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  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.
FIELD: transport engineering; self-propelled wheeled vehicles.
SUBSTANCE: proposed vehicle contains frame 1 with cab 9, front and rear steerable wheels 4, 6 and middle wheels 5, engine placed behind the cab along vehicle and covered by hood 11. hydrostatic transmission contains pumping station 21 consisting of matching reduction gear driven by engine placed behind the cab, and three pumps connected by pipelines with hydraulic motors providing separate drives of wheels. Hydraulic motors are arranged along frame 1 between sidemembers on solid brackets made in form of boxes with flanges connected with wall of side member between its webs. Invention makes it possible to create ecologically clean and reliable multipurpose all-wheel-drive vehicle of high cross-country capacity with hydrostatic transmission to drive all wheels.
EFFECT: provision of convenient mounting and servicing of transmission units.
5 cl, 7 dwg
FIELD: transport engineering.
SUBSTANCE: invention relates to crawler tractors and it can be used in their full-flow hydrostatic transmissions. Said transmission contains dividing reduction unit 2, two parallel final hydrostatic drives with pumps 3, 4 and hydraulic motors 5, 6, track reduction units 17, 18 and two planetary mechanisms. Planetary mechanisms are installed between hydraulic motors 17, 18 and track reduction units 17, 18. Sun gears 9, 10 of planetary mechanisms are connected with each hydraulic motor by two similar gear trains 7, 9. Carriers 11, 12 of each planetary mechanism are connected with epicyclic wheels 14, 13 of other planetary mechanism and with track reduction units 17, 18. invention improves maneuverability of tractor, provides economic recuperation of brake power from trailing side to leading side at turning of tractor, reduced power load on engine at turning, reduced power losses in hydrostatic drives of transmission of tractor with possibility of use of hydrostatic drives of lower installed power.
EFFECT: improved service characteristics of tractor.
FIELD: transport engineering; automobiles with positive displacement hydraulic drive.
SUBSTANCE: proposed transmission includes constant-capacity guided-vane hydraulic pump mechanically connected with vehicle engine communicating through pressure, drain and suction hydraulic lines through hydraulic distributor enclosing pressure and drain hydraulic lines and playing the part of reversor with at least one constant-capacity reversible guide-vane hydraulic motor to transmit torque to one or two driving wheels of automobile. Spaces of suction and drain hydraulic lines communicate with space of hydraulic tank. Suction hydraulic line passes through adjustable hydraulic restrictor whose control lever is mechanically coupled with automobile accelerator pedal.
EFFECT: simplified design of transmission, reduced fuel consumption and weight of transmission and its cost, and increased efficiency of automobile.
18 cl, 5 dwg
FIELD: mechanical engineering; machine building hydraulics.
SUBSTANCE: invention can be used on vehicles and machine-and-tractor units operating under unsteady conditions of movement. Proposed device contains planetary train 1, reactive link 3 connected with drive gear of oil pump 5. Planetary train is connected through carrier shaft with gearbox 9 and is set into operation by engine 11. Two-step adjustable restrictor 12 is installed in pressure main line of pump. Safety valve 14 and control cock 15 are connected to input of adjustable restrictor, being also installed in pressure main line of pump pneumohydraulic accumulator, being end member of pressure main line, is provided with three spaces. It consists of hydraulic cylinder, free piston, piston with rod, piston position regulator, oil line and oil channel. Space between pistons is filled with oil which regulates volume.
EFFECT: reduced influence of vibrations of external traction load onto functioning of machine-and-tractor unit.
FIELD: transport engineering; hydrostatic transmissions.
SUBSTANCE: proposed hydrostatic transmission contains pumping unit consisting of main and makeup pumps driven by vehicle engine, hydraulic motors connected by main hydraulic lines with pumping unit and forming circulating hydraulic circuit, and electrically driven self-contained pump whose delivery space is connected with hydraulic circuit formed by main hydraulic lines. Hydrostatic transmission is furnished additionally with sealed hydraulic tank with device for charging its air space with compressed air from vehicle pneumatic system and containing shutoff cock, compressed air pressure regulator in sealed hydraulic tank with safety valve and vacuum manual control valve to discharge compressed air from sealed hydraulic tank, two-position manual control valve for alternate hydraulic coupling of suction space of self-contained electrically-driven pump with hydraulic tank and with device for charging the tank with working liquid, check valve arranged in drain hydraulic line at inlet of sealed hydraulic tank, and manually controlled shutoff valve in suction hydraulic line at outlet of sealed hydraulic tank.
EFFECT: improved reliability of hydrostatic transmission of vehicle designed for operation under various road conditions.
5 cl, 1 dwg
FIELD: mechanical engineering.
