CN117249234A - Double-motor input two-gear speed reducer and control method - Google Patents

Double-motor input two-gear speed reducer and control method Download PDF

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Publication number
CN117249234A
CN117249234A CN202311135389.6A CN202311135389A CN117249234A CN 117249234 A CN117249234 A CN 117249234A CN 202311135389 A CN202311135389 A CN 202311135389A CN 117249234 A CN117249234 A CN 117249234A
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CN
China
Prior art keywords
speed
gear
shaft
transmission
disconnecting
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Pending
Application number
CN202311135389.6A
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Chinese (zh)
Inventor
袁子龙
汪雪峰
舒正荣
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Foshan Xianhu Hydrogen Power Technology Co ltd
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Foshan Xianhu Hydrogen Power Technology Co ltd
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Application filed by Foshan Xianhu Hydrogen Power Technology Co ltd filed Critical Foshan Xianhu Hydrogen Power Technology Co ltd
Priority to CN202311135389.6A priority Critical patent/CN117249234A/en
Publication of CN117249234A publication Critical patent/CN117249234A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
    • F16H3/46—Gearings having only two central gears, connected by orbital gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
    • F16H2200/0043—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising four forward speeds

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Transmissions (AREA)

Abstract

The invention discloses a double-motor input two-gear speed reducer, which comprises two planetary gear sets, an intermediate transmission mechanism and a differential mechanism, wherein the input ends of the two planetary gear sets are respectively connected with a first input shaft and a second input shaft, and the output ends of the two planetary gear sets are respectively connected with a first transmission shaft and a second transmission shaft; the intermediate transmission mechanism comprises a first intermediate shaft, a second intermediate shaft, a first low-speed transmission gear set, a second low-speed transmission gear set and a high-speed transmission gear set; the differential input end is in transmission connection with the second intermediate shaft. The speed reducer has a relatively compact structure, and the arrangement space of the whole vehicle is saved; because of the structural style of two gears of the double motor that can be adopted, can confirm the driving mode according to the working condition of traveling, have improved dynamic property and economy of the electric automobile to a certain extent, make the motor work under the working condition of high efficiency as much as possible.

Description

Double-motor input two-gear speed reducer and control method
Technical Field
The invention relates to the field of automobiles, in particular to a double-motor input two-gear speed reducer and a control method.
Background
Currently, a speed reducer used for an electric automobile is generally of a single-gear and multi-parallel-shaft structure with a fixed speed ratio, and the speed reducer of the type occupies a larger space and is difficult to meet the requirement that the electric automobile tends to reduce the arrangement space of a transmission system so as to seek more space for arranging components such as a high-speed motor, a power battery and the like. Along with the continuous breakthrough of the high-speed motor technology used by the vehicle, the limit rotation speed of the motor is higher and higher, higher requirements are provided for a speed reducer used by the electric vehicle, the speed reduction ratio of the speed reducer needs to be properly increased to meet the use requirement of the high-speed motor, the occupied space of the planetary gear set is smaller than that of the cylindrical gear set under the same speed reduction ratio, and a plurality of groups of parallel shafts are required to be arranged only by using the speed reducer with a parallel shaft structure to realize the larger speed reduction ratio, so that the speed reducer occupies a larger arrangement space, and unnecessary noise is generated due to the meshing transmission of the multistage cylindrical gears, and the overall NVH performance of the vehicle is influenced. Meanwhile, requirements of electric vehicles on dynamic property and economy are gradually improved, particularly, higher requirements are put forward on the endurance mileage, starting and acceleration performance of the electric vehicles, the single-stage speed reducer can achieve low-rotation-speed and high-torque output, and the vehicle has strong acceleration performance, but under actual driving conditions, the load rate of a motor is low, the economy is poor, the endurance capability of the vehicle is affected, and the requirement on both economy and dynamic property is difficult to be met by a single driving mode of the single motor, so that a novel speed reducer is needed to meet the requirements.
Disclosure of Invention
The invention aims to provide a double-motor input two-gear speed reducer and a control method thereof, which are used for solving one or more technical problems in the prior art and at least providing a beneficial selection or creation condition.
