CN109469714B - Two-gear automatic speed-changing electric driving wheel assembly - Google Patents

Two-gear automatic speed-changing electric driving wheel assembly Download PDF

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Publication number
CN109469714B
CN109469714B CN201710807608.9A CN201710807608A CN109469714B CN 109469714 B CN109469714 B CN 109469714B CN 201710807608 A CN201710807608 A CN 201710807608A CN 109469714 B CN109469714 B CN 109469714B
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CN
China
Prior art keywords
gear
brake
gear shifting
friction block
cylinder piston
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CN201710807608.9A
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Chinese (zh)
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CN109469714A (en
Inventor
段福海
王豫
陈军
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Guangzhou Xinyu Power Technology Co Ltd
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Guangzhou Xinyu Power Technology Co Ltd
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Application filed by Guangzhou Xinyu Power Technology Co Ltd filed Critical Guangzhou Xinyu Power Technology Co Ltd
Priority to CN201710807608.9A priority Critical patent/CN109469714B/en
Priority to US16/033,222 priority patent/US10851881B2/en
Priority to EP19193979.2A priority patent/EP3591261B1/en
Priority to EP18184329.3A priority patent/EP3502512B1/en
Priority to KR1020180091382A priority patent/KR101982799B1/en
Priority to JP2018153481A priority patent/JP6462174B1/en
Publication of CN109469714A publication Critical patent/CN109469714A/en
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Publication of CN109469714B publication Critical patent/CN109469714B/en
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Classifications

    • 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
    • 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
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • 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
    • F16H63/3023—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure
    • F16H63/3026—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes
    • 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
    • F16H2057/02034—Gearboxes combined or connected with electric machines
    • 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
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
    • F16H2057/02052—Axle units; Transfer casings for four wheel drive
    • 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
    • F16H2057/02086—Measures for reducing size of gearbox, e.g. for creating a more compact transmission casing
    • 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
    • F16H63/3023—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure
    • F16H63/3026—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes
    • F16H2063/303—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes the friction member is actuated and released by applying pressure to different fluid chambers
    • 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
    • F16H2200/0034—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising two forward speeds
    • 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
    • F16H2200/20—Transmissions using gears with orbital motion
    • F16H2200/2002—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears
    • F16H2200/201—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears with three sets of 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
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/20—Transmissions using gears with orbital motion
    • F16H2200/203—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes
    • F16H2200/2035—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes with two engaging means

Abstract

The invention discloses a two-gear automatic speed-changing electric driving wheel assembly, which comprises a tire, a hub, a braking device, an I-gear shifting device, an II-gear shifting device, a planetary gear transmission device, a motor and an integrated box body, wherein the wheel hub is provided with a first gear and a second gear; the integrated box body is arranged in the inner cavity of the hub; the integrated box body comprises an inner cavity for installing the planetary gear transmission device and an outer cavity for installing the motor; the stator is fixedly connected with the outer cavity wall of the integrated box body, the rotor is of a hollow structure, and the inner cavity of the integrated box body is arranged in the rotor cavity; one end of the planetary gear transmission device is connected with the rotor; the other end of the planetary gear transmission device is connected with the hub; the planetary gear transmission device is also connected with a braking device; and the outer side of the front end cover of the integrated box body is uniformly provided with an I gear shifting device and a II gear shifting device which are connected with the planetary gear transmission device respectively. The invention has high transmission efficiency, small volume, light weight, low cost, long service life and high power density.

Description

Two-gear automatic speed-changing electric driving wheel assembly
Technical Field
The invention relates to the field of driving assemblies for vehicles, in particular to a two-gear automatic speed change electric driving wheel assembly.
Background
Automobile emissions and energy consumption have become a worldwide problem, and therefore, low-emission and low-energy consumption pure electric vehicles and hybrid electric vehicles are one of the main flows of current automobile industry development, especially as the pure electric vehicles and plug-in hybrid electric vehicles are continuously developed, a more compact, more integrated and more efficient power assembly is one of the development cores of the automobile industry. The driving assembly is simpler in design, more reliable in a low-loss gear shifting mode and more high-speed light-weight motor, and becomes an optimal scheme for solving the problem of driving assemblies for pure electric vehicles and plug-in hybrid electric vehicles.
