Noise-reducing rubber blade for vehicle wiper blade, for reverse impact absorption and optimum wiping

Abstract

The present invention provides a noise-reducing rubber blade for a vehicle wiper blade, in which the rubber blade is positioned in the frame of a vehicle wiper blade and receives a wiping motion force of a wiper arm in order to wipe a glass surface. A fixed portion of the rubber blade, in which a bent portion is positioned between a wiping portion and the fixed portion, is provided with a fixed deceleration portion, and the wiping portion is provided with an elastic deceleration portion and a wiping deceleration surface. Thus, a reverse impact between the wiping portion and the fixed portion is reduced by means of a mutual deceleration operation between the wiping deceleration surface and the fixed deceleration portion during the reverse wiping movement of the rubber blade, thereby softening impacts on the glass surface, which are transferred through a wiping blade, and reducing reverse noise of the rubber blade.

Description

Rubber blades for vehicle wiper blades that absorb reverse shock and reduce noise for optimal wiping.

[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 reduce a reversal shock transmitted to a glass surface through a wiping edge of a rubber blade during a reverse wiping motion while the wiper blade is wiping, maintain an optimal wiping angle, and have the best wiping performance while reducing reversal noise.

[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, in the longitudinal direction of the rubber blade (20) to wipe the glass surface.

[0004] The rubber blade (20) has various shapes, but there are two representative shapes 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 in the longitudinal direction to form the rubber blade (20).

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

[0007] 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 the 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).

[0008] 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).

[0009] 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.

[0010] 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 by making a bending rotation centered on 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, and performs a reverse wiping movement in which only the forward direction is reversed while maintaining the same speed as in (b) of Fig. 5, so that 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.

[0011] 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).

[0012] 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, as shown in (d) of Fig. 5, the fixed part (30) that had risen upward quickly descends again toward the glass surface (70), generating an impact force to apply a reverse pressure higher than the wiper arm pressure during the wiping process in the downward direction.

[0013] 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) by the center of the bending point (41), and the rotational force of the stationary part (26) in the opposite direction of the reverse pressure force about the center of the bending point (41) impacts the fixed surface (25), and at this time, the reverse pressure force and the rotational force collide in opposite directions, thereby generating an amplified reverse shock.

[0014] 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.

[0015] The present invention is designed to solve the above problems, and its purpose is to provide a rubber blade (20) that reduces the reverse shock generated between the fixed part (30) and the wiping part (50) during the reverse wiping movement of the wiper blade (10), thereby reducing the reverse noise caused by the shock transmitted to the glass surface (70) through the wiping blade (54) and also secures the wiping performance.

[0016] In order to achieve the above purpose, according to an embodiment of the present invention, a rubber blade (20) is provided with an elastic reduction portion (55) on the upper end of a wiping portion (50), a wiping reduction surface (51) is formed on the elastic reduction portion (55), and a fixed reduction portion (31) that mutually decelerates with the wiping reduction surface (51) is provided on the fixed portion (30), so that in the reverse wiping movement of the rubber blade (20), the wiping reduction surface (51) decelerates on the fixed reduction portion (31), and at the same time, the elastic reduction portion (55) elastically deforms to alleviate the reverse shock between the wiping portion (50) and the fixed portion (30), thereby reducing the transmitted shock that the wiping blade (54) of the wiping portion (50) applies to the glass surface (70), thereby reducing the reverse noise.

[0017] Accordingly, by applying the rubber blade (20) of the present invention, which is characterized in that the reverse shock generated during the reverse wiping movement and the shock transmitted by the wiping blade (54) to the glass surface (70) are reduced, thereby reducing the reverse noise, a wiper blade (10) having the same performance but being much quieter can be provided.

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

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

[0020] Figure 3 is a cross-sectional view showing the structure of a conventional rubber blade performing wiping.

[0021] Figure 4 is a drawing showing the position of the reverse wiping movement in the wiping area of ​​the glass surface.

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

[0023] Figure 6 is a cross-sectional view of the natural structure of the rubber blade of the first embodiment of the present invention.

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

[0025] Figure 8 is a cross-sectional view showing a structure for absorbing reverse shock in a wiping state of a rubber blade of the first embodiment of the present invention.

[0026] Figure 9 is a cross-sectional view showing a structure in which a rubber blade of the first embodiment of the present invention absorbs reverse shock and stops bending rotation in a wiping state.

