Rubber blade for absorbing reverse shock to minimize reverse noise of wiper blade

Abstract

The present invention relates to a rubber blade to minimize reverse shock of a wiper blade, which is positioned on a frame of a wiper blade for a vehicle and receives a wiping motion force of a wiper arm to wipe a glass surface, the rubber blade being characterized in that a wiping rotation portion is provided in a wiping portion of the rubber blade in which a bent portion is positioned between the wiping portion and a fixing portion, so that in a reverse wiping motion of the rubber blade, first bending of the bent portion proceeds, and second bending of the bent portion proceeds in a state in which the wiping rotation portion is in contact with the bent portion or a fixing rotation portion of the fixing portion, thereby minimizing a reverse impact between the wiping portion and the fixing portion, while the optimal wiping angle between a wiping blade of the wiping portion and the glass surface can be appropriately maintained through the elasticity of the bent portion.

Description

Reverse shock-absorbing rubber blade to minimize reverse noise of wiper blades

[0001] The present invention relates to a rubber blade positioned on a vehicle wiper blade that receives the wiping motion of a wiper arm to wipe a glass surface, and more specifically, to a rubber blade configured to minimize and absorb the reversal shock transmitted to the glass surface through the wiping edge of the rubber blade during the reverse wiping motion while the wiper blade is wiping, thereby alleviating reversal noise, while maintaining the optimal wiping angle to have the best wiping performance.

[0002] In general, a vehicle is equipped with a wiper device to remove snow, rain, foreign substances, etc. present on the surface of the glass. This device is a device that wipes the glass surface with a wiper blade (10) attached to a wiper arm (not shown) that performs a wiping motion by a wiper motor, thereby performing the function of securing the driver's field of vision.

[0003] A typical conventional wiper blade (10) is composed of a wiper frame (11) connected to a wiper arm (not shown) as shown in Fig. 1 and a rubber blade (20) supported by the wiper frame (11), and is structured such that the wiper frame (11) distributes and transmits the wiping force of the wiper arm (not shown), which is the combined pressure of the wiper arm (not shown) and the wiping force provided by the wiper motor, over the entire length of the rubber blade (20) to wipe the glass surface.

[0004] The rubber blade (20) has various forms, but there are two representative forms of the rubber blade (20) of the general prior art. In a natural state where it does not perform a wiping operation, it has a structure like A and B of the cross-sectional view of Fig. 2. Looking at this in detail, it is configured by a fixed part (30) that is fixed to the wiper frame (11), a wiping part (50) that performs wiping, and a bending part (40) that connects the two parts and performs a bending rotation as a center of the wiping bending rotation movement between the fixed part (30) and the wiping part (50), and the cross-section configured in this way is extended to the entire length to form the rubber blade (20).

[0005] In general, the rubber blade (20) applied to the wiper blade (10) is manufactured with an elastic material that is easy to deform, and the manufactured rubber blade (20) can be said to be in a natural state without deformation as shown in FIG. 2 if no external force is applied. In general, design and manufacturing are performed based on the shape of the rubber blade (20) in a natural state. However, since the pressure of the wiper arm (not shown) is constantly applied to the general wiper blade (10) that is actually installed and operated on a vehicle, the wiper blade (10), which is always under pressure even when wiping, when stopped, and when the vehicle is stationary, is in close contact with the glass surface (70) of the vehicle, and therefore, the rubber blade (20) is deformed and positioned in a certain shape that performs the wiping operation as shown in FIG. 3, and this can be said to be a wiping state. In reality, the general rubber blade (20) is always operating or stopping in the wiping state.

[0006] The detailed cross-sectional structure and shape of a typical conventional rubber blade (20) when wiping a glass surface (70) in a wiping state is shown in the cross-sectional view of Fig. 3. As shown in the cross-section of the wiping state in FIG. 3, the wiping blade (54) of the wiping contact portion (53) of the pressure-applied wiping portion (50) and the glass surface (70) are in contact and positioned, and when the rubber blade (20) moves in the wiping direction by receiving the wiping force, the wiping blade (54) comes into contact with the glass surface (70) and is in close contact with the glass surface (70) due to the wiping friction force generated between the glass surface (70) and the wiping blade (54), and the wiping portion (50) is rotated around the center point (41) of the bending portion (40) to rotate in the opposite direction of the wiping direction, so that the stop portion (26) comes into contact with the fixed surface (25), and the wiping portion (50) maintains its deformed shape in a state where it is bent by the designed angle, and the entire rubber blade (20) moves in the wiping direction. At this time, the wiping contact portion (53) is subjected to pressure and undergoes slight deformation, The wiping blade (54) comes into contact with the glass surface (70) with an appropriate pressure, and performs wiping while appropriately maintaining the wiping angle, which is the angle formed by the side of the wiping contact portion (53) and the glass surface (70).

[0007] Generally, when the wiper blade (10) performs a wiping motion to wipe the glass surface (70) from the front of the vehicle, it is structured to perform a reciprocating rotational motion within the wiping area of ​​the glass surface (70) as shown in Fig. 4. In the process of performing this reciprocating rotational motion, the wiper blade (10), which performs wiping in one direction, performs a reverse wiping motion in which it reverses when it reaches the reversal area, and then continues the reciprocating wiping motion in which it wipes in the opposite direction, thereby removing water and dirt from the glass surface (70).

[0008] In the reversal zones located at both ends of the wiping zone of Fig. 4, the wiper blade (10) moves in one direction and then performs a reverse wiping motion, generally maintaining the same speed but moving in the opposite direction. The operating state of the rubber blade (20) in this reverse wiping motion situation of the reversal zone and the process of transmitting an impact to the glass surface (70) are illustrated in the cross-sectional views of Fig. 5.

[0009] As shown in the cross-sectional view in (a) of Fig. 5, the wiping part (50) in contact with the glass surface (70) rotates in the opposite direction of the wiping direction while the bending rotation occurs around the bending center point (41) at the bending part (40), so that the stop part (26) comes into contact with the fixed surface (25) and the wiping part (50) maintains the form of rotating by the designed angle, and the entire rubber blade (20) moves in the wiping direction until it reaches the reverse zone located at the end of the wiping zone, so that a reverse wiping movement is performed in which only the forward direction is reversed while maintaining the same speed as in (b) of Fig. 5, and the wiping blade (54) of the wiping contact part (53) is fixed to the glass surface (70) by the wiping frictional force, and only the fixed part (30) is connected and fixed to the wiper frame (11) and starts to move forward in the opposite direction.

[0010] Since the wiping blade (54) is fixed to the glass surface (70) by the wiping friction force, only the fixed part (30) moves forward in the opposite direction, so that the wiping part (50) rotates in the opposite direction around the center point (41) of the bending part (40), so that the bending part (40) is temporarily unfolded and then bent in the opposite direction, and as shown in (d) of FIG. 5, the wiping part (50) rotates in the opposite direction of the reverse wiping progress movement around the center point (41) of the bending part (40), so that the opposite stop part (26) of the wiping part (50) comes into contact with the opposite fixed surface (25) of the fixed part (30).

[0011] At this time, the fixed part (30) in (c) of Fig. 5 rises upward to the highest position and lifts the wiper arm (not shown), and as the reverse wiping progresses, the fixed part (30) that was raised upward, as shown in (d) of Fig. 5, quickly descends again toward the glass surface (70) and applies a reverse pressure higher than the wiper arm pressure during the wiping process in the downward direction. Meanwhile, during the reverse wiping movement in which the reverse wiping force is applied, the wiping blade (54) is only fixedly rotated by the wiping friction force with the glass surface (70), and a rotational force is generated to rotate the stationary part (26) of the wiping part (50) around the center of the bending point (41) of the bending part (40), and the rotational force of the stationary part (26) in the opposite direction of the reverse pressure force around the center of the bending point (41) applies an impact to the fixed surface (25). At this time, the reverse pressure force and the rotational force collide in opposite directions, thereby generating an amplified reverse impact.

[0012] Therefore, as shown in (d) of FIG. 5, the impact force of the entire generated reverse shock is a double impact in which the rotational force and the reverse pressure force due to the reaction force of the forward force are added, and the amplified reverse shock, which is the combined pressure and rotational force that come down as the stopper (26) impacts the fixed surface (25), acts in a direction approximately perpendicular to the glass surface (70), as shown in FIG. 5 (d), and is directly transmitted to the glass surface (70) through the wiping blade (54) of the wiping contact portion (53) located in the direction of transmission of the reverse shock, so that an impact occurs on the glass surface (70) over the entire length of the rubber blade (20), and a loud reverse noise of the wiper blade (10) is generated.