As for the electric driving wheel assembly for electric automobile, there are two main types of pure electric driving axles: the motor directly drives the wheel scheme and the motor+fixed speed ratio speed reducer drives the wheel scheme. For the scheme of directly driving the wheels by the motor, as the wheels are the last-stage power driving parts, the torque requirement of the driving motor is very large, the rotating speed is lower, the volume and the weight of the motor are excessively large, the unsprung mass and the rotational inertia of the wheels of the whole vehicle are greatly increased, and the problems of poor comfort of the whole vehicle, reduced reliability of a suspension, deteriorated reliability of a braking device, low electric driving efficiency and the like are caused; for the motor and fixed speed ratio speed reducer driving wheel scheme, although partial problems caused by large motor volume and weight in the motor direct driving scheme are solved to a certain extent, the driving motor is difficult to drive under full working conditions and high efficiency due to large load change of the whole vehicle, large speed change of the vehicle and the like, so that the electric driving efficiency is low.
Disclosure of Invention
The invention aims to solve the technical problem of providing a two-gear automatic speed-changing electric driving wheel assembly which reduces loss, reduces the volume and the mass of a motor, improves transmission efficiency, reliability and service life.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the two-gear automatic speed change electric driving wheel assembly comprises a tire, a hub, a braking device, an I gear shifting device, an II gear shifting device, a planetary gear transmission device, a motor and an integrated box body; the integrated box body is arranged in the inner cavity of the hub;
the motor comprises a rotor and a stator, and the integrated box body comprises an inner cavity for installing the planetary gear transmission device and an outer cavity for installing the motor;
the stator is fixedly connected with the outer cavity wall of the integrated box body, the rotor is of a hollow structure, and the inner cavity of the integrated box body is arranged in the rotor cavity;
one end of the planetary gear transmission device is connected with the rotor, and the motor rotor realizes power output to the planetary gear transmission device; the other end of the planetary gear transmission device is connected with the hub, and the planetary gear transmission device realizes power output to the hub;
the planetary gear transmission device is also connected with a braking device; the outer side of the front end cover of the integrated box body is uniformly provided with an I gear shifting device and an II gear shifting device which are connected with a planetary gear transmission device respectively;
the I gear shifting device and the II gear shifting device are used for adjusting the running state of the planetary gear transmission device, so that the planetary gear transmission device realizes I gear output, II gear output or neutral gear output.
Further, the planetary gear transmission device comprises a first annular gear, a second annular gear, a third annular gear, a first planet wheel, a second planet wheel, a third planet wheel, a planet wheel shaft, a rotating arm and a sun wheel;
the two ends of the planetary wheel shaft are respectively connected with the rotating arm, and the first planetary wheel, the second planetary wheel and the third planetary wheel are respectively connected with the planetary wheel shaft;
the first annular gear is in meshed connection with the first planet gears; the second annular gear is connected with the second planet gears in an inner meshed manner; the third annular gear is connected with the third planet gear in a meshed manner; and the second planet wheel is connected with the sun wheel in an external meshed mode.
Further, the motor further comprises a rotor shaft, and the sun gear is fixedly connected with the rotor shaft; the two ends of the rotor shaft are respectively connected with the inner cavity wall and the first annular gear through bearings, and the rotor shaft extends out of the inner cavity wall to be connected with a rotor of the motor.
Further, the integrated box comprises an output half shaft, wherein the output half shaft is connected with the front end cover of the integrated box body through a bearing; one end of the output half shaft is fixedly connected with the first annular gear, and the other end of the output half shaft is fixedly connected with the hub.
