JP4690552B2 - Wiper blades for automobile windshields - Google Patents

Description

[0001]
Background Art The wiper blade (DE-PS 15 05 397), which has been widely used in windshield wiper devices for automobile windshields, has a large structural height. In the flow situation that exists in the front, especially at high traveling speeds, the wiper blade is encouraged to lift. At least this greatly reduces the indicated abutment pressure of the wiper blade in the windshield and impairs the wiper action.
[0002]
The invention starts from an extremely low wiper blade according to the superordinate concept of claim 1. In this type of known wiper blade (DE 10 72 98 65.6 A1), a joint pin with a non-circular cross-section is arranged on each of the longitudinal sides of the connecting part, both joint pins being common The joint axis. The thus formed joint half on the wiper blade side cooperates with the support hole that forms the joint half on the wiper arm side on the wiper arm, and the support hole has an edge through the introduction passage. Open, the passage width being adapted to a smaller pin diameter. In this case, the joint configuration is performed as follows. That is, the joint pin does not reach outward from the support hole during the wiper operation. For example, when replacing a worn wiper blade with a new wiper blade, when removing the wiper blade from the wiper arm, the wiper arm is first swung away from the windshield, thereby bringing the wiper blade into its assembled position. In the assembly position, the joint pin is removed from the introduction passage, and the wiper blade can be removed from the arm. However, in the case of improper handling, the wiper blade is already turned by itself when turning the arm away from the arm, and the blade may unintentionally fall off the wiper arm and fall on the vehicle body and damage the vehicle body.
[0003]
In the wiper blade according to the invention having the features of advantages claim 1 of the invention, cross-section to the wiper arm provided with a circular pin, it is possible to put into the bearing recess of the pin in the direction of the joint axis. This results in a coupling and coupling device in which the wiper arm coupling pin is completely surrounded by the wiper blade bearing recess. Removal of the wiper blade from the wiper arm is carried out by pulling the wiper blade from the wiper arm bearing pin in the direction of the joint axis, in which case the corresponding safety measures must be removed beforehand. The arrangement according to the invention of the coupling half on the wiper blade side and the connecting means can be used particularly advantageously in a wiper device in which the wiper arm and the wiper blade are arranged one after the other in the wiping direction. The wiper blade configuration in the area of the connecting portion is particularly inexpensive, which is important for pricing replacement wiper blades. In addition to bearing recess of its function as and joint halves of a coupling means, when the wiper blade you pass through the assembly or inspection device during its fabrication, also acts as a good positioning assist portion. For a quiet wiper action, the wiper arm connecting part has a side area extending vertically with respect to the two wiper blades and arranged upright with respect to the windshield, one of these side areas each It is of great importance that one side area is configured on one of the longitudinal sides of both connecting parts, in which case the distance between both side areas is also between 16 mm and 25 mm. On one side, a defined guide surface or mating surface is produced, on which the corresponding surface of the wiper arm can be brought into clean contact during wiper operation, which guarantees a good wiper result. A spacing range of 16 mm to 25 mm measured in the wiping direction maximizes the minimization of the tilting motion of the wiper blade about its longitudinal axis when the wiper blade reverses its wiping direction. The tilting movement of the wiper blade can cause some unwanted noise generation when play is large. The width of the wiper blade measured in the wiping direction on the other side must not exceed a certain size for reasons of style.
[0004]
In practice, this problem is solved particularly well if the distance between both side areas is between 20 mm and 23 mm as measured in the wiping direction.
[0005]
In special cases, it has been found to be very advantageous if the distance between both side areas measured in the wiping direction is 22 mm.
[0006]
Particularly for reasons of appearance, it is particularly advantageous if the ratio between the length of the wiper blade and the spacing between both side areas is between 22: 1 and 33: 1 .
[0007]
Further developing the idea of the present invention, the bearing recess as viewed in the longitudinal direction of the wiper blade is arranged near one end of the connecting part, with one supporting recess in the connecting part being provided. The thickness of the connecting part between the end and the other end is slightly less than the thickness of the end part having the bearing recess of the connecting part over at least one length section. The thicker end of the connecting part with the bearing recess ensures the necessary stability in the force transmission range from the wiper arm to the wiper blade.
