JPH03114955A - Wiper - Google Patents

Abstract

PURPOSE:To reduce the resistance of a cylindrical part during the reciprocation of a wiper by forming a first cam member into a cylinder eccentric to a first pin around a first pin, and pivotally supporting a sub-lever by the cylindrical outer circumferential surface of the first cam member. CONSTITUTION:When a worm 23 is rotated by a motor 22, a worm wheel 21 is rotated around a pin 2, and the connecting point A between a cam member 24 and a sub-lever 25 is moved to B or C. The movement of the connecting point A displaces the center A' of a first cam member 26 to B' or C' against the center of a pin 16 by the sub-lever 25. The sub-lever 25 is pivotally supported by the cylinder part outer circumferential surface of the first cam member 26 to provide a larger contact surface. Hence, the sub-lever 25 can be lightly oscillated following the working force from a wiper driving mechanism.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a wiper with a variable wiping angle, and more particularly, to a wiper with a variable wiping angle. The present invention relates to a wiper having a wiper.

(Conventional technology) It is known to make the wiping angle of a wiper variable.

The basic principle of making the wiping angle of the wiper variable is shown in FIG. 35. A crankshaft 102 is attached to an eccentric shaft 101 rotated by a motor so as to be fixed or rotatable, and a crank lever 103 is attached to this crankshaft 102. Secure one end. Connect the other end of the crank lever 103 to the rod 10
4, and this rod 104 is pivoted to the free end of an arm 107 fixed to a pin 105. The pin lO5 is rotatably supported by a stationary member and is connected to the wiper arm 106.
to carry.

When the center of the crankshaft 102 is placed at the 0 mark with respect to the center of the eccentric shaft 101, the other end of the crank lever 103 rotates in a circle indicated by ◎ with the center of the eccentric shaft 101 as the rotation center, and The arm 107 rotates within a predetermined angle range around the pin 105, and when storing a wiper blade (not shown), the fixed relationship between the eccentric shaft 101 and the crankshaft 102 is released, and the arm 107 rotates around the center of the eccentric shaft 101. , shift the center of the crankshaft 102 to the Δ mark. As a result, the other end of the crank lever 103 moves toward the center of the eccentric shaft 101, as shown by the mark Δ1, and the arm 107 is also displaced to the retracted position, as shown by the mark Δ2. In this way, by displacing the crankshaft 102 relative to the eccentric shaft 101, a storage position further below the lower inversion position can be secured.

(Problems to be Solved by the Invention) The wiper arm 106 is rotated to wipe the windshield, for example, not only when the vehicle is stopped, but also when the vehicle is running at low or high speeds. In such wiping while the vehicle is running, wind force acts on the wiper arm 106, and the wiper arm is moved to a position beyond a predetermined position, thereby increasing the wiping angle. Such overrun of the wiper arm causes the wiper blade to collide with the pillar, damaging the wiper blade and sometimes even driving it over the pillar and rendering it inoperable.

Further, the wind force acting on the wiper arm 106
7. Since a large force is amplified and acts on the motor via the crank lever 103 and rod 104, a large worm that can counter this reaction force is required, and the overall device becomes large.

For the reasons mentioned above, conventional wiper drive mechanisms have become large in size, and there is also a great risk of damage to the wiper arm.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention basically provides a sub-lever in parallel with a main lever that supports a second pin that supports a wiper arm, and a main lever that supports a second pin that supports a wiper arm. The lever and the sub-lever are connected via a cam member around the first and second pins, and the second cam member is rotated to move the center of the first cam member relative to the center of the second pin. Adopt a movable configuration.

(Operation) When the second cam member is rotated, its rotation angle is transmitted to the first cam member via the sub-lever, displacing the center of the first cam member with respect to the center of the first pin. . That is,
The center of the first cam member is displaced relative to the center of the second pin. Since the force from the drive device acts on this first cam member, the point of application of the force can be changed and the rotation angle of the wiper arm can be adjusted.

This principle will be explained using FIG. 1. The main lever 9 is provided with first and second pins 16.2;
Attach the sub-lever 25 via the cam members 26 and 24. When the center of the connection point between the second cam member 24 and the sub-lever 25 is at the center, the point of action on the first cam member 26 (the center of the first cam member) is at the position A'. In this case, the wiper allows wide-angle wiping. When the second cam member 24 is rotated to move the center of the connection point to B, the point of action moves to B', allowing the wiper to be retracted. Also, the center of the connection point is C
When the wiper is moved to C', the point of action is displaced to C', allowing the wiper to wipe at an included angle.

