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CN-115750693-B - Two-gear speed reducer, vehicle with two-gear speed reducer and control method of vehicle

CN115750693BCN 115750693 BCN115750693 BCN 115750693BCN-115750693-B

Abstract

The invention provides a two-gear speed reducer, a vehicle with the two-gear speed reducer and a control method of the vehicle. The two-gear speed reducer comprises an input shaft, a first-stage speed reduction driving gear is arranged on the input shaft, a third-stage speed reduction driven gear and a main speed reduction driving gear are arranged on a first intermediate shaft, a first-stage speed reduction driven gear, a second-stage speed reduction driving gear and a synchronizer are arranged on a second intermediate shaft, a second-stage speed reduction driven gear and a third-stage speed reduction driving gear are arranged on a transition shaft, the second-stage speed reduction driven gear is meshed with the second-stage speed reduction driving gear, the third-stage speed reduction driving gear is meshed with the third-stage speed reduction driven gear, a driven end of a multi-plate clutch is fixedly connected with the first intermediate shaft, a driven end of the multi-plate clutch is fixedly connected with the second intermediate shaft, and a main speed reduction driven gear is arranged on a shell of the differential and meshed with the main speed reduction driving gear. The scheme can realize larger first gear ratio and improve the dynamic performance of the vehicle.

Inventors

  • MEI XIANGNAN
  • XU ZHAN
  • ZHAO XUESONG
  • ZHAO CHENGFU
  • BAO XUANMING
  • LI YUFANG

Assignees

  • 中国第一汽车股份有限公司

Dates

Publication Date
20260512
Application Date
20221130

Claims (9)

  1. 1. A two-speed reducer, comprising: The device comprises an input shaft (1), wherein one end of the input shaft (1) is connected with a driving part, a primary reduction driving gear (5) is arranged on the input shaft (1), and the primary reduction driving gear (5) is fixedly connected with the input shaft (1) in a coaxial way; The device comprises a first intermediate shaft (13), wherein a three-stage speed reduction driven gear (10) and a main speed reduction driving gear (14) are arranged on the first intermediate shaft (13), and the three-stage speed reduction driven gear (10) and the main speed reduction driving gear (14) are coaxially and fixedly connected with the first intermediate shaft (13); the second intermediate shaft (11), the second intermediate shaft (11) is sleeved outside the first intermediate shaft (13), a first-stage reduction driven gear (7), a second-stage reduction driving gear (9) and a synchronizer (8) are arranged on the second intermediate shaft (11), the first-stage reduction driven gear (7) and the first-stage reduction driving gear (5) are meshed, the second-stage reduction driving gear (9) is sleeved on the second intermediate shaft (11), and the synchronizer (8) has an engagement state connected with the second-stage reduction driving gear (9) and a separation state separated from the second-stage reduction driving gear (9); The transition shaft (4), be provided with second grade speed reduction driven gear (3) and tertiary speed reduction driving gear (2) on the transition shaft (4), second grade speed reduction driven gear (3) with tertiary speed reduction driving gear (2) all with the coaxial fixed connection of transition shaft (4), second grade speed reduction driven gear (3) with second grade speed reduction driving gear (9) meshing sets up, tertiary speed reduction driving gear (2) with tertiary speed reduction driven gear (10) meshing sets up; The driven end of the multi-disc clutch (6) is fixedly connected with the first intermediate shaft (13), and the driven end of the multi-disc clutch (6) is fixedly connected with the second intermediate shaft (11); The differential mechanism (16), the differential mechanism (16) is provided with an output shaft, a main speed reduction driven gear (15) is arranged on a shell of the differential mechanism (16), the main speed reduction driven gear (15) is fixedly connected with the differential mechanism (16) in a coaxial way, and the main speed reduction driven gear (15) is meshed with the main speed reduction driving gear (14); The two-gear speed reducer further comprises an overrunning clutch (12), the second intermediate shaft (11) is connected with the two-stage reduction driving gear (9) through the overrunning clutch (12), when the rotating speed of the second intermediate shaft (11) is larger than that of the two-stage reduction driving gear (9), the second intermediate shaft (11) is connected with the two-stage reduction driving gear (9) and rotates synchronously, and when the rotating speed of the second intermediate shaft (11) is smaller than that of the two-stage reduction driving gear (9), the second intermediate shaft (11) is disconnected with the two-stage reduction driving gear (9) and rotates freely.
  2. 2. The two-speed reducer according to claim 1, characterized in that the transition shaft (4) is sleeved outside the input shaft (1).
  3. 3. A two-speed reducer according to claim 1, characterized in that the input shaft (1) is arranged parallel to the first intermediate shaft (13).
  4. 4. A two-speed reducer according to claim 1, characterized in that the transition shaft (4) is arranged parallel to the first intermediate shaft (13).
  5. 5. A vehicle having a two-speed reduction gear, wherein the two-speed reduction gear is a two-speed reduction gear as claimed in any one of claims 1 to 4.
  6. 6. A control method of a vehicle for controlling the vehicle according to claim 5, characterized by comprising: the multi-plate clutch (6) is controlled to be separated, the synchronizer (8) is controlled to be in the joint state, the overrunning clutch (12) is controlled to be in the joint state, so that the vehicle is in a first gear, power is sequentially transmitted along the primary reduction driving gear (5), the primary reduction driven gear (7), the secondary reduction driving gear (9), the secondary reduction driven gear (3), the tertiary reduction driving gear (2), the tertiary reduction driven gear (10), the main reduction driving gear (14) and the main reduction driven gear (15), and the transmission speed ratio of the two-gear speed reducer is a first speed ratio.
  7. 7. The method of claim 6, wherein the method further comprises: And controlling the engagement of the multi-plate clutch (6), controlling the synchronizer (8) to be in the separation state, and controlling the overrunning clutch (12) to be in the separation state so as to enable the vehicle to be in a second gear, wherein power is sequentially transmitted along the primary reduction driving gear (5), the primary reduction driven gear (7), the main reduction driving gear (14) and the main reduction driven gear (15), and the transmission speed ratio of the two-gear speed reducer is a second speed ratio.
  8. 8. The method of claim 6, wherein the method further comprises: The multi-disc clutch (6) is controlled to be separated, the synchronizer (8) is controlled to be in the separation state, the overrunning clutch (12) is in the separation state, and the first intermediate shaft (13) is disconnected from the second intermediate shaft (11) so as to enable the vehicle to be in a neutral gear.
  9. 9. The method of claim 6, wherein the method further comprises: The multi-plate clutch (6) is controlled to be engaged, the synchronizer (8) is controlled to be in the engaged state, the overrunning clutch (12) is in the disengaged state, and the first intermediate shaft (13) is in the locking state so as to enable the vehicle to be in a parking gear.

