Two-step planetary transfer case

FIELD: transport engineering.

SUBSTANCE: invention relates to drives of all-wheel-drive cross-country vehicles designed for riding along roads and off-road. Proposed two-step planetary transfer case contains upper planetary reduction gear providing two speeds of transfer case, intermediate shaft with gear 5 and lower planetary reduction gear being essentially differential drive for rear and front driving axles. Driving member of upper planetary reduction gear is crown gear 9 stationary connected with drive shaft 8, driven member is carrier 13 and controlled member is central gear 11. Gears of upper planetary reduction gear, driving gear 4, intermediate gear 5 and driven gear 6 and gears of lower differential mechanism are arranged in one row one over the other.

EFFECT: reduced overall dimensions adapted for mounting transfer case on vehicles.

1 dwg

 

The invention relates to transport machinery, namely, to drive vehicles mounted on polnoprivodnykh the vehicles intended for movement both on public roads and off-road.

Known transfer case (RK), comprising: a body placed in it by shafts and gears, differential gear, planetary gear and clutch control. In this RK sun gear of the planetary gear mounted on the input shaft, a carrier connected to the intermediate shaft with the planet carrier of the differential, and the epicycle wheel tubular shaft connected with the crown located between the support body and the crown of the intermediate shaft. Increased load capacity of Kazakhstan in the reduction of consumption of materials (Cm. RF patent №2149768, IPC 60 To 17/16 from 24.02.98).

The disadvantages of this transfer case: large axial dimensions, due to the coaxial arrangement of the Vedas. shaft and one of the output shafts from the differential, and a large gear ratio of the planetary stage.

For the prototype, as the most similar in essential features, taken a RK design, comprising: a housing that holds the shafts and gears, differential gear, planetary gear and clutch control. Here the sun gear of the planetary gear mounted on the input shaft, is convinced is a continuation of the output shaft.

The disadvantages of this transfer case: large axial dimensions because of the nature of the composition, and a large gear ratio of the planetary stage due to the fact that the driving member is a Central gear, and the slave - driven.

The task was to construct the transfer case is relatively small axial dimensions, adapted for installation on transport vehicles.

The problem is solved due to the fact that in the two-stage planetary gear comprising upper planetary gear, allowing you to receive two transmission in gear, the intermediate shaft with gear lower planetary gear, which is a differential drive for the rear and front axles, the leading part of the upper planetary series is the crown gear is fixedly connected with the drive shaft, and to reduce the axial dimensions of the gear upper planetary gear, intermediate gear and the lower gear of the differential mechanism arranged in one row on top of each other on mutually parallel axes.

At the same time to obtain the required gear ratio from 1.4 to 1.6 leading element of the planetary series is the crown gear, the slaves were taken, and the braking element of the Central gear.

The analysis of the level of t is the transport of patent and other scientific and technical documentation has allowed to establish, what analogue characterized by signs, identical with all the essential feature of the claimed technical solution is not found.

Comparative analysis of the proposed technical solution and similar allowed to establish the presence of significant distinguishing characteristics, therefore the proposal meets the conditions of patentability.

The claimed technical solution is illustrated in the drawing, which shows a two-stage planetary gear box.

Transfer case consists of a crankcase 1, bearing housings 2 and 3, the upper planetary gearbox with pinion 4, the intermediate gear 5, the lower planetary gear with the driven gear 6.

The upper planetary gear consists of the input flange 7 that is installed on the control shaft 8 made integral with the crown gear 9. Thus, the driving shaft 8 is the leading element of the planetary series. With the teeth of the crown gear 9 meshed satellites 10, and those, in turn, meshed with the Central gear 11. Satellites 10 rotate on bearings on the axes of the satellites 12. Axis satellites are pressed and fixed in the cheeks drove 13. With the planet carrier 13 and the hub 14 is bonded leading gear 4, rotating on bearings 15. The Central gear 11 is stationary mounted on the hollow shaft 16, the other end of which slots p is smasana stationary toothed clutch 17, on the outer splines which adjustably mounted gear cage 18 with external and internal teeth. Move the gear cage 18 is a fork of the switch 19, fixed on the rod 20, which is connected with the piston of the pneumatic cylinder 21. Serrated ferrule 18 may alternately be connected or with a ring gear 22 of the shaft drove 13, or with the internal teeth of the ring 23, is rigidly fastened to the body.

Leading gear 4 top gear meshed with the intermediate gear 5 mounted on the shaft 24 rotating on bearings 25.

The intermediate gear 5 meshed with the driven gear 6 of the lower drive planetary gearbox.

The lower planetary gear differential mechanism is based on a cylindrical planetary gear. It consists of a carrier 26, the crown gear 27, the Central gear 28, 29 satellites. Support planetary mechanism are the bearings 30 mounted in the crankcase 1. Movable toothed ring 31 is designed for differential lock.

The differential distributes the power flows in a certain proportion between the front and rear driving axles.

Transfer case works as follows: the torque from the engine through the gearbox is transmitted to the input flange 7, further driving shaft 8 and the crown above the Turney 9 of the planetary gear. Crown gear through satellites 10 is connected with the Central gear 11 and with the planet carrier 13. Drove 13 still connected with the pinion 4 and is a slave link.

The Central gear 11 is driven element and kinematically through the hollow shaft 16 and the sleeve 17 and the movable toothed ring 18 may be connected with the crankcase 1 or with the shaft splines pinion carrier 13.

In the first case, when moving the movable gear cage 18 to the right, the Central gear 11 is locked on the housing, the slave link, i.e. the carrier 13, and with it the leading gear 4 rotates at a reduced speed from 1.4 to 1.6 times depending on the internal gear of the planetary gearbox. Transfer case included lower transmission and the increased torque is transferred to either the driven gear 6 and, through the differential mechanism, the front and rear axles.

In the second case, when moving the movable carriage to the left of the Central gear 11 is interlocked with the planet carrier 13, the relative rotation of the links relative to each other becomes impossible. Transfer case included top gear - speed-driving gear become equal to the speed of the input shaft.

The proposed design meets the requirement of industrial applicability and can be made on the standard equipment used is the Finance of modern technology.

Two-stage planetary gear box, containing the upper planetary gear, allowing you to receive two transmission in gear, the intermediate shaft with gear lower planetary gear, which is a differential drive for the rear and front axles, characterized in that the driving member of the upper planetary gear is a crown gear is fixedly connected with the drive shaft, the slave - drove and managed the Central gear, and to reduce the axial dimensions of the gear upper planetary gear, the leading, intermediate and driven pinion gear and the lower gear of the differential mechanism arranged in one row on top of each other.



 

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EFFECT: improved design.

1 dwg

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FIELD: transport engineering.

SUBSTANCE: invention relates to drives of all-wheel-drive cross-country vehicles designed for riding along roads and off-road. Proposed two-step planetary transfer case contains upper planetary reduction gear providing two speeds of transfer case, intermediate shaft with gear 5 and lower planetary reduction gear being essentially differential drive for rear and front driving axles. Driving member of upper planetary reduction gear is crown gear 9 stationary connected with drive shaft 8, driven member is carrier 13 and controlled member is central gear 11. Gears of upper planetary reduction gear, driving gear 4, intermediate gear 5 and driven gear 6 and gears of lower differential mechanism are arranged in one row one over the other.

EFFECT: reduced overall dimensions adapted for mounting transfer case on vehicles.

1 dwg

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