Transmission
1 – bottom cover; 2 – oil level check hole plug; 3 – gear of the 2nd gear of the intermediate shaft; 4 – gear of the third gear of the intermediate shaft; 5 – intermediate shaft (gear block); 6 – front bearing of the intermediate shaft; 7 – clamp washer bolt; 8 – intermediate shaft front bearing clamp washer; 9 – intermediate shaft constant mesh gear; 10 – thrust washer of the synchronizer spring of the IV gear of the primary shaft; 11 – primary shaft; 12 – front cover; 13 – primary shaft seal; 14 – rear bearing of the primary shaft; 15 – clutch housing; 16 – gearbox housing; 17 – breather; 18 – constant mesh gear of the primary shaft; 19 – needle bearing of the front end of the secondary shaft; 20 – toothed ring of the 4th gear synchronizer; 21 – sliding clutch of synchronizer of IV and III gears; 22 – III gear synchronizer locking ring; 23 – synchronizer spring of the 3rd gear; 24 – gear of the 3rd gear of the secondary shaft; 25 – secondary shaft gear 2; 26 – hub of the sliding clutch of the synchronizer of the 1st and 2nd gears; 27 – secondary shaft; 28 – 1st gear pinion of secondary shaft; 29 – gear bushing; 30 – secondary shaft intermediate bearing; 31 – secondary shaft reverse gear; 32 – gear shift lever rod; 33 – thrust cushion; 34 – elastic bushing; 35 – spacer sleeve; 36 – locking sleeve; 37 – gear shift lever outer cover; 38 – gear shift lever inner boot; 39 – spherical washer of the ball joint of the lever; 40 – gear shift lever; 41 – secondary shaft rear bearing seal; 42 – flange of the flexible coupling of the cardan shaft; 43 – secondary shaft rear end nut; 44 – seal of the centering ring of the elastic coupling of the cardan shaft; 45 – centering ring of the flexible coupling of the cardan shaft; 46 – secondary shaft rear bearing; 47 – speedometer drive pinion; 48 – speedometer drive; 49 – rear cover of the gearbox; 50 – reverse gear fork; 51 – intermediate reverse gear; 52 – intermediate shaft reverse gear; 53 – reverse intermediate gear axle; 54 – intermediate shaft 1st gear pinion; 55 – magnet; 56 – magnetic plug
The car is equipped with a four-speed gearbox with synchronizers on all forward gears.
The gearbox consists of primary 11, secondary 27 and intermediate 5 shafts, crankcase 16 and gear shift mechanism.
The primary shaft 11 is made as a single unit with the constant mesh gear 18. It rotates on two ball bearings, the front one is pressed into the socket of the crankshaft end, the rear bearing 14 is placed in the gearbox housing and is sealed by the oil seal 13.
The secondary shaft 27 is mounted in three bearings. The front needle bearing 19 is mounted in the bore of the primary shaft, the middle bearing 30 is a ball bearing, pressed into the socket of the crankcase 16 of the gearbox, the rear bearing 46, located in the socket of the rear cover 49, is sealed with an oil seal 41. The gear 28 of the first gear, gear 25 of the second gear, gear 24 of the third gear are freely located on the secondary shaft; they are in constant engagement with the same gears of the intermediate shaft.
On the front end of the secondary shaft there are three splines on which the hub of the sliding clutch 21 of the synchronizer of the III and IV gears is located. The hub 26 of the sliding clutch of the synchronizer of the I and II gears is connected to the shaft in a similar way. The gear 31 of the reverse gear is fastened to the shaft with a key. The driving gear 47 of the speedometer drive is located on the rear neck of the shaft. The flange 42 of the elastic coupling of the cardan shaft is mounted on the splines of the shaft and is fixed with a nut 43.
The intermediate shaft 5 is made as a single unit with the gear block and rests on two bearings; the front bearing 6 is a ball bearing, fixed on the shaft by a washer 8 and a bolt 7, the rear bearing is a roller bearing, cylindrical. The reverse gear 52 is located on the splines of the shaft.
The intermediate gear 51 of the reverse gear rotates freely on the axis 53, pressed into the holes of the gearbox housing and its rear cover 49.
The synchronizers of all gears have the same design. Each of them consists of a hub 26, a clutch 21, blocking rings 22 and springs 23. The hub is rigidly connected to the secondary shaft. A sliding clutch is located on the external splines of the hub. The blocking ring is connected with its internal crown to the crown of the synchronizer of the gear of any forward gear and is constantly pressed towards the sliding clutch.
Gear shifting is carried out using a mechanical drive consisting of three rods 16, 17, 18 (see Fig. Gear shift drive), on which forks 14, 15, 1 are fixed, entering the grooves of the sliding clutches of the forward gear synchronizers. And fork 1 enters the annular groove of the reverse intermediate gear. In the neutral and engaged positions, the rods are held by ball locks 23, and the simultaneous engagement of two gears is prevented by lock 19.
The gear shift lever is composite, its lower part is connected to the upper part through a damper device (pos. 9, 10, 11, 12). This connection allows the gearbox to be removed from the vehicle without "unnecessary" disassembly. The gear shift lever is placed with its head in the ball joint 4 and is pressed against it by the spring 7 through the spherical washer 6. The lever is prevented from turning by a pin that enters the hole in the ball head of the lever and the joint 4.