JP6423666B2 - Pantograph wiper device - Google Patents

Description

  The present invention relates to a pantograph-type wiper device having two wiper arms, and more particularly to a mounting structure of a driven arm end called a sub arm among two wiper arms.

  2. Description of the Related Art Conventionally, as a vehicle wiper device mounted on an automobile or the like, a one-arm wiper device having one wiper arm and a two-arm wiper device having two wiper arms are known. The latter two-arm wiper device is also called a pantograph wiper device, and includes a main arm connected to a main shaft and a sub arm connected to a sub shaft arranged near the main shaft. It has become. In this case, the main arm is fastened with the main shaft and the bolt, and the sub arm is press-fitted and fixed to the joint ball portion at the tip of the sub shaft. Since the pantograph wiper device can swing the wiper blade in a large wiping range as compared with a single arm type wiper device, for example, in a vehicle having a relatively large windshield glass such as a bus, Two are arranged so as to oppose left and right. Moreover, it is used also in the form where one windshield glass, such as a light vehicle, is provided in a relatively small vehicle.

  FIG. 4 is an explanatory view showing a configuration of a conventional sub arm attachment portion. As shown in FIG. 4, in the conventional pantograph wiper device, a joint ball portion 51 and a cylindrical portion 52 are formed at the tip portion of the sub shaft 50. On the other hand, on the sub arm 53 side, a cylindrical sub support 54 to which the joint ball portion 51 is fitted and fixed is provided. A fitting portion 55 to which the joint ball portion 51 is attached by snap fitting is formed in the sub support 54, and an engaging claw 56 is formed in the fitting portion 55. The sub arm 53 is attached to the sub shaft 50 in a swingable state by press fitting the joint ball portion 51 into the fitting portion 55.

JP 2010-188832 JP 2010-52538 A Japanese Utility Model Publication No. 63-49416

  However, the fixing by the joint ball is not a structure in which the sub arm 53 is fastened and fixed to the sub shaft 50, so that the movable range of the sub arm 53 is wide, the displacement of the arm tip becomes large, and the arm play and overrun increase. There was a problem. As shown in FIG. 4, in the conventional sub-arm mounting portion, the rotation (swing) of the arm is restricted by the cylindrical portion 52 coming into contact with the inner wall portion 57 of the sub-support 54 (rotation restricting portion 58). . However, since the outer diameter of the cylindrical portion 52 is small, stress concentrates on the abutting portion, and bending tends to occur. In fact, the rotation range is larger than expected and is not very effective. Further, in the structure of FIG. 4, the rotation restricting portion 58 and the engaging claw 56 of the fitting portion 55 exist at positions opposite to the center of the joint ball portion 51. For this reason, the reaction force when the cylindrical part 52 and the inner wall part 57 interfere with each other is applied to the fitting part 55 by the rotation restricting part 58. Then, the engaging claw 56 engaged with the joint ball portion 51 is bent by this reaction force, which also contributes to a decrease in the rotation restricting action.

  An object of the present invention is to improve the rotation restriction between the sub-support and the sub-shaft, suppress the movable range of the sub-arm, and thereby reduce arm backlash and overrun.

A pantograph-type wiper device according to the present invention includes a main shaft driven by an electric motor, a main arm having one end fixed to the main shaft, a sub shaft disposed in the vicinity of the main shaft, and one end on the sub shaft. In a pantograph wiper device comprising: a sub-arm that is fixed on the side and that operates following the main arm; and a wiper blade that is rotatably attached to the other end of the main arm and the sub-arm. A sub-support that is press-fitted and fixed to the sub-shaft, the sub-shaft being inserted into the sub-support and a joint ball portion press-fitted into a fitting portion formed in the sub-support When the sub arm rotates with respect to the sub shaft, it contacts the inner wall of the sub support. To a contact portion, wherein the engaging portion has engaging claws which inner surface is formed into a spherical shape to mate with the joint ball portion, the engagement pawl and the contact portion, the are arranged on the same side in the axial direction with respect to the joint ball portion, said such abutment and by contact with the inner wall of the sub-support, the rotation restricting portion for restricting the rotation of the sub-arm is formed Rukoto It is characterized by.

