchet assembly is installed by a first meshing mechanism, and the ratchet assembly is coupled to the hub assembly by a second meshing mechanism. The ratchet assembly is a one-way support structure, and includes a ratchet seat and a ratchet sleeve. There are rolling elements and springs supporting corresponding rolling elements in the ratchet groove. The ratchet sleeve covers the ratchet groove and all springs and rolling elements in the ratchet groove. The spring squeezes the corresponding rolling element to contact the ratchet seat and the ratchet sleeve. The mass of the structure is large. In addition, there is a large radial force in the structure. Therefore, the solution may have lower durability.

[0008] Patent publication US10723174B2 relates to a bicycle flywheel having two annular bodies. A first annular ferromagnetic body rotates with a bicycle sprocket and includes a first crown ring gear. A second annular body rotates with the rear wheel of the bicycle and has a second crown ring gear that matches the first crown ring gear and faces in its direction. The first annular body can be axially moved relative to the second annular body between an engaged state and a disengaged state, in which the first annular gear is coupled to the second annular gear, and in which they are disengaged. At least one magnet is arranged radially outward from the first annular body so that the first annular body is at least partially accommodated in the axial space of the magnet in the disengaged state.

[0009] Technical issues

[0010] The object of the present invention is to propose a structure of a bicycle rear wheel, which is characterized by a simple structure and quiet operation when the elements forming the one-way clutch are not coupled. The simplicity of design will reduce the number of structural elements, so the wheel will be lighter, easier to manufacture, more environmentally friendly, and its maintenance will also be easier. Summary of the invention

[0011] The essence of a bicycle rear wheel (comprising a tire rim with spokes, a hub axle and a one-way clutch assembly, on which at least one chain drive wheel is rotatably mounted) is that the one-way clutch assembly is composed of a flange and a disk, which are arranged adjacent to each other, coaxially disposed and have slots, wherein the flange is mounted on the hub axle through a ball bearing, and the disk is integrated with the chain drive wheel. These elements have side surfaces facing each other, wherein one of the elements, the flange or the disk, has teeth on its side surface, and the other element has at least one hook on its side surface corresponding to the position of the teeth.

[0012] Preferably, the second one of said flange or said disc of the element has on its side surface a plurality of hooks corresponding to the positions of the teeth.

[0013] Preferably, the teeth and the hooks are arranged on a circle, the radius of the circle (along which at least one hook is positioned) being in the following range: r=R-0.5g-10mm÷R+0.5g+10mm, wherein R is the radius of the circle along which the teeth are arranged, and g is the width of the teeth.

[0014] Preferably, the radius of the circle along which the teeth and the hooks are arranged is the same.

[0015] Preferably, the flange is part of the hub body.

[0016] Preferably, said spokes are connected to said flange.

[0017] Preferably, the hooks are arranged symmetrically with respect to the axis of the hub.

[0018] Preferably, the hook is a loop.

[0019] Preferably, the hook is rigidly fixed with an initial compression bend so as to catch the tooth.

[0020] Preferably, there are at least two hooks for engaging one tooth.

[0021] Preferably, the hooks have different lengths and the difference in length of the terminal hooks is smaller than the distance between consecutive tips of the teeth.

[0022] Preferably, the tooth has a concave side surface on the side opposite to the rotation direction of the element in which it is located, and / or the tip of the tooth is offset toward the bottom of the notch, the notch is located on the side opposite to the rotation direction of the element in which it is located, and the tooth has a convex side surface from the side consistent with the rotation direction of the element.

[0023] Preferably, the width of the teeth does not exceed 30 mm.

[0024] Preferably, the diameter of the circle on which the teeth and hooks are arranged is not less than 60 mm and not more than 55% of the rim diameter.

[0025] Technical Effects

[0026] The solution of the invention therefore aims to simplify the structure of the bicycle hub and rear wheel. The use of a flange and a disc, one of the elements having teeth and the other having one or more hooks, allows to reduce the number of structural elements, for example, this solution allows to use a hub body with a simplified structure. The lower number of elements has an impact on reducing the failure rate. Wheel repair becomes easier. The use of flanges and discs of the design shown eliminates the knocks that occur in the case of decoupled mechanisms of traditional and known solutions. Precisely, the hooks, especially the ones that "jump over" the teeth as a ring in the disengaged state, are much quieter than the pawls in ratchets or disc clutches, for example. In addition, the solution envisages that the diameter of the circle on the flange and disc, along which the teeth and hooks are arranged, will be no less than 60 mm and no more than 55% of the rim. The use of flanges and discs of such dimensions allows multiple connection points, which increases the precision of the coupling. Many connection points also increase the reliability and safety of the mechanism - the damage of one of the connection points will not lead to wheel failure. In addition, contrary to the known solutions, the operation of the hooks is based on tension, not compression. Another advantage is that, due to the larger dimensions than those of known clutch elements, the driving forces acting on the teeth and hooks are smaller, which further increases the safety of the structure. The application of a plurality of hooks of different lengths, where the difference in length of the end hooks is smaller than the distance between the tips of the teeth, allows increasing the number of catching points with an unchanged number of teeth. This ensures an increase in the sensitivity of the clutch, for example with a smaller number of hook connection points. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The subject matter of the invention is presented in exemplary embodiments in the accompanying drawings, in which:

