Device to reduce rigidity of transmission of machine-and-tractor units

FIELD: mechanical engineering; machine building hydraulics.

SUBSTANCE: invention can be used on vehicles and machine-and-tractor units operating under unsteady conditions of movement. Proposed device contains planetary train 1, reactive link 3 connected with drive gear of oil pump 5. Planetary train is connected through carrier shaft with gearbox 9 and is set into operation by engine 11. Two-step adjustable restrictor 12 is installed in pressure main line of pump. Safety valve 14 and control cock 15 are connected to input of adjustable restrictor, being also installed in pressure main line of pump pneumohydraulic accumulator, being end member of pressure main line, is provided with three spaces. It consists of hydraulic cylinder, free piston, piston with rod, piston position regulator, oil line and oil channel. Space between pistons is filled with oil which regulates volume.

EFFECT: reduced influence of vibrations of external traction load onto functioning of machine-and-tractor unit.

2 dwg

 

The invention relates to oil hydraulics and can be used on a variety of machine-tractor units (MTA), working in conditions of unsteady modes of motion in the field and transport operations.

A device for reducing the rigidity of the vehicle transmission [1], comprising a planetary transmission, the reactive element, oil pump, suction and discharge lines, oil tank, pressure trunk-mounted adjustable choke and parallel to the same line mounted pressure relief valve and the valve control, hydropneumatic accumulator.

The disadvantage of this device [1] is that fluctuations in external tensile loads are transmitted to the engine due to the large hydraulic resistance of the adjustable choke is installed between the oil pump and the hydropneumatic accumulator in the pressure line.

Closest to the proposed invention is a device for reducing the rigidity of the vehicle transmission [2], 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 cargo the aqueous 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 [2] 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.

The proposed invention solves the problem of reducing the influence of fluctuations of the external tensile loads at the various operations on the efficient functioning of the machine-tractor unit.

This object is achieved in that the hydropneumatic accumulator (GAA) 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.

Figure 1 shows the General scheme of the hydromechanical damper in the transmission; figure 2 - a hydropneumatic accumulator.

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. The oil pump 5 is connected to the inlet 6 and outlet 7 highways. The plan is tarn transmission shaft 1 led 8 is connected with a gear box 9 and is driven by the clutch 10 of the engine 11. In the pressure line 7 installed two-stage adjustable choke 12, to the inlet 13 which is connected a relief valve 14 and the valve control 15. The damper valve 16 is connected in parallel two-stage adjustable choke 12. There is a tank 17 and the hydropneumatic accumulator 18 with three cavity (I, II, III) and consisting of a hydraulic cylinder 19, the free piston 20, the piston rod 21, and a position controller piston 22 is connected to the oil line 23, and the piston rod has an oil channel 24.

The device operates as follows: when the clutch 10 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 last one on the gear 4 oil pump drive gear 5. The pistons 20 and 21 are set in a certain position for a certain amount of the hydropneumatic accumulator. The oil pump 5, and sucks the oil from the tank 17, forces it in a hydropneumatic accumulator 18, in one of the cavities of which is pre-compressed air chamber III), and the other two cavities are injected fluid (side choke - cavity (I) and stationary fluid between the two pistons - cavity II).

Adjustable throttle 12 in the pressure line provides rapid build up of oil pressure in the oil pump 5 at the first moment of starting the MTA. As a result of this torque the oil pump 5 increases, causing increases torque on the shaft drove 8, overcoming the moment of resistance to movement of the MTA. From this moment begins his smooth starting.

The pressure in the hydropneumatic accumulator 18 is growing with some delay smoothly by law compression of air at the joint movement of the pistons 20 and 21. After starting the MTA until the end of the acceleration pressure that creates the oil pump 5, and the torque on the shaft drove 8 remain constant. At the end of the acceleration, the pressure in the hydropneumatic accumulator 18 reaches the maximum value and the value of the pressure in the pressure line 7 to reactor 12. After that, the oil pump 5 is stopped and the work load is under working pressure. With increasing external load lead time of transmission increases, resulting oil pump 5 is turned on and supplies more oil to the hydropneumatic accumulator 18, 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 18 (side choke - cavity (I), and the plate is adjustable throttle 12 departs from KOR the USA. Through the resulting additional section of the fluid flows freely to the oil pump 5, which starts to operate as a hydraulic motor (rotating in the opposite direction), 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 14, which limits the pressure of the oil pump 5, and hence the lead time of transmission, that is, the torque on the shaft drove 8.

Fluctuations in the external traction load within a certain range of frequencies for a particular operation in the work enters the damper valve 16.

When changing the operation will also change the frequency range. Will be a delay in operation of the device, therefore, a large part of the fluctuations of the external load is transmitted to the motor 11, so there is a need to change the volume GAA 18.

The volume change is as follows: controller 22 serves a certain portion of the oil in the cavity II oil line 23 and the oil channel 24. 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 usteristrasse), thereby reducing 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, MCL260 To 17/10, Bulletin No. 26, 1980.

2. A.S. 1062035, IPC560 To 17/10, Bulletin N 47, 1983 (prototype).

Device for reducing 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 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, wherein the hydropneumatic accumulator is divided into three cavities and has a piston and rod, and the free piston, while the piston Stoke is provided with an oil channel, through the oil line is connected to the position controller of the pistons.



 

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