JPH07156756A - Wiper for vehicle - Google Patents

Abstract

PURPOSE:To provide a wiper for a vehicle where the rising phenomenon of the wiper is prevented to secure the excellent wiping performance, the overrun is prevented irrespective of the traveling speed of the vehicle and the wiper operating speed to surely keep the prescribed wiping range with a simple structure at a low cost. CONSTITUTION:A hinge pin 44 connecting an arm head 12 to a retainer 14 is tilted by turning a movable head part 18 and a movable retainer part 20 by a head motor 48. The head motor 48 is operated according to the traveling speed or the like of a vehicle. This constitution generates the down force when the wiper is operated to prevent the rise, and reduces the wiping angle of a wiper blade attributed to the change of the depression angle. Thus, the prescribed wiping range can be surely kept by setting the angle of reduction corresponding to the overrun quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wiper for wiping a windshield glass of an automobile.

[0002]

2. Description of the Related Art In a vehicle wiper for wiping a windshield glass of an automobile, a wiper arm having an arm head attached to a pivot shaft reciprocates within a predetermined range by the rotation of the pivot shaft to wipe raindrops and the like. However, when the vehicle is traveling at high speed, a so-called wiper lifting phenomenon may occur due to the lift force acting on the wiper blade, which is a cause of poor wiper wiping.

For this reason, conventionally, a so-called "twisting" is employed in which an arm hinge for connecting an arm head and a retainer is provided so as to be inclined with respect to a plane orthogonal to a pivot shaft, and a depletion direction of a wiper blade is inclined with respect to a windshield glass. "Head head type" wipers and wipers provided with fins for preventing floating when the wiper is activated have been proposed. With this type of wiper, a blade pressing force (down force) can be generated on the wiper blade, and thus the wiper can be prevented from rising.

By the way, in a vehicle wiper, the wiper arm and blade are reversed beyond a predetermined wiping range (reciprocating rotation limit) due to the backlash of the wiper operating mechanism (link) and the inertial force of the wiper arm and blade. The run phenomenon sometimes occurred. This overrun phenomenon of the wiper is likely to occur particularly when the wiper operates at high speed or when the vehicle runs at high speed.

In this case, the so-called "twisting head type" wiper in which the arm hinge is simply tilted as described above cannot eliminate the overrun phenomenon, and is provided with a fin for preventing lifting. The wiper also has a drawback that the overrun phenomenon is further promoted due to the drag force acting on the fin when the wiper arm and blade reach the upper reversal position.

Further, in this case, in order to eliminate the above-mentioned overrun phenomenon, the maximum swing amount of the wiper arm and blade is estimated in advance to set the swing angle of the link for driving the wiper, or the swing angle of the link is set to the wiper angle. Measures such as switching (variable) according to the operating speed of the vehicle and the traveling speed of the vehicle are taken, but in the normal wiper operating state and the traveling state of the vehicle, the wiping range decreases and the cause of poor visibility However, the mechanism itself is complicated and large, and the cost is high. In any case, it is not a fundamental solution, and measures for this have been earnestly desired.

[0007]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention not only prevents the wiper floating phenomenon and ensures a good wiping performance, but also wiper arms and blades regardless of the vehicle running speed and wiper operating speed. It is an object of the present invention to obtain a vehicle wiper that can prevent the overrun of the vehicle and reliably maintain a predetermined wiping range, and that can be realized by a wiper arm alone without using a link.

[0008]

A vehicle wiper according to the present invention comprises an arm head attached to a pivot shaft and an arm hinge attached to an arm piece for holding a wiper blade and orthogonal to the pivot shaft. A retainer rotatably connected to the arm head, wherein the arm head and the retainer are reciprocally rotated together with a wiper blade within a predetermined range by rotation of the pivot shaft. Inclination is provided independently of the arm head and the retainer with respect to a plane orthogonal to the pivot shaft, and the arm hinge is inclined at a predetermined angle based on at least one of the traveling speed of the vehicle and the wiper operating speed. A hinge angle changing means is provided. To have.

