Bidirectional prefill valve and braking system of full-hydraulic wheel type engineering vehicle

Abstract

The invention belongs to the field of hydraulic control, and particularly relates to a two-way prefill valve which is characterized in that an oil inlet P of the two-way prefill valve is communicated with an oil inlet of a logic valve and an oil inlet of a one-way valve I, and an oil outlet of the one-way valve I is communicated with a spring cavity of an unloading valve, an oil inlet of an overflow valve and an oil inlet of a balance adjusting rod; a spring cavity of the logic valve is communicated with an oil inlet of the unloading valve, and an oil outlet of the logic valve, an oil outlet of the unloading valve and an oil outlet of the overflow valve are all communicated with an oil return opening T of the two-way prefill valve; one oil outlet of the balance adjusting rod is communicated with an oil inlet of the one-way valve II, the other oil outlet of the balance adjusting rod is communicated with an oil inlet of the one-way valve III, an oil outlet of the one-way valve II is communicated with an oil port ACCA and an oil port AB of the two-way prefill valve, and an oil outlet of the one-way valve III is communicated with an oil port ACCB and an oil port AC of the two-way prefill valve. And the logic valve selects to charge or unload the energy accumulator, and the unloading valve limits the pressure interval of starting to charge the energy accumulator and ending to charge the energy accumulator.

Description

technical field [0001] The invention belongs to the field of hydraulic control, and in particular relates to a two-way filling valve and a braking system of a full hydraulic wheeled engineering vehicle. Background technique [0002] The braking system plays an extremely important role in ensuring the driving and operation of wheeled engineering vehicles. The traditional pneumatic and air-hydraulic braking systems require many components, low output pressure, and unstable braking. To meet the high safety requirements of construction vehicles, the full hydraulic braking system is widely used in various construction vehicles with the advantages of high integration, stable control and stable braking. The full hydraulic braking system passes through the accumulator charging valve. Charge the accumulator to maintain the pressure of the accumulator within a stable range, provide power to the brake circuit when braking, and act as a brake valve in the event of hydraulic pump damage ...

AI Technical Summary

Problems solved by technology

[0002] The braking system plays an extremely important role in ensuring the driving and operation of wheeled engineering vehicles. The traditional pneumatic and gas-hydraulic braking systems are difficult to operate due to defects such as many components required, low output pressure, and unstable braking. To meet the high safety requirements of engineering vehicles, the full hydraulic braking system is widely used in various engineering vehicles due to its advantages of high integration, stable control, and smooth braking. The full hydraulic braking system passes through the accumulator filling valve Fill the accumulator to maintain the pressure of the accumulator in a stable range, provide power for the brake circuit during braking, and provide power for the brake valve in the event of hydraulic pump damage or engine shutdown. Provide braking power source to ensure driving safety

[0003] The principle and structure of the traditional liquid filling valve are more complicated, the design and manufacture are difficult, and the cost is higher

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