[0008]
In order to prevent unintentional detachment from the wiper arm even when the wiper blade is swung away from the windshield, the wiper blade is measured in the longitudinal direction of the wiper blade and passed through the horizontal groove in the horizontal hole. The distance to one end of the blade is greater than the distance to the other end of the wiper blade.
[0009]
A connecting part length section having a smaller thickness of the connecting part is formed by a transverse groove in the connecting part, the transverse groove being open towards the side opposite the support element of the connecting part; This length section can be used as a passage for the stopper means of the wiper arm, which is opposite to the wiper arm of the wiper blade when the wiper blade is arranged alongside the wiper arm in the wiping direction. Acting on the side, and therefore the low structural height of the wiper blade is not adversely affected. A connecting part in which one of both side areas surrounds the opening of the bearing recess and the other side area has a thickness that is slightly less than the end area with the supporting recess of the connecting part It has been found to be particularly advantageous if it is arranged in this section. This creates a gap between both mating surfaces as viewed in the longitudinal direction of the wiper blade, which has proven particularly advantageous with respect to the wiper blade guide during wiper operation.
[0010]
If the bearing recess is configured as a bag hole, the fouling of the bearing part subjected to this high load can be significantly reduced.
[0011]
If the previously mentioned wiper blade stop means is adapted to a selected groove width of 8 mm to 10 mm, preferably 9 mm, the wiper blade is further improved in stability during wiper operation and the stop means If it is supported by the groove walls facing each other, the load at the bearing point is reduced.
[0012]
In order that the wind deflecting surface to be arranged on the wiper blade is continued even within the range of the connecting part, at least one of the longitudinal sides of both connecting parts is provided with a sloped part over one section. If both the connecting portion longitudinal sides are provided with such a slope, it is possible to achieve further simplification of the assembly of the wiper blade to the wiper arm.
[0013]
An advantage with regard to the production costs of the wiper blades arises when the connecting part is made of plastic.
[0014]
In this case, it is advantageous if the bearing recess is formed by a hole in the guide bushing seated in the connecting part, in which case an advantageous sliding pair combination with the material for the joint pin is achieved.
[0015]
Other embodiments and configurations of the invention will be apparent from the following description of the examples illustrated in the drawings.
[0016]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The wiper blade 10 shown in FIG. 1 has a band-like elongated, spring-elastic support element 12 (FIG. 3), and its lower surface 14 has an elongated, rubber-elastic wiper strip 16. Is fixed parallel to the vertical axis. On the upper surface 18 opposite to the windshield 24 of the support element, also called a spring rail, a connecting portion 20 on the wiper blade side of the connecting device is arranged in the center section, and the wiper blade 10 is articulated by this connecting device. Removably coupled to the drive wiper arm. For this purpose, the wiper arm is provided with a wiper arm side portion of the connecting device at its free end. The wiper arm and thus also the wiper blade 10 are loaded in the direction of the arrow 22 towards the windshield 24 to be wiped of the vehicle (shown in dashed lines in FIG. 1). Is attached. Since line 26 shows the strongest curvature of the windshield surface, as can be readily seen, the curvature of the unloaded wiper blade 10 abutting the windshield 24 at both ends thereof is the largest. Stronger than windshield curvature (Fig. 1). Under the crimping pressure (arrow 22), the wiper blade 10 abuts the windshield 24 with its wiper lip 28 over its entire length. In this case, stress is generated in the spring-elastic support element 12 made of metal, which causes the wiper strip 16 or wiper lip to contact the windshield over its entire length as well as to distribute the crimping pressure uniformly. Let The wiper blade constructed in this way has a significantly lower structure than the wiper blade of the so-called supporting arcuate frame already described first. The advantage of a wiper blade with a spring rail 12 instead of a support frame can be seen in particular in its insensitivity to lift orientation, which is inevitable in the case of a highly structured support arc frame wiper blade. It is. Since the windshield, which is usually curved in a spherical shape, does not form a section of the sphere surface, the wiper blade 10 must be able to constantly adapt to the position of the windshield surface each time during its wiping movement with respect to the wiper arm 30. I must. Accordingly, the connecting device is simultaneously configured as a joint joint between the wiper blade 10 and the wiper arm 30 (shown in phantom in FIG. 2).
