WO2019237790A1

WO2019237790A1 - Front derailleur

Info

Publication number: WO2019237790A1
Application number: PCT/CN2019/079951
Authority: WO
Inventors: 黄跃波
Original assignee: 黄跃波
Priority date: 2018-06-11
Filing date: 2019-03-27
Publication date: 2019-12-19
Also published as: WO2019237507A1

Abstract

A front derailleur having a protective cover function, comprising: a base, a derailleur portion, and an actuating portion. The base is box-shaped, and the base at least covers the upper portion of a crankset and is fixed to a bicycle frame; the derailleur portion is located inside the base; the actuating portion is operatively connected between the base and the derailleur portion so as to control the derailleur portion to drive a chain to move from an initial gear position of the crankset to a target gear.

Description

Forward dial

Technical field

The invention relates to a speed change device for a bicycle, in particular to a front speed change 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 shrouds or chain guards. In reality, a shift bike with a front dial is rarely equipped with a guard. One of the important reasons is that there is a space conflict between the guard and the front dial. Patent CN2113228U shows such a kind of shield. At the corresponding position, the shield is provided with an opening for accommodating the forward dial through, so that the guide chain part of the forward dial can penetrate into the interior of the shield. Although the invention solves the problem of conflict between the front dial and the shield, it also has the following disadvantages: due to the existence of the opening, the seal of the shield is affected, so that harmful factors such as dust, rain, and water can enter the shield through the opening. Inside, it erodes transmissions such as chains and chainrings. Due to the existence of the opening, the strength of the shield decreases, and the structural weight must be increased if it is to be reinforced, and the increase and decrease in weight is of special significance to the bicycle industry. Because the front dial includes a variety of specifications and shapes, it is almost impossible for manufacturers to produce a shield that can be used for most of the front dial. For example, some soft tail frames have insufficient installation space at the seat tube of the frame. The E-type front dial installed by Wutong is used, and this type of front dial and the shield have a space conflict problem, so they cannot coexist. For another example, the corresponding front cover of the top swing dial and the hem front dial are different, and the size of the front dial of different series from different manufacturers is also different. If a large opening is designed to solve this problem, the protection will be further deteriorated. The tightness of the cover reduces the structural strength of the cover. The gap between the lower section of the frame seat tube and the chainring is located near the center of gravity of the frame, which is particularly suitable for installing components with larger weights such as booster motors. However, the existing front dial occupies this space, making it impossible to install a booster motor here.

The existing forward dial must be disconnected to remove the forward dial during maintenance or replacement, and the process is troublesome.

Summary of the Invention

The main object of the present invention is to provide a front dial with a shield function, which has a better sealing performance.

Another main object of the present invention is to solve the problem of the universality of the chain cover and the front dial.

To this end, the front dial of the present invention includes: a base, a derailleur portion, and an actuating portion; the base is box-shaped, and the base covers at least the upper part of the crankset; the base is fixedly connected to the frame; the derailleur portion is located on the base The inside of the seat; the actuating part is actuated and connected between the base and the derailleur part, so as to manipulate the derailleur part to shift the chain from the initial gear of the chainring to the target gear.

The invention is the first in the industry to design the base and the shield as an integrated structure. Because the transmission mechanism is located inside the base, the base does not need to be provided with an opening for the front dial to pass through, which solves the problem that the existing front dial and the existing shield are difficult to share; and fundamentally solves the problem of the front dial and the shield. Generality issues. The opening of the shield does not only ensure the tightness of the forward dial, but also the strength of the shield. The box-shaped base also solves the problem of greasy rider clothing on the internal mechanism, improves the reliability of the transmission system, reduces the maintenance workload of the transmission system, and reduces the wind resistance of the crankset and front dial (fairing). The box-shaped base with multiple functions will effectively reduce the number of parts, reduce manufacturing costs, and reduce total weight. Because the front dial is set on the base, it no longer occupies the gap between the frame seat tube and the shield, which makes it possible to set a booster motor + shield + front dial at the frame five links, that is, the shield can be installed at the same time in an electric bicycle + Dial forward. This has great commercial value. However, in order to achieve the above-mentioned object of the invention, the inventors also need to solve the bicycle-specific restrictions such as limited installation space of the base, precise installation and positioning requirements, preferably quick disassembly, and convenient maintenance of its internal mechanism. Greatly increased the difficulty of invention. In addition, the box-shaped base can also be used as part of a full chain cover, combined with other parts to form a full chain cover.

A preferred solution of the actuating part is: the actuating part includes a guide rail, a slider, a unidirectional force mechanism a, and a pull wire a; the guide rail is fixedly connected to the base in a transverse direction; the slider can be reciprocally connected to the guide rail; a is connected to the slider capable of applying a unidirectional force; pull wire a is connected to the slider capable of applying a force opposite to the unidirectional force; the slider is fixedly connected to the derailleur or is integrally manufactured.

