JPS5953255A - Wiper apparatus for car - Google Patents

Abstract

PURPOSE:To permit the downward reversal position of a wiper blade to be varied in two stages by installing a turnable pin part for varying the locus of turn in two stages, onto a conversion mechanism which is equipped with a crank arm which converts the rotary movement of a motor to the reciprocative movement of a link rod. CONSTITUTION:The revolution of a driving shaft 11 due to driving of a wiper motor is converted to the reciprocative movement of a link rod 10 through a crank arm 7 and a turnable pin part P4, and a wiper blade 30 is provided with sweeping operation. In such an apparatus, said turnable pin part P4 is constituted by incorporating in turnable ways, onto a crank pin 1 fixed at the outer edge of the crank arm 7, an eccentric bush 3 which is made of oil-immersed sintered metal and has an amount of eccentricity of DELTAA and a lever 4 constituted of a steel plate for spring which is integrally formed with the bush 3 by a hook 4a. Said lever 4 is turned between the position shown in the figure in which a joint 15 is engaged into a hole 5 and the position is 180 deg. turn in which the joint 15 is engaged into a hole 6, and thus the downward reversal position of the blade 30 can be varied in two stages L1 and L2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper device for a vehicle that reciprocates and wipes a windshield surface of a vehicle.

In this type of wiper device, all or part of the wiper blade is always stored inside the hood of the vehicle and is hidden from the driver's view. There is a so-called retractable wiper (also called a concealed type or semi-concealed type).

(3) However, with this type of wiper, when the wiper is activated, the wiper blade normally wipes from the time when it rises from the storage position to the lower wiping inverted position (after it rises up) to the lower wiping inverted position. This type of wiper device was expensive because it had a complicated mechanism called a wiper mechanism.

Therefore, it is desirable to not have a rise-up mechanism and to discard all or part of the wiper blade from the driver's field of view when the wiper is not in operation. To achieve this, the downward inversion position during wiping may be lowered further than before, so that when the wiper blade is in the downward inversion position, all or part of the wiper blade is out of the driver's field of vision.

However, with this method, the wiper blade always reaches the downward inverted position while the wiper motor is operating, so if snow accumulates on the lower surface of the window in winter, the snow will prevent the wiper blade from descending while the wiper motor is energized. There was a drawback (4) in that the wiper blade, wiper link rod, or wiper motor could be damaged or overload failures could occur.

Therefore, there is a need for a wiper device for a vehicle in which the movement of the wiper blade is not restricted in the vicinity of the downward inversion position, or even if the movement is restricted, the wiper device does not cause damage or failure as described above, and it is an object of the present invention to The purpose is to make it into a device.

1 to 10 showing the first embodiment will be explained below. In this first embodiment, the engagement between the lever 4 and the wiper link rod 10 is achieved by connecting a rotatable connector 15 provided at the tip of the lever 4 to a hole in the wiper link rod 10.
The engagement between the lever 4 and the crank arm 7 is completed by inserting the cylinder head 15 into the hole 5 provided in the crank arm 7. .

First, FIG. 1 is a drawing schematically showing the overall configuration of the first embodiment, where 30 is a wiper blade, W is a front window of a car, 31 is a wiper arm, 32 is a pivot part, and 33 is a wiper blade.
is a lever, and P I + P 3 is a rotating pin portion that pivotally connects the link rods, etc. (5).

P4 is a rotating bottle part, but unlike P and P3, this part has an eccentric bushing 3, and its details are shown in Figs. 2 to 4 in cross section along the arrow F-F line. The structure is shown in .

In FIG. 1, when the crank arm 7, which is the output part of the wiper motor M, rotates in the direction of arrow Z, the link rod 10 reciprocates, and the wiper blade 30 moves toward the wind surface W.
to dispel.

The skeleton diagram in FIG. 12 schematically shows this movement. The reciprocating movement of the wiper link rod 10 causes the lever 33 to swing about the pivot portion 32, and as a result, the wiper blade 30 moves against the wind surface W. Dispel. M in Figure 12
is a wiper motor, and B is the center of the drive shaft 11 which is the wiper motor output shaft. This shows that when the rotating pin P4 rotates in the direction of arrow Z from the state shown in FIG. 12, the link rod 10 moves in the direction of arrow X.

In this case, when the rotating pin P4 rotates not on a solid circle but on a single point (6) on a chain line circular trajectory K, the wiper blade moves at an angle θ.
The wiper blade 30 moves back and forth between L2 and lower inversion positions I and 3, so that even if snow accumulates near the lower inversion position in winter, the wiper blade 30 will move upwards by 1, and the lower inversion position will move from Ll to L2. No failure will be induced.

