JPH07205763A - Wiper device - Google Patents

Abstract

PURPOSE:To control a swivel angle of a wiper arm in accordance with a temperature of the outside air in the wiper periphery of a wiper device. CONSTITUTION:In a wiper device wiping a glass surface by turning a wiper arm, with the base end mounted on an upper end of a pivot to provide a wiper blade in the point end, by the pivot, the device is provided with a supporting mechanism interposed between the upper end of the pivot 21 and the base end 23 of the wiper arm to support the wiper arm not relatively rotatably to the pivot and further swivelably in a wiping direction. Further, the device is provided with a drive mechanism 30 interposed between the pivot and the base end of the wiper arm to swivel the wiper arm and a control means 60 for largely swiveling the wiper arm at low temperature time by controlling the drive mechanism to further detect a temperature of the outside air in the wiper periphery.

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 Rain and snow adhering to a windshield glass of a vehicle are arranged at a predetermined lower position in front of a windshield glass (hereinafter simply referred to as "glass") 2 of a vehicle body 1 as shown in FIGS. The wiper device 3 is wiped off. The wiper device 3 includes a pivot 4 rotatably arranged on the vehicle body 1, an arm head 5 having a base end fixed to a tip end of the pivot 4, and a base end capable of undulating on a tip end of the arm head 5. A wiper arm 8 composed of a supported retainer 6 and an arm piece 7 whose base end is fixed to the distal end of the retainer 6, and a central portion that is swingable in the distal end of the arm piece 7 and in the axial direction of the arm piece 7. The wiper blade 10 supported via 9 and the spring force of a spring (not shown) provided on the wiper blade 10 and stretched between the tip end of the arm head 5 and the base end of the arm piece 7. The blade rubber 11 pressed against the surface of the glass 2 and the pivot 4 arranged on the vehicle body 1 side
And a drive device (not shown) for rotating the motor in a predetermined range. Then, the wiper arm 8 is rotated by the pivot 4 and the blade rubber 11 wipes off rain, snow and the like adhering to the surface of the glass 2.

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 formed between the wiper blade 10 and the surface of the glass 2
(Hereinafter, referred to as "error angle") will greatly change in accordance with the change in the curvature of the range in which the glass 2 is wiped. In general, the value of the error angle θ is approximately ± 4 ° <θ, where the direction in which the wiper blade 10 wipes from the stop position (counterclockwise) is positive, and the direction in which the wiper blade 10 is wiped (clockwise) is negative.
The tilt of the pivot 4 is set so that it falls within a range of <± 8 °.

When the error angle changes greatly, a very thin water film is formed by water droplets adhering to the glass surface, and when the wiper blade 10 is turned over, the blade rubber 11 cannot be turned over so that the glass surface can be turned over. There is a problem in that a wiping failure such as a phenomenon of so-called chattering occurs due to jumping and jumping.

[0005]

When the outside air temperature and the temperature around the wiper are high, the blade rubber 11 is likely to soften and affect the wiping action. Alternatively, from the viewpoint of combined use with the washer liquid, the elasticity of the blade rubber does not extremely change because the blade rubber 11 is cooled by rain or the washer liquid. As described above, the error angle θ of the wiper blade is ± 4
Since it is set to be in the range of ° <θ <± 8 °, the inclination angle α of the lip portion 11a of the blade rubber 11 with respect to the glass surface is 30 ° to 30 ° in the normal temperature range as shown in FIG.
The range is 50 °, and the best wiping action is obtained.

However, when the temperature is low, the blade rubber 11 is hardened and the required elasticity cannot be obtained, so that the wiping action of the wiper is affected. That is, when the temperature is low, the inclination angle α becomes larger than the required range as shown in FIG. 4 because the blade rubber 11 hardens. For this reason, it is necessary to make the inclination of the wiper blade 10 larger than the normal temperature range. Further, since the blade rubber 11 is hardened, the reversing operation of the blade rubber 11 is unlikely to occur. In particular, when the outside air temperature of the vehicle is lower than 0 °, water drops such as rainwater, snow, and condensation attached to the blade rubber 11 are frozen as shown in FIG. 5, the elasticity of the blade rubber 11 is lost, and the temperature is further lowered. Blade rubber 1 above -35 °
The elasticity of 1 itself is also lost. As a result, the blade rubber 11 is apt to be twisted or chattered, which causes problems such as unwiping of water drops.

