JP2017217946A - Blade rubber, and wiper blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade rubber capable of appropriately wiping a surface to be wiped even after use for a long time.SOLUTION: A lengthy blade rubber 20 comprises: a head part 22 supported by a holder 12; and a wiping part 21 for wiping a surface S to be wiped for a vehicle C. The wiping part 21 has a thickness that is uniform over the whole length in a width direction orthogonal to a longitudinal direction, and comprises an expanding width part 30 for smoothly increasing the thickness in the width direction according to an increase or decrease of a pressing force on the surface S to be wiped in the longitudinal direction when pressed onto the surface S to be wiped by a wiper arm 11 through the holder 12.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a blade rubber that is attached to a wiper arm of a vehicle and wipes a wiping surface, and a wiper blade including the blade rubber.

  Conventionally, in order to wipe a wiping surface such as a windshield of a vehicle, it is widely known to use a wiper blade having a long blade rubber for wiping the wiping surface. In such wiper blades, there is a type in which a vertebra as a long spring plate member curved in a bow shape is provided to bend the blade rubber and is connected to a vehicle wiper arm via an attachment mechanism provided at an intermediate position thereof. Yes (see, for example, Patent Document 1).

  In this wiper blade, the pressing force received from the wiper arm is evenly distributed in the longitudinal direction by the vertebra provided on the blade rubber, and the blade rubber (wiping part) is wiped with a substantially uniform force over its entire length. Press against the surface. For this reason, as the wiper arm reciprocates, the blade rubber (wiping part) reciprocates on the wiping surface, thereby wiping the wiping surface well.

Special Table 2002-53325

  However, when the wiper blade having the above-described configuration is used, judder (buzzing noise) is generated, or wiping residue in the vicinity of the intermediate position of the blade rubber is generated. This is considered to be because the manner of wear near the intermediate position is different from other positions in the blade rubber wiping portion.

  This invention is made | formed in view of said problem, and makes it a subject to provide the blade rubber which can wipe a wiping surface appropriately even if it is using.

  The blade rubber of the present invention is a long blade rubber including a head supported by a holder and a wiping portion for wiping a wiping surface of a vehicle, and the wiping portion is orthogonal to the longitudinal direction. The thickness in the width direction is uniform over the entire length, and the width direction according to the increase / decrease of the pushing force to the wiping surface in the long direction when pressed against the wiping surface by the wiper arm through the holder It is characterized by having a widened portion that smoothly increases the thickness at.

  According to the blade rubber of the present invention, the wiping surface can be appropriately wiped even when used.

It is a typical perspective view showing vehicle C equipped with wiper blade 10 provided with blade rubber 20 of Example 1 concerning one embodiment of blade rubber concerning the present invention. 1 is a schematic perspective view showing a wiper blade 10. FIG. FIG. 3 is an explanatory view showing the structure of the wiper blade 10 in an exploded manner. FIG. 4 is a schematic perspective view showing a state in which the blade rubber 20 is viewed from the rear side in the traveling direction in the return path B, and shows the vicinity of the intermediate position partially enlarged. It is explanatory drawing which shows a mode that the holder 12 was provided in the cross section obtained along the II line | wire shown in FIG. It is explanatory drawing which shows a mode that the holder 12 was provided in the cross section obtained along the II-II line | wire shown in FIG. It is a graph which shows the pushing force P (g) to the wiping surface S in each position in the elongate direction of the wiping part 21, a vertical axis | shaft is made into pushing force P (g), and a horizontal axis is a blade in a elongate direction. The length is L (mm) with the center of the rubber 20 as the origin. It is explanatory drawing which shows a mode that the blade rubber 20 inclines in the inward path B. FIG.

  Hereinafter, a first embodiment in which a blade rubber 20 as an example of a blade rubber according to the present invention is applied to a wiper blade 10 as an example of a wiper blade will be described with reference to the drawings. 2 schematically shows a state in which the wiper blade 10 is in a flat state in order to facilitate understanding of the configuration of the wiper blade 10. In FIG. 4, in order to facilitate understanding of the configuration of the blade rubber 20, A mode that it was made into the flat state is shown typically. 2, 3, and 4, in order to facilitate understanding of the configuration of the widened portion 30, the protruding mode is emphasized and does not necessarily match the actual mode or other drawings.

