Abstract
The invention relates to a bicycle wheel made of a fiber composite material, including a rim, a plurality of spokes, and a center, wherein the spokes each have a first and second spoke section extending between the rim and the center, wherein the first and second rim section have a curved shape in a laminated state and the two rim sections extend straight in a pretensioned state.
Claims
1. A bicycle wheel made of a fiber composite material, comprising: a rim; a plurality of spokes; and a center, wherein the spokes each have a first spoke section and a second spoke section extending between the rim and the center, wherein, in a laminated state, the first spoke section and the second spoke section each have a curved shape, wherein, in a pretensioned state, the first spoke section and the second spoke section each extend substantially straight, wherein the first and the second spoke sections each form a crossing point with a further first and second spoke sections, wherein the crossing point is formed from individual layers of the spoke sections, the individual layers comprising at least four layers, and wherein, at the crossing point, the layers of the first spoke section are laminated alternatingly with the layers of the further first spoke section, so that an interweaving results at the crossing point.
2. The bicycle wheel according to claim 1, wherein the first and second spoke sections have an S-shape in the laminated state.
3. The bicycle wheel according to claim 2, wherein the S-shape has a symmetrical shape or an asymmetrical shape.
4. The bicycle wheel according to claim 1, wherein the spokes form a first spoke group and a second spoke group, first spoke sections of the second spoke group extend between first base points arranged on the rim on a non-brake disc side and on a non-brake disc side of the center, and second spoke sections of the second spoke group extend between the non-brake disc side of the center and second base points arranged on the rim on the non-brake disc side, and first spoke sections of the first spoke group extend between first base points arranged on the rim on a brake disc side and on a brake disc side of the center, and second spoke sections of the first spoke group extend between the brake disc side of the center and second base points arranged on the rim on the brake disc side.
5. The bicycle wheel according to claim 1, wherein the spokes form a first spoke group and a second spoke group, first spoke sections of the first spoke group extend between first base points arranged on the rim on a non-brake disc side and on a brake disc side of the center, and second spoke sections of the first spoke group extend between the brake disc side of the center and second base points arranged on the rim on the non-brake disc side, and first spoke sections of the second spoke group extend between first base points arranged on the rim on a brake disc side and on a non-brake disc side of the center, and second spoke sections of the second spoke group extend between the non-brake disc side of the center and second base points arranged on the rim on the brake disc side.
6. The bicycle wheel according to claim 5, wherein the first and second base points of the first spoke group and/or the first and second base points of the second spoke group are arranged at a distance to an apex of the rim.
7. The bicycle wheel according to claim 1, wherein the rim is not rotationally symmetrical with respect to an axis of rotation of the bicycle wheel.
8. The bicycle wheel according to claim 7, wherein the rim has a different rim cross-section in a region of first and second base points of the spokes of a first spoke group than in a region of first and second base points of the spokes of a second spoke group.
9. The bicycle wheel according to claim 5, wherein the spokes of the first spoke group form a spoke angle delta with a plane of symmetry of the bicycle wheel and the spokes of the second spoke group form a spoke angle epsilon with the plane of symmetry of the bicycle wheel, and wherein the spoke angle delta and the spoke angle epsilon are substantially equal.
10. The bicycle wheel according to claim 5, wherein the center has two opposed center discs, one center disc on the brake disc side and another center disc on the non-brake disc side, and wherein the center discs are inclined by an angle gamma to an axis w, the angle gamma having a value between 6 and 8.
11. The bicycle wheel according to claim 1, wherein the rim has an asymmetrical rim body, the rim body being formed as a hollow body.
12. The bicycle wheel according to claim 1, wherein the rim has a symmetrical rim body, the rim body being formed as a hollow body.
13. The bicycle wheel according to claim 5, wherein a distance from the first and second base points of the first spoke group to an apex of the rim is greater than a distance from the first and second base points of the second spoke group.