[0013] Looking at this more specifically, as shown in A and B of Fig. 6, the angle formed by the straight line connecting the stop part (26) of the wiping part (50) of the rubber blade (20) of the general prior art and the center line (60) is formed to be approximately close to 90 degrees, and the rotational force acting in the 90 degree direction of this straight line acts in the upward direction of approximately 90 degrees. In addition, the angle formed by the straight line connecting the point of the fixed surface (25) where the stop part (26) of the wiper part (50) of the prior art rotates and comes into contact with the center point (41) of the bending is also formed to be approximately 90 degrees, so that the rotational force applied when the stop part (26) of the wiper part (50) rotates and bends is applied to the fixed surface (25) in a 90 degree direction when in contact, and this creates an effect of colliding with each other in a 180 degree direction with respect to the pressure applied in the vertical direction to the glass surface (60), which is the direction in which the pressure of the wiper arm (not shown) is applied.

[0014] Therefore, the angle formed by these two straight lines and the center line is an important variable that generates the reversal shock of the bending rotation. To put it simply, as shown in A and B of FIG. 6, the closer the angles a and b, which are the angles between the bisector between the two straight lines and the center line (60), are to 90 degrees, the greater the reversal shock of the bending rotation. Since the rubber blades of the prior art are all formed at positions close to approximately 90 degrees, the reversal shock is large and the resulting reversal noise is also large.

[0015] The present invention is designed to solve the above problems, and the purpose of the present invention is to provide a rubber blade that minimizes the reverse shock generated between the fixed part and the wiping part during the reverse wiping movement of the wiper blade, thereby reducing the shock transmitted to the glass surface through the wiping blade, while at the same time maintaining the optimal wiping angle between the wiping blade and the glass surface, thereby reducing the reverse noise and ensuring sufficient wiping performance.

[0016] In order to achieve the above object, according to an embodiment of the present invention, when the bending part makes the first bending in the reverse wiping motion of the rubber blade, the wiping part starts to come into contact with the bending part, and when the bending rotation continues and the second bending of the bending part makes progress, the wiping part continues to contact the bending part and decelerates, and when the wiping part comes into contact with the fixed part, a rubber blade is provided which is formed to minimize the reverse shock between the wiping part and the fixed part, and to optimize the wiping angle of the wiping blade of the wiping part and the glass surface through the elasticity of the bending part.

[0017] Accordingly, according to the rubber blade of the present invention, the reverse shock occurring during the reverse wiping movement is minimized, and the reverse noise occurring between the wiping blade and the glass surface is reduced, and the rubber blade is configured so that the wiping blade and the glass surface are always wiped at an optimal angle, thereby providing a wiper blade that is quieter while having the same wiping performance.

[0018] Figure 1 is a perspective view showing the structure of a typical wiper blade.

[0019] Fig. 2 is a cross-sectional view showing the structure of a rubber blade of the prior art.

[0020] Fig. 3 is a cross-sectional view showing a structure in which a conventional rubber blade performs wiping.

[0021] Figure 4 is a drawing showing the reciprocating rotational wiping motion and the reverse wiping motion position within the wiping area of ​​the glass surface.

[0022] Figure 5 is a cross-sectional view showing the process of generating reverse impact and resulting reverse noise on a glass surface when a conventional rubber blade performs a reverse wiping motion while wiping the glass surface.

[0023] Figure 6 is a cross-sectional view showing the direction of the impact and the rotational force depending on the angle generated when a rubber blade of the prior art performs a wiping motion on a glass surface.

[0024] Figure 7 is a cross-sectional view showing the structure of the rubber blade of the first embodiment of the present invention in its natural state.

[0025] Figure 8 is a cross-sectional view showing the structure of the first bending wiping state in which the wiping movement of the rubber blade of the first embodiment of the present invention begins.

[0026] Figure 9 is a cross-sectional view showing a structure that minimizes the reversal shock in the secondary bending wiping state of the rubber blade of the first embodiment of the present invention.

[0027] Figure 10 is a cross-sectional view showing a structure in which a rubber blade of the first embodiment of the present invention minimizes a reversal shock and stops a bending rotation in a second bending wiping state.

[0028] FIG. 11 is a cross-sectional view showing a structure in which the wiping part is changed to an optimal angle through each pressure and reversal shock change state and elasticity that are changed in each process in which the reversal in the wiping state of the rubber blade of the first embodiment of the present invention is performed.

[0029] Figure 12 is a cross-sectional view showing a rubber blade of a second embodiment of the present invention.

[0030] Fig. 13 is a cross-sectional view showing the structure of a rubber blade of the third embodiment of the present invention in its natural state.

[0031] Figure 14 is a cross-sectional view showing each structural change process during the reverse wiping movement of the rubber blade of the third embodiment of the present invention.

[0032] Fig. 15 is a cross-sectional view showing the structure of the first bending wiping state in which the wiping movement of the rubber blade of the third embodiment of the present invention begins.

[0033] Fig. 16 is a cross-sectional view showing a structure that minimizes the reversal shock in the secondary bending wiping state of the rubber blade of the third embodiment of the present invention.

[0034] Fig. 17 is a cross-sectional view showing a structure in which a rubber blade of the third embodiment of the present invention absorbs a reversal shock in a wiping state and stops the bending rotation.

[0035] Fig. 18 is a cross-sectional view showing a structure in which a rubber blade of the third embodiment of the present invention absorbs a reverse shock in a wiping state and then returns to an appropriate wiping angle when wiping is performed.

[0036] Fig. 19 is a cross-sectional view showing the structure of a rubber blade of the fourth embodiment of the present invention in its natural state.

[0037] Figure 20 is a cross-sectional view showing the structure of the first bending wiping state in which the wiping movement of the rubber blade of the fourth embodiment of the present invention begins.

[0038] Figure 21 is a cross-sectional view showing the structure of the impact of the rubber blade of the fourth embodiment of the present invention and the direction of rotational force according to the angle.

[0039] Figure 22 is a cross-sectional view showing a structure in which a rubber blade of the fourth embodiment of the present invention minimizes reverse shock and stops bending rotation in a wiping state.

[0040] Figure 23 is a cross-sectional view showing a rubber blade of the fifth embodiment of the present invention.

[0041] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0042] In the embodiments of the present invention, the rubber blade (20) is manufactured by press molding with a mold or by an extrusion process using a flexible and elastic material (natural rubber, synthetic rubber, EPDM, TPE, silicone, etc.), so that the wiping part (50) and the bending part (40) maintain elasticity in the wiping direction to enable a reverse wiping movement, and are made of a material and structure that flexibly adheres to the curvature of the glass surface (70) over the entire length to distribute and transmit the wiping movement force of the wiper arm (not shown) through the wiper frame (11) to wipe the glass surface (70).

[0043] <First Embodiment>

[0044] The following is a detailed description of the process of minimizing the reverse shock of the bending rotation in the wiping motion and the reverse wiping motion of the rubber blade (20) according to the first embodiment of the present invention, starting from the natural state of Fig. 7 and progressing to the wiping state in Figs. 8, 9, and 10.

[0045] As shown in Fig. 7, the rubber blade (20) according to the first embodiment of the present invention has a structure that minimizes the reverse shock and maintains the optimal wiping angle. Looking at the structure in its natural state, a bending part (40) that performs bending is positioned between a fixed part (30) that is combined with a wiper frame (11) to distribute and transmit wiping force and a wiping part (50) that performs wiping.

[0046] The bending portion (40) is formed with a size of the thickness T of the smallest part and the length L of the part where the bending occurs, and the upper end is connected to the fixed rotation portion (31) of the fixed portion (30) and the lower end is connected to the wiping support portion (56) of the wiping portion (50).

[0047] A fixed rotation part (31) formed by being connected to the upper part of the bending part (40) is located on the fixed part (30), and a fixed reduction surface (32) formed by being connected to the outside of the fixed rotation part (31) is located on the bottom of the fixed part (30). A fixed stop part (33) formed by being connected to the fixed reduction surface (32) is located on the outside of the fixed reduction surface (32).

[0048] The wiping part (50) is provided with a wiping support part (56) that is formed convexly outwardly and connected to the lower end of the bending part (40), so that the lower end of the bending part (40) is positioned lower than the upper end of the wiping part (50), and the wiping support part (56) is formed in a shape that surrounds the bending part (40). At the upper end of the wiping support part (56), a wiping rotation part (51) formed in the direction of the bending part (40) is positioned, and a wiping reduction surface (55) formed in an outward direction from the wiping rotation part (51) is positioned at the upper end of the wiping part (50). At the outer end of the wiping reduction surface (55), a wiping stop part (52) formed in connection with the wiping reduction surface (55) is positioned.

