Electric power steering system

Abstract

The invention relates to the technical field of steering systems, in particular to an electric power steering system. The electric power steering system comprises a steering axle, two steering motors, a steering wheel and a proportional potentiometer. The output power of the steering motor can be intelligently adjusted according to key parameters such as the rotating speed and angle of the steering wheel and the vehicle running speed, it is ensured that under different driving conditions, proper steering assistance is provided, steering sensitivity and accuracy are ensured, unnecessary energy consumption is avoided, and the driving safety is improved. In addition, external cooling air can be sucked, uniform and rapid flowing of cooling lubricating liquid can be ensured, rapid cooling of the steering motor is achieved through combination of the external cooling air and the cooling lubricating liquid, the working temperature of the steering motor is rapidly reduced, the overheating phenomenon is prevented, and the service life of the steering motor is prolonged. And the stable working state of the steering motor under various working conditions is ensured.

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] Electric power steering (EPS) is an advanced technology that directly provides steering assistance through an electric motor. Compared with traditional hydraulic power steering systems, electric power steering has higher energy efficiency and flexibility. Its working principle is to use the controller to adjust the current size and direction of the motor in real time according to the vehicle speed and torque signals collected by the sensor, thereby achieving steering assistance.

[0003] However, in electric engineering vehicles (such as electric forklifts, electric shovels, etc.), many steering assist systems are still hydraulically driven, that is, the hydraulic system applies auxiliary force to the steering system by converting the power output of the electric motor into the pressure of the hydraulic pump. Although the hydraulic system performs well in some applications, its overall energy consumption is high, especially in the case of long-term operation, and its 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, which can easily lead to power waste and insensitive steering, thus affecting the accuracy of the control, and also causing the motor and other components to generate a lot of heat, resulting in system performance degradation or 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 technology.

[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 the two ends of the middle part of the inner side of the steering axle to drive the steering axle to perform positioning and steering. The proportional potentiometer is installed in the steering wheel and electrically connected to the steering wheel. 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, steering knuckles are respectively protruded inward at both ends of one side of the steering bridge, a wheel hub is rotatably provided at the outer end of each steering knuckle, a steering knuckle arm is convexly provided at the inner end of the steering knuckle, a steering rod is rotatably provided at the inner end of the steering knuckle arm, and a regulating threaded cylinder is provided at the inner end of the steering rod; a connecting transmission device is provided at the outer end of each steering motor, and each connecting transmission device includes an outer shell assembly, an input assembly, an output assembly and a rotating cooling impeller, the outer shell assembly includes a connecting inner cylinder and an installing outer cylinder, the inner side of the connecting inner cylinder is installed on the outer edge of the outer side of the steering motor, an outer side of the connecting inner cylinder is protruded with an outer cylinder mounting ring, the inner side of the installing outer cylinder is installed in the outer cylinder mounting ring, the input assembly is rotatably installed in the connecting inner cylinder, the output assembly is rotatably installed in the installing outer cylinder, and the rotating cooling impeller is rotatably installed in the connecting inner cylinder.

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

[0008] As a further improvement of the present invention, the input component includes an input connecting rotating plate, an input sealing rotating cover, an input bearing and an input gear element. The outer wall of the input connecting rotating plate is rotatably installed on the inner side of the inner wall of the connecting inner cylinder. Two first planetary rotating holes are recessed in the middle of the outer side of the input connecting rotating plate. The outer edge of the outer side of the input connecting rotating plate is recessed with multiple connecting holes at intervals along the circumferential direction. The outer edge of the outer side of the input connecting rotating plate is protruded with multiple liquid guiding blades at intervals along the circumferential direction. The multiple liquid guiding blades are respectively arranged opposite to the multiple connecting holes. A first mounting rotating hole is recessed in the middle of the outer side of the input connecting rotating plate. The input sealing rotating cover is installed on the inner side of the first mounting rotating hole. The input sealing rotating hole is recessed in the middle of the side wall of the input sealing rotating cover. The outer wall of the input bearing is installed on the outer side of the inner wall of the first mounting rotating hole. The input gear element is installed in the input connecting rotating plate.

