Cycloidal-pin wheel redundant power-assisted steering gear

Abstract

The utility model relates to the technical field of automobile steering gears, and discloses a cycloidal-pin wheel redundant power-assisted steering gear which comprises a first shell, a second shell is fixedly connected to the outside of the first shell, a worm is rotatably connected to the inside of the second shell, a torsion bar is assembled on the outside of the worm, and a cycloidal-pin wheel is arranged on the torsion bar. An input shaft is assembled at the end, away from the worm, of the torsion bar, a second-stage transmission shaft is assembled in the first shell, a cycloidal-pin wheel set is assembled outside the second-stage transmission shaft, an output shaft is assembled outside the cycloidal-pin wheel set, and a worm gear in transmission connection with the worm is assembled outside the output shaft; a power-assisted motor is assembled on the outer portion of the first shell. The cycloidal-pin wheel redundant power-assisted steering gear and the cycloidal-pin wheel speed-reducing power-assisted steering gear are simple in structure, do not need hydraulic oil ways, and therefore are small in size, light in weight, small in occupied space, higher in transmission efficiency and capable of reducing power loss.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile steering gears, in particular to a cycloid pinwheel redundant power steering gear. Background Art

[0002] With the continuous improvement of off-road performance, electrification and intelligent off-road vehicles have become a new development trend. As the degree of chassis electrification continues to deepen, electric steering is becoming increasingly popular. As a steering assist system in vehicles, electric steering can accurately provide steering assistance through an electronic control unit to improve the driving experience and enhance vehicle controllability.

[0003] At present, the recirculating ball steering system and hydraulic steering system of the power-assisted ball screw of commercial vehicles are inefficient and require a large amount of energy consumption, which increases the operating cost of the vehicle. Since the power-assisted steering system of heavy trucks is composed of multiple components, it is difficult to maintain and requires regular replacement or repair, which increases the maintenance cost of the vehicle. The power-assisted steering system of heavy trucks has high requirements on the driver's operating skills and reaction speed and cannot achieve assisted driving. If the driver is not skilled, it may affect the operability and safety of the vehicle. Therefore, a cycloidal pinwheel redundant power steering device is urgently needed to solve the above problems. Utility Model Content

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the utility model provides a cycloid pinwheel redundant power steering device, which has the advantages of higher transmission efficiency and solves the problem of low efficiency of the recirculating ball steering system and hydraulic steering system of the power ball screw of commercial vehicles.

[0006] (2) Technical solution

[0007] The technical solution of the utility model for solving the above-mentioned technical problems is as follows: a cycloidal pinwheel redundant power steering device, comprising a first shell, the outside of the first shell is fixedly connected to a second shell, the inside of the second shell is rotatably connected to a worm, the outside of the worm is equipped with a torsion bar, the end of the torsion bar away from the worm is equipped with an input shaft, the inside of the first shell is equipped with a secondary transmission shaft, the outside of the secondary transmission shaft is equipped with a cycloidal pinwheel group, the outside of the cycloidal pinwheel group is equipped with an output shaft, the outside of the output shaft is equipped with a worm wheel connected to the worm gear, the outside of the first shell is equipped with a power-assist motor, and the inside of the first shell is rotatably connected to the motor shaft gear.

[0008] The beneficial effects of the utility model are:

[0009] The cycloid pinwheel redundant power steering gear and the cycloid pinwheel reduction power steering gear have a simple structure and do not require a hydraulic oil circuit. Therefore, they are small in size, light in weight, and take up little space. The cycloid pinwheel reduction power steering gear technology adopts advanced gear transmission technology, which has higher transmission efficiency, can reduce power loss, save energy, and also reduce the impact on the environment.

[0010] The cycloid pinwheel redundant power steering and cycloid pinwheel reduction power steering technology achieve steering assistance through an electronic control system, which can more accurately control steering force and steering angle, thereby meeting the needs of high-level autonomous driving.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, an ECU controller is installed on the top of the power-assisting motor.

[0013] Furthermore, a buffer pad is provided inside the motor shaft gear, a spline connection hole is provided outside the buffer pad, and the output shaft of the power-assisted motor is connected to the spline connection hole.