[0028] Figure 1 The rear wheel of a bicycle is shown schematically.

[0029] Figure 2 A cross section of a wheel in a variant with teeth on the flange is shown schematically.

[0030] Figure 3 A side view of a flange surface with teeth arranged along a circle is schematically shown.

[0031] Figure 4 Schematically shown is a side view of a disc surface with hooks arranged along a circle.

[0032] Figure 5 Schematically showing the Figure 3 and Figure 8 An enlarged view of the tooth structure viewed in the direction of arrow "A" is shown in FIG.

[0033] Figure 6Schematically shown is a cross section of a wheel in a variant with teeth on the disc.

[0034] Figure 7 Schematically shown is a side view of a flange surface with hooks arranged along a circle.

[0035] Figure 8 Schematically shown is a side view of a disk surface with teeth arranged along a circle.

[0036] Fig. 9 A variant with multiple hooks for grabbing a tooth is schematically shown in a side view.

[0037] Fig.10 Schematic representation of the way in which a tooth is grasped by multiple hooks.

[0038] Fig.11 A side view of the surface of one of the elements is schematically shown: the flange or disc has teeth arranged in a manner other than along a circle.

[0039] Fig.12 A side view of the surface of another element is schematically shown: a flange or a disc having hooks arranged in a manner other than along a circle.

[0040] Fig.13 Schematically shows a flange or disk with teeth arranged in a manner other than along a circle. Fig.11 Section BB is shown. DETAILED DESCRIPTION

[0041] Example 1

[0042] like Figure 1 As shown in FIG. 1 , the rear wheel of the bicycle is composed of a rim 1 with spokes 2 and a hub axle 3. The following components are rotatably mounted on the hub axle 3 via ball bearings: a hub body 4, and a flywheel 5 with a chain drive wheel 6. Figures 2 to 4 As shown, the wheel includes a one-way clutch assembly 71, which consists of a flange 9 and a disc 10 arranged in parallel, mounted coaxially and with a gap 8 therebetween. The flange 9 is mounted on the hub axle 3 via a ball bearing, and the disc 10 is integrated with the largest chain drive wheel 6. Elements 9 and 10 have respective side surfaces 91 and 101 facing each other. In this exemplary embodiment, the flange 9 has teeth 11 on its side surface 91, and the disc 10 has a plurality of hooks 12 on its side surface 101. These hooks 12 are annular. The teeth 11 and the hooks 12 are arranged along a circle with the same radius (R=r). The flange 9 is part of the hub body 4. The spokes 2 are fixed to the flange 4. The hooks 12 are arranged symmetrically with respect to the axis 3 of the hub. The annular hooks 12 are rigidly fixed with an initial compression bend so as to catch the teeth 11. As Figure 5As shown, the tooth 11 has a concave side surface 13 on the side opposite to the rotation direction of the flange 9, and the tip A of the tooth 11 is offset towards the bottom of the notch 14, which is located on the side of the tooth 11 opposite to the rotation direction of the flange 9. On the side consistent with the rotation direction of the flange 9, the tooth 11 has a convex side surface 13. The width g of the tooth 11 is 9 mm. The diameter of the circle on which the teeth 11 and the hooks 12 are arranged ranges from 60 mm to (÷) 55% of the rim diameter.

[0043] Example 2

[0044] The wheel was manufactured in the same manner as in Example 1, except that: Figures 6 to 8 In the one-way clutch assembly 72 shown, the flange 9 has a plurality of hooks 12 on its side surface 91, and the disk 10 has teeth 11 on its side surface 101. The teeth 11 have a concave side surface 13 on the side opposite to the rotation direction of the disk 10, and the tip A of the teeth 11 is offset toward the bottom of the notch 14, which is located on the side of the teeth 11 opposite to the rotation direction of the disk 10. On the side consistent with the rotation direction of the disk 10, the teeth 11 have a convex side surface 13.