14. The bicycle wheel according to claim 5, wherein a distance from the first and second base points of the first spoke group to an apex of the rim is smaller than a distance from the first and second base points of the second spoke group.
15. The bicycle wheel according to any claim 5, wherein the first and second spoke sections of the first spoke group in the pretensioned state enclose at the first and second base points an insertion angle beta with an outer geometry of the rim measured at a tangent applied to the outer geometry of the rim at the first and second base points, the first and second spoke sections of the second spoke group in the pretensioned state enclose at the first and second base points an insertion angle alpha measured at a tangent line applied to the outer geometry of the rim at the first and second base points, and wherein the insertion angle alpha is greater than 90 and the insertion angle beta is greater than the insertion angle alpha, the insertion angle beta having a value between 120 and 180.
16. The bicycle wheel according to claim 9, wherein an angle alpha-prime is measured between a parallel plane to the plane of symmetry of the rim, which extends through the second base points, and the first spoke section, in the pretensioned state on the non-brake disc side and by an angle beta-prime measured between a parallel plane to the plane of symmetry of the rim, which extends through the first base points, and the first spoke section, in the pretensioned state on the brake disc side, wherein the angle alpha-prime and the angle beta-prime differ by a value less than or equal to 2, and the angle alpha-prime is larger than the angle beta-prime.
Description
BRIEF DESCRIPTION OF THE FIGURES
(1) The invention will be described hereinafter in greater detail in conjunction with drawings by means of exemplary embodiments.
(2) FIG. 1 shows a schematic view of one half of the rim cross-section, a first spoke section in a laminated state and in a pretensioned state, in a first embodiment,
(3) FIG. 2 shows a schematic view of one half of the rim cross-section, a first spoke section in a laminated state and in a pretensioned state, in a second embodiment,
(4) FIG. 3 shows a schematic view of the cross-section through the bicycle wheel in a laminated state (a), a state during pretensioning (b) and a pretensioned state (c),
(5) FIG. 4 shows a partially schematic sectional view of one half of the rim cross-section, a first and second spoke section, the first and second spoke group in a pretensioned state,
(6) FIG. 5 shows the view of FIG. 4 with the insertion angles (alpha) and (beta) of the first spoke sections of the first and second spoke group, in the pretensioned state, in a partially schematic sectional view,
(7) FIG. 6 shows the result of an FEM simulation of the pretensioning process of a spoke section, a comparison between a straight and curved laminated spoke section,
(8) FIG. 7 shows a schematic partial sectional view through the rim, wherein the integration of the spokes in the rim is shown,
(9) FIG. 8 shows a sectional view through a crossing point of spoke sections,
(10) FIG. 9 shows a perspective view of the inventive bicycle wheel,
(11) FIG. 10 shows an exploded view of a tool for the production of the inventive wheel,
(12) FIG. 11 shows a schematic vertical sectional view of a further embodiment of the bicycle wheel according to the invention, in particular the guiding of the first and second spoke sections,
(13) FIG. 12(a) shows the embodiment of FIG. 11 in a detailed view with asymmetrical rim and spoke course on the brake disc side of the bicycle wheel,
(14) FIG. 12(b) shows the embodiment of FIG. 11 in a detailed view with asymmetrical rim and spoke course on the non-brake disc side of the bicycle wheel,
(15) FIG. 13(a) shows a partial detail of FIG. 12(a) comprising a cross-section through the rim and a spoke section in the pretensioned state on the brake disc side,
(16) FIG. 13(b) shows a partial detail of FIG. 12(b) comprising a cross-section through the rim and a spoke section in the pretensioned state on the non-brake disc side,
(17) FIG. 14(a) shows the rims of FIG. 13(a) and FIG. 13(b) in a perspective view without spokes,
(18) FIG. 14(b) shows a first embodiment of a rim apex region,
(19) FIG. 14(c) shows a second embodiment of a rim apex region,
(20) FIG. 15 shows a schematic representation of the bicycle wheel in a view from above with a possible embodiment of the center discs, as they can be found on the brake disc side as well as the non-brake disc side of the bicycle wheel.
