An electric power steering system

Abstract

The present invention relates to the technical field of steering systems, and in particular provides an electric power steering system. The electric power steering system includes a steering axle, two steering motors, a steering wheel and a proportional potentiometer. The present invention can intelligently adjust the output power of the steering motor according to key parameters such as the rotation speed and angle of the steering wheel and the vehicle driving speed, ensuring appropriate steering assistance under different driving conditions, and ensuring the sensitivity and accuracy of steering, avoiding unnecessary energy consumption, and improving driving comfort, safety, accuracy and energy conservation. In addition, it can utilize the suction of external cooling air and ensure the uniform and rapid flow of the cooling lubricant, and achieve rapid cooling of the steering motor through the combination of the two, quickly reducing the working temperature of the steering motor, preventing overheating, and ensuring the stable working state of the steering motor under various working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of steering systems, and in particular provides an electric power steering system. Background Art

[0002] An electric power steering system (EPS) is an advanced technology that directly provides steering assistance through an electric motor. Compared with traditional hydraulic power steering systems, electric power steering systems have higher energy efficiency and flexibility. Its working principle is that the controller adjusts the magnitude and direction of the current of the electric motor in real time according to the vehicle speed and torque signals collected by the sensors, so as to achieve the assistance of the steering wheel.

[0003] However, in electric engineering vehicles (such as electric forklifts, electric forklift trucks, etc.), many steering assistance systems still use hydraulic drive, that is, the hydraulic system converts the power output of the electric motor into the pressure of the hydraulic pump and applies an auxiliary force to the steering system. Although the hydraulic system performs well in some applications, its overall energy consumption is relatively high, especially in the case of long-term operation, and the efficiency is low. In addition, the response speed of the hydraulic system is relatively slow. Especially when the electric engineering machinery faces large load changes, it is easy to cause power waste and insufficient steering sensitivity, thus affecting the accuracy of control, and it will also cause a large amount of heat to be generated by the electric motor and other components, resulting in a decline in system performance and even damage. Summary of the Invention

[0004] Based on this, it is necessary to provide an electric power steering system to solve at least one technical problem in the background art.

[0005] An electric power steering system includes a steering axle, two steering motors, a steering wheel and a proportional potentiometer. The two steering motors are symmetrically arranged at both ends of the middle part inside the steering axle respectively to drive the steering axle for positioning steering. The proportional potentiometer is installed in the steering wheel and electrically connected to it. The proportional potentiometer is electrically connected to the two steering motors respectively to control the two steering motors according to the rotation amplitude of the steering wheel.

[0006] As a further improvement of the present invention, knuckles are respectively convexly provided inwardly at both ends of one side of the steering axle. A hub is rotatably provided at the outer end of each knuckle. A knuckle arm is convexly provided at the inner end of the knuckle. The inner end of the knuckle arm is rotatably provided with a steering tie rod, and a regulating screw barrel is provided at the inner end of the steering tie rod; A connecting transmission device is provided at the outer end of each steering motor. Each connecting transmission device includes a housing assembly, an input assembly, an output assembly and a rotating cooling impeller. The housing assembly includes a connecting inner cylinder and a mounting outer cylinder. The inner side of the connecting inner cylinder is mounted on the outer edge of the outer side of the steering motor. An outer cylinder mounting ring is convexly provided on the outer side of the connecting inner cylinder. The inner side of the mounting outer cylinder is mounted in the outer cylinder mounting ring. The input assembly is rotatably mounted in the connecting inner cylinder. The output assembly is rotatably mounted in the mounting outer cylinder. The rotating cooling impeller is rotatably mounted in the connecting inner cylinder.

[0007] As a further improvement of the present invention, a sealing rotating groove is concavely provided in the middle of the inner wall of the connecting inner cylinder, and a plurality of air inlet grooves are concavely provided at intervals along the circumferential direction on the inner wall of the sealing rotating groove.

[0008] As a further improvement of the present invention, the input assembly includes an input connecting rotating plate, an input sealing cover, an input bearing and an input gear element. The outer wall of the input connecting rotating plate is rotatably mounted on the inner side of the inner wall of the connecting inner cylinder. Two first planetary rotating holes are concavely provided in the middle of the outer side of the input connecting rotating plate. A plurality of communication holes are concavely provided at intervals along the circumferential direction on the outer edge of the outer side of the input connecting rotating plate. A plurality of liquid guiding vanes are convexly provided at intervals along the circumferential direction on the outer edge of the outer side of the input connecting rotating plate. The plurality of liquid guiding vanes are respectively arranged opposite to the plurality of communication holes. A first mounting rotating hole is concavely provided in the middle of the outer side of the input connecting rotating plate. The input sealing cover is mounted inside the first mounting rotating hole. An input sealing rotating hole is concavely provided in the middle of the side wall of the input sealing cover. The outer wall of the input bearing is mounted on the outer side of the inner wall of the first mounting rotating hole. The input gear element is mounted in the input connecting rotating plate.

