CN114771647B - Spiral variable transmission ratio mechanism, electro-hydraulic power steering system applying same and method - Google Patents
Spiral variable transmission ratio mechanism, electro-hydraulic power steering system applying same and method Download PDFInfo
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- CN114771647B CN114771647B CN202210700395.0A CN202210700395A CN114771647B CN 114771647 B CN114771647 B CN 114771647B CN 202210700395 A CN202210700395 A CN 202210700395A CN 114771647 B CN114771647 B CN 114771647B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0454—Worm gears
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
- B62D5/005—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup means for generating torque on steering wheel or input member, e.g. feedback
- B62D5/006—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup means for generating torque on steering wheel or input member, e.g. feedback power actuated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0463—Controlling the motor calculating assisting torque from the motor based on driver input
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
- B62D5/0487—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures detecting motor faults
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
- B62D5/064—Pump driven independently from vehicle engine, e.g. electric driven pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
Abstract
The invention relates to an automobile steering system, in particular to a spiral transmission ratio changing mechanism, an electro-hydraulic power-assisted steering system using the same and an electro-hydraulic power-assisted steering method using the same. The spiral variable transmission ratio mechanism comprises a variable transmission ratio motor and a connecting assembly, the connecting assembly comprises a spiral transmission connecting piece and a connecting rod, the spiral transmission connecting piece is fixedly connected with the connecting rod, and the connecting rod is connected with the lifting rod through a spherical hinge. Through the spiral variable transmission ratio mechanism, the steering system has a smaller transmission ratio at a low speed and a larger transmission ratio at a high speed, so that the automobile is flexibly and stably steered.
Description
Technical Field
The invention relates to an automobile steering system, in particular to a spiral transmission ratio changing mechanism, an electro-hydraulic power-assisted steering system using the same and an electro-hydraulic power-assisted steering method using the same.
Background
With the rapid development of the automobile industry, the energy consumption, the safety and the comfort of the automobile are more and more emphasized, as a key part of an automobile chassis system, a power steering system provides a proper power torque for a driver under a steering working condition, the power steering system is the most direct and effective way for the driver to perform the transverse control of the automobile, and the performance of the power steering system directly influences the driving comfort and the driving safety of the driver. At present, a hydraulic power-assisted steering system and an electric power-assisted steering system are generally adopted by an automobile, and power is output by an external power source, so that a driver is light and convenient to carry out steering operation. The hydraulic power assistance can provide larger power assistance torque, but a control valve of a hydraulic system has larger throttling loss and low energy efficiency; although the electric power assistance is high in energy efficiency, the magnitude of the assistance provided by the electric power assistance is limited due to the limitation of electric power density, and the electric power assistance cannot be applied to occasions with large steering resistance torque.
In addition, the steering variable transmission ratio technology of the automobile can continuously change the transmission ratio of a steering system according to the change of the automobile speed, so that the low-speed steering is more flexible, and the high-speed steering is more stable and safer. In the early research of a steering variable transmission mechanism in foreign countries, in 2004, BMW has published a variable transmission ratio active steering system based on a double-row planetary gear reducer, which is developed together with German Caefox company, and then applied to a new generation of BMW cars. The double-planetary gear transmission mechanism has high efficiency and good sensitivity, is widely applied to an automobile steering system, but needs two pairs of planetary gear mechanisms, has more parts, complex structure and more fault points. Patent CN107600173A discloses a hydraulic variable transmission ratio steering system for an automobile, but the variable transmission ratio is realized by a valve-controlled hydraulic cylinder, so that certain throttling loss exists, and the system energy efficiency is low.
In view of the above problems, a new automobile steering variable transmission ratio mechanism and a steering power-assisted system are needed to realize active steering with high energy efficiency, high performance and high reliability for an automobile.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a spiral transmission ratio changing mechanism with simple structure, low energy consumption and high reliability, and an electro-hydraulic power-assisted steering system and method applying the spiral transmission ratio changing mechanism.
