RU2674788C1 - Four-axle wheeled vehicle torque divider - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: invention relates to the four-axle vehicle with a PTO torque divider. Torque divider contains a lockable differential, providing the differential connection between the first – second and third – fourth axes, primary shaft with the lower and higher gears rotating gears with possibility of locking with the primary shaft, rigidly connected to the differential intermediate shaft. Differential front shaft and the differential rear shaft are connected to the semi-axial gears with the splines. Torque divider further comprises mounted on the torque divider housing power take-off shaft disconnection mechanism.EFFECT: enabling reduction in the divider dimensions and increase in the wheeled vehicles flotation ability.1 cl, 1 dwg

Description

FIELD OF THE INVENTION

The invention relates to mechanical engineering and can be used in transmissions of wheeled vehicles.

State of the art

The prior art transfer case (RU 2235026, published August 27, 2004) with a power take-off box, comprising a transfer case body connected to a power take-off case, a drive shaft, an intermediate shaft, and a power take-off shaft mounted in said bodies rolling bearings, a drive gear located on the drive shaft and meshed with an intermediate gear associated with the differential of the front and rear axles of the chassis, gear coupling halves, characterized in that it is equipped with a divider m, connected to it by a lubrication pump and a gear located on the power take-off shaft, the divider is installed coaxially to the drive shaft between the drive shaft and the power take-off shaft and is made in the form of two rings entering one into another with a gap, the first ring being fixedly mounted in the power take-off gearbox housing, and the second - with the possibility of rotation on the end of the drive shaft, grooves are made on the outer and inner surfaces of the first and second divider rings and on the outer surface of the drive shaft, the axle is in the drive shaft th channel communicating between a radial channels made in the first and second rings divider and the drive shaft, wherein in the PTO housing passage is provided for supplying lubricating fluid from the pump lubricant to first divider ring. The disadvantage of this box is the large dimensions, which reduces the patency of wheeled vehicles.

Disclosure of invention

The objective of the claimed invention is to reduce the size of the box and increase the patency of wheeled vehicles.

The problem is solved due to the fact that the transfer case of a four-axle wheeled vehicle contains a lockable bevel symmetrical differential, which provides differential coupling between the first - second and third - fourth axes, a primary shaft on which roller bearings are mounted on which lower and higher gears freely rotate locked by input shaft, countershaft rigidly and permanently connected to a differential mounted on two spherical roller bearings ah and it consists of the housing assembly, the spider, the four planet gears, and two side gears where the front axle differential and rear differential splined shaft connected to the side gears, the mechanism further comprises disabling the PTO shaft mounted on the transfer case.

Brief Description of the Drawings FIG. 1 - sectional design of the gearbox, where 1 is the differential, 2 is the crankcase, 3 is the spherical bearing, 4 is the front differential shaft, 5 is the rear differential shaft, 6 is the intermediate shaft, 7 is the input shaft, 8 is the drive gear, 9 is roller bearings, 10 - top gear, 11 - low gear, 12 - clutch, 13 - crankcase cover, 14 - breather, 15 - crankcase, 16, 17 - covers, 18 - shaft, 19 - spline sleeve, 20 - ball bearing , 21 - couplings, 22 -, 23 - power take-off flange.

The implementation of the invention

The declared transfer case of a four-axle wheeled vehicle is used to transmit torque from the gearbox to the axle gearboxes, to provide power take-off and to increase the torque when driving in difficult road conditions.

The transfer case is installed in the middle part of the frame on brackets with covers that are attached to the frame side members and cover the transfer case suspension brackets with rubber cushions. In the lower part, the transfer case is connected by a jet draft to the right frame side member.

The transfer case is a three-shaft gearbox with helical helical gears and has a lockable bevel symmetrical differential 1, which provides differential coupling between the first - second and third - fourth axles of the tractor wheels. All shafts of the transfer case are mounted in cast-iron housing 2 with a cover 13 and mounted on ball and roller bearings.

On the primary shaft 7 on the roller bearings 9, gears 10 and 11 freely rotate, which can be locked with the primary shaft 7, moving along the splines of the coupling 12. Moreover, gear 10 refers to the highest gear, and gear 11 to the lowest.