The technical scheme adopted for solving the technical problems is as follows:
first, the present invention provides a dual-motor input two-gear speed reducer, comprising: the planetary gear sets are provided with two, the input ends of the two planetary gear sets are respectively connected with a first input shaft and a second input shaft, and the output ends of the two planetary gear sets are respectively connected with a first transmission shaft and a second transmission shaft; the middle transmission mechanism comprises a first middle shaft, a second middle shaft, a first low-speed transmission gear set, a second low-speed transmission gear set and a high-speed transmission gear set, wherein one end of the first middle shaft is in disconnection and connection transmission with a first transmission shaft through a first disconnection and connection assembly, the other end of the first middle shaft is in disconnection and connection transmission with a second transmission shaft through a second disconnection and connection assembly, the first middle shaft is in speed-increasing transmission connection with the second middle shaft through the high-speed transmission gear set, the first transmission shaft is in speed-reducing transmission connection with one end of the second middle shaft through the first low-speed transmission gear set, the second transmission shaft is in speed-reducing transmission connection with the other end of the second middle shaft through the second low-speed transmission gear set, a third disconnection and connection assembly for realizing disconnection and connection transmission is arranged between the second middle shaft and the first low-speed transmission gear set, and a fourth disconnection and connection assembly for realizing disconnection and connection transmission is arranged between the second middle shaft and the second low-speed transmission gear set; and the input end of the differential mechanism is in transmission connection with the second intermediate shaft.
The beneficial effects of the invention are as follows: the speed reducer has a relatively compact structure, and the arrangement space of the whole vehicle is saved; because of the structural style of two gears of the double motor that can be adopted, can confirm the driving mode according to the working condition of traveling, have improved dynamic property and economy of the electric automobile to a certain extent, make the motor work under the working condition of high efficiency as much as possible.
As a further improvement of the technical scheme, the device also comprises a speed reduction shell;
the first low-speed transmission gear set and the second low-speed transmission gear set respectively comprise a low-speed driving gear and a low-speed driven gear which are meshed with each other, the two low-speed driving gears are respectively fixedly sleeved on a first transmission shaft and a second transmission shaft, and the two low-speed driven gears are respectively rotatably installed in a speed reduction shell through a first support shaft and a second support shaft;
the first disconnecting and connecting assembly, the second disconnecting and connecting assembly, the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly respectively comprise a connecting gear ring and a connecting sleeve which can be mutually connected and disconnected, the connecting gear rings are coaxially fixed on the two low-speed driving gears, the connecting sleeves are axially sleeved at the two ends of the first intermediate shaft in a sliding mode, the connecting gear rings are coaxially fixed on the two low-speed driven gears, and the connecting sleeves are axially sleeved at the two ends of the second intermediate shaft in a sliding mode.
As a further improvement of the technical scheme, the high-speed transmission gear set comprises a high-speed driving gear and a high-speed driven gear which are meshed with each other, the high-speed driving gear is fixedly sleeved on the first intermediate shaft, and the high-speed driven gear is fixedly sleeved on the second intermediate shaft.
As a further improvement of the above technical solution, the high-speed driving gear is disposed in the middle of the first intermediate shaft, and the high-speed driven gear is disposed in the middle of the second intermediate shaft.
As a further improvement of the above technical solution, the high-speed driving gear has a larger number of teeth than the high-speed driven gear, and the low-speed driving gear has a smaller number of teeth than the low-speed driven gear.
As a further improvement of the technical scheme, the planetary gear set comprises a sun gear, planet gears, planet carriers and a fixed gear ring, wherein the two sun gears are respectively connected with a first input shaft and a second input shaft, the planet gears are meshed with the sun gear, the fixed gear ring is fixed in a speed reduction shell, the planet gears are meshed with the fixed gear ring, and the two planet carriers are respectively fixedly connected with a first transmission shaft and a second transmission shaft.
As a further improvement of the technical scheme, the two planetary gear sets are symmetrically arranged in the speed reduction shell, the first transmission shaft and the second transmission shaft are coaxially arranged in a left-right opposite mode, and the left end and the right end of the first intermediate shaft are coaxially supported on the two low-speed driving gears through needle bearings respectively.
As a further improvement of the technical scheme, the first support shaft and the second support shaft are coaxially arranged in a left-right opposite mode, and the left end and the right end of the second intermediate shaft are coaxially supported on the two low-speed driven gears respectively through needle bearings.
