JPH0139092Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention]

(Industrial Application Field) This invention relates to improvement of a wiper drive device mounted on a vehicle such as an automobile. (Prior Art) FIGS. 1 to 5 are explanatory diagrams showing a conventional wiper drive device of this type. That is, the wiper drive device includes a gear case 1 connected to a motor 10, as shown in FIGS. 1 to 4. The gear case 1 includes a worm wheel housing 1a that accommodates a worm wheel 2, and brushes 12a, 12b, 12c.
A base housing 1 that accommodates a base 9 provided with
It has b. A worm wheel pivot hole 1c is formed in the worm wheel housing 1a, and a deceleration shaft 2a provided on the left side surface of the worm wheel 2 in FIG. 1 is pivoted to the worm wheel pivot hole 1c. Then, the gear cover 5 is engaged with the right side surface of the worm wheel housing 1a in FIG. 1 in the same way as a lid, and fixed with screws. The worm wheel 2 has a plate 4 pivotally mounted on its surface facing the gear cover 5, on which rotary contact pieces 3a and 3b for an auto-stop switch are attached to form a short circuit and stop the wiper blade at a predetermined position. Further, on the surface of the gear cover 5 on the worm wheel 2 side, a fixed contact piece 6 that slides on the rotating contact pieces 3a and 3b is provided.
a and 6b are provided. The plate 4 is provided with a protrusion 4a that engages with a protrusion 2b provided on the worm wheel 2.
As a result, when the worm wheel 2 rotates, the plate 4 rotates, and the auto-stop switch, which will be described later, is opened and closed by the rotating contact pieces 3a, 3b and fixed contact pieces 6a, 6b, which constitute the auto-stop switch. The fixed contact pieces 6a and 6b are directly connected to terminals 8a and 8b, respectively, of a power supply connector 7 provided on the outer surface of the gear cover 5 shown in FIG. On the other hand, the base 9 is fitted into the base housing 1b and fixed with screws. This base 9
In order to contact the commutator 11 fixed to the armature shaft 10a of the motor 10, three brushes 12a, 12 are installed.
b, 12c are provided. Here, the two brushes 12a and 12b are used for high speed and low speed, respectively. Also, the remaining brush 12
c is used to always supply power to the commutator 11. Thus, as shown in FIG. 5, the wiring 13a, which corresponds to the HIGH, LOW and OFF positions 30a, 30b, 30c of the external power selector switch 30, is connected from the terminals 8d, 8c, 8b of the connector 7.
13b, 13c and separate the individual brushes 12.
Connect to a, 12b, 12c. At this time, each of the wirings 13a, 13b, and 13c is passed through an insulating member 1e fitted into a notch formed in the base housing 1b (see FIG. 2). Furthermore, terminal 8e
The rotary contact piece 3 is attached to the motor 10 whose body is grounded.
This is a terminal for contacting a. The base housing 1b and the base 9 are each formed with an armature shaft pivot hole 1d and an opening 9b. Then, the worm 10b formed on the armature shaft 10a of the motor 10 is first inserted into the opening 9.
b, and then pivotally connected to the armature shaft pivot hole 1d. In this pivoted state, the worm 10b meshes with the worm wheel 2 and the deceleration mechanism section 14
(See Figure 2). The wiper drive device constructed in this way is attached to the inner wall 17 of an automobile via the mounting leg 15, screw 16, bracket 16a, etc. of the gear case 1, as shown in FIG. 4, for example. Next, the operation of the wiper drive device will be explained based on the control circuit shown in FIG. 5. First, in FIG. 5a, the external power selector switch 30 is turned on.
A high-speed circuit is shown when set to HIGH position 30a. In this case, electric power is supplied to the commutator 11 via the high-speed brush 12a and the constantly energized brush 12c, and the armature shaft 10a rotates at high speed. The worm 10 is attached together with the armature shaft 10a.
b also rotates at high speed and transmits its torque to the worm wheel 2 via the reduction mechanism section 14. Next, the torque of the worm wheel 2 is transmitted to the wiper arm 19 fixed to the tip of the deceleration shaft 2a of the worm wheel 2 via a bolt 18, and via a spherical shaft 20 (not shown in FIG. 4) provided on the wiper arm 19. Swings the wiper blade back and forth at high speed. In addition, in FIG. 5b, the changeover switch 30 is set to LOW.
A low-speed circuit is shown in position 30b. In this case, the circuit operates in the same way as the high-speed circuit when it is in the HIGH position 30a. However, in this case, as a result of power being supplied to the commutator 11 via the low-speed brush 12b and the constantly energized brush 12c, the wiper blade swings back and forth at a low speed to wipe the windshield. Next, switch the changeover switch 30 shown in FIG. 5c and d.
The auto-stop switch circuit when set to OFF position 30c will be explained. The circuit in FIG. 5c shows the circuit immediately after the changeover switch 30 is switched to the OFF position 30c. In this case, the fixed contact piece 6a and the rotating contact piece 3a are in contact with each other. Therefore, electric power is passed through the low-speed brush 12b and the constantly energized brush 12c to the commutator 1.
1, the wiper blade does not stop immediately and continues to swing back and forth at low speed. Then, when the wiper blade moves to a predetermined position, the fixed contact piece 6a shifts to one rotating contact piece 3a.
5d, both fixed contact pieces 6a, 6b come into contact with the other rotating contact piece 3b. At this time, the autostop circuit 31 constitutes a short circuit. Therefore, the armature shaft 10a automatically stops, and at this point the reciprocating swing of the wiper blade also stops. Therefore, the wiper drive device can always stop the wiper blade at a predetermined position when the changeover switch 30 is turned off. In addition, the code 33 in the figure is an external power supply, and 35
indicates a field magnet. (Problem to be solved by the invention) However, in the conventional wiper drive device having such a structure, each of the brushes 12a to 12c
, the connector 7 and the auto-stop switch are located at separate locations, and the distance between them is large;
In addition, since the connector 7 is provided on the outer surface of the gear cover 5, the wires 13a, 13b, 13c drawn out longer than the connector 7 are connected to the brush 12, respectively.
A, 12b, and 12c need to be wired, which makes installation quite troublesome and increases costs, and it has been an issue to solve these problems. (Purpose of the invention) This invention was made to solve these conventional problems, and it is a wiper that has a simple structure and can be easily integrated and reduce costs. The purpose is to provide a driving device.

