JPH0348053B2 - - Google Patents

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).

However, when the wiper is operated, the wiper blade rises from the retracted position to the lower inverted position (rises up) and then wipes the area between the lower inverted position and the upper inverted position.
It has a complex mechanism called a rise-up mechanism.

Therefore, this type of wiper device is expensive.
Therefore, it is desirable to hide all or part of the wiper blade from the driver's view when the wiper is not in operation without having a rise-up mechanism.

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, while the wiper motor is operating,
Because the wiper blade always reaches the downward inverted position,
If snow accumulates on the underside of the window in winter, the snow may prevent the wiper blade from descending while the wiper motor is energized, causing damage to the wiper blade, wiper link rod, or wiper motor, or an overload failure. There was a drawback that there was.

Therefore, there is a need for a wiper device for a vehicle that does not cause damage or failure as described above even if the movement of the wiper blade is restricted in the vicinity of the lower inversion position. It's about doing.

Hereinafter, one embodiment of the present invention will be described in detail using FIGS. 1 to 6. A drive shaft 5 serves as a drive shaft for the wiper motor, and a crank arm body 6 in which a crank pin 1 is fitted is integrally assembled to the shaft 5 by brazing. Further, a worm gear 17 is fastened to the shaft 5 by a nut 11 and is integrated therewith.

A gear 7 made of a resin material is rotatably attached to the end of the crank arm 6 of the drive shaft 5 on the main body side. Further, a recess 12a (FIG. 3) of the slider 12 made of aluminum die-casting is inserted into the worm gear 17 side of the shaft 5.
24 is a circlip that prevents the drive shaft 5 from coming off. Reference numeral 10 denotes a change shaft, which is rotatably assembled into the through hole of the drive shaft 5, and the bent portion 10a at one end is fitted into the groove of the gear 7 and engaged with the gear 7, and the other end 10b is connected to the gear 7. A portion is cut out and engaged with the slider 12.

That is, the other end 10b of the change shaft 10
has a D-shaped cross section with a notch, and the other end 10b is inserted into the through hole of the slider 12. Therefore, as shown in FIGS. 2 and 3, the slider 12 is movable up and down with respect to the chain shaft 10, but the slider 12 is designed such that it can rotate integrally with the chain shaft 10. are in an engaged state.

A knob 13 made of die-cast aluminum is rotatably attached to the slider 12 by a rivet 15. 14 is a stopper made of a steel plate.

The cover 19, which is integrated with the wiper motor housing 20 and screws 21, and the stopper 14 are integrated by spot welding, and the stopper 14 has a groove 1 at its tip that allows the knob 13 to be hooked and fixed.
It has 4a. A compression spring 16 is provided between the stopper 14 and the slider 12 so as to press the slider 12 against the drive shaft 5.

In Figure 2, where the bottom inversion position is quite low,
The combined length m of the slider 12 and the drive shaft 5 during the summer when the knob 13 is in the solid line state, the slider 12
The relationship between the joint length n of the change shaft 10 and the stroke l of the slider 12 is n>l>m.

22 is a waterproof case that is fitted into the stopper 14. 3 in the upper part of FIG. 2 is an eccentric bush made of oil-impregnated sintered metal. This bushing 3 is made of a resin material and is integrally formed with a pinion 4 having a tooth ratio of 1:1 to the gear 7 by convex-concave fitting, thereby forming eccentric bushings 3 and 4.

The eccentric bushing portions 3 and 4 are rotatably attached to the crank pin 1 by a snap spring 25. Reference numeral 2 denotes a conventionally well-known resin case integrally molded with the rod 26, and is rotatably inserted into the eccentric bush 3. Reference numeral 8 denotes an idle gear for making the gear 7 and pinion 4 as small as possible, which together with the gear 7 constitutes the gear portions 7 and 8. This gear 8 is rotatably attached to the pin 9 by a snap spring 18. Note that the pin 9 is fixed to the crank arm body 6. A cover 23 is made of a resin material and protects the gear, and is integrally attached to the crank arm 6 via a claw 23a.

With the above configuration, in the summer, the knob 13 is in a state where it is disengaged from the groove 14a of the stopper 14, that is, the second
In the solid line state in the figure, the chain shaft 10 is engaged with and integrated with the slider 12, and the slider 12
is integrated with drive shaft 5, so gear 7
is integrated with the drive shaft 5 via the change shaft 10 and slider 12.

Therefore, via the idle gear 8, the pinion 4
Since the eccentric bushing 3 which is integrated with the drive shaft 5 is also connected integrally with the drive shaft 5, the substantial central axis C of the eccentric bush 3 is centered on the center point B of the drive shaft 5 and has a radius ( A+
When the wiper blade reaches the upper reversal position, it will be in the state shown in Figure 4.

