JP2013030706A

JP2013030706A - Solenoid

Info

Publication number: JP2013030706A
Application number: JP2011167602A
Authority: JP
Inventors: Koji Okazaki; 康治岡崎; Toshifumi Okude; 敏史奥出
Original assignee: Nachi Fujikoshi Corp
Current assignee: Nachi Fujikoshi Corp
Priority date: 2011-07-29
Filing date: 2011-07-29
Publication date: 2013-02-07
Anticipated expiration: 2031-07-29
Also published as: JP5874955B2

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid the durability of which can be ensured even if the welding method of a solenoid guide is changed from the Tig welding to the laser welding.SOLUTION: The solenoid 10 comprises: a fixed iron-core 11; a non-magnetic ring 12 welded to one end of the fixed iron-core 11; a solenoid guide 14 welded to the other end 13 of the non-magnetic ring 12; a lid 15 welded to the other end of the solenoid guide 14 or formed integrally therewith; and a plunger 16 incorporated movably in the axial direction while inscribing the solenoid guide 14 and the non-magnetic ring 12. Durability is ensured by thinning the thickness "t" at the flange of the fixed iron-core 11 and optimizing the groove depth "h" of the flange, thereby preventing concentration of stress on the weld zone.

Description

本発明は、産業機械等に使用される油圧電磁弁のソレノイドの改良に関する。 The present invention relates to an improvement in a solenoid of a hydraulic solenoid valve used in an industrial machine or the like.

従来、この種のソレノイドは、図６に示されるようなものであった。すなわち、ソレノイド３０は固定鉄心３１と、前記固定鉄心３１の一端の溶接された非磁性リング３２と、前記非磁性リング３２の他端４１（図６で左端）に溶接されたソレノイドガイド３３と、前記ソレノイドガイド３３の他端に溶接又は一体的に形成されたふた３４と、前記ソレノイドガイド３３及び非磁性リング３２に内接して軸方向に移動可能に内蔵されたプランジャ３５、及びソレノイドガイド３３及び非磁性リング３２に嵌合された図示しないソレノイドコイルを有し、固定鉄心３１と非磁性リング３２との溶接部３６は、固定鉄心３１の外周に非磁性リング３２を嵌合する小径部３７が形成され、小径部３７外周に非磁性リング３２を嵌合した後に溶接していた。 Conventionally, this type of solenoid is as shown in FIG. That is, the solenoid 30 includes a fixed iron core 31, a nonmagnetic ring 32 welded at one end of the fixed iron core 31, a solenoid guide 33 welded to the other end 41 (left end in FIG. 6) of the nonmagnetic ring 32, A lid 34 welded or integrally formed at the other end of the solenoid guide 33, a plunger 35 inscribed in the solenoid guide 33 and the nonmagnetic ring 32 so as to be movable in the axial direction, and a solenoid guide 33, A welding portion 36 between the fixed iron core 31 and the nonmagnetic ring 32 has a solenoid coil (not shown) fitted to the nonmagnetic ring 32, and a small diameter portion 37 that fits the nonmagnetic ring 32 to the outer periphery of the fixed iron core 31. It was formed and welded after fitting the non-magnetic ring 32 to the outer periphery of the small diameter portion 37.

係る構造のソレノイド３０は、固定鉄心３１と非磁性リング３２との溶接部３６は、該溶接部３６に隣接した非磁性リング側固定鉄心３１の外周に幅広周溝３８と、溶接部３６に隣接した非磁性リング３２内側の固定鉄心３１の小径部３７外周に幅狭周溝３９と、が形成されかつ固定鉄心３１と非磁性リング３２とが溶接された溶接部分４０とを有する。
溶接部分４０は隣接する部位に幅広周溝３８を設けて溶接、例えばTig溶接を使用するもので、ソレノイドガイド及び非磁性リングを厚くすることなく、ソレノイドの強度を確保したものであった。（例えば、特許文献１参照。）。 In the solenoid 30 having such a structure, the welded portion 36 between the fixed iron core 31 and the nonmagnetic ring 32 is adjacent to the outer periphery of the nonmagnetic ring side fixed iron core 31 adjacent to the welded portion 36 and the welded portion 36. A narrow circumferential groove 39 is formed on the outer periphery of the small-diameter portion 37 of the fixed iron core 31 inside the nonmagnetic ring 32, and the welded portion 40 is welded to the fixed iron core 31 and the nonmagnetic ring 32.
The welded portion 40 is formed by providing a wide circumferential groove 38 at an adjacent portion and using welding, for example, Tig welding, and the strength of the solenoid is ensured without increasing the thickness of the solenoid guide and the nonmagnetic ring. (For example, refer to Patent Document 1).