[0009]

In the vehicle wiper having the above structure, the arm head and the retainer reciprocally rotate together with the wiper blade by the rotation of the pivot shaft to wipe away raindrops and the like.

Here, for example, when the vehicle is running at high speed or the wiper is running at high speed, the hinge angle changing means tilts the arm hinge with respect to a plane orthogonal to the pivot shaft.

As a result, a part of the drag force (wind pressure) acting on the wiper blade or the like acts as a blade pressing force that presses the wiper blade against the surface to be wiped (windshield glass surface) (down force is generated), and this This prevents the wiper from rising.

Furthermore, when the arm hinge is tilted with respect to the plane orthogonal to the pivot shaft, the depletion angle changes due to the reciprocating rotation of the wiper blade (the actual rotation angle of the pivot shaft is changed. If not), the wiping angle of the wiper blade relative to the surface to be wiped is reduced. Therefore, by considering the amount of overrun of the wiper arm and blade in this state (corresponding the amount of decrease in the wiping angle relative to the surface to be wiped and the amount of overrun), the inclination angle of the arm hinge is set, A predetermined wiping range of the wiper arm and blade can be maintained, and the overrun phenomenon is reliably prevented regardless of the traveling speed of the vehicle and the wiper operating speed.

As described above, with the wiper according to the present invention, not only the phenomenon of lifting of the wiper can be prevented and good wiping performance can be secured, but also the overrunning of the wiper arm and blade can be performed regardless of the running speed of the vehicle and the wiper operating speed. It is possible to prevent and reliably maintain a predetermined wiping range. Further, since the arm hinge is tilted based on the traveling speed of the vehicle or the wiper operating speed, the wiping range in the normal vehicle traveling state or the wiper operating state is changed to the wiping range in the high speed vehicle traveling state or the wiper operating state. It does not need to be set narrower than that of, and does not cause deterioration of visibility. Further, since the arm hinge is simply tilted, the structure is simple and small in size and can be realized at low cost.

The blade pressing force (down force) and the reduction amount of the wiping angle relative to the surface to be wiped (overrun amount to be eliminated) are both determined by the change amount of the tilt angle and depletion angle of the arm hinge. However, since the amount of change in the depletion angle and the dimensions of the wiper arm and blade differ depending on the vehicle model, the required tilt angle of the arm hinge can be set appropriately for each vehicle model (depending on the required performance). Good.

[0015]

1 is a plan sectional view showing the structure of a main part of a vehicle wiper 10 according to a first embodiment of the present invention.
2 shows a side sectional view of the configuration of the main part of the wiper 10, and FIG. 3 shows a sectional view taken along line 3-3 of FIG.

The wiper 10 includes an arm head 12 and a retainer 14. Further, the arm head 12 is composed of a fixed head part 16 and a movable head part 18, and the retainer 14 is composed of a movable retainer part 20 and a fixed retainer part 22.

An attachment hole 24 is formed in the fixed head portion 16 of the arm head 12 and is attached to a pivot shaft (not shown). Further, in the fixed head portion 16, one end of the shaft 26 is fixed by a screw 28, and a bearing 30 is arranged around the shaft 26. The movable head portion 18 is fixed to the fixed head portion via the bearing 30. It is connected to 16. Shaft 2
The other end of 6 penetrates the movable head portion 18, and is held by the movable head portion 18 via a slide bush 32.
Therefore, the movable head portion 18 is rotatable around the shaft 26 with respect to the fixed head portion 16.

On the other hand, the fixed retainer portion 22 of the retainer 14
An arm piece 34 for holding a wiper blade (not shown) is attached to the. Further, in the fixed retainer portion 22, one end of the shaft 36 is fixed by a screw 38, and a bearing 40 is arranged around the shaft 36. The movable retainer portion 20 is fixed to the fixed retainer portion via the bearing 40. It is connected to 22. The other end of the shaft 36 penetrates the movable retainer portion 20, and the movable retainer portion 2 is inserted through the sliding bush 42.
It is held at 0. Therefore, the movable retainer portion 20
Is rotatable about the shaft 36 with respect to the fixed retainer portion 22.

