JP2012035731A - Wiper blade and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper blade that can reduce manufacturing cost.SOLUTION: The wiper blade includes: a refill which wipes away a surface to be slid; an elastic member made of resin holding the refill; and a wiper arm mount which is fixed to the elastic member and configured to be mountable to the wiper arm tip which performs reciprocate rotation. The elastic member is configured to generate the force to push the refill against the surface to be slid by receiving traveling wind pressure, while configuring the refill in elastic deformable so that the refill may be stuck to the surface to be slid.

Description

  The present invention relates to a wiper blade used in a wiper device for wiping a sliding surface and a method for manufacturing the wiper blade.

  2. Description of the Related Art Conventionally, a windshield device, a windshield, and the like of a vehicle have been provided with a wiper device for wiping rainwater and foreign matter adhering to the glass surface to ensure visibility of a vehicle operator. The wiper device includes a wiper arm that is swingably supported by a vehicle, for example, and a wiper blade is attached to the tip of the wiper arm. Hereinafter, an example of a conventional wiper blade will be described with reference to FIG.

  FIG. 1 is an exploded perspective view illustrating a conventional wiper blade. Referring to FIG. 1, the wiper blade 100 includes a refill 110, a vertebra 120, a holder 130, a clip base 140, a clip base cover 150, and two spoilers 160. The refill 110 is a member (rubber or the like) for wiping a glass surface such as a windshield and a rear glass. Vertibra 120 is an elastic metal plate (spring), and is configured to be elastically deformable so that refill 110 is brought into close contact with the sliding surface. A holder 130 for attaching the refill 110 is attached to the vertical bar 120.

  The clip base 140 is attached to the upper surface side of the vertebra 120. The clip base 140 has a shaft 140x and is configured to be attachable to a wiper arm (not shown). The clip base cover 150 is a member that covers the clip base 140 while spanning two spoilers 160. The spoiler 160 is a member (rubber, elastomer resin, or the like) that covers the vertebra 120 so as to sandwich the clip base 140, and is configured to generate a force that presses the refill 110 against the sliding surface by receiving traveling wind pressure. ing.

  As described above, the refill 110, the vertebra 120, the holder 130, the clip base 140, the clip base cover 150, and the two spoilers 160 are assembled to complete the wiper blade 100 (see, for example, Patent Document 1).

JP 2007-245931 A

  However, the conventional wiper blade has a problem that it is difficult to reduce the manufacturing cost because the number of component parts is large (see FIG. 1) and the assembly work efficiency is poor.

  This invention is made | formed in view of the above, and makes it a subject to provide the wiper blade which can reduce manufacturing cost.

  The wiper blade includes a refill that wipes the sliding surface, a resin elastic member that holds the refill, and a wiper arm that is fixed to the elastic member and can be attached to the tip of a wiper arm that reciprocally rotates. And the elastic member is configured to be elastically deformable so that the refill is brought into close contact with the sliding surface, and receives the traveling wind pressure to cause the refill to move to the sliding surface. It is a requirement that it is configured to generate a force that presses it against.

  In addition, the wiper blade manufacturing method can be attached to a refill for wiping the sliding surface, a resin elastic member for holding the refill, and a wiper arm tip fixed to the elastic member and reciprocally rotated. A wiper arm mounting portion configured, and the elastic member is configured to be elastically deformable so that the refill is brought into close contact with the sliding surface, and the refill is received by receiving a traveling wind pressure. A method for manufacturing a wiper blade configured to generate a force to be pressed against the sliding surface, the method including a molding step of molding the elastic member with a resin.

  According to the disclosed technology, it is possible to provide a wiper blade capable of reducing the manufacturing cost.

