Gear variator

FIELD: engines and pumps.

SUBSTANCE: invention refers to devices for stepless converters of torque and rotary motion. A gear variator contains two differential mechanisms (1, 2), two reducers (3, 4) with different ratios. One of the shafts of each reducer is connected to a hydro pump (11) equipped with an adjustable valve. Two differential mechanisms and two reducers are arranged so that input shafts of the reducers are at the same time half axes of the first differential mechanism, while output shafts of reducers are half axes of the second differential mechanism. The differential allows distribution of rotation between half axes within range from zero to a speed of a drive shaft on one of the half axes which corresponds to interval from the speed of the drive shaft to zero on the other half axis. A rotation speed of the variator driven shaft can be adjusted by means of adjustable valves through which liquid is pumped by gear oil pumps driven with specified shafts of the mechanism.

EFFECT: variator allows to change value of torque within any given range.

2 dwg

 

The device selected as the prototype described in the application EPO(EP) No. 272461 from 88.06.29 No. 26. It consists of a differential transmission, forming a mechanical part and a hydraulic part, containing the elements of the hydrostatic transmission. The disadvantages of this variator - all the disadvantages of the hydrostatic transmission, i.e. the complexity, high cost of hydraulic pumps and motors with variable volumes, etc.

The present invention is a gear mechanism that is capable of steplessly changing the speed of the transmitted rotation and torque transmission in the required range. In the mechanism of flexible elements, friction, power transmission liquid bodies.

At the core of his work is the property of the differential mechanism that is capable of steplessly changing the speed of rotation of its shaft.

Gear variator consists of (see figure 1, 2):

1, 2 - differential mechanisms

3 - reducer maximum gear ratio of the variator,

4 - reducer minimum transmission ratio of the variator,

5 - drive shaft of the variator,

6, 7, 8, 9 intermediate shafts,

10 is the driven shaft of the variator,

11, 12 - gear pumps.

Dotted lines indicate mechanical coupling of pump shafts.

Components of the variator are as follows: the input in the crystals gearboxes are the axes of the first differential the output shafts of the gearboxes are the semi-axes of the second differential. The gear ratio of the variator 3 is the maximum ratio of the variator.

The gear ratio of the reduction gear 4, which may be less than the units is the minimum transmission ratio of the variator. Property of the differential mechanism allows the transfer of power through each gear individually, and through both of the gearbox at the same time in different proportions, with appropriate adjustment of the distribution.

At the same time we continuously change the rotation speed of the driven shaft in the range fromto

where ω5- the speed of rotation of the driving shaft 5, Umaxand Umin- the gear ratio of the gears 3 and 4.

The variator works as follows.

The shaft 5 receives the rotation from the engine. To the shaft 10 is applied the moment, which prevents its rotation. At the time of start of the engine (starting the car) the greatest resistance, the pump 11 does not prevent the rotation of the shaft 6 and all of the rotating elements of the gearbox 3, all transmitted power will follow the line of least resistance through the reduction gear 3. Thus the gear ratio of the variator, i.e. the ratio of the speeds of rotation of the shaft 5 and the shaft 10 will be equal to the transmission number of the gearbox 3. As R is Shona mechanism (car) resistance to rotation of the shaft 10 is reduced, it allows to increase the gear ratio of the variator, which is achieved by reducing the cross-section of an adjustable valve, through which pumps the fluid pump 11. This leads to the transfer of power through the gear 4. Further reduction of the moment of resistance to rotation of the shaft 10 and deceleration of the pump 11 increases the amount of power transmitted through the reduction gear 4, and with the full stop of the gearbox 3 all power is transmitted through the reduction gear 4, the gear ratio of the variator is equal to the transmission number of the gearbox 4.

Thus this variable allows stepless change gear ratio of the maximum to the minimum, and as the brake release pump 11 in the reverse order.

The pump 12 performs an additional function, namely, when the transmission becomes the driving member, and a motor driven that occurs during braking of the vehicle engine, allows you to adjust the intensity of this inhibition.

To ensure the vehicle is in motion reversing gear 3 must be neutral and reverse, the inclusion of which is interlocked with the full opening of the valve of the pump 11. With this design of the gearbox 3 is probably long separation of engine and transmission, constant high gear ratio of the variator when driving the car the La reverse.

Gear variator, characterized in that it contains the second differential mechanism, two gears with different gear ratios, one of the shafts of each gear is connected with a hydraulic pump with an adjustable valve, and two differential mechanism and two reducer are arranged so that the input shafts of the gearboxes are the axes of the first differential mechanism, the output shafts of the gearboxes are the semi-axes of the second differential mechanism.



 

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FIELD: mechanical engineering.

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EFFECT: enhanced efficiency.

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Gear variator // 2325570

FIELD: engines and pumps.

SUBSTANCE: invention refers to devices for stepless converters of torque and rotary motion. A gear variator contains two differential mechanisms (1, 2), two reducers (3, 4) with different ratios. One of the shafts of each reducer is connected to a hydro pump (11) equipped with an adjustable valve. Two differential mechanisms and two reducers are arranged so that input shafts of the reducers are at the same time half axes of the first differential mechanism, while output shafts of reducers are half axes of the second differential mechanism. The differential allows distribution of rotation between half axes within range from zero to a speed of a drive shaft on one of the half axes which corresponds to interval from the speed of the drive shaft to zero on the other half axis. A rotation speed of the variator driven shaft can be adjusted by means of adjustable valves through which liquid is pumped by gear oil pumps driven with specified shafts of the mechanism.

EFFECT: variator allows to change value of torque within any given range.

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FIELD: engines and pumps.

SUBSTANCE: invention relates to a hydromechanical transmission incorporating a split mechanical and hydrostatic drives and is designed to be used in agricultural tractors. The hydromechanical four-gear infinitely-variable transmission incorporates planetary mechanism (32) including three planetary trains (34, 36, 38), four clutches (C1, C2, C3, C4) and brake (48) to throw in reverse. First hydrostatic assembly (20) is in mesh with planetary mechanism second crown gear (R2). In the First and Fourth gears, second hydrostatic assembly (18) is in mesh with carrier (28) thrown in by first clutch (C1). In the Second and Third gears, second hydrostatic assembly is thrown into mesh with sun gear (S2) of the planetary mechanism second train by second clutch (C2). In the First and Second gears third clutch (C3) meshes carrier (28) with output shaft (46). In the Third and Fourth gears, fourth clutch (C4) meshes sun gear (S2) of the second planetary train with output shaft (46). Third planetary train (38) incorporates brake (48) to throw in reverse. When brake (48) meshes to throw in reverse and both clutches, third and fourth, (C3, C4), are disengaged, third train sun gear (S3) and, hence, transmission output shaft (46) runs reverse.

EFFECT: infinitely-variable transmission with steady efficiency in operating conditions.

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FIELD: machine building.

SUBSTANCE: hydro-automatic output control gear incorporates input shaft 1 and output shafts 3, 4 coupled with propulsion unit and inter-jointed by differential 2, its output elements being coupled with pumps 10, 11 be planetary drive of hydraulic control system. Pumps 10, 11 communicate, via control valve 17, with common fluid flow rate control valve driven by both aforesaid output elements. Aforesaid control valve 17 is articulated to steering drive worm 18.

EFFECT: improved vehicle propulsion performances, better steering, longer life of propulsion unit due to automatic shut-off of fluid flow rate control valve.

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