CN116552236A - Power transmission device for in-wheel motor driving unit - Google Patents

Power transmission device for in-wheel motor driving unit Download PDF

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Publication number
CN116552236A
CN116552236A CN202310421503.5A CN202310421503A CN116552236A CN 116552236 A CN116552236 A CN 116552236A CN 202310421503 A CN202310421503 A CN 202310421503A CN 116552236 A CN116552236 A CN 116552236A
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CN
China
Prior art keywords
shaft
main shaft
power transmission
transmission shaft
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202310421503.5A
Other languages
Chinese (zh)
Other versions
CN116552236B (en
Inventor
张宁
李子鸿
李普
章恒亮
吴中泽
花为
张建润
孙蓓蓓
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Southeast University
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Southeast University
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Publication date
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Priority to CN202310421503.5A priority Critical patent/CN116552236B/en
Publication of CN116552236A publication Critical patent/CN116552236A/en
Application granted granted Critical
Publication of CN116552236B publication Critical patent/CN116552236B/en
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Classifications

    • 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
    • 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
    • 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
    • B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
    • B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
    • 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
    • B60K17/22—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/062—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels acting on transmission parts
    • 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
    • F16H57/04—Features relating to lubrication or cooling or heating
    • 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
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0469—Bearings or seals
    • F16H57/0471—Bearing
    • 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
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0479—Gears or bearings on planet carriers
    • 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
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0482—Gearings with gears having orbital motion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

The invention relates to the technical field of electromechanical transmission, in particular to a power transmission device for an in-wheel motor driving unit. The power transmission device comprises a lock nut, a shaft sleeve, a bearing spacer, a transmission shaft and a main shaft, wherein a ball bearing, a large bearing spacer and a tapered roller bearing are sequentially sleeved on the main shaft, the transmission shaft is connected with the main shaft through a spiral groove, a small bearing spacer, a tapered roller bearing and the shaft sleeve are sequentially sleeved on the main shaft through spacers, the lock nut is connected with the end part of the main shaft through threads, one side of the transmission shaft is connected with a hub motor rotor hub through a bolt, the other side of the transmission shaft is connected with a brake disc through a bolt, and the end part of the transmission shaft is connected with a sun gear of a planetary reducer through a spline. The design has compact structure, high transmission efficiency and high reliability.

Description

Power transmission device for in-wheel motor driving unit
Technical Field
The invention relates to the technical field of electromechanical transmission, in particular to a power transmission device for an in-wheel motor driving unit.
Background
With the rapid development of new energy automobiles, the electric wheel technology also rapidly develops, but a plurality of technical bottlenecks are still not broken through. In terms of the driving mode of the electric wheel, the driving mode of the electric wheel is mainly in hub motor driving. The hub motor driving device can be directly arranged in a cavity formed by the rim of the electric wheel, so that the axial space occupied by the motor is greatly reduced, the installation of a vehicle steering system and a suspension system is facilitated, and the vehicle performance is indirectly optimized; from the whole vehicle structure, the hub motor can replace a plurality of transmission devices such as an engine, a transmission shaft, a speed reducer and the like on the traditional vehicle, greatly simplify the chassis structure of the vehicle, improve the transmission efficiency and play a role in saving energy to a certain extent.
Because of the limited space in the wheel, and the need to meet the requirements for integrating in-wheel hub motors, brakes, and reducers, the design of the power transmission components is extremely important. The power transmission component with excellent performance is used for realizing the connection and interruption of power and meeting the driving and braking requirements of the hub motor driving assembly, but for the hub motor driving assembly, the motor assembly, the speed reducer and the brake are taken as main working components to occupy most of space in a wheel, so that the characteristics of compact structure and high integration level are required to be considered, and the power transmission device is specially designed.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a power transmission device for a hub motor driving unit, which aims to overcome the defects and problems of low power response speed and complex structure of the hub motor driving unit in the prior art.
