Volume hydromechanical transmission

 

(57) Abstract:

The invention relates to mechanical engineering and can be used in those devices where you want to transfer torque from the engine to the actuators, for example in the transmission of self-propelled vehicles. Volume hydromechanical transmission includes driving and driven shafts connected to the two shafts, three-tier differential, free links each of which through the switching device connected to one of the two reversible adjustable hydraulic machines, one of which is connected through a switching device with a drive shaft, and the other is connected through a switching device with a driven shaft. The transmission is equipped with an additional adjustable motor with common hydroline with two other hydraulic machines and is equipped with a switching device coupling with the driven shaft when the zero position of the regulatory body of the motor. The technical result - the reduction of the total installed capacity of hydraulic machines and increase efficiency. 2 Il.

The invention relates to mechanical engineering and can be used in those devices where you want to transfer torque from the engine to the Executive tromechanical transmission [1] is most similar to the invention according to the structure and the achieved effect. The transmission includes driving and driven shafts connected to the two shafts, three-tier differential, free links each of which through the switching device connected to one of the two reversible adjustable hydraulic machines, one of which is connected through a switching device with a drive shaft, and the other is connected through a switching device with a driven shaft. The switching device can be friction or toothed couplings; some of them can be freewheel clutches. The disadvantages are the counterpart: too large installation capacity of hydraulic machines and the associated low efficiency.

The aim of the invention is the reduction of the total installed capacity of hydraulic machines and increase efficiency.

This goal is achieved by the fact that the volume of the hydro-mechanical transmission is provided with an additional adjustable motor with common hydroline with two other hydraulic machines and is equipped with a switching device coupling with the driven shaft when the zero position of the regulatory body of the motor.

List of figures graphic image:

Fig. 1 is a functional diagram of hydromechanics the cottage contains a drive shaft coupled with three differentials 1 and 2 (described scheme with parallel connection differentials; can be similarly used scheme with a serial, a parallel-serial and serial-parallel connection of differentials), other parts of which are connected with the driven shaft. Free links differentials 1 and 2 are connected through the switching device 3, and 4, respectively, with reversible adjustable hydraulic machines 5 (G1) and 6 (G2) (matching gear not shown in the figure). Assumed that the gear ratio r1differential 1 (the value of r1determined at broken link associated with the hydraulic transmission) more than the same ratio r2differential 2. In this case, the hydraulic machines G1 is connected through a switching device 7 with the driven shaft, and a hydraulic machines G2 is connected through a switching device 8 with the drive shaft. The hydraulic motor 9 (G3) is connected through the switching device 10 with the driven shaft. All three hydraulic machines have common hydroline.

Hydromechanical transmission works as follows. The entire range of variation of the transmission ratio of the transmission is divided into three sub-bands with the work according to the scheme with differential output (A2). With increasing ratio ranging from zero in mode A1, enabled the switching device 4, 7, 10. The hydraulic machines G2 operates as a pump, fluid machines G1 and G3 as motors. Regulatory parameters hydraulic units G2 and G3 be changed: u2from zero upwards; u3from the unit downward.

In the well-known scheme [1] in this mode, as the motor operates one of hydraulic machines. In this case, the hydraulic motor must have a large installation capacity, as it is determined by the need to transmit large torques at small transfer relations and high speed at high gear ratios. Therefore, to reduce the generating capacity it is advisable to connect an additional hydraulic motor G3, which should work only at low gear relations, and then disconnect using the switching device 10. By the time the disable option regulation u3hydraulic G3 is equal to zero, i.e., the governing body of the motor will be in the zero position. During operation, additional G3 motor the hydraulic machines G1 must transmit a constant torque, which is significantly less than the maximum is intellego motor G3 option regulation u1begins to decrease and with a transmission ratio r2will be equal to zero.

In Fig. 2 shows the torque on the shafts of hydraulic machines under combined loading law on driven shaft, characteristic for the transmission of self-propelled vehicles. On x-axis gear ratio i, on the y - axis torque relative to engine torque: the torque on a shaft of the hydraulic machines G1, the moment on the shaft of the hydraulic G3, the total moment of hydraulic machines G1 and G3, equal If in mode A1 worked one hydraulic machines, it would have to develop the moment and its relative installation power would be (max relative time multiplied by max relative speed). On the graph this corresponds to the area of the rectangle bounded by the coordinate axes and in phantom lines, with the vertex coordinates of AcBut since there are two hydraulic machines G1 and G3, developmental moments of their relative installation capacity is where i0- gear ratio, which disconnects the hydraulic machines G3. In the graph, these installation power correspond to the areas of the rectangles bounded by the coordinate axes and dashed lines, with the coordinates of the vertices A1and A3Total p is t and dot-dashed lines). Therefore, the total installation capacity of the two hydraulic units G1 and G3 (if turned off) is in this case less than the required generating capacity of one of the hydraulic machines [2].

With increasing ratio of the transmission and the achievement of the hydraulic machines G1 and G2 of the control parameters, respectively, u1=0 and u2=1 is switched to the second subrange - off device 7 and the device is activated 3 - transmission starts working on the scheme with two differentials (B). Regulatory parameters of hydraulic machines G1 and G2 will change u1from zero upwards, u2from the unit downwards. When the hydraulic machines G1 and G2 of the control parameters u1=1 and u2=0 switches to the third subrange - off device 4 and the device is activated 8 - transmission starts working on the scheme with differential output (A2). All switching occurs in the absence of transmission of the torque between the toggle links.

When the reduction gear ratio of the transmission from a maximum to zero and the switching process of the sub-bands is performed in reverse order. Upon reaching its final otnoshenii body will be in the zero position, i.e. regulation u3will be equal to zero. On further reduction ratio setting regulation u3will increase and will reach unity at zero ratio.

The total installed capacity of hydraulic machines, required for a transfer operation in all three sub-bands will be less when using three hydraulic machines G1, G2, G3 compared using two hydraulic machines G1 and G2. For example, the calculation shows that in the combined law of the loading on the driven shaft and the control range R=7 relative total generating capacity of the three hydraulic units will be N3y= 2,65, and for hydraulic machines would be N2y= 3,24. Because the hydraulic machines G3 only works at small transfer relations (mainly during acceleration), in most of the range of regulation will remain two hydraulic machines G1 and G2 with a relatively small installation capacity (for example Nywill be 1,83). The use of hydraulic machines with less power and reduces mechanical and hydraulic losses in the transmission and increases its efficiency.

Sources of information taken into account in the preparation ASS="ptx2">

2. Frumkin L. A. Volumetric gidroperekisi with three hydraulic machines. Magazine "Tractors and agricultural machinery", 1998, No. 8, pp. 30-34.

Volume hydromechanical transmission that contains the driving and driven shafts connected to the two shafts, three-tier differential, free links each of which through the switching device connected to one of the two reversible adjustable hydraulic machines, one of which is connected through a switching device with a drive shaft, and the other is connected through a switching device with a driven shaft, characterized in that it is provided with an additional adjustable motor with common hydroline with two other hydraulic machines and is equipped with a switching device coupling with the driven shaft when the zero position of the regulatory body of the motor.

 

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