Unloading mechanism of hydraulic steering gear

Abstract

The invention discloses an unloading mechanism of a hydraulic steering gear. The unloading mechanism comprises a casing, a steering screw, a steering nut, a first chamber, a second chamber, a first steel ball, a second steel ball and a screw plug, the surface of the end of the steering screw is provided with a positioning pin, one end of the screw plug is internally provided with a through hole, an external thread of the end of the screw plug is connected with an internal threaded hole of the steering nut in a matched manner, and an internal threaded hole in the other end of the screw plug isconnected with an external thread of one end of a valve seat in a matched manner. A connecting hole of the through hole inside the screw plug communicates with the internal thread hole of the other end of the screw plug, a stepped through hole is arranged inside the valve seat, the first steel ball is arranged at a port of the connecting hole, the first steel ball is connected with the second steel ball arranged in the stepped through hole through a connecting spring, the second steel ball is arranged in a large hole of the stepped through hole, and the casing is provided with a limiting screwextending into the second cavity. One unloading mechanism is used, and therefore occupied space is small, and the problem about insufficient space caused by the arrangement of small cylinder diameterproducts is solved.

Description

technical field [0001] The invention relates to the technical field of automobile steering gear, in particular to an unloading mechanism of a hydraulic steering gear. Background technique [0002] In the existing automotive hydraulic power steering gear unloading mechanism, there are one set of unloading valves for the upper and lower strokes. When the product runs to the limit of the lower stroke, the upper unloading valve unloads. Unloading valve, this kind of unloading valve is not only complex in structure, but also the cylindrical coil spring has poor stability and is easy to get stuck. For some products with a diameter smaller than φ80, there is no space for unloading valves. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an unloading mechanism of a hydraulic steering gear with a simple structure and a small occupied layout space. [0004] In order to achieve the above objectives, the technical solution o...

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Problems solved by technology

[0002] In the existing automotive hydraulic power steering gear unloading mechanism, there are one set of unloading valves for the upper and lower strokes. When the product runs to the limit of the down stroke, the upper unloading valve unloads. Unloading valve, this kind of unloading valve is not only complex in structure, but also the cylindrical coil spring has poor stability and is easy to get stuck. For some products with a diameter smaller than φ80, there is no space for unloading valves

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