CN117774559A - Wheel side electric drive system capable of sensing load in real time and load sensing method - Google Patents
Wheel side electric drive system capable of sensing load in real time and load sensing method Download PDFInfo
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Abstract
The invention relates to a wheel side electric drive system capable of sensing load in real time and a load sensing method, wherein the system comprises a wheel assembly, a driving motor, a braking system and an integrated shell; the six-component sensor of the wheel assembly, the wheel center connecting shaft and the standard rim of the passenger car are sequentially connected through the hub connecting piece; the six-component sensor is fixedly connected with the gear ring flange connecting disc; the load signal acquisition module is fixedly connected with the six-component sensor; the load signal transmission module is fixedly connected to the main shell; the six-component sensor is communicated with the load signal acquisition module, and the load signal acquisition module is communicated with the load signal transmission module. Compared with the prior art, the invention has the functions of a driving unit and a sensing unit; the double-row tapered roller bearing is adopted, so that the double-row tapered roller bearing is suitable for bearing heavy load and impact load; the integrated design has lubricated oil collecting groove and the oil duct characteristic of relevant position, has improved the lubricated effect of core transmission element, has reduced unordered advantage such as splashing of fluid in the stirring oil process.
Description
Technical Field
The invention relates to a wheel-side electric drive system, in particular to a wheel-side electric drive system capable of sensing load in real time and a load sensing method.
Background
In recent years, with the rapid development of electric automobiles, the evolution iteration of an electric drive system also reaches a deeper technical connotation: not only the requirements of high rotating speed and high torque required by the traditional power assembly are met, but also the requirements of higher level are provided in the aspects of modularization, intelligence, functional integration and the like. In a traditional centralized driving electric automobile, a set of electric driving system is used as a centralized power source, and the power of a motor is distributed through a transmission part to drive the wheels to rotate. And the distributed driving electric automobile is provided with a set of electric driving system for each wheel, so that the driving state of each wheel can be independently controlled, the quick response of the execution unit is realized, and the finer and intelligent control of the automobile is further supported.
Furthermore, the distributed electric drive system is also an ideal information sensing unit. The load between the wheels and the road generates a large amount of information when the vehicle is traveling on the road, and is of great value for both condition monitoring and travel control of the vehicle. Setting corresponding sensors on the distributed electric drive system, and transmitting the obtained signals and the whole vehicle controller in real time so as to obtain the required load information; the load information is brought into an algorithm model of the whole vehicle controller, so that perception and prejudgment of potential risks can be realized, and the running stability of the distributed driving vehicle is improved.
Since the installation location of the distributed electric drive system is in or beside the wheels of the vehicle, its space is very limited. To realize the electric wheel with driving and sensing functions, a compact configuration scheme, an electromechanical integrated design, high integration of components and parts and full utilization of space orientation are required. At present, distributed electric drive is deeply studied at home and abroad; some researches are also carried out on the load sensing of the wheel force, but the wheel-mounted measuring device is usually considered as a detecting instrument and is used for teaching test in the vehicle research and development process and data acquisition in road engineering test. Therefore, on the basis of the existing research, the distributed wheel electric driving system capable of sensing the load state in real time is further integrated and upgraded, so that the sensing information source of the vehicle during running can be increased, and the intelligent degree of the vehicle is improved.
Through retrieval, application publication number CN114407645a discloses a wheel side reduction driving system using idler transmission, specifically discloses: the system comprises a disc brake, a driving motor, a hub bearing, an idler gear reducer, a rim and a hub, wherein the idler gear reducer is arranged between the driving motor and the hub, power is transmitted from the driving motor to the idler gear reducer, and is output to the hub after being subjected to speed reduction and torque increase, so that the wheels are driven to rotate.
However, this prior art patent does not have a function of sensing the wheel load state in real time. Therefore, how to sense the wheel load state in real time and increase the sensing information source when the vehicle is running becomes a technical problem to be solved.
Disclosure of Invention
The invention aims to overcome the defect that the load state of a vehicle cannot be sensed in real time in the prior art, and provides a wheel side electric drive system capable of sensing the load in real time and a load sensing method.
The aim of the invention can be achieved by the following technical scheme:
according to one aspect of the present invention, there is provided a wheel-side electric drive system capable of sensing load in real time, comprising a wheel assembly, a brake system, a drive motor and an integrated housing; the wheel assembly comprises a standard rim of a passenger car, a hub connecting piece and a wheel center connecting shaft; the integrated shell comprises a main shell, a gear ring flange connection disc and a gear ring;
the integrated shell is characterized by further comprising a six-component sensor, a six-component sensor locking piece, a load signal acquisition module and a load signal transmission module;
the six-component sensor, the wheel center connecting shaft and the standard rim of the passenger car are sequentially connected through the hub connecting piece; the six-component sensor is fixedly connected with the gear ring flange connecting disc through a six-component sensor locking piece; the ring gear flange is fixedly connected with the ring gear; the load signal acquisition module is fixedly connected with the six-component sensor; the load signal transmission module is fixedly connected to the main shell; the six-component sensor is communicated with the load signal acquisition module, and the load signal acquisition module is communicated with the load signal transmission module.