  First, an overall configuration of a wiper using the wiper blade 10 including the blade rubber 20 of the first embodiment will be described. As shown in FIG. 1, the wiper blade 10 is attached to a wiper arm 11 provided in the vehicle C so that the windshield of the vehicle C serves as a wiping surface S. The wiper arm 11 is connected to a wiper motor provided in the vehicle C via a wiper link, and can be reciprocated along the wiping surface S by driving the wiper motor (see arrows G and B). Further, the wiper arm 11 has a function of pressing the wiper blade 10 (its blade rubber 20) attached via the attachment mechanism 13 and the holder 12 against the wiping surface S as will be described later.

  When the wiper arm 11 is reciprocated, the wiper blade 10 is reciprocated along the wiping surface S so that the width direction intersecting the longitudinal direction of the wiper arm 11 and the wiper blade 10 is a traveling direction. The wiping surface S is wiped off. In the first embodiment, in the reciprocating movement, a direction in which the wiper blade 10 moves from the lower side of the wiping surface S, which is the stationary posture of the wiper blade 10, to the upper and rear sides of the vehicle C along the wiping surface S is defined as an outward path G. A direction in which the vehicle C moves downward and forward along the wiping surface S is defined as a return path B. Here, on the wiping surface S, due to the relative flow of air accompanying the traveling of the vehicle C, a traveling wind W along the outer contour of the vehicle C is generated when viewed from the vehicle C side. In the first embodiment, since the wiping surface S is the windshield of the vehicle C, the traveling wind W is directed from the front of the vehicle C to the rear on the wiping surface S. For this reason, the wiper blade 10 moves on the wiping surface S while receiving the traveling wind W on the back in the forward path G, and moves on the wiping surface S against the traveling wind W in the return path B.

  As shown in FIGS. 2 and 3, the wiper blade 10 includes a blade rubber 20 for wiping the wiping surface S, a holder 12 for supporting the wiper surface S, and an attachment mechanism 13 for attaching the holder 12 to the wiper arm 11. .

  The blade rubber 20 is formed of an elastic member that can wipe the wiping surface S without damaging the wiping surface S, and has a long shape. As shown in FIGS. 4 and 5, the blade rubber 20 has a wiping portion 21 addressed to the wiping surface S, a head 22 positioned above the wiping portion 21, and a width narrower than the head 22. It has the neck part 23 which connects the said head part 22 and the wiping part 21, and a pair of flange part 24 which protrudes from the neck part 23 in the width direction. The cross-sectional shape of the wiping portion 21 has a substantially inverted triangular shape, and the cross-sectional shape of the head portion 22 has a rectangular shape. The neck portion 23 forms a recess between the wiping portion 21 and the head portion 22, and the flange portion 24 protrudes from the neck portion 23 in parallel with the lower surface of the head portion 22. The wiping portion 21 has a flexible portion 25 whose lower portion (tip portion) can be bent and deformed, touches the wiping surface S at the wiping portion 26 at the lower end, and the wiping portion 26 wipes the wiping surface S. The blade rubber 20 has a so-called neck reversal structure having the above-described shape.

  When the blade rubber 20 is reversed while being pressed against the wiping surface S by the wiper arm 11, that is, when the moving direction on the wiping surface S is changed to the opposite side (the return path G and the return path B are turned back). The flexible portion 25 is curved so as to follow the wiping surface S while the neck portion 23 is curved. At this time, the contact portion 27 positioned at the upper end of the wiping portion 21 is in contact with the corresponding flange portion 24 (the lower surface thereof) and the bending of the neck portion 23 is restricted, whereby the tilt angle θi of the flexible portion 25 with respect to the wiping surface S. Is appropriate, and the contact state of the wiping location 26 with the wiping surface S is appropriate (see FIG. 8). The vertebra 14 is attached to the head 22 of the blade rubber 20.

  The vertebra 14 is a spring plate member formed in a long plate shape extending from a synthetic resin material or a metal material having elasticity with a constant cross-sectional shape, and has a bow-shaped shape with respect to the long direction (FIG. 3). reference). The vertical bar 14 has a function of dispersing this force and equalizing in the longitudinal direction when the central portion 14a in the longitudinal direction is pushed down to be flattened. The vertebra 14 is attached to the blade rubber 20 by being provided by being inserted into each of the pair of grooves 22 a provided in the head 22. The head 22 is accommodated and supported by the holder 12.

