JPH11180260A - Wiper device provided with friction damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper device that can reduce wiper reversing sound and other noise in various service conditions of a wiper with simple mechanism. SOLUTION: A wiper arm is fitted to a pivot shaft 22, and the pivot shaft 22 is connected to a wiper motor through link mechanism to oscillate the wiper arm. A wiper device of such constitution is provided with a friction damper 30 connected to the link mechanism between the pivot shaft 22 and wiper motor, or to the pivot shaft 22. The friction damper 30 is provided with a cylinder 34 with a cylindrical inner surface, a shaft body 48 rotatably engaged with the cylinder 34, and a frictional resistance generating means 56 exterting frictional resistance in a specified rotating range to relative rotation between the cylinder 34 and shaft body 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device, and more particularly to a wiper device having a friction damper.

[0002]

BACKGROUND OF THE INVENTION In recent years,
As the size of the vehicle increases and the area of the glass increases, the size of the wiper system increases, and as the inertial force of the wiper blade and the wiper arm increases, the reversal sound during the reversal of the wiper tends to increase. Further, in recent years, vehicles have become quieter, and such an increase in wiper reversal noise has become a particular problem as a phenomenon that goes against silence.

As a technique for reducing such wiper reversal sound, there is a technique for reducing the inertial force of a wiper blade and a wiper arm when the wiper is reversed by a shock absorber. The technique disclosed in Japanese Utility Model Laid-Open No. 7-19030 is one of them. In this technique, the buffer member receives the wiper link near the swing position of the wiper link corresponding to the wiper reversal. This buffer member has a double cylindrical shape with a different tip position. When the wiper is at a high speed, the buffer member having a low head position also receives the wiper link, so that the buffering action is higher at a high wiper speed than at a low wiper speed. That is, it is possible to suppress an increase in wiper inversion sound at the time of high speed wiper operation.

However, in this technique, although the elastic coefficient of the cushioning member is different between the low-speed wiper and the high-speed wiper, it is constant at high and low speeds. Therefore, the buffering effect at the time of wiper reversal can be adapted so as to be optimal for the two speeds of the wiper, but it is not possible to obtain the optimal buffering effect for various speeds of the wiper. Therefore, the state of the glass surface,
It is not possible to obtain an optimal buffering effect at the time of wiper reversal corresponding to various different conditions such as battery voltage, temperature, arm length, blade length, arm pressure, motor torque, rotation speed and the like.

[0005] Further, since the buffering action is due to the elasticity of the elastic body, when the wiper is turned over, the received energy is completely returned to the wiper link or the like as a repulsive force, which acts as an impact on the wiper device. On the contrary, it causes an increase in inversion sound and the like.

[0006] As another technique, there is an attempt to reduce the reversal sound by reducing the number of rotations of the motor at the wiper reversal position by electrical control, but the control mechanism is complicated and the cost is greatly increased. I will invite you.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce wiper inversion noise and other noises under various use conditions of a wiper by a simple mechanism. It is to provide a possible wiper device.

[0008]

According to a first aspect of the present invention, there is provided a wiper device, wherein a wiper arm is attached to a pivot shaft, and the pivot shaft is connected to a wiper motor via a link mechanism to swing the wiper arm. In the wiper device, the wiper device includes the link mechanism between the pivot shaft and the wiper motor or a friction damper coupled to the pivot shaft, wherein the friction damper rotates relative to the cylinder having a cylindrical inner surface and the cylinder. A wiper comprising: a shaft body freely engaging; and a frictional resistance generating means for exerting a frictional resistance in a predetermined rotation range with respect to a relative rotation between the cylinder and the shaft body. apparatus.

According to the first aspect of the present invention, the friction damper is connected to the link mechanism between the wiper motor and the pivot shaft of the wiper device or the pivot shaft.
A wiper device having a frictional resistance generating means in which the friction damper exerts a frictional resistance in a predetermined rotation range with respect to the relative rotation between the cylinder and the shaft body is obtained. Accordingly, the wiper device can reduce the swinging speed of the wiper arm near the wiper reversal position by the frictional resistance that can be generated with a simple configuration, and can reduce the wiper reversal sound with a simple mechanism.