As a preferable technical scheme, the main shell is internally filled with lubricating oil, the integrated shell further comprises a lubricating oil collecting groove, a gear ring and a bearing cover plate, and the lubricating oil collecting groove is an arc-shaped V-shaped deep groove and is fixedly connected to the load signal transmission module; the lubricating oil is splashed after being stirred by the gear ring, falls into a lubricating oil collecting groove, and flows into the double-row tapered roller bearing through the bearing cover plate after being collected.
As the preferable technical scheme, the double-row tapered roller bearing is provided with a bearing ring groove and a bearing oil port, the bearing cover plate is provided with a guide oil duct, lubricating oil in the guide oil duct flows into the bearing ring groove, and after the radial direction of the bearing ring groove is filled with the lubricating oil, the lubricating oil flows into the bearing oil port.
As the preferable technical scheme, the driving motor comprises a motor rotor shaft, a motor end cover and a motor gear, wherein the motor gear is pressed on the motor rotor shaft through a hot jacket process, and the motor end cover is arranged on the end face of the main shell through bolts.
As the preferable technical scheme, the integrated shell also comprises a wheel end cover shell and a wheel end sealing ring, wherein the wheel end cover shell is arranged on the main shell and is provided with a reinforcing rib and a cover shell axial positioning plate, and the cover shell axial positioning plate and the wheel end sealing ring are arranged in a matched mode.
As a preferred solution, the integrated housing further comprises a housing protection cover, and the housing protection cover is mounted on the main housing.
As an optimized technical scheme, the integrated shell further comprises an idler wheel, an idler wheel shaft, an idler wheel bearing, an idler wheel shaft locking bolt, a bearing cover plate and a bearing cover plate bolt, wherein the idler wheel is arranged on the idler wheel shaft through the idler wheel bearing, and the idler wheel shaft is fixedly connected in the main shell through the idler wheel shaft locking bolt; the bearing cover plate is fixedly connected to the bearing seat of the main shell through a bearing cover plate bolt.
As a preferable technical scheme, the braking system comprises a braking disc, a braking caliper, a braking disc locking nut, a braking mounting bracket and a bracket bolt, and the driving motor comprises a motor rotor shaft and a motor end cover; the brake disc is fixedly connected with the motor rotor shaft through a spline and is screwed through a brake disc locking nut; the brake calipers and the brake mounting bracket are fixedly arranged in the motor end cover through bracket bolts in a screwing mode.
According to another aspect of the present invention, there is provided a load sensing method using a wheel side electric driving system capable of sensing a load in real time, the method further using a vehicle controller, comprising the steps of:
step S1, when a wheel assembly rotates, a driving motor drives a gear ring flange connecting disc to rotate;
s2, a six-component sensor collects six-component electric signals of the load and transmits the six-component electric signals to a load signal collection module;
step S3, the load signal acquisition module transmits signals to the load signal transmission module;
and S4, the load signal transmission module processes the load signal and transmits the processed load signal to the whole vehicle controller.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention provides a technical scheme of a wheel electric driving system, which has the functions of a driving unit and a sensing unit, skillfully utilizes the power output of an idler gear ring, and fixedly connects a six-component sensor and a load signal acquisition module with the idler gear ring through an integrated design, so that the power output, the load monitoring and the electric signal transmission are synchronously realized;
2) According to the invention, when power is output, the six-component sensor is used for continuously monitoring the wheel load, the load signal acquisition module and the load signal transmission module are used for preprocessing the collected electric signals and transmitting the preprocessed electric signals to the whole vehicle controller, so that real-time load sensing of the vehicle is realized;
3) The double-row tapered roller bearing is adopted, can bear radial load and bidirectional axial load, and is suitable for bearing heavy load and impact load;
4) According to the invention, the space of the idler wheel device is fully utilized, the load signal transmission module is arranged on the main shell, so that the lubrication oil collecting groove and the oil duct characteristics at the corresponding position are integrally designed, the directional flow of oil is realized, the lubrication effect of the core transmission element is improved, and the unordered splashing of the oil in the oil stirring process is reduced;
