Extra-large-cylinder-diameter hydraulic power steering gear with safety valve

Abstract

The invention relates to an extra-large-cylinder-diameter hydraulic power steering gear with a safety valve. The extra-large-cylinder-diameter hydraulic power steering gear is mainly used for heavy-duty freight cars and dumpers special for mines, and comprises a shell, a nut assembly, unloading valves and a safety valve assembly; an inner cavity of the shell is divided by the nut assembly into an upper cavity and a lower cavity, the safety valve assembly is arranged at one end of the position, on one side of the upper cavity, of the shell, an end cover is arranged at the position, in contact with the safety valve assembly, on the side close to the upper cavity, and a tooth-shaped valve sleeve screw is arranged in an inner cavity of the end cover. An input shaft is arranged inside the tooth-shaped valve sleeve screw, the tooth-shaped valve sleeve screw is connected with the nut assembly in a steel ball meshing fit mode, a nut is movably connected with a rocker shaft assembly through a gear rack pair, the unloading valves are installed at the two ends of a steering nut through hole and communicated with the upper cavity and the lower cavity, a safety valve is arranged for limiting the highest pressure of a system, the hydraulic oil circulation temperature drops, and therefore an oil pump is protected. Torque is larger, the cylinder diameter is larger, pressure is higher, parts are better in strength, the overall machine is better in mechanical performance, and the higher safety factors are achieved.

Description

[0001] Technical Field The present invention relates to a steering gear for automobiles, in particular to a super large bore hydraulic power steering gear with a safety valve, which is mainly used for heavy-duty trucks and special dump trucks for mines, and belongs to the field of high-power and high-torque machinery. Background technique [0002] In recent years, with the rapid development of my country's automobile industry, the production level and use functions of automobile steering gears have been greatly improved. These high-power power steering gears have high requirements on their sealing and the precision of mechanical power transmission parts. The inverter is one of the important safety parts of the car, and its work must be safe and reliable. [0003] The greater the cargo load of the car, the greater the power required and the greater the output torque. It is required to match the performance of the car with high power and a safer and more reliable steering gea...

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Problems solved by technology

[0003] The greater the cargo load of the car, the greater the power required and the greater the output torque, which requires high-power car performance and a safer and more reliable steering gear Matching; at present, most of the domestic hydraulic power steering gears have a bore range of 70-80mm. This kind of small and medium bore steering gear has a small limit on the wheel when the car turns, and the kinetic energy and impact force are small, so it is difficult to apply to heavy-duty trucks. , mine special dump trucks, etc., the market prospect is poor; and the ultra-large bore hydraulic power steering gear is more difficult to design than the commonly used small and medium bore hydraulic power steering gear due to harsh service conditions, heavy load, bad road conditions and more dust; Due to the large impact load, it is necessary to consider the protection of the steering gear body and the oil pump when the working pressure is too high, the impact on the oil seal, and the intrusion of external dust and mud, which will cause the leakage of hydraulic oil

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