JP2014083885A - Manufacturing method of lever for wiper, and lever for wiper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a lever for a wiper capable of suppressing generation of weld.SOLUTION: The manufacturing method of a yoke lever 25 made of a resin which constitutes a part of a wiper, in which a coupling storage part 25b is formed on the center in the longitudinal direction, and which is connected rotatably to an intermediate engaging part 24d stored in the coupling storage part 25b, includes an injection step for injecting a molten resin in the state where a weld suppression part 55 is arranged on a resin confluence position on the downstream side of a position corresponding to a longitudinal direction downstream side end of the coupling storage part 25b in a cavity 53.

Description

  The present invention relates to a method for manufacturing a wiper lever that constitutes a part of a wiper, and a wiper lever.

  2. Description of the Related Art Conventionally, a wiper provided in a vehicle includes a wiper lever that is rotatably connected. And as such a wiper lever, it is made of resin, a connection housing part is formed in the center in the longitudinal direction, and is connected to the connection part accommodated in the connection housing part so as to be rotatable. There is something to configure (see, for example, Patent Document 1).

  Such a wiper lever is generally molded by injecting molten resin into a cavity constituted by a mold.

International Publication (WO) 2010/035794

  However, in the wiper lever manufacturing method as described above, for example, in the injection step of injecting molten resin from one end side (upstream side) in the longitudinal direction of the wiper lever, the short side of the downstream end portion in the longitudinal direction of the connection housing portion is short. The molten resin will merge at a position corresponding to the center in the hand direction, and there is a possibility that a weld may be generated so as to extend downstream from the position. This causes, for example, the wiper lever to break from the weld portion when assembled with the connecting portion.

  The present invention has been made to solve the above problems, and an object thereof is to provide a wiper lever manufacturing method and a wiper lever that can suppress the occurrence of welds.

  A manufacturing method of a lever for a wiper that solves the above-mentioned problem forms a part of the wiper, a connection housing portion is formed in the center in the longitudinal direction, and is rotatably connected to the connection portion housed in the connection housing portion A method for manufacturing a resin wiper lever, which is melted in a state in which a weld restraining member is disposed at a resin joining position on the downstream side of the cavity corresponding to the downstream end in the longitudinal direction of the connection housing portion. An injection process for injecting resin is provided.

  According to this method, in the injection step, the molten resin is injected in a state where the weld suppression member is disposed at the downstream side of the joint accommodating portion in the cavity corresponding to the downstream end portion in the longitudinal direction. . Then, the flow of the molten resin is controlled by the weld suppressing member and can be merged satisfactorily, and it is possible to suppress the occurrence of weld from the end portion on the downstream side in the longitudinal direction of the connection housing portion in the wiper lever. Specifically, for example, the length of the weld generated so as to extend downstream from the center in the lateral direction of the end portion on the downstream side in the longitudinal direction of the connection housing portion can be shortened. When being accommodated in and connected to each other, the occurrence of cracks from the weld portion can be suppressed.

In the method for manufacturing a wiper lever, in the injection step, the weld suppression member is preferably disposed in a pair so as to sandwich a center line in the short direction of the connection housing portion.
According to this method, when the molten resin is merged at the resin merging position on the downstream side of the position corresponding to the longitudinal downstream end of the connection housing portion in the injection process, the molten resin flows at the pair of weld suppression members. Are controlled in the direction in which they collide with each other (the direction approaching the short direction center line), and the occurrence of welds can be satisfactorily suppressed.

  A wiper lever that solves the above-mentioned problem is a resin that forms part of a wiper, a connection housing portion is formed at the center in the longitudinal direction, and is rotatably connected to the connection portion housed in the connection housing portion. The wiper lever is made of a weld restraining recess in the vicinity of the end portion in the longitudinal direction of the connection housing portion.

  According to the same configuration, since the weld suppressing concave portion is formed in the vicinity of the longitudinal end portion of the connection housing portion, the molten resin can be satisfactorily merged in the injection process, and from the longitudinal end portion of the connection housing portion. Generation of welds can be suppressed.