According to a second aspect of the present invention, in the wiper device according to the first aspect, the frictional resistance generating means has a pressing member and a pressed member pressed by the pressing member, and the pressing member Has a fixed portion fixed to one of the cylinder or the shaft, an elastic body attached to the fixed portion, and a pressing piece urged against the fixed portion by the elastic body. The pressed member is fixed to the other of the cylinder and the shaft body, and has a slide surface portion on which the pressing piece is pressed and slid within the predetermined rotation range, and the pressing piece includes the pressing member. The sliding surface of the pressed member is pressed with a pressing force that changes according to the distance between the fixed portion of the member and the sliding surface of the pressed member.

According to the second aspect of the present invention, the pressing member having the pressing piece urged by the elastic body with respect to the fixed portion fixed to one of the cylinder and the shaft is the other of the cylinder and the shaft. The sliding surface of the pressed member fixed to the cylinder is pressed to generate frictional resistance between the cylinder and the shaft. The distance between the fixed portion of the pressing member and the slide surface of the pressed member is changed depending on the relative rotation position between the cylinder and the shaft, and is formed so as to be shorter near the position corresponding to the reversal of the wiper. Can be. In that case, the pressing piece urged against the fixed portion by the elastic body and pressing the slide surface portion generates a strong frictional force by pressing the slide surface portion with a stronger pressing force than other positions near the wiper reversal position. The rotation speed between the cylinder and the shaft body is reduced, and the swing speed of the wiper arm to which the friction damper is connected is reduced, thereby suppressing the wiper reversal sound.

According to a third aspect of the present invention, in the wiper device according to the first aspect, the frictional resistance generating means has a pressing member and a pressed member pressed by the pressing member, and the pressing member Is fixed to one of the cylinder or the shaft, the pressed member is fixed to the other of the cylinder or the shaft, and the pressing member is pressed and slid within the predetermined rotation range. Having a slide surface portion and an elastic portion supporting the slide surface portion,
The amount of compression of the elastic portion compressed by the pressing of the slide surface portion by the pressing member may be different depending on a relative rotational position between the cylinder and the shaft.

According to the third aspect of the present invention, the pressing member fixed to one of the cylinder and the shaft presses the slide surface of the pressed portion fixed to the other of the cylinder and the shaft. A frictional resistance is generated between the cylinder and the shaft. The pressed portion is formed of an elastic body, and the amount of deformation of the pressed portion due to the pressing of the pressing member is formed to be different depending on the relative rotation position between the cylinder and the shaft. Therefore, by forming so that the amount of deformation of the pressed member increases near the relative rotation position of the cylinder and the shaft corresponding to the vicinity of the wiper reversal position, the cylinder and the shaft corresponding to the vicinity of the wiper reversal position In the relative rotation position, the reaction force from the pressed member to the pressing member can be increased, thereby increasing the frictional force between them and the rotation acting between the cylinder and the shaft. Is large, the rotation speed between the cylinder and the shaft can be reduced. As a result, the swing speed of the wiper arm to which the friction damper is connected near the wiper reversal position can be reduced, and the wiper reversal sound can be suppressed.

According to a fourth aspect of the present invention, in the wiper device according to the third aspect, the pressed member has a slide surface portion formed of a non-elastic member and an elastic portion for supporting the slide surface portion. The amount of compression of the elastic portion compressed by the pressing of the slide surface portion by the pressing member,
It is characterized in that it is formed differently depending on the relative rotation position of the cylinder and the shaft.