[0027] Figure 10 is a cross-sectional view showing a structure in which the impact amount is reduced during the reverse wiping movement of the rubber blade of the first embodiment of the present invention.

[0028] Fig. 11 is a cross-sectional view showing a rubber blade according to the second embodiment of the present invention.

[0029] Figure 12 is a cross-sectional view of the natural state structure of a rubber blade according to the third embodiment of the present invention.

[0030] Figure 13 is a cross-sectional view of the wiping state structure of the rubber blade of the third embodiment of the present invention.

[0031] Figure 14 is a cross-sectional view showing a structure that starts absorbing the reverse shock of the bending rotation in the wiping state of the rubber blade of the third embodiment of the present invention.

[0032] Figure 15 is a cross-sectional view showing a structure that absorbs the reverse shock of a bending rotation in a wiping state of a rubber blade of the third embodiment of the present invention.

[0033] Figure 16 is a cross-sectional view showing a structure in which the shock absorption of the reverse rotation of the rubber blade in the wiping state of the third embodiment of the present invention is carried out and then fixed at a specified angle.

[0034] Figure 17 is a cross-sectional view of a structure in which the rubber blade of the third embodiment of the present invention is restored to the optimal angle after the reverse state in the wiping state is completed and the reverse shock absorption is completed.

[0035] A rubber blade according to preferred embodiments of the present invention is described in detail with reference to the attached drawings.

[0036] In preferred 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) in the longitudinal direction 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).

[0037] <First Embodiment>

[0038] As shown in FIG. 6, the rubber blade (20) having a structure for reducing the reversal shock by reducing the reversal speed according to the first embodiment of the present invention, when looking at the structure in its natural state, a bending part (40) that performs a bending rotation is located 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, and a bending center point (41) that serves as the center of the bending rotation is located approximately at the center of the bending part (40).

[0039] An elastic reduction part (55) is formed and positioned on the upper part of the wiping part (50), a wiping stop part (52) is formed on the upper part of the elastic reduction part (55), and a wiping reduction surface (51) is formed and positioned on the inner upper part of the elastic reduction part (55) by connecting it to the wiping stop part (52), and the lower part of the wiping reduction surface (51) is positioned to be connected to the lower part of the bending part (40).

[0040] In the fixed part (30), when the wiping part (50) rotates around the bending part (40), the wiping reduction surface (51) of the elastic reduction part (55) of the wiping part (50) rotates around the bending center point (41) and moves toward the fixed part (30) to make contact first, and the fixed reduction part (31) is formed and positioned so that a fixed stop part (32) protrudes outward above the fixed reduction part (31).

[0041] All parts formed in this way are configured symmetrically left and right around the center line (60) to form a completed rubber blade (20).

[0042] As shown in the cross-sectional view in FIG. 7, when looking at the wiping state of the rubber blade (20) according to the first embodiment of the present invention, in the wiping state, the wiping blade (54) that is under pressure 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 rotation occurs around the bending center point (41) of the bending part (40), the wiping part (50) rotates in the opposite direction to the wiping progress direction, and the elastic reduction part (55) rotates around the bending center point (41), so that the wiping reduction surface (51) of the elastic reduction part (55) moves in the direction of the fixed reduction part (31) and comes into contact and close contact.

[0043] At this time, when the wiping part (50) rotates by a rotation angle a, the elastic reduction part (55) of the wiping part (50) also moves by a rotation angle a around the bending center point (41) and then comes into contact with the fixed reduction part (31), and the wiping contact part (53) of the wiping part (50) tilts by a wiping angle a with respect to the glass surface (70) around the wiping blade (54) and moves in the wiping direction, and wiping begins. The frictional force between the wiping reduction surface (51) and the fixed reduction part (31) causes the wiping part (50) to begin to decelerate in its bending rotation.

[0044] As shown in the cross-sectional view in FIG. 8, when looking at the wiping state of the rubber blade (20) in which the deceleration of the bending rotation of the wiping part (50) according to the first embodiment of the present invention is in progress, as the wiping that started in FIG. 7 progresses, the wiping part (50) additionally rotates around the wiping blade (54), and accordingly, additional bending rotation occurs around the bending center point (41) of the bending part (40), and when the wiping part (50) rotates by the rotation angle b of FIG. 8 in the opposite direction of the wiping progress direction, the elastic reduction part (55) should rotate around the bending center point (41) and move in a rotational motion to the position of the elastic reduction part (55') indicated by the dotted line, but the fixed reduction part (31) is in contact with it and prevents the rotational motion, so the elastic reduction part (55), which is made of a flexible and elastic material, has a frictional force between the wiping reduction surface (51) and the fixed reduction part (31). As the sliding motion occurs, an outward deformation, i.e., elastic deformation, occurs in the elastic reduction section (55') indicated by the dotted line to the position of the elastic reduction section (55), and the wiping angle b is formed corresponding to the rotation angle b.

