WO2019223420A1

WO2019223420A1 - Protective device

Info

Publication number: WO2019223420A1
Application number: PCT/CN2019/079950
Authority: WO
Inventors: 黄跃波
Original assignee: Huang Yuebo
Priority date: 2018-05-23
Filing date: 2019-03-27
Publication date: 2019-11-28

Abstract

Disclosed is a protective device, comprising: a box-shaped base (01, 08) by which at least an upper portion of a freewheel is covered and a lower portion thereof is open, the base (01, 08) being integrally manufactured with or fixedly connected to a rear portion of a bicycle frame (19); and a guide rail (20), which is located in a range from the front to the underneath of the freewheel and is substantially parallel to the contour line of the freewheel or which is located in a range from the front underneath to the underneath of the freewheel and is substantially parallel to the axis of the freewheel, the guide rail (20) being fixedly connected inside the base (01, 08). The protective device is used for a guide-rail-type rear derailleur of a bicycle speed change device and solves the problem that the guide-rail-type rear derailleur and the protective cover cannot be used together. The problem of the universality of the guide-rail-type rear derailleur and the protective cover is also solved.

Description

Protective device

Technical field

The invention relates to a bicycle shifting device, in particular to a bicycle rear shifting device.

Background technique

Bicycle chain drive systems place strong demands on the installation of guards. An example is that almost all single-speed bicycles are equipped with various chain covers, chain guards and the like. However, the problem of protecting the rear dial / flywheel transmission system has not been solved well. For this reason, the industry has invented various transmission / variation systems with lower protection requirements such as hub speed, center speed, belt transmission, and shaft transmission to circumvent this problem. However, these transmission / speed transmission systems cannot be replaced for their own reasons. The dial / flywheel transmission system has become mainstream.

Patent CN103442977A shows a dual-rail bicycle rear dial, whose rails are exposed, which can not avoid the harmful factors such as dust, splashing water, etc .; compared with the common parallel link rear dial, the rear rail dial is more effective for the working environment. There are higher requirements-because the adhesion of foreign substances on the surface of the guide rail will cause the friction of the guide rail to increase and cause failure; dirt and rust will also increase the maintenance workload of the guide rail.

The shield of the prior art isolates the guide rail from the frame, making it difficult to install the existing rail-type rear dial directly to the frame: the best connection point between the guide rail and the frame is the point where the frame is closest to the outer end of the guide rail. It is difficult to install the base at this point due to the hindrance of the cover. For example, an opening is provided at the corresponding position of the existing shield, so that the rail-type rear dial can extend into the shield through the opening. On the one hand, this will reduce the sealing of the shroud. On the other hand, since the rail-type rear dial has multiple specifications, a specific rail-type rear dial can only match a specific shield for it. The lack of universality between the two will lead to: 1.1 . Chain cover manufacturers need to produce multiple specifications of chain covers in order to match different types of rail-type rear dials on the market, which makes the production organization more complicated and increases manufacturing costs. 1.2. A variety of chain covers also increase the complexity of the seller's stocking and increase the cost of circulation. 1.3. Due to the lack of versatility, consumers will also increase the cost of replacing and repairing the chain cover.

In the patent CN103442977A, a short arm is provided between the shifting leg and the sliding member (10). The resultant force received by the legs is converted into a torque acting on the guide rail through the short arm. Therefore, the guide rail needs to be designed to be strong enough to resist the torque, and the weight of the guide rail will increase accordingly. However, in the bicycle industry, where weight loss is regarded as life, weight reduction is of special significance.

Summary of the Invention

The main object of the present invention is to provide a protective device for a rail-type rear dial.

A main object of the present invention is to solve the problem that it is difficult to share the shield and the rail-type rear dial.

A main object of the present invention is to solve the problem of universality of the rail type rear dial and the shield.

To this end, the protective device includes: a base, the base is box-shaped; the base covers at least the upper part of the flywheel; the lower part of the base is open; the base is integrally manufactured or fixedly connected with the rear of the frame; N rails , 5≥N≥1; when N> 1, the guide rails are parallel to each other; the guide rails are located in the range from front to the bottom of the flywheel and are substantially parallel to the contour line of the flywheel; The guide rail is fixedly connected in the base.

The invention pioneers the design of the integrated structure of the base and the protective cover in the industry, so that the guide rail can be fixedly connected to the base at an optimal position, thus solving the problem that the rail type rear dial and the protective cover are difficult to share; and The universality problem of the rail-type rear dial and the shield is fundamentally solved. The base also has a shield function, which also effectively improves the reliability of the rear dial and reduces its maintenance workload; it can also reduce the wind resistance of the rear dial and the flywheel (fairing). The shroud base can also be used as part of a full chain cover solution, and other parts to form a complete chain cover. Compared with the existing rear dial + existing shield solution, the design of the multifunctional base of the present invention can effectively reduce the number of parts and reduce the manufacturing cost. However, in order to achieve the above-mentioned object of the invention, the inventors also need to consider the limited installation space and accurate installation positioning requirements. The application on a soft tail frame is best to have a quick disassembly function, to facilitate the maintenance of internal mechanisms, and other Partial combination into bicycles and other unique constraints and requirements, which greatly increases the difficulty of invention.

