Wiper device

Abstract

Provided is a wiper device capable of fitting cleaning objects of various different shapes. A wiper main body (5) of a wiper device (100) is provided on a cleaning surface (220) of a cleaning object (200), and is provided with a rotating layer (3) and a stretchable layer (4). The rotating layer is provided with a motor (31) for outputting a rotational driving force for rotating the stretchable layer, the stretchable layer has a stretchable layer case (41), a compression spring (45), and a wiper arm (46), the base end of the compression spring is fixed to the stretchable layer case, and the compression spring constantly applies a force to the base end of the wiper arm so that the wiper arm can extend outward from an opening (42) of the stretchable layer case, and the wiper arm is provided so that the wiper arm can extend outward from the opening (42) of the stretchable layer case. The extension part of the wiper arm extending out of the opening (42) of the telescopic layer shell is attached to the cleaning face, the tail end (462) of the wiper arm makes contact with the edge part (211) of a shell (210) of a cleaning object all the time, and the extension length of the wiper arm changes along with rotation of the telescopic layer.

Description

wiper assembly Technical Field

[0001] This utility model relates to a windshield wiper device. Background Technology

[0002] In existing vehicles, windshield wipers are installed on the windshield to clean it. However, for objects exposed on the exterior of the vehicle, such as side mirrors and sensors, wipers are usually not installed. Instead, the cleaning method involves heating the surface of the object to evaporate rainwater and fog. This cleaning method cannot effectively remove rainwater or solid debris such as leaves and insects during heavy rain. Therefore, to ensure the driver's visibility and the proper functioning of sensors, there is a need to install wipers on the objects to be cleaned.

[0003] In this regard, Patent Document 1 discloses a wiper device for cleaning side mirrors. The device has a wiper arm with a rotation axis around one corner of the side mirror. The wiper arm is composed of a rigid part near the rotation axis and a flexible part away from the rotation axis. The wiper arm is used to scrape off foreign objects attached to the side mirror by rotating.

[0004] Existing technical documents

[0005] Patent document 1: Japanese Patent Application Publication No. 2008-105463.

[0006] Technical problem to be solved by the utility model

[0007] However, in Patent Document 1, since the shape and length of the rigid part of the wiper arm are fixed, such a wiper device requires the wiper arm to be designed according to the shape of the object being cleaned, making it difficult to adapt to objects with different shapes. Summary of the Invention

[0008] Therefore, this utility model was made in view of the above-mentioned technical problems, and one of its objectives is to provide a windshield wiper device that can adapt to cleaning objects of various shapes.

[0009] Technical means for solving technical problems

[0010] To achieve the above objectives, one aspect of this utility model is a windshield wiper device for cleaning the surface of an object in a vehicle. The wiper device includes a wiper body disposed on the surface of the object. The wiper body has a rotating layer and a telescopic layer stacked in a direction orthogonal to the surface of the object. A motor is disposed on the rotating layer, and the motor outputs a rotational driving force to rotate the telescopic layer. The telescopic layer has a telescopic layer housing, a compression spring, and a wiper arm. The base end of the compression spring is fixed to the telescopic layer housing, and the end end of the compression spring and the... The base end of the wiper arm is connected, and the compression spring and the wiper arm are spirally wound and housed in the telescopic layer housing with the compression spring on the upstream side and the wiper arm on the downstream side. The compression spring always applies force to the base end of the wiper arm, allowing the wiper arm to extend outward from the opening of the telescopic layer housing. The wiper arm is configured such that the protruding portion of the wiper arm extending from the opening of the telescopic layer housing is in contact with the cleaning surface, and the end of the wiper arm is always in contact with the edge of the housing of the object being cleaned. The extension length of the wiper arm changes with the rotation of the telescopic layer.

[0011] According to this structure, under the combined action of the elastic force of the compression spring and the pressure of the edge of the object being cleaned, the extension length of the wiper arm varies with the contour of the cleaning surface of the object being cleaned, thus enabling it to adapt to various shapes of objects being cleaned.

[0012] In one possible embodiment, the wiper assembly described above further includes: a base mounted on the housing of the object being cleaned; and a connecting rod, the two ends of which are respectively connected to the base and the wiper body.

[0013] According to this structure, the wiper body of the wiper unit can be reliably fixed relative to the cleaning surface of the object being cleaned via the base and connecting rod.

