KR20230040146A - A rubber blade with adjustable angle for different pressure of automobile wiper blade - Google Patents

Abstract

The present invention relates to a rubber blade provided in a vehicle wiper blade to wipe the glass surface by receiving the pressure and wiping movement of a wiper arm and, more specifically, to a rubber blade that includes one or more wiping parts for wiping a glass surface, one or more bending parts, and a fixing part for allowing the wiper part to adhere to remain bent at an appropriate rotation angle around the bending part. A fixing point and a fixing surface at an appropriate angle are placed in the fixing part, and a stop surface corresponding to the fixing point is formed on the upper side of the wiping part. Even when excessive pressure is applied to the wiper blade, the contact angle of the glass surface of a wiping contact part is prevented from being excessively reduced by changing the rotation angle of a wiping center part due to the change in position of a contact part due to the angle of the stop surface that is in close contact with the fixing point when the wiping part is bent and rotated.

Description

A rubber blade with adjustable angle for different pressure of automobile wiper blade}

The present invention is a rubber blade located on a wiper blade for a vehicle and performing wiping of a glass surface by receiving pressure and a wiping motion of a wiper arm, and more particularly, in a rubber blade including one or more wiping parts, the fixing part is fixed It is a pressure-responsive contact angle adjustable rubber blade configured to properly maintain the contact angle with the glass surface in response to excessive pressure outside the pressure range by forming a point and a fixing surface and forming an appropriate angle on the stop surface of the corresponding wiping part.

Generally, a wiper device for removing snow, rainwater, foreign substances, etc. present on the surface of a glass is installed in a vehicle, which is a wiper blade (10) fastened to a wiper arm (not shown) that performs a wiping motion by a wiper motor ) is a device that wipes the glass surface by wiping, and performs the function of securing the driver's field of vision.

A typical prior art wiper blade 10 is composed of a wiper frame 11 fastened to a wiper arm (not shown) and a rubber blade 20 supported by the wiper frame 11, as shown in FIG. 1, and the wiper arm ( The wiper frame 11 distributes and transmits the transmission pressure and wiping motion of (not shown) in the longitudinal direction of the rubber blade 20 to wipe the glass surface.

The rubber blade 20 has various forms, but there are two typical types of rubber blades 20 in the prior art, which have structures such as A and B in cross-sectional view of FIG. 2. In detail, the wiper frame 11 and The fixing part 30 that is fixed, the wiping part 50 that performs wiping, and the wiping between the fixing part 30 and the wiping part 50 as the center of the rotational motion, connecting the two parts and folding to perform the bending rotation The portion 40 is positioned and configured, and the rubber blade 20 is formed by extending the cross section thus configured in the longitudinal direction.

The structure and shape of the detailed cross-section when the rubber blade 20 of the prior art wipes the glass surface 70 is shown in the cross-sectional view of FIG. 3.

3, the wiping blade 54 of the wiping contact portion 53 of the wiping unit 50 receiving pressure and the glass surface 70 are placed in contact with each other, and the wiping movement force is received, and the wiping movement direction When the rubber blade 20 moves, the wiping blade 54 is in contact with the glass surface 70 due to frictional force, and the wiping portion 50 rotates by bending at the bent portion 40, rotating in the opposite direction of the wiping movement direction By doing this, the stopper 51 adheres to the fixing surface 31 and the wiper 50 moves in the direction of the wiping motion while maintaining the deformed shape while the wiping part 50 is bent by the designed angle. At this time, The wiping contact portion 53 receives pressure to cause fine deformation, and the wiping blade 54 is in contact with the glass surface 70 at an appropriate angle, so that the side surface of the wiping contact portion 53 and the glass surface 70 form an appropriate contact angle. It will perform wiping while keeping it clean.

However, in general, the design pressure of the wiper arm installed at the time of vehicle shipment is determined and then assembled and shipped, and the wiper blade designed to fit the pressure of the wiper arm is fastened and installed on the wiper arm to maintain the best wiping performance at the optimal pressure. Let it be. However, due to the characteristics of a vehicle in which only consumable wiper blades are replaced, there are many cases in which the pressure range of various wiper blades and rubber blades to be replaced and the pressure of the wiper arm, which is designed to be unadjustable because it is already determined, do not match each other.

When the optimal pressure is applied to the wiper blade 10, the wiping part 50 is bent at the folding part 40 as shown in FIG. 3 described above, so that the stopping part 51 adheres to the fixing surface 31, 53) is finely deformed, and the wiping property is optimal, but when the pressure of the wiper arm (not shown) is excessively higher than the appropriate pressure of the wiper blade 10, the bending part 40 and the wiping part 50 The stop portion 51 is in close contact with the fixing surface 31 and is fixed at the same angle, and only the wiping contact portion 53 is excessively deformed, causing problems such as those shown in FIG.