A preferred solution of the actuating part is: the actuating part includes a link mechanism, a pull wire b, and a one-way force mechanism b; the link mechanism is connected between the base and the derailleur part to support and guide the lateral displacement of the derailleur part The one-way force mechanism b is connected to the link mechanism which can apply a one-way force; the pull wire b can be connected to the link mechanism which can apply a force opposite to the one-way force.

A preferred solution of the actuating part is: the actuating part includes a pivot, a pull wire c, and a unidirectional force mechanism c; the pivot is vertically pivoted on the base; the unidirectional force mechanism c can be connected to the pivot by applying a unidirectional force The pull wire c can be connected to the pivot by applying a force opposite to the unidirectional force; the derailleur portion is fixedly connected to the lower portion of the pivot.

A secondary object of the present invention is that it is not necessary to disconnect the chain when dialing before disassembly. To this end, the derailleur part also includes an anti-off-chain part; the anti-off-chain part can be opened and closed connected to the lower part of the derailleur part to open or close the gap under the derailleur part.

A preferred connection scheme of the base is: at least two lifting eyes a along the circumferential direction are provided at the end of the frame five links; the base and the lifting eyes a are fixedly connected by screws.

A preferred connection scheme of the base is: a lifting ear b is provided at the seat tube of the frame; a lifting ear c is provided at the base; the lifting ear b and the lifting ear c are fixedly connected by screws.

A preferred solution of the base is: the diameter of the crank hole of the base is less than the diameter of the bottom bracket cover; the bottom bracket penetrates through the crank hole and is fixedly connected to the frame bracket, and the base is clamped between the bottom bracket cover and the frame Between the five links. This solution is particularly suitable for soft tail frames.

A preferred solution of the base is that the base is provided with a ring clip; the ring clip is fixedly clamped on the frame seat tube.

A preferred connection scheme of the base is: the base includes a cover body a and a cover body b; the cover body a and the cover body b can be detachably fixedly connected together; the front dial includes a clamping seat; the clamping seat includes a semi-ring Seat a and seat b; seat a is fixedly connected to cover a; seat b is fixedly connected to cover b; seat a and seat b are clamped at the end of the frame five-way or on the center shaft Ends.

BRIEF DESCRIPTION OF THE DRAWINGS

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

Figure 1. Axonometric view of the forward dial of Example 1.

Fig. 2 is a plan view of a front dial of the first embodiment.

Fig. 3 is a rear view of a front dial of the first embodiment.

FIG. 4 is an exploded view of a forward dial in Embodiment 1. FIG.

FIG. 5 is a schematic diagram of a connection scheme between a base and a frame in Embodiment 1. FIG.

FIG. 6 is a schematic diagram of a forward dial using an actuating motor as a power source in Embodiment 1. FIG.

FIG. 7 is a schematic diagram of different schemes of the pedestal of Embodiment 1. FIG.

FIG. 8 is a schematic diagram of a connection scheme between a base and a frame in Embodiment 1. FIG.

FIG. 9 is a schematic diagram of a forward dial in Embodiment 2. FIG.

FIG. 10 is an exploded view of a forward dial in Embodiment 2. FIG.

FIG. 11 is a schematic diagram of a forward dial in Embodiment 3. FIG.

FIG. 12 is an exploded view of a forward dial in Embodiment 3. FIG.

FIG. 13 is an exploded view of the front dial of Embodiment 3, and the base is partially cut away to show the inside.

FIG. 14 is a schematic diagram of a forward dial of Embodiment 4. In order to show the interior, the base is partially cut away.

FIG. 15 is an exploded view of a forward dial in Embodiment 4. FIG.

FIG. 16 is a perspective view of a forward dial of Embodiment 5. FIG.

FIG. 17 is an exploded view of a forward dial in Embodiment 5. FIG.

FIG. 18 is a schematic diagram of another link scheme of Embodiment 5. FIG.

FIG. 19 is an isometric view of a forward dial of Embodiment 6. FIG.

Fig. 20 is an exploded view of a forward dial in Embodiment 6.

Figure 21, Axonometric view of the forward dial of Example 7.

FIG. 22 is an exploded view of a forward dial in Embodiment 7. FIG.

Figure 23, Axonometric view of the front dial of Example 8.

Fig. 24 is an exploded view of a front dial of the eighth embodiment.

