CN-121993556-A - Stepless speed changing box of ECVT tractor

CN121993556ACN 121993556 ACN121993556 ACN 121993556ACN-121993556-A

Abstract

The invention discloses a stepless gearbox of an ECVT tractor, which comprises an input shaft, a generator, a driving motor, a first clutch, a second clutch, a first sun gear, a plurality of first planet gears, a first gear ring, a first planet carrier, a second sun gear, a plurality of second planet gears, a second gear ring, a second planet carrier and an output gear, wherein the generator is arranged on the input shaft, the input shaft drives the generator to generate power, the driving motor is sleeved on the input shaft in an empty mode, the first sun gear is fixedly connected with an output shaft of the driving motor in a coaxial mode, the first clutch is respectively connected with the input shaft and the second sun gear, and the second clutch is respectively connected with the first planet carrier and the second sun gear. The invention adopts the electromechanical coupling stepless speed change scheme of the engine-generator-driving motor, cancels the traditional multi-gear shifting mechanism, has no power interruption of shifting, and has compact structure, high transmission efficiency and reliability.

Inventors

LAI ZHE
ZHANG DENG
DAI HU
LU KAI
DONG QI
PAN JIA
LI XINGYA
CHEN YONGGANG
CHEN CHENG
GUO WANLONG

Assignees

杭州前进齿轮箱集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260212

Claims (10)