[0009] As a further improvement of the present invention, the input gear element includes an input shaft, an input sun gear and an elastic sealing sleeve, the middle part of the input shaft is installed in the rotating input sealing hole, the outer end of the input shaft is installed in the input bearing, and the inner end of the input 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 shaft, the inner side of the input sun gear is installed on the outer side of the input shaft, and an output mounting hole is concavely provided in the middle part of the outer side of the input sun gear, an output mounting hole is provided in the output mounting hole, and the inner side of the elastic sealing sleeve is installed in the middle part of the outer side of the input sun gear.

[0010] As a further improvement of the present invention, the output component includes an output connecting 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 connecting rotating plate is rotatably mounted on the outer side of the inner wall of the mounting outer cylinder. A second mounting rotating hole is recessed in the middle of the outer side of the output connecting rotating plate. Two second planetary rotating holes are recessed on the inner side of the output connecting 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 mounted on the outer side of the second mounting 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 mounted on the inner side of the second mounting rotating hole. The two ends of the two planetary gear elements are respectively rotatably mounted in the two second planetary rotating holes and the two first planetary rotating holes, and the output gear element is rotatably mounted in the output connecting rotating plate.

[0011] As a further improvement of the present invention, each planetary gear element includes a gear shaft, two planetary gears, a bearing retaining ring and a connecting pipe. The outer end of the gear shaft is rotatably installed in the second mounting hole, and the inner end of the gear shaft is rotatably installed in the first planetary hole. The two planetary gears are respectively installed at both ends of the outer wall of the gear shaft, and the planetary gears located on the inner side of the mounting outer cylinder are 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 side of the two planetary gears. The outer wall of the bearing retaining ring is recessed with a plurality of first connecting holes at intervals along the circumferential direction, and the middle part of the outer wall of the gear shaft is recessed with a plurality of second connecting holes at intervals along the circumferential direction. The inner end of the gear shaft is recessed with an outflow hole, which is connected to the plurality of second connecting holes. The outer end of the connecting pipe is installed at the inner end of the gear shaft, and the inner end of the outer wall of the connecting pipe is provided with a plurality of diffuser blades at intervals along the circumferential direction.

[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 column. The outer end of the output gear sleeve is installed in the output sealing hole, the middle part of the outer wall of the output gear sleeve is connected to the inner wall of the output bearing, the outer side of the output gear ring is installed on the outer edge of the inner side of the output connecting rotating plate, the outer wall of the output gear ring is rotatably installed on the outer side of the inner wall of the mounting outer cylinder, and the output gear ring is meshed with the planetary gear located on the outer side of the mounting outer cylinder, the inner side of the outer wall of the output connecting shaft is installed in the output mounting bearing, 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 column is installed on the outer side of the output connecting shaft, a thread rotation groove is recessed on the outer side of the output threaded column, and the output threaded column is threadedly connected to the regulating threaded cylinder through the thread rotation 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 rotates and abuts against the outer edge of the inner end of the output gear sleeve, a plurality of elastic rotating blades are protruded from the outer wall of the elastic sealing sleeve at intervals along the circumferential direction, and a plurality of hard arc-shaped sheets are protruded from the middle part of the outer wall of the elastic sealing sleeve at intervals along the circumferential direction, the plurality of hard arc-shaped sheets are respectively arranged opposite to the plurality of elastic rotating blades, and the outer edges of the hard arc-shaped sheets abut against the middle part of the inner wall of the elastic rotating blade.

[0014] As a further improvement of the present invention, an impeller mounting hole is recessed 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 connecting 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 protruded on the inner side of the rotating cooling impeller, and an inclined dispersion 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 induction grooves are recessed on the outer wall of the rotating cooling impeller at intervals along the circumferential direction, and the plurality of spiral air induction grooves are all connected to the inner side of the internal cavity of the connecting inner cylinder.

[0015] The beneficial effects of the present invention are as follows: 1. This solution can intelligently adjust the output power of the steering motor according to key parameters such as the steering wheel rotation speed, angle and vehicle speed, ensure appropriate steering assistance under different driving conditions, and ensure the sensitivity and accuracy of steering, avoid unnecessary energy consumption, and improve driving comfort, safety, accuracy and energy saving.

