Windshield wiper with variable length

Abstract

The utility model relates to a windshield wiper with variable length, which comprises a first windshield wiper arm, a second windshield wiper arm, a second windshield wiper arm, a third windshield wiper arm and a fourth windshield wiper arm, the second windshield wiper arm can be arranged in the first containing groove in a sliding mode and is provided with a second windshield wiper blade and a second containing groove; the rolling wheel can rotate in the first rotating direction or the second rotating direction while making contact with the surface of the windshield; the transmission assembly can enable the second windshield wiper arm to slide when the roller rotates; the control assembly can control the transmission assembly so that the second windshield wiper arm can slide in the first sliding direction or the second sliding direction, and therefore the overall working length of the windshield wiper can be increased or decreased. According to the wiper with the variable length, the working length can be adjusted in real time, so that the cost can be saved, a new wiping blind area cannot be generated while the wiping range is enlarged, and the wiper has better practicability.

Description

Technical Field

[0001] This utility model relates to the field of vehicles, and more particularly to a windshield wiper with variable length. Background Technology

[0002] Windshield wipers are an important accessory installed on a vehicle's windshield. Their function is to wipe away rain, snow, dust, and other debris adhering to the windshield to improve the driver's visibility and thus enhance driving safety.

[0003] Traditional windshield wipers are typically of a fixed length, meaning the wiping range of the wiper blades is not adjustable during operation. For taller drivers, the limited wiping height may prevent the wiper blades from completely clearing the windshield directly in front of them, impairing their visibility and creating a safety hazard.

[0004] Telescopic wipers can address these issues to some extent, as exemplified by the Chinese patent application entitled "A Telescopic Wiper Extension Arm" (Grant No.: CN 209351363 U). However, this type of wiper, which adjusts the length of the extension arm via an additional motor without altering the working length of the wiper blade, not only creates new blind spots but also increases costs. A telescopic multi-angle car wiper (Grant No.: CN216331911 U) adjusts the wiping range by changing the working length of the wiper blade; however, this wiper requires manual adjustment by the driver before use, resulting in poor practicality, and the altered blade length also creates new blind spots.

[0005] The information disclosed in the background section of this utility model is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the present invention aims to provide a windshield wiper with variable length, which can adjust the working length in real time by using the cooperation of rollers, transmission components and control components during operation. This not only saves costs, but also increases the wiping range without creating new wiping blind spots, thus having better practicality.

[0007] This utility model provides a variable-length windshield wiper, comprising: a first wiper arm rotatably mounted to a vehicle, the first wiper arm having a first wiper blade and a first receiving groove; a second wiper arm slidably disposed in the first receiving groove, the second wiper arm having a second wiper blade and a second receiving groove; a roller disposed in the first wiper arm and configured such that when the first wiper arm rotates to wipe the windshield, the roller can rotate along a first rotation direction or a second rotation direction while in contact with the windshield surface; a transmission assembly disposed in the first receiving groove and at least partially located in the second receiving groove, the transmission assembly being connected to the roller, and when the roller rotates, the transmission assembly enabling the second wiper arm to slide along the first receiving groove; and a control assembly disposed in the transmission assembly and capable of controlling the transmission assembly to cause the second wiper arm to slide in the first sliding direction or the second sliding direction, thereby increasing or decreasing the overall working length of the wiper.

[0008] According to an exemplary embodiment of the present invention, the inner sidewall of the second wiper arm is provided with a rack extending along its length. The transmission assembly includes: a rotating shaft coaxially connected to the roller and provided with a first worm portion and a second worm portion whose helical teeth rotate in the opposite direction to those of the first worm portion; a connecting rod rotatably connected to the first wiper arm; a first conversion worm gear disposed at one end of the connecting rod and capable of meshing with the first worm portion; a second conversion worm gear disposed at the other end of the connecting rod and capable of meshing with the second worm portion; a first transmission gear fixedly connected to the first conversion worm gear and coaxial with the first conversion worm gear; and a second transmission gear fixedly connected to the second conversion worm gear and coaxial with the first conversion worm gear. The second conversion worm gear is coaxial; wherein the control component can control the connecting rod to swing, such that the first conversion worm gear meshes with the first worm portion and simultaneously causes the first transmission gear to mesh with the rack, thereby causing the second wiper arm to slide towards the first sliding direction when the roller rotates along the first rotation direction, and the second wiper arm to slide towards the second sliding direction when the roller rotates along the second rotation direction; or causing the second conversion worm gear to mesh with the second worm portion and simultaneously cause the second transmission gear to mesh with the rack, thereby causing the second wiper arm to slide towards the second sliding direction when the roller rotates along the first rotation direction, and the second wiper arm to slide towards the first sliding direction when the roller rotates along the second rotation direction.

