Steering and braking system and bulldozer

Abstract

The invention discloses a steering and braking system. The steering and braking system comprises a left steering control valve set, a right steering control valve set, a left braking control valve set and a right braking control valve set in which at least one is a pilot control valve set; the pilot control valve set comprises a reversing valve and a first pilot solenoid valve, wherein a first pilot control oil port, a middle oil port and a second pilot control oil port are formed in the reversing valve; when the reversing valve is positioned at a first operating position, the middle oil port and an oil supply oil port are communicated so as to form an oil supply passage, and when the reversing valve is positioned at a second operating position, the middle oil port and an oil drainage oil port are communicated so as to form an oil drainage passage; when the first pilot solenoid valve is positioned at the first operating position, an oil inlet of the first pilot solenoid valve and an oil outlet of the first pilot solenoid valve are communicated so as to form the oil drainage passage, and when the first pilot solenoid valve is positioned at the second operating position, the oil inlet of the first pilot solenoid valve and the oil outlet of the first pilot solenoid valve are not communicated. The steering and braking system is higher in control accuracy and can reduce the labor intensity of a driver. The invention further discloses a bulldozer.

Description

technical field [0001] The invention relates to the technical field of steering braking devices, in particular to a steering braking system with high control precision and capable of reducing the labor intensity of a driver. The invention also relates to a bulldozer comprising the steering brake system described above. Background technique [0002] The steering brake system is one of the key systems to ensure the driving safety of mechanical equipment and improve operating efficiency. It mainly includes the steering gear, the steering gear control hydraulic circuit, the brake and the brake control hydraulic circuit, and the steering gear controls the hydraulic circuit and the brake control hydraulic circuit. Realize the change of working state of steering gear and brake. The performance of the steering braking system is related to the driver's driving safety and operating efficiency, so the structural design of the steering braking system is very important. [0003] The st...

AI Technical Summary

Problems solved by technology

[0004] Obviously, since the driving force of the above-mentioned steering braking system directly depends on the size of the driver's operating force, and there are often large errors in manual operation, the control accuracy of the steering braking system is low; at the same time, due to the The error is large, and higher requirements are put forward for the driver's operating experience, which in turn increases the labor intensity of the operator, which is prone to fatigue and affects the driving safety of the driver.

[0005] In summary, how to alleviate the problems of low control precision of the steering brake system and high labor intensity of the driver caused by manual operation errors has become a technical problem to be solved urgently by those skilled in the art.

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