5) The invention adopts an idler gear speed reduction type transmission configuration, and can realize larger transmission ratio in a limited space, thereby leading the motor torque to obtain strong torque output after speed reduction and torque increase.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a wheel-side electric drive system load capable of sensing the load in real time;
FIG. 2 is a schematic diagram of a load coordinate system of a wheel-side electric drive system capable of sensing load in real time;
FIG. 3 is a cross-sectional view of a drive motor of the present invention;
FIG. 4 is a cross-sectional view of the wheel assembly of the present invention;
FIG. 5 is a schematic illustration of the installation of the braking system of the present invention;
FIG. 6 is a schematic diagram of a transmission mechanism according to the present invention;
FIG. 7 is a schematic diagram of a lubrication circuit according to the present invention;
FIG. 8 is a diagram of oil hole features of a bearing cover plate of the present invention;
FIG. 9 is a view showing an oil hole characteristic structure of the double row tapered roller bearing of the present invention;
FIG. 10 is a schematic view of the installation of the load sensing mechanism of the present invention;
FIG. 11 is a schematic diagram of the installation of a load signal transmission module of the present invention;
FIG. 12 is a schematic view of the main housing structure of the present invention;
FIG. 13 is a schematic view of the wheel end housing structure of the present invention;
the reference numerals in fig. 1 indicate:
1. the wheel assembly, 2, driving motor, 3, braking system, 4, integrated shell;
the reference numerals in fig. 3 indicate:
1-1, a tire, 1-2, a standard rim of a passenger car, 1-6, a wheel center connecting shaft, 1-7, a double-row tapered roller bearing, 1-8, a clamp spring, 2-1, a motor rotor shaft, 2-2, a motor rotary transformer, 2-3, a motor end cover, 2-4, a motor bearing, 2-5, a motor rotor lock nut, 2-6, a motor rotor, 2-7, a motor stator, 2-8, a motor seal ring, 2-9, a motor shaft sleeve, 2-10, a motor seal gear, 3-1, a brake disc lock nut, 3-2, a brake disc, 3-3, a brake mounting bracket, 3-4, a brake caliper, 4-1, a main housing, 4-3, a refueling screw plug, 4-5, a housing bolt, 4-6, a wheel end housing, 4-7, a wheel end seal ring, 4-8, a bearing cover plate, 4-9, a six-component sensor, 4-11, a load signal acquisition module, 4-12, a flange, 4-13, a gear ring, a protection cover, 4-21, a load signal transmission protection cover, 4-22, a protection cover, 4-24, a lubrication module, and a lubrication module, a bolt, and a connection disc, respectively;
the reference numerals in fig. 4 indicate:
1-3 parts of hub bolts, 1-4 parts of hub nuts, 1-5 parts of rim Logo cover plates;
the reference numerals in fig. 5 indicate:
3-5, a bracket bolt;
the reference numerals in fig. 6 indicate:
2-10 parts of motor dense gears, 4-10 parts of six-component sensor locking bolts, 4-15 parts of idler wheels, 4-16 parts of idler wheel shafts, 4-19 parts of idler wheel shaft locking bolts;
the reference numerals in fig. 7 indicate:
4-17 parts of idler wheel bearings, 4-18 parts of idler wheel snap springs, 4-23 parts of screws;
the reference numerals in fig. 8 indicate:
4-8-1 parts of bearing cover plate inner aperture, 4-8-2 parts of bearing cover plate axial baffle, 4-8-3 parts of bearing cover plate inner hole installation guide chamfer angles, 4-8-4 parts of bearing cover plate installation holes, 4-8-5 parts of bearing cover plate oil guide grooves, 4-8-6 parts of bearing cover plate reinforcing ribs;
the reference numerals in fig. 9 indicate:
1-7-1 parts of a bearing oil port, 1-7-2 parts of a bearing ring groove;
the reference numerals in fig. 10 indicate:
4-9-1, a sensor-bolt mounting through hole, 4-11-1, a module-bolt mounting through hole, 4-12-1, a flange-sensor mounting through hole, 4-12-2, a flange-module mounting threaded hole, 4-13-1, a gear ring excircle, 4-13-2, a gear ring-flange mounting threaded hole, 4-14 and a gear ring locking bolt;
the reference numerals in fig. 12 indicate:
4-1-1, a shell-vent plug installation threaded hole, 4-1-2, a shell-refueling screw plug installation threaded hole, 4-1-3, a reinforcing rib, 4-1-4, a shell-shield installation threaded hole, 4-1-5, a shell-shock absorption installation interface, 4-4 and a screw plug gasket;
the reference numerals in fig. 13 indicate:
4-6-1, an inner aperture of a wheel end cover shell, 4-6-2, a cover shell axial positioning plate, 4-6-3, a reinforcing rib, 4-6-4 and a cover shell bolt mounting seat.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The invention provides a wheel-side electric driving system capable of sensing load in real time, which adopts a distributed driving mode, namely each wheel is controlled and driven by an independent wheel-side electric driving system respectively. The invention has the functions of the driving unit and the sensing unit, continuously monitors the wheel load through the sensor while outputting power, and pre-processes the collected electric signals and transmits the electric signals to the whole vehicle controller, thereby realizing real-time load sensing of the vehicle.
