SU1491750A1 - Control system for hydrostatic/mechanic transmission of self propelled vehicle - Google Patents

Abstract

The invention relates to the transport engineering industry and can be used in systems for the joint control of friction clutches of gearboxes and gear ratios of a volumetric hydraulic drive. The purpose of the invention is to increase durability by reducing the dynamic loads in the box when shifting gears. The control system consists of a pump 1, connected by a hydroline 3 to a metering pump 4 and a spool 5, the plunger 6 of which is kinematically connected to the pedals 7 and 8 controlling the gear ratio of the volume hydraulic drive (OHP) 9, and the housing 10 is connected by a lever 11 zi with the cylinder rod 12 control. When the car is accelerated, the driver, using the pedals 7 and 8, controls through the spool 5 and the control cylinder 12, smoothly moves the control element 13, reducing the OHG gear ratio to a certain minimum value, and then includes the following range in the box with a lower gear ratio. The distributor 20 switches the flow of working fluid to the power cylinder 16, 17, 18 or 19 desired range. The shaft of the metering pump 4 connected to the distributor 20 rotates, and the fluid through the hydroline 24 enters the left cavity of the control cylinder 12, while the rod and the control member 13 are shifted to the right, increasing the gear ratio of the OCP. 2 Il.

Description

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The image1) is related to transport engineering and can be used in joint control systems for friction clutches of speed gearboxes and gear ratios of volumetric hydraulic drive (HHP).

The aim of the invention is to increase the durability by reducing the dynamic loads in the box when shifting gears.

FIG. 1 is a kinematic diagram of the control system; in fig. 2 is a graph characterizing the relationship between the transmission ratios of the transmission (trp) and the volume hydraulic drive (k.m) by a factor. high ranges.

The control system consists of a pump I control, connected via an overflow valve 2 with the help of a hydroline 3 to a pump-; controller 4 (of the TGL-21534 type) and a two-way valve 5, the regulator 6 of which is kinematically connected to the pedals 7 and 8 of the gear ratio voluminous) hydraulic actuator (ОГП) 9. a body K) is connected with the aid of a lever 1 1 of feedback from the rod of the control cylinder 12, and there is a kinematic connection between the rod and the control 13 of the transmission OTHonje of OHG 9. The input of the OGP 9 is connected to the engine, and the output is connected to the primary shaft 14 of the gearbox, the cool moment from which is transmitted through the secondary shaft 15 to the ledge shaft. Switching the range of gear boxes in unison is carried out when the power cylinders 16-19 are connected, connected with rollers to the distributor 20. The right and left cavities of the control cylinder 12 are connected by hydraulic lines 21 and 22 to the two-pin zut. 5 and 1L1dro; 1mini 23 and 24 - with a dosing pump 4.

The system works as follows.

OG P 9 transmits a cool moment from the engine to the input shaft 14 of the gearbox, and then after a couple of gears of one of the ranges - to the output shaft 15 and yes.pee to the driving wheel. Cooling torque from the motor: 1I is transmitted to the pump 1 of the control, which supplies the working fluid through the hydraulic lines 3 to the two-piece spool 5.

When the driver pushes one of the units 7 and 8 of the control n: 1, the nunger 6 mixes and opens one of the outlet windows of the double slider valve 5, depending on the direction of non-engagement of the plunger.

The working fluid in line 21 or 22 (depending on which outlet port is open) is fed into one of the cavities of the control cylinder 12. The rod of qi, 1indra, begins to mix with the control body 13 of the GPO 9, as a result of which, the transfer ratio changes

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the ratio of the UCP 9 and the entire transmission. The feedback lever 11, together with the rod of the control cylinder 12 and the housing 10 of the double stroke spool 5, form the following system which allows the gear ratio of the OHP 9 to vary in proportion to the mixing of the pedals 7 and 8.

The operation of the system when switching transmission ranges is considered by the example of switching from lower gear to higher gear,

In the case when the first range is turned on, the working fluid from the pump 1 goes through the distributor 20 to the power cylinder 16 of the first range friction clutch, thus, in the box VC: the first range is lost. The working fluid from the pump 1 also goes to the dosing pump 4 and the double spool valve 5.

