TWI579194B - Drive transmission capable of multi-speed gear-shifting by reverse rotation - Google Patents

Description

Stepping over the multi-stage shifting internal transmission

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a reverse stepping multi-speed shift internal transmission, and more particularly to a reverse step multi-step shifting device suitable for being mounted on a bicycle and capable of performing a shift operation of a plurality of gear positions by pedal-driven crank reversal. transmission.

With the rise of awareness of environmental protection, living, fitness and depletion of natural resources, more and more people have replaced bicycles with the advantages of pollution-free, natural resources and sports and fitness to replace energy consumption. A steam locomotive that causes pollution.

Most of the currently available variable speed bicycles use the lever of the external transmission to move the chain to engage the different sizes of the sprocket to achieve the shifting function. Although an internal transmission mounted on a bicycle hub has been disclosed, it is possible to perform high and low speed shifting operations by pedaling the reversing of the sprocket; however, since such an internal transmission mechanism usually has only Do two shifts of speed, or have complex mechanisms, high costs, and the response to shifting operations is not fast enough, and there is room for further improvement.

A first object of the present invention is to provide a reverse stepped multi-speed shift internal transmission, which can perform shifting operation of at least two stages by pedal-driven crank reversal, and has a simple mechanism, low cost, and The speed of the shift operation is really good.

In order to achieve the above purpose, the reverse stepping multi-speed shifting internal transmission of the present invention A preferred embodiment includes: a drive shaft coupled to a power input end and capable of being driven by the power input end for forward and reverse movement on the drive shaft and disposed along an axis a plurality of pawl receptacles extending from the center; a shifting shaft center disposed parallel to the drive shaft and spaced apart by a predetermined distance; a shifting gear set unit including a plurality of transmission gears and a plurality of shifting gears; the plurality of transmission gear trains The plurality of shifting gears are sleeved on the shifting shaft and are correspondingly engaged with the plurality of transmission gears; and a shifting cam assembly unit includes at least one cam and a plurality of shaft pivots a claw and a shift control pawl; the at least one cam and the plurality of shaft pawls are sleeved on the drive shaft, and the plurality of shaft pawls are synchronously rotated in conjunction with the drive shaft; the plurality of shaft spines The claws are respectively accommodated in the plurality of pawl receptacles and are individually switchable between a retracted position and a jacked position by the control of the rotation of the at least one cam; the shift control pawl is adjacent to The at least one cam a side, and corresponding to the reverse movement of the drive shaft to abut one of the at least one cam to perform a rotational movement relative to the drive shaft to control the positional switching of the plurality of spindle pawls Operation, wherein the plurality of spindle pawls respectively have a brake tooth, and the positions of the brake teeth of each of the spindle pawls correspond to one of the plurality of transmission gears respectively; when a certain axis pawl When in the jacking position, the crank teeth of the jacking pawl will be pressed against the corresponding transmission gear and will be rotated by the drive shaft during forward rotation, as for the other Gear teeth corresponding to the pivoting pawl of the retracted position The wheel will not be directly driven by the drive shaft during forward rotation; and a transmission base is coupled between a power output end and the plurality of transmission gears, and can be rotated by the plurality of transmission gears to be positive Turning rotational power output to the power output end; wherein the transmission gear rotated by the transmission shaft is matched with one of the plurality of transmission gears meshed with the corresponding transmission gear to determine the transmission base The rotational speed, therefore, the rotational speed of the drive base also changes when the drive gear that is rotated by the drive shaft changes.

In a preferred embodiment, the plurality of transmission gears of the multi-step shifting internal transmission includes a first transmission gear, a second transmission gear, and a third transmission gear; the first transmission gear train is combined and interlocked The transmission base is driven by the first transmission gear to rotate directly; and the inner ring portion of each of the transmission gears is respectively provided with a plurality of abutting recesses that can be unidirectionally detached. The plurality of transmission gears abut against the recess can be driven by the braking teeth being abutted when the corresponding braking teeth are in the jacking position and when the transmission shaft is rotating forward. The plurality of shifting gears includes a first shifting gear, a second shifting gear, and a third shifting gear, respectively meshing with the first, second, and third transmission gears. The at least one cam includes a first axial fixed piece, a shift control cam, and a second axial fixed piece; the first and second axial fixed pieces are fixed on the transmission shaft and rotate in conjunction therewith The shift control cam is sleeved on the drive shaft in a relatively slidable manner and is sandwiched between the first and second axial fixed pieces. The number of shift control pawls is only one, and there is no structure for providing a cam block on one of the outer ring portions of the first and second axial fixed pieces. One of the outer ring portions of the shift control cam is provided with a plurality of abutting lugs, and the shift control convex One of the inner ring portions of the wheel is provided with a plurality of inner recesses. The plurality of spindle pawls include a first pivot pawl, a second pivot pawl and a third axial pawl; each pivot pawl respectively includes the brake tooth and a switching tooth, and each axle The brake teeth of the heart pawl and the switching teeth are synchronously switched between the retracted position and the jacking position. The position of the braking teeth of the first shaft pawl corresponds to the inner ring portion of the first transmission gear, and the position of the braking teeth of the second shaft pawl corresponds to the inner ring portion of the second transmission gear. And the position of the braking teeth of the third shaft pawl corresponds to the inner ring portion of the third transmission gear. In addition, the position of the switching teeth of each of the pivot pawls corresponds to the inner ring portion of the shift control cam, and the position of a certain concave portion of the shift control cam corresponds to the switching of a certain axial pawl. When the position of the tooth is located, the switching tooth of the corresponding spindle pawl can be inserted into the corresponding concave portion thereof, so that the braking teeth of the corresponding spindle pawl are simultaneously jacked up and switched to the jacking Position; in contrast, when the position of the switching tooth of a certain axis pawl does not correspond to the position of any of the inner recesses, the pivot pawl is in the retracted position. The shift control pawl is switchable between a slip-off state and an abutment state; the shift control pawl position corresponds to the shift control cam outer ring portion; when the pedal is advanced (the drive shaft 10 When the forward rotation is performed, the shift control pawl may be in the slipping state and cannot withstand the abutment protrusion of the outer ring portion of the shift control cam, and the change is when the pedal is reversed (the drive shaft 10 is reversed) The gear control pawl will be in the abutment state and thus bear against the abutment tab of the shift control cam.

In a preferred embodiment, the number of teeth of at least two of the first, second, and third transmission gears of the reverse stepped multi-speed shift transmission of the present invention is different. The number of teeth of at least two of the first, second, and third shifting gears is different. The shift control cam has a plurality of top bumps The number of the recesses is six, and the number of the inner recesses of the shift control cam is two.