[0049] At the lower end of the wiping part (50), a wiping contact part (53) is formed and positioned downward, and at the lower end of the wiping contact part (53), a wiping blade (54) is positioned in contact with the glass surface (70).

[0050] All of the components formed in this way are configured to be approximately symmetrical left and right with the center line (60) as the center to form the cross section of the rubber blade (20), and when the cross section formed in this way is formed to be long in the longitudinal direction, a completed rubber blade (20) as shown in Fig. 1 is formed.

[0051] As shown in the cross-sectional view in FIG. 8, when the wiping state in which the rubber blade (20) according to the first embodiment of the present invention starts the reverse wiping movement is observed, the pressured wiping blade (54) comes into contact with the glass surface (70) and is fixed in a position by the wiping frictional force, and when the fixed part (30) of the rubber blade (20) begins to move in the wiping progress direction by receiving the wiping progress force, the wiping part (50) rotates around the wiping blade (54), and when the bending part (40) bends and the wiping part (50) bends and rotates in the opposite direction to the wiping progress direction, the bending part (40) bends and the wiping rotation part (51) of the wiping part (50) moves in the direction of the bending part (40) and comes into contact and close contact.

[0052] The bending of this bending portion (40) is performed by bending in the opposite direction of the wiping direction by creating a curvature centered on the part T with the smallest thickness of the bending portion (40) or by bending the entire length L of the bending portion (40). The amount of bending of this bending can be determined by adjusting the distance from the wiping rotation portion (51) of the wiping portion (50) to the bending portion (40) and the length from the top to the bottom of the bending portion (40), and this can be called the first bending.

[0053] For the purpose of minimizing the reversal shock, the smaller the bending amount of the first bend, the better, but considering the structure, elasticity and strength of the rubber blade (20), manufacturing method, etc., the distance from the wiping rotation part (51) of the wiping part (50) to the bending part (40) can be appropriately adjusted to form. In general, the bending amount of the first bend, the rotation angle a of degree 8, can be determined between 5 and 30 degrees.

[0054] At this time, when the wiping part (50) rotates by a rotation angle a around the center line (60), the bending part (40) also moves by a rotation angle a, and then the wiping rotation part (51) of the wiping part (50) comes into contact with the bending part (40), and the wiping contact part (53) of the wiping part (50) tilts by a wiping angle a' corresponding to the rotation angle a with respect to the glass surface (70) with the wiping blade (54) as the center, and moves in the wiping direction to start wiping.

[0055] As shown in the cross-sectional view in FIG. 9, when the wiping motion of the rubber blade (20) according to the first embodiment of the present invention is in progress and the bending rotation of the wiping part (50) is additionally performed, the wiping part (50) undergoes additional rotation around the wiping blade (54) as the wiping motion started in FIG. 8 is additionally performed, and accordingly, the bending part (40) undergoes additional bending. Since the wiping rotation part (51) of the wiping part (50) is in close contact with the bending part (40) in FIG. 8, the additional bending of the bending part (40) occurs at the part where the wiping rotation part (51) is in contact with the bending part (40).

[0056] This bending is not performed in the opposite direction of the wiping direction at the bending portion (40) as shown in FIG. 8, but rather, the wiping rotation portion (51) of the wiping portion (50) is in contact with the bending portion (40) and is stopped, so that the bending portion (40), which is made of a flexible and elastic material, bends and undergoes elastic deformation in the downward direction at the contact portion of the wiping rotation portion (51) of the wiping portion (50), thereby increasing the length of the bending portion (40), and accordingly, the wiping portion (50) rotates around the wiping rotation portion (51), and this bending progresses in such a way that it rotates around the wiping rotation portion (51). This can be called a secondary bending.

[0057] At this time, when the wiping part (50) rotates by a rotation angle b in the opposite direction to the wiping progress, the bending part (40) is in close contact with the wiping rotation part (51) of the wiping part (50), so that the bending part (40) is bent a second time around the wiping rotation part (51), so that the wiping reduction surface (55) of the wiping part (50) comes into contact with the fixed reduction surface (32) of the fixed part (30), and the bending part (40), which is a flexible and elastic material, undergoes elastic deformation in which its length increases in the downward direction through the second bending, and as contact occurs between the wiping reduction surface (55) and the fixed reduction surface (32), the rotation progresses to a rotation angle b, and the wiping angle b' is formed corresponding to the rotation angle b.

[0058] In Fig. 9, the bending portion (40) undergoes elastic deformation in the downward direction during the second bending, while at the same time, an elastic force pulling upward is generated. This elastic force acts to minimize the reversal shock. In order to minimize the reversal shock, the greater the elasticity of the second bending, the better, but it must be adjusted to suit the wiping performance and the required wiping angle, etc. Therefore, the elasticity can be determined by appropriately adjusting the thickness T and length L of the bending portion (40) illustrated in Fig. 7 by considering the structure, elasticity and strength of the rubber blade (20), manufacturing method, etc. In general, the ratio of T: L is determined to be approximately 1:1.5 to 1:5. The thickness T and length L of the bending portion (40) are deformed so that the thickness T' decreases and the length L' increases, as shown in Fig. 9.

[0059] As shown in the cross-sectional view in FIG. 10, when the wiping state of the rubber blade (20) in which the bending rotation of the wiping part (50) according to the first embodiment of the present invention is completed, as wiping progresses, the wiping part (50) rotates additionally with respect to the wiping blade (54) as a center compared to FIG. 9, and accordingly, the bending part (40) undergoes additional bending. Since the wiping rotation part (51) of the wiping part (50) is in close contact with the bending part (40), an additional secondary bending of the bending part (40) occurs with respect to the wiping rotation part (51).

[0060] At this time, when the wiping part (50) rotates by a rotation angle d in the opposite direction of the wiping progress, since the bending part (40) is in close contact with the wiping rotation part (51) of the wiping part (50), the bending part (40) is bent a second time around the wiping rotation part (51), so that the wiping reduction surface (55) of the wiping part (50) continues to contact the fixed reduction surface (32) of the fixed part (30), and the bending part (40), which is a flexible and elastic material, undergoes elastic deformation through the second bending so that the length thereof increases further in the downward direction, and due to the elastic force of the bending part (40), the reversal shock at the contact between the wiping reduction surface (55) and the fixed reduction surface (32) is minimized, and the bending rotation of the wiping part (50) progresses up to the rotation angle d, and the wiping angle d' is formed corresponding to the rotation angle d.

[0061] In Fig. 10, as in Fig. 9, the bending portion (40) undergoes additional elastic deformation in the downward direction during the second bending, and the elastic force pulling upward increases. This increased elastic force acts to minimize the reversal shock, and when the elastic force of the bending portion (40) and the rotational force of the wiping portion (50) that occurs at this time are balanced, the bending rotation of the wiping portion (50) stops at the rotation angle d.

[0062] At this time, the value of the rotation angle d can be adjusted by adjusting the shape and curvature of the wiping reduction surface (55) and the shape and inclination of the fixed reduction surface (32), and accordingly, the wiping angle d' corresponding to the rotation angle d can also be adjusted.

[0063] In addition, the rotation angle d at which the bending rotation of the wiping part (50) stops must be appropriately configured through the balance of elasticity and rotational force as above, but if the pressure of the wiper arm (not shown) is too high or the wiping force is too strong, the rotation angle d becomes too large, and the side of the wiping part (50) comes into contact with the glass surface (60), which causes the wiping performance to deteriorate and causes an additional reverse shock to occur.

[0064] To prevent this, a fixed stop part (33) is formed and positioned on the fixed part (30), and a wiping stop part (52) is formed and positioned on the wiping part (50), so that the bending rotation of the wiping part (50) can be stopped either alone or through interaction. At this time, the shape and size of the fixed stop part (33) and the shape and size of the wiping stop part (52) are appropriately adjusted to stop the bending rotation of the wiping part (50), thereby preventing the rotation angle d from becoming too large.

[0065] The rotation angle d at which the bending rotation of the wiper (50) stops is generally determined between 40 and 55 degrees.

[0066] However, in general, the appropriate wiping angle formed by the wiping contact part (53) of the rubber blade (20) and the wiping edge (54) and the glass surface (70) to ensure the best wiping performance is set to be larger than the wiping angle d' of Fig. 10, but in order to sufficiently achieve the purpose of minimizing the reverse shock, the rotation angle d of Fig. 10 is formed to be large, and the wiping angle d' is made smaller than the optimal wiping angle.

