CN1756682A - Windscreen wiper device - Google Patents

Abstract

The present invention relates to a kind of windscreen wiper device that is used for automobile, this device has at least one Wiper arm (3); Have one and be used to drive Wiper arm (3), driven wiper shaft (4; 4 '); Has the bearing body (2) that is used to support wiper shaft (4), wherein this bearing body (2; 2 ') has a clutch shaft bearing end of body (6), second a bearing body end (7) that is positioned at clutch shaft bearing end of body (6) opposite towards Wiper arm (3); Wherein, bearing body (2; 2 ') and the position that be arranged in bearing body bottom (7) of wiper shaft (4) when installing condition be used for the Separation (14 that anti-sealing enters into bearing body (2) by one; 14 ') separate each other.This windscreen wiper device has long especially service life.

Description

windshield wiper unit

The invention relates to a windscreen wiper device, in particular for motor vehicles.

The known windscreen wiper device has the disadvantage that its wiper bearings for supporting the wiper shaft are often exposed to direct water spray. In this case, the water spray penetrates into the bearing body from above and/or from below. This leads to wear of the bearing body or of the wiper shaft mounted therein, with the result that the bearing play increases and thus causes major quality problems. In order to prevent rainwater from penetrating into the wiper bearing, many measures have been known, such as inserting O-rings in the wiper bearing, inserting water-conducting surfaces in the bearing body, or partially using protective covers made of plastic or rubber. surrounding the bearing body. The disadvantage of these known windshield wiper devices is that the spray water flowing down the bearing body penetrates into the bearing body and the bearing body at the lower end of the bearing body when the windshield wiper device is installed into the bearing gap between the wiper shafts and penetrates upwards into the wiper bearing through capillary action and adhesive forces acting in the bearing housing. A functionally reliable sealing of the wiper bearing cannot be achieved with the measures described.

It is therefore the object of the present invention to provide a windscreen wiper device with a particularly long service life.

This task is achieved by the features specified in claim 1 . The core of the present invention is to provide a windshield wiper device with a bearing body and a wiper shaft, wherein the bearing body and the wiper shaft are located at the end of the lower end of the bearing body in the installed state are separated from each other by a separation gap to prevent rainwater from entering the bearing housing. The separation gap between the bearing body and the wiper shaft forms a water spray barrier which prevents water spray entering the bearing body from below from penetrating upwards into the bearing body due to capillary action and adhesive forces. In the separation gap there is no capillary action, or only very little capillary action, since capillary action decreases with increasing gap width. This makes it possible to dispense with expensive sealing measures for sealing the bearing body against the penetration of spray water from below.

The dependent claims describe further advantageous developments of the invention. Due to the advantageous dimensions of the separation gap described in the dependent claims 5 and 6 - these dimensions vary according to the bearing size and the shaft size - the upward penetration of the water spray in the bearing body is prevented, wherein the required construction space of the bearing body Wiper shafts that are particularly small and/or have a small diameter have sufficient strength.

The present invention will be described in more detail below with the aid of preferred embodiments and with reference to the accompanying drawings. These figures show:

FIG. 1 is a partial view of a windscreen wiper device according to a first exemplary embodiment of the invention, which has a bearing body made of plastic.

FIG. 2 is a partial view of a windscreen wiper device according to another exemplary embodiment of the invention, which has a bearing body made of metal.

A first embodiment of the present invention will be described below with reference to FIG. 1 . The windscreen wiper device comprises a bearing body 2 mounted on a body part of a motor vehicle (not shown) and made of plastic. A driven wiper shaft 4 , which is connected in a rotationally fixed manner to a wiper arm 3 , is rotatably mounted in the bearing body 2 . Only a part of wiper arm 3 is shown in FIG. 1 .

A bearing bore 5 whose cross-section is designed to be circular passes through the one-piece bearing body 2 . The bore extends in the longitudinal direction of the bearing body 2 . The bearing part has two opposite bearing body ends 6 , 7 . When the windshield wiper device is in the installed state, the first bearing body end 6 is located at the upper part and faces the wiper arm 3, and when the windshield wiper device is in the installed state, the second bearing body end 7 is located in the lower part.

An outer circumferential carrier shoulder 8 is formed on the bearing body 2 at a distance from the first bearing body end 6 . The carrier shoulder has a support surface 9 facing the end 6 of the first bearing body. A fastening section 10 of the bearing body 2 extends between the first bearing body end 6 and the support surface 9 . The bearing body 2 passes through the body part 1 . The body part rests on the support surface 9 of the carrier shoulder 8 and surrounds the fastening section 10 of the bearing body 2 . The bearing body 2 is arranged on the body part 1 in a rotationally fixed manner.

An annular sealing gap 11 is arranged in the bearing body 2 at the first bearing body end 6 , which is open upward and is connected to the bearing bore 5 . In the sealing gap 11 is arranged a sealing ring 12 which seals the bearing body 2 at the top. A connecting rod protrusion 13 integrally connected to the bearing body 2 is provided at the region of the second bearing body end 7 and is connected to a connecting rod 23 .