As shown in FIG. 4, when the pressure of the wiper arm (not shown) is excessively higher than the appropriate pressure of the wiper blade 10, the bent portion 40, the stop portion 51 and the fixed surface of the rubber blade 20 The triangular structure formed by (31) does not change significantly even when subjected to excessive pressure, so that the entire wiping portion 50 is subjected to excessive pressure, and the wiping contact portion 53 having the narrowest cross-sectional width in the wiping portion 50 receives excessive pressure and is the most While greatly deformed, a problem occurs in which the contact angle with the glass surface 70 is smaller than the appropriate angle, which significantly reduces the wiping property as the side of the wiping contact portion 53, rather than the wiping blade 54, begins to contact the glass surface. It's got a problem with it.

In order to solve this problem, the conventional rubber blade 20 of the wiper blade 10 has attempted to increase the hardness of the material of the rubber blade 20 or increase the cross-sectional thickness as a countermeasure against excessive pressure, but this method is When the pressure of the wiper arm (not shown) is low due to the narrowing of the appropriate pressure range of the blade 20, the bending angle of the wiping part 50 is insufficient and the contact angle of the glass surface 70 becomes excessively large. This is creating another problem that gets worse.

As a prior invention related to the improvement of the problem of responding to the pressure of the rubber blade, there is Patent Publication No. 10-2009-0087882, which proposes a structure having a profile including a hollow space inside the rubber blade. The structure is very complicated, the manufacturing method has disadvantages, and the structural problem of maintaining the same angle of the wiping part against excessive pressure has not been solved.

As another prior invention, Patent Registration No. 10-1592614 has proposed a method of intermittently positioning a low-noise profile between the wiping part and the fixing part, but this structure may be effective in reducing noise, but it is It is difficult to see it as an improvement structure.

Republic of Korea Patent Publication No. 10-2009-0087882 Republic of Korea Patent Registration No. 10-1592614

The present invention was conceived to solve the above problems, and is configured to maintain wipeability by preventing the contact angle with the glass surface from being excessively deformed when excessive pressure is applied to the rubber blade. The purpose is to provide a pressure-responsive rubber blade that does.

In order to achieve the above object, according to an embodiment of the present invention, a fixing surface having an appropriate angle with the center line is formed on the fixing part of the rubber blade, the fixing point is located at the lower end of the fixing surface, and the center line and By placing a stop surface with a certain angle, the wiping part of the rubber blade is bent around the bent part, and the stop surface that comes into close contact with the fixed point in the state of wiping movement is adjusted according to the angle according to the height, and the bending of the wiping part Provided is a pressure-response contact angle adjustable rubber blade that corrects excessive bending of the wiping contact by adjusting the rotation angle.

Accordingly, according to the rubber blade of the present invention, even if excessive pressure is applied to the rubber blade and the wiping contact portion is excessively deformed due to the excessive pressure of the wiping portion, the folding angle of the wiping portion is corrected to maintain the contact angle and ensure wiping properties. By applying the rubber blade characterized in that, it is possible to provide a wiper blade rich in compatibility capable of responding to various vehicles having various wiper arm pressures.

1 is a perspective view showing the structure of a wiper blade.
2 is a cross-sectional view showing the structure of a prior art rubber blade.
Figure 3 is a cross-sectional view showing the structure when the rubber blade of the prior art performs wiping.
Figure 4 is a cross-sectional view showing a deformed state when a rubber blade subjected to excessive pressure of the prior art performs wiping.
5 is a cross-sectional view showing the structure of a rubber blade according to an embodiment of the present invention.
6 is a cross-sectional view showing an angle between a stop surface and a fixing surface of a rubber blade according to an embodiment of the present invention.
7 is a cross-sectional view showing a corresponding structure and state so that the contact angle does not become excessively small even when excessive pressure is applied when wiping a rubber blade according to an embodiment of the present invention.
8 is a cross-sectional view showing the result of simulating the contact angle of the actual wiping contact part of the rubber blade subjected to excessive pressure in an embodiment of the present invention.
9 is a cross-sectional view showing the structure of a rubber blade formed of two wiping parts according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention.

As shown in FIG. 5, looking at the structure of the rubber blade 20 having the contact angle adjusting structure in response to pressure according to an embodiment of the present invention, the center line 60 of the fixing part 30 of the rubber blade 20 Forming a fixing surface 31 in the form of an inclined surface having an angle inclined downward in the outward direction, forming a fixing point 32 at the end of the fixing surface 31, and a center line on the side of the wiper 50 ( 60) Forming a stop surface 52 of an angle inclined downward in the reference outward direction, and connecting the fixing part 30 and the wiping part 50 through the bending part 40, the rubber blade 20 When wiping proceeds, as shown in FIG. 6, the wiping part 50 rotates around the bent part 40 so that the stop surface 52 of the wiping part 50 is the fixed point of the fixing part 30 ( 32) and forms an appropriate angle with the fixing surface 31.

