CN111923718B - Wheel hub motor trailing arm suspension - Google Patents

Wheel hub motor trailing arm suspension Download PDF

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Publication number
CN111923718B
CN111923718B CN202010480587.6A CN202010480587A CN111923718B CN 111923718 B CN111923718 B CN 111923718B CN 202010480587 A CN202010480587 A CN 202010480587A CN 111923718 B CN111923718 B CN 111923718B
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trailing arm
vehicle
hydro
arm
mounting bracket
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CN111923718A (en
Inventor
赵松
赵艳辉
廖桐舟
施睿
赵春霞
马玉坡
杨志勇
闫智洲
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China North Vehicle Research Institute
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China North Vehicle Research Institute
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • 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
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/001—Suspension arms, e.g. constructional features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/0207—Wire harnesses
    • B60R16/0215—Protecting, fastening and routing means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
    • B60K2001/006—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric motors

Abstract

The invention belongs to the field of vehicle engineering, and provides a hub motor trailing arm suspension, which comprises a trailing arm mounting bracket, a trailing arm, a hub motor, a cable, a brake, a heat dissipation water pipe, a fastening screw rod and a spring connecting pin, wherein the trailing arm mounting bracket is provided with a threaded interface; a metal cover plate is welded at an opening of the trailing arm spring mounting side close to the trailing arm mounting bracket; the cover plate is provided with a round hole matched with the diameters of the heat dissipation water pipe and the cable; the interface of trailing arm and in-wheel motor is radiation flange structure. The structure integration of wheel hub motor, trailing arm support, cable line for suspension guiding mechanism and motor drive mechanism integration become the general interchange modularization part of vehicle.

Description

Wheel hub motor trailing arm suspension
Technical Field
The invention relates to a hub motor driving system of a light ultrahigh motor vehicle, belonging to the field of vehicle engineering.
Background
The single longitudinal arm in-wheel motor driving module in the prior art has a complex structure, is not light enough in weight, and simultaneously, the cable, the water pipe and the like are not integrated and ordered enough, so that the problems of abrasion of the cable and the water pipe and the like are easily caused, but the special road condition provides a brand-new requirement for the driving system of the light ultrahigh motor vehicle in running: super large suspension stroke; the vehicle posture adjusting function is achieved; the lateral rigidity is high; ultra-large driving torque output and the like, which cannot be met by the prior art. The invention with the application number of 201210323493.3 discloses a single trailing arm type independent suspension with a hydro-pneumatic spring, which is heavy in weight, large in size and insufficient in bearing capacity, cannot integrate structures of a hub motor, a trailing arm support and a cable pipeline in application, is insufficient in longitudinal flexibility, influences the capability of a vehicle passing through geometric obstacles, does not have reasonable design of the structure in the aspect of heat dissipation of the hub motor, and increases the difficulty of integration.
Disclosure of Invention
In order to solve the above-described technical problems, the inventors invented a trailing arm suspension for an in-wheel motor as follows.
The invention provides a wheel hub motor trailing arm suspension, which comprises a trailing arm mounting bracket, a trailing arm, a wheel hub motor, a cable, a brake, a heat dissipation water pipe, a fastening screw rod and a spring connecting pin, wherein the wheel hub motor is arranged on the trailing arm mounting bracket; a threaded interface is reserved on the longitudinal arm mounting bracket; the longitudinal arm is of a thin-wall structure, and the pin shaft end of the longitudinal arm is coupled with the longitudinal arm mounting bracket to form a rotating pair; the hub motor is arranged on the trailing arm interface through a fastening screw rod; the cable and the heat dissipation water pipe penetrate through the cavity of the trailing arm and are led out from the end of the trailing arm bracket; the motor heat dissipation water pipe and the cable are led in from an opening at the far end of the trailing arm and led out from an opening at the mounting side of the trailing arm spring, which is close to the trailing arm mounting bracket; the opening part of the longitudinal arm spring mounting side, which is close to the longitudinal arm mounting support, is welded with a metal cover plate, the cover plate is provided with a round hole matched with the diameters of the heat dissipation water pipe and the cable, and the interface of the longitudinal arm and the hub motor is of a radiation flange structure.
Preferably, the trailing arm mounting bracket is of a split mirror structure and comprises a main bracket and an auxiliary bracket, and the auxiliary bracket is positioned with the main bracket through a positioning groove and a flange plane.
Preferably, the thin-walled structure has a rectangular cross section.