The bearing body 2 has a downwardly open, circumferential annular gap 14 which forms a separating gap. The annular gap 14 extends from the second bearing body end 7 toward the first bearing end 6 and is connected to the bearing bore 5 . Compared with the diameter of the bearing bore 5, the annular gap 14 has an additional gap width W, which is: 1 mm<W<3 mm. Thus, the bearing bore 5 widens in a step-like manner towards the surrounding annular gap 14 . The depth T of the annular gap 14 in the longitudinal direction of the bearing body 2 is between 2 mm and 5 mm. Despite the annular gap 14, the bearing body 2 is extremely compact and sufficiently strong. In order to ensure a functionally reliable mounting of the wiper shaft 4 in the bearing body 2 , the bearing body 2 is extended downwards by the depth T of the annular gap 14 compared to conventional bearing bodies.

A wiper shaft 4 whose cross-section is circular is mounted rotatably in a bearing bore 5 of the bearing body 2 , wherein both ends of the wiper shaft 4 protrude from the bearing body 2 . The upper end section 15 of the wiper shaft 4 , which protrudes beyond the first bearing body end 6 , is connected in a rotationally fixed manner to the wiper arm 3 via a wiper arm fastening 16 . A securing ring 17 covering the sealing ring 12 is arranged between the bearing body 2 and the wiper arm 3 , which abuts above the bearing body 2 and surrounds the wiper shaft 4 . A further sealing ring 18 is arranged above the securing ring 17 . The wiper shaft 4 has a second lower end section which protrudes beyond the second bearing body end 7 . A crank plate 19 is connected in a rotationally fixed manner to the second end section. The crank plate is in turn connected via a hinge 20 to an operating lever 21 . In practice, an elastic corrugated washer arranged adjacent to the crank plate 19 and a flat washer arranged adjacent to the second end section are also arranged between the crank plate 19 and the second bearing body end 7 , These two spacers surround the wiper shaft 4 . Bellows gaskets are used to compensate for an adjusted longitudinal play of the bearing. A particularly flat washer with a thickness of between 0.1 and 0.3 mm is arranged under the second end section, which reduces friction at this end section and avoids wear of the softer material of the bearing body 2 . Crank plate 19 , hinge 20 and operating lever 21 are components of a motor drive unit for driving wiper arm 3 .

A brief description of how the windscreen wiper unit functions is given below. Via the operating lever 21 , the hinge 20 and the crank plate 19 a pivoting movement of the wiper shaft 4 is caused, which in turn causes a pivoting movement of the wiper arm 3 . The upward penetration of the spray water in the bearing body 2 is prevented by the downwardly open annular gap 14, since the separation gap formed by the annular gap 14 has a sufficient gap width W to significantly reduce the capillary action in the region of the annular gap 14 and adhesion. There is no or only very little capillary action in the annular gap 14, so that the annular gap 14 forms an obstacle for the upward penetration of the spray water in the bearing body 2. The annular gap 14 is several times larger than the bearing gap between the wiper shaft 4 and the bearing body 2 .

A further, not shown, embodiment of the invention will be described below. In order to form the separation gap, a wiper shaft is used there instead of the annular recess provided in the bearing body according to the first exemplary embodiment. The shaft section of the shaft which is adjacent to the lower end of the wiper shaft is constricted relative to the main section of the wiper shaft. The constricted shaft section extends at the region of the end of the second bearing body and partially within the interior of the bearing body. In this way, the separating gap is formed between the bearing body and the wiper shaft by reducing the diameter of the wiper shaft at the end region of the second bearing body. The size of the separation gap is comparable to that of the first embodiment.

Another embodiment of the present invention will be described below with reference to FIG. 2 . Identical parts have the same reference numerals as in the first embodiment, in this respect reference is made to their description. Components that differ in structure but have the same function also have the same reference numerals, but with a prime added to them.

A driven wiper shaft 4', which is connected in a rotationally fixed manner to a wiper arm 3, is rotatably mounted in a metallic bearing body 2'. The metal bearing body is arranged on a body part 1'.

The bearing body 2' made of aluminum alloy or zinc alloy has a bearing hole 5 extending through the bearing body 2'. The upper half of the one-piece bearing body 2' in its mounted state has a link projection 13' and an opposite fixing arm 22. The connecting rod protrusion 13' is connected with the connecting rod 23. The fixed arm 22 is fixedly connected to the body part 1' via a decoupling part 24. Two bearing sleeves 25, 26 are used in the bearing part 2', which are used to support the wiper shaft 4'. The upper bearing sleeve 25 is arranged at the location of the first bearing body end 6 and the lower bearing sleeve 26 is arranged at the location of the second bearing body end 7 . Bearing sleeves 25,26 come out from their respective bearing body ends 6,7 and are pressed into the bearing body 2'. The upper bearing sleeve 25 is so deeply pressed into the bearing body 2' that there will be a position for a sealing ring 12 at its top. A sealing ring 12 extends over the wiper shaft 4' in the bearing body 2' and seals the bearing body 2' at the top. The lower bearing sleeve 26 is pressed into the bearing body 2' so deeply that its underside 27 has a distance of about 2 to 5 mm from the end 7 of the lower bearing body.

