JP2005104411A - Wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device, giving a suitable error angle to a wiper blade by an inexpensive means regardless of the length of a wiper arm and the radius of curvature of a window. <P>SOLUTION: In this wiper device, a retainer supporting the wiper blade 30 is connected to an arm head 17 to tilt around the axis crossing a pivot 25 of the arm head, and a tilting spring 16 is locked in the retainer 18, whereby the retainer 18 is tilted according to the rocking angle of the wiper arm 20 by the expanding and contracting elastic force of the tilting spring. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wiper device suitable for wiping rain, snow, and the like attached to a window of a vehicle body.

  As one of the conventional wiper devices provided in a vehicle, a wiper device that swings a wiper arm composed of an arm head and a retainer and wipes a window of a vehicle body with a wiper blade supported at the tip of the retainer of the wiper arm is known. It has been. A spring for pressing the wiper blade toward the window is locked to the inside of the retainer in order to increase the wiping ability of the wiper blade.

By the way, in order to wipe the window without causing unwiping by the wiper device, the wiper device is given an angle between the wiper blade and a line perpendicular to the tangent line of the window, that is, an error angle. However, if the error angle is too large, unwiping or chattering will occur. Normally, the window is given a curvature, so that the wiper blade can be wiped appropriately along the curvature of the window without causing wiping or chattering. It is necessary to give an appropriate error angle. Therefore, in the wiper device, in order to tilt the wiper arm according to the swing angle, a cam follower provided at the base of the arm head which is the swing base point of the wiper arm and an annular fixed to the vehicle body facing the cam follower. There has been considered one provided with a cam mechanism including a cam surface (see, for example, Patent Document 1). The cam surface is formed in a wave shape in the circumferential direction so as to tilt the wiper arm along the bending of the window surface in accordance with the swing angle of the wiper arm so as to give an appropriate error angle to the wiper blade. As a result, when the wiper arm swings, the entire wiper arm is tilted by the cam mechanism, so that an error angle corresponding to the swing angle of the wiper arm can be given to the wiper blade.
Japanese Patent Laid-Open No. 7-186891 (page 2-4, FIG. 1)

  However, since the structure of the cam mechanism for tilting the wiper arm and the wiper blade is complicated, the manufacturing cost is increased.

  Further, since the cam mechanism is provided at the swing base point of the wiper arm, the longer the wiper arm is, the more easily the retainer is twisted. For this reason, there is a difference between the tilt angle set on the cam surface and the tilt angle at the tip of the retainer on which the wiper blade is supported, so that the desired tilt is hardly transmitted to the wiper blade. Especially when wiping a window with a small radius of curvature, it is necessary to tilt the wiper blade to give the wiper blade an appropriate error angle according to the shape of the window, but the tilt of the arm head is transmitted to the wiper blade. This makes it difficult to provide an appropriate error angle to the wiper blade.

  Therefore, in order to tilt the wiper blade more greatly in order to give an appropriate error angle to the wiper blade, it is conceivable to increase the difference between the crest and trough of the cam surface. According to this, since the wiper arm is largely tilted, the tilt is easily transmitted to the wiper blade. However, a large friction is generated between the cam follower and the cam surface, so that noise may be generated.

  An object of the present invention is to provide a wiper device that can give an appropriate error angle to a wiper blade by inexpensive means regardless of the length of the wiper arm, the radius of curvature of the window, and the like.

  In order to solve the above-described problems, the present invention provides a wiper blade, and the wiper blade that supports the wiper blade to wipe a window of a vehicle body with the wiper blade, and the wiper blade has an error angle corresponding to the swing angle of the wiper arm A wiper arm that swings about a rotation axis to reciprocate along the window, wherein the wiper arm supports an arm head fixed to the rotation axis and the wiper blade. A retainer pivotally attached to the arm head via a pivot so as to allow the wiper blade to be pressed toward the window, and tiltable about an axis across the pivot of the arm head; and A first spring that provides the retainer with a rotational force about the pivot toward the window to the retainer and the error angle forward. A second spring that tilts the retainer with a stretching elastic force to be applied to the wiper blade, and the stretching elastic force of the second spring is greater than the torsional elastic force generated in the first spring by the tilting of the retainer. It is characterized by that.

