DE102008007066A1 - Wiper arm for use in windscreen wiper system, has joint part, and wiper arm joint formed on end of wiper arm with fastening part and pivot pin is provided which connects joint part with fastening part to pivot around wiper arm joint axis - Google Patents

Abstract

The wiper arm has a joint part (5) and a wiper arm joint (1) formed on an end of the wiper arm (35) with a fastening part (2). A pivot pin (10) is provided which connects joint part with the fastening part to pivot around a wiper arm joint axis. A spring element acts between the fastening part and the joint part. The spring element is arranged with its function line (WL) offset in function plane opposite to the pivot pin or pivot stud.

Description

The The invention relates to a wiper arm for windshield wipers or windscreen wiper systems according to the preamble of claim 1.

Wiper arms of this type are known ( DE 37 24 777 A1 ). They are formed at one end for attachment of at least one wiper blade and at the other end with a Wischarmgelenk, namely essentially consisting of a fastening part, with which the wiper arm on a driven by the wiper drive drive element, for example, to a wiper shaft is fastened, from a about a Wischarmgelenkachse pivotally connected to the fastening part hinge part and at least one acting between the fastening part and the hinge part spring element. The articulated connection between the fastening part and the joint part and by the spring element ensures that in the normal or operating state of the wiper arm attached to this wiper blade is pressed against the vehicle window with sufficient force and during the wiping operation, ie during the pivoting of the wiper arm to at least one axis can also follow a different contour and / or height of the vehicle window. A special feature of this wiper arms of the generic type persists in that the wiper arm can be folded with the wiper blade of the vehicle window in a service position, wherein the hinge part is pivoted about the Wischarmgelenkachse (WA) relative to the fastening part, and that at least one between the fastening part and the hinge part acting spring element in the service position (Abklappstellung) on the weggeklappten wiper arm exerts a holding torque that holds the wiper arm in the service position and is directed against the Anpressmoment opposite. This is achieved in that the action line of the spring force exerted by the spring element between the fastening part and the joint part when pivoting between the operating state and the service position intersects the at least one wiper arm pivot axis. To achieve this, in known wiper arms of the generic type, the at least one spring element formed by a tension spring is hung on the fastening part via a C-shaped bracket (usually a wire bracket). This bracket is then shaped so that in the service position it engages around the at least one hinge pin or pin forming the wiper-arm articulation axis. The disadvantage here, however, is, inter alia, that the C-bracket represents an additional component and also substantially increases the effective length of the at least one spring element, as well as the overall height of the wiper arm joint as a whole.

Wischarme are also known ( DE 38 42 954 A1 ), in which, in addition to the at least one spring element, which generates the contact force for the wiper blade in the operating state of the wiper arm, a further spring element is provided, which generates a holding torque in this position holding the wiper arm in the service position. The training is made such that the action line of the spring element generating the Anpressmoment coincides in the service position with the Wischarmgelenkachse, so that this is the Anpressmoment generating spring element in the service position ineffective. Due to the additional, the holding torque in the service position generating spring element these known wiper arms are at least structurally complex. Furthermore, the additional spring element also requires additional space. Wischarme are also known ( DE 38 42 954 A1 ), in which the wiper arm is locked in the service position by latching. These additional locking means require a complex construction.

task The invention is a wiper arm of the generic To further develop the type so that it is highly reliable in a simplified and compact design can be realized. To solve this problem is a wiper arm accordingly formed according to claim 1.

Further developments, Advantages and applications of the invention result also from the following description of exemplary embodiments and from the figures. All are described and / or illustrated illustrated features alone or in any combination in principle subject of the invention, independent from their summary in the claims or their dependency. Also, the content of the claims becomes an integral part the description made.

The Invention will be described below with reference to the figures of embodiments explained in more detail. Show it:

1 in a simplified side view and in section the Wischarmgelenk a windshield wiper according to the invention;

2 a section corresponding to the line II of 1 ;

3 a simplified illustration like 1 ;

4 and 5 similar in representations 2 further embodiments of the invention;

6 a section corresponding to the line II-II of 5 ;

7 in individual representations various mounts for the tension springs of the wiper joint of 5 ;

8th in a simplified representation and plan view of a wiper arm together with a wiper blade.

