JP2010143385A - Wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper arm attaching structure having high working efficiency and stabilizing slipping torque. <P>SOLUTION: An insertion hole 17a, into which an output shaft 14 is inserted, is formed in an arm support 17 of the wiper arm 15. A straight section 26 including a plurality of projections formed along the axial direction of the output shaft 14, and an engagement groove 28 indented toward the inside in the radial direction are disposed on the outer peripheral surface of the output shaft 14. A serration section 36 including a plurality of projections formed along the axial direction of the output shaft 14, and an engagement projection 39 protruding toward the inside in the radial direction are disposed on the inner peripheral surface of the insertion hole 17a. The wiper arm 15 is fixed to the output shaft 14 by the fit between the straight section 26 and the serration section 36, and the engagement between the engagement groove 28 and the engagement projection 39. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wiper device that is driven to swing by a drive source and wipes off deposits attached to a windshield.

  2. Description of the Related Art Conventionally, a wiper device is provided in a vehicle such as an automobile, and the wiper device is operated so as to wipe out deposits such as rain and snow adhering to a windshield and splashes of a front vehicle to ensure visibility. The wiper device is used not only for the front side of the vehicle but also for securing the field of view of the rear side of the vehicle, and the rear wiper device is a hatchback that is easy to entrain deposits on the rear side of the vehicle, particularly when the vehicle is running. Many are installed in cars and wagons.

  Such a wiper device has a wiper arm that is oscillated and driven by an electric motor (drive source), and a wiper blade that is provided at the front end in the longitudinal direction of the wiper arm and wipes the windshield. The wiper arm is fixed to the output shaft that transmits the rotation of the electric motor at the base end in the longitudinal direction. For example, Patent Document 1 discloses an attachment structure for fixing the wiper arm to the output shaft. The described technique is known.

In the wiper device described in Patent Document 1, an insertion hole into which the output shaft is inserted is formed at the longitudinal base end portion of the wiper arm, and the male screw is formed at the axial distal end portion of the output shaft protruding from the insertion hole The wiper arm is fixed to the output shaft by tightening the nut to the portion. The outer peripheral surface of the output shaft is provided with a taper fitting portion that is inclined so that its diameter decreases toward the tip end in the axial direction of the output shaft. The inner peripheral surface of the insertion hole of the wiper arm has a taper fitting. A taper receiving portion (pivot receiving portion) facing the joint portion is formed, and by tightening a nut to the male screw portion, a plurality of protrusions (projections) provided in the taper fitting portion bite into the taper receiving portion, The taper fitting portion and the taper receiving portion are fitted.
JP-A-9-207722

  However, when fixing the wiper arm to the output shaft in the wiper device described in Patent Document 1, since the operator tightens the nut, the amount of tightening of the nut, the mounting angle of the wiper arm, etc. are left to the operator to some extent. In addition, there is a possibility that variations occur in the slipping torque between the wiper arm and the output shaft and the mounting angle of the wiper arm. For this reason, for example, when the tightening amount of the nut is small and the sliding torque is smaller than the required value, the taper fitting portion and the taper receiving portion are licked, that is, sliding between the taper fitting portion and the taper receiving portion. Occurs, and the wiper device becomes inoperative. On the other hand, when the tightening amount of the nut is large and the sliding torque is larger than the required value, the sliding between the taper fitting part and the taper receiving part when the wiper arm swinging drive is hindered by foreign matters such as snow. The wiper device and the electric motor may be damaged.

  In addition, since the protrusion provided on the taper fitting portion of the output shaft bites into the taper receiving surface of the insertion hole so that the taper fitting portion and the taper receiving surface are fitted, once the taper fitting portion If the taper receiving surface is licked, it is difficult to fit the taper fitting portion and the taper receiving surface again, and it is difficult to reattach the wiper device.

  An object of the present invention is to provide a wiper arm mounting structure with good workability and stable sliding torque.

  Another object of the present invention is to provide a reattachable wiper arm mounting structure.

