Mid-mounted fixed-axis gear-driven column-type bicycle transmission

Abstract

A mid-mounted fixed-axis gear-driven column-type bicycle transmission, which combines a parallel-axis gear transmission with a planetary gear transmission. On the basis of the parallel-axis gear transmission, a crank main shaft (0101) is taken as the central axis, transition gear shaft assemblies (07) are increased from one to several, and are arranged along the concentric circle around the outer periphery of the crank main shaft (0101) to form a planetary structure, and a control camshaft assembly (16) is provided on the peripheral axis parallel to the crank main shaft (0101). The crank main shaft (0101) is also an assembly, the left end of the crank main shaft (0101) serving as an input side, and the right end thereof serving as an output side. An output sleeve assembly (14) is concentrically sleeved on the outer periphery of a section of the output side of the crank main shaft (0101). The configuration enables the transmission to have a relatively simple structure, light weight, small size, high efficiency, and a safe and reliable shift control system and low production cost.

Description

Bicycle middle fixed shaft gear transmission column type derailleur TECHNICAL FIELD

[0001] The technology of the present application belongs to the field of bicycle middle shaft derailleur, and is further subdivided into the field of internal derailleur of bicycle derailleur. BACKGROUND

[0002] At present, there are relatively few mature products in the bicycle middle shaft derailleur technology on the market. There are bicycle middle parallel shaft gear derailleur in foreign countries, and domestic enterprises are also developing. In technical documents, relevant patents of bicycle middle shaft derailleur pay attention to parallel shaft gear derailleur and planetary gear derailleur, but in the position of bicycle middle shaft, the structure of parallel shaft gear derailleur and planetary gear derailleur each has advantages and disadvantages.

[0003] The ideal derailleur required in the position of bicycle middle shaft should be column type, relatively simple structure, light weight, small volume, high efficiency, safe and reliable gear control system, and low production cost. SUMMARY

[0004] The present application: bicycle middle fixed shaft gear transmission column type derailleur, optimizes the combination of the structural advantages of parallel shaft gear derailleur and planetary gear derailleur.

[0005] The specific technical scheme is: on the basis of parallel shaft gear derailleur, taking the crankshaft as the center shaft, increasing the number of transition gear shaft assembly from one to several, and arranging them along the concentric circle of the outer periphery of the crankshaft, forming a planetary structure, and setting a control camshaft assembly on the outer peripheral axis parallel to the crankshaft, the crankshaft is also an assembly, the left end of the crankshaft is the power input side, and the right end is the power output side, and an output sleeve assembly is concentrically sleeved on the outer periphery of a section of the power output side of the crankshaft.

[0006] The bicycle middle fixed shaft gear transmission column type derailleur, the outer shape of the shell is column type, the inner periphery is hollow structure and sets a group of boss and hole connected with countersunk head pin bolt, the left side of the shell is provided with left end cover, the right side of the shell is provided with right end cover, the left end cover and the right end cover are connected with the column type shell through a group of countersunk head pin bolts to form an integral structure, the column type shell is fixedly connected to the position of the bicycle middle shaft five-way pipe, the left end cover and the right end cover are provided with bearing seats corresponding to the axis positions of the crankshaft assembly, the output sleeve assembly, the transition gear shaft assembly and the control camshaft assembly, and the left end cover and the right end cover are connected with the crankshaft assembly, the output sleeve assembly, the transition gear shaft assembly and the control camshaft assembly through a plurality of bearings.

[0007] The bicycle middle fixed shaft gear transmission column type derailleur, the control camshaft, the wire pulling wheel, the connecting plate and the buffer torsion spring are led out at the coaxial position of the left end cover and the control camshaft assembly.

[0008] The bicycle middle fixed shaft gear transmission column type derailleur, the control camshaft, the wire pulling wheel, the connecting plate and the buffer torsion spring are led out at the coaxial position of the left end cover and the control camshaft assembly.

[0009] The bicycle middle fixed shaft gear transmission column type derailleur, the control camshaft, the wire pulling wheel, the connecting plate and the buffer torsion spring are led out at the coaxial position of the left end cover and the control camshaft assembly.

[0010] The bicycle middle fixed shaft gear transmission column type derailleur, the control camshaft, the wire pulling wheel, the connecting plate and the buffer torsion spring are led out at the coaxial position of the left end cover and the control camshaft assembly.