Preferably, the brake is a fixed caliper disc brake which is driven by a hydraulic system to provide braking torque.
As a further preference, the brake is matched with a fixed caliper multi-piston integrated brake caliper.
Preferably, the opening of the trailing arm spring mounting side near the trailing arm mounting bracket faces upward.
Preferably, all cables of the motor of the wheel hub are uniformly distributed on one side of the trailing arm.
Preferably, the spring connecting pin shaft is connected with a lower dead point of the hydro-pneumatic spring.
A driving and driving control system of an unmanned vehicle hub motor comprises the suspension.
Preferably, the elastic force of the hydro-pneumatic spring is as follows:
Figure BDA0002517204300000021
wherein, the meaning of each parameter is as follows:
Fsrepresenting the elastic force of the hydro-pneumatic spring, and the unit is N;
Rgdenotes the gas constant, in units of J/(mol. k), preferably 8.314;
t represents the thermodynamic temperature in K;
mqthe unit of the mass of the gas in the hydro-pneumatic spring is Kg;
V0the initial volume of gas in the hydro-pneumatic spring is expressed in mm3；
DcThe diameter of the hydro-pneumatic spring piston is shown, and the unit is mm;
s represents the stroke of the hydro-pneumatic spring piston, and the unit is mm;
a represents a Van der Waals constant in atm. multidot.L2/mol2。
Compared with the prior art, the invention has the following beneficial effects:
(1) the structure integration of wheel hub motor, trailing arm support, cable line for suspension guiding mechanism and motor drive mechanism integration become the general interchange modularization part of vehicle.
(2) The trailing arm is thin wall cavity structural design, can hold motor power cable simultaneously, control cable, heat dissipation water pipe's intracavity integration.
(3) The hub motor and the longitudinal arm are mounted and characterized in that the heat dissipation water pipe is arranged at the inlet and the outlet of the heat dissipation water pipe, is arranged at the far end of the longitudinal arm along the axial direction of the longitudinal arm, and is used for reducing the water group of the heat dissipation water along the pipeline, indirectly reducing the lift and the power of a heat dissipation system, reducing the power loss and improving the energy utilization efficiency of the whole vehicle.
(4) The design of the cover plate round hole can enable the heat dissipation water pipe and the cable line to be stable and orderly, and the water pipe and the cable are compact.
(5) All cables of the motor of the wheel hub are uniformly distributed on one side of the longitudinal arm and point to the positive direction of the vertical direction of the vehicle body. The arrangement mode enables the pipeline to have good protection capability under the vehicle wading working condition and the off-road working condition, and the reliability and the safety of the system are improved.
(6) The structure of the trailing arm is optimized to realize the large-stroke jumping of the wheel; the wheel hop plane is parallel to the central plane of the vehicle body, so that the longitudinal flexibility of the suspension is increased, and the passing capacity of the geometric obstacles of the vehicle is greatly improved; the transverse rigidity of the suspension is increased, and the stability of the vehicle passing through the geometric obstacle is greatly improved.
(7) The hub driving module has the advantages that the parts are arranged and combined, so that the driving module parts suitable for different driving axles and different swing arm directions of the whole vehicle can be formed, the universal capability of the parts is greatly improved, and the requirement on the maintenance and guarantee capability of the system is reduced.
(8) A large amount of researches are carried out on the property selection of the hydro-pneumatic spring, the optimal property of the hydro-pneumatic spring is designed, and the ultrahigh passing performance of the vehicle is improved.
(9) According to the invention, through a large amount of research, the parameters are determined by the strategy adopted for the rear two-axle composite steering, so that the performance of the system is further improved.
Drawings
Fig. 1 shows a single trailing arm in-wheel motor drive module.
Fig. 2 shows a structure of the trailing arm mounting bracket.
FIG. 3 and FIG. 4 are longitudinal sectional views.
FIG. 5 is a schematic view of a travel drive steering system.
FIG. 6 is a schematic diagram of a hydro-pneumatic spring independent suspension system.
Fig. 7 is a schematic diagram of a hydro-pneumatic suspension hydraulic system.
Fig. 8 is a schematic diagram of the driving control structure of the present invention.
Fig. 9 is a schematic diagram of the differential matching relationship of the wheels.
The reference numbers are as follows: 20 cable lead-out end; 21 a heat dissipation water pipe leading-out end; 24. a cable; 25. a brake; 26 and 29 heat-dissipating water pipes; 27. fastening screw rods 28 and spring connecting pins; 1-1, a main bracket; 1-2, a secondary support; 1-3, fastening screws.
