System of automatic transmission control

FIELD: machine building.

SUBSTANCE: invention is related to the field of motor transport machine building. System of automatic transmission control comprises pump, hydraulic distributor of modes having three positions, slide type pressure controller, hydraulic distributors of transmissions, pump filter, distributor filter, lubricating throttle, heat exchanger. In the first position hydraulic distributor of modes connects forward manifold and backward manifold to drain cavity. In the second position hydraulic distributor of modes connects forward manifold to the main manifold, and backward manifold to drain cavity. In the third position hydraulic distributor of modes connects forward manifold and backward manifold to the main manifold. Hydraulic distributors of transmissions are arranged as electromagnetic, and supply power fluid via control manifold to hydraulic cylinders of transmission control elements. Slide type pressure controller comprises stem with two pistons - left and right - that separate the stem into three sections. Pump filter is installed in supply channel between drain and controller drain channel. Distributor filter is installed in main manifold between pump and hydraulic distributor of modes. Lubricating throttle is installed in lubricating manifold, through which liquid is supplied to lubrication system. Heat exchanger is installed between lubricating system and lubricating throttle.

EFFECT: higher reliability of automatic transmission.

2 cl, 2 dwg

 

The invention relates to the field of transport engineering and for the design of elements of the stage planetary gearbox, which can be used in automatic transmissions, managed with the help of electronic unit and hydraulics, and intended for vehicles.

Part automatic transmission typically includes a hydrodynamic torque Converter (torque Converter), in which the kinetic energy of the working fluid is used to transfer torque from the engine crankshaft to the input element of the transmission. It is, as a rule, transmission of the planetary type, providing the change of torque on the propulsion and speed. Transmission of the planetary type consists of planetary gear sets and friction controls. Friction controls on your purpose can be divided into two groups: brakes and clutches. A friction clutch connecting the elements of the planetary mechanism between them. Friction brakes combine elements of the planetary mechanism with the transmission housing. To shift the working fluid (oil) from the pump through the valve system is brought to the Executive controls the friction brakes and friction clutches. Oil the ASAS, the transmission housing, valves, sump (oil tank), valves, filters, heat exchangers, connecting channels (trunks) and a device that converts hydraulic energy into mechanical energy, together constitute the hydraulic control system of the planetary gearbox. Such a system typically provides and manages the processes start, gear, lubricating the working nodes, cooling and cleaning fluid.

The use of planetary gearboxes type in automatic transmissions of vehicles due to the possibility of obtaining a small-sized compact layout design, easy to fit in the limited dimensions of the body space.

Currently, such commercially available automatic transmissions as Chrysler 42LE, 45RFE, Peugeot AL4 for the shift control is responsible electrohydraulically control system, made as a separate unit and distributing the working fluid through a system of valves depending on the traffic channels in the corresponding friction controls, where the pressure of the working fluid is converted into mechanical force required to activate them. The pressure in an electrohydraulic control system of the transmission systems of its lubrication and control is to be placed is provided with an oil pump, located between the hydrodynamic torque Converter (torque Converter and transmission. The oil pump can be either a constant or variable performance.

However, such hydraulic systems do not provide management with the required high precision, especially in the construction of the transmission, not containing the torque Converter, when the starting of the vehicle is carried out by skidding of one of the controls, therefore, cannot provide the high reliability of transmission, contain bulky accumulators, resulting requirements to the pump and its performance increase, which leads to low efficiency of such transmissions.

The present invention is directed to the solution of the technical problem to improve the characteristics of the vehicle, to improve the comfort of movement, increasing the reliability of an automatic transmission.

Achievable technical result is to increase the accuracy of pressure control and processes start and gear shift in the transmission, and consequently, increase reliability, reduce vibrational loads on parts of the transmission in the process of switching gears and also to minimize the amount of hydraulic controls, in exception with the bulky volumes of accumulators, reducing the pump output.