  The holder 12 is formed of an elastic material such as rubber or a synthetic resin material, and is a long cylindrical body extending in a constant cross-sectional shape as shown in FIGS. Has a slightly long shape. The holder 12 has a blade rubber insertion space 12a and a slit 12b. The blade rubber insertion space 12a is constituted by the inner wall surface of the holder 12, has a rectangular parallelepiped shape extending in the longitudinal direction of a certain rectangular cross section, and the head 22 of the blade rubber 20 provided with a pair of vertebras 14 is extended to the full length. Crossing is acceptable (see FIG. 4). The blade rubber insertion space 12a opens both end faces 12c of the holder 12, and the slit 12b is positioned below. The slit 12b is formed by cutting out the lower wall portion of the holder 12 along the extending direction of the holder 12 while maintaining a constant interval, and opens (opens) the blade rubber insertion space 12a downward. The lower wall portion opened by the slit 12b, that is, the peripheral portion of the slit 12b becomes a pair of support portions 12d capable of sandwiching the head 22 of the blade rubber 20 below the pair of vertebras 14.

  When the head 22 of the blade rubber 20 is inserted into the blade rubber insertion space 12a, the holder 12 supports the head 22 and the pair of vertebras 14 provided thereon (see FIG. 5 and the like). . Thereby, the blade rubber 20 is prevented from falling downward from the blade rubber insertion space 12 a of the holder 12. On the upper surface of the holder 12, an inclined surface portion 12e and a rib portion 12f are provided. The inclined surface portion 12e continues to the root of the rib portion 12f while rising at a constant gradient from one side end (front side in the traveling direction in the return path B) of the upper surface of the holder 12 to the other side end. It protrudes upward so that the side edge is the highest. The inclined surface portion 12e and the rib portion 12f generate a force that presses against the wiping surface S by flowing smoothly while receiving the traveling wind W when traveling on the return path B against the traveling wind W. The influence of the force (the lifting force from the wiping surface S) to be peeled off from the wiping surface S by W is negated.

  An attachment mechanism 13 is attached to the central portion 12 g of the holder 12. The attachment mechanism 13 includes a clip base 13a attached to the holder 12, and a clip 13b provided rotatably on the clip base 13a. The clip base 13a has a width dimension substantially equal to the upper wall portion of the holder 12, and has a shape that covers both side walls of the holder 12 from the outside while following the shapes of the inclined surface portion 12e and the rib portion 12f. The clip 13b is rotatably supported by a shaft portion spanned on the clip base 13a, and the distal end portion 11a of the wiper arm 11 can be fixed and released.

  In the holder 12, stoppers 15 are attached to both ends (end surface 12c) (see FIGS. 2 and 3). As shown in FIG. 2, each stopper 15 covers both end portions (end surface 12c) of the holder 12 in a state where the holder 12 supports the blade rubber 20 (the head portion 22), and the blade rubber insertion space 12a and the inside thereof. To prevent the head 22 and the like from being exposed. Thereby, each stopper 15 prevents the blade rubber 20 from falling off from each end face 12c of the holder 12 to the outside, and improves the design of the appearance of each end (end face 12c).

  The wiper blade 10 is assembled by housing a head portion 22 of a blade rubber 20 to which a pair of vertebra 14 is attached in a holder 12 (the blade rubber insertion space 12a), and attaching each stopper 15 and the attachment mechanism 13. The wiper blade 10 is mounted on the vehicle C by connecting a wiper arm 11 (its tip 11a) to an attachment mechanism 13 (its clip 13b) (see FIG. 1). At this time, the wiper blade 10 is pressed against the wiping surface S by the wiper arm 11 via the attachment mechanism 13 and the holder 12. Then, in the wiper blade 10, the attachment mechanism 13 is provided at the central portion 12 g of the holder 12. Therefore, when the wiper arm 11 is pressed against the wiping surface S, the central portion 20 a in the longitudinal direction of the blade rubber 20 is pushed down. For this reason, in the blade rubber 20, when the center portion 20a is pushed down and flattened by the pair of vertebras 14 provided on the head portion 22, the wiping portion 21 (wiping portion 26) extends over the entire length while the force is dispersed. It is pressed against the wiping surface S. Accordingly, the wiper blade 10 is reciprocated by the wiper arm 11, so that the wiping portion 21 (wiping location 26) of the blade rubber 20 is reciprocated along the wiping surface S to wipe the wiping surface S. .