[0067] Therefore, in order to secure the best wiping performance, it is necessary for the wiping part (50) to perform the wiping movement in the wiping area while maintaining the angle at a wiping angle c' smaller than the wiping angle d' at which the bending rotation of the wiping reverse movement stops. The structure for minimizing the reverse shock and maintaining the optimal wiping angle for this purpose is illustrated and described in 8) of FIG. 11.

[0068] As shown in FIGS. 8, 9 and 10, in the bending rotation of the wiping part (50) according to the embodiment of the present invention, the elastic force due to the elastic deformation of the bending part (40) increasing from the rotation angle a of FIG. 8 to the rotation angle d of FIG. 10, and the contact between the wiping reduction surface (55) of the wiping part (50) and the fixed reduction surface (32) of the fixed part (30) minimizes the reversal shock.

[0069] However, the bending rotational movement of the wiper part (50) that progresses from the natural state of Fig. 7 to the wiping state in Figs. 8, 9 and 10 is different from the wiping movement of the wiper arm (not shown) and wiper blade (10) that are actually installed and operated in a vehicle.

[0070] The wiping movement of an actual vehicle is performed in a constant wiping state in the manner of “stop in wiping state -> reverse -> wiping in progress -> reverse -> wiping in progress -> reverse -> wiping in progress -> stop in wiping state” by the rubber blade (20). Therefore, the process of minimizing the reversal shock of the bending rotation of the rubber blade (20) in the embodiment of the present invention due to the wiping movement in an actual vehicle and the structure of maintaining the optimal angle are described in detail in FIG. 11 as follows.

[0071] Figure 11 shows in detail the process in which a rubber blade (20) according to the first embodiment of the present invention is reversed and rotated in accordance with the wiping movement of a wiper blade (10) operated in an actual vehicle, and the sequential progress of the pressure applied from a wiper arm (not shown) and the change in the reverse shock.

[0072] In 1) of Fig. 11, the rubber blade (20) moves with a wiping force F1' while the pressure F2 of the wiper arm (not shown) continues to act, and then starts a reverse wiping movement with a wiping force F1 through a reversal in which only the direction of movement is reversed at the same speed, and as in 2) of Fig. 11, as the reverse bending rotation of the wiping part (50) begins, the elastic force F0 generated by the elastic deformation of the bending part (40) in which the bending is reduced gradually decreases, and the rotation angle of the wiping part (50) also decreases.

[0073] As in 3) of Fig. 11, when the rubber blade (20) is moved by the wiping force F1, the wiping blade (54) is in close contact with the glass surface (70) by the wiping friction force, and the wiping part (50) is rotated in the opposite direction to the wiping direction, so that the height of the rubber blade (20) increases and the wiper arm (not shown) is pushed up by the force F3, so that the rubber blade (20) becomes close to its natural state as in 4) of Fig. 11.

[0074] As shown in 5) of Fig. 11, when the wiping progress continues with the wiping progress force F1, the wiping blade (54) is in close contact with the glass surface (70) due to the wiping friction force, and the wiping part (50) begins to rotate in a direction opposite to the wiping progress direction. At this time, in addition to the pressure F2 of the wiper arm (not shown), the impact load of the rising and falling impact force, the counter pressure F4, is applied to the rubber blade (20), and the wiping part (50) rotates, generating a rotational force F5, and the wiping rotation part (51) of the wiping part (50) comes into contact with the bending part (40), causing a first bending, and the wiping rotation part (51) of the wiping part (50) comes into contact with the bending part (40), and the pressure F6 generated by the rotational force of F5 applies pressure to the bending part (40) through the wiping rotation part (51) of the wiping part (50).

[0075] At this time, a phenomenon different from the prior art occurs, as shown in Fig. 5 (c)(d). In the prior art, as shown in Fig. 5 (c), the height increases and then decreases rapidly as shown in Fig. 5 (d) due to the pressure of the wiper arm (not shown), and at the same time, the rotational force of the stationary part (26) of the wiper part (50) rotating around the center of the bend (41) moves in opposite directions and collides with each other at one point, resulting in a large reverse shock.

[0076] On the other hand, in the case of the rubber blade (20) according to the embodiment of the present invention as illustrated in 5) of FIG. 11, when the wiping rotation part (51) of the wiping part (50) comes into contact with the bending part (40), the direction of the pressure of F6 generated by the wiping progress force and the direction of the counter pressure F4 do not face each other at one point, but meet at an angle close to approximately 90 degrees, so that the impact is not as great as in the prior art, and when the wiping rotation part (51) of the wiping part (50) comes into contact with the bending part (40), the bending part (40) undergoes elastic deformation at the same time to absorb the contact pressure of F6, so that the counter shock also acts small, and the counter shock becomes very small compared to the prior art, and as a result, the impact transmitted by the wiping blade (54) to the glass surface (70) also acts very small.

[0077] As shown in 6) of Fig. 11, when the reverse pressure F4 is applied to the rubber blade (20) and the wiping progress continues by the wiping progress force F1, the wiping rotation part (51) of the wiping part (50) continues to contact the bending part (40) and the additional bending rotation of the wiping part (50) progresses, so that the lower part of the bending part (40) is fixed to the wiping part (50) and the upper part is in contact with the wiping rotation part (31), and while the contact between the bending part (40) and the wiping rotation part (51) is maintained, a secondary bending occurs in which elastic deformation occurs in the longitudinal direction.

[0078] At this time, the rotational force generated as the wiping part (50) rotates is distributed into a force F6 that maintains the wiping rotation part (51) of the wiping part (50) in contact with the bending part (40) and a rotational force F5 that rotates the wiping part (50) around the wiping rotation part (51), and an elastic force F0 is generated as a reaction force against the elastic deformation in the longitudinal direction as the bending part (40) maintains contact with the wiping rotation part (51) due to the secondary bending.

[0079] By the rotational force F5, the wiping reduction surface (55) of the wiping part (50) comes into contact with the fixed reduction surface (32) of the fixed part (30), but as the wiping reduction surface (55) moves from 4) of FIG. 11 to 5) of FIG. 11, the distance that it moves to come into contact with the fixed reduction surface (32) is formed very small, so the reversal shock generated at the wiping reduction surface (55) and the fixed reduction surface (32) occurs in an extremely small form, and as the secondary bending progresses, the elastic force F0 due to the elastic deformation of the bending part (40) is offset by the rotational force F5, thereby minimizing the reversal shock.

[0080] As shown in 7) of Fig. 11, when a counter pressure F4 is applied to the rubber blade (20) and the wiping progress continues due to the wiping progress force F1, the wiping rotation part (51) of the wiping part (50) continues to contact the bending part (40) and the additional bending rotation of the wiping part (50) progresses, so that the lower part of the bending part (40) is fixed to the wiping part (50) and the upper part is in contact with the wiping rotation part (51), and while the bending part (40) and the wiping rotation part (51) are maintained in contact, a secondary bending occurs in which elastic deformation occurs in the longitudinal direction, and when the size of the rotational force F5 and the elastic force F0, which is the reaction force due to the elastic deformation of the bending part (40), reach an equilibrium, the bending rotation of the wiping part (50) stops.

[0081] Even at this time, the wiping deceleration surface (55) of the wiping part (50) comes into contact with the fixed deceleration surface (32) of the fixed part (30) due to the rotational force F5, but as the movement progresses from 6) of FIG. 11 to 7) of FIG. 11, the distance that the wiping deceleration surface (55) moves to come into contact with the fixed deceleration surface (32) is formed very small, so the reversal shock generated at the wiping deceleration surface (55) and the fixed deceleration surface (32) occurs in a very small form, and as the secondary bending progresses, the elastic force F0 due to the elastic deformation of the bending part (40) is offset by the rotational force F5, thereby minimizing the reversal shock.

[0082] Even at this time, a phenomenon different from the prior art occurs, as shown in Fig. 5 (c)(d). In the prior art, as shown in Fig. 5 (c), the pressure applied to the fixed surface (25) of the fixed part (30) that increases in height and then suddenly decreases in height as shown in Fig. 5 (d) due to the pressure of the wiper arm (not shown) and at the same time the rotational force of the stationary part (26) of the wiping part (50) that rotates around the center of the bend (41) moves in opposite directions and collides with each other at one point, resulting in a large reverse shock.

[0083] On the other hand, in the case of the rubber blade (20) according to the embodiment of the present invention as shown in 6) and 7) of FIG. 11, the wiping reduction surface (55) of the wiping part (50) comes into contact with the fixed reduction surface (32) of the fixed part (30) by the rotational force F5, but as it progresses to 6) and 7) of FIG. 11, the distance that the wiping reduction surface (55) moves to come into contact with the fixed reduction surface (32) is formed very small, so the reverse shock generated at the wiping reduction surface (55) and the fixed reduction surface (32) is minimized and occurs in a very small form.

