CN1189132A - Housing made of plastic - Google Patents

Abstract

The invention provides a transmission case shell. The plastic basal body of the invention is sealed with a cover board which is made of metal. The shell is provided with a frame used to ensure the cover board to be arranged on the basal body levelly. A plurality of lug bosses are arranged on the frame and are used as the junction surfaces of the cover board. The end faces of the lug bosses are arranged in a plane through a simple method by trimming an injection mould. The joint between the cover board of the shell and the basal body of the shell is sealed through a sealer which is arranged on the frame of the shell and can not touch the lug bosses.

Description

The housing that is made of plastics

The present invention relates to a kind of housing that is made of plastics, particularly with the mechanism housing of a cavity, cavity is surrounded by frame, adorns a metal cover board on the frame.

In some application scenario, particularly when the axle of transmission gearbox supports on the cover board, cover plate can entirely be contained on the housing.

It is whole in conjunction with frame certain difficulty that run on one plane that the injection mould of plastic casing is done so that.

Therefore the objective of the invention is to, design plastic casing in this wise, make cover plate be placed on the housing in the definite plane especially for transmission gearbox.

Suggestion is provided with a plurality of boss on the edge of housing for this reason, and cover plate is contained on the boss.

In order to make cover plate obtain smooth location, only the end face of boss need be made in the plane now.Injection mould is made by the following method for this reason.At first make a plastic casing, on this plastic casing, measure the relative height of each boss with a preliminary injection mould.According to measured deviation injection mould is repaired at corresponding position.Injection mould in good repair like this can be used as model and is used for continuing the production housing.

To put packing seal on the housing frame, packing seal gets out of the way the position of boss, and its thickness is slightly larger than the height that boss surpasses the housing frame.Packing seal jam-packed when loading onto cover plate makes not to be placed directly in the sealing that regional seal pad on the housing frame provides cleaning at cover plate.

Boss is preferably disposed on cover plate by screw or rivet and housing bonded assembly position.

The preferably half of screw hole that surrounds of boss.

Below introduce an embodiment.

Narrate the structure of self-propelled vehicle wiper device electric-motor drive unit below.As by being clear that the main element of this device also can be used for the electric-motor drive unit of other application purposes in the narration.

Narration is carried out by means of ten accompanying drawings shown in following:

Fig. 1 represents the not electric-motor drive unit of plate with cover, and wherein the part is a top view, and the part is a cutaway view.

Fig. 2 represents along the cutaway view of II-II line among Fig. 1.

Fig. 3 represents the not top view of the mechanism housing of plate with cover, with a contact plate that is placed on the housing bottom surface.

Fig. 4 represents along the cutaway view of IV-IV line among Fig. 3.

Fig. 5 represent from outside towards the view of housing bottom surface, the part is a top view, the part is a cutaway view, with an electronic unit that is placed on the inside.

Fig. 6 represents the back plate of motor brush.

Fig. 7 represents along the cutaway view of VII-VII line housing among Fig. 1.

The partial enlarged drawing of Fig. 8 presentation graphs 2.

Fig. 9 a, b represent to be placed on the contact plate in the housing.

Figure 10 represents a kind of possibility of contact plate at the housing internal fixation.

Figure 11 represents that water flows through the partial view of driven shaft.

At first referring to Fig. 1.

This unit is made up of a motor 1 and a transmission gearbox 2, and motor 1 is fixed on the mechanism housing 3 from the side.This transmission gearbox is a kind of so-called swing transmission gearbox.

This unit is made up of following elements.Motor shaft 4 extends, and on its lengthening one end a worm screw 5 is housed.It and worm gear 6 mesh.Rotatably link to each other at swivel point 13 places prejudicially with first lever 8 of a quadrant gear 9 axis 7 with worm gear 6 with respect to worm gear 6.Another quadrant gear 9 on quadrant gear 9 and the driven shaft ' be meshed.A centre of gration 12 on first lever 8 is hinged on the driven shaft 11 in this wise by second lever 10, makes pivot point 12 move on the part circumference of driven shaft 11 axis all the time.