The invention adopts the following technical contents: the spiral transmission ratio changing mechanism comprises a transmission ratio changing motor and a connecting assembly, wherein the connecting assembly comprises a spiral transmission connecting piece and a connecting rod, the transmission ratio changing motor drives the spiral transmission connecting piece to rotate, the spiral transmission connecting piece is connected with a steering shaft of a steering system in a spiral transmission mode, the spiral transmission connecting piece is fixedly connected with the connecting rod, and the connecting rod is connected with the lifting rod through a spherical hinge.
The spiral transmission ratio changing mechanism is characterized in that: the variable transmission ratio motor drives the connecting assembly through a worm and gear mechanism.
The utility model provides an electricity liquid helping hand steering system who contains spiral variable transmission ratio mechanism, includes mechanical transmission module and electricity liquid helping hand module, electricity liquid helping hand module includes driving motor, hydraulic pump, hydraulic motor and energy storage ware, driving motor and hydraulic pump coaxial coupling, and hydraulic pump both sides hydraulic port forms closed return circuit with hydraulic motor both sides hydraulic port intercommunication respectively, and hydraulic motor both sides hydraulic port sets up an overflow valve by hydraulic motor to the one-way conduction of energy storage ware respectively, and hydraulic motor both sides hydraulic port sets up a check valve by the one-way conduction of energy storage ware to hydraulic motor respectively.
The electro-hydraulic power-assisted steering system is characterized in that: the mechanical transmission module comprises a first steering shaft, a second steering shaft and a speed reducing mechanism, the first steering shaft is connected with a steering wheel, the second steering shaft is connected with the spiral transmission connecting piece in a spiral transmission mode, the speed reducing mechanism is connected with an output shaft of the hydraulic power assisting module to achieve power assisting, and the second steering shaft is connected with the first steering shaft through a clutch.
The electro-hydraulic power-assisted steering system is characterized in that: the automatic transmission system is characterized by further comprising a control module, wherein the control module comprises a vehicle speed sensor, a controller, a torque sensor and a corner sensor, the torque sensor and the corner sensor are arranged on a first steering shaft of the mechanical transmission module, the input end of the controller is connected with the torque sensor, the corner sensor and the vehicle speed sensor, and the output end of the controller is connected with a driving motor and a transmission ratio variable motor.
The electro-hydraulic power-assisted steering system is characterized in that: the lifting rod is connected with the sector shaft, the steering rocker arm, the tie rod and the tire in sequence, so that the mechanical transmission steering function of the automobile is realized.
A transmission ratio changing method of an electro-hydraulic power-assisted steering system is adopted, and comprises the following steps:
(1) Control module receiverA rotation angle signal for driving the first and second steering shafts to rotatee 1 And a vehicle speed signal, and determining a transmission ratio according to the vehicle speed signal;
(2) According to the transmission ratio obtained in the step (1), the variable transmission ratio motor rotates and is transmitted to the spiral transmission connecting piece through the worm gear and the worm so as to enable the spiral transmission connecting piece to rotate at an angleθ 2 ；
(3) Angle of rotation of the second steering shaftθ 1 Rotating angle with screw drive connecting pieceθ 2 The relative rotation angle of the screw transmission pair isθ 1 -θ 2 ；
(4) The linear displacement of the lifting rod is as follows:
and further obtaining the tire corner as follows:
；
in the formula:Lis a lead of a screw transmission pair,kis the transmission ratio between the lifting rod displacement and the tire rotation angle.
According to the invention, the spiral transmission ratio changing mechanism enables the steering system to have a smaller transmission ratio at a low speed and a larger transmission ratio at a high speed, so that the automobile is flexible and stable in steering; according to the invention, the electro-hydraulic power-assisted module is used for assisting the steering shaft, so that the throttling loss of a hydraulic system is reduced, the energy efficiency is improved, and good comprehensive steering performance is obtained.
