Coaxial steering-by-wire device and vehicle having it

Abstract

The utility model discloses a coaxial line control steering gear and vehicle with it. Coaxial line control steering gear includes shell, pull rod subassembly, transmission part, motor and planetary reduction subassembly, and shell has installation cavity, and the outside of shell has installation unit. Pull rod subassembly is worn in installation cavity, and pull rod subassembly is movable along the axial direction of pull rod subassembly relative to shell, and pull rod subassembly has outer spiral section. Transmission part is coaxial and is set on the outer spiral section, and the outer spiral section and transmission part form the rotation pair. The motor is hollow shaft motor, and the motor is connected with shell and is coaxial with the outer spiral section. The input end of planetary reduction subassembly is connected with the drive end of motor, and the output end of planetary reduction subassembly is connected with transmission part to drive pull rod subassembly to move along its axial direction relative to shell. The utility model is coaxial arrangement as a whole, and the overall structure is more compact, and the occupied space is smaller, and the integration level is higher, and the assembly space requirement to chassis is lower, and the practicality is better.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle technology, specifically relating to a coaxial line-controlled steering device and a vehicle having the same. Background Technology

[0002] In related technologies, the actuators of steer-by-wire systems largely follow the traditional electric power steering scheme, that is, the actuators adopt an offset motor arrangement or a direct insertion arrangement. The offset motor arrangement achieves the conversion from rotation to linear motion by driving the lead screw through belt drive or gear drive; the direct insertion arrangement adopts a vertical arrangement of the motor and steering rack, and achieves the conversion from rotation to linear motion through the conversion of the pinion and rack. Summary of the Invention

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a coaxial steering device with a compact structure and stable performance.

[0005] An embodiment of this utility model proposes a vehicle.

[0006] The coaxial line-controlled steering device of this utility model embodiment includes:

[0007] The housing has a mounting cavity, and the outer side of the housing has a mounting portion;

[0008] A pull rod assembly, which passes through the mounting cavity and is movable relative to the housing along the axial direction of the pull rod assembly, the pull rod assembly having an external helical section;

[0009] A transmission component having an inner helical section, the transmission component being coaxial with the pull rod assembly and sleeved on the outer helical section, the outer helical section and the inner helical section forming a rotary pair;

[0010] The motor is a hollow shaft motor, which is connected to the housing and is coaxially arranged with the outer helical section;

[0011] A planetary reduction gear assembly, wherein the input end of the planetary reduction gear assembly is connected to the drive end of the motor, and the output end of the planetary reduction gear assembly is connected to the transmission member to drive the tie rod assembly to move relative to the housing along its axial direction.

[0012] In this embodiment of the coaxial steering device, the motor is a hollow shaft motor, which allows the motor and the tie rod assembly to be coaxially arranged. Simultaneously, a planetary reduction gear assembly is used to achieve the transmission connection between the motor and the transmission components, ensuring the coaxial arrangement of the overall actuator and guaranteeing stable operation. This invention has a more compact overall structure, occupies less space, has a higher degree of integration, requires less chassis assembly space, and is more practical.

[0013] In some embodiments, the inner wall of the motor housing of the motor has a drive cavity and a reduction cavity, the winding components of the motor are disposed in the drive cavity, and the planetary reduction assembly is disposed in the reduction cavity.

[0014] In some embodiments, the inner wall of the reduction chamber has a gear ring, the planetary reduction assembly includes a sun gear, planet gears and a planet carrier connected together, the drive end of the motor is connected to the sun gear, a plurality of planet gears are arranged circumferentially on the sun gear and rotatably connected to the planet carrier, the planet gears mesh with the gear ring and the sun gear, and the transmission member is connected to the planet carrier.

[0015] In some embodiments, the housing includes a first housing and a second housing, which are respectively disposed at both ends of the axial direction of the motor and are connected to the motor housing of the motor.

[0016] In some embodiments, a first bearing is provided between the motor shaft and the motor housing, a second bearing is provided between the outer wall of the transmission component and the inner wall of the first housing, the planetary carrier is connected to the transmission component via a connector, and a third bearing is provided between the motor shaft and the inner wall of the second housing.

[0017] In some embodiments, the motor is a dual-winding motor.

[0018] In some embodiments, the rotary pair between the transmission member and the outer helical segment is a ball screw pair.