  The wiper device of the present invention includes an output shaft that is rotationally driven by a drive source, and an insertion hole into which the output shaft is inserted at a longitudinal base end portion, and is a wiper arm that is fixed to the output shaft and is driven to swing. And a wiper device attached to the front end of the wiper arm in the longitudinal direction and wiping the wiping surface, provided on the outer peripheral surface of the output shaft and formed along the axial direction of the output shaft A fitting portion provided with a plurality of protrusions, and a fitting provided on the inner peripheral surface of the insertion hole and provided with a plurality of protrusions formed along the axial direction of the output shaft to be fitted with the fitting portion. A mating portion, an engagement protrusion that is provided on one of the outer peripheral surface of the output shaft and the inner peripheral surface of the insertion hole and projects in the radial direction of the output shaft toward the other, and the output shaft Provided on the other of the outer peripheral surface of the insertion hole and the inner peripheral surface of the insertion hole Is characterized by having a engagement groove for notched to engage with the engaging protrusion in the radial direction of the output shaft.

  In the wiper device of the present invention, the wiper arm includes a snap fit portion that extends toward the axial base end side of the output shaft along the outer peripheral surface of the output shaft and is divided into a plurality of portions in the circumferential direction. The engagement protrusion or the engagement groove is provided on the inner peripheral surface of the snap fit portion that forms the hole.

  In the wiper device according to the present invention, the wiper arm includes an arm support fixed to the output shaft, and an arm shank attached to the arm support at a longitudinal base end and the wiper blade attached to the longitudinal tip. And the snap-fit portion is formed integrally with the arm support.

  In the wiper device according to the present invention, the wiper arm includes an arm support fixed to the output shaft, and an arm shank attached to the arm support at a longitudinal base end and the wiper blade attached to the longitudinal tip. The arm support includes another member in which the snap fit portion is formed.

  The wiper device of the present invention is provided on the outer peripheral surface of the output shaft, and is inclined so that the diameter becomes smaller toward the distal end side in the axial direction of the output shaft, and a plurality of the wiper devices formed along the inclined direction. A taper fitting portion provided with a protrusion and provided on the inner peripheral surface of the insertion hole, opposed to the taper fitting portion, and inclined so that the diameter decreases toward the tip end side in the axial direction of the output shaft. A taper receiving surface, and a male screw portion formed at an axial tip portion of the output shaft protruding from the insertion hole, and a nut is tightened on the male screw portion, whereby the protrusion of the taper fitting portion is The taper receiving surface is bitten and the taper fitting portion and the taper receiving surface are fitted.

  The wiper device according to the present invention is characterized in that the taper fitting portion is continuously formed on the proximal end side in the axial direction of the fitting portion.

  According to the present invention, the fitting portion of the output shaft including the plurality of protrusions formed along the axial direction of the output shaft and the fitted portion of the wiper arm are fitted, and the engaging groove and the engaging protrusion are Since the wiper arm is fixed to the output shaft so as to be able to transmit the rotation, the slip torque between the wiper arm and the output shaft is set by fitting the fitting portion and the fitting portion. The Rukoto. As a result, it is possible to prevent the slip torque from being varied by the operator when the wiper arm is attached, and a stable slip torque can be set. In addition, since each protrusion formed on the fitting portion and the fitted portion is formed along the axial direction of the output shaft, the wiper arm is not attached in a state of being inclined with respect to the output shaft, and the wiper arm It is possible to prevent the oblique assembly from occurring. Furthermore, since each fitting projection and each fitting fitting are fitted so as to be fitted, it is easy to set the wiper arm mounting angle, and the operator can vary the mounting angle of the wiper arm. Is suppressed from occurring.

  According to the present invention, the wiper arm is provided with the snap fit portion that extends in the axial base end side along the outer peripheral surface of the output shaft and is divided into a plurality of portions in the circumferential direction, and the engagement protrusion is formed on the inner peripheral surface of the snap fit portion. Alternatively, since the engagement groove is formed, the snap fit portion is pushed and widened when the output shaft is inserted into the insertion hole, and the engagement protrusion and the engagement groove can be easily engaged. .