Hereinafter, a structure for switching the rotation locus of the rotary bin P4 into two stages, such as "double series", will be described in detail.

To put it simply, this device rotates the eccentric bush 3 180 degrees around the bottle 1 as shown in Figures 2 and 3.
This is done by changing the dimension from the center axis C to the center B of the case 2, which is the center axis of the rotating pin P4. This is done by locking the locking rod 15 connected to the lever 4.

In FIGS. 2 to 10, reference numeral 7 denotes a crank arm that is connected to a drive shaft 11 of a wiper motor, which is a drive shaft, by a nut 12, and a joint 15 is attached to a coupling cylinder (7). It has a stepped crank bin 1 made of a steel rod and is fixed by caulking.

The crank bottle 1 includes an eccentric bushing 3 made of oil-impregnated sintered metal with an eccentricity A, and a pawl 4a between the eccentric bushing 3 and the eccentric bushing 3.
A lever 4 made of an integrated spring steel plate is rotatably assembled with a washer 8 and a snap ring 9.

A joint 15 made of polysecure resin is rotatably caulked to the lever 4.

A wiper link rod 10 has a hole 6 to which a joint 15 is connected.

The -WR15a of the joint 15 has a cross-sectional shape of 6th in order to prevent the cylinder 15 from being disconnected from the hole 5 of the crank arm 7 and the hole 6 of the rod 10 due to vibration or the like.
As shown in the figure, it has an oval shape, and the lever 4 has a presser bush 16 (FIG. 5).

Further, one end of the joint 15 has a groove 15b for inserting a driver as shown in FIG.

A case 2 is integrally molded with the rod 10 from a polyacetal resin material, and is rotatably assembled on the eccentric bushing 3 (8). 13 is a waterproof rubber that prevents water from entering the eccentric bushing 3, the case 2, and the rotary bushing of the crank bin 1, and is rotatably assembled to the eccentric bushing 3.

14 is a rubber that prevents water from entering the rotating parts of the crank bin 1 and lever 4, and is rotatably assembled to the crank bin 1.

With the above configuration, when the joint 15 is assembled into the hole 5 of the crank arm 7 as shown in FIG.
a. Lever 41 is integrated with the crankbin 1 via the cylindrical 15° arm 7, so the eccentric bushing 3 slides between the case 2 and the case 2 when the wiper is operated, and the center axis C of the case 2 has a rotation radius around B. Rotates at (A+ΔA).

Also, from the state shown in Fig. 2, rotate the joint 15 in the direction of the arrow to remove it from the hole 5, and then rotate the lever 4 180 degrees around the bottle 1 to remove the joint 15 as shown in Fig. 3. When assembled into the hole 6 of the rod 10, the eccentric bushing 3 becomes integrated with the case 2 via the case 2 -> rod 10 - joint 15 - pawl 4a of lever 4 -> bush (9) 3, so when the wiper operates, the eccentric bushing 3 becomes integral with the case 2. The bush 3 slides on the crankshaft 1, and the central axis C of the case 2 rotates around point B, with the radius changing from A+ΔA to A−ΔA as shown in FIGS. 3 and 4.

The rotation locus of the center C is similar to the thick dashed line in FIG.

Therefore, by stopping the motor at the lower inverted position as shown in FIG. 2, rotating the lever 4 by 180 degrees, and then changing the joint 15 from connecting it to the hole 5 of the crank arm 7 to connecting it to the hole 6 of the rod 10. As shown in FIG. 12, the lower inversion position 3 remains the same, the lower inversion position is changed from Ll to L2, and the wiping angle can be reduced by θ1. Of course,
It is also possible to do the opposite.

Note that the rotation of the lever 4, that is, the rotation of the eccentric bush 3 by 180 degrees
The degree of rotation is as shown in Figure 2 (wiper blade 30 (first
2) is at the lower reversal position Ll, the wiper motor is stopped (the drive shaft 11 is stopped). When the wiper switch is turned off, a normal wiper device stops at the lower reversal position L1 (10), so that the eccentric bushing 3 can be easily rotated.

Note that in a wiper device that can be stopped even when the wiper blade 30 is in the downward inverted position and can be stopped, there is no need to manually rotate the lever 4 and thus the eccentric bushing 3.
In the state shown in FIG. 4, it is sufficient to simply rotate the shield 15 to switch from engagement with the hole 5 to engagement with the hole 6.

Next, FIGS. 11(A) and 11(B) show a second embodiment in which the first embodiment is slightly modified.
c, and the crank arm 7 and rod 10 are coupled to the joint 15 by holding the crank arm 7 or rod 10 in the recess 15c.

In this way, the hole (9th hole) of the crank arm 7 and rod 10
The holes 5 and 6 in FIG. 10) are omitted, and the other parts are the same as the first embodiment.