It is a disassembled perspective view which illustrates the conventional wiper blade. It is a perspective view which illustrates the wiper blade concerning a 1st embodiment. FIG. 3 is a perspective sectional view taken along line AA in FIG. 2. 1 is an exploded perspective view illustrating a wiper blade according to a first embodiment. FIG. 5 is a diagram (part 1) illustrating a manufacturing process of the wiper blade according to the first embodiment; FIG. 6 is a second diagram illustrating a manufacturing process of the wiper blade according to the first embodiment; FIG. 6 is a diagram (No. 3) illustrating the manufacturing process of the wiper blade according to the first embodiment; FIG. 7 is a diagram (No. 4) for exemplifying the manufacturing process for the wiper blade according to the first embodiment; It is a perspective view which illustrates the wiper blade which concerns on the modification of 1st Embodiment. FIG. 10 is a perspective sectional view taken along line BB in FIG. 9. It is a disassembled perspective view which illustrates the wiper blade which concerns on the modification of 1st Embodiment. It is a figure which illustrates the manufacturing process of the wiper blade which concerns on the modification of 1st Embodiment. It is a perspective view which illustrates the wiper blade concerning a 2nd embodiment. FIG. 14 is a perspective sectional view taken along the line CC of FIG. 13. It is a disassembled perspective view which illustrates the wiper blade which concerns on 2nd Embodiment. It is a figure which illustrates the manufacturing process of the wiper blade which concerns on 2nd Embodiment. It is a perspective view which illustrates the wiper blade which concerns on 3rd Embodiment. FIG. 18 is a perspective sectional view taken along the line DD in FIG. 17. FIG. 6 is an exploded perspective view illustrating a wiper blade according to a third embodiment. It is a figure which illustrates the manufacturing process of the wiper blade which concerns on 3rd Embodiment. FIG. 3 is a diagram (part 1) illustrating an analysis result of a wiper blade according to the present invention; FIG. 6 is a second diagram illustrating an analysis result of the wiper blade according to the present invention. FIG. 6 is a third diagram illustrating an analysis result of the wiper blade according to the invention. It is a figure which illustrates the load comparison result of the elastic member which concerns on this invention, and the conventional vertebra.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and the overlapping description may be abbreviate | omitted.

<First Embodiment>
FIG. 2 is a perspective view illustrating the wiper blade according to the first embodiment. FIG. 3 is a perspective sectional view taken along line AA in FIG. FIG. 4 is an exploded perspective view illustrating the wiper blade according to the first embodiment. 2 to 4, the wiper blade 10 includes a refill 11, an elastic member 12, and a wiper arm attachment portion 13. The wiper blade 10 is configured to be attachable to a tip of a wiper arm (not shown) that reciprocally rotates a wiper device provided in a vehicle including an automobile, a construction machine, a train, a ship, and an aircraft.

  The refill 11 is a member for wiping the sliding surface (glass surface or the like) of the vehicle. As the refill 11, for example, synthetic rubber or silicon rubber can be used. The refill 11 includes a sliding portion 11a, a connecting portion 11b, and a fixing portion 11c. The sliding part 11a has a substantially inverted triangular cross section, and the vicinity of the tip part (the side opposite to the connecting part 11b) is in contact with the sliding surface and is slidable on the sliding surface. The connection part 11b is a part which connects the sliding part 11a and the fixing | fixed part 11c, and is comprised so that the sliding part 11a can be inclined with respect to the fixing | fixed part 11c. The fixing portion 11 c is a portion that fixes the refill 11 to the elastic member 12.

  The elastic member 12 includes a first elastic member 12a and a second elastic member 12b. The elastic member 12 is configured to be elastically deformable so that the refill 11 is brought into close contact with the sliding surface, and receives the traveling wind pressure so as to receive the refill 11. It is comprised so that the force which presses to a to-be-slided surface may be generate | occur | produced. In other words, the elastic member 12 is a member in which the vertebra 120 of the conventional wiper blade 100 and the two spoilers 160 are integrated, and the two parts (the first elastic member 12a and the second elastic member 12b) are used to form the vertebra 120. Both the function and the function of the two spoilers 160 are combined. An attachment portion 12c is provided in the vicinity of the center of the elastic member 12, and a wiper arm attachment portion 13 is attached to the attachment portion 12c.

  The elastic member 12 sandwiches the fixing portion 11c of the refill 11 by a groove portion 12x formed along the longitudinal direction of the first elastic member 12a and a groove portion 12y formed along the longitudinal direction of the second elastic member 12b. The refill 11 is held. The first elastic member 12a and the second elastic member 12b are fixed to each other by, for example, heat welding, ultrasonic welding, screwing, or the like. Further, the first elastic member 12a and the second elastic member 12b may be fixed by press-fitting.

