Electric steering device and automobile

Abstract

The utility model discloses an electric steering device and an automobile, and belongs to the technical field of steering devices.The electric steering device comprises a shell; the rotating shaft can rotate relative to the shell, and the rotating shaft is provided with a screw section; the transmission part is arranged on the screw rod section in a sleeving mode and engaged with the screw rod section, and a plurality of first transmission teeth are arranged on the peripheral side of the transmission part; the output part can rotate relative to the shell, the output part is provided with a plurality of second transmission teeth, and the second transmission teeth are meshed with the first transmission teeth; the multiple supporting parts are distributed between the peripheral side of the transmission part and the shell around the axis of the rotating shaft, and the multiple supporting parts make contact with the shell and the transmission part correspondingly; in the direction surrounding the axis of the rotating shaft, the interval between the at least one supporting part and the output part is larger than 90 degrees, and the interval between the at least one supporting part and the output part is smaller than 90 degrees. The multiple supporting parts transmit the radial force and the rotating torque generated by movement of the transmission part to the shell, and the bearing capacity of the whole electric steering device is improved.

Description

Technical Field

[0001] This application belongs to the field of steering device technology, specifically relating to an electric steering device and an automobile. Background Technology

[0002] Currently, compared to hydraulic steering systems, electric steering systems offer advantages such as higher efficiency and lower energy consumption, and do not require an external hydraulic system. However, the load-bearing capacity of electric steering systems is generally lower than that of hydraulic steering systems. To improve the load-bearing capacity, it is usually necessary to increase the size and strength of the transmission components inside the electric steering system, which in turn leads to an increase in the overall size and weight of the electric steering system. Utility Model Content

[0003] The purpose of this utility model is to provide an electric steering device to solve the above-mentioned technical problems; another purpose of this application is to provide a car that uses the above-mentioned electric steering device.

[0004] Technical solution: An electric steering device according to an embodiment of this application includes:

[0005] case;

[0006] A rotating shaft, at least partially disposed within the housing and rotatable relative to the housing, the rotating shaft having a screw section in its own axial direction;

[0007] A transmission part is sleeved on and meshes with the screw section. In response to the rotation of the rotating shaft, the transmission part is configured to be able to move along the axial direction of the rotating shaft. The outer peripheral side of the transmission part is provided with a plurality of first transmission teeth along the axial direction of the rotating shaft.

[0008] The output section is rotatable relative to the housing, and the output section is provided with a plurality of second transmission teeth around its own rotation axis, the second transmission teeth meshing with the first transmission teeth;

[0009] Multiple support portions are distributed between the outer periphery of the transmission portion and the housing, with the axis surrounding the rotation shaft, and the multiple support portions respectively contacting the housing and the transmission portion;

[0010] Wherein, in the direction surrounding the axis of rotation, the distance between at least one of the support portions and the output portion is greater than 90°, and the distance between at least one of the support portions and the output portion is less than 90°.

[0011] In some embodiments, the plurality of support portions include a first support portion and a second support portion, and the output portion is located between the first support portion and the second support portion in a direction surrounding the axis of rotation, and the interval between the first support portion and the output portion and the interval between the second support portion and the output portion are both less than 90°.

[0012] In some embodiments, the plurality of support portions include a third support portion, which is disposed on the side of the transmission portion opposite to the output portion.

[0013] In some embodiments, the housing has a first arcuate surface facing the support portion, and the support portion has a second arcuate surface that conforms to the first arcuate surface.

[0014] In some embodiments, the radius of the second arc surface is smaller than the radius of the first arc surface.

[0015] In some embodiments, in response to axial movement of the transmission part along the rotation axis, a sliding support or a rolling support is formed between the support part and the transmission part.

[0016] In some embodiments, the support extends axially along the rotation axis, and the extension dimension of the support along the rotation axis is not less than the movement distance of the transmission part along the rotation axis.

[0017] In some embodiments, the transmission portion has a first contact surface facing the support portion, and the support portion has a second contact surface that contacts the first contact surface, the first contact surface being parallel to the second contact surface.

[0018] In some embodiments, the housing is provided with a limiting portion that abuts against the support portion in the axial direction of the rotating shaft.

[0019] Accordingly, the automobile described in this application embodiment includes the above-mentioned electric power steering device.