FIG. 25 is a schematic diagram of a connection scheme between a base and a frame in Embodiment 9. FIG.

detailed description

Example 1

As shown in FIG. 1 to FIG. 5, the base is box-shaped as a whole, and includes a cover body (101; 102), and the rear end of the cover body (101; 102) is open to accommodate the chain in and out. An opening 103 through which the slider 107 penetrates is provided on the top of the cover 101. The base is provided with a crank hole 105 at a position corresponding to the bottom bracket. The clamping seat includes two semi-annular base bodies (121; 122), and the base bodies (121; 122) are fixedly connected to the cover body (101; 102) by screws 125 (or bonding, and the base body and the cover body are integrally manufactured). ). The seat body (121; 122) is spliced into a ring shape and clamped at the end of the frame tee 155, and then fastened with 2 screws 123. In this way, the base is fixedly connected to the middle of the frame (this connection scheme is particularly suitable for soft tail frames), and the cover body (101; 102) is also stitched together. The cover body (101; 102) also includes a variety of The connection scheme, for example: 1. The lower part of the cover body 101 is sleeved on the upper part of the cover body 102, and the joints of the two overlap, and several screws pass through the joints of the cover body (101; 102). 2. The lower part of the cover body 101 is provided with a plurality of card bamboos along the circumferential direction, and the upper part of the cover body 102 is provided with a plurality of card grooves along the circumferential direction.

The actuating part includes a guide rail 106, a slider 107, a pull wire 110, a spring 111 (unidirectional force mechanism), and a wire tube 112. Two brackets (115; 116) are fixedly connected to the cover walls at the left and right ends of the opening 103, respectively. The cross-section of the guide rail 106 is non-circular (for example, triangular, hexagonal, etc.), and preferably rectangular. The two ends of the guide rail 106 are fixedly connected to the bracket (115; 116) with screws 106a, and the slider 107 has a through hole 107a that is fitted with the guide rail 106 in a clearance fit. The guide rail 106 passes through the through hole 107a. The slider 107 is provided with a through wire hole, and the wire 110 penetrates the wire hole. The diameter of the end of the wire 110 is larger than the diameter of the wire hole. (Or use a common pull wire fixing scheme in the prior art: the pull wire is wound around the anchor screw once, and the anchor screw is screwed in the screw hole of the slider to fix the pull wire). The spring 111 is sleeved on the outside of the pull wire 110, and one end of the spring 111 is closely attached to the side of the slider 107. The other end of the spring 111 is in close contact with the side of the bracket 115. A tubular wire socket 115a is provided on the outer side of the bracket 115, and the end of the wire pipe 112 is inserted into the wire socket 115a with an interference. The pull wire 110 runs through the wire tube 112. The derailleur part is the prior art and includes derailleur plates (108; 109) located on both sides of the chain, respectively. The upper end of the derailleur plate (108; 109) is manufactured integrally (or fixedly connected together by means of welding, screw connection, etc.). The derailleur part is integrally manufactured with the slider 107 (or fixedly connected together by means of welding, bonding, screw connection, etc.).

During shifting, the rider pulls the pull wire 110 through the handle to overcome the elastic force of the spring 111, and the slider 107 is displaced along the guide rail 106. The slider 107 drives the derailleur plate (108; 109) to move laterally, and the derailleur plate (108; 109) pushes the chain The initial gear shifts to the target gear from the initial position of the chainring 150. On the contrary, when the pull wire 110 is loosened, the derailleur plate (108; 109) pushes the chain horizontally under the action of the spring force of the spring 111. This example also has the ability to quickly disassemble to facilitate cleaning the chain or troubleshooting. By loosening the screws 123, the cover body (101; 102) can be removed from the frame.

This example also includes several variants:

1. Since the actuating part and the derailleur part are both provided on the upper part of the crankset, the base may include only the cover body 101.

2. The pulling wire is powered by the actuating motor. For example, as shown in FIG. 6: the actuating motor 160 is fixed on the top of the cover 101 with bolts. An output shaft of the actuating motor 160 is fixedly connected to a winding shaft 161, and a pull wire 162 is wound around the winding shaft 161. When shifting speed, the control device (not the present invention) sends an operating current to the actuating motor 160, and the actuating motor 160 drives the winding shaft 161 to tighten or release the pulling wire 162. Since the actuating motor 160 is usually installed on the base, the pull wire 162 can be a bare wire or a wire tube + core wire solution.

3. The pulling line uses a piston mechanism as a power source, for example, the actuating motor 160 in the solution in FIG. 6 is changed to a hydraulic or pneumatic piston. Note: The piston mechanism is a common technique, see Figure 20.

4. The actuating part includes a solution in which a linear motor is used instead of a unidirectional force mechanism + a wire. That is, on the basis of the schemes in FIGS. 1 to 4, the spring 111 and the pull wire 110 are cancelled, the primary of the linear motor is set along the guide rail 106, and the secondary of the linear motor is set on the slider 107, so that the slider 107 can be mounted on the linear motor. Under the control of the actuator, it reciprocates along the guide rail 106.