This technical result is achieved in that the control system of an automatic transmission includes a pump, of the working fluid from the transmission housing, which cavity drain, via a supply channel and forcing it under pressure into the main thoroughfare associated with the valve operating modes of the transmission, in which

valve modes having three positions, the first of which valve modes connects the front line of the course and the highway to the rear with a cavity drain, the second valve modes connects the front line of the turn from the main highway, and the highway to the rear with a cavity drain, the third valve modes connects the front line of the stroke and the line rear with the main highway,

the front line of stroke associated with proportional valves transmission, through which the control line serves the working fluid in the hydraulic cylinders control the forward progress of the transmission, in which

each of the valves transmission having two positions, the first of which the valve gear connects the control line with a cavity drain, the second valve transmission svyazyvayushchuyu line with the main highway, and made electromagnetic feedback pressure in the control line,

highway reversing connected through a throttle reverse with hydraulic control reversing transmission,

the pressure regulator spool type, designed to regulate the pressure in the main thoroughfare and controlling the flow of fluid entering the lubrication system, consisting of a rod on which the piston, left and right, dividing the rod into three parts installed in the cylindrical body of the valve, forming, thus, left, right and middle of the cavity, the spring installed in the left cavity, an additional cavity formed by the right end of the rod, and a horizontal blind hole made in the body of the valve on the right side, where the left piston is cylindrical, and the right piston has a curved concave generatrix forming with the cylindrical surface of the housing of the regulating valve cavity, and two cavity feed, left and right, made the grooves in the body of the valve so that the rightmost position of the valve, the left piston completely covers the left cavity of the feeder, and the right cavity of the feeder is located between the left and right pistons

in which the right cavity of filing and additional cavity associated with the main what aistralia, regulatory cavity is connected with the drain channel controller associated with the feed channel, the left cavity of the feeder is connected to the main lubrication, right cavity associated with the control channel and through the throttle control to the main line, and a drain valve having two positions, in the first position, the drain valve connects the control channel with channel drain regulator, and in the second position does not bind, and made electromagnetic,

includes filter pump installed in a feed channel between the drain and the channel drain regulator, a filter distributor, mounted in the main thoroughfare between the pump and valve modes, throttle lubrication, installed in the main line of grease through which the fluid enters the lubrication system, in which between the lubrication system and the throttle lubrication has a heat exchanger for cooling the working fluid from the lubrication system the working fluid is supplied into the cavity drain.

These characteristics are essential and interrelated with the formation of a stable set of essential features, sufficient to obtain the desired technical result.

Equipment the main highway and railroad grease relief valves has improved the reliability of the control system.

This is the invention is illustrated by a concrete example, which, however, is not only possible, but clearly demonstrates the possibility of achieving the desired technical result is given by a set of attributes.

The essence of the proposed technical solution is illustrated by drawings, where

figure 1 is a hydraulic circuit diagram of the control system;

figure 2 - pressure regulator control system.

According to the present invention the control system of an automatic transmission includes a pump, of the working fluid from the transmission housing, which cavity drain, via a supply channel and forcing it under pressure into the main thoroughfare associated with the valve operating modes of the transmission, in which

valve modes having three positions, the first of which valve modes connects the front line of the course and the highway to the rear with a cavity drain, the second valve modes connects the front line of the turn from the main highway, and the highway to the rear with a cavity drain, the third valve modes connects the front line of the stroke and the line rear with the main highway,

the front line of stroke associated with proportional valves transmission, through which the control line serves working W is dcost in the cylinders controls the forward progress of the transmission, in which

each of the valves transmission having two positions, the first of which the valve gear connects the control line with a cavity drain, the second valve transmission connects the control line to a main highway, and made electromagnetic feedback pressure in the control line,

highway reversing connected through a throttle reverse with hydraulic control reversing transmission,

the pressure regulator spool type, designed to regulate the pressure in the main thoroughfare and controlling the flow of fluid entering the lubrication system, consisting of a rod on which the piston, left and right, dividing the rod into three parts installed in the cylindrical body of the valve, forming, thus, left, right and middle of the cavity, the spring installed in the left cavity, an additional cavity formed by the right end of the rod, and a horizontal blind hole made in the body of the valve on the right side, where the left piston is cylindrical, and the right piston has a curved concave generatrix forming with the cylindrical surface of the housing of the regulating valve cavity, and two cavity feed, left and right, made protack the mi in the body of the valve so that in the rightmost position of the valve, the left piston completely covers the left cavity of the feeder, and the right cavity of the feeder is located between the left and right pistons

in which the right cavity of filing and additional cavity connected with the main highway governing the cavity is connected with the drain channel controller associated with the feed channel, the left cavity of the feeder is connected to the main lubrication, right cavity associated with the control channel and through the throttle control to the main line, and a drain valve having two positions, in the first position, the drain valve connects the control channel with channel drain regulator, and in the second position does not bind, and made electromagnetic,

includes filter pump installed in a feed channel between the drain and the channel drain regulator, a filter distributor, mounted in the main thoroughfare between the pump and valve modes, throttle lubrication, installed in the main line of grease through which the fluid enters the lubrication system, in which between the lubrication system and the throttle lubrication has a heat exchanger for cooling the working fluid from the lubrication system the working fluid is supplied into the cavity drain.

