DE19548820A1 - Closure piece for a metallic tube - Google Patents

Abstract

Disclosed is a windshield wiper in which the feed line to a wash nozzle (206) runs through the drive shaft (11) of the windshield wiper arm. The feed line consists of a small metal pipe (200) which is passed through the hollow shaft (11). The end of the small pipe (200) is closed by means of a closure piece (205) which supports a nozzle body (206). To seal securely the closure piece (205) of the small pipe (200) the invention provides that it has a central guide pin (209) that is coaxially surrounded by a projection (210) so as to form between the guide pin (209) and the projection (210) an annular groove in which the wall of the small pipe (200) is inserted.

Description

The invention relates to a closure piece for a metallic tube.

This closure piece is intended to carry a nozzle with the wash water can be applied to a vehicle window. The Tube is ge through the drive axis of the wiper arm leads.

The closure piece is now supposed to come out of the stub axle Close the protruding end of the tube so that the what water does not get into the axis bushing.

It is proposed that the closure piece a zen central guide pin, which is coaxial from one approach is surrounded, so that between the guide pin and approach forms an annular groove in which the jacket of the tube is pluggable.

The closure piece has a longitudinal pocket bore, the Opening after the closure piece has been placed in the tube Chen points into this.

A cross shot takes a nozzle body, the Insert the nozzle channel into the blind hole.  

Description of an embodiment

The following is the execution of a motor gear unit described for a wiper system of a motor vehicle. How from the description it becomes clear, the essential elements of this system also for emergency gear units use that serve other purposes.

The description is based on 10 figures that follow of the show:

Fig. 1 shows a motor gear unit without a gear cover, the representation partly in plan view and partly in section.

FIG. 2 shows a section along the line II-II of FIG. 1.

Fig. 3 shows a top view of the gear housing without a cover with a contact disc lying on the bottom of the housing.

FIG. 4 shows a section along the line IV-IV of FIG. 3.

Fig. 5 shows a view from the outside against the bottom of the gear housing, partly in plan view, partly in section, with an inserted electronics unit.

Fig. 6 shows a plan view of the brush support plate of the electric motor.

Fig. 7 shows a section through the housing along the VII-VII of FIG. 1,

Fig. 8 shows a detail on Fig. 2,

Fig. 9a, b show the contact plate, which is inserted into the housing,

Fig. 10 shows an attachment for the con tact plate in the housing,

Fig. 11 shows details of the water passage through the output shaft.

First, reference is made to FIG. 1.

The unit consists of an electric motor 1 and a transmission 2 . The electric motor 1 is laterally attached to the housing 3 Getriebege. The gear is a so-called pendulum gear.

This consists of the following elements. The motor shaft 4 is extended and carries a worm 5 at its extended end. This meshes in a worm wheel 6 . Eccentrically to the axis 7 of the worm wheel 6 , a first lever 8 with a partial pinion 9 with the worm wheel 6 at the pivot point 13 is pivotally connected. The pinion 9 engages in a white teres pinion 9 'on the output shaft 11 . A fulcrum 12 on the first lever 8 is articulated via a second lever 10 to the output shaft 11 such that the fulcrum 12 always moves to a partial radius around the axis of the drive shaft 11 .

If the worm wheel 6 is driven by the motor while maintaining a direction of rotation, the first lever 8 performs a forced movement due to its double articulation in the pivot points 12 , 13 , which leads to the output shaft 11 being moved back and forth. By a corre sponding choice of the geometry of the pinion 9 , 10 and the pivot points 12 , 13 , almost any pivot angle of the output shaft 11 can be set.

As can be seen in particular from FIG. 2, the axis of the pivot point 13 protrudes somewhat beyond the first lever 8 . On this end, a cap 15 is placed, which slides ent on the underside of the cover 17 of the gear housing 3 ent.

To accommodate this transmission, a gear housing 3 is seen before that consists of two parts. The first part consists of a base body 20 made of plastic, which has several recesses. The largest receptacle is used to hold the worm wheel 6 , so that the base body 20 is pot-shaped or trough-shaped in wesentli. The open side of the base body 20 is closed by the already mentioned lid 17 made of metal, which forms the second part of the transmission housing.

