JPH0348923Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seal structure for a wiper drive device, and particularly relates to an improvement of a waterproof seal structure around the output shaft of a wiper drive device. The present invention relates to a seal structure that can be effectively used in a wiper drive device that is fixedly attached to a nearby panel.

[Conventional technology]

When a wiper drive device is attached to a panel near a window glass of an automobile, waterproofing around the output shaft of the wiper drive device is ensured by interposing a sealing member between the panel and the wiper drive device.

[Problem that the invention attempts to solve]

However, in the seal structure of such a wiper drive device, when the ribs of the wiper drive device come into contact with the sealing member, a water collection part is formed on the horizontally installed ribs. There is a problem that rainwater etc. tend to accumulate.

[Means for solving problems]

The seal structure of the wiper drive device according to the present invention is characterized in that a water drainage recess is provided between the contact surface of the rib and the seal member around the output shaft of the wiper drive device so as to communicate the space above and below the rib. shall be.

[Effect]

When rainwater enters the upper surface of the ribs, the rainwater flows downward through the recesses, so that the rainwater does not accumulate on the ribs. Since water does not accumulate around the output shaft, there is almost no risk of water entering the output shaft.

[Example 1] Fig. 1 is an exploded perspective view showing the seal structure of a wiper drive device which is an embodiment of the present invention, and Fig.
FIG.

In this embodiment, the sealing structure of the wiper drive device is configured to ensure a seal for the wiper drive device 2 that is fixedly attached to the panel 1 near the window glass of the automobile. A sealing member is provided between the two. The wiper drive device 2 includes a motor 3 as a drive source, and a gear box 4 having a built-in worm gear reduction device (not shown) is fixedly connected to the motor 3.
One end face of gearbox 4 (hereinafter referred to as the front)
A cylindrical bearing portion 5 is disposed approximately at the center and protrudes approximately at right angles, and an output shaft 6 of a worm gear reduction device is inserted through the bearing portion 5 and rotatably supported. The gearbox 4 has a plurality of mounting legs 7 arranged at appropriate intervals on the outer periphery and protruding outward from the front, and a seat 8 having a substantially C-frame shape is output from the front end of the mounting legs 7. It is arranged so as to be substantially perpendicular to the axial direction of the shaft 6 and protrudes integrally. Thin plate-shaped ribs 9 are installed integrally with the gearbox 4 between each mounting leg 7 and the bearing section 5, and these ribs 9 reinforce the rigidity of the mounting leg 7 and the bearing section 5. ing.

On the other hand, the sealing member 10 is integrally molded into a substantially elliptical shape using an elastic material such as rubber or resin, and a peripheral wall portion 11 is formed on the outer peripheral edge of the sealing member 10 as a ring band having a constant width with an inclination extending outward toward the front. It has a protruding shape. The sealing member 10 has a substantially cylindrical boss portion 1.
2 is arranged so that its center line is substantially perpendicular to the end surface at a position closer to one side of the ellipse, and is formed so as to be able to fit into the bearing portion 5 of the wiper drive device 2. An inclined surface portion 13 is formed at the rear end of the boss portion 12 to be a convex curved surface that expands outward toward the rear, and a grease holding portion 14 is formed at the front end of the boss portion 12 on the outer peripheral surface of the output shaft 6. It is provided in a circular ring shape that protrudes radially inward so as to be able to make sliding contact. On the rear end surface of the sealing member 10, a plurality of rib retainers 15 are arranged radially with respect to the center of the boss portion 12 so as to correspond to each of the ribs 9, and the rib retainers 15 are arranged parallel to each other. The rib 9 is sandwiched between a pair of protruding rectangular protrusions. Further, on the rear end surface of the sealing member 10, a convex portion 16 is arranged at the lower part and protrudes at a constant height, and the convex portion 16 is pressed against the front end side of the corresponding rib 9a. It is configured.

In the sealing member 10, a recess 17 is arranged around the outer periphery of the boss 12 and is formed in an annular shape so as to bulge out to the front side. It substantially constitutes a drainage recess 18 that communicates the upper and lower spaces of the rib 9.

Next, the assembly of the seal structure of the wiper drive device according to this embodiment using the seal member according to the above structure and its operation will be explained.