[0009] As a further improvement of the present invention, the input gear element includes an input rotating shaft, an input sun gear and an elastic sealing sleeve. The middle of the input rotating shaft is mounted in the rotating input sealing hole. The outer end of the input rotating shaft is mounted in the input bearing, and the inner end of the input rotating shaft is connected to the output shaft of the steering motor. A cooling connecting ring is convexly provided at the inner end of the outer wall of the input rotating shaft. The inner side of the input sun gear is mounted on the outer side of the input rotating shaft, and an output mounting hole is concavely provided in the middle of the outer side of the input sun gear. An output mounting bearing is arranged in the output mounting hole. The inner side of the elastic sealing sleeve is mounted in the middle of the outer side of the input sun gear.

[0010] As a further improvement of the present invention, the output component includes an output connection rotating plate, an output sealing rotating cover, an output bearing, two planetary gear elements and an output gear element. The inner wall of the output connection rotating plate is rotatably installed on the outer side of the inner wall of the installation outer cylinder. A second installation rotating hole is recessed in the middle of the outer side of the output connection rotating plate. Two second planetary rotating holes are recessed in the inner side of the output connection rotating plate, and the two second planetary rotating holes are respectively arranged opposite to the two first planetary rotating holes. The output sealing rotating cover is installed on the outer side of the second installation rotating hole. An output sealing hole is recessed in the middle of the outer side of the output sealing rotating cover. The output bearing is installed on the inner side of the second installation rotating hole. The two ends of the two planetary gear elements are respectively rotatably installed in the two second planetary rotating holes and the two first planetary rotating holes. The output gear element is rotatably installed in the output connection rotating plate.

[0011] As a further improvement of the present invention, each planetary gear element includes a gear rotating shaft, two planetary gears, a bearing retaining ring and a communication pipe. The outer end of the gear rotating shaft is rotatably installed in the second installation rotating hole, and the inner end of the gear rotating shaft is rotatably installed in the first planetary rotating hole. The two planetary gears are respectively installed at both ends of the outer wall of the gear rotating shaft, and the planetary gear located inside the installation outer cylinder is meshed and connected with the input sun gear. The two sides of the bearing retaining ring are respectively installed in the middle of the inner sides of the two planetary gears. A plurality of first communication holes are recessed at intervals along the circumferential direction on the outer wall of the bearing retaining ring. A plurality of second communication holes are recessed at intervals along the circumferential direction in the middle of the outer wall of the gear rotating shaft. An outflow hole is recessed in the inner end of the gear rotating shaft, and the outflow hole is communicated with the plurality of second communication holes. The outer end of the communication pipe is installed at the inner end of the gear rotating shaft, and a plurality of diffusing blades are arranged at intervals along the circumferential direction at the inner end of the outer wall of the communication pipe.

[0012] As a further improvement of the present invention, the output gear element includes an output gear sleeve, an output gear ring, an output connecting shaft and an output threaded post. The outer end of the output gear sleeve is installed in the output sealing hole. The middle of the outer wall of the output gear sleeve is connected with the inner wall of the output bearing. The outer side of the output gear ring is installed at the outer edge of the inner side of the output connection rotating plate. The outer wall of the output gear ring is rotatably installed on the outer side of the inner wall of the installation outer cylinder, and the output gear ring is meshed and connected with the planetary gear located outside the installation outer cylinder. The inner side of the outer wall of the output connecting shaft is installed in the output installation bearing, and the outer side of the outer wall of the output connecting shaft is installed in the output gear sleeve. The inner side of the output threaded post is installed on the outer side of the output connecting shaft. A threaded rotating groove is recessed on the outer side of the output threaded post. The output threaded post is threadedly connected with the regulating threaded cylinder through the threaded rotating groove.

[0013] As a further improvement of the present invention, the diameter of the elastic sealing sleeve gradually decreases from the inside to the outside, and the outer side of the elastic sealing sleeve rotatably abuts against the outer edge of the inner end of the output gear sleeve. A plurality of elastic rotating blades are convexly arranged at intervals along the circumferential direction on the outer wall of the elastic sealing sleeve. A plurality of hard arc-shaped pieces are convexly arranged at intervals along the circumferential direction in the middle of the outer wall of the elastic sealing sleeve. The plurality of hard arc-shaped pieces are respectively arranged opposite to the plurality of elastic rotating blades, and the outer edge of the hard arc-shaped piece abuts against the middle of the inner wall of the elastic rotating blade.

[0014] As a further improvement of the present invention, a concave impeller mounting hole is provided in the middle of the side wall of the rotating cooling impeller. The inner wall of the impeller mounting hole is connected to the cooling connection ring. The outer wall of the rotating cooling impeller is rotatably mounted on the inner wall of the sealing rotating groove. A conical guide cylinder is convexly provided inside the rotating cooling impeller, and an inclined diffusing surface is formed between the inner side of the conical guide cylinder and the inner side of the rotating cooling impeller. A plurality of spiral air guiding grooves are recessed at intervals along the circumferential direction on the outer wall of the rotating cooling impeller, and the plurality of spiral air guiding grooves are all communicated with the inner side of the inner cavity of the connecting inner cylinder.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. This case can intelligently adjust the output power of the steering motor according to key parameters such as the rotation speed, angle of the steering wheel, and vehicle driving speed, ensuring appropriate steering assistance under different driving conditions, and ensuring the sensitivity and accuracy of steering, avoiding unnecessary energy consumption, and improving the comfort, safety, accuracy, and energy saving of driving.