Compared with the dual-rail solution of the background invention, under the same conditions, when N = 1, the weight of a single rail is lighter.

The invention also includes a moving part; the moving part can be reciprocally connected to the guide rail.

A preferred solution of the moving part is: the moving part includes a slider, and the slider has a slide; the guide rail passes through the slide so that the slider can be connected to the guide rail reciprocally; or the moving part includes a pulley, a roller mechanism or a roller mechanism It is supported on the guide rail so that the carriage can reciprocate along the guide rail.

The motion pair consisting of the slider and the guide rail has the advantages of simple structure, stable and reliable movement.

In order to manipulate the moving part, the present invention includes: an actuating part, the actuating part is connected to the moving part, so as to manipulate the moving part to move along the guide rail.

A preferred solution of the actuating part is that the actuating part includes a unidirectional force mechanism and a pull wire; the unidirectional force mechanism can apply a unidirectional force to the moving part and is connected to the moving part; In the mobile department.

In order to drive the chain displacement to achieve variable speed. The protective device further includes a chain guide portion; the chain guide portion is synchronously connected to the moving portion to drive the chain from the initial gear of the flywheel to the target gear of the flywheel.

A preferred solution of the chain guide part is that the chain guide part includes a guide wheel a, a connecting body a and a tension wheel a; the guide wheel a is pivotally connected to the moving part; the connecting body a has an upper end a and a lower end a; and the upper end a is deflected The pivot is connected to the moving part; the tension wheel a is pivoted to the lower end a.

This solution can eliminate the short arm structure of the moving part in the background invention, make the stress condition of the guide rail better, and lay a foundation for weight reduction and reliability improvement.

Another preferred solution of the chain guide part is that the chain guide part includes a guide wheel b, a connecting body b, and a tension wheel b; the connecting body b has an upper end portion b and a lower end portion b; the guide wheel b is pivotally connected to the upper end portion b; and an upper end portion b is pivoted at the moving part; tension wheel b is pivoted at the lower end b.

Another preferred solution of the chain guide part is that the guide rail is located in a front-to-bottom to lower range of the flywheel and is substantially parallel to the flywheel axis; the chain guide part includes a guide wheel c, a bracket and a tension wheel c; the bracket includes a short arm a and a short arm b; The deflected pivot at the joint of the short arm a and the short arm b is connected to the moving part; the guide wheel c is pivotally connected to the end of the short arm a; the tension wheel c is pivotally connected to the end of the short arm b; the axis of the guide wheel c to the pivot Distance Z from the rotation axis; distance Y from the c-axis of the tension wheel to the pivot axis, 1.3Z≤Y≤2.5Z; the plane where the c-axis of the guide wheel and the pivot axis are located, and the plane between the c-axis of the tension wheel and the pivot axis The included angle is α, 50 ° ≤α≤85 °; the guide rail is located in front of and below the flywheel and is substantially parallel to the flywheel axis; the distance between the pivot axis and the flywheel axis is X, and the distance between the flywheel axis and the d-axis of the center plate is W, 6 % W≤X≤16% W.

A secondary object of the present invention is to enhance the sealing of the base.

To this end, the present invention also includes a dust cover; the dust cover is flexible; the dust cover is fixedly connected to the lower portion of the base to form a substantially closed space with the base to at least the upper part of the guide chain portion Cover it.

The rear dial has different angles in different gears, which is a difficult point to protect the rear dial. The solution of the rigid shield and the flexible dust cover solves this problem very well.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an external view of a protective device of Example 1. FIG.

Fig. 2 is an exploded view of the protective device of the first embodiment.

FIG. 3 is a detailed exploded view of the protective device of Embodiment 1. FIG.

FIG. 4 is a schematic diagram of the installation of the base of Embodiment 1. FIG.

FIG. 5 is a schematic diagram of a scheme in which a guide rail is provided directly below a flywheel in Embodiment 1. FIG.

FIG. 6 is a schematic diagram of the outline of a flywheel and an actuating part of Embodiment 1. FIG.

FIG. 7 is a schematic diagram of a scheme in which a guide rail is provided in front of a flywheel in Embodiment 1. FIG.

FIG. 8 is a schematic exploded view of a pivoting scheme of a moving part and a chain guide part in Embodiment 1. FIG.

FIG. 9 is a schematic exploded view of a pivoting scheme of a moving part and a chain guide part in Embodiment 1. FIG.

FIG. 10 is a schematic diagram of a moving part and a chain guide part in Embodiment 1. FIG.

11 and FIG. 1 are exploded views of a moving part and a chain guide part.

FIG. 12 is an exploded view of a moving part and a chain guide part in Embodiment 2. FIG.

