Speed reducer, steering structure and vehicle

Abstract

The invention discloses a speed reducer, a steering structure and a vehicle. The speed reducer comprises a driving motor, a planetary roller and a roller lead screw, and the driving motor comprises a stator and a rotor; the planetary roller is rotationally connected with the rotor, and the rotating axis of the planetary roller and the rotating axis of the rotor are parallel and spaced; the roller lead screw can move in the axial direction of the roller lead screw, the planetary roller comprises a threaded part, and the threaded part is in threaded connection with the roller lead screw. According to the speed reducer, the threaded part is in threaded connection with the roller lead screw, when the planetary roller rotates, the threaded part rotates, the threaded part drives the roller lead screw, and the roller lead screw moves in the axial direction of the roller lead screw. The planetary roller is rotationally connected with the rotor, a planet carrier of the planetary roller and the rotor are integrated into a whole, the axial size of the speed reducer is greatly reduced, the rotating axis of the planetary roller and the rotating axis of the rotor are parallel and spaced, the planetary roller and the rotor can rotate relatively, and revolution and rotation of the planetary roller can be achieved conveniently.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of vehicle steering, and in particular to a speed reducer, a steering structure and a vehicle. Background Art

[0002] In the prior art, the vehicle's reducer is configured with an assembly structure of planetary rollers and roller screws, and deceleration is achieved through transmission between the planetary rollers and the roller screws. However, the planetary rollers need to be configured with a planetary carrier for limiting the planetary rollers, which makes the axial volume of the reducer larger. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a reducer, which reduces the axial volume of the reducer.

[0004] The present invention also provides a steering structure, which includes the above-mentioned speed reducer.

[0005] The present invention also provides a vehicle, comprising the above-mentioned steering structure.

[0006] According to an embodiment of the present invention, the reducer includes a drive motor, planetary rollers and a roller screw, the drive motor includes a stator and a rotor; the planetary rollers are rotatably connected to the rotor, and the rotation axis of the planetary rollers is parallel to and spaced apart from the rotation axis of the rotor; the roller screw is movable along the axial direction of the roller screw, the planetary rollers include a threaded portion, and the threaded portion is threadedly connected to the roller screw.

[0007] According to an embodiment of the present invention, a reducer is provided by threading a threaded portion into a roller screw. When the planetary rollers rotate, the threaded portion rotates, driving the roller screw, thereby causing the roller screw to move axially. The planetary rollers are rotationally connected to the rotor, and the planetary roller carrier and rotor are integrated into a single piece, significantly reducing the axial size of the reducer. The planetary rollers' rotational axes are parallel to and spaced apart from the rotor's rotational axis, allowing the planetary rollers and rotor to rotate relative to each other, facilitating the planetary rollers' orbital and rotational motion.

[0008] In some embodiments of the present invention, there are a plurality of planetary rollers, and the plurality of planetary rollers are spaced apart along the circumferential direction of the rotor.

[0009] In some embodiments of the present invention, the reducer further includes: an outer ring gear, the outer ring gear is relatively stationary with respect to the stator, the inner circumferential wall of the outer ring gear is provided with an internal gear, the planetary roller further includes a gear portion, the gear portion and the threaded portion are arranged along the axial direction of the planetary roller, and the internal gear is engaged with the gear portion.

[0010] In some embodiments of the present invention, the number of teeth of the internal gear is Z3, and the number of teeth of the gear portion is Z 2’ The number of thread heads on the threaded portion is Z2, the number of thread heads on the outer peripheral wall of the roller screw is Z1, and the transmission ratio between the roller screw and the rotor is i 1H And satisfy:

[0011] In some embodiments of the present invention, the reducer further includes: a planetary plate, which is provided at one end of the planetary roller away from the rotor and is rotationally connected to the outer ring gear, and a plurality of the planetary rollers are rotationally connected to the planetary plate.

[0012] In some embodiments of the present invention, in a cross section passing through the axis of the roller screw, the profile of the thread on the outer peripheral wall of the roller screw is trapezoidal.

[0013] In some embodiments of the present invention, the reducer further includes a bearing component, wherein the bearing component is provided between the rotor and the stator.