[0017] 2. This case utilizes the suction of external cooling air and ensures the uniform and rapid flow of the cooling lubricating fluid. Through the combination of the two, it realizes the rapid cooling of the steering motor, quickly reduces the working temperature of the steering motor, prevents overheating, and ensures the stable working state of the steering motor under various working conditions.

[0018] 3. When the vehicle is driving on an uneven road surface and vibrates, this case can evenly transfer the vibration to the housing assembly and the output assembly, and utilize the circulating cooling lubricating fluid to effectively absorb these vibrations, reducing the impact of the vibration of the driving ground on the steering system, thereby improving the stability and comfort of the system; in addition, when the driver makes a sharp turn or quickly adjusts the direction, resulting in the rapid start of the steering motor and thus generating instantaneous force and vibration, the input assembly and the output assembly cooperate to absorb the vibration and transfer the vibration to the cooling lubricating fluid for absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention.

[0020] Figure 2 It is a three-dimensional schematic diagram of a steering bridge, a steering motor, and a connecting transmission device in an embodiment of the present invention.

[0021] Figure 3 It is a broken view of an embodiment of the present invention.

[0022] Figure 4 It is a three-dimensional schematic diagram of a connecting transmission device in an embodiment of the present invention.

[0023] Figure 5Internal schematic diagram of the connection and transmission device in an embodiment of the present invention.

[0024] Figure 6 Internal schematic diagram of the input component and the output component in an embodiment of the present invention.

[0025] Figure 7 Three-dimensional schematic diagram of the elastic sealing sleeve in an embodiment of the present invention.

[0026] Figure 8 Internal schematic diagram of connecting the inner cylinder, the input component and the rotating cooling impeller in an embodiment of the present invention.

[0027] Figure 9 Internal schematic diagram of the rotating cooling impeller in an embodiment of the present invention.

[0028] In the figure:

[0029] 10. Steering axle; 20. Steering motor; 21. Output shaft; 30. Proportional potentiometer; 11. Steering knuckle; 12. Wheel hub; 13. Steering knuckle arm; 14. Steering tie rod; 15. Regulation screw barrel; 40. Connection and transmission device; 50. Housing assembly; 51. Connecting inner cylinder; 52. Mounting outer cylinder; 511. Outer cylinder mounting ring; 512. Sealed rotating groove; 513. Air inlet groove; 60. Input component; 61. Input connecting rotating plate; 62. Input sealing cover; 63. Input bearing; 64. Input gear element; 612. First planetary rotating hole; 613. Communication hole; 614. Liquid guiding blade; 611. First mounting rotating hole; 621. Input sealing hole; 641. Input rotating shaft; 642. Input sun gear; 643. Elastic sealing sleeve; 644. Cooling connection ring; 645. Output mounting hole; 646. Output mounting bearing; 647. Elastic rotating blade; 648. Hard arc-shaped piece; 70. Output component; 71. Output connecting rotating plate; 72. Output sealing cover; 73. Output bearing; 74. Planetary gear element; 75. Output gear element; 711. Second mounting hole; 712. Second planetary rotating hole; 721. Output sealing hole; 741. Gear rotating shaft; 742. Planetary gear; 743. Bearing retaining ring; 744. Connecting pipe; 745. First communication hole; 746. Second communication hole; 747. Outflow hole; 748. Diffusing blade; 751. Output gear sleeve; 752. Output gear ring; 753. Output connecting shaft; 754. Output threaded post; 756. Threaded rotating groove; 80. Rotating cooling impeller; 81. Impeller mounting hole; 82. Conical guide cylinder; 83. Inclined diffusing surface; 84. Spiral air guiding groove. Detailed implementation manners

[0030] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] Please refer to Figures 1 to 9 , an electric power steering system, comprising a steering axle 10, two steering motors 20, a steering wheel and a proportional potentiometer 30. The two steering motors 20 are symmetrically arranged at both ends of the middle part inside the steering axle 10 respectively to drive the steering axle 10 to perform positioning steering. The proportional potentiometer 30 is installed in the steering wheel and electrically connected thereto. The proportional potentiometer 30 is electrically connected to the two steering motors 20 respectively to control the two steering motors 20 according to the rotation amplitude of the steering wheel.

[0034] At both ends of one side of the steering axle 10, steering knuckles 11 protrude inward respectively. A hub 12 is rotatably arranged at the outer end of each steering knuckle 11. A steering knuckle arm 13 protrudes from the inner end of the steering knuckle 11. The inner end of the steering knuckle arm 13 is rotatably provided with a steering tie rod 14, and a regulating threaded cylinder 15 is arranged at the inner end of the steering tie rod 14; at the outer end of each steering motor 20, a connecting transmission device 40 is provided. Each connecting transmission device 40 includes a housing assembly 50, an input assembly 60, an output assembly 70 and a rotating cooling impeller 80. The housing assembly 50 includes a connecting inner cylinder 51 and a mounting outer cylinder 52. The inner side of the connecting inner cylinder 51 is mounted on the outer edge of the outer side of the steering motor 20. An outer cylinder mounting ring 511 protrudes from the outer side of the connecting inner cylinder 51. The inner side of the mounting outer cylinder 52 is mounted in the outer cylinder mounting ring 511. The input assembly 60 is rotatably mounted in the connecting inner cylinder 51. The output assembly 70 is rotatably mounted in the mounting outer cylinder 52. The rotating cooling impeller 80 is rotatably mounted in the connecting inner cylinder 51.

