JP4450642B2 - Wiper arm - Google Patents

Description

  The present invention relates to a wiper arm provided in a vehicle wiper device, and more particularly to an improvement in which a compression spring for generating a pressing force on a wiper blade can be efficiently assembled in the wiper arm.

  A vehicle such as an automobile is provided with a wiper device for wiping the glass surface. Such a wiper device generally includes a wiper blade that wipes the glass surface, a wiper arm that supports the wiper blade, a wiper link that is linked to the wiper arm, and a motor that drives the wiper arm via the wiper link. It consists of.

  FIG. 7 shows an example of a wiper arm in such a conventional wiper device. As illustrated, the wiper arm 101 includes an arm piece 102, a retainer 103, and an arm head 104. The arm piece 102 is connected to a wiper blade (not shown) at a U hook portion 111 at the tip, and is fixed to the retainer 103 by a rivet 115. The retainer 103 is rotatably attached to the vicinity of the tip of the arm head 104 by a support pin 116. In the figure, only the vicinity of the tip of the arm head 104 is shown, but the arm head 104 is connected to the wiper link on the base end side.

  A guide pin 5 is rotatably attached to the arm head 104 by a support pin 117. A spring 106 is disposed around the guide pin 5 in a compressed state. The base end of the spring 106 is disposed on the spring receiving portion 5 </ b> A of the guide pin 5 via the washer 18. The tip of the spring 106 is disposed on the base end portion 112 of the arm piece 102 via the spring stopper 107. The spring 106 is for generating a pressing force to the wiper blade by the spring force.

  9 and 10 show the spring stopper 107. As shown in the figure, the spring stopper 107 includes a positioning hole 121 into which the tip end side of the guide pin 105 is inserted in the vicinity of the center thereof. As a result, the movement of the guide pin 105 with respect to the spring 106 is restricted within the positioning hole 121, and the generation of noise due to the contact between the spring 106 and the guide pin 105 is suppressed.

  FIG. 11 shows a state before the spring 106 is assembled to the wiper arm 101. As shown, the spring 106 before assembly is in a longer natural length than the compressed spring 106 after assembly. In the assembling operation, the guide pin 105 is rotated so as to be parallel to the retainer 103 while compressing the spring 106 so that the spring stopper 107 comes outside the base end portion 112 of the arm piece 102 (right side in the figure). Let

  However, the conventional wiper arm 101 cannot always perform such assembling work smoothly. For example, the conventional wiper arm 101 does not have means for disposing a spring stopper 107 attached to the tip of the spring 106 at an appropriate initial position at the start of assembly work. For this reason, as shown in FIG. 11, the spring stopper 107 may enter the back side (left side in the drawing) of the arm piece base end portion 112, and the assembling work may not be performed smoothly.

  The present invention has been made paying attention to such problems, and in a wiper arm having a compression spring for generating a pressing force to the wiper blade, the compression spring can be efficiently assembled. The purpose is to provide things.

The present invention relates to a wiper arm provided in a wiper device, an arm piece connected to a wiper blade, a retainer to which the arm piece is fixed, an arm head rotatably connected to the retainer, A guide pin rotatably supported with respect to the arm head, a spring disposed in a compressed state around the guide pin, and a spring stopper interposed between the spring and the arm piece, A locking portion is provided on the spring stopper, and the locking portion of the spring stopper is temporarily placed on the arm piece when the spring is assembled.

The locking portion may be a protrusion extending from the spring stopper.
The spring stopper may include a spring placement surface on which the spring is placed and an arm piece abutment surface that abuts on the arm piece, and the protrusion may extend toward the spring placement surface. .

The arm piece may include a base end portion bent in an L shape, and the locking portion may be placed on the top of the base end portion of the arm piece.
The spring stopper may include a positioning hole into which the tip of the guide pin is inserted.

  According to the present invention, in the wiper arm, in order to generate a pressing force to the wiper blade, a compressed spring is provided. The spring stopper interposed between the spring and the arm piece has a locking portion ( For example, since the locking protrusions 24A and 24B) are provided, the spring stopper is appropriately placed at the initial position of the assembling work by temporarily placing the locking portion on the arm piece during the assembling work of the spring. can do. Therefore, the assembling work can be started from an appropriate initial position, and efficient assembling becomes possible.

  Also, if the top of the arm piece base end is a place where the locking portion is temporarily placed, in the assembly work, the spring stopper can be moved by sliding the locking portion on the top. It can be guided naturally to the regular assembly position. Therefore, the assembly work can be facilitated.

  Further, the positioning hole provided in the spring stopper restricts the movement of the guide pin with respect to the spring to a range where the guide pin contacts the inner periphery of the positioning hole, so that the generation of noise due to the contact between the guide pin and the spring is suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
In FIG. 1, the whole structure of the wiper arm 1 in this embodiment is shown. As shown in the drawing, the wiper arm 1 mainly includes an arm piece 2, a retainer 3 that holds the arm piece 2, an arm head 4 to which the retainer 3 is rotatably coupled, and a pivotable movement to the arm head 4. , A spring 6 disposed in a compressed state around the guide pin 5, and a spring stopper 7 interposed between the spring 6 and the arm piece 2.

