JP2917791B2 - Wiper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device.

[0002]

2. Description of the Related Art As shown in FIGS. 1 and 2, rain and snow adhering to a windshield glass of a vehicle are disposed at a predetermined position below a front side of a windshield glass (hereinafter simply referred to as "glass") 2 of a vehicle body 1. The wiper device 3 wipes it off. The wiper device 3 includes a pivot 4 rotatably disposed on the vehicle body 1, an arm head 5 having a base end fixed to a tip of the pivot 4, and a pivot having a base end capable of being raised and lowered at the tip of the arm head 5. A wiper arm 8 including a supported retainer 6 and an arm piece 7 whose base end is fixed to the distal end of the retainer 6, and a pin that has a central portion at the distal end of the arm piece 7 and is swingable in the axial direction of the arm piece 7. 9 is supported by a wiper blade 10 supported by the wiper blade 10 and a spring (not shown) provided between the distal end of the arm head 5 and the base end of the arm piece 7. A blade rubber 11 pressed against the surface of the glass 2 and a pivot 4 disposed on the vehicle body 1 side;
And a driving device (not shown) for rotating the motor over a predetermined range. The pivot 4 rotates the wiper arm 8, and the blade rubber 11 wipes rain, snow, and the like attached to the surface of the glass 2.

[0003] In the wiper device 3, the axial direction of the pivot 4 is constant over the entire rotation range of the wiper arm 8. Therefore, the angle θ between the wiper blade 10 and the surface of the glass 2
(Hereinafter, referred to as “error angle”) greatly changes in accordance with a change in curvature in a range where the glass 2 is wiped. Generally, the value of the error angle θ is approximately ± 4 ° <θ, where the direction in which the wiper blade 10 wipes up from the stop position (counterclockwise) is positive, and the direction in which the wiper blade 10 wipes down (clockwise) is negative.
The tilt of the pivot 4 is set so as to be in a range of <± 8 °.

When the error angle changes significantly, a very thin film of water is formed due to water droplets attached to the glass surface, or when the wiper blade 10 is turned over, the blade rubber 11 cannot be turned over and the glass There is a problem that wiping defects such as jumping and a phenomenon called so-called chatter occur.

[0005]

By the way, when the wiping speed (rotating speed) of the wiper is low or intermittent operation, the wiper arm is swung in synchronization with the wiping speed to maintain the error angle in an ideal range. However, since the moving speed of the wiper blade is very fast during high-speed wiping, even if the wiper arm is swung, it is difficult for the swing speed or swing control speed to follow the changing speed of the error angle. Therefore, it is difficult to control the error angle in accordance with the rotation speed of the wiper, and chattering noise is generated and becomes noise. Also, the computer in the control device
There is also a problem that a high-performance one with a high information processing speed is required, and it becomes expensive.

The present invention has been made in view of the above points, and when the wiping speed of the wiper is high, the wiper arm is swung in the wiping direction after the reversal when the wiper arm is reversed so that the blade rubber can be easily reversed. It is an object of the present invention to provide a wiper device configured to perform the above operation.

[0007]

According to the present invention, a wiper arm having a base end mounted on an upper end of a pivot and a wiper blade provided at a distal end is rotated by the pivot to form a glass surface. A wiper device that is interposed between an upper end of the pivot and a base end of the wiper arm, and that supports the wiper arm so as to be relatively non-rotatable with the pivot and swingably in a wiping direction; A drive mechanism interposed between a pivot and a base end of the wiper arm for swinging the wiper arm; and detecting the wiping speed of the wiper arm and controlling the drive mechanism at high speed to wipe the wiper arm.
A control means for swinging in the wiping direction after reversing just before the reversing position of both ends of the row is provided.