  According to the present invention, even when slippage occurs between the fitting portion and the fitted portion and these cannot be fitted, the nut is fastened to the male screw portion of the output shaft, and each projection of the tapered fitting portion The wiper arm can be reattached to the output shaft by biting the taper receiving surface and fitting the taper fitting portion and the taper receiving surface.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a rear view of a vehicle equipped with a wiper device according to the present invention, and FIG. 2 is an enlarged perspective view of the wiper device.

  As shown in FIG. 1, a back door 11 as an opening / closing body is provided on the rear side of the vehicle 10. The back door 11 is supported in a cantilevered manner by a hinge shaft (not shown) provided on the roof portion 10a of the vehicle 10, and opens and closes in the vertical direction around the hinge shaft. That is, the back door 11 employs a so-called upper hinge lower opening type structure.

  The back door 11 is provided with an opening 11 a into which a rear glass 12 as a windshield is fitted. The back door 11 forms a frame that supports the rear glass 12. A wiper motor (electric motor) (not shown) serving as a drive source is mounted inside the back door 11 and located on the vehicle lower side with respect to the opening 11a. The wiper motor is rotationally driven by operating an operation switch provided in the passenger compartment or the like. A wiper device 13 that is driven to swing by the wiper motor is provided outside the back door 11. .

  As shown in FIG. 2, the wiper device 13 is attached to an output shaft 14 that transmits the rotation of the wiper motor, a wiper arm 15 that is fixed to the output shaft 14 at the longitudinal base end, and a longitudinal tip of the wiper arm 15. And a wiper blade 16 for wiping the glass surface (wind shield surface) of the rear glass 12 as a wiping surface.

  The output shaft 14 is housed inside the back door 11 and connected to the wiper motor at the base end side in the axial direction, and the rotation of the wiper motor is transmitted to rotate within a predetermined angular range. The distal end side of the output shaft 14 in the axial direction protrudes outside the back door 11, and the longitudinal base end portion of the wiper arm 15 is fixed.

  An arm support 17 fixed to the output shaft 14 is provided at the longitudinal base end portion (left end portion in FIG. 2) of the wiper arm 15. The arm support 17 is covered with a cover member 18 made of a resin such as plastic, so that the arm support 17 and the output shaft 14 are prevented from being exposed to the outside, and the appearance of the wiper device 13 is improved.

  The arm support 17 is connected to the base end portion in the longitudinal direction of the arm shank 19 constituting the wiper arm 15, and the arm shank 19 approaches and separates from the glass surface of the rear glass 12 around the connecting portion with the arm support 17. It is freely rotatable in the direction. The arm shank 19 is formed in an arm shape having a substantially U-shaped cross section by a resin material such as plastic, and a tension spring (not shown) for connecting the arm support 17 and the arm shank 19 is accommodated therein. The tension spring biases the spring force against the arm shank 19 so as to press the wiper blade 16 attached to the distal end side in the longitudinal direction of the arm shank 19 toward the glass surface of the rear glass 12, and thereby the wiper blade 16 is pressed against the glass surface of the rear glass 12 with a predetermined pressing force, so that the glass surface of the rear glass 12 can be wiped without being left behind.

  The wiper blade 16 includes a primary lever 20 formed in a predetermined shape from a resin material such as plastic. The primary lever 20 is attached to the front end portion of the arm shank 19 by pin coupling at a substantially central portion in the longitudinal direction.

  A pair of secondary levers 21 are provided at both ends in the longitudinal direction of the primary lever 20. The secondary lever 21 is attached to both ends in the longitudinal direction of the primary lever 20 by pin coupling at a substantially central portion in the longitudinal direction. Each secondary lever 21 is provided with a plurality of holding claws 21 a for holding the blade rubber 22 constituting the wiper blade 16. Each holding claw 21 a is disposed so as to face the both ends in the longitudinal direction of each secondary lever 21.