  The arm piece 2 is a long member made of, for example, metal, and has a U hook portion 11 whose tip is bent into a U shape. A wiper blade (not shown) is attached to the U hook portion 11. The base end of the arm piece 2 is bent into an L-shape and has base end portions 12A and 12B branched into two. A slit portion 13 is formed between the base end portions 12A and 12B. As will be described later, the distal end portion 5B side of the guide pin 5 is disposed in the slit portion 13. Further, as will be described later, the top portions 14A and 14B of the base end portions 12A and 12B serve as mounting portions on which the locking protrusions 24A and 24B of the spring stopper 7 are temporarily mounted.

  As shown in FIG. 1, the retainer 3 is a member composed of an upper surface 3A and side surfaces 3B on both sides (only one side surface is shown in the figure). Under the upper surface 3A of the retainer 3, the base end portions 12A and 12B are disposed so as to overlap each other from near the center of the arm piece 2, and are sandwiched between the side surfaces 3B. In this state, the arm piece 2 is fixed to the upper surface 3 </ b> A of the retainer 3 via the rivet 15.

  Further, the base end side of the side surface 3B of the retainer 3 is rotatably attached to the inner side (right side in the drawing) slightly inside the distal end portion 4A of the arm head 4 via the support pin 16. Although FIG. 1 shows only the vicinity of the distal end portion 4A of the arm head 4, the arm head 4 is a long member connected to the wiper link at a base end portion (not shown).

  As shown in FIG. 3, the guide pin 5 is rotatably supported on the tip end portion 4 </ b> A of the arm head 4 via a support pin 17. The distal end portion 5B side of the guide pin 5 passes through the positioning hole 21 (see FIG. 4) of the spring stopper 7 and is disposed in the slit portion 13 of the arm piece 2. A spring 6 is disposed on the outer periphery of the guide pin 5.

  The guide pin 5 includes a spring receiving portion 5A that is wide on the base end side. A base end portion 6A of the spring 6 is disposed on the spring receiving portion 5A via a washer 18. On the other hand, the distal end portion 6B of the spring 6 is disposed on the outer side surface (the right side surface in the drawing) of the base end portions 12A and 12B of the arm piece 2 via the spring stopper 7. The spring 6 arranged in this way is in a compressed state rather than the natural length.

  The spring 6 acts on the wiper blade so as to generate an appropriate pressing pressure corresponding to the rotation angle of the arm piece 2. More specifically, the position of the pivot fulcrum (support pin 16) of the retainer 3 with respect to the arm head 4 and the pivot fulcrum (support pin 17) of the guide pin 5 with respect to the arm head 4 are shifted. On the other hand, when the retainer 3 is rotated, the compression amount of the spring 6 changes. With such a configuration, the rotation angle of the arm piece 2 (retainer 3) relative to the arm head 4 is such that the arm piece 2 (retainer 3) is substantially parallel to the arm head 4 (an angle when the wiper device is used). ) To the arm head 4 when the arm piece 2 (retainer 3) stands upright (the angle at which the wiper blade is separated from the glass surface when the wiper device is not used). The spring force changes according to the rotation angle of the arm piece 2 and applies an appropriate pressing force to the wiper blade.

  As shown in FIGS. 4 to 7, the spring stopper 7 is a plate-like member having a positioning hole 21 at a substantially central portion. One surface of the spring stopper 7 is a spring mounting surface 7A on which the spring 6 is mounted, and the other surface (back surface) is an arm piece abutting surface 7B that abuts on the base end portion 12 of the arm piece 2. is there.

  On both sides of the positioning hole 21, spring fitting portions 21A and 21B extending toward the spring placement surface 7A are formed. The spring fitting portions 21A and 21B are fitted inside the distal end portion 6B of the spring 6 placed on the spring placement surface 7A. Thereby, the spring stopper 7 is attached to the spring 6 in a correctly positioned state.

  When the spring stopper 7 is attached to the spring 6, the distal end portion 5 </ b> B side of the guide pin 5 is inserted into the positioning hole 21. Thus, even when the retainer 3 is slightly rotated with respect to the arm head 4 during operation of the wiper device, the movement of the guide pin 5 with respect to the spring 6 is a range in which the guide pin 5 contacts the inner periphery of the positioning hole 21. Limited to As a result, the generation of abnormal noise due to the contact between the guide pin 5 and the spring 6 is suppressed.