  The elastic member 12 is formed to have a predetermined curvature (predetermined R shape) so that the vicinity of the tip of the sliding portion 11a of the refill 11 is in close contact with the sliding surface, and the refill 11 is formed on the sliding surface. It is configured to be elastically deformable in the direction of close contact. The elastic member 12 can have a substantially flat shape when pressed toward the sliding surface. As the elastic member 12 (the first elastic member 12a and the second elastic member 12b), for example, a resin material such as polyacetal resin (POM), acrylonitrile butadiene styrene copolymer (ABS), or polycarbonate resin (PC) can be used. . By using such a resin material, the elastic member 12 (the first elastic member 12a and the second elastic member 12b) can be formed by injection molding.

  As described above, the conventional wiper blade 100 has the vertebra 120 (metal spring) and the spoiler 160 that is a separate part from the vertebra 120, but the wiper blade 10 integrates the conventional vertebra 120 and the spoiler 160. The resinous elastic member 12 is provided.

  Note that the surface of the elastic member 12 may be colored. Since the conventional spoiler 160 is made of rubber, elastomer resin, or the like, it is difficult to get a general-purpose paint on it, and it is difficult to color it by painting. . On the other hand, since the elastic member 12 is made of resin, it can be easily colored by painting using a general-purpose paint or the like, and the problem that the paint is peeled off due to cracks hardly occurs. For example, by coloring the surface of the elastic member 12 in the same color as the vehicle to which the wiper blade 10 is attached, a design that matches the vehicle can be realized, and the merchantability of the wiper blade 10 can be improved.

  The wiper arm attachment portion 13 includes an attachment portion main body 13a, a shaft 13b, and an attachment 13c. The wiper arm attachment portion 13 is a member corresponding to the clip base 140 of the conventional wiper blade 100. The attachment portion main body 13 a is fixed to the attachment portion 12 c of the elastic member 12. The attachment portion main body 13a and the attachment portion 12c are fixed to each other by, for example, heat welding, ultrasonic welding, screwing, or the like. Moreover, you may fix the attachment part main body 13a and the attachment part 12c by press fit. The shaft 13b is fixed to the attachment portion main body 13a by caulking or the like, for example. The attachment 13c is attached to the shaft 13b by fitting or the like, for example. The attachment 13c is configured to be attachable to a tip of a wiper arm (not shown) that reciprocally rotates. The attachment portion main body 13a and the shaft 13b are made of, for example, metal, and the attachment 13c is made of, for example, resin.

  Next, the manufacturing process of the wiper blade 10 will be described with reference to FIGS. 5-8 is a figure which illustrates the manufacturing process of the wiper blade which concerns on 1st Embodiment. First, in the step shown in FIG. 5, a first elastic member 12a and a second elastic member 12b formed by molding a resin, and a refill 11 made of synthetic rubber or silicon rubber are prepared. The first elastic member 12a and the second elastic member 12a and the second elastic member 12a are sandwiched between the groove portion 12x (see FIG. 3) of the first elastic member 12a and the groove portion 12y (see FIG. 3) of the second elastic member 12b. The elastic members 12b are fixed to each other. As described above, the fixing can be performed by heat welding, ultrasonic welding, screwing, press fitting, or the like.

  Next, in the process shown in FIG. 6, the attachment portion main body 13 a and the shaft 13 b of the wiper arm attachment portion 13 are prepared. And the axis | shaft 13b is fixed to the attaching part main body 13a. As described above, the fixing can be performed by caulking or the like. Next, in the step shown in FIG. 7, the attachment portion main body 13 a (see FIG. 6) to which the shaft 13 b is fixed is attached to the attachment portion 12 c of the elastic member 12 (see FIG. 5) that holds the refill 11. As described above, the attachment can be performed by thermal welding, ultrasonic welding, screwing, press fitting, or the like.

  Next, in the step shown in FIG. 8, the attachment 13c is attached to the shaft 13b of the structure shown in FIG. As described above, the attachment can be performed by fitting or the like. By this step, the wiper blade 10 shown in FIG. 2 and the like is completed.