  Here, the problem of the conventional wiper blade will be described. This problem has the same problem even if the wiper blade 10 of the first embodiment is not provided with the widened portion 30 described later, and will be described using the wiper blade 10. When the wiper blade 10 is used, judder (buzzing noise (continuous abnormal noise accompanying the wiping of the wiping surface S by the blade rubber 20)) is generated or wiping residue in the vicinity of the central portion 20a of the blade rubber 20 is left. It occurs. This is considered to be because, in the wiping portion 21 (the wiping location 26) of the blade rubber 20, the manner of wear near the intermediate position is different from the manner of wear at other positions. The cause of such uneven wear can be considered as follows. In the blade rubber 20, when the central portion 20a is pushed down and flattened by the pair of vertebras 14 provided on the head 22, the wiping portion 21 (wiping location 26) is wiped over the entire length while the force is dispersed. Pressed against. Here, both the vertebras 14 have the above-described functions (disperse the force), but the pressing force P (partial pressure) on the wiping surface S at each position in the longitudinal direction of the wiping portion 21 (wiping location 26). It is difficult to make the distribution (see FIG. 7) completely uniform. As shown in FIG. 7, the pressing force P is partially greater in the vicinity of the central portion 20a pushed down by the wiper arm 11 than in other positions in the longitudinal direction. The mode of distribution of the part where the pushing force P is partially large is substantially bilaterally symmetric about the center position in the longitudinal direction of the blade rubber 20 (wiping part 21 (wiping part 26)). The range is a range of a predetermined length La toward both ends, and the pressing force P at the center position is the highest, and the pressing force P gradually decreases toward both ends.

  Here, in the blade rubber 20, when pressed from the wiper arm 11 to the wiping surface S, the contact portion 27 of the wiping portion 21 is in contact with the corresponding flange portion 24 (the lower surface thereof), and the bending of the neck portion 23 is regulated. Therefore, the tilting angle θi is appropriate with respect to the wiping surface S of the wiping portion 21 (the flexible portion 25). However, in the blade rubber 20, when the pressing force P at each position in the longitudinal direction changes, the force with which the contact portion 27 of the wiping portion 21 presses the corresponding flange portion 24 (the lower surface thereof) changes, and the flexibility. The degree of curvature of the portion 25 also changes. Then, in the blade rubber 20, the inclination angle θi of the wiping portion 21 (its flexible portion 25) with respect to the wiping surface S deviates from an appropriate one in the vicinity of the central portion 20a, and the wiping surface S is wiped in this state. Thus, the manner of wear differs between the intermediate position and other positions. Such uneven wear tends to occur as the force for pressing the wiper arm 11 against the wiping surface S is set larger.

  On the other hand, in view of the above, the blade rubber 20 of the present invention has the following configuration. In the blade rubber 20, as shown in FIGS. 4 to 6, the widened portion 30 is provided in the central portion 20 a of the wiping portion 21. The widened portion 30 partially increases the thickness in the width direction of the wiping portion 21 in accordance with the increase or decrease of the pressing force P that partially increases. In the first embodiment, the wiping surface S in the forward path G is used. It is provided on the rear side in the advancing direction and on the rear side in the advancing direction on the wiping surface S in the return path B. This is because the above-described uneven wear is observed at the wiping portion 26 in contact with the wiping surface S in both the forward path G and the backward path B. The widened portion 30 may be provided on only one of the rear side in the traveling direction on the wiping surface S in the forward path G and the backward path B depending on how the wear is biased, and is limited to the configuration of the first embodiment. Not. In the widened portion 30, the increase in thickness with respect to increase / decrease in the pressing force P is determined according to the material (characteristics) of the blade rubber 20, the setting of the vertebra 14 (shape, material, etc.) and the pressing force from the wiper arm 11. Set. In addition, although the wide part 30 is provided in the both sides seen in the width direction of the wiping part 21 as mentioned above, it is the mutually same structure except the provided position (projecting direction) differing. For this reason, FIG. 4 which shows the whole structure of the wide part 30, FIG. 8 which shows a mode that it wipes, and description using them use only one (return path B), but a structure and an effect | action are also in the other (outward path G). It is the same.