[0016] 2. This case utilizes the suction of external cooling air and ensures the uniform and rapid flow of cooling lubricant. Through the combination of the two, the steering motor can be cooled quickly, the operating temperature of the steering motor can be quickly reduced, overheating can be prevented, and the stable working state of the steering motor can be ensured under various working conditions.

[0017] 3. This solution can evenly transfer the vibrations to the housing assembly and the output assembly when the vehicle is traveling on an uneven road surface, and utilize the circulating cooling lubricant to effectively absorb the vibrations, thereby reducing the impact of the vibrations of the driving surface 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, causing the steering motor to start quickly and generate instantaneous force and vibration, the input assembly and the output assembly cooperate to absorb the vibrations, and the vibrations are transferred to the cooling lubricant for absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention.

[0019] Figure 2 It is a three-dimensional schematic diagram of a steering axle, a steering motor and a connecting transmission device in one embodiment of the present invention.

[0020] Figure 3 FIG. 1 is a fracture view of an embodiment of the present invention.

[0021] Figure 4 It is a three-dimensional schematic diagram of a connecting transmission device in one embodiment of the present invention.

[0022] Figure 5 FIG. 1 is an internal schematic diagram of a connecting transmission device in one embodiment of the present invention.

[0023] Figure 6 FIG. 1 is an internal schematic diagram of an input component and an output component in one embodiment of the present invention.

[0024] Figure 7 It is a three-dimensional schematic diagram of an elastic sealing sleeve in one embodiment of the present invention.

[0025] Figure 8 It is an internal schematic diagram of the connection between the inner cylinder, the input assembly and the rotating cooling impeller in one embodiment of the present invention.

[0026] Fig. 9 FIG. 1 is a schematic diagram of the interior of a rotating cooling impeller in one embodiment of the present invention.

[0027] In the figure: 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. Adjusting threaded cylinder; 40. Connecting transmission device; 50. Shell assembly; 51. Connecting inner cylinder; 52. Installing outer cylinder; 511. Installing ring of outer cylinder; 512. Sealing rotating groove; 513. Intake groove; 60. Input assembly; 61. Input connecting rotating plate; 62. Input sealing rotating cover; 63. Input bearing; 64. Input gear element; 612. First planetary rotating hole; 613. Connecting hole; 614. Liquid guide blade; 611. First mounting rotating hole; 621. Input sealing rotating hole; 641. Input rotating shaft; 642. Input sun gear; 643. Elastic sealing sleeve; 644. Cooling connecting ring; 645. Output mounting rotating hole; 646 , output mounting bearing; 647, elastic vane; 648, hard arc-shaped sheet; 70, output assembly; 71, output connecting rotating plate; 72, output sealing rotating cover; 73, output bearing; 74, planetary gear element; 75, output gear element; 711, second mounting rotating 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 connecting hole; 746, second connecting hole; 747, outflow hole; 748, diffuser blade; 751, output gear sleeve; 752, output gear ring; 753, output connecting shaft; 754, output threaded column; 756, threaded rotating groove; 80, rotating cooling impeller; 81, impeller mounting hole; 82, conical guide tube; 83, inclined diffuser surface; 84, spiral air induction groove. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given 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, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0029] In the description of the present invention, it should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art 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.

[0031] See also Figures 1 to 9 An electric power steering system 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 inner middle part of the steering axle 10 to drive the steering axle 10 to perform positioning and steering. The proportional potentiometer 30 is installed in the steering wheel and electrically connected to the steering wheel. 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.

[0032] Steering knuckles 11 are protruded inwardly at both ends of one side of the steering bridge 10, and a wheel hub 12 is rotatably provided at the outer end of each steering knuckle 11. A steering knuckle arm 13 is protruded at the inner end of the steering knuckle 11, and a steering tie rod 14 is rotatably provided at the inner end of the steering knuckle arm 13. A regulating threaded cylinder 15 is provided at the inner end of the steering tie rod 14; a connecting transmission device 40 is provided at the outer end of each steering motor 20, and 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 installing 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 is protruded on the outer side of the connecting inner cylinder 51, and the inner side of the installing 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 installing outer cylinder 52, and the rotating cooling impeller 80 is rotatably installed in the connecting inner cylinder 51.

