Rear wheel of a bicycle

Abstract

The rear wheel of a bicycle includes a tire rim (1) with spokes (2), a hub body (4), a hub axle (3) to which chain drive wheels (5, 6) are attached, and a one-way clutch assembly (71, 72). The clutch assembly is composed of a rim (8) with internal teeth (81) and a disk (9) with at least one hook (91) engaging the internal teeth. They are coaxially arranged. The rim has an internal radius (R) and defines a circle where the tip (A) of the internal teeth is located, which is larger than the radius (r) of a circle (92) where there is a fixing part (93) on the disk. Either the rim or the disk is integrally provided with the chain drive wheel, and the spokes are fixed to the other of the disk and the rim.

Description

Technical Field

[0001] The subject of the present invention is the rear wheel of a bicycle equipped with spokes.

Background Art

[0002] The rear wheel of a bicycle usually consists of a hub with a tire - attached rim via spokes. The hub is composed of a hub shaft on which a rotatable hub body is attached by ball bearings. The hub body is provided with a flange for fixing the spokes. At one end of the hub shaft, a rotatable clutch body is attached by ball bearings, and a spline for attaching a bicycle cassette composed of sprockets is provided. The hub also includes a one - way clutch, and roller clutches, ratchet clutches, and disc clutches are the most common.

[0003] A ratchet clutch is composed of a rim and a pawl. The rim is usually a metal - made serrated ring with internal teeth, and the pawl usually has a spring, and the spring presses the pawl against the teeth of the ring to engage. In this case, the rim is attached to the hub body and the pawl is attached to the clutch body. The reverse arrangement is also possible. In this case, the rim is made with external teeth, attached to the clutch body, and the pawl is on the hub body. One pawl is sufficient for connection, but increasing the number of engagement points is aimed at because it affects the riding comfort. In this solution, the greater the transmission torque, the greater the force pressing the clutch elements together.

[0004] Another type of bicycle clutch is a disc clutch, which is formed by two discs meshing. Both discs have lateral play with respect to the shaft and are simultaneously axially coupled to the shaft. The coupling is generated by the pressure of the discs against each other, which is achieved, for example, by a spring. Such a clutch has a greater torque transmission capacity. The force with which the clutch discs are pressed against each other depends on the inclination angle of the teeth and the torsional torque. The pressure can also be achieved using neodymium magnets.

[0005] The rear wheel hub assembly of a bicycle is well-known from the publication of Patent Document 1, and includes a hub shaft having a through-hole for an axle with a minimum inner diameter of 13 mm or more, a hub body rotatably attached to the hub shaft about a central rotation axis, and a gear clutch body rotatably attached to the hub shaft. The clutch body includes at least one external spline tooth for meshing with the rear wheel gear assembly of the bicycle. This tooth includes a spline that receives the torque generated during pedaling. The splined outer drive surface includes a radial helical edge that cooperates with a toothed disk. Due to the radial helical edge, one toothed disk is movable relative to the other toothed disk. The feature of this solution is that the number of meshing points is small and the structure is somewhat complex.

[0006] From the publication of Patent Document 2, a bicycle hub is well-known that includes a central shaft that functions as a rotation axis of the bicycle hub; a body rotatably connected to the central shaft; and a freewheel rotatably connected to the central shaft and designed to be connected to a set of sprockets and having a plurality of spline teeth. The hub includes a clutch assembly consisting of two ratchet disks each having teeth and splines for sliding engagement along the longitudinal direction. One of the ratchet disks is connected to the body so as to be able to rotationally drive the body, and the other disk is connected to a one-way clutch so as to be able to drive the one-way clutch. The clutch assembly includes an adjustment element that is connected to the second ratchet disk and exerts a force to displace the second ratchet disk, thereby returning the second ratchet disk to its original position. The adjustment element is a spring, a magnet, or made of an elastic material.

[0007] Patent Document 3 discloses a one-way gear hub and a structure of a bicycle. This mechanism includes a hub assembly and a ratchet wheel assembly. The ratchet wheel assembly is attached by a first engagement mechanism, and the ratchet wheel assembly is coupled to the hub assembly by a second engagement mechanism. The ratchet wheel assembly is a one-way support structure and includes a ratchet wheel seat and a ratchet wheel sleeve. In the socket of the ratchet wheel, there are rolling elements and springs for supporting the respective rolling elements. The ratchet wheel sleeve covers the ratchet wheel socket and all the springs and rolling elements within the ratchet wheel socket. The springs press the respective rolling elements into contact with the ratchet wheel seat and the ratchet wheel sleeve. This structure has a large mass. Furthermore, a large radial force is applied to the structure. As a result, this solution may have low durability.