[0035] A sealing rotation groove 512 is recessed in the middle of the inner wall of the connecting inner cylinder 51, and a plurality of air inlet grooves 513 are recessed in the inner wall of the sealing rotation groove 512 at intervals in the circumferential direction.

[0036] The input component 60 includes an input connection rotating plate 61, an input sealing cover 62, an input bearing 63 and an input gear element 64. The outer wall of the input connection rotating plate 61 is rotatably installed on the inner side of the inner wall of the connecting inner cylinder 51. Two first planetary rotation holes 612 are recessed in the middle of the outer side of the input connection rotating plate 61. A plurality of communication holes 613 are recessed at intervals in the circumferential direction on the outer edge of the outer side of the input connection rotating plate 61. A plurality of liquid guiding vanes 614 are protruded at intervals in the circumferential direction on the outer edge of the outer side of the input connection rotating plate 61. The plurality of liquid guiding vanes 614 are respectively arranged opposite to the plurality of communication holes 613. A first installation rotation hole 611 is recessed in the middle of the outer side of the input connection rotating plate 61. The input sealing cover 62 is installed inside the first installation rotation hole 611. An input sealing rotation hole 621 is recessed in the middle of the side wall of the input sealing cover 62. The outer wall of the input bearing 63 is installed on the outer side of the inner wall of the first installation rotation hole 611. The input gear element 64 is installed in the input connection rotating plate 61.

[0037] The input gear element 64 includes an input rotating shaft 641, an input sun gear 642 and an elastic sealing sleeve 643. The middle of the input rotating shaft 641 is installed in the rotating input sealing rotation hole 621. The outer end of the input rotating shaft 641 is installed in the input bearing 63, and the inner end of the input rotating shaft 641 is connected to the output shaft 21 of the steering motor 20. A cooling connection ring 644 is protruded at the inner end of the outer wall of the input rotating shaft 641. The inner side of the input sun gear 642 is installed on the outer side of the input rotating shaft 641, and an output installation rotation hole 645 is recessed in the middle of the outer side of the input sun gear 642. An output installation bearing 646 is arranged in the output installation rotation hole 645. The inner side of the elastic sealing sleeve 643 is installed in the middle of the outer side of the input sun gear 642.

[0038] The output component 70 includes an output connection rotating plate 71, an output sealing cover 72, an output bearing 73, two planetary gear elements 74 and an output gear element 75. The inner wall of the output connection rotating plate 71 is rotatably installed on the outer side of the inner wall of the installation outer cylinder 52. A second installation rotation hole 711 is recessed in the middle of the outer side of the output connection rotating plate 71. Two second planetary rotation holes 712 are recessed on the inner side of the output connection rotating plate 71, and the two second planetary rotation holes 712 are respectively arranged opposite to the two first planetary rotation holes 612. The output sealing cover 72 is installed on the outer side of the second installation rotation hole 711. An output sealing hole 721 is recessed in the middle of the outer side of the output sealing cover 72. The output bearing 73 is installed inside the second installation rotation hole 711. The two ends of the two planetary gear elements 74 are respectively rotatably installed in the two second planetary rotation holes 712 and the two first planetary rotation holes 612. The output gear element 75 is rotatably installed in the output connection rotating plate 71.

[0039] Each planetary gear element 74 includes a gear rotating shaft 741, two planetary gears 742, a bearing retaining ring 743 and a connecting pipe 744. The outer end of the gear rotating shaft 741 is rotatably installed in the second installation rotating hole 711, and the inner end of the gear rotating shaft 741 is rotatably installed in the first planetary rotating hole 612. The two planetary gears 742 are respectively installed at both ends of the outer wall of the gear rotating shaft 741, and the planetary gear 742 located inside the installation outer cylinder 52 is meshed and connected with the input sun gear 642. The two sides of the bearing retaining ring 743 are respectively installed in the middle of the inner sides of the two planetary gears 742. A plurality of first communication holes 745 are recessed at intervals along the circumferential direction on the outer wall of the bearing retaining ring 743. A plurality of second communication holes 746 are recessed at intervals along the circumferential direction in the middle of the outer wall of the gear rotating shaft 741. An outflow hole 747 is recessed at the inner end of the gear rotating shaft 741, and the outflow hole 747 is communicated with a plurality of second communication holes 746. The outer end of the connecting pipe 744 is installed at the inner end of the gear rotating shaft 741, and a plurality of diffusing vanes 748 are arranged at intervals along the circumferential direction at the inner end of the outer wall of the connecting pipe 744.

[0040] The output gear element 75 includes an output gear sleeve 751, an output gear ring 752, an output connecting shaft 753 and an output threaded post 754. The outer end of the output gear sleeve 751 is installed in the output sealing hole 721. The middle of the outer wall of the output gear sleeve 751 is connected with the inner wall of the output bearing 73. The outer side of the output gear ring 752 is installed at the outer edge of the inner side of the output connecting plate 71. The outer wall of the output gear ring 752 is rotatably installed on the outer side of the inner wall of the installation outer cylinder 52, and the output gear ring 752 is meshed and connected with the planetary gear 742 located outside the installation outer cylinder 52. The inner side of the outer wall of the output connecting shaft 753 is installed in the output installation bearing 646, and the outer side of the outer wall of the output connecting shaft 753 is installed in the output gear sleeve 751. The inner side of the output threaded post 754 is installed on the outer side of the output connecting shaft 753. A threaded rotating groove 756 is recessed on the outer side of the output threaded post 754, and the output threaded post 754 is threadedly connected with the regulating threaded cylinder 15 through the threaded rotating groove 756.

