Stepless gearbox based on gear transmission

Abstract

The invention discloses a continuously variable transmission based on gear transmission. The continuously variable transmission comprises a first bevel gear assembly, a second bevel gear assembly, a third bevel gear assembly, a first transmission assembly and a second transmission assembly. The first bevel gear assembly comprises a first bevel gear, a first planetary gear and a first gear shaft; the second bevel gear assembly comprises a second bevel gear, a second planetary gear and a second gear shaft; the third bevel gear assembly comprises a third bevel gear, a third planetary gear and a third gear shaft; the first bevel gear, the second bevel gear and the third bevel gear are the same; the first planetary gear, the second planetary gear and the third planetary gear are the same. The continuously variable transmission is driven by gears, the transmission ratio of the continuously variable transmission can be adjusted according to needs, the effect of changing the transmission ratio of the continuously variable transmission is close to that of a CVT continuously variable transmission, and the defects that efficiency is low, gear shifting is paused, large torque cannot be borne, and power is interrupted during gear shifting are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission system, in particular to a stepless gearbox based on gear transmission. BACKGROUND

[0002] At present, the existing conventional gearboxes include CVT (Continuously Variable Transmission) stepless gearbox, AT (Automatic Transmission) automatic gear gearbox, DCT (Dual Clutch Transmission) dual clutch gearbox, MT (Manual Transmission) manual gearbox, etc. Among them, the CVT stepless gearbox adopts two pairs of taper pulleys to drive steel belts or belts to rotate, and realizes stepless speed change by changing the mutual distance between the taper pulleys. The change means is mainly hydraulic. Therefore, the existing stepless gearbox has inherent disadvantages such as low efficiency and inability to withstand large torque. The existing AT automatic gear gearbox has disadvantages such as complex structure, high cost, low efficiency, and low gear jerk. The DCT dual clutch gearbox has disadvantages such as low-speed gear jerk and poor reliability. The MT manual gearbox has the disadvantage of power interruption during gear shifting.

[0003] In addition, the existing electric vehicles directly give up using the gearbox due to the consideration of structure, cost, volume and other factors, and only adopt a reduction mechanism with a fixed gear ratio, which leads to the defects of the existing electric vehicles such as poor climbing performance, poor economy at high speed, short range and the like.

[0004] In view of the above reasons, how to provide a stepless gearbox which can change the transmission ratio like the CVT stepless gearbox, and does not have the disadvantages of low efficiency, gear jerk, inability to withstand large torque, and power interruption during gear shifting, has become a problem to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a stepless gearbox based on gear transmission to overcome the above-mentioned defects and deficiencies of the prior art.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] Provided is a gear transmission-based stepless gearbox, which comprises a first bevel gear assembly, a second bevel gear assembly, a third bevel gear assembly, a first transmission assembly, and a second transmission assembly; the first bevel gear assembly, the second bevel gear assembly, and the third bevel gear assembly are identical; the first bevel gear assembly comprises a first bevel gear, a first planetary gear, and a first gear shaft; the second bevel gear assembly comprises a second bevel gear, a second planetary gear, and a second gear shaft; the third bevel gear assembly comprises a third bevel gear, a third planetary gear, and a third gear shaft; the first bevel gear, the second bevel gear, and the third bevel gear are identical; the first planetary gear, the second planetary gear, and the third planetary gear are identical; the first bevel gear, the second bevel gear, and the third bevel gear are all in the shape of a truncated cone, and the large ends of the three are arranged forward; the first planetary gear is arranged at the front end of the first bevel gear; the first gear shaft is fixedly arranged on the central axis of the first bevel gear and extends from the front and rear ends thereof; the first planetary gear is fixedly sleeved on the front end of the first gear shaft, and the first gear shaft extends from the front side of the first planetary gear; the first planetary gear and the first bevel gear are both pivoted on the first gear shaft; a first bevel gear is fixedly arranged on the surface of the first bevel gear, and the surface of the first bevel gear, except the first bevel gear, is a smooth surface without gear teeth; the first bevel gear comprises a plurality of gear teeth; the second planetary gear is arranged at the front end of the second bevel gear; the second gear shaft is fixedly arranged on the central axis of the second bevel gear and extends from the front and rear ends thereof; the second planetary gear is fixedly sleeved on the front end of the second gear shaft, and the second gear shaft extends from the front side of the second planetary gear; the second planetary gear and the second bevel gear are both pivoted on the second gear shaft; a second bevel gear is fixedly arranged on the surface of the second bevel gear, and the surface of the second bevel gear, except the second bevel gear, is a smooth surface without gear teeth; the second bevel gear comprises a plurality of gear teeth; the third planetary gear is arranged at the front end of the third bevel gear; the third gear shaft is fixedly arranged on the central axis of the third bevel gear and extends from the front and rear ends thereof; the third planetary gear is fixedly sleeved on the front end of the third gear shaft, and the third gear shaft extends from the front side of the third planetary gear; the third planetary gear and the third bevel gear are both pivoted on the third gear shaft; a third bevel gear is fixedly arranged on the surface of the third bevel gear, and the surface of the third bevel gear, except the third bevel gear, is a smooth surface without gear teeth; the third bevel gear comprises a plurality of gear teeth; the first transmission assembly comprises a sun gear, a first transmission shaft, and a first main bearing; the sun gear is in the shape of a disc; the rear end of the first transmission shaft is fixedly connected with the central position of the front side of the sun gear; the central position of the rear side of the sun gear is provided with a blind hole; the first main bearing is arranged in the blind hole; the first planetary gear, the second planetary gear, and the third planetary gear are all engaged with the sun gear; the second transmission assembly comprises a second transmission shaft and a driving gear; the driving gear is in the shape of a disc;The outer surface of the second transmission shaft is fixedly provided with two guide ribs, and the two guide ribs are symmetrically distributed; the center of the driving gear is fixedly provided with a cylindrical shaft sleeve, the shaft sleeve extends along the central axis of the driving gear, and the shaft sleeve extends from both sides of the driving gear; the shaft sleeve is coaxial with the driving gear; the center of the shaft sleeve is provided with a main shaft hole, two U-shaped guide grooves are arranged in the main shaft hole, and the two guide grooves are symmetrically arranged; a plurality of uniformly distributed gear teeth are fixedly arranged on the outer circumferential surface of the driving gear; the second transmission shaft penetrates into the main shaft hole of the shaft sleeve, and the two guide ribs of the second transmission shaft are respectively embedded into the two guide grooves of the main shaft hole, so that the driving gear can slide along the second transmission shaft by means of the shaft sleeve, and the second transmission shaft can drive the driving gear to rotate through the shaft sleeve; the first main bearing sleeve is arranged on the front end of the second transmission shaft, so that the second transmission shaft can rotate relative to the sun gear; the gear teeth of the driving gear can be engaged with the first bevel gear part, the second bevel gear part and the third bevel gear part; the rear end of the second transmission shaft is the power input end of the stepless gearbox, and external force drives the second transmission shaft to rotate; the second transmission shaft further drives the driving gear to rotate; the driving gear further drives the first bevel gear, the second bevel gear and the third bevel gear to rotate; the first bevel gear further drives the first planetary gear to rotate, the second bevel gear further drives the second planetary gear to rotate, and the third bevel gear further drives the third planetary gear to rotate; the first planetary gear, the second planetary gear and the third bevel gear further drive the sun gear to rotate; the sun gear further drives the first transmission shaft to rotate; the first transmission shaft is a power output shaft and can output power outward; the transmission ratio is adjusted by adjusting the front and rear positions of the driving gear along the second transmission shaft.

[0008] Preferably, the stepless gearbox further comprises an adjusting shift fork assembly, the adjusting shift fork assembly comprising a front wing plate, a rear wing plate, a second main bearing and a third main bearing; the lower parts of the front wing plate and the rear wing plate are in the shape of a circular ring body, and the lower part of the front wing plate is provided with a first through hole, and the lower part of the rear wing plate is provided with a second through hole; the upper end of the front wing plate is fixedly provided with a handle; the front wing plate is arranged on the front side of the driving gear, and the rear wing plate is arranged on the rear side of the driving gear; the front wing plate and the rear wing plate are buckled and fixedly connected; the second main bearing is arranged in the first through hole of the front wing plate, and the second main bearing is sleeved on the front end of the shaft sleeve; the third main bearing is arranged in the second through hole of the rear wing plate, and the third main bearing is sleeved on the rear end of the shaft sleeve; the second transmission shaft penetrates into the central hole of the second main bearing, the main shaft hole of the shaft sleeve of the driving gear and the central hole of the third main bearing, and the two guide ribs of the second transmission shaft are respectively embedded into the two guide grooves of the main shaft hole, so that the driving gear can slide along the second transmission shaft by means of the shaft sleeve, and the second transmission shaft can drive the driving gear to rotate through the shaft sleeve; the first main bearing is located on the front side of the front wing plate; the user drives the driving gear to move forward and backward along the second transmission shaft through the handle of the adjusting shift fork assembly, so as to adjust the front and rear positions of the driving gear along the second transmission shaft, and further adjust the transmission ratio.

[0009] Preferably, along the circumferential direction of the front end of the first bevel gear, the tooth width of the first helical gear portion gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the first helical gear portion and the axial direction of the first bevel gear gradually decreases to zero and then gradually increases from zero, wherein the teeth with a helix angle of zero are spur teeth, and the remaining teeth are helical teeth; along the circumferential direction of the front end of the second bevel gear, the tooth width of the second helical gear portion gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the second helical gear portion and the axial direction of the second bevel gear gradually decreases to zero and then gradually increases from zero, wherein the teeth with a helix angle of zero are spur teeth, and the remaining teeth are helical teeth; along the circumferential direction of the front end of the third bevel gear, the tooth width of the third helical gear portion gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the third helical gear portion and the axial direction of the third bevel gear gradually decreases to zero and then gradually increases from zero, wherein the teeth with a helix angle of zero are spur teeth, and the remaining teeth are helical teeth.

[0010] Preferably, along the axial direction of the drive gear, the teeth of the drive gear are thin on both sides and thick in the middle, and the two sides of the teeth of the drive gear are symmetrical; the cross section of the teeth of the drive gear is rhomboid or circular.

[0011] Preferably, the continuously variable transmission (CVT) further includes a housing assembly, which includes a front half-shell, a rear half-shell, and a base; the front half-shell and the rear half-shell are interlocked to form a complete hollow housing, and the front half-shell and the rear half-shell are fixedly connected; the lower parts of the first bevel gear assembly, the second bevel gear assembly, the third bevel gear assembly, the first transmission assembly, the second transmission assembly, and the adjusting fork assembly are all disposed in the internal cavity of the housing; a rectangular window is provided on the upper surface of the rear half-shell, the adjusting fork assembly is disposed in the window, and the upper end of the adjusting fork assembly extends upward through the window, with its handle located above the upper surface of the rear half-shell; the first drive shaft passes through the front half-shell and extends forward; the second drive shaft passes through the rear half-shell and extends backward; the upper end of the base is fixedly connected to the bottom of the rear half-shell, and the base is used to fix the CVT relative to the ground.

[0012] Preferably, the continuously variable transmission (CVT) further includes a first fixing component, which is triangularly radial. The first fixing component includes a first body, a first fixing arm, a second fixing arm, a third fixing arm, and a fourth main bearing. The first body is a triangular plate structure with a circular third through hole at its center. The first, second, and third fixing arms are identical and are all rectangular plate structures. The outer ends of the three prongs of the first body are fixedly connected to the inner ends of the first, second, and third fixing arms, respectively. The first, second, and third fixing arms extend radially outward from the center of the third through hole, and the included angle between any two adjacent first, second, and third fixing arms is 120°. The fourth main bearing is disposed in the third through hole of the first body part. The front end of the first drive shaft passes through the fourth main bearing and the third through hole of the first body part, and the front end of the first drive shaft protrudes from the front side of the first body part, so that the first drive shaft and the sun gear can rotate relative to the first fixed component. The front end of the first gear shaft is disposed at the outer end of the first fixed arm, and the first gear shaft can drive the first bevel gear and the first planetary gear to rotate relative to the first fixed arm. The front end of the second gear shaft is disposed at the outer end of the second fixed arm, and the second gear shaft can drive the second bevel gear and the second planetary gear to rotate relative to the second fixed arm. The front end of the third gear shaft is disposed at the outer end of the third fixed arm, and the third gear shaft can drive the third bevel gear and the third planetary gear to rotate relative to the third fixed arm.