[0008]

The support mechanism rotates the base end of the wiper arm at the upper end of the pivot together with the pivot and supports the wiper arm so as to be swingable in the wiping direction of the wiper arm. Control means operates in response to the pivot of the rotation, when the wiping speed of the wiper arm during high-speed by controlling the driving mechanism, the wiping stroke ends
The wiper arm is swung in the wiping direction after the inversion before the inversion position . Therefore, when the wiper arm reaches the reversal position,
Is ready to follow the wiping operation after reversing
Since that is on purpose, generation of chatter is suppressed by inverting the smooth.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 3 and 4, the pivot 21 of the wiper device 20 is configured such that the upper end 21b of the shaft portion 21a is formed in a spherical shape having a larger diameter than the shaft portion 21a (hereinafter, referred to as “spherical portion 21b”). A continuous portion 21c with the portion 21a is formed in a tapered shape (hereinafter, referred to as a "tapered portion 21c"). That is, the upper end of the pivot 21 has a ball joint structure. Then, the tapered portion 2 of the pivot 21
1c, a long slot 21d flat along the axial direction
Are penetrated perpendicularly (X-axis direction) in the axial direction (Z-axis direction) and the axial direction (Y-axis direction) of the wiper arm. A flat shaft (hereinafter referred to as a “flat shaft”) 22 is provided in the elongated hole 21d.
Are press-fitted, and both ends 22a and 22b
1 protrudes the same length on both sides.

On the other hand, the base end 23a of the arm head 23 constituting the wiper arm has a cylindrical shape and has a lower portion 23a.
b has a slightly larger diameter, and holes 23c to 23e are provided in the axial direction. The hole 23d has an upper portion that is recessed into a hemisphere and opens toward the upper hole 23c, and a lower portion is tapered and has a larger diameter. And is open to the lower hole 23e. Holes 23c, 23e
Has a larger diameter than the spherical portion 21b of the pivot 21, the hole 23d has a concave portion slightly larger than the spherical portion 21b, and a tapered portion formed larger than the taper angle of the tapered portion 21c of the pivot 21. Further, the shaft portion 21a can be penetrated with a slight gap. The lower portion of the hole 23e is enlarged in accordance with the outer diameter.

Further, slits 23f and 23g, which are flat in the axial direction along the axial direction, are provided at both ends in the diameter near the center of the side wall of the hole 23e at the base end 23a. The direction of the diameter at which these slits 23f and 23g are arranged is:
The direction matches the direction perpendicular to the axial direction of the wiper arm, that is, the wiping direction of the wiper arm. And the slit 23
f and 23g are set slightly wider than the flat shaft 22 provided on the pivot 21.

The arm head 23 is mounted on the upper end of the pivot 21, the lower half of the spherical portion 21b is slidably fitted in the recess of the hole 23d, and both ends 22a, 22
b is in the longitudinal direction (axial direction) in slits 23f and 23g, respectively.
To be slidably inserted into. Then, cap 2 is inserted into hole 23c.
4 is fitted and fixed to the partition wall with the hole 23d by the screw 25. The cap 24 has a hemispherical recess corresponding to the recess of the hole 23d in the center of the lower surface, and is slidably fitted to the upper half of the spherical portion 21b of the pivot 21. That is, the base end 23 a of the arm head 23 is supported on the upper end of the pivot 21 by the ball joint structure.

The arm head 23 has two ends 22.
The flat shafts 22 a and 22 b are supported by the flat shafts 22 fitted in the slits 23 f and 23 g so as to be unable to rotate relative to the pivot 21. The flat shaft 22 has flat sides at both ends 22a and 22b in sliding contact with both sides of the slits 23f and 23g, respectively, and a mounting position with the pivot 21 is the arm head 23.
Of the pivot 21, that is, below the center of the spherical portion 21 b of the pivot 21 (displaced), the arm head 23 moves the axis of the pivot 21 with respect to the axial direction (Y-axis direction) of the wiper arm. Swinging (undulating) in the direction (Z-axis direction) is prevented. Note that the shaft 22 does not necessarily need to be a flat shaft, and may be a round bar.

Further, the arm head 23 can swing in the wiping direction of the wiper arm about the spherical portion 21b by moving the opposite ends 22a and 22b of the flat shaft 22 in the slits 23f and 23g in opposite directions. Is done. That is, the arm head 23 rotates in the directions of arrows A and A 'together with the pivot 21 and can swing in the wiping direction of the wiper blade indicated by arrows B and B'. The swing range of the arm head 23 is determined by the slits 23f and 2f.
A desired range can be determined by adjusting the distance between each upper end surface of 3 g and each upper end surface of both ends 22 a and 22 b of the flat shaft 22 opposed to each other. Thus, the support mechanism 26 that supports the arm head 23 on the pivot 21 is configured. Note that a wiper arm and a wiper blade (both not shown) are attached to a tip 23h of the arm head 23.

