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.

 

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FIELD: transport engineering.

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EFFECT: simplified design of steering hydraulic booster.

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FIELD: transport engineering; power-assisted steering mechanism.

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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.

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