[0013] Preferably, the first fixing component further includes a first clamp structure, a second clamp structure, and a third clamp structure; the first clamp structure is fixedly disposed at the outer end of the first fixing arm, the second clamp structure is fixedly disposed at the outer end of the second fixing arm, and the third clamp structure is fixedly disposed at the outer end of the third fixing arm; a semi-circular first opening is provided at the middle position of the outer end face of the first fixing arm; two first lugs are fixedly disposed at the outer end of the first fixing arm, the two first lugs are symmetrically arranged and protrude from both sides of the outer end face of the first fixing arm respectively, and a first threaded hole and a second threaded hole are respectively provided on the two first lugs; a semi-circular first groove is provided in the first opening; the first clamp structure includes a first clamp half; the first clamp half is generally arc-shaped, and its... A semi-circular second opening is provided in the middle; two symmetrical first ears are fixed at both ends of the first clamp half, and the two first ears are respectively provided with a third threaded hole and a fourth threaded hole; a semi-circular second groove is provided in the second opening; the two first ears of the first clamp half respectively fit into the two first protrusions of the first fixing arm, and the first opening is opposite to the second opening; the first fastening bolt passes through the third threaded hole, the first threaded hole and the first nut in sequence, and the internal threads of the third threaded hole, the first threaded hole and the first nut are all engaged with the external thread of the first fastening bolt; the second fastening bolt passes through the fourth threaded hole, the second threaded hole and the second nut in sequence, and the internal threads of the fourth threaded hole, the second threaded hole and the second nut are all engaged with the external thread of the first fastening bolt. All of them engage with the external threads of the second fastening bolt, so that the first clamp half is fixedly connected to the outer end of the first fixed arm, and the first opening and the second opening are joined to form a complete circular first front axle hole. The first front axle hole is formed by the first groove and the second groove joining to form a complete annular first bearing mounting groove. The first auxiliary bearing is set in the first front axle hole, and the outer ring of the first auxiliary bearing is fixedly set in the first bearing mounting groove. The first clamp half, two first lugs, the first opening, the second opening, the first groove, the second groove, the first fastening bolt, the second fastening bolt, the first nut, and the second nut constitute the first clamp structure. A semi-circular third opening is provided at the middle position of the outer end face of the second fixed arm. The outer end face of the second fixed arm is... Two second protrusions are fixedly provided at the end of the second fixed arm. The two second protrusions are symmetrically arranged and protrude to both sides along the outer end face of the second fixed arm. The two second protrusions are respectively provided with a fifth threaded hole and a sixth threaded hole. A semi-circular third groove is provided in the third opening. The second clamp structure includes a second clamp half. The second clamp half is generally arc-shaped, with a semi-circular fourth opening in the middle. Two symmetrical second ears are fixedly provided at both ends of the second clamp half, and the two second ears are respectively provided with a seventh threaded hole and an eighth threaded hole. A semi-circular fourth groove is provided in the fourth opening. The two second ears of the second clamp half are respectively fitted with the two second protrusions of the second fixed arm, and the third opening is opposite to the fourth opening.The third fastening bolt passes sequentially through the seventh threaded hole, the fifth threaded hole, and the third nut. The internal threads of the seventh threaded hole, the fifth threaded hole, and the third nut all engage with the external thread of the third fastening bolt. The fourth fastening bolt passes sequentially through the eighth threaded hole, the sixth threaded hole, and the fourth nut. The internal threads of the eighth threaded hole, the sixth threaded hole, and the fourth nut all engage with the external thread of the fourth fastening bolt. This secures the second clamp half to the outer end of the second fixing arm. The third and fourth openings combine to form a complete circular second front axle hole. Inside the second front axle hole, the third and fourth grooves combine to form a complete circular second bearing mounting groove. The second auxiliary bearing is installed inside the second front axle hole, and its outer ring is fixed. The second clamp structure consists of a second clamp half, two second ears, a third opening, a fourth opening, a third groove, a fourth groove, a third fastening bolt, a fourth fastening bolt, a third nut, and a fourth nut. A semi-circular fifth opening is located in the middle of the outer end face of the third fixed arm. Two third lugs are fixedly installed at the outer end of the third fixed arm, symmetrically arranged and protruding from both sides of the outer end face of the third fixed arm. A ninth threaded hole and a tenth threaded hole are respectively provided on the two third lugs. A semi-circular fifth groove is provided inside the fifth opening. The third clamp structure includes a third clamp half. The third clamp half is generally arc-shaped, with a semi-circular sixth opening in the middle. The two... The end is fixedly provided with two symmetrical third ears, and each of the two third ears is provided with an eleventh threaded hole and a twelfth threaded hole respectively; a semi-circular sixth groove is provided in the sixth opening; the two third ears of the third clamp half are respectively engaged with the two third protrusions of the third fixing arm, and the fifth opening is opposite to the sixth opening; the fifth fastening bolt passes through the eleventh threaded hole, the ninth threaded hole and the fifth nut in sequence, and the internal threads of the eleventh threaded hole, the ninth threaded hole and the fifth nut are engaged with the external thread of the fifth fastening bolt; the sixth fastening bolt passes through the twelfth threaded hole, the tenth threaded hole and the sixth nut in sequence, and the internal threads of the twelfth threaded hole, the tenth threaded hole and the sixth nut are engaged with the external thread of the sixth fastening bolt, so that the third clamp... The clamp half is fixedly connected to the outer end of the third fixed arm, and the fifth opening and the sixth opening are joined together to form a complete circular third front shaft hole. The third front shaft hole is formed by the fifth groove and the sixth groove joining together to form a complete circular third bearing mounting groove. The third auxiliary bearing is set in the third front shaft hole, and the outer ring of the third auxiliary bearing is fixedly set in the third bearing mounting groove. The third clamp half, the two third lugs, the fifth opening, the sixth opening, the fifth groove, the sixth groove, the fifth fastening bolt, the sixth fastening bolt, the fifth nut, and the sixth nut constitute the third clamp structure. The front end of the first gear shaft passes through the first auxiliary bearing and the first front shaft hole, so that the first gear shaft can drive the first bevel gear and the first planetary gear to rotate relative to the first fixed arm.The front end of the second gear shaft passes through the second bearing and the second front axle hole, enabling the second gear shaft to drive the second bevel gear and the second planetary gear to rotate relative to the second fixed arm; the front end of the third gear shaft passes through the third bearing and the third front axle hole, enabling the third gear shaft to drive the third bevel gear and the third planetary gear to rotate relative to the third fixed arm.

[0014] More preferably, the back side of the first body portion of the first fixing component arches towards its front side, so that the front side of the first body portion is an outwardly arched arc surface and its back side is an inwardly concave arc surface; the front sides of the first fixing arm, the second fixing arm and the third fixing arm are all smoothly transitioned and fixedly connected to the front side of the first body portion; the fixed connection points of the back sides of the first fixing arm, the second fixing arm and the third fixing arm with the back side of the first body portion all form a first included angle.

[0015] Preferably, the continuously variable transmission (CVT) further includes a second fixing component; the second fixing component is triangularly radial and includes a second body, a fourth fixing arm, a fifth fixing arm, a sixth fixing arm, and a fifth main bearing; the second body is a triangular plate structure with a circular fourth through hole at its center; the fourth, fifth, and sixth fixing arms are identical and are all rectangular plate structures; the outer ends of the three prongs of the second body are fixedly connected to the inner ends of the fourth, fifth, and sixth fixing arms respectively; the fourth, fifth, and sixth fixing arms all extend radially outward from the center of the fourth through hole, and any two adjacent fourth, fifth, and sixth fixing arms... The included angle between them is 120°; the fifth main bearing is disposed in the fourth through hole of the second body, the rear end of the second drive shaft passes through the fifth main bearing and the fourth through hole of the second body, and the rear end of the second drive shaft protrudes from the rear side of the second body, so that the second drive shaft and the drive gear can rotate relative to the second fixed assembly; the rear end of the first gear shaft is disposed at the outer end of the fourth fixed arm, and the first gear shaft can drive the first bevel gear to rotate relative to the fourth fixed arm; the rear end of the second gear shaft is disposed at the outer end of the fifth fixed arm, and the second gear shaft can drive the second bevel gear to rotate relative to the fifth fixed arm; the rear end of the third gear shaft is disposed at the outer end of the sixth fixed arm, and the third gear shaft can drive the third bevel gear to rotate relative to the sixth fixed arm.

[0016] More preferably, the second fixing component further includes a fourth clamp structure, a fifth clamp structure, and a sixth clamp structure; the fourth clamp structure is fixedly disposed at the outer end of the fourth fixing arm, the fifth clamp structure is fixedly disposed at the outer end of the fifth fixing arm, and the sixth clamp structure is fixedly disposed at the outer end of the sixth fixing arm; a semi-circular seventh opening is provided at the middle position of the outer end face of the fourth fixing arm; two fourth lugs are fixedly disposed at the outer end of the fourth fixing arm, the two fourth lugs are symmetrically disposed and protrude from both sides of the outer end face of the fourth fixing arm respectively, and the two fourth lugs are respectively provided with a thirteenth threaded hole and a fourteenth threaded hole; a semi-circular seventh groove is provided in the seventh opening; the fourth clamp structure includes a fourth clamp half; the fourth clamp half is generally arc-shaped. The fourth clamp half has a semi-circular eighth opening in the middle; two symmetrical fourth ears are fixed at both ends of the fourth clamp half, and the two fourth ears are respectively provided with a fifteenth threaded hole and a sixteenth threaded hole; a semi-circular eighth groove is provided in the eighth opening; the two fourth ears of the fourth clamp half are respectively engaged with the two fourth protrusions of the fourth fixing arm, and the seventh opening is opposite to the eighth opening; the seventh fastening bolt passes through the fifteenth threaded hole, the thirteenth threaded hole and the seventh nut in sequence, and the internal threads of the fifteenth threaded hole, the thirteenth threaded hole and the seventh nut are engaged with the external thread of the seventh fastening bolt; the eighth fastening bolt passes through the sixteenth threaded hole, the fourteenth threaded hole and the eighth nut in sequence. The internal threads of all three components engage with the external threads of the eighth fastening bolt, thus fixing the fourth clamp half to the outer end of the fourth fixed arm. The seventh and eighth openings combine to form a complete circular first rear shaft hole. Inside the first rear shaft hole, the seventh and eighth grooves combine to form a complete annular fourth bearing mounting groove. The fourth auxiliary bearing is located within the first rear shaft hole, and its outer ring is fixedly positioned within the fourth bearing mounting groove. The fourth clamp half, two fourth lugs, the seventh and eighth openings, the seventh and eighth grooves, the seventh and eighth fastening bolts, the seventh nut, and the eighth nut constitute the fourth clamp structure. A semi-circular ninth opening is located in the middle of the outer end face of the fifth fixed arm. The fifth fixed arm... Two fifth lugs are fixedly provided at the outer end. These two fifth lugs are symmetrically arranged and protrude to both sides of the outer end face of the fifth fixed arm. The two fifth lugs are respectively provided with a seventeenth threaded hole and an eighteenth threaded hole. A semi-circular ninth groove is provided in the ninth opening. The fifth clamp structure includes a fifth clamp half. The fifth clamp half is generally arc-shaped, with a semi-circular tenth opening in the middle. Two symmetrical fifth ears are fixedly provided at both ends of the fifth clamp half, and the two fifth ears are respectively provided with a nineteenth threaded hole and a twentieth threaded hole. A semi-circular tenth groove is provided in the tenth opening. The two fifth ears of the fifth clamp half are respectively fitted with the two fifth lugs of the fifth fixed arm, and the ninth opening is opposite to the tenth opening.The ninth fastening bolt passes sequentially through the nineteenth threaded hole, the seventeenth threaded hole, and the ninth nut. The internal threads of the nineteenth threaded hole, the seventeenth threaded hole, and the ninth nut all engage with the external thread of the ninth fastening bolt. The tenth fastening bolt passes sequentially through the twentieth threaded hole, the eighteenth threaded hole, and the tenth nut. The internal threads of the twentieth threaded hole, the eighteenth threaded hole, and the tenth nut all engage with the external thread of the tenth fastening bolt, thus fixing the fifth clamp half to the outer end of the fifth fixing arm. The ninth and tenth openings combine to form a complete circular second rear axle hole. Inside the second rear axle hole, the ninth and tenth grooves combine to form a complete annular fifth bearing mounting groove. The fifth auxiliary bearing is installed inside the second rear axle hole, and the fifth auxiliary bearing... The outer ring of the bearing is fixedly installed in the fifth bearing mounting groove; the fifth clamp half, two fifth lugs, the ninth opening, the tenth opening, the ninth groove, the tenth groove, the ninth fastening bolt, the tenth fastening bolt, the ninth nut, and the tenth nut constitute the fifth clamp structure; a semi-circular eleventh opening is provided in the middle of the outer end face of the sixth fixing arm; two sixth lugs are fixedly installed on the outer end of the sixth fixing arm, the two sixth lugs are symmetrically arranged and protrude from both sides of the outer end face of the sixth fixing arm, and the two sixth lugs are respectively provided with a twenty-first threaded hole and a twenty-second threaded hole; a semi-circular eleventh groove is provided in the eleventh opening; the sixth clamp structure includes a sixth clamp half; the sixth clamp half is generally arc-shaped, with a semi-circular groove in the middle. The twelfth opening is shaped like a ring; two symmetrical sixth ears are fixed at both ends of the sixth clamp half, and the two sixth ears are respectively provided with a twenty-third threaded hole and a twenty-fourth threaded hole; a semi-circular twelfth groove is provided in the twelfth opening; the two sixth ears of the sixth clamp half are respectively fitted with the two sixth protrusions of the sixth fixing arm, and the eleventh opening is opposite to the twelfth opening; the eleventh fastening bolt passes through the twenty-third threaded hole, the twenty-first threaded hole and the eleventh nut in sequence, and the internal threads of the twenty-third threaded hole, the twenty-first threaded hole and the eleventh nut are all engaged with the external thread of the eleventh fastening bolt; the twelfth fastening bolt passes through the twenty-fourth threaded hole, the twenty-second threaded hole and the twelfth nut in sequence, and the twenty-fourth thread... The internal threads of the twentieth threaded hole, the twentieth threaded hole, and the twelfth nut all engage with the external threads of the twelfth fastening bolt, thus fixing the sixth clamp half to the outer end of the sixth fixed arm. The eleventh opening and the twelfth opening are joined together to form a complete circular third rear shaft hole. Inside the third rear shaft hole, the eleventh groove and the twelfth groove are joined together to form a complete circular sixth bearing mounting groove. The sixth auxiliary bearing is set in the third rear shaft hole, and the outer ring of the sixth auxiliary bearing is fixedly set in the sixth bearing mounting groove. The sixth clamp half, the two sixth lugs, the eleventh opening, the twelfth opening, the eleventh groove, the twelfth groove, the eleventh fastening bolt, the twelfth fastening bolt, the eleventh nut, and the twelfth nut constitute the sixth clamp structure.The rear end of the first gear shaft passes through the fourth bearing and the first rear axle hole, enabling the first gear shaft to drive the first bevel gear to rotate relative to the fourth fixed arm; the rear end of the second gear shaft passes through the fifth bearing and the second rear axle hole, enabling the second gear shaft to drive the second bevel gear to rotate relative to the fifth fixed arm; the rear end of the third gear shaft passes through the sixth bearing and the third rear axle hole, enabling the third gear shaft to drive the third bevel gear to rotate relative to the sixth fixed arm.

