JP2595704Y2 - Ring thin plate fixing structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing an annular thin plate, for example, for fixing a relay plate of an automatic fixed position stop device to a worm wheel in a wiper for wiping a window glass mounted on a vehicle such as an automobile. 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 fixed position stop device for automatically stopping a wiper blade at a fixed position at a lower end of a window glass. This automatic in-position stopping device includes two sets of connecting devices configured so that the contacts of the contact plate slide relatively on the relay plate, and the two sets are connected to the rotation of the worm wheel driven by the wiper motor. The stop of the wiper motor is controlled by operating a switch between the contact and the relay plate in the two sets of connection devices.

[0003] As a connecting device used in such an automatic fixed position stopping device, for example, Japanese Utility Model Publication No. 59-157295.
As described in the publication, a relay plate as an annular thin plate formed in a circular ring shape was laid on the end face of a worm wheel molded from an insulating resin, and set on this relay plate. There is one in which a contact protruding from a contact plate is brought into sliding contact with the raceway surface.

In this connection device, to fix the relay plate to a resin worm wheel, a square hole for fixing the relay plate is formed at the time of molding the worm wheel. The fixing structure in which the locking claw is inserted and locked is adopted.

[0005]

However, in this relay plate fixing structure, since the fixing square holes are formed near the teeth of the worm wheel, the fixing holes are formed around the square holes when the worm wheel is molded with resin. When the resin shrinks, there is a problem that the accuracy of the tooth row (gear accuracy, runout, etc.) is reduced due to the influence of the shrinkage. In addition, when the position of the square hole of the worm wheel and the position of the locking claw of the relay plate are displaced, the relay plate may float.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an annular thin plate fixing structure which can properly fix an annular thin plate on a main surface of a fixed object without opening a fixing hole on the fixed object side. is there.

[0007]

Means for Solving the Problems] fixed annular structure sheet according to the present invention, in the fixing structure of the annular thin plate annular thin plate is fixed on the surface of the object to be fixed, steep engaging in the thin
At least one stop claw and a slightly inclined locking claw are separated from each other
And is bent obliquely in the direction away from the fixed object.
At least the steeply engaging locking claw and the gentle inclining member on the surface of the object to be fixed to which the annular thin plate is fixed.
At a position opposite to the claw and ribs are bulged form, before
In a state in which serial annular sheet is contact with the object to be fixed, the rapid
The tip of the inclined locking claws and the gently slant locking claw is characterized by being locked respectively engaged with the rib.

[0008]

According to the above-mentioned means, the annular thin plate is covered by pushing the steeply engaging locking claw into the outer peripheral surface of the opposing rib in a state where the slightly inclined locking claw is in contact with the outer peripheral surface of the rib. It can be fixed in a state of being centered on the main surface of the fixed object. In this case, since there is no need to form a fixing square hole in the object, it is possible to prevent the object from being affected by the fixing hole. Furthermore, since the annular thin plate is fixed to the object to be fixed in a state where each locking claw is engaged with the outer peripheral side wall surface of the rib, it is possible to prevent the annular thin plate from floating from the fixing surface of the object to be fixed.

[0009]

1A is a plan view showing a structure for fixing a relay plate according to an embodiment of the present invention, and FIG.
FIG. 3C is a cross-sectional view taken along line -b, (c) is an enlarged cross-sectional view of a part c shown in (b), and (d) is an enlarged cross-sectional view of a d part shown in (b). FIG. 2A is a plan view showing a relay plate, and FIG.
And (c) are sectional views showing the operation of assembling the relay plate.

In this embodiment, the structure for fixing the annular thin plate according to the present invention is applied to fix the relay plate to a worm wheel made of resin. The relay plate as an annular thin plate is configured as one element of the connection device, and cooperates with a contact plate (not shown) to configure an automatic wiper position stop device. This automatic fixed position stop device is mechanically incorporated into a wiper driving device (not shown) and electrically incorporated into an electric circuit (not shown) of the wiper motor.

The wiper automatic stop device has a worm wheel 11 as an object to which a relay plate is fixed. In the wiper automatic stop device, the worm wheel 11 is a worm (not shown). )
And driven by a wiper motor. The worm wheel 11 is integrally formed into a circular substantially flat disk shape using resin. On the outer periphery of the worm wheel 11, a tooth row 12 is formed so as to be able to mesh with the worm. A shaft mounting hole 13 is formed at the center of the worm wheel 11, and the worm wheel 11 is connected to an output shaft (not shown) by the shaft mounting hole 13.