1-a tire and rim assembly, 2-a longitudinal arm, 3-a longitudinal arm mounting rack, 4-a hydro-pneumatic spring, 5-a steering gear, 6-a lower cross arm, 7-an upper cross arm, 8-a hub motor, 9-a steering pull rod, 10-a steering rocker arm, 11-a center pull rod and 12-a steering knuckle.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Fig. 1 and 2 show schematic diagrams (of a single trailing arm axle) of a single trailing arm in-wheel motor drive module. As shown in fig. 1 and 2, the present invention provides a single trailing arm in-wheel motor driving module, which comprises a trailing arm mounting bracket 3, a trailing arm 2, an in-wheel motor 8, a cable 24, a brake 25, heat dissipation water pipes 26 and 29, a fastening screw 27 and a connecting pin 28 of an oil-gas spring 4. The trailing arm mounting bracket 3 is provided with a threaded interface, so that the trailing arm mounting bracket is conveniently fixed on a vehicle body through bolts; the longitudinal arm 2 is of a thin-wall structure, the thickness of the preferable thin wall is 5mm, the pin shaft end of the longitudinal arm is coupled with the mounting bracket 3 to form a rotating pair, the longitudinal arm swings around a vehicle body, the cross section of the longitudinal arm 2 is preferably rectangular, the torsional rigidity of a component is increased, the weight of the component is reduced, the longitudinal arm 2 is preferably made of aluminum alloy materials, and the weight of the component is further reduced; the hub motor 8 is arranged on the trailing arm interface through a fastening screw 27, and the preferred mode of the trailing arm interface is a flange structure, so that the hub motor can be better fixed; the water inlet and outlet 21 of the motor heat dissipation water pipe 26 and 29 are arranged at the far end of the trailing arm 2, the cable leading-out port 20 is arranged at the spring mounting side of the trailing arm, the motor heat dissipation water pipe and the cable are led in from the opening at the far end of the trailing arm and led out from the openings 20 and 21 at the position, close to the spring mounting support of the trailing arm, of the spring mounting side of the trailing arm, so that the heat dissipation water pipe 26 and the cable 24 are integrated in a wiring harness mode, the cross-country state of a vehicle is prevented, and obstacles collide with the wiring harness.
Preferably, the cable leading-out end 20 and the heat dissipation water pipe leading-out end 21 are disposed between the connecting pin 28 and the trailing arm mounting bracket 3; further preferably, the cable outlet 20 is closer to the connection pin 28 than the heat radiation water pipe outlet 21. The above arrangement enables a more compact structure.
Preferably, all cables of the hub motor are uniformly distributed on one side of the trailing arm 2 and point to the right upper side of the vehicle body perpendicular to the ground. The muddy water pollution and the broken stone collision in the vehicle braking process can be avoided, the system fault rate is reduced, and the system reliability is improved.
Preferably, the trailing arm 2 is provided with a threaded interface, and a pipeline protective cover can be installed to protect the cable and the water pipe. The cable 24 and the heat dissipation water pipes 26 and 29 penetrate through the cavity of the longitudinal arm and are led out from the other end (bracket end) of the longitudinal arm, so that the integration of the pipeline and the longitudinal arm is realized, and the bending and abrasion of the pipeline caused by the wheel jump motion are greatly reduced.
Preferably, the cable 24 is preferably arranged on the upper side of the rotation center of the motor 8, so that the cable immersion probability under the vehicle wading condition can be reduced, and the safety and reliability of the vehicle can be improved.
Preferably, the brake 25 is a fixed caliper disc brake, and is driven by a hydraulic system to provide braking torque so as to realize a vehicle braking function, and preferably, the brake is matched with a fixed caliper multi-piston integrated brake caliper so as to provide larger braking torque so as to realize vehicle emergency safety braking performance and high-gradient parking capacity. The integral pliers body is made of high-strength aluminum alloy, so that the weight is light and no leakage exists; the brake caliper adopts a multi-piston design to enable the load distribution of the brake friction plates to be more uniform, and the service life of the friction plates is prolonged.
Preferably, the heat dissipation water pipes 26 and 29 are connected with the hub motor 8 and the centralized heat dissipation equipment in the vehicle, so that the long-time high-power-density operation of the hub motor is realized; the spring connecting pin shaft 28 is connected with a lower dead point of the hydro-pneumatic spring, so that the longitudinal arm and the elastic damping element form motion coupling, and vibration impact of the vehicle is attenuated.
