JPS5996031A - Wiper device for car - Google Patents

Abstract

PURPOSE:To allow a wiper blade to be stopped at an optional position by constituting a drive motor feed switch with a terminal deenergizing the wiper blade immediately before it reaches a lower reverse position and a terminal deenergizing it immediately before the operation of a connection means becomes possible. CONSTITUTION:When a connection means 13 is rotatably fitted to a crank shaft 10 on a crank arm 6 rotated by a motor 8 of a wiper device through a drive shaft 7, a rance 15 of the connection means 13 is moved, and a lug 18 on the rance 15 is coupled with a stopper piece 20 provided on the end of a wiper link rod 5, the relative rotation of an eccentric bush 11 against the rod 5 is blocked. In this case, the motor 8 is energized through a switch 28, which is constituted with a switch operation section 29 switching to the high speed, low speed, and stop, a stop position selection operation section 30 setting a stop at the upper and lower reverse positions, and cam plates 31, 32 interlocked with the motor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper device for an automobile, and more particularly to a wiper device for an automobile that can change the downward inversion position of a wiper blade.

As this type of automobile wiper device, the one filed by the applicant of the present invention on September 22, 1980 (
Hereinafter referred to as the proposed invention. ).

Conventionally, in the case of retractable wipers in which all or part of the wiper blade is stored inside the vehicle hood when the wiper is not in use, there are two types: the so-called rise-up type, which moves the wiper blade from the retracted position to the lower inverted position when the wiper is activated, and the so-called rise-up type, in which the wiper blade is moved from the retracted position to the lower inverted position when the wiper is activated. Two types of wiper blades were commonly used: a type in which the reversing position is the storage position, and the former type requires a complicated mechanism to raise the wiper blade, while the latter type requires a complicated mechanism to raise the wiper blade when snow accumulates in the wiper blade storage space. There was a problem that the operation of the blade could be hindered.

Therefore, in the proposed invention, the lower reversal position of the wiper blade can be changed by the following configuration.

1 to 4, the wiper blade 1 swings around the hot portion 2 to wipe the surface of the front window 3, and the wiper blade 1 includes a lever 4, a wiper link rod 5. A crank arm 6° is connected to a motor 8 via a drive shaft 7. Motor 8 is drive shaft 7
By rotating the crank arm 7, the crank arm 6 is rotated, and at this time, the wiper link rod 5 is reciprocated in the left-right direction. As the wiper link rod 5 reciprocates, the lever 4 swings back and forth, causing the wiper blade 1 to swing back and forth along the surface of the windshield 30. The wiper link rod 5 and the drive shaft 7 are rotatably connected by a rotating pin part 9 shown in FIGS. 2 to 4, and the wiper blade 1 is rotated downwardly at the rotating pin part 9. This is because the position can be changed.

2 to 4, a crankshaft 10 is protruded from the tip of the crank arm 6 in parallel with the drive shaft 7, and an eccentric bushing 11 is provided at the crankshaft 1°.
is rotatably fitted. The eccentric bushing 11 is a rotating body about a central axis C that is eccentric with respect to the crankshaft 10, and its outer shape is formed into a spherical shape. A case 12 having a spherical inner surface is rotatably fitted around the outer periphery of the eccentric bush 11, and the wiper link rod 5 is fixed to the outer periphery of the case 12. A connecting means 13 for connecting the eccentric bushing 11 to the wiper link rod 5 or the crank arm 6 is rotatably attached to the crankshaft 10. Relative rotation of the lance 15 with respect to the eccentric bushing 11 is prevented by the installed lance 15, a stay 17 provided with a protrusion 16 that penetrates the elongated hole 14 and enters the eccentric bushing 11, and the protrusion 16. is being prevented. A projecting piece 18 that projects toward the crank arm 6 is provided at one end of the lance 15, and a recess 19 into which the projecting piece 18 can be engaged is formed at the tip of the crank arm 6. On the other hand, a stopper piece 20 is provided at the rear end of the wiper link rod 5 so as to protrude toward the crank arm 6, and the stopper piece 20 can be engaged with the end of the lance 15 where the projecting piece 18 is provided. A convex portion 21 is formed. The lance 15 is movable in the extending direction of the elongated hole 14, and by this movement, the protrusion 18 is engaged with the recess 19 (FIG. 2), or the protrusion 21 is engaged with the stopper piece 20. (Figures 3 and 4).

When the convex portion 21 is engaged with the stopper piece 20, the eccentric bush 11 is connected to the wiper link rod 5, and relative rotation with respect to the wiper link rod 5 is prevented. At this time, the central axis C of the eccentric bushing 11 is
The wiper blade 1 is always located closer to the rear end of the wiper link rod 5 than the center of the wiper link rod 5, and as shown in FIG. 5, the lower reversal position of the wiper blade 1 is set at a relatively high position Ll. Also, the protrusion 18
When engaged in the recess 19, the eccentric bush 11 is connected to the crank arm 6, and relative rotation with respect to the crank arm 6 is prevented. At this time, as shown in FIG. 5, the lower reversal position is set to the lower position Ll, and the lower reversal position 3 remains unchanged.