In the 1 and 2 is 1 the Wischarmgelenk an otherwise not shown wiper arm of a windscreen wiper system for vehicles, especially for road vehicles (cars).

The wiper arm joint consists in a conventional manner of a fastening part 2 , which is made as a molded part of metal or a suitable plastic and which for attachment of the wiper arm to a wiper shaft 3 a wiper drive is used and this an opening 4 for the wave 3 having.

The Wischarmgelenk continues to consist of a hinge part 5 which is formed in the illustrated embodiment with a U-shaped cross-section, with two legs 6 and a yoke portion connecting these legs 7 such that the open side of this U-profile at the vehicle or at the wiper shaft 3 mounted wiper arm of the vehicle window or the vehicle body facing. The hinge part 5 is still in his between the thighs 6 formed space with two of the yoke section 7 wall sections reaching into this room 8th provided, which are parallel to each other and spaced apart as well as parallel to the legs 6 and are provided spaced therefrom. The hinge part 5 is for example using a sheet, for. As a metallic sheet, for example made of sheet steel by punching and bending. The two wall sections 8th are then part of an internal U-profile with a wall sections 8th connecting yoke section 9 , With this, the inside profile, for example, using rivets on the inside of the legs 6 and the yoke piece 7 attached formed outer U-profile, in such a way that the yoke section 9 against the inner surface of the yoke section 7 is applied.

Furthermore, there is also the possibility of the joint part 5 with the thighs 6 , the yoke section 7 and the wall sections 8th to provide as a molded part made of metal or a suitable plastic.

The hinge part 5 is about two provided on this joint part and coaxially arranged with each other joint pivot 10 on the fastening part 2 hinged, leaving it over a limited angular range around that of the two hinge pins 10 formed Wischarmgelenkachse WA is pivotable relative to the fastening part. The two pivot pins each extend between a leg 6 and the adjacent wall section 8th and are attached to these elements at both ends. Each pivot pin is in a bearing opening 11 taken at a free end of one piece with the fastening part 2 manufactured and in the U-profile of the joint part 5 reaching in fork arm 12 is provided. The two fork arms 12 are arranged parallel to each other in the illustrated embodiment and spaced from each other, in such a way that the opposite outer surfaces of the fork arms 12 against the mutually facing inner surfaces of the legs 6 and / or against the mutually facing inner surfaces of the fork arms 12 against the opposite outer surfaces of the wall sections 8th for guiding the joint part 5 issue. The thickness of the fork arms 12 Having at their free ends is equal to or approximately equal to the distance that the respective edge portion 8th from the leg adjacent to it 6 having.

The wiper arm joint 1 further comprises a spring element in the form of a coiled tension spring 13 between the fastening part 2 and the hinge part 5 acts and in the presentation of 2 with the greater part of their length centered between the planes of the two wall sections 8th is included. The distance between the mutually facing inner surfaces of the wall sections 8th or the plane oriented perpendicular to the axis WA planes of these surfaces have a distance from each other, which is greater than the outer diameter of the coiled tension spring 13 , The tension spring 13 is with one end on a bolt 14 held or suspended, which is parallel to the axis WA between the two fork arms 12 of the fastening part 2 extends and at both ends to these fork arms 12 is held. The other end of the spring 13 is at a bolt 15 held or suspended, which is parallel to the axis WA between the wall sections 8th extends and is held at both ends of these wall sections. The arrangement is further made such that the tension spring 13 is arranged with its longitudinal axis in a median plane ME, which is oriented perpendicular to the axis WA and to which in the illustrated embodiment, both the fastening part 2 as well as the joint part 5 are formed mirror-symmetrically. In the in the 1 illustrated normal state of the wiper arm joint 1 or the joint part 5 , the joint part 5 In any case, during the wiping operation, ie, when fitting against a vehicle window, fixed to the wiper arm wiper blade, are the axis of the tension spring 13 and thus their line of action WL below the axis WA, ie are based on the axis WA to the bottom of the joint part 5 offset. As a result, the tension spring exercises 13 about the axis WA a Anpressmoment M1, with the be in the specialist knew manner the necessary for the wiper operation contact pressure of the wiper blade is generated against the vehicle window and also the wiper blade can follow the changing course of the surface of the vehicle window during wiping operation by pivoting the wiper arm about the axis WA of the wiper arm.