The present invention has been made in view of the above-mentioned points, and the outside air temperature is incorporated as information in the wiper control element, and when the temperature is lower than a preset constant temperature, the outside air temperature is taken into consideration in the wiper blade. An object of the present invention is to provide a wiper device configured to control the tilt.

[0008]

In order to achieve the above object, according to the present invention, a wiper arm having a base end attached to an upper end of a pivot and a wiper blade provided at a distal end thereof is rotated by the pivot to rotate the glass surface. In a wiper device for wiping, a support mechanism that is interposed between an upper end of the pivot and a base end of the wiper arm, supports the wiper arm in a relatively non-rotatable manner with respect to the pivot, and swingably in a wiping direction, A drive mechanism interposed between the pivot and the base end of the wiper arm for swinging the wiper arm, and controlling the drive mechanism, detecting the outside air temperature around the wiper, and swinging the wiper arm greatly when the temperature is low. And a control means.

[0009]

The supporting mechanism pivots the base end of the wiper arm on the upper end of the pivot together with the pivot, and swingably supports the wiper arm in the wiping direction. The control means operates in synchronization with the rotation of the pivot to control the wiper to swing, and
When the outside air temperature around the wiper is low, the swing angle is corrected and increased to correct the tilt angle of the lip portion of the blade rubber with respect to the glass surface. As a result, an ideal wiping action can be obtained even at low temperatures.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 6 and 7, the pivot 21 of the wiper device 20 has a shaft 21a having an upper end 21b formed in a spherical shape having a larger diameter than the shaft 21a (hereinafter referred to as "spherical portion 21b"). The continuous portion 21c with the portion 21a is formed in a tapered shape (hereinafter referred to as "tapered portion 21c"). That is, the upper end of the pivot 21 has a ball joint structure. Then, at a position below the taper portion 21c of the pivot 21, a long hole 21 that is flat along the axial direction is formed.
d is the axial direction (Z-axis direction) and the wiper arm axial direction (Y
It is provided so as to be orthogonal to the axial direction (X-axis direction). A flat shaft (hereinafter referred to as "flat shaft") 2 is provided in the long hole 21d.
2 is press-fitted and inserted, and both ends 22a and 22b thereof project on both sides of the pivot 21 by the same length.

On the other hand, the base end 23a of the arm head 23 constituting the wiper arm has a columnar shape, and has a lower portion 23.
b has a slightly larger diameter, and holes 23c to 23e are provided in the axial direction, and the hole 23d has a hemispherical upper portion that opens toward the upper hole 23c and a lower portion that tapers in diameter. And is open facing the lower hole 23e. Holes 23c, 23e
Is larger in diameter than the spherical portion 21b of the pivot 21, and the hole 23d has a concave portion slightly larger than the spherical portion 21b and a tapered portion larger than the taper angle of the tapered portion 21c of the pivot 21, Moreover, the shaft portion 21a is allowed to penetrate with a slight gap. The lower portion of the hole 23e has a larger diameter depending on the outer diameter.

Further, the base end 23a is provided with slits 23f and 23g which are flat in the axial direction along the axial direction at both ends of the diameter near the center of the side wall of the hole 23e. The direction of the diameter in which these slits 23f and 23g are arranged is
The direction is orthogonal 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 to be 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 of the flat shaft 22 are attached.
b is in the slits 23f and 23g in the longitudinal direction (axial direction), respectively.
It is slidably fitted in. Then, the cap 2 is inserted into the 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 at 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 23a 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 a and 22b are supported by the flat shaft 22 fitted in the slits 23f and 23g such that they cannot rotate relative to the pivot 21. The flat shaft 22 has flat both side surfaces of both ends 22a and 22b in sliding contact with both side surfaces of the slits 23f and 23g, respectively, and a mounting position of the pivot 21 to the arm head 23.
The arm head 23 is positioned below (shifted from) the swing center of the pivot 21, that is, the center of the spherical portion 21b of the pivot 21, so that the arm head 23 is positioned in the axial direction of the wiper arm (Y-axis direction). It is prevented from swinging (waviness) in the direction (Z-axis direction). The shaft 22 does not necessarily have to be a flat shaft and may be a round bar.