[0011] The bicycle middle fixed shaft gear transmission column type derailleur, the control camshaft, the wire pulling wheel, the connecting plate and the buffer torsion spring are led out at the coaxial position of the left end cover and the control camshaft assembly.

[0012] The bicycle middle fixed shaft gear transmission column type derailleur, the control camshaft, the wire pulling wheel, the connecting plate and the buffer torsion spring are led out at the coaxial position of the left end cover and the control camshaft assembly.

[0013] The bicycle middle fixed shaft gear transmission column type derailleur, the control camshaft, the wire pulling wheel, the connecting plate and the buffer torsion spring are led out at the coaxial position of the left end cover and the control camshaft assembly.

[0014] Further, the crank spindle assembly of the bicycle middle fixed axle gear drive column type derailleur, the left end is the power input side, a set of input stage center gears and a set of input stage shift fork clutches are sleeved on the outer periphery of the left section of the crank spindle, the input stage center gears are all driving gears, the input stage center gear with the smallest input speed ratio in the set of input stage center gears is connected with the crank spindle through the input stage one-way overrunning clutch, the rest of the input stage center gears are empty sleeved on the crank spindle and are selectively connected with the crank spindle through the input stage shift fork clutch, the input stage shift fork clutch is connected with the crank spindle in a rotation resisting manner through the spline and can slide axially relative to the crank spindle, the right end of the crank spindle is the power output side after the speed change, an output sleeve assembly is sleeved on the outer periphery of the right section of the crank spindle through the crank spindle bearing support.

[0015] Further, the output sleeve assembly of the bicycle middle fixed axle gear drive column type derailleur, a set of output stage center gears and a set of output stage shift fork clutches are sleeved on the outer periphery of the left section, the output stage center gears are all driven gears, the output stage center gear with the smallest output speed ratio is connected with the output sleeve through the output stage one-way overrunning clutch, the rest of the output stage center gears are empty sleeved on the output sleeve and are selectively connected with the output sleeve through the output stage shift fork clutch, the output stage shift fork clutch is connected with the output sleeve in a rotation resisting manner through the spline and can slide axially relative to the output sleeve.

[0016] Further, the transition gear shaft assembly of the bicycle middle fixed axle gear drive column type derailleur, the left end is the power input side, a set of input stage transition gears are arranged on the left section and are engaged with a set of input stage center gears on the crank spindle assembly, the input stage transition gears are all rotation resisting connected with the transition gear shaft, a set of output stage transition gears are arranged on the right section of the transition gear shaft, the set of output stage transition gears are engaged with a set of output stage center gears on the output sleeve assembly, the output stage transition gears are all rotation resisting connected with the transition gear shaft, the transition gear shaft assembly rotates synchronously as a whole during the work.

[0017] Further, the control camshaft assembly of the bicycle middle fixed shaft gear transmission column type derailleur is sequentially sleeved with a reset torsion spring, an input stage cam groove sleeve, an output stage cam groove sleeve on the control camshaft inside the derailleur housing from the left side, the input stage cam groove sleeve is sleeved with an input stage clutch yoke outside the periphery, the output stage cam groove sleeve is sleeved with an output stage clutch yoke outside the periphery, the left end of the reset torsion spring is rotationally connected with the left end cover, the right end of the reset torsion spring is rotationally connected with the input stage cam groove sleeve, the input stage cam groove sleeve and the output stage cam groove sleeve are fixedly connected with the control camshaft, the outer periphery of the input stage cam groove sleeve and the output stage cam groove sleeve is provided with corresponding axial cam grooves, the input stage cam groove sleeve is connected with the input stage clutch yoke through a clutch yoke pin shaft, the clutch yoke pin shaft is fixed to the input stage clutch yoke and is inserted into the cam groove of the input stage cam groove sleeve, the connection mode of the output stage cam groove sleeve and the output stage clutch yoke is the same as that of the input stage, the rotation of the control camshaft can drive the input stage clutch yoke and the output stage clutch yoke to axially slide relative to the control camshaft through the respective axial cam grooves of the input stage cam groove sleeve and the output stage cam groove sleeve to realize the gear shifting function, the left side of the control camshaft is rotationally connected with a connecting plate at the shaft segment extending out of the left end cover, is sleeved with a pull ring and a buffer torsion spring.

