JP2576567Y2 - Wiper drive unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive unit having a built-in motor and a reduction gear mechanism for driving a wiper arm of a wiper device such as a wind wiper, a mirror wiper, and a lamp wiper for an automobile. The present invention relates to a drive unit having a built-in control mechanism.

[0002]

2. Description of the Related Art FIG. 4 is an overall exploded perspective view of a mirror wiper for an automobile shown as an example of a wiper device. A mirror 22 is fitted into the front opening of the mirror housing 21, and is pressed down and fixed by a rim 23. The rim is provided with a bearing hole 24 substantially orthogonal to the mirror surface, and rotatably supports a wiper drive shaft 25. The wiper arm 27 of the wiper assembly 26 is fitted to the end of the wiper drive shaft 25 and fixed with a nut 28. A wiper cover 29 covers the nut 28. A driven lever 30 is fixed to the wiper drive shaft 25. On the other hand, the mirror housing 2
A drive unit 31 is provided in the device 1. The drive unit 31 contains a drive motor and a reduction gear (both not shown), and the output shaft 7 is rotated. A crank arm 32 is fixed to the output shaft 7, and a crank pin of the crank arm and the driven lever 30 are connected by a connecting rod 33. As a result, when the output shaft 7 makes one rotation, the wiper drive shaft 25 rotates one reciprocation, and the wiper arm 27 attached to the wiper drive shaft 25 performs the reciprocating wiping operation. When the output shaft 7 rotates continuously, the wiper drive shaft 25 is continuously reciprocated, and the wiper assembly 26 fixed via the wiper arm 27 continuously reciprocates to perform the wiping function. However, for example, in the case of light rain, it is not necessary to continuously perform the wiping operation, and it is preferable to perform intermittent operation in which the reciprocating operation is repeated several times and then stopped, and the reciprocating operation is performed several times after a while. FIG. 5 is a front view schematically showing a conventional example of an automobile wiper device provided with a control mechanism configured to intermittently rotate an output shaft, with a housing lid removed. It is. FIG. 6 shows an automobile wiper device provided with the control mechanism of the above-mentioned conventional example.
FIG. 3 is a cross-sectional view drawn by cutting along a plane. (See FIG. 5) A driving motor 2 is installed in a housing 1, and a worm 3 is fixed to a rotating shaft thereof. The first-stage reduction source gear 5, which is coaxially and integrally connected to the worm wheel 4 that is rotated by meshing with the worm 3,
It meshes with the first stage reduction receiving gear 6 and rotates it. An output shaft 7 is fixed to the first-stage reduction receiving gear 6,
It is rotated together with the first-stage reduction gear 6. The output shaft 7 is the same as the output shaft 7 described with reference to FIG. 5, and performs the wiping operation with the wiper assembly. A second-stage reduction base gear 8 is fixed to the output shaft 7 and meshes with a second-stage reduction receiving gear 9. Thereby, the second-stage reduction gear 9
Are rotated at a rotation speed that is one third of the output shaft 7.
(See FIG. 6) A print circuit 10, which will be described in detail later with reference to FIG. 7, is attached to the second-stage reduction receiving gear 9. On the other hand, a printed circuit board 11 is installed in the housing 1, and a plurality of contact points 15 mounted on the printed circuit board 11 are overlapped in the drawing.
FIG. 7 is described in detail).
Conducted. FIG. 7 is a wiring diagram of electric components constituting the conventional wiper control mechanism shown in FIGS. 5 and 6. Print circuit 10 shown in FIG.
Is the print circuit 10 described above with reference to FIG. 6, and together with the second-stage reduction receiving gear 9, ９ of the output shaft 7
It rotates at the rotation speed of. The printed circuit 10 has a substantially ring-shaped pattern, and has a notch 10a formed on the outer circumference thereof and a projection 10b formed on the inner circumference thereof. A contact point 15A is provided so as to face the notch 10a, and a contact point 15C is provided so as to face the projection 10b. Also, a contact point 15B is provided so as not to oppose.

[0003] Reference numeral 14 denotes a push switch,
When not being pushed, the COM contact and the NC contact are electrically connected, and when being pushed, the COM contact and the NO contact are electrically connected. The COM contact is a drive motor 2
Connected to the negative terminal of The plus terminal of the driving motor 2 is connected to a DC power source B through a thermistor 13.
It is connected to the plus terminal of T. The NO contact is grounded and connected to the contact point 15A. The contact point 15B is connected to the NC contact of the push switch 14, and the contact point 15C is connected to the plus terminal of the driving motor 2.