Drawings
FIG. 1 is a schematic structural view of an electro-hydraulic power-assisted variable transmission ratio steering system of an automobile according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a variable transmission ratio steering system of a pure electric power-assisted vehicle in a second embodiment of the invention.
In the figure, 1-a steering wheel, 2-a torque sensor, 3-a rotation angle sensor, 4-a first steering shaft, 5-a clutch, 6-a speed reducing mechanism, 61-a first speed reducing mechanism, 62-a second speed reducing mechanism, 7-a second steering shaft, 8-a worm gear mechanism, 9-a variable transmission ratio motor, 10-a variable transmission ratio mechanism, 11-a connecting rod, 12-a ball hinge, 13-a lifting rod, 14-a wheel, 15-a transverse pull rod, 16-a steering rocker arm, 17-a sector shaft, 18-a spiral transmission connecting piece, 19-a hydraulic motor, 20-a first one-way valve, 21-a second one-way valve, 22-a first overflow valve, 23-a second overflow valve, 24-an energy accumulator, 25-a hydraulic pump, 26-a driving motor, 27-an electro-hydraulic power module, 28-a controller, 29-a vehicle speed sensor, 30-a first power assisting motor, 31-a first electric power assisting module, 32-a second power assisting motor and 33-a second electric power assisting module.
Detailed Description
The first embodiment is as follows:
as shown in FIG. 1, an electro-hydraulic power-assisted variable transmission ratio steering system for an automobile comprises a mechanical transmission module, an electro-hydraulic power-assisted module 27, a variable transmission ratio mechanism 10 and a control module.
The mechanical transmission module comprises a steering wheel 1, a first steering shaft 4, a clutch 5, a second steering shaft 7, a spherical hinge 12, a lifting rod 13, a sector shaft 17, a steering rocker 16 and a tie rod 15, wherein the tie rod 15 is connected with a tire 14. The first steering shaft 4 is connected to the steering wheel 1 at one end and to the second steering shaft 7 at the other end via a clutch 5, and transmits rotation and torque to the second steering shaft 7. The other end of the second steering shaft 7 is of a screw rod structure and is connected with a variable transmission ratio mechanism 10 in a screw transmission mode. The variable transmission ratio mechanism further pushes/pulls the lifting rod 13 through the ball joint 12, the lifting rod 13 is meshed with the sector shaft 17, and the steering of the tire 14 is driven through the steering rocker 16 and the tie rod 15.
The electro-hydraulic power assisting module 27 comprises a hydraulic motor 19, a first check valve 20, a second check valve 21, a first overflow valve 22, a second overflow valve 23, an accumulator 24, a hydraulic pump 25 and a driving motor 26. Specifically, the driving motor 26 drives the hydraulic pump 25 coaxially connected therewith to rotate according to the control module signal, and the oil inlet and the oil outlet of the hydraulic pump 25 are respectively communicated with the oil inlet and the oil outlet of the hydraulic motor 19 to form a closed loop, so as to drive the hydraulic motor 19 to rotate. The two cavities of the hydraulic motor are simultaneously communicated with an oil inlet of a first overflow valve 22, an oil inlet of a second overflow valve 23, an oil outlet of a first one-way valve 20 and an oil outlet of a second one-way valve 21. Oil inlets of the first check valve 20 and the second check valve 21 are respectively communicated with the energy accumulator 24 and are used for compensating leakage of the pump control motor system, and when the pressure of the two cavities of the hydraulic motor is lower than the pressure of the energy accumulator 24, the energy accumulator 24 supplies oil to the system through the first check valve 20 or the second check valve 21, so that the two cavities of the hydraulic motor are prevented from being sucked. When the pressure of the two cavities of the hydraulic motor is greater than the safety pressure, high-pressure oil of the hydraulic system flows to the energy accumulator through the first overflow valve 22 or the second overflow valve 23, and the safety of the hydraulic power-assisted module is guaranteed. The hydraulic motor 19 is further connected to the speed reduction mechanism 6, and the torque is amplified by the speed reduction mechanism 6 to assist the second steering shaft 7. In the working process of the electro-hydraulic power-assisted module 27, the rotating speed of the hydraulic motor 19 is directly controlled by the driving motor 26 and the hydraulic pump 25, the system has no throttling loss and high energy efficiency, the energy supply burden of a vehicle-mounted battery can be reduced, and the cruising ability of the automobile is improved.