In the OGP 9, the driver, with the help of the next system: cylinder 12 controls - lever 1 1 feedback - two-way spool 5 sets the gear ratio njeHHe, ensuring the movement of the self-propelled machine with the required speed. When switching to the second range, the distributor 20, controlled by the driver, switches the flow of working fluid to the power cylinder 17 of the second-range friction clutch, the working fluid from the power cylinder 16 enters the drain.

At the same time, the shaft of the metering pump 4, kinematically connected with distribution, that 20, turns, the working fluid is supplied hydraulically, 1 line 24 into the left cavity of the control cylinder 12, the stem is mixed to the right (the working fluid into the inner cavity of the hydraulic slide 21 and 22, does not arrive, as the plunger 6 overlaps the exhaust ports).

The control body 13 of the OTHonjeHneM OHP 9 mixes with the rod and thus increases the gear ratio of the GPO 9, and the total gear ratio of the OTHOUjeHHe transmission is kept approximately constant, which allows smooth transition from one range to another, thereby reducing the dynamic loads in the transmission.

When switching from high gear to lower metering pump delivers the working fluid through the hydroline 23 to the right cavity of the control cylinder 12. The rod together with the gearbox control body 13 of the GPO 9 is mixed to the left. The transfer deviation of the GPO 9 is reduced and a smooth shift from high gear to low gear occurs. The rest of the system is similar to the above case.

To maintain total transmission ratio when switching from one range to another, approximately

Permanent working area of gear ratios of GPO 9 is limited.

On fng. Figure 2 shows the graphs of changes in transmission ratios as a function of the RHU gear ratio. The acceleration lines are limited by points I-II-III-IV, inhibitions IV-V-VI-I.

As can be seen from FIG. The 2 lengths of the switching sections II - III and V-VI are different, therefore the parameters of the kinematic chain; distributor 20 - metering pump 4, metering pump 4, the working areas of the pistons in the left and right cavities are chosen so that when switching from high gear to the lower rod of cylinder 12., the control is mixed, ensuring the change of the gear ratio of the OGP by bounded by points V and VI, and from lower to higher - II and III.

The overflow valve 2 serves as a gear shift coupling, an unregulated pump, hydraulically connected via a distributor to hydraulic cylinders for controlling the friction gear shift clutches, hydrostatic

 a transmission consisting of a kinematically connected hydraulic pump with a control element and a hydraulic motor connected to the input shaft of a stepped box, the output shaft of which is connected to the engine, the hydraulic ratio gear ratio pedal, which is in order to increase durability by reducing the dynamic loads in the gearbox when shifting gears, it is equipped with a hydraulic cylinder with control cavities, one end of the rod of which is connected to the control element of the hydraulic pump, a pump-pump with a two-core valve with a plunger located in the housing, hydraulically the maximum pressure in the hydraulic 20 times as large as the unregulated pump with

the control cylinder of the hydraulic cylinder and the metering pump kinematically connected with the distributor, wherein the body of the double spool valve is pivotally connected by means of a lever with another terminal of the control system.

Claims (1)

Invention Formula The control system of the hydrovolume-mechanical transmission of a self-propelled machine, containing a stepped box with fric25 com rod hydraulic cylinder pedals mi control. and the plunger - with , gear clutches, unregulated pump, hydraulically connected via a manifold to hydraulic cylinders for controlling friction gear clutches, hydrostatic a transmission consisting of a kinematically connected hydraulic pump with a control element and a hydraulic motor connected to the input shaft of a stepped box, the output shaft of which is connected to the propulsion unit, the transmission ratio ratio of the hydrostatic transmission, which is increase durability by reducing the dynamic loads in the gearbox when shifting gears, it is equipped with a hydraulic cylinder with control cavities, one end of the rod of which is connected to the control element of the hydraulic pump, pump-do ohm dvuhpo Skov slide valve plunger disposed within the housing fluidly soepolost mi cylinder control and a metering pump is kinematically associated with the control valve, wherein the valve housing dvuhpo Skov pivotally connected with the lever to the other con com rod hydraulic cylinder pedals mi control. and the plunger - with soig