FIG. 13 and Embodiment 2 are exploded views of a moving portion and a chain guide portion.

FIG. 14 is an exploded view of a moving part and a chain guide part in Embodiment 2. FIG.

FIG. 15 is an exploded view of a moving part and a chain guide part in Embodiment 2. FIG.

FIG. 16 is a side perspective view of a rear dial mechanism of Embodiment 3. FIG.

FIG. 17 is an exploded view of a rear dial mechanism of Embodiment 3. FIG.

FIG. 18 and Embodiment 3 are exploded views of a moving part and a chain guide part.

FIG. 19 is a schematic diagram of a guide rail and a moving part of Embodiment 4. FIG.

FIG. 20 is a schematic view of a guide rail and a moving part of Embodiment 4. FIG.

FIG. 21 is a schematic view of a guide rail and a moving part in Embodiment 4. FIG.

FIG. 22 is a schematic diagram of a guide rail and a moving part in Embodiment 4. FIG.

FIG. 23 is a schematic diagram of a connection between a base and a soft tail frame in Embodiment 5. FIG.

24, Embodiment 6 is a schematic diagram of a base and an actuating part.

FIG. 25 is a schematic diagram of an actuating part in Embodiment 6. FIG.

FIG. 26 is a schematic diagram of an actuating part in Embodiment 6. FIG.

FIG. 27 is a schematic diagram of an actuating part in Embodiment 6. FIG.

FIG. 28 is a schematic diagram of an actuating part in Embodiment 6. FIG.

Detailed ways

Example 1

As shown in Figures 1 to 4, the base is box-shaped and its thin-walled structure has a light weight. The upper part of the base 01 is preferably a semi-conical truncated cone-shaped like the upper half of a flywheel, which can reduce wind resistance, minimize the shape of the base, and avoid interference with the frame 19. The upper part 01 of the base is provided with a chain outlet 12. The chain outlet 12 can be connected to a winding pipe (a tubular shield sleeved on the chainring to the flywheel chain segment, not shown in the present invention), and becomes a part of the full chain shield. The lower part of the base 08 covers at least the guide rail 20 and the guide wheel 65. The lower part of the base 08 is open downward to accommodate the chain and the legs 60 to pass through. The through slot 09 is designed to accommodate the passage of the axle 11 and the through slot 15 (indicated by a dashed line) is designed to accommodate the hub (hub). After the base is inserted into position from top to bottom, the nut 05 is tightened on the shaft 11 and the base The right wall is clamped between the fork end piece 10 and the hub end cover 13. The cross-section of the guide rail 20 is non-circular (for example, triangular, oval, etc.), and is preferably rectangular in this example. To minimize weight, the guide rail 20 may be designed as a tube. With the same material and the same weight, the torsional strength of the single rail 20 is higher than that of the dual rail solution. The guide rail 20 is inserted into the lower part 08 of the base through the hole 07, and the screw 23 fixedly connects the connecting portion 21 at the end of the guide rail 20 with the cover wall. One end of the wire tube 27 is inserted into the wire tube holder 22 below the connection portion 21. The end portion 26 of the pull wire 25 passes through the wire tube 27 and the hole 06, and is fixedly connected to the hole 56 of the slider 50 by screw connection (or bonding) or the like. The other end of the pull wire 25 is connected to a bicycle control device such as a control handle. The slider 50 has a slideway 55 corresponding to the guide rail 20, and the inner peripheral surface of the slideway 55 and the outer peripheral surface of the guide rail 20 are fitted with a clearance. The outer peripheral surface 51 of the slider serves as the pivot of the guide wheel 65, and the guide wheel 65 is pivotally connected between the snap ring 66 and the stop ring 67. The screw 36 fixedly connects the spring seat 30 to the lower part 08 of the base. The spring seat 30 is tubular. The spring 33 is placed inside the spring seat 30. One end of the pull wire 35 penetrates the front end of the spring seat 30 and the spring 33, and is fixedly connected to the stop at the rear end of the spring 33 by means of bonding (or screw connection). The block 32 and the other end of the pull wire 35 pass through the hole 31 and are fixedly connected to the slider 50 by screwing (or bonding) or the like. The leg 60 (connecting body a) is preferably an elongated entity such as a rod, a tube, or a bar. Below the slider 50 (to the lower rear range), a pivot shaft 53 is provided. The pivot shaft 53 penetrates the torsion spring 53 and the torsion spring seat 58 at the upper end of the shifting leg 60, and is limited by a snap ring 57. The tension wheel 62 is pivotally connected to a pivot shaft 61 at the lower end of the shifting leg 60, and is then limited by a snap ring 63. In order to strengthen the seal, the dustproof cover 03 is tubular. In order not to hinder the movement of the leg 60, the dustproof cover 03 is made of a flexible material such as fabric or rubber film, and the upper part is fixedly connected by means of bonding (or screw fixing). The opening of the lower part of the base 08, the lower part of the dustproof cover 03 is sleeved on the middle or lower part of the shifting leg 60, that is, the space formed by the dustproof cover 03 and the base (01; 08) must cover at least the upper part of the guide chain. The dust cover 03 and the base (01; 08) form a basically closed space, covering the flywheel and most of the rear dial mechanism.