[0041] The diameter of the elastic closing sleeve 643 gradually decreases from the inside to the outside, and the outer side of the elastic closing sleeve 643 rotatably abuts against the outer edge of the inner end of the output gear sleeve 751. A plurality of elastic rotating blades 647 are convexly arranged at intervals along the circumferential direction on the outer wall of the elastic closing sleeve 643. A plurality of rigid arc-shaped pieces 648 are convexly arranged at intervals along the circumferential direction in the middle of the outer wall of the elastic closing sleeve 643. The plurality of rigid arc-shaped pieces 648 are respectively arranged opposite to the plurality of elastic rotating blades 647, and the outer edge of the rigid arc-shaped piece 648 abuts against the middle of the inner wall of the elastic rotating blade 647.

[0042] In the middle of the side wall of the rotating cooling impeller 80, an impeller mounting hole 81 is recessed. The inner wall of the impeller mounting hole 81 is connected to the cooling connection ring 644. The outer wall of the rotating cooling impeller 80 is rotatably mounted on the inner wall of the sealing rotating groove 512. A conical guide cylinder 82 protrudes from the inner side of the rotating cooling impeller 80, and an inclined diffusing surface 83 is formed between the inner side of the conical guide cylinder 82 and the inner side of the rotating cooling impeller 80. A plurality of spiral air guiding grooves 84 are recessed at intervals along the circumferential direction on the outer wall of the rotating cooling impeller 80, and the plurality of spiral air guiding grooves 84 are all communicated with the inner side of the inner cavity of the connecting inner cylinder 51.

[0043] For example, in an embodiment: a coolant filling hole is recessed in the outer wall of the mounting outer cylinder 52, so that the cooling lubricant can be filled through the coolant filling hole and filled in the inner cavity of the mounting outer cylinder 52 and the outer side of the inner cavity of the connecting inner cylinder 51 before operation. A plurality of temperature equalizing outflow grooves are recessed at intervals along the circumferential direction on the inner side of the connecting inner cylinder 51. The rotating cooling impeller 80 is made of a heat-conducting material.

[0044] For example, in an embodiment: a sensor and a microprocessor are arranged in the steering motor 20, and both the sensor and the microprocessor are electrically connected to the proportional potentiometer 30 to monitor key parameters such as the rotation speed, angle of the steering wheel and the vehicle driving speed in real time, and accurately adjust the output power of the steering motor 20 according to these data, so as to realize the intelligent distribution of steering assist.

[0045] For example, in an embodiment: when steering is required, turn the steering wheel, and the proportional potentiometer 30 will identify the rotation angle and speed of turning the steering wheel and send a signal to the two steering motors 20, so that the two steering motors 20 are started, and the output shafts 21 of the steering motors 20 rotate, and then drive the input rotating shaft 641 and the input sun gear 642 to rotate accordingly, and then make the two planetary gears 742 located inside the mounting outer cylinder 52 rotate accordingly, and then make the two planetary gear elements 74 rotate accordingly. Also, since the output gear ring 752 is installed on the outer side of the inner wall of the mounting outer cylinder 52, and the outer side of the output gear ring 752 is installed on the outer edge of the inner side of the output connecting rotating plate 71, the outer wall of the output gear ring 752 is rotatably installed on the outer side of the inner wall of the mounting outer cylinder 52, and the output gear ring 752 is meshed with the planetary gear 742 located outside the mounting outer cylinder 52, and then the power is transmitted to the output gear ring 752, so that the output gear ring 752 rotates, and the input connecting rotating plate 61, the output connecting rotating plate 71 and the elastic sealing sleeve 643 rotate accordingly. Also, since the outer end of the output gear sleeve 751 is installed in the output sealing hole 721, the output connecting shaft 753 and the output threaded column 754 will rotate accordingly. Also, since the output threaded column 754 is threadedly connected to the regulating threaded cylinder 15 through the threaded groove 756, the regulating threaded cylinder 15 will move horizontally, and then push and pull the steering knuckle arm 13, so as to achieve the effect of power-assisted steering.