5. As shown in FIG. 7, the cover body (170; 171) can be regarded as a base formed along a vertical plane. The clamping bases (121; 122) are fixedly installed on the cover (170; 171), respectively, and the clamping bases (121; 122) are clamped at the end 156 of the bottom bracket and fastened with bolts. In order to better seal the crankset, the middle part of the rear end of the cover body 171 is closed with a cover wall 172, leaving only the chain entrance and exit (173; 174). It can be understood from the scheme of FIG. 1 that the reticle of the base body includes any plane where the axis of the crankshaft is located.

6. FIG. 8 shows another connection scheme between the base and the frame: the ring clamp 173 is fixedly clamped on the frame riser (not shown). The base 175 is provided with a lifting ear 176, and the ring clip 173 and the lifting ear 176 are fixedly connected together by screws 177. In addition, the present invention also includes a scheme that no ring ears are provided, and the ring clamp is fixedly connected to the base by means of bonding, welding, and the like.

7. Fig. 8 also shows another unidirectional force mechanism: the reed 178 is arranged in the longitudinal direction. One end of the spring 178 is fixedly connected to the reed seat 179, the reed seat 179 is fixedly connected to the base 175, and the reed 178 Press the other end of the slider to apply a lateral unidirectional force to the slider.

8. In this example, in order to clearly show the structure of the transmission mechanism, it is exposed outside the cover 101. In order to strengthen the sealing, the present invention may also preferably include a dust cover, the dust cover is box-shaped, the dust cover covers the transmission mechanism such as the guide rail 106 exposing the cover body 101, and then is fixedly connected to the cover by screwing or engaging.壳体 101。 The cover body 101.

9. In order to prevent the chain from falling out of the derailleur during intense riding, the prior art uses the lower end of a derailleur plate to bend to close the gap between the derailleur plates. However, this method must be disconnected before disassembling Chain. In order to facilitate the repair or replacement of the front dial, this example also shows another solution: the lower gap of the derailleur plate (108; 109) is open, and the anti-off chain part includes bolts 168, which are screwed onto the derailleur plate (108 109) in the screw hole 168a at the lower end. Of course, the present invention can also use the derailleur part of the prior art.

Example 2

This example differs from Embodiment 1 in that the base and the actuating portion are different.

As shown in FIGS. 9 and 10, the base 201 is box-shaped with an open rear end, so that when the base is inserted into the installation position from front to back, it can accommodate the chainring and the chain. At a position corresponding to the center axis, the base 201 is provided with a crank hole. From the crank hole to the rear of the base, a through groove 201b is provided in the cover wall inside the base 201, the purpose of which is to allow the base 201 to pass through during the installation. At the five-way position in the middle of the frame 202, at least two, preferably three, lifting eyes 202a are provided. The screws 202b pass through the holes of the lifting eyes 202a and are screwed into the screw holes 201a on the inner wall of the base 201. In this way, the base 201 is fixedly connected to the middle of the frame 202. Through holes 201c are formed on the cover walls on both sides of the base 201. The hole 201c and the guide rail 203 are clearance fit. The guide rail 203 is inserted into the hole 201c, and the screw 203a penetrates the connecting plate at the outer end of the guide rail 203 and is screwed into the screw hole on the outer cover wall of the base 201 to fix the guide rail 203. The slider 209 is sleeved on the guide rail 203 and can be reciprocally slid. The chain guide 210 is integrally manufactured (or welded, bonded, and screwed) on the lower part of the slider 209. In this example, the magnetic ring pair 208 is equivalent to the spring in Example 1. The siblings of the magnetic ring 208 are opposite to each other, and the repulsive magnetic force is used to replace the spring force of the spring. A magnetic ring pair 208 is sleeved on the outside of the guide rail 203. One magnetic ring is attached to the slider 209, and the other magnetic ring is attached to the inner wall of the base 201. An end portion of the pull wire 206 is fixed to the slider 209, and an end portion of the wire tube 207 is fixed (threaded) to a connection seat 205 provided on a cover wall inside the base 201.

Example 3

This example differs from Embodiment 1 in that the actuating portion is different.