  Note that a step of coloring the surface of the elastic member 12 may be provided. As described above, since the elastic member 12 is made of resin, it can be easily colored. The elastic member 12 can be colored by applying a paint. If necessary, the surface of the elastic member 12 may be colored after being subjected to a predetermined treatment.

  As described above, according to the first embodiment, in the wiper blade 10, the portion that is configured of the three components (vertebra 120 and the two spoilers 160) in the conventional wiper blade 100 is replaced with the two components. (The 1st elastic member 12a and the 2nd elastic member 12b) are comprised. As a result, it is possible to reduce the unit unit cost and assembly man-hour by reducing the number of parts, and the manufacturing cost of the wiper blade 10 can be reduced.

<Modification of First Embodiment>
FIG. 9 is a perspective view illustrating a wiper blade according to a modification of the first embodiment. FIG. 10 is a perspective sectional view taken along line BB in FIG. FIG. 11 is an exploded perspective view illustrating a wiper blade according to a modification of the first embodiment. Referring to FIGS. 9 to 11, the wiper blade 20 is different from the wiper blade 10 in that the elastic member 12 is replaced with the elastic member 22. Hereinafter, the description of the same components as the wiper blade 10 will be omitted as much as possible with respect to the wiper blade 20, and the description will focus on portions that differ from the wiper blade 10.

  In the wiper blade 20, like the elastic member 12, the elastic member 22 is configured to be elastically deformable so that the refill 11 is brought into close contact with the sliding surface, and is slid by receiving the traveling wind pressure. It is comprised so that the force pressed against a moving surface may be generate | occur | produced. Unlike the elastic member 12, the elastic member 22 does not have a portion corresponding to the first elastic member 12a and the second elastic member 12b, and a portion corresponding to the first elastic member 12a and the second elastic member 12b is integrally formed. The elastic member main body 22a is provided. An attachment portion 22c is provided in the vicinity of the center of the elastic member 22, and the wiper arm attachment portion 13 is attached to the attachment portion 22c.

  That is, the elastic member 22 is a member in which the vertebra 120 of the conventional wiper blade 100 and the two spoilers 160 are integrated, and the function of the vertebra 120 and the function of the two spoilers 160 are combined with one component. ing. The elastic member 22 holds the refill 11 by inserting the fixing portion 11c of the refill 11 into a groove 22x formed along the longitudinal direction of the elastic member main body 22a.

  Similar to the elastic member 12, the elastic member 22 is formed to have a predetermined curvature (predetermined R shape) in order to stably bring the vicinity of the tip of the sliding portion 11a of the refill 11 into contact with the sliding surface. 11 is configured to be elastically deformable in a direction in which 11 is brought into close contact with the sliding surface. The elastic member 22 can have a substantially flat shape when pressed toward the sliding surface. As the elastic member 22, like the elastic member 12, for example, a resin material such as polyacetal resin (POM), acrylonitrile butadiene styrene copolymer (ABS), polycarbonate resin (PC), or the like can be used. By using such a resin material, the elastic member 22 can be molded by injection molding.

  As described above, the conventional wiper blade 100 has the vertebra 120 (metal spring) and the spoiler 160 which is a separate part from the vertebra 120, but the wiper blade 20 integrates the conventional vertebra 120 and the spoiler 160. The resinous elastic member 22 is provided. Note that the surface of the elastic member 22 may be colored.

  Next, the manufacturing process of the wiper blade 20 will be described with reference to FIG. FIG. 12 is a diagram illustrating a manufacturing process of the wiper blade according to the modification of the first embodiment. First, in the process shown in FIG. 12, an elastic member 22 formed by molding a resin and a refill 11 made of synthetic rubber, silicon rubber, or the like are prepared. And the fixing | fixed part 11c of the refill 11 is inserted into the groove part 22x (refer FIG. 10) from the insertion port 22y of the elastic member 22. FIG. Thereby, the fixing | fixed part 11c is inserted in the groove part 22x, and the sliding part 11a and the connection part 11b protrude from the elastic member 22 through the notch part 22z. Next, the wiper blade 20 shown in FIG. 9 and the like is completed by performing the same steps as those in FIGS. 6 to 8 of the first embodiment.

