KR100767444B1 - Wiper arm assembly - Google Patents

Abstract

A wiper arm assembly is provided to prevent a blade from moving in a width direction of the blade while the blade washes a glass of a vehicle due to the interaction between a protrusion and a support wall surface. A center hole is formed in the center portion of a blade(40). A support axis(42) is positioned in the center hole in a direction perpendicular to the longitudinal direction of the blade(40). A coupling hole(37) is provided in a retainer and the support axis(42) is rotatably received. A vibration blocking unit prevents the blade(40) from moving in a width direction of the blade(40) due to the abrasion between the glass of a vehicle and the blade(40) while the blade(40) moves backward and forward with the retainer. The vibration blocking unit includes a support wall surface and a guide part.

Description

Wiper arm assembly

1 is a view showing a state in which a general wiper arm assembly is installed.

FIG. 2 is a diagram schematically showing a blade flowing while the wiper arm assembly shown in FIG. 1 operates. FIG.

3 is a schematic cross-sectional view of a wiper arm assembly according to a preferred embodiment of the present invention.

4 is an enlarged view of the portion “A” shown in FIG. 3.

FIG. 5 is a view of the portion shown in FIG. 4 as viewed from the "Z" direction, with the rubber portion of the blade removed.

FIG. 6 is a cross-sectional view taken along the line VI-VI shown in FIG. 3.

FIG. 7 is a perspective view of the guide part extracted from the wiper arm assembly shown in FIG. 3.

8 is a view showing a state in which the projection jaw is supported on the support wall in the wiper arm assembly shown in FIG.

FIG. 9 is a view illustrating a state in which a protrusion jaw is caught by a locking jaw in the wiper arm assembly illustrated in FIG. 3.

FIG. 10 is a schematic view of detaching the blades from the wiper arm assembly shown in FIG. 3. FIG.

<Description of the symbols for the main parts of the drawings>

10 ... wiper arm assembly 20 ... arm head

30 Retainer 32 Guide part

34.Elastic part 35.Protrusion jaw

37.Combination hole 38 ...

39 ... opening 40 ... blade

41.Center hole 42.Support shaft

44. Supporting wall 46

50 ... tensile spring 421

423 straight line

W ... width direction

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear wiper arm assembly of a vehicle, wherein the blade is in a widthwise direction with respect to the retainer by frictional force between the blade and the glass of the vehicle while the blade is reciprocating to remove foreign matter from the glass of the vehicle. A wiper arm assembly with improved structure to prevent flow.

In general, a rear wiper may need to be installed on a rear glass of a vehicle depending on the inclination angle of the glass. In most cases, the rear glass of a notch back-style passenger vehicle called a sedan is not provided with a rear wiper, but in the rear glass of a hatch-back vehicle such as a sports utility vehicle (SUV) Rear wipers are essential. This is because, depending on the style of the vehicle, a negative pressure is generated in the rear glass while the vehicle is driving, and dust and the like are easily accumulated in the rear glass.

The general configuration of such a rear wiper is shown in FIG. In general, since the rear wiper is an assembly consisting of a plurality of parts, the rear wiper will be referred to as a wiper arm assembly.

Referring to FIG. 1, the wiper arm assembly 1 is largely composed of three components. That is, the arm head 2, the retainer 3, and the blade 4 are the same. The arm head 2 is fixed to a pivot shaft installed on the vehicle body side and rotates with the pivot shaft by the rotation of the pivot shaft. The retainer 3 is coupled to one end of the arm head 2 and serves to transmit the rotational force of the arm head to the blade 4. The blade 4 is in contact with the glass of the vehicle and slides to remove and remove foreign substances on the glass of the vehicle.

The wiper arm assembly 1 of this structure generally has a tension spring in the connection structure of the retainer 3 and the arm head 2 to force the blade 4 to pressurize the glass of the vehicle. , Not shown). One end of the tension spring is hung on the retainer 3 and the other end is hung on the arm head 2.

In the wiper arm assembly having such a structure, the blade and the retainer 3 are detachably coupled to each other. This is to simply separate and replace or repair only the blade 4 without having to disassemble the wiper arm assembly 1 to replace or repair the blade 4 which is a consumable.

However, the blade 4 is relatively rotated with respect to the retainer 3 due to the frictional force with the glass during the reciprocating rotational motion while contacting the glass of the vehicle to remove foreign matter on the glass of the vehicle. That is, there is a problem of flowing in the width direction W of the blade 4 shown in FIG. When the above-mentioned flow occurs while the wiper arm assembly 1 is mounted on the vehicle, there is a problem of increasing noise and a bad effect on the emotional quality felt by the driver. In addition, durability of the wiper arm assembly 1 There is a problem to drop.

