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Valve stroke sensor

A sensor and valve stroke technology, applied in the direction of instruments, valve details, valve devices, etc., can solve problems such as increased cost, component wear, and performance degradation of position detectors, to achieve improved component accuracy, low component prices, and lower prices Effect

Inactive Publication Date: 2008-01-02
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In this position detector, if the gap is narrowed, the core will interfere with the inner side of the inner valve, causing component wear or damage to the core, but if the gap is increased, the detection accuracy will be low, which will degrade the performance of the position detector
[0011] In order to prevent the above problems, it is necessary to use a positioning pin between the valve body and the cover body, and at the same time reduce the coaxiality of the valve column and the inclination of the screw hole to improve the eccentricity, but this will increase the cost and increase the number of assembly processes
In addition, even if the valve body and the cover are aligned during assembly, eccentricity may occur due to vibration and other reasons during use, which will also cause the above-mentioned problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, the valve stroke sensor 1 of the first embodiment will be described based on FIG. 1 , which is a side sectional view of the valve stroke sensor 1 of the first embodiment.

[0029] As shown in FIG. 1 , the valve travel sensor 1 is mainly composed of a valve body 2 , a spool 3 , an assembly bolt 4 , a cover body 5 , a liner 6 , a spring 7 , a retainer 8 , a cap nut 9 and a travel detection unit 10 .

[0030] A spool hole 2a is opened on the valve body 2. In the spool hole 2a, the spool 3 can be freely slidably inserted between the shafts in a close fit. A screw hole 3a is opened on the axis of the spool 3. The screw hole 3a is connected to the shaft. The assembly bolts are screwed together in 4 phases. The mounting bolt 4 has an end side screw 4a screwed into the screw hole 3a at one end and an other end side screw 4b at the other end, and has a flat end surface 4c of the other end side screw 4b. The other end side screw 4 b may also be provided on the valve colum...

Embodiment 2

[0059] Next, the first valve stroke sensor 1A of the second embodiment will be described based on FIG. 2 . FIG. 2 is a side sectional view of the first valve stroke sensor 1A. Hereinafter, the same symbols are used for the same components as those in the conventional example and the first embodiment, and description thereof will be omitted.

[0060] As shown in FIG. 2 , the eccentric absorbing device Dm of the first valve stroke sensor 1A is composed of a first mounting bolt 21 , an H-shaped coupling, and a first detected body 12A.

[0061] The first mounting bolt 21 has a screw 21a screwed into the screw hole 3a at one end, and a rod coupling 21b at the other end. The rod coupling 21b has a ball 21c connected to the H-shaped coupling 22 at its front end. The first mounting bolt 21 is screwed into the threaded hole 3 a provided on the shaft center of the valve column 3 .

[0062] The H-shape coupling 22 is H-shaped, and its two sides are provided with connecting holes 22a f...

Embodiment 3

[0067] Next, the second valve stroke sensor 1B of the third embodiment will be described based on FIG. 3 . FIG. 3 is a side sectional view of the second valve stroke sensor 1B. Hereinafter, the same symbols are used for the same components as those in the conventional example and the first embodiment, and description thereof will be omitted.

[0068] As shown in FIG. 3 , the eccentric absorbing device Dm of the second valve stroke sensor 1B is composed of the second detected body 12B, the first spring 25 and the spring holder 26 .

[0069] The second detected body 12B has a ball 12f and a spring holder 12g connected to the ball 12f at one end of the spool 3, and stepped rod portions 12h and 12j at the center. A cylindrical portion 12b is provided on one end side. The ball 12f of the second to-be-detected body 12B is caulked and assembled via the spring holder 12g.

[0070] The spring holder 12g supports the spring holder 26 pressed by the first spring 25 . The spring holde...

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PUM

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Abstract

To provide a valve stroke sensor in which run-out of a spool and a stroke detecting part are absorbed, working and assembling are easy, and detecting precision is high.The valve stroke sensor detects the stroke of the spool. The valve stroke sensor is composed of an object to be detected which is fixed to an end of the spool of a valve and moving with the spool, a stroke detecting part arranged around the outer side of the object to be detected, and transmitting a signal corresponding to the amount of the stroke, and a run-out absorbing means absorbing the run-out. (C)2004,JPO.

Description

technical field [0001] The invention relates to a valve stroke sensor, in particular to a valve stroke sensor for detecting valve movement, compensation and adjustment of valve movement or control of variable displacement pumps and engines. Background technique [0002] Generally, in the hydraulic circuit, actuators are widely used, and the supply and discharge of pressure oil used to control the action of the actuators must be carried out through valves. This kind of valve is generally inserted into the valve body with a spool closely matched between the shafts. By moving the spool from the neutral position for a certain stroke, the direction of the pressure oil flow is switched to control the action of the actuator. The valve is equipped with a stroke sensor to measure the stroke amount to detect the flow or pressure difference flowing through the valve column, which is used to control the hydraulic equipment. [0003] The stroke sensor added to the valve is assembled wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B15/28F15B13/043F16K31/124F16K51/00F01L9/04G01B21/00
CPCF15B13/02F16K37/0041F15B2211/405F16K37/0083
Inventor 本谷真芳堀秀司山元裕一
Owner KOMATSU LTD