JPH0437004Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a power transmission mechanism for a wiper device that wipes away raindrops and dust attached to a glass surface, and in particular, the invention relates to a power transmission mechanism for a wiper device that wipes away raindrops and dust attached to a glass surface. This relates to the pivot arm.

(Prior art) Conventionally, the above-mentioned pivot arm was
For example, there was a structure shown in Fig. 4.

That is, the shaft portions of the ball pins 102a and 102b and the shaft portion of the pivot 103 are fitted into predetermined positions of the pivot arm 101, and the pivot arm 1
Each ball pin 1 protrudes from the opposite side of 01.
02a, 102b and the shaft portion of the pivot 103 are crimped and fixed using a crimping machine or the like.
In the case of the power transmission mechanism of the wiper device shown in the figure, the first
As described above, the pivot arm 101 has ball pins 10 on both sides of the first pivot arm 101.
2a and 102b are fixed, and the second pivot arm 105 has a ball pin 102c fixed on one side thereof. The power of the wiper motor is converted into a reciprocating linear motion by a first link connecting rod 111 pivotally connected between the motor arm 110 and the first pivot arm, causing the first pivot 103 to reciprocate. Furthermore, a second pivot arm pivotally connected between the first pivot arm 101 and the second pivot arm 105
The link connecting rod 112 rotates the second pivot 113 back and forth. That is, each pivot 103,1
Each wiper arm 12 is fixed to the tip of 13.
0,121 is reciprocated to wipe away raindrops, dust, etc. adhering to the glass surface.

(Problem to be solved by the invention) However, in the conventional pivot arms 101 and 105 described above, each of the wiper arms 12
0 and 121 are locked by an external force (such as snow), the power of the wiper motor is transferred to each pivot 10 fixed to each pivot arm 101 and 105.
3,113, each of the pivots 10
3, 113 may lead to torsional failure, and each pivot arm 101, 105 and each pivot 1
There was a problem in that the caulked portions between the pivots 103 and 113 were weakened and the respective pivots 103 and 113 could spin idly.

The present invention was developed by focusing on the above-mentioned conventional problems. When the wiper arm is locked by an external force, the power of the wiper motor is released, and when the wiper arm is released from the locked state, the wiper motor is quickly activated. The object is to provide a pivot arm that can transmit power to the pivot.

[Structure of the invention] (Means for solving the problem) The structure of the pivot arm according to the present invention for achieving the above object is such that the pivot arm converts reciprocating linear motion into reciprocating rotational motion of the pivot. A first driven part for transmitting motion is rotatably attached to the pivot, a second driven part for reciprocating the pivot is fixed to the pivot, and one of the first driven part and the second driven part is fixed to the pivot. One of the driven parts includes a compression spring constituting a torque transmission clutch that transmits and interrupts the reciprocating linear motion transmitted to the first driven part to a second driven part, and a compression spring configured to rotate the reciprocating linear motion transmitted to the first driven part in the radial direction of the pivot. A stopper is provided with a moving force of 1, and the other driven part is provided with a spring pressure accumulation that is non-concentric with the pivot and is formed continuously with the groove in which the stopper engages and the slope for removing the stopper of the groove. The present invention is characterized by the provision of a plate which also constitutes a torque transmission clutch and has a surface.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 3 are diagrams showing an embodiment of the present invention.

That is, the reference numeral 1 in the figure is a pivot arm equipped with a pivot 2. This pivot arm 1
A first driven part 3 to which the power of the wiper motor is transmitted, a second driven part 4 to which the pivot 2 is caulked and fixed, and a second driven part 4 to which the power of the wiper motor transmitted to the first driven part 3 is transmitted. 4 and a torque transmission clutch 5 for transmitting and cutting off the torque.

The first driven part 3 is rotatably attached to the pivot 2 via a metal bearing 16, and has a first ball pin 10a used for transmitting the power of the wiper motor, as shown in FIG. had the first
a driven arm 11 and the first driven arm 11
It consists of a base 12 to which is screwed, and a holder 15 which is screwed to the base 12 and accommodates a compression spring 13 and a stopper 14 constituting the torque transmission clutch 5. In this case, the compression spring 13 applies a force to the stopper 14 to move it in the radial direction of the pivot 2 and outward.