The variable transmission ratio mechanism 10 comprises a variable transmission ratio motor 9, a worm gear mechanism 8, a spiral transmission connecting piece 18 and a connecting rod 11. Specifically, the variable transmission ratio motor 9 transmits motion to the spiral transmission connecting piece 18 through the worm gear mechanism 8, the spiral transmission connecting piece 18 is connected with the second steering shaft 7 in a spiral transmission mode, the spiral transmission connecting piece 18 is fixedly connected with the connecting rod 11, and the connecting rod 11 is connected with the lifting rod 13 through the spherical hinge 12. The variable transmission ratio function is realized by controlling the rotation angle of the variable transmission ratio motor 9, and the variable transmission ratio principle is as follows:
when the rotation angle of the variable transmission ratio motor 9 is 0 degree, the rotation angle of the spiral transmission connecting piece 18 around the axis is 0 degree, and the rotation angle of the steering wheel 1 isθ 1 The transmission is transmitted to the screw transmission connecting piece 18 and the connecting rod 11 of the transmission ratio changing mechanism through the first steering shaft 4 and the second steering shaft 7. By means of screw drive pairs, the angle of rotation of the second steering shaftθ 1 Into axial linear displacement of the screw drive connection 18:
in the formula:Lis a screw transmission pair lead.
Axial linear displacement of the screw drive connection 18xWhich in turn is transmitted to the lifting bar 13 via the connecting rod 11 and the ball joint 12.
Displacement of the lifting rod 13xAngle of rotation with the tyre 14θThe transmission ratio between is constantkThen the tire 14 rotation angle is:
the variable transmission ratio motor 9 rotates by a certain angle, and the worm gear mechanism 8 drives the spiral transmission connecting piece 18 to rotate by a certain angle around the axis of the spiral transmission connecting pieceθ 2 The angle of rotation of the screw drive connection 18 relative to the second steering spindle 7 is nowθ 1 -θ 2 Then the linear displacement of the screw drive connection 18 is:
the tire 14 has a rotation angle of:
thus, the steering wheel angleθ 1 When the same, the rotation angle of the variable transmission ratio motor 9 is adjusted, the rotation angle of the tire 14 can be changed, and the rotation angle is changed to be
And further realize the function of variable transmission ratio. The rotation angle size of the variable transmission ratio motor 9 can be continuously adjusted according to the requirement of the transmission ratio of the automobile steering system, the high-speed stability and the low-speed portability of the steering system are guaranteed, the automobile is actively prevented from rollover, and the misoperation risk of a driver is effectively reduced.
The ball joint 12 in this embodiment may be replaced by other low-level connecting members, such as universal joints, knuckle bearings, etc., which are used to allow the connecting rod 11 and the lifting rod 13 to rotate freely during the pushing/pulling process, so that other connecting methods capable of producing similar technical effects are also within the scope of this patent.
The control module comprises a torque sensor 2, a rotation angle sensor 3, a vehicle speed sensor 29 and a controller 28 for receiving vehicle information and outputting control signals. Specifically, the torque sensor 2 is mounted on the first steering shaft 4, and acquires the torque input by the driver and transmits a torque signal to the controller 28; the steering angle sensor 3 is arranged on the first steering shaft 4, acquires a steering wheel steering angle signal input by a driver when the automobile steers and transmits the steering wheel steering angle signal to the controller 28; a vehicle speed sensor 29 is mounted on the vehicle for acquiring a vehicle speed signal and transmitting the vehicle speed signal to the controller 28. The controller 28 controls the driving motor 26 and the variable transmission ratio motor 9 to work according to requirements.