[0014] In one possible embodiment, in the wiper assembly described above, a roller is provided at the end of the wiper arm, and the roller makes rolling contact with the edge of the housing of the object being cleaned.

[0015] According to this structure, by setting a roller at the end of the wiper arm, the resistance when the wiper arm slides along the edge of the housing of the object being cleaned can be reduced, ensuring smooth rotation of the wiper arm and reducing the power consumption of the wiper unit.

[0016] In one possible embodiment, in the wiper assembly described above, the telescopic layer is driven to rotate in a single direction by the motor, and the extended portion of the wiper arm rotates circumferentially across the cleaning surface as the telescopic layer rotates.

[0017] According to this structure, since the telescopic layer only needs to rotate in one direction, the rotation control of the wiper unit can be simplified, and the wiper arm can rotate around the entire circumference of the cleaning surface, thus cleaning a wide range of the cleaning surface without any blind spots.

[0018] In one possible embodiment, in the aforementioned windshield wiper assembly, a wireless communication device is provided on the base, and the rotational speed of the telescopic layer is changed based on instructions received from the vehicle by the wireless communication device.

[0019] According to this structure, since wireless communication is used, there is no need to establish a communication connection between the wiper unit and the vehicle ECU through physical lines, which simplifies the installation process of the wiper unit.

[0020] In one possible embodiment, in the wiper assembly described above, at least the portion of the wiper arm that contacts the cleaning surface is made of rubber.

[0021] According to this structure, the flexible rubber forms a part of the wiper arm that fits into the cleaning surface of the object being cleaned, which can improve the fit between the wiper arm and the cleaning surface and ensure the cleaning power of the wiper unit.

[0022] In one possible embodiment, in the wiper assembly described above, the wiper arm has an arched cross-sectional shape when viewed along its length.

[0023] According to this structure, by setting the cross-sectional shape of the wiper arm to an arch shape, the stress intensity of the extended part of the wiper arm can be increased, so that the extended part of the wiper arm always maintains a straight shape during operation.

[0024] In one possible embodiment, in the above-described windshield wiper assembly, the wiper body is disposed at a corner of the vehicle body near the object to be cleaned.

[0025] According to this structure, by placing the wiper body near the corner of the vehicle body, the wiper unit can be made to not obstruct the driver's view.

[0026] In one possible embodiment, in the wiper device described above, the length of the wiper arm is set such that, in the state where the wiper arm extends the shortest length from the telescopic housing, the wiper arm is wound one to one and a half turns inside the telescopic layer.

[0027] According to this structure, by setting the wiper arm to a length range with fewer turns, the spring force of the compression spring is sufficient to allow the wiper arm to extend to the edge of the cleaning surface, thus ensuring smooth operation of the wiper unit.

[0028] In one possible embodiment, in the wiper assembly described above, a rain sensor is provided on the base, and the rotational speed of the telescopic layer is changed based on the amount of rain detected by the rain sensor.

[0029] According to this structure, by setting a rain sensor, the wiper unit can automatically control the wiper frequency according to the amount of rain, thereby improving the ease of operation of the wiper unit.

[0030] In one possible embodiment, in the wiper assembly described above, a track is further provided inside the telescopic housing, and the compression spring and the wiper arm are wound in a spiral manner along the track.

[0031] According to this structure, the smooth operation of the wiper unit can be ensured by guiding the compression spring and the curling of the wiper arm through the track.

[0032] In one possible embodiment, in the wiper device described above, a gear reducer is further provided in the rotating layer. The gear reducer includes a multi-stage gear that reduces the rotational driving force output from the motor and an output shaft that outputs the reduced rotational driving force. A coupling is further provided in the telescopic layer, and the output shaft engages with the coupling to transmit the rotational driving force to the telescopic layer.

[0033] Based on this structure, by using a gear reducer to slow down the speed of the motor, the wiper frequency of the wiper unit can be set within a suitable range.

[0034] Effects of the utility model

[0035] According to this utility model, a windshield wiper device that can adapt to cleaning objects of various shapes can be provided. Attached Figure Description

[0036] Figure 1 is a perspective view of a side mirror equipped with the windshield wiper device of this embodiment.

[0037] Figure 2 is a perspective view of the rotating layer of the wiper device in this embodiment.

[0038] Figure 3 is a perspective view of the telescopic layer of the wiper device in this embodiment.

[0039] Figure 4 is a schematic diagram showing the wiper arm of the wiper device of this embodiment extending out of the telescopic layer housing.

