Roller assembly, steering wheel and vehicle

Abstract

The application provides a scroll wheel assembly, a steering wheel and a vehicle. The scroll wheel assembly comprises a scroll wheel, an impeller comprising a plurality of shielding portions arranged along a circumferential direction of the impeller, an optical coupler, the impeller being rotatably arranged at the optical coupler, the optical coupler being correspondingly matched with the plurality of shielding portions of the impeller, a gear assembly, the gear assembly being in transmission connection with the scroll wheel and being in transmission connection with the impeller through a driving shaft, and a housing, the scroll wheel being arranged in the housing, the housing having a first mounting hole, the driving shaft being capable of being arranged in the first mounting hole in an axial direction. The scroll wheel assembly, the steering wheel and the vehicle provided by the application can ensure the rotation accuracy of the impeller and the driving shaft connected with the impeller during the rotation of the scroll wheel, so as to ensure the adjustment accuracy of the scroll wheel.

Description

[0001] This application is a divisional application based on application number 202421749575.9, filed on July 23, 2024, by Beijing Rockwells Technology Co., Ltd., entitled "Roller Assembly, Steering Wheel and Vehicle". Technical Field

[0002] This application relates to the field of vehicle technology, and in particular to a roller assembly, steering wheel, and vehicle. Background Technology

[0003] To facilitate driver adjustments to vehicle functions such as audio volume and air conditioning temperature, a manual adjustment wheel is typically installed on the steering wheel.

[0004] Currently, the rotation detection of the roller assembly on the steering wheel is usually achieved through an optocoupler structure. However, when the optocoupler structure detects the roller assembly in a rotating state, it may fail to detect the rotation stably, thus affecting the adjustment accuracy of the roller. Utility Model Content

[0005] The roller assembly, steering wheel, and vehicle provided in this application can ensure the rotational accuracy of the impeller and the drive shaft connected to it during the rotation of the rollers in the roller assembly, thereby ensuring the adjustment accuracy of the rollers.

[0006] This application provides a roller assembly, comprising: a roller; an impeller including a plurality of shielding portions spaced apart along its circumference; an optical coupler including a transmitting portion and a receiving portion, the impeller being rotatably disposed between the transmitting portion and the receiving portion; a gear assembly, which is drivenly connected to the roller and drivenly connected to the impeller via a drive shaft; and a housing in which the roller is mounted, the housing having a through-hole first mounting hole, the first mounting hole being a closed circular hole shape adapted to the outer circumferential surface of the drive shaft, the drive shaft being able to pass through the first mounting hole axially.

[0007] In the roller assembly described above, the drive shaft includes a first shaft segment and a second shaft segment. The diameter of the second shaft segment is larger than that of the first shaft segment. The first mounting hole is a closed circular hole that is adapted to the outer circumferential surface of the second shaft segment. The second shaft segment passes through the first mounting hole along its axial direction.

[0008] In the roller assembly described above, along the axial direction of the roller, the gear assembly and the impeller are respectively located on opposite sides of the roller. The opposite side walls of the housing are respectively provided with a first mounting hole and a second mounting hole. The second mounting hole is a circular hole shape that matches the outer peripheral surface of the first shaft section, and the second mounting hole has an opening.

[0009] In the roller assembly described above, the drive shaft further includes a limiting part protruding from the outer circumferential surface of the first shaft segment. The limiting part has an annular structure, and the outer diameter of the limiting part is smaller than the diameter of the first mounting hole and larger than the diameter of the second mounting hole.

[0010] In the roller assembly described above, along the axial direction of the roller, the gear assembly and the impeller are respectively located on opposite sides of the roller. The opposite side walls of the housing each have a through first mounting hole. The drive shaft has two second shaft segments spaced apart from each other, and the two second shaft segments are rotatably located in the two first mounting holes.

[0011] The roller assembly described above includes a gear assembly comprising a driving gear and a driven gear assembly that are meshed together. The driving gear is coaxially arranged with the roller and rotates in contact with it. The driven gear assembly is driven to the impeller via a drive shaft.

[0012] The roller assembly described above includes a driven gear assembly comprising a first driven gear and a second driven gear. The second driven gear has the same diameter as the driving gear. The first driven gear is meshed with both the driving gear and the second driven gear. The diameters of both the driving gear and the second driven gear are smaller than the diameter of the first driven gear. The second driven gear is coaxially mounted with the impeller and rotatably connected to it via a drive shaft. The diameter of the second driven gear is smaller than the diameter of the first mounting hole.