[0033] 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 at intervals along the circumferential direction on the inner wall of the sealing rotation groove 512 .

[0034] The input assembly 60 includes an input connecting rotating plate 61, an input sealing rotating 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 connecting 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 blades 614 are protruded 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 blades 614 are respectively arranged opposite to the plurality of connecting holes 613. A first mounting rotating hole 611 is recessed in the middle of the outer side of the input connecting rotating plate 61. The input sealing rotating cover 62 is installed on the inner side of the first mounting rotating hole 611. An input sealing rotating hole 621 is recessed in the middle of the side wall of the input sealing rotating cover 62. The outer wall of the input bearing 63 is installed on the outer side of the inner wall of the first mounting rotating hole 611. The input gear element 64 is installed in the input connecting rotating plate 61.

[0035] The input gear element 64 includes an input shaft 641, an input sun gear 642 and an elastic sealing sleeve 643. The middle part of the input shaft 641 is installed in the rotating input sealing hole 621, the outer end of the input shaft 641 is installed in the input bearing 63, and the inner end of the input shaft 641 is connected to the output shaft 21 of the steering motor 20. A cooling connecting ring 644 is convexly provided on the inner end of the outer wall of the input shaft 641. The inner side of the input sun gear 642 is installed on the outer side of the input shaft 641, and an output mounting hole 645 is recessed in the middle part of the outer side of the input sun gear 642. An output mounting bearing 646 is arranged in the output mounting hole 645, and 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.

[0036] The output assembly 70 includes an output connecting rotating plate 71, an output sealing rotating cover 72, an output bearing 73, two planetary gear elements 74 and an output gear element 75. The inner wall of the output connecting rotating plate 71 is rotatably mounted on the outer side of the inner wall of the mounting outer cylinder 52. A second mounting rotating hole 711 is recessed in the middle of the outer side of the output connecting rotating plate 71. Two second planetary rotating holes 712 are recessed in the inner side of the output connecting rotating plate 71, and the two second planetary rotating holes 712 are respectively arranged opposite to the two first planetary rotating holes 612. The output sealing rotating cover 72 is mounted on the outer side of the second mounting rotating hole 711. An output sealing hole 721 is recessed in the middle of the outer side of the output sealing rotating cover 72. The output bearing 73 is mounted on the inner side of the second mounting rotating hole 711. The two ends of the two planetary gear elements 74 are respectively rotatably mounted in the two second planetary rotating holes 712 and the two first planetary rotating holes 612. The output gear element 75 is rotatably mounted in the output connecting rotating plate 71.

[0037] Each planetary gear element 74 includes a gear shaft 741, two planetary gears 742, a bearing retaining ring 743 and a connecting pipe 744. The outer end of the gear shaft 741 is rotatably mounted in the second mounting hole 711, and the inner end of the gear shaft 741 is rotatably mounted in the first planetary hole 612. The two planetary gears 742 are respectively mounted at both ends of the outer wall of the gear shaft 741, and the planetary gears 742 located on the inner side of the mounting outer cylinder 52 are meshed and connected with the input sun gear 642. The two sides of the bearing retaining ring 743 are respectively mounted on In the middle part of the inner side of the two planetary gears 742, the outer wall of the bearing retaining ring 743 is recessed with a plurality of first connecting holes 745 at intervals along the circumferential direction, and the middle part of the outer wall of the gear shaft 741 is recessed with a plurality of second connecting holes 746 at intervals along the circumferential direction. An outlet hole 747 is recessed at the inner end of the gear shaft 741, and the outlet hole 747 is connected to the plurality of second connecting holes 746. The outer end of the connecting pipe 744 is installed on the inner end of the gear shaft 741, and the inner end of the outer wall of the connecting pipe 744 is recessed with a plurality of diffuser blades 748 at intervals along the circumferential direction.

