KR19990002307U - Drive shaft structure of automobile windshield wiper - Google Patents

Abstract

The present invention relates to the structure of the wiper arm drive shaft (40) which transfers the driving force from the motor (10), which is the power generating part of the windshield wiper, to the wiper blade (30) for wiping the windshield glass. A drive shaft coupler 50 formed integrally with the second link portion 22 pivotally coupled to the first link portion 21 coupled to the cam 11 and provided with a key groove 51 on an inner circumferential surface thereof; A key 42 is inserted into the sphere 50 and is slidably coupled to the key groove 51. The upper portion is coupled to the wire arm 31, and the elastic support hole 44 interposed between the lower surface of the coupling sphere on the lower bottom. ) Is composed of a drive shaft 40 is provided with a braid 30 to move the curved surface of the windshield glass to wipe the glass, the contact force between the glass and the braid caused by the curvature difference of the glass portion made of the curved surface, that is, the wiper arm 31 press the wiper blade (30) As the pressure changes, the drive shaft 40 flows up and down by the elasticity of the elastic body 43 installed on the lower surface of the drive shaft 40 and absorbs the pressure to maintain good contact between the braid portion 30 and the glass at all times. The present invention relates to a drive shaft structure of a windshield wiper that prevents operation failure, friction noise, and damage to a link portion caused by increased friction between the braid and the glass.

Description

Drive shaft structure of automobile windshield wiper

The present invention relates to a drive shaft structure of an automobile windshield wiper, and more particularly, relates to a drive shaft of a wiper arm that transmits driving force from a motor, which is a power generating portion of a windshield wiper, to a wiper blade portion for wiping the windshield glass.

Generally, the type of wiper is divided into vacuum type and electric type according to the operating power. The vacuum type is used as the power by using the vacuum generated from the intake stroke of the engine, but is not used at all.

Electric is a motor that rotates the motor by the power and has the capability to cope with the conditions of rainfall and snowfall. Currently, almost electric is used.

The structure of the electric wiper is composed of a link unit 20 for transmitting power and a wiper blade 30 for wiping the windshield glass.

The wiper braid part 30 supports the rubber with the arm 31 corresponding to the curved surface of the glass, and supports the center of the braid 30 with the tip of the wiper arm 31. The lower end of the wiper arm 31 has a bolt or three It is coupled to the link part by the ratio coupling.

The link portion is a mechanism for interlocking the left and right wiper blades 30, and there is a parallel movable counter type according to the interlocking method.

The motor part is integrated with the motor body and the gear case which slows down the motor rotation. It operates the braid at low speed and high speed by converting the current to the series coil and the decentralized field coil.

Therefore, when the wiper is operated, the motor 10 is driven by the power of the battery, and the link part 20 coupled to the cam 11 provided in the motor reciprocates and is rotatable with the link part 20. The drive shaft 140 coupled to the fixed drive shaft fixture 41 is coupled to the left and right rotational movement so that the wiper arm 31 fixedly coupled to the drive shaft by the reciprocating motion of the link portion 20 rotates left and right. The windshield glass is wiped by the braid 30 fixed to the wiper arm 31.

However, in the related art, the coupling of the drive shaft 140 and the wiper arm 31 axially coupled to the link part is fixed so that the wiper blade 30 coupled to the wiper 31 arm is operated by the operation of the wiper arm 31. When the surface of the windshield glass is moved, the gap between the braid and the glass is changed according to the degree of the curved surface of the glass. If the gap is increased, the surface of the glass is not wiped and there is no gap. Has a problem that the breakage occurs with the friction noise or the friction of the link portion to transfer the power of the motor and the uneven wear of the wiper drive shaft.

Therefore, the technical problem of the present invention is to combine the link unit and the wiper arm, and the wire arm drive shaft for transmitting the operating force of the link unit to the wire arm can absorb the shock so that the brave coupled to the wire arm is formed on the curved surface of the windshield glass. To provide a wiper drive shaft structure of the structure that can be absorbed by the impact caused by the difference between the curved surface, that is, the friction between the brave and the wind glass due to the difference in the curved surface.

