TW200930614A - Bicycle crank speed change sprocket module - Google Patents

Abstract

A bicycle crank speed change sprocket module includes a fixed star gear having a ratchet around its internal periphery, at least two planet gears and two chains pivotally coupled and axially disposed on both sides of a plate, and the plate is driven to rotate by a crank pedal, and the fixed star gear is engaged to the ratchets on the internal periphery of the planet gear and acted by the planet gear for a faster rotation; a freewheel sprocket freely and rotably coupled to the axle of the crank pedal and disposed proximate to the two chain wheels; and a ratchet disposed on the external periphery of the freewheel sprocket, a chain wound thereon, and the chain is engaged by at lest one chain gear, so that the rotary speed of the chain is much faster than that of the crank pedal for a speed change effect.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crank toothed disc set for a bicycle, and more particularly to a set of toothed discs which can make a chain rotation speed greater than a crank rotation speed. [Prior Art] As shown in the first section, a plan view of a bicycle outline structure generally includes a frame (u) pivoted before the frame (11), the rear wheel (12) (13), and the rear wheel ( 13) Rotating drive mounting (14). The transmission device (14) has a crank pedal G41) pivoted at a suitable position on the frame (11), and a front toothed disc (142) coupled with the crank pedal (141), which is fixed on the rear wheel (13) The rear sprocket wheel (143), and the chain (144) wound around the front and rear sprocket (142) (143), as shown in the second figure, is a conventional gear shifting design with variable speed effect. In a top view, the front sprocket (142) is changed from a single design to two different sized spurs (1421) (1422) for coaxial connection, or the rear sprocket (143) is made up of several different sized spurs ( 1431) (1432) (1433) (1434) (1435) Engaged, chain (144) wound around the front and rear spurs 042) (143) on the different sizes of the sprocket wheel to achieve the shifting function. Related to the technical aspect of the present invention is the above-mentioned front toothed disc which is acted upon by a crank pedal. In order to make the front toothed disc have a shifting effect, the conventional scheme is to connect a plurality of front sprocket wheels of different sizes and the number of teeth coaxially with the crank pedal, the crank pedal drives the front sprocket wheel to rotate, and controls the chain with a controller. Conversion between the front sprocket wheels. In any case, the speed of the crank pedal is equal to the speed of the front sprocket, which is equal to the speed of the key bar, and does not cause the speed of the chain to be faster than the speed of the crank pedal. SUMMARY OF THE INVENTION The main object of the present invention is to modify the front sprocket set so that the speed of the chain is faster than that of the 200930614 shank. • A bicycle crank shifting gear set consisting of: - a stationary star gear, a ratchet tooth formed on the inner circumference, a plate, a shaft hole is provided in the center of the plate, and one side of the plate is sleeved with the shaft hole - a sleeve, the shaft hole and the sleeve are provided for the crankshaft pivot (four); the flywheel toothed disc is pivoted on the sleeve, and the outer circumference forms a ratchet tooth; at least two planetary gears are axially disposed on the plate One side, the two planetary gears and the ratchet teeth of the upper hybrid wire; at least two sprocket wheels, coaxially with the three planetary gears, sigh between the plate and the flywheel sprocket; one at least one key wheel and the flywheel The chain of the toothed disc is the same as the chain of the tooth. [Embodiment] As shown in the third, fourth, and fifth figures, the crank gear shifting gear set of the bicycle of the present invention comprises: a sun gear (20), and a ratchet tooth (21) is formed on the inner circumference. a rear gear (22) is disposed on one side of the sun gear (20), and is fixed at a periphery of the sun gear (20) by a plurality of fixing members (221), and a shaft hole (222) is arranged at the center. Group (30), (please cooperate with the fourth and fifth figures at the same time), comprising a plate (31) having a smaller size than the inner diameter of the above-mentioned "Star gear (20), and a shaft hole (32) is disposed in the center of the plate (31); At least two planetary gears (33) (34) are