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

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

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, the 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 the lower positions of f and 23g.
The lower end of the is rotatably connected to the rods 34 and 35 of the cylinders 32 and 33. Then, in the cylinders 32 and 33, springs 38 and 39 are provided on the opposite sides of the oil chambers 32a and 33a, respectively.

The support base 31 is provided with small holes 31a and 31b which communicate 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 of the.

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

The core 52 is held at the center by the spring force of the return springs 55 and 56 when the solenoids 53 and 54 are deenergized, and moves to the left in the figure when the solenoid 53 is energized, and the solenoid 54 When is biased, it moves to the right. The amount of movement is the solenoid 5
It changes (proportionally) according to the driving currents of 3 and 54. That is, the core 52 moves to a position where the attraction force of the solenoid 53 and the spring force of the spring 55 or the attraction force of the solenoid 54 and the spring force of the spring 56 are balanced. These solenoids 53 and 54 are connected to the control circuit 60.

The control circuit 60 has 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, a glass shape data 63, and an outside air temperature sensor 64. Then, the linear solenoid 50 is controlled. The rotation direction sensor 61 and the rotation angle sensor 62 are interposed, for example, between the link 27 of the drive device that rotates the pivot 21 of the wiper device 20 and the vehicle body, and the link 2
The moving direction and the moving amount of 7 are detected. Wiper switch 6
Reference numeral 4 is a switch for setting intermittent, low speed and high speed operation of the wiper wiping speed. Also, the glass shape data 6
3 is stored in the memory of the computer.

The operation will be described below. In FIG. 8, when the piston 42 of the cylinder 40 is at the center position shown 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 become the same length. The arm head 23 becomes horizontal. At this time, the wiper blade becomes vertical to the glass surface and the error angle becomes zero. When the piston 42 of the cylinder 40 moves to the right (in the direction of arrow C) by the linear solenoid 50 as shown by the solid line, 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 moves. 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. This causes the arm head 23 to swing in the direction of arrow B.

When the piston 42 of the cylinder 40 moves leftward (in the direction of arrow C ') in the figure, the rod 35 of the cylinder 33 moves upward, contrary to the above, and the rod 34 of the cylinder 32 moves.
Moves down. As a result, the arm head 23 swings in the arrow B'direction. That is, the arm head 23 is connected to the cylinder 4
It swings with a reciprocating motion of zero. This causes the error angle to change. On the other hand, the pivot 21 rotates according to the reciprocating movement of the link 27, and rotates the arm blade along the glass surface. Therefore, the control circuit 60 causes the pivot 21
The tilt angle of the blade rubber is held at an optimum angle by swinging the arm head 23 in synchronization with the rotation of.

Further, as shown in FIG. 9, the positions Pa, Pa '
Are respectively set to the inverted positions of the wiper arm, and the wiper rotates (wipes) from position Pa to position Pa ′ in the direction of arrow A, or from position Pa ′ to position Pa in the direction of arrow A ′.
When the wiper blade is rotated (wiped down) to the position P and the position P set before the position Pa and the position Pa ′.
When the positions b and Pb ′ are reached, the drive mechanism 30 is operated to start the reversal control of the wiper arm (FIG. 10).
This is to absorb the time lag (time lag) from the start of control to the actual swing of the wiper arm until the wiper blade tilts in the inversion direction. When the arm blade reaches the position Pa or Pb, the wiper blade is detected. Is set to the state in which the inversion is completed (FIG. 11), and the error angle is set to zero. As a result, the inverted positions Pa and Pa '
The swing angle of the wiper arm can be halved and the blade can be easily inverted. Note that, in FIGS. 10 and 11, reference numerals 10 and 11 are attached to the arm blades and the blade rubber as in FIG.