According to the driving demand, the car except adopting mechanical steering mode, a steering system also can adopt intelligent drive-by-wire mode, realizes the autopilot function, specifically is: the clutch 5 is disconnected, the controller 28 collects parameters of the running automobile, a rotating speed control signal of the driving motor 26 is given out through operation, the driving motor 26 directly controls the second steering shaft 7 to rotate as required through the hydraulic power assisting module, and the second steering shaft sequentially passes through the variable transmission ratio mechanism and the mechanical transmission module to achieve the automobile steering function. The freedom of control of the drive motor 26 enables the force ratio and the angle ratio of the steer-by-wire system to be changed within a relatively large range, and the required steering speed is output directly through internal calculation of the controller 28, so that the low-speed steering is more flexible and the high-speed steering stability is increased.
Example two:
as shown in fig. 2, an electric power-assisted steering system with variable transmission ratio for an automobile includes a mechanical transmission module, a first electric power-assisted module 31, a second electric power-assisted module 33, a transmission ratio variable mechanism 10, and a control module.
The first electric assist module 31 includes a first assist motor 30 and a first reduction mechanism 61. The first assisting motor 30 is connected with the first steering shaft 4 through a first speed reducing mechanism 61, and the first assisting motor 30 outputs a proper torque according to a control module signal, and assists the first steering shaft 4 after the torque amplification effect of the first speed reducing mechanism 61.
The second electric power module 33 includes a second power motor 32 and a second speed reduction mechanism 62, the second power motor 32 is connected to the second steering shaft 7 through the second speed reduction mechanism 62, the second power motor 32 outputs a suitable torque according to a control module signal, and performs power assistance on the second steering shaft 7 after the torque amplification effect of the second speed reduction mechanism 62.
The structures and the working principles of the mechanical transmission module, the variable transmission ratio mechanism 10 and the control module are consistent with those of the embodiment.
According to the driving demand, the car except adopting mechanical steering mode, a steering system also can adopt intelligent drive-by-wire mode, realizes the autopilot function, specifically is: the clutch 5 is disconnected, the controller 28 collects parameters of the running automobile, a rotating speed control signal of the second power-assisted motor 32 is given out through calculation, the second power-assisted motor 32 controls the second steering shaft 7 to rotate as required through the second speed reducing mechanism 62, and the second steering shaft sequentially passes through the variable transmission ratio mechanism 10 and the mechanical transmission module to achieve the automobile steering function. In the drive-by-wire mode, the first power motor 30 is used as a road feel simulation motor, the steering actuator inputs external environment information such as wheel aligning torque and frictional resistance torque with the ground, which are acquired by the sensor, into the controller 28, and the controller 28 controls the first power motor 30 to output corresponding resistance torque to simulate driving road feel and feed back the driving road feel to a driver according to the provided information.
When the first electric power-assisted module 31 fails, the second electric power-assisted module 33 continues to provide power assistance for the steering system; when the second electric power assisting module 33 fails, the first electric power assisting module 31 continues to provide power assisting for the steering system; when the first electric power-assisted module 31 and the second electric power-assisted module 33 both have faults, the automobile can still realize emergency steering under the mechanical transmission module, and the safety of a steering system is ensured by the triple-steering redundancy design. In addition, the automobile has two steering redundancy modes of mechanical steering and intelligent steer-by-wire, and the driving reliability of the automobile is further ensured.
Claims (7)
1. Spiral becomes drive ratio mechanism, including variable drive ratio motor and coupling assembling, characterized by: coupling assembling includes screw drive connecting piece and connecting rod, the screw drive connecting piece is connected with a steering shaft screw drive of a steering system, the steering shaft passes through the vice its rotary motion transformation of screw drive connecting piece and is become the axial linear displacement of screw drive connecting piece, variable drive ratio motor drive the screw drive connecting piece revolutes the steering shaft and rotates, and follows steering shaft axial linear motion, screw drive connecting piece and connecting rod fixed connection, the connecting rod passes through the ball pivot and is connected with the lifting rod, and the axial linear displacement of screw drive connecting piece loops through connecting rod and ball pivot transmit to the lifting rod, lifting rod and sector axle intermeshing turns to through steering rocker arm and tie rod drive tire.