  The blade rubber 22 is formed of a flexible rubber material. The blade rubber 22 is in sliding contact with the glass surface of the rear glass 12 and can be bent along the glass surface. The blade rubber 22 is configured to slide on the glass surface of the rear glass 12 and wipe off deposits such as rainwater adhering to the glass surface when the wiper device 13 is driven to swing by the rotation of the wiper motor.

  Next, a mounting structure for fixing the arm support 17 (wiper arm 15) to the output shaft 14 will be described. 3 is a partially enlarged perspective view of the wiper device with the cover member removed, FIG. 4 is an exploded perspective view of the wiper device shown in FIG. 3, and FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a sectional view taken along the line BB in FIG.

  As shown in FIG. 5, the arm support 17 is formed with an insertion hole 17a penetrating in the axial direction of the output shaft 14, and the arm support 17 is in a state where the axial end of the output shaft 14 is inserted into the insertion hole 17a. Is fixed to the output shaft 14.

  Located on the distal end side in the axial direction of the insertion hole 17a (upper side in FIG. 5), the outer peripheral surface of the output shaft 14 is provided with serration portions (knurling portions) 25 that are uneven in the circumferential direction at equal intervals. . The serration portion 25 has a straight portion 26 as a fitting portion having a plurality of protrusions (uneven shape) formed along the axial direction of the output shaft 14, and the diameter decreases toward the distal end side in the axial direction of the output shaft 14. And a taper portion 27 as a taper fitting portion provided with a plurality of protrusions (uneven shape) formed along the inclination direction.

  The straight portion 26 is provided at the distal end in the axial direction of the insertion hole 17a. Each protrusion of the straight portion 26 has a substantially triangular cross section that protrudes radially in the radial direction of the output shaft 14, and each protrusion extends parallel to the axial direction of the output shaft 14. On the other hand, the taper portion 27 is located at a substantially central portion in the axial direction of the insertion hole 17 a and is provided from the axial base end portion of the straight portion 26 toward the axial base end side of the output shaft 14. Is continuously formed on the axial base end side of the straight portion 26. Each protrusion of the tapered portion 27 has a substantially triangular cross section that protrudes radially in a direction perpendicular to the inclination direction of the tapered portion 27, and each protrusion extends parallel to the inclination direction of the tapered portion 27.

  An annular engaging groove 28 having a rectangular cross section is provided on the outer peripheral surface of the output shaft 14 at the proximal end in the axial direction of the insertion hole 17a. The engagement groove 28 is provided at a predetermined distance from the tapered portion 27 toward the proximal end side in the axial direction. It is cut out toward the inside in the direction.

  An axial tip of the output shaft 14, that is, an end on the axial tip side of the straight portion 26 protrudes from the insertion hole 17a. A male screw is threaded on the outer peripheral surface of the protruding portion of the output shaft 14, and the male screw A portion 29 is provided.

  The arm support 17 is provided with a recess 31 that is cut out toward the proximal end side in the axial direction of the output shaft 14 around the male screw portion 29 of the output shaft 14. The concave portion 31 has a substantially circular cross section centered on the axis of the output shaft 14, and the male screw portion 29 protrudes into the space formed between the arm support 17 and the cover member 18 by the concave portion 31. A nut 40 to be described later can be fastened to 29.

  The arm support 17 is provided with a recess 32 that is cut out toward the distal end side in the axial direction of the output shaft 14 around the proximal end side in the axial direction of the insertion hole 17a. The recess 32 has a substantially circular cross section centered on the axis of the output shaft 14. The recess 32 extends in the axial direction from the vicinity of the axial base end portion of the insertion hole 17a (position where the engagement groove 28 is formed) to the periphery of the central portion of the insertion hole 17a (position where the taper portion 27 is formed). Open to the side.