  As shown in FIG. 4, each widened portion 30 is provided in a range of length Ls from the center of the wiping unit 21 in the longitudinal direction to both sides (a range of 2 Ls in total), and the thickness in the width direction is The increasing mode is made symmetrical on both sides in the longitudinal direction with the center of the wiping portion 21 as the center. The entire length 2Ls of each widened portion 30 is equal to a predetermined length La indicating a range in which the pressing force P is partially increased in the wiping portion 21 (wiping portion 26) of the blade rubber 20. Each widened portion 30 has a surface having a uniform thickness of the wiping portion 21 excluding the widened portion 30 as a reference surface 21a, and is thickened in a sine curve from the reference surface 21a according to the increase or decrease of the pressing force P. The thickness of the wiping portion 21 is smoothly changed with a continuous smooth curved surface so that the thickness becomes the largest at the center of the wiping portion 21 while changing the. For this reason, each widening part 30 is the area | region where pushing force P is increasing in the wiping part 21 (wiping location 26), and the thickness of the wiping part 21 according to the change (the ratio) of the pushing force P It is changing.

  As shown in FIG. 6, each widened portion 30 increases or decreases the overall thickness of the wiping portion 21, and an area increasing portion 31 that continues to the contact location 27 and a deflection suppression portion that continues to the flexible location 25. 32. Each area increasing portion 31 has a positional relationship in which the contact portion 27 is in contact with the flange portion 24 (lower surface) at the same time (adjacent) next to the contact portion 27 when the contact portion 27 is in contact with the flange portion 24 (lower surface). 21 is increased in contact area with the flange portion 24 (lower surface) (see FIG. 8). Each bending suppression portion 32 increases the thickness of the flexible portion 25 and suppresses bending deformation of the flexible portion 25. For this reason, in each widening part 30 of Example 1, setting the thickness of the area increase part 31 from a viewpoint of increasing a contact area, and setting the thickness of the bending suppression part 32 from a viewpoint of suppression of a bending deformation. The thickness may be different depending on the position in the vertical direction or may be constant.

  In the first embodiment, since the widened portions 30 are provided on both sides of the wiping portion 21 as viewed in the width direction, the deflection suppressing portions 32 exist on both sides of the flexible portion 25 and the flexible portion 25 is bent and deformed. Is suppressed more strongly. For this reason, the deflection suppressing portion 32 depends on the material (characteristics) of the blade rubber 20, the setting of the vertebra 14 (shape, material, etc.) and the pressing force from the wiper arm 11, but compared to the case where it is provided only on one side. The increase in thickness can be reduced.

  Next, the operation of the blade rubber 20 (wiper blade 10) of Example 1 will be described. When the blade rubber 20 is pressed from the wiper arm 11 to the wiping surface S in the return path B, the contact portion 27 of the wiping portion 21 comes into contact with the corresponding flange portion 24 (the lower surface thereof) and regulates the curvature of the neck portion 23. In this state, the flexible portion 25 is curved, so that the tilt angle θi with respect to the wiping surface S of the flexible portion 25 of the wiping portion 21 is appropriate. Here, in the wiping portion 21, the pushing force P to the wiping surface S is high in the vicinity of the central portion 20a as described above. A widened portion 30 is provided. For this reason, in the center part 20a of the wiping part 21, as shown in FIG. 8, when the contact part 27 contacts the flange part 24 (lower surface), the area increasing part 31 also contacts the flange part 24 (lower surface) together. The contact area with the flange portion 24 (lower surface) is increased in proportion to the increase in the pressing force P. Moreover, in the center part 20a of the wiping part 21, since the bending deformation | transformation (the extent) of the flexible location 25 with respect to the force provided by providing the bending | flexion suppression part 32 is suppressed, the increase in pressing force P is carried out. In proportion, the ease of bending of the flexible portion 25 is suppressed. Therefore, in the wiping portion 21, the inclination angle θi with respect to the wiping surface S of the wiping portion 21 (its flexible portion 25) is appropriate over the entire length regardless of the change in the pressing force P at each position in the longitudinal direction. Become. For this reason, in the blade rubber 20 (wiper blade 10), even if the pushing force P at each position in the longitudinal direction from the wiper arm 11 is distributed as shown in FIG. The tilt angle θi of the flexible portion 25) with respect to the wiping surface S can be made constant.

  In the blade rubber 20 according to the first embodiment of the present invention, the following effects can be obtained.

