JPH0367754A - Motor for driving wiper - Google Patents

Abstract

PURPOSE:To accurately actuate a wiper by means of a simple device by rotating a contact plate by means of a motor via a gear wheel, the contact plate being provided with a moving contact of a pattern such that its state of contact with plural fixed contacts is varied by rotation. CONSTITUTION:The worm gear 14 of a gear portion 10B is formed at the end of the rotary shaft 12 of a motor portion 10A and a gear wheel 16 meshes therewith. A crank arm 22 is connected to the end of the shaft 20 of the gear wheel 16. A disc-shaped contact plate 24 is arranged on the opposite side of the gear wheel 16 and is supported in such a manner as being freely rotated with respect to a cover 18. A pair of projecting portions 34, 36 are provided on that face of the plate 24 which is on the side of the gear wheel 16, and the plate 24 is rotated in conjunction with the gear wheel 16 by engagement of the pair of projecting portions with an actuating protrusion 38 formed on the gear wheel 16, and rotation of the plate 24 causes a moving contact 40 located on the side of the plate 24 to sequentially change its state of contact with fixed contacts 48 to 58 on the side of the cover 18.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiper drive motor for rotating a vehicle wiper, and in particular, the present invention relates to a wiper drive motor for rotating a wiper for a vehicle. The present invention relates to a wiper drive motor.

[Prior Art] In order to rotate a vehicle wiper, a wiper drive motor is known that rotates itself back and forth in forward and reverse directions to rotate the wiper back and forth.

In this type of motor, a worm gear is formed on the motor rotation shaft, a gear wheel is meshed with the worm gear, and a crank arm for driving the wiper is connected to the rotation shaft of the gear wheel. There is. A cam contact (so-called cam pattern) is provided on the surface of the gear wheel so that it rotates together with the gear wheel.

The shape and position of the cam pattern including the cam contacts are provided corresponding to the reverse position, retracted position, or stop position of the wiper. For this reason, this cam contact makes it possible to detect a specific rotational position of the gear wheel (crank arm), that is, a reverse position, a retraction position, or a stop position of the wiper. Further, this motor is connected to a motor controller, and a rotational position detection signal from the cam contact is manually input.

When rotating the wiper back and forth, the motor controller switches the current direction (current direction) of the motor via a relay etc. based on the gear wheel rotation position detection signal from the cam contact, causing the motor itself to rotate forward or backward. Alternatively, the wiper may be stopped, and the wiper may be rotated back and forth, retracted, or stopped.

[Problems to be Solved by the Invention] However, in conventional wiper drive motors of this type, the cam contacts only detect the reverse position, retracted position, or stop position of the wiper; A motor controller was essential to control the The motor controller is expensive, and therefore the overall cost is high.

Furthermore, the relay contacts placed in such motor controllers have low durability (short lifespan) because they are repeatedly connected and disconnected many times when the wiper is activated.
〉Also, large motors for front window wipers require the use of large-capacity relays, and there are also drawbacks such as low flexibility in choosing where to apply them (for example, they can only be used for rear window wipers). there were.

Most importantly, the motor controller rotates the motor (gear wheel) forward, reverse, or stops based on a detection signal such as the reverse position of the wiper from the cam contact, so the wiper can be reversed or stopped at an accurate position. It is difficult to get the right timing, and the accuracy of the wiper's reciprocating rotation is relatively low.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a wiper drive motor that can reciprocate a wiper at low cost and with high precision, and has a high degree of freedom in selecting application locations.

[Means for Solving the Problems] The wiper drive motor of the invention according to claim (1) includes a rotating gear wheel that rotates together with a motor rotating shaft and is connected to a wiper, and a rotating gear wheel that accommodates the rotating gear wheel and is connected to a wiper. a wiper drive motor for rotating the wiper back and forth in response to the operation of a wiper switch, the wiper drive motor having one end fixed to the cover and the other end rotatably supporting the wiper. A fixed contact extending toward the gear wheel, and a fixed contact disposed between the rotating gear wheel and the cover so as to be rotatable relative to the rotating gear wheel, and contacting the fixed contact and responding to the wiper switch. a contact plate having a pattern of movable contacts for configuring an electric circuit on the cover side surface;
A projection formed on one of the contact plate and the rotating gear wheel to protrude toward the other, and a pair of abutting portions formed on the other of the contact plate corresponding to the projection, the rotating gear The rotary gear wheel and the contact plate are allowed to rotate relative to each other until these protrusions and the contact portion come into contact when the wheel rotates, and when the contact plate comes into contact, the contact plate rotates together with the rotary gear wheel. It is characterized by having the means and.