  In the above configuration, since the expansion / contraction elastic force of the second spring for tilting the retainer is stronger than the torsional elastic force generated in the first spring due to the tilt of the retainer, when the wiper arm swings, the first spring The retainer can be reliably tilted without being hindered by the torsional elastic force. As a result, the retainer can be tilted by inexpensive means without using a complicated cam mechanism as in the prior art, and an increase in manufacturing cost can be suppressed. Moreover, the generation of noise due to friction as in the prior art is suppressed.

  Further, since the wiper arm is not tilted as a whole, but the retainer that supports the wiper blade is tilted without using the arm head, the retainer is not greatly twisted as in the prior art. For this reason, even if the wiper arm is long or a window having a small curvature radius, the wiper blade can be appropriately tilted according to the swing angle of the wiper arm. Thereby, it is possible to easily give an appropriate error angle to the wiper blade.

  According to the present invention, the retainer that supports the wiper blade is tiltable about an axis that traverses the pivot between the retainer and the arm head, and the first spring has the elastic elasticity of the second spring. Can be reliably tilted without being hindered by the torsional elastic force. Therefore, since the retainer can be tilted by an inexpensive means without using a cam mechanism having a complicated structure as in the prior art, an increase in manufacturing cost can be suppressed. In addition, since the retainer that supports the wiper blade is tilted without passing through the arm head, the tilt is easily transmitted to the wiper blade.Therefore, an appropriate error angle is given to the wiper blade regardless of the length of the wiper arm and the curvature of the window. Can be given easily.

  The wiper device according to the present invention will be described below with reference to the illustrated embodiments.

  In the present embodiment, an example in which the present invention is applied to a wiper device for wiping rain, snow, and the like attached to a window of a vehicle body is shown.

  As shown in FIG. 1, a wiper device 10 according to the present invention has a rotating shaft 12 protruding from a cowl cover 11 on a cowl cover 11 provided on the vehicle body in the vicinity of the window of the vehicle body for ventilation inside the vehicle (not shown). And a wiper arm 20 that swings around the rotation axis.

  The rotary shaft 12 is swingably supported by a support member 13 disposed under the cowl cover 11, and as is well known, by driving a wiper motor (not shown) provided on the vehicle body, It rotates by reversing the rotation direction alternately within a predetermined angle range via the link mechanism. The support member 13 has a triangular plane, and a bracket 14 that protrudes upward through the cowl cover 11 in the vicinity of the rotating shaft 12 is integrally provided at one edge 13a. A hole 15 is formed in a portion of the bracket 14 protruding from the cowl cover 11. As will be described later, the tilting spring 16 is locked in the hole 15.

  As shown in FIGS. 1 and 2, the wiper arm 20 includes an arm head 17 fixed to the rotary shaft 12, and an elongated retainer 18 that supports the wiper blade 30 and is pivotally attached to the arm head 17. Prepare.

  In the illustrated example, the arm head 17 has a square-shaped planar shape. The arm head 17 has a shaft hole 19 formed at one end 17a thereof and is coupled to the rotary shaft 12 so as to swing integrally therewith, and the other end 17b opens to both side surfaces 21 of the arm head 17. An insertion hole 22 is formed in parallel to the cowl cover 11.