2. A helical ratio mechanism as set forth in claim 1, wherein: the variable transmission ratio motor drives the connecting assembly through a worm and gear mechanism.
3. An electro-hydraulic power steering system incorporating a helical variable ratio mechanism as claimed in claim 1 or claim 2, comprising a mechanical drive module and an electro-hydraulic power module, characterised in that: the electro-hydraulic power assisting module comprises a driving motor, a hydraulic pump, a hydraulic motor and an energy accumulator, the driving motor is coaxially connected with the hydraulic pump, oil ports on two sides of the hydraulic pump are respectively communicated with oil ports on two sides of the hydraulic motor to form a closed loop, the oil ports on two sides of the hydraulic motor are respectively provided with an overflow valve which is in one-way conduction from the hydraulic motor to the energy accumulator, and the oil ports on two sides of the hydraulic motor are respectively provided with a one-way valve which is in one-way conduction from the energy accumulator to the hydraulic motor.
4. The electro-hydraulic power steering system according to claim 3, wherein: the mechanical transmission module comprises a first steering shaft, a second steering shaft and a speed reducing mechanism, the first steering shaft is connected with a steering wheel, the second steering shaft is connected with the spiral transmission connecting piece in a spiral transmission mode, the speed reducing mechanism is connected with an output shaft of the hydraulic power assisting module to achieve power assisting, and the second steering shaft is connected with the first steering shaft through a clutch.
5. The electro-hydraulic power steering system of claim 3, wherein: the automatic transmission system is characterized by further comprising a control module, wherein the control module comprises a vehicle speed sensor, a controller, a torque sensor and a corner sensor, the torque sensor and the corner sensor are arranged on a first steering shaft of the mechanical transmission module, the input end of the controller is connected with the torque sensor, the corner sensor and the vehicle speed sensor, and the output end of the controller is connected with a driving motor and a transmission ratio variable motor.
6. The electro-hydraulic power steering system of claim 3, wherein: the lifting rod is sequentially connected with the sector shaft, the steering rocker arm, the tie rod and the tire, so that the mechanical transmission steering function of the automobile is realized.
7. A method for changing a transmission ratio of an electro-hydraulic power steering system, which adopts the electro-hydraulic power steering system according to claim 5, and is characterized in that: comprises the following steps:
(1) The control module receives a corner signal that the steering wheel drives the first steering shaft and the second steering shaft to rotatee 1 And a vehicle speed signal, and determining a gear ratio based on the vehicle speed signal;
(2) According to the transmission ratio obtained in the step (1), the variable transmission ratio motor rotates and is transmitted to the spiral transmission connecting piece through the worm gear and the worm so as to enable the spiral transmission connecting piece to rotate at an angleθ 2 ；
(3) Angle of rotation of the second steering shaftθ 1 Rotating angle with screw drive connecting pieceθ 2 The relative rotation angle of the screw transmission pair isθ 1 -θ 2 ；
(4) The linear displacement of the lifting rod is as follows:
and further obtaining the tire corner as follows:
；
in the formula:Lis a lead of a screw transmission pair,kthe transmission ratio between the lifting rod displacement and the tire rotation angle is adopted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210700395.0A CN114771647B (en) | 2022-06-21 | 2022-06-21 | Spiral variable transmission ratio mechanism, electro-hydraulic power steering system applying same and method |
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| CN202210700395.0A CN114771647B (en) | 2022-06-21 | 2022-06-21 | Spiral variable transmission ratio mechanism, electro-hydraulic power steering system applying same and method |
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| CN114771647B true CN114771647B (en) | 2022-10-21 |
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