[0014] Furthermore, the interior of the first shell is rotatably connected to a transmission gear, the exterior of the transmission gear is equipped with a primary helical gear, the primary helical gear is meshed with the motor shaft gear, the exterior of the secondary transmission shaft is fixedly connected to a secondary helical gear, the secondary helical gear is meshed with the transmission gear.

[0015] Furthermore, a torque sensor is installed inside the second housing.

[0016] Furthermore, a lifting hook is fixedly installed on the outside of the first shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the utility model after shelling;

[0019] Figure 3 This is a top view of the structure of the utility model after the shell is removed;

[0020] Figure 4 This is a schematic diagram of the structure of the motor shaft gear in the utility model;

[0021] Figure 5 This is a schematic structural diagram of the first-stage helical gear in the present utility model;

[0022] Figure 6 This is a schematic structural diagram of the secondary helical gear in the present utility model;

[0023] Figure 7 This is a schematic structural diagram of the cycloid pinwheel assembly in the present utility model;

[0024] Figure 8 This is a schematic diagram of the structure of the worm in the utility model;

[0025] Figure 9 This is a schematic structural diagram of the first shell in the present utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the power assist motor in the present utility model;

[0027] Figure 11 This is a cross-sectional view of the structure of the utility model;

[0028] Figure 12 This is a schematic diagram of the transmission mechanism of the utility model.

[0029] In the figure: 1. Spline connecting hole; 2. Buffer pad; 3. Motor shaft gear; 4. First-stage helical gear; 5. Transmission gear; 6. Second-stage helical gear; 7. Second-stage transmission shaft; 8. Cycloidal pinwheel assembly; 9. Worm gear; 10. Output shaft; 11. Worm; 12. Torque sensor; 13. Torsion bar; 14. Input shaft; 15. First housing; 16. Second housing; 17. Power-assist motor; 18. ECU controller; 19. Lifting hook. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the embodiment, Figure 1-12 A cycloid pinwheel redundant power steering device is provided. The utility model includes a first housing 15, the outside of the first housing 15 is fixedly connected to a second housing 16, the inside of the second housing 16 is rotatably connected to a worm 11, the outside of the worm 11 is equipped with a torsion bar 13, the end of the torsion bar 13 away from the worm 11 is equipped with an input shaft 14, the inside of the first housing 15 is equipped with a secondary transmission shaft 7, the outside of the secondary transmission shaft 7 is equipped with a cycloid pinwheel group 8, the outside of the cycloid pinwheel group 8 is equipped with an output shaft 10, the outside of the output shaft 10 is equipped with a worm wheel 9 connected to the worm 11 for transmission, the outside of the first housing 15 is equipped with a power-assist motor 17, the inside of the first housing 15 is rotatably connected to the motor shaft gear 3, and the top of the power-assist motor 17 is equipped with an ECU controller 18.

[0032] A buffer pad 2 is provided inside the motor shaft gear 3, and a spline connection hole 1 is provided outside the buffer pad 2. The output shaft of the power assist motor 17 is connected to the spline connection hole 1. The interior of the first shell 15 is rotatably connected to the transmission gear 5. The outside of the transmission gear 5 is equipped with a first-stage bevel gear 4, which is meshed with the motor shaft gear 3. The outside of the second-stage transmission shaft 7 is fixedly connected with a second-stage bevel gear 6, which is meshed with the transmission gear 5. The interior of the second shell 16 is equipped with a torque sensor 12, and the outside of the first shell 15 is fixedly installed with a lifting hook 19.

[0033] According to the characteristics of gear transmission, the external meshing cylindrical helical gear reduction mechanism is arranged on the high-speed and low-torque transmission stage of the power steering transmission chain, the cycloid pinwheel reduction mechanism is arranged on the low-speed and high-torque transmission stage of the power steering transmission chain, and the worm and worm gear reduction mechanism is used for light load transmission of the steering control transmission chain.

[0034] The steering wheel and the cycloid pinion steering system are connected through the input shaft 14, and the input shaft 14 and the worm 11 are connected through the torsion bar 13. The worm 11 drives the worm wheel 9, and the elasticity causes the torsion bar 13 to twist and deform. The deformation can feedback the size of the wheel steering resistance. The torque sensor 12 on its core shaft detects the steering wheel rotation resistance torque and feeds back to the ECU controller 18 to control the power-assisted motor 17 to provide an appropriate output torque according to the received signal.

