DE19922520A1 - Wiper blade for vehicle windscreen, with joint bolt formed by bolt cast onto box - Google Patents

Abstract

The wiper blade has a main bracket (12) which has a box (16) with two side cheeks (28). There is a joint bolt (42) between these side cheeks, for fixing to a wiper arm. The joint bolt is formed from a bolt cast onto the box. The bolt may have a core cast in one piece with the box and may be plated to reinforce it.

Description

State of the art

The invention is based on a wiper blade according to the Oberbe handle of claim 1.

Known wipers have a wiper arm that in the Usually from a fastener fastened to a drive axle part, connected to it via a knee joint Joint part and from a rigidly attached to the joint part closing wiper rod is built up. Furthermore, the Wipers a wiper blade with a mostly multi-unit Support bracket system that a main bracket with hinged to it Has intermediate brackets with the ends of claw brackets kig are connected. With claws the claw bracket is a Wiper rubber held. The wiper blade is attached to the wiper arm steers by placing a hook-shaped end of the wiper rod between two side cheeks reach into a box of the main bar and comprises a hinge pin. The joint formed in this way leads Wiper blade with the wiper rubber over a motor vehicle window be, the joint part and the bracket system allow it Chen that the wiper rubber is a bulge of the motor vehicle adapts test disc. A required contact pressure of the Wi  shear rubbers on the motor vehicle window pane are covered with at least reached a tension spring that the fastening part and the Ge Steering part together with the wiper rod over the knee joint tense.

The brackets are usually made of sheet metal parts, which are manufactured in a stamping and bending process. To a to achieve an easy and inexpensive bracket system, the tiniest possible sheet is used. The hinge pin is either retrofitted in an additional procedure step in the form of a rivet pin on the already bent one Main bracket attached or in one piece during the bending process molded sheet metal piece connected to the main bracket. One too Additional component can be saved and the hinge pin can advantageous in one process step with the main bracket getting produced. Reach the rivet pins so produced but only with difficulty the required tolerances and show none optimal corrosion behavior.

Advantages of the invention

The wiper blade according to the invention has a main bracket, the has a box with two side walls, between which a hinge pin arranged for attachment to a wiper arm is. It is suggested that the hinge pin start from one the cast-on bolt is formed. The hinge pin can be fast and inexpensive with precise dimensions the box to be attached. Compared to the very economical hinges integrally formed on the main bracket the cast hinge pin has a better dimensional stability roundness. The wiper blade can be free of play or with ge little play on the wiper arm. One by game  caused rattling of the wiper blade on a windbreak wipers are avoided and wiping quality is improved.

Different sizes appear on the main bracket and the hinge pin esse forces on the components according to the invention Solution can be coordinated independently. A Oversizing the main bracket and / or risk of breakage of the hinge pin can be avoided. A head stirrups can be hinged bolts of different strengths be cast on for different applications, at for example, a head for a slower motor vehicle bracket with a weaker hinge pin and for a quick lere motor vehicle a main bracket with a stronger Ge steering bolts are executed. It is with a die for a sheet metal part several different wiper blades for under different motor vehicles can be produced. The number of pieces is the same Components can be increased and costs can be reduced the.

The main bracket is usually made of sheet steel in one Stamping and bending process. Sheet metal is inexpensive and can be used in high, high-speed stamping and bending processes Number of pieces can be manufactured per unit of time. Basically However, it is possible to make the main bracket from other materials to produce, for example from plastic, aluminum, etc.

The hinge pin can be completely without core to the box be cast on. In one embodiment of the invention proposed that the hinge pin integrally with the Box executed executed, cast core. The core can from a bridge with a square flat or with a round one or elliptical hollow cross section, etc., for example, executed in one piece with the box  rolled sheet metal part. It can also be used with both sides cheeks or only connected to a side cheek of the box his.

In addition to the advantages described, you can use a cast over NEN core advantageously thinner cast wall thicknesses than a Ge steering pins can be reached without a core. There is less mold material and the casting material hardens faster, which means a larger number of main stirrups per unit of time can be produced. All the free spaces between the core and the box are filled by the molding material, whereby a particularly secure and firm connection between the Ge steering pin and the box can be reached.

Between the hinge pin and the wiper rod or one with the wiper rod connected component friction occurs where through the hinge pin opposite the rest of the main bracket is particularly susceptible to corrosion. According to the invention The hinge pin can be solved by a suitable choice of Casting material to be protected against corrosion without that the entire main bar is treated or from a be agreed material must be produced.