When worm gear 6 passed through the motor unidirectional drive, because first lever 8 connects at the double-strand chain of swivel point 12,13, it did a forced movement, impels driven shaft 11 to move back and forth.By suitably selecting quadrant gear 9,9 ' and the geometric parameter of hinge- point 12,13, can adjust to almost any one degreeof turn of driven shaft 11.

As especially seeing that by Fig. 2 the axle of swivel point 13 protrudes in first lever 8 slightly.Cover 15 of cover on this end, it slides on the bottom side of the cover plate 17 of mechanism housing 3.

Be provided with a mechanism housing 3 in order to support this driving device, it is made up of two parts.First is a plastic substrate 20, and it has a plurality of cavitys.Maximum cavity is used for installing worm gear 6, makes that matrix 20 is a jar shape or basin shape basically.Matrix 20 openings one side is closed by the metal cover board of having mentioned 17, and it constitutes the second portion of mechanism housing.

Matrix 20 is used for controlling other elements of motor except the also supporting of supporting driver element, in them especially electronic unit 23 (see figure 5)s contact the contact plate 22 of boss with a band, contact the respective switch circuit that the boss edge is contained on the worm gear 6 and slide.

For these elements can be installed, on matrix 20, be provided with other cavitys or hole, should do more detailed elaboration to this by means of Fig. 3,4 and 5 below.First zone is used for installing worm gear 6, therefore should be called worm gear chamber 25 below.It is circular, and has the degree of depth that is equivalent to the worm gear height basically.As what can see, put a contact plate 22 on the bottom surface in worm gear chamber by Fig. 3 with flushing.There is a bearing pin 26 in the central authorities in chamber, and it constitutes the axis of worm gear 6.This bearing pin is fixed on the bottom surface, worm gear chamber 27 in the corresponding hole 28.

The bottom surface also have other recess 28 ', 28 ", pack in its inside an interference protection inductance coil 29 and cond 29 ', they are contained on the bottom surface of contact plate 22.Be connected with a groove 30 on the worm gear chamber 25, the worm screw 5 on the motor shaft 4 of lengthening is contained in this groove.For axle can pass, groove 30 is connecting a breach at axis direction, and it is till the flange of motor 1.Groove 30 is an opening towards place, worm gear chamber, thereby worm screw 5 and worm gear 6 can be meshing with each other.On the opposite side in worm gear chamber 25, turn over 90 ° approximately with respect to groove 30, and motor flange there is a tow-away zone 31 dorsad, as what can be clear that by Fig. 1, it is used to provide the revolution possibility of first and second throw of levers 8,10.

This tow-away zone 31 is restricted to rectangle towards the outside, its bottom flat, and shallow more many than worm gear chamber 25, between worm gear chamber and tow-away zone 31, can form a step 32 thus.

For hold supporting sleeve 40 in the tow-away zone 31 and the connecting portion in worm gear chamber 25 be provided with the supporting boss 41 of a jar shape.The seamed edge of supporting boss 41 is the height of 31 bottom surfaces from the tow-away zone haply.The bottom 42 of supporting boss 41 is also more much lower than the bottom surface in worm gear chamber 25.Because the outline of boss 41 is charged into worm gear chamber 25 partly, pruned at this regional boss wall.There is a supporting sleeve 40 in the central authorities of boss, and it is 31 bottom surface height from the tow-away zone, pass the bottom surface 42 of boss 41 and stretch out.Reinforced rib is distributing on the whole height along boss between boss inwall and supporting sleeve 40 outer walls.In the part, just reamed at the regional reinforced rib of charging into worm gear chamber 25.

Said zone: worm gear chamber 25, groove 30, tow-away zone 31 and boss 41 are surrounded by a frame 50, and seamed edge is distributed on the same height on it, is used as the faying face 51 of metal cover board 17, puts into packing seal between seamed edge and the cover plate where necessary.

By Figure 4 and 5 as can be seen, frame 50 extends partially to the below of individual areas bottom surface.Can see that in Fig. 5 lower frame district 52 surrounds the downside of 25 bottom surfaces 53, worm gear chamber in about 180 ° scope.From four muscle 54 that distributed this crosses 52 to central base 55 in lower frame district of prolongation of bottom surface downside, base protrudes in the downside of bottom surface 53 equally, and as by what can see among Fig. 2, it is used for installing bearing pin 26.

