JPH03176253A - Vehicle wiper - Google Patents

Abstract

PURPOSE:To reduce striking sounds at the time of reverse of a wiper blade without lowering wiping performance by arranging a stationary projection for bending a link member, and setting the dimension of each portion so as to shift the locking position of an elastic member by a crank member at a point of time of reverse of the blade. CONSTITUTION:When a wiper blade 14 reaches its reverse position, a lever 46 rotating and shifting together with an arm head 20 engages with a stationary projection 54, corresponding to the rotation of the head 20, the lever 46 is rotated and shifted forcibely and relatively to head 20. The lever thereby changes its position relative to a link 42 connected therewith via a balljoint 48 and is bent round the joint 48. A hook arm 32 is therefore pulled in the direction of a pivot shaft 18 by the link 42, a hook 28 is rotated clockwise wound a pin 34, and the locking position of a spring 40 is displaced in the direction of the head 20. Consequently, offset quantity delta of axes X and Y is decreased in comparison with a usual condition, so that pressing force applied to the blade 14 by a spring 40 is decreased to reduce striking sounds at the time of reverse of the blade.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wiper for a vehicle that wipes away raindrops attached to a windshield glass by rotating the wiper back and forth.

[Prior Art and Problems to be Solved by the Invention] A wiper for a vehicle wipes away raindrops attached to the windshield glass surface of a vehicle by pressing the wiper blade against the windshield glass surface and rotating the wiper blade back and forth. At the time of reversal during reciprocating rotation, the load on the blade lip of the wiper blade and the direction of the inertial force suddenly change, resulting in the so-called wiper blade impact noise.

For this reason, conventional measures have been taken for wipers for vehicles, such as attaching the drive mechanism such as the wiper drive motor and operating link to an integrated frame and fixing this frame to the vehicle body via cushion rubber. Ta. However, although such measures alone can make it difficult for the generated wiper blade impact noise to be transmitted into the vehicle interior, the generation of the impact noise itself cannot be sufficiently eliminated.

Therefore, recently, the pressure force of the blade lip of the wiper blade that presses against the windshield glass surface has been reduced only at the time of reversal when the wiper blade rotates back and forth, thereby reducing the impact noise when the wiper blade reverses. A vehicle wiper with variable pressing force has been proposed.

For example, Utility Model Application No. 64-39163, Utility Model Application No. 64-39163,
In the wiper disclosed in Japanese Patent No. 39164, one end of a spring for pressing the wiper blade is locked to a moving lever called a variable lever.

Additionally, a motor for changing the pressing force is placed near the pivot shaft (wiper blade rotation axis), allowing the variable lever to be moved. For this reason, the variable lever is moved by the operation of this motor to change the locking position of the wiper blade pressing spring, thereby reducing the pressing force when the wiper blade is reversed and reducing the impact noise. It has become. Furthermore, as shown in Japanese Patent Application Laid-open No. 55-160637, a wiper has been proposed in which the locking position of a wiper blade pressing spring is changed using a cylinder and a piston instead of a motor.

However, this type of wiper requires a dedicated motor and piston to change the pressing force of the wiper blade, that is, to change the locking position of the spring, so the structure is complex and large. , and also has the disadvantage of high cost.

On the other hand, a vehicle wiper with a variable pressing force that does not use a motor or piston to change the pressing force has also been proposed (
Utility Model Application Publication No. 49-85736, Utility Model Application No. 58-8765
Publication No. 4).

For example, in the wiper disclosed in Japanese Utility Model Application Publication No. 49-85736, one end of a spring for pressing the wiper blade is locked to an eccentric lever called a guide hook. As the wiper blade rotates, the guide hook rotates to change the locking position of the wiper blade pressing spring.

However, this type of wiper is designed to obtain good wiping performance by changing the pressing force during the reciprocating rotation of the wiper blade, and cannot reduce the impact noise when the wiper blade is reversed.

Furthermore, in the wiper disclosed in Japanese Utility Model Application Publication No. 58-87654, one end of the spring for pressing the wiper blade is locked to a hook (movable member), and the hook is configured to reciprocate together with the wiper blade. It has become. Further, a cam that can rotate relative to the pivot shaft is arranged on the pivot shaft. A recess (groove) is formed on the outer peripheral surface of the cam, and the hook comes into contact with and moves along this outer peripheral surface.