Further, the braking device comprises a left braking caliper body, a left braking cylinder piston, a left braking friction block, a right braking cylinder piston, a right braking caliper body, a braking protection plate, a braking disc and a braking disc connecting piece;
the braking protection plate is connected with the integrated box body; the left brake caliper body and the right brake caliper body are respectively connected with the brake protection plate;
the left brake cylinder piston is connected with the left brake caliper body, the left brake friction block is connected with the left brake cylinder piston, and the left brake friction block reciprocates under the action of the left brake piston;
the right brake cylinder piston is connected with the right brake caliper body, the right brake friction block is connected with the right brake cylinder piston, and the right brake friction block reciprocates under the action of the right brake piston;
the brake disc is positioned between the left brake friction block and the right brake friction block to form clearance fit connection;
the brake disc is connected with the output half shaft through a brake disc connecting piece.
Further, the I gear shifting device and the II gear shifting device have the same structure, and the I gear shifting device or the II gear shifting device comprises a shifting gear, a shifting shaft, a shifting disc, a left cylinder piston, a left clamp body, a protection plate, a left friction block, a right clamp body, a right cylinder piston and a right friction block;
the left clamp body and the right clamp body are respectively connected with the protection plate;
the left cylinder piston is connected with the left clamp body, the left friction block is connected with the left cylinder piston, and the left friction block reciprocates under the action of the left cylinder piston;
the right cylinder piston is connected with the right clamp body, the right friction block is connected with the right cylinder piston, and the right friction block reciprocates under the action of the right cylinder piston;
the gear shifting disc is positioned between the left friction block and the right friction block to form clearance fit connection;
the gear shifting disc is connected with one end of a gear shifting shaft, the other end of the gear shifting shaft is connected with a gear shifting gear, and the gear shifting shaft is connected with the integrated box body through a bearing.
Further, teeth are further arranged on the outer side of the second annular gear; the I gear shifting device is connected with the second annular gear in an external meshing manner through a shifting gear of the I gear shifting device.
Further, teeth are further arranged on the outer side of the third inner gear ring; and the II gear shifting device is connected with the third inner gear ring in an external meshing manner through a gear shifting gear of the II gear shifting device.
By adopting the technical scheme, the technical characteristics of the tire, the hub, the braking device, the I gear shifting device, the II gear shifting device, the planetary gear transmission device, the motor, the integrated box body and the like are used. The integrated box body is arranged in an inner cavity of the hub, and comprises an inner cavity for arranging the planetary gear transmission device and an outer cavity for arranging the motor; and the inner cavity of the integrated box body is arranged in the rotor of the cavity. And the front ends of the brake device, the I gear shifting device and the II gear shifting device, which are arranged on the outer side of the integrated box body, are connected with the planetary gear transmission device, so that the invention realizes the unpowered interruption-free I gear, II gear and neutral gear switching. The invention adopts the variable speed star gear device of the single sun gear triple planetary gear, greatly reduces the problems of high linear speed and oil stirring loss of the primary gear pair, simultaneously greatly reduces the volume and weight of the motor, and greatly expands the high-efficiency operation interval of the actual equivalent motor due to the adoption of the large-speed-ratio two-speed variable speed transmission structure. The adopted dry disc external braking gear shifting device realizes the characteristics of no obstacle, no power interruption gear shifting, heat and dust generation in the gear shifting process, extremely small neutral gear belt resistance, low cost and the like. The invention has the advantages of large I gear speed ratio and II gear speed ratio, high transmission efficiency, compact structure, full brake structure, small volume, light weight, high reliability, low cost and the like, and is suitable for various electric driving wheel assemblies for vehicles.
Drawings
FIG. 1 is a schematic view in front cross-section of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention rotated 90 degrees.