As shown in fig. 1, the present invention is composed of four sub-assembly systems, respectively: a braking system 3, a wheel assembly 1, a drive motor 2, and an integrated housing 4.
As shown in fig. 2, the load coordinates of the sensor are defined as follows: the x-axis is the direction of travel of the vehicle, the y-axis is the transverse direction of the vehicle, and the z-axis is the direction perpendicular to the road surface. Correspondingly, the wheel load is resolved in the coordinate system into six components, in particular longitudinallyForce F x Longitudinal moment M x (also called tipping moment), transverse force F y Transverse moment M y (also called rolling moment), vertical force F z Vertical moment (also called aligning moment M z )。
As shown in fig. 3, the drive motor 2 includes: the motor comprises a motor rotor shaft 2-1, a motor rotary transformer 2-2, a motor end cover 2-3, a motor bearing 2-4, a motor rotor lock nut 2-5, a motor rotor 2-6, a motor stator 2-7, a motor sealing ring 2-8, a motor shaft sleeve 2-9 and a motor gear. Wherein the motor end cap 2-3 is mounted to an end face of the main casing 4-1 by bolts. The motor rotary transformer 2-2 is arranged on the motor end cover 2-3 and is used for providing characteristic signals required by motor control. The motor shaft sleeve 2-9 is fixedly connected with the motor rotor shaft 2-1 through interference fit after press fitting, the outer circle of the motor shaft sleeve 2-9 has the technical requirements of form and position tolerance such as roughness, coaxiality and the like, and the characteristics are matched with the motor sealing ring 2-8 for use, so that isolation and sealing are realized. The motor rotor 2-6 is fixedly connected with the motor rotor shaft 2-1 by tightening the motor rotor locking nut 2-5. The motor stator 2-7 is mounted on the inner wall of the main casing 4-1 and fixedly coupled thereto. The motor gear is fixedly connected with the motor rotor shaft 2-1 through interference fit after press fitting. Preferably, the motor gear is subjected to a shrink fit process during press fitting to increase its interference with the motor rotor shaft 2-1, thereby achieving a higher torque transmission capability.
The integrated housing 4 includes: the device comprises a main shell 4-1, a ventilation plug, an oiling screw plug 4-3, a screw plug gasket 4-4, a shell bolt 4-5, a wheel end shell 4-6, a wheel end sealing ring 4-7, a bearing cover plate 4-8, a six-component sensor 4-9, a six-component sensor locking bolt 4-10, a load signal acquisition module 4-11, a gear ring flange connecting disc 4-12, a gear ring 4-13, a gear ring locking bolt 4-14, an idler wheel 4-15, an idler wheel shaft 4-16, an idler wheel bearing 4-17, an idler wheel clamp spring 4-18, an idler wheel shaft locking bolt 4-19, a bearing cover plate 4-8 bolt, a load signal transmission module 4-21, a lubricating oil collecting groove 4-22, a bolt 4-23, a shell protecting cover 4-24 and a protecting cover bolt 4-25. The six-component sensor 4-9 is an industrial sensor, in which components in the three coordinate axis directions and moments about the three axes can be measured simultaneously by defining a coordinate system. The elastic body of the six-component sensor 4-9 is provided with groups of strain gauges, the elastic body deforms under the action of load, the strain gauges generate corresponding resistance changes, and then the values are read through the voltage difference of the bridge circuit. The upper end of the main shell 4-1 is provided with a ventilation plug which plays a role in keeping the air pressure in the cavity; simultaneously, a filling screw plug 4-3 and a screw plug gasket 4-4 are arranged for filling lubricating oil, and the sealing and leakage preventing are realized after the filling screw plug is screwed. The wheel end housing 4-6 is screwed to the mounting surface of the main housing 4-1 by housing bolts 4-5. The wheel end sealing ring 4-7 is arranged in the mounting hole of the wheel end housing 4-6, the lip of the wheel end sealing ring 4-7 is matched with the outer circle of the wheel center connecting shaft 1-6, and the outer circle has the technical requirements of form and position tolerance such as roughness, coaxiality and the like, so that isolation and sealing are realized. The six-component sensor 4-9 is fixedly connected with the gear ring flange connection disc 4-12 through the screwing of the six-component sensor locking bolt 4-10. The load signal acquisition module 4-11 is mounted on and fixedly connected with the six-component sensor 4-9 through screws 4-23. The gear ring flange connection disc 4-12 is fixedly connected with the gear ring 4-13 through the screwing of the gear ring locking bolt 4-14. The gear ring 4-13 and the idler gear 4-15 realize transmission in an internal engagement mode. The idler wheel 4-15 is arranged on the idler wheel shaft 4-16 through an idler wheel bearing 4-17, and is axially positioned by an idler wheel snap spring 4-18. The idler wheels 4-15 and the motor gear realize transmission in an external meshing mode. The idler shaft 4-16 is fixedly connected to the idler shaft 4-15 mounting hole of the main shell 4-1 through an idler shaft locking bolt 4-19. The bearing cover plate 4-8 is screwed and fastened on the bearing seat of the main shell 4-1 through bolts of the bearing cover plate 4-8. The load signal transmission module 4-21 is fixedly connected to the module mounting hole of the main housing 4-1 by a screw 4-23. The lubricating oil collecting groove 4-22 is fixedly connected with the mounting hole of the load signal transmission module 4-21 through a screw 4-23.
