Converter of gear ratio

FIELD: machine building.

SUBSTANCE: converter of gear ratio of transmission consists of planetary differential with driving carrier (2) and two central gears (5, 6) different in diametre. One of central gears (5) transfers rotation to output shaft (7). Second central gear (6) transfers rotation via reducer (8) shifting direction of rotation and friction clutch (9), driven disk of which is rigidly coupled with the output shaft, also to output shaft (7). Both central gears rotate the output shaft in one direction, but have different speed of rotation. Difference of rotation speed is compensated with the friction clutch also distributing load between arms of the differential.

EFFECT: decreased losses and simplification of design.

3 cl, 1 dwg

 

The invention relates to the field of transport engineering and mechanisms, which are necessary in a wide range to change the gear ratio, optimizing the acceleration or deceleration of the output shaft. An example of such a mechanism may be a mechanism clutch and gearbox of the vehicle, traction mechanisms for the electric vehicle, the drive gear rotor helicopter or autogyro, lifting and towing mechanisms, tools with variable gear ratio, such as a wrench or screwdriver, starter fans, centrifuges, controls the speed of pumps, blowers, exhaust devices and others, need to change the gear ratio of the transmission at the regulated load on the motor shaft.

There are various ways of matching gear ratio in the transmission of motion from the motor to the actuator. The most common way is the gear reducer. In the car to accelerate use "grip" is a friction clutch. These mechanisms are described, for example, in II Artobolevsky I.I. "Mechanisms in modern engineering", Volume 4 "gears" and 5 "Friction mechanisms. Moscow. Science 1980, and in "Converter gear ratio, regardless of the load on the shaft, Patent RU No. 2304735 and "Reg is the centre of the engine speed of the vehicle with the Converter gear ratio of the transmission, regardless of the load on the output shaft, Patent RU No. 2333405.

The lack of gears is that when using the gear ratio of the transmission is constant, the engine in most cases does not work at its optimum level, thus deteriorating the efficiency, increase the load on the engine and the transmission elements. Introduction in the design of technologically complex devices, a stepped or stepless converters gear ratio, as well as special devices, such as hydraulic motors, the drive rotor autogyro, leads to a higher cost structure and reduce reliability. In the car, in the beginning of the movement, when the clutch large proportion of energy spent on engine friction, and acceleration is also not in the optimal mode. The disadvantages of the known solutions described in Patent RU No. 2304735 and Patent RU No. 2333405, are the complexity of the design and optimal operation mode in the conversion process ratio.

The objective of the invention is the implementation of simple and optimal working of the mechanism for acceleration or deceleration of the output shaft with automatic change gear ratio when the engine is in the process of acceleration at a constant optimum mode. This will lead to the reduction of losses and simplification of the structure.

this goal is achieved by according to the invention, as a Converter gear ratio of the transmission using a planetary differential with leading planet carrier and two different diameter Central wheels. Satellites located on the drive rod, rigidly interconnected, obkatyvalisj two Central wheels. One of the Central wheel is rigidly connected with the output shaft, and the second Central wheel through the gear changes the direction of the rotation performed by any known method, transmits rotation to the disk friction clutch, second disk which is rigidly connected with the output shaft. The difference in the rotation is compensated by a friction clutch, which also distributes the load between the shoulders of the differential. Both discs of the friction clutch to rotate in one direction. Friction in the friction clutch makes unwind the entire mechanism and gear ratio decreases from the maximum value when the motion is transmitted only through the gears of the planetary gear unit to unit, when the rotation of the gears is missing, and the whole mechanism rotates as a whole. On the shaft of the engine load is constant and is determined by the magnitude of the friction force between the discs of the friction clutch, which is also based on the need, for example with changes in engine power can force change.

Image is eenie illustrated in the drawing, which shows schematically the planetary differential transmission of rotation to the output shaft and the friction clutch. According to the invention, the rotation from the drive shaft 1 is transmitted to the carrier 2. On the drive rod to freely rotate a pair of satellites 3 and 4, rigidly interconnected. The satellite 3 is connected to the Central wheel 5, which is rigidly connected with the output shaft 7. The satellite 4 is connected with the Central toothed wheel 6, freely rotating on the shaft. The Central gear wheel 6 through a gear 8 which changes the direction of rotation, the axis of which is located on the output shaft, perpendicular rigidly connected with the drive friction clutch 9. The clutch disc friction clutch 10 is rigidly connected with the output shaft 7. Thus, when rotating drove satellites will roll along the Central wheels and "push" them by an amount proportional to the difference of the ratios of the diameters of the Central pairs of wheels and satellites. But the rotation of the wheel 6, due to the presence in the kinematic chain gear 8, to change the direction of rotation, and both Central wheel will rotate the output shaft 7 in one direction: the wheel 5 directly, and the wheel 6 through the gear, changing the direction of rotation and the friction coupling, both discs which rotate in the same direction. During acceleration, at the beginning of the motion when the motion is transmitted through the gear differe the capacity, its final drive ratio will be greater, the smaller the difference between the ratio of the diameters of the pairs of the Central gears and satellites. At the end of the acceleration slippage in the friction clutch no, the satellites and the Central gear fixed relative to each other and the whole mechanism rotates as a whole, and its final drive ratio is equal to unity. If you increase the required torque at the output shaft of the satellites will start our teams in the Central gear wheels, and there will be slippage in the friction clutch, gear ratio will increase to the desired value, the corresponding value of torque generated by the engine and the required torque. In some mechanisms, for example in the transmission of the vehicle or the electric vehicle, the change of the friction force in the friction clutch may be used to maintain the speed of the motor constant to the extent possible, regulation, changing the ratio of its power and the power required for propulsion. In this case, the compression force of the friction disks of the clutch should be a function of engine speed. The power regulator disk compression of the friction clutch can be performed by any known method, such as manual, mechanical, centrifugal, hydraulic, Electromechanical, electronic. The gear changing nab is providing rotation of one of the Central wheels can also be performed by any known method.

1. Converter gear ratio, characterized in that as a Converter gear ratio of the transmission using a planetary differential with leading planet carrier and two different diameter Central wheels, one of which transmits rotation to the output shaft, and the second Central wheel transmits rotation through the gear changes the direction of the rotation performed by any known method in the disk friction clutch, second disk which is rigidly connected with the output shaft.

2. Converter gear ratio according to claim 1, characterized in that both the Central wheel planetary differential rotate the output shaft in one direction, and the difference of rotation of the Central wheel is compensated by a friction clutch, which also distributes the load between the shoulders differential.

3. Converter gear ratio according to claim 1, characterized in that the force of friction in the friction clutch, both discs which rotate in the same direction but with different speeds, makes us unfold the whole mechanism and gear ratio is changed from the maximum value when the motion is transmitted only through the gears of the planetary gear unit to unit, when the rotation of the gears is missing and the whole mechanism the sm revolves entirely.



 

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