Hydrostatic transmission vehicles

 

(57) Abstract:

The invention relates to a hydraulic drive vehicles. Hydrostatic transmission wheeled vehicle includes a hydraulic pump and kinematically associated with the wheels of the vehicle reversible hydraulic motor. The hydraulic pump and the hydraulic motor are connected by hose through the three-position valve. The first cavity of the three-position control valve connected by hydroline management with a work output of the first controlled servo valve and the second control cavity connected by hydroline management with a work output of the second controlled valve servo. In the first and second hose management set-off valves having their ends cavity control. The inputs of both servo valves connected with a source of control pressure. The drain outputs of the servo valves connected to the hydraulic tank, and work outputs of these valves with inlets of the valve OR, the output of which is connected to the regulating devices of the hydraulic pump and the hydraulic motor, the control cavity controlled shut-off valve. The invention improves the reliability of the braking capacity is referring to the hydraulic vehicles and primarily can be used as a hydraulic drive chassis of the truck with an internal combustion engine.

Known hydrostatic transmission wheeled vehicles (USSR author's certificate N 1168439, M. K. B 60 K 17/10). It contains a hydraulic pump and a reversible hydraulic motor associated with the wheels of the vehicle. The hydraulic pump and the hydraulic motor are connected by hose through the three-position valve controlled by the handle. In the section between the hydraulic pump and the three-position distributor of pressure and drain hydroline connected through a check valve controlled from the brake pedal device.

Described hydrostatic transmission has the following disadvantages: it is almost impossible to use as the main braking system of the vehicle; a big load on the driver of a vehicle, which lowers the performance of the tool and the safety of its operation; large energy consumption.

The claimed invention is directed to solving the problems of safe braking of the vehicle with hydrostatic transmission vehicle performance and vehicle safety by reducing the load on the driver of the tool, reducing energy consumption is STV, containing the hydraulic pump and kinematically associated with the wheels of the vehicle reversible hydraulic motor provided between the hose through the three-position valve, with the section between the hydraulic pump and the three-position distributor of pressure and drain hydroline are connected via the controlled shut-off valve, introduced the following new features: three-position valve is spring-loaded with both ends of the spool and two control cavity, the first cavity of the three-position control valve connected to the first hydroline management with a work output of the first controlled valve servo and the second cavity of the three-position control valve connected to the second hydroline management with a work output of the second controlled valve servo; in the first hydroline control is set to the first two-position valve, and the second hydroline control is set to the second two-position valve; first and second two-position valves have their ends cavity control and valve these valves is spring-loaded at one end; the cavity control on-off valves, what of the hydraulic pump; other cavity control of the first on-off valve connected with hydroline drain of the motor at the position of three-position spool valve from the second cavity control of the dispenser; the other is the control cavity of the second two-position valve connected to hydroline drain of the motor when the valve position of the three-position valve in the first cavity control of the dispenser; drain outputs both controlled servo valves connected to the hydraulic tank; the inputs of both controlled servo valves connected with a source of control pressure; working both outputs controlled servo valves connected to the inlet valve OR the output of which is connected to the regulating devices of the hydraulic pump and the hydraulic motor, the fuel injection device and the control cavity shut-off valve.

In the present invention by using a hydrostatic transmission ensures stable braking of the vehicle. In addition, the proposed transmission allows you to simplify the management of vehicles and to reduce energy consumption by regulating engine speed, torque hydraulic pump, depending who expressed a schematic diagram of the proposed hydrostatic transmissions for wheeled vehicles.

Hydrostatic transmission wheeled vehicle includes a hydraulic pump 1, which is connected pressure hydroline 2 and a drain hydroline 3 with three position directional valve 4, the valve which is spring-loaded from both ends. Pressure hydroline 2 is connected with the drain hydroline 3 through controlled shut-off valve 5. Drain hydroline 3 is connected to the tank 6. Three-position directional valve 4 is connected with the hydraulic motor 7 through the hose 8 and 9. The first cavity control 10 (in the drawing this cavity is conventionally depicted as a line coincident with the top face of the three-position valve 4) three-position valve 4 is connected with an on / off valve 11 hydroline control 12 and the second cavity control 13 (in the drawing, the cavity coincides with the bottom end of the three-position valve 4) three-position valve 4 is connected with an on / off valve 14 hydroline management 15. Dip the dispenser 11 is connected through a hydroline 16 with a work output of the first controlled servo valve 17, is equipped with a foot pedal 18. Two-position valve 14 is connected through a hydroline 19 with a work output of the second UE is steering 17 and 20 are connected via hose 22 to the tank 6. Inputs controlled servo valves 17 and 20 are connected with hydroline 23 with a source of pressure control 24. Work output of the first controlled servo valve 17 with hydroline 25 is connected to one of inputs of the valve 26, and a work output of the second controlled servo valve 20 with hydroline 27 is connected with the second inlet valve 26. The outlet valve 26 is connected through hose management 28, 29, 30, 31, respectively, with the control unit of the hydraulic pump 32, a control unit of the motor 33, the fuel injection device 34 and cavity control controlled shut-off valve 5. On-off valves 11 and 14 have their ends cavity control and valve these valves is spring-loaded at one end (in the drawing on the left side of the ends). Cavity control on-off valves 11 and 14 made by springing the ends of the spools, is connected with the pressure hydroline 2 through the hose 36 and 37. The right cavity control on-off valve 11 is connected by hydroline 38 with hydroline 9 (this hydroline is a drain hydroline for the motor 7 when the three-position valve is operating valve 14 are connected by hydroline 39 with hydroline 8 (this hydroline is a drain hydroline for the motor 7 when the three-position spool valve 4 in its upper position, i.e., the first cavity control 10).