On the other hand, the blade (4) is detachably coupled to the retainer (3), the blade (4) is coupled to be rotatable in a certain angle range with the support shaft as the rotation axis for the separation. However, when the blade 4 is excessively rotated with respect to the retainer 3 by an unintentional external force, there is a problem that the blade 4 or the glass of the vehicle may be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a wiper arm assembly having an improved structure such that durability of the wiper arm assembly is improved and noise generation is suppressed while mounted in a vehicle.

Another object of the present invention is to provide a wiper arm assembly whose structure is improved so that the blade does not rotate excessively with respect to the retainer by an unintended external force.

In order to achieve the above object, a wiper arm assembly according to the present invention includes a blade for wiping a glass of a vehicle, a retainer connected to the blade and pressing the blade toward the glass of the vehicle, and connected to the retainer from a vehicle body side. A wiper arm assembly comprising an arm head for receiving a rotational force to reciprocally rotate the retainer and the blade.

A central hole formed in the center of the blade;

A support shaft disposed vertically with respect to the longitudinal direction of the blade in the central hole;

A coupling hole provided in the retainer to rotatably receive the support shaft; And

Vibration suppression means for inhibiting the blade from flowing in the width direction of the blade with respect to the retainer by frictional force with the glass of the vehicle while the blade reciprocates with the retainer;

The vibration suppression means,

A pair of support wall surfaces extending from the wall surface of the central hole of the blade and arranged to face each other; And

And a guide portion integrally formed with the retainer and protruding toward the blade.

A portion of the guide portion is maintained in contact with the support wall surfaces while the blade rotates with respect to the retainer.

In order to achieve the above object, the wiper arm assembly according to the present invention includes a blade for wiping the glass of the vehicle, a retainer connected to the blade to press the blade toward the glass of the vehicle, and connected to the retainer to the vehicle body side. In the wiper arm assembly comprising a arm head for receiving a rotational force from the reciprocating rotational movement of the retainer and the blade,

A central hole formed in the center of the blade;

A support shaft disposed vertically with respect to the longitudinal direction of the blade in the central hole;

A coupling hole provided in the retainer to rotatably receive the support shaft; And

Rotation limiting means for limiting the rotation of the blade while the blade is rotated relative to the retainer relative to the retainer with the support shaft as the rotation axis by an external force,

The rotation limit means,

A pair of support wall surfaces extending from the wall surface of the central hole of the blade and arranged to face each other;

A pair of locking jaws formed to protrude from the pair of support wall surfaces in the longitudinal direction of the support shaft to face each other;

An elastic part formed integrally with the retainer and protruding toward the blade; And

And a pair of protruding jaws protruding from the elastic part in opposite directions from each other.

The guide part is an elastic part that is rectangular in cross section perpendicular to the protruding direction and is elastically deformable; And a pair of protruding jaws protruding from the elastic part in opposite directions to each other.

The blade includes a pair of locking projections formed to protrude in the longitudinal direction of the support shaft to face each other on the pair of support wall,

The protruding jaws are not arranged in a straight line with each other, and the blades are caught by the locking jaws while the blades rotate relative to the retainer with the support shaft as the rotation axis, thereby limiting the rotation of the blades. It is preferable to be able to pass through the locking step.

The support shaft has an arcuate section that is perpendicular to its longitudinal direction and a pair of straight portions arranged so as to be parallel to and facing each other with respect to an arbitrary diameter of the circle, and the coupling hole has a distance between the straight portions. It is preferable to include an opening having a width larger and smaller than the diameter of the circle.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a schematic cross-sectional view of a wiper arm assembly according to a preferred embodiment of the present invention, FIG. 4 is an enlarged view of the portion “A” shown in FIG. 3, and FIG. 5 is the “Z” direction of the portion shown in FIG. 4. 6 is a cross-sectional view taken along line VI-VI shown in FIG. 3, and FIG. 7 is a perspective view showing the guide part extracted from the wiper arm assembly shown in FIG. 3. 8 is a view showing a state in which the projection jaw is supported on the support wall in the wiper arm assembly shown in FIG.

3 to 8, the wiper arm assembly 10 of the present embodiment includes an arm head 20, a retainer 30, and a blade 40.

