Steer-by-wire system operation adjusting mechanism

Abstract

The utility model discloses an operation adjusting mechanism of a steer-by-wire system, which belongs to the technical field of automobile accessories and comprises a screw, a nut is arranged on the outer side of the middle of the screw, a positioning pin is arranged on one side of the screw, a worm gear is arranged on the outer side of one end of the screw, and a worm is mounted on the outer side of the worm gear in a meshed manner. An O-shaped ring is arranged at the upper end of the worm; compared with the prior art, due to the fact that the O-shaped ring is arranged, it can be guaranteed that the meshing gap between the worm gear and the worm cannot become larger along with operation time, the NVH (noise, vibration and sound and vibration roughness) problem of a system can be well solved, the overall structure is simple, and performance is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, and more specifically, to an operation adjustment mechanism for a steer-by-wire system. Background Art

[0002] With the development of vehicle intelligence and electrification, and the user's attention to comfort, the vehicle steering system is also changing. From the past hydraulic power steering system to the current electric power steering, it can no longer meet the needs of the steering system for autonomous driving under the blessing of intelligent driving and driverless technologies. Steer-by-wire technology will become an important technical development direction for future steering systems.

[0003] Under the condition of steer-by-wire technology, the main responsible party for the steering system will be the vehicle control system. For the steering control of the vehicle, the adjustment structure of the steering system, etc., all need to continuously change from the current focus on driving comfort to safety and other additional requirements during design and development. For the adjustment structure of the steering system, it is necessary to develop a system adjustment structure suitable for the requirements of the steer-by-wire system to adapt to future technologies such as intelligent cockpits and telescopic steering wheels. However, after long-term use, the existing steering adjustment mechanism is prone to wear at the connection position, resulting in problems such as vibration and noise at the worm and worm gear positions during movement. Summary of the Invention

[0004] The purpose of the utility model is to provide an operation adjustment mechanism for a steer-by-wire system to solve the problems put forward in the above background art.

[0005] The operation adjustment mechanism for the steer-by-wire system includes a screw rod. A nut is arranged on the outer side of the middle part of the screw rod. A positioning pin is arranged on one side of the screw rod. A worm gear is arranged on the outer side of one end of the screw rod. A worm is meshed and installed on the outer side of the worm gear. An O-ring is arranged at the upper end of the worm.

[0006] A first bushing is arranged on one side of the screw rod where the worm gear is located. A second bushing is arranged on the other side of the screw rod where the worm gear is located. A gasket is arranged on the outer side of the screw rod between the first bushing and the worm gear. An end face bearing is fixedly installed on the outer side of the middle part of the gasket. A screw rod housing is arranged on the outer side of the first bushing of the screw rod. A worm housing is arranged on the outer side of the second bushing of the screw rod. The screw rod housing and the worm housing are fixedly connected by a locking bolt in a threaded manner.

[0007] Further, a thread groove is opened on the outer side of the middle part of the screw rod. The screw rod is in threaded connection with the nut.

[0008] By adopting the above technical solution, when the screw rod rotates, since the whole screw rod is fixed and does not move, when the screw rod rotates in place, the nut will move towards the end away from the worm gear.

[0009] Furthermore, a motor is fixedly installed at the lower end of the worm.

[0010] By adopting the above technical solution, when the motor drives the worm to rotate, the rotation of the worm realizes the rotation of the worm wheel through the meshing of the worm wheel, and the rotation of the worm wheel will drive the rotation of the screw.

[0011] Furthermore, a nut limiting sleeve is clamped on the side of the screw away from the worm wheel.

[0012] By adopting the above technical solution, the nut limiting sleeve can limit the position of the nut and prevent the nut from slipping off the screw.

[0013] Furthermore, the worm wheel is connected to the screw by injection molding.

[0014] By adopting the above technical solution, this connection method effectively reduces the misalignment between components.

[0015] Furthermore, steel balls are arranged between the screw and the positioning pin.

[0016] By adopting the above technical solution, the end face of the positioning pin contacts the steel ball pre-pressed in the center of the end of the screw, and the meshing clearance between the worm wheel and the screw will be adjusted when adjusting the adjusting stud.

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] By providing a structure with an O-ring, it can ensure that the meshing clearance between the worm wheel and the worm does not increase with the running time, and can better solve the NVH (noise, vibration, and harshness) problems of the system. The overall structure is simple and the performance is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the screw structure of the present utility model;

[0020] Figure 2 is a cross-sectional view of the overall structure of the present utility model;

[0021] Figure 3 is a cross-sectional view of the position of the worm of the present utility model.

[0022] Explanation of the reference numerals in the drawings: 1, screw; 2, first bushing; 3, nut; 4, end face bearing; 5, worm wheel; 6, second bushing; 7, steel ball; 8, positioning pin; 9, adjusting stud; 10, worm; 11, O-ring; 12, motor; 13, nut limiting sleeve; 14, screw housing; 15, worm housing; 16, locking bolt; 17, gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] As Figure 1 - Figure 3 shown, the embodiments of the present utility model provide: including a screw rod 1, a nut 3 is arranged on the outer side of the middle part of the screw rod 1, a positioning pin 8 is arranged on one side of the screw rod 1, a worm gear 5 is arranged on the outer side of one end of the screw rod 1, a worm 10 is meshed and installed on the outer side of the worm gear 5, and an O-ring 11 is arranged at the upper end of the worm 10;