The wiper drive motor of the invention according to claim (2) is the wiper drive motor of the invention according to claim (1), wherein the pair of abutting portions are on the surface of the contact plate on the rotating gear wheel side. A pair of protrusions are formed to protrude toward the rotating gear wheel, and the protrusions are formed on a surface of the rotating gear wheel on the contact plate side to protrude toward the contact plate, and the protrusions are formed to protrude toward the contact plate as the rotating gear wheel rotates. It is characterized in that it is an operating protrusion that engages with either of the pair of protrusions and rotates the contact plate.

The wiper drive motor of the invention according to claim (3) is the wiper drive motor of the invention according to claim (1> or claim (2)), wherein the movable contacts provided on the contact plate are independent of each other. Equipped with an internal contact point and an external contact point,
During the wiper reciprocating operation, the inner contact point and the outer contact point begin to rotate together with the rotating gear wheel at a predetermined angle before the lower inversion position, and when the lower inversion position is reached, the abutment position with the fixed contact point is reached. They are characterized in that the directions of energization are switched in opposite directions.

The wiper drive motor of the invention according to claim (4) is the wiper drive motor of the invention according to claim (1), claim (2), or claim (3), wherein the wiper switch,
When the wiper is changed from the operation mode to the stop mode, current is continued in the same direction ignoring the change in the contact position between the inner and outer contacts and the fixed contact at the time when the wiper reaches the downward reverse position. The present invention is characterized in that it includes a stopping means for stopping the rotating gear wheel by stopping the energization when the rotating gear wheel has further rotated by a predetermined angle from the lower reversal position.

[Operation] In the wiper drive motor according to claim (1), when the rotary gear wheel rotates, the protrusion constituting the actuating means engages and presses one of the abutting portions, thereby rotating the contact plate. Move with gear wheel. For this reason,
A movable contact that constitutes an electric circuit corresponding to the wiper switch moves together with the contact plate, thereby changing the contact position with the fixed contact and automatically switching the direction of energization to the motor. Therefore, the motor automatically rotates back and forth in the forward and reverse directions according to the wiper switch without using other parts such as a motor controller.

Further, in the wiper drive motor according to claim (2), when the rotating gear wheel rotates, the operating protrusion engages with and presses one of the protrusions, thereby moving the contact plate together with the rotating gear wheel. Therefore, the movable contacts forming an electric circuit corresponding to the wiper switch move together with the contact plate, thereby changing the contact position with the fixed contacts, and automatically switching the direction of energization to the motor. Therefore, in this case as well, the motor automatically rotates back and forth in the forward and reverse directions according to the wiper switch, without using other parts such as a motor controller.

On the other hand, in the wiper drive motor according to claim (3), during the wiper reciprocating operation, the inner contact point and the outer contact point begin to rotate together with the rotating gear wheel by the actuating means at a predetermined angle before the lower reversal position, and further, When the lower inversion position is reached, the contact positions with the fixed contacts are reversed and the current direction is switched. Therefore, the motor automatically rotates back and forth in forward and reverse directions.

The wiper drive motor according to claim (4), when the wiper switch is changed from the operating mode to the stop mode, changes the contact position of the inner contact, the outer contact, and the fixed contact when the wiper reaches the downward reverse position. Regardless of this, the previous energization is continued by the stopping means. Further, when the wiper has further rotated by a predetermined angle from the lower inversion position, the stopping means stops energization and stops the rotation, and the wiper is brought to a stopped and retracted position.

[Embodiment] FIG. 1 shows an overall perspective view of a wiper driving motor 10 according to the present invention. Also, in FIG. 2, the motor 10
An exploded perspective view of the main parts is shown.

The motor IO is composed of a motor section 10A and a gear section 10B connected to the motor section 10A. The rotating shaft 12 of the motor section 10A extends into the gear section 10B, and a worm gear 14 is formed at the tip. This worm gear 14 meshes with a rotating gear wheel 16 disposed within the gear portion 10B.

The rotating gear wheel 16 is rotatably supported by the cover 18 of the gear portion 10B, and a crank arm 22 is connected to the tip of the shaft 20.

Therefore, when the motor unit 10A operates and the rotating shaft 12 rotates, this rotational force is transmitted to the rotating gear wheel 16 via the worm gear 14, causing the rotating gear wheel 16 to rotate, and in turn, the crank arm 22 is axis 20
It is supposed to rotate around.