In manufacturing technology, there is a fundamental distinction between primary forms and coating, the casting being the original form can be subsumed. The main difference between pouring and coating is that when casting a casting shape and no additional shape used for coating becomes. The material will insist on coating directly de components applied. Instead of having an existing core to surround a mold and then to cast with pour, a web made in one piece with the box can at least partially coated for reinforcement. The  Bridge can be round, elliptical or angular on one side cheek or on both side cheeks in one piece with the box be executed. It can have high rigidity, good and firm connection between the box and the hinge pin and high corrosion resistance can be achieved. The jetty can be completely with a uniform layer density or only partially and / or with different sizes Layer thicknesses can be coated. By partial coating and different layer thicknesses can in particular Roundness can be improved, for example with a roll th, partially open sheet metal part. Can be used for coating all coating which appears suitable to the person skilled in the art be used, such as Be layers from the gaseous or vapor state, coating from the liquid, pulpy or pasty state, Coating from the ionized state, coating by Welding, soldering, etc.

To the interface between the box and the hinge to enlarge the bolt and in particular an advantageous one The box shows how to achieve or improve positive locking in at least one side wall in the area of the hinge pin at least one opening and / or recess in the Gußma flowed material and coating material and in the Hinge pin is thereby positively attached.

There is a driving force on the main bracket in the area of the box initiated by the wiper arm in the wiper blade, causing in the great forces work in this area. In one embodiment suggested that the box be from an encapsulated area the main bracket is formed. The less polluted area the main bracket can be easily and inexpensively from one Loads adapted material and an adapted materi  al starch. Main bracket made of sheet steel punched out during manufacture and then who which the side cheeks bent so that the bracket has a U-shape assumes. If the box is reinforced by cast material, the side cheeks of the box can be shorter or less high be carried out. Material can be saved and in particular others can use more unbent main frames on a conveyor belt route can be arranged. At a certain band speed more unbent main bars can be transported and pro Unit of time a larger number of main stirrups are bent the. Furthermore, a main temple basic shape can be different rigid boxes for different applications and types claims are executed, for example for under differently fast motor vehicles, for colder areas, in which often have to move large amounts of snow, etc.

Instead of casting around an area of the main bar and the Executing the box in one piece with the main bracket is done in egg ner embodiment of the invention proposed the box and run the hinge pin as a separate casting, which in the main bracket can be used and for example via a Snap connection is attached to the main bracket. The inlay part can be cast with little design effort. Furthermore, manufactured main bars can easily be retrofitted different hinge pins and / or boxes on below different applications can be adapted.

Like the hinge pin, the box can be cast or encased by a reinforcement at least partially layered area of the main bracket. The Be rich can with a uniform layer thickness, with under different layer thicknesses and / or only partially coated be, for example with individual reinforcing ribs, Ver  strengthening points, etc. Next to the box of the main bar can basically additional areas of the main bar or the wiper blade by casting or coating strengthened, for example, areas where the main office gel is connected to intermediate brackets, etc.

When casting a hinge pin onto one usually one in one piece with the main frame and / or with the Pouring around an area of the main bar, depending on the shape processing of the main bar manufacturing process into a mold or a mold can be guided to the main bracket. As a cast mate rial or as a coating material is preferably zinc used. Zinc hardens quickly and can therefore become one Manufacturing process with a high clock frequency turned on cheap be bound. Furthermore, zinc has a high strength and leads to a high one even with low material thicknesses Reinforcement. In addition, zinc can provide good protection against corrosion, can be achieved especially for steel sheet main bars.

With plastic as casting material or as coating material in addition to reinforcement, they can in particular have good corrosion protection and good storage properties can be achieved, such as for example low friction values etc. Instead of zinc and art Substance are also all suitable to the person skilled in the art seeming materials possible, such as magnesium, Copper, brass, aluminum, tin etc.

Marks are usually stamped into the main bar or printed. In the solutions according to the invention, can Marks inexpensively when casting or coating through visually appealing recesses and / or elevations be attached. The indicator can also be used as To  ker of a cast hinge pin and / or can in be cast in a cast box.

drawing

Further advantages result from the following drawing spelling. In the drawing, embodiments of the Invention shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will also expediently use the features individually consider and put together into meaningful further combinations grasp.