As the optimization of the above embodiment, the longitudinal arm mounting bracket preferably adopts a mirror image structure design, preferably adopts a mirror image structure design along the central axis of the main bracket 1-1, and mainly comprises the main bracket 1-1 and the auxiliary bracket 1-2. The auxiliary support is positioned with the main support through the positioning groove and the flange plane, and the fastening function is realized through the screws 1-3. Preferably to the vehicle body through a main stand 1-1. The longitudinal arm mounting bracket 3 can be matched with the longitudinal arm suspension devices on the left side and the right side of the vehicle at the same time, so that the universal interchangeability of vehicle parts is realized, and the maintainability guarantee performance of the vehicle is improved.
The trailing arm flange structure is shown in fig. 3-4, and the flange is in the shape of an octopus and comprises a central part and a plurality of claw parts extending outwards from the central part, and the tail ends of the claw parts are provided with connecting holes, preferably threaded holes. The flange structure is first applied in China, and has the characteristics of light structure weight, high rigidity, convenience in processing and the like.
The invention integrates the hub motor, the brake, the cable and the pipeline by utilizing the hollow thin-wall trailing arm structure, thereby realizing the trailing arm type modularized integration of the form driving system; the module has large vehicle jumping stroke, the trailing arm is suitable for large-range swinging, and larger suspension lateral rigidity can be provided, so that the module is a technical guarantee that the vehicle passes through ultrahigh geometric obstacles. And the components are designed in a modularized way, so that the device is interchangeable, energy-consuming, low in manufacturing cost and easy to maintain.
Compared with the prior art, the single-trailing-arm hub adopted by the invention has the following beneficial effects:
(1) the structure integration of wheel hub motor, trailing arm support, cable line for suspension guiding mechanism and motor drive mechanism integration become the general interchange modularization part of vehicle.
(2) The trailing arm is thin wall cavity structural design, can hold motor power cable simultaneously, control cable, heat dissipation water pipe's intracavity integration.
(3) The hub motor and the longitudinal arm are mounted and characterized in that the heat dissipation water pipe is arranged at the inlet and the outlet of the heat dissipation water pipe, is arranged at the far end of the longitudinal arm along the axial direction of the longitudinal arm, and is used for reducing the water group of the heat dissipation water along the pipeline, indirectly reducing the lift and the power of a heat dissipation system, reducing the power loss and improving the energy utilization efficiency of the whole vehicle.
(4) The design of the cover plate round hole can enable the heat dissipation water pipe and the cable line to be stable and orderly, and the water pipe and the cable are compact.
(5) All cables of the motor of the wheel hub are uniformly distributed on one side of the longitudinal arm and point to the positive direction of the vertical direction of the vehicle body. The arrangement mode enables the pipeline to have good protection capability under the vehicle wading working condition and the off-road working condition, and the reliability and the safety of the system are improved.
(6) The structure of the trailing arm is optimized to realize the large-stroke jumping of the wheel; the wheel hop plane is parallel to the central plane of the vehicle body, so that the longitudinal flexibility of the suspension is increased, and the passing capacity of the geometric obstacles of the vehicle is greatly improved; the transverse rigidity of the suspension is increased, and the stability of the vehicle passing through the geometric obstacle is greatly improved.
(7) The hub driving module has the advantages that the parts are arranged and combined, so that the driving module parts suitable for different driving axles and different swing arm directions of the whole vehicle can be formed, the universal capability of the parts is greatly improved, and the requirement on the maintenance and guarantee capability of the system is reduced.
(8) A large amount of researches are carried out on the property selection of the hydro-pneumatic spring, the optimal property of the hydro-pneumatic spring is designed, and the ultrahigh passing performance of the vehicle is improved.
5-6 illustrate a (single trailing arm axle) unmanned vehicle in-wheel motor high mobility ride drive steering system including the single trailing arm in-wheel motor drive module described above, which is particularly preferred for use in light ultra-high powered vehicles, preferably requiring an average off-road speed of 40 km/h; the maximum climbing gradient is not lower than 35 degrees; the maximum side-tipping running gradient is not less than 25 degrees; the width of the crossing trench is not less than 1.4 meters; the height of the upper and lower vertical barriers is not less than 0.9 m.
