CN213921204U - Electric power steering device for wire-controlled chassis of large-scale commercial vehicle - Google Patents
Electric power steering device for wire-controlled chassis of large-scale commercial vehicle Download PDFInfo
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- CN213921204U CN213921204U CN202022663849.0U CN202022663849U CN213921204U CN 213921204 U CN213921204 U CN 213921204U CN 202022663849 U CN202022663849 U CN 202022663849U CN 213921204 U CN213921204 U CN 213921204U
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Abstract
The utility model discloses a large-scale commercial car drive-by-wire is electronic power assisted steering device for chassis, include the steering linkage subassembly of being connected with the knuckle arm, steering linkage subassembly's length is adjustable, steering linkage subassembly include turn to the inner pull rod, with the knuckle arm rotates the outer pull rod of turning to of connecting and is threaded connection's pull rod connecting pipe with turn to inner pull rod and outer pull rod, and turn to inner pull rod and outer pull rod have the external screw thread and turn to the outer screw thread on inner pull rod and the outer pull rod of turning to soon to be opposite. The utility model discloses a large-scale commercial car drive-by-wire is electronic power assisted steering device for chassis, steering linkage assembly's length is adjustable, and steering linkage assembly's length adjustment is efficient, convenient and the assembly of knuckle arm to the mid point position of extreme stroke about adaptation steering wheel meso position.
Description
Technical Field
The utility model belongs to the technical field of vehicle a steering system, specifically speaking, the utility model relates to a large-scale commercial car drive-by-wire chassis is with electronic power assisted steering device.
Background
The pure electric power-assisted steering system is the development direction of the steering systems of urban buses and public roads, and the electric power-assisted steering device for the buses is an execution unit for realizing power-assisted steering of vehicles and is a steering execution mechanism for realizing the complete automatic driving and advanced driving auxiliary functions of the vehicles.
The existing passenger car steering system is basically a hydraulic power-assisted steering system or an electric hydraulic power-assisted steering system, the oil passages of the two steering systems are difficult to arrange and install, the later maintenance cost is high, and certain environmental pollution can be caused due to the need of using hydraulic oil. In addition, these two hydraulic steering systems cannot fully meet the steering function requirements of driving assistance or automatic driving.
And the length of the outer pull rod of the existing passenger car steering system is of a fixed size, so that the outer pull rod is inconvenient to adjust when being assembled with a steering knuckle arm, and the assembly efficiency is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a large-scale commercial car drive-by-wire is electronic power assisted steering device for chassis, the purpose is the steering device who carries the higher integrated level and less part between steering column and the knuckle arm that conveniently assembles and provide.
In order to realize the purpose, the utility model discloses the technical scheme who takes does: the electric power steering device for the large-scale commercial vehicle wire-controlled chassis comprises a steering pull rod assembly connected with a steering knuckle arm, wherein the length of the steering pull rod assembly is adjustable, the steering pull rod assembly comprises an inner steering pull rod, an outer steering pull rod and a pull rod connecting pipe, the outer steering pull rod is connected with the steering knuckle arm in a rotating mode, the pull rod connecting pipe is in threaded connection with the inner steering pull rod and the outer steering pull rod, and the inner steering pull rod and the outer steering pull rod are provided with external threads and the rotating directions of the external threads on the inner steering pull rod and the outer steering pull rod are opposite.
The outer thread on the steering inner pull rod is a left-handed outer thread, and one end of the pull rod connecting pipe is provided with a left-handed inner thread; the external thread on the steering outer pull rod is a right-handed external thread, and the other end of the pull rod connecting pipe is provided with a right-handed internal thread.
The electric power-assisted steering device for the drive-by-wire chassis of the large commercial vehicle further comprises an input shaft, a power-assisted motor, a steering large gear connected with the input shaft, a steering small gear meshed with the steering large gear, a power-assisted small gear connected with the power-assisted motor, a power-assisted large gear meshed with the power-assisted small gear and coaxially connected with the steering small gear, a ball screw mechanism connected with the power-assisted large gear and connected with the inner steering pull rod, and a ball screw mechanism connected with the ball screw mechanism.