MODES OF IMPLEMENTING THE INVENTION
(21) When hereinafter a laminated state of the first and second spoke sections is mentioned, this is defined as the initial state of the spokes. In this initial state, the first and second spoke sections are not tensioned and are not yet applied with spoke pretensioning force.
(22) When hereinafter a pretensioned state of the first and second spoke sections is mentioned, this is defined as a final state of the spokes, in which the spokes are applied with a spoke pretensioning force, i.e. pretensioned. The subsequently used hub holds the spokes in the pretensioned state and therefore in the final state.
(23) In an exemplary embodiment, the spoke pretensioning force, which is applied during pretensioning to the first and second spoke sections, is approximately as large on the non-brake disc side as on the brake disc side of the bicycle wheel, preferably the difference between the two pretensioning forces is less than 200 N.
(24) In FIG. 1, a preferred embodiment of the geometry of the spoke 2, in particular the first spoke section 2.1 in the laminated state, is shown. The rim 1 comprises a symmetrical rim body 1 and a rim well 1. Here, FIG. 1 shows one half, comprising the first spoke section 2.1 of a first spoke group 20. The first spoke section 2.1 extends between a base point 4.1 and a center 3 of the bicycle wheel and is curved in the laminated state, before the spokes are pretensioned. In the embodiment shown, the curved shape is formed as a symmetrical S-shape, wherein this curve assumes the bending line of a bending beam of the simple beam theory. The line 2 represents the schematic course of a spoke known from the prior art, which in contrast to the inventive first and second spoke sections 2.1, 2.2 is laminated in a straight extending shape. As shown in FIG. 1, through the curved S-shape the spoke 2 in the region of the base point 4.1 already approaches the course of the pretensioned state 2 even in the laminated state, which leads to a smoothing of stress peaks in the region of the base plate 4.1 and at the entry point at the center 3. In a preferred embodiment, the spokes 2 are made from a UD (unidirectional) scrim of carbon fiber with a tension E-module of 130 GPa to 215 GPa.
(25) FIG. 2 shows the representation of FIG. 1, with the difference that in this embodiment, the curved form of the first spoke section 2.1 assumes an asymmetrical form, wherein the asymmetrical form is characterized in that half of the S-curve deviates from the bending line.
(26) In a further preferred embodiment (not shown in FIG. 2), the asymmetrical S-curve is characterized in that the point which separates the asymmetrical S-curve into a first and a second half is arranged closer to the rim than to the center of the bicycle wheel. The two halves of the S-curve are not equal and therefore asymmetric.
(27) FIG. 3 shows an example of the three steps (a) to (c) of the process of pretensioning. The image 3(a) shows a cross-section through the bicycle wheel in the laminated state. Here, the rim 1, the spokes 2 of the first and second spoke group 20, 200 comprising the first and second spoke sections 2.1, 2.2; 2.1, 2.2 and the center 3, having a first and second center disc 38, 38, are laminated in one step. The spoke sections are formed in a curved shape in the laminated state. FIG. 3(b) shows the process of pretensioning, the center 3, preferably consisting of two center discs 38, 38, is pulled in the horizontal direction, to approximately the size of the hub, wherein the spoke sections 2.1, 2.2, 2.1 and 2.2 are transferred from their curved shape in the laminated state into a substantially straight course in the pretensioned state. In the last step, as shown in FIG. 3(c), the hub to is inserted, which holds the spokes in the pretensioned state.