The base body 20 now takes in addition to the gear elements further elements that serve to control the engine. These are, in particular, an electronics unit 23 (see FIG. 5) and a contact plate 22 with contact tabs that slide along corresponding switching tracks that are attached to the worm wheel 6 .

So that these elements can be accommodated, further chambers or recesses are provided in the base body 20 , which will be described in more detail below with reference to FIGS. 3, 4 and 5. A first area serves to accommodate the worm wheel 6 and is therefore to be called gear chamber 25 below. It is circular and has a depth that corresponds essentially to the height of the gear. As can be seen in FIG. 3, a contact plate 22 is placed flat on the bottom of the gear chamber. In the center of the chamber there is a pin 26 which forms the axis of the worm wheel 6 . This pin is held in a corresponding recess 28 in the bottom 27 of the gear chamber.

The bottom has further recesses 28 ', 28 '', in which a suppressor 29 or a capacitor 29 ' are introduced, which are arranged on the underside of the contact plate 22 . At the gear chamber 25 is followed by a Ril le 30 , in which the worm 5 on the extended motor shaft 4 is arranged. To carry out the shaft, an opening follows in the axial direction on the groove 30 , which ends in the flange for the electric motor 1 . The groove 30 is open to the gear chamber 25 so that the worm 5 and the worm wheel 6 can come into contact. On another side of the gear chamber 25 , about 90 degrees to the channel 30 , and facing away from the electric motor flange, there is a swivel area 31 , which can be seen clearly in FIG. 1, serves to swivel possibilities for the first and second lever arm 8 , 10 to create.

This area 31 is limited to the outside approximately square, the bottom is flat, its depth is significantly less than that of the gear chamber 25 , so that a step 32 is present between the gear chamber 25 and the swivel area 31 .

To receive a bearing sleeve 40 is in connection with the pivot portion 31 and the gear chamber 25 is a topfförmi ger receiving dome 41 is provided. The edge of the receiving dome 41 begins approximately at the level of the bottom of the swivel area 31 . The bottom 42 of the receiving dome 41 is still clearly below the bottom of the gear chamber 25 . Because the outer contour of the dome 41 partially protrudes into the gear chamber 25 , the wall of the dome is cut away in this area. In the center of the dome is the bearing sleeve 40 , which begins at heights of the bottom of the pivoting region 31 , extends through the bottom 42 of the dome 41 and extends beyond it. Between the inner wall of the dome and the outer wall of the bearing sleeve 40 , stiffening struts 45 extend over the entire height of the dome. In part, the struts are cut away, namely in the area that extends into the Zahnradkam mer 25 .

The areas mentioned: gear chamber 25 , channel 30 , swivel area 31 and the dome 41 are surrounded by an edge 50 , the upper edge of which runs at the same height and serves as a bearing surface 51 for the metal cover 17 and a seal which may be inserted between the edge and cover .

As can be seen in FIGS. 4 and 5, the edge 50 has been guided in part to below the bottom of the individual areas. In Fig. 5 it is seen that the lower edge area 52 53 of the gear chamber 25 encloses the underside of the bottom of about 180 degrees. From this over the underside of the Bo dens extended lower edge region 52 , four ribs 54 extend to a central base 55 , which also protrudes from the underside of the bottom 53 and as can be seen in Fig. 2 serves to receive the pin 26 .

It can be seen that the base 55 ends at approximately the same height as the bottom 42 of the dome 41 . Three stiffening ribs run between the base 55 and the dome 41 : the central rib 56 runs from the center of the base 55 to the axis of the dome 41 , two side ribs 57 each extend tangentially into the base 55 or into the dome 41 .

The arrangement of the ribs was chosen because it is not agile that the pin 26 so the axis of rotation of the worm wheel 6 and the axis of the output shaft 11 remain as precisely aligned as possible to avoid noise during operation of the engine. In order to achieve the necessary rigidity, the base 55 was not directly connected to the bearing sleeve 40 , but with the interposition of the dome 41 with an enlarged diameter compared to the bearing sleeve 40 . Possible windings through the ribs 56 , 57 can thus be better absorbed. The bearing sleeve 40 itself is held firmly in the dome 41 via the stiffening ribs 45 .

