Plate wiper arm with multi-point depression structure

Abstract

The application discloses a plate-type squeegee arm with a multi-point pressing structure, which comprises a squeegee arm base, a squeegee piece assembly hinged with a connecting piece, and a squeegee arm assembly arranged between the squeegee arm base and the connecting piece. The squeegee arm assembly comprises an elastic member connected with the squeegee arm base and an elastic squeegee arm for rotating the connecting piece around the squeegee arm base. The multi-point pressing structure formed by the elastic member and the squeegee arm can control the change of the pressing force on the squeegee piece assembly while the squeegee piece assembly obtains a compensation angle in the working lifting process. The change of the pressing force on the squeegee piece assembly is controlled at about 15% through the squeegee arm with elastic performance and the elastic member for applying force on the side of the squeegee arm body, the hole shaft and the limiting structure in the squeegee arm base, so that the wear of the squeegee piece assembly is delayed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile wiper, in particular to a plate type wiper arm with multi-point down pressure structure. BACKGROUND

[0002] Figure 1 In the prior art, most of the small wiper arms of vehicles adopt the structure of canceling the traditional metal wiper arm and assisting the spring leaf through the large plastic shell. Under this structure, the plastic shell occupies a large space, so that the wiper is difficult to be stored in the gap inside the exterior trim.

[0003] US3480985A discloses a flat spring wiper arm, which comprises a single piece of uniform thin gauge spring steel, tapering in width from a maximum at its hub end to a minimum at the wiper blade attachment end. It is itself arched and shaped to complement the curvature of the windscreen of the vehicle for which it is intended, and provides the necessary pressure for proper windscreen wiping action.

[0004] DE102012112526A1 discloses a motor vehicle window wiper, the wiper arm is designed as a spring rail, a slider connected to the wiper blade can be adjusted longitudinally on the spring rail, and a cover is connected with the slider and can be connected to the wiper shaft in such a way. The lifting angle of the wiper rod can be compensated.

[0005] The wiper arm structures disclosed in the above two patents only provide down pressure to the wiper blade assembly through the plate spring wiper arm to ensure that the wiper blade assembly closely adheres to the glass surface during work. In order to match the design of the automobile, the front and rear windshields of the automobile on the market are mostly designed as multi-curvature glass, so that the wiper blade assembly will have multiple lifting actions during work to adapt to the glass surface, and the lifting stroke is close to 5mm-7mm. Based on the technical solutions disclosed in the above two patents, the down pressure of the wiper blade is proportional to the lifting distance during work, and the change of the working pressure of the wiper blade is ≥50%. The working pressure fluctuation higher than 15% will cause abnormal noise, excessive wear and other problems of the wiper assembly, and reduce the service life of the wiper blade. SUMMARY

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0007] The plate type wiper arm with multi-point down pressure structure comprises a wiper arm base, a wiper blade assembly hinged with a connecting piece, and a wiper arm assembly arranged between the wiper arm base and the connecting piece, wherein the wiper arm assembly comprises:

[0008] an elastic member connected with the wiper arm base;

[0009] The elastic squeegee arm rotates the connecting piece around the squeegee arm base, and the multi-point force applying structure formed by the elastic member and the squeegee arm controls the change of the downward pressure on the connecting piece and the squeegee blade assembly during the working lifting process while the squeegee arm assembly compensates the angle.

[0010] In a preferred embodiment of the present application, the squeegee arm assembly is rigidly connected with the connecting piece and hingedly connected with the squeegee arm base, so that the connecting piece and the squeegee blade assembly can rotate and lift around the squeegee arm base.

[0011] In a preferred embodiment of the present application, the elastic member has a first torsion arm, a second torsion arm and a bending part connected with the first and second torsion arms to form a spring structure, the first torsion arm is connected with the squeegee arm base, and the second torsion arm applies a downward pressure on the squeegee arm under pre-tightening.

[0012] In a preferred embodiment of the present application, the end of the first torsion arm has a first fixed end for connecting with the squeegee arm base, and the end of the second torsion arm has a second fixed end for connecting with a fixed notch on the squeegee arm.

[0013] In a preferred embodiment of the present application, the squeegee blade side of the squeegee arm is provided with a fixed through hole for further limiting after the rigid connection with the connecting piece.

[0014] In a preferred embodiment of the present application, the squeegee arm is a long strip-shaped plate spring.

[0015] In a preferred embodiment of the present application, the elastic member is a single torsion coil spring.

[0016] In a preferred embodiment of the present application, a second connecting hole is provided in the squeegee arm base, and the squeegee arm is hingedly connected through a rotating shaft arranged in the second connecting hole.

[0017] In a preferred embodiment of the present application, the squeegee arm base further has a cavity and a stopper, the cavity is located on one side of the second connecting hole, the lower part of the cavity is provided with a stopper, and the squeegee arm enters the cavity through an opening provided on the side surface of the squeegee arm base and then penetrates into the second connecting hole.

[0018] In a preferred embodiment of the present application, the stop surface on the upper side of the stopper and the hole top surface on the top of the opening form a limit of the maximum angle of the squeegee arm swing.

