TW202222636A - Bicycle cassette - Google Patents

Abstract

A bicycle cassette is configured to be mounted on recesses of a hub. The bicycle cassette includes a plurality of sprocket assemblies and a gasket. The sprocket assemblies are configured to be mounted on the hub, and the sprocket assemblies are arranged side by side. The gasket is configured to be mounted on the hub. The gasket is located between two of the sprocket assemblies. Each of the sprocket assemblies and the gasket has a plurality of teeth. The quantity of the teeth of each of the sprocket assemblies and the gasket is configured to be fewer than the quantity of the recesses of the hub. The teeth of each of the sprocket assemblies and the gasket are configured to be engaged with parts of the recesses of the hub, and the teeth of at least two of the sprocket assemblies and the gasket are not entirely aligned with each other.

Description

bicycle rear flywheel

The present invention relates to a rear flywheel, especially a bicycle rear flywheel.

In recent years, the bicycle market has developed vigorously. Whether it is a high-end competition bicycle or a popular bicycle as a means of transportation and leisure entertainment, it is loved by consumers, prompting manufacturers to pay more attention to the needs of users for bicycle functions. The body material and equipment functions are continuously improved and refined.

Taking the rear flywheel of a bicycle as an example, most of the rear flywheels on the market are divided into multiple sprocket assemblies which are assembled on the hub respectively. Specifically, these sprocket assemblies and the hub are combined through the engaging structure, and the number of engaging structures provided by each sprocket assembly and the hub is matched, but such a configuration causes the chain to pass through the rear flywheel. When driving the hub to rotate, all the engaging structures of the hub are subjected to the stress exerted by all the engaging structures of each sprocket assembly, which may easily cause damage to the engaging structures of the hub over time. Therefore, researchers in this field are currently working on solving such problems.

The present invention is to provide a bicycle rear flywheel, so as to solve the problem of easy damage of the engaging structure of the wheel hub described in the prior art.

An embodiment of the present invention discloses a bicycle rear flywheel, which is used for being installed in a plurality of tooth slots of a hub, and includes a plurality of sprocket assemblies and a washer. The sprocket assemblies are installed on the hub, and the sprocket assemblies are arranged side by side. The washer is installed on the wheel hub and is located between the two sprocket assemblies. These sprocket assemblies and washers each have a plurality of internal spline teeth. The number of the internal spline teeth of each sprocket assembly and the number of the internal spline teeth of the washer is used to be less than the number of the tooth slots. The internal spline teeth of each sprocket assembly and washer are used to engage only a portion of the tooth slots. The internal spline teeth of at least two of the sprocket assemblies and the washers partially overlap and partially do not overlap in the direction of the center axis of the hub.

Another embodiment of the present invention discloses a bicycle rear flywheel, which is installed in a plurality of tooth slots of a hub, and includes a plurality of sprocket assemblies. These sprocket assemblies are arranged side by side. Each of these sprocket assemblies has a plurality of internal spline teeth. The number of internal spline teeth of each sprocket assembly is used to be less than the number of these tooth slots. The internal spline teeth of each sprocket assembly are used to engage only a portion of these tooth slots. The internal spline teeth of at least two of the sprocket assemblies partially overlap and partially do not overlap in the direction of the center axis of the hub.

According to the bicycle rear flywheel disclosed in the above-mentioned embodiments, the number of the internal spline teeth of each sprocket assembly is smaller than the number of the tooth slots, and the internal spline teeth of at least two of the sprocket assemblies are on the hub The configuration of partially overlapping and partially non-overlapping in the direction of the central axis can avoid all the external spline teeth meshing with the same tooth slot, and achieve the effect of stress dispersion on the hub from the external spline teeth, so as to avoid the hub. The tooth space is damaged.

The above description of the content of the present invention and the description of the following embodiments are used to demonstrate and explain the principle of the present invention, and provide further explanation of the scope of the patent application of the present invention.

Please refer to Figure 1 and Figure 2. 1 is a schematic perspective view of a bicycle rear flywheel and a wheel hub according to a first embodiment of the present invention. FIG. 2 is an exploded schematic view of FIG. 1 .

In this embodiment, the bicycle rear flywheel 10 is used to be installed in a plurality of tooth slots 3 of an assembly column portion 2 of the wheel hub 1 . The bicycle rear flywheel 10 includes a plurality of sprocket assemblies 100 , 200 , 300 and a washer 400 . The sprocket assemblies 100 , 200 and 300 include, for example, a first sprocket assembly 100 , a second sprocket assembly 200 and a third sprocket assembly 300 . The second sprocket assembly 200 and the washer 400 are located between the first sprocket assembly 100 and the third sprocket assembly 300 , and the washer 400 is located between the first sprocket assembly 100 and the second sprocket assembly 200 . In this embodiment, the maximum outer diameter of the second sprocket assembly 200 is smaller than the maximum outer diameter of the first sprocket assembly 100 and larger than the maximum outer diameter of the third sprocket assembly 300 , which will be described in detail below.

Next, please refer to FIG. 3 , which is an exploded schematic view of the first sprocket assembly and the washer of FIG. 2 . FIG. 4 is a perspective view of the second sprocket and the first sprocket assembly seat of the first sprocket assembly of FIG. 3 .

The first sprocket assembly 100 includes a first sprocket assembly seat 110 , a first sprocket 120 , a second sprocket 130 , a third sprocket 140 , a fourth sprocket 150 , and a fifth sprocket 160 , a spacer 170 and a plurality of joints 181 , 182 , 183 , and the first sprocket assembly 100 has a plurality of sprocket assembly holes 191 , 192 , 193 .

The first sprocket assembly seat 110 includes a central portion 111 and a plurality of connecting portions 112 . These connecting portions 112 are connected to the central portion 111 and extend in the radial direction of the central portion 111 . The second sprocket 130 is integrally connected to one end of the connecting portions 112 away from the central portion 111 .

