Planetary elastic clutch with adjustable fluid flow

FIELD: transport engineering.

SUBSTANCE: invention can be used in transmissions of tractors and road-building machines under unstable motion conditions. Proposed transmission of vehicle has planetary reduction gear coupled with engine, pneumohydraulic accumulator, hydraulic pump mechanically coupled with one of links of planetary reduction gear. Fitted in pressure main lone are hydraulic distributor and additional three-dimensional member containing adjustable restrictor connected with variable rigidity pneumohydraulic accumulator. Drain main line of pneumohydraulic accumulator is connected through reduction valve with suction main line of hydraulic pump and drain main line of hydraulic distributor.

EFFECT: protection of engine and parts of power train from peak loads by means of reducing valve and from dynamic loads at starting from half, optimization of operation of engine, reduced specific consumption on fuel.

1 dwg

 

The invention relates to transport machinery and can be used in transmissions of tractors and road-building machines, working in conditions of unsteady modes of movement.

Known hydrostatic-reducer was installed self-propelled machine that contains a gear reducer, sequentially mounted in the kinematic chain of transmission associated with gear hydraulic machines constant volume, the pressure hydroline which is a regulator of the flow body control, tank [1].

The disadvantage of the design is its complexity, the lack of damping and changes in operational characteristics of the drive.

Known transmission of the vehicle containing the associated motor planetary gearbox, hydraulic accumulator, hydraulic pump, connected mechanically with one of the components of the planetary gear and the distributor, the first line of which is communicated with the pressure line of the hydraulic pump and the second with the sink [2].

The disadvantage of this design is the inability to protect the engine from a complete stop.

A device for reducing the rigidity of the vehicle transmission, taken as a prototype, containing a planetary transmission, the reactive element which is connected with the oil pump, under the prison to the suction and discharge lines, forcing oil in the hydropneumatic accumulator, transmission, connected with the driven shaft of the planetary transmission, oil tank [3].

The disadvantage of this device is the design complexity of the hydraulic system. The presence of three valves in one hydroline will not provide a smooth change of fluid flow in the damper device. Slow emptying of the pneumohydraulic accumulator through pump sets him reverse rotation, reducing the switching mode of transmission. The stored energy in the pneumohydraulic accumulator is not returned in the transmission of the vehicle.

The objective of the invention is to simplify the design and increase longevity by reducing wear of transmission components, elimination of dynamic loads in power transmission by changing the transmitted torque and increase functionality when the clutch is installed in the transmission.

The technical result is to protect the engine and parts of power transmission from peak loads using the pressure reducing valve and the dynamic loads during starting, that is, providing soft start using the throttle volume, optimize engine performance and reduce fuel consumption.

This technical result in the implementation of the invention is achieved by the fact that it provided the additional volume, containing an adjustable throttle connected a pressure line with a pneumo-hydraulic accumulator variable stiffness. In this case drain line of the battery is connected through a pressure reducing valve to the suction line of the pump.

The drawing shows gidroklimaticheskaya scheme clutch in the drive train. We offer clutch includes flywheel 1, to which the bolt 2 is mounted crown gear 3, within which is located drove 4 connected with the driven shaft 5 clutch satellites 6 engages with the sun gear 7, which is connected with the drive of the hydraulic pump 8. The hydraulic pump has a suction line 9 and the inlet 10 in which is mounted the valve 11 and the discharge pipe 12, the pressure line 13 is connected to the throttle volume 14 and an adjustable throttle 15, pneumohydraulic accumulator 16 is connected to a drain line 17 with the reducing valve 18 and the suction line 9.

The work of the proposed clutch in the drive train of the vehicle is carried out as follows.

Torque from the flywheel 1 is transmitted to the crown gear 3, it starts to rotate and transmits rotation to the satellites 6. Driving the sun gear 7 and the drive of the oil pump 8, which rotates, is pumping oil at its suction mA is astral 9 of the hydraulic system of the vehicle. It is supplied under pressure in the discharge line 10 and approaches the dispenser 11. If the dispenser is closed, the oil goes on the drain line 12, connected with a drain line 17 pneumohydraulic accumulator 16 and the suction line of the hydraulic pump 9. In the closed position of the dispenser 11, the clutch is in the off state, the vehicle is not driven even if the engaged gear. If the valve 11 is opened, the oil line 13 and an additional throttle volume 14. He filled until the oil pressure reaches the pickup value of the inductor 15, which opens up access oil in the pneumatic accumulator 16. At this time begins the first stage of acceleration of the vehicle. The pump delivers the oil until the oil pressure reaches a value that balances the moment of the sun gear acting on the engine side. In this case, the pump 8 is stopped, the sun gear 7 will also stop, but the 6 satellites will start to rotate around its axis, circling the sun gear 7, and to transmit the torque through the pinion carrier 4 on the shaft of the power transmission. The vehicle will start moving forward.

With a significant increase in hook load starts working pressure reducing valve 18, which opens up access oils from newimageprocessorl battery 16 on the drain line 17. In this position the motor is in overload, but not stall, and the vehicle will stop. Therefore, the machine operator will be required to switch to a lower gear. When switching the control valve 11 in position "drain" oil from the throttle volume 14 goes on the drain line 12 that is connected with the suction pipe 9 of the pump. Under the action of the negative pressure generated by the hydraulic pump 8, the throttle amount quickly freed for further filling of oil in the gear change.

Throttle amount in combination with a pneumo-hydraulic accumulator and relief valve helps protect the engine and transmission from the peak dynamic loads not only in the beginning of acceleration, but also during steady-state motion, preventing a complete stop the engine via a pressure reducing valve.

Sources of information

1. Autospid. The USSR №1482829 A1, CL 60 To 17/10, 1989. The hydrostatic creeper gearbox self-propelled machine. Declared 16.09.87. Published 30.05.89. Bulletin No. 20.

2. Autospid. The USSR №1592173 A1, CL 60 To 17/10, 1988. The transmission of the vehicle. Declared 12.12.88. Published 15.09.90. Bull. No. 34.

3. Autospid. The USSR №1062035 And CL 60 To 17/10, 1978. Device for reducing the rigidity of the vehicle transmission. Declared 07.09.82. Published 23.12.83. Bull. No. 47.

The transmission t is ansporting means, contains the associated motor planetary gearbox, pneumatic-hydraulic accumulator, hydraulic pump, mechanically associated with one of the components of the planetary gear, and a valve installed in the pressure line, characterized in that the pressure line is an additional volume containing an adjustable throttle connected with the pneumohydraulic accumulator variable stiffness, while the drain line pneumatic-hydraulic accumulator is connected through a pressure reducing valve with a suction line of the hydraulic pump and drain line valve.



 

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