Show it:

Fig. 1 shows a windshield wiper from above,

Fig. 2 shows a wiper blade from the side,

Fig. 3 shows an enlarged detail III in Fig. 1 without the wiper arm,

Fig. 4 shows an enlarged detail IV in Fig. 2,

Fig. 5 is a section along the line VV in Fig. 3,

Fig. 6 shows a variant of Fig. 3,

Fig. 7 shows a variant of Fig. 3 with an overmolded core,

Fig. 8 is a side view of the variant according to Fig. 7,

Fig. 9 shows a section along the line IX-IX in Fig. 7,

Fig. 10 shows a variant of Fig. 9 with an overmolded flat web,

Fig. 11 shows a variant of Fig. 9 with a beschich ended round web,

Fig. 12 shows a variant of FIG. 3 with an overmolded portion of a main strap,

Fig. 13 is a side view of the variant according to FIG. 12,

Fig. 14 shows a variant of FIG. 12 with a beschich depressed area of a main bracket,

With an insert part Fig. 15 is a variant of FIG. 12,

Fig. 16 is a section along the line XVI-XVI in Fig. 15 and

Fig. 17 a box according to Fig. 15 in the assembled state.

Description of the embodiments

Fig. 1 shows a windshield wiper having a wiper arm 54, which is a fastened to a not shown drive shaft mounting part 70, one set connected thereto via a knee joint 72 joint part 74 and of a rigidly to the joint part 74 adjoining the wiper rod 76 is building. Furthermore, the windshield wiper has a wiper blade with a multi-member mounting bracket system 78 which has a main bracket 10 with intermediate brackets 80 articulated thereon, with the ends of which claw brackets 82 are articulated ( FIG. 2). With holding claws 84 of the claw bracket 82 , a wiper rubber 86 is held. The wiper blade is deflected on the wiper arm 54 by a hook-shaped end 88 of the wiper rod 76 between two side cheeks 24 , 26 of a box 14 of the main bracket 10 engages and comprises a hinge pin 42 .

The main bracket 10 is made of sheet steel in a stamping and bending process. The hinge pin 42 is inven tion according to a cast on the box 14 cast zinc bolt ( Fig. 3, 4 and 5). The box 14 has on each side cheek an opening 62 , 64 through which the hinge pin 42 projects to the outside of the side cheeks 24 , 26 and via an anchor plate 90 , 92 is positively connected to these in the longitudinal direction. To cast the hinge pin 42 , the main bracket 10 is surrounded in the region of the box 14 with a mold into which the casting material is then advantageously introduced in a die-casting process. The casting material flows through the openings 62 , 64 , fills them and leads to a positive connection between the Ge steering pin 42 and the box 14th Instead of round openings 62 , 64 , non-round openings are also conceivable, such as polyhedral or elliptical openings, whereby additional positive locking in the circumferential direction between the Ge steering pin and the box can be achieved.

In the anchor plate 90 , a mark 68 is inexpensively introduced during casting through a recess, the outer contour of the anchor plate 90 already forming part of the mark 68 . The anchor plate 90 may be round or in any other shape. It is also possible to run a hinge pin 94 without anchor plates, with the side cheeks 24 , 26 flat-closing ( FIG. 6). The hinge pin 94 has a larger diameter than the openings 62 , 54 and is thereby fi xed in the longitudinal direction.

Fig. 7, 8 and 9 show a box 16 which is made in one piece with a main bracket 12 and between the Seitenwan gene 28 , 30 a hinge pin 44 is cast. The hinged bolt zen 44 has a molded core 56 which is made in one piece with the box 16 , namely with both Seitenwan conditions 28 , 30th The core 56 is formed by a rolled sheet metal part, the cavity of which is filled with casting material and which is surrounded with casting material. The hinge pin 44 has ge exact dimensions and high rigidity. In order to improve the connection of the hinge pin 44 with the side cheeks 28 , 30 , these each have an opening 66 into which the cast material has flowed and in which the hinge pin 44 is positively fastened.

FIG. 10 shows a hinge pin 46 which has an integrally cast core 58 which is embodied with the box 16 and which is formed by a flat web. Rolling of a sheet metal part can be saved when the main bracket 12 is formed. Substantially constant components are basically numbered with the same reference characters in the exemplary embodiments.

In FIG. 11, a hinge pin 48 is formed by a web 60, which is made in one piece with the box 16 and is coated for reinforcement. The web 60 is a rolled steel sheet which is coated with zinc on its circumference. The zinc adapts when coating the contour of the steel sheet and fills ner a joint 96 between two end faces of the sheet part. There is a hinge pin 48 with a closed round contour with high strength and good storage properties.

In order to reinforce the main bracket 10 in the area of the force application of the wiper arm 54 , in the exemplary embodiment in FIGS. 12 and 13 a box 18 is formed by a cast-over area of the main bracket 10 . The box 18 has between its side walls 32 , 34 a cast hinge pin 50 which is cast together with the box 18 in one process step. For casting around, the main bracket 10 is surrounded by a casting mold, not shown, which is filled with zinc in a die casting process. Openings 102 are made in side cheeks 98 , 100 of the main bracket 10 , which openings are filled with casting material and lead to a secure, form-fitting connection between the hardened casting material and the main bracket 10 .