That is, in the second embodiment, the lever 4 and the wiper link rod 10 are engaged by inserting the wiper link rod 10 into the recess 15C of the lever 4 (11). The crank arm 7 is engaged with the lever 4 by inserting the crank arm 7 into the recess 15c of the lever 4.

Next, in Fig. 13, the eccentric bushing 3 rotates (revolutions) around the center B when viewed in the direction of the arrow E in Fig. 3, that is, from above.
The eccentric bushing 3 and the wiper link rod 10 are integrated in the process of rotating in the direction of the arrow Z in FIG. 13 from the state shown in FIGS. The relative position between them does not change, and when the rod 10 reaches the lower reversal position L3, it is in the state shown by the dashed line 10a on the right side (Fig. 13), and from the center B to the center of the rotation bin P4, that is, the collar 2. The dimension to the central axis C1 is A+ΔA.

In other words, in winter, the dimension from the center B to the center axis C2 of the rotating bin P4 (collar 2) is A-ΔA at the lower inverted position L2, and A+ΔA at the lower inverted position L3, and the distance between these is A-ΔA. As shown in the trajectory of the dashed line, the central axis c, C
,,c2 moves.

Above 1st. In the second embodiment, the eccentric bushing 3 (12) is made of oil-impregnated sintered metal, but it may also be made of a metal material such as bronze or a resin material, which has good bearing performance.If the load is small, a copper material may be used. Good too.

The lever 4 is made of a spring steel material and is integrated with the eccentric bushing 3 by a pawl 4a, but the material from which it is made may be other metal materials such as phosphor bronze, resin materials such as polyacetal, or As for the connection structure with the bushing 3, the lever 4 may not have the pawl 4a, but a protrusion that fits into the hole of the lever 4 may be provided on the eccentric bushing 3 side. Any structure is acceptable.

In particular, when made of resin, the lever 4 and eccentric bushing 3 may be integrally molded.

In addition, although the operation button of the joint 15 is made into the groove 15b, it may be a cross hole into which a Phillips head screwdriver is inserted, or a hexagon hole into which a hexagonal wrench is inserted.Also, it is made into a cylindrical shape that allows manual operation, and the cylinder is knurled. It may be provided.

Although the cylinder 15 and the lever 4 are connected in a crimped manner, any structure may be used as long as the lever 4 can be assembled in a rotatable manner, such as by connecting the lever 4 with a snapper (13) with a snap axle.

The material of joint 15 was polyacetal resin, but
It may be made of metal material. Furthermore, although the cylinder head 15 is an integrally molded resin product, the connecting portion of the joint 15 to the lever 4 and the connecting portion to the rod 10 and crank arm 7 may be separate parts and integrated by caulking or the like.

The cross-sectional shape of the dislodging prevention part I5a of the joint I5 shown in FIG. It may be of any shape.

In addition, the crank bin 1 is made of steel and is a stepped bin, but if the load is small, the material may be a metal material such as brass or a resin material such as polyacetal, and the shape may not be a stepped bin, but a straight bin. Separate parts such as washers may also be used.

If there is no risk of water breaking on the rotating parts of the eccentric bushing 3, case 2, and crank bin 1, and the rotating parts of the crank bin 1 and lever 4, waterproof rubbers 13 and (14) are unnecessary. There is no need for the crank bin 1 to be stepped.

Next, a third embodiment will be described in detail using FIGS. 14 and 15. Note that the overall configuration of the wiper is the same as that shown in FIG. 1. Also, codes 1, 2, 3, 4° 5.6, 7, 8, 9
．． The portions 10, 11, 12, 13, and 14 are equivalent to the first embodiment.

The polyacetal resin cylinder 15 has a spiral groove 15d into which the claw portion 17a of the change shaft 17, which is a copper rod, is rotatably assembled into the through hole of the drive shaft 11. When the shaft 17 is rotated (by inserting a hexagonal jig into the hole 20a of the knob 20 and rotating the shaft 17), the cylinder 15 rotates by 90 degrees, forming a spiral shape.

Cylind 15 has a fan-shaped protrusion 15e that occupies 1/4 of the cylinder.
When the crank arm 7 is rotated by 90 degrees, the connection is switched from the connection with the hole 5 of the crank arm 7 to the connection with the hole 6 of the rod 10.

Moreover, when the rotation is reversed, the connection situation is also reversed.

(15) 20 is a knob made of polyacetal resin, and this knob 2
A change shaft 17 is press-fitted into the 0 and integrated. 19 lowers the change shaft 17 so that the joint 15 does not normally come into contact with the claw part 17a.
This is a compression spring for positioning the claw portion L7a at the solid line position in FIG. 22 is a knob 20 made of polyacetal resin.
The protective cover is fastened to the cover plate 18 with screws 21.