[0035] The motor shaft gear 3 drives the first-stage helical gear 4 to rotate, and the first-stage helical gear 4 rotates with the transmission gear 5. The transmission gear 5 drives the second-stage helical gear 6. The second-stage helical gear 6 drives the cycloid pinion set 8 to rotate through the second-stage transmission shaft 7. The cycloid pinion set 8 drives the output shaft 10, and the output shaft 10 drives the swing arm to rotate an angle, completing torque transmission and achieving a power-assisting effect.

[0036] Specific reference Figure 11 The worm gear 9 adopts a sector tooth structure. When the worm gear 9 swings left and right to the extreme position, its two side surfaces contact the angle limit block and are limited by the stroke; usually, the rotation angle range of the steering output shaft of the commercial vehicle steering gear is plus or minus 45 degrees, and the angle limit block is an integrated design utilizing the first housing 15.

[0037] There is a lifting hook 19 on the first shell 15 to facilitate workers' lifting. The oil plug is a magnetic oil plug. Iron filings from worn gears will be adsorbed on the magnet for easy cleaning. There is a buffer pad between the power-assist motor 17 and the motor shaft gear 3, which has the following functions: increasing the life of the motor. When the motor is running, a sudden stop will generate inertia and recoil inside the motor, causing impact and damage to the internal components of the motor. The motor buffer can reduce the possibility of sudden stop of the motor, thereby reducing damage to the internal components of the motor and extending the life of the motor; eliminating residual magnetic fields. When the motor is energized, a magnetic field will be generated inside the motor. When the motor stops running, the presence of the residual magnetic field will make it difficult to stop the motor or it will be unable to start in a short time. The motor buffer can eliminate the residual magnetic field by gradually reducing the speed of the motor, so that the motor can stop or start smoothly; reducing noise and vibration. When the motor stops, the motor buffer can gradually reduce the rotation speed of the motor, reducing the noise and vibration generated by the motor, which helps to keep the production environment quiet and stable without affecting product quality.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cycloid pinwheel redundant power steering device, comprising a first housing (15), characterized in that: The exterior of the first housing (15) is fixedly connected to the second housing (16), the interior of the second housing (16) is rotatably connected to the worm (11), the exterior of the worm (11) is equipped with a torsion bar (13), the end of the torsion bar (13) away from the worm (11) is equipped with an input shaft (14), the interior of the first housing (15) is equipped with a secondary transmission shaft (7), the exterior of the secondary transmission shaft (7) is equipped with a cycloidal pinwheel assembly (8), the exterior of the cycloidal pinwheel assembly (8) is equipped with an output shaft (10), the exterior of the output shaft (10) is equipped with a worm wheel (9) in transmission connection with the worm (11), the exterior of the first housing (15) is equipped with a power assist motor (17), and the interior of the first housing (15) is rotatably connected to the motor shaft gear (3).

2. The cycloid pinwheel redundant power steering according to claim 1, characterized in that: An ECU controller (18) is mounted on the top of the power-assisting motor (17).

3. The cycloid pinwheel redundant power steering according to claim 1, characterized in that: A buffer pad (2) is provided inside the motor shaft gear (3), a spline connection hole (1) is provided outside the buffer pad (2), and the output shaft of the power-assisted motor (17) is connected to the spline connection hole (1).

4. The cycloid pinwheel redundant power steering device according to claim 1, characterized in that: The interior of the first housing (15) is rotatably connected to a transmission gear (5), the exterior of the transmission gear (5) is equipped with a primary helical gear (4), the primary helical gear (4) is meshedly connected to the motor shaft gear (3), and the exterior of the secondary transmission shaft (7) is fixedly connected to a secondary helical gear (6), the secondary helical gear (6) is meshedly connected to the transmission gear (5).

5. The cycloid pinwheel redundant power steering according to claim 1, characterized in that: A torque sensor (12) is mounted inside the second housing (16).

6. The cycloid pinwheel redundant power steering according to claim 1, characterized in that: A lifting hook (19) is fixedly mounted on the outside of the first shell (15).

Images