JPH0132604Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Industrial Application Field) This invention relates to a wiper drive device for reciprocating a wiper blade in a wiper device for an automobile, for example.

(Prior Art) As a conventional wiper drive device, there is one having a structure shown in FIGS. 5 and 6, for example.

That is, 1 is the holder base. This holder base 1 has fixed contacts 2a and 2b on the lower side in FIG.
A connector 3 is further provided. As shown in FIG. 6, the fixed contacts 2a and 2b are directly connected to the terminal 4 on the upper side of the holder base 1 in FIG. In addition, the terminal 4 has a brush 5a,
It is directly connected to 5b and 5c.

Reference numerals 6a, 6b, and 6c are brush holders into which brushes 5a, 5b, and 5c and a compression spring (not shown) are fitted, so that the commutator 8 of the motor section 7 is pressed against the brush holders. ing. Here, the brushes 5a and 5b are used for high speed and low speed, respectively, and the brush 5c is used for constantly supplying power. Further, the reference numeral 9 indicates a ground breaker.

Furthermore, the reference numeral 10 is a gear case. This gear case 10 includes a worm wheel housing 1
0a and a holder base housing 10b.

The holder base housing 10b is provided with a hole 10c for fitting the connector 3 and a hole 10d for inserting the fixed contacts 2a, 2b,
The holder base 1 having the above structure is fitted into this holder base housing 10b and fixed with screws. Then, the worm shaft 7a of the motor section 7 is inserted into the opening 1a for inserting the commutator 8, and is pivotally connected to the pivot hole 10e.

On the other hand, the worm wheel housing 10a is
The deceleration shaft 11a of the worm wheel 11 is pivotally connected to the pivot hole 10f. And in this pivot state,
Together with the worm shaft 7a, it constitutes a speed reduction mechanism. Furthermore, movable contacts 12a and 12b are directly attached to the right side surface of the worm wheel 11 in FIG. 5, and as shown in FIG.
contacts the movable contacts 12a and 12b. In this case, the fixed contact 2b contacts the movable contact 12b, but does not contact the movable contact 12a. In this configuration, when the worm wheel 11 rotates,
The switch for the wiper auto-stop mechanism turns on and off.

Furthermore, the gear case cover 13 is engaged with the worm wheel housing 10a, and its side ends are fixed via screws.

(Problems to be Solved by the Invention) However, in such a conventional wiper drive device, if the fixed contacts 2a, 2b are shaped to obtain sufficient contact pressure to contact the movable contacts 12a, 12b by their own elastic force, When inserting the fixed contacts 2a and 2b into the holder base housing 10b, a complicated operation is required to avoid the worm wheel 11, and automatic assembly of this wiper drive device cannot be achieved, and manual assembly is required. The problem was that there was.

Therefore, the present invention has been devised by focusing on the above-mentioned conventional problems, and provides a wiper drive device that can automate the assembly work and can obtain sufficient contact pressure for the fixed contacts to contact the movable contacts. It is intended to.

[Structure of the invention] (Means for solving the problems) In order to achieve the above purpose, the structure of the invention is as follows.
To explain using FIGS. 1 to 4 corresponding to the embodiment, a worm wheel that engages with a worm shaft 29a of a motor section 29 to constitute a deceleration mechanism section 33 and has movable contacts 34a and 34b of a wiper auto-stop mechanism. 32, and brushes 26a, 26b, 26 that contact the commutator 30 of the motor section 29.
c and a fixed contact 23 that makes sliding contact with the movable contacts 34a and 34b of the wiper auto-stop mechanism.
a, 23b, and a holder base 21,
In a wiper drive device that stops a reciprocating wiper blade at a predetermined position, a gear case cover 35 that closes the deceleration mechanism section 33 is provided with a protrusion 36 made of an insulator, and the protrusion 36 controls the fixed contacts 23a, 23b. Press the movable contact 34
A, 34b are always in pressure contact with each other.

(Function) The protrusion of the insulator provided on the gear case cover can push down the fixed contact and bring it into contact with the movable contact with sufficient contact pressure. Furthermore, since the elastic force of the fixed contact itself does not provide the contact pressure to contact the movable contact, the fixed contact can be formed into a flat plate, which facilitates the assembly work of the wiper drive device and enables automatic assembly.

(Example) This invention will be explained below based on the drawings.

1 to 4 are diagrams showing an embodiment of this invention.

In the figure, 21 is a holder base. As shown in FIG. 1, fixed contacts 23a and 23b extending into the gear case 22 are attached to the holder base 21, and a connector 24 is also attached. Then, as shown in FIG. 4, the fixed contact 23
a, 23b are the terminals 25 of the holder base 21
It is directly connected to In addition, the terminal 25 has pigtails 2 on the brushes 26a, 26b, and 26c, respectively.
It is connected via 7.