[0013] In the roller assembly described above, the drive gear and the roller are connected by a rotating shaft. The two ends of the rotating shaft are respectively connected to the rotation center of the drive gear and the rotation center of the roller. The housing also has a through-hole for rotating the rotating shaft, which is rotatably located within the rotating hole.

[0014] The roller assembly described above includes a connecting shaft protruding from the housing towards the gear assembly. The rotation center of the first driven gear has a through-hole, through which the first driven gear rotatably connects with the connecting shaft.

[0015] On the other hand, this application also provides a steering wheel, wherein the steering wheel includes the above-mentioned roller assembly, the steering wheel also includes a PCB board, and the optocoupler is mounted on the surface of the PCB board via SMT surface mount.

[0016] In another aspect, this application also provides a vehicle, wherein the vehicle includes the aforementioned steering wheel.

[0017] The roller assembly of this application includes a roller, an impeller, an optical coupler, a housing, and a gear assembly. The roller is integrally installed inside the housing and is connected to the gear assembly via a drive shaft. Since the first mounting hole on the housing matches the outer circumferential shape of the drive shaft, the drive shaft can be engaged in the first mounting hole. When the roller drives the gear assembly to rotate, the drive shaft connected to the gear assembly will not experience axial movement, ensuring the rotational accuracy of the drive shaft. Since the impeller connected to the drive shaft includes multiple blocking parts spaced circumferentially, a detection light beam can be formed between the emitting and receiving parts of the optical coupler. The rotation of the impeller enables the optical coupler to detect the blocking state of the detection light beam by the blocking parts, allowing the optical coupler to stably respond to the rotational state of the roller, thereby ensuring the adjustment accuracy of the roller. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the roller assembly provided in the embodiments of this application;

[0019] Figure 2 This is a partial structural schematic diagram of the roller assembly provided in an embodiment of this application.

[0020] Explanation of icon numbers:

[0021] 10. Roller; 20. Impeller; 21. Drive shaft; 211. First shaft section; 212. Second shaft section; 213. Limiting part; 22. Blocking part; 30. Optical coupler; 31. Transmitting part; 32. Receiving part; 40. Housing; 41. First mounting hole; 42. Second mounting hole; 43. Rotating hole; 50. Gear assembly; 51. Driving gear; 52. Driven gear assembly; 521. First driven gear; 522. Second driven gear; 523. Connecting hole;

[0022] 100. Roller assembly; 200. PCB board. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0024] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0025] like Figure 1 and Figure 2As shown, this application embodiment provides a roller assembly, which includes: a roller 10; an impeller 20, the impeller 20 including a plurality of shielding portions 22 spaced apart along its circumference; an optical coupler 30, the optical coupler 30 including a transmitting portion 31 and a receiving portion 32, the impeller 20 being rotatably disposed between the transmitting portion 31 and the receiving portion 32; a gear assembly 50, which is drivenly connected to the roller 10 and drivenly connected to the impeller 20 via a drive shaft 21; and a housing 40, in which the roller 10 is installed, the housing 40 having a through first mounting hole 41, the first mounting hole 41 being a closed circular hole shape adapted to the outer circumferential surface of the drive shaft 21, the drive shaft 21 being able to pass through the first mounting hole 41 along its axial direction.

[0026] In specific implementation, the roller assembly 100 of this application embodiment includes a roller 10, an impeller 20, an optical coupler 30, a housing 40, and a gear assembly 50. The roller 10 is installed inside the housing 40 and is connected to the gear assembly 50 via a drive shaft 21. The gear assembly 50 is also connected to the impeller 20 via a drive shaft 21. The transmission of the multiple gears in the gear assembly 50 can change the transmission ratio between the roller 10 and the impeller 20. Since the impeller 20, which is connected to the drive shaft 21, includes multiple blocking parts 22 spaced apart along its circumference, the rotation of the impeller 20 can enable the optical coupler 30 to detect the blocking state of the blocking parts 22. This allows the optical coupler 30 to reflect the rotation state of the roller 10 through the rotation state of the impeller 20. Under the transmission action of the gear assembly 50, the rotation accuracy detection of the roller 10 by the optical coupler 30 is improved.