[0084] As shown in 7) of Fig. 11, when the bending rotation stops and the minimization of all reverse shocks is completed, only the pressure F2 of the wiper arm (not shown) rather than the counter pressure F4 is applied to the rubber blade (20), and the elastic force F0 of 7) of Fig. 11, which is the reaction force of the elastic deformation of the bending portion (40), acts greater than the rotational force F5, so that the bending rotation angle of the wiping portion (50) is reduced by the force in the opposite direction, and changes from the rotational angle d to the rotational angle c, and as shown in 8) of Fig. 11, the elastic deformation of the bending portion (40) is also reduced, and F0 and F5 achieve a balance of force, and the wiping movement is performed at the fixed wiping angle c', so that the wiping is performed while exhibiting the best wiping performance by the optimal wiping angle.

[0085] <Second Embodiment>

[0086] As shown in the cross-sectional views 1), 2) and 3) of Fig. 12, the rubber blade (20) having a structure that minimizes the reverse impact and maintains the optimal wiping angle according to the second embodiment of the present invention is as follows.

[0087] In 1) of Fig. 12, a rubber blade (20) having a structure for minimizing a reverse shock and maintaining an optimal wiping angle according to the second embodiment of the present invention is shown. Looking at the structure in its natural state, a bending part (40) that performs bending is positioned between a fixed part (30) that is combined with a wiper frame (11) to distribute and transmit wiping force and a wiping part (50) that performs wiping.

[0088] A fixed rotation part (31) formed by being connected to the upper part of the bending part (40) is located on the fixed part (30), and a fixed reduction surface (32) formed by being connected to the outside of the fixed rotation part (31) is located on the bottom of the fixed part (30). A fixed stop part (33) formed by being connected to the fixed reduction surface (32) is located on the outside of the fixed reduction surface (32).

[0089] The wiping part (50) is provided with a wiping support part (56) that is formed convexly outwardly and connected to the lower end of the bending part (40), so that the lower end of the bending part (40) is positioned lower than the upper end of the wiping part (50), and the wiping support part (56) is formed in a shape that surrounds the bending part (40). At the upper end of the wiping support part (56), a wiping rotation part (51) formed in the direction of the bending part (40) is positioned, and a wiping reduction surface (55) formed in an outward direction from the wiping rotation part (51) is positioned at the upper end of the wiping part (50). At the outer end of the wiping reduction surface (55), a wiping stop part (52) formed in connection with the wiping reduction surface (55) is positioned.

[0090] At the lower end of the wiping part (50), a wiping contact part (53) is formed and positioned downward, and at the lower end of the wiping contact part (53), a wiping blade (54) is positioned in contact with the glass surface (70).

[0091] All of the components formed in this way are configured to be approximately symmetrical left and right with the center line (60) as the center to form the cross section of the rubber blade (20), and when the cross section formed in this way is formed to be long in the longitudinal direction, a completed rubber blade (20) as shown in Fig. 1 is formed.

[0092] As shown in the cross-sectional view in 2) of FIG. 12, when looking at the wiping state of the rubber blade (20) according to the second embodiment of the present invention, the pressured wiping blade (54) comes into contact with the glass surface (70) and is fixed in a position by the wiping friction force, and when the fixed part (30) of the rubber blade (20) begins to move in the wiping progress direction by receiving the wiping progress force, the wiping part (50) rotates around the wiping blade (54), and when the bending part (40) bends and the wiping part (50) bends and rotates in the opposite direction to the wiping progress direction, the bending part (40) bends and the wiping rotation part (51) of the wiping part (50) moves in the direction of the fixed rotation part (31) of the fixed part (30), and comes into contact and close contact.

[0093] This bending creates a curvature in which the entire bending portion (40) bends in the opposite direction to the wiping direction. The amount of bending of this bending can be determined by adjusting the distance from the wiping rotation portion (51) of the wiping portion (50) to the fixed rotation portion (31) of the fixed portion (30) and the length from the top to the bottom of the bending portion (40), which can be called the first bending.

[0094] As shown in the cross-sectional view in 3) of FIG. 12, when looking at the wiping state of the rubber blade (20) according to the second embodiment of the present invention, as the wiping movement started in 2) of FIG. 12 continues, the wiping part (50) rotates additionally around the wiping blade (54), and accordingly, the bending part (40) bends additionally. Since the wiping rotation part (51) of the wiping part (50) is in close contact with the fixed rotation part (31) of the fixed part (30) in 2) of FIG. 12, the additional bending of the bending part (40) occurs around the wiping rotation part (51).

[0095] This bending is not performed in the opposite direction of the wiping direction as in 2) of Fig. 12, but rather, the wiping rotation part (51) of the wiping part (50) is in contact with the fixed rotation part (31) and is stopped, so that the bending part (40), which is made of a flexible and elastic material, undergoes elastic deformation downward, and the length of the bending part (40) increases. Accordingly, the wiping part (50) bends and rotates around the wiping rotation part (51), and this can be called secondary bending.

[0096] At this time, when the wiping part (50) rotates in the opposite direction of the wiping progress, the wiping rotation part (51) of the wiping part (50) is in close contact with the fixed rotation part (31) of the fixed part (30), so that the bending part (40) is bent a second time around the wiping rotation part (51), and the wiping reduction surface (55) of the wiping part (50) comes into contact with the fixed reduction surface (32) of the fixed part (30), and the bending part (40), which is a flexible and elastic material, undergoes elastic deformation in which the length increases in the downward direction through the second bending, and contact occurs between the wiping reduction surface (55) and the fixed reduction surface (32), and in 3) of FIG. 12, the bending part (40) undergoes elastic deformation in the downward direction during the second bending, and an elastic force is generated that pulls in the upward direction, and this elastic force has the function of minimizing the reverse shock. It will be done.

[0097] <Third Embodiment>

[0098] The following is a detailed description of the wiping motion and the reverse wiping motion of the rubber blade (20) according to the third embodiment of the present invention, which starts from the natural state of FIG. 13 and progresses to the wiping state in FIGS. 14, 15, 16, 17 and 18, the process of minimizing the reverse shock of the bending rotation and the formation of the optimal angle of the wiping contact portion (53) for the best wiping performance of the wiping blade (54) after absorbing the reverse shock.

[0099] As shown in Fig. 13, the rubber blade (20) having a structure for minimizing and absorbing a reverse shock according to the third embodiment of the present invention, when looking at the structure in its natural state, a bending part (40) that performs bending is positioned between a fixed part (30) that is combined with a wiper frame (11) to distribute and transmit wiping force and a wiping part (50) that performs wiping.

[0100] In the bending part (40), the first bending axis (42) is positioned at the bottom, and the second bending axis (43) is positioned at the top. At the lower end of the first bending axis (42), the wiping support part (55) of the wiping part (50) is positioned so as to be connected to an outer side higher than the lower end of the first bending axis (42). In addition, the first bending axis (42) is positioned lower than the upper end of the wiping part (50), and the wiping support part (55) connected to the first bending axis (42) is formed and positioned in a shape that surrounds the bending part (40). In the upper end of the wiping support part (55), a wiping reduction part (52) is formed in the direction of the bending part (40), and a wiping stop part (51) is connected and positioned so as to be connected to the outer side of the wiping reduction part (52).

[0101] The upper part of the second bending shaft (43) which is positioned to be connected to the upper part of the first bending part (42) of the bending part (40) is positioned to be connected to the upper part of the fixed stop part (31) of the fixed part (30) in an outward upward direction, and the second bending part (43) is positioned to be connected to the inner part of the wiping reduction part (52) of the wiping part (50).

[0102] At the lower end of the wiping part (50), a wiping contact part (53) is formed and positioned downward, and at the lower end of the wiping contact part (53), a wiping blade (54) is positioned in contact with the glass surface (70).

[0103] All of the components formed in this way are configured to be approximately symmetrical left and right with the center line (60) as the center to form the cross section of the rubber blade (20), and when the cross section configured in this way is formed to the entire length, a completed rubber blade (20) as shown in Fig. 1 is formed.

[0104] As illustrated in FIG. 14, the rubber blade (20) according to the third embodiment of the present invention is a wiping motion in which the rubber blade (20) is always in a wiping state in the manner of "stop in wiping state -> reverse -> wiping in progress -> reverse -> wiping in progress -> reverse -> wiping in progress -> stop in wiping state" according to the wiping motion of a general vehicle wiper blade. Therefore, the pressure acting on the rubber blade (20) in the embodiment of the present invention due to the wiping motion in an actual vehicle and the process of minimizing the reverse shock of the bending rotation due to the wiping progress force and the change in the structure that maintains the optimal angle are illustrated as successive cross-sectional views as follows.