A drive mechanism 30 for swinging the arm head 23 is interposed between the lower part of the pivot 21 and the lower end of the base end 23a of the arm head 23, as shown in FIG. The drive mechanism 30 uses a hydraulic actuator, and includes a support base 31, a hydraulic cylinder 3
2, 33 and rods 34, 35, links 36, 37,
It comprises a hydraulic cylinder 40, a linear solenoid 50, and the like. Then, the linear solenoid 50 is controlled by the control circuit 60. The support base 31 is formed in a disk shape, and the pivot 21 is vertically penetrated through a hole formed in the center, and is fixed to a lower portion of the pivot 21. Pivot 2
1 is connected to the pivot 2 via a link 27.
1 is connected to a drive device (not shown) for controlling the rotation of the motor 1.

The cylinders 32 and 33 are mounted on the support base 31.
The arm head 23 is vertically provided below the lower portion 23b of the base end 23a and below the slits 23f and 23g. On the other hand, a slit 23 is provided at the lower end of the arm head 23.
The upper ends of the links 36 and 37 are rotatably connected to positions below f and 23g, respectively.
Is rotatably connected to the rods 34, 35 of the cylinders 32, 33. In the cylinders 32 and 33, springs 38 and 39 are contracted on the opposite sides of the oil chambers 32a and 33a, respectively.

The support base 31 is provided with small holes 31a and 31b communicating with the oil chambers 32a and 33a of the cylinders 32 and 33, and these small holes 31a and 31b are connected via flexible hoses 43 and 44. Port 4 of cylinder 40
0a, 40b. And the cylinder 40
A linear solenoid 50 is connected to the tip of the rod 41.

The linear solenoid 50 includes a casing 51
The core 52 is housed in the inside so as to be slidable in the axial direction.
Solenoids 53 and 54 and return spring 5 at both ends
5 and 56 are housed, and both ends 52 a, 5
2b can enter and exit the corresponding solenoids 53 and 54. The tip of the rod 41 of the cylinder 4 is fixed to one end 52 a of the core 52 of the linear solenoid 50.

When the solenoids 53 and 54 are deenergized, the core 52 is held at the center by the spring force of the return springs 55 and 56. When the solenoid 53 is energized, the core 52 moves to the left in FIG. When it is energized, it moves to the right. The amount of movement is determined by the solenoid 5
3, and 54 (in proportion to) the drive current. That is, the core 52 moves to a position where the suction force of the solenoid 53 and the spring force of the spring 55 or the suction force of the solenoid 54 and the spring force of the spring 56 are balanced. These solenoids 53 and 54 are connected to a control circuit 60.

The control circuit 60 includes a computer, and includes a rotation direction sensor 61 for detecting the rotation direction of the wiper arm, a rotation angle sensor 62 for detecting the rotation angle of the wiper arm, glass shape data 63, and a signal from the wiper switch 64. The information is taken in and the linear solenoid 50 is controlled. The rotation direction sensor 61 and the rotation angle sensor 62 are, for example, interposed between the link 27 of the driving device for rotating the pivot 21 of the wiper device 20 and the vehicle body, and
7 is detected. Wiper switch 6
Reference numeral 4 denotes a switch for setting intermittent, low-speed, and high-speed operations of the wiping speed of the wiper. In addition, glass shape data 6
3 is stored in the memory of the computer.

The operation will be described below. In FIG. 5, when the piston 42 of the cylinder 40 is at the center position indicated by the dotted line, the same amount of oil is supplied to the oil chambers 32a and 33a of the cylinders 32 and 33, and the protruding lengths of the pistons 34 and 35 are the same. , The arm head 23 becomes horizontal. At this time, the wiper blade is perpendicular to the glass surface, and the error angle becomes zero. When the piston 42 of the cylinder 40 moves rightward (in the direction of arrow C) as shown by the solid line by the linear solenoid 50, the oil in the oil chamber 40c of the cylinder 40 moves to the oil chamber 32a of the cylinder 32 and the oil of the cylinder 33 The oil in the chamber 33a moves to the oil chamber 40d of the cylinder 40.