As shown in FIGS. 11 and 12, the actuating part includes a parallel link (312; 313), a connecting body 319, a pull wire 310, a wire tube 311, a connecting wire 315, a spring 316, and a spring seat 317. The upper end of the derailleur plate (308; 309) is integrally manufactured (or fixedly connected by welding, bonding, etc.) on the connecting body 319. The upper part of the connecting body 319 has two pivot shafts 331, and the rear ends of the connecting rods (312; 313) have holes, respectively. The pivot shafts 331 are clearance-fitted and penetrate the holes at the rear ends of the connecting rods (312; 313). Two snap rings 335 are respectively Mounted in the slot at the end of the pivot 331. Two pivots 330 penetrate the upper cover wall of the base 301, the front end of the connecting rod (312; 313) has a hole, and the pivot shaft 330 fits through the hole of the front end of the connecting rod (312; 313). The two snap rings 333 are respectively Mounted in a slot at the end of the pivot 330. The upper portion of the connecting body 319 is provided with a wire holder 332. An end of the wire tube 311 is fixedly connected to a wire tube base 351 provided on the top of the base 301. The pull wire 310 passes through the wire tube 311, and the end of the pull wire 310 is fixedly connected to the pull wire rod 332. The pull rod 332 is integrally manufactured on the top of the connecting body 319. The spring seat 317 is fixedly connected to the top of the base 301 with a screw 355. The spring seat 317 is tubular (in order to clearly show its internal structure, the upper part of the spring seat 317 is cut away in the figure). The spring 316 is placed in the spring seat 317, and an end cover 316a at one end of the spring 316 abuts the inner end wall of the spring seat 317. The connecting wire 315 penetrates the end of the spring seat 317, the end cover 316a of the spring 316, and the spring 316, and then is fixedly connected to the end cover 316b of the other end of the spring 316. The other end of the connecting wire 315 passes through the terminal block 352 provided on the top of the base 301, and is fixedly connected to the pull rod 332, so that the spring force of the spring 316 finally acts on the derailleur plate (308; 309).

FIG. 13 shows a scheme in which the actuator of this type is built in the base. The connecting rods (312; 313) are located inside the base 301. The top of the base 301 has two pivot holes 301a; the two pivot holes 301a of the respective clearances of the two screws 361 are screwed into the screw holes at the ends of the connecting rods (312; 313). One end of the derailleur plate (308; 309) is integrally manufactured in the connecting body 365, and the connecting body 365 has 2 pivot holes; the two screws 362 pass through the pivot holes provided at the other end of the connecting rod (312; 313) with a gap respectively. Then screw it into the screw hole of the connecting body 365. The end of the pull wire 310 is fixedly connected to the connecting body 365, one end of the spring 360 is pressed against the connecting body 365, and the other end is pressed against the inner wall of the base 301. An end of the wire tube 311 is screwed to a wire tube base (not shown) provided on a side wall of the base 301.

During shifting, the pull wire 310 overcomes the spring force of the spring (316 or 365), and causes the connecting body (319 or 365) to laterally move under the limitation of the connecting rod (312; 313), thereby driving the derailleur plate (308; 309) to Achieve variable speed.

Example 4

As shown in FIG. 14 and FIG. 15, the cover wall at the top of the base 401 is provided with two

ear plates

401 a and 401 b which are arranged forward and backward and vertically downward. Each end of the ear plate (401a; 401b) is provided with a pivot hole. Both ends of the four links (422a; 422b; 422c; 422d) are provided with pivot holes. The pivot holes at the upper end of the connecting rod (422a; 422b; 422c; 422d) are aligned with the pivot holes at both ends of the ear plate (401a; 401b). Two pivots 421 penetrate the pivot hole on the ear plate (401a; 401b) and the pivot hole at the upper end of the connecting rod (422a; 422b; 422c; 422d) respectively. One end of the pivot 421 is provided with a shaft cap, and the other end is provided with There are snap grooves and snap rings, so that the upper end of the connecting rod (422a; 422b; 422c; 422d) is pivotally connected to the ear plate (401a; 401b). The upper part of the derailleur plate (408; 409) is manufactured as a whole, and is provided with two front and rear lifting eyes 420. Both ends of the lifting eyes 420 are provided with pivot holes. The pivot holes at the lower ends of the connecting rods (422a; 422b; 422c; 422d) are aligned with the pivot holes at both ends of the lifting ear 420. Two pivots 423 penetrate the pivot holes at both ends of the lifting lug 420 and the pivot holes at the lower ends of the connecting rods (422a; 422b; 422c; 422d). One end of the pivot 423 is provided with a shaft cap, and the other end is provided with a slot and a The snap ring, so that the lower end of the connecting rod (422a; 422b; 422c; 422d) is pivotally connected to the upper part of the derailleur plate (408; 409). A deflection spring 416 is sleeved on a pivot 421. One end of the spring 416 is caught on the connecting rod 422a, and the other end is caught on the inner wall of the base 401. The wire hook 413 is fixedly connected (bonded, welded, etc.) or integrally manufactured on the connecting rod 422d, and the end of the wire 410 is fixedly connected to the wire hook 413. The outer wall of the base 401 is provided with a wire socket (not shown), and the wire pipe 411 is inserted into the wire socket with interference. During shifting, the pull wire 410 pulls the link 422d against the spring force of the spring 416, and drives the derailleur plate (408; 409) to move laterally. Note: The link mechanism in this case is actually similar to the link mechanism of the swing-up forward dial commonly used in the prior art.