As a further improvement of the technical scheme, the second intermediate shaft is fixedly sleeved with a middle gear, the differential mechanism comprises a differential driving gear, a differential shell, differential planet gears, a planet gear shaft and two side gears, the differential driving gear is arranged on the outer side of the differential shell and meshed with the middle gear, the planet gear shaft is arranged in the differential shell, the differential planet gears are sleeved on the planet gear shaft, the two side gears are meshed with the differential planet gears, and the two side gears are respectively and coaxially connected with a first output shaft and a second output shaft.
In addition, the invention also provides a control method of the two-gear speed reducer suitable for the double-motor input, which comprises the following steps:
the first input shaft and the second input shaft are respectively connected with a motor;
when the first disconnecting and connecting assembly is connected, the second disconnecting and connecting assembly, the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are disconnected, a motor connected with the first input shaft is in a working state, the other motor is braked, and the driving mode is high-speed gear and single motor driving;
when the second disconnecting and connecting assembly is connected, the first disconnecting and connecting assembly, the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are disconnected, the motor connected with the second input shaft is in a working state, the other motor is braked, and the driving mode is high-speed gear and single motor driving;
when the first disconnecting and connecting component and the second disconnecting and connecting component are connected, the third disconnecting and connecting component and the fourth disconnecting and connecting component are disconnected, motors on two sides are in a working state, and the driving mode is high-speed gear double-motor driving;
when the third disconnecting and connecting assembly is connected, the first disconnecting and connecting assembly, the second disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are disconnected, the motor connected with the first input shaft is in a working state, the other motor is braked, and the driving mode is low-speed gear and single motor driving;
when the fourth disconnecting and connecting assembly is connected, the first disconnecting and connecting assembly, the second disconnecting and connecting assembly and the third disconnecting and connecting assembly are disconnected, the motor connected with the second input shaft is in a working state, the other motor is braked, and the driving mode is low-speed gear and single motor driving;
when the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are connected, the first disconnecting and connecting assembly and the second disconnecting and connecting assembly are disconnected, the motors on two sides are in working states, and the driving mode is low-speed gear double-motor driving.
Drawings
The invention is further described below with reference to the drawings and examples;
FIG. 1 is a schematic diagram of a speed reducer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the power transmission path of the speed reducer of the present invention in a low gear, single motor drive mode;
FIG. 3 is a schematic diagram of the power transmission path of the speed reducer of the present invention in a low gear, dual motor drive mode;
FIG. 4 is a schematic diagram of the power transmission path of the speed reducer of the present invention in a high gear, single motor drive mode;
fig. 5 is a schematic diagram of the power transmission path of the speed reducer of the present invention in a high gear, dual motor drive mode.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, if there is a word description such as "a plurality" or the like, the meaning of a plurality is one or more, and the meaning of a plurality is two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1 to 5, the two-speed reduction gear of the present invention makes the following embodiments:
the two-speed reduction gear of the present embodiment includes a reduction case 100, two planetary gear sets, an intermediate transmission mechanism, and a differential.
The two planetary gear sets are divided into a first planetary gear set 200 and a second planetary gear set 300, the first planetary gear set 200 is disposed at the left side in the reduction housing 100, the second planetary gear set 300 is disposed at the right side in the reduction housing 100, and the first planetary gear set 200 and the second planetary gear set 300 are disposed in bilateral symmetry.
The first planetary gear set 200 and the second planetary gear set 300 are both provided with an input end and an output end, the input end of the first planetary gear set 200 is connected with a first input shaft 210 extending leftwards and rightwards, the input end of the second planetary gear set 300 is connected with a second input shaft 310 extending leftwards and rightwards, the first input shaft 210 extends leftwards, the second input shaft 310 extends rightwards, the left end of the first input shaft 210 is connected with one of motors, and the right end of the second input shaft 310 is connected with the other motor.
The output end of the first planetary gear set 200 is connected to a first transmission shaft 260 extending in a left-right direction, and the output end of the second planetary gear set 300 is connected to a second transmission shaft 360 extending in a left-right direction.