  According to the wiper lever manufacturing method of the present invention, the occurrence of welds can be suppressed. Further, the wiper lever of the present invention can suppress the occurrence of welds.

The perspective view which shows the wiper for vehicles in this Embodiment. (A) is a top view of the wiper blade of this Embodiment. (B) is a front view of the wiper blade. (A) is a partial cross section figure of the wiper blade in this Embodiment. (B) is the top view of a yoke lever similarly. (C) is a side view of the yoke lever. (D) is a partially enlarged bottom view of the yoke lever. (E) is a ZZ sectional view in Drawing 3 (c). (A) is AA sectional drawing in Fig.3 (a). (B) is BB sectional drawing in Fig.3 (a). (C) is CC sectional drawing in Fig.3 (a). (D) is DD sectional drawing in Fig.3 (a). (E) is EE sectional drawing in Fig.3 (a). (F) is FF sectional drawing in Fig.3 (a). (G) is GG sectional drawing in Fig.3 (a). (H) is HH sectional drawing in Fig.3 (a). The partially expanded bottom view of the yoke lever in another example. The partially expanded bottom view of the yoke lever in another example.

Hereinafter, an embodiment will be described with reference to FIGS.
FIG. 1 shows a wiper 11 for a vehicle that wipes raindrops and the like adhering to a wiping surface 1a of a windshield (windshield glass) 1 of an automobile. The vehicle wiper 11 includes a wiper arm 12 and a wiper blade 13. The wiper arm 12 is fixed to a pivot shaft (not shown) whose base end is reciprocated at a predetermined angle by a driving force of a wiper motor (not shown), and reciprocally swings as the pivot shaft reciprocates. Do exercise. The wiper blade 13 is connected to the tip of the wiper arm 12 via a connection clip 14 so as to be rotatable. The wiper arm 12 is provided with a spring (not shown) for applying a pressing force for pressing the wiper blade 13 against the wiping surface 1a.

As shown in FIGS. 2 and 3, the wiper blade 13 includes a lever member 21, a blade rubber 22, and two movable cover members 23.
The lever member 21 includes a main lever 24 whose longitudinal intermediate portion is rotatably connected to the tip of the wiper arm 12, and a longitudinal intermediate portion pivoting relative to both longitudinal end portions of the main lever 24. The two yoke levers 25 as wiper levers that can be connected are formed in a tournament shape.

  Specifically, the main lever 24 is made of a resin material, and has a generally U-shaped cross section in the longitudinal direction (opened on the wiping surface 1a side) as a whole, and an upper portion (from the wiping surface 1a) of the middle portion in the longitudinal direction. An upper opening 24a (see FIGS. 1, 2A, and 3A) penetrating in the vertical direction (perpendicular to the wiping surface 1a) is formed in the portion on the separating side. Further, a connecting shaft 24b (see FIGS. 2 and 3A) that connects the side walls is formed between a pair of side walls at a position corresponding to the upper opening 24a of the main lever 24. It is connected to the tip of the wiper arm 12 via the connecting clip 14 (see FIG. 1).

  Further, as shown in FIGS. 3 (a) and 4 (a), the gap between the pair of side walls is narrow on the both sides in the longitudinal direction of the position corresponding to the upper opening 24a in the main lever 24, and the gap is in the vertical direction. A main lever engaging portion 24c that is constant (in the vertical direction of the wiping surface 1a) is formed. In FIG. 3A, approximately half of the wiper blade 13 (half extending further from the tip of the wiper arm 12) is shown, but the opposite side has the same shape.