[0018] Further, the power transmission route of the bicycle middle fixed shaft gear transmission column type derailleur is a crankshaft, an input stage center gear, an input stage transition gear, a transition gear shaft, an output stage transition gear, an output stage center gear and an output sleeve in sequence, and a multi-gear derailleur is formed through the selective connection of the input stage clutch yoke and the output stage clutch yoke.

[0019] Further, the power for the upshift control of the bicycle middle fixed shaft gear transmission column type derailleur is provided by the clockwise rotation of the pull ring, the power transmission route is a pull ring, a buffer torsion spring, a connecting plate, a control camshaft, an input stage cam groove sleeve and an output stage cam groove sleeve, a clutch yoke pin shaft, an input stage clutch yoke and an output stage clutch yoke, an input stage clutch yoke and an output stage clutch yoke, and the torque energy of the reset torsion spring is stored through the rotation of the control camshaft, the torque energy is released by the reset torsion spring during downshift, so that the control camshaft rotates counterclockwise to realize downshift. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is an external axial side view of the bicycle middle fixed shaft gear transmission column type derailleur.

[0021] Fig. 2 is a general sectional view of the bicycle middle fixed shaft gear transmission column type derailleur.

[0022] Fig. 3 is an internal front view of the bicycle middle fixed shaft gear transmission column type derailleur.

[0023] Figure 4 is a front view of a crank spindle assembly of a bicycle mid-mounted fixed axle gear drive column derailleur.

[0024] Figure 5 is a front view of an output sleeve assembly of a bicycle mid-mounted fixed axle gear drive column derailleur.

[0025] Figure 6 is a front view of a transition gear shaft assembly of a bicycle mid-mounted fixed axle gear drive column derailleur.

[0026] Figure 7 is a shaft side view of a control cam shaft assembly of a bicycle mid-mounted fixed axle gear drive column derailleur.

[0027] Figure 8 is a partial shaft side view of a control cam shaft assembly of a bicycle mid-mounted fixed axle gear drive column derailleur.

[0028] Zero, component serial number and name in the drawing 2: 01 crank spindle assembly, 02 crank spindle left bearing, 03 input stage one-way overrunning clutch, 04 transition gear shaft left bearing, 05 left end cover, 06 column housing, 07 transition gear shaft assembly, 08 right end cover, 09 transition gear shaft right bearing, 10 output stage one-way overrunning clutch, 11 output sleeve outer bearing, 12 crank spindle right bearing, 13 crank spindle right bearing locking cover, 14 output sleeve assembly, 15 control cam shaft right bearing, 16 control cam shaft assembly, 17 control cam shaft right bearing, 18 connecting plate, 19 buffer torsion spring, 20 pull wire ring.

[0029] Zero, component serial number and name in the drawing 3, drawing 4: 21 countersunk head pin bolt, 0101 crank spindle, 0102 input stage first central gear, 0103 input stage second central gear, 0104 input stage third central gear, 0105 input stage shift fork clutch, 14 output sleeve assembly.

[0030] Zero, component serial number and name in the drawing 5: 1401 output stage first central gear, 1402 output stage second central gear, 1403 output stage third central gear, 1405 output stage shift fork clutch, 1206 output sleeve.

[0031] Zero, component serial number and name in the drawing 6: 0701 transition gear shaft, 0702 input stage first transition gear, 0703 input stage second transition gear, 0704 input stage third transition gear, 0705 output stage first transition gear, 0706 output stage second transition gear, 0707 output stage third transition gear.

[0032] Zero, component serial number and name in the drawing 7, drawing 8: 1601 control cam shaft, 1602 reset torsion spring, 1603 input stage cam groove sleeve, 1604 input stage clutch shift fork, 1605 output stage cam groove sleeve, 1606 output stage clutch shift fork, 1607 shift fork pin shaft. DETAILED DESCRIPTION

[0033] The application will be further described below in conjunction with the drawings.

[0034] The specific embodiments are only an explanation of the application, which is not a limitation of the application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the application.

[0035] Embodiment:

[0036] A bicycle middle fixed shaft gear transmission column type derailleur, its transmission system and control system include crankshaft assembly body 01, transition gear shaft assembly body 07, output sleeve assembly body 14, control camshaft assembly body 16.