Specifically: the first planetary gear set 200 comprises a first sun gear 220, a first planet carrier 230, a first planet gear 240 and a first fixed gear ring 250, the second planetary gear set 300 comprises a second sun gear 320, a second planet carrier 330, a second planet gear 340 and a second fixed gear ring 350, the first sun gear 220 is sleeved on the first input shaft 210 and is in transmission connection with the first input shaft 210, the second sun gear 320 is sleeved on the second input shaft 310 and is in transmission connection with the second input shaft 310, the first planet gear 240 is meshed with the first sun gear 220, the second planet gear 340 is meshed with the second sun gear 320, the first gear ring is fixedly connected with the reduction housing 100, the second gear ring is fixedly connected with the reduction housing 100, the first planet gear 240 is meshed with the first fixed gear ring 250, and the second planet gear 340 is meshed with the second fixed gear ring 350.
The left end of the first transmission shaft 260 is fixedly connected with the first planet carrier 230, the right end of the second transmission shaft 360 is fixedly connected with the second planet carrier, and the first transmission shaft 260 and the second transmission shaft 360 are coaxially arranged left and right oppositely.
The intermediate transmission mechanism comprises a first intermediate shaft 400, a second intermediate shaft 500, a first low-speed transmission gear set, a second low-speed transmission gear set and a high-speed transmission gear set, wherein the first intermediate shaft 400 extends between the first transmission shaft 260 and the second transmission shaft 360 left and right, and the first intermediate shaft 400 and the first transmission shaft 260 and the second transmission shaft 360 are coaxially arranged.
The left end of the first intermediate shaft 400 is in transmission with the first transmission shaft 260 in a disconnectable and engageable manner through a first disconnection and engagement assembly, the right end of the first intermediate shaft 400 is in transmission with the second transmission shaft 360 in a disconnectable and engageable manner through a second disconnection and engagement assembly, the second intermediate shaft 500 and the first intermediate shaft 400 are arranged in the reduction housing 100 at intervals in parallel, and a high-speed transmission gear set is connected between the second intermediate shaft 500 and the first intermediate shaft 400 so as to realize speed-increasing transmission of the second intermediate shaft 500 and the first intermediate shaft 400;
the first transmission shaft 260 is in speed-reducing transmission connection with the left end of the second intermediate shaft 500 through a first low-speed transmission gear set, and the second transmission shaft 360 is in speed-reducing transmission connection with the right end of the second intermediate shaft 500 through a second low-speed transmission gear set;
in this embodiment, a third disconnect assembly is disposed between the left end of the second intermediate shaft 500 and the first low-speed transmission gear set, the third disconnect assembly can realize disconnect and connect transmission between the second intermediate shaft 500 and the first transmission shaft 260, and a fourth disconnect assembly is disposed between the left end of the second intermediate shaft 500 and the second low-speed transmission gear set, so as to realize disconnect and connect transmission between the right end of the second intermediate shaft 500 and the second transmission shaft 360.
Specifically: the high-speed transmission gear set comprises a high-speed driving gear 410 and a high-speed driven gear 510, the high-speed driving gear 410 is fixedly sleeved on the first intermediate shaft 400, the high-speed driven gear 510 is fixedly sleeved on the second intermediate shaft 500, the high-speed driving gear 410 is meshed with the high-speed driven gear 510, and the number of teeth of the high-speed driving gear 410 is larger than that of the high-speed driven gear 510, so that high-speed transmission is realized.
The high-speed driving gear 410 is disposed in the middle of the first intermediate shaft 400, and the high-speed driven gear 510 is disposed in the middle of the second intermediate shaft 500, so that the stress is more uniform.
The first low-speed driving gear set includes a first low-speed driving gear 600 and a first low-speed driven gear 610, the first low-speed driving gear 600 is fixedly sleeved on the first transmission shaft 260, the first low-speed driven gear 610 is installed at the left side in the reduction housing 100 through the first supporting shaft 620, wherein the first low-speed driving gear 600 is meshed with the first low-speed driven gear 610, and the first low-speed driving gear 600 has smaller number of teeth than the first low-speed driven gear 610, so as to realize low-speed transmission.