Further, the second driven part 4 is connected to a wiper motor which is crimped and fixed to the pivot 2 as shown in FIG. 3 and is transmitted to a second pivot arm 105 shown in FIG. 5 via the first driven part 3. a second driven arm 21 having a second ball pin 10b used to transmit power; a cover 22 screwed onto the second driven arm 21;
The compression spring 13 and the stopper 14 together constitute the torque transmission clutch 5. In this case, the plate 25 includes a groove 23 having a disengagement slope 23a that engages with the tip of the stopper 14 and facilitates detachment of the stopper 14;
A spring pressure accumulation surface 24 is formed continuously on the detachment inclined surface 23a of the groove 23, and the spring pressure accumulation surface 24 is not concentric with the pivot 2, but has a curved shape that approaches the pivot 2 as it moves away from the groove 23. By forming the stopper 1
4 is released from the groove 23, the compression spring 13
By compressing more through the stopper 14, it is possible to apply a force to the stopper 14 to move it back toward the groove 23 side.

Note that a wall surface 24a concentric with the pivot 2 is formed on the opposite side of the groove 23 from the detachment inclined surface 23a.

The first driven portion 3 and the second driven portion 4 are provided in an overlapping state with a spacer 30 fitted to the pivot 2 interposed therebetween.

a base 12, a compression spring 13, a stopper 14 and a holder 15 of the first driven part 3;
The torque transmission clutch 5, which is composed of the plate 25 of the second driven part 4, is configured so that when the pivot 2 and the second driven arm 21 are in a locked state due to a load such as an external force, that is, the plate 25 is also in a locked state. In this embodiment, when the stopper 14 is engaged with the groove 23 of the plate 25, as shown in FIG. The spring pressure accumulating surface 24 slides within a range of about 30 degrees to release the power of the wiper motor that is to be transmitted to the pivot 2 and the second driven arm 21. Moreover, when the load due to external force etc. on the pivot 2 and the second driven arm 21 is released, that is, in the case of a wiper device, since the wiper arm is given a reciprocating swinging motion, the reciprocating motion applied to the first driven part is When the direction of linear movement is reversed, the stopper 14 slides on the spring pressure accumulation surface 24 and engages the groove 23 again, and thereafter the power of the wiper motor is transferred to the pivot 2.
and is transmitted to the second driven arm 21.

When the pivot arm 1 having such a configuration is used as the first pivot arm 1 of the power transmission mechanism in the tandem wiper device shown in FIG.
The first link connecting rod 111 pivotally connected between the pivot arm and the first driven arm 11 converts it into a reciprocating motion, causing the first pivot 2 to reciprocate via the torque transmission clutch 5, and the second driven arm The side arm 21 is reciprocated. That is, the second
When the driven arm 21 swings back and forth, the second pivot shaft 113 swings back and forth by the second link connecting rod 112 pivotally connected between the second driven arm 21 and the second pivot arm 105. When each of the pivots 2, 113 reciprocates in this way, each wiper arm 12 fixed to the tip thereof
0 and 121 swing back and forth to wipe away raindrops, dust, etc. adhering to the glass surface.

At this time, when the wiper arm 120 and/or the wiper arm 121 becomes locked due to a load caused by an external force (for example, snow, etc.), the plate 25 of the second driven part 4 also becomes locked, as shown in FIG. Groove 2 of the plate 25
The power transmitted from the wiper motor to the first driven part 3 is stronger than the pressing force of the compression spring 13 that biases the stopper 14, and the stopper 14 is pushed upward along the detachment inclined surface 23a of the groove 23. It separates from the groove 23, releases the engagement between the first driven part 3 and the second driven part 4, and cuts off the transmission of power from the first driven part 3 to the second driven part 4. At this time, the first driven part 3 is rotating around the pivot 2, which is locked under the load, in accordance with the power transmitted from the wiper motor, and the first driven part 3 has passed the reversal position. When reversed, the wiper arm 120 and/or wiper arm 121 is released from the locked state, and the stopper 14, which had been sliding on the spring pressure accumulation surface 24, slides in the opposite direction from the reversed position and engages again with the groove 23 of the plate 25. wiper arm 1
20 and wiper arm 121 can be driven in opposite directions.