[0045] At this time, if we look closely at the movement that occurs between the wiping reduction surface (51) and the fixed reduction part (31), the elastic reduction part (55) that has undergone outward deformation continuously applies pressure toward the fixed reduction part (31) due to the characteristics of the material that is flexible and elastic, and as the rotation angle changes, the rotation speed of the elastic reduction part (55) is decelerated through the frictional sliding between the wiping reduction surface (51) and the fixed reduction part (31) that receives the pressure of the elastic reduction part (55) that has undergone elastic deformation, thereby absorbing the shock between the wiping part (50) and the fixed part (30).

[0046] As shown in the cross-sectional view in FIG. 9, when the deceleration of the bending rotation of the wiping part (50) according to the first embodiment of the present invention is completed, the wiping part (50) rotates additionally with respect to the wiping blade (54) as the wiping progresses compared to FIG. 8, and accordingly, additional bending rotation occurs with respect to the bending center point (41) of the bending part (40), and when the wiping part (50) rotates by the rotation angle c of FIG. 9 in the opposite direction of the wiping progress direction, the elastic reduction part (55) rotates additionally with respect to the bending center point (41), but the fixed reduction part (31) contacts it and prevents the rotation, so that the elastic reduction part (55), which is a flexible and elastic material, undergoes additional elastic deformation to move outward at the top as the deceleration contact continues between the wiping reduction surface (51) and the fixed reduction part (31), and thus the rotational speed is reduced. When the wiping stop part (52) of the advanced elastic reduction part (55) comes into contact with the fixed stop part (32) of the fixed part (30), the rotation stops, and at this time, the wiping contact part (53) is fixed at an appropriate wiping angle c, so that the wiping blade (54) performs a wiping movement in the wiping progress direction.

[0047] In this process, the elastic reduction unit (55) reduces the rotational speed by decelerating contact, and the contact shock generated by the fixed stop unit (32) and the wiping stop unit (52) is also greatly alleviated. In addition, by adjusting the formation position of the fixed stop unit (32) or the wiping stop unit (52), the value of the rotation angle c can be adjusted, and accordingly, the wiping angle c corresponding to the rotation angle c can also be adjusted to the most optimal angle for wiping.

[0048] As shown in FIGS. 7, 8 and 9, the deceleration of the bending rotation of the wiping part (50) according to the first embodiment of the present invention is achieved by continuously making decelerating contact between the wiping deceleration surface (51) of the elastic deceleration part (55) and the fixed deceleration part (31) of the fixed part (30) from the rotation angle a of FIG. 7 to the rotation angle c of FIG. 9, thereby decelerating the rotational speed.

[0049] Since the rotational speed deceleration section starts at rotation angle a of Fig. 7 and ends at rotation angle c of Fig. 9, the greater the change in the two rotation angles at which deceleration contact occurs, the greater the deceleration effect and the greater the shock reduction effect, so that ideal deceleration and shock reduction effects can be expected, but considering the structure, elasticity and strength of the rubber blade (20), manufacturing method, etc., the rotational angle change at which deceleration contact continues, which is the angular difference between rotation angle a of Fig. 7 and rotation angle c of Fig. 9, can be appropriately determined between 1 degree and 40 degrees.

[0050] In addition, the elastic deformation of the elastic reduction unit (55) according to the change in the rotation angle is determined by the thickness of the elastic reduction unit (55). If the thickness of the elastic reduction unit (55) is thick, the rotational speed deceleration effect in the deceleration contact becomes large, but there is a problem that the rotation stops before reaching the wiping angle required for wiping, and if the thickness of the elastic reduction unit (55) is too small, the rotational speed deceleration effect in the deceleration contact becomes too small, which may cause a problem that it is difficult to obtain the desired shock reduction effect. Therefore, the appropriate thickness of the elastic reduction unit (55) can be adjusted according to the required rotational speed deceleration, and can be appropriately determined between 1.3 and 3.0 times the thickness of the bending unit (40) in consideration of the structure, elasticity and strength, manufacturing method, etc. of the rubber blade (20).