As a result, the piston 34 of the cylinder 32 moves upward against the spring force of the spring 38, and pushes up the right side of the arm head 23 via the link 36. On the other hand, the piston 35 of the cylinder 33 is pushed down by the spring force of the link 37 and the spring 39 to pull down the left side of the arm head 23. Thereby, the arm head 23 swings in the direction of arrow B.

When the piston 42 of the cylinder 40 moves to the left (in the direction of arrow C ') in the figure, the rod 35 of the cylinder 33 moves upward,
Moves down. As a result, the arm head 23 swings in the direction of arrow B '. That is, the arm head 23 is
It swings with the reciprocation of 0. As a result, the error angle changes. On the other hand, the pivot 21 rotates according to the reciprocating motion of the link 27, and rotates the arm blade along the glass surface. Therefore, the pivot 21 is controlled by the control circuit 60.
By swinging the arm head 23 in accordance with the rotation of, the error angle can be maintained within an ideal range.

When the wiping speed of the wiper arm is low or the operation is intermittent, the swing angle of the arm head 23 is continuously controlled in accordance with the rotation of the pivot 21 so that the error angle can be set in the ideal range over the entire wiping range. To hold. Further, when the wiping speed of the wiper arm is high, the swing angle of the arm head 23 is swung in the wiping direction after the reversal only at the reversing position, and the swing control at the other wiping positions is stopped and fixed at the predetermined swing angle. I do.

That is, as shown in FIG.
Are the inverted positions of the wiper arms, respectively, and the wiper is turned (wiped up) from the position Pa to the position Pa ′ in the direction of the arrow A, or from the position Pa ′ to the position Pa in the direction of the arrow A ′.
Is rotated (wiping down), the wiper blade is moved to the position P set at a position before the position Pa and the position Pa ′.
When the position reaches b and Pb ', the drive mechanism 30 is operated to perform the reversal control of the wiper arm. This is to absorb the time lag (time lag) from the start of the control until the wiper blade is actually swung and the wiper blade is tilted in the reverse direction, and the arm blade is moved to the position Pa or P.
When it reaches b, the wiper blade is brought into a state where the reversal has been completed.

The control circuit 60 includes the wiper switch 6
It is determined whether or not 4 is an intermittent or low-speed position or a high-speed position (step S1 in FIG. 7). If the position is intermittent or low-speed, the rotation direction of the pivot 21 is determined by a signal input from the rotation direction sensor 61. Detect and turn counterclockwise (wipe up)
It is determined whether it is clockwise or wiping (wiping down) (step S2). If it is counterclockwise (direction of arrow A in FIG. 3), the rotation angle sensor 6
The rotation angle of the wiper arm is detected based on the signal input from Step 2 (Step S3).

Next, the control circuit 60 sequentially reads the data of the glass surface shape corresponding to the turning angle (wiping position) of the wiper arm from the memory (step S5), and calculates an error angle corresponding to the turning angle. Then, the calculated error angle is corrected by the glass surface shape data (step S6). The control circuit 60 calculates the displacement of the swing angle of the wiper arm based on the error angle calculated and corrected in step S6, outputs a drive current corresponding to the displacement (step S7), and controls the solenoid of the linear solenoid 50. Energize 53 (FIG. 5). When the solenoid 53 is urged, the core 52 pushes the rod 41 in the direction indicated by the arrow C in the linear solenoid 50 and swings the arm head 23 in the direction indicated by the arrow B. Thereby, the error angle at the time of wiping the wiper is maintained in the ideal range.

The control circuit 60 detects the rotation angle of the wiper based on the signal input from the rotation angle sensor 62 when the wiper arm is clockwise in step S2, that is, when the wiper arm is wiped down (the direction of arrow A 'in FIG. 3) ( Step S4), proceed to step S5, and swing the arm head 23 in the direction of arrow B 'in the same manner as when wiping. Thus, the swing angle of the arm head 23 when the wiper is wiped down is controlled, and the error angle is maintained in an ideal range.