As shown in fig. 5 and 6, the invention provides a driving control system for driving an unmanned vehicle in-wheel motor, the driving control system adopts a technical scheme that an 8 × 8 independent hydro-pneumatic spring suspension is matched with a distributed driving of the in-wheel motor, a first bridge and a second bridge are single-trailing-arm bridges, a third bridge and a fourth bridge are double-cross-arm bridges, so that optimal attachment and optimal driving torque distribution of wheels under the condition of geometric obstacles on a cross-country road surface of the vehicle can be realized, and further, ultrahigh passing performance of the vehicle is realized; the first axle and the second axle of the driving system adopt a single trailing arm suspension guide mechanism, so that the lateral rigidity of a vehicle suspension system is greatly improved, the vehicle body rollover and sideslip in the process of passing through geometric obstacles of the vehicle are effectively avoided, and the unconventional geometric obstacle crossing capability of the vehicle is realized; the third axle and the fourth axle of the driving system adopt a double-wishbone suspension guide structure, the matched steering system has the vehicle rear wheel steering capacity, the matched vehicle differential control function can realize flexible transverse deflection motion of the vehicle, and the cross-country maneuvering performance of the vehicle is greatly improved.
By adopting the mode that the 1, 2 single trailing arm structural form drive axle and the third, fourth and double transverse arm structural form are mutually combined, the defects of the prior art can be overcome by the operating system, and the operating system can meet the requirements of light motor vehicles.
As shown in fig. 5, the single trailing arm bridge comprises a tire and rim assembly 1, a single trailing arm 2, a trailing arm mounting rack 3, a hydro-pneumatic spring 4 and a hub motor 8; the double-wishbone bridge comprises an upper wishbone 7, a lower wishbone 6, a steering knuckle 12, a hub motor 8 and a steering gear 5. The driving system is matched with a large-torque hub motor, so that climbing and passing of a vehicle on an oversized longitudinal slope and an ultrahigh vertical obstacle can be realized, and the tire and rim assembly 1 is in threaded connection with the output end of the hub motor 8; the tire end of the single longitudinal arm 2 is fixedly connected with the shell of the hub motor 8 in a threaded manner, and the vehicle body end is fastened on a vehicle body through the longitudinal arm mounting bracket 3, so that the longitudinal arm can swing around the transverse axis of the vehicle body by a large angle; the upper cross arm 7 and the lower cross arm 6 are connected with the vehicle body through pin shafts, the cross arm can swing around the vehicle body at a transverse large angle, the ball end of the cross arm is connected with the steering knuckle 12 through a ball hinge at a large angle of 30 degrees (preferably more than 30 degrees), and a steering knuckle deflection axis is formed. The steering knuckle 12 is provided with a steering system connecting point, and the steering knuckle 12 can deflect around the axis of the steering knuckle 12 by being driven by a steering system, so that a steering function is realized; the knuckle 12 is fastened with the in-wheel motor 8 through bolts. The upper fulcrum of the hydro-pneumatic spring 4 is hinged to the vehicle body in a ball joint bearing mode, and the lower fulcrum is respectively connected with the single longitudinal arm 2 and the lower cross arm 6 through a pin shaft and transmits elastic force and damping force therebetween to realize wheel bounce attenuation; the shell of the steering gear 5 is arranged on a vehicle body, the output end drives a steering rocker arm 10 to realize the swinging of the rocker arm relative to the vehicle body, and the middle of the rocker arm realizes the motion coupling through a central pull rod 11; the two ends of the steering pull rod 9 are respectively connected with a steering knuckle 12 and a steering rocker arm 10, and the steering knuckle and the steering rocker arm 10 are driven by the steering rocker arm 10 to drive the hub motor and the tire rim to realize corner deflection. The driving system is matched with the hydro-pneumatic spring and is coordinated with the hydraulic driving system, so that the height, pitching, side tilting and inclined tilting adjustment of the vehicle posture can be realized; the system adopts the fourth axle mechanical steering and matches the vehicle differential steering function, and can realize the vehicle center steering and pivot steering functions; the mechanical steering can realize the flexible transverse maneuvering of the vehicle during high-speed maneuvering.