[0051] As shown in FIG. 10, the pressure and rotational force applied during the reverse wiping movement in which the rubber blade (20) according to the first embodiment of the present invention performs a wiping movement in the opposite direction, and the rotational speed and the reverse shock reduction action due to the frictional force are described in detail. In the wiping state, the pressured wiping blade (54) comes into contact with the glass surface (70) and is fixed in a position by the wiping frictional force. When the reverse wiping movement is started and the wiping progress force is received in the opposite direction, the fixing part (30) of the rubber blade (20) starts to move in the reverse progress direction, and the wiping part (50) rotates in the opposite direction around the wiping blade (54), and when the bending rotation occurs around the bending center point (41) of the bending part (40) and the wiping part (50) rotates in the opposite direction of the wiping progress direction, the elastic reduction part (55) rotates in the opposite direction around the bending center point (41). The wiping reduction surface (51) of the elastic reduction unit (55) moves toward the fixed reduction unit (31) and when it comes into contact with the fixed reduction unit (31), the wiping reduction surface (51) applies an impact to the fixed reduction unit (31) due to the rotational force of the elastic reduction unit (55).

[0052] 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.

[0053] On the other hand, in the case of the rubber blade (20) according to the first embodiment of the present invention as illustrated in FIG. 10, when the wiping reduction surface (51) of the elastic reduction part (55) of the wiping part (50) contacts and closely contacts the fixed reduction part (31) of the fixed part (30) with the center of the bending point (41) of the bending part (40) as the center, the direction of the rotational force generated by the wiping progress force and the direction of the pressure of the wiper arm (not shown) do not face each other at one point, but collide at an angle close to approximately 90 degrees, so that the impact is not as great as in the prior art, and at the point where the wiping reduction surface (51) and the fixed reduction part (31) come into contact, the elastic reduction part (55) undergoes elastic deformation in the outward direction, and the action of the rotational force also becomes smaller, and at the point of contact, a decelerating contact occurs due to the frictional force generated between the wiping reduction surface (51) and the fixed reduction part (31), so that the rotational speed is reduced. The reverse shock applied to the fixed stopper (32) by the wiping stopper (52) is also very small, and the reverse shock becomes very small compared to the prior art, and as a result, the shock transmitted to the glass surface (70) by the wiping blade (54) also becomes very small.

[0054] <Second Embodiment>

[0055] In (A) of FIG. 11, a rubber blade (20) having a structure for reducing a reversal shock by reducing a reversal speed according to a second embodiment of the present invention is shown. Looking at the structure in its natural state, a bending part (40) that performs a bending rotation is located 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, and a bending center point (41) that serves as the center of the bending rotation is located approximately at the center of the bending part (40).

[0056] An elastic reduction part (55) is formed and positioned on the upper part of the wiping part (50), a wiping reduction surface (51) is formed and positioned on the upper inner part of the elastic reduction part (55), a wiping stop part (52) is formed and positioned in a protruding manner by connecting to the lower part of the wiping reduction surface (51), and the lower end of the wiping stop part (52) is positioned to be connected to the lower end of the bending part (40).

[0057] In the fixed part (30), when the wiping part (50) rotates around the bending part (40), the wiping reduction surface (51) of the elastic reduction part (55) rotates around the bending center point (41) and moves toward the fixed part (30) to make contact first, and the fixed reduction part (31) is formed and positioned, and a fixed stop part (32) is formed and positioned on the inside of the lower part of the fixed reduction part (31), and the lower part of the fixed stop part (32) is positioned to be connected to the upper part of the bending part (40).

[0058] All parts formed in this way are configured symmetrically left and right around the center line (60) to form a completed rubber blade (20).

[0059] As shown in the cross-sectional view in (B) of FIG. 11, when looking at the wiping state of the rubber blade (20) in which the deceleration of the bending rotation of the wiping part (50) according to the second embodiment of the present invention is in progress, the rubber blade (20) is fixed in a position by the wiping frictional force by the wiping blade (54) that is under pressure in the wiping state and comes into contact with the glass surface (70), 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, the wiping part (50) rotates around the wiping blade (54), and when the bending rotation occurs around the bending center point (41) of the bending part (40) and the wiping part (50) rotates in the opposite direction of the wiping progress direction, the elastic reduction part (55) rotates around the bending center point (41), so that the wiping reduction surface (51) of the elastic reduction part (55) It moves toward the fixed reduction gear (31) and comes into close contact.