[Structure of the invention]

(Means for Solving the Problems) The wiper drive device of this invention houses a worm and a worm wheel for converting the rotational motion of the motor into the swinging motion of the wiper blade in a gear case connected to the motor, and a base with brushes that contact the commutator of the switch, an autostop switch that forms a short circuit to stop the wiper blades in place, and a single connector for powering the brushes and the autostop switch. A wiper drive device comprising: a plurality of fixed contact pieces provided on the base; a cam that rotates together with the worm wheel; a cam bar that swings as the cam rotates; and a wiper drive device that swings as the cam bar swings. and a movable contact piece that switches energization between the fixed contact pieces to form an auto-stop switch.Furthermore, a connector is integrally provided on the base, and the connector is exposed to the outside through a hole formed in the gear case. By adopting this configuration, the above configuration is used as a means for solving the conventional problems. (Example) Hereinafter, an example of this invention will be described with reference to the drawings of FIGS. 6 to 11. In FIG. 6, reference numeral 39 indicates the brushes 12a, 12b,
12c, the base 39
As shown in FIG. 8, a single connector 37 is integrally provided on the surface of the gear case 1 side.
Also, as shown in FIG. 6, the motor 1 of the base 39
An auto-stop switch 21 is provided on the zero side surface to form a short circuit and stop the wiper blade at a predetermined position. As shown in FIGS. 9 and 10, this auto-stop switch 21 includes first and second fixed contact pieces 25a spaced apart,
25b, and the first and second fixed contact pieces 25a, 2
5b and a third fixed contact piece 25c facing both sides.
, each fixed contact piece 2 is interposed between these and made slidable in the arrangement direction of the first and second fixed contact pieces 25a and 25b (vertical direction in FIG. 10).
A movable contact piece 23 that switches energization between 5a, 25b, and 25c, a cam 28 that rotates together with the worm wheel 2, and a cam rod 2 that swings due to the rotation of the cam 28 and drives the movable contact piece 23 back and forth.
In addition, a sliding insulating member 24 to which the movable contact piece 23 is attached and a fixed contact piece 25
Fixed insulating member 26 with a, 25b, 25c attached
It is composed of: Of the five terminals 8a to 8e in the connector 37, two terminals 8d and 8
c, high-speed brush 12a, and low-speed brush 12
b by pigtails 40, and directly connect the three terminals 8e, 8b, 8a to the fixed contact pieces 25a, 25b, 25c,
Further, the second fixed contact piece 25b and the brush 12c for constant energization are connected by another pigtail 40. Here, the base housing 1b has a hole 1 in which the connector 37 is fitted and exposed to the outside.
f and a hole 1g into which the cam rod 22 is inserted. Then, the base 39 having the above structure is fitted into the base housing 1b and fixed with screws. At this time, the waterproof packing member 27 is fitted to the connector 37 to prevent water from entering through the gap between the base housing 1b and the connector 37. The cam rod 22 swings back and forth about a cam rod fixing member 22b provided on the base 39 as a fulcrum. This cam rod 22 has one end connected to a movable contact piece 2.
It is connected to the sliding insulating member 24 of No. 3. As the cam rod 22 reciprocates, it reciprocates the sliding insulating member 24 and the movable contact piece 23 as shown in FIGS. 11c and d, thereby opening and closing the auto-stop switch 21. . Therefore, as shown in FIG. 6, the worm 10b of the motor 10 is first inserted into the opening 39b for inserting the commutator 11, and then pivoted into the armature shaft mounting hole 1d, as in the conventional case. On the other hand, in the worm wheel housing 1a, the deceleration shaft 2a of the worm wheel 2 is pivotally connected to the worm wheel pivot hole 1c. In this pivoted state, the worm wheel 2 and the worm 10b