[0038] 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 column 754. 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 mounting outer cylinder 52, and the output gear ring 752 is meshed and connected with the planetary gear 742 located on the outer side of the mounting outer cylinder 52. The inner side of the outer wall of the output connecting shaft 753 is installed in the output mounting 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 column 754 is installed on the outer side of the output connecting shaft 753. The outer side of the output threaded column 754 is recessed with a threaded groove 756. The output threaded column 754 is threadedly connected to the regulating threaded cylinder 15 through the threaded groove 756.

[0039] 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 rotates and abuts against the outer edge of the inner end of the output gear sleeve 751. A plurality of elastic rotating blades 647 are protruded from the outer wall of the elastic sealing sleeve 643 at intervals along the circumferential direction, and a plurality of hard arc-shaped pieces 648 are protruded from the middle part of the outer wall of the elastic sealing sleeve 643 at intervals along the circumferential direction. The plurality of hard arc-shaped pieces 648 are respectively arranged opposite to the plurality of elastic rotating blades 647, and the outer edges of the hard arc-shaped pieces 648 abut against the middle part of the inner wall of the elastic rotating blade 647.

[0040] An impeller mounting hole 81 is recessed in the middle of the side wall of the rotating cooling impeller 80, and the inner wall of the impeller mounting hole 81 is connected to the cooling connecting 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 is protruding on the inner side of the rotating cooling impeller 80, and an inclined dispersion 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 induction grooves 84 are recessed on the outer wall of the rotating cooling impeller 80 at intervals along the circumferential direction, and the plurality of spiral air induction grooves 84 are all connected to the inner side of the internal cavity of the connecting inner cylinder 51.

[0041] For example, in one embodiment: the outer wall of the mounting outer cylinder 52 is recessed with a coolant filling hole, so that before operation, 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. A plurality of uniform temperature outlet 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 conductive material.

[0042] For example, in one embodiment: a sensor and a microprocessor are provided 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 steering wheel rotation speed, angle and vehicle speed in real time, and accurately adjust the output power of the steering motor 20 according to these data, thereby realizing intelligent distribution of steering assistance.

[0043] For example, in one embodiment: when steering is required, the steering wheel is turned, and the proportional potentiometer 30 will identify the rotation angle and speed of the steering wheel, and send a signal to the two steering motors 20, so that the two steering motors 20 are started, so that the output shaft 21 of the steering motor 20 rotates, and then drives the input shaft 641 and the input sun gear 642 to rotate, and then the two planetary gears 742 located on the inner side of the mounting outer cylinder 52 rotate, and then the two planetary gear elements 74 rotate, and because the output ring gear 752 is installed on the outer side of the inner wall of the mounting outer cylinder 52, and the outer side of the output ring gear 752 is installed on the outer edge of the inner side of the output connecting rotating plate 71, the outer wall of the output ring gear 752 rotates and is installed on the outer side of the output connecting rotating plate 71. The outer side of the inner wall of the outer cylinder 52 is installed, and the output gear ring 752 is meshed with the planetary gear 742 located on the outer side of the outer cylinder 52, thereby transmitting power 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. 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 rotate accordingly. Since the output threaded column 754 is threadedly connected to the regulating threaded cylinder 15 through the threaded rotating groove 756, the regulating threaded cylinder 15 will move laterally, thereby pushing and pulling the steering knuckle arm 13, thereby achieving the effect of power steering.