To improve the reliability according to the first example implementation of a control system in the main mage is stral and highway lubrication can be equipped with safety valves.

The following is an example of a specific implementation of the control system.

The control system of an automatic transmission includes a pump 2, of the working fluid from the transmission housing 1, which is a cavity drain, via a supply channel 3 and pumps it under pressure in the main line 4 associated with the valve operating modes of the transmission 5.

Valve modes 5 has three positions, the first position of the valve modes 5 connects the front line of turn 6 and highway reversing 7 with a cavity drain 1, in the second - line forward stroke 6 with the main highway 4 and highway reversing 7 with a cavity drain 1, in the third - line forward stroke 6 and highway reversing 7 with the main highway 4.

Highway front stroke 6 is associated with proportional valves gear 8A 8E..., each of which is connected through a suitable control line 9a...9D with hydraulic cylinders control the forward progress of the transmission 10A 10D....

Each of the valves gear 8A 8E...has two positions, in the first position, the valve gear 8 connects the control pipe 9 with a cavity drain 1, the second control line 9 to a main highway 4. Valves gear 8A 8E...electromagnetic, back with the feedback pressure in the corresponding control line 9a...D.

Highway reverse gear 7 through a throttle reverse gear 11 is connected with the hydraulic cylinder control reversing transmission 12.

Spool of the pressure regulator 13 is designed to control the pressure in the main line 4 and controlling the flow of fluid entering the lubrication system 39. The pressure regulator 13 is composed of a rod 14, which is made of two pistons, left 15 and right 16 that divides the rod 14 into three parts. The rod 13 is installed in the cylindrical body of the spool 17 and forms, therefore, left 18 right 19 and the average cavity 20. The spring 21 is installed in the left cavity 18. Additional cavity 22 formed by the right end 23 of the rod 14 and the horizontal blind hole 24 made in the body of the slide valve 17 on the right side. The left piston 15 is cylindrical. The right piston 16 has a curved concave generatrix 25 forming with the cylindrical surface of the housing of the slide valve 17 regulates the cavity 26. Two oral submission, 27 left and right 28 performed by the grooves in the housing of the slide valve 17 so that the rightmost position of the left valve piston 15 completely covers the left cavity of the feeder 27 and the right cavity of the feeder 28 is located between the left 15 and right pistons 16.

The right cavity of the feeder 28 and the additional cavity 22 are connected with the main highway 4. Regulatory cavity 26 is connected the channel drain regulator 29. The drain channel controller associated with the feed channel 3. The left cavity of the feeder 27 is connected to the main lubricant 30. The right cavity 28 is connected with the control channel 31 and through a throttle regulation 32 with the main highway 4.

Electromagnetic drain valve 33 has two positions, in the first position, the drain valve 33 connects the control channel 31 channel drain regulator 29 and the second does not bind.

The filter pump 34 is installed in a feed channel 4 between the drain 1 and drain channel controller 29. The filter valve 35 is installed in the main line 4 between the pump 2 and valve modes 5.

Choke lubricant 37 is installed in the trunk of the lubricant 30. In the lubrication system 39 the liquid flows through line lubricant 30. Between the lubrication system 30 and the throttle lubricant 37 is installed, the heat exchanger 38 for cooling the working fluid. Of the lubrication system 30, the working fluid enters the cavity drain 1.

If the main line and the lubrication system to install safety valves, it is possible to obtain a control system, protected from excess pressure in the arteries, increasing thereby its reliability.

Proposed according to the invention, the control system operates as follows.