The arm head 12 (the fixed head portion 16 and the movable head portion 18) and the retainer 14 (the movable retainer portion 20 and the fixed retainer portion 22) having the above-mentioned configurations are respectively the tips of the movable head portion 18 and the movable retainer portion 20. But,
The shafts 26 and 36 are connected by a pair of hinge pins 44 as arm hinges, and the shaft 26 and the shaft 36 are connected by a flexible joint 46.
Here, the hinge pin 44 is provided orthogonal to the pivot shaft, the shaft 26, and the shaft 36.

Thus, the retainer 14 is secured by the hinge pin 44 (arm hinge) orthogonal to the pivot shaft.
The (movable retainer portion 20 and the fixed retainer portion 22) is the arm head 12 (the fixed head portion 16 and the movable head portion 1).
8) rotatably connected to the hinge pin 44
The (movable head portion 18 and the movable retainer portion 20) is fixed around the shaft 26 and the shaft 36 (in other words, with respect to a surface orthogonal to the pivot shaft).
The fixed retainer portion 22 and the fixed retainer portion 22 can be inclined independently.

Further, the fixed head portion 16 of the arm head 12 has a head motor 4 as a hinge angle changing means.
8 is built in together with the encoder 50. The rotary shaft 52 of the head motor 48 projects into the movable head portion 18, and the pinion 54 is fixed. This pinion 54
Mesh with a gear portion 56 formed on the movable head portion 18. Therefore, when the head motor 48 rotates, the gear portion 56 receives the driving force, and the movable head portion 1
8, the hinge pin 44 and the movable retainer portion 20 are inclined (rotated) with respect to the fixed head portion 16 and the fixed retainer portion 22 by a predetermined angle.

As shown in FIG. 4, the head motor 48 includes a driver 60 in a controller 58 which constitutes a hinge angle changing means.
The encoder 50 is also connected to the control device 58 to detect the rotational operating angle of the head motor 48. Further, a wiper motor 64 is connected to the control device 58 via a driver 62, the wiper motor 64 can be operated, and it is detected whether or not the rotational position of the wiper motor 64, that is, whether the wiper 10 has reached the downward reversal position. it can. Further, a vehicle speed sensor 66 is connected to the control device 58 so that the traveling speed of the vehicle can be detected. The controller 58 controls the head motor 48 based on the detection signals from the wiper motor 64, the encoder 50, and the vehicle speed sensor 66 in accordance with a control program described later in detail.

Further, one end of an arm spring 68 is connected to the back side of the movable head portion 18, and the other end of the arm spring 68 is connected to the fixed retainer portion 22. Thereby, a predetermined arm pressure is applied to the wiper blade.

Next, the operation of this embodiment will be described. In the vehicle wiper 10 having the above configuration, the wiper motor 64 operates and the pivot shaft rotates, whereby the arm head 12 (the fixed head portion 16 and the movable head portion 18) and the retainer 14 are rotated.
(The movable retainer portion 20 and the fixed retainer portion 22) reciprocally rotate together with the wiper blade to wipe off raindrops and the like.

FIG. 5 shows a control flowchart when the wiper is operating. In the wiper control routine, it is first determined in step 200 whether the wiper switch has been turned on. If the wiper switch has been turned on, the head motor 48 is turned on in step 202.
The rotation position of is initialized. Then, step 204
At, it is determined whether or not the traveling speed of the vehicle has changed based on the detection signal from the vehicle speed sensor 66, and if there is a change, the routine proceeds to step 206. On the other hand, if there is no change in the vehicle speed in step 204, the process proceeds to step 208, it is determined whether or not the operating speed of the wiper motor 64 has changed, and if there is a change, the process proceeds to step 206.