Description

Two-gear speed reducer, vehicle with two-gear speed reducer and control method of vehicle Technical Field The invention relates to the technical field of vehicle design and manufacture, in particular to a two-gear speed reducer, a vehicle with the two-gear speed reducer and a control method of the vehicle. Background In the field of pure electric vehicles, most of electric drive systems in the market at present are composed of a drive motor and a single-gear speed reducer, wherein on one hand, the drive motor is different from a traditional fuel engine in characteristics, the drive motor can provide large torque at a low rotating speed, and meanwhile, the drive motor has a wider rotating speed range, so that a complex multi-gear speed changer is not needed any more, the drive motor and the single-gear speed reducer can meet the dynamic and economic demands of most vehicle types, and on the other hand, the single-gear speed reducer has the advantages of high transmission efficiency, small development difficulty, low cost and the like. With the rapid development of the electric vehicle market, the requirements of customers on vehicle performance are increasingly improved, for example, for common pure electric vehicles, medium and high speed energy consumption needs to be reduced to increase the endurance mileage, for pure electric vehicles, higher acceleration and highest vehicle speed are needed, and for large pure electric SUVs or pickup cards, larger low-speed wheel side torque is needed. The single-gear speed reducer with fixed transmission ratio can not meet the requirements of all working conditions, and the two-gear speed reducer can effectively improve the dynamic property and economical efficiency of the whole vehicle through two speed ratios. The first scheme is to realize a new gear by adding a pair of gear sets on the basis of a single-gear speed reducer, the speed ratio of the two gears in the scheme is formed by two-stage speed reduction, the structure is relatively simple, the transmission efficiency is higher, the speed ratio formed by two-stage speed reduction means that a larger center distance is required to realize a larger first-gear large speed ratio (such as a first-gear speed ratio above 15) to meet the power performance requirement of the whole vehicle while ensuring that the reasonable second-gear speed ratio meets the economic requirement of the whole vehicle, and the center distance is limited by the arrangement space of the whole vehicle, so that the scheme is difficult to realize the larger first-gear speed ratio in a limited space, and the second scheme is to add a planetary gear mechanism between the two-stage speed reduction gear sets on the basis of the single-gear speed reducer, and form two speed ratios by controlling a sun gear, a planetary gear and a gear ring gear, but the structure is relatively complex, and the transmission efficiency and NVH quality are reduced to a certain extent by adopting the planetary gear mechanism. Aiming at the technical problem that a larger first gear ratio cannot be realized under the limited center distance, no effective solution is proposed at present. Disclosure of Invention The invention mainly aims to provide a two-gear speed reducer, a vehicle with the two-gear speed reducer and a control method of the vehicle, so as to solve the problem that a larger one-gear speed ratio cannot be realized under a limited center distance in the prior art. In order to achieve the above object, according to one aspect of the present invention, there is provided a two-gear speed reducer comprising an input shaft, one end of the input shaft is connected with a driving part, a primary speed reduction driving gear is arranged on the input shaft and is fixedly connected with the input shaft coaxially, a first intermediate shaft is provided with a tertiary speed reduction driven gear and a main speed reduction driving gear, the tertiary speed reduction driven gear and the main speed reduction driving gear are fixedly connected with the first intermediate shaft coaxially, a second intermediate shaft is sleeved outside the first intermediate shaft and is provided with a primary speed reduction driven gear, a secondary speed reduction driving gear and a synchronizer, the primary speed reduction driven gear is meshed with the primary speed reduction driving gear and is sleeved on the second intermediate shaft, the synchronizer is provided with an engagement state connected with the secondary speed reduction driving gear and a separation state separated from the secondary speed reduction driving gear, a transition shaft is arranged on the transition shaft, the secondary speed reduction driven gear and the tertiary speed reduction driving gear are fixedly connected with the first intermediate shaft coaxially, the secondary speed reduction driven gear is arranged on the second intermediate shaft coaxially with the secondary speed reduction driving gear and the seco