axially disposed on one side of the plate (31), and a center of the two planetary gears (33) (34) and a center of the shaft hole (32) of the plate (31) In a straight line; part of the teeth of the two planetary gears (33) (34) protrudes from the plate (31), and the ratchet gear (21) of the above-mentioned sun gear (20) is engaged; at least two transmission gears (35) ( 36) meshing with the two planetary gears (33) (34), respectively, axially disposed on the side of the plate (31); at least two sprocket wheels (37) (38), and the two transmission gears (35X36) Coaxially disposed on the other side of the plate (31), the plate (31) is provided with a bushing (39) on the same side of the two transmission gears (35) (36) at the shaft hole (3'2) 200930614. A flywheel disk (40) is sleeved on the sleeve (39) with a ratchet tooth (41) on the outer circumference; a starter wheel (50) is pivotally mounted on the sleeve on the flywheel (4 inch) On the outside, the outer circumference has a ratchet cymbal (51). As shown in the sixth and seventh figures, the combination of the upper opening member is pivotally fixed to the shaft tube (61) of the conventional bicycle crank pedal (60) by the shaft hole (222) of the rear gear (22), which is a stationary member. . The inner shaft (62) of the crank pedal (6〇) is fixed in the shaft hole (32) and the sleeve (39) of the plate (31), and each end is engaged with a crank® (63乂63'). The crank (63) is further fixed to the starting wheel (50) by a fixing member (631), so that the crank (63) can drive the starting wheel (50) and the plate (31) to rotate. A conventional bicycle key strip (70) can be chained to the starter wheel (50) or the flywheel sprocket (40) under the control of a conventional bicycle front shifting device (not shown). When the chain (70) is chained to the flywheel (4 turns), the flywheel (40) is in fact toothed with at least one of the sprockets (37) (38). The above-mentioned plate (31) is driven by the crank (63), and since the plate (31)-side two planetary gears (33) (34) are sprayed with the ratchet teeth (21) of the strange star gear (20), the planet The gear (33) (34) will undergo a revolution (rotation around the constant star gear (20)) and an action of rotation. Since the two transmission gears (35) (36) mesh with the planetary gears (33) (34), respectively, the planetary gears (33) (34) rotate to rotate the transmission gears (35) (36); The wheel (37) (38) is coaxial with the transmission gear (35) (36), so that the two sprocket wheels (37) (38) are also driven, and the chain (7 〇) to which the frame sleeve is attached is The rotating, rotating chain (70) further drives the flywheel (40), and the flywheel (4〇) is used to provide the inertial force of the chain (7〇) and maintain the shape of the chain (70) . As shown in Figures 8A, 8B, and 8C, the present invention has at least two sprocket wheels (37) (38), and two shafts of the 200930614 sprocket (37) 4 (38) and the shaft hole of the above plate (31) (32) The center is in a straight line, with a sprocket (37) or (38) tangled with the key strip (70). As shown in Fig. 9A, the two sprocket wheels (37) (38) which are turned to the twelve o'clock and six o'clock directions are both engaged with the chain (70). As shown in Figure IX, the two sprocket wheels (37) (38) at the three o'clock and nine o'clock directions are engaged with the chain (70) at the three o'clock direction. As shown in the ninth C, the two sprockets (37) (38) at about ten o'clock and four o'clock have a sprocket (37) in the four o'clock direction that meshes with the chain (70). The open structure and actuation of the present invention will cause the chain (7〇) to rotate at a speed greater than the ® speed of the crank pedal (6〇). For the sake of explanation, 'we assume that the sun gear (20) is 48 teeth, the planetary gears (33) (34) are 20 teeth, the transmission gear (35) (36) is 12 teeth, and the sprocket (37) (38) is 1 inch. tooth. When the crank pedal (6〇) rotates one turn and the planetary gear (33) (34) revolves around the sun gear (20) for one revolution, it rotates about 2.4 turns, and the transmission gear (35) (36) rotates about 3.8 turns. 5圈。 The sprocket (37) (38) also rotated about 3. 