(28) FIG. 4 shows a cross-section through the rim 1, and a partial view of a first spoke section 2.1 of the first spoke group 20 and the first spoke section 2.1 of the second spoke group 200. The spokes 2 of the first spoke group 20 extend between the first base points 4.1 of a brake disc side of the center 3 and a second base point 4.2 (not shown in FIG. 4). The spokes of the second spoke group 200 extend between a first base point 4.1 of a non-brake disc side of the center 3 and a second base point 4.2 (not shown in FIG. 4). The base points are arranged on the rim body 1 of the rim 1. In this embodiment, the rim 1, in particular the rim body 1, is designed as a symmetrical body. In the embodiment according to FIG. 4, the distance X1 which the base point 4.1 takes from the plane of symmetry of the rim 1 is greater than the distance X2 which the base point 4.1 likewise takes from the plane of symmetry. In a preferred embodiment, the distance X2 is approximately half the distance X1 relative to the rim geometry shown.
(29) FIG. 5 shows the arrangement of FIG. 4, supplemented by the insertion angle (beta), which encompasses the first and second spoke section 2.1, 2.2 of the first spoke group 20, in the pretensioned state to the outer geometry of the rim 1 measured from base point 4.1 and 4.2 (not shown). Furthermore, the insertion angle (alpha) is shown, which encompasses the first and second spoke section 2.1, 2.2 of the second spoke group 200 in the pretensioned state, to the outer geometry of the rim 1, measured from first and second base points 4.1, 4.2. In the preferred embodiment shown in FIG. 5, the insertion angle (beta) is between and 180 with respect to the rim geometry shown. The insertion angle (alpha) has a value of greater than 90.
(30) Further represented in FIG. 5 is an angle (beta-prime) and an angle (alpha-prime). The angle (alpha-prime) is measured between a plane parallel to the plane of symmetry of the rim 1, which extends through the base point 4.1 and the first spoke section 2.1, in the pretensioned state on the non-brake disc side 31. The angle (beta-prime) is measured between a plane parallel to the plane of symmetry of the rim 1, which extends through the base point 4.1 and the first spoke section 2.1, in the pretensioned state on the brake disc side 30. The angles (alpha-prime) and (beta-prime) differ by a value less than or equal to 2, wherein (alpha-prime) is preferably greater than (beta-prime). This relationship between (alpha-prime) and (beta-prime) is independent of the chosen geometry of the rim 1.
(31) FIG. 6 shows the result of an FEM simulation of the pretensioning process, wherein a spoke section of a spoke 2 which has been laminated substantially straight is contrasted with a spoke section 2.1 of a spoke 2, which has been laminated curved. Observed are the stresses in the direction of the spokes. Both spoke sections, which was laminated straight and that which was laminated curved, were exposed to identical loading forces in the FEM simulation. In the results of the straight-laminated spoke section of the spoke 2, clear stress peaks emerge at the beginning and end of the spoke section (see the black-gray shaded areas). In comparison thereto, the originally curved-laminated spoke section 2.1 of the spoke 2 shows no stress peaks after pretensioning and a homogeneous stress curve.
(32) FIG. 7 shows a partial view of a cross-section through the rim 1, in the region in which the spokes 2 or the spoke section 2.1 is integrated. In the production of the bicycle wheel, the rim 1, the spokes 2 and the center 3 are laid in one step into an aluminum mold or steel mold. In a preferred embodiment, the spoke 2 is made of a unidirectional scrim of carbon fiber and the rim 1 is made from a fabric, preferably also of carbon fiber.
(33) In a further preferred embodiment, the spokes 2 and the rim 1 are made from a scrim, the spokes from a unidirectional scrim and the rim from a multidirectional scrim.
(34) The spoke 2 is constructed in multiple layers from the unidirectional scrim. Here, its fibers run continuously from a first base point over the center 3 of the bicycle wheel to a second base point 2 arranged on the rim body (not shown in FIG. 7). In the integration of the rim 2 in the rim body 1, the unidirectional scrim of the spoke 2 is attached on the inside of the rim body 1 by at least one, preferably a plurality, of layers of the fabric 11, from which the rim 1 is made. The number of layers 11 and their orientation may vary. An additional bonding of the spoke 2, for example at the base point 4.1, is not required.