Description of the embodiments
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1 and 2, the two-gear automatic speed-changing electric driving wheel assembly comprises a tire 1, a hub 2, a braking device 3, an I gear shifting device 4, an II gear shifting device 5, a planetary gear transmission device, a motor 6 and an integrated box body 7; the integrated box 7 is arranged in the inner cavity of the hub 2. The motor 6 comprises a rotor 8 and a stator 9, and the integrated box 7 comprises an inner cavity 10 for mounting a planetary gear transmission device and an outer cavity 11 for mounting the motor 6. The stator 9 of the motor 6 is fixedly connected with the wall of the outer cavity 11 of the integrated box 7, the rotor 8 of the motor 6 is of a hollow structure, and the inner cavity 10 of the integrated box 7 is arranged in the cavity of the rotor 8. One end of the planetary gear transmission device is connected with a rotor 8, and the rotor 8 of the motor 6 realizes power output to the planetary gear transmission device; the other end of the planetary gear is connected with the hub 2, and the planetary gear realizes power output to the hub 2. The planetary gear transmission device is also connected with a braking device 3; the outer sides of the front end covers of the integrated box body 7 are respectively and uniformly provided with an I gear shifting device 4 and an II gear shifting device 5 which are connected with a planetary gear transmission device. The running state of the planetary gear transmission is regulated through the I gear shifting device 4 and the II gear shifting device 5, so that the planetary gear transmission realizes I gear output, II gear output or neutral gear output. In the specific implementation, the two I-gear shifting devices 4 are axially symmetrically distributed on the outer side of the integrated box body 7 by the transmission center of the planetary gear transmission device to realize the control of I gear. The two II-gear shifting devices 5 are axially symmetrically distributed on the outer side of the integrated box body 7 by the transmission center of the planetary gear transmission device to realize the control of II gears.
Above-mentioned technical scheme installs integration box 7 in wheel hub 2, sets up integration box 7 into inner chamber 10 and outer chamber 11, installs planetary gear in the inner chamber 10 of integration box 7, installs the outer intracavity 11 of integration box with motor 6 to set up the inner chamber 10 of integration box 7 in the rotor 8 of motor 6 cavity, and install the front end in the integration box 7 outside respectively with arresting gear 3, I shelves gearshift 4, II shelves gearshift 5. Under the action of the planetary gear transmission device, the invention effectively reduces the loss in the transmission process and improves the transmission efficiency. Meanwhile, as the planetary gear transmission is sealed in the inner cavity 10 of the integrated box body 7, the running environment of the planetary gear transmission is not influenced by pollutants such as powder generated in the braking and transmission gear switching process, and the service life of the planetary gear transmission is not influenced. Meanwhile, the planetary gear transmission device has large I gear ratio and II gear ratio and high transmission efficiency; the invention has compact whole structure, full brake structure, small volume, light weight, high reliability and low cost.
More specifically, the planetary gear transmission device in the implementation includes a first annular gear 12, a second annular gear 13, a third annular gear 14, a first planetary gear 15, a second planetary gear 16, a third planetary gear 17, a planetary wheel shaft 18, a rotating arm 19 and a sun gear 20. The two ends of the planetary wheel shaft 18 are respectively connected with the rotating arm 19, and the first planetary wheel 15, the second planetary wheel 16 and the third planetary wheel 17 are respectively and fixedly connected with the planetary wheel shaft 18 at proper positions. The first annular gear 12 is in meshed connection with the first planet gears 15; the second annular gear 13 is in meshed connection with the second planet gears 16; the third annular gear 14 is in meshed connection with the third planet gears 17; the second planetary gears 16 are in external meshed connection with the sun gear 20.
The implementation further comprises a rotor shaft 21, and the sun gear 20 is fixedly connected with the rotor shaft 21; the two ends of the rotor shaft 21 are respectively connected with the wall of the inner cavity 10 and the first annular gear 12 through bearings, and the rotor shaft 21 extends out of the wall of the inner cavity 10 to be connected with the rotor 8 of the motor 6. The integrated box body 7 also comprises an output half shaft 22, wherein the output half shaft 22 is connected with the front end cover of the integrated box body 7 through a bearing; one end of the output half shaft 22 is fixedly connected with the first annular gear 12, and the other end of the output half shaft 22 is fixedly connected with the hub 2 through a flange.