A contact plate 24 is arranged between the rotating gear wheel 16 and the cover 18. The contact plate 24 has a substantially disk shape, and a protrusion 26 that protrudes toward the cover 18 is formed in the center. A through hole 28 is formed in the protruding portion, and a support shaft 30 protruding from the cover 18 is fitted into the through hole 28. Furthermore, a tooth washer 32 is press-fitted into the support shaft 30, and the contact plate 2
4 is rotatably supported by the cover 18. Therefore, the contact plate 24 can also rotate relative to the rotating gear wheel 16. In addition,
This contact plate 24 is prevented from inadvertent rotation by the pressing force of a fixed contact provided on the cover 18, which will be described later.

As shown in detail in FIG. 4, a pair of convex portions 34 and 36 constituting actuating means are formed on the surface of the contact plate 24 on the rotating gear wheel 16 side so as to protrude toward the rotating gear wheel 16. On the other hand, on the surface of the rotating gear wheel 16 on the contact plate 24 side, as shown in FIG.
An operating protrusion 38 constituting an operating means is formed to protrude toward the contact plate 24 in correspondence with the pair of protrusions 34 and 36. The operating protrusion 38 can engage with either of the pair of protrusions 34, 36 as the rotary gear wheel 16 rotates.
When the rotary gear wheel further rotates with the contact plate 24 in contact with any of the convex portions 34, 36, the contact plate 24 also rotates together with the rotary gear wheel.

Cover 18 side of contact plate 24 (pair of protrusions 3
A moving contact 40 is provided on the surface opposite to 4.36. As shown in detail in FIG. 3, the movable contacts 40 are formed in a pattern, with inner contacts 42 and outer contacts 4 independent of each other.
4 and a contact plate 24.
Rotate and move with.

The inner contact point 42 extends radially outward from the innermost part 42A closest to the protrusion 26 of the contact plate 24 to the first protrusion 4.
2B is formed protrudingly, a second protrusion 42C is formed to protrude from substantially the opposite side of the first protrusion 42B, larger than the first protrusion 42B, and a third protrusion 42C is formed in an arc shape from the second protrusion 42C. A portion 42D is formed to protrude. On the other hand, the external contact 44 is located between the first protrusion 42B and the third protrusion 42D in the radial direction of the contact plate 24.
44A is arranged, and the fourth protrusion 44A has the same radius as the first protrusion 42B.
A protrusion 44B is formed to protrude radially inward, and further includes:
A fifth protrusion 44C is formed to protrude radially outward at the same radius as the third protrusion 42D.

This movable contact 40 and a fixed contact, which will be described later, constitute an electric circuit corresponding to a wiper switch 46 (see FIG. 7).

Between the movable contact 40 of the contact plate 24 and the cover 18, as shown in FIG. 6, there are six contact levers as fixed contacts, that is, an R contact lever 48,
G contact lever 50, LB contact lever 52,
A B contact lever 54, a Y contact lever 56, and a W contact lever 58 are arranged. Each contact lever has one end fixed to the inner circumferential wall of the cover 18, the other end extending toward the contact plate 24, and the tip abutting the movable contact 40 (or the surface of the contact plate 24). .

Next, the configuration of the electric circuit will be explained.

FIG. 7 schematically shows the configuration of the electric circuit of the motor 10.

The R contact lever 48 is connected to the + side of the power supply via the INT relay 60, and the tip thereof is always in contact with the external contact 44 of the contact plate 24. Further, the B contact lever 54 is grounded, and the tip thereof is always in contact with the inner contact point 42 of the contact plate 24. The G contact lever 50 is connected to the ■NT circuit 62 via the wiper switch 46, and its tip can come into contact with the internal contact point 42 of the contact plate 24.

On the other hand, the LB switch lever 52 is connected to the wiper switch 46.
It is connected to the L terminal 64 of the motor section 10A through the contact plate 24, and the tip can come into contact with either the inner contact 42 or the outer contact 44 of the contact plate 24.

Further, the Y contact lever 56 is also connected to the L terminal 64 of the motor section 10A via the wiper switch 46.
The tip portion can come into contact with either the inner contact point 42 or the outer contact point 44 of the contact plate 24 . The W contact lever 58 is also connected to the LR terminal 66 and LW terminal 68 of the motor section 10A via the wiper switch 46, and the tip end is connected to either the inner contact 42 or the outer contact 44 of the contact plate 24 and the Y contact lever 58. contact lever 5
It is possible to contact a person different from 6. That is, the Y contact lever 56 and the W contact lever 58 are connected to the inner contact point 4.
2 and external contact 44, which are different from each other.