[0009] According to an exemplary embodiment of the present invention, the control component includes: a cam drive wheel, coaxially connected to the rotating shaft and capable of rotating with the rotating shaft, the cam drive wheel being located between the first worm portion and the second worm portion; and a cam, which contacts the cam drive wheel and is provided with a first small radius portion and a second small radius portion extending radially outward, and a first large radius portion and a second large radius portion are respectively provided between the first small radius portion and the second small radius portion; wherein, the rotation of the cam drive wheel can drive the cam to rotate, and when the first small radius portion or the second small radius portion contacts the cam drive wheel, the connecting rod swings along a first swing direction, so that the first conversion worm gear meshes with the first worm portion and simultaneously causes the first transmission gear to mesh with the rack; when the first large radius portion or the second large radius portion contacts the cam drive wheel, the connecting rod swings along a second swing direction, so that the second conversion worm gear meshes with the second worm portion and simultaneously causes the second transmission gear to mesh with the rack.

[0010] According to an exemplary embodiment of the present invention, the inner sidewall of the first wiper arm is provided with a guide rail extending along the length direction, and the outer sidewall of the second wiper arm is provided with a groove corresponding to the guide rail. The groove can slide along the guide rail to guide the second wiper arm to slide in a first sliding direction or a second sliding direction.

[0011] According to an exemplary embodiment of the present invention, a bracket is provided on the inner sidewall of the first wiper arm. The bracket includes: a bracket body; a first extension portion, which is U-shaped and its middle portion is connected to one end of the bracket body, and the two ends of the first extension portion are respectively provided with two first shaft holes corresponding to the rotating shaft; a second extension portion, which is connected to the bracket body near the middle portion and is provided with a second shaft hole corresponding to the rotating shaft; and a third extension portion, which is connected to the other end of the bracket body and is provided with a third shaft hole corresponding to the rotating shaft; wherein the rotating shaft is rotatably inserted into the first shaft hole, the second shaft hole and the third shaft hole, and the roller is mounted between the two first shaft holes through the rotating shaft.

[0012] According to an exemplary embodiment of the present invention, a connecting hole is provided in the middle of the connecting rod; a connecting shaft is provided in the middle of the second extension, and the connecting shaft is inserted into the connecting hole so that the connecting rod can be oscillatingly connected to the first wiper arm.

[0013] According to an exemplary embodiment of the present invention, the variable-length wiper further includes: an elastic member, the elastic member being mounted to the bracket and abutting against the connecting rod, the elastic member being located near the second extension between the first extension and the second extension.

[0014] According to an exemplary embodiment of the present invention, the bracket is further provided with a mounting groove; the elastic member is configured as a spring sheet, and one end of the elastic member is inserted into the mounting groove, while the other end of the elastic member abuts against the side wall of the connecting rod.

[0015] According to an exemplary embodiment of the present invention, the sidewalls of the first wiper arm and the second wiper arm are respectively provided with slots extending along the length direction; the first wiper blade and the second wiper blade are respectively provided with a snap-fit ​​portion corresponding to the slot, the snap-fit ​​portion being inserted into the slot so that the first wiper blade is installed to the first wiper arm and the second wiper blade is installed to the second wiper arm.

[0016] According to an exemplary embodiment of the present invention, a strip-shaped hole extending along the length direction is provided in the middle of the third extension, the connecting rod passes through the strip-shaped hole and is able to move in the strip-shaped hole.

[0017] The variable-length windshield wiper of this invention slides the second wiper arm onto the first wiper arm, and during operation, the overall working length of the wiper is adjusted in real time by the cooperation of rollers, transmission components and control components. This not only saves costs, but also increases the wiping range without creating new blind spots, thus having better practicality.

[0018] The device of this invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and subsequent embodiments incorporated herein, which together serve to explain the particular principles of this invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a windshield wiper with variable length according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram showing the cooperation between the first wiper arm and the first wiper blade of a wiper with variable length according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram showing the cooperation between the second wiper arm and the second wiper blade of a wiper with variable length according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram showing the cooperation between the first wiper arm and the second wiper arm of a windshield wiper with variable length according to an embodiment of the present invention.

[0023] Figure 5 for Figure 4 A partial structural diagram.

[0024] Figure 6 This is a partial structural diagram of a windshield wiper with variable length according to an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of another part of the structure of the variable-length windshield wiper according to an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram showing the interaction between the drive assembly, roller, and control accessories of a windshield wiper with variable length according to an embodiment of the present invention.

[0027] Figure 9 This is a structural diagram of the bracket for a windshield wiper with variable length according to an embodiment of the present invention.

[0028] Figure 10 This is a schematic diagram of a variable-length windshield wiper operating on a windshield according to an embodiment of the present invention.

[0029] Figure 11 This is a schematic diagram showing the interaction of some structural components of the variable-length windshield wiper when its working direction on the windshield is L, according to an embodiment of this utility model.

[0030] Figures 12A to 12D This is a schematic diagram showing the interaction of some structural components of the windshield wiper during the process of completing one wipe in the working direction L, according to the embodiment of this utility model.

[0031] Figures 13A to 13D This is a schematic diagram illustrating the action of the control components during one wiping cycle in the working direction L of a windshield wiper according to an embodiment of the present invention. Figure 13A For along Figure 12A Obtained from the BB line in the middle. Figure 13B For along Figure 12B Obtained from the BB line in the middle. Figure 13C For along Figure 12C Obtained from the BB line in the middle. Figure 13D For along Figure 12D Obtained from the BB line.