[0037] The bicycle middle fixed shaft gear transmission column type derailleur sets three input transmissions, three output transmissions, an input stage one-way overrunning clutch, an output stage one-way overrunning clutch, which together constitute a 9-gear derailleur. The input stage transmission is acceleration transmission, and the output stage transmission is deceleration transmission.

[0038] Referring to the crankshaft assembly 01 described in FIG. 2, FIG. 4 includes 0101 crankshaft, 0102 input stage first sun gear, 0103 input stage second sun gear, 0104 input stage third sun gear, 14 output sleeve assembly; wherein the 0101 crankshaft is supported and connected to the left end cover and the output sleeve through its left bearing and right bearing, the crankshaft is sequentially sleeved with the input stage one-way overrunning clutch 03, the input stage first sun gear 0102, the input stage second sun gear 0103, the input stage fork clutch 0105, the input stage third sun gear 0104, and the output sleeve assembly 14 from the left side, the input stage first sun gear 0102 is sleeved on the outer periphery of the input stage one-way overrunning clutch and connected to the crankshaft through the input stage one-way overrunning clutch, the input stage second sun gear 0103 is sleeved on the crankshaft and selectively connected to the crankshaft through the input stage fork clutch, the input stage third sun gear 0104 is sleeved on the crankshaft and selectively connected to the crankshaft through the input stage fork clutch, the input stage fork clutch 0105 is synchronously rotated with the crankshaft through the spline connection and can slide axially relative to the crankshaft; the input stage first sun gear 0102 bears the power input of gear 1, gear 4, and gear 7, the input stage second sun gear 0103 bears the power input of gear 2, gear 5, and gear 8, and the input stage third sun gear 0104 bears the power input of gear 3, gear 6, and gear 9; when the transmission works in gear 1, gear 4, and gear 7, the power of the crankshaft is transmitted to the input stage first sun gear 0102 through the input stage one-way overrunning clutch and engaged with the corresponding input stage transition gear, the input stage fork clutch is in the neutral position, and the remaining input stage sun gears are in an idle state; when the transmission works in gear 2, gear 5, and gear 8, the input stage fork clutch slides to the left and combines with the input stage second sun gear 0103, the power of the crankshaft is transmitted to the input stage second sun gear 0103 through the input stage fork clutch and engaged with the corresponding input stage transition gear, the input stage first sun gear 0102 is in the overrunning state, and the input stage third sun gear 0104 is in the idle state; when the transmission works in gear 3, gear 6, and gear 9, the input stage fork clutch slides to the right and combines with the input stage third sun gear 0104, the power of the crankshaft is transmitted to the input stage third sun gear 0104 through the input stage fork clutch and engaged with the corresponding input stage transition gear, the input stage first sun gear 0102 is in the overrunning state, and the input stage second sun gear 0103 is in the idle state.

[0039] The output sleeve assembly described with reference to FIG. 2 and FIG. 5 comprises an output stage first sun gear 1401, an output stage fork clutch 1404, an output stage second sun gear 1402, an output stage third sun gear 1403, and an output sleeve 1405; the output sleeve assembly is supported by an output sleeve outer bearing on the right end cover and by a crankshaft right bearing on the crankshaft, and the right end of the output sleeve extends out of the right end cover and outputs power; the output stage sun gears on the output sleeve are all driven gears that receive power from the output stage transition gears on the transition gear shaft, and the output stage transmission is configured as a speed reduction transmission; the output stage first sun gear 1401 is loosely fitted on the outer periphery of the left side of the output sleeve and is selectively connected to the output sleeve by the output stage fork clutch, the output stage fork clutch is connected to the output sleeve by splines and can slide axially relative to the output sleeve, the output stage second sun gear 1402 is loosely fitted on the outer periphery of the output sleeve and is selectively connected to the output sleeve by the output stage fork clutch, and the output stage third sun gear 1403 is installed on the outer periphery of the output sleeve by an output stage one-way overrunning clutch; the output stage third sun gear 1403 outputs power for 1st gear, 2nd gear, and 3rd gear, the output stage second sun gear 1402 outputs power for 4th gear, 5th gear, and 6th gear, and the output stage first sun gear 1401 outputs power for 7th gear, 8th gear, and 9th gear; when the transmission is working in 1st gear, 2nd gear, or 3rd gear, the output stage third sun gear 1403 receives power from the corresponding meshing output stage transition gear and transmits the power to the output sleeve through the output stage one-way overrunning clutch, the output stage fork clutch is in the neutral position, and the remaining output stage sun gears are in an idling state; when the transmission is working in 4th gear, 5th gear, or 6th gear, the output stage fork clutch slides to the right and engages with the output stage second sun gear 1402, the output stage second sun gear 1402 receives power from the corresponding meshing output stage transition gear and transmits the power to the output sleeve through the output stage fork clutch, the output stage third sun gear 1403 is in an overrunning state, and the output stage first sun gear 1401 is in an idling state; when the transmission is working in 7th gear, 8th gear, or 9th gear, the output stage fork clutch slides to the left and engages with the output stage first sun gear 1401, the output stage first sun gear 1401 receives power from the corresponding meshing output stage transition gear and transmits the power to the output sleeve through the output stage fork clutch, the output stage second sun gear 1402 is in an idling state, and the output stage third sun gear 1403 is in an overrunning state.