The arm head 20 has one end fixed to, for example, a cap nut 12, on a pivot shaft 11 fixed to a vehicle. The pivot shaft 11 is connected to a link structure (not shown) connected to the motor side to rotate with the driving force of the motor. As the pivot shaft 11 rotates, the arm head 20 rotates at a predetermined angle with respect to a portion fixed to the pivot shaft 11.

One end of the retainer 30 is coupled to allow relative rotation with respect to the arm head 20. The other end of the retainer 30 is coupled with a blade 40 for wiping the glass of the vehicle. The retainer 30 receives the driving force of the driving motor connected to the pivot shaft through the arm head 20 to perform a reciprocating rotational motion with the blade 40 as the pivot shaft. It serves to convey. The retainer 30 is also connected to the arm head 20 by a tension spring 50 for pressing the blade 40 toward the glass of the vehicle. That is, one end of the tension spring 50 is hung on the retainer 30 and the other end is hung on the arm head 20.

The retainer 30 includes a coupling hole 37 and a guide portion 32 for connection with the blade 40 which will be described in more detail below.

The coupling hole 37 is provided at the other end of the retainer 30, that is, the portion connected to the blade 40. The coupling hole 37 has a receiving portion 38 and an opening portion 39. The receiving portion 38 is a portion for receiving the support shaft 42 of the blade 40 to be described later. The opening portion 39 is a portion connecting the receiving portion 38 and the outside, the width of which is smaller than the diameter of the receiving portion 38.

The guide part 32 includes an elastic part 34 and a protruding jaw 35. The elastic portion 34 is formed to protrude in the direction intersecting the longitudinal direction of the retainer 30 in the body of the retainer 30. The elastic portion 34 has a rectangular cross section perpendicular to the protruding direction. The protruding jaw 35 is provided with a pair. The pair of protruding jaws 35 protrude in opposite directions from the elastic part 34. The pair of protruding jaws 35 are arranged so as not to lie in a straight line with each other. The protruding direction of the elastic portion 34 and the protruding direction of the pair of protruding jaws 35 are substantially perpendicular. The elastic part 34 is capable of twisting and deforming in the protruding direction of the elastic part 34.

The blade 40 is rotatably coupled to the retainer 30. The blade 40 is provided with a central hole 41 at the center thereof. In the center hole 41, a support shaft 42 disposed perpendicular to the longitudinal direction of the blade 40 is disposed. The support shaft 42 is connected to both sidewalls of the central hole 41. A cross section perpendicular to the longitudinal direction of the support shaft 42 is formed with an arc portion 421 which is a part of a circle and a pair of straight portions 423 arranged parallel to and facing each other with respect to an arbitrary diameter of the circle. . The arc portion 421 is formed to be substantially the same as or slightly smaller than the inner diameter of the receiving portion 38, but larger than the distance between both sidewalls of the opening portion 39, the arc portion 421 is the opening portion 39 Do not pass. However, the distance between the straight portions 423 is smaller than the distance between both side walls of the opening 39 so that the straight portion 423 corresponds to both side walls of the opening 39. ) May be separated from the coupling hole 37 through both sidewalls of the opening 39. For this reason, the support shaft 42 may be separated from the coupling hole 37 provided in the retainer 30 while rotating while sliding about the inner circumferential surface of the coupling hole 37. As described above, the position at which the support shaft 42 cannot be separated from the coupling hole 37 is called a first position, and the position at which the support shaft 42 can be separated from the coupling hole 37 is defined as a second position. It is called location.

A portion of the center hole 41 extends to form a pair of support wall surfaces 44. The support wall surfaces 44 are spaced apart to face each other. The support wall surfaces 44 are configured to maintain contact with the pair of protruding jaws 35. The pair of support wall surfaces 44 and the pair of protruding jaws 35 provided on the retainer 30 interact with each other so that the blade 40 moves reciprocally with the retainer 30. Vibration suppression means for suppressing the blade 40 from flowing in the width direction of the blade 40 with respect to the retainer 30 by the frictional force with the glass of the vehicle is formed.

A locking jaw 46 is formed at an upper portion of each of the support wall surfaces 44. The locking jaw 46 protrudes from the support wall surface 44 in the longitudinal direction of the support shaft 42. As a result, a pair of catching jaws 46 are arranged to face each other.

Detailed description of the operation of the wiper arm assembly 10 according to the present invention having such a configuration is as follows.

First, the operation of the vibration suppressing means which is one object of the present invention will be described.