This scheme also shows another anti-off-chain portion. The lower part of the derailleur plate (408; 409) is provided with a through hole 460, and the through hole 460 is a rectangular hole. The front part of the bamboo shoot 461 is provided with 2 reeds, and the end of the spring leaf is provided with a barb, so that the bamboo shoot 461 is inserted into the through-hole 460, and the barb of the spring leaf fixes the bamboo shoot 461 in the through-hole 460. To remove the bamboo shoots 461, press the reeds in the opposite direction to release the barbs of the springs from the side of the derailleur plate 408 to exit the bamboo shoots 461. In the prior art, the structure of the anti-off-chain part is various, for example: 1. The anti-off-chain part also includes a bolt, which penetrates the lower end of the two derailleur plates, and is fixedly connected to it by means of screws or interference fit. Into the pin hole at the end of the derailleur plate. 2. The anti-off chain part includes a baffle plate. One end of the baffle plate is pivotally connected to the lower end of a derailleur plate. The baffle is turned to block the gap between the derailleur plates. The other end of the baffle plate is fixed by screws or buckles. It is fixedly connected to the lower end of another derailleur plate by other methods.

Example 5

As shown in FIGS. 16 and 17, an inner cover wall of the base 501 is provided with an opening 502 and a connection seat 503. The cross section of the connecting base 503 is U-shaped, and two pivot holes are provided on each of two side walls thereof. The upper and lower ends of the connecting rods (510; 511; 512; 513) are provided with pivot holes. The pivot hole at the lower end of the connecting rod (510; 511; 512; 513) is aligned with the pivot hole of the connecting seat 503 one by one and is pivotally connected together by a pivot (517; 518). The connecting member 531 is a U-shaped rod member, each of which has two pivot holes on both sides, and the middle of the connecting member 531 passes through the opening 502 and is fixedly connected to the derailleur portion 530 with two screws 532. The pivot hole at the upper end of the connecting rod (510; 511; 512; 513) is aligned with the pivot hole of the connecting member 531 one by one and is pivotally connected together by a pivot (515; 516). The torsion spring 519 is sleeved in the middle section of the pivot 517, and one end of the spring 519 is caught in a hole in the middle of the connecting rod 512. The other end of the spring 519 is pressed against the connecting seat 503. The connecting rod 513 is different from other connecting rods (510; 511; 512). The connecting rod 513 is L-shaped, and the lower part is provided with a screw hole 515. The screw 521 has a wire drawing hole. The wire 502 passes through the wire drawing hole. The screw 521 is screwed in the screw hole. 515 and clamp the pull wire 520 between the connecting rod 513 and the end cap of the screw 521. The mounting seat 523 is a pipe hoop structure. The mounting seat 523 is clamped to a frame seat tube (not shown), and the mounting seat 523 is further provided with a wire tube seat 525. The end of the wire tube 522 is inserted into the wire tube seat 525 in an interference manner, and the pull wire 520 penetrates the inside of the wire tube 522. Note: Referring to Figure 6, the pull wire in this example can also be driven by an actuating motor. During the speed change, the pull wire 520 overcomes the spring force of the torsion spring 519, pulls the link 513, rotates the link 513 about the pivot 518, drives the connecting member 531, and then drives the derailleur portion 530 to move laterally relative to the base 501 to achieve speed change.

Compared to the previous case, Figure 18 also shows a slightly different solution: 1. One link is eliminated (510 in Figure 17). Correspondingly, one side of the connecting member 531a is slightly shorter and is provided with only one pivot hole; the connecting seat 503a is also no longer provided with a pivot hole for connecting a connecting rod (510 in FIG. 17). 2. The position of the pivot hole of the connecting seat 503a for pivotally connecting the connecting rod 513 is higher than the original, that is, the connecting rod 513a (the section from the connecting member 531a to the connecting seat 503a) is shorter than the connecting rod 512a.

Note: 1. The link mechanism in this case is similar to the push-down forward link structure commonly used in the prior art. 2. This example, examples 3 and 4 are all schemes in which the actuating part is a link mechanism. 3. For better dustproofness, the connecting base (503; 503a) in this example may also preferably be a rectangular tube, and the link mechanism is installed inside the connecting base (503; 503a).