[0046] For example, in one embodiment: when the input rotating shaft 641 rotates, since the inner wall of the impeller mounting hole 81 is connected to the cooling connection ring 644, the rotating cooling impeller 80 will be caused to rotate, and then a plurality of spiral air guiding grooves 84 therein will follow the rotation, thereby sucking the external air, and sucking the externally cooled air through a plurality of air inlet grooves 513 into the plurality of spiral air guiding grooves 84, and flowing out from the inner sides of the plurality of spiral air guiding grooves 84, directly cooling and impacting the outer side of the steering motor 20, and flowing out from a plurality of temperature equalizing outflow grooves after the impact. And when the two planetary gear elements 74, the input connecting rotating plate 61 and the input rotating shaft 641 rotate, since the inner side of the elastic sealing sleeve 643 is mounted on the outer middle part of the input sun gear 642, and a plurality of elastic rotating blades 647 are circumferentially and spacedly protruded from the outer wall of the elastic sealing sleeve 643, then when the elastic sealing sleeve 643 rotates, the plurality of elastic rotating blades 647 will follow the rotation to accelerate the flow of the cooling lubricating fluid in the inner cavity of the mounting outer cylinder 52, and send a part of the cooling lubricating fluid to the two planetary gear elements 74, and after passing through a plurality of first communication holes 745, a plurality of second communication holes 746, the outflow holes 747 and the inner cavity of the connecting pipe 744, it is ejected from the inner end of the connecting pipe 744 onto the side wall outside the conical guide cylinder 82, and is guided by the side wall outside the conical guide cylinder 82 and the inclined diffusing surface 83 to flow towards the outer edge of the inner cavity of the connecting inner cylinder 51, and then flows back into the inner cavity of the mounting outer cylinder 52 through a plurality of communication holes 613. Since the plurality of liquid guiding blades 614 are respectively arranged opposite to the plurality of communication holes 613, when the input connecting rotating plate 61 rotates, the flow of the cooling lubricating fluid flowing back will also be accelerated, thereby ensuring the temperature uniformity of the whole device. In addition, when the inner end of the connecting pipe 744 is ejected onto the side wall outside the conical guide cylinder 82, since it is made of a heat-conducting material, it can further cool the cooling air inhaled from the outside, ensuring the cooling intensity of the steering motor 20.

[0047] For example, in one embodiment: when a vehicle is traveling on an uneven road surface and the ground impact is transmitted through the wheels to the steering system and then to the output connecting shaft 753 and the output threaded post 754, the output threaded post 754 evenly transmits the vibration to the output connecting rotating plate 71, the output sealing cover 72 and the output bearing 73. At this time, the circulating flow of the cooling lubricating fluid can absorb the vibration, thereby achieving the purpose of shock absorption.

[0048] When the driver suddenly operates the steering, such as making a sharp turn or quickly adjusting the direction, the steering motor 20 suddenly starts quickly, generating instantaneous force and vibration. The vibration is transmitted through the output shaft 21 to the input rotating shaft 641 and the elastic sealing sleeve 643. Since the diameter of the elastic sealing sleeve 643 gradually decreases from inside to outside, and the outer side of the elastic sealing sleeve 643 rotates and abuts against the outer edge of the inner end of the output gear sleeve 751, when vibrating, it will cause the elastic sealing sleeve 643 to deform, causing the elastic sealing sleeve 643 to expand and deform, absorbing the vibration. At the same time, when the elastic sealing sleeve 643 expands and deforms, it will cause multiple elastic rotating blades 647 to deform accordingly, and cause multiple hard arc-shaped pieces 648 to expand outwards. And because the outer edge of the hard arc-shaped piece 648 abuts against the middle part of the inner wall of the elastic rotating blade 647, multiple elastic rotating blades 647 will follow and unfold, increasing the rotational diffusion force of the cooling lubricant when rotating and accelerating the flow rate of the cooling lubricant.

[0049] Installation process: The two steering motors 20 are symmetrically arranged at both ends of the middle part inside the steering axle 10 respectively. The proportional potentiometer 30 is installed in the steering wheel and electrically connected thereto. The proportional potentiometer 30 is electrically connected to the two steering motors 20 respectively. The inner side of the connecting inner cylinder 51 is installed on the outer edge of the outer side of the steering motor 20. The inner side of the installation outer cylinder 52 is installed in the outer cylinder installation ring 511. The outer wall of the input connecting rotating plate 61 is rotatably installed on the inner side of the inner wall of the connecting inner cylinder 51. The input sealing cover 62 is installed inside the first installation rotating hole 611. The outer wall of the input bearing 63 is installed on the outer side of the inner wall of the first installation rotating hole 611. The middle part of the input rotating shaft 641 is installed in the rotating input sealing hole 621. The outer end of the input rotating shaft 641 is installed in the input bearing 63, and the inner end of the input rotating shaft 641 is connected to the output shaft 21 of the steering motor 20. The inner side of the input sun gear 642 is installed on the outer side of the input rotating shaft 641. The inner side of the elastic sealing sleeve 643 is installed in the middle part of the outer side of the input sun gear 642. The inner wall of the output connecting rotating plate 71 is rotatably installed on the outer side of the inner wall of the installation outer cylinder 52. The output sealing cover 72 is installed outside the second installation rotating hole 711. The output bearing 73 is installed inside the second installation rotating hole 711. The outer end of the gear rotating shaft 741 is rotatably installed in the second installation rotating hole 711. The inner end of the gear rotating shaft 741 is rotatably installed in the first planetary rotating hole 612. The two planetary gears 742 are respectively installed at both ends of the outer wall of the gear rotating shaft 741, and the planetary gear 742 located inside the installation outer cylinder 52 is meshed and connected with the input sun gear 642. Both sides of the bearing retaining ring 743 are installed in the middle parts of the inner sides of the two planetary gears 742. The outer end of the communicating pipe 744 is installed at the inner end of the gear rotating shaft 741. The outer end of the output gear sleeve 751 is installed in the output sealing hole 721. The middle part of the outer wall of the output gear sleeve 751 is connected to the inner wall of the output bearing 73. The outer side of the output gear ring 752 is installed on the outer edge of the inner side of the output connecting rotating plate 71. The outer wall of the output gear ring 752 is rotatably installed on the outer side of the inner wall of the installation outer cylinder 52, and the output gear ring 752 is meshed and connected with the planetary gear 742 located outside the installation outer cylinder 52. The inner side of the outer wall of the output connecting shaft 753 is installed in the output installation bearing 646. The outer side of the outer wall of the output connecting shaft 753 is installed in the output gear sleeve 751, and the outer side of the elastic sealing sleeve 643 is rotationally abutted against the outer edge of the inner end of the output gear sleeve 751. The inner side of the output threaded column 754 is installed on the outer side of the output connecting shaft 753. The output threaded column 754 is threadedly connected to the regulating threaded cylinder 15 through the thread groove 756. The inner wall of the impeller installation hole 81 is connected to the cooling connecting ring 644. The outer wall of the rotating cooling impeller 80 is rotatably installed on the inner wall of the sealing rotating groove 512, and a plurality of spiral air guiding grooves 84 are all communicated with the inner side of the inner cavity of the connecting inner cylinder 51.