Note that the wiper switch 46 shown in FIG. 7 and FIGS. 9 to 20 is the same as the wiper switch 46 in each figure.
This indicates that the connection line on the upper side and the connection line on the lower side are closed at the portion corresponding to the "○" mark. For example, when the switch is set to the "INT" position, the connection circuit between the G contact lever 50 and the 1.NT circuit 62 is closed, and the connection between the Y contact lever 56 and the W contact lever 58 and the motor section 10A is closed. Indicates that the circuit is closed.

As schematically shown in FIG. 8, the crank arm 22 of the motor 10 configured as described above has one end of a link rod 70 connected to its tip, and the other end of the link rod 70 is connected to one end of a segment 72. is connected to. The other end of this segment 72 is fixed to a rotating shaft of a wiper 74. Therefore, the motor 10 operates and the crank arm 22
When the wiper 74 rotates, this rotational force is transmitted to the wiper 74, causing the wiper 74 to rotate.

Next, the operation of this embodiment will be explained.

9 to 20 show the operating state of the motor 10 (the movable contact 40 of the contact plate 24, the operating projection 38, the crank arm 22, etc.). In each figure, the portion of each connection line that is closed (energized) by the wiper switch 46 is indicated by a solid line.

Further, FIG. 8 schematically shows the corresponding state of operation of the motor 10 and the wiper. Note that clockwise rotation in each figure is defined as forward rotation of the motor 10 (motor unit 10A), and counterclockwise rotation is defined as reverse rotation of the motor 10.

FIG. 9 shows the states of the movable contact 40, operating protrusion 38, etc. of the contact plate 24 when the wiper switch 46 is in the 0FFJ position (see arrow SW) and the wiper 74 is retracted. , motor part 1
The 0A L terminal 64 is connected to the LB terminal via the wiper switch 46.
Connected to the contact lever 52 and further connected to the inner contact 42
and is grounded by the B contact lever 54. On the other hand, the LW terminal 68 of the motor section 10A is
It is grounded via a wiper switch 46. Therefore, the motor section 10A is in a stopped state. In this state, the Y contact lever 56 is in contact with the inner contact point 42 of the contact plate 24, and the W contact lever 58 is in contact with the outer contact point 44 of the contact plate 24.

Next, as shown in FIG. 10, the wiper switch 46 is set to rL.
When operated to the OWJ position, the LW terminal 68 of the motor section 10A is connected to the W contact lever 58 via the wiper switch 46.

Here, the W contact lever 58 includes the outer contact 44 of the contact plate 24, the R contact lever 48, and the IN
T! Since it is connected to the + side of the power supply via the J-ray 60, the LW terminal 68 of the motor section 10A is in the "+" state.

On the other hand, the L terminal 64 of the motor section 10A is connected to the Y contact lever 56 via the wiper switch 46. Here, since the Y contact lever 56 is grounded via the inner contact 42 of the contact plate 24 and the B contact lever 54, the L terminal 64 of the motor section 10A is in the "-" state.

Therefore, as shown in FIG. 10, the motor section 10A operates (forwardly rotates), and the rotary gear wheel 16, together with the crank arm 22 and the operating protrusion 38, begins to rotate clockwise in FIG. 10 (in the direction of arrow CW force).

Therefore, the wiper 74 is also in the retracted position (position A in FIG. 8).
It moves from there to the lower reversal position (position B in FIG. 8), and then sequentially rotates. In this case, even if the rotating gear wheel 16 starts to rotate in the direction of the arrow CW force shown in FIG.
4), even if the rotary gear wheel 16 rotates, the contact plate 24, that is, the inner contact point 42 and the outer contact point 44, remain in a stopped state.

As shown in FIG. 11, when the rotating gear wheel 16 has rotated 180 degrees clockwise from the stop position together with the crank arm 22 and the operating protrusion 38, the wiper 74 reaches the upper rotation position (position C in FIG. 8). , crank arm 22
It is reversed as the . At this point, the contact plate 24 (inner contact 42 and outer contact 44) still remains in a stopped state.

When the rotation of the motor section 10A further progresses and the rotating gear wheel 16 is rotated approximately 300 degrees clockwise from the stop position (storage position) together with the crank arm 22 and the operating protrusion 38, the rotating gear wheel 16 rotates together with the rotating gear wheel 16. The protrusion 38 is located on one convex portion 3 of the contact plate 24.
4 and presses it, causing the contact plate 24 to rotate together with the rotating gear wheel 16.