When moving the clutch 12 to the far right, the highest gear is engaged, the leftmost is the lowest. The intermediate shaft 6 is rigidly and constantly connected with the differential 1.

Differential 1 is mounted on two spherical roller bearings 9 and consists of a split housing, a spider, four satellites and two semi-axial gears. The front shaft 4 and the rear shaft 5 of the differential 1 are connected to the axle gears by splines.

The crankcase of the interbody differential lock mechanism is bolted to the crankcase. The locking mechanism consists of a spline sleeve mounted on the shaft, a locking clutch, a locking engaging fork and a pneumatic differential locking switch. The clutch, moving along the splines of the sleeve, rigidly blocks the front and rear shafts with the differential housing.

From the intermediate shaft through the gear block, the torque is transmitted to the drive mechanism of the backup steering pump. When towing a tractor, the backup pump is driven from the gear with which the gear unit is connected.

The gear of the drive of the backup pump is in constant engagement with the gear of the drive of the backup pump. When towing the chassis by moving the rod, the gear engages the gear (not shown).

On the crankcase 2 of the transfer case, a power take-off shaft disconnect mechanism (MOM) is located. MOVOM is designed to transmit torque from the transfer case to the power take-off. MOVOM is a mechanism consisting of an aluminum crankcase 15 and covers 16 and 17. A power take-off gear is installed in the crankcase 15. The front gear support is a roller bearing 19, the rear one is a ball bearing 20. On the power take-off shaft on its splines, a power take-off flange 23 is connected to the driveshaft and further to the power take-off.

A pneumatic switch is installed in the cover 16 (included in the design 16). To enable the power take-off, it is necessary to supply air to the cavity A, the coupling position 21 will move to the leftmost position and will engage with the splined sleeve 22.

By its design, the pneumatic switch is similar to the switch between the interbody differential lock in the transfer case. The output ends of the shafts are sealed with cuffs and the covers with cardboard gaskets.

The internal cavity of the transfer case housing communicates with the atmosphere through the breather 14. The transfer case is forced to lubricate, includes an oil intake with a filter net, pipelines and a left-hand gear pump (for example, NSh-10). For lubrication and oil change in the transfer case, there are control-filler and drain holes, and two cargo screws are provided for dismantling.

The power take-off shaft and differential lock in the transfer case are controlled electropneumatically from the driver's seat, and the backup steering pump is switched on when towing by mechanically moving the fork rod to a fixed position inside the body. The differential lock in the transfer case and power take-off shaft are engaged only with the transfer case and neutral in the gearbox disconnected. The power take-off shaft and the inter-differential are switched on by the corresponding keys on the dashboard (not shown) of the system switch-on, while the air from the electropneumatic valves enters the pneumatic switches. After overcoming a dangerous section of the track, the differential lock must be immediately turned off.

The mechanism for disabling the power take-off shaft mounted on the transfer case allowed to reduce the overall dimensions of the transfer case in height by 30 mm.

The introduction of a lower gear (I) into the transfer case made it possible to increase the tractor's off-road patency. The gear ratio of the transfer case (1.357 - the lowest, 1.0896 - the highest) allows you to achieve optimal traction and dynamic properties of the tractor.

On the basis of this transfer case, it is possible to manufacture transfer cases with various power take-offs, both from the input shaft and from the power take-off shaft. It is also possible to install various pumps for the customer (versatility).

Claims (1)

Transfer case of a four-axle wheeled vehicle, containing a lockable bevel symmetrical differential providing differential coupling between the first, second, third and fourth axles, a primary shaft on which roller bearings are mounted on which lower and higher gears freely rotate with the possibility of blocking by the primary shaft, intermediate a shaft rigidly and permanently connected to the differential, which is mounted on two spherical roller bearings and consists of a split housing, a crosspiece, etyreh satellites and two side gears where the front axle differential and rear differential splined shaft connected to the side gears, the mechanism further comprises disabling the PTO shaft mounted on the transfer case.

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