[0032] Figures 14A to 14D This is a schematic diagram showing the sliding of the second wiper arm during the process of a wiper with variable length completing one wipe in the working direction L, according to an embodiment of the present invention.

[0033] Figure 15 This is a schematic diagram showing the interaction of some structural components of the variable-length windshield wiper when its working direction on the windshield is R, according to an embodiment of this utility model.

[0034] Figure 16 This is a schematic diagram showing the interaction between the roller of the variable-length windshield wiper and the windshield in an embodiment of this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100: First wiper arm

[0037] 110: First wiper blade; 111: Connecting part

[0038] 120: First receiving slot; 130: Card slot

[0039] 140: Guide rail; 101: Connecting component

[0040] 102: Support bracket; 150: Support bracket body

[0041] 160: First extension; 161: First shaft hole

[0042] 170: Second extension; 171: Second shaft hole

[0043] 172: Connecting shaft; 180: Third extension.

[0044] 181: Third shaft hole; 182: Strip hole

[0045] 190: Mounting slot

[0046] 200: Second wiper arm

[0047] 210: Second wiper blade; 220: Second receiving groove

[0048] 230: Rack and pinion; 240: Slide.

[0049] 300: Roller

[0050] 310: Protrusion

[0051] 400: Transmission assembly

[0052] 410: Rotating shaft; 411: First worm gear section

[0053] 412: Second worm gear section; 420: Connecting rod

[0054] 421: Connecting hole; 430: First conversion worm gear

[0055] 440: Second conversion worm gear; 450: First transmission gear

[0056] 460: Second transmission gear

[0057] 500: Control Component

[0058] 510: Cam drive wheel 520: Cam

[0059] 521: First small radius portion; 522: Second small radius portion

[0060] 523: First largest radius portion; 524: Second largest radius portion

[0061] 600: Elastic member

[0062] 700: Windshield.

[0063] It should be understood that the accompanying drawings are not necessarily drawn to scale, but rather present simplified representations of various features to illustrate the basic principles of this invention. The specific design features disclosed in this invention (including, for example, specific dimensions, orientations, positions, and shapes) will be determined in part by the specific application and environment in which they will be used.

[0064] Throughout these figures, the same reference numerals denote the same or equivalent parts of the present invention. Detailed Implementation

[0065] The present invention will now be described in detail with reference to various embodiments, examples of which are presented in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the present invention to these exemplary embodiments. Rather, the present invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments that may be included within the spirit of the present invention and the scope defined by the appended claims.

[0066] The following is combined Figures 1 to 16 The variable length windshield wiper of the present invention will be described.

[0067] Figure 1 This is a schematic diagram of the overall structure of a windshield wiper with variable length according to an embodiment of the present invention.

[0068] First, it should be noted that the variable-length windshield wiper of this utility model is applied to the windshield 700 of a vehicle (in conjunction with...). Figure 10 (As shown).

[0069] like Figure 1 As shown, the variable-length windshield wiper of this utility model embodiment includes: a first wiper arm 100, a second wiper arm 200, a roller 300, a transmission assembly 400, and a control assembly 500.

[0070] The first wiper arm 100 is rotatably mounted to the vehicle. Specifically, in an exemplary embodiment of this utility model, it is used in conjunction with... Figure 10As shown, the first wiper arm 100 is provided with a connecting member 101. The connecting member 101 is located at the end of the first wiper arm 100 and positioned at the center below the windshield 700. The connecting member 101 can be connected to a wiper motor to control the rotation of the first wiper arm 100. Furthermore, in conjunction with... Figure 2 As shown, the first wiper arm 100 is provided with a first wiper blade 110 and a first receiving groove 120. The first wiper blade 110 is mounted to the side wall of the first wiper arm 100 for wiping rain, snow or dust on the windshield 700. The opening of the first receiving groove 120 faces the windshield 700.

[0071] The second wiper arm 200 is slidably disposed in the first receiving groove 120 and is provided with a second wiper blade 210 and a second receiving groove 220. The second wiper blade 210 is mounted to the side wall of the second wiper arm 200 and works together with the first wiper blade 110 to wipe rain, snow or dust off the windshield. The opening of the second receiving groove 220 faces the windshield 700.

[0072] Specifically, in an exemplary embodiment of this utility model, in conjunction with Figures 2 to 4 As shown, the side walls of the first wiper arm 100 and the second wiper arm 200 are respectively provided with slots 130 extending along the length direction. The first wiper blade 110 and the second wiper blade 210 are respectively provided with engaging portions 111 corresponding to the slots 130. The engaging portions 111 are inserted into the slots 130 so that the first wiper blade 110 is installed to the first wiper arm 100 and the second wiper blade 210 is installed to the second wiper arm 200.

[0073] The roller 300 is disposed on the first wiper arm 100 and configured such that when the first wiper arm 100 rotates to wipe the windshield 700, the roller 300 can contact the surface of the windshield 700 while rotating along a first rotation direction or a second rotation direction. Specifically, in conjunction with Figure 16 As shown, at least a portion of the roller 300 can protrude from the opening of the first receiving groove 120 to contact the windshield 700, and the roller 300 is provided with a radially outwardly extending protrusion 310. The protrusion 310 contacts the surface of the windshield 700, increasing the frictional force during contact, thereby facilitating the rolling of the roller 300 and ensuring the stability and reliability of the wiper of this invention. The first rotation direction refers to... Figure 11 The direction shown in T1, the second rotation direction refers to Figure 15 The direction indicated by T2.