Considering the state where the push switch 14 in FIG. 7 is not pressed, the plus terminal of the motor 2 is electrically connected to the plus terminal of the DC power supply BT, but the minus terminal of the motor 2 is not grounded. , A closed circuit including the motor 2 and the DC power supply BT is not formed, and the motor 2 does not rotate. Then, when the push switch 14 is pressed and the COM contact and the NO contact become conductive,
The minus terminal of the motor 2 is grounded via the NO contact, and the motor 2 starts rotating. Accordingly, the print circuit 10 starts to rotate. Print circuit 1
When the pushing of the push switch 14 is released after slightly turning 0, the push switch is restored to the normal state, but the minus terminal of the motor 2 is connected to the COM contact of the push switch.
Since the contact C is grounded via the contact C → contact point 15B → print circuit 10 → contact point 15A, the motor 2 continues to rotate. When the output shaft shown in FIGS. 4 to 6 rotates three times, the wiper assembly 26 (FIG. 4) repeats the wiping operation three times.
0 (FIGS. 6 and 7) makes one rotation and returns to the state depicted in FIG. Then, the contact point 15A reaches the notch 10a of the print circuit 10, the power supply to the motor 2 is cut off, and the generation of the rotational force of the motor 2 disappears. Almost at the same time, contact point 15C is printed circuit 1
Since the two terminals of the motor 2 are short-circuited by contact with the protrusion 10b of the motor 2, the motor 2 is subjected to electric braking and suddenly stops.
As described above, the wiper device provided with the above-described conventional control mechanism has a function that, when the push switch 14 is temporarily pressed, the wiper assembly 26 performs the wiping operation three times and then automatically stops. Fulfill.

[0005]

In the above-mentioned prior art, when the push switch 14 shown in FIG. 7 is temporarily pushed and released, the wiper assembly 26 shown in FIG. 4 performs three reciprocating wiping operations. Stop automatically. However, it is extremely inconvenient for the wiper assembly 26 to stop near the center of the mirror 22 and must stop close to the peripheral edge of the mirror 22. In theory, such an adjustment should be possible by regulating the relationship between the rotation angle position of the print circuit 10 and the rotation angle position of the output shaft 7 shown in FIG. 6, but as can be understood from FIG. When assembling the second-stage reduction receiving gear 9, the printed circuit 10 is hidden behind it and cannot be seen. Therefore, an adjustment mechanism as shown in FIG. 8 is provided. The drive unit 31 shown in FIG. 8 is the drive unit 31 described in FIG. 4, and the output shaft 7 shown in FIG. 8 is the output shaft 7 described in FIG. The crank arm 32 shown in FIG. 8 is the crank arm 32 described in FIG. 4, but is drawn in an enlarged manner for the convenience of reading. The crank arm 32 is fixed to the output shaft 7 by tightening the push screw 35, and the push switch 14 shown in FIG. 7 is temporarily pressed to perform the wiper operation. Since the wiper assembly (reference numeral 26 shown in FIG. 4) automatically stops after a predetermined number of reciprocating wiping operations, the push screw 35 in FIG. 8 is loosened to connect the crank arm 32 to the output shaft 7. Unravel and move the wiper assembly with your fingertips to move the mirror 2
After approaching to the edge of No. 2, the above set screw 35 is retightened. As described above, the wiper drive unit of the conventional example requires a large amount of time and labor for assembly and adjustment because it has to be assembled and then adjusted again. In addition, as shown in FIG. 8, since the cylindrical surface of the output shaft 7 is pressed by the push screw 35 as shown in FIG. 8, the connection between the crank arm 32 and the output shaft 7 is uncertain, and the push screw 35 is loosened. Thus, there is a possibility that the output shaft 7 may idle. The present invention has been made in view of the above circumstances, and there is no need to disassemble the components and re-adjust them once assembled, and there is a possibility that the adjustment mechanism will loosen during use and the wiper operation will stop. It is an object of the present invention to provide a wiper drive unit free from such a problem.

[0006]

SUMMARY OF THE INVENTION The wiper drive unit according to the present invention created to achieve the above object (no need for re-adjustment) has an output which is rotationally driven by a drive motor via a reduction gear mechanism. A drive unit for a wiper having a shaft, wherein (a) a base gear fixed to the output shaft and not belonging to the reduction gear mechanism, and (b) meshed with the base gear and rotated. (C) a switching mechanism member that is fixed to the receiving gear and rotates integrally with the receiving gear to open and close a power supply circuit of the drive motor. Each of the receiving gear and the rotary member fixed to the output shaft is provided with a corresponding alignment mark.

[0007]

According to the above construction, the angular positional relationship between the receiving gear, to which the switching mechanism member is fixed and driven to rotate, and the output shaft to which the original gear for driving the receiving gear is fixed, is easily adjusted by the alignment mark. Since it is possible to assemble the drive unit once, it is not necessary to readjust it after assembling, and if the assembling is performed together with the alignment mark, a drive unit in a completely adjusted state can be obtained automatically. Further, as described above, the need for readjustment is eliminated, so that a coupling means (for example, D-cut, serration, spline, key, etc.) can be applied to the output shaft and the crank arm without fear of idling.