The driving form belongs to a composite structure form, and the single-trailing-arm suspension structure form has high transverse rigidity, strong longitudinal passing capacity and prominent obstacle crossing capacity; the double-cross-arm suspension is free and flexible in structure, has a mechanical steering function interface, and is strong in steering and turning capacity; the distributed driving hub motor has the advantages of large torque density, more controllable degrees of freedom, strong controllability, flexible and changeable output combination and the like. The system has the advantages of high driving power density, high driving torque density, low system natural frequency, strong transverse stability and high cross-country obstacle crossing capability. Preferably, the arrangement scheme of the trailing arms of the driving system is that the first axle swings forwards and the second axle swings backwards, the approach angle of the vehicle at 90 degrees can be realized, large-area adhesion of wheels of the first axle of the vehicle can be realized by combining the large-stroke low-offset-frequency suspension parameter design, and the ground impact function can be effectively reduced by the wheels of the second, third and fourth axles of the vehicle.
Preferably, the steering gear adopts a drive-by-wire electric steering gear, the integration level is high, and the steer-by-wire function can be realized.
The invention utilizes the distributed driving hub motor to match with the hydro-pneumatic spring for independent suspension, and adopts the hub motor for driving to eliminate the limitation of the traditional transmission device, so that the freedom degree of suspension motion is increased, and the ultra-large stroke vehicle height adjustment can be realized by matching with the hydro-pneumatic spring. The oil cavities of the two-axle hydro-pneumatic spring and the three-axle four-axle hydro-pneumatic spring are communicated through pipelines, so that the vehicle achieves ultrahigh geometric obstacle passing capacity and high-speed off-road surface maneuvering capacity.
One invention point of the scheme is a parameter control method for hydro-pneumatic spring interconnection. In practice, the characteristics of the hydro-pneumatic spring (elastic force, damping force, etc.) are very important, for example, poor hydro-pneumatic spring characteristics can lead to: the smoothness is poor, the service life of the vehicle-mounted equipment is shortened, and sealing parts and fastening parts are loosened; secondly, the vehicle-mounted precision equipment cannot be used; the adhesion effect of the wheels and the ground is reduced, and the safety of the vehicle is reduced; excessive and excessive vibration can damage the suspension and the vehicle body, and the safety of the vehicle is reduced. It is therefore desirable to determine the characteristics of the hydro-pneumatic spring in an optimal manner.
The optimal relational expression of the characteristics of the hydro-pneumatic spring is determined through a great deal of research, and the optimal relational expression is used as an important reference basis for selecting the driving control system for the hub motor running of the unmanned vehicle.
The characteristic determination method of the hydro-pneumatic spring comprises the following steps:
Figure BDA0002517204300000071
wherein P is the absolute pressure of the gas in the hydro-pneumatic spring and is obtained by calculation;
t is thermodynamic temperature and is measured by a temperature sensor; vqCalculating the volume of the gas in the hydro-pneumatic spring;
Rgis a gas constant, preferably 8.314J/(mol. k);
a and b are Van der Waals constants and are obtained through experiments;
mqthe mass of the gas in the hydro-pneumatic spring is calculated by the following formula:
Figure BDA0002517204300000072
in the formula:
Figure BDA0002517204300000073
C＝-36bRgT0+72P0b2+8a
M＝Rg 2T0 2(4bRgT0+12P0b2-a)
N＝4P0(3P0b3RgT0-5abRgT0+b4P0 2+2ab2P0+a2)
P0、V0、T0respectively, the initial gas pressure (unit is MPa) and the volume (unit is mm)3) And temperature (in K), where V0To design value, P0The calculation method comprises the following steps:
Figure BDA0002517204300000074
where m represents the sprung mass of the vehicle, g is the weight acceleration, i is the guide lever ratio, DcThe diameter of the oil-gas spring oil chamber piston is shown, and Ac is the area of the piston.
The volume change of the hydro-pneumatic spring air chamber is as follows:
Figure BDA0002517204300000075
where s is the spring piston stroke.
Then at any stroke, the gas volume is:
Figure BDA0002517204300000076
according to the above formulas, the elastic force of the hydro-pneumatic spring is:
Figure BDA0002517204300000081
under the condition that two oil-gas spring oil-filled cavities are connected in series, the elastic force of the spring is
Figure BDA0002517204300000082
In the formula s1、s2For the stroke of springs in series
During the movement of the spring, the relationship between the flow rate of oil flowing through the throttling hole and the pressure difference between the front and the rear of the damping hole is as follows:
Figure BDA0002517204300000083
Cdthe value range of the flow coefficient is defined,
Figure BDA0002517204300000084
l is the orifice length, ReIs Reynolds number, characteristic length in calculating reynolds number, unit is mm;
the system generates damping force of
Figure BDA0002517204300000085
The optimal relational expression of the characteristics of the hydro-pneumatic spring is determined through a great deal of research, and the optimal relational expression is used as an important reference basis for selecting the driving control system for the hub motor running of the unmanned vehicle.
