JPH0434128Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a wiper device installed on a front windshield or a rear windshield of a vehicle such as an automobile.

[Technical background of the invention and its problems] It is well known that the front windshield or rear windshield of vehicles such as automobiles is equipped with a wiper device. As shown in FIG. 5, this type of device conventionally has one end of a wiper arm b fitted onto the rotating shaft of a drive motor a that can freely rotate in forward and reverse directions, and a wiper blade C made of rubber attached to the other end. It becomes. The drive motor a reciprocates within a predetermined angle range, and the wiper blade c swings together with the wiper arm b. Wiper blade c is window glass W
It is designed to wipe away rain or snow that falls on the ground.

Therefore, the tip edge of the wiper blade c forms an arcuate wiping locus. On the other hand, since the window glass W forms a substantially trapezoidal surface, both upper end corners in particular remain unwiped by the wiper blade c. In other words, the current situation is that a sufficient driving field of view is not secured.

[Purpose of the invention] The present invention was made with attention to the above-mentioned circumstances, and its purpose is to provide a wiper device that expands the wiping area to the corners of the windshield and secures a sufficient field of view for driving. This is what I am trying to do.

[Summary of the invention] That is, the invention comprises a wiper swinging gear and a wiper advance/retreat gear that are interlocked with a drive motor and have a rotation ratio of 1:2, and a wiper swinging gear and a vehicle body that are rotatably supported. a drive link mechanism that connects the wiper support to the wiper support and urges the wiper support to reciprocate within a predetermined angle range; A wiper slide arm is provided with a rack gear section at the end of the body, and the rack gear section of this wiper slide arm is connected to the gear section for advancing and retracting the wiper, and the wiper slide arm is moved twice each during forward and backward movement of the wiper support. The forward and backward drive mechanism is configured to move the wiper blade forward and backward to expand the wiping range of the wiper blade. A rotating gear coaxially and rotatably supported on a support body and meshing with the arm drive gear, and an auxiliary link mechanism connecting the rotating gear and the wiper advance/retreat gear. This is a wiper device.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 3. In the figure, reference numeral 1 denotes a drive motor having a rotating shaft that is rotatable in one direction, and a worm gear 2 is protruded from this rotating shaft. A wiper swing gear 3 and a wiper advance/retreat gear 4 are rotatably supported on both sides of the worm gear 2 and mesh with the worm gear 2. These wiper swing gears 3
The number of teeth is set so that the rotation ratio of the wiper advance/retreat gear is approximately 1:2. The wiper swinging gear 3 is connected to a wiper support 6 via a drive link mechanism 5, and the wiper advancing/retracting gear 4 is connected to a wiper slide arm 8 via an advancing/retracting drive mechanism 7. The drive link mechanism 5 includes a first link lever 9, one end of which is fitted onto the support shaft of the wiper swinging gear 3, and a link lever between the other end of the first link lever 9 and the wiper support 6. It consists of a second link lever 10 rotatably supported at the end. The wiper support 6 is rotatably supported by a shaft portion 11a of a rotary gear 11 that constitutes a part of the forward/backward drive mechanism 7. It is rotatably fitted onto the support shaft 13. Note that the wiper support 6 may be directly rotatably fitted onto the pivot shaft 13.

Therefore, when the worm gear 2 rotates due to the rotational drive of the drive motor 1, the wiper swing gear 3
As the first link lever 9 rotates, the second link lever 10 rotates to the wiper support 6.
can be reciprocated and rotated around a pivot shaft 13 within a predetermined angular range.

A rack gear portion 8a is provided at one end of the wiper slide arm 8, and is slidably housed within the wiper support 6. The other end protrudes from the wiper support 6, and the wiper blade 14 is attached to this protruding end. It goes without saying that the wiper blade 14 comes into contact with the windshield W of the vehicle. The advance/retreat drive mechanism 7 includes the rotary gear 11, an arm drive gear 18 that meshes with the rotary gear 11, and an auxiliary link mechanism 20 that connects the rotary gear 11 and the wiper advance/retreat gear 4. configured. The rotary gear 11 is rotatably supported coaxially on the wiper support 6, and the arm drive gear 18 meshes with the rotary gear 11.
is also meshed with a rack gear portion 8a formed at the end of the wiper slide arm 8. The auxiliary link mechanism 20 includes a third link lever 15 whose one end is fitted onto the support shaft of the wiper advancing/retracting gear 4.
and a fourth link lever 16 rotatably engaged with the other end of the fourth link lever 16, and a fourth link lever 16 rotatably engaged with the other end of the fourth link lever 16 and fitted onto the shaft portion 11a of the rotary gear 11. and an auxiliary link lever 17.