According to the fourth aspect of the invention, the sliding surface of the pressed portion is supported by the elastic portion. The amount of compression of the elastic portion by the pressing of the pressing member is formed to be different depending on the relative rotation position between the cylinder and the shaft. Therefore, by forming the compression amount of the elastic portion to be large in the vicinity of the relative rotation position between the cylinder and the shaft corresponding to the vicinity of the wiper reversal position, the cylinder and the shaft corresponding to the vicinity of the wiper reversal position are formed. In the vicinity of the relative rotation position, the reaction force from the elastic portion to the pressing member can be increased. As a result, the frictional force acting between the cylinder and the shaft increases, the rotation speed between the cylinder and the shaft decreases, and the swing speed of the wiper arm to which the friction damper is connected is reduced to the wiper reversal position. It is possible to suppress the wiper reversal sound by lowering it near.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below more specifically with reference to the drawings.

[First Embodiment] In a wiper device 10 of this embodiment, as shown in FIG. 1, power from a wiper motor 14 is transmitted to a pivot shaft 22 via a link mechanism 18 to rotate the pivot shaft 22. By rotating the wiper arm 26 attached to the pivot shaft 22, the wiper blade 28 attached to the wiper arm 26 is swung to wipe the glass surface.

In the wiper device 10 of the present embodiment,
Friction damper 3 coaxially connected to pivot shaft 22
0 is provided.

As shown in FIG. 2 as a longitudinal sectional view and FIG. 3 as a bottom view, the friction damper 30 is rotatably engaged with a cylinder 34 having a cylindrical inner peripheral surface. Shaft 48, the cylinder 34 and the shaft 4
And a frictional resistance generating means 56 that exerts a frictional resistance in a predetermined rotation range with respect to the relative rotation between the first and second rotation directions. The shaft body 48 has a structure also serving as the pivot shaft 22 of the wiper. The wiper arm 26 is connected to one end of the shaft body 48, and the pivot segment 19 is connected to the other end.

The cylinder 34 has a cylindrical inner peripheral surface, and bearings 35 for rotatably engaging with a shaft body 48 are provided near both ends in the axial direction. In this embodiment, the cylinder 34 is fixed to the vehicle body via the mounting portion 36.

The frictional resistance generating means 56 includes a pressing member 40
And a pressed member 52 pressed by the pressing member 40.

As shown in FIG. 2 and FIG. 4, which is an exploded perspective view of the cylinder 34 in a state before the shaft 48 is mounted, as seen from the side on which the pivot segment 19 is mounted, the pressing member 40 A fixing portion 41 fixed to the mounting portion 37 provided on the outer peripheral surface, a coil spring 43 as an elastic body attached to the fixing portion 41, and a pressing piece 4 urged against the fixing portion 41 by the coil spring 43.
4 is provided. As shown in FIG. 4, the pressing member 40 has a fixing portion 41 mounted in a mounting portion 37 formed in a sheath shape, and a pressing piece 44 combined with a coil spring 43.
Is attached to the fixing portion 41. The fixing portion 41 is provided with a claw 42 with which the flange portion 45 of the pressing piece 44 is engaged. The claw 42 holds the pressing piece 44 urged by the coil spring 43 in the fixing portion 41. Therefore,
The pressing piece 44 can press the pressed member 52 with a pressing force that changes according to the distance between the fixed portion 41 of the pressing member 40 and the pressed member 52.

The pressed member 52 is fixed to the pivot segment 19 (the side facing the pressed portion) attached to the shaft 48, as shown in FIGS. The pressed member 52 includes a slide surface portion 53 on which the pressing piece 44 is pressed and slid within a rotation range corresponding to the swing range of the wiper arm 26. The pressed member 52 is provided with a slope so that the distance between the slide surface portion 53 and the fixing portion 41 of the pressing member 40 changes depending on the rotation position of the shaft 48. This slope is formed such that the distance between the slide surface portion 53 and the fixed portion 41 is reduced at the relative rotation position between the shaft body 48 and the cylinder 34 corresponding to the vicinity of the reversal position of the wiper arm 26. I have. Further, the distance between the slide surface portion 53 and the fixed portion 41 is such that the pressing piece 44 does not contact the slide surface portion 53 near the middle of the rotation range of the cylinder 34 and the shaft 48.

