JP2008168831A - Wiper arm and wiper for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper arm capable of thinning its profile by reducing a height dimension. <P>SOLUTION: The wiper arm 11 is configured so that an arm member 13 and spring guides 21, 22 are arranged so as to cross over a fixation hole disposed on an arm head 12 for fixing a pivot shaft 2 from each connecting part 12b, 12d to the arm head 12. The spring guides 21, 22 are equipped with detour sections 21c, 22c which laterally bypass a nut 3 fastened on the front edge of the pivot shaft 2 projecting upward from the fixation hole disposed on the arm head 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wiper arm comprising an urging mechanism in which an arm member is rotatably connected to an arm head fixed to a pivot shaft and urges the distal end side of the arm member to the wiping surface side across both members. And a vehicle wiper including the wiper arm.

  A wiper arm of a vehicle wiper has an arm member rotatably connected to an arm head fixed to a pivot shaft of the vehicle, and a coil spring that biases the distal end side of the arm member toward the wiping surface side includes an arm head and an arm. It is constructed so as to straddle between the members.

Among them, for example, in the wiper arm disclosed in Patent Document 1, the arm member is connected to the base end side portion of the arm with respect to the fixing hole of the arm head, and one end of the spring guide on which the coil spring is mounted is also the base end side portion. The arm member and the spring guide are configured so as to straddle the fixing holes of the arm head from the respective connecting portions. In this case, the arm head is formed with a connecting portion for connecting with one end of the spring guide upward, and the spring guide is disposed further above the fixing hole of the arm head and fitted into the fixing hole. It is configured to prevent interference with the distal end portion of the pivot shaft that is inserted and protrudes upward and the nut fastened to the distal end portion.
West German Patent Application Publication No. 1205402

  However, in the wiper arm configured as described above, in order to prevent the spring guide from interfering with the tip end portion of the pivot shaft and the nut fastened to the tip end portion, the connecting portion of the arm head that is connected to the spring guide protrudes high upward. Adopted a structure to let you. Therefore, the arm head is increased in size in the height direction from the wiping surface, which leads to an increase in the size of the wiper arm in the same direction.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a wiper arm and a vehicle wiper that can be reduced in thickness while suppressing the height dimension.

  In order to solve the above-mentioned problem, the invention according to claim 1 has a fixing hole for fixing to the pivot shaft, and a fastening member is fastened to the tip end of the pivot shaft that is inserted into the fixing hole. An arm head fixed to the shaft, a base end portion rotatably connected to the arm head, and a wiper blade for wiping the wiping surface attached to the tip portion; a coil spring; A coil spring is inserted and supported, and a spring guide that locks one end of the coil spring is housed inside the arm member, and a base end portion of the spring guide is rotatably connected to the arm head. An urging mechanism for engaging the other end of the coil spring with the arm member, and urging the tip of the arm member toward the wiping surface by the urging force of the coil spring; The arm member and the spring guide are wiper arms arranged so as to straddle the fixing hole of the arm head from the connecting portion of the arm head, and the spring guide is connected to the pivot shaft. The gist of the present invention is that a detour portion for detouring the fastening member used for fixing on the side thereof is provided.

  In this invention, the wiper arm is configured such that the arm member and the spring guide are arranged so as to straddle the fixing hole for fixing with the pivot shaft provided in the arm head from the connecting portion of the arm head. A bypass portion is provided to bypass a fastening member fastened to the tip of the pivot shaft protruding upward from the fixing hole of the arm head. In other words, since it is not necessary to configure the connecting portion of the arm head with the spring guide upward, the height from the wiping surface of the arm head can be reduced, and the wiper arm can be made thinner.

  The invention according to claim 2 is the wiper arm according to claim 1, wherein the spring guide and the coil spring are paired, and the spring guides are disposed on both sides of the fastening member, The gist of the invention is that each of the bypass portions is bypassed on both sides of the fastening member.

  In this invention, the spring guides are paired and the spring guides are arranged so as to bypass both sides of the fastening member at each bypass part, so that the arrangement is well balanced, and the urging force of the coil spring is stably stabilized. It can be applied to members and arm heads. In addition, since the coil springs are also paired, the urging force required for the wiper arm can be shared by each coil spring, so the wire diameter of each coil spring can be reduced and the outer diameter can be made smaller. Can contribute to

  According to a third aspect of the present invention, in the wiper arm according to the second aspect, each of the spring guides is provided with a stopper member that engages with an end portion of each of the coil springs. The gist is to be mounted across the spring guides and maintain the spacing between the spring guides.