In order to enable the reviewing committee to have a further understanding and understanding of the features, objects and functions of the present invention, the following detailed description is provided with reference to the drawings: Referring to Figures 1 to 8C, the reverse stepping multi-step shifting of the present invention is disclosed. A preferred embodiment of the internal transmission 1. 1 is a perspective exploded view of a preferred embodiment of the reverse multi-speed shifting internal transmission 1 of the present invention in a first viewing angle; FIG. 2 is a preferred embodiment of the reverse multi-speed shifting internal transmission 1 of the present invention. FIG. 3 is a right side view of the preferred embodiment of the reverse multi-speed shifting internal transmission 1 of the present invention in a combined state; FIG. 4 is a cross-sectional view of the AA shown in FIG. 3 (including a crank 91 and The tooth piece 92); FIG. 5 is a perspective view of the reverse shift multi-stage shifting internal transmission 1 in the combined state (excluding the bead bowl 681, the jade 682 and the second fixed seat); FIG. 6A, 6B and 6 C is a side view of the first, second and third transmission gears 31, 32, 33 of the reverse multi-speed shifting internal transmission 1 of the present invention; respectively, FIGS. 7A, 7B and 7C are the reverse steps of the present invention, respectively. A side view of the first axial fixed piece 41, the shift control cam 42 and the second axial fixed piece 43 of the multi-speed shift internal transmission; FIGS. 8A, 8B and 8C are respectively the reverse step multi-step shift of the present invention A perspective view of the first, second and third axial pawls 44, 45, 46 of the internal transmission.

As shown in FIG. 1 to FIG. 5, a preferred embodiment of the multi-step shifting internal transmission 1 of the present invention can be installed in a frame of a bicycle (not shown), and is particularly suitable for being installed. Used to set up the pedal crank 91 (Crank) The position of the five-way pipe of the frame of the mandrel. The reverse stepping multi-speed shift internal transmission 1 of the present invention can perform the shifting operation of at least three-speed shifting by the pedal driving crank 91 reverse (that is, stepping on the pedal). In the embodiment, the reverse step multi-speed shift internal transmission 1 includes: a transmission shaft 10, a shifting shaft 20, a shifting gear unit 30, a shifting cam assembly unit 40, and a transmission base 50. a first fixing seat 61, a second fixing seat 62, two needle rollers 63, 64, a ball ring 65, a tooth holder 66, a support frame 67, a bead bowl 681 and a jade 682 .

The drive shaft 10 is coupled to a power input end and is capable of being driven by the power input to perform forward and reverse movements. In this embodiment, the power input end is the two cranks 91 of the bicycle. A plurality of pawl receiving seats 101, 102, 103 extending along an axis are disposed on the outer surface of the driving shaft 10, and are respectively provided at the two ends of the driving shaft 10 in combination with the crank 91. Square head. In the embodiment, the plurality of pawl receiving seats include a first pawl receiving seat 101, a second pawl receiving seat 102, and a third pawl receiving seat 103. Each of the pawl accommodating seats 101, 102, and 103 is an elongated shallow groove-like structure extending in the axial direction, and each of the pawl accommodating seats 101, 102, and 103 is substantially equidistantly spaced from each other.

The shifting shaft center 20 is disposed parallel to the transmission shaft 10 and spaced apart by a predetermined distance. The shifting gear unit 30 includes a plurality of transmission gears 31, 32, 33 and a plurality of shifting gears 34, 35, 36. The plurality of transmission gears 31, 32, 33 are sleeved on the transmission shaft 10, and the plurality of transmission gears 34, 35, 36 are sleeved on the shifting shaft 20 and respectively coupled to the plurality of transmission gears 31, 32. 33 is correspondingly engaged.

Please refer to Figure 1, Figure 2 and Figure 4 together with Figure 6A and Figure 6B. Figure VI C. In the embodiment, the plurality of transmission gears include a first transmission gear 31, a second transmission gear 32, and a third transmission gear 33. The first, second, and third transfer gears 31, 32, and 33 are not fixed together but may be rotated asynchronously. The first transmission gear 31 is coupled to the slot 501 of the transmission base 50 by a plurality of latches 313, so that the first transmission gear 31 is interlocked with the transmission base 50, so that the transmission base 50 is subjected to the first The transmission gear 31 is directly driven to rotate synchronously. Further, one of the inner ring portions 311, 321, and 331 of each of the transmission gears 31, 32, and 33 is provided with a plurality of abutting recesses 312, 322, and 332 which are slidable in one direction. The plurality of transmission gears 31, 32, 33 abut against the recesses 312, 322, 332 can be received by the brake teeth 441, 451, 461 in their upright position and when the drive shaft 10 is rotated forward. One of the 441, 451, and 461 is driven by the top, and when the drive shaft 10 is reversed, the brake teeth 441, 451, and 461 are slipped off and not driven. The plurality of shifting gears includes a first shifting gear 34, a second shifting gear 35, and a third shifting gear 36 that are respectively meshed with the first, second, and third transfer gears 31, 32, 33, respectively. In the present embodiment, the first, second, and third shifting gears 34, 35, 36 are all rotated in synchronization with the shifting shaft center 20. Moreover, at least two of the first, second, and third transmission gears 31, 32, 33 have different numbers of teeth, and at least one of the first, second, and third transmission gears 34, 35, 36 The number of teeth of the two shifting gears is different. In this embodiment, the number of teeth of the second transmission gear 32 is greater than that of the first transmission gear 31, and the number of teeth of the first transmission gear 31 is greater than the number of teeth of the third transmission gear 33; moreover, the number of teeth of the third transmission gear 36 is greater than The first shifting gear 34, and the number of teeth of the first shifting gear 34 is larger than the second shifting gear The number of teeth of 35.

Referring to FIGS. 1 to 5 , the shift cam assembly unit 40 includes at least one shift control cam 42 , two axial fixed pieces 41 , 43 , a plurality of axial pawls 44 , 45 , 46 and a shift control pawl . 47. The at least one shift control cam 42 , the two axial fixed pieces 41 , 43 and the plurality of axial pawls 44 , 45 , 46 are sleeved on the transmission shaft 10 , and the plurality of axial pawls 44 , 45 , The 46 series rotates synchronously with the drive shaft 10 . The plurality of spindle pawls 44, 45, 46 are respectively received in the plurality of pawl receptacles 101, 102, 103 on the drive shaft 10 and are controllable by the rotation of the at least one shift control cam 42 The switch is individually switched between a retracted position and a jacked position, and thus may also be referred to as a "axis control element", meaning a control element disposed on the shaft center. In the present invention, the number of the shift control pawls 47 is only one and is adjacent to the side of the at least one shift control cam 42 and the two axial fixed pieces 41, 43. The shift control pawl 47 can abut the shift control cam 42 to perform a rotational movement relative to the drive shaft 10 to control the plurality of pivot pawls 44, corresponding to the reverse movement of the drive shaft 10 45, 46 position switching operation. Wherein, the plurality of spindle pawls 44, 45, 46 respectively have a brake tooth 441, 451, 461, and the positions of the brake teeth 441, 451, 461 of the pivot pawls 44, 45, 46 correspond to the respective The inner ring portions 311, 321, 331 of one of the plurality of transmission gears 31, 32, 33 of the transmission gears 31, 32, 33. Brake teeth 441 (or 451, or 461) of the jacking pawl 44 (or 45, or 46) when a pivot pawl 44 (or 45, or 46) is in the jacked position Will abut against the abutment recess 312 on the inner ring portion 311 (or 321 or 331) of the corresponding transmission gear 31 (or 32, or 33). (or 322, or 332) and will be rotated by the drive shaft 10 during forward rotation, as the other transmission gears corresponding to the spindle pawl located in the retracted position will not be driven by the transmission shaft 10 It is directly driven during the forward rotation, but it is possible to transmit the rotational power to the transmission base 50 by the first transmission gear 31 after the transmission and the shifting of the plurality of shifting gears 34, 35, 36.

