Commercial large-torque automobile power-assisted steering gear

Abstract

The utility model relates to a commercial large-torque automobile power-assisted steering gear which comprises a steering gear body and a speed reducer, the steering gear body comprises a steering gear shell, a steering rocker arm shaft, a lead screw and a circulating ball assembly, the lead screw is installed in the steering gear shell, the circulating ball assembly acts on the lead screw, and the steering rocker arm shaft is connected with the circulating ball assembly. According to the commercial vehicle power-assisted steering gear with the large torque output, the input large torque is reduced through the planetary gear with the large transmission ratio, steering assistance is directly provided by the motor, a power steering oil pump, a hose, hydraulic oil, a conveying belt and a belt pulley installed on an engine which are necessary for a hydraulic power steering system are omitted, energy is saved, and the commercial vehicle power-assisted steering gear with the large torque output has the advantages of being energy-saving and environment-friendly. And the environment is protected. The steering gear has great design flexibility, is compact in structure and small in size, is more suitable for commercial large-torque vehicles, fills the blank of an electric power steering gear, is green and efficient, and can also improve the operation comfort of a driver in the driving process.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering systems, specifically to a commercial high-torque automotive power steering system. Background Technology

[0002] In the current automotive manufacturing industry, commercial vehicles are widely used in various fields such as logistics and transportation due to their high load capacity and high efficiency. However, with increasingly stringent environmental regulations and the growing market demand for high-performance vehicles, the mainstream structure of commercial vehicles in my country is still the pure hydraulic recirculating ball structure, which lacks a steering system that is better suited to the high power consumption and large steering assist requirements of commercial vehicles. Utility Model Content

[0003] To address the technical problems existing in the prior art, this utility model provides a commercial high-torque automotive power steering system.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A commercial high-torque automotive power steering system includes a steering system body and a reducer. The steering system body includes a steering system housing, a steering rocker arm shaft, a lead screw, and a recirculating ball assembly. The lead screw is installed inside the steering system housing, the recirculating ball assembly acts on the lead screw, and the steering rocker arm shaft is connected to the recirculating ball assembly.

[0006] As a preferred technical solution, the steering gear housing includes an outer shell, a front cover for the lead screw, and a rear cover for the lead screw. The outer shell is fixedly connected to the front cover for the lead screw by bolts, and the outer shell is connected to the rear cover for the lead screw by screws.

[0007] As a preferred technical solution, the two ends of the lead screw are respectively connected to the front cover and the rear cover of the lead screw via oil seals.

[0008] As a preferred technical solution, the output end of the steering rocker arm shaft is positioned by the housing and connected to a Haval via bolts, and the sweeping teeth on the steering rocker arm shaft mesh with the rack on the recirculating ball assembly.

[0009] As a preferred technical solution, the reducer includes a reducer housing, a rear cover, a locking ring, a drive unit, a planetary carrier, two planetary gears on both sides, a first sun gear, and a second sun gear. The reducer housing and the rear cover are connected by threads and the connection is fixed by a locking ring. The steering gear housing and the reducer housing are connected by screws. The drive unit is connected to the two planetary gears on both sides through the planetary carrier. The planetary gears mesh with the first sun gear. The first sun gear and the steering rocker arm shaft are an integral part. The second sun gear and the rear cover are connected by splines.

[0010] As a preferred technical solution, the drive unit includes a drive motor and a coupling, the planetary carrier includes a double-headed worm and a worm gear, the shaft of the drive motor is connected to the double-headed worm via the coupling to input torque, the worm gear meshes with the double-headed worm, and the double-headed worm transmits torque to the planetary gears on both sides through the worm gear.

[0011] As a preferred technical solution, the turbine is connected and positioned to the rear cover via a stepped shaft, and the rear cover is connected to the reducer housing via a threaded connection.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This utility model discloses a commercial high-torque power steering system for automobiles, which boasts advantages such as a large transmission ratio, high output torque, low energy consumption, and high reliability. The high-performance electric power steering system will significantly improve the handling and stability of commercial vehicles, reduce the risk of traffic accidents caused by steering system failures, and provide safer driving protection for drivers and passengers. The large transmission ratio and high output torque design will enable commercial vehicles to maintain excellent steering performance under heavy load and high torque conditions, improving vehicle transportation efficiency and economic benefits. The low energy consumption design will help reduce fuel consumption and emissions of commercial vehicles, meeting environmental regulations and promoting the development of green transportation.