[0017]
During the wiper operation, the wiper arm 30 performs a pendulum motion around the pendulum axis 32 (FIG. 2), whereby the wiper blade 10 is transverse to its longitudinal extension in the direction of the double arrow 34 shown in FIG. With this, the windshield 24 can be moved.
[0018]
Hereinafter, a special configuration of the wiper blade 10 will be described in detail. As shown in the drawing, the connecting portion 20 on the wiper blade side sits in the central section of the band-like elongated support element 12 on the upper band surface 18 which is also opposite the windshield of the support element. On the other hand, a wiper strip 16 is disposed on the lower band surface 14. In the embodiment, the support element 12 is configured as an integral spring band, but the support element can be configured as a plurality of individual elements or partial elements, if necessary. The connecting part 20, which is rigidly connected to the support element 12, is provided with a lateral hole 36, shown in FIG. 4 as a bag hole in the embodiment, near one end region, A joint half on the wiper blade side of the joint is formed, which allows relative movement in a plane upright on the windshield between the wiper arm and the wiper blade. In short, the lateral hole 36 forms a bearing recess for a joint pin 38 (FIG. 4), for example, located on the side of the wiper arm 30 and indicated by a chain line. In addition to its function as a bearing recess for the joint pin, the lateral hole 36 also forms a connecting means on the wiper blade side, through which the wiper blade 10 is connected to the wiper arm 30 in a reliable manner. can do.
[0019]
The connecting part 20 comprises side areas 40 and 42 which extend in the longitudinal direction of the two wiper blades 10 and are arranged upright with respect to the windshield, of which one side area is in each case. It is constituted by one of both connecting portion vertical side surfaces 44. In this case, the distance 46 between the two side areas 40 and 42 measured in the wiping direction (double arrow 34) has a special meaning, which will be explained later. The purpose of the side areas 40 and 42 is that the wiper blade can be supported on the support surface of the wiper arm 30 with its side area 40 in one wiping direction, while the other side area 42 provides this function in reverse of the wiper blade. You can see what to do during the orientation exercise. In order to guarantee as little tilting movement as possible about the longitudinal axis of the wiper blade at the moment of reversal of the wiping direction, the largest possible spacing 46 should be sought. On the other side, the excessively large spacing 46 disturbs the appearance of the wiper blade or the harmony in the front of the vehicle with such a wiper blade. Both these criteria were weighed and found to be advantageous if the spacing 46 between both side ranges was between 16 and 25 mm. Furthermore, the length of the wiper blade and the ratio of the spacing between both side ranges should also be located in the range between values 1:22 and 1:33 as much as possible for reasons of appearance. I found out. For the wide spectrum of wiper blades provided, this results in a spacing 46 between 20 and 23 mm between both side areas 40 and 42. In special cases, a spacing 46 of 22 mm has proven very advantageous.