For example, when the first pivot pawl 44 is in the jacking position, the other two pivot pawls 45, 46 are now in the retracted position; at this time, the drive shaft 10 will be directly in the forward rotation. The first transmission gear 31 is driven to transmit the rotational power to the blade holder 66 via the transmission base 50, while the other two transmission gears 32, 33 are in a non-transmission state. When the second pivot pawl 45 is in the jacking position, the other two pivot pawls 44, 46 are in the retracted position; at this time, the drive shaft 10 will directly drive the second when it is rotated forward. The transmission gear 32 transmits the power to the second shift gear 35 meshed therewith, and then transmits the power to the first shift gear 34 synchronized with the second shift gear 35 through the shift shaft 20, and then The rotational power is transmitted to the first transmission gear 31 meshing with the first shift gear 34, and the rotational power is transmitted to the blade holder 66 via the transmission base 50, while the third transmission gear 33 is in a non-transmission state. Moreover, when the third pivot pawl 46 is in the jacking position, the other two pivot pawls 44, 45 are in the retracted position; at this time, the drive shaft 10 will directly drive the first rotation. The three transmission gears 33 transmit the power to the third shifting gear 36 meshing therewith, and then transmit the power to the first shifting gear 34 that rotates synchronously with the third shifting gear 36 through the shifting shaft core 20, Then transmit the rotary power to the first A shifting gear 34 meshes with the first transmission gear 31, thereby transmitting rotational power to the blade holder 66 via the transmission base 50, while the second transmission gear 32 is in a non-transmission state. Thereby, the three-step shifting function of controlling the rotation speed of the output shaft by changing the rotation of the shaft pivots 44, 45, 46 to the jacking position by the reverse rotation of the transmission shaft 10 can be achieved.

Please refer to Figure 1 and Figure 2 together with Figure 7A, Figure 7B and Figure 7C. In the present embodiment, the shift cam assembly unit 40 includes a first axial fixed piece 41, a shift control cam 42, and a second axial fixed piece 43. The first and second axial fixing pieces 41, 43 are fixed to the transmission shaft 10 and rotate in conjunction therewith, but the first and second axial fixing pieces 41, 43 can be along the transmission shaft. A slight (typically less than 0.5 mm) axial positional shift is made in the axial direction of the heart 10. In one embodiment, a reset reed can be added to the side of the first axial fixed piece 41 away from the shift control cam 42 and the side of the two-axis fixed piece 43 that is farther away from the shift control cam 42 ( The two return springs abut against the outer side surfaces of the first and second axial fixing pieces 41, 43 respectively, and provide an elastic pressure to press the two axial fixing pieces 41, 43 toward each other. Shift control cam 42 to push it back to the original position after the first (or second) axial fixing piece 41 (or 43) is axially displaced, that is, to press it back against the shift control cam The original location of 42. The shift control cam 42 is sleeved on the drive shaft 10 in a relatively slidable manner and is interposed between the first and second axial fixed pieces 41, 43. A plurality of abutting protrusions 421 are disposed on one outer ring portion of the shift control cam 42 , and a plurality of inner concave portions 422 are disposed in one inner ring portion of the shift control cam 42 . In the present invention, the outer ring portions of the first and second axial fixing pieces 41, 43 are not provided with any cam block knots. In other words, the outer ring portions of the first and second axial fixing pieces 41, 43 exhibit a simple circular contour, so that the shift control pawl 47 is both positive and negative when the transmission shaft 10 is rotated. The outer ring portions of the first and second axial fixing pieces 41, 43 are not caught at all. Further, the plurality of abutting projections 421 on the outer ring portion of the shift control cam 42 protrude outside the outer ring portions of the first and second axial fixed pieces 41, 43. In this embodiment, the number of the plurality of abutting projections 421 of the shift control cam 42 is six, and a valley between any two adjacent abutting projections 421 is provided for the shift control pawl 47. The end is embedded and abuts against the side wall of the abutting projection 421, and the number of the plurality of inner recesses 422 of the shift control cam 42 is two.

Please refer to Figure 1 and Figure 2 together with Figure 8A, Figure 8B and Figure 8C. In this embodiment, the plurality of spindle pawls include a first pivot pawl 44, a second pivot pawl 45, and a third pivot pawl 46. Each of the pivot pawls 44, 45, 46 has a brake tooth 441 including the brake teeth 441, 451, 461 and a switching tooth 442, 452, 462, and an individual spindle pawl 44 (or 45, or 46) Or 451, or 461) and the switching teeth 442 (or 452, or 462) are synchronously switched between the retracted position and the jacked up position. The position of the braking teeth 441 of the first spindle pawl 44 corresponds to the inner ring portion 311 of the first transmission gear 31, and the position of the braking teeth 451 of the second spindle pawl 45 corresponds to the second transmission The inner ring portion 321 of the gear 32 and the position of the braking teeth 461 of the third shaft pawl 46 correspond to the inner ring portion 331 of the third transmission gear 33. In addition, the positions of the switching teeth 442, 452, 462 of the respective pivot pawls 44, 45, 46 are corresponding to the inner ring portion of the shift control cam 42, when the inner ring portion of the shift control cam 42 The position of an inner recess 422 corresponds to a certain axial pawl 44 (or 45, or 46) when the position of the tooth 442 (or 452, or 462) is switched, the switching tooth 442 (or 452, or 462) of the corresponding spindle pawl 44 (or 45, or 46) will be Pushing into the corresponding inner recess 422 and raising it to the jacking position, thereby synchronizing the braking teeth 441 (or 451, or 461) of the corresponding pivot pawl 44 (or 45, or 46) Lift up to switch to the jacking position. In contrast, when the position of the switching tooth 442 (or 452, or 462) of a certain spindle pawl 44 (or 45, or 46) does not correspond to the position of any of the inner recesses 422, the pivot pawl 44 (or 45, or 46) is in the retracted position. Each of the first, second, and third axial pawls 44, 45, 46 is provided with an elastic member (such as a torsion spring or the like) to enable the first, second, and third axial pawls 44, 45, 46. There is a tendency to switch to the jacking position when it is not affected by external force.

