JP2002043009A - Electrical connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of continuity failure due to adhesion of foreign matters between a conducting plate and a sliding contact. SOLUTION: A C-shaped ring-shape first conducting part 21, a circular ring- shaped second conducting part 22, and a fan-shaped third conducting part 23 are laid concentrically on the top face of a worm wheel 11 of an automatic position stopping device of a wiper, and a first sliding contact 31a, a second sliding contact 32a and a third sliding contact 33a, the lower end surfaces of which are flat surface, are brought into sliding contact with the respective conducting parts 21, 22, 23. A C-shaped ring-like projection 25 and a non-conducting projection 26 constitute an elliptical projection to be projected on the first conducting part 21, and three circular-arc like projections 27a, 27b, 27c constitute an annular thrust article 27 to be projected on the second conducting part 22, and a circular-arc like projection 28 is projected on the third conducting part 23. A pair of semicircular projections 29 and 29 are projected in a region outside the third conducting part 23 of the top face of the worm wheel 11, whereby the probability that sliding contact catches foreign matter can be reduced, and the contact surface pressure becomes high, and the occurrence of continuity failure between the conducting plate and the sliding contact is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection device, and more particularly to an electric connection device in which electric connection is ensured by sliding a sliding contact relative to a conductive plate. Automatic position stop device (auto stop switch) for wipers that are installed in vehicles such as to wipe window glass
About what is effective to use.

[0002]

2. Description of the Related Art Generally, a wiper mounted on a vehicle such as an automobile is provided with an automatic stop device for automatically stopping a wiper blade at a fixed position at a lower end of a window glass.

[0003] This automatic wiper home position stop device comprises a wiper motor by an electrical connection device comprising a conductive plate laid on an insulating base and sliding contacts elastically slidably contacting the conductive plate and the insulating base. The stop of the wiper motor is controlled by a switch operation between the sliding contact and the conductive plate accompanying the rotation of the wiper motor. In other words, in the conventional automatic wiper fixed position stop device, a circular ring-shaped conductive plate and a C-ring-shaped conductive plate are concentrically laid on one end surface of a worm wheel of a motor having a worm gear reduction device that is a wiper motor. A pair of sliding contacts formed on a pair of contact plates connected to the positive and negative terminals of the wiper motor are configured to relatively slide on both conductive plates.

[0004] In this type of conventional automatic position stop device for a wiper, a sliding contact which relatively slides on a circular orbit formed by a worm wheel as an insulating base and a conductive plate is provided at the tip of a contact plate. The portion is curved into a substantially semi-cylindrical shape, and grease is applied on the worm wheel and the conductive plate in order to improve abrasion resistance.

[0005]

In the conventional automatic wiper stop device of the prior art, since grease is applied on the worm wheel and the conductive plate, foreign matter adheres to the worm wheel and the conductive plate. When a foreign substance such as an insulating foreign substance or a fibrous foreign substance adheres to the conductive plate, a substantially semi-cylindrical sliding contact formed by bending the tip of the contact plate and a conductive surface formed on a flat surface are formed. Foreign matter may be caught between the plate and the board, resulting in poor conduction. The following factors can be considered as causes of the conduction failure. First, since the sliding contact of the contact plate is formed in a substantially semi-cylindrical shape, the sliding contact tends to run on a foreign substance attached to the conductive plate. Second, if the contact plate is twisted, the sliding contacts are inclined, so that foreign matter is easily attracted.

Therefore, as a countermeasure, it is conceivable to further project a projection on the curved surface of the substantially semi-cylindrical sliding contact to reduce the probability of foreign matter being caught between the sliding contact and the conductive plate. . However, in a structure in which a projection is provided on the curved surface of the sliding contact, the contact of the sliding contact with the conductive plate becomes a point contact, which increases the surface pressure and promotes wear of the sliding contact and the conductive plate. And the wear resistance is reduced.

An object of the present invention is to provide an electrical connection device capable of preventing the occurrence of conduction failure due to the attachment of foreign matter between a conductive plate and a sliding contact while preventing a decrease in wear resistance. is there.

[0008]

According to the present invention, there is provided an electric connection device comprising: a conductive plate laid on an insulating base; and at least one sliding plate elastically slidingly contacting at least one of the conductive plate and the insulating base. An electrical connection device having a moving contact, wherein a ridge is projected from a track of the sliding contact of the conductive plate.