  Further, as shown in FIGS. 3A, 4B, and 4C, at both ends in the longitudinal direction of the main lever 24, a convex shape extending along the longitudinal direction (convex shape toward the wiping surface 1a) is provided. ) And a pivot that protrudes in the width direction (wiping direction and in the left-right direction in FIG. 4C) from the tip in the longitudinal center of the intermediate engagement portion 24d. A shaft portion 24e is formed. Note that the top surface of the intermediate engagement portion 24d is formed so as to be inclined so that the protruding amount decreases as the distance from the rotation shaft portion 24e in the longitudinal direction increases. Further, the lower half of the top surface of the rotating shaft portion 24e is formed so as to be inclined so that the amount of protrusion decreases as it goes downward.

  The yoke lever 25 is made of a resin material, and most of the yoke lever 25 is formed in a long shape that can be accommodated in the main lever 24. As shown in FIGS. 3 and 4B and 4C, the rotary shaft portion 24e is provided at the upper portion (the portion on the side away from the wiping surface 1a) of the yoke lever 25 in the longitudinal direction center. A rotation support recess 25a (see FIG. 4C) extending in the width direction (wiping direction) to support the rotation and a top side of the intermediate engagement portion 24d in communication with the rotation support recess 25a. A concave connection housing portion 25b for housing is formed. The connection housing portion 25b is disengaged with the intermediate engagement portion 24d with respect to the rotation of the yoke lever 25 (not engaged within a range where the inclined top portion of the intermediate engagement portion 24d does not contact) and in the width direction ( It is formed so as to engage with the intermediate engaging portion 24d in the wiping direction).

  Further, gripping portions 25c (see FIG. 4E) for gripping the blade rubber 22 are formed at both ends in the longitudinal direction of the yoke lever 25. The grip portion 25 c extends downward from both sides in the width direction and bends toward the side where the tips approach each other to grip the upper portion 22 a of the blade rubber 22.

  Here, the blade rubber 22 is formed in a long shape with a rubber material, and as described above, the upper portion 22a held by the holding portion 25c, and the wiping portion 22b extending downward (in the direction of the wiping surface 1a) from the upper portion 22a. It is what has. A pair of backings 26 made of a metal material are mounted on the upper portion 22a of the blade rubber 22, and this backing 26 disperses the pressing force applied to the wiping surface 1a received from the wiper arm 12 in the longitudinal direction, so that the gripping portions 25c The follow-up end 22c (see FIG. 3A) of the blade rubber 22 protruding in the longitudinal direction from the gripping portion 25c at the end also serves to press the wiping portion 22b against the wiping surface 1a.

  Further, as shown in FIGS. 3 (b) and 3 (c), an inner engagement portion 25d projecting in the longitudinal direction from the gripping portion 25c and an outer side at the center in the width direction at both longitudinal ends of the yoke lever 25 are provided. An engaging portion 25e is formed.

  As shown in FIG. 4 (a), the inner engagement portion 25d has a width (width in the wiping direction) set to be substantially the same (slightly smaller) as the width of the main lever engagement portion 24c. It is set so as to engage in the wiping direction (width direction) without being engaged in the direction orthogonal to the portion 24c and the wiping surface 1a.

The outer engagement portion 25e is formed in the same shape as the inner engagement portion 25d.
Further, as shown in FIGS. 3A to 3C and FIG. 4D, in the yoke lever 25, a support that is recessed from both sides in the width direction is provided between the connecting housing portion 25b and both ends in the longitudinal direction. A recess 25f is formed. The rotation shaft portion 23a of the movable cover member 23 is rotatably supported by the support recess 25f on the outer engagement portion 25e side of the yoke lever 25.

  Specifically, the movable cover member 23 is made of a resin material, and has a cross section in a direction orthogonal to the longitudinal direction (opened on the wiping surface 1a side) so as to substantially cover the yoke lever 25 protruding from the longitudinal end portion of the main lever 24. It is formed in a U-shape, and the rotation shaft portion 23a (see FIG. 4d) is projected on both side walls on the base end side in the longitudinal direction.

