Hydraulic power assisted diverter of circulating ball with floatable piston

Abstract

The invention discloses a hydraulic power assisted diverter of a circulating ball with a floatable piston. The hydraulic power assisted diverter of the circulating ball with the floatable piston comprises a valve assembly, a rack piston, a shell and an output shaft. The valve assembly is provided with a screw, and the rack piston is sleeved on the screw. The hydraulic power assisted diverter of the circulating ball with the floatable piston is characterized in that a sealing sliding sleeve is arranged between the end of the rack piston close to the valve assembly and the screw, while a nut is arranged between the other end of the rack piston and the screw. The nut is in clearance fit with the rack piston, and the nut is fixedly arranged on the screw through a steel ball, a ball steel conduit and a conduit hoop. The nut rotates relative to the screw. According to hydraulic power assisted diverter of the circulating ball with the floatable piston provided by the invention, a spiral rollaway nest and the piston are processed independently, so that the hydraulic power assisted diverter of the circulating ball with the floatable piston is simple in process, and when the oil pressure is raised, the spiral rollaway nest is not easy to deform, and the flowing capacity of the steel ball does not deteriorate.

Description

technical field [0001] The invention relates to a vehicle steering device, in particular to a circulating ball hydraulic power steering device. Background technique [0002] The hydraulic power steering is installed at the front of the car near the driver's side. It can provide power assist and assist the driver to complete the steering function when the vehicle is turning. The power source of the hydraulic power steering is the engine, and when the engine is working, it drives the oil pump to work. When the high-pressure oil acts on the end surface (pressure bearing surface) of the piston, it generates thrust on the piston. As the oil pressure rises, the thrust increases. When the thrust increases enough to enable the steering wheel to overcome road resistance, the steering wheel is pushed to rotate, and the vehicle enters the steering state. [0003] The mechanical part of the recirculating ball hydraulic power steering gear is composed of the screw nut transmission pai...

AI Technical Summary

Problems solved by technology

[0004] However, this structure also has the following disadvantages at the same time: 1: The manufacturing process of the spiral raceway is complicated; 2: The accumulation of machining errors may lead to poor coaxiality between the screw spiral raceway and the piston spiral raceway during assembly, which reduces the steel ball The flow ability makes the driver feel heavy when turning the direction; 3: With the increase of oil pressure, the interaction force between the rack on the piston and the tooth fan on the rocker shaft increases, and the piston warps and even deforms to make the steel The flow ability of the ball deteriorates, causing the driver to feel heavy when turning the direction, and in serious cases, the steering gear is stuck, causing major safety accidents

Especially the third one seriously restricts the development of large cylinder diameter recirculating ball hydraulic power steering machine

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