Hydraulic steering system trolley
(57) Abstract:The invention relates to vehicles, particularly to urban and intercity trolleybuses can be used in other transport devices and allows to increase the reliability of the steering of the trolley and the safety of its operation. The system includes a pumping station 1 having a fixed pump 2 and the hydraulic tank 4, and is connected with the power steering 5, cylinder 6 through the check valve 7 and the valve 8, the pressure transducer consists of giving and receiving cylinders 10 and 13, the control valve 11, the pilot-operated check valve 12, which, through the check valve 7 is connected to the outlet of the pump 2, while the control input of the pilot-operated check valve 12 is connected with the output of the distributor 11. The system also includes a subsystem charging and discharging of the accumulator 14 and consisting of a flow regulator 15, a check valve 16. Served in the piston cylinder chamber 10, the working fluid drives the piston of the hydraulic cylinder 13, providing a constant volume of the working fluid in the system, and push from the rod end of the cylinder 10, the working fluid in the engine charging and discharging of the accumulator 14. When on the magnet 9. 1 Il. The invention relates to the field of transport engineering, in particular, to urban and intercity trolleybuses, and can be used in other transport devices.Known hydraulic control system of the trolley (1), consisting of a pumping station, power-steering, hydraulic cylinder and connecting pipelines.But they do not provide a reliable steering of the trolley when the supply voltage drop in the contact network. In this case, rechargeable batteries with low energy consumption reduces the security of vehicles.Closest to the claimed invention, the technical solution is a hydraulic steering system of the vehicle (2) containing a hydraulic accumulator pressure, a valve mechanism, a pumping station with a tank and a fixed pump connected to the steering through the check valve and the dispenser with the electromagnet. Accumulator pressure has a device charging it with air and is connected via a check valve with the output of the fixed pump. Valve device serves to alternately connect the pump with hidrocloro is authorized capacity, and the capacity of the tank, which, on the one hand, must collect the leakage of the working fluid from the hydraulic system and, therefore, to be as low as possible, and on the other hand, should provide a cavitation free operation mode of the pump, and therefore be located as high as possible.However, in such a system the size of the tank is limited and you cannot achieve great energy accumulator, resulting in a low vehicle safety.The technical problem solved by the invention is to improve the reliability of the steering trolley and security of its operation by increasing the intensity of accumulator systems without changing the capacity of the hydraulic tank and hydraulic accumulator.This task is achieved by the fact that the known hydraulic system steering trolley containing a pumping station with a tank and a fixed pump connected to the steering through the check valve and the valve with solenoid, a hydraulic accumulator pressure with the device charging in the air, connected through a check valve with the outlet of the pump, equipped with a pressure transducer made in the form identical to the hydraulic cylinder connected to the hydraulic tank and power steering, parallel flow regulator and non-return valve, electro-hydraulic pressure switch connected to the accumulator and to the input of the flow regulator, the output of which is connected to odnostoronnim feed cylinder, managing distributor and lock connected through a check valve to the output of the fixed pump, which is connected to the control input of the distributor, while the control input of the pilot-operated check valve connected with the control valve.The invention is illustrated by a drawing, which shows a hydraulic steering system of the trolley.Hydraulic steering system trolley contains a pumping station 1, which includes the fixed pump 2, the safety valve 3 and the tank 4, and is connected with the power steering 5, cylinder 6 through the check valve 7 and the valve 8 solenoid 9, a pressure transducer, consisting of odnostebelnogo feed the working fluid of the hydraulic cylinder 10 connected to the inlet of the control valve 11 and the lock 12, which, through the check valve 7 is connected to the output of the fixed pump 2, while the control input of the Hydra is sa constant supply 2. The hydraulic system also includes odnoslotovyj receiving the working fluid from the hydraulic cylinder 13 connected to the input of the fixed pump 2 and the hydraulic tank 4. The cylinders 10 and 13 are made identical and are connected by rods. The system also includes a subsystem charging and discharging of the accumulator 14 is connected to the feed cylinder 10 and consisting of a flow regulator 15 with parallel non-return valve 16 and is connected to the input of the accumulator 14, and the output of the flow regulator 15 is connected to odnostoronnim feed cylinder 10. The