Gear ratio converter

FIELD: mechanical engineering.

SUBSTANCE: gear ratio converter comprises planet differential provided with the driving carrier and central gear wheels of different diameters. One of the gear wheels is secured to the output shaft for permitting power transmission to the output shaft. The second gear wheel loads the friction device with a given sliding force. The driven part of the friction device is rigidly connected with the third central gear wheel that freely rotates on the output shaft and transmits rotation to the fourth central gear wheel through the reduction gear. The fourth central gear wheel is rigidly connected with the output shaft.

EFFECT: simplified design.

1 dwg

 

The invention relates to the field of engineering and other mechanisms that require a change of gear ratio when the load changes on the output shaft. An example of such a mechanism may be a gear tool, in particular of the wrench, the clutch mechanism of the vehicle, the gearbox of the helicopter or gyroplane.

There are various ways of solving the optimization problem of the value of gear ratio in the transmission of motion from the motor to the actuator. The most common are gears. They are described, for example, in II Artobolevsky I.I. "Mechanisms in modern engineering". Volume 4 "gears". Moscow. Science, 1980

The disadvantage of such devices is that when they are used, the gear ratio of the transmission constantly, and based on valid technical specifications such as weight, engine power and other, it is difficult to create on the output shaft to the desired torque. Introduction in the design of technologically complex devices, such as electronic controllers, increase the cost of construction and reduce reliability.

Object of the invention is the implementation of the change gear ratio from the engine to the output shaft in accordance with the change of the required torque on the output shaft of the mechanism, when the optimal regenerate engine the simplification of the device, reducing the cost of production.

This goal is achieved by the fact that according to the invention as a Converter gear ratio, use a device that contains a planetary differential with leading planet carrier and different diameter Central toothed wheels, one of which is rigidly fixed on the output shaft of the transmission power of the engine to the output shaft, and the second is loaded on the leading portion of the friction device with a known force slippage that generates brake torque and regulatory ratio, while the driven part of the friction device rigidly connected with the third Central gear wheel freely rotatable on the output shaft, and which, through the gear transmits the rotation of the fourth gear wheel, rigidly connected with the output shaft. Moreover, the smaller the difference between the diameters of the Central gears, the greater the range of change of the gear ratio.

The invention is illustrated in the drawing, which shows schematically the planetary differential transmission of rotation on the drive shaft and the friction device. According to the invention the rotation from the drive shaft 1 is transmitted to the carrier 2 with the housing. On the drive rod has a pair of satellites 3 and 4, rigidly interconnected, the which rotates freely on the driver. Satellite 3 rolls on the Central toothed wheel 5 fixed on the output shaft 6. The satellite 4 rolls on the Central wheel 7 which is free to rotate on the output shaft and rigidly connected with the leading part of the friction device 8. Driven part of the friction device 9 is rigidly connected with the toothed wheel 10, a freely rotating on the shaft 6, through which the gear 11, 12, 13, the axes of which are located on the body-the driver, transmits rotation to the gear wheel 14 rigidly connected with the output shaft.

At low required torque when the friction device is not turned, the whole mechanism rotates with the output shaft as a whole and its elements relative to each other still. When this ratio is minimum and equal to 1. In great need of the moment of rotation of the carrier 2 will lead to the forging of satellites 3 and 4 around the Central wheel and the difference between their diameters to turn them against each other and rotate the friction device. However, in accordance with the value of the required torque and the moment of slippage in the friction device will change the gear ratio from the shaft 1 to the output shaft 6, will change torque.

Converter gear ratio, regardless of the load on the shaft, characterized in that according to the SNO invention as a Converter gear ratio using the device, containing a planetary differential with leading planet carrier and different diameter Central toothed wheels, one of which is rigidly fixed on the output shaft of the transmission power of the engine to the output shaft, and the second is loaded on the leading portion of the friction device with a known force slippage that generates brake torque and regulatory ratio, while the driven part of the friction device rigidly connected with the third Central gear wheel freely rotatable on the output shaft, and which, through the gear transmits the rotation of the fourth gear wheel rigidly connected with the output shaft.



 

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