The 3 shows again the wiper arm joint 1 in a representation of 1 , but instead of the tension spring 13 only their effective line WL is indicated. Furthermore, in this figure with 16 indicated the vehicle window. As shown in this figure, the hinge part 5 from the in the 1 shown normal state about the axis WA in a service position pivotally, in which the line of action WL of the spring 13 on the bottom of the joint part 5 opposite side of the axis WA runs. This is by the tension spring 13 a holding torque M2 about the axis WA on the joint part 5 exerted, which is opposite to the moment M1 and which the hinge part 5 and thus holds the wiper arm provided on this joint part in the service position pivoted away from a vehicle window. When swinging the joint part 5 between the normal or operating state and the service position cuts the line of action WL of the tension spring 13 the axis WA, which in the illustrated embodiment, despite an immediate suspension of the tension spring 13 on the fastening part 2 and at the joint part 5 This is possible because the axis WA is not of a continuous, ie between the thighs 6 extending pivot pin, but of two pivot pins 10 is formed, each of which is a thigh 6 only up to the adjacent wall section 8th enough. The line of action WL is arranged in a plane of action oriented perpendicular to the axis WA, that in the direction of the axis WA with respect to the pivot pins 10 is offset. One and the same tension spring 13 generates the contact torque M1 and the holding torque M2.

The bearing openings 11 are each formed in the illustrated embodiment so that they are the pivot pin 10 only on a peripheral region of about 180 ° or smaller, so that with all its elements, in particular with the pivot pin 10 finished joint part 5 by radial insertion of the pivot pin 10 in the storage openings 11 on the fastening part 2 can be mounted, with the tension spring 13 both in the normal state, as well as in the service position and when pivoting between the normal state and the service position by their between the fastening part 2 and the hinge part 5 acting spring force the pivot pin 10 in the storage openings 11 guaranteed.

On the one hand, the generated in the normal state by the Anpressmoment M1 pivoting movement of the joint part 5 relative to the fastening part 2 to limit to a maximum angle and on the other hand to achieve a defined service position, are on the hinge part 6 two attacks 17 provided, each of which with the free end of a fork arm 12 or with counter-attacks there 18 and 19 interacts, on both sides of the open side of each bearing opening 11 are formed. The pivoting movement of the joint part 6 by the moment M1 is thereby by the interaction of the stop 17 with the counter-attack 18 limited. The service position is due to the interaction of the respective stop 17 defined with the associated counter stop. The attacks 17 are in the illustrated embodiment of the inner surface of the legs 6 formed protruding projections. The attacks 17 but can also be designed so that they are each between a leg 6 and the associated wall section 8th extend. Through the attacks 17 and the counter-attacks 18 and 19 will continue to achieve that for the joint part 5 only pivoting positions relative to the fastening part 2 are possible in which the tension spring 13 with also sufficient spring force between the fastening part 2 and the hinge part 5 acts and thus the pivot pin 10 sufficiently in the respective bearing opening 11 are secured and thus an undesirable release of the joint part 5 from the fastening part 2 is avoided.

The 4 shows as a further embodiment a wiper arm joint 1a which extends from the wiper arm joint 1 essentially differs in that the hinge piece 5a with a hinge pin 20 pivotable about the axis WA on the attachment part 2a is provided. The hinge pin 20 extends between the two wall sections in this embodiment 8th of the joint part 5a and is at these wall sections 8th held at both ends. The fastening part 2a is integral with a boom 21 formed, which is in the space between the wall sections 8th hineinerstreckt and has a width that is equal to or only slightly smaller than the distance of these wall sections, so that the boom 21 on both sides in each case a wall section 8th immediately adjacent and is guided to this wall section. At the free end is the boom 21 with a bearing opening 22 provided in the same way as the bearing openings 11 is open on the side, so that for mounting the joint part 5a on the fastening part 2a the journal 20 radially into the bearing opening 22 can be introduced. Instead of just one mainspring 13 are at the wiper arm joint 1a two tension springs 13 provided, in each case a tension spring 13 that with the greater part of their length between a thigh 6 and the adjacent wall section 8th or between the levels of these elements. Each between the fastening part 2a and the hinge part 5a acting mainspring 13 is for this purpose with one end directly to the parallel to the axis WA oriented and at both ends in the fastening part 2a held bolt 14 and at the other end to a bolt 23 held or suspended, extending between a leg 6 and the adjacent wall section 8th extends.