[0040] The transition gear shaft assembly described with reference to FIG. 2, FIG. 6 comprises a transition gear shaft 0701, an input stage first transition gear 0702, an input stage second transition gear 0703, an input stage third transition gear 0704, an output stage first transition gear 0705, an output stage second transition gear 0706, an output stage third transition gear 0707; all the input stage transition gears and output stage transition gears are fixedly connected with the transition gear shaft, and the transition gear assembly rotates synchronously as a whole during operation, the transition gear shaft is supported by the left bearing and the right bearing on the left end cover and the right end cover; the input stage transition gears are arranged in three levels, and the output stage transition gears are arranged in three levels.

[0041] The control cam shaft assembly described with reference to FIG. 2, FIG. 7, FIG. 8 comprises a control cam shaft 1601, a reset torsion spring 1602, an input stage cam sleeve 1603, an input stage clutch yoke 1604, an output stage cam sleeve 1605, an output stage cam sleeve 1606, a pin shaft 1607, a connecting plate 19, a buffer torsion spring 18, and a pull ring 20; the control cam shaft is supported by the left bearing and the right bearing on the left end cover and the right end cover, and the control cam shaft assembly is sequentially sleeved with the reset torsion spring, the input stage cam sleeve, and the output stage cam sleeve on the control cam shaft inside the transmission housing from the left side, the input stage clutch yoke is sleeved on the outer periphery of the input stage cam sleeve, and the output stage clutch yoke is sleeved on the outer periphery of the output stage cam sleeve; the left end of the reset torsion spring is rotationally connected with the left end cover, and the right end thereof is rotationally connected with the input stage cam sleeve; the input stage cam sleeve and the output stage cam sleeve are fixedly connected with the control cam shaft; the outer periphery of the input stage cam sleeve and the output stage cam sleeve is provided with corresponding axial cam grooves; the input stage cam sleeve is connected with the input stage clutch yoke through the yoke pin shaft, the yoke pin shaft is fixed to the input stage clutch yoke and inserted into the cam groove of the input stage cam sleeve; the output stage cam sleeve is connected with the output stage clutch yoke in the same manner as the input stage; the rotation of the control cam shaft can drive the input stage yoke clutch yoke and the output stage yoke clutch yoke to axially slide relative to the control cam shaft through the axial cam grooves of the input stage cam sleeve and the output stage cam sleeve to achieve the gear shifting function; the connecting plate is rotationally connected with the shaft segment of the left end of the control cam shaft that protrudes out of the left end cover; the pull ring and the buffer torsion spring are sleeved.

[0042] The embodiment described above is a gear ratio table of a bicycle middle fixed shaft gear transmission column type derailleur:

[0043] The input stage speed ratio is divided into three levels: 1st level: 1:3.692, 2nd level: 1:3.00, and 3rd level: 1:2.471.

[0044] The output stage speed ratio is divided into three levels: 1st level: 1:0.818, 2nd level: 1:0.452, and 3rd level: 1:0.255.