  In the blade rubber 20, the pressing force P applied to the wiping surface S at each position in the longitudinal direction of the wiping portion 21 (wiping portion 26) is applied to the wiping portion 21 having a uniform thickness in the width direction over the entire length. A widened portion 30 that smoothly increases the thickness in the width direction is provided in accordance with the increase or decrease. For this reason, in the blade rubber 20, since the wiping part 21 can be made difficult to fall with respect to the wiping surface S according to the thickness which the widened part 30 increased, it is in the change of the pressing force P in each position in a elongate direction. Regardless, the tilt angle θi with respect to the wiping surface S of the wiping portion 21 (its flexible portion 25) can be made constant over the entire length. Thereby, in the blade rubber 20, the contact state of the wiping place 26 with respect to the wiping surface S can be made constant over the entire length regardless of the change of the pressing force P at each position in the longitudinal direction, and the wiping surface S is wiped off. By doing so, the wear mode can be made uniform. Therefore, even if the blade rubber 20 is used, it is possible to prevent judder (buzzing noise) and unwiping from the vicinity of the central portion 20a, thereby improving durability and wiping surface S. Can be wiped off properly. This is particularly effective because the bias of wear tends to occur when a large pressing force from the wiper arm 11 to the wiping surface S is set.

  In the blade rubber 20, the thickness of the wiping portion 21 is a continuous smooth curved surface so that the widening portion 30 has the largest thickness at the center of the wiping portion 21 while changing the thickness from the reference surface 21a to a sine curve. Change smoothly. For this reason, in the blade rubber 20, in the wiping part 21, it can prevent that a local stress generate | occur | produces between the wide part 30 (the surface) and other parts (reference surface 21a). Thereby, in the blade rubber 20, it can prevent that intensity | strength (rigidity) falls resulting from providing the wide part 30, and even if it is using, the wiping surface S can be wiped off appropriately. Further, in the blade rubber 20, the widened portion 30 can be formed into a smooth shape while bringing the increase in thickness close to the change in the pushing force P (partial pressure distribution), and the wiping portion 21 can be appropriately formed with a simple configuration. It is possible to prevent unevenness in the wear of the (wiping part 26).

  In the blade rubber 20, a widened portion 30 is provided in the central portion 20 a to which the wiper arm 11 is attached via the attachment mechanism 13 and the holder 12, and a mode of increasing the thickness in the width direction of the widened portion 30 in the longitudinal direction is provided. The center of the wiping portion 21 is symmetrical on both sides. For this reason, in the blade rubber 20, the widening portion 30 is adjusted in accordance with the increase / decrease (mode) of the pressing force P of the wiping portion 21 (wiping location 26) that is partially increased by being pressed from the wiper arm 11 to the wiping surface S. Can be provided. Thereby, in the blade rubber 20, it can prevent that the abrasion of the wiping part 21 (wiping location 26) is biased more appropriately with a simpler configuration.

  In the blade rubber 20, in the widened portion 30, the area increasing portion 31 increases the thickness of the contact portion 27 to increase the contact area with the flange portion 24 (lower surface) of the wiping portion 21, and the deflection suppressing portion 32 is flexible. The thickness of the portion 25 is increased to suppress the bending deformation of the flexible portion 25. For this reason, in the blade rubber 20, the contact portion 27 and the area increasing portion 31 are in contact with the flange portion 24 (lower surface) in the central portion 20 a, so that the flange portion 24 of the wiping portion 21 is proportional to the increase in the pressing force P. The contact area to the (lower surface) can be increased, and the curvature of the neck portion 23 can be made constant regardless of the change in the pressing force P over the entire length. Further, in the blade rubber 20, it is possible to suppress the ease of bending deformation (curving) of the flexible portion 25 with respect to the force applied with the bending suppressing portion 32 in proportion to the increase of the pressing force P in the central portion 20a. The bending of the flexible portion 25 can be made constant regardless of the change in the pushing force P over the entire length. Accordingly, in the blade rubber 20, regardless of the change in the pressing force P at each position in the longitudinal direction, the tilt angle θi with respect to the wiping surface S of the wiping portion 21 (its flexible portion 25) is further increased over the entire length. Can be constant.

  In the blade rubber 20, the area increasing portion 31 is formed by increasing the thickness of the wiping portion 21 in the widened portion 30. For this reason, in the blade rubber 20, since the area increasing portion 31 contacts the flange portion 24 (lower surface) at a position away from the contact portion 27 when viewed from the neck portion 23, the neck portion 23 is more appropriately prevented from being excessively curved. it can.

  In the blade rubber 20, the widened portion 30 is provided to protrude to the rear side in the traveling direction on the wiping surface S in the return path B, and the widened portion 30 is provided to project to the rear side in the traveling direction on the wiping surface S in the forward path G. That is, in the blade rubber 20, the widened portion 30 is provided so as to protrude on both the rear side and the front side in the traveling direction on the wiping surface S in the return path B (both sides viewed in the width direction). For this reason, in the blade rubber 20, it is possible to appropriately prevent the occurrence of uneven wear in the wiping location 26 where the wiping surface S is wiped in the return path B and the forward path G.