In the exemplary embodiment in FIG. 14, a box 20 is formed from an area of the main bracket 10 that is partially coated for reinforcement. On side cheeks 36 of the main bracket 10 stiffening ribs 104 made of zinc are advantageously brought up in the longitudinal direction of the main bracket 10 by cladding.

In Fig. 15, a box 22 and a hinge pin 52 of egg nem separate, insertable into the main bracket 10 plastic casting is formed. The box 22 has side walls 38 , 40 with a U-profile open at the bottom ( FIG. 16). In order to fasten the box 22 to the main bracket 10 , it is guided from above over side cheeks 106 , 108 of the main bracket 10 . The side cheeks 38 , 40 of the box 22 with locking pins 110 , 112 snap behind the side cheeks 106 , 108 of the main bracket 10 and locking pins 114 , 116 on crossbars 118 , 120 of the main bracket 10 . Fig. 17 shows the box 22 with the hinge pin 52 in the assembled state.

Reference numerals

10th

Main bracket

12th

Main bracket

14

box

16

box

18th

box

20th

box

22

box

24th

Sidewall

26

Sidewall

28

Sidewall

30th

Sidewall

32

Sidewall

34

Sidewall

36

Sidewall

38

Sidewall

40

Sidewall

42

Hinge pin

44

Hinge pin

46

Hinge pin

48

Hinge pin

50

Hinge pin

52

Hinge pin

54

Wiper arm

56

core

58

core

60

web

62

opening

64

opening

66

opening

68

Mark

70

Fastener

72

Knee joint

74

Joint part

76

Wiper rod

78

Support bracket system

80

Intermediate bracket

82

Claw bracket

84

Holding claws

86

Wiper rubber

88

The End

90

Anchor plate

92

Anchor plate

94

Hinge pin

96

Joint

98

Sidewall

100

Sidewall

102

opening

104

Stiffening ribs

106

Sidewall

108

Sidewall

110

Locking pin

112

Locking pin

114

Locking pin

116

Locking pin

118

Crossbar

120

Crossbar

Claims (10)

1. wiper blade with a main bracket ( 10 , 12 ) having a box ( 14 , 16 , 18 , 20 , 22 ) with two side cheeks ( 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 , 40 ) , between which a hinge pin ( 42 , 44 , 46 , 48 , 50 , 52 , 94 ) is arranged for fastening to a wiper arm ( 54 ), characterized in that the hinge pin ( 42 , 44 , 46 , 50 , 52 , 94 ) is formed by a cast onto the box ( 14 , 16 , 18 , 22 ). 2. Wiper blade according to claim 1, characterized in that the hinge pin ( 44 , 46 ) has a molded-in core ( 56 , 58 ) made in one piece with the box ( 16 ). 3. Wiper blade according to the preamble of claim 1, characterized in that the hinge pin ( 48 ) from a one piece with the box ( 16 ) executed, at least partially coated for reinforcement web ( 60 ) is formed. 4. Wiper blade according to one of the preceding claims, characterized in that the box ( 14 , 16 ) in at least one side cheek ( 24 , 26 , 28 , 30 ) in the region of the articulated bolt ( 42 , 44 , 46 , 48 , 94 ) has at least one opening ( 62 , 64 , 66 ) and / or recess, flowed into the casting material or Be coating material and in which the hinge pin ( 42 , 44 , 46 , 48 , 94 ) is positively attached. 5. Wiper blade according to the preamble of claim 1 or according to one of the preceding claims, characterized in that the box ( 18 ) is formed by a molded area of the main bracket ( 10 ). 6. Wiper blade according to 1 or 2, characterized in that the box ( 22 ) and the hinge pin ( 52 ) from a separa th, in the main bracket ( 10 ) insertable casting are formed. 7. Wiper blade according to the preamble of claim 1 or according to one of claims 1 to 4, characterized in that the box ( 20 ) is formed by an at least partially coated region of the main bracket ( 10 ) for reinforcement. 8. Wiper blade according to one of the preceding claims, characterized in that the hinge pin ( 42 , 44 , 46 , 48 , 50 , 94 ) and / or the box ( 14 , 16 , 18 , 20 ) are at least partially made of zinc. 9. Wiper blade according to one of claims 1 to 7, characterized in that the hinge pin ( 52 ) and / or the box ( 22 ) are at least partially made of plastic. 10. Wiper blade according to one of the preceding claims, characterized in that an identifier ( 68 ) is introduced into a coating material or into a casting material.