The electric power steering device for the drive-by-wire chassis of the large-scale commercial vehicle further comprises a shell assembly, the power-assisted motor is arranged on the shell assembly, and the ball screw mechanism, the steering large gear, the steering small gear, the power-assisted small gear and the power-assisted large gear are located inside the shell assembly.
The ball screw mechanism comprises a screw connected with the steering gear wheel, a nut matched with the screw, a telescopic rod connected with the nut and a guide rod guiding the nut, and the telescopic rod is connected with the steering inner pull rod through a joint bearing.
The guide bar sets up two, be provided with two oilless axle sleeves on the nut, each guide bar passes an oilless axle sleeve respectively.
The knuckle bearing comprises a connecting rod connected with the telescopic rod, a spherical outer ring connected with the connecting rod, a spherical inner ring arranged in a central hole of the spherical outer ring, gaskets arranged at two opposite ends of the spherical inner ring and a dust cover arranged between the spherical outer ring and the inner steering pull rod, the inner steering pull rod is connected with the spherical inner ring through a bolt, and the bolt penetrates through the gaskets and the spherical inner ring.
The inner steering pull rod is provided with a containing groove for containing the knuckle bearing, the containing groove is a U-shaped groove, the number of the dust covers is two, the spherical outer ring is located between the two dust covers, and the two dust covers are respectively contacted with two opposite inner wall surfaces of the containing groove.
The utility model discloses an electronic power assisted steering device is used to large-scale commercial car drive-by-wire chassis, the length of steering linkage subassembly is adjustable, and the length adjustment efficiency of steering linkage subassembly is high, conveniently with the assembly of knuckle arm, with the central point position of adaptation steering wheel meso position in controlling the extreme stroke; and the electric driving of the steering system can be realized, and the passenger car can realize the functions of automatic driving and auxiliary driving conveniently.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic structural view of an electric power steering apparatus for a wire-controlled chassis of a large-sized commercial vehicle according to the present invention;
FIG. 2 is a schematic view of the internal structure of the electric power steering device for the wire-controlled chassis of the large-scale commercial vehicle of the present invention;
FIG. 3 is a schematic structural diagram of an electric power steering system of a passenger car;
FIG. 4 is a cross-sectional view of the steering linkage assembly;
FIG. 5 is a schematic view of the engagement of the nut with the guide bar;
fig. 6 is a schematic structural view of the speed reducing mechanism;
FIG. 7 is a cross-sectional view of a spherical plain bearing;
FIG. 8 is a schematic diagram of the passenger car electric power steering system operating when the steering wheel is turned right;
FIG. 9 is a schematic diagram of the passenger car electric power steering system operating when the steering wheel is turned left;
labeled as: 1. a steering wheel; 2. a steering column; 3. a steering transmission shaft; 4. an electronic control unit; 5. an electric power steering device for a passenger car; 501. a booster motor; 502. a telescopic rod; 503. an outer tie rod for steering; 504. a steering bull gear; 505. a steering pinion gear; 506. a booster pinion; 507. a power-assisted gearwheel; 508. a first housing; 509. a second housing; 510. a housing connection pipe; 511. a lead screw; 512. a nut; 513. an oilless shaft sleeve; 514. a guide bar; 515. a connecting rod; 516. a spherical outer ring; 517. a spherical inner ring; 518. a gasket; 519. a dust cover; 520. a bolt; 521. locking the nut; 522. an input shaft; 523. an inner tie rod; 524. a pull rod connecting pipe; 6. a knuckle arm; 7. and (7) wheels.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation.
It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction relationship in structure and/or function, nor represent a sequential execution order, but merely for convenience of description.
As shown in fig. 1 to 4, the utility model provides a large-scale commercial car drive-by-wire is electronic power assisted steering device for chassis, include the steering linkage subassembly of being connected with knuckle arm 6, the length of steering linkage subassembly is adjustable, and the steering linkage subassembly includes steering inner rod 523, rotates the outer pull rod 503 of being connected with knuckle arm 6 and is threaded connection's pull rod connecting pipe 524 with steering inner rod 523 and outer pull rod 503, and steering inner rod 523 and outer pull rod 503 have the external screw thread and turn to the rotation of the external screw thread on inner rod 523 and the outer pull rod 503 opposite.