The brake device 3 in the specific implementation comprises a left brake caliper body 23, a left brake cylinder piston 24, a left brake friction block 25, a right brake friction block 26, a right brake cylinder piston 27, a right brake caliper body 28, a brake protection plate 29, a brake disc 30 and a brake disc connecting piece 31. The brake protection plate 29 is connected with the integrated box body 7; the left caliper body 23 and the right caliper body 28 are connected to a brake shield plate 29, respectively. The left brake cylinder piston 24 is mounted on the left caliper body 23. The left brake friction block 25 is connected to the piston rod of the left brake cylinder piston 24, and the left brake friction block 25 is reciprocated by the left brake piston 24. The right brake cylinder piston 27 is connected with the right brake caliper body 28, the right brake friction block 26 is fixedly connected with a piston rod of the right brake cylinder piston 27, and the right brake friction block 26 reciprocates left under the action of the right brake piston 27. The brake disc 30 is arranged between the left brake friction block 25 and the right brake friction block 26 to form clearance fit connection; the brake disc 30 is connected to the output half shaft 22 by a brake disc connection 31.
In the implementation, the structure of the I-gear shifting device 4 is the same as that of the II-gear shifting device 5, and the I-gear shifting device 4 or the II-gear shifting device 5 comprises a gear 32, a gear shifting shaft 33, a gear shifting disc 34, a left cylinder piston 35, a left clamp body 36, a protection plate 37, a left friction block 38, a right clamp body 39, a right cylinder piston 40 and a right friction block 41. The left clamp body 36 and the right clamp body 39 are respectively connected with the protection plate 37; the left cylinder piston 35 is connected with the left clamp body 36, the left friction block 38 is connected with the left cylinder piston 35, and the left friction block 38 and the left cylinder piston 35 do reciprocating motion under the action of the left friction block and the left cylinder piston 35. The right cylinder piston 40 is connected with the right clamp body 39, the right friction block 41 is connected with the right cylinder piston 40, and the right friction block 41 and the right cylinder piston 40 reciprocate under the action of the right friction block and the right cylinder piston 40. The shift plate 34 is mounted between the left friction block 38 and the right friction block 41 to form clearance fit connection, the shift plate 34 is connected with one end of the shift shaft 33, the other end of the shift shaft 33 is connected with the shift gear 32, and the shift shaft 33 is connected with the integrated box 7 through a bearing.
Setting teeth on the outer side of the second annular gear 13; the I-stage shift device 4 is connected with the second ring gear 13 in an external engagement manner through a shift gear 32 of the I-stage shift device 4. The outer side of the third annular gear 14 is provided with teeth; the II shift device 5 is connected with the third ring gear 14 in an external engagement manner through a shift gear 32 of the II shift device 5.
The main control strategy and the working mode of the invention are as follows:
(1) I gear drive mode
When the whole vehicle requires lower vehicle speed and higher torque, the stator 9 of the motor 6 obtains electric energy from an energy storage source, the electric energy is converted into mechanical energy through the rotor 8 of the motor 6 and then is transmitted to the rotor shaft 21, the rotor shaft 21 transmits power to the sun gear 20, and the sun gear 20 transmits the power to the second planetary gear 16 through external engagement; the vehicle controller sends out a control instruction, and a high hydraulic medium enters into two sets of I-gear shifting devices 4 which are symmetrically arranged at the same time, namely, enters into a closed cavity formed by a left cylinder piston 35 of the I-gear shifting device 4, a left clamp body 36 of the I-gear shifting device 4, a right cylinder piston 40 of the I-gear shifting device 4 and a right clamp body 39 of the I-gear shifting device 4, and under the action of the high hydraulic medium, the left cylinder piston 35 of the I-gear shifting device 4 and the right cylinder piston 40 of the I-gear shifting device 4 respectively push a left friction block 38 of the I-gear shifting device 4 and a right friction block 41 of the I-gear shifting device 4 to press a shifting disc 34 of the I-gear shifting device 4; when the hydraulic medium in the closed cavity reaches the set pressure threshold value and the speed sensor of the I-gear disc detects that the rotating speed of the gear shifting disc 34 of the I-gear shifting device 4 is zero, the gear shifting disc 34 of the I-gear shifting device 4 is completely braked, and the electric driving wheel is in an I-gear driving mode. At the same time, the gear-II shifting device 5 remains free of high-pressure medium, i.e. the shift disc 34 of the gear-II shifting device 5 is in a free-running state. Since the shift disc 34 of the I-stage shift device 4 is in a braked state and, further, the shift gear 32 of the I-stage shift device 4 fixedly connected thereto is in a braked state, the second ring gear 13 engaged with the shift gear 32 of the I-stage shift device 4 is braked by the external teeth; in addition, the first planetary gear 15, the second planetary gear 16 and the third