The seal member 10 is attached to the wiper drive device 2 before the wiper drive device 2 is attached to the panel 1. At this time, the boss portion 1 of the seal member 10
The bearing portion 5 of the wiper drive device 2 is fitted into the wiper drive device 2, and the ribs 9 are aligned with the rib retainers 15, respectively.

This wiper drive device 2 is arranged so that the seal member 10 faces the panel 1 and the output shaft 6 protrudes from the through hole 1a formed in the panel 1 to the opposite side, and is in contact with the panel 2. At the same time, the seats 8 of each mounting leg 7 are fastened to the panel 1 by bolts and nuts 20, respectively.

When the wiper drive device 2 is attached to the panel 1, the rear end surface of the seal member 10 is pressed against the front end surface of each rib 9, and the peripheral wall portion 11 of the seal member 10 is pressed against the front end surface of each rib 9.
The front edge of the panel 1 is pressed against the inner surface of the panel 1. Also,
The boss portion 12 of the sealing member 10 creates a seal by closely fitting the outer periphery of the bearing portion 5, and the grease holding portion 14 of the sealing member 10 tightly fits the outer periphery of the output shaft 6, thereby retaining the grease. 1
9 is held in the space in front of the bearing part 5.

By the way, if the sealing member does not have a recessed portion, the rear end surface of the sealing member presses against the edge of the rib over its entire length. Therefore, the ribs projecting radially from the bearing portion form a water collecting portion whose upper surface is inclined downward toward the bearing portion. As a result, if rainwater or the like infiltrates the upper surface of the rib, there is a risk that the water will accumulate on the rib and infiltrate the bearing.

However, in this embodiment, the seal member 10
Since a water drain recess 18 is formed in an annular shape on the outer periphery of the boss portion 12, water will not accumulate on the rib 9, and there is no risk of water entering the bearing portion 5.

That is, in the event that rainwater or the like enters the upper surface of the rib 9, the water will flow down the slope of the rib 9, collect on the bearing portion 5, and flow into the drainage recess 18 opened there, and drain downward. is drained to.

[Embodiment 2] FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing another embodiment of the present invention.

The second embodiment differs from the first embodiment in that a drainage recess 18A is provided on the outer periphery of the bearing portion 5 in the rib 9A that contacts the rear surface of the seal member 10A.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, the drainage recess is not limited to being provided on the outer periphery of the boss portion of the seal member or the outer periphery of the bearing portion of the rib, but may be provided on the lowermost end of the sloped surface of the rib.

[Effect of idea]

(1) By creating a drainage recess between the abutting surfaces of the rib and the sealing member around the output shaft of the wiper drive device so that the upper and lower spaces of the rib communicate with each other, water intrusion into the upper surface of the rib is prevented. Since the seal member can be discharged downward through the seal member, the waterproof effect of the seal member can be maintained.

(2) By arranging the water drainage recess on the outer periphery of the boss portion of the seal member, the strength of the rib does not need to be reduced.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the seal structure of a wiper drive device which is an embodiment of the present invention, and FIG.
FIG. FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing another embodiment of the present invention. 1... Panel, 2... Wiper drive device, 3...
Motor, 4...Gearbox, 5...Bearing section, 6
... Output shaft, 7 ... Mounting leg, 8 ... Seat, 9 ... Rib, 10 ... Seal member, 11 ... Peripheral wall part, 12
...Boss part, 13...Slanted surface part, 14...Grease holding part, 15...Rib retainer, 16...Convex part, 1
7...Recess, 18, 18A...Drainage recess, 19
...Grease, 20...Boltnut.

Claims (1)

[Claims for Utility Model Registration] (1) In a seal structure for a wiper drive device in which one end surface of a seal member contacts the edge of a rib that projects radially from a bearing, the contact between the rib and the seal member A seal structure for a wiper drive device, characterized in that a drainage recess is provided between the surfaces so as to communicate the upper and lower spaces of the rib. (2) A seal for a wiper drive device according to claim 1, wherein the water draining recess is constituted by a recess formed in an annular shape on the outer periphery of a bearing boss portion of the seal member. structure. (3) The seal structure for a wiper drive device according to claim 1, wherein the water drainage recess is cut into the rib.