With the wiper arm assembly 10 mounted to the vehicle, the wiper blade 40 is in a state of being pressed against the glass of the vehicle by the retainer 30 and the tension spring 50. In this state, when the vehicle is raining while driving or wants to remove foreign matter on the glass of the vehicle, the wiper operation switch disposed in the driver's seat is operated. Then, electricity is applied to the wiper drive motor disposed on the vehicle body side, and the pivot shaft rotates when the motor rotates. Accordingly, the rotational force of the motor is transmitted to the arm head 20 fixed to the pivot shaft, and the rotational force rotates the blade 40 through the retainer 30. The blade 40 has a frictional force in contact with the glass of the vehicle and cleans the glass of the vehicle. In this process, the blade 40 is subjected to a torsional force in a state in which it is coupled to the support shaft 42 and the coupling hole 37. Therefore, the blade 40 is instantaneously centered around the support shaft 42. Attempts to flow in the width direction as shown in FIG. However, as shown in FIGS. 6 and 8, the torsional force of the blade 40 is maintained in the support wall surface 44 because the protrusion jaw 35 and the support wall surface 44 are kept in contact with each other. And the blade 40 is transmitted to the retainer 30 through the protruding jaw 35, and thus the torsional force is received together with the blade 40 and the retainer 30. There is an effect that the flow in the width direction (W) is prevented.

On the other hand, the operation of the rotation limiting means which is another object of the present invention will be described.

In some cases, the blade 40 rotates with respect to the retainer 30 by the support shaft 42 as the rotation axis due to an unintended external force. Of course, in order to replace or repair the blade 40, it is necessary to separate the blade 40 from the retainer 30, but when such a request is not necessary, for example, when a vehicle is put into an automatic car washing machine or the like, the rotary brush of the automatic car washing machine, etc. When the blade 40 is caught, the blade 40 may rotate relative to the retainer 30 in an unintended situation. In this process, if the blade 40 rotates excessively using the support shaft 42 as the rotation axis, the blade 40 may be damaged. However, as shown in FIGS. 6 and 8, the protruding jaw 35 and the support wall surface 44 are in contact with each other while the blade 40 rotates with the support shaft 42 as the rotation shaft as in the present embodiment. When the sliding is made while maintaining the contact and reaches a certain degree of rotation, the protruding jaw 35 is caught by the locking jaw 46 as shown in FIG. 9. Therefore, excessive rotation of the blade 40 is prevented, and when the external force is removed, the blade 40 is in contact with the glass of the vehicle by the elastic restoring force of the tension spring 50 applied by the retainer 30 again. Will return to. As a result, the blade 40 is rotated to be spaced apart from the glass of the vehicle by an unexpected external force, thereby preventing the problem of being damaged.

In addition, when the blade 40 is to be separated from the retainer 30 in order to replace or repair the blade 40, the support shaft 42 must be rotated to be in the second position mentioned above. By the way, the second position can be reached only when the protrusion caught on the locking jaw 46 passes between the locking jaws 46. Therefore, the process of releasing the locking portion of the protrusion caught on the locking jaw 46 is as follows.

The locking jaw 46 is provided with a pair, the interval between the locking jaw 46 is wider than the thickness of the elastic portion 34 provided in the retainer 30, the pair of projection jaw (35) It is narrower than the distance between both ends of. However, since the pair of protruding jaws 35 do not lie in a straight line, any one of the pair of protruding jaws 35 shown in FIG. 7 first passes between the catching jaws 46 and then The operator exerts an external force so that another projection jaw 35 passes between the locking jaws 46. In this case, since the elastic portion 34 is capable of torsional deformation, the protruding jaw 35 may pass through the locking jaw 46 in turn as described above. When the support shaft 42 reaches the second position through the above process, as shown in FIG. 10, the straight portions 423 of the support shaft 42 are parallel to both sidewalls of the opening 39. Since the support shaft 42 is separated from the coupling hole 37, the blade 40 and the retainer 30 may be separated from each other.

As described above, the wiper arm assembly 10 is illustrated in FIG. 2 while the blade 40 cleans the glass of the vehicle by the interaction of the protruding jaw 35 and the support wall surface 44. There is an effect that the flow is prevented from occurring in the width direction (W).

Meanwhile, the locking jaw 46 and the protrusion jaw 35 interact with each other to prevent the wiper blade 40 from being damaged from being separated from the glass of the vehicle by an unintentional external force.

In addition, the blade 40 is formed by the interaction between the arc portion 421 and the straight portion 423 provided on the support shaft 42 and the receiving portion 38 and the opening portion 39 provided on the retainer 30. There is an effect that the blade 40 can be easily separated from the retainer 30 for the replacement or maintenance of the.