In the wiper device 10 having the friction damper 30 formed as described above, the pressing member 40 having the pressing piece 44 and fixed to the cylinder 34 is used for the pressed member 52 fixed to the shaft 48. When the slide surface 53 is pressed, frictional resistance is generated between the cylinder 34 and the shaft 48. The distance between the fixed portion 41 of the pressing member 40 and the slide surface portion 53 of the pressed member 52 is
It is formed so as to change depending on the relative rotation position between the wiper and the shaft body 48, and becomes shorter near the position corresponding to the reversal of the wiper. Therefore, the pressing piece 44 urged against the fixed portion 41 by the coil spring 43 and pressing the slide surface portion 53 presses the slide surface portion 53 with a stronger pressing force than other positions near the wiper reversing position, and generates a strong frictional force. Is generated, and the rotation speed between the cylinder 34 and the shaft body 48 is reduced. Thereby, the swing speed of the wiper arm 26 to which the friction damper 30 is connected is reduced, and the wiper reversal sound is suppressed.

Further, the wiper device 10 of the present embodiment can reduce the swing speed of the wiper arm near the wiper reversal position by the frictional resistance that can be generated with the simple configuration as described above. The mechanism can reduce the wiper reversal sound.

In the above description, the pressing member 40 is attached to the cylinder 34 and the pressed member 52 is
8 shows an example of attachment. However, the pressing member 40 is attached to the shaft 48 (for example, to the pivot segment 19 fixed to the shaft), and the pressed member 52 is
With respect to the cylinder 34 (for example, the mounting portion 3 shown in FIG. 2).
6) Even if it is attached, the same operation and effect as described above can be obtained.

In the above, the shaft body 48 of the friction damper 30 also serves as the pivot shaft 22, and the friction damper 3
Although the example in which 0 is formed integrally with the pivot shaft 22 has been described, the friction damper 30 may be formed independently of the pivot shaft 22 and connected to the pivot shaft 22 coaxially. In this case, the pivot segment 19 provided in the friction damper 30 does not play a role as a pivot segment, and is a columnar body fixed to the shaft 48.

[Second Embodiment] The wiper device of the second embodiment differs from the first embodiment in the structure of the frictional resistance generating means 57. Other points are the same as those in the first embodiment, and a description thereof will be omitted. The friction damper 7 including the frictional resistance generating means 57 of the present embodiment
4 is provided so as to be coaxially connected to the pivot shaft 22 to which the wiper arm 26 is connected, as in the first embodiment. Further, the friction damper 74 includes a shaft 48 and a cylinder 34 that are formed to be rotatable with respect to each other within a predetermined rotation range. The shaft 48 has a structure that also serves as the pivot shaft 22.

As shown in the bottom view of FIG. 5, the frictional resistance generating means 57 of this embodiment is a pressing member 58 which is a pivot segment 19 fixed to a shaft of a friction damper 74.
And a pressed member 59 fixed to the pivot holder 23 attached to the cylinder 34 of the friction damper 74.

The pressed member 59 is housed in the concave portion 24 provided in the pivot holder 23 near the swinging position of the pivot segment 19 corresponding to the reversal position of the wiper arm 26, and is attached by the rivet 25 to thereby rotate the pivot holder. 23. As shown in FIG. 6 as a cross-sectional view taken along a line VI-VI in FIG. 5, the pressed member 59 includes a sliding surface portion 60 on which the pressing member 58 is pressed and slid, and an elastic portion supporting the sliding surface portion 60. 61. Note that the slide surface portion 60 of the pressing member 58 and a part of the elastic portion 61 are in a state of protruding from the surface of the pivot holder 23, and a part of the slide surface portion 60 is formed with a slope and is connected to the pivot segment 19. Smooth contact is made. The slide surface portion 60 is formed of a hard resin or metal.

