CN-224214661-U - Transmission, power assembly and tractor

CN224214661UCN 224214661 UCN224214661 UCN 224214661UCN-224214661-U

Abstract

The application provides a speed changer, a power assembly and a tractor, wherein the speed changer comprises a shell, an input and output transmission assembly, an active transmission assembly and a passive transmission assembly, a high-grade passive transmission part and a low-grade passive transmission part are respectively connected with the active transmission assembly in a meshed mode, a gear transmission part can move towards the position close to the low-grade passive transmission part and is meshed with the low-grade passive transmission part, the low-grade passive transmission part can drive an output shaft to rotate at a low speed by driving the gear transmission part to move, or the gear transmission part can move towards the position close to the high-grade passive transmission part and is meshed with the high-grade passive transmission part, and the high-grade passive transmission part can drive the output shaft to rotate at a high speed by driving the gear transmission part to move. The transmission is internally integrated with three parts, wherein the input and output transmission assembly is used for the power output part, the active transmission assembly is used for transmitting force, the passive transmission assembly is used for outputting, the whole structure is simple, redundant transmission parts for realizing reversing are not needed, and the occupied space of the whole transmission is saved.

Inventors

MA XIAODONG
FAN JIAN
MAO XUELUN
Mou Sikong
MOU HONGREN

Assignees

潍柴雷沃(潍坊)农业装备有限公司

Dates

Publication Date: 20260508
Application Date: 20250714

Claims (10)

1. The transmission is characterized by comprising a shell, an input and output transmission assembly, an active transmission assembly and a passive transmission assembly; An input cavity capable of placing the input and output transmission assembly, a main transmission cavity for placing the active transmission assembly and a passive transmission cavity for placing the passive transmission assembly are formed in the shell at intervals; The input and output transmission assembly is in meshed connection with the active transmission assembly, so that the input and output transmission assembly can drive the active transmission assembly to rotate along a first direction or a second direction; The driven transmission assembly comprises an output shaft, a high-grade driven transmission part and a low-grade driven transmission part which are sleeved on the output shaft at intervals through a bearing part, and a gear transmission part which is sleeved on the output shaft and is positioned between the high-grade driven transmission part and the low-grade driven transmission part; The high-speed driven transmission part and the low-speed driven transmission part are respectively connected with the driving transmission component in a meshed mode, the gear transmission part can move towards the position close to the low-speed driven transmission part and is meshed with the low-speed driven transmission part, so that the low-speed driven transmission part can drive the output shaft to rotate at a low speed by driving the gear transmission part to move, or the gear transmission part can move towards the position close to the high-speed driven transmission part and is meshed with the high-speed driven transmission part, so that the high-speed driven transmission part can drive the output shaft to rotate at a high speed by driving the gear transmission part to move.
2. The transmission of claim 1, wherein the input-output drive assembly comprises an input shaft, an input gear, and a cover plate assembly; The input shaft is arranged in the input cavity through a bearing, and the input gear is sleeved on the input shaft; The input shaft is formed with an input end capable of extending out of the housing and a driven end sealed to the housing by the cover plate assembly along both ends of the input shaft in the length direction.
3. The transmission of claim 2, wherein the drive assembly comprises an idler shaft, a high range drive gear, and a low range drive gear; The inert shaft is arranged in the main transmission cavity through a bearing, and the high-grade driving gear and the low-grade driving gear are respectively sleeved on the inert shaft through spline intervals; The input gear is meshed with the high-grade driving gear, so that the rotation of the input shaft can drive the high-grade driving gear to rotate; The inert shaft is sealed to the housing along the length thereof and on the same side as the driven end by the cover plate assembly.
4. A transmission according to claim 3, wherein an internally splined spacer is also provided on the idler shaft between the high range and low range drive gears to provide a predetermined clearance between the high range and low range drive gears.
5. A transmission according to claim 3, wherein the cover assembly comprises a cover plate and a snap spring; The shell is provided with a mounting groove, the clamp spring can be placed in the mounting groove, and the cover plate is limited on the shell, so that the cover plate seals the driven end in the input cavity and seals the inert shaft in the main transmission cavity.
6. The transmission of claim 3, wherein the high-range passive gear comprises a high-range passive gear capable of being in meshed connection with the high-range driving gear, and the low-range passive gear comprises a low-range passive gear capable of being in meshed connection with the low-range driving gear; the root part of the high-grade driven transmission gear and the root part of the low-grade driven transmission gear are provided with tooth parts which can be meshed with the meshing sleeve; When the meshing sleeve moves towards the position close to the low-gear driven transmission gear and is meshed with the tooth parts of the tooth sleeve and the low-gear driven transmission gear at the same time, the output shaft can be driven to rotate at a low speed through the low-gear driving gear; When the meshing sleeve moves towards the high-grade passive transmission gear and is meshed with the tooth sleeve and the tooth part of the high-grade passive transmission gear, the output shaft can be driven to rotate at a high speed through the high-grade driving gear.
7. The transmission of claim 1, wherein the housing is provided with a lubrication oil inlet and a lubrication oil return port; The shell is provided with a lubricating oil inlet for guiding lubricating oil to the shell at a fourth preset position, and a lubricating oil return port for guiding lubricating oil is arranged at a fifth preset position.
8. A powertrain comprising an electric machine and a transmission as claimed in any one of claims 1 to 7; The power output shaft of the motor is connected with the output shaft so as to drive the output shaft to rotate along the first direction or rotate along the second direction; The shell of the motor and the shell are positioned at a first preset position through a positioning pin, and are fastened at a second preset position through a fixing piece; the shell of the motor and the surface of the shell, which are mutually fixed, are fixed surfaces, and the fixed surfaces are provided with sealing layers.
9. The powertrain of claim 8, further comprising a rear axle housing and an air pressure balancing line; The shell is provided with an air pressure balance port at a third preset position, one end of the air pressure balance pipeline is communicated with the air pressure balance port, and the other end of the air pressure balance pipeline is communicated with the rear axle box body, so that air pressure in the shell is the same as air pressure in the rear axle box body, and lubricating oil in the shell is consistent with the liquid level of lubricating oil in the rear axle box body.
10. A tractor is characterized in that, comprising a powertrain as claimed in claim 8 or 9.