Take downshifting as an example to briefly explain the rear dial shifting process: the rider operates the control handle to relax the pull wire 25 by a certain length, the spring 33 pulls the slider 50 along the guide rail 20 through the pull wire 35 to move the guide wheel 65 to drive the chain from the initial gear position. The flywheel piece moves to the flywheel piece of the target gear. The torsion spring 53 applies a biasing force to the leg 60 so that the tension wheel 62 tensions the chain.

As shown in FIG. 5, the upper part of the base is covered in the upper half of the flywheel, and a chain outlet is provided in front of it. The lower part of the base contains the lower part of the flywheel and a part of the rear dial, and the lower part of the base is opened downward. The guide rail 76 is provided directly below the flywheel. The screw 75 penetrates the connection portion 79 at the upper end of the guide rail 76, and is screwed into the screw hole 73 so that the upper end of the guide rail 76 is fixedly connected to the left wall of the cover; the beam 77 is fixedly connected to the right wall of the cover with screws 82; the screw 78 A hole 81 penetrating the middle of the cross beam 77 is screwed into a screw hole 80 at an end of the guide rail 76 and fixedly connected to the lower end of the guide rail 76.

Figure 6 uses the guide rail 100 located directly below the flywheel as an example to explain the flywheel contour line L1: Think of the flywheel as a cone, the flywheel contour line L1 refers to the prime line closest to the trajectory of the guide wheel 108, "the guide rail is basically parallel to the flywheel “Contour line” means that the projection of the guide rail 100 on the plane where the prime line is located is substantially parallel to the contour line L1 of the flywheel—under the premise of ensuring speed change, the projection of the guide rail 100 and the parallelism of L1 are allowed to float within a certain range. The requirements must be precise parallels. FIG. 6 also shows another actuating part. The spring 102 is sleeved on the outside of the guide rail 100. One end of the spring 102 is pressed against the slider 105 and the other end is pressed against the stopper 106 on the end of the guide rail 100. The end of the wire tube 103 is inserted into the wire tube base of the outer end of the guide rail 100, the pull wire 101 passes through the wire tube 103, and is fixedly connected to the wire base 107 of the slider 105.

FIG. 7 shows a scheme in which the guide rail 02 is located in front of the flywheel 17: viewed from front to rear, the guide rail 02 is located outside and inside high (or substantially horizontal) in front of the flywheel 17. Under the premise of no contact between the chain of the guide wheel segment and the chain between the large sprocket and the chainring, the inner end of the guide rail 02 is allowed to be higher than the axis L2 of the flywheel, that is, the guide rail 02 is located in front of the flywheel 17. This solution can maximize the ground clearance of the tension wheel.

FIG. 8 shows another deflection pivoting mechanism: a torsion spring seat 85 is provided below the slider, the center of the torsion spring seat 85 has a pivot shaft 86, the upper end of the connecting body 60 has a ring portion 88, and the torsion spring 87 penetrates the pivot shaft 86 And is placed in the groove of the torsion spring seat 85, and the pivot shaft 86 is pivotally connected to the ring portion 88 and limited by the snap ring 180. Both ends of the torsion spring 87 are fixed to the torsion spring seat 85 and the ring portion 86 respectively, so that the upper portion of the connecting body 60 is pivotally pivoted to the lower portion of the slider 50. The guide wheel 110 is pivotally connected to the pivot shaft 112 of the slider with a bearing 111.

FIG. 9 shows another chain guide part: the slider 50 is provided with a torsion spring seat 97, and the torsion spring seat 97 is located below and behind the guide rail. The connecting body a includes a guide plate (90; 91). The pivot shaft 93 passes through the hole in the lower part of the guide plate 91, the tension wheel 62 is screwed into the screw hole in the lower portion of the guide plate 90, and the pivot shaft 92 passes through the hole in the upper portion of the guide plate (90; 91). , Washer 95, torsion spring, and then screwed in the screw hole 96.

10 and 11 show another moving part: the slider 160 has a short arm 161 protruding rearward, a pivot 162 is provided at the end of the short arm 161, and a guide wheel 168 is pivotally connected to the pivot 162. And the snap ring 173 limit. A connecting base 170 is provided below the pivot 162, and the connecting base 170 has a pivot hole. The upper part of the connecting rod 166 is provided with a torsion spring seat 163. The torsion spring 165 is provided in the annular groove of the torsion spring seat 163. A pivot 171 is provided in the center of the torsion spring seat 163. The pivot shaft 171 is inserted into the connection seat with a clearance fit. In the pivot hole of 170, an end portion of the pivot shaft 171 is provided with a retaining ring 172 for preventing detachment. One end of the torsion spring 165 is fixedly connected to the torsion spring base 163, and the other end is fixedly connected to the connection base 170. The lower part of the connecting rod 166 is provided with a pivot shaft 167. The tension wheel 169 is pivotally connected to the pivot shaft 167 and is limited by a snap ring 174. Compared with the solutions of Figures 1 to 4, the main differences in this case are: 1. In the solution of Figure 1, the slider body is used as the pivot of the guide wheel, so that the guide rail is located inside the guide wheel, so the guide rail can withstand less torque, so the guide rail can be Designed to be lighter and thinner. However, in this case, the guide wheel pivot is set at the end of the short arm, and the relative torque of the guide rail is relatively large. 2. The position of the deflection mechanism in this case was also changed to the end of the short arm. (The position of the deflection mechanism in this case may still be located from the lower part to the lower back of the slider body).