  As described above, according to the modification of the first embodiment, in the wiper blade 20, the portion of the conventional wiper blade 100 that is composed of three parts (vertebra 120 and two spoilers 160) is It consists of one component (elastic member 22). Thereby, the number of parts can be further reduced as compared with the first embodiment. As a result, it is possible to further reduce the unit cost and the number of assembly steps, and the manufacturing cost of the wiper blade 20 can be further reduced as compared with the wiper blade 10.

<Second Embodiment>
FIG. 13 is a perspective view illustrating a wiper blade according to the second embodiment. FIG. 14 is a perspective sectional view taken along the line CC of FIG. FIG. 15 is an exploded perspective view illustrating a wiper blade according to the second embodiment. Referring to FIGS. 13 to 15, the wiper blade 30 is different from the wiper blade 10 in that the elastic member 12 is replaced with an elastic member 32. Hereinafter, the description of the same components as the wiper blade 10 will be omitted as much as possible with respect to the wiper blade 30, and the description will focus on portions that differ from the wiper blade 10.

  In the wiper blade 30, like the elastic member 12, the elastic member 32 is configured to be elastically deformable so that the refill 11 is brought into close contact with the surface to be slid, and the refill 11 is slid by receiving the traveling wind pressure. It is comprised so that the force pressed against a moving surface may be generate | occur | produced. Unlike the elastic member 12, the elastic member 32 does not have a portion corresponding to the first elastic member 12a and the second elastic member 12b, and a portion corresponding to the first elastic member 12a and the second elastic member 12b is integrally formed. The elastic member main body 32a is provided. An attachment portion 32c is provided in the vicinity of the center of the elastic member 32, and the wiper arm attachment portion 13 is attached to the attachment portion 32c.

  In other words, the elastic member 32 is a member in which the vertebra 120 of the conventional wiper blade 100 and the two spoilers 160 are integrated, and both the functions of the vertebra 120 and the functions of the two spoilers 160 are combined with one component. ing. The elastic member 32 holds the refill 11 by inserting the fixing portion 11c of the refill 11 into the groove 32x formed along the longitudinal direction of the elastic member main body 32a.

  However, the elastic member 32 is integrated not only with the conventional vertebra 120 and the two spoilers 160 of the wiper blade 100 but also with the attachment portion main body 13a of the wiper arm attachment portion 13. The elastic member 32 is formed by insert-molding a resin material on the attachment portion main body 13 a (made of metal) of the wiper arm attachment portion 13.

  Similar to the elastic member 12, the elastic member 32 is formed with a predetermined curvature (predetermined R shape) in order to stably bring the vicinity of the tip of the sliding portion 11a of the refill 11 into contact with the sliding surface. 11 is configured to be elastically deformable in a direction in which 11 is brought into close contact with the sliding surface. The elastic member 32 can have a substantially flat shape when pressed toward the sliding surface. As the elastic member 32, similarly to the elastic member 12, for example, a resin material such as polyacetal resin (POM), acrylonitrile butadiene styrene copolymer (ABS), or polycarbonate resin (PC) can be used. By using such a resin material, insert molding of the elastic member 32 becomes possible.

  As described above, the conventional wiper blade 100 has the vertebra 120 (metal spring) and the clip base 140 and the spoiler 160 which are separate parts from the vertebra 120, but the wiper blade 30 has the conventional vertebra 120 and clip. A resinous elastic member 32 in which the base 140 and the spoiler 160 are integrated (insert molding) is provided. The surface of the elastic member 32 may be colored.

  Next, the manufacturing process of the wiper blade 30 will be described with reference to FIG. FIG. 16 is a diagram illustrating a manufacturing process of the wiper blade according to the second embodiment. First, in the step shown in FIG. 16, the attachment portion main body 13 a of the wiper arm attachment portion 13 is prepared. Then, the mounting portion main body 13a is loaded into a predetermined position in the mold corresponding to the shape of the elastic member 32. Further, a resin material to be the elastic member 32 is injected into the mold, and a part of the mounting portion main body 13a, which is an insert product, is wrapped with the molten resin material and solidified (insert molding). Thereby, the elastic member 32 in which the attachment portion main body 13a is integrally provided is completed. As the resin material to be injected, for example, polyacetal resin (POM), acrylonitrile butadiene styrene copolymer (ABS), polycarbonate resin (PC), or the like can be used.