[0014] In some embodiments of the present invention, there are two bearing members, and the two bearing members are respectively arranged at two ends of the rotor in the axial direction.

[0015] In some embodiments of the present invention, the reducer further includes: a housing assembly, the housing assembly defines an accommodating space, the drive motor, the planetary rollers and the roller screw are arranged in the accommodating space, the housing assembly is fixedly connected to the stator, the housing assembly is provided with an open opening, and part of the roller screw is arranged in the open opening.

[0016] In some embodiments of the present invention, the housing assembly includes: a first housing; and a second housing, wherein the first housing and the second housing jointly define a receiving space, and the first housing is provided with the opening.

[0017] In some embodiments of the present invention, the reducer further includes: a sealing sleeve, the sealing sleeve is provided between the inner wall of the open port and the roller screw, and the sealing sleeve is fixedly connected to the housing assembly.

[0018] The steering structure according to the embodiment of the present invention includes the above-mentioned speed reducer.

[0019] According to an embodiment of the present invention, the steering structure utilizes a threaded portion threadedly connected to the roller screw. When the planetary roller rotates, the threaded portion rotates, driving the roller screw, thereby achieving axial movement of the roller screw. The planetary rollers are rotatably connected to the rotor, and the planetary roller carrier and rotor are integrated into a single piece, significantly reducing the axial size of the reducer. The planetary rollers' rotational axes are parallel to and spaced apart from the rotor's rotational axis, allowing the planetary rollers and rotor to rotate relative to each other, facilitating both orbital and rotational motion of the planetary rollers.

[0020] A vehicle according to an embodiment of the present invention includes the above-mentioned steering structure.

[0021] In a vehicle according to an embodiment of the present invention, a threaded portion is threadedly connected to a roller screw. When the planetary rollers rotate, the threaded portion rotates, driving the roller screw, thereby moving the roller screw axially. The planetary rollers are rotationally connected to the rotor, and the planetary roller carrier and rotor are integrated into a single piece, significantly reducing the axial size of the reducer. The planetary rollers' rotational axes are parallel to and spaced apart from the rotor's rotational axis, allowing the planetary rollers and rotor to rotate relative to each other, facilitating both orbital and rotational motion of the planetary rollers.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1 is an exploded view of a reducer according to an embodiment of the present invention;

[0025] Figure 2 is a cross-sectional view of a reducer passing through the axis of a roller screw according to an embodiment of the present invention;

[0026] Figure 3 is a cross-sectional view in the axial direction of a reducer according to an embodiment of the present invention;

[0027] Figure 4 FIG. 1 is a cross-sectional view of another position in the axial direction of the speed reducer according to the embodiment of the present invention.

[0028] Reference numerals:

[0029] 100. Reducer;

[0030] 1. Drive motor; 11. Stator; 111. First mounting lug; 12. Rotor; 121. First mounting hole; 13. Accommodation space; 2. Planetary roller; 21. Threaded portion; 22. Gear portion; 3. Roller screw; 4. Outer ring gear; 41. Second mounting lug; 411. Waist-shaped hole; 42. Internal gear; 5. Planetary plate; 51. Second mounting hole; 6. Bearing; 7. Housing assembly; 71. First housing; 72. Second housing; 721. Opening; 8. Sealing sleeve. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, 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 cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] Reference below Figure 1-Figure 4 A speed reducer 100 according to an embodiment of the present invention will be described.

[0035] like Figure 1 As shown, the reducer 100 according to an embodiment of the present invention includes a drive motor 1 , planetary rollers 2 and a roller screw 3 .

[0036] Specifically, the drive motor 1 includes a stator 11 and a rotor 12 , the planetary rollers 2 are rotationally connected to the rotor 12 , and the planetary carrier of the planetary rollers 2 and the rotor 12 are integrated into one piece, which greatly reduces the axial volume of the reducer 100 .

[0037] like Figure 3 and Figure 4 As shown, the rotation axis of the planetary roller 2 is parallel to and spaced apart from the rotation axis of the rotor 12. While the rotor 12 drives the planetary roller 2 to revolve, the planetary roller 2 can also rotate on its own.