  Further, at the front end in the longitudinal direction of the movable cover member 23, the following end 22c (the upper part 22a) of the blade rubber 22 projecting in the longitudinal direction from the grips 25c at the ends of all the grips 25c of each yoke lever 25. The holding part 23b (refer FIG.4 (h)) for hold | maintaining is formed. The holding portion 23 b extends downward from both sides in the width direction and bends toward the side where the tips approach each other to hold the upper portion 22 a of the follow-up end portion 22 c of the blade rubber 22.

  Further, the movable cover member 23 has a follow-up end portion 22c (to restrict the movement and fall (posture) in the wiping direction of the follow-up end portion 22c between its own holding portion 23b and the gripping portion 25c of the yoke lever 25. A pair of restricting portions 23c (see FIG. 4G) extending downward from both sides in the width direction so as to sandwich the upper portion 22a) is formed.

  Further, as shown in FIGS. 3A and 4F, a pair of movable cover member 23 is located on the distal end side of rotating shaft portion 23a and corresponding to outer engagement portion 25e. The interval between the side walls is narrow and constant in the vertical direction (perpendicular to the wiping surface 1a) (same as the main lever engaging portion 24c), and the wiping direction is disengaged in the direction perpendicular to the outer engaging portion 25e and the wiping surface 1a. A cover engaging portion 23d that engages in the (width direction) is formed.

  In the present embodiment, the main lever 24 forms the appearance of the wiper blade 13 together with the movable cover member 23. Then, on the front side of the vehicle at the main lever 24 (the front side in the attached state), the first fin surface 32 that generates a force that presses the blade rubber 22 against the wiping surface 1a when receiving the traveling wind during traveling of the vehicle. (See FIG. 2A and FIG. 4) is formed along the longitudinal direction. Further, on the front side of the movable cover member 23 (the front side in the attached state), a second fin surface that generates a force that presses the blade rubber 22 against the wiping surface 1a when receiving the traveling wind during traveling of the vehicle. 33 (refer to FIG. 2A and FIG. 4) is formed continuously with the first fin surface 32 along the longitudinal direction. The fin surfaces 31 (first and second fin surfaces 32 and 33) formed on the main lever 24 and the movable cover member 23 are continuous over the entire longitudinal direction of the wiper blade 13 in cooperation with each other. It is formed to have a good appearance.

  Further, as shown in FIGS. 3B to 3E, in the yoke lever 25 of the present embodiment, a weld suppressing recess 25g is formed in the vicinity of the end portion in the longitudinal direction of the connection housing portion 25b. The weld suppressing recess 25g is formed corresponding to the resin joining position where the molten resin joins in the injection process at the time of manufacture. A pair of weld suppressing recesses 25g of the present embodiment is formed so as to sandwich a short direction (width direction) center line L (see FIG. 3E) of the connection housing portion 25b. Further, the weld suppressing concave portion 25g is formed so as to extend in parallel with the lateral direction center line L. Further, the weld suppressing recess 25g is a recess that opens downward (on the opposite side to the connection housing portion 25b).

  Here, a manufacturing method of the yoke lever 25 will be described. As shown in FIG. 3E, the method for manufacturing the yoke lever 25 of this embodiment includes an injection step of injecting a molten resin into a cavity 53 constituted by an upper mold 51 and a lower mold 52. As schematically shown in FIG. 3B, the injection process of the present embodiment is performed at one end in the longitudinal direction of the yoke lever 25, that is, on the side corresponding to the inner engagement portion 25d (in FIG. 3B). The molten resin is injected from the gate 54 on the left side. In the injection process, a weld restraining member is provided at the downstream side of the joint housing portion 25b in the longitudinal direction (in this embodiment, the end on the outer engagement portion 25e side) at the downstream side of the resin joining position. The molten resin is injected in a state where the weld suppression portion 55 (see FIG. 3E) is arranged. Note that the weld suppression portion 55 of this embodiment is formed integrally with the lower mold 52. Also, a pair of weld suppression portions 55 of the present embodiment is arranged so as to sandwich the short-side center line L of the connection housing portion 25b so that the weld suppression recess 25g is formed, and each weld suppression portion 55 is It is formed so as to extend in parallel with the short direction center line L.