For this reason, if a recessed portion of the cam is appropriately formed, the hook that reciprocates with the wiper blade enters the recessed portion and moves up and down to change the locking position of the wiper blade pressing spring, thereby changing the locking position of the wiper blade pressing spring. This is a configuration that can reduce the impact noise by reducing the pressing force when reversing.

However, in this type of wiper, the hook for changing the pressing force of the wiper blade, that is, changing the locking position of the spring, rotates and slides on the outer peripheral surface (recess) of the cam as the wiper blade rotates. Since the hook moves up and down while moving up and down, in order to ensure sufficient vertical movement and smooth movement of the hook, the concave part of the cam must be formed gently (therefore, over a wide range) and accommodate this concave part. It is necessary to increase the amount of rotational sliding (that is, the rotation angle) of the hook, and to gradually and reliably move the hook up and down from a position well in front of the inverted position of the wiper blade. However, in this case, the hook rotates together with the wiper blade, so if the recess of the cam is simply formed to a wide range and the angle of rotation of the hook is increased, the range in which the hook enters the recess, that is, the pressing force of the wiper blade, will decrease. The range covered is wide. Therefore, in such a case, although it is possible to reduce the impact sound when the wiper blade is reversed, there is a problem in that the range in which the wiping performance deteriorates due to the reduction in the pressing force becomes wide.

As described above, the conventional vehicle wiper cannot effectively and sufficiently reduce the impact sound when the wiper blade is reversed, and many problems remain.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a wiper for a vehicle that can effectively reduce the impact sound when the wiper blade is reversed with a simple structure without reducing the wiping performance.

[Means for Solving the Problems] A wiper for a vehicle according to the present invention includes an arm head that is attached to a pivot shaft and reciprocates with the pivot shaft, and one end that is rotatably pivotally connected to the arm head and the other end. A wiper arm has a wiper blade attached to the wiper arm, and one end of the wiper arm is connected to the wiper arm to urge the wiper arm in a direction to rotate about the connecting shaft, and the wiper blade attached to the other end of the wiper arm is moved to the windshield. A wiper for a vehicle, comprising: an elastic member that presses against a shield glass; the wiper is rotatably supported on the arm head so that the other end of the elastic member is locked and the locking position of the elastic member is movable; a crank member which is connected to the crank member and whose other end is arranged so as to be rotatable relative to the pivot shaft, and which rotates the crank member by bending and rotates the crank member with the arm head; a link member that displaces the locking position of the elastic member; and a link member that is fixed to a vehicle body fixed portion around the pivot shaft in correspondence with the link member and that engages with the link member as the arm head rotates. It is characterized by having a fixed protrusion that bends the.

[Function] In the vehicle wiper having the above configuration, the wiper blade attached to the wiper arm is pressed against the windshield glass surface by the pressing force applied by the elastic member, and in this state is reciprocated together with the wiper arm and arm head to remove raindrops. is wiped away.

Here, when the wiper arm and the arm head rotate and reach a predetermined position, the link member rotated together with the arm head engages with the fixed protrusion, and the link member is forcibly bent by the rotation of the arm head. When the link member is bent, the crank member connected to the link member is rotated, and the locking position of the elastic member is displaced. Therefore, the pressing force applied to the wiper blade by the elastic member changes.

Therefore, in order to reduce the pressing force when the wiper blade is reversed, that is, to displace the locking position of the elastic member by the crank member, the fixing protrusion is arranged in correspondence with the reversed position of the wiper arm and the arm head, and each part is By setting the dimensions, it is possible to reduce the impact sound when the wiper blade is reversed.

Furthermore, in this case, only when the wiper blade is reversed, the locking position of the elastic member by the crank member is displaced and the pressing force on the wiper blade is reduced, so the range in which the pressing force on the wiper blade is reduced is minimized. Wiping performance does not deteriorate.

[Embodiment] FIG. 7 shows a wiper 1 for a vehicle according to a first embodiment of the present invention.
0 is shown.