With the above configuration, when the protective cover 22 is removed and the knob 20 is pushed up and turned, the change lever 17 rotates, and the JTLJ17a of the change lever 17 is
Since the joint 15 is inserted into the spiral groove 15d of No. 5 and moves within the groove 15d, the joint 15 rotates by 90 degrees. Therefore, the coupling of the fan-shaped protrusion 15e of the joint 15 is switched from the hole 5 of the crank arm 7 to the hole 6 of the rod 10, so that the first. As in the second embodiment, the wiping angle can be changed. Of course, the reverse is also possible.

In addition, in the third embodiment, the reason why the cylinder head 15 is switched from the hole (16) 5 of the crank arm 7 to the rod 10 side and the lower inverted position is raised by θ1 is that the rotating pin P4 is moved as shown in FIG. This is done when it is on the right side, that is, in the downward reverse rotation position.

That is, in this third embodiment, as in the first embodiment, the lever 4 and the wiper link rod 10 are connected by connecting the rotatable connector (joint 15) provided at the tip of the lever 4 to the hole in the wiper link rod 10. 6, and the lever 4 and the crank arm 7 are engaged by rotating the joint 15 so as to insert it into the hole 5 provided in the crank arm 7. It is something that will be completed.

However, in addition to this, in this third embodiment, a change shaft 17 serving as a power transmission means is provided which is movable in the axial direction inside the drive shirt 11 in order to rotate the cylinder head 15. Insert the tip of the change shaft 17 into the helical groove 15d of the joint 15 and engage it, (17) manually operate the knob 20 at the rear end of the change shaft 17 to move the change shaft 17 into the drive shaft 11. By moving the joint 15 inside, the joint 15 is remotely rotated.

In this case, since the spiral groove 15d is spirally provided along the axis of the joint 15 as shown in FIG.
When a is rotated from side to side, the tip of the claw part 17a is aligned with the spiral groove 1.
Since it slides within 5d, the cylinder head 15 rotates 90 degrees at that time. For example, in FIG. 15, when the claw portion 17a is located within the spiral groove 15d, if the claw portion 17a is rotated in the direction of the arrow H, the cylinder 15 will be rotated in the direction of the arrow H.

In addition, in FIG. 14, the shield 15 is engaged in the hole 6, and the claw portion 17a is on the lower side as shown by the solid line. Therefore,
If you want to rotate the cylinder head 15, the claw part 17a will collide with the cylinder head 15 even if you lift the claw part 17a upwards, so first rotate the change lever 17 so that the claw part 17a moves upward (18). , and then bend the compression spring 19 to push the claw portion 17a upward.
Then, the claw portion 17a is rotated, inserted into the spiral groove 15d as shown by the broken line, and rotated in the direction of arrow H in FIG. 15.

In addition, in FIG. 14, M+ is a motor output shaft of the wiper motor, and M2 is a worm wheel, which is integrated with the drive shaft 11.

Next, FIGS. 6 to 21 showing the fourth embodiment will be explained.

This fourth embodiment has an engagement hole 4C (19th hole) at the tip of the lever 4.
), and on the other hand, protruding stoppers 5a and 6a are provided on the wiper link rod 10 and the crank arm 7, respectively.
By selectively locking each stopper 5a or 6a in the engagement hole 4C of the lever 4, the dimension from the center axis B of the drive shaft 11 to the center axis C of the case 2 can be reduced to 2.
It changes in stages.

The fourth embodiment will be described in detail below using FIGS. 16 to 21 (19). Reference numeral 7 denotes a crank arm, to which a stopper 5a made of a steel plate is fixed by spot welding, and a stepped crank bottle 1 made of a steel rod is fixed by caulking. The crankshaft 1 includes an eccentric bushing 3 made of oil-impregnated sintered metal, and a lever 4 made of a spring steel plate.
It is assembled so that it can rotate freely.

The lever 4 has a retaining hole 4C so that it can be hooked onto the stopper 5a and the stopper 6a. A case 2 is integrally molded with the rod 10 from a polyacetal resin material, and is rotatably assembled to the eccentric bushing 3.

A stopper 6a is made of a steel plate and is spot welded to the rod 10.

With the above configuration, when the lever 4 is assembled to the stopper 5a as shown in FIG. 16, the eccentric bushing 3 moves to the lever 44. Since it is integrated with the crank bin 1 via the stopper 5a and the arm 7, the relative position of the bin 1 and bush 3 remains constant and the eccentric bush (20) slides between the bush 3 and the case 2 when the wiper is operated. , the central axis C of the case 2 has a rotation radius (
A+ΔA).

