CN113879115A - Electrically driven power transmission device - Google Patents

Electrically driven power transmission device Download PDF

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Publication number
CN113879115A
CN113879115A CN202111293780.XA CN202111293780A CN113879115A CN 113879115 A CN113879115 A CN 113879115A CN 202111293780 A CN202111293780 A CN 202111293780A CN 113879115 A CN113879115 A CN 113879115A
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CN
China
Prior art keywords
gear
shaft
sun gear
power transmission
speed reducing
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Pending
Application number
CN202111293780.XA
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Chinese (zh)
Inventor
韩兵
张天锷
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Shanghai Synetec Power System Co ltd
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Shanghai Synetec Power System Co ltd
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Priority to CN202111293780.XA priority Critical patent/CN113879115A/en
Publication of CN113879115A publication Critical patent/CN113879115A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
    • B60K17/165—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing provided between independent half axles

Abstract

The invention discloses an electric drive power transmission device, which comprises a shell, a drive motor, a planetary gear mechanism, a first friction operation device and a second friction operation device, wherein the planetary gear mechanism comprises a first sun gear, a second sun gear, a planet carrier, a first planetary gear and a second planetary gear which are arranged on the planet carrier, the first planetary gear is meshed with the first sun gear, the second planetary gear is meshed with the second sun gear, and the first friction operation device is arranged to brake the first sun gear; the second friction running device is provided for controlling the first sun gear and the second sun gear to rotate synchronously so as to rotate the planetary gear mechanism as a whole. The electrically-driven power transmission device can keep power output by the mutual matching of the two friction operation devices in the gear shifting process, thereby avoiding the power interruption in the gear shifting process; and the planetary mechanism consisting of the cylindrical outer gear is adopted, so that the processing and the manufacturing are convenient, and the product development difficulty is reduced.