[0050] The above-described embodiments merely represent several embodiments of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. An electric power steering system, characterized in that: It includes a steering axle (10), two steering motors (20), a steering wheel and a proportional potentiometer (30). The two steering motors (20) are symmetrically arranged at both ends of the middle part inside the steering axle (10) respectively to drive the steering axle (10) for positioning steering. The proportional potentiometer (30) is installed in the steering wheel and electrically connected thereto. The proportional potentiometer (30) is electrically connected to the two steering motors (20) respectively to control the two steering motors (20) according to the rotation amplitude of the steering wheel. At both ends of one side of the steering axle (10), steering knuckles (11) protrude inward respectively. A hub (12) is rotatably arranged at the outer end of each steering knuckle (11). A steering knuckle arm (13) protrudes from the inner end of the steering knuckle (11). The inner end of the steering knuckle arm (13) is rotatably provided with a steering tie rod (14). The inner end of the steering tie rod (14) is provided with a regulating screw cylinder (15). At the outer end of each steering motor (20), a connecting transmission device (40) is provided. Each connecting transmission device (40) includes a housing assembly (50), an input assembly (60), an output assembly (70) and a rotating cooling impeller (80). The housing assembly (50) includes a connecting inner cylinder (51) and an installation outer cylinder (52). The inner side of the connecting inner cylinder (51) is installed on the outer edge of the outer side of the steering motor (20). An outer cylinder mounting ring (511) protrudes from the outer side of the connecting inner cylinder (51). The inner side of the installation outer cylinder (52) is installed in the outer cylinder mounting ring (511). The input assembly (60) is rotatably installed in the connecting inner cylinder (51). The output assembly (70) is rotatably installed in the installation outer cylinder (52). The rotating cooling impeller (80) is rotatably installed in the connecting inner cylinder (51). The input assembly (60) includes an input connecting rotating plate (61), an input sealing cover (62), an input bearing (63) and an input gear element (64). The outer wall of the input connecting rotating plate (61) is rotatably installed on the inner side of the inner wall of the connecting inner cylinder (51). Two first planetary rotating holes (612) are recessed in the middle of the outer side of the input connecting rotating plate (61). A plurality of communication holes (613) are recessed at intervals along the circumferential direction on the outer edge of the outer side of the input connecting rotating plate (61). A plurality of liquid guiding vanes (614) protrude at intervals along the circumferential direction on the outer edge of the outer side of the input connecting rotating plate (61). The plurality of liquid guiding vanes (614) are respectively arranged opposite to the plurality of communication holes (613). A first installation rotating hole (611) is recessed in the middle of the outer side of the input connecting rotating plate (61). The input sealing cover (62) is installed inside the first installation rotating hole (611). An input sealing rotating hole (621) is recessed in the middle of the side wall of the input sealing cover (62). The outer wall of the input bearing (63) is installed on the outer side of the inner wall of the first installation rotating hole (611). The input gear element (64) is installed in the input connecting rotating plate (61).

2. The electric power steering system according to claim 1, characterized in that: A sealing rotating groove (512) is recessed in the middle of the inner wall of the connecting inner cylinder (51). A plurality of air inlet grooves (513) are recessed at intervals along the circumferential direction on the inner wall of the sealing rotating groove (512).

3. The electric power steering system according to claim 2, wherein: The input gear element (64) includes an input rotating shaft (641), an input sun gear (642) and an elastic sealing sleeve (643). The middle part of the input rotating shaft (641) is installed in the rotating input sealing hole (621), the outer end of the input rotating shaft (641) is installed in the input bearing (63), and the inner end of the input rotating shaft (641) is connected to the output shaft (21) of the steering motor (20). A cooling connection ring (644) is convexly provided at the inner end of the outer wall of the input rotating shaft (641). The inner side of the input sun gear (642) is installed on the outer side of the input rotating shaft (641), and a concave output installation hole (645) is provided in the middle of the outer side of the input sun gear (642). An output installation bearing (646) is arranged in the output installation hole (645). The inner side of the elastic sealing sleeve (643) is installed in the middle of the outer side of the input sun gear (642).