Also, when the wiper blade is in the downward inverted position, if the lever 44 is assembled to the stopper 6a as shown in FIG. 17, the eccentric bushing 3 will move to the lever 4. Stopper 6a.

Since it is integrated with the case 2 via the rod 10, the relative position between the bush 3 and the case 2 does not change during rotation, and when the wiper is operated, the eccentric bush 3 slides between the crank bin 1 and the case 2. The central axis C of 2 is centered on point B and is
As shown in Fig. 8, the radius changes from A+ΔA to A−ΔA as it rotates. The rotation locus of the center C is similar to the thick dashed line in FIG.

Therefore, after cranking the lever 4, the stopper 5a on the arm 7
By changing the connection from the connection to the stopper 6a on the rod 10, the downward reversion position WLI can be increased by θ1 to L2 while the upper inversion position 3 (FIG. 12) remains the same. Of course, the opposite operation is also possible.

(21) In addition, when the lever 4 is rotated 180 degrees in the lower inverted position as shown in Fig. 16 and reassembled from locking to the stopper 5a to locking to the stopper 6a, the rotation torque of the lever 4 is ΔA. If the dimensions of
cm) and small.

Furthermore, when the lever 4 is rearranged and operated when the crank arm 7 is in the upside-down position as shown in FIG. All you need to do is switch to .

In the above fourth embodiment, the stopper 5a and the stopper 6a
is constructed by spot welding a steel plate to the crank arm 7 and rod 10, but copper or other metal materials, resin materials, or hard rubber materials may be joined by integral molding, caulking, or screw tightening. Arm 7 and rod 1
The stoppers 5a, 6a may be molded from scratch by press punching.

In addition, in the fourth embodiment, the lever 4, the stopper 5a, and the stopper 6a are connected by hooking the lever 4 through the retaining hole (22) 4C (opening part), but the stopper 5
A and the stopper 6a may be provided with openings to hook the claws of the lever 4, or the lever 4, the stopper 5a, and the stopper 6a may be connected by screwing.

Further, although the lever 4 is connected to the stopper 5a provided directly on the crank arm 7 itself, the lever 4 may be connected to any other object as long as it rotates integrally with the crank arm 7, such as a nut. 12. Drive shaft 11. The crank bin 1 and lever 4 may be combined. That is, the lever 4 may be connected to the crank arm 7 side.

Next, a fifth embodiment will be explained using FIGS. 22 to 27. In this fifth embodiment, the lever 4 is moved to the stay 4d.
The stay 4d is a washer-like member that engages with the eccentric bushing 3 and rotates together with the eccentric bushing 3, and the slider 4e is constructed by combining the stay 4d with the stay 4d. (23) It is expandable and retractable in a substantially radial direction of the stay 4d and, further, in a substantially radial direction of the eccentric bushing 3, and has a spear-like or plug-like engagement with the tip bushing. It has a protrusion (also referred to as a lance) 4f, and removable outlet-shaped stoppers 5b and 6b are provided on the wiper link rod 10 and crank arm 7 sides, respectively, to engage with the lance 4f. The slider 4e (which rotates together with the eccentric bushing 3) is rotated, extended and slid, and the slide!
The lance 4f at the tip of the lance 4e is selectively coupled to either the wiper link rod 10 or the crank arm 7.

Hereinafter, a fifth embodiment of the present invention will be described in detail using FIGS. 22 to 27. In Figures 22 to 27,
7 is the drive shaft 11 of the wiper motor which becomes the drive shaft
A crank arm is connected to the crank arm by a nut 12.

A stopper piece 5b (FIG. 25) made of a spring steel plate is fixed to the crank arm 7 by spot welding. In addition, the crank arm 7 is attached by caulking a stepped crank pin (24) made of a steel rod.
It is fixed to . An eccentric bushing 3 made of oil-impregnated sintered metal and having an eccentricity ΔA is rotatably attached to the crankshaft 1.

4d is a stay, the shape of which is shown in FIG. 27.

This stay 4d is made of steel plate and has claws 4a and 4b.
is inserted into the hole 3a (FIG. 22) of the eccentric bushing 3.

4e is a slider (slider), whose single item shape is the second
It is shown in Figure 7. The stay 4 is in the hole 4e+ of the slider 4e.
The claw 4a of d is inserted. Therefore, slider 4e
is slidable in two directions X I + X in FIG. 24 with respect to the stay 4d.

8 is a washer, 9 is a snap ring, and these prevent the eccentric bush 3 from coming off from the crank bin 1.

Note that the claw 4a of the stay 4d can engage with the hole 4e+ of the slider 4e in FIG. 27 and the hole 3a of the eccentric bushing 3 in FIG.
It rotates as one through the.

(25) A lance 4f made of a steel plate that can be coupled to the stopper piece 5b and the stopper piece 6b is spot welded to the slider 4e.