Example 6

As shown in FIG. 19 and FIG. 20, the inner cover wall of the base 601 is provided with a connecting seat 602. The connecting seat 602 is tubular, the outer peripheral surface is engraved with external threads, and the inner cavity thereof is non-circular (rectangular, hexagonal, Spline type) is preferably hexagonal in this example. The movable rod 607 is a hexagonal prism. The movable rod 607 and the inner cavity of the connection base 602 are clearance fit. The movable rod 607 is inserted into the connection base 602 and can be reciprocated. The upper part of the derailleur part 603 is provided with a hole 605. Non-circular, this example is preferably hexagonal. An end 606 of the movable rod 607 is a hexagonal prism, and the end 606 and the hole 605 are connected by interference fit. A hole 608 is provided at the axial center position of the other end of the movable rod 607. The hydraulic (pneumatic) pressure piston includes a cylinder block 610. The hydraulic (pneumatic) pressure tubes (612; 615) are connected to both ends of the cylinder block 610, respectively, and the piston head 611 is located between the hydraulic (pneumatic) pressure tubes (612; 615). Inside the cylinder block 610. The end of the piston rod 611a is connected with the hole 608 in an interference fit. One end of the sleeve 609 is provided with an internal thread and is screwed on the external thread of the connecting seat 602. The sleeve 609 is sleeved on the outside of the piston rod 611a and the movable rod 607. The other end of the sleeve 609 is fixedly connected with the cylinder 610 by screws 616. During shifting, the hydraulic (pneumatic) pressure pipe (612; 615) injects / extracts hydraulic fluid (compressed gas) to the cylinder 610, the piston (611; 611a) is pushed, driving the movable rod 607, and then the lateral displacement of the derailleur 603 .

Example 7

As shown in FIG. 21 and FIG. 22, a connecting seat 731 is provided on the inner cover wall of the base 701. The connecting seat 731 has a circular tube shape, the outer peripheral surface of which has external threads, and the inner hole 733 of which has a non-circular cross section. It is preferably rectangular. The derailleur portion 708 is located inside the base 701. The cross-sectional shape of the movable rod 717 is corresponding to the hole 733 and is a clearance fit. The movable rod 717 is inserted into the hole 733 and can be reciprocated. (Or the movable lever 717 and the derailleur part 708 are integrally manufactured). The spring 716 is sleeved on the outside of the movable rod 717 and is located between the derailleur portion 708 and the inner wall of the base 701. The other end of the movable rod 717 protrudes from the connecting seat 731. One end of the sleeve 730 has an internal thread. The sleeve 730 is sleeved on the outside of the movable rod 717. The internal thread of the sleeve 730 is screwed to the external thread of the connecting seat 731. The other end of the sleeve 730 has a wire socket, and the end of the wire pipe 711 is inserted into the wire socket with interference. A pull wire 710 penetrates the wire tube 711, and an end portion of the pull wire 710 is inserted into a hole at an end of the movable rod 717 and is fixedly connected to the movable rod 717 by means of bonding or screw pressing. During shifting, the pull wire 710 overcomes the spring force of the spring 716 and pulls the movable lever 717. The movable lever 717 is limited by the hole 733 and slides along its axial direction to drive the derailleur portion 708 to move laterally.

Example 8

As shown in FIGS. 23 and 24, the base 801 is box-shaped. The base 801 is provided with a chain inlet 802 and a chain outlet 803 toward the moving direction of the chain. A groove 805 is provided between the chain inlet 802 and the chain outlet 803. The purpose of the groove 805 is to prevent interference between the base 801 and the flat fork of the frame. The cover wall on the side of the base 801 is provided with a crank hole, the diameter of the crank hole is smaller than the diameter of the bottom bracket cover 811, and the bottom bracket 810 is inserted into the crank hole and screwed in the frame bracket. In this way, the cover wall of the base 801 is clamped between the bottom bracket end cover 811 and the end face of the frame five-way. To facilitate the installation of the crankset, a cover wall on the outside of the base 801 is provided with a crankset hole 812. In order to strengthen the seal, it is preferable that the base 801 further includes a cover plate 808 for closing the crank hole. The crank hole cover 808 is inserted into the crank hole 812 in an interference manner. The cover wall above the base 801 is provided with a ring-shaped base 806, and the base 806 and the cover wall are provided with step holes 807. The step holes 807 are large and small. The twisting portion 823 is composed of two rings that are large and small, and two ears are provided on the upper portion of the twisting portion 823 for connecting the pull wire 827 and the one-way force mechanism 826. The lower ring of the torsion portion 823 fits with the upper portion of the step hole 807 so that the torsion portion 823 can rotate in the base 806. The hole 824 is divided into two sections, the lower section is a non-circular hole (preferably a rectangular hole in this example), and the upper section is a round hole. The derailleur part 821 is provided with a shaft 822. The shaft 822 is divided into two sections. The lower section is a non-circular shaft corresponding to the lower section of the hole 824, and the upper section is a circular shaft corresponding to the upper section of the hole 824. The shaft 822 is inserted into the hole 824 and protrudes. The shaft 822 fits with the lower section of the hole 824 to transmit the torque of the torsion portion 823 to the derailleur portion 821 through the shaft 822. The protruding portion of the shaft 822 is provided with a locking slot, and the limiting retaining ring 825 is caught in the locking slot. The one-way force mechanism 826 includes a spring, a protective sleeve, and a one-way force wire. The protective sleeve is tubular and is fixedly disposed on the base. The spring is placed in a protective case. The one-way force pull wire penetrates the end wall of the protective sleeve, and then penetrates the interior of the spring to the distal end of the spring. The one-way force pull wire is located at one end of the spring with a stopper, and the other end is connected to one ear of the torsion portion 823. The base 801 is also provided with a wire socket 809. One end of the wire tube 827 is fixedly inserted into the wire tube holder 809, one end of the pull wire penetrates the wire tube 827 and is connected to the other ear of the torsion portion 823, and the other end of the pull wire is connected to a shifting handle (or an actuating motor). During shifting, the pull wire overcomes the pulling force of the one-way force mechanism 826, pulls the ear of the torsion portion 823, and rotates the torsion portion 823 relative to the base 806. The torsion portion 823 drives the derailleur portion 821 through the shaft 822, and the derailleur portion 821 is turned The chain achieves variable speed.

