SU564479A1 - Hydromachanical transmission - Google Patents

Description

one

The invention relates to hydromechanical transmissions and can be used in transmissions of transport vehicles, drives for stabilizing the speed of synchronous generators in other drives.

A hydromechanical transmission is known, comprising three differential mechanisms, a three-speed gearbox, and two hydraulic machines, one of which is connected to the input shaft, and the other with sun gears of differential mechanisms.

The disadvantage of this hydromechanical transmission is that the reduction in the installation power of the hydraulic machines and the increase in the QFD of the transmission is achieved due to the considerable complexity of the mechanical part of the drive.

Also known is a three-way hydromechanical transmission comprising a four-stage differential mechanism consisting of two three-stage differentials of the carrier of the first of which is connected to the input shaft of the transmission and the sun gear of the second differential, and the carrier of the second

of the differential — with the input shaft of the transmission and the epixing of the first differential, two hydraulically interconnected adjustable hydraulic machines, one of which is connected via a matching gear with the sun gear of the first active gear 2j.

When using this gear in engine load mode with maximum power hJd, i. . on all working range / LS KS

control zone td, from 00 .. „„ bo. „., maximum and min. VU K and and

for the frequency of rotation of the output shaft, the required mounting points of the hydraulic machines depend on the value of R and are determined by the form N, -0, CR-1) N ,,, leN - P5 - f T} - 1 1 N (1)

A disadvantage of the known transmission is that at large values And the installation capacities of the hydraulic machines are relatively large, which adversely affects the overall dimensions of the transmission. This also leads to a decrease in the transmission efficiency, since the proportion of power transmitted by a hydraulic & branch having a relatively low efficiency also increases. The purpose of the invention is to increase efficiency, reduce the mass and dimensions of the transmission. This is achieved by connecting one of the adjustable hydraulic machines via controlled clutches and gears to the carrier and gear of the first differential gear), and the other via controlled clutches and gear drives. -. country houses - with carrier and epicycle of the second differential. The drawing shows a kinematic diagram of the proposed hydromechanical transmission. The transmission contains a four-stage differential mechanism 1 consisting of two three-stage differentials connected in such a way that the carrier 2 of the first differential is rigidly connected with the input shaft of the third gear and the sun gear 4 of the second differential, and the carrier 5 of the second differential is connected with the output shaft 6 transmission and epicycles 7 first differential. As well as two hydraulically coupled Hbie interconnected adjustable hydraulic masks № 8 and 9, Hydraulic machine 8 is connected via two controllable clutches 1О and 11 and matching gears 12 and 13 with carrier 2 and sun gear 14, and hydraulic machine 9 through two controllable clutches 15 and 16 and matching gears 17 and 18-sec in the Dilom 5 and the second differential gear 19. Two possible options for the operation of the manual transmission guide are as follows. Operation with one switch. In this case, the entire control range M is divided into two equal subbands. In the first sub-band, the transmission operates as a double-stream and the differential at the input of the clutch 10 and 16 is turned off, 11 and 15 are on, and the epic 19 vrach is idle. The adjustment is carried out by changing the adjustment parameter of the hydraulic machine 9 from + 1 to. 1, At that moment, when the increase: the rotational parts of the transmission output shaft by changing the adjustment parameter of the hydraulic machine 9 is completed, the clutches 1O and 16 are turned on, the clutches 11 and 15 are turned OFF, the sun gear 14 is idling. The transmission works as a two-stream with a differential at the output, and the regulation is carried out by changing the regulation parameter of the hydraulic machine 8 from + 1 to –1. If long-term operation is not needed on gear ratios corresponding to the switching mode from one circuit to another, then The transmission efficiency can be increased by eliminating the volume branch from the operation; To do this, you must simultaneously disconnect the .10 and 11 clutches (or 15 and 1b); and turn on the clutches 15 and 16 (or 10 and 11). Work with two switchings. In this case, the switchings associated with the change in the hydromechanical transmission scheme are made when all engine power is transmitted through the mechanical branches, and the hydraulic-bulk branch is inhibited. The entire adjustment range is divided into three subranges. The first sub-range of the transfer operation corresponds to a double-flow -circuit with input at the input: clutches 11 and 15 are turned on. The regulation is carried out by changing the control parameter of the hydraulic machine 9 from one to zero. The first switching is carried out, a cop and the frequency of the raising of the hydraulic machine 8 is equal to bool. In this case, the shaft of the hydraulic machine 9 is idle. At this moment, the clutch 15 is turned off and the clutch 16 is turned on. Further regulation is carried out by changing the parameter of the adjustable hydraulic machine 8 from one to zero, and the hydraulic machine 9 from zero to one at the same time or alternately. Transmission directly works like a three-threaded one. The second switching is carried out when the rotation frequency of the hydraulic machine 9 is zero, and the shaft of the hydraulic machine 8 rotates idle. The hydraulic machine 8 switches from the solar gear 14 to the carrier 2 by turning on the clutch 10 and disengaging the clutch 11. A power flow rupture occurs in this case, as the shaft of the hydraulic machine 8 rotates. The transfer works as a double flow with a differential on the output, and the regulation is carried out by changing the control parameter of the hydraulic machine 8, With this method of switching. Power circulation throughout the entire control range is completely eliminated. A breakdown of the required adjustment range into several subranges (in the first switching option and three in the second) reduces the installation power of the hydraulic machine, the magnitude of which is determined both in that and in the other switching option by the formula M, (l / s-1) K MAX; where Hj is the installation power of the hydromechanical of the hydromechanical transmission, determined with the same adjustment range as that of the transmission without shifting. SRI according to the formula (l). It can be seen from formulas (l) and (2) that the use of the proposed transmission significantly reduces the installation moshiotii of the hydraulic machine. So, for example, at 1 5 the hL / N ratio is 3.2. Reducing the installation capacity of hydraulic machines allows reducing the mass and dimensions of the transmission as a whole. Due to the decrease in the share of power transmitted by the hydrostatic branch, as well as the elimination of the power circulations in the second variant of switching the circuit, the transmission efficiency in the whole range of regulation is different. The formula of the invention is a hydromechanical transmission comprising a four-link differential mechanism consisting of two three-link differentials, the first carrier of which is associated with the input shaft of the transmission and the sun gear of the second differential, and the carrier of the second differential with the output shaft of the transmission and epicyclic of the first differential interconnected adjustable machines, characterized by t & l, which, in order to increase efficiency and reduce the mass and dimensions of the transmission, one of the adjustable hydraulic machines mye Nena through the control clutch and the gears with the first gear and the planet carrier of the differential, and other means actuated clutches and gear - with vodnpom and second differential epicycle. Sources of information taken into account in the examination :. 1. US patent number 3596535, cl. 74-720.5, 1969 2, Bashta T. M, Hydraulic actuators of aircraft, Moscow, Machine Building, 1967, p. 202, fig. 134.

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