As an invention point, the invention provides that the following strategy is adopted for determining the parameters of the rear two-axle composite steering:
referring to fig. 9, B is the distance between the intersection points of the kingpin axes on both sides and the ground, preferably 1640 mm; l is1、L2、L3、L4Calculating the distance from each axis to the instant center by a system; r1in、R2in、R3in、R4inThe turning radius of the wheel at the inner side of each shaft is calculated by the system; r1out、R2out、R3out、R4outThe turning radius of the wheel at the outer side of each shaft is calculated by a system; alpha is the wheel corner at the outer side of the third axle and is measured by a corner sensor; beta is the wheel corner at the inner side of the third axle and is measured by a corner sensor; delta is the corner of the wheel at the outer side of the fourth axle and is measured by a corner sensor; gamma is the wheel corner at the inner side of the fourth axle and is measured by a corner sensor; and x and y are the distances from the instant center to the inner wheel and the center of mass respectively, and are calculated by the system.
ω1in、ω2in、ω3in、ω4inFor the angular velocity, omega, of the wheel inside each axle1out、ω2out、ω3out、ω4outFor the angular velocity of the wheel outside each axle, m, n, l are the wheelbases of each axle, preferably 950,900,950mm, R4outR, derived from the geometric motion relationship:
Figure BDA0002517204300000091
Figure BDA0002517204300000092
Figure BDA0002517204300000093
Figure BDA0002517204300000094
Figure BDA0002517204300000095
Figure BDA0002517204300000096
Figure BDA0002517204300000097
through the determined parameters, each parameter can be accurately predicted, strategy guidance can be provided for the obstacle crossing of the vehicle under the unmanned condition, the control logic of the obstacle crossing of the unmanned vehicle is simplified, the reliability of the vehicle in the complex electromagnetic environment is improved, and the method is a technical basis of vehicle global application.
As can be seen from fig. 8 and 9, the angular velocity of each wheel has a definite functional relationship with the track width, the wheel base, the turning radius and the turning angle. The wheel track and wheel base parameters are the whole vehicle parameters and are constants. The upper computer instruction received by the steering ECU is generally curvature or corner, so that the differential matching relation among the wheels can be obtained by utilizing an Ackerman differential steering model.
The parameters are specified below:
Figure BDA0002517204300000098
Figure BDA0002517204300000101
the invention relates to a driving control system for the hub motor of an unmanned vehicle, which has the following advantages:
(1) the running driving system adopts the technical scheme that an 8 multiplied by 8 independent hydro-pneumatic spring suspension is matched with a distributed driving of a hub motor, so that optimal attachment and optimal driving torque distribution of wheels under the conditions of a cross-country road and geometric obstacles of a vehicle can be realized, and further, the ultrahigh passing performance of the vehicle is realized.
(2) The front two axles of the driving system adopt a single trailing arm suspension guide mechanism, so that the lateral rigidity of the vehicle suspension system is greatly improved, the vehicle body rollover and sideslip in the process of passing through geometric obstacles are effectively avoided, and the unconventional geometric obstacle crossing capability of the vehicle is realized.
(3) The third axle and the fourth axle of the driving system adopt a double-wishbone suspension guide structure, the matched steering system has the vehicle rear wheel steering capacity, the matched vehicle differential control function can realize flexible transverse deflection motion of the vehicle, and the cross-country maneuvering performance of the vehicle is greatly improved.
(4) The arrangement scheme of the longitudinal arms of the driving system is that the first axle swings forwards and the second axle swings backwards, the 90-degree approach angle of the vehicle is realized, the large-stroke low-offset-frequency suspension parameter design is combined, the large-area attachment of wheels of the first axle of the vehicle can be realized, and the ground impact function of the wheels of the second, third and fourth axles is effectively reduced.
(5) The driving system is matched with the hydro-pneumatic spring and is coordinated with the hydraulic driving system, so that the height, pitching, side-tipping and inclining adjustment of the vehicle posture can be realized.
(6) The system adopts the fourth axle mechanical steering and matches the vehicle differential steering function, and can realize the vehicle center steering and pivot steering functions; the mechanical steering can realize the flexible transverse maneuvering of the vehicle during high-speed maneuvering.