In the present invention, since it is only necessary to rotate the second cam member,
The motor may be small, and the device can be made smaller.

The acting force from the drive device acting on the center of the first cam member 26 attempts to rotate the second cam member 24 around the second pin 2, but due to the worm fixed to the small motor, Since this rotation is prevented, the narrow angle, wide angle, and retracted positions are maintained correctly. Furthermore, by synchronizing the direction of the acting force from the drive device and the direction of the driving force of the small motor, it is possible to further downsize the small motor.

In the present invention, the sub-lever is supported on the outer circumferential surface of the cylindrical portion of the first cam member and the contact area is large, so that the sub-lever can be easily swung by following the acting force from the wiper drive mechanism. .

Furthermore, since the dimension from the connecting point of the sub-lever and the first cam member to the first pin can be increased, the reaction force to the worm wheel that drives the second cam member can be reduced.

(Example) The basic configuration of a wiper is shown using FIGS. 2 and 3. A wiper blade 5. attached to the tip of a wiper arm 3.4 fixed to a second wiper shaft or second pin 1.2.
6 is stored in the storage position (A') and moves to the downward inverted position of B' when in use.

C' is the top reversal position at wide angle, and D' is the top reversal position at narrow angle. The wiper is operated at a wide angle (CB' - C') only when the vehicle speed is low or at a low speed, and at other times the wiper is operated at a narrow angle (B' - D'). That is, when the vehicle speed is high and when the wiper is operating at high speed at a low vehicle speed, the wiper is set in the narrow angle operating range. Incidentally, the lower reversal position (B') may be used as the wiper storage position. 7 indicates a pillar. The second pin 1.2 is fixed to the main lever 8.9, and the two main levers 8.9 are connected by means of a connecting link 12 and a shaft 10.11. A first pin 16 is fixed to the main lever 9 on the negative side, and a link 13 is connected to a connecting portion 15 pivotally supported by the first pin 16, and the link 13 is connected to a wiper motor. The end 14 of the link 13 is moved in a circular motion 17 by the wiper motor. Operation of the wiper motor causes the link 13 to reciprocate and swing the main lever 8.9 about the second pin 1.2. Since the second pin 1.2 is fixed to the main lever 8.9, the pin 1.2 also pivots and the wiper arm 3.
4 is reciprocated within a certain operating range. The wiper operating range variable mechanism will be explained below. Although this mechanism is incorporated in one main lever 9, it may be added to the other main lever 8, or only one main lever 8.9 may be provided.

Reference will now be made to FIGS. 4 and 5. The second pin 2 fixed to the main lever 9 is rotatably held by a stationary member 19 on the vehicle body side via a bush 18. Stationary member 19
A worm wheel 21 is pivotally supported via a bush 20, and a worm 23 is engaged with the wheel 21, which is fixed to the output shaft of a motor 22.

The worm wheel 21 rotatably holds the sub-lever 25 via the second cam member 24, and the other end of the sub-lever 25 is rotatably held by the first cam member 26 supported by the first pin 16. hold it.

When the worm 23 is rotated by the motor 22, the worm wheel 21 rotates around the pin 2, and the cam member 24
and move the connecting point (A) of the sub-lever 25 to B or C. The movement of the connecting point (A) is controlled by the sub-lever 25.
The center A' of the cam member 26 of B is relative to the center of the pin 16.
' or C'. As explained in connection with FIG. 1, this allows the wiper to have a wide, retracted or narrow range of operation by selecting the A', B' or C' positions.

In this example, the point of action of the link 13 on the connecting portion 15 and the pin 16
The distance between the center of the pin 16 and the center of the sub-lever 25 is
Since the distance between the link 13 and the connecting point with the first cam member 26 is considerably small, the acting force from the link 13 is reduced to a small force and transmitted to the sub-lever 25, so that it does not adversely affect the meshing part of the wheel 21. .

