KR20230017617A - Wiper blade with low noise rubber blade - Google Patents

Abstract

The present invention relates to a wiper blade for a vehicle, which is able to allow a pressure spring supported by a connector receiving the pressure of a wiper arm to distribute the pressure in a longitudinal direction, allow a cleaning unit of a rubber blade supported by the pressure spring and conveying the pressure to perform a wiping motion, and clean a glass surface thereby. A lower fixing unit of the rubber blade is formed in a curved shape at an angle lowered towards an outer side. The lower fixing unit minimizes an impact generated when the rubber blade comes in contact with the pressure spring during the cleaning and reversing operation of the rubber blade, thereby reducing reversing noise.

Description

Wiper blade comprising a noise reduction rubber blade {Wiper blade with low noise rubber blade}

The present invention is a wiper blade for a vehicle, in which the lower fixing part of the rubber blade located on the pressure spring and wiping the glass surface minimizes the impact generated while contacting the pressure spring during the wiping reversal operation, thereby reducing the reversal noise. Noise reduction rubber, characterized in that It relates to a wiper blade comprising a blade.

In general, a wiper device for removing snow, rainwater, foreign substances, etc. present on the surface of a glass surface is installed in a vehicle, and this is a device for wiping the glass surface by wiping the wiper blade by a wiper motor. It performs the function of securing.

The wiper blade has a connection part that receives the rotation and pressure of the wiper arm, and the connection part supports the pressure spring and transmits rotational force and pressure. Also, the pressure spring supports the rubber blade in the longitudinal direction and transmits pressure evenly throughout the length direction of the rubber blade. has a structure that In general, the rubber blade has a fixing part coupled with a pressure spring, and a wiping part for wiping the glass surface is located at the bottom of the fixing part.

The wiper blade connected to the wiper arm receives the rotational force and pressure of the wiper arm at the same time to perform a wiping motion to wipe the glass surface.

In general, the wiping motion of a wiper blade for a vehicle is a 1/4 circular motion while reciprocating from the lower end of the vehicle glass to the side surface in a direction perpendicular to the longitudinal direction of the wiper blade. As a result, the wiping part performs a pendulum motion, and at the same time, a pendulum motion centered on the center of the rubber blade also occurs, so that the lower fixing part in contact with the lower end of the pressure spring also repeats the process of falling away from the pressure spring and then contacting it again. do.

Whenever the pendulum motion of the wiper blade is reversed, impact noise is generated in the process of the lower fixing part and the pressure spring repeatedly falling and contacting again. If it resonates with other parts of the blade, the noise can become significantly louder and cause dissatisfaction to the operator.

In addition, there is always water droplets between the lower fixing part and the pressure spring due to the characteristics of the wiper blade, and when the lower fixing part contacts the pressure spring and water at the same time and causes an impact, a problem in that noise increases.

Korean Patent Publication No. 10-2005-0060146 is a prior invention designed to solve the problems of the rubber blade reversal noise, but there is an invention in which a buffer shock absorbing structure is placed between the wiping portion and the stop portion of the rubber blade. This method has a structural defect that does not sufficiently secure the wiping ability, which is the original role of the wiper blade, and also does not solve the problem of impact noise between the pressure spring and the lower fixing part, which are the main causes of noise. can be seen as a rescue.

As another prior invention, there is US Patent No. 9718443, similar to the purpose of the present invention, in order to solve the problem of impact noise between the upper and lower fixing parts of the rubber blade and the pressure spring, the upper fixing part and the lower fixing part of the rubber blade It was invented to reduce the impact generated during contact by reducing the contact area with the pressure spring by creating a structure with several grooves dug into the top, but this structure is insufficient to greatly reduce the impact and noise generated during contact. , rather, there is a possibility that the noise will increase due to air resonance in the dug groove.

Korean Patent Publication No. 10-2005-0060146 US Patent No. 9718443

The present invention was conceived to solve the above problems, and when reversing in the wiping motion of the wiper blade, the lower fixing part and the pressure spring are repeatedly dropped and contacted again. The fundamental problem of noise is reduced by reducing the impact It is an object of the present invention to provide a wiper blade capable of solving the problem.

In order to achieve the above object, according to an embodiment of the present invention, the surface formed by the lower fixing part of the rubber blade located at the lower end of the pressure spring is formed in a curved line lowering outward rather than a straight line, so that the lower fixing part of the rubber blade Provided is a wiper blade configured to reduce reversal noise by reducing shock generated by inducing sequential line contact rather than instantaneous full surface contact with a pressure spring during the pendulum motion reversal operation of the rubber blade.