Can see that the bottom surface 42 of base 55 and boss 41 stops at similar same height place.Arrange 3 reinforced ribs between base 55 and boss 41: middle muscle 56 is stretched over the axis of boss 41 from the center of base 55, two side muscle are tangent with base 55 and boss 41 respectively.

So select such muscle sheet to arrange to be because the bearing pin (rotation axis of worm gear 6 just) and the axis of driven shaft 11 must keep position accurately each other, occur noise when avoiding the motor operation.In order to reach to this necessary rigidity, base 55 not direct connection on supporting sleeve 40, a but at interval middle boss 41 with diameter bigger than supporting sleeve 40.Therefore can bear reversing of to occur better by muscle sheet 56,57.Supporting sleeve 40 is securely fixed in the boss 41 by reinforced rib 45 itself.

Frame 50 in 31 scopes of tow-away zone also stretches out downwards, makes to form an installation cavity 60 on a side of tow-away zone 31, and it is used for installing electronic control package 23.This can be clear that especially in Fig. 5 and, and wherein seals cover plate 61 partly cut-aways in this chamber, makes the thin plate 62 of adorning electronic component above can seeing.Installation cavity 60 1 sides are by the frame that stretches out downwards, and opposite side is surrounded by muscle sheet 54 and side muscle 57.

A plug casing 70 is done at the position tangent with the wall in worm gear chamber 25 on the sidewall of tow-away zone 31 and installation cavity 60.This plug casing is the box 71 of a rectangle, and it all is an opening downwards upwards.Box 71 is divided into two zones by a dividing plate 72 that is parallel to the side distribution of two openings.Regional opening is up to the upper side of housing, and is used as the guiding of plug, and the medial surface of box has been equipped with corresponding guide groove 73 for this reason.The regional opening of another of box is up to the downside of housing 3, and it is open towards a side of installation cavity 60, makes thin plate 62 can stretch into this zone of box.Be welded with four pins on thin plate, they pass the first that plug casing 70 is stretched in hole 74 on the dividing plate, can be connected with the corresponding contact of corresponding plug there.

Base surface area in worm gear chamber 25 is provided with three breaches 75 equally, and they lead to installation cavity 60.The contact disk 111,117,118 of contact plate 22 passes these breaches 75.

Another breach 76 is from the bottom surface feeding tow-away zone of installation cavity 60 by tow-away zone 31.Its effect will be done further narration with contact plate 22 in the back.

Can see that by Fig. 1-4 lateral surface of housing is provided with three tightening members 80,81,82.These tightening members can be arranged on any position on the housing according to the mounting condition in the vehicle in principle. Tightening member 80,81 is formed with 82 each free base with the sidewall 83,84 of two parallel distributions, and they have the shape of right-angled triangle.The length on a limit of triangle is equivalent to the height of housing 3, and is connected on the housing 3.Therefore another square edge extends perpendicular to housing wall.Surround a face 85 between the sidewall 83,84, a fastener hole 86 is arranged on its outer end.As long as rigidity allows, the other parts of this face can disconnect. Tightening member 80,81,82 can be arranged respectively like this, makes hole 86 on the height of case lid 17, the height of housing 3 downsides or extend in the centre.

Below with reference to Fig. 6.Has a recess 89 in motor flange bonded assembly zone, in order to the bearing of motor shaft 4 to be installed.The upper and lower of this external flange bonding pad is provided with recess 90,91, and fastening hook embeds in these two recesses, and these fastening hooks of electric machine casing 92 usefulness are fixed on the housing.A plastics brush back plate 92a (it is equipped with the corresponding guide channel 93 that is used for motor brush 94) both can be installed on flange face, also can make an integral body with housing 3.In order to give brush 94 power supplies, and for fixed carbon 94 is provided with the adapter plate 95 of a corresponding bending in the corresponding guide channel 93 of brush back plate 92a, it can link to each other with the contact plate 22 on housing 3 bottom surfaces.An opening passes flange face and feeds worm gear chamber 25 for this reason.Be provided with a reed 96 on adapter plate 95, it passes this opening, and can with the contact plate weld together.Adapter plate has a reed 96 in addition, and it can be fitted on the metal case 97 of motor.