[0040] Figure 5 is a cross-sectional view of the wiper arm taken along line AA in Figure 4.

[0041] Figure 6 is a flowchart illustrating the working process of the windshield wiper unit.

[0042] Figure 7 corresponds to Figure 5 and shows a cross-sectional view of a wiper arm in a modified example.

[0043] Symbol Explanation

[0044] 100… Wiper assembly, 1… Base, 2… Connecting rod, 3… Rotating layer, 31… Motor, 32… Gear reducer, 33… Multi-stage gear, 34… Output shaft, 4… Telescopic layer, 41… Telescopic layer housing, 42… Opening, 43… Coupling, 44… Rail, 45… Compression spring, 46… Wiper arm, 46a… First part, 46b… Second part, 461… Base end, 462… End, 47… Roller, 5… Wiper body, 200… Side mirror, 210… Housing, 211… Edge, 220… Mirror surface. Detailed Implementation

[0045] The following describes specific embodiments of this utility model. The specific embodiments described below are merely illustrative of the structures that can be adopted by this utility model and are not intended to limit it. It should be understood that the directional terms such as "front / rear," "up / down," and / or "left / right" used in this utility model are defined based on the drawing directions in the corresponding accompanying drawings for ease of explanation and are not intended to limit position or spatial orientation.

[0046] The structure of the windshield wiper assembly 100 of this embodiment will be described with reference to the accompanying drawings. FIG1 is a perspective view of a side mirror 200 on which the windshield wiper assembly 100 is provided.

[0047] As shown in Figure 1, the side mirror 200 of a vehicle has a housing 210 and a mirror surface 220, with the edge portion 211 of the housing 210 that contacts the mirror surface 220. In this embodiment, the windshield wiper device 100 cleans the side mirror 200, using the mirror surface 220 as the cleaning surface. The windshield wiper device 100 is positioned at a corner of the side mirror 200, for example, near a corner of the vehicle body, thereby minimizing obstruction of the driver's view.

[0048] Additionally, as shown in Figure 1, the wiper assembly 100 includes a base 1, a connecting rod 2, and a wiper body 5. The base 1 is mounted on the housing 210 of the side mirror 200. The two ends of the connecting rod 2 are connected to the base 1 and the wiper body 5, respectively. Using the base 1 and the connecting rod 2, the wiper body 5 is reliably fixed relative to the mirror surface 220 of the side mirror 200. The wiper body 5 includes a rotating layer 3 and a telescopic layer 4, which are stacked in a direction orthogonal to the mirror surface 220.

[0049] Referring to Figures 2 and 3, the internal structure of the wiper body 5 will be described. Figure 2 is a perspective view of the rotating layer 3 of the wiper assembly 100, showing the state where the outer shell of the rotating layer 3 is omitted. Figure 3 is a perspective view of the telescopic layer 4 of the wiper assembly 100.

[0050] As shown in Figure 2, a motor 31 is installed in the rotating layer 3, which outputs a rotational driving force to rotate the telescopic layer 4 (described later). A gear reducer 32 is also installed in the rotating layer 3. The gear reducer 32 includes a multi-stage gear 33 and an output shaft 34. The multi-stage gear 33 reduces the rotational driving force output from the motor 31, and the output shaft 34 outputs the reduced rotational driving force to the telescopic layer 4. Therefore, the wiper frequency of the wiper unit 100 (i.e., the rotational speed of the telescopic layer 4) can be set within a suitable range.

[0051] As shown in Figure 3, a coupling portion 43 is provided in the telescopic layer 4, and the output shaft 34 of the rotating layer 3 is fitted into the coupling portion 43, thereby transmitting the rotational driving force of the motor 31 to the telescopic layer 4. The telescopic layer 4 also includes a telescopic layer housing 41, a track 44, a compression spring 45, and a wiper arm 46. The telescopic layer housing 41 is, for example, a flat hollow cylinder shape with an open top, allowing the output shaft 34 of the rotating layer 3 to be inserted into the coupling portion 43 from above. Alternatively, the telescopic layer housing 41 may also be a hollow cylinder with a cover on top, with a hole in the cover for the output shaft 34 to be inserted. The track 44 extends spirally from the coupling portion 43 to an opening 42 on the outer circumferential surface of the telescopic layer housing 41. The compression spring 45 and the wiper arm 46 are housed inside the telescopic layer housing 41. Specifically, the base end of the compression spring 45 is fixed to the telescopic layer housing 41, and the end of the compression spring 45 is connected to the base end 461 of the wiper arm 46. The connection method between the end of the compression spring 45 and the base end 461 of the wiper arm 46 is not particularly limited. It can be bonded with adhesive, or a portion of the compression spring 45 can be embedded in the wiper arm 46. Furthermore, the compression spring 45 and the wiper arm 46 are spirally wound sequentially along the track 44 with the compression spring 45 on the upstream side and the wiper arm 46 on the downstream side, thereby housing the compression spring 45 and the wiper arm 46 in the telescopic layer housing 41.