[0105] In (1) of Fig. 14, the rubber blade (20) moves with a wiping force F1' while the pressure F2 of the wiper arm (not shown) continues to act, and then starts a reverse wiping movement with a wiping force F1 through a reversal in which only the direction of movement is reversed at the same speed, and when the rubber blade (20) moves with the wiping force F1, the wiping blade (54) is in close contact with the glass surface (70) due to the wiping frictional force, and the wiping part (50) is rotated in the opposite direction of the wiping direction, so that the height of the rubber blade (20) increases, and the wiper arm (not shown) is pushed up with a force F3, so that the rubber blade (20) becomes close to a natural state as in (2) of Fig. 14.

[0106] As shown in (3) of Fig. 14, when the wiping progress continues by the wiping progress force F1, the wiping blade (54) is in close contact with the glass surface (70) due to the wiping friction force, and the wiping part (50) begins to rotate in the opposite direction to the wiping progress direction. At this time, a reverse pressure F4, which is a combined shock load of the pressure F2 of the wiper arm (not shown) and the shock of going up and then down, is applied to the rubber blade (20).

[0107] As shown in (4) of Fig. 14, when the counter pressure F4 is applied to the rubber blade (20) and the wiping progress continues by the wiping progress force F1, the additional bending rotation of the wiping part (50) progresses, and as shown in (5) of Fig. 14, the additional bending rotation of the wiping part (50) progresses, and when the elastic deformation of the bending part (40) stops and equilibrium is reached, the bending rotation of the wiping part (50) stops.

[0108] As shown in (6) of Fig. 14, when the bending rotation stops and the deformation of the bending portion (40) due to the reverse impact is completed, only the pressure F2 of the wiper arm (not shown) rather than the reverse pressure F4 is applied to the rubber blade (20), and the applied pressure is reduced so that the bending portion (40) achieves an equilibrium of elastic deformation and performs a wiping movement at a fixed wiping angle.

[0109] The process of minimizing the reverse shock of the bending rotation due to the pressure and wiping force acting on the rubber blade (20) in the embodiment of the present invention shown in the successive cross-sectional views of Fig. 14 and the change in the structure for maintaining the optimal angle are described in detail in Figs. 15, 16, 17 and 18 below.

[0110] As shown in the cross-sectional view in FIG. 15, when looking at the wiping state in which the reverse wiping motion of the rubber blade (20) according to the third embodiment of the present invention starts, the reverse pressure F4, which is the combined impact load of the pressure of the wiper arm (not shown) plus the impact force that goes up and down, is applied to the rubber blade (20), and the wiping blade (54) that has received the pressure comes into contact with the glass surface (70) and is fixed in a position by the wiping friction force, and when the fixing part (30) of the rubber blade (20) starts to move in the wiping progress direction by receiving the wiping progress force F1, the wiping part (50) rotates around the wiping blade (54), and when the wiping part (50) is rotated in the opposite direction of the wiping progress direction, the first bending axis (42) of the bending part (40) is bent, and the wiping reduction part (52) of the wiping part (50) is It moves in the direction of the bend (40) and comes into close contact.

[0111] This bending of the first bending axis (42) is performed in the opposite direction of the wiping progress centering on the first bending axis (42), and can be called the first bending. In order to minimize the reversal shock, the smaller the bending amount of the first bending, the better; however, considering the structure, elasticity and strength of the rubber blade (20), the manufacturing method, etc., the distance from the wiping reduction part (52) of the wiping part (50) to the bending part (40) can be appropriately adjusted to form. In general, the bending amount of the first bending, the rotation angle a of Fig. 15, can be determined between 5 and 30 degrees.

[0112] When the wiping part (50) rotates by a rotation angle a around the center line (60), the wiping contact part (53) of the wiping part (50) tilts by a wiping angle a' corresponding to the rotation angle a with respect to the glass surface (70) with the wiping blade (54) as the center, moves in the wiping direction, and wiping begins, and a rotational force F5 is generated in the opposite direction to the wiping direction, and this rotational force F5 is transmitted to F6 around the first bending axis (42), so that the wiping reduction part (52) receiving the pressure F6 comes into close contact with the bending part (40).

[0113] At this time, a phenomenon different from the prior art occurs, as shown in Fig. 6 (A)(B). In the prior art, as shown in Fig. 6 (A)(B), the pressure applied to the fixed surface (25) of the fixed part (30) that increases in height and then suddenly decreases in height due to the pressure of the wiper arm (not shown) and the rotational force of the stop part (26) of the wiper part (50) that rotates around the center of the bending point (41) of the bending part (40) move in opposite directions and collide at one point, resulting in a large reverse shock.

[0114] On the other hand, in the case of the rubber blade (20) according to the third embodiment of the present invention as illustrated in FIG. 15, when the wiping reduction part (52) of the wiping part (50) comes into contact with the bending part (40), the direction of the pressure F6 generated by the wiping progress force and the direction of the reverse pressure F4 do not face each other at one point, but meet at an angle close to approximately 90 degrees, so that the reverse shock acts smaller than in the prior art, and as a result, the shock transmitted by the wiping blade (54) to the glass surface (70) also acts very small.

[0115] As shown in the cross-sectional view in FIG. 16, when the wiping motion of the rubber blade (20) according to the third embodiment of the present invention is in progress and the bending rotation of the wiping part (50) is additionally performed, the wiping state of the rubber blade (20) is shown. As the wiping motion started in FIG. 15 is further performed, the counter pressure F4 is continuously applied to the rubber blade (20), and the wiping part (50) receives the wiping progress force F1 and additionally rotates around the wiping blade (54), and accordingly, additional bending occurs in the first bending axis (42) of the bending part (40). In FIG. 15, since the wiping reduction part (52) of the wiping part (50) is in contact with the bending part (40) by receiving the pressure F6, in addition to the additional bending of the first bending axis (42) of the bending part (40), the second bending axis (43) is also bent. It works.

[0116] Since the wiping reduction part (52) of the wiping part (50) is in contact with the bending part (40), the bending part (40), which is made of a flexible and elastic material, is bent and elastically deformed downwards, causing the length of the bending part (40) to increase, and accordingly, the wiping part (50) rotates around the wiping reduction part (52) so that bending progresses. This can be called secondary bending in which bending rotation occurs around the wiping reduction part (52).

[0117] At this time, when the wiping part (50) rotates by a rotation angle b in the opposite direction of the wiping progress, the bending part (40) is in contact with the wiping reduction part (52) of the wiping part (50), so the bending part (40) is bent a second time around the wiping reduction part (52), and the wiping stop part (51) of the wiping part (50) comes into contact with the fixed stop part (31) of the fixed part (30), and the rotation progresses to a rotation angle b, and the wiping angle b' is formed corresponding to the rotation angle b.

[0118] In addition, when the second bend is made, the bending portion (40) is subjected to a downward rotational force F5 centered on the wiping reduction portion (52), causing elastic deformation in the longitudinal direction of the bending portion (40), while at the same time, an elastic force F0 is generated as a reaction force pulling upward, and the reverse shock generated when the wiping stop portion (51) and the fixed stop portion (31) come into contact is minimized by this elastic force F0.

[0119] As shown in the cross-sectional view in Fig. 17, when the wiping motion of the rubber blade (20) according to the third embodiment of the present invention progresses and the bending rotation of the wiping part (50) is completed, the wiping state of the rubber blade (20) absorbing the shock is observed. As the wiping motion progresses further, the counter pressure F4 is continuously applied to the rubber blade (20), and the wiping part (50) receives the wiping progress force F1, and additional rotation occurs around the wiping blade (54), and accordingly, additional bending occurs in the first bending axis (42) and the second bending axis (43) of the bending part (40). Since the wiping reduction part (52) of the wiping part (50) is in contact with the bending part (40) by receiving the pressure F6, the second bending axis (43) as well as the first bending axis (42) of the bending part (40) is additionally bent. It occurs, and the bending rotation of the wiping part (50) progresses to a rotation angle d, and the wiping angle d' is formed corresponding to the rotation angle d.

[0120] When the bending part (40) is bent for the second time, additional elastic deformation occurs in the longitudinal direction of the bending part (40), and the elastic force F0 that pulls upward increases. This increased elastic force F0 acts to minimize the reversal shock, and when the elastic force F0 of the bending part (40) and the rotational force F5, which is the force that causes the wiping part (50) to rotate, are balanced, the bending rotation of the wiping part (50) stops at the rotation angle d.