Note: The common technical solutions in the field of bicycles shown in this example, for example: the connection scheme between the guide wheel and the axle adopts a bearing connection or a shaft / hole clearance fit connection (the two can be replaced equivalently); the structure of the conduit and the cable; These technical solutions are adopted in other embodiments of the present invention, for example, since the post-allocation is not the main creative point of the present invention, it will not be described in detail below.

Example 2

The main difference between this example and Example 1 is that the chain guide portion is different.

As shown in FIG. 12, the chain guide part is similar to the rear shifting leg in the prior art: the connecting body b is composed of a guide plate (208; 207). The upper part of the guide plate (208; 207) is provided with a mounting hole, and two ends of the pivot shaft 212 are fixedly connected to the upper hole of the guide plate (208; 207), respectively. A guide wheel 210 (guide wheel b) is mounted on the pivot shaft 212 with a bearing 211. There are mounting holes in the lower portion of the guide plate (208; 207), and two ends of the pivot shaft 215 are fixedly connected to the mounting holes in the lower portion of the guide plate (208; 207), respectively. The tension wheel 213 (tension wheel b) is mounted on the pivot shaft 215 with a bearing 214.

The slider 201 has a short arm 202. A torsion spring seat 203 is provided at the rear end of the short arm 202, and the torsion spring seat 203 has an annular groove. The torsion spring 206 is built into the groove of the torsion spring base 203. One end of the torsion spring 206 is fixedly connected to the torsion spring base 203 and the other end is fixedly connected to the guide plate 208. The P shaft 205 has an annular flange at one end. At the other end, the central hole of the torsion spring seat 203 and the hole in the upper part of the guide plate 208 are clearance-fitted, and an end of the P shaft 205 protruding from the inner side of the guide plate 208 is provided with a retaining ring 216 to prevent loosening.

FIG. 13 shows another chain guide part: the connecting body b includes a tubular shifting leg 220, and the pivot shaft 221 passes through the pivot hole 222 in the upper part of the tubular shifting leg 220 in an interference manner, and the guide wheel 230 is fitted on the pivot shaft in a clearance fit. 221 is a portion located inside the tubular shifting leg 220. The pivot shaft 223 penetrates through the pivot hole 225 in the lower part of the tubular shifting leg in an interference manner, and the tension wheel 231 is fitted in a clearance fit on a portion of the pivotal shaft 223 located inside the tubular shifting leg 220. The upper nozzle of the tubular leg 220 faces the moving direction of the chain, and the lower nozzle faces the moving direction of the forward chain. The slider has a short arm 250 protruding rearward, and a pivot 251 is provided at an end of the short arm 250. The pivot shaft 251 fits into the pivot hole 226 in the upper part of the tubular shifting leg 220 with a clearance fit. The snap ring 253 is clamped on the end of the pivot 251 to prevent the pivot 251 from being loosened from the tubular shifting leg 220. The torsion spring 252 is sleeved on the outside of the pivot shaft 251, one end is fixedly connected to the torsion spring seat at the end of the short arm 250, and the other end is fixedly connected to the tubular shifting leg 220.

FIG. 14 shows another chain guide part: the connecting body b is composed of a guide plate (229; 322), the pivot 224 is ring-shaped, and the pivot 224 is inserted into the mounting hole on the upper part of the guide plate (229; 322) in an interference manner. The guide wheel 225 is pivotally connected to a middle portion of the pivot shaft 224. The lower part of the guide plate (229; 322) has a mounting hole, and the pivot shaft 30 is interferencely connected to the mounting hole in the lower part of the guide plate (229; 322). The tension wheel 31 is pivotally connected to the pivot shaft 30. The slider 223 is pivotally connected to the inner cavity of the pivot shaft 224 and is limited by a snap ring 226. The slider 223 is further provided with a torsion spring base 222. The torsion spring 228 is built into the groove of the torsion spring base 222. One end of the torsion spring 228 is fixedly connected to the torsion spring base 222 and the other end is fixedly connected to the guide plate 229.

FIG. 15 shows another chain guide part: the upper part of the connecting rod 250 has a ring part 252, which is pivotally pivoted on the slider 258 and limited by the snap ring 257, and the guide wheel 253 is pivoted on the slider 258. The outer peripheral surface is limited by a snap ring 254. The lower part of the connecting rod 250 has a pivot shaft 251, and the tension wheel 255 is pivotally connected to the pivot shaft 251 and is limited by a snap ring 256.

