JP5049622B2 - Wiper blade - Google Patents

Description

  The present invention relates to a wiper blade that is attached to the tip of a wiper arm and wipes a window glass of a vehicle.

Vehicles such as passenger cars, buses, and trucks are provided with wiper blades for wiping off water droplets adhering to the front window glass and rear window glass to ensure the driver's view. The wiper blade includes a rubber blade rubber and a rubber holder that holds the rubber blade rubber. The blade rubber is composed of a head portion having a holding groove with which a holding claw of the rubber holder engages, a lip portion for wiping the wind glass, and a neck portion for connecting the lip portion and the head portion (Patent Document). 1).
JP 2005-22632 A

  In the wiper blade, when the wind glass is wiped, the neck portion is bent and the shoulder of the lip portion is in contact with the head portion. For this reason, whenever the wiper arm is reversed, the shoulder of the lip portion collides with the head portion and generates an abnormal noise.

  An object of the present invention is to suppress the generation of abnormal noise when the wiper arm is reversed.

The wiper blade of the present invention is attached to the tip of the wiper arm that swings, and includes a rubber holder having a holding claw and a rod-shaped blade rubber held by the rubber holder, the blade rubber is pre composed of serial head portion which the holding claws is provided with a holding groove that engages when held by the rubber holder, a lip portion for wiping a window glass, a neck portion connecting the lip and the front SL head a wiper blade which is, the blade rubber is approaching a supporting point where the holding claws is supported by engaged by the rubber holder in the holding groove, the front Symbol lip of the wiping direction in both shoulders out and a projection for shock absorption provided, the projection is formed in the vicinity of the support points in the longitudinal direction of the blade rubber, the blade rubber, the holding Characterized in that it has a pair of stopper portions sandwiching the engaged the retaining pawl from opposite sides of the longitudinal direction.

The wiper blade of the present invention covers the front Symbol lip, characterized in that a contact with the valve head before Symbol projections before Symbol head.

  According to the present invention, when the wiper arm is reversed, the protrusion of the lip portion collides with the head portion, and this protrusion is deformed to absorb the impact, so that it is possible to suppress the generation of noise due to the collision between the two.

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

  FIG. 1 is a perspective view showing a two-point support wiper blade according to an embodiment of the present invention.

  The wiper blade 11 is attached to the tip of the wiper arm 13 of the vehicle 12. When the wiper arm 13 is driven to swing by a wiper motor (not shown), the wiper blade 11 swings together with the wiper arm 13 to move the windshield of the vehicle 12 (hereinafter referred to as wind glass). ) Wipe 14. The wiper blade 11 includes a blade rubber 15 that directly contacts the wind glass 14 and a rubber holder 16 that holds the blade rubber. A pair of covers 17 are detachably attached to both sides of the rubber holder 16 in the longitudinal direction. Yes.

  2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1, and FIGS. 4 (a) and 4 (b) show details of the holding portion shown in FIG. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 2, and FIG. 6 is a view for explaining the wiping operation of the window glass. In addition, illustration of the neck part 23 is abbreviate | omitted in FIG.

  The blade rubber 15 is made of a natural rubber or a synthetic rubber as a material and is formed in a bar shape having a uniform cross section in the longitudinal direction and having a head section 21 having a rectangular section, a lip section 22 and a neck section 23. 14 is contacted. The neck portion 23 is formed with a narrow width in the wiping direction with respect to the head portion 21 and the lip portion 22, whereby the lip portion 22 can be tilted in the wiping direction with respect to the head portion 21.

  The lip portion 22 protrudes from both shoulders 22a in the wiping direction of the wiper blade 11 to form protrusions 22b. The protrusion 22b is provided in a portion where the pressing force from the wiper arm 13 is transmitted, that is, in the vicinity of a portion where the rubber holder 16 supports the blade rubber 15 (see FIG. 5). The head portion 21 is provided with an umbrella portion 21b that covers the lip portion 22 and contacts the protrusion 22b. The umbrella part 21b is formed wider than the protrusion 22b, and is arranged so as to approach the window glass 14 toward the tip.

  Between the head portion 21 and the neck portion 23, there are formed holding grooves 24 that open on both side surfaces in the wiping direction and extend in the longitudinal direction, and mounting grooves 21a are formed in the longitudinal direction on both side surfaces of the head portion 21, respectively. It is formed to extend. A leaf spring member 25 is mounted in each of the mounting grooves 21a.