[0038] The connection method between the planetary roller 2 and the rotor 12 is not limited, as long as the planetary roller 2 and the rotor 12 can be connected in a rotating manner. For example, a first mounting hole 121 is provided on the axial end surface of the rotor 12, and the axial direction of the planetary roller 2 (such as Figure 1 One end of the planetary roller 2 extends into the first mounting hole 121, and the planetary roller 2 and the rotor 12 are transitionally matched. The planetary roller 2 and the rotor 12 can rotate relative to each other, which is convenient for realizing the revolution and rotation of the planetary roller 2.

[0039] like Figure 1 and Figure 2 As shown, the roller screw 3 is rotated in the axial direction of the roller screw 3 (as shown in FIG. Figure 1 The planetary roller 2 is movable in the first direction (shown). The planetary roller 2 includes a threaded portion 21, which is threadedly connected to the roller screw 3. The threaded portion 21 and the roller screw 3 are in line contact, and the rigidity between the threaded portion 21 and the roller screw 3 is high. When the planetary roller 2 rotates, the threaded portion 21 rotates, and the threaded portion 21 drives the roller screw 3, causing the roller screw 3 to move along the axial direction of the roller screw 3.

[0040] The moving speed of the roller screw 3 along the axial direction of the roller screw 3 can be changed by changing the thread lead of the roller screw 3 and the threaded portion 21. The smaller the lead, the more turns of the roller screw 3 that the planetary roller 2 needs to rotate to move a unit distance, thereby achieving the deceleration effect of the reducer 100.

[0041] According to the reducer 100 of this embodiment, the threaded portion 21 is threadedly connected to the roller screw 3. When the planetary roller 2 rotates, the threaded portion 21 rotates, and the threaded portion 21 drives the roller screw 3, thereby achieving axial movement of the roller screw 3. The planetary rollers 2 are rotatably connected to the rotor 12. The planetary carrier of the planetary rollers 2 and the rotor 12 are integrated into a single piece, greatly reducing the axial volume of the reducer 100. The rotation axis of the planetary rollers 2 is parallel to and spaced apart from the rotation axis of the rotor 12. The planetary rollers 2 and the rotor 12 can rotate relative to each other, facilitating the revolution and rotation of the planetary rollers 2.

[0042] In this embodiment, the stator 11 surrounds the rotor 12 along the circumferential direction of the rotor 12 .

[0043] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, there are multiple planetary rollers 2, and the multiple planetary rollers 2 are arranged at intervals along the circumferential direction of the rotor 12. The multiple planetary rollers 2 can share the load when the rotor 12 rotates, so that the axial and radial stiffness of the roller screw 3 are very excellent, thereby improving the load capacity of the reducer 100.

[0044] In this embodiment, the planetary rollers 2 are evenly spaced along the circumferential direction of the rotor 12. Along the circumferential direction of the rotor 12, the force of the threaded portion 21 on the planetary roller 2 driving the planetary roller 2 is distributed more evenly, thereby increasing the reliability of the movement of the roller screw 3 along the axial direction of the roller screw 3.

[0045] In this embodiment, Figure 3 and Figure 4 As shown, there are three planetary rollers 2. Of course, the present invention is not limited to this. The number of planetary rollers 2 can also be 2, 4, 5, 6, etc.

[0046] In some embodiments of the present invention, Figure 2 As shown, the reducer 100 further includes a housing assembly 7, which defines a housing space 13. The drive motor 1, planetary rollers 2, and roller screw 3 are disposed within the housing space 13. The housing assembly 7 protects the drive motor 1, planetary rollers 2, roller screw 3, and other components within the housing space 13, reducing the risk of damage to the drive motor 1, planetary rollers 2, and roller screw 3 from external impact or contamination from the external environment. The housing assembly 7 is fixedly connected to the stator 11, and the stator 11 is in a stationary state. The housing assembly 7 has an open opening 721, and a portion of the roller screw 3 is disposed within the open opening 721. When the roller screw 3 moves in the axial direction of the roller screw 3, it can extend out of the housing assembly 7 from the open opening 721.