As shown in fig. 4, the wheel assembly 1 includes: the tire comprises a tire 1-1, a standard rim 1-2 of a passenger car, a hub bolt 1-3, a hub nut 1-4, a rim Logo cover plate 1-5, a wheel center connecting shaft 1-6, a double-row tapered roller bearing 1-7 and a clamp spring 1-8. The tire 1-1 is mounted on a standard rim 1-2 of the passenger car, mounting holes are formed in the standard rim 1-2 of the passenger car, a hub bolt 1-3 penetrates through a six-component sensor 4-9 and a wheel center connecting shaft 1-6, and then penetrates through the mounting holes of the standard rim 1-2 of the passenger car to be screwed with a hub nut 1-4, so that the six-component sensor 4-9, the wheel center connecting shaft 1-6 and the standard rim 1-2 of the passenger car are fixedly connected. The double-row tapered roller bearing 1-7 is fixedly connected with the wheel center connecting shaft 1-6 through interference fit after press fitting, and the bearing inner ring is axially positioned through the clamp spring 1-8. The Logo cover plate 1-5 is arranged at the wheel center, can prevent dust and splash sand and stone impact, and has attractive visual effect.
As shown in fig. 5, the brake system 3 includes: a brake disc 3-2, a brake caliper 3-4, a brake disc locking nut 3-1, a brake mounting bracket 3-3 and a bracket bolt 3-5. The brake calipers 3-4 and the brake mounting bracket 3-3 are screwed up through bracket bolts 3-5 and fixedly connected with the motor end cover 2-3 of the integrated shell 4, the brake disc 3-2 is fixedly connected with the motor rotor shaft 2-1 of the driving motor 2 through splines, and the brake disc locking nuts 3-1 are screwed up to realize axial positioning and prevent loosening. When the vehicle brakes, the brake calipers 3-4 act, the clamping brake disc 3-2 applies braking torque, the braking torque is further transmitted to the motor rotor shaft 2-1, and the transmission mechanism transmits the braking torque to the wheel assembly 1, so that the braking of the wheel end is finally realized.
As shown in fig. 6, a motor rotor 2-6 of the drive motor 2 is screwed and fastened to a motor rotor shaft 2-1 by a motor rotor lock nut 2-5. When the vehicle runs, the output power is driven by the motor rotor shaft 2-1 through the motor gear to drive the idler gear 4-15, then the idler gear 4-15 is used for driving the gear ring 4-13, the gear ring 4-13 and the gear ring flange connecting disc 4-12 are fixedly connected through the gear ring locking bolt 4-14, the gear ring flange connecting disc 4-12 is fixedly connected with the six-component sensor 4-9 through the six-component sensor locking bolt 4-10, and the six-component sensor 4-9 is simultaneously and fixedly connected with the wheel center connecting shaft 1-6 and the standard rim 1-2 of the passenger vehicle through the hub bolt 1-3. This achieves a transmission path of the driving torque from the motor to the wheel end. Preferably, idler wheels 4-15 are respectively arranged on the left side and the right side of the motor gear, so that the uniform load of the transmission system can be improved, and the transmission is more stable.
As shown in fig. 7, the motor gears and idler gears 4-15 are all partially submerged in lubricating oil, the oil position being shown in plan view. As shown by arrow direction in the figure, when the vehicle runs, the motor gear drives the idler wheel 4-15 and the gear ring 4-13 to rotate, the lubricating oil at the bottom is stirred to the top end under the driving of the gear ring 4-13, and then the oil splashes under the action of gravity and centrifugal force. The lubricating oil collecting groove 4-22 is characterized by an arc-shaped V-shaped deep groove, splashed oil falls to the lubricating oil collecting groove 4-22 and flows to the bottom of the V-shaped deep groove along the side wall, after the oil at the groove bottom is collected, the oil flows into an oil passage at the bottom of the lubricating oil collecting groove 4-22, flows into a guide oil passage of the bearing cover plate 4-8, and finally enters the double-row tapered roller bearing 1-7. The design of the lubricating oil way fully utilizes the gear oil stirring function of the wheel-side electric drive system during operation, collects oil through the lubricating oil collecting grooves 4-22, realizes the directional flow of the oil through the design of the characteristics of the oil grooves, the guide oil ducts and the like, ensures that the key element double-row tapered roller bearings 1-7 are lubricated in a targeted manner, improves the lubricating effect of the core transmission element, and reduces unordered splashing of the oil in the oil stirring process.