(35) FIG. 8 shows a section through the crossing point 8, which extends for example through two first spoke sections 2.1, 2.3. Since the first spoke sections are symmetrical to the second spoke sections and form a spoke 2, the second spoke sections also have crossing points 8 (not shown in FIG. 8). As exemplified in FIG. 8, the first spoke section 2.1 and the further first spoke section 2.3 are constructed of a plurality of layers of a unidirectional scrim. The crossing point preferably comprises four layers 2.3.2, 2.3.2, 2.1.1, 2.1.2. In the preferred embodiment according to FIG. 8, the layers 2.1.1 and 2.1.2 of the first spoke portion 2.1 are alternatingly laminated with the layers 2.3.1 and 2.3.1 of the further first spoke section 2.3, so that an interweaving results at the crossing point 8. In FIG. 8, it is not immediately apparent that a thickening of the spoke cross-section results from the at least four layers.
(36) FIG. 9 shows a perspective view of the inventive bicycle wheel. Shown are the spokes of the first 20, the second spoke group 200 and the non-brake disc side 31 and the brake disc side 30 of the inventive bicycle wheel and the rim 1. A spoke is shown by way of example with reference characters, comprising a first and a second spoke section 2.1, 2.2, wherein this spoke extends continuously between the base points 4.1 and 4.2, which are arranged on the rim 1, and forms a spoke of the first spoke group 20.
(37) FIG. 10 shows a preferred embodiment of the inventive negative mold 9. The negative mold 9 comprises a first part 9.1 and a second part 9.2. In these two parts, the fibers for the rim body, the spokes, the center having a first and second center disc 38, 38 are laid into the corresponding recesses in one step. A further mold 15 forms the geometry of the rim well. Further shown are two punch forms 14 and 13. In the assembled state, the negative mold 9 act in a form-fitting manner with the punch forms 13 and 14 with recesses for the spokes. In this way, a desired spoke cross-section is formed.
(38) FIG. 11 schematically shows a further embodiment of the inventive bicycle wheel in a vertical sectional view. The strongly simplified illustration of the rim 16 may have a symmetrical or asymmetrical rim body. In the preferred embodiment shown in FIG. 21, the spokes form a first and a second spoke group 21, 22. The spokes 19 of the first and second spoke group 21, 22 have first and second spoke sections 29, 32, 34, 36. As shown in FIG. 11, the first spoke section 29 of the first spoke group 21 extends between the first base point 23 arranged on the rim 16 on a non-brake disc side 28 as well as a brake disc side 24 of the center 25 and the second spoke section 32 extends between the brake disc side 24 of the center 25 and second base points 26 arranged on the rim 16 on the non-brake disc side. The first spoke sections 34 of the spokes 19 of the second spoke group 22 extend between first base points 33 arranged on the rim 16 on the brake disc side and the non-brake disc side 28 of the center 25. The second spoke sections 36 extend between the non-brake disc side 28 of the center and second base points 37 arranged on the rim on the brake disc side. In the embodiment shown in FIG. 11, the spoke sections are straight. The spokes are pretensioned. The center 25 has two opposing center discs, one on the brake disc side 24 and one on the non-brake disc side 28 (not shown in FIG. 11).
(39) In FIG. 12(a), the schematic representation of FIG. 11 is shown in more detail using the example of a rim 160 having an asymmetrical rim body, which is not symmetrical with respect to a vertical plane of symmetry X. A cross-section is shown. Using the example of a spoke comprising a first and a second spoke section 29, 32, the course of the spoke of the first spoke group 21 is shown. The plane X represents the vertical plane of symmetry and the horizontal axis D is the rotational axis of the bicycle wheel. In the embodiment shown, the first and second spoke sections 29, 32 are shown in the pretensioned state. The hub 10 is inserted in the center 25. The center 25 is formed by two opposing center discs 38, 38. The hub 10 is used to keep the spokes in the pretensioned, final state. The bicycle wheel has a brake side disc side 24 and a non-brake side disc 28. The first spoke section 29 extends between the first base point 23, the point at which the spoke section 29 is embedded in the rim 160 and the center disc 38 on the brake disc side 24. The base point 23 is oriented toward the non-brake disc side 28. The second spoke section 32 extends between the center disc 38 on the brake disc side 24 and the second base point 26, which is oriented toward the non-brake disc side 28. The second spoke section is embedded in the rim 160 at this base point 26.