A downwardly open annular gap 14' extends in the bearing body 2' between the lower bearing body end 7 and the underside 27 of the lower bearing sleeve 26, which annular gap is connected to the bearing bore 5. A separation gap is formed between the bearing body 2' and the wiper shaft 4' via the annular gap 14'. The gap has a gap width W of 1 to 3 mm and a depth T of between 2 and 5 mm in the longitudinal direction of the bearing body 2'.

A separate annular gap already provided in the bearing body can be dispensed with if the annular chamber formed in the bearing body by pressing the lower bearing sleeve has a sufficient width to form the separating gap. This annular chamber has formed said annular gap.

The bearing body 2' is closed on the one hand by the downwardly protruding end of the wiper shaft 4' and on the other hand by a safety washer 28. The latter is supported on the wiper shaft 4' via a safety ring.

On the upper bearing body end 6 a crank plate 19' is arranged. As already explained in connection with FIG. 1 , in practice also an elastic corrugated washer and spacer are arranged between the crank plate 19' and the upper bearing body end 6. The wiper shaft 4' passes through the crank plate 19 and is connected to it in a rotationally fixed manner. The crank plate 19 is connected via a hinge 20 to an operating rod 21 . Crank plate 19', hinge 20 and operating rod 21 form parts of a motor-transmission unit. Furthermore, the wiper shaft 4' is connected to the wiper arm 3 via a wiper arm fastening 16 in a rotationally fixed manner.

For the function and effect of the separation gap 14', please refer to the description of the first embodiment. Between the safety washer 28 and the bearing body 2' there may be water spray entering the bearing body 2', wherein the separation gap 14' prevents the water spray in the bearing body 2' from penetrating upwards.

A further, not shown, embodiment of the invention will be described below. The difference between this embodiment and the previous embodiment is that, instead of the annular gap formed in the bearing body, the wiper shaft has a constricted shaft section at the lower end of the bearing body, so that during the contraction of the wiper shaft There is a separation gap between the segment and the bearing body. The basic design of the wiper shaft and bearing body therefore corresponds to the second exemplary embodiment.

According to a further embodiment of the invention, not shown, both an annular gap and a constricted wiper shaft section are arranged in a bearing body in order to form a separating gap.

When installing a windscreen wiper device according to the invention, it is important not to fill up the separation gap between the wiper shaft and the bearing body, for example with grease.

Claims (10)

1. especially for the windscreen wiper device of automobile, this device

A) have at least one Wiper arm (3),

B) have one and be used to drive Wiper arm (3), driven wiper shaft (4; 4 '),

C) have one and be used to support wiper shaft (4; 4 ') bearing body (2; 2 '), this bearing body (2 wherein; 2 ') have

I) clutch shaft bearing end of body (6) towards Wiper arm (3),

Ii) second bearing body end (7) that is positioned at clutch shaft bearing end of body (6) opposite,

D) wherein, bearing body (2; 2 ') and wiper shaft (4; 4 ') position that is positioned at bearing body bottom (7) when installing condition is used for preventing that by one sealing enters into bearing body (2; 2 ') Separation (14 in; 14 ') separate each other.

2. according to the described windscreen wiper device of claim 1, it is characterized in that bearing body (2; 2 ') have one and be used to support wiper shaft (4; 4 '), its cross-sectional plane is circular bearing hole (5).

3. according to claim 1 or 2 described windscreen wiper device, it is characterized in that bearing body (2; 2 ') has one at the position of the second bearing body end (7) with bearing hole (5) bonded assembly and be used to form the circular clearance (14 of Separation; 14 ').

4. according to each described windscreen wiper device in the claim 1 to 3, it is characterized in that wiper shaft has a contraction section that is used to form Separation at the position of the second bearing body end (7).

5. according to each described windscreen wiper device in the claim 1 to 4, it is characterized in that Separation (14; 14 ') has one along bearing body (2; The degree of depth T of longitudinal direction 2 '), wherein the T value is: 1 millimeter＜T＜5 millimeters.

6. according to each described windscreen wiper device in the claim 1 to 5, it is characterized in that Separation (14; 14 ') have a gap width W, wherein the W value is: 1 millimeter＜W＜3 millimeters.

7. according to each described windscreen wiper device in the claim 1 to 6, it is characterized in that bearing body (2) is made of plastics.

8. according to each described windscreen wiper device in the claim 1 to 6, it is characterized in that bearing body (2 ') is a metallo-.

9. according to each described windscreen wiper device in the claim 1 to 8, it is characterized in that the bearing carrier ring (25,26) of in bearing body (2,2 '), packing into.

10. according to each described windscreen wiper device in the claim 1 to 9, it is characterized in that, in order to form Separation (14; 14 ') prolonged described bearing body (2; 2).

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