In this embodiment, the connecting portions 112 of the first sprocket assembly seat 110 are stepped structures. One of the connection parts 112 will be described below. The connecting portion 112 has a first surface 1121 , a second surface 1122 and a third surface 1123 . The second sprocket 130 has a first surface 132 and a second surface 133 opposite to each other. The first surface 1121 , the second surface 1122 , the third surface 1123 of the connecting portion 112 and the first surface 132 of the second sprocket 130 all face the washer 400 . The first surface 1121 of the connecting portion 112 is coplanar with the first surface 132 of the second sprocket 130 . The first surface 1121 and the second surface 1122 of the connecting portion 112 are located between the first surface 132 of the second sprocket 130 and the third surface 1123 of the connecting portion 112 . The second surface 1122 of the connecting portion 112 is located between the first surface 1121 and the third surface 1123 , and the third surface 1123 is closer to the central portion 111 than the second surface 1122 and the first surface 1121 . The central portion 111 has an outer surface 1111 facing the gasket 400 . Please refer to FIG. 15 first, a distance D1 is maintained between the third surface 1123 of the connecting portion 112 and the outer surface 1111 of the gasket 400 , and a distance D2 is maintained between the second surface 1122 of the connecting portion 112 and the outer surface 1111 of the gasket 400 , A distance D3 is maintained between the first surface 1121 of the connecting portion 112 and the outer surface 1111 of the gasket 400 . The pitch D1 is greater than the pitch D2, and the pitch D2 is greater than the pitch D3.

Different parts of each sprocket assembly hole 191 are respectively formed on the first surface 1121 of one of the connecting portions 112 and the first surface 132 of the second sprocket 130 . That is, the sprocket assembly holes 191 are located where the connecting portions 112 are connected to the second sprocket 130 . A portion of each sprocket assembly hole 191 is farther from the center point C of the center portion 111 than an inner surface 134 of the second sprocket 130 facing the center portion 111 . The sprocket assembly holes 192 are respectively formed on the second surfaces 1122 of the connecting portions 112 , and the sprocket assembly holes 193 are formed on the third surfaces 1123 of the connecting portions 112 .

In this embodiment, the second sprocket 130 further has an annular flange 135 protruding from the second surface 133 , and the sprocket assembly holes 191 penetrate through the annular flange 135 . These coupling parts 181, 182, 183 are, for example, riveting parts. The coupling elements 181 are passed through the first sprocket 120 and are respectively fixed to the sprocket assembling holes 191 , and the second surface 133 of the second sprocket 130 faces the first sprocket 120 . The first sprocket 120 abuts the annular flange 135 at a distance from the second surface 133 of the second sprocket 130 .

The third sprockets 140 are stacked on the second surfaces 1122 of the connecting portions 112 , so that the second sprockets 130 are located between the first sprockets 120 and the third sprockets 140 . The coupling members 182 are passed through the third sprocket 140 and are respectively fixed to the sprocket assembly holes 192 . The fourth sprocket 150 is stacked on the third surfaces 1123 of the connecting portions 112 , so that the third sprocket 140 is located between the fourth sprocket 150 and the second sprocket 130 . The spacer 170 is stacked on the side of the fourth sprocket 150 away from the second surface 1122 of the connecting parts 112 , and the fifth sprocket 160 is stacked on the side of the spacer 170 away from the fourth sprocket 150 , so that the fourth The sprocket 150 is located between the third sprocket 140 and the spacer 170 , and the spacer 170 is located between the fourth sprocket 150 and the fifth sprocket 160 . The coupling members 183 are penetrated through the fifth sprocket 160 , the partition member 170 and the fourth sprocket 150 , and are respectively fixed to the sprocket assembling holes 193 .

In this embodiment, the outer diameter of the second sprocket 130 is smaller than the outer diameter of the first sprocket 120 and larger than the outer diameter of the third sprocket 140 , and the outer diameter of the fourth sprocket 150 is smaller than that of the third sprocket 140 The outer diameter is larger than the outer diameter of the fifth sprocket 160 . In addition, the first sprocket 120 has, for example, 33 teeth 121 , the second sprocket 130 has, for example, 28 teeth 131 , the third sprocket 140 has, for example, 24 teeth 141 , and the fourth sprocket 150 has, for example, 21 teeth 141 . The tooth portion 151 and the fifth sprocket 160 have, for example, 19 tooth portions 161 . The teeth 121 , 131 , 141 , 151 , 161 are used to engage with a bicycle chain (not shown).

In this embodiment, the central portion 111 of the first sprocket assembly seat 110 also has a through hole 1112 and a plurality of internal spline teeth 1113 . These internal spline teeth 1113 protrude from the inner annular surface 1114 of the through hole 1112 . The through holes 1112 are used for passing through the assembling column portion 2 of the hub 1 , and these internal spline teeth 1113 are used for engaging with the tooth slots 3 of the assembling column portion 2 of the wheel hub 1 . The number of the internal spline teeth 1113 of the first sprocket assembly seat 110 is smaller than the number of the tooth slots 3 of the hub 1 . The number of the internal spline teeth 1113 of the first sprocket assembly seat 110 is, for example, nine. Among the internal spline teeth 1113 of the first sprocket assembly seat 110 , one of the internal spline teeth 1113 a has a shape different from that of the other internal spline teeth 1113 b. Correspondingly, among the tooth slots 3 of the assembly column portion 2 of the hub 1 , the shape of one tooth slot 3 a is different from that of the other tooth slots 3 b. The internal spline teeth 1113a of the first sprocket assembly seat 110 are used to match the tooth slots 3a of the assembly column portion 2 of the hub 1 , and the internal spline teeth 1113b of the first sprocket assembly seat 110 are used to match the hub 1 . The tooth slot 3b of the column part 2 is assembled.

