Reverse stepless gearbox

 

(57) Abstract:

The invention relates to mechanical engineering and can be used to create a continuously variable transmission vehicles. Reverse stepless gearbox contains the input and output mechanisms, transmission, connecting them, and a device for controlling gear ratio. Input and output mechanisms are made in the form of differential mechanisms, a pair of axes which are connected by a direct gear, the second reversible. The control unit gear ratio made in the form of two hydraulic gear pumps, shaft each of which is connected to one of the axes of the output of the differential mechanism. The input pipe of the pump connected to the reservoir with the working fluid, and output through an adjustable choke is also connected to the reservoir with the working fluid. Improved performance, simplified design of the gearbox. 1 Il.

The invention relates to mechanical engineering and can be used to create a continuously variable transmission vehicles.

Well-known gear switchable under load, containing lead and led by the gear [1].

A disadvantage of the known device is the design complexity due to the presence of a large number of coaxial shafts, gears and friction clutches, and not wide enough functionality, providing only a step change of speed of the driven shaft.

Closest to the claimed design features and achieve results is a device for torque transmission with variable gear ratio, taken as a prototype [2].

The device prototype contains the input and output mechanisms, primary and secondary power transmission, connected by a variable speed drive mechanism for the regulation of the ratio.

The disadvantage of this device is its complexity due to the presence of a large number of paired between the mechanisms that reduce the overall reliability of the device and is not high enough functionality that is not allowing the gear and reverse under load.

The problem to which the invention is directed, improving performance, simplifying the design and improving nadednoy and output mechanisms, transmission connecting them, a device for controlling gear ratio, unlike the prototype of the input and output mechanisms are made in the form of differential mechanisms, and a transmission connecting them to a single pair of axes made direct gear, the second reversible, the control unit gear ratio made in the form of two hydraulic gear pumps, shaft each of which is connected to one of the axes of the output of the differential mechanism, the input pipe of the pump connected to the reservoir with the working fluid, and the output is through an adjustable choke is also connected to the reservoir with the working fluid.

The drawing shows a diagram of the inventive device.

The input shaft 1 through a bevel gear 2 is connected to the Central wheel 3 input 4 differential, one axis of which is connected through gears 5 and 6 with the axis of the differential gear 7, the second axle differential 4 is connected through the gears 8 and 9 and parasitic gear 10 with the corresponding axle differential 7. Gears 5,6,8,9 and 10 constitute a transmission connecting the input and output differential mechanisms. To the axes of the differential gear 7 attached to the shaft of Chester what costu 16. Output pump nozzles through an adjustable throttle 15 is also connected to the reservoir 16. The differential gear 7 through the Central wheel 17 and the bevel gear 18 is connected with the output shaft 19.

The device operates as follows.

In the initial moment of time adjustable throttle 15 is fully open. The rotation of the input shaft 1 through the gear 2 is transmitted to the Central wheel 3 differential 4. The differential side shaft 4 begins to rotate the gear 5 and 8 in the same direction. Rotation through gears 6, 9 and 10 is transmitted to the differential 7, and the axis of the differential rotate in different directions, so the Central wheel 17, the gear 18 and the output shaft 19, the rotation is not transmitted. The pumps 11 and 12 rotate, pumping the working fluid without resistance. Using an adjustable throttle 15 overlapping the output of one of the pumps, such as pump 12. By increasing the flow resistance of the liquid at the outlet of the pump 12 increases the braking torque on its shaft, which reduces the speed of rotation of the gears 5 and 6 and the associated axes differentials 4 and 7.

At the same time by the same amount increases the speed of rotation of the gears 8 and 9 and their associated axes differentials 4 and 7. R is from 17, the gear 18 and the output shaft 19. Increasing the flow resistance of the working fluid from the pump 12 that is generated by the inductor 15, increases the speed of rotation of the output shaft 19. Upon full closure of the output fluid from the pump 12 associated axis differentials 4 and 7 are stopped, the rotation is transmitted through gears 8, 9 and 10, the rotation speed of the input 1 and output shaft 19 are equal.

Thus, by throttling the working fluid coming out of one of the pumps, it is possible to smoothly change gear ratio of the transmission from 0 to 1, and the direction of rotation of the output shaft can be changed without interrupting the kinematic connection of the input and output shafts.

For reversal of rotation of the output shaft 19 at a constant direction of rotation of the input shaft 1 through the throttle 15 to create a flow resistance at the outlet of the pump 11, and the speed of rotation of the output shaft 19 is proportional to the braking torque on the pump shaft 11.

The inventive device can be configured in the form of a housing with an oil bath, in which submerged all the mechanisms, and the oil is used for lubrication of moving parts, and is managed manually and with the help of the servo-mechanism, remotely. Possible control software.

In comparison with the known structures of the gears of the proposed technical solution has the following advantages:

- simple control gear, due to the fact that the change gear ratio of the device is sufficient to rotate the throttle valve;

- reverse and change speed is carried out without breaking the kinematic chain, which allows the regulation under load and improve reliability;

- the use of hydraulic pumps as braking devices can improve the life of the gearbox and to reduce wear, which improves operational quality gear.

Sources of information taken into account

1. Auth.St. The USSR 1160943, BI 21, 1985

2. Auth.St. The USSR 4767633, BI 25, 1975 - prototype.

Reverse stepless gearbox, containing input and output mechanisms, transmission, connecting them, a device for controlling gear ratio is characterized in that the input and output mechanisms are made in the form of differential mechanisms, and a transmission connecting them to a single pair of axes made pouch gear-type hydraulic pumps, the shaft of each of which is connected to one of the axes of the output of the differential mechanism, the input pipe of the pump connected to the reservoir with the working fluid, and output through an adjustable choke is also connected to the reservoir with the working fluid.

 

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