CN-119682534-B - Coaxial multi-gear electric drive bridge system and vehicle

Abstract

The invention relates to a coaxial multi-gear electric drive bridge system and a vehicle, which can realize the switching of three gears by arranging two gear shifting mechanisms so as to meet the driving requirements under different working conditions. The first gear is used for a low-speed high-torque working condition, the second gear is used for a medium-speed working condition, and the third gear is used for a high-speed working condition, so that the speed ratio coverage range of the system is effectively enlarged. Furthermore, the gear transmission mechanism and the planetary gear assembly are coaxially arranged, so that the structure is compact, the transmission efficiency is high, smooth switching among three gears is realized by reasonably designing the meshing relationship between the tooth sleeves and the combined teeth of the two gear shifting mechanisms, gear shifting impact is avoided, and the driving comfort of the whole vehicle is improved.

Inventors

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Assignees

• 江苏零一汽车科技有限公司

Dates

Publication Date

20260505

Application Date

20241220

Claims (10)

1. 1. The coaxial multi-gear electric drive bridge system is characterized by comprising a motor, a main box and an auxiliary box, wherein a parallel shaft transmission mechanism and a first gear shifting mechanism are arranged in the main box, and a planetary row assembly and a second gear shifting mechanism are arranged in the auxiliary box; the parallel shaft transmission mechanism comprises an input shaft, an intermediate shaft and a sun gear shaft, wherein the input shaft is arranged in parallel with the intermediate shaft, and the input shaft and the sun gear shaft are coaxially arranged; The input end of the input shaft is in transmission connection with the motor, the output end of the input shaft is in transmission connection with the intermediate shaft, and the output end of the input shaft is also provided with a first combination tooth adjacent to the first gear shifting mechanism; The output end of the intermediate shaft is in transmission connection with a first driven gear, and the output end of the first driven gear is provided with a second combination tooth adjacent to the first gear shifting mechanism and a third combination tooth adjacent to the second gear shifting mechanism; the input end of the sun gear shaft is provided with the first gear shifting mechanism, and the sun gear shaft is in transmission connection with the planetary row assembly; the planetary row transmission assembly comprises a planetary carrier, and the input end of the planetary carrier is provided with the second gear shifting mechanism; The first gear shifting mechanism can be selectively engaged with the first engaging tooth or the second engaging tooth, the second gear shifting mechanism can be selectively engaged with or disengaged from the third engaging tooth, and transmission of three forward gears is realized through cooperation of the first gear shifting mechanism and the second gear shifting mechanism; When the planetary gear set is in a first gear transmission state, the first gear shifting mechanism selects a transmission path with a larger reduction ratio, the second gear shifting mechanism enables the planetary gear set assembly to work according to a normal planetary gear rule, and the system obtains the maximum reduction ratio through three-stage reduction; When the planetary gear set is in a second gear transmission state, the first gear shifting mechanism selects a transmission path with a larger reduction ratio, the second gear shifting mechanism enables the planetary gear set assembly to form integral 1:1 transmission, and the system obtains a medium reduction ratio; When the planetary gear set is in a three-gear transmission state, the first gear shifting mechanism selects a direct transmission path, the second gear shifting mechanism enables the planetary gear set assembly to work according to a normal planetary gear law, and the system obtains a minimum reduction ratio.
2. 2. The coaxial multi-gear electric drive bridge system according to claim 1, wherein a constant mesh gear and a first driving gear are fixedly connected to the intermediate shaft, the constant mesh gear is meshed with the input shaft to realize transmission connection of the input shaft and the intermediate shaft, and the first driving gear is meshed with the first driven gear.
3. 3. The coaxial multi-speed electric drive bridge system of claim 2, wherein the first driven gear is hollow and sleeved on the sun gear shaft, and the second and third coupling teeth are fixedly connected and arranged on the first driven gear.
4. 4. The coaxial multi-speed electric drive bridge system of claim 3, wherein the first gear shifting mechanism comprises a first gear hub fixedly coupled to the sun gear shaft and a first gear sleeve axially slidable along the first gear hub, the first gear sleeve being selectively engageable with the first or second coupling teeth.
5. 5. The coaxial multi-speed electric drive bridge system of claim 4, wherein the second gear shifting mechanism includes a second gear hub fixedly coupled to the planet carrier and a second gear sleeve axially slidable along the second gear hub, the second gear sleeve selectively engageable with the third coupling tooth.
6. 6. The coaxial multi-speed electric drive axle system of claim 5, wherein the planetary row assembly further comprises a ring gear, a sun gear, and a planet gear, the sun gear is in driving communication with the sun gear shaft, the planet gear is disposed on the planet carrier, and the planet carrier is in solid communication with the differential assembly.
7. 7. The coaxial multi-speed electric drive bridge system of claim 6, wherein the first tooth sleeve is engaged with the second bond tooth and the second tooth sleeve is disengaged from the third bond tooth when in a first speed transfer state.
8. 8. The coaxial multi-speed electric drive bridge system of claim 6, wherein the first tooth sleeve remains engaged with the second bond tooth and the second tooth sleeve is engaged with the third bond tooth when in a second speed transfer state.
9. 9. The coaxial multi-speed electrically driven bridge system of claim 6, wherein the first sleeve is engaged with the first coupling tooth and the second sleeve is disengaged from the third coupling tooth when in a three-speed transfer state.
10. 10. A vehicle comprising a coaxial multi-speed electric drive axle system according to any one of claims 1-9.