The technical scheme includes that the power transmission device for the hub motor driving unit comprises a lock nut, a shaft sleeve, a first tapered roller bearing, a first bearing spacer, a second tapered roller bearing, a transmission shaft, a third tapered roller bearing, a second bearing spacer, a ball bearing and a main shaft, wherein an external thread is arranged at one end of the main shaft, and a first step, a second step and a third step are sequentially arranged at one side of the main shaft opposite to the external thread; a first bulge is arranged at one end of the main shaft far away from the external thread;
the transmission shaft is provided with an external spline, a fourth step, a second bulge, a spiral groove, a second through hole, a hollow shaft, a cylindrical bolt hole and a conical bolt hole;
the transmission shaft is arranged on the main shaft, and in a driving mode, the transmission shaft is connected with the motor rotor hub through a bolt; in a braking mode, the transmission shaft is connected with the brake disc;
the external spline is matched with the internal spline of the sun gear of the planetary reducer;
the fourth step is sleeved on the outer ring of the third tapered roller bearing and the ball bearing;
the ball bearing, the second bearing spacer bush and the third tapered roller bearing are sequentially sleeved on the second step of the main shaft at intervals; the transmission shaft is connected with a first step of the main shaft through a spiral groove, the first bearing spacer, the first tapered roller bearing and the shaft sleeve are sequentially sleeved on the first step of the main shaft at intervals, and the locking nut is connected with the end part of the main shaft through threads.
Preferably, the drive shaft is engaged with the motor rotor hub by bolts through the cylindrical bolt holes.
Preferably, the drive shaft is coupled to the brake disc by bolts through the conical bolt holes.
The first bearing spacer is provided with a first through hole which is distributed on the outer ring of the first bearing spacer;
the second bearing spacer is provided with a first through hole which is the same as the first bearing spacer.
The first boss of the spindle is provided with a bolt hole for connecting an external device.
And a third through hole is formed in the second step of the main shaft.
In a driving mode, the transmission shaft is connected with the motor rotor hub through bolts, and driving torque is transmitted to an external spline of the transmission shaft from the hub motor; the external spline of the transmission shaft is meshed with the internal spline of the sun gear of the planetary reducer, and driving torque is transmitted to the wheel end of the vehicle through the planetary reducer to drive the vehicle to run;
in a braking mode, a brake disc is contacted with and tightly pressed on a transmission shaft, braking torque is transmitted to a cylindrical bolt hole of the transmission shaft, and a rotor hub of a braking motor is used for energy recovery; the braking torque is transmitted to the external spline of the transmission shaft, the external spline of the transmission shaft is meshed with the internal spline of the sun gear of the planetary reducer, and the braking torque is transmitted to the wheel end of the vehicle through the planetary reducer to brake the vehicle.
Compared with the prior art, the invention has the following beneficial technical effects:
1. according to the power transmission device for the hub motor driving unit, the spline is designed at the joint of the transmission shaft, so that the transmission shaft can be in spline matching with the internal spline of the sun gear of the planetary reducer, and the torque balance load of each planetary gear in the planetary reducer is realized by utilizing the characteristic that the spline connection can float in the radial direction. Therefore, the invention has the advantages of small power transmission vibration, stable work and high reliability.
2. In the power transmission device for the hub motor driving unit, by designing the spiral groove in the transmission shaft, lubricating oil is pressed into the hollow shaft of the input shaft by relative rotation with the main shaft in the running process of the transmission shaft, so that the third tapered roller bearing and the ball bearing are lubricated; meanwhile, through designing the second through hole on the step of the input shaft, the first through hole on the spacer bush of the first bearing and the third through hole on the step of the main shaft, the sun gear of the planetary reducer, the third tapered roller bearing on the main shaft and the ball bearing can be lubricated by the lubricating oil. Therefore, the invention has good lubrication effect and high working efficiency in the power transmission process.
3. In the power transmission device for the hub motor driving unit, the cylindrical bolt hole and the conical bolt hole of the transmission shaft are designed, so that the transmission shaft can be connected with the hub of the hub motor rotor and the brake disc, torque transfer with good uniform load characteristic can be realized, and energy recovery in the braking process can be realized. Therefore, the power transmission and energy recovery functions of the invention are simple to realize and have compact structure.