When the control circuit 60 determines in step S1 that the wiper switch 64 is at the high-speed position, the control circuit 60 detects the rotation direction of the pivot 21 based on a signal input from the rotation direction sensor 61, and turns counterclockwise (wipes up). It is determined whether it is clockwise or wiping down (step S10). When counterclockwise (wiping up) (in the direction of arrow A in FIG. 3), the rotation angle of the wiper arm is determined by a signal input from the rotation angle sensor 62. Is detected, and when the arm blade reaches the reversal start position (position Pb ′ in FIG. 6), a blade reversal signal is output (steps S11 and S13), and the linear solenoid 5
0 (FIG. 5) is energized. Thereby, the arm head 23 swings in the wiping direction after the reversal, that is, in the direction of the arrow B ′ in FIG.

As a result, the wiper arm moves to the reversal position P
When the arm blade reaches a ', the arm blade has already finished the reversal, and can follow the wiping operation after the reversal. The control circuit 60 fixes the arm head 23 at a predetermined swing angle, that is, the swing angle of the wiper arm, at a predetermined angle while the wiper arm rotates from the position Pa in FIG. 6 to the reverse position Pb ′.

When the control circuit 60 determines in the step S10 that the rotation is clockwise (wiping down) (in the direction of the arrow A 'in FIG. 3), the control circuit 60 rotates the wiper arm according to a signal input from the rotation angle sensor 62. The angle is detected, and when the arm blade reaches the reversal start position (position Pb in FIG. 6), a blade reversal signal is output (steps S12 and S1).
3), the solenoid 53 of the linear solenoid 50 (FIG. 5)
Energize. Thereby, the arm head 23 swings in the wiping direction after the reversal, that is, in the direction of arrow B in FIG.

As a result, the wiper arm is moved to the reversal position P
When it reaches a, the arm blade has already completed the reversal, and can follow the wiping operation after the reversal.
The control circuit 60 fixes the arm head 23 at a predetermined swing angle, that is, the swing angle of the wiper arm, while the wiper arm rotates from the position Pa ′ in FIG. 6 to the reverse position Pb. In this manner, when the wiper wiping speed is high, the swing angle of the wiper arm is swung in the wiping direction after the inversion only at the inversion position of the wiper arm.

If there is no particular need when the wiping speed of the wiper is other than high speed, fixing the wiper arm eliminates the control deviation of the rotation angle and error angle of the wiper arm and the necessity of a high-performance computer. The control method can be simplified, and a stable wiping operation can be obtained.
In addition, by performing the reversal control at a preset rotation position (Pa ′, Pb in FIG. 6), the reversal behavior is always determined at a fixed position regardless of various disturbance factors such as air resistance and heavy rain during traveling. It can be carried out.

FIG. 8 shows a second embodiment of the drive mechanism 30 for swinging the arm head 23. The hydraulic actuator 70 includes a support base 71, hydraulic cylinders 72 and 73, a linear solenoid valve 80, and a hydraulic pump 87. And the like. The support base 71 is formed in a disk shape like the support base 31 (FIG. 5), and the pivot 21 is vertically penetrated through a hole formed in the center, and is fixed to a lower part of the pivot 21.

The cylinders 72 and 73 are placed on the support base 71,
In addition, the support base 71 is provided with a small hole 71 communicating with the oil chambers 72a, 73a of the cylinders 72, 73.
a, 71b are provided. Also, cylinders 72 and 7
The third oil chambers 72b and 73b have ports 72c and 73c, respectively.
Is provided. On the other hand, at the lower end of the arm head 23, links 76 and 77 are located below the slits 23e and 23f.
Are rotatably connected to the respective upper ends of the rods 74 and 75 of the cylinders 72 and 73, respectively.

The linear solenoid valve 80 has a casing 81 in which a spool 82 is slidably housed, and solenoids 83 and 84 are housed and fixed at both ends.
The two ends can enter and exit these solenoids 83 and 84 with a slight gap. Also, the spool 82
The return springs 85 and 86 are contracted between both end surfaces of the casing 81 and the opposing end surfaces of the casing 81.
The casing 81 is provided with oil chambers 81A to 81C, and the oil chambers 81A to 81C have ports 81a to 81c, respectively.
However, a port 81d is provided between the oil chambers 81A and 81C, and a port 81e is provided between the oil chambers 81C and 81B.