  A mounting hole 33 is formed in the arm support 17 to communicate the recesses 31 and 32 in the axial direction. The mounting hole 33 is a stepped round hole formed coaxially with the insertion hole 17a, and has a large-diameter hole portion 33a on the axially distal end side and a small-diameter hole portion 33b on the axially proximal end side. Yes. The mounting hole 33 communicates with the concave portion 31 on the distal end side in the axial direction of the large diameter hole portion 33a, and communicates with the concave portion 32 on the proximal end side in the axial direction of the small diameter hole portion 33b.

  As shown in FIG. 4, the arm support 17 includes a fixing member 35 that is mounted in the mounting hole 33. The fixing member 35 has a stepped cylindrical shape that can be fitted into the mounting hole 33, and has a large-diameter portion 35 a on the distal end side in the axial direction attached to the large-diameter hole portion 33 a of the mounting hole 33, and And a small-diameter portion 35b on the proximal side in the axial direction attached to the small-diameter hole portion 33b. An insertion hole 17 a is formed in the shaft center of the fixing member 35, and the arm support 17 is fixed to the output shaft 14 via the fixing member 35.

  Corresponding to the straight portion 26 of the output shaft 14, a serration portion (knurling portion) 36 as a fitted portion having an uneven shape at equal intervals in the circumferential direction is formed on the inner peripheral surface (inlet) of the insertion hole 17 a. Is provided. The serration portion 36 is provided around the straight portion 26 of the output shaft 14, that is, at the distal end portion in the axial direction of the insertion hole 17a, and is provided on the inner peripheral surface of the large diameter portion 35a that forms the insertion hole 17a. The serration portion 36 includes a plurality of protrusions (uneven shape) formed along the axial direction of the output shaft 14. Each protrusion of the serration portion 36 has a substantially triangular cross section that protrudes radially inward of the output shaft 14, extends parallel to the axial direction of the output shaft 14, and engages with each protrusion of the straight portion 26. It is made possible. By fitting the serration portion 36 of the insertion hole 17a with the straight portion 26 of the output shaft 14, the arm support 17 (wiper arm 15) is mounted on the output shaft 14 so as to be able to transmit rotation.

  Corresponding to the tapered portion 27 of the output shaft 14, a tapered receiving surface 37 is provided on the inner peripheral surface of the insertion hole 17 a so as to be inclined so that the diameter decreases toward the distal end side in the axial direction of the output shaft 14. Yes. The taper receiving surface 37 is provided on the inner peripheral surface of the small-diameter portion 35b that forms the insertion hole 17a, which is located around the taper portion 27 of the output shaft 14, that is, adjacent to the axial base end side of the serration portion 36. ing. The taper receiving surface 37 is set to an inclination angle substantially the same as the inclination angle of the taper portion 27, and the output shaft 14 is arranged in a state where the taper portion 27 faces the taper receiving surface 37.

  The fixing member 35 has a substantially cylindrical snap-fit portion 38 that extends from the end surface on the axial base end side of the small diameter portion 35b to the axial base end side of the output shaft 14. The snap fit portion 38 extends to the position where the engagement portion 28 is formed along the outer peripheral surface of the output shaft 14, and the axial base end side of the insertion hole 17 a is formed by the inner peripheral surface of the snap fit portion 38. As shown in FIG. 6, the snap fit portion 38 is divided into a plurality of portions (six divisions in the present embodiment) in the circumferential direction, and the snap fit portion 38 is radially outward with the connecting portion with the small diameter portion 35b as a center. It is free to bend.

  An engagement protrusion 39 that protrudes radially inward from the inner peripheral surface of the snap fit portion 38, that is, the inner peripheral surface of the insertion hole 17 a toward the outer peripheral surface of the output shaft 14, is provided at the axial base end portion of the snap fit portion 38. Is provided. The engagement protrusion 39 has a shape that can be engaged with the engagement groove 28 of the output shaft 14. When the engagement protrusion 39 and the engagement groove 28 are engaged, the engagement protrusion 39 is separated from the output shaft 14 of the arm support 17. The arm support 17 (wiper arm 15) is fixed to the output shaft 14. An inclined surface 39 a that is inclined so that the engaging protrusion 39 can be easily inserted into the output shaft 14 is formed on the end face on the proximal end side in the axial direction of the engaging protrusion 39.