[0074] A transmission assembly 400 is disposed in the first receiving groove 120 and at least a portion thereof is located in the second receiving groove 220. The transmission assembly 400 is connected to the roller 300, and when the roller 300 rotates, the transmission assembly 400 enables the second wiper arm 200 to slide along the first receiving groove 120. A control assembly 500 is disposed in the transmission assembly 400 and is capable of controlling the transmission assembly 400 to cause the second wiper arm 200 to slide in a first sliding direction or a second sliding direction, thereby increasing or decreasing the overall working length of the wiper.

[0075] Specifically, in an exemplary embodiment of this utility model, in conjunction with Figure 4 and Figures 14A to 14D As shown, the inner sidewall of the second receiving groove 220 of the second wiper arm 200 is provided with a rack 230 extending along the length direction. (Matching...) Figures 6 to 8 As shown, the transmission assembly 400 includes a rotating shaft 410, a connecting rod 420, a first conversion worm gear 430, a second conversion worm gear 440, a first transmission gear 450, and a second transmission gear 460. The rotating shaft 410 is coaxially connected to the roller 300 and is provided with a first worm portion 411 and a second worm portion 412 whose helical teeth rotate in the opposite direction to those of the first worm portion 411. The connecting rod 420 is rotatably connected to the first wiper arm 100 (in cooperation with the first wiper arm 100). Figure 1 and Figure 11 (As shown). A first conversion worm gear 430 is disposed at one end of the connecting rod 420 and can mesh with the first worm portion 411. A second conversion worm gear 440 is disposed at the other end of the connecting rod 420 and can mesh with the second worm portion 412. A first transmission gear 450 is fixedly connected to the first conversion worm gear 430 and is coaxial with the first conversion worm gear 430. A second transmission gear 460 is fixedly connected to the second conversion worm gear 440 and is coaxial with the second conversion worm gear 440. The control component 500 can control the connecting rod 420 to swing, so that the first conversion worm gear 430 meshes with the first worm portion 411 and simultaneously the first transmission gear 450 meshes with the rack 230 of the second wiper arm 200. This causes the second wiper arm 220 to slide in the first sliding direction when the roller 300 rotates along the first rotation direction T1, and to slide in the second sliding direction when the roller 300 rotates along the second rotation direction T2. ​​Alternatively, the control component 500 can control the connecting rod 420 to swing, so that the second conversion worm gear 440 meshes with the second worm portion 412 and simultaneously the second transmission gear 460 meshes with the rack 230 of the second wiper arm 200. This causes the second wiper arm 200 to slide in the second sliding direction when the roller 300 rotates along the first rotation direction T1, and to slide in the first sliding direction when the roller 300 rotates along the second rotation direction T2. ​​The first sliding direction refers to... Figure 1The direction shown in S1, the second sliding direction refers to Figure 1 The direction indicated by S2.

[0076] Furthermore, in coordination Figures 3 to 5 As shown, the inner wall of the first wiper arm 100 is provided with a guide rail 140 extending along its length. The outer wall of the second wiper arm 200 is provided with a groove 240 corresponding to the guide rail 140. The groove 240 can slide along the guide rail 140 to guide the second wiper arm 200 to slide in either a first sliding direction S1 or a second sliding direction S2.

[0077] Furthermore, in coordination Figures 12A to 14D As shown, the control assembly 500 includes a cam drive wheel 510 and a cam 520. The cam drive wheel 510 is coaxially connected to the rotating shaft 410 and is capable of rotating with the rotating shaft 410. The cam drive wheel 510 is located between the first worm portion 411 and the second worm portion 412. The cam 520 contacts the cam drive wheel 510 and is provided with a first small radius portion 521 and a second small radius portion 522 extending radially outward, and a first large radius portion 523 and a second large radius portion 524 are respectively provided between the first small radius portion 521 and the second small radius portion 522. The rotation of the cam drive wheel 510 can drive the cam 520 to rotate. When the first small radius portion 521 or the second small radius portion 522 contacts the cam drive wheel 510, the connecting rod 420 swings along the first swing direction, so that the first conversion worm gear 430 meshes with the first worm portion 411 and simultaneously the first transmission gear 450 meshes with the rack 230 of the second wiper arm 200. Thus, when the roller 300 rotates along the first rotation direction T1, the second wiper arm 200 slides towards the first sliding direction S1, and when the roller 300 rotates along the second rotation direction T2, the second wiper arm 200 slides towards the second sliding direction S2. When the first large radius portion 523 or the second large radius portion 524 contacts the cam drive wheel 510, the connecting rod 420 swings along the second swing direction, causing the second conversion worm gear 440 to mesh with the second worm portion 412 and simultaneously causing the second transmission gear 460 to mesh with the rack 230. This results in the second wiper arm 200 sliding towards the second sliding direction S2 when the roller 300 rotates along the first rotation direction T1, and the second wiper arm 200 sliding towards the first sliding direction S1 when the roller 300 rotates along the second rotation direction T2. ​​The first swing direction refers to... Figure 12A and Figure 12C The direction shown in W1, the second swing direction refers to Figure 12B and Figure 12D The direction indicated by W2 in the middle.