Note that reference numerals 28a, 28b, and 28c are brush holders in which brushes 26a, 26 are placed.
b, 26c and a compression spring (not shown) are fitted therein, so that the commutator 30 of the motor section 29 is brought into pressure contact with the commutator 30 of the motor section 29. Here, the brushes 28a and 28b are used for high speed and low speed, respectively, and the brush 28c is used for constantly supplying power.

The gear case 22 is composed of a worm wheel housing 22a and a holder base housing 22b.

The holder base housing 22b is provided with a hole 22c for fitting the connector 24 and a hole 22d for inserting the fixed contacts 23a, 23b, and the holder base 21 having the above structure is fitted into the holder base housing 22b. and secure with screws. Then, the worm shaft 29a of the motor section 29 is inserted into the commutator 30 insertion opening 21a, and the pivot hole 22e of the holder base housing 22b is inserted.
It is pivoted to.

On the other hand, the worm wheel housing 22a is
The deceleration shaft 32a of the worm wheel 32 is pivotally connected to the metal bearings 31, 31 in the pivot hole 22f.
In this pivoted state, the worm shaft 29a
Together, they constitute a deceleration mechanism section 33. Furthermore, movable contacts 34a and 34b are directly attached to the surface of the worm wheel 32, as shown in FIG.

Reference numeral 35 is a gear case cover. This gear case cover 35 is provided with a protrusion 36 made of an insulator, and as shown in FIG. It works to push down.

Next, the fixed contact 23 of the wiper drive device configured as described above
The pressure contact effect in which a, 23b contacts the movable contacts 34a, 34b will be explained.

First, as shown in Fig. 3, the worm wheel 3
2 movable contacts 34a, 34b and holder base 21
It is assembled without contacting the fixed contacts 23a, 23b attached to the.

Next, gear case cover 3 provided with protrusion 36
5 is engaged with the worm wheel housing 22a, and its side ends are fixed via screws.

At this time, as shown in FIGS. 1 and 2, the protrusion 36 pushes down the fixed contacts 23a and 23b,
The pressed down fixed contacts 23a, 23b can contact the movable contacts 34a, 34b with sufficient contact pressure. In addition, the worm wheel 32 is designed to be lighter by increasing the area of engagement with the worm shaft 29a.
Even in this case, the fixed contacts 23a, 23b can be brought into contact with the movable contacts 34a, 34b with sufficient contact pressure without complicated manual assembly.

Note that since the protrusion 36 is an insulator, the current flowing through the fixed contacts 23a and 23b does not leak into the gear case cover 35.

[Effects of the invention] As explained above, according to this invention, the worm wheel engages with the worm shaft of the motor section to constitute the deceleration mechanism section and has a movable contact of the wiper auto-stop mechanism, and the commutator of the motor section. A wiper drive device for stopping a reciprocating wiper blade at a predetermined position, the wiper drive device comprising a brush in contact with the wiper blade and a holder base provided with a fixed contact in sliding contact with a movable contact of the wiper auto-stop mechanism, and stopping a reciprocating wiper blade at a predetermined position. It is necessary to provide a protrusion made of an insulator on the gear case cover that closes the mechanical part, and to press the fixed contact with the protrusion so that it is always in pressure contact with the movable contact, so that the fixed contact itself has a shape that provides elastic force. Therefore, it is possible to automate the assembly work and to obtain sufficient contact pressure for the fixed contact to contact the movable contact, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory view of essential parts showing an embodiment of the wiper drive device according to this invention, Fig. 2 is a side cross-sectional view showing the structure of the wiper drive device, and Fig. 3 is a gear case cover of the wiper drive device. 4 is a front explanatory view showing a removed state; FIG. 4 is a side view showing a state in which the motor section of the wiper drive device is removed; FIG.
FIG. 6 is an exploded perspective view showing the structure of a conventional wiper drive device, and FIG. 6 is a perspective view showing the structure of a holder base of the wiper drive device. 21... Holder base, 23a, 23b... Fixed contact, 26a, 26b, 26c... Brush, 2
9...Motor part, 29a...Worm shaft, 30...
... Commutator, 32 ... Worm wheel, 33 ...
Reduction mechanism section, 34a, 34b...movable contact, 35
...Gear case cover, 36...Protrusion.

Claims (1)

[Scope of utility model registration request] A worm wheel that meshes with a worm shaft of a motor section to constitute a deceleration mechanism section and has a movable contact of a wiper auto-stop mechanism, and a brush that contacts a commutator of the motor section and a movable contact of the wiper auto-stop mechanism that slides. A wiper drive device is provided with a holder base provided with fixed contacts that come in contact with each other and stops a reciprocally swinging wiper blade at a predetermined position. A wiper drive device characterized in that the fixed contact is pressed by a protrusion so as to be in constant pressure contact with the movable contact.