[0019] In a preferred embodiment of the present application, the two side walls of the second connecting hole are further respectively provided with a through hole and a groove, and the squeegee arm penetrates through the groove, passes through the second connecting hole and the rotating shaft and is inserted into the through hole.

[0020] The present application has the advantages of:

[0021] The plate-type squeegee arm with multi-point pressing structure provided by the present application controls the variation of the pressing force on the squeegee blade assembly to about 15% by the squeegee arm with elastic performance, the elastic member exerting force on the side of the squeegee arm body, the hole shaft in the squeegee arm base and the limiting structure, thereby delaying the wear of the squeegee blade assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced.

[0023] Figure 1 is a schematic diagram of the prior art.

[0024] Figure 2 is a schematic diagram of the present application.

[0025] Figure 3 is an exploded view of Figure 1 .

[0026] Figure 4 is a structural diagram of the squeegee arm and the connecting piece.

[0027] Figure 5 is a structural diagram of the elastic member.

[0028] Figure 6 is an axial view of the squeegee arm base.

[0029] Figure 7 is a front perspective view of Figure 6 .

[0030] Figure 8 is a top view of the present application.

[0031] Figure 9 is an A-A sectional view of Figure 8 .

[0032] Figure 10 is a perspective view of Figure 2 .

[0033] Figure 11 is a B-B sectional view of Figure 10 .

[0034] Figure 12 is a C-C sectional view of Figure 10 .

[0035] Figure 13 is one of the analysis schematic diagrams of the present application.

[0036] Figure 14 is the second analysis schematic diagram of the present application. DETAILED DESCRIPTION

[0037] In the description of the application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship of the device or element being indicated. The above description is simplified for the convenience of describing the application and does not indicate or imply that the device or element being indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

[0038] It can be understood that although the terms "first", "second" and the like can be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, the first element can be called the second element without departing from the teachings of the present application.

[0039] In the description, when an element is said to be "on", "fixed to", "connected to", "joined to" or the like another element, the element can be directly on, fixed to, connected to, joined to or in contact with the other element, or there can be an intermediate element.

[0040] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood, however, that the present application can be presented in various different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. In all the drawings, the same reference numerals denote the same or functionally equivalent elements.

[0041] Reference Figure 2 and Figure 3 The plate-type squeegee arm with a multi-point down structure shown mainly includes a connecting piece 10, a squeegee arm 20, a squeegee blade assembly 30, a rotating shaft 40, an elastic member 50 and a squeegee arm base 60.

[0042] Reference Figures 4 to 7The scraping arm 20 is a strip spring part connected between the scraping arm base 60 and the connecting piece 10. A fixed through hole 24 is formed on the scraping blade side 22 of the scraping arm 20, and a fixed slot 23 is formed on the vehicle body side 21. The elastic member 50 includes a first torsion arm 52 and a second torsion arm 53 extending towards the same side, and a bending part 51 connecting the two torsion arms. The elastic member 50 has a certain elastic recovery performance. When the first torsion arm 52 and / or the second torsion arm 53 rotate away from the original position, energy storage occurs at the bending part 51, so that the first torsion arm 52 and / or the second torsion arm 53 have a reverse recovery trend. The end of the first torsion arm 52 is provided with a first fixed end 52a, and the end of the second torsion arm 53 is provided with a second fixed end 53a. A second connecting hole 62 is formed in the middle of the side wall of the scraping arm base 60. An opening 68 is formed on the side of the scraping arm base 60 close to the scraping arm 20, and the top surface 68a of the opening forms a Z-direction downward protruding protrusion 63. A cavity 67 is formed between the second connecting hole 62 and the opening 68, and a stop portion 66 is arranged at the bottom of the cavity 67. The stop surface 66a and the top surface 68a form a Z-direction upward limiting structure. A through hole 65 is formed on the side of the second connecting hole 62 close to the opening 68, and a recess 64 is formed on the side of the first connecting hole 61 close to the second connecting hole 62. The vehicle body side 21 of the scraping arm 20 is inserted into the recess 64 after passing through the opening 68, the cavity 67, the through hole 65, the second connecting hole 62 and the rotating shaft 40 in the second connecting hole 62 in sequence. The two sides of the rotating shaft 40 are similar to the second connecting hole 62 and are provided with a pair of openings 41. By placing the rotating shaft 40 in the second connecting hole 62, the scraping arm 20 passes through the two openings 41 to form a hinged connection relationship between the scraping arm 20 and the scraping arm base 60, and the stop surface 66a and the top surface 68a limit the swing angle α of the scraping arm 20. The side of the scraping arm base 60 away from the scraping arm 20 is also provided with a first connecting hole 61 for fixing the vehicle body motor.

[0043] By reference Figures 8 to 12 After the scraping arm 20 is inserted into the scraping arm base 60, the two sides thereof are spaced apart from the hole side surface 68b of the opening 68 to form a gap fit relationship. By clamping the first fixed end 52a on the protrusion 63 and the second fixed end 53a on the fixed slot 23, the fixation of the scraping arm 20 relative to the scraping arm base 60 is completed. The scraping blade side 22 of the scraping arm 20 is inserted into the connecting piece 10 and fixed by interference fit, and further locked by the fixed through hole 24 and the step in the connecting piece 10.