In the present embodiment, the guide portion 32 includes an elastic portion 34 which is rectangular in cross section perpendicular to its protruding direction and is elastically deformable; And a pair of protruding jaws 35 protruding from the elastic portion 34 in opposite directions from each other, but the configuration of the guide portion 32 is also different from that of the protruding jaws 35. Can be achieved.

In the present embodiment, the support shaft 42 is a pair of cross sections perpendicular to the longitudinal direction of the circular arc portion 421 which is a part of the circle and arranged in parallel with and facing each other with respect to any diameter of the circle. Although described as having a straight portion 423, the shape of the cross section perpendicular to the longitudinal direction of the support shaft 42 may be configured in various shapes having a thickness difference.

The present invention has been described above with reference to preferred embodiments, but the present invention is not limited to the above examples, and various forms of embodiments may be embodied without departing from the technical spirit of the present invention.

As described above, in the wiper arm assembly according to the present invention, there is an effect that the flow is prevented from occurring in the width direction while the blade cleans the glass of the vehicle by the interaction of the protrusion and the support wall. .

On the other hand, the engaging jaw and the projection jaw has an effect that the wiper blade is prevented from being damaged from being separated from the glass of the vehicle by an unintentional external force.

Further, as in the preferred embodiment of the present invention, the blade is easily removed from the retainer for the replacement or repair of the blade by the interaction of the arc portion and the straight portion provided in the support shaft and the receiving portion and the open portion provided in the retainer. The effect is separable.

Claims (6)

A blade for wiping the glass of the vehicle, a retainer connected to the blade to press the blade toward the glass of the vehicle, and an arm connected to the retainer to receive a rotational force from the vehicle body side to reciprocally rotate the retainer and the blade. A wiper arm assembly comprising a head, A central hole formed in the center of the blade; A support shaft disposed vertically with respect to the longitudinal direction of the blade in the central hole; A coupling hole provided in the retainer to rotatably receive the support shaft; And Vibration suppression means for inhibiting the blade from flowing in the width direction of the blade with respect to the retainer by frictional force with the glass of the vehicle while the blade reciprocates with the retainer; The vibration suppression means, A pair of support wall surfaces extending from the wall surface of the central hole of the blade and arranged to face each other; And And a guide portion integrally formed with the retainer and protruding toward the blade. And a portion of the guide portion remains in contact with the support wall surfaces while the blade rotates with respect to the retainer. The method of claim 1, The guide part is an elastic part that is rectangular in cross section perpendicular to the protruding direction and is elastically deformable; And And a pair of protrusion jaws protruding from the elastic portion in opposite directions from each other. The method of claim 2, The blade includes a pair of locking projections formed to protrude in the longitudinal direction of the support shaft to face each other on the pair of support wall, The protruding jaws are not arranged in a straight line with each other, and the blades are caught by the locking jaws while the blades rotate relative to the retainer with the support shaft as the rotation axis, thereby limiting the rotation of the blades. The wiper arm assembly, characterized in that passing through the locking jaw. The method of claim 1, The support shaft has an arcuate section which is perpendicular to its longitudinal direction, and a pair of straight sections arranged so as to be parallel to and facing each other with respect to any diameter of the circle, And the coupling hole includes an opening having a width greater than the distance between the straight portions and smaller than the diameter of the circle. A blade for wiping the glass of the vehicle, a retainer connected to the blade to press the blade toward the glass of the vehicle, and an arm connected to the retainer to receive the rotational force from the vehicle body side to reciprocally rotate the retainer and the blade. A wiper arm assembly comprising a head, A central hole formed in the center of the blade; A support shaft disposed vertically with respect to the longitudinal direction of the blade in the central hole; A coupling hole provided in the retainer to rotatably receive the support shaft; And Rotation limiting means for limiting the rotation of the blade while the blade is rotated relative to the retainer relative to the retainer with the support shaft as the rotation axis by an external force, The rotation limit means, A pair of support wall surfaces extending from the wall surface of the central hole of the blade and arranged to face each other; A pair of locking jaws formed to protrude from the pair of support wall surfaces in the longitudinal direction of the support shaft to face each other; An elastic part formed integrally with the retainer and protruding toward the blade; And And a pair of protruding jaws protruding from the elastic part in opposite directions from each other. The method of claim 5, The protruding jaws are not arranged in a straight line with each other, and the wiper arm assembly can pass through the locking jaws by the elastic torsional deformation of the elastic portion.

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