[0047] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the housing assembly 7 includes a first housing 71 and a second housing 72. The first housing 71 and the second housing 72 jointly define a receiving space 13. The first housing 71 is provided with an open opening 721. The housing assembly 7 can be assembled by connecting the first housing 71 and the second housing 72. After the parts in the receiving space 13 are assembled, the first housing 71 and the second housing 72 are assembled, so that the overall assembly process of the reducer 100 is relatively simple.

[0048] In this embodiment, Figure 1 and Figure 2As shown, the first housing 71 and the second housing 72 are arranged in sequence along the axial direction of the reducer 100. The stator 11 is provided with a first mounting lug 111, which extends in the radial direction of the stator 11 and is disposed between the first housing 71 and the second housing 72. The first housing 71, the first mounting lug 111, and the second housing 72 are connected by fasteners. The connection between the first housing 71 and the second housing 72 is relatively simple and convenient, and the connection between the stator 11 and the housing assembly 7 is relatively simple and reliable. At the same time, the fastener connection facilitates disassembly, facilitating the inspection or replacement of other components within the accommodating space 13.

[0049] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the reducer 100 also includes an outer ring gear 4, which is relatively stationary with the stator 11. The inner circumferential wall of the outer ring gear 4 is provided with an internal gear 42. The planetary roller 2 also includes a gear portion 22. The gear portion 22 and the threaded portion 21 are arranged along the axial direction of the planetary roller 2. The internal gear 42 is engaged with the gear portion 22. By changing the gear module of the internal gear 42, the transmission ratio between the internal gear 42 and the gear portion 22 can be changed, thereby achieving a change in the speed of the roller screw 3 moving along the axial direction of the roller screw 3.

[0050] In this embodiment, Figure 2 and Figure 3 As shown, the first housing 71 and the second housing 72 are arranged in sequence along the axial direction of the reducer 100. The stator 11 is provided with a first mounting lug 111, which extends in the radial direction of the stator 11. The outer ring gear 4 is provided with a second mounting lug 41, which extends in the radial direction of the outer ring gear 4. The first mounting lug 111 and the second mounting lug 41 are both arranged between the first housing 71 and the second housing 72. The first housing 71, the first mounting lug 111, the second mounting lug 41 and the second housing 72 are connected by fasteners. The connection between the first housing 71 and the second housing 72 is relatively simple and convenient, and the connection between the stator 11 and the housing assembly 7 is relatively simple and reliable. The connection between the outer ring gear 4 and the housing assembly 7 is also relatively simple and reliable. At the same time, the fastener connection facilitates disassembly, facilitating the inspection or replacement of other components within the accommodating space 13.

[0051] In addition, the mounting hole on the second mounting lug 41 may be a waist-shaped hole 411 , so that the outer gear ring 4 can rotate to a certain extent, thereby preventing damage and deformation of the outer gear ring 4 caused by torsional force.

[0052] In some embodiments of the present invention, the number of teeth of the internal gear 42 is Z3, and the number of teeth of the gear portion 22 is Z 2’The number of thread starts on the threaded portion 21 is Z2, the number of thread starts on the outer wall of the roller screw 3 is Z1, and the transmission ratio between the roller screw 3 and the rotor 12 is i 1H And satisfy:

[0053] It is understandable that the lead (L) = pitch (P) × number of heads (N) is a decisive parameter for transmission speed and thrust. Increasing the number of heads can increase the lead (increase speed) or reduce the pitch (increase accuracy) without sacrificing pitch strength. During the design stage of the reducer 100, the speed of movement of the roller screw 3 along the axial direction of the roller screw 3 can be changed by changing the number of thread heads of the roller screw 3 and the threaded portion 21 or changing the module of the internal gear 42 and the gear portion 22, thereby achieving different deceleration effects of the reducer 100.

[0054] Among them, the several threads and tooth profiles in the present invention have various variations, such as cycloid gears, non-zero-degree arc gears, right-angle threads and circular arc threads, etc. However, the change in tooth profile does not affect the transmission principle itself, so it is still one of the technical solutions of the present invention.