[0027] The optical coupler 30 includes a transmitter 31 and a receiver 32 spaced apart. The transmitter 31 can emit a light source toward the receiver 32. The impeller 20 is rotatably disposed between the transmitter 31 and the receiver 32, and the rotation direction of the impeller 20 is perpendicular to the light source direction of the transmitter 31. When the impeller 20 rotates, a plurality of circumferentially spaced blocking parts 22 can intermittently block the light source emitted by the transmitter 31, so that the receiver 32 receives intermittent light source signals, thereby determining the rotation angle and rotation state of the roller 10.

[0028] In some optional embodiments of this application, the roller assembly includes a roller 10; an impeller 20, the impeller 20 including a plurality of shielding portions 22 spaced apart along its circumference; an optical coupler 30, the impeller 20 being rotatably disposed at the optical coupler 30, the optical coupler 30 correspondingly cooperating with the plurality of shielding portions 22 of the impeller 20; a gear assembly 50, which is drivenly connected to the roller 10 and drivenly connected to the impeller 20 via a drive shaft 21; and a housing 40, in which the roller 10 is installed, the housing 40 having a first mounting hole 41, the drive shaft 21 being able to pass through the first mounting hole 41 along its axial direction.

[0029] In the roller assembly of this application embodiment, the drive shaft 21 includes a first shaft segment 211 and a second shaft segment 212. The diameter of the second shaft segment 212 is larger than the diameter of the first shaft segment 211. The first mounting hole 41 is a closed circular hole shape adapted to the outer peripheral surface of the second shaft segment 212. The second shaft segment 212 passes through the first mounting hole 41 along its axial direction.

[0030] In specific implementation, the drive shaft 21 includes a first shaft segment 211 with a smaller diameter and a second shaft segment 212 with a larger diameter. Since the first mounting hole 41 on the housing matches the outer circumferential shape of the second shaft segment 212, the second shaft segment 212 can be fitted into the first mounting hole 41. When installing the drive shaft 21, since the second shaft segment 212 is the part with the largest diameter of the entire drive shaft 21, the drive shaft 21 can be installed by passing through the first mounting hole 41 along its axial direction. After installation, the second shaft segment 212 is rotatably located in the closed first mounting hole 41, so that it rotates stably and does not have axial movement, thus ensuring the rotational accuracy of the drive shaft 21 and thus ensuring the adjustment accuracy of the roller 10.

[0031] Specifically, the drive shaft 21 is formed by the upper and lower molds of the mold. Since the drive shaft 21 is designed to include a first shaft segment 211 and a second shaft segment 212, the first shaft segment 211 and the second shaft segment 212 are connected along the axial direction of the drive shaft 21, and the diameters of the first shaft segment 211 and the second shaft segment 212 are different, there is a stepped surface between the first shaft segment 211 and the second shaft segment 212. This stepped surface can serve as a parting surface, so that the upper and lower molds of the mold can open the mold on this parting surface. Compared with the case where the mold is opened along the axis of the whole round shaft and the parting line extends along the axial direction, the mold opening with the stepped surface as the parting surface will not have a parting line. When the drive shaft 21 rotates in the first mounting hole 41, the influence of the parting line on the rotational stability is avoided.

[0032] like Figure 1 and Figure 2 As shown in the first embodiment of the present application, the roller assembly, wherein along the axial direction of the roller 10, the gear assembly 50 and the impeller 20 are respectively disposed on opposite sides of the roller 10, and the opposite side walls of the housing 40 are respectively provided with a first mounting hole 41 and a second mounting hole 42 through the roller. The second mounting hole 42 is a circular hole shape adapted to the outer peripheral surface of the first shaft segment 211, and the second mounting hole 42 has an opening.

[0033] In specific implementation, the gear assembly 50 and the impeller 20 are respectively located on opposite sides of the roller 10, rather than arranged sequentially in the same direction, which can reduce the space occupied by the roller assembly 100 in the axial direction of the roller 10; the first mounting hole 41 and the second mounting hole 42 are provided through both sides of the housing 40. The second mounting hole 42 is a round hole with an opening, so that when the first shaft segment 211 is installed into the second mounting hole 42, it can be directly engaged into the second mounting hole 42 from the opening. After the first shaft segment 211 is installed, the drive shaft 21 as a whole can move axially, so that the second shaft segment 212 enters the first mounting hole 41, thereby reducing the installation difficulty of the drive shaft 21.