[0044] Figure 13 And Figure 14 The analysis diagram of the present application is shown. The axis of the rotating shaft 40 is O, the force point of the second torsion arm 53 and the scraping arm 20 is B, and the force point of the scraping arm 20 to the scraping blade assembly 30 through the connecting piece 10 is A.

[0045] When the scraping blade assembly 30 is in the initial state of work:

[0046] After the elastic member 50 is assembled, it generates a pre-deformation L1 according to the setting, and the elastic force value F1=L1 / K1 provided by it in this pre-deformation condition, K1 being the deformation amount required by the spring to generate 1N of elastic force. After the wiper arm 20 is assembled, it generates a pre-deformation l1, and k1 is the deformation amount required by the wiper arm 20 to generate 1N of elastic force. The downforce provided by the elastic member 50 to the wiper blade assembly 30 through the wiper arm 20 is f1=OB*F1 / OA, and OB and OA are the lengths of the corresponding points in the figure.

[0047] When the wiper blade assembly 30 is lifted by 5mm due to work:

[0048] Let the deformation amount of the elastic member 50 be x, and the elastic force value be F2. The downforce provided by the wiper blade assembly 30 to the elastic member 50 is f2, and the lifting amount of the wiper blade assembly 30 is 5mm=Y1+Y2, Y1 being the lifting amount caused by the deformation of the wiper arm 20, and Y2 being the lifting amount caused by the rotation of the wiper arm 20 around point O.

[0049] In an embodiment of the present application, K1=0.32mm / N, L1=8mm, OB=28mm, OA=176mm, and f1=4N is obtained. According to F2=x / 0.32, f2=F2*28 / 176, Y1=1.76*f2, and Y2 / 176=x / 28, x=0.7mm, Y1=0.616mm, and Y2=4.384mm are obtained. f2 / f1=8.75%, which is much smaller than the target value of 15%. If a traditional leaf spring structure mentioned in the background art is used, all 5mm of lifting amount is achieved through the deformation of the wiper arm 20 itself, and the change amount of the pressure is about 42%, which is much larger than the existing 8.75%.

Claims

1. A plate wiper arm having a multi-point depression structure, comprising: The squeegee arm base, the squeegee blade assembly hinged with the connecting piece, the squeegee arm assembly arranged between the squeegee arm base and the connecting piece, characterized in that the squeegee arm assembly comprises: a resilient member connected with the squeegee arm base; a resilient squeegee arm for rotating the connecting piece around the squeegee arm base, the multi-point force applying structure formed by the resilient member and the squeegee arm controls the change of the downward pressure on the connecting piece and the squeegee blade assembly during the working lifting process and makes the connecting piece and the squeegee blade assembly obtain the compensation angle through the squeegee arm assembly; the rigid connection between the squeegee arm assembly and the connecting piece and the hinge between the squeegee arm assembly and the squeegee arm base make the connecting piece and the squeegee blade assembly rotate and lift around the squeegee arm base; the resilient member has a first torsion arm, a second torsion arm and a bending part connected with the first torsion arm and the second torsion arm to form a spring structure, the first torsion arm connected with the squeegee arm base and the second torsion arm under pre-tightening apply the downward pressure on the squeegee arm.

2. The plate-type wiper arm having a multi-point depression structure according to claim 1, wherein the end of the first torsion arm has a first fixed end for connecting with the squeegee arm base, and the end of the second torsion arm has a second fixed end for connecting with the fixed slot on the squeegee arm.

3. The multi-point depressible plate wiper arm of claim 1, wherein, the squeegee blade side of the squeegee arm is provided with a fixed through hole for further limiting after the rigid connection with the connecting piece.

4. The multi-point depressible plate wiper arm of claim 1, wherein, the squeegee arm is a long strip-shaped plate spring.

5. The multi-point depressible plate wiper arm of claim 4, wherein, the resilient member is a single torsion coil spring.

6. The multi-point depressor plate-type wiper arm according to any one of claims 1 to 5, wherein a second connecting hole is arranged in the squeegee arm base, and the squeegee arm is hinged through a rotating shaft arranged in the second connecting hole.

7. The multi-point depressible plate wiper arm of claim 6, wherein, the squeegee arm base also has a cavity and a stopper, the cavity is located on one side of the second connecting hole, and the cavity is provided with a stopper at the lower part, the squeegee arm enters the cavity through the opening arranged on the side surface of the squeegee arm base and then penetrates into the second connecting hole.

8. The multi-point depressible plate wiper arm of claim 7, wherein, the stop surface on the upper side of the stopper and the hole top surface on the top of the opening form the limit of the maximum angle of the squeegee arm swing.

9. The multi-point depressor-equipped plate wiper arm according to claim 6, wherein the two side walls of the second connecting hole are also respectively provided with a through hole and a groove, and the squeegee arm penetrates through the groove, the second connecting hole and the rotating shaft and is inserted into the through hole.

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