[0060] As wiping continues, the wiping part (50) rotates additionally around the wiping blade (54), and accordingly, additional bending rotation occurs around the bending center point (41) of the bending part (40), and when the wiping part (50) rotates in the opposite direction of the wiping direction, the elastic reduction part (55) rotates around the bending center point (41) and must rotate to the position of the elastic reduction part (55') indicated by the dotted line, but since the fixed reduction part (31) is in contact and prevents rotation, the elastic reduction part (55), which is made of a flexible and elastic material, has frictional force between the wiping reduction surface (51) and the fixed reduction part (31), and a sliding motion occurs, causing an outward deformation, i.e., elastic deformation, of moving from the elastic reduction part (55') indicated by the dotted line to the position of the elastic reduction part (55), and the elastic reduction part (55) is made of a flexible and elastic material. Due to the characteristics, pressure is continuously applied in the direction of the fixed reduction part (31), and as the rotation angle changes, the rotation speed of the elastic reduction part (55) is reduced through the deceleration contact in which sliding occurs with friction between the wiping reduction surface (51) and the fixed reduction part (31) that receives the pressure of the elastic reduction part (55), thereby absorbing the shock between the wiping part (50) and the fixed part (30).

[0061] As shown in the cross-sectional view in (C) of Fig. 11, when the deceleration of the bending rotation of the wiping part (50) according to the second embodiment of the present invention is completed, the wiping part (50) rotates additionally with respect to the wiping blade (54) as wiping progresses compared to (B) of Fig. 11, and accordingly, additional bending rotation occurs with respect to the bending center point (41) of the bending part (40), and when the wiping part (50) rotates additionally in the opposite direction to the wiping progress direction, the elastic reduction part (55) rotates additionally with respect to the bending center point (41), but the fixed reduction part (31) contacts it and prevents the rotation, so that the elastic reduction part (55), which is a flexible and elastic material, undergoes additional elastic deformation moving outward at the top as the deceleration contact continues between the wiping reduction surface (51) and the fixed reduction part (31), and in this way, the rotation speed The elastic deceleration part (55) that has undergone deceleration stops rotating when the wiping stop part (52) comes into contact with the fixed stop part (32) of the fixed part (30), and at this time, the wiping contact part (53) is fixed at an appropriate wiping angle, so that the wiping blade (54) performs a wiping movement in the wiping progress direction.

[0062] In this process, the elastic reduction unit (55) reduces the rotational speed by decelerating contact, and the contact shock generated by the fixed stop unit (32) and the wiping stop unit (52) is also greatly alleviated. In addition, the rotation angle can be adjusted by adjusting the formation position of the fixed stop unit (32) or the wiping stop unit (52), and accordingly, the wiping angle corresponding to the rotation angle can also be adjusted to the most optimal angle for wiping.

[0063] <Third Embodiment>

[0064] As shown in Fig. 12, the rubber blade (20) according to the third embodiment of the present invention has a structure that reduces the reversal shock by reducing the reversal speed and maintains the optimal wiping angle. Looking at the structure in its natural state, a bending part (40) that performs a bending rotation is located 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, and a bending center point (41) that serves as the center of the bending rotation is located approximately at the center of the bending part (40).

[0065] An elastic reduction part (55) is formed and positioned on the upper part of the wiping part (50), a wiping reduction surface (51) is formed and positioned on the upper inner surface of the elastic reduction part (55), an angle maintenance part (56) is formed and positioned by connecting to the lower part of the wiping reduction surface (51), and a wiping stop surface (52) is formed and positioned by connecting to the lower part of the angle maintenance part (56).

[0066] In the fixed part (30), when the wiping part (50) rotates around the bending part (40), the wiping reduction surface (51) of the elastic reduction part (55) of the wiping part (50) rotates around the bending center point (41) and moves toward the fixed part (30) so that the fixed reduction part (31) is positioned in a protruding manner so that it comes into contact with the wiping reduction surface (51) at the first contact position.

[0067] All of the components formed in this way are formed 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 formed cross-section is formed to be long in the longitudinal direction, a completed rubber blade (20) as shown in Fig. 1 is formed.