[0045] Overall speed ratio: 1st gear; 1:0.630, 2nd gear; 1:0.765, 3rd gear; 1:0.941, 4th gear; 1:1.117,

[0046] 5th gear; 1:1.356, 6th gear; 1:1.669, 7th gear; 1:2.021, 8th gear; 1:2.454, 9th gear; 1:3.020.

[0047] Invention name entered here TECHNICAL FIELD

[0048] Technical field description paragraph entered here. BACKGROUND

[0049] Background description paragraph entered here. PROBLEMS TO BE SOLVED BY THE INVENTION

[0050] Technical problem description paragraph entered here. TECHNICAL SOLUTION

[0051] Technical solution description paragraph entered here. ADVANTAGEOUS EFFECTS

[0052] Advantageous effect description paragraph entered here. BRIEF DESCRIPTION OF DRAWINGS

[0053] Brief description of drawings paragraph entered here. BEST MODE FOR CARRYING OUT THE INVENTION

[0054] Best mode description paragraph entered here. EMBODIMENTS OF THE INVENTION

[0055] Embodiment description paragraph entered here. INDUSTRIAL APPLICABILITY

[0056] Industrial applicability description paragraph entered here. SEQUENCE LIST FREE CONTENT

[0057] Sequence list free content description paragraph entered here.

Claims

1. The described: bicycle middle fixed shaft gear drive column type derailleur, characterized by: The structural advantages of parallel shaft gear transmission and planetary gear transmission are combined, and a plurality of transition gear shaft assemblies are arranged along the concentric circle of the crankshaft, forming a planetary structure, and a control camshaft assembly is arranged on the axis parallel to the crankshaft, and the crankshaft is also an assembly, the left end of the crankshaft is the power input side, and the right end is the power output side, and the output sleeve assembly is arranged on the outer periphery of the crankshaft. The bicycle middle fixed shaft gear transmission column type speed changer has a column type shell, a hollow structure in the inner periphery, and a group of bosses and holes connected with the countersunk pin bolts, a left end cover arranged on the left side of the shell, a right end cover arranged on the right side of the shell, and a column type shell fixedly connected to the position of the bicycle middle shaft five-way pipe. The bicycle middle fixed shaft gear transmission column type speed changer has a control camshaft, a wire pulling wheel, a connecting plate and a buffer torsion spring. The bicycle middle fixed shaft gear transmission column type speed changer comprises a crankshaft assembly, a transition gear shaft assembly, an output sleeve assembly and a control camshaft assembly. The bicycle middle fixed shaft gear transmission column type speed changer comprises a crankshaft assembly, a transition gear shaft assembly, an output sleeve assembly and a control camshaft assembly. The bicycle middle fixed shaft gear transmission column type speed changer comprises a crankshaft assembly, a transition gear shaft assembly, an output sleeve assembly and a control camshaft assembly. The bicycle middle fixed shaft gear transmission column type speed changer comprises a crankshaft assembly, a transition gear shaft assembly, an output sleeve assembly and a control camshaft assembly. The bicycle middle fixed shaft gear transmission column type speed changer comprises a crankshaft assembly, a transition gear shaft assembly, an output sleeve assembly and a control camshaft assembly. The bicycle middle fixed shaft gear transmission column type speed changer comprises a crankshaft assembly, a transition gear shaft assembly, an output sleeve assembly and a control camshaft assembly. The bicycle middle fixed shaft gear transmission column type speed changer comprises a crankshaft assembly, a transition gear shaft assembly, an output sleeve assembly and a control camshaft assembly. The control camshaft assembly of the bicycle middle fixed axle gear transmission column derailleur includes a control camshaft, a return torsion spring, an input stage cam groove sleeve, an input stage clutch yoke, an output stage cam groove sleeve, an output stage clutch yoke, and a yoke pin shaft.

2. The midshaft fixed axle gear drive column derailleur for bicycles according to claim 1, characterized in that: The left end of the crankshaft assembly is a power input side, and a group of input stage center gears and a group of input stage clutches are sleeved on the outer periphery of the left segment of the crankshaft, the input stage center gears are all driving gears, the input stage center gear with the smallest input speed ratio in the group of input stage center gears is connected to the crankshaft through an input stage one-way overrunning clutch, and the remaining input stage center gears are empty sleeved on the crankshaft and are selectively connected to the crankshaft through input stage yoke clutches, the input stage yoke clutches are connected to the crankshaft in a rotation-resistant manner through splines and can slide axially relative to the crankshaft, the right end of the crankshaft is a power output side after speed change, and an output sleeve assembly is sleeved on the outer periphery of the right segment of the crankshaft through a crankshaft bearing support.