[0008] Patent Document 4 relates to a freewheel for a bicycle having two annular bodies. The first annular ferromagnetic body rotates together with the sprocket of the bicycle and includes a first crowning ring gear. The second annular body rotates together with the rear wheel of the bicycle, meshes with the first crowning ring gear, and has a second crowning ring gear facing in that direction. The first annular body is axially movable relative to the second annular body between an engaged state in which the first ring gear is coupled to the second ring gear and a disengaged state in which the two are separated. At least one magnetic body is disposed radially outward from the first annular body such that the first annular body in the disengaged state is at least partially received within the axial space of the magnetic body.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

[0010] An object of the present invention is to propose a structure of a rear wheel of a bicycle characterized by a simple structure and quiet operation in a state where elements forming a one-way clutch are not coupled. Since the design is simple, the number of structural elements is reduced, and as a result, the wheel is lightened, manufacturing becomes easier, it becomes more ecological, and its service also becomes easier. [Means for Solving the Problems]

[0011] The essence of a rear wheel of a bicycle composed of a spoked tire rim, a hub shaft to which at least one drive chain wheel is rotatably attached, and a one-way clutch assembly is that the one-way clutch assembly is composed of a rim having internal teeth and a disk having at least one hook for meshing with the internal teeth, which are coaxially arranged, and is fixed on the circumference of the disk. The rim has an inner radius that defines a circle where the tips of the teeth are located, and this radius is larger than the radius of the circle on the disk where the attachment points of at least one hook are located. One of the elements of the one-way clutch assembly, either the rim or the disk, is provided integrally with the chain drive wheel, and the spokes are respectively attached to the disk or the rim, which is the second element of the one-way clutch assembly.

[0012] Preferably, the rim has a thickness of 30 mm or less and is arranged concentrically with the disk.

[0013] Preferably, the rim and the disk have a thickness of 9 mm or less and are arranged concentrically with respect to each other.

[0014] Preferably, the disk consists of a plurality of hooks.

[0015] Preferably, the hooks are arranged symmetrically with respect to the axle of the hub.

[0016] Preferably, the hook is a loop.

[0017] Advantageously, the hook is firmly fixed on the circumference of a disk having a first pressing and bending portion for receiving the inner teeth of the rim.

[0018] As an alternative, at least two hooks for engaging with one of the inner teeth of the rim are mentioned.

[0019] Preferably, one end of the hook has an attachment portion on the first side surface of the disk, the other end of the hook has an attachment portion on the other side surface of the disk, and the hook is fixed to the same attachment portion.

[0020] Alternatively, both ends of at least one hook are attached to the first side surface of the disk, both ends of at least one hook are attached to the other side surface of the disk, the hook is attached at the same attachment position, and a loop is formed that is mirror - related to each other when fixed to the first side surface and the second side surface and faces the inner teeth.

[0021] As an alternative, at least two hooks are attached to a disk having a first pressing and bending portion, the hooks have different lengths, and the difference in the lengths of the outermost hooks is smaller than the distance between the tops of the inner teeth.

[0022] Preferably, the disk has recesses for the hooks on its circumference.

[0023] Preferably, the side surface of the tooth on the side opposite to the rotational direction of the rim is recessed, and / or the tip of the tooth is offset towards the bottom of the notch located on the side surface of the tooth on the side opposite to the rotational direction of the rim.

[0024] Preferably, the rim with inner teeth is provided integrally with the largest chain drive sprocket.

[0025] Preferably, the pitch diameter of the rim is 60 mm or more and 55% or less of the wheel rim diameter.

[0026] As an alternative, the disk or rim, which is the second element of the one-way clutch assembly, is provided integrally with the flange of the hub body, and the spokes are attached to the flange.

[0027] The essence of the rear wheel of a bicycle, which consists of a tire rim having spokes, a hub shaft to which at least one chain drive wheel is rotatably attached, and a one-way clutch assembly, is based on the fact that the one-way clutch assembly is composed of a disk having external teeth arranged coaxially and a rim having at least one hook for engaging with the external teeth fixed to the inner circumference of the rim. The disk has a radius that defines a circle at which the tips of the teeth are located, and this radius is smaller than the radius of the circle on the rim where the attachment points of at least one hook are located. One of the elements of the one-way clutch assembly, either the rim or the disk, is provided integrally with the chain drive wheel, and the spokes are attached to the disk or rim, which is the second element of the one-way clutch assembly, respectively.