The edge 50 in the area of the swivel area 31 is also pulled downward, so that a receiving chamber 60 is formed on the side facing away from the swivel area 31 , which serves to receive control electronics 23 . This can be seen particularly well in FIG. 5, in which a cover 61 , which closes this chamber, is partially cut away, so that a circuit board 62 can be seen, on which electronic switching elements are applied. The receiving chamber 60 is delimited, on the one hand, by the rim drawn downwards, and by one of the ribs 54 and a side rib 57 .

To the side wall of the pivot portion 31 and the receiving chamber 60, which tangentially enters into the wall of the gear chamber 25 is formed a plug housing 70th When the connector housing is a rectangular box 71 , which is open at the top and bottom. The box 71 is divided into two areas by a partition 72 which runs parallel to the two open sides. One area is open to the upper side of the housing and serves to guide a plug, for which purpose the inside of the box is provided with corresponding guide grooves 73 . The other area of the box, which is open to the lower side of the housing 3 , is additionally open to the receiving chamber 60 , so that the circuit board 62 can protrude into this area of the box. Four pins are soldered to the circuit board, which protrude through openings 74 in the partition wall into the first area of the connector housing 70 , and can be connected there with the corresponding contacts of the mating connector.

In the area of the bottom of the gear chamber 25 , three openings 75 are also provided, which lead into the receiving area 60 . Contact tabs 111 , 117 , 118 of the contact plate 22 protrude through these openings 75 .

Another opening 76 leads from the receiving area 60 through the bottom of the swivel area 31 into the swivel area. Its meaning should be described below in connection with the explanation of the contact plate 22 who the.

As can be seen in FIGS. 1-4, three fastening elements 80 , 81 and 82 are arranged on the outer side of the housing. In principle, these fastening elements can be provided at any point on the housing, depending on how this is required by the installation situation in the vehicle. Be the fastening elements 80 , 81 and 82 each consist of a base with two parallel side walls 83 , 84 which have the shape of a right triangle. A Ka thete of the triangle has the length that corresponds to the height of the Ge housing 3 and connects to the housing 3 . So that the other cathete extends vertically from the housing wall. The side walls 83 , 84 enclose between them a surface 85 which has a fastening eye 86 at the outer end. The other part of the surface can be perforated as far as the rigidity allows. The fastening elements 80 , 81 , 82 can each be arranged so that the eye 86 at the level of the housing cover 17 , at the level of the bottom of the housing 3 or in the middle.

In the following, reference is made to FIG. 6. The area in which the electric motor is flanged has a recess 89 for receiving a bearing for the motor shaft 4 . In addition, recesses 90 , 91 are provided above and below the flange, in which fastening hooks engage, with which the motor housing 92 is fastened to the housing Ge. Either a brush support plate 92 a made of plastic, which is provided with corresponding guide channels 93 for the brushes 94 of the electric motor, can be placed on the flange surface or can be made in one piece with the housing 3 from the start. To power the brushes 94 or to hold the brushes 94 in the corresponding guide channels 93 in the brush support plate 92 , a correspondingly folded holding plate 95 is provided, which can be connected to the contact plate 22 at the bottom of the housing 3 . For this purpose, a breakthrough through the flange surface leads to the gear chamber 25 . On the holding plate 95 tongues 96 are provided, which reach through this opening and can be soldered to the contact plate. In addition, the holding plate has a tongue 96 which can be placed on the metallic housing jacket 97 of the electric motor.

The previously mentioned elements that form the housing, who molded from a single piece of plastic and sprayed pour manufactured. To achieve the necessary rigidity Chen, the plastic contains mineral fibers between 2 mm and 10 mm length. It also contains additives that the plastic resistant to weather influences (ozone) and thus the output shaft directly in the guide sleeve can be stored, give sliding properties.

When designing the base body 20 , care must be taken to ensure that the same wall thicknesses are present in as many areas as possible.

This initially has the consequence that the areas in the bottom of the gear chamber 25 , which take up the choke and the capacitor, emerge as corresponding bulges on the underside of the bottom 53 .

Furthermore, the bearing sleeve 40 is thickened insofar as it protrudes outwards from the dome 41 . This corresponds to a slipped-on facing sleeve, which is slipped over the bearing sleeve visible on the outside of the vehicle in the previous housings, which are not made of plastic. The fact that the entire housing is made of plastic, can be dispensed with a separate facing who. However, this generally presupposes that, as already explained, the plastic consists of weather-resistant material.

