TW201900501A - Derailleur - Google Patents

Abstract

An electronic rear derailleur comprises a drive unit, a gearbox, a base portion, and a derailleur portion. The gearbox comprises an elastic member, a first power gear, a second power gear, a first passive gear, and a second passive gear. The first power gear connects the drive unit. The force is transmitted from the first power gear to the second power gear through the elastic member. The second power gear meshes the first passive gear and the second passive gear. The first passive gear and the second passive gear are respectively used to make the relative rotation of the base portion and the derailleur portion between the gearbox. Whereby the chain of the bicycle can be toggled and the chain is engaged with different sprockets to achieve the purpose of shifting.

Description

Bicycle electric rear derailleur

The present invention relates to a rear derailleur, and more particularly to a bicycle electric rear derailleur for use in a bicycle.

The National Health Campaign has been deeply rooted in the hearts of the people and has actually spread to the whole society. Bicycles, commonly known as bicycles, are a very popular sport. They not only exercise, but also make the footprints far away and broaden their horizons to win thousands of books.

In response to different grades of terrain, bicycles are designed with a variety of sprocket wheels of different diameters. By switching the chain to engage different sprocket wheels, the purpose of shifting is achieved, and the desired power output can be achieved by appropriately amplifying the torque to adapt to various slopes. .

In order to be able to switch the chain to engage different sprocket wheels, a chain slinger is needed to move the chain. The traditional bicycle uses a purely mechanical principle to sway the chain. In recent years, bicycle sports have not only become popular, but also become a fashion. In order to give the driver a more pleasant and upgraded driving experience, it is an ideal way to upgrade the derailleur to motor power.

If the concept of the gear set is used to transmit the power of the motor, although it is ideal, if the derailleur is hit by an external force or is stuck by the mud and sand, the rotating joint is stuck, which may cause the gear assembly inside the derailleur to wear. Or even the occurrence of a broken tooth, resulting in inaccurate shifting of the derailleur, loss of the function of the displacement or even damage to the motor.

Accordingly, it is a primary object of the present invention to provide an electric rear derailleur for use in a bicycle to solve the above problems.

The object of the present invention is to provide a bicycle electric rear derailleur capable of dispersing improperly increased stress, avoiding gear damage, being sturdy and lightweight, ensuring smoothness of shifting and greatly improving the driving feeling of the bicycle.

The invention relates to a bicycle electric rear derailleur for dialing a bicycle chain, wherein the switching chain and one of the plurality of sprockets mesh with each other, and the sprocket wheels are concentrically fixed to the frame of the bicycle. The bicycle electric rear derailleur includes a gear box, a fixing portion, and a chain guide portion.

The gearbox includes a case, at least one elastic member, a first power gear, a second power gear, a first driven gear, and a second driven gear. The elastic member, the first power gear, the second power gear, the first driven gear, and the second driven gear are all disposed in the casing, and the first power gear is coupled to the driving unit. The first power gear and the second power gear are detachably connected by an elastic member to transmit power, and the first end of the elastic member is disposed on one of the first power gear and the second power gear, and the elastic force is used One of the second ends is detachably disposed on the other of the first power gear or the second power gear, and the first power gear transmits power to the second power gear through the elastic member.

The second power gear meshes with the first driven gear on one side and the second driven gear on the other side. The box body has a first perforation and a second perforation, the first perforation corresponds to the first driven gear, and the second perforation corresponds to the second driven gear.

The fixing portion is fixed to the frame, sleeved and axially connected to the first through hole, and is rotatable relative to the gear box, and the fixing portion has a first shaft connected to the first driven gear. The chain guide portion is capable of contacting the chain, is sleeved and axially connected to the second through hole, and is rotatable relative to the gear box, and has a second shaft connected to the second driven gear.

Wherein, the chain guide portion has at least one guide chain gear, the guide chain gear is adjacent to the sprocket and meshes with the chain, and the movement of the guide chain gear drives the chain to switch adjacent to the different sprocket. Therefore, rotating the fixing portion and the chain guide portion changes the relative position of the chain and the sprocket, so that the chain engages different sprocket wheels, thereby achieving the purpose of shifting.

Further, the gear box further includes a motor and a transmission mechanism, wherein the motor and the transmission mechanism are disposed in the casing, the power output shaft of the motor is coupled to the transmission mechanism, and the transmission mechanism is coupled to the first power gear to connect the first power gear to the Drive unit.