  As shown in FIG. 5, in the state where the distal end side in the axial direction of the output shaft 14 is inserted into the insertion hole 17 a of the arm support 17 (fixing member 35) and the arm support 17 (wiper arm 15) is fixed to the output shaft 14. The straight portion 26 of the output shaft 14 and the serration portion 36 of the insertion hole 17a are fitted, and the rotation of the output shaft 14 is transmitted to the wiper arm 15. In the arm support 17, the taper receiving surface 37 of the insertion hole 17 a abuts the taper portion 27 of the output shaft 14, and the engagement protrusion 39 of the snap fit portion 38 engages with the engagement groove 28 of the output shaft 14. It is fixed to the output shaft 14 without play.

  Next, an attachment method for fixing the wiper arm 15 to the output shaft 14 will be described. FIGS. 7A to 7C are explanatory views for explaining a method of attaching the wiper arm.

  First, as shown in FIG. 7A, the wiper arm 15 is directed toward the distal end side in the axial direction of the output shaft 14 so that the axial direction of the insertion hole 17a of the arm support 17 coincides with the axial direction of the output shaft 14. The output shaft 14 is inserted into the insertion hole 17a.

  As shown in FIG. 7B, the diameter of the straight portion 26 of the output shaft 14 is formed to be larger than the inner diameter of the engaging projection 39, and the straight portion 26 is inserted in the process of inserting the output shaft 14 into the insertion hole 17a. The tip end in the axial direction is brought into contact with the inclined surface 39a of the engaging protrusion 39. When the output shaft 14 is further inserted into the insertion hole 17a from this state, an urging force is applied to the snap fit portion 38 from the output shaft 14 to the radially outer side via the inclined surface 39a. The snap fit portion 38 is pushed out by being curved outward. As a result, as shown in FIG. 7C, the output shaft 14 can be inserted into the insertion hole 17a in a state where the engaging protrusion 39 is in sliding contact with the outer peripheral surface of the output shaft 14. At this time, the wiper arm 15 is inserted in a state where the assembly position of the serration portion 36 of the engagement groove 17a and the straight portion 26 of the output shaft 14 is adjusted so that the wiper arm 15 is attached to the output shaft 14 at a predetermined attachment angle. The output shaft 14 is inserted into the hole 17a, and the serration portion 36 and the straight portion 26 are fitted.

  When the engagement protrusion 39 reaches the position where the engagement groove 28 is formed, the engagement protrusion 39 protrudes into the engagement groove 28 and the snap fit portion 38 is released from the curved state. As shown in FIG. The taper receiving surface 37 of 17a abuts on the taper portion 27 of the output shaft 14, and the engaging protrusion 39 engages with the engaging groove 28, so that the wiper arm 15 is fixed to the output shaft 14 without play. In addition, since the inclined surface is not formed on the end surface on the front end side in the axial direction of the engagement protrusion 39, even if an external force is applied to the wiper arm 15 in the direction of coming off from the output shaft 14 (the front end side in the axial direction) The wiper arm 15 does not come out of the output shaft 14 due to the expansion of 38.

  As described above, the straight portion 26 of the output shaft 14 having a plurality of protrusions formed along the axial direction of the output shaft 14 and the serration portion 36 of the wiper arm 15 are fitted, and the engaging groove 28 of the output shaft 14 is fitted. Since the wiper arm 15 is fixed to the output shaft 14 so as to be able to rotate and transmit by engaging the engaging projection 39 of the insertion hole 17a with the sliding torque between the wiper arm 15 and the output shaft 14 is straight. It is set by fitting the part 26 and the serration part 36. Thereby, when the wiper arm 15 is attached, it is possible to prevent the slip torque from being varied by an operator, and a stable slip torque can be set. That is, unlike the conventional mounting structure, the slip torque does not vary depending on the amount of tightening of the nut by the operator, and the wiper device 13 can be prevented from becoming inoperative or damaged. In addition, the shape and number of each protrusion formed in the straight part 26 and the serration part 36 can be arbitrarily set according to a desired sliding torque or the like.