  The leaf spring member 25 is formed into a flat plate having a length similar to that of the blade rubber 15 by punching a plate material such as a steel plate, and is elastically deformable in a direction perpendicular to the wind glass 14, thereby The blade rubber 15 to which the leaf spring member 25 is attached is elastically deformable integrally with the leaf spring member 25 in a direction perpendicular to the window glass 14, that is, a direction in which the degree of curvature is changed. Further, the leaf spring member 25 is curved in a natural state in a direction in which the leaf spring member 25 can be elastically deformed so as to be stronger than the curvature of the window glass 14, so that the blade rubber 15 to which the leaf spring member 25 is attached also extends from the wind glass 14. In a separated state, it is curved more strongly than the wind glass 14. In the illustrated case, the leaf spring member 25 is formed of a steel plate. However, the present invention is not limited to this. For example, the leaf spring member 25 may be elastically deformable in a direction perpendicular to the wind glass 14 such as a hard resin. That's fine.

  On the other hand, the rubber holder 16 is formed in a U-shaped cross section including a top wall portion 16a extending in the longitudinal direction and a pair of side wall portions 16b extending from both side portions of the top wall portion 16a toward the wind glass 14 by a resin material. The length of the blade rubber 15 is about half. An intermediate portion of the blade rubber 15 is disposed inside the rubber holder 16 and is covered with the rubber holder 16, and only the lip portion 22 is exposed to the outside. Further, as shown in FIG. 1, a mounting portion 26 is fixed to a substantially middle portion of one side wall portion 16 b in the longitudinal direction, and the rubber holder 16 is connected to the tip of the wiper arm 13 at the mounting portion 26. . Further, fins 27 are integrally formed on the top wall portion 16a, and the aerodynamic characteristics of the wiper blade 11 are improved by the fins 27.

  As shown in FIG. 1, a holding portion 31 is provided at one end of the rubber holder 16 in the longitudinal direction (the side closer to the swing center of the wiper arm 13 when the wiper blade 11 is attached to the wiper arm 13). Yes. As shown in FIG. 4A, the holding portion 31 includes a pair of holding claws 32 (in the figure, only one side is shown, but the other side is provided with the same holding claws). 32 is formed in a rectangular cross-sectional shape protruding from the side wall portion 16b in a direction perpendicular to the longitudinal direction of the blade rubber 15 and parallel to the wiping direction, and engages with the holding groove 24 to hold the blade rubber 15 respectively. is doing. Further, the blade rubber 15 is provided with a pair of stopper portions 33a and 33b that sandwich the holding claws 32 from the longitudinal direction, and the holding claws 32 with respect to the blade rubber 15 are held in the holding grooves 24 by the stopper portions 33a and 33b. Movement in the direction along is restricted. That is, the blade rubber 15 is held by the rubber holder 16 in a state where the holding portion 31 is positioned in the longitudinal direction.

  Similarly, a holding portion 34 is provided at the other end portion of the rubber holder 16 in the longitudinal direction. As shown in FIG. 4B, the holding portion 34 has a pair of holding claws each having a rectangular cross section. 35 (only one side is shown in the figure, but the other side is provided with similar holding claws). These holding claws 35 are engaged with the holding grooves 24, thereby holding the blade rubber 15. . Further, the blade rubber 15 is not provided with a stopper portion at a portion where the holding claw 35 is engaged, and the holding claw 35 is movable along the holding groove 24. That is, the blade rubber 15 is held by the holding portion 34 so as to be movable in the axial direction with respect to the rubber holder 16.

  As described above, in the wiper blade 11, a pair of holding claws 32 and 35 are provided at both ends in the longitudinal direction of the rubber holder 16, and the blades are provided at two points of the holding parts 31 and 34 where the holding claws 32 and 35 are provided. The rubber 15 is held. Therefore, when the pressing force from the wiper arm 13 is applied to the rubber holder 16 via the mounting portion 26, the pressing force is applied to the blade rubber 15 from two points at both ends of the rubber holder 16, that is, from the holding portions 31 and 34. As a result, the blade rubber 15 is elastically brought into contact with the window glass 14.

  In FIG. 2, reference numeral 43 denotes a connecting leg provided on the cover 17 to be inserted into the end of the rubber holder 16. The cover 17 is held by the rubber holder 16 by engaging the hole 43 a of the connecting leg 43 with the boss portion 16 c of the rubber holder 16. Reference numeral 43b denotes a metal core inserted into the connecting leg 43.