In addition, the first driven gear and the second driven gear can be designed as sector gears to reduce the weight of the parts.

Further, regarding the description of the elastic member, the first end of the elastic member may be fixed to the first power gear, and the second end of the elastic member may be detachably coupled to the second power gear. The first power gear has at least one positioning hole corresponding to the at least one elastic member, the second power gear includes a gear portion and an interlocking portion, the gear portion and the linking portion are concentrically combined, and the linking portion is evenly distributed with a plurality of interlocking grooves and a gear portion. Engaging with the first driven gear and the second driven gear.

The elastic member may further include a fixing portion, an elastic portion, and a locking portion, wherein the fixing portion is the first end, and the locking portion is the aforementioned second end. The fixing portion is fixed to the positioning hole, and the elastic portion is connected and extends from the fixing portion. Preferably, the locking portion has a plurality of structural turns and a long length, and the locking portion is connected and extends from the elastic portion, and the locking portion interferes with the interlocking portion. One of the slots in the slot. Therefore, when the stress excessively accumulates in the first power gear or the second power gear in the gear box, the locking portion of the elastic member slips out of the interlocking groove of the engaging portion and is stuck to the next interlocking groove, and the excessive concentrated stress It was thus dispersed.

Therefore, the bicycle electric rear derailleur provided by the present invention transmits power by connecting an elastic member between the first power gear and the second power gear, can disperse improperly increased stress, avoid gear damage, and Both the first driven gear and the second driven gear are designed as sector gears, so that the overall structure is firm and lightweight, and the structure can be combined with the motor drive unit to ensure smooth shifting, and can be greatly improved. The driving experience of the bicycle.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to FIG. 1. FIG. 1 is a schematic diagram showing the relationship between the bicycle electric rear derailleur 30 and the sprocket 14 of the present invention. The example shows a bicycle electric rear derailleur 30 and a sprocket 14 from the rear of the bicycle. The present invention relates to a bicycle electric rear derailleur 30 for dialing a bicycle chain 12 to switch the chain 12 and a plurality of sprockets. One of the sprocket wheels 14 is in mesh with each other, and the sprocket wheels 14 are concentrically fixed to the frame 16 of the bicycle. The bicycle electric rear derailleur 30 includes a gear case 32, a fixing portion 34, and a chain guide portion 36.

The gear box 32 is movably connected to the fixing portion 34 and the chain guide portion 36 respectively. The fixing portion 34 is fixed to the frame 16, and the figure is fixed to the other end of the frame 16 extending to the power output shaft of the sprocket 14. The chain guide portion 36 has at least A guide chain gear 3602, the guide chain gear 3602 is adjacent to the sprocket 14 and meshes with the chain 12, and the chain guide portion 36 is capable of contacting the chain 12 through the guide chain gear 3602, and two guide chain gears 3602 are provided in the drawing.

Please refer to FIG. 2. FIG. 2 is a schematic view showing the appearance of the bicycle electric rear derailleur 30 of the present invention. The fixed portion 34 and the chain guide portion 36 are connected to two different positions of the gear case 32, and the chain guide portion 36 has two guide chain gears 3602. The gear box 32 has a driving unit and various intermeshing gears, which can drive the fixing portion 34 and the chain guide portion 36, rotate the position of the movable connection gear box 32 as a shaft contact, and move the guide chain gear 3602. To shift the chain 12 to change the relative position of the chain 12 and the plurality of sprockets 14, the switching chain 12 engages different sprockets 14 for the purpose of shifting.

Please refer to FIG. 3A and FIG. 3B. FIG. 3A is a schematic view showing a part of the gears inside the gear box 32 of the present invention. Figure 3B is an exploded view of Figure 3A. The gear shown in FIG. 3A and FIG. 3B first excludes the driving unit and the gear directly related to the driving unit. Under the exclusion condition, the gear box 32 includes the casing 40, at least one elastic member 42, the first power gear 44, The second power gear 45, the first driven gear 46, and the second driven gear 48.

The elastic member 42, the first power gear 44, the second power gear 45, the first driven gear 46, and the second driven gear 48 are all disposed in the casing 40. The first power gear 44 is connected to the driving unit, the first end of the elastic member 42 is fixed to one of the first power gear 44 and the second power gear 45, and the second end of the elastic member 42 is elastically contacted with the first power gear 44. And the other power gear of the second power gear 45, the first power gear 44 transmits power to the second power gear 45 through the elastic member 42.