  Next, the shaft 13 b is fixed to the attachment portion main body 13 a of the wiper arm attachment portion 13 in the same manner as in FIG. 6 of the first embodiment. As described above, the fixing can be performed by caulking or the like. Next, similarly to FIG. 12 of the modification of the first embodiment, the fixing portion 11c of the refill 11 is inserted into the groove portion 32x (see FIG. 14) from the insertion port of the elastic member 32. Next, the attachment 13c is attached to the shaft 13b in the same manner as in FIG. 8 of the first embodiment. As described above, the attachment can be performed by fitting or the like. By this step, the wiper blade 30 shown in FIG. 13 and the like is completed.

  As described above, according to the second embodiment, in the wiper blade 30, the conventional wiper blade 100 includes four parts (vertebra 120, clip base 140, and two spoilers 160). Is composed of one component (the elastic member 32 integrally provided with the attachment portion main body 13a of the wiper arm attachment portion 13). Thereby, the number of parts can be further reduced as compared with the first embodiment. As a result, it is possible to further reduce the unit cost and the number of assembly steps, and the manufacturing cost of the wiper blade 30 can be further reduced as compared with the wiper blade 10. Further, the number of parts can be further reduced as compared with the modified example of the first embodiment. As a result, it is possible to further reduce the unit cost and the number of assembly steps, and the manufacturing cost of the wiper blade 30 can be further reduced as compared with the wiper blade 20.

<Third Embodiment>
FIG. 17 is a perspective view illustrating a wiper blade according to the third embodiment. 18 is a perspective sectional view taken along the line DD of FIG. FIG. 19 is an exploded perspective view illustrating a wiper blade according to the third embodiment. 17 to 19, the wiper blade 40 is different from the wiper blade 10 in that the elastic member 12 is replaced with the elastic member 42. Hereinafter, the description of the same components as the wiper blade 10 will be omitted as much as possible with respect to the wiper blade 40, and the description will focus on the portions that are different from the wiper blade 10.

  In the wiper blade 40, like the elastic member 12, the elastic member 42 is configured to be elastically deformable so that the refill 11 is brought into close contact with the surface to be slid, and the refill 11 is slid by receiving the traveling wind pressure. It is comprised so that the force pressed against a moving surface may be generate | occur | produced. Unlike the elastic member 12, the elastic member 42 does not have a portion corresponding to the first elastic member 12a and the second elastic member 12b, and a portion corresponding to the first elastic member 12a and the second elastic member 12b is integrally formed. The elastic member main body 42a is provided. An attachment portion 42c is provided in the vicinity of the center of the elastic member 42, and the wiper arm attachment portion 13 is attached to the attachment portion 42c.

  That is, the elastic member 42 is a member in which the vertebra 120 of the conventional wiper blade 100 and the two spoilers 160 are integrated, and both the functions of the vertebra 120 and the functions of the two spoilers 160 are combined with one component. ing. The elastic member 42 holds the fixing portion 11c of the refill 11 with a groove portion 42x formed along the longitudinal direction of the elastic member main body 42a.

  However, the elastic member 42 is integrated not only with the conventional vertebra 120 and the two spoilers 160 of the wiper blade 100 but also with the refill 11 and the attachment portion main body 13 a of the wiper arm attachment portion 13. The elastic member 42 is formed by insert molding a resin material on the attachment portion main body 13 a (made of metal) of the refill 11 and the wiper arm attachment portion 13. Therefore, in FIG. 18, the groove part 42x and the fixing part 11c of the refill 11 are in contact with each other, and no gap as shown in FIGS. 3, 10, and 14 is formed.

  Similar to the elastic member 12, the elastic member 42 is formed to have a predetermined curvature (predetermined R shape) in order to stably bring the vicinity of the tip of the sliding portion 11a of the refill 11 into contact with the sliding surface. 11 is configured to be elastically deformable in a direction in which 11 is brought into close contact with the sliding surface. The elastic member 42 can have a substantially flat shape when pressed toward the sliding surface. As the elastic member 42, similarly to the elastic member 12, for example, a resin material such as polyacetal resin (POM), acrylonitrile butadiene styrene copolymer (ABS), and polycarbonate resin (PC) can be used. By using such a resin material, insert molding of the elastic member 42 becomes possible.