  In the wiper blade 11, as shown in FIG. 6, when the wind glass 14 is wiped, the neck portion 23 is bent and the protrusion 22 b of the lip portion 22 comes into contact with the umbrella portion 21 b of the head portion 21. For this reason, when the wiper arm 13 is reversed, the projection 22b of the lip portion 22 collides with the umbrella portion 21b of the head portion 21, and the projection 22b and the umbrella portion 21b are deformed to absorb the impact. Can be suppressed.

  In the two-point support type wiper blade 11, the torsional rigidity of the blade rubber 15 decreases when the wiper blade 11 is separated from the support point by the rubber holder 16, and the impact when the protrusion 22 b of the lip portion 22 collides with the umbrella portion 21 b of the head portion 21. Absorption effect is increased. For this reason, the arrangement of the protrusions 22b is limited to the vicinity of the supporting portion of the blade rubber 15 to save material. That is, in the tournament-supported wiper blade, it is only necessary to provide the protrusions 22b as many as the number of support points by the rubber holder.

  Next, a wiper blade of a type that holds a blade rubber with a holding piece will be described. 7 is a front view showing a part of the wiper blade cut away, FIG. 8 is a top view of the rubber holder shown with the fins removed from the wiper blade, and FIG. 9 is a cross-sectional view taken along the line DD in FIG. FIG. 10 is an exploded perspective view of the rubber holder.

  The wiper blade 50 includes a blade rubber 51 that is in direct contact with the wind glass and a rubber holder 52 that supports the blade rubber 51. In a state away from the wind glass, that is, in a natural state, the wiper blade 50 has a radius of curvature of the wind glass. Curved with a small radius of curvature. A support block 53 is provided at a substantially central portion in the longitudinal direction of the rubber holder 52, and the support block 53 is shifted from each other in the movement direction when the wiper blade 50 performs the wiping operation on the window glass, that is, the wiping direction. Two rod-shaped spring members 54 as the spring members are fixed. Each of these rod-like spring members 54 is formed in a circular shape in cross section, and its axial center is formed in an arcuate shape curved with a smaller radius of curvature than the window glass. These rod-shaped spring members 54 are fixed to the support block 53 at a substantially central portion in the longitudinal direction, and protrude from both sides of the support block 53 with a predetermined length.

  On one side of the support block 53, a plurality of holding pieces 56 (for example, twelve pieces in the present embodiment), also called bridging members and elements, are provided. They are fixed side by side at intervals. That is, the holding pieces 56 are connected to each other by a bar-like spring member 54 at a predetermined interval. Similarly, a plurality of holding pieces 56 (for example, 12 pieces in the present embodiment) are provided on the other side of the support block 53, and these holding pieces 56 are spaced from the rod-shaped spring member 54 at a predetermined interval. They are fixed side by side. That is, the holding pieces 56 are connected to each other by a bar-like spring member 54 at a predetermined interval. These holding pieces 56 are formed in a C-shaped section having a base end wall portion 26a and a pair of side wall portions 56b and 56c substantially perpendicular to the base end wall portion 26a. Each penetrates one side wall part 56b or the other side wall part 56c.

  As shown by a broken line in FIG. 10, the rod-shaped spring member 54 is bent into a crank shape inside each of the side wall portions 56 b and 56 c, whereby the holding piece 56 is fixed to each rod-shaped spring member 54. That is, the rod-like spring members 54 are connected and fixed to each other by the holding pieces 56 as deformation restriction members, and their relative positions are restricted, and can be elastically deformed in a direction perpendicular to the window glass. The elastic deformation in the wiping direction is restricted.

  With such a structure, the rubber holder 52 is elastically deformable in a direction perpendicular to the window glass with the support block 53 as a fulcrum. Further, a holding claw 56d as a holding portion is formed on each side wall portion 56b, 56c of each holding piece 56, and the blade rubber 51 is held by each holding piece 56 by these holding claws 56d. ing.

  The blade rubber 51 includes a head portion 57 held by a holding piece 56, a lip portion 58 that contacts and wipes the window glass, and a neck portion 59 that connects the lip portion 58 and the head portion 57. The neck portion 59 is formed with a narrower width in the wiping direction than the head portion 57 and the lip portion 58. As a result, the lip portion 58 is tiltable in the wiping direction with respect to the head portion 57, and is maintained at an appropriate contact angle when contacting the window glass.

