JPH085376Y2 - Coupling member for two components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a connecting member for two components according to the preamble of claim 1.

[Prior Art] It is already known to elastically couple two components together via a coil spring. However, this combination is extremely uneconomical and limited in use. According to another type of connection, the position sensor mounted on the magnet armature moves in the pressure tube or coil with little play, in which case both parts are connected to each other by a rod. A position sensor must be positioned to center the core with respect to the tube. Positioning the core is an expensive task. High friction and thus high wear of the core which is not concentrically centered with respect to the pressure tube, and in addition the output signal of the position sensor shows high hysteresis. When the deviation of the core center from the pressure pipe center is extremely large, the core is broken.

[Problem of the Invention] The present invention is to eliminate the need for positioning the core.

[Means for Solving the Problems] The gist of the present invention which has solved the above problems is as set forth in claim 1.

[Operation and effect of the device] The advantage of the device is that the mounting is extremely easy.
Despite the significantly shorter overall length of the coupling members, there are regions of significant flexural resilience, so that core positioning is not necessary. By increasing the number of cross-section reduction parts,
The mechanical strength of the joining member does not change and the elasticity increases. This joining element can be produced by a cost-effective plastic injection technique. At the same time, the iron core sleeve and the shaft of the magnet mover are embedded at the same time. Therefore, no additional separate parts are needed. The additional gluing or pressing work for fixing is dispensed with.

 Advantageous configurations of the invention are described in the other claims.

[Embodiment] In FIG. 1, reference numeral 10 designates a connecting member made of plastic, which is used to receive the ferrite core 13 and is provided with a brim 12.
And a ferrite core 13 of this coupling member is movable in a pressure tube or coil (not shown). Furthermore, this coupling member 10 is provided with a bending elastic shaft portion 16 and a cup-shaped portion following the shaft portion 16, and a connecting member 20 formed as a nut is immovably arranged in this cup-shaped portion. Has been done. This connecting member serves to receive a magnet armature or a switching rod (not shown).

The shaft portion 16 is made of plastic and has a bending elastic region, and this region is formed with two cross-section reducing portions which are formed one behind the other in the axial direction of the shaft portion and which are offset from each other by 90 degrees in the circumferential direction. It has 23, 24. In the embodiment of FIG. 1, the cross-section reductions 23, 24 are formed as cutouts formed from two sides which are diametrically opposed. Therefore, as can be seen in FIG. 3, a centrally centered cross section 25 results. The cross-sections 25 of the cross-section reduction portions 23, 24 are at 90 degrees to each other
Deviated by degrees. This cross-section reduction portion 23, 24 makes the shaft portion 16
Has a surface that is strong against axial tension, and therefore has high mechanical strength in the axial direction. On the other hand, the mechanical resistance in the radial direction is small due to the presence of the cross-section reduction portion. As the number of cross-section reductions increases, the axial mechanical strength does not change and the radial mobility of the shaft increases. Shaft
The 16 cross-section reductions may for example be formed as two side-by-side rows each having three notches. In that case, the notches in each row are spaced at an angle of 120 degrees, and the notches in the other rows are arranged at an angle of 60 degrees.

A particularly simple embodiment is shown in FIGS. 4 to 6, in which the shafts are provided with one notch 30, 31 in each row offset by 90 degrees in the circumferential direction. This results in an offset cross section 32. However, the drawback of this configuration is
The force is introduced eccentrically and there is a great risk of bending. On the other hand, in the embodiment shown in FIG. 1, the notch effect is slight. The larger the radius of curvature of the notch, the less the notch effect to avoid.

By forming the shafts 16, 16a as plastic injection parts, no additional or separate parts which are cumbersome to assemble in the casing are required. Therefore, disengagement of the connecting member after assembly no longer occurs. The shank can also be made of metallic wire or non-inductive material. If the shank is made of a metallic wire, the cylindrical projection 11 of the position sensor is made of a magnetically non-inductive material. The notches 23 and 24 may be manufactured by pushing deformation.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a view of the same embodiment rotated 90 degrees around its own axis, and FIG.
Fig. 4 is a sectional view taken along the line III-III of Fig. 4, Fig. 4 is a longitudinal sectional view of another embodiment of the present invention, and Fig. 5 is a sectional view of the same embodiment about its own axis.
FIG. 6 is a sectional view taken along line VI-VI in FIG. 5 when rotated 90 degrees. 10 …… Coupling member, 11 …… Projection part, 12 …… Brim, 13 …… Ferrite core, 16,16a …… Shaft part, 20 …… Coupling member, 23,2
4 …… Cross-section reduction part, 25 …… Cross-section, 30, 31 …… Notch

Claims (5)

[Scope of utility model registration request] 1. A coupling member between a mover of a magnet and a core of a position sensor, which is movable in a pressure tube, wherein one end of the coupling member is fixedly fastened to the mover of the magnet. And the other end of the coupling member having a core movable in the pressure pipe is arranged coaxially with the pressure pipe, and the coupling member has an elastic region, the elastic region, At least two transverse cross-section reduction portions (23, 24) formed in the axial direction of the coupling member and displaced from each other in the circumferential direction of the coupling member.
And a mechanical resistance of the core in the pressure pipe against radial bending force is small, the coupling member being characterized by being small. 2. Coupling element according to claim 1, characterized in that the cross-section reductions (23, 24) are formed as cutouts which are offset from each other by 90 ° in the circumferential direction of the coupling member. 3. Coupling element according to claim 1, characterized in that each cross-section reduction (23, 24) is formed as two notches provided on opposite sides of the coupling member. . 4. The method according to claim 1, wherein the connecting member is manufactured as an injection molded product.
The coupling member according to the item. 5. Coupling member, characterized in that it comprises a cylindrical projection (11) with a collar (12) for holding the ferrite core (13) of the position sensor.
The coupling member according to any one of items 1 to 4.