12.1. Description of a design
VAZ-21074 transmission: 1 - a shaft, 2 - an epiploon of a main shaft, 3 - a coupling case; 4 - spring washer; 5 - сапун; 6 - needle bearing of a secondary shaft; 7 - gear wreath of the synchronizer IV of transfer; 3 - switching fork III and IV transfers; 9 - the sliding coupling of the synchronizer III and IV of transfers; 10 - nave of the coupling of the synchronizer III and IV of transfers; 11 - gear wheel and gear wreath of the synchronizer III of transfer; 12 - gear wheel and gear wreath of the synchronizer II of transfer; 13 - fork of switching of I and II transfers; 14 - coupling of switching of I and II transfers; 15 - gear wheel and gear wreath of the synchronizer I of transfer; 16 - intermediate bearing of a secondary shaft; 17 - gear wheel of the V transfer; 18 - gear shifting lever; 19 - gear shifting lever case; 20 - expansion plug; 21 - flange of the elastic coupling; 22 - secondary shaft; 23 - epiploon of the back bearing of a secondary shaft; 24 - back bearing of a secondary shaft; 25 - maslootrazhatelny washer; 26 - bearing of the block of gear wheels of the V transfer and backing; 27 - block of gear wheels of the V transfer and backing; 28 - transfer synchronizer V nave; 29 - intermediate gear wheel of a backing; 30 - back cover; 31 - back bearing of an intermediate shaft; 32 - the sliding coupling of the synchronizer I and II of transfers: 33 - stopper of a jellied opening; 34 - intermediate shaft; 35 - forward bearing of an intermediate shaft; 36 - transmission case; 37 - back bearing of a main shaft; 38 - the directing plug.
Description of a design
The VAZ-21074 transmission - mechanical, with manual switching, has five transfers of the forward course and one — back. All transfers of the forward course are synchronized.
Case details of a box — a coupling case, actually a case of the transmission and a back cover — are cast from aluminum alloy and pulled together among themselves with hairpins with nuts. Connections are condensed with cardboard laying (at repair it is possible to use sealant). For improvement of the heat sink a surface of a case of the transmission of an orebrsn. From below the case is closed by a steel stamped cover with laying (the crash — on hairpins). The case of coupling fastens bolts to the block of cylinders of the engine. For ensuring coaxiality of a bent shaft and a main shaft of the transmission the case is aligned on two plugs (under them pro-points in fixing openings of the block and a case are executed). On a back cover of the transmission the third support of the power unit is established. The rubber pillow of a support fastens to a cross-piece, and the last — to body floor arms via rubber plugs.
In a case of the transmission the jellied (control) opening, in its lower cover — drain is on the left side located. Openings are closed by traffic jams with a conic carving. In a drain stopper there is a magnet. It detains the steel particles getting to oil at wear of details. In the top part of a case of coupling it is established сапун. It interferes with increase in pressure in the transmission at its heating. In case of malfunction of a sapun (jamming of a cap) the strong leak of oil through consolidations is possible.
In the transmission three shaft: primary, secondary and intermediate. The main shaft leans on two ball bearings — in a back end face of a bent shaft and in a forward wall of a case of the transmission (the last perceives the main part of loading). In a back end face of a main shaft устаноилсн the needle bearing serving as a forward support of a secondary shaft and providing coaxiality of shaft. The secondary shaft also leans on the ball bearing in a back wall of a case of the transmission and the roller bearing in its back cover. The intermediate shaft rotates in two bearings: forward — two-row ball, is located in a forward wall of a case of the transmission, back — roller, located in its back wall. Via the block of gear wheels of a backing and the V transfer the intermediate shaft also leans on the roller bearing in a back cover of the transmission. On a back wall of a case of a box also the axis of an intermediate gear wheel of a backing is fixed.
The main shaft has two gear veni. The Kosozuby wreath located closer to a forward wall of a case is in continuous gearing with a forward gear wheel of an intermediate shaft (thus, these shaft always rotate together). The Pryamozuby wreath of a main shaft is a transfer synchronizer IV wreath (at its inclusion the torque is transferred directly from a main shaft to secondary, passing intermediate therefore this broadcast is often called "straight line").