[0078] Furthermore, the contact surfaces of the cam drive wheel 510 and the cam 520 are rough surfaces, thereby ensuring that the cam drive wheel 510 can drive the cam 520 to rotate through the friction of the contact surfaces when rotating. Preferably, the contact surfaces of the cam drive wheel 510 and the cam 520 can be meshing tooth surfaces, which helps to ensure the stability and reliability of the wiper of this utility model.

[0079] Furthermore, in coordination Figure 10 As shown, the windshield 700 of this utility model has a fan-shaped structure, and corresponding to the overall working length of the wiper of this utility model, the windshield 700 can be divided into four regions with angles of α1, β1, β2 and α2.

[0080] The control process of the control component 500 will be explained below using the process of the wiper of this utility model completing one wiping in the working direction L as an example.

[0081] The wiper of this utility model starts from the initial position ( Figure 10 The windshield wiper of this utility model sequentially wipes four areas: α1, β1, β2, and α2. During this process, the roller 300 rotates along the first rotation direction T1. Correspondingly, it works in conjunction with... Figures 13A to 13D As shown, cam 520 rotates one revolution. Cam 520 is configured with a first small radius portion 521 corresponding to region α1 with a central angle γ1, a first large radius portion 523 corresponding to region β1 with a central angle δ1, a second small radius portion 522 corresponding to region β2 with a central angle δ2, and a second large radius portion 524 corresponding to region α2 with a central angle γ2. The radius of the first small radius portion 521 and the second small radius portion 522 is R1. The radius of the first small radius portion 523 and the second small radius portion 524 is R2.

[0082] When the wiper of this invention rotates to region α1 on the windshield 700, the cam 520 rotates so that the first small radius portion 521 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the first swing direction W1. This causes the second wiper arm 200 to slide towards the first sliding direction S1, thereby increasing the overall working length of the wiper and expanding its wiping range. When the wiper of this invention rotates to region β1 on the windshield 700, the cam 520 rotates so that the first large radius portion 523 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the second swing direction W2. This causes the second wiper arm 200 to slide towards the second sliding direction S2, thereby shortening the overall working length of the wiper to prevent it from extending beyond the windshield 700 and interfering with surrounding components. When the wiper of this invention rotates on the windshield 700 to enter the β2 region, the cam 520 rotates so that the second small radius portion 522 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the first swing direction W1, thereby causing the second wiper arm 200 to slide towards the first sliding direction S1, thus increasing the overall working length of the wiper and further increasing the wiping range of the wiper of this invention. When the wiper of this invention rotates on the windshield 700 to enter the α2 region, the cam 520 rotates so that the second large radius portion 524 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the second swing direction W2, thereby causing the second wiper arm 200 to slide towards the second sliding direction S2, thus shortening the overall working length of the wiper, to prevent the wiper of this invention from extending beyond the windshield 700 and interfering with surrounding components.

[0083] In this invention, the specific structure and working process of the control component 500 are described using only a fan-shaped structure for the windshield 700 as an example. However, it should be understood that the specific structure and working process of the control component 500 can be adjusted according to actual circumstances to achieve the same technical effect as described above. This is not intended to be limiting.

[0084] According to an exemplary embodiment of the present invention, in conjunction with Figure 9 and Figure 11As shown, a bracket 102 is provided on the inner wall of the first wiper arm 100. The bracket 102 includes a bracket body 150, a first extension 160, a second extension 170, and a third extension 180. Specifically, the bracket body 150 is a long plate type and can be fixed to the inner wall of the first wiper arm 100 by fasteners such as bolts. The first extension 160 is U-shaped and its middle portion is connected to one end of the bracket body 150. Two first shaft holes 161 corresponding to the rotation shaft 410 are respectively provided at both ends of the first extension 160. The second extension 170 is connected to the bracket body 150 near the middle and is provided with a second shaft hole 171 corresponding to the rotation shaft 410. The third extension 180 is connected to the other end of the bracket body 150 and is provided with a third shaft hole 181 corresponding to the rotation shaft 410. The rotating shaft 410 is rotatably inserted into the first shaft hole 161, the second shaft hole 171 and the third shaft hole 181, and the roller 300 is mounted between the two first shaft holes 161 via the rotating shaft 410.

[0085] Furthermore, in coordination Figure 6 , Figure 9 and Figure 11 As shown, a connecting hole 421 is provided in the middle of the connecting rod 420. A connecting shaft 172 is provided in the middle of the second extension 170. The connecting shaft 172 is inserted into the connecting hole 421 so that the connecting rod 420 can be oscillatingly connected to the second extension 170 of the bracket 102.