[0014] This utility model discloses a commercial high-torque automotive power steering system with advantages of flexible layout and high transmission efficiency. The motor output is reduced and amplified by a reduction mechanism before driving a worm gear mechanism to generate significant steering assistance. Since the electric power steering system only requires electricity and not hydraulic pressure, it eliminates many components compared to mechanical hydraulic power steering systems. It lacks the oil pump, oil pipes, pressure and flow control valves, and oil reservoirs required by hydraulic systems, resulting in fewer parts, easier layout, and lighter weight. Furthermore, it eliminates parasitic losses and fluid leakage losses. Therefore, the electric power steering system can save approximately 80% of energy under various driving conditions, improving vehicle performance and fuel economy, and meeting the various needs of large vehicle steering systems. Attached Figure Description

[0015] Figure 1 This is a partial sectional view of the commercial high-torque automotive power steering system of this utility model;

[0016] Figure 2 This is a partial sectional view of the reducer in the commercial high-torque automotive power steering system of this utility model;

[0017] Figure 3 This is a front view of the internal structure of the commercial high-torque automotive power steering system of this utility model;

[0018] Figure 4 This is a top view of the commercial high-torque automotive power steering system of this utility model;

[0019] Figure 5 This is a simplified diagram of the reducer motion of a commercial high-torque automotive power steering system according to this utility model.

[0020] In the diagram: 1. Drive motor; 2. Lead screw; 3. Recirculating ball assembly; 4. Housing; 5. Steering rocker arm shaft; 6. Double-ended worm gear; 7. Turbine; 8. First planetary gear; 9. First sun gear; 10. Second sun gear; 11. Second planetary gear; 12. Haval; 13. Lead screw front cover; 14. Lead screw rear cover; 15. Reducer housing; 16. Stepped shaft; 17. Rear cover. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to specific embodiments:

[0022] like Figure 1 As shown, a commercial high-torque automotive power steering system includes a steering system body and a reducer. The steering system body includes a steering system housing, a steering rocker arm shaft 5, a lead screw 2, and a recirculating ball assembly 3. The lead screw 2 is installed inside the steering system housing, the recirculating ball assembly 3 acts on the lead screw 2, and the steering rocker arm shaft 5 is connected to the recirculating ball assembly 3.

[0023] This utility model presents a superior solution for a commercial high-torque automotive power steering system. It utilizes planetary gears with a large transmission ratio to reduce the input torque, and the electric motor directly provides steering assistance. This eliminates the need for a power steering pump, hoses, hydraulic oil, transmission belt, and pulley mounted on the engine required by a hydraulic power steering system, saving energy and protecting the environment. This design allows for significant flexibility in steering system construction, resulting in a compact and small-sized system, making it more suitable for commercial high-torque vehicles. It fills a gap in the electric power steering market, offering both green efficiency and improved driver comfort during operation.

[0024] The steering gear housing includes an outer shell 4, a lead screw front cover 13, and a lead screw rear cover 14. The outer shell 4 is fixedly connected to the lead screw front cover 13 by bolts and gaskets, and the outer shell 4 is fixedly connected to the lead screw rear cover 14 by gaskets and screws.

[0025] The lead screw 2 is installed inside the housing 4, such as Figure 3 As shown, the two ends of the lead screw 2 are respectively connected to the front cover 13 and the rear cover 14 of the lead screw through oil seals.

[0026] The output end of the steering rocker arm shaft 5 is positioned by the housing 4 and sealed with a sealing gasket. The steering rocker arm shaft 5 passes through the housing 4 and is connected to a Haval 12 by bolts. The sweeping teeth on the steering rocker arm shaft 5 mesh with the rack on the recirculating ball assembly 3.

[0027] The reducer includes a reducer housing 15, a rear cover 17, a locking ring, a drive unit, a planetary carrier, planetary gears 8 and 11 on both sides, a first sun gear 9, and a second sun gear 10, as shown below. Figure 4 As shown, the reducer housing 15 is threaded to the rear cover 17 and the connection is secured by a locking ring. The steering gear housing is connected to the reducer housing 15 by screws, as shown. Figure 2 As shown, the drive unit is connected to the planetary gears 8 and 11 on both sides via the planetary carrier. The planetary gears 8 and 11 mesh with the first sun gear 9. The first sun gear 9 and the steering rocker arm shaft 5 are an integral part. The second sun gear 10 and the rear cover 17 are connected by a spline.