[0044] For example, in one embodiment: when the input shaft 641 rotates, since the inner wall of the impeller mounting hole 81 is connected to the cooling connecting ring 644, the rotating cooling impeller 80 will rotate, and the multiple spiral air induction grooves 84 therein will follow the rotation, thereby sucking in the external air, and the external cooling air is sucked into the multiple spiral air induction grooves 84 through the multiple air inlet grooves 513, and flows out from the inside of the multiple spiral air induction grooves 84, directly performing a cooling impact on the outside of the steering motor 20, and after the impact, it flows out from the multiple temperature-averaging outlet grooves. Furthermore, 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 installed in the middle of the outer side of the input sun gear 642, and the outer wall of the elastic sealing sleeve 643 is provided with a plurality of elastic vanes 647 at intervals along the circumferential direction, when the elastic sealing sleeve 643 rotates, the plurality of elastic vanes 647 will follow the flow of the cooling lubricant in the inner cavity of the rotating acceleration installation outer cylinder 52, and part of the cooling lubricant is sent to the two planetary gear elements 74, and through the plurality of first connecting holes 745, the plurality of second connecting holes 745 and the plurality of After passing through the through hole 746, the outflow hole 747 and the internal cavity of the connecting tube 744, the cooling lubricant is sprayed from the inner end of the connecting tube 744 to the side wall of the outer side of the conical guide tube 82, and is guided to flow to the outer edge of the outer side of the internal cavity of the connecting inner tube 51 through the side wall of the outer side of the conical guide tube 82 and the inclined diffuser surface 83, and then flows back to the internal cavity of the mounting outer tube 52 through the multiple connecting holes 613. Since the multiple liquid guide blades 614 are respectively arranged opposite to the multiple connecting holes 613, the flow of the refluxed cooling lubricant will be accelerated when the input connection rotating plate 61 rotates, thereby ensuring the uniformity of the temperature of the entire device. In addition, when the inner end of the connecting tube 744 sprays to the side wall of the outer side of the conical guide tube 82, since it is made of heat conductive material, the cooling air sucked from the outside can be further cooled, thereby ensuring the cooling force of the steering motor 20.

[0045] For example, in one embodiment: when the vehicle is traveling on an uneven road, the ground impact is transmitted through the wheels to the steering system and then to the output connecting shaft 753 and the output threaded column 754. The output threaded column 754 is vibrated and evenly transmitted to the output connecting rotating plate 71, the output sealing rotating cover 72 and the output bearing 73. At this time, the circulating flow of the cooling lubricant can absorb the vibration, thereby achieving the purpose of shock reduction.

[0046] When the driver makes a sudden operation when turning, such as a sharp turn or a rapid adjustment of direction, the steering motor 20 is suddenly and quickly started, thereby generating instantaneous force and vibration, and the vibration is transmitted to the input shaft 641 and the elastic sealing sleeve 643 along the output shaft 21. Since 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 rotates and abuts against the outer edge of the inner end of the output gear sleeve 751, when vibrating, the elastic sealing sleeve 643 will be deformed, causing the elastic sealing sleeve 643 to expand and deform to absorb the vibration. At the same time, when the elastic sealing sleeve 643 expands and deforms, multiple elastic vanes 647 will follow the deformation, and multiple hard arc-shaped pieces 648 will expand outward. Since the outer edge of the hard arc-shaped piece 648 abuts against the middle part of the inner wall of the elastic vane 647, multiple elastic vanes 647 will follow the expansion, so that when it rotates, the rotational diffusion force of the cooling lubricant is increased, thereby accelerating the flow rate of the cooling lubricant.

[0047] Installation process: The two steering motors 20 are symmetrically arranged at the two ends of the middle part of the inner side of the steering bridge 10, the proportional potentiometer 30 is installed in the steering wheel and electrically connected to it, the proportional potentiometer 30 is electrically connected to the two steering motors 20, 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 installing outer cylinder 52 is installed in the outer cylinder mounting 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 rotating cover 62 is installed on the inner side of the first mounting rotating hole 611, the outer wall of the input bearing 63 is installed on the outer side of the inner wall of the first mounting rotating hole 611, the middle part of the input rotating shaft 641 is installed in the rotating input sealing rotating hole 621, and the input The outer end of the 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 on the middle part of the outer side of the input sun gear 642. The inner wall of the output connecting rotating plate 71 is rotated and installed on the outer side of the inner wall of the mounting outer cylinder 52. The output sealing rotating cover 72 is installed on the outer side of the second mounting rotating hole 711. The output bearing 73 is installed on the inner side of the second mounting rotating hole 711. The outer end of the gear rotating shaft 741 is rotatably installed in the second mounting 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 The planetary gears 742 are respectively mounted on both ends of the outer wall of the gear shaft 741, and the planetary gears 742 located on the inner side of the mounting outer cylinder 52 are meshed and connected with the input sun gear 642. The bearing retaining rings 743 are respectively mounted on the middle parts of the inner sides of the two planetary gears 742 on both sides. The outer end of the connecting pipe 744 is mounted on the inner end of the gear shaft 741. The outer end of the output gear sleeve 751 is mounted 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 mounted 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 mounted 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 gears located on the outer side of the mounting outer cylinder 52. The wheel 742 is meshed and connected, the inner side of the outer wall of the output connecting shaft 753 is installed in the output mounting 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 rotates and abuts 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 threaded groove 756, the inner wall of the impeller mounting 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 multiple spiral air induction grooves 84 are connected to the inner side of the internal cavity of the connecting inner cylinder 51.