On the other hand, in winter, when the wiper blade linked to the crank arm 6 is at the lower end of the window glass, that is, at the lower inverted position, the knob 13 is pulled downward in FIG. 2 to lower the slider 12 (lower by the dimension l). After disengaging from the drive shaft 5, if the slider 12 and, by extension, the change shaft 10 that is engaged with this are rotated 180 degrees, the slider 12, change shaft 10, gear 7, idle gear 8, and pinion 4 can be rotated. Since the eccentric bush 3 rotates 180 degrees with respect to the crank pin 1 through the rotation, the center of the eccentric bush 3 is shifted by 2×ΔA, and the link rod 26 is shifted by that amount. Since the wiper arm is pulled in the direction of the arrow X in FIG. 3, the lower inverted position of the wiper arm rises by θ ₁ as shown in FIG.

This will be explained with reference to FIGS. 1, 5 and 6. In FIGS. 1, 5, and 6, 30 is a wiper blade, 31 is a wiper arm, 32 is a pivot portion, 33 is an arm lever, and P ₁ to _{P 4} are connected by a rotatable pin portion. There is. and,
P ₄ is the eccentric pin 1 in Figs. 2 to 4;
Corresponds to 2, 3, 4.

Note that the pin portions P ₁ to _{P 3} consist of simple coupling pins that are not eccentric.

In FIG. 5, when the link rod 26 is pulled in the direction of the arrow X, the arm lever 33 and the wiper arm 3
1 rotates by an angle θ ₁ around the pivot portion 32 to wipe the window surface W.

The lower reversal position of the wiper blade 30, which was previously at position _L1 , becomes position _L2 by rotating by _θ1 . In other words, the lower reversal position changes from L ₁ for summer to L ₂ for winter. Also, upper inversion position
L ₃ is constant and unchanged from before.

This will be further explained below.

In the above, it was described that the knob 13 is pulled and rotated 180 degrees, but after this, if the knob 13 is hooked and fixed on the stopper 14 as shown in FIG. ),
Change shaft 10 is slider 12, knob 1
3. The wiper motor housing 20, slider 12, and shaft 1 are engaged with the wiper motor housing 20 through the stopper 14 and the motor cover 19 and cannot rotate freely, so the wiper motor housing 20, slider 12, and shaft 1 are in the state shown in FIG.
0, gears 7, 8, 4, and bush 3 are all integrated and cannot rotate relative to the motor housing 20.

In this condition, the wiper motor housing 20
As is well known, when the wiper motor (not shown) rotates, the output shaft _M1 of the motor rotates, and since the worm formed on the output shaft _M1 meshes with the worm gear 17, the gear 17 rotates and the gear 17 and An integrated drive shaft 5 rotates. Then, the crank arm main body 6 and the pin 1, which are integral with the drive shaft 5, rotate.

Eccentric bush 3 inserted into pin 1
The drive shaft 5 also rotates (revolutions) around the central axis B of the drive shaft 5.

However, as mentioned above, gear 7 is connected to shaft 10.
Since the wiper motor housing 20 is fixed to the wiper motor housing 20 through the
The relative position of gear 7 and housing 20 does not change. Therefore, the relative positions of the idle gear 8, pinion 4, and eccentric bush 3 connected to the gear 7 do not change with respect to the housing 20, and the eccentric direction (arrow Y in FIG. 3) always remains with respect to the motor housing 20. Since the crank arm main body 6 rotates in the direction of arrow Z in FIG. 6 while remaining in the same direction, the substantial central axis C of the eccentric bushing 3 as shown in FIG.
The locus (thick dot-dash line) is at the center point B (Fig. 3,
(Fig. 6), the radius is from A+△A at the upper inverted position (the position of the link rod 26 shown by the dashed line in Fig. 6) to the lower inverted position (the position of the link rod 26 shown by the solid line in Fig. 6). A of
It becomes a trajectory that moves while gradually changing to -ΔA.

Therefore, the link rod 26 reciprocates from side to side in accordance with the locus of the substantial central axis C of the eccentric bush 3 (thick dot-dash line), so that the lower reversal position of the wiper blade is raised by θ ₁ . Also, the upper inversion position is the dimension between B-C ₁ in Figure 6 is A+△A
Since this is the same as between B and C in FIG. 4, the upper reversal position _L3 is the same in summer and winter, and only the lower reversal position has a smaller wiping angle by _θ1 in winter. Of course, the opposite is also possible.

To summarize the above, if the dimension from the center point B of the drive shaft 5 to the substantial central axis C of the eccentric bush 3 and the central axis of the case 2, which is the center of the connecting part of the link rod 26, becomes A+△A as shown in FIG. In Figure 5, the wiper blade 30 is from L ₁
It wipes out a lot in the range of L ₃ , but if the above dimension is 3rd
When it changes to A-ΔA as shown in the figure, the wiper blade 30 wipes only within the range from _L2 to _L3 in FIG. 5.