特開平４−２２１８１１号公報Japanese Patent Laid-Open No. 4-221811

特許文献１に記載するソレノイド３０のTig溶接は、溶接部分４０への熱エネルギーが大きく、かつ溶接の出来具合のばらつきが大きくなる。そのため、溶接方法としてレーザ（ビーム）溶接を採用するトライをしたが、レーザ溶接では、Tig溶接と同程度の溶接部の溶け込みにはならず溶接幅が狭くなる。このため、ソレノイド３０に内圧が繰り返し作用したときに、図７に示すように固定鉄心３１のつば部厚さＸが厚いとソレノイドガイド３３に内圧が作用してもつば部に強度を有するため、溶接部分４０に応力が集中してクラックが発生のでソレノイドの繰り返し内圧がかかる事に対する耐久性が確保できなかった。
本発明は、係る課題を解決するためになされたもので、ソレノイドガイドの溶接方法をＴig溶接からレーザ溶接に変更しても耐久性が確保できるソレノイドを提供することを目的とする。 In the Tig welding of the solenoid 30 described in Patent Document 1, the heat energy to the welded portion 40 is large, and the variation of the welding performance is large. For this reason, a trial of adopting laser (beam) welding as a welding method was performed, but in laser welding, the welded portion is not melted to the same extent as Tig welding, and the welding width is narrowed. For this reason, when the internal pressure is repeatedly applied to the solenoid 30 and the collar portion thickness X of the fixed iron core 31 is thick as shown in FIG. Since stress is concentrated on the welded portion 40 and cracks are generated, the durability against repeated internal pressure of the solenoid cannot be secured.
The present invention has been made to solve such a problem, and an object of the present invention is to provide a solenoid that can ensure durability even when the welding method of the solenoid guide is changed from Tig welding to laser welding.

前記の課題を解決するため本発明は、
固定鉄心と、
前記固定鉄心の一端の溶接された非磁性リングと、
前記非磁性リングの他端に溶接されたソレノイドガイドと、
前記ソレノイドガイドの他端に溶接又は一体的に形成されたふたと、
前記ソレノイドガイド及び非磁性リングに内接して軸方向に移動可能に内蔵されたプランジャと、
を有するソレノイドについて、
前記固定鉄心のつば部の厚さを薄くし、該つば部の溝深さを最適にして応力が溶接部分に集中することを防止し耐久性を確保することを特徴する。 In order to solve the above problems, the present invention
A fixed iron core,
A non-magnetic ring welded to one end of the fixed iron core;
A solenoid guide welded to the other end of the non-magnetic ring;
A lid welded or integrally formed at the other end of the solenoid guide;
A plunger built in the solenoid guide and the non-magnetic ring so as to be movable in the axial direction;
For solenoids with
The thickness of the collar portion of the fixed iron core is reduced, the groove depth of the collar portion is optimized, stress is prevented from concentrating on the welded portion, and durability is ensured.

本発明は固定鉄心のつば部の厚さを薄くし、該つば部の溝深さを最適にして応力が溶接部分に集中しなくなる部品形状でレーザ溶接をすることにより、耐久性を確保しながら溶接に必要なエネルギーを抑制し、かつ溶接のばらつきも少なく品質が向上する。 The present invention reduces the thickness of the collar portion of the fixed iron core, optimizes the groove depth of the collar portion, and performs laser welding with a component shape that does not concentrate stress on the welded portion, while ensuring durability. The energy required for welding is suppressed and quality is improved with little welding variation.

本発明の実施の形態に係るソレノイドのソレノイドコイルを除いた略縦断面図である。It is a substantially longitudinal cross-sectional view except the solenoid coil of the solenoid which concerns on embodiment of this invention. 図１のＣ部の拡大断面図である。It is an expanded sectional view of the C section of FIG. つば部に溶接箇所を２箇所にしたＣ部の変形例を示す拡大断面図である。It is an expanded sectional view which shows the modification of the C part which made the weld part two places in the collar part. 図１の溝の変形例を示す拡大断面図である。It is an expanded sectional view which shows the modification of the groove | channel of FIG. 図１のつば部の変形例を示す拡大断面図である。It is an expanded sectional view which shows the modification of the collar part of FIG. 従来のソレノイドの概略構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows schematic structure of the conventional solenoid. 図１の溶接部の拡大断面図である。It is an expanded sectional view of the welding part of FIG. 溶接時にソレノイドガイドの内圧が作用した際のつば部の変形状態を分かり易いように変形量を拡大して記載した説明図である。It is explanatory drawing which expanded and described the deformation amount so that the deformation | transformation state of the collar part at the time of the internal pressure of a solenoid guide acting at the time of welding may be understood easily.

