Device to reduce stiffness of transmission of machine and tractor sets

FIELD: transport engineering.

SUBSTANCE: invention relates to hydraulic systems and it can be used in different vehicles and machine-and-tractor sets operating under unsteady conditions. Proposed device contains planetary train 1 consisting of crown gear 2 and reaction member 3. Reaction member 3 is connected with gear 4 of drive of oil pump 5 and gear 6 of drive of hydraulic motor 7. Gear 4 of drive of oil pump 5 is connected with pump through overrunning clutch 8. Gear of drive of hydraulic motor 7 is connected with hydraulic motor 7 through overrunning clutch 9. Oil pump 5 is connected to suction main line 10 and pressure main line 11. Hydraulic motor 7 is connected to pressure main line 12 and return main line 13. Planetary train 1 is connected with gearbox 15 by shaft of carrier 14 and is set into motion by clutch 16 of engine 17. Adjustable throttle 18 is installed in pressure main line 11. Safety valve 19, control cock 20 and control hydraulic main line 21 with hydraulic distributor 22 are connected to pressure main line 11 before adjustable throttle 18. Device contains also hydraulic tank 26 and pneumohydraulic accumulator 27 consisting of three spaces.

EFFECT: increased efficiency of device.

1 dwg

 

The invention relates to oil hydraulics and can be used on various vehicles and tractor units (MTA), working in conditions of unsteady modes of motion in the field and transport operations, as well as the steady-state oscillatory load.

A device for reducing the rigidity of the vehicle transmission /1/containing the planetary transmission, the reactive element, oil pump, suction and pressure line, two-stage adjustable throttle, the valve and the valve control tank. The damper valve consists of a sleeve, plunger, spring, adjusting screw and the discharge channel. The hydropneumatic accumulator, as the end element of the pressure line, consists of a cylinder and a free piston.

The disadvantage of this device is that it protects the engine from a specific range of frequencies of the external traction load. And if vibrations are transferred to another frequency range, the known device will operate with low efficiency.

Closest to the proposed invention is a device for reducing the rigidity of the transmission of machine-tractor units /2/containing the planetary transmission, the reactive element of which connection is continued with the gear, oil pump drive, oil pump connected to the suction and discharge lines, the planetary gear shaft pinion carrier is connected with the gearbox and the shaft of the crown gear with the engine through the clutch, the pressure line installed two-stage adjustable inductor to the input of which is connected a relief valve and the valve control, the damper valve is connected in parallel with the inductor, with a tank and a hydropneumatic accumulator, which is the terminal element of the pressure line, the damper valve consists of a sleeve, plunger, spring, adjusting screw and the discharge channel. The hydropneumatic accumulator (GAA), as the end element of the pressure line, is divided into three cavities and has a piston and rod, and the free piston, while the piston rod is equipped with an oil channel through the oil line is connected to the position controller of the pistons.

The disadvantage of this device is that it only has a hydraulic pump, which works in the mode of the motor has a low efficiency, therefore, the known device in that moment, when reduced traction load (at the moment of impact of the stored energy back into the transmission)will work with low efficiency.

The proposed invention solves the problem of increasing the ratio of the useful action of the mechanism, thereby increasing the efficiency of functioning of the machine-tractor unit.

This object is achieved in that the device for decreasing the rigidity of the transmission of machine-tractor units containing a planetary transmission, the reactive element which is connected with the gear oil pump drive gear, oil pump connected to the suction and discharge lines, the planetary gear shaft pinion carrier is connected with the gearbox and the shaft of the crown gear with the engine through the clutch, the pressure line installed two-stage adjustable inductor to the input of which is connected a relief valve and a valve control, with a tank and a hydropneumatic accumulator, which is the terminal element of the pressure line, is divided into three cavities and has a piston rod and the free piston, while the piston rod is equipped with an oil channel through the oil line is connected to the position controller piston, additionally equipped with hydraulic motor parallel to the oil pump (hydraulic pump) valve, and the drive gear of the oil pump and the hydraulic motor are mounted on the shafts of the drive of the oil pump and the hydraulic motor through the overrunning clutch. Overrunning clutch of the hydraulic motor and hydraulic pump opposite actions are relative to each other.

On the Artie shows a General diagram of a device for reducing the rigidity of the transmission of machine-tractor units.

Device for reducing the rigidity of the transmission of machine-tractor units contains the planetary transmission 1, which consists of the crown gear 2 and the reactive element 3, in turn reactive element 3 is connected with the gear 4 oil pump drive gear 5 and the gear 6 of the drive motor 7. Gear 4 drive of the oil pump 5 is connected to the pump through the overrunning clutch 8. Gear 6 of the drive motor 7 is connected to the motor 7 through the overrunning clutch 9. The oil pump 5 is connected to the inlet 10 and outlet 11 highways. The hydraulic motor 7 is connected to a pressure of 12 and drain 13 highways. The planetary gear 1 shaft, pinion carrier 14 is connected to the gearbox 15 and is driven by the clutch 16 engine 17. In the pressure line 11 has a two stage adjustable choke 18. Front adjustable orifice 18 to the pressure line 11 is connected a relief valve 19, the valve control 20 and the control hydraulic line 21 of the hydraulic distributor 22. Hydraulic valve 22 consists of a spool 23, the left return spring 24 and the right of the return spring 25. There is the tank 26 and the hydropneumatic accumulator 27 having three cavities (I - injection, II - managing volume III - pneumatic or air) and consisting of a hydraulic cylinder 28, the free piston 29, the piston rod 30 also includes a position controller piston 31, connected to the oil line 32, and the piston rod has an oil channel 33. Air chamber III of the hydropneumatic accumulator 27 is connected pneumatic control line 34 with hydraulic distributor 22. For feeding air to the air cavity III of the hydropneumatic accumulator 27 is a valve 35.