Port 81 of linear solenoid valve 80
c is connected to the discharge side of a hydraulic pump 87 via an oil passage 90, and the ports 81a and 81b are connected to an oil tank 88 via an oil passage 91. The suction side of the hydraulic pump 87 is connected to the oil tank 88. It is connected. Also, port 81d
Are connected to oil chambers 72b and 73a of the cylinders 72 and 73 via oil paths 92 and 93, and the port 81e is connected to oil chambers 72a and 73b of the cylinders 72 and 73 via oil paths 94 and 95. Incidentally, the oil passages 90 to 95 are constituted by flexible hoses. And the solenoids 83, 8
4 is connected to the control circuit 60.

When the solenoids 83 and 84 are both deenergized, the spool 82 has a return spring 85,
86 is held in the neutral position by the spring force of
When the solenoid 3 is energized, it moves to the right in the figure, and when the solenoid 84 is energized, it moves to the left in the figure. Then, the movement amount changes according to the drive current of the solenoids 83 and 84. When the spool 82 is at the neutral position, the oil chamber 81
A, 81B are shut off from oil chamber 81C, and port 81d,
81e is communicated with oil chamber 81C. When the spool 82 moves to the right, the oil chamber 81A is shut off from the oil chamber 81C,
Oil chamber 81B is communicated with oil chamber 81C. When the spool 82 moves to the left, the oil chamber 81B is shut off from the oil chamber 81C as shown, and the oil chamber 81A is communicated with the oil chamber 81C.

When the solenoid 84 of the linear solenoid valve 80 is energized by the control circuit 60 when wiping the wiper blade, the spool 82 moves to the left as shown in the figure. The pressure oil discharged from the hydraulic pump 87 is supplied from the oil passage 90 to the oil chamber 81C, and is passed through the port 81e and the oil passages 94 and 95, so that the oil chambers 72a and
73b. At the same time, the hydraulic oil in the oil chambers 72b and 73a of the cylinders 72 and 73 flows into the oil chamber 81A through the oil passages 92 and 93 and the port 81d, and further the port 81
a, It flows to the oil tank 88 through the oil passage 91. As a result, the rod 74 of the cylinder 72 is pushed up to push up the right side of the arm head 23 via the link 76, and the rod 75 of the cylinder 73 is pushed down to pull down the left side of the arm head 23 via the link 77, and the arm head 23 is pointed by an arrow. It is inclined at a predetermined inclination angle in the B direction.

The control circuit 60 deenergizes the solenoid 84 after the arm head 23 obtains a predetermined inclination. When the solenoid 84 is deenergized, the linear solenoid valve 80 returns the spool 82 to the neutral position by the spring force of the return springs 85 and 86, shuts off the oil chambers 81A and 81B from the oil chamber 81C, and sets the ports 81d and 81e communicates with the oil chamber 81C. As a result, the hydraulic pump 8
The oil pressure generated in the oil chamber 72 is supplied from the oil chamber 81C to the oil chamber
b and 73a are dispersedly added to the oil chambers 72a and 73b through the ports 81e and oil paths 94 and 95, and the same oil pressure is applied to these oil chambers 72a, 72b, 73a and 73b, and the rods 74 and 75 are moved. It is stopped and held at this position. As a result, the arm head 23 is held at the inclination angle.

When the solenoid 83 is energized, the spool 82 moves to the right in the drawing, and the arm head 23 swings in the direction of the arrow B ', contrary to the above, to be controlled to a predetermined inclination angle. . Then, when the solenoid 83 is deenergized after the arm head 23 obtains a predetermined inclination, the spool 82 returns to the neutral position, and the rods 74 and 75 are stopped and held at the positions as described above. As a result, the arm head 23 is held at the inclination angle. In this manner, the arm head 23 is swung to a predetermined inclination angle in accordance with the rotation of the pivot 21 by the movement of the spool 82 in the left-right direction.

FIGS. 9 to 11 show a third embodiment of the drive mechanism 30 of the arm head 23, in which the arm head 23 is swung by a cam. That is, legs (projections) 23m and 23n extending downward are formed at the opening ends of the slits 23f and 23g of the arm head 23 on one side. These legs 23m and 23n have a cylindrical base end 23a.
Are arranged at an interval of about 180 ° in the circumferential direction on the lower end face of the.