According to the above-described means, since the conductive plate is provided with the ridge in accordance with the trajectory of the sliding contact, even if a foreign substance adheres between the conductive plate and the sliding contact, the contact surface is formed. Therefore, the probability of picking up foreign matter due to an increase in surface pressure can be greatly reduced, and therefore, electrical connection can be maintained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In the present embodiment, the electrical connection device according to the present invention is configured as an automatic fixed-position stop device 10 for the wiper 1, as shown in FIG. The automatic fixed position stop device 10 for the wiper 1 is a wiper motor 2 mechanically constituted by a motor with a worm gear reduction device.
Is electrically incorporated in a drive electric circuit 3 of the wiper motor 2.

The worm wheel 11 of the motor with the worm gear reduction device, which is the wiper motor 2 in which the automatic in-position stop device 10 is mechanically incorporated, forms an insulating base of the electrical connection device. That is, FIGS. 2, 3, and 4
And the worm wheel 1 as shown in FIG.
Numeral 1 is formed in a disk shape using a resin having an insulating property, and a tooth row 12 meshing with a worm (not shown) is formed on a circumferential surface. A drive shaft 13 as an output shaft of the wiper motor 2 is connected to the center line of the worm wheel 11 so as to rotate integrally. Figure 1
As shown in FIG. 1, the drive shaft 13 is connected to the wiper shaft 7 for reciprocatingly rotating the wiper arm 8 via the link mechanism 9.

As shown in FIGS. 2, 3 and 6, one main surface (hereinafter referred to as an upper surface) of the worm wheel 11 is made of a conductive material such as copper or an alloy thereof, and is subjected to a punching press. A conductive plate 20 integrally formed into a substantially disk shape by processing is arranged concentrically, and a pair of claw portions 20a, 20a are press-fitted into a pair of fixing holes 11a, 11a of the worm wheel 11 and fixed. . The conductive plate body 20 includes a first conductive portion 21, a second conductive portion 22, and a third conductive portion 23. These conductive portions 21, 22, 2, and
Numerals 3 are concentrically arranged on the conductive plate 20 and are mechanically integrally connected.

As shown in detail in FIGS. 5 and 6,
The first conductive portion 21 is formed in a circular ring shape having a notch constituting the non-conductive portion 24, that is, a C-ring shape, and is disposed on the innermost side of the conductive plate 20. The second conductive part 22 is formed in a circular ring shape, and is arranged outside the first conductive part 21. The third conductive portion 23 is formed in a fan shape, and is arranged on a portion of the outer periphery of the second conductive portion 22 that faces the non-conductive portion 24 on the radial outside. The circumferential width of the third conductive portion 23 is set slightly smaller than the circumferential width of the non-conductive portion 24.

As shown in FIG. 2, the first conductive portion 21 and the second conductive portion 2 above the worm wheel 11 are provided.
A contact plate holder 30 is provided at a position facing the second and third conductive portions 23, and the contact plate holder 30 includes a first contact plate 31, a second contact plate 32, and a third contact plate 33. It is held so as to face the portion 21, the second conductive portion 22 and the third conductive portion 23. Each of the first contact plate 31, the second contact plate 32, and the third contact plate 33 is made of a plate material having conductivity and appropriate elasticity such as phosphor bronze, and is formed into a substantially rectangular shape by press working. FIG.
As shown in (c) and (d), a first sliding contact 31a and a second sliding contact 32a are provided at the tips (hereinafter referred to as lower ends) of these contact plates 31, 32, and 33.
The third sliding contact 33a is formed into a substantially angled steel shape by bending press working, and the sliding surface formed by the lower end surface of the substantially angled steel shape of the sliding contacts 31a, 32a, 33a is a flat surface. ing.

As shown by the hatched area in FIG. 3, a first sliding contact 31 is provided on the upper surface of the worm wheel 11.
a, the first trajectory K1, the second trajectory K2, and the third trajectory K3 which the second sliding contact 32a and the third sliding contact 33a draw relatively with the rotation of the worm wheel 11 are virtually circular ring shapes. And the first orbit K
1. The first sliding contact 31a, the second sliding contact 32a, and the third sliding contact 33a are provided on the second track K2 and the third track K3.
Are laid in such a way as to draw a plurality of ridges, an ellipse or an eccentric perfect circle. Each of the ridges has a semi-circular top surface, and the sliding contact surface is a flat surface with the first sliding contact 31a, the second sliding contact 32a, and the third sliding contact 33a by lines or points. It is configured to contact.