[0048] The above-mentioned embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An electric power steering system, characterized in that: The invention comprises a steering bridge (10), two steering motors (20), a steering wheel and a proportional potentiometer (30), wherein the two steering motors (20) are symmetrically arranged at two ends of the middle part of the inner side of the steering bridge (10) to drive the steering bridge (10) to perform positioning and steering, and the proportional potentiometer (30) is installed in the steering wheel and electrically connected thereto, and 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.

2. The electric power steering system according to claim 1, characterized in that: Steering knuckles (11) are respectively provided inwardly protruding at both ends of one side of the steering bridge (10); a wheel hub (12) is rotatably provided at the outer end of each steering knuckle (11); a steering knuckle arm (13) is convexly provided at the inner end of the steering knuckle (11); a steering tie rod (14) is rotatably provided at the inner end of the steering knuckle arm (13); and a regulating threaded cylinder (15) is provided at the inner end of the steering tie rod (14); a connecting transmission device (40) is provided at the outer end of each steering motor (20); and each connecting transmission device (40) comprises a housing assembly (50), an input assembly (60), and an output assembly (70). and a rotating cooling impeller (80), the housing component (50) comprises a connecting inner cylinder (51) and a mounting outer cylinder (52), the inner side of the connecting inner cylinder (51) being mounted on the outer edge of the outer side of the steering motor (20), the outer side of the connecting inner cylinder (51) being provided with an outer cylinder mounting ring (511) protrudingly, the inner side of the mounting outer cylinder (52) being mounted in the outer cylinder mounting ring (511), the input component (60) being rotatably mounted in the connecting inner cylinder (51), the output component (70) being rotatably mounted in the mounting outer cylinder (52), and the rotating cooling impeller (80) being rotatably mounted in the connecting inner cylinder (51).

3. The electric power steering system according to claim 2, characterized in that: 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 at intervals along the circumferential direction on the inner wall of the sealing rotation groove (512).

4. The electric power steering system according to claim 3, characterized in that: The input assembly (60) comprises an input connecting rotating plate (61), an input sealing rotating cover (62), an input bearing (63) and an input gear element (64); the outer wall of the input connecting rotating plate (61) is rotatably mounted 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 connecting 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 guide holes (613) are protruded at intervals along the circumferential direction on the outer edge of the outer side of the input connecting rotating plate (61); A liquid blade (614), a plurality of liquid guide blades (614) are respectively arranged opposite to the plurality of communication holes (613), a first mounting rotation hole (611) is recessed in the middle of the outer side of the input connection rotation plate (61), an input sealing rotation cover (62) is mounted on the inner side of the first mounting rotation hole (611), an input sealing rotation hole (621) is recessed in the middle of the side wall of the input sealing rotation cover (62), an outer wall of the input bearing (63) is mounted on the outer side of the inner wall of the first mounting rotation hole (611), and an input gear element (64) is mounted in the input connection rotation plate (61).

5. The electric power steering system according to claim 4, characterized in that: The input gear element (64) comprises 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 mounted in the rotating input sealing rotating hole (621). The outer end of the input rotating shaft (641) is mounted in the input bearing (63). The inner end of the input rotating shaft (641) is connected to the output shaft (21) of the steering motor (20). A cooling connecting 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 mounted on the outer side of the input rotating shaft (641). The middle part of the outer side of the input sun gear (642) is concavely provided with an output mounting rotating hole (645). An output mounting rotating hole (645) is provided with an output mounting bearing (646). The inner side of the elastic sealing sleeve (643) is mounted on the middle part of the outer side of the input sun gear (642).