[0028] The drive unit includes a drive motor 1 and a coupling. The planetary carrier includes a double-ended worm gear 6 and a worm wheel 7. The shaft of the drive motor 1 is connected to the double-ended worm gear 6 via the coupling to transmit input torque. The worm wheel 7 meshes with the double-ended worm gear 6, and the double-ended worm gear 6 transmits torque to the planetary gears 8 and 11 on both sides through the worm wheel 7. The planetary gears 8 and 11 then transmit the torque to the first sun gear 9, outputting torque. The worm wheel 7 is connected and positioned to the rear cover 17 via a stepped shaft 16. The rear cover 17 is threadedly connected to the reducer housing 15.

[0029] like Figure 5 As shown, the reducer is a planetary reducer using a worm gear as the planet carrier, with the turbine 7 serving as the input. The reducer employs a relatively large transmission ratio. The double-ended worm gear 6 uses the turbine 7 as the planet carrier, with the planet carrier as the input, transmitting torque to the planetary gears 8 and 11 on both sides. The double-ended worm gear 6 drives the turbine 7 to rotate, with the second sun gear 10 serving as the output. The double-ended worm gear 6 is connected to the drive motor 1, utilizing electrical energy to sense the driver's steering intention and generate corresponding electrical signals to control the steering valve and the operating state of the drive motor 1, thereby achieving vehicle steering control.

[0030] When the driver steers, a torque sensor mounted on the steering wheel shaft detects the steering direction and torque magnitude, transmitting a voltage signal to the electronic control unit (ECU). Based on the torque voltage signal, steering direction, and vehicle speed detected by the torque sensor, the ECU sends a command to the motor controller, causing drive motor 1 to output a corresponding magnitude and direction of steering assist torque, thus generating auxiliary power. When the car is not steering, the ECU does not send a command to the motor controller, and drive motor 1 does not operate. In other words, the ECU determines the rotation direction and optimal assist torque of drive motor 1 based on the signals output from various sensors, sending control signals to drive motor 1 and the clutch. Through power drive, it controls the rotation of the DC motor. The output of drive motor 1 is reduced in speed and torque after passing through a reduction mechanism. A two-stage planetary reducer with a large transmission ratio is used, employing a worm gear transmission to reduce the large input torque. Simultaneously, the use of a recirculating ball structure increases the transmission efficiency of the transmission system.

[0031] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-creative modifications to this embodiment as needed after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A commercial high-torque automotive power steering system, characterized in that, The steering gear includes a steering gear body and a reducer. The steering gear body includes a steering gear housing, a steering rocker arm shaft, a lead screw, and a recirculating ball assembly. The lead screw is installed inside the steering gear housing, the recirculating ball assembly acts on the lead screw, and the steering rocker arm shaft is connected to the recirculating ball assembly.

2. The commercial high-torque automotive power steering system according to claim 1, characterized in that, The steering gear housing includes an outer shell, a front cover for the lead screw, and a rear cover for the lead screw. The outer shell is fixedly connected to the front cover for the lead screw by bolts, and the outer shell is connected to the rear cover for the lead screw by screws.

3. The commercial high-torque automotive power steering system according to claim 2, characterized in that, The two ends of the lead screw are respectively connected to the front cover and the rear cover of the lead screw box through oil seals.

4. The commercial high-torque automotive power steering system according to claim 2, characterized in that, The output end of the steering rocker arm shaft is positioned by a housing and connected to a Haval via bolts, and the sweeping teeth on the steering rocker arm shaft mesh with the rack on the recirculating ball assembly.

5. The commercial high-torque automotive power steering system according to claim 1, characterized in that, The reducer includes a reducer housing, a rear cover, a locking ring, a drive unit, a planetary carrier, two planetary gears, a first sun gear, and a second sun gear. The reducer housing and the rear cover are connected by threads and the connection is fixed by a locking ring. The steering gear housing and the reducer housing are connected by screws. The drive unit is connected to the two planetary gears via the planetary carrier. The planetary gears mesh with the first sun gear. The first sun gear and the steering rocker arm shaft are integral parts. The second sun gear and the rear cover are connected by a spline.

6. The commercial high-torque automotive power steering system according to claim 5, characterized in that, The drive unit includes a drive motor and a coupling. The planetary carrier includes a double-ended worm gear and a turbine. The shaft of the drive motor is connected to the double-ended worm gear via the coupling to input torque. The turbine meshes with the double-ended worm gear, and the double-ended worm gear transmits torque to the planetary gears on both sides via the turbine.

7. The commercial high-torque automotive power steering system according to claim 6, characterized in that, The turbine is connected and positioned to the rear cover via a stepped shaft, and the rear cover is connected to the reducer housing via a threaded connection.

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