In this example, the moving part and the chain guide part can also be used in any combination. For example, the moving part shown in FIG. 12 and FIG. 13 can be combined with the chain guide part shown in FIG. 14 or FIG. 15. The moving parts shown in FIG. 14 and FIG. 15 are combined with the chain guide part shown in FIG. 12 or FIG. 13.

Example 3

The main difference between this example and Example 1 is that the guide rail and the chain guide are different.

As shown in FIG. 16 to FIG. 17: the guide rail 301 is located in a range from front to bottom to the bottom of the flywheel and is substantially parallel to the axis of the flywheel. The distance between the guide rail 301 and the axis of the flywheel is X, and the distance between the axis of the flywheel and the axis of the crank is W, 6% W≤X≤16% W, preferably 6% W≤X≤10% W. The main body of the slider is a pivot shaft 330. A shaft 331 is provided at the center of the slider. A torsion spring seat 332 is provided at the outer end of the pivot shaft 330. The torsion spring 333 is built in the groove of the torsion spring seat 332. One end of the torsion spring 303 is connected to the torsion spring seat 332, and the other end is connected to the bracket.

The chain guide portion includes a bracket having a short arm 310 (short arm a) and a short arm 311 (short arm b). A guide wheel 312 (guide wheel c) is supported at the end of the short arm 310 with a bearing. The tension wheel 313 (tension wheel c) is supported by the end of the short arm 311 with a bearing. A shaft hole 315 is provided at a connection portion of the short arm 310 and the short arm 311. The distance between the guide wheel 312 and the axis of the shaft hole 315 is Z, and the distance between the tension wheel 313 and the axis of the shaft hole 315 is Y, 1.3Z≤Y≤2.5Z, preferably 1.8Z≤Y≤2.0Z. The angle between the plane of the axis of the guide wheel 312 and the axis of the shaft hole 315 and the plane of the axis of the tension wheel 313 and the axis of the shaft hole 315 are α, 50 ° ≦ α ≦ 85 °, preferably 55 ° ≦ α ≦ 60 ° .

The pivot shaft 330 passes through the shaft hole 315, the torsion spring 303, and the external thread screwed on the end of the pivot shaft 330 with a nut 316 to prevent the pivot shaft 330 from loosening.

When changing speed, the pull wire 305 overcomes the spring force of the spring 306 and drives the slider to move the bracket laterally along the guide rail 301. Due to the different length of the working section of the chain 318 in different gears, the tension of the torsion spring 303 and the chain 318 together makes the bracket wind The pivot 330 rotates to adapt to different gears; the guide wheel 312 drives the chain 318 to shift from the initial gear of the flywheel to the target gear.

Another scheme of the moving part is shown in FIG. 18: the short arm 351 is provided in a range from the rear to the lower side of the slider 350, and preferably the short arm 351 is located behind the slider 350. The end of the short arm 351 has a torsion spring seat 352. The bracket 353 is pivoted to the torsion spring seat 352. Note that unlike the splint-shaped short arm shown in FIG. 17, the short arm of the stent of this case is rod-shaped.

Note: The two types of moving parts and two types of brackets shown in this example can be used in any combination.

Example 4

The main difference between this example and Embodiment 1 is that the guide rail is different from the moving part.

As shown in FIG. 19: two mutually parallel guide rails (401; 402) which are preferably rectangular in cross section (arbitrary shape in cross section), and the slider 403 has the same number of guide rails (401; 402), corresponding positions, and corresponding cross section shapes Chute (slot 404; slot 405). The guide rails (401; 402) are respectively inserted into the slide rails (slots 404; 405).

As shown in FIG. 20: five mutually parallel guide rails 410 (the cross section is an arbitrary shape) are preferably circular. The slider 411 has the same number of slide rails 413 as the number of the guide rails 410, corresponding positions, and corresponding cross-sectional shapes. The guide rails 410 are respectively inserted into the slide rails 413.

It can be seen from the above two cases that the slideway includes a closed type (such as the hole 413) or an open type (such as the groove 404).

As shown in FIG. 21: the pulley is composed of a triangular box plate (436; 437), each of which has a roller 431 at its three vertices, and the guide rail 430 is inserted between the rollers 431. The middle part of the roller 431 has a flange, and two sides of the guide rail 430 have grooves (438; 439), and the flange and the groove (438; 439) are closely attached. In this way, the pulley can slide back and forth along the guide rail 430.

As shown in FIG. 22, the guide rail 460 has a rectangular cross section. The block is composed of upper and lower box plates (461; 462): 4 pivot shafts 463 penetrate through the four corners of the upper and lower box plates (461; 462), respectively. Four rollers 466 are mounted on the pivot 463, respectively. The guide rail 460 is inserted between the rollers 466, and the outer peripheral surface of the roller 466 is closely adhered to the guide rail 460. Each of the rollers 466 has flanges 467 on the upper and lower ends to limit its axial movement.