[0028] Preferably, the disk has a thickness of 30 mm or less and is arranged concentrically with the rim.

[0029] Preferably, the disk and the rim have a thickness of 9 mm or less and are arranged concentrically with respect to each other.

[0030] Preferably, the rim consists of a plurality of hooks.

[0031] Preferably, the hooks are arranged symmetrically with respect to the axle of the hub.

[0032] Preferably, the hook is a loop.

[0033] Advantageously, the hook is firmly fixed on the circumference of the rim having a first pressing and bending portion for receiving the external teeth of the disk.

[0034] Alternatively, there are at least two hooks for engaging one external tooth of the disk.

[0035] Preferably, one end of the hook has an attachment portion on the first side surface of the rim, the other end of the hook has an attachment portion on the other side surface of the rim, and the hooks are fixed to the same attachment portion.

[0036] Alternatively, both ends of at least one hook are attached to the first side surface of the rim, and both ends of at least one hook are attached to the other side surface of the rim. The hooks are attached at the same attachment position, and a loop facing the external teeth is formed so as to be in a mirror image relationship with each other when fixed to the first side surface and the second side surface.

[0037] As an alternative, at least two hooks are attached to the rim at the first pressing and bending portion, the hooks have different lengths, and the difference in length of the outermost hooks is smaller than the distance between the tops of the external teeth.

[0038] Preferably, the rim has a recess for the hook on its inner circumference.

[0039] Preferably, the side surface of the tooth on the side opposite to the rotation direction of the disk is recessed and / or the tip of the tooth is offset toward the bottom of the notch located on the side surface of the tooth on the side opposite to the rotation direction of the disk.

[0040] Preferably, the pitch diameter of the disk is 60 mm or more and 55% or less of the wheel rim diameter.

[0041] As an alternative, the disk or the rim, which is the second element of the one-way clutch assembly, is provided integrally with the flange of the hub body, and the spokes are attached to the flange.

Advantages of the Invention

[0042] Therefore, this solution basically provides two variants of the one-way clutch assembly. In one variant, the clutch assembly consists of a rim with internal teeth arranged coaxially and a disk with at least one hook for engaging the internal teeth fixed on the circumference of the disk. In the other variant, the clutch assembly consists of a disk with external teeth arranged coaxially and a rim with at least one hook for engaging the external teeth fixed on the inner circumference of the rim. Both types are solutions that simplify the structure of the bicycle hub and rear wheel. By using the disk and the rim, the number of structural elements can be reduced. For example, with this solution, a hub body with a simplified structure can be used. Fewer elements lead to a reduction in the failure rate and easier wheel maintenance. By using the disk and the rim of the indicated design, the knocking that occurred in the disengaged state of the mechanism in the conventional known solutions is eliminated. Specifically, the hook, especially the hook made as a loop that "jumps over" the teeth in the disengaged state, is much quieter than, for example, the pawls of a ratchet or a disk clutch. Furthermore, in this solution, the element containing teeth, i.e., the disk with external teeth or the rim with internal teeth, is assumed to have a pitch diameter of 60 mm or more and 55% or less of the wheel rim. By using a disk or a rim of such dimensions, a plurality of attachment points can be provided to increase the accuracy of the coupling. More attachment points also enhance the reliability and safety of the mechanism. Even if one of the attachment points is damaged, the wheel will not fail. Furthermore, different from the known solutions, the operation of the hook is based on tension rather than compression. Another advantage is that since the dimensions of the clutch elements are larger than known ones, the driving force acting on the teeth and the hooks is reduced, further improving the safety of the structure. By fixing both ends of at least one hook to the first side surface of the rim or the disk and fixing both ends of at least one hook to the other side surface of the rim or the disk, and using a plurality of hooks fixed at the same attachment points, the catching on the teeth becomes more stable.On the one hand, when using a number of hooks with different lengths where the difference in the lengths of the hooks at the outermost ends is smaller than the distance between the tops of the teeth, it is possible to increase the number of capture points while keeping the number of teeth on the circumference of the disk or rim constant. As a result, for example, even if the number of hook attachment locations is reduced, an improvement in clutch sensitivity is guaranteed.

Brief Description of the Drawings

[0043]

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[0044] The subject matter of the present invention is illustrated in exemplary embodiments in the drawings.

