This invention relates to a wmdscreen wiper system tor an automoMe.
la the fdot art wi^^ sy«ten!i&, a totaty link i& attached to the tnotoc by a wocca gsaxing tnecV^asusesv. TVue/»& me/:.Vh3aui»!n& ^y&svk Vv?v« n^ is^ 4iiKKfasxk dlA2fGi%e& ti!\%t ^svcx%2i»t tii^ to^ cif^^dope cS \3n& mcAta. IFYflrthci, Iflne geacriing TnccVijanfleaffi may bave a Im^ me;i^a "wViftdn tesiuilte im \ovt efficiency and Ui^bac)dai^.
An object of the present invention is to overcome the problems aforementioned and to provide a wiper system which minimises fdctina and the ptesfflice points of coaveotionaL g^a£%. ^iL'ii^iiiK iw pcifet*^ Vyakunc^d, «sttt>c^ vifon^on ^vt and vyorcV opeiz^ion. B«.%av»& libre. component are m compressian, l£hey cannot stnear oS %e tradioionsii gear teeifh.
In the present invention a rotary link capable of reciprocating flie wiper blades throi^h link structures, is attached to the low speed ou^ut shaft 19 of a Cycloidal Speed reducer . .4n isfvt f^}3fi 7(}a^ speed sOiafi) is operaify engaged to the outpia s^aaft 19 0ow speed shaS ) bj' the Cy'chidaA speed reducer 4 such ^tat it rotates at a faster speed ^ttcai the oi^ut shaft 19 (hw sg&sd shaft) . A matar 3 is apcraWy cojgsgsd to dtc iapttt sfctft^ 7 (iftqgft speed shaA ) and controls the rotation of the input shstR T 0a^ speed shaA j . Operation of the motor 3 thus also controls the motion of the output shaft 19 (low speed shaft ) and rotary link 31 creating concentric motion.
Brief description of the dranvii^s
Advantages of the j»%sent invention will be apparent from the following detailed description of exenyilary embodiments tiiereoj^ \^ch description should be considered in conjwicHon mj^ tite aceompanying ^amngs, in which:
Fig. I isd view ofdts wiper matac dttd wipir^ s^^item of the pccseat ktv^satcott; Fig.2 i& a perspective view, shown in isoistion, of a wiper motor of the system of
Fig. I; Fig,. 3 is a schematic diai^am of the system of Fig, 1;

/

Trig. 4 is an exploded \iew oi a Cydoidai Speed reducer of Hhe Wiper Motor shown m
Fig.2; Fig. 5 is a view of a switch finger mould supeiimposed on the sfip iing 1 of a non
conductii^ plate. Fig,. 6 is. 3. ^bAmatiA diagram sunilaj; to Fig,.?i siwawin^ yet ajtwathat aU^maJta
%!nnk
txrlooicimtxA. oi 1he invention atnd is a View of 1he Va^ ta6o ( %7-.\> afnang^ntent, Fig. 10 is a plan view of a counter wa^ which forms a part of 1iie speed reducer irf
Fig.l; Fig. 11 is a view of an aimuhis assembly arrangement; FIG. 12 is a block dta^am of the wiper tnotor and wiping system, of the tiew (
Fig.l2aL> aj£wipt«s«at<^Fig.l2b^ijsveatiou:,
DuscnrtpttoTi oi pTeterred embodiments
Fig.l
sltrttsiit DC mtAoi 3 t DC moioi tj^pea ■. Axial illwa, R2i&<& itax, BTuaMeira type (c«> "wilfti \WTOYI> roUiles a rotary lihk 31 throu^ a cycloidal speed reducer 4 to effect movement of a v^per blades 57. The said motor ( DC motor types : Axial flux, TLadial flux, Brushless type (or) with brush). Arratigement is assembled on die said input shaft in engagement with the bearing fitted in the output shaft and rotatable about said second axis by said motor. The present invention i& ap^fills/^k t» vvAfsas. viiputg system. ';;oc!isA!:uc4km&. A& tepte^ooHalxs/^ of tb^ pcceent
wipctig system 1 includes a wipet aiin & Wade assembly 55 opeiativeJQ? connected to a lotary link 31 througn liiik structures (four bar linkage) 5%.

Fig2
A wiper motor 3 is operated in a low speed mode or a W^ speed mode., or in an off modfi. In. the tii^ and low speed, mode^, powet i& supplied, to tha txwatQt: 3 via. an. operatot svfi^^Vi. Isv an off TSK^ ^m v a fesd ge-ai \S os ¥>mg gaas pans ISa. TV«. feved ^«,as l^ comprises a ifJioiaiidity of fixed geai teetti oi T^ing geai pins ^^ a- ^ 1he il&ostialed errA^odomenl, the fixed gear teetti (or) ^Ring gear pins 13a are cylindrical pins liaving axes extending parallel to the second axis (or) motor shaft axis 52.
The Fing, gpar pins 13 a ace mounted in a circular array can the inside of the Bing, ^ar \vau!sjffi% of ttvt G^asfcox output IS. TVvt anray of %aw t«« . TVvt ^woAftt 'wtagjA 16 rrainimzes ^Ira^lion of Ihe speed reducer due to eccentaic movemenl of tVie cam 11 and Hhe drive gear about the mput sliafl (W^ speed shaft) axis 52.
The cycloidal speed reducer 4 also is substantially shorter than other speed reducers of the %arae load capacity and. teductLaa ratio. Thi& reduced asdal length. \& iixupottant because the etoik 1aeigJ\t of tlvt speed T«d\kc«i, that is, the asial extent of the redws^ei hetweea the tftotoc i acrid tine lotary lank 31, is a ciilitai domemsion in ptovidang efficient packaging of a vwpci.
The cychAdal speed tedncet 4 has a telatsvety Vagh toad capacity heeaviae thete ase muhtple gear teeih 15a in at least partial contact at aU times. In addition, the drive gear 15 has sitraight tooth profiles, which are relatively mexpensive to manufacture. The dri^^e gear 15 can be molded from plastic rather than made from metal. To reduce cost and wei^t as needed for an application such as a small car. Maldi\g the drive gear 15 from plastic rather than metal is acceptable became the load is shared over a greater number ofteelk 15a as compared to other 4esi^2s of speed reducers.
Fig. 11
Cycloidal speed reducer includes a ring gear housing 10 having an annulus 50 , cover 9late 61 , rubber seal 62 assembled by screw 63,Grease is ajpplied on this cover plate 61 to twsaismie ftk-tiosv.
It wffl be appreciated that various other embodiments of tlus fflvention are possible i^thout departing from the scope and ambit of this mvention.

We Cham:
1. A wind screen witper system for an automobile compiising a cycloidal speed reducer having a power input shaft provided with a cam disposed in line with a power ou^ut shaft, the said shafts beit^ connected together such that the input sha& rotates faster than the output sha#; an annulus disposed in hne mth the power input shaft, the annulus teeth numb&ing one naore than the cfec teeth of die cydaidal speed osducer; an arr^' of output pins on said output shaft which project axi&Uy in to the openings of ^Q cycloidal disc; said openings being larger than said output pins; a motor coupled to the input shaft to control the speed of rotation of the input shaft:, a rotary link mounted on the output shaft, the totaryt link being, cajpabte of teci^rocating, the wiper blads.%