JPH09189570A - Probe shaft structure of multiple differential transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by forming a screw hole communicating with a fitting hole fitted in an axial part of a probe and a blazing of a larger diameter than that of the screw hole, fixing a screw part and the blazing hole by a blazing part, minimizing an inclination of the probe and letting the probe slide smoothly. SOLUTION: A fitting hole 10 formed in a probe-holding body 1 communicates with a screw hole 3, and a blazing hole 11 of a larger diameter than that of the screw hole 3 is formed to communicate with the screw hole 3. An axial part 4b of a probe 4 is fitted in the fitting hole 10, and a screw part 4a formed communicating with the axial part 4b is engaged in the screw hole 3 to project into the blazing hole 11. The screw part 4a is arranged coaxially with the blazing hole 11 and rigidly and fixedly coupled into one body by a blazing part 12. Since the axial part 4b of the probe 4 is fitted ion the fitting hole 10, and the screw part 4a of the probe is engaged with the screw hole 3 and fixed in the blazing hole 11 by the blazing part 12, the probe 4 is hard to incline.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe shaft structure of a multiple differential transformer, and more particularly, to minimize the tilt of the probe shaft portion in a probe holder to reduce smooth sliding of the probe and wear of the probe. And a new improvement for improving reliability.

[0002]

2. Description of the Related Art Conventionally, the structure shown in FIGS. 3 and 4 has been adopted as the probe shaft structure of this type of multiple differential transformer that has been used conventionally. That is, the reference numeral 1 shown in FIG. 3 is a handle 2 which is slidably provided in a cylindrical body containing an exciting coil and a detecting coil (not shown).
Is a disk-shaped probe holding body having a plurality of screw holes 3 formed in the probe holding body 1, and screw portions 4a of a probe 4 made of a rod-shaped magnetic body are respectively screwed into the screw holes 3. A brazing portion 5 is formed between the front end surface 1a of the probe holder 1 and the screw portion 4a of the probe 4.

[0003]

Since the probe shaft structure of the conventional multiple differential transformer is configured as described above, the following problems exist. That is, since the fixing structure of the probe and the probe holder is only a combination of screw tightening and brazing part, the brazing filler metal fills the gap of the screw part, and the gap is as shown in FIG. Since the probe is not uniform, the probe is inclined as shown in FIG. 3, and the probe is worn due to sliding with the cylindrical body, which requires a great amount of adjustment time for correction.

The present invention has been made to solve the above problems, and in particular, minimizes the tilting of the shaft portion of the probe in the probe holder to reduce the smooth sliding of the probe and wear of the probe. In addition, it is an object of the present invention to provide a probe shaft structure of a multiple differential transformer which is improved in reliability.

[0005]

A probe shaft structure of a multiple differential transformer according to the present invention is a multiple shaft having a plurality of probes which are slid in a cylinder having an exciting coil and a detecting coil and are held by a probe holder. In the probe shaft structure of the differential transformer, a fitting hole formed in the probe holder for fitting the shaft part of the probe, a screw hole formed in communication with the fitting hole, and more than the screw hole A brazing hole formed with a large diameter, the threaded portion at the end of the shaft portion is located in the brazing hole through the threaded hole, and the threaded portion and the brazing hole are It is fixed by a brazing part.

More specifically, the brazing hole is opened at the handle-side end face of the probe holder, and the brazing portion is exposed at the end face.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a probe shaft structure for a multiple differential transformer according to the present invention will be described in detail below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. In FIG. 1, reference numeral 1 denotes a disc-shaped probe holder having a handle 2 slidably provided in a cylinder containing an excitation coil and a detection coil (not shown). A plurality of formed fitting holes 10 and screw holes 3 are formed so as to communicate with each other, and a brazing hole 11 having a diameter larger than the inner diameters of the fitting holes 10 and the screw holes 3 communicates with the screw holes 3. Is formed. The shaft portion 4b of the plurality of probes 4 is fitted in the fitting hole 10, and the screw portion 4a formed in communication with the shaft portion 4b is screwed into the screw hole 3 and the screw hole 4a is formed. It is located so as to project into the brazing hole 11.

The brazing hole 11 is opened in the end surface 1b of the probe holder 1 on the handle 2 side, and the screw portion 4a protruding into the brazing hole 11 is the same as the brazing hole 11. Positioned with the same axis (shown in FIG. 2), the brazing portion 12 filled in the brazing hole 11 integrally and firmly connects the screw portion 4a and the brazing hole 11 together. The fixing of the screw portion 4a has been achieved. Therefore, when viewed from the end face 1b side, the brazing portion 12 is formed so as to be exposed at the end face 1b.

In the probe 4, the shaft portion 4b has a fitting hole 10
And the screw portion 4a is screwed into the screw hole 3,
Is fixed by the brazing portion 12 in the brazing hole 11, the inclination of the probe 4 is unlikely to occur, and the screw portion 4a is fixed coaxially with the brazing hole 11 as shown in FIG. ing.

[0010]

Since the probe shaft structure of the multiple differential transformer according to the present invention is constructed as described above, the following effects can be obtained. That is, the shaft portion of the probe fits into the fitting hole of the probe holder, the screw portion is located in the brazing hole through the screw hole, and the screw portion and the brazing hole are fixed by the brazing portion. Therefore, the rattling of the probe is eliminated and the inclination can be suppressed almost completely. Therefore, the probe slides smoothly and high reliability can be obtained. In addition, since the brazing hole is open to the handle side, it is easy to remove oxides generated after brazing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram showing a probe shaft structure of a multiple differential transformer according to the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a cross-sectional configuration diagram showing a conventional configuration.

FIG. 4 is a view on arrow A in FIG.

[Explanation of symbols]

 1 probe holder 2 handle 3 screw hole 4 probe 4a screw part 4b shaft part 10 fitting hole 11 brazing hole 12 brazing part

Claims (2)

[Claims] 1. A probe shaft structure of a multiple differential transformer having a plurality of probes (4) held in a probe holder (1), which slides in a cylinder having an excitation coil and a detection coil, and wherein the probe has a structure. A fitting hole (10) formed in the holding body (1) for fitting the shaft portion (4b) of the probe (4), and the fitting hole
Screw hole (3) formed in communication with (10) and this screw hole (3)
And a brazing hole (11) having a larger diameter than that of the shaft portion (4b) at the end of the screw portion (4a) through the screw hole (3) through the brazing hole (11). ) And the screw part (4a)
A probe shaft structure for a multiple differential transformer, characterized in that the brazing hole (11) and the brazing hole (11) are fixed by a brazing part (12). 2. The brazing hole (11) is opened in an end face (1b) of the probe holder (1) on the handle (2) side, and the brazing portion (1b) is formed in the end face (1b). The probe shaft structure for a multiple differential transformer according to claim 1, wherein the structure (12) is exposed.