  The lip 58 protrudes from both shoulders 58a to form a protrusion 58b. Unlike the above-described two-point support type wiper blade 11, the projection 58 b is formed over the entire length of the blade rubber 51. The head portion 57 is provided with an umbrella portion 57 b that covers the lip portion 58.

  A holding groove 57 a is formed in the head portion 57, and the blade rubber 51 is held by the rubber holder 52 by engaging the holding claws 56 d of the holding pieces 56 with the holding groove 57 a. As the material of the blade rubber 51, natural rubber, chloroprene rubber, or the like is used, and a material in which natural rubber and chloroprene rubber are blended so as to have the advantages of each material is also often used. The blade rubber 51 is manufactured by injection molding these materials, and has the same cross-sectional shape in the longitudinal direction. You may shape | mold by extrusion molding instead of injection molding.

  Further, mounting grooves 57c are formed on both side surfaces of the blade rubber 51 above the holding groove 57a, and a vertebra 61 is mounted in each of the mounting grooves 57c. These vertebras 61 are previously curved with a predetermined curvature, and the blade rubber 51 is bent by the spring force of the vertebra 61. The operation of this vertical bar 61 will be described later.

  In this wiper blade 50, the blade rubber 51 is supported by a deformation restricting member fixed to the rod-shaped spring member 54, that is, a holding claw 56d formed on the holding piece 56. Therefore, a conventionally known tournament type wiper blade is provided. Can be used as it is, and its versatility can be improved.

  The support block 53 is provided with a clip 62 attached to a wiper arm (not shown), and the pressing force from the wiper arm is applied to the support block 53. In the natural state, the blade rubber 51 supported by the rubber holder 52 is curved by the elastic force of the rod-shaped spring member 54 together with the rubber holder 52. However, the blade rubber 51 comes into contact with the window glass and the pressing force from the wiper arm is increased. When added to the support block 53, the rubber holder 52 is elastically deformed in accordance with the curvature of the window glass, and the blade rubber 51 contacts the window glass. That is, the pressing force from the wiper arm is dispersedly applied to the blade rubber 51 by the rod-shaped spring member 54, and the blade rubber 51 contacts the window glass with a predetermined distributed pressure characteristic.

  The wiper blade 50 has fins 63 as fin members made of, for example, hard rubber, and the fins 63 are attached to the holding pieces 56 so as to cover the entire rubber holder 52. It has become. Therefore, the cross-sectional shape of the wiper blade 50 has a shape excellent in aerodynamic characteristics, and the wiper blade 50 can be prevented from lifting when the vehicle is traveling at high speed, thereby improving the wiping performance. Further, since the wiper blade 50 itself has a fin shape, the height of the wiper blade 50 can be suppressed and the visibility of the driver or the like can be improved.

  In the wiper blade 50, a rod-shaped spring member 54 having a circular cross section is used as a spring member that distributes and applies the pressing force from the wiper arm to the blade rubber 51, so that the rod-shaped spring member 54 has a cross-sectional area of the wiper blade 50. The occupation ratio is small, and the degree of freedom of design is not lowered when setting the cross-sectional shape in consideration of the aerodynamic characteristics of the wiper blade 50. Therefore, the holding piece 56 and the fin 63 can be set to a shape optimal for the aerodynamic characteristics.

  In this wiper blade 50, since the elastic member that distributes and applies the pressing force of the wiper arm 13 to the blade rubber 51 is the rod-shaped spring member 54, the area of the rod-shaped spring member 54 occupying the cross-sectional shape of the wiper blade 50 is reduced. The degree of freedom in designing the cross-sectional shape of the DR-side wiper blade 50 can be improved.

  Further, as shown in the figure, the respective bar-shaped spring members 54 are arranged side by side on the wiping direction side with respect to the blade rubber 51. That is, the rod-shaped spring members 54 are arranged side by side on one side and the other side of the blade rubber 51, respectively. Accordingly, the height dimension of the wiper blade 50 in the direction perpendicular to the wind glass can be reduced.

  Since the wiper blade 50 can be formed with a low height dimension in a direction perpendicular to the window glass, the visibility of a driver or the like in a vehicle using the wiper blade 50 can be improved.

  The wiper blade 50 is provided with a stopper 64 as excessive deformation restricting means for the rubber holder 52. The stopper 64 includes a plurality of deformation restriction blocks 65 disposed between adjacent holding pieces 56 and a connecting band portion 66 that connects the deformation restriction blocks 65 to each other.