  In the blade rubber 20, since the widened portions 30 are provided on both sides of the wiping portion 21 as viewed in the width direction, the thickness of the deflection suppressing portion 32 can be reduced as compared with the case where the widened portions 30 are provided on only one of them. For this reason, in the blade rubber 20, compared with the case where it provides only in any one, it can be made a simpler structure and can suppress the bending deformation of the flexible location 25 appropriately, suppressing material.

  In the blade rubber 20, the widened portion 30 can be provided so as to protrude only on the rear side in the traveling direction on the wiping surface S in the return path B. For this reason, in the blade rubber 20, it is possible to appropriately prevent the occurrence of uneven wear at the wiping location 26 where the wiping surface S is wiped in the return path B that travels against the traveling wind W. Here, the blade rubber 20 is positioned in the vicinity of the lower end of the wiping surface S when the wiper blade 10 is not used, and is pressed against the wiping surface S while traveling in the return path B. Easy to become a habit. For this reason, in the blade rubber 20, the widening portion 30 is provided on the rear side in the traveling direction of the return path B, and the tilt angle θi with respect to the wiping surface S of the wiping portion 21 (its flexible portion 25) can be made constant over the entire length. This is also effective from this viewpoint. This is the same even when the widened portions 30 are provided on both sides of the wiping portion 21 as viewed in the width direction as in the first embodiment.

  In the blade rubber 20, the widened portion 30 can be provided so as to protrude only on the rear side in the traveling direction on the wiping surface S in the forward path G. For this reason, in the blade rubber 20, it is possible to appropriately prevent the occurrence of uneven wear in the wiping location 26 where the wiping surface S is wiped in the forward path G.

  In the blade rubber 20, a change in the pressing force P to the wiping surface S at each position in the longitudinal direction of the wiping portion 21 (wiping place 26) due to being pressed against the wiping surface S by the wiper arm 11 (its mode) ), The widened portion 30 is provided so as to increase the thickness of the wiping portion 21. For this reason, in the blade rubber 20, the widened portion 30 is appropriately provided even in a vehicle (C) of a different manufacturer or vehicle type by acquiring a region where the pressing force P is partially increased or a change mode thereof. Even if it is used, the wiping surface S can be wiped off appropriately.

  Since the wiper blade 10 of the first embodiment of the wiper blade according to the present invention includes the blade rubber 20 as an example of the blade rubber according to the present invention, the above-described effects can be obtained. Moreover, in the wiper blade 10, since the position and aspect of the attachment mechanism 13 in the holder 12 are known in advance, the widened portion 30 can be provided more appropriately and more easily, and the wiping surface S can be more appropriately used even when used. Can be wiped away.

  Therefore, even if the blade rubber 20 is used, the wiping surface S can be wiped appropriately.

  Although the blade rubber of the present invention has been described based on the first embodiment, the specific configuration is not limited to the first embodiment, and does not depart from the scope of the invention according to the claims and each claim. As long as the design is changed or added, it is allowed.

  In the first embodiment, the blade rubber 20 as an example of the blade rubber according to the present invention has been described. However, it is a long blade rubber comprising a head supported by a holder and a wiping portion for wiping the wiping surface of the vehicle, and the wiping portion has a thickness in the width direction orthogonal to the longitudinal direction. Is uniform over the entire length, and the thickness in the width direction is adjusted according to the increase or decrease of the pressing force on the wiping surface in the longitudinal direction when pressed against the wiping surface by the wiper arm through the holder. Any blade rubber having a widened portion that is smoothly increased may be used, and the configuration is not limited to that of the first embodiment.

  In the first embodiment, the blade rubber 20 has a neck reversal structure. However, the blade rubber 20 may have a so-called lip reversal structure that mainly uses the curvature of the flexible portion 25 and is not limited to the configuration of the first embodiment. Even with the blade rubber having such a lip reversal structure, the same effect can be obtained by providing the widened portion 30 as in the first embodiment.

  Furthermore, in Example 1, the example which used the blade rubber which concerns on this invention for the wiper blade 10 of the above-described structure was shown. However, any wiper blade may be used as long as the blade rubber is pressed against the wiping surface S by the wiper arm via the holder, and the configuration is not limited to that of the first embodiment.