As already explained, the upper edge of the base body 20 is flat so that the cover 17 can be placed there. Since, as has already been explained below, the cover 17 also serves as an axial support for the transmission (cap 15 ), there is an increased requirement for the flatness of the upper edge of the edge.

In order to achieve this, the injection mold has to be worked on until, taking into account slight twists that occur when the housing cools down after removal from the mold, a flat edge surface is created. Such follow-up is extremely difficult. Therefore, the following way is suggested (see Fig. 8).

The housing 3 is connected at several points with screws 101 , the associated screw holes 102 of which are arranged in the edge of the housing. In addition to the screw holes 102, there are elevations 100 on the edge, which enclose the screw benloch over a pitch circle to the side surface of the housing 3 . The height of the elevation is slightly less than the height of the seal 103 used between the housing 3 and the housing cover 17th

The individual surveys 100 can easily be brought to the same height by measuring the individual surveys 100 after a first injection molding and after cooling the housing and the casting mold is reworked accordingly, so that the surveys are all at the same height in the subsequently manufactured housings . Since the measurement is carried out at defined points, namely on the elevations 100 , the post-processing of the form is easier to carry out since it only has to be carried out anew at the corresponding points on the form. This is easier than trying to get the entire edge surface flat.

The seal 103 itself is flexible, so that when the cover is screwed to the housing, the seal 103 is pressed down until the cover 17 lies on the elevations 100 .

In the following, the contact plate 22 is described that is shown in FIGS. 9a and 9b. The contact plate 22 is punched from a metal sheet, wherein remain still holding webs between the individual conductor tracks, which are after the A contact of the contact plate 22 in the housing 3 severed. The main conductor track 101 has a central breakthrough 102 through which the pin 26 for the worm wheel 6 projects as soon as the contact plate 22 rests on the bottom of the gear chamber 25 . The main track includes a contact spring 103 , which is bent out of the plane of the contact plate and which has a raised contact 104 at its end, which interacts with a corresponding conductor track on the underside of the worm wheel. Furthermore, it has a contact tab 105 , which is located in the outer region of the contact plate 22 .

Another conductor track 106 runs approximately parallel to the contact spring 103 and carries at one end a second contact tab 107 and at its other end a connecting piece 108 for the inductor 28th A third conductor track 109 , which runs in an L-shape on the outside of the contact plate, has at one end a receptacle 110 for the other end of the choke 28 and ends at the other end in a first contact pin 111 .

This third conductor track 109 has a further connection 112 for the capacitor 29 , the other end of which connects to a connection 113 on the main conductor track 101 . A fourth conductor track 115 is seen with a contact spring 116 , which, like the first contact spring 103, is provided at its bent end with a contact 117 a, which cooperates with a further conductor track on the underside of the worm wheel 6 . The other end of this conductor track 116 also ends in a second contact pin 117 b, which is arranged next to the first contact pin 111 . A third contact pin 118 is located on the main conductor track 101 . The three contact pins 111 , 117 , 118 are arranged side by side.

The main conductor track 101 is connected in one piece to a cooling plate 120 . This extends perpendicular to the Hauptlei terbahn 101 and is connected to this via an L-shaped bent connector 121 . The upper end of the cooling plate 120 is bent over and forms a contact surface 122 for the cover 17 of the housing. A tab 123 is punched out and bent out in the surface of the cooling plate 120 .

If the contact plate 22 is placed on the bottom of the gear chamber, the two contact tabs 105 , 107 are located in the flange for the electric motor immediately before the opening. The brush holding plate 95 has two bent tongues which extend through this opening and contact the contact tabs 105 and 107 , respectively. The contact pins 111 , 117 , 118 protrude through the opening 75 in the bottom of the gear chamber 25 and reach the area of the electronics receptacle 60 . The corresponding pins can therefore also be seen in FIG. 5.

The cooling plate 120 protrudes through the opening 76 in the bottom of the swivel area 31 , so that the lower end can touch the units of the electronics unit to be cooled.

The upper, bent end is then at the level of the end edge of the housing, so that the bent tab 122 touches the cover 17 .

As already explained, the circuit board 62 of the electronics unit has a plurality of contact pins which protrude into the connector housing 70 . This is shown again in section in FIG. 7. This figure shows a section through the Ge housing in the area of the connector housing 70 and the electronics 60 or the pivoting range.