planetary gear 17 are fixedly connected and share the same planetary wheel shaft 18 to be mounted on the rotating arm 19, so that the second planetary gear 16 transmits power to the first annular gear 12 through the first planetary gear 15, the first annular gear 12 transmits power to the hub 2 through the output half shaft 22, and the hub 2 drives the tyre 1 to drive the vehicle to run. At this time, since the shift plate 34 of the II shift device 5 is in a free rotation state, the shift gear 32 of the II shift device 5 fixedly connected to the shift plate 34 of the II shift device 5 is in a free rotation state, and further, the third ring gear 14 is freely rotated by the third planetary gear 17. In the I-range mode, the rotational speed relationship between the rotor shaft 21 of the two-range automatic transmission electric drive wheel assembly and the hub 2:
wherein: z1 represents the number of teeth of the sun gear 20, Z2 represents the number of teeth of the inner teeth of the first ring gear 12, Z3 represents the number of teeth of the inner teeth of the second ring gear 13, Z4 represents the number of teeth of the third ring gear 14, Z5 represents the number of teeth of the first planetary gear 15, Z6 represents the number of teeth of the second planetary gear 16, Z7 represents the number of teeth of the third planetary gear 17, n1 represents the rotational speed of the rotor shaft 21, and n2 represents the rotational speed of the hub 2.
(2) II drive mode
When the whole vehicle requires higher vehicle speed and lower torque, the stator 9 of the motor 6 obtains electric energy from an energy storage source, the electric energy is converted into mechanical energy through the rotor 8 of the motor 6 and then is transmitted to the rotor shaft 21, the rotor shaft 21 transmits power to the sun gear 20, and the sun gear 20 transmits the power to the second planetary gear 16 through external engagement; the vehicle controller sends out a control instruction, and a high hydraulic medium enters into two sets of II gear shifting devices 5 which are symmetrically arranged at the same time, namely, enters into a closed cavity formed by a left cylinder piston 35 of the II gear shifting device 5, a left clamp body 36 of the II gear shifting device 5, a right cylinder piston 40 of the II gear shifting device 5 and a right clamp body 39 of the II gear shifting device 5, and under the action of the high hydraulic medium, the left cylinder piston 35 of the II gear shifting device 5 and the right cylinder piston 40 of the II gear shifting device 5 respectively push a left friction block 38 of the II gear shifting device 5 and a right friction block 41 of the II gear shifting device 5 to press a shifting disc 34 of the II gear shifting device 5; when the hydraulic medium in the closed cavity reaches the set pressure threshold value and the speed sensor of the gear-II disc detects that the rotating speed of the gear-II shifting disc 34 of the gear-II shifting device 5 is zero, the gear-II shifting disc 34 of the gear-II shifting device 5 is completely braked, and the electric driving wheel is in a gear-II driving mode. At the same time, the I-range shift device remains free of high-pressure medium, i.e. the shift disc 34 of the I-range shift device 4 is in a free-running state. Since the shift disc 34 of the II shift device 5 is in a braked state and, further, the shift gear 32 of the II shift device 5 fixedly connected thereto is in a braked state, the shift gear 32 of the II shift device 5 is braked by the third ring gear 14 engaged with the external teeth; in addition, the first planetary gear 15, the second planetary gear 16 and the third planetary gear 17 are fixedly connected and share the same planetary gear shaft to be mounted on the rotating arm 19, so that power is transmitted to the first annular gear 12 through the first planetary gear 15, the first annular gear 12 transmits the power to the hub 2 through the output half shaft 22, and the hub 2 drives the tyre 1 to drive the vehicle to run. At this time, since the shift plate 34 of the I-stage shift device 4 is in a free rotation state, the shift gear 32 of the I-stage shift device 4 fixedly connected to the shift plate 34 of the I-stage shift device 4 is in a free rotation state, and further, the second ring gear 13 is freely rotated by the second planetary gear 16. In the II-gear mode, the rotational speed relationship between the rotor shaft 21 of the two-gear automatic transmission electric drive wheel assembly and the hub 2:
(3) Neutral mode
When the whole vehicle needs to cut off the connection of the tyre 1 and the rotor 8 of the motor 6, the whole vehicle controller sends out a control instruction, and the I-gear shifting device 4 keeps no high hydraulic medium entering, namely the shifting disc 34 of the I-gear shifting device 4 is in a free rotation state. At the same time, the gear-II shifting device 5 remains free of high-pressure medium, i.e. the shift disc 34 of the gear-II shifting device 5 is in a free-running state. Therefore, the shift gear 32 of the I-stage shift device 4 and the shift gear 32 of the II-stage shift device 5 are in a free rotation state, and further, the second ring gear 13 and the third ring gear 14 are in a free rotation state; at this time, the hub 2 and the sun gear 20 are in the power interruption mode, and further, the hub 2 and the motor rotor shaft 21 are in the power interruption mode, and the electric drive wheel is in the neutral mode.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.