Mode for Carrying Out the Invention

[0045] (Example 1) As shown in Fig. 1, the rear wheel of the bicycle is composed of a tire rim 1 with spokes 2 and an axle 3 of the hub. The following components are rotatably attached to the axle 3 of the hub by ball bearings: a hub body 4 and a cassette 5 with a chain drive wheel 6. The wheel includes a one-way clutch assembly 71 shown in Figs. 2-4, which is composed of a rim 8 with internal teeth 81 and a disk 9 with hooks 91 for engaging with the internal teeth 81, arranged coaxially. The hooks 91 are firmly fixed to the outer periphery of the disk 9. Although the hooks 91 are arranged asymmetrically with respect to the axle 3 of the hub, in a preferred modification not shown in the drawings, a symmetrical distribution is designed for the equal distribution of forces. The rim 8 has an internal radius R that defines a circle where the tip A of the internal teeth 81 is located, and this radius is larger than the radius r of the circle 92 on the disk 9 where the attachment point 93 of the hooks 91 is located. In this exemplary embodiment, the rim 8 is provided integrally with the largest chain drive wheel 6. Although not shown in the drawings, it is also possible to provide the rim 8 integrally with the largest chain drive wheel 6 such that the internal teeth 81 are formed on the inner circumference of the largest chain drive wheel 6. The disk 9 is attached to the hub body 4 and has holes 94 for fixing the spokes 2. The rim 8 and the disk 9 have a thickness of 3 mm and are arranged concentrically with respect to each other. The hooks 91 are loops made of a material that shrinks under pressure. One end of the hook 91 has its fixing portion 93 on the first side surface 96a of the disk 9, and the other end of the hook 91 has its fixing portion on the other side surface 96b of the disk 9. The loop-shaped hook 91 is fixed on the circumference of the disk 9 in a first bent state to effectively catch on the internal teeth 81 of the rim 8. The hook 91 caught on the internal teeth 81 exerts a clutch effect between the disk 9 and the rim 8, enabling torque transmission from the chain drive wheel 6 to the disk 9 and thus to the wheel. When the driven wheel rotates faster than the chain drive wheel 6, the engagement disengages and the hook 91 slips off the internal teeth 81. To make the catching effect of the hook 91 on the internal teeth 81 better and more reliable, the side surface 82 of the internal teeth 81 on the side opposite to the rotation direction of the rim 8 is recessed, and the tip A of the internal teeth 81 is offset towards the bottom 83 of the notch on the side surface of the internal teeth 81 on the side opposite to the rotation direction of the rim 8.The disk 9 has a recess 95 for the hook 91 on its outer periphery. In the recess 95, the hook 91 is hidden in the disengaged state. The pitch diameter of the rim 8 exceeds 60 mm and is less than 55% of the diameter of the rim 1 of the wheel.

[0046] (Example 2) As shown in Fig. 1, the rear wheel of the bicycle is composed of a tire rim 1 with spokes 2 and an axle 3 of the hub. The following components, ball bearings, are rotatably attached to the axle 3 of the hub: a hub body 4 and a cassette 5 with a chain drive wheel 6. The wheel includes a one-way clutch assembly 72 shown in Figs. 5 and 6, which is composed of a rim 8 having internal teeth 81 and a disk 9 having a plurality of hooks 91 for engaging with the internal teeth 81, arranged coaxially. The hooks 91 are fixed to the outer circumference of the disk 9. Although the hooks 91 are arranged asymmetrically with respect to the axle 3 of the hub as shown in Fig. 2, in a preferred modification not shown in the drawings, they are assumed to be arranged symmetrically. The rim 8 has an inner radius R that defines a circle where the tip A of the internal teeth 81 is located, and the radius R is larger than the radius r of the circle 92 on the disk 9 where the attachment point 93 of the hooks 91 is located. In this exemplary embodiment, the disk 9 is provided integrally with the largest chain drive wheel 6, and its diameter is larger than the diameter of the largest chain drive wheel 6. On the other hand, the rim 8 is attached to the hub body 4 and has holes 84 for fixing the spokes 2. The rim 8 and the disk 9 have a thickness of 3 mm and are arranged concentrically with respect to each other. The hooks 91 are loops made of a material that shrinks under pressure. One end of the hook 91 has its fixing portion 93 on the first side surface 96a of the disk 9, and the other end of the hook 91 has its fixing portion on the other side surface 96b of the disk 9. The hook 91, which is a loop, is fixed on the circumference of the disk 9 in a first bent state to effectively catch on the internal teeth 81 of the rim 8. The hook 91 caught on the internal teeth 81 exerts a clutch effect between the disk 9 and the rim 8, enabling torque transmission from the chain drive wheel 6 to the rim 8 and thus to the wheel. When the driven wheel rotates faster than the chain drive wheel 6, the engagement disengages and the hook 91 slips off the internal teeth 81. To ensure a good and reliable catching effect of the hook 91 on the internal teeth 81, the side surface 82 of the internal teeth 81 on the side opposite to the rotation direction of the rim 8 is recessed, and the tip A of the internal teeth 81 is displaced towards the bottom 83 of the notch on the side surface of the internal teeth 81 on the side opposite to the rotation direction of the rim 8. The disk 9 has recesses 96 for the hooks 91 on its outer circumference. In the recesses 96, the hooks 91 are hidden in a disengaged state.The pitch diameter of the rim 8 exceeds 60 mm and is less than 55% of the diameter of the wheel rim 1.