In step 206, the current head motor 4
8 rotation information is compared with the existing rotation information, and then in step 210, the rotation direction and rotation amount of the head motor 48 are set. That is, when the vehicle speed and the wiper operating speed increase, the head motor 48
Is set to rotate in the forward direction by a predetermined amount, and when the vehicle speed or the operating speed of the wiper becomes slow, the head motor 48 is set to rotate in the reverse direction by a predetermined amount.

Next, at step 212, it is judged whether the rotational position of the wiper motor 64, that is, the wiper 10 has reached the lower reversal position. When the wiper 10 reaches the downward reversal position, the process proceeds to step 214 and step 210
The head motor 48 is operated in accordance with the rotation direction and the rotation amount of the head motor 48 set in. As a result, the pinion 54 of the head motor 48 rotates, the gear portion 56 receives the driving force, and the movable head portion 18 receives the hinge pin 4.
4 and the movable retainer portion 20, the hinge pin 44 and the fixed head portion 16 and the fixed retainer portion 22 are rotated.
(Movable head portion 18 and movable retainer portion 20) forms a predetermined angle (tilt angle θ) with respect to a plane orthogonal to the pivot shaft.
_h ) inclined.

After that, the routine proceeds to step 216, where it is judged whether or not the wiper switch is turned off. Further, if there is no change in the traveling speed of the vehicle in step 204 and there is no change in the operating speed of the wiper motor 64 in step 208, the process proceeds to step 216. Step two
If the wiper switch is not turned off in 16, the process returns to step 204 and the above control is repeated, turned off and the process ends.

In this way, when the set running speed of the vehicle or the operating speed of the wiper motor 64 changes (for example, when the vehicle is in a high-speed running state or when the wiper is in a high-speed operating state), the hinge pin is used. 44 is tilted at a predetermined angle (tilt angle θ _h ) with respect to a plane orthogonal to the pivot shaft.

[0030] Thus, when the hinge pin 44 as described above is the inclination angle theta _h inclined with respect to a plane perpendicular to the pivot shaft, as shown in FIG. 6, a portion of the drag (wind pressure) F acting on the wiper blade wiper It acts as a blade pressing force F _{2 that} presses the blade against the surface to be wiped (down force is generated), which prevents the wiper arm and blade from rising.

Further, in a normal case, the depletion angle θ of the vehicle wiper increases as the wiper moves from the lower reversal position to the upper reversal position as shown in FIG.

[0032] Thus, when the hinge pin 44 as described above is the inclination angle theta _h inclined with respect to a plane perpendicular to the pivot shaft, to a change in the depletion angle theta with the movement of the upper turning position from the lower turning position of the wiper blade Due to this (even if the actual rotation angle of the pivot shaft is not changed), the retainer 14 (the movable retainer portion 20 and the fixed retainer portion 22) is gradually rotated around the hinge pin 44 together with the wiper blade while the retainer 14 is being rotated. 1
4, that is, the wiping angle of the wiper blade relative to the surface to be wiped is reduced.

Here, FIG. 8 shows a schematic principle diagram in this case. In FIG. 8, line L: the lower reversal position of the portion from the hinge pin 44 to the tip of the wiper blade line L ₁ : the upper reversal position of the portion of the portion from the hinge pin 44 to the tip of the wiper blade without tilting line L ₂ : Upward reversal position when the hinge pin 44 in the portion from the hinge pin 44 to the tip of the wiper blade is tilted at an inclination angle θ _h Dimension L: Length dimension from the hinge pin 44 to the tip of the wiper blade θ _D : At the upper reversal position Between the depletion angle θ and the depletion angle θ at the lower reversal position (change amount) A: As a reduction dimension of the wiping range relative to the surface to be wiped at the tip of the wiper blade, A ≒ L ・ sin θ _D・ sin It is represented by θ _h .

Therefore, for example, L = 650 mm, θ
_If θ _h = 15 ° is set for the vehicle wiper with _D = 10 °, A ≈ 29 mm, and even if the actual rotation angle of the pivot shaft is not changed, relative to the wiped surface at the tip of the wiper blade. This means that the wiping angle has been reduced.