[0055] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the reducer 100 further includes a planetary plate 5, which is disposed at the end of the planetary rollers 2 away from the rotor 12 and is rotatably connected to the outer ring gear 4. Multiple planetary rollers 2 are rotatably connected to the planetary plate 5. The planetary plate 5 can limit the planetary rollers 2 at the end away from the rotor 12, preventing the planetary rollers 2 from disengaging from the outer ring gear 4 or the rotor 12, and preventing the planetary rollers 2 from disengaging from the roller screw 3, thereby increasing the assembly stability of the planetary rollers 2. In this embodiment, the planetary plate 5 and the outer ring gear 4 are transitionally fitted.

[0056] The rotational connection between the planetary plate 5 and the outer ring gear 4 can prevent the planetary plate 5 from hindering the revolution of the planetary rollers 2, so that the revolution of the planetary rollers 2 is smoother.

[0057] The connection method between the planetary rollers 2 and the planetary plate 5 is not limited, as long as the planetary rollers 2 and the planetary plate 5 can be rotatably connected. For example, a second mounting hole 51 is defined on the axial end surface of the planetary plate 5. The end of the planetary roller 2 facing away from the rotor 12 extends into the second mounting hole 51. The planetary rollers 2 and the planetary plate 5 are in a transitional fit, allowing the planetary rollers 2 and the planetary plate 5 to rotate relative to each other, thereby facilitating the orbital and rotational motion of the planetary rollers 2.

[0058] In some embodiments of the present invention, Figure 2As shown, on the cross section through the axis of the roller screw 3, the profile of the thread on the outer peripheral wall of the roller screw 3 is trapezoidal. The roller screw 3 with trapezoidal thread can achieve self-locking when the lead angle λ is less than the equivalent friction angle ρ, so that the roller screw 3 has self-locking ability, and the contact area of ​​the thread is small, which improves the mechanical efficiency of the roller screw 3 and realizes the combination of self-locking and efficiency.

[0059] In some embodiments of the present invention, Figure 1 As shown, the roller screw 3 further includes a bearing 6, which is disposed between the rotor 12 and the stator 11. The bearing 6 ensures smooth rotation of the rotor 12 while limiting the position of the rotor 12, so that the position of the rotor 12 is relatively fixed.

[0060] In some embodiments of the present invention, there are two bearing members 6 , which are respectively provided at both ends of the rotor 12 in the axial direction, to further limit the position of the rotor 12 and make the position of the rotor 12 more reliable.

[0061] In this embodiment, the bearing member 6 is a deep groove ball bearing, which has good bidirectional load adaptability, so that the relative rotation between the stator 11 and the rotor 12 is more reliable.

[0062] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the reducer 100 further includes a sealing sleeve 8, which is disposed between the inner wall of the opening 721 and the roller screw 3. The sealing sleeve 8 is fixedly connected to the housing assembly 7. The sealing sleeve 8 seals the opening 721, preventing dust and impurities in the external environment from entering the accommodating space 13 through the opening 721 and damaging the precise transmission between the planetary rollers 2, the outer ring gear 4, and the roller screw 3. The sealing sleeve 8 and the roller screw 3 are in transitional fit.

[0063] The steering structure according to the embodiment of the present invention includes the above-mentioned speed reducer 100 .

[0064] According to the steering structure of the embodiment of the present invention, by threading the threaded portion 21 into the roller screw 3, when the planetary roller 2 rotates, the threaded portion 21 rotates, and the threaded portion 21 drives the roller screw 3, thereby achieving axial movement of the roller screw 3. The planetary roller 2 is rotatably connected to the rotor 12, and the planetary carrier of the planetary roller 2 and the rotor 12 are integrated into a single piece, which greatly reduces the axial volume of the speed reducer 100. The rotation axis of the planetary roller 2 is parallel to and spaced apart from the rotation axis of the rotor 12. The planetary roller 2 and the rotor 12 can rotate relative to each other, facilitating the revolution and rotation of the planetary roller 2.

[0065] A vehicle according to an embodiment of the present invention includes the above-mentioned steering structure.