[0017] More preferably, the back of the second body portion arches towards its front, so that the front of the second body portion is an outwardly arched arc surface, and its back is an inwardly concave arc surface; the front of the fourth, fifth, and sixth fixing arms are all smoothly transitioned and fixedly connected to the front of the second body portion; the fixed connection points between the back of the fourth, fifth, and sixth fixing arms and the back of the second body portion all form a second included angle.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The continuously variable transmission (CVT) based on gear transmission provided by the present invention includes a first conical gear assembly, a second conical gear assembly, a third conical gear assembly, a first transmission assembly, and a second transmission assembly; the first conical gear assembly includes a first conical gear, a first planetary gear, and a first gear shaft; the second conical gear assembly includes a second conical gear, a second planetary gear, and a second gear shaft; the third conical gear assembly includes a third conical gear, a third planetary gear, and a third gear shaft; the first transmission assembly includes a sun gear, a first transmission shaft, and a first main bearing; the first... The planetary gear, the second planetary gear, and the third planetary gear all mesh with the sun gear; the second transmission assembly includes a second transmission shaft and a drive gear; two guide ridges are fixedly provided on the outer surface of the second transmission shaft, and the two guide ridges are symmetrically distributed; a cylindrical bushing is fixedly provided at the center of the drive gear, the bushing extends along the central axis of the drive gear, and the bushing extends from both sides of the drive gear; the bushing is coaxial with the drive gear; a main shaft hole is provided at the center of the bushing, and two U-shaped guide grooves are provided in the main shaft hole, and the two guide grooves are symmetrically arranged; several... The gear has evenly distributed teeth; the second drive shaft passes through the main shaft hole of the bushing, and two guide ridges of the second drive shaft are respectively embedded in two guide grooves of the main shaft hole, so that the drive gear can slide along the second drive shaft with the help of its bushing, and the second drive shaft can drive the drive gear to rotate via the bushing; the first main bearing is sleeved on the front end of the second drive shaft, so that the second drive shaft can rotate relative to the sun gear; the teeth of the drive gear can mesh with the first helical tooth portion, the second helical tooth portion, and the third helical tooth portion; the rear end of the second drive shaft is the power input end of the continuously variable transmission, and external force drives the second drive gear. The shaft rotates; the second transmission shaft then drives the drive gear to rotate; the drive gear then drives the first bevel gear, the second bevel gear, and the third bevel gear to rotate; the first bevel gear then drives the first planetary gear to rotate, the second bevel gear then drives the second planetary gear to rotate, and the third bevel gear then drives the third planetary gear to rotate; the first planetary gear, the second planetary gear, and the third bevel gear then drive the sun gear to rotate; the sun gear then drives the first transmission shaft to rotate; the first transmission shaft is a power output shaft and can output power outward; the transmission ratio is adjusted by adjusting the position of the drive gear along the front and rear of the second transmission shaft.

[0020] (2) The continuously variable transmission based on gear transmission provided by the present invention further includes an adjusting shift fork assembly, which includes a front wing plate, a rear wing plate, a second main bearing and a third main bearing; a handle is fixedly provided at the upper end of the front wing plate; the front wing plate and the rear wing plate are respectively provided on both sides of the drive gear; the front wing plate and the rear wing plate are fastened together and fixedly connected; the user drives the drive gear to move back and forth along the second transmission shaft by adjusting the handle of the adjusting shift fork assembly, thereby adjusting the back and forth position of the drive gear along the second transmission shaft and thus adjusting the transmission ratio.

[0021] (3) The continuously variable transmission (CVT) based on gear transmission provided by this invention can achieve a large number of effective gears. Its effect of changing the transmission ratio is close to that of a CVT, and it does not have the disadvantages of other types of transmissions such as low efficiency, shift jerking, inability to withstand large torque, and power interruption during shifting. Compared with existing transmissions, the continuously variable transmission has the advantages of simple structure, small size, light weight, and low cost. It can be directly installed on electric vehicles and can solve problems such as poor climbing performance, poor economy at high speeds, and short range of electric vehicles. Attached Figure Description

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Figure 1 and Figure 2 A three-dimensional schematic diagram of a continuously variable transmission based on gear transmission provided for an embodiment of the present invention;

[0024] Figure 3 and Figure 4 A three-dimensional schematic diagram of a bevel gear assembly of a continuously variable transmission based on gear transmission provided for an embodiment of the present invention. Figure 3 To view from the front, Figure 4 (For viewing from the rear);

[0025] Figure 5 An exploded view of a continuously variable transmission based on gear transmission provided for an embodiment of the present invention (some components are not shown);

[0026] Figure 6 A partially exploded view of the connection between the first transmission component and the second transmission component of a continuously variable transmission based on gear transmission provided in an embodiment of the present invention.

[0027] Figure 7 A three-dimensional schematic diagram of the meshing of the sun gear and three planetary gears in a continuously variable transmission based on gear transmission provided for an embodiment of the present invention.

[0028] Figure 8 , Figure 9 and Figure 10 These are, respectively, a three-dimensional schematic diagram, a front view, and a side view of the drive gear of the second transmission component of the continuously variable transmission based on gear transmission provided in an embodiment of the present invention;

[0029] Figures 11 to 16 A schematic diagram illustrating the meshing state of the three bevel gears and the drive gear in a continuously variable transmission based on gear transmission provided in this embodiment of the invention. Figure 11 , Figure 12 and Figure 13 The image shown is viewed from the front. Figure 14, Figure 15 and Figure 16 (As shown in the rear view);

[0030] Figure 17 An exploded view of the first fixed component of a continuously variable transmission based on gear transmission provided in an embodiment of the present invention;

[0031] Figure 18 and Figure 19 These are exploded and three-dimensional schematic diagrams of the second fixed component of the continuously variable transmission based on gear transmission provided in the embodiments of the present invention.

[0032] Figure 20 and Figure 21 A three-dimensional schematic diagram of a continuously variable transmission (including a housing) based on gear transmission provided for an embodiment of the present invention. Figure 20 The image shown is viewed from the front. Figure 21 (The image shown is from the rear). Detailed Implementation

[0033] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a continuously variable transmission (CVT) based on gear transmission. The CVT includes a first bevel gear assembly 10, a second bevel gear assembly 20, a third bevel gear assembly 30, a first transmission assembly 40, and a second transmission assembly 50. The first bevel gear assembly 10, the second bevel gear assembly 20, and the third bevel gear assembly 30 are identical.

[0035] like Figure 3 and Figure 4 As shown, the first bevel gear assembly 10 includes a first bevel gear 11, a first planetary gear 12, and a first gear shaft 13; the second bevel gear assembly 20 includes a second bevel gear 21, a second planetary gear 22, and a second gear shaft 23; the third bevel gear assembly 30 includes a third bevel gear 31, a third planetary gear 32, and a third gear shaft 33. The first bevel gear 11, the second bevel gear 21, and the third bevel gear 31 are identical; the first planetary gear 12, the second planetary gear 22, and the third planetary gear 32 are also identical.

[0036] The first bevel gear 11 is truncated cone-shaped with its large end facing forward; the first planetary gear 12 is disposed at the front end of the first bevel gear 11; the first gear shaft 13 is fixedly disposed on the central axis of the first bevel gear 11 and extends from its front and rear ends; the first planetary gear 12 is fixedly sleeved on the front end of the first gear shaft 13, and the first gear shaft 13 extends from the front side of the first planetary gear 12; both the first planetary gear 12 and the first bevel gear 11 use the first gear shaft 13 as their axis of rotation; the first helical tooth portion 14 is fixedly disposed on the surface of the first bevel gear 11, and the area of ​​the surface of the first bevel gear 11 other than the first helical tooth portion 14 is a smooth surface without teeth.

[0037] The first helical gear 14 includes a plurality of teeth; along the circumferential direction of the front end (i.e., the large end) of the first bevel gear 11, the tooth width of the teeth of the first helical gear 14 gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the teeth of the first helical gear 14 and the axial direction of the first bevel gear 11 gradually decreases to zero (when the tooth direction of the teeth of the first helical gear 14 is parallel to the axial direction of the first bevel gear 11, the helix angle is zero), and then gradually increases from zero, wherein the teeth with a helix angle of zero are straight teeth, and the remaining teeth are helical teeth (most of the teeth of the first helical gear 14 are helical teeth, that is, the tooth direction of most of the teeth is not parallel to the axial direction of the first bevel gear 11).

[0038] The second bevel gear 21 is truncated cone-shaped with its large end facing forward; the second planetary gear 22 is disposed at the front end of the second bevel gear 21; the second gear shaft 23 is fixedly disposed on the central axis of the second bevel gear 21 and extends from its front and rear ends; the second planetary gear 22 is fixedly sleeved on the front end of the second gear shaft 23, and the second gear shaft 23 extends from the front side of the second planetary gear 22; both the second planetary gear 22 and the second bevel gear 21 use the second gear shaft 23 as their axis of rotation; the second helical tooth portion 24 is fixedly disposed on the surface of the second bevel gear 21, and the area of ​​the surface of the second bevel gear 21 other than the second helical tooth portion 24 is a smooth surface without teeth.

[0039] The second helical gear 24 includes a plurality of teeth; along the circumferential direction of the front end (i.e., the large end) of the second bevel gear 21, the tooth width of the teeth of the second helical gear 24 gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the teeth of the second helical gear 24 and the axial direction of the second bevel gear 21 gradually decreases to zero (when the tooth direction of the teeth of the second helical gear 24 is parallel to the axial direction of the second bevel gear 21, the helix angle is zero), and then gradually increases from zero, wherein the teeth with a helix angle of zero are spur teeth, and the remaining teeth are helical teeth (most of the teeth of the second helical gear 24 are helical teeth, that is, the tooth direction of most of the teeth is not parallel to the axial direction of the second bevel gear 21).

[0040] The third bevel gear 31 is truncated cone-shaped with its large end facing forward; the third planetary gear 32 is disposed at the front end of the third bevel gear 31; the third gear shaft 33 is fixedly disposed on the central axis of the third bevel gear 31 and extends from its front and rear ends; the third planetary gear 32 is fixedly sleeved on the front end of the third gear shaft 33, and the third gear shaft 33 extends from the front side of the third planetary gear 32; both the third planetary gear 32 and the third bevel gear 31 use the third gear shaft 33 as their axis of rotation; the third helical tooth portion 34 is fixedly disposed on the surface of the third bevel gear 31, and the area of ​​the surface of the third bevel gear 31 other than the third helical tooth portion 34 is a smooth surface without teeth.

[0041] The third helical gear 34 includes a number of teeth; along the circumferential direction of the front end (i.e., the large end) of the third bevel gear 31, the tooth width of the teeth of the third helical gear 34 gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the teeth of the third helical gear 34 and the axial direction of the third bevel gear 31 gradually decreases to zero (when the tooth direction of the teeth of the third helical gear 34 is parallel to the axial direction of the third bevel gear 31, the helix angle is zero), and then gradually increases from zero. Among them, the teeth with a helix angle of zero are straight teeth, and the remaining teeth are helical teeth (most of the teeth of the third helical gear 34 are helical teeth, that is, the tooth direction of most of the teeth is not parallel to the axial direction of the third bevel gear 31).

[0042] like Figure 5 , Figure 6 , Figure 7 As shown, the first transmission assembly 40 includes a sun gear 41, a first transmission shaft 42, and a first main bearing 43. The sun gear 41 is generally disc-shaped; the rear end of the first transmission shaft 42 is fixedly connected to the center of the front side of the sun gear 41; a blind hole 44 is provided at the center of the rear side of the sun gear 41; the first main bearing 43 is disposed in the blind hole 44; the first planetary gear 12, the second planetary gear 22, and the third planetary gear 32 all mesh with the sun gear 41.

[0043] like Figure 5 , Figure 8 , Figure 9 and Figure 10As shown, the second transmission assembly 50 includes a second transmission shaft 51 and a drive gear 52. The drive gear 52 is generally disc-shaped. Two guide ridges 51-1 are fixedly provided on the outer surface of the second transmission shaft 51, and the two guide ridges 51-1 are symmetrically distributed. A cylindrical bushing 52-1 is fixedly provided at the center of the drive gear 52. The bushing 52-1 extends along the central axis of the drive gear 52 and protrudes from both sides of the drive gear 52; the bushing 52-1 is coaxial with the drive gear 52; a main shaft hole 52-2 is provided at the center of the bushing 52-1, and two U-shaped guide grooves 52-3 are provided in the main shaft hole 52-2, and the two guide grooves 52-3 are symmetrically arranged; a number of evenly distributed gear teeth 52-4 are fixedly provided on the outer circumference of the drive gear 52.