Therefore, the inclination angle of the hinge pin 44 is set in consideration of the overrun amount of the wiper arm and blade in this state (corresponding to the amount of decrease in the wiping angle relative to the surface to be wiped and the amount of overrun). As a result, a predetermined wiping range of the wiper arm and blade can be maintained, and the overrun phenomenon can be reliably prevented regardless of the traveling speed of the vehicle and the wiper operating speed. For example, in the example described above, the reduction dimension A of the wiping range relative to the surface to be wiped at the tip of the wiper blade is about 2
Since it is 9 mm, it is possible to offset the wiper overrun amount of about 25 mm when the vehicle is traveling at 200 km, for example.

As described above, in the wiper 10 according to this embodiment, not only the wiper lifting phenomenon can be prevented and the good wiping performance can be ensured, but also the wiper arm and blade overrun regardless of the running speed and the wiper operating speed of the vehicle. A run can be prevented and a predetermined wiping range can be reliably maintained. Further, since the hinge pin 44 is inclined based on the traveling speed of the vehicle or the wiper operating speed, the wiping range in the normal vehicle traveling state or the wiper operating state is changed to the wiping range in the high speed vehicle traveling state or the wiper operating state. It does not need to be set narrower than that of, and does not cause deterioration of visibility. Furthermore, since the hinge pin 44 is tilted only by the operation of the head motor 48,
It has a simple and compact structure and can be realized at low cost.

The blade pressing force (down force) and the amount of reduction in the wiping angle relative to the surface to be wiped (overrun amount to be eliminated) are both the inclination angle of the hinge pin 44 (the operating angle of the head motor 48). ) And the amount of change in the depletion angle, but the amount of change in the depletion angle and the dimensions of the wiper arm and blade etc. are different for each vehicle type, so the required tilt angle of the hinge pin 44 is different for each vehicle type (required performance. It may be set as appropriate).

Next, another embodiment of the present invention will be described. The parts that are basically the same as those in the first embodiment have the first
The same reference numerals as in the embodiment are given and the description thereof is omitted.

FIG. 9 is a plan sectional view showing the structure of the main part of the vehicle wiper 70 according to the second embodiment of the present invention.

The wiper 70 has an arm head 72 and a retainer 74. Further, the arm head 72 is composed of a fixed head portion 76 and a movable head portion 78, and the retainer 74 is composed of a movable retainer portion 80 and a fixed retainer portion 82.

The fixed head portion 76 of the arm head 72 and the movable head portion 78 are connected by a shaft 84, and the movable head portion 78 is rotatable around the shaft 84 with respect to the fixed head portion 76. On the other hand, retainer 7
The fixed retainer portion 82 and the movable retainer portion 80 of No. 4 are connected by a shaft 86, and the movable retainer portion 80
Is rotatable about the shaft 86 with respect to the fixed retainer portion 82.

Further, the arm head 72 (the fixed head portion 76 and the movable head portion 78) and the retainer 74 (the movable retainer portion 80 and the fixed retainer portion 82) are such that the tips of the movable head portion 78 and the movable retainer portion 80 are They are connected by a hinge pin 88 as an arm hinge. As a result, the retainer 74 (movable retainer portion 80 and fixed retainer portion 82) can be rotated by the arm head 72 (fixed head portion 76 and movable head portion 78) by the hinge pin 88 (arm hinge) orthogonal to the pivot shaft. There is.

The fixed head portion 7 of the arm head 72
6 includes a head motor 48 as a hinge angle changing means.
Is built in together with the encoder 50, and the movable head portion 78 is tilted (rotated) with respect to the fixed head portion 76 together with the hinge pin 88 and the movable retainer portion 80 by rotating the head motor 48.

