JPS6230535Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wiper device for wiping the window surfaces of automobiles, etc., in which the set load of the wiper blade that presses against the window surface (wiping surface) is variable. .

As shown in FIG. 1, a commonly used wiper device includes a wiper shaft 3 that is supported by a pivot 1 fixed to a vehicle body 2 and rotates back and forth, and an arm head 4 whose one end is fixed to the wiper shaft 3. An arm 5 whose one end is supported on the other end side of the arm head 4 via a pivot pin 6, a wiper blade 7 attached to the other end of the arm 5, and a structure between the arm head 4 and the arm 5. The wiper shaft 3 is rotated reciprocally by a drive device (not shown) while the wiper blade 7 is brought into moderate pressure contact with the wiping surface 10 by the tension spring 11, etc. The wiper blade 7 is configured to swing back and forth to wipe the wiping surface 10.

However, in such a wiper device, when the vehicle speed or the relative wind speed changes, the airflow velocity hitting the wiper blade 7 that is in pressure contact with the wiping surface 10 changes, and the lift acting on the blade 7 also changes, so that the wiping surface of the wiper blade 7 changes. This has the drawback that the pressing pressure against the wiper blade 10 changes, and the wiping performance of the wiper blade 7 varies depending on the driving condition of the automobile. Here, the distance from the pivot pin 6 to the wiper blade 7 is L, the set load of the wiper blade 7 is P, and
If the tension of the tension spring 11 is T, and the length of the perpendicular line drawn from the pivot pin 6 to the tension spring 11 is l, then the pivot pin 6 of the arm 5
The turning moment M toward the vehicle body 2 around
It is expressed as M=L×P and M=l×T. Therefore, by changing the tension T and the moment M, the set weight P of the wiper blade 7 can be varied since the distance L is constant.

Therefore, conventionally, an actuator (not shown) is connected to the tension spring 11, and the spring 11 is expanded and contracted by the output of the actuator to change the tension T and the set load P of the wiper blade 7. A wiper device is known in which the pressing pressure of the blade 7 against the wiping surface 10 is approximately constant regardless of the driving state of the automobile.

However, in this device, the actuator directly expands and contracts the tension spring 11, and the set load P of the wiper blade 7 is adjusted according to the tension T.
Since the actuator is variable, the actuator requires a large force, and has the disadvantage of being large and heavy.

The present invention does not have the above-mentioned drawbacks, and the set load of the wiper blade can be varied by a simple operation, so that when the lift force acting on the wiper blade increases, such as when the vehicle speed or relative wind speed increases, for example. It is an object of the present invention to provide a wiper device with a variable set load of a wiper blade, which allows the blade to wipe the wiped surface well even in the case of the present invention.

The present invention will be explained in detail below based on an embodiment shown in FIGS. 2 to 4.

1 is a pivot, and a flange portion 1a provided on this pivot 1 is fixed to a vehicle body 2. 3 is a wiper shaft which is supported by the pivot 1 and rotates back and forth, and 4 is an arm head whose one end is fixed to the wiper shaft 3. 5 is an arm, and the arm 5 has a pivot pin 6 fixed to the other end of the arm head 4.
It consists of a channel 5a, one end of which is supported, and a rod 5b fixed to the other end of the channel 5a with a rivet 5c. A wiper blade 7 that is pressed against the wiping surface 10 shown in FIG. 1 is attached to the tip of the rod 5b.

A movable member 8 engages with the arm head 4 and is movable in the longitudinal direction of the arm head 4. An engagement pin 9 is fixed to one end of the movable member 8, and the arm 5 is connected to the other end of the movable member 8. A tension spring 11 that presses the wiper blade 7 against the wiping surface 10 is installed between the wiper blade 7 and the wiper blade 7. In the illustrated embodiment, one end of the tension spring 11 is hooked to the rod 5b, and the other end is attached to a spring piece 13 pivotally connected to a support shaft 12 fixed to the other end of the movable member 8. I made it hang. This spring piece 13 may be omitted; in that case, the tension spring 11 is directly attached to the support shaft 12.
All you have to do is hook the other end.

The movable member 8 is housed in the arm head 4, and as shown in FIG.
a, 4a, respectively, and this movable member 8
The upper surface 8b and the lower surface 8c are respectively engaged with the lower surface of the upper wall 4b of the arm head 4 and the upper surface of the bottom plate 4c which becomes a part of the arm head 4, and the second
As shown in the figure, the engagement pin 9 is attached to the bottom plate 4c.
A long hole 4d is provided in the arm head 4 to prevent interference with the arm head 4.
A hole is formed in the longitudinal direction of the arm head 4, so that the movable member 8 can freely slide in the longitudinal direction of the arm head 4. In addition, the bottom plate 4
c is fixed to the arm head 4 by a screw 14.