Claims (5)

1. The two-gear automatic speed change electric driving wheel assembly is characterized by comprising a tire, a hub, a braking device, an I gear shifting device, an II gear shifting device, a planetary gear transmission device, a motor and an integrated box body; the integrated box body is arranged in the inner cavity of the hub;
the motor comprises a rotor and a stator, and the integrated box body comprises an inner cavity for installing the planetary gear transmission device and an outer cavity for installing the motor;
the stator is fixedly connected with the outer cavity wall of the integrated box body, the rotor is of a hollow structure, and the inner cavity of the integrated box body is arranged in the rotor cavity;
one end of the planetary gear transmission device is connected with the rotor, and the motor rotor realizes power output to the planetary gear transmission device; the other end of the planetary gear transmission device is connected with the hub, and the planetary gear transmission device realizes power output to the hub;
the planetary gear transmission device is also connected with a braking device; the outer side of the front end cover of the integrated box body is uniformly provided with an I gear shifting device and an II gear shifting device which are connected with a planetary gear transmission device respectively;
the I gear shifting device and the II gear shifting device are used for adjusting the running state of the planetary gear transmission device to enable the planetary gear transmission device to realize I gear output, II gear output or neutral gear output;
the planetary gear transmission device comprises a first annular gear, a second annular gear, a third annular gear, a first planet wheel, a second planet wheel, a third planet wheel, a planet wheel shaft, a rotating arm and a sun wheel;
the two ends of the planetary wheel shaft are respectively connected with the rotating arm, and the first planetary wheel, the second planetary wheel and the third planetary wheel are respectively connected with the planetary wheel shaft;
the first annular gear is in meshed connection with the first planet gears; the second annular gear is connected with the second planet gears in an inner meshed manner; the third annular gear is connected with the third planet wheel in an inner meshed manner; the second planet wheel is in external meshed connection with the sun wheel;
teeth are further arranged on the outer side of the second inner gear ring; the I gear shifting device is in external meshed connection with the second annular gear through a shifting gear of the I gear shifting device, and teeth are further arranged on the outer side of the third annular gear; and the II gear shifting device is connected with the third inner gear ring in an external meshing manner through a gear shifting gear of the II gear shifting device.
2. The two speed automatic transmission electric drive wheel assembly of claim 1, further comprising a rotor shaft, wherein the sun gear is fixedly connected with the rotor shaft; the two ends of the rotor shaft are respectively connected with the inner cavity wall and the first annular gear through bearings, and the rotor shaft extends out of the inner cavity wall to be connected with a rotor of the motor.
3. The two-speed automatic transmission electric drive wheel assembly of claim 2, further comprising an output half shaft connected to the integrated case front end cover by a bearing; one end of the output half shaft is fixedly connected with the first annular gear, and the other end of the output half shaft is fixedly connected with the hub.