  The retainer 18 connected to the arm head 17 includes a pair of plate-like side portions 23a and 23b, and a plate-like top portion 24 connecting the side portions over the entire length of each side portion. It has a letter-shaped cross section. Each of the side portions 23a and 23b has a uniform length in the longitudinal direction including one end 18a of the retainer 18 in the longitudinal direction, and the other half including the other end 18b of the retainer 18 toward the other end 18b. Has a gradually decreasing height. A pair of semicircular connecting portions 26 are provided at one end 18 a of the retainer 18 for connection with the arm head 17. The connecting portions are connected to the side portions 23 a and 23 b and extend in the axial direction of the retainer 18, and support the pivot shaft 25 inserted through the insertion hole 22 of the arm head 17. Accordingly, the retainer 18 swings integrally with the arm head 17 by swinging. A plate-like arm piece 27 for supporting the wiper blade 30 is provided at the other end 18 b of the retainer 18. One end 27a of the arm piece 27 is folded in a U shape, and the other end 27b is bent at an angle so as to facilitate locking of the one end 34a of the pressing spring 34, as will be described later. The arm piece 27 is attached to the top 24 in the retainer 18 so that one end 27 a protrudes from the other end 18 b of the retainer 18 and the other end 27 b faces inward of the retainer 18. A wiper blade 30 is supported on the U-shaped one end 27 a of the arm piece 27 via a pin 28 so as to be swingable around the pin. The wiper blade 30 is engaged with one end 27 a of an arm piece 27 provided on the retainer 18, so that the wiper blade 30 swings along the window by the integral swinging of the retainer 18 and the arm head 17, that is, the wiper arm 20 swinging. To do. Thereby, the wiper blade 30 wipes the window with the blade rubber 29.

  Inside the retainer 18, a pressing spring 34, which is a first spring 34, is provided along the retainer 18. The pressing spring 34 is a coil spring. One end 34 a of the pressing spring 34 is locked to the other end 27 b of the arm piece 27 so as not to twist, and the other end 34 b is a hook-like shape fixed to the arm head 17. It is locked to the arm head 17 via the hook spring 35. As shown in FIG. 3, the hook spring 35 is recessed through a pin 38 provided in parallel with the pivot 25 of the retainer 18 in a recess 37 having a fan-shaped side surface formed on the lower surface 17 c of the arm head 17. 37 is fixed so as to be sandwiched within 37. As a result, the hook spring 35 is restrained from axial movement of the pin so that twisting around the pin 38 is suppressed. The pressing spring 34, together with the hook spring 35, gives the retainer 18 a rotational force around the pivot 25 toward the window, and presses the blade rubber 29 against the window. Thereby, the wiping capability of the wiper blade 30 is enhanced.

  In the wiper device 10 according to the present invention, the retainer 18 is provided with an arm head in order to appropriately give the wiper blade 30 an angle, that is, an error angle formed by the vertical center line of the wiper blade 30 and a line perpendicular to the tangent line of the window. It is connected to 17 so that it can tilt. The connection structure between each connecting portion 26 of the retainer 18 and the arm head 17 will be described in more detail with reference to FIG. A pair of inclined grooves 31 are formed on the inner peripheral surface 22a of the insertion hole 22 of the arm head 17 that receives the pivot 25 that connects the retainer 18 and the arm head 17 at the mating position. By forming each inclined groove 31, the retainer 18 has an upright position (shown in FIG. 4A) where the pivot 25 is located in the insertion hole 22 and a tilt position where the pivot 25 is located in both the inclined grooves 31 ( 4 (b), it is possible to tilt around an axis line that intersects the pivot 25 between the retainer 18 and the arm head 17. The tilt angle θ of the retainer 18, which is an angle formed by the axis of the pivot shaft 25 of the retainer 18 and the axis of the insertion hole 22 of the arm head 17, is an inclination angle from the inner peripheral surface 22 a of the insertion hole 22 of each inclined groove 31. Therefore, the tilt angle can be appropriately set so as to obtain a desired maximum tilt angle θ. The outer end portions 32a and 32b of the inclined grooves 31 and the portions 33a and 33b of the connecting portions 26 facing the outer end portions are formed in curved surfaces corresponding to each other. Thereby, tilting of the retainer 18 becomes smooth.