Specifically, as shown in fig. 4, the tie rod connecting pipe 524 has a hollow structure with both open ends, one end of the inner tie rod 523 is provided with an external thread, the end of the inner tie rod 523 is inserted into the tie rod connecting pipe 524, the external thread on the inner tie rod 523 is a left-handed external thread, one end of the tie rod connecting pipe 524 is provided with a left-handed internal thread, and the left-handed internal thread in the tie rod connecting pipe 524 is engaged with the external thread on the inner tie rod 523; one end of the outer tie rod 503 is provided with an external thread, the end of the outer tie rod 503 is inserted into the tie rod connecting pipe 524, the other end of the outer tie rod 503 is rotatably connected with the knuckle arm 6, the external thread on the outer tie rod 503 is a right-handed external thread, the other end of the tie rod connecting pipe 524 is provided with a right-handed internal thread, the right-handed internal thread in the tie rod connecting pipe 524 is meshed with the external thread on the outer tie rod 503, and the turning directions of the internal threads arranged at the two ends of the tie rod connecting pipe 524 are opposite. During the rotation of the tie rod connecting pipe 524, the outer tie rod 503 and the inner tie rod 523 at the two ends can move towards each other or away from each other, so as to adjust the length of the tie rod assembly. The screw thread rotation adjustment mode is adopted, and the adjusting device has the advantages of good adjusting accuracy, high accuracy and convenience in adjustment.
Thus, the adjustment of the length dimension of the steering linkage assembly is accomplished by the rotational movement of the linkage connection tube 524. Due to the arrangement of the left-handed and right-handed internal threads on the tie rod connecting pipe 524, the length adjustment is efficient (the inner tie rod 523 and the outer tie rod 503 are shortened or extended simultaneously), the structure is simple, and the connection is reliable.
As shown in fig. 1 to 7, the electric power steering device for passenger cars of the present invention further includes a torque angle sensor, an input shaft 522 connected to the steering shaft 3, a steering large gear 504 connected to the input shaft 522, a steering small gear 505 engaged with the steering large gear 504, a power-assisted motor 501, a power-assisted small gear 506 connected to the power-assisted motor 501, a power-assisted large gear 507 engaged with the power-assisted small gear 506 and coaxially connected to the steering small gear 505, and a ball screw mechanism connected to the power-assisted large gear 507 and connected to the inner steering rod 523 and connected to the ball screw mechanism. The outer tie rod 503 is rotatably connected to a knuckle arm 6 of one of the wheels 7 of the vehicle, and the knuckles of the two wheels 7 of the vehicle are rotatably connected to tie rods, which cause the two wheels 7 to steer synchronously.
As shown in fig. 1 to 3 and 6, the upper end of the steering column 2 is fixedly connected to the steering wheel 1, the lower end of the steering column 2 is fixedly connected to the upper end of the steering transmission shaft 3, the lower end of the steering transmission shaft 3 is fixedly connected to the input shaft 522, the steering large gear 504 is coaxially and fixedly connected to the input shaft 522, and the torque angle sensor is disposed on the input shaft 522. The steering pinion 505 is engaged with the steering bull gear 504 to form a speed increasing mechanism, and the diameter of the steering pinion 505 is smaller than that of the steering bull gear 504. The steering pinion 505 is coaxially and fixedly connected with the power-assisted gearwheel 507, the power-assisted pinion 506 is meshed with the power-assisted gearwheel 507 to form a speed reduction mechanism, the diameter of the power-assisted pinion 506 is smaller than that of the power-assisted gearwheel 507, the power-assisted pinion 506 is fixedly connected with a motor shaft of the power-assisted motor 501, and the axis of the power-assisted pinion 506 is spatially perpendicular to the axis of the input shaft 522.