The shift control pawl 47 is switchable between a slipping state and an abutting state. The position of the shift control pawl corresponds to the outer ring portion of the shift control cam 42. When the drive shaft 10 rotates forward (that is, the pedal on the crank is stepped forward to advance the bicycle), the shift control pawl 47 is in the slip state, so the shift control pawl 47 cannot withstand the The shift control cam 42 is biased against any of the outer ring portions 421 so that no shifting operation occurs; and when the drive shaft 10 is reversed (that is, the crank is reversed to trigger the shifting operation), the change The gear control pawl 47 will abut against one of the shift control cams 42 against the projection 421 due to the reversal of the axis. In the present embodiment, the setting position and direction of the shift control pawl 47 is such that the shift control pawl 47 cannot withstand the abutment lug 421 when the shaft is rotating forward, but only when the shaft is When the heart is reversed, the top bump 421 can be resisted. And, the shift control pawl 47 is provided with an elastic element A member (for example, a torsion spring or the like) can cause the shift control pawl 47 to have a tendency to abut against the outer ring portion of the shift control cam 42 (i.e., switch to the abutment state) when it is not affected by an external force.

In the present embodiment, the shift control pawl 47 is only abutted against a certain abutment projection 421 of the shift control cam 42 only when the drive shaft 10 is reversed. Moreover, the shift control pawl 47 is also only applied when the shift control pawl 47 has abutted against a certain abutment projection 421 of the shift control cam 42 and the drive shaft 10 continues to reverse by a predetermined angle. The shift control cam 42 is rotated relative to the drive shaft 10 to cause the position of a certain inner recess 422 of the inner ring portion of the shift control cam 42 to be displaced to a certain axial pawl 44 (or 45, or 46). The switching teeth 442 (or 452, or 462) correspond to the position, thereby achieving the purpose of shifting and shifting operations. In addition, the plurality of inner ring portions 311, 321, 331 of the respective transmission gears 31, 32, 33 are provided with a plurality of unidirectional slip directions against the recesses 312, 322, 332, so that the transmission shaft 10 is reversed. When the first, second and third axial pawls 44, 45, 46 are in the jacked up position or the retracted position, the respective transmission gears 31, 32, 33 abut against the recesses 312, 322. , 332 are in a mutually slipping state, and the braking teeth 441 (or 451, or the braking teeth 441 (or 451, or 46) of the certain axial pawl 44 (or 45, or 46) in the jacking position are only brought when the driving shaft 10 is rotating forward. 461) Abuts against the abutment recess 312 (or 322, or 332) of its corresponding transmission gear 31 (or 32, or 33). In other words, when the transmission shaft 10 is reversed, only the shifting shift operation can be performed, and only when the transmission shaft 10 is rotating forward, the input power from the transmission shaft 10 is combined with the transmission gear 31. The drive base 50 is output. Briefly, the shift control cam 42 shown in FIG. 7B has a concave inner ring portion. The position of the rotation of the portion 422 relative to the drive shaft 10 determines the jacking or retracting state of the brake teeth 441 (or 451, or 461) of the first, second and third spindle pawls 44, 45, 46. . The position of the inner concave portion 422 is determined by the plurality of abutting projections 421 of the shift control cam 42 being rotated by a predetermined angle by the shift control pawl 47 to determine the shift position of the crank 91. The relative position of this fit is to achieve the function of allowing the crank 91 to have a shifting operation at a specific position.

Please refer to Figure 7A, 7B, and 7C again and match Figure 9. In the present invention, the first axial fixing piece 41 and the second axial fixing piece 43 are respectively provided with three arc-shaped sliding grooves 415 and 435 corresponding to the positions; and the first axial fixing piece 41 is used. The front end of an arcuate chute 415 in a forward direction corresponds to the trailing end of the corresponding arc chute 435 of the second axial fixing piece 43 and is spaced a small distance therefrom. In addition, at the position of the two ends of the arc-shaped sliding grooves 415, 435, at least one round hole 425 is respectively disposed on the shift control cam 42 , and a steel ball 426 is respectively disposed in each of the circular holes 425 . . The diameter of the steel ball 426 is equivalent to or slightly smaller than the inner diameter of the circular hole 425. Since the shift cam assembly 40 shown in FIG. 1 is engaged with the first, second and third pivot pawls 44, 45, 46, any of the pivot pawls 44, 45, 46 From the angle of opening (topping) to closing (retracting), there is an unstable zone in this section, and this unstable zone may cause a neutral phenomenon. In order to eliminate such an unstable region, the present invention is particularly shown in FIGS. 7A, 7B, 7C, and 9 in which the arcuate chutes 415, 435 are located in the circular holes 425. The cooperation of the steel balls 426 constitutes an additional ball mechanism. When the shift control cam 42 is opposite to the first and second axial fixed pieces 41, 43 When sliding, the steel balls 426 can slide in the arc chutes 415, 435, and after reaching the tail ends of the chutes 415, 435, the steel balls 426 can abut the first and second axial fixing pieces. 41, 43. Moreover, when the shift control cam 42 continues to rotate, the steel ball 426 will break through the arc chute 415 to the chute 435, and the other steel ball 426 will break through the arc chute 435 to the chute 415, thus, The steel ball 426 interacts with the chutes 415, 435 to push. This interactive push-through process assists the pivot pawls 44, 45, 46 in a quick opening and closing action. The shift control cam 42 cannot be stabilized during the pushing process, and escapes the opening and closing joint points of any of the internal shaft pawls 44, 45, 46, thereby eliminating the blurring interval of the shifting process. In this way, the phenomenon that the pawls collide can be avoided in the process of shifting the gear position, and there is no longer a neutral phenomenon in the shifting, and there is also a user who can feel the reverse step after shifting. The function of the feedback device for shifting.

As described above, in the present embodiment, the positions of the circular holes 425 need to be relative to the features of the plurality of concave portions 422 provided in the inner ring portion of the shift control cam 42 to make the first, second, and third The pivot pawls 44, 45, 46 can be smoothly opened or closed at the correct angle (this angle is the position corresponding to the inner recess 422). Also, the positions of the chutes 415, 435 are relative to the positions of the circular holes 425 such that the first, second and third axial pawls 44, 45, 46 cannot be positioned in the open and closed shifting process regions.