[0044] The second drive shaft 51 passes through the main shaft hole 52-2 of the bushing 52-1, and the two guide protrusions 51-1 of the second drive shaft 51 are respectively embedded in the two guide grooves 52-3 of the main shaft hole 52-2, so that the drive gear 52 can slide along the second drive shaft 51 with the help of its bushing 52-1, and the second drive shaft 51 can drive the drive gear 52 to rotate via the bushing 52-1; the first main bearing 43 is sleeved on the front end of the second drive shaft 51, so that the second drive shaft 51 can rotate relative to the sun gear 41. In this embodiment, for example, the first main bearing 43 includes an inner ring and an outer ring. The inner ring of the first main bearing 43 is fixedly connected to the front end of the second drive shaft 51, and the outer ring of the first main bearing 43 is fixedly disposed in the blind hole 44. In a preferred embodiment of this invention, along the axial direction of the drive gear 52, the teeth 52-4 of the drive gear 52 are thinner on both sides and thicker in the middle, and the two sides of the teeth 52-4 of the drive gear 52 are symmetrical; the cross-section of the teeth 52-4 of the drive gear 52 is rhomboid or circular. The teeth 52-4 of the drive gear 52 can mesh with the first helical tooth portion 14 of the first bevel gear 11, the second helical tooth portion 24 of the second bevel gear 21, and the third helical tooth portion 34 of the third bevel gear 31.

[0045] The rear end of the second drive shaft 51 is the power input end of the continuously variable transmission (CVT). External force drives the second drive shaft 51 to rotate; the second drive shaft 51 then drives the drive gear 52 to rotate; the drive gear 52 then drives the first bevel gear 11, the second bevel gear 21, and the third bevel gear 31 to rotate; the first bevel gear 11 then drives the first planetary gear 12 to rotate, the second bevel gear 21 then drives the second planetary gear 22 to rotate, and the third bevel gear 31 then drives the third planetary gear 32 to rotate; the first planetary gear 12, the second planetary gear 22, and the third bevel gear 31 then drive the sun gear 41 to rotate; the sun gear 41 then drives the first drive shaft 42 to rotate; the first drive shaft 42 is the power output shaft of the CVT and can output power outward; the transmission ratio of the CVT is adjusted by adjusting the position of the drive gear 52 along the front and rear of the second drive shaft 51.

[0046] Figures 11 to 16 The meshing state of the first bevel gear 11, the second bevel gear 21, and the third bevel gear 31 with the drive gear 52 is shown. Viewed from the front, the drive gear 52 rotates clockwise, for example, while the first bevel gear 11, the second bevel gear 21, and the third bevel gear 31 all rotate counterclockwise, for example. Correspondingly, viewed from the rear, the drive gear 52 rotates counterclockwise, for example, while the first bevel gear 11, the second bevel gear 21, and the third bevel gear 31 all rotate clockwise, for example. First state: as shown... Figure 11 (Viewed from the front) and Figure 14 (Viewed from the rear) As shown, the second helical tooth 24 of the second bevel gear 21 can mesh with the gear teeth 52-4 of the drive gear 52, while the first helical tooth 14 of the first bevel gear 11 and the third helical tooth 34 of the third bevel gear 31 cannot mesh with the gear teeth 52-4 of the drive gear 52; Second state: as Figure 12 (Viewed from the front) and Figure 15 (Viewed from the rear) As shown, the first helical tooth 14 of the first bevel gear 11 can mesh with the gear teeth 52-4 of the drive gear 52, while the second helical tooth 24 of the second bevel gear 21 and the third helical tooth 34 of the third bevel gear 31 cannot mesh with the gear teeth 52-4 of the drive gear 52; Third state: as shown Figure 13 As shown (viewed from the front) and Figure 16(Viewed from the rear), the third helical tooth 34 of the third bevel gear 31 can mesh with the tooth 52-4 of the drive gear 52, while the first helical tooth 14 of the first bevel gear 11 and the second helical tooth 24 of the second bevel gear 21 cannot mesh with the tooth 52-4 of the drive gear 52. The cycle continues from the first state to the second state, then to the third state, and finally back to the first state. It should be noted that when the drive gear 52 rotates, at any given moment, it can mesh with any one of the three bevel gears—the first bevel gear 11, the second bevel gear 21, and the third bevel gear 31—to achieve continuous power transmission, but the drive gear 52 cannot mesh with all three simultaneously. In the transition states between the first and second states, the transition states between the second and third states, and the transition states between the third and first states, the drive gear 52 can mesh with any two of the first bevel gear 11, the second bevel gear 21, and the third bevel gear 31.

[0047] like Figure 5As shown, in a preferred embodiment of this example, the continuously variable transmission based on gear transmission further includes an adjusting fork assembly 60. The adjusting fork assembly 60 includes a front wing plate 61, a rear wing plate 62, a second main bearing 63, and a third main bearing 64. The lower parts of the front wing plate 61 and the rear wing plate 62 are both annular in shape, and the lower part of the front wing plate 61 is provided with a first through hole 65, and the lower part of the rear wing plate 62 is provided with a second through hole 66. A handle 67 is fixedly provided at the upper end of the front wing plate 61. In this embodiment, for example, the extension direction of the handle 67 is perpendicular to the extension direction of the front wing plate 61, and the extension direction of the handle 67 is along the axial direction of the second transmission shaft 51. The front wing plate 61 is located on the front side of the drive gear 52, and the rear wing plate 62 is located on the rear side of the drive gear 52; the front wing plate 61 and the rear wing plate 62 are fastened together and fixedly connected, for example, the upper part of the front wing plate 61 is fixedly connected to the upper part of the rear wing plate 62 by bolts; the second main bearing 63 is located in the first through hole 65 of the front wing plate 61, and the second main bearing 63 is sleeved on the front end of the bushing 52-1, so that the bushing 52-1 and the drive gear 52 can rotate relative to the front wing plate 61; In this embodiment, for example, the second main bearing 63 includes an inner ring and an outer ring. The inner ring of the second main bearing 63 is fixedly connected to the front end of the bushing 52-1, and the outer ring of the second main bearing 63 is fixedly disposed in the first through hole 65 of the front wing plate 61. The third main bearing 64 is disposed in the second through hole 66 of the rear wing plate 62, and the third main bearing 64 is sleeved on the rear end of the bushing 52-1, so that the bushing 52-1 and the drive gear 52 can rotate relative to the rear wing plate 62. In this embodiment, for example, the second main bearing 63 includes an inner ring and an outer ring. The inner ring of the second main bearing 63 is fixedly connected to the front end of the bushing 52-1, and the outer ring of the second main bearing 63 is fixedly disposed in the first through hole 65 of the front wing plate 61. The three main bearings 64 include an inner ring and an outer ring. The inner ring of the third main bearing 64 is fixedly connected to the rear end of the bushing 52-1, and the outer ring of the third main bearing 64 is fixedly disposed in the second through hole 66 of the rear wing plate 62. The second drive shaft 51 passes through the central hole of the second main bearing 63, the main shaft hole 52-2 of the bushing 52-1 of the drive gear 52, and the central hole of the third main bearing 64. The two guide protrusions 51-1 of the second drive shaft 51 are respectively embedded in the two guide grooves 52-3 of the main shaft hole 52-2, so that the drive gear 52 can slide along the second drive shaft 51 with the help of its bushing 52-1, and the second drive shaft 51 can drive the drive gear 52 to rotate relative to the adjusting fork assembly 60 via the bushing 52-1. The user drives the drive gear 52 to move back and forth along the second drive shaft 51 by adjusting the handle 67 of the adjusting fork assembly 60, thereby adjusting the back and forth position of the drive gear 52 along the second drive shaft 51, and thus adjusting the transmission ratio of the continuously variable transmission. The first main bearing 43 is sleeved on the front end of the second drive shaft 51, and the first main bearing 43 is located on the front side of the front wing plate 61, so that the second drive shaft 51 can rotate relative to the sun gear 41.

[0048] like Figure 5 and Figure 17As shown, in a preferred embodiment of this example, the continuously variable transmission based on gear transmission further includes a first fixing component 70; the first fixing component 70 is triangularly radial and includes a first body 71, a first fixing arm 72, a second fixing arm 73, a third fixing arm 74, a fourth main bearing 75, a first clamp structure, a second clamp structure, and a third clamp structure.

[0049] The first body part 71 is a three-pronged plate structure with a circular third through hole 71-1 at its center; the first fixing arm 72, the second fixing arm 73, and the third fixing arm 74 are identical and are all rectangular plate structures; the outer ends (i.e., the ends) of the three prongs of the first body part 71 are fixedly connected to the inner ends of the first fixing arm 72, the second fixing arm 73, and the third fixing arm 74, respectively; the first fixing arm 72, the second fixing arm 73, and the third fixing arm 74 all extend radially outward from the center of the third through hole 71-1, and the included angle between any two adjacent first fixing arms 72, the second fixing arm 73, and the third fixing arm 74 is 120°. The first clamp structure is fixedly installed at the outer end of the first fixing arm 72 (i.e., the end away from the first body part 71), the second clamp structure is fixedly installed at the outer end of the second fixing arm 73 (i.e., the end away from the first body part 71), and the third clamp structure is fixedly installed at the outer end of the third fixing arm 74 (i.e., the end away from the first body part 71).

[0050] In a preferred embodiment of this example, the back side (i.e., rear end) of the first body portion 71 arches towards its front side (i.e., front end), such that the front side of the first body portion 71 has an outwardly arched arc-shaped surface, and its back side has an inwardly concave arc-shaped surface. The front sides of the first fixing arm 72, the second fixing arm 73, and the third fixing arm 74 are all smoothly transitioned and fixedly connected to the front side of the first body portion 71; the fixed connection points between the back sides of the first fixing arm 72, the second fixing arm 73, and the third fixing arm 74 and the back side of the first body portion 71 all form a first included angle (i.e., the fixed connection points on the back sides form a bend, rather than a smooth transition).

[0051] In a further preferred embodiment of this example, on the back side of the first body portion 71, a first reinforcing rib 72-6 is fixedly provided at the connection between the first fixing arm 72 and the first body portion 71, a second reinforcing rib 73-6 is fixedly provided at the connection between the second fixing arm 73 and the first body portion 71, and a third reinforcing rib 74-6 is fixedly provided at the connection between the third fixing arm 74 and the first body portion 71. The first reinforcing rib 72-6, the second reinforcing rib 73-6, and the third reinforcing rib 74-6 are used to increase the strength of the connection. In this embodiment, for example, the first reinforcing rib 72-6, the second reinforcing rib 73-6, and the third reinforcing rib 74-6 are all isosceles triangles.

[0052] A semi-circular first opening 72-1 is provided at the middle position of the outer end face of the first fixed arm 72; two first lugs 72-2 are fixedly provided at the outer end of the first fixed arm 72, which are symmetrically arranged and protrude from both sides of the outer end face of the first fixed arm 72 respectively. A first threaded hole 72-3 and a second threaded hole 72-4 are respectively provided on the two first lugs 72-2; a semi-circular first groove 72-5 is provided in the first opening 72-1; the first clamp structure includes a first clamp half 76; the first clamp half 76 is generally arc-shaped, with a semi-circular second opening 76-1 in the middle; two symmetrical first ears 76-2 are fixedly provided at both ends of the first clamp half 76, and a third threaded hole 76-3 and a fourth threaded hole 76-4 are respectively provided on the two first ears 76-2; a semi-circular second groove (not shown in the figure) is provided in the second opening 76-1. The two first ears 76-2 of the first clamp half 76 respectively fit against the two first lugs 72-2 of the first fixing arm 72, and the first opening 72-1 is opposite to the second opening 76-1; the first fastening bolt 76-5 passes through the third threaded hole 76-3, the first threaded hole 72-3 and the first nut 76-7 in sequence, and the internal threads of the third threaded hole 76-3, the first threaded hole 72-3 and the first nut 76-7 are all engaged with the external thread of the first fastening bolt 76-5; the second fastening bolt 76-6 passes through the fourth threaded hole 76-4, the second threaded hole 72-4 and the second nut 76-8 in sequence, and the internal threads of the fourth threaded hole 76-4, the second threaded hole 72-4 and the second nut 76-8 are all engaged with the external thread of the second fastening bolt 76-6. The first clamp half 76 is fixedly connected to the outer end of the first fixed arm 72, and the first opening 72-1 and the second opening 76-1 are joined together to form a complete circular first front axle hole. The first front axle hole is formed by the first groove 72-5 and the second groove (not shown in the figure) joining together to form a complete annular first bearing mounting groove. The first auxiliary bearing (not shown in the figure) is set in the first front axle hole, and the outer ring of the first auxiliary bearing is fixedly set in the first bearing mounting groove. The first clamp half 76, the two first lugs 72-2, the first opening 72-1, the second opening 76-1, the first groove 72-5, the second groove, the first fastening bolt 76-5, the second fastening bolt 76-6, the first nut 76-7, and the second nut 76-8 constitute the first clamp structure.