A second embodiment is shown in FIGS. 6 and 7. A second pin 2 is fixed to the main lever 9, and a second cam member 24 is rotatably attached to the shaft of a stationary member 19 eccentric from the center of the pin 2. That is, the pin 2, the axis of the stationary member 19, and the center of the cam member 24 are eccentric from each other. A worm wheel 21 is integrally provided on a cam member 24, and a worm 23 is engaged with the wheel 21. A first pin 16 is installed on the main lever 9, a first cam member 26 is rotatably mounted around the pin, and the link 13 is supported by the connecting portion 15 on the upper part of the cam member 26. pin 16, first cam member 26
The centers of the connecting portions 15 are eccentric to each other. The rotation of the wheel 21 is transmitted to the first cam member 26 via the second cam member 24 eccentric to the wheel 21 and the sub-lever 25, and the cam member 26 rotates around the pin 16, causing the action from the link 13 to be transmitted to the first cam member 26. In other words, the wiper is selected to be in the wide-angle, retracted or narrow-angle operating range, as described above.

In this example, since the reaction force toward the center of the first cam member 26 in response to the input from the link 13 to the point of action of the connecting portion 15 can be reduced, the sub-lever 25 can be made thinner, and furthermore, the thickness of the sub-lever 25 can be reduced. The load on the meshing part is reduced. Further, as is clear from FIGS. 31-34, the positions of A, C, and C in the figures can be selected with sufficient distances from each other.

Further, since the dimension between the input point from the sub-lever 25 and the center of the pin 16 can be made large, the output of the motor 22 may be small.

8 and 9 show a third embodiment. In this example, the structure around pin 2 is the same as the structure around pin 2 shown in FIG. 6, and the structure around pin 16 is the same as the structure around pin 2 shown in FIG. Pin 1 shown in the figure
The configuration around 6 is the same. A position sensor 27 detects the rotation angle of the second cam member 24 based on an electric signal from a contact placed on the upper surface of the second cam member 24.

This sensor can be applied to any embodiment.

FIG. 10.11 shows a fourth embodiment. In this example, the configuration around the second pin 2 is the same as the configuration around the pin 2 in FIG. Since the configuration around the pin 16 is the same as that shown in FIG. 6, the explanation thereof will be omitted here with reference to FIG.

Although not particularly shown, the structure around the second pin 2 shown in FIG. 4 and the structure around the first pin 16 shown in FIG. 6 may be combined.

A fifth embodiment will be described with reference to FIGS. 12-17. The motor 22, worm 23, and worm wheel 21 are housed in a space created by an upper case 100 and a lower case 101, and both cases 100 and 101 are fastened together with a plurality of screws 102 and fixed to a stationary member 19. Ru.・A bushing 20 is attached to the outer peripheral surface of the cylindrical part of the stationary member 190.
via the worm wheel 21 and the second cam member 24
, the movable portion 103 of the position sensor 27 is pivotally supported.

A pair of convex portions 104 extending upward from the inner circumferential side of the worm wheel 21 enters into a concave portion 105 of the second cam member 24, thereby coupling the two so that they can rotate together. The second cam member 24 and the position sensor 27 are coupled by engagement between the recess 106 and the projection 107. Also, position sensor 27
A locking portion 108 extending upward from the movable portion 103 of
It is rotatably supported by a fixed part 109 on the stationary member 19 side, and maintains the correct relative positional relationship between the terminals of the fixed part 109 of the position sensor 27 and the terminals of the movable part 103, and prevents loosening or coming out in the axial direction. prevent it.

Second cam member 24 and movable part 103 of position sensor 27
A plate 110 is arranged between the plate 110 and
receives the axial force from the second cam member 24 and the sub-plate 25 and protects the position sensor 27. The axial position of the sub-lever 25 is between the plate 110 and the second
The seat of the cam member 24 is determined by the surface 111. The plate 110 itself is fixed to the stationary member 19 by screws 112. The play 1-110 and the downward facing side wall 113 of the stationary member 19 surround the position sensor 27 and protect it from external water and dust.

Excessive rotation of the worm wheel 21 must be prevented since it adversely affects the position control of the wiper blade. As shown in FIG. 14, the case 110 is provided with a holding part 115 having contact parts 114 on both sides of the rubber material. , abuts on the abutting portion 114 to prevent the worm wheel 21 from over-rotating.

In order to prevent the operating noise of the motor 22 from being transmitted into the vehicle interior, elastic support members 117, 118.1 are provided as shown in FIG.
As a result, there is no transmission of motor operating noise to the case. The elastic support member 119 supports the motor shaft 120
The motor shaft 120 is supported by the case 100.101 via the bear link 121. Thrust washers 122 and 123 are used to prevent the motor shaft 120 from rattling in the thrust direction, and to reduce operating noise,
It is preferable to combine the thrust washers 122 and 123 with an elastic material.