[0052] Furthermore, the length of the wiper arm 46 is set such that, with the extended portion of the wiper arm 46 extending from the opening 42 of the telescopic housing 41 at its shortest length, the wiper arm 46 winds around the telescopic housing 41 one to one and a half times. By setting the wiper arm 46 to a length range with fewer winding turns, it is ensured that the spring force of the compression spring 45 is sufficient to allow the end 462 of the wiper arm 46 to extend to the edge 211 of the housing 210 of the side mirror 200, thus ensuring smooth operation of the wiper unit 100.

[0053] The wiper arm 46 will be further described below with reference to Figures 4 and 5. Figure 4 is a schematic diagram of the wiper assembly 100 with the wiper arm 46 extended from the telescopic housing 41. Figure 5 is a cross-sectional view of the wiper arm 46 taken along line AA in Figure 4. As shown in Figures 3 and 4, the wiper arm 46 is able to extend outward from the opening 42 of the telescopic housing 41 because the compression spring 45 always applies force to the base end 461 of the wiper arm 46. The extended portion of the wiper arm 46 extending from the opening 42 of the telescopic housing 41 is in contact with the mirror surface 220 of the side mirror 200. A roller 47 is provided at the end 462 of the wiper arm 46. With the force applied to the wiper arm 46 by the compression spring 45, the end 462 of the wiper arm 46 is in constant rolling contact with the edge 211 of the housing 210 via the roller 47.

[0054] When the wiper unit 100 is not in operation, due to the elastic force of the compression spring 45, the end 462 of the wiper arm 46 abuts against the edge 211 of the housing 210 via the roller 47. At this time, the wiper arm 46 stops at the position where its extension length from the telescopic housing 41 is the shortest. That is, when the wiper unit 100 is not in operation, the distance between the opening 42 and the edge 211 of the telescopic housing 41 is the shortest.

[0055] When the wiper unit 100 is in operation, the telescopic layer 4 is driven by the motor 31 in a single direction (either clockwise or counterclockwise). The wiper arm 46 is constantly subjected to the elastic force of the compression spring 45 and the pressure of the edge portion 211. The extended portion of the wiper arm 46 rotates as the telescopic layer 4 rotates. Due to the combined effect of the elastic force of the compression spring 45 and the pressure of the edge portion 211 of the housing 210, the extended length of the wiper arm 46 gradually increases as the telescopic layer 4 rotates. Since the telescopic layer 4 only needs to rotate in one direction, the rotation control of the wiper unit 100 can be simplified. In addition, since the end 462 of the wiper arm is always in contact with the edge portion 211 via the roller 47, the extended portion of the wiper arm 46 rotates around the entire circumference of the mirror surface 220. Therefore, the mirror surface 220 can be cleaned over a wide area without any blind spots.

[0056] At this time, the roller 47 rolls on the edge portion 211, thereby reducing the resistance when the wiper arm 46 moves along the edge portion 211, ensuring smooth rotation of the wiper arm, and reducing the power consumption of the wiper device 100.

[0057] According to this structure, under the combined action of the elastic force of the compression spring 45 and the pressure of the edge portion 211 of the housing 210 of the side mirror 200, the extension length of the wiper arm 46 varies with the contour of the mirror surface 220 of the side mirror 200, which is the object to be cleaned, so that it can be adapted to various cleaning objects of different shapes.

[0058] The wiper arm 46 is made of rubber, and the flexible rubber forms the part of the wiper arm 46 that fits against the mirror surface 220, which improves the fit between the wiper arm 46 and the mirror surface 220 and ensures the cleaning power of the wiper assembly 100. When viewed along the length of the wiper arm 46, as shown in Figure 5, the cross-sectional shape of the wiper arm 46 is arched. By setting the cross-sectional shape of the wiper arm 46 to an arched shape, the stress strength of the part of the wiper arm 46 extending from the opening 42 can be increased, so that the extended part of the wiper arm 46 always maintains a straight shape during operation.