This switching can be done by raising the knob 13 upwards as shown in FIG. 2, or by pulling the knob 13 downwards as shown in FIG.
This is done by leaving it in a closed state or by switching it. Note that the waterproof case 22 can be easily attached to the motor body housing 20 by rotating it slightly.
Since it is designed so that it can be attached and detached, all you have to do is remove it and operate the knob 13.

In addition, Fig. 4 shows the drive shaft 5 rotating from the state shown in Fig. 2 and the wiper blade in the upper reverse position.
This is a diagram illustrating the state when L ₃ is reached,
It is shown that the dimension from the center B of the drive shaft 5 to the center C of the cover 2 is still A+ΔA.

In the above embodiment, the pinion 4, idle gear 8, and gear 7 are made of resin material, but they may be made of aluminum die-cast, sintered metal, or the like. Although the eccentric bushing is made of oil-impregnated sintered metal, it may be made of other metal materials or resin materials.

The pinion 4 and the eccentric bush 3 were supposed to be connected by convex-concave fitting, but if they could be integrated,
Any method such as screw tightening may be used, and integral molding is also possible, especially if the material is sintered metal, resin material, etc.

The idle gear 8 may be omitted if the sizes of the pinion 4 and the gear 7 are large, or on the contrary, a plurality of idle gears may be provided.

The ratio of the number of teeth between the gear 7 and the pinion 4 was set to 1:1, but the number of teeth on the gear 7 was set to 2:1, 3:1, etc.
It may be an integral multiple of the number of teeth.

The gear 7 and the change shaft 10 are integrated by fitting the bent portion 10a of the change shaft 10 into the groove of the gear 7, but any method such as screwing, pinning, etc. may be used as long as the integration can be achieved.

In addition, the slider 12 is designed to engage with the drive shaft 5 and rotate integrally with the drive shaft 5 as shown in FIG. 2 during the summer season. It is also possible to provide a structure in which the slider 12 engages with this notch.

Further, although the knob 13 integrated with the winter slider 12 is fixed to the stopper 14, the cover plate 19, motor housing 20, or this wiper device, which is stationary with respect to the rotation of the drive shaft 5, is attached. The knob 13 may be fixed to a part of the vehicle or the like.

The stopper 14 is made of steel plate and the cover plate 19
Although the stopper 14 is spot welded to the plate 19, it is also possible to construct the stopper 14 using another metal material or resin material, and to integrate the stopper 14 and the plate 19 by tightening screws or the like, or to integrally mold the stopper 14 and the plate 19. do not have.

Furthermore, in the above embodiment, when the wiper blade is in the downward inverted position as shown in FIG.
3 by the dimension l, rotate the eccentric bushing 3 180 degrees via the knob 13, the drive shaft 10, and the gears 7, 8, 4, and then
As shown in the figure, the knob 13 is locked to the stopper 14, but if the knob 13 is to be lowered by the distance l when the wiper blade is in the upside-down position as shown in Figure 4, it is not necessary to rotate it 180 degrees. Instead, by locking the knob 13 to the stopper 14, the wiping angle can be switched from the summer wiping angle to the winter wiping angle.

If the wiper blade is to be switched when it is in the upper inverted position (FIG. 4), the rivet 15, spring 16, and knob 13 may also be omitted, and the change lever 10 can be connected to the drive shaft 5. Connect with or stopper 1
Whether or not to connect it to a fixing member such as 4 can be easily switched using screws or the like. However, since the wiper blade must be stopped at the upper reversed position, the known fixed position stopping mechanism must be modified so that the wiper blade stops not only at the lower reversed position but also at the upper reversed position. However, this modification is extremely simple and requires simply changing the shape of the cam switch in the fixed position stop mechanism.

In addition, in the embodiment of the present invention, the rotation pin portion P ₄
refers to the pin 1, case 2, eccentric bush 3, and pin-on 4. Further, the crank arm section 6X refers to the crank arm main body 6, the gears 7 and 8 mounted thereon, and the gear cover 23. Further, the wiper motor M refers to the portion surrounded by the wiper motor housing 20 and the drive shaft 5.