[0047] (Example 3) As shown in Fig. 1, the rear wheel of the bicycle consists of a tire rim 1 with spokes 2 and a hub axle 3. The following components are rotatably attached to the hub axle 3 by ball bearings: a hub body 4 and a cassette 5 with a chain drive wheel 6. The wheel includes a one-way clutch assembly 73 shown in Figs. 7 and 8, which is composed of a disk 800 having outer teeth 801 and a rim 900 having a plurality of hooks 901 for engaging with the outer teeth 801. The hooks 901 are firmly fixed to the inner circumference of the rim 900. The hooks 901 are symmetrically arranged with respect to the hub axle 3 not shown in the drawings. The disk 800 has an inner radius r' that defines a circle where the tip A' of the outer teeth 801 is located, and this radius is smaller than the inner radius R' of the circle 902 on the rim 900 where the fixing portion 903 of the hook 901 is arranged. In this exemplary embodiment, the disk 800 is provided integrally with the largest chain drive wheel 6 so as to be attached thereto as another toothed gear. The rim 900 is attached to the hub body 4 and has holes 904 for fixing the spokes 2. The rim 900 and the disk 800 have a thickness of 3 mm and are concentrically arranged with respect to each other. The hook 901 is a loop made of a material that shrinks under pressure. One end of the hook 901 has its fixing portion 903 on the first side surface 906a of the rim 900, and the other end of the hook 901 has its fixing portion on the other side surface 906b of the rim 900. The loop-shaped hook 901 is fixed on the circumference of the rim 900 at the first pressing and bending portion to effectively catch on the outer teeth 801 of the disk 800. The hook 901 caught on the outer teeth 801 exerts a clutch effect between the rim 900 and the disk 800, enabling torque transmission from the chain drive wheel 6 to the rim 900 and thus to the wheel. When the driven wheel rotates faster than the chain drive wheel 6, the engagement disengages and the hook 901 slides off the outer teeth 801. To make the catching effect of the hook 901 on the outer teeth 801 better and more reliable, the side surface 802 of the outer teeth 801 on the side opposite to the rotation direction of the disk 800 is recessed, and the tip A' of the outer teeth 801 is offset toward the bottom 803 of the notch located on the side surface of the outer teeth 801 on the side opposite to the rotation direction of the disk 800.The rim 900 has a recess 906 for the hook 901 on its outer periphery. In the recess 906, the hook 901 is hidden in the disengaged state. The disc 800 has a pitch diameter exceeding 60 mm and less than 55% of the diameter of the rim 1 of the wheel.