The wiper 10 includes a wiper arm 12 and a wiper blade 14, and the wiper blade 14 reciprocates between a line L1 and a line L2 by reciprocating rotation of the wiper arm 12 to wipe away raindrops attached to a front windshield 16.

FIG. 1 shows a partially transparent perspective view of the vicinity of the rotary wheel of the wiper arm 12. As shown in FIG. Further, FIG. 2 shows a partially transparent plan view of the area around the rotation axis of the wiper arm 12. As shown in FIG.

In the wiper arm 12, an arm head 20 is fixed by a nut 22 to the tip of a pivot shaft 18 serving as a rotation axis. The arm head 20 is formed into a substantially box shape that opens downward, and the side wall portion 2OA is fixed to cover the pivot shaft 18. A retainer 24 is rotatably connected to the tip of the arm head 20 by a shaft 26.

Further, a hook 28 as a crank member is attached to the arm head 20 near the shaft 26. hook 2
8 is a block material bent into an L-shape when viewed from the side to form an arm portion 30 and an arm portion 32, as shown in FIG. However, by a pin 34 fixed to the arm head 20, the arm part 30 is rotatably attached with the arm part 30 facing toward the retainer 24 and the arm part 32 facing upward, and can be rotated around this pin 34. .

A notch portion 3 is formed in the arm portion 30, and a pin 38 is fixed to the distal end of the arm portion 30 with a frame extending across the notch portion 36. One end of a spring 40 as an elastic member is fixed to this pin 38, and further,
The other end of the spring 40 is hooked onto a pin 41 fixed to an axially intermediate portion of the retainer 24. Therefore, the retainer 24 is always connected to the shaft 26 by the spring 40.
The wiper blade 14 receives a rotational force in the counterclockwise direction as shown in FIG.
It is pressed on 6 sides. In this case, by rotating the hook 28 around the pin 34, the locking position of the spring 40 by the pin 38 can be changed, and therefore the tensile force of the spring 40 against the wiper arm 12 (wiper blade 14) (in other words, the The pressing force of the blade 14 against the front windshield 16 can be changed.

On the other hand, one end of the link 42 constituting the link member is attached to a ball joint 44 at the tip of the arm 32 of the hook 28.
are connected via. Furthermore, the other end of the link 42 is connected via a ball joint 48 to one end of a lever 46 that also constitutes a link member. A cylindrical holding portion 50 is formed at the other end of the lever 46, and the pivot shaft 18 is inserted through and connected to the holding portion 50 so as to be relatively rotatable. That is, lever 4
6 is rotatably mounted around the pivot shaft 18 and connected to the hook 28 via a link 42, so that when the hook 28 rotates together with the arm head 20, the link 42 and lever 46 move accordingly. It has become.

Further, when the lever 46 is rotated relative to the arm bed 20, the relative position with the link 42 connected via the ball joint 48 changes, and the lever 46 becomes bent around the ball joint 48.

A base 52 is fixed to the vehicle body outside the pivot shaft 18, and a fixing protrusion 5 is attached to one end of the base 52.
4 is formed protrudingly along the pivot shaft 18. This fixing protrusion 54 corresponds to the lever 46 through a notch 21 formed in the arm head 20, and when the hook 28 rotates together with the arm head 20 and the link 42 and lever 46 are moved accordingly. , can be engaged with the lever 46. The fixed protrusion 54 is connected to the lever 4
6, the lever 46 is forcibly rotated relative to the arm head 20 as the arm head 20+17) rotates.

In this embodiment, as shown in FIG.
, the ball joint 48 and the pivot shaft 18 are arranged on the same axis). Furthermore, the formation position of the fixing protrusion 54 and the dimensions of each part are set so that the fixing protrusion 54 engages with the lever 46 when the wiper blade 14 is reversed.

Next, the operation of this embodiment will be explained.

In the vehicle wiper 1Ω having the above configuration, the wiper blade 14
is pressed against the surface of the front windshield 16 with a pressing force applied by a spring 32.

That is, in a normal state, as shown in FIG. 2, the hook 28, link 42, and lever 46 are all located on the same axis, and as shown in FIG. 3, the pin 41, the pin 38, and Both pins 34 are located on the same axis.