[0068] As shown in the cross-sectional view in FIG. 13, the structure in which the wiping state of the rubber blade (20) according to the third embodiment of the present invention starts is as follows: when the wiping state starts, the pressure-applied wiping blade (54) comes into contact with the glass surface (70) and is fixed in a position by the wiping frictional force; when the fixed part (30) of the rubber blade (20) starts 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 rotation occurs around the bending center point (41) of the bending part (40), the wiping part (50) rotates in the opposite direction to the wiping progress direction, and the elastic reduction part (55) rotates around the bending center point (41), and the wiping reduction surface (51) of the elastic reduction part (55) moves toward the fixing part (31), so that the fixed part (30) It comes into contact with the fixed reduction gear (31) first.

[0069] At this time, when the wiping part (50) rotates by a rotation angle a, the elastic reduction part (55) of the wiping part (50) also moves by a rotation angle a around the bending center point (41), and then the wiping reduction surface (51) comes into contact with the fixed reduction part (31), and the wiping contact part (53) of the wiping part (50) tilts by a wiping angle a' with respect to the glass surface (70) around the wiping blade (54), and the wiping part (50) begins to rotate by bending until the optimal wiping angle is reached.

[0070] As shown in the cross-sectional view in FIG. 14, looking at the structure of the wiping state in which the shock absorption of the reverse rotation of the wiping part (50) of the rubber blade (20) according to the third embodiment of the present invention begins, as the wiping part (50)'s wiping rotation that started in FIG. 13 progresses to FIG. 14, the wiping part (50) undergoes additional rotation around the wiping blade (54), and accordingly, additional rotation occurs around the wiping center point (41) of the wiping part (40), so that the wiping part (50) rotates by the rotation angle b of FIG. 14 in the opposite direction of the wiping progress direction, and the elastic reduction part (55) rotates around the wiping center point (41) and must rotate to the position of the elastic reduction part (55') indicated by the dotted line, but the fixed reduction part (31) is in contact and prevents the rotational movement, so the elastic reduction part (55) made of a flexible and elastic material When a sliding motion, which is a deceleration contact with friction, occurs between the wiping deceleration surface (51) and the fixed deceleration part (31), an outward deformation, i.e., elastic deformation, occurs so that the elastic deceleration part (55') indicated by the dotted line moves to the position of the elastic deceleration part (55), and the wiping angle b' is formed corresponding to the rotation angle b.

[0071] If we look closely at the deceleration contact movement that occurs between the above-mentioned wiping deceleration surface (51) and the fixed deceleration part (31), the elastic deceleration part (55) that has undergone outward deformation continuously applies pressure toward the fixed deceleration part (31) due to the characteristics of the material that is flexible and elastic, and elastic deformation occurs in which the elastic deceleration part (55) that has undergone outward deformation is deformed. As the rotation angle changes, the rotation speed of the elastic deceleration part (55) is decelerated through the deceleration contact that causes sliding with friction between the wiping deceleration surface (51) and the fixed deceleration part (31) that receives the pressure of the elastic deceleration part (55) that has undergone elastic deformation, thereby absorbing the shock between the wiping part (50) and the fixed part (30).

[0072] At this time, between the wiping deceleration surface (51) of the elastic deceleration surface (55) of the wiping portion (50) and the fixed deceleration surface (31) of the fixed portion (30), the reaction force against the elastic force generated by the outward elastic deformation of the elastic deceleration surface (55) continuously applies force to the wiping deceleration surface (51) toward the fixed deceleration surface (31), and by appropriately adjusting the shape and length of the wiping deceleration surface (51) and the shape and position of the fixed deceleration surface (31), the frictional force generated between the wiping deceleration surface (51) and the fixed deceleration surface (31) can be increased, so that the deceleration contact is smoothly completed and the bending rotation of the wiping portion (50) is finished, and the wiping motion can be set to proceed while maintaining the wiping angle b' corresponding to the rotation angle b at which the bending rotation ends.

