Apparatus for measuring the position of a piston in a cylinder

An internal piston and cylinder technology, applied in the field of position sensors, can solve the problems of reduced measurement accuracy, reduced sensor life, damage, etc., and achieve accurate measurement results

Active Publication Date: 2008-08-06
HISPANO SUIZA SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The magnetic cores 320, 340 are then no longer centered with respect to the respective transformers 310, 330 and can thus be damaged, resulting in reduced sensor life and reduced measurement accuracy

Method used

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  • Apparatus for measuring the position of a piston in a cylinder
  • Apparatus for measuring the position of a piston in a cylinder
  • Apparatus for measuring the position of a piston in a cylinder

Examples

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Embodiment Construction

[0035] Referring to FIG. 4 , the lifting device comprises a cylinder 1 extending along the X-axis, within which a piston 2 is arranged, the piston 2 comprising a piston head 2A whose outer diameter corresponds to the inner diameter of the cylinder 1 . The lifting device comprises means for measuring the position of the piston 2 relative to the cylinder 1 comprising two position sensors 3, 4 of the LVDT type.

[0036] Each sensor 3,4 includes a magnetic core 20,40 which cooperates with a transformer 10,30 as previously described. The transformers 10, 30 are arranged longitudinally along the axis X inside the cylinder 1 and fixed at the downstream end of the cylinder. The transformers 10, 30 are enclosed in a protective sheath 60, which extends longitudinally inside the cylinder 1, and whose downstream end is fixed integrally with the downstream end of the cylinder 1. The protective sleeve 60 extends concentrically inside the piston 2 and comprises, at its downstream end, the t...

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PUM

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Abstract

This invention relates to a device for measuring the position of a piston (2) in a cylinder (1), extending according to an axis, the device comprising at least two position sensors (3,4) respectively comprising: a first sensor member (20,40) integral with a supporting pallet (31) linked to the piston (2), a second sensor member (10,30) integral with the cylinder (1), the first and second members of each sensor being arranged for being mobile in translation one relative to the other, along an axis parallel to the axis of the cylinder (1), the device being characterized in that the first sensor members (20,40) are integral with the same supporting pallet (31) being linked to the piston (2) by a ball joint link (50). Using the device of this invention, a position sensor can be arranged in the cylinder, without having the transversal strains on the piston being transmitted to it, while the piston remains free in rotation about the axis of the cylindrical barrel.

Description

technical field [0001] The invention relates to the field of position sensors for measuring the position of pistons in cylinders, including those used in aircraft engines. Background technique [0002] For position sensors, such as active (inductive) linear shift sensor, people in the field may be more familiar with its English abbreviation LVDT, which means "linear variable differential transformer", and the position sensor can determine The longitudinal position of the piston within the cylinder. [0003] Referring to Fig. 1, the LVDT sensor 100 includes a movable magnetic core 120 fixed to a stem 121 along an axis 100A, and a fixed transformer 110 composed of three cylindrical coils which are aligned with the axis 100A of the stem 121. Coaxially, a primary winding 111 and two secondary windings 112, 113 are formed. In operation, stem 121 translates on its axis 100A. The magnetic core 120 generates a voltage between the windings 111 , 112 , 113 through magnetic inductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/00F15B15/28
CPCG01D5/2291F15B15/2815F15B15/2892F15B15/2861G01D11/30F15B15/1466
Inventor 亨利-罗格·莱克勒克丹尼尔·凯特勒让-波尔·巴斯
Owner HISPANO SUIZA SA
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