Reference numeral 3 denotes a case integrally molded with the rod 10 from a polysecure resin material, and is rotatably assembled to the eccentric bushing 3.

Numeral 6b is a stopper piece made of a spring steel plate, and like the stopper piece 5b, its dimensions are determined so that it can be connected with the lance 4f with appropriate moderation.

10 is a wiper link rod, and a synthetic resin case 2 is insert-molded therein, and an eccentric bushing 3 is rotatably held in this case 2. The stopper piece 6b is caulked to the rod 10 by a beam bet 23.

Numeral 24 is a reinforcing member that reinforces the stopper piece 6b, and is caulked to the rod 10 together with the stopper piece 6b by a rivet 23.

13a is a waterproof rubber (26) that prevents water from entering the rotary bushings of the eccentric bushing 3, the case 2, and the crank bin l, and is assembled to the rod 10. 14 is a waterproof rubber that prevents water from entering the rotating parts of the crank bin 1 and the stay 4, and is rotatably assembled to the crank bin 1.

FIG. 22 shows a state in which the lance 4f is assembled to the stopper piece 5b of seven crank arms, and the hanging protrusion 4f1 (Fig. 27) of the lance 4f is replaced by the stopper piece 5b (Fig. 27) made of a spring material. This is a cross-sectional view showing a state in which they are snapped together and integrated.

With the above configuration, when the lance 4f is assembled to the stopper piece 5b as shown in FIG. 22, the eccentric bushing 3 is integrated with the crankbin 1 via the pawl 4a, stay 4d, pawl 4b, slider 4e, lance 4f, and stopper piece 5b. Therefore, the relative position of the bushing 3 and the bottle 1 does not change, and when the wiper is operated, the eccentric bushing 3 slides between it and the case 2, and the central axis C of the case 2 is centered around the point B. It rotates with a radius of rotation (A+ΔA).

Also, the lance 4f is attached to the stopper piece 6b (27) on the rod 10 side.
) When assembled as shown in Fig. 23, the eccentric bushing 3 becomes integrated with the rod 10 and eventually the case 2 via the stopper piece 6b, so the relative position between the bushing 3 and the case 2 does not change when the wiper is operated, and the eccentric bushing 3 slides between it and the crank bin 1, and the central axis C of the case 2 rotates around point B as the radius changes from A+ΔA to A−ΔA as shown in FIGS. 23 and 24. The rotation locus of the center C is similar to the thick dashed line in FIG.

Therefore, the wiper motor is stopped at the upper determination position as shown in FIG.
By sliding the slider 4c in the direction of
The lower inversion position can be made smaller by θ1. Of course,
The reverse operation is also possible.

In the fifth embodiment described above, the stopper piece 5b and the stopper piece 6b are made by spot welding or riveting the spring steel plate to the crank arm 7 and the rod 10, respectively (28), but other metal materials, resin materials, hard rubber, etc. The stopper pieces may be formed from a material, caulked, and connected by screwing. Also, the stopper piece 5b.

6b may be made of resin and insert molded into the crank arm 7 or rod 10.

Further, if there is no problem in terms of strength, the reinforcing member 24 may be omitted.

Although the stay 4d is integrated with the eccentric bushing 3 by a steel claw 4a, the material of the stay may be a metal material such as aluminum or a resin material such as polyacetal.

Also, the method of connecting the bushing 3 and the stay 4d is different from the stay 4d.
Instead of providing the claw 4a, the bush 3 may be provided with a protrusion that fits into the stay 4d.

In particular, when the stay 4d and the eccentric bushing 3 are made of resin, the stay 4d and the eccentric bushing 3 may be integrally formed.

Next, FIG. 28 shows a sixth embodiment which is a partial modification of the fifth embodiment, in which the eccentric bush 3 is provided with a guide groove 25 for the slider 4e, and the groove 25 (29) and the hole 4e+ and the stay 4d is omitted.

Next, seven embodiments will be described in detail using FIGS. 29 to 33. Reference numeral 7 denotes a crank arm, which is connected by a nut 12 to a drive shaft 11 of a wiper motor serving as a drive shaft. This crank arm 7 has a medium-sized groove 5a+ into which a pawl 4e2 of a slider 4e made of a steel plate can be inserted. Further, a stepped crank bin 1 made of a steel rod is fixed to the crank arm 7 by caulking.

An eccentric bushing 3 made of oil-impregnated sintered metal and having an eccentricity ΔA is rotatably attached to the crankshaft 1.

4d is a stay made of a spring steel plate, and slider 4e
It has a claw 4a+ that engages with. A slider 4e rotates integrally with the stay 4d, but can slide in two directions indicated by arrows X + + X in FIG. 29. The lever 4 is composed of the slider 4e and the stay 4d.