In the pantograph wiper device, the contact portion may project from the sub shaft in a radial direction .

  In the present invention, by forming the rotation restricting portion by the abutting portion and the inner wall of the sub support, the movable range of the sub arm can be narrowed, and the displacement and backlash of the arm can be suppressed small. In addition, by projecting the contact portion from the sub shaft in the radial direction and increasing the outer diameter of the rotation restricting portion, the stress generated in the sub support when the sub shaft and the sub support interfere with each other is dispersed. Sub-support bending is suppressed, and arm displacement and backlash are reduced. Furthermore, by arranging the rotation restricting portion and the engaging claw on the same side in the axial direction with respect to the joint ball portion, the engaging claw becomes difficult to bend, and a decrease in the rotation restricting action is suppressed.

  According to the pantograph-type wiper device of the present invention, the pantograph-type wiper device includes a main arm having one end fixed to the main shaft and a sub-arm having one end fixed to the sub-shaft. Since the rotation restriction part that restricts the rotation of the sub arm is formed by the inner wall of the sub support that is press-fitted and fixed to the sub shaft and the contact part provided on the sub shaft, the movement of the sub arm can be made as compared with the conventional sub arm mounting structure. The range can be narrowed, the displacement and backlash of the arm can be kept small, and overrun can be suppressed.

It is explanatory drawing which shows the whole structure of the wiper apparatus which is one embodiment of this invention. It is explanatory drawing which shows the whole structure of the wiper apparatus which is one embodiment of this invention. It is explanatory drawing which shows the structure of the sub arm attachment part in the wiper apparatus of FIG. It is explanatory drawing which shows the structure of the conventional sub arm attachment part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are explanatory views showing the overall configuration of a wiper device according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the wiper device 1 has a pantograph configuration including a main arm 2 and a sub arm 3. An arm support 4 is attached to the front ends of the main arm 2 and the sub arm 3, and a wiper blade 5 is attached to the hook portion 4 a of the arm support 4. The wiper blade 5 is disposed on a windshield glass (not shown) of the vehicle, and wipes raindrops while swinging on the glass surface.

  The wiper device 1 is driven by a wiper motor (electric motor) 6. The rotation of the wiper motor 6 is transmitted to the main arm 2 and the sub arm 3 via the link mechanism 7, and the wiper blade 5 performs a swinging motion. The link mechanism 7 is disposed between the output shaft 8 of the wiper motor 6 and a pivot holder 9 to which the main arm 2 and the sub arm 3 are attached. The link mechanism 7 includes a crank arm 11, a drive rod 12 and a drive lever 13. Yes. One end side of the crank arm 11 is fixed to the output shaft 8 of the wiper motor 6. The other end side of the crank arm 11 is rotatably attached to one end side of the drive rod 12 via a ball joint 14. The other end of the drive rod 12 is rotatably attached to one end of the drive lever 13 via a ball joint 15. A main shaft 16 to which the main arm 2 is attached is erected on the other end side of the drive lever 13. A pivot holder 9 made of aluminum die cast is attached to the main shaft 16.

  The main arm 2 is attached to the upper end of the main shaft 16. The main arm 2 includes a main arm head 17 fixed to the main shaft 16, a main arm retainer 18, and a main arm piece 19. The main arm retainer 18 is connected to the tip of the main arm head 17. The main arm piece 19 is a metal rod-like member, the base end portion is held by the main arm retainer 18, and the tip end portion is attached to the arm support 4.

  The pivot holder 9 includes a holder cylinder portion 21 formed in a substantially cylindrical shape, and the main shaft 16 is rotatably held in the holder cylinder portion 21. The holder tube portion 21 is integrally provided with a frame fixing portion 22 so as to protrude outward in the radial direction. One end side of a frame member 23 made of a hollow pipe is caulked and fixed to the frame fixing portion 22. The frame member 23 is fixed to the gear case 24 of the wiper motor 6, and the other end is a vehicle body fixing portion 25, and is fixed to the vehicle body side via a rubber bush 26. Further, a fixing leg portion 27 is provided on the opposite side of the holder tube portion 21 from the frame fixing portion 22 so as to protrude radially outward. The fixed leg 27 is fixed to the vehicle body via a rubber bush 28.