1 is a configuration diagram showing the structure of a windshield wiper

2 is a cross-sectional view of a conventional wiper drive shaft

3 is a cross-sectional view of the wiper drive shaft provided with the present invention

* Description of the symbols for the main parts of the drawings *

10: motor 40: drive shaft

11: Cam 41: fixed mouth

20: Link 42: key

21: first link 43: elastic body

22: second link 44: elastic support hole

30: blade 50: drive shaft coupling

31: wiper arm 51: keyway

A windshield wiper consisting of a motor part generating power, a link part transmitting power, and a braid part wiping the windshield glass, wherein the windshield wiper is formed in a second link pivotally coupled to the first link and has a keyway formed therein. Drive shaft coupling provided with,

A key coupled to the key groove is provided, and an upper portion is coupled to the wiper arm, and a lower bottom surface includes a wiper drive shaft having an elastic support hole interposed between the lower surface of the coupler.

Hereinafter, described in detail with reference to the accompanying drawings.

It is coupled to the cam provided in the motor 10 is integrally formed on the second link 22 pivotally coupled to the hinge to the first link 21 reciprocating by receiving the driving force of the motor and the key groove in the longitudinal direction on the inner peripheral surface A drive shaft coupler 50 provided with a 51 and a key 42 slidably coupled to a key groove 51 provided on an inner circumferential surface of the drive shaft coupler 50 are provided on an outer circumferential surface thereof, and an upper portion thereof is a wiper arm 31. And a lower wiper drive shaft having an elastic support hole 44 which is installed between the lower surface of the coupling sphere and the key 42 moves upward and downward on the key groove 51 of the coupling sphere by its elastic force. It consists of 40.

Hereinafter will be described with respect to the operation.

When operating the windshield wiper provided with the subject innovation is the first link portion 21 coupled to the cam provided in the motor 10 is reciprocating and is coupled to be rotated to the first link portion 21 The drive shaft coupler 50, which is integrally formed on the second link portion 22 and rotatably fixed to the panel, also rotates left and right according to the reciprocating motion of the first link portion 21.

Accordingly, the drive shaft 40 including the key 42 inserted into and coupled to the key groove 51 formed on the inner circumferential surface of the drive shaft coupler 50 also rotates left and right, and the wiper arm coupled to the upper portion of the drive shaft 40 ( 31) is also left and right to move the braid 30 coupled to the wiper arm 31 to move the windshield glass on the left and right to clean the glass. During the above operation, the braid moves the curved portion of the windgrass, and the pressure of the wiper arm 31 for pressing the braid is changed by the difference in curvature of the glass.

In other words, where the radius of curvature of the glass is small, the glass is protruding, so that the contact between the braid and the glass occurs strongly, and where the radius of curvature of the glass is large, the contact between the braid and the glass is small or severe.

In this case, the spring 43, which is insulated between the lower surface of the drive shaft 40 and the lower surface of the drive shaft coupler, is compressed or restored, and moves the drive shaft 40 up and down, so that the wire arm 31 coupled with the drive shaft 40 is also provided. The braid 30 coupled to the wire arm 31, which flows up and down, also flows up and down, so that the curvature of the glass is small and the spring 43 is compressed when wiping the protruding part, whereas the radius of curvature of the glass is large. When wiping, the spring 43 is restored so that the friction force between the braid 30 and the windgrass can be properly maintained.

The effect of the design is that the braid moves on the curved surface of the windshield glass, and the shock caused by the frictional force between the braid and the windglass caused by the curvature difference of the glass is canceled and the operation stop due to the increase of the friction force between the glass and the braid. It prevents damage to the link part that transmits damage and power and prevents the glass from being wiped due to lack of friction.

Claims (1)

In the windshield wiper composed of a motor unit 10 for generating power, a link unit 20 for transmitting power, and a braid 30 unit for wiping the windshield glass, A drive shaft coupler 50 formed integrally with the second link portion 22 pivotally coupled to the first link 21 and provided with a key groove 51 on an inner circumferential surface thereof; The upper portion provided with the key 42 coupled to the key groove 51 is coupled to the wire arm 31 and has a lower wiper drive shaft 40 provided with an elastic support hole 44 interposed between the lower and lower surfaces of the coupling sphere. Drive shaft structure of the windshield wiper for automobiles, characterized in that configured.