Accordingly, according to the wiper blade including the reverse noise reducing rubber blade of the present invention, the shock generated during the reverse contact between the pressure spring and the rubber blade generated during wiper operation is greatly reduced and the reverse noise is reduced and mitigated to solve the problem You will be able to do it.

1 is a front view and a cross-sectional view illustrating the structure of a conventional wiper blade.
2 is a cross-sectional view of a conventional wiper blade in a stopped state without receiving pressure.
3 is a cross-sectional view showing the position of a pressure spring and the deformation state of each part of a rubber blade when a conventional wiper blade performs a wiping motion.
FIG. 4 is a cross-sectional view sequentially illustrating a deformation process of a rubber blade that generates noise by contacting a pressure spring when a conventional wiper blade performs a wiping motion under pressure.
5 is a detailed cross-sectional view of a rubber blade and a pressure spring according to an embodiment of the present invention.
Figure 6 is a detailed cross-sectional view of the lower fixing portion formed downward at the same angle left and right according to an embodiment of the present invention.
7 is a cross-sectional view sequentially showing the process of deformation and contact of a rubber blade to reduce noise by contacting a pressure spring step by step when a wiper blade performs a wiping motion under pressure according to an embodiment of the present invention.
8 is a cross-sectional view showing in detail a contact process of a lower fixing part of a rubber blade that contacts a pressure spring step by step when a wiper blade performs a wiping motion under pressure according to an embodiment of the present invention.
9 is a detailed cross-sectional view of the lower fixing part of the rubber blade according to another embodiment of the present invention, both sides of which are formed at different angles around the center.
10 is a detailed cross-sectional view of a rubber blade and a pressure spring in a wiper blade having two or more wiping parts of the wiper blade 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.

1 is a structure of a general wiper blade, wherein a connector 10 connected to a wiper arm (not shown) of a vehicle supports a pressure spring 20, and the pressure spring 20 supports a rubber blade 30 At the same time, it serves to distribute the pressure in the longitudinal direction, and the rubber blade 30 serves to wipe the glass surface (G).

Looking at the structure of the rubber blade 30 in more detail in a state in which the wiper blade of the related art is not subjected to pressure and does not perform a wiping motion in FIG. 2, the rubber blade 30 places the pressure spring 20 to The upper fixing part 32 and the lower fixing part 33, which receive pressure and form support at the same time, are located in contact with the upper and lower ends of the pressure spring 20, respectively, and the central part 31 of the rubber blade 30 It serves to position the rubber blade 30 in the center of the pressure spring 20 in the longitudinal direction.

In general, in order to secure the wipeability of the wiper blade, the pressure spring 20 and the rubber blade 30 must be able to move flexibly in the longitudinal direction. For this purpose, the central part 31 in direct contact with the pressure spring 20 And the upper fixing part 32 and the lower fixing part 33 come into contact with the pressure spring 20 with a certain gap, and the amount of the gap is maintained at about 0.1 mm to 0.3 mm.

In addition, a bent part 34 is located at the center of the rubber blade 30, and a wiping part 35 for wiping the glass surface is located at the lower end of the bent part 34, and a pendulum in the wiping process is located on the upper part of the wiping part 35. A left stop 36 and a right stop 37 are located to keep the bending angle constant during exercise.

As shown in FIG. 3, the wiper blade actually installed and in use is located on the glass surface of the vehicle in a state of being constantly pressured by a wiper arm (not shown), so that the rubber blade 30 is the pressure spring 20 ), the wiping portion 35 in contact with the glass surface receives a force in the opposite direction to the forward direction due to frictional force, and is formed the thinnest in the rubber blade 30 As it rotates in the rearward direction around the bent portion 34 in contact with the glass surface, the rotation angle of the wiping portion 35 is generally composed of 20 ° to 35 °.

In addition, as shown in FIG. 3, when the rubber blade 30 advances in the lateral direction, a force is generated in the opposite direction to the forward movement due to the frictional force of the wiping portion 35, and the rubber blade located at the center of the pressure spring 20 Rotational force centered on the center 31 of 30 is also generated, so that the lower fixing part 33 on the opposite side of the forward direction comes into close contact with the lower end of the pressure spring 20, and the opposite lower fixing part 33 A gap with the pressure spring 20 is created as much as the angle rotated in the center 31. In general, the rotation angle in the central part 31 of the lower fixing part 33 is composed of 2 ° to 5 °.

FIG. 4 shows in detail the reverse contact impact noise between the rubber blade 30 and the pressure spring 20, which is the main cause of generating reverse noise in the conventional wiper blade.

Number 1 of FIG. 4 shows a state just before reversal where the rubber blade 30 coming to the left is inverted to the right and just before moving forward, and each portion of the rubber blade 30 when it comes to the left remains unchanged. When reversal starts, the wiper arm performs a wiping motion at a constant speed in the entire section, and a speed change in the opposite direction at the same speed causes a rapid change from + direction (etc) speed to - direction (etc) speed.