[0048] (Example 4) As shown in FIG. 1, the rear wheel of the bicycle is composed of a tire rim 1 with spokes 2 and an axle 3 of the hub. The following components are rotatably attached to the axle 3 of the hub by ball bearings: a hub body 4 and a cassette 5 with a chain drive wheel 6. The wheel includes a one-way clutch assembly 74 shown in FIGS. 9 and 10, which is composed of a disk 800 having external teeth 801 and a rim 900 having a plurality of hooks 901 for engaging with the external teeth 801, and they are arranged coaxially. The hooks 901 are fixed to the inner circumference of the rim 900. The hooks 901 are arranged symmetrically with respect to the axle 3 of the hub. The disk 800 has an inner radius r' that defines a circle where the tip A' of the external teeth 801 is located, and this radius is smaller than the inner radius R' of the circle 902 on the rim 900 where the fixing portion 903 of the hook 901 is arranged. In this exemplary embodiment, the rim 900 is provided integrally with the largest chain drive wheel 6. On the other hand, the disk 800 is attached to the hub body 4 and has holes 804 for fixing the spokes 2. The rim 900 and the disk 800 have a thickness of 3 mm and are arranged concentrically with respect to each other. The hook 901 is a loop made of a material that shrinks under pressure. One end of the hook 901 has its fixing portion 903 on the first side surface 906a of the rim 900, and the other end of the hook 901 has its fixing portion on the other side surface 906b of the rim 900. The hook 901, which is a loop, is fixed on the circumference of the rim 900 at the first pressing and bending portion in order to effectively catch on the external teeth 801 of the disk 800. The hook 901 caught on the external teeth 801 exerts a clutch effect between the rim 900 and the disk 800, enabling the driving rotational force from the chain drive wheel 6 to be transmitted to the disk 800 and thus to the wheel. When the driven wheel rotates faster than the chain drive wheel 6, the engagement disengages and the hook 901 slides off the external teeth 801. To make the catching effect of the hook 901 on the external teeth 801 better and more reliable, the side surface 802 of the external teeth 801 on the side opposite to the rotation direction of the disk 800 is recessed, and the tip A' of the external teeth 801 is offset towards the bottom 803 of the notch located on the side surface of the external teeth 801 on the side opposite to the rotation direction of the disk 800. The rim 900 has a recess 905 for the hook 901 on its outer circumference.In the recess 905, the hook 901 is hidden in the disengaged state. The disk 800 has a pitch diameter exceeding 60 mm and less than 55% of the diameter of the rim 1 of the wheel.

[0049] (Example 5) As shown in FIG. 11, the wheel is manufactured in the same manner as in Example 2 above, except that the rim 8 of the one-way clutch assembly 72 is integrally provided with the flange 10 of the hub body 4. The spoke 2 is fixed to the flange 10.

[0050] (Example 6) As shown in FIG. 12, the wheel is manufactured in the same manner as in Example 4 above, except that the disk 800 of the one-way clutch assembly 74 is integrally provided with the flange 10 of the hub body 4. The spoke 2 is fixed to the flange 10.

[0051] (Example 7) This wheel is manufactured according to Examples 1 to 6 above, except that three loop-shaped hooks 91, 901 can catch one internal tooth 81 or external tooth 801 (FIG. 14). One end of each hook 91, 901 has its fixing part 93, 903 fixed to the first side surface 96a of the disk 9 or 906a of the rim 900, and the other end of each hook 91, 901 has its fixing part fixed to the other side surface 96b of the disk 9 or 906b of the rim 900. The hooks 91, 901 are attached at the same attachment location 93, 903. The hooks 91, 901 are first fixed at the pressing and bending part. The loop-shaped hooks 91, 901 have different lengths, and the difference in length between the outermost loop-shaped hooks 91, 901 is smaller than the distance between the tips A or A' of the adjacent teeth 81 or 801. The multiplexing of the hooks 91 or 901 enables the multiplexing of the capture points.

[0052] (Example 8) This wheel is manufactured according to the above-described Examples 1 to 6, except that two loop-shaped hooks 91 or 901 capture one internal tooth 81 or external tooth 801 as shown in FIG. 15. One of the hooks 91 or 901 has both ends attached to the first side surface 96a or 906a of the disk 9 or rim 900, and the other hook 91 or 901 has both ends attached to the other side surface 96b or 906b of the disk 9 or rim 900. The hooks 91 or 901 are attached at the same attachment location 93 or 903. The hooks 91 or 901 are formed such that their loops face the teeth 81 or 801 and intersect on the teeth 81 or 801 to form stable hooks.

Explanation of Signs

[0053] 1 Rim 2 Spoke 3 Axle of Hub 4 Hub Body 5 Cassette 6 Chain Drive Sprocket 71 One-Way Clutch Assembly Variant 1 72 One-Way Clutch Assembly Variant 2 73 One-Way Clutch Assembly Variant 3 74 One-Way Clutch Assembly Variant 4 8 Rim 82 Internal Tooth Side Surface 83 Bottom of Notch 84 Rim Hole for Spoke 9 Disk 91 Hook 92 Circle on Disk 93 Hook Fixing Portion 94 Hole in Disk for Spoke 95 Recess 96a First Side Surface of Disk 96b Other Side Surface of Disk 10 Flange 800 Disk 801 External Tooth 802 External Tooth Side Surface 803 Bottom of Notch Holes in the disc for 804 spokes 900 Rim 901 Hook 902 Circle on the rim 903 Hook fixing part 904 Holes in the rim for spokes 805 Recess 906a First side of the rim 907b Other side of the rim A Tip of the internal teeth A’ Tip of the external teeth R Radius of the inner ring defining the circle on the rim where the tip of the internal teeth is located R’ Inner radius of the circle of the rim to which the hook is attached r’ Radius defining the circle on the disc where the tip of the external teeth is located