As shown in FIGS. 5 and 6, a ridge (hereinafter, referred to as a first conductive ridge) 25 having a substantially C-ring shape in plan view bulges upward in the first conductive portion 21. The first conductive ridge 25 is formed integrally with the first track K.
An elliptical shape is set within a range that fits in the area of No. 1. As shown in FIG. 2, FIG. 3, FIG. 4, and FIG.
Are formed integrally with each other at a portion corresponding to the shape of a circle (hereinafter, referred to as a non-conductive portion protrusion) 26 in a plan view.
The non-conductive portion ridges 26 cooperate with the first conductive ridges 25 by filling the cutouts of the first conductive ridges 25 at the portions of the non-conductive portions 24 of the first conductive portion 21, thereby forming a series of elliptical shapes. It constitutes a ridge. However, a break 25a is formed at the boundary between the first conductive ridge 25 and the non-conductive portion ridge 26.

As shown in FIGS. 5 and 6, each of the second conductive portions 22 is formed of three ridges 27a, 27b, and 27c each having an arc shape in a plan view.
It is called a second conductive ridge. ) 27 are integrally formed so as to bulge upward. Three arc-shaped ridges 27a, 27
The centers of b and 27c are shifted from the center of the perfect circle drawn by the second trajectory K2, but are set so that the arc falls within the area of the second trajectory K2. In addition, the three arc-shaped projecting ridges 27a, 27b, and 27c are radially displaced from each other, and are radially shifted from each other and overlap each other in the circumferential direction. Is in a state where a break 27d is formed. In this state, the second conductive ridges 27 substantially constitute a series of ridges within the area of the second track K2.

As shown in FIG. 4 and FIG. 5, a ridge (hereinafter, referred to as a third conductive ridge) 28 having a circular arc shape in plan view is bulged upward in the third conductive portion 23. It is integrally molded with. As shown in FIGS. 2, 3, 4, and 6, a portion of the upper surface of the worm wheel 11 excluding the third conductive portion 23 of the third track K <b> 3 has a substantially semicircular shape in plan view. Ridge (hereinafter referred to as insulation ridge) 2
9 and 29 are symmetrically arranged on the concentric circle and are integrally formed so as to project integrally.
9a and 29a are formed respectively. The third conductive ridge 28 fills one notch between the insulating ridges 29, 29 to cooperate with the insulating ridge 29 to form a series of elliptical ridges.

The first sliding contact 31a is pressed against the first conductive ridge 25 and the non-conductive portion ridge 26 by the elastic force of the first contact plate 31. The second sliding contact 32 a is formed by the elastic force of the second contact plate 32 on the second conductive ridge 2.
7 is pressed. The third sliding contact 33 a is pressed against the third conductive ridge 28 and the insulating ridges 29, 29 by the elastic force of the third contact plate 33.

As shown in FIG. 1, the first contact plate 31 is connected to the ground 5 of the drive electric circuit 3 of the wiper motor 2, and the second contact plate 32 is connected to the wiper switch 6. , The third conductive portion 23 is connected to the battery 4 and the wiper switch 6.

Next, the operation of the automatic fixed position stop device 10 according to the above configuration will be described.

In the wiper 1 shown in FIG. 1, when the wiper switch 6 is turned on, the wiper motor 2 is driven by the drive electric circuit 3, so that the worm wheel 11 rotates and the drive shaft 13 rotates. . With the rotation of the drive shaft 13, the wiper arm 8
Is reciprocated through the link mechanism 9 and the wiper shaft 7 to perform the wiping operation. On the other hand, with the rotation of the worm wheel 11, the first sliding contact 31a relatively slides on the first conductive ridge 25 and the non-conductive portion ridge 26, and the second sliding contact 32a moves on the second conductive ridge. Slide the strip 27, and make the third sliding contact 3
3a slides on the third conductive ridge 28 and the insulating ridge 29.

When the wiper switch 6 is turned off at random, while the first sliding contact 31a is in sliding contact with the first conductive ridge 25, the drive electric circuit 3 is kept energized. 11 and the drive shaft 13 continue to rotate. When the first sliding contact 31a comes into contact with the non-conductive portion ridge 26 as the wall wheel 11 continues to rotate, the first contact plate 31 and the first conductive portion 2
1 is cut off, so that the power supply to the wiper motor 2 is stopped.