[0073] As shown in the cross-sectional view in FIG. 15, if we look at the structure of the wiping state in which the shock of the reverse rotation of the wiping part (50) of the rubber blade (20) according to the third embodiment of the present invention is absorbed, as the wiping part (50) additionally rotates, the wiping part (50) rotates additionally around the wiping blade (54) compared to FIG. 14, and accordingly, an additional rotation occurs around the center point of the bending point (41) of the bending part (40), and when the wiping part (50) rotates by the rotation angle c of FIG. 15 in the opposite direction of the wiping progress direction, the elastic reduction part (55) rotates additionally around the center point of the bending point (41), but the fixed reduction part (31) contacts it and prevents the rotation, so the elastic reduction part (55), which is made of a flexible and elastic material, moves upwardly outward while the decelerating contact continues between the wiping reduction surface (51) and the fixed reduction part (31). Additional elastic deformation occurs, and the rotational speed of the elastic reduction part (55) is reduced through a deceleration contact in which frictional sliding occurs between the wiping reduction surface (51) and the fixed reduction part (31) that receives the pressure of the elastic reduction part (55) where elastic deformation has occurred, and the impact between the wiping part (50) and the fixed part (30) is continuously absorbed, thereby performing a bending rotation.

[0074] At this time, as in Fig. 14, the reaction force against the elastic force generated by the outward elastic deformation of the elastic reduction part (55) between the wiping reduction surface (51) of the elastic reduction part (55) of the wiping part (50) and the fixed reduction part (31) of the fixed part (30) continuously applies force to the wiping reduction surface (51) toward the fixed reduction part (31), and by appropriately adjusting the shape and length of the wiping reduction surface (51) and the shape and position of the fixed reduction part (31), the frictional force generated between the wiping reduction surface (51) and the fixed reduction part (31) can be increased so that the deceleration contact is smoothly completed and the bending rotation of the wiping part (50) is finished, and the wiping movement can be set to proceed while maintaining the wiping angle c' corresponding to the rotation angle c at which the bending rotation ends.

[0075] As shown in the cross-sectional view in FIG. 16, when looking at the structure of the wiping state in which the reverse shock of the bending rotation of the wiping part (50) of the rubber blade (20) according to the third embodiment of the present invention is absorbed, as the bending rotation of the wiping part (50) is additionally performed, the wiping part (50) rotates additionally around the wiping blade (54) than in FIG. 15, and accordingly, an additional bending rotation occurs around the bending center point (41) of the bending part (40), and when the wiping part (50) rotates by the rotation angle e of FIG. 16 in the opposite direction of the wiping progress direction, the elastic reduction part (55) rotates additionally around the bending center point (41), but the fixed reduction part (31) contacts it and prevents the rotation, so the elastic reduction part (55), which is made of a flexible and elastic material, moves upwardly outward while the decelerating contact continues between the wiping reduction surface (51) and the fixed reduction part (31). Additional elastic deformation occurs, and the angle maintenance part (56) of the elastic reduction part (55) whose rotational speed has been reduced in this way comes into contact with the fixed stop part (32) of the fixed part (30) to stop the rotation, and at this time, the wiping contact part (53) is fixed and maintained at an appropriate wiping angle e', and the wiping blade (54) performs a wiping movement in the wiping direction.

[0076] In this process, the elastic reduction unit (55) reduces the rotational speed due to the reduction contact, and the contact shock generated between the fixed stop unit (32) and the angle maintenance unit (56) is also greatly alleviated. In addition, by adjusting the formation position of the angle maintenance unit (56) between the wiping reduction surface (51) and the wiping stop surface (52), the value of the rotation angle e can be adjusted, and accordingly, the wiping angle e' corresponding to the rotation angle e can also be adjusted to the most optimal angle for wiping.

[0077] As shown in FIG. 17, when the reverse movement in the wiping state of the rubber blade (20) according to the third embodiment of the present invention is completed and the wiping movement is in progress, the state in which the wiping angle is restored to the optimal angle is shown in 1) of FIG. 17, in the case of the rubber blade (20) receiving a counter pressure higher than the pressure of the wiper arm (not shown), the bending rotation of the wiping part (50) progresses up to the wiping angle d', and the fixed reduction part (31) of the fixed part (30) receives the counter pressure and moves in decelerating contact to the wiping stop surface (52) formed by connecting to the lower end of the angle maintaining part (56) of the wiping part (50), so that the elastic reduction part (55') of the wiping part (50) is elastically deformed outward and moves to the position of the elastic reduction part (55), and an appropriate maximum elastic deformation is achieved that matches the thickness of the appropriate elastic reduction part (55). The bending rotation due to the counter pressure is stopped. At this time, the elastic reduction part (55') indicated by the dotted line undergoes elastic deformation and moves to the position of the elastic reduction part (55), and has an elastic restoring force as a counter force. In other words, the bending rotation is stopped when the elastic restoring force and the counter pressure are offset.