  In the first embodiment, the wiping surface S is the windshield of the vehicle C. However, for example, a rear glass may be used, and other portions (other glass, headlamps, etc.) may be used, and the configuration is not limited to that of the first embodiment.

  In the first embodiment, the holder 12 is a long cylindrical body. However, any configuration may be used as long as it supports the head portion 22 of the blade rubber 20 in order to attach the blade rubber 20 to the wiper arm 11, and the configuration is not limited to that of the first embodiment. Further, in the first embodiment, the holder 12 supports the head 22 using the pair of vertebras 14, but the head 22 may be supported by wrapping the entire head 22. It may be present and is not limited to the configuration of the first embodiment.

  In the first embodiment, the pair of vertebras 14 is attached to the head 22 of the blade rubber 20. However, a long spring plate member (vertebra) curved in a bow shape having an equivalent function may be provided between the head 22 and the holder (12), and the holder (12) is provided with an equivalent function. Alternatively, the head 22 may have the same function and is not limited to the configuration of the first embodiment. In order to give the head 22 an equivalent function, for example, a long spring plate member (vertebra) having an equivalent function is embedded and a material and a shape are appropriately set. .

  In the first embodiment, the clip 13b is rotatably provided on the clip base 13a where the attachment mechanism 13 is attached to the holder 12. However, the blade rubber 20 supported by the holder and the wiper arm 11 may be connected, and the configuration is not limited to that of the first embodiment.

DESCRIPTION OF SYMBOLS 10 Wiper blade 11 Wiper arm 12 Holder 13 Mounting mechanism 14 Vertibra (as an example of a spring plate member) 20 Blade rubber 21 Wiping part 21a Reference surface 22 Head 23 Neck part 24 Flange part 25 Flexible part 26 Wiping part 27 Contact part 30 Widening portion 31 Area increasing portion 32 Deflection suppressing portion B Return path C Vehicle G Outward path P Pushing force S Wiping surface W Running wind θi Tilt angle

Claims (8)

A long blade rubber comprising a head supported by a holder and a wiping portion for wiping a wiping surface of a vehicle,
The wiping portion has a uniform thickness in the width direction orthogonal to the longitudinal direction over the entire length, and to the wiping surface in the longitudinal direction when pressed against the wiping surface by the wiper arm via the holder A blade rubber having a widened portion for smoothly increasing the thickness in the width direction in accordance with increase or decrease of the pressing force. In the head, the wiper arm is attached to the center in the longitudinal direction via the holder,
The widened portion is provided at the center of the wiping portion in the longitudinal direction, and the aspect of increasing the thickness in the width direction is symmetrical on both sides of the longitudinal direction with the center of the wiping portion as a center. The blade rubber according to claim 1.   The said widening part changes the thickness of the said wiping part in the shape of a sine curve from the said reference surface by making the surface of the location made into the uniform thickness in the said wiping part into a reference | standard surface. Item 3. The blade rubber according to Item 2. The blade rubber according to any one of claims 1 to 3,
Furthermore, a neck portion that connects the head portion and the wiping portion, and a flange portion that protrudes in the width direction from the neck portion,
The wiping portion is provided with a wiping portion that touches the wiping surface at a tip thereof so that the wiping portion can be bent and deformed, and a contact portion that contacts the flange portion so as to define an inclination angle of the flexible portion with respect to the wiping surface. And having
The widened portion includes an area increasing portion that is adjacent to the contact location and increases a contact area with the flange portion of the wiping portion, and a bending suppression portion that suppresses bending deformation of the flexible location. And blade rubber.   The widened portion is on the rear side in the traveling direction on the return path, with the direction against the traveling wind generated on the wiping surface as the vehicle travels when reciprocating in the width direction as the return path and the opposite direction as the forward path The blade rubber according to any one of claims 1 to 4, wherein the blade rubber is provided so as to protrude.   The widened portion is on the rear side in the traveling direction in the forward path, with the direction against the traveling wind generated on the wiping surface as the vehicle travels when reciprocating in the width direction as the return path and the opposite direction as the forward path The blade rubber according to any one of claims 1 to 5, wherein the blade rubber is provided so as to protrude.   The said wiping part is distributed in the elongate direction by the elongate spring board member in which the pressing force from the said wiper arm curved like a bow, and is pressed on the said wiping surface. The blade rubber according to any one of the above.   A wiper blade comprising: the blade rubber according to any one of claims 1 to 7, the holder, and an attachment mechanism for attaching the holder to the wiper arm.