Description

Coaxial multi-gear electric drive bridge system and vehicle Technical Field The invention relates to the technical field of vehicle power systems, in particular to a coaxial multi-gear electric drive bridge system and a vehicle. Background In the field of pure electric vehicles, the transmission efficiency and structural design of an electric drive axle system directly influence the performance of the whole vehicle. In the current electric drive axle system on the market, there is a gear shifting scheme using two-stage planetary gear to match with a clutch and a brake, such as a "two-gear coaxial electric drive axle" disclosed in chinese patent document CN115027256 a. The proposal realizes the transmission of two gears through the gear shifting mode of two clutches and one brake. Although the design can realize the basic gear shifting function, the design has various limitations that firstly, the adopted two-stage planetary gear structure is high in manufacturing difficulty, so that the production cost is high, secondly, the scheme can only realize two-gear transmission, and is difficult to meet the requirement of vehicles on the diversification of transmission ratios under different working conditions, and thirdly, the structure is complex, so that the compactness of the whole arrangement is not facilitated. Therefore, there is a need in the industry for an electric drive axle system that has a simple structure, low manufacturing cost, and can realize multi-gear transmission, so as to meet the high-efficiency operation requirements of the pure electric vehicle under different working conditions. Disclosure of Invention The invention discloses a coaxial multi-gear electric drive bridge system and a vehicle, and aims to solve the technical problems in the prior art. The invention adopts the following technical scheme: on one hand, the embodiment of the invention provides a coaxial multi-gear electric drive bridge system, which comprises a motor, a main box and an auxiliary box, wherein a parallel shaft transmission mechanism and a first gear shifting mechanism are arranged in the main box, and a planetary row assembly and a second gear shifting mechanism are arranged in the auxiliary box; The parallel shaft transmission mechanism comprises an input shaft, an intermediate shaft and a sun gear shaft, wherein the input shaft is arranged in parallel with the intermediate shaft, and the input shaft and the sun gear shaft are coaxially arranged; the input end of the input shaft is in transmission connection with the motor, the output end of the input shaft is in transmission connection with the intermediate shaft, and the output end of the input shaft is also provided with a first combination tooth adjacent to the first gear shifting mechanism; the output end of the intermediate shaft is in transmission connection with a first driven gear, and the output end of the first driven gear is provided with a second combination tooth adjacent to the first gear shifting mechanism and a third combination tooth adjacent to the second gear shifting mechanism; The input end of the sun gear shaft is provided with a first gear shifting mechanism, and the sun gear shaft is in transmission connection with the planetary gear set assembly; the planetary row transmission assembly comprises a planetary carrier, and the input end of the planetary carrier is provided with a second gear shifting mechanism; The first gear shifting mechanism can be selectively engaged with the first engaging tooth or the second engaging tooth, the second gear shifting mechanism can be selectively engaged with or disengaged from the third engaging tooth, and transmission of three forward gears is achieved through cooperation of the first gear shifting mechanism and the second gear shifting mechanism. As an optimal technical scheme, a constant mesh gear and a first driving gear are fixedly connected to the intermediate shaft, the constant mesh gear is meshed with the input shaft to realize transmission connection between the input shaft and the intermediate shaft, and the first driving gear is meshed with a first driven gear. As the preferable technical scheme, the first driven gear is sleeved on the sun gear shaft in a hollow mode, and the second combining teeth and the third combining teeth are fixedly connected to the first driven gear. As a preferred technical solution, the first gear shifting mechanism comprises a first gear hub and a first gear sleeve, the first gear hub is fixedly connected to the sun gear shaft, the first gear sleeve can axially slide along the first gear hub, and the first gear sleeve can be selectively engaged with the first engaging tooth or the second engaging tooth. As a preferred technical solution, the second gear shifting mechanism comprises a second gear hub and a second sliding sleeve, the second gear hub is fixedly connected to the planet carrier, the second gear sleeve can axially slide along the second gear hub, and the