  In this invention, the stopper member latched with the edge part of a coil spring is provided, The stopper member is mounted | worn so that it may straddle the spring guide which makes a pair, and the space | interval of each spring guide is hold | maintained. Accordingly, the spring guides can be prevented from approaching and separating from each other, and interference between the supporting coil springs or the arm member can be prevented. In addition, since the stopper member that is engaged with the end of the coil spring has a function of holding the gap between the spring guides, it is not necessary to separately provide a member for holding the gap, and an increase in the number of components can be suppressed.

  According to a fourth aspect of the present invention, in the wiper arm according to any one of the first to third aspects, the arm member has an opening that opens above the fixing hole of the arm head. The gist is that a cover for closing the opening is attached.

  In this invention, since the arm member is provided with an opening that opens above the fixing hole of the arm head, the fastening member can be attached to and detached from the tip of the pivot shaft in a state where the arm member is connected to the arm head. Moreover, since the opening part is obstruct | occluded with a cover, the external appearance performance of an arm member can be improved.

The invention according to claim 5 is a vehicle wiper configured by connecting a wiper blade for wiping the wiping surface to the tip of the wiper arm according to any one of claims 1 to 4.
In this invention, since the thin wiper arm according to any one of claims 1 to 4 is used, a thin vehicle wiper can be provided.

  Therefore, according to the above-described invention, it is possible to provide a wiper arm and a vehicle wiper that can be reduced in thickness while suppressing the height dimension.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the wiper 1 of the present embodiment is connected to a wiper arm 11 whose base end is fixed to a pivot shaft 2 of the vehicle, and is pivotally connected to a distal end of the wiper arm 11. The wiper blade (not shown) is configured to wipe the windshield surface (wiping surface) by the reciprocating swing of the pivot shaft 2 driven by the wiper motor.

  The wiper arm 11 includes an arm head 12, an arm member 13 that is rotatably connected to the arm head 12 by a connecting shaft (connecting pin 16) substantially parallel to the wiping surface, and the arm member 13 and the arm head 12. And an urging mechanism 14 that urges the tip of the arm member 13 toward the wiping surface.

  The arm head 12 has a fixing hole 12a for fixing to the pivot shaft 2 at a substantially central portion, and the tip end of the pivot shaft 2 is fitted into the fixing hole 12a and protrudes upward from the fixing hole 12a. When the nut 3 is fastened to the screw portion 2a of the portion, it is fixed so as to rotate together with the pivot shaft 2. A first connecting portion 12b is formed on the base end side (opposite end side of the arm member 13) from the fixing hole 12a of the arm head 12, and the first connecting portion 12b has a circular cross-section that penetrates in the width direction. A hole 12c is formed. The connection hole 12c is a hole for rotatably connecting an arm member 13 described later, and a cylindrical bearing 15 for smooth rotation of the arm member 13 is provided in the connection hole 12c. It is fixed to the surface.

  A second connecting portion 12d is formed in a portion near the fixing hole 12a at the top of the first connecting portion 12b. The second connecting portion 12d is formed with a connecting hole 12e having a circular cross section extending in the width direction and extending in parallel with the connecting hole 12c. The connection hole 12e is a hole for rotatably connecting with a pair of spring guides 21 and 22 described later. Incidentally, the connecting holes 12c and 12e are arranged such that straight lines passing through the respective centers are inclined at a predetermined angle θ (for example, about 30 ° to 50 °) toward the fixing hole 12a with respect to the axis orthogonal to the fixing hole 12a. ing.

  On the opposite side of the arm head 12 from the connecting portions 12b and 12d (the tip side of the arm member 13), a fitting support portion 12f that fits between side wall portions 13b described later of the arm member 13 is formed to project. . In the wiping operation by the wiper blade connected to the tip of the arm member 13, the fitting support portion 12 f comes into contact with the inner surface of the side wall portion 13 b of the arm member 13 when the wiping load acts on the arm member 13, and the wiping direction is The load acting on the connecting pin 16 between the arm member 13 and the arm head 12 is reduced by receiving the load.