本発明の実施の形態に係るソレノイドについて図面により詳細に説明する。図１は本発明の実施の形態に係るソレノイド１０の概略構造を示す縦断面図である。
図１に示すように、ソレノイド１０は固定鉄心１１と、前記固定鉄心１１の一端の溶接された非磁性リング１２と、前記非磁性リング１２の他端１３（図１で左端）に溶接されたソレノイドガイド１４と、前記ソレノイドガイド１４の他端に溶接または一体的に形成されたふた１５と、前記ソレノイドガイド１４及び非磁性リング１２に内接して軸方向に移動可能に内蔵されたプランジャ１６と、備える。 A solenoid according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic structure of a solenoid 10 according to an embodiment of the present invention.
As shown in FIG. 1, a solenoid 10 is welded to a fixed iron core 11, a nonmagnetic ring 12 welded at one end of the fixed iron core 11, and the other end 13 (left end in FIG. 1) of the nonmagnetic ring 12. A solenoid guide 14, a lid 15 welded or integrally formed at the other end of the solenoid guide 14, and a plunger 16 inscribed in the solenoid guide 14 and the nonmagnetic ring 12 so as to be movable in the axial direction. Prepare.

そして、ソレノイドガイド１４及び非磁性リング１２に図示しないソレノイドコイルが嵌合される。参照符号１７はふた１５に摺動自在に支持された押出しピンであり、参照符号１８はプランジャ１６の一体的に取り付けられたプッシュロッドで、固定鉄心１１に摺動自在に支持されている。参照符号２０はスペーサである。 A solenoid coil (not shown) is fitted to the solenoid guide 14 and the nonmagnetic ring 12. Reference numeral 17 is an extruding pin that is slidably supported by the lid 15, and reference numeral 18 is a push rod that is integrally attached to the plunger 16, and is slidably supported by the fixed iron core 11. Reference numeral 20 is a spacer.

本発明では、図２に示すように固定鉄心１１のつば部４３の厚さ「x」は、非磁性リング１２の厚さ「ｔ」との比は１：１が好ましく、また溝４４の深さ「ｈ」は、非磁性リング１２と厚さ「ｔ」に対し、「（０．９×ｔ）〜ｔ」が好ましい。
本発明によれば図８に示すように、固定鉄心３１のつば部が点線のように変形し、応力が溶接部に集中を排除し耐久性を確保することができる。 In the present invention, as shown in FIG. 2, the thickness “x” of the flange portion 43 of the fixed iron core 11 is preferably 1: 1 with the thickness “t” of the nonmagnetic ring 12, and the depth of the groove 44 The length “h” is preferably “(0.9 × t) to t” with respect to the nonmagnetic ring 12 and the thickness “t”.
According to the present invention, as shown in FIG. 8, the flange portion of the fixed iron core 31 is deformed as indicated by a dotted line, and stress can be concentrated on the welded portion to ensure durability.

本実施の形態に係るソレノイド１０では、図３に示すように溶接箇所を２箇所してもよい。
また、図４に示すように溝４５は断面矩形状にしてもよく、図５に示すようにつば部４３の厚さの略半分程度の面取りを施しても耐久性に問題がないことも確認済みである。 In the solenoid 10 according to the present embodiment, two welding locations may be provided as shown in FIG.
Further, as shown in FIG. 4, the groove 45 may have a rectangular cross section, and it is confirmed that there is no problem in durability even if chamfering about half the thickness of the collar portion 43 is performed as shown in FIG. It is done.

１０ソレノイド１１固定鉄心
１２非磁性リング１３他端
１４ソレノイドガイド１５ふた
１６プランジャ１７押しピン
１８プッシュロッド１９溶接部

DESCRIPTION OF SYMBOLS 10 Solenoid 11 Fixed iron core 12 Nonmagnetic ring 13 Other end 14 Solenoid guide 15 Lid 16 Plunger 17 Push pin 18 Push rod 19 Welding part

Claims

A fixed iron core,
A non-magnetic ring welded to one end of the fixed iron core;
A solenoid guide welded to the other end of the non-magnetic ring;
A lid welded or integrally formed at the other end of the solenoid guide;
A plunger built in the solenoid guide and the non-magnetic ring so as to be movable in the axial direction;
For solenoids with
A solenoid characterized by reducing the thickness of the flange portion of the fixed iron core, optimizing the groove depth of the flange portion, preventing stress from concentrating on the welded portion, and ensuring durability.