JPH06156197A - Wiper device used for automobile window glass - Google Patents

Abstract

(57) [Abstract] [Purpose] In a wiper device, a stroke transmission device with no play and less noise is realized, and knock at the swing reversal position is removed. Arrangement: at least two tooth rows 62, 6 with one of the two teeth 42; 52 arranged adjacent to each other
4 of the two teeth, one of which is made of a relatively non-deformable material and the other of which is elastically displaceable, the other of which 64 The teeth 66 of the said teeth, viewed in the direction of the rocking axis, at least in a plane intersecting the rocking axis, approximately the maximum permissible play 66 between the two teeth.
Is larger than the teeth of the one tooth row 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a windshield wiper device for use in a window glass of a motor vehicle, which is provided with a wiper arm which is swingably driven and has a plurality of portions in the longitudinal direction. The end supports the wiper blade, and the swing motion of the outer wiper arm portion supporting the wiper blade is derived from the swing motion of the wiper arm via the stroke transmission device, the stroke motion being superimposed on the swing motion. The stroke transmission has a toothed segment concentrically arranged with respect to the rocking axis and fixed to the frame, the tooth of the toothed segment being the tooth of the pinion. It is in mesh with the pinion,
A type in which one end of the thrust rod is pivotally connected off center and the other end of the thrust rod is pivotally attached to the outer wiper arm portion.

[0002]

2. Description of the Prior Art In a wiper device of this type known from U.S. Pat. No. 3,831,220, the toothed segment and the pinion are formed in one piece, so that very little effort is required. Inevitable tooth play leads to undesired noise, especially in the swing reversal position. The use of plastic for the toothed segment and the pinion does improve the noise generation slightly, but it completely eliminates the knock in the rocking reversal position caused by the play of the tooth. Do not mean.

[0003]

SUMMARY OF THE INVENTION The object of the invention is therefore to improve a wiper device of the type mentioned at the outset to eliminate the abovementioned drawbacks and to provide a play-free, low-noise stroke transmission. It is to provide such a wiper device.

[0004]

In order to solve this problem, in the arrangement according to the invention one of the two teeth has at least two rows of teeth arranged adjacent to one another. Of these two tooth rows, one tooth row is made of a relatively non-deformable material, the other tooth row is elastically displaceable, and the tooth of the other tooth row is in the swing axis direction. In view of the above, at least in a plane intersecting with the swing axis, the tooth is formed larger than the teeth of the one row of teeth by an amount of almost maximum allowable play between the both teeth. .

[0005]

According to the present invention, when the stroke transmission is idling or slightly loaded, the motion transmission between the toothed segment and the pinion is transmitted through the elastically displaceable tooth row. The other dentition of non-deformable material, i.e., the noisy dentition, does not work together.

Only when the load is increased, the elastically displaceable tooth row is gradually deformed, and in time, the tooth row made of the non-deformable material is gently transferred to the other tooth row as the deformation of the other tooth row is increased. When they come into contact with each other, the tooth rows made of the non-deformable material together transmit the moment. However, in this case, no noise occurs.

[0007] By means of the second and subsequent aspects, other advantageous configurations of the wiper device according to the first aspect are possible. An advantageous configuration according to the invention is obtained if both tooth rows on the pinion are designed as ring gears.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

A wiper device 12 is assigned to the windshield 10 shown in FIG. This wiper device has a drive device (not shown in detail), and this drive device drives the wiper arm 16 in a swinging manner. in this case,
This wiper arm, together with the wiper blade 18 fixed to its free end, is rotated about the swing axis 22 belonging to the stroke transmission device 20 in the double arrow 24 direction shown in FIG.
Swing between two reversal positions. One inversion position is shown in FIG.
Is indicated by a solid line, while the other inverted position is indicated by a broken line and is indicated by reference numeral 18 '. During the swing motion, the stroke motion that occurs in the radial direction with respect to the swing axis 22 is transmitted to the wiper blade 18 placed on the windshield 10 to be wiped. This stroke movement is indicated in FIG. 2 by the double arrow, which has the reference 26. In this way, the wiping field 28 rubbed by the wiper blade 18 has a different shape than the circular segment. A wiper device operating in this way is used by a single windowpane wiper where it is desired to scrape the largest possible wiping field on the windowpane to be wiped. In particular, it is desirable that the window glass corner area that is largely separated from the swing axis is also rubbed. However,
Irrespective of this, the use of such a wiper device is also conceivable if the vehicle glazing is associated with a plurality of, in particular two, wiper devices arranged next to one another. In this case, the transmissions of these two wiper devices are designed in such a way that the respective wiper blades belonging to both wiper devices rub the considered optimum wiping field.