[0053] The second fixed arm 73 has a semi-circular third opening 73-1 at the middle of its outer end face; two second lugs 73-2 are fixedly provided at the outer end of the second fixed arm 73, which are symmetrically arranged and protrude from the outer end face of the second fixed arm 73 to both sides, and are respectively provided with a fifth threaded hole 73-3 and a sixth threaded hole 73-4 on the two second lugs 73-2; a semi-circular third groove 73-5 is provided in the third opening 73-1; the second clamp structure includes a second clamp half 77; the second clamp half 77 is generally arc-shaped, with a semi-circular fourth opening 77-1 in the middle, and two symmetrical second ears 77-2 are fixedly provided at both ends of the second clamp half 77, and are respectively provided with a seventh threaded hole 77-3 and an eighth threaded hole 77-4 on the two second ears 77-2; a semi-circular fourth groove 77-5 is provided in the fourth opening 77-1. The two second ears 77-2 of the second clamp half 77 respectively engage with the two second lugs 73-2 of the second fixing arm 73, and the third opening 73-1 is opposite to the fourth opening 77-1; the third fastening bolt 77-6 passes through the seventh threaded hole 77-3, the fifth threaded hole 73-3 and the third nut 77-8 in sequence, and the internal threads of the seventh threaded hole 77-3, the fifth threaded hole 73-3 and the third nut 77-8 all mesh with the external thread of the third fastening bolt 77-6; the fourth fastening bolt 77-7 passes through the eighth threaded hole 77-4, the sixth threaded hole 73-4 and the fourth nut 77-9 in sequence. The internal threads of the eighth threaded hole 77-4, the sixth threaded hole 73-4, and the fourth nut 77-9 all engage with the external thread of the fourth fastening bolt 77-7, thus fixing the second clamp half 77 to the outer end of the second fixed arm 73. The third opening 73-1 and the fourth opening 77-1 combine to form a complete circular second front axle hole. Inside the second front axle hole, the third groove 73-5 and the fourth groove 77-5 combine to form a complete circular second bearing mounting groove. The second auxiliary bearing (not shown in the figure) is disposed within the second front axle hole, and the outer ring of the second auxiliary bearing is fixedly disposed within the second bearing mounting groove. The second clamp half 77, the two second ears 77-2, the third opening 73-1, the fourth opening 77-1, the third groove 73-5, the fourth groove 77-5, the third fastening bolt 77-6, the fourth fastening bolt 77-7, the third nut 77-8, and the fourth nut 77-9 constitute the second clamp structure.

[0054] The third fixed arm 74 has a semi-circular fifth opening 74-1 at the middle of its outer end face; two third lugs 74-2 are fixedly provided at the outer end of the third fixed arm 74, which are symmetrically arranged and protrude from the outer end face of the third fixed arm 74 on both sides respectively. The two third lugs 74-2 are respectively provided with a ninth threaded hole 74-3 and a tenth threaded hole 74-4; a semi-circular fifth groove 74-5 is provided in the fifth opening 74-1; the third clamp structure includes a third clamp half 78; the third clamp half 78 is generally arc-shaped, with a semi-circular sixth opening 78-1 in the middle. Two symmetrical third ears 78-2 are fixedly provided at both ends of the third clamp half 78, and the two third ears 78-2 are respectively provided with an eleventh threaded hole 78-3 and a twelfth threaded hole 78-4; a semi-circular sixth groove 78-5 is provided in the sixth opening 78-1. The two third ears 78-2 of the third clamp half 78 respectively fit against the two third lugs 74-2 of the third fixing arm 74, and the fifth opening 74-1 is opposite to the sixth opening 78-1; the fifth fastening bolt 78-6 passes through the eleventh threaded hole 78-3, the ninth threaded hole 74-3 and the fifth nut 78-8 in sequence, and the internal threads of the eleventh threaded hole 78-3, the ninth threaded hole 74-3 and the fifth nut 78-8 all mesh with the external thread of the fifth fastening bolt 78-6; the sixth fastening bolt 78-7 passes through the twelfth threaded hole 78-4, the tenth threaded hole 74-4 and the sixth nut 78-9 in sequence. The internal threads of the twelfth threaded hole 78-4, the tenth threaded hole 74-4, and the sixth nut 78-9 engage with the external thread of the sixth fastening bolt 78-7, thus fixing the third clamp half 78 to the outer end of the third fixed arm 74. The fifth opening 74-1 and the sixth opening 78-1 combine to form a complete circular third front axle hole. Inside the third front axle hole, the fifth groove 74-5 and the sixth groove 78-5 combine to form a complete circular third bearing mounting groove. The third auxiliary bearing (not shown in the figure) is installed inside the third front axle hole, and the outer ring of the third auxiliary bearing is fixedly installed in the third bearing mounting groove. The third clamp half 78, the two third lugs 74-2, the fifth opening 74-1, the sixth opening 78-1, the fifth groove 74-5, the sixth groove 78-5, the fifth fastening bolt 78-6, the sixth fastening bolt 78-7, the fifth nut 78-8, and the sixth nut 78-9 constitute the third clamp structure.

[0055] A fourth main bearing 75 is disposed within the third through hole 71-1 of the first body portion 71. The front end of the first drive shaft 42 passes through the fourth main bearing 75 and the third through hole 71-1 of the first body portion 71, and the front end of the first drive shaft 42 extends out from the front side of the first body portion 71, allowing the first drive shaft 42 and the sun gear 41 to rotate relative to the first fixed assembly 70. In this embodiment, for example, the fourth main bearing 75 includes an inner ring and an outer ring. The inner ring of the fourth main bearing 75 is fixedly connected to the front end of the first drive shaft 42, and the outer ring of the fourth main bearing 75 is fixedly disposed within the third through hole 71-1 of the first body portion 71. The front end of the first gear shaft 13 passes through the first auxiliary bearing and the first front shaft hole, allowing the first gear shaft 13 to drive the first bevel gear 11 and the first planetary gear 12 to rotate relative to the first fixed arm 72. In this embodiment, for example, the first auxiliary bearing includes an inner ring and an outer ring. The inner ring of the first auxiliary bearing is fixedly connected to the front end of the first gear shaft 13, and the outer ring of the first auxiliary bearing is fixedly disposed within the first front shaft hole. The front end of the second gear shaft 23 passes through the second auxiliary bearing and the second front axle hole, enabling the second gear shaft 23 to drive the second bevel gear 21 and the second planetary gear 22 to rotate relative to the second fixed arm 73. In this embodiment, for example, the second auxiliary bearing includes an inner ring and an outer ring. The inner ring of the second auxiliary bearing is fixedly connected to the front end of the second gear shaft 23, and the outer ring of the second auxiliary bearing is fixedly disposed in the second front axle hole. The front end of the third gear shaft 33 passes through the third auxiliary bearing and the third front axle hole, enabling the third gear shaft 33 to drive the third bevel gear 31 and the third planetary gear 32 to rotate relative to the third fixed arm 74. In this embodiment, for example, the third auxiliary bearing includes an inner ring and an outer ring. The inner ring of the third auxiliary bearing is fixedly connected to the front end of the third gear shaft 33, and the outer ring of the third auxiliary bearing is fixedly disposed in the third front axle hole.

[0056] like Figure 5 , Figure 18 and Figure 19 As shown, in a preferred embodiment of this example, the continuously variable transmission based on gear transmission further includes a second fixing component 80; the second fixing component 80 is in a triangular radial shape and includes a second body part 81, a fourth fixing arm 82, a fifth fixing arm 83, a sixth fixing arm 84, a fifth main bearing 85, a fourth clamp structure, a fifth clamp structure, and a sixth clamp structure.

[0057] The second body part 81 is a three-pronged plate structure with a circular fourth through hole 81-1 at its center; the fourth fixing arm 82, the fifth fixing arm 83, and the sixth fixing arm 84 are the same and are all rectangular plate structures; the outer ends (i.e., the ends) of the three prongs of the second body part 81 are fixedly connected to the inner ends of the fourth fixing arm 82, the fifth fixing arm 83, and the sixth fixing arm 84, respectively; the fourth fixing arm 82, the fifth fixing arm 83, and the sixth fixing arm 84 all extend radially outward from the center of the fourth through hole 81-1, and the included angle between any two adjacent fourth fixing arms 82, the fifth fixing arm 83, and the sixth fixing arm 84 is 120°. The fourth clamp structure is fixedly installed at the outer end of the fourth fixing arm 82 (i.e., the end away from the second body part 81), the fifth clamp structure is fixedly installed at the outer end of the fifth fixing arm 83 (i.e., the end away from the second body part 81), and the sixth clamp structure is fixedly installed at the outer end of the sixth fixing arm 84 (i.e., the end away from the second body part 81).

[0058] The back side (i.e., rear) of the second body part 81 arches towards its front side (i.e., front), so that the front side of the second body part 81 has an outwardly arched arc-shaped surface, and its back side has an inwardly concave arc-shaped surface. The front sides of the fourth fixing arm 82, the fifth fixing arm 83, and the sixth fixing arm 84 are all smoothly transitioned and fixedly connected to the front side of the second body part 81; the fixed connection points between the back sides of the fourth fixing arm 82, the fifth fixing arm 83, and the sixth fixing arm 84 and the back side of the second body part 81 all form a second included angle (i.e., the fixed connection points on the back sides form a bend, rather than a smooth transition).

[0059] In a further preferred embodiment of this example, on the back side of the second body portion 81, a fourth reinforcing rib 82-6 is fixedly provided at the connection between the fourth fixing arm 82 and the second body portion 81, a fifth reinforcing rib 83-6 is fixedly provided at the connection between the fifth fixing arm 83 and the second body portion 81, and a sixth reinforcing rib 84-6 is fixedly provided at the connection between the sixth fixing arm 84 and the second body portion 81. The fourth reinforcing rib 82-6, the fifth reinforcing rib 83-6, and the sixth reinforcing rib 84-6 are all used to increase the strength of the connection. In this embodiment, for example, the fourth reinforcing rib 82-6, the fifth reinforcing rib 83-6, and the sixth reinforcing rib 84-6 are all isosceles triangles.

[0060] A semi-circular seventh opening 82-1 is provided at the middle position of the outer end face of the fourth fixed arm 82; two fourth lugs 82-2 are fixedly provided at the outer end of the fourth fixed arm 82. The two fourth lugs 82-2 are symmetrically arranged and protrude from both sides of the outer end face of the fourth fixed arm 82. The two fourth lugs 82-2 are respectively provided with a thirteenth threaded hole 82-3 and a fourteenth threaded hole 82-4; a semi-circular seventh groove 82-5 is provided in the seventh opening 82-1; the fourth clamp structure includes a fourth clamp half 86; the fourth clamp half 86 is generally arc-shaped, with a semi-circular eighth opening 86-1 in the middle; two symmetrical fourth ears 86-2 are fixedly provided at both ends of the fourth clamp half 86, and the two fourth ears 86-2 are respectively provided with a fifteenth threaded hole 86-3 and a sixteenth threaded hole 86-4; a semi-circular eighth groove (not shown in the figure) is provided in the eighth opening 86-1. The two fourth ears 86-2 of the fourth clamp half 86 respectively fit into the two fourth lugs 82-2 of the fourth fixing arm 82, and the seventh opening 82-1 is opposite to the eighth opening 86-1; the seventh fastening bolt 86-5 passes through the fifteenth threaded hole 86-3, the thirteenth threaded hole 82-3 and the seventh nut 86-7 in sequence, and the internal threads of the fifteenth threaded hole 86-3, the thirteenth threaded hole 82-3 and the seventh nut 86-7 are all engaged with the external thread of the seventh fastening bolt 86-5; the eighth fastening bolt 86-6 passes through the sixteenth threaded hole 86-4, the fourteenth threaded hole 82-4 and the eighth nut 86-8 in sequence, and the internal threads of the sixteenth threaded hole 86-4, the fourteenth threaded hole 82-4 and the eighth nut 86-8 are all engaged with the external thread of the eighth fastening bolt 86-6. The threads engage, fixing the fourth clamp half 86 to the outer end of the fourth fixed arm 82. The seventh opening 82-1 and the eighth opening 86-1 are joined together to form a complete circular first rear shaft hole. Inside the first rear shaft hole, the seventh groove 82-5 and the eighth groove (not shown in the figure) are joined together to form a complete annular fourth bearing mounting groove. The fourth auxiliary bearing (not shown in the figure) is set in the first rear shaft hole, and the outer ring of the fourth auxiliary bearing is fixedly set in the fourth bearing mounting groove. The fourth clamp half 86, the two fourth lugs 82-2, the seventh opening 82-1, the eighth opening 86-1, the seventh groove 82-5, the eighth groove, the seventh fastening bolt 86-5, the eighth fastening bolt 86-6, the seventh nut 86-7, and the eighth nut 86-8 constitute the fourth clamp structure.

[0061] A semi-circular ninth opening 83-1 is provided at the middle position of the outer end face of the fifth fixed arm 83; two fifth lugs 83-2 are fixedly provided at the outer end of the fifth fixed arm 83. The two fifth lugs 83-2 are symmetrically arranged and protrude from both sides of the outer end face of the fifth fixed arm 83. The two fifth lugs 83-2 are respectively provided with a seventeenth threaded hole 83-3 and an eighteenth threaded hole 83-4; a semi-circular ninth groove 83-5 is provided in the ninth opening 83-1; the fifth clamp structure includes a fifth clamp half 87; the fifth clamp half 87 is generally arc-shaped, with a semi-circular tenth opening 87-1 in the middle; two symmetrical fifth ears 87-2 are fixedly provided at both ends of the fifth clamp half 87, and the two fifth ears 87-2 are respectively provided with a nineteenth threaded hole 87-3 and a twentieth threaded hole 87-4; a semi-circular tenth groove 87-5 is provided in the tenth opening 87-1. The two fifth ears 87-2 of the fifth clamp half 87 respectively fit into the two fifth lugs 83-2 of the fifth fixing arm 83, and the ninth opening 83-1 is opposite to the tenth opening 87-1; the ninth fastening bolt 87-6 passes through the nineteenth threaded hole 87-3, the seventeenth threaded hole 83-3 and the ninth nut 87-8 in sequence, and the internal threads of the nineteenth threaded hole 87-3, the seventeenth threaded hole 83-3 and the ninth nut 87-8 are all engaged with the external thread of the ninth fastening bolt 87-6; the tenth fastening bolt 87-7 passes through the twentieth threaded hole 87-4, the eighteenth threaded hole 83-4 and the tenth nut 87-9 in sequence, and the internal threads of the twentieth threaded hole 87-4, the eighteenth threaded hole 83-4 and the tenth nut 87-9 are all engaged with the external thread of the tenth fastening bolt 87-7. The meshing of the threads allows the fifth clamp half 87 to be fixedly connected to the outer end of the fifth fixed arm 83. The ninth opening 83-1 and the tenth opening 87-1 are joined together to form a complete circular second rear shaft hole. Inside the second rear shaft hole, the ninth groove 83-5 and the tenth groove 87-5 are joined together to form a complete annular fifth bearing mounting groove. The fifth auxiliary bearing (not shown in the figure) is set in the second rear shaft hole, and the outer ring of the fifth auxiliary bearing is fixedly set in the fifth bearing mounting groove. The fifth clamp half 87, the two fifth lugs 83-2, the ninth opening 83-1, the tenth opening 87-1, the ninth groove 83-5, the tenth groove 87-5, the ninth fastening bolt 87-6, the tenth fastening bolt 87-7, the ninth nut 87-8, and the tenth nut 87-9 constitute the fifth clamp structure.