Next, the effect | action of the manufacturing method of this embodiment is demonstrated.
In the injection process in the manufacturing method of the present embodiment, when molten resin is injected from the gate 54, first, the upstream end portion in the longitudinal direction of the connection housing portion 25b (the end portion on the inner engagement portion 25d side in this embodiment) At a corresponding position, the molten resin divides outward in the width direction and flows downstream. A part of the flow of the molten resin in the cavity 53 is controlled by colliding with the weld suppressing portion 55 at the downstream side resin joining position corresponding to the longitudinal downstream end portion of the connection housing portion 25b. They are also directed toward the direction of collision with each other (inward in the width direction) and merge. That is, at the end portion on the downstream side in the longitudinal direction of the connection housing portion 25 b, a part of the molten resin joins in a state where it is difficult to flow in the longitudinal direction of the yoke lever 25. As a result, in the yoke lever 25 formed by hardening the molten resin thereafter, the generation of welds (more specifically, the size of the welds) from the end portion on the downstream side in the longitudinal direction of the connection housing portion 25b is suppressed.

  In addition, the size of the weld is not stable if the flow speed differs due to the viscosity of the molten resin used or the pressure at the time of injection, but the flow direction is changed by controlling part of the molten resin flow. Thus, the size of the weld can be stabilized. That is, it is possible to suppress the weld from becoming structurally larger than a predetermined size.

Next, the characteristic effects of the above embodiment will be described below.
(1) In the injection step, the molten resin is injected in a state where the weld suppression portion 55 is disposed at the downstream side of the cavity 53 corresponding to the downstream end of the connection housing portion 25b in the longitudinal direction. . Then, the flow of the molten resin is controlled by the weld suppressing portion 55 and can be merged well. In the yoke lever 25, the weld is greatly (longer) generated from the end portion on the downstream side in the longitudinal direction of the connection housing portion 25b. Can be suppressed. Specifically, for example, the length of the weld generated so as to extend downstream from the center in the lateral direction of the end portion on the downstream side in the longitudinal direction of the connection housing portion 25b can be shortened, and as a result, the intermediate engagement portion 24d. Can be prevented from being cracked from the welded portion, for example, when being accommodated in the coupling accommodating portion 25b.

  (2) In the injection process, a pair of weld suppression portions 55 are arranged so as to sandwich the short-side center line L of the connection housing portion 25b. Therefore, when the molten resin merges at the downstream resin merging position corresponding to the longitudinal downstream end of the connection housing portion 25b in the injection process, the flow of the molten resin flows between the pair of weld restraining portions 55. It is controlled in the collision direction (the direction approaching the short direction center line L), and the size of the weld can be satisfactorily suppressed.

The above embodiment may be modified as follows.
In the above-described embodiment, each weld suppression recess 25g (each weld suppression portion 55) is formed so as to extend in parallel with the lateral center line L of the connection housing portion 25b, but is not limited thereto. It is good also as a concave part for weld control (weld control part) of a different shape.

  For example, as shown in FIG. 5, a pair of weld suppression concave portions 25 h (weld suppression portions) are formed so as to be closer to each other as the distance from the position corresponding to the downstream end in the longitudinal direction of the connection housing portion 25 b is increased. Also good.

Further, for example, as shown in FIG. 6, each weld suppressing recess 25 i (weld suppressing portion) may be formed in a circular shape when viewed from the recessed direction of the connection housing portion 25 b.
In the above embodiment, the weld suppression concave portion 25g (weld suppression portion 55) is provided as a pair so as to sandwich the short-side center line L of the connection housing portion 25b, but the occurrence of welds (the size of the weld) If the flow of the molten resin can be controlled (disturbed) so as to be suppressed, only one or three or more may be provided.