4. The electric power steering system according to claim 3, characterized in that: The output assembly (70) includes an output connection rotating plate (71), an output sealing cover (72), an output bearing (73), two planetary gear elements (74) and an output gear element (75). The inner wall of the output connection rotating plate (71) is rotatably installed on the outer side of the inner wall of the installation outer cylinder (52). A second installation hole (711) is concavely provided in the middle of the outer side of the output connection rotating plate (71). Two second planetary holes (712) are concavely provided on the inner side of the output connection rotating plate (71), and the two second planetary holes (712) are respectively arranged opposite to the two first planetary holes (612). The output sealing cover (72) is installed on the outer side of the second installation hole (711). An output sealing hole (721) is concavely provided in the middle of the outer side of the output sealing cover (72). The output bearing (73) is installed on the inner side of the second installation hole (711). The two ends of the two planetary gear elements (74) are respectively rotatably installed in the two second planetary holes (712) and the two first planetary holes (612). The output gear element (75) is rotatably installed in the output connection rotating plate (71).

5. The electric power steering system according to claim 4, wherein: Each planetary gear element (74) includes a gear rotating shaft (741), two planetary gears (742), a bearing retaining ring (743) and a connecting pipe (744). The outer end of the gear rotating shaft (741) is rotatably installed in the second installation rotating hole (711), and the inner end of the gear rotating shaft (741) is rotatably installed in the first planetary rotating hole (612). The two planetary gears (742) are respectively installed at both ends of the outer wall of the gear rotating shaft (741), and the planetary gear (742) located inside the installation outer cylinder (52) is meshed and connected with the input sun gear (642). The two sides of the bearing retaining ring (743) are respectively installed in the middle of the inner sides of the two planetary gears (742). A plurality of first communication holes (745) are recessed at intervals along the circumferential direction on the outer wall of the bearing retaining ring (743). A plurality of second communication holes (746) are recessed at intervals along the circumferential direction in the middle of the outer wall of the gear rotating shaft (741). An outflow hole (747) is recessed at the inner end of the gear rotating shaft (741), and the outflow hole (747) is communicated with a plurality of second communication holes (746). The outer end of the connecting pipe (744) is installed at the inner end of the gear rotating shaft (741), and a plurality of diffusing vanes (748) are arranged at intervals along the circumferential direction at the inner end of the outer wall of the connecting pipe (744).

6. The electric power steering system according to claim 5, characterized in that: The output gear element (75) includes an output gear sleeve (751), an output gear ring (752), an output connecting shaft (753) and an output threaded post (754). The outer end of the output gear sleeve (751) is installed in the output sealing hole (721). The middle of the outer wall of the output gear sleeve (751) is connected with the inner wall of the output bearing (73). The outer side of the output gear ring (752) is installed at the outer edge of the inner side of the output connecting plate (71). The outer wall of the output gear ring (752) is rotatably installed on the outer side of the inner wall of the installation outer cylinder (52), and the output gear ring (752) is meshed and connected with the planetary gear (742) located outside the installation outer cylinder (52). The inner side of the outer wall of the output connecting shaft (753) is installed in the output installation bearing (646). The outer side of the outer wall of the output connecting shaft (753) is installed in the output gear sleeve (751). The inner side of the output threaded post (754) is installed on the outer side of the output connecting shaft (753). A threaded rotating groove (756) is recessed on the outer side of the output threaded post (754). The output threaded post (754) is threadedly connected with the regulating threaded cylinder (15) through the threaded rotating groove (756).

7. The electric power steering system according to claim 6, characterized in that: The diameter of the elastic sealing sleeve (643) gradually decreases from the inside to the outside, and the outer side of the elastic sealing sleeve (643) is rotatably abutted against the outer edge of the inner end of the output gear sleeve (751). A plurality of elastic rotating blades (647) are convexly provided at intervals along the circumferential direction on the outer wall of the elastic sealing sleeve (643). A plurality of rigid arc-shaped pieces (648) are convexly provided at intervals along the circumferential direction in the middle of the outer wall of the elastic sealing sleeve (643). The plurality of rigid arc-shaped pieces (648) are respectively arranged opposite to the plurality of elastic rotating blades (647), and the outer edge of the rigid arc-shaped piece (648) abuts against the middle of the inner wall of the elastic rotating blade (647).

8. The electric power steering system according to claim 7, characterized in that: The middle part of the side wall of the rotating cooling impeller (80) is recessed with an impeller mounting hole (81). The inner wall of the impeller mounting hole (81) is connected to the cooling connection ring (644). The outer wall of the rotating cooling impeller (80) is rotatably mounted on the inner wall of the sealing rotating groove (512). The inner side of the rotating cooling impeller (80) is convex with a conical guide cylinder (82), and an inclined diffusing surface (83) is formed between the inner side of the conical guide cylinder (82) and the inner side of the rotating cooling impeller (80). The outer wall of the rotating cooling impeller (80) is recessed with a plurality of spiral air guiding grooves (84) at intervals along the circumferential direction, and the plurality of spiral air guiding grooves (84) are all communicated with the inner side of the inner cavity of the connecting inner cylinder (51).

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