[0121] The value of the rotation angle d can be adjusted by adjusting the shape and curvature of the wiping reduction unit (52) and the wiping stop unit (51) and the shape and inclination of the fixed stop unit (31), and accordingly, the wiping angle d' corresponding to the rotation angle d can also be adjusted. In general, the rotation angle d at which the bending rotation of the wiping unit (50) stops is determined between 30 degrees and 45 degrees.

[0122] However, in order to secure the best wiping performance, the optimal wiping angle formed by the wiping contact part (53) of the rubber blade (20) and the wiping edge (54) and the glass surface (70) must be set larger than the wiping angle d' of Fig. 17, but in order to sufficiently achieve the purpose of minimizing the reversal shock, the rotation angle d of Fig. 17 is formed large, and the wiping angle d' is made smaller than the optimal wiping angle.

[0123] Therefore, in order to secure the best wiping performance, the wiping movement must be performed at an angle greater than the wiping angle d' at which the bending rotation of the wiping reverse movement of the wiping part (50) stops, and the structure for maintaining the optimal wiping angle after minimizing the reverse shock for this purpose is illustrated and described in Fig. 18).

[0124] As shown in the cross-sectional view in Fig. 18, when the wiping motion of the rubber blade (20) according to the third embodiment of the present invention is performed and the bending rotation of the wiping part (50) is stopped and the minimization of all reverse shocks is completed, only the pressure F2 of the wiper arm (not shown) rather than the counter pressure F4 is applied to the rubber blade (20), so that the corresponding working pressure is reduced, and accordingly, the elastic force F0, which is the reaction force of the elastic deformation of the bending part (40) in Fig. 17, acts greater than the rotational force F5, so that the bending rotation angle of the wiping part (50) is reduced by the force in the opposite direction, and changes from the rotational angle d to the rotational angle c, and accordingly, the elastic deformation of the bending part (40) is also reduced, and the elastic force F0 in Fig. 18 also decreases, and a balance of force is achieved with F5, so that the wiping motion is performed at the fixed wiping angle c', so that the optimal wiping angle is achieved. Wiping is performed while demonstrating the best wiping performance.

[0125] <Fourth Embodiment>

[0126] The following is a detailed description of the process of minimizing the reverse shock of the bending rotation in the wiping motion and the reverse wiping motion of the rubber blade (20) according to the fourth embodiment of the present invention, which starts from the natural state of Fig. 19 and progresses to the wiping state in Figs. 20 and 22.

[0127] As shown in Fig. 19, the rubber blade (20) having a structure for minimizing and absorbing a reverse shock according to the fourth embodiment of the present invention, when looking at the structure in its natural state, a bending part (40) that performs bending is positioned between a fixed part (30) that is combined with a wiper frame (11) to distribute and transmit wiping force and a wiping part (50) that performs wiping.

[0128] The bending portion (40) is formed by connecting downward from the fixed reduction surface (31) connected to the upper portion to the lower portion, and the lower portion is connected to the wiping support portion (52) of the wiping portion (50), and the bending center point (41) is positioned at the center of the point where the wiping support portion (52) is connected to the lower portion of the bending portion (40), so that the center line (60) passes vertically on the glass surface (70).

[0129] In the fixed part (30), a fixed reduction surface (31) formed in an upward outward direction connected to the upper part of the bending part (40) is formed at the lower part of the fixed part (30), and in the wiping part (50), a wiping support part (52) formed in a convex shape connected to the lower part of the bending part (40) and formed at the lower part of the wiping part (50) is connected so that the lower part of the bending part (40) is positioned lower than the upper part of the wiping part (50), and the wiping support part (52) is formed in a shape that surrounds the bending part (40), and a wiping reduction surface (51) formed in an upward outward direction connected to the upper part of the wiping support part (52) is positioned.

[0130] At the lower end of the wiping part (50), a wiping contact part (53) is formed and positioned downward, and at the lower end of the wiping contact part (53), a wiping blade (54) is positioned in contact with the glass surface (70).

[0131] All of the components formed in this way are configured to be approximately symmetrical left and right with the center line (60) as the center to form the cross section of the rubber blade (20), and when the cross section formed in this way is formed to be long in the longitudinal direction, a completed rubber blade (20) as shown in Fig. 1 is formed.

[0132] As shown in the cross-sectional view in FIG. 20, when the wiping state in which the rubber blade (20) according to the fourth embodiment of the present invention starts the reverse wiping movement is observed, the pressured wiping blade (54) comes into contact with the glass surface (70) and is fixed in a position by the wiping frictional force, and when the fixed part (30) of the rubber blade (20) begins to move in the wiping progress direction by receiving the wiping progress force, the wiping part (50) rotates around the wiping blade (54), and when the bending part (40) occurs and the wiping part (50) bends and rotates in the opposite direction to the wiping progress direction, the bending part (40) bends and the wiping reduction surface (51) of the wiping part (50) moves in the direction of the bending part (40) and comes into contact and close contact.

[0133] When this wiping part (50) makes a bending rotation, the wiping stop point (55) of the wiping reduction surface (51) comes into contact with the bending stop point (45), and the bending rotation stops.

[0134] As shown in the cross-sectional view in FIG. 20, the structure in which the reverse shock is minimized in the process of stopping the bending rotation in the wiping state that starts the reverse wiping movement of the rubber blade (20) according to the fourth embodiment of the present invention is examined in detail in FIG. 21. The wiping stop point (55) and the bending stop point (45) are located at the points where the wiping deceleration surface (51) of the wiping part (50) makes the bending rotation and comes into contact with the bending part (40), respectively. The angle between the straight line connecting the wiping stop point (55) of the wiping part (50) and the bending center point (41) of the bending part (40) and the straight line connecting the bending stop point (45) and the bending center point (41) of the bending part (40) is the minimum rotation angle of the wiping part (50), which is an important factor in determining the wiping performance and is generally determined to be between 15 and 35 degrees. Therefore, since the two straight lines must maintain the angle that has already been determined, it is necessary to determine the direction of the rotational force by adjusting the angle c, which is the angle formed by the bisector between the two straight lines and the center line (60).

[0135] In Fig. 21, a rotational force is applied to the wiping part (50) in the 90-degree direction of the straight line connecting the wiping stop point (55) and the bending center point (41), and the direction of this rotational force is such that as the bending rotation progresses, when the wiping stop point (55) comes into contact with the bending stop point (45), the force is applied in the 90-degree direction of the straight line connecting the bending stop point (45) and the bending center point (41).

[0136] At this time, a phenomenon different from the prior art occurs, as shown in FIGS. 6 A and B, in the prior art, the rotational force of the stationary part (26) of the wiping part (50) that rotates around the center of the bending point (41) as shown in FIGS. 6 A and B moves in opposite directions simultaneously with the pressure applied to the fixed surface (25) of the fixed part (30), and collides with each other at one point, resulting in a large reverse shock.

[0137] On the other hand, in the case of the rubber blade (20) according to the fourth embodiment of the present invention as illustrated in FIG. 21, the wiping reduction surface (51) of the wiping part (50) comes into contact with the bending stop point (45) due to the rotational force, but the contact is formed so that the direction of the rotational force and the direction of the pressure generated and transmitted from the wiper arm (not shown) maintain an angle of approximately 90 degrees, so that the reverse shock generated between the wiping stop point (55) and the bending stop point (45) is minimized and generated in a very small form.

[0138] In this way, it is advantageous for minimizing the reversal shock to form the two straight lines connecting the bending center point (41), the wiping stop point (55), and the bending stop point (45) at a small angle with respect to the center line (60). Therefore, as illustrated in Fig. 21, the angle c formed between the bisector of these two straight lines and the center line (60) is also better as it is closer to 0 degrees for the purpose of minimizing the reversal shock. However, considering the structure, elasticity and strength of the rubber blade (20), the manufacturing method, etc., the angle c can generally be determined between 3 and 60 degrees.

[0139] As shown in the cross-sectional view in FIG. 22, when the wiping motion of the rubber blade (20) according to the fourth embodiment of the present invention is in progress and the bending rotation of the wiping part (50) is additionally performed, the wiping part (50) additionally rotates around the wiping blade (54) as the wiping motion started in FIG. 20 is additionally performed, and accordingly, the bending part (40) is additionally bent. In FIG. 20, the wiping reduction surface (51) of the wiping part (50) is rolled along the fixed reduction surface (31) of the fixed part (30), and the bending part (40), which is a flexible and elastic material, is bent and elastically deformed downward around the contact portion between the wiping reduction surface (51) of the wiping part (50) and the fixed reduction surface (31) of the fixed part (30), and the length of the bending part (40) is increased. As it increases, the wiping part (50) is bent in a way that it rotates along the wiping reduction surface (51).