mesh with each other to form the deceleration mechanism section 14 (seventh
figure). In this case, the aforementioned cam 28 is attached to the deceleration shaft 2a.
It is centrally connected. The cam 28 and the worm wheel 2 have protrusions 2 on opposing surfaces that engage with each other.
8a and 2b are provided. This allows the cam 28 to rotate together with the rotation of the worm wheel 2, and provides play when the worm wheel 2 is reversed to operate a storage mechanism (not shown). Also, at this time, the cam 28 has a torsion spring 22 attached to the other end of the cam rod 22.
It is pressed by the urging force of a (see Figure 9),
The rotation of the cam 28 causes the cam rod 22 to swing back and forth. In FIG. 6, the gear cover 35 is engaged with the worm wheel housing 1a and fixed at its side end via screws. In this case, the gear cover 35 includes the conventional connector 7 and fixed contact pieces 6a, 6b.
(See Figure 1) etc. are excluded. The wiper drive device as an embodiment of this invention thus constructed may be installed on the vehicle body wall 17 in the same manner as in the conventional case.
(Fig. 4). Next, the operation of the wiper drive device of the present invention will be explained in the 11th section.
The explanation will be based on the control circuit shown in the figure. First, in Fig. 11a, the external power selector switch 30 is turned on.
A high-speed circuit is shown when set to HIGH position 30a. In this case, as a result of power being supplied to the commutator 11 from the high-speed brush 12a and the constantly energized brush 12c via the terminal 8d and the second fixed contact piece 25b (terminal 8b), the wiper blade (not shown) operates at high speed. Swings back and forth. During this time, the movable contact piece 23 continues to reciprocate due to the action of the cam 28 and the cam rod 22, but since the third fixed contact piece 25c is open in the circuit, the auto-stop switch 21 cannot be operated. do not have. Also, set the changeover switch 30 in Fig. 11b to LOW.
When the switch is set to the HIGH position, the same effect as when the switch is set to the HIGH position is performed. However, in this case, via the terminal 8c and the second fixed contact piece 25b,
Low-speed brush 12b and constantly energized brush 1
As a result of energization through 2c, the wiper blade swings back and forth at low speed. Next, the auto-stop switch circuit shown in FIGS. 11c and 11d will be explained. The circuit in FIG. 11c shows the circuit immediately after switching to the OFF position 30c. In this case, the movable contact piece 23
1. Contacting the third fixed contact pieces 25a and 25c. Therefore, immediately after switching to the OFF position 30c, the first fixed contact piece 25a, the movable contact piece 23,
The path of the third fixed contact piece 25c, the changeover switch 30 and the terminal 8c, and the second fixed contact piece 25b
Electric power is supplied to the low-speed brush 12b through the
and the commutator 11 from the brush 12c for constant energization.
As a result, the wiper blade does not stop immediately and continues to swing back and forth. Then, when the wiper blade returns to the predetermined position, the cam 28 presses the cam rod 22, and the movable contact piece 23 is moved between and brought into contact with the second and third fixed contact pieces 25b and 25c. At this time, Fig. 11d
As shown, the second fixed contact piece 25b, the movable contact piece 23, the third fixed contact piece 25c, the changeover switch 3
0 and terminal 8c form a short circuit. Therefore, the armature shaft 10a automatically stops, and at this point, the reciprocating swing of the wiper blade also stops.