[0020] Beneficial Effects: The electric steering device of this application embodiment includes a housing, a rotating shaft, a transmission part, an output part, and a plurality of support parts. At least a portion of the rotating shaft is disposed within the housing and is rotatable relative to the housing. The rotating shaft has a screw section in its own axial direction. The transmission part is sleeved on the screw section and engages with the screw section. In response to the rotation of the rotating shaft, the transmission part is configured to be movable along the axial direction of the rotating shaft. The outer peripheral side of the transmission part is provided with a plurality of first transmission teeth along the axial direction of the rotating shaft. The output part is rotatable relative to the housing and is provided with a plurality of second transmission teeth about its own rotation axis. The second transmission teeth engage with the first transmission teeth. A plurality of support parts are distributed between the outer peripheral side of the transmission part and the housing around the axis of the rotating shaft. The plurality of support parts respectively contact the housing and the transmission part. In the direction around the axis of the rotating shaft, the distance between at least one support part and the output part is greater than 90°, and the distance between at least one support part and the output part is less than 90°. Multiple independent support parts form multi-point support on the outer periphery of the transmission part around the axis of the rotation shaft. This facilitates the transmission of radial force and torque generated during the axial movement of the transmission part along the rotation shaft to the housing, reducing the radial force and torque transmitted to the rotation shaft. As a result, the load-bearing capacity of the overall electric steering device can be improved without increasing the size of the rotation shaft. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional structural schematic diagram of the electric steering device according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the electric steering device according to an embodiment of this application;

[0024] Figure 3 This is an exploded structural diagram of the electric steering device according to an embodiment of this application;

[0025] Reference numerals: 1. Housing; 10. Receiving cavity; 11. First arc surface; 12. Limiting part; 2. Rotating shaft; 20. Screw section; 200. First helical groove; 21. Axis; 3. Transmission part; 30. Second helical groove; 31. First transmission tooth; 32. First contact surface; 4. Output part; 40. Second transmission tooth; 5. Support part; 50. First support part; 51. Second support part; 52. Third support part; 53. Second arc surface; 54. Second contact surface; 6. Ball bearing. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0028] Currently, the most common steering system for heavy-duty commercial vehicles is the hydraulic power steering (HPS), while electric power steering (EPS) is less frequently used. The main function of an electric steering system is to drive the steering mechanism via an electric motor to achieve vehicle steering. Compared to traditional hydraulic steering systems, electric steering systems offer higher efficiency and lower energy consumption, while also reducing maintenance and upkeep costs. Furthermore, electric steering systems offer advantages such as fast response and high steering precision, significantly improving vehicle handling and driving safety, and meeting the growing demands of intelligent driving technology and new energy vehicles.

[0029] However, compared to hydraulic steering systems, electric steering systems have relatively lower load-bearing capacity. To improve the load-bearing capacity of electric steering systems, it is usually necessary to increase the size and strength of the transmission components inside the electric steering system, which in turn leads to an increase in the overall size and weight of the electric steering system.

[0030] In view of this, refer to Figure 1 and Figure 3 This application provides an electric steering device that aims to overcome at least one of the above-mentioned technical problems.

[0031] Reference Figures 1 to 3An electric steering device includes a housing 1, a rotating shaft 2, a transmission part 3, an output part 4, and multiple support parts 5.

[0032] At least a portion of the rotating shaft 2 is disposed within the housing 1 and is rotatable relative to the housing 1. The rotating shaft 2 has a screw section 20 along its own axial direction. A transmission part 3 is sleeved on and engages with the screw section 20. In response to the rotation of the rotating shaft 2, the transmission part 3 is configured to move along the axial direction of the rotating shaft 2. The outer periphery of the transmission part 3 is provided with a plurality of first transmission teeth 31 along the axial direction of the rotating shaft 2. The output part 4 is rotatable relative to the housing 1. The output part 4 is provided with a plurality of second transmission teeth 40 around its own rotation axis 21. The second transmission teeth 40 engage with the first transmission teeth 31. A plurality of support parts 5 are distributed around the axis 21 of the rotating shaft 2 between the outer periphery of the transmission part 3 and the housing 1. The plurality of support parts 5 respectively contact the housing 1 and the transmission part 3. In the direction surrounding the axis 21 of the rotating shaft 2, the distance between at least one support part 5 and the output part 4 is greater than 90°, and the distance between at least one support part 5 and the output part 4 is less than 90°.

[0033] In this embodiment, the housing 1 has a receiving cavity 10, and the rotating shaft 2 and the output part 4 are both rotatably disposed within the receiving cavity 10. Multiple first transmission teeth 31 form a rack structure on the transmission part 3 to allow for stable meshing of multiple second transmission teeth 40 on the output part 4. The transmission part 3 converts the rotational motion of the rotating shaft 2 into linear motion to achieve deceleration and torque increase. The output part 4 converts the linear motion of the transmission part 3 into rotational motion to facilitate the output of steering driving force.