Therefore, the inner contact point 42 and the outer contact point 44 rotate, and Y
The contact position with the contact lever 56 and the W contact lever 58 is changed. That is, in this state, the Y contact lever 56 that was in contact with the first protrusion 42B of the inner contact 42 comes into contact with the fourth protrusion 44B of the outer contact 44 due to the movement of the contact plate 24, and on the other hand, The W contact lever 58 that was in contact with the fifth protrusion 44C of the outer contact 44 is moved to the third protrusion 42D of the inner contact 42 due to the movement of the contact plate 24.
(the state shown in FIG. 12).

Therefore, the Y contact lever 56 is connected to the outer contact point 44, R
It is connected to the + side of the power supply via the contact lever 48 and the INT relay 60, and the L terminal 64 of the motor section 10A is in the "+" state, contrary to the above-mentioned state. Further, the W contact lever 58 is grounded via the inner contact 42 and the B contact lever 54, and the LW terminal 68 of the motor section 10A is in the "-" state.

That is, the direction of energization to the motor section 10A is switched.

Therefore, the motor section 10A operates in the opposite direction to that described above and rotates in the opposite direction), and the rotating gear wheel 16 rotates in the opposite direction to the crank arm 2.
2 and the operating projection 38 begin to rotate counterclockwise in FIG. Therefore, the wiper 74 is also reversed from the lower reversed position and sequentially rotated. In this case, when the rotating gear wheel 16 rotates in the counterclockwise direction in FIG. Even if the contact plate 2 is moved counterclockwise in FIG.
4, that is, the inner contact 42 and the outer contact 44 remain in a stopped state. In other words, the Y contact lever 56 remains in contact with the outer contact 44, and the W contact lever 58 remains in contact with the inner contact 42. Therefore, the motor section 10A continues to rotate without stopping.

The reverse rotation of the motor section 10A progresses, and as shown in FIG. , to 18
When the wiper 74 reaches the 0 degree rotation position, the wiper 74 again reaches the upper rotation position and is reversed as the crank arm 22 rotates. At this point, the contact plate 24 (
The inner contact 42 and the outer contact 44) remain in a stopped state.

Further, the reverse rotation of the motor section 10A progresses, and the rotary gear wheel 16 is rotated approximately 150 degrees together with the crank arm 22 and the operating protrusion 38 (that is, the motor section 10A
When the operating projection 38, which rotates together with the rotary gear wheel 16, comes into contact with the other protrusion 36 of the contact plate 24, as shown in FIG. Press to rotate the contact plate 24 in the opposite direction (counterclockwise) together with the rotating gear wheel 16.

Therefore, the inner contact point 42 and the outer contact point 44 rotate, and Y
The contact position with the contact lever 56 and the W contact lever 58 is changed. That is, in this state, the Y contact lever 56, which was in contact with the fourth protrusion 44B of the outer contact 44, comes into contact with the first protrusion 42B of the inner contact 42 due to the movement of the contact plate 24, and on the other hand, The W contact lever 58 that was in contact with the third protrusion 42D of the inner contact 42 is moved to the fifth protrusion 44C of the outer contact 44 due to the movement of the contact plate 24.
comes into contact with.

Therefore, the W contact lever 58 is connected to the outer contact point 44, R
It is in a state where it is connected to the + side of the power supply via the contact lever 48 and the INT relay 60, and the LW terminal 68 of the motor section 10A is in the "+" state, contrary to the above-mentioned state. Further, the Y contact lever 56 is grounded via the internal contact 42 and the B contact lever 54, and the L terminal 64 of the motor section 10A is in the "-" state.

That is, the direction of energization to the motor section 10A is switched.

Therefore, the motor section 10A operates in the opposite direction to that described above, that is, rotates forward again), and the rotary gear wheel 16 begins to rotate clockwise in FIG. 14 together with the crank arm 22 and the operating protrusion 38. Therefore, the wiper 74 is also reversed from the lower reversed position and sequentially rotated. In this case, when the rotating gear wheel 16 rotates clockwise in FIG.
Even if it moves clockwise in the figure, it simply moves away from the convex portion 36, and the contact plate 24, that is, the internal contact point 4
2 and the external contact 44 remain in a stopped state. In other words, the W contact lever 58 remains in contact with the outer contact 44, and the Y contact lever 56 remains in contact with the inner contact 42. Therefore, the motor section 10
A continues to rotate without stopping.