[0019] In some embodiments, the pull rod assembly includes:

[0020] A main drive rod, wherein the outer helical segment is disposed on the main drive rod, and the main drive rod has a first end and a second end;

[0021] The steering tie rod consists of two rods, which are respectively located at the first end and the second end of the main drive rod. The steering tie rod and the main drive rod are connected by an inner ball joint.

[0022] In some embodiments, the two ends of the main drive rod extend out of the end of the housing, and a protective cover is provided at the end of the housing. One end of the protective cover is connected to the housing, and the other end of the protective cover is connected to the steering tie rod so that the inner ball joint is located inside the cavity of the protective cover.

[0023] The vehicle of this utility model embodiment includes the coaxial line-controlled steering device described in any of the above embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the coaxial line-controlled steering device according to an embodiment of the present invention.

[0025] Figure 2 This is a cross-sectional schematic diagram of the coaxial line-controlled steering device according to an embodiment of the present utility model.

[0026] Figure 3 This is a partially enlarged schematic diagram of the coaxial line-controlled steering device according to an embodiment of this utility model.

[0027] Figure 4 This is a schematic diagram of a dual-winding motor in a coaxial line-controlled steering device according to an embodiment of this utility model.

[0028] Figure label:

[0029] 100. Coaxial line-controlled steering device;

[0030] 1. Outer shell; 11. First shell; 12. Second shell; 13. Protective cover; 14. Mounting part;

[0031] 2. Tie rod assembly; 21. Main drive rod; 22. Steering tie rod; 23. Inner ball joint;

[0032] 3. Transmission components;

[0033] 4. Motor; 41. Motor housing; 42. Shaft; 43. Winding assembly; 44. Gear ring;

[0034] 5. Planetary reduction gear assembly; 51. Sun gear; 52. Planet gears; 53. Planet carrier;

[0035] 61. First bearing; 62. Second bearing; 63. Third bearing. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] See Figures 1-4The coaxial line control steering device 100 of this utility model embodiment includes a housing 1, a tie rod assembly 2, a transmission component 3, a motor 4, and a planetary reduction assembly 5.

[0038] The housing 1 has a mounting cavity and is used to protect the tie rod assembly 2 and the transmission component 3. The motor housing 41 of the motor 4 can be directly connected to the housing 1, or a part of the housing 1 can be used as the motor housing 41. The housing 1 can be connected to the chassis, thereby realizing the installation of the coaxial line steering device 100.

[0039] In this embodiment, the pull rod assembly 2 passes through the mounting cavity. The pull rod assembly 2 is movable relative to the outer shell 1 along its axial direction. Both ends of the pull rod assembly 2 are used to connect to two wheels respectively, thereby enabling the wheels to steer when the pull rod assembly 2 moves relative to the outer shell 1. The pull rod assembly 2 has an outer helical section. The transmission member 3 has an inner helical section, and the transmission member 3 is coaxial and sleeved on the outer helical section, forming a revolute pair between the outer and inner helical sections. When the transmission member 3 is driven to rotate, its rotational motion can be converted into linear motion of the pull rod assembly 2.

[0040] In this embodiment, motor 4 is a hollow shaft motor 4, and the rotating shaft 42 of motor 4 is a hollow shaft. Motor 4 is connected to the outer casing 1 and is coaxially arranged with the outer helical section. In other words, a section of the tie rod assembly 2 passes through the rotating shaft 42 of motor 4, making motor 4 and tie rod assembly 2 coaxially arranged, resulting in better overall compactness and integration. The input end of planetary reduction assembly 5 is connected to the drive end of motor 4, and the output end of planetary reduction assembly 5 is connected to transmission component 3 to drive tie rod assembly 2 to move relative to outer casing 1 along its axial direction. It can be understood that planetary reduction assembly 5 and tie rod assembly 2 are also coaxially arranged. The drive end of rotating shaft 42 of motor 4 is connected to sun gear 51 of planetary reduction assembly 5. Sun gear 51 drives planet gear 52 and planet carrier 53 of planetary reduction assembly 5 to rotate. Planet carrier 53 is connected to transmission component 3, thereby realizing the transmission and adjustment of force.

[0041] Preferably, the rotating pair between the transmission component 3 and the outer helical section is a ball screw pair, which is more stable in operation, has high transmission efficiency and high precision, and the ball screw pair has low friction loss during operation, longer service life and greater reliability.