Both tension springs 13 in turn are arranged so that a pivoting of the joint part 5a relative to the fastening part 2a between the normal or operating state and the service position is possible, wherein the action lines WL of the tension springs 13 to cut the axis WA, and that one and the same springs 13 in the normal state of the wiper arm joint 1a generate the contact torque M1 and in the service position, the holding torque M2.

Also in this embodiment, the fastening part 2a and the hinge part 5a formed mirror-symmetrically to the plane ME.

The 5 shows as a further embodiment a wiper arm joint 1b with the fastening part 2 B and the hinge part 5b , The hinge part 5b is as open to its underside U-profile with the two legs 24 and with the yoke portion connecting these legs 25 trained and by means of a hinge pin 26 articulated or pivotable about the axis WA with the fastening parts 2 B connected. The hinge pin 26 is both hands in the thighs 24 held and in a warehouse opening 27 taken at one in the space between the thighs 24 reaching in and made integrally with the mounting bracket boom 28 is trained. The wiper arm joint 1b further comprises two between the fastening part 2 B and the hinge part 5b acting spring elements in the form of the two tension springs 13 , which are arranged with their longitudinal extent or with their line of action WL again in perpendicular to the axis WA oriented working planes. These working planes are in the direction of the axis WA opposite the hinge pin 26 offset, ie each spaced from one end of this hinge pin in the direction of the axis WA. Like in the 5 Also shown are the action lines WL of the two tension springs 13 or the active planes also laterally from the thighs 24 provided, that is arranged at a distance from the opposite outer surfaces of these legs.

For holding the tension springs 13 on the fastening part 2 B There are in the illustrated embodiment wegstehende, oriented with its axis parallel to the axis WA and provided at the end with a head pin 29 provided at which the one end of each tension spring 13 is held or mounted. For attaching the tension springs 13 on the joint part 5b are there from the material of the thighs 24 by partial cutting and by bending shaped ears or tabs 30 provided over the opposite outer surface of the legs 24 stand out and with openings 31 are provided in the other end of each tension spring 13 is mounted.

Like in the 7 shown in positions a and b, instead of the tabs 30 with the openings 31 also tabs 32 with notches or on the opposite outer surfaces of the legs 24 wegstehende cones 33 provided with thickened head end for suspending the respective Zugfederendes. For covering in particular also the laterally arranged tension springs 13 has the wiper arm joint 1b Furthermore, a hood-like, for example, made of plastic or a metallic material, and the underside of the wiper arm joint 1b open cap 34 on, in a suitable manner on the joint part 5b attached and shaped so that with the cap 34 the fastening part 2 B , the two tension springs 13 as well as the joint part 5b At least partially covered, but still a pivoting of the joint part 5b relative to the fastening part 2 B between the normal state and the service position about the axis WA is possible.

For the final explanation is in the 8th again, the basic structure known to a person skilled in the art there 35 designated wiper arm shown. The wiper arm has at one end the Wischarmgelenk 1 . 1a respectively. 1b on. At the other end is at the wiper arm 35 that in this figure with 36 designated wiper blade attached. On his between the wiper arm joint 1 . 1a respectively. 1b extending Wischarmteillänge is the wiper arm 35 for example, in a U-shaped cross-section, this U-profile then, for example, the continuation of the U-profile of the joint part 5 . 5a respectively. 5b is. In principle, there is also the possibility that this Wischarmteillänge is at least partially formed by a rod-like profile, for example rectangular profile, which then to that of the respective fastening part 2 . 2a respectively. 2 B remote end of the joint part 5 . 5a respectively. 5b is attached.

Above, it was assumed that the wiper arm joints 1a respectively. 1b two spring elements or tension springs 13 exhibit. In principle, only a single spring element or only a single tension spring 13 be provided, and then on one side of the median plane ME.