8 laps. The sprocket (37) (38) rotates at a higher speed than the crank pedal (60), and the speed of the chain (70) driven by the sprocket (37 χ 38) is greater than the rotational speed of the crank pedal (10), thereby increasing the vehicle speed. Once the rotational speed of the planetary gear set (30) reaches a certain level, inertia is generated. With the flywheel (4〇), the crank pedal (60) is more labor-saving. The upper open chain (70) is switched over the starter wheel (50) or the flywheel (4 turns) by a conventional shifting switching device (not shown). When the above-mentioned starting wheel (5〇) is usually stepped on the crank pedal (60) at a low rotation speed or the chain (7〇) is driven from a stationary state, the user can step on the crank pedal more slowly and labor-savingly. (6〇), once the chain (7〇) and the planetary gear set (3〇) reach the fixed speed, the key strip (10) can be switched to the flywheel (10) and the key wheel (37) (38). ), and the speed of the chain (70) can be improved to achieve the effect of shifting. 8 200930614 In addition to being used in bicycles, the structure of the case can also be applied to vehicles such as electric two-wheelers, scooters or other applications. Although the present case is described in terms of a preferred embodiment, those skilled in the art can make various changes in the form without departing from the spirit and scope of the present invention. The above embodiments are only used to illustrate the present case and are not intended to limit the scope of the present invention. Any modification or change that is not in violation of the spirit of the case is the scope of patent application in this case. [Simple description of the diagram] ® The first figure is a side view of the overall outline of the bicycle. The second figure is a schematic top view of a conventional bicycle front and rear derailleur. The third figure is an exploded perspective view of the shifting tooth plate of the present invention. The fourth figure is a front view of the combination of the planetary gear set and the sun gear in the shifting gear set of the present invention. The fifth drawing is a rear view of the combination of the planetary gear set and the sun gear in the shifting gear set of the present invention. The sixth figure is a sectional view of the combination of the shifting gear set of the present invention mounted on the bicycle crank pedal, and the key strip is pivoted on the starting wheel. Fig. 7 is a sectional view showing the combination of the shifting gear set of the present invention mounted on a bicycle crank pedal, in which the chain is pivoted on the flywheel sprocket and the sprocket. Figure 8A is a diagram of the 8A-8A section in the seventh figure and the shifting of the shifting toothed disc of the present invention. The eighth figure B is a schematic diagram of the action of the shifting gear to drive the chain to rotate according to the eighth drawing. The eighth C diagram is a schematic diagram of the action of the shifting gear to drive the chain to rotate according to the eighth b diagram. 200930614 ❹ [Main component symbol description] 20-blame star gear 38-sprocket 21_ ratchet tooth 39_draw sleeve 22-rear stop 40-flywheel toothed disc 221-fixing element 41-ratchet tooth 222-shaft hole 50-starter wheel 30-Pearl toothed disc set 51 - Ratchet teeth 31 - Plate 60 - Crank pedal 32 - Shaft hole 61 - Outer shaft tube 33 - Planetary gear 62 - Internal draw 34 - Planetary gear 63, 63' - Crank 35 - Transmission gear 631 - Fixing element 36-transmission gear 70-chain 37-sprocket

Claims (1)

200930614 X. Patent application scope: 1. A bicycle crank shifting gear set, the center of which is provided for the crankshaft of a bicycle to be pivoted, and the crankshaft is driven by the cranks at both ends thereof - the outer shaft Rotating in the tube; the shifting-toothed disk set further drives a chain, which is controlled by a front shifting switching device to be switched on two adjacent toothed discs; the shifting toothed disc comprises: - a comet gear' a ratchet tooth is disposed on the inner circumference, and the center is provided for the crank shaft to pass through, but is a non-moving member that does not rotate with the crank shaft; a plate, the center pivotally fixed to the crank shaft, and is a member that rotates with the crank shaft; at least two The planetary gears are axially disposed on one side of the plate, and the planetary gears mesh with the ratchet teeth of the sun gear; at least two sprocket wheels having a smaller number of teeth than the two planetary gears and axially disposed on the other of the plates a side, and is rotated by the action of the two planetary gears, and the rotation speed is greater than the rotation speed of the planetary gear; the flywheel toothed disc is rotatably pivotally mounted on the crankshaft and adjacent to the two-key wheel; The toothed disc is provided with a ratchet tooth 'for the above-mentioned chain case, and is at least spliced by a sprocket of the above. 