When the engine is restarted the vehicle and it will idle Residencial to rotate the drive shaft of the pump 2. The working fluid from the cavity drain 1 through purifying it from the products of wear of the filter pump 34 is pumped to the feed channel 3 and injected into the main line 4. Valve modes 5 is in the first position, linking, thus, the front line of turn 6 and highway reversing 7 with a cavity drain 1, that is, the main road from the side of the valve modes is closed. This corresponds to the neutral mode of the transmission, none of the controls transmission is not enabled. Also operated unloading valves gear 8A 8E..., that is draining the hydraulic cylinders control the forward stroke 10A...d into the cavity drain 1. With such design, in the neutral mode of the transmission eliminates the accidental inclusion of transmission, for example in case of contact with the valves gear 8A...d spurious electrical signals. Fluid from the main line 4 is fed into the left cavity of the feeder 27 and the right chamber 19 of the pressure regulator 13. After filling the system to the main line 4 is set to some first pressure value at which the force of the spring 21 is balanced by the force of fluid pressure in the cavities of the pressure regulator 13, that is, the rod 14 is displaced to the left and has a definite position relative to the housing, Zoloti is 17. The first pressure is selected so that the left piston 15 opens the left cavity of the feeder 27, connecting it with the average cavity 20, and the right cavity of the feeder 28 is between the left 15 and right pistons 16. In this case, through the gap formed between the cavities 27 and 20 has some desired flow of the working fluid entering the highway grease 30 from the main highway 4.

The drain valve 33 is in the first position, connecting the control channel 31 channel drain regulator 29. Thus, the fluid flowing in the right cavity 19 of the main highway 4 through the reactor regulation 32, is under pressure from the line supply 3, which is connected to the drain channel controller 29. Resistance control throttle 32 is selected so that the amount of liquid grossulariae through it is negligible in relation to the flow rate of the pump. On the highway grease 30 fluid through the throttle lubrication 37 comes into the cooler 30 where it is cooled, and later in the lubrication system 39, which represents the hydraulic system that distributes the working fluid on all lubricated components and gearbox parts. Of the lubrication system 39 the working fluid is supplied into the cavity drain 1. Thus, the prevailing part supplied by a pump 2 fluid enters the lubrication system 30, and the rest of the red part through the throttle regulation 32 is returned to the feed channel 3.

When the vehicle is moving forward valve modes takes the second position, connecting the front line of turn 6 with the main highway 4. The liquid fills the front line of turn 6 and the pressure in the main line 4 and line a forward stroke 6 become equal. To effect the movement and shift necessary in accordance with the kinematic scheme of a transmission selectively enable and disable controls based on the actions of the driver and the operating conditions of the vehicle. The inclusion of the control means filling the hydraulic fluid, creating and maintaining the pressure in the hydraulic control transmission 10A 10D...at a certain level within the required period of time. When this signal electronic control valves gear 8A 8E...selectively connect the control line 9a...9D with the main highway 4, thereby filling the cylinders controls the forward stroke 10A...d, that is, increasing the pressure of fluid in them, or selectively connect the control line 9 with a cavity drain 1, thereby reducing the fluid pressure, either by turning off the controls transmission. Electromagnetic valves re the Ah 8A 8E...feedback pressure allows you to adjust the pressure in the control line 8A 8E...and in the related cylinder 10A...d depending on the supplied electric signal. This allows you to smoothly fill the cylinders controls 10A...d, providing, respectively, the smooth integration of controls transmission, thereby increasing the comfort of movement. Or you can use the controls to ensure the driving of the vehicle.

When the vehicle is moving backward, the valve modes takes the third position, connecting the front line of turn 6 and highway reversing 7 with the main highway 4. The liquid fills the front line of turn 6, line reverse gear 7, and the pressure in these arteries and highways of the front stroke 6 become equal. For the implementation of inclusion reverse gear according to the kinematic diagram of the gear necessary to include some of the controls forward course that is similar to the inclusion of these elements when driving the vehicle forward. Along with this fluid fills the cylinder control reverse gear 12 through the throttle reversing 11, allowing the inclusion of control reversing 12 smooth, by creating additional resistance to the flow of the working fluid in the main line reverse 7. In line reversing 7 there is no valve, since the control is adnego move in the reverse mode must be enabled permanently.

When you increase the engine speed increases, the flow in the pump 2 and, accordingly, increases the pressure in the entire system of control, which can lead to additional losses, reduce efficiency, increase the load on the elements and thereby reduce the durability. On the other hand, in accordance with the characteristics of kinematic schemes of planetary gearboxes desired main pressure line 4 is different for different transmission. As a rule, to a lower gear to the desired main pressure line 4 several times higher compared to the pressure required at the highest gear. Therefore, the pressure can be maintained at the same level throughout the cycle of movement of the vehicle is impractical from the point of view of energy consumption. Therefore, in the control system applied a two-stage pressure regulator 13, which allows starting with a certain value of the flow rate of the pump 2 to establish and maintain the pressure in the main line 4-level selectively one or the other of fixed size.