Now, the control circuit 60 includes the rotation direction sensor 6
The rotation direction of the pivot 21 is detected by the signal input from 1 to determine whether it is counterclockwise (wiping up) or clockwise (wiping down) (step S1 in FIG. 12). The rotation angle of the wiper arm is detected by the signal input from the rotation angle sensor 62 (in the direction of arrow A of 6) (step S2). The control circuit 60 sequentially reads the glass surface shape data corresponding to the rotation angle (wiping position) of the wiper arm from the memory (step S4), calculates the error angle corresponding to the rotation angle, and calculates the calculated error angle. Is corrected by the glass surface shape data (step S5).

Next, the control circuit 60 controls the outside air temperature sensor 6
The outside air temperature is detected by the signal input from 4 and it is determined whether the outside air temperature is in the normal temperature / high temperature region or the low temperature region (step S6). If it is in the normal temperature / high temperature region, calculation correction is performed in step S5. The displacement amount of the swing angle of the wiper arm is calculated based on the determined error angle, a drive current corresponding to the displacement amount is output (step S7), and the solenoid 53 (FIG. 8) of the linear solenoid 50 is energized.

When the outside air temperature is in the low temperature range, the error angle correction value corresponding to the outside air temperature is calculated (step S8). This correction value is set, for example, as shown in FIG. 13, and when the outside air temperature falls below 0 °,
Since the water droplets attached to the blade rubber freeze and lose elasticity, the correction value of the error angle is increased by a predetermined amount δ1. The correction value δ1 is, for example, from 0 ° to −3
The correction value is up to 5 °. When the outside air temperature becomes further lower than −35 ° or less, the elasticity of the blade rubber itself is also lost, so the correction value is further increased to δ2 (> δ1). These correction values are set in the map, and values corresponding to the outside air temperature are read out. Then, this correction value δ1 or δ2 is added to the value of the error angle calculated in step S5 to calculate the displacement amount of the corresponding swing angle of the wiper arm, and the drive current corresponding to the displacement amount is output (step S7), the solenoid 53 (FIG. 8) of the linear solenoid 50 is energized.

The linear solenoid 50 has a solenoid 53.
When the core is biased, as shown in FIG.
Is pushed in the direction of arrow C to swing the arm head 23 in the direction of arrow B. As a result, the error angle at the time of wiping the wiper is corrected, and the tilt angle of the lip portion of the blade rubber with respect to the glass surface is 30 ° to 30 ° as shown in FIG.
It is corrected to the range of 50 °. This provides an ideal wiping action.

In step S1, the control circuit 60 detects the rotation angle of the wiper by the signal input from the rotation angle sensor 62 when the wiper arm rotates clockwise, that is, when it is wiped down (direction of arrow A'in FIG. 6). In step S3) and step S4, the arm head 23 is swung in the direction of arrow B'in the same manner as the wiping operation. As a result, the swing angle of the arm head 23 when the wiper is wiped down is controlled, and the error angle is corrected in the same manner as when the wiper is wiped up, and an ideal wiping action is obtained.

FIG. 14 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, 73, a linear solenoid valve 80 and a hydraulic pump 87. Etc. The support base 71 has a disk shape similar to the support base 31 (FIG. 8) and has a pivot 21 formed in a hole formed at the center.
Are vertically penetrated and fixed to the lower part of the pivot 21.

The cylinders 72 and 73 are mounted on the support base 71.
In addition, a small hole 71 is provided vertically below the slits 23e and 23f of the arm head 23 and communicates with the oil chambers 72a and 73a of the cylinders 72 and 73 on the support base 71.
a and 71b are provided. Also, the cylinders 72, 7
The oil chambers 72b and 73b of No. 3 have ports 72c and 73c, respectively.
Is provided. On the other hand, at the lower end of the arm head 23, the links 76, 77 are provided below the slits 23e, 23f.
The upper ends of the links 76 and 77 are rotatably connected, and the lower ends of the links 76 and 77 are rotatably connected to the upper ends of rods 74 and 75 of the cylinders 72 and 73, respectively.