[0042] In this embodiment of the coaxial linear control steering device 100, the motor 4 is a hollow shaft motor 4, thereby enabling the motor 4 and the tie rod assembly 2 to be coaxially arranged. Simultaneously, the planetary reduction assembly 5 is used to achieve the transmission connection between the motor 4 and the transmission component 3, ensuring the coaxial arrangement of the overall actuator and guaranteeing stable operation. This invention has a more compact overall structure, occupies less space, has a higher degree of integration, requires less chassis assembly space, and is more practical.

[0043] In some embodiments, the inner wall of the motor housing 41 of the motor 4 has a drive cavity and a reduction cavity. The winding component 43 of the motor 4 is disposed in the drive cavity, and the planetary reduction assembly 5 is disposed in the reduction cavity. The winding component 43 may include a stator and a rotor. The stator is connected to the motor housing 41, and the rotor is connected to the shaft 42 of the motor 4. Both the stator and the rotor are arranged in the drive cavity, and the planetary reduction assembly 5 is arranged in the reduction cavity. This achieves the integration of the motor 4 and the planetary reduction assembly 5, resulting in better overall structural stability, avoiding failures during application, and reducing the failure rate.

[0044] Furthermore, the inner wall of the reduction chamber has a gear ring 44. The planetary reduction assembly 5 includes a sun gear 51, planet gears 52, and a planet carrier 53 connected together. The drive end of the motor 4 is connected to the sun gear 51. Multiple planet gears 52 are arranged circumferentially around the sun gear 51 and rotatably connected to the planet carrier 53. The planet gears 52 can be rotatably connected to the planet carrier 53 via a connecting shaft. The planet carrier 53 can be generally disk-shaped. The planet carrier 53, the rotating shaft 42 of the motor 4, the tie rod assembly 2, and the transmission component 3 are all coaxially arranged. The number of planet gears 52 can be three, four, etc. Each planet gear 52 meshes with the gear ring 44 and the sun gear 51. Thus, when the sun gear 51 rotates, the planet gears 52 not only rotate on their own axis but also revolve around the sun gear 51, thereby driving the planet carrier 53 to rotate. Since the transmission component 3 is connected to the planet carrier 53, the transmission component 3 will rotate synchronously, converting the rotational motion of the transmission component 3 into the linear motion of the tie rod assembly 2.

[0045] In some embodiments, the outer casing 1 includes a first casing 11 and a second casing 12, which are respectively located at both ends of the axial direction of the motor 4. The first casing 11 and the second casing 12 are connected to the motor housing 41 of the motor 4. Along the length direction of the pull rod assembly 2, the first casing 11, the motor housing 41, and the second casing 12 are arranged sequentially. A portion of the pull rod assembly 2 is located in the inner cavity of the first casing 11, the motor housing 41, and the second casing 12. At the same time, the transmission member 3 and the outer helical section are also located in the inner cavity of the first casing 11, the motor housing 41, and the second casing 12, thereby protecting the rotating pair and the actuator.

[0046] Furthermore, a first bearing 61 is provided between the rotating shaft 42 of the motor 4 and the motor housing 41, a second bearing 62 is provided between the outer wall of the transmission component 3 and the inner wall of the first housing 11, the planetary carrier 53 is connected to the transmission component 3 via a connector, and a third bearing 63 is provided between the rotating shaft 42 of the motor 4 and the inner wall of the second housing 12. In this embodiment, the rotating shaft 42 of the motor 4 and the transmission component 3 are supported by the first bearing 61, the second bearing 62, and the third bearing 63, ensuring the stability of the operation between the motor 4 and the transmission component 3. At the same time, it can further improve the coaxiality between components and avoid affecting the lifespan of components or causing damage to components due to deviation.

[0047] See Figure 4 In some embodiments, the motor 4 is a dual-winding motor 4, which can achieve control domain isolation at the control end online at point s, thereby improving the stability and safety of the steering device operation and providing better controllability.

[0048] In some embodiments, the tie rod assembly 2 includes a main drive rod 21 and a steering tie rod 22. An outer helical section is disposed on the main drive rod 21, which has a first end and a second end. There are two steering tie rods 22, which are respectively disposed at the first end and the second end of the main drive rod 21. The steering tie rods 22 and the main drive rod 21 are connected by an inner ball joint 23. The steering tie rods 22 can swing freely relative to the main drive rod 21, thereby achieving an effective connection between the main drive rod 21 and the wheel, resulting in smoother steering.

