Rotary mechanical device

 

(57) Abstract:

The invention relates to mechanical transmissions and can be used for accurate turning on the given arbitrary angle. Rotary mechanical device includes a platform, a hard gear, thrust ball bearing, stepper motor, a sleeve, a telescopic device and two pressure roller wave generator. The platform is mounted on a rigid toothed wheel and is based on the thrust bearing. Flexible toothed wheel is mounted on the base. On the flange of a flexible wheel mounted stepper motor. On the motor shaft firmly planted sleeve associated telescopic device with pressure rollers wave generator. The rollers are biased by springs in the radial direction. The technical result - the expansion of the scope of the proposed transmission while reducing overall mass. 1 Il.

The invention relates to mechanical transmissions and can be used for accurate turning on the given arbitrary angle, as well as for continuous rotation around a vertical axis that can be used for mapping using optical or radar devices, the high precision, high gear ratio and small overall dimensions and mass characteristics. Can also be applied in the calibration settings to specify exactly corners.

Known variation-and-chain transmission, comprising a housing, driving and driven shafts, driving and driven in the axial direction of the conical Polushkina with radial teeth, covering the conical Polushkina chain, whose links pivotally interconnected and provided with prismatic stops with gradients of their blades in accordance with gradients of radial teeth conical Poloskov and mechanism of axial movement of the conical Poloskov, characterized in that the articulated chain rollers with longitudinal slots with spring clamps and rail stops are made along the axes of the articulated rollers, which have the possibility of a spring-loaded longitudinal displacement and axial rotation, and in a free state every hinge roller is set so that the projection of the blades of his prismatic lugs are arranged perpendicular to the longitudinal chain, and cheeks chain with rollers or sliding stops, see RF application for the invention under 98118657/28.

The disadvantages of this transfer are: change (products, as well as its production, is also quite large dimensions.

Known wave-mechanical transmission consisting of two wheels: one wheel flexible, more rigid, flexible wheel inside moving mechanical volnoobrazovaniye, such as a Cam, which forms on the wheel "wave", and she drives a hard wheel (see "mechanical Wave transmission" ed. Research Institute of mechanical engineering. - M.: 1976 Bauman. Bauman, page 4-18) prototype.

The disadvantages of such programs for all positive properties (with respect to the actuator antenna system RLS) are:

static dead stroke, which occurs due to gaps in the chain of the engine - output link of wave transmission;

significant elastic dead stroke due to elastic bending deformation of the flexible wheel;

the eccentricity of the generator and rigid casters, which depends on the accuracy of manufacture of parts of the wave transmission and cannot be eliminated because of the dimensional chain, which determines the position of the axes of the generator and the rigid wheel is quite long;

the cantilever arrangement of the motor with respect to the output shaft, which leads to harmful bending effect of the antenna column, see RF application 2000122784/20 (024172), in which the reducer contains: bushing-drum, hard wheel, flexible wheel, two small pushbuttons bearing, six or eight small bearings, output shaft, large bearing, large-toothed, small-toothed, with bushing-drum with one end has an external diameter of a large-toothed, and the inner diameter is based on the large bearing, firmly planted at one end of the output shaft, with the other end of the sleeve drum through small plates and bearings in contact with the inner diameter of the flexible wheel, which through a small gearing connected with a rigid wheel, and the flexible wheel is rigidly connected with the other end of the output shaft, the output shaft is mounted in angular contact bearings and is the transmission output, the input is large gearing with a drive motor through a gear wheel of the prototype.

The disadvantages of this gearbox are pretty high overall-mass characteristics (GMH), hence the increased cost and inconvenience in operation. If the application in terrestrial antenna systems, radar, he still can be tolerated when applied to the fast expansion of applications while reducing GMH.

This goal is achieved by the following construction, which includes a platform, a rigid toothed wheel, a flexible toothed wheel, thrust ball bearing, stepper motor, a sleeve, a telescopic device, two of the pressure roller wave generator, with the platform installed on the hard gear of the wave gear, which is based on the thrust bearing, flexible as a gear wheel mounted on the base, the flange inside the flexible wheel mounted stepper motor, on the shaft which is rigidly planted sleeve associated telescopic device with pressure rollers wave generator, which in turn biased by springs in the radial direction.

The drawing shows a cross section of a rotary mechanical device along the longitudinal axis of symmetry, which shows:

1 platform, 2 - hard gear wave transmission, 3 - thrust ball bearing, 4 - flexible gear wave transmission, 5 - base, 6 - stepper motor, 7 - pressure rollers wave generator, 8 - radial springs, 9 - sleeve engine with telescopic devices 10.

Platform 1 is installed on the hard toothed wheel 2 wave transmission, which operatzaile the engine 6. The wave generator consists of two pressure rollers 7, biasing springs 8 in the radial direction with the aim of sampling backlash in the gear mesh. On the motor shaft sits motionless sleeve 9, which is connected with pressure rollers telescopic device 10.

Rotary mechanical device operates as follows. Motor (stepper or asynchronous managed) transmits the rotation of the sleeve 9 wave generator, through which the telescopic device 10 rotates the pressure roller 7 around the axis of the motor shaft. Pressure rollers, objetivas on the inner surface of the stationary flexible wheel 4, create two waves of deformation of the flexible wheel, as a result of this hard wheel 2 together with the platform 1 is slowly rotated about its axis. Thanks to the spring preload roller gaps in engagement flexible and rigid wheels are missing, and the transmission works as leftovers. Spring 8 one end of which is pressed on one pressure roller, the other on the other roller. This design creates the same constant pressure on the flexible wheel gearing, which provides a high smoothness of the transmission.

This design wave generator allows to eliminate the influence of Volchkov and jamming. In addition, the motor shaft is loaded only torque and wholly exempt from radial loads. The teeth of the flexible and rigid wheels can be manufactured by standard methods with the usual degree of accuracy. If necessary, such as changing the position of the base 5 in the space, can be installed the second thrust bearing.

Additionally it can be noted that such design and location of the engine inside the flexible wheel (all existing structures of the wave gear motor is located outside of the flexible wheel) can significantly reduce overall mass characteristics, simplifies the issue of sealing (if required) transfer.

Thus, the geared motor is now one, and the engine fit in the dimensions of the gearbox and the whole system became more compact. It is seen that the torque on the output shaft does not depend on applied load. Therefore does not change its kinematic accuracy. This gives you the opportunity to dramatically increase the dynamic characteristics of the actuator. The gear ratio of the proposed actuator are within the 70-300, and the error (keeping the specified angle of rotation) does not exceed one has the requirements and so on

Rotary mechanical device comprising a platform, a rigid toothed wheel, a flexible toothed wheel, thrust ball bearing, stepper motor, a sleeve, a telescopic device, two of the pressure roller wave generator, with the platform installed on the hard gear of the wave gear, which is based on the thrust bearing, a flexible gear wheel is mounted on the base, the flange inside the flexible wheel mounted stepper motor, on the shaft which is rigidly planted sleeve associated telescopic device with pressure rollers wave generator, which, in turn, is biased by a spring in the radial direction.

 

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