[0034] In some optional embodiments of this application, along the axial direction of the roller 10, the gear assembly 50 and the impeller 20 are respectively disposed on opposite sides of the roller 10, and the housing 40 further includes a second mounting hole 42 disposed opposite to the first mounting hole 41, the second mounting hole 42 having an opening.

[0035] In some optional embodiments of this application, the housing 40 further includes a second mounting hole 42 disposed opposite to the first mounting hole 41. The second mounting hole 42 has a shape adapted to the outer peripheral surface of the first shaft segment 211 and has an opening.

[0036] like Figure 1 and Figure 2 As shown in the first embodiment of the roller assembly of this application, the drive shaft 21 further includes a limiting part 213 protruding from the outer peripheral surface of the first shaft segment 211. The limiting part 213 has an annular structure, and the outer diameter of the limiting part 213 is smaller than the diameter of the first mounting hole 41 and larger than the diameter of the second mounting hole 42.

[0037] In specific implementation, the limiting part 213 is arranged in a ring structure, and its outer diameter is smaller than the diameter of the first mounting hole 41. When the first shaft segment 211 is installed inside the second mounting hole 42, and the second shaft segment 212 is installed inside the first mounting hole 41, the limiting part 213 can ensure that when the drive shaft 21 is about to slide axially, the limiting part 213 will abut against the side wall of the housing 40 and cannot pass through the second mounting hole 42. Therefore, the limiting part 213 can play the role of axially limiting the drive shaft 21, avoiding excessive axial displacement of the drive shaft 21 during rotation, which would affect the transmission accuracy of the drive shaft 21. Moreover, the diameter of the limiting part 213 is also larger than the diameter of the second mounting hole 42, so that the limiting part 213 can pass through the second mounting hole 42 during the axial installation of the drive shaft 21 without affecting the installation of the drive shaft 21.

[0038] In some optional embodiments of this application, the outer diameter of the limiting portion 213 is larger than the diameter of the second mounting hole 42.

[0039] In the roller assembly of the second embodiment of this application, along the axial direction of the roller 10, the gear assembly 50 and the impeller 20 are respectively disposed on opposite sides of the roller 10, and the opposite side walls of the housing 40 are each provided with a through first mounting hole 41. The drive shaft 21 has two second shaft segments 212 disposed at intervals, and the two second shaft segments 212 are respectively rotatably disposed in the two first mounting holes 41.

[0040] In a specific implementation, in the roller assembly of the second embodiment of this application, the drive shaft 21 has two second shaft segments 212. The two second shaft segments 212 are located at both ends of the first shaft segment 211 and are rotatably disposed in the two first mounting holes 41. The two first mounting holes 41 can provide a support base for the two second shaft segments 212 and also provide two support points for the entire drive shaft 21, making the rotation of the drive shaft 21 more stable, thereby ensuring the rotational stability of the impeller 20 and thus ensuring the adjustment accuracy of the roller 10.

[0041] like Figure 1 and Figure 2 As shown in the embodiment of this application, the roller assembly includes a gear assembly 50 comprising a driving gear 51 and a driven gear assembly 52 meshing together. The driving gear 51 is coaxially arranged with the roller 10 and rotates in contact with it. The driven gear assembly 52 is drivenly connected to the impeller 20 via a drive shaft 21.

[0042] In specific implementation, the gear assembly 50 includes a driving gear 51 and a driven gear assembly 52. ​​The driving gear 51 is coaxially arranged and rotatably connected to the roller 10. This allows the roller 10 to rotate coaxially with the driving gear 51 without the need for teeth on the driving gear 51 to mesh with it. This ensures that the user will not come into contact with the teeth when rolling the roller 10, thus guaranteeing the feel of rolling the roller 10. Moreover, when the roller 10 and the driving gear 51 rotate coaxially, their rotation angles are the same. The driving gear 51 can reflect the rotation state of the roller 10, which facilitates precise adjustment of the roller 10.

[0043] like Figure 1 and Figure 2 As shown in the embodiment of this application, the roller assembly includes a driven gear assembly 52 comprising a first driven gear 521 and a second driven gear 522. The second driven gear 522 has the same diameter as the driving gear 51. The first driven gear 521 is meshed with both the driving gear 51 and the second driven gear 522. The diameters of the driving gear 51 and the second driven gear 522 are both smaller than the diameter of the first driven gear 521. The second driven gear 522 is coaxially arranged with the impeller 20 and rotatably connected to it via the drive shaft 21. The diameter of the second driven gear 522 is smaller than the diameter of the first mounting hole 41.