As shown in FIG. 6, looking at the angle formed between the fixing surface 31 and the stop surface 52 of the rubber blade 20 according to the embodiment of the present invention, the fixing part 30 as shown in A of FIG. A fixed surface 31 formed at an angle of Θ1 with the center line 60 as an inclined surface having an angle inclined downward in the outward direction is located at the lower end of the fixed surface 31, forming a fixed point 32 at the lower end of the , The upper side surface of the wiping unit 50 has a stop surface 52 formed at an angle of Θ2 with the center line 60 as an inclined surface having an angle inclined downward in the outward direction.

As shown in B of FIG. 6, the wiping portion 50 rotates around the folding portion 40, and the stop surface 52 formed on the upper side of the wiping portion 50 is located at the lower end of the fixing portion 30 When in close contact with the fixing point 52 located at the lower end of the fixing surface 31, the center line 60 and the wiping center line 61 of the wiping unit 50 form an angle of Θ3, and the rotated stop surface 52 ) is located at an angle of Θ4 with the center line 60. Therefore, Θ4 is the sum of Θ2 and Θ3.

In this state, when the wiping unit 50 moves upward due to excessive pressure, the rotated stop surface 52 rotates the folding rotation to the opposite rotation when moving in the upward direction due to the angle formed in close contact with the fixed point 32 Since it must be formed in an extruded state, the angle Θ4 formed by the center line 60 and the rotated stop surface 52 must be formed within the range of 85 ° to 10 °. Regarding the range of angle 85 ° ~ 10 ° of Θ4, when the angle Θ4 formed by the rotated stop surface 52 is 85 ° or more, the effect of pushing to the side is reduced, and when Θ4 is 10 ° or less, the wiping part (50 ), the force holding it in place decreases. In addition, the fixed point 32 is located inside the entire length of the rotated stop surface 52, so that even if slight deformation occurs as an elastic body due to the nature of the material of the rubber blade 20, the fixed point 32 rotates the stop surface ( 52), and should be positioned so as to make use of the angular effect of the rotated stop surface 52.

In addition, when the rotated stop surface 52 is pushed in the opposite direction of rotation from the fixed point 32 at an angle of Θ4, opposite rotation occurs around the bent portion 40, so that the rotated stop surface 52 also rotates in the opposite direction The angle formed with the fixing surface 31 becomes small. Therefore, the angular distance between the rotated stop surface 52 and the fixed surface 31 is required, and the angle Θ4 formed by the rotated stop surface 52 and the center line 60 and the fixed surface 31 are separated from the center line 60 The angular difference of the angle Θ1 formed must be maintained at 0° to 45°, and if these angle requirements are met, the angular range of Θ1 can be determined.

After forming the angle Θ4 of the stationary surface 52 rotated in the above way, when the wiping unit 50 is returned to its original position, Θ2 = Θ4 - Θ3 in A of FIG. 6, which is not wiping, The length of the stop surface 52 can be determined according to the position of the fixing point 32 and Θ2, which is the angle between the surface 52 and the center line 60.

During actual operation of the rubber blade 20 having the same structure as shown in FIGS. 5 and 6, the angle formed between the fixed point 32 and the rotated stop surface 52 adjusts the bending of the wiping unit 50 so that the wiping contact unit 53 ) Regarding the operation of preventing excessive bending, even when the rubber blade 20 having the structure according to the embodiment of the present invention in FIG. 7 is subjected to excessive pressure while performing a wiping motion, there is A structure that achieves an appropriate contact angle is shown through A, B, and C of FIG.

7A shows the operation during the wiping movement of the rubber blade 20 within the appropriate pressure range, and since the wiping blade 54 is in contact with the glass surface and stopped by friction, the wiping unit 50 is wiping In the opposite direction to the movement direction, the bending rotation is bent at the bending portion 40, and the stopping surface 52 is in close contact with the fixing point 32 of the fixing portion 30, while the bending rotational motion is stopped, and the wiping portion 50 As the wiping contact portion 53 of ) is finely deformed by the pressure, the side surface of the wiping contact portion 53 and the glass surface 70 form an appropriate contact angle to appropriately perform the wiping of the glass surface 70.

On the other hand, when the pressure of the wiper arm (not shown) is greater than the appropriate pressure of the wiper blade 10, excessive pressure is applied to the wiping unit 50 as shown in B of FIG. Since it is in contact with, the wiping contact portion 53 is pressed by the pressure, so the contact angle becomes small, and the bent portion 40 is compressed while the rotated stop surface 52 moves upward, a phenomenon as shown in FIG. 7 B Occurs.