Drawings
Fig. 1 is a schematic structural view of a power transmission device for an in-wheel motor driving unit in the present invention;
fig. 2 is an exploded schematic view of a power transmission device for an in-wheel motor driving unit in the present invention;
FIG. 3 is a schematic cross-sectional view of a first bearing spacer of the power transmission device for an in-wheel motor drive unit of the present invention;
FIG. 4 is a schematic cross-sectional view of a drive shaft of a power transmission device for an in-wheel motor drive unit in accordance with the present invention;
fig. 5 is a schematic cross-sectional view of a main shaft of a power transmission device for an in-wheel motor driving unit in the present invention;
fig. 6 is a transmission schematic diagram of a power transmission device for an in-wheel motor driving unit in the present invention.
Reference numerals: 1. a lock nut; 2. a shaft sleeve; 3. a first tapered roller bearing; 4. a first bearing spacer; 4-1, a first through hole; 5. a second tapered roller bearing; 6. a transmission shaft; 6-1, external splines; 6-2, a fourth step; 6-3, a second bulge; 6-4, spiral grooves; 6-5, a second through hole; 6-6, hollow shaft; 6-7, a cylindrical bolt hole; 6-8, conical bolt holes; 7. a third tapered roller bearing; 8. a second bearing spacer; 9. a ball bearing; 10. a main shaft; 10-1, external threads; 10-2, a first step; 10-3, a second step; 10-4, a third step; 10-5, a first bulge; 10-6, a third through hole; 10-7, bolt holes; 11. a planet wheel; 12. a sun gear; 13. a hub motor; 14. a brake disc; 15. a planet carrier; 16. and a gear ring.
Detailed Description
Example 1
The invention provides a power transmission device for a hub motor driving unit, which is shown in fig. 1 to 4, and comprises a lock nut 1, a shaft sleeve 2, a first tapered roller bearing 3, a first bearing spacer 4, a second tapered roller bearing 5, a transmission shaft 6, a third tapered roller bearing 7, a second bearing spacer 8, a ball bearing 9 and a main shaft 10, wherein one end of the main shaft 10 is provided with an external thread 10-1, and one side of the main shaft 10 opposite to the external thread 10-1 is sequentially provided with a first step 10-2, a second step 10-3 and a third step 10-4; the end of the main shaft 10, which is far away from the external thread 10-1, is provided with a first bulge 10-5;
the transmission shaft 6 is provided with an external spline 6-1, a fourth step 6-2, a second protrusion 6-3, a spiral groove 6-4, a second through hole 6-5, a hollow shaft 6-6, a cylindrical bolt hole 6-7 and a conical bolt hole 6-8;
the transmission shaft 6 is arranged on the main shaft 10, and in a driving mode, the transmission shaft 6 is connected with a motor rotor hub through bolts; in braking mode, the drive shaft 6 is connected to the brake disc 14;
the external spline 6-1 is matched with the internal spline of the sun gear 12 of the planetary reducer;
the fourth step 6-2 is sleeved on the outer rings of the third tapered roller bearing 7 and the ball bearing 9;
the ball bearing 9, the second bearing spacer 8 and the third tapered roller bearing 7 are sequentially sleeved on the second step 10-3 of the main shaft 10 at intervals; the transmission shaft 6 is connected with a first step 10-2 of the main shaft 10 through a spiral groove 6-4, a first bearing spacer 4, a first tapered roller bearing 3 and a shaft sleeve 2 are sequentially sleeved on the first step 10-2 of the main shaft 10 at intervals, and a locking nut 1 is connected with the end part of the main shaft 10 through threads.
The drive shaft 6 is engaged with the motor rotor hub by bolts through the cylindrical bolt holes 6-7.
The drive shaft 6 is coupled to the brake disc by bolts through the conical bolt holes 6-8.
The first bearing spacer 4 is provided with a first through hole 4-1, and the first through hole 4-1 is distributed on the outer ring of the first bearing spacer 4;
the second bearing spacer 8 is provided with a first through hole 4-1 identical to the first bearing spacer 4.
The first boss 10-5 of the main shaft 10 is provided with a bolt hole 10-7 for connecting an external device.
The second step 10-3 of the spindle 10 is provided with a third through hole 10-6.
The power transmission path of the power transmission device will be described below.