Next, please refer to FIG. 5 , which is an exploded schematic view of the first sprocket assembly and the washer of FIG. 2 .

The washer 400 has a through hole 410 and a plurality of internal spline teeth 420 . The inner spline teeth 420 protrude from the inner annular surface 430 of the through hole 410 . The through holes 410 are used for passing through the assembling column portion 2 of the hub 1 , and these internal spline teeth 420 are used for engaging with the tooth slots 3 of the assembling column portion 2 . The number of the internal spline teeth 420 of the washer 400 is smaller than the number of the tooth slots 3 of the hub 1 . The number of the internal spline teeth 420 of the washer 400 is, for example, nine. Among the internal spline teeth 420 of the washer 400, one of the internal spline teeth 420a has a shape different from that of the other internal spline teeth 420b. The internal spline teeth 420a of the washer 400 are used for matching with the tooth grooves 3a of the wheel hub 1 , and the internal spline teeth 420b of the washer 400 are used for matching with the tooth grooves 3b of the wheel hub 1 . The washer 400 is stacked on the side of the fifth sprocket 160 away from the spacer 170 , and the inner spline teeth 420 a of the washer 400 are aligned with the inner spline teeth 1113 a of the first sprocket assembly seat 110 , and the inner spline teeth of the washer 400 are The teeth 420b are misaligned with the internal spline teeth 1113b of the first sprocket assembly seat 110 .

Next, please refer to FIGS. 6 to 8 . FIG. 6 is an exploded schematic view of the second sprocket assembly and the washer of FIG. 2 . FIG. 7 is a perspective view of the second sprocket assembly seat, the ninth sprocket and the tenth sprocket of the second sprocket assembly of FIG. 6 . FIG. 8 is an exploded schematic view of FIG. 6 from another viewing angle.

The second sprocket assembly 200 includes a second sprocket assembly seat 210 , a sixth sprocket 220 , a seventh sprocket 230 , an eighth sprocket 240 , a ninth sprocket 250 , and a tenth sprocket 260 and two separators 270 and 280. The sixth sprocket 220 , the seventh sprocket 230 and the eighth sprocket 240 are mounted on the second sprocket assembly base 210 , and the ninth sprocket 250 and the tenth sprocket 260 are integrally connected to the second sprocket assembly base 210. The sixth sprocket 220 , the seventh sprocket 230 , the eighth sprocket 240 , the ninth sprocket 250 and the tenth sprocket 260 are arranged between the washer 400 and the third sprocket assembly 300 in order from large to small outer diameters. and the sixth sprocket 220 is closer to the washer 400 than the seventh sprocket 230 , the eighth sprocket 240 , the ninth sprocket 250 and the tenth sprocket 260 , and the outer diameter of the sixth sprocket 220 is smaller than that of the fifth sprocket 160 outer diameter. The partition 270 is located between the sixth sprocket 220 and the seventh sprocket 230 , and the partition 280 is located between the seventh sprocket 230 and the eighth sprocket 240 .

Specifically, the second sprocket assembly seat 210 has a through hole 211 , a first inner annular surface 212 , a second inner annular surface 213 , a first outer annular surface 214 , a second outer annular surface 215 , a plurality of Positioning bumps 216 and an annular flange 217 . The through hole 211 has a narrow portion 2111 and a wide portion 2112 which are communicated with each other. The first inner annular surface 212 forms a narrow portion 2111 , and the second inner annular surface 213 forms a wide portion 2112 . The inner diameter of the narrow portion 2111 is smaller than the inner diameter of the wide portion 2112 . The first outer annular surface 214 faces away from the first inner annular surface 212 , and the second outer annular surface 215 faces away from the second inner annular surface 213 . The positioning projections 216 and the annular flange 217 both protrude from the first outer annular surface 214 , and the positioning projections 216 are located on the same side of the annular flange 217 . The annular flange 217 has a plurality of locking holes 2171 . Each of the sixth sprocket 220 , the seventh sprocket 230 , the eighth sprocket 240 and the two partitions 270 and 280 has a plurality of positioning grooves 222 , 232 , 242 , 272 and 282 . In addition, the bicycle rear flywheel 10 also includes a plurality of screw locks 500 .

In this embodiment, the washer 400 , the sixth sprocket 220 , the seventh sprocket 230 , the eighth sprocket 240 , and the two spacers 270 and 280 are fixed to the second sprocket assembly seat 210 . The washer 400 , the sixth sprocket 220 , the seventh sprocket 230 , the eighth sprocket 240 , and the two spacers 270 , 280 are assembled to the second sprocket assembly seat 210 by sequentially assembling the eighth sprocket 240 , the spacer 280 , the seventh sprocket 230 , the spacer 270 and the positioning grooves 242 , 282 , 232 , 272 , 222 of the sixth sprocket 220 are assembled on the positioning projection 216 , and then the washer 400 is pressed against the sixth sprocket 220 and away from One side of the spacer 270, then these screw locks 500 are passed through the washer 400, the sixth sprocket 220, the seventh sprocket 230, the eighth sprocket 240 and the second spacers 270, 280 and locked to these locks respectively Hole 2171. In this way, the sixth sprocket 220 , the seventh sprocket 230 , the eighth sprocket 240 and the two spacers 270 , 280 are clamped between the washer 400 and the annular flange 217 to complete the washer 400 and the sixth chain Assembly of the wheel 220 , the seventh sprocket 230 , the eighth sprocket 240 and the two spacers 270 and 280 .

The ninth sprocket 250 and the tenth sprocket 260 are respectively integrally connected to the second outer ring surface 215 of the second sprocket assembly seat 210 . The annular flange 217 is located between the ninth sprocket 250 and the eighth sprocket 240 , and the tenth sprocket 260 is located on the side of the ninth sprocket 250 away from the eighth sprocket 240 and maintains a gap with the ninth sprocket 250 .