  Further, as shown in FIG. 2, the retainer 18 is moved around the axis crossing the pivot 25 between the retainer and the arm head 17 when the wiper arm 20 swings. A tilting spring 16 that is a second spring 16 for tilting toward the tilting position in the direction of is provided. The tilting spring 16 is a coil spring, and has a spring portion 41 wound in a spiral shape, a first straight portion 42 extending linearly from one end 41 a of the spring portion, and a straight shape from the other end 41 b of the spring portion 41. And a second linear portion 43 extending in the direction. Locking portions 44 and 45 bent in an annular shape are provided at the ends 42a and 43a of the straight portions 42 and 43, respectively. Of the pair of side portions 23a and 23b, the one side portion 23a that is on the upper side at the return position where the wiper arm 20 is placed below the window so as not to obstruct the field of view has a locking hole 46 below the vicinity of the center thereof. Is formed. Further, a groove 48 that opens to the lower edge 47 is formed on the other side portion 23b that is located on the lower side at the return position. The first linear portion 42 extends from the outside of the retainer 18 to the inside of the retainer 18 through the groove 48, and extends through the retainer 18. It is locked from. Further, as described above, the locking portion 45 of the second linear portion 43 is locked to the hole 15 of the bracket 14 protruding from the cowl cover 11 in the vicinity of the rotating shaft 12. As shown in FIG. 5, the first linear portion 42 is displaced in the groove 48 according to the tilting and swinging of the retainer 18. Due to the guiding action of the groove 48, the first linear portion 42 can move in the groove 48 without hindering the tilting and swinging of the retainer 18.

  As shown in FIG. 6, the tilting spring 16 is located between the return position of the wiper arm 20 (shown in FIG. 6A) and the reversal position of the reciprocating motion of the wiper arm (shown in FIG. 6C). In the middle position (shown in FIG. 6 (b)) of the rocking range, no load is applied, and therefore a free state in which the compression deformation force and the expansion deformation force are not received is set. Further, the tilting spring 16 receives a compressive deformation force in the swing angle region of the wiper arm 20 from the intermediate position toward the return position, and receives an expansion deforming force in the swing angle region from the intermediate position toward the reverse position. . On the other hand, the pressing spring 34 is wound in the right-handed direction when viewed from the other end 34b side where the winding 36 is engaged with the hook spring 35, and, as described above, one end 34a is wound on the arm piece. The other end 27b of the pin 27 is locked so as not to be twisted, and the hook spring 35 is restrained from twisting around the pin 38. For this reason, when the rotational force toward the tilting position acts on the retainer 18, since the integral rotation around the axis of the pressing spring 34 itself is prevented, the winding 36 of the pressing spring 34 is released. Torsional deformation force. As a result, the torsional elastic force acts on the retainer 18 as a rotational force toward the upright position. In order to reliably tilt the retainer 18, the expansion / contraction elastic force of the tilting spring 16 is set larger than the torsional elastic force of the pressing spring 34.

  FIG. 7 is a graph showing the relationship between the swing angle of the wiper arm 20 and the elastic forces of the tilting spring 16 and the pressing spring 34 that act on the retainer 18. The horizontal axis of the graph in FIG. 7 indicates the swing angle of the wiper arm 20 from the return position. The vertical axis indicates the elastic force of each spring 16, 34 acting on the retainer 18. As seen in FIG. 4, the direction acting to rotate the retainer 18 counterclockwise toward the tilt position is the positive direction. The direction acting to rotate clockwise toward the standing position is shown as the negative direction. Changes in the elastic force of the tilting spring 16 are indicated by characteristic lines 50 (50a, 50b), and changes in the elastic force of the pressing spring 34 are indicated by characteristic lines 51 (51a, 51b).

  When the swing angle of the wiper arm 20 changes from 0 ° to 40 °, that is, while the wiper arm 20 moves from the return position to the intermediate position, the retainer 18 has a tilting spring 16 that changes along the characteristic line 50a. The reaction force due to the compression deformation acts as a rotational force toward the upright position. For this reason, since the retainer 18 is held in the upright position, the pressing spring 34 is not twisted, and the elastic force of the pressing spring 34 does not act on the retainer 18 as indicated by the characteristic line 51a. Therefore, in the swing angle region from 0 ° to 40 °, only the elastic force of the tilting spring 16 as shown by the characteristic line 50a acts on the retainer 18, so that the retainer 18 is held in the upright position.

  At the intermediate position where the swing angle of the wiper arm 20 is 40 °, the tilting spring 16 is unloaded because it is unloaded, so the retainer 18 is not acted on by the tilting spring 16 and is held in the upright position. Is done. For this reason, no twist is generated in the pressing spring 34, and therefore, no rotational force is exerted on the retainer 18 from either of the springs 16 and 34 toward the upright position or the tilting position.