[0044] In specific implementation, the driving gear 51 is rotatably connected to the roller 10, and the second driven gear 522 is rotatably connected to the impeller 20. The first driven gear 521 is located between the driving gear 51 and the second driven gear 522 and meshes with them. The first driven gear 521 has a larger diameter, which can transmit the rotation of the driving gear 51 to the second driven gear 522, thereby realizing the transmission of rotation between the roller 10 and the impeller 20, which are a certain distance apart.

[0045] Since the driving gear 51 and the second driven gear 522 have the same diameter and both mesh with the first driven gear 521, the rotation angles of the driving gear 51 and the second driven gear 522 are always the same. The rotation state of the impeller 20, which is rotatably connected to the second driven gear 522, is completely consistent with the rotation state of the roller 10, which is rotatably connected to the driving gear 51. This allows the optocoupler 30 to stably reflect the rotation state of the roller 10, thereby ensuring the adjustment accuracy of the roller 10.

[0046] Optionally, the diameter of the second driven gear 522 can be smaller than the diameter of the driving gear 51. In this way, when the second driven gear 522 rotates the same distance as the driving gear 51, the second driven gear 522 rotates at a larger angle, resulting in a larger rotation angle of the impeller 20 relative to the roller 10. This can improve the detection accuracy of the optocoupler 30 for the rotation angle of the roller 10.

[0047] like Figure 1 and Figure 2 As shown in the embodiment of this application, the roller assembly is connected to the drive gear 51 and the roller 10 by a rotating shaft. The two ends of the rotating shaft are respectively connected to the rotation center of the drive gear 51 and the rotation center of the roller 10. The housing 40 also has a through-hole 43, and the rotating shaft is rotatably disposed in the rotating hole 43.

[0048] In specific implementation, the rotating shaft between the drive gear 51 and the roller 10 can be installed in the rotating hole 43 and rotate stably, so that the drive gear 51 can accurately reflect the rotation state of the roller 10, and then transmit the rotation state of the roller 10 to the driven gear assembly 52 and the impeller 20, so that the optocoupler 30 can read it accurately, thereby ensuring the adjustment accuracy of the roller 10.

[0049] like Figure 1 and Figure 2 As shown in the embodiment of this application, the roller assembly has a connecting shaft protruding towards the gear assembly 50 on the housing 40. The rotation center of the first driven gear 521 has a through connecting hole 523, and the first driven gear 521 is rotatably connected to the connecting shaft through the connecting hole 523.

[0050] In specific implementation, a connecting shaft is provided on the housing 40, and the connecting shaft is inserted into the connecting hole 523 of the first driven gear 521, so that the first driven gear 521 can rotate around the connecting shaft as the rotation center. The setting of the connecting shaft provides a mounting base for the first driven gear 521, enabling the first driven gear 521 to rotate stably and accurately transmit the rotation of the driving gear 51 to the second driven gear 522, thus ensuring the overall transmission stability of the roller assembly.

[0051] like Figure 1 and Figure 2 As shown in the figure, this application embodiment also provides a steering wheel, wherein the steering wheel includes the above-mentioned roller assembly 100, the steering wheel also includes a PCB board 200, and the optocoupler 30 is mounted on the surface of the PCB board 200 by SMT surface mount.

[0052] It should be noted that PCB (Printed Circuit Board) is a printed circuit board, and SMT (Surface Mount Technology) is a surface mount technology.

[0053] In practice, the PCB board 200 can supply power, perform calculations and adjust the movement of the roller assembly 100, thereby enabling the roller assembly 100 to precisely control the functions inside the vehicle; the optocoupler 30 is mounted on the surface of the PCB board 200 through SMT surface mount technology, and the connection between the optocoupler 30 and the PCB board 200 has high reliability and low solder joint defect rate.

[0054] This application also provides a vehicle, wherein the vehicle includes the steering wheel described above.