(40) In FIG. 12(b), the schematic representation of FIG. 11 is shown in more detail using the example of a rim 160 having an asymmetrical rim body, which is not symmetrical with respect to a vertical plane of symmetry X. Using the example of a spoke comprising a first and a second spoke section 34, 36, the course of the spoke of the second spoke group 22 is shown. The plane X represents the vertical plane of symmetry and the horizontal axis D is the rotational axis of the bicycle wheel. In the embodiment shown, the first and second spoke sections 34, 36 are shown in the pretensioned state. The hub 10 is inserted in the center 25. The center 25 is formed by two opposing center discs 38, 38. The hub to is used to keep the spokes in the pretensioned, final state. The bicycle wheel has a brake side disc side 24 and a non-brake side disc 28. The first spoke section 34 extends between the first base point 33, the point at which the spoke section 34 is embedded in the rim 160 and the center 25 formed as a center disc 38 on the non-brake disc side 28. The base point 33 is oriented toward the brake disc side 24. The second spoke section 36 extends between the center disc 38 on the non-brake disc side 28 and the second base point 37, which is oriented toward the brake disc side 24. The second spoke section 36 is embedded in the rim 160 at this base point 37.
(41) FIG. 13(a) shows a cross-sectional view of a detail of FIG. 12(a) with the rim 160 having an asymmetrical rim body. X is the plane of symmetry of the bicycle wheel. Shown is a portion of the second spoke section 32, which extends on the brake disc side 24 and is connected at the second base point 26 with the rim 160. Also shown in FIG. 13(a) is a spoke angle delta, which encloses the spokes of the first spoke group to the plane of symmetry of the bicycle wheel, in the pretensioned state. The second spoke section 32 in the pretensioned state is shown to represent the spokes of the first spoke group.
(42) FIG. 13(b) shows a cross-sectional view of a detail of FIG. 12(b) with the rim 160 having an asymmetrical rim body. X is the plane of symmetry of the bicycle wheel. Shown is a portion of the second spoke section 36, which extends on the non-brake disc side 28 and is connected at the second base point 37 with the rim 160. Also shown in FIG. 13(b) is a spoke angle epsilon, which encloses the spokes of the second spoke group to the plane of symmetry of the bicycle wheel, in the pretensioned state. The second spoke section 36 in the pretensioned state is shown to represent the spokes of the first spoke group.
(43) The base points 26 and 27 are formed in a rounded manner, in particular in the transition of the spokes to the rim.
(44) From the comparison of the two rim cross-sections 160A and 160B, it can be seen that the rim cross-section has a different cross section in the region of the base point 26 from which the first spoke sections 32 of the first spoke group 21 emerge than the rim cross-section in the region of the base point 37 from which the first spoke sections 32 of the second spoke group emerge.
(45) The spoke angles delta and epsilon are approximately the same size, so that an approximately equal pretensioning force is present on the brake disc side and the non-brake disc side.