Above element said, that constitute housing make by plastic monoblock, and by injection molded.Contain 2mm to the long mineral fibres of 10mm in order to reach the necessary rigidity plastics.Therefore it also contains additive in addition, so that plastics are not subjected to climatic influences (ozone), and when making driven shaft can directly be bearing in the orienting sleeve, provides good sliding capability.

When design matrix 20, must be noted that, make All Ranges have same wall thickness as far as possible.

This zone design that shows 25 bottom surfaces, worm gear chamber that inductance coil and cond are installed at first highlightedly is corresponding projection on the downside of bottom surface 53.

Secondly supporting sleeve 40 part to outer process from boss 41 is thickeied.This is equivalent to the sheathing of a turnup, up to now be not the outside that its turnup can observable supporting sleeve on vehicle in the housing made of plastics.By make whole housing, decoration that can be independent by plastics.Usually its precondition is that as noted earlier, plastics are made up of weather-proof material.

As previously mentioned, the upper side frame of matrix 20 is made a plane, therefore can put cover plate 17.Because as having illustrated than the front, cover plate also is used as the axially mounting (cover 15) of driving device, so the planeness of seamed edge on the frame is proposed higher requirement.

In order to reach this requirement, injection mould must be trimmed under the situation that occurs slight distortion when considering that housing takes out after cooling from mould can form a smooth seamed edge upper surface.A kind of like this finishing is difficulty especially.Therefore following method (see figure 8) is adopted in suggestion.

Housing 3 connects with screw 101 in many places, and the rib of housing is provided with corresponding screw hole 102.Also have boss 100 on the housing rib except that screw hole 102, it surrounds screw hole on partial circle till the housing side.The height of boss is slightly less than packing seal 103 used between housing 3 and the housing cover 17.

Each boss can be made easily on same height, as long as measure each boss in housing injection moulding for the first time with after cooling off, and injection mould is done corresponding finishing, makes its boss of housing of then processing all on same height.Because at certain point, just boss 100 is measured, the correction ratio of mould is easier to carry out, because its only needs carry out again at the corresponding position of mould.This makes the plane easily than attempting with the whole faceted pebble of going up.

Therefore packing seal 103 itself is flexible, and when cover plate and housing are tightened, packing seal 103 is understood and compressed, till cover plate 17 is fitted on the boss 100.

Introduce contact plate 22 below, it is drawn on Fig. 9 a and the 9b.Contact plate 22 is formed by a sheet material punching out, wherein also leaves the connection tabula between each strip conductor, and they are severed after contact plate 22 is packed housing 3 into.Leading electric rail 101 has a medium pore 102, and the bearing pin 26 of worm gear 6 passes this hole, is attached to until contact plate 22 on the bottom surface in worm gear chamber 25.Belong to the connect spring 103 that also has of main orbit, it arches upward from the contact plate plane, and at its end the contact 104 of a projection is arranged, it with the worm gear bottom surface on strip conductor mating reaction accordingly.Secondly it also has a contact boss 105, and they are positioned at the outer edge area of contact plate 22.

Another strip conductor 106 similar with connect spring 103 parallel distributions, the one end has one second to contact boss 107, the other end has the joint 108 of an inductance coil 28.To be distributed in the outside of contact plate the 3rd strip conductor 109L shape, the one end has a bearing 110 that is used for inductance coil 28 other ends, and the other end ends at first contact pin 111.

The other end that this 3rd strip conductor 109 has another joint that is used for cond 29 112, cond is connected a joint 113 of dominating on the electric rail 101.The 4th strip conductor 115 is provided with a connect spring 116, the same with first connect spring it also be provided with a contact 117a at its end that arches upward, another strip conductor mating reaction on it and worm gear 6 bottom surfaces.The other end of this strip conductor 115 ends at one second contact pin 117 equally, and it is located at the next door of first contact pin.The 3rd contact pin 118 is positioned on the leading electric rail 101, and these three contact pins 111,117,118 are arranged side by side mutually.

Leading electric rail 101 and a cold plates 120 fuse.Cold plates extends perpendicular to leading electric rail 101, and links to each other with it by a L shaped connecting panel that arches upward 121.The upper end of cold plates 120 forms a faying face 122 of housing cover 17 through bending.Punching out and be bent into a liner plate 123 on the surface of cold plates 120.