accumulator 14 is attached relief valve 17, the electro-hydraulic pressure switch 18, the device is charging air 19 hydraulic accumulator 14 and a control manometer 20.Hydraulic steering system trolley operates as follows.When applying voltage to the electromagnet 9 switches the dispenser 8 in position II and the entire flow of the working fluid from pump station 1 through the check valve 7 and the locking valve cut 12 is served in odnoslotovyj the feed cylinder 10. Hydraulic power steering with 5 cylinder 6 is disabled. Served in the piston cylinder chamber 10 Rebaudengo cylinder 13, providing a constant volume of the working fluid in the hydraulic system and displaces from the rod end of the feed cylinder 10, the working fluid in the engine charging and discharging of the accumulator 14. Initial charging of the hydraulic accumulator 14 working gas under pressure is carried out using a device charging air 19 visual monitoring of charging on a pressure gauge 20. Upon reaching the desired pressure charging actuates a pressure switch 18 while simultaneously de-energizing of the electromagnet 9. When the valve 8, for example, through the built-in spring means in position I and the flow of the operating fluid to the hydraulic booster 5 is restored.In the normal operation of the pumping station 1, the pressure of the working fluid causes the control valve 11 in position II, thereby blocking the opening of the pilot-operated check valve 12. In the event of unauthorized increase the pressure in the hydraulic accumulator 14 actuates the safety valve 17 and resets the part of the working fluid in the hydraulic tank 4.The failure of the pumping station 1 stops the supply pump 2 and the pressure drop before the non-return valve 7. In this case, the built-in spring distributor 8 voteres the flow regulator 15 working fluid in the rod cavity of the feed cylinder 10 with a flow rate less than consumed by the hydraulic system. In turn, the working fluid from the piston cavity of the feed cylinder 10 opens the locking valve cut 12 and flows through the valve 8 into the hydraulic booster 5. The check valve 7 prevents the leakage of the working fluid through the pumping station 1.Sources of information
1. Trolleybus passenger ZIU-682B. Vesnik Century, and other Meters, Transport, 1977, 208 S.2. U.S. patent N 4204584. MCI 62 D 5/06, NCI 180-133, publ. 1980 (prototype). Hydraulic steering system trolley containing a pumping station with a tank and a fixed pump connected to the steering through the check valve and the valve with solenoid, a hydraulic accumulator pressure with the device charging in the air, connected through a check valve with the output of the fixed pump, characterized in that it is equipped with a pressure transducer made in the form of identical odnoslotovyj giving and receiving cylinders connected by a rod, the receiving cylinder connected to the hydraulic tank and power steering, parallel to the flow regulator and check valve, electrohydraulic is with odnostoronnim feed cylinder, managing distributor and lock connected through a check valve to the output of the fixed pump, which is connected to the control input of the distributor, while the control input of the pilot-operated check valve connected with the control valve.
FIELD: transport engineering.
SUBSTANCE: invention relates to device providing stabilization of wheeled vehicles in motion. Proposed steerable axle with steering gear contains steering knuckles, cross rod operating hydraulic cylinders hinge-connected to axle beam and to steering knuckle and cross rod joints, all mounted on unspring part. Operating hydraulic cylinders act, through steering knuckles, directly onto steerable wheels at turning. Mounted on spring-actuated part are pump units, energy accumulator, steering mechanism in form of device employing for its operation principle of conversion of rotation of steering wheel with steering column into reciprocation of nut-spool thanks to which control of delivery of working liquid from pump to hydraulic cylinders to turn steerable wheels if provided.
EFFECT: reduced metal usage and cost of manufacture, improved operating characteristics and riding comfort owing to simplified design.
4 cl, 2 dwg
FIELD: transport engineering; automobiles.
SUBSTANCE: proposed integral steering mechanism contains case with piston 2 arranged between spaces 3 and 4 communicating with working liquid pressure source by distribution. Screw shaft 6 of distributor is connected with piston 2 by ball-and-worm drive 7. Said screw shaft is provided with roller thrust bearings 8 and 9 as end face supports. Rotor 19 with cam fitted in cavity is installed inside screw shaft 8 on cylindrical antifriction bearings. Said cavity is made in shaft 6 at its end face in contact with bearing 9. rotor 19 is coupled with shaft 6 by torsion bar found in shaft 6 inside its through axial hole and connected by pins with shaft 6 and rotor 19. Pin connecting rotor 19 with torsion bar is arranged in space between said cylindrical antifriction bearings.
EFFECT: simplified design, improved reliability of steering mechanism.
3 cl, 4 dwg
FIELD: automotive industry.