As shown in fig. 1 to 3 and fig. 6, the electric power steering apparatus for a passenger car of the present invention further includes a housing assembly, the power motor 501 is disposed on the housing assembly, and the ball screw mechanism, the steering large gear 504, the steering small gear 505, the power small gear 506, and the power large gear 507 are disposed inside the housing assembly. The housing assembly includes a first housing 508, a second housing 509, and a housing connection pipe 510, the housing connection pipe 510 has a housing structure with a certain length and a hollow interior, and the first housing 508 and the second housing 509 are respectively fixedly connected to opposite ends of the housing connection pipe 510 in a length direction. The power-assisted motor 501 is fixedly connected with the first housing 508, the input shaft 522 is rotatably arranged on the first housing 508, the steering large gear 504, the steering small gear 505, the power-assisted small gear 506 and the power-assisted large gear 507 are positioned inside the first housing 508, the telescopic rod 502 penetrates through the second housing 509, one end of the telescopic rod 502 is positioned inside the housing connecting pipe 510, and the other end of the telescopic rod 502 is positioned outside the second housing 509. The steering and power-assisted functions are respectively realized by adopting two pairs of gear pairs, and the steering pinion 505, the steering bull gear 504, the power-assisted pinion 506 and the power-assisted bull gear 507 are hyperboloid gears, so that the steering gear has the advantages of compact structure, high gear rigidity, stable transmission, small size of a relative gear and light weight.
As shown in fig. 1 to 3, 5 and 6, the ball screw mechanism includes a screw 511 connected to the steering large gear 504, a nut 512 engaged with the screw 511, an expansion link 502 connected to the nut 512, and a guide rod 514 guiding the nut 512, and the expansion link 502 is connected to the inner steering link 523 via a knuckle bearing. The casing connecting pipe 510 is a cylinder, the screw 511 and the casing connecting pipe 510 are coaxially arranged, the screw 511 is rotatably arranged inside the casing connecting pipe 510, the screw 511 and the steering gear 504 are coaxially and fixedly connected, the screw 511 and the nut 512 form a screw drive, the nut 512 is arranged inside the casing connecting pipe 510, the nut 512 is fixedly connected with one end of the telescopic rod 502, the telescopic rod 502 is a cylinder, and the telescopic rod 502, the screw 511 and the nut 512 are coaxially arranged. After the screw 511 rotates, the nut 512 drives the telescopic rod 502 to move along the axial direction synchronously, and the telescopic rod 502 drives the knuckle arm 6 to rotate through the steering rod assembly, so that the deflection of the wheel 7 is realized, and further the steering of the vehicle is realized.
The steering function is as follows: as shown in fig. 8, when the driver steers the steering wheel 1 to the right to steer the vehicle, the input shaft 522 is driven to rotate clockwise, the steering large gear 504 integrated with the input shaft 522 rotates clockwise, the steering small gear 505 is driven to rotate counterclockwise through gear engagement, and the steering small gear 505 is integrated with the lead screw 511, so that the lead screw 511 is driven to rotate counterclockwise and the nut 512 and the telescopic rod 502 are shortened inwards, thereby driving the wheels 7 to rotate to the right; as shown in fig. 9, when the driver steers the steering wheel 1 to the left to steer the vehicle, the input shaft 522 is driven to rotate counterclockwise, the large steering gear 504 integrated with the input shaft 522 rotates counterclockwise, the small steering gear 505 is driven to rotate clockwise through gear engagement, and the small steering gear 505 is integrated with the lead screw 511, so that the lead screw 511 is driven to rotate clockwise, the nut 512 and the telescopic rod 502 are extended outwards, and the wheels 7 are driven to rotate to the left.
The number of turns of the steering wheel 1 can be adjusted by setting the gear ratio of the steering gear pair so as to adapt to the requirements of different vehicles on the number of turns of the steering wheel 1, the larger the gear ratio is, the smaller the number of turns of the steering wheel 1 is, and otherwise, the smaller the gear ratio is, the more the number of turns of the steering wheel 1 is. Since the steering gear pair is speed-increasing and torque-reducing, when the steering torque for the driver to operate the steering wheel 1 passes through the gear pair, the torque applied to the steering pinion 505 is reduced by the gear ratio, and therefore the gear pair is small in stress, long in service life, reliable and durable.