The intermediate shaft represents the block from four kosozuby gear wheels. At inclusion of any transfer, except IV, the torque is transferred to a secondary shaft through intermediate. Gear wheels of an intermediate shaft are located in the following order (from its forward end): a gear wheel of continuous gearing with a main shaft, gear wheels III, II, I transfers. By the back end of a shaft a bolt the block from two gear wheels fastens: backing (pryamozuby) and V transfers (kosozuby). It in addition leans on the roller bearing in a back cover of the transmission.
On secondary to a shaft the conducted gear wheels III, II, I transfers, a backing, the V transfers (one after another, considering from the forward end of a shaft) with synchronizers (except transfer of a backing), and also the leading gear wheel of the drive of a speedometer which enters gearing with the conducted gear wheel of the drive established in a back cover are located. The conducted gear wheels of transfers of the forward course are in continuous gearing with the corresponding gear wheels of an intermediate shaft. Gear wheels III and II transfers rotate on the tempered necks of a secondary shaft, gear wheel of I and V transfers — on plugs. The conducted gear wheel of a backing is rigidly fixed on a shaft by a spline. At the same time with to-sozubymi gear wheels of transfers of the forward course wreaths of their synchronizers — pryamozuby gear wheels of smaller diameter are executed. They are directed towards the corresponding synchronizer (III. I, V - forward, II — back). On the back end of a secondary shaft the nut fixed a flange of the elastic coupling of the driveshaft. The nut of a flange is fixed from an otvorachivaniye the lock washer enclosed under it, unbending its edges on the verge of a nut, or apply sealant on a carving, and the washer is not established.
The synchronizer consists of the nave which is rigidly fixed on secondary to a shaft, the sliding coupling, the lock ring blocking rings and springs with a washer. Naves of III—IV and the I—II synchronizers of transfers enter internal ledges grooves on secondary to a shaft, and the nave of the synchronizer V of transfer is kept by the same spline, as the conducted backing gear wheel. On an external surface of naves there are vents on which the sliding couplings will mix up. On couplings there are bores which forks of rods of gear shifting enter. The blocking rings are connected by the internal wreaths to ayenets of synchronizers of the corresponding gear wheels and drawn in by springs aside as-zyashikh couplings. Springs lean on a side surface of the conducted gear wheels through washers.
Transfer of a backing has no synchronizer. For its inclusion it is necessary to enter an intermediate gear wheel into gearing with the conducted gear wheel of a secondary shaft and with the leading gear wheel of a backing in the back block of gear wheels on intermediate to a shaft.
The drive of control of the transmission consists of three rods connected to forks. Forks of inclusion of transfers of the forward course enter bores of the sliding couplings of synchronizers, and a fork of inclusion of a backing — bore on an intermediate gear wheel.
The mechanism of the choice of transfers consists of the directing plate with eight rectangular cuts in the center, the top and lower washers, the lever of gear shifting and its case and a blocking bracket of a backing. These details are pulled together with three bolts which the mechanism of the choice of transfers fastens to a back cover of a box. "Neutral" position of the lever between III and IV transfers is set by two couples of sprung directing levels established in grooves of the directing plate and influencing the lower end of the lever. Casual inclusion zalne-go the course instead of the V transfer is impossible thanks to the unbent petal of the blocking bracket against which the ledge on the lever rests. To include transfer of a backing, it is necessary to press the lever down — at the same time its ledge falls below a bracket petal.
Details of the transmission are greased with spraying. Primary and secondary shaft are condensed with epiploons, and on secondary to a shaft behind the conducted gear wheel of the V transfer the maslootrazhatel-ny washer is located. In the transmission fill in gearbox oil with viscosity from 75W80 to 85W90 and GL-4 is not lower than a class of quality. Its level has to be at the lower edge of a jellied opening (previously be convinced of that. that the car costs horizontally).