Please refer to FIGS. 10A to 10F and FIGS. 11A, 11B and 11C. These figures can further illustrate the cam 42 of the shift cam assembly unit 40 of the present case when performing the reverse shifting operation ( And fixing pieces 41, 43) and The mutual positional relationship between the shift control pawls 47 at different stages of operation, and how the steel balls 426 located in the round holes 425 of the shift control cam 42 are in the chute 415 and the second shaft of the first axial fixed piece 41 A displacement movement between the chutes 435 of the cardiac fixation piece 43 is made. 10A to 10F are the first axial fixed piece, the shift control cam and the second axial fixed piece shown in FIG. 9 respectively, and the shift control pawl is in each operation stage when the shifting operation is performed. Schematic diagram. Figures 11A, 11B, and 11C are relative positions of the steel ball and the chute, respectively, in the operational stages as shown in Figures 10C, 10D, and 10E.

As shown in FIG. 10A, when the pedal on the crank 91 is being stepped on to advance the bicycle (that is, the rotation of the transmission shaft 10 in the counterclockwise direction as shown in FIG. 10A is also called "forward rotation"), The first and second axial fixed pieces 41, 43 are also rotated counterclockwise together with the drive shaft 10. At this time, although both the shift control cam 42 and the drive shaft 10 are rotatable with each other, since the first and second axial fixed pieces 41, 43 are biased by the return spring to clamp the change The shift control cam 42 is so that when the shift control cam 42 is not biased by the shift control pawl 47 against the abutment projection 421, the shift control cam 42 will be fixed with the first and second axial centers 41, 43 The frictional forces on the contact surfaces of the two are driven together to rotate. Also, since the shift control cam 42 is rotated counterclockwise, the setting position of the shift control pawl 47 is continuously set as shown in FIG. 10A with the plurality of tops provided by the outer ring portion of the shift control cam 42. The bump 421 is continuously in a slipping state. In other words, when the bicycle is stepping forward (the drive shaft 10 is rotating forward), the shift control pawl 47 does not abut (engage) the abutment projection 421 of the shift control cam 42.

As shown in FIG. 10B, when the pedal on the crank 91 is stepped down (that is, the drive shaft 10 is rotated clockwise as shown in FIG. 10B, which is called "reverse"), the first and second The shaft fixing pieces 41, 43 are also rotated clockwise together with the drive shaft 10. At this time, the shift control cam 42 is also driven to rotate clockwise by the frictional force at the beginning until the shift control pawl 47 abuts against the outer ring of the shift control cam 42 as shown in FIG. 10B. Any one of the parts is placed against the bump 421.

As shown in FIG. 10C and FIG. 11A, when the reverse step is continued, the drive shaft 10 together with the first and second axial fixed pieces 41, 43 will continue to rotate clockwise, but the shift control cam 42 is topped. The projection 421 is subjected to the abutment of the shift control pawl 47 and cannot be rotated. In other words, the relative rotational movement of the shift control pawl 47 and the first and second axial fixed pieces 41, 43 will begin. At this time, the position of a certain steel ball 426 will gradually shift to the certain chute 435 of the second axial fixed piece 43 in the counterclockwise direction as the operation of the reverse rotation (the rotation of the drive shaft 10 is reversed). The end position is as shown in Figure XI. When the steel ball 426 is located at the trailing end of the chute 435 in the counterclockwise direction, as shown in FIG. 10C, the position of the switching tooth 442 of a certain axial pawl such as the first axial pawl 44 corresponds exactly to The shift control cam 42 is disposed in a certain inner recess 422 of the inner ring portion, so that the first pivot pawl 44 can be switched to the aforementioned jacking position; and at the same time, the other two pivot pawls 45 46 are located in the inward (slip) position.

In addition, by appropriately designing the relative relationship between the sliding grooves 415, 435 on the first and second axial fixing pieces 41, 43 and the phase angles of the extending directions of the two cranks 91, the steel ball 426 can be positioned in the sliding grooves 415, 435. in In the case of the trailing end in the counterclockwise direction (for example, the position shown in Fig. 10C and Fig. 11A), the extending angle of the two cranks 91 is almost exactly the state in which the bicycle frame or the ground plane extends horizontally (parallel). In other words, when the operation of the reverse shift is about to start, the two cranks 91 are almost horizontally extended, so the rider can easily step on the force to perform the shift.

As shown in FIG. 10D and FIG. 11B, if the stepping is continued, the transmission shaft 10 together with the first and second axial fixing pieces 41, 43 will continue to rotate clockwise again, but the shift control cam 42 However, since the abutting projection 421 is subjected to the abutment of the shift control pawl 47, it is still unable to rotate. At this time, as shown in FIG. 11B, the steel ball 426 will slide out of the tail end of the sliding groove 435 of the second axial fixing piece 43 which is originally located, but has not yet reached the adjacent first axial fixed piece 41. The front end of the chute 415. Since the diameter of the steel ball 426 is larger than the thickness of the shift control cam 42, the steel ball 426 will slightly lower the first and second axial fixing pieces 41, 43 from both side surfaces of the shift control cam 42. Due to the elastic force provided by the return springs located outside the first and second axial fixing pieces 41, 43, the steel balls 426 and the sliding grooves 415, 435 of the first and second axial fixing pieces 41, 43 are alternately pushed. effect. The process of pushing the breakthrough can assist the pivot pawls 44, 45, 46 to perform a quick opening and closing action, so that the steel ball 426 cannot be stably maintained in the position shown in FIG. 11B and has the first automatic sliding into the vicinity. The tendency of the front end of the chute 415 of the axial fixing piece 41 avoids the connection point between the opening and closing of any of the internal shaft pawls 44, 45, 46, thereby eliminating the blurring interval of the switching shifting process. At this time, as shown in FIG. 10D, the position of the switching tooth 442 of the first spindle pawl 44 remains in the concave portion of the shift control cam 42. The first pivot pawl 44 is still in the jacked position in 422; and at the same time point, the other two pivot pawls 45, 46 are still in the retracted (slip) position.

As shown in Fig. 10E and Fig. 11C, if the stepping is continued again, the drive shaft 10 together with the first and second axial fixed pieces 41, 43 will continue to rotate clockwise again, but the shift control The cam 42 is still unable to rotate because the abutment projection 421 is subjected to the abutment of the shift control pawl 47. At this time, as shown in FIG. 11C, the steel ball 426 will slide into the front end of the sliding groove 415 of the adjacent first axial fixing piece 41, and the first and second axial fixing pieces 41, 43 will be reset. The reed provides the spring force to return to its original position adjacent to both side surfaces of the shift control cam 42. At this time, as shown in FIG. 10E, the position of the switching tooth 442 of the first spindle pawl 44 is about to leave the concave portion 422 of the shift control cam 42 and assumes a half-up state and is about to become a contraction (slip). Position; at the same time point, the switching teeth 462 of the third spindle pawl 46 are relatively slid into the other recess 422 of the shift control cam 42 to be in the jacked state. As a result, the second pivot pawl 45 is still in the retracted (slip) position.