The second power gear 45 is meshed with the first driven gear 46 on one side, and the second driven gear 48 is engaged with the second driven gear 48 on the other side. As can be seen from FIG. 3B, the case 40 has a first through hole 4002h corresponding to the first driven gear 46 and a second through hole 4004h corresponding to the second driven gear 48. Among them, the first driven gear 46 and the second driven gear 48 are respectively sector-shaped gears, and the overall weight can be reduced without reducing the effect.

As shown in FIG. 1 and FIG. 2, the fixing portion 34 is fixed to the frame 16, sleeved and axially connected to the first through hole 4002h, and rotated relative to the gear box 32. The fixing portion 34 has a first shaft 50 connected to the first driven gear 46. . The chain guide portion 36 is capable of contacting the chain 12, is sleeved and axially coupled to the second through hole 4004h, and is also rotated relative to the gear case 32, and has a second shaft 52 coupled to the second driven gear 48.

Then, when the first power gear 44 rotates, the second power gear 45 is driven by the elastic member 42, and the elastic member 42 can disperse the stress concentrated instantaneously. The rotating second power gear 45 simultaneously rotates the first driven gear 46 and the second driven gear 48, and simultaneously rotates the fixed portion 34 and the chain guide portion 36. Since the fixing portion 34 is fixed to the frame 16, the combination of the two different direction components of the fixing portion 34 and the chain guide portion 36 can control the chain guide gear 3602 of the chain guide portion 36 to slide the chain 12 to the opposite chain. Wheel 14 to the correct position to achieve the purpose of shifting.

Please refer to FIG. 4A and FIG. 4B. FIG. 4A is a schematic view of the elastic member 42 and the power gear of the present invention. 4B is an enlarged view of the elastic member 42 and the second power gear 45 of the present invention. The first power gear 44 has at least one positioning hole 4402h corresponding to the at least one elastic member 42. The example has four elastic members 4 and four positioning holes 4402h. The second power gear 45 includes a gear portion 4502 and a linking portion 4504. The gear portion 4502 is concentrically coupled with the interlocking portion 4504. The interlocking portion 4504 is provided with a plurality of interlocking grooves 4504S, and the gear portion 4502 is meshed with the first driven gear 46 and the second driven gear 48. The elastic member 42 includes a fixing portion 4202, an elastic portion 4204, and a locking portion 4206. The first end of the elastic member 42 is a fixing portion 4202, and the second end of the elastic member 42 is a locking portion 4206. In the example of the figure, the elastic member 42 is fixed to the first power gear 44 by the fixing portion 4202, and the elastic member 42 is elastically and detachably coupled to the second power gear 45 by the elastic portion 4204.

The fixing portion 4202 is inserted to be fixed to the positioning hole 4402h, and the elastic portion 4204 is connected and extended from the fixing portion 4202. The locking portion 4206 is connected and extends from the elastic portion 4204. In the illustrated example, the elastic portion 4204 has four turning points for the self-fixing portion. 4202 extends to the carding portion 4206 because the plurality of transitions can be of sufficient length and have sufficient resiliency. The locking portion 4206 is disposed in one of the linking grooves 4504S. When the momentary stress experienced by the elastic member 42 is greater than the elastic force of the load, the locking portion 4206 will slide off the original linkage groove 4504S, and slide along the outer edge of the linkage portion 4504 to the next linkage groove 4504S, thus, the sudden increase Stress is released, reducing damage to the gears.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of a driving unit of the present invention. The driving unit of the present invention is a motor 60, such as the bicycle electric rear derailleur 30 described above, wherein the gear box 32 further includes a motor 60 and a transmission mechanism 62. The motor 60 and the transmission mechanism 62 are all disposed in the casing 40, and the motor 60 receives power to generate power, which may be, for example, from a battery. The power take-off shaft of the motor 60 is coupled to a transmission mechanism 62 that is coupled to the first power gear 44 to connect the first power gear 44 to the drive unit.

The transmission mechanism 62 has various implementation possibilities, including a worm wheel, a worm, and a plurality of gears in the drawings. Since the embodiment is various, but does not affect the technical features of the present invention, the transmission mechanism 62 can reliably activate the motor 60 driving unit in a small space. It can be transmitted to the first power gear 44, and will not be redundant here. The interlocking portion 4504 and the gear portion 4502 of the present invention may also be integrally formed.