[0025] A first shaft bush 2 is arranged on one side of the screw rod 1 where the worm gear 5 is located, a second shaft bush 6 is arranged on the other side of the screw rod 1 where the worm gear 5 is located, a gasket 17 is arranged on the outer side of the screw rod 1 between the first shaft bush 2 and the worm gear 5, an end face bearing 4 is fixedly installed on the outer side of the middle part of the gasket 17, a screw rod housing 14 is arranged on the outer side of the screw rod 1 where the first shaft bush 2 is located, a worm housing 15 is arranged on the outer side of the screw rod 1 where the second shaft bush 6 is located, and the screw rod housing 14 and the worm housing 15 are fixedly connected by a locking bolt 16 in a threaded manner;

[0026] A thread groove is opened on the outer side of the middle part of the screw rod 1, and the screw rod 1 is in threaded connection with the nut 3. When the screw rod 1 rotates, since the whole screw rod 1 is fixed and does not move, when the screw rod 1 rotates in place, the nut 3 will move towards the end away from the worm gear 5;

[0027] A motor 12 is fixedly installed at the lower end of the worm 10. When the motor 12 drives the worm 10 to rotate, the rotation of the worm 10 realizes the rotation of the worm gear 5 through meshing, and the rotation of the worm gear 5 drives the rotation of the screw rod 1;

[0028] A nut limit sleeve 13 is clamped on the side of the screw rod 1 away from the worm gear 5, and the nut limit sleeve 13 can limit the position of the nut 3 to prevent the nut 3 from slipping off the screw rod 1;

[0029] The worm gear 5 is connected to the screw rod 1 by an injection molding method, and this connection method effectively reduces the misalignment between components;

[0030] Steel balls 7 are arranged between the screw rod 1 and the positioning pin 8, and the end face of the positioning pin 8 contacts the steel balls 7 that are pre-pressed in the center of the end of the screw rod 1. When adjusting the adjusting stud 9, the meshing clearance between the worm gear 5 and the screw rod 1 will be adjusted.

[0031] Working principle of the utility model: First, the first bushing 2 is press-fitted into the inner hole of the first bushing 2 with interference. Then, a gasket 17 and an end face bearing 4 are press-fitted at the end face of the worm wheel 5. After the screw rod 1 is installed inside the screw rod housing 14, a nut 3 is installed. To prevent the nut 3 from falling off, a nut limit sleeve 13 is provided at one end of the screw rod 1. A positioning pin 8 is press-fitted with interference inside the adjusting stud 9 first, and then it is assembled inside the worm housing 15. An O-ring 11 is installed at the upper end of the worm 10. Then, the worm 10 and the worm wheel 5 are meshed and connected. The locking bolt 16 and the worm housing 15 are fixed by bolts. When the motor 12 drives the worm 10 to rotate, the rotation of the worm 10 realizes the rotation of the turbine through the meshing of the worm wheel 5. The rotation of the worm wheel 5 will drive the rotation of the screw rod 1. Since the whole screw rod 1 is fixed and will not move, when the screw rod 1 rotates in place, the nut 3 will move towards the end away from the worm wheel 5. Due to the structure with the O-ring 11, it can ensure that the meshing clearance between the worm wheel 5 and the worm 10 will not increase with the running time, and can better solve the NVH (noise, vibration, and harshness) problems of the system. The overall structure is simple and the performance is more reliable. Moreover, a steel ball 7 is provided between the screw rod 1 and the positioning pin 8, and the end face of the positioning pin 8 contacts the steel ball 7 that is pre-press-fitted at the center of the end of the screw rod 1. When adjusting the adjusting stud 9, the meshing clearance between the worm wheel 5 and the screw rod 1 can be adjusted, realizing the minimum friction during adjustment and increasing the overall stability.

[0032] The above shows and describes the basic principles, main features, and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A steering-by-wire system operating and adjusting mechanism, comprising a screw (1), characterized in that: A nut (3) is arranged on the outer side of the middle part of the screw (1), a positioning pin (8) is arranged on one side of the screw (1), a worm wheel (5) is arranged on the outer side of one end of the screw (1), a worm (10) is meshingly mounted on the outer side of the worm wheel (5), and an O-ring (11) is arranged on the upper end of the worm (10); The screw (1) is provided with a first bushing (2) on one side of the worm wheel (5), and the screw (1) is provided with a second bushing (6) on the other side of the worm wheel (5); a gasket (17) is provided on the outer side of the screw (1) between the first bushing (2) and the worm wheel (5); an end face bearing (4) is fixedly mounted on the outer side of the middle part of the gasket (17); a screw housing (14) is provided on the outer side of the first bushing (2) of the screw (1), and a worm housing (15) is provided on the outer side of the second bushing (6) of the screw (1); the screw housing (14) and the worm housing (15) are threadedly fixedly connected by a locking bolt (16).

2. The operation adjustment mechanism of the steer-by-wire system according to claim 1, characterized in that: A thread groove is provided on the outer side of the middle portion of the screw rod (1), and the screw rod (1) is threadably connected to the nut (3).

3. The operation adjustment mechanism of the steer-by-wire system according to claim 1, characterized in that: A motor (12) is fixedly mounted on the lower end of the worm (10).

4. The operation adjustment mechanism of the steer-by-wire system according to claim 1, characterized in that: A nut limiting sleeve (13) is clamped on the side of the screw rod (1) away from the worm wheel (5).

5. The operation adjustment mechanism of the steer-by-wire system according to claim 1, characterized in that: The worm wheel (5) is connected to the screw rod (1) by injection molding.

6. The operation adjustment mechanism of the steer-by-wire system according to claim 1, characterized in that: A steel ball (7) is arranged between the screw rod (1) and the positioning pin (8).

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