Example 9

This example differs from Embodiment 1 in that the connection method between the base and the frame is different: the base 901 is provided with lifting eyes 902, and the seat tube of the frame 903 is provided with lifting eyes 905. At least two screws 906 will suspend the The ears (902; 903) are fixedly connected together.

It can be seen in the figure that the box-shaped base is provided with a protruding chain inlet and a chain outlet, so that the base can be easily connected with other parts of the full chain cover to form a full chain cover together.

Note: The full chain cover scheme is not the present invention and is not shown.

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, without departing from the scope of the invention, should make equivalent improvements in accordance with the invention, which should be covered by the scope of the invention. For example, the scheme using the actuating motor as the power source for the pull line shown in FIG. 6 can be applied by the skilled person to other schemes of the present invention as appropriate.

Claims

A front dial includes: a base, a derailleur portion, and an actuating portion;

The base is box-shaped, and the base covers at least the upper part of the crankset; the base is fixedly connected to the frame;

The derailleur portion is located inside the base;

The actuating portion is actuated and connected between the base and the derailleur portion to manipulate the derailleur portion's dial chain to move from the initial position of the crank to the target position.
The front dial according to claim 1, wherein the actuating portion comprises a guide rail, a slider, a unidirectional force mechanism a, and a pull wire a;

The guide rail is laterally fixedly connected to the base;

The slider can be reciprocally connected to the guide rail;

The one-way force mechanism a is capable of applying a one-way force to the slider;

The pull wire a is connected to the slider capable of applying a force opposite to the unidirectional force;

The slider and the derailleur part are fixedly connected or integrally manufactured.
The front dial according to claim 1, wherein the actuating portion comprises a link mechanism, a pull wire b, and a one-way force mechanism b;

The link mechanism is connected between the base and the derailleur part, and is used to support and guide the lateral displacement of the derailleur part;

The one-way force mechanism b can be connected to the link mechanism by applying a one-way force;

The pull wire b is connected to the link mechanism capable of applying a force opposite to the unidirectional force.
The front dial according to claim 1, wherein the actuating portion comprises a pivot shaft, a pull wire c, and a one-way force mechanism c;

The pivot is vertically pivoted to the base;

The one-way force mechanism c can be connected to the pivot shaft by applying a one-way force;

The pull wire c can be connected to the pivot axis by applying a force opposite to the unidirectional force;

The derailleur portion is fixedly connected to a lower portion of the pivot shaft.
The front dial according to claim 1, wherein the derailleur part further comprises an anti-off chain part;

The anti-off-chain part can be opened and closed connected to the lower part of the derailleur part to open or close the gap of the lower part of the derailleur part.
The front dial according to claim 1, wherein at least two lifting eyes a are provided along an end of the five-way of the frame, and the base is fixedly connected to the lifting eyes a by screws.
The front dial according to claim 1, wherein the frame seat tube is provided with lifting eyes b; the base is provided with lifting eyes c; the lifting eyes b and the lifting eyes c are screwed Fixed connection.
The front dial according to claim 1, wherein the diameter of the crank hole of the base is less than the diameter of the end cap of the bottom bracket; the bottom bracket penetrates the crank hole and is fixedly connected to the five-way of the frame, so The base is clamped between the bottom bracket end cover and the frame five.
The front dial according to claim 1, wherein the base is provided with a ring clip; and the ring clip is fixedly clamped on a frame seat tube.
The front dial according to claim 1, wherein the base comprises a cover body a and a cover body b; the cover body a and the cover body b are fixedly connected to each other in a removable manner; The dial includes a clamping base; the clamping base includes a semi-annular base body a and a base body b; the base body a is fixedly connected to the cover body a; and the base body b is fixedly connected to the cover body b; the seat body a and the seat body b are clamped at the end of the frame five-way or the end of the bottom bracket.