(46) FIG. 14(a) shows a partial representation of the rim 160 of FIG. 13(a), FIG. 13(b) in a perspective view. Furthermore, it is at least partially apparent from FIG. 14(a) that rim 160 is not rotationally symmetrical, i.e. designed to be rotationally asymmetrical in relation to rotation axis D. The asymmetry is achieved by means of a variation of the rim cross-section. For a better visualization, two intersections A and B are shown in the regions of base points 26 and base points 37, in order to visualize the differing cross-sections 160A and 160B. Both cross-sections represent an asymmetrical rim body, i.e. both rim bodies are asymmetrical in relation to symmetry plain X of the bicycle wheel. The rotation asymmetry of the rim in relation to rotation axis D is achieved by means of a displacement of apex S towards apex S in the direction of the Z-axis. As particularly apparent from the embodiment according to FIG. 14(a) rim apex region 161 does not run in circular manner but in waved manner with apexes running in flat or oblique manner.
(47) In the embodiment shown in FIG. 14(a), the apex S, S of the cross section 160A varies from the cross-section 160B with respect to a displacement in the direction of the Z axis.
(48) FIG. 14(b) shows a possible course of a rim apex region 161A comprising apexes 163, 164 running in flat or oblique manner. The two broken lines represent the two rim baselines 162. As in conventional rims, they run in circular manner (along the outer periphery of the rim).
(49) The apexes 163 with flat courses run in parallel manner to rim baselines 162. The apexes 164 are, viewed in the direction of movement of the bicycle wheel, at defined angles, in relation to rim baselines 162, i.e. they run in oblique manner in relation to these.
(50) FIG. 14(c) shows an alternative embodiment of a course of a rim apex region 161B. The shown arrow indicates the direction of movement of the bicycle wheel. According to this embodiment the apex region may, instead of being flat (running in parallel to the rim baselines), run obliquely in relation to the rim baselines in the direction of movement of the wheel, e.g. at an acute angle in the direction of movement of the wheel, wherein the declining flank of the apex purposely declines in a more acute manner.
(51) FIG. 15 shows a schematic representation of the bicycle wheel in a view from above in an arbitrary three-dimensional coordinate system (u, v, w), wherein with reference to this illustration, a possible embodiment of the center disc 39, 39 is explained. As shown schematically, the spoke sections 34, 36, 29, 32 are connected with the center disc 39, 39, wherein the center disc is inclined at an angle gamma () to an axis w. This inclination angle is preferably between 6 and 8. The center disc and the rim do not lie in the same plane.
LIST OF REFERENCE CHARACTERS
(52) 1 rim 1 symmetrical rim body 1 a rim well 2 spoke(s) 2 spoke(s) (comparative spoke according to the prior art) 2 spoke course in the pretensioned state 30 brake disc side 20 first spoke group (brake disc side) 2.1, 2.3 first spoke section (brake disc side) 2.2 second spoke section (brake disc side) 4.1 first base point(s) (brake disc side) 4.2 second base point(s) (brake disc side) ![custom character]()
insertion angle (brake disc side) ![custom character]()
angle (brake disc side) 31 non-brake disc side 200 second spoke group (non-brake disc side) 2.1 first spoke section (non-brake disc side) 2.2 second spoke section (non-brake disc side) 4.1 base point(s) (non-brake disc side) 4.2 base point(s) (non-brake disc side) insertion angle (non-brake disc side) angle (non-brake disc side) 10 hub 3 one center 8 crossing point 2.3.1, 2.3.2, 2.1.1, 2.1.2 fabric layers 9 negative mold 9.1 first part negative mold 9.2 second part negative mold 15 mold 13, 14 punch form 16, 160 rim 17, 170 rim body 18 rim well 21 first spoke group 19 spokes 22 second spoke group 29 first spoke sections (first spoke group) 32 second spoke sections 32 (first spoke group) 23 first base points (first spoke group) 26 second base points (second spoke group) 28 non-brake disc side 24 brake disc side 25 center 34 first spoke sections (second spoke group) 36 second spoke sections (second spoke group) 33 first base points (second spoke group) 37 second base points (second spoke group) X vertical plane of symmetry of the bicycle wheel D axis of rotation 38, 38 center discs 39, 39 spoke surface of extent 160A, 160B rim cross-section