  Further, a sub-shaft holder 29 protrudes radially outward from the holder tube portion 21. The sub shaft holder 29 is provided with a sub shaft 31 to which the sub arm 3 is attached. The sub arm 3 includes a sub arm head 32 fixed to the sub shaft 31, a sub arm retainer 33, and a sub arm piece 34. The sub arm retainer 33 is connected to the tip of the sub arm head 32. The sub arm piece 34 is a metal rod-like member, the base end portion is held by the sub arm retainer 33, and the tip end portion is attached to the arm support 4.

  FIG. 3 is an explanatory view showing a configuration of a portion (sub arm attachment portion) for attaching the sub arm 3 to the sub shaft 31. As shown in FIG. 3, the sub-shaft 31 is provided with a spherical joint ball portion 35 and a columnar portion 36 formed on the distal end side of the joint ball portion 35. A disc-shaped flange portion (contact portion) 37 extending in the radial direction is provided below the joint ball portion 35. The joint ball part 35 and the flange part 37 are formed to have a larger diameter than the cylindrical part 36 (for example, the cylindrical part 36: φ8 mm, the joint ball part 35: φ10 mm, the flange part 37: φ14 mm), A sub support 38 having a substantially cylindrical shape is provided on the sub arm head 32 side of the sub arm 3, and the sub arm 3 is attached to the sub shaft holder 29 by being inserted into the sub shaft 31 into the sub support 38.

  The sub support 38 includes a cylindrical cover portion 39 formed with a larger diameter than the sub shaft holder 29, and a shaft insertion portion 41 formed at the back of the cover portion 39. The shaft insertion portion 41 is provided with a circular hole portion 42 formed in the inner portion and into which the columnar portion 36 is inserted, and a fitting portion 43 into which the joint ball portion 35 is fitted and fixed. The fitting portion 43 is formed with an engaging claw 44 extending downward. The inner peripheral walls of the fitting part 43 and the engaging claw 44 are spherical and are flush with each other.

  In the sub arm attachment portion, the sub arm 3 is attached onto the sub shaft 31 by press-fitting the tip end portion of the sub shaft 31 into the shaft insertion portion 41. At that time, the joint ball portion 35 is attached to the fitting portion 43 by snap fitting, and the fitting portion 43 and the engaging claw 44 are closely fitted to the joint ball portion 35 in a swingable state. Further, the flange portion 37 is inserted into the cover portion 39 with a slight clearance C (for example, 1 mm or less).

  As described above, in the conventional sub-arm mounting structure, the rotation of the arm is restricted by the cylindrical portion at the tip of the shaft coming into contact with the inner wall portion of the sub support. For this reason, there is a problem that the sub-support is easily bent, the displacement of the arm tip is large, and the arm play and overrun increase. On the other hand, in the sub-arm mounting structure according to the present invention, the rotation of the arm is not the contact between the cylindrical portion 36 and the circular hole portion 42 but the rotation restriction constituted by the flange portion 37 and the inner wall 45 of the cover portion 39. Regulated by the portion 46. That is, when the sub arm 3 rotates with respect to the sub shaft 31, the flange portion 37 comes into contact with the cover portion inner wall 45, and the rotation is prevented there.

  In the rotation restricting portion 46, the flange portion 37 is inserted into the cover portion 39 with a slight clearance. For this reason, the movable range of the sub arm 3 is narrow, the displacement and backlash of the arm are suppressed to be small, and the overrun is also suppressed. For example, when a clearance C of 1 mm is provided on the outer periphery of the φ37 mm flange portion 37, if the distance between the center of the joint ball portion 35 and the upper end of the flange portion 37 is 6 mm, the inclination of the sub arm 3 is less than 4 ° (3. About 8 °). Further, since the outer diameter of the rotation restricting portion 46 is larger than that of the conventional structure (the outer diameter of the flange portion 37: the outer diameter of the cylindrical portion 52), the sub support 38 when the sub shaft 31 and the sub support 38 interfere with each other. The stress generated in is dispersed. Therefore, the bending of the sub support 38 is suppressed, and the displacement and backlash of the arm are also suppressed to a small level. Further, unlike the conventional structure, since the rotation restricting portion 46 and the engaging claw 44 are on the same side in the axial direction with respect to the center of the joint ball portion 35, the engaging claw 44 is difficult to bend and the rotation restricting action is reduced. It can be suppressed.