The power assisting function is as follows: as shown in fig. 9, when a driver steers the steering wheel 1 to steer the vehicle to the right, the input shaft 522 is driven to rotate clockwise, the torque angle sensor welded with the input shaft 522 sends the acquired steering force and steering angle signals to the electronic control unit 4(ECU), after the electronic control unit 4(ECU) processes and calculates the signals, the power-assisted motor 501 and the power-assisted pinion 506 rotate clockwise, the power-assisted gearwheel 507 is driven to rotate counterclockwise through gear engagement, and the power-assisted gearwheel 507 is also connected with the lead screw 511 into a whole, so that the lead screw 511 rotates counterclockwise and the nut 512 and the telescopic rod 502 are shortened inwards, and the wheels 7 are further driven to rotate to the right; as shown in fig. 9, when the driver steers the steering wheel 1 to turn the vehicle leftward, the input shaft 522 is driven to rotate counterclockwise, the torque angle sensor welded with the input shaft 522 sends the obtained steering force and steering angle signals to the electronic control unit 4(ECU), after the electronic control unit 4(ECU) processes and calculates the signals, the power-assisted motor 501 and the power-assisted pinion 506 rotate counterclockwise, the gear engagement drives the power-assisted gearwheel 507 to rotate clockwise, and the power-assisted gearwheel 507 is also connected with the lead screw 511, so that the lead screw 511 rotates clockwise, the nut 512 and the telescopic rod 502 extend outward, and the wheels 7 are further driven to rotate leftward.
The output torque can be changed by setting the gear ratio of the steering gear pair so as to adapt to the requirements of the steering torque of tires of vehicles with different loads, wherein the larger the gear ratio is, the larger the output torque is, and otherwise, the smaller the gear ratio is, the smaller the output torque is. The boosting gear pair is used for reducing speed and increasing torque, and the steering driving torque of the vehicle tire is basically provided by the motor through the boosting gear pair so as to reduce the steering burden of a driver.
As shown in fig. 5, the guide rods 514 are located inside the housing connecting tube 510, the axis of the guide rods 514 is parallel to the axis of the lead screw 511, two guide rods 514 are provided, and the included angle between the two guide rods 514 is 180 degrees. When the nut 512 is linearly reciprocated, the nut 512 is prevented from rotating in the circumferential direction by two guide rods 514. The nut 512 is provided with two oilless bushings 513, and each guide rod 514 passes through one oilless bushing 513. Two circular through holes are processed on the flange surface of the nut 512, each oilless shaft sleeve 513 is respectively installed in one circular hole through hole on the nut 512, the oilless shaft sleeve 513 is made of three layers of composite materials, and the two guide rods 514 respectively penetrate through the central holes of the two oilless shaft sleeves 513. The oilless bushing 513 is in small clearance fit with the guide rod 514, the two ends of the guide rod 514 are fixed, and when the screw receives a rotation moment, the two guide rods 514 restrain the moment in the circumferential direction of the nut 512. The outer circular surface of the guiding rod 514 is chrome-plated and hardened and then polished to ensure the rigidity and surface finish of the guiding rod 514, so that the guiding rod 514 has no bending deformation when keeping linear motion, and the friction coefficient of the oilless bushing 513 is low, thereby ensuring the smooth motion of the nut 512.
As shown in fig. 1, 2 and 7, the knuckle bearing is connected to the steering rod assembly by a fastening member composed of a bolt 520 and a lock nut 521, and includes a connection rod 515 connected to the telescopic rod 502, a spherical outer ring 516 connected to the connection rod 515, a spherical inner ring 517 disposed in a central hole of the spherical outer ring 516, washers 518 disposed at opposite ends of the spherical inner ring 517, and dust covers 519 disposed between the spherical outer ring 516 and the inner steering rod 523, the inner steering rod 523 is connected to the spherical inner ring 517 by a bolt 520, and the bolt 520 passes through the washers 518 and the spherical inner ring 517. The inner tie rod 523 has a receiving groove for receiving the knuckle bearing, the receiving groove is a U-shaped groove, two dust covers 519 are provided, the spherical outer ring 516 is located between the two dust covers 519, and the two dust covers 519 are respectively in contact with two opposite inner wall surfaces of the receiving groove. One end of the connecting rod 515 is fixedly connected with the end of the telescopic rod 502, the spherical outer ring 516 is fixedly connected with the other end of the connecting rod 515, the outer spherical surface of the spherical inner ring 517 is in contact with the inner circular surface of the spherical outer ring 516, the spherical center of the spherical outer ring 516 and the spherical center of the spherical inner ring 517 are at the same point, and the spherical outer ring 516 and the spherical inner ring 517 can rotate relatively. The end of the inner tie rod 523 has a through hole for the bolt 520 to pass through, a center hole for the bolt 520 to pass through is provided at the center of the washer 518, the washer 518 is sandwiched between the spherical inner ring 517 and the inner wall surface of the accommodation groove, and the washer 518 and the spherical inner ring 517 are coaxially provided. When the push-pull rod drives the connecting rod 515 and the spherical outer ring 516 to perform linear motion, the push-pull force is transmitted to the washer 518 through the spherical inner ring 517, then transmitted to the bolt 520 through the washer 518, and then transmitted to the inner tie rod 523 through the bolt 520. The steering linkage assembly performs not only a linear reciprocating motion but also a yawing motion around the spherical center of the spherical inner ring 517 of the knuckle bearing during the steering of the vehicle, and thus the knuckle bearing is provided for the connection.