Thereafter, the above-described process is repeated, and the wiper 74 is automatically rotated back and forth.

Next, the operation when stopping and retracting the wiper 74 will be explained.

As described above, when the motor 10 (motor section 10A) rotates in reverse during normal operation of the wiper 74, the Y contact lever 56 comes into contact with the fourth protrusion 44B of the external contact 44, as shown in FIG. state and the L of the motor section 10A
The terminal 64 is in the "+" state, while the W contact lever 58 is in contact with the third protrusion 42D of the internal contact 42, and the LW terminal 68 of the motor section 10A is in the "-" state.

Here, as shown in FIG. 16, the wiper switch 46 is
When operated to the OFFJ position, the L terminal 64 of the motor section 10A is connected to the LB switch lever 52 via the wiper switch 46.

Here, the LB contact lever 52 includes the outer contact 44 of the contact plate 24, the R contact lever 48, and the I contact lever 52.
Since it is connected to the + side of the power supply via the N T 17 relay 60, the L terminal 64 of the motor section 10A is still "
+" status remains. On the other hand, LWl of the motor section 10A
The LW terminal 68 of the motor section 10A remains in the "-" state because it is grounded via the six-child, eight-child wiper switch 46. Therefore, the motor section 10A continues to rotate in reverse.

The reverse rotation of the motor section 10A progresses, and the rotating gear wheel 1
6 together with the crank arm 22 and the operating protrusion 38 rotates approximately 30 degrees clockwise from the stop position of the motor section 10A (i.e., the lower reversed position of the wiper 74), the operating protrusion 38 rotating together with the rotating gear wheel 16 comes into contact with the rotating gear wheel 16. The convex portion 36 of the plate 24 is still contacted and pressed, causing the contact plate 24 to rotate in the opposite direction (counterclockwise) together with the rotating gear wheel 16. Therefore, the inner contact point 42 and the outer contact point 44 rotate and change the contact position with each contact lever. That is, in this state, the Y contact lever 56, which was in contact with the fourth protrusion 44B of the external contact 44, is in contact with the contact plate 2.
4 came into contact with the first protrusion 42B of the inner contact 42, and on the other hand, the W contact lever 58, which had been in contact with the third protrusion 42D of the inner contact 42, came into contact with the outer contact due to the movement of the contact plate 24. 44 (state shown in FIG. 16).

However, in this state, the Y contact lever 56
Since the wiper switch 46 and the W contact lever 58 are both open, they are not connected to the motor section 10A. On the other hand, the L terminal 64 of the motor section 10A is still connected to the LB contact lever 52 via the wiper switch 46, and the outer contact 44 of the contact plate 24, the R contact lever 48, and the INT relay 60
Since it is connected to the power supply + side via
A's L terminal 64 remains in the "+" state.

Furthermore, since the LW terminal 68 of the motor section 10A is still grounded via the wiper switch 46,
The LW terminal 68 of the motor section 10A remains in the "-" state. Therefore, the motor section 10A continues to rotate in reverse.

When the motor unit 10A continues to rotate in the reverse direction, the operating protrusion 38 formed on the rotating gear wheel 16 further presses the protrusion 36 of the contact plate 24, and the contact plate 2
4 in the opposite direction with the rotating gear wheel 16 (arrow CCW
direction) (as shown in Fig. 17). For this reason,
The inner contact point 42 and the outer contact point 44 rotate and move, and the contact position with each contact lever is changed sequentially, but the wiring (connection)
The situation is the same as that shown in FIG.

The reverse rotation of the motor section 10A progresses until it reaches the stop position (wiper 74
18), the LB switch lever 52, which had been in contact with the base 44A of the outer contact 44, comes into contact with the second protrusion 42C of the inner contact 42. , the L terminal 64 of the motor section 10A is
It is grounded by the wiper switch 46, the LB contact lever 52, the inner contact 42, and the B contact lever 54. On the other hand, the LW terminal 68 of the motor section 10A remains grounded via the wiper switch 46. Therefore, the motor section 10A stops (
(dynamic braking), and the wiper 74 enters the retracted state.

In this way, the motor 10 has moving contacts 40 (inner contacts 42
By periodically moving the external contact point 44) together with the contact plate 24, the direction of energization to the motor section 10A is automatically switched, and the motor section 10A automatically rotates back and forth.