The frictional resistance generating means 57 of the present embodiment formed as described above is designed to slide in a portion where the relative rotation position between the cylinder 34 and the shaft 48 of the friction damper 74 corresponds to a position other than near the reverse position of the wiper. Since the surface portion 60 is not pressed by the pivot segment 19 as the pressing member 58, the amount of compression of the elastic portion 61 is zero. In a portion where the relative rotation position between the cylinder 34 and the shaft body 48 of the friction damper 74 corresponds to the vicinity of the reversal position of the wiper arm 26,
The elastic portion 6 is pressed until the sliding surface portion 60 is pressed by the pivot segment 19 as the pressing member 58 and the sliding surface portion 60 becomes equal to the surface position of the pivot segment 19.
1 is compressed. The reaction force corresponding to this is the sliding surface 6
0 to the pivot segment 19, frictional resistance is generated between the pivot segment 19 and the pivot holder 23 to which the pressed member 59 is fixed, and the shaft member 48 and the cylinder 34 to which they are respectively fixed are fixed. A resistance acts on the rotation and acts as a friction damper 74. The frictional resistance gradually increases because the contact area gradually increases until the projecting portion of the slide surface portion 60 and the pivot segment completely overlap.

The wiper device of the present embodiment formed as described above has the same advantages as the wiper device of the first embodiment.

In the above, the pressed member 59 in which the elastic portion 61 and the slide surface portion 60 are formed of different members.
Although the example in which the elastic member and the slide surface portion are integrated is used, an effect similar to the above can be obtained even if a pressed member such as a leaf spring in which the elastic portion and the slide surface portion are integrated is used.

Also, in the above description, an example is shown in which the shaft 48 of the friction damper 74 also functions as the pivot shaft 22 and the friction damper 74 is formed integrally with the pivot shaft 22. 22 and can be coaxially connected to the pivot shaft 22. In the friction damper thus formed, the pivot segment 19 fixed to the shaft 48 is
The pivot holder 23 fixed to the cylinder 34 becomes a columnar body having the same shape as the pivot segment 19, and serves as a plate-shaped cylinder fixing portion.

[Third Embodiment] The wiper device of the third embodiment differs from the wiper device of the first embodiment in the structure of the frictional resistance generating means 62. Other points are the same as in the first embodiment, and a description thereof will not be repeated. The friction damper 75 including the frictional resistance generating means 62 of the present embodiment
Is provided coaxially with the pivot shaft 22 to which the wiper arm 26 is connected, as in the first embodiment. Further, the friction damper 75 includes a shaft 48 and a cylinder 34 that are rotatable relative to each other within a predetermined rotation range, and the shaft 48 has a structure that also serves as the pivot shaft 22.

The frictional resistance generating means 62 of the present embodiment is shown in FIG. 7 as a longitudinal sectional view, and as shown in FIG. 8A as a transverse sectional view at a position along line XX in FIG. The pressing member 64 fixed to the shaft 48 of the damper 75 and the pressed member 6 fixed to the cylinder 34 of the friction damper 75
6 is included.

The pressing member 64 is shown in FIGS. 8A and 8D.
Has a cylindrical shape having a protrusion 65 over a part of the outer peripheral surface. Pressing member 64
As shown in FIG. 8D, the shaft 4 of the friction damper 75
8 and fixed.

The member 66 to be pressed is shown in FIGS.
And (C), it is configured to include an elastic portion 68 and a slide surface portion 67. The elastic part 68 includes the cylinder 34
, And the slide surface portion 67 is fixed to the inner peripheral surface of the elastic portion 68. As shown in FIGS. 8A and 9, the inner peripheral surface of the pressed member 66, that is, the inner peripheral surface of the slide surface portion 67 is formed so that the distance from the axis of the cylinder 34 changes in the circumferential direction. The protruding portion 65 of the pressing member 64 is formed so as to press the slide surface portion 67 at a relative rotation position between the cylinder 34 and the shaft 48 corresponding to a position near the reversal position of the wiper arm 26. More specifically, as shown in FIG. 9, as the pressing member 64 rotates, the protruding portion 65 of the pressing member 64 starts to contact at the point A on the slide surface portion 67, and as the sliding member moves to the point B, the protruding portion 65 The slide surface portion 67 is formed so that the amount of compression of the elastic portion 68 by 65 increases and the amount of compression of the elastic portion 68 becomes substantially constant after point B. The pressed member 66 is similarly formed in a portion corresponding to the opposite rotation direction of the pressing member 64.