[0066] In the vehicle according to the embodiment of the present invention, the threaded portion 21 is threadedly connected to the roller screw 3. When the planetary roller 2 rotates, the threaded portion 21 rotates, driving the roller screw 3, thereby causing the roller screw 3 to move axially. The planetary rollers 2 are rotationally connected to the rotor 12, and the planetary carrier of the planetary rollers 2 and the rotor 12 are integrated into a single piece, greatly reducing the axial volume of the speed reducer 100. The rotation axis of the planetary rollers 2 is parallel to and spaced apart from the rotation axis of the rotor 12. The planetary rollers 2 and the rotor 12 can rotate relative to each other, facilitating the revolution and rotation of the planetary rollers 2.

[0067] The reducer 100 , the steering structure and other components and operations of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses 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 any one or more embodiments or examples.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A reducer, characterized in that: include: A drive motor (1), the drive motor (1) comprising a stator (11) and a rotor (12); a planetary roller (2), the planetary roller (2) being rotatably connected to the rotor (12), the rotation axis of the planetary roller (2) being parallel to and spaced apart from the rotation axis of the rotor (12); A roller screw (3) is movable along the axial direction of the roller screw (3); the planetary roller (2) comprises a threaded portion (21), and the threaded portion (21) is threadedly connected to the roller screw (3).

2. The reducer according to claim 1, characterized in that There are a plurality of planetary rollers (2), and the plurality of planetary rollers (2) are arranged at intervals along the circumferential direction of the rotor (12).

3. The reducer according to claim 2, characterized in that: Also includes: An outer gear ring (4), the outer gear ring (4) and the stator (11) are relatively stationary, the inner peripheral wall of the outer gear ring (4) is provided with an internal gear (42), the planetary roller (2) further includes a gear portion (22), the gear portion (22) and the threaded portion (21) are arranged along the axial direction of the planetary roller (2), and the internal gear (42) is meshed with the gear portion (22).

4. The reducer according to claim 3, characterized in that The number of teeth of the internal gear (42) is Z3, and the number of teeth of the gear portion (22) is Z 2’ The number of thread heads of the threaded portion (21) is Z2, the number of thread heads on the outer peripheral wall of the roller screw (3) is Z1, and the transmission ratio between the roller screw (3) and the rotor (12) is i 1H And satisfy:

5. The reducer according to claim 3, characterized in that: Also includes: A planetary plate (5) is provided at one end of the planetary roller (2) away from the rotor (12) and is rotatably connected to the outer gear ring (4); a plurality of the planetary rollers (2) are rotatably connected to the planetary plate (5).

6. The reducer according to claim 1, characterized in that On a cross section passing through the axis of the roller screw (3), the profile of the thread on the outer peripheral wall of the roller screw (3) is trapezoidal.

7. The reducer according to claim 1, characterized in that Also includes: A bearing component (6) is provided between the rotor (12) and the stator (11).

8. The reducer according to claim 7, characterized in that: There are two bearing components (6), and the two bearing components (6) are respectively arranged at two ends of the rotor (12) in the axial direction.

9. The reducer according to claim 1, characterized in that: Also includes: A housing assembly (7), wherein the housing assembly (7) defines an accommodating space (13), the drive motor (1), the planetary roller (2) and the roller screw (3) are arranged in the accommodating space (13), the housing assembly (7) is fixedly connected to the stator (11), the housing assembly (7) is provided with an open mouth (721), and a portion of the roller screw (3) is arranged in the open mouth (721).

10. The reducer according to claim 9, characterized in that The housing assembly (7) comprises: a first housing (71); The second shell (72), the first shell (71) and the second shell (72) jointly define a receiving space (13), and the first shell (71) is provided with the open opening (721).

11. The reducer according to claim 9, characterized in that Also includes: A sealing sleeve (8), the sealing sleeve (8) being arranged between the inner wall of the open opening (721) and the roller screw (3), and the sealing sleeve (8) being fixedly connected to the housing assembly (7).

12. A steering structure, characterized in that: include: The reducer (100) according to any one of claims 1 to 11.

13. A vehicle, characterized in that: include: The steering structure according to claim 12.

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