Further, the movable retainer portion 8 of the retainer 74
In 0, an auxiliary motor 90 is built in together with an encoder 92. The rotation shaft 94 of the auxiliary motor 90 projects into the fixed retainer portion 82, and the pinion 96 is fixed like the head motor 48. The pinion 96 meshes with a gear portion 98 formed on the fixed retainer portion 82. Therefore, when the auxiliary motor 90 rotates, the gear portion 98 receives the driving force, and the movable retainer portion 80 and the fixed retainer portion 82 are relatively inclined (rotated) by a predetermined angle.
This is the configuration. The rotation of the auxiliary motor 90 is controlled independently of the head motor 48.

With the above structure, the hinge pin 88 (movable head portion 78 and movable retainer portion 80) is attached to the shaft 8
4 and the shaft 86 (in other words, with respect to the plane orthogonal to the pivot shaft) can be independently inclined with respect to the fixed head portion 76, and further, the fixed retainer portion 82 can be independently inclined. When the fixed retainer portion 82 is inclined, the attack angle of the blade rubber changes.

Next, the operation of this embodiment will be described. In the vehicle wiper 70 having the above configuration, when the set traveling speed of the vehicle or the operating speed of the wiper motor 64 changes (for example, when the vehicle is in the high-speed traveling state or when the wiper is in the high-speed operating state). Similarly to the above-described first embodiment, the head motor 48 operates and the movable head portion 78 and the movable retainer portion 80 (that is, the hinge pin 88) are inclined at a predetermined angle with respect to the plane orthogonal to the pivot shaft. In this case, the auxiliary motor 90 is the head motor 48.
In synchronism with the above, the fixed retainer portion 82 and the arm piece 34 (in other words, the wiper blade) are kept in a constant inclination angle so that the attack angle of the blade rubber does not change.

As a result, a part of the drag force (wind pressure) acting on the wiper blade acts as a blade pressing force that presses the wiper blade against the surface to be wiped (down force is generated), and lifting of the wiper arm and blade is prevented. It

Further, when the hinge pin 88 is inclined with respect to a plane orthogonal to the pivot shaft, the depletion angle changes due to the movement of the wiper blade from the lower reversal position to the upper reversal position (actually, the pivot shaft is (While the rotation angle of the retainer is not changed), the retainer 74 (the movable retainer portion 80 and the fixed retainer portion 82) is gradually rotated around the hinge pin 88 together with the wiper blade, while the retainer 74, that is, the surface to be wiped of the wiper blade. The wiping angle relative to is reduced.

Therefore, the inclination angle of the hinge pin 88 is set in consideration of the overrun amount of the wiper arm and blade in this state (corresponding to the decrease amount of the wiping angle relative to the surface to be wiped and the overrun amount). As a result, a predetermined wiping range of the wiper arm and blade can be maintained, and the overrun phenomenon can be reliably prevented regardless of the traveling speed of the vehicle and the wiper operating speed.

Furthermore, the wiper 70 according to the second embodiment.
Then, since the movable retainer portion 80 and the fixed retainer portion 82 can be relatively inclined (rotated) by operating the auxiliary motor 90 independently, the auxiliary motor 90 should be synchronized with the head motor 48. If the hinge pin 88 is operated independently, the fixed retainer portion 82 can be further inclined with respect to the fixed head portion 76 while the hinge pin 88 is kept inclined. Therefore, in this case, the wiper blade is inclined, and the attack angle of the blade rubber is changed.

Therefore, for example, when the attack angle of the wiper cannot be set properly due to the structure of the vehicle, or the attack angle of the wiper cannot be properly set due to the thermal deformation of the blade rubber, or the attack angle is changed from an appropriate value. When it changes, the auxiliary motor 90 is operated independently of the head motor 48 to move the fixed retainer portion 8
By inclining 2, the attack angle of the blade rubber can be optimally set or maintained.

Further, in the wiper 70, a vibration pickup capable of detecting the chatter amplitude when a so-called "chatter phenomenon" of the wiper arm and blade occurs is provided in the arm piece 34 or the like, and the auxiliary motor 90 is operated based on the detection signal. When the fixed retainer portion 82 is tilted by operating independently of the head motor 48, the attack angle of the blade rubber can be set to an optimum state in which the “chatter phenomenon” does not occur.