Note that the above-mentioned operation is performed when the wiper switch 46 is rLOWJ.
Although the description has been made for the case where the wiper switch 46 is operated to the "rHIGH" position and the wiper 74 is operated at "high speed", the motor unit 10A operates in the same manner as described above even when the wiper switch 46 is operated to the "rHIGH" position and the wiper 74 is operated at "high speed". Automatically rotates back and forth. That is, in this case, when the wiper switch 46 is operated to the HIGHJ position, the LR terminal 66 of the motor section 10A is separated by 8 and the LR terminal 66 is in a connected state (energized state), and the only difference is the circuit resistance. , the basic operation is the same as the operation described above.

Next, the operation of the wiper 74 during "intermittent operation" will be explained.

As shown in FIG. 19, when the wiper switch 46 is operated to the rINTJ position in order to "intermittently operate" the wiper 74, the motor 10 basically moves when the wiper switch 46 is in the rLOWJ position or the rHIG, HJ position. The moving contact 40 (inner contact 42
and external contact 44) move periodically together with the contact plate 24, the direction of energization to the motor section 10A is automatically switched, and the motor section 10A automatically rotates back and forth.

Here, as shown in FIG. 19, when the rotating gear wheel 16 is rotated approximately 300 degrees clockwise from the stop position together with the crank arm 22 and the operating protrusion 38 while the motor unit 10A is rotating, the rotating gear wheel 16 An actuating protrusion 38 rotating together with the contact plate 24 contacts and presses one convex portion 34 of the contact plate 24, causing the contact plate 24 to rotate together with the rotating gear wheel 16.

Therefore, the inner contact point 42 and the outer contact point 44 rotate, and Y
The contact position with the contact lever 56 and the W contact lever 58 is changed. That is, in this state, the Y contact lever 56 that was in contact with the first protrusion 42B of the inner contact 42 comes into contact with the fourth protrusion 44B of the outer contact 44 due to the movement of the contact plate 24, and on the other hand, The W contact lever 58 that was in contact with the fifth protrusion 44C of the outer contact 44 is moved to the third protrusion 42D of the inner contact 42 due to the movement of the contact plate 24.
comes into contact with.

Furthermore, in this state, G was in contact with the non-contact portion (the outer peripheral surface of the contact plate 24) between the inner contact 42 and the outer contact 44 without contacting either the inner contact 42 or the outer contact 44. The contact lever 50 comes into contact with the first protrusion 42B of the internal contact 42 due to the movement of the contact plate 24. Therefore, the G contact lever 58 connects to the B contact lever 54 via the internal contact point 42.
The INT circuit 62 is connected to the ground via the wiper switch 46, the G contact lever 58, the inner contact 42, and the B contact lever 54, and is energized (operated).

For this reason, INT! J Ray 60 is switched properly)
)), the connection between the R contact lever 48 and the power source is cut off. Therefore, the power to the motor section 10A is cut off, and the motor section 10A temporarily stops.

After a predetermined time (time constant of the INT circuit 62), the second
INT again as shown in Figure 0! (The J-ray 60 is properly switched) and the R contact lever 48 is connected to the + side of the power supply. Therefore, power supply to the motor section 10A is restarted. In this state, the L terminal 64 of the motor 110A is connected to the wiper switch 46, the Y contact lever 56, and the external contact 4.
4.R contact lever 48 and INT relay 60
The terminal is connected to the + side of the power supply via the terminal, and becomes in the "+" state. In addition, the motor 81OA's LWi element 6 elements separated 8 wiper switch 46, W contact lever 58, internal contact 4
2 and B contact lever 54, and is in a "-" state. Therefore, the motor unit 10A rotates in the reverse direction and operation is resumed), and the rotary gear wheel 16 rotates in the counterclockwise direction in FIG. 20 together with the crank arm 22 and the operating projection 38. Therefore, the wiper 74 is also reversed from the lower reversed position and sequentially rotated.

In this way, when the wiper switch 46 is operated to the r I NTJ position and the wiper 74 is operated intermittently, the G contact lever 50 comes into contact with the internal contact 42 due to the movement of the contact plate 24, and the INT relay 6
0 is activated, the motor section 10A is automatically energized for a predetermined period of time, and the motor 10 is intermittently activated.