[0045] Example 3

[0046] The wheel is manufactured in the same manner as in Example 1 or 2, except that: on the side surface 91 of the flange 9 or the side surface 101 of the disc 10, there are three hooks 12 for hooking one tooth 11. The hooks 12 have different lengths, and the difference in length of the end hooks 11 is less than the distance between the consecutive tips A of the teeth 11- Fig. 9 , Fig.10 .

[0047] Example 4

[0048] The wheel is manufactured in the same manner as in Example 1 or 2, except that teeth 11 are provided on the side surface 91 of the flange 9 or the side surface 101 of the disc 10, respectively, and hooks 12 are provided on the side surface 91 or 101 of the second element of the clutch assembly 71, 72. The teeth 11 are located at different distances from the axis 3 of the hub. At the same distance from the axis 3 of the hub, a hook 12 is provided at each tooth 11. Fig.11 , Fig.12 The hooks 12 are arranged with an angular offset, so that at a given position of the elements (flange 9 and disc 10) rotated relative to each other, it is possible to hook another tooth 11 with the hook 12.

[0049] Components List:

[0050]

Claims

1. A bicycle rear wheel, comprising a wheel rim with spokes, a hub axle and a one-way clutch assembly, at least one chain drive wheel rotatably mounted on the hub axle, characterized in that: The one-way clutch assembly (71, 72) is composed of a flange (9) and a plate (10), wherein the flange (9) and the plate (10) are positioned adjacent to each other, arranged coaxially and having a gap (8), wherein the flange (9) is mounted on the hub wheel shaft (3) via a ball bearing, and the plate (10) is integrated with the chain drive wheel (6), and these elements have side surfaces (91, 101) facing each other, wherein one of the elements: the flange (9) or the plate (10) has teeth (11) on its side surface (91, 101), and the other element (9, 10) has at least one hook (12) on its side surface (91, 101), and the position of the at least one hook (12) is similar or the same as the position of the teeth (11) from the axis (3) of the hub.

2. The bicycle rear wheel according to claim 1 or 2, characterized in that: The other of the elements: the flange (9) or the disc (10), has a plurality of hooks (12) on its side surface (91, 101), the positions of the hooks (12) corresponding to the positions of the teeth (11).

3. The bicycle rear wheel according to claim 1 or 2, characterized in that: The teeth (11) and the hooks (12) are arranged along a circle, wherein the radius (r) of the circle on which at least one hook (12) is arranged is within the following range: r=R-0.5g-10mm÷R+0.5g+10mm, wherein R is the radius of the circle along which the teeth (11) are arranged, and g is the width of the teeth (11).

4. The rear wheel according to claim 3, characterized in that: The radii (R, r) of the circles along which the tooth (11) and the hook (12) are positioned are the same.

5. The rear wheel according to any one of claims 1 to 4, characterized in that: The flange (9) is a part of the hub body (4).

6. The rear wheel according to any one of claims 1 to 5, characterized in that: The spokes (2) are fixed to the flange (9).

7. The bicycle rear wheel according to any one of claims 1 to 6, characterized in that: The hooks (12) are arranged symmetrically relative to the hub axle (3).

8. The bicycle rear wheel according to any one of claims 1 to 7, characterized in that: The hook (12) is a ring.

9. The bicycle rear wheel according to claim 8, characterized in that: The hook (12) is rigidly connected with an initial bending so as to grasp the tooth (11).

10. The bicycle rear wheel according to any one of claims 1 to 9, characterized in that: There are at least two hooks (12) to hook one tooth (11).

11. The bicycle rear wheel according to claim 10, characterized in that: The hooks (12) have different lengths, and the difference in length of the end hooks (12) is smaller than the distance between consecutive tips (A) of the teeth (11).

12. The bicycle rear wheel according to any one of claims 1 to 11, characterized in that: The tooth (11) has a concave side surface (13) on the side opposite to the rotation direction of the element (9, 10) on which it is located, and / or the tip (A) of the tooth (11) is offset toward the bottom of a notch (14), the notch (14) being located on the side opposite to the rotation direction of the element (9, 10) on which it is located, and the tooth (11) has a convex side surface (13) on the side consistent with the rotation direction of the element (9, 10).

13. The bicycle rear wheel according to any one of claims 1 to 12, characterized in that: The width (g) of the teeth (11) does not exceed 30 mm.

14. The bicycle rear wheel according to any one of claims 1 to 13, characterized in that: The diameter of the circle along which the teeth (11) and the hooks (12) are arranged is not less than 60 mm and not greater than 55% of the diameter of the rim (1).

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