A cam 15 has a cam groove 15a and is pivotally connected to the pivot 1 or the wiper shaft 3, and a pair of protrusions 15 are formed by cutting out the outer peripheral surface of the cam 15.
b, 15c are formed. The cam groove 15a extends radially from the rotation center of the cam 15 and in the rotation direction of the wiper shaft 3, and a recess 15d is formed at the end of the cam groove 15a closer to the wiper shaft 3. In this embodiment, a roller 9a is rotatably pivotally connected to an engagement pin 9 fixed to one end of the movable member 8, and the engagement pin 9 is attached via the roller 9a.
was engaged with the inner peripheral surface of the cam groove 15a. That is, one end of the movable member 8 is connected to the engagement pin 9 and the roller 9a.
Since the cam 15 is engaged with the cam 15 through the
is biased in the longitudinal direction of the arm head 4, which is the direction of arrow B in FIG. It can be rotated. It is also possible to directly engage the engagement pin 9 with the inner peripheral surface of the cam groove 15a without using the roller 9a.

Reference numeral 16 denotes a stopper arm whose substantially central portion is pivotally connected to the vehicle body 2 near the pivot 1. This stopper arm 16 is rotatably pivoted to a support pin 17 fixed to the vehicle body 2, and notches 16d and 16e are provided between both ends 16b and 16c of the stopper arm 16 and the center, respectively. A lever 16a is integrally provided in the section. In addition, stoppers 2 are provided on the vehicle body 2 that engage with the notches 16d and 16e, respectively.
a, 2b are planted, and these stoppers 2a, 2
b regulates the amount of rotation of the stopper arm 16, so that the stopper arm 16 can be set at a predetermined position. That is, when the lever 16a is rotated manually or electrically in the direction of arrow C in FIG. 2, the notch 16d engages with the stopper 2a, and the lever 16a is rotated in the direction of arrow D. , the notch 16e engages with the stopper 2d, and the rotation range of the stopper arm 16 in both directions is determined, so that the stopper arm 16 can be set at a predetermined position.

By rotating the lever 16a in the direction of arrow C in FIG. 2 and setting the stopper arm 16 at a predetermined position, the protrusion 15b provided on the cam 15 can come into contact with the end 16b of the stopper arm 16. By rotating the lever 16a in the direction of arrow D and setting the stopper arm 16 at a predetermined position, the protrusion 15c is moved to the end 1 of the stopper arm 16.
It becomes possible to make contact with 6c.

Next, the operation of the wiper device according to this embodiment will be explained.

Normally, as shown in FIG. 2, the engagement pin 9 fixed to one end of the movable member 8 engages with the inner peripheral surface of the end of the cam groove 15a that is far from the wiper shaft 3 via the roller 9a. ing.

Now, for example, when driving at high speed or when the relative wind speed increases, the lift force acting on the wiper blade 7 increases and the pressing pressure of the blade 7 against the wiping surface 10 decreases, and the wiping performance of the wiper blade 7 decreases. If it is lowered, the lever 16a is manually or electrically rotated in the direction of arrow D in FIG. 2 to bring the notch 16e into contact with the stopper 2b. That is, the stopper arm 16 is set at a predetermined position.

The cam 15 swings together with the arm head 4, arm 5, and wiper blade 7 in the direction of arrow E in FIG.
The cam 15 is restrained when it comes into contact with c. Therefore, the roller 9a rolls on the inner circumferential surface of the cam groove 15a due to the swinging force of the arm head 4 due to the swinging of the arm head 4, and moves the movable member 8 in the longitudinal direction of the arm head 4, which is the arrow F in FIG. direction, and while extending the tension spring 11, the recess 15d at the other end of the cam groove 15a.
Get into it. Therefore, the tension T of the tension spring 11 increases and the set load P of the wiper blade 7 increases.
increases, the pressing pressure of the wiper blade 7 against the wiping surface 10 returns to its normal value, and the wiping performance of the blade 7 improves. Even if the wiper device is reversed and the cam 15 is also reversed, the roller 15a remains in the recess 15d.
The wiper blade 7 is not displaced from the cam groove 15a, and the wiper blade 7 can continue to perform a good wiping operation. The power that sets the stopper arm 16 at a predetermined position may be released when the arm head 4 is reversed.