In this way, it is possible to change the lower reversal position by switching the connecting means 13.

An object of the present invention is to further develop such a proposed invention and to provide a wiper device for an automobile in which the switching operation of the connecting means can be easily performed.

In the automobile wiper device according to the present invention, power is supplied to the motor that rotationally drives the drive shaft via a switch that operates in synchronization with the rotation of the motor, and the switch is supplied with power immediately before the wiper blade reaches the downward reverse position. A terminal for cutting off the power supply and a terminal for cutting off the power supply immediately before the position where the connecting means can be operated are provided, thereby making it possible to stop the wiper blade not only in the downward inverted position but also in the operable position.

Next, an embodiment of an automobile wiper device according to the present invention will be described based on the drawings.

In FIGS. 7 to 11, the automobile wiper device is attached to the surface of the cowl 22 of the vehicle near the 7-door 23, and the cowl 22 is provided with a wiper device mounting hole 24 and a working hole 25. ing. The motor 8 is connected to the drive shaft 7 via a reducer 26, and the reducer 26 is connected to the mounting hole 2.
It is attached to 4. The working hole 25 is arranged in a position where it is not blocked by the motor 8 or the reducer 26, and the working hole 25 is
The position corresponds to the position of the fourth part 19 and the stopper piece 20 when the wiper blade l is in the epithelial displacement position L3. Therefore, as shown in FIG. 9, by inserting the driver 27 through the working hole 25, the lance 15 can be driven by the protruding piece 16, and the lance 15 can be moved as far as the recess 19'i into the stopper piece 2.
0. Thereby, the lower reversal positions LL and L2 of the wiper blade 1 can be switched.

In order to perform such switching, it is necessary to stop the wiper device at the epithelial transition position L3, and the motor 8 has a first
Power is supplied via a switch 28 shown in FIGS. 2 and 13, so that stop position control can be performed.

The switch 28 includes a switching operation section 29 that switches between high-speed operation, low-speed operation, and stop of the wiper device, a stop position selection operation section 30 that selects whether to stop at the epithelial reversal position or the downward reversal position, and the motor 8. cam play) 31.32. The switching operation unit 29 is connected to a terminal B connected to the battery 35 via a fuse 33° ignition switch 34, a terminal +1 connected to a low speed rotation terminal +1 of the motor 8, and a high speed rotation terminal +2 of the motor 8. and a terminal +S connected to the stop position selection operation section 30.
When 9 is set to high-speed operation position HIGH, terminals B and +2 are connected. When set to low-speed operation position LOW, terminals B and +1 are connected, and when set to stop position OFF, terminals +S and +1 are connected. Ru.

The cam plate 31 is formed into a substantially disk shape, and the cam plate 32 is formed into a substantially annular shape surrounding the cam plate 31. A fan-shaped notch 36 is provided on the inner periphery of the cam plate 32.
is formed, and the cam plate 31 is formed with a fan-shaped projection piece 37 that enters into this notch 36. A common contact 38 is located outside the notch 36 of the cam plate 32.
are in sliding contact with each other, and a lower inversion position stop contact C1 and an epithelial inversion position stop contact C2 are arranged in sliding contact with each other at a position inside the notch 36 of the cam plate 32 with a phase difference of 180 degrees. The cam plate 31 is grounded together with the ground terminal of the motor 8, and is connected to the contact C via the protruding piece 37.
1 or C2.

The stop position selection operation section 30 selectively connects the contact C1 or C2 to the terminal +S of the switching operation section 29, while the common contact 38 is connected to the terminal B of the switching operation section 29.

The protruding piece 37 contacts the contact C1 when the wiper blade 1 is in the downward inversion position, and contacts the contact C2 when the wiper blade 1 is in the epithelial inversion position.

When stopping at the lower reverse position, stop position selection operation section 3
0 connects contact C1 to terminal +S. In this state, when the wiper is operated by the LOW or HIGH position and then switched to the 0FFK position, when the wiper blade 1 is not in the lower reversed position, the contact M and the cam plate 32. Power is supplied to the motor 8 via the contact CI and terminals +S and +1, and the rotation of the motor 8 is maintained. After that, when the wiper blade 1 reaches the downward inverted position, the contact C1
is separated from the cam plate 32 and comes into contact with the protrusion 37 of the cam plate 31. Then, the ground terminal of motor 8 and terminal +
1 are the terminals +i, +s of the switching operation section 29, the contacts ci,
The motor 8 is connected via the cam plate 31, and the motor 8 is suddenly stopped by the back electromotive force. This ensures that the winding blade 1 stops at the lower reversed position.