1. The continuously variable transmission of the ECVT tractor is characterized by comprising an input shaft (1), a generator (2), a driving motor (3), a first clutch (A), a second clutch (B), a first sun gear (4), a plurality of first planetary gears (5), a first gear ring (6), a first planet carrier (71), a second sun gear (9), a plurality of second planetary gears (33), a second gear ring (72), a second planet carrier and an output gear (81), wherein the generator (2) is arranged on the input shaft (1), the input shaft (1) drives the generator (2) to generate electricity, the driving motor (3) is sleeved on the input shaft (1), the first sun gear (4) is coaxially and fixedly connected with an output shaft of the driving motor (3), the first sun gear (4) is externally meshed with the plurality of first planetary gears (5), the plurality of first planetary gears (5) are internally meshed with the first gear ring (6), the first gear ring (6) is fixedly arranged on a box body of the transmission, the first planetary gears (5) are fixedly meshed with the first planetary gears (72) through the first planet carrier (71) at one end of the first planetary gears (72) which is coaxially connected with the second planetary gears (72), a plurality of second planet gears (33) are externally meshed with a sun gear, the sun gear is sleeved on an input shaft (1), the second planet gears (33) are installed at one end of the second planet carrier through bearings, the other end of the second planet carrier is fixedly connected with an output gear (81) coaxially or integrally formed, power is output through the output gear (81), a first clutch (A) is respectively connected with the input shaft (1) and a second sun gear (9), the input shaft (1) is combined with and separated from the second sun gear (9) through combination and separation of friction plates in the first clutch (A), and a second clutch (B) is respectively connected with a first planet carrier (71) and the second sun gear (9) and realizes combination and separation of the first planet carrier (71) and the second sun gear (9) through combination and separation of friction plates in the second clutch (B).
2. The continuously variable transmission of an ECVT tractor as claimed in claim 1, characterized in that the first clutch (a) comprises first inner friction plates and first outer friction plates arranged in a staggered manner, the inner sides of the first inner friction plates are in splined connection with the inner hub of the first clutch (a), the outer sides of the first inner friction plates are in splined connection with the outer hub of the first clutch (a), the inner hub of the first clutch (a) is fixedly connected or integrally formed coaxially with the input shaft (1), and the outer hub of the first clutch (a) is fixedly connected or integrally formed coaxially with the second sun gear (9).
3. The continuously variable transmission of an ECVT tractor as claimed in claim 2, characterized in that the second clutch (B) comprises second inner friction plates and second outer friction plates which are arranged in a staggered manner, the inner sides of the second inner friction plates are in spline connection with the inner hub of the second clutch (B), the outer sides of the second inner friction plates are in spline connection with the outer hub of the second clutch (B), the inner hub of the second clutch (B) is fixedly connected or integrally formed with the second sun gear (9) coaxially, and the outer hub of the second clutch (B) is fixedly connected or integrally formed coaxially with the first planet carrier (71).
4. A continuously variable transmission for an ECVT tractor as claimed in claim 3, characterized in that the inner hub of the second clutch (B) is fixedly connected coaxially or integrally formed with the outer hub of the first clutch (a).
5. The continuously variable transmission of an ECVT tractor according to claim 1, further comprising a first gear (82), a second gear (10), a third gear (11), a first transmission shaft (32) and a transmission high-low gear synchronizer (F), wherein the first gear (82) is sleeved on the input shaft (1) and fixedly connected coaxially with the output gear (81), the second gear (10) is sleeved on the first transmission shaft (32) with the third gear (11), the first transmission shaft (32) is in transmission connection with the rear axle input shaft (1), the second gear (10) is in transmission connection with the output gear (81) in a meshing manner, the third gear (11) is in transmission connection with the second gear (10), the transmission high-low gear synchronizer (F) is arranged between the second gear (10) and the third gear (11) and is fixedly connected circumferentially and rotates synchronously with the first transmission shaft (32), and the transmission high-low gear synchronizer (F) can be combined with or separated from the second gear (10) or the third gear (11).
6. The ECVT tractor stepless speed change box as claimed in claim 5, further comprising a front axle clutch (D), a front drive output shaft (29), a front drive first transmission gear (34), a front drive second transmission gear (12) and a front drive third transmission gear (13), wherein the front drive first transmission gear (34) and the first transmission shaft (32) are circumferentially and fixedly rotated synchronously, the front drive second transmission gear (12) is in meshed transmission connection with the front drive first transmission gear (34), the front drive third transmission gear (13) is in meshed transmission connection with the front drive second transmission gear (12), the front drive third transmission gear (13) is sleeved on the front drive output shaft (29), the front axle clutch (D) is respectively connected with the front drive output shaft (29) and the front drive third transmission gear (13), and the combination and the separation of the front drive third transmission gear (13) and the front drive output shaft (29) are controlled through the combination and the separation of friction plates in the front axle clutch (D).
7. The continuously variable transmission of the ECVT tractor as claimed in claim 1, further comprising a fourth gear (14), a fifth gear (15) and a sixth gear (16), wherein the fourth gear (14) is fixedly connected and rotates synchronously with the input shaft (1), the fifth gear (15) is meshed with the fourth gear (14), the sixth gear (16) is meshed with the fifth gear (15), and an output end of the sixth gear (16) is connected with the oil pump (35).
8. The continuously variable transmission of an ECVT tractor as claimed in claim 7, characterized in that the fifth gear (15) and the sixth gear (16) are mounted on the housing of the transmission by means of bearings.
9. The continuously variable transmission of the ECVT tractor according to claim 1, further comprising a PTO clutch (C), a second transmission shaft (31), a PTO output shaft (30), a seventh gear (17), an eighth gear (18), a ninth gear (19), a tenth gear (20) and a PTO high-low gear synchronizer (E), wherein the PTO clutch (C) is respectively connected to the input shaft (1) and the second transmission shaft (31), the engagement and the disengagement of the input shaft (1) and the second transmission shaft (31) are realized by a friction plate and the engagement and disengagement in the PTO clutch (C), the seventh gear (17) and the eighth gear (18) are coaxially fixed on the second transmission shaft (31) and synchronously rotate, the ninth gear (19) and the tenth gear (20) are coaxially and idly sleeved on the PTO output shaft (30), the ninth gear (19) is in meshed transmission connection with the seventh gear (17), the PTO (20) is in meshed transmission connection with the eighth gear (18), the high-low gear synchronizer (E) is circumferentially fixed with the PTO output shaft (30), and the ninth gear (20) is capable of being engaged or disengaged with the PTO (20).
10. The continuously variable transmission of an ECVT tractor as claimed in claim 1, characterized in that the output end of the first drive shaft (32) is coaxially connected to a first bevel gear (21), the first bevel gear (21) being in driving connection with the rear axle.