[0034] Multiple support parts 5 form multi-point support on the outer periphery of the transmission part 3 around the axis 21 of the rotating shaft 2. The interval between at least one support part 5 and the output part 4 is greater than 90°, and the interval between at least one support part 5 and the output part 4 is less than 90°, thereby hindering the rotation trend of the transmission part 3. This facilitates the transmission of radial force and torque generated during the axial movement of the transmission part 3 along the rotating shaft 2 to the housing 1, reducing the radial force and torque transmitted to the rotating shaft 2. Thus, the load-bearing capacity of the overall electric steering device can be improved without increasing the size of the rotating shaft 2.

[0035] Furthermore, the multiple support parts 5 are independent of each other, making them easier to manufacture than the support structure that surrounds the transmission part 3. They also offer higher precision in fit and a lower coefficient of friction, which helps reduce the overall weight of the electric steering device and extend its service life. Compared to the transmission part 3 directly contacting the housing 1, this avoids making the housing 1 too heavy and increasing its manufacturing difficulty. The replacement cost of the housing 1 after wear is also higher. In contrast, the support parts 5 have lower replacement costs and higher replacement efficiency after wear compared to the housing 1.

[0036] In some embodiments, refer to Figure 1 and Figure 2The plurality of support portions 5 include a first support portion 50 and a second support portion 51. In the direction surrounding the axis 21 of the rotation shaft 2, the output portion 4 is located between the first support portion 50 and the second support portion 51. The intervals between the first support portion 50 and the output portion 4, and between the second support portion 51 and the output portion 4, are both less than 90°. In this embodiment, the interval angles between the first support portion 50 and the output portion 4, and between the second support portion 51 and the output portion 4, are the same to further improve the uniform and stable support effect. In other embodiments, the interval angles between the first support portion 50 and the output portion 4, and between the second support portion 51 and the output portion 4, may also be different, which will not be elaborated here. Support portions 5 are provided on both sides of the output portion 4 to further improve the uniformity of the support effect, hinder the rotation of the transmission portion 3, and improve the stability of the transmission portion 3's axial movement along the rotation shaft 2.

[0037] In some embodiments, refer to Figure 2 The multiple support parts 5 include a third support part 52, which is located on the side of the transmission part 3 away from the output part 4. After the transmission part 3 and the output part 4 are in direct contact and subjected to force, the third support part 52 is located in the direction of direct force on the transmission part 3, thereby forming a direct support for the transmission part 3 and transmitting the force to the housing 1, which is beneficial to improving the support effect and stability of the transmission part 3.

[0038] It should be noted that in this embodiment, the support portion 5 can be made of a wear-resistant material such as bearing steel to provide high wear resistance and a low coefficient of friction. (Refer to...) Figure 2 The first support part 50, the second support part 51 and the third support part 52 are arranged in an isosceles triangle, and the support structure is relatively stable.

[0039] In some embodiments, refer to Figure 2 The housing 1 has a first arcuate surface 11 facing the support portion 5, and the support portion 5 has a second arcuate surface 53 that fits against the first arcuate surface 11. The first arcuate surface 11 and the second arcuate surface 53 are easier to process than other shaped structural surfaces, and the precision requirements for their mutual fitting are relatively low.

[0040] In some embodiments, refer to Figure 2 The radius of the second arc surface 53 is smaller than the radius of the first arc surface 11. When assembling the support part 5, the smaller radius of the second arc surface 53 compared to the first arc surface 11 makes it easier to rotate and adjust the position of the support part 5, so as to adjust the fitting effect of the first arc surface 11 and the second arc surface 53, and further reduce the requirements for the machining accuracy of the housing 1 and the support part 5.

[0041] In some embodiments, refer to Figure 1 and Figure 2In response to the axial movement of the transmission part 3 along the rotation axis 2, a sliding support or rolling support is formed between the support part 5 and the transmission part 3. Compared to the relative movement between the support part 5 and the housing 1 caused by the synchronous movement of the support part 5 with the transmission part 3, the sliding or rolling support between the support part 5 and the transmission part 3 reduces wear on the housing 1 and improves the support stability of the support part 5 for the transmission part 3. Furthermore, it is understood that the rolling support can further reduce wear on the support part 5 and the transmission part 3 compared to the sliding support, such as by providing a needle roller structure between the support part 5 and the transmission part 3, which will not be elaborated further here.

[0042] In some embodiments, refer to Figure 1 The support portion 5 extends axially along the rotation axis 2, and the extension dimension of the support portion 5 along the rotation axis 2 is not less than the moving distance of the transmission portion 3 along the rotation axis 2. This helps to ensure that the support portion 5 is always supported on the outer periphery of the transmission portion 3 during the movement of the transmission portion 3.

[0043] In some embodiments, refer to Figure 2 The transmission part 3 has a first contact surface 32 facing the support part 5, and the support part 5 has a second contact surface 54 that contacts the first contact surface 32. The first contact surface 32 is parallel to the second contact surface 54. In this embodiment, the transmission part 3 and the support part 5 are directly contacted through the first contact surface 32 and the second contact surface 54. The mutual parallel first contact surface 32 and the second contact surface 54 reduce the resistance to relative sliding between the transmission part 3 and the support part 5, which helps the support part 5 to hinder the rotational tendency of the transmission part 3.