As described above, the motor 10 has the movable contact 40 (inner contact 42
and external contact 44> periodically move together with the contact plate 24, the direction of energization to the motor section 10A is automatically switched, and the motor section 10A automatically rotates back and forth.
Other parts such as an expensive motor controller, which were essential in conventional wiper drive motors, are no longer necessary, resulting in extremely low costs. Furthermore, the movable contact 40 (inner contact 42 and outer contact 44) rotates together with the crank arm 22 connected to the wiper 74 to switch the direction of energization to the motor section 10A, and to reverse or stop the wiper 74. This makes it easier to take the timing of the wiper 74.
The accuracy of reciprocating rotation is improved. Furthermore, motor section 10A
Switching of the direction of energization to
Since this is done using each contact lever, it is possible to eliminate the motor controller and reduce the number of parts such as relays, so it can be applied even to large motors that flow large currents, and there is freedom in selecting the application location to drive the wiper. The degree also increases.

[Effects of the Invention] As explained above, the wiper drive motor according to the present invention has
It is possible to reciprocate the wiper with high accuracy at low cost, and it also has the effect of increasing the degree of freedom in selecting the application location.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a wiper drive motor according to the present invention, FIG. 2 is an exploded perspective view of essential parts of the wiper drive motor, and FIG.
The figure is a front view of the contact plate showing the moving contacts, No. 4
Figure 5 is a perspective view of the contact plate showing a pair of protrusions, Figure 5 is a front view of the rotating gear wheel showing the operating protrusion, Figure 6
The figure is a back view of the cover showing the contact lever, Figure 7 is a configuration diagram of the electric circuit of the wiper drive motor, Figure 8 is a schematic configuration diagram showing the correspondence between the wiper drive motor and the wiper operation, and Figure 9 20 through 20 are operational diagrams showing the operating states of the wiper drive motor. DESCRIPTION OF SYMBOLS 10... Motor, 10A... Motor part, 10B... Gear part, 12... Rotating shaft, 16... Rotating gear wheel, 18... Cover 22... Crank arm, 24...・Contact plate, 34. 36... Protrusion (operating means), 38... Operating projection (operating means), 40... Moving contact, 42... Inner contact, 44... Outer contact, 46 ...Wiper switch, 48...R contact lever (fixed contact), G contact LB contact B contact Y contact W contact lever (fixed contact), Trevor (fixed contact), Lever (fixed contact), Lever (fixed contact) ), lever (fixed contact).

Claims (4)

[Claims] (1) having a rotating gear wheel that rotates together with a motor rotating shaft and to which a wiper is connected; and a cover that accommodates the rotating gear wheel and rotatably supports the rotating gear wheel;
A wiper drive motor for reciprocally rotating the wiper in accordance with the operation of a wiper switch, the motor comprising: a fixed contact having one end fixed to the cover and the other end extending toward the rotating gear wheel; A pattern-shaped movable contact is disposed between the gear wheel and the cover so as to be rotatable relative to the rotating gear wheel, and is in contact with the fixed contact and forms an electric circuit according to the wiper switch with the fixed contact. a contact plate provided on a surface of the rotary gear wheel; a protrusion formed on one of the contact plate and the rotating gear wheel to protrude toward the other; and a pair of abutments formed on the other in correspondence with the protrusion. a contact portion, and allows the rotating gear wheel and the contact plate to rotate relative to each other until the protrusions and the contact portion come into contact when the rotating gear wheel rotates, and in the abutting state, the contact plate A wiper drive motor comprising: an actuating means for rotating together with a rotating gear wheel; and a wiper drive motor. (2) The pair of abutting portions are a pair of convex portions formed on a surface of the contact plate on the rotating gear wheel side to protrude toward the rotating gear wheel, and the protrusions include:
An operating protrusion is formed on a surface of the rotating gear wheel on the contact plate side to protrude toward the contact plate and engages with either of the pair of convex portions to rotate the contact plate as the rotating gear wheel rotates. A wiper drive motor according to claim (1). (3) The movable contact provided on the contact plate includes an inner contact point and an outer contact point that are independent of each other, and the inner contact point and the outer contact point are rotated at a predetermined angle before the lower inverted position during the wiper reciprocating operation. Claim (1) or Claim (2) characterized in that when the gear wheel begins to rotate together with the gear wheel and reaches the lower inversion position, the contact positions with the fixed contact become opposite to each other and the energization direction is switched.
) wiper drive motor. (4) When the wiper switch is changed from the operation mode to the stop mode, when the wiper switch reaches the downward reverse position, the contact position change operation between the inner and outer contacts and the fixed contact is ignored and the wiper switch is moved in the same direction. Claim (1), claim (2), or the like, characterized in that the rotating gear wheel is further provided with a stopping means that continues energization and stops the energization when the rotary gear wheel is further rotated by a predetermined angle from the lower inverted position. Claims (
3) The wiper drive motor described.