At this time, the worm wheel 11 is advanced by inertia in a rotating system such as the wiper motor 2, the link mechanism 9, and the worm wheel 11, and the third sliding contact 33a
Are relatively slid to the third conductive ridges 28 and electrically connected to the third conductive portion 23, as shown in FIG. 1, a closed circuit of the wiper motor 2 is formed. When the wiper motor 2 functions as an electromagnetic brake device, the wiper motor 2 is brought into an abrupt stop state.

As described above, the correlation between the components is set such that the wiper arm 8 for wiping the wiper blade comes to a fixed position at the lower corner of the window when the wiper motor 2 is suddenly stopped. Even if the switch 6 is turned off at random, the wiper blade supported by the wiper arm 8 is always stopped at a fixed position.

According to the above embodiment, the following effects can be obtained.

1) First sliding contact 31a, second sliding contact 3
2a and the third sliding contact 33a slide on the first conductive ridge 25, the second conductive ridge 27 and the third conductive ridge 28, so that the probability that the sliding contact picks up foreign matter such as fibrous foreign matter is reduced. In addition to greatly reducing the contact surface pressure, it becomes difficult for the sliding contact to ride on the foreign matter due to the increased contact surface pressure. As a result, it is possible to prevent the occurrence of poor conduction.

2) By forming the ridge on which the sliding contact slides in an elliptical shape, the contact portion between the sliding contact and the elliptical ridge is swept (or swept) with the rotation of the worm wheel. Therefore, it is possible to prevent a reduction in the wear resistance of the sliding contact without causing a part of the sliding contact to be worn.

3) By providing a discontinuous part in the middle of the ridge, foreign matter can be dropped into the discontinuous part, and conduction failure due to the foreign matter can be prevented.

4) The annular second conductive ridge 27 is formed by three arc-shaped ridges 27a, 27b, 27c, and the center of the three ridges 27a, 27b, 27c is formed by the annular second conductive ridge. By displacing the ridge 27 from the center, the contact portion between the second sliding contact 32a and the second conductive ridge 27 can be swept (or swept) with the rotation of the worm wheel 11, so that the sliding contact Of the second sliding contact 32a can be prevented from being reduced without wear of a part of the second sliding contact 32a.

5) By forming the annular second conductive ridge 27 by three arc-shaped ridges 27a, 27b, 27c, it is possible to form a discontinuous portion 27d in the annular second conductive ridge 27. Therefore, even if a foreign substance such as a fibrous foreign substance adheres to the second conductive ridge 27, the foreign substance can be dropped into the discontinuous portion 27d, and a conduction failure due to the foreign substance can be prevented beforehand.

6) Three arc-shaped ridges 27a, 27
The electrical connection between the second conductive portion 22 and the second sliding contact 32a is maintained over the entire circumference by forming the annular second conductive ridge 27 by overlapping the start and end portions of the b and 27c. The second conductive portion 2
2, the common terminal function can be exhibited, and the automatic wiper position stop device 10 can be configured without any trouble.

7) First sliding contact 31a, second sliding contact 3
By forming the sliding contact surfaces of the second sliding contact 33a and the third sliding contact 33a as flat surfaces, the first conductive ridge 25, the second conductive ridge 27
And the third conductive ridge 28 can be brought into contact with a line or a point, so that it is possible to further reduce the climbing of a foreign substance such as a fibrous foreign substance, and drop the foreign substance into a discontinuous portion of each ridge after dragging the foreign substance. be able to.

It should be noted that the present invention is not limited to the above-described embodiment, but may be modified without departing from the scope of the invention.
It goes without saying that various changes can be made.

For example, the first conductive portion, the second conductive portion, the third conductive portion, and the non-conductive portion are not limited to being formed integrally with the conductive plate, but may be formed independently of each other.

In the above embodiment, the first conductive portion,
Although the second conductive portion, the third conductive portion and the non-conductive portion have been described in the case of an automatic fixed position stop device of the wiper laid on the worm wheel which is an insulating base, the present invention, the first conductive portion, the second conductive portion The third conductive portion and the non-conductive portion are laid on an insulating base separate from the worm wheel, so that the first contact plate, the second contact plate, and the third contact plate are rotated by a clutch member linked to the worm wheel. The present invention can also be applied to a configured automatic wiper position stop device.