[0059] The windshield wiper unit 100 may also have a wireless communication device. Although not shown, the wireless communication device may, for example, be mounted on the base 1. The wireless communication device is used to receive commands from the vehicle, such as windshield wiper operation commands manually issued by the driver. Therefore, a physical wiring connection between the windshield wiper unit 100 and the vehicle ECU is not required, simplifying the installation process of the windshield wiper unit 100.

[0060] The wiper assembly 100 also includes a rain sensor, which, although not shown, can be mounted on the base 1 or the wiper body 5. The rain sensor is used to detect rainfall near the side mirror 200.

[0061] Figure 6 is a flowchart illustrating the operation of the windshield wiper unit 100. The operation of the windshield wiper unit 100 will be described with reference to Figure 6. In the operation shown in Figure 6, the windshield wiper unit 100 receives a windshield wiper operation command manually issued by the driver via a wireless communication device, and detects the amount of rainfall via its own rain sensor.

[0062] In step S1, the wiper unit 100 determines whether there is a wiper operation command. If the command is "yes" in step S1, proceed to step S2. In step S2, the wiper unit 100 changes the rotation speed (i.e., wiper frequency) of the telescopic layer 4 based on the wiper speed setting indicated in the command. If the command is "no", proceed to step S3. In step S3, the wiper unit 100 determines whether the rain sensor has detected rain, i.e., whether the rain amount detected by the rain sensor is not zero. If the detected rain amount is not zero, i.e., if the command is "yes" in step S3, proceed to step S4. In step S4, the wiper unit 100 automatically changes the rotation speed of the telescopic layer 4 based on the detected rain amount. If the detected rain amount is zero, i.e., if the command is "no" in step S3, proceed to step S5. In step S5, the wiper unit 100 does not operate, and the telescopic layer 4 stops at the position where the wiper arm 46 has its shortest extension length.

[0063] According to the above workflow, the wiper unit 100 can be manually controlled to activate and adjust the wiping frequency based on user commands, or it can automatically adjust the wiping frequency based on the detected rainfall. Especially when the wiping frequency is automatically adjusted, the ease of operation of the wiper unit 100 can be further improved.

[0064] <Variation Example>

[0065] The embodiments of this utility model have been described above, but this utility model is not limited to these examples. Those skilled in the art can appropriately add, remove, or modify the constituent elements of the above embodiments, or appropriately combine some features of the embodiments, as long as they do not violate the spirit of this utility model, and such modifications are included within the scope of this utility model.

[0066] In the above embodiments, an example of the wiper device 100 cleaning the side mirror 200 of a vehicle was described, but the cleaning object is not limited to this. For example, various sensors of the vehicle exposed outside the body can also be used as cleaning objects, in which case the cleaning surface cleaned by the wiper device 100 can be the sensor probe surface. The wiper device 100 of this invention can adapt to cleaning objects of various shapes.

[0067] In the above embodiment, an example of fixing the wiper assembly 100 by the base 1 and the connecting rod 2 was described, but the fixing method of the wiper assembly 100 is not limited to this. For example, the base 1 can be omitted and only the connecting rod 2 can be provided, and the wiper body 5 can be integrally set to the object to be cleaned by the connecting rod 2. Alternatively, the base 1 and the connecting rod 2 can be omitted, and an adsorption part that can rotate relative to the telescopic layer 4 can be provided, and the wiper body 5 can be fixed relative to the cleaning surface of the object to be cleaned by adsorption force.

[0068] In the above embodiment, an example was described in which a gear reducer 32 is provided in the rotating layer 3 and a coupling part 43 is provided in the telescopic layer 4. However, the gear reducer and coupling part may not be provided, or other known transmission structures may be used. As long as the rotational driving force of the motor 31 can be transmitted to the telescopic layer 4 and the rotational speed of the telescopic layer 4 can be controlled within an appropriate range, it is acceptable.

[0069] In the above embodiment, an example was described where the wiper assembly 100 has a track 44 provided in the telescopic layer 4. The track 44 guides the compression spring 45 and the windshield wiper arm 46, ensuring smooth operation of the wiper assembly 100. However, the track 44 can be omitted as long as the wiper arm 46 can extend and retract smoothly during rotation.