The circuit board 62 is located in the electronics receptacle 60 , to which, among other things, a power transistor 131 is soldered. With the power transistor 131 , a cooling clamp 132 is connected to the. Transistor 131 and cooling clip 132 protrude through the opening 76 in the bottom of the swivel area 31 , where the cooling clip 132 lies flat against the cooling plate 120 . The bent-out tab 121 , because it is supported on the wall of the housing, ensures that the cooling tab 120 bears over the cooling clip 132 over a large area. It can also be seen that the bent end 122 abuts the cover 17 . The cover 17 thus serves as a large-area cooling for the power transistor 131 .

As can also be seen in FIG. 7, and already explained, the circuit board 62 sits a plurality of connecting pins which protrude into the connector housing 70 . The contact pins 111 , 117 , 118 of the contact plate 22 , which protrude into the receiving area 60 , are also connected to corresponding conductor tracks on the circuit board 62 . One of these traces ver binds the contact pin 118 on the main conductor 101 with the ground pin in the connector housing 70th This not only connects a contact spring 103 to ground, but also the brush that contacts the contact tab 105 . In addition, the cover is placed on ground via the heat sink and the bent end 122 . Furthermore, the design of the brush holding plates ensures that the area lying on the ground receives contact with the housing of the electric motor, which is flanged onto the housing 3 . This means that all metallic parts, unless they are used for voltage control, are connected to ground. This means that the electric motor can be easily suppressed.

Via the second contact pin 117 , the second Kontaktfe 116 is supplied with power, via the first contact pin 111 via the third conductor path 109 , which is connected to ground via the capacitor, the second brush, which contacts the contact tab 107 , via the inductor Power supplied.

With this concept, the entire power supply of the electric motor, the switch, which is formed by the contact springs 103 , 116 and the conductor tracks on the underside of the worm wheel, and the electronics unit are supplied with voltage via contact plates, which are supplied via a single plug. Additional wiring outside the housing is not necessary.

The following proposal is made for fastening the contact plate to the bottom of the housing (see FIG. 10). Usually protrude from the bottom of the housing pin 140 , which correspond to corresponding holes in the sheet. As far as the sheet has been inserted, the pin protrudes beyond the surface of the sheet so that it can now be melted down with a hot stamp, forming a mushroom that holds the sheet securely.

Because, as already explained, the plastic with fibers through this method cannot be used without further ado because the fibers themselves do not participate in the deformation to take.

Therefore, the hole 141 in the sheet is conical, so that a relatively sharp edge 142 is formed on one side of the sheet and a wide opening on the other side. The diameter of the upper side of the opening, i.e. where the sharp edge is formed, is slightly smaller than the diameter of the pin.

If the sheet is now pressed onto the pin 140 , these protrude through holes, the sharp edge 142 engaging like a barb in the lateral surface of the pin 140 , so that the sheet 22 cannot be removed again. So that a permanent connection of the sheet 22 with the Ge housing 3 was created.

In order to facilitate the alignment of the sheet before insertion, the upper ends 143 of the pins are tapered.

Another detailed solution can be seen in Fig. 1. The shaft 4 of the motor runs out into an end pin 150 which is applied to a flat contact piece 151 made of metal. This contact piece 151 is inserted into a corresponding groove in the base body 20 .

Since the shaft is held in tension by a corresponding device 152 , frictional heat is generated between the end pin 150 and the contact disk 151 . Since the groove is open at the top, the washer 151 , which is optionally provided with a bent tab, can contact the cover 17 . So that the cover 17 serves as heat dissipation for the resulting frictional heat. At the locating washer 151 can preferably be oval, the long side being inserted vertically into the upwardly open groove.

Attachment of the pin 26 in the housing base. In order to achieve a secure attachment, the pin 26 is first provided with one or more circumferential grooves. In addition, the pin is overmolded during the injection molding of the housing. In this way, the pin is held securely in the bottom of the housing.

As shown in Fig. 2, the pin can be symmetrical to the groove at one end with another groove at the other end, so that when loading the injection molding machine does not have to pay attention to an orientation of the pin.