[0140] In Fig. 22, the wiping part (50) has a smooth angular change in which the wiping reduction surface (51) rotates by bending only through cloud contact along the fixed reduction surface (31) of the fixed part (30), so that no impact occurs, and the bending part (40) undergoes elastic deformation in the downward direction while at the same time, an elastic force is generated that pulls in the upward direction, and this elastic force acts to absorb the reversal impact.

[0141] <Example 5>

[0142] As shown in the cross-sectional views 1) and 2) of Fig. 23, the rubber blade (20) having a structure for minimizing and absorbing a reverse shock according to the fifth embodiment of the present invention is as follows.

[0143] In 1) of Fig. 23, a rubber blade (20) having a structure for minimizing a reverse shock and maintaining an optimal wiping angle according to the fifth embodiment of the present invention is shown in its natural state. When looking at the structure, a bending part (40) that performs bending is positioned between a fixed part (30) that is combined with a wiper frame (11) to distribute and transmit wiping force and a wiping part (50) that performs wiping.

[0144] The bending portion (40) is formed by connecting downward from the fixed reduction surface (31) connected to the upper portion to the lower portion, and the lower portion is connected to the wiping support portion (52) of the wiping portion (50), and the bending center point (41) is positioned at the center of the point where the wiping support portion (52) is connected to the lower portion of the bending portion (40), so that the center line (60) passes vertically on the glass surface (70).

[0145] In the fixed part (30), a fixed reduction surface (31) formed by being connected to the upper part of the bending part (40) is formed at the lower part of the fixed part (30), and in the wiping part (50), a wiping support part (52) formed by being connected to the lower part of the bending part (40) and convexly formed in an outward direction is provided, so that the lower part of the bending part (40) is positioned lower than the upper part of the wiping part (50), and the wiping support part (52) is formed in a shape that surrounds the bending part (40), and in the upper part of the wiping support part (52), a wiping reduction surface (51) formed by being connected to the upper part of the wiping part (50) in an outward direction is positioned at the upper part of the wiping part (50).

[0146] At the lower end of the wiping part (50), a wiping contact part (53) is formed and positioned downward, and at the lower end of the wiping contact part (53), a wiping blade (54) is positioned in contact with the glass surface (70).

[0147] All of the components formed in this way are configured to be approximately symmetrical left and right, so as to form a cross-section of a rubber blade (20) each composed of two wiping portions (50) and two bending portions (40), and when the cross-section configured in this way is formed lengthwise, a completed rubber blade (20) as shown in Fig. 1 is formed.

[0148] As shown in the cross-sectional view in 2) of FIG. 23, when looking at the wiping state of the rubber blade (20) according to the fifth embodiment of the present invention, the wiping blade (54) that has been pressed comes into contact with the glass surface (70) and is fixed in a position by the wiping frictional force, and when the fixing part (30) of the rubber blade (20) begins to move in the wiping progress direction by receiving the wiping progress force, the wiping part (50) rotates around the wiping blade (54), and when the bending part (40) occurs and the wiping part (50) bends and rotates in the opposite direction to the wiping progress direction, the bending part (40) bends and the wiping reduction surface (51) of the wiping part (50) moves in the direction of the bending part (40) and comes into contact and close contact.

[0149] When this wiping part (50) makes a bending rotation, the wiping stop point (55) of the wiping reduction surface (51) comes into contact with the bending stop point (45), and the bending rotation stops.

[0150] Accordingly, the fifth embodiment of the present invention of 1) and 2) of FIG. 23 also has a structure and basic operating principle for minimizing and absorbing reverse shock, which are the same as those of the fourth embodiment of the present invention of FIG. 19 and FIG. 20.

[0151] The present invention relates to a rubber blade having a structure that absorbs the reversal shock generated during the wiping reverse wiping movement of a vehicle wiper blade, thereby significantly reducing reversal noise. The present invention can be applied to all wiper blades used in automobiles, and significantly reduces the noise generated during the operation of wiper blades installed in various vehicles such as passenger cars, SUVs, trucks, and buses, thereby enabling drivers to drive more comfortably. Therefore, the present invention can be industrially applied throughout the automobile industry.

Claims

1. A rubber blade of a wiper blade, comprising: at least one wiping part including a wiping blade for wiping a glass surface; at least one bending part connected to the wiping part and performing a bending motion; and a fixing part connected to the bending part and fixing a bending rotation angle of the wiping part, wherein a fixed rotation part is formed and positioned connected to the upper end of the bending part on the fixing part, and a fixed reduction surface is formed and positioned connected to and positioned in an outward direction of the fixed rotation part; a wiping support part is formed and positioned connected to the lower end of the bending part on the wiping part, and a wiping rotation part is formed and positioned connected to and positioned on the upper end of the wiping support part, and a wiping reduction surface is formed and positioned connected to and positioned in an outward direction of the wiping rotation part. A rubber blade formed such that when the wiping part bends and rotates, the wiping rotation part of the wiping part comes into contact with the bending part, and the first bending of the bending part stops, and when the bending rotation of the wiping part continues, the wiping rotation part maintains contact with the bending part, and the second bending of the bending part proceeds.

2. A rubber blade of a wiper blade, comprising at least one wiping part including a wiping blade for wiping a glass surface, at least one bending part connected to the wiping part and performing a bending motion, and a fixed part connected to the bending part and fixing a bending rotation angle of the wiping part, wherein a fixed rotation part is formed and positioned connected to the upper end of the bending part in the fixed part, and a fixed reduction surface is formed and positioned connected to and positioned in an outward direction of the fixed rotation part, and a wiping support part is formed and positioned connected to the lower end of the bending part in the wiping part, and a wiping rotation part is formed and positioned connected to and positioned on the upper end of the wiping support part, and a wiping reduction surface is formed and positioned connected to and positioned in an outward direction of the wiping rotation part, wherein when the wiping part rotates in a bending manner, the wiping rotation part of the wiping part comes into contact with the fixed rotation part of the fixed part, and the first bending of the bending part stops, and when the bending rotation of the wiping part continues, the wiping rotation part maintains contact with the fixed rotation part, and the second bending of the bending part proceeds.

3. A rubber blade of a wiper blade, comprising at least one wiping part including a wiping blade for wiping a glass surface, at least one bending part connected to the wiping part and performing a bending motion, and a fixing part connected to the bending part and fixing a bending rotation angle of the wiping part, wherein a first bending axis is formed and positioned at the lower end of the bending part, a second bending axis is formed and positioned at the upper end of the bending part, a fixed stop part of the fixing part is connected and positioned at the upper end of the second bending axis, a wiping support part of the wiping part is connected and positioned at the lower end of the first bending axis, a wiping reduction part is connected and positioned at the upper end of the wiping support part of the wiping part, and a wiping stop part is connected and positioned at the upper end of the wiping reduction part, wherein when the wiping part makes a bending rotation, the first bending axis makes a first bend so that the wiping reduction part of the wiping part comes into contact with the bending part, and when the bending rotation of the wiping part continues, the wiping reduction part comes into contact with the bending part. A rubber blade formed so that the second bending of the second bending axis proceeds while maintaining it.

4. A rubber blade of a wiper blade, comprising at least one wiping section including a wiping blade for wiping a glass surface, at least one bending section connected to the wiping section and performing a bending motion, and a fixing section connected to the bending section and fixing a bending rotation angle of the wiping section, wherein the fixing section is connected to the upper end of the bending section and has a fixed reduction surface connected and positioned in an upward outward direction, and the wiping section is connected to the lower end of the bending section and has a wiping support section connected and positioned in an upward outward direction, and the wiping support section is connected to the upper end of the wiping support section and has a wiping reduction surface connected and positioned in an upward outward direction, wherein a rubber blade in which an angle between a straight line connecting a wiping stop point of the wiping section and a bending center point of the bending section and a bisector between a straight line connecting the bending stop point and the bending center point of the bending section and a center line is formed in a range of 3 to 60 degrees.

5. A rubber blade formed so that when the second bending in claims 1 and 2 is performed, the wiping reduction surface of the wiping part comes into contact with the fixed reduction surface of the fixing part.

6. A rubber blade formed so that when the second bending occurs in claims 1, 2, and 3, the bending portion undergoes elastic deformation in the longitudinal direction.

7. A rubber blade formed so that the rotation angle of the wiping portion is reduced by the elasticity of the bending portion after the second bending stops in claims 1, 2, and 3.

8. A rubber blade formed so that when the bending rotation of the wiping part in claim 4 progresses, the wiping stop point and the bending stop point come into contact, and then the wiping reduction surface of the wiping part and the fixed reduction surface of the fixed part are in continuous contact.

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