8 is a washer, 9 is a snap ring, and Bi (30) The eccentric bushing 3 is assembled to the ring 1.

Reference numeral 26 denotes a joint pin made of steel, and this joint pin 26 is fixed to the stay 4d, and an engagement lever 27 is rotatably attached to the outer periphery of the joint pin 26. Further, the engagement lever 27 integrally has a lance portion 27a. A spring 28 is wound around the outer circumference of the cylinder bin 26, and this spring 28 moves the engagement lever 27 to the 29th
I am trying to rotate it in the direction of the arrow in the diagram. However, in the state shown in FIG. 29, the engagement lever 27 contacts the slider 4e and cannot move in the direction of the arrow.

Further, the spring 28 is fitted into the bottle 20, and both ends 28a and 28b of the spring 28 are engaged with the engagement lever 27 and the slider 4e.

A case 2 is integrally molded with the rod 10 from a polyacetal resin material, and is rotatably assembled to the eccentric bushing 3.

The rod 10 has a hole 6 into which the lance portion 27a of the engagement lever 27 can be coupled. 13a is attached to the rod 10 with waterproof rubber that prevents water from entering the eccentric bushing 3, the case 2, and the rotating portion (31) of the crank bin 1. Reference numeral 14 is made of waterproof rubber that prevents water from entering the rotating parts of the crank bin 1 and the lever 22, and is rotatably assembled to the crank bin 1.

With the above configuration, when the slider 4e is pushed in the X1 direction of FIG. 33 in the state of FIG. 33 in which the wiper blade is in the upper inverted position, the engagement lever 27 is moved to the tip 4e of the slider 4e.
3, the claw 4e2 of the slider 4e fits into the groove 5al of the crank arm 7, and the eccentric bush 3 becomes integrated with the crank bin 1. The bushing 3 slides between the case 2 and the central axis C of the case 2 rotates around point B with a radius of rotation (A+ΔA).

Furthermore, when the slider 4e is pushed in the X2 direction at the upper inverted position, the pawl 4e2 of the slider 4e is removed from the groove 5al of the crank arm 7 as shown in FIG. 33, and the lance portion 27a of the engagement lever 27 is Since it is connected to the hole 6 of the rod IO, the eccentric bushing 3 becomes integral with the case 2. Therefore, (32) When the wiper is operated, the eccentric bushing 3 slides between the crankshaft 1 and the central axis C of the case 2 has a radius of A+ΔA centered on point B as shown in FIGS. 31 and 33. It rotates while changing from A-ΔA. The rotation locus of the center C is similar to the thick dashed line in FIG.

Therefore, the motor is stopped at the upper reverse position, and the slider 4e is
By pushing in the X1 direction or the X2 direction, the slider 4e connected to the eccentric bush 3 can be connected to the crank arm 7, or the engagement lever 27 connected to the eccentric bush 3 can be connected to the rod 10. , thereby keeping the top flipping position the same and changing the bottom flipping position to θ!
It can only be turned up and down. In the embodiment shown in FIG. 29, a groove 5al is provided in the crank arm 7.
In this embodiment, the pawl 4B2 of the slider 4e is inserted into the slider 4e, but the slider 4e may be provided with a groove and the crank arm 7 may be provided with a pawl.

Note that the present invention may be used in a general wiper device (33) other than a concealed wiper or a semi-concealed wiper.

As described above, the present invention includes a drive shaft (11) that continuously rotates in one direction, a crank arm (7) that is fixed to the drive shaft and rotates together,
A crank bin (1) fixed to the crank arm (7)-H, an eccentric bushing rotatably attached to the crank bin (1) and having a central axis eccentric to the central axis of the crank bin (1). (3), a case (2) rotatably attached to the eccentric bush (3), the case (2);
a wiper ring rod (10) that is fixed to and reciprocates left and right as the crank arm (7) rotates;
, a wiper blade (30) connected to the wiper link rod (10) and wiping the windshield surface of the vehicle from the upper inverted position to the lower inverted position;
3), is rotatable around the crank bin (1) together with the eccentric bush (3), and selectively engages with the wiper ring rod (10) side or the crank arm (7) side. Since it is equipped with a lever (4) that changes the lower reversal position of the Wibub (34) and the blade (30) in at least two stages, the eccentric bush (34) is simply
The wiping angle of the wiper blade (30) can be changed by simply selecting the locking state of the lever (4) connected to the lever (3), and the wiping angle of the wiper blade (30) and link rod (10) due to snow accumulation in winter can be changed. Also, it is highly effective in eliminating failures of the wiper motor (M).