Therefore, when the drive motor 1 rotationally drives the worm gear 2 and the wiper advance/retreat gear 4 and the third link lever 15 rotate in a predetermined direction, the fourth link lever 16 reciprocates and the auxiliary link lever 17 This causes the rotation gear 11 and the arm drive gear 18 to reciprocate and urge the wiper slide arm 8 to advance and retreat from the wiper support 6. The amount of movement of the wipe pass slide arm 8 can be set by adjusting the gear ratio between the rotary gear 11 and the arm drive gear 18.

When it is necessary to wipe the window glass W, a wiper switch (not shown) is turned on. A drive motor 1 rotationally drives a worm gear 2, and a wiper swinging gear 3 and a wiper advancing/retreating gear 4 that mesh with the worm gear 2 rotate at the same time. The wiper swinging gear 3 urges the wiper support 6 to reciprocate and rotate within a predetermined angle range via the drive link mechanism 5. The wiper slide arm 8 supported by this also rotates and is displaced, but at the same time, it is urged to advance and retreat from the wiper support 6 by the action of the advance and retreat drive mechanism 7. Since the rotation ratio between the wiper swinging gear 3 and the wiper advance/retreat gear 4 is 1:2, the wiper blade 14 is It moves forward and backward twice.

More specifically, as shown in FIG. 4, while the wiper slide arm 8 rotates from one end edge of the windshield W to approximately the center thereof, the wiper blade 14 moves back and forth once. Of this action,
The wiper blade 14 most protrudes approximately at the middle of the rotational movement of the wiper slide arm 8, and corresponds to a corner of the window glass W. Therefore, while the wiper slide arm 8 moves forward or backward, the tip edge of the wiper blade 14 extends to both upper corners of the windshield W and wipes away, resulting in a wide wiping area and expanding the driving field of view. .

Furthermore, the wiper slide arm 8 moves forward and backward while the arm drive gear 18 meshes with a rack gear portion 8a provided at the end of the wiper slide arm 8. The direction of the force that drives the wiper slide arm 8 back and forth coincides with this axial direction, and the wiper slide arm 8 moves back and forth extremely smoothly.

[Effects of the invention] As explained above, according to the invention, the area to be wiped on the windshield can be expanded, a sufficient driving field of vision can be secured, and the wiper slide arm can be moved forward and backward by the arm drive gear and the rack gear part 8a.
Since the process is performed via the , the process is extremely smooth.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a front view of the wiper device, FIG. 2 is a vertical sectional view of the main part, FIG. 3 is a perspective view of the main part, and The figure is an explanatory diagram of a state in which a window glass is wiped, and FIG. 5 is an explanatory diagram of a state in which a window glass is wiped, showing a conventional example of the present invention. 1... Drive motor, 2... Worm gear, 3...
... Wiper swing gear, 4... Wiper forward/backward gear,
6... Wiper support body, 5... Drive link mechanism, 1
4... Wiper blade, 8a... Rack gear part,
8... Wiper slide arm, 7... Advance/retreat drive mechanism, 18... Arm drive gear, 11... Rotating gear, 20... Auxiliary link mechanism.

Claims (1)

[Scope of utility model registration request] The wiper is supported by connecting a wiper swinging gear and a wiper forward/backward gear that are interlocked with a drive motor and have a rotation ratio of 1:2 to each other, and a wiper support that is rotatably supported on the vehicle body. A wiper comprising: a drive link mechanism that biases the wiper body to reciprocate within a predetermined angle range; and a wiper that is supported by the wiper support so as to be movable back and forth, has a wiper blade attached to its protruding end, and has a rack gear portion provided at the end of the wiper support. The slide arm, the rack gear part of this wiper slide arm, and the wiper advancing/retracting gear part are connected, and the wiper slide arm is moved forward and backward twice each during the forward and backward movement of the wiper support to change the wiping range of the wiper blade. The forward and backward drive mechanism includes an arm drive gear that is rotatably supported on the wiper support and meshes with the rack gear portion, and an arm drive gear that is rotatably coaxial with the wiper support. A wiper device comprising: a rotary gear that is pivotally supported and meshes with the arm drive gear; and an auxiliary link mechanism that connects the rotary gear and the wiper advance/retreat gear.