A sixth embodiment will be described with reference to FIGS. 18-24. 1st
Components that are the same as those in the -5 embodiment are denoted by the same reference numerals, and their explanations will be omitted. In this example, sub-plate 25 has pin 16.
It is connected to the surrounding second sub-plate 124 by a pin 125 and is supported by the pin 15 . A spacer 126 is disposed between the main lever 9 and the second sub-player 124, and the spacer 124 is pivotally supported by the pin 16. The convex portion 127 of the spacer 126 is connected to the hole 12B of the sub-plate 124.
The spacer 126 and the sub-plate 124 are integrally connected to each other.

A seventh embodiment is shown in FIGS. 24 and 25. A rectangular elongated hole 28 is bored at one end of the main lever 9, and the first pin 16 is inserted into the elongated hole 28. When the wheel 21 concentric with the pin 2 rotates, the cam member 24 rotates around the pin 2,
The center of the cam member 24 moves toward or away from the center of the pin 16 to select the wide-angle, retracted, or narrow-angle operating range of the wiper. In the example shown in FIG. 4-11, the first cam member 26 rotates around the pin 16, and the cam member 26 rotates around the pin 16.
However, in this example, the pin 16 moves along the long length 28 and selects the operating position, so the long length 28
will function as the second cam member.

An eighth embodiment is shown in FIGS. 26 and 27. The configuration around the pin 2 is the same as the configuration around the pin 2 in FIG. 6, and the configuration around the pin 16 is the same as the configuration in FIG. 24. The centers of the pin 2, the wheel 21, and the cam member 24 are eccentric to each other, and the pin 16 moves the elongate 28 in response to the movement of the sub-lever 25 to take the wiper operating position. For the movement of each part, refer to Figure 6.24.

A ninth embodiment is shown in FIGS. 28 and 29. In this example, pin 2
The surroundings are the same as the configuration shown in Figure 4, and pin 1
The structure around 6 is the same as that shown in FIG. 24. In this example as well, the pin 16 is moved within the elongated part 28 via the sub-lever 25 in accordance with the rotation of the wheel 2 to select the position of the wiper. For the function of each part, refer to Fig. 4.24.

The example shown in Figures 24-29 is manufactured by Chodai 28.
Since assembly errors can be absorbed, smooth movement of each part can be guaranteed.

FIG. 30 shows a tenth embodiment. In this example, the configuration around the pin 2 is such that the elongated size 28 in FIG. , and also in the longitudinal direction of the elongated part 28, so that the position of the wiper can be reliably selected.

The area around the pin 2 may have the configuration shown in FIG. 6 or 4.

In this example, in addition to the pin movement in the longitudinal direction, the pin can be moved in the left-right direction, making it easier to select the position of the wiper.

For example, selection of the operating position of the wiper in the example of FIG. 6 will be explained using FIGS. 31-34.

FIG. 31 shows the relationship among the main lever 9, sub-lever 25, and link 13 in the wiper storage position. In the wiper retracted position, the center of the second cam member 24 is at the position A with respect to the center of the wheel 21.

As shown in FIG. 31, when the wiper drive device operates when the center of the cam member 24 is at position A, the main lever 9 rotates about the pin 2 in the right direction in the drawing. At this time, the main lever 9 moves to the lower reversal position, which is set as the included angle. In the return stroke of the main lever 9, while the main lever 9 moves to the left in the paper of FIGS. 31 and 32 and reaches the lower reverse position, the center of the cam member 24 is changed from A to the opening by the motor 22, and the opening position is changed. The main lever 9 is operated to the lower reverse position.

When the vehicle speed is high or the wiper operating speed is high (see Fig. 33), the cam is moved by the motor 22 from the state shown in Fig. 32 before the main lever 9 reaches the downward reverse position on the right side of the page. The center of member 24 is moved from the mouth to the eight. As a result, the wiper blade becomes B'-D in Fig. 2.
' Operated reciprocally between '.

When the vehicle speed is low and the wiper operation speed is low (34th
(see figure), the wiper blade is reciprocated between B' and c' in FIG. 2 while the main lever 9 remains in the state shown in FIG. 32.

In this type of wiper blade operation, when the main lever 9 is operated from the retracted position, the lower included angle reversal position is always selected, so even if the wiper is suddenly moved while the car is running at high speed, the wide angle operating range is maintained. Safe wiper operation is possible without the wiper reciprocating.