When contact plate 22 was contained on the bottom surface in worm gear chamber, two contact boss 105,107 directly were in the front of motor flange breach.Brush attachment panel 95 has the reed of two bendings, and they pass this breach, and contacts boss 105 and 107 and contacts.Contact pin 111,117,118 passes the breach 75 on the bottom surface in worm gear chamber 25, arrives electronics package installation cavity 60.Therefore in Fig. 5, also can see corresponding contact pin.

Cold plates 120 passes the hole 76 on 31 bottom surfaces, tow-away zone, makes its lower end can touch electronic unit to be cooled.

An end of bending just is positioned on the height of housing in conjunction with rib like this, makes the flat board 122 of bending touch cover plate 17.

As mentioned above, the thin plate 62 of mounting electronic device has a plurality of contact pins, and they insert Socket casing 70.This shows once more with cutaway view in Fig. 7.This figure represents the cutaway view by housing Socket casing 70 zones and electronics package installation cavity 70 and tow-away zone.

Put a thin plate 62 in the electronics package installation cavity 60, also welded a power discharging transistor 131 above it.Cooling hoop 132 links to each other with power discharging transistor 131, aerotron 131 and cooling hoop 132 holes of passing on 31 bottom surfaces, tow-away zone 76, and wherein cooling is bound round 132 and is attached on the cold plates 120 with flushing.The flat board 121 of bending is bearing on the housing wall, and it is used for making cold plates 120 to be attached on the cooling hoop 132 in large area.In addition as can be seen, the end 122 of bending is attached on the cover plate 17.Therefore cover plate is used for the large tracts of land cooling of power discharging transistor 131.

As can also see by Fig. 7 and illustrated that thin plate 62 had a plurality of nipple pins, they stretch into plug casing 70.The contact pin 111,117,118 that stretches into the contact plate 22 of electronics package installing zone 60 links to each other with corresponding strip conductor on the thin plate 62 equally.The contact pin 118 that this strip conductor will be dominated on the electric rail 101 links to each other with the ground joint pin of plug casing 70.Therefore connect spring 103 ground connection not only, and with contact also ground connection of boss 105 contacted brushes.The end 122 of this outer cover plate by cold plates and bending be ground connection also.Secondly when the design brush attachment panel, consider that the connected to chassis part contacts with the electric machine casing that is connected on the housing 3 with flange.Therefore so long as not all metal partss that are used for conducting electricity ground connection all.Therefore motor can prevent to disturb at an easy rate.

Second connect spring 116 is by second contact pin, 117 supplying electric currents, by first contact pin 111, by 109, two of the 3rd strip conductors by capacitor grounding with contact the brush that boss 107 contacts, by the inductance coil service voltage.

Whole power supplys in motor, the loop that constitutes by the strip conductor on connect spring 103,116 and the worm gear bottom surface in this scheme, and electronic unit is by the contact plate service voltage, voltage is by unique plug input.Need be in extra wiring beyond the housing.

In order contact plate to be fixed on the housing bottom surface as following suggestion (see figure 10).Usually give prominence to some pins 140 from the housing bottom surface, they match with corresponding hole on the plate.Pin protruded in the upper surface of plate after plate was put into, and making it have only with hot die could depress its fusing, at this moment forms a mushroom head, and it is fixing reliably with plate.

Because said above, adopt the plastics of band fiber then can't adopt this method without a doubt, because fiber itself does not participate in distortion.

Therefore make bevelled hole 141 onboard, make a side of plate form a sharper keen rib 142, opposite side forms a bigger hole.The upside in hole, its diameter of place that just forms sharp edge is slightly less than the diameter of pin.

Now when plate being pressed on the pin 140, pin passes the hole, and at this moment sharp edge 142 embeds the shell surface of pin 140 as barb, makes plate 22 not drop out again.Thereby plate 22 forms lasting being connected with housing 3.

Centering is convenient when packing into for plate, and pin upper end 143 is done tapered.

In Fig. 1, can see another details.Motor shaft 4 has one section axle head 150 in the end, it leans against on the smooth metal backup 151, and this block 151 is inserted in the matrix 20 corresponding grooves.