The second low-speed transmission gear set includes a second low-speed driving gear 700 and a second low-speed driven gear 710, the second low-speed driving gear 700 is fixedly sleeved on the second transmission shaft 360, the second low-speed driven gear 710 is installed at the left side in the reduction housing 100 through the second support shaft 720, wherein the second low-speed driving gear 700 is meshed with the second low-speed driven gear 710, and the second low-speed driving gear 700 has smaller number of teeth than the second low-speed driven gear 710, so as to realize low-speed transmission.
And the second intermediate shaft 500 is coaxially disposed between the second low-speed driven gear 710 and the first low-speed driven gear 610.
And the first disconnect coupling assembly includes a first coupling ring gear 630, a first coupling sleeve 640, the first coupling ring gear 630 being fixed to the right end of the first low-speed drive gear 600, and the first coupling sleeve 640 being slidably fitted over the left end of the first intermediate shaft 400, the first coupling sleeve 640 being axially movable and being engageable with the first coupling ring gear 630.
The second disconnect coupling assembly includes a second coupling ring gear 730, a second coupling sleeve 740, the second coupling ring gear 730 being fixed to the left end of the second low-speed driving gear 700, and the second coupling sleeve 740 being slidably fitted over the right end of the first intermediate shaft 400, the second coupling sleeve 740 being axially movable and engageable with the second coupling ring gear 730.
The third disconnecting engagement assembly comprises a third engagement gear ring 650 and a third engagement sleeve 660, wherein the third engagement gear ring 650 is fixed on the right end of the first low-speed driven gear 610, the third engagement sleeve 660 is slidably sleeved on the left end of the second intermediate shaft 500, and the third engagement sleeve 660 can move along the axial direction and can be meshed with the third engagement gear ring 650;
the fourth disconnecting engagement assembly includes a fourth engagement ring gear 750, a fourth engagement sleeve 760, the fourth engagement ring gear 750 being fixed to the left end of the second low-speed driven gear 710, and the fourth engagement sleeve 760 being slidably fitted over the right end of the second intermediate shaft 500, the fourth engagement sleeve 760 being axially movable and engageable with the fourth engagement ring gear 750.
The joint sleeve is in single-side joint.
Both the left and right ends of the first intermediate shaft 400 of the present embodiment are coaxially supported in the inner circular holes of the first and second low-speed driving gears 600 and 700 through needle bearings.
And both left and right ends of the second intermediate shaft 500 are coaxially supported in the inner circular holes of the first low-speed driven gear 610 and the second low-speed driven gear 710 through needle bearings.
Wherein the input of the differential is connected to the second intermediate shaft 500, in particular: the second intermediate shaft 500 is fixedly provided with a middle gear 520;
the differential mechanism comprises a differential driving gear 800, a differential housing 810, a differential planetary gear 820, a planetary gear shaft 830 and two side gears 840, wherein the differential driving gear 800 is positioned at the outer side of the differential housing 810, the differential driving gear 800 is meshed with the middle gear 520, the planetary gear shaft 830 is arranged in the differential housing 810, the differential planetary gear 820 is sleeved on the planetary gear shaft 830, the two side gears 840 are simultaneously meshed with the differential planetary gear 820, the two side gears 840 are respectively and coaxially connected with a first output shaft 850 and a second output shaft 860, and the first output shaft 850 and the second output shaft 860 are respectively sleeved with a left wheel and a right wheel.