Thus, the wiper 7 according to the second embodiment.
Even at 0, not only the wiper lifting phenomenon can be prevented and good wiping performance can be secured, but also the wiper arm & blade overrun is prevented regardless of the traveling speed and wiper operating speed of the vehicle to ensure a predetermined wiping range. Can be maintained. Further, since the hinge pin 88 is inclined based on the traveling speed of the vehicle or the wiper operating speed, the wiping range in the normal vehicle traveling state or the wiper operating state is changed to the wiping range in the high speed vehicle traveling state or the wiper operating state. It does not need to be set narrower than that of, and does not cause deterioration of visibility. In addition, simply the head motor 48
Also, since the hinge pin 88 is tilted by the operation of the auxiliary motor 90, the structure is simple and small, and the cost can be reduced.

FIG. 10 is a plan sectional view showing the structure of the main part of the vehicle wiper 100 according to the third embodiment of the present invention.

The wiper 100 includes an arm head 102 and a retainer 104. A cylindrical head hinge 106 is attached to the arm head 102 via a bearing 108, and the head hinge 106 is rotatable about the longitudinal axis of the arm head 102. On the other hand, the retainer 104 has a cylindrical retainer hinge 110.
Are attached via bearings 112, and the retainer hinge 110 is rotatable about the longitudinal axis of the retainer 104. The arm head 102 and the retainer 104 are joined by a ball joint 114, and the head hinge 106 and the retainer hinge 1 are joined together.
10 is a pair of hinge pins 11 as arm hinges.
6 are connected.

As a result, the retainer 104 is rotatable with respect to the arm head 102 by the hinge pin 116 that is orthogonal to the pivot shaft (however, since the degree of freedom of rotation about the arm longitudinal direction is restricted by the pin 119, the piece 34 of the piece 34). The angle is kept constant) and the hinge pin 116 (head hinge 106 and retainer hinge 110) causes the arm head 102 and retainer 104 to move.
The configuration is such that it can be tilted independently of the arm head 102 and the retainer 104 around the longitudinal axis of the above (in other words, with respect to the plane orthogonal to the pivot shaft).

Further, the arm head 102 is provided with a head motor 48 serving as a hinge angle changing means.
Built in with 0. Rotating shaft 5 of head motor 48
Reference numeral 2 projects to the side of the head hinge 106, and the pinion 54 is fixed. The pinion 54 meshes with a gear portion 118 formed on the peripheral surface of the head hinge 106. Therefore, as the head motor 48 rotates, the gear portion 118 receives the driving force, and the head hinge 1
06 is tilted (rotated) by a predetermined angle with respect to the arm head 102 and the retainer 104 together with the hinge pin 116 and the retainer hinge 110.

Next, the operation of this embodiment will be described. In the vehicle wiper 100 having the above configuration, when the set traveling speed of the vehicle or the operating speed of the wiper motor 64 changes (for example,
When the vehicle is in a high-speed running state or when the wiper is in a high-speed operating state), the head motor 48 operates to operate the head hinge 106 and the retainer, as in the first and second embodiments described above. The hinge 110 (that is, the hinge pin 116) is inclined at a predetermined angle with respect to a plane orthogonal to the pivot shaft.

As a result, a part of the drag force (wind pressure) acting on the wiper blade acts as a blade pressing force that presses the wiper blade against the surface to be wiped (down force is generated), and lifting of the wiper arm and blade is prevented. It

When the hinge pin 116 is inclined with respect to the plane orthogonal to the pivot shaft, the depletion angle changes due to the movement of the wiper blade from the lower reversal position to the upper reversal position (actually, the pivot shaft is (While the rotation angle is not changed), the retainer 104 is gradually rotated around the hinge pin 116 together with the wiper blade, while the relative wiping angle of the retainer 104 or the wiper blade with respect to the surface to be wiped is reduced.