Description

Electrically driven power transmission device
Technical Field
The invention belongs to the technical field of vehicle power transmission, and particularly relates to an electric drive power transmission device.
Background
The motorization of the automobile power system becomes a development trend and becomes an important technical route for energy conservation and emission reduction. At present, a pure electric vehicle in the market mainly adopts a single-speed-ratio reduction box, and the performance of the whole vehicle mainly depends on a driving motor. With the continuous improvement of the performance requirement of the whole vehicle, the torque and the rotating speed of the driving motor need to be improved simultaneously by adopting a single-speed-ratio reduction gearbox, so that the cost is greatly increased. The two-gear pure electric transmission device can meet the requirements of high speed and dynamic property of the whole vehicle, and simultaneously avoids overlarge rotating speed and torque of the motor.
The two-gear electric drive transmission device can improve the performance of the whole automobile, optimize the working range of a drive motor, reduce the consumption of batteries and become a competitive hot spot of the next stage of the electric automobile. Electric automobile relies on the quick response of motor to obtain better driving feel, has higher requirement to the power device smoothness of shifting simultaneously, and the gearshift based on AMT technique has the power interruption problem, hardly satisfies electric automobile's performance requirement.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. The invention provides an electrically driven power transmission device, aiming at realizing power-interruption-free gear shifting.
In order to achieve the purpose, the invention adopts the technical scheme that: an electrically driven power transmission device comprising a housing, a drive motor, a planetary gear mechanism, a first reduction mechanism, a first friction running device and a second friction running device, the planetary gear mechanism comprising a first sun gear, a second sun gear, a planet carrier, and a first planetary gear and a second planetary gear arranged on the planet carrier, the first planetary gear being engaged with the first sun gear, the second planetary gear being engaged with the second sun gear, the first planetary gear being engaged with the second planetary gear, the first friction running device being arranged to brake the first sun gear in a first gear operating mode; the second friction running device is configured to control the first sun gear and the second sun gear to rotate synchronously in the two-gear operating mode, so that the planetary gear mechanism rotates integrally.
The first speed reducing mechanism is connected with a rotor of the driving motor through a first shaft, the first sun gear is arranged on the second shaft, the second sun gear is arranged on the third shaft, the first friction operation device is connected with the shell and the second shaft, the second friction operation device is connected with the second shaft and the third shaft, and the third shaft is connected with the first speed reducing mechanism.
The second shaft is a hollow shaft, and the third shaft penetrates through the second shaft.
The first speed reducing mechanism comprises a first speed reducing gear and a second speed reducing gear which are meshed with each other, the first speed reducing gear is connected with the first shaft, and the second speed reducing gear is connected with the third shaft.
The electric drive power transmission device further comprises a second speed reducing mechanism connected with the planet carrier and the differential mechanism, the second speed reducing mechanism comprises a third speed reducing gear and a fourth speed reducing gear which are meshed with each other, the third speed reducing gear is connected with the planet carrier, and the fourth speed reducing gear is arranged on the differential mechanism.
The first friction operation device is a mechanical mechanism with a rotation speed locking function.
The first friction running device is a friction plate type brake or a one-way clutch with a rotating speed locking function.
The second friction running means is a clutch.
The second friction running device is a friction plate clutch.
The second friction running device is connected with the first sun gear and the planet carrier, or the second friction running device is connected with the second sun gear and the planet carrier.
The electrically-driven power transmission device can keep power output by the mutual matching of the two friction operation devices in the gear shifting process, thereby avoiding the power interruption in the gear shifting process; and the planetary mechanism consisting of the cylindrical outer gear is adopted, so that the processing and the manufacturing are convenient, and the product development difficulty is reduced. The two-gear driving is adopted, the low-speed large torque and high-speed driving requirements can be simultaneously considered, the performance requirements of the motor are reduced, and meanwhile, the efficiency of a power system is favorably improved, and the driving mileage is prolonged.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic structural view of the electrically driven power transmission of the present invention;
FIG. 2 is a control logic diagram between the various gear operating modes and the shift elements;
labeled as: 1. a first shaft; 2. a first reduction gear; 3. a first sun gear; 4. a second sun gear; 5. a first planetary gear; 6. a second planetary gear; 7. a planet carrier; 8. a third reduction gear; 9. a second reduction gear; 10. a third axis; 11. a second shaft; 12. a fourth reduction gear; 13. a half shaft; 14. a rotor of the drive motor; 15. a stator of the driving motor; 16. a differential mechanism; 17. a housing.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
It should be noted that, in the following embodiments, the terms "first", "second" and "third" do not denote absolute differences in structure and/or function, nor do they denote a sequential order of execution, but rather are used for convenience of description.
As shown in fig. 1, the present invention provides an electrically driven power transmission device including a housing 17, a drive motor, a planetary gear mechanism, a first reduction mechanism, a differential 16, a second reduction mechanism, a first friction running device, and a second friction running device. The planetary gear mechanism comprises a first sun gear 3, a second sun gear 4, a planet carrier 7, a first planetary gear 5 and a second planetary gear 6 which are arranged on the planet carrier 7, wherein the first planetary gear 5 is meshed with the first sun gear 3, the second planetary gear 6 is meshed with the second sun gear 4, the first planetary gear 5 is meshed with the second planetary gear 6, a plurality of pairs of the first planetary gear and the second planetary gear are arranged on the circumference of the planet carrier, and a first friction running device is arranged for braking the first sun gear 3 in a first-gear working mode; the second friction running means is provided for controlling the first sun gear 3 and the second sun gear 4 to rotate synchronously in the two-gear operation mode, so that the planetary gear mechanism turns integrally.