At this time, the spring pressure accumulation surface 24 is not concentric with the pivot 2, but is formed in a curved shape that approaches the pivot 2 as it moves away from the groove 23.
When the stopper 14 is located on the right side of the spring pressure accumulation surface 24 in FIG. Returns smoothly and engages.

This allows the first pivot arm 1 to be connected to the wiper arm 120 and/or the wiper arm 1.
21 becomes locked by an external force, the torque transmission clutch 5 can release the power of the wiper motor transmitted from the first driven part 3 to the second driven part 4, and lock the wiper arm 120 and/or the wiper arm 121. When the load causing the condition is removed, the power of the wiper motor is transferred to the first driven part 3.
to the second driven part 4, and each wiper arm 1
20, 121 can be driven.

Therefore, in the tandem wiper device described above, even if the wiper arm 120 and/or the wiper arm 121 are in the locked state, the wiper device does not stop at that point, and safe driving visibility can be ensured. .

In this embodiment, the pivot arm 1 according to the present invention is used in a tandem wiper device, but the plate 25 shown in FIG.
By providing the spring pressure accumulating surface 24 on the left side of the groove 23, it can also be used in a one-arm type wiper device that wipes the glass surface with one wiper arm, especially in a wiper device that uses the pivot arm 1. However, the present invention is not limited to tandem wiper devices.

Further, in this embodiment, the first pivot arm 1 has been described as the pivot arm 1 according to the present invention, but the first pivot arm 1 alone can sufficiently cope with the locking of the wiper arm 120 and/or the wiper arm 121. 120 and/or wiper arm 1
In order to accommodate the 21 locks, the second pivot arm 105 also has a pivot arm 1 according to the present invention.
It is also good to use.

[Effects of the invention] As explained above, according to the invention, in the pivot arm that converts reciprocating linear motion into reciprocating rotational movement of the pivot, the first driven portion that transmits the reciprocating linear movement is rotated to the pivot. A second driven part is fixed to the pivot so that it can be freely attached and makes the pivot reciprocate, and one of the first driven part and the second driven part has a second driven part attached to the first driven part. A compression spring constituting a torque transmission clutch that transmits and interrupts the transmitted reciprocating linear motion to the second driven part, and a stopper to which the compression spring applies a force for moving the pivot in the radial direction are provided, and the other The driven part is provided with a plate that also constitutes a torque transmission clutch and has a spring pressure accumulating surface that is non-concentric with the pivot and is formed continuously with a groove that the stopper engages with and an inclined surface of the groove for removing the stopper. When the wiper arm becomes locked due to an external force, the power of the wiper motor transmitted to the pivot can be cut off, thereby preventing damage to the pivot arm and the pivot, and when the wiper arm is released from the locked state. Since the power of the wiper motor can be quickly transmitted to the pivot, an excellent effect can be obtained in that visibility can always be secured.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view showing the structure of a pivot arm according to an embodiment of the present invention, Fig. 2 is an explanatory front view showing the cover of Fig. 1 removed, and Fig. 3 is an explanatory exploded perspective view of the pivot arm. , FIG. 4 is an explanatory diagram showing the external appearance of a conventional pivot arm, and FIG. 5 is an explanatory diagram showing a power transmission mechanism in a tandem type wiper device. 1...Pivot arm, 2...Pivot, 3...
...First driven part, 4... Second driven part, 5... Torque transmission clutch, (13... Compression spring, 14
... Stopper, 23 ... Groove, 23a ... Removal inclined surface, 24 ... Spring pressure accumulation surface, 25 ... Plate. ) (torque transmission clutch).

Claims (1)

[Scope of utility model registration request] In a pivot arm that converts reciprocating linear motion into reciprocating rotational motion of a pivot, a first driven portion that transmits the reciprocating linear motion is rotatably attached to the pivot, and a second driven portion that causes the pivot to reciprocate rotational movement. is fixed to the pivot,
One of the first driven part and the second driven part has a compression clutch that constitutes a torque transmission clutch that transmits and interrupts the reciprocating linear motion transmitted to the first driven part to and from the second driven part. A stopper is provided with a force for moving the pivot in the radial direction by a spring and the compression spring, and the other driven part is provided with a groove in which the stopper engages and a stopper disengaging slope of the groove. A pivot arm comprising a plate also forming a torque transmission clutch and having a spring pressure accumulating surface non-concentric with the pivot formed by the pivot arm.