Setting the numbers of teeth of the first sun gear 220 and the second sun gear 320 to be Z 1 The number of teeth of the first planetary gear 240 and the second planetary gear 340 is Z 2 ，a＝Z 2 /Z 1 ；
Setting the number of teeth of the first and second low-speed driving gears 600, 700 to be Z 3 The number of teeth of the first-speed driven gear and the second-speed driven gear is Z 4 ，b＝Z 4 /Z 3 ；
The number of teeth of the high-speed driving gear 410 is Z 5 The number of teeth of the high-speed driven gear 510 is Z 6 ，c＝Z 6 /Z 5 ；
The number of teeth of the middle gear 520 is Z 7 The differential driving gear 800 has a number of teeth Z 8 ，d＝Z 8 /Z 7 ；
The low gear reduction ratio is: i.e 1 ＝1+a·b·d；
The high gear reduction ratio is: i.e 2 ＝1+a·c·d。
The power transmission process with the reduction gear in the low gear, single motor drive mode is described below with reference to fig. 2:
taking the left motor driving as an example, at this time, the third engagement sleeve 660 is engaged with the third engagement gear ring 650, the power is input from the left motor through the first input shaft 210, the power is transmitted to the first planet carrier 230 through the first sun gear 220 and the first planet gears 240 of the first planetary gear set 200, the first planet carrier 230 transmits the power to the first low-speed driving gear 600 through the first transmission shaft 260, at this time, the first engagement sleeve 640 is not engaged with the first engagement gear ring 630, so the power is not transmitted to the first intermediate shaft 400, and is directly transmitted to the first low-speed driven gear 610 through the first low-speed driving gear 600, because the third engagement sleeve 660 is engaged with the third engagement gear ring 650, the power is transmitted to the second intermediate shaft 500, the intermediate gear 520 is fixedly connected to the second intermediate shaft 500, the power is transmitted to the differential driving gear 800, and finally the power is transmitted to the left and right wheels through the differential, and the driving mode is suitable for the working conditions with relatively small driving torque requirements such as low-speed climbing and slow starting, so that the motor is in a proper high-load working state, and the economical efficiency of the vehicle can be improved.
The power transmission process of the reduction gear in the low gear, two-motor drive mode is described below with reference to fig. 3:
at this time, the motors on the left and right sides output power, the third engagement sleeve 660 and the fourth engagement sleeve 760 are engaged with the third engagement gear 650 and the fourth engagement gear 750, respectively, the left motor power is input through the first input shaft 210, and is transmitted to the first carrier 230 through the first sun gear 220 and the first planet gears 240 of the first planetary gear set 200, the first carrier 230 transmits the power to the first low-speed driving gear 600 through the first transmission shaft 260, similarly, the right motor power is input through the second input shaft 310, and is transmitted to the second carrier 330 through the second sun gear 320 and the second planet gears 340 of the second planetary gear set 300, and the second carrier 330 transmits the power to the second low-speed driving gear 700 through the second transmission shaft 360, so that when the third engagement sleeve 660 and the fourth engagement sleeve 760 are engaged with the third engagement gear 650 and the fourth engagement gear 750, the left and right motor power is transmitted to the second intermediate shaft 500 through the first low-speed driven gear 610 and the second low-speed driven gear 710, and is finally transmitted to the intermediate shaft 500 through the gear 520, and finally, the power is transmitted to the differential gear 520 through the differential, which is suitable for a high-speed vehicle with a steep-speed and a high-speed driving condition, and a high-speed driving condition.
The power transmission process of the reduction gear in the high gear, single motor drive mode is described below with reference to fig. 4:
taking the left motor driving as an example, at this time, the first engagement sleeve 640 is engaged with the first engagement gear ring 630, the power is input from the left motor through the first input shaft 210, and is transmitted to the first planet carrier 230 through the first sun gear 220 and the first planet gears 240 of the first planetary gear set 200, the first planet carrier 230 transmits the power to the first low-speed driving gear 600 through the first transmission shaft 260, at this time, the first engagement sleeve 640 is engaged with the first engagement gear ring 630, so that the power is transmitted to the first intermediate shaft 400, the high-speed driving gear 410 located on the first intermediate shaft 400 is transmitted to the high-speed driven gear 510, and the high-speed driven gear 510 is fixed on the second intermediate shaft 500, so that the power is transmitted to the second intermediate shaft 500, and is transmitted to the differential driving gear 800 through the intermediate gear 520 arranged on the intermediate shaft, and finally the power is transmitted to the left and right wheels through the differential, and the driving mode is suitable for the working condition that the driving torque requirements of the medium-low-speed cruising state and the like are small, and at the same time, the normal operation of the other side motor can be ensured when the single-side motor is in fault, so that the driving function of the vehicle is maintained, and the redundancy of the driving system is improved.