In this embodiment, the outer diameter of the seventh sprocket 230 is smaller than the outer diameter of the sixth sprocket 220 and larger than the outer diameter of the eighth sprocket 240 , and the outer diameter of the ninth sprocket 250 is smaller than that of the eighth sprocket 240 The outer diameter is larger than the outer diameter of the tenth sprocket 260 . In addition, the sixth sprocket 220 has, for example, 17 teeth 221 , the seventh sprocket 230 has, for example, 15 teeth 231 , the eighth sprocket 240 has, for example, 14 teeth 241 , and the ninth sprocket 250 has, for example, 13 teeth 241 . The tooth portion 251 and the tenth sprocket 260 have, for example, 12 tooth portions 261 . The teeth 221, 231, 241, 251, 261 are used for engaging with a bicycle chain (not shown).

In this embodiment, the second sprocket assembly seat 210 further has a plurality of internal spline teeth 218 protruding from the first inner annular surface 212 thereof. The through holes 211 of the second sprocket assembly seat 210 are used for passing through the assembly column portion 2 of the wheel hub 1 , and the internal spline teeth 218 are used to engage with the tooth slots 3 of the assembly column portion 2 of the wheel hub 1 . The number of the internal spline teeth 218 of the second sprocket assembly seat 210 is smaller than the number of the tooth slots 3 of the assembly column portion 2 of the hub 1 . The number of internal spline teeth 218 of the second sprocket assembly seat 210 is, for example, nine. Among the internal spline teeth 218 of the second sprocket assembly seat 210 , one of the internal spline teeth 218 a has a shape different from that of the other internal spline teeth 218 b. In this embodiment, two opposite sides of the washer 400 abut between the fifth sprocket 160 and the sixth sprocket 220 . The inner spline teeth 218a, 218b of the second sprocket assembly seat 210 are aligned with the inner spline teeth 420a, 420b of the washer 400, respectively. The internal spline teeth 218 a of the second sprocket assembly seat 210 are used to match the tooth slots 3 a of the hub 1 , and the internal spline teeth 218 b of the second sprocket assembly seat 210 are used to match the tooth grooves 3 b of the wheel hub 1 .

Next, please refer to FIG. 9 and FIG. 10 . FIG. 9 is an exploded schematic view of the second sprocket assembly and the third sprocket assembly of FIG. 2 . FIG. 10 is an exploded schematic view of FIG. 9 from another viewing angle.

The third sprocket assembly 300 includes a third sprocket assembly base 310 , an eleventh sprocket 320 and a twelfth sprocket 330 . The third sprocket assembly seat 310 has a through hole 311 , a first inner annular surface 312 , a second inner annular surface 313 , a first outer annular surface 314 , a second outer annular surface 315 and a plurality of positioning protrusions 316 . The through hole 311 has a wide portion 3111 and a narrow portion 3112 which are communicated with each other. The first inner annular surface 312 forms a wide portion 3111 , and the second inner annular surface 313 forms a narrow portion 3112 . The inner diameter of the wide portion 3111 is larger than the inner diameter of the narrow portion 3112 . The first outer annular surface 314 faces away from the first inner annular surface 312 , and the second outer annular surface 315 faces away from the second inner annular surface 313 . The positioning protrusions 316 protrude from the first outer ring surface 314 . The eleventh sprocket 320 and the twelfth sprocket 330 are respectively integrally connected to the first outer ring surface 314 and the second outer ring surface 315 of the third sprocket assembly base 310 . The eleventh sprocket 320 is located between the positioning protrusions 316 and the twelfth sprocket 330 , and a gap is maintained between the eleventh sprocket 320 and the twelfth sprocket 330 .

In this embodiment, the second sprocket assembly base 210 further has a plurality of positioning protrusions 2191 protruding from the second inner annular surface 213 , and a positioning groove 2192 is formed between each two positioning protrusions 2191 . In addition, a stop surface 2113 is formed between the narrow part 2111 and the wide part 2112 of the through hole 211 of the second sprocket assembly seat 210 . The positioning protrusions 316 of the third sprocket assembly seat 310 are assembled to the positioning grooves 2192 of the second sprocket assembly seat 210 , and the third sprocket assembly seat 310 abuts against the stop surface 2113 , so that the eleventh sprocket The 320 is located between the tenth sprocket 260 and the twelfth sprocket 330 , and the eleventh sprocket 320 and the tenth sprocket 260 maintain a gap. In this embodiment, the outer diameter of the eleventh sprocket 320 is smaller than that of the tenth sprocket 260 and larger than the outer diameter of the twelfth sprocket 330 . In addition, the eleventh sprocket 320 has, for example, 11 teeth 321 , and the twelfth sprocket 330 has, for example, ten teeth 331 .

In this embodiment, the third sprocket assembly seat 310 has a plurality of internal spline teeth 317 protruding from the first inner annular surface 312 thereof. The through holes 311 of the third sprocket assembly seat 310 are used for inserting the assembly column portion 2 of the wheel hub 1 , and these internal spline teeth 317 are used to engage with the tooth slots 3 of the wheel hub 1 . The number of the internal spline teeth 317 of the third sprocket assembly seat 310 is smaller than the number of the tooth slots 3 of the hub 1 . The number of the internal spline teeth 317 of the third sprocket assembly seat 310 is, for example, nine. Among the internal spline teeth 317 of the third sprocket assembly seat 310 , the shape of one of the internal spline teeth 317 a is different from that of the other internal spline teeth 317 b. The inner spline teeth 317a, 317b of the third sprocket assembly seat 310 are aligned with the inner spline teeth 218a, 218b of the second sprocket assembly seat 210, respectively. The internal spline teeth 317 a of the third sprocket assembly seat 310 are used to match the tooth slots 3 a of the hub 1 , and the internal spline teeth 317 b of the third sprocket assembly seat 310 are used to match the tooth grooves 3 b of the wheel hub 1 .