SUBSTANCE: spool mechanism of steering hydraulic booster has housing 5 with ports for drive tie-rods, spool unit 3 and oil channels 18. It is furnished also with lower oil ramp 4 with unions to let oil in and out, 17, 19, 20 and oil channels 18, upper oil ramp 2 with unions of oil main lines 34, 35 connected with chamber 16 of wheel turning power hydraulic cylinders 33 in which like channels group, joining unit 1 and spool unit 3 containing central shutter 6 coupled with steering shaft, follow-up shutter 7 coupled with drive lever from drag rod 28 of car steering mechanism and mode selector shutter 8 connected with selector drive, shutters being installed for turning. All three shutters are arranged in one plane. Spool mechanism provides one of three modes of wheel turning, namely, turning of wheels of front and rear axles to one side, turning of wheels in opposite sides or control of wheels of one front axle only. Steering hydraulic booster proper contains oil pump, spool mechanism indicated above, power hydraulic cylinders 33 installed on front and rear axles of car, oil main lines 34, 35 connecting oil pump with power hydraulic cylinders 33 through spool mechanism 30. Invention simplifies design of steering hydraulic booster and provides three modes of wheel turning, namely, turning of wheels of front and rear axles of car to one side, turning of wheels in opposite sides or control of wheels of one front axle only.
EFFECT: simplified design of steering hydraulic booster.
24 cl, 3 dwg
FIELD: transport engineering; power-assisted steering mechanisms.
SUBSTANCE: proposed vehicle steering mechanism with hydraulic booster contains screw installed in case and mechanically connected with distributor shaft-spool, screw being mechanically coupled through piston-rack with sector, mechanism to cut off hydraulic booster in extreme position of piston-rack being essentially spring loaded plungers arranged in channels of piston-rack engaging with adjusting screws and coupled through threaded joint with case and housing of distributor and fitted by cylindrical shanks into channels of case and housing of hydraulic distributor. Grooves are made in cylindrical shanks of adjusting screws. Spring rings are installed in grooves. Channels of case and distributor housing are closed by shutters made in form of oval plates with holes and circular cuts for fastening bolts. Shutters are made for partial overlapping of channels in case and distributor housing at opening. Radius of oval form of shutter plates in lower part of overlapping of channels of case and distributor housing is found from relation A<R<B where R is radius of semicircle of lower part of shutter plate; A is distance from axis of fastening bolt to channel of case and distributor housing; B is distance from axis of fastening bolt to head of adjusting screw.
EFFECT: improved reliability and convenience of adjustment of hydraulic booster cut off mechanism.
2 cl, 3 dwg
FIELD: transport engineering; power-assisted steering mechanisms.
SUBSTANCE: proposed steering mechanism has case with row of threaded holes on side end faces and rack mechanically coupled by screw with steering shaft, sector whose shaft is installed in bearings and is furnished with working collar from side of splined part, eccentric adjusting bushings whose center is displaced relative to center of holes for bearing whose center is displaced relative to center of holes for bearings of sector shaft through value of eccentricity, and side covers. Side covers are provided with projections on axis of symmetry equidistant from center of covers in diametrical direction and installed for engagement with slots. Said slots are made on round beads on external end faces of eccentric bushings concentrically to holes for bearings of sector shaft. Slots are located on axes passing through centers of eccentric bushings and holes for bearings of sector shaft. Round slots for fastening are made on side covers relative to their center. Length of round slots is either equal to or greater than summary value of distance between threaded holes on side end faces of case arranged near each other and width of round slots. Width of round slots is either equal to or greater than summary value of diameter of threaded holes on side end faces of case and doubled value of eccentricity. Working collar of sector shaft from side of splined part is arranged in eccentric bushing. Additional collar is fitted in central hole made in side cover from side of splined part of sector shaft, concentrically to round slots.
EFFECT: improved steerability of vehicle, and reliability of construction.
FIELD: transport engineering; power-assisted steering mechanism.
SUBSTANCE: proposed steering mechanism with hydraulic booster has case mechanically coupled with shaft-spool of distributor, screw mechanically coupled through piston-rack with sector, mechanism to cut off hydraulic booster in extreme positions of piston-rack including spring-loaded plungers arranged in channels of piston-rack and adjusting screws arranged in channels of case and distributor housing and connected with them by threaded joint. Adjusting screws have cross shanks. Adjusting plugs in form of hollow cylinders with longitudinal slots are arranged in step channels of case and distributor housing. Cross hanks of adjusting screws get into longitudinal slots. End faces of hollow cylinders thrust against end faces of smaller diameter step channels of case and distributor housing. Adjusting plugs are locked by lockrings with possibility of relative rotation.