  Moreover, since each protrusion formed in the straight part 26 and the serration part 36 is formed along the axial direction of the output shaft 14, the wiper arm 15 is not attached in a state inclined with respect to the output shaft 14, It is possible to prevent the oblique assembly of the wiper arm 15 from occurring. Further, since the projections of the straight portion 26 and the projections of the serration portion 36 are fitted to each other, it is easy to set the mounting angle of the wiper arm 15, and the mounting angle of the wiper arm 15 can be set by the operator. The occurrence of variations is suppressed.

  Further, the wiper arm 15 is provided with a snap fit portion 38 that extends toward the proximal end side in the axial direction along the outer peripheral surface of the output shaft 14 and is divided into a plurality of portions in the circumferential direction, and is engaged with the inner peripheral surface of the snap fit portion 38. 39 is formed, the snap fit portion 38 is pushed and widened when the output shaft 14 is inserted into the insertion hole 17a, and the engagement protrusion 39 and the engagement groove 28 can be easily engaged. Can do. That is, the wiper arm 15 can be fixed to the output shaft 14 by one touch by inserting the output shaft 14 into the insertion hole 17a from the distal end side in the axial direction of the output shaft 14.

  The wiper device 13 is configured so that, for example, when a predetermined load or more is applied to the wiper arm 15 when the swing drive of the wiper arm 15 is hindered by an attachment such as snow attached to the glass surface of the rear glass 12, the straightness of the output shaft 14. The slippage between the portion 26 and the serration portion 36 of the insertion hole 17a prevents the wiper device 13 and the wiper motor from being damaged. The wiper device 13 of the present invention has a structure that can be reattached even when slippage occurs between the straight portion 26 and the serration portion 36 and they cannot be fitted.

  FIG. 8 is a cross-sectional view showing a state where the wiper arm is reattached. In the wiper device 13, even when slippage occurs between the straight portion 26 and the serration portion 36 and they cannot be fitted to each other, the wiper arm 15 is tightened by tightening the nut 40 to the male screw portion 29 of the output shaft 14. Can be reattached to the output shaft 14. When the nut 40 is tightened on the male screw portion 29, the output shaft 14 is further inserted into the insertion hole 17a from the position shown in FIG. 5, and each protrusion of the taper portion 27 bites into the taper receiving surface 37. The surface 37 is fitted. Accordingly, the wiper arm 15 is fixed to the output shaft 14 so as to be able to transmit the rotation.

  As described above, even when slippage occurs between the straight portion 26 and the serration portion 36 and they cannot be fitted, the nut 40 is fastened to the male thread portion 29 of the output shaft 14, and each protrusion of the taper portion 27 is fixed. The wiper arm 15 can be reattached to the output shaft 14 by biting into the tapered receiving surface 37 and fitting the tapered portion 27 and the tapered receiving surface 37 together. The shape and number of the protrusions formed on the taper portion 27 can be arbitrarily set according to a desired slip torque or the like.

  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 embodiment, the wiper device 13 is applied to the rear wiper device. However, for example, the wiper device 13 may be applied to a front wiper device of a vehicle.

  In the embodiment, the fixing member 35 including the snap fit portion 38 is attached to the arm support 17. However, the snap fit portion 38 may be formed integrally with the arm support 17.

  Furthermore, in the above embodiment, the engaging groove 28 is provided on the outer peripheral surface of the output shaft 14 and the engaging protrusion 39 is provided on the inner peripheral surface of the insertion hole 17a. The mating protrusion 39 may be provided and the engaging groove 28 may be provided on the inner peripheral surface of the insertion hole 17a.