  The arm member 13 has a taper shape from the proximal end portion connected to the arm head 12 toward the distal end portion, and the wiper blade is attached to the distal end portion. The arm member 13 has a substantially U-shaped cross section having an upper wall portion 13a and a pair of side wall portions 13b extending downward from both sides of the upper wall portion 13a, and is formed inside the upper wall portion 13a and each side wall portion 13b. An accommodation recess 13c (see FIG. 4) for accommodating the urging mechanism 14 is configured.

  13 d of connection pieces are each extended and formed in the base end part of each side wall part 13b from this side wall part 13b. Each connecting piece 13d is formed with a connecting hole 13e having a circular cross section corresponding to the insertion hole 15a inside the bearing 15 in the plate thickness direction. Each connecting piece 13d is arranged on both sides of the connecting portion 12b with respect to the first connecting portion 12b of the arm head 12, and is connected to each connecting hole 13e and the insertion hole 15a of the bearing 15 in a substantially cylindrical connecting pin. 16 is inserted and is prevented from coming off. As a result, the arm member 13 is connected to the first connecting portion 12b of the arm head 12 by the connecting pin 16 so that each connecting piece 13d at the base end is pivotable, and straddles the fixing hole 12a of the arm head 12. Are arranged as follows.

  An opening 13f is provided between the connecting pieces 13d so as to open above the fixing hole 12a of the arm head 12 and expose the tip end portion of the pivot shaft 2 fixed to the fixing hole 12a. . The opening 13f is configured such that the nut 3 can be tightened and removed from the pivot shaft 2 from above the arm member 13. A cover 17 for forming an external shape in cooperation with the arm member 13 together with the closing of the opening 13f is detachably attached to the connecting piece 13d. The cover 17 is provided with an extending portion 17 a that conceals the connecting pin 16 that connects the arm member 13 and improves the appearance performance of the wiper arm 11.

The urging mechanism 14 includes a pair of spring guides 21 and 22, a pair of coil springs 23 and 24, a proximal end stopper 25, and a distal end stopper 26.
Each of the spring guides 21 and 22 is formed in an elongated plate shape, and connection holes 21a and 22a having circular cross sections corresponding to the connection holes 12e provided in the second connection part 12d are formed in the base end portion so as to penetrate in the plate thickness direction. Has been. Each of the spring guides 21 and 22 has a base end portion disposed on both sides of the second connection portion 12d of the arm head 12, and a substantially cylindrical connection pin 27 is provided in each connection hole 21a, 22a, and 12e. It is inserted and prevented from coming off. As a result, the spring guides 21 and 22 are pivotally connected to the second connecting portion 12d of the arm head 12 by the connecting pins 27 at the base end portions so as to straddle the fixing holes 12a of the arm head 12. Be placed.

  Further, the spring guides 21 and 22 are formed with locking projections 21b and 22b projecting in the plate width direction at the substantially central portion in the longitudinal direction, and the tips are tapered. The spring guides 21 and 22 are inserted from a distal end portion into a pair of insertion holes 25a provided in the oval base end stopper 25, and the stoppers 25 are mounted so as to be locked to the locking projections 21b and 22b. Is done. After the proximal stopper 25 is mounted, the coil springs 23 and 24 are inserted and supported by the spring guides 21 and 22. The distal ends of the spring guides 21 and 22 are inserted into a pair of insertion holes 26 a provided in the distal end stopper 26, and the stoppers 26 are mounted so as to contact the springs 23 and 24.

  The tip stopper 26 is formed of a plate material and has a mounting piece 26b that is bent to the side opposite to the side where the coil springs 23 and 24 are arranged. A connecting hole 26c having a circular cross section is formed through the mounting piece 26b in the thickness direction. The distal end stopper 26 is attached to each side wall portion 13b by a substantially cylindrical connection pin 28 inserted through the connection hole 26c of the mounting piece 26b and the connection hole 13g having a circular cross section provided in each side wall portion 13b of the arm member 13. It is attached to. In this case, the coil springs 23 and 24 between the distal end stopper 26 and the proximal end stopper 25 are in a compressed state. The tip portions of the spring guides 21 and 22 are placed on the connecting pin 28 and press the connecting pin 28 by the urging force of the coil springs 23 and 24. Thereby, the pressing force which presses the front-end | tip part of the arm member 13 to the wiping surface side arises. Further, the distal end stopper 26 and the proximal end stopper 25 also have a function of maintaining the distance between the spring guides 21 and 22.