Claims

**Claim 1** A rear wheel of a bicycle, comprising a tire rim having spokes, a hub shaft to which at least one chain drive wheel is rotatably attached, and a one-way clutch assembly, wherein the one-way clutch assembly (71, 72) includes a rim (8) having internal teeth (81), and the disk (9) having at least one hook (91) for engaging the internal teeth (81) fixed to the outer periphery of the disk (9) are coaxially arranged. The rim (8) has an inner radius (R) that defines a circle at which the tip (A) of the internal teeth (81) is located, and this radius is larger than the radius (r) of the circle (92) on the disk (9). At least one hook (91) and one of the elements of the one-way clutch assembly (71, 72) are fixed to the fixing portion (93) on this circle (92). The rim (8) or the disk (9) is combined with the chain drive wheel (6), and the spokes (2) are respectively attached to the disk (9) or the rim (8) which is the second element of the one-way clutch assembly (71, 72). A rear wheel of a bicycle, characterized in that. **Claim 2** The rear wheel of a bicycle according to claim 1, characterized in that the rim (8) has a thickness of 30 mm or less and is arranged concentrically with the disk (9). **Claim 3** The rear wheel of a bicycle according to claim 1 or 2, characterized in that the rim (8) and the disk (9) have a thickness of 9 mm or less and are arranged concentrically with each other. **Claim 4** The rear wheel of a bicycle according to any one of claims 1 to 3, characterized in that the disk (9) includes a plurality of hooks (91). **Claim 5** The rear wheel of a bicycle according to claim 4, characterized in that the hooks (91) are arranged symmetrically with respect to the axle (3) of the hub. **Claim 6** The rear wheel of a bicycle according to any one of claims 1 to 5, characterized in that the hook (91) is a loop. **Claim 7** The rear wheel of a bicycle according to any one of claims 1 to 6, characterized in that the hook (91) has a first pressing and bending portion for receiving the internal teeth (81) of the rim (8) and is fixed to the outer periphery of the disk (9). **Claim 8** The rear wheel of a bicycle according to any one of claims 1 to 7, characterized in that at least two hooks (91) are provided for engaging with one internal tooth (81) of the rim (8).

9. The rear wheel of a bicycle according to claim 8, characterized in that one end of the hook (91) has its fixing part (93) on the first side surface (96a) of the disc (9), and the other end of the hook (91) has its fixing part on the other side surface (96b) of the disc (9), and the hook (91) is fixed to the same mounting part (93).

10. The rear wheel of a bicycle according to claim 8, characterized in that both ends of at least one hook (91) are attached to the first side surface (96a) of the disc (9), both ends of at least one hook (91) are attached to the other side surface (96b) of the disc (9), the hook (91) is attached to the same mounting part (93), and the hook (91) has a shape with a loop facing the internal tooth (81) so as to be in a mirror image relationship with each other when attached to the first side surface and the second side surface (96a, 96b).

11. The rear wheel of a bicycle according to claim 8 or 9, characterized in that at least two hooks (91) are attached to the disc (9) at a first pressing and bending part, and the hooks (91) have different lengths, and the difference in the lengths of the outermost hooks (91) is smaller than the distance between consecutive tips (A) of the internal tooth (81).

12. The rear wheel of a bicycle according to any one of claims 1 to 11, characterized in that the disc (9) has recesses (95) for the hooks (91) on its circumference.

13. The rear wheel of a bicycle according to any one of claims 1 to 12, characterized in that the internal tooth (81) on the side opposite to the rotation direction of the rim (8) has a concave side surface (82), and / or the tip (A) of the internal tooth (81) is offset towards the bottom (83) of a notch located on the side of the internal tooth (81) opposite to the rotation direction of the rim (8), and has a convex side surface (82) on the side that coincides with the rotation direction of the rim (8).

14. The rear wheel of a bicycle according to any one of claims 1 to 13, characterized in that the rim (8) having the internal tooth (81) is provided integrally with the largest chain drive wheel (6).

15. The rear wheel of a bicycle according to any one of claims 1 to 14, characterized in that a pitch diameter of the rim (8) is 60 mm or more and 55% or less of a diameter of the rim (1) of the wheel.