  When the swing angle of the wiper arm 20 changes from 40 ° to around 80 °, that is, while the wiper arm 20 moves from the intermediate position to the reverse position, the tilting spring 16 is gradually extended according to the swing angle of the wiper arm 20. Therefore, a reaction force due to the stretching deformation of the tilting spring 16 that changes along the characteristic line 50b acts on the retainer 18 as a rotational force toward the tilting position. At this time, as described above, the torsional elastic force of the pressing spring 34 that changes along the characteristic line 51b acts on the retainer 18 as a rotational force toward the upright position. Since the expansion / contraction elastic force of the tilting spring 16 is larger than the torsional elastic force of the pressing spring 34, the torsional elastic force of the pressing spring 34 is subtracted from the reaction force due to the stretching deformation of the tilting spring 16 to the retainer 18. The resultant force acts as a rotational force toward the tilt position. This resultant force changes along the characteristic line 52 and gradually increases in a linear function as the swing angle of the wiper arm 20 increases. As will be described later, this resultant force acts on the retainer 18 as a force that tilts the retainer 18 counterclockwise.

  FIG. 8 shows the swing angle of the wiper arm 20 when the elastic force is applied to the retainer 18 from the tilting spring 16 and the pressing spring 34, the tilt angle θ of the retainer 18, and the error angle E given to the wiper blade 30. It is a graph which shows the relationship with each. The horizontal axis of the graph in FIG. 8 is the swing angle of the wiper arm 20, and the swing angles in the graphs (a), (b), and (c) are respectively determined by the wiper arm 20 in FIGS. ) And (c) show the rocking angle. Moreover, the attitude | position of the retainer 18 corresponding to the rocking | fluctuation angle of (a), (b), and (c) of a graph is shown to (a), (b), and (c) of FIG. The vertical axis of the graph of FIG. 8 is the tilt angle θ and the error angle E of the retainer 18, and the tilt angle when the retainer 18 tilts toward the tilt position is the positive direction, and when the tilt is tilted toward the upright position. The tilt angle is the negative direction. Further, the error angle E when the wiper blade 30 is inclined with respect to the window surface in the wiping direction from the upright position to the reverse position of the wiper arm 20 is defined as a positive direction, and the opposite is defined as a negative direction. The tilt angle θ of the retainer 18 is indicated by a characteristic line 52 (52a, 52b), and the error angle E is indicated by a characteristic line 53 (53a, 53b).

  When the swing angle of the wiper arm 20 changes from 0 ° to 40 °, as shown in FIGS. 9A and 9B, the retainer 18 is not tilted and is held in the upright position. Remains zero along the characteristic line 52a. At this time, the error angle E changes along the characteristic curve 53a.

  When the swing angle of the wiper arm 20 is 40 °, as shown in FIG. 9B, the retainer 18 is not tilted and is held in the upright position, so the tilt angle θ is zero. At this time, the error angle E begins to gradually decrease toward 0 °, that is, the direction in which the wiper blade 30 is substantially perpendicular to the window.

  When the swing angle of the wiper arm 20 changes from 40 ° to around 80 °, the retainer 18 has a resultant force of the reaction force due to the stretching deformation of the tilting spring 16 and the torsional elastic force of the pressing spring 34 as described above. Since it acts as a rotational force toward the tilt position, the retainer 18 tilts toward the tilt position while changing the tilt angle θ along the characteristic line 52b. At the inverted position of the wiper arm 20, as shown in FIG. 9C, the retainer 18 is held at the tilt position at the maximum tilt angle θ. In this swing angle region, the error angle E is approximately 0 °.

  When the wiper arm 20 returns from the reverse position to the return position, the retainer 18 moves while changing the tilt angle θ along the characteristic lines 52b to 52a. Accordingly, the error angle E given to the wiper blade 30 changes along the characteristic lines 53b to 53a.