Specifically, as shown in fig. 1, the drive motor, the planetary gear mechanism, the first reduction gear mechanism, the differential 16, the second reduction gear mechanism, the first friction running device, and the second friction running device are provided inside the casing 17, the first reduction gear mechanism is connected to the rotor 14 of the drive motor via the first shaft 1, the first sun gear 3 is provided on the second shaft 11, the second sun gear is provided on the third shaft 10, the first friction running device is connected to the casing 17 and the second shaft 11, and the third shaft 10 is connected to the first reduction gear mechanism. The first planet gears 5 and the second planet gears 6 are meshed to form a planet gear pair, the first planet gears 5 and the second planet gears 6 can rotate on a planet carrier 7, the first planet gears 5 and the second planet gears 6 are cylindrical gears, a plurality of groups of the first planet gears 5 and the second planet gears 6 are arranged on the circumference of the planet carrier 7, namely, the first sun gear 3 is simultaneously meshed with a plurality of the first planet gears 5, the second sun gear 4 is simultaneously meshed with a plurality of the second planet gears 6, the number of the first planet gears 5 and the number of the second planet gears 6 are equal, the first sun gear 3 is fixedly arranged on a second shaft 11, the first sun gear 3 and the second sun gear are coaxially arranged, and the second sun gear 4 is fixedly arranged on a third shaft 10, the second sun gear and the second sun gear are coaxially arranged.
As shown in fig. 1, the first speed reducing mechanism includes a first speed reducing gear 2 and a second speed reducing gear 9 which are engaged with each other, the first speed reducing gear 2 is fixedly connected with a first shaft 1, the first shaft 1 is fixedly connected with a rotor 14 of the driving motor, the second speed reducing gear 9 is fixedly connected with a third shaft 10, and the first shaft 1 is parallel to the third shaft 10. The second shaft 11 is a hollow shaft, and the third shaft 10 passes through the second shaft 11. The electrically driven power transmission device of the present invention further includes a second reduction mechanism connected to the carrier 7 and the differential 16, the differential 16 being connected to the half shaft 13, the power being output to the half shaft 13 through the differential 16 and then driving the wheels, the second reduction mechanism including a third reduction gear 8 and a fourth reduction gear 12 that are meshed. The third reduction gear 8 is fixedly connected with the planet carrier 7, the fourth reduction gear 12 is fixedly connected with the differential 16, the third reduction gear 8 is positioned between the second reduction gear 9 and the second sun gear 4, the second sun gear 4 is positioned between the first sun gear 3 and the third reduction gear 8, and a through hole for the third shaft 10 to pass through is arranged at the center of the third reduction gear 8.
The first friction running device is a mechanical mechanism with a rotation speed locking function. Preferably, the first friction running device is a friction plate brake, a one-way clutch with a rotation speed locking function, a coupling device with an internal spline and an external spline as a connection mode, or a combination of a plurality of similar functional mechanisms.
In the present embodiment, as shown in fig. 1, the first friction operating device is a friction plate brake, a passive end of the first friction operating device is fixedly connected with the housing 17, and a driving end of the first friction operating device is fixedly connected with the second shaft 11. When the first friction running device is closed, the second shaft 11 is locked, the second shaft 11 cannot rotate, and the second shaft 11 has zero rotating speed.
The second friction operating device has a plurality of arrangements. A second friction running gear may be provided in connection with the first sun gear 3 and the planet carrier 7, which second friction running gear is arranged between the first sun gear 3 and the planet carrier 7. Alternatively, a second friction running gear may be provided in connection with the second sun gear 4 and the planet carrier 7, the second friction running gear being arranged between the second sun gear 4 and the planet carrier 7.
In the present embodiment, as shown in fig. 1, the second friction running device is connected to the second shaft 11 and the third shaft 10, and the second friction running device is a clutch and is a friction plate clutch. When the second friction running device is closed, the planetary gear mechanism integrally rotates, the first planetary gear 5, the second planetary gear 6, the first sun gear 3, the second sun gear 4 and the planet carrier 7 are relatively static, and a direct gear transmission mode is represented.
By adopting the electric drive power transmission device with the structure, when a vehicle runs at a pure electric low speed, the first friction operation device is in a closed state, the second friction operation device is in a separated state, the electric drive power transmission device is in a first gear working mode, and torque generated by the drive motor is transmitted to the second sun gear 4 through the first speed reduction mechanism to enable the second sun gear 4 to rotate. The first friction running device locks the first sun gear 3, the first sun gear 3 cannot rotate, the planetary gear mechanism is in a fixed speed ratio state at the moment, power is output to the second speed reducing mechanism through the planet carrier 7, and then is transmitted to the vehicle half shaft 13 through the differential mechanism 16, so that the vehicle is driven to run.
Along with the increase of the vehicle speed, the electric drive power transmission device enters a two-gear working mode, the first friction operation device is in a separation state, the second friction operation device is in a closing state, at the moment, the planetary gear mechanism integrally rotates, the gear is directly shifted, and the speed ratio of the planetary gear mechanism is equal to 1. In this gear, the torque generated by the driving motor is transmitted to the second sun gear 4 through the first speed reduction mechanism, so that the second sun gear 4 rotates, the planetary gear mechanism rotates integrally, and the torque is directly output to the second speed reduction mechanism through the planet carrier 7 and then transmitted to the vehicle half shaft 13 through the differential 16, so that the vehicle is driven to run.
The first friction operation device and the second friction operation device are matched with each other in the gear shifting process, power output is kept through the sliding control of the clutch, and power interruption in the gear shifting process is avoided. When the first friction operation device adopts the one-way clutch with the rotating speed locking function, the limitation of positive rotating speed is cancelled before gear shifting (the rotating speed direction of the motor is taken as reference), the gear shifting can be completed only by controlling the clutch, and the gear shifting control difficulty is reduced.
As shown in fig. 2, when the vehicle is driven in a low-speed mode, the electric drive power transmission device is in a first-speed operating mode, the first friction operation device is in a closed state, and the second friction operation device is in a separated state. The first sun gear 3 is locked and fixed to the case 17 as the first-speed electric-only mode EV-1. In the first gear driving, the transmission ratio of the driving motor to the differential 16 is set to iEV|1。
Figure BDA0003335685190000061
Wherein Z is1Number of teeth of the first reduction gear 2, Z2Number of teeth of the second reduction gear 9, Z3Number of teeth of the third reduction gear 8, Z4Number of teeth of the fourth reduction gear 12, Zs1Is the number of teeth of the first sun gear 3, Zs2The number of teeth of the second sun gear 4.
As shown in fig. 2, as vehicle speed increases, while the electrically driven power transmission is in the second gear mode,the first friction running device is in a separated state, the second friction running device is in a closed state, at the moment, the first sun gear 3, the first planet gear, the second sun gear 4 and the planet carrier 7 integrally rotate, and all elements do not move relatively, and as a second gear pure electric mode EV-2, the gear can obtain a higher vehicle speed without causing overhigh rotating speed of a motor. In the second gear drive, the transmission ratio of the drive motor to the differential 16 is set to iEV|2。
Figure BDA0003335685190000071
Wherein Z is1Number of teeth of the first reduction gear 2, Z2Number of teeth of the second reduction gear 9, Z3Number of teeth of the third reduction gear 8, Z4The number of teeth of the fourth reduction gear 12.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.

