Three-gear type electric steering gear structure

Abstract

The utility model discloses a three-gear type electric steering gear structure which comprises a rack, a torque increasing shell and a motor and is characterized in that a worm gear, a large bevel gear and a gear are arranged in the torque increasing shell, the worm gear is meshed with an inclined pinion, the worm gear is meshed with the large bevel gear through the inclined pinion, the upper end of the gear is fixedly connected with the center of the large bevel gear, and the lower end of the gear is fixedly connected with the center of the large bevel gear. A gear below the large bevel gear is meshed with the rack, an output shaft of the motor is connected with a worm, the worm is meshed with a worm gear, the worm and the worm gear serve as a first-stage transmission mechanism, the worm gear is coaxially and fixedly connected with a bevel pinion of a second-stage transmission mechanism, and the second-stage transmission mechanism adopts bevel gear transmission. The torque of the motor is amplified to the gear through the two-stage speed reducing mechanism, the torque is converted into rack thrust through meshing of the gear and the rack, and vehicle steering is achieved by pushing and pulling wheels; by introducing the speed reduction and torque increase mechanism and the optimized transmission system design, the output torque of the steering system can be effectively improved, and the working noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steering gears, in particular to a three-gear type electric steering gear structure. Background Art

[0002] With the rapid development of electrification (EV) and intelligent driving technology, the front axle load of vehicles is gradually increasing, which puts higher requirements on the output force of the steering system. When facing the demand for greater output force, the traditional dual-pinion power steering has problems such as insufficient torque transmission capacity and high working noise due to the worm gear transmission structure it adopts, which makes it difficult to meet the requirements of modern vehicles for steering system performance. Therefore, a new solution is urgently needed to improve the output force of the steering system and overcome the shortcomings of the existing technology.

[0003] In order to achieve the demand for greater output force, it is inevitable to choose a reducer with a larger speed ratio. In the traditional dual-gear power steering structure, the nylon worm gear transmission torque is limited and the noise is large, which cannot meet the requirements of high torque and low noise; Chinese patent application No. 202221477086.3 discloses a dual-gear electric power steering, which belongs to the technical field of automotive steering systems. The dual-gear electric power steering includes a housing, a rack, a power gear shaft, an input gear shaft and an input shaft; it is mainly reflected in its output torque limitation and high working noise. Since the steering gear adopts a traditional dual-gear transmission structure, although it can provide basic steering assistance, it is difficult to meet the demand for higher front axle loads in the face of the high output force requirements of electric vehicles and intelligent driving systems. In addition, the characteristics of the worm gear transmission make it produce higher noise when working. In view of the above-mentioned problems, a three-gear electric steering structure is proposed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a three-gear electric steering gear structure. By introducing a speed reduction and torque increase mechanism and an optimized transmission system design, the output torque of the steering system can be effectively improved, the working noise can be reduced, and the demand for high-performance steering systems of modern electric vehicles and intelligent driving systems can be met, and the problems in the background technology can be effectively solved.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a three-gear electric steering gear structure, including a rack, a torque-increasing housing and a motor, a worm gear, a large helical gear and a gear are arranged in the torque-increasing housing, the worm gear is meshed with a helical pinion, the worm gear is meshed with the large helical gear through the helical pinion, the upper end of the gear is fixedly connected to the center of the large helical gear, the gear under the large helical gear is meshed with the rack, the output shaft of the motor is connected with a worm, the worm gear is meshed with the worm gear, the worm gear and the worm gear are used as the first-stage transmission mechanism, the worm gear is coaxially fixedly connected with the helical pinion of the second-stage transmission mechanism, and the second-stage The transmission mechanism adopts helical gear transmission. The two-stage reduction mechanism amplifies the motor torque to the gear, and converts the torque into rack thrust through the meshing of the gear and the rack, pushing and pulling the wheel to realize vehicle steering. The rack is meshed with the hand-end gear, and the upper end of the hand-end gear is connected to the input end. The input end torque is rotated to drive the rack to move through the hand-end gear, thereby realizing vehicle steering. Adding a set of reduction and torque-increasing mechanisms on the basis of the original dual-gear power steering device can solve the problem of limited torque of nylon worm gear transmission. The use of helical gear reduction mechanism can maintain the horizontal arrangement of the original motor controller.

[0006] Furthermore, a worm gear positioning bearing and a clamping screw are provided in the torque increasing housing, the worm gear is arranged in the worm gear positioning bearing, a helical gear lower end needle bearing is arranged below the worm gear positioning bearing, and the lower end of the helical pinion is arranged in the helical gear lower end needle bearing.

[0007] Furthermore, a torque angle sensor is provided on the input end, and the torque angle sensor is electrically connected to the controller of the motor. The relative angle signal collected by the torque angle sensor at the input end is given to the controller of the motor. The controller controls the output torque of the motor according to the vehicle speed signal and the relative angle signal to achieve power assistance.

[0008] Furthermore, it also includes a steering housing, in which a rack is arranged, and steering rods are respectively arranged at both ends of the rack.

[0009] Furthermore, the torque increasing housing and the motor are fixedly connected to the steering housing respectively.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. Adding a set of speed reduction and torque increase mechanism on the basis of the dual-pinion power steering gear can solve the problem of limited torque of nylon worm gear transmission and significantly enhance the output torque of the steering gear. This design effectively solves the problem of insufficient torque transmission of traditional dual-pinion steering gear when facing a large front axle load, and is particularly suitable for the needs of electric vehicles and intelligent driving systems for large torque and high-efficiency steering systems.