The The invention has been described above with reference to exemplary embodiments. It is understood that numerous changes as well as modifications possible are.

All versions are common, that the action lines WL of the spring elements lie respectively in working planes that are offset with respect to the one or more pivot pins or bolts, so that when pivoting the joint part 5 . 5a respectively. 5b and thus the wiper arm 35 between the normal state and the service position not only the line of action WL, but also each spring element can intersect the axis WA.

all Executions continue to be particularly common, that the respective spring element both the contact torque M1, as also generates the holding elements M2 in the service position.

1, 1a, 1b

Wischarmgelenk

2, 2a, 2b

attachment portion

3

wiper shaft

4

opening for wiper shaft

5, 5a, 5b

joint part

6

leg

7

yoke

8th

wall section

9

yoke

10

pivot pin

11

bearing opening

12

fork arm

13

mainspring

14 15

bolt

16

vehicle window

17

attack

18 19

counterstop

20

hinge pins

21

boom

22

bearing opening

23

bolt

24

leg

25

yoke

26

hinge pins

27

bearing opening

28

boom

29

spigot

30

flap

31

opening

32

flap

33

spigot

34

cap

35

wiper arm

36

wiper blade

WA

Wiping joint axis

WL

line of action of the spring element

M1

Anpressmoment

M2

holding torque

ME

midplane

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3724777 A1 [0002]
• - DE 3842954 A1 [0003, 0003]

Claims (23)