[Effect of the idea]

As explained above, the wiper drive device of this invention accommodates a worm and a worm wheel for converting the rotational motion of the motor into the swinging motion of the wiper blade in a gear case connected to the motor, and a commutator of the motor. a base with a brush in contact with the wiper blade, an autostop switch for forming a short circuit to stop the wiper blade in place, and a single connector for supplying power to the brush and the autostop switch. In the wiper drive device, a plurality of fixed contact pieces provided on the base, a cam that rotates together with the worm wheel, a cam bar that swings as the cam rotates, and a cam bar that swings as the cam bar swings, and a cam that rotates together with the worm wheel; An auto-stop switch is configured with a movable contact piece that switches energization between the contact pieces, and a connector is integrally provided on the base, and the connector is exposed to the outside through a hole formed in the gear case. As a result, the distance between each brush, connector, and auto-stop switch can be significantly shortened, making it possible to shorten the wiring from the connector to the brush, and by integrating the base and connector. It has excellent advantages such as being able to reduce the number of parts, being compact, having extremely high assembly efficiency, and being inexpensive.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of a conventional wiper drive device.
FIG. 2 is a front view of the same, FIG. 3 is a view taken along the - line in FIG. FIG. 6 is an exploded perspective view of a wiper drive device as an embodiment of the invention, FIG. 7 is a front view thereof, and FIG.
9 is an explanatory view showing the structure of a connector and auto-stop switch according to an embodiment of this invention, FIG. 10 is a top view of a brush holder base according to this invention, and FIG. 11 is an illustration of this invention. FIG. 2 is a control circuit diagram showing the operation of a wiper drive device as an example of the present invention. 1... Gear case, 1f... Hole, 2... Worm wheel, 10... Motor, 10b... Worm, 11... Commutator, 12a, 12b, 12c...
...Brush, 21...Auto stop switch, 2
2...Cam rod, 23...Movable contact piece, 25a, 2
5b, 25c... fixed contact piece, 28... cam, 3
7... Connector, 39... Base.

Claims (1)

[Scope of utility model registration request] A worm and a worm wheel that convert rotational motion of the motor into swinging motion of a wiper blade are housed in a gear case connected to the motor, and a short circuit is formed with a base provided with a brush that contacts a commutator of the motor. an auto-stop switch that stops the wiper blade in a predetermined position;
A wiper drive device comprising the brush and a single connector for supplying power to the auto-stop switch, wherein the wiper drive device includes a plurality of fixed contact pieces 25a, 25b, 25c provided on the base 39 and rotates together with the worm wheel 2. cam 28
and a cam rod 2 that swings due to the rotation of the cam 28.
2, and a movable contact piece 23 that switches the energization between the fixed contact pieces 25a, 25b, and 25c as the cam rod 22 swings.
1 and a connector 3 on the base 39.
7 integrally projecting, and the connector 37
A wiper drive device characterized in that the wiper drive device is exposed to the outside through a hole 1f formed in a gear case 1.