The pressure controller 13 operates as follows. When the engine is running, when the speed is less than the idle speed, the pressure regulator 13 is in the initial state, i.e. the left cavity of the supply covered by the left piston 15, and the right cavity of the feeder 27 is located between the left 15 and right pistons 16. Gidroraspredeliteli the eh drain 33 is in the first position, linking the control channel 31 channel drain regulator 29. The feed pump 2 is spent on its internal leaks (little leaks are present in the pressure regulator 13). The pressure pump 2 in this case is determined not by the pressure regulator 13, and the resistance of the clearances of the pump 2.

At idle engine speeds, the pump 2 is a flow in which the pressure of fluid in the additional cavity 22, counteracting the spring 21 moves the rod 14 of the pressure regulator 13, opening the gap between the left piston 15 and the right cavity of the feeder 28. Directing, thereby, the portion of the working fluid from the main highway 4 in the lubrication system 39. The pressure maintained by the pressure regulator 13 is stable. When the supply pump 2 is sufficient for the implementation of the procedure of filling of the hydraulic cylinder control in accordance with the kinematic scheme of the transmission.

With the further growth of revolutions of the pump 2 excess supply causes an increase in pressure in the main line 4, thus, the pressure force in the additional cavity 22, counteracting the spring 13, shift rod 14, opening the gap between the right cavity of the feeder 27 and the regulating cavity 26. Part of the liquid flows into the drain channel controller 29, thereby reducing the pressure in the main thoroughfare. Further increase of the feed pump 2 is even more peredachku fluid cher the C cavity regulation 26 in the drain channel controller 29. And a curved concave forming 25 the right of the piston 16 is chosen so that for any value of the supply pump 2, the pressure in the main line remains at the same deliberately designed level.

As described above, the pressure controller 13 allows you to keep up the pressure in the main line at two levels selectively. At the signal, the electronic control of the drain valve 33 moves into its second position and the right cavity 19 ceases to be associated with channel drain regulator 29. Thus, the pressure in this cavity is the main pressure line 4 and the reaction force of the spring 21 additional pressure cavity 22 is formed with a force of pressure in the right cavity 19. This causes even greater displacement of the rod 14 and increases the gap between the right cavity of the feeder 27 and the regulating cavity 26. The pressure supported by the pressure regulator 13 in the main line 4 is reduced, thereby regulating the pressure level in the main highway 4 between the two estimated values in the process of shifting.

The present invention allows transmissions to organize reliable and accurate process control hill start assist, gear, lubricating the working nodes, cooling and cleaning fluid.

The present invention Ave is applicable industrial, since its implementation does not require special new technology and special equipment, except those used in mechanical engineering in the production of pumps, units pneumo and gearboxes including planetary.

1. The control system of an automatic transmission, comprising a pump, of the working fluid from the transmission housing, which cavity drain, via a supply channel and forcing it under pressure into the main thoroughfare associated with the valve operating modes of the transmission, in which the valve regimes has three positions, the first of which valve modes connects the front line of the course and the highway to the rear with a cavity drain, the second valve modes connects the front line of the turn from the main highway, and the highway to the rear with a cavity drain, the third valve modes connects the front line of the stroke and the line rear with the main highway, highway front stroke associated with proportional valves transmission, through which the control line serves the working fluid in the hydraulic cylinders control the forward progress of the transmission, in which each of the valves transmission has two positions, in the first of the which the valve gear connects the control line with a cavity drain, in the second valve transmission connects the control line to a main highway, and made electromagnetic feedback pressure in the control line, the line reversing connected through a throttle reverse with hydraulic control reversing transmission, the pressure regulator spool type, designed to regulate the pressure in the main thoroughfare and controlling the flow of fluid entering the lubrication system, consisting of a rod on which the piston, left and right, dividing the rod into three parts installed in the cylindrical body of the valve, forming, thus, left, right and middle cavity, a spring installed in the left cavity, an additional cavity formed by the right end of the rod, and a horizontal blind hole made in the body of the valve on the right side, where the left piston is cylindrical, and the right piston has a curved concave generatrix forming with the cylindrical surface of the housing of the regulating valve cavity, and two cavity feed, left and right, made the grooves in the body of the valve so that the rightmost position of the valve, the left piston completely covers the left cavity of the feeder, and the right cavity of the feeder is located between the left and right on sname, in which the right cavity of filing and additional cavity connected with the main highway governing the cavity is connected with the drain channel controller associated with the feed channel, the left cavity of the feeder is connected to the main lubrication, right cavity associated with the control channel and through the throttle control to the main line, and a drain valve having two positions, in the first position, the drain valve connects the control channel with channel drain regulator, and in the second position does not bind, and made electromagnetic, including the filter pump installed in a feed channel between the drain and the channel drain regulator, a filter distributor, established in the main thoroughfare between the pump and valve modes, throttle lubrication, installed in the main line of grease through which the fluid enters the lubrication system, in which between the lubrication system and the throttle lubrication has a heat exchanger for cooling the working fluid from the lubrication system the working fluid is supplied into the cavity drain.