[0062] The sixth fixed arm 84 has a semi-circular eleventh opening 84-1 at the middle of its outer end face; two sixth lugs 84-2 are fixedly provided at the outer end of the sixth fixed arm 84, which are symmetrically arranged and protrude from the outer end face of the sixth fixed arm 84 on both sides respectively. The two sixth lugs 84-2 are respectively provided with a twenty-first threaded hole 84-3 and a twenty-second threaded hole 84-4; a semi-circular eleventh groove (not shown in the figure) is provided in the eleventh opening 84-1; the sixth clamp structure includes a sixth clamp half 88; the sixth clamp half 88 is generally arc-shaped, with a semi-circular twelfth opening 88-1 in the middle; two symmetrical sixth ears 88-2 are fixedly provided at both ends of the sixth clamp half 88, and the two sixth ears 88-2 are respectively provided with a twenty-third threaded hole 88-3 and a twenty-fourth threaded hole 88-4; a semi-circular twelfth groove 88-5 is provided in the twelfth opening 88-1. The two sixth ears 88-2 of the sixth clamp half 88 respectively fit against the two sixth lugs 84-2 of the sixth fixing arm 84, and the eleventh opening 84-1 is opposite to the twelfth opening 88-1; the eleventh fastening bolt 88-6 passes through the twenty-third threaded hole 88-3, the twenty-first threaded hole 84-3 and the eleventh nut 88-8 in sequence, and the internal threads of the twenty-third threaded hole 88-3, the twenty-first threaded hole 84-3 and the eleventh nut 88-8 are all engaged with the external thread of the eleventh fastening bolt 88-6; the twelfth fastening bolt 88-7 passes through the twenty-fourth threaded hole 88-4, the twenty-second threaded hole 84-4 and the twelfth nut 88-9 in sequence, and the internal threads of the twenty-fourth threaded hole 88-4, the twenty-second threaded hole 84-4 and the twelfth nut 88-9 are all engaged with the twelfth fastening bolt 88-7. The external threads engage, so that the sixth clamp half 88 is fixedly connected to the outer end of the sixth fixed arm 84, and the eleventh opening 84-1 and the twelfth opening 88-1 are assembled to form a complete circular third rear shaft hole. Inside the third rear shaft hole, the eleventh groove (not shown in the figure) and the twelfth groove 88-5 are assembled to form a complete annular sixth bearing mounting groove. The sixth auxiliary bearing (not shown in the figure) is set in the third rear shaft hole, and the outer ring of the sixth auxiliary bearing is fixedly set in the sixth bearing mounting groove. The sixth clamp half 88, the two sixth ears 88-2, the eleventh opening 84-1, the twelfth opening 88-1, the eleventh groove, the twelfth groove 88-5, the eleventh fastening bolt 88-6, the twelfth fastening bolt 88-7, the eleventh nut 88-8, and the twelfth nut 88-9 constitute the sixth clamp structure.

[0063] A fifth main bearing 85 is disposed within the fourth through hole 81-1 of the second body portion 81. The rear end of the second drive shaft 51 passes through the fifth main bearing 85 and the fourth through hole 81-1 of the second body portion 81, and the rear end of the second drive shaft 51 extends out from the rear side of the second body portion 81, allowing the second drive shaft 51 and the drive gear 52 to rotate relative to the second fixed assembly 80. In this embodiment, for example, the fifth main bearing 85 includes an inner ring and an outer ring. The inner ring of the fifth main bearing 85 is fixedly connected to the rear end of the second drive shaft 51, and the outer ring of the fifth main bearing 85 is fixedly disposed within the fourth through hole 81-1 of the second body portion 81. The rear end of the first gear shaft 13 passes through the fourth auxiliary bearing and the first rear shaft hole, allowing the first gear shaft 13 to drive the first bevel gear 11 to rotate relative to the fourth fixed arm 82. In this embodiment, for example, the fourth auxiliary bearing includes an inner ring and an outer ring. The inner ring of the fourth auxiliary bearing is fixedly connected to the rear end of the first gear shaft 13, and the outer ring of the fourth auxiliary bearing is fixedly disposed within the first rear shaft hole. The rear end of the second gear shaft 23 passes through the fifth auxiliary bearing and the second rear axle hole, enabling the second gear shaft 23 to drive the second bevel gear 21 to rotate relative to the fifth fixed arm 83. In this embodiment, for example, the fifth auxiliary bearing includes an inner ring and an outer ring. The inner ring of the fifth auxiliary bearing is fixedly connected to the rear end of the second gear shaft 23, and the outer ring of the fifth auxiliary bearing is fixedly disposed in the second rear axle hole. The rear end of the third gear shaft 33 passes through the sixth auxiliary bearing and the third rear axle hole, enabling the third gear shaft 33 to drive the third bevel gear 31 to rotate relative to the sixth fixed arm 84. In this embodiment, for example, the sixth auxiliary bearing includes an inner ring and an outer ring. The inner ring of the sixth auxiliary bearing is fixedly connected to the rear end of the third gear shaft 33, and the outer ring of the sixth auxiliary bearing is fixedly disposed in the third rear axle hole.

[0064] like Figure 20 and Figure 21As shown, the continuously variable transmission (CVT) further includes a housing assembly 90, which comprises a front half-shell 91, a rear half-shell 92, and a base 93. The front half-shell 91 and the rear half-shell 92 are interlocked to form a hollow, complete housing, and are fixedly connected, for example, by nuts and bolts located at the edges. The first bevel gear assembly 10, the second bevel gear assembly 20, the third bevel gear assembly 30, the first transmission assembly 40, the second transmission assembly 50, the lower part of the adjusting fork assembly 60, the first fixing assembly 70, and the second fixing assembly 80 are all disposed within the internal cavity of the housing. A rectangular window 94 is provided on the upper surface of the rear half-shell 92, and the adjusting fork assembly 60 is disposed within the window 94, with its upper end extending upward through the window 94, and its handle 67 located above the upper surface of the rear half-shell 92. The first drive shaft 42 passes through the front half-shell 91 and extends forward; the second drive shaft 51 passes through the rear half-shell 92 and extends backward. The upper end of the base 93 is fixedly connected to the bottom of the rear half-shell 92, and the base 93 is used to fix the continuously variable transmission relative to the ground.

[0065] The basic working principle of the continuously variable transmission is as follows:

[0066] In use, the rear end of the second drive shaft 51 is the power input end of the continuously variable transmission (CVT). An external force (such as a car engine) drives the second drive shaft 51 to rotate; the second drive shaft 51 then drives the drive gear 52 to rotate; the drive gear 52 then drives the first bevel gear 11, the second bevel gear 21, and the third bevel gear 31 to rotate; the first bevel gear 11 then drives the first planetary gear 12 to rotate, the second bevel gear 21 then drives the second planetary gear 22 to rotate, and the third bevel gear 31 then drives the third planetary gear 32 to rotate; the first planetary gear 12, the second planetary gear 22, and the third bevel gear 31 then drive the sun gear 41 to rotate; the sun gear 41 then drives the first drive shaft 42 to rotate; the first drive shaft 42 is the power output shaft of the CVT and outputs power outward; the transmission ratio of the CVT is adjusted by adjusting the front and rear position of the drive gear 52 along the second drive shaft 51. The user can adjust the position of the drive gear 52 along the second transmission shaft 51 by adjusting the handle 67 of the shift fork assembly 60, thereby adjusting the transmission ratio of the continuously variable transmission.

Claims

1. A continuously variable transmission (CVT) based on gear transmission, characterized in that, The continuously variable transmission includes a first bevel gear assembly (10), a second bevel gear assembly (20), a third bevel gear assembly (30), a first transmission assembly (40), and a second transmission assembly (50); the first bevel gear assembly (10), the second bevel gear assembly (20), and the third bevel gear assembly (30) are identical; The first bevel gear assembly (10) includes a first bevel gear (11), a first planetary gear (12), and a first gear shaft (13); the second bevel gear assembly (20) includes a second bevel gear (21), a second planetary gear (22), and a second gear shaft (23); the third bevel gear assembly (30) includes a third bevel gear (31), a third planetary gear (32), and a third gear shaft (33); the first bevel gear (11), the second bevel gear (21), and the third bevel gear (31) are identical; the first planetary gear (12), the second planetary gear (22), and the third planetary gear (32) are identical; The first bevel gear (11), the second bevel gear (21) and the third bevel gear (31) are all truncated cones, and the large ends of all three are facing forward; The first planetary gear (12) is disposed at the front end of the first bevel gear (11); the first gear shaft (13) is fixedly disposed on the central axis of the first bevel gear (11) and extends from its front and rear ends; the first planetary gear (12) is fixedly sleeved on the front end of the first gear shaft (13), and the first gear shaft (13) extends from the front side of the first planetary gear (12); both the first planetary gear (12) and the first bevel gear (11) are pivoted around the first gear shaft (13); the first helical tooth portion (14) is fixedly disposed on the surface of the first bevel gear (11), and the area of ​​the surface of the first bevel gear (11) other than the first helical tooth portion (14) is a smooth surface without teeth; the first helical tooth portion (14) includes several teeth; The second planetary gear (22) is disposed at the front end of the second bevel gear (21); the second gear shaft (23) is fixedly disposed on the central axis of the second bevel gear (21) and extends from its front and rear ends; the second planetary gear (22) is fixedly sleeved on the front end of the second gear shaft (23), and the second gear shaft (23) extends from the front side of the second planetary gear (22); The second planetary gear (22) and the second bevel gear (21) both have the second gear shaft (23) as their axis of rotation; the second helical tooth (24) is fixedly disposed on the surface of the second bevel gear (21), and the area of ​​the surface of the second bevel gear (21) other than the second helical tooth (24) is a smooth surface without teeth; the second helical tooth (24) includes several teeth; The third planetary gear (32) is disposed at the front end of the third bevel gear (31); the third gear shaft (33) is fixedly disposed on the central axis of the third bevel gear (31) and extends from its front and rear ends; the third planetary gear (32) is fixedly sleeved on the front end of the third gear shaft (33), and the third gear shaft (33) extends from the front side of the third planetary gear (32); Both the third planetary gear (32) and the third bevel gear (31) are pivoted on the third gear shaft (33); the third helical tooth (34) is fixedly disposed on the surface of the third bevel gear (31), and the area of ​​the surface of the third bevel gear (31) other than the third helical tooth (34) is a smooth surface without teeth; the third helical tooth (34) includes several teeth; The first transmission assembly (40) includes a sun gear (41), a first transmission shaft (42), and a first main bearing (43); the sun gear (41) is generally in the shape of a disc; the rear end of the first transmission shaft (42) is fixedly connected to the center of the front side of the sun gear (41); a blind hole (44) is provided at the center of the rear side of the sun gear (41); the first main bearing (43) is provided in the blind hole (44); the first planetary gear (12), the second planetary gear (22), and the third planetary gear (32) all mesh with the sun gear (41); The second transmission assembly (50) includes a second transmission shaft (51) and a drive gear (52); the drive gear (52) is generally in the shape of a disc; two guide ridges (51-1) are fixedly provided on the outer surface of the second transmission shaft (51), and the two guide ridges (51-1) are symmetrically distributed; a cylindrical bushing (52-1) is fixedly provided at the center of the drive gear (52), the bushing (52-1) extends along the central axis of the drive gear (52), and the bushing (52-1) extends from both sides of the drive gear (52); the bushing (52-1) is coaxial with the drive gear (52); a main shaft hole (52-2) is provided at the center of the bushing (52-1), and two U-shaped guide grooves (52-3) are provided in the main shaft hole (52-2), and the two guide grooves (52-3) are symmetrically arranged; a number of evenly distributed gear teeth (52-4) are fixedly provided on the outer circumference of the drive gear (52); The second drive shaft (51) passes into the main shaft hole (52-2) of the bushing (52-1), and the two guide protrusions (51-1) of the second drive shaft (51) are respectively embedded in the two guide grooves (52-3) of the main shaft hole (52-2), so that the drive gear (52) can slide along the second drive shaft (51) with the help of its bushing (52-1), and the second drive shaft (51) can drive the drive gear (52) to rotate via the bushing (52-1); the first main bearing (43) is sleeved on the front end of the second drive shaft (51), so that the second drive shaft (51) can rotate relative to the sun gear (41); The teeth (52-4) of the drive gear (52) can mesh with the first helical tooth portion (14), the second helical tooth portion (24), and the third helical tooth portion (34); The rear end of the second drive shaft (51) is the power input end of the continuously variable transmission (CVT). External force drives the second drive shaft (51) to rotate. The second drive shaft (51) then drives the drive gear (52) to rotate. The drive gear (52) then drives the first bevel gear (11), the second bevel gear (21), and the third bevel gear (31) to rotate. The first bevel gear (11) then drives the first planetary gear (12) to rotate. The second bevel gear (21) then drives the second planetary gear (22) to rotate. The third bevel gear (31) then drives the third planetary gear (32) to rotate. The first planetary gear (12), the second planetary gear (22), and the third bevel gear (31) then drive the sun gear (41) to rotate. The sun gear (41) then drives the first drive shaft (42) to rotate. The first drive shaft (42) is a power output shaft and can output power outward. The transmission ratio is adjusted by adjusting the position of the drive gear (52) along the front and rear of the second drive shaft (51).

