Valve body assembly, piston unit and oil-pressure damper

A technology for hydraulic shock absorbers and components, applied in shock absorbers, shock absorbers, springs/shock absorbers, etc. Tolerance and other issues, to avoid local stress fatigue, ensure matching accuracy, and improve quality stability.

Active Publication Date: 2017-09-08
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of processing the unloading port, it is inevitable to clamp the outer surface of the valve core, and at the same time, the outer surface of the valve core is also impacted by the abrupt force from the machining tool, which affects the cylindricity and Perpendicularity, which affects the clearance fit tolerance between the inner surface of the valve cover and the outer surface of the valve core, thereby affecting the stability of the quality and precision of the oil pressure shock absorber

Method used

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  • Valve body assembly, piston unit and oil-pressure damper
  • Valve body assembly, piston unit and oil-pressure damper
  • Valve body assembly, piston unit and oil-pressure damper

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Embodiment Construction

[0029] In the following, the present invention will be specifically described through exemplary embodiments. It should be understood, however, that elements, structures and characteristics of one embodiment may be beneficially incorporated in other embodiments without further recitation.

[0030] In the description of the present invention, it should be noted that the axial direction refers to the axial direction of the working cylinder and the piston body, and is also the direction in which the piston body moves; the circumferential direction refers to the circumferential direction of the working cylinder and the piston body; The radial direction of the cylinder and piston body; the orientation or positional relationship indicated by the terms "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear" etc. are based on the attached figure 2 And attached image 3 The positional relationship shown is only for the convenience of describing the present invention and s...

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Abstract

The invention provides a valve body assembly. The valve body assembly is arranged on a piston body of an oil-pressure damper. A fluid hole is formed in a valve cover. Oil fluid above the piston body sequentially passes through the fluid hole and a drainage hole, so that the functions of unloading and vibration attenuation are achieved; the situation that in the prior art, the form and location tolerance generated between the valve cover and a valve element when an unloading hole is machined in the side wall of a blind hole of the valve element is affected is avoided; matching precision achieved between the valve cover and the valve element is guaranteed; and furthermore, the valve body assembly is stable in quality and precision performance. The invention further provides a piston unit. The piston unit is applied to the oil-pressure damper and provided with the valve body assembly. The piston unit is stable in quality and precision performance. The invention further provides the oil-pressure damper. The oil-pressure damper is provided with the piston unit and is stable in quality and precision performance.

Description

technical field [0001] The invention belongs to the technical field of oil pressure shock absorbers for rail locomotive vehicles, and in particular relates to a valve body assembly, a piston unit and an oil pressure shock absorber. Background technique [0002] The oil pressure shock absorber for railway rolling stock includes a working cylinder and a piston unit placed in the working cylinder, and the oil cylinder is filled with unloading oil, see figure 1 with figure 2 , the piston unit includes a piston body 11 , and one or more valve body assemblies are arranged on the top of the piston body 11 , and each valve body assembly includes a valve cover 12 , a valve core 13 and a spring 14 . The valve cover 12 and the valve core 13 are both cylindrical structures, the valve cover 12 is axially provided with a through hole 121, the valve core 13 is axially provided with a blind hole 131, and the outer surface of the valve cover 12 is in contact with the The piston body 11 is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F9/34F16F9/32
CPCF16F9/3214F16F9/3405
Inventor 孟范鹏王明海张兴田孙法明丁辉邵立鹏李世双王勇马飞
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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