2. If you apply for a patent range! The crank shifting gear disc of the present invention further comprises at least two transmission gears having fewer teeth than the planetary gears, and respectively meshing with the two planetary gears to be axially disposed on a side of the plate; the two sprocket wheels and the two transmissions The gear rotates coaxially. 3. The crank shifting toothed disc of claim 3, further comprising a moving wheel, the central pivot sleeve being fixed to the crank shaft and adjacent to the flywheel toothed disc, the key strip being detachable by the front shifting device Control, by the above-mentioned flywheel sprocket switch chain sleeve on the starting wheel. 4. The crank gear shifting disc of claim i, wherein the size of the plate is smaller than the inner diameter of the sun gear of the above 11 200930614. 5. The crank shifting gear according to claim 4, wherein the soil edges of the two planetary gears protrude from the plate, and the ratchet teeth of the sun gear are sprayed. 6. The crank shifting gear according to claim 1, further comprising a rear support, the solid gear being provided with the opposite side of the plate. The crank shifting sprocket according to claim 6, wherein the rear sowing center μ-suction hole is fixed to the outside of the outer shaft tube to make the above-mentioned strange star gear a stationary member. The crank shifting gear according to claim 1, wherein a center of the two planetary wheels is aligned with a center of the crankshaft. 9. The crank shifting sprocket according to claim 1, wherein the center of the two sprocket wheels is aligned with the center of the crankshaft. 10. A crankshaft shifting gear set of a bicycle, wherein a center of the shifting gear set is threaded by a crankshaft of a bicycle, the crankshaft being driven by a crank at both ends thereof for rotation in an outer shaft tube; The gear set is more driven-chain'. The chain is controlled by the front shifting device and can be switched on two adjacent toothed discs; the shifting gear includes: a sun gear, a ratchet tooth on the inner circumference, and a center for the above The crankshaft passes through, but is a stationary component that does not rotate with the crankshaft; a plate pivotally fixed to the crankshaft as a component that rotates with the crankshaft; to; a planetary gear is axially disposed on the crankshaft One side of the plate, the planetary gear is sprayed with the ratchet gear of the above-mentioned sun gear; at least two sprocket wheels having a smaller number of teeth than the above two planetary gears are axially disposed on the other side of the plate, 12 200930614 and subject to the second The planetary record is rotated by the job, and the turning degree is large _ the rotational speed of the planetary record; the flywheel sprocket is rotatably mounted on the crank shaft and adjacent to the two sprocket wheels; the flywheel sprocket is externally spurred 'On the ship's _ set on it, Lang彡 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The money and the starting wheel are replaced by a key sleeve. 11. If the crank shifting gear plate described in item 1Q of the special application is further included, the number of the at least two teeth is less than the transmission secret of the above-mentioned row of wheels, and the above two planets can be placed on the side of the board (10). The two sprocket wheels rotate coaxially with the two transmission gears. 12. The crank shifting sprocket of claim 1, wherein the size of the plate is smaller than the inner diameter of the sun gear. 13. The crank gear shifting plate according to item 12 of the Shen Qing patent scope, wherein the teeth of the two planetary gears are convex ihji, and the side of the red star is ratcheted. 14. The crank shifting gear according to claim 1 further comprising a rear load fixed to the sun gear with the opposite side of the plate. 15. The crank shifting gear according to claim 14, wherein the rear center is provided with a shaft hole, and the pivot sleeve is fixed outside the outer shaft tube, so that the above-mentioned sun gear becomes a stationary member. The crank shifting toothed disc of claim 1, wherein the center is aligned with the center of the crankshaft. 17. The crank shifting sprocket according to the first aspect of the invention, wherein the center of the two-key wheel is aligned with the center of the crankshaft. 13