TWI551506B - The crank structure of a chainless bicycle - Google Patents

Description

Crank structure of chainless bicycle

The utility model relates to a crank structure which can be widely applied to a chain-free driving bicycle, in particular to a gear-driven joint of at least one main transmission gear for a passive shaft on a structure of a crank, and a tooth surface of the main transmission gear disposed on the crank structure The direction is away from the crank.

Generally known bicycle transmissions are designed in the form of chain transmission in the traditional design, and the chain transmission design often makes the rider feel inconvenient and troublesome, such as: pants, skirts are broken by chains and gears, chains fall off, and The dangerous situation of falling pants and skirts and causing falls is a situation that the bicyclist is worried about and easy to encounter.

Therefore, the industry has studied the problem of bicycle chain transmission, and proposed the so-called chain-free transmission design theory, such as the technical literature known in the country: Announcement No. 020933 "Unchained Bicycle", Announcement No. 080842 "Unchained Bicycle", Announcement No. 151304 "Improvement of Driveless Structure of Unchained Bicycles", Announcement No. 160332 "Structure of High Speed Bicycle without Chains", Announcement No. 163732 "Gearless Positioning Device for Chainless Bicycles", Announcement No. 163734 "No Chain Bicycle Rear Wheel Transmission" "Fixed structure improvement", Announcement No. 171678 "Improvement of transmission structure of chainless bicycle", Announcement No. 206534 "Improvement of chainless bicycle drive device", Announcement No. 215237 "Improvement of unchained bicycle drive structure (1)", Announcement No. 210945 "Additional (1) Gearless Positioning Device for Unchained Bicycles", Announcement No. 242859 "Improvement of Unchained Bicycle Drive Structure (Additional Two)", Announcement No. 259066 "Unchained Vehicle Drive Connection Device", Announcement No. 319204 No. "No-chain bicycle transmission gear and flower hub combination structure improvement", Announcement No. 334997 "Unchained bicycle structure improvement", Announcement No. 478485 "Unchained bicycle transmission shaft shaft and gear coupling device", announcement No. 484576 "Improvement of the frame structure of the chainless bicycle", Announcement No. 522113 "Bicycle chainless transmission mechanism", Announcement No. 528032 "Unchained bicycle transmission and frame coupling device", Announcement No. 537277 "Unchained Bicycle Actuator and Assembly Structure Improvement", Announcement No. 537278 "Unchained Bicycle Actuator and Assembly Structure Improvement (II)", Announcement No. I245000 "Package Type Bicycle Chainless Transmission and Speed Control Mechanism", Announcement No. M325975 "Drive Structure of Chainless Bicycle", Announcement No. M355894 "Improved Structure Modification of Chainless Bicycle Transmission Mechanism", Announcement No. M358786 "Concealed Bicycle with Transmission Gear Mechanism", Announcement No. M446148 "None Chain bicycle actuator and frame coupling device, etc.

In foreign countries, such as the United States known technical documents: US Patent No. 3782210, No. 3861715, No. 3863503, No. 3872736, No. 3934481, No. 4005611, No. 4029332, No. 4416673, No. 447068, No. 4613010, No. 4813302, No. 48131889, No. 4943077, No. 5078416, No. 5228354, No. 5251504, No. 5299819, No. 5316327, No. 5,432,075, No. 5,482,306, No. 5,496,049, No. 5,622,081 No., American Design No. 401538, and so on.

In the technical literature on the development of bicycle chainless transmission mechanisms in domestic and foreign countries, the chainless transmission design has no compatibility with the frame of the existing chain transmission bicycle, but must be based on a unique frame. A unique chain-free transmission mechanism can be set up to produce a chain-free drive bicycle. Therefore, the creator of this case has also created a package-type chainless transmission mechanism that can be directly assembled on the existing chain transmission frame, such as Announcement No. 522113 "Bicycle Chainless Transmission Mechanism" and Announcement No. I245000 "Package Bicycle No chain drive and speed control mechanism, making new or old cars lighter Easy to change to a chainless drive bike.

However, it is checked that the pedal driving gears of the above-mentioned known bicycle chainless transmission mechanism are fixedly arranged on the rotating shaft of the frame, and the pedal cranking movement fixed at both ends of the rotating shaft is also arranged in series, so that the rotating shaft synchronously drives the chainless transmission mechanism. The pedal driving gear rotates. Because the driving gear train is placed on the rotating shaft of the frame, it is easily limited by the overall design coordination of the bicycle in the actual implementation of the space, and can be separately fixed and placed on the frame rotating shaft. The drive gear assembly of the chainless transmission mechanism has high manufacturing cost and complicated assembly procedures, and is an object to be improved and innovated for improving the industrial applicability and economic efficiency of the product.

The creation of this case is a crank structure that can be widely used in bicycles without chain drives. Its purpose is to:

1. Effectively reduce and improve the installation space of the drive gear assembly of the chain-free bicycle, and solve the shortcomings of the overall design coordination of the bicycle in the actual implementation of the space application, and improve the industrial utilization of the product.

2. It has improved assembly and manufacturing cost of the drive gear assembly of the chainless drive bicycle, and improves the economic efficiency of the product.

3. The setting of the main transmission gear of the drive gear assembly of the chain-free transmission bicycle does not occupy the space of the frame rotation shaft, and the labor-saving effect that the main transmission gear is directly driven by the crank.