Therefore, the axis X connecting the connecting position (pin 41) between the retainer 24 and the spring 32 and the rotation center (shaft 26) of the retainer 240 and the axis of the spring 40, that is, the pin 41
The retainer 24 always receives a rotational force in the counterclockwise direction in FIG. It is pressed against 16 surfaces of the windshield.

The wiper motor (not shown) operates and the pivot shaft 1
8 rotates, the arm head 20 fixed to the pivot shaft 18 rotates together with the retainer 24, and the wiper blade 14 wipes off raindrops from the surface of the front windshield 16. In this case, the hook 28 attached to the arm head 20 rotates together with the arm head 20, and the link 42 and lever 46 are also moved accordingly.

Here, when the wiper blade 14 reaches the reversed position, the lever 46 that rotates together with the arm head 20 engages with the fixed protrusion 54. When the lever 46 engages with the fixed protrusion 54, the lever 46 is forcibly rotated relative to the arm head 20 as the arm head 20 rotates.

When the lever 46 is rotated relative to the arm head 20, its relative position with the link 42 connected via the ball joint 48 changes, and the lever 46 is bent around the ball joint 48 (see FIGS. 4 and 4). (state shown in FIG. 5).

Therefore, the arm portion 32 (ball joint 44) of the hook 28 is pulled toward the pivot shaft 18 by the link 42, and the hook 28 rotates clockwise in FIG. 3 around the pin 34. Furthermore, for this reason, pin 3 of the hook 28
8, that is, the stop position of the spring 40 is displaced toward the arm head 20 (as shown in FIG. 6). Therefore, the amount of offset δ between the axis X and the axis Y is reduced compared to the normal state shown in FIG. 3. Therefore, the pressing force applied to the wiper blade 14 by the spring 40 is reduced, and the impact noise when the wiper blade is reversed is reduced.

Further, in this case, the hook 28 rotates only when the wiper blade 14 is reversed to the locking position of the spring 40 (pin 3
8) is displaced and the pressing force of the wiper blade 14 is reduced, so the range in which the pressing force of the wiper blade 14 is reduced is minimized and the wiping performance does not deteriorate. Also,
Since the pressing force is reduced when the wiper blade 14 is reversed, dirt and rubber extracts wiped by the wiper blade I4 are prevented from adhering to the front windshield 16, and visibility of the wiper blade reversed position is obstructed. There is no.

Further, as the arm head 20 rotates, the lever 46 engages with the fixed protrusion 54 and is forcibly rotated relative to the arm head 20, so that the relative position with the link 42 is bent, and the hook 28 is bent. Since the arm portion 32 is configured to be pulled in eight directions, the pivot shaft (spring 4) is used to change the pressing force of the wiper blade 14.
There is no need for a dedicated motor, piston, etc. for changing the zero locking position, the structure is simple and compact, and costs are reduced.

In addition, ball joint 44 and ball joint 48
If it is made of a removable type and the link 42 is configured to separate from the hook 28 and the lever 46 when a stress exceeding a predetermined value is applied, it will be possible to prevent this in the event of an abnormality such as when the fixing position of the fixing protrusion 54 is shifted. However, wiper blade 1
It is possible to secure the pressing force during normal reciprocating rotation (in the wiping state) of No. 4, resulting in a fail-safe structure.

Next, a second embodiment of the present invention will be described. Note that parts that are basically the same as those in the first embodiment are given the same reference numerals as in the first embodiment, and their explanations are omitted.

FIG. 8 shows a longitudinal cross-sectional view of the vicinity of the rotation axis of the arm head 62 of the wiper 60 according to the second embodiment. Further, FIG. 9 shows a back view of the area around the rotation axis of this arm head 62.

In the wiper 60, a lever 64 is connected to the end of the link 42 via a ball joint 48 instead of the lever 46 of the first embodiment.

A cylindrical holding portion 66 is formed at the other end of the lever 64 . The holding portion 66 is formed to have a larger diameter than the pivot shaft 18, and is further slidably attached to the inner periphery of the side wall portion 62A of the arm head 62. Further, a circlip 68 is arranged corresponding to the lower end of the holding part 66, and prevents the lever 64 (holding part 66) from being pulled out.