The planet wheel 11, the sun wheel 12, the planet carrier 15 and the ring gear 16 constitute a planetary reducer module of the in-wheel motor drive assembly, and the planetary reducer module, the in-wheel motor 13 and the brake disc 14 are not parts protected by property rights in the present invention, but are only auxiliary parts for explaining the power transmission path.
In the driving mode, the transmission shaft 6 is connected with a motor rotor hub through bolts, and driving torque is transmitted to an external spline 6-1 of the transmission shaft 6 from the hub motor 13; the external spline 6-1 of the transmission shaft 6 is meshed with the internal spline of the sun gear 12 of the planetary reducer, and the driving torque is transmitted to the wheel end of the vehicle through the planetary reducer to drive the vehicle to run;
in a braking mode, the brake disc 14 is contacted and pressed with the transmission shaft 6, braking torque is transmitted to the position of a cylindrical bolt hole 6-7 of the transmission shaft 6, and the rotor hub of the braking motor is used for energy recovery; the braking torque is transmitted to the external spline 6-1 of the transmission shaft 6, the external spline 6-1 of the transmission shaft 6 is meshed with the internal spline of the sun gear 12 of the planetary reducer, and the braking torque is transmitted to the wheel end of the vehicle through the planetary reducer to brake the vehicle.
The working principle of the invention is as follows: in the driving mode, the power of the automobile is driven by the rotor hub of the hub motor 13, sequentially passes through the transmission shaft 6, the sun gear 12 and the planet gears 11, and finally is transmitted to the wheels by the planet carrier 15 of the planetary reducer; in the braking mode, the braking force is derived from the friction force between the brake disc 14 and the transmission shaft 6, the braking force is transmitted to the wheels through the transmission shaft 6, the sun gear 12 and the planet gears 11, and finally, the planet carrier 15 of the planetary reducer transmits the braking force to the wheels to realize vehicle braking, and meanwhile, the braking force is transmitted to the rotor hub of the hub motor 13 through the transmission shaft 6 to realize energy recovery.
Finally, analyzing the internal stress condition of the power transmission device, wherein the longitudinal force, the transverse force and the vertical force from the ground borne by the wheels are transmitted to the transmission shaft 6 and the main shaft 10 through the first tapered roller bearing 3 and the second tapered roller bearing 5, and the force on the transmission shaft 6 can be directly transmitted to the main shaft 10 through the third tapered roller bearing 7 and the ball bearing 9; the bending moment transmitted from the wheel is mainly borne by the main shaft 10.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (9)

1. The utility model provides a power transmission device for in-wheel motor drive unit, includes lock nut (1), axle sleeve (2), first tapered roller bearing (3), first bearing spacer (4), second tapered roller bearing (5), transmission shaft (6), third tapered roller bearing (7), second bearing spacer (8), ball bearing (9) and main shaft (10), its characterized in that: one end of the main shaft (10) is provided with an external thread (10-1), and one side of the main shaft (10) opposite to the external thread (10-1) is sequentially provided with a first step (10-2), a second step (10-3) and a third step (10-4); one end of the main shaft (10) far away from the external thread (10-1) is provided with a first bulge (10-5);
the transmission shaft (6) is provided with an external spline (6-1), a fourth step (6-2), a second bulge (6-3), a spiral groove (6-4), a second through hole (6-5), a hollow shaft (6-6), a cylindrical bolt hole (6-7) and a conical bolt hole (6-8);
the transmission shaft (6) is arranged on the main shaft (10), and the transmission shaft (6) is connected with the motor rotor hub through bolts, so that power transmission in a driving mode is realized; the transmission shaft (6) is connected with the brake disc (14) through bolts, so that power transmission in a braking mode is realized;
the external spline (6-1) is matched with the internal spline of the sun gear (12) of the planetary reducer;
the fourth step (6-2) is sleeved on the outer rings of the third tapered roller bearing (7) and the ball bearing (9);
the ball bearing (9), the second bearing spacer bush (8) and the third tapered roller bearing (7) are sequentially sleeved on the second step (10-3) of the main shaft (10) at intervals; the transmission shaft (6) is connected with a first step (10-2) of the main shaft (10) through a spiral groove (6-4), a first bearing spacer (4), a first tapered roller bearing (3) and a shaft sleeve (2) are sequentially sleeved on the first step (10-2) of the main shaft (10) at intervals, and a lock nut (1) is connected with the end part of the main shaft (10) through threads.