  As described above, the conventional wiper blade 100 has the vertebra 120 (metal spring) and the refill 110, the clip base 140, and the spoiler 160, which are separate parts from the vertebra 120, but the wiper blade 40 has the conventional wiper blade 40. It has a resinous elastic member 42 in which the refill 110, the vertebra 120, the clip base 140, and the spoiler 160 are integrated (insert molding). The surface of the elastic member 42 may be colored.

  Next, the manufacturing process of the wiper blade 40 will be described with reference to FIG. FIG. 20 is a diagram illustrating a manufacturing process of the wiper blade according to the third embodiment. First, in the step shown in FIG. 20, the refill 11 and the attachment portion main body 13 a of the wiper arm attachment portion 13 are prepared. Then, the refill 11 and the attachment portion main body 13a are loaded at predetermined positions in the mold corresponding to the shape of the elastic member 42. Further, a resin material that becomes the elastic member 42 is injected into the mold, and the refill 11 that is an insert product and a part of the attachment portion main body 13a are wrapped with a molten resin material and solidified (insert molding). Thereby, the elastic member 42 in which the refill 11 and the attachment main body 13a are integrally provided is completed. As the resin material to be injected, for example, polyacetal resin (POM), acrylonitrile butadiene styrene copolymer (ABS), polycarbonate resin (PC), or the like can be used.

  Next, the shaft 13 b is fixed to the attachment portion main body 13 a of the wiper arm attachment portion 13 in the same manner as in FIG. 6 of the first embodiment. As described above, the fixing can be performed by caulking or the like. Next, the attachment 13c is attached to the shaft 13b in the same manner as in FIG. 8 of the first embodiment. As described above, the attachment can be performed by fitting or the like. By this step, the wiper blade 40 shown in FIG. 17 and the like is completed.

  As described above, according to the third embodiment, the wiper blade 40 is composed of five parts (the refill 110, the vertebra 120, the clip base 140, and the two spoilers 160) in the conventional wiper blade 100. The portion that has been formed is constituted by one component (the elastic member 42 in which the refill 11 and the attachment portion main body 13a of the wiper arm attachment portion 13 are integrally provided). Thereby, the number of parts can be further reduced as compared with the first embodiment. As a result, it is possible to further reduce the unit cost and the number of assembly steps, and the manufacturing cost of the wiper blade 40 can be further reduced as compared with the wiper blade 10. Further, the number of parts can be further reduced as compared with the modified example of the first embodiment. As a result, it is possible to further reduce the unit cost and the number of assembly steps, and the manufacturing cost of the wiper blade 40 can be further reduced as compared with the wiper blade 20. In addition, the number of parts can be further reduced as compared with the second embodiment. As a result, it is possible to further reduce the unit cost and the number of assembly steps, and the manufacturing cost of the wiper blade 40 can be further reduced as compared with the wiper blade 30.

<Analysis result>
21A to 21C are diagrams illustrating analysis results of the wiper blade according to the present invention. 21A is a side view showing a state where no load is applied to the elastic member 12, FIG. 21B is a side view showing a state where a load is applied to the elastic member 12, and FIG. 21C is a view showing a flat state where a load is applied to the elastic member 12. It is a top view of the state which became. 21A to 21C, the elastic member 12 (see FIG. 2) using polyacetal resin (POM) was used as an analysis model, and the R shape and stress concentration were analyzed. Since the elastic member 12 has a symmetrical shape, a half shape is used as an analysis model to facilitate analysis.

  In this analysis, the R shape shown in FIG. 21A was calculated so that the entire shape shown in FIGS. 21B and 21C would be flat when the elastic member 12 was pressed against the sliding surface. Further, as shown in FIGS. 21B and 21C, the stress when the elastic member 12 was pressed against the sliding surface was calculated. It was confirmed that even when the R shape shown in FIG. 21A was deformed into a flat shape as shown in FIGS. 21B and 21C, no breakage due to stress concentration occurred.