FIG. 2 shows the wiper device 12 of FIG. 1 in principle. In FIG. 2, the wiper arm 16
Are located in the working position 23, which is indicated by a broken line in FIG. The travel transmission 20 is shown in more detail in FIG. 2, and here the rocking axis 22 is shown to be formed by a rocking shaft mounted and mounted on a frame. Since this rocking shaft is rocked in a known manner via a thrust crank transmission (not shown), the wiper arm 16 and thus the wiper blade 18 rigidly connected to the rocking shaft can be seen in FIG. It swings in the direction of the double arrow 24 between the two inversion positions shown. The stroke transmission device 20 is
It is formed as follows. That is, the stroke transmission has a toothed segment 50, which is concentric with the pivot axis and is fixed to the frame, the teeth 52 of this toothed segment being in this embodiment directed towards the pivot axis. There is. The wiper arm 16 itself is formed of two parts.
The wiper arm has a base body 29 which is non-rotatably connected to the swing shaft of the wiper, which base body has a first lever formed as a slide guide 30. In the second wiper arm portion 3
2 is slidably guided in the longitudinal direction. The second wiper arm portion 32 extends from the slide guide 30 and the outer free end of the second wiper arm portion carries the wiper blade 18. Slide guide 3
The inner end 34 of the second wiper arm part, which is guided by 0, has a joint point 36, at which one end of a thrust rod 38 is pivotally mounted. Furthermore, the wiper arm base 29 has a projecting rocking lever 40 which extends substantially diametrically with respect to a radially oriented slide guide 30. This swing lever 40 has a pinion 42
Is rotatably supported. The pinion 42 is rigidly connected to one end of a crank 44, and the other free end of the crank is pivotally connected to the other end of the thrust rod 38 opposite the joint point 36. There is. The joint between the thrust rod 38 and the crank 44 is designated by the reference numeral 46 in FIG. The stroke transmission device 20 is arranged so that the teeth of the pinion 42 and the teeth 52 of the toothed segment 50 fixed to the frame mesh with each other. That is, when the window glass wiper having the wiper arm 16 and the wiper blade 18 is oscillated in the direction of the double arrow 24 by the drive device (not shown), the pinion 42 that serves as the crank moves to the crank 4
4 and the thrust rod 38 moves to the wiper arm 16
The reciprocating motion (double arrow 26) is transmitted to the outer wiper arm portion 32. In this case, the pinion 42, the crank 44, and the thrust rod 3 provided in the stroke transmission device.
8 and the inner end 34 of the wiper arm portion are adjusted as follows. That is, the wiper blade 18 is adjusted so as to reach the outermost stroke position of the wiper blade 18 when it is directed to the corner range of the windshield 10. Correspondingly, the wiper blade is located in the working position in which the outer wiper arm portion 32 is retracted at least into the slide guide 30 in the central position and the two-sided position.

In particular, as shown in FIG. 4, the pinion 42 is divided laterally with respect to its axis of rotation. In this case, one partial pinion 54 is made of a relatively non-deformable material, for example polyamide, whereas the other partial pinion 56 is made of an elastically displaceable material, for example polyurethane. 3 and 4
As shown in, the toothed segment 50 has internal teeth 52 in this embodiment. Both these pinion 5
4, 56 are rigidly connected to one another in this embodiment by rivets 58 arranged parallel to the axis. However, these rivets themselves were only used to illustrate the non-rotatable connection. The means by which the two partial pinions are connected to each other is selected according to the purpose. As clearly shown in FIGS. 3 and 4, the contours of the two partial pinions 54, 56 are not identical when viewed in the direction of the axis of rotation of the crankshaft 60, which is formed as a pinion shaft. Obviously, a partial pinion 5 made of a relatively non-deformable material
4 is slightly smaller than the other partial pinion 56 made of elastically displaceable material. Furthermore, as can be seen quite clearly from FIG. 3, the teeth 62, 64 of the two partial pinions are
Are located one behind the other when viewed in the direction of the axis of rotation.
This means that the contour of the partial pinion 56 made of elastically displaceable material projects along the entire outer contour, slightly beyond the outer contour of the partial pinion 54 made of a relatively undeformable material. I mean. As is apparent from FIG. 3, only the teeth of the elastically displaceable partial pinion 56 of the pinion 42 mesh with the teeth 52 of the toothed segment 50 during the slight load stage of the stroke transmission. This allows
Extremely quiet and shock-free operation of the stroke transmission is achieved. However, as the load on the stroke transmission increases, the tooth flanks of the partial pinion 56 gradually deform, and eventually the tooth flanks of the partial pinion 54 made of a relatively undeformable material abut the teeth 52 of the toothed segment. , Together with the transmission of the moment. This gradual deformation of the tooth flanks of the partial pinion 56 takes place without noise.
In FIG. 3, a slightly larger partial pinion 56 has a projecting portion 66 that extends beyond the contour of the partial pinion 54.
Indicated by. This protruding portion 66 is selected so that there is no tooth play that would normally be unavoidable. That is, since the stroke transmission device 20 always operates without the play of the teeth, even in the swing reversal position, the knock that could not be reduced in the related art can be surely avoided without much effort.