[0020]
As shown in FIGS. 3 and 4, a bearing hole or bag lateral hole 36, called a bearing recess, is arranged in the coupling part 20 near one end of the coupling part. Within this range (FIG. 6), the connecting portion thickness 48 is measured from the surface of the connecting portion 20 and is greater than in other ranges of the connecting portion. As can be seen in particular in FIG. 3, the connecting portion 20 is significantly lower over the length section 50 than in the area of the bearing recess 36. This length section 50 is formed by the width of the transverse groove 54, which transverse groove opens towards the side of the connecting part opposite to the support element 12. In this embodiment, it is particularly important that one of both side areas 40, 42 is configured as a bearing eye protruding in the direction of the joint axis 52 and surrounds the opening of the lateral hole 36. . The other side area 42 is in the area of the connecting part longitudinal side surface 44 where the transverse groove 54 is open or finished. The other side area 42 is thus also present where the connecting part 20 has a thickness that is slightly less than the end area of the connecting part 20 with the bearing recess 36. The width 50 of the transverse groove 54 measured in the longitudinal direction of the wiper blade is 9 mm in this embodiment. This allows a sufficiently wide free space to pass through the stop hook 56 belonging to the wiper arm, which is connected to the wiper arm 30, which has a leg 58 bent towards the windshield and the connecting part 20 and thus the wiper blade. 10 in the area of the transverse groove 54 and cooperates with the side area 42 with its legs 58 when the wiper blade performs its working movement. The 9 mm width for the transverse groove 54 allows a correspondingly stable configuration of the retaining hook 56, which transverses the wiper blade within the transverse groove 54 and thus adversely affects the structural height of the wiper blade 10. There is no. The connection part 20 shown in FIGS. 3 to 6 is made of plastic, in which case the lateral holes 36 are formed directly in the block-like connection part and bearing eyes are formed in the connection part.
[0021]
In order to optimize the sliding state between the coupling pin 38 on the wiper arm side and the wall of the lateral hole 36 acting as a sliding partner, the guide bush or the central part of the sliding bush 62 in which the lateral hole 36 is seated in the connecting part 120. It is advantageous if it is formed by holes 50. In this case, for the same reason, the guide bush 62 is provided with a ring collar 64 which protrudes from the connecting part longitudinal side surface 144 facing the wiper arm 30 and thereby corresponds to the side area 40 of the embodiment already described instead of the bearing eye. The side surface area 140 to be formed can be formed. This is of course also valid if a separate ring disk is arranged instead of the ring collar. Such an embodiment is shown in FIG.
[0022]
Due to the bearing holes or lateral holes 36 being arranged with a certain distance 59 from the lateral grooves 54 (FIG. 4), a corresponding distance 46 is also created between both side areas 40 and 42 or 140 and 42, thereby providing a wiper. Further improvements in blade guidance are achieved.
[0023]
As can be seen from FIG. 2, the distance 82, measured in the longitudinal direction of the wiper blade 10, through the transverse hole or bearing hole 36 or the transverse groove 54 of the joint axis 52 to one end of the wiper blade 10, It is larger than the distance 84 to the other end of the wiper blade. When the wiper blade 10 is swung in a direction away from the windshield 24 by the center of gravity point shifted to the end of one wiper blade, the wiper blade is centered on the joint axis 52 when the wiper blade 10 is swung. A moment is generated which causes the wiper blade to always stay between the stop means 38, 56 of the wiper arm 30 with the side areas 40, 42 of the connecting part 20 and thereby unintentionally disengage from the wiper arm. Is prevented.
[0024]
Since the operating position of the wiper blade is forcibly determined between the stopper means of the wiper arm, erroneous assembly is reliably avoided. This is because otherwise a visually clearly recognizable operating position between the wiper arm and the wiper blade cannot be achieved.
[0025]
For special applications, the wiper blade 10 can be provided on the upper surface 18 of the support element 12 with a so-called wind deflector strip known per se. In such an application, at least one of the connecting part longitudinal sides 44 or 144 is provided with a bevel 66 on one section, which bevel of the wind deflector strip in this area of the wiper blade. It is advantageous to have a function. If both the connecting portion longitudinal sides are provided with such a slope portion 66, it is possible to further simplify the assembly when the wiper blade 10 is coupled to the wiper arm.
[Brief description of the drawings]
FIG. 1 shows a side view of a wiper blade according to the invention.
FIG. 2 is a plan view of the wiper blade shown in FIG. 1, together with a wiper arm indicated by a chain line.
FIG. 3 shows an enlarged view of an isometric detail of the detail indicated by III in FIG.
FIG. 4 is a plan view of the connecting portion shown in FIG.