As described above, in the present invention, the wiper blade 30 reciprocatingly wipes the window W from the upper inverted position _L3 to the lower inverted position _L1 or _L2 , and A wiper arm 31 that rotates, a lever 33 and a link rod 26 connected to the wiper arm 31 and forming a link mechanism, and a crank arm 6X that is connected to the link rod 26 via a rotation pin _P4 and drives the link rod 26 back and forth. , in a vehicle wiper device equipped with a wiper motor M that rotates the crank arm portion 6X to reciprocate the link rod 26 and, in turn, the wiper blade 30, from the rotation center B of the crank arm portion 6X to the crank arm portion 6X and the wiper blade 30. Rotating pin part that serves as a connection part and pivot part with the link rod 26
Since the dimension up to the actual central axis C of P ₄ has been changed to two stages, the driver etc. can easily change the wiping range of the wiper blade, that is, the lower reversal position, depending on the summer and winter seasons, for example, and location where the wiper blades and wiper link rods will not be deformed or the wiper motor will not be damaged by overload even if it snows.
The lower inversion position can be set upwards up to L ₂ , which eliminates malfunctions in winter, and in winter or summer when there is no snow, the lower inversion position can be set to the lowest position of the windshield surface L ₁ ( Some vehicles have a window glass that goes below the bonnet).
Since all or part of the wiper blade can be substantially hidden from the driver's view when the wiper is not in operation, the forward view is no longer obstructed by the wiper blade, contributing to safety. Moreover,
A complicated and expensive rise-up mechanism is unnecessary.

Also, when it is in the top inversion position, the rotation center B
Because the drive mechanism does not change the dimension from Can be secured.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the wiper device of the present invention, and FIGS. 2 to 4 are taken along the arrow A--
It is a partial sectional view for each operation along the A line, and the second
The figure shows the wiper blade in the summer season when the wiper blade is in the downwardly inverted position, FIG. 3 shows the wiper blade in the winter season when the wiper blade is in the downwardly inverted position, and FIG.
FIG. 5 is a skeleton diagram schematically showing the operation of the apparatus shown in FIG. 1. Figure 6 is the arrow view D-D in Figure 3.
FIG. 2 is a cross-sectional view schematically showing the revolution of the eccentric bushing in winter. W...window surface, _L3 ...upper inversion position, _L1 ,
L ₂ ...Lower inversion position, 30...Wiper blade,
32...Pivot part, 31...Wiper arm, 3
3...Lever, 26...Link rod, P ₄ ...
Rotating pin part, 6X... Crank arm part, M...
Wiper motor, C...Substantially central axis of rotating pin part, 1...Crank pin, 3, 4...Eccentric bushing part, 2...Case, 5...Drive shaft,
6... Crank arm body, 7, 8... Gear part,
5... Drive shaft, 20... Wiper motor housing, 10... Change shaft.

Claims (1)

[Scope of Claims] 1. A wiper blade that reciprocates to wipe the window surface between an upper inverted position and a lower inverted position, a wiper arm that supports this wiper blade and rotates around a pivot portion, and a link connected to the wiper arm. A lever part and a link rod forming a mechanism, a crank arm part connected to the link rod via a rotation pin part and driving the link rod back and forth;
In a vehicle wiper device equipped with a wiper motor M that rotates the crank arm section to reciprocate the link rod and thus the wiper blade, a wiper motor M rotates the crank arm section to reciprocate the link rod and the wiper blade, and a wiper motor M rotates the crank arm section to reciprocate the link rod and the wiper blade. A drive that switches the dimension of a rotating pin portion serving as a pivot portion to a substantial central axis C in two stages when the wiper blade is in a downwardly inverted position, and does not change the dimension when the wiper blade is in an upwardly inverted position. A wiper device for a vehicle characterized by being provided with a mechanism. 2. The drive mechanism rotates an eccentric bushing constituting the rotation pin portion to switch the direction of rotation, and engages the eccentric bushing with a rotating member of the wiper motor or with a non-rotating member. 2. The vehicle wiper device according to claim 1, characterized in that the wiper device is configured to switch between the wiper device and the wiper device. 3 The rotating pin portion includes a crank pin 1 fixed to the crank arm body of the crank arm portion, eccentric bushing portions 3 and 4 rotatably inserted into the crank pin 1, and the eccentric bushing portions 3 and 4. A case 2 is rotatably inserted on the top and fixed to the link rod 26, and the crank arm part has a crank arm main body 6 fixed to the drive shaft 5 of the wiper motor, and The wiper motor M includes a drive shaft 5 that rotates the crank arm body, and a gear portion 7 and 8 that engages with the eccentric bushing portion and rotates the eccentric bushing portion around the crank pin 1. , a wiper motor housing 20 that rotatably supports the drive shaft 5; one end is fixed to the gear part and rotates together with the gear part, and the other end is connected to the drive shaft 5; a change shaft 1 that is separated from and connected to a member on the wiper motor housing 20 side;
0, and the drive mechanism is comprised of the change shaft 10, the gear parts 7, 8, and the eccentric bush parts 3, 4. The vehicle wiper device described in .