Theoretically, the present invention allows a plurality of mutually parallel guide rails, for example: 5 parallel-arranged guide rails, and a corresponding roller mechanism is arranged in the pulley. However, in terms of strength, ease of manufacture, etc., it is not practical to use more than five guide rails, and one or two is optimal.

Example 5

The main difference between this example and Example 1 is that the connection scheme of the base and the frame is different.

As shown in FIG. 23, the rear portions of the links (560; 561) of the soft tail frame are pivotally connected together by a pivot 568. The base is box-shaped, and the chain outlet at the front communicates with the opening below. The connecting rod 560 is fixedly connected to the base with screws. Because the axle hole 563 is provided in the connecting rod 560, that is, when the soft tail frame works, the relative orientation of the connecting rod 560 and the flywheel does not change, so the transmission can keep working normally without being disturbed by the frame's shock-absorbing action. A tubular fixing seat 566 is provided on the cover wall of the base. The inner cavity of the fixing seat 566 and the guide rail 565 are clearance fit. After the guide rail 565 is inserted in place, the fixing screw 567 penetrates the fixing seat 566 and the guide rail 565 to make the two fixedly connected. . To install a base for a soft tail frame, it is necessary to follow the principle disclosed in this case: the base is fixedly connected to a rod that does not change its relative orientation with the flywheel during the suspension action.

Example 6

The main difference between this example and Embodiment 1 is that the actuating portion is different.

As shown in FIG. 24, the cover wall of the base is provided with an axle hole 623 to accommodate the axle assembly to pass through. The base is fixedly connected to the frame 629 with at least two connecting members 628. The cylinder 620 is fixedly connected to the base with screws (for hard-tailed frames, the base can also be permanently fixed to the frame by welding, riveting, etc .; or the base is integrated with the frame, such as the rear end of the frame and The base is made of carbon fiber integral molding technology). The piston 622 is located at the front end of the cylinder 620. One end of the pull wire 625 is fixedly connected to the end of the piston 622. The other end of the pull wire 625 penetrates the pull wire hole 627 on the base, and is fixedly connected to the pull wire seat 626 on the slider 619. The one-way force mechanism 618 is fixedly connected to the base with screws, and its pull wire passes through the pull-through hole 616 on the base, and is fixedly connected to the slider 619. One end of the guide rail near the hydraulic component is fixed to the inner wall of the base with 2 screws, and the other end of the guide rail (with screw holes) is fixedly connected to the base with screws 617. During gear shifting, the control device injects or extracts hydraulic oil into the cylinder 620 through the hydraulic pipe 621, thereby driving the piston 622 to extend or retract, and the piston 622 tightens or loosens the pull wire 625, so that the slider 619 is positioned between the piston 622 and the unidirectional force mechanism Under the common action of 618, it reciprocates along the guide rail.

FIG. 25 shows a scheme using a motor as a power source: the base is provided with a through groove 652 that penetrates from the front end to the axle hole (the right through groove 652 can accommodate the axle and the left through groove 652 can accommodate the hub). The base can be inserted into position from back to front without removing the flywheel without installing the guide rail. The motor 655 is fixedly connected to the base with screws. The reel 656 is coaxially fixedly connected to the output shaft of the motor 655. One end of the pull wire 657 is wound around the reel 656, and the other end of the pull wire 657 passes through the pull wire hole on the cover wall and is fixedly connected to the slider (not shown). When changing speed, the motor 655 drives the reel 656 to rotate, thereby pulling or releasing the pull wire 657. Because the motor and the slider are connected "softly" with a pull cable, the solution can also be used to fixedly connect the motor to the frame.

As shown in FIG. 26, the motor 601 is fixedly connected to the lower part of the slider 602 by screws, the gear 603 is fixedly connected to the output shaft of the motor 601, and the rack 605 and the guide rail 606 are integrally manufactured or fixedly connected (welding, screwing, etc.). The slider 602 has a sliding groove corresponding to the guide rail 606, and the rack 605 protrudes from the surface of the slider 602 through the opening of the sliding groove. Gear 603 and rack 605 are often meshed together. When changing speed, the control system outputs current to the motor 601 to drive the gear 603 to rotate relative to the rack 605, thereby driving the slider 602 to move along the guide rail 606, and the position of the slider 602 is sensed and feedbacked by the position sensor of the control system arranged along the guide rail 606. To the cyclist.

As shown in FIG. 27, the primary of the linear motor is provided along the guide rail 610, and the secondary of the linear motor is mounted on the slider 611. When shifting speed, the bicycle's control system outputs current to the linear motor to drive the slider 611 to move along the guide rail 610. The position of the slider 611 is sensed by the position sensor of the control system arranged along the guide rail 906 and is fed back to the rider. In this example, the primary of the linear motor can also be installed on the slider, and the secondary can be installed on the guide rail.

