JPS6240842Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper drive device, and more particularly to a drive case of a wiper device.

Generally, the drive unit case contains a power source such as a motor, various gears, arms, etc. that make up the power transmission mechanism.
A large number of parts such as the shaft, bearings for holding these parts, spacers, arm reversal stoppers, etc. are organically built-in. Conventionally, a stopper such as an E-ring is used to securely hold the main shaft. In this way, a large number of parts can be processed accurately without making any mistakes in the order, and without any gaps.
Moreover, it was extremely difficult to assemble efficiently and quickly.

In view of the above points, it is an object of the present invention to provide a wiper drive device that allows built-in components to be assembled accurately, reliably, and quickly.

The feature of the present invention is that a protrusion is formed on the inner surface of the lid of the drive unit case, and the protrusion functions as a presser for internal components and a reversal stopper.
Built-in components can be held securely by simply closing the lid, and the number of parts such as spacers and stoppers can be reduced to improve ease of assembly.

Hereinafter, an embodiment in which the present invention is applied to a wiper device will be explained with reference to the accompanying drawings. FIG. 1 is an overall view of the wiper device. The wiper device can be roughly divided into a blade section 2 that rubs and cleans the windshield 1, an arm section 3 that supports and operates the blade section 2, and a drive section 4 that is a power source. Thus, the reciprocating rotational motion generated from the drive section 4 causes the blade section to perform a predetermined reciprocating sliding motion. The drive unit 4 uses a drive unit case 5 according to the present invention.

Next, the arrangement of each component inside the drive unit case 5 will be explained with reference to FIG. 2. FIG. 2 is a schematic diagram showing various parts housed in a box-shaped case part (not shown) and a lid 6 that covers the case part. A driving motor 7 is connected to a worm shaft 8 and installed behind the lid 6. A gear 9 meshes with the wormshaft 8, and a spur gear 11 disposed nearby meshes with a gear 10 that is coaxially connected to the gear 9 and rotates in conjunction with the gear 9, so that the rotational speed of the motor 7 is changed. The signal is transmitted to spur gear 11. The spur gear 11 and the first arm 12 are connected, and a second arm fixed to the main shaft 14 is connected to the spur gear 11 and the first arm 12.
The arm 13 is connected, and the rotational movement of the spur gear 11 is converted into the reciprocating rotational movement of the main shaft 14. A terminal 15 is attached to the motor 7.

Here, each protrusion according to the present invention will be explained. In FIG. 2 and FIGS. 3a and 3b, the cylindrical projection 16 serves as a presser for the main shaft 14, and the nearby prismatic projection 17 serves as a stop for the arm unit to reverse, and the prismatic projection 1
8 is provided as a presser for the terminal 15. The protrusion 19, which is a combination of a cylinder and a prism, also serves to prevent the arm from reversing, and three oblong protrusions 20 provided in the form of shelves on its side function as a yoke to support the motor. An arc-shaped protrusion 21 provided a little apart from these protrusions acts as a presser for the spur gear 11, and a prismatic protrusion 22 provided near the protrusions 21 serves as a presser for the spur gear 11.
serves as a presser for the tip of the wormshaft 8.
In addition, although not according to the present invention, the rib 23, the bearing hole 24 of the gear shaft, and the holding recess 25 of the motor 7
etc. are also provided. FIG. 4 shows a state in which the protrusions described above hold built-in components. In FIG. 4, the parts to be held and the drive unit case body 5a are shown in broken lines. The case body 5a has protrusions 5b for positioning and supporting built-in components, etc.
It is also formed integrally with the main body 5a, and the built-in components are held between these protrusions and the protrusion extending from the lid 6 described above. For example, the worm shaft 8 is supported by a protrusion 5b extending from the main body 5a, and is held and held by a prismatic protrusion 22 extending from the lid according to the present invention. When assembling parts into the drive unit case as described above, the assembly work is completed by first loading the parts into the positions determined by the protrusions and holes provided on the main body, and then covering the lid with the invention. , work progresses smoothly and quickly.

Note that resin was used as the material for the drive unit case in this embodiment in order to reduce the weight of the case, but since there may be cases where the number of protrusions is increased or the shape becomes complicated, resin is not used as the material in this invention. Useful.

As described above, with the present invention, the number of parts built into the drive unit case can be reduced, and since secondary fasteners such as E-rings are not used, parts can be reliably and quickly with only a simple loading operation. can be incorporated, greatly improving assembly work efficiency.

[Brief explanation of drawings]

FIG. 1 is an overall explanatory diagram of the wiper device, FIG. 2 is a schematic diagram of the inside of the drive device of the wiper device viewed from the back of the lid, and FIGS. 3a and 3b are a plan view and a sectional view of the lid, FIG. 4 is a schematic vertical sectional view showing a state in which parts are housed in the drive unit case. Explanation of symbols, 4: Drive unit, 5: Drive unit case,
5a: case body, 6: lid, 8: wormshaft, 14: main shaft.

Claims (1)

[Claims for Utility Model Registration] 1. In a wiper drive device in which a wiper drive motor and a power transmission mechanism are housed in a drive unit case having a case body and its lid, the lid is connected to the wiper drive motor and the power transmission mechanism. A wiper drive device characterized in that projections are provided on the inner surface at predetermined positions corresponding to each arrangement position of the wiper drive device. 2. The utility model registration claim 1 is characterized in that the protrusion is provided so as to fix the wiper drive motor and the power transmission mechanism within the drive unit case when the lid is placed over the case body. The wiper drive device according to item 1. 3. The wiper drive device according to claim 1, wherein the protrusion is provided to prevent the power transmission mechanism from reversing when the lid is placed on the case body. 4. The driving unit case is made of resin, and the lid and the protrusion are integrally molded, as described in any one of claims 1 to 3 of the registered utility model claim. wiper drive device.