(7) The steering gear adopts the drive-by-wire steering gear, the integration level is high, and the steer-by-wire function can be realized.
(8) A large amount of researches are carried out on the property selection of the hydro-pneumatic spring, the optimal property of the hydro-pneumatic spring is designed, and the ultrahigh passing performance of the vehicle is improved.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. A wheel hub motor trailing arm suspension comprises a trailing arm mounting bracket, a trailing arm, a wheel hub motor, a cable, a brake, a heat dissipation water pipe, a fastening screw and a spring connecting pin; the longitudinal arm mounting bracket is provided with a threaded interface, and is characterized in that the longitudinal arm is of a thin-wall structure, and the pin shaft end of the longitudinal arm is coupled with the longitudinal arm mounting bracket to form a rotating pair; the hub motor is arranged on the trailing arm interface through a fastening screw rod; the cable and the heat dissipation water pipe penetrate through the cavity of the trailing arm and are led out from the end of the trailing arm bracket; the motor heat dissipation water pipe and the cable are led in from an opening at the far end of the trailing arm and led out from an opening at the mounting side of the trailing arm spring, which is close to the trailing arm mounting bracket; a pipeline protective cover is arranged at the opening at the far end of the longitudinal arm; a metal cover plate is welded at an opening of the trailing arm spring mounting side close to the trailing arm mounting bracket; the cover plate is provided with a round hole matched with the diameters of the heat dissipation water pipe and the cable; the interface of the longitudinal arm and the hub motor is of a radiation flange structure; the section of the thin-wall structure is rectangular; the brake is a fixed caliper disc brake which is driven by a hydraulic system to provide braking torque.
2. The in-wheel motor trailing arm suspension of claim 1, wherein the trailing arm mounting bracket is a split mirror image structure comprising a main bracket and a secondary bracket, the secondary bracket is positioned with the main bracket by a positioning groove and a flange plane.
3. The in-wheel motor trailing arm suspension of claim 1 wherein the brake matches a fixed caliper multiple piston unitary brake caliper.
4. The trailing arm suspension of the in-wheel motor according to claim 1 or 2, wherein all cables of the in-wheel motor are uniformly distributed on one side of the trailing arm and point to the positive direction of the vertical direction of the vehicle body.
5. The in-wheel motor trailing arm suspension according to claim 1 or 2, wherein the opening at the trailing arm spring mounting side near the trailing arm mounting bracket is provided at the trailing arm upper side.
6. The in-wheel motor trailing arm suspension according to claim 1 or 2, characterized in that the spring connecting pin is connected to a hydro-pneumatic spring lower end.
7. An unmanned vehicle in-wheel motor driving steering system comprising the in-wheel motor trailing arm suspension according to any one of claims 1 to 6.
8. The system of claim 7, wherein the hydro-pneumatic spring force is:
Figure FDA0003269255990000011
wherein, the meaning of each parameter is as follows:
Fsrepresenting the elastic force of the hydro-pneumatic spring, and the unit is N;
Rgrepresents a gas constant in units of J/(mol. k);
t represents the thermodynamic temperature in K;
mqthe unit of the mass of the gas in the hydro-pneumatic spring is Kg;
V0the initial volume of gas in the hydro-pneumatic spring is expressed in mm3；
DcThe diameter of the hydro-pneumatic spring piston is shown, and the unit is mm;
s represents the stroke of the hydro-pneumatic spring piston, and the unit is mm;
a represents a Van der Waals constant in atm. multidot.L2/mol2。
CN202010480587.6A 2019-10-24 2020-05-30 Wheel hub motor trailing arm suspension Active CN111923718B (en)

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FR2547544B1 (en) * 1983-06-16 1985-11-29 Renault HYDRAULIC WHEEL MOTOR WITH ROTATING CYLINDER BLOCK AND AXIAL PISTONS
JP3571302B2 (en) * 2001-02-05 2004-09-29 独立行政法人 科学技術振興機構 Wiring structure of suspension part
JP2004306733A (en) * 2003-04-04 2004-11-04 Hitachi Ltd Vehicle suspension system, vehicle body attitude control method and its system
CN100345704C (en) * 2005-07-29 2007-10-31 上海燃料电池汽车动力系统有限公司 Structure of joining independent suspension of single pitch arm, disc brake with electric wheel of internal rotor
DE202007004178U1 (en) * 2007-02-16 2008-06-26 Liebherr-Werk Biberach Gmbh Axle suspension for heavy vehicles
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