  Between the locking projections 21b and 22b of the spring guides 21 and 22 and the connecting holes 21a and 22a, detour portions 21c and 22c that protrude in a circular arc shape outwardly in the width direction are respectively provided. When the arm head 12 is fixed to the pivot shaft 2, each of the bypass portions 21 c and 22 c not only interferes with the nut 3 fastened to the tip portion but also with the tool for fastening the nut 3. It is provided to avoid on the side. That is, the spring guides 21 and 22 can be arranged on the side of the nut 3, and the height of the arm member 13 in the nut 3 portion is configured to be low, so that the wiper arm 11 is thinned.

  Further, by providing the spring guides 21 and 22 with the detour portions 21c and 22c, the portions other than the detour portions 21c and 22c are arranged close to each other. That is, the width dimension of the second connecting portion 12d that connects the spring guides 21 and 22 and the gap between the coil springs 23 and 24 can be set small, and the arm member 13, that is, the wiper arm 11, can be prevented from being enlarged in the width direction. ing.

  Further, since the bypass thread 21c, 22c provided in each spring guide 21, 22 avoids the tip screw portion 2a of the pivot shaft 2 and the nut 3 fastened to the tip screw portion 2a, the arm member 13 is moved to the arm head 12. On the other hand, the nut 3 can be fastened to the tip screw portion 2a of the pivot shaft 2 without taking the standing posture. Accordingly, the wiper arm 11 can be easily and appropriately fastened and fixed while being matched with a specified set position (marking or the like applied to the vehicle) with respect to the vehicle. In Patent Document 1, when the arm head of the wiper arm is fixed to the distal end portion of the pivot shaft, the arm member must be fastened and fixed with the arm member standing in the upright position, and the wiper arm is set to the vehicle. The fastening work in a state matched to the position was difficult.

Next, characteristic actions and effects of the present embodiment will be described.
(1) The wiper arm 11 of the present embodiment is configured so that the arm member 13 and the spring guides 21 and 22 are fixed to the pivot shaft 2 provided on the arm head 12 from the connecting portions 12b and 12d with the arm head 12. It is arranged so as to straddle the fixed hole 12a. The spring guides 21 and 22 are provided with bypass portions 21c and 22c for bypassing the nut 3 fastened to the tip screw portion 2a of the pivot shaft 2 protruding upward from the fixing hole 12a of the arm head 12 on the side thereof. It has been. That is, it is not necessary to configure the connecting portion of the arm head 12 with the spring guides 21 and 22 to protrude upward, so that the height of the arm head 12 can be configured to be low. As a result, the wiper arm 11 can be reduced in thickness and can be configured as a thin vehicle wiper 1.

  (2) The spring guides 21 and 22 and the coil springs 23 and 24 of the present embodiment form a pair, and the spring guides 21 and 22 are disposed on both sides of the nut 3 and are respectively connected to the bypass portions 21c and 22c. The side of the nut 3 is bypassed. That is, since the spring guides 21 and 22 are arranged so as to bypass both sides of the nut 3, the arrangement is balanced, and the urging force of the coil springs 23 and 24 is stably applied to the arm member 13 and the arm head 12. Can be granted. Since the coil springs 23 and 24 are also paired, the urging force required for the wiper arm 11 can be shared by the coil springs 23 and 24. Therefore, the wire diameters of the individual coil springs 23 and 24 are reduced and the outer diameter is reduced. This can also contribute to reducing the thickness of the wiper arm 11.

  (3) In the present embodiment, stoppers 25 and 26 that are engaged with the ends of the coil springs 23 and 24 are provided, and the stoppers 25 and 26 straddle the spring guides 21 and 22 that make a pair. The space | interval of each spring guide 21 and 22 is mounted | worn and is hold | maintained. Thereby, the spring guides 21 and 22 can be prevented from approaching and separating from each other, and interference with the supporting coil springs 23 and 24 or the arm member 13 can be prevented. In addition, since the stoppers 25 and 26 that are engaged with the ends of the coil springs 23 and 24 have a function of holding the gap between the spring guides 21 and 22, it is not necessary to separately provide a member for holding the gap. An increase in the number of parts can be suppressed.