In the automatic wiper position stop device, the third conductive portion and the third contact plate for exerting the electromagnetic brake function at the automatically stopped position are mechanisms set as required. Therefore, it may be omitted.

Further, the present invention is not limited to the automatic wiper position stop device, but can be applied to other electrical connection devices such as other automatic stop switch devices and slip ring devices. In that case, the conductive plate and the sliding contact are not limited to being provided in plurals, and may be a single or a combination of single and plural. Further, the conductive plate is not limited to being provided on the end surface (the surface intersecting the center of rotation) of the insulating base, and may be provided on the circumferential surface of the cylindrical or cylindrical insulating base.

[0040]

As described above, according to the present invention,
It is possible to prevent the occurrence of conduction failure due to the attachment of foreign matter between the conductive plate and the sliding contact, while preventing a decrease in wear resistance.

[Brief description of the drawings]

FIG. 1 is a schematic view of a device for automatically stopping a wiper in a fixed position according to an embodiment of the present invention.

FIG. 2 shows an automatic wiper position stop device;
(A) is a partially cut front view, (b) is a partially cut side view,
(C) is an enlarged view of part c of (b), and (d) is c- of (c).
It is sectional drawing which follows the c line.

FIG. 3 is a plan view without the contact plate holder.

4A and 4B show a worm wheel, wherein FIG. 4A is a front view, FIG. 4B is a cross-sectional view taken along line bb of FIG. 4A, and FIG. 4C is a cross-section taken along line cc of FIG. FIG.

FIG. 5 shows a conductive plate body, (a) is a plan view,
(B) is a sectional view taken along line bb of (a), and (c) is a sectional view taken along line cc of (a).

FIG. 6 is an exploded perspective view showing an assembly of a worm wheel and a conductive plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wiper, 2 ... Wiper motor (motor with worm gear reduction device), 3 ... Wiper motor drive electric circuit, 4 ...
Battery 5, ground, 6 wiper switch, 7 wiper shaft, 8 wiper arm, 9 link mechanism, 1
0: Automatic wiper position stop device (electrical connection device)
Reference Signs List 11 worm wheel (insulating base), 11a fixing hole, 12 tooth row, 13 drive shaft (output shaft of wiper motor), 14 wiper shaft, 20 conductive plate body, 20a claw part, 21 first Conductive part (conductive plate), 22
... second conductive part (conductive plate), 23 ... third conductive part (conductive plate), 24 ... non-conductive part, 25 ... first conductive ridge, 25a ...
Interrupted portion, 26 ... non-conductive portion ridge, 27 ... second conductive ridge,
27a, 27b, 27c: arc-shaped ridge, 27d: interrupted portion, 28: third conductive ridge, 28a: interrupted portion, 29
... insulating ridges, 29a ... breaks, 30 ... contact plate holder, 31 ... first contact plate, 31a ...
First sliding contact 32, second contact plate 32a
... Second sliding contact, 33 ... Third contact plate, 33
a: third sliding contact, K1: first track, K2: second track,
K3: Third orbit.

Claims (7)

[Claims] 1. An electrical connection device comprising: a conductive plate laid on an insulating base; and at least one sliding contact elastically slidingly contacting at least one of the conductive plate and the insulating base. An electrical connection device, wherein a ridge is projected from a track of the sliding contact of the conductive plate. 2. The electrical device according to claim 1, wherein the ridge is configured to slide on the sliding contact in substantially the entire area in the width direction of the sliding contact within the track of the sliding contact. Connection device. 3. The electrical connection device according to claim 1, wherein the ridge has a break in at least one position on the track of the sliding contact. 4. The sliding contact slides on the conductive plate and the insulating base, and a ridge is provided on a track of the sliding contact of the insulating base. 1,
4. The electrical connection device according to 2 or 3. 5. The sliding contact according to claim 1, 2, 3 or 4, wherein a contact portion of the sliding contact with the ridge is configured to contact the ridge at least with a line. Electrical connection device. 6. At least one pair of said sliding contacts is provided, and one sliding contact always slides on said conductive plate,
The other sliding contact is configured to slide on a conductive plate that constitutes a switch.
6. The electrical connection device according to 2, 3, 4, or 5. 7. The worm wheel of a motor with a worm gear reduction device, wherein the insulating base is configured so that the sliding contact and the conductive plate are relatively slid by the worm wheel. The electrical connection device according to claim 6, wherein