[0070] In the above embodiment, an example was described in which a roller 47 is provided at the end 462 of the wiper arm 46 of the wiper device 100. The roller 47 ensures smooth rotation of the wiper arm 46 and reduces the power consumption of the wiper device 100. However, as long as the wiper arm 46 can rotate along the edge 211 of the housing 210 during the operation of the wiper device 100, the roller 47 can be omitted.

[0071] In the above embodiment, an example was described where the wiper arm 46 was entirely made of rubber, but the material of the wiper arm 46 is not limited to this. For example, as shown in FIG7, when viewed along the length of the wiper arm 46, the cross-section of the wiper arm 46 may have a first portion 46a near the mirror surface 220 and a second portion 46b away from the mirror surface 220. The first portion 46a is made of rubber, and the second portion 46b is made of other materials such as metal. In short, as long as at least the portion of the wiper arm 46 that is in contact with the mirror surface 220 is made of rubber, the material of the other portions is not particularly limited.

[0072] In the above embodiments, an example was described where the windshield wiper assembly 100 includes a wireless communication device and a rain sensor. However, either or both of the wireless communication device and the rain sensor may be omitted.

Claims

1. A windshield wiper assembly for cleaning the surface of an object to be cleaned in a vehicle, characterized in that, The windshield wiper assembly includes a wiper body disposed on the cleaning surface of the object being cleaned. The wiper body has a rotating layer and a telescopic layer stacked in a direction orthogonal to the cleaning surface. A motor is disposed on the rotating layer, and the motor outputs a rotational driving force to rotate the telescopic layer. The telescopic layer has a telescopic layer housing, a compression spring, and a wiper arm. The base end of the compression spring is fixed to the telescopic layer housing, and the end end of the compression spring is connected to the base end of the wiper arm. The compression spring and the wiper arm are connected by a... The compression spring is spirally wound into the telescopic housing with the wiper arm located upstream and the wiper arm located downstream. The compression spring always applies force to the base end of the wiper arm, allowing the wiper arm to extend outward from the opening of the telescopic housing. The wiper arm is configured such that the extended portion of the wiper arm extending from the opening of the telescopic housing is in contact with the cleaning surface, and the end of the wiper arm is always in contact with the edge of the housing of the object being cleaned. The extension length of the wiper arm changes as the telescopic layer rotates.

2. The wiper device according to claim 1, characterized in that, It also includes: a base, which is mounted on the housing of the object being cleaned; and a connecting rod, the two ends of which are respectively connected to the base and the wiper body.

3. The wiper device according to claim 1, characterized in that, A roller is provided at the end of the wiper arm, and the roller makes rolling contact with the edge of the housing of the object being cleaned.

4. The wiper device according to claim 1, characterized in that, The telescopic layer is driven to rotate in one direction by the motor, and the extended portion of the wiper arm rotates around the entire circumference of the cleaning surface as the telescopic layer rotates.

5. The wiper assembly according to claim 2, characterized in that, A wireless communication device is provided on the base, and the rotational speed of the telescopic layer is changed based on instructions received from the vehicle by the wireless communication device.

6. The wiper assembly according to claim 1, characterized in that, At least the portion of the wiper arm that contacts the cleaning surface is made of rubber.

7. The wiper assembly according to claim 1, characterized in that, When viewed along the length of the wiper arm, the cross-sectional shape of the wiper arm is arched.

8. The wiper assembly according to claim 1, characterized in that, The wiper body is located at the corner of the vehicle body near the object being cleaned.

9. The wiper assembly according to claim 1, characterized in that, The length of the wiper arm is set such that, in the state where the wiper arm extends the shortest length from the telescopic layer housing, the wiper arm is wound one to one and a half turns inside the telescopic layer.

10. The wiper assembly according to claim 2, characterized in that, A rain sensor is provided on the base, and the rotational speed of the telescopic layer changes based on the amount of rainfall detected by the rain sensor.

11. The wiper assembly according to claim 1, characterized in that, A track is also provided inside the telescopic layer housing, along which the compression spring and the wiper arm are wound in a spiral shape.

12. The wiper assembly according to any one of claims 1-11, characterized in that, The rotating layer is also provided with a gear reducer, which includes a multi-stage gear that reduces the rotational driving force output from the motor and an output shaft that outputs the reduced rotational driving force. The telescopic layer is also provided with a coupling part, and the output shaft is engaged with the coupling part to transmit the rotational driving force to the telescopic layer.

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