As shown in FIG. 8, the diameter of the inner aperture 4-8-1 of the bearing cover plate has the technical requirements of geometric tolerances such as roughness, coaxiality and the like, and the characteristics are matched with the double-row tapered roller bearing 1-7 to ensure the stable running and longer service life of the bearing. The axial baffle plate 4-8-2 of the bearing cover plate and the double-row tapered roller bearing 1-7 are axially provided with clearance, so that an axial protection function is realized on the basis of ensuring the running of the bearing, and the bearing is prevented from moving and falling off under the action of axial force. The guide chamfer 4-8-3 is arranged in the inner hole of the bearing cover plate and used for guiding when the double-row tapered roller bearing 1-7 is arranged, so that extrusion or clamping stagnation between inner walls is prevented from affecting the installation process. The bearing cover plate mounting holes 4-8-4 are used for penetrating through bolts of the bearing cover plate 4-8 and screwing and fixing the bolts on bearing seat bolt holes of the main shell 4-1 during mounting. The bearing cover plate oil guiding groove 4-8-5 is used for receiving the lubricating oil flowing out of the lubricating oil collecting groove 4-22 and enabling the lubricating oil to flow into the inner aperture 4-8-1 of the bearing cover plate. And the bearing cover plate reinforcing ribs 4-8-6 are used for improving the rigidity and strength of the bearing cover plate wall plate, so that the bearing cover plate wall plate can meet the requirements of bearing fit while being compact and weight-reducing.
As shown in fig. 9, the bearing ring groove 1-7-2 is used for receiving the lubricating oil flowing out of the oil guiding groove 4-8-5 of the bearing cover plate, and the lubricating oil flows into the bearing oil port 1-7-1 after being filled in the radial direction, so that the double-row tapered roller bearing 1-7 is lubricated.
As shown in fig. 10, when the vehicle is running, the drive motor 2 outputs power by the motor rotor shaft 2-1 through the motor gear driving the idler gear 4-15, and then drives the ring gear 4-13 to rotate through the idler gear 4-15. The gear ring 4-13 is fixedly connected with the gear ring flange connecting disc 4-12 through the gear ring locking bolts 4-14, and 8 gear ring locking bolts 4-14 are uniformly distributed along the circumferential direction so as to ensure uniform load and stable connection. The ring gear 4-13 is provided with corresponding 8 threaded holes for tightening the ring gear lock bolts 4-14. The end face of the gear ring flange connecting disc 4-12 is provided with 8 corresponding flange-sensor mounting through holes 4-12-1 which are countersunk through holes, so that screw heads do not interfere with the axial direction after tightening. The gear ring flange connecting disc 4-12 is fixedly connected with the six-component sensor 4-9 through six-component sensor locking bolts 4-10, and 16 six-component sensor locking bolts 4-10 are uniformly distributed along the circumferential direction so as to ensure uniform load and stable connection. The ring gear flange connection disc 4-12 is provided with 16 corresponding threaded holes for tightening the six-component sensor lock bolt 4-10. The outer ring of the six-component sensor 4-9 is provided with 16 corresponding sensor-bolt mounting through holes 4-9-1 which are countersunk through holes, so that the screw heads do not interfere with the axial direction after being screwed. The six-component sensor 4-9 is fixedly connected with the wheel center connecting shaft 1-6 and the standard rim 1-2 of the passenger car through the hub bolts 1-3, and is fastened through the hub nuts 1-4. The hub bolts 1-3 are uniformly distributed with 4 in the circumferential direction to ensure uniform load and stable connection, and the six-component sensor 4-9 is ensured to be arranged at the space position of the wheel center, so that the initial error caused by the deviation of the physical position and the origin of the coordinate system is avoided. This achieves a transmission path of the output torque from the motor to the wheel end. In the power transmission process, the six-component sensor 4-9 has a load sensing function, so that six-component real-time detection is realized, and specifically longitudinal force, longitudinal moment (also called overturning moment), transverse force, transverse moment (also called rolling moment), vertical force and vertical moment (also called aligning moment). The measured six-component load electric signal is transmitted to the load signal acquisition module 4-11, and is converted through the amplifying circuit, and the load signal acquisition module 4-11 is provided with Bluetooth communication equipment for short-distance wireless load signal transmission.
As shown in fig. 11, the load signal transmission module 4-21 is mounted to the corresponding position of the main casing 4-1 by a screw 4-23. The lubrication sump 4-22 is mounted to the corresponding location of the load signal transmission module 4-21 by means of screws 4-23. The load signal transmission module 4-21 is provided with Bluetooth communication equipment and is used for receiving wireless signals sent by Bluetooth of the load signal acquisition module 4-11 to obtain real-time load information. The physical distance between the load signal acquisition module 4-11 and the load signal acquisition transmission block is not more than 0.1m, so that the stability of Bluetooth signals and the speed of data transmission are ensured. The load signal transmission module 4-21 is internally provided with a PCB and a memory chip, has the functions of data caching, filtering noise reduction and other signal preprocessing, and the processed load signal can be directly read, used, calculated and stored and transmitted to the whole vehicle controller.