2. A power transmission device for an in-wheel motor drive unit according to claim 1, characterized in that: the drive shaft (6) is engaged with the motor rotor hub by bolts through the cylindrical bolt holes (6-7).
3. A power transmission device for an in-wheel motor drive unit according to claim 1, characterized in that: the transmission shaft (6) is combined with the brake disc through the conical bolt hole (6-8) by bolts.
4. A power transmission device for an in-wheel motor drive unit according to claim 1, characterized in that: the first bearing spacer (4) is provided with a first through hole (4-1), and the first through hole (4-1) is distributed on the outer ring of the first bearing spacer (4).
5. A power transmission device for an in-wheel motor drive unit according to claim 4, characterized in that: the second bearing spacer (8) is provided with a first through hole (4-1) which is the same as the first bearing spacer (4).
6. A power transmission device for an in-wheel motor drive unit according to claim 1, characterized in that: the first protrusion (10-5) of the main shaft (10) is provided with a bolt hole (10-7) for connecting an external device.
7. A power transmission device for an in-wheel motor drive unit according to claim 1, characterized in that: the second step (10-3) of the main shaft (10) is provided with a third through hole (10-6).
8. A power transmission device for an in-wheel motor drive unit according to claim 1, characterized in that:
in a driving mode, the transmission shaft (6) is connected with the motor rotor hub through bolts, and driving torque is transmitted to an external spline (6-1) of the transmission shaft (6) from the hub motor (13); the external spline (6-1) of the transmission shaft (6) is meshed with the internal spline of the sun gear (12) of the planetary reducer, and driving torque is transmitted to the wheel end of the vehicle through the planetary reducer to drive the vehicle to run.
9. A power transmission device for an in-wheel motor drive unit according to claim 1, characterized in that:
in a braking mode, a brake disc (14) is contacted with and pressed against a transmission shaft (6), braking torque is transmitted to a cylindrical bolt hole (6-7) of the transmission shaft (6), and a rotor hub of a braking motor is used for energy recovery; the braking torque is transmitted to the external spline (6-1) of the transmission shaft (6), the external spline (6-1) of the transmission shaft (6) is meshed with the internal spline of the sun gear (12) of the planetary reducer, and the braking torque is transmitted to the wheel end of the vehicle through the planetary reducer to brake the vehicle.
CN202310421503.5A 2023-04-19 2023-04-19 Power transmission device for in-wheel motor driving unit Active CN116552236B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105774526A (en) * 2016-04-27 2016-07-20 吉林大学 Wheel hub motor device capable of outputting high torque and automobile
CN107901751A (en) * 2017-11-16 2018-04-13 武汉理工大学 Electric automobile coaxial-type In-wheel motor driving system synthesis integral structure
CN110154737A (en) * 2019-05-31 2019-08-23 吉林大学 A kind of electronic wheel apparatus of low-speed big and electric car
CN210502248U (en) * 2019-06-27 2020-05-12 吉林大学 Low-speed large-torque electric wheel device and electric vehicle
CN115388163A (en) * 2022-06-16 2022-11-25 长沙汽车创新研究院 Take single reduction gear's in-wheel motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105774526A (en) * 2016-04-27 2016-07-20 吉林大学 Wheel hub motor device capable of outputting high torque and automobile
CN107901751A (en) * 2017-11-16 2018-04-13 武汉理工大学 Electric automobile coaxial-type In-wheel motor driving system synthesis integral structure
CN110154737A (en) * 2019-05-31 2019-08-23 吉林大学 A kind of electronic wheel apparatus of low-speed big and electric car
CN210502248U (en) * 2019-06-27 2020-05-12 吉林大学 Low-speed large-torque electric wheel device and electric vehicle
CN115388163A (en) * 2022-06-16 2022-11-25 长沙汽车创新研究院 Take single reduction gear's in-wheel motor

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