2. The control system of an automatic transmission according to claim 1, characterized in that the main highway and railroad lubrication equipped with safety valves.



 

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EFFECT: simplified design and reduced weight.

1 cl, 5 dwg

FIELD: transport engineering.

SUBSTANCE: invention can be used in wide range of vehicles, for instance, in minicars or trucks, snow movers, carts used when playing golf, cross country cars and scooters. Proposed driving pulley contains two centrifugal mechanisms, namely, positive unit and negative unit. Both units contains corresponding group of flyweights exposed to action of centrifugal force at rotation of driving pulley. Positive unit is used as standard speed governor which shifts one of two flanges of driving pulley towards other flange to increase diameter of running-over-over of driving pulley when speed rises. Negative unit is used to apply opposite force of positive unit when speed of rotation exceeds threshold value to delay rise of ratio of steplessly adjustable drive to higher ratio under action of positive unit. It provides maintenance of high speed of rotation at intensive acceleration and slow speed of rotation at slow speeds of vehicle.

EFFECT: provision of additional control over entire range of change of ratio of steplessly adjustable drive to decrease force created by centrifugal system of driving pulley.

12 cl, 6 dwg

FIELD: mechanical engineering.

SUBSTANCE: method comprises changing transformation ratio by changing viscosity of fluid in the working space by changing voltage. The working space is defined by the spaces of blade rims of the reactor wheels. The voltage is supplied to the windings which generate magnetic field whose vector of magnetic induction generates magnetic viscosity in the fluid. The fluid is made of a magnetic liquid.

EFFECT: simplified method of control.

1 dwg

FIELD: transport mechanical engineering.

SUBSTANCE: device comprises electric means for measuring working volume of pumps and hydraulic motors and pickup (60) for measuring the speed of rotation of the shaft of the pump station. The electric circuits are provided with threshold control members (67) and (80) interconnected between pickup (6) and the electric means. Between threshold control members (67) and (80) and electric means for changing working volume of pumps (67) and (80) and hydraulic motors (13), (14), (17), and (18) of the drive of end wheels are variable resistors (77), (78), (86), and (87) that are controlled by pickups (89) and (89) of pressure difference in hydraulic circuits of the drive of the intermediate wheels and the drive of each pair of end wheels.

EFFECT: enhanced reliability and prolonged service life.

3 cl, 4 dwg

FIELD: transport mechanical engineering.

SUBSTANCE: system comprises electric means for changing working volumes of pumps and hydraulic motors and pickup (60) of the speed of rotation of the shaft of the pumping station. The electric circuit has variable resistor (61) and switch (62) interconnected between pickup (60) and electric means (40-45) and controlled by pedal (63) for supplying fuel to the engine, resistor (64) connected in parallel to the switch, and threshold control unit (67). The electric circuit also has threshold control unit (80) interconnected between the pickup and electric means (54-59), with the threshold being controlled by pedal (63).

EFFECT: improved quality of control.

3 cl, 4 dwg

FIELD: mechanical engineering.

SUBSTANCE: variator comprises rotating driving member (69), at least three power controllers, bearing member (18) for the friction contact with each of the power controllers, at least one platform (13a) and (13c), at least one unmovable base (5a) and (5c), and a number of shaft holders. Each shaft holder slides over the convex surface of platform (13a) and (13 c) and concave surface of unmovable base (5a) and (5c) and controls axis of rotation in response to the axial movement of the platform.

EFFECT: enhanced reliability and simplified structure.

73 cl, 16 dwg

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