JPH11301421A - Parallel wiping type wiper device - Google Patents

Abstract

(57) [Problem] To provide a parallel wiping type wiper device provided with a rotation-linear motion conversion mechanism by screw means which can be applied to a front windshield using curved glass. SOLUTION: In a parallel wiping type wiper device in which a wiper arm 4 which reciprocates by engaging a base end portion thereof with a guide rail 2 extending in a lateral direction to wipe raindrops on a window glass 1, the wiper arm is provided with a screw shaft. When the screw shaft is rotated by screwing with the nut 5a, it is connected to a nut 5b which moves in the axial direction to apply a lateral movement force, and via expansion / contraction means 9/10 which can be displaced only in a direction perpendicular to the screw shaft. To be connected to the nut. According to this, it is possible to cope with a change in the center-to-center dimension between the guide rail and the screw shaft.
Can be provided with a straight screw axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel wiping type wiper apparatus for reciprocating a wiper arm in a lateral direction to wipe raindrops on a window glass.

[0002]

2. Description of the Related Art A guide block (nut) screw-coupled to a shaft provided with a spiral groove on the outer peripheral surface is axially driven by rotating the shaft to move the wiper arm attached to the guide block together with the guide block. A wiper device that is moved is known from Japanese Utility Model Publication No. Sho 51-10502. A rotary-linear motion conversion mechanism using this kind of screw means has a relatively simple structure and can obtain a smooth and highly rigid linear motion, so that it is suitable for a wiper device of a passenger car having a limited storage space. is there.

[0003]

However, since the front windshield of a passenger car is generally formed of a curved surface, the movement of the wiper arm must be adjusted accordingly. However, in the case of the rotation-linear motion conversion mechanism using the screw shaft having the spiral groove as described above, it is impossible to curve the screw shaft to the curved surface of the front windshield. Therefore, the axis of the guide rail that regulates the movement of the base of the wiper arm and the axis of the screw shaft that imparts the left-right movement to the base of the wiper arm cannot be parallel to each other, so that the ball screw / nut is excellent in accuracy and operation smoothness. The mechanism could not be adopted. Actually, the structure disclosed in the above publication is not configured to wipe the entire area of the front windshield with linear motion.

[0004] The present invention has been devised to solve such problems of the prior art, and its main objects are as follows.
It is an object of the present invention to provide a parallel wiping type wiper device provided with a rotation-linear motion conversion mechanism using screw means which can be applied to a front windshield using curved glass.

[0005]

In order to achieve such an object, the present invention provides a window glass by a wiper arm 4 which reciprocates by engaging its base end with a guide rail 2 extending in the lateral direction. 1. In the parallel wiping type wiper device for wiping raindrops, the wiper arm is screwed onto the screw shaft 5a and the nut 5 moves in the axial direction when the screw shaft rotates.
b to provide a lateral movement force and to be displaceable only in a direction perpendicular to the screw axis (for example, provided on a connection plate integral with a pin 10 provided on a nut and a slider supporting a wiper arm). (Eg, engagement with the elongated hole 9). According to this, it is possible to cope with a change in the center-to-center dimension between the guide rail and the screw shaft, so that the movement along the curved front windshield can be given by the straight screw shaft.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a parallel wiping type wiper device constructed according to the present invention. The wiper device includes a guide rail 2 extending along a lower edge of a front windshield 1 of an automobile, a slider 3 sliding on the guide rail 2, and a wiper arm 4 having a base end coupled to the slider 3. And a ball screw / nut mechanism 5 for reciprocating the wiper arm 4 in the left-right direction. The ball screw 5 is provided by rotating a geared motor 6 provided at the shaft end of the ball screw 5a. The rotational motion of the ball screw 5a is converted into a linear motion of the ball nut 5b screwed to the ball screw 5a on the axis of the ball screw, the slider 3 is moved in the left and right direction together with the ball nut 5b, and the wiper attached to the wiper arm 4 The blade 7 can be provided with a left-right reciprocating wiping motion on one surface of the front windshield. It has become to so that.

A ball nut 5b is provided on the front surface of the slider 3.
A pair of connecting plates 8 sandwiching the upper and lower surfaces of the slider 3 are integrally fixed to the slider 3. The connecting plate 8 is provided with a long hole 9 extending in the front-rear direction, and the pin 1 protruding from both upper and lower surfaces of the ball nut 5b is formed in the long hole 9.
0 is engaged.

Now, since the guide rail 2 is curved along the lower edge of the front windshield 1, the moving trajectory of the slider 3 is naturally curved. In contrast,
The ball screw 5a is linear, and the ball nut 5
The locus of movement of b is also linear. That is, the slider 3
The dimension between the front and rear of the ball nut 5b changes as it moves left and right. Therefore, in the present invention, by connecting the slider 3 and the ball nut 5b with the pin 10 and the elongated hole 9 extending in the front-rear direction, the center-to-center dimension between the slider 3 and the ball nut 5b changes with the left-right movement. Made it acceptable. That is, the elongated hole 9 and the pin 10 constitute an example of the expansion / contraction means described in claim 1.

A connecting mechanism for integrally moving the slider 3 and the ball nut 5b left and right and allowing a change in the center-to-center dimension between the slider 3 and the ball nut 5b.
That is, as the expansion / contraction means, not only the connection between the elongated hole 9 and the pin 10 but also a telescopic mechanism or a pantograph link mechanism may be used.

[0011]

As described above, according to the present invention, it is possible to cope with a change in the center-to-center dimension between the guide rail and the screw shaft. Therefore, the structure is relatively simple, and a smooth and highly rigid linear motion can be obtained. By the rotation-linear motion conversion mechanism using the screw means, the right and left reciprocating motion along the curved front windshield can be given to the wiper arm. Therefore, a great effect can be obtained in expanding the applicability of the parallel wiping type wiper device to the front windshield of the curved glass in a passenger car having generally limited storage space.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a parallel wiping type wiper device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front windshield 2 Guide rail 3 Slider 4 Wiper arm 5 Ball screw / nut mechanism 5a Ball screw 5b Ball nut 6 Geared motor 7 Wiper blade 8 Connection plate 9 Slot 10 Pin

Claims (1)

[Claims] 1. A parallel wiping-type wiper device for wiping raindrops on a window glass with a wiper arm that reciprocates by engaging a base end thereof with a guide rail extending in a lateral direction, wherein the wiper arm has a screw shaft. When the screw shaft is rotated by being screwed into the nut, the nut is connected to the nut which moves in the axial direction when the screw shaft is rotated to apply a lateral movement force, and is connected to the nut via expansion / contraction means which can be displaced only in a direction perpendicular to the screw shaft. A parallel wiping-type wiper device characterized in that the wiper device is used.