The device operates as follows: when the clutch 16 at the time of pick-machine-tractor unit starts to rotate the crown gear 2 of the planetary transmission 1, which transmits motion to the reactive element 3 and the gear 4 oil pump drive gear 5 and the gear 6 of the drive motor 7. While the overrunning clutch 8 is closed and transmits the torque on the oil pump 5, and the overrunning clutch 9 is opened and the gear 6 of the drive motor 7 rotates freely on the shaft of the motor 7. Between the pistons 29 and 30 are set a certain distance corresponding to a specific volume of the hydropneumatic accumulator.

The oil pump 5, and sucks the oil from the tank 26, forces it through the hydraulic valve 22 in the hydropneumatic accumulator 27, in one of the cavities of which is pre-compressed air chamber III), and the other two cavities are injected fluid from the hydraulic valve - cavity (I) and a stationary fluid (between d uma pistons - cavity II).

Adjustable orifice 18 in the pressure line 11 provides a rapid build up of oil pressure in the first creep torque MTA in the oil pump 5 and the pressure line 11. The oil in the hydraulic control line 21, overcoming the resistance of the left return spring 24 and the right return spring 25 moves the slide valve 23 to the right, opening the way to the hydropneumatic accumulator 27. The oil filling the cavity of the first hydropneumatic accumulator 27, moves the pistons 29 and 30, compressing the air trapped in the cavity III, resulting in a torque of the oil pump 5 increases, causing increases torque on the shaft drove 14, overcoming the moment of resistance to movement of the MTA. From this moment begins his smooth starting.

The pressure in the hydropneumatic accumulator 27 is growing with some delay smoothly by law compression of air at the joint movement of the pistons 29 and 30. After starting the MTA until the end of the acceleration pressure that creates the oil pump 5 and the torque on the shaft drove 14, remain constant. At the end of the acceleration, the pressure in the hydropneumatic accumulator 27 reaches a maximum value and a value equal to the pressure in the pressure line 11 to reactor 18. After that, the oil pump 5 is stopped and the work load is under working pressure.

When the targeted age is Tania's story external load lead time of transmission increases, consequently the oil pump 5 is turned on and supplies more oil to the hydropneumatic accumulator 27, after which the balance of moments is restored.

When reducing external loads leading torque transmission decreases and ceases to correspond to the moment of resistance of the oil pump 5. In this case, under the pressure of the compressed gas begins to displace the fluid from the hydropneumatic accumulator 27 (side choke - cavity (I), as well as the pressure in the pressure line 11 and the control hydraulic line 21 becomes smaller than in the cavity of the III hydropneumatic accumulator 27, the air control pneumatic line 34 is fed to the hydraulic valve 22 and, overcoming the resistance of the springs 24 and 25, as well as oil, under the control of the hydraulic line 21 (oil displaced from the hydraulic control line 21, helps to [rastormozit] overrunning clutch 8 oil pump 5, forcing to rotate the latter in the opposite direction), moves the spool 23 of the valve 22 to the left, opening the way for the oil from the hydropneumatic accumulator 27 to the motor 7. The hydraulic motor rotates inhibits the overrunning clutch 9 and transmits torque through the gear 6 of the drive motor 7 on the reactive level 3. While the overrunning clutch 8 restoratives and gear 4 drive Mac is anago pump 5 rotates freely on the shaft of the oil pump 5. The stored energy from the hydropneumatic accumulator 27 is returned to the transmission through the hydraulic motor 7, thereby facilitating the increasing power of the MTA. Thus obtained, the additional energy in the transmission is spent on overcoming the resistance to movement of the MTA.

After a sudden increase in the load enters into the work of the relief valve 19, which limits the pressure of the oil pump 5, and hence the lead time of transmission, that is, the torque on the shaft drove 14.

When changing the operation there is a need to change the volume GAA 27.

The volume change is as follows: controller 31 serves a certain portion of the oil in the cavity II oil line 32 and the oil channel 33. The amount of oil in imiportnaja space regulate the amount of PGA (the more oil in the cavity II, the smaller the volume of the GAA and the less oil must be pumped into the cavity I, as a consequence, the rigidity of the device increases, thereby decreasing or increasing the rigidity of the entire device. In turn, gaining the ability to change the rigidity of the entire device, you can configure the entire mechanism in a certain frequency range external traction load.

Sources of information

1. A.S. 748036 Ml2WK 17/10 BI. No. 26, 1980.

2. Pat. 2252148 IPC RU7WK 17/10 BI. No. 14, 2005 (the prototype).

The device delasnerie stiffness of tractor transmission units includes a planetary transmission, reactive element which is connected with the gear oil pump drive gear, oil pump connected to the suction and discharge lines, the planetary gear shaft pinion carrier is connected with the gearbox, in the pressure line installed two adjustable inductor to the input of which is connected a relief valve and a valve control, it does have a tank and a hydropneumatic accumulator, is divided into three cavities and consisting of a cylinder, piston and rod, and the free piston, and a position controller piston is connected to the oil line, and the piston rod has an oil channel, characterized in that the device is installed parallel to the hydraulic motor the hydraulic pump (oil pump) valve, and the drive gear of the oil pump and the hydraulic motor are mounted on the shafts of the drive of the oil pump and the hydraulic motor through the overrunning clutch opposite actions in relation to each other.



 

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5 cl, 7 dwg

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