When stopping at epithelial translocation, stop position selection operation section 3
0 connects contact C2 to terminal +S. In this state, position L O'W 'l: 7"c is i ■ I G
When the wiper is operated by H and then switched to the OFF position, when the wiper blade 1 is not in the upper reverse position, the contact 38. Cam plate 32. Contact C2, terminal +S
, +1, and the motor 8 continues to rotate. Thereafter, when the wiper blade 1 reaches the upper inverted position, the contact C2 separates from the cam plate 32 and comes into contact with the protrusion 37 of the cam plate 31. Then, the ground terminal of the motor 8 and the terminal +1 are connected to the terminal +1. +S, contact CI, and the cam plate 31 are connected, and the motor 8 is suddenly stopped by the back electromotive force. As a result, the wiper blade 1 is reliably stopped at the upper reversal position and can be switched between the lower reversal positions Ll and L2.

As mentioned above, the automobile wiper device according to the present invention includes:
Power is supplied to the motor that rotationally drives the drive shaft through a switch that operates in synchronization with the rotation of the motor, and this switch has a terminal that cuts off the power supply just before the wiper blade reaches the lower reverse position, and a terminal that operates the coupling means. A terminal is provided to cut off the power supply just before the position where the wiper blade can be operated, making it possible to stop the wiper blade not only in the downward reverse position but also in the operable position, which has the excellent effect of making it easier to operate the connecting means. .

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an overall configuration diagram showing the proposed invention which is the premise of this invention, and Figs. 2 to 4 are cross-sectional views taken along the line of arrow F-F in Fig. 1 during operation. FIGS. 2 and 3 are sectional views at the bottom inverted position, and FIG. 4 is a sectional view at the top inverted position. FIG. 5 is a skeleton diagram schematically showing the link motion of the proposed invention, and FIG. 6 is a schematic diagram illustrating the rotation locus of the eccentric bushing during winter in which the joint is connected to the rod side in the proposed invention. Fig. 7 is a front view showing an embodiment of the wiper device according to the present invention (C), Fig. 8 is a plan view of Fig. 7, Fig. 9 is an enlarged view of Fig. 8, and Fig. 10 is an enlarged view of the same embodiment. Perspective view showing the mounting part, 1st
FIG. 1 is an exploded perspective view showing the mounting manner of the same embodiment, FIG. 12 is a circuit diagram showing the power supply circuit of the motor in the same embodiment, and FIG. 13 is a cam pattern diagram of the motor switch of FIG. 12. 1... Wiper blade, 2... Pivot part. 3...Front window, 4...Lever,
5... Wiper link rod, 6... Crank arm. 7°°°drive shaft, 8...motor,
9... Rotating pin portion, 10... Crankshaft, 11... Eccentric bushing, 12... Case, 13... Connecting means, 14... Long hole,
15...Lance, 16...Protrusion piece, 17...
・Stay, 18... protrusion, 19... recess,
20... Stopper piece, 21... Convex portion. 22...cowl, 23...hood, 24.
...Wiper device mounting hole, 25...Working hole, 2
6...Reducer. 27...driver, 28...switch, 2
9...Switching operation section, 30...Stop position selection operation section. 31.32...come play), 33...huyuse. 34...Ignition switch, 35...Battery, 36...Notch, 37...Protrusion piece,
38... Common contact point 1゜ Agent Tatsuyuki Unuma (and 2 others) Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 6 Figure 9 Figure 11? 50 pieces

Claims (1)

[Claims] (1) A drive shaft connected to a motor, a crank arm protruding from the drive shaft in a radial direction, a crank shaft protruding from the tip of the crank arm in parallel to the drive shaft, and a crank arm protruding from the drive shaft in parallel to the drive shaft. A rotatably fitted bushing which is a rotating body about a central axis eccentric to the crankshaft, a case rotatably fitted around the outer periphery of the eccentric bushing, and a bushing protruding from the outer periphery of the case. and a wiper link rod that reciprocates with force as the crank arm rotates, and a wiper link rod that is rotatably connected to the wiper link rod and swings about a predetermined fulcrum to move the windshield surface of the vehicle from the top inverted position to the bottom. In the wiper device for an automobile, the wiper device includes a wiper blade that wipes the wipe over a range up to a reverse position, and a connecting means that connects the eccentric bushing to a crank arm or a wiper link rod in a manner that prevents relative rotation. Power is supplied through a switch that operates synchronously, and the switch is provided with a terminal that cuts off the power supply just before the lower reversal position and a terminal that cuts off the power supply just before the position where the coupling means can be operated. A wiper device for an automobile characterized by a wiper device.