FIG. 5 shows a cross section of a connecting portion along the line VV in FIG. 4;
6 shows a cross section of the connecting portion along the line VI-VI in FIG. 4;
7 shows another structure of the structure of the connecting portion shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Wiper blade, 12 Support element, 14 Lower surface, 16 Wiper strip, 18 Upper surface, 20 Connection part, 22 Arrow, 24 Wind shield, 26 Surface to be wiped, 28 Wiper lip, 30 Wiper arm, 32 Pendulum axis, 34 Double arrow, 36 Horizontal hole, 38 Joint pin, 40 Side range, 42 Side range, 44 Connection part vertical side, 46 Spacing, 48 Thickness, 50 Length division, 52 Joint axis, 54 Lateral groove, 56 Stop hook, 58 Leg, 59 Spacing , 60 center hole, 62 guide bush or sliding bush, 64 ring collar, 66 slope, 82 spacing, 84 spacing, 86 arrow, 120 connecting part, 140 side area, 144 connecting part vertical side

Claims (13)

A windshield wiper blade for an automobile, which is provided with a connecting part (20), comprising an elongated, rubber-elastic wiper strip (16) that can abut against the windshield (24). Is arranged in parallel to the longitudinal axis of one band surface (14) of the band-like, spring-elastic support element (12) and the other band surface (18) of the support element has a central section of the support element The connecting portion (20) connected to the wiper blade is seated, and the connecting portion is a member on the wiper blade side of the connecting device for connecting the wiper arm and the wiper blade, and the joint half on the wiper blade side The joint axis (52) of the joint half is oriented transversely to the longitudinal extension of the wiper blade (10), Also be coupling means of the wiper blade halves are formed by a bearing bore (36) in the connecting portion (20), coupling portion (20) extends in the longitudinal direction of the wiper blade, the windshield (24) In the form of two lateral areas (40, 42 or 64) arranged upright with respect to
Each one of the side surfaces is configured as one of two connecting portion vertical side surfaces (44), and one of the two connecting portion vertical side surfaces (44) has a guide surface or mating surface for a corresponding surface of the wiper arm. A wiper blade for a windshield of a motor vehicle, characterized in that the distance (46) between the two side areas is between 16 mm and 25 mm.   Wiper blade according to claim 1, characterized in that the distance (46) between the two side areas (40 and 42) is between 20 mm and 23 mm.   Wiper blade according to claim 1 or 2, characterized in that the distance (46) between the two side areas (40 and 42) is 22 mm.   The ratio of the length of the wiper blade (10) to the distance (46) between the two side areas (40 and 42) is located between 22: 1 and 33: 1 Item 1. A wiper blade according to Item 1. The support hole (36) is disposed near one end of the connecting portion when viewed in the longitudinal direction of the wiper blade (10), and the end and the other provided with one support hole of the connecting portion (20). A lateral groove (54) that engages with a retaining hook (56) of the wiper arm (30) is provided between the end portion of the wiper arm (30) and the thickness of the connecting portion (20) in which the lateral groove (54) is disposed. The wiper blade according to any one of claims 1 to 4, characterized in that the thickness is smaller than the thickness of the end section having the support hole of the connecting portion. When measured in the longitudinal direction of the wiper blade (10), the distance from the support hole (36) to the one end of the wiper blade (10) through the lateral groove (54) is larger than the distance to the other end of the wiper blade. The wiper blade according to claim 1, wherein the wiper blade is also large. Wiper blade according to claim 5 or 6 , characterized in that the transverse groove (54) is open towards the side of the connecting part (20) opposite to the support element (12). Wiper blade according to any one of the preceding claims, characterized in that the bearing hole (36) is configured as a bag hole .   Wiper blade according to claim 7 or 8, characterized in that the width (50) of the transverse groove (54) is between 8 mm and 10 mm.   Wiper blade according to claim 8 or 9, characterized in that the width (50) of the transverse groove (54) is 9 mm.   Wiper blade according to any one of the preceding claims, characterized in that at least one of the two connecting part longitudinal sides (44) is provided with a bevel (66) over one section.   Wiper blade according to any one of the preceding claims, characterized in that the connecting part (20) is made of plastic. 13. Wiper blade according to claim 12, characterized in that the bearing hole is formed by a hole (60) in the guide bush (62) seated in the connecting part.

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