  Positioning protrusions 22A, 22B, and 23 that extend from the plate surface toward the spring mounting surface 7A are provided on the upper end portion 7C of the spring stopper 7. The positioning protrusions 22A and 22B are arranged on both sides of the spring stopper 7. When the spring stopper 7 is incorporated in the wiper arm 1, the positioning protrusions 22A and 22B are arranged on both sides of the base end portions 12A and 12B of the arm piece 2, respectively. The The positioning protrusion 23 is disposed at substantially the center of the spring stopper 7, and is disposed in the slit portion 13 of the arm piece 2 when the spring stopper 7 is incorporated in the wiper arm 1. These positioning projections 22A, 22B, and 23 restrict the movement of the spring stopper 7 to the left and right with respect to the arm piece 2.

  The upper end portion 7C of the spring stopper 7 is provided with locking projections 24A and 24B extending from the plate surface to the arm piece contact surface 7B side at a substantially right angle. The locking protrusion 24A is disposed between the positioning protrusions 22A and 23, and the locking protrusion 24B is disposed between the positioning protrusions 22B and 23. As will be described in detail below, the locking protrusions 24A and 24B are temporarily placed on the top portions 14A and 14B of the base end portions 12A and 12B of the arm piece 2 when the spring 6 is assembled, respectively. To facilitate the process.

  FIG. 7 shows a state in which the locking protrusions 24A and 24B are temporarily placed on the top portions 14A and 14B during the assembly operation of the spring 6. As shown in the figure, when the spring 6 is assembled, the wiper arm 1 is turned upside down from the state shown in FIGS. Accordingly, the upper end portion 7A of the spring stopper 7 faces downward.

  In the state of FIG. 7, the spring 6 is in a natural length state. For this reason, the spring stopper 7 attached to the front end portion 6B of the spring 6 is shifted to the inside of the arm piece 2 (left direction in the drawing) by the amount that the spring 6 is compressed after the assembly, rather than the state after the assembly. In position. As a result, the locking protrusions 24A and 24B of the spring stopper 7 are just placed on the top portions 14A and 14B of the base end portions 12A and 12B of the arm piece 2, respectively. This state is the initial state of the assembling work.

  From this initial state, the locking projections 24A and 24B are moved so as to slide on the top portions 14A and 14B, and the spring 6 is compressed and the guide pin 5 is rotated in a direction parallel to the retainer 3. Go. Thereby, the spring stopper 7 is correctly disposed at a position where the spring stopper 7 is in contact with the base end portions 12A and 12B of the arm piece 2 from the outside (a position where the spring stopper 7 is contacted from the right side in the drawing), and the assembling work is completed.

  As described above, in the present embodiment, the spring stopper 7 is provided with the locking projections 24A and 24B that are temporarily placed on the top portions 14A and 14B of the arm piece 2, so that during the assembly work of the spring 6, The spring stopper 7 can be easily set to an appropriate initial position. In the subsequent assembling operation, the spring stopper 7 can be naturally guided to the proper assembling position by sliding the locking projections 24A and 24B while sliding on the top portions 14A and 14B. . Therefore, according to this embodiment, the assembly work of the spring 6 can be performed very easily, and the assembly work can be made efficient.

It is sectional drawing which shows the wiper arm in embodiment of this invention. It is a perspective view which shows the front-end | tip part vicinity of an arm piece similarly. It is sectional drawing which similarly shows the guide pin periphery of a wiper arm. It is a front view which similarly shows a spring stopper. It is a side view which similarly shows a spring stopper. It is a top view which similarly shows a spring stopper. Similarly, it is a cross-sectional view showing a state in which the locking protrusion of the spring stopper is temporarily placed on the top of the branch portion of the arm piece during the assembly work of the spring. It is sectional drawing which shows the conventional wiper arm. It is a front view which similarly shows a spring stopper. It is a side view which similarly shows a spring stopper. It is sectional drawing which similarly shows the mode at the time of the assembly | attachment operation | work of a spring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wiper arm 2 Arm piece 3 Retainer 4 Arm head 5 Guide pin 6 Spring 7 Spring stopper 12A, 12B Branch part 14A, 14B Top part 13 Slit part 21 Positioning hole 24A, 24B Locking protrusion

Claims (5)

In the wiper arm provided in the wiper device,
An arm piece connected to the wiper blade;
A retainer to which the arm piece is fixed;
An arm head rotatably connected to the retainer;
A guide pin rotatably supported with respect to the arm head;
A spring disposed in a compressed state around the guide pin;
A spring stopper interposed between the spring and the arm piece;
With
A wiper arm provided with a locking portion on the spring stopper, wherein the locking portion of the spring stopper is temporarily placed on the arm piece when the spring is assembled.   The wiper arm according to claim 1, wherein the locking portion is a protrusion extending from the spring stopper. The spring stopper includes a spring placement surface on which the spring is placed, and an arm piece abutment surface that abuts on the arm piece, and the protrusion extends toward the spring placement surface. The wiper arm according to 2.   The said arm piece is provided with the base end part bent in the L-shape, and the said latching | locking part is mounted in the top part of the base end part of the said arm piece. The wiper arm described.   The wiper arm according to any one of claims 1 to 4, wherein the spring stopper includes a positioning hole into which a tip of the guide pin is inserted.

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