As shown in fig. 12, the vent plug is mounted to the end surface of the main housing 4-1 through the characteristic housing-vent plug mounting screw hole 4-1, and functions to maintain the air pressure in the cavity. The refueling screw plug 4-3 and the screw plug gasket 4-4 are installed on the end face of the main shell 4-1 through the characteristic shell-refueling screw plug installation threaded hole 4-1-2 for filling lubricating oil, and are sealed and leak-proof after being screwed. The reinforcing ribs 4-1-3 are used for improving the rigidity and strength of the wall plate of the main shell 4-1, so that the wall plate is compact and weight-reducing, and meanwhile, the requirements for mounting and matching of components can be met. The shell protection cover 4-24 is mounted to the corresponding position of the shell housing bolt hole through the protection cover bolt 4-25, and plays an additional role in strengthening and protecting the main shell 4-1, so that the shell is prevented from being damaged by impact of the road surface bouncing foreign matters in the driving process.
As shown in fig. 13, the diameter of the bore in the housing has the specifications of geometric tolerances such as roughness and coaxiality, and these features cooperate with the wheel end seal rings 4-7 to achieve isolation and sealing. The housing axial positioning plate 4-6-2 is used for axial positioning and mounting of the wheel end sealing ring 4-7. The reinforcing ribs 4-1-3 are used for improving the rigidity and strength of the wall plate of the wheel end cover shell 4-6, so that the requirements for installing and matching the sealing ring can be met while the weight is reduced compactly. The housing bolt mount 4-6-4 is provided with a threaded hole due to the bolt mounting and tightening positioning between the housing and the main housing 4-1.
The invention also provides a load sensing method, wherein the load signal transmission module 4-21 is communicated with the whole vehicle controller, and the steps are as follows:
1) When the wheel assembly 1 rotates, the driving motor 2 drives the gear ring flange connection disc 4-12 to rotate;
2) The six-component sensor 4-9 collects the six-component electric signal of the load and transmits the six-component electric signal to the load signal collection module 4-11;
3) The load signal acquisition module 4-11 transmits signals to the load signal transmission module 4-21 through Bluetooth communication equipment;
4) The load signal transmission module 4-21 processes the load signal and transmits the processed load signal to the whole vehicle controller.
The invention can provide the load information of the wheels, increases the perception information source (the existing perception information source for intelligent driving is usually camera image information and radar detection information) when the vehicle runs, and improves the intelligent degree of the vehicle.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A wheel side electric drive system capable of sensing load in real time comprises a wheel assembly (1), a driving motor (2), a braking system (3) and an integrated shell (4); the wheel assembly (1) comprises a standard rim (1-2) of the passenger car, a hub connecting piece and a wheel center connecting shaft (1-6); the integrated shell (4) comprises a main shell (4-1), a gear ring flange connection disc (4-12) and a gear ring (4-13);
the integrated wheel assembly is characterized in that the wheel assembly (1) further comprises a double-row tapered roller bearing (1-7), and the integrated shell (4) further comprises a six-component sensor (4-9), a six-component sensor locking piece, a load signal acquisition module (4-11) and a load signal transmission module (4-21);
the six-component sensor (4-9), the wheel center connecting shaft (1-6) and the standard rim (1-2) of the passenger car are sequentially connected through a hub connecting piece; the six-component sensor (4-9) is fixedly connected with the gear ring flange connecting disc (4-12) through a six-component sensor locking piece; the gear ring flange connecting disc (4-12) is fixedly connected with the gear ring (4-13); the load signal acquisition module (4-11) is fixedly connected with the six-component sensor (4-9); the load signal transmission module (4-21) is fixedly connected to the main shell (4-1); the six-component sensor (4-9) is communicated with the load signal acquisition module (4-11), and the load signal acquisition module (4-11) is communicated with the load signal transmission module (4-21).
2. The wheel side electric driving system capable of sensing load in real time according to claim 1, further comprising a bluetooth communication module, wherein the six-component sensor (4-9) is installed at the center of the wheel assembly (1), and the distance between the load signal acquisition module (4-11) and the load signal transmission module (4-21) is not more than 0.1m, and the communication is performed through the bluetooth communication module.
3. The wheel side electric drive system capable of sensing load in real time according to claim 1, wherein the main shell (4-1) is internally filled with lubricating oil, the integrated shell (4) further comprises a lubricating oil collecting groove (4-22), a gear ring (4-13) and a bearing cover plate (4-8), and the lubricating oil collecting groove (4-22) is an arc-shaped V-shaped deep groove and is fixedly connected to the load signal transmission module (4-21); the lubricating oil is splashed after being stirred by the gear ring (4-13), falls into a lubricating oil collecting groove (4-22), and flows into the double-row tapered roller bearing (1-7) through the bearing cover plate (4-8) after being collected.