[Brief explanation of the drawing]

ff Figure 11 is an overall configuration diagram of a wiper device showing the first embodiment of the device of the present invention, and Figures 2 to 4 are arrows 1-- in Figure 1.
FIG. 4 is a cross-sectional view taken along line F during operation; FIGS. 2 and 3 are cross-sectional views at the lower inverted position, and FIG. 4 is a cross-sectional view at the lower inverted position. 5 and 6 are a perspective view of the lever and a joint used in the first embodiment, FIG. 7 is a perspective view showing the state in which the lever and the cylinder are assembled, and FIG. 8 is a perspective view of the lever and the joint used in the first embodiment. 7, FIGS. 9 and 10 are perspective views of the wiper link rod portion and crank arm (35) portion of the first embodiment, and FIGS. 11(A) and 10 are FIG. 11(B) is a perspective view of the lever, rod, and crank arm portions in a second embodiment, which is a partially modified version of the first embodiment. FIG. 12 is a skeleton diagram schematically showing the link motion of the wiper device of the first and second embodiments, and FIG. 13 is the rotation of the eccentric bushing in the winter season in which the cylinder head is connected to the rod side in the first embodiment. 14 is a sectional view showing the third embodiment of the present invention; FIG. 15 is a perspective view of the cylinder 15 used in the third embodiment; FIG. 16 is a schematic diagram for explaining the trajectory;
18 to 18 are cross-sectional views illustrating each operating state in the fourth embodiment of the present invention, and FIGS. 19 to 21 are a partial perspective view of the lever and a perspective view of the rod used in the fourth embodiment, respectively. FIG. 2 is a perspective view of the crank arm. 22 to 24 are cross-sectional views illustrating each operating state in the fifth embodiment of the present invention, FIG. 25 is a bottom view of the device shown in FIG. 24, and FIGS. 26 and 27 are the fifth embodiment. FIG. 26 is a perspective view of the vicinity of the rod, and FIG. 27 (36) is a perspective view of the vicinity of the crank arm. FIG. 28 is a partial perspective view of the lever in the sixth embodiment, which is a partial modification of the fifth embodiment, and FIGS. 29 to 31 are cross-sectional views illustrating each operating state in the seventh embodiment of the present invention. , FIG. 32 is a partial plan view in the winter state in which the eccentric bushing is connected to the rond side in the lower inverted position, and FIG. 33 is a cross-sectional view taken along arrows N--N of the FIG. 32 portion. 11... Drive shaft, 7... Crank arm. 1... Crank pin, 3... Eccentric bushing, 2...
・Case, 10...Wiper link rod, 30...
Wiper blade, L3...lower inverted position, L2. L3・
...Lower inverted position, 4...lever. Representative patent attorney Takashi Okabe (37) Special opening H59-53255 (13) Figure 16 Figure 26 Figure 28 e1 @ Figure 29 0 Ja

Claims (1)

[Claims] (1) Drive shirt 1- that continuously rotates in one direction.
(11), a crank arm (7) fixed to the drive shaft and rotating together, a crank bin (1) fixed on the crank arm (7), an M crank pin (1)
an eccentric bush (3) rotatably attached to the crank bin (1) and having a central axis (C) eccentric to the central axis of the crankshaft (C);
, a case (2) rotatably attached to the eccentric bush (3), and a wiper that is fixed to the case (2) and does not reciprocate from side to side as the crank arm (7) rotates. The link rod (10), the wiper link rod (
A wiper blade (10) is connected to the wiper blade (
30) The wiper link rod (10) is integrated with the eccentric bushing (3) and is rotatable together with the eccentric bushing (3) around the crankshaft (1).
) side or the crank arm (7) side, thereby changing the lower reversal position (Ll, L2) of the wiper blade (30) in at least two stages. A vehicle wiper device featuring: (2. In Claim 1, the lever (4)
) and the wiper link rod (lO) are connected by a rotatable joint (lO) provided at the tip of the lever (4).
5) into the wiper link rod (10) side, and the lever (4) and the crank arm (7) are connected by fitting the joint (15) into the crank arm (7) side. A wiper device for a vehicle, which is characterized in that the wiper device operates by wiping the wiper. (3) In claim 1, the lever (
4) is characterized in that the lever (4) is made of a highly elastic material and is selectively engaged with the upper wiper link rod (lO) side and the lower crank arm (7) side by deforming the lever (4). Vehicle wiper (2) device. (4) In claim 1, the lever (
4) is a slider (4e) which is connected to the eccentric bushing (3) and is slidable approximately in the radial direction of the eccentric bushing.
), and by sliding the slider (4e), the eccentric bushing (3) is inserted through the slider (4e).
A wiper device for a vehicle, characterized in that the wiper link rod (10) is connected to the wiper link rod (10) or the crank arm (7).