Apart from the above-mentioned example, the following operation may also be used. When the wiper is taken out from the storage position, the center of the cam member 24 moves from A to the opening, and the wiper lower inverted position (see FIG. 32) is selected.Then, as shown in FIG. Move the center from the mouth to the 8th position to obtain the wiper's included angle operating range. The rotation of the motor 17 rotates the link 13 within the wiper angle operating range. When the center of the cam member 24 is returned from the 8th position to the 8th position and the motor 17 is rotated, the wiper can be rotated in a wide angle operating range as shown in FIG. This example operation is effective in preventing the wiper from entering the wide-angle operating position directly from the retracted position.

(Effects) In the present invention, the motor for the variable wiper operating range device is made small and is supported by a stationary member, so that the main lever and the sub-lever can make necessary movements lightly and easily. Since the wheel is arranged around the pin for supporting the wiper arm, the entire device can be made smaller.Furthermore, compared to the case where the motor is supported by the main lever, the motor can be fixed to a stationary member without having to attach it to the motor. It is extremely safe as there is no disconnection due to the movement of the harness. The wind force acting on the wiper can be immediately stopped by the worm that meshes with the wheel, so there is no wind flow from the wiper and no collision with the pillar.In addition, the wiring for the position sensor can be installed on a stationary member. This may also increase safety. Since it is only necessary to assemble all the parts to the stationary member one after another, work efficiency and assembly accuracy are increased, and a noise-free wiper can be provided.

Further, since the sub-lever and the first cam member are connected by a cylindrical portion having a large contact area, resistance at this portion during reciprocating movement of the wiper is small. Furthermore, since the dimension from the connecting point of the sub-lever and the first cam member to the first pin can be increased, the reaction force to the wheel gear can be reduced, and the wheel gear can be made of resin.

[Brief explanation of drawings]

Fig. 1 is a principle diagram of the wiper operating range variable mechanism, Fig. 2 is a diagram showing the wiper operating range, Fig. 3 is a diagram showing the wiper link mechanism, Fig. 4 is a sectional view of an example of the variable mechanism, and Fig. 4 is a diagram showing the wiper operating range. 5 is a plan view thereof, FIG. 6 is a sectional view of another example, FIG. 7 is a plan view thereof, FIG. 8 is a sectional view of the third embodiment, FIG. 9 is a plan view thereof, and FIG. 10 is a sectional view of the third embodiment. A sectional view of the fourth embodiment, FIG. 11 is a plan view thereof, FIG. 12 is a sectional view of the fifth embodiment, FIG. 13 is a sectional view of the worm wheel portion thereof, and FIG. 14 is a plan view of the worm portion. , FIG. 15 is a front view of the motor section, FIG. 16 is a plan view of the fifth embodiment, FIG. 17 is a plan view of the motor case, FIG. 18 is a sectional view of the sixth embodiment, and FIG. The figure is a sectional view of the worm wheel, FIG. 20 is a plan view of the worm wheel, FIG. 21 is a plan view of the sixth embodiment, and FIG. 22 is a sectional view taken from arrow A-A in FIG. Figure 23 is a cross-sectional view taken from arrow B-B in Figure 21;
The figure is a sectional view of the seventh embodiment, FIG. 25 is a plan view thereof, and FIG.
6 is a sectional view of the eighth embodiment, FIG. 27 is a plan view thereof, FIG. 28 is a sectional view of the ninth embodiment, and FIG. 29 is a plan view thereof.
FIG. 30 is a plan view of the twelfth embodiment, FIGS. 31-34 are diagrams illustrating the selection of the wiper operating position, and FIG. 35 is a diagram showing the operation of the conventional example. In the diagram: 1.2...second bin, 3.4...wiper arm,
5.6... Wiper blade, 8.9... Main lever 12.13... Link, 16... First bin, 1
7... Wiper motor, 19... Stationary member, 21...
- Worm wheel, 22... Motor, 24... Second cam member, 25... Sub lever, 26... First
Cam member, 28...long hole.

Claims (1)

[Claims] A first pin connected to the drive mechanism, a main lever supported by the first pin, and a second pin connected to the main lever.
a pin, a wiper arm fixed to the second pin, and a drive mechanism rotates the main lever around the second pin to reciprocate the wiper arm, and the wiper arm is disposed around the first and second pins. The first cam member and the second cam member are connected by a sub-lever, and the center of the first cam member can be moved relative to the center of the first pin by rotating the second cam member. In the wiper, the first cam member is
A wiper characterized in that the pin has a cylindrical shape eccentric to the first pin, and the sub-lever is supported on the cylindrical outer peripheral surface of the first cam member.