EFFECT: improved convenience in use, reduced labor input on adjustment off hydraulic booster cut off mechanism.
FIELD: engines and pumps.
SUBSTANCE: proposed limiter is intended for vale hydraulic hardware, particularly, for the car steering booster flow rate and pressure limiters. The aforesaid pressure limiter comprises casing with drain and through channels, the through channel being communicated with cylindrical bore housing spring-loaded flow rate valve spool furnished safety valve arranged inside the latter on the spring side. The bore space on the aforesaid valve side communicates, via a throttle, with the controlled flow rate channel, in its turn, communicating, via a throttle, with the through channel. There is a filter element arranged ahead of the throttling channel to allow a purified liquid to flow the said filter element.
EFFECT: stable and reliable operation.
4 cl, 2 dwg
FIELD: mechanical engineering.
SUBSTANCE: invention relates to mechanical engineering and can be used at construction and manufacturing of cooling system of hydraulic steering amplifiers of vehicles. Cooling system contains autonomous cooling circuit of hydraulic steering amplifier and autonomous cooling circuit of propulsion system. Cooling circuit of hydraulic steering amplifier includes pump, steering device, connected mechanically to steerable wheel, hydraulic actuator, the first radiator, filter and tank, connected hydraulically to each other. Cooling circuit of propulsion system includes the second radiator, thermobimetallic sensor, heat exchanger, containing the first section, power plant and ventilator, connected mechanically to each other. Heat exchanger is additionally outfitted by the second section, inner cavities of which include tubal and intertubular cavities. Intertubular cavities of the second section are connected to cooling circuit of hydraulic steering amplifier, intertubular cavities of the first section are connected to lubrication system of motor, and tubular are connected to cooling circuit of propulsion system.
EFFECT: effectiveness increase of cooling and and hydraulic steering amplifier and propulsion system.
SUBSTANCE: invention relates to hydraulic boosting of steering, particularly, to steering drives with servo mechanisms. In compliance with this invention, steering wheel is turned to move hydraulic control valve from its initial position to direct oil flow from feed pump into geared pump for the latter to bring hydraulic control valve to initial position. Note here that oil flow from geared pump is directed via remote line by hydraulic control valve directly into one of wheel hydraulic cylinder chambers. Steering wheel is fixed in hydraulic boosting system position for straight motion. Note here that controlled wheels and hydraulic control valve are kept in neutral position via negative feedback between geared pump and hydraulic control valve. With hydraulic control valve in neutral position, oil may be discharged from both chambers of actuating hydraulic cylinder of controlled wheels turn into tank via remote line and hydraulic control valves. Proposed system comprises servo circuit with negative feedback that comprises gearing, hydraulic control valve spool valve and hydraulic motor communicated via oil lines with control channels of hydraulic control valve. Steering wheel is coupled with hydraulic control valve spool valve via worm gear. Note also that steering wheel is coupled with hydraulic motor via worm reduction gear with hollow worm gear. Note here that hydraulic motor is made up of reversing geared pump. First inlet-outlet channel of geared pump is communicated via oil line with first control channel of hydraulic control valve, while second inlet-outlet channel is communicated via remote oil line with first chamber of actuating hydraulic cylinder. The latter has its second chamber communicated via remote oil line with second control channel of hydraulic control valve.
EFFECT: ruling out deviation from straight direction at high speed.
2 cl, 1 dwg
FIELD: machine building.
SUBSTANCE: rotation-piston machine has at least one circular channel 1 bent along at least partial arc of circumference, wherein there is movably arranged piston 2 in fluid medium transferring motion; medium enters connection 3 or 4 for fluid medium and flows out through another connection 4 or 3 for fluid medium. By means of lever 5 piston 2 is connected with rotating element arranged with its axis coaxial concentric relative to arc of circumference. Lever 5 is led to the rotating element through a packed gap made in a wall of channel 1 in the direction of piston 2. Packing devices preventing leaks of fluid medium are inserted in a gap area between lever 5 and neighbour sections of the wall on both sides. Lever 5 on one side and neighbour sections of the wall of channel 2 on both sides of the gap are equipped with engaging complementary retaining structures, holding force of which is directed against gap opening.
EFFECT: stable structure facilitating transfer of high torque.
19 cl, 10 dwg