SUBSTANCE: invention can be used in different vehicles and in devices and mechanisms for clashless engagement of driven shafts. Proposed torque converter contains drive and driven units of converter. Drive unit is made in form of disks 2-5 with slots freely fitted on splined shaft 1. Movable blades are fitted in said slots. Driven unit of converter is made in form of cylindrical housing 7 with driven shaft 16 and rings 11 and 12 fitted on shaft. Disks 2-5 with blades 6 of drive unit of converter are arranged inside rings. Slots in disks 2-5 of drive unit of converter are made through being arranged tangentially. Each of rings 11, 12 in cylindrical housing 7 of converter driven unit is installed for rolling on guide 13, being connected with axle-shaft 14 flush-fitted in cradle of step bearing 15 whose body is in rigid engagement with cylindrical housing 7. With drive unit rotating, summary driven torque is formed from its hydraulic and inertia components. Formulas for calculating the torque are given in description of invention.
EFFECT: improved efficiency of hydraulic - inertia converter, its control system, gearbox of converter and method of torque conversion.
24 cl, 1 tbl, 10 dwg
FIELD: mechanical engineering; vehicle hydraulic drives.
SUBSTANCE: proposed recuperative reversible stepless hydraulic transmission of wheeled vehicle contains drive engine 5, recuperator 20 with overrunning clutch 24, controllable reversible hydraulic machine 18 with pressure and suction and control plunger 8 communicating with hydraulic control system through pipelines, follow-up hydraulic booster with variable-capacity pump 12 of reverse capacity, four non-controllable hydraulic machines 29-32. Each of said hydraulic machines has vehicle wheel, and wheels of vehicle are in contact with road pavement. Recuperator 20 is made in form of planetary reduction gear whose carrier 19 is connected with pump 12 and with hydraulic machine 18 provided with two diametric pressure and two diametric suction spaces and connected with hydraulic machines 29-32 by pipelines. Hydraulic machine 18 contains "floating" plunger 33 with two cylindrical grooves between two end face spaces and "polar" plunger by channels of which end face spaces of floating plunger 33 are communicated, overlapped or reversed with pressure and suction spaces of hydraulic machine 18. Cylindrical grooves of floating plunger 33 synchronously overlap or hydraulically communicate two pressure and two suction spaces of hydraulic machine 18. Lever 6 of polar plunger is mechanically connected with corresponding slot of plate 3 of vehicle speed and reverse control member.
EFFECT: reduced number of control members, dispensing with brake system improved cross-country capacity of vehicle, reduced fuel consumption, reduced acceleration time, increased efficiency.
5 cl, 11 dwg
FIELD: public building structures, particularly drives for showcase rotation.
SUBSTANCE: drive to rotate showcase substantially formed as superimposed disc 4 installed on pin 5 provides force transmission from drive 12 to disc 4 by means of flexible tie having tensioning means. Flexible tie is formed as closed loop of chain 10 having rigid links. The chain passes around the disc 4 along disc surface generator. Drive has sprocket 11 of driving means. The sprocket 11 is installed on shaft of hydraulic drive 12. Hydraulic drive 12 is mounted on plate 13 moving in radial direction relative disc 4 by hydraulic power cylinder 16.
EFFECT: increased safety of the drive, improved disc position adjustment, reduced size, simplified mounting and enhanced maintainability.
7 cl, 2 dwg
FIELD: transport mechanical engineering.
SUBSTANCE: device comprises electric means for measuring working volume of pumps and hydraulic motors and pickup (60) for measuring the speed of rotation of the shaft of the pump station. The electric circuits are provided with threshold control members (67) and (80) interconnected between pickup (6) and the electric means. Between threshold control members (67) and (80) and electric means for changing working volume of pumps (67) and (80) and hydraulic motors (13), (14), (17), and (18) of the drive of end wheels are variable resistors (77), (78), (86), and (87) that are controlled by pickups (89) and (89) of pressure difference in hydraulic circuits of the drive of the intermediate wheels and the drive of each pair of end wheels.
EFFECT: enhanced reliability and prolonged service life.
3 cl, 4 dwg
FIELD: mechanical engineering; production of drive units for engineering tools and motor vehicles.
SUBSTANCE: the invention is pertaining to the field of mechanical engineering and may be used in production of drive units for engineering tools and motor vehicles. The self-regulating infinitely variable speed transmission contains: an input shaft 9 and an output shaft 6, a centrifugal type nonadjustable hydraulic pump 3, a gear differential unit 2 with two output shafts 5, 6 and a nonadjustable hydraulic motor 4. The hydraulic pump 3 is connected to the gear differential unit output shaft 5. The nonadjustable hydraulic motor 4 is connected to the gear differential unit output shaft 6, which is an output shaft of the gear differential unit output shaft. Self-regulation of a torque of the output shaft is depending on a load by changing the number of revolutions per a minute of the centrifugal pump using the differential gear of the he self-regulating infinitely variable speed transmission. The technical result is an increased affordability due to reduction of a quantity of gears and lack of the throttling losses of a liquid and to the complete self-regulation.
EFFECT: the invention ensures an increased affordability due to reduction of a quantity of gears and lack of the throttling losses of a liquid and to the complete self-regulation.