In the linear solenoid valve 80, a spool 82 is slidably housed in a casing 81, and solenoids 83 and 84 are housed and fixed at both ends.
Both ends of 2 can be moved in and out of these solenoids 83 and 84 with a slight gap. Also, the spool 82
Return springs 85 and 86 are provided between the opposite end surfaces of the casing 81 and the opposite end surfaces of the casing 81, respectively.
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 the hydraulic pump 87 via the oil passage 90, and the ports 81a and 81b are connected to the oil tank 88 via the oil passage 91. The suction side of the hydraulic pump 87 is connected to the oil tank 88. It is connected. Also, port 81d
Is connected to the oil chambers 72b and 73a of the cylinders 72 and 73 through the oil passages 92 and 93, and the port 81e is connected to the oil chambers 72a and 73b of the cylinders 72 and 73 through the oil passages 94 and 95. The oil passages 90 to 95 are composed of flexible hoses. And the solenoids 83, 8
4 is connected to the control circuit 60.

The spool 82 has a return spring 85, when the solenoids 83 and 84 are both deenergized.
The solenoid 8 holds the neutral position by the spring force of 86.
When 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. The amount of movement changes according to the drive current of the solenoids 83 and 84. When the spool 82 is in the neutral position, the oil chamber 81
A and 81B are cut off from the oil chamber 81C, and ports 81d,
81e communicates with the oil chamber 81C. When the spool 82 moves to the right, the oil chamber 81A is shut off from the oil chamber 81C,
The oil chamber 81B communicates with the oil chamber 81C. When the spool 82 moves to the left, the oil chamber 81B is cut off from the oil chamber 81C and the oil chamber 81A communicates with the oil chamber 81C as shown in the figure.

When the control circuit 60 urges the solenoid 84 of the linear solenoid valve 80 when the wiper blade is being wiped, the spool 82 moves to the left as shown in the figure. The pressure oil discharged from the hydraulic pump 8 is supplied from the oil passage 90 to the oil chamber 81C, and the port 81e and the oil passage 9 are provided.
Oil chambers 72a, 7 of cylinders 72, 73 through 4, 95
3b. At the same time, the hydraulic oil in the oil chambers 72b and 73a of the cylinders 72 and 73 is transferred to the oil passages 92 and 93 and the port 8 respectively.
It flows into the oil chamber 81A through 1d, and the port 81
a to the oil tank 88 through the oil passage 91. As a result, the rod 74 of the cylinder 72 is pushed up and the right side of the arm head 23 is pushed up via the link 76, the rod 75 of the cylinder 73 is pushed down and the left side of the arm head 23 is pulled down via the link 77, and the arm head 23 is moved by the arrow. Tilt to a predetermined angle in the B direction.

The control circuit 60 deactivates 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 the port 81d, 81e communicates with the oil chamber 81C. As a result, the hydraulic pump 8
The oil pressure generated in No. 7 is transmitted from the oil chamber 81C through the port 81d and the oil passages 92, 93 to the oil chamber 72 of the cylinders 72, 73.
b, 73a are distributed and added to the oil chambers 72a, 73b through the port 81e and the oil passages 94, 95. The oil pressures of the same pressure are applied to these oil chambers 72a, 72b, 73a, 73b, and the rods 74, 75 are It is stopped and held at that position. As a result, the arm head 23 is held at the tilt angle.

When the solenoid 83 is energized, the spool 82 moves to the right in the figure, and the arm head 23 swings in the direction of arrow B'in the opposite direction to the above, and is controlled to a predetermined tilt 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 that position as described above. As a result, the arm head 23 is held at the tilt angle. In this way, the arm head 23 is swung at a predetermined inclination angle according to the rotation of the pivot 21 by the movement of the spool 82 in the left-right direction.

