Complementary type sealing structure for housing of power steering gear

Abstract

The invention discloses a complement seal structure for the casing of a power steering gear. The complement seal structure comprises a valve body, a seal ring, a packing ring, a sealing ring and a casing, wherein after being provided with a valve core component inside, the valve body is matched with the casing and a sealing gasket in a sealing manner and fixedly connected through bolts, a circular groove is formed on the column of the valve body in the section matched with the inner hole of the casing, and the packing ring and the sealing ring which are positioned adjacently are axially arranged inside the groove. The cross section of the packing ring made of polytetrafluoroethylene is rectangular, the cross section of the sealing ring made of oil resistant rubber is circular, deformation is generated when the working pressure of hydraulic oil acts on the packing ring or the sealing ring, and one of the sealing parts made of flexible materials enables the other sealing part to expand outwards through mutual extrusion, so as to enhance the axial seal and the radial seal. The complement seal structure has the advantages of simple structure, tight sealing and high bearing pressure. The invention is especially suitable to be used as the seal structure of the power steering gear of a heavy duty truck.

Description

technical field [0001] The invention relates to a sealing structure, in particular to a sealing structure which takes into account radial sealing and axial sealing by using two kinds of sealing members with different structural forms. Background technique [0002] The power steering gear is a key component in the steering system of modern automobiles. The power steering gear for domestic trucks is generally a hydraulic power steering gear. Under the same conditions, the hydraulic oil pressure of the power steering gear directly determines its driving force. Due to sealing reasons, the working pressure of the domestic power steering gear's hydraulic oil is controlled below 14MPa, which can meet the requirements of small and medium-sized trucks, while the heavy-duty trucks have a large steering torque, and the driver is laborious to operate. Although increasing the working pressure of the hydraulic oil can improve the steering driving force, the sealing structure between the ...

AI Technical Summary

Problems solved by technology

Due to sealing reasons, the working pressure of the hydraulic oil of the domestic power steering gear is controlled below 14MPa, which can meet the requirements of small and medium-sized trucks, while the heavy-duty trucks have a large steering torque, and the driver is laborious to operate.

Increasing the working pressure of hydraulic oil can improve the steering driving force, but the sealing structure between the valve body and the housing of the prior art power steering gear cannot be effectively sealed, which is prone to leakage and deteriorates the working environment

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