The power transmission process of the reduction gear in the high gear, two-motor drive mode is described below with reference to fig. 5:
at this time, the motors on the left and right sides output power, the first engagement sleeve 640, the second engagement sleeve 740 are engaged with the first engagement ring gear 630 and the second engagement ring gear 730, respectively, the left motor power is input through the first input shaft 210, transmitted to the first carrier 230 through the first sun gear 220 and the first planet gears 240 of the first planetary gear set 200, the first carrier 230 transmits power to the first low-speed driving gear 600 through the first transmission shaft 260, similarly, the right motor power is input through the second input shaft 310, transmitted to the second carrier 330 through the second sun gear 320 and the second planet gears 340 of the second planetary gear set 300, the second carrier 330 transmits power to the second low-speed driving gear 700 through the second transmission shaft 360, at this time, the first engagement sleeve 640 and the second engagement sleeve 740 are engaged with the first engagement gear ring 630 and the second engagement gear ring 730, the left power is transmitted to the first intermediate shaft 400, the right power is transmitted to the first intermediate shaft 400, at this time, the left power and the right power are converged on the first intermediate shaft 400, and then the high-speed driving gear 410 positioned on the first intermediate shaft 400 is transmitted to the high-speed driven gear 510, and the high-speed driven gear 510 is fixed on the second intermediate shaft 500, so that the power is transmitted to the second intermediate, and the middle gear 520 arranged thereon is transmitted to the differential driving gear 800, and the final power is transmitted to the left and right wheels through the differential mechanism.
The size of the speed reducer is properly reduced under the requirement of meeting the reduction ratio, the arrangement space in the speed reducer is fully utilized, and the switching of different driving modes and gears is realized to meet the driving requirement.
While the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present invention, and these are intended to be included in the scope of the present invention as defined in the appended claims.

Claims (10)

1. A two-gear speed reducer with double motor input is characterized in that: comprising the following steps:
the planetary gear sets are provided with two, the input ends of the two planetary gear sets are respectively connected with a first input shaft and a second input shaft, and the output ends of the two planetary gear sets are respectively connected with a first transmission shaft and a second transmission shaft;
the middle transmission mechanism comprises a first middle shaft, a second middle shaft, a first low-speed transmission gear set, a second low-speed transmission gear set and a high-speed transmission gear set, wherein one end of the first middle shaft is in disconnection and connection transmission with a first transmission shaft through a first disconnection and connection assembly, the other end of the first middle shaft is in disconnection and connection transmission with a second transmission shaft through a second disconnection and connection assembly, the first middle shaft is in speed-increasing transmission connection with the second middle shaft through the high-speed transmission gear set, the first transmission shaft is in speed-reducing transmission connection with one end of the second middle shaft through the first low-speed transmission gear set, the second transmission shaft is in speed-reducing transmission connection with the other end of the second middle shaft through the second low-speed transmission gear set, a third disconnection and connection assembly for realizing disconnection and connection transmission is arranged between the second middle shaft and the first low-speed transmission gear set, and a fourth disconnection and connection assembly for realizing disconnection and connection transmission is arranged between the second middle shaft and the second low-speed transmission gear set;
and the input end of the differential mechanism is in transmission connection with the second intermediate shaft.
2. The dual motor input two speed reducer of claim 1, wherein: the device also comprises a speed reduction shell;
the first low-speed transmission gear set and the second low-speed transmission gear set respectively comprise a low-speed driving gear and a low-speed driven gear which are meshed with each other, the two low-speed driving gears are respectively fixedly sleeved on a first transmission shaft and a second transmission shaft, and the two low-speed driven gears are respectively rotatably installed in a speed reduction shell through a first support shaft and a second support shaft;
the first disconnecting and connecting assembly, the second disconnecting and connecting assembly, the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly respectively comprise a connecting gear ring and a connecting sleeve which can be mutually connected and disconnected, the connecting gear rings are coaxially fixed on the two low-speed driving gears, the connecting sleeves are axially sleeved at the two ends of the first intermediate shaft in a sliding mode, the connecting gear rings are coaxially fixed on the two low-speed driven gears, and the connecting sleeves are axially sleeved at the two ends of the second intermediate shaft in a sliding mode.
3. The dual motor input two speed reducer of claim 2, wherein:
the high-speed transmission gear set comprises a high-speed driving gear and a high-speed driven gear which are meshed with each other, the high-speed driving gear is fixedly sleeved on the first intermediate shaft, and the high-speed driven gear is fixedly sleeved on the second intermediate shaft.
4. A dual motor input two speed reducer as defined in claim 3 wherein:
the high-speed driving gear is arranged in the middle of the first intermediate shaft, and the high-speed driven gear is arranged in the middle of the second intermediate shaft.