As the rubber blade 30 coming to the left starts to advance in the opposite direction, as shown in No. 2 in FIG. It rotates around the center, and as in No. 3, the left stop 36 of the wiper 35 applies a rotational impact while contacting the rubber blade 30, and at the same time, the lower fixing part 33 that was open at No. 3 As in No. 4, the impact is applied while contacting the lower end of the pressure spring 20, so that reversal noise is generated.

The impact applied by the left stopper 36 of the wiping part 35 is an impact that the rubber material applies to the rubber material, and generally, the contact of the left stopper 36 is a line contact, so the noise is insignificant, but the rubber When the lower fixing part 33 of the material applies an impact to the lower end of the pressure spring 20 made of an elastic steel plate, a large amount of noise is generated. In particular, if the entire surface of the lower fixing part 33 applies an impact to the pressure spring 20 and even water remains inside, the noise becomes even greater.

5 is a wiper blade according to an embodiment of the present invention in order to solve this problem, the inside of the lower fixing part 33 where the contact between the rubber blade 30 and the pressure spring 20 is made is located at the bottom of the center 31 And from the point where the lower part of the center 31 and the lower fixing part 33 meet, the outer end is positioned 2 ° to 15 ° downward to form a structure formed in a curved line connected.

6 shows that the inside of the lower fixing part 33 in contact with the pressure spring 20 in the rubber blade 30 of the wiper blade according to an embodiment of the present invention is located at the bottom of the center 31 and the outside shows a curve connected by placing it 5° downward from the point where the lower part of the center 31 and the lower fixing part 33 meet.

7 is a contact shock mitigation process between the lower fixing part 33 of the rubber blade 30 and the pressure spring 20, which is the main action of reducing reverse noise in the wiper blade according to an embodiment of the present invention. are shown in detail.

In No. 1 of FIG. 7, when the rubber blade 30, which has come to the left, starts moving forward to the right, the deformation of the rubber blade 30 still maintains the state formed while coming to the left.

As the rubber blade 30 coming to the left starts to advance in the opposite direction, as shown in number 2 in FIG. As in the case, the left stop 36 of the wiping part 35 applies rotational force while contacting the rubber blade 30, so that the lower fixing part 33, which was open at the same time, is lowered as shown in No. 4 in FIG. From the inner curve of the top 33, the lower end of the pressure spring 20 is gently brought into contact as if pushing water, and the line contact by the meeting process of the curve and the straight line is continued until the rotation is completed as shown in No. 5 in FIG. It is a structure that alleviates the impact while doing so, and as a result, reduces the reverse noise along with the reverse shock.

FIG. 8 shows processes 3, 4, and 5 of FIG. 7, which are the main processes for reducing reversal noise in a wiper blade according to an embodiment of the present invention, superimposed on one drawing, and the rubber blade A structure in which the curve of the lower fixing part (33) of (30) makes smooth line contact with the straight surface of the pressure spring (20), and through this structure, the contact shock is mitigated and the reverse noise is reduced. Wiper structure it's a blade

9 is a wiper blade according to another embodiment of the present invention, the lower fixing part 33 of one side of the central part 31 of the rubber blade 30 is positioned with a curve formed downward at an angle of 5 °, On the other hand, the lower fixing part 33 on the opposite side of the central part 31 is presented as a structure in which the lower fixing part 33 on both sides forms curves with different angles by locating a curve formed in a downward direction at an angle of 10 °. , Even if it is not symmetrical, the effect of the present invention can be seen as the same curved structure in which the lower fixing part 33 in which surface contact with the pressure spring 20 occurs goes down toward the outside.

10 is a rubber blade 30 having two wiping parts 35 of a wiper blade according to another embodiment of the present invention, and the lower fixing part 33 having surface contact with the pressure spring 20 ) is the same curved structure that goes down as it goes outward, and the effect of the present invention can be seen 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: connector
20: pressure spring
30: rubber blade
31: center
32: upper fixing part
33: lower fixing part
34: bent part
35: wiping unit
36: left stop
37: right stop

Claims (1)

A wiper blade for a vehicle, in which a pressure spring located at a connector connected to a wiper arm transmits pressure while supporting it in a longitudinal direction, wherein the pressure spring is located on the left and right upper fixing parts and lower parts of the central part located on the rubber blade Located between the fixing parts, the inside of the lower fixing part is connected to the center, and the outside of the lower fixing part is 1° to 15° from the inside to the outside at the point where the lower fixing part and the center meet. Wiper blade comprising a rubber blade formed in a downward direction at an angle between the lower fixing portion and a downward curve from the inside to the outside.

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