6. The electric power steering system according to claim 5, characterized in that: The output assembly (70) comprises an output connection rotating plate (71), an output sealing rotating 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 mounted on the outer side of the inner wall of the mounting outer cylinder (52); a second mounting rotating hole (711) is recessed in the middle of the outer side of the output connection rotating plate (71); two second planetary rotating holes (712) are recessed in the inner side of the output connection rotating plate (71); and the two second planetary rotating holes (712) are respectively connected to the two first A planetary rotating hole (612) is arranged oppositely, an output sealing rotating cover (72) is installed on the outside of the second mounting rotating hole (711), an output sealing hole (721) is recessed in the middle of the outer side of the output sealing rotating cover (72), an output bearing (73) is installed on the inner side of the second mounting rotating hole (711), two planetary gear elements (74) are rotatably installed in the two second planetary rotating holes (712) and the two first planetary rotating holes (612) at both ends, and an output gear element (75) is rotatably installed in the output connecting rotating plate (71).

7. The electric power steering system according to claim 6, characterized in that: Each planetary gear element (74) comprises a gear shaft (741), two planetary gears (742), a bearing retaining ring (743) and a connecting pipe (744). The outer end of the gear shaft (741) is rotatably mounted in the second mounting hole (711), and the inner end of the gear shaft (741) is rotatably mounted in the first planetary hole (612). The two planetary gears (742) are respectively mounted at both ends of the outer wall of the gear shaft (741), and the planetary gears (742) located on the inner side of the mounting outer cylinder (52) are meshedly connected with the input sun gear (642). The bearing retaining ring (743) is respectively mounted on both sides of the connecting pipe (744). Installed in the middle of the inner side of the two planetary gears (742), the outer wall of the bearing retaining ring (743) is recessed with a plurality of first communication holes (745) at intervals along the circumferential direction, the middle of the outer wall of the gear shaft (741) is recessed with a plurality of second communication holes (746) at intervals along the circumferential direction, the inner end of the gear shaft (741) is recessed with an outflow hole (747), the outflow hole (747) is connected to the plurality of second communication holes (746), the outer end of the communication pipe (744) is installed on the inner end of the gear shaft (741), and the inner end of the outer wall of the communication pipe (744) is recessed with a plurality of diffuser blades (748) at intervals along the circumferential direction.

8. The electric power steering system according to claim 7, characterized in that: The output gear element (75) comprises an output gear sleeve (751), an output gear ring (752), an output connecting shaft (753) and an output threaded column (754). 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 mounting outer cylinder (52). The output gear ring (75 2) meshingly connected with a planetary gear (742) located outside the mounting outer cylinder (52), the inner side of the outer wall of the output connecting shaft (753) is mounted in the output mounting bearing (646), the outer side of the outer wall of the output connecting shaft (753) is mounted in the output gear sleeve (751), the inner side of the output threaded column (754) is mounted on the outer side of the output connecting shaft (753), the outer side of the output threaded column (754) is concavely provided with a threaded groove (756), and the output threaded column (754) is threadedly connected with the regulating threaded cylinder (15) through the threaded groove (756).

9. The electric power steering system according to claim 8, 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) rotates and abuts against the outer edge of the inner end of the output gear sleeve (751). The outer wall of the elastic sealing sleeve (643) is provided with a plurality of elastic rotating blades (647) at intervals along the circumferential direction. The middle part of the outer wall of the elastic sealing sleeve (643) is provided with a plurality of hard arc-shaped pieces (648) at intervals along the circumferential direction. The plurality of hard arc-shaped pieces (648) are respectively arranged opposite to the plurality of elastic rotating blades (647), and the outer edges of the hard arc-shaped pieces (648) abut against the middle part of the inner wall of the elastic rotating blade (647).

10. The electric power steering system according to claim 9, characterized in that: An impeller mounting hole (81) is recessed in the middle of the side wall of the rotating cooling impeller (80), 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 tube (82) is convexly provided on the inner side of the rotating cooling impeller (80), and an inclined dispersion surface (83) is formed between the inner side of the conical guide tube (82) and the inner side of the rotating cooling impeller (80), and a plurality of spiral air induction 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 induction grooves (84) are all connected to the inner side of the internal cavity of the connecting inner tube (51).

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