  FIG. 22 is a diagram illustrating a result of load comparison between the elastic member according to the present invention and a conventional vertebra. In FIG. 22, the present invention (circle) shows an elastic member 12 (resin spring), and the conventional (square) shows a conventional vertebra. In addition, as the elastic member 12 (resin spring) according to the present invention, the shape obtained in FIGS. 21A to 21C is assumed, and as a conventional vertebra, a known metal vertebra shape is assumed. As shown in FIG. 22, it was confirmed that the elastic member 12 (resin spring) can realize the same spring characteristics as the conventional vertebra 120 (sheet metal spring).

  In order for the elastic member 12 to have a spring characteristic equivalent to that of the conventional vertebra 120, the cross-sectional shape (see FIG. 3 and the like) and the R shape (see FIG. 21A and the like) of the elastic member 12 are particularly important. Therefore, it is necessary to appropriately design the cross-sectional shape and the R shape of the elastic member 12 so that the characteristics as shown in FIG. 22 are obtained. Note that the same analysis results as those of the elastic member 12 are confirmed for the elastic members 22, 32, and 42.

  The preferred embodiment and its modification have been described in detail above, but the present invention is not limited to the above-described embodiment and its modification, and the above-described implementation is performed without departing from the scope described in the claims. Various modifications and substitutions can be added to the embodiment and its modifications.

  For example, the wiper blade according to the present invention may be applied to other than the vehicle.

10, 20, 30, 40 Wiper blade 11 Refill 11a Sliding part 11b Connecting part 11c Fixing part 12, 22, 32, 42 Elastic member 12a First elastic member 12b Second elastic member 12c, 22c, 32c, 42c Mounting part 12x , 12y, 22x, 32x, 42x Groove part 13 Wiper arm attachment part 13a Attachment part main body 13b Shaft 13c Attachment 22a, 32a, 42a Elastic member main body 22y Insert port 22z Notch part

Claims (9)

A refill to wipe the sliding surface;
An elastic member made of resin that holds the refill;
A wiper arm mounting portion fixed to the elastic member and configured to be attachable to the tip of a wiper arm that reciprocally rotates,
The elastic member is configured to be elastically deformable so that the refill is brought into close contact with the sliding surface, and generates a force for pressing the refill against the sliding surface by receiving a traveling wind pressure. A wiper blade characterized by comprising. The wiper arm attachment part has a metal attachment part body,
The wiper blade according to claim 1, wherein the attachment main body is integrally formed with the elastic member. The wiper arm attachment part has a metal attachment part body,
The wiper blade according to claim 1, wherein the attachment main body and the refill are integrally formed with the elastic member. The elastic member includes a first elastic member in which a groove is formed along the longitudinal direction, and a second elastic member in which the groove is formed along the longitudinal direction.
The wiper blade according to claim 1, wherein the refill is held by sandwiching the refill between the groove portion of the first elastic member and the groove portion of the second elastic member.   The wiper blade according to any one of claims 1 to 4, wherein a surface of the elastic member is colored. A refill to wipe the sliding surface;
An elastic member made of resin that holds the refill;
A wiper arm mounting portion fixed to the elastic member and configured to be attachable to the tip of a wiper arm that reciprocally rotates,
The elastic member is configured to be elastically deformable so that the refill is brought into close contact with the sliding surface, and generates a force for pressing the refill against the sliding surface by receiving a traveling wind pressure. A wiper blade manufacturing method comprising:
A method for manufacturing a wiper blade, comprising a molding step of molding the elastic member with a resin. The wiper arm attachment part has a metal attachment part body,
In the molding step, the mounting portion main body is loaded at a predetermined position in a mold corresponding to the shape of the elastic member, and a resin material that becomes the elastic member is injected into the mold and solidified. The manufacturing method of the wiper blade of Claim 6. The wiper arm attachment part has a metal attachment part body,
In the molding step, the mounting portion main body and the refill are loaded into predetermined positions in a mold corresponding to the shape of the elastic member, and a resin material that becomes the elastic member is injected into the mold and solidified. The method of manufacturing a wiper blade according to claim 6. The method for manufacturing a wiper blade according to any one of claims 6 to 8, further comprising a coloring step of coloring a surface of the elastic member.

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