Because motor shaft is keeping predetermincd tension by corresponding device thereof 152, produce friction heat between axle head 150 and the block 151.Because groove is upwards open, block 151 (it is provided with the flat board of bending under the necessary situation) can contact with cover plate 17.Therefore cover plate 17 is used for distributing the friction heat of generation.Baffle plate 151 preferably can be done ovalisation, and the open groove that makes progress is inserted on wherein long limit.

Bearing pin 26 is fixed on the housing bottom surface.Fix in order to obtain failure-free, bearing pin 26 at first is equipped with one or several circular groove.

During this external injection-moulded housing bearing pin together injection moulding wrap in the inside.Be fixed on housing bottom reliably by such method bearing pin.

As shown in Figure 2, bearing pin can with an end one groove another groove on the other end is done symmetrically, make the direction that not should be noted that bearing pin at the injection machine when filling with substance.

Because above-mentioned transmission gearbox also should be used for the glass spraying-cleaning device, so be provided with a water entry by driven shaft 11.This draws in Figure 11 in more detail.Driven shaft 11 is made hollow for this reason.Coolant inlet pipe mainly is made up of a thin copper pipe 200, its an end bending.This sweep is surrounded by a plastic fixtures 201, and it is injection molded that it is wrapping thin copper pipe.Connecting element 201 at first has a targeting part 202, and it inserts hollow shaft, and makes thin copper pipe 200 be fixed on central authorities.The other end is made a mouth of pipe 203, can overlap a flexible pipe on it.Matrix 204 has the side otch, can plug-in type ground packs in the hole of cover plate 17 with it.The other end of thin copper pipe 200 is furnished with an end piece 205, and it is used as the support of metallic nozzle 206 simultaneously.End piece 205 has a depression for this reason, and appearance profile is that ball-shaped nozzle 206 can be pressed in this depression.Nozzle 206 can be found the direction with respect to end piece 205 accurately, makes water be sprayed onto certain position on glass.End piece 205 itself is provided with a central blind hole 207, and it arrives till the installation region of nozzle, and leads to burner bore 208.

Problem is that end piece 205 is fixed on the thin copper pipe 200 so reliably now, makes that end piece 205 positions own can not change when adjusting nozzle 206.

End piece 205 is provided with a guiding tenon axle 209 for this reason, and it can insert thin copper pipe 200, and wherein the external diameter of tenon axle 209 roughly is equivalent to the internal diameter of pipe.Cooperating definitely can not be too tight, so that the tenon axle 209 of tubulose can not have deflection ground to insert thin copper pipe.

In order to prevent that end piece 205 from rotating with respect to thin copper pipe, it is additionally provided with an annular boss 210, and it and the 209 concentric installations of tubulose tenon axle make to form a circular groove between boss 210 and the tubulose tenon axle 209, and its width is equivalent to the thickness of tube wall.Now the terminal cylindrical of thin copper pipe is made slightly more coarse (milling thick or additive method), copper pipe is fixed in the circular groove between boss 210 and the tenon axle 209 with enough gripping powers.

The axial length of boss 210 is determined like this, makes to produce enough gripping powers, and the length of tubulose tenon axle 209 is determined like this, made support 205 play enough sealing function with respect to thin copper pipe.

Claims (5)

1. with the plastic casing of a cavity (25), cavity is surrounded by frame, and cover plate (17) is contained on the frame, it is characterized in that: frame has a plurality of boss (100), and cover plate (17) is placed on the boss.

2. by the plastic casing of claim 1, it is characterized in that: put pad sealing together on the housing frame, it gets out of the way boss, and its thickness is slightly larger than the height that boss surpasses the housing frame.

3. by the plastic casing of claim 1, it is characterized in that: boss is located at the position that cover plate is connected with housing by screw or rivet.

4. by the plastic casing of claim 3, boss surrounds screw hole at one side of something.

5. by each the injection molding making method of housing of aforesaid right requirement, it is characterized in that: at first make a plastic casing with preliminary injection mould, on this plastic casing, measure the relative height of each boss, according to the corresponding site of the deviation finishing injection mould that records, continue to produce housing as model then with the injection mould that trims like this.

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