[0008]

FIG. 1 shows a wiper drive unit 1 according to the present invention.
FIG. 6 is a front view schematically illustrating a state in which a cover of a housing is removed, showing the example, and is a view corresponding to FIG. 5 according to a conventional example. This embodiment is an example in which the present invention is applied to the above-mentioned conventional example, and the same reference numerals as those in FIG. 5 denote the same or similar components as those in the above-mentioned conventional example. Next, FIG. 1 is different from FIG. 5, that is, matters improved by applying the present invention will be described. The first stage reduction receiving gear 6 fixed to the output shaft 7 'of this embodiment is provided with a matching mark A41. As described with reference to FIG. 6, a matching mark B42 is attached to the second-stage reduction receiving gear 9 to which the print circuit 10 is attached. In FIG. 1, the print circuit 10 is hidden by the second-stage reduction receiving gear 9 and cannot be seen by an operator, but the alignment mark B42 indirectly indicates the rotational angle position of the print circuit 10. FIG. 2 is an enlarged view of the vicinity of the pair of alignment marks. FIG. 3 is an external view of the drive unit in the above embodiment, and corresponds to FIG. 8 in the conventional example. As shown in FIG. 3, two parallel surfaces are cut at the end of the output shaft 7 ', and the output shaft 7' is fitted to the crank arm 32 'so as not to rotate substantially.
And, a matching projection 43 is provided on the crank arm 32 '.
The alignment mark 44 is provided on the housing 1 of the drive unit.
Each is attached. These alignment projections and alignment marks are used to confirm that there is no erroneous assembly in the timing mechanism after the assembly is completed. Wiper drive unit of the present embodiment having the configuration described above (FIGS. 1 to 3)
When assembling, as shown in FIG. 1 and FIG. 2, the gears and the like are engaged so that the alignment mark A41 and the alignment mark B42 face each other, and further, the alignment mark 44 and the alignment projection are formed. If the wiper assembly automatically stops when it is confirmed that it faces the mirror 43, the wiper assembly stops at a position offset from the edge of the mirror without being located at the center of the mirror.

[0009]

When the present invention is applied, the angular positional relationship between the receiving gear fixedly mounted with the switching mechanism member and driven and rotated and the output shaft fixed with the original gear driving the receiving gear,
Since it is possible to easily assemble together by the alignment mark, it is not necessary to readjust the assembly once it is assembled, and if the assembly is assembled with the alignment mark, a drive unit in a fully adjusted state can be obtained automatically. Furthermore, since the readjustment is not required as described above, the output shaft and the crank arm can be applied with a coupling means (for example, a D-cut, a serration, a spline, a key, or the like) that is not likely to idle. It has an effective effect.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a wiper drive unit according to an embodiment of the present invention with a cover of a housing removed, and is a view corresponding to FIG. 5 according to a conventional example.

FIG. 2 is an enlarged front view of the vicinity of a pair of alignment marks in the embodiment shown in FIG.

FIG. 3 is an external view of a drive unit in the embodiment, and corresponds to FIG. 8 in a conventional example.

FIG. 4 is an overall exploded perspective view of an automobile mirror wiper shown as an example of a wiper device.

FIG. 5 is a front view schematically showing a conventional example of an automobile wiper device provided with a control mechanism configured to intermittently rotate an output shaft, with a housing lid removed; .

FIG. 6 is a cross-sectional view of the wiper device for a vehicle having the control mechanism of the above-described conventional example, taken along a plane AA in FIG.

FIG. 7 is a wiring diagram of electric components constituting the conventional wiper control mechanism shown in FIGS. 5 and 6;

FIG. 8 is an external view of a driving unit in the conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Driving motor, 3 ... Worm, 4
... Worm wheel, 5 ... First reduction gear, 6 ... First
Stage reduction receiving gear, 7: output shaft, 8: second stage reduction base gear, 9
... 2nd stage reduction receiving gear, 21 ... Mirror housing, 22 ...
Mirror, 23 rim, 24 bearing hole, 26 wiper assembly, 27 wiper arm, 28 nut, 29 wiper cover, 30 driven lever, 31 drive unit, 32
... Crank arm, 33 ... Connecting rod, 41 ... Alignment mark A, 42 ... Alignment mark B, 43 ... Alignment projection, 4
4 ... alignment mark.

Claims (1)

(57) [Scope of request for utility model registration] 1. A drive unit for a wiper having an output shaft rotatably driven by a drive motor via a reduction gear mechanism, wherein (a) the drive unit is attached to the output shaft and belongs to the reduction gear mechanism. (B) a receiving gear that does not belong to the reduction gear mechanism and that is rotated by meshing with the above-mentioned source gear;
(C) a switching mechanism member that is fixed to the receiving gear and rotates integrally with the receiving gear to open and close a power supply circuit of the drive motor. For each of the fixed rotating members,
A wiper drive unit characterized by having matching marks that correspond to each other.