The frictional resistance generating means 62 of the present embodiment formed as described above has a structure in which the relative rotation position between the cylinder 34 and the shaft 48 of the friction damper 75 corresponds to a position other than the vicinity of the reversal position of the wiper arm 26. Since the slide surface portion 67 is not pressed by the protrusion 65 of the pressing member 64, the amount of compression of the elastic portion 68 is zero. Also, the friction damper 75
In a portion where the relative rotation position between the cylinder 34 and the shaft body 48 corresponds to the vicinity of the reversal position of the wiper arm 26, the slide surface 67 is pressed by the protrusion 65 of the pressing member 64, and the slide surface 67 is placed on the surface of the protrusion 65. The elastic part 68 is compressed until it becomes equal to the position. Then, a corresponding reaction force is applied from the slide surface portion 67 of the pressed member 66 to the protruding portion 65 of the pressing member 64, and frictional resistance is generated between the pressing member 64 and the pressed member 66, and these are respectively generated. A resistance acts on the rotation of the fixed shaft body 48 and the cylinder 34 to act as a friction damper 75.

The wiper device of the present embodiment formed as described above has the same advantages as the wiper device of the first embodiment.

In the above, the pressed member 66 in which the elastic portion 68 and the slide surface portion 67 are formed of different members.
Although the example in which the elastic member and the slide surface portion are integrated is used, an effect similar to the above can be obtained even if a pressed member such as a leaf spring in which the elastic portion and the slide surface portion are integrated is used.

Further, in the above description, the example in which the shaft body 48 of the friction damper 75 also functions as the pivot shaft 22 and the friction damper 75 is formed integrally with the pivot shaft 22 has been described. 22 and can be coaxially connected to the pivot shaft 22.

[Other Embodiments] In each of the first to third embodiments, the example in which the friction dampers 30, 74, and 75 are integrally connected to the pivot shaft 22 has been described. In the embodiment, a point that any one of the friction dampers 30 shown in each of the first to third embodiments is connected to a link mechanism 18 having a structure for connecting the wiper motor 14 and the pivot shaft 22 is the first point.
The third embodiment is different from the third to third embodiments.

FIG. 10 is a view showing a fourth embodiment.
The entire configuration of a wiper device 70 in which a shaft 48 of a friction damper 30 fixed to a vehicle body is connected to a pivot segment 19 of a link mechanism 18 via a connecting rod 86 and a crank lever 87 is shown. The cylinder 34 of the friction damper 30 is fixed to the vehicle body.

FIG. 11 is a diagram showing the overall configuration of a wiper device 71 according to the fifth embodiment. In this embodiment, the shaft 48 of the friction damper 74 is connected to a connecting rod 86 of the link mechanism 18 via a crank lever 87. The cylinder 34 of the friction damper 74 is fixed to the vehicle body.

FIG. 12 shows the overall structure of a wiper device 72 according to the sixth embodiment. In this embodiment, the wiper device 72 includes a link frame 73, and the friction damper 30, the pivot shaft 22, the wiper motor 14, and the like are fixed to the link frame 73. Therefore, the cylinder 34 of the friction damper 30 is fixed to the vehicle body via the link frame 73. Other points are the same as in the fourth embodiment shown in FIG.

In each of the above embodiments, the friction dampers 30 and 74 are formed such that the relative rotation range between the cylinder 34 and the shaft 48 corresponds to the swing range of the wiper arm 26.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments.
Various modifications can be made within the scope of the present invention or within the equivalent scope of the claims.

For example, in each of the above embodiments, the frictional resistance generating means of the frictional damper generates the frictional resistance only in the vicinity of the rotational position of the shaft and the cylinder of the frictional damper corresponding to the vicinity of the reverse position of the wiper arm. Although the magnitude of the frictional resistance is changed, the pressing member and the pressed member are continuously contacted, and the resistance between the shaft of the friction damper and the cylinder is changed over the entire rotation range of the wiper arm. May be formed.