In this embodiment, the bicycle rear flywheel 10 further includes an assembly cover 600 . The assembly cover 600 has an outer surface 610 , an outer thread 620 and a flange 630 . The outer thread 620 is formed on the outer surface 610 and is used for screwing with the inner thread 4 in the assembling column portion 2 of the wheel hub 1 . The flange 630 of the assembly cover 600 protrudes from the outer surface 610 for abutting against the third sprocket assembly seat 310 .

Next, the process of assembling the bicycle rear flywheel 10 to the hub 1 will be described below. Please refer to FIGS. 11 to 15 . FIGS. 11 to 13 are schematic diagrams of the assembly of the bicycle rear flywheel of FIG. 1 . FIG. 14 is an enlarged schematic view of FIG. 13 . FIG. 15 is a schematic cross-sectional view of FIG. 1 . In order to clearly show the tooth slots 3a of the hub 1, the hub 1 in Figs. 11 to 14 is shown in a dotted pattern.

First, the first sprocket 120 , the third sprocket 140 , the fourth sprocket 150 , the spacer 170 and the fifth sprocket 160 are assembled to the first sprocket assembly seat 110 to complete the assembly of the first sprocket assembly 100 , and assemble the eighth sprocket 240 , the spacer 280 , the seventh sprocket 230 , the spacer 270 , the sixth sprocket 220 and the washer 400 to the second sprocket assembly seat 210 , and assemble the second sprocket assembly 200 with The gasket 400 is assembled in one piece.

Next, as shown in FIG. 11 , the internal spline teeth 1113 a of the first sprocket assembly seat 110 are aligned and inserted into the tooth slots 3 a of the hub 1 . At the same time, the other internal spline teeth 1113b are also inserted into the tooth slots 3b of the hub 1 respectively.

Next, as shown in FIG. 12 , the internal spline teeth 218 a of the second sprocket assembly seat 210 and the internal spline teeth 420 a of the washer 400 are aligned and inserted into the tooth slots 3 a of the hub 1 . At the same time, the other internal spline teeth 218b and 420b are also inserted into the tooth slots 3b of the hub 1, respectively.

Next, as shown in FIGS. 13 and 14 , the internal spline teeth 317 a of the third sprocket assembly seat 310 are aligned and inserted into the tooth slots 3 a of the hub 1 . At the same time, the other internal spline teeth 317b are also inserted into the tooth slots 3b of the hub 1 respectively, and the positioning protrusions 316 of the third sprocket assembly seat 310 are assembled in the positioning grooves 2192 of the second sprocket assembly seat 210 (eg shown in Figure 9).

Next, as shown in FIG. 15 , the assembly cover 600 is inserted into the through hole 311 of the third sprocket assembly seat 310 , and the outer thread 620 of the assembly cover 600 is screwed into the inner thread 4 in the assembly column portion 2 of the hub 1 , so that The first sprocket assembly seat 110 , the washer 400 , the second sprocket assembly seat 210 and the third sprocket assembly seat 310 are sandwiched between the flange 630 of the assembly cover 600 and an annular flange of the assembly column portion 2 of the hub 1 between 5.

As shown in FIGS. 11 to 14 , since the internal spline teeth 1113 a , 420 a , 218 a , 317 a of the first sprocket assembly seat 110 , the washer 400 , the second sprocket assembly seat 210 and the third sprocket assembly seat 310 are all Since these internal spline teeth 1113a, 420a, 218a, and 317a are meshed with the same tooth slots 3a, they overlap in the direction of the center axis A of the hub 1 . As for the other internal spline teeth 1113b, 420b, 218b, 317b of the first sprocket assembly seat 110, the washer 400, the second sprocket assembly seat 210 and the third sprocket assembly seat 310, the washer 400, the second sprocket assembly seat 210 and the other internal spline teeth 420b, 218b, 317b of the third sprocket assembly seat 310 overlap in the direction of the center axis A of the hub 1, but do not overlap other internal spline teeth of the first sprocket assembly seat 110 1113b. That is to say, the inner spline teeth 218 , 317 , 420 of the second sprocket assembly 200 , the third sprocket assembly 300 and the washer 400 completely overlap in the direction of the center axis A of the hub 1 , and the first sprocket assembly 100 The internal spline teeth 1113 of the wheel hub 1 partially overlap in the direction of the central axis A of the hub 1 and partially do not overlap the internal spline teeth 218 , 317 , 420 of the second sprocket assembly 200 , the third sprocket assembly 300 and the washer 400 . In this way, all the external spline teeth 1113, 218, 317, 420 can be prevented from being engaged with the same tooth slot 3, so as to achieve the effect of dispersing the stress exerted by the external spline teeth 1113, 218, 317, 420 on the hub 1 , so as to avoid damage to the tooth slot 3 of the hub 1.

In this embodiment, the internal spline teeth 218 , 317 , 420 of the second sprocket assembly 200 , the third sprocket assembly 300 and the washer 400 are completely aligned, and the internal spline teeth 1113 of the first sprocket assembly 100 are not completely aligned The internal spline teeth 218 , 317 and 420 of the second sprocket assembly 200 , the third sprocket assembly 300 and the washer 400 are aligned, but not limited thereto. In other embodiments, the internal spline teeth of the first sprocket assembly, the second sprocket assembly and the third sprocket assembly may be completely aligned, and the internal spline teeth of the washer may not be completely aligned with the first sprocket assembly, the third spline assembly Internal spline teeth of the second sprocket assembly and the third sprocket assembly. Alternatively, the internal spline teeth of the first sprocket assembly, the third sprocket assembly and the washer may be completely aligned, and the internal spline teeth of the second sprocket assembly may not be completely aligned with the first sprocket assembly and the third sprocket assembly. and the internal spline teeth of the washer. Alternatively, the internal spline teeth of the first sprocket assembly, the second sprocket assembly and the washer may be completely aligned, and the internal spline teeth of the third sprocket assembly may not be completely aligned with the first sprocket assembly and the second spline. Internal spline teeth of components and washers.