In FIG. 7B, when the wiping part 50 moves upward, the moving distance is indicated by the rotated stop surface 52 indicated by a virtual line, and the bent part 40 is compressed upward by receiving pressure. will do As shown in B of FIG. 7, the fixing point 32 and the fixing surface 31 generate a pushing force in the opposite direction according to the angle of the rotated stop surface 32 indicated by a virtual line, and the bent portion ( 40) acts as a rotating force in the opposite direction from the center.

As shown in C of FIG. 7, as the rotated stop surface 52 moves upward, a phenomenon of pushing the inclined surface between the fixing point 32 and the rotated stop surface 52 occurs, which causes P in the direction of wiping progress. Pressure is generated to generate an effect of pushing the entire wiping part 50 in the opposite direction, so that the entire wiping part 50 rotates in the opposite direction around the bent part 40, so that the wiping contact part 53 is excessively The angle correction that the wiping unit 50 compensates for the deformation occurs, compensating for the excessively small contact angle between the side surface of the wiping contact unit 53 and the glass surface 70.

As shown in FIG. 8, as a result of simulating the change in contact angle with the glass surface 70 in the bending of the wiping unit 50 at normal pressure and excessive pressure according to an embodiment of the present invention,

In the case of normal pressure, as shown in A of FIG. 8, the wiping blade 54 receives pressure and contacts the glass surface 70 to generate frictional force while the wiping portion 50 rotates around the folded portion 40 So, while the rotated stop surface 52 located on the upper side of the wiping unit 50 is in close contact with the fixing point 32 of the fixing unit 30, the bending angle between the center line 60 and the wiping center line 61 is 30 ° is formed At normal pressure, the wiping contact portion 53 is deformed by 3 ° from the wiping center line 61, so that the angle between the glass surface and the side of the wiping contact portion 53 is formed at 57 °, so that the glass surface 70 is wiped.

On the other hand, in the case of excessive pressure, as shown in B of FIG. 8, the wiping blade 54 receives pressure to maintain frictional force with the glass surface 70 and stops, and the bent portion 40 subjected to excessive pressure is bent upward (40) When a compression deformation of 10% of the total length is caused, the wiping part 50 rotates around the bent part 40 in a state of moving upward by 0.07 mm, and on the upper side of the wiping part 50 When the positioning stop surface 52 goes up in an upward direction and comes into close contact with the fixing point 32 of the fixing part 30, the contact part moves to the right due to the angle of the rotated stop surface 52, so that the bent part 40 ) Since the rotation angle of the wiping unit 50 around the center becomes smaller, the bending angle between the center line 60 and the wiping center line 61 is formed at 27 °. In the excessive pressure, even if excessive deformation occurs in the wiping contact portion 53, which is 6 ° deformation, which is twice the normal pressure at the wiping center line 61, the glass surface and the wiping contact portion 53 due to the angle correction effect according to the embodiment of the present invention The angle formed by the side surfaces is formed at 57°, the same as the normal pressure, so that the glass surface 70 is wiped.

As shown in FIG. 9, in the rubber blade 20 including two wiping parts 50 and two bending parts 40 according to another embodiment of the present invention, the outside of each wiping part 50 The stop surface 52 is formed only on the surface, and the location of the fixing point 32 and the fixing surface 31 of the fixing part 30 and the operating principle of being in close contact with the stop surface 52 and the effect of the present invention are shown in FIG. , as described in FIGS. 7 and 8, it can be regarded as the same.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the claims are also It is included in the scope of the rights of the invention.

10: wiper blade
11: wiper frame
20: rubber blade
30: fixed part
31: fixed surface
32: fixed point
40: bend
50: wiping unit
51: stop
52: stationary surface
53: wiping contact
54: polishing blade
60: center line
61: wipe center line
70: glass surface

Claims (1)

A rubber blade of a wiper blade for a vehicle, comprising: one or more wiping parts including a wiping contact part for wiping a glass surface; one or more bending parts connected to the wiping part and performing a bending motion; In the rubber blade including a fixing part for fixing the rotation angle,
A fixing surface inclined outwardly and downwardly located at the lower end of the fixing part is formed at an angle Θ1 with the center line, and a fixing point is located at the lower end of the fixing surface, and a stop inclined downward in an outward direction is located on the upper side of the wiping part. The surface is formed at an angle Θ2 with the center line, and when the wiping part rotates by bending around the bent part so that the stop surface is in close contact with the fixing point, the center line and the wiping center line form an angle of Θ3, the center line and the angle Θ4 formed by the rotated stop surface is formed in the range of 10 ° to 85 °, and the angle difference between the angle Θ4 formed by the rotated stop surface and the center line and the angle Θ1 formed by the fixed surface and the center line is 0 ° to 85 °. A rubber blade including a fixing surface formed at 45°, a fixing part, and a stop surface.

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