That is, in the first embodiment, the pivot shaft 18 is inserted into the holding portion 50 of the lever 46 so as to be relatively rotatable, and the lever 46 is rotatably attached around the pivot shaft 18. In the wiper 60 in the second embodiment, the holding portion 66 of the lever 64 is slidably assembled to the arm head 62 in advance.

Also in this wiper 60, when the hook 28 rotates together with the arm head 62, the link 42 and the lever 64 are moved accordingly. Furthermore, the wiper blade 14
When the lever 64 reaches the inverted position, the lever 64 that rotates together with the arm head 62 engages with the fixed protrusion 54, and as the arm head 62 rotates, the lever 64 is forcibly rotated relative to the link 42. changes and becomes bent around the ball joint 48. Therefore, the arm portion 32 of the hook 28 is pulled in the direction of the pivot shaft 18 by the link 42 and rotated, and the spring 4
For a hook of 0, the stop position is displaced in the direction of the arm head 62.

Therefore, the offset amount δ between the axis X and the axis Y is reduced, the pressing force applied to the wiper blade 14 by the spring 40 is reduced, and the impact noise when the wiper blade is reversed is reduced.

Also in this wiper 60, when the wiper arm 12 is reversed, the pressing force is reduced, so the wiper blade 1
4 is prevented from adhering to the front windshield 16, and visibility of the wiper blade inverted position is not obstructed. Furthermore, the structure is simple and compact, and costs are reduced.

[Effects of the Invention] As explained above, the vehicle wiper according to the present invention has the effect of being able to effectively reduce the impact sound when the wiper blade is reversed with a simple structure without reducing the wiping performance. ing.

[Brief explanation of drawings]

FIG. 1 is a partially transparent perspective view of the arm head 20 and its surrounding parts in a normal state of a vehicle wiper 10 according to a first embodiment of the present invention, and FIG. 2 is a partially transparent perspective view of the arm head 20 and its surrounding parts in a normal state. FIG. 3 is a schematic vertical cross-sectional view of the arm head 20 and its surroundings taken along the line II[-I in FIG. 2, and FIG. FIG. 5 is a partially transparent perspective view of the arm head 20 and its surroundings in an inverted position, and FIG. 6 is a partially transparent perspective view of the arm head 20 and its surroundings in the inverted position. FIG. FIG. 7 is a schematic longitudinal sectional view of the head 20 and its surrounding parts, FIG. 7 is a schematic overall configuration diagram of the wiper 10 for a vehicle, and FIG. 8 is a second diagram of the present invention.
FIG. 9 is a schematic vertical cross-sectional view of the arm head 62 and its surrounding parts of the vehicle wiper 60 according to the embodiment.
2 and its surrounding parts. FIG. DESCRIPTION OF SYMBOLS 10... Wiper, 12... Wiper arm, 14... Wiper blade, 18... Pivot shaft, 20... Arm head, 24... Retainer, 28... Hook (crank member), 30 .32... Arm part, 40... Spring, 42... Link (link member), 46... Lever (link member), 50... Holding part, 54... Fixing protrusion, 60. 62 ・ 64 ・ 66 ・ ・Wiper, ・Arm head, Renoy holding part.

Claims (1)

[Claims] (1) An arm head attached to a pivot shaft and reciprocatingly rotated together with the pivot shaft; a wiper arm having one end rotatably pivotally connected to the arm head and a wiper blade attached to the other end; A wiper for a vehicle, comprising: an elastic member connected to a wiper arm to urge the wiper arm in a rotational direction around the connecting support shaft, and to press the wiper blade attached to the other end of the wiper arm against a windshield glass. a crank member that locks the other end of the elastic member and is rotatably supported by the arm head and reciprocates with the arm head such that the locking position of the elastic member can be displaced; a link member that is connected to the crank member and whose other end is arranged so as to be rotatable relative to the pivot shaft, and that bends to rotate the crank member and displace the locking position of the elastic member; A fixing protrusion is fixed to a fixed portion of the vehicle body around the shaft in correspondence with the link member, and engages with the link member and bends the link member as the arm head rotates. Wiper for vehicle.