[0086] Furthermore, in coordination Figures 12A to 12D As shown, a strip-shaped hole 182 extending along the length direction is provided in the middle of the third extension 180. The connecting rod 420 passes through the strip-shaped hole 182 and can move within it. The strip-shaped hole 182 is used to prevent the connecting rod 420 from interfering with the third extension 180 during rotation while maintaining the stability of the connecting rod 420, thereby enabling the first conversion worm gear 430 and the second conversion worm gear 440 at both ends of the connecting rod 420 to better mesh with the first worm portion 411 and the second worm portion 412 at both ends of the rotating shaft 410.

[0087] According to an exemplary embodiment of the present invention, in conjunction with Figure 11As shown, the variable-length windshield wiper of this invention further includes an elastic member 600. The elastic member 600 is mounted to the bracket 102 and abuts against the connecting rod 420. The elastic member 600 is located between the first extension 160 and the second extension 170, near the second extension 170. The elastic member 600 may be pre-loaded with elastic force to increase the pressure abutting against the connecting rod 420, thereby allowing the first and second conversion worm gears 430 and 440 at both ends of the connecting rod 420 to better mesh with the first worm portion 411 and the second worm portion 412 at both ends of the rotating shaft 410. Preferably, in an exemplary embodiment of this invention, the bracket 102 is further provided with a mounting groove 190. The elastic member 600 is configured as a spring sheet, with one end inserted into the mounting groove 190 and the other end abutting against the connecting rod 420. Alternatively, the elastic member 600 may also be configured with other shapes. The type of elastic member 600 is not limited to this; it can be any form in the prior art, as long as it can achieve the above-mentioned functions.

[0088] The working process of the variable-length windshield wiper according to the present invention will be described below with reference to the accompanying drawings.

[0089] Under normal circumstances, such as Figure 10 As shown, the wiper of this utility model is in its initial state, that is, located on one side of the windshield 700.

[0090] When you need to use the windshield wipers of this invention, firstly, in conjunction with... Figure 10 and Figure 11 As shown, the wiper motor controls the first wiper arm 100 to rotate along the working direction L. The rotation of the first wiper arm 100 drives the roller 300 to rotate along the first rotation direction T1, thereby driving the rotating shaft 410 to rotate along the first rotation direction T1, so that the cam drive wheel 510, the first worm gear part 411 and the second worm gear part 412 provided on the rotating shaft 410 rotate along the first rotation direction T1.

[0091] Based on the change in the overall working length of the wiper of this utility model, this process can be divided into the first stage, the second stage, the third stage, and the fourth stage.

[0092] First stage: The first small radius portion 521 of the cam 520 contacts the cam drive wheel 510 (e.g., ... Figure 13A As shown), this causes the connecting rod 420 to swing along the first swing direction W1 (as shown). Figure 12A(As shown). The swinging of the connecting rod 420 along the first swing direction W1 causes the first conversion worm gear 430 to mesh with the first worm portion 411, and simultaneously causes the first transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the first worm portion 411 to drive the first conversion worm gear 430 to rotate, and further drives the first transmission gear 450 to rotate. The rotation of the first transmission gear 450 can cause the second wiper arm 200 to slide in the first sliding direction S1 (as shown). Figure 14A As shown in the diagram, this increases the overall working length of the wiper, thereby expanding the wiping range of the wiper of this invention. During this stage, the first wiper arm 100 rotates at an angle α1 along the working direction L.

[0093] Second stage: The first large radius portion 523 of cam 520 contacts cam drive wheel 510 (e.g.) Figure 13B As shown), this causes the connecting rod 420 to swing along the second swing direction W2 (as shown). Figure 12B (As shown). The swinging of the connecting rod 420 along the second swing direction W2 causes the second conversion worm gear 440 to mesh with the second worm portion 412, and simultaneously causes the second transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the second worm portion 412 to drive the second conversion worm gear 440 to rotate, and further drive the second transmission gear 460 to rotate. The rotation of the second transmission gear 460 can cause the second wiper arm 200 to slide in the second sliding direction S2 (as shown). Figure 14B (As shown), this shortens the overall working length of the wiper. During this stage, the first wiper arm 100 rotates at an angle β1 along the working direction L.

[0094] Third stage: The second small radius portion 522 of cam 520 contacts cam drive wheel 510 (e.g.) Figure 13C As shown), this causes the connecting rod 420 to swing along the first swing direction W1 (as shown). Figure 12C (As shown). The swinging of the connecting rod 420 along the first swing direction W1 causes the first conversion worm gear 430 to mesh with the first worm portion 411, and simultaneously causes the first transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the first worm portion 411 to drive the first conversion worm gear 430 to rotate, and further drives the first transmission gear 450 to rotate. The rotation of the first transmission gear 450 can cause the second wiper arm 200 to slide in the first sliding direction S1 (as shown). Figure 14C As shown in the diagram, this increases the overall working length of the wiper, thereby expanding the wiping range of the wiper of this invention. During this stage, the first wiper arm 100 rotates at an angle β2 along the working direction L.