As shown in FIG. 10F, at this time, the first axis can be made by continuously tilting the drive shaft 10 together with the first and second axial fixed pieces 41, 43 by a little clockwise rotation. The pawl 44 is completely in the retracted (slip-off) position, thus completing the operation of a reverse step. Since the shifting operations of other gears are similar to the foregoing, they will not be described again.

As shown in FIG. 1 to FIG. 5, the transmission base 50 is coupled between a power output end and the plurality of transmission gears 31, 32, 33, and is driven by the first transmission gear 31 of the plurality of transmission gears. Drive shaft The rotary power output when the heart 10 is rotating forward is output to the power output end. In the present embodiment, the power output end is the tooth piece (or the toothed disk) 92. As described above, the transmission gear 31 (or 32, or 33) driven by the transmission shaft 10 is matched with one of the plurality of transmission gears (or 35, or 36) of the plurality of transmission gears that are engaged therewith. The rotation speed of the transmission base 50 can be determined. Therefore, when the transmission gears 31, 32, 33 that are rotated by the transmission shaft 10 during forward rotation are changed, the rotation speed of the transmission base 50 also changes. In turn, the purpose of multi-step shifting is achieved.

The first fixing base 61 and the second fixing base 62 are respectively located at two ends of the transmission shaft 10 and are fixed to the frame 91 of the bicycle adjacent to the crank 91. An opening 611, 621 and a shifting shaft seat 612, 622 are respectively disposed on the first and second fixing bases 61, 62, respectively. The shifting shaft 20 is disposed between the shifting axle seats 612 and 622 of the first and second fixing seats 61 and 62, and corresponds to the first and second fixing seats 61 at both ends of the shifting shaft center 20 . The shifting shafts 612 and 622 of the 62 are respectively provided with the needle rollers 63 and 64 to rotate the shifting shaft 20 relative to the first and second fixing seats 61 and 62. The ball ring 65 is received in the opening 611 of the first fixing base 61. The drive base 50 is sleeved in the ball ring 65 to rotate the drive base 50 relative to the first mount 61, and one end of the drive base 50 protrudes from the first mount 61 away from the second Outside the side of the mount 62. The blade holder 66 is disposed on a side of the first fixing base 61 away from the second fixing base 62 and coupled to the driving base 50 and can be driven to rotate. The tooth piece 92 is fixed to the tooth piece fixing seat 66.

The support frame 67 is coupled between the first and second fixing seats 61, 62 for enhancing structural strength. In this embodiment, the support frame 67 is The annular structure has a receiving space therebetween for accommodating the aforementioned transmission shaft 10, the shifting shaft 20, the shifting gear unit 30, and the shifting cam assembly unit 40. The drive shaft 10 is threaded into the drive base 50 in a relatively rotatable manner. One end of the transmission shaft 10 protrudes out of the opening 611 of the first fixing base 61, and the other end protrudes out of the opening 621 of the second fixing base 62, and both ends of the transmission shaft 10 Each has a head for coupling to the two cranks 91. In addition, the drive shaft 10 corresponds to the opening 621 of the second fixing base 62 and is provided with a bead bowl 681 and a jade 682 to provide a bearing and a pre-pressure function.

The embodiment of the above-described reverse stepped multi-speed shift internal transmission of the present invention mainly uses pawls (especially shaft pawls 44, 45, 46) disposed in the receiving grooves provided on the transmission shaft. As the axis control element, the position of the pawl can be changed (for example, the jacking position or the retracted position) to determine which transmission gear is rotated by the transmission shaft during forward rotation, thereby achieving the function of multi-step shifting. . However, in another embodiment, the reverse stepped multi-speed shift internal transmission of the present invention may also replace at least one of the "keys" provided in the receiving groove provided on the transmission shaft instead of the aforementioned pawl. As the axis control element, the position of the at least one "key" (that is, the axis control element) in the axial direction can also be switched to determine which drive gear will be driven by the drive shaft during forward rotation. Rotating, in turn, can also achieve the function of multi-speed shifting. In the embodiment where at least one "key" is used as the axis control element, the shift cam unit of the present invention may include: at least one axial fixed piece and a shift control cam; the shift control The cam system is sleeved on the drive shaft in a relatively rotatable manner and is coupled to the at least one "key" (ie, the shaft control element), and the shift control The cam shape on the cam is designed to control the switching of the "key" position on the drive shaft for "axial displacement". As for the other components in the present embodiment, such as the shifting shaft center, the shifting gear unit, the transmission base, and the like, the same or similar techniques as those of the foregoing embodiment can be used, and thus detailed description thereof will be omitted.

The above-mentioned embodiments are not intended to limit the scope of application of the present invention, and the scope of the present invention should be based on the technical spirit defined by the content of the patent application scope of the present invention and the scope thereof. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the present invention, and should be considered as a further embodiment of the present invention.

1‧‧‧Inverted multi-stage shifting internal transmission of the present invention

10‧‧‧ drive shaft

101, 102, 103‧‧‧ pawl housing

20‧‧‧Speed shaft

30‧‧‧Transmission gear unit

31‧‧‧First transmission gear

311, 321, 331‧‧ Inner Rings

312, 322, 332‧‧‧ against the recess

313‧‧‧ card block

32‧‧‧Second transmission gear

33‧‧‧ Third transmission gear

34‧‧‧First shifting gear

35‧‧‧Second gear

36‧‧‧ Third gear

40‧‧‧Shift cam unit

41‧‧‧First shaft fixing piece

411, 431‧‧ ‧ cam block

42‧‧‧shift control cam

415, 435‧‧ ‧ chute

421‧‧‧Top bumps

422‧‧‧ Inside recess

425‧‧‧ round hole

426‧‧‧ steel balls

43‧‧‧Second axial fixation

44‧‧‧First Axis Pawl

45‧‧‧Second axis pawl

46‧‧‧ Third Axis Pawl

441, 451, 461‧‧‧ brake teeth

442, 452, 462‧‧‧ switch teeth

47‧‧‧shift control pawl

50‧‧‧ drive base

501‧‧‧ card slot

61‧‧‧First mount

611, 621‧‧ ‧ openings

612, 622‧‧ ‧ shifting shaft seat

62‧‧‧Second mount

63, 64‧‧‧Rolling Pin Palin

65‧‧‧ ball ring

66‧‧‧ tooth holder

67‧‧‧Support frame

681‧‧‧Bead Bowl

682‧‧‧Jade

91‧‧‧ crank

92‧‧‧ teeth

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective exploded view of a preferred embodiment of the reverse stepped multi-speed shifting internal transmission of the present invention in a first perspective.

2 is a perspective exploded view of the preferred embodiment of the inverted stepped multi-speed shifting transmission of the present invention in a second viewing angle.

Figure 3 is a right side elevational view of the preferred embodiment of the reverse stepped multi-speed shifting internal transmission of the present invention in a combined state.

Figure 4 is a cross-sectional view of the A-A (including the crank and the teeth) shown in Figure 3.