In another embodiment, the internal spline teeth of any three of the first sprocket assembly, the washer, the second sprocket assembly, and the third sprocket assembly may not be perfectly aligned with each other, while the internal spline teeth of the other one Can be perfectly aligned with one of the foregoing. For example, the internal spline teeth of the first sprocket assembly are not fully aligned with the internal spline teeth of the washer, the internal spline teeth of the washer are not fully aligned with the internal spline teeth of the second sprocket assembly, the second sprocket The internal spline teeth of the assembly are not fully aligned with the internal spline teeth of the first sprocket assembly, while the internal spline teeth of the third sprocket assembly are fully aligned among the first sprocket assembly, the washer and the second sprocket assembly One of the internal spline teeth.

In yet another embodiment, the internal spline teeth of four of the first sprocket assembly, the washer, the second sprocket assembly, and the third sprocket assembly may not be perfectly aligned with each other. That is, the internal spline teeth of the first sprocket assembly are not completely aligned with the internal spline teeth of the washer, the second sprocket assembly, and the third sprocket assembly, and the internal spline teeth of the washer are not completely aligned with the second chain The internal spline teeth of the wheel assembly and the third sprocket assembly, the internal spline teeth of the second sprocket assembly are not completely aligned with the internal spline teeth of the third sprocket assembly.

In this embodiment, the shapes of the internal spline teeth 1113a, 218a, 317a, 420a of the first sprocket assembly seat 110, the washer 400, the second sprocket assembly seat 210 and the third sprocket assembly seat 310 are different from those of The shapes of the internal spline teeth 1113b, 218b, 317b, 420b of the first sprocket assembly seat 110, the washer 400, the second sprocket assembly seat 210 and the third sprocket assembly seat 310 can be found in the first sprocket assembly seat 110 , the washer 400 , the second sprocket assembly seat 210 and the third sprocket assembly seat 310 are assembled on the hub 1 to provide a foolproof mechanism to avoid the first sprocket assembly seat 110 , the washer 400 , the second sprocket The assembly seat 210 and the third sprocket assembly seat 310 are assembled with the inner spline teeth 1113b, 218b, 317b, 420b in the tooth slot 3a of the hub 1, and can ensure the first sprocket assembly seat 110, the washer 400, the second sprocket The assembly seat 210 and the third sprocket assembly seat 310 are installed on the hub 1 at a desired angle. However, the shapes of the internal spline teeth 1113 , 218 , 317 and 420 of the first sprocket assembly seat 110 , the washer 400 , the second sprocket assembly seat 210 and the third sprocket assembly seat 310 are not intended to limit the present invention. In other embodiments, the shapes of the internal spline teeth of the first sprocket assembly seat, the washer, the second sprocket assembly seat, and the third sprocket assembly seat may all be the same.

On the other hand, the first sprocket 120 , the second sprocket 130 , the third sprocket 140 , the fourth sprocket 150 and the fifth sprocket 160 are connected to the same sprocket assembly base 110 , the washer 400 , the sixth The sprocket 220 , the seventh sprocket 230 , the eighth sprocket 240 , the ninth sprocket 250 and the tenth sprocket 260 are jointly connected to the same sprocket assembly base 210 , the eleventh sprocket 320 and the twelfth sprocket The wheels 330 are connected to the same sprocket assembly base 310 in common, and the bicycle rear flywheel 10 can have a lighter weight than a rear flywheel in which each sprocket is connected to a sprocket assembly base.

In addition, the first sprocket assembly seat 110 has sprocket assembly holes 191 , 192 , 193 , and the portion of each sprocket assembly hole 191 is farther from the center portion 111 than the inner surface 134 of the second sprocket 130 facing the center portion 111 . The configuration of the center point C of the first sprocket assembly seat 110 can respectively fix a sprocket with a larger outer diameter (the first sprocket 120 ) and a sprocket with a smaller outer diameter (the third chain 140 , the fourth sprocket 150 and the fifth sprocket 160 ), so that the sprocket with a larger outer diameter is located on one side of the second sprocket 130 , and the sprocket with a smaller outer diameter is located on the other side of the second sprocket 130 side.

In this embodiment, the sprocket assembly seat with a stepped structure (eg, the first sprocket assembly seat 110 ) is used for the sprocket assembly with the largest outer diameter (eg, the first sprocket assembly 100 ), but it is not limited. In other embodiments, the sprocket assembly seat with the stepped structure can be applied to other sprocket assemblies, such as the sprocket assembly with the second largest outer diameter.

The numbers of the internal spline teeth of the first sprocket assembly base 110 , the washer 400 , the second sprocket assembly base 210 and the third sprocket assembly base 310 in this embodiment are all nine, but not limited thereto. In other embodiments, the numbers of the internal spline teeth of the first sprocket assembly seat, the washer, the second sprocket assembly seat and the third sprocket assembly seat may all be less than nine.

According to the bicycle rear flywheel disclosed in the above-mentioned embodiments, the number of the internal spline teeth of each sprocket assembly is smaller than the number of the tooth slots, and the internal spline teeth of at least two of the sprocket assemblies are on the hub The configuration of partially overlapping and partially non-overlapping in the direction of the central axis can avoid all the external spline teeth meshing with the same tooth slot, and achieve the effect of stress dispersion on the hub from the external spline teeth, so as to avoid the hub. The tooth space is damaged.

Although the present invention is disclosed by the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the similar arts can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of patent protection of the invention shall be determined by the scope of the patent application attached to this specification.