4. A wheel side electric drive system capable of sensing load in real time according to claim 3, wherein the double-row tapered roller bearing (1-7) is provided with a bearing ring groove (1-7-2) and a bearing oil port (1-7-1), the bearing cover plate (4-8) is provided with a guide oil duct, lubricating oil in the guide oil duct flows into the bearing ring groove (1-7-2), and after the radial direction of the bearing ring groove (1-7-2) is filled with lubricating oil, the lubricating oil flows into the bearing oil port (1-7-1).
5. The wheel side electric drive system capable of sensing load in real time according to claim 1, wherein the driving motor (2) comprises a motor rotor shaft (2-1), a motor end cover (2-3) and a motor gear, the motor gear is pressed on the motor rotor shaft (2-1) through a hot jacket process, and the motor end cover (2-3) is mounted on the end face of the main shell (4-1) through bolts.
6. The wheel side electric drive system capable of sensing load in real time according to claim 1, wherein the integrated housing (4) further comprises a wheel end housing (4-6) and a wheel end sealing ring (4-7), the wheel end housing (4-6) is mounted on the main housing (4-1), a reinforcing rib (4-1-3) and a housing axial positioning plate (4-6-2) are arranged on the wheel end housing (4-6), and the housing axial positioning plate (4-6-2) and the wheel end sealing ring (4-7) are mounted in a matched mode.
7. A wheel-side electric drive system with real time load sensing according to claim 1, wherein the integrated housing (4) further comprises a housing protection cover (4-24), the housing protection cover (4-24) being mounted on the main housing (4-1).
8. The wheel side electric drive system capable of sensing load in real time according to claim 1, wherein the integrated housing (4) further comprises an idler wheel (4-15), an idler wheel shaft (4-16), an idler wheel bearing (4-17), an idler wheel shaft locking bolt (4-19), a bearing cover plate (4-8) and a bearing cover plate bolt, the idler wheel (4-15) is mounted on the idler wheel shaft (4-16) through the idler wheel bearing (4-17), and the idler wheel shaft (4-16) is fixedly connected in the main housing (4-1) through the idler wheel shaft locking bolt (4-19); the bearing cover plate (4-8) is fixedly connected to the bearing seat of the main shell (4-1) through a bearing cover plate bolt.
9. The wheel side electric drive system capable of sensing load in real time according to claim 1, wherein the brake system (3) comprises a brake disc (3-2), a brake caliper (3-4), a brake disc locking nut (3-1), a brake mounting bracket (3-3) and a bracket bolt (3-5), and the drive motor (2) comprises a motor rotor shaft (2-1) and a motor end cover (2-3); the brake disc (3-2) is fixedly connected with the motor rotor shaft (2-1) through a spline and is screwed by a brake disc locking nut (3-1); the brake calipers (3-4) and the brake mounting bracket (3-3) are fixedly arranged in the motor end cover (2-3) through bracket bolts (3-5) in a screwing mode.
10. The load sensing method of the wheel side electric drive system capable of sensing the load in real time by adopting the method of claim 1 is characterized by also adopting a whole vehicle controller, and specifically comprises the following steps:
step S1, when the wheel assembly (1) rotates, the driving motor (2) drives the gear ring flange connection disc (4-12) to rotate;
s2, a six-component sensor (4-9) collects six-component electric signals of a load and transmits the six-component electric signals to a load signal collection module (4-11);
s3, a load signal acquisition module (4-11) transmits signals to a load signal transmission module (4-21);
and S4, the load signal transmission module (4-21) processes the load signal and transmits the processed load signal to the whole vehicle controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311662741.1A CN117774559A (en) | 2023-12-06 | 2023-12-06 | Wheel side electric drive system capable of sensing load in real time and load sensing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311662741.1A CN117774559A (en) | 2023-12-06 | 2023-12-06 | Wheel side electric drive system capable of sensing load in real time and load sensing method |
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| CN117774559A true CN117774559A (en) | 2024-03-29 |
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| CN202311662741.1A Pending CN117774559A (en) | 2023-12-06 | 2023-12-06 | Wheel side electric drive system capable of sensing load in real time and load sensing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118386822A (en) * | 2024-06-26 | 2024-07-26 | 浙江创大汽车部件有限公司 | Hub electric drive device with adjustable double shaft heads |
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- 2023-12-06 CN CN202311662741.1A patent/CN117774559A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118386822A (en) * | 2024-06-26 | 2024-07-26 | 浙江创大汽车部件有限公司 | Hub electric drive device with adjustable double shaft heads |
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