Hydrostatic transmission vehicles

 

(57) Abstract:

Usage: in hydraulic vehicles. The inventive hydrostatic transmission wheeled vehicle includes a hydraulic pump and kinematically associated with the wheels of the vehicle reversible hydraulic motor. The hydraulic motor and the hydraulic pump are connected by hose through the three-position valve. In the section between the hydraulic pump and the three-position distributor of pressure and drain hydroline are connected via the controlled shut-off valve. 2 Il.

The invention relates to a hydraulic vehicle and primarily can be used as a hydraulic drive chassis of the truck with an internal combustion engine.

Known hydrostatic transmission wheeled vehicles [1] 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, the key can be used for braking the vehicle. For this you need to open the shutoff valve and move the three-position slide valve of the distributor from the extreme to the neutral position. However, if this movement is done fairly quickly /that cannot be excluded even if it produces qualified driver/ internal channels of the three-position valve is quickly closed, when this stops rotation of the motor, and hence the wheels of the vehicle, i.e. the wheels are blocked. The wheel lock is a sharp and unstable braking of the vehicle, which in many cases is unacceptable. Therefore, the described hydroxyamino transmission really cannot be used as the main braking system of the vehicle that is the drawback.

The invention is directed to solving the problems of safe braking of the vehicle with hydrostatic transmissions for this tool.

The problem is solved in that in the known hydrostatic transmission of a 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 ritaline 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 oral administration;

the first control cavity connected to the first hydroline control with the first source of control pressure and the second control cavity connected to the second hydroline control with a second source of control pressure;

in the first hydroline control is set to the first two-position valve, and the second hydroline management has a two-position distributor;

the first and second two-position valves have their ends cavity control and valve these valves is spring-loaded at one end;

cavity control on-off valves made by springing the ends of the spools of these distributors connected with pressurised hydroline 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;

other cavity control of the second on-off valve connected with the Alenia this allocator.

The invention eliminates the wheels from locking and ensures stable braking of the vehicle with hydrostatic transmissions for this tool.

In Fig. 1 shows a schematic diagram of the proposed hydrostatic transmissions for wheeled vehicles; Fig.2 the dependence of the braking force /x/ speed zero pressure source pressure control /W/.

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 /drawing this cavity is conventionally depicted as a line coincident with the top face of the three-position valve 4, is connected with the on-off valve 11 hydroline control 12, and the second control cavity 13 /the drawing of the cavity coincides with the bottom face of the three-position valve 4/ t is oppozicionniy dispenser 11 is connected to a source of pressure control 16 using the hydroline management 17, and two-position valve 14 is connected with a source of pressure control 18 with hydroline management 19. On-off valves 11 and 14 have their ends cavity control and valve these valves is spring-loaded at one end with a /on the drawing on the left side of the butt-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 hose 20 and 21. The right cavity control on-off valve 11 is connected by hydroline 22 with hydroline 9 /this hydroline is a drain hydroline for the motor 7 when the three-position spool valve 4 in the lower position, i.e. the control cavity 13/, and the right cavity control on-off valve 14 is connected 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 cavity control 10/.

Hydrostatic transmission operates as follows.

Before driving the vehicle operates the hydraulic pump 1 driven shut-off valve 5 nahodite 12,17, 15 and 19, on-off valves 11 and 14 are in the open state /ie valve these valves are located in the right position/. 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, you have to close controlled shut-off valve 5 and include source control pressure 16. The working fluid from the pressure source control 16 enters the first cavity control 10 three-position valve 4, and moves the spool of this valve to the second control cavity 13 /on the drawing in the lower position. Thus the working fluid pumped by the hydraulic pump 1 passes through the pressure hydroline 2, three-position directional valve 4, hydroline 8 to the hydraulic motor 7, which drives the vehicle.

To stop the vehicle moving forward, you managed to open the shutoff valve and zero the pressure control source 16. Depending on the speed reset /W/ a given pressure, there are two ways to hydrostatic transm what about the hydrostatic transmission operates as follows.

Decreasing the pressure of the pressure source control 16 three-position spool valve 4 begins to move to the neutral position on the drawing up, which causes the overlap of the internal channels of the three-position valve 4. The overlap of these channels leads to an increase in pressure in the hydroline 9, which causes the braking of the motor 7, and hence the vehicle. The magnitude of the braking force acting on the vehicle, is directly proportional to the differential pressure in the hose 9 and 3. The maximum value of pressure in the hydroline 9 continuously increases with increasing W from 0 to Waboutand when W=Waboutthis pressure is

,

where F is the force of the spring on the valve on-off valve 11;

Pwiththe pressure in the hydroline 20 /it is equal to the pressure in the drain hydroline 3, because controlled shut-off valve 5 is opened/;

S the cross-sectional area of the valve on-off valve 11.

When W<Wfull coverage of the internal channels of the three-position valve 4 occurs after stopping the vehicle.

If W is greater Wabout, hydrostatic transmission R three-position valve 4 is moved to the neutral position, what causes a partial overlapping of the inner channel of the three-position valve 4. The pressure in the hydroline 9 increases, but once it reaches values of F +PcS/S air valve on-off valve 11 begins to move to the left and partially overlaps the discharge of working 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 supported /up to overshoot/ equal to F+PcS/S until complete stop of the vehicle, and the hydraulic motor, and hence the wheels are able to rotate. After stopping the vehicle the pressure to hydroline 9 drops to 0. The valve on-off valve 11 is returned to its original // right position and three-position spool valve 4 is set in the neutral position.

Because when W>Waboutthe pressure in the hydroline 9 is kept constant, then remains constant and braking force acting on the vehicle. The magnitude of this force is directly proportional

F+PcS/S-PC< / BR>
and does not depend on W, i.e., if W>Wabout, that is due to force F /ie the stiffness of the spring off of the distributor/.

The dependence of the braking force /X/, acting on a vehicle speed of zero pressure source pressure control /W/ when changing W from 0 to shown in Fig.2.

To ensure the vehicle is moving backward, you have to close controlled shut-off valve 5 and include source control pressure 18. While the three-position spool valve 4 is moved to the upper position, and the working fluid from the hydraulic pump 1 is supplied through pressure hydroline 2, three-position directional valve 4 and hydroline 9 in the hydraulic motor 7.

To stop the vehicle moving backward, you must open the controlled shut-off valve 5 and reset the pressure source pressure control 18. During braking of the vehicle moving backward, the pressure source control 18, a two-position distributor 14 and hydroline 8 works exactly the same as the pressure source control 16, a two-position distributor 11 and hydroline 9 when braking the vehicle moving forward.

From this it follows that the hydrostatic transmission eliminates ensures stable braking of the vehicle /ie with constant force braking/, the driver of a vehicle is not required to withstand the speed change control pressure.

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 communicated to each other via a controlled shut-off valve, wherein the three-position valve is spring-loaded with both ends of the spool and two oral administration, the first of which reported the first hydroline control with the first source of control pressure, and a second cavity control reported second hydroline control with a second source of control pressure, in the first hydroline control is set to the first two-position valve, and the second hydroline control is set to off valve, and the first and second two-position valves have their ends cavity control, and spools of these Raspredelitelnaya, communicated with pressure hydroline hydraulic pump, and the other cavity control of the first on-off valve communicated 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 communicated with hydroline drain of the motor when the valve position of the three-position valve from the first cavity to control the dispenser.

 

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