16. The rear wheel of a bicycle according to any one of claims 1 to 15, characterized in that the disk (9) or the rim (8), which is a second element of the one-way clutch assembly (71, 72), is provided integrally with the flange (10) of the hub body (4), and the spoke (2) is attached to the flange (10).

17. A rear wheel of a bicycle, comprising a tire rim provided with spokes, a hub shaft to which at least one chain drive wheel is rotatably attached, and a one-way clutch assembly, wherein the one-way clutch assembly (73, 74) is configured such that a disk (800) having external teeth (801) and a rim (900) having at least one hook (901) for engaging with the external teeth (801) attached to an inner circumference of the rim (900) are coaxially arranged, the disk (800) has a radius (r') defining a circle at which a tip (A') of the external teeth (801) is located, and this radius is smaller than an inner radius (R') of a circle (902) on the rim (900), and at least one hook (901) and, further, one of elements of the one-way clutch assembly (73, 74) are fixed at a fixing portion (903) on the circle (902): the rim (900) or the disk (800) is provided integrally with the chain drive wheel (6), and the spokes (2) are respectively attached to the disk (800) or the rim (900) which is a second element of the one-way clutch assembly (73, 74).

18. The rear wheel of a bicycle according to claim 17, characterized in that the disk (800) has a thickness of 30 mm or less and is arranged concentrically with the rim (900).

19. The rear wheel of a bicycle according to claim 17 or 18, characterized in that the disk (800) and the rim (900) have a thickness of 9 mm or less and are arranged concentrically with each other.

20. The rear wheel of a bicycle according to any one of claims 17 to 19, characterized in that the rim (900) includes a plurality of hooks (901).

21. The rear wheel of a bicycle according to claim 20, characterized in that the hook (901) is arranged symmetrically with respect to the axle (3) of the hub.

22. The rear wheel of a bicycle according to any one of claims 17 to 21, characterized in that the hook (901) is a loop.

23. The rear wheel of a bicycle according to any one of claims 17 to 22, characterized in that the hook (901) is firmly fixed on the circumference of the rim (900) with a first pressing and bending part in order to effectively engage with the external teeth (801) of the disc (800).

24. The rear wheel of a bicycle according to any one of claims 17 to 23, characterized in that at least two hooks (901) are provided for engaging with one external tooth (801) of the disc (800).

25. The rear wheel of a bicycle according to claim 24, characterized in that one end of the hook (901) has its fixing part (903) on the first side surface (906a) of the rim (900), the other end of the hook (901) has its fixing part on the other side surface (906b) of the rim (900), and the hook (901) is fixed to the same mounting part (903).

26. The rear wheel of a bicycle according to claim 24, characterized in that both ends of at least one hook (901) are attached to the first side surface (906a) of the rim (900), both ends of at least one hook (901) are attached to the other side surface (906b) of the rim (900), the hook (901) is fixed to the same mounting part (903), and the hook (901) has a shape with a loop facing the external teeth (801) so as to be in a mirror image relationship with each other when attached to the first and second side surfaces (906a, 906b).

27. The rear wheel of a bicycle according to claim 24 or 25, characterized in that at least two hooks (901) are attached to the rim (900) with a first pressing and bending part, the hooks (901) have different lengths, and the difference in the lengths of the outermost hooks (901) is smaller than the distance between consecutive tops (A') of the external teeth (801).

28. The rear wheel of a bicycle according to any one of claims 17 to 27, characterized in that the rim (900) has a recess (905) for the hook (901) on its inner circumference.

29. The external teeth (801) on the side opposite to the rotation direction of the disk (800) have a concave side surface (802) and / or the tip (A') of the external teeth (801) is displaced toward the bottom (803) of the notch located on the side of the external teeth (801) opposite to the rotation direction of the disk (800), and on the side corresponding to the rotation direction of the disk (800), it has a convex side surface (802). The rear wheel of a bicycle according to any one of claims 17 to 28, characterized in that.

30. The rear wheel of a bicycle according to any one of claims 17 to 29, characterized in that the pitch diameter of the disk (800) is 60 mm or more and 55% or less of the diameter of the rim (1) of the wheel.

31. The disk (800) or the rim (900), which is the second element of the one-way clutch assembly (73, 74), is provided integrally with the flange (10) of the hub body (4), and the spoke (2) is fixed to the flange (10). The rear wheel of a bicycle according to any one of claims 17 to 30, characterized in that.

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