Therefore, the inclination angle of the hinge pin 116 is set in consideration of the overrun amount of the wiper arm and blade in this state (corresponding to the decrease amount of the wiping angle relative to the surface to be wiped and the overrun amount). As a result, a predetermined wiping range of the wiper arm and blade can be maintained, and the overrun phenomenon can be reliably prevented regardless of the traveling speed of the vehicle and the wiper operating speed.

Thus, the wiper 1 according to the third embodiment
In 00, not only the wiper floating phenomenon can be prevented and good wiping performance can be secured, but also the overrun of the wiper arm and blade can be prevented regardless of the traveling speed and the wiper operating speed of the vehicle to ensure a predetermined wiping range. Can be maintained. Further, since the hinge pin 116 is inclined based on the traveling speed or the wiper operating speed of the vehicle, the wiping range in the normal vehicle traveling state or the wiper operating state is changed to the wiping range in the high speed vehicle traveling state or the wiper operating state. It does not need to be set narrower than that of, and does not cause deterioration of visibility. Further, the hinge pin 116 (head hinge 1
06 and the retainer hinge 110) are inclined, so that the structure is simple and small, and the cost can be reduced.

[0063]

As described above, the vehicle wiper according to the present invention can not only prevent the wiper lifting phenomenon and ensure good wiping performance, but also wiper arms and blades regardless of the running speed and wiper operating speed of the vehicle. Has an excellent effect that it is possible to reliably maintain a predetermined wiping range by preventing the overrun and to realize this with a simple structure at low cost.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a configuration of a main part of a vehicle wiper according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a configuration of a main part of the vehicle wiper according to the first exemplary embodiment of the present invention.

FIG. 3 is a diagram of a vehicle wiper according to a first embodiment of the present invention.
3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a block diagram showing a configuration of a vehicle wiper control device according to the first exemplary embodiment of the present invention.

FIG. 5 is a control flowchart of the vehicle wiper according to the first embodiment of the present invention.

FIG. 6 is a schematic view showing a downforce generation state in a state where the hinge pin of the vehicle wiper according to the first exemplary embodiment of the present invention is inclined.

FIG. 7 is a diagram showing how the depletion angle changes with respect to the wiping position of the vehicle wiper.

FIG. 8 is a schematic principle diagram showing changes in depletion angle and wiping angle when a hinge pin of a vehicle wiper is tilted.

FIG. 9 is a plan sectional view showing a configuration of a main part of a vehicle wiper according to a second embodiment of the present invention.

FIG. 10 is a plan sectional view showing a configuration of a main part of a vehicle wiper according to a third embodiment of the present invention.

[Explanation of symbols]

 10 wiper 12 arm head 14 retainer 16 fixed head portion 18 movable head portion 20 movable retainer portion 22 fixed retainer portion 34 arm piece 44 hinge pin (arm hinge) 48 head motor (hinge angle changing means) 58 control device (hinge angle changing means) 70 wiper 72 arm head 74 retainer 76 fixed head part 78 movable head part 80 movable retainer part 82 fixed retainer part 88 hinge pin (arm hinge) 90 auxiliary motor (hinge angle changing means) 100 wiper 102 arm head 104 retainer 106 head hinge 110 retainer Hinge 116 Hinge pin (arm hinge)

Claims (1)

[Claims] 1. An arm head attached to a pivot shaft, and a retainer to which an arm piece for holding a wiper blade is attached and which is rotatably connected to the arm head by an arm hinge orthogonal to the pivot shaft. A wiper for a vehicle in which the arm head and the retainer reciprocally rotate together with a wiper blade within a predetermined range by rotation of the pivot shaft, the arm hinge with respect to a surface orthogonal to the pivot shaft. And a hinge angle changing unit that tilts independently of the retainer and tilts the arm hinge by a predetermined angle based on at least one of the traveling speed and the wiper operating speed of the vehicle. A wiper for a vehicle.