Therefore, with the bicycle electric rear derailleur 30 provided by the present invention, the elastic member 42 is connected between the first power gear 44 and the second power gear 45 to transmit power, which can disperse improperly increased stress and avoid gear damage. And by adopting the design of the sector gear by the first driven gear 46 and the second driven gear 48, the overall structure is firm and lightweight, and the structure can be combined with the driving unit of the motor 60 to ensure the shifting. Smoothness, and can greatly enhance the driving experience of the bicycle.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

12‧‧‧Chapter

14‧‧‧Sprocket

16‧‧‧ frame

30‧‧‧Bicycle electric rear derailleur

32‧‧‧ Gearbox

34‧‧‧Fixed Department

36‧‧‧Chain section

3602‧‧‧Chain gear

40‧‧‧ cabinet

4002h‧‧‧first perforation

4004h‧‧‧second perforation

42‧‧‧Flexible parts

4202‧‧‧Fixed Department

4204‧‧‧Flexible Department

4206‧‧‧Card Department

44‧‧‧First power gear

4402h‧‧‧Positioning holes

45‧‧‧second power gear

4502‧‧‧ Gear Department

4504‧‧‧ linkage department

4504S‧‧‧ linkage slot

46‧‧‧First Passive Gear

48‧‧‧second passive gear

50‧‧‧First shaft

52‧‧‧Second shaft

60‧‧‧ motor

62‧‧‧Transmission mechanism

1 is a schematic view showing the relationship between the bicycle electric rear derailleur and the sprocket according to the present invention; FIG. 2 is a schematic view showing the appearance of the bicycle electric rear derailleur according to the present invention; FIG. 3A is a schematic view showing a part of the internal gear of the gear box of the present invention; Fig. 3A is a schematic view of the elastic member and the power gear of the present invention; Fig. 4B is an enlarged view of the elastic member and the second power gear of the present invention; and Fig. 5 is a schematic view of the driving unit of the present invention.

Claims (8)

A bicycle electric rear derailleur includes: a fixing portion is fixed to the frame; a guide chain portion can contact the chain; a box body including a gear box, and the gear box includes a first a power gear, a second power gear, at least one elastic member, a first driven gear, and a second driven gear; wherein the first power gear and the second power gear are detachably connected by the elastic member And transmitting a power, the first end of the elastic member is disposed on one of the first power gear and the second power gear, and the second end of the elastic member is detachably disposed on the other one a power gear or the second power gear, and the second power gear meshes with the first driven gear and the second driven gear, respectively; and a driving unit coupled to the first power gear and driving the first power The gear and the second power gear rotate. The bicycle electric rear derailleur according to claim 1, wherein the driving unit further comprises a motor and a transmission mechanism, the power output shaft of the motor is coupled to the transmission mechanism, and the transmission mechanism is coupled to the first power And a gear for actuating the first power gear and rotating the fixing portion and the chain guide portion relative to the casing. The bicycle electric rear derailleur according to claim 1, wherein the casing has a first perforation and a second perforation, and the fixing portion is disposed on one side of the first perforation, and is a shaft connecting the first driven gear to the other side of the first through hole; the chain connecting portion is disposed on one side of the second through hole, and connecting the second driven gear to the second by a second shaft The other side of the perforation. The bicycle electric rear derailleur according to claim 1, wherein the first driven gear and the second driven gear are both a sector gear. The bicycle electric rear derailleur according to claim 1, wherein the first end of the elastic member is fixed to the first power gear, and the second end of the elastic member is detachably coupled to the second Power gear. The bicycle electric rear derailleur according to claim 5, wherein the elastic member comprises a fixing portion, an elastic portion, and a locking portion, wherein the first power gear has a corresponding one of the at least one elastic member At least one positioning hole; the second power gear includes a gear portion and a linking portion, the gear portion is concentrically coupled to the linking portion, and the linking portion is evenly distributed with a plurality of interlocking grooves, and the fixing portion is fixed to the positioning hole. The elastic portion is connected and extends from the fixing portion, and the locking portion is connected and extends from the elastic portion, and the locking portion is detachably clamped to one of the linking grooves. The bicycle electric rear derailleur according to claim 1, wherein the chain guide portion has at least one guide chain gear, and the guide chain gear train meshes with the chain. The bicycle electric rear derailleur according to claim 6, wherein the linkage portion and the gear portion are integrally formed.