JPS6345400Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wiper drive device, and in particular to a wiper drive device that has been improved so that a drive motor can be quickly and easily attached to the housing of the drive device with a simple configuration. be.

Wipers used for automobile windows, mirrors, headlights, etc. generally have a structure in which a wiper shaft supporting a wiper blade is automatically driven to reciprocate and rotate. For this reason, a drive device for a wiper is generally constructed by housing a drive motor, a reduction gear mechanism, and a transmission means for converting continuous rotational motion into reciprocating rotational motion in a housing.

In conventional wiper drive devices, the motor is generally fixed to the housing using mechanical fastening members such as mounting screws, and electrical wiring is connected to supply power to the motor. Ta. For this reason, when installing the motor, it is necessary to perform both mechanically fixing the motor and electrically connecting it, which requires a lot of time and effort. In addition, since the first stage reduction gear of the reduction gear mechanism is fixed to the motor shaft, high precision is required for positioning and fixing the motor in order to maintain a normal meshing state between the main gear and its receiving gear. . This makes the means for attaching the motor complicated and expensive, and also increases the number of assembly steps.

The present invention was developed in view of the above circumstances, and has a simple structure that allows the motor to be installed quickly and easily.Moreover, the reduction gear attached to the motor shaft can be operated normally relative to the receiving gear that meshes with it. It is an object of the present invention to provide a wiper drive device that can maintain proper engagement.

In order to achieve the above object, the wiper drive device of the present invention has a shaft hole in the first stage deceleration worm and is fitted to the motor shaft, and a pivot ball is provided on the tip side of the worm, and the housing A pivot ball holder is provided inside the housing to rotatably support the pivot ball, and a terminal for receiving power is protruded from the motor, and a spring piece for holding the terminal for receiving power is provided inside the housing. The motor can be positioned and attached to the housing by fixing the power supply terminal, and by coupling the pivot ball and the pivot ball holder, and coupling the power reception terminal and the power supply terminal. It is characterized by having been configured.

Next, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a partially cutaway front view of the lid 2 of the housing 1 in an example of the wiper drive device of the present invention, in which 3 is a motor, 4 is a worm attached to the shaft of the motor, 5 is a worm foil that meshes with the worm.

FIG. 2 is a sectional view taken along the line XX shown in FIG. 1, and FIG. 3 is an exploded perspective view showing the motor 3 and its supporting members.

A shaft hole 4a having a D-shaped cross section and a required depth is provided from the input end of the gear reduction mechanism, that is, the root side of the worm 4 constituting the first stage reduction gear.
A is D-cut and the two are fitted together to allow sliding in the axial direction and to transmit rotation.

A pivot ball 4b is integrally formed on the tip side of the worm 4.

On the other hand, a support column 1a is integrally planted on the bottom surface of the housing 1, a printed wiring board 7 is attached thereto, and the support column 1a is fixed with a mounting screw (not shown). A pivot ball holder 8 is fixed to the printed wiring board 7, which rotatably fits into the pivot ball 4b. The above-mentioned pivot ball holder 8 is made of a synthetic resin having spring elasticity and includes a plurality of spherical spring pieces 8 that hold the pivot ball 4b.
A, 8a... are integrally molded, and the pivot ball 4 can be moved by hand.
When b is pressed against the spherical seat of the pivot ball holder 8, the spring pieces 8a, 8a are bent so that they can be easily fitted together.

Separately from the above, power receiving terminals 9 are protruded and fixed to the main body of the motor 3. Then, on the printed wiring board 7, the power receiving plug terminal 9,
Terminals 10 and 10 for power supply, which are made of spring pieces that respectively hold 9, are fixed.

As shown in FIG. 2, wiring 6 for supplying power to the motor 10 and for controlling the motor is arranged below a printed wiring board 7. As shown in FIG. With this configuration, there is no risk that the wiring 6 will interfere with the reduction gear and interfere with the operation of the gear, or that the wiring coating will be damaged.

When assembling the wiper drive device configured as described above, align the shaft hole 4a of the worm 4 with the motor shaft 3a.
Fit the pivot ball 4b into the pivot ball holder 8.
At the same time, press and fit the two power receiving terminals 9, 9 onto the power feeding terminals 10, 9, respectively.
Push it into 10 and hold it in place. This operation can be performed quickly and easily without the need for a separate jig or tool, thereby simultaneously achieving the positioning and fixing of the motor 3 and the electrical connection. Moreover, since the tip of the worm 4 is supported by the pivot ball 4b and the pivot ball holder 8, the worm 4
The meshing relationship between the worm wheel 5 and the worm wheel 5 is easily maintained with high precision.

As described in detail above, by applying the present invention, the motor can be positioned and mounted quickly and easily with a simple configuration, and the reduction gear attached to the motor shaft can be positioned relative to the receiving gear meshing with it. The excellent practical effect of maintaining a normal meshing relationship with high precision can be obtained.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the wiper drive device of the present invention, FIG. 1 is a front view with a part of the lid of the housing cut away, and FIG. 2 is the same as shown in FIG. 1. FIG. 3 is an exploded perspective view of the motor and its attachment-related members. 1...Housing, 2...Housing lid, 3
...Drive motor, 3a...Coaxial, 4...Worm, 4a...Shaft hole, 4b...Pivot ball, 5...
Worm foil, 6...Wiring, 7...Printed wiring board, 8...Pivot ball holder, 9...Terminal for power reception, 10...Terminal for power supply.

Claims (1)

[Scope of utility model registration request] In a wiper drive device in which a wiper drive motor and a reduction gear mechanism are housed in a casing, a shaft hole is provided in the input worm of the reduction gear mechanism to fit the motor shaft, and a A pivot ball is provided, a pivot ball holder is provided inside the housing to rotatably support the pivot ball, a terminal for receiving power is provided protruding from the motor, and the plug terminal is provided inside the housing. The motor is connected to the housing by fixing the power supply terminal consisting of a spring piece that clamps the motor, and by coupling the pivot ball and the pivot ball holder, and coupling the power reception terminal and the power supply terminal. A wiper drive device characterized by being configured so that it can be positioned and installed.