It is a rear view of the vehicle carrying the wiper device concerning the present invention. It is an expansion perspective view of a wiper device. It is a partial expansion perspective view of the wiper device in the state where a cover member was removed. FIG. 4 is an exploded perspective view of the wiper device shown in FIG. 3. It is sectional drawing which follows the AA line in FIG. It is sectional drawing which follows the BB line in FIG. (A)-(C) are explanatory drawings explaining the attachment method of a wiper arm. It is sectional drawing which shows the reattachment state of a wiper arm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle 10a Roof part 11 Back door 11a Opening part 12 Rear glass 13 Wiper apparatus 14 Output shaft 15 Wiper arm 16 Wiper blade 17 Arm support 17a Insertion hole 18 Cover member 19 Arm shank 20 Primary lever 21 Secondary lever 21a Holding claw 22 Blade rubber 25 Serration Part 26 Straight part (fitting part)
27 Tapered part (taper fitting part)
28 engaging groove 29 male threaded portion 31, 32 recessed portion 33 mounting hole 33a large diameter hole portion 33b small diameter hole portion 35 fixing member 35a large diameter portion 35b small diameter portion 36 serration portion (fitting portion)
37 Tapered receiving surface 38 Snap fit portion 39 Engaging projection 39a Inclined surface 40 Nut

Claims (6)

An output shaft that is rotationally driven by a drive source;
A wiper arm having an insertion hole into which the output shaft is inserted at a longitudinal base end, and being driven to swing by being fixed to the output shaft;
A wiper device attached to a longitudinal tip of the wiper arm and having a wiper blade for wiping the wiping surface;
A fitting portion that is provided on the outer peripheral surface of the output shaft and includes a plurality of protrusions formed along the axial direction of the output shaft;
A fitted portion that is provided on the inner peripheral surface of the insertion hole and includes a plurality of protrusions formed along the axial direction of the output shaft and is fitted with the fitting portion;
An engagement protrusion provided on either one of the outer peripheral surface of the output shaft and the inner peripheral surface of the insertion hole and protruding in the radial direction of the output shaft toward the other;
An engaging groove that is provided on one of the outer peripheral surface of the output shaft and the inner peripheral surface of the insertion hole and that is notched in the radial direction of the output shaft and engages with the engaging protrusion. A wiper device characterized.   The wiper device according to claim 1, wherein the wiper arm includes a snap fit portion that extends along the outer peripheral surface of the output shaft toward the axial base end side of the output shaft and is divided into a plurality of portions in the circumferential direction. The wiper device according to claim 1, wherein the engagement protrusion or the engagement groove is provided on an inner peripheral surface of the snap fit portion forming the insertion hole.   3. The wiper device according to claim 2, wherein the wiper arm is fixed to the output shaft, and an arm shank is attached to the arm support at a longitudinal base end and the wiper blade is attached to a longitudinal tip. And the snap fit portion is formed integrally with the arm support.   3. The wiper device according to claim 2, wherein the wiper arm is fixed to the output shaft, and an arm shank is attached to the arm support at a longitudinal base end and the wiper blade is attached to a longitudinal tip. And the arm support includes a separate member in which the snap-fit portion is formed. In the wiper device according to any one of claims 1 to 4,
A taper fitting portion that is provided on the outer peripheral surface of the output shaft and is inclined so that the diameter becomes smaller toward the distal end side in the axial direction of the output shaft and includes a plurality of protrusions formed along the inclined direction When,
A taper receiving surface provided on an inner peripheral surface of the insertion hole, facing the taper fitting portion, and inclined so that the diameter decreases toward the tip end side in the axial direction of the output shaft;
A male screw portion formed at an axial tip portion of the output shaft protruding from the insertion hole;
When the nut is fastened to the male screw portion, the protrusion of the taper fitting portion bites into the taper receiving surface, and the taper fitting portion and the taper receiving surface are fitted.   6. The wiper device according to claim 5, wherein the taper fitting portion is continuously formed on an axial base end side of the fitting portion.

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