In the above embodiment, the direction in which the concave portion 25g for suppressing welds is provided and the direction in which the concave portion 55 is provided may be changed.
For example, a weld suppression portion (weld suppression member) may be provided so as to protrude from the outer side in the width direction toward the inner side in the width direction, and a concave portion for weld suppression that is recessed from the outer side in the width direction toward the inner side in the width direction may be formed.

  In the above-described embodiment, the support recess 25f is formed at a position far away from the connection housing portion 25b. However, a position where the flow of the molten resin can be controlled (disturbed) so that the size of the weld is suppressed ( It is also possible to form the support concave portion in common with the weld suppression concave portion by forming it at the downstream side resin merging position corresponding to the longitudinal downstream end of the connection housing portion 25b.

  In the above embodiment, the position of the gate 54 for injecting the molten resin into the cavity 53 is set at one end in the longitudinal direction of the yoke lever 25. However, the present invention is not limited to this. It may be between 25b. If a gate is set at a position corresponding to the connection receiving portion 25b, a weld is generated on the side opposite to the gate in the connection receiving portion 25b, that is, in the width direction of the yoke lever 25. Is likely to occur. However, since the gate is set between the longitudinal end of the yoke lever 25 and the connecting housing portion 25b, the molten resin flows from one side of the connecting housing portion 25b in the longitudinal direction to the other side, and the weld is also in the longitudinal direction. Therefore, cracking when the yoke lever 25 is connected is prevented.

  In the above embodiment, the weld suppressing portion 55 is formed integrally with the lower mold 52. However, the present invention is not limited to this, and a separate weld suppressing member is fixedly provided, and the injection step is performed. You may implement.

  In the above embodiment, the method of manufacturing the yoke lever 25 in the vehicle wiper 11 is described. However, the method may be embodied in another method of manufacturing a wiper lever in a different type of wiper. For example, the secondary lever in the so-called tournament-like wiper in which the center lever, the secondary lever, and the yoke lever are rotatably connected in this order from the top is assumed to be made of resin in which the connecting housing portion is formed. You may actualize as a manufacturing method.

The technical ideas that can be grasped from the above embodiments are described below.
(A) In the wiper lever manufacturing method according to claim 2, in the injection step, each of the weld restraining members is formed to extend in parallel with the lateral center line. Lever manufacturing method.

  (B) In the method for manufacturing a wiper lever according to claim 2, in the injection step, the pair of weld suppressing members come closer to each other as they are separated from a position corresponding to the longitudinal downstream end of the connection housing portion. A method for manufacturing a wiper lever, characterized by being formed as described above.

  (C) The wiper lever manufacturing method according to claim 2, wherein, in the injection step, each of the weld suppression members is formed in a circular shape when viewed from the recessed direction of the connection housing portion. Manufacturing method of the lever.

  L ... Center line in the short direction, 11 ... Wiper, 24d ... Intermediate engagement portion (connection portion), 25b ... Connection housing portion, 25g, 25h, 25i ... Weld suppression recess, 53 ... Cavity, 55 ... Weld suppression portion ( Weld suppression member).

Claims (3)

This is a method of manufacturing a resin wiper lever that constitutes a part of a wiper, a connection housing portion is formed at the center in the longitudinal direction thereof, and is rotatably connected to the connection portion housed in the connection housing portion. And
A wiper comprising an injection step of injecting a molten resin in a state where a weld restraining member is arranged at a downstream resin joining position corresponding to a downstream end portion in the longitudinal direction of the connection housing portion in the cavity. Manufacturing method of the lever. In the manufacturing method of the lever for wipers according to claim 1,
In the injection step, a pair of the weld restraining members are arranged so as to sandwich a center line in the short direction of the connection housing portion. A resin wiper lever that constitutes a part of the wiper, a connection housing portion is formed at the center in the longitudinal direction, and is rotatably connected to the connection portion housed in the connection housing portion,
A wiper lever characterized in that a weld suppressing recess is formed in the vicinity of the longitudinal end of the connection housing portion.