As shown in fig. 7, a washer 518 is press-fitted to each end of the spherical inner race 517 of the spherical joint bearing, and a dust cover 519 is fitted to each washer 518. The large end of the inner tie rod 523 is formed with a U-shaped groove and is formed with a circular through hole through which a bolt 520 is passed while passing through the spherical inner race 517 of the knuckle bearing, and then is tightened with a lock nut 521. The washer 518 of the knuckle bearing is mainly used for bearing the shearing force in the moving direction, and the height of the washer 518 is increased, so that the deflection angle of the inner tie rod 523 is increased, and the deflection stroke is correspondingly increased. The washer 518 is provided with a dust cover 519, the dust cover 519 is of a circular structure, the dust cover 519 and the washer 518 are coaxially arranged, end faces of two ends of the dust cover 519 in the axial direction are respectively attached to an end face of the spherical outer ring 516 and an inner wall face of the accommodating groove, and when the inner steering rod 523 performs deflection motion, the dust cover 519 can effectively seal between the inner steering rod 523 and the knuckle bearing, so that the dust cover 519 has the functions of dust prevention and water prevention. The knuckle bearing with the structure is convenient to assemble, simple and reliable, and low in manufacturing cost.
The electric power steering device for the wire-controlled chassis of the large-scale commercial vehicle with the structure has the following advantages:
1. the weight is light, and the application of the novel energy bus is more advantageous;
2. the whole vehicle is convenient to arrange, and the original vehicle steering gear arrangement scheme is adopted;
3. the product has high integration level and convenient installation, and does not have complex oil paths and oil path accessories which need to be assembled;
4. the steering is light, the noise is low, and the steering comfort and the active safety are high;
5. no hydraulic oil circuit exists, the oil leakage problem does not exist, and the environmental pollution is not caused;
6. different vehicle types can be matched quickly, and the best performance can be realized only by debugging the software setting of the electronic control unit 4;
7. the whole life cycle is maintenance-free, and fault diagnosis can be automatically and rapidly carried out;
8. the steering function requirements of auxiliary driving and automatic driving can be met;
9. the number of parts is small, and the cost is low;
10. the energy consumption is low, and the power-assisted motor 501 only works when the vehicle performs steering action;
11. the electric power steering device is an integrated telescopic structure, the integration level is high, and the mechanical efficiency of the direct-acting telescopic structure is high;
12. the device controls the running direction and torque output of a power steering motor through signal processing and data operation of an Electronic Control Unit (ECU) according to the running speed of an automobile and the direction and torque of a steering wheel rotated by a driver, and drives a power assisting big gear assembled on a ball screw to realize power assistance through a power assisting small gear connected to the motor.
The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.
Claims (8)
1. The utility model provides a large-scale commercial car drive-by-wire is electronic power assisted steering device for chassis, includes the steering linkage subassembly of being connected with the knuckle arm, its characterized in that: the length of the steering pull rod assembly is adjustable, the steering pull rod assembly comprises an inner steering pull rod, an outer steering pull rod and a pull rod connecting pipe, the outer steering pull rod is connected with the knuckle arm in a rotating mode, the pull rod connecting pipe is in threaded connection with the inner steering pull rod and the outer steering pull rod, the inner steering pull rod and the outer steering pull rod are provided with external threads, and the rotating directions of the external threads on the inner steering pull rod and the outer steering pull rod are opposite.