Description

Transmission, power assembly and tractor Technical Field The application relates to the technical field of agricultural machinery, in particular to a transmission, a power assembly and a tractor. Background A Transmission (english) also known as a gearbox is a mechanism for changing rotational speed and torque, which can change the Transmission ratio of an output shaft and an input shaft in a fixed or stepped manner. However, the existing transmission has a complex structure of the internal gear transmission part, occupies a relatively large space of the whole vehicle, and cannot meet the existing small design requirement on the whole vehicle. Therefore, there is a need for a transmission, a powertrain, and a tractor that solve the technical problems of the prior art to some extent. Disclosure of utility model The application aims to provide a transmission, a power assembly and a tractor, which save occupied space to a certain extent. The application provides a speed changer, which comprises a shell, an input and output transmission assembly, an active transmission assembly and a passive transmission assembly, wherein the input and output transmission assembly is arranged on the shell; An input cavity capable of placing the input and output transmission assembly, a main transmission cavity for placing the active transmission assembly and a passive transmission cavity for placing the passive transmission assembly are formed in the shell at intervals; The input and output transmission assembly is in meshed connection with the active transmission assembly, so that the input and output transmission assembly can drive the active transmission assembly to rotate along a first direction or a second direction; The driven transmission assembly comprises an output shaft, a high-grade driven transmission part and a low-grade driven transmission part which are sleeved on the output shaft at intervals through a bearing part, and a gear transmission part which is sleeved on the output shaft and is positioned between the high-grade driven transmission part and the low-grade driven transmission part; The high-speed driven transmission part and the low-speed driven transmission part are respectively connected with the driving transmission component in a meshed mode, the gear transmission part can move towards the position close to the low-speed driven transmission part and is meshed with the low-speed driven transmission part, so that the low-speed driven transmission part can drive the output shaft to rotate at a low speed by driving the gear transmission part to move, or the gear transmission part can move towards the position close to the high-speed driven transmission part and is meshed with the high-speed driven transmission part, so that the high-speed driven transmission part can drive the output shaft to rotate at a high speed by driving the gear transmission part to move. In the above technical solution, further, the input-output transmission assembly includes an input shaft, an input gear, and a cover plate assembly; The input shaft is arranged in the input cavity through a bearing, and the input gear is sleeved on the input shaft; The input shaft is formed with an input end capable of extending out of the housing and a driven end sealed to the housing by the cover plate assembly along both ends of the input shaft in the length direction. In the above technical solution, further, the driving transmission assembly includes an idler shaft, a high-gear driving gear, and a low-gear driving gear; The inert shaft is arranged in the main transmission cavity through a bearing, and the high-grade driving gear and the low-grade driving gear are respectively sleeved on the inert shaft through spline intervals; The input gear is meshed with the high-grade driving gear, so that the rotation of the input shaft can drive the high-grade driving gear to rotate; The inert shaft is sealed to the housing along the length thereof and on the same side as the driven end by the cover plate assembly. In the above technical scheme, further, an internal spline spacer is sleeved on the inert shaft and located between the high-grade driving gear and the low-grade driving gear, so that a preset gap is reserved between the high-grade driving gear and the low-grade driving gear. In the above technical solution, further, the cover plate assembly includes a cover plate and a clip spring; The shell is provided with a mounting groove, the clamp spring can be placed in the mounting groove, and the cover plate is limited on the shell, so that the cover plate seals the driven end in the input cavity and seals the inert shaft in the main transmission cavity. In the technical scheme, the high-grade driven transmission part comprises a high-grade driven transmission gear which can be in meshed connection with the high-grade driving gear, and the low-grade driven transmission part comprises a low-grade driven transmission gear which can be in meshed connect