Next, when the above state shifts to low-speed driving or when the relative wind speed decreases, the lift force acting on the wiper blade 7 decreases, and the pressing pressure of the blade 7 against the wiping surface 10 becomes too large, causing the wiping If performance deteriorates, lever 16
a in the direction of arrow C in FIG. 2 to bring the notch 16d into contact with the stopper 2a. That is, by setting the stopper arm 16 at a predetermined position, the arrow G shown in FIG. 2 of the cam 15 as the wiper shaft 3 rotates.
The protrusion 15b formed on the cam 15 by swinging in the direction
The cam 15 is restrained when it comes into contact with the other end 16b of the stopper arm 16. Therefore, the roller 9, which had entered the recess 15d at the other end of the cam groove 15a, due to the swinging force of the arm head 4
a overcomes the frictional force and rolls on the inner circumferential surface of the cam groove 15a to move the movable member 8 in the longitudinal direction of the arm head 4 in the direction of arrow B in FIG. 2, thereby compressing the tension spring 11. While the cam groove 15a
at one end (normal position). Therefore, the tension T of the tension spring 11 decreases, and the set load P of the wiper blade 7 decreases, so that the pressing pressure of the blade 7 against the wiping surface 10 becomes a normal value, and the wiping performance of the wiper blade 7 improves. . Even if the wiper device is reversed and the cam 15 is also reversed, the roller 9a will not be displaced from the cam groove 15a due to the tension T of the tension spring 11, and the wiper blade 7 can continue to perform a good wiping operation. .

In other words, when the vehicle speed or relative wind speed increases,
By rotating the lever 16a in the direction of the arrow D in FIG. 2 and setting the stopper arm 16 at a predetermined position, the cam 15 moves the movable member 8 in the direction of the arrow F in FIG. 2 as the arm head 4 swings. When the tension T of the spring 11 is increased to increase the set load P of the wiper blade 7, and the vehicle speed or relative wind speed decreases, the lever 16a is moved to the second position.
By rotating in the direction of arrow C in the figure and setting the stopper arm 16 at a predetermined position, the cam 15 moves the movable member 8 in the direction of arrow B in FIG. Since the set load P of the wiper blade 7 is reduced by reducing T, the pressing pressure of the wiper blade 7 to be brought into pressure contact with the wiping surface 10 is kept almost constant regardless of the state of the vehicle when it is running (including when it is stopped). This results in good wiping performance.

By setting the stopper arm 16 at a predetermined position, the cam 15 is restrained, and the swinging force of the arm head 4 causes the cam 15 to move the movable member 8 to the arm head 4.
Tension spring 1
By expanding and contracting the wiper blade 1, the tension T thereof can be changed, and the set load P of the wiper blade 7 can be varied. Therefore, its variable operation is simple, and the tension spring 11 can be directly expanded and contracted by an actuator with a large output unlike the conventional one, and its tension T can be adjusted.
Compared to a type in which the set load P of the wiper blade 7 is varied by changing the wiper blade 7, the set load P can be varied with a small amount of force, and the device can be made relatively compact and lightweight.

Next, FIGS. 5 and 6 show another embodiment of the present invention, in which the arm head 4 is engaged with the arm head 4.
A movable member 18 that is movable in the longitudinal direction is extended so as to pass through a longitudinal groove 4e provided on the lower surface of the portion of the arm head 4 to which the wiper shaft 3 is fixed. The movable member 18 is held by the groove 4e and the bottom plate 4c which becomes a part of the arm head 4,
Further, since a long hole 18a is formed in the middle of the movable member 18 and extends in the longitudinal direction of the arm head 4, interference with the wiper shaft 3 is prevented when the movable member 18 moves. 4 can be slid freely in the longitudinal direction.

The cam 25, which is pivotally attached to the pivot 1 or the wiper shaft 3 and drives the movable member 18, is a cam whose outer circumferential surface is eccentric from the rotation center, and has recesses 25a and 25b on the outer circumferential surface. In this position, the engaging pin 9 fixed to one end of the movable member 18 is engaged with the recess 25a on the outer peripheral surface of the cam 25 via the roller 9a. Therefore, the cam 25 is urged in the direction of arrow B in FIG. 5, which is the longitudinal direction of the arm head 4, by the tension of the tension spring 11 via the movable member 18 and the spring piece 13, and the cam 25 3 and can be rotated back and forth. Note that it is also possible to directly engage the engagement pin 9 with the outer peripheral surface of the cam 25 without using the roller 9a. On the lower surface of the cam 25, there is a pair of protrusions 25c, 25 that can come into contact with either end 16b, 16c of the stopper arm 16, respectively.
d is provided. The rest of the structure is almost the same as that of the embodiment described above, and the same or equivalent parts are given the same reference numerals as those of the embodiment described above, and the explanation thereof will be omitted.