2. The electric power steering device for the drive-by-wire chassis of the large-scale commercial vehicle according to claim 1, characterized in that: the outer thread on the steering inner pull rod is a left-handed outer thread, and one end of the pull rod connecting pipe is provided with a left-handed inner thread; the external thread on the steering outer pull rod is a right-handed external thread, and the other end of the pull rod connecting pipe is provided with a right-handed internal thread.
3. The electric power steering device for the drive-by-wire chassis of the large commercial vehicle according to claim 1 or 2, characterized in that: the power-assisted steering device is characterized by further comprising an input shaft, a power-assisted motor, a steering large gear connected with the input shaft, a steering small gear meshed with the steering large gear, a power-assisted small gear connected with the power-assisted motor, a power-assisted large gear meshed with the power-assisted small gear and coaxially connected with the steering small gear, and a ball screw mechanism connected with the power-assisted large gear and connected with the inner steering pull rod.
4. The electric power steering device for the drive-by-wire chassis of the large-scale commercial vehicle according to claim 3, characterized in that: the power-assisted motor is arranged on the shell assembly, and the ball screw mechanism, the steering gear wheel, the steering pinion, the power-assisted pinion and the power-assisted gear wheel are located inside the shell assembly.
5. The electric power steering device for the drive-by-wire chassis of the large-scale commercial vehicle according to claim 3, characterized in that: the ball screw mechanism comprises a screw connected with the steering gear wheel, a nut matched with the screw, a telescopic rod connected with the nut and a guide rod guiding the nut, and the telescopic rod is connected with the steering inner pull rod through a joint bearing.
6. The electric power steering device for the drive-by-wire chassis of the large-scale commercial vehicle according to claim 5, characterized in that: the guide bar sets up two, be provided with two oilless axle sleeves on the nut, each guide bar passes an oilless axle sleeve respectively.
7. The electric power steering device for the drive-by-wire chassis of the large-scale commercial vehicle according to claim 5, characterized in that: the knuckle bearing comprises a connecting rod connected with the telescopic rod, a spherical outer ring connected with the connecting rod, a spherical inner ring arranged in a central hole of the spherical outer ring, gaskets arranged at two opposite ends of the spherical inner ring and a dust cover arranged between the spherical outer ring and the inner steering pull rod, the inner steering pull rod is connected with the spherical inner ring through a bolt, and the bolt penetrates through the gaskets and the spherical inner ring.
8. The electric power steering device for the drive-by-wire chassis of the large-scale commercial vehicle according to claim 7, characterized in that: the inner steering pull rod is provided with a containing groove for containing the knuckle bearing, the containing groove is a U-shaped groove, the number of the dust covers is two, the spherical outer ring is located between the two dust covers, and the two dust covers are respectively contacted with two opposite inner wall surfaces of the containing groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022663849.0U CN213921204U (en) | 2020-11-17 | 2020-11-17 | Electric power steering device for wire-controlled chassis of large-scale commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022663849.0U CN213921204U (en) | 2020-11-17 | 2020-11-17 | Electric power steering device for wire-controlled chassis of large-scale commercial vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN213921204U true CN213921204U (en) | 2021-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022663849.0U Active CN213921204U (en) | 2020-11-17 | 2020-11-17 | Electric power steering device for wire-controlled chassis of large-scale commercial vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112249153A (en) * | 2020-11-17 | 2021-01-22 | 安徽德孚转向系统股份有限公司 | Electric power steering device for wire-controlled chassis of large-scale commercial vehicle |
-
2020
- 2020-11-17 CN CN202022663849.0U patent/CN213921204U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112249153A (en) * | 2020-11-17 | 2021-01-22 | 安徽德孚转向系统股份有限公司 | Electric power steering device for wire-controlled chassis of large-scale commercial vehicle |
| CN112249153B (en) * | 2020-11-17 | 2024-07-05 | 安徽德孚转向系统股份有限公司 | Electric power steering device for large-scale commercial vehicle drive-by-wire chassis |
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