[0095] Fourth stage: The second largest radius portion 524 of the cam 520 contacts the cam drive wheel 510 (e.g., Figure 13D As shown), this causes the connecting rod 420 to swing along the second swing direction W2 (as shown). Figure 12D (As shown). The swinging of the connecting rod 420 along the second swing direction W2 causes the second conversion worm gear 440 to mesh with the second worm portion 412, and simultaneously causes the second transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the second worm portion 412 to drive the second conversion worm gear 440 to rotate, and further drive the second transmission gear 460 to rotate. The rotation of the second transmission gear 460 can cause the second wiper arm 200 to slide in the second sliding direction S2 (as shown). Figure 14D (As shown), this shortens the overall working length of the wiper. During this stage, the first wiper arm 100 rotates at an angle α2 along the working direction L.

[0096] At this time, the wiper of this invention rotates to the other side of the windshield 700, and the wiper of this invention completes one wiping in the working direction L.

[0097] Then, in coordination Figure 15 As shown, the wiper motor controls the first wiper arm 100 to rotate along the working direction R. The rotation of the first wiper arm 100 drives the roller 300 to rotate along the second rotation direction T2, thereby driving the rotating shaft 410 to rotate along the second rotation direction T2, so that the cam drive wheel 510, the first worm gear part 411 and the second worm gear part 412 provided on the rotating shaft 410 rotate along the second rotation direction T2.

[0098] Based on the change in the overall working length of the wiper of this utility model, this process can be divided into the fifth stage, the sixth stage, the seventh stage, and the eighth stage.

[0099] Fifth stage: The second largest radius portion 524 of the cam 520 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the second swing direction W2. The swinging of the connecting rod 420 along the second swing direction W2 causes the second conversion worm gear 440 to mesh with the second worm portion 412, and simultaneously causes the second transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the second worm portion 412 to drive the second conversion worm gear 440 to rotate, and further drives the second transmission gear 460 to rotate. The rotation of the second transmission gear 460 causes the second wiper arm 200 to slide towards the first sliding direction S1, thereby increasing the overall working length of the wiper and increasing the wiping range of the wiper of this invention. In this stage, the first wiper arm 100 rotates at an angle α2 along the working direction R.

[0100] Sixth stage: The second small radius portion 522 of the cam 520 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the first swing direction W1. The swinging of the connecting rod 420 along the first swing direction W1 causes the first conversion worm gear 430 to mesh with the first worm portion 411, and simultaneously causes the first transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the first worm portion 411 to drive the first conversion worm gear 430 to rotate, and further drives the first transmission gear 450 to rotate. The rotation of the first transmission gear 450 causes the second wiper arm 200 to slide towards the second sliding direction S2, thereby shortening the overall working length of the wiper. In this stage, the first wiper arm 100 rotates at an angle β2 along the working direction R.

[0101] Seventh stage: The first large radius portion 523 of the cam 520 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the second swing direction W2. The swinging of the connecting rod 420 along the second swing direction W2 causes the second conversion worm gear 440 to mesh with the second worm portion 412, and simultaneously causes the second transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the second worm portion 412 to drive the second conversion worm gear 440 to rotate, and further drives the second transmission gear 460 to rotate. The rotation of the second transmission gear 460 causes the second wiper arm 200 to slide towards the first sliding direction S1, thereby increasing the overall working length of the wiper and expanding the wiping range of the wiper of this invention. In this stage, the first wiper arm 100 rotates at an angle β1 along the working direction R.

[0102] Eighth stage: The first small-radius portion 521 of the cam 520 contacts the cam drive wheel 510, causing the connecting rod 420 to swing along the first swing direction W1. The swinging of the connecting rod 420 along the first swing direction W1 causes the first conversion worm gear 430 to mesh with the first worm portion 411, and simultaneously causes the first transmission gear 450 to mesh with the rack 230 of the second wiper arm 200. This causes the first worm portion 411 to drive the first conversion worm gear 430 to rotate, and further drives the first transmission gear 450 to rotate. The rotation of the first transmission gear 450 causes the second wiper arm 200 to slide towards the second sliding direction S2, thereby shortening the overall working length of the wiper. In this stage, the first wiper arm 100 rotates at an angle α1 along the working direction R.

[0103] At this point, the wiper of this invention has completed one wipe in the working direction R and returned to its initial state.

[0104] For ease of interpretation and precise definition of the appended claims, the terms “upper,” “lower,” “upper side,” “lower side,” “upper side,” “lower side,” “left,” “left side,” “right,” “right side,” “front,” “forward,” “backward,” “backward,” “inner,” and “outer” are used to describe features of exemplary embodiments with reference to the positions of these features shown in the accompanying drawings.

[0105] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and descriptive purposes. It is not intended to be exhaustive, nor to limit the invention to the precise forms disclosed; obviously, many changes and variations are possible in accordance with the foregoing teachings. The exemplary embodiments were chosen and described to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to implement and utilize various exemplary embodiments of the invention, as well as their different alternatives and modifications. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A variable length wiper characterized by, The wiper device comprises: a first wiper arm rotatably mounted to a vehicle, the first wiper arm being provided with a first wiper blade and a first receiving slot; a second wiper arm slidably arranged in the first receiving slot, the second wiper arm being provided with a second wiper blade and a second receiving slot; a roller arranged on the first wiper arm and configured to rotate along a first rotation direction or a second rotation direction while being in contact with a surface of the windshield when the first wiper arm rotates to wipe the windshield; a transmission assembly arranged in the first receiving slot and at least partially located in the second receiving slot, the transmission assembly being connected to the roller and configured to cause the second wiper arm to slide along the first receiving slot when the roller rotates; a control assembly arranged on the transmission assembly and configured to control the transmission assembly to cause the second wiper arm to slide towards a first sliding direction or a second sliding direction, thereby changing a total working length of the wiper device. An inner side wall of the second wiper arm is provided with a rack extending along a length direction, and the transmission assembly comprises:

2. The variable length wiper of claim 1, wherein, a rotating shaft coaxially connected to the roller and provided with a first worm portion and a second worm portion having helical teeth opposite to those of the first worm portion; a connecting rod rotatably connected to the first wiper arm; a first conversion worm gear arranged at one end of the connecting rod and configured to mesh with the first worm portion; a second conversion worm gear arranged at the other end of the connecting rod and configured to mesh with the second worm portion; a first transmission gear fixedly connected to the first conversion worm gear and coaxial with the first conversion worm gear; and a second transmission gear fixedly connected to the second conversion worm gear and coaxial with the second conversion worm gear; wherein the control assembly is configured to control the connecting rod to swing so as to cause the first conversion worm gear to mesh with the first worm portion and simultaneously cause the first transmission gear to mesh with the rack, thereby causing the second wiper arm to slide towards the first sliding direction when the roller rotates along the first rotation direction and causing the second wiper arm to slide towards the second sliding direction when the roller rotates along the second rotation direction; or causing the second conversion worm gear to mesh with the second worm portion and simultaneously causing the second transmission gear to mesh with the rack, thereby causing the second wiper arm to slide towards the second sliding direction when the roller rotates along the first rotation direction and causing the second wiper arm to slide towards the first sliding direction when the roller rotates along the second rotation direction. The control assembly comprises: a cam driving wheel coaxially connected to the rotating shaft and configured to rotate with the rotating shaft, the cam driving wheel being located between the first worm portion and the second worm portion; and 3. The variable length wiper of claim 2, wherein, a cam in contact with the cam driving wheel and provided with a first small radius portion and a second small radius portion extending radially outward, and a first large radius portion and a second large radius portion being respectively arranged between the first small radius portion and the second small radius portion; and a control assembly arranged on the transmission assembly and configured to control the transmission assembly to cause the second wiper arm to slide towards a first sliding direction or a second sliding direction, thereby changing a total working length of the wiper device. ​ The rotation of the cam driving wheel can drive the cam to rotate, and when the first small radius part or the second small radius part is in contact with the cam driving wheel, the connecting rod swings along a first swing direction to make the first conversion worm gear mesh with the first worm part and simultaneously make the first transmission gear mesh with the rack; When the first large radius part or the second large radius part is in contact with the cam driving wheel, the connecting rod swings along a second swing direction to make the second conversion worm gear mesh with the second worm part and simultaneously make the second transmission gear mesh with the rack.

4. The variable length wiper of claim 3, wherein, The inner side wall of the first wiper arm is provided with a guide rail extending along the length direction, and the outer side wall of the second wiper arm is provided with a sliding groove corresponding to the guide rail, which can slide along the guide rail to guide the sliding of the second wiper arm towards a first sliding direction or a second sliding direction.

5. The variable length wiper of claim 4, wherein, The inner side wall of the first wiper arm is provided with a bracket, which comprises: a bracket body; a first extension part provided in a U shape and connected to one end of the bracket body, both ends of the first extension part are respectively provided with two first shaft holes corresponding to the rotating shaft; a second extension part connected to the bracket body near the middle part and provided with a second shaft hole corresponding to the rotating shaft; and a third extension part connected to the other end of the bracket body and provided with a third shaft hole corresponding to the rotating shaft; wherein the rotating shaft is rotatably inserted into the first shaft hole, the second shaft hole and the third shaft hole, and the roller is mounted to the two first shaft holes through the rotating shaft.

6. The variable length wiper of claim 5, wherein, The middle part of the connecting rod is provided with a connecting hole; The middle part of the second extension part is provided with a connecting shaft, which is inserted into the connecting hole, so that the connecting rod can be swingably connected to the first wiper arm.

7. The variable length wiper of claim 5 wherein, It further comprises: a resilient member mounted to the bracket and abutting to the connecting rod, which is located near the second extension part between the first extension part and the second extension part.

8. The variable length wiper of claim 7, wherein, The bracket is further provided with a mounting slot; The resilient member is provided in the form of a spring sheet, and one end of the resilient member is inserted into the mounting slot, and the other end of the resilient member abuts to the side wall of the connecting rod.

9. The variable length wiper of claim 1 wherein, The side walls of the first wiper arm and the second wiper arm are respectively provided with a clamping groove extending along the length direction; The first wiper blade and the second wiper blade are respectively provided with a clamping part corresponding to the clamping groove, which is inserted into the clamping groove, so that the first wiper blade is mounted to the first wiper arm and the second wiper blade is mounted to the second wiper arm.

10. The variable length wiper of claim 5 wherein, The middle part of the third extension part is provided with a strip-shaped hole extending along the length direction, and the connecting rod passes through the strip-shaped hole and can move in the strip-shaped hole.

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