[0012] 2. Helical gear transmission not only improves transmission efficiency, but also reduces vibration and noise, and improves driving comfort. This advantage is particularly evident under high-speed and high-load conditions, effectively avoiding noise pollution caused by excessive torque in traditional worm gear transmission.

[0013] 3. This design fully considers the layout of the motor controller and uses a helical gear reduction mechanism to improve system performance without changing the horizontal layout of the motor; this layout not only saves space and reduces design complexity, but also improves the stability and reliability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the input terminal structure of the utility model.

[0016] In the figure: 1 motor, 2 worm, 3 worm wheel, 4 worm wheel positioning bearing, 5 clamping screw, 6 helical pinion, 7 large helical gear, 8 needle roller bearing at the lower end of the helical gear, 9 gear, 10 rack, 11 input end, 12 torque angle sensor, 13 manual end gear, 14 torque increasing housing, 15 steering housing. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0018] See also Figure 1-2The utility model provides a technical solution: a three-gear electric steering gear structure, including a rack 10, a torque-increasing housing 14 and a motor 1, wherein the motor 1 is connected to a worm 2 through its output shaft, and the worm 2 is meshed with a worm wheel 3, serving as a first-stage speed reduction and torque-increasing mechanism; the cooperation between the worm and the worm wheel can realize the torque amplification of the motor output and perform preliminary speed reduction at the same time; the worm wheel 3 is coaxially fixed with a bevel pinion 6, and the bevel pinion 6 is meshed with a large bevel gear 7 to form a second-stage transmission, further reducing speed and enhancing torque output; through this configuration, the large bevel gear 7 can effectively amplify the torque transmitted by the motor and reduce the noise in the worm gear transmission. Problem; the large bevel gear 7 is connected to the rack 10 through the gear 9, and the rack 10 provides driving force during the steering process, converts the torque transmitted by the motor into thrust, and drives the front wheels of the vehicle to steer; the rack 10 is also connected to the manual end gear 13, and the manual end gear 13 receives the driver's manual torque input through the input end 11; through the rotation of the input end 11, the driver can manually intervene when necessary to ensure safe operation when the automatic driving system has an abnormality; the steering housing 15 is used to fix the rack 10 to provide support and protection; the two ends of the rack 10 are respectively connected to the steering rod to achieve linkage with the vehicle suspension system.

[0019] Through the dual reduction and torque-increasing mechanism of worm gear and helical gear, the steering gear of this embodiment can significantly increase the torque output by the motor to meet the steering requirements of smart electric vehicles under high load and high torque requirements, and is particularly suitable for the needs of large front axle load and high-precision steering.

[0020] This design uses a helical gear structure to maintain the horizontal layout of the motor controller, avoiding the need to redesign the motor position, saving space and improving system integration; the horizontal layout of the motor also improves the stability and reliability of the system, meeting the requirements of intelligent driving for efficient and stable steering.

[0021] When in use: the motor 1 is started according to the control signal, and drives the worm 2 through the output shaft, and the worm 2 meshes with the worm wheel 3 to achieve preliminary deceleration and torque amplification; the worm wheel 3 is coaxially connected with the bevel pinion 6, and the bevel pinion 6 further meshes with the large bevel gear 7 to form a second-stage deceleration and torque increase mechanism, thereby enhancing the torque output; the large bevel gear 7 transmits the enhanced torque to the rack 10 through the gear 9, and the rack 10 generates thrust to drive the front wheels to complete the steering; when manual intervention is required, the driver rotates the hand-end gear 13 through the input end 11, thereby driving the rack 10 to steer, ensuring the smoothness of manual control.

[0022] The three-gear electric steering gear of this embodiment is particularly suitable for smart electric vehicles, self-driving vehicles, and high-precision steering systems that require large output torque and low noise; it can not only meet the steering needs of traditional electric vehicles, but also adapt to the higher requirements of future smart driving for steering systems, providing a more efficient, stable and safe steering solution.

[0023] The basic principles, main features and advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also be subject to various changes and improvements, which are all within the scope of the present invention to be protected.

Claims

1. A three-gear electric steering gear structure, comprising a rack (10), a torque-enhancing housing (14) and a motor (1), characterized in that: A worm gear (3), a large helical gear (7) and a gear (9) are arranged in the torque increasing housing (14); the worm gear (3) is meshed with a helical pinion gear (6); the worm gear (3) is meshed with the large helical gear (7) via the helical pinion gear (6); the upper end of the gear (9) is fixedly connected to the center of the large helical gear (7); the large helical gear (7) is meshed with a rack (10) via the gear (9); the output shaft of the motor (1) is connected with a worm (2); the worm (2) is meshed with the worm gear (3); the rack (10) is meshed with a hand force end gear (13); and the upper end of the hand force end gear (13) is connected to the input end (11).

2. The three-gear electric steering gear structure according to claim 1, characterized in that: A worm gear locating bearing (4) and a pressing screw plug (5) are arranged in the torque increasing housing (14); the worm gear (3) is arranged in the worm gear locating bearing (4); a bevel gear lower end needle roller bearing (8) is arranged below the worm gear locating bearing (4); and the lower end of the bevel pinion (6) is arranged in the bevel gear lower end needle roller bearing (8).

3. The three-gear electric steering gear structure according to claim 1, characterized in that: A torque angle sensor (12) is provided on the input end (11), and the torque angle sensor (12) is electrically connected to a controller of the motor (1).

4. The three-gear electric steering gear structure according to claim 1, characterized in that: It also comprises a steering housing (15), in which the rack (10) is arranged, and at both ends of the rack (10) are respectively provided steering tie rods.

5. The three-gear electric steering gear structure according to claim 4, characterized in that: The torque increasing housing (14) and the motor (1) are respectively fixedly connected to the steering housing (15).

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