Wiper arm for use in a windshield wiper system, with one at one end of the wiper arm ( 35 ) trained Wischarmgelenk ( 1 . 1a . 1b ) with a fastening part ( 2 . 2a . 2 B ), with a joint part ( 5 . 5a . 5b ), with at least one joint part ( 5 . 5a . 5b ) with the fastening part ( 2 . 2a . 2 B ) about at least one Wischarmgelenkachse (WA) pivotally connecting pivot pin ( 10 . 20 . 26 ) and at least one between the fastening part ( 2 . 2a . 2 B ) and the joint part ( 5 . 5a . 5b ) acting spring element ( 13 ), which in a normal or operating state of the wiper arm ( 35 ) An Anpressmoment (M1) for pressing at least one with the wiper arm ( 35 ) associated wiper blade ( 36 ) against a vehicle window ( 16 ) and in a service position pivoted wiper arm ( 35 ) generates a holding torque (M2) counter to the contact torque (M1), wherein the line of action (WL) of the at least one spring element (WL) 13 ) when pivoting the wiper arm ( 35 ) between the normal or operating state and the service position, the Wischarmgelenkachse (WA) intersects, characterized in that the respective spring element ( 13 ) with its line of action (WL) in one opposite the at least one hinge pin or pin ( 10 . 20 . 26 ) offset working plane is arranged. Wiper arm according to claim 1, characterized that the respective active plane perpendicular or substantially perpendicular is oriented to the at least one Wischarmgelenkachse (WA). Wiper arm according to claim 1 or 2, characterized in that the at least one spring element is a tension spring ( 13 ). Wiper arm according to one of the preceding claims, characterized in that the at least one spring element ( 13 ) directly on the fastening part ( 2 . 2a . 2 B ) and on the joint part ( 5 . 5a . 5b ) engages or attached to this or attached. Wiper arm according to one of the preceding claims, characterized in that the wiper arm joint ( 1 ) at least two coaxially arranged with each other and axially spaced hinge pins or pins ( 10 ), and that the at least one spring element ( 13 ) with its line of action in a plane of action between the at least two hinge pins or pins ( 10 ) is arranged. Wiper arm according to one of the preceding claims, characterized in that the wiper arm joint ( 1a . 1b ) at least one hinge pin or pin ( 20 . 26 ), and that the at least one spring element ( 13 ) is arranged with its line of action (WL) in a relation to a hinge pin end axially offset working plane. Wiper arm according to one of the preceding claims, characterized in that the hinge pin or pin ( 10 . 20 . 26 ) on the joint part ( 5 . 5a . 5b ) is provided, and that the fastening part ( 2 . 2a . 2 B ) at least one bearing opening ( 11 . 22 . 27 ) for the hinge pin or pin ( 10 . 20 . 26 ) having. Wiper arm according to one of the preceding claims, characterized in that the hinge pin or pin on the fastening part ( 2 . 2a . 2 B ) is provided, and that the joint part ( 5 . 5a . 5b ) has at least one bearing opening for the hinge pin or pin. Wiper arm according to claim 7 or 8, characterized in that the at least one bearing opening ( 11 . 22 . 27 ) for a lateral or radial insertion of the associated hinge pin or spigot ( 10 . 22 . 26 ) is formed, and that the hinge pin or pin in the associated bearing opening ( 11 . 22 . 27 ) by the spring force of the at least one spring element ( 13 ) is secured. Wiper arm according to one of the preceding claims, characterized by stops ( 17 . 18 . 19 ) for limiting the pivoting movement of the joint part ( 5 . 5a . 5b ) relative to the fastening part ( 2 . 2a . 2 B ). Wiper arm according to one of the preceding claims, characterized in that when using at least two on the hinge part ( 5 ) provided hinge pin or pin ( 10 ) These each at both ends at two spaced-apart wall sections ( 6 . 8th ), and that the fastening part ( 2 ) each with a bearing opening ( 11 ) ( 12 ) in the space between the wall sections ( 6 . 8th ). Wiper arm according to claim 11, characterized in that the joint part ( 5 ) at least in one of the hinge pins or pins ( 10 ) having a portion to a lower side of the wiper arm ( 35 ) or the wiper arm joint ( 1 ) open U-profile is formed, and that the one of the two, each hinge pin or pin ( 11 ) holding wall sections a leg ( 6 ) of the U-profile and the other wall portion arranged in the U-profile inner wall portion ( 8th ). Wiper arm according to claim 12, characterized in that the two inner wall sections ( 8th ) for forming a free space for the at least one spring element ( 13 ) are spaced from each other. Wiper arm according to one of the preceding claims, characterized in that the at least one hinge pin or pin ( 20 ) at both ends of the wall ( 8th . 24 ) of the joint part ( 5 . 5b ), and that the at least one spring element ( 13 ) or the active line (WL) of this spring element associated working plane laterally from the at least one hinge pin or pin ( 20 . 26 ) facing away from the wall portion ( 8th . 24 ) is provided. Wiper arm according to claim 14, characterized in that in a design of the joint part ( 5a ) as a U-profile between one leg ( 6 ) and one provided within the U-profile and for fastening the at least one hinge pin or spigot ( 20 ) serving wall section ( 8th ) a free space for the at least one spring element ( 13 ) is formed. Wiper arm according to one of the preceding claims, characterized by a covering cap ( 24 ) for covering at least the at least one spring element ( 13 ). Wiper arm according to one of the preceding claims, characterized by a covering cap ( 24 ) for at least partially covering the fastening part ( 2 B ) and / or the joint part ( 5b ). Wiper arm according to one of the preceding claims, characterized in that for holding the at least one hinge pin or spigot ( 10 . 20 . 26 ) serving wall section ( 8th . 24 ) Are part of a U-profile. Wiper arm according to one of the preceding claims, characterized in that for holding the at least one spring element ( 13 ) on the fastening part ( 2 . 2a . 2 B ) and / or on the joint part ( 5 . 5a . 5b ) Bolt ( 14 . 15 . 23 . 29 ) are provided. Wiper arm according to one of the preceding claims, characterized in that for holding the at least one spring element ( 13 ) on the fastening part ( 2 . 2a . 2 B ) and / or on the joint part ( 5 . 5a . 5b ) formed from the material of this part shaped fasteners, such as tabs ( 30 . 32 ) are provided. Wiper arm according to one of the preceding claims, characterized in that the fastening part ( 2 . 2a ) and / or the joint part ( 5 . 5a . 5b ) are a molded part of a metallic material or of plastic. Wiper arm according to one of the preceding claims, characterized in that the fastening part ( 2 . 2a . 2 B ) and / or the joint part ( 5 . 5a . 5b ) are made of a sheet of metal or plastic. Wiper arm according to one of the preceding claims, characterized in that the wiper arm joint ( 1 . 1a . 1b ) is mirror-symmetrical to a median plane (ME) is formed, namely ggs. with the exception of the arrangement and number of spring elements ( 13 ).