Fig. 5 is a perspective view of the reverse shifting multi-stage shifting internal transmission in the combined state of the present invention (excluding the bead bowl, the jade and the second fixing seat).

6A, 6B and 6C are side views of the first, second and third transmission gears of the reverse multi-speed shifting internal transmission of the present invention, respectively.

Figure 7A, 7B and 7C are respectively the reverse stepping of the multi-step shift of the present invention. Side view of the first axial fixed piece, the shift control cam and the second axial fixed piece of the speed governor.

8A, 8B and 8C are respectively perspective views of the first, second and third axial pawls of the reverse stepped multi-speed shifting internal transmission of the present invention.

Figure 9 is a combined view of the first axial fixed piece, the shift control cam and the second axial fixed piece shown in Figures 7A, 7B and 7C on the drive shaft.

10A to 10F are schematic diagrams showing the operation stages of the first axial fixed piece, the shift control cam and the second axial fixed piece together with the shift control pawl in the shifting operation, as shown in FIG. .

Figures 11A, 11B, and 11C are relative positions of the steel ball and the chute, respectively, in the operational stages as shown in Figures 10C, 10D, and 10E.

1‧‧‧Inverted multi-stage shifting internal transmission of the present invention

10‧‧‧ drive shaft

101, 103‧‧‧ pawl housing

20‧‧‧Speed shaft

30‧‧‧Transmission gear unit

31‧‧‧First transmission gear

32‧‧‧Second transmission gear

33‧‧‧ Third transmission gear

34‧‧‧First shifting gear

35‧‧‧Second gear

36‧‧‧ Third gear

40‧‧‧Shift cam unit

41‧‧‧First shaft fixing piece

42‧‧‧shift control cam

43‧‧‧Second axial fixation

44‧‧‧First Axis Pawl

45‧‧‧Second axis pawl

46‧‧‧ Third Axis Pawl

47‧‧‧shift control pawl

50‧‧‧ drive base

501‧‧‧ card slot

61‧‧‧First mount

611, 621‧‧ ‧ openings

612‧‧‧Transmission shaft seat

62‧‧‧Second mount

63, 64‧‧‧Rolling Pin Palin

65‧‧‧ ball ring

66‧‧‧ tooth holder

67‧‧‧Support frame

681‧‧‧Bead Bowl

682‧‧‧Jade

Claims (7)