FIGS. 15 to 17 show a third embodiment of the drive mechanism 30 for the arm head 23, in which the arm head 23 is rocked by a cam. That is,
Legs (projections) 23m and 23n extending downward are formed at the open ends of the slits 23f and 23g of the arm head 23, respectively. These legs 23m and 23n have a cylindrical base end 23.
They are arranged on the lower end surface of a at intervals of approximately 180 ° in the circumferential direction.

On the other hand, the cam 100 is rotatably supported between the lower end surface of the base end 23a of the arm head 23 and the upper surface on the vehicle body side and through a shaft hole 100c provided at the center of the pivot 21. Deploy. The cam 100 is an end face cam, and the upper surface 100a 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. Then, the arm head 23 includes the legs 23m, 2
3n is placed on the upper surface 100a of the cam 100 and is in contact therewith.

On the other hand, an actuator such as
The step motor 101 is arranged with its rotary shaft 101a parallel to the axial direction of the pivot 23, and a gear 102 is fixed to the rotary shaft 101a. The gear 102 meshes with the gear 100b of the cam 100. The cam 100 rotates as the step motor 101 rotates.
When 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 according to the rotation of the pivot 21. Thereby, the swing angle of the wiper arm is controlled in the same manner as described above.

[0042]

As described above, according to the present invention, in the wiper error angle control or the blade reversal control, the control corresponding to the outside air temperature can be performed, and the adverse effect of the outside air temperature on the wiper can be eliminated. It is possible to prevent the twist of the blade rubber, the chatter of the wiper, and the like, and it is possible to obtain an ideal wiping action.

[Brief description of 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 diagram showing a state of a blade rubber at the time of wiping when the outside air temperature is high.

FIG. 4 is a diagram showing a state of a blade rubber at the time of wiping when the outside air temperature is low.

FIG. 5 is a diagram showing a state of a blade rubber at the time of wiping when the outside air temperature is 0 ° or less.

FIG. 6 is a perspective view of essential parts showing a state in which an arm head of a wiper arm is supported on an upper end of a pivot in a wiper device according to the present invention.

7 is a sectional view taken along line VII-VII in FIG.

8 is a sectional view including a drive mechanism of the arm head of FIG.

9 is an explanatory diagram of a reversing operation at the time of wiping of the wiper device of FIG.

10 is a sectional view taken along line XX in FIG.

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

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

FIG. 13 is a graph showing an example of a correction value of an error angle with respect to the outside air temperature.

FIG. 14 is a configuration diagram showing a second embodiment of the drive mechanism shown in FIG.

FIG. 15 is a perspective view of a main portion showing a third embodiment of the drive mechanism shown in FIG.

16 is a side view of FIG.

17 is a sectional view taken along line XVII-XVII in FIG.

[Explanation of symbols]

 20 Wiper device 21 Pivot 22 Flat shaft 23 Arm head 26 Support mechanism 30, 70 Drive mechanism 32, 33, 40 Hydraulic cylinder 50 Linear solenoid 60 Control circuit 61 Rotation direction sensor 62 Rotation angle sensor 64 Outside air temperature sensor 80 Linear solenoid valve 81 Casing 82 Spool 87 Hydraulic Pump 100 Cam 101 Step Motor 102 Gear

Front page continued (72) Inventor Wataru Goto No. 1 Nakashinri, Hashime-cho, Okazaki-shi, Aichi Mitsubishi Motors Engineering Co., Ltd. Okazaki Plant (72) Inventor Yasushi Saiki 5-3-8 Shiba, Minato-ku, Tokyo Within Mitsubishi Motors Corporation

Claims (1)

[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 a wiper blade provided at a front end, the upper end of the pivot and the base end of the wiper arm. And a support mechanism that supports the wiper arm so that the wiper arm cannot rotate relative to the pivot and can swing in the wiping direction, and is interposed between the pivot and the base end of the wiper arm,
A wiper device comprising: a drive mechanism that swings the wiper arm; and a control unit that controls the drive mechanism, detects the outside air temperature around the wiper, and swings the wiper arm greatly when the temperature is low. .