On the other hand, a cam 100 rotatably supported between a lower end surface of a base end 23a of the arm head 23 and an upper surface on the vehicle body side and a shaft hole 100c provided at the center of the pivot 21 is provided. Deploy. The cam 100 is an end face cam, the upper surface 100a of which is formed into a curved surface of a predetermined shape corresponding to the glass surface shape, and a gear 100b is engraved on the outer peripheral surface. The arm head 23 has legs 23 m, 2
3n is placed on and in contact with the upper surface 100a of the cam 100.

On the other hand, an actuator, for example,
A step motor 101 is provided with its rotating shaft 101a parallel to the axial direction of the pivot 23, and a gear 102 is fixed to the rotating shaft 101a. The gear 102 is engaged with the gear 100b of the cam 100. With the rotation of the step motor 101, the cam 100
Is rotated, the cam surface 100a swings the arm head 23 via the legs 23m and 23n of the arm head 23. The control circuit 60 controls the step motor 101 in accordance with the rotation of the pivot 21. Thus, the swing angle of the wiper arm is controlled in the same manner as described above.

[0045]

As described above, according to the present invention, when the wiping speed of the wiper arm is high, the wiper arm is located just before the reversal position.
To swing the wiper arm in the wiping direction after reversing,
Smooth reversal can suppress occurrence of chatter. In addition, at the time of high speed, since the wiper arm does not swing, a stable wiping operation can be obtained. Further, there is an effect that the control system can be simplified and a relatively inexpensive configuration can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a wiper device and a glass surface of a vehicle.

FIG. 2 is a front view of a wiper arm of the wiper device of FIG.

FIG. 3 is a perspective view of a main part showing a state in which an arm head of a wiper arm is supported on an upper end of a pivot in the wiper device according to the present invention.

FIG. 4 is a sectional view taken along a line IV-IV in FIG. 3;

FIG. 5 is a cross-sectional view including a driving mechanism of the arm head of FIG. 4;

6 is a diagram showing an operation when the wiping speed of the wiper device of FIG. 5 is high.

FIG. 7 is a flowchart showing a control procedure of the drive mechanism of FIG.

FIG. 8 is a configuration diagram showing a second embodiment of the drive mechanism of FIG. 5;

FIG. 9 is a perspective view showing a main part of a third embodiment of the drive mechanism of FIG. 5;

FIG. 10 is a side view of FIG. 9;

11 is a cross-sectional view taken along a line XI-XI in FIG.

[Explanation of symbols]

 Reference Signs List 20 wiper device 21 pivot 22 flat shaft 23 arm head 26 support mechanism 30, 70 drive mechanism 32, 33, 40, 72, 73 hydraulic cylinder 43, 44, 90-95 oil passage 50 linear solenoid 60 control circuit 61 rotation direction sensor 62 Rotation angle sensor 64 Wiper switch 80 Linear solenoid valve 81 Casing 82 Spool 87 Hydraulic pump 100 Cam 101 Step motor 102 Gear

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yasushi Saeki 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (56) References JP-A-62-116341 (JP, A) JP-A-57-209444 (JP, A) JP-A-4-24148 (JP, A) JP-A-59-162352 (JP, U) JP-A-2-133963 (JP, U) (58) Fields investigated (Int) .Cl. ⁶ , DB name) B60S 1/08 B60S 1/34

Claims (1)

(57) [Claims] 1. A wiper device for wiping a glass surface by rotating a wiper arm having a base end attached to an upper end of a pivot and having a wiper blade at a distal end by the pivot, the upper end of the pivot and the base end of the wiper arm. And a support mechanism for supporting the wiper arm so as to be relatively non-rotatable with the pivot and swingably in the wiping direction, and between the pivot and a base end of the wiper arm,
A drive mechanism for swinging the wiper arm; and a wiping straw for wiping the wiper arm by detecting the wiping speed of the wiper arm and controlling the drive mechanism at high speed.
And a control means for swinging in the wiping direction after the reversal just before the reversing positions at both ends of the wiper device.