Twin gear unit with one drive gear wheel and equalised load paths

FIELD: machine building.

SUBSTANCE: twin-gear unit comprises drive gear 1, its bearings being fitted on dampers. Compliance of said dampers is defined from parameters of the unit gears, drive gear rpm and power transmitted. Drive gear compliance allows it to displace toward unloaded path by required amount, hence, equalising load by feedback principle.

EFFECT: optimum overall dimensions and weight, simple and reliable operation.

2 dwg

 

The invention relates to mechanical engineering and can be used, for example, for a two-line two-stage gearbox, which is driven propeller plane with an offset relative to the axis of the motor shaft.

Known double-flow reducer, where the load balancing gain at the expense of precision parts manufacturing and Assembly of the gearbox [1].

The main drawback of this gear is that the adjustment of threads is carried out individually for each gear by adjusting the contact spot of the engagement of each thread, which is quite difficult and time-consuming.

Object of the invention is a two-line reducer with one leading toothed wheel and aligned load flow with a simple and reliable alignment.

This is achieved by the fact that the bearings of the pinion gear that transmits power to two threads, mounted on a pliable support (dampers) with the magnitude of the static supports yield Δ, is equal to:

,

where ε is the total error of the asymmetric manufacture and Assembly of the gears flows;

z1- the number of teeth of the pinion;

m1- the module of the teeth of the pinion;

n is the number of revolutions of the pinion;

N is the power transmitted by the gearbox;

α - angle profile of the teeth leading the pole is either;

β - angle gears flows;

Topis the coefficient of uneven distribution of load flows;

K - correction factor, determined the final design of the gearbox.

Figure 1 shows the kinematic diagram of the gearbox, and Fig.2 is a transverse section of the site, its pinion.

The gearbox consists of a pinion 1, which involves two parties with gears 2 installed on the left and right shafts of two streams, which also installed on the other end of gears 3, associated with the output gear 4.

Bearings pinion mounted on the dampers 5, and its internal splines associated with the external splines of the output of the springs 6 of the engine.

The gearbox works as follows (Fig.1): torque output from the springs 6, for example, from the gas turbine engine comes on pinion gear reducer 1 and through the right and left shafts (two threads) reducer, each of which has two gears 2 and 3 associated with gears 1 and 4 respectively in points 1, 2 and 3, 4, is transmitted to the output gear 4, which is removed.

Load balancing across threads is due to the flexibility of the supports and bearings pinion and move the gear in the direction of light flow in static compliance supports - Δ that p is igodit to the two alignment normal to the surfaces of the teeth forces at points 1 and 2 and consequently, the load-balancing flow.

The advantages of this gearbox are optimal for this design dimensions, weight, simplicity and reliability in operation.

Example: Given N=500 HP; ε=0.09 mm (with the degree of accuracy of manufacturing of gears 6 - 5 - 5, ε1=0,016 mm, ε2=0.024 mm, ε3=0,05 mm [2]); K=1; KP=1,05; z1=21; m=2.25 mm; n=32000 rpm; α=25°; β=27°. Substituting these values into the formula to determine Δ, we obtain:

for the two dampers,

for one damper.

These values correspond to the actual pliability vane dampers[3].

Sources of information

1. Lindelow. "Rational design of mechanisms". Ed. 2nd revised and expanded, M.: engineering, 1972

2. "Multi-threaded reducers". Under. General editorship Iphoria. Kiev, Tekhnika, 1983

3. Wofstream. "Fluctuations rasbalnsirovano rotor on elastic-damping bearings", proceedings of the US, issue 36, 1961

A two-line reducer with one leading toothed wheel and aligned with the load on the threads containing the pinion gear, characterized in that the bearings of the pinion gear that transmits power to two threads, mounted on a pliable support (dampers) with the value of static compliance And supports equal:

where ε - su is the total error of the asymmetric manufacture and Assembly of the gears of threads;
z1- the number of teeth of the pinion;
m1- the module of the teeth of the pinion;
n is the number of revolutions of the pinion;
N is the power transmitted by the gear box;
α - angle profile of the teeth of the pinion;
β - angle gears flows;
ToPis the coefficient of uneven distribution of load across threads;
K - correction factor, determined the final design of the gearbox.



 

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