4. The two-speed automatic transmission electric drive wheel assembly of claim 3, wherein the brake device comprises a left brake caliper body, a left brake cylinder piston, a left brake friction block, a right brake cylinder piston, a right brake caliper body, a brake guard plate, a brake disc, and a brake disc connector;
the braking protection plate is connected with the integrated box body; the left brake caliper body and the right brake caliper body are respectively connected with the brake protection plate;
the left brake cylinder piston is connected with the left brake caliper body, the left brake friction block is connected with the left brake cylinder piston, and the left brake friction block reciprocates under the action of the left brake piston;
the right brake cylinder piston is connected with the right brake caliper body, the right brake friction block is connected with the right brake cylinder piston, and the right brake friction block reciprocates under the action of the right brake piston;
the brake disc is positioned between the left brake friction block and the right brake friction block to form clearance fit connection;
the brake disc is connected with the output half shaft through a brake disc connecting piece.
5. The two-gear automatic transmission electric drive wheel assembly according to claim 4, wherein the I-gear shifting device has the same structure as the II-gear shifting device, and the I-gear shifting device or the II-gear shifting device comprises a gear shifting gear, a gear shifting shaft, a gear shifting disc, a left cylinder piston, a left clamp body, a protection plate, a left friction block, a right clamp body, a right cylinder piston and a right friction block;
the left clamp body and the right clamp body are respectively connected with the protection plate;
the left cylinder piston is connected with the left clamp body, the left friction block is connected with the left cylinder piston, and the left friction block reciprocates under the action of the left cylinder piston;
the right cylinder piston is connected with the right clamp body, the right friction block is connected with the right cylinder piston, and the right friction block reciprocates under the action of the right cylinder piston;
the gear shifting disc is positioned between the left friction block and the right friction block to form clearance fit connection;
the gear shifting disc is connected with one end of a gear shifting shaft, the other end of the gear shifting shaft is connected with a gear shifting gear, and the gear shifting shaft is connected with the integrated box body through a bearing.
CN201710807608.9A 2017-09-08 2017-09-08 Two-gear automatic speed-changing electric driving wheel assembly Active CN109469714B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN201710807608.9A CN109469714B (en) 2017-09-08 2017-09-08 Two-gear automatic speed-changing electric driving wheel assembly
US16/033,222 US10851881B2 (en) 2017-09-08 2018-07-12 Four-speed transaxle for electric vehicle
EP19193979.2A EP3591261B1 (en) 2017-09-08 2018-07-19 Four-speed transaxle for high efficiency electric vehicle
EP18184329.3A EP3502512B1 (en) 2017-09-08 2018-07-19 Four-speed transaxle for electric vehicle
KR1020180091382A KR101982799B1 (en) 2017-09-08 2018-08-06 Four-speed transaxle for electric vehicle
JP2018153481A JP6462174B1 (en) 2017-09-08 2018-08-17 4-speed transaxle for electric vehicles

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Publication number Priority date Publication date Assignee Title
WO2022155459A1 (en) * 2021-01-14 2022-07-21 Electric Propulsion Technologies, LLC Lubricant supported electric motor assembly for compact, power dense wheel-end applications
CN113733894B (en) * 2021-10-13 2023-07-04 山东科技大学 Two keep off variable speed electric wheel

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CN105387156A (en) * 2015-12-09 2016-03-09 中国北方车辆研究所 Electrically-driven automatic two-gear transmission
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CN207406721U (en) * 2017-09-08 2018-05-25 广州市新域动力技术有限公司 Two-shift automatic variable speed electric driving wheel assembly

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Publication number Priority date Publication date Assignee Title
CN104139830A (en) * 2013-05-06 2014-11-12 罗伯特·博世有限公司 Switching assembly for an electrically operated bicycle and bicycle
DE102015218252A1 (en) * 2015-09-23 2017-03-23 Schaeffler Technologies AG & Co. KG Two-speed gearbox for a vehicle, powertrain for the vehicle and method for shifting
CN105387156A (en) * 2015-12-09 2016-03-09 中国北方车辆研究所 Electrically-driven automatic two-gear transmission
CN207406721U (en) * 2017-09-08 2018-05-25 广州市新域动力技术有限公司 Two-shift automatic variable speed electric driving wheel assembly

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