  As shown in FIG. 10, U-shaped engaging portions 67 are formed at both ends of each holding piece 56. The stopper 64 is assembled to the rubber holder 52 in a state where the respective deformation regulating blocks 65 are engaged with the engaging portions 67 of the adjacent holding pieces 56. Two groove portions 68 are formed in the base end wall portion 56 a of each holding piece 56 in the direction connecting the respective engaging portions 67, and the connecting band portion 66 is engaged with the groove portion 68. Further, each holding piece 56 is formed with a through hole 69 penetrating in a direction perpendicular to the groove 68 at a substantially central portion of the groove 68. The through hole 68 is closed by a connecting band portion 66.

  In the wiper blade 50 as well as the two-point support wiper blade 11 described above, when the wind glass is wiped, the neck portion 59 bends and the protrusion 58b of the lip portion 58 contacts the umbrella portion 57b of the head portion 57. It will be. For this reason, when the wiper arm is reversed, the projection 58b of the lip 58 collides with the umbrella portion 57b of the head portion 57, and the projection 58b and the umbrella portion 57b are deformed to absorb the impact. Can be suppressed.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the two-point support type wiper blade 11 and the wiper blade 50 using the holding piece 56 have been described, but the present invention can be applied to a tournament support type in addition to these wiper blades. Applicable.

  In the above embodiment, the impact is absorbed by the elastic deformation of both the protrusions 22b and 58b of the lip portions 22 and 58 and the umbrella portions 21b and 57b of the head portions 21 and 57. Even if the umbrella portions 21b and 57b are omitted, the noise suppressing effect can be expected to some extent.

1 is a perspective view showing a two-point support wiper blade according to an embodiment of the present invention. It is sectional drawing which follows the AA line in FIG. It is sectional drawing which follows the BB line in FIG. It is explanatory drawing which shows the detail of the holding | maintenance part of FIG. It is sectional drawing which follows the CC line in FIG. It is a figure explaining the wiping operation | movement of a window glass. It is a front view which notches and shows a part of wiper blade which is other embodiment of this invention. It is a top view of the rubber holder which removes and shows a fin from the wiper blade. It is sectional drawing which follows the DD line | wire in FIG. It is a disassembled perspective view of a rubber holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Wiper blade 12 Vehicle 13 Wiper arm 14 Wind glass 15 Blade rubber 16 Rubber holder 16a Top wall part 16b Side wall part 16c Boss part 17 Cover 21 Head part 21a Mounting groove 21b Umbrella part 22 Lip part 22a Shoulder 22b Protrusion 23 Neck part 24 Holding groove 25 leaf spring member 26 mounting portion 26a base end wall portion 27 fin 31 holding portion 32 holding claw 33a stopper portion 34 holding portion 35 holding claw 43 connecting leg 43a hole 43b cored bar 50 wiper blade 51 blade rubber 52 rubber holder 53 support block 54 Rod spring member 56 Holding piece 56a Base end wall portion 56b Side wall portion 56c Side wall portion 56d Holding claw 57 Head portion 57a Holding groove 57b Umbrella portion 57c Mounting groove 58 Lip portion 58a Shoulder 58b Projection 59 Neck portion 61 Berty Bra 62 Clip 63 Fin 64 Stopper 65 Deformation restriction block 66 Connection band portion 67 Engagement portion 67 Both engagement portions 68 Groove portion 69 Through hole

Claims (2)

Attached to the tip of the wiper arm that swings, and includes a rubber holder having a holding claw and a rod-shaped blade rubber held by the rubber holder, the blade rubber is held by pre-SL rubber holder there wherein a head portion having a holding groove for holding pawl engages a lip for wiping the window glass, in the wiper blade is configured with a neck portion connecting the lip and the front SL head portion when And
The blade rubber, the a supporting point where the holding claws is supported by the rubber holder is engaged with the holding groove, prior SL projection for shock absorption provided by protruding the wiping direction of the both shoulders of the lip And the protrusion is formed near the support point in the longitudinal direction of the blade rubber,
The blade rubber has a pair of stopper portions that sandwich the holding claw engaged with the holding groove from both sides in the longitudinal direction . In the wiper blade according to claim 1, wherein the wiper blade, characterized in that the pre-Symbol covering lip portion, provided abutting umbrella before Symbol projections before Symbol head.

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