The MAZ gearbox is equipped with five ranges,aggregates with diesel engine YMZ-236. It has an accelerating range and remote control. There are also several other modifications of this node. To activate the second and third speed synchronizer is involved. Consider the device of this car unit and its features.
Essential elements
Gearbox MAZ includes a primary shaft withgear mounted on the crankcase with ball bearings. In addition, there is an intermediate shaft. From the front, it looks like a device on a cylindrical roller bearing, and from the rear, it looks like a ball analog. The compartment of the rear element is protected by a cast iron lid, the gear of the first and reverse gear is cut directly on the shaft, and the remaining ranges and power take-off are carried out via driving gears mounted on the keys.
The MAZ gearbox with a remote control is equipped with a drivegear shaft with damper damper. This allows you to reduce vibrations transformed from the power unit to the transmission box. In addition, this solution makes it possible to reduce the noise of the functioning of the gear at idle. The necessity of mounting the damper is due to the lack of uniformity of operation of the motor type YMZ-236.
Gear tooth made separately from the hub.It is disconnected using six cylindrical springs. Residual oscillations are damped by deformation of the spring elements and friction in the damper assembly.
Device
Between intermediate and secondary shaft laterallyan axis is installed with a pair of roller bearings and a reverse gear. The front gear element aggregates with the first-speed analog using an additional shaft, and the rear gear engages by activating reverse gear.
On the MAZ semi-trailer the frontal part of the secondaryThe shaft is mounted on a roller bearing, and the rear element is mounted in a ball bearing bath. On the protruding part there is a gear drive of the speedometer, the back of the part is protected by a cover in which there are an epiploon and a speedometer drive. On the splined rear shaft there is a first and reverse gear shift mechanism. It is worth noting that this gear is equipped with straight teeth.
Features
On the secondary shaft gearbox MAZ on steel bearingsfreely installed sliding gear design. This includes adjusting second, third, and fifth speeds. Elements are protected from longitudinal displacement by means of oblique teeth and stop rings. Three gears have a constant engagement with the intermediate shaft. Gears are made with a tapered base and internal toothed surface.
Synchronizers are located between gearelements of the second and third speed. They provide silent inclusion of work gears. The synchronizer itself consists of a coupling, which is located on the splines of the rear hub, as well as the housing with bronze sealing rings. The skeleton aggregates with the clutch by means of ball-type fixers. Gear sleeves are provided on the coupling. Her fingers pass through special sockets; rings with pins and a switching fork are attached to them outside.
Gearbox MAZ "Zubrenok": work
When this node is in operation, the body case ringpressed against the cone gears. In this regard, the friction between the contacting surfaces causes the cranking and installation of the hollow on the slot with the coupling finger, while the element is blocked by the housing.
Then the framework interacts with gearcone due to the resulting force applied to the gear selector. After the frictional effect between the rotation accounting cones and the gears with the clutch occurs, the load forces are leveled and the locking device releases the clutch from the synchronizer base. Next, the clutch moves by squeezing the balls of the locking device, which is shifted to the side. Then the gear ring of the knot engages with the internal teeth of the mechanism, which entails the inclusion of one or another gear.
Operation scheme
В приливочных гнездах крышки картера имеются три adjusting rod. Their plugs aggregate with the first and reverse gear control carriage, as well as with a pair of clutch synchronizers. The switches are equipped with ball locks and locks.
Схема КПП МАЗ, представленная ниже, подтверждает, that the most loaded bearings receive lubrication under the generated working pressure. Oil comes from the bath through the detachable filter element. It is equipped with a magnet that allows fluids to flow by sucking a gear pump. This unit is driven by the leading edge of the intermediate shaft. Next, the mixture is injected along the groove in the crankcase, flows through the channel of the primary and secondary shaft into the bearings of the gears of the mechanism. The remaining elements are lubricated by spraying incoming oil.
Oil pump
Gearbox MAZ-4370 is equipped with an oil pump,which has a ball valve that serves to limit the oil pressure in the transfer box system. The crankcase is equipped with an internal partition that causes the release of waste oil through two openings, blocked by special plugs.
Контроль передач осуществляется посредством lever, which is located in the cockpit. The principle of the circuit is the mechanical switching of the remote drive, located above the power unit. A pair of support rollers are provided in the bracket of the crankcase cover of the transmitting unit, which are used to switch speeds by means of grooves and necks placed on the adjustment rods.
In the middle position the lever is located with a pinlock and spring up. At this time, the lower analog fuse is activated along with the spring. The pin outside is mounted in the swinging compartment of the first and reverse gear. The leash is mounted on a hinge pin mounted in front of the box cover.
Other Details
The MAZ semi-trailer in the gearbox system is equippedfront roller, which controls the second lever, inserted into the head of the movable rod bracket. The outer part of the rolling stock is connected to the intermediate control mechanism using the cardan elongated thrust. The fixing bracket is mounted on the frame of the car.
The lower edge of the lever is connected to the same node.switch. The method of attachment is similar to the above method. Part of the lever passes through the cab floor, ensuring the integrity of all other connections. This design makes it possible to tilt the cabin without the need for separation and deformation of existing elements and components.
In conclusion
More I would like to dwell onfeatures of the gearbox machine MA3-2G0. This unit is almost identical to the device on the 500th MAZ. The drive gear does not have a damper, but the second, third and fifth speeds are activated by means of a secondary shaft on needle-type bearings. The switching lever is placed on the ball bearing, the body of which is fixed on the cover of the switching box. It has a reversing activation fuse, as well as a spring pin mounted in the steering bracket socket. The considered node perfectly proved itself as a direct competitor of domestic and foreign analogues, in accordance with the combination of price and quality parameters.