[0050]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an overall configuration of a wiper device according to a first embodiment.

FIG. 2 is a longitudinal sectional view showing the friction damper of the first embodiment.

FIG. 3 is a bottom view showing the friction damper of the first embodiment.

FIG. 4 is an exploded perspective view showing a cylinder and a pressing member of the friction damper according to the first embodiment.

FIG. 5 is a bottom view showing a friction damper according to a second embodiment.

FIG. 6 is a cross-sectional view taken along a line VI-VI in FIG. 5;

FIG. 7 is a longitudinal sectional view of a friction damper according to a third embodiment.

FIG. 8 is a view showing a friction damper according to a third embodiment;
(A) is a sectional view at a position along line XX in FIG. 7,
(B) is a perspective view showing an elastic portion of the pressed member, (C) is a perspective view showing a sliding surface portion of the pressed member, and (D) is a perspective view showing attachment of the pressing member to a shaft.

FIG. 9 is a partial cross-sectional view illustrating pressing of a pressed member by a pressing member according to a third embodiment.

FIG. 10 is an explanatory diagram illustrating an overall configuration of a wiper device according to a fourth embodiment.

FIG. 11 is an explanatory diagram illustrating an overall configuration of a wiper device according to a fifth embodiment.

FIG. 12 is an explanatory diagram illustrating an overall configuration of a wiper device according to a sixth embodiment.

[Explanation of symbols]

 10, 70, 71, 72 Wiper device 14 Wiper motor 18 Link mechanism 22 Pivot shaft 26 Wiper arm 30, 74, 75 Friction damper 34 Cylinder 40, 58, 64 Pressing member 41 Fixed part 43 Coil spring (elastic body) 44 Pressing piece 48 Shaft 52, 59, 66 Pressed member 53, 60, 67 Slide surface portion 56, 57, 62 Friction resistance generating means 61, 68 Elastic portion

Claims (4)

[Claims] 1. A wiper device in which a wiper arm is attached to a pivot shaft, the pivot shaft is connected to a wiper motor via a link mechanism, and the wiper arm swings, wherein the link mechanism between the pivot shaft and the wiper motor A friction damper connected to the pivot shaft, wherein the friction damper includes a cylinder having a cylindrical inner surface, a shaft body rotatably engaged with the cylinder, For the relative rotation between
And a frictional resistance generating means for exerting a frictional resistance in a predetermined rotation range. 2. The frictional resistance generating means according to claim 1, wherein the frictional resistance generating means has a pressing member and a pressed member pressed by the pressing member, and the pressing member is provided to one of the cylinder and the shaft. A fixed portion fixed to the fixed portion, an elastic body attached to the fixed portion, and a pressing piece urged against the fixed portion by the elastic body, wherein the pressed member is the cylinder or the shaft. The pressing piece is fixed to the other side of the body, and has a sliding surface portion on which the pressing piece is pressed and slid within the predetermined rotation range, and the pressing piece has a fixing portion of the pressing member and a sliding surface portion of the pressed member. The wiper device presses the slide surface of the pressed member with a pressing force that changes according to a distance between the wiper device and the pressing member. 3. The frictional resistance generating means according to claim 1, wherein the frictional resistance generating means has a pressing member and a pressed member pressed by the pressing member, and the pressing member is provided to one of the cylinder and the shaft. The pressed member is an elastic body fixed to the other of the cylinder and the shaft, and having a slide surface portion on which the pressing member is pressed and slid within the predetermined rotation range. A wiper device wherein the amount of deformation of the pressed member deformed by the pressing of the slide surface portion by a member is different depending on a relative rotation position between the cylinder and the shaft. 4. The device according to claim 3, wherein the pressed member has a slide surface portion formed of an inelastic member and an elastic portion supporting the slide surface portion, and the pressing member presses the slide surface portion. A wiper device characterized in that the amount of compression of the elastic portion to be compressed is different depending on the relative rotation position between the cylinder and the shaft.