  According to the present embodiment, as described above, the expansion / contraction elastic force of the tilting spring 16 for tilting the retainer 18 is stronger than the torsional elastic force generated in the pressing spring 34 due to the tilting of the retainer 18. When the shaft swings, the retainer 18 can be reliably tilted without being hindered by the torsional elastic force of the pressing spring 34. As a result, the retainer 18 can be tilted by an inexpensive means without using a complicated cam mechanism as in the prior art, and an increase in manufacturing cost can be suppressed. Moreover, the generation of noise due to friction as in the prior art is suppressed.

  Further, as described above, since the retainer 18 that supports the wiper blade 30 rather than the entire wiper arm 20 is tilted without the arm head 17, the retainer 18 is unlikely to be twisted as in the prior art. Further, since the tilting spring 16 is locked in the locking hole 46 formed in the central portion of the retainer 18 as described above, when the retainer 18 is tilted, the retainer 18 is tilted evenly over its entire length. Can be made. Therefore, even if the wiper arm 20 is a long window or a window having a small curvature radius, the wiper blade 30 can be appropriately tilted according to the swing angle of the wiper arm 20. Thereby, an appropriate error angle can be easily given to the wiper blade 30.

  Further, according to the present embodiment, as described above, the error angle change width L can be narrowed in the swing angle region of the wiper arm 20. In general, if the error angle change width L is wide within the swing range of the wiper arm 20, unwiping or chattering may occur and appropriate wiping cannot be performed. However, in the present invention, the error angle change width L is narrow. Therefore, the window can be wiped off reliably. Further, since the change width L is narrow, it is difficult to apply a load to the blade rubber 29, so that the blade rubber 29 can be prevented from being consumed at an early stage.

  As described above, the tilting spring 16 can be easily incorporated into the wiper device 10 at the tips 42a and 43a of both the linear portions 42 and 43, so that an increase in the manufacturing process can be suppressed. In addition, as described above, since the tilting spring 16 is locked in the vicinity of the wiper arm, it is possible to prevent the appearance from being uncomfortable. Further, since the first linear portion 42 is restrained from moving in the width direction of the guide groove within the guide groove 48, the wiper arm 20 may be subjected to an external force due to, for example, a change in contact resistance between the blade rubber 29 and the window surface. Even when receiving, the tilt angle θ of the retainer 18 is prevented from deviating from the tilt angle θ corresponding to the swing angle of the wiper arm 20. Thereby, an appropriate error angle can be more reliably given to the wiper blade 30.

  In the present embodiment, the pressing spring 34 and the tilting spring 16 are both coil springs, but instead of these, a spring other than the coil spring can be used in the present invention. Further, the example in which the locking portion 45 of the second linear portion 43 of the tilting spring 16 is locked to the bracket 14 protruding from the cowl cover 11 is shown, but instead of forming the bracket 14, the cowl cover 11 may be formed with a hole or a protrusion for locking the locking portion 45 of the second linear portion 43.

  In addition, although the example in which the pressing spring 34 is locked to the arm head 17 via the hook spring 35 is shown, the pressing spring 34 is directly armed so that the pressing spring 34 does not rotate due to the tilt of the retainer 18. It can be locked to the head.

  Furthermore, although the example in which the arm head 17 has a square-shaped plane has been shown, an arm head having a rectangular plane can also be used in the present invention.

It is a perspective view showing roughly the wiper arm concerning the present invention. 1 is a side perspective view schematically showing a wiper arm and a wiper blade according to the present invention. FIG. 3 is a cross-sectional view of the arm head taken along line I-I in FIG. FIG. 3 is a cross-sectional view of the arm head taken along the line II-II in FIG. 2, in which (a) shows a state where the retainer is in an upright position, and (b) shows a state where the retainer is in a tilting position. It is the side view to which the principal part of the retainer concerning this invention was expanded. It is a top view which shows schematically the wiper arm and tilting spring which concern on this invention, (a) shows the state which has a wiper arm in a return position, (b) shows the state which has a wiper arm in an intermediate position, (c) Indicates a state in which the wiper arm is in the reverse position. It is the graph which showed the relationship between the rocking | fluctuation angle of the wiper arm which concerns on this invention, and each of the elastic force of the spring for tilting which acts on a retainer, and a pressing spring. 6 is a graph showing the relationship between the swing angle of the wiper arm according to the present invention and the tilt angle and error angle of the retainer. The cross-sections of the arm pieces schematically showing the postures of the arm pieces corresponding to the swing angle positions of (a), (b) and (c) of FIG. 8 in (a), (b) and (c), respectively. FIG.