Hydrostatic transmission wheel of the vehicle is as follows.

Before driving wheeled vehicles operate the hydraulic pump 1 and the pressure source control 24. When this engine (in the drawing it is not shown) driving the hydraulic pump 1 has a minimum speed, the pressure in the hose management 12, 16, 15, 19, 28, 29, 30 and 31 missing, on-off valves 11 and 14 and controlled shut-off valve 5 are in the open state. The working fluid pumped by the hydraulic pump 1 pressure hydroline 2, is returned to the input of the hydraulic pump through a controlled shut-off valve 5 and the drain hydroline 3.

To ensure the vehicle is moving forward, press the foot pedal 18. In the hose 25, 16, 12, 28, 29, 30 and 31 receive the control pressure, the magnitude of which is proportional to the pedal 18. The control pressure is supplied into the cavity control controlled shut-off valve 5, the first control cavity 10 of the three-position valve 4, the control unit hydraulic pump 32, the control unit of the motor 33 and the fuel injection device 34. the those which the valve is closed. The three-position spool valve 4 will mix down, while the working fluid pumped by the hydraulic pump 1 passes through the pressure hydroline 2, three-position directional valve 4 and hydroline 8 to the hydraulic motor 7, which drives the vehicle. With the increase of the pedal 18, the control pressure increases, the control unit hydraulic pump 32 increases the working volume of the hydraulic pump 1, the control unit of the motor 33 reduces the working volume of the hydraulic motor 7, and the fuel injection device 34 increases the supply of fuel to the engine torque of the hydraulic pump 1, which increases the engine speed and the vehicle speed.

To stop the vehicle moving forward, enough to let go of the pedal 18. Depending on the speed of release (V) of the said pedal there are two ways to hydrostatic transmissions. If V < V0, hydrostatic transmission operates as follows. As you release the pedal 18 is reduced, the control pressure in the hose 25, 16, 12, 28, 29, 30 and 31, so that the engine speed fall, and the three-position spool valve 4 is moved to the neutral position is repositioning distributor 4, which leads to the increase of pressure in the hydroline 9, and hence the braking of the motor 7. Full coverage of the internal channels of the three-position valve 4 takes place after the stop of the motor 7, by this time fully open controlled shut-off valve 5.

If V > V0, hydrostatic transmission operates as follows. As you release the pedal 18 is reduced, the control pressure in the hose 25, 16, 12, 28, 29, 30 and 31, so that the engine speed fall, and the three-position spool valve 4 is moved to the neutral position. Move the specified spool causes the overlap of the internal channels of the three-position valve 4, which leads to the increase of pressure in the hydroline 9, but as soon as this pressure reaches the value P, the valve on-off valve 11 begins to move to the left and partially overlaps the drain of fluid from the cavity of the control 10, resulting in the speed of movement of the three-position spool valve 4 decreases and is set such that the pressure in the hydroline 9 is supported (up to overshoot) is equal to P. After stopping of the motor 7 (vehicle) the second) position, and the three-position spool valve 4 is set in the neutral position. Even before the complete stop of the vehicle opens controlled shut-off valve 5 and the control unit hydraulic pump 32, the control unit of the motor 33 and the fuel injection device 34 are installed in the original position.

To ensure the vehicle is moving backward, press the pedal 21. In the hose 27, 19, 15, 28, 29, 30 and 31 receive the control pressure. The control pressure is supplied into the cavity control controlled shut-off valve 5, the second control cavity 13 three-position valve 4, the control unit hydraulic pump 32, the control unit of the motor 33 and the fuel injection device 34. Under the action of the pressure control valve controlled shut-off valve 5 is moved to the right, causing this valve is closed. The three-position spool valve 4 is moved upward, while the working fluid pumped by the hydraulic pump 1 passes through the pressure hydroline 2, three-position directional valve 4 and hydroline 9 in the hydraulic motor 7.

To stop the vehicle moving backward, all aspredinidae 14 and hydroline 8 work just as well as a two-position distributor 11 and hydroline 9 when braking the vehicle moving forward.

From the above it follows that the proposed hydrostatic transmission allows you to adjust the fuel consumption depending on the mode of operation of the vehicle, which reduces energy costs. Control the speed and braking of the vehicle by means of two pedals, which simplifies the operation of the vehicle increases its performance and security. In addition, the proposed hydrostatic transmission provides smooth and stable braking of the vehicle, excluding the lock driving wheels.

Hydrostatic transmission wheel of the vehicle containing the hydraulic pump and kinematically associated with the wheels of the vehicle reversible hydraulic motor provided between the hose through the three-position valve, with the section between the hydraulic pump and the three-position distributor of pressure and drain hydroline are connected via the controlled shut-off valve, wherein the three-position valve has podpruzhineny with a work output of the first controlled valve servo, and the second control cavity connected to the second hydroline management with a work output of the second controlled valve servo control, while in the first hydroline control is set to the first two-position valve, and the second hydroline management - second two-position valve, and the first and second two-position valves have their ends cavity control and valve these valves is spring-loaded at one end, while the cavity of the control performed by springing the ends of spools, is connected with the pressure hydroline hydraulic pump, and other cavity control of the first on-off valve connected with hydroline drain of the motor at the position of three-position spool valve from the second cavity control of the distributor, and the other cavity control of the second two-position valve connected to hydroline drain of the motor when the valve position of the three-position valve in the first cavity of the control of this valve, with drain outputs both controlled servo valves connected to the hydraulic tank, and inputs these valves connected to the pressure source control is WHETHER, the output of which is connected to the regulating devices of the hydraulic pump and the hydraulic motor, the fuel injection device and the control cavity controlled shut-off valve.

 

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EFFECT: provision of convenient mounting and servicing of transmission units.

5 cl, 7 dwg

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