Claims (10)

1. Electric drive power transmission, including casing, driving motor, planet gear mechanism and first reduction gears, its characterized in that: the planetary gear mechanism comprises a first sun gear, a second sun gear, a planet carrier, a first planetary gear and a second planetary gear, wherein the first planetary gear and the second planetary gear are arranged on the planet carrier; the second friction running device is configured to control the first sun gear and the second sun gear to rotate synchronously in the two-gear operating mode, so that the planetary gear mechanism rotates integrally.
2. The electrically driven power transmission device according to claim 1, characterized in that: the first speed reducing mechanism is connected with a rotor of the driving motor through a first shaft, the first sun gear is arranged on the second shaft, the second sun gear is arranged on the third shaft, the first friction operation device is connected with the shell and the second shaft, the second friction operation device is connected with the second shaft and the third shaft, and the third shaft is connected with the first speed reducing mechanism.
3. The electrically driven power transmission device according to claim 2, characterized in that: the second shaft is a hollow shaft, and the third shaft penetrates through the second shaft.
4. The electrically driven power transmission device according to claim 2 or 3, characterized in that: the first speed reducing mechanism comprises a first speed reducing gear and a second speed reducing gear which are meshed with each other, the first speed reducing gear is connected with the first shaft, and the second speed reducing gear is connected with the third shaft.
5. The electrically driven power transmission device according to claim 2 or 3, characterized in that: the planetary gear type differential mechanism is characterized by further comprising a second speed reducing mechanism connected with the planetary carrier and the differential mechanism, the second speed reducing mechanism comprises a third speed reducing gear and a fourth speed reducing gear which are meshed with each other, the third speed reducing gear is connected with the planetary carrier, and the fourth speed reducing gear is installed on the differential mechanism.
6. The electrically driven power transmission device according to any one of claims 1 to 3, characterized in that: the first friction operation device is a mechanical mechanism with a rotation speed locking function.
7. The electrically driven power transmission device according to claim 6, characterized in that: the first friction running device is a friction plate type brake or a one-way clutch with a rotating speed locking function.
8. The electrically driven power transmission device according to any one of claims 1 to 3, characterized in that: the second friction running means is a clutch.
9. The electrically driven power transmission device according to claim 8, characterized in that: the second friction running device is a friction plate clutch.
10. The electrically driven power transmission device according to claim 1, characterized in that: the second friction running device is connected with the first sun gear and the planet carrier, or the second friction running device is connected with the second sun gear and the planet carrier.
CN202111293780.XA 2021-11-03 2021-11-03 Electrically driven power transmission device Pending CN113879115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111293780.XA CN113879115A (en) 2021-11-03 2021-11-03 Electrically driven power transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111293780.XA CN113879115A (en) 2021-11-03 2021-11-03 Electrically driven power transmission device

Publications (1)

Publication Number Publication Date
CN113879115A true CN113879115A (en) 2022-01-04

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ID=79016226

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN113879115A (en)

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