[0078] When the counter pressure is canceled and only the pressure of the wiper arm (not shown) smaller than that remains, as in 2) of FIG. 17, the elastic restoring force that causes the elastic reduction part (55) of the wiping part (50) to move inward acts, so that the elastic reduction part (55) moves inward, and the fixed reduction part (31) of the fixed part (30) is positioned on the angle maintaining part (56) of the elastic reduction part (55), and the wiping angle of the wiping part (50) changes to the optimal angle e', and wiping proceeds while exhibiting the optimal wiping performance.

[0079] 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 for a vehicle, 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 configured to bend and rotate; and a fixing part connected to the bending part and configured to fix a rotation angle of the wiping part, wherein a wiping stop part is formed on the upper part of an elastic reduction part formed and positioned on the upper part of the wiping part, a wiping reduction surface is formed and positioned on the lower inner side of the wiping stop part, and when the wiping part bends and rotates around the bending part, a fixed reduction surface is formed and positioned at a point where the wiping reduction surface moves and meets the fixing part, wherein when the wiping part bends and rotates around the bending part and the wiping reduction surface of the elastic reduction part and the fixed reduction surface of the fixing part first come into contact, when a change in rotation angle progresses, a rubber blade formed such that the wiping reduction surface and the fixed reduction surface continue to be in decelerating contact.

2. A rubber blade in which a fixed stop part is formed protruding outwardly on the upper part of the fixed reduction part of the fixed part in claim 1.

3. A rubber blade of a wiper blade for a vehicle, 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 configured to bend and rotate; and a fixing part connected to the bending part and configured to fix a rotation angle of the wiping part, wherein a wiping reduction surface is formed and positioned on the upper part of the inner surface of an elastic reduction part formed and positioned on the upper part of the wiping part; a wiping stop part is protrudingly formed and positioned on the lower part of the wiping reduction surface; a fixed reduction surface is formed and positioned at a point where the wiping reduction surface moves and meets the fixing part when the wiping part bends and rotates around the bending part; and a fixed stop part is formed inwardly at the lower part of the fixed reduction part, wherein the rubber blade is formed such that when the wiping part bends and rotates around the bending part and the wiping reduction surface of the elastic reduction part and the fixed reduction part of the fixing part first come into contact with each other and then, when a change in rotation angle progresses, the wiping reduction surface and the fixed reduction part are in continuous decelerating contact.

4. A rubber blade formed so that when the rotation angle changes after the wiping part in claim 1 and claim 3 is rotated around the bending part and the wiping reduction surface of the elastic reduction part and the fixed reduction part of the fixed part first come into contact, the elastic reduction part undergoes elastic deformation in the outward direction of the fixed reduction part.

5. A rubber blade of a wiper blade for a vehicle, 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 rotation, and a fixing part connected to the bending part and fixing a rotation angle of the wiping part, wherein a wiping reduction surface is formed and positioned on the upper part of the inner surface of an elastic reduction part formed and positioned on the upper part of the wiping part, an angle maintaining part is formed and positioned on the lower part of the wiping reduction surface, a wiping stop surface is formed and positioned on the lower part of the angle maintaining part, and a fixed reduction part is protruded and positioned at a point where the elastic reduction part moves and first meets the fixing part when the wiping part performs a bending rotation, wherein the wiping part performs a bending rotation around the bending part, so that the wiping reduction surface of the elastic reduction part and the fixed reduction part of the fixing part come into contact, and as the bending rotation of the wiping part continues, the wiping reduction surface of the elastic reduction part and the fixed reduction part of the fixing part come into decelerating contact, and the elastic force of the elastic reduction part and A rubber blade formed so that the bending rotation is stopped by the frictional force between the above-mentioned wiping reduction surface and the above-mentioned fixed reduction portion, and the wiping portion is formed so that the bending rotation is stopped when the wiping reduction surface of the elastic reduction portion and the above-mentioned fixed reduction portion come into decelerating contact with each other, and the angle-maintaining portion of the elastic reduction portion comes into positional contact with each other, and the wiping portion is formed so that the bending rotation is stopped when the wiping reduction surface of the elastic reduction portion and the above-mentioned fixed reduction portion come into positional contact with each other, and the bending rotation is stopped when the wiping stop surface of the elastic reduction portion comes into positional contact with each other, and the angle-maintaining portion of the elastic reduction portion comes into positional contact with each other by the elastic restoring force of the above-mentioned elastic reduction portion.

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