[0049] Furthermore, the outer casing 1 is provided with mounting portions 14. For example, two mounting portions 14 are provided on both the first casing 11 and the second casing 12. The coaxial line-controlled steering device 100 is mounted on the vehicle chassis through four mounting portions 14. The two ends of the main drive rod 21 extend out of the ends of the outer casing 1. A protective cover 13 is provided at the ends of the outer casing 1. One end of the protective cover 13 is connected to the outer casing 1, and the other end of the protective cover 13 is connected to the steering tie rod 22 so that the inner ball joint 23 is located in the inner cavity of the protective cover 13. It can be understood that when the outer casing 1 includes the first casing 11 and the second casing 12, a protective cover 13 is provided at the end of the first casing 11 away from the second casing 12, and a protective cover 13 is provided at the end of the second casing 12 away from the first casing 11. The protective cover 13 adopts a telescopic and deformable bellows cover. When the steering tie rod 22 swings relative to the main drive rod 21, the protective cover 13 will not affect or interfere with the movement of the steering tie rod 22, and can protect the inner ball joint 23 from interference and influence from the external environment.

[0050] The vehicle of this embodiment includes the coaxial line-controlled steering device 100 of any of the above embodiments. The beneficial effects achieved by the vehicle in this embodiment are the same as those achieved by the coaxial line-controlled steering device 100 in the above embodiments, and therefore will not be described again.

[0051] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0052] 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rack-and-pinion steering device, characterized by comprising: include: The housing has a mounting cavity, and the outer side of the housing has a mounting portion; A pull rod assembly, which passes through the mounting cavity and is movable relative to the housing along the axial direction of the pull rod assembly, the pull rod assembly having an external helical section; A transmission component having an inner helical section, the transmission component being coaxial with the pull rod assembly and sleeved on the outer helical section, the outer helical section and the inner helical section forming a rotary pair; The motor is a hollow shaft motor, which is connected to the housing and is coaxially arranged with the outer helical section; A planetary reduction gear assembly, wherein the input end of the planetary reduction gear assembly is connected to the drive end of the motor, and the output end of the planetary reduction gear assembly is connected to the transmission member to drive the tie rod assembly to move relative to the housing along its axial direction.

2. A rack-and-pinion steering apparatus according to claim 1, wherein The inner wall of the motor housing of the motor has a drive cavity and a reduction cavity. The winding components of the motor are located in the drive cavity, and the planetary reduction assembly is located in the reduction cavity.

3. A rack-and-pinion steering apparatus according to claim 2, wherein The inner wall of the reduction chamber has a gear ring, the planetary reduction assembly includes a sun gear, planet gears and a planet carrier connected together, the drive end of the motor is connected to the sun gear, a plurality of planet gears are arranged in the circumference of the sun gear and are rotatably connected to the planet carrier, the planet gears mesh with the gear ring and the sun gear, and the transmission component is connected to the planet carrier.

4. A rack-and-pinion steering apparatus according to claim 3, wherein The outer casing includes a first casing and a second casing, which are respectively located at both ends of the axial direction of the motor and are connected to the motor housing.

5. A rack and pinion power steering apparatus according to claim 4, wherein The motor shaft has a first bearing between it and the motor housing, the outer wall of the transmission component has a second bearing between it and the inner wall of the first housing, the planetary carrier is connected to the transmission component by a connector, and the motor shaft has a third bearing between it and the inner wall of the second housing.

6. The rack-and-pinion steering apparatus of claim 1, wherein The motor is a dual-winding motor.

7. The rack-and-pinion steering apparatus of claim 1, wherein The rotary pair between the transmission component and the outer helical segment is a ball screw pair.

8. The rack-and-pinion steering apparatus of claim 1, wherein The tie rod assembly includes: A main drive rod, wherein the outer helical segment is disposed on the main drive rod, and the main drive rod has a first end and a second end; The steering tie rod consists of two rods, which are respectively located at the first end and the second end of the main drive rod. The steering tie rod and the main drive rod are connected by an inner ball joint.

9. A rack-and-pinion steering apparatus according to claim 8, wherein The two ends of the main drive rod extend out of the end of the housing. A protective cover is provided at the end of the housing. One end of the protective cover is connected to the housing, and the other end of the protective cover is connected to the steering tie rod so that the inner ball joint is located inside the cavity of the protective cover.

10. A vehicle characterized by comprising: The coaxial steering device includes any one of claims 1 to 9.

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