Now, the roller 9a is engaged with a recess 25a provided on the outer circumferential surface of the cam 25 as shown in FIG. 7 shows a state in which the set load P is increased.

From the above state, the lift force acting on the wiper blade 7 decreases, for example, when the vehicle moves to low speed or when the relative wind speed decreases, and the blade 7
If the pressing pressure against the wiping surface 10 becomes too large and the wiping performance deteriorates, the lever 16a can be rotated in the direction of arrow D shown in FIG. 5 to set the stopper arm 16 at a predetermined position, as in the previous embodiment. When the cam 25 swings with the rotation of the wiper shaft 3, the protrusion 25d moves to the one end 1 of the stopper arm 16.
6c, the cam 25 is restrained, and then the roller 9a, which had entered the recess 25a due to the swinging force of the arm head 4, overcomes the frictional force and rolls on the outer peripheral surface of the cam 25, and the movable member 18 is moved in the direction of arrow B in FIG. 5, and enters into the recess 25b while contracting the tension spring 11. Therefore, the tension T of the tension spring 11 is reduced and the set load P of the wiper blade 7 is reduced, so that the blade 7 can perform a good wiping operation.

Next, when moving to high speed or when the relative wind speed increases, the cam 25 is restrained by rotating the lever 16a in the direction of arrow C in FIG. 5 and setting the stopper arm 16 at a predetermined position, and then the arm head The roller 9a, which had entered the recess 25b by the swinging force of 4, rolls on the outer peripheral surface of the cam 25 and moves the movable member 18 in the direction of arrow F in FIG.
While extending the tension spring 11, it enters the recess 25a. Therefore, the tension T of the tension spring 11 increases, and the set load P increases, so that the blade 7 can perform a good wiping operation.

As explained above, according to the variable wiper blade set load wiper device of the present invention, by setting the stopper arm at a predetermined position, the cam pivotally connected to the pivot or wiper shaft is restrained, and the cam is moved by the swinging force of the arm head. The movable member is moved in the longitudinal direction of the arm head, the tension spring is expanded and contracted, and the tension of the spring is changed to vary the set load of the wiper blade. Therefore, the variable operation is simple and can be done without the need for conventional wiper blades. Compared to a type that directly expands and contracts a tension spring using an actuator with a large output and changes the tension to vary the set load of the wiper blade, the set load can be varied with a small amount of force, and the device It has the advantage of being relatively compact and lightweight.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the principle of the wiper device, Figure 2
The figure is a partially sectional perspective view showing an embodiment of a wiper blade variable set load wiper device according to the present invention.
Figure 3 is its cross-sectional front view, Figure 4 is A-A in Figure 3.
5 is a partially sectional perspective view showing another embodiment of the wiper blade variable set load wiper device according to the present invention, and FIG. 6 is a sectional front view thereof. In the drawings, the same reference numerals indicate the same or equivalent parts. 1... Pivot, 2... Vehicle body, 3... Wiper axis, 4... Arm head, 5... Arm, 6...
Pivot pin, 7... Wiper blade, 8, 18...
Movable member, 9... Engaging pin, 10... Wiping surface, 1
1...Tension spring, 15, 25...Cam, 15a...Cam groove, 16...Stopper arm.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A wiper shaft that is supported by a pivot fixed to the vehicle body and rotates back and forth, an arm head whose one end is fixed to the wiper shaft, and a pivot pin at the other end of the arm head. an arm with one end supported through the
A movable member that engages with the arm head and is movable in the longitudinal direction of the arm head; The stopper arm has a substantially central portion pivotally connected to the vehicle body, and a cam that is pivotally connected to the pivot or wiper shaft and drives the movable member, and one end of the movable member is engaged with the cam, and the movable A variable set load wiper device for a wiper blade, characterized in that the tension spring is stretched between the other end of the member and the arm. (2) The cam has a cam groove extending radially from the rotation center and in the rotation direction of the wiper shaft, and a locking member fixed to one end of the movable member is provided on the inner peripheral surface of the cam groove. A variable set load wiper device for a wiper blade according to claim 1, characterized in that a mating pin is engaged. (3) The utility model registration claim is characterized in that the outer peripheral surface of the cam is eccentric from the center of rotation, and an engaging pin fixed to one end of the movable member is engaged with the outer peripheral surface of the cam. A variable set load wiper device for wiper blades according to scope 1.