[0044] In some embodiments, refer to Figure 2 The housing 1 is provided with a limiting part 12, which abuts against the support part 5 in the axial direction of the rotating shaft 2. In this embodiment, the limiting part 12 can be a retaining wall structure formed on the inner wall of the housing 1, which serves as an assembly reference for the support part 5 during assembly, so as to facilitate quick positioning of the support part 5 and restrict its movement. In other embodiments, the support part 5 can also be limited by means such as assembling a limiting structure inside the housing 1 to block the support part 5 or by creating a slot for the support part 5 to be embedded, which will not be described in detail here.

[0045] In addition, it should be noted that, referring to Figure 1 In this embodiment, the screw section and the transmission section 3 form a ball bearing 6 lead screw structure. The screw section has a first helical groove 200 relative to the transmission section 3, and the transmission section 3 has a second helical groove 30 relative to the screw section. Ball bearings 6 are filled between the first helical groove 200 and the second helical groove 30 to form a transmission engagement between the screw section and the transmission section 3. In other embodiments, the screw section and the transmission section 3 may also adopt a threaded engagement structure, etc.

[0046] Accordingly, this application provides a vehicle that includes the aforementioned electric power steering system. It is understood that the vehicle can possess all the technical features and corresponding beneficial effects of the aforementioned electric power steering system, which will not be elaborated upon here.

[0047] The electric steering device and automobile provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electric steering device, characterized in that, include: Shell (1); A rotating shaft (2) is at least partially disposed within the housing (1) and rotatable relative to the housing (1), the rotating shaft (2) having a screw section (20) in its own axial direction; The transmission part (3) is sleeved on the screw section (20) and engages with the screw section (20). In response to the rotation of the rotating shaft (2), the transmission part (3) is configured to be able to move along the axial direction of the rotating shaft (2). The outer periphery of the transmission part (3) is provided with a plurality of first transmission teeth (31) along the axial direction of the rotating shaft (2). The output part (4) is rotatable relative to the housing (1). The output part (4) is provided with a plurality of second transmission teeth (40) around its own rotation axis (21). The second transmission teeth (40) mesh with the first transmission teeth (31). Multiple support parts (5) are distributed between the outer periphery of the transmission part (3) and the housing (1) around the axis (21) of the rotation shaft (2), and the multiple support parts (5) respectively contact the housing (1) and the transmission part (3); In the direction of the axis (21) surrounding the rotation axis (2), the distance between at least one of the support parts (5) and the output part (4) is greater than 90°, and the distance between at least one of the support parts (5) and the output part (4) is less than 90°.

2. The electric steering device according to claim 1, characterized in that, The plurality of support portions (5) include a first support portion (50) and a second support portion (51). In the direction of the axis (21) surrounding the rotation axis (2), the output portion (4) is located between the first support portion (50) and the second support portion (51), and the interval between the first support portion (50) and the output portion (4) and the interval between the second support portion (51) and the output portion (4) are both less than 90°.

3. The electric steering device according to claim 1 or 2, characterized in that, The plurality of support portions (5) include a third support portion (52), which is provided on the side of the transmission portion (3) opposite to the output portion (4).

4. The electric steering device according to claim 1, characterized in that, The housing (1) has a first arc surface (11) facing the support portion (5), and the support portion (5) has a second arc surface (53) that fits the first arc surface (11).

5. The electric steering device according to claim 4, characterized in that, The radius of the second arc surface (53) is smaller than the radius of the first arc surface (11).

6. The electric steering device according to claim 1, characterized in that, In response to the axial movement of the transmission part (3) along the rotation axis (2), a sliding support or a rolling support is formed between the support part (5) and the transmission part (3).

7. The electric steering device according to claim 6, characterized in that, The support part (5) extends along the axial direction of the rotating shaft (2), and the extension dimension of the support part (5) along the axial direction of the rotating shaft (2) is not less than the moving distance of the transmission part (3) along the axial direction of the rotating shaft (2).

8. The electric steering device according to claim 6, characterized in that, The transmission part (3) has a first contact surface (32) facing the support part (5), and the support part (5) has a second contact surface (54) that contacts the first contact surface (32), and the first contact surface (32) is parallel to the second contact surface (54).

9. The electric steering device according to claim 6, characterized in that, The housing (1) is provided with a limiting part (12), which abuts against the support part (5) in the axial direction of the rotating shaft (2).

10. A car, characterized in that, Includes the electric steering device as described in any one of claims 1 to 9.

Images