Explanation of symbols

30 Wiper blade 12 Rotating shaft 20 Wiper arm 10 Wiper device 17 Arm head 25 Pivot 18 Retainer 34 First spring (pressing spring)
16 Second spring (tilting spring)
22 Insertion hole 21a, 22b side surface (side surface of arm head)
26a, 26b Connecting portion 22a Inner peripheral surface 31a, 31b Inclined groove 32a, 32b Outer end portion 11 Cowl cover 14 Bracket 13 Support member 23a, 23b Side portion 24 Top portion 46 Locking hole 47 Lower edge 48 Guide groove 41 Spring portion 41a One end (One end of the spring part)
42a tip (tip of the first straight part)
44 Locking portion 42 Straight portion (first straight portion)
18b Tip (the other end of the retainer)
27 Arm piece 34a One end (one end of the first spring)
34b The other end (the other end of the first spring)
35 hook spring 36 winding

Claims (7)

A wiper blade and a rotary shaft for reciprocating the wiper blade along the window with an error angle corresponding to a swing angle of the wiper arm, supporting the wiper blade to wipe the window of the vehicle body with the wiper blade A wiper device comprising a wiper arm that swings about
The wiper arm is pivotally attached to the arm head via a pivot so as to support the wiper blade and allow the wiper blade to be pressed toward the window. A retainer tiltable about an axis transverse to the pivot axis of the head; a first spring that imparts rotational force about the pivot axis toward the window to the retainer to press the arm blade against the window; A second spring that tilts the retainer with a stretching elastic force to give the error angle to the wiper blade;
The wiper device according to claim 1, wherein the elastic elastic force of the second spring is larger than the torsional elastic force generated in the first spring by the tilting of the retainer.   The arm head is formed with an insertion hole that allows the pivot shaft to be inserted, and the retainer has a pair of connecting portions that can contact both side surfaces of the arm head and support the pivot shaft. A pair of inclined grooves for allowing the retainer to tilt is formed at an even position on the inner peripheral surface, and each outer end portion of each inclined groove and each of the connecting portions facing each outer end portion are formed. The wiper device according to claim 1, wherein curved portions corresponding to each other are formed in the portion so that the tilting of the retainer is smooth.   The second spring is not subjected to a load at an intermediate position in the swing range between the feedback position and the reverse position of the wiper arm, and receives a compressive deformation force in an angular region from the intermediate position toward the return position. 2. The wiper device according to claim 1, wherein the wiper device receives a stretching deformation force in an angle region from the intermediate position toward the reversal position. One end of the second spring is locked to the retainer, and the other end is locked to a bracket that protrudes upward through a cowl cover provided on the vehicle body in the vicinity of the window,
The wiper device according to claim 1, wherein the bracket is provided integrally with a support member that is disposed below the cowl cover and supports the rotating shaft.   The retainer has a U-shaped cross section including a pair of side portions and a top portion connecting the side portions, and the one end of the second spring is locked to one side portion. The wiper device according to claim 1, wherein a locking hole is formed. A guide groove that opens to the lower edge of the retainer is formed on the other side of the retainer, and the second spring includes a spirally wound spring portion and the guide groove from one end of the spring portion. A linear portion provided with a locking portion that extends through the retainer and that is locked to the locking hole of the one side portion at the tip;
The wiper device according to claim 5, wherein the guide groove allows the linear portion to move in accordance with swinging and tilting of the retainer. The wiper blade is supported by the retainer with an arm piece provided at the tip of the retainer, and the retainer is held in an upright position at its return position,
The first spring is a coil spring disposed inward of the retainer along the retainer, one end of which is locked to the retainer via the arm piece, and the other end in the axial direction of the pivot. It is locked to the arm head via a hook spring with restricted movement,
2. The wiper device according to claim 1, wherein the first spring receives a twisting force in a direction in which the winding of the coil spring is released when the retainer tilts in one direction from the upright position. .

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