[0055] In a specific implementation, the vehicle in this embodiment includes a steering wheel, and a roller assembly 100 is provided inside the steering wheel. The user can adjust the intensity-adjustable functions within the vehicle using the roller assembly 100. The roller assembly includes a roller 10, an impeller 20, an optocoupler 30, a housing 40, and a gear assembly 50. The roller 10 is integrally installed inside the housing 40 and is drive-connected to the gear assembly 50. The gear assembly 50 is further drive-connected to the impeller 20 via a drive shaft 21. The drive shaft 21 includes a first shaft segment 211 with a smaller diameter and a second shaft segment 212 with a larger diameter. Because the first mounting hole 41 on the housing matches the outer circumferential shape of the second shaft segment 212, the second shaft segment 212 can be engaged with the first mounting hole 41 on the housing. When installing the drive shaft 21 in the first mounting hole 41, since the second shaft segment 212 is the largest diameter part of the entire drive shaft 21, the drive shaft 21 can be installed by passing through the first mounting hole 41 along its axial direction. After installation, the second shaft segment 212 is rotatably located in the closed first mounting hole 41, allowing it to rotate stably without axial movement, thus ensuring the rotational accuracy of the drive shaft 21. Since the impeller 20, which is driven and connected to the drive shaft 21, includes multiple blocking parts 22 spaced apart along its circumference, the rotation of the impeller 20 enables the optocoupler 30 to detect the blocking state of the blocking parts 22, allowing the optocoupler 30 to stably respond to the rotational state of the roller 10, thereby ensuring the adjustment accuracy of the roller 10.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A roller assembly, characterized in that, include: Roller; The impeller includes a plurality of shielding portions spaced apart along its circumference; An optical coupler, comprising a transmitter and a receiver, wherein an impeller is rotatably disposed between the transmitter and the receiver; A gear assembly is connected to the roller drive and is also connected to the impeller drive via a drive shaft; The housing has a first mounting hole in which the roller is mounted and the drive shaft is axially inserted.

2. The roller assembly according to claim 1, characterized in that, The first mounting hole has a closed shape that adapts to at least a portion of the outer peripheral surface of the drive shaft.

3. The roller assembly according to claim 1 or 2, characterized in that, The drive shaft includes a first shaft segment and a second shaft segment. The diameter of the second shaft segment is different from that of the first shaft segment, and the second shaft segment passes through the first mounting hole along its axial direction.

4. The roller assembly according to claim 3, characterized in that, The diameter of the second shaft segment is larger than the diameter of the first shaft segment.

5. The roller assembly according to claim 1 or 2, characterized in that, Along the axial direction of the roller, the gear assembly and the impeller are respectively disposed on opposite sides of the roller, and the housing further includes a second mounting hole disposed opposite to the first mounting hole, the second mounting hole having an opening.

6. The roller assembly according to claim 3, wherein the housing further comprises a second mounting hole disposed opposite to the first mounting hole, the second mounting hole having a shape adapted to the outer peripheral surface of the first shaft segment, and the second mounting hole having an opening.

7. The roller assembly according to claim 6, characterized in that, The drive shaft also includes a limiting part that protrudes from the outer peripheral surface of the first shaft segment. The limiting part has an annular structure, and the outer diameter of the limiting part is larger than the diameter of the second mounting hole.

8. The roller assembly according to claim 1 or 2, characterized in that, The gear assembly includes a driving gear and a driven gear assembly that are meshed together. The driving gear is coaxially arranged with the roller and rotates in contact with it. The driven gear assembly is driven to the impeller through the drive shaft.

9. The roller assembly according to claim 8, characterized in that, The driven gear assembly includes a first driven gear and a second driven gear. The first driven gear is meshed with both the driving gear and the second driven gear. The second driven gear is coaxially arranged with the impeller and rotatably connected to it through the drive shaft.

10. The roller assembly according to claim 9, characterized in that, The second driven gear has the same diameter as the driving gear, and the diameters of both the driving gear and the second driven gear are smaller than the diameter of the first driven gear.

11. The roller assembly according to claim 8, characterized in that, The drive gear and the roller are connected by a rotating shaft. The two ends of the rotating shaft are respectively connected to the rotation center of the drive gear and the rotation center of the roller. The housing also has a through-hole, and the rotating shaft is rotatably disposed in the rotating hole.

12. A steering wheel, characterized in that, The steering wheel includes a roller assembly as described in any one of claims 1 to 11, and the steering wheel further includes a PCB board, the optocoupler being mounted on the surface of the PCB board.

13. A vehicle, characterized in that, The vehicle includes the steering wheel as described in claim 12.

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