The creation feature of the present invention is that at least one turn of the main drive gear fixed to the crank bushing is provided on the structure of one side crank of the rotating shaft of the chainless bicycle, so as to be passive for assembling the passive shaft of the frame. Gear meshing, the main drive gear disposed on the crank structure The tooth surface is oriented away from the crank, and the setting of the main transmission gear does not occupy the space of the frame rotation shaft, and the main transmission gear is directly driven by the crank to save the labor saving effect.

1‧‧‧ shaft

2‧‧‧ crank

21‧‧‧ bushings

22‧‧‧Combination Department

23‧‧‧Fixed components

3‧‧‧Main transmission gear

31‧‧‧ tooth surface

4‧‧‧ frame

5‧‧‧Passive axis

51‧‧‧passive gear

6‧‧‧ Cover

Figure 1: This example of the creation of the crank (a).

Figure 2: This example of the creation of the crank (2).

Figure 3: Schematic diagram of the first diagram of the creation and the passive shaft assembly.

Figure 4: Schematic diagram of the second diagram of the creation and the passive shaft assembly.

Figure 5: The assembled view of the first picture of the creation and the frame hinge and the passive shaft.

Figure 6: A partial enlarged view of Fig. 5.

Figure 7: Another installation example of the passive shaft of the present creation.

Figure 8: A further embodiment of the passive shaft of the present creation.

Please refer to the creation example of the present invention shown in FIG. 1 and FIG. 2, which is characterized in that the structure of the one side crank 2 of the rotating shaft 1 of the chain-free driving bicycle (in the present drawing, the position of the sleeve 21 integrally formed by the crank is shown. To be exemplified, there is provided at least one main transmission gear 3 fixed to the crank 2 structure (such as the sleeve 21). The main transmission gear 3 can be a face gear or a bevel gear. ), the wrong gear, the Hypoid gear, and other types of transmission gears are selected and used as the example of the face gear in the description of the present invention for the passive shaft assembled to the cover 6. The driven gear 51 of the fifth gear is engaged (as in the embodiment shown in Figs. 6 to 8), and the tooth surface 31 of the main transmission gear 3 disposed in the structure of the crank 2 (e.g., the bushing 21) is oriented away from the crank 2. .

As shown in Fig. 1, the structure of the crank 2 (such as the sleeve 21) is on the previous embodiment. Forming the joint portion 22 for assembling the main drive gear 3, fixing at least one turn of the main drive gear 3 on the joint portion 22 with the fixing member 23 to a side of the joint portion 22 away from the crank 2, so that the crankshaft 2 is disposed on the crank 2 The tooth surface 31 of the main transmission gear 3 on the structure (such as the sleeve 21) faces away from the crank 2 for the meshing of the driven gear 51 of the passive shaft 5 assembled to the cover 6 (Fig. 3, Fig. 5) And the example shown in Figure 6).

The cover body 6 in which the driven shaft 5 and the driven gear 51 are assembled is assembled on the structure of the crank 2 with a central through-hole, and is fixed to the frame 4 with a predetermined portion of the cover 6 (as shown in Fig. 6). . A bearing may be provided on the rotating shaft 1 at a through hole in the center of the cover 6, and then fixed to the frame 4 with a predetermined portion of the cover 6 (as shown in Fig. 7). Further, the through hole at the center of the cover 6 can be directly fixed to the frame 4 (as shown in Fig. 8). The assembly method of the different covers 6 can be selected and implemented according to actual design requirements.

Please refer to FIG. 2 again for another embodiment of the present invention. The crank 2 structure (such as the sleeve 21) is integrally formed with at least one turn of the main transmission gear 3, which is integrally formed in the crank 2 structure (such as the sleeve 21). The tooth surface 31 of the main transmission gear 3 is oriented away from the crank 2 for the meshing of the driven gear 51 of the driven shaft 5 assembled to the cover 6 (as shown in Fig. 4).

The creation of this case can indeed achieve the following benefits:

(1) It can surely reduce and improve the installation space of the drive gear assembly of the chain-free bicycle, effectively solve the shortcomings of the space design being easily limited by the overall design of the bicycle, and fully improve the industrial utilization of the product.

(2) It can improve the assembly and manufacturing cost of the drive gear assembly of the chain-free bicycle, and effectively improve the economic efficiency of the product.

(3) The main drive that can truly reach the drive gear assembly of the chainless drive bicycle The setting of the gear does not occupy the space of the frame rotating shaft, and the labor-saving effect that the main transmission gear is directly driven by the crank.

The above embodiments are merely preferred embodiments for fully illustrating the creation of the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art based on the creation of the present technology are all within the scope of protection of the present invention.

2‧‧‧ crank

21‧‧‧ bushings

22‧‧‧Combination Department

23‧‧‧Fixed components

3‧‧‧Main transmission gear

31‧‧‧ tooth surface

Claims (2)

A crank structure of a chainless bicycle, which is composed of a crank, a main transmission gear and a cover body assembled with a passive shaft and a driven gear; the characteristic is: one side crank of the shaft of the chainless bicycle On the sleeve, integrally forming a joint for fixing the main transmission gear, and the main transmission gear fixed on the integrally formed joint portion of the crank sleeve is for the passive gear meshing of the passive shaft assembled to the cover body, and The cover body assembled with the passive shaft and the driven gear is assembled on the crank sleeve of the crank, and the cover body and the main transmission gear assembled with the passive shaft and the driven gear are all disposed on the crank sleeve to form a The overall crank structure. The crank structure of the chainless transmission bicycle according to claim 1, wherein the main transmission gear system provided on the crank is integrally formed on the sleeve portion of the crank structure.