  (4) Since the arm member 13 of the present embodiment has an opening 13f that opens above the fixing hole 12a of the arm head 12, the arm member 13 is connected to the arm head 12. The nut 3 can be attached to and detached from the tip of the pivot shaft 2. Further, since the opening 13f is closed by the cover 17, the appearance performance of the arm member 13 can be improved.

The embodiment of the present invention may be modified as follows.
In the above embodiment, the detour portions 21c and 22c of the spring guides 21 and 22 are curved in an arc shape, but the shape is not limited to this, and may be changed as appropriate, for example, bent into a square shape.

  In the above embodiment, the spring guides 21 and 22 and the coil springs 23 and 24 are paired, and the spring guides 21 and 22 are arranged on both sides of the nut 3. However, each of the spring guides and the coil springs is constituted by one. May be. In this case, the spring guide may be bypassed on one side of the nut 3 or may be bypassed on both sides of the nut 3 as a fork.

  In the above embodiment, the cover 17 that closes the opening 13f of the arm member 13 is detachably attached to the arm member 13. For example, the cover 17 is rotatably attached to the arm member 13, The opening 13f may be openable and closable. The cover 17 may be omitted.

  In the above embodiment, the stoppers 25 and 26 attached to the spring guides 21 and 22 include a function of maintaining a mutual distance. For example, the stoppers are attached to the spring guides 21 and 22, respectively, and the coil spring 23 is simply installed. , 24 may be configured to be locked to the end portions. Further, for example, the base end stopper 25 may be omitted by directly engaging the end portions of the spring guides 21 and 22 with the locking projections 21b and 22b provided on the spring guides 21 and 22.

It is a perspective view of the wiper arm of the wiper for vehicles in this embodiment. It is a disassembled perspective view of the wiper arm of this Embodiment. It is an expansion perspective view of the wiper arm of this embodiment. It is an enlarged plan view of the wiper arm of the present embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Pivot shaft, 3 ... Nut as a fastening member, 11 ... Wiper arm, 12 ... Arm head, 12a ... Fixed hole, 12b ... 1st connection part as a connection part, 12d ... 2nd connection part as a connection part, 13 ... arm member, 13f ... opening, 14 ... biasing mechanism, 17 ... cover, 21 ... spring guide, 21c ... detour part, 22 ... spring guide, 22c ... detour part, 23 ... coil spring, 24 ... coil spring, 25 ... a base end stopper as a stopper member, 26 ... a front end stopper as a stopper member.

Claims (5)

An arm head that has a fixing hole for fixing to the pivot shaft, and is fastened to the pivot shaft by tightening a fastening member at the distal end of the pivot shaft fitted into the fixing hole;
An arm member whose base end is rotatably connected to the arm head, and a wiper blade for wiping the wiping surface is attached to the tip;
Consists of a coil spring and a spring guide that inserts and supports the coil spring and locks one end of the coil spring. The spring guide is housed inside the arm member, and the base end of the spring guide can be rotated by the arm head. An urging mechanism for connecting the other end of the coil spring to the arm member and urging the tip of the arm member toward the wiping surface by the urging force of the coil spring;
The arm member and the spring guide are wiper arms arranged so as to straddle the fixing hole of the arm head from the connecting portion of the arm head,
The wiper arm according to claim 1, wherein the spring guide is provided with a detour portion for detouring the fastening member used for fixing to the pivot shaft on a side thereof. The wiper arm according to claim 1,
The spring guide and the coil spring are each paired,
Each of the spring guides is disposed on both sides of the fastening member, and is bypassed on both sides of the fastening member at each bypass portion. The wiper arm according to claim 2,
Each of the spring guides is provided with a stopper member that engages with an end of each of the coil springs.
The wiper arm according to claim 1, wherein the stopper member is mounted across the spring guides and maintains a distance between the spring guides. The wiper arm according to any one of claims 1 to 3,
The wiper arm, wherein the arm member has an opening that opens above the fixing hole of the arm head, and a cover that closes the opening is attached.   A wiper for a vehicle, comprising a wiper blade for wiping the wiping surface connected to the tip of the wiper arm according to any one of claims 1 to 4.

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