  In addition, since the flange portion 37 is provided on the sub-shaft 31, when the sub-shaft 31 is inserted into the large-diameter shaft insertion portion 41, the flange portion 37 serves as a guide, and the insertion workability of the sub-shaft 31 is improved. Is done. Further, since the flange portion 37 is inserted into the cover portion 39 with a slight clearance, the clearance between the sub-shaft outer diameter and the sub-support inner diameter is smaller than that in the conventional structure, and water can enter the joint portion. It is suppressed and the wet performance is improved. Further, in the rotation restricting portion 46, since the flange portion 37 is integrally formed with the sub shaft 31, the movable range of the sub arm 3 can be reduced without increasing the number of parts.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.
For example, in the above-described embodiment, the configuration in which the disk-like flange portion 37 is provided as the contact portion of the rotation restricting portion 46 is shown, but the shape of the contact portion is a convex portion protruding in the radial direction. If it is, it is not limited to the flange shape, but may be a block-like protrusion, a pin, a screw, a washer or the like.

  Further, in the above-described embodiment, the example in which the present invention is applied to the wiper device 1 for wiping the windshield glass on the front side of the vehicle is shown, but the present invention is not limited thereto, and the rear window glass provided on the vehicle rear side, The present invention can also be applied to a wiper device for wiping a windshield of a railway vehicle or an aircraft.

DESCRIPTION OF SYMBOLS 1 Wiper apparatus 2 Main arm 3 Sub arm 4 Arm support 4a Hook part 5 Wiper blade 6 Wiper motor 7 Link mechanism 8 Output shaft 9 Pivot holder 11 Crank arm 12 Drive rod 13 Drive lever 14 Ball joint 15 Ball joint 16 Main shaft 17 Main arm head 18 Main arm retainer 19 Main arm piece 21 Holder tube portion 22 Frame fixing portion 23 Frame member 24 Gear case 25 Car body fixing portion 26 Rubber bush 27 Fixed leg portion 28 Rubber bush 29 Sub shaft holder 31 Sub shaft 32 Sub arm head 33 Sub arm retainer 34 Sub arm piece 35 Joint ball part 36 Column part 37 Flange part (contact part)
38 Sub support 39 Cover part 41 Shaft insertion part 42 Circular hole part 43 Fitting part 44 Engaging claw 45 Inner wall 46 Rotation restricting part 50 Sub shaft 51 Joint ball part 52 Column part 53 Sub arm 54 Sub support 55 Fitting part 56 Joint pawl 57 Inner wall 58 Rotation restricting part C Clearance

Claims (2)

A main shaft driven by an electric motor;
A main arm having one end fixed to the main shaft;
A sub-shaft disposed in the vicinity of the main shaft;
A sub arm whose one end is fixed to the sub shaft and is operated by following the main arm;
In a pantograph wiper device comprising a wiper blade rotatably attached to the other end side of the main arm and the sub arm,
The sub arm has a sub support that is press-fitted and fixed to the sub shaft.
The sub-shaft includes a joint ball portion press-fitted into a fitting portion formed in the sub-support, and an inner wall of the sub-support when the sub-arm rotates with respect to the sub-shaft inserted into the sub-support. An abutting portion that comes into contact with
The fitting portion has an engaging claw that has an inner surface formed in a spherical shape and is fitted to the joint ball portion,
The engaging claw and the contact portion are arranged on the same side in the axial direction with respect to the joint ball portion,
Wherein the contact between the abutting inner wall of the sub-support, the pantograph wiper device according to claim Rukoto such by the rotation restricting portion is formed for restricting the rotation of the sub-arm. The pantograph wiper device according to claim 1,
The pantograph-type wiper device, wherein the abutting portion is provided so as to protrude in a radial direction from the sub shaft.

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