2. The continuously variable transmission based on gear transmission according to claim 1, characterized in that, The continuously variable transmission (CVT) further includes an adjusting fork assembly (60), which includes a front wing plate (61), a rear wing plate (62), a second main bearing (63), and a third main bearing (64). The lower parts of the front wing plate (61) and the rear wing plate (62) are both annular, and the lower part of the front wing plate (61) is provided with a first through hole (65), and the lower part of the rear wing plate (62) is provided with a second through hole (66). A handle (67) is fixedly provided at the upper end of the front wing plate (61). The front wing plate (61) is located on... The front side of the drive gear (52) and the rear wing plate (62) are located on the rear side of the drive gear (52); the front wing plate (61) and the rear wing plate (62) are fastened together and fixedly connected; the second main bearing (63) is located in the first through hole (65) of the front wing plate (61) and is sleeved on the front end of the bushing (52-1); the third main bearing (64) is located in the second through hole (66) of the rear wing plate (62) and is sleeved on the rear end of the bushing (52-1); The second drive shaft (51) passes through the center hole of the second main bearing (63), the main shaft hole (52-2) of the bushing (52-1) of the drive gear (52), and the center hole of the third main bearing (64). The two guide protrusions (51-1) of the second drive shaft (51) are respectively embedded in the two guide grooves (52-3) of the main shaft hole (52-2), so that the drive gear (52) can slide along the second drive shaft (51) by means of its bushing (52-1), and the second drive shaft (51) can drive the drive gear (52) to rotate relative to the adjusting fork assembly (60) via the bushing (52-1). The first main bearing (43) is located on the front side of the front wing plate (61). The user drives the drive gear (52) to move back and forth along the second drive shaft (51) by adjusting the handle (67) of the adjusting fork assembly (60), thereby adjusting the back and forth position of the drive gear (52) along the second drive shaft (51) and thus adjusting the transmission ratio.

3. The continuously variable transmission based on gear transmission according to claim 1, characterized in that, Along the circumferential direction of the front end of the first bevel gear (11), the tooth width of the first helical tooth (14) gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the first helical tooth (14) and the axial direction of the first bevel gear (11) gradually decreases to zero and then gradually increases from zero, wherein the tooth with a helix angle of zero is a straight tooth and the remaining teeth are helical teeth; Along the circumferential direction of the front end of the second bevel gear (21), the tooth width of the second helical tooth (24) gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the second helical tooth (24) and the axial direction of the second bevel gear (21) gradually decreases to zero and then gradually increases from zero, wherein the tooth with a helix angle of zero is a straight tooth and the remaining teeth are helical teeth; Along the circumferential direction of the front end of the third bevel gear (31), the tooth width of the third helical tooth (34) gradually increases and then gradually decreases; the helix angle formed by the tooth direction of the third helical tooth (34) and the axial direction of the third bevel gear (31) gradually decreases to zero and then gradually increases from zero. Among them, the tooth with a helix angle of zero is a straight tooth, and the remaining teeth are helical teeth.

4. The continuously variable transmission based on gear transmission according to claim 1, characterized in that, Along the axial direction of the drive gear (52), the teeth (52-4) of the drive gear (52) are thin on both sides and thick in the middle and are symmetrical on both sides; the cross section of the teeth (52-4) of the drive gear (52) is rhomboid or circular.

5. The continuously variable transmission based on gear transmission according to claim 2, characterized in that, The continuously variable transmission further includes a housing assembly (90), which includes a front half-shell (91), a rear half-shell (92), and a base (93); the front half-shell (91) and the rear half-shell (92) are fastened together to form a complete hollow housing, and the front half-shell (91) and the rear half-shell (92) are fixedly connected; the lower parts of the first bevel gear assembly (10), the second bevel gear assembly (20), the third bevel gear assembly (30), the first transmission assembly (40), the second transmission assembly (50), and the adjusting fork assembly (60) are all disposed in the internal cavity of the housing; A rectangular window (94) is provided on the upper surface of the rear half-shell (92). An adjustment fork assembly (60) is disposed in the window (94), and the upper end of the adjustment fork assembly (60) extends upward through the window (94). Its handle (67) is located above the upper surface of the rear half-shell (92). A first drive shaft (42) passes through the front half-shell (91) and extends forward. A second drive shaft (51) passes through the rear half-shell (92) and extends backward. The upper end of the base (93) is fixedly connected to the bottom of the rear half-shell (92). The base (93) is used to fix the continuously variable transmission relative to the ground.

6. The continuously variable transmission based on gear transmission according to any one of claims 1 to 5, characterized in that, The continuously variable transmission further includes a first fixing component (70), which is in the shape of a three-pronged radial branch. The first fixing component (70) includes a first body part (71), a first fixing arm (72), a second fixing arm (73), a third fixing arm (74), and a fourth main bearing (75). The first body part (71) is a three-pronged plate structure with a circular third through hole (71-1) at its center; the first fixing arm (72), the second fixing arm (73), and the third fixing arm (74) are the same and are all rectangular plate structures; the outer ends of the three prongs of the first body part (71) are fixedly connected to the inner ends of the first fixing arm (72), the second fixing arm (73), and the third fixing arm (74); the first fixing arm (72), the second fixing arm (73), and the third fixing arm (74) all extend radially outward with the center of the third through hole (71-1) as the center, and the included angle between any two adjacent first fixing arms (72), second fixing arms (73), and third fixing arms (74) is 120°; The fourth main bearing (75) is disposed in the third through hole (71-1) of the first body part (71), the front end of the first drive shaft (42) passes through the fourth main bearing (75) and the third through hole (71-1) of the first body part (71), and the front end of the first drive shaft (42) extends out from the front side of the first body part (71), so that the first drive shaft (42) and the sun gear (41) can rotate relative to the first fixed assembly (70); The front end of the first gear shaft (13) is located at the outer end of the first fixed arm (72), and the first gear shaft (13) can drive the first bevel gear (11) and the first planetary gear (12) to rotate relative to the first fixed arm (72); The front end of the second gear shaft (23) is located at the outer end of the second fixed arm (73), and the second gear shaft (23) can drive the second bevel gear (21) and the second planetary gear (22) to rotate relative to the second fixed arm (73); the front end of the third gear shaft (33) is located at the outer end of the third fixed arm (74), and the third gear shaft (33) can drive the third bevel gear (31) and the third planetary gear (32) to rotate relative to the third fixed arm (74).

7. The continuously variable transmission based on gear transmission according to claim 6, characterized in that, The first fixing component (70) also includes a first clamp structure, a second clamp structure, and a third clamp structure; the first clamp structure is fixedly disposed at the outer end of the first fixing arm (72), the second clamp structure is fixedly disposed at the outer end of the second fixing arm (73), and the third clamp structure is fixedly disposed at the outer end of the third fixing arm (74); A semi-circular first opening (72-1) is provided at the middle position of the outer end face of the first fixed arm (72); two first lugs (72-2) are fixedly provided at the outer end of the first fixed arm (72), the two first lugs (72-2) are symmetrically arranged and protrude from both sides of the outer end face of the first fixed arm (72), and a first threaded hole (72-3) and a second threaded hole (72-4) are respectively provided on the two first lugs (72-2); a semi-circular first groove (72-5) is provided in the first opening (72-1); the first clamp structure includes a first clamp half (76); the first clamp half (76) is generally arc-shaped, and a semi-circular second opening (72-5) is provided in the middle of it. 6-1); Two symmetrical first ears (76-2) are fixedly provided at both ends of the first clamp half (76), and the two first ears (76-2) are respectively provided with a third threaded hole (76-3) and a fourth threaded hole (76-4); a semi-circular second groove is provided in the second opening (76-1); the two first ears (76-2) of the first clamp half (76) are respectively fitted with the two first lugs (72-2) of the first fixing arm (72), and the first opening (72-1) is opposite to the second opening (76-1); the first fastening bolt (76-5) passes through the third threaded hole (76-3), the first threaded hole (72-3) and the first... The internal threads of the nut (76-7), the third threaded hole (76-3), the first threaded hole (72-3), and the first nut (76-7) all engage with the external thread of the first fastening bolt (76-5). The second fastening bolt (76-6) passes sequentially through the fourth threaded hole (76-4), the second threaded hole (72-4), and the second nut (76-8). The internal threads of the fourth threaded hole (76-4), the second threaded hole (72-4), and the second nut (76-8) all engage with the external thread of the second fastening bolt (76-6), thus fixing the first clamp half (76) to the outer end of the first fixing arm (72). Furthermore, the first opening (72-1) and the... The two openings (76-1) are joined together to form a complete circular first front axle hole. The first front axle hole is formed by the first groove (72-5) and the second groove, which are joined together to form a complete annular first bearing mounting groove. The first auxiliary bearing is set in the first front axle hole, and the outer ring of the first auxiliary bearing is fixedly set in the first bearing mounting groove. The first clamp half (76), two first lugs (72-2), the first opening (72-1), the second opening (76-1), the first groove (72-5), the second groove, the first fastening bolt (76-5), the second fastening bolt (76-6), the first nut (76-7), and the second nut (76-8) constitute the first clamp structure. The second fixed arm (73) has a semi-circular third opening (73-1) at the middle of its outer end face; the second fixed arm (73) has two second lugs (73-2) fixedly installed at its outer end. The two second lugs (73-2) are symmetrically arranged and protrude from the outer end face of the second fixed arm (73) to both sides. The two second lugs (73-2) are respectively provided with a fifth threaded hole (73-3) and a sixth threaded hole (73-4); a semi-circular third groove (73-5) is provided in the third opening (73-1); the second clamp structure includes a second clamp half (77); the second clamp half (77) is generally arc-shaped, and a semi-circular fourth opening (77-1) is provided in the middle of it. The second clamp half (77) has two symmetrical second ears (77-2) fixed at both ends, and the two second ears (77-2) are respectively provided with a seventh threaded hole (77-3) and an eighth threaded hole (77-4); a semi-circular fourth groove (77-5) is provided in the fourth opening (77-1); the two second ears (77-2) of the second clamp half (77) are respectively fitted with the two second protrusions (73-2) of the second fixing arm (73), and the third opening (73-1) is opposite to the fourth opening (77-1); the third fastening bolt (77-6) passes through the seventh threaded hole (77-3), the fifth threaded hole (73-3) and the third nut in sequence. (77-8), the internal threads of the seventh threaded hole (77-3), the fifth threaded hole (73-3), and the third nut (77-8) all engage with the external thread of the third fastening bolt (77-6). The fourth fastening bolt (77-7) passes through the eighth threaded hole (77-4), the sixth threaded hole (73-4), and the fourth nut (77-9) in sequence. The internal threads of the eighth threaded hole (77-4), the sixth threaded hole (73-4), and the fourth nut (77-9) all engage with the external thread of the fourth fastening bolt (77-7), so that the second clamp half (77) is fixedly connected to the outer end of the second fixing arm (73), and the third opening (73-1) and the fourth opening (77-8) are also connected. -1) The second front axle hole is assembled to form a complete circle. The second front axle hole is assembled with the third groove (73-5) and the fourth groove (77-5) to form a complete circle second bearing mounting groove. The second auxiliary bearing is set in the second front axle hole, and the outer ring of the second auxiliary bearing is fixedly set in the second bearing mounting groove. The second clamp half (77), the two second ears (77-2), the third opening (73-1), the fourth opening (77-1), the third groove (73-5), the fourth groove (77-5), the third fastening bolt (77-6), the fourth fastening bolt (77-7), the third nut (77-8), and the fourth nut (77-9) constitute the second clamp structure. The third fixed arm (74) has a semi-circular fifth opening (74-1) at the middle of its outer end face; the third fixed arm (74) has two third lugs (74-2) fixedly installed at its outer end. The two third lugs (74-2) are symmetrically arranged and protrude from the outer end face of the third fixed arm (74) to both sides. The two third lugs (74-2) are respectively provided with a ninth threaded hole (74-3) and a tenth threaded hole (74-4); a semi-circular fifth groove (74-5) is provided in the fifth opening (74-1); the third clamp structure includes a third clamp half (78); the third clamp half (78) is generally arc-shaped, and a semi-circular sixth opening (78-1) is provided in the middle of it. The third clamp half (78) has two symmetrical third ears (78-2) fixed at both ends, and the two third ears (78-2) are respectively provided with an eleventh threaded hole (78-3) and a twelfth threaded hole (78-4); a semi-circular sixth groove (78-5) is provided in the sixth opening (78-1); the two third ears (78-2) of the third clamp half (78) are respectively fitted with the two third protrusions (74-2) of the third fixing arm (74), and the fifth opening (74-1) is opposite to the sixth opening (78-1); the fifth fastening bolt (78-6) passes through the eleventh threaded hole (78-3), the ninth threaded hole (74-3) and the fifth threaded hole in sequence. The internal threads of the 11th threaded hole (78-3), the 9th threaded hole (74-3), and the 5th nut (78-8) all engage with the external thread of the 5th fastening bolt (78-6). The 6th fastening bolt (78-7) passes sequentially through the 12th threaded hole (78-4), the 10th threaded hole (74-4), and the 6th nut (78-9). The internal threads of the 12th threaded hole (78-4), the 10th threaded hole (74-4), and the 6th nut (78-9) engage with the external thread of the 6th fastening bolt (78-7), thus fixing the 3rd clamp half (78) to the outer end of the 3rd fixed arm (74). Furthermore, the 5th opening (74-1) and the 6th opening (78-8)... -1) The third front axle hole is assembled to form a complete circle. The third front axle hole is assembled with the fifth groove (74-5) and the sixth groove (78-5) to form a complete circle third bearing mounting groove. The third auxiliary bearing is set in the third front axle hole, and the outer ring of the third auxiliary bearing is fixedly set in the third bearing mounting groove. The third clamp half (78), two third lugs (74-2), the fifth opening (74-1), the sixth opening (78-1), the fifth groove (74-5), the sixth groove (78-5), the fifth fastening bolt (78-6), the sixth fastening bolt (78-7), the fifth nut (78-8), and the sixth nut (78-9) constitute the third clamp structure. The front end of the first gear shaft (13) passes through the first auxiliary bearing and the first front shaft hole, so that the first gear shaft (13) can drive the first bevel gear (11) and the first planetary gear (12) to rotate relative to the first fixed arm (72); The front end of the second gear shaft (23) passes through the second auxiliary bearing and the second front shaft hole, so that the second gear shaft (23) can drive the second bevel gear (21) and the second planetary gear (22) to rotate relative to the second fixed arm (73); the front end of the third gear shaft (33) passes through the third auxiliary bearing and the third front shaft hole, so that the third gear shaft (33) can drive the third bevel gear (31) and the third planetary gear (32) to rotate relative to the third fixed arm (74).