Since the gearbox described so far is also to be used for a windshield washer, a water supply through the output shaft 11 is provided. This is shown in more detail in FIG. 11. For this purpose, the output shaft 11 is hollow. The feed line essentially consists of a brass tube 200 which is bent at one end. This bent area is surrounded by a holding part 201 made of plastic, which is sprayed around the tube. The holding part 201 initially has a guide part 202 which is inserted into the hollow shaft and centers the tube 200 . The other end is formed into a spout 203 , on which a hose can be pushed. The base body 204 is hen with undercuts with which it can be inserted into an opening in the cover 17 like a bayonet. The other end of the tube 200 is provided with a closure part 205 , which at the same time serves as a carrier for a metal nozzle 206 . For this purpose, the end part 205 has a recess into which the nozzle 206 , whose outer contour is spherical, can be pressed in. The nozzle 206 can now be aligned relative to the end part 205 , so that the washing water strikes the window in a defined area. The end piece itself is provided with a central blind hole 207 , which ends in the receiving area of the nozzle and into which the nozzle bore 208 opens.

The problem now is to fasten the end part 205 so si cher on the tube 200 that the position of the end part itself is not changed when the nozzle 206 is adjusted.

To that end, the sealing part 205 has a guide pin 209 which can be inserted into the metal tube 200, the outer diameter of the pin 209 about the in nendurchmesser of the tube corresponds. However, the fit must not be too tight so that the tubular pin 209 can be pushed into the tube without kinking.

In order to prevent rotation of the end 205 to the tube, an annular projection 210 is additionally seen before, which is arranged coaxially with the tubular pin 209 , so that an annular groove is formed between the projection 210 and the tubular pin 209 , the width of the thickness corresponds to the pipe wall. If the end of the tube is now roughened a little on its outside, milled or the roughness of the surface is increased in some other way, the tube sits with sufficient clamping force in the annular groove between the shoulder 210 and the pin 209 .

The axial length of the projection 210 is determined so that a sufficient clamping force can be generated, the length of the tubular pin 209 is determined so that a sufficient tightness of the carrier 205 is effected with respect to the tube.

Reference list

1 electric motor
2 gears
3 gearbox
4 motor shaft
5 snail
6 worm wheel
7 axis
8 first lever
9 partial sprockets
9 ' pinion
10 second lever
11 output shaft
12 pivot point
13 pivot point
15 cap
17 lid
20 basic bodies
23 electronics unit
22 contact plate
26 cones
27 floor
28 deepening
29 Suppressor choke
29 ′ capacitor
30 groove
31 swivel range
32 level
40 bearing sleeve
41 Recording dome
42 bottom
45 stiffening struts
50 rand
51 contact surface
52 lower edge area
53 floor
55 bases
54 ribs
60 receiving chamber
61 cover
62 circuit board
70 connector housing
71 box
72 partition
73 guide grooves
74 breakthroughs
75 breakthroughs
76 breakthrough
80 fastener
81 fastener
82 fastener
83 side wall
84 side wall
85 area
86 mounting eyes
90 deepening
91 deepening
92 engine housing
92 a brush support plate
93 guide channels
94 brushes
95 holding plate
96 tongue
97 housing jacket
101 main conductor track
102 breakthrough
103 contact spring
104 contact
105 contact flag
106 conductor track
107 contact flag
108 connector
109 third conductor track
110 recording
111 contact pin
112 connection
113 connection
115 conductor track
116 contact tongue
117 a contact
117 b contact pin
118 contact pin
120 heat sink
121 connector
122 contact surface
123 tab
131 power transistor
132 cooling clamp
140 housing pins
141 holes
142 edge
143 end
150 end pins
151 system piece
152 device
200 brass tubes
201 holding part
202 guide part
203 spout
204 basic body
205 final part
206 metal nozzle
207 blind hole
208 nozzle bore
209 guide pin
210 approach

Claims (3)

1. Closure piece for a metallic tube, characterized in that the closure piece ( 205 ) has a central guide pin ( 209 ) which is coaxially surrounded by an extension ( 210 ), so that an annular groove is formed between the guide pin and extension the jacket of the tube is insertable. 2. Closure piece according to claim 1, characterized in that that the closure piece has a longitudinal pocket bore, the opening of which points into the tube. 3. Closure piece according to claim 1, characterized in that that the closure piece has a transverse receptacle that receives a nozzle body, the nozzle channel in the Blind hole.