Description

Stepless speed changing box of ECVT tractor Technical Field The invention relates to the technical field of gearboxes, in particular to a stepless gearbox of an ECVT tractor. Background The existing tractor transmission system mainly comprises step transmission (mechanical gear shifting and power gear shifting) and stepless transmission (HST, V belt mechanical stepless speed change and CVT). The CVT technology realizes stepless speed regulation through combination of hydrostatic and mechanical transmission, improves the working efficiency and the driving comfort, but has the defects of insufficient transmission efficiency, low reliability of core components and restriction of large-scale application in a high-horsepower tractor. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a stepless speed change box of an ECVT tractor, which can improve transmission efficiency and reliability at the same time. In order to achieve the above purpose, the present invention adopts the following technical scheme: The continuously variable transmission of the ECVT tractor comprises an input shaft, a generator, a driving motor, a first clutch, a second clutch, a first sun gear, a plurality of first planet gears, a first gear ring, a first planet carrier, a second sun gear, a plurality of second planet gears, a second gear ring, a second planet carrier and an output gear, wherein the generator is arranged on the input shaft, the input shaft drives the generator to generate electricity, the driving motor is sleeved on the input shaft, the first sun gear is fixedly connected with an output shaft of the driving motor in a coaxial way, the driving motor is driven to rotate, the first sun gear is externally meshed with the plurality of first planet gears, the plurality of first planet gears are internally meshed with the first gear ring, the first gear ring is fixedly arranged on a box body of the transmission, the first planet gears are arranged at one end of the first planet carrier through bearings, the other end of the first planet carrier is fixedly connected with the second gear ring gear in a coaxial way or integrally formed, the plurality of second planet gears are internally meshed with the second gear ring, the second planet gears are sleeved on the input shaft through bearings, the other end of the second planet carrier is fixedly connected with the second planet carrier through the second planet carrier, the other end of the second planet carrier is coaxially separated from the first planet carrier through the first clutch, and the first clutch is respectively connected with the first clutch, and the first clutch is combined with the first clutch, and the first clutch is separated from the first clutch, and the second clutch is respectively, and the first clutch is combined with the first clutch. In some embodiments, the first clutch comprises first inner friction plates and first outer friction plates which are arranged in a staggered manner, the inner sides of the first inner friction plates are in spline connection with the first clutch inner hub, the outer sides of the first inner friction plates are in spline connection with the first clutch outer hub, the first clutch inner hub is coaxially and fixedly connected with the input shaft or integrally formed, and the first clutch outer hub is coaxially and fixedly connected with the second sun gear or integrally formed. In some embodiments, the second clutch includes staggered second inner friction plates and second outer friction plates, the second inner friction plates The inner side of the second clutch inner hub is in spline connection with the second clutch outer hub, the outer side of the second inner friction plate is in spline connection with the second clutch outer hub, the second clutch inner hub is coaxially and fixedly connected with the second sun gear or integrally formed, and the second clutch outer hub is coaxially and fixedly connected with the first planet carrier or integrally formed. In some embodiments, the second clutch inner hub is fixedly connected coaxially or integrally formed with the first clutch outer hub. In some embodiments, the transmission further comprises a first gear, a second gear, a third gear, a first transmission shaft and a transmission high-low gear synchronizer, wherein the first gear is sleeved on the input shaft and is fixedly connected with the output gear coaxially, the second gear and the third gear are sleeved on the first transmission shaft, the first transmission shaft is in transmission connection with the rear axle input shaft, the second gear is in meshed transmission connection with the output gear, the third gear is in meshed transmission connection with the second gear, the transmission high-low gear synchronizer is arranged between the second gear and the third gear and is fixedly connected with the circumference of the first transmission shaft to rotate synchronous