1: Wheel hub 2: Assemble the column 3, 3a, 3b: Cogging 4: Internal thread 5: Annular flange 10: Bike rear flywheel 100: First sprocket assembly 110: The first sprocket assembly seat 111: Central Department 1111: External Surface 1112: Perforation 1113, 1113a, 1113b: Internal spline teeth 1114: inner ring surface 112: Connection part 1121: First Surface 1122: Second Surface 1123: Third Surface 120: First sprocket 130: Second sprocket 132: First Surface 133: Second Surface 134: inner surface 135: annular flange 140: Third sprocket 150: Fourth sprocket 160: Fifth sprocket 121, 131, 141, 151, 161: teeth 170: Dividers 181, 182, 183: binding pieces 191, 192, 193: sprocket assembly holes 200: Second sprocket assembly 210: Second sprocket assembly seat 211: Perforation 2111: Narrow part 2112: Wide part 2113: Stop Surface 212: First inner ring surface 213: Second inner ring surface 214: The first outer ring surface 215: Second outer ring surface 216: Positioning bump 217: annular flange 2171: Keyhole 218, 218a, 218b: Internal spline teeth 2191: Positioning bumps 2192: Positioning groove 220: Sixth sprocket 230: Seventh sprocket 240: Eighth sprocket 250: Ninth sprocket 260: Tenth sprocket 270, 280: Separator 221, 231, 241, 251, 261: teeth 222, 232, 242, 272, 282: Positioning grooves 300: Third sprocket assembly 310: Third sprocket assembly seat 311: Perforation 3111: Wide part 3112: Narrow part 312: First inner ring surface 313: Second inner ring surface 314: First outer ring surface 315: Second outer ring surface 316: Positioning bump 317, 317a, 317b: Internal spline teeth 320: Eleventh sprocket 330: Twelfth sprocket 321, 331: teeth 400: Washer 410: Perforation 420, 420a, 420b: Internal spline teeth 430: inner ring surface 500: Screw lock 600: Assemble the cover 610: External surface 620: External thread 630: Flange D1, D2, D3: Spacing C: center point A: axis

1 is a schematic perspective view of a bicycle rear flywheel and a wheel hub according to a first embodiment of the present invention. FIG. 2 is an exploded schematic view of FIG. 1 . FIG. 3 is an exploded schematic view of the first sprocket assembly of FIG. 2 . FIG. 4 is a perspective view of the second sprocket and the first sprocket assembly seat of the first sprocket assembly of FIG. 3 . FIG. 5 is an exploded schematic view of the first sprocket assembly and the washer of FIG. 2 . FIG. 6 is an exploded schematic view of the second sprocket assembly and the washer of FIG. 2 . FIG. 7 is a perspective view of the second sprocket assembly seat, the ninth sprocket and the tenth sprocket of the second sprocket assembly of FIG. 6 . FIG. 8 is an exploded schematic view of FIG. 6 from another viewing angle. FIG. 9 is an exploded schematic view of the second sprocket assembly and the third sprocket assembly of FIG. 2 . FIG. 10 is an exploded schematic view of FIG. 9 from another viewing angle. 11 to 13 are schematic diagrams of assembly of the bicycle rear flywheel of FIG. 1 . FIG. 14 is an enlarged schematic view of FIG. 13 . FIG. 15 is a schematic cross-sectional view of FIG. 1 .

1: Wheel hub

2: Assemble the column

3, 3a, 3b: Cogging

4: Internal thread

5: Annular flange

100: First sprocket assembly

110: The first sprocket assembly seat

120: First sprocket

130: Second sprocket

140: Third sprocket

150: Fourth sprocket

160: Fifth sprocket

200: Second sprocket assembly

210: Second sprocket assembly seat

220: Sixth sprocket

230: Seventh sprocket

240: Eighth sprocket

250: Ninth sprocket

260: Tenth sprocket

300: Third sprocket assembly

310: Third sprocket assembly seat

320: Eleventh sprocket

330: Twelfth sprocket

400: Washer

500: Screw lock

600: Assemble the cover

610: External surface

620: External thread

630: Flange

Claims (16)