3. The midshaft fixed axle gear drive column derailleur for a bicycle as defined in claim 1 wherein: The left segment of the output sleeve assembly is sleeved with a group of output stage center gears and a group of output stage yoke clutches, the output stage center gears are all driven gears, the output stage center gear with the smallest output speed ratio is connected to the output sleeve through an output stage one-way overrunning clutch, and the remaining output stage center gears are empty sleeved on the output sleeve and are selectively connected to the output sleeve through output stage yoke clutches, the output stage yoke clutches are connected to the output sleeve in a rotation-resistant manner through splines and can slide axially relative to the output sleeve.

4. The midship fixed axle gear cluster derailleur of claim 1 wherein the transition The left end of the gear shaft assembly is a power input side, a group of input stage transition gears are arranged on the left segment of the gear shaft and are engaged with a group of input stage center gears on the crankshaft assembly, the input stage transition gears are rotation-resistantly connected to the transition gear shaft, a group of output stage transition gears are arranged on the right segment of the transition gear shaft, a group of output stage center gears on the output sleeve assembly are engaged with the group of output stage transition gears, the output stage transition gears are rotation-resistantly connected to the transition gear shaft, and the transition gear shaft assembly rotates synchronously as a whole during work.

5. The midshaft fixed axle gear drive column derailleur for a bicycle as defined in claim 1 wherein: The control camshaft assembly is sequentially sleeved with a reset torsion spring, an input stage cam groove sleeve, an output stage cam groove sleeve from left to right on the control camshaft inside the transmission housing. The input stage shift fork clutch fork is sleeved on the outer periphery of the input stage cam groove sleeve, and the output stage shift fork clutch fork is sleeved on the outer periphery of the output stage cam groove sleeve. The left end of the reset torsion spring is rotationally connected with the left end cover, and the right end of the reset torsion spring is rotationally connected with the input stage cam groove sleeve. The input stage cam groove sleeve and the output stage cam groove sleeve are fixedly connected with the control camshaft. The outer periphery of the input stage cam groove sleeve and the output stage cam groove sleeve is provided with corresponding axial cam grooves. The input stage cam groove sleeve is connected with the input stage shift fork clutch fork through a shift fork pin shaft. The shift fork pin shaft is fixed to the shift fork of the input stage shift fork clutch and is inserted into the cam groove of the input stage cam groove sleeve. The output stage cam groove sleeve is connected with the output stage shift fork clutch fork in the same way as the input stage. The rotation of the control camshaft can drive the input stage shift fork clutch fork and the output stage shift fork clutch fork to axially slide relative to the control camshaft through the respective axial cam grooves of the input stage cam groove sleeve and the output stage cam groove sleeve to realize gear shifting function. The left end of the control camshaft, which extends out of the shaft section of the left end cover, is rotationally connected with a connecting plate, and a pull ring and a buffer torsion spring are sleeved.

6. The midshaft fixed axle gear drive column derailleur of claim 1 wherein: The power transmission route is a crankshaft, an input stage center gear, an input stage transition gear, a transition gear shaft, an output stage transition gear, an output stage center gear, and an output sleeve in sequence, and a multi-gear transmission is formed by the selective connection of the input stage shift fork clutch and the output stage shift fork clutch.

7. The midshaft fixed axle gear drive column derailleur of claim 1 wherein: The power for upshift control is provided by the clockwise rotation of the pull ring. The power transmission route is the pull ring, the buffer torsion spring, the connecting plate, the control camshaft, the input stage cam groove sleeve and the output stage cam groove sleeve, the shift fork pin shaft, the input stage shift fork clutch fork and the output stage shift fork clutch fork, the input stage shift fork clutch and the output stage shift fork clutch in sequence. The rotation of the control camshaft stores torque energy for the reset torsion spring, and the reset torsion spring releases torque energy when downshifting, so that the control camshaft rotates counterclockwise to realize downshift.

8. Type claim 1 here.

9. Type claim 2 here.

10. Type claim 3 here.

Images