As shown in FIG. 28, the connection base 667 is fixedly connected to the cover (not shown) with screws 666. The cylinder 660 is fixedly connected to the connecting seat 667. The piston 661 is parallel to the guide rail 663. One end of the piston 661 is fixedly connected to the slider 662. One end of the hydraulic pipe 665 is connected to the control device of the bicycle, and the other end is connected to the cylinder 660. During gear shifting, the bicycle control device injects (extracts) hydraulic oil into the cylinder block 660 through the hydraulic pipe 665 to push the piston 661 to extend (contract), thereby driving the slider 662 to move along the guide rail 663.

Note: Although the present invention is disclosed as above with preferred embodiments, it does not limit the scope of the present invention. Any person of ordinary skill in the art can make some improvements without departing from the scope of the present invention, that is, any equivalent improvement made in accordance with the present invention should be covered by the scope of the present invention. For example, the base shown in Embodiment 1 can be applied to other cases; the guide rail, moving part, actuating part, and chain guide part shown in Embodiments 1 to 3 can be applied to other cases; Embodiment 4 shows The guide rail and moving part can be applied to other examples; the connection scheme with the soft tail frame shown in Embodiment 5 can be applied to other examples; the actuating part shown in Embodiment 6 can be applied to other examples; etc. Wait.

Claims

A protective device includes:

The base is box-shaped; the base covers at least the upper part of the flywheel; the lower part of the base is open; the base is integrally manufactured or fixedly connected with the rear part of the frame;

N guide rails, 5≥N≥1; when N> 1, the guide rails are parallel to each other; the guide rails are located in the front to the lower range of the flywheel and are substantially parallel to the flywheel contour line; or the guide rails are located in the flywheel Range from front to bottom and substantially parallel to the flywheel axis;

The guide rail is fixedly connected in the base.
The protective device according to claim 1, wherein the protective device of the present invention further comprises a moving part; the moving part is reciprocally displaceable and connected to the guide rail.
The protective device according to claim 2, wherein the moving portion includes a slider, and the slider has a slide track; and the guide rail passes through the slide track to enable the slide block to slide back and forth. To the guide rail; or the moving part includes a pulley, and the pulley is supported on the guide rail by a roller mechanism so that the pulley can be reciprocally displaced along the guide rail.
The protective device according to claim 2, wherein the protective device of the present invention further comprises an actuating part; the actuating part is actuated and connected to the moving part to manipulate the moving part to move along the guide rail .
The protective device according to claim 4, wherein the actuating portion includes a one-way force mechanism and a pull wire; and the one-way force mechanism is capable of applying a one-way force to the moving portion and is connected to the moving portion. ; The pulling wire is connected to the moving part by applying a reverse force of the unidirectional force.
The protective device according to claim 2, wherein the protective device of the present invention further comprises a chain guide portion; the chain guide portion is synchronously connected to the moving portion to drive the chain to be displaced from the initial position of the flywheel Gear to the target gear of the flywheel.
The protective device according to claim 6, wherein the chain guide portion includes a guide wheel a, a connecting body a, and a tension wheel a; the guide wheel a is pivotally connected to the moving portion; and the connecting body a It has an upper end part a and a lower end part a; the pivot of the upper end part a is pivoted to the moving part; and the tension wheel a is pivotally connected to the lower end part a.
The protective device according to claim 6, wherein the chain guide portion includes a guide wheel b, a connecting body b, and a tension wheel b; the connecting body b has an upper end portion b and a lower end portion b; and the guide wheel b is pivotally connected to the upper end part b; the pivot of the upper end part b is pivoted to the moving part; the tension wheel b is pivotally connected to the lower end part b.
The protective device according to claim 6, wherein the guide rail is located in a range from front to bottom to the bottom of the flywheel and is substantially parallel to the flywheel axis; the guide chain portion includes a guide wheel c, a bracket, and a tension wheel c; the bracket includes a short arm a and a short arm b; a pivot of the connection between the short arm a and the short arm b is deflected at the moving part; the guide wheel c is pivoted at the short arm the end of a; the tension wheel c is pivotally connected to the end of the short arm b; the distance Z from the axis of the guide wheel c to the pivot axis; the distance Y from the axis of the tension wheel c to the pivot axis Y, 1.3Z ≤Y≤2.5Z; the angle between the plane of the c-axis of the guide wheel and the pivot axis, and the plane of the c-axis of the tension wheel and the plane of the pivot axis is α, 50 ° ≤α≤85 ° The guide rail is located in front of and below the flywheel and is substantially parallel to the flywheel axis; the distance between the pivot axis and the flywheel axis is X, and the distance between the flywheel axis and the center plate d axis is W, 6 % W≤X≤16% W.
The chain cover according to claim 6, wherein the protective device of the present invention further comprises a dust cover; the dust cover is flexible; the dust cover is fixedly connected to the lower part of the base to communicate with The base forms a substantially closed space to cover at least the upper part of the chain guide portion.