In this embodiment, the worm wheel 11
A pair of ribs 14 and 15 formed in an arc shape are arranged concentrically with the worm wheel 11 and symmetrically with each other on one end surface (hereinafter, referred to as an upper surface) of the worm wheel 11 and bulge upward in a right angle direction. Out-molded. And both ribs 1
A pair of gaps 16 and 17 are interposed between both ends of 4 and 15, respectively.

The worm wheel 11, which is the object to be fixed,
Plate 2 as an annular thin plate fixed on the upper surface
No. 0 is made of a conductive and elastic plate material such as a copper-based material, and is integrally formed into a substantially donut-shaped flat plate by press working. A notch 21 is formed on the outer periphery of the relay plate 20 in an arc-shaped band shape having a constant radial width. A tongue piece 22 formed in a substantially trapezoidal shape is provided on the inner periphery of the relay plate 20 so as to project radially inward.

In this embodiment, on the inner periphery of the relay plate 20, there are two sets of a pair of locking claws, which are a pair of a steeply locking claw 23 and a gentlely inclined locking claw 24, and are mutually 90 degrees circumferentially. The tongue pieces 22 are arranged at intervals so as not to interfere with each other, and project inward in the radial direction and obliquely upward. That is, of the pair of locking claws, the steeply inclined locking claw 23 is formed so that the inclination angle of the flat surface of the relay plate 20 is greater than the inclination angle of the gentle inclination locking claw 24 of the relay plate 20. Have been. And steeply inclined locking claw 2
3 is set equal to the radial length of the slightly inclined locking claw 24. And a pair of locking claws 2
Two sets of locking claws 23, 24 and 23, 2, 3, 24 are opposed to each other across the center of the relay plate 20.
4 are arranged respectively. Therefore, the center of the circular shape virtually drawn by the four locking claws 23, 23 and 24, 24 is offset toward the two steeply locking locking claws 23, 23 with respect to the annular center of the relay plate 20. (Eccentric).

Next, the operation of assembling the relay plate 20 as an annular thin plate to the worm wheel 11 as an object to be fixed will be described. First, the relay plate 20 is disposed on the upper surface of the worm wheel 11 so as to face the end surface (lower surface) opposite to the side from which the locking claws 23 and 24 protrude, and is arranged substantially coaxially. Is inserted into one gap 16 between the ribs 14 and 15.

Subsequently, as shown in FIG. 2 (b), the relay plate 20 is inclined with respect to the upper surface of the worm wheel 11, and both the slightly inclined locking claws 24, 24 The relay plate 20 is inclined from the upper side of the worm wheel 11 around the outer periphery of the worm wheel 11, and the inclination of the relay plate 20 with respect to the worm wheel 11 is eliminated around the inclined lower end which is the end of the outer periphery of the relay plate 20 that is in contact with the upper surface of the worm wheel 11. Is turned in the direction in which

Then, as shown in FIG. 2C, when the inclination of the relay plate 20 is almost completely eliminated, the steeply inclined locking claws 23, 23 are placed on the outer peripheral side of the remaining rib 14. Touch the edge. Then, when the relay plate 20 is pushed down, as shown in FIG. 1, both steeply inclined locking claws 23, 23 are locked on the outer peripheral surface of the rib 14, and both gentlely inclined locking claw 23 are engaged. The claws 24, 24 are locked on the outer peripheral surface of the rib 15. In this state, since each locking claw bites into the outer peripheral wall of the rib to exhibit an anchoring effect, the relay plate 20 moves in a direction away from the upper surface of the worm wheel 11, that is,
Floating from the upper surface of the worm wheel 11 is reliably prevented. When the relay plate 20 is in contact with the upper surface of the worm wheel 11, the ribs 14 and 1 of the four locking claws 23, 23, 24, and 24 are provided.
5 is fixed by the locked state.

When each locking claw is projected from the inner periphery of the relay plate at the same inclination angle, each locking claw is inclined with respect to the upper surface of the worm wheel. When the claws are pushed into the ribs of the worm wheel, the bending angles of the locking claws may differ from each other.In the state after fixing, the center of the relay plate is eccentric to the center of the worm wheel. It happens frequently. Moreover,
Since the amount of eccentricity differs between products, the stability of quality and reliability decreases.