8. The continuously variable transmission based on gear transmission according to claim 6, characterized in that, The back of the first body part (71) of the first fixing component (70) arches towards its front, so that the front of the first body part (71) is an outwardly arched arc surface and its back is an inwardly concave arc surface; the front of the first fixing arm (72), the second fixing arm (73) and the third fixing arm (74) are all smoothly connected to the front of the first body part (71); the back of the first fixing arm (72), the second fixing arm (73) and the third fixing arm (74) are all fixedly connected to the back of the first body part (71) at the fixed connection points, forming a first included angle.

9. The continuously variable transmission based on gear transmission according to any one of claims 1 to 5, characterized in that, The continuously variable transmission further includes a second fixing component (80); the second fixing component (80) is triangularly radial and includes a second body part (81), a fourth fixing arm (82), a fifth fixing arm (83), a sixth fixing arm (84), and a fifth main bearing (85); The second body part (81) is a three-pronged plate structure with a circular fourth through hole (81-1) at its center; the fourth fixing arm (82), the fifth fixing arm (83), and the sixth fixing arm (84) are the same and are all rectangular plate structures; the outer ends of the three prongs of the second body part (81) are fixedly connected to the inner ends of the fourth fixing arm (82), the fifth fixing arm (83), and the sixth fixing arm (84); the fourth fixing arm (82), the fifth fixing arm (83), and the sixth fixing arm (84) all extend radially outward from the center of the fourth through hole (81-1), and the included angle between any two adjacent fourth fixing arms (82), the fifth fixing arm (83), and the sixth fixing arm (84) is 120°; The fifth main bearing (85) is disposed in the fourth through hole (81-1) of the second body part (81). The rear end of the second drive shaft (51) passes through the fifth main bearing (85) and the fourth through hole (81-1) of the second body part (81), and the rear end of the second drive shaft (51) protrudes from the rear side of the second body part (81), so that the second drive shaft (51) and the drive gear (52) can rotate relative to the second fixed assembly (80); the rear end of the first gear shaft (13) is disposed at the outer end of the fourth fixed arm (82). Furthermore, the first gear shaft (13) can drive the first bevel gear (11) to rotate relative to the fourth fixed arm (82); the rear end of the second gear shaft (23) is located at the outer end of the fifth fixed arm (83), and the second gear shaft (23) can drive the second bevel gear (21) to rotate relative to the fifth fixed arm (83); the rear end of the third gear shaft (33) is located at the outer end of the sixth fixed arm (84), and the third gear shaft (33) can drive the third bevel gear (31) to rotate relative to the sixth fixed arm (84).

10. The continuously variable transmission based on gear transmission according to claim 9, characterized in that, The second fixing component (80) also includes a fourth clamp structure, a fifth clamp structure, and a sixth clamp structure; the fourth clamp structure is fixedly disposed at the outer end of the fourth fixing arm (82), the fifth clamp structure is fixedly disposed at the outer end of the fifth fixing arm (83), and the sixth clamp structure is fixedly disposed at the outer end of the sixth fixing arm (84). The fourth fixed arm (82) has a semi-circular seventh opening (82-1) at the middle of its outer end face; the fourth fixed arm (82) has two fourth lugs (82-2) fixedly installed at its outer end, which are symmetrically arranged and protrude from the outer end face of the fourth fixed arm (82) to both sides respectively, and the two fourth lugs (82-2) are respectively provided with a thirteenth threaded hole (82-3) and a fourteenth threaded hole (82-4); a semi-circular seventh groove (82-5) is provided in the seventh opening (82-1); the fourth clamp structure includes a fourth clamp half (86); the fourth clamp half (86) is generally arc-shaped, and a semi-circular eighth opening (86-1) is provided in the middle of it. -1); The two ends of the fourth clamp half (86) are fixedly provided with two symmetrical fourth ears (86-2), and the two fourth ears (86-2) are respectively provided with the fifteenth threaded hole (86-3) and the sixteenth threaded hole (86-4); The eighth opening (86-1) is provided with a semi-circular eighth groove; The two fourth ears (86-2) of the fourth clamp half (86) are respectively fitted with the two fourth lugs (82-2) of the fourth fixing arm (82), and the seventh opening (82-1) is opposite to the eighth opening (86-1); The seventh fastening bolt (86-5) passes through the fifteenth threaded hole (86-3), the thirteenth threaded hole (82-3) and the seventh threaded hole in sequence. The internal threads of the nut (86-7), the fifteenth threaded hole (86-3), the thirteenth threaded hole (82-3), and the seventh nut (86-7) all engage with the external thread of the seventh fastening bolt (86-5). The eighth fastening bolt (86-6) passes sequentially through the sixteenth threaded hole (86-4), the fourteenth threaded hole (82-4), and the eighth nut (86-8). The internal threads of the sixteenth threaded hole (86-4), the fourteenth threaded hole (82-4), and the eighth nut (86-8) all engage with the external thread of the eighth fastening bolt (86-6), thus fixing the fourth clamp half (86) to the outer end of the fourth fixed arm (82), and the seventh opening (82-1) The first rear axle hole is formed by combining the seventh groove (82-5) and the eighth groove (86-1). The first rear axle hole is formed by combining the seventh groove (82-5) and the eighth groove to form a complete annular fourth bearing mounting groove. The fourth auxiliary bearing is set in the first rear axle hole, and the outer ring of the fourth auxiliary bearing is fixedly set in the fourth bearing mounting groove. The fourth clamp half (86), two fourth lugs (82-2), the seventh opening (82-1), the eighth opening (86-1), the seventh groove (82-5), the eighth groove, the seventh fastening bolt (86-5), the eighth fastening bolt (86-6), the seventh nut (86-7), and the eighth nut (86-8) constitute the fourth clamp structure. The fifth fixed arm (83) has a semi-circular ninth opening (83-1) at the middle of its outer end face; the fifth fixed arm (83) has two fifth lugs (83-2) fixedly installed at its outer end. The two fifth lugs (83-2) are symmetrically arranged and protrude from the outer end face of the fifth fixed arm (83) to both sides. The two fifth lugs (83-2) are respectively provided with a seventeenth threaded hole (83-3) and an eighteenth threaded hole (83-4); a semi-circular ninth groove (83-5) is provided in the ninth opening (83-1); the fifth clamp structure includes a fifth clamp half (87); the fifth clamp half (87) is generally arc-shaped, and a semi-circular tenth opening (87-1) is provided in the middle of it; The fifth clamp half (87) has two symmetrical fifth ears (87-2) fixed at both ends, and the two fifth ears (87-2) are respectively provided with a nineteenth threaded hole (87-3) and a twentieth threaded hole (87-4); a semi-circular tenth groove (87-5) is provided in the tenth opening (87-1); the two fifth ears (87-2) of the fifth clamp half (87) are respectively fitted with the two fifth lugs (83-2) of the fifth fixing arm (83), and the ninth opening (83-1) is opposite to the tenth opening (87-1); the ninth fastening bolt (87-6) passes through the nineteenth threaded hole (87-3), the seventeenth threaded hole (83-3) and the ninth nut in sequence. 87-8), the internal threads of the nineteenth threaded hole (87-3), the seventeenth threaded hole (83-3), and the ninth nut (87-8) all engage with the external thread of the ninth fastening bolt (87-6). The tenth fastening bolt (87-7) passes through the twentieth threaded hole (87-4), the eighteenth threaded hole (83-4), and the tenth nut (87-9) in sequence. The internal threads of the twentieth threaded hole (87-4), the eighteenth threaded hole (83-4), and the tenth nut (87-9) all engage with the external thread of the tenth fastening bolt (87-7), so that the fifth clamp half (87) is fixedly connected to the outer end of the fifth fixing arm (83), and the ninth opening (83-1) and the tenth opening (87-8) are also connected. 7-1) The second rear axle hole is assembled to form a complete circular second rear axle hole. The second rear axle hole is assembled by the ninth groove (83-5) and the tenth groove (87-5) to form a complete circular fifth bearing mounting groove. The fifth auxiliary bearing is set in the second rear axle hole, and the outer ring of the fifth auxiliary bearing is fixedly set in the fifth bearing mounting groove. The fifth clamp half (87), two fifth lugs (83-2), the ninth opening (83-1), the tenth opening (87-1), the ninth groove (83-5), the tenth groove (87-5), the ninth fastening bolt (87-6), the tenth fastening bolt (87-7), the ninth nut (87-8), and the tenth nut (87-9) constitute the fifth clamp structure. The sixth fixed arm (84) has a semi-circular eleventh opening (84-1) at the middle of its outer end face; the sixth fixed arm (84) has two sixth lugs (84-2) fixedly installed at its outer end, which are symmetrically arranged and protrude from the outer end face of the sixth fixed arm (84) to both sides respectively, and the two sixth lugs (84-2) are respectively provided with a twenty-first threaded hole (84-3) and a twenty-second threaded hole (84-4); a semi-circular eleventh groove is provided in the eleventh opening (84-1); the sixth clamp structure includes a sixth clamp half (88); the sixth clamp half (88) is generally arc-shaped, with a semi-circular twelfth opening (88-1) in the middle; the sixth clamp half (88) has two symmetrical sixth ears (88-2) fixed at both ends, and the two sixth ears (88-2) are respectively provided with a twenty-third threaded hole (88-3) and a twenty-fourth threaded hole (88-4); a semi-circular twelfth groove (88-5) is provided in the twelfth opening (88-1); the two sixth ears (88-2) of the sixth clamp half (88) are respectively fitted with the two sixth lugs (84-2) of the sixth fixing arm (84), and the eleventh opening (84-1) is opposite to the twelfth opening (88-1); the eleventh fastening bolt (88-6) passes through the twenty-third threaded hole (88-3), the twenty-first threaded hole (84-3) and the eleventh nut (88-4) in sequence. 8-8), the internal threads of the twenty-third threaded hole (88-3), the twenty-first threaded hole (84-3), and the eleventh nut (88-8) all engage with the external thread of the eleventh fastening bolt (88-6). The twelfth fastening bolt (88-7) passes sequentially through the twenty-fourth threaded hole (88-4), the twenty-second threaded hole (84-4), and the twelfth nut (88-9). The internal threads of the twenty-fourth threaded hole (88-4), the twenty-second threaded hole (84-4), and the twelfth nut (88-9) all engage with the external thread of the twelfth fastening bolt (88-7), thus fixing the sixth clamp half (88) to the outer end of the sixth fixed arm (84), and the eleventh opening (84-1). The eleventh and twelfth openings (88-1) are combined to form a complete circular third rear axle hole. The eleventh and twelfth grooves (88-5) are combined to form a complete circular sixth bearing mounting groove. The sixth auxiliary bearing is set in the third rear axle hole, and the outer ring of the sixth auxiliary bearing is fixedly set in the sixth bearing mounting groove. The sixth clamp half (88), two sixth ears (88-2), the eleventh opening (84-1), the twelfth opening (88-1), the eleventh groove, the twelfth groove (88-5), the eleventh fastening bolt (88-6), the twelfth fastening bolt (88-7), the eleventh nut (88-8), and the twelfth nut (88-9) constitute the sixth clamp structure. The rear end of the first gear shaft (13) passes through the fourth bearing and the first rear shaft hole, so that the first gear shaft (13) can drive the first bevel gear (11) to rotate relative to the fourth fixed arm (82); the rear end of the second gear shaft (23) passes through the fifth bearing and the second rear shaft hole, so that the second gear shaft (23) can drive the second bevel gear (21) to rotate relative to the fifth fixed arm (83); the rear end of the third gear shaft (33) passes through the sixth bearing and the third rear shaft hole, so that the third gear shaft (33) can drive the third bevel gear (31) to rotate relative to the sixth fixed arm (84).

11. The continuously variable transmission based on gear transmission according to claim 9, characterized in that, The back of the second body part (81) arches towards its front, so that the front of the second body part (81) is an outwardly arched arc surface and its back is an inwardly concave arc surface; the front of the fourth fixing arm (82), the fifth fixing arm (83), and the sixth fixing arm (84) are all smoothly connected to the front of the second body part (81); the back of the fourth fixing arm (82), the fifth fixing arm (83), and the sixth fixing arm (84) are all fixedly connected to the back of the second body part (81) at the same time, forming a second included angle.

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