An inverted stepped multi-speed shift internal transmission includes: a drive shaft coupled to a power input end and capable of being driven by the power input end for forward and reverse movement, and is disposed on the drive shaft At least one receiving seat extending along an axial center; a shifting shaft center disposed parallel to the driving shaft center and separated by a predetermined distance; a shifting gear set unit including a plurality of transmission gears and a plurality of shifting gears; the plurality of transmissions The gear train is sleeved on the drive shaft, and the plurality of shift gears are sleeved on the shift shaft and are correspondingly engaged with the plurality of transmission gears; a shift cam assembly unit includes at least one cam and at least one The at least one cam and the at least one axial control component are sleeved on the transmission shaft, and the at least one axial control component is synchronously rotated with the transmission shaft; the at least one axial control The component is received in the at least one receiving seat and is switchable by the control of the rotation of the at least one cam; the at least one cam can be driven by the reverse movement of the one of the driving shafts Switching the position of an axis control element to determine which of the plurality of transmission gears is rotated by the drive shaft during forward rotation; and a transmission base coupled to a power output end and the plurality Between the transmission gears, the rotation gears of the plurality of transmission gears can be rotated to output the rotary power during forward rotation to the power output end; wherein the transmission gears rotated by the transmission shaft during the forward rotation are matched with the transmission gears One of the plurality of shifting gears corresponding to the meshing gear can be Determining the rotational speed of the drive base, so that when the drive gear driven by the drive shaft changes, the rotational speed of the drive base also changes; wherein the shift cam unit further includes a shift Controlling the pawl and the at least one axial fixing piece, and the at least one cam system includes a shift control cam; the shift control cam is sleeved on the transmission shaft in a relatively rotatable manner and linked to the at least one The axis control component is configured to control the position switching of the at least one axis control component; wherein the at least one axial fixing piece comprises a first axial fixing piece and a second axial fixing piece; the first And the second shaft fixing piece is fixed on the transmission shaft and rotates in conjunction therewith; the shift control cam is sleeved on the transmission shaft in a relatively slidable manner and is sandwiched between the first and second Between the axial fixing pieces; one of the outer ring portions of the shift control cam is provided with a plurality of abutting lugs, and one of the inner ring portions of the shift control cam is provided with a plurality of inner recesses; wherein the shift control The number of pawls is only Single one, and one of the outer ring portions of the shift control cam is provided with a plurality of abutting lugs, but the outer ring portion of each of the axial fixing pieces is not provided with any cam block structure, so The shift control pawl does not completely resist the outer ring portion of both the first axial fixed piece and the second axial fixed piece when the drive shaft is positive or negative; At least one arc-shaped chute is respectively disposed on the axial fixing piece, and at the position corresponding to each arc-shaped chute on the shift control cam, at least one round hole is respectively provided, and each One of the circular holes is respectively provided with a steel ball; wherein the position of the shift control pawl corresponds to the outer ring portion of the shift control cam, and the shift control pawl can be reversed when the drive shaft is inverted Resisting against a certain abutting protrusion of the shift control cam to assume an abutting state, and sliding the respective abutting protrusions of the shift control cam when the transmission shaft is rotating forward a state of being disengaged; wherein when the shift control cam is not pressed against the top bump by the shift control pawl, the shift control cam will be coupled to the first shaft and the second shaft The frictional force on the contact surface of both the core pieces is rotated together. The multi-step shifting internal transmission according to claim 1, wherein the at least one axial control element is at least one axial pawl; and, on the transmission shaft, is disposed along an axis Extending at least one pawl receiving seat; and the at least one axial pawl is respectively received in the at least one pawl receiving seat and can be individually switched within one by the control of the rotation of the shift control cam Between the retracted position and a jacked position; the shift control pawl is adjacent to one side of the shift control cam, and is responsive to the reverse movement of the drive shaft to abut the shift control cam, Performing a rotary motion relative to the drive shaft to control a position switching operation of the at least one pivot pawl; wherein the at least one pivot pawl respectively has a brake tooth, and each of the pivot pawls is braked The positions of the teeth correspond to one of the plurality of transmission gears respectively; when a certain axis pawl is located at the jacking position, the braking teeth of the jacking pawl of the jacking shaft will withstand Its corresponding transmission gear will be driven by the shaft Rotating during forward rotation, as for other positions in the retracted position The transmission gear corresponding to the shaft pawl will not be directly driven by the drive shaft during forward rotation. The multi-step shifting internal transmission according to claim 2, wherein: the plurality of transmission gears include a first transmission gear and a second transmission gear; the first transmission gear is coupled to and coupled to the transmission base The base of the transmission is directly driven by the first transmission gear; and the inner ring portion of each of the transmission gears is respectively provided with a plurality of abutting recesses that can be unidirectionally detached, and each of the transmission gears The plurality of abutting recesses may be driven by the braking teeth being at the jacking position when the corresponding braking teeth are at the jacking position and being rotated by the braking teeth; the plurality of shifting gears includes a first shifting gear and a second a shifting gear corresponding to the first and second transmission gears respectively; the at least one axial pawl includes a first axial pawl and a second axial pawl; each of the axial pawls respectively having the brake a tooth and a switching tooth, and the braking teeth of each of the shaft pawls and the switching teeth are synchronously switched between the retracted position and the jacking position; the position of the braking teeth of the first shaft pawl corresponds to The first transmission gear The inner ring portion, the position of the braking teeth of the second shaft pawl corresponds to the inner ring portion of the second transmission gear; further, the position of the switching teeth of each of the shaft pawls corresponds to the shift control At the inner ring portion of the cam, when the position of a certain concave portion of the shift control cam corresponds to the position of the switching tooth of a certain axis pawl, the switching tooth of the corresponding shaft pawl will be pushed in Corresponding to the inner concave portion, the brake teeth of the corresponding axial pawl are also synchronously jacked up to switch to the jacking position; To the ground, when the position of the switching tooth of a certain axis pawl does not correspond to the position of any of the inner recesses, the pivot pawl is in the retracted position. The multi-step shift internal transmission according to claim 2, wherein: the plurality of transmission gears include a first transmission gear, a second transmission gear, and a third transmission gear; the first transmission gear train Combining and interlocking with the transmission base, the transmission base is directly driven to rotate by the first transmission gear; and, in each of the transmission gears, each of the ring portions is respectively provided with a plurality of one-way slippage a recess, the plurality of transmission gears abutting the recesses may be driven by the braking teeth when the corresponding braking teeth are located at the jacking position and when the driving shaft is rotating forward; the plurality of shifting gears includes a first a shifting gear, a second shifting gear, and a third shifting gear respectively meshing with the first, second, and third transmission gears; the at least one axial pawl includes a first axial pawl, and a a second axial pawl and a third axial pawl; each of the axial pawls respectively includes the brake tooth and a switching tooth, and the braking teeth of each of the axial pawls and the switching teeth are synchronously switched to Retracted position and the top position The position of the brake teeth of the first spindle pawl corresponds to the inner ring portion of the first transmission gear, and the position of the brake teeth of the second spindle pawl corresponds to the second transmission gear An inner ring portion, and a position of a brake tooth of the third shaft pawl corresponds to an inner ring portion of the third transmission gear; further, a position of a switching tooth of each of the shaft pawls corresponds to the shift Controlling the inner ring of the cam, when the shift control cam When the position of an inner concave portion corresponds to the position of the switching tooth of a certain axial pawl, the switching tooth of the corresponding axial pawl can be inserted into the corresponding inner concave portion, thereby making the corresponding shaft The brake teeth of the heart pawl are also synchronously jacked up and switched to the jacking position; in contrast, when the position of the switching teeth of a certain axis pawl does not correspond to the position of any of the recesses, the shaft pawl Is in the retracted position. The multi-step shift internal transmission according to claim 2, wherein: the plurality of transmission gears include a first transmission gear, a second transmission gear, and a third transmission gear; the first transmission gear train Combining and interlocking with the transmission base, the transmission base is directly driven to rotate by the first transmission gear; and, in each of the transmission gears, each of the ring portions is respectively provided with a plurality of one-way slippage a recess, the plurality of transmission gears abutting the recesses may be driven by the braking teeth when the corresponding braking teeth are located at the jacking position and when the driving shaft is rotating forward; the plurality of shifting gears includes a first a shifting gear, a second shifting gear, and a third shifting gear respectively meshing with the first, second, and third transmission gears; the at least one axial pawl includes a first axial pawl, and a a second axial pawl and a third axial pawl; each of the axial pawls respectively includes the brake tooth and a switching tooth, and the braking teeth of each of the axial pawls and the switching teeth are synchronously switched to Retracted position and the top position Between the positions of the brake teeth of the first shaft pawl corresponding to the inner ring portion of the first transmission gear, the position of the brake teeth of the second shaft pawl Corresponding to the inner ring portion of the second transmission gear, and the position of the braking teeth of the third shaft pawl corresponds to the inner ring portion of the third transmission gear; further, the switching teeth of the shaft pawls The position is corresponding to the inner ring portion of the shift control cam. When the position of a certain concave portion of the shift control cam corresponds to the position of the switching tooth of a certain axis pawl, the corresponding axis The switching teeth of the heart pawl can be inserted into the corresponding concave portion thereof, so that the braking teeth of the corresponding pivot pawl are also synchronously jacked to switch to the jacking position; relatively, when a certain axis When the position of the switching tooth of the pawl does not correspond to the position of any of the inner recesses, the pivot pawl is in the retracted position. The multi-step shift internal transmission according to claim 5, wherein: the number of teeth of at least two of the first, second and third transmission gears is different; the first and second At least two of the third shifting gears have different numbers of teeth. The reverse stepped multi-segment shifting internal transmission according to claim 5, which is disposed on a bicycle having two cranks and a tooth, wherein the power input end is the two cranks, and the power output end That is, the toothed piece; and the reverse stepped multi-speed shifting internal transmission system further includes: a first fixed seat and a second fixed seat respectively located at two ends of the transmission shaft and fixed to one of the bicycles And a shifting shaft seat respectively disposed on the first and second fixing bases; the shifting shaft is disposed on the shifting shafts of the first and second fixing seats Between the seats, and at each end of the shifting shaft, a needle roller is respectively disposed at the shifting shaft seats corresponding to the first and second fixing seats, so that the shifting shaft can be opposite to the first and second fixing bases. Rotating; a ball ring is received in the opening of the first fixing seat; the driving base is sleeved in the ball ring to rotate the transmission base relative to the first fixing seat, and one end of the transmission base a lens holder extending away from the side of the second fixing seat; a blade fixing seat disposed on the side of the first fixing seat farther away from the second fixing seat and coupled to the transmission base Driving rotation; wherein the tooth piece is fixed on the tooth piece fixing seat; and at least one support frame is coupled between the first and second fixing seats for reinforcing structural strength; wherein the transmission shaft center is The sleeve can be inserted into the transmission base in a relatively rotatable manner; one end of the transmission shaft protrudes out of the opening of the first fixing seat, and the other end protrudes out of the opening of the second fixing seat, And, the two ends of the transmission shaft are respectively coupled to the two cranks; Heart propeller shaft corresponding to the second holder of the opening set and features a bead jade bowl and a charge.