However, in the present embodiment, the alignment relationship between the relay plate 20 and the worm wheel 11 can be kept constant each time the assembling operation is performed. That is, after the gently inclined locking claw 24 comes into contact with the outer peripheral surface of the rib 15, the gently inclined locking claw 24 and the steeply inclined locking claw 23 are pushed into the respective ribs 14 and 15. Therefore, the relay plate 20 is assembled to the worm wheel 11 in a state where the relay plate 20 is positioned in advance by the gentle inclination locking claw 24. Therefore, the relay plate 10 is always assembled to the worm wheel 11 in a fixed state.

When a contact (not shown) of a contact plate is slid on the relay plate 20,
The relay plate 20 and the contact plate are electrically connected to each other. Relay plate 2
When the 0 notch 21 moves to the position of the contact plate, the relay plate 20 and the contact plate are brought into a non-contact state, and the relay plate 20 and the contact plate are electrically disconnected.

According to the embodiment described above, the following effects can be obtained. (1) Since the relay plate 20 can be fixed to the worm wheel 11 without forming a hole for fixing the relay plate in the worm wheel 11 formed integrally with the resin, the worm wheel 11 is integrally formed of the resin. At the time of molding, it is possible to avoid a phenomenon in which the accuracy of the outer peripheral tooth row 12 is reduced due to the influence of resin shrinkage near the relay plate fixing hole of the worm wheel.

(2) Each of the locking claws 23, 24 has a rib 14,
15, the relay plate 20 is in a state of exerting an anchoring effect by being bitten by the outer peripheral wall of the worm wheel 11, thereby reliably preventing the relay plate 20 from floating in a direction away from the upper surface of the worm wheel 11, that is, floating from the upper surface of the worm wheel 11. can do.

(3) After the gently inclined locking claw 24 comes into contact with the outer peripheral surface of the rib 15, the gently inclined locking claw 24 and the steeply inclined locking claw 23 are pushed into the respective ribs 14, 15. Since the relay plate 20 is assembled to the worm wheel 11 in a state where the relay plate 20 is positioned in advance by the gentle inclination locking claw 24, the centering relationship between the relay plate 20 and the worm wheel 11 is changed each time the assembling operation is performed. It can be kept constant.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

For example, the pair of locking claws 23 and 24 is not limited to two sets, but may be one set or three or more sets.
Further, in the present embodiment, the locking claws are provided on the inner peripheral side of the annular thin plate, but the positions of the locking claws may be on the outer peripheral side of the annular thin plate,
In this case, it is conceivable to reinforce the rib so that the anchoring action of the locking claw does not affect the tooth row, or to separately provide an anchoring rib for the locking claw.

In the above-described embodiment, the case where the relay plate is fixed to the worm wheel has been described. However, the present invention is not limited to this, and is applied to the entire structure of fixing the annular thin plate on the surface of the object to be fixed. can do.

[0027]

[Effects of the Invention] As described above, according to the present invention,
The annular thin plate can be properly fixed without opening a fixing hole in the object.

[Brief description of the drawings]

1A is a plan view showing a relay plate fixing structure according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line bb of FIG. 1A, and FIG. (D) is an enlarged cross-sectional view of a d part shown in (b).

FIG. 2A is a plan view showing a relay plate, and FIG.
And (c) are sectional views showing the operation of assembling the relay plate.

[Explanation of symbols]

11: worm wheel (fixed object), 12: tooth row, 1
3 ... shaft mounting hole, 14, 15 ... rib, 16, 17 ... gap,
20: relay plate (annular thin plate), 21: notch, 2
2 ... tongue piece, 23 ... steeply inclined locking claw, 24 ... gentle inclined locking claw.

Claims (1)

(57) [Scope of request for utility model registration] 1. An annular thin plate fixing structure in which an annular thin plate is fixed on a surface of an object to be fixed, wherein the thin plate has at least a steeply inclined locking claw and a gentlely inclined locking claw.
Are also separated from each other and separated from the fixed object
Projecting obliquely in the direction, and at least a surface on the side where the annular thin plate of the object to be fixed is fixed.
Also the position facing the steeply inclined locking claw and the gentlely inclined locking claw.
And ribs are bulged formed in a state where the annular sheet is contact with the object to be fixed, the
A fixed structure of an annular thin plate, wherein tips of a steeply inclined locking claw and a gentlely inclined locking claw are respectively locked to the ribs.