A bicycle rear flywheel is used to be installed in a plurality of tooth slots of a hub, comprising: a plurality of sprocket assemblies to be installed on the hub, and the sprocket assemblies are arranged side by side; and a washer for Installed on the hub, and located between two of the sprocket assemblies; wherein, the sprocket assemblies and the washer each have a plurality of internal spline teeth, and the internal spline teeth of each of the sprocket assemblies are The number and the number of the internal spline teeth of the washer are used to be less than the number of the tooth grooves, each of the sprocket assembly and the internal spline teeth of the washer are used to only engage part of the tooth grooves, The internal spline teeth of at least two of the sprocket assemblies and the washer are partially overlapped and partially non-overlapping in the direction of the center axis of the hub. The bicycle rear flywheel as claimed in claim 1, wherein the number of the internal spline teeth of each sprocket assembly and the number of the internal spline teeth of the washer are both less than or equal to nine. The bicycle rear flywheel of claim 1, wherein the sprocket assemblies comprise a first sprocket assembly, a second sprocket assembly and a third sprocket assembly, the second sprocket assembly and the washer are located in the between the first sprocket assembly and the third sprocket assembly, the washer is located between the first sprocket assembly and the second sprocket assembly, and the maximum outer diameter of the second sprocket assembly is smaller than the first chain The largest outer diameter of the wheel assembly is greater than the largest outer diameter of the third sprocket assembly. The bicycle rear flywheel as claimed in claim 3, wherein the second sprocket assembly, the third sprocket assembly and the inner spline teeth of the washer completely overlap in the direction of the center axis of the hub, and the first spline assembly The internal spline teeth of a sprocket assembly partially overlap in the direction of the central axis of the hub and partially do not overlap the internal spline teeth of the second sprocket assembly, the third sprocket assembly and the washer . The bicycle rear flywheel as claimed in claim 4, wherein the shapes of the inner spline teeth that overlap in the direction of the center axis of the hub are different from those of the inner splines that do not overlap in the direction of the center axis of the hub The shape of the spline teeth. The bicycle rear flywheel as claimed in claim 3, wherein the first sprocket assembly comprises a first sprocket assembly seat, a first sprocket, a second sprocket, a third sprocket, and a fourth sprocket and a fifth sprocket, the first sprocket assembly base includes a central portion and a plurality of connecting portions, the inner spline teeth of the first sprocket assembly are located in the central portion, and the connecting portions are connected to the central portion and extending along the radial direction of the central portion, the second sprocket is integrally connected to one end of the connecting portions away from the central portion, the first sprocket, the third sprocket, and the fourth sprocket and the fifth sprocket is fixed on the connecting parts, the second sprocket is located between the first sprocket and the third sprocket, the fourth sprocket is located between the third sprocket and the fifth sprocket In between, the outer diameter of the second sprocket is smaller than the outer diameter of the first sprocket and larger than the outer diameter of the third sprocket, and the outer diameter of the fourth sprocket is smaller than the outer diameter of the third sprocket and larger than the outer diameter of the fifth sprocket. The bicycle rear flywheel as claimed in claim 6, wherein the first sprocket assembly further comprises a plurality of coupling parts, and the first sprocket assembly has a plurality of sprocket assembly holes, the sprocket assembly holes are formed in the The connecting portion and the place where the connecting portions are connected with the second sprocket, the portion of each sprocket assembling hole located at the place where the connecting portions are connected with the second sprocket faces the center than the second sprocket An inner surface of the part is away from the center point of the central part, and the coupling parts are passed through the first sprocket, the third sprocket, the fourth sprocket and the fifth sprocket and are respectively fixed to the chains Wheel assembly holes. The bicycle rear flywheel as claimed in claim 7, wherein the central portion has an outer surface facing the washer, the second sprocket has two opposite surfaces, and each of the connecting portions has a first surface, a second surface Surfaces and a third surface, the first surfaces are coplanar with one of the surfaces of the second sprocket, the first surfaces, the second surfaces, the third surfaces and the outer surface face the same direction , the second surfaces are respectively located between the third surfaces and the first surfaces, the third surfaces are respectively closer to the central portion than the second surfaces and the first surfaces, the third surfaces The distance with the outer surface is smaller than the distance between the second surfaces and the outer surface and the distance between the first surfaces and the outer surface, the distance between the second surfaces and the outer surface The distance between the first surfaces and the outer surface is smaller than the distance between the first surfaces and the outer surface, the sprocket assembly holes are located on the first surfaces, the second surfaces and the third surfaces, and the other The surface faces the first sprocket, the third sprocket abuts the second surfaces, and the fourth sprocket abuts the third surfaces and is located between the fifth sprocket and the third surface. The bicycle rear flywheel of claim 6, wherein the first sprocket assembly includes a spacer located between the fourth sprocket and the fifth sprocket. The bicycle rear flywheel as claimed in claim 6, wherein the second sprocket assembly comprises a second sprocket assembly seat, a sixth sprocket, a seventh sprocket, an eighth sprocket, and a ninth sprocket And a tenth sprocket, the inner spline teeth of the second sprocket assembly are located in the second sprocket assembly seat, the sixth sprocket, the seventh sprocket and the eighth sprocket are mounted on the The second sprocket assembly base, the ninth sprocket and the tenth sprocket are integrally connected to the second sprocket assembly base, the sixth sprocket, the seventh sprocket, the eighth sprocket, the The ninth sprocket and the tenth sprocket are arranged between the washer and the third sprocket assembly in order from large to small outer diameter, and the sixth sprocket is larger than the seventh sprocket and the eighth sprocket. , The ninth sprocket and the tenth sprocket are close to the washer, and the outer diameter of the sixth sprocket is smaller than the outer diameter of the fifth sprocket. The bicycle rear flywheel as claimed in claim 10, wherein the sixth sprocket, the seventh sprocket and the eighth sprocket are fixed to the second sprocket assembly seat by means of screw locks. The bicycle rear flywheel as claimed in claim 10, wherein the sixth sprocket, the seventh sprocket and the eighth sprocket are mounted on the second sprocket assembly seat through a concave-convex matching structure. The bicycle rear flywheel as claimed in claim 10, wherein the second sprocket assembly further comprises two partitions, wherein one partition is located between the sixth sprocket and the seventh sprocket, and the other partition is located between the sixth sprocket and the seventh sprocket. between the seventh sprocket and the eighth sprocket. The bicycle rear flywheel as claimed in claim 10, wherein the third sprocket assembly comprises a third sprocket assembly seat, an eleventh sprocket and a twelfth sprocket, and the inner part of the third sprocket assembly comprises a The spline teeth are located at the third sprocket assembly seat, the eleventh sprocket and the twelfth sprocket are integrally connected to the third sprocket assembly seat, and the outer diameter of the eleventh sprocket is smaller than the The tenth sprocket is larger than the outer diameter of the twelfth sprocket. The bicycle rear flywheel as claimed in claim 14, wherein the third sprocket assembly seat is assembled to the second sprocket assembly seat through a concave-convex matching structure. A bicycle rear flywheel is used to be installed in a plurality of tooth slots of a hub, comprising: a plurality of sprocket assemblies, the sprocket assemblies are arranged side by side, each of the sprocket assemblies has a plurality of internal spline teeth, each The number of the internal spline teeth of a sprocket assembly is used to be smaller than the number of the tooth slots, and the internal spline teeth of each sprocket assembly are used to only engage part of the tooth slots; wherein the The internal spline teeth of at least two of the sprocket assemblies partially overlap and partially overlap in the direction of the center axis of the hub.

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