5. A dual motor input two speed reducer as defined in claim 3 wherein:
the high-speed driving gear has a larger number of teeth than the high-speed driven gear, and the low-speed driving gear has a smaller number of teeth than the low-speed driven gear.
6. The dual motor input two speed reducer of claim 2, wherein:
the planetary gear set comprises a sun gear, planet gears, planet carriers and a fixed gear ring, wherein the sun gear is respectively connected with a first input shaft and a second input shaft, the planet gears are meshed with the sun gear, the fixed gear ring is fixed in a speed reduction shell, the planet gears are meshed with the fixed gear ring, and the two planet carriers are respectively fixedly connected with a first transmission shaft and a second transmission shaft.
7. The dual motor input two speed reducer of claim 2, wherein:
the two planetary gear sets are symmetrically arranged in the speed reduction shell, the first transmission shaft and the second transmission shaft are coaxially arranged in a left-right opposite mode, and the left end and the right end of the first intermediate shaft are coaxially supported on the two low-speed driving gears through needle bearings respectively.
8. The dual motor input two speed reducer of claim 2, wherein:
the first support shaft and the second support shaft are coaxially arranged in a left-right opposite mode, and the left end and the right end of the second intermediate shaft are coaxially supported on the two low-speed driven gears through needle bearings respectively.
9. The dual motor input two speed reducer of claim 1, wherein:
the second intermediate shaft is fixedly sleeved with a middle gear, the differential mechanism comprises a differential driving gear, a differential shell, differential planet gears, planet gears and two side gears, the differential driving gear is arranged on the outer side of the differential shell and meshed with the middle gear, the planet gears are arranged in the differential shell, the differential planet gears are sleeved on the planet gears, the two side gears are meshed with the differential planet gears, and the two side gears are respectively and coaxially connected with a first output shaft and a second output shaft.
10. A control method of a two-speed reduction gear adapted for double motor input as claimed in any one of claims 1 to 9, characterized in that: the specific method comprises the following steps:
the first input shaft and the second input shaft are respectively connected with a motor;
when the first disconnecting and connecting assembly is connected, the second disconnecting and connecting assembly, the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are disconnected, a motor connected with the first input shaft is in a working state, the other motor is braked, and the driving mode is high-speed gear and single motor driving;
when the second disconnecting and connecting assembly is connected, the first disconnecting and connecting assembly, the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are disconnected, the motor connected with the second input shaft is in a working state, the other motor is braked, and the driving mode is high-speed gear and single motor driving;
when the first disconnecting and connecting component and the second disconnecting and connecting component are connected, the third disconnecting and connecting component and the fourth disconnecting and connecting component are disconnected, motors on two sides are in a working state, and the driving mode is high-speed gear double-motor driving;
when the third disconnecting and connecting assembly is connected, the first disconnecting and connecting assembly, the second disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are disconnected, the motor connected with the first input shaft is in a working state, the other motor is braked, and the driving mode is low-speed gear and single motor driving;
when the fourth disconnecting and connecting assembly is connected, the first disconnecting and connecting assembly, the second disconnecting and connecting assembly and the third disconnecting and connecting assembly are disconnected, the motor connected with the second input shaft is in a working state, the other motor is braked, and the driving mode is low-speed gear and single motor driving;
when the third disconnecting and connecting assembly and the fourth disconnecting and connecting assembly are connected, the first disconnecting and connecting assembly and the second disconnecting and connecting assembly are disconnected, the motors on two sides are in working states, and the driving mode is low-speed gear double-motor driving.
CN202311135389.6A 2023-09-04 2023-09-04 Double-motor input two-gear speed reducer and control method Pending CN117249234A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311135389.6A CN117249234A (en) 2023-09-04 2023-09-04 Double-motor input two-gear speed reducer and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311135389.6A CN117249234A (en) 2023-09-04 2023-09-04 Double-motor input two-gear speed reducer and control method

Publications (1)

Publication Number Publication Date
CN117249234A true CN117249234A (en) 2023-12-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311135389.6A Pending CN117249234A (en) 2023-09-04 2023-09-04 Double-motor input two-gear speed reducer and control method

Country Status (1)

Country Link
CN (1) CN117249234A (en)

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