According to another embodiment of the present invention, as shown in FIG. 5, the pinion 142 is also divided laterally with respect to its axis of rotation. In this case, the one partial pinion 154 is made of a relatively non-deformable material.
However, the other partial pinion has a boss 144 of elastically displaceable material, which is surrounded by a ring gear 146 of a relatively non-deformable material. The ring gear 146 is non-rotatably connected to the boss 144. Also in this embodiment, the partial pinion 156 has a partial pinion 154 in its outer contour.
Slightly larger than. That is, when the wiper device is in operation, if the load is light, the same adjustment is performed so that only the partial pinion 156 works. When the load is increased, the teeth of the partial pinion 156 arranged on the ring gear 146 are gradually displaced in the load direction via the elastic boss 144, and eventually the partial pinion 1
The 54 teeth together transmit the moment. In this embodiment, the two partial pinions 154 and 156 are used for the crankshaft 1
Each of the knurled portions 155 of 60 is itself press-fitted in a non-rotatable manner.

In the embodiment of the pinion shown in FIG. 6, the pinion 242 is divided into three parts in the lateral direction with respect to its rotation axis. The pinion has an intermediate partial pinion 244, which is made of an elastically displaceable material. Partial pinion 24 in the middle
Reference numeral 4 is press-fitted to the crankshaft 260 between the two plate-shaped partial pinions 254 and 255. The outer contours of the teeth of these partial pinions 244, 254, 255 are originally the same. However, after being press-fitted to the crankshaft 260, the intermediate partial pinion 244 receives a constant pressing force in the axial direction of the crankshaft 260, so that the teeth 264 of the intermediate partial pinion 244 bulge in a predetermined manner. When compressed or otherwise compressed, this causes the pinion 242 at the tooth 52 of the toothed segment 50 to produce the play-free, noiseless rolling as previously described. That is,
The teeth 264 of the partial pinion 244 are viewed in the swing axis direction, and the teeth 52, 2 are arranged in a plane intersecting the swing axis.
It is deformed so that it is formed larger than the teeth of both outer part pinions 254, 255 by the maximum allowable play between 42. In this embodiment, such an axial pressing force is applied to both the outer partial pinions 25.
4, 255 are suitably press-fitted onto the crankshaft 260 and then secured.

In a further embodiment shown in FIG. 7, the pinion 342 has an annular groove 344 in the central region when viewed in the direction of its axis of rotation, which annular groove is greater than the tooth height of the pinion. Is also deeply formed. A ring made of an elastically displaceable material is fitted in the annular groove 344. The ring has outer teeth 364 that correspond extensively to the teeth of the pinion 342. However, again, as shown in FIG. 7, the tooth profile provided on the ring 346 is designed such that the outer profile of the toothed ring 346 projects slightly beyond the profile of the pinion 342. All pinions 42,142,242,3
It is obvious that the crankshaft 42 is mounted on the crankshafts 60, 160, 260 and 360 so as not to rotate relative to it, and the crankshaft itself is rotatably supported by the swing lever 40. .

Common to all the embodiments is that the teeth of the individual pinions have at least two teeth arranged adjacent to each other, one of which is one. The row is made of a relatively non-deformable material, the other tooth row being arranged elastically displaceable, the teeth of the other tooth row being viewed in the direction of the rocking axis, between the two teeth. That is, it is formed to be larger than the teeth of one of the teeth by approximately the maximum allowable play.

However, the pinion 4 of the stroke transmission device
An embodiment in which the two are integrally formed and the toothed segment 50 has two rows of teeth located one behind the other in the direction of the swing axis 22 is readily conceivable. The construction of these two dentitions constructed in accordance with the idea of the invention produces similar results to what is possible with the variously designed pinions described above.

[Brief description of drawings]

FIG. 1 is a plan view showing a wiper device attached to a windshield of an automobile.

FIG. 2 is a diagram showing in principle the wiper device shown in FIG. 1 in a state in which the wiper device is located at a position different from the swing reversal position shown in FIG.

FIG. 3 is an enlarged view partially showing a pinion belonging to the stroke transmission device and a toothed segment corresponding to the pinion.

FIG. 4 is a cross-sectional view showing the arrangement shown in FIG. 3 slightly reduced along line IV-IV.

5 is a vertical cross-sectional view of an embodiment of a pinion different from the arrangement type shown in FIG.

FIG. 6 is a cross-sectional view of another embodiment of the pinion.

FIG. 7 is a cross-sectional view of yet another embodiment of a pinion.

[Explanation of symbols]

10 windshield, 12 wiper device, 16
Wiper arm, 18 wiper blade, 18 'inverted position, 20 stroke transmission, 22 swing axis, 2
3 work position, 24 double arrow, 26 double arrow,
28 Wiping field, 29 Base, 30
Slide guide, 32 Wiper arm part, 34
Inner end, 36 joints, 38 thrust rod, 40 rocking lever, 42 pinion, 4
4 cranks, 50 toothed segments, 52
Teeth, 54,56 partial pinions, 58 rivets,
60 crankshaft, 62, 64 teeth, 66 protrusion, 142 pinion, 144 boss, 146 ring gear, 154 partial pinion, 155 knurled part, 156 partial pinion, 160 crankshaft, 242 pinion, 244, 254, 25
5 partial pinion, 260 crankshaft, 264
Tooth, 342 pinion, 344 annular groove, 346
Ring, 360 crankshaft, 364 outer teeth

Claims (11)

[Claims] 1. A wiper device for use in a window glass of a motor vehicle, comprising a swingably driven wiper arm consisting of a plurality of parts in a longitudinal direction, the free end of the wiper arm supporting a wiper blade. And, from the swinging motion of the wiper arm, through the stroke transmission device, of the outer wiper arm portion that supports the wiper blade,
A stroke motion superimposed on the swing motion is derived, and the stroke transmission has a toothed segment which is concentrically arranged with respect to the swing axis and fixed to the frame. A tooth of the toothed segment meshes with a tooth of a pinion, one end of a thrust rod being pivotally connected to the pinion off-center, and the other end of the thrust rod being an outer side. Of one of said two teeth (42; 52) has at least two tooth rows (62, 64) arranged adjacent to each other. One of the two tooth rows is made of a relatively non-deformable material, and the other tooth row is elastically displaceable, and the other tooth row (64) is When the teeth are viewed in the direction of the swing axis, at least the swing axis In a plane intersecting with the tooth of one of the tooth rows (62) by approximately the maximum allowable play (66) between the two teeth. Wiper device used for window glass of automobile. 2. The pinion (142, 242, 34)
2. The wiper device according to claim 1, wherein the tooth row provided in 2) is formed as a ring gear. 3. The pinion (42) is divided transversely to the axis of rotation of the pinion, one part pinion (54) made of a relatively non-deformable material and the other part. The pinion (56) is made of an elastically displaceable material, the two part pinions are rigidly connected to each other, and the teeth of the two part pinions with teeth, or the tooth spaces, are arranged one behind the other in the direction of the axis of rotation. The wiper device according to claim 2, wherein the wiper device is located at. 4. The wiper device according to claim 3, wherein the end faces of the two partial pinions (54, 56) facing each other are pressed against each other and riveted. 5. The pinion (142) is divided transversely to the axis of rotation of the pinion, one partial pinion (154) made of a relatively non-deformable material and the other partial pinion. (156) has a boss (144) made of an elastically displaceable material, the boss having a ring gear (14) made of a relatively non-deformable material.
The wiper device according to claim 2, which is rigidly connected to 6). 6. The pinion (242) is divided in three laterally with respect to the axis of rotation of the pinion, the outer part pinions (254, 255) being made of a relatively non-deformable material. 3. The wiper device according to claim 2, wherein the intermediate partial pinions (244) are made of elastically displaceable material, the outer partial pinions being fixed by compressing the intermediate partial pinions. 7. The pinion (342) has an annular groove (344) in the central region of the pinion when viewed in the direction of the axis of rotation of the pinion, the annular groove of the tooth of the pinion. It is formed deeper than the height, and the annular groove (34
4) In ring (346) made of elastically displaceable material
3. The wiper device according to claim 2, wherein a tooth (364) of said ring projects slightly beyond the contour of the tooth of said pinion. 8. The pinion has shafts (60, 160, 26).
0, 360) non-rotatably connected to the wiper device according to any one of claims 2 to 7. 9. The wiper device according